Battery pack

Abstract

The utility model relates to a battery pack, which is adapted to an electric tool to provide power, the battery pack comprises a shell, a battery pack and an electric control board which are arranged on the shell, and a plugging part formed on the upper end surface of the shell, and the electric control board is provided with a terminal connected with the electric tool; the plug-in part is provided with a plug-in block protruding upwards from the shell, a sliding rail protruding outwards from the plug-in block, a plurality of plug-in ports penetrating through the plug-in block, isolation walls located between the plug-in ports and a fool-proof structure protruding upwards from the shell, the terminals are located in the plug-in ports, and the fool-proof structure is located in the plug-in ports in the transverse direction perpendicular to the plug-in direction. The ratio of the width of the inserting block to the width of the sliding rail is 0.7-0.95, and the fool-proof structure is located at the rear end of the isolation wall. According to the utility model, the ratio of the width of the area where the insertion block is located to the width of the slide rail is set within the range of 0.7-0.95, so that the structural strength of the slide rail is high, and the use requirements of the battery pack under severe working conditions can be met.

Description

[Technical Field]

[0001] This utility model relates to a battery pack, and more particularly to a battery pack for cordless tools. [Background Technology]

[0002] Among the many existing cordless power tools and other cordless devices, battery packs are typically chosen as the power source for ease of movement and portability. Nowadays, battery packs are widely used in power tools such as drills, hammer drills, sledgehammers, angle grinders, hair dryers, lawn mowers, lawnmowers, and electric shears, as well as electrical equipment such as lighting fixtures, audio equipment, and outdoor power supplies, and are very popular with the general public.

[0003] However, the battery pack is mechanically and electrically connected to the cordless device through a plug-in part. Under certain special working conditions, the smaller battery pack slide rail may break due to the vibration of the cordless device or accidental drop. For example, the vibration of the cordless device may cause the guide rail of the plug-in part to break.

[0004] Therefore, it is indeed necessary to provide an improved battery pack to overcome the shortcomings of the existing technology. [Summary of the Invention]

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a battery pack with high structural strength and convenient insertion and removal.

[0006] The present invention addresses the existing technical problems by adopting the following technical solution: a battery pack adapted to power tools to provide power, the battery pack including a housing, a battery pack and an electronic control board mounted on the housing, and a plug-in portion formed on the upper end face of the housing, the electronic control board being provided with terminals for connection to the power tool; the plug-in portion having a plug-in block protruding upward from the housing, a slide rail protruding outward from the plug-in block, several plug interfaces penetrating the plug-in block, an isolation wall located between the plug interfaces, and a foolproof structure protruding upward from the housing, the terminals being located within the plug interfaces, and in the transverse direction perpendicular to the plugging direction, the ratio of the width of the plug-in block to the width of the slide rail being 0.7-0.95, the foolproof structure being located at the rear end of the isolation wall.

[0007] A further improvement is as follows: the plug-in block has a first part connected to the slide rail and a second part and a third part connected to the first part, the plug-in part has a guide slide rail protruding from the side wall of the second part, and the extension direction of the guide slide rail intersects with the extension direction of the slide rail.

[0008] A further improvement is that the width of the guide rail gradually narrows along the direction toward the third part.

[0009] A further improvement is that the angle between the extension direction of the guide rail and the extension direction of the slide rail is 105°-165°.

[0010] A further improvement is that, in the lateral direction perpendicular to the insertion direction, the ratio of the anti-foolproof structure to the isolation wall is 0.6-0.7.

[0011] A further improvement is as follows: the width of the error prevention structure is 1-8mm, the height of the error prevention structure is 1-10mm, and the length of the error prevention structure is 2-15mm.

[0012] A further improvement is as follows: the plug-in portion also has a reinforcing member installed on the plug-in block and a positioning hole penetrating the slide rail perpendicular to the plug-in direction. The reinforcing member has a first reinforcing portion connected to the lower end face of the slide rail, a second reinforcing portion connected to the side wall of the plug-in block, and a third reinforcing portion connected to the upper end face of the housing. The first reinforcing portion is parallel to the third reinforcing portion, and the second reinforcing portion is perpendicular to the first reinforcing portion. The positioning holes are spaced apart in the slide rail, and the slide rail has a notch that communicates with the positioning holes. The first reinforcing portion is exposed in the notch, and the notch is configured as a clearance space when the reinforcing member is embedded in the slide rail.

[0013] A further improvement is that the rear end of the third part is provided with a chamfer, which is configured to guide the insertion and removal of the power tool.

[0014] A further improvement is that the width of the plug block is at least 48mm, the width of the area where the slide rail is located is no more than 70mm, and along the plugging direction, the ratio of the length of the slide rail to the length of the plug block is 0.4-0.5.

[0015] A further improvement is that the ratio of the height of the slide rail to the height of the plug block is 0.58-0.7.

[0016] Compared with the prior art, the present invention has the following advantages: by configuring the ratio of the width of the plug block area to the width of the slide rail in the range of 0.7-0.95, the slide rail has high structural strength and can meet the usage requirements of the battery pack under harsh working conditions. [Attached Image Description]

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the battery pack of this utility model;

[0019] Figure 2 yes Figure 1 A structural schematic diagram of the battery pack from another angle;

[0020] Figure 3 yes Figure 1 The diagram shows the disassembled components of the battery pack.

[0021] Figure 4 yes Figure 1 A magnified view of a portion of the battery pack shown;

[0022] Figure 5 yes Figure 2 A magnified view of a portion of the battery pack shown;

[0023] Figure 6 yes Figure 4 The diagram shows the structure of the reinforcing member in the battery pack.

[0024] Figure 7 This is a structural diagram of the housing part of a power tool;

[0025] Figure 8 This is a schematic diagram of the housing part of the charger.

Detailed Implementation Methods

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0028] Please see Figure 1 and Figure 2 As shown, the embodiments of this utility model relate to a battery pack, commonly referred to as a "secondary battery," which can be installed in various cordless electrical devices. Cordless electrical devices can be electric work machines powered by motors, such as drills, lawnmowers, and hair dryers, or electrical devices without motors, such as lights, radios, and speakers. Alternatively, the electrical device can also be a charging device that supplies power to the battery pack.

[0029] The electrical equipment includes a battery pack housing section. The battery pack can be installed in the battery pack housing section by sliding relative to the battery pack housing section along a predetermined insertion direction. In this embodiment, the direction in which the battery pack slides when it is installed into the battery pack housing section is called the rearward direction; the direction in which the battery pack slides when it is removed from the battery pack housing section is called the forward direction. Furthermore, when viewed from the front of the battery pack with it installed in the battery pack housing section, the direction in which the battery pack housing section is located is called the upward direction, and the opposite direction is called the downward direction. The direction orthogonal to the rearward and upward / downward directions is called the left-right direction.

[0030] In this embodiment, the battery pack 100 includes: a housing 1, a bracket 7 installed within the housing 1, an electronic control board 5 and a battery pack 8, terminals 6 connected to the electronic control board 5, a foolproof structure 4 protruding upward from the upper end surface of the housing 1, and an operating member 9 movably installed on the housing 1. A plug-in portion 2 is formed on the upper end surface of the housing 1, and the plug-in portion 2 is configured to mechanically connect with the tool receiving portion 201 of the power tool 200 and / or the charging receiving portion 301 of the charger 300 along the plug-in direction. The terminals 6 are configured to connect to the tool plug-in piece 203 of the power tool 200 and / or the charging plug-in piece 303 of the charger 300 to form an electrical connection for power transmission. The battery pack 100 is detachably installed to the power tool 200 or the charging device 300 via the operating member 9, providing a stable and reliable connection for supplying power to the power tool 200 or for the charging device 300 to output electrical energy.

[0031] The aforementioned housing 1 may be made of plastic or other composite materials. The housing 1 has a first housing 11 and a second housing 12 and a receiving space formed between the first housing 11 and the second housing 12. The battery pack 8 is installed in the receiving space. The first housing 11 and the second housing 12 are configured as upper and lower covers, and the first housing 11 is the upper housing and the second housing 12 is the lower housing. The upper housing and the lower housing may be provided with a matching structure for positioning, and the two are tightly connected by screws.

[0032] The aforementioned first housing 11 has a molded cover 111, a first opening 112 and a second opening 113 extending from top to bottom through the cover 111, and a plug-in port 2 formed on the upper surface of the cover 111 and fitting into the battery pack receiving portion. The first opening 112 and the second opening 113 are used to accommodate the operating member 9. The operating member 9 is fixed to the first housing 11 by a limiting structure, resulting in a simple structure and convenient installation. Specifically, the button 9a of the operating member 9 is received in the first opening 112, and the latch 9b of the operating member 9 is received in the second opening 113. The button 9a and the latch 9b are engaged in the first housing 11 in a manner that allows them to move vertically. The latch 9b is used to engage the tool latch slot 204 of the power tool 200 and / or the charging latch slot 304 of the charger 300.

[0033] In this embodiment, the second housing 12 is a cuboid with an opening on the upper side, which is mainly used to support the battery pack 8 and prevent the battery pack 8 from falling and failing.

[0034] Combination Figures 3 to 6 As shown, the aforementioned plug-in portion 2 is an interface for the power tool 200 and / or charger 300 to mechanically and / or electrically connect to the battery pack 100.

[0035] In this embodiment, the aforementioned insertion portion 2 includes an insertion block 21 protruding upward from the upper end face of the housing 1, a slide rail 22 and a guide slide rail 24 protruding from the side wall of the insertion block 21 perpendicular to the insertion direction, an insertion interface 23 penetrating the insertion block 21 in the vertical direction, a reinforcing member 25 mounted on the insertion block 21, a positioning hole 26 at least partially penetrating the slide rail 22 in the vertical direction, and a receiving groove 27 formed between the slide rail 22 and the upper end face of the housing 1. The insertion block 21, slide rail 22, insertion interface 23, guide slide rail 24, reinforcing member 25, positioning hole 26, and receiving groove 27 can all be integrally injection molded from a battery pack end cap injection mold.

[0036] The aforementioned plug-in block 21 is divided into three areas: a first part 211 connected to the slide rail 22, a second part 212 connected to the guide slide rail 24, and a third part 213 with a plug-in interface 23. The first part 211, the second part 212, and the third part 213 are arranged sequentially along the insertion and removal direction and connected to each other. The length of the plug-in block 21 is between 70-80 mm and the width is between 45-55 mm to meet the structural strength requirements of the plug-in part 2 and to prevent the slide rail 22 from tearing under vibrating operating conditions. Furthermore, the width of the connector 21 is between 48-52mm, which can be applied to relatively lightweight 2.0Ah and 4.0Ah battery packs; preferably, the width of the connector 21 is 50.5mm, which facilitates adaptation to power tools 200 and / or chargers 300 of various sizes, and the connector 21 is suitable for battery packs 100 of various weights and / or capacities, such as 8.0Ah and 12.0Ah battery packs.

[0037] In this embodiment, the slide rail 22 protrudes from the first portion 211 in the left and right directions, respectively, for engaging with the tool groove 205 of the power tool 200 and / or the charging groove 305 of the charger 300. Furthermore, in the left and right direction, the width of the area where the slide rail 22 is located is greater than the width of the area where the plug-in block 21 is located, and the ratio of the width of the area where the plug-in block 21 is located to the width of the area where the slide rail 22 is located is between 0.7 and 0.95. This ensures that the slide rail 22 has sufficient strength to meet the requirements of high-vibration working environments and conforms to the development requirements of miniaturization. Moreover, the width of the slide rail 22 is no greater than 70 mm; preferably, the width of the slide rail 22 is 59.5 mm, which satisfies the strength requirements while minimizing space requirements.

[0038] Meanwhile, in the front-to-back direction, the ratio of the length of the slide rail 22 to the length of the plug-in block 21 is between 0.4 and 0.5, which is used to fit the tool slide 205 and / or the charging slide 305, forming a reliable connection within a certain length range to support the weight of the battery pack 100 itself. In addition, in the vertical direction, the ratio of the height of the slide rail 22 to the height of the plug-in block 21 is between 0.58 and 0.7, and the slide rail 22 occupies at least half the height of the plug-in block 21, which makes the slide rail 22 structurally strong and meets the safe use requirements of the battery pack 100, the power tool 200 and / or the charger 300.

[0039] Preferably, the ratio of the width of the area where the plug-in block 21 is located to the width of the area where the slide rail 22 is located is in the range of 0.82-0.84, the ratio of the length of the slide rail 22 to the length of the plug-in block 21 is in the range of 0.44-0.48, and the ratio of the height of the slide rail 22 to the height of the plug-in block 21 is 0.6-0.64. This further enhances the strength of the slide rail 22 and can effectively guide the sliding action of the power tool 200 and / or charger 300 until the plugging is completed.

[0040] In this embodiment, the guide rail 24 protrudes from the side wall of the second part 212 in the left-right direction. The guide rail 24 is generally inclined to serve as a guide and avoid operational errors such as collisions caused by misalignment during insertion and removal. Furthermore, the extension direction of the guide rail 24 intersects the extension direction of the slide rail, and the width of the guide rail 24 gradually narrows along the direction toward the third part 213. This allows the tool receiving part 201 and / or the charging receiving part 301 to directly enter the area of ​​the narrower third part 213 without obstruction during the process of connecting the battery pack 100 to the power tool 200 and / or the charger 300. Then, guided by the guide rail 24, the tool groove 205 and / or the charging groove 305 combine with the slide rail 22, making the mechanical insertion and removal of the battery pack 100 and the power tool 200 and / or the charger 300 smooth, which better meets the requirements of ergonomics. In addition, to improve the guiding effect of the plug block 21, a chamfer 213a is provided at the rear end of the third part 213. The chamfer 213a is configured to guide the plugging and unplugging of the power tool 200 and / or charger 300.

[0041] Furthermore, the angle between the extension direction of guide rail 24 and the extension direction of guide rail 22 is 105°-165°, which provides the best guiding effect.

[0042] In this embodiment, multiple plug interfaces 23 are spaced apart by the isolation wall 214 of the plug block 21, and at least one plug interface 23 is equipped with a plug terminal 6. The width of the isolation wall 214 is greater than the width of the plug interface 23 to prevent accidental short circuits between the plug terminals 6.

[0043] Furthermore, the battery pack 100 is provided with a foolproof structure 4 located at the rear end of the isolation wall 214. The foolproof structure 4 engages with the tool identification structure 202 of the power tool 200 and / or the charging identification structure 302 of the charger 300 to prevent the battery pack 100 from being mistakenly inserted into incompatible electrical equipment. At the same time, in order to avoid the foolproof structure 4 affecting the normal insertion action of the power tool 200 and / or the charger 300, there is a gap between the projection of the terminal 6 and the foolproof structure 4 on the insertion plane, so that the movement path of the terminal 6 is avoided when designing the foolproof structure 4. The insertion plane is a vertical plane composed of the up-down and left-right directions, and the insertion direction is perpendicular to the insertion plane. In the horizontal direction perpendicular to the insertion direction, the ratio of the foolproof structure 4 to the isolation wall 214 is 0.6-0.7 to prevent the foolproof structure 4 from interfering with other structures of the battery pack 100.

[0044] Due to the limitations of the tool identification structure 202 and the charging identification structure 302, and in order to meet the requirements of foolproofing, the foolproofing structure 4 is usually set as a foolproofing protrusion or groove. In this embodiment, the foolproofing structure 4 is a foolproofing protrusion. The width of the foolproofing structure 4 is in the range of 1-8mm, the height is in the range of 1-10mm, and the length is in the range of 2-15mm. Furthermore, the ratio of the width of the foolproofing structure 4 to the width of the isolation wall 214 is between 0.4 and 0.8, which can ensure effective foolproofing and obstacle avoidance.

[0045] In this embodiment, the reinforcing member 25 has a first reinforcing portion 251 connected to the lower end face of the slide rail 22, a second reinforcing portion 252 connected to the side wall of the insertion block 21, a third reinforcing portion 253 connected to the upper end face of the housing 1, and a limiting hole 254 penetrating the third reinforcing portion 253. The first reinforcing portion 251 is parallel to the third reinforcing portion 253, and the second reinforcing portion 252 is perpendicular to the first reinforcing portion 251. Positioning holes 26 are spaced apart in the slide rail 22 for positioning the battery pack end cap injection mold during the injection molding process. The limiting hole 254 is configured to position the third reinforcing portion 253 of the reinforcing member 25. The first reinforcing portion 251 is exposed at the notch 221, the second reinforcing portion 252 abuts against the side wall of the receiving groove 27, and the third reinforcing portion 253 is embedded inside the housing 1, so that the reinforcing member 25 can both improve the strength of the housing 1 and prevent wear on the side wall of the slide rail 22.

[0046] Meanwhile, the slide rail 22 is provided with a notch 221, which reduces weight and serves as clearance space for the positioning part during mold processing. The notch 221 connects to the positioning hole 26, and the first reinforcing part 251 is exposed through the notch 221. This notch 221 is configured as clearance space when the reinforcing member 25 is embedded into the slide rail 22. During the injection molding process of the first housing of the battery pack 100, the notch 221 is formed to adapt to the positioning part of the battery pack end cap injection mold. Specifically, the notch 221 has a stepped wall 221a parallel to the second reinforcing part 252 and a guide wall 221b connected to the stepped wall 221a. The first reinforcing part 251 is located below the guide wall 221b, and the guide wall 221b connects the stepped wall 221a and the first reinforcing part 251. The extension direction of the guide wall 221b intersects the extension direction of the step wall 221a. Furthermore, the angle between the extension direction of the guide wall 221b and the extension direction of the step wall 221a is 100°-140°, which is used to guide and position the reinforcing member 25.

[0047] Combination Figure 2 As shown, the battery pack 8 can be composed of 10 cells connected in series and parallel. Specifically, the 10 cells are electrically connected in a series configuration. In this case, the rated voltage of the battery pack 100 is 40V, the rated capacity is 4.0Ah, and the weight is 0.3kg-0.8kg. More specifically, the weight of the battery pack 100 is 0.5kg-0.6kg.

[0048] The battery pack 8 is housed within the bracket 7, which secures each battery cell and prevents it from shifting within the housing 1. The control board 5 is attached to the bracket 7, and can be positioned above the bracket 7 and fixedly connected to it.

[0049] Specifically, the bracket 7 has a first bracket assembly for mounting the left end of the battery pack 8 and a second bracket assembly for fixing the right end of the battery pack 8, and the first bracket assembly and the second bracket assembly are connected by snaps and / or screws.

[0050] In this embodiment, the electronic control board 5 is electrically connected to the battery pack 8 and is used to control the charging and discharging of the battery pack 8. The electronic control board 5 will detect the remaining power of the battery pack 8 in real time and forcibly shut it off when the battery pack 8 enters an overcharge / over-discharge state. In addition, the operating member 9 is installed in the above-mentioned receiving space and protrudes to the outside of the housing 1, so that the operator can press to unlock it.

[0051] This invention configures the ratio of the width of the area where the plug block 21 is located to the width of the slide rail 22 within the range of 0.7-0.95, which makes the slide rail 22 structurally strong and can meet the usage requirements of the battery pack 100 under harsh working conditions.

[0052] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternatives to the battery pack of this utility model can be found without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. A battery pack adapted to power tools to provide power, the battery pack comprising a housing, a battery pack mounted on the housing, a control board, and a plug-in portion formed on the upper end face of the housing, the control board being provided with terminals for connection to the power tool; characterized in that: The plug-in portion has a plug-in block protruding upward from the housing, a slide rail protruding outward from the plug-in block, several plug interfaces penetrating the plug-in block, an isolation wall located between the plug interfaces, and a foolproof structure protruding upward from the housing. The terminal is located inside the plug interface. In the transverse direction perpendicular to the plug-in direction, the ratio of the width of the plug-in block to the width of the slide rail is 0.7-0.

95. The foolproof structure is located at the rear end of the isolation wall.

2. The battery pack according to claim 1, characterized in that: The plug-in block has a first portion connected to the slide rail and a second and a third portion connected to the first portion. The plug-in portion has a guide slide rail protruding from the side wall of the second portion, and the extending direction of the guide slide rail intersects the extending direction of the slide rail.

3. The battery pack according to claim 2, characterized in that: The width of the guide rail gradually narrows along the direction toward the third part.

4. The battery pack according to claim 3, characterized in that: The angle between the extension direction of the guide slide rail and the extension direction of the slide rail is 105°-165°.

5. The battery pack according to claim 1, characterized in that: In the transverse direction perpendicular to the insertion direction, the ratio of the foolproof structure to the isolation wall is 0.6-0.

7.

6. The battery pack according to claim 5, characterized in that: The width of the error-proof structure is 1-8mm, the height of the error-proof structure is 1-10mm, and the length of the error-proof structure is 2-15mm.

7. The battery pack according to claim 1, characterized in that: The plug-in portion also has a reinforcing member installed on the plug-in block and a positioning hole that passes through the slide rail perpendicular to the plug-in direction, the positioning holes being spaced apart within the slide rail.

8. The battery pack according to claim 2, characterized in that: The rear end of the third part is chamfered, and the chamfer is configured to guide the insertion and removal of the power tool.

9. The battery pack according to claim 1, characterized in that: The width of the plug block is at least 48mm, the width of the area where the slide rail is located is no more than 70mm, and along the plugging direction, the ratio of the length of the slide rail to the length of the plug block is 0.4-0.

5.

10. The battery pack according to claim 1, characterized in that: The ratio of the height of the slide rail to the height of the plug block is 0.58-0.7.

Images