CN115275456A - Battery and battery packaging method - Google Patents
Battery and battery packaging method Download PDFInfo
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- CN115275456A CN115275456A CN202211024120.6A CN202211024120A CN115275456A CN 115275456 A CN115275456 A CN 115275456A CN 202211024120 A CN202211024120 A CN 202211024120A CN 115275456 A CN115275456 A CN 115275456A
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- main body
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000007789 sealing Methods 0.000 claims description 34
- 238000003825 pressing Methods 0.000 claims description 14
- 238000005538 encapsulation Methods 0.000 claims description 13
- 230000004308 accommodation Effects 0.000 abstract description 8
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings 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
- 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
-
- 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
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells 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
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present application relates to a battery and a method of packaging a battery. The battery comprises a shell and a cover cap, wherein the shell comprises a main body part, a positioning part and a packaging part, the main body part is provided with an accommodating space for accommodating the battery cell, one end of the positioning part is connected to the main body part, and the other end of the positioning part extends towards the direction departing from the accommodating space; the packaging part is connected to one end of the positioning part far away from the main body part and is bent relative to the positioning part to form a positioning groove; the cap is arranged in the positioning portion and limited in the positioning groove, so that the packaging portion is located on one side, away from the positioning portion, of the cap. The location portion of above-mentioned battery extends towards the direction that deviates from accommodation space, can guarantee that location portion does not occupy the space between block and the electric core to distance between compression block and the electric core improves the energy density of battery.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and more particularly, to a battery and a method for packaging the battery.
Background
With the rapid development of new energy markets, the energy density of lithium ion batteries required by electric vehicles is higher and higher, and in order to improve the energy density, battery manufacturers improve the utilization rate of internal space, the size of batteries and other aspects from the design of a chemical system and an internal structure.
In the packaging process of the conventional lithium battery, the lithium battery is generally sealed by combining a groove rolling process and a pier sealing process, however, the groove rolling process needs to extrude a shell of the battery to package a cap of the battery, so that a cap packaging structure formed by the groove rolling process occupies more cell space at the top or the bottom of the battery, and the volume and the energy density of the battery are influenced.
Disclosure of Invention
The embodiment of the application provides a battery and a packaging method of the battery.
According to a first aspect of the present application, an embodiment of the present application provides a battery, including a case and a cap, where the case includes a main body portion, a positioning portion and a packaging portion, the main body portion is provided with an accommodating space for accommodating an electric core, one end of the positioning portion is connected to the main body portion, and the other end extends in a direction away from the accommodating space; the packaging part is connected to one end of the positioning part far away from the main body part and is bent relative to the positioning part to form a positioning groove; the cap is arranged in the positioning portion and limited in the positioning groove, so that the packaging portion is located on one side, away from the positioning portion, of the cap.
According to a second aspect of the present application, an embodiment of the present application provides a method for encapsulating a battery, the method includes providing a housing, the housing having a receiving space for receiving a battery cell, one end of the housing being provided with an opening, the opening communicating with the receiving space; flaring is carried out on one end, provided with an opening, of the shell, so that the shell forms a main body part, a positioning part and a packaging part, and the main body part forms an accommodating space; one end of the positioning part is connected with the main body part, and the other end of the positioning part extends towards the direction departing from the accommodating space; the packaging part is connected to one end of the positioning part far away from the main body part; providing a cover cap, and placing the cover cap on the positioning part; and applying pressure to the packaging part to bend the packaging part relative to the positioning part, and pressing the packaging part on one side of the cap departing from the positioning part.
In the battery that this application embodiment provided, it includes shell and block, and the shell includes main part, location portion and encapsulation portion, and the main part encircles and forms accommodation space, and accommodation space is used for holding the electric core of battery. The positioning part and the packaging part are used for packaging the cap, one end of the positioning part is connected to the main body part, the other end of the positioning part extends towards the direction departing from the containing space, the extending structure enables the end part of the shell to be in a flaring structure instead of a concave structure formed by a rolling groove process, the flaring structure can effectively clamp and position the structure of the cap, the flaring structure can be formed by an extrusion die or other flaring processes, and the phenomenon that the rolling groove process occupies more cell space at the top or the bottom of a battery is avoided. Specifically, the packaging part is connected to one end, far away from the main body part, of the positioning part and is bent relative to the positioning part, the packaging part and the positioning part jointly form a positioning groove, and the positioning groove is used for limiting the position of the cover cap relative to the shell. The block sets up in location portion and is spacing in the constant head tank to make encapsulation portion be located the block and deviate from one side of location portion, thereby with battery seal shaping. The location portion of above-mentioned battery extends towards the direction that deviates from accommodation space, can guarantee that location portion does not occupy the space between block and the electric core to can compress the distance between block and the electric core, improve the energy density of battery.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a battery provided in an embodiment of the present application.
Fig. 2 is an enlarged schematic view of a partial structure of the battery shown in fig. 1.
Fig. 3 is a schematic flowchart of a method for packaging a battery according to an embodiment of the present disclosure.
Fig. 4 is a schematic flowchart of another battery packaging method according to an embodiment of the present disclosure.
Fig. 5 is a schematic size view of the case in the packaging method of the battery shown in fig. 4.
Fig. 6 is a schematic view of a process in the method of packaging the battery shown in fig. 4.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer of hardware may refer to a component by different names. The specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to,"; "substantially" means that a person skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.
The battery and the method for packaging the battery proposed in the present application will be further explained with reference to the detailed description and the schematic drawings.
Referring to fig. 1, a battery 100 is provided according to an embodiment of the present disclosure. The battery 100 includes a case 10 and a cap 30, and the cap 30 is enclosed at an end of the case 10. The battery 100 may be a cylindrical battery or a prismatic battery, in the embodiment of the present application, the battery 100 is a cylindrical lithium battery, and the battery 100 may be used as a power battery pack of a new energy vehicle. Further, the battery 100 may further include a battery cell 50, and the battery cell 50 may be a winding battery cell or a laminated battery cell.
In the present embodiment, the housing 10 is made of metal, and the specific material of the housing 10 is not limited by the present specification, for example, the material of the housing 10 may be aluminum alloy, stainless steel, cold-rolled steel, or the like. In the embodiment of the present application, the housing 10 may be a steel shell, which may be formed by punching a stainless steel sheet or a nickel-plated steel sheet, or formed by punching a carbon steel sheet and then performing a nickel plating process. Referring to fig. 2, the housing 10 is substantially in the shape of a cylinder with an opening, the housing 10 includes a main body 12, a positioning portion 14, and a packaging portion 16, the main body 12 surrounds to form an accommodating space 121, and the accommodating space 121 is used for accommodating the battery core 50 of the battery 100. One end of the positioning portion 14 is connected to the main body 12, the other end extends in a direction away from the accommodating space 121, the packaging portion 16 is connected to an end of the positioning portion 14 away from the main body 12 and is bent relative to the positioning portion 14, the packaging portion 16 and the positioning portion 14 together form a positioning groove 18, and the positioning groove 18 is used for limiting the position of the cap 30 relative to the housing 10. The cap 30 is disposed on the positioning portion 14 and is limited by the positioning groove 18, so that the packaging portion 16 is located on a side of the cap 30 away from the positioning portion 14, thereby sealing and molding the battery 100. The positioning portion 14 of the battery 100 extends in the direction away from the accommodating space 121, and it can be ensured that the positioning portion 14 does not occupy the space between the cap 30 and the battery cell 50, so that the distance between the cap 30 and the battery cell 50 is compressed, and the energy density of the battery 100 is improved.
In the embodiment of the present application, the main body 12 is substantially in a hollow cylindrical shape, the positioning portion 14 has a first end 141 and a second end 143, the first end 141 is connected to an end of the main body 12, the second end 143 is connected to the encapsulating portion 16, and the positioning portion 14 may be formed through a flaring process, so that a radial dimension of the positioning portion 14 gradually increases from the first end 141 to the second end 143, which is different from an existing rolling groove shrinking structure, but adopts an outward expanding structure, so that the positioning portion 14 does not occupy a space between the cap 30 and the battery cell 50, and can compress an axial dimension of the outer casing 10, and increase a casing ratio of the battery 100, thereby increasing an energy density of an entire volume of the battery 100. Furthermore, the positioning portion 14 may be a bent structure, which can better adapt to the shapes of the cap 30 and the battery cell 50, and reduce the volume of the battery 100.
In the present embodiment, one end of the packing portion 16 is connected to the positioning portion 14, and the other end extends toward the direction of the central axis of the battery 100 to be spaced opposite to at least a partial structure of the positioning portion 14, thereby forming the positioning groove 18. The packaging part 16 is bent relative to the positioning part 14 to seal the shell 10, so that the risks of cutting the shell 10 and damaging the nickel layer in the extrusion process of the rolling slot hob can be avoided, and the risks of scrapping and rusting of the battery 100 are avoided. Further, the packaging part 16 is disposed outside the cap 30, so that the risk of short circuit in the battery 100 caused by metal debris existing inside the battery core during rolling groove extrusion molding can be avoided.
In the present embodiment, the cap 30 is made of metal, and the specific material of the cap 30 is not limited by the present specification, for example, the material of the cap 30 may be aluminum alloy, stainless steel, cold-rolled steel, or the like. In some embodiments, the material of the cap 30 may be the same as the material of the housing 10, and in other embodiments, the material of the cap 30 may be different from the material of the housing 10.
In the embodiment of the present application, the thickness of the cap 30 may be 0.1 mm to 0.8 mm, the radial dimension of the cap 30 is greater than the inner diameter dimension of the main body 12, so that the cap 30 can be retained in the positioning groove 18, the cap 30 can protect the battery 100 when the battery 100 is charged and when the external circuit of the battery 100 is short-circuited, and the cap 30 and the housing 10 can jointly protect the safety performance of the battery 100.
In the present embodiment, the cap 30 is a negative electrode cap of the battery 100, and it should be understood that in other embodiments, the cap 30 may be a positive electrode cap of the battery 100. Referring to fig. 1 again, further, the battery 100 further includes a positive cap 40, the positive cap 40 is connected to one end of the casing 10 away from the negative cap, the encapsulation structure between the positive cap 40 and the casing 10 can also be implemented by using the positioning portion and the encapsulation portion provided in the foregoing embodiment, that is, the positive end of the casing 10 can also be provided with the positioning portion and the encapsulation portion, the positive cap 40 is encapsulated between the positioning portion and the encapsulation portion, and specific characteristics of the positioning portion and the encapsulation portion can refer to the positioning portion and the encapsulation portion provided in the foregoing embodiment, which are not described again here.
Referring to fig. 2 again, in the present embodiment, the battery 100 further includes a current collecting plate 70, and the current collecting plate 70 is disposed between the battery cell 50 and the cap 30 and connected to the main body 12. The current collecting plate 70 is electrically connected to the battery cell 50, and can collect the current of the battery cell 50. In the embodiment of the present application, a gap 101 is provided between the current collecting disk 70 and the cap 30, and the size of the gap 101 is less than or equal to 1.5 mm, so that the distance between the current collecting disk 70 and the cap 30 is relatively small. Further, there is no structure of the casing 10 between the current collecting disc 70 and the cap 30, for example, there is a cavity between the current collecting disc 70 and the cap 30, and there is no structure of the casing 10 inside the cavity, for example, when projected along the axial direction of the battery cell 50, the projection of the positioning portion 14 is completely outside the projection of the cavity, and there is no overlapping portion between the projection of the positioning portion 14 and the projection of the battery cell 50, so that the control state of the cavity can be ensured, the distance between the current collecting disc 70 and the cap 30 can be further compressed, and the axial dimension of the battery 100 can be reduced.
In this embodiment, the battery 100 further includes a sealing member 90, the sealing member 90 wraps the edge of the cap 30 and contacts the positioning portion 14, and the sealing member 90 is used for sealing the battery 100 to ensure that the battery 100 has good sealing performance, prevent the leakage of the electrolyte in the battery 100, and provide a good sealing environment for the internal reaction of the battery 100. Further, the sealing member 90 can also play a role of pressure reduction and buffering when the cap 30 is pressed down, so as to ensure normal operation of internal components of the battery 100, and provide important guarantee for the service life and safety supply of the battery 100.
In the battery that this application embodiment provided, it includes shell and block, and the shell includes main part, location portion and encapsulation portion, and the main part encircles and forms accommodation space, and accommodation space is used for holding the electric core of battery. The positioning part and the packaging part are used for packaging the cap, one end of the positioning part is connected to the main body part, the other end of the positioning part extends towards the direction deviating from the containing space, the extending structure enables the end part of the shell to be in a flaring configuration instead of a concave configuration formed by a rolling groove process, the flaring configuration can effectively clamp and position the structure of the cap, the flaring configuration can be formed by an extrusion die or other flaring processes, and the phenomenon that the rolling groove process occupies more cell space at the top or the bottom of the battery is avoided. Specifically, the packaging part is connected to one end, far away from the main body part, of the positioning part and is bent relative to the positioning part, the packaging part and the positioning part jointly form a positioning groove, and the positioning groove is used for limiting the position of the cover cap relative to the shell. The block sets up in location portion and is spacing in the constant head tank to make encapsulation portion be located the block and deviate from one side of location portion, thereby with battery seal shaping. The location portion of above-mentioned battery extends towards the direction that deviates from accommodation space, can guarantee that location portion does not occupy the space between block and the electric core to can compress the distance between block and the electric core, improve the energy density of battery.
Referring to fig. 3, based on the battery 100 provided in the above embodiment, an embodiment of the present application further provides a method for packaging a battery. The method includes the following steps S110 to S140.
Step S110, providing a housing.
In the present embodiment, the casing 10 is used for accommodating the battery cell 50, and the casing 10 has a substantially hollow cylindrical shape and has an accommodating space 121 for accommodating the battery cell 50. In step S110, the top end of the housing 10 may be removed to form an opening, which communicates with the accommodation space 121; alternatively, the housing 10 itself may be provided with an opening at one or both ends.
And step S120, flaring the end of the shell with the opening.
In the present embodiment, the end of the outer shell 10 provided with the opening is flared by a flaring process so that the outer shell 10 forms the main body portion 12, the positioning portion 14, and the packing portion 16. Specifically, a suitable flaring tip cone is selected to be placed into the opening according to the specification of the shell 10, and the cut surface of the shell 10 is ensured to be aligned with the surface of the flaring tip cone, the outer diameter of the opening after flaring is approximately 1.2 times of the outer diameter of the opening before flaring, and the end of the shell 10 after flaring can be approximately a complete and distinct conical surface to form the main body part 12, the positioning part 14 and the packaging part 16.
In the present embodiment, the main body portion 12 surrounds and forms an accommodating space 121, and the accommodating space 121 is used for accommodating the battery core 50 of the battery 100. One end of the positioning portion 14 is connected to the main body portion 12, the other end extends in a direction away from the accommodating space 121, and the packaging portion 16 is connected to one end of the positioning portion 14 away from the main body portion 12. In the present embodiment, the specific structure of the housing 10 can refer to the description of the features of the housing 10 of the battery 100, and the description thereof is omitted here.
Step S130, providing a cap, and placing the cap in the positioning portion.
In the present embodiment, the cap 30 is provided and the cap 30 is placed on the positioning portion 14, for example, overlapping one end of the positioning portion 14 away from the main body portion 12, and the cap 30 is used to protect the safety performance of the battery 100. In the present embodiment, the cap 30 is a negative electrode cap of the battery 100, and it should be understood that in other embodiments, the cap 30 may be a positive electrode cap of the battery 100. In the present embodiment, the specific structure of the cap 30 can refer to the description of the features of the cap 30 of the battery 100, and the description thereof is omitted here.
In step S140, pressure is applied to the sealing portion.
In the present embodiment, a pressing process is used to apply pressure to the sealing portion 16, so that the sealing portion 16 is bent relative to the positioning portion 14 and pressed on the side of the cap 30 away from the positioning portion 14. Specifically, the sealing portion 16 is placed in the pressing station, and the sealing portion 16 is subjected to bending processing under the appropriate size of the pressing mold, so that the sealing portion 16 is bent with respect to the positioning portion 14 and is pressed on the side of the cap 30 away from the positioning portion 14.
Therefore, in the above method for encapsulating a battery provided in the embodiment of the present application, a housing 10 is provided, the housing 10 has a receiving space 121 for receiving a battery cell, an opening is formed at one end of the housing 10, the opening is communicated with the receiving space 121, and an end of the housing 10, which is provided with the opening, is flared, so that the housing forms a main body portion 12, a positioning portion 14, and an encapsulating portion 16, the main body portion 12 forms the receiving space 121, one end of the positioning portion 14 is connected to the main body portion 12, and the other end extends in a direction away from the receiving space 121, the encapsulating portion 16 is connected to an end of the positioning portion 14, which is away from the main body portion 12, a cap 30 is provided, the cap 30 is placed on the positioning portion 14, pressure is applied to the encapsulating portion 16, so that the encapsulating portion 16 is bent relative to the positioning portion 14, and is press-bonded to a side of the cap 30, which is away from the positioning portion 14. The above method extends the positioning portion 14 in a direction away from the accommodating space 121, so that the positioning portion 14 does not occupy the space between the cap 30 and the battery cell 50, thereby compressing the distance between the cap 30 and the battery cell 50 and improving the energy density of the battery 100.
Referring to fig. 4, the present application further provides a method for packaging a battery. The method includes the following steps S210 to S240.
Step S210, providing a housing.
Step S220, flaring the end of the housing with the opening.
In this embodiment, the specific implementation of steps S210 to S220 may refer to the description of steps S110 to S120 provided in the above embodiments, and details are not repeated here.
Referring to fig. 5, in the present embodiment, an end of the outer shell 10 having an opening is flared by a flaring process, so that the main body portion 12, the positioning portion 14 and the sealing portion 16 are formed on the outer shell 10. Wherein, the axial distance a of the positioning part 14 in the battery 100 is approximately between 0.1 mm and 3 mm, and the angle theta between the extending direction of the positioning part 14 and the extending direction of the cross section of the casing 10 is approximately between 20 degrees and 80 degrees. Further, the axial distance b between one end of the packing portion 16 away from the positioning portion 14 and the connection node of the positioning portion 14 and the packing portion 16 at the battery 100 is greater than the axial distance a of the positioning portion 14 at the battery 100.
Step S230, providing a battery cell.
In the present embodiment, the battery cell 50 is provided, and the battery cell 50 is placed in the accommodating space 121.
In step S240, a current collecting plate is provided.
In the present embodiment, a current collecting plate 70 is provided, which is disposed on a side of the battery cell 50 facing the positioning portion 14.
In this embodiment, the sequence of steps S220, S230, and S240 is not limited, and in some embodiments, an end of the housing 10 having an opening may be flared first, and then the battery cell 50 and the current collecting plate 70 are provided. In other embodiments, the core 50 and the current collecting plate 70 may be provided first, and then the end of the housing 10 with the opening may be flared.
Step S250, providing a cap, and placing the cap on the positioning portion.
In the present embodiment, the cap 30 is provided, wherein the radial dimension of the cap 30 is larger than the inner diameter dimension of the main body portion 12, the sealing member 90 is provided, the sealing member 90 is wrapped on the edge of the cap 30 to form a sealing structure for the battery 100, and finally the cap is placed on the end of the positioning portion 14 far away from the main body portion 12, so that the sealing member 90 is in contact with the positioning portion 14. The sealing member 90 is used to seal the battery 100, ensure that the battery 100 has good sealing performance, prevent the leakage of the electrolyte in the battery 100, and provide a good sealing environment for the internal reaction of the battery 100. Further, the sealing member 90 can also play a role of pressure reduction and buffering when the cap 30 is pressed down, so as to ensure the normal operation of the internal components of the battery 100, and provide important guarantee for the service life and safety of the battery 100.
In step S260, pressure is applied to the sealing portion.
Referring to fig. 6, in the present embodiment, the encapsulation portion 16 is pressed three times by using a pressing process, so that the encapsulation portion 16 is bent relative to the positioning portion 14 and is pressed on a side of the cap 30 away from the positioning portion 14. Specifically, the encapsulating portion 16 is first pressed by using a pressing mold to bend the encapsulating portion 16 relative to the positioning portion 14, and then the pressing mold is continuously pressed downward to perform a second pressing on the encapsulating portion 16, so that the encapsulating portion 16 is attached to the side of the cap 30 away from the positioning portion 14. And finally, performing third upsetting on the packaging part by using an upsetting die, and upsetting the packaging part 16 to a target height so that the distance between the positioning part 14 and the current collecting disc 70 is less than or equal to 1.5 mm, thereby completing the die-sealing molding of the battery 100.
Therefore, in the above-mentioned battery packaging method provided in this embodiment of the application, the battery cell 50 is placed in the accommodating space 121, the current collecting plate 70 is provided, the current collecting plate is disposed on a side of the battery cell 50 facing the positioning portion 14, the cap 30 is provided, the cap 30 is placed on the positioning portion 14, and the sealing member 90 is wrapped on an edge of the cap 30 to form a sealing structure. Then, the pressure is applied to the sealing portion 16 three times, so that the sealing portion 16 is gradually pressed on the side of the cap 30 away from the positioning portion 14 from the bending relative to the positioning portion 14. The above method enables the positioning portion 14 to extend in the direction away from the accommodating space 121, so that it can be ensured that the positioning portion 14 does not occupy the space between the cap 30 and the battery cell 50, thereby compressing the distance between the cap 30 and the battery cell 50, and improving the energy density of the battery 100.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (11)
1. A battery, comprising:
the battery pack comprises a shell, wherein the shell comprises a main body part, a positioning part and a packaging part, the main body part is provided with an accommodating space for accommodating a battery cell, one end of the positioning part is connected to the main body part, and the other end of the positioning part extends towards a direction departing from the accommodating space; the packaging part is connected to one end, far away from the main body part, of the positioning part and is bent relative to the positioning part to form a positioning groove; and
the cap is arranged in the positioning part and limited in the positioning groove, so that the packaging part is positioned on one side of the cap, which is far away from the positioning part.
2. The battery of claim 1, further comprising a current collecting tray and a cell, wherein the cell is disposed in the receiving space, and the current collecting tray is disposed between the cell and the cap and connected to the main body portion.
3. The battery of claim 2, wherein the current collecting disc is electrically connected with the electric core, a gap is formed between the current collecting disc and the cap, and the size of the gap is less than or equal to 1.5 mm.
4. The battery of claim 1, wherein the battery is a cylindrical battery, the positioning portion has a first end connected to the main body portion and a second end connected to the enclosure portion, and a radial dimension of the positioning portion increases from the first end to the second end.
5. The battery of claim 4, wherein the cap has a radial dimension that is greater than an inner diameter dimension of the body portion, the cap overlying a side of the positioning portion that is distal from the body portion.
6. The battery of claim 5, wherein the cap is a negative cap of the battery, the battery further comprising a positive cap coupled to an end of the housing distal from the negative cap.
7. The battery of any of claims 1-6, further comprising a seal wrapped around an edge of the cap and in contact with the positioning portion.
8. A method of packaging a battery, comprising:
providing a shell, wherein the shell is provided with a containing space for containing a battery core, and one end of the shell is provided with an opening which is communicated with the containing space;
flaring is carried out on one end, provided with the opening, of the shell, so that the shell forms a main body part, a positioning part and a packaging part, and the main body part forms the accommodating space; one end of the positioning part is connected with the main body part, and the other end of the positioning part extends towards the direction departing from the accommodating space; the packaging part is connected to one end, far away from the main body part, of the positioning part;
providing a cap, and placing the cap on the positioning part;
and applying pressure to the packaging part to bend the packaging part relative to the positioning part, and pressing the packaging part on one side of the cover cap, which is far away from the positioning part.
9. The method according to claim 8, wherein the applying the pressure to the packaging part to bend the packaging part relative to the positioning part and press-fit the cap on a side facing away from the positioning part comprises:
performing first pier pressing on the packaging part to bend the packaging part relative to the positioning part;
and carrying out second pier pressing on the packaging part to ensure that the packaging part is attached to one side of the cap departing from the positioning part.
10. The method of claim 9, wherein prior to said providing a cap and placing said cap in said positioning portion, further comprising:
providing a battery cell, and placing the battery cell in the accommodating space;
providing a current collecting disc, and arranging the current collecting disc on one side of the battery cell, which faces the positioning part;
the method further comprises, after the second upsetting the encapsulation:
and performing third pier pressing on the packaging part to ensure that the distance between the cap and the current collecting disc is less than or equal to 1.5 mm.
11. The method of claim 9, wherein the providing a cap and placing the cap in the positioning portion comprises:
providing a cap having a radial dimension greater than an inner diameter dimension of the body portion;
providing a sealing element, and wrapping the sealing element on the edge of the cap to form a sealing structure;
and placing the cap at one end of the positioning part far away from the main body part to enable the sealing piece to be in contact with the positioning part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211024120.6A CN115275456A (en) | 2022-08-24 | 2022-08-24 | Battery and battery packaging method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211024120.6A CN115275456A (en) | 2022-08-24 | 2022-08-24 | Battery and battery packaging method |
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| CN115275456A true CN115275456A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211024120.6A Pending CN115275456A (en) | 2022-08-24 | 2022-08-24 | Battery and battery packaging method |
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