CN220021514U - Cylindrical battery, battery module and electric equipment - Google Patents

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a cylindrical battery, a battery module and electric equipment, wherein the cylindrical battery comprises a shell, a battery core and a first current collecting member, the battery core and the first current collecting member are arranged in the shell, the first current collecting member comprises a first main body part and a welding part, and the welding part protrudes out of the peripheral edge of the first main body part along the thickness direction of the first current collecting member; the first main body part is welded with the lug of the battery cell, and the welding part is inserted into a gap between the side wall of the shell and the battery cell and is welded with the side wall of the shell; the welding positions of the bottom wall of the cover plate or the shell and the lugs on the current collecting member are effectively prevented from being identical, so that the current collecting member is prevented from being welded through due to the identical welding positions, the battery core is effectively prevented from being damaged, and the overcurrent capacity and the safety of the battery are improved.

Description

Cylindrical battery, battery module and electric equipment

Technical Field

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a cylindrical battery, a battery module and electric equipment.

Background

The lithium ion battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large energy storage, electric traffic power sources and the like.

At present, when the current collecting member of the battery is welded, the welding positions of the bottom or the cover cap of the shell and the tab on the current collecting member are the same, so that the current collecting member is welded through, and the battery cell is damaged.

Disclosure of Invention

One of the objects of the present utility model is: the cylindrical battery is provided to solve the technical problem that the welding positions of the bottom or the cap of the shell and the tab on the current collecting member are the same in the prior art, so that the current collecting member is welded through.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the cylindrical battery comprises a shell, a battery core and a first current collecting member, wherein the battery core and the first current collecting member are arranged in the shell, the first current collecting member comprises a first main body part and a welding part, and the welding part protrudes out of the peripheral edge of the first main body part along the thickness direction of the first current collecting member;

the first main body part is welded with the lug of the battery cell, and the welding part is inserted into a gap between the side wall of the shell and the battery cell and is welded with the side wall of the shell.

Preferably, the first current collecting member further includes a limiting portion, the first body portion is provided with a first through hole corresponding to the position of the central hole of the battery cell, and the limiting portion is disposed at the edge of the first through hole and is inserted into the central hole of the battery cell.

Preferably, the first main body portion is provided with a plurality of second through holes, and a plurality of second through holes are arranged around the first through holes at equal intervals.

Preferably, the outer peripheral edge of the first body portion is provided with a notch.

Preferably, the casing includes a housing and a cap, the cap seals the opening of the housing and forms an accommodating space with the housing, the battery cell and the first current collecting member are disposed in the accommodating space, and the battery cell includes a first tab electrically connected with the first body portion.

Preferably, the battery cell further comprises an electrode leading-out terminal, wherein a mounting hole is formed in one end, facing away from the cap, of the shell, the electrode leading-out terminal is mounted in the mounting hole in an insulating and sealing mode, the battery cell further comprises a second lug with the polarity opposite to that of the first lug, and the second lug is electrically connected with the electrode leading-out terminal.

Preferably, a second current collecting member is connected between the second lug and the electrode lead-out terminal, the second current collecting member comprises a second main body part and a conductive handle, the second main body part is welded with the second lug, the second main body part is provided with a third through hole corresponding to the position of the central hole of the battery cell, one end of the conductive handle is connected with the edge of the third through hole, and the other end of the conductive handle is connected with the electrode lead-out terminal.

Preferably, a plurality of fourth through holes are formed in the second main body portion, and the fourth through holes are arranged around the third through holes at equal intervals.

Another object of the utility model is: there is provided a battery module including a case and a cylindrical battery as described in the foregoing description, the battery being disposed in the case.

Yet another object of the present utility model is: there is provided an electric device including a battery module as described in the foregoing description.

The cylindrical battery has the beneficial effects that through the cooperation of the shell, the battery core and the first current collecting member, the first current collecting member comprises the first main body part and the welding part, the welding part protrudes out of the peripheral edge of the first main body part along the thickness direction of the current collecting member, the first main body part is used for being connected with the tab of the battery core, the welding part is used for being welded with the side wall of the shell, and the welding positions of the bottom wall of the cover plate or the shell and the tab on the current collecting member are effectively prevented from being identical, so that the current collecting member is prevented from being welded through due to the identical welding positions, the battery core is effectively prevented from being damaged, and the overcurrent capacity and the safety of the battery are improved. Simultaneously, the welding part protrudes out of the peripheral edge of the first main body part along the thickness direction of the first current collecting member, the welding part is inserted into a gap between the battery cell and the shell, and the battery cell can compress the welding part, so that the welding part is attached to the side wall of the shell, and the welding rate of the side wall of the shell and the welding part is improved.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the present utility model.

Fig. 2 is an enlarged schematic view of the structure at a in fig. 1.

Fig. 3 is an enlarged schematic view of the structure at B in fig. 1.

Fig. 4 is a schematic structural view of a first current collecting member according to the present utility model.

Fig. 5 is a schematic structural view of a second current collecting member according to the present utility model.

Wherein reference numerals are as follows:

100. a battery;

10. a housing; 11. a sidewall; 12. a bottom wall; 13. a mounting hole; 14. a hemming portion; 15. a crimping part;

20. capping;

30. a battery cell; 31. a first tab; 32. a second lug; 33. a central bore;

40. a first current collecting member; 41. a first body portion; 411. a first through hole; 412. a second through hole; 413. a notch; 414. welding marks; 42. a welding part; 43. a limit part;

50. a second current collecting member; 51. a second body portion; 511. a third through hole; 512. a fourth through hole; 52. a conductive handle;

60. an electrode lead-out terminal;

70. a first insulating member;

80. a second insulating member;

90. and a liquid injection hole.

Detailed Description

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 can be understood by those of ordinary skill in the art according to the specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 5, but the present utility model is not limited thereto.

The electric equipment provided by the embodiment of the utility model comprises a battery module. The electric equipment can be an automobile, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The automobile can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the utility model does not limit the electric equipment in particular.

The battery module of the embodiment of the utility model comprises a box body and a battery 100, wherein the battery 100 is arranged in the box body.

In some embodiments, the case includes a first portion and a second portion that are mutually covered with a cavity formed therebetween for accommodating the battery 100. Specifically, the first part may be a hollow structure with one end open, the second part is a plate-shaped structure, and the second part covers the open side of the first part to form a box body with a cavity; the first portion and the second portion may each be hollow structures that are sequentially open, with the open side of the first portion and the open side of the second portion overlapping one another to form a case having a cavity.

The number of the battery 100 may be one or a plurality of. If there are multiple batteries 100, the multiple batteries 100 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series and parallel connection among the multiple batteries 100. The batteries 100 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the batteries 100 is accommodated in the box body; of course, a plurality of batteries 100 may be connected in series or parallel or in series to form a battery 100 module, and then the plurality of battery 100 modules may be connected in series or parallel or in series to form a whole and be accommodated in the case.

Referring to fig. 1 to 5, a cylindrical battery 100 according to an embodiment of the present utility model includes a case, a battery cell 30, and a first current collecting member 40, the battery cell 30 and the first current collecting member 40 being disposed in the case, the first current collecting member including a first body portion 41 and a welded portion 42, the welded portion 42 protruding from an outer peripheral edge of the first body portion 41 in a thickness direction of the first current collecting member 40; the first body 41 is welded to the tab of the battery cell 30, and the welding portion 42 is inserted into a gap between the side wall 11 of the case and the battery cell 30, and is welded to the side wall 11 of the case.

Compared with the prior art, the cylindrical battery 100 according to the embodiment of the utility model uses the shell, the battery cell 30 and the first current collecting member 40 in a matching manner, the first current collecting member 40 comprises the first main body and the welding part 42, the welding part 42 protrudes out of the outer peripheral edge of the first main body 41 along the thickness direction of the current collecting member 40, the first main body 41 is used for being connected with the tab of the battery cell 30, the welding part 42 is used for being welded with the side wall 11 of the shell 10, and the welding positions of the bottom wall 12 of the cover plate or the shell 10 and the tab on the current collecting member 40 are effectively prevented from being the same, so that the current collecting member 40 is prevented from being welded through due to the same welding positions, the battery cell 30 is effectively prevented from being damaged, and the overcurrent capacity and the safety of the battery 100 are improved. Meanwhile, the welding portion 42 protrudes from the outer circumferential edge of the first body portion 41 in the thickness direction of the first current collecting member 40, the welding portion 42 is inserted into a gap between the battery cell 30 and the case, and the battery cell 30 may press the welding portion 42 such that the welding portion 42 is attached to the side wall 11 of the case, thereby improving welding quality of the side wall 11 of the case and the welding portion 42.

The shell of the embodiment of the utility model comprises a shell 10 and a cap 20, wherein the cap 20 seals an opening of the shell 10, an accommodating space is formed between the cap and the shell 10, and the battery cell 30 and the first current collecting member 40 are arranged in the accommodating space.

Therefore, the battery cell 30 can be connected with the shell 10 or the cap 20 through the first current collecting member, and the connection difficulty between the battery cell 30 and the bottom wall 12 of the shell 10 can be well reduced. In addition, the battery cell 30 and the first current collecting member 40 can be subjected to assembly procedures such as welding and the like outside the shell 10, so that the assembly difficulty between the battery cell 30 and the first current collecting member 40 is effectively reduced.

Referring to fig. 2, the first current collecting member 40 according to the embodiment of the present utility model further includes a limiting portion 43, the first body portion 41 is provided with a first through hole 411 corresponding to the position of the central hole 33 of the battery cell 30, and the limiting portion 43 is disposed at an edge of the first through hole 411 and is inserted into the central hole 33 of the battery cell 30. Through the arrangement of the first through holes 411, the first through holes 411 correspond to the central holes 33 of the battery cells 30, and the first through holes 411 can accommodate electrolyte to pass through and assist the circulation of the electrolyte. The limiting part 43 is disposed at the edge of the first through hole 411, and when the current collecting member 40 is assembled with the battery cell 30, the limiting part 43 can be inserted into the central hole 33 of the battery cell 30, thereby improving the positioning effect on the current collecting member 40.

Referring to fig. 4, in some embodiments, the first body portion 41 is provided with a plurality of second through holes 412, and the plurality of second through holes 412 are disposed at equal intervals around the first through hole 411. Through the arrangement of the plurality of second through holes 412, the plurality of second through holes 412 are arranged at equal intervals around the first through hole 411, and the second through holes 412 are used for accommodating the electrolyte to pass through and assisting the circulation of the electrolyte.

The first body 41 is further provided with a plurality of solder marks 414, and the plurality of solder marks 414 are spaced apart from the plurality of second through holes 412.

Referring to fig. 4, in some embodiments, the outer peripheral edge of the first body portion 41 is provided with a notch 413. Through the arrangement of the notch 413, the notch 413 can be convenient for positioning when the current collecting member 40 is welded, and can also be used as an electrolyte filling channel to improve the infiltration of electrolyte between the pole pieces.

Referring to fig. 1 and 3, the cylindrical battery 100 according to the embodiment of the present utility model further includes an electrode lead-out terminal 60, and a mounting hole 13 is provided at one end of the case 10 facing away from the cap 20, and the electrode lead-out terminal 60 is mounted in the mounting hole 13 in an insulating and sealing manner. By arranging the electrode lead-out terminal 60, the electrode lead-out terminal 60 is mounted in the mounting hole 13 of the casing 10 in an insulating and sealing manner, so that the electrode lead-out terminal 60 and the casing 10 are effectively separated, and the battery 100 is prevented from being short-circuited due to the contact between the electrode lead-out terminal 60 and the casing 10.

Specifically, a second insulating member 80 is disposed between the electrode lead-out terminal 60 and the case 10, and the second insulating member 80 is used for isolating the electrode lead-out terminal 60 from the case 10.

Referring to fig. 1 to 3, a battery cell 30 according to an embodiment of the present utility model includes a first tab 31 and a second tab 32, the polarities of the first tab 31 and the second tab 32 are opposite, the first tab 31 is electrically connected to a first current collecting member 40, and the second tab 32 is electrically connected to an electrode lead-out terminal 60. Through the arrangement of the first tab 31 and the second tab 32, the polarities of the first tab 31 and the second tab 32 are opposite, the first tab 31 can be electrically connected with the shell 10 through the first current collecting member 40, and the second tab 32 can be electrically connected with the electrode lead-out terminal 60, so that the assembly of the battery cell 30 is effectively realized.

Referring to fig. 1, 3 and 5, in some embodiments, a second current collecting member 50 is connected between the second tab 32 and the electrode lead-out terminal 60, the second current collecting member 50 includes a second body portion 51 and a conductive stem 52, the second body portion 51 is welded to the second tab 32, the second body portion 51 is provided with a third through hole 511 corresponding to the position of the central hole 33 of the battery cell 30, one end of the conductive stem 52 is connected to an edge of the third through hole 511, and the other end of the conductive stem 52 is connected to the electrode lead-out terminal 60. Through the arrangement of the second main body part 51 and the conductive handle 52, the second main body part 51 is welded with the second lug 32, one end of the conductive handle 52 is connected with the edge of the third through hole 511 of the second main body part 51, the other end of the conductive handle 52 is connected with the electrode leading-out terminal 60, the connection of the second current collecting member 50 with the second lug 32 and the electrode leading-out terminal 60 is effectively realized, and meanwhile, the positions of the electrode leading-out terminal 60 and the electrode lug welded on the second current collecting member 50 are prevented from being identical, so that the occurrence of cold welding of the battery 100 is prevented, and the overcurrent capacity of the battery 100 is improved. By the arrangement of the third through holes 511, the third through holes 511 can accommodate electrolyte to pass through, and the infiltration of the battery cells 30 is assisted.

Referring to fig. 5, further, the second body portion 51 is provided with a plurality of fourth through holes 512, and the plurality of fourth through holes 512 are equally spaced around the third through holes 511. Through the arrangement of the fourth through holes 512, the first through holes 411 are arranged around the third through holes 511 at equal intervals, and the fourth through holes 512 can assist the circulation of electrolyte, so that the infiltration effect of the battery cell 30 is improved.

Referring to fig. 3, further, a first insulator 70 is provided between the second body portion 51 and the bottom wall 12 of the housing 10. By the arrangement of the first insulating member 70, the first insulating member 70 is arranged between the second main body portion 51 and the bottom wall 12 of the case 10, effectively isolating the second main body portion 51 from contact with the bottom wall 12 of the case 10, thereby causing the battery 100 to be short-circuited.

The first insulating member 70 and the second insulating member 80 may be integrally formed members, or may be separate members which are separately manufactured.

In some embodiments, the cell 30 further includes a first pole piece, a second pole piece, and a separator disposed between the first pole piece and the second pole piece, the first pole piece, the separator, and the second pole piece being stacked in sequence and rolled to form the cell 30. The polarities of the first pole piece and the second pole piece are opposite, namely, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece.

Further, the first tab 31 is disposed on the first pole piece, and the second tab 32 is disposed on the second pole piece, so that the first tab 31 and the first pole piece have the same polarity, and the second tab 32 and the second pole piece have the same polarity. Specifically, the first tab 31 and the second tab 32 may be processed to reduce a gap between tab layers of the first tab 31 and a gap between tab layers of the second tab, so as to facilitate connection between the first tab 31 and the first current collecting member 40, and connection between the second tab 32 and the second current collecting member 50. For example, the first tab 31 and the second tab 32 may be kneaded to form a dense end surface on one end of the battery cell 30 near the cap 20, and the second tab 32 forms a dense end surface on the other end of the battery cell 30 far away from the cap 20, so as to reduce the gap between the tab layers of the first tab 31 and the gap between the tab layers of the second tab 32, and facilitate connection between the first tab 31 and the first current collecting member 40, and connection between the second tab 32 and the second current collecting member 50.

The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. Taking the lithium ion battery 100 as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the diaphragm can be PPpolypropylene, polypropylene or PEpolyethylene, polyethylene and the like.

Referring to fig. 1 to 3, a case 10 according to an embodiment of the present utility model includes a beading portion 14 formed at a lower portion of a cap 20 and an inwardly bent crimping portion 15 formed at an upper portion of the cap 20, and before the battery 100 is staked, the beading portion 14 is required to be provided on the case 10 in preparation for the crimping of the battery 100, and after the crimping of the battery 100, the inwardly bent crimping portion 15 of the upper portion of the cap 20 is formed on the case 10.

In some embodiments, the housing 10 may be a hollow structure with one side open, or may be a hollow structure with two sides open. Specifically, the housing 10 includes a side wall 11 and a bottom wall 12, the side wall 11 surrounds the outside of the battery cell 30, and the bottom wall 12 is connected to an end of the side wall 11. The side wall 11 has a cylindrical structure, the bottom wall 12 has a plate-like structure, and the shape of the bottom wall 12 corresponds to the shape of the side wall 11. Optionally, an opening is formed at one end of the side wall 11, and a cap 20 is provided to cover the opening, and the bottom wall 12 is connected to the other end of the side wall 11 facing away from the opening.

It should be noted that the side wall 11 and the bottom wall 12 may be integrally formed, i.e., the housing 10 is an integrally formed member. Of course, the side wall 11 and the bottom wall 12 may also be two members provided separately and then joined together by welding.

The bottom wall 12 of the case 10 or the cap 20 is provided with a filling hole 90, and the electrolyte can be filled into the battery 100 through the filling hole 90.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. A cylindrical battery characterized in that: the battery comprises a shell, a battery core (30) and a first current collecting member (40), wherein the battery core (30) and the first current collecting member (40) are arranged in the shell, the first current collecting member (40) comprises a first main body part (41) and a welding part (42), and the welding part (42) protrudes out of the peripheral edge of the first main body part (41) along the thickness direction of the first current collecting member (40);

the first main body part (41) is welded with the tab of the battery cell (30), and the welding part (42) is inserted into a gap between the side wall (11) of the housing and the battery cell (30) and is welded with the side wall (11) of the housing.

2. The cylindrical battery according to claim 1, wherein: the first current collecting member (40) further comprises a limiting part (43), the first main body part (41) is provided with a first through hole (411) corresponding to the position of the central hole (33) of the battery cell (30), and the limiting part (43) is arranged at the edge of the first through hole (411) and is inserted into the central hole (33) of the battery cell (30).

3. The cylindrical battery according to claim 2, wherein: the first main body part (41) is provided with a plurality of second through holes (412), and the second through holes (412) are arranged around the first through holes (411) at equal intervals.

4. The cylindrical battery according to claim 1, wherein: the outer peripheral edge of the first body part (41) is provided with a notch (413).

5. The cylindrical battery according to claim 1, wherein: the shell comprises a shell body (10) and a cover cap (20), the cover cap (20) seals an opening of the shell body (10), an accommodating space is formed between the cover cap and the shell body (10), the battery cell (30) and the first current collecting member (40) are arranged in the accommodating space, and the battery cell (30) comprises a first tab (31) electrically connected with the first main body part (41).

6. The cylindrical battery according to claim 5, wherein: the battery cell comprises a shell (10), and is characterized by further comprising an electrode leading-out terminal (60), wherein a mounting hole (13) is formed in one end, deviating from the cap (20), of the shell, the electrode leading-out terminal (60) is mounted in the mounting hole (13) in an insulating and sealing mode, the battery cell (30) further comprises a second lug (32) with the polarity opposite to that of the first lug (31), and the second lug (32) is electrically connected with the electrode leading-out terminal (60).

7. The cylindrical battery according to claim 6, wherein: the electrode lead-out terminal comprises a first electrode lead-out terminal (60) and a first electrode lead-out terminal (32), wherein a first current collecting member (50) is connected between the first electrode lead-out terminal (60), the first current collecting member (50) comprises a first main body part (51) and a conductive handle (52), the first main body part (51) is welded with the first electrode lead-out terminal (32), the first main body part (51) is provided with a first through hole (511) corresponding to the position of a central hole (33) of the battery cell (30), one end of the conductive handle (52) is connected with the edge of the first through hole (511), and the other end of the conductive handle (52) is connected with the electrode lead-out terminal (60).

8. The cylindrical battery according to claim 7, wherein: the second main body part (51) is provided with a plurality of fourth through holes (512), and the fourth through holes (512) are arranged around the third through holes (511) at equal intervals.

9. A battery module, characterized in that: comprising a case and the cylindrical battery according to any one of claims 1 to 8, said battery (100) being disposed in said case.

10. An electrical consumer, characterized in that: comprising the battery module according to claim 9.