阅读说明：本技术 一种电池的制备方法及电池 (Preparation method of battery and battery ) 是由 赵赫 宋富强 陈强 刘静 徐悦斌 何巍 于 2021-07-30 设计创作，主要内容包括：本发明涉及电池技术领域,公开了一种电池的制备方法及电池。电池的制备方法包括S1：制备电池的壳体、卷芯以及汇流盘。S2：将卷芯的正极集流体与一个汇流盘的底面焊接连接,和/或将卷芯的负极集流体与另一个汇流盘的底面焊接连接。S3：将卷芯安装于壳体内,并使汇流盘的侧壁抵接于壳体的内壁的焊接位置。S4：将壳体放置于焊接机的线圈内,并向线圈通交变电流,以在壳体的焊接位置产生电流,对汇流盘与壳体进行电阻焊。采用电阻焊提高了壳体与汇流盘的焊接效率,有利于提高电池的生产效率,降低生产成本。同时,电阻焊能够避免对壳体的外观和镀层造成损伤,提高了焊接质量。此外,还能够避免激光焊接时焊渣飞溅进入电池内部的问题。(The invention relates to the technical field of batteries, and discloses a battery preparation method and a battery. The preparation method of the battery comprises the following steps of S1: and preparing a shell, a winding core and a bus tray of the battery. S2: and welding the positive current collector of the roll core with the bottom surface of one bus disc, and/or welding the negative current collector of the roll core with the bottom surface of the other bus disc. S3: and mounting the winding core in the shell, and enabling the side wall of the bus disc to abut against the welding position of the inner wall of the shell. S4: and placing the shell in a coil of a welding machine, and applying alternating current to the coil to generate current at the welding position of the shell so as to perform resistance welding on the bus disc and the shell. The welding efficiency of the shell and the confluence disc is improved by adopting resistance welding, the production efficiency of the battery is improved, and the production cost is reduced. Meanwhile, the resistance welding can avoid damage to the appearance and the coating of the shell, and the welding quality is improved. In addition, the problem that welding slag splashes to enter the interior of the battery during laser welding can be avoided.)

1. A method of making a battery, comprising:

s1: preparing a shell (1), a roll core and a bus disc (2) of the battery;

s2: welding the positive current collector of the winding core with the bottom surface of one bus disc (2), and/or

Welding and connecting the negative current collector of the roll core with the bottom surface of the other bus disc (2);

s3: the winding core is installed in the shell (1), and the side wall of the bus disc (2) is abutted against the welding position of the inner wall of the shell (1);

s4: placing the shell (1) in a coil (4) of a welding machine, and supplying alternating current to the coil (4) to generate current at the welding position of the shell (1) so as to perform resistance welding on the confluence disc (2) and the shell (1).

2. The method for manufacturing a battery according to claim 1, further comprising a step between the step S2 and the step S3

S30: and coating the side wall of the confluence disc (2) with soldering flux (3).

3. The method of producing a battery according to claim 1, wherein in step S4, the case (1) is held by a jig to fixedly dispose the case (1) within the coil (4).

4. The method for producing a battery according to claim 3, wherein in step S4, the position of the coil (4) is adjusted so that the coil (4) is opposed to the welding position on the case (1).

5. The method of claim 1, wherein the frequency of the alternating current is 400Hz to 700Hz in step S4.

6. The method for producing a battery according to claim 5, wherein in step S4, the energization time of the coil (4) is 3S to 8S.

7. The method of manufacturing a battery according to claim 1, wherein in step S4, when the case (1) is welded to two bus bars (2) at the same time, the number of the coils (4) is two, and alternating current is simultaneously supplied to the two coils (4).

8. The method of manufacturing a battery according to claim 1, wherein, in step S2, the positive electrode current collector is joined to the bottom surface of the bus bar (2) by laser welding, and/or

The negative current collector is connected with the bottom surface of the confluence disc (2) through laser welding.

9. The method for manufacturing a battery according to claim 1, further comprising a step after step S4

S5: and bending and packaging the shell (1) to prepare the battery.

10. A battery produced by the method for producing a battery according to any one of claims 1 to 9.

Technical Field

The invention belongs to the technical field of batteries, and particularly relates to a battery preparation method and a battery.

Background

The cylindrical steel shell battery has higher rigidity, pressure resistance and deformation resistance, and the mechanical strength of the cylindrical steel shell battery is obviously superior to that of an aluminum shell battery, a plastic shell battery and a flexible package battery. Meanwhile, the battery core is limited in the steel shell with better rigidity, so that the change of the charging and discharging volume is small, the space design of the module is more convenient, and the battery (cylindrical steel shell battery) with the nickel-plated steel shell as the shell is more generally applied.

At present, the negative pole and/or the positive pole of cylinder steel-shelled battery adopt converge dish and utmost point ear integral type design, will converge the dish and roll up the core, converge dish and casing and weld through laser welding's mode, accomplish the encapsulation.

In the production process of the cylindrical steel shell battery, the following problems exist: the production efficiency of laser welding is low, and the cost is high. Further, the appearance of the case is poor and the plating layer on the surface layer of the case is easily damaged. In addition, welding slag generated by laser welding is easy to splash into the coiled core, and the conductivity and safety of the battery are affected.

Disclosure of Invention

One object of the present invention is to provide a method for manufacturing a battery, which protects the appearance and the plating layer of a case, prevents the generation of welding slag during the welding process of the case and a bus tray, and improves the welding quality and the welding efficiency of the case and the bus tray.

Another object of the present invention is to provide a battery, which protects the appearance and the plating layer of the case, prevents the generation of welding slag during the welding process between the case and the bus tray, and improves the welding quality and the welding efficiency between the case and the bus tray.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method of making a battery comprising:

s1: preparing a shell, a roll core and a bus tray of the battery;

s2: welding the positive current collector of the winding core with the bottom surface of one bus disc, and/or

Welding and connecting the negative current collector of the roll core with the bottom surface of the other bus disc;

s3: installing the winding core in the shell, and enabling the side wall of the bus disc to abut against the welding position of the inner wall of the shell;

s4: and placing the shell in a coil of a welding machine, and applying alternating current to the coil to generate current at the welding position of the shell so as to perform resistance welding on the confluence disc and the shell.

Further, a step is included between step S2 and step S3

S30: and coating soldering flux on the side wall of the confluence disc.

Further, in step S4, the case is clamped by a jig to fixedly dispose the case inside the coil.

Further, in step S4, the position of the coil is adjusted so that the coil is directly opposite to the welding position on the housing.

Further, in step S4, the frequency of the alternating current is 400Hz to 700 Hz.

Further, in step S4, the energization time of the coil is set to 3S to 8S.

Further, in step S4, when the case is welded to the two bus bars at the same time, the number of the coils is two, and an alternating current is simultaneously supplied to the two coils.

Further, in step S2, the positive electrode collector is connected to the bottom surface of the bus bar by laser welding, and/or

And the negative current collector is connected with the bottom surface of the confluence disc through laser welding.

Further, step S4 is followed by step S4

S5: and bending and packaging the shell to prepare the battery.

A battery is prepared by the preparation method of the battery.

The invention has the beneficial effects that:

according to the preparation method of the battery, the shell and the bus disc are welded and connected through resistance welding, compared with the existing laser welding, the welding efficiency of the shell and the bus disc is improved through resistance welding, the production efficiency of the battery is improved, and the production cost is reduced. Meanwhile, the resistance welding can avoid damage to the appearance and the coating of the shell, and the welding quality is improved. In addition, the welding slag can be prevented from splashing to enter the battery during laser welding, and the welding quality is further improved.

By adopting the preparation method of the battery, the welding efficiency of the shell and the confluence disc can be improved, so that the production efficiency of the battery is improved, and the production cost is reduced. Meanwhile, the appearance and the coating of the shell can be protected, and the welding quality is improved. In addition, the welding slag can be prevented from splashing to enter the battery during laser welding, and the welding quality is further improved.

Drawings

Fig. 1 is a detailed flowchart of a method for manufacturing a battery according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a bus bar tray according to an embodiment of the present invention;

fig. 3 is a longitudinal sectional view of a battery according to an embodiment of the present invention when welded;

fig. 4 is a cross-sectional view of a battery provided by an embodiment of the present invention when welded.

The component names and designations in the drawings are as follows:

1. a housing; 2. a confluence disc; 3. soldering flux; 4. and a coil.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The present embodiment discloses a cylindrical steel-shelled battery, which includes a roll core (not shown), a case 1, and a bus tray 2. In the production process of the cylindrical steel shell battery, the negative pole and/or the positive pole of the cylindrical steel shell battery are/is designed in an integrated mode of the confluence disc 2 and the lugs.

In the current production process, the mode through laser welding will converge dish 2 and roll up the core, converge dish 2 and casing 1 weld, accomplish the encapsulation. Because the production efficiency of laser welding is lower, and is with high costs, cause casing 1 outward appearance bad and the cladding material on casing 1 top layer damaged moreover easily, need carry out anticorrosive treatment after the welding is accomplished, increased the process flow of battery. In addition, welding slag generated by laser welding is easy to splash into the coiled core, and the conductivity and safety of the battery are affected.

In order to solve the above problem, as shown in fig. 1, the present embodiment discloses a method for manufacturing a battery, in which a welding process of a cylindrical steel-shell battery is improved by resistance welding, and a welded connection between a bus bar tray 2 and a case 1 is realized.

Specifically, the method for manufacturing the battery of the present embodiment includes:

s1: a case 1, a roll core, and a bus bar 2 of the battery were prepared.

S2: welding the positive current collector of the winding core to the bottom of a collector disc 2, and/or

And welding and connecting the negative current collector of the winding core with the bottom surface of the other bus disc 2.

S3: the winding core is mounted in the case 1, and the side wall of the bus bar 2 is abutted against the welding position of the inner wall of the case 1.

S4: the shell 1 is placed in a coil 4 of a welding machine, alternating current is conducted to the coil 4, so that current is generated at the welding position of the shell 1, and resistance welding is conducted on the bus bar 2 and the shell 1.

In this embodiment, the welding efficiency of the shell 1 and the bus tray 2 is improved by resistance welding, which is beneficial to improving the production efficiency of the battery and reducing the production cost. Meanwhile, the resistance welding can avoid damage to the appearance and the coating of the shell 1, and the welding quality is improved. In addition, the welding slag can be prevented from splashing to enter the battery during laser welding, and the welding quality is further improved.

As shown in fig. 2, the bus bar tray 2 prepared in this embodiment is made of nickel-plated copper, has good electrical conductivity, thermal conductivity, corrosion resistance and processability, and facilitates resistance welding between the bus bar tray 2 and the case 1. Specifically, the confluence disc 2 comprises a circular bottom wall and an annular side wall arranged around the outer edge of the bottom wall. The bus bar 2 may be obtained by machining, and the specific size is determined according to the design requirement of the battery, and is not particularly limited herein.

As shown in fig. 3, the casing 1 prepared in this embodiment has a cylindrical structure, and one end of the casing 1 in the axial direction thereof has an opening. Specifically, the shell 1 is a nickel-plated steel shell to improve the structural strength of the prepared battery. The number of the current collecting disc 2 is one, and the negative current collector of the winding core is connected with the bottom surface of the current collecting disc 2 through laser welding, so that the current collecting disc 2 forms the negative electrode of the battery. The positive electrode current collector of the winding core is connected with the inner bottom wall of the case 1 by laser welding so that the bottom wall of the case 1 forms the positive electrode of the battery. Alternatively, the positive electrode collector of the jelly roll (not shown) is connected to the bottom surface of the bus bar 2 by laser welding so that the bus bar 2 forms the positive electrode of the battery. The negative current collector of the jelly roll is connected to the inner bottom wall of the can 1 by laser welding so that the bottom wall of the can 1 forms the negative electrode of the battery. Because the heat that laser welding produced is less, can reduce the deflection of casing 1 and converge dish 2, be favorable to guaranteeing the structural stability of cylinder steel-shelled battery. Of course, other welding modes can be adopted to weld the winding core and the shell 1 and the winding core and the bus disc 2, and the stable welding of the winding core can be realized.

In other embodiments, the housing 1 has a cylindrical structure, and both ends of the housing 1 in the axial direction thereof are open. At this time, the number of the bus discs 2 is two, and the positive current collector of the winding core is connected to the bottom surface of one bus disc 2 by laser welding, so that the bus disc 2 forms the negative electrode of the battery. The positive electrode current collector of the winding core is connected with the bottom surface of the other bus disc 2 through laser welding, so that the bus disc 2 forms the positive electrode of the battery.

Further, between step S2 and step S3, step S30 is further included: and coating the soldering flux 3 on the side wall of the confluence disc 2. As shown in fig. 2, before the bus bar 2 is mounted on the housing 1, the flux 3 is uniformly applied to the outer surface of the side wall of the bus bar 2 to improve the welding quality between the housing 1 and the bus bar 2. Specifically, the flux solder 3 may be a silver solder paste or the like.

In order to achieve good sealing performance of the battery, step S5 is further included after step S4: and bending and packaging the shell 1 to prepare the battery. Specifically, as shown in fig. 3, a reserved portion is provided at the welding position of the housing 1 and the opening end of the housing 1, and after the welding of the bus bar 2 is completed, the side wall of the reserved portion of the housing 1 is bent toward the inside of the housing 1 by a bending machine and is stacked on the bus bar 2 to form a sealing structure, so that the sealing effect of the battery is further improved.

In step S4 of this embodiment, the casing 1 is clamped by the fixture to fix the casing 1 in the coil 4, so that the casing 1 is stably placed, and the stable welding between the casing 1 and the bus tray 2 is ensured. The clamp of the embodiment can be a clamp on a battery production line and can also be a clamp on a welding machine. The clamp only needs to clamp and fix the shell, and the structure of the clamp is not limited specifically.

As shown in fig. 4, the number of the bus bar disks 2 is one, and the negative electrode current collector of the winding core is welded to the bottom surface of the bus bar disk 2. When the housing 1 is placed in the coil 4 of the welding machine, there is a gap between the coil 4 and the housing 1. And (3) turning on the welding machine, introducing high-frequency alternating current to the coil 4 to generate current between the side wall of the confluence disc 2 and the shell 1, heating the confluence disc 2 and the shell 1, and completing resistance welding between the confluence disc and the shell 1.

The larger the distance between the welding position of the coil 4 and the case 1 in the axial direction of the case 1, the smaller the current generated at the welding position of the case 1. Therefore, in step S4, the position of the coil 4 is adjusted so that the coil 4 is directly opposite to the welding position on the housing 1, so that a large current is generated at the welding position, and the welding efficiency and the welding quality are improved.

In other embodiments, in step S4, when the case 1 and the two bus bars 2 are welded at the same time, the number of the coils 4 is two, and the alternating current is simultaneously supplied to the two coils 4, so that the case 1 and the two bus bars 2 are resistance welded at the same time, thereby improving the welding efficiency and the production efficiency of the battery. Similarly, the displacement of the two coils 4 in the axial direction of the housing 1 is adjusted so that the two coils 4 are respectively opposed to two welding positions on the housing 1.

Specifically, in step S4, the frequency of the alternating current of the present embodiment is 400Hz to 700 Hz. For example, the frequency of the alternating current may be 400Hz, 450Hz, 500Hz, 550Hz, 600Hz, 700Hz, and the like. The energization time of the coil 4 is 3s to 8 s. For example, the energization time may be 3s, 4s, 5s, and the like. In the embodiment, when the welding machine continuously supplies the 450Hz alternating current for 3 s-5 s into the coil 4, the shell 1 and the confluence disc 2 are welded. Of course, the frequency and time of the alternating current may also be adapted according to the specific welding requirements, and are not limited in this regard.

The battery of the embodiment is manufactured by the manufacturing method of the battery, so that the resistance welding of the shell 1 and the bus plate 2 is realized, the welding efficiency of the shell 1 and the bus plate 2 and the production efficiency of the battery are improved, and the production cost is reduced. Meanwhile, the resistance welding can avoid damage to the appearance and the coating of the shell 1, and the welding quality is improved. In addition, the welding slag can be prevented from splashing to enter the battery during laser welding, the welding quality is further improved, and the safety of the battery is ensured.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.