Charger

Abstract

The utility model discloses a charger, which relates to the technical field of charging and comprises a shell, a circuit board accommodated in the shell and a terminal assembly connected to the circuit board. Wherein the shell comprises an upper shell body and a lower shell body, the upper shell body is fixedly connected with the lower shell body, and a cavity is formed in the upper shell body and the lower shell body; the circuit board is accommodated in the cavity and is fixed with the shell; the terminal assembly comprises a metal insertion piece, a wire fixed to the metal insertion piece and a wire holder connected to the shell, one end of the wire is welded to the metal insertion piece, and the other end of the wire is electrically connected with the circuit board; the wire holder, the metal insert and the wire are integrally injection-molded, and one end of the wire connected with the metal insert is embedded into the wire holder. The connection stability between the metal insertion piece and the wire is improved, the risk that the wire falls off due to falling or vibration is reduced, and the welding position where the wire is connected with the metal insertion piece is sealed in the wire holder, so that the problem of short circuit or poor conductivity caused by invasion of moisture and dust is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to charging technology field, especially a kind of charger. BACKGROUND

[0002] Common charger for charging battery pack of power tool usually includes terminal block, and terminal block is embedded with terminal for electrical connection with battery pack. These terminals are connected with wire by hook welding or male-female interface.

[0003] However, in multi-port charger that can charge multiple above-mentioned battery packs at the same time, when hook welding is used to connect wire with terminal, firstly, due to large weight of battery pack carried by multi-port charger, when falling occurs, charger will be subjected to large impact, and due to poor stability of hook welding, if there is false welding or missing welding, wire will fall off from terminal, and charger will be damaged. Secondly, in terms of waterproof and dustproof, tin welding exposed outside is prone to water, which will cause corrosion and reduce conductivity of tin welding. On the other hand, if solid or dust, especially metal dust, enters, it may cause terminal short circuit and other malfunctions, and damage charger. SUMMARY

[0004] The utility model discloses a kind of chargers, to solve the technical problem that welding between wire and terminal is easily damaged.

[0005] To achieve the above object, the charger provided by the utility model, including shell, circuit board received in the shell and terminal assembly connected to the circuit board;It is characterized by: the shell includes upper shell and lower shell, the upper shell is fixedly connected with the lower shell, and the inside of the upper shell and the lower shell forms a cavity;The circuit board is contained in the cavity, and is fixed with the shell;

[0006] The terminal assembly includes metal tab, wire fixed to the metal tab and terminal block connected to the shell, one end of the wire is welded with the metal tab, and the other end of the wire is electrically connected with the circuit board;

[0007] Among them, the terminal block, the metal tab and the wire are integrally injection molded, and one end of the wire connected with the metal tab is embedded in the terminal block.

[0008] In an embodiment, the length of the wire embedded in the terminal block is not less than 1 centimeter and not more than 3 centimeters.

[0009] In an embodiment, the metal tab includes head and tail, the head is used for electrical connection with battery pack, and the tail is welded with the wire.

[0010] The wire is welded with one end of the terminal tail and embedded in the terminal seat, and integrally injection molded with the terminal seat.

[0011] In an embodiment, the terminal tail is provided with at least one through hole; and / or,

[0012] The terminal tail is provided with an extension part on the side away from the upper shell.

[0013] In an embodiment, the welding between the wire and the metal sheet is impact welding.

[0014] In an embodiment, the lower shell is provided with a limiting groove, which is arranged on the inner surface of the lower shell.

[0015] The terminal seat is provided with a clamping part on the end away from the metal sheet.

[0016] The limiting groove and the clamping part cooperate to fix the terminal seat in the shell; when the upper shell and the lower shell are fixedly connected, the terminal seat is located between the upper shell and the lower shell.

[0017] In an embodiment, the clamping part is disc-shaped; the limiting groove includes a bottom groove and two side grooves, one end of the side groove is located at the end of the lower shell close to the upper shell, and the other end of the side groove is connected to the bottom groove.

[0018] The longitudinal height of the side groove is equivalent to half of the longitudinal height of the clamping part.

[0019] In an embodiment, the outer surface of the shell is provided with a containing groove, the two side walls of the containing groove are provided with guide grooves, the guide grooves are used to guide the engagement of the battery pack and the terminal assembly, and fix the battery pack to the shell.

[0020] The terminal seat is arranged on the groove bottom of the containing groove.

[0021] In an embodiment, the guide grooves are arranged on the outer surface of the upper shell.

[0022] In an embodiment, the charger further comprises:

[0023] A plurality of terminal assemblies are distributed on the two sides of the outer surface of the shell.

[0024] This invention improves the stability of the connection between the terminal block, metal insert, and wire by integrally injection molding the terminal block, metal insert, and wire. This avoids the potential for weak connections that can occur with welding, especially when the charger needs to support the weight of multiple battery packs, and reduces the risk of wire detachment due to drops or vibrations. The integrally injection-molded terminal assembly better encloses the welded joint between the wire and the metal insert within the terminal block, preventing short circuits or poor conductivity caused by moisture and dust intrusion. Furthermore, the manufacturing process simplifies the manual steps of hook welding the wire and metal insert, improving production efficiency and saving labor costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A cross-sectional structural schematic diagram of an embodiment of the charger provided by this utility model;

[0027] Figure 2 A schematic diagram of the overall structure of an embodiment of the terminal assembly and connector of the charger provided by this utility model;

[0028] Figure 3 A schematic diagram of the overall structure of an embodiment of the lower housing of the charger provided by this utility model;

[0029] Figure 4 A schematic diagram of the overall structure of a circuit board of a charger provided by this utility model;

[0030] Figure 5 A schematic diagram of the overall structure of an embodiment of the terminal assembly of the charger provided by this utility model;

[0031] Figure 6 This is a schematic diagram of the overall structure of an embodiment of the charger provided by this utility model.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative efforts belong to the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0035] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the ordinary skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] When charging the battery pack of the electric tool, the commonly used charger is usually provided with a terminal seat, and the terminal seat is embedded with terminals for electrically connecting with the battery pack. These terminals are usually connected with the wires of the charger by welding or plug connection.

[0037] However, when designing a multi-port charger for charging multiple battery packs at the same time, if the welding method is used to connect the wires to the terminals, first of all, since the multi-port charger needs to support the weight of multiple battery packs, it will be subjected to a large impact force when falling, and because the stability of the welding connection is insufficient, if the welding is poor or not firm, the wires may fall off the terminals, causing damage to the charger. Secondly, in terms of waterproof and dustproof, since the welding points are exposed, they are easily affected by moisture, and the welding points will be corroded, thereby causing the conductivity of the welding points to decrease; at the same time, if solid particles or dust, especially metal particles, enter, it may cause the terminals to short circuit, further damaging the charger.

[0038] The utility model provides a kind of charger.

[0039] Please refer to Figures 1 to 4 In an embodiment of the present application, the charger comprises a housing 100, a circuit board 200 accommodated in the housing 100, and a terminal assembly 300 connected with the circuit board 100. The housing 100 comprises an upper housing 110 and a lower housing 120 fixedly connected with the upper housing 110; the interiors of the upper housing 110 and the lower housing 120 form a cavity for accommodating the circuit board 200, and the circuit board 200 is fixed on the inner surface of the housing 100. The terminal assembly 300 comprises a metal tab 310, a wire 320 fixed to the metal tab 310, and a terminal seat 400 connected with the housing 100. One end of the wire 320 is welded with the metal tab 310, and the other end is electrically connected with the circuit board 200. It should be noted that the terminal seat 400 is an injection molding part, which can be connected with the housing by sliding up and down. In addition, the terminal seat 400, the metal tab 310 and the wire 320 are integrally injection molded, and one end of the wire 320 connected with the metal tab 310 is embedded in the interior of the terminal seat 400 during the process of integrally injection molding.

[0040] In the embodiment, the housing 100 is generally cuboid, the lower housing 120 comprises a lower housing sidewall 121 and a housing bottom wall 122 connected with one end of the lower housing sidewall 121, and the upper housing 110 comprises an upper housing sidewall 111 and a housing top wall 112 connected with one end of the upper housing sidewall 111. The housing bottom wall 122 is provided with a support column 130 protruding towards the cavity, and a screw groove 131 is formed in the end of the support column 130 away from the housing bottom wall 122; the circuit board 200 is provided with a first screw hole 210, and the position of the first screw hole 210 corresponds to the screw groove 131. When connecting the circuit board 200 and the housing 100, a first screw is screwed into the first screw hole 210 and the screw groove 131 to fasten the circuit board 200 and the housing 100.

[0041] Further, the support column 130 is arranged at the position of the housing bottom wall 122 adjacent to the lower housing sidewall 121, and simultaneously connects the housing bottom wall 122 and the lower housing sidewall 121, so as to improve the stability of the connection between the support column 130 and the housing 100, and further ensure the stability of the circuit board 200 fixed on the support column 130. It should be noted that the lower housing sidewall 121, the housing bottom wall 122 and the support column 130 are integrally formed, which can further ensure the stability of the circuit board 200 fixed on the support column 130.

[0042] Optionally, the fixed connection between the upper housing 110 and the lower housing 120 is buckle connection and / or screw connection.

[0043] In an alternative embodiment, the lower shell 120 is provided with a second screw hole 140 at one end close to the upper shell 110, and the upper shell 110 is provided with a corresponding second screw hole 140 at one end close to the lower shell 120. When the upper shell 110 and the lower shell 120 are connected, the second screw is passed through the second screw holes 140 of the upper shell 110 and the lower shell 120 to fasten the upper shell 110 and the lower shell 120.

[0044] In another alternative embodiment, the shell 100 is provided with a buckle structure, which includes an outer buckle provided on the lower shell 120 and an inner buckle provided on the upper shell 110 for cooperating with the outer buckle to connect the upper shell 110 and the lower shell 120. Further, the outer buckle is integrally formed with the lower shell 120, and the inner buckle is integrally formed with the upper shell 110 to improve the connection strength between the buckle structure and the shell 100, thereby reducing the risk of the upper shell 110 and the lower shell 120 being separated due to the buckle structure being detached from the shell 100 when the charger falls.

[0045] It should be noted that the diameters of the first screw hole 210 and the second screw hole 140 can be consistent or inconsistent, and the diameters of the first screw and the second screw can be consistent or inconsistent.

[0046] Optionally, the length of the wire 320 embedded in the terminal seat 400 is not less than 1 cm and not more than 3 cm. That is, the length of the wire 320 embedded in the terminal seat 400 is at least 1 cm to ensure that the portion of the wire 320 welded to the metal tab 310 is completely embedded in the terminal seat 400, on the one hand to ensure the stability of the connection between the wire 320, the metal tab 310 and the terminal seat 400, and on the other hand to avoid the influence of moisture or dust on the conductivity of the welded portion of the wire 320 and the metal tab 310. The length of the wire 320 embedded in the terminal seat 400 is not more than 3 cm to avoid the length of the wire 320 not embedded in the terminal seat 400 being insufficient to connect the wire 320 to the above-mentioned circuit board 200. Therefore, by embedding the wire 320 in the terminal seat 400 for a certain length, the wire 320 can be effectively prevented from falling off or loosening due to external force during use of the charger, and the length of 1 to 3 cm can provide sufficient fixing force without excessively limiting the freedom of the wire 320.

[0047] In the embodiment, the welding between the wire 320 and the metal tab 310 is a butt welding. It can be understood that the butt welding is to melt and fuse the metal surface by high temperature and high pressure, and the connection strength formed by the butt welding is higher than that of the traditional soldering, which can withstand greater tension and shear force. In the case that the charger needs to support the weight of multiple battery packs, the wire 320 is prevented from falling off due to external force such as falling, thereby enhancing the mechanical strength of the overall structure of the terminal assembly 300, thereby prolonging the service life of the charger. In addition, since the operability of the butt welding is higher, the speed of connecting the wire 320 and the metal tab 310 by the butt welding process is faster during the production and manufacturing process, thereby improving the production efficiency.

[0048] Optionally, the above-mentioned wire holder 400 is embedded with a plurality of metal tabs 310, and the number of metal tabs 310 and the distance between adjacent two metal tabs 310 can be selected according to the actual use. Specifically, the number of metal tabs 310 embedded in the wire holder 400 can be determined according to the number of slots used for the male-female connection with the metal tab 310 of the battery pack and integrally injection molded with the wire holder 400. In addition, the distance between adjacent two metal tabs 310 can be determined according to the distance between adjacent slots used for the male-female connection with the metal tab 310 of the battery pack.

[0049] Please refer to Figure 5 In the embodiment, the metal tab 310 includes a head 311 and a tail 312. The head 311 is used for electrical connection with the battery pack, and the tail 312 is welded with the wire 320. It should be noted that the end of the wire 320 welded with the tail 312 and the tail 312 embedded in the wire holder 400 are integrally injection molded with the wire holder 400. It can be understood that the above-mentioned terminal and the corresponding slot of the battery pack are inserted in male-female mode to achieve the electrical connection between the above-mentioned charger and the battery pack.

[0050] Optionally, the tail 312 of the metal tab 310 is provided with at least one through hole 313, so that the injection material can pass through the metal tab 310 during the process of embedding the metal tab 310 in the wire holder 400 and integrally injection molding with the wire holder 400. In addition, an extension 314 can be provided on the tail 312 away from the upper shell 110, so that the wire holder 400 can extend away from the upper shell 110 during the process of integrally injection molding the metal tab 310 with the wire holder 400, and the extension 314 is embedded in the wire holder 400.

[0051] It should be noted that the purpose of such design is to increase the contact area and friction between the wire holder 400 and the metal tab 310, thereby improving the fixing force of the wire holder 400 to the metal tab 310, so as to prevent the metal tab 310 from falling off due to loosening during use.

[0052] In the technical scheme of the utility model, through integrally injection molding the terminal block 400, the metal tab 310 and the wire 320, the stability of the connection between the metal tab 310 and the wire 320 is improved, and then in the case that the charger needs to support the weight of multiple battery packs, the problem of unstable connection possibly caused by welding is avoided, and the risk of the wire 320 falling off due to falling or vibration is reduced. The terminal assembly 300 integrally injection molded better seals the welding position of the wire 320 and the metal tab 310 in the terminal block 400, so as to prevent the problem of short circuit or poor conduction caused by moisture and dust. In addition, in the production process, the manual operation link of hook welding the wire 320 and the metal tab 310 is simplified, the production efficiency is improved, and the labor cost is saved.

[0053] Please continue to read Figures 1 to 4 In an embodiment of the utility model, the lower shell 120 is provided with a limiting groove 123, and the limiting groove 123 is arranged on the inner surface of the lower shell 120. In addition, the terminal block 400 is also provided with a clamping part 410 at the end away from the metal tab 310. It should be noted that the limiting groove 123 cooperates with the clamping part 410 to fix the terminal block 400 to the shell 100; when the upper shell 110 is fixedly connected with the lower shell 120, the terminal block 400 is located between the upper shell 110 and the lower shell 120.

[0054] In this embodiment, the longitudinal depth of the limiting groove 123 is half of the longitudinal height of the clamping part 410.

[0055] Specifically, the terminal block 400 is fixed to the lower shell 120, and when the upper shell 110 is connected with the lower shell 120, half of the projection of the terminal block 400 on the shell 100 is located in the upper shell 110 and the other half is located in the lower shell 120.

[0056] In this embodiment, the clamping part 410 is disc-shaped, and the limiting groove 123 is composed of a bottom groove and two side grooves. One end of the side groove is located at the end of the lower shell 120 away from the bottom wall 122 of the shell, and the other end is connected with the bottom groove. The longitudinal height of the side groove is half of the longitudinal height of the clamping part 410. That is, when the clamping part 410 is clamped with the limiting groove 123, the limiting groove 123 wraps half of the outer periphery of the clamping part 410 to increase the contact area between the limiting groove 123 and the clamping part 410, thereby improving the stability of the terminal block 400 fixed on the shell 100.

[0057] Optionally, the wire 320 is longitudinally extended and parallel to and in the same plane as the engaging portion 410 when the wire 320 is embedded in the terminal block 400. The design aims to ensure that the wire 320 has sufficient length to be embedded in the terminal block 400 to achieve the purposes of waterproofing, dustproofing, and anti-falling; and to make the wire 320 exposed outside the terminal block 400 in a downward hanging form, facilitating the subsequent production operation of connecting the wire 320 to the circuit board 200.

[0058] In the technical scheme provided in the embodiment, the terminal block 400 is fixed between the upper shell 110 and the lower shell 120 through the cooperation of the limiting groove 123 and the engaging portion 410, so that the terminal block 400 is prevented from moving due to vibration or impact during use, especially when the battery pack is plugged into the terminal assembly 300, the terminal block 400 is subjected to gravity, so that the terminal block 400 is firmly fixed on the shell 100. In addition, the terminal block 400 is installed by aligning the engaging portion 410 with the limiting groove 123 of the lower shell 120 and inserting it, without the use of additional fixing members such as screws or glue, which not only improves the production efficiency but also reduces the production cost.

[0059] Please refer to Figure 6 In an embodiment of the utility model, the outer surface of the shell 100 is provided with a containing groove 150, both sides of the containing groove 150 are provided with guide grooves 151, and the terminal block 400 is arranged on the groove bottom of the containing groove 150. The guide grooves 151 are used to guide the engagement of the battery pack and the terminal assembly 300 and fix the battery pack on the shell 100.

[0060] In the embodiment, the width of the containing groove 150 can be selected according to actual needs. Specifically, the width of the containing groove 150 is 0.1 to 1 mm wider than the width of the battery pack, so as to ensure that the containing groove 150 can accommodate the battery pack, while avoiding damage to the terminal block 400 or the insertion slot on the battery pack for mating with the terminal assembly 300 due to violent shaking caused by external force when the battery pack is plugged into the terminal assembly 300.

[0061] Optionally, the guide grooves 151 are arranged on the outer surface of the upper shell 110. It can be understood that the containing groove 150 includes a groove bottom and left and right groove walls, and the guide grooves 151 are arranged on the groove walls of the containing groove 150 on the upper shell 110. By arranging the guide grooves 151 on the upper shell 110, on the one hand, the battery pack and the terminal assembly 300 can be accurately combined, and on the other hand, the movement of the battery pack can be avoided, and the battery pack can be prevented from falling off the charger when the charger falls.

[0062] In the production process, since the terminal assembly 300 is integrally injection molded, in the process of assembling the charger, the wires 320 on the plurality of terminal assemblies 300 can be directly welded on the circuit board 200 in a furnace passing manner, which simplifies the traditional production process of manual hook welding connection, and further improves the production efficiency and reduces the production cost.

[0063] Optionally, the charger further comprises a plurality of terminal assemblies 300 distributed on both sides of the outer surface of the shell 100, so as to simultaneously charge a plurality of battery packs on one charger.

[0064] The number of terminal assemblies 300 distributed on both sides of the outer surface of the shell 100 is consistent and symmetrically arranged, so as to ensure the overall balance of the charger, reduce the instability caused by the center of gravity deviation in the case of supporting the weight of a plurality of battery packs, and prevent the charger from toppling or sliding due to external force in use.

[0065] The above description is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields within the technical concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A charger comprising a housing, a circuit board housed in the housing, and a terminal assembly connected to the circuit board; characterized in that: The shell comprises an upper shell and a lower shell connected to the upper shell, and the inside of the upper shell and the lower shell forms a cavity; the circuit board is accommodated in the cavity and fixedly connected with the shell; The terminal assembly comprises a metal tab, a wire connected to the metal tab, and a terminal seat installed on the shell, one end of the wire is welded with the metal tab, and the other end of the wire is electrically connected with the circuit board; Wherein, the terminal seat, the metal tab and the wire are integrally injection molded, and the end of the wire connected with the metal tab is embedded in the terminal seat.

2. The charger according to claim 1, wherein: The length of the wire embedded in the terminal seat is not less than 1 cm and not more than 3 cm.

3. The charger according to claim 1, wherein: The metal tab comprises a head and a tail, the head is used for electrical connection with the battery pack, and the tail is welded with the wire; Wherein, the end of the wire welded with the tail and the tail are embedded in the terminal seat and integrally injection molded with the terminal seat.

4. The charger according to claim 3, wherein: The tail is provided with at least one through hole; and / or, The tail is provided with an extension away from the upper shell.

5. The charger according to claim 1, wherein: The welding between the wire and the metal tab is impact welding.

6. The charger according to claim 1, wherein: The lower shell is provided with a limiting groove, and the limiting groove is arranged on the inner surface of the lower shell; The end of the terminal seat away from the metal tab is provided with a clamping part; Wherein, the limiting groove and the clamping part cooperate to fix the terminal seat to the shell; when the upper shell and the lower shell are fixedly connected, the terminal seat is located between the upper shell and the lower shell.

7. The charger of claim 6, wherein, The clamping part is disc-shaped; the limiting groove comprises a bottom groove and two side grooves, one end of the side groove is located at the end of the lower shell close to the upper shell, and the other end of the side groove is connected to the bottom groove; Wherein, the longitudinal height of the side groove is equivalent to half of the longitudinal height of the clamping part.

8. The charger according to claim 1, wherein: The outer surface of the shell is provided with a receiving groove, the two side walls of the receiving groove are provided with guide grooves, the guide grooves are used to guide the battery pack to engage with the terminal assembly and fix the battery pack to the shell, and the terminal seat is arranged on the groove bottom of the receiving groove.

9. The charger according to claim 8, wherein: The guide grooves are arranged on the outer surface of the upper shell.

10. The charger according to any one of claims 1 to 9, characterized in that, The charger further comprises: A plurality of terminal assemblies are symmetrically distributed on both sides of the outer surface of the shell.

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