CN113871763B - Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery - Google Patents
Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery Download PDFInfo
- Publication number
- CN113871763B CN113871763B CN202111133065.XA CN202111133065A CN113871763B CN 113871763 B CN113871763 B CN 113871763B CN 202111133065 A CN202111133065 A CN 202111133065A CN 113871763 B CN113871763 B CN 113871763B
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- CN
- China
- Prior art keywords
- cylindrical battery
- upper cover
- cylindrical
- shell
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000003466 welding Methods 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims description 12
- 238000009434 installation Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H01M50/147—Lids or covers
-
- 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
-
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a cylindrical battery, which comprises the shell, a welding object and an electric core, wherein the welding object is arranged in the groove; the battery cell has anodal ear and negative pole ear, and the battery cell installation is located the one end of drain pan with in the casing and negative pole ear, and anodal ear is located the one end of keeping away from the drain pan and connects and upper cover, is equipped with the output that extends along being close to the battery cell direction on the upper cover, anodal ear connection and output and through the output, the negative pole passes through drain pan or the output of cylindrical tube-shape body.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a cylindrical battery shell, a cylindrical battery and a cylindrical battery mounting method
Background
The cylindrical battery has the characteristics of high energy density and long service life, and is widely applied to the fields of electronic products, new energy electric vehicles, military equipment and the like. With the development of new energy electric vehicles, the requirements on the power, energy density, service life, durability and the like of lithium ion batteries are higher and higher. The cylindrical battery housing is typically a steel shell, including a cylindrical barrel structure and a bottom shell. One end of the cylindrical body structure is connected with the bottom shell, the other end of the cylindrical body structure is provided with the cap, and the cap and the bottom shell are connected with the anode and cathode lugs through the current collecting sheets. The current collector occupies a large amount of space within the case, resulting in a decrease in the energy density of the battery. The existing current collecting sheet and the steel shell are generally welded by laser or resistance welding. By adopting laser welding, the welding quality can not be monitored, and the risk of welding through exists. The resistance welding is adopted, the overcurrent area is small, and the larger battery core cannot be met.
Therefore, there is a need for a welding method of a cylindrical battery and a housing to adjust a device, so as to solve the above problems.
Disclosure of Invention
The invention aims to provide a cylindrical battery shell, a cylindrical battery and a cylindrical battery shell mounting method, so as to solve the problems in the prior art.
In order to solve the above problems, according to one aspect of the present invention, there is provided a case of a cylindrical battery, the case including a cylindrical body, an upper cover and a bottom case, one end of the cylindrical body being connected to the bottom case, the upper cover being disposed at the other end of the cylindrical body, and a top surface of the bottom case being provided with a groove.
In one embodiment, the bottom surface of the bottom shell is provided with a protruding strip at a position corresponding to the groove, the bottom surface of the bottom shell is provided with a concave part, and the protruding strip is arranged in the concave part.
In one embodiment, the depth of the recess from the bottom case is greater than or equal to the height of the protrusion protruding from the bottom of the recess.
In one embodiment, the protrusions are L-shaped.
In one embodiment, the protruding strips are two and symmetrically arranged in the concave part.
In one embodiment, the recess is circular and concentric with the bottom shell.
The invention also relates to a cylindrical battery comprising a housing of the cylindrical battery, a weld and an electrical core; the welding object is arranged in the groove; the battery cell is provided with a positive electrode lug and a negative electrode lug, the battery cell is installed in the shell, the negative electrode lug is connected with the bottom shell through the welding object, and the positive electrode lug is connected with the upper cover.
In one embodiment, the weld is shown as a braze.
In one embodiment, the upper cover is provided with an output end, and the positive electrode lug is connected with the output end.
In one embodiment, the cylindrical battery further comprises a current collecting plate, an insulating plate and a sealing ring; one end of the current collecting sheet is connected with the positive electrode lug, and a connecting part extending towards the upper cover is arranged on the current collecting sheet; the insulating sheet covers one side of the current collecting sheet far away from the battery cell, a through hole is formed in the insulating sheet, and the connecting part can penetrate through the through hole and be connected with the output end; the sealing ring is arranged between the outer periphery of the positive electrode lug, the upper cover, the current collecting piece and the insulating piece and the inner periphery of the cylindrical body.
The invention also relates to a method for installing the cylindrical battery shell, which is to weld the negative electrode lug of the battery cell of claim 7 to the bottom shell through the welding object in a low-temperature welding mode. The damage to the tab can be reduced by low-temperature welding, so that the risk of leakage caused by damage to the bottom shell 12 due to high-temperature laser welding is avoided, the welding area is not limited by low-temperature welding, welding rods with larger area can be used for welding, and the problem that the overflow area is insufficient and the welding fastness is low due to small welding area is avoided.
Drawings
Fig. 1 is a perspective view of a cylindrical battery according to an embodiment of the present invention.
Fig. 2-3 are exploded views of a cylindrical battery according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention.
Fig. 5 is a perspective view of a cylindrical battery according to an embodiment of the present invention.
Fig. 6 is a bottom view of a cylindrical battery according to one embodiment of the present invention.
Reference numerals: 100. a cylindrical battery; 1. a housing; 11. a cylindrical barrel; 12. a bottom case; 121. a groove; 122. a protruding strip; 123. a recessed portion; 13. an upper cover; 131. a liquid injection port; 132. sealing nails; 133. an explosion-proof valve; 2. a weld; 3. a battery cell; 4. a current collecting sheet; 41. a connection part; 5. an insulating sheet; 6. and (3) sealing rings.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that the objects, features and advantages of the present invention will be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the invention, but rather are merely illustrative of the true spirit of the invention.
In the following description, for the purposes of explanation of various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that an embodiment may be practiced without one or more of the specific details. In other instances, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the following description, for the purposes of clarity of presentation of the structure and manner of operation of the present invention, the description will be made with the aid of directional terms, but such terms as "forward," "rearward," "left," "right," "outward," "inner," "outward," "inward," "upper," "lower," etc. are to be construed as convenience, and are not to be limiting.
The present invention relates to a case 1 of a cylindrical battery 100, the case 1 including a cylindrical barrel 11, an upper cover 13, and a bottom case 12. One end of the cylindrical body 11 is connected with the bottom shell 12, the upper cover 13 is arranged at the other end of the cylindrical body 11, and the top surface of the bottom shell 12 is provided with a groove 121 which is concave towards the outside of the shell 1. It will be appreciated that the cylindrical body 11 and the bottom shell 12 may be integrally formed, or may be connected by welding. The cylindrical body 11 and the bottom case 12 may be both steel.
The groove 121 is opened toward the inside of the housing 1, and the cross-sectional shape of the groove 121 is not limited and may be any shape. For example, it is circular, square or other irregular pattern, preferably circular. The overall contour of the groove 121 is not limited, and may be a bar shape or an irregular shape. The number of the grooves 121 may be plural or singular. The arrangement of the plurality of grooves 121 is not limited, and may be symmetrical or arbitrary. That is, the shape and the number of the grooves 121 are not limited, and only the negative electrode lug of the battery cell 3 can be connected with the bottom shell 12 through the welding object 2 in the groove 121. In the embodiment shown in fig. 5 to 6, the cross section of the groove 121 is semicircular, and the entire groove 121 is L-shaped, two in number, and is arranged symmetrically to the center of the bottom chassis 12. The welding object 2 can be placed in the groove 121 so as to facilitate the welding connection of the shell 1 to the negative electrode lug of the battery core 3, so that the space of one current collecting piece 4 is saved, the utilization rate of the space of the shell 1 can be remarkably improved, and the energy density of the battery is improved.
Optionally, the bottom surface of the bottom case 12 is provided with a protrusion 122 at a position corresponding to the groove 121. In the case of the bottom shell 12 being a stamping, the recess 121 is recessed toward the bottom so that the bottom surface of the bottom shell 12 forms a corresponding ridge 122. It is understood that the bottom surface of the bottom chassis 12 may not be formed with the protrusions 122 if the thickness of the bottom chassis 12 is sufficiently thick or the depth of the grooves 121 is smaller than the thickness of the bottom chassis 12. In order to prevent the protruding strip 122 from protruding from the bottom shell 12 and being worn during use, the bottom surface of the bottom shell 12 is provided with a recess 123 recessed toward the inside of the housing 1, and the protruding strip 122 is disposed in the recess 123, i.e. the groove 121 is correspondingly located in the recess 123.
Further, the depth of the recess 123 from the bottom surface is greater than or equal to the protruding height of the protrusion 122 from the bottom of the recess 123, so that the protrusion 122 and the bottom shell 12 may be on the same plane or not protruding outside the bottom shell 12. It is to be understood that the shape of the recess 123 is not limited, and may be any shape, so long as the protrusion 122 is completely located in the recess 123.
Further, the recess 123 is circular and concentric with the bottom case 12. As shown in fig. 5 to 6, the recess 123 and the bottom case 12 are concentric and smaller than the diameter of the bottom case 12, and two L-shaped grooves 121 are symmetrically disposed inside the recess 123. Specifically, the two L-shaped grooves 121 are symmetrical along the center of the recess 123 and the bottom case 12 and the opening of the L-shape is close to the bottom case 12 in the circumferential direction.
The invention also relates to a cylindrical battery 100 comprising a housing 1, a weld 2 and a cell 3 as described above. The weldment 2 is arranged in the groove 121. The battery cell 3 is provided with a positive electrode lug and a negative electrode lug, the battery cell 3 is arranged in the shell 1, the negative electrode lug is positioned at one end of the bottom shell 12 and is connected with the bottom shell 12 through the welding object 2, and the positive electrode lug is positioned at one end far away from the bottom shell 12 and is connected with the upper cover 13. Specifically, as shown in fig. 1 to 4, the upper cover 13 is provided with an axially extending output end, a positive electrode tab is connected to the output end, and a negative electrode tab is connected to the bottom shell 12 and is output through the bottom shell 12 or the cylindrical barrel 11. During installation, the welding object 2 is required to be installed in the groove 121, then the battery cell 3 is installed in the shell 1, and the welding object 2 can be melted by heating the groove 121, so that the bottom shell 12 is connected with the negative electrode lug of the battery cell 3. The use of the weld 2 instead of the current collecting tab 4 to connect the negative electrode tab to the bottom case 12 can greatly improve the space utilization rate inside the case 1, thereby improving the energy density of the battery.
The solder 2 may be of various types, such as tin bars, solder bars, etc., preferably solder bars, of aluminum composition, which need to be bent into the shape of the recess 121 to facilitate installation into the recess 121. In the embodiment shown in fig. 5-6, the grooves 121 are two L-shaped, requiring two braze strips to fit into the two L-shaped grooves 121.
Cylindrical battery 100 also includes current collector 4, insulating sheet 5, and sealing ring 6. As shown in fig. 2, 3 and 4, one end of the current collecting tab 4 is connected to the positive electrode tab, and the current collecting tab 4 is provided with a connection portion 41 extending toward the upper cover 13. The insulating sheet 5 covers one side of the current collecting sheet 4 far away from the battery core 3, and a through hole is formed in the insulating sheet, and the connecting part 41 can penetrate through the through hole to connect with the output end. The sealing ring 6 is arranged between the outer circumferences of the positive electrode lug, the upper cover 13, the current collecting piece 4 and the insulating piece 5 and the inner circumference of the sealing ring 6. The sealing ring 6 can insulate and seal the positive electrode tab, the current collecting plate 4, the insulating cover and the upper cover 13 from the cylindrical body 11, thereby preventing the cylindrical body 11 from being electrically connected with the upper cover 13 and the output terminal.
The upper cover 13 is also provided with a liquid injection port 131 and a sealing nail 132, and after electrolyte is injected into the battery cell 3 through the liquid injection port 131, the sealing nail 132 can be connected with the upper cover 13 in a laser welding mode and plays a role in sealing. Further, channels are further formed on the current collecting sheet 4 and the insulating sheet 5 to facilitate the electrolyte to flow into the battery cell 3 through the channels.
Further, the upper cover 13 is further provided with an explosion-proof valve 133, and the explosion-proof valve 133 can prevent the explosion of the battery cell 3 caused by thermal runaway.
The present invention also relates to a method of mounting the cylindrical battery 100. The method comprises the step of welding the negative electrode lug of the battery cell 3 to the bottom shell 12 through a welding object 2 by utilizing a low-temperature welding mode. The damage to the tab can be reduced by low-temperature welding, so that the risk of leakage caused by damage to the bottom shell 12 due to high-temperature laser welding is avoided, the welding area is not limited by low-temperature welding, welding rods with larger area can be used for welding, and the problem that the overflow area is insufficient and the welding fastness is low due to small welding area is avoided.
While the preferred embodiments of the present invention have been described in detail, it will be appreciated that those skilled in the art, upon reading the above teachings, may make various changes and modifications to the invention. Such equivalents are also intended to fall within the scope of the claims appended hereto.
Claims (9)
1. A cylindrical battery, wherein the cylindrical battery comprises:
the shell of the cylindrical battery comprises a cylindrical barrel, an upper cover and a bottom shell, wherein the upper cover is arranged at one end of the cylindrical barrel; the bottom shell is connected with the other end of the cylindrical barrel body, and comprises a groove arranged on the top surface of the bottom shell;
the welding object is arranged in the groove; and
the battery cell is arranged in the shell and comprises a positive electrode lug and a negative electrode lug, the negative electrode lug is connected with the bottom shell through the welding object, and the positive electrode lug is connected with the upper cover;
the bottom case further includes:
the protruding strip is arranged at a position corresponding to the groove on the bottom surface of the bottom shell; and
the concave part is arranged on the bottom surface of the bottom shell, and the protruding strip is arranged in the concave part.
2. The cylindrical battery of claim 1, wherein the weld is a braze.
3. The cylindrical battery of claim 1, wherein the upper cover comprises an output end, and the positive tab is connected to the output end.
4. The cylindrical battery of claim 3, wherein the cylindrical battery further comprises:
the current collecting piece is connected with the positive electrode lug at one end and comprises a connecting part extending towards the upper cover;
the insulating sheet covers one side, far away from the battery cell, of the current collecting sheet, the insulating sheet comprises a through hole, and the connecting part is suitable for being connected with the output end through the through hole; and
the sealing ring is arranged between the outer circumferences of the positive electrode lug, the upper cover, the current collecting sheet and the insulating sheet and the inner circumference of the cylindrical barrel body.
5. The cylindrical battery according to claim 1, wherein a depth of the recess from the bottom case is greater than or equal to a height of the protrusion protruding from a bottom of the recess.
6. The cylindrical battery of claim 1, wherein the tab is L-shaped.
7. The cylindrical battery of claim 1, wherein the protruding bars are provided in two and are symmetrically disposed within the recess.
8. The cylindrical battery of claim 1, wherein the recess is circular and concentric with the bottom case.
9. A method for mounting a cylindrical battery, characterized in that the negative electrode tab of the cell of the cylindrical battery according to claim 1 is welded to the bottom case by means of the weld by means of low-temperature welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111133065.XA CN113871763B (en) | 2021-09-27 | 2021-09-27 | Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111133065.XA CN113871763B (en) | 2021-09-27 | 2021-09-27 | Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113871763A CN113871763A (en) | 2021-12-31 |
| CN113871763B true CN113871763B (en) | 2024-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111133065.XA Active CN113871763B (en) | 2021-09-27 | 2021-09-27 | Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery |
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| Country | Link |
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| CN (1) | CN113871763B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114628854B (en) * | 2022-03-28 | 2024-01-30 | 远景动力技术(江苏)有限公司 | Cylindrical battery and method for manufacturing the same |
| CN114639863B (en) * | 2022-03-28 | 2023-07-28 | 远景动力技术(江苏)有限公司 | Cylindrical battery and method for manufacturing the same |
| CN114597555B (en) * | 2022-03-28 | 2024-04-12 | 远景动力技术(江苏)有限公司 | Cylindrical battery and method for manufacturing the same |
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| Publication number | Publication date |
|---|---|
| CN113871763A (en) | 2021-12-31 |
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