CN210590285U - Battery case hot runner mold structure - Google Patents

Abstract

The utility model provides a hot runner mold structure of a battery case, which is characterized in that a push plate is arranged between an upper template and a lower template, and the push plate is arranged as a support frame which is spliced in a split way so as to push the plate insert, so that the material application of the push plate aiming at the storage battery shell is reduced, meanwhile, the storage battery shell is prevented from being directly jacked by the traditional jacking rod, the technical problem of poor surface finish after the storage battery shell is jacked out is solved, in the step of die assembly and injection molding, the material injection nozzles which are arranged along the center point of the cavity in a central symmetry manner or are directly arranged on the center point of the cavity are injected into the cavity after die assembly, so that the pressure of the raw material injected by the material injection nozzles is kept balanced as much as possible on the two sides of the insert, the insert is prevented from being inclined and deviated as far as possible, and the technical problem that the product quality is influenced by the injection pressure of the raw material in the process of forming the storage battery shell is solved.

Description

Battery case hot runner mold structure

Technical Field

The utility model relates to a battery case injection moulding processing technology field specifically is a battery case hot runner mold structure.

Background

The plastic mold of the existing storage battery shell injection molding is a cold runner injection mold, the cold runner injection mold is about to enter a mold cavity by plastic in a melting state through a sprue bush, a runner and a sprue, no heating element is arranged in the runner, and the cold runner plastic mold has the following technical problems in the process of molding the storage battery shell:

1. after the cold material channel mold is opened, waste material water gap materials are formed at the sprue bush, the runner and the sprue part;

2: the molding cycle is long, the pressure loss is large, and the production efficiency is low;

3. the surface smoothness of the formed product is low, and the wall thickness is not uniform;

4. the mechanical property is lower.

The chinese utility model application number 201810521774.7 discloses a battery jar and battery cover hot runner plastic mould, including the mould main part, the inside of mould main part is equipped with heating system, and heating system installs in the mould main part, is equipped with movable interface in the mould main part, and movable interface passes through screw and mould main part fixed connection. This kind of battery jar and battery cover hot runner plastic mould application be hot runner plastic mould, be equipped with the temperature control case, and the temperature control case possesses high temperature alarming function and automatically regulated function, through the effectual temperature of adjusting among the integral hot runner system of temperature control case, thereby make the solution temperature variation control in the precision range of requirement, can make the inside remaining raw materials of mould can not cool off, avoid carrying out the breakage through crushing apparatus once more, make the production site can not produce the dust, do not have occupational injury to the staff, do not have environmental pollution, thereby reach the environmental protection effect.

Although the above patent realizes the hot runner injection molding of the accumulator shell, it has the following technical problems:

1. after the storage battery shell is formed, in the demolding process, the ejector rod directly ejects out the storage battery shell, so that concave blocks appear on the storage battery shell, and the surface finish degree is influenced;

2. the push plate for ejecting the storage battery shell is high in manufacturing cost.

SUMMERY OF THE UTILITY MODEL

To above problem, the utility model provides a battery case hot runner mold structure, it sets up the push pedal through between cope match-plate pattern and the lower bolster, and sets up the push pedal into the carriage of components of a whole that can function independently scarf joint and then push pedal mold insert, makes the material application to the push pedal of battery case reduce, avoids the direct top of traditional ejector pin to locate battery case simultaneously, has solved the poor technical problem of the ejecting back surface finish of battery case.

In order to achieve the above object, the utility model provides a following technical scheme:

a battery case hot runner mold structure comprising:

the device comprises an upper die assembly, a lower die assembly and a plurality of cooling channels, wherein the upper die assembly sequentially comprises a heat insulation plate, an upper die fixing plate, a hot runner plate and an upper die plate which are mutually overlapped and connected from top to bottom along the vertical direction, an upper die cover plate and a cavity plate are embedded in the upper die plate, the upper die cover plate covers the cavity plate, the cavity plate is provided with a plurality of cavities for injection molding of the storage battery shells and the cooling runners which are arranged around the cavities and used for cooling the storage battery shells formed in the cavities, and the upper die assembly is internally provided with a hot runner group which is communicated with the cavities and used for injecting thermoplastic resin into the cavities; and

the lower mould assembly, the lower mould assembly includes mutual superimposed push pedal, lower bolster and lower mould fixed plate from last to down in proper order along vertical direction, the push pedal promotes the setting along vertical direction, the vertical subunit that goes into that is provided with on the lower bolster should go into the subunit and pierce through the push pedal with the cavity one-to-one alternates the cooperation and forms the one-tenth die cavity that becomes the profile modeling setting with the battery shell, the lower mould fixed plate with the setting is connected to the lower bolster, be provided with the promotion in the lower mould assembly the propelling movement subassembly of push pedal.

As an improvement, the side wall of the chamber in the width direction is in an arc shape and protrudes outwards.

As an improvement, the hot runner set includes:

a feed nozzle;

the material inlet nozzle is communicated with the material inlet channel, and the central point of the main flow channel is communicated with the material inlet nozzle;

the material injection nozzle groups are arranged on the end face of the other side of the flow distribution plate relative to the material inlet nozzle, are in one-to-one correspondence with the cavity and comprise material injection nozzles in one-to-one correspondence communication with the branch flow passages, and discharge ports of the material injection nozzles are opposite to the cavity in communication; and

the heating element is arranged around the main flow channel and the branch flow channel.

As an improvement, the feeding nozzle is arranged at the central point of the splitter plate, and the main runner and the branch runners are arranged at two sides of the splitter plate in a central symmetry manner along the central point of the splitter plate.

As an improvement, the material injection nozzles in each group of material injection nozzle groups are arranged in central symmetry with the center points of the corresponding chambers, the material injection nozzles are arranged above the corresponding chambers in opposite angles, and the material injection nozzles are respectively and correspondingly arranged on the center lines of the width directions of the second group and the fifth group of single cells arranged in the length direction of the formed storage battery shell.

As an improvement, the material injection nozzles in each material injection nozzle group are all arranged on the center line points of the corresponding chambers.

As an improvement, the push plate comprises:

the middle part of the support frame is provided with an inlaying groove which is arranged to cover the cavity; and

and the push plate insert is embedded in the embedding groove and is provided with a notch through which the insert subunit penetrates.

As an improvement, the insert units comprise a plurality of inserts which are equidistantly arranged along the length direction of the cavity, the inserts are arranged in one-to-one correspondence with the single lattices in the storage battery shell, and the parts of the inserts, which are positioned at two sides of the length direction of the cavity, corresponding to the side wall of the cavity in the width direction are both arranged in an arc shape and protrude outwards.

As an improvement, the push assembly comprises:

the lower end part of the first guide rod is connected and arranged on the lower template, the upper end part of the first guide rod penetrates through the push plate, and the push plate is arranged along the first guide rod in a sliding manner;

the upper end part of the second guide rod is connected with the push plate, and the lower end part of the second guide rod is arranged on the lower template in a sliding manner; and

the upper end part of the push rod is connected with the push plate, the lower end part of the push rod is arranged on the lower template in a sliding mode, and the lower end part of the push rod is provided with a cylindrical limiting part which is clamped with the lower template and used for limiting the push plate.

The utility model discloses plastic mould structure's beneficial effect lies in:

(1) the utility model discloses a utilize to set up the push pedal on the lower bolster, utilize the ejector pin of injection molding machine to promote the push pedal, through the block at push pedal and battery shell opening border, promote the battery shell to break away from going into the son, realize the drawing of patterns of battery shell and handle, avoided the ejector pin to directly push out the shell of electric power storage, influence the surface finish;

(2) the utility model discloses a split type setting is carried out to the push pedal, sets up the push pedal as carriage and push pedal mold insert respectively, and the push pedal mold insert is used for ejecting to the battery shell, adopts the material that each item mechanical properties is better to make, and the carriage is used for inlaying the grafting push pedal mold insert, adopts the more general material of mechanical properties to make, has reduced the manufacturing cost of push pedal;

(3) the utility model discloses a lateral wall to die cavity width direction place carries out the protruding processing of arc with the income son that is located die cavity length both sides, makes fashioned battery case's length direction's lateral wall after the cooling shrinkage, offsets the cooling shrinkage through protruding surplus, makes the lateral wall at battery case width direction place not inwards shrink, improves the shaping quality of battery case, improves product size precision.

To sum up, the utility model discloses it is strong, the forming method of battery is optimized more to have plastic mould structural stability, has realized that the mechanical properties and the size precision of fashioned battery shell are high, and the surface is bright and clean.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic top view of the present invention;

FIG. 3 is a schematic view of a hot runner assembly of the present invention;

fig. 4 is a schematic longitudinal sectional view of the hot runner assembly of the present invention;

fig. 5 is a schematic cross-sectional view of the hot runner assembly of the present invention;

FIG. 6 is a schematic view of the lower template in a three-dimensional structure;

FIG. 7 is a side view of the lower template of the present invention;

FIG. 8 is a schematic diagram of a side view structure of the lower template of the present invention;

fig. 9 is a schematic sectional view of the chamber according to the present invention;

FIG. 10 is a schematic sectional view of the chamber according to the present invention;

fig. 11 is a schematic perspective view of a second embodiment of the present invention;

fig. 12 is a schematic structural view of the third longitudinal section of the embodiment of the present invention;

fig. 13 is a schematic structural view of three transverse sectional views in the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The first embodiment is as follows:

as shown in fig. 1 to 6, 8 and 9, a battery case hot runner mold structure includes:

the mold comprises an upper mold assembly 10, wherein the upper mold assembly 10 sequentially comprises a heat insulation plate 1, an upper mold fixing plate 2, a hot runner plate 3 and an upper mold plate 4 which are mutually overlapped and connected from top to bottom along the vertical direction, an upper mold cover plate 43 and a cavity plate 41 are embedded in the upper mold plate 4, the upper mold cover plate 43 covers the cavity plate 41, a plurality of cavities 411 for injection molding of the storage battery shells 40 and cooling runners which are arranged around the cavities 411 and cool the storage battery shells 40 formed in the cavities 411 are arranged on the cavity plate 41, and hot runner groups 5 which are communicated with the cavities 411 and inject thermoplastic resin into the cavities 411 are arranged in the upper mold assembly 10; and

lower mould assembly 20, lower mould assembly 20 includes mutual superimposed push pedal 6, lower bolster 7 and lower mould fixed plate 8 from last to down in proper order along vertical direction, push pedal 6 promotes the setting along vertical direction, the vertical subunit 71 of going into that is provided with on the lower bolster 7, should go into subunit 71 and pierce through push pedal 6 with cavity 411 one-to-one alternates the cooperation and forms the shaping chamber that becomes the profile modeling setting with battery shell 40, lower mould fixed plate 8 with the lower bolster 7 is connected the setting, be provided with the promotion in the lower mould assembly 20 the propelling movement subassembly 9 of push pedal 6.

As shown in fig. 3 to 5, the hot runner set 5 includes:

a feed nozzle 51;

the material distribution plate 52 is provided with a main runner 521 and a plurality of branch runners 522 communicated with the main runner 521, and the central point of the main runner 521 is communicated with the material inlet nozzle 51;

the material injection nozzle groups 53 are arranged on the end face of the other side of the flow distribution plate 52 relative to the material inlet nozzle 51, are in one-to-one correspondence with the cavity 411 and comprise material injection nozzles 531 communicated with the branch flow passages 522 in one-to-one correspondence, and discharge ports of the material injection nozzles 531 are opposite to the cavity 411 in a communication manner; and

a heating element 54, wherein the heating element 54 is disposed around the main channel 521 and the branch channel 522.

Further, the feeding nozzle 51 is disposed at a central point of the dividing plate 52, and the main flow channel 521 and the branch flow channels 522 are disposed at two sides of the dividing plate 52 along the central point of the dividing plate 52 in a central symmetry manner.

Furthermore, the material injection nozzles 531 in each material injection nozzle group 53 are arranged in a central symmetry manner along the center points of the corresponding cavities 411, the material injection nozzles 531 are arranged above the corresponding cavities 411 in a diagonal manner, and the material injection nozzles 531 are respectively arranged on the center lines of the second group and the fifth group of the unit cells 401 arranged in the length direction of the formed battery shell 40 in the width direction.

It should be noted that, more traditional hot runner plastic mould, the utility model discloses with sprue 521 and the feeding mouth 51 intercommunication that is located flow distribution plate 52 central point and puts the department, and set up sprue 521 on flow distribution plate 52, sprue 522 and notes material mouth 531 all become central symmetry along flow distribution plate 52's center, guarantee the flow of the raw materials of every notes material mouth 531 of flow direction, pressure all is the same, and simultaneously, realize as far as possible that notes material mouth 531 sets up on cavity 411 symmetrically, make notes material mouth 531 in the smooth and easy feeding to cavity 411, can ensure the pressure of the income sub 711 both sides raw materials that sets up in cavity 411 as far as possible balanced, the income sub can not take place the slope as far as possible.

Furthermore, it is preferable that each group of the chambers 411 is filled with 2 filling nozzles 531, which are distributed on opposite corners of the chambers 411, and 2 filling nozzles 531 are disposed in the region where the second and fifth groups of cells 401 are arranged in the length direction of the battery case, so that the filling nozzles 531 are disposed on the center line of the chamber 411 in the width direction, which may result in insufficient material flow on both sides of the chamber 411 in the length direction, if the filling nozzles 531 are disposed on the center line of the chamber 411 in the width direction, like the first and second embodiments, and the opposite corners are disposed, so that the filling nozzles 531 may be compensated with each other to fill the chambers 411 in the respective portions of the chamber 411.

It is further described that the junction box and the splitter plate 52 are fixed by cup head screws, the junction box is connected with the temperature control box and the hot runner plate heating device by wiring, the hot runner plate is additionally provided with the hot runner plate, the injection nozzle 531 is internally provided with a valve needle which is fixed on a valve needle hanger on a piston rod inside a valve needle sleeve, meanwhile, the valve needle sleeve is fixed on the upper die fixing plate 1 by screw connection, the periphery of the valve needle sleeve is provided with air holes which are connected with the air holes on the upper die fixing plate 1, further, the air holes on the upper die fixing plate are tightly attached with the air holes of the electromagnetic valve fixed on the branch runner 522 by a high temperature resistant sealing ring, the air holes on the other side of the electromagnetic valve are connected with an air pipe in a factory building by the air pipe, the electromagnetic valve is fixed on the splitter plate 52 by screws, the electromagnetic valve is connected on a time schedule controller on the, the electromagnetic valve can control the opening and closing time of each valve needle by receiving signals transmitted by the timing controller.

The mold structure in this embodiment is applied to the production of a 100AH battery case, and during the production process, the raw material injection pressure is preferably 120Mpa, the raw material stage injection time is preferably 9s, the pressure maintaining pressure of the chamber 411 is preferably 90Mpa, the pressure maintaining time of the chamber 411 is preferably 4s, and the cooling time of the chamber 411 is preferably 32 s.

As a preferred embodiment, the push plate 6 comprises:

a support frame 61, wherein an insert groove 611 is formed in the middle of the support frame 61, and the insert groove 611 is disposed to cover the chamber 411; and

and a push plate insert 62, wherein the push plate insert 62 is inserted into the insertion groove 611, and a notch 621 through which the insert subunit 71 penetrates is formed on the push plate insert 62.

It should be noted that the push plate 6 is separately arranged, the push plate 6 is respectively arranged as the support frame 61 and the push plate insert 62, and the push plate insert 62 is used for ejecting the storage battery shell 40, and the mechanical properties, the surface processing roughness and the finish degree of the push plate insert are superior to those of the support frame 61.

As shown in fig. 7 and 8, as a preferred embodiment, the pushing assembly 9 includes:

the lower end part of the first guide rod 91 is connected to the lower template 7, the upper end part of the first guide rod 91 penetrates through the push plate 6, and the push plate 6 is arranged along the first guide rod 91 in a sliding manner;

the upper end part of the second guide rod 92 is connected with the push plate 6, and the lower end part of the second guide rod 92 is arranged on the lower template 7 in a sliding manner; and

and the upper end part of the push rod 93 is connected with the push plate 6, the lower end part of the push rod 93 is arranged on the lower template 7 in a sliding manner, and the lower end part of the push rod 93 is provided with a cylindrical limiting part 94 which is clamped with the lower template 7 and used for limiting the push plate 6.

It should be noted that, the utility model discloses more traditional hot runner plastic mould structure drives the outside propelling movement of push pedal 6 through ejector pin cooperation push rod 93 of injection molding machine, breaks away from the output with the inside propelling movement of battery shell of back-off on income son 711, has avoided the injection molding machine directly to act on battery shell through the ejector pin, and the ejecting pit of battery shell that will break away from destroys the bright and clean on battery shell surface.

Further, the lower die plate 7 is provided with a step which is correspondingly matched with the limiting portion 94, and the pushing distance of the push plate 7 is limited by the clamping of the step and the limiting portion 94.

As shown in fig. 9 and 10, as a preferred embodiment, the side wall of the chamber 411 in the width direction is curved and protrudes outward.

Further, the insert unit 71 includes a plurality of inserts 711 equidistantly arranged along the length direction of the cavity 411, the inserts 711 and the cells 401 in the battery case 40 are arranged in a one-to-one correspondence, and the portions of the side walls of the inserts 711 on both sides of the length direction of the cavity 411, corresponding to the width direction of the cavity 411, are both arranged in an arc shape and protrude outwards.

It should be noted that the battery shell can take place the cooling shrinkage after injection moulding, and the lateral wall at battery shell width direction place is very easily owing to do not have the additional strengthening of baffle 402, and is inwards sunken shrink after the cooling, the utility model discloses a set up curved outside protruding on cavity 411 and the income son 711 that corresponds, set up the deformation allowance in advance, utilize the deformation allowance to offset the deformation volume that the cooling shrinkage brought, make the lateral wall at battery shell width direction place not inwards sunken deformation.

Example two:

fig. 11 is a schematic structural view of a second embodiment of the hot runner plastic mold structure for a battery case according to the present invention; as shown in fig. 11, in which the same or corresponding components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, only the points different from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment shown in fig. 1 in that:

as shown in fig. 11 to 13, the hot runner mold structure for battery cases of the present embodiment is used for injection molding to produce 12AH battery cases, and since the 12AH battery cases are small in size, it differs from the first embodiment in that the number of the injection nozzles 531 in each set is preferably 1, and the injection nozzles 531 are disposed at the center line points of the corresponding cavities 411.

It should be noted that the plastic mold structure of the hot runner for battery case in this embodiment is a mold with four cavities, and 4 battery cases 50 can be produced by injection molding through four cavities 411 at a time during the production process, so the volume of the mold structure is similar to the volume of the mold structure capable of producing only 1 100AH battery cases at a time.

In the injection molding production process for producing the 12AH battery shell in the embodiment, the raw material injection pressure is preferably 90MPa, the raw material stage injection time is preferably 4s, the pressure maintaining pressure of the chamber 411 is preferably 100MPa, the pressure maintaining time of the chamber 411 is preferably 2s, and the cooling time of the chamber 411 is preferably 15 s.

The working process is as follows:

utilizing MOLDFLOW mold flow analysis software to carry out simulation analysis on the shape and the injection molding conditions of the storage battery shell, designing an optimal plastic mold structure of a hot runner of the storage battery shell, preparing raw materials, heating, drying and evaporating water for plastic particles, wherein the drying temperature is 80-90 ℃, the drying time is 2 hours, the dried plastic particles are added into a charging barrel of an injection molding machine through a hopper, the granular raw materials are changed into a molten state through heating and rotation of a screw rod of the injection molding machine, the temperature of the molten plastic is 220 ℃, an upper mold assembly 10 and a lower mold assembly 20 are matched through guiding and positioning of a tiger mouth 62 and a convex 42, after the mold is matched, the injection molding machine injects the hot-melted raw materials into the hot runner group 5 through a feeding nozzle 51 plate, and then injects the hot-melted raw materials into a cavity 411 after the mold is matched through a material injection nozzle 531 symmetrically arranged along the center of the, the injection pressure is 90-120Mpa, the sectional injection time is 4-8s, the pressure maintaining pressure is 90-100Mpa, the pressure maintaining time is 2-4s, stopping feeding the glue after the pressure maintaining of the raw material injection is finished, introducing cooling liquid through the cooling flow channel to cool the raw material in the cavity 411 for 15-32s, opening the upper die assembly 10 and the lower die assembly 20 after the cooling is finished, acting the ejector rod of the injection molding machine on the push rod 93 connected with the push plate 6, pushing the push plate 6 out along the first guide rod 91 and the second guide rod 92, the accumulator shell which is reversely buckled on the insert 711 is pushed outwards by the push plate 6 to be separated and output, the formed accumulator shell is placed for 12 hours to be fully cooled, the size of the storage battery is measured, and meanwhile, the deformation caused by shrinkage in the length direction and the width direction is detected, so that the size is ensured to meet the tolerance range of production requirements.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A battery case hot runner mold structure, comprising:

the mold comprises an upper mold assembly (10), wherein the upper mold assembly (10) sequentially comprises a heat insulation plate (1), an upper mold fixing plate (2), a hot runner plate (3) and an upper mold plate (4) which are mutually overlapped and connected from top to bottom along the vertical direction, an upper mold cover plate (43) and a cavity plate (41) are embedded in the upper mold plate (4), the upper mold cover plate (43) covers the cavity plate (41), a plurality of cavities (411) for injection molding of a storage battery shell (40) and a cooling runner which is arranged around the cavities (411) and cools the storage battery shell (40) formed in the cavities (411) are arranged on the cavity plate (41), and a hot runner group (5) which is communicated with the cavities (411) and injects thermoplastic glue into the cavities (411) is arranged in the upper mold assembly (10); and

lower mould assembly (20), lower mould assembly (20) are from last to including mutual superimposed push pedal (6), lower bolster (7) and lower mould fixed plate (8) down in proper order along vertical direction, push pedal (6) promote the setting along vertical direction, the vertical subunit (71) of going into that are provided with on lower bolster (7), should go into subunit (71) and pierce through push pedal (6) with cavity (411) one-to-one alternates the cooperation and forms the shaping chamber that becomes the profile modeling setting with battery case (40), lower mould fixed plate (8) with lower bolster (7) are connected and are set up, be provided with the promotion in lower mould assembly (20) propelling movement subassembly (9) of push pedal (6).

2. The battery case hot runner mold structure according to claim 1, wherein the side wall of the cavity (411) in the width direction is convexly curved outward.

3. The hot-runner mold structure for battery cases, as set forth in claim 1, characterized in that said hot-runner group (5) comprises:

a feed nozzle (51);

the material feeding device comprises a flow distribution plate (52), wherein a main flow channel (521) and a plurality of branch flow channels (522) communicated with the main flow channel (521) are arranged in the flow distribution plate (52), and the center point of the main flow channel (521) is communicated with the material feeding nozzle (51);

the material injection nozzle groups (53) are arranged on the end face of the other side of the flow distribution plate (52) relative to the feeding nozzle (51), are in one-to-one correspondence with the cavity (411), comprise material injection nozzles (531) in one-to-one correspondence with the branch flow passages (522), and are communicated with the cavity (411) through discharge holes of the material injection nozzles (531); and

a heating element (54), wherein the heating element (54) is arranged around the main flow channel (521) and the branch flow channel (522).

4. The battery case hot runner mold structure according to claim 3, wherein the feeding nozzle (51) is disposed at a central point of the splitter plate (52), and the main runner (521) and the branch runners (522) are disposed on two sides of the splitter plate (52) symmetrically along the central point of the splitter plate (52).

5. The hot runner mold structure for battery cases as set forth in claim 3, wherein said injection nozzles (531) of each injection nozzle group (53) are arranged in central symmetry with each other along the center point of the corresponding cavity (411), the injection nozzles (531) are arranged diagonally above the corresponding cavity (411), and the injection nozzles (531) are respectively arranged on the middle lines of the width directions of the second and fifth groups of cells (401) arranged in the length direction of the molded battery case (40).

6. A battery case hot runner mold structure as claimed in claim 3 wherein said injection nozzles (531) in each group of injection nozzle groups (53) are located at the midline point of the corresponding cavity (411).

7. The hot runner mold structure for battery cases of claim 1 wherein said push plate (6) comprises:

a support frame (61), wherein an embedding groove (611) is arranged in the middle of the support frame (61), and the embedding groove (611) is arranged to cover the cavity (411); and

the push plate insert (62), the push plate insert (62) is inlayed and arranged in the inlaying groove (611), and a notch (621) for the insert subunit (71) to penetrate is formed in the push plate insert (62).

8. The hot runner mold structure for battery cases as claimed in claim 1, wherein said insert unit (71) comprises a plurality of inserts (711) arranged at equal intervals along the length direction of said cavity (411), said inserts (711) are arranged in one-to-one correspondence with the cells (401) in said battery case (40), and the portions of the side walls of said inserts (711) located at both sides of the length direction of said cavity (411) corresponding to the width direction of said cavity (411) are arranged in an arc shape and protrude outwards.

9. The hot-runner mold structure for battery cases, as set forth in claim 1, characterized in that said pushing assembly (9) comprises:

the lower end part of the first guide rod (91) is connected to the lower template (7), the upper end part of the first guide rod (91) penetrates through the push plate (6), and the push plate (6) is arranged along the first guide rod (91) in a sliding mode;

the upper end part of the second guide rod (92) is connected with the push plate (6), and the lower end part of the second guide rod (92) is arranged on the lower template (7) in a sliding manner; and

the upper end part of the push rod (93) is connected with the push plate (6), the lower end part of the push rod (93) is arranged on the lower template (7) in a sliding mode, and the lower end part of the push rod is provided with a cylindrical limiting part (94) which is clamped with the lower template (7) and limits the push plate (6).

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