CN219144300U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, which comprises a conductive shell, a current collecting disc and a bare cell, wherein the bare cell is arranged in the conductive shell, the conductive shell is provided with a first pole and a second pole, and the bare cell comprises a first pole lug and a second pole lug; the first pole is arranged on the conductive shell through an insulating piece, and is connected with the first pole lug through a current collecting disc to form a first conductive circuit; the second pole is connected with the conductive shell, the conductive shell is at least provided with one welding conductive part, the second pole lug is connected with the welding conductive part through welding, and the second pole lug, the conductive shell and the second pole are connected to form a second conductive circuit. The battery provided by the utility model has the advantages of reducing the number of parts, simplifying the processing structure and the processing steps, improving the production efficiency and reducing the production cost.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

At present, the positive electrode tab and the positive electrode post of the bare cell of the battery are electrically connected through the welding of the positive electrode current collecting disc, the negative electrode tab and the negative electrode post of the bare cell of the battery are electrically connected through the welding of the negative electrode current collecting disc, the processing structure and the processing technology are complex, the production efficiency is low, meanwhile, the number of parts is large, and the production cost is high.

Disclosure of Invention

The purpose of the utility model is that: the battery has the advantages of reducing the number of parts, simplifying the processing structure and the processing steps, improving the production efficiency and reducing the production cost.

In order to achieve the above object, the present utility model provides a battery, including a conductive housing, a current collecting disc, and a bare cell, wherein the bare cell is mounted in the conductive housing, the conductive housing is provided with a first pole and a second pole, and the bare cell includes a first pole ear and a second pole ear;

the first pole is arranged on the conductive shell through an insulating piece, and the first pole is connected with the first pole lug through the current collecting disc to form a first conductive circuit;

the second pole is connected with the conductive shell, at least one welding conductive part is formed on the conductive shell, the second pole is connected with the welding conductive part through welding, and the second pole, the conductive shell and the second pole are connected to form a second conductive circuit.

Preferably, the thickness of the welding conductive part is less than 0.5mm.

Preferably, the conductive housing includes a support reinforcing portion provided at an outer periphery of the welding conductive portion, and the thickness of the support reinforcing portion is greater than that of the support reinforcing portion.

Preferably, the welding conductive part is arranged corresponding to the second lug, and the welding conductive part is recessed towards the second lug.

As a preferable scheme, the conductive shell comprises a conductive upper cover, a conductive torch and a conductive bottom cover, wherein the conductive upper cover and the conductive bottom cover are respectively connected to two ends of the conductive torch.

Preferably, the second pole and the conductive upper cover are integrally formed, or the conductive torch and the conductive bottom cover are connected in a splice welding manner.

As a preferable scheme, the conductive cylinder is provided with an installation cavity, the bare cell is installed in the installation cavity, a limiting inclined surface is formed in the installation cavity, the upper end of the limiting inclined surface is in clearance fit with the outer side surface of the bare cell, and the lower end of the limiting inclined surface is in butt fit or interference fit with the outer side surface of the bare cell.

As the preferred scheme, the insulating piece includes insulating cover, sealing washer and negative pole insulating ring, the negative pole insulating ring with the insulating cover from last down install in proper order in first utmost point post, the lower extreme of first utmost point post with naked electric core is connected, the side of first utmost point post is respectively through insulating cover the sealing washer with the negative pole insulating ring with conductive housing's upper end insulation installation.

Preferably, the inner bottom surface of the conductive shell is in contact with the second lug.

Preferably, a plurality of the soldering conductive portions are provided.

Compared with the prior art, the battery provided by the embodiment of the utility model has the beneficial effects that: the first pole is connected with the first pole lug through the current collecting disc to form a first conductive circuit. The first pole is arranged at the upper end of the conductive shell through the insulating piece, and is insulated from the conductive shell, so that the first pole is prevented from being in short circuit with the second conductive circuit. The second pole is connected with the conductive shell, the conductive shell is welded with the second pole at the position of the welding conductive part through the welding conductive part on the conductive shell, the second pole is connected with the welding conductive part through welding, and the second pole, the conductive shell and the second pole are connected to form a second conductive circuit. The second pole lug is connected with the second pole column through the conductive shell to realize conduction, one current collecting disc of the existing structure is omitted, one current collecting disc is reduced, the cost of the cell structure is reduced, the assembling and welding procedures of one current collecting disc are reduced, the production efficiency of the battery is improved, and meanwhile the manufacturing cost of the battery is reduced.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Fig. 2 is a schematic view of the structure of the bottom surface of the conductive housing according to the embodiment of the utility model.

Fig. 3 is a schematic diagram of a soldering structure for soldering a conductive portion according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of the first pole and the second pole on the same side according to the embodiment of the present utility model.

Fig. 5 is a schematic structural diagram of the first pole and the second pole on opposite sides according to an embodiment of the present utility model.

Fig. 6 is a schematic diagram of the overall split structure of the embodiment of the present utility model.

Fig. 7 is a schematic diagram of a second post and a mounting structure on a conductive surface according to an embodiment of the utility model.

Fig. 8 is a schematic structural view of a limiting inclined plane according to an embodiment of the present utility model.

Fig. 9 is a schematic structural view of a limiting inclined plane according to another embodiment of the present utility model.

In the figure:

10. a conductive housing; 11. a conductive upper cover; 12. a conductive torch; 13. a conductive bottom cover; 14. an insulating cover; 15. a seal ring; 16. a negative electrode insulating ring; 17. welding the conductive part; 19. a support reinforcing part; 20. a mounting cavity; 21. a limiting inclined plane; 22. an outlet port; 23. a first pole; 24. a positioning ring; 25. a second post; 26. a rivet;

30. a collecting tray; 31. a first tab; 32. a second lug;

40. bare cell.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present utility model are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "connected," "fixed," and the like are used in the present utility model in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; the mechanical connection can be realized, and the welding connection can be realized; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 1 to 9, a battery according to a preferred embodiment of the present utility model includes a conductive housing 10, a current collecting plate 30, and a bare cell 40, the bare cell 40 is mounted in the conductive housing 10, the conductive housing 10 is provided with a first pole 23 and a second pole 25, and the bare cell 40 includes a first pole tab 31 and a second pole tab 32;

the first pole 23 is arranged at the upper end of the conductive shell 10 through an insulating piece, and the first pole 23 is connected with the first pole lug 31 through the current collecting disc 30 to form a first conductive circuit;

the second post 25 is connected to the conductive housing 10, at least one soldering conductive portion 17 is formed on the conductive housing 10, the second tab 32 is connected to the soldering conductive portion 17 by soldering, and the second tab 32, the conductive housing 10 and the second post 25 are connected to form a second conductive circuit.

In the battery of the utility model, the first pole 23 is connected with the first pole lug 31 through the current collecting disc 30 to form a first conductive circuit. The first pole 23 is installed at the upper end of the conductive shell 10 through an insulating piece, and the first pole 23 is insulated from the conductive shell 10, so that the first pole 23 is prevented from being in short circuit with the second conductive circuit. The second pole 25 is connected to the conductive housing 10, and the conductive housing 10 is welded to the second pole 32 at the position of the welded conductive portion 17 by the welded conductive portion 17 on the conductive housing 10, so that the second pole 32 is connected to the welded conductive portion 17 to form a second conductive circuit, and the second pole 32, the conductive housing 10 and the second pole 25 are connected to each other. The welding seam is formed by welding, and the second lug 32 and the second pole 25 are connected through the welding seam conductive shell 10 to realize conduction, so that one current collecting disc 30 of the existing structure is omitted, one current collecting disc 30 is reduced, the cell structure cost is reduced, the assembly welding procedure of one current collecting disc 30 is reduced, the production efficiency of the battery is improved, and meanwhile, the manufacturing cost of the battery is reduced. Meanwhile, the removal of the current collecting disc 30 at the bottom of the conductive shell 10 is beneficial to improving the heat dissipation of the bottom of the bare cell 40, improving the heat dissipation effect of the battery and prolonging the service life of the battery.

One of the first and second posts 23 and 25 is a positive post, and the other is a negative post. One of the first tab 31 and the second tab 32 is a negative electrode tab, and the other is a positive electrode tab. The first conductive circuit is communicated with the second conductive circuit to form a battery conductive loop.

As an example, as shown in fig. 4 to 5, the first pole 23 is located at the upper end of the conductive housing 10, and the second pole 25 is located at the upper end or the lower end of the conductive housing 10.

Further, as shown in fig. 3 to 5, the thickness of the soldering conductive portion 17 is less than 0.5mm. The thickness of the welding conductive part 17 is too large, which is not beneficial to realizing welding. Because the thickness of the second lug 32 is thinner, when the thickness of the welding conductive part 17 is larger, the welding power needs to be increased, but the excessive welding power can burn through or undercut the second lug 32, so that the grains of a heat affected zone of the welding seam are coarse, and the mechanical property of the welding joint is affected.

Preferably, the thickness of the welding conductive part 17 is set to be 0.2mm-0.4mm, the thickness of the welding conductive part 17 is similar to that of the second lug 32, the welding effect is good, the conductivity is improved, and the occurrence of cold joint is avoided.

As one example, as shown in fig. 3, the soldering conductive portion 17 is a part of the bottom surface of the conductive housing 10, or as shown in fig. 4 to 5, the soldering conductive portion 17 is the entire bottom surface of the conductive housing 10, or as shown in fig. 3, a part of the bottom surface of the conductive housing 10 is the soldering conductive portion 17, and the other part has a thickness larger than that of the soldering conductive portion 17.

As one example, as shown in fig. 2, a plurality of soldering conductive portions 17 are provided. The plurality of welding conductive parts 17 are respectively welded with the second lug 32 to form a plurality of conductive blocks 18, so that the problem that the battery cannot be used normally due to the conduction failure of one conductive block 18 is avoided, and the conduction stability is improved.

As an embodiment, the bare cell 40 is a full tab, so that the positioning problem of the first tab 31 and the current collecting plate 30 is avoided, and the production efficiency is improved.

Further, as shown in fig. 3, the conductive housing 10 includes a support reinforcing portion 19, and the support reinforcing portion 19 has a thickness greater than that of the soldering conductive portion 17. The supporting reinforcement 19 is provided at the outer circumference of the welding conductive part 17, the supporting reinforcement 19 is thicker than the welding conductive part 17, the conductive case 10 of the battery provides greater supporting strength and rigidity, and the battery's impact resistance is improved.

As one example, as shown in fig. 3, the bottom surface of the conductive housing 10 is composed of a soldered conductive part 17 and a supporting reinforcing part 19.

As one example, as shown in fig. 3, the area of the welding conductive part 17 occupies 5% -30% of the bottom surface area of the conductive housing 10, and the area of the supporting reinforcement part 19 occupies 70% -95% of the bottom surface area of the conductive housing 10, thereby satisfying the welding process requirements and ensuring the conductive effect, while ensuring the anti-impact capability of the conductive housing 10.

Further, as shown in fig. 3 to 5, the soldering conductive portion 17 is provided corresponding to the position of the second tab 32, and the soldering conductive portion 17 is recessed toward the second tab 32. The welding conducting part 17 is recessed towards the second lug 32, so that the distance between the welding conducting part 17 and the second lug 32 is shortened, the welding difficulty is reduced, the excessive increase of the welding quantity of a welding line is avoided, the occurrence of cold joint is avoided, and the production efficiency is improved.

Further, as shown in fig. 1 to 2, the conductive housing 10 includes a conductive upper cover 11, a conductive cylinder 12, and a conductive bottom cover 13, and the conductive upper cover 11 and the conductive bottom cover 13 are respectively connected to both ends of the conductive cylinder 12. The conductive upper cover 11, the conductive barrel 12 and the conductive bottom cover 13 are connected to form a complete conductive shell 10, the bare cell 40 is fixed in the conductive shell 10, effective protection is realized on the bare cell 40, and the bare cell 40 is prevented from deforming.

Further, as shown in fig. 6, the second post 25 and the conductive upper cover 11 are integrally formed, and/or the conductive barrel 12 and the conductive bottom cover 13 are integrally formed, so that the assembly steps can be reduced, the assembly efficiency can be improved, meanwhile, the conduction between the second post 25 and the second lug 32 due to poor welding is reduced, the conduction between the second post 25 and the second lug 32 is influenced, and the conduction effectiveness between the second post 25 and the second lug 32 is improved.

As an embodiment, as shown in fig. 6, the second post 25 and the conductive upper cover 11 are integrally formed, the conductive cylinder 12 and the conductive bottom cover 13 are integrally formed, the structural integrity of the conductive housing 10 is strong, meanwhile, the assembly steps are few, the assembly efficiency is improved, and the conductive effectiveness between the second post 25 and the second post 32 is high. Wherein the integral molding is formed by die stamping.

As one embodiment, the conductive torch 12 and the conductive bottom cover 13 are separately arranged, that is, the conductive torch 12 and the conductive bottom cover 13 are splice welded. When the thickness of the conductive bottom cover 13 is larger, the yield of the stamping integrated forming is lower, and the split type arrangement effectively ensures the yield of the conductive shell 10.

Further, as shown in fig. 7 to 8, the conductive torch 12 is provided with an installation cavity 20, the bare cell 40 is installed in the installation cavity 20, a limiting inclined surface 21 is formed in the installation cavity 20, the upper end of the limiting inclined surface 21 is in clearance fit with the outer side surface of the bare cell 40, the bare cell 40 is convenient to put in, the lower end of the limiting inclined surface 21 is in abutting fit or interference fit with the outer side surface of the bare cell 40, the lower end of the bare cell 40 is limited through the lower end of the limiting inclined surface 21, the lower end of the bare cell 40 is prevented from moving along the radial direction, the radial impact stress on a welding seam is reduced, the service life of the conductive part is prolonged, and the effective connection of the welding seam with the second lug 32 and the welding conductive part 17 is ensured.

As an example, as shown in fig. 7, the upper end of the limiting inclined surface 21 is located at the middle or middle lower portion of the mounting cavity 20, and the limiting inclined surface 21 is shortened in the height direction, which contributes to reducing the material usage of the conductive housing 10 and to improving the weight saving of the product.

As an example, as shown in fig. 8, the upper end of the limiting inclined surface 21 is located at the upper end of the mounting cavity 20, and the fixing effect on the whole bare cell 40 is better because the span of the limiting inclined surface 21 in the height direction is larger.

As one example, as shown in fig. 7 to 8, an included angle a is formed between the limit inclined surface 21 and the height direction, and a is 0 degree or more and 10 degrees or less.

As one example, as shown in FIGS. 7 to 8, the included angle a is set at 3.ltoreq.a.ltoreq.10.

As an embodiment, the first pole 23 and the second pole 25 are respectively mounted on the conductive upper cover 11, the first pole 23 is in insulating fit with the conductive upper cover 11, the first pole 23 is electrically connected with the first tab 31 of the bare cell 40 through the current collecting disc 30, and the second pole 25 is electrically connected with the second tab 32 through the conductive upper cover 11, the conductive barrel 12 and the conductive bottom cover 13.

Further, as shown in fig. 7, the insulating member includes an insulating cover 14, a sealing ring 15 and a negative insulating ring 16, the sealing ring 15 and the insulating cover 14 are sequentially installed on a first pole 23 from top to bottom, the lower end of the first pole 23 is connected with the bare cell 40, and the side surface of the first pole 23 is installed in an insulating manner with the upper end of the conductive housing 10 through the insulating cover 14, the sealing ring 15 and the negative insulating ring 16. The first pole 23 is insulated from the conductive shell 10 by the insulating cover 14, the sealing ring 15 and the negative electrode insulating ring 16, so that the first pole 23 and the second pole 25 are prevented from being communicated and conductive to cause short circuit.

As shown in fig. 7, the conductive upper cover 11 is provided with an outlet 22, the first pole 23 extends upwards from the outlet 22 to extend outwards radially to form a positioning ring 24, the insulating cover 14 is located between the conductive upper cover 11 and the positioning ring 24, insulation between the first pole 23 and the conductive upper cover 11 is achieved in the height direction, the sealing ring 15 and the negative electrode insulating ring 16 are sleeved on the first pole 23 from bottom to top, the outer side surface of the first pole 23 is in contact with the sealing ring 15 and the inner ring surface of the negative electrode insulating ring 16, the outer side surface of the sealing ring 15 is in contact with the inner side surface of the outlet 22 of the conductive upper cover 11, insulation between the side surface of the first pole 23 and the inner side surface of the outlet 22 is achieved, the inner ring surface of the negative electrode insulating ring 16 is in contact with the outer side surface of the conductive upper cover 11, and fixation of the conductive upper cover 11 is achieved.

As an example, as shown in fig. 7, the upper end of the negative electrode insulating ring 16 is connected with a rivet 26, and the rivet 26 is riveted with the negative electrode insulating ring 16 to fix the negative electrode insulating ring 16.

As an embodiment, as shown in fig. 7, the shape of the insulating cover 14 is adapted to the shape of the conductive upper cover 11, and the insulating cover 14 covers the bottom surface of the conductive upper cover 11 to avoid the connection between the first tab 31 and the conductive upper cover 11.

As one example, the side surface of the bare cell 40 is insulated from the conductive case 10.

Further, as shown in fig. 3 to 5, the inner bottom surface of the conductive shell 10 is abutted against the second lug 32, the inner bottom surface of the conductive shell 10 is in contact with the second lug 32, no solder is needed when the conductive shell 10 is welded with the second lug 32, and the welding seam is formed by directly abutted against the welding, so that the welding steps are fewer, the operation is simple, the occurrence of false welding is avoided, and the production efficiency is improved.

A process for producing a battery, as shown in fig. 1 to 9, comprising the steps of:

the bottom of the conductive housing 10 is punched to form a welded conductive part 17;

the bare cell 40 is put into the conductive shell 10, the first tab 31 is welded with the current collecting disc 30, the current collecting disc 30 is welded with the first pole 23, and the first pole 23 extends out of the upper end of the conductive shell 10;

the welding conductive part 17 and the second pole 25 are welded to form a conductive block 18, and the battery assembly is completed.

As an embodiment, as shown in fig. 3 to 5, the current collecting plate 30 is bent to form a U shape, wherein the opening of the U shape faces the side, and two ends of the U shape are welded with the first tab 31 and the first post 23, respectively.

The utility model forms the welding conductive part 17 by punching, the welding conductive part 17 forms the conductive block 18 by welding with the second lug 32, and the second lug 32, the conductive block 18, the conductive shell 10 and the second post 25 are connected to form a second conductive circuit. Compared with the prior art, the use of one current collecting disc 30 is reduced, the cost of the cell structure is reduced, the assembly welding procedure of one current collecting disc 30 is reduced, the production efficiency of the battery is improved, and meanwhile, the manufacturing cost of the battery is reduced.

As one embodiment, the bottom surface of the conductive housing 10 is stamped, so that the bottom surface of the conductive housing 10 is composed of the welded conductive portion 17 and the supporting reinforcing portion 19, and the bottom surface of the conductive housing 10 is made to meet the strength requirement of the conductive housing 10 while the conductive block 18 can be formed by welding with the second lug 32.

As one example, the welding conductive portion 17 and the second tab 32 are welded by spot welding. The welding seam in the technical scheme is welded by a spot welding method, is suitable for the prior production equipment, and has the advantages of no need of replacement of welding equipment and low improvement cost.

In summary, the embodiment of the present utility model provides a battery, where the first electrode post 23 is connected to the first electrode tab 31 through the current collecting plate 30 to form a first conductive circuit. The first pole 23 is installed at the upper end of the conductive shell 10 through an insulating piece, and the first pole 23 is insulated from the conductive shell 10, so that the first pole 23 is prevented from being in short circuit with the second conductive circuit. The second pole 25 is connected to the conductive housing 10, and the conductive housing 10 is welded to the second pole 32 at the position of the welded conductive portion 17 by the welded conductive portion 17 on the conductive housing 10, and the second pole 32, the conductive housing 10 and the second pole 25 are connected to form a second conductive circuit by welding between the second pole 32 and the welded conductive portion 17. The welding seam is formed by welding, and the second lug 32 and the second pole 25 are connected through the conductive shell 10 to realize conduction, so that one current collecting disc 30 of the existing structure is omitted, one current collecting disc 30 is reduced, the structural cost of the battery is reduced, the assembly welding procedure of one current collecting disc 30 is reduced, the production efficiency of the battery is improved, and meanwhile, the manufacturing cost of the battery is reduced.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (10)

1. A battery, characterized in that: the current collecting plate is arranged in the conductive shell, the conductive shell is provided with a first pole and a second pole, and the bare cell comprises a first pole lug and a second pole lug;

the first pole is arranged on the conductive shell through an insulating piece, and the first pole is connected with the first pole lug through the current collecting disc to form a first conductive circuit;

the second pole is connected with the conductive shell, at least one welding conductive part is formed on the conductive shell, the second pole is connected with the welding conductive part through welding, and the second pole, the conductive shell and the second pole are connected to form a second conductive circuit.

2. The battery according to claim 1, wherein: the thickness of the welding conductive part is smaller than 0.5mm.

3. The battery according to claim 1, wherein: the conductive shell comprises a support reinforcing part, the support reinforcing part is arranged on the periphery of the welding conductive part, and the thickness of the support reinforcing part is larger than that of the welding conductive part.

4. A battery according to claim 1 or 3, characterized in that: the welding conductive parts are arranged corresponding to the second lug in position, and the welding conductive parts are recessed towards the second lug.

5. The battery according to claim 1, wherein: the conductive shell comprises a conductive upper cover, a conductive torch and a conductive bottom cover, wherein the conductive upper cover and the conductive bottom cover are respectively connected to two ends of the conductive torch.

6. The battery according to claim 5, wherein: the second pole is integrally formed with the conductive upper cover, or the conductive torch is integrally formed with the conductive bottom cover, or the conductive torch is connected with the conductive bottom cover in a tailor-welded mode.

7. The battery according to claim 5, wherein: the conductive cylinder is provided with an installation cavity, the bare cell is installed in the installation cavity, a limiting inclined surface is formed in the installation cavity, the upper end of the limiting inclined surface is in clearance fit with the outer side surface of the bare cell, and the lower end of the limiting inclined surface is in butt fit or interference fit with the bare cell.

8. The battery according to claim 1, wherein: the insulating piece comprises an insulating cover, a sealing ring and a negative electrode insulating ring, wherein the negative electrode insulating ring and the insulating cover are sequentially arranged on the first pole column from top to bottom, the lower end of the first pole column is connected with the bare cell, and the side surfaces of the first pole column are respectively arranged through the insulating cover, the sealing ring and the negative electrode insulating ring in an insulating manner with the upper end of the conductive shell.

9. The battery according to claim 1, wherein: the inner bottom surface of the conductive shell is in contact with the second lug.

10. The battery according to claim 1, wherein: the welding conductive part is provided with a plurality of welding conductive parts.

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