Detachable polymer lithium ion battery cell with bent welding tabs

Abstract

The utility model discloses a detachable polymer lithium ion battery cell with bent welding tabs, which comprises a battery cell body, two tabs respectively extend out of two ends of the battery cell body, and the tabs are positive and negative tabs; the conductive end covers are arranged on the two sides of the battery cell body in a positive and negative pole mode and serve as conductive parts on the two sides of the battery cell body; each conductive end cover is provided with an open slot, and the tab pieces penetrate through the open slots, extend out of the conductive end covers and then are bent to form electrode tabs. According to the utility model, the detachable connection of the battery cell end cover is realized through the bending and welding mode of the tab pieces, so that the cylindrical polymer lithium ion battery cell can be replaced and maintained like a common battery, and a new technical means is provided for efficient utilization and recovery of the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lithium ion electric core, concretely relates to a detachable polymer lithium ion electric core with bent and welded tab. BACKGROUND

[0002] Polymer lithium ion batteries are widely used in consumer electronics, energy storage devices and power batteries due to their high energy density, lightweight design and flexible and diverse appearance structure. Among them, cylindrical polymer lithium ion electric core has become one of the important battery forms in the market due to its high standardization, good consistency and mechanical strength. However, the existing cylindrical polymer lithium ion electric core structure usually adopts a non-detachable packaging method, mainly in the following aspects:

[0003] In the prior art, the tab of the cylindrical polymer lithium ion electric core is usually fixed directly with the end cover by welding or riveting, and is externally covered with an aluminum plastic film or a metal shell to form a closed structure. This way makes it impossible to replace or disassemble the electric core once it is packaged, limiting subsequent maintenance and recycling;

[0004] In the existing cylindrical polymer lithium ion electric core, the packaging of the electric core generally adopts a heat sealing or laser welding process to ensure that the electric core is not affected by the external environment during use. However, this packaging method also makes it difficult to disassemble the electric core, which is not conducive to the repair, replacement and recycling of single electric core, especially in the battery pack application scenario, the cost of replacing the battery unit as a whole is high. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model provides a detachable polymer lithium ion electric core with bent and welded tab, the tab sheet of the electric core passes through the opening slot of the conductive end cover, and is bent after the outside of the end cover and welded, thereby forming a detachable electrode connection structure.

[0006] The utility model is realized through the following technical schemes: a detachable polymer lithium ion electric core with bent and welded tab, comprising:

[0007] An electric core body, one tab sheet is extended from each end of the electric core body, and the tab sheet is a positive or negative tab sheet;

[0008] A conductive end cover is arranged on both sides of the electric core body as a conductive part of both sides of the electric core body;

[0009] An opening slot is arranged on each conductive end cover, the tab sheet passes through the opening slot and is bent to form an electrode tab after being extended to the outside of the conductive end cover.

[0010] As a preferred technical scheme, the tab piece passes through the opening slot and is welded and fixed with the conductive end cover.

[0011] As a preferred technical scheme, the conductive end cover is provided with an assembly cavity on one side relative to the battery body, and the battery body is positioned and installed in the assembly cavity.

[0012] As a preferred technical scheme, when the conductive end cover is installed on both sides of the battery body, a thermoplastic film layer is wrapped outside the conductive end cover and the battery body.

[0013] As a preferred technical scheme, high-temperature glue is attached to the outside of the battery body.

[0014] The utility model discloses the beneficial effect is: the utility model discloses the bending welding mode of tab piece has realized the detachable connection of battery end cover, makes cylindrical polymer lithium ion battery can be changed and maintained like ordinary battery, provides new technical means for the efficient use and recycling of battery. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0016] Figure 1 It is the explosion structure schematic view of the utility model;

[0017] Figure 2 It is the overall assembly schematic view of the utility model;

[0018] Mark explanation:

[0019] 2, battery body;4, tab piece;5, conductive end cover;3, opening slot;1, thermoplastic film layer. DETAILED DESCRIPTION

[0020] All features disclosed in this specification, or the steps of any method or process disclosed, can be combined in any manner, except where features or steps are mutually exclusive.

[0021] Any feature disclosed in this specification, unless stated otherwise, can be replaced by an alternative feature serving the same, or a similar, purpose. That is, except where expressly stated to the contrary, any feature disclosed in this specification is an example of a generic series of equivalent or similar features.

[0022] As Figure 1 andFigure 2 The utility model provides a detachable polymer lithium ion electric core with bending and welding tab, including electric core body 2, conductive end cover 5, tab sheet 4, open slot 3, assembly cavity, thermoplastic film layer 1 and high temperature glue.

[0023] The electric core body 2 is of cylindrical structure, and internally contains positive and negative tab sheets, electrolyte and diaphragm, etc. to constitute basic elements of lithium ion electric core. The electric core body 2 has one tab sheet 4 extended from each end, wherein one end is positive tab sheet 4, and the other end is negative tab sheet 4.

[0024] The tab sheet 4 is made of high-conductivity material to ensure efficient current transmission performance and has certain mechanical strength to adapt to bending and welding operation.

[0025] The conductive end cover 5 is arranged on both sides of the electric core body 2 and is divided into positive and negative end covers according to polarity. In order to distinguish positive and negative electrodes conveniently, different color conductive end covers can be selected, such as Figure 2 The main function of the conductive end cover 5 is to serve as a conductive part of the electric core to realize connection of the electric core body 2 and external circuit and play a certain physical protection role.

[0026] Each conductive end cover 5 is provided with an open slot 3, and the open slot 3 is used for passing of the tab sheet 4 and provides space for bending and welding of the tab sheet 4 outside the end cover.

[0027] The size and shape of the open slot 3 are optimized to ensure that the tab sheet 4 can pass stably and form good electrical connection with the conductive end cover 5 after bending.

[0028] During installation, the electric core body 2 is first placed in the assembly cavity of the conductive end cover 5, and the tab sheets 4 at both ends pass through the open slots 3 on the conductive end cover 5.

[0029] The size of the assembly cavity matches the electric core body 2 to realize stable installation and prevent displacement of the electric core body 2 in the end cover. Then, the tab sheets 4 passing through the open slots 3 are bent to form a fitting structure outside the conductive end cover 5, and the tab sheets 4 after bending are fixed on the outer surface of the conductive end cover 5 by welding process.

[0030] The welding method can be ultrasonic welding, laser welding or resistance welding to ensure stability and long-term reliability of electrical connection.

[0031] When the conductive end cover 5 is installed on both sides of the battery body 2 and the bending welding of the tab sheet 4 is completed, in order to further enhance the sealing and mechanical strength of the battery, a layer of thermoplastic film layer 1 is wrapped outside the conductive end cover 5 and the battery body 2. The thermoplastic film layer 1 can use high-temperature heat-shrinkable material, which can shrink and fit on the surface of the battery after heating, improve the overall structural stability, and to some extent prevent the influence of the external environment on the battery, such as moisture intrusion, mechanical impact, etc.

[0032] In addition, in order to further improve the high-temperature resistance and insulation effect of the battery, high-temperature glue is attached to the outside of the battery body 2. The high-temperature glue can use materials with good heat resistance, such as polyimide tape or high-temperature resistant insulation paint, to effectively reduce the performance degradation of the battery due to high-temperature environment during operation, and prevent internal short circuit risk of the battery.

[0033] The utility model discloses a bending welding mode of tab sheet 4 is optimized, and the conductive end cover 5 can be detachably connected with the battery body 2. Compared with the traditional non-detachable structure, this design makes the cylindrical polymer lithium ion battery can be replaced and maintained like ordinary battery, thereby reducing the use cost of the battery, and improving the recyclability and recycling rate of the battery.

[0034] When the battery is damaged, the new battery body 2 can be directly replaced by disassembling the conductive end cover 5, without replacing the entire battery assembly, thereby improving the maintainability and economy of the battery system.

[0035] In addition, the design scheme is suitable for various battery assembly scenes, and can be used for independent use of single battery and integrated into modular battery pack, to provide a more convenient battery replacement scheme for energy storage systems, electric tools and consumer electronic products.

[0036] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any change or replacement without creative labor is covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be limited by the protection scope defined in the claims.

Claims

1. A detachable polymer lithium-ion battery cell with bent and welded tabs, characterized in that, include: The battery cell body (2) has a tab (4) extending from each end of the battery cell body (2), and the tab (4) is a positive and a negative tab (4); The conductive end caps (5) are arranged on both sides of the battery cell body (2) with positive and negative poles respectively, serving as conductive components on both sides of the battery cell body (2). Each of the conductive end caps (5) is provided with an opening groove (3), and the electrode tab (4) passes through the opening groove (3) and extends to the outside of the conductive end cap (5) before being bent to form an electrode tab.

2. The detachable polymer lithium-ion battery cell with bent welded tabs according to claim 1, characterized in that: The tab (4) passes through the opening groove (3) and is welded and fixed to the conductive end cap (5).

3. The detachable polymer lithium-ion battery cell with bent welded tabs according to claim 1, characterized in that: The conductive end cap (5) has an assembly cavity on the side opposite to the battery cell body (2), and the battery cell body (2) is positioned and installed in the assembly cavity.

4. The detachable polymer lithium-ion battery cell with bent welded tabs according to claim 1, characterized in that: When the conductive end cap (5) is installed on both sides of the battery cell body (2), a thermoplastic film layer (1) is wrapped around the conductive end cap (5) and the battery cell body (2).

5. The detachable polymer lithium-ion battery cell with bent welded tabs according to claim 1, characterized in that: The external surface of the battery cell body (2) is covered with high-temperature adhesive.

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