Special-shaped pole piece cold pressing die for thermal battery

Abstract

The utility model discloses a special-shaped pole piece cold pressing die for a thermal battery. The special-shaped pole piece cold pressing die comprises a lower pressing die, a die frame, an upper pressing die and a stripping die, wherein the center of the die frame is provided with a special-shaped process groove, the upper pressing die and the lower pressing die are respectively provided with a special-shaped boss, and the special-shaped process groove is axially matched with the special-shaped bosses of the upper pressing die and the lower pressing die to form a tabletting die assembly. The stripping die is provided with a special-shaped groove, and the upper pressing die, the die frame and the stripping die are assembled to form a stripping die assembly. The thermal battery powder cold pressing die fills up the industry blank that existing thermal battery powder cold pressing dies are all round, meanwhile, automatic stripping can be achieved after pole pieces are pressed, the preparation process is simple, production efficiency is high, and the thermal battery powder cold pressing die is very suitable for batch production.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field especially for powder material is pressed into the cold pressure mould of special section pole piece and solves the problem that the current powder pressing mould demoulding process is complex. BACKGROUND

[0002] At present, the powder cold pressure mould of common thermal battery is all circular mould, for example, positive and negative pole pressing mould, heating sheet pressing mould and the like.The defects of the existing circular mould are: (1) when the design space of product is square or special-shaped space, the utilization rate of space will be reduced by using circular pole piece; (2) the demoulding process of the existing circular pressing mould mostly adopts manual material withdrawal, and the material withdrawal process is complex and the production efficiency is low, which cannot satisfy large-scale production; (3) when special-shaped pole piece is required for some special applications, the existing circular pressing mould cannot meet the requirements.For example, the heating sheet of thermal battery needs rectangular pole piece sample when conducting burning rate test, and the existing method is to first press into circular pole piece and then manually cut into rectangle, on the one hand, heating powder is very sensitive to static electricity, and the static electricity generated in the cutting process has the risk of ignition, which has great safety hidden danger; on the other hand, if the strength of pole piece is not enough, manual cutting is easy to damage the original complete pole piece, and even causes pole piece fracture, edge cracking and other problems; even if the strength of pole piece is enough, the error generated by manual cutting is large, which cannot accurately ensure the consistency of shape, size, weight and other parameters between parallel samples, and finally affects the test result. CONTENT OF THE UTILITY MODEL

[0003] The special-shaped pole piece cold pressure mould assembly for thermal battery according to the utility model fills up the industry gap that the existing pressing mould is all circular pole piece.Through combination and replacement of various components, the function of the mould can be quickly switched between the pressing mould assembly and the material withdrawal mould assembly, and the operation process is simple, the material is automatically withdrawn by machine, high-quality special-shaped pole pieces with different thickness, shape and layer number can be prepared, and the special-shaped pole piece cold pressure mould assembly is very suitable for batch production.

[0004] The special-shaped pole piece cold pressure mould assembly for thermal battery according to the utility model includes a lower pressing mould, a mould frame, an upper pressing mould and a material withdrawal mould, the operation process is simple, the mould has high versatility, special-shaped pole pieces can be prepared by filling powder materials with different quality and applying certain pressure and time, and the shape, thickness and layer number of the pole pieces can be controlled.

[0005] The special-shaped pole piece cold pressure mould for thermal battery includes a lower pressing mould, a mould frame, an upper pressing mould and a material withdrawal mould, the mould structure is designed ingeniously, special-shaped pole pieces can be prepared by filling powder materials with different quality and applying certain pressure and time, the shape and thickness of the pole pieces can be controlled, and the pole pieces can be easily and quickly demoulded through the material withdrawal mould.

[0006] Specifically, the present invention adopts the following technical solution:

[0007] Cold pressing mold for irregularly shaped electrodes for thermal batteries, including:

[0008] A lower die, the lower die including a lower die base and a lower die irregular boss located on the lower die base;

[0009] A mold frame, the mold frame including a base, an irregularly shaped process groove located in the middle of the base and penetrating the base, and a positioning through hole located at the edge of the base;

[0010] The upper die includes an upper die base and an upper die irregular boss located on the upper die base; and

[0011] The stripping die includes a base plate, a shaped groove, and positioning pins.

[0012] The lower die irregular boss and the upper die irregular boss each have the same cross-sectional shape as the irregular process groove of the mold frame; the irregular bosses of the lower die and the upper die are axially fitted with the irregular process groove of the mold frame to form a tableting mold assembly;

[0013] The positioning pin of the stripping die matches the positioning through hole of the mold frame, and the irregular groove has a shape greater than or equal to the irregular process groove of the mold frame; the upper pressure die, the mold frame, and the stripping die are assembled into a stripping die assembly.

[0014] Furthermore, the irregularly shaped bosses of the upper and lower dies are clearance-fitted with the irregularly shaped process grooves of the mold frame. That is, when the irregularly shaped bosses of the lower and upper dies are axially fitted with the irregularly shaped process grooves of the mold frame, there is a gap between the irregularly shaped process grooves and the edges of the irregularly shaped bosses of the upper and lower dies, and the gap is less than or equal to the particle size of the powder used.

[0015] Furthermore, the height of the irregular boss in the lower die is less than the height of the die frame.

[0016] Furthermore, the height of the irregular boss in the upper die is greater than the height of the irregular boss in the lower die, and is also greater than the height of the die frame.

[0017] Specifically, after the irregular boss of the lower die is fitted with the mold frame, the irregular cavity formed is the filling cavity, and the height of the cavity is the filling height.

[0018] Specifically, the height difference between the irregular boss of the upper die and the height of the die frame is the stripping height, which is greater than 0.5mm.

[0019] Furthermore, the number and size of the locating pins of the stripper die are matched with the locating through holes of the die frame.

[0020] Specifically, the shape of the positioning through hole and the positioning pin is generally circular in consideration of the convenience of operation.

[0021] Specifically, the number of the positioning pin and the positioning through hole is ≤4, preferably ≤2.

[0022] Further, the size of the special-shaped recess of the stripping die is much larger than the size of the special-shaped boss of the upper pressing die; the depth of the groove is much larger than the filling height.

[0023] Specifically, the size of the special-shaped recess of the stripping die is more than 1mm larger than the size of the special-shaped boss of the upper pressing die, and the depth of the groove is more than 2mm larger than the filling height.

[0024] Specifically, the size of the special-shaped recess is more than 1mm larger than the size of the special-shaped boss, and the depth of the groove is more than 2mm larger than the filling height.

[0025] Further, the cross-sectional shape of the special-shaped recess of the stripping die is any one of a rectangle, a square, a triangle, an ellipse or a pentagon.

[0026] Further, the cross-sectional shape of the special-shaped recess of the stripping die is any one of a rectangle, a square, a triangle, an ellipse or a pentagon.

[0027] Further, the upper pressing die and the lower pressing die respectively have a U-shaped groove located at the edge of the bottom support.

[0028] Compared with the prior art, the utility model has at least the following beneficial effects:

[0029] The special-shaped pole piece cold pressing die assembly for thermal batteries of the utility model, comprising a lower pressing die, a die frame, an upper pressing die and a stripping die, when the tablet pressing die assembly is used, the special-shaped process groove of the die frame is vertically sleeved on the special-shaped boss of the lower pressing die, the cavity formed is filled with powder, and then the upper pressing die is placed for tablet pressing; when the stripping die assembly is used, the upper pressing die, the die frame and the pressed pole piece are horizontally placed, the positioning pin of the stripping die is vertically placed in cooperation with the positioning through hole of the die frame, and the machine is automatically stripped by the pressing machine. BRIEF DESCRIPTION OF DRAWINGS

[0030] The above and other objects, features and advantages of the utility model will be more apparent from the following description of the embodiments of the utility model with reference to the drawings, in which:

[0031] Figure 1 A three-dimensional structure view of the tablet pressing die assembly for thermal battery special-shaped pole pieces according to the utility model is shown.

[0032] Figure 2A three-dimensional perspective view of the hot battery special-shaped pole piece stripping die assembly is shown according to the utility model.

[0033] Figure 3 A sectional view of the tabletting die assembly in a working state according to one embodiment of the utility model is shown.

[0034] Figure 4 A sectional view of the stripping die assembly in a working state according to one embodiment of the utility model is shown. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings, and it should be noted that all the technical and scientific terms used in the present text are the same as the meanings commonly understood by the technicians in the technical field to which the utility model belongs. It should also be noted that unless otherwise explicitly specified and limited, the terms "place", "match", "align", "combine", "sleeve in" should be understood broadly. The terms used in the specification of the utility model in the present text are only for the purpose of describing the specific embodiments and are not intended to limit the utility model.

[0036] It should also be noted that in the description of the utility model, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "vertical", "horizontal", "top", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the indicated devices or elements to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0037] The utility model discloses a cold pressing die assembly for hot battery special-shaped pole piece, including the lower pressure mould of design with special-shaped boss, the mould frame of having special-shaped process groove and positioning through -hole in the middle, the upper pressure mould of design with special-shaped boss, and the stripping die of being provided with special-shaped recess and positioning pin. The size of the special-shaped boss of upper and lower pressure mould and the size gap cooperation of the special-shaped process groove of mould frame, the number and size of the positioning pin of stripping die and the number and size of the positioning through -hole in mould frame match, and the size of the special-shaped recess of stripping die is greater than the size of the special-shaped boss of upper pressure mould. Through the utility model can prepare special-shaped pole piece, and machine stripping is easily realized simultaneously, and the operation is convenient, and it is very suitable for commercial batch production.

[0038] Referring to the accompanying Figure 1 and the accompanying Figure 2 , the cold pressing die assembly for hot battery special-shaped pole piece of the utility model includes lower pressure mould (10), mould frame (20), upper pressure mould (30), stripping die (40).

[0039] The lower pressure mould (10) is equipped with bottom support (11), special-shaped boss (12), U-shaped groove (13);

[0040] The mold frame (20) is provided with a base body (21), a special-shaped process groove (22), and a positioning through hole (23);

[0041] The upper pressing mold (30) is provided with a bottom support (31), a special-shaped boss (32), and a U-shaped groove (33);

[0042] The special-shaped boss of the upper and lower pressing molds and the special-shaped process groove of the mold frame are gap-fitted, so that the powder cannot leak out and the upper and lower pressing molds can be smoothly disassembled and assembled.

[0043] The stripper mold (40) is provided with a bottom plate (41), a special-shaped groove (42), and a positioning pin (43);

[0044] The number of the positioning pins of the stripper mold is the same as that of the positioning through holes of the mold frame, and the shapes are matched;

[0045] The size of the special-shaped groove of the stripper mold is greater than that of the special-shaped boss of the upper pressing mold, so that the edges of the pole piece after stripping are complete and undamaged.

[0046] In the process of pressing the powder into a special-shaped pole piece, the conventional sequence is filling, pressing, stripping, and forming a piece. Referring to Figure 3 and Figure 4 , the specific working process of the hot battery special-shaped cold pressing mold assembly of the utility model is as follows:

[0047] S1, place the lower pressing mold (10) on the horizontal table top, keep the special-shaped boss (12) facing up, and put the special-shaped process groove (22) of the mold frame (20) into the special-shaped boss of the lower pressing mold, and the two are combined to form an open special-shaped cavity;

[0048] S2, pour a certain amount of solid powder into the cavity, and use a clean scraper to flatten the powder in the cavity. If multiple materials are pressed into one, repeat this step;

[0049] S3, slowly and vertically put the special-shaped boss (32) of the upper pressing mold (30) into the special-shaped process groove of the mold frame, at this time, the special-shaped boss of the upper pressing mold will be partially exposed above the mold frame, at this time, the pressing mold assembly is complete, and the powder pressing work state is entered;

[0050] S4, place the above-mentioned combined pressing mold assembly into the pressing machine, under a certain pressure, keep for a certain time, and ensure that the powder is cold-pressed into a special-shaped pole piece (50) with a certain thickness or / and mechanical strength. The pressure and pressure holding time can be set according to the actual situation;

[0051] S5, after the pressure of the pressing machine is released, take out the tablet pressing mold, manually turn the whole mold assembly by 180°, and at the same time, the lower pressing mold is turned from the lowermost to the uppermost;

[0052] S6, the positioning pin (43) of the stripping die (40) is aligned with the positioning hole (23) of the mold frame, at this time the stripping die assembly is assembled, and then the working state of the pole piece stripping is entered;

[0053] S6, the whole set of mold is sent into the press again, appropriate pressure is applied, and the stripping die drives the mold frame to move downward under the action of the pressure until the upper pressing die is contacted and ended;

[0054] S7, when the press is depressurized, the uppermost stripping die is taken down, at this time the pole piece (50) formed by pressing in the mold frame is ejected by the special-shaped boss of the upper pressing die, and the complete special-shaped pole piece is obtained after being manually taken down.

[0055] The upper pressing die and the lower pressing die in the embodiment of the utility model design a specific embodiment (such as Figure 1 and 2 indicated) with a U-shaped groove, so as to avoid that the interface of the lower pressing die / mold frame and the upper pressing die / mold frame is too tightly fitted, and the mold cannot be taken down. However, in some other embodiments, the "U" shaped groove can also not be designed, and other structure forms facilitating the stripping operation can also be used.

[0056] In conclusion, the hot battery special-shaped pole piece cold pressing mold has very wide applicability, and can be used for preparing special-shaped pole pieces with different thicknesses, single layers or multiple layers, and has no special requirements for the physical and chemical properties of the powder, and is suitable for commercial production.

[0057] The above content is only for describing the technical idea of the utility model, and cannot limit the protection range of the utility model, and any change made according to the technical idea of the utility model on the basis of the technical scheme falls within the protection range of the utility model claim.

Claims

1. A cold pressing mold for irregularly shaped electrodes used in thermal batteries, characterized in that, The application relates to a tabletting die assembly, which comprises: a lower punch (10) comprising a lower punch base (11) and a lower punch profile boss (12) on the lower punch base; a die frame (20) comprising a base (21), a profiled process groove (22) in the middle of the base and penetrating through the base, and positioning through holes (23) on the edge of the base; an upper punch (30) comprising an upper punch base (31) and an upper punch profile boss (32) on the upper punch base; and a stripper die (40) comprising a base plate (41), a profiled recess (42) and positioning pins (43), wherein the lower punch profile boss and the upper punch profile boss have the same cross-sectional shape as the profiled process groove of the die frame; the profiled bosses of the lower punch and the upper punch axially match with the profiled process groove of the die frame to assemble the tabletting die assembly; the positioning pins of the stripper die match with the positioning through holes of the die frame, the profiled recess has a shape greater than or equal to that of the profiled process groove of the die frame; the upper punch, the die frame and the stripper die are assembled into a stripper die assembly.

2. The mold of claim 1, wherein The cross-sectional shape of the upper punch profile boss, the lower punch profile boss and the profiled process groove is any one of a rectangle, a square, a triangle, an ellipse or a pentagon.

3. The mold of claim 1, wherein The upper punch and the lower punch respectively have U-shaped grooves on the edge of the base.

4. The mold of claim 1, wherein The profiled recess of the stripper die has any one of a rectangle, a square, a triangle, an ellipse or a pentagon.

5. The mold of claim 1, wherein, When the profiled bosses of the lower punch and the upper punch axially match with the profiled process groove of the die frame, a gap exists between the profiled process groove and the edge of the profiled bosses of the upper punch and the lower punch, and the gap is less than or equal to the particle size of the used powder.

6. The mold of claim 1, wherein The height H1 of the lower punch profile boss is less than the height H2 of the profiled process groove of the die frame, and the lower punch profile boss axially matches with the profiled process groove to form a profiled cavity, and the height difference between H2 and H1 is the filling height H3.

7. The mold of claim 6, wherein The height H4 of the upper punch profile boss is greater than the height H2 of the profiled process groove of the die frame, and the height difference between H4 and H2 is the material removal height H6, and H6 is greater than or equal to 0.5 mm.

8. The mold of claim 7, wherein, The depth H5 of the profiled recess of the stripper die is greater than the material removal height H6 and the depth H5 is greater than the filling height H3.

9. The mold of claim 1, wherein, The size of the positioning pins of the stripper die matches with the size of the positioning through holes of the die frame.

10. The mold of claim 1, wherein, The number of the positioning pins of the stripper die and the positioning through holes of the die frame is less than or equal to 4.

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