CN114784464A - Battery cell and battery module - Google Patents
Battery cell and battery module Download PDFInfo
- Publication number
- CN114784464A CN114784464A CN202210273082.1A CN202210273082A CN114784464A CN 114784464 A CN114784464 A CN 114784464A CN 202210273082 A CN202210273082 A CN 202210273082A CN 114784464 A CN114784464 A CN 114784464A
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- welding
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- current collecting
- disc
- column
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
Abstract
The invention relates to the technical field of batteries, in particular to a battery cell and a battery module. The battery cell comprises a conductive shell, a core body and a cover plate, wherein the top of the conductive shell is provided with a top opening, the bottom of the conductive shell is provided with a shell bottom wall, the cover plate covers the top opening of the conductive shell, the core body is arranged in the conductive shell, the battery cell also comprises an anode current collecting disc and a cathode current collecting disc, the top end of the core body is provided with a cathode tab, the bottom end of the core body is provided with an anode tab, the shell bottom wall is provided with a current collecting disc splicing hole, the anode current collecting disc comprises a welding column and an annular disc body, the annular disc body is in conductive connection with the anode tab, and the welding column extends into the current collecting disc splicing hole to be spliced and fixed with the conductive shell; the bottom end face of the welding column is positioned in the flow collecting plate tailor-welded hole or the bottom end face of the welding column is flush with the outer side face of the bottom wall of the shell. The battery cell effectively solves the problems of welding penetration, insufficient welding and poor air tightness easily caused by the conventional laser penetration welding process for welding the conductive shell and the positive current collecting plate, and improves the welding yield.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cell and a battery module.
Background
The full-lug large-cylinder lithium ion battery has the advantages of high safety, low heat production quantity, low cost, stable structure, low internal resistance of the battery, high energy density, power density and the like, the performance of the full-lug large-cylinder lithium ion battery can be compared with that of a blade battery, and various large battery manufacturers in the lithium battery industry begin to develop a novel technical process aiming at the full-lug large-cylinder lithium ion battery, strive to solve various problems in the structural production process, and open up a new direction for respective planning and layout.
Chinese utility model patent with publication number CN214043927U discloses a single battery, which comprises a casing and a cover plate, wherein one end of the casing is open, the other end is closed, and the cover plate is covered at the open end. The single battery further comprises an electric core, a first current collecting plate and a second current collecting plate, wherein the electric core, the first current collecting plate and the second current collecting plate are arranged in the shell, a first electrode lug is arranged at the top of the electric core, a second electrode lug is arranged at the bottom of the electric core, the first current collecting plate is abutted to the first electrode lug, and the second current collecting plate is abutted to the second electrode lug.
The first current collecting plate of the battery is a negative current collecting plate, the first tab is a negative electrode tab, the second current collecting plate is a positive current collecting plate, the second tab is a positive electrode tab, the shell of the battery is a conductive shell, the bottom wall of the conductive shell and the positive current collecting plate are generally welded and fixed when the battery is processed and assembled, the positive current collecting plate is welded on the conductive shell by various welding process technologies, and the electric connection can be realized by adopting different modes such as a resistance welding process, a laser penetration welding process, a laser tailor welding process and the like. The spark in the welding process of resistance welding is big, the effective residual area of welding is small, the welding strength is low, and serious potential safety hazard is brought to the battery, so resistance welding is not generally adopted in the actual production process, laser penetration welding is mostly adopted, the laser penetration welding is fast, the penetration depth is high, but because the positive current collecting disc is thinner, the bottom wall of the conductive shell is thicker, and the poor problems of welding penetration, false welding, poor air tightness and the like easily occur when the conductive shell and the positive current collecting disc are welded from the outside of the bottom wall of the conductive shell.
Disclosure of Invention
The invention aims to provide a battery cell, which is used for solving the technical problems of easy occurrence of welding penetration, insufficient welding and poor air tightness when a current collecting plate is welded with a conductive shell. The invention also provides a battery module comprising the battery core.
The technical scheme of the battery cell is as follows:
the battery cell comprises a conductive shell, a core body and a cover plate, wherein the top of the conductive shell is provided with a top opening, the bottom of the conductive shell is provided with a shell bottom wall, the cover plate covers the top opening of the conductive shell, the core body is arranged in the conductive shell, the battery cell also comprises an anode current collecting disc and a cathode current collecting disc, the top end of the core body is provided with a cathode lug which is conductive with the cathode current collecting disc, the bottom end of the core body is provided with an anode lug which is conductive with the anode current collecting disc, the shell bottom wall is provided with a current collecting disc splicing welding hole, the anode current collecting disc comprises a welding column and an annular disc body which is positioned at the periphery of the welding column, the annular disc body is electrically connected with the anode lug, the anode current collecting disc is welded with the conductive shell through the welding column, and the welding column extends into the current collecting disc splicing welding hole to be spliced and fixed with the conductive shell; the bottom end face of the welding column is positioned in the flow collecting plate tailor-welded hole or the bottom end face of the welding column is flush with the outer side face of the bottom wall of the shell.
Has the beneficial effects that: according to the invention, the current collecting plate splicing welding hole is formed in the bottom wall of the shell of the battery cell, the positive current collecting plate comprises the welding column and the annular plate body, when the battery cell is processed and assembled, the annular plate body is in conductive connection with the positive electrode lug of the core body, the welding column firstly extends into the current collecting plate splicing welding hole in the bottom wall of the shell, and then the welding column is welded with the conductive shell through a laser splicing welding process, so that the problems of welding penetration, false welding and poor air tightness easily caused when the conductive shell and the positive current collecting plate are welded by adopting a laser penetration welding process in the past are effectively avoided, the welding yield is improved, and when the laser splicing welding process is adopted, the welding seam quality can be monitored in real time, and products with poor welding seams can be eliminated in advance. In addition, the bottom end face of the welding column is located in the splice welding hole of the current collector or the bottom end face of the welding column is parallel and level to the outer side face of the bottom wall of the shell, so that the bottom surface of the battery cell is relatively flat, and the battery cell is convenient to arrange and assemble.
Furthermore, the welding column is welded and fixed with the annular disc body.
Has the beneficial effects that: the welding column and the annular disc body are separately processed and fixed by welding, and the processing difficulty is small.
Furthermore, the welding mode of the welding column and the annular disc body is laser welding.
Has the beneficial effects that: and a welding mode of laser welding is adopted, so that the welding speed is high, and the welding strength is high.
Further, the welding column and the annular disc body are integrally extruded and formed.
Has the advantages that: the welding column and the annular disc body are processed in an integrated extrusion forming mode, the forming speed is high, and the structural strength is high.
Further, the annular disc body is connected to the top of the welding column.
Has the advantages that: the annular disc body is connected at the top of the welding column, so that the structure of the positive current collecting disc is simple, and the processing is convenient.
Furthermore, be provided with the convex disk body arch to anodal utmost point ear on the annular disk body, the disk body arch welds with anodal utmost point ear.
Has the beneficial effects that: the positive pole lug is welded and fixed with the lug boss of the disc body, and after the battery core is processed and assembled, the lug boss of the disc body has a compression effect on the positive pole lug, so that the positive pole current collecting disc and the positive pole lug are better in conductive effect.
Furthermore, the battery cell is a cylindrical battery cell, and the conductive shell is cylindrical.
Further, the conductive housing is integrally formed.
Has the advantages that: the integrally formed conductive shell has higher structural strength.
Further, the welding column is a solid column.
Has the beneficial effects that: the welding post is solid post, can effectively avoid the welding post because the extrusion appears warping to influence the phenomenon of electric core performance.
The technical scheme of the battery module is as follows:
the battery module comprises a module shell and a plurality of battery cells, the battery cells are positioned inside the module shell, the battery cells comprise a conductive shell, a core body and a cover plate, the top of the conductive shell is provided with a top opening, the bottom of the conductive shell is provided with a shell bottom wall, the cover plate covers the top opening of the conductive shell, the core body is arranged in the conductive shell, the battery cells further comprise an anode current collecting plate and a cathode current collecting plate, the top end of the core body is provided with a cathode tab which is conductive to the cathode current collecting plate, the bottom end of the core body is provided with an anode tab which is conductive to the anode current collecting plate, the bottom end of the core body is provided with a current collecting plate splicing hole, the anode current collecting plate comprises a welding column and an annular plate body which is positioned at the periphery of the welding column, the annular plate body is conductively connected with the anode tab, the anode plate is welded with the conductive shell through the welding column, and the welding column is stretched into the current collecting plate splicing hole to be spliced and fixed with the conductive shell; the bottom end face of the welding column is located in the flow collecting plate tailor-welding hole or the bottom end face of the welding column is parallel and level with the outer side face of the bottom wall of the shell, and the outer side face of the bottom wall of the shell of the battery cell is attached to the module shell to support the battery cell.
Has the beneficial effects that: the battery module comprises a battery cell, a current collecting plate splicing welding hole is formed in the bottom wall of an outer shell of the battery cell, an anode current collecting plate comprises a welding column and an annular plate body, the annular plate body is in conductive connection with an anode tab of a core body when the battery cell is machined and assembled, the welding column firstly extends into the current collecting plate splicing welding hole in the bottom wall of the outer shell, and then the welding column is welded with the conductive outer shell through a laser splicing welding process, so that the problems of welding penetration, insufficient welding and poor air tightness which are easily caused when the conductive outer shell and the anode current collecting plate are welded through the laser penetration welding process in the past are effectively avoided, the welding yield is improved, and when the laser splicing welding process is adopted, the quality of a welding line can be monitored in real time, and products with poor welding lines can be eliminated in advance. In addition, the bottom terminal surface of welding post is located the setting of the bottom terminal surface and the shell diapire lateral surface parallel and level of current collector tailor-welded hole or welding post for the bottom surface of electric core is comparatively level and smooth, and the shell diapire can be laminated in order to support electric core with the module shell of battery module when electric core installation, makes things convenient for arranging and assembling of electric core.
Furthermore, the welding column is welded and fixed with the annular disc body.
Has the advantages that: the welding column and the annular disc body are separately processed and fixed by welding, and the processing difficulty is small.
Furthermore, the welding mode of the welding column and the annular disc body is laser welding.
Has the beneficial effects that: and a welding mode of laser welding is adopted, so that the welding speed is high, and the welding strength is high.
Further, the welding column and the annular disc body are integrally extruded and formed.
Has the beneficial effects that: the welding column and the annular disc body are processed in an integrated extrusion forming mode, the forming speed is high, and the structural strength is high.
Further, the annular disc body is connected to the top of the welding column.
Has the advantages that: the annular disc body is connected at the top of the welding column, so that the structure of the positive current collecting disc is simple, and the processing is convenient.
Furthermore, the annular disk body is provided with a disk body bulge protruding towards the positive pole lug, and the disk body bulge is welded with the positive pole lug.
Has the advantages that: the positive pole lug is welded and fixed with the lug boss of the disc body, and after the battery core is processed and assembled, the lug boss of the disc body has a compression effect on the positive pole lug, so that the positive pole current collecting disc and the positive pole lug are better in conductive effect.
Furthermore, the battery cell is a cylindrical battery cell, and the conductive shell is cylindrical.
Further, the conductive housing is integrally formed.
Has the advantages that: the integrally formed conductive shell has higher structural strength.
Further, the welding column is a solid column.
Has the beneficial effects that: the welding post is solid post, can effectively avoid the welding post because the extrusion appears warping to influence the phenomenon of electric core performance.
Drawings
Fig. 1 is a schematic structural view of a battery cell of embodiment 1 of the present invention;
fig. 2 is a schematic view of a positive current collecting plate in the cell embodiment 1 of the present invention;
FIG. 3 is a cross-sectional view at A-A of FIG. 2;
FIG. 4 is a view from the direction B of FIG. 3;
fig. 5 is a schematic structural view of a conductive housing in the battery cell of embodiment 1 of the present invention;
FIG. 6 is a bottom view of FIG. 5;
fig. 7 is a partially enlarged view of the case bottom wall in the battery cell embodiment 1 of the present invention.
Description of reference numerals: 1. a conductive housing; 2. a cover plate; 3. a housing bottom wall; 4. a winding core; 5. a central bore; 6. a positive current collector; 7. a negative current collecting plate; 8. an explosion-proof valve; 9. welding the column; 10. an annular disc body; 11. splicing and welding holes of the current collecting plate; 12. the disc body is convex; 13. a pole column; 14. and (6) welding the ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention 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 present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the embodiments of the present invention, terms such as "first" and "second" may be used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that such actual relationship or order exists between the entities or operations. Also, terms such as "comprises," "comprising," or any other variation thereof, which may be present, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the phrase "comprising an … …" or similar limitation may be present without necessarily excluding the presence of additional identical elements in the process, method, article, or apparatus that comprises the same elements.
In the description of the present invention, unless otherwise explicitly specified or limited, terms such as "mounted," "connected," and "connected" that may be present are to be construed broadly, e.g., as a fixed connection, a releasable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, unless otherwise specifically stated or limited, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meanings of the above-mentioned terms in the present invention can be understood by those skilled in the art through specific situations.
The present invention will be described in further detail with reference to examples.
Embodiment 1 of the cell provided in the present invention:
as shown in fig. 1 to 7, the battery cell is a cylindrical battery cell, and the battery cell includes a conductive casing 1, a core body, and a cover plate 2. Conductive housing 1 is aluminium system shell to be cylindricly, conductive housing 1's inside has the cavity, and open-top has been seted up at conductive housing 1's top, and conductive housing 1's bottom has shell diapire 3, and the open-top that covers conductive housing 1 is sealed to apron 2 to the open-top to conductive housing 1 seals. The core body is positioned in the inner cavity of the conductive shell 1 and is rolled into a cylindrical roll core 4, a central hole 5 which is communicated up and down is arranged at the central position of the roll core 4, the top end of the roll core 4 is provided with a negative pole lug, and the bottom end of the roll core 4 is provided with a positive pole lug.
The battery cell further comprises an anode current collecting disc 6 and a cathode current collecting disc 7, wherein the anode current collecting disc 6 is in conductive connection with an anode tab, and the cathode current collecting disc 7 is in conductive connection with a cathode tab. The cover plate 2 is provided with a pole column through hole, and the pole column 13 penetrates through the pole column through hole to be in conductive connection with the negative electrode current collecting plate 7. In this embodiment, the positive current collecting disk 6 and the positive electrode tab, the negative current collecting disk 7 and the negative electrode tab, and the electrode post 13 and the negative current collecting disk 7 are all conductively connected by a laser welding process. Still be equipped with explosion-proof valve 8 on apron 2, the inside reaction of taking place of electric core can produce gaseously, and when the inside atmospheric pressure of electric core was too big, explosion-proof valve 8 can open the pressure release, prevents that electric core from exploding. The structure of the explosion-proof valve 8 is common in the prior art, and the specific structure thereof is not described in detail herein.
The structure of the positive current collecting plate 6 is shown in fig. 2, 3 and 4, the positive current collecting plate 6 comprises a welding column 9 and an annular plate body 10, the annular plate body 10 is in a circular ring shape, the welding column 9 is in a cylindrical shape, and the annular plate body 10 is arranged around the welding column 9. The annular disc body 10 is connected on top of the welding column 9, in this embodiment, the welding column 9 and the annular disc body 10 are connected by a laser welding process, the welding column 9 and the annular disc body 10 are welded to form a welding ring 14 as shown in fig. 4, and the outline of the welding ring 14 is the welding position for welding the welding column 9 and the annular disc body 10. Correspondingly, the central position of the shell bottom wall 3 of the conductive shell 1 is provided with a current collecting disc splicing welding hole 11, and the current collecting disc splicing welding hole 11 is a round hole. In the process of processing and assembling the battery cell, the welding column 9 of the positive current collecting plate 6 needs to extend into the current collecting plate splicing welding hole 11, and the shell bottom wall 3 and the welding column 9 are welded by adopting a laser welding process, specifically, laser splicing welding in the laser welding process, so as to realize conductive connection of the positive current collecting plate 6 and the shell bottom wall 3. The conductive shell 1 and the cover plate 2 are both conductive to the positive current collecting plate 6, when the battery cell is in use, the positive conductive bar connected to the battery cell is conductively connected to the cover plate 2, or in other embodiments, the positive conductive bar connected to the battery cell may also be conductively connected to the bottom wall of the shell of the conductive shell.
In this embodiment, after electric core processing equipment finishes, the bottom terminal surface of welding post 9 and the lateral surface parallel and level of shell diapire 3 to the bottom surface that makes electric core is comparatively level and smooth, the arrangement and the equipment of electric core of being convenient for.
More specifically, a disc body protrusion 12 extending along the radial direction of the annular disc body 10 is arranged on the annular disc body 10 of the positive current collecting disc 6, and the disc body protrusion 12 is electrically connected with the positive electrode tab. The disc body bulge 12 is concave towards one side of the welding column 9, and is convex towards the other side of the welding column 9, so that a groove-shaped disc body bulge 12 is formed. Six disc-shaped bulges 12 are arranged in a radial shape at equal intervals. After the battery core is processed and assembled, the disk body bulge 12 has a compression effect on the positive pole lug, so that the conductive effect between the positive pole current collecting disk 6 and the positive pole lug is better.
In this embodiment, the conductive housing 1 is integrally formed, and the integrally formed conductive housing 1 has higher structural strength.
It should be noted that, when the case bottom wall 3 and the positive electrode current collecting plate 6 are welded by using the laser tailor welding process, the thickness H of the welding position is 0.5-1.5 mm. The height D of the welding column 9 is 0.5-1.5mm, the thickness of the bottom wall 3 of the shell is 0.5-1.5mm, and the diameter of the assembly welding hole 11 of the current collecting disc is 10-20 mm. The above parameters can be adjusted according to actual conditions.
The processing and assembling process of the battery cell comprises the following steps:
1) and flattening the anode tab and the cathode tab of the roll core 4, and encapsulating the top end and the bottom end of the roll core 4.
2) And welding and fixing the negative current collecting disc 7 and the negative pole lug by laser.
3) And (3) welding and fixing the positive current collecting disc 6 and the positive electrode lug by laser, and bending the negative current collecting disc 7 once.
4) One end of the winding core 4 connected with the positive current collecting disc 6 faces the bottom wall 3 of the shell and is placed in the inner cavity of the conductive shell 1, and the welding column 9 of the positive current collecting disc 6 is aligned with the current collecting disc splicing welding hole 11 and extends into the current collecting disc splicing welding hole 11.
5) The bottom wall 3 of the shell and the positive current collecting disc 6 are pressed tightly, laser tailor-welding is carried out from the outside of the bottom wall 3 of the shell to weld the welding column 9 with the bottom wall 3 of the shell, so that the conductive connection between the positive current collecting disc 6 and the conductive shell 1 is realized, the diameter of a welding seam is set according to the diameter of a tailor-welding hole 11 of the current collecting disc, and the weld penetration and the weld width are debugged and set according to overcurrent and connection strength;
6) and (3) secondarily bending the negative current collecting plate 7, enabling the cover plate 2 to cover the top opening of the conductive shell 1, and fixing the cover plate 2 and the conductive shell 1 by laser welding.
Different from embodiment 1, in embodiment 2 of the battery cell of the present invention, after the battery cell is processed and assembled, the bottom end surface of the welding column is located in the splice welding hole of the current collecting plate, so that the bottom surface of the battery cell is flat.
In embodiment 3 of the battery cell of the present invention, unlike embodiment 1, the welding column and the annular disk are integrally extruded.
In embodiment 4 of the battery cell of the present invention, different from embodiment 1, the top end surface and the bottom end surface of the welding column are both higher than the corresponding side surfaces on the annular tray body, so that both ends of the welding column exceed the annular tray body.
In embodiment 8 of the electrical core of the present invention, different from embodiment 1, in this embodiment, the welding column is a hollow column, and the hollow column is adopted as the welding column, which is favorable for light weight of the electrical core.
According to the embodiment of the battery module, the battery module comprises the module shell and the plurality of battery cells, the battery cells are located inside the module shell, the structures of the battery cells are the same as those of the battery cells in any embodiment of the battery cells, repeated description is omitted here, and the bottom wall of the shell can be attached to the module shell of the battery module to support the battery cells during installation of the battery cells, so that the arrangement and assembly of the battery cells are facilitated.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be covered by the scope of the present invention.
Claims (10)
1. An electric core comprises an electric conduction shell (1), a core body and a cover plate (2), wherein the top of the electric conduction shell (1) is provided with a top opening, the bottom of the electric conduction shell is provided with a shell bottom wall (3), the cover plate (2) covers the top opening of the electric conduction shell (1), the core body is arranged in the electric conduction shell (1), the electric core also comprises an anode current collecting disc (6) and a cathode current collecting disc (7), the top end of the core body is provided with a cathode tab which is electrically conducted with the cathode current collecting disc (7), the bottom end of the core body is provided with an anode tab which is electrically conducted with the anode current collecting disc (6), the electric core is characterized in that a current collecting disc welding hole (11) is formed in the shell bottom wall (3), the anode current collecting disc (6) comprises a welding column (9) and an annular disc body (10) which is positioned at the periphery of the welding column (9), the annular disc body (10) is electrically connected with the anode tab, the anode current collecting disc (6) is welded with the electric conduction shell (1) through the welding column (9), the welding column (9) extends into the collecting tray splicing welding hole (11) and is spliced and fixed with the conductive shell (1); the bottom end face of the welding column (9) is positioned in the flow collecting disc splicing welding hole (11) or the bottom end face of the welding column (9) is flush with the outer side face of the bottom wall (3) of the shell.
2. The electrical core according to claim 1, wherein the welding stud (9) is welded to the annular disc (10).
3. The cell of claim 2, wherein the welding of the welding column (9) to the annular disc (10) is by laser welding.
4. The electrical core according to claim 1, wherein the welding stud (9) is integrally extruded with the annular disc (10).
5. The cell of any of claims 1 to 4, wherein the annular disc (10) is attached on top of a weld post (9).
6. The cell according to any of claims 1 to 4, wherein a disc protrusion (12) protruding towards the positive electrode tab is provided on the annular disc (10), and the disc protrusion (12) is welded to the positive electrode tab.
7. The electrical core according to any of the claims 1 to 4, wherein the electrical core is a cylindrical electrical core and the electrically conductive housing (1) is cylindrical.
8. The electrical core according to any of claims 1 to 4, wherein the electrically conductive housing (1) is integrally formed.
9. The electrical core according to any of claims 1 to 4, characterized in that the welding stud (9) is a solid stud.
10. The battery module comprises a module shell and a plurality of battery cells, wherein the battery cells are positioned inside the module shell, the battery cells are the battery cells of any one of claims 1 to 9, and the outer side surface of the shell bottom wall (3) of each battery cell is attached to the module shell to support the battery cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210273082.1A CN114784464A (en) | 2022-03-18 | 2022-03-18 | Battery cell and battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210273082.1A CN114784464A (en) | 2022-03-18 | 2022-03-18 | Battery cell and battery module |
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| CN114784464A true CN114784464A (en) | 2022-07-22 |
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| CN202210273082.1A Pending CN114784464A (en) | 2022-03-18 | 2022-03-18 | Battery cell and battery module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115332693A (en) * | 2022-10-14 | 2022-11-11 | 宁德新能源科技有限公司 | Secondary battery and electronic device |
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| WO2024078623A1 (en) * | 2022-10-14 | 2024-04-18 | 宁德新能源科技有限公司 | Secondary battery and electronic device |
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