CN110712359B - Battery shell, forming method thereof and stamping device - Google Patents
Battery shell, forming method thereof and stamping device Download PDFInfo
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- CN110712359B CN110712359B CN201911147399.5A CN201911147399A CN110712359B CN 110712359 B CN110712359 B CN 110712359B CN 201911147399 A CN201911147399 A CN 201911147399A CN 110712359 B CN110712359 B CN 110712359B
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- 238000000034 method Methods 0.000 title claims abstract description 75
- 238000004080 punching Methods 0.000 claims abstract description 243
- 238000003825 pressing Methods 0.000 claims abstract description 68
- 230000002093 peripheral effect Effects 0.000 claims abstract description 36
- 238000012545 processing Methods 0.000 claims abstract description 21
- 239000012528 membrane Substances 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 25
- 230000006835 compression Effects 0.000 claims description 23
- 238000007906 compression Methods 0.000 claims description 23
- 230000005855 radiation Effects 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 241000251468 Actinopterygii Species 0.000 abstract 1
- 230000008569 process Effects 0.000 description 42
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 25
- 229910052782 aluminium Inorganic materials 0.000 description 25
- 239000002985 plastic film Substances 0.000 description 21
- 229920006255 plastic film Polymers 0.000 description 21
- 238000005056 compaction Methods 0.000 description 15
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000001788 irregular 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
- 230000004075 alteration Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement 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
- 230000008439 repair process Effects 0.000 description 2
- 238000010112 shell-mould casting Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001427 coherent 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
- 238000013461 design Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 present disclosure relates to battery technology, and particularly to a battery case, a method for forming the battery case, and a stamping device for forming the battery case. The shell is formed by a diaphragm to be processed through sectional punching, and is provided with a preset processing area which is sequentially defined as a peripheral blank pressing area, a middle pressing area and a punching contact area from outside to inside; the sectional type punching pit comprises a first section of punching pit and a second section of punching pit, wherein the first section of punching pit is used for compacting the peripheral edge pressing area, and the punching contact area is punched 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 compacting the middle compacting area to form a target groove. Four bight thickness of casing that obtain through the multistage towards hole of this application are thicker to can avoid towards the fish scale pattern that the hole in-process produced, fold scheduling problem, make the shells inner wall after the shaping level and smooth.
Description
Technical Field
The present disclosure relates to battery technology, and particularly to a battery case, a method for forming the battery case, and a stamping device for forming the battery case.
Background
With the rapid development of electric vehicles, the energy density of lithium ion batteries is increasingly required. This has prompted the development of lithium ion power batteries toward high volume, high mass density. The aluminum plastic film is used as a core material of the soft package battery and plays a vital role in the performance of the battery. The aluminum plastic film is generally formed by pit punching, and along with the development trend of lithium ion battery technology, the requirements on pit punching quality of the aluminum plastic film are higher and higher, not only are pit punching depth with larger size required, but also the damage to the aluminum plastic film in the pit punching process is required to be very small.
At present, the pit punching of the aluminum plastic film is mainly realized by driving a pit punching die to move by a punching machine. Firstly, fixing an aluminum plastic film through a pressing mechanism, then, forming by matching a convex die with a concave die to form a pit, so that the periphery of the aluminum plastic film is extended to form a pit-shaped structure with a certain depth, in the pit punching forming process, the part positioned by the pressing mechanism cannot participate in forming deformation, only the part contacted with a die punch part is extended to form, and the thickness of a formed part is uneven and is extremely easy to break. The depth of the aluminum plastic film and the thickness of the aluminum layer at the corner of the punching pit are called bottlenecks for limiting the use of the aluminum plastic film.
Disclosure of Invention
The application aims to solve the technical problems that the pit punching forming depth and the pit punching corner aluminum layer thickness of an existing aluminum plastic film are low.
In order to solve the technical problems, in a first aspect, the present application discloses a battery housing, wherein the housing is formed by punching a diaphragm to be processed through a sectional type pit, the housing 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 area 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 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 compacting the middle compacting area at the same time to form the target groove.
Further, the film to be processed has a preset temperature before the segmented pit punching is performed.
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 is provided with a round corner.
In a second aspect, the application discloses a battery shell, wherein the shell is formed by punching a diaphragm to be processed through a sectional type pit, 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, 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 pit punching is used for continuously punching the punching contact area and gradually compacting the middle compacting area at the same time to form a groove with a second preset depth; and the third section of punching pit is used for continuously punching the punching contact area to form the target groove.
Further, the film to be processed has a preset temperature before the segmented pit punching is performed.
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 is provided with a round corner.
In a third aspect, the present application discloses a battery case molding method, comprising:
the method comprises the steps of carrying out first-section punching on a diaphragm to be processed, wherein the diaphragm 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 punching is used for pressing the peripheral edge pressing area, and the punching contact area is punched to form a groove with a first preset depth;
and carrying out second section pit punching on the membrane to be processed, wherein the second section pit punching is to continuously punch 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-stage pit is a groove with the second preset depth, the forming method further includes: and carrying out third section pit punching on the membrane to be processed, wherein the third section pit punching is used for continuously punching 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 is provided with a round corner.
Further, before the first section of pit punching is performed on the membrane to be processed, the method further comprises: and the membrane to be processed is subjected to a temperature adjusting device to reach a preset temperature.
Further, the heating mode adopted by the temperature regulating device is radiation heating or contact heating.
Further, the preset temperature is 30-60 ℃.
Further, the heating mode adopted by the temperature regulating device is radiation heating, and the distance between the membrane to be processed and the temperature regulating device is 50mm-200mm.
In a fourth aspect, the present application discloses a stamping device for battery case shaping, comprising:
punching a pit punch;
the concave template is provided with a concave, the outline of the concave is in a regular shape or an irregular shape, and the concave is matched with the pit punching male die;
the first compression template is arranged at the upper part of the concave template and used for compressing the peripheral edge pressing area of the membrane to be processed;
the second compaction template is arranged on the upper portion of the first compaction template and is used for compacting the middle compaction area of the membrane to be processed.
Further, the stamping device further comprises a driving motor, the second pressing template is connected with the driving motor, and the driving motor is used for driving the second pressing 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 according to the embodiment of the application, through multistage punching forming, only compress tightly peripheral blank holder region in the first section punching process, middle compressed region and punching contact region are not compressed region, and not compressed region area is big this moment, and the full share tension in punching hole part thickness and not compressed region makes not compressed portion and four bight thickness uniformity of punching hole. The second section of pit punching process can gradually compress the middle compression area, the whole thickness difference of the shell is not large after pit punching is finished, the thickness of four corners of the pit is thicker than that of the pit punching by the traditional forming method, and the problems of scale marks, wrinkles and the like generated in the pit punching process can be well avoided, so that the inner wall of the formed shell is smooth.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a battery housing according to one embodiment of the present application;
FIG. 2 is a schematic view of a battery housing molding according to one embodiment of the present application;
FIG. 3 is a schematic illustration of a battery case pit punching process according to one embodiment of the present application;
FIG. 4 is a schematic diagram of a battery case pit punching process according to one embodiment of the present application;
FIG. 5 is a schematic diagram of heating a membrane to be processed according to one embodiment of the present application;
fig. 6 is a schematic structural view of a stamping device according to another embodiment of the present application.
The following supplementary explanation is given to the accompanying drawings:
11-pit punching male die; 12-recessing the template; 13-a first compaction template; 14-a second compaction template; 15-driving a motor; 20-a temperature regulating device; 30-a 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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "upper," "lower," "top," "bottom," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the apparatus or elements in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
In order to solve the problem that the existing aluminum plastic film is uneven in pit punching forming thickness, the aluminum layer at the corner after forming is thin and is extremely easy to break. The application discloses a battery shell, as shown in fig. 1, the shell is formed by a diaphragm 30 to be processed through sectional type punching, the shell is provided with at least one target groove, each target groove corresponds to a preset processing area of the diaphragm 30 to be processed, and the preset processing area is sequentially defined as a peripheral blank pressing area, a middle pressing area and a punching contact area from outside to inside; the sectional type punching pit comprises a first section of punching pit and a second section of punching pit, wherein the first section of punching pit is used for compacting the peripheral edge pressing area, and the punching contact area is punched 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 compacting the middle compacting area at the same time to form a target groove.
The battery shell according to the embodiment of the application, through two sections towards hole shaping, first section towards hole in-process, only compress tightly peripheral blank holder region, and middle compressed region and punching contact area are not compressed tightly the district, and the area of not compressing tightly the position is big this moment, and towards hole part thickness and not compressing tightly the position abundant sharing tension, make not compressing tightly the part and towards four bight thickness uniformity of hole. The second-stage pit punching process gradually compresses the middle compression area until the second-stage pit punching is completed. Optionally, during the process of compacting the middle compaction region, the pressure changes linearly with the pit depth, and may also change nonlinearly. In some embodiments, the method of pinching the intermediate pinch-off region may also be to pinch off the intermediate pinch-off region gradually inward from the peripheral bead region. Because the middle compression area is gradually compressed in the pit punching process of the second section, the overall thickness difference is small after pit punching is finished, the thickness of four corners of the pit is thicker than that of the pit punching by the traditional forming method, and the problems of scale marks, wrinkles and the like generated in the pit punching process can be well avoided, so that the inner wall of the formed shell is flat and smooth. Optionally, the battery shell is made of an aluminum plastic film, high-strength steel, magnesium alloy, aluminum alloy, high-performance plastic or carbon fiber composite material and the like.
In the embodiment of the present application, the film 30 to be processed has a preset temperature before the sectional pit punching.
Specifically, the to-be-processed membrane 30 can improve plasticity in a preheating mode before being subjected to pit punching forming, so that pit punching forming effect is better, the battery shell after pit punching forming does not have internal stress to cause deformation of the shell, and the quality of the shell is higher.
In a possible embodiment, the preset temperature is between 30 ℃ and 60 ℃. Preferably, the preset temperature may be 45 ℃.
In this embodiment, the preheating temperature of the membrane 30 to be processed may be actually selected and determined according to factors such as the material of the membrane 30 to be processed.
In a possible embodiment, the first preset depth is 0.25-0.35 times the target groove depth. For example, the first preset depth is 0.3 times the target groove depth.
In the embodiment of the application, the pit punching process is a continuous and uninterrupted process, and the compression pressure of the opposite side part in the pit punching process is changed in a sectional 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 area is pressed by the fixed pressure, then the middle pressing area is gradually pressed by the variable pressure, and the second pit punching is performed.
In a possible embodiment, the target recess is a circular recess or a polygonal recess, the bottom edge of the target recess having rounded corners. For example, the target groove is a square groove.
In this embodiment of the present application, the shape of the target groove may be determined according to the requirement of the battery case in actual use, and optionally, the target groove may be a circular groove, or may 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 round angle, and the round angle can ensure the thickness of the edge and disperse stress at the same time, so that the shell molding quality is better.
As shown in fig. 2, the present application discloses a battery housing, wherein the housing is formed by a diaphragm 30 to be processed through sectional type pit punching, the housing has at least one target groove, each target groove corresponds to a preset processing area of the diaphragm 30 to be processed, and 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 sectional type punching pit comprises a first section of punching pit, a second section of punching pit and a third section of punching pit, wherein the first section of punching pit is a peripheral edge pressing area which is pressed, and the punching contact area is punched to form a groove with a first preset depth; the second section of pit punching is to continuously punch the punching contact area and gradually press the middle pressing area to form a groove with a second preset depth; and the third section of punching pit is used for continuously punching the punching contact area to form a target groove.
The battery shell according to the embodiment of the application, through three-section pit punching forming, in the pit punching process of the first section, only the peripheral edge pressing area is pressed, the middle pressing area and the stamping contact area are non-pressing areas, at the moment, the area of the non-pressing parts is large, the pit punching part thickness and the non-pressing parts fully share tension, and the non-pressing parts and the pit punching four corners are uniform in thickness. The second-stage pit punching process gradually compresses the middle compression area until the second-stage pit punching is completed. Optionally, during the process of compacting the middle compaction region, the pressure changes linearly with the pit depth, and may also change nonlinearly. In some embodiments, the method of pinching the intermediate pinch-off region may also be to pinch off the intermediate pinch-off region gradually inward from the peripheral bead region. The third section of punching pit is used for further trimming the punching shell under the condition of compressing the peripheral edge pressing area and the middle compressing area, so that the forming quality is improved. Because the middle compression area is gradually compressed in the pit punching process of the second section, the overall thickness difference is small after pit punching is finished, the thickness of four corners of the pit is thicker than that of the pit punching by the traditional forming method, and the problems of scale marks, wrinkles and the like generated in the pit punching process can be well avoided, so that the inner wall of the formed shell is flat and smooth. Optionally, the battery shell is made of an aluminum plastic film, high-strength steel, magnesium alloy, aluminum alloy, high-performance plastic or carbon fiber composite material and the like.
In the embodiment of the present application, the film 30 to be processed has a preset temperature before the sectional pit punching.
Specifically, the to-be-processed membrane 30 can improve plasticity in a preheating mode before being subjected to pit punching forming, so that pit punching forming effect is better, the battery shell after pit punching forming does not have internal stress to cause deformation of the shell, and the quality of the shell is higher.
In a possible embodiment, the preset temperature is 30-60 ℃. Preferably, the preset temperature may be 45 ℃.
In this embodiment, the preheating temperature of the membrane 30 to be processed may be actually selected and determined according to factors such as the material of the membrane 30 to be processed.
In a possible embodiment, the first preset depth is 0.25-0.35 times the target groove depth. For example, the first preset depth may be 0.3 times the target groove depth.
In a possible embodiment, the second preset depth is 0.9-0.95 times the target groove depth. For example, the second preset depth is 0.93 times the target groove depth.
In the embodiment of the application, the pit punching process is a continuous and uninterrupted process, and the compression pressure of the opposite side part in the pit punching process is changed in a sectional 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 area is pressed by the fixed pressure, then the middle pressing area is gradually pressed by the variable pressure, and the second 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 pressed, the pressure is not changed at the moment, and the third section of pit punching is carried out to repair the formed shell. Optionally, when the second section pit punching is completed, the pit punching depth reaches 0.9-0.95 times of the target depth.
In a possible embodiment, the target recess is a circular recess or a polygonal recess, the bottom edge of the target recess having rounded corners. For example, the target groove is a square groove.
In this embodiment of the present application, the shape of the target groove may be determined according to the requirement of the battery case in actual use, and optionally, the target groove may be a circular groove, or may 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 round angle, and the round angle can ensure the thickness of the edge and disperse stress at the same time, so that the shell molding quality is better.
As shown in fig. 3 and 4, and in combination with fig. 1 and 2, the present application discloses a battery case forming method, including: the method comprises the steps of carrying out first-stage punching on a diaphragm 30 to be processed, wherein the diaphragm to be processed is provided with a preset processing area, the preset processing area is sequentially defined into a peripheral blank pressing area, a middle pressing area and a punching contact area from outside to inside, the first-stage punching is used for pressing the peripheral blank pressing area, and the punching contact area is punched to form a groove with a first preset depth; and (3) carrying out second-stage pit punching on the membrane 30 to be processed, wherein the second-stage pit punching is to continuously punch the punching contact area, and gradually compacting the middle compaction area to form a groove with a second preset depth or directly form a target groove.
In the embodiment of the application, the membrane 30 to be processed is punched to obtain a battery shell, and the punching process is divided into a plurality of sections. The membrane 30 to be processed is pre-treated, including the size, shape design, etc. of the membrane, followed by a first stage of pit punching. The processing area of the diaphragm is sequentially provided with a peripheral edge pressing area, a middle pressing area and a stamping contact area from outside to inside. In the first section pit punching process, the peripheral edge pressing area is firstly pressed, and the first section pit punching is carried out. After the first section pit punching reaches the preset depth, the second section pit punching is started, and the middle compression area is gradually compressed at the moment, and optionally, the pressure is linearly changed along with the pit punching depth or can be non-linearly changed in the process of compressing the middle compression area. In some embodiments, the method of pinching the intermediate pinch-off region may also be to pinch off the intermediate pinch-off region gradually inward from the peripheral bead region. The second pit punching process can directly reach the target pit punching depth to obtain the battery shell. In some embodiments, the shell that completes the second stage pit may be further trimmed, which is a molded battery shell of more consistent quality.
When the second section of pit is formed with the groove with the second preset depth, the forming method further comprises the following steps: and (3) carrying out third-stage pit punching on the membrane 30 to be processed, wherein the third-stage pit punching is used for continuously punching the punching contact area to form a target groove.
In this application embodiment, after accomplishing the second section towards the hole, peripheral compaction region and middle compaction region are all compressed tightly, can also carry out the third section towards the hole and repair the shaping casing this moment.
In a possible embodiment, the first preset depth is 0.25-0.35 times the target groove depth. For example, the first preset depth is 0.3 times the target groove depth.
In the embodiment of the application, in the pit punching process of the first section, only the peripheral compaction area is compacted, at this time, 0.25 to 0.35 of the pit punching target depth can be completed, then the middle compaction area is compacted, and the pit punching of the second section is performed simultaneously. The second section of pit punching can directly reach the target pit punching depth. In some embodiments, when the second stage pit is completed, the pit depth reaches 0.9 to 0.95 of the target depth, and then the third stage pit is trimmed to the entire molded shell to ensure the molding quality.
In a possible embodiment, the target recess may be a circular recess or a polygonal recess, the bottom edge of the target recess having rounded corners. For example, the target groove is a square groove.
In this embodiment of the application, the shape of target recess can be confirmed according to the demand when battery case in-service use, and optionally, the target recess is the circular slot, also can be regular polygon recess or dysmorphism recess, and the bottom edge of target recess has the fillet. The groove shape of the pit punching and the round angle at the bottom can be obtained in the pit punching process by designing the shape of the pit punching male die 11, so that the later processing is not needed, and the process cost is reduced.
In a possible embodiment, before the first stage pit punching of the membrane 30 to be processed, further comprises: the membrane 30 to be processed is passed through the temperature regulating device 20 to reach a preset temperature.
In the embodiment of the application, before the diaphragm 30 to be processed is punched, a preheating process of the diaphragm is further provided, and the diaphragm 30 to be processed is preheated to improve the plasticity of the diaphragm 30 to be processed, so that the forming quality is better.
In a possible embodiment, the temperature regulating device 20 is heated by radiation heating or contact heating.
In this embodiment, the heating mode of the temperature adjusting device 20 to the membrane 30 to be processed may be radiation heating or contact heating, the radiation heating may make the membrane 30 to be processed heated more uniformly, and the contact heating may improve the heat transfer efficiency, which may be specifically determined 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 this embodiment, a suitable preheating temperature may 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 temperature adjusting device 20 adopts a radiation heating mode, and the distance between the membrane 30 to be processed and the temperature adjusting device 20 is 50mm-200mm.
In this embodiment of the application, the preheating process can be selected to be radiation type heating, and is carried out in the conveying process of the membrane 30 to be processed, so that no delay is caused to the production efficiency, and the pit punching process is also coherent one-step forming, so that 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 regulating device 20 can be flexibly adjusted according to the environment and the heating capacity of the device. Optionally, the temperature adjusting device 20 is an infrared radiation heating device, and the installation position of the temperature adjusting device is that an infrared radiation heating panel is parallel to the aluminum plastic film, and the heating device comprises a controller, and the controller can control heating time and heating temperature.
As shown in fig. 6, according to the above method for forming a battery case, the present application also discloses a stamping device for forming a battery case, including: a pit punching male die 11; the lower die plate 12 is provided with a concave, the outline of the concave is in a regular shape or an irregular shape, and the concave is matched with the pit punching male die 11; a first pressing die plate 13, wherein the first pressing die plate 13 is arranged at the upper part of the concave die plate 12 and is used for pressing the peripheral edge pressing area of the membrane 30 to be processed; and a second pressing die plate 14, the second pressing die plate 14 being disposed at an upper portion of the first pressing die plate 13 for pressing a middle pressing region of the diaphragm 30 to be processed.
In the embodiment of the application, the stamping device comprises a pit stamping male die 11 and a lower female die plate 12 which are sequentially arranged from top to bottom; the second compaction template 14 and the first compaction template 13 are sequentially arranged between the pit punching male die 11 and the lower female die from top to bottom. The concave die plate 12 is a reverse-U-shaped die plate, the concave die plate 12 is arranged on the lower die plate 12, the outline of the concave is regular or irregular, and the concave is matched with the pit punching male die 11. The first compression template 13 is arranged on the upper part of the concave template 12, the first compression template 13 is used for compressing the membrane 30 to be processed, a first pit is arranged on the first compression template 13, and the outline of the first pit is matched with the pit punching male die 11; the second compacting die plate 14 is arranged on the upper part of the first compacting die plate 13, and a second pit is arranged on the second compacting die plate 14, and the outline of the second pit is matched with the pit punching male die 11. The contour of the first pit has a maximum distance from the edge of the first compression plate 13 of 5mm-30mm. The projection distance between the projection of the outer contour of the second compacting die plate 14 on the horizontal plane and the projection distance between the contour of the recess on the horizontal plane are 0.1mm-5mm. The pit punching male die 11 is in clearance fit with a second pit, and the clearance distance between the second pit and the pit punching male die 11 is 1mm-5mm. The surface roughness of the pit punch 11 is 1.0s-5.0s. The surface roughness of the press-in concave mold plate was 3.0s.
In operation, the first pressing die plate 13 is first matched with the concave die plate 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 male die works, after the first compression die plate 13 and the lower concave die plate 12 are compressed, the first pit punching is started. This first stage process starts from the start of the pit punch 11 to the point of contacting the diaphragm 30 to be processed to a depth of 0.25 to 0.35 times the target depth. The second stage process starts and ends with the first stage stamping completion depth beginning to a distance from the target depth. In some embodiments, the second stage process starts and ends at a depth at which the first stage stamping is completed to a distance of 0.9 to 0.95 from the target depth. The third stage process starts and ends with the second stage process flushing pit depth to the target depth. The second compression mold plate 14 is a back-shaped mold plate, and the second compression mold plate 14 starts to descend when the second section pit is punched in working, and the second compression mold plate 14 and the lower die plate 12 are clamped when the second section pit is punched.
The stamping device further comprises a driving motor 15, the second pressing die plate 14 is connected with the driving motor 15, and the driving motor 15 is used for driving the second pressing die plate 14 to lift.
In this embodiment, the second compacting die plate 14 is connected with a driving motor 15, and the driving motor 15 is used for driving the second compacting die plate 14 to lift, and the maximum travel of the second compacting die plate 14 on the vertical surface interferes with the upper surface of the first compacting die plate 13. Alternatively, the first compression molding 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 arranged on other mounting structures. The device for punching the pit of the diaphragm 30 to be processed further comprises a control system, wherein the control system is used for controlling movement and cooperation of each component structure of the device for punching the pit of the diaphragm 30 to be processed.
As shown in fig. 3 and 4, the embodiment of the present application exemplifies a pit molding method of a battery case in combination with the above-described punching device. As shown in fig. 5, the temperature adjusting device 20 is first used to preheat the aluminum plastic film, the temperature adjusting device 20 is an infrared heat radiation device, the aluminum plastic film is heated in the conveying process, the heating device is controlled by a time relay and a temperature relay in a double manner, the heating time is 5 seconds, and the temperature of the film 30 to be processed after radiation is required to be 45 ℃.
The aluminum plastic film is preheated and then conveyed into a stamping device. Firstly, the control system controls the whole stamping mechanism to descend to the first compression template 13 to be compressed with the lower concave die plate 12, and the compression pressure is required to be 1-5Mpa. Then the pit punch 11 starts to descend, and the first-stage pit punching is performed. When the pit forming depth reaches 1/3 of the target depth, the driving motor 15 starts to work, drives the second compaction die plate 14 to descend at a lower speed than the pit punching male die 11, and simultaneously performs the second-stage pit punching. At the moment, the pit can be punched directly to the target depth, and the third section of pit punching can also be performed to trim the formed shell. If the third stage pit punching is performed, when the pit punching forming depth is 0.5mm away from the target depth, the second compression template 14 is lowered to compress the lower die plate 12, and the pressure requirement is 1-5Mpa, so that the second stage pit punching is completed. And then the third section of pit punching is carried out, the pit punching male die 11 continues to descend to the target depth, the pit punching male die 11 plate and the concave die plate 12 are pressed, the pressure requirement is 1-5Mpa, after the time delay is 0.1-5s, the pit punching male die 11 plate starts to ascend, and after the time delay is 0.1s-5s, the second pressing die plate 14 also starts to ascend to the initial position, so that pit punching is completed.
The pit punching forming process is a continuous pit punching process, the pit punching is carried out on the aluminum plastic film through the forming process, the thickness of the aluminum plastic film aluminum layer is more than 90% of the initial thickness after the pit punching of the first section is completed, the thickness of the plastic film aluminum layer is more than 75% of the initial thickness after the pit punching of the second section is completed, and the thickness of the plastic film aluminum layer is more than 70% of the initial thickness after the pit punching of the third section is completed.
In view of the foregoing, it will be evident to a person skilled in the art that the foregoing detailed disclosure may be presented by way of example only and may not be limiting. Although not explicitly described herein, those skilled in the art will appreciate that the present application is intended to embrace a variety of reasonable alterations, improvements and modifications to the embodiments. Such alterations, improvements, and modifications are intended to be proposed by this disclosure, and are intended to be within the spirit and scope of the exemplary embodiments of this disclosure.
Furthermore, certain terms in the present application have been used to describe embodiments of the present 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 may be included in at least one embodiment of the present disclosure. Thus, 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 present disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure. Alternatively, the present application is directed to various features that are dispersed throughout a plurality of embodiments of the present application. However, this is not to say that a combination of these features is necessary, and it is entirely possible for a person skilled in the art to extract some of them as separate embodiments to understand them at the time of reading this application. That is, embodiments in this application may also be understood as an integration of multiple secondary embodiments. While each secondary embodiment is satisfied by less than all of the features of a single foregoing disclosed embodiment.
In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the present application are to be understood as being modified in some instances by the term "about," approximately, "or" substantially. For example, unless otherwise indicated, "about," "approximately," or "substantially" may mean a change in a value of ±20% of what it describes. 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 the 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 disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.
Each patent, patent application, publication of patent application, and other materials, such as articles, books, specifications, publications, documents, articles, etc., cited herein are hereby incorporated by reference. The entire contents for all purposes, except for any prosecution file history associated therewith, may be any identical prosecution file history inconsistent or conflicting with this file, or any identical prosecution file history which may have a limiting influence on the broadest scope of the claims. Now or later in association with this document. For example, if there is any inconsistency or conflict between the description, definition, and/or use of terms associated with any of the incorporated materials, the terms in the present document shall prevail.
Finally, it is to 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 embodiments disclosed herein are by way of example only and not limitation. Those skilled in the art can adopt alternative configurations to implement the applications herein according to embodiments herein. Thus, embodiments of the present application are not limited to what has been described in the application precisely.
Claims (15)
1. The battery shell is characterized in that the shell is formed by a diaphragm to be processed through sectional 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; the second section of punching pit is used for continuously punching the punching contact area and gradually compacting the middle compacting area at the same time to form the target groove; the film to be processed has a preset temperature before the sectional pit punching.
2. The battery housing of claim 1, wherein the predetermined temperature is 30 ℃ to 60 ℃.
3. The battery housing of claim 2, wherein the first predetermined depth is 0.25-0.35 times the target groove depth.
4. The battery case according to claim 3, wherein the target groove is a circular groove or a polygonal groove, and a bottom edge of the target groove has rounded corners.
5. The battery shell is characterized in that the shell is formed by a diaphragm to be processed through sectional 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, 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 pit punching is used for continuously punching the punching contact area and gradually compacting the middle compacting area at the same time to form a groove with a second preset depth; the third section of punching pit is used for continuously punching the punching contact area to form the target groove; the film to be processed has a preset temperature before the sectional pit punching.
6. The battery housing of claim 5, wherein the predetermined temperature is 30 ℃ to 60 ℃.
7. The battery housing of claim 6, wherein the first predetermined depth is 0.25-0.35 times the target groove depth; and/or the second preset depth is 0.9-0.95 times of the depth of the target groove.
8. The battery case of claim 7, wherein the target groove is a circular groove or a polygonal groove, and a bottom edge of the target groove has rounded corners.
9. A battery case molding method, comprising:
the method comprises the steps of carrying out first-section punching on a diaphragm to be processed, wherein the diaphragm 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 punching is used for pressing the peripheral edge pressing area, and the punching contact area is punched to form a groove with a first preset depth;
a second section of pit punching is carried out on the membrane to be processed, wherein the second section of pit punching is to continuously punch the punching contact area, and meanwhile, the middle compression area is gradually compressed to form a groove or a target groove with a second preset depth; before the first section of pit punching is carried out on the membrane to be processed, the method further comprises the following steps: and the membrane to be processed is subjected to a temperature adjusting device to reach a preset temperature.
10. The battery case molding method according to claim 9, wherein when the second-stage pit is formed to have the groove of the second preset depth, the molding method further comprises: and carrying out third section pit punching on the membrane to be processed, wherein the third section pit punching is used for continuously punching the punching contact area to form a target groove.
11. The battery case molding method according to claim 10, wherein the first preset depth is 0.25 to 0.35 times the target groove depth.
12. The battery case molding method according to claim 11, wherein the target groove is a circular groove or a polygonal groove, and a bottom edge of the target groove has rounded corners.
13. The method of claim 9, wherein the temperature adjusting device is heated by radiation or contact heating.
14. The method of claim 13, wherein the predetermined temperature is 30 ℃ to 60 ℃.
15. The method for forming a battery case according to claim 14, wherein the temperature adjusting device adopts a radiation heating mode, and the distance between the membrane to be processed and the temperature adjusting device is 50mm-200mm.
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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 |
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| JP5610318B2 (en) * | 2012-11-08 | 2014-10-22 | 有限会社北鉄工所 | Press molding apparatus and press molding method |
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| EP0310726A1 (en) * | 1986-09-17 | 1989-04-12 | Cmb Packaging S.A. | Manufacturing method of conical metal boxes and tool for carrying out this method |
| JPH11348130A (en) * | 1998-06-10 | 1999-12-21 | Dainippon Printing Co Ltd | Laminating apparatus for producing card |
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