Novel battery cell

Abstract

The utility model relates to a novel battery cell, which comprises a roll core, a first shell, a second shell, a first cover plate, a second cover plate and an insulating piece, one end of the first shell extends into the inner side of the second shell to form a first overlapping part, and the part of the second shell opposite to the first overlapping part forms a second overlapping part. The insulating part is clamped between the first overlapping part and the second overlapping part, the first cover plate and the second cover plate are respectively welded with the first shell and the second shell, the roll core is arranged between the first cover plate and the second cover plate, and two poles of the roll core are respectively and electrically connected with the first cover plate and the second cover plate. The structure is reasonable, the insulating part can be far away from the welding position while the battery core is sealed and the positive and negative electrodes are insulated, so that the structure of the insulating part is prevented from being influenced by high temperature of welding, the safety of the battery core is ensured, the explosion-proof function is realized, an additional explosion-proof structure is not needed, and the production cost is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, specifically, relate to a novel electric core. BACKGROUND

[0002] The steel shell of the existing electric core is generally a columnar shape with one end being open, a cap is welded to the open end of the steel shell, a roll core is arranged in the steel shell and connected with the steel shell at the negative electrode, and insulation is achieved between the positive electrode and the steel shell through an insulating piece. The insulating piece of this structure is usually arranged at the open end of the steel shell and close to the welding position of the cap and the steel shell. High temperature generated during welding can easily melt or deform the insulation layer, resulting in a risk of liquid leakage of the electric core. In addition, the existing electric core does not have an explosion-proof function and needs to be additionally provided with an explosion-proof structure such as a groove in the steel shell or the cap to achieve explosion-proof, resulting in an increase in cost. SUMMARY

[0003] The utility model aims at providing a novel electric core, which has a reasonable structure, can keep the electric core sealed and the positive and negative electrodes insulated while keeping the insulating piece away from the welding position, thereby avoiding the influence of high temperature during welding on the structure of the insulating piece and ensuring the safety of the electric core, and has an explosion-proof function without the need for additional explosion-proof structure, effectively reducing production cost.

[0004] A novel electric core, comprising a roll core, a first shell, a second shell, a first cover plate, a second cover plate, and an insulating piece, one end of the first shell extends into the inside of the second shell to form a first overlapping part, the part of the second shell opposite to the first overlapping part is formed into a second overlapping part, the insulating piece is arranged between the first overlapping part and the second overlapping part, the first cover plate and the second cover plate are respectively welded to the first shell and the second shell, the roll core is arranged between the first cover plate and the second cover plate, and the two poles of the roll core are respectively electrically connected with the first cover plate and the second cover plate.

[0005] In the technical scheme, the insulating piece is arranged between the first and second coinciding parts, which can keep the insulating piece away from the welding positions of the first cover plate and the first shell and the second cover plate and the second shell, thereby avoiding the influence of high temperature of welding on the structure of the insulating piece, and improving the safety and stability of the product. Since the insulating piece is arranged between the first and second shells, when high temperature is generated due to short circuit of the battery cell, the insulating layer can melt at high temperature, so that the gap between the first and second shells is exposed, and the sealing is failed, thereby realizing automatic pressure relief of the battery cell, without the need of additionally arranging an explosion-proof structure, effectively reducing the cost, and by adjusting the coinciding width of the first and second coinciding parts, the explosion-proof performance can be increased or reduced, and the explosion-proof pressure can be accurately controlled. The negative electrode of the winding core of the existing battery cell needs to be welded with the steel shell, and the welding position is located at the bottom of the steel shell, which is complex to operate and inconvenient to detect the welding quality. The first and second cover plates of the utility model are independent structures, which can facilitate welding of the two poles of the winding core with the first and second cover plates respectively, and the welding position is exposed, thereby facilitating detection of the welding quality.

[0006] Further, the width of the insulating piece is greater than or equal to the width of the first and second coinciding parts, and the insulating piece covers the outer circumferential surface of the first coinciding part and the inner circumferential surface of the second coinciding part.

[0007] In the technical scheme, the width of the insulating piece is greater than or equal to the width of the first and second coinciding parts, which can make the insulating piece completely cover the outer circumferential surface of the first coinciding part and the inner circumferential surface of the second coinciding part, so as to isolate the first and second shells from each other, thereby ensuring the insulation effect.

[0008] Further, the two sides of the insulating piece extend to the outside of the edges of the first and second coinciding parts to form extension parts.

[0009] In the technical scheme, the two sides of the insulating piece extend outward to form extension parts, which can further avoid contact between the first and second shells, and improve the insulation effect and stability.

[0010] Further, there is a distance between the insulating piece and the first cover plate and between the insulating piece and the second cover plate.

[0011] In the technical scheme, the insulating piece has a distance from the first and second cover plates, which can avoid the influence of high temperature of welding on the insulating piece, and ensure the stability and safety of the structure.

[0012] Further, the first and second shells are both in the shape of a cylinder with both ends open, the first and second shells are coaxial, and the diameter of the first shell is smaller than that of the second shell.

[0013] In the above technical solution, the first shell and the second shell are both in the shape of a cylinder with both ends open, and the diameter of the first shell is smaller than that of the second shell, so that the first shell can be inserted into the inside of the second shell, facilitating assembly.

[0014] Further, the insulation piece is annular, and the inner and outer circumferential surfaces of the insulation piece are in close contact with the first and second coincident parts, respectively.

[0015] In the above technical solution, the insulation piece is in close contact with the first and second coincident parts, so that the connection and sealing between the first shell and the second shell can be realized, and the first shell and the second shell are insulated.

[0016] Further, the first and / or second cover plate is provided with an anti-explosion line, which is formed as a groove recessed on the surface of the first and / or second cover plate.

[0017] In the above technical solution, by providing the anti-explosion line, the double anti-explosion of the product can be realized, and the safety performance of the product is further improved.

[0018] Further, the anti-explosion line is formed as an annular ring with an opening coaxial with the first or second cover plate.

[0019] In the above technical solution, the anti-explosion line can be more easily opened under pressure, ensuring the anti-explosion effect.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows: the insulation piece is clamped between the first and second coincident parts, so that the insulation piece is away from the welding positions of the first cover plate and the first shell, and the second cover plate and the second shell, thereby avoiding the influence of high temperature welding on the structure of the insulation piece, and improving the safety and stability of the product. Since the insulation piece is clamped between the first and second shells, when high temperature is generated due to short circuit of the electric core, the insulation layer can melt under high temperature, so that the gap between the first and second shells is exposed, and the sealing is failed, thereby realizing automatic pressure relief of the electric core, without the need of additionally setting an anti-explosion structure, effectively reducing the cost, and by adjusting the coincident width of the first and second coincident parts, the anti-explosion performance can be increased or decreased, and the anti-explosion pressure can be accurately controlled. The negative pole of the winding core of the existing electric core needs to be welded with the steel shell, and the welding position is located at the bottom of the steel shell, which is complex to operate and inconvenient to detect the welding quality. The first and second cover plates of the utility model are both independent structures, so that the two poles of the winding core can be conveniently welded with the first and second cover plates, respectively, and the welding position is exposed, facilitating detection of the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure of the novel electric core of the utility model embodiment is shown in the figure.

[0022] Figure 2 This is an exploded structural diagram of the novel battery cell according to an embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional structural diagram of the novel battery cell according to an embodiment of the present invention.

[0024] Figure 4 for Figure 3 A magnified view of part A in the diagram.

[0025] Figure 5 This is a schematic diagram of the structure of the first cover plate and the second cover plate before welding, according to an embodiment of the present utility model.

[0026] Explanation of icon numbers:

[0027] Core 1, first housing 2, first overlapping part 21, second housing 3, second overlapping part 31, first cover plate 4, second cover plate 5, insulating component 6, extension part 61, explosion-proof wire 7. Detailed Implementation

[0028] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0029] Please refer to Figures 1 to 4 In a preferred embodiment, the novel battery cell of this utility model mainly includes a core 1, a first housing 2, a second housing 3, a first cover plate 4, a second cover plate 5, and an insulating member 6. One end of the first housing 2 extends into the inner side of the second housing 3 to form a first overlapping portion 21. The portion of the second housing 3 opposite to the first overlapping portion 21 forms a second overlapping portion 31. The insulating member 6 is sandwiched between the first overlapping portion 21 and the second overlapping portion 31. The first cover plate 4 and the second cover plate 5 are welded to the first housing 2 and the second housing 3, respectively. The core 1 is disposed between the first cover plate 4 and the second cover plate 5, and the two poles of the core 1 are electrically connected to the first cover plate 4 and the second cover plate 5, respectively.

[0030] For example, the first housing 2, the second housing 3, the first cover plate 4, and the second cover plate 5 are all made of conductive metal, and the insulating member 6 is made of existing insulating material. In this embodiment, the first housing 2 and the second housing 3 are both cylindrical with open ends, and the insulating member 6 is correspondingly formed as an annular shape. In other possible embodiments, the first housing 2 and the second housing 3 may be cylindrical structures with open ends and other regular shapes such as square bottom surfaces, and the insulating member 6 is correspondingly formed as a regular annular shape. The first housing 2 and the second housing 3 are coaxial, and the diameter of the first housing 2 is smaller than the diameter of the second housing 3, so that one end of the first housing 2 can extend into the inside of the second housing 3. In specific assembly, the insulating member 6 can be sleeved on the outer periphery of the first overlapping part 21, and the first overlapping part 21 together with the insulating member 6 can be extended into the inside of the second housing 3. Then, the insulating member 6 can be melted between the first overlapping part 21 and the second overlapping part 31 by heating.

[0031] As can be seen from the above technical solution, the insulating component 6 is sandwiched between the first overlapping part 21 and the second overlapping part 31, which can keep the insulating component 6 away from the welding positions of the first cover plate 4 and the first housing 2, and the second cover plate 5 and the second housing 3, thereby avoiding the impact of the high temperature of welding on the structure of the insulating component 6 and improving the safety and stability of the product. Since the insulating component 6 is sandwiched between the first housing 2 and the second housing 3, when the battery cell is short-circuited and generates high temperature, the insulating layer can melt at high temperature, exposing the gap between the first housing 2 and the second housing 3, thereby causing the seal to fail and realizing automatic pressure relief of the battery cell. There is no need to set up an additional explosion-proof structure, which effectively reduces costs. Moreover, by adjusting the overlap width of the first overlapping part 21 and the second overlapping part 31, the explosion-proof performance can be increased or decreased, and the explosion-proof pressure can be precisely controlled.

[0032] It should be noted that in existing battery cells, the negative electrode of the core 1 needs to be welded to the steel shell. However, the existing steel shell is only open at one end, and the welding position is located at the bottom of the steel shell. Therefore, laser welding is required on the outside of the negative electrode, which is complicated and inconvenient for inspecting the welding quality. In addition, to ensure effective welding of the negative electrode, the diameter of the winding needle needs to be increased, resulting in a reduction in the capacity of the core 1. In this technical solution, the first cover plate 4 and the second cover plate 5 are both independent structures, which can facilitate the welding of the two electrodes of the core 1 to the first cover plate 4 and the second cover plate 5 respectively. At the same time, the welding position is exposed, which is convenient for inspecting the welding quality. Furthermore, due to the different welding methods used, the core 1 can be made with a smaller diameter winding needle, thereby increasing the capacity of the core 1 while keeping the battery cell size the same.

[0033] Since the two poles of the core 1 are connected to the first cover plate 4 and the second cover plate 5 respectively, and the first cover plate 4 and the second cover plate 5 are welded to the first housing 2 and the second housing 3 respectively, the first cover plate 4 and the first housing 2 can be used as one electrode of the battery cell as a whole, and the second cover plate 5 and the second housing 3 can be used as the other electrode of the battery cell as a whole, which effectively increases the area of ​​the battery cell that can be electrically connected to the outside and improves the flexibility of the battery cell.

[0034] In this embodiment, the width of the insulating member 6 is greater than or equal to the width of the first overlapping portion 21 and the second overlapping portion 31, and the insulating member 6 covers the outer peripheral surface of the first overlapping portion 21 and the inner peripheral surface of the second overlapping portion 31. The fact that the width of the insulating member 6 is greater than or equal to the width of the first overlapping portion 21 and the second overlapping portion 31 allows the insulating member 6 to completely cover the outer peripheral surface of the first overlapping portion 21 and the inner peripheral surface of the second overlapping portion 31, thus isolating the first housing 2 and the second housing 3 from each other and ensuring the insulation effect.

[0035] The insulating member 6 extends to the outer edges of the first overlapping portion 21 and the second overlapping portion 31 on both sides to form extension portions 61. By extending the insulating member 6 outward to form extension portions 61 on both sides, the first housing 2 and the second housing 3 can be further prevented from contacting each other, thereby improving the insulation effect and stability.

[0036] There are distances between the insulating component 6 and the first cover plate 4, as well as between the insulating component 6 and the second cover plate 5, which can prevent the insulating component 6 from being affected by the high temperature of welding and ensure the stability and safety of the structure.

[0037] The first cover plate 4 and / or the second cover plate 5 are provided with an explosion-proof line 7, which is formed as a groove recessed into the surface of the first cover plate 4 and / or the second cover plate 5. By providing the explosion-proof line 7, the product can achieve dual explosion protection, further improving the product's safety performance. In this embodiment, the explosion-proof line 7 is formed as an open annular shape coaxial with the first cover plate 4 or the second cover plate 5, which makes the explosion-proof line 7 easier to open under pressure, ensuring the explosion-proof effect.

[0038] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel battery cell, characterized in that, The device includes a core, a first housing, a second housing, a first cover plate, a second cover plate, and an insulating component. One end of the first housing extends into the inner side of the second housing to form a first overlapping portion. The portion of the second housing opposite to the first overlapping portion forms a second overlapping portion. The insulating component is sandwiched between the first overlapping portion and the second overlapping portion. The first cover plate and the second cover plate are welded to the first housing and the second housing, respectively. The core is disposed between the first cover plate and the second cover plate, and the two poles of the core are electrically connected to the first cover plate and the second cover plate, respectively.

2. The novel battery cell according to claim 1, characterized in that, The width of the insulating member is greater than or equal to the width of the first overlapping portion and the second overlapping portion, and the insulating member covers the outer peripheral surface of the first overlapping portion and the inner peripheral surface of the second overlapping portion.

3. The novel battery cell according to claim 2, characterized in that, The insulating element extends to the outer edges of the first overlapping portion and the second overlapping portion on both sides to form an extension portion.

4. The novel battery cell according to claim 1, characterized in that, There is a distance between the insulating component and the first cover plate, and between the insulating component and the second cover plate.

5. The novel battery cell according to claim 1, characterized in that, Both the first and second housings are cylindrical with openings at both ends. The first and second housings are coaxial, and the diameter of the first housing is smaller than the diameter of the second housing.

6. The novel battery cell according to claim 5, characterized in that, The insulating element is annular, and its inner and outer circumferential surfaces are in close contact with the first and second overlapping portions, respectively.

7. The novel battery cell according to claim 1, characterized in that, The first cover plate and / or the second cover plate are provided with explosion-proof lines, which are formed as grooves recessed into the surface of the first cover plate and / or the second cover plate.

8. The novel battery cell according to claim 7, characterized in that, The explosion-proof line is formed as an open ring coaxial with the first or second cover plate.

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