Battery top cover injection mold

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover injection mold which comprises a mold body and a detection assembly, the mold body is provided with an injection molding cavity, an upper insulating part is formed in the injection molding cavity in an injection molding mode, the mold body is further provided with an installation hole, the installation hole is communicated with the injection molding cavity, and part of the detection assembly is arranged in the installation hole. The detection assembly detects the positions of the boss at the lower end of the pole and the top cover by using the eddy current effect, the distance between the boss and the top cover is detected, and the sealing ring is clamped between the boss and the top cover, so that the compression amount of the sealing ring can be detected in real time, poor batch is avoided, the manual detection cost is saved, and the labor-hour cost of an injection molding machine is saved; the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover injection mold. Background Art

[0002] Power batteries generally include a cell, a metal shell for accommodating the cell, and a battery cover for sealing the shell. There are tabs extending from the cell, and the battery cover includes a cover plate and a pole fixed on the cover plate. When assembling the power battery, the cell tabs are first welded to the pole, and then the cell is placed in the shell, and the cover plate and the shell are sealed and welded to assemble into a semi-finished battery. After a series of processes such as liquid injection, formation and capacity, the power battery is obtained. In order to ensure that the power battery has good sealing inside, a sealing ring is usually set on the battery cover to seal the gap between the pole and the cover. When the battery cover is assembled, the sealing ring mainly relies on the connection with the plastic ring after injection molding to seal the pole. The compression amount of the sealing ring in the axial direction of the pole has a great influence on the sealing of the pole, so it is necessary to detect the compression amount of the sealing ring.

[0003] The compression amount of the sealing ring of the battery top cover with injection molding structure can only be confirmed by offline sectioning inspection and measuring the size of the section. If one product is detected as unqualified, it will lead to defective products in batches, thereby increasing production costs. The time required is very long and the results cannot be fed back in time, affecting production efficiency.

[0004] Therefore, a device is urgently needed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a battery top cover injection mold, which can monitor the compression amount of the sealing ring in the top cover assembly in real time, reduce production costs and improve production efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery top cover injection mold is used for injection molding the upper insulating part in the top cover assembly, including:

[0008] A mold body, wherein the mold body is provided with an injection molding cavity, the upper insulating member is formed by injection molding in the injection molding cavity, and the mold body is further provided with a mounting hole, the mounting hole being connected to the injection molding cavity;

[0009] A detection component is configured to detect the distance between the cover plate and the boss of the pole, and the detection component includes an eddy current probe and a sensing component. The eddy current probe is movably inserted in the mounting hole, and the sensing component is fixed to the end of the mounting hole, and one end of the eddy current probe can abut against one end of the sensing component, and the other end of the sensing component is flush with the cavity wall of the injection cavity.

[0010] Preferably, the detection assembly also includes an adjusting nut, an elastic member and a pressure block, the adjusting nut is threaded on the lower end of the eddy current probe, the pressure block is fixed in the mounting hole, and the eddy current probe can be movably inserted in the through hole of the pressure block, the elastic member is sleeved on the eddy current probe, and one end of the elastic member abuts against the adjusting nut, and the other end of the elastic member abuts against the pressure block, and the elastic member is in a compressed state.

[0011] Preferably, the detection component also includes an eddy current sensor and a cable. The eddy current sensor is installed on the outer surface of the mold body. One end of the cable is connected to the output end of the eddy current probe, and the other end is connected to the input end of the eddy current sensor.

[0012] Preferably, the eddy current sensor is connected to an injection molding machine.

[0013] Preferably, the mold body comprises an upper mold plate, a mold cavity and a mold core, the mold cavity is arranged between the upper mold plate and the mold core, the mold cavity and the mold core cooperate to form the injection cavity, and the mounting hole is arranged in the mold cavity.

[0014] Preferably, the upper mold is provided with a hot runner, one end of the hot runner passes through the upper mold, and the other end of the hot runner is connected to the injection cavity.

[0015] Preferably, the mold cavity is provided with a first groove, and the mold core is provided with a second groove, and the first groove and the second groove cooperate to form a placement groove, and the placement groove is used to hold the top cover assembly.

[0016] Preferably, the top cover assembly includes a cover plate, a pole, a sealing ring and an upper insulating member, the cover plate, the pole and the sealing ring are placed in the placement groove, the pole is inserted into the pole hole of the cover plate from bottom to top, and the pole is spaced from the hole wall of the pole hole, the sealing ring is sleeved on the pole, and the sealing ring is clamped between the boss of the pole and the lower surface of the cover plate, the upper insulating member is sleeved on the pole and tightly attached to the upper surface of the cover plate, and the cover plate, the pole, the sealing ring and the groove wall of the first groove cooperate to form the injection molding cavity.

[0017] Preferably, at least a portion of the upper insulating member is inserted into the pole hole and clamped between the pole and the hole wall of the pole hole, and the bottom of the upper insulating member is circumferentially connected to the top of the sealing ring.

[0018] Preferably, the pole comprises a main body and the boss which are connected, the main body is inserted into the pole hole, and the boss is circumferentially connected to the outer wall of the main body.

[0019] Beneficial effect: The battery top cover injection mold provided in this embodiment includes a mold body and a detection component, wherein the mold body is provided with an injection cavity, and the upper insulating part is formed by injection molding in the injection cavity. The mold body is also provided with a mounting hole, which is connected to the injection cavity, and part of the detection component is arranged in the mounting hole. The detection component utilizes the eddy current effect to detect the position of the boss of the pole and the top cover, and detects the distance between the boss and the top cover. Since the sealing ring is clamped between the boss and the top cover, the compression amount of the sealing ring can be detected in real time, thereby avoiding batch defects, saving labor inspection costs, saving injection molding machine labor costs, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a partial structural schematic diagram of the battery top cover injection mold provided by the utility model.

[0021] In the figure:

[0022] 101. Cover plate; 102. Pole; 103. Sealing ring; 104. Upper insulating member; 10. Upper template; 20. Cavity; 30. Core; 11. Eddy current probe; 12. Inductive member; 13. Adjusting nut; 14. Elastic member; 15. Pressing block; 16. Cable. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0027] This embodiment provides a battery top cover injection mold, which can be used to injection mold an upper insulating member in a top cover assembly and detect the compression amount of the sealing ring during the molding process to ensure the sealing of the pole, thereby reducing the production cost of the top cover assembly and improving production efficiency.

[0028] Prior to this, the specific structure of the top cover assembly needs to be described. Specifically, Figure 1 As shown, the top cover assembly includes a cover plate 101, a pole 102, a sealing ring 103 and an upper insulating member 104, wherein the pole 102 is inserted into the pole hole of the cover plate 101 from bottom to top, and the pole 102 is spaced from the hole wall of the pole hole to avoid creepage, further, the sealing ring 103 is sleeved on the pole 102, and the upper insulating member 104 is sleeved on the pole 102 and is close to the upper surface of the cover plate 101. Preferably, the cover plate 101 is made of aluminum.

[0029] Furthermore, the pole 102 includes a connected main body and a boss, the boss is circumferentially connected to the outer wall of the main body, preferably, the boss is connected to the bottom of the main body, thereby fixing the pole 102 to the cover plate 101, wherein the main body can be inserted into the pole hole from bottom to top, and the sealing ring 103 is clamped between the boss of the pole 102 and the lower surface of the cover plate 101, thereby ensuring the sealing of the pole 102.

[0030] Furthermore, at least part of the upper insulating member 104 is inserted into the pole hole and clamped between the pole 102 and the hole wall of the pole hole to further ensure the sealing of the pole 102. It should be noted that during the injection molding process, the bottom of the upper insulating member 104 is circumferentially connected to the top of the sealing ring 103.

[0031] The battery top cover injection mold provided in this embodiment includes a mold body and a detection component, wherein the mold body is used to injection-mold the above-mentioned upper insulating part 104, and the detection component is used to detect the compression amount of the above-mentioned sealing ring 103 during the molding process to ensure the sealing of the pole 102, reduce the production cost of the top cover assembly, and improve production efficiency.

[0032] Specifically, the mold body is provided with an injection cavity, in which the upper insulating member 104 is injection-molded. Preferably, the mold body comprises an upper mold plate 10, a mold cavity 20 and a mold core 30, wherein the mold cavity 20 is provided between the upper mold plate 10 and the mold core 30, and the mold cavity 20 and the mold core 30 cooperate to form the injection cavity.

[0033] Furthermore, the cavity 20 is provided with a first groove, and the core 30 is provided with a second groove. The cavity 20 and the core 30 are buckled together, and the first groove and the second groove cooperate to form a placement groove, which is used to hold the top cover assembly. Specifically, the pole 102 is first inserted into the pole hole of the cover plate 101 from bottom to top, and the pole 102 is spaced from the hole wall of the pole hole, and then the sealing ring 103 is sleeved on the pole 102 and made close to the upper surface of the cover plate 101, and then placed in the placement groove, and at this time, the cover plate 101, the pole 102, the sealing ring 103 and the groove wall of the first groove cooperate to form the above-mentioned injection cavity to form the upper plastic by injection molding.

[0034] Preferably, the upper mold plate 10 is provided with a hot runner, one end of the hot runner passes through the upper mold plate 10, and the other end of the hot runner is connected to the injection cavity, and the fluid glue enters the injection cavity through the hot runner, and after molding, the upper insulating part 104 is formed. Optionally, multiple hot runners are arranged at intervals, and the multiple hot runners are symmetrically arranged to ensure balanced glue feeding in various places in the injection cavity and improve the quality of the upper insulating part 104.

[0035] It should be noted that, based on the eddy current effect, an alternating magnetic field generated by an alternating current of a certain frequency can induce eddy currents in metal objects, and the equivalent resistance and inductance of the hidden metal objects are reflected, thereby changing the size and phase of the detection current, thereby detecting the metal objects. This embodiment uses the eddy current effect to detect the position of the boss and the cover plate 101. The distance between the boss and the cover plate 101 can be obtained by measurement, and the compression amount of the sealing ring 103 can be detected.

[0036] Furthermore, the mold body is also provided with a mounting hole. Specifically, the mounting hole is arranged in the mold cavity 20, and the mounting hole is connected to the injection molding cavity. The detection component includes an eddy current probe 11 and a sensor 12. The eddy current probe 11 is movably inserted in the mounting hole, and the sensor 12 is fixed at the end of the mounting hole. When the compression amount of the sealing ring 103 (the distance between the cover plate 101 and the boss) is detected, one end of the eddy current probe 11 abuts against one end of the sensor 12 to receive the signal detected by the sensor 12. The other end of the sensor 12 is flush with the cavity wall of the injection molding cavity. On the one hand, the mounting hole can be blocked to prevent the fluid glue from leaking into the injection molding cavity during the molding process. On the other hand, after the upper insulating part 104 is molded, the other end of the sensor 12 can be tightly attached to the top of the upper insulating part 104.

[0037] In order to achieve that one end of the eddy current probe 11 can abut against one end of the sensing element 12, the detection assembly provided in this embodiment also includes an adjusting nut 13, an elastic member 14 and a pressing block 15, wherein the adjusting nut 13 is screwed to the lower end of the eddy current probe 11, the pressing block 15 is fixed in the mounting hole, the elastic member 14 is sleeved on the eddy current probe 11, and one end of the elastic member 14 abuts against the adjusting nut 13, and the other end of the elastic member 14 abuts against the pressing block 15, and the elastic member 14 is always in a compressed state, pressing down the adjusting nut 13, thereby pressing down the eddy current probe 11 all the time, ensuring that one end of the eddy current probe 11 can abut against one end of the sensing element 12. It should be noted that the pressing block 15 is provided with a through hole along the axial direction of the eddy current probe 11, and the eddy current probe 11 can be movably inserted into the through hole of the pressing block 15.

[0038] When the elastic member 14 is not elastic enough after long-term use, the position of the adjusting nut 13 can be adjusted and screwed upward to further compress the elastic member 14 to ensure that one end of the eddy current probe 11 abuts against one end of the sensing member 12 .

[0039] Furthermore, the detection component also includes an eddy current sensor and a cable 16, wherein the eddy current sensor is installed on the outer surface of the mold body, one end of the cable 16 is connected to the output end of the eddy current probe 11, and the other end is connected to the input end of the eddy current sensor, so as to transmit the signal detected by the sensing element 12 to the eddy current sensor through the cable 16. Preferably, the cable 16 is arranged between the cavity 20 and the core 30.

[0040] In summary, the battery top cover injection mold provided in this embodiment can monitor the compression amount of the sealing ring 103 in real time to avoid batch defects, thereby saving the detection time of the compression amount of the sealing ring 103, saving manual detection costs, saving injection molding machine labor costs, and improving production efficiency.

[0041] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery top cover injection mold, used for injection molding an upper insulating member (104) in a top cover assembly, characterized in that: include: A mold body, the mold body being provided with an injection molding cavity, the upper insulating member (104) being formed by injection molding in the injection molding cavity, the mold body being further provided with a mounting hole, the mounting hole being connected to the injection molding cavity; A detection component is configured to detect the distance between a cover plate (101) and a boss of a pole (102), and the detection component comprises an eddy current probe (11) and a sensing component (12), wherein the eddy current probe (11) is movably inserted into the mounting hole, and the sensing component (12) is fixed to an end of the mounting hole, and one end of the eddy current probe (11) can abut against one end of the sensing component (12), and the other end of the sensing component (12) is flush with the cavity wall of the injection cavity.

2. The battery top cover injection mold according to claim 1, characterized in that: The detection assembly further comprises an adjusting nut (13), an elastic member (14) and a pressing block (15); the adjusting nut (13) is screwed to the lower end of the eddy current probe (11); the pressing block (15) is fixed in the mounting hole, and the eddy current probe (11) can be movably inserted into the through hole of the pressing block (15); the elastic member (14) is sleeved on the eddy current probe (11), and one end of the elastic member (14) abuts against the adjusting nut (13), and the other end of the elastic member (14) abuts against the pressing block (15); the elastic member (14) is in a compressed state.

3. The battery top cover injection mold according to claim 1, characterized in that: The detection component also includes an eddy current sensor and a cable (16). The eddy current sensor is installed on the outer surface of the mold body. One end of the cable (16) is connected to the output end of the eddy current probe (11), and the other end is connected to the input end of the eddy current sensor.

4. The battery top cover injection mold according to claim 3, characterized in that: The eddy current sensor is connected to the injection molding machine.

5. The battery top cover injection mold according to claim 1, characterized in that: The mold body comprises an upper mold plate (10), a mold cavity (20) and a mold core (30); the mold cavity (20) is arranged between the upper mold plate (10) and the mold core (30); the mold cavity (20) and the mold core (30) cooperate to form the injection cavity; and the mounting hole is arranged in the mold cavity (20).

6. The battery top cover injection mold according to claim 5, characterized in that: The upper mold plate (10) is provided with a hot runner, one end of the hot runner passes through the upper mold plate (10), and the other end of the hot runner is connected to the injection cavity.

7. The battery top cover injection mold according to claim 5, characterized in that: The mold cavity (20) is provided with a first groove, and the mold core (30) is provided with a second groove. The first groove and the second groove cooperate to form a placement groove, and the placement groove is used to hold the top cover assembly.

8. The battery top cover injection mold according to claim 7, characterized in that: The top cover assembly comprises a cover plate (101), a pole (102), a sealing ring (103) and an upper insulating member (104); the cover plate (101), the pole (102) and the sealing ring (103) are placed in the placement groove; the pole (102) is inserted into the pole hole of the cover plate (101) from bottom to top, and the pole (102) is spaced from the hole wall of the pole hole; the sealing ring (103) is sleeved The sealing ring (103) is arranged on the pole (102), and is sandwiched between the boss of the pole (102) and the lower surface of the cover plate (101). The upper insulating member (104) is sleeved on the pole (102) and is tightly attached to the upper surface of the cover plate (101). The cover plate (101), the pole (102), the sealing ring (103) and the groove wall of the first groove cooperate to form the injection molding cavity.

9. The battery top cover injection mold according to claim 8, characterized in that: At least part of the upper insulating member (104) is inserted into the pole hole and clamped between the pole (102) and the hole wall of the pole hole, and the bottom of the upper insulating member (104) is circumferentially connected to the top of the sealing ring (103).

10. The battery top cover injection mold according to claim 8, characterized in that: The pole (102) comprises a connected main body and the boss, the main body is inserted into the pole hole, and the boss is circumferentially connected to the outer wall of the main body.

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