Cylindrical lithium battery

Abstract

The cylindrical lithium battery comprises a lithium battery main body, a shell and a top cover, the shell is arranged outside the lithium battery main body, the top end of the lithium battery main body is fixedly connected with the top cover, embedded openings are symmetrically formed in the shell, an internally inflated isolation air bag is clamped in the embedded openings, flame-retardant bags are arranged at the two ends of the isolation air bag, and the flame-retardant bags are arranged in the shell. One end, close to the lithium battery main body, of the isolation air bag is fixedly connected with a positioning heat-conducting fin, the positioning heat-conducting fin is attached to the outer wall of the lithium battery main body, and a plurality of heat dissipation notches are formed in the outer wall of the shell. The shell of the cylindrical lithium battery has the characteristic of small size, has good heat dissipation performance in daily use, can quickly improve the safety when being heated excessively, and is convenient to use safely and stably.

Description

Technical Field

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

[0002] Lithium battery is a battery that uses lithium metal or lithium alloy as negative electrode material and non-aqueous electrolyte solution. Cylindrical lithium battery is widely used due to its simple structure, light weight, high specific energy, low cost, low self-discharge, long life, and suitable for use in various equipment. For example, lithium-ion battery itself has a high power tolerance. The lithium-ion battery used in electric vehicles can achieve 15-30c efficient charge and discharge, thereby accelerating the high-intensity start of the car.

[0003] For example, a lithium battery with a protective shell is disclosed in a Chinese patent (publication number CN213584038U). Its technical solution is to provide a shell outside the body of the lithium battery to protect the lithium battery, and the protective block, shock-absorbing plate and multiple spring groups are used to shock-absorb the lithium battery, which can effectively protect the lithium battery installed in the shell from damage. However, in the above technical solution, the shell structure is too large, and the lithium batteries will be too closely fitted, which is not conducive to heat dissipation. At the same time, if any lithium battery is accidentally damaged, such as spontaneous combustion, it will quickly involve the surrounding lithium batteries, and the safety of use is insufficient. Utility Model Content

[0004] The purpose of the utility model is to provide a cylindrical lithium battery, which can solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A cylindrical lithium battery comprises a lithium battery body, an outer shell, and a top cover, wherein the outer shell is arranged outside the lithium battery body, the top of the lithium battery body is fixedly connected to the top cover, the outer shell is symmetrically provided with embedded openings, an internally inflated isolation airbag is clamped in the embedded openings, flame retardant bags are arranged at both ends of the isolation airbag, the isolation airbag is connected to the inside of the flame retardant bag, a positioning heat conductive sheet is fixedly connected to one end of the isolation airbag close to the lithium battery body, the positioning heat conductive sheet is in contact with the outer wall of the lithium battery body, and a plurality of heat dissipation recesses are opened on the outer wall of the outer shell.

[0007] Preferably, the width of the positioning heat-conducting plate is greater than the width of the embedding opening, the positioning heat-conducting plate is an arc-shaped structure, and the outer wall of the positioning heat-conducting plate is a frosted structure.

[0008] Preferably, the interior of the isolation airbag is filled with nitrogen, and the flame-retardant bag is a stacked pleated structure.

[0009] Preferably, the depth of the heat dissipation recess is less than the thickness of the housing, and the heat dissipation recess is a polygonal structure.

[0010] Preferably, the diameter of the top cover is larger than the caliber of the outer shell.

[0011] Preferably, a plurality of inner support bars are fixedly connected to the inner wall of the outer shell, and two adjacent inner support bars are equidistantly distributed, and the top ends of the inner support bars are in contact with the top cover.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1) The utility model can increase the heat dissipation area of ​​the lithium battery by providing a shell with heat dissipation recesses on its outer wall, and symmetrical isolation airbags and flame-retardant bags are provided on the shell. When the heat of the lithium battery body increases too much, the heat is transferred by positioning the heat conductive sheet to enable the gas in the isolation airbag to expand rapidly, so as to quickly inflate the flame-retardant bag and extend it to both sides, so as to utilize its flame-retardant properties to increase the safety protection of the surrounding lithium batteries.

[0014] 2) The shell of the lithium battery of the utility model has the characteristics of small volume, good heat dissipation in daily use, and can quickly improve its safety when overheated, facilitating safe and stable use;

[0015] 3) The utility model can cooperate with the top cover to form a stable structure through the synergistic effect of the outer shell and a plurality of inner support bars arranged in the outer shell, so as to effectively improve the supporting performance of the lithium battery when it is under pressure, so that it has good pressure resistance in daily use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a cylindrical lithium battery in the embodiment of the utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the housing in the embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the connection between the isolation airbag and the housing in the embodiment of the utility model;

[0019] Figure 4 The structure of a cylindrical lithium battery in the embodiment of the utility model is shown in FIG. Figure 2

[0020] In the figure, 1. lithium battery body, 2. outer shell, 3. top cover, 4. heat dissipation recess, 5. embedding, 6. isolation airbag, 7. flame retardant bag, 8. positioning thermal conductive sheet, 9. inner support bar. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3 A cylindrical lithium battery structure includes a lithium battery body 1, an outer shell 2 is provided on the outer wall of the lithium battery body 1, and two inlays 5 are provided on the outer wall of the outer shell 2, an isolation airbag 6 filled with nitrogen is clamped in the inlay 5, and flame retardant bags 7 are connected to both ends of the isolation airbag 6, and the flame retardant bag 7 is a stacked pleated structure, which is used to expand and extend to wrap the outer shell 2. The isolation airbag 6 and the flame retardant bag 7 are both made of high-temperature resistant elastic rubber, and the isolation airbag 6 and the flame retardant bag 7 are interconnected. When the nitrogen in the isolation airbag 6 expands due to heat, the structural design of the flame retardant bag 7 facilitates its expansion and extension to the side.

[0023] The isolation airbag 6 is fixedly connected to one end close to the lithium battery body 1 with a positioning heat conductive sheet 8, and the positioning heat conductive sheet 8 fits the outer wall of the lithium battery body 1. The width of the positioning heat conductive sheet 8 is greater than the width of the inlay 5, and the positioning heat conductive sheet 8 is designed in an arc-shaped structure, and the outer wall of the positioning heat conductive sheet 8 is designed in a frosted type. The positioning heat conductive sheet 8 is engaged with the inlay 5 to prevent the isolation airbag 6 from being separated. The frosted outer wall of the positioning heat conductive sheet 8 can fit tightly with the lithium battery body 1 to prevent sliding.

[0024] The outer wall of the shell 2 is provided with a plurality of heat dissipation recesses 4, and the depth of the heat dissipation recesses 4 is less than the thickness of the shell 2. The heat dissipation recesses 4 are of a polygonal structure. By setting the heat dissipation recesses 4 in conjunction with other structures, the heat dissipation of the shell 2 to the lithium battery body 1 can be increased, and the compression resistance of the structure can be ensured. In daily use, the heat dissipation recesses 4 are not covered by the isolation airbag 6 and the flame retardant bag 7, and will not affect the heat dissipation effect.

[0025] like Figure 4 As shown, a top cover 3 is fixedly connected to the top of the lithium battery body 1, and the diameter of the top cover 3 is larger than the caliber of the outer shell 2, and a plurality of inner support bars 9 are fixedly connected to the inner wall of the outer shell 2, and the distances between two adjacent inner support bars 9 are equidistant, and the tops of the inner support bars 9 are in contact with the top cover 3. By setting the top cover 3 to have a diameter larger than the lithium battery body 1, it can be offset against the outer shell 2 and the inner support bars 9, so that the lithium battery has good pressure resistance when under pressure, and the inner support bars 9 cooperate with the outer shell 2 to further increase the pressure resistance of the lithium battery.

[0026] Working principle: When in use, first fix the lithium battery body 1, the shell 2 and the top cover 3 together. When the lithium batteries are combined and connected in parallel to form a lithium battery pack for daily use, the multiple groups of cylindrical lithium batteries will not fit completely together, but will have a certain space gap, and the heat will be quickly dissipated through the shell 2 and the heat dissipation recess 4. The lithium batteries are in contact with each other through the isolation airbag 6. When the heat of the lithium battery body 1 is too high, the gas in the isolation airbag 6 can expand to allow the flame retardant bag 7 to extend, thereby preventing rapid damage to the lithium battery next door, providing convenience for emergency treatment.

[0027] The above contents are merely examples and explanations of the structure of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. A cylindrical lithium battery, comprising a lithium battery body, a shell, and a top cover, wherein the shell is arranged outside the lithium battery body, and the top of the lithium battery body is fixedly connected with the top cover, characterized in that: The shell is symmetrically provided with embedded openings, and an internally inflated isolation airbag is clamped in the embedded openings. Flame-retardant bags are provided at both ends of the isolation airbag, and the isolation airbag is connected to the inside of the flame-retardant bag. A positioning heat-conducting plate is fixedly connected to one end of the isolation airbag close to the lithium battery body, and the positioning heat-conducting plate is in contact with the outer wall of the lithium battery body. The outer wall of the shell is provided with a plurality of heat dissipation recesses.

2. A cylindrical lithium battery according to claim 1, characterized in that: The width of the positioning heat conductive sheet is greater than the width of the embedding opening, the positioning heat conductive sheet is an arc-shaped structure, and the outer wall of the positioning heat conductive sheet is a frosted structure.

3. A cylindrical lithium battery according to claim 1, characterized in that: The interior of the isolation airbag is filled with nitrogen, and the flame-retardant bag is a stacked pleated structure.

4. A cylindrical lithium battery according to claim 1, characterized in that: The depth of the heat dissipation recess is less than the thickness of the housing, and the heat dissipation recess is a polygonal structure.

5. A cylindrical lithium battery according to claim 1, characterized in that: The diameter of the top cover is greater than the caliber of the outer shell.

6. A cylindrical lithium battery according to claim 1, characterized in that: The inner wall of the shell is fixedly connected with a plurality of inner support bars, and the distances between two adjacent inner support bars are equidistant, and the top ends of the inner support bars are in contact with the top cover.

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