CN217158369U

CN217158369U - Battery cover group structure and battery

Info

Publication number: CN217158369U
Application number: CN202220319180.XU
Authority: CN
Inventors: 丁鹏冲; 尹昊; 卜芳; 祝媛; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-08-09
Anticipated expiration: 2032-02-17

Abstract

The utility model relates to a battery technology field discloses a battery cover group structure and battery, and battery cover group structure is including apron, electric core and clamping ring, welded connection between the outer wall of the inner ring wall of clamping ring and electric core. The welding mode eliminates contact impedance between different metals, can ensure the connection stability of the battery cell and the pressure ring, and improves the internal resistance consistency and the load capacity consistency of the battery cell. And the welding connection can prevent the pressure ring from shifting, avoid the deformation and the damage of the electric core, ensure the consistent appearance of the product, increase the overall aesthetic degree, and effectively reduce the product reject ratio in the production process of the battery, thereby reducing the production cost. Meanwhile, the internal resistance change of the battery cell and the compression ring caused by the difference of the expansion coefficients can be reduced by welding connection, the risk of the poor sealing performance of the battery cover group structure is reduced, and the battery cell can still keep better internal resistance consistency after being used for a long time. In addition, the welding process is simple, the operation speed is high, the battery product is more convenient to process, and the production efficiency can be improved.

Description

Battery cover group structure and battery

Technical Field

The utility model relates to a battery technology field especially relates to a battery cover group structure and battery.

Background

At present, in the existing battery cover group structure, a positive lug of a battery is connected with an electric core (such as an aluminum core), and the electric core and a pressure ring are fixedly connected through metal deformation. Usually the clamping ring is the aluminium material, when fixed clamping ring and electric core, thereby makes the clamping core that produces deformation with the help of external instrument with the help of the hookup location of clamping ring and electric core. However, the aluminum is soft, and if the press ring is under tension, the press ring is easily deformed to separate from the battery core, so that the structure of the battery cover assembly is damaged. That is to say, it is unstable to agree with fixed mode connection through metal deformation, and battery lid group structure damages easily, and the yields reduces when leading to battery production, and manufacturing cost risees. And the metal deformation is matched and fixed, so that the appearance of each battery cover group structure is different, and the appearance consistency and the aesthetic degree of the battery product are influenced.

In addition, if the electric core is the aluminium core and the clamping ring is stainless steel, because both materials are different, so both coefficients of thermal expansion are different. If the temperature of the environment where the battery is located changes, the connection position of the battery and the battery can change, which finally causes the internal resistance of the battery cell to change and even causes the sealing performance of the battery cell to deteriorate.

SUMMERY OF THE UTILITY MODEL

Based on the above problem, an object of the utility model is to provide a battery cover group structure and battery can guarantee the stability of being connected of electricity core and clamping ring, improves the internal resistance uniformity and the load capacity uniformity of electricity core, can guarantee the production quality of battery product simultaneously, reduction in production cost.

In order to achieve the purpose, the utility model adopts the following technical proposal:

on the one hand, the battery cover group structure comprises a cover plate, an electric core and a pressing ring, wherein the pressing ring is sleeved on the electric core and extends out of one end of the cover plate, and the joint of the pressing ring and the electric core is in welded connection.

As the utility model discloses a preferred scheme of battery cover group structure, the inner ring wall of clamping ring with welding mode between the outer wall of electric core is the fusion welding.

As the utility model discloses a preferred scheme of battery cover group structure, the clamping ring with be continuous welding or interval welding between the electricity core.

As the utility model discloses a preferred scheme of battery cover group structure, battery cover group structure still includes the insulating part, the insulating part cover is located on the electricity core.

As the utility model discloses a preferred scheme of battery cover group structure, the insulating part include insulation support and set up in the first insulating pad of insulation support one end, the insulation support presss from both sides to be located the outer wall of electric core with between the pore wall of mounting hole, first insulating pad presss from both sides to be located the clamping ring with between the top surface of apron.

As the utility model discloses a preferred scheme of battery cover group structure, keep away from on the insulation support the one end of first insulation pad is provided with the second insulation pad, be provided with backstop portion on the electric core, the second insulation pad presss from both sides and locates backstop portion with between the bottom surface of apron.

As the utility model discloses a preferred scheme of battery cover group structure, electric core with the clamping ring is formed by metal material preparation.

As a preferred embodiment of the battery cover assembly structure of the present invention, the battery core is made of aluminum material or stainless steel material.

As a preferable embodiment of the battery cover assembly structure of the present invention, the pressing ring is made of a stainless steel material, a carbon steel material, or an aluminum material.

In another aspect, a battery is also provided, which includes the battery cover assembly structure as described above.

The utility model has the advantages that:

the utility model provides a battery cover group structure and battery is connected the outer wall of electric core and the inner ring wall of clamping ring through the welded method, has eliminated the contact impedance between the different metals, can guarantee the stability of being connected of electric core and clamping ring, improves the internal resistance uniformity and the load capacity uniformity of electric core. Compare in prior art through the fixed mode of metal deformation agrees with, welded connection can prevent that the clamping ring from shifting, avoids electric core deformation to damage, can guarantee that the outward appearance of product is unanimous, increases whole pleasing to the eye degree, effectively reduces the product defective rate in the battery production process to reduction in production cost. Meanwhile, the internal resistance change of the battery cell and the compression ring caused by the difference of the expansion coefficients can be reduced by welding connection, the risk of the poor sealing performance of the battery cover group structure is reduced, and the battery cell can still keep better internal resistance consistency after being used for a long time. In addition, the welding process is simple, the operation speed is high, the battery product is more convenient to process, and the production efficiency can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a cross-sectional view of a battery cover assembly according to an embodiment of the present invention;

fig. 2 is a top view of a battery cover assembly structure according to an embodiment of the present invention.

In the figure:

1-cover plate; 2-electric core; 3, pressing a ring; 4-an insulator;

21-a stop; 22-a connecting part;

41-an insulating sleeve; 42-first insulating pad; 43-second insulating pad.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and 2, the present embodiment provides a battery cover assembly structure, which can be applied to the production of lithium batteries. This battery cover group structure includes apron 1, electric core 2 and clamping ring 3, is provided with the mounting hole on the apron 1, and electric core 2 passes apron 1 through the mounting hole, and the one end that electric core 2 stretches out apron 1 is located to the clamping ring 3 cover, and the clamping ring 3 be welded connection with the junction of electric core 2.

In the battery cover set structure provided by this embodiment, the outer wall of the battery core 2 is connected with the inner ring wall surface of the pressure ring 3 by a welding method, so that contact impedance between different metals is eliminated, the connection stability between the battery core 2 and the pressure ring 3 can be ensured, and the internal resistance consistency and the load capacity consistency of the battery core 2 are improved. Compare in prior art through the fixed mode of metal deformation agrees with, welded connection can prevent that clamping ring 3 from shifting, avoids electric core 2 to warp and damages, can guarantee that the outward appearance of product is unanimous, increases whole pleasing to the eye degree, effectively reduces the product defective rate in the battery production process to reduction in production cost. Meanwhile, the internal resistance change caused by the difference of the expansion coefficients of the battery core 2 and the pressure ring 3 can be reduced through welding connection, the risk of the poor sealing performance of the battery cover group structure is reduced, and the battery core 2 can still keep good internal resistance consistency after being used for a long time. In addition, the welding process is simple, the operation speed is high, the battery product is more convenient to process, the production efficiency can be improved, and the method is suitable for mass production of batteries.

Alternatively, referring to fig. 1, the inner ring wall surface of the pressure ring 3 and the outer wall of the battery cell 2 are welded. Fusion welding means that a welded joint is converted into a molten state under the action of high temperature during welding. Because the welded workpieces are closely attached together, the molten liquids of the two workpieces can be mixed under the action of a temperature field, gravity and the like, pressure is not required to be applied, and after the temperature is reduced, the molten parts are condensed, so that the two workpieces are firmly welded together.

In this embodiment, referring to the orientation in fig. 1, the upper end of the battery cell 2 and the contact surface of the pressure ring 3 are all welded together by means of metal melting along the circumferential direction. The operation mode of fusion welding is simple, the production speed is high, the fusion welding is suitable for mass production of the batteries, pressure is not required to be applied to the fusion welding, the compression ring 3 and the battery core 2 cannot be extruded, the internal resistance consistency of the batteries can be guaranteed, the reject ratio of battery products is effectively reduced, waste products are reduced, and the production cost is reduced. Specifically, before welding, the cover plate 1 (or the battery cell 2) is fixed on a fixture, then metal melting welding is performed by using a welding device (such as a galvanometer laser welding machine), and the battery cell 2 and the compression ring 3 are connected together in a melting mode through metal melting.

Optionally, the press ring 3 and the battery core 2 are welded continuously or at intervals. Namely, during fusion welding, the welding path between the pressure ring 3 and the battery core 2 can be continuous welding, the welding seam formed by the welding mode is continuous and uninterrupted, and the connection is firmer and more reliable. Of course, in another embodiment, the welding path between the press ring 3 and the battery cell 2 may also be interval welding, and this welding manner may form multiple segments of welding seams distributed at intervals along the circumferential direction of the battery cell. During specific welding, the welding method can be adaptively selected according to the design requirements of the battery. Further, the shape of the welding path between the battery cell 2 and the pressing ring 3 may be circular or other shapes, for example, if both the battery cell 2 and the pressing ring 3 are circular, the shape of the welding path is circular. The shape of the electric core 2 and the shape of the pressure ring 3 are selected during specific welding.

Preferably, the welding is performed by spot welding. In other embodiments, gas welding or argon arc welding may also be used.

Optionally, referring to fig. 1 and fig. 2, the battery cover assembly structure further includes an insulating member 4, where the insulating member 4 is sleeved on the electric core 2 to insulate and separate the electric core 2 from the cover plate 1, so as to prevent the battery from being accidentally turned on through the electric core 2 and the outside, and avoid short circuit of the battery.

Optionally, referring to fig. 1, the insulating member 4 includes an insulating sleeve 41 and a first insulating pad 42 disposed at one end of the insulating sleeve 41, the insulating sleeve 41 is sleeved on the electrical core 2, and a tube wall of the insulating sleeve 41 is clamped between an outer wall of the electrical core 2 and a wall of the mounting hole, so as to insulate the electrical core 2 from the cover plate 1. The first insulating pad 42 is clamped between the pressure ring 3 and the top surface of the cover plate 1 to insulate the pressure ring 3 from the cover plate 1.

With reference to fig. 1, optionally, a second insulating pad 43 is disposed on an end of the insulating sleeve 41 away from the first insulating pad 42, a stopping portion 21 is disposed on the electric core 2, and the second insulating pad 43 is sandwiched between the stopping portion 21 and the bottom surface of the cover plate 1 to insulate the stopping portion 21 of the electric core 2 from the cover plate 1. Further, the bottom end of the battery core 2 is provided with a connecting portion 22, and the connecting portion 22 is used for being connected with a tab of a battery, so as to realize a power supply function of the battery.

In this embodiment, the insulating sleeve 41, the first insulating pad 42, and the second insulating pad 43 are integrally formed and made of a rubber material, so that a good insulating effect can be achieved, and a sealing effect can be achieved to prevent liquid leakage in the battery.

Further, the first insulating pad 42 and the second insulating pad 43 are both circular, and in other embodiments, the first insulating pad 42 and the second insulating pad 43 may also be square or other polygonal shapes, which are not listed here.

Optionally, the battery cell 2 and the pressure ring 3 are both made of a metal material, and the metal materials selected for the battery cell 2 and the pressure ring 3 may be the same or different. For example, the cell 2 and the pressure ring 3 may be both made of aluminum material, or both made of stainless steel material. Of course, the cell 2 may be made of stainless steel, and the press ring 3 may be made of carbon steel, tungsten steel, or the like. That is, during actual processing, any one or two materials of the two materials can be selected as required to prepare the cell 2 and the pressure ring 3.

The production process of the battery cover assembly of the present embodiment is as follows:

the cell 2 and the compression ring 3 are connected together in a melting mode through metal melting, the cover plate 1 (or the cell 2) is fixed on a clamp before welding, then parameters of welding equipment are adjusted, a proper welding path and a proper welding mode (such as continuous welding or intermittent welding) are selected, and the outer wall of the cell 2 and the inner wall of the compression ring 3 are welded in a melting mode through the welding equipment (such as a galvanometer laser welding machine). After the fusion welding of the battery core 2 and the compression ring 3 is completed, the next production process of the battery can be directly carried out.

The embodiment also provides a battery, which comprises the battery cover group structure. The battery core 2 and the pressure ring 3 of the battery are stably connected, so that the consistency of the internal resistance and the load capacity of the battery is better, and the appearance of a battery product is attractive.

It should be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. The utility model provides a battery cover group structure, its characterized in that, includes apron (1), electric core (2) and clamping ring (3), clamping ring (3) cover is located electric core (2) stretch out the one end of apron (1), clamping ring (3) with the junction of electric core (2) is welded connection.

2. The battery cover group structure according to claim 1, wherein the inner ring wall surface of the pressure ring (3) and the outer wall of the battery core (2) are welded.

3. The battery cover group structure according to claim 1, wherein the compression ring (3) and the battery core (2) are welded continuously or at intervals.

4. The battery cover assembly structure according to claim 1, further comprising an insulating member (4), wherein the insulating member (4) is sleeved on the battery core (2).

5. The battery cover group structure according to claim 4, wherein a mounting hole is formed in the cover plate (1), the battery core (2) penetrates through the cover plate (1) through the mounting hole, the insulating member (4) comprises an insulating sleeve (41) and a first insulating pad (42) arranged at one end of the insulating sleeve (41), the insulating sleeve (41) is clamped between an outer wall of the battery core (2) and a wall of the mounting hole, and the first insulating pad (42) is clamped between the pressure ring (3) and a top surface of the cover plate (1).

6. The battery cover group structure according to claim 5, wherein a second insulating pad (43) is disposed at an end of the insulating sleeve (41) far away from the first insulating pad (42), a stopping portion (21) is disposed on the electric core (2), and the second insulating pad (43) is sandwiched between the stopping portion (21) and the bottom surface of the cover plate (1).

7. The battery cover pack structure according to claim 1, wherein the battery core (2) and the pressure ring (3) are both made of a metal material.

8. The battery cover group structure according to claim 7, characterized in that the battery cells (2) are made of aluminum material or stainless steel material.

9. The battery cover group structure according to claim 7, wherein the pressure ring (3) is made of a stainless steel material or a carbon steel material or an aluminum material.

10. A battery comprising the battery cover assembly structure of any one of claims 1-9.