CN110712359A - Battery shell, forming method thereof and stamping device - Google Patents
Battery shell, forming method thereof and stamping device Download PDFInfo
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- CN110712359A CN110712359A CN201911147399.5A CN201911147399A CN110712359A CN 110712359 A CN110712359 A CN 110712359A CN 201911147399 A CN201911147399 A CN 201911147399A CN 110712359 A CN110712359 A CN 110712359A
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- 238000000034 method Methods 0.000 title claims abstract description 84
- 238000004080 punching Methods 0.000 claims abstract description 262
- 238000003825 pressing Methods 0.000 claims abstract description 111
- 239000012528 membrane Substances 0.000 claims abstract description 40
- 230000002093 peripheral effect Effects 0.000 claims abstract description 40
- 238000012545 processing Methods 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims description 28
- 238000007906 compression Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 26
- 230000005855 radiation Effects 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 7
- 230000001788 irregular Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 abstract description 9
- 238000005406 washing Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 51
- 239000002985 plastic film Substances 0.000 description 20
- 229920006255 plastic film Polymers 0.000 description 20
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 238000005056 compaction Methods 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 241000251468 Actinopterygii Species 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/46—Measuring, controlling or regulating
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application relates to the field of batteries, in particular to a battery shell, a forming method thereof and a stamping device for forming the battery shell. The shell is formed by a membrane to be processed through sectional pit punching, and is provided with a preset processing area which is sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside; the sectional type punching pit comprises a first section punching pit and a second section punching pit, wherein the first section punching pit is a pressing peripheral edge pressing area, and a groove with a first preset depth is formed in the punching contact area in a punching mode; and the second section of punching pit is used for continuously punching the punching contact area and gradually pressing the middle pressing area to form a target groove. Four bights of casing thickness that obtain are washed the hole through the multistage of this application are thicker to can avoid washing the scale line that the hole in-process produced, fold scheduling problem, make the smooth shell inner wall after the shaping.
Description
Technical Field
The application relates to the field of batteries, in particular to a battery shell, a forming method thereof and a stamping device for forming the battery shell.
Background
With the rapid development of electric vehicles, the demand for energy density of lithium ion batteries is higher and higher. This has prompted the development of lithium ion power cells towards high volume, high mass density. The aluminum plastic film is used as a core material of the soft package battery and plays a crucial role in the performance of the battery. The aluminum-plastic film is generally formed by punching pits, and with the development trend of lithium ion battery technology, the requirement on the pit punching quality of the aluminum-plastic film is higher and higher, so that the pit punching depth with larger size is required, and the damage to the aluminum-plastic film in the pit punching process is required to be very small.
At present, the aluminum plastic film punching is mainly realized by driving a punching die to move through a punching machine. The method comprises the steps of firstly fixing an aluminum-plastic film through a material pressing mechanism, then matching a male die and a female die with a pit for forming, extending the periphery of the aluminum-plastic film to form a pit-shaped structure with a certain depth, wherein in the pit forming process, the part positioned by the material pressing mechanism cannot participate in forming deformation, only the part contacted with a punch part of a die extends for forming, and the formed part is uneven in thickness and easy to break. The depth of the aluminum-plastic film and the thickness of the aluminum layer at the punched hole corner are the bottle necks limiting the use of the aluminum-plastic film.
Disclosure of Invention
The application that solves is that current plastic-aluminum membrane dashes the shaping of hole and dashes the technical problem that the depth of penetration and dashes hole bight aluminium layer thickness is low.
In order to solve the technical problem, in a first aspect, the application discloses a battery shell, wherein the shell is formed by a diaphragm to be processed through a segmented pit punching, the shell is provided with at least one target groove, each target groove corresponds to a preset processing area of the diaphragm to be processed, and the preset processing areas are sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside;
the sectional type punching pit comprises a first section punching pit and a second section punching pit, wherein the first section punching pit is used for compacting the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth; and the second section of punching pit is used for continuously punching the punching contact area and gradually pressing the middle pressing area to form the target groove.
Further, the diaphragm to be processed has a preset temperature before the sectional type pit punching.
Further, the preset temperature is 30-60 ℃.
Further, the first preset depth is 0.25-0.35 times of the depth of the target groove.
Further, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner.
In a second aspect, the application discloses a battery shell, the shell is formed by a membrane to be processed through a sectional type pit punching, the shell is provided with at least one target groove, each target groove corresponds to a preset processing area of the membrane to be processed, and the preset processing areas are sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside;
the sectional type punching pit comprises a first section punching pit, a second section punching pit and a third section punching pit, wherein the first section punching pit is used for compacting the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth; the second section of punching pit is used for continuously punching the punching contact area and gradually pressing the middle pressing area to form a groove with a second preset depth; the third section of the punching pit is used for continuously punching the punching contact area to form the target groove.
Further, the diaphragm to be processed has a preset temperature before the sectional type pit punching.
Further, the preset temperature is 30-60 ℃.
Further, the first preset depth is 0.25-0.35 times of the depth of the target groove; and/or the second preset depth is 0.9-0.95 times of the depth of the target groove.
Further, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner.
In a third aspect, the present application discloses a battery case molding method, including:
performing first-section pit punching on a membrane to be processed, wherein the membrane to be processed is provided with a preset processing area, the preset processing area is sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside, the first-section pit punching is used for pressing the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth;
and performing second-section pit punching on the diaphragm to be processed, wherein the second-section pit punching is to continue punching the punching contact area and gradually compress the middle compression area to form a groove or a target groove with a second preset depth.
Further, when the second segment of the punch pit is to form a groove having the second preset depth, the forming method further includes: and carrying out third-section pit punching on the diaphragm to be processed, wherein the third-section pit punching is to continuously punch the punching contact area to form a target groove.
Further, the first preset depth is 0.25-0.35 times of the depth of the target groove.
Further, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner.
Further, before the first section of pit punching is performed on the membrane to be processed, the method further comprises the following steps: and enabling the diaphragm to be processed to reach a preset temperature through a temperature adjusting device.
Further, the heating mode adopted by the temperature adjusting device is radiation heating or contact heating.
Further, the preset temperature is 30-60 ℃.
Further, the heating mode adopted by the temperature adjusting device is radiation heating, and the distance between the membrane to be processed and the temperature adjusting device is 50mm-200 mm.
In a fourth aspect, the present application discloses a stamping device for battery case forming, comprising:
a pit punching male die;
the concave die plate is provided with a recess, the contour of the recess is regular or irregular, and the recess is matched with the pit punching convex die;
the first compression template is arranged at the upper part of the lower concave template and is used for compressing the peripheral edge pressing area of the membrane to be processed;
and the second pressing template is arranged at the upper part of the first pressing template and is used for pressing the middle pressing area of the membrane to be processed.
Furthermore, the stamping device further comprises a driving motor, the second compression template is connected with the driving motor, and the driving motor is used for driving the second compression template to lift.
By adopting the technical scheme, the battery shell, the forming method thereof and the stamping device for forming the battery shell have the following beneficial effects:
the battery shell is formed by punching multiple sections of pits, a peripheral edge pressing area is only compressed in the process of punching the pits by a first section, the area of the part which is not compressed is large in the middle of the peripheral edge pressing area and the area of a punching contact area, and the thickness of the part which is punched with the pit and the part which is not compressed sufficiently share the tension, so that the thickness of the part which is not compressed is uniform with the thickness of four corners of the punched with the pit. The middle pressing area can be gradually compressed in the second pit punching process, the whole thickness difference of the shell is not large after the pit punching is finished, the thickness of four corner portions of the pit punching is thicker than that of the four corner portions of the prior forming method, the problems of fish scale marks, wrinkles and the like generated in the pit punching process can be well avoided, and the inner wall of the formed shell is flat and smooth.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced 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 based on these drawings without creative efforts.
FIG. 1 is a schematic view of a battery case forming process according to one embodiment of the present application;
FIG. 2 is a schematic view of a battery case forming process according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a battery case crater punching process according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a battery case crater punching process according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of heating of a film sheet to be processed according to one embodiment of the present application;
fig. 6 is a schematic structural diagram of a punching device according to another embodiment of the present application.
The following is a supplementary description of the drawings:
11-a pit punching male die; 12-a recessed template; 13-a first compression template; 14-a second compression template; 15-driving the motor; 20-a temperature regulating device; 30-the membrane to be processed.
Detailed Description
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.
In the description of the present application, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The aluminum-plastic film forming method aims to solve the problems that the existing aluminum-plastic film is uneven in pit punching forming thickness, thin in aluminum layer at the corner part after forming and extremely easy to break. The application discloses a battery shell, as shown in fig. 1, the shell is formed by a membrane 30 to be processed through sectional pit punching, the shell is provided with at least one target groove, each target groove corresponds to a preset processing area of the membrane 30 to be processed, and the preset processing areas are sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside; the sectional type punching pit comprises a first section punching pit and a second section punching pit, wherein the first section punching pit is a pressing peripheral edge pressing area, and a groove with a first preset depth is formed in the punching contact area in a punching mode; and the second section of punching pit is used for continuously punching the punching contact area and gradually pressing the middle pressing area to form a target groove.
The battery shell is formed by punching the pits at two sections, only a peripheral edge pressing area is compressed in the process of punching the pits at the first section, the area of the part which is not compressed is large in the middle of the peripheral edge pressing area and the area of the punching contact area, the thickness of the part which is punched with the pit and the part which is not compressed sufficiently share the tension, and the thickness of the part which is not compressed and the thickness of the four corners of the punched with the pit are uniform. And the middle pressing area can be gradually pressed in the second pit punching process until the second pit punching process is completed. Optionally, in the process of compressing the middle compression area, the pressure changes linearly with the depth of the punching pit, and may also change nonlinearly. In some embodiments, the method of compacting the intermediate compaction region can also be such that the intermediate compaction region is progressively compacted inwardly from the peripheral compaction region. Because the middle pressing area is gradually compressed in the second pit punching process, the whole thickness difference is small after the pit punching is finished, the thickness of the four corner parts of the pit punching is thicker than that of the four corner parts of the pit punching in the conventional forming method, the problems of fish scale marks, wrinkles and the like generated in the pit punching process can be well avoided, and the inner wall of the formed shell is flat and smooth. Optionally, the battery case is made of an aluminum-plastic film, high-strength steel, a magnesium alloy, an aluminum alloy, high-performance plastic or a carbon fiber composite material, and the like.
In the embodiment of the present application, the diaphragm 30 to be processed has a predetermined temperature before being subjected to the segmental notching.
Specifically, waiting to process diaphragm 30 can improve plasticity through the mode of preheating before the shaping of dashing the hole, and the messenger dashes the hole shaping effect better, dashes the battery casing behind the shaping of hole and can not have the internal stress and lead to the casing to take place deformation, and the casing quality is higher.
In a possible embodiment, the preset temperature is between 30 ℃ and 60 ℃. Preferably, the preset temperature may be 45 ℃.
In the embodiment of the present application, the preheating temperature of the film 30 to be processed may be determined according to the material of the film 30 to be processed.
In a possible embodiment, the first predetermined depth is 0.25-0.35 times the target groove depth. For example, the first predetermined depth is 0.3 times the depth of the target groove.
In the embodiment of the application, the pit punching process is a continuous and uninterrupted process, and the compression pressure on the edge part in the pit punching process changes in a segmented manner according to the pit punching depth. Optionally, when the pit punching depth is 0.25-0.35 times of the target depth, the peripheral edge pressing region is pressed by selecting a constant pressure, then the middle pressing region is gradually pressed by selecting a variable pressure, and meanwhile, the second-stage pit punching is performed.
In a possible embodiment, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner. For example, the target groove is a square groove.
In the embodiment of the application, the shape of the target groove can be determined according to the requirement of the battery shell in actual use, and optionally, the target groove is a circular groove and can also be a regular polygonal groove or a special-shaped groove. Preferably, no matter what shape of the groove, the edge of the bottom of the groove is a fillet, the fillet can ensure the thickness of the edge, and meanwhile, the stress is dispersed, so that the forming quality of the shell is better.
As shown in fig. 2, the present application discloses a battery case, which is formed by a membrane 30 to be processed through a segmented pit punching, and has at least one target groove, each target groove corresponds to a preset processing region of the membrane 30 to be processed, and the preset processing regions are sequentially defined as a peripheral edge pressing region, a middle pressing region and a punching contact region from outside to inside; the sectional type punching pit comprises a first section punching pit, a second section punching pit and a third section punching pit, wherein the first section punching pit is a peripheral edge pressing region, and a groove with a first preset depth is formed in the punching contact region in a punching mode; the second section of punching pit is used for continuously punching the punching contact area and simultaneously gradually pressing the middle pressing area to form a groove with a second preset depth; and the third section of punching pits is used for continuously punching the punching contact area to form a target groove.
The battery shell is formed by punching three sections of pits, only a peripheral edge pressing area is compressed in the process of punching the pits in the first section, the area of the part which is not compressed is large in the middle of the peripheral edge pressing area and the area of the punching contact area, the thickness of the part which is punched with the pits and the thickness of the part which is not compressed fully share the tension, and the thickness of the part which is not compressed and the thickness of the four corners which are punched with the pits are uniform. And the middle pressing area can be gradually pressed in the second pit punching process until the second pit punching process is completed. Optionally, in the process of compressing the middle compression area, the pressure changes linearly with the depth of the punching pit, and may also change nonlinearly. In some embodiments, the method of compacting the intermediate compaction region can also be such that the intermediate compaction region is progressively compacted inwardly from the peripheral compaction region. The third section of punching pit is used for further finishing the punching shell under the condition of pressing the peripheral edge pressing area and the middle pressing area, so that the forming quality is improved. Because the middle pressing area is gradually compressed in the second pit punching process, the whole thickness difference is small after the pit punching is finished, the thickness of the four corner parts of the pit punching is thicker than that of the four corner parts of the pit punching in the conventional forming method, the problems of fish scale marks, wrinkles and the like generated in the pit punching process can be well avoided, and the inner wall of the formed shell is flat and smooth. Optionally, the battery case is made of an aluminum-plastic film, high-strength steel, a magnesium alloy, an aluminum alloy, high-performance plastic or a carbon fiber composite material, and the like.
In the embodiment of the present application, the diaphragm 30 to be processed has a predetermined temperature before being subjected to the segmental notching.
Specifically, waiting to process diaphragm 30 can improve plasticity through the mode of preheating before the shaping of dashing the hole, and the messenger dashes the hole shaping effect better, dashes the battery casing behind the shaping of hole and can not have the internal stress and lead to the casing to take place deformation, and the casing quality is higher.
In a possible embodiment, the preset temperature is between 30 ℃ and 60 ℃. Preferably, the preset temperature may be 45 ℃.
In the embodiment of the present application, the preheating temperature of the film 30 to be processed may be determined according to the material of the film 30 to be processed.
In a possible embodiment, the first predetermined depth is 0.25-0.35 times the target groove depth. For example, the first preset depth may be 0.3 times the depth of the target groove.
In a possible embodiment, the second predetermined depth is 0.9-0.95 times the depth of the target groove. For example, the second predetermined depth is 0.93 times the depth of the target groove.
In the embodiment of the application, the pit punching process is a continuous and uninterrupted process, and the compression pressure on the edge part in the pit punching process changes in a segmented manner according to the pit punching depth. Optionally, when the pit punching depth is 0.25-0.35 times of the target depth, the peripheral edge pressing region is pressed by selecting a constant pressure, then the middle pressing region is gradually pressed by selecting a variable pressure, and meanwhile, the second-stage pit punching is performed. And when the second section of pit punching is finished, the peripheral edge pressing area and the middle pressing area are both pressed, the pressure is not changed at the moment, and the third section of pit punching is carried out to trim the formed shell. Optionally, when the second stage of pit punching is completed, the pit punching depth reaches 0.9-0.95 times of the target depth.
In a possible embodiment, the target groove is a circular groove or a polygonal groove, the bottom edge of the target groove having rounded corners. For example, the target groove is a square groove.
In the embodiment of the application, the shape of the target groove can be determined according to the requirement of the battery shell in actual use, and optionally, the target groove is a circular groove and can also be a regular polygonal groove or a special-shaped groove. Preferably, no matter what shape of the groove, the edge of the bottom of the groove is a fillet, the fillet can ensure the thickness of the edge, and meanwhile, the stress is dispersed, so that the forming quality of the shell is better.
As shown in fig. 3 and 4 in combination with fig. 1 and 2, the present application discloses a battery case molding method including: performing first-section pit punching on a membrane 30 to be processed, wherein the membrane to be processed is provided with a preset processing area, the preset processing area is sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside, the first-section pit punching is used for pressing the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth; and performing second-stage pit punching on the membrane 30 to be processed, wherein the second-stage pit punching is to continue punching the punching contact area and gradually compress the middle compression area to form a groove with a second preset depth or directly form a target groove.
In the embodiment of the present application, the diaphragm 30 to be processed is formed into the battery case by punching, and the punching process is divided into multiple sections. The pit punching is performed after the pretreatment of the membrane 30 to be processed, wherein the pretreatment comprises the design of the size and the shape of the membrane and the like, and then the pit punching is performed at the first section. The processing area of the diaphragm is sequentially a peripheral edge pressing area, a middle pressing area and a stamping contact area from outside to inside. In the first section of pit punching process, the peripheral edge pressing area is firstly compacted to perform the first section of pit punching. And after the first section of pit punching reaches the preset depth, the second section of pit punching is started, the middle compression area is gradually compressed, and optionally, in the process of compressing the middle compression area, the pressure is linearly changed along with the pit punching depth or is nonlinearly changed. In some embodiments, the method of compacting the intermediate compaction region can also be such that the intermediate compaction region is progressively compacted inwardly from the peripheral compaction region. The second stage of pit punching process can directly reach the target pit punching depth to obtain the battery shell. In some embodiments, the casing with the second punched section may be further trimmed to make the formed battery casing of more stable quality.
When the second section of the punch pit is to form a groove having the second preset depth, the forming method further comprises: and performing third-stage pit punching on the diaphragm 30 to be processed, wherein the third-stage pit punching is to continuously punch the punching contact area to form a target groove.
In the embodiment of the application, after the second section of pit punching is completed, the peripheral compression area and the middle compression area are both compressed, and then the third section of pit punching can be performed to trim the formed shell.
In a possible embodiment, the first predetermined depth is 0.25-0.35 times the target groove depth. For example, the first predetermined depth is 0.3 times the depth of the target groove.
In the embodiment of the application, only the peripheral compression area is compressed in the first pit punching process, at the moment, the pit punching can be completed by 0.25-0.35 of the target depth, then the middle compression area starts to be compressed, and the second pit punching is performed at the same time. The second stage of pit punching can directly reach the target pit punching depth. In some embodiments, when the second stage of pit punching is completed, the pit punching depth reaches 0.9 to 0.95 of the target depth, and then the third stage of pit punching is performed to trim the whole formed shell so as to ensure the forming quality.
In a possible embodiment, the target groove may be a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner. For example, the target groove is a square groove.
In this application embodiment, the shape of target recess can be confirmed according to the demand when battery case in-service use, and is optional, and the target recess is circular slot, also can be regular polygon recess or special-shaped groove, and the bottom edge of target recess has the fillet. The groove shape of the punching pit and the round angle at the bottom can be obtained in the pit punching process by designing the shape of the pit punching convex die 11, and the later processing is not needed, so that the process cost is reduced.
In a possible embodiment, before the first stage of cratering the film sheet 30 to be processed, the method further comprises: the diaphragm 30 to be processed is brought to a preset temperature by passing through the temperature adjusting device 20.
In the embodiment of the application, before treating processing diaphragm 30 and dashing the hole, to the preheating process of diaphragm in addition, treat processing diaphragm 30 and preheat and can improve the plasticity of treating processing diaphragm 30, it is that the shaping quality is better.
In a possible embodiment, the heating means used by the thermostat 20 is radiation heating or contact heating.
In the embodiment of the present application, the heating mode of the temperature adjustment device 20 for the membrane 30 to be processed may be selected as radiation heating or contact heating, the radiation heating may make the membrane 30 to be processed heated more uniformly, the contact heating may improve the heat transfer efficiency, and the determination may be specifically performed according to the actual production situation.
In a possible embodiment, the preset temperature is between 30 ℃ and 60 ℃. Preferably, the preset temperature may be 45 ℃.
In the embodiment of the present application, the proper preheating temperature can be selected according to the material of the temperature adjusting device 20 and the membrane 30 to be processed.
As shown in fig. 5, the heating mode adopted by the temperature adjusting device 20 is radiation heating, and the distance between the membrane 30 to be processed and the temperature adjusting device 20 is 50mm-200 mm.
In the embodiment of the application, the preheating process can be selected as radiant heating, the preheating process is carried out in the conveying process of the membrane 30 to be processed, the production efficiency is not delayed, the pit punching process is also formed continuously in one step, the production efficiency is ensured, the yield of production is higher, and the production cost is lower. The distance between the membrane 30 to be processed and the temperature adjustment device 20 can be flexibly adjusted according to the environment and the heating capacity of the device. Alternatively, the temperature adjustment device 20 is an infrared radiation heating device installed such that the infrared radiation heating panel is parallel to the aluminum-plastic film, and the heating device includes a controller that controls the heating time and the heating temperature.
As shown in fig. 6, according to the above battery case forming method, the present application also discloses a stamping device for forming a battery case, comprising: a pit punching male die 11; the pit punching die comprises a lower concave die plate 12, wherein a pit is arranged on the lower concave die plate 12, the outline of the pit is regular or irregular, and the pit is matched with a pit punching convex die 11; the first compression template 13 is arranged at the upper part of the lower concave template 12 and is used for compressing the peripheral edge pressing area of the membrane 30 to be processed; and a second pressing template 14, wherein the second pressing template 14 is arranged at the upper part of the first pressing template 13 and is used for pressing the middle pressing area of the membrane 30 to be processed.
In the embodiment of the application, the stamping device comprises a pit punching male die 11 and a lower concave die plate 12 which are sequentially arranged from top to bottom; and a second compression template 14 and a first compression template 13 are sequentially arranged between the pit punching male die 11 and the lower female die from top to bottom. The concave template 12 is a 'back' shaped template, the concave template 12 is provided with a recess, the contour of the recess is regular shape or irregular shape, and the recess is matched with the pit punching convex die 11. The first pressing template 13 is arranged at the upper part of the lower concave template 12, the first pressing template 13 is used for pressing the membrane 30 to be processed, a first pit is arranged on the first pressing template 13, and the outline of the first pit is matched with the pit punching convex die 11; the second pressing template 14 is arranged at the upper part of the first pressing template 13, a second pit is arranged on the second pressing template 14, and the outline of the second pit is matched with the pit punching convex die 11. The profile of the first recess has a maximum distance from the edge of the first compression moulding plate 13, the maximum distance being 5mm-30 mm. The projection distance between the projection of the outer contour of the second compaction template 14 and the projection of the contour of the recess on the horizontal plane is 0.1mm-5 mm. The pit punching male die 11 is in clearance fit with the second pit, and the clearance distance between the second pit and the pit punching male die 11 is 1mm-5 mm. The surface roughness of the pit punching male die 11 is 1.0s-5.0 s. The surface roughness of the inner pressing cavity plate is 3.0 s.
In operation, the first pressing template 13 cooperates with the lower concave template 12 to press the outermost ring of the membrane 30 to be processed. The pit punching male die 11 is a pit punching forming die head, and when the pit punching forming die works, after the first compression die plate 13 and the lower concave die plate 12 are compressed, pit punching at a first section is started. The first process starts and ends when the pit punching convex die 11 starts from the original position to contact the membrane 30 to be processed to punch the pit to 0.25 to 0.35 times of the target depth. The second stage process starts and ends with the depth of the first stage punching completed and starts to the target depth. In some embodiments, the second stage process starts and ends with the first stage punch completed depth starting to 0.9 to 0.95 from the target depth. The third stage process is started and stopped by the second stage process from the pit punching depth to the target depth. The second pressing template 14 is also a 'back' shaped template, when the second section pit punching is performed in the working process, the second pressing template 14 starts to descend, and when the second section pit punching is completed, the second pressing template 14 and the lower concave template 12 are fastened.
The punching device further comprises a driving motor 15, the second pressing template 14 is connected with the driving motor 15, and the driving motor 15 is used for driving the second pressing template 14 to lift.
In the embodiment of the present application, the second pressing template 14 is connected to a driving motor 15, the driving motor 15 is used for driving the second pressing template 14 to ascend and descend, and the maximum stroke of the second pressing template 14 on the vertical surface interferes with the upper surface of the first pressing template 13. Alternatively, the first compression mold plate 13 includes a bottom plate and a side plate, and the driving motor 15 is disposed on the side plate. The drive motor 15 may also be provided on other mounting structures. The pit punching device for the diaphragm 30 to be processed further comprises a control system, and the control system is used for controlling the movement and the matching of all the components of the pit punching device for the diaphragm 30 to be processed.
As shown in fig. 3 and 4, the present embodiment exemplifies a method for forming a battery case by punching a pit, in conjunction with the punching apparatus. As shown in fig. 5, the aluminum-plastic film is preheated by the temperature adjusting device 20, the temperature adjusting device 20 is an infrared heat radiation device and is heated in the aluminum-plastic film conveying process, the heating device is controlled by a time relay and a temperature relay, the heating time is 5 seconds, and the temperature of the to-be-processed film 30 after radiation is required to be 45 ℃.
The plastic-aluminum film is preheated and then conveyed to a punching device. Firstly, the control system controls the whole punching mechanism to descend until the first compression template 13 is compressed with the lower concave template 12, and the compression pressure is required to be 1-5 Mpa. Then the pit punching male die 11 begins to descend to punch the pit in the first section. When the pit punching forming depth reaches 1/3 of the target depth, the driving motor 15 starts to work, the second compression template 14 is driven to descend, the descending speed is lower than that of the pit punching convex die 11, and meanwhile, the second-stage pit punching is carried out. At this time, the pit can be directly punched to the target depth, and the formed shell can be trimmed by punching the pit in a third section. If the third section of pit punching is carried out, when the forming depth of the pit punching is 0.5mm away from the target depth, the second compression template 14 is lowered and is compressed with the lower concave template 12, the pressure requirement is 1-5Mpa, and then the second section of pit punching is completed. And then, carrying out third-stage pit punching, continuously descending the pit punching male die 11 to the target depth, pressing the pit punching male die 11 plate and the lower concave die plate 12, wherein the pressure requirement is 1-5Mpa, delaying for 0.1-5s, then starting to ascend the pit punching male die 11 plate, and after delaying for 0.1-5s, starting to ascend the second pressing die plate 14 to the initial position to finish pit punching.
The pit punching forming process is a continuous pit punching process, pits are punched on the aluminum-plastic film through the forming process, after the pit punching of the first section is completed, the thickness of an aluminum layer of the aluminum-plastic film is more than 90% of the initial thickness, after the pit punching of the second section is completed, the thickness of an aluminum layer of the plastic film is more than 75% of the initial thickness, and after the pit punching of the third section is completed, the thickness of an aluminum layer of the plastic film is more than 70% of the initial thickness.
In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this disclosure, and are within the spirit and scope of the exemplary embodiments of this disclosure.
Furthermore, certain terminology has been used in this application to describe embodiments of the disclosure. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present disclosure. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the disclosure.
It should be appreciated that in the foregoing description of embodiments of the disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of the subject disclosure. Alternatively, various features may be dispersed throughout several embodiments of the application. This is not to be taken as an admission that any of the features of the claims are essential, and it is fully possible for a person skilled in the art to extract some of them as separate embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to less than all features of a single foregoing disclosed embodiment.
In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in certain instances by the term "about", "approximately" or "substantially". For example, "about," "approximately," or "substantially" can mean a ± 20% variation of the value it describes, unless otherwise specified. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.
Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.
Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art may implement the present application in alternative configurations according to the embodiments of the present application. Thus, embodiments of the present application are not limited to those embodiments described with accuracy in the application.
Claims (20)
1. A battery shell is characterized in that the shell is formed by a membrane to be processed through sectional pit punching, the shell is provided with at least one target groove, each target groove corresponds to a preset processing area of the membrane to be processed, and the preset processing areas are sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside;
the sectional type punching pit comprises a first section punching pit and a second section punching pit, wherein the first section punching pit is used for compacting the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth; and the second section of punching pit is used for continuously punching the punching contact area and gradually pressing the middle pressing area to form the target groove.
2. The battery housing of claim 1, wherein the diaphragm to be machined has a predetermined temperature prior to the segmented crater.
3. The battery case according to claim 2, wherein the preset temperature is 30 ℃ to 60 ℃.
4. The battery case of claim 3, wherein the first predetermined depth is 0.25-0.35 times the target groove depth.
5. The battery case as set forth in claim 4, wherein the target groove is a circular groove or a polygonal groove, and a bottom edge of the target groove has a rounded corner.
6. A battery shell is characterized in that the shell is formed by a membrane to be processed through sectional pit punching, the shell is provided with at least one target groove, each target groove corresponds to a preset processing area of the membrane to be processed, and the preset processing areas are sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside;
the sectional type punching pit comprises a first section punching pit, a second section punching pit and a third section punching pit, wherein the first section punching pit is used for compacting the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth; the second section of punching pit is used for continuously punching the punching contact area and gradually pressing the middle pressing area to form a groove with a second preset depth; the third section of the punching pit is used for continuously punching the punching contact area to form the target groove.
7. The battery housing of claim 6, wherein said diaphragm to be machined has a predetermined temperature prior to said segmented crater.
8. The battery case according to claim 7, wherein the preset temperature is 30 ℃ to 60 ℃.
9. The battery case of claim 8, wherein the first predetermined depth is 0.25-0.35 times the target groove depth; and/or the presence of a gas in the gas,
the second predetermined depth is 0.9-0.95 times the depth of the target groove.
10. The battery case as set forth in claim 9, wherein the target groove is a circular groove or a polygonal groove, and a bottom edge of the target groove has a rounded corner.
11. A method of forming a battery case, comprising:
performing first-section pit punching on a membrane to be processed, wherein the membrane to be processed is provided with a preset processing area, the preset processing area is sequentially defined as a peripheral edge pressing area, a middle pressing area and a punching contact area from outside to inside, the first-section pit punching is used for pressing the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth;
and performing second-section pit punching on the diaphragm to be processed, wherein the second-section pit punching is to continue punching the punching contact area and gradually compress the middle compression area to form a groove or a target groove with a second preset depth.
12. The battery case molding method of claim 11, wherein when the second section is dimpled to form a groove having the second predetermined depth, the molding method further comprises: and carrying out third-section pit punching on the diaphragm to be processed, wherein the third-section pit punching is to continuously punch the punching contact area to form a target groove.
13. The battery case molding method of claim 12, wherein the first predetermined depth is 0.25 to 0.35 times the target groove depth.
14. The battery case molding method according to claim 13, wherein the target groove is a circular groove or a polygonal groove, and a bottom edge of the target groove has a rounded corner.
15. The method for forming a battery shell according to claim 11, wherein before the punching the first section of the membrane to be processed, the method further comprises: and enabling the diaphragm to be processed to reach a preset temperature through a temperature adjusting device.
16. The method of claim 15, wherein the temperature adjustment device is heated by radiation or contact heating.
17. The method of forming a battery case according to claim 16, wherein the predetermined temperature is 30 ℃ to 60 ℃.
18. The method for molding the battery case according to claim 17, wherein the temperature adjustment device is heated by radiation, and the distance between the film to be processed and the temperature adjustment device is 50mm to 200 mm.
19. A stamping device for forming a battery housing, comprising:
a pit punching male die (11);
the pit punching die comprises a lower concave die plate (12), wherein a pit is arranged on the lower concave die plate (12), the outline of the pit is regular or irregular, and the pit punching convex die (11) is matched with the pit punching convex die;
the first compression template (13) is arranged at the upper part of the lower concave template (12) and is used for compressing the peripheral edge pressing area of the membrane (30) to be processed;
the second pressing template (14), the second pressing template (14) is arranged on the upper portion of the first pressing template (13) and is used for pressing the middle pressing area of the membrane (30) to be processed.
20. Stamping device according to claim 19, characterized in that the stamping device further comprises a drive motor (15), the second die plate (14) being connected to the drive motor (15), the drive motor (15) being adapted to drive the lifting of the second die plate (14).
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| CN201911147399.5A CN110712359B (en) | 2019-11-20 | 2019-11-20 | Battery shell, forming method thereof and stamping device |
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| CN201911147399.5A CN110712359B (en) | 2019-11-20 | 2019-11-20 | Battery shell, forming method thereof and stamping device |
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| CN114346070A (en) * | 2021-12-29 | 2022-04-15 | 宁波信泰机械有限公司 | Partition forming method for inner plate of automobile stand column |
| CN114552098A (en) * | 2020-11-24 | 2022-05-27 | 比亚迪股份有限公司 | Battery case and preparation method thereof |
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| CN110712359B (en) | 2024-03-29 |
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