CN219575767U - Cylindrical battery and battery module - Google Patents

Abstract

The utility model provides a cylindrical battery and a battery module, and relates to the technical field of batteries. Therefore, the number of parts of the cylindrical battery is reduced, the processing technology is simplified, and the production cost is correspondingly reduced.

Description

Cylindrical battery and battery module

Technical Field

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

Background

Currently, a cylindrical battery is generally provided with an opening at one end and an opening at the other end in the middle of the end face. The positive electrode end and the negative electrode end of the electrode group are respectively welded with a current collecting disc, and the current collecting disc positioned at the positive electrode end is welded with the positive electrode post. When the cylindrical battery is assembled, the pole group is inserted into the shell from the opening end, the positive pole column extends out of the shell from the opening, and the current collecting disc at the negative pole end is welded with the shell.

However, since the positive electrode post needs to be fastened on the housing and the housing needs to form a sealing space, the positive electrode post and the housing need to be connected by a connecting portion, the positive electrode post needs to be fixed by riveting, welding and other processes, and structures such as a sealing gasket, an insulating piece and the like need to be arranged to seal two ends of the housing, so that the number of parts of the cylindrical battery is large, the processing process is complex, and the production cost is high.

Disclosure of Invention

The utility model solves the problems of reducing the number of parts of the cylindrical battery, simplifying the processing technology and reducing the production cost.

In order to solve the above problems, the present utility model provides a cylindrical battery, which includes a housing, a pole group, a cover plate structure and an insulating structure, wherein two opposite ends of the housing are an open end and a closed end, the pole group is disposed in the housing, a negative end of the pole group is connected with the closed end, an annular rolling groove structure recessed inward along a radial direction is formed on an outer wall of the housing, so that the pole group is clamped between the annular rolling groove structure and the closed end, the cover plate structure is disposed at the open end, the open end has an annular edge structure, the annular edge structure is folded inward along a radial direction, so that the cover plate structure is clamped between the annular edge structure and the annular rolling groove structure, the cover plate structure is connected with a positive end of the pole group, the cover plate structure protrudes towards a direction away from the pole group to form a protruding structure, and the insulating structure is disposed between the cover plate structure and the housing.

The utility model has the technical effects that: the opposite ends of the shell of the cylindrical battery are an open end and a closed end respectively, namely one end of the shell is of an open structure, the other end of the shell is of a closed structure, the annular edge structure can be inserted into the shell from the open end, the negative end of the pole group can be connected with the closed end of the shell, a circle of annular rolling groove structure which is concave inwards along the radial direction can be formed after the rolling groove is processed on the outer wall of the shell, so that the pole group is clamped between the annular rolling groove structure and the closed end, the pole group can be fastened in the shell, the cover plate structure can be arranged at the open end, and the cover plate structure is positioned at one side of the annular rolling groove structure, far away from the pole group, the open end can be provided with an annular edge structure, during processing, the annular edge structure can be folded along the radial direction, so that the cover plate structure is clamped between the annular edge structure and the annular rolling groove structure, namely the cover plate structure is fixed on the shell, and the cover plate structure can be connected with the positive end of the pole group, the cover plate structure protrudes towards the direction far away from the pole group to form a protruding structure, and the protruding structure can be equivalent to a positive post, so that the positive post can be fastened on the shell, the cover plate structure can be fastened between the shell and the shell, the shell and the shell can also be sealed with the shell, and the insulating structure can be sealed, and the insulating structure can be processed. Therefore, the cylindrical battery cancels the current collecting disc, the protruding structure can serve as the positive pole, the protruding structure can be obtained by integrally stamping and forming the cover plate structure, additional parts are not required to be arranged for fixing the protruding structure, the number of parts of the cylindrical battery can be reduced, meanwhile, the negative pole of the cylindrical battery is of a closed structure, the cylindrical battery is not required to be closed through later edging or welding, the welding times are reduced, the processing technology is further simplified, and the production cost is correspondingly reduced.

Preferably, the cover plate structure comprises a cover plate body and a connecting piece, the cover plate body is arranged at the opening end, the cover plate body is clamped between the annular edge structure and the annular rolling groove structure, the cover plate body protrudes towards the direction away from the pole group to form the protruding structure, and the connecting piece is connected with the cover plate body and the pole group.

Preferably, the cylindrical battery further comprises a sealing structure, the cover plate body is provided with a liquid injection port, the liquid injection port is communicated with the inside of the shell, and the sealing structure is installed at the liquid injection port.

Preferably, the sealing structure comprises a liquid injection cover and a sealing piece, the liquid injection cover is mounted on the cover plate body, the liquid injection cover is provided with a through hole communicated with the liquid injection port, and the sealing piece is used for being inserted into the through hole and the liquid injection port.

Preferably, the connecting piece is including a plurality of linkage segments of buckling in proper order and connecting, and is a plurality of the linkage segment all is equipped with the connecting hole, and is a plurality of the connecting hole all with annotate the coaxial setting of liquid mouth, the sealing member is used for inserting in proper order locating the through-hole annotate liquid mouth and a plurality of in the connecting hole.

Preferably, the insulating structure comprises an insulating member disposed between the annular rim structure and the cover plate structure, and the insulating member extends along the inner wall of the housing between the cover plate structure and the annular rolling groove structure.

Preferably, the insulator also extends between the annular rolling groove structure and the pole group.

Preferably, the insulation structure further comprises a first insulation film, the first insulation film is covered on the positive electrode end of the electrode group, and the first insulation film is connected with the insulation piece.

Preferably, the insulation structure further comprises a second insulation film, the second insulation film is sleeved on the circumferential side wall of the pole group, and the second insulation film extends to be connected with the first insulation film along the axial direction of the pole group.

The utility model also provides a battery module which comprises a plurality of cylindrical batteries.

The battery module has the same beneficial effects as the cylindrical battery, and is not repeated here.

Drawings

Fig. 1 is a schematic diagram of a split structure of parts of a cylindrical battery according to an embodiment of the present utility model;

fig. 2 is a schematic cross-sectional structure of a cylindrical battery according to an embodiment of the present utility model.

Reference numerals illustrate:

1. a housing; 11. an open end; 12. a closed end; 13. an annular rolling groove structure; 14. an annular edge structure; 2. a pole group; 21. a positive terminal; 22. a negative terminal; 3. a cover plate structure; 31. a cover plate body; 311. a bump structure; 312. a liquid injection port; 32. a connecting piece; 321. a connection section; 322. a connection hole; 4. an insulating structure; 41. an insulating member; 42. a first insulating film; 43. a second insulating film; 5. a sealing structure; 51. a liquid injection cover; 511. a through hole; 52. and a seal.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

Referring to fig. 1 and 2, a cylindrical battery according to an embodiment of the present utility model includes a casing 1, a pole group 2, a cover plate structure 3 and an insulating structure 4, where opposite ends of the casing 1 are an open end 11 and a closed end 12, the pole group 2 is disposed in the casing 1, and a negative end 22 of the pole group 2 is connected with the closed end 12, an outer wall of the casing 1 forms a ring-shaped rolling groove structure 13 that is concave inward in a radial direction, so that the pole group 2 is sandwiched between the ring-shaped rolling groove structure 13 and the closed end 12, the cover plate structure 3 is disposed at the open end 11, and the open end 11 has a ring-shaped edge structure 14, the ring-shaped edge structure 14 is folded inward in a radial direction, so that the cover plate structure 3 is sandwiched between the ring-shaped edge structure 14 and the ring-shaped rolling groove structure 13, the cover plate structure 3 is connected with a positive end 21 of the pole group 2, and the cover plate structure 3 protrudes in a direction away from the pole group 2 to form a protruding structure 311, and the cover plate structure 3 is disposed between the casing 1 and the insulating structure 4.

Specifically, the cylindrical battery may include a case 1, a pole group 2, a cover structure 3, and an insulating structure 4, the case 1 has a cylindrical shape, and opposite ends of the case 1 are an open end 11 and a closed end 12, respectively, that is, one end of the case 1 has an open structure and the other end has a closed structure. The shape of the pole group 2 is a cylindrical structure, the radial dimension of the pole group 2 can be matched with the inner diameter dimension of the shell 1, that is, the radial dimension of the pole group 2 is equal to or slightly smaller than the inner diameter dimension of the shell 1, so that the pole group 2 can be just inserted into the shell 1 from the open end 11 of the shell 1, and the negative end 22 of the pole group 2 can be welded and fixed with the closed end 12 of the shell 1.

When the pole group 2 is disposed inside the casing 1, the outer wall of the casing 1 may be grooved using a channeling machine so that the casing 1 forms a ring of annular channeling structure 13 that is concave in the radial direction, more specifically, the position where the channeling is performed is located on the outer surface of the casing 1, and when the annular channeling structure 13 is formed, the pole group 2 may be sandwiched between the annular channeling structure 13 and the closed end 12, so that the pole group 2 may be fastened inside the casing 1.

The cover plate structure 3 may be provided at the open end 11 and the cover plate structure 3 may be located at a side of the annular rolling groove structure 13 remote from the pole group 2, i.e. the cover plate structure 3 may be pressed onto the annular rolling groove structure 13 when assembling the cylindrical battery. The opening end 11 may have an annular edge structure 14, and during processing, the annular edge structure 14 may be turned over radially towards the inside of the housing 1, so that the annular edge structure 14 is pressed against the cover structure 3, so that the cover structure 3 may be sandwiched between the annular edge structure 14 and the annular rolling groove structure 13, i.e. the cover structure 3 is fixed on the housing 1.

And the cover plate structure 3 may be connected to the positive electrode 21 of the electrode group 2, and the cover plate structure 3 may protrude in a direction away from the electrode group 2 to form a protrusion structure 311, preferably, the protrusion structure 311 is an annular protrusion, and the protrusion structure 311 may correspond to a positive electrode post, so that the positive electrode post may be fastened to the housing 1. The insulating structure 4 may be provided between the cover structure 3 and the housing 1 such that the cover structure 3 may seal the open end 11 of the housing 1 and may also insulate the cover structure 3 from the housing 1.

Therefore, the above-mentioned cylindrical battery has cancelled the current collecting tray to protruding structure 311 can act as the positive pole, and protruding structure 311 can be obtained by the integrative stamping forming of apron structure 3, need not to set up extra spare part and go fixed protruding structure 311, can reduce the spare part quantity of cylindrical battery, and the negative pole of cylindrical battery is closed structure simultaneously, need not to seal through later stage edging or welding, and the welding number of times has reduced, and then has simplified processing technology, and manufacturing cost has also reduced correspondingly.

Referring to fig. 1, in some embodiments, the cover structure 3 includes a cover body 31 and a connecting member 32, the cover body 31 is disposed at the open end 11, the cover body 31 is sandwiched between the annular edge structure 14 and the annular rolling groove structure 13, the cover body 31 protrudes away from the pole group 2 to form the protruding structure 311, and the connecting member 32 connects the cover body 31 and the pole group 2.

Specifically, the cover structure 3 may include a cover body 31 and a connector 32, the cover body 31 is in a disc-shaped structure, and a radial dimension of the cover body 31 matches an inner diameter dimension of the housing 1. The cover plate body 31 may be disposed at the open end 11, i.e. the cover plate body 31 may be pressed onto the annular rolling groove structure 13, and the annular rim structure 14 may be folded radially inwards of the housing 1, such that the cover plate body 31 is sandwiched between the annular rim structure 14 and the annular rolling groove structure 13, thereby fixing the cover plate body 31 to the housing 1.

The cover plate body 31 can be protruded in the direction away from the pole group 2 to form a protruding structure 311, the connecting piece 32 can be arranged between the cover plate body 31 and the pole group 2, one end of the connecting piece 32 can be welded with the cover plate body 31, the other end of the connecting piece 32 can be welded with the positive pole end 21 of the pole group 2, and the cover plate body 31 can be connected with the positive pole end 21 of the pole group 2, so that the protruding structure 311 can serve as a positive pole.

Referring to fig. 1 and 2, in some embodiments, the cylindrical battery further includes a sealing structure 5, the cap plate body 31 is provided with a liquid filling port 312, the liquid filling port 312 communicates with the interior of the housing 1, and the sealing structure 5 is mounted on the liquid filling port 312.

Specifically, the cylindrical battery may further include a sealing structure 5, the cover plate body 31 may be provided with a liquid injection port 312, the liquid injection port 312 may be communicated with the interior of the casing 1, so that electrolyte may be injected into the casing 1 through the liquid injection port 312, the sealing structure 5 may be mounted at the liquid injection port 312, when the electrolyte needs to be injected into the casing 1, the sealing structure 5 may be detached from the liquid injection port 312, the electrolyte may be injected into the casing 1 through the liquid injection port 312, and after the liquid injection is completed, the sealing structure 5 may be mounted at the liquid injection port 312, so that the opening end 11 of the casing 1 may maintain a sealing state.

Referring to fig. 1 and 2, in some embodiments, the sealing structure 5 includes a liquid injection cover 51 and a sealing member 52, the liquid injection cover 51 is mounted on the cover plate body 31, the liquid injection cover 51 is provided with a through hole 511 communicating with the liquid injection port 312, and the sealing member 52 is configured to be inserted into the through hole 511 and the liquid injection port 312.

Specifically, the sealing structure 5 may include a liquid injection cover 51 and a sealing member 52, in this embodiment, the cover plate body 31 may be provided with a receiving groove matched with the liquid injection cover 51 at the liquid injection opening 312, the bottom of the receiving groove may be communicated with the liquid injection opening 312, the liquid injection cover 51 may be installed in the receiving groove, and the liquid injection cover 51 may be provided with a through hole 511, the through hole 511 may be communicated with the liquid injection opening 312, preferably, the through hole 511 may be coaxially arranged with the liquid injection opening 312, the sealing member 52 may be used for being inserted into the through hole 511 and the liquid injection opening 312, i.e., the sealing member 52 may be used for sealing the through hole 511 and the liquid injection opening 312, so that the open end 11 of the casing 1 may be kept in a sealed state, in this embodiment, the sealing member 52 may be a sealing nail, and the sealing member 52 may be conveniently inserted into the through hole 511 and the liquid injection opening 312.

Referring to fig. 1 and 2, in some embodiments, the connecting member 32 includes a plurality of connecting sections 321 that are sequentially bent and connected, a plurality of connecting holes 322 are respectively provided on the connecting sections 321, a plurality of connecting holes 322 are respectively coaxially disposed with the liquid filling port 312, and the sealing member 52 is configured to be sequentially inserted into the through hole 511, the liquid filling port 312, and a plurality of connecting holes 322.

Specifically, the connecting piece 32 may be made of soft metal materials, and the connecting piece 32 may be sequentially bent to form a plurality of connecting sections 321, in this embodiment, the connecting piece 32 may be bent to form three connecting sections 321, the three connecting sections 321 are sequentially connected to form a structure similar to a Z shape, the plurality of connecting sections 321 may be provided with connecting holes 322, the plurality of connecting holes 322 may be coaxially arranged with the liquid injection port 312, and when the sealing piece 52 is inserted into the through hole 511 and the liquid injection port 312, the sealing piece 52 may be sequentially inserted into the plurality of connecting holes 322, so that the sealing piece 52 may be more stably inserted into the liquid injection port 312, and loosening of the sealing piece 52 may be avoided.

Referring to fig. 1 and 2, in some embodiments, the insulating structure 4 includes an insulating member 41, the insulating member 41 is disposed between the annular rim structure 14 and the cover plate structure 3, and the insulating member 41 extends along the inner wall of the housing 1 to between the cover plate structure 3 and the annular rolling groove structure 13.

Specifically, the insulating structure 4 may include an insulating member 41, in this embodiment, the insulating member 41 may be in a cylindrical-like structure, in this embodiment, the insulating member 41 may be sleeved on the cover plate body 31, and the cover plate body 31 may be disposed between the cover plate body 31 and the housing 1, when the annular rim structure 14 is folded radially inward of the housing 1, the annular rim structure 14 may drive the insulating member 41 to fold inward of the housing 1, so that the insulating member 41 may be partially located between the annular rim structure 14 and the cover plate body 31, and another portion of the insulating member 41 may extend along an inner side wall of the housing 1 between the cover plate body 31 and the annular rolling groove structure 13, so that the insulating member 41 may seal the open end 11 of the housing 1, and the insulating member 41 may perform an insulating process between the cover plate body 31 and the housing 1.

Referring to fig. 2, in some embodiments, the insulator 41 also extends between the annular rolling groove structure 13 and the pole set 2.

Specifically, the insulating member 41 may further extend along the inner side wall of the housing 1 in a direction approaching the pole group 2 between the annular rolling groove structure 13 and the pole group 2, more clearly, before the rolling groove is performed, the insulating member 41 may be sleeved on the cover plate body 31, and the insulating member 41 is disposed between the housing 1 and the cover plate body 31, and the insulating member 41 may extend along the inner side wall of the housing 1 to be in contact with the positive electrode end 21 of the pole group 2, when the outer surface of the housing 1 is subjected to the rolling groove processing, the annular rolling groove structure 13 recessed in a radial direction may be formed on the outer surface of the housing 1, and the insulating member 41 may be extruded during the recessing process, so that the insulating member 41 is located between the annular rolling groove structure 13 and the pole group 2, and thus the insulating member 41 may further perform an insulating treatment on the positive electrode end 21 of the pole group 2 and the inner side wall of the housing 1, and may further enhance the sealing property of the open end 11 of the housing 1.

Referring to fig. 1, in some embodiments, the insulation structure 4 further includes a first insulation film 42, where the first insulation film 42 covers the positive electrode terminal 21 of the electrode group 2, and the first insulation film 42 is connected to the insulation member 41.

Specifically, the insulating structure 4 may further include a first insulating film 42, the first insulating film 42 may be a ring-shaped structure, and the first insulating film 42 may be covered on the positive electrode terminal 21 of the electrode group 2. More specifically, the first insulating film 42 has a ring structure with a circular hole in the middle, when the first insulating film 42 covers the positive electrode terminal 21 of the electrode group 2, the positive electrode terminal 21 is partially exposed, so that the connecting member 32 can be welded with the positive electrode terminal 21, and the first insulating film 42 extends along the axial direction of the electrode group 2 toward the negative electrode terminal 22 near the electrode group 2, and the first insulating film 42 can be connected with the insulating member 41, so that the positive electrode terminal 21 of the electrode group 2 can be further insulated from the inner side wall of the housing 1.

Referring to fig. 1, in some embodiments, the insulation structure 4 further includes a second insulation film 43, where the second insulation film 43 is sleeved on the circumferential sidewall of the pole group 2, and the second insulation film 43 extends along the axial direction of the pole group 2 to be connected with the first insulation film 42.

Specifically, the insulating structure 4 may further include a second insulating film 43, the second insulating film 43 may be a cylindrical structure, the second insulating film 43 may be sleeved on the circumferential side wall of the pole group 2, and the second insulating film 43 may be disposed to extend in the axial direction of the pole group 2, one end of the second insulating film 43 may extend to be connected with the first insulating film 42, and the other end of the second insulating film 43 may extend to the negative electrode end 22 of the pole group 2, so that the second insulating film 43 may perform an insulating process between the circumferential side wall of the pole group 2 and the inner side wall of the case 1.

Another embodiment of the present utility model provides a battery module including a plurality of cylindrical batteries as described above.

The battery module and the cylindrical battery in this embodiment have the same or similar embodiments and beneficial effects based on the same inventive concept, and are not described herein.

Although the utility model is disclosed above, the scope of the utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the scope of the utility model.

Claims (10)

1. The utility model provides a cylinder battery, its characterized in that includes casing (1), utmost point group (2), apron structure (3) and insulation structure (4), the opposite both ends of casing (1) are open end (11) and closed end (12) respectively, utmost point group (2) set up in casing (1), just negative pole end (22) of utmost point group (2) with closed end (12) are connected, the outer wall of casing (1) forms along radial concave annular rolling groove structure (13), so that utmost point group (2) clamp locates annular rolling groove structure (13) with between closed end (12), apron structure (3) set up in open end (11), just open end (11) have annular limit structure (14), annular limit structure (14) are along radial inward turn over, so that apron structure (3) clamp locates annular limit structure (14) with between closed end (13), apron structure (3) with the positive end (21) of utmost point group (2) are located in between the apron structure (3) and the apron structure (3) are kept away from in the protruding structure (311).

2. The cylindrical battery according to claim 1, wherein the cover plate structure (3) comprises a cover plate body (31) and a connecting piece (32), the cover plate body (31) is arranged at the open end (11), the cover plate body (31) is clamped between the annular edge structure (14) and the annular rolling groove structure (13), the cover plate body (31) protrudes towards a direction away from the pole group (2) to form the protruding structure (311), and the connecting piece (32) connects the cover plate body (31) and the pole group (2).

3. The cylindrical battery according to claim 2, further comprising a sealing structure (5), wherein the cap plate body (31) is provided with a liquid injection port (312), the liquid injection port (312) communicates with the inside of the housing (1), and the sealing structure (5) is mounted to the liquid injection port (312).

4. A cylindrical battery according to claim 3, wherein the sealing structure (5) comprises a liquid injection cover (51) and a sealing member (52), the liquid injection cover (51) is mounted on the cover plate body (31), the liquid injection cover (51) is provided with a through hole (511) communicated with the liquid injection port (312), and the sealing member (52) is used for being inserted into the through hole (511) and the liquid injection port (312).

5. The cylindrical battery according to claim 4, wherein the connecting member (32) comprises a plurality of connecting sections (321) which are sequentially bent and connected, a plurality of connecting holes (322) are respectively formed in the connecting sections (321), the connecting holes (322) are respectively coaxially arranged with the liquid injection port (312), and the sealing member (52) is sequentially inserted into the through hole (511), the liquid injection port (312) and the connecting holes (322).

6. The cylindrical battery according to claim 1, characterized in that the insulating structure (4) comprises an insulating member (41), the insulating member (41) being arranged between the annular rim structure (14) and the cover structure (3), and the insulating member (41) extending along the inner wall of the housing (1) to between the cover structure (3) and the annular rolling groove structure (13).

7. Cylindrical battery according to claim 6, characterized in that the insulation (41) also extends between the annular rolling groove structure (13) and the pole group (2).

8. The cylindrical battery according to claim 6, wherein the insulating structure (4) further comprises a first insulating film (42), the first insulating film (42) is covered on the positive electrode end (21) of the electrode group (2), and the first insulating film (42) is connected with the insulating member (41).

9. The cylindrical battery according to claim 8, wherein the insulating structure (4) further comprises a second insulating film (43), the second insulating film (43) is sleeved on the circumferential side wall of the pole group (2), and the second insulating film (43) extends along the axial direction of the pole group (2) to be connected with the first insulating film (42).

10. A battery module comprising a plurality of cylindrical batteries according to any one of claims 1 to 9.