Battery pack sliding rail structure and impact hammer

Abstract

The utility model discloses a battery pack slide rail structure and impact hammer, including the casing, the casing is equipped with the slide rail that is used for battery pack disassembly and assembly, the slide rail is equipped with the entrance, the slide rail includes mutually fixed connection plastic track and metal track, the plastic track is provided at the entrance and is integrated with the casing, and the metal track is provided with the metal track. The metal track is connected with the plastic track and extends in the direction away from the inlet. According to the battery pack sliding rail structure and the impact hammer, the battery pack is convenient to disassemble and assemble, sliding abrasion is reduced, and the service life of a product is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to impact hammer technical field more specifically, relate to a battery pack slide rail structure and impact hammer. BACKGROUND

[0002] In the field of electric tools, energy storage equipment, the slide rail structure between the battery pack and the host is the key component to realize quick disassembly and assembly. The traditional slide rail design adopts the sliding mode of plastic and plastic cooperation, that is, the slide rail body and the battery pack sliding groove are made of plastic material. However, the structure has the following significant defects in actual use:

[0003] 1. Large frictional resistance and easy adhesion: the friction coefficient of plastic material is relatively high, especially under high temperature, high humidity or frequent plug-in working conditions, the plastic contact surface is easy to cause adhesion or jamming phenomenon due to intermolecular force, resulting in poor battery pack plug-in, poor user experience.

[0004] 2. Insufficient wear resistance: the sliding friction of plastic to plastic can accelerate the surface wear, and after long-term use, the slide rail has scratches, deformation and other problems, resulting in increased fitting gap, easy loosening or even falling off of the battery pack after installation, which has safety hazards.

[0005] 3. Low structural strength: the plastic slide rail is difficult to withstand the mechanical impact of repeated insertion and removal of the battery pack, especially in the heavy load battery pack scene, the slide rail is easy to crack or deform plastically, which seriously affects the service life.

[0006] In view of the above problems, the prior art tries to reduce the friction by optimizing the plastic material formula (such as adding lubricant) or improving the surface texture of the slide rail, but these schemes can only delay the wear to a certain extent, and cannot fundamentally solve the material performance bottleneck.

[0007] Therefore, there is an urgent need for a slide rail structure that takes into account low friction, high wear resistance, long service life and smooth plug-in to solve the technical defects of the traditional slide rail. UTILITY MODEL CONTENTS

[0008] Therefore, the utility model aims to provide a battery pack slide rail structure and impact hammer, which facilitates the disassembly and assembly of the battery pack, reduces the sliding wear and improves the service life of the product.

[0009] In order to achieve the above purpose, in the first aspect, the application provides a battery pack slide rail structure, which comprises an outer shell, the outer shell is provided with a slide rail for disassembly and assembly of the battery pack, the slide rail is provided with an entrance, the slide rail comprises a plastic track and a metal track fixedly connected with each other, the plastic track is arranged at the entrance and is an integral structure with the outer shell, and the metal track is connected with the plastic track and extends away from the entrance.

[0010] By the technical scheme, the segmented composite structure of the plastic track and the metal track absorbs the positional deviation in the initial stage of the battery pack insertion through the elastic deformation of the plastic material, avoids the jam caused by the hard contact of the metal, bears the main load by the high wear-resistant surface of the metal track in the sliding process, greatly reduces the wear amount after long-term use, optimizes the plugging feel through the friction coefficient difference between the plastic and the metal (plastic μ≥0.3, metal coating μ≤0.15), and improves the overall life by more than 3 times of the traditional plastic sliding track.

[0011] With reference to the first aspect, in a further implementation form of the first aspect or the implementation forms thereof, the shell is provided with a convex rib, and the metal track wraps the convex rib and is smoothly connected with the plastic track.

[0012] By the technical scheme, the metal track forms mechanical interlocking by wrapping the convex rib of the shell, enhances the axial tensile strength, and the joint surface of the plastic track and the metal track is seamlessly transitioned through the injection molding process, eliminates the stress concentration at the joint, makes the sliding surface continuous and smooth, and reduces the vibration abnormal sound when the battery pack slides.

[0013] With reference to the first aspect, in a further implementation form of the first aspect or the implementation forms thereof, the shell is provided with a positioning groove, and one free end of the metal track is arranged in the positioning groove.

[0014] By the technical scheme, the end of the metal track is embedded in the positioning groove, limits the displacement of the metal track, and ensures the dimensional stability of the sliding track assembly under frequent plugging and unplugging.

[0015] With reference to the first aspect, in a further implementation form of the first aspect or the implementation forms thereof, the shell is provided with a positioning column, and the metal track is provided with a positioning hole in gap fit with the positioning column.

[0016] By the technical scheme, the gap fit of the positioning column and the positioning hole provides assembly guidance and avoids the installation deviation of the metal track; in combination with the subsequent hot riveting process, an anti-shearing connection structure is formed, so that the anti-shearing strength of the metal track is improved by more than 60% when bearing the heavy load of the battery pack.

[0017] With reference to the first aspect, in a further implementation form of the first aspect or the implementation forms thereof, after the positioning column passes through the positioning hole, a limiting end cap is formed on the top end of the positioning column through hot riveting, so that the metal bearing section and the shell form an anti-shearing connection structure, and the metal track and the shell are fixed as a whole.

[0018] By the technical scheme, the limiting end cap formed on the top end of the positioning column tightly presses the metal track on the surface of the shell, improves the connection reliability and stability, and eliminates the fretting wear caused by vibration; meanwhile, the mushroom-shaped structure of the end cap disperses stress and effectively reduces the brittle fracture of the riveting point.

[0019] In combination with the first aspect, in a further technical solution, the positioning columns are at least two, and a positioning rib is arranged between the two positioning columns, and the metal rail is provided with a notch for avoiding the positioning rib.

[0020] Through the above technical solution, the positioning rib fills the structural weak area between the adjacent positioning columns, thereby improving the overall rigidity of the shell; the U-shaped notch of the metal rail has a gap with the side wall of the positioning rib, thereby absorbing the deformation stress caused by the thermal expansion and cold contraction difference and preventing the metal rail from cracking due to thermal fatigue.

[0021] In combination with the first aspect, in a further technical solution, the slide rail is provided with an upper slide surface and a lower slide surface, and the plastic rail and the metal rail have a stepped height difference on the upper slide surface.

[0022] Through the above technical solution, the stepped difference between the upper slide surface of the plastic rail and the upper slide surface of the metal rail is designed, so that the guide surface is preferentially contacted with the plastic segment when the battery pack is inserted, and the initial guidance is completed by using the elastic deformation thereof; after entering the metal segment, the slide surface is contacted with the high-precision metal rail, the frictional resistance is reduced by more than 40%, and the plastic segment is avoided from participating in long-term sliding wear.

[0023] In combination with the first aspect, in a further technical solution, the upper slide surface of the plastic rail is lower than the upper slide surface of the metal rail.

[0024] Through the above technical solution, by means of the height sinking of the plastic rail, it is ensured that, after the battery pack is completely inserted, the slide surface thereof is only contacted with the metal rail, the long-term friction path of the plastic segment and the battery pack is completely isolated, the plastic wear problem is structurally avoided, and the service life is prolonged.

[0025] In a second aspect, the application provides a battery pack slide rail structure assembly, comprising a battery pack and the battery pack slide rail structure of the first aspect.

[0026] Through the above technical solution, the inclined guide surface of the slide groove of the battery pack is matched with the guide inclined surface of the plastic rail, so that "soft contact alignment" is realized; the planar slide surface is matched with the high-precision surface of the metal rail, so that "hard bearing sliding" is formed, and the smoothness of insertion and extraction is improved by more than 50%.

[0027] In combination with the second aspect, in a further technical solution, the battery pack is provided with a slide groove, an upper surface of the slide groove comprises a guide surface and a slide surface, when the battery pack is inserted along the inlet of the slide rail, the guide surface is first connected with the plastic rail, and during the sliding assembly of the battery pack and the slide rail, the slide surface is connected with the metal rail.

[0028] Through the above technical solution, the inclined angle of the guide surface of the slide groove is matched with the guide inclined surface of the plastic rail, so that the transverse component force during insertion is reduced, the pressure is dispersed, local wear is avoided, and the wear amount of a single insertion and extraction cycle is reduced to 1 / 5 of that of the conventional solution.

[0029] In summary, the present application has at least one of the following beneficial technical effects:

[0030] 1. Composite slide rail structure realizes gradient optimization of friction performance: by connecting the plastic track at the entrance end with the internal metal track in steps, the low hardness characteristic of plastic material is used to realize flexible guidance when the battery pack is inserted, reducing the initial alignment friction resistance; at the same time, the high wear resistance of the metal track bears the main sliding load, solving the technical contradiction of fast adhesion and wear of traditional all-plastic slide rails and difficult alignment of all-metal slide rails, and making the service life of the slide rail increase by more than 3 times.

[0031] 2. The plastic track is integrally injection molded with the shell, and the metal track is quickly assembled through a standardized positioning structure, which can adapt to the needs of battery packs of different sizes, reduce the mold development cost by more than 30%, and is especially suitable for batch manufacturing in high-vibration scenarios such as impact hammers.

[0032] 3. The metal track is axially limited by wrapping the convex ribs of the shell, and combined with the positioning groove fitting and the positioning column hot riveting to form a three-dimensional constraint to resist shear force and torsional force during insertion and removal.

[0033] 4. The stepped difference design of the upper sliding surface of the plastic track being lower than the metal track makes the guiding surface of the battery pack preferentially contact the plastic segment when inserted, and utilizes its elastic deformation to absorb alignment deviation. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0035] Figure 1 FIG. 1 is a perspective view of the battery pack slide rail structure of the present application;

[0036] Figure 2 FIG. 2 is a structure schematic view of area A in FIG. 1; Figure 1

[0037] Figure 3 FIG. 3 is a structure schematic view of the shell of the present application;

[0038] Figure 4 FIG. 4 is a structure schematic view of area B in FIG. 3; Figure 3

[0039] FIG. 5 is a structure schematic view of the metal track; Figure 5

[0040] Figure 6 FIG. 6 is a partial structure schematic view of an impact hammer;​​

[0041] Figure 7 Fig. 1 is a structural schematic diagram of a battery pack;

[0042] Figure 8 Fig. 2 is a structural schematic diagram of a battery pack and a slide rail in a disengaged state.

[0043] Reference signs:

[0044] 100, battery pack slide rail structure; 1, shell; 11, convex rib; 12, positioning groove; 13, positioning column; 14, positioning rib; 2, slide rail; 21, inlet; 22, plastic track; 221, upper sliding surface of plastic track; 222, lower sliding surface of plastic track; 23, metal track; 231, fixing lug; 2311, positioning hole; 232, notch; 233, U-shaped groove; 234, upper sliding surface of metal track; 235, lower sliding surface of metal track; 3, battery pack; 31, slide groove; 311, guide surface; 312, sliding surface. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0046] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] The embodiments of the present application will be described in detail below with reference to the drawings. The features in the following embodiments can be combined with each other without conflict.

[0049] Embodiment 1

[0050] Referring to Figures 1-5 The battery pack slide rail structure 100 provided by the application comprises an outer shell 1 and a slide rail 2, the slide rail 2 comprises two components, i.e., a plastic rail 22 and a metal rail 23, the slide rail 2 is arranged on the outer shell 1 and is provided with an entrance 21, the slide rail 2 is composed of the plastic rail 22 and the metal rail 23 which are fixedly connected with each other, the plastic rail 22 is located at the entrance 21 and is integrally formed with the outer shell 1 through an injection molding process, and the metal rail 23 extends away from the entrance 21, thereby reducing the frictional resistance, improving the wear resistance and prolonging the service life.

[0051] Referring to Figure 2 The slide rail 2 is divided into two sections, the first section is the plastic rail 22 close to the entrance 21, and the second section is the metal rail 23. This segmented arrangement is designed to fully exert the respective advantages: the soft plastic material is selected for the initial insertion stage to facilitate the guidance and positioning, and the hard and durable metal guide surface is switched to in the main working stroke to bear the main load. The plastic rail 22 is directly formed on the outer shell 1 through the injection molding process, thereby ensuring that the two are tightly combined without the risk of separation. For the metal rail 23, it is recommended to use a cold-rolled steel sheet or an aluminum alloy strip to be stamped and formed and then subjected to a surface hardening treatment, such as carburizing quenching or an anodic oxidation process, so as to improve the surface hardness and oxidation resistance.

[0052] Referring to Figure 3 and Figure 4 The outer shell 1 serves as the basic framework of the entire slide rail 2 and is made of high-performance engineering plastics such as polycarbonate or glass fiber reinforced nylon. Such materials have good toughness and temperature resistance and can adapt to complex working environments. In order to strengthen the overall rigidity of the outer shell 1, a plurality of longitudinally distributed convex ribs 11 are arranged on the inner wall of the outer shell 1. These convex ribs 11 can not only disperse external impact forces but also provide a stable support platform for the installation of the metal rail 23, and the metal rail 23 wraps around the convex ribs 11 and is smoothly connected with the plastic rail 22. A positioning rib 14 is longitudinally connected on the convex rib 11, and positioning columns 13 are arranged on both sides of the positioning rib 14.

[0053] Referring to Figure 4 and Figure 5 The metal rail 23 is bent from a metal sheet to form a U-shaped groove 233 for wrapping around the convex rib 11, and the upper and lower surfaces of the U-shaped groove 233 are a metal upper slide surface of the metal rail 2 connected with an upper slide surface of the plastic rail 2 and a metal lower slide surface 235 connected with a lower slide surface 222 of the plastic rail. The metal rail 23 is also provided with two fixed ears 231 connected with the U-shaped groove 233, a gap 232 is arranged between the two fixed ears 231 to avoid the positioning rib 14, and a positioning hole 2311 for the positioning column 13 to pass through is arranged on each of the two fixed ears 231. After the positioning column 13 passes through the positioning hole 2311, the two fixed ears 231 are fixed through heat pressing.

[0054] Please refer to Figure 2 , Figure 4 , Figure 5 In the transition area, in order to achieve smooth transition, on the one hand, it is necessary to ensure that there is no obvious step mutation in the transition part to avoid scratching the battery pack 3, and on the other hand, it is necessary to consider the relative displacement that may occur during long-term operation, so a certain tolerance compensation space is reserved. The specific method is to cover the exposed edge part on the corresponding position with a U-shaped bent metal piece, and lock it by welding or other permanent fixing means. In addition, the height difference between the upper and lower sliding surfaces of the plastic track 22 and the metal track 23 is also precisely designed, usually keeping the lower contact area slightly lower than the upper reference plane within the range of about 0.1-0.3 mm, so that it can slide smoothly and is convenient for assembly and maintenance.

[0055] It should be noted that the metal track 23 wraps the convex rib 11 and is smoothly connected with the plastic track 22; in addition, the shell 1 is provided with a positioning groove 12, and one free end of the metal track 23 is embedded in the positioning groove 12 to achieve accurate positioning. Positioning columns 13 are arranged on the shell 1, and the metal track 23 is provided with corresponding positioning holes 2311 which are gap-fitted therebetween, further increasing stability. For some embodiments, a limiting end cap can be formed on the top end of the positioning column 13 by hot riveting technology, thereby establishing a shear-resistant connection structure, so that the metal track 23 is more firmly fixed on the shell. If a more complex fixing mechanism is needed, a positioning rib 14 can be added between the two positioning columns 13, and a avoiding notch 232 is designed on the metal track 23 to facilitate assembly and positioning.

[0056] It is worth noting that the height difference between the upper and lower sliding surfaces of the slide rail 2: the upper sliding surface 221 of the plastic track is lower than the upper sliding surface 234 of the metal track, which can ensure smooth initial introduction and maintain stable later operation.

[0057] The positioning device can further optimize performance. The positioning groove 12 is added inside the shell 1, and the two free ends of the metal track 23 are both embedded in the positioning groove 12 to complete accurate positioning. At the same time, the shell 1 is provided with multiple positioning columns 13, and the metal track 23 is provided with multiple positioning holes 2311 which are gap-fitted with the positioning columns 13 one by one, and the top end of the positioning column 13 is formed into a limiting end cap after passing through the positioning hole 2311 by hot riveting, thereby realizing a multiple shear-resistant connection structure, so that the metal track 23 and the shell 1 are more stably combined as a whole. In order to further enhance the stability, a positioning rib 14 is arranged between every two positioning columns 13, and the metal track 23 is provided with a notch 232 which avoids the positioning rib 14 to adapt to the installation requirements.

[0058] The implementation principle of the embodiment is that the introduction of the metal rail 23 solves the various defects of the traditional all-plastic slide rail 2, especially in reducing friction, and significantly improves the user experience. The complementary advantages of the two different materials greatly extend the service life of the entire device and optimize the user experience. This improvement effectively overcomes the limitations of relying solely on modified plastics in the past, showing high practical value and development potential. By introducing precise positioning mechanisms and multiple reinforcement measures, not only does it improve the assembly precision of the slide rail 2, but also enhances the overall structural strength, especially when subjected to heavy loads, showing stronger reliability, greatly improving the loose and falling problems of traditional slide rails 2, and significantly improving the overall performance of the product.

[0059] Embodiment 2

[0060] Please refer to Figures 6-8 The embodiment provides a handheld electric tool, specifically an impact hammer, and the battery pack 3 of the impact hammer is inserted through the inlet 21 of the battery pack slide rail structure 100 to power the impact hammer.

[0061] Please refer to Figure 7 and Figure 8 The battery pack 3 is provided with a sliding groove 31, the upper surface of the sliding groove 31 includes a guide surface 311 and a sliding surface 312, and when the battery pack 3 is inserted along the inlet 21 of the battery pack slide rail structure 100, the guide surface 311 is first connected with the plastic rail 22, and during the sliding assembly of the battery pack 3 and the slide rail 2, the sliding surface 312 is connected with the metal guide rail. During the connection process, the lower surface of the sliding groove 31 abuts against the lower surface of the slide rail 2.

[0062] The above describes in detail the battery pack slide rail structure provided by the utility model. The principles and implementation methods of the utility model are described by applying specific examples in this paper, and the above embodiment is only used to help understand the method and core idea of the utility model. It should be noted that for ordinary skilled persons in the technical field, without departing from the principles of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A battery pack slide rail structure, characterized by, The shell is provided with a slide rail for dismounting and mounting the battery pack, the slide rail is provided with an entrance, the slide rail comprises a plastic rail and a metal rail fixedly connected with each other, the plastic rail is arranged at the entrance and is integrated with the shell, and the metal rail is connected with the plastic rail and extends away from the entrance.

2. The battery pack slide rail structure of claim 1, wherein, The shell is provided with a convex rib, the metal rail wraps the convex rib and is smoothly connected with the plastic rail.

3. The battery pack slide rail structure of claim 2, wherein, The shell is provided with a positioning groove, and one free end of the metal rail is arranged in the positioning groove.

4. The battery pack slide rail structure of claim 2, wherein, The shell is provided with a positioning column, and the metal rail is provided with a positioning hole in gap fit with the positioning column.

5. The battery pack slide rail structure of claim 4, wherein, After the positioning column passes through the positioning hole, a limiting end cap is formed on the top end of the positioning column by hot riveting, so that a shear-resistant connection structure is formed between the metal bearing segment and the shell, and the metal rail and the shell are fixed as a whole.

6. The battery pack slide rail structure of claim 4, wherein, The positioning column is at least two, and a positioning rib is arranged between the two positioning columns, and the metal rail is provided with a notch for avoiding the positioning rib.

7. The battery pack slide rail structure of claim 1, wherein, The slide rail is provided with an upper slide surface and a lower slide surface, and the plastic rail and the metal rail have a stepped height difference on the upper slide surface.

8. The battery pack slide rail structure of claim 7, wherein, The upper slide surface of the plastic rail is lower than the upper slide surface of the metal rail.

9. An impact hammer characterized by, The battery pack and the battery pack slide rail structure according to any one of claims 1 to 8 are provided.

10. The impact hammer of claim 9, wherein, The battery pack is provided with a sliding groove, the upper surface of the sliding groove comprises a guide surface and a sliding surface, when the battery pack is inserted along the entrance of the slide rail, the guide surface is first connected with the plastic rail, and during the sliding assembly of the battery pack and the slide rail, the sliding surface is connected with the metal rail.

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