CN220086334U - Single-pass cylindrical battery - Google Patents

Abstract

The utility model relates to the technical field of cylindrical batteries, in particular to a single-pass cylindrical battery, which comprises: the device comprises a winding core, an anode current collecting disc, a shell and an explosion-proof valve; the positive electrode lug of the winding core is connected with the positive electrode current collecting disc to form a winding core assembly; the winding core component is arranged in the shell, and the bottom of the shell along the height direction is connected with the positive electrode current collecting disc; the shell is provided with a mounting groove and a first liquid injection hole, the positive electrode current collecting disc is provided with a second liquid injection hole, and the mounting groove, the first liquid injection hole and the second liquid injection hole are sequentially communicated and are arranged corresponding to the central hole of the winding core; the explosion-proof valve is arranged in the mounting groove. It can be seen that the bottom of casing is removed to annotating liquid hole and explosion-proof valve to make explosion-proof valve and annotate liquid hole and correspond to the center setting of rolling up the core, both promoted annotate liquid efficiency, guaranteed broad pressure release passageway again, make the drainage pressure stable, the security is higher, owing to install the explosion-proof valve in the bottom of casing moreover, realized electrical separation, safer, reliable.

Description

Single-pass cylindrical battery

Technical Field

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

Background

At present, the liquid injection hole of single-pass cylindrical battery, explosion-proof valve all set up at the top of casing, because the negative pole post occupies the central point of the top of casing, the central point of the reel core of casing inside is corresponding to the negative pole post promptly, lead to annotating liquid hole and explosion-proof valve and only can install other positions at the top of casing, and then can't form wide notes liquid passageway and exhaust passage, have influenced notes liquid efficiency and pressure release stability like this, in addition, because the explosion-proof valve is installed in the bottom of casing, excretory gas can contact electrical components such as busbar at top, causes the potential safety hazard.

Disclosure of Invention

The utility model aims to provide a single-pass cylindrical battery, which solves the technical problems that the installation positions of a liquid injection hole and an explosion-proof valve of the single-pass cylindrical battery are staggered with the central hole of a winding core in the prior art, the liquid injection efficiency and the pressure release stability are affected, the electrical separation cannot be realized, and the potential safety hazard is caused.

The utility model provides a single-pass cylindrical battery, which comprises: the device comprises a winding core, an anode current collecting disc, a shell and an explosion-proof valve; the positive electrode lug of the winding core is connected with the positive electrode current collecting disc to form a winding core assembly; the winding core component is arranged in the shell, and the bottom of the shell along the height direction of the winding core component is connected with the positive electrode current collecting disc;

the shell is provided with a mounting groove and a first liquid injection hole, the positive electrode current collecting disc is provided with a second liquid injection hole, and the mounting groove, the first liquid injection hole and the second liquid injection hole are sequentially communicated and are arranged corresponding to the central hole of the winding core; the explosion-proof valve is arranged in the mounting groove.

In the above technical solution, further, a thickened portion protruding toward the inside of the housing is formed at the bottom of the housing, and the mounting groove and the first liquid injection hole are formed at the thickened portion.

In any of the above technical solutions, further, the positive current collecting plate is formed with a positioning groove, and the thickened portion is mounted in the positioning groove.

In any of the above technical solutions, further, the positive current collecting plate is formed with a first welding protrusion, a positioning pit is formed on an inner wall of a bottom of the case, and the first welding protrusion is installed in the positioning pit.

In any of the above technical solutions, further, a thinning pit is formed on an outer wall of the bottom of the housing, and the thinning pit is disposed opposite to the positioning pit.

In any of the above embodiments, further, the number of the first welding protrusions is a plurality.

In any of the above solutions, further, the plurality of welding protrusions are uniformly distributed with the center of the winding core as a center.

In any of the above technical solutions, further, the positive electrode current collecting disc is formed with a second welding protrusion protruding toward the winding core side, and the second welding protrusion is connected with the positive electrode tab of the winding core by welding.

In any of the above embodiments, further, the second welding protrusion is a petal-shaped structure that gradually expands from the center of the positive electrode current collecting plate toward the edge thereof.

In any of the above embodiments, further, the number of the second welding protrusions is plural, and the second welding protrusions are uniformly spaced with the center of the positive electrode current collecting plate as the center.

In any of the above solutions, further, the size of the second liquid injection hole is smaller than or equal to the size of the first liquid injection hole.

In any of the above technical solutions, further, the single-pass cylindrical battery further includes a negative electrode cover plate assembly, the housing is of a structure with a hollow interior and an open top, and the negative electrode cover plate assembly is mounted at the open top of the housing.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides a novel structure of a single-pass cylindrical battery, a liquid injection hole and an explosion-proof valve at the top of a battery shell in the prior art are moved to the bottom of the shell, and the explosion-proof valve and the liquid injection hole are arranged corresponding to the center of a winding core, so that the liquid injection efficiency is improved, a wide pressure release channel is ensured, the drainage pressure is stable, the safety is higher, and the gas drained can be separated from electrical elements such as a plurality of buses at the top due to the fact that the explosion-proof valve is arranged at the bottom of the shell, namely, the electrical separation is realized, and the structure is safer and more reliable.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a single-pass cylindrical battery according to an embodiment of the present utility model;

fig. 2 is another schematic structural view of a single-pass cylindrical battery according to an embodiment of the present utility model;

fig. 3 is a schematic view of another structure of a single-pass cylindrical battery according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view taken along section A-A of FIG. 3;

FIG. 5 is an enlarged schematic view of FIG. 4 at C;

FIG. 6 is a cross-sectional view taken along section B-B of FIG. 3;

FIG. 7 is an enlarged schematic view of FIG. 6 at D;

fig. 8 is a schematic view of still another structure of a single-pass cylindrical battery according to an embodiment of the present utility model;

FIG. 9 is a cross-sectional view taken along section E-E of FIG. 8;

fig. 10 is an enlarged schematic view of the structure of fig. 9 at G;

FIG. 11 is a cross-sectional view taken along section F-F of FIG. 8;

fig. 12 is an enlarged schematic view of fig. 11 at H;

fig. 13 is a schematic structural view of a housing according to an embodiment of the present utility model;

FIG. 14 is a schematic view of another structure of a housing according to an embodiment of the present utility model;

fig. 15 is a schematic structural diagram of a positive current collecting plate according to an embodiment of the present utility model;

fig. 16 is another schematic structural view of a positive current collecting plate according to an embodiment of the present utility model;

FIG. 17 is a schematic view of a winding core according to an embodiment of the present utility model;

fig. 18 is an assembly schematic diagram of a winding core and a positive current collecting disc according to an embodiment of the present utility model.

Reference numerals:

the device comprises a 1-winding core, a 11-central hole, a 2-positive electrode current collecting disc, a 21-first welding boss, a 22-second welding boss, a 23-second liquid injection hole, a 24-positioning groove, a 3-shell, a 31-thickened part, a 32-mounting groove, a 321-first mounting groove, a 322-second mounting groove, a 33-first liquid injection hole, a 34-positioning pit, a 35-thinning pit, a 4-explosion-proof valve and a 5-negative electrode cover plate component.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.

The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships 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 devices 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A single pass cylindrical battery according to some embodiments of the present utility model is described below with reference to fig. 1 to 18.

Referring to fig. 1 to 18, an embodiment of the present utility model provides a single pass cylindrical battery including: a shell 3, a winding core 1, an explosion-proof valve 4 and a positive electrode current collecting disc 2; the positive electrode lug of the winding core 1 is connected with the positive electrode current collecting disc 2 to form a winding core 1 assembly; the winding core 1 assembly is arranged in the shell 3, and the bottom of the shell 3 along the height direction is connected with the positive electrode current collecting disc 2;

the shell 3 is provided with a mounting groove 32 and a first liquid injection hole 33, the positive electrode current collecting disc 2 is provided with a second liquid injection hole 23, and the mounting groove 32, the first liquid injection hole 33 and the second liquid injection hole 23 are sequentially communicated and are arranged corresponding to the central hole 11 of the winding core 1; the explosion-proof valve 4 is provided in the installation groove 32.

Based on the above-described structure, the utility model provides a novel structure of a single-pass cylindrical battery, wherein the liquid injection hole and the explosion-proof valve 4 at the top of the battery shell 3 in the prior art are moved to the bottom of the shell 3, and the explosion-proof valve 4 and the liquid injection hole are arranged corresponding to the center of the winding core 1, so that the liquid injection efficiency is improved, a wide pressure release channel is ensured, the drainage pressure is stable, the safety is higher, and the gas drained can be separated from electrical elements such as a plurality of buses at the top due to the fact that the explosion-proof valve 4 is arranged at the bottom of the shell 3, namely, the electrical separation is realized, and the novel structure is safer and more reliable.

Further, as shown in fig. 1 and 2, preferably, the casing 3 is a cylindrical casing 3, a mounting groove 32 and a first liquid injection hole 33 are arranged at the center of the bottom of the casing 3, the positive current collecting plate 2 is an adaptive disc, and a second liquid injection hole 23 is formed at the center of the positive current collecting plate and corresponds to the first liquid injection hole 33. Of course, the shapes of the case 3 and the positive electrode current collecting plate 2 are not limited to this, and may be adjusted according to actual needs, for example, a triangular prism, a quadrangular prism, a penta prism, a hexa prism, that is, a polygonal prism, and correspondingly, the shape of the positive electrode current collecting plate 2 is also adaptively adjusted.

Further, preferably, as shown in fig. 5 and 10, the explosion-proof valve 4 includes an explosion-proof sheet and a protection sheet, and correspondingly, the mounting groove 32 includes a first mounting groove 321 and a second mounting groove 322, which are sequentially provided, the first mounting groove 321 is used for mounting the explosion-proof sheet, the second mounting groove 322 is used for mounting the protection sheet, and the protection sheet is provided close to the outside.

Further, it is preferable that the housing 3 is made of a metal material such as an aluminum alloy, and is manufactured by a stamping process.

In this embodiment, preferably, as shown in fig. 5 and 10, the bottom of the housing 3 is formed with a thickened portion 31 protruding toward the inside thereof, the thickened portion 31 is formed with a mounting groove 32 and a first liquid injection hole 33, note that it is defined herein as a central region of the bottom of the housing 3, and the entire height h1 space from the outer wall to the inner wall is referred to as a thickened portion 31, not just a partial structure of height h2 protruding from the bottom of the housing 3.

According to the above-described structure, the mounting groove 32 and the first liquid injection hole 33 are formed at the center of the bottom of the housing 3 from outside to inside, so that the bottom needs to have a certain thickness to realize the operations of slotting and perforating, and the thickened portion 31 is formed at the position in the embodiment, so that the slotting and perforating structure is conveniently realized, and the position is ensured to have a certain strength.

In this embodiment, as shown in fig. 5 and 16, the positive electrode current collecting plate 2 is preferably formed with a positioning groove 24, and a thickened portion 31 is mounted to the positioning groove 24 for mounting and positioning.

In this embodiment, preferably, as shown in fig. 7 and 12, the positive electrode collector plate 2 is formed with a first welding boss 21, and the inner wall of the bottom of the case 3 is formed with a positioning recess 34, and the first welding boss 21 is fitted into the positioning recess 34.

According to the above-described structure, the first welding boss 21 is mounted in the positioning recess 34 to perform the function of welding positioning, thereby improving the welding accuracy and ensuring the yield.

In this embodiment, preferably, as shown in fig. 7 and 12, the outer wall of the bottom of the housing 3 is formed with a thinning dimple 35, and the thinning dimple 35 is disposed opposite to the positioning dimple 34.

According to the above-described structure, the thinning concave pit 35 is provided, that is, the specific position of the bottom of the casing 3 is thinned appropriately, which is helpful for realizing penetration welding of the casing 3 and the positive current collecting plate 2, and ensures stability and reliability of the welded structure.

Further, preferably, as shown in fig. 14, the first welding boss 21 has a circular boss structure, the positioning pit 34 has an adapted circular pit, and the thinning pit 35 may also be provided as a circular pit corresponding to the positioning pit 34, and has a simple structure, and is convenient for stamping.

In this embodiment, preferably, as shown in fig. 14, the number of the first welding protrusions 21 is plural, that is, a plurality of welding regions are formed, ensuring stability and reliability of the post-welding structure.

Further, preferably, as shown in fig. 1 to 3, the plurality of welding protrusions are uniformly distributed with the center of the winding core 1 as the center, so that the welding areas are uniformly distributed, and the quality after welding is improved.

In this embodiment, it is preferable that the positive electrode current collecting plate 2 is formed with a second welding protrusion 22 protruding toward the winding core 1 side, as shown in fig. 15 and 16, the second welding protrusion 22 being connected with the positive electrode tab of the winding core 1 by welding.

As is clear from the above-described structure, the provision of the second welding boss 22 enables compression and welding with the positive tab of the winding core 1.

Among them, the positive electrode current collecting plate 2 is preferably prepared by a punching process.

In this embodiment, it is preferable that the second welding boss 22 has a petal-like structure that is gradually widened toward the edge thereof with the center of the positive electrode current collecting plate 2, as shown in fig. 15 and 16.

According to the above-described structure, the second welding protrusions 22 are in the petal shape, which ensures a sufficient length and a sufficient width, that is, a length of the weld and the possibility of providing a plurality of welds, and improves welding quality.

Further, it is preferable that the number of the second welding protrusions 22 is plural and is uniformly spaced about the center of the positive electrode collector plate 2 as shown in fig. 15 and 16, so that the welding regions are more uniformly distributed.

In this embodiment, the size of the second liquid injection hole 23 is preferably equal to the size of the first liquid injection hole 33 as shown in fig. 5, and functions to protect the structure of the inner winding core 1 at the time of welding, but of course, not limited thereto, the following structure may be adopted: the second filling hole 23 has a smaller size than the first filling hole 33.

In this embodiment, preferably, as shown in fig. 2, the single-pass cylindrical battery further includes a negative electrode cap assembly 5, and the case 3 has a hollow structure with an open top, and the negative electrode cap assembly 5 is mounted at the open top of the case 3.

As can be seen from the above-described structure, the anode cover assembly 5 generally includes an anode post, an anode cover and an insulating member, which are assembled together, and then the anode cover is welded to the casing 3, which is a structure in the prior art, and will not be described in detail herein.

In summary, the single-pass cylindrical battery provided by the utility model is installed by the following steps:

preparation of winding core 1: cutting the tab into square or other shapes, winding and leveling to form a winding core 1;

welding the positive electrode current collecting disc 2: the petal-shaped boss, namely the second welding bulge 22 is tightly pressed with the lug of the winding core 1, concentricity (the second liquid passing hole of the positive electrode current collecting disc 2 is aligned with the central hole 11 of the winding core 1) is ensured, and then the positive electrode current collecting disc 2 and the positive electrode lug are welded at the petal-shaped pit of the positive electrode current collecting disc 2, namely the reverse side of the petal-shaped boss;

the roll core 1 is put into the shell: the circular boss of the positive electrode current collecting disc 2, namely the first welding bulge 21 is assembled in alignment with the circular pit at the bottom of the shell 3, namely the positioning pit 34, and the positioning groove 24 formed at the second liquid passing hole of the positive electrode current collecting disc 2 is tightly matched with the thickened part 31 at the bottom of the shell 3; the winding core 1 is pressed from the opening end, and the round pit, namely the thinned pit 35, is penetrated and welded from the outer side of the bottom of the shell 3 to communicate with the anode, so that the penetration and welding difficulty is lower and the efficiency is higher due to the design of the inner pit and the outer pit of the shell 3;

welding a negative electrode current collecting disc;

the connecting piece of the negative electrode collecting disc is bent, and the upper cover plate, namely the negative electrode cover plate, is assembled with the opening end of the shell 3;

after the upper cover plate, namely the negative electrode cover plate, is tightly pressed with the shell 3, the outer peripheral ring is welded by laser, so that the sealing is realized;

and (3) liquid injection: the battery is inverted, liquid is injected from the central hole 11 at the bottom of the shell 3 to the inner side, the liquid injection is smoother due to the alignment of the central hole 11 of the winding core 1, and the electrolyte is uniformly diffused to the pole pieces from the periphery, so that the efficiency is higher;

cleaning a liquid injection hole: the electrolyte remained near the first liquid injection hole 33 at the bottom of the laser cleaning shell 3;

welding of the rupture disc, i.e. the rupture valve 4: the second liquid injection hole 23 of the positive current collecting disc 2 is smaller than or equal to the first liquid injection hole at the bottom of the shell 3, and plays a role in protecting the structure of the internal winding core 1 during welding.

Therefore, the single-pass cylindrical battery provided by the utility model has the advantages of simple structure, convenience in assembly and the following advantages;

the liquid injection hole, namely the first liquid injection hole 33 is arranged in the center of the bottom of the shell 3 and is aligned with the center hole 11 of the winding core 1, so that the liquid injection efficiency is higher;

a thickening layer is arranged at the bottom of the shell 3, so that an installation position is provided for installing the explosion-proof valve 4 and forming a liquid injection hole, namely a first liquid injection hole 33, and the overall space utilization rate is improved;

the explosion-proof valve 4 is arranged at the bottom of the shell 3, so that the electric separation of the single-pass battery structure is realized, and meanwhile, the central hole 11 of the winding core 1 provides a stable airflow channel for detonation and pressure relief, so that the stability and the safety performance of the battery are improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A single pass cylindrical battery comprising: the device comprises a winding core, an anode current collecting disc, a shell and an explosion-proof valve; the positive electrode lug of the winding core is connected with the positive electrode current collecting disc to form a winding core assembly; the winding core component is arranged in the shell, and the bottom of the shell along the height direction of the winding core component is connected with the positive electrode current collecting disc;

the shell is provided with a mounting groove and a first liquid injection hole, the positive electrode current collecting disc is provided with a second liquid injection hole, and the mounting groove, the first liquid injection hole and the second liquid injection hole are sequentially communicated and are arranged corresponding to the central hole of the winding core; the explosion-proof valve is arranged in the mounting groove.

2. The single-pass cylindrical battery according to claim 1, wherein a thickened portion protruding toward the inside thereof is formed at the bottom of the case, and the thickened portion is formed with the mounting groove and the first liquid injection hole.

3. The single pass cylindrical battery according to claim 2, wherein the positive electrode collector plate is formed with a positioning groove, and the thickened portion is mounted to the positioning groove.

4. The single pass cylindrical battery according to claim 1, wherein the positive electrode collector plate is formed with a first welding protrusion, and an inner wall of a bottom of the case is formed with a positioning recess, and the first welding protrusion is mounted in the positioning recess.

5. The single pass cylindrical battery according to claim 4, wherein the outer wall of the bottom of the case is formed with a thinning recess, and the thinning recess is disposed opposite to the positioning recess.

6. The single pass cylindrical battery according to claim 4, wherein the number of the first welding protrusions is plural.

7. The single pass cylindrical battery according to claim 6, wherein a plurality of said welding protrusions are uniformly distributed centering on the center of said winding core.

8. The single pass cylindrical battery according to claim 1, wherein the positive electrode collector plate is formed with a second welding boss protruding toward the winding core side, the second welding boss being connected to the positive electrode tab of the winding core by welding.

9. The single pass cylindrical battery according to claim 8, wherein said second welding protrusion has a petal-like structure that diverges toward the edge thereof with the center of said positive electrode current collecting plate; and/or

The number of the second welding convex parts is multiple, and the second welding convex parts are uniformly arranged at intervals by taking the center of the positive electrode current collecting disc as the center.

10. The single pass cylindrical battery of any one of claims 1-9, wherein the size of the second fluid injection hole is smaller than or equal to the size of the first fluid injection hole;

and/or, the single-pass cylindrical battery further comprises a negative electrode cover plate assembly, the shell is of a structure with a hollow inside and an open top, and the negative electrode cover plate assembly is installed at the open top of the shell.