Single battery

Abstract

The utility model discloses a single battery, which relates to the technical field of batteries and comprises a core bag and a battery membrane wrapped outside the core bag. A positive cover plate and a negative cover plate are arranged at two ends of the core package and the battery membrane, two ends of the core package are connected with a first tab and a second tab, one surface of the first tab is directly welded with the positive cover plate, and the other surface of the first tab is in contact connection with the end surface of the core package through bending; one surface of the second tab is directly welded and connected with the cathode cover plate, and the other surface of the second tab is connected or close to the end surface of the core cladding through bending. According to the utility model, the cover plate is directly welded on the tab, so that the problems of high production cost and complex process are solved.

Description

Technical Field

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

[0002] Traditionally, there are two mainstream approaches to assembling power batteries. One involves hot pressing, followed by ultrasonic welding of the tabs to the flexible connector, then welding the flexible connector to the cover, followed by film wrapping, inserting the battery into the case, and sealing. The other involves hot pressing, followed by ultrasonic welding of the tabs to the cover, then laser welding, followed by film wrapping, inserting the battery into the case, and sealing. Currently, both of these approaches require extensive equipment, are costly, and involve complex processes with high defect rates. Utility Model Content

[0003] The present invention addresses the shortcomings of the prior art and provides a single battery. The present invention solves these shortcomings through the following technical solutions:

[0004] A single battery comprises the following structure:

[0005] shell,

[0006] Core package, the core package is placed in the shell;

[0007] The positive electrode cover plate and the negative electrode cover plate are respectively covered at both ends of the core package and the shell;

[0008] There are a first pole ear and a second pole ear at both ends of the core package. One side of the first pole ear is directly welded to the positive electrode cover plate, and the other side of the first pole ear is connected to the end face of the core package by bending; one side of the second pole ear is directly welded to the negative electrode cover plate, and the other side of the second pole ear is connected to or close to the end face of the core package by bending.

[0009] Preferably, the single battery cell further includes an insulating adhesive tape that covers at least the end face of the core package and the bend of the tab. More preferably, the insulating adhesive tape includes a first adhesive tape and a second adhesive tape, wherein the first adhesive tape is divided into three parts, the first part extending deep into the battery membrane, the second part on the end face of the core package, and the third part on the inner side of the tab, wherein the second and third parts pass through the bend of the tab; the second adhesive tape is attached in parallel with the first adhesive tape, wherein the third part of the second adhesive tape is shorter than the third part of the first adhesive tape, so as to avoid the welding area between the tab and the cover plate.

[0010] Preferably, the positive electrode cover plate includes: a top cover, a lower plastic part, a liquid injection hole, a first tab welding area, a positive electrode post, plastic under the post, an explosion-proof valve and a reserved position for a sealing top cap.

[0011] Preferably, the negative electrode cover plate includes: a top cover, a lower plastic part, a negative electrode post, plastic under the post, and a second tab welding area.

[0012] Preferably, short side steps are provided on the inner sides of the two ports of the shell, and the short side steps cooperate with the positive electrode cover plate and the negative electrode cover plate.

[0013] Preferably, the inner corners of the shell are provided with chamfered structures.

[0014] Preferably, the core package includes a battery core and a battery film wrapped around the outside of the battery core, and the battery film is fixed by film adhesive.

[0015] The utility model solves the problems of high production cost and complicated process by directly welding the cover plate to the structure of the pole ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 It is a schematic diagram of the structure of the pack and shell of a single battery;

[0018] Figure 2 It is a schematic diagram of the core package structure with film coating and glue application;

[0019] Figure 3 This is a schematic diagram of another core package structure with film and glue coating;

[0020] Figure 4 This is a schematic diagram of the structure of the battery cover before pressure welding;

[0021] Figure 5 It is a schematic diagram of the structure of the battery cover being press-welded to the tab;

[0022] Figure 6 It is a schematic diagram of the assembled single battery structure;

[0023] Figure 7 Schematic diagram of the positive electrode cover structure;

[0024] Figure 8 2. Schematic diagram of the negative electrode cover structure;

[0025] Figure 9 This is a diagram of the internal structure of the battery shell. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the embodiments. The following embodiments are intended to explain the present invention, but the present invention is not limited to the following embodiments.

[0027] A single battery, reference Figures 1-9 , including the following structure:

[0028] Housing 20,

[0029] The core package 30 is placed in the shell;

[0030] The positive electrode cover plate and the negative electrode cover plate are respectively covered at both ends of the core package and the shell;

[0031] There are pole ears 10 at both ends of the core package, including a first pole ear and a second pole ear. One side of the first pole ear is directly welded to the positive electrode cover plate, and the other side of the first pole ear is connected to the end face of the core package by bending; one side of the second pole ear is directly welded to the negative electrode cover plate, and the other side of the second pole ear is connected to or close to the end face of the core package by bending.

[0032] The single cell battery proposed in the application is a full-pole tab battery, which adopts a connection structure in which the tab and the cover plate are directly welded, making it simpler than the traditional structure, the assembly process more streamlined, and the required assembly equipment reduced, thereby improving the production line utilization rate and saving labor costs.

[0033] The core package includes a battery cell and a battery film 130 wrapped around the outside of the battery cell, and the battery film is fixed by a film adhesive 120. Figure 2 shown.

[0034] As a preferred embodiment, the single cell also includes an insulating adhesive tape that covers at least the end faces of the core package and the tab bend. This feature prevents welding slag from entering the core package, prevents the tab head from being inserted into the core package when the tab folds inward, and prevents the tab head and base from shorting together due to folding, thereby increasing the internal resistance of the battery cell. Optionally, the insulating adhesive tape is made of PVC or PET.

[0035] As a preferred solution, Figure 3-Figure 5 As shown in the reference, the insulating adhesive includes a first adhesive 140 and a second adhesive 150. The first adhesive 140 is divided into three parts. The first part penetrates into the battery membrane, the second part is on the end face of the core package, and the third part is on the inner side of the tab. The second and third parts pass through the bending position of the tab. The second adhesive 150 is attached in parallel with the first adhesive, and the third part of the second adhesive is shorter than the third part of the first adhesive, so as to avoid the welding area between the tab and the cover plate.

[0036] like Figure 7 It is the positive electrode cover: the left side is the back of the cover and the right side is the front of the cover. The positive electrode cover includes: top cover 90-1 (cover body), lower plastic part 50-1, injection hole 60, first tab welding area 70-1, positive electrode post 100, plastic 201-1 under the post, explosion-proof valve 101 and sealing top cap reserved position 110.

[0037] like Figure 8 This is a schematic diagram of the negative electrode cover. The left side is the back of the cover and the right side is the front of the cover. The negative electrode cover includes: a top cover 90-2 (cover body), a lower plastic part 50-2, a negative electrode post 200, a plastic under the post 201-2 and a second tab welding area 70-2.

[0038] As a preferred solution, Figure 9 (a) and (c), the inner sides of the two ports of the housing are provided with short side steps 220, and the short side steps 330 are matched with the positive and negative electrode covers. The design of the short side steps 220 makes it easier for the covers to be matched and installed together with the housing.

[0039] As a preferred solution, Figure 9 (b) The inner corner of the housing is provided with a chamfer 230. This can enhance the strength and service life of the housing. The housing is an integrally formed structure.

[0040] A single-cell battery manufacturing process is further proposed. After hot pressing and forming, the battery cell is directly coated and glued before being placed in the shell. After placement in the shell, the battery tabs are directly welded to the cover plate using pressure fusion welding. The tabs are then bent to mate the cover plate with the shell, and then laser welding is used to complete the sealing. The tabs include a first tab and a second tab, and the cover plate includes a first cover plate and a second cover plate.

[0041] refer to Figures 1-6 , specifically including the following steps:

[0042] (1) Wrap the hot-pressed core package 30 with Mylar film 130 and secure it by applying adhesive 120 to the junction of the Mylar film 130. The first and second tabs are now exposed. Alternatively, a casing may be prepared and the core package placed within the casing, exposing the tabs.

[0043] (2) The first and second tabs of the core package after coating are shaped, and the roots of the first and second tabs are glued.

[0044] (3) Place the core package 10 with the film and glue attached into the shell 20.

[0045] (4) Place the welding area 70 under the tab 10 and weld the tab 10 and the cover plate 40 together by pressure fusion welding. Figure 5 The pressure fusion welding point 80;

[0046] (5) Figure 5 As shown, the tabs after pressure melting are folded inwards so that the cover plate 40 and the shell 20 are matched together for sealing. Figure 6 shown.

[0047] Furthermore, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may vary. Any equivalent or simple variations based on the structure, features, and principles described in this utility model are included within the scope of protection of this utility model. Those skilled in the art of this utility model may make various modifications, additions, or substitutions to the described specific embodiments, and these modifications, as long as they do not deviate from the structure of this utility model or exceed the scope defined by these claims, shall fall within the scope of protection of this utility model.

Claims

1. A single cell battery, characterized in that: Includes the following structure: shell, A core package, the core package is placed in the outer shell; A positive electrode cover plate and a negative electrode cover plate, the positive electrode cover plate and the negative electrode cover plate are respectively covered at both ends of the core package and the shell; There are a first pole ear and a second pole ear at both ends of the core package. One side of the first pole ear is directly welded to the positive electrode cover plate, and the other side of the first pole ear is connected to the end face of the core package by bending; one side of the second pole ear is directly welded to the negative electrode cover plate, and the other side of the second pole ear is connected to or close to the end face of the core package by bending.

2. The single cell according to claim 1, characterized in that: The single cell also includes an insulating adhesive, which at least covers the end surface of the core package and the bending position of the pole ear.

3. The single cell according to claim 1, characterized in that: The positive electrode cover plate comprises: a top cover, a lower plastic part, a liquid injection hole, a first pole ear welding area, a positive pole, a pole lower plastic, an explosion-proof valve and a sealing top cap reserved position.

4. The single cell according to claim 1, characterized in that: The negative electrode cover plate comprises: a top cover, a lower plastic part, a negative electrode pole, plastic under the pole and a second pole lug welding area.

5. The single cell according to claim 1, characterized in that: The inner sides of the two ends of the shell are provided with short side steps, and the short side steps are matched with the positive electrode cover plate and the negative electrode cover plate.

6. The single cell according to claim 1, characterized in that: The inner corner of the shell is provided with a chamfer structure.

7. The single cell according to claim 1, characterized in that: The core package includes a battery core and a battery film wrapped outside the battery core, and the battery film is fixed by film adhesive.

8. The single cell according to claim 2, characterized in that: The insulating adhesive tape includes a first adhesive tape and a second adhesive tape, wherein the first adhesive tape is divided into three parts, wherein the first part penetrates into the battery membrane, the second part is on the end face of the core package, and the third part is on the inner side face of the pole ear, wherein the second part and the third part pass through the bending position of the pole ear; the second adhesive tape is attached in parallel with the first adhesive tape, wherein the third part of the second adhesive tape is shorter than the third part of the first adhesive tape, and is used to avoid the welding area between the pole ear and the cover plate.

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