Manipulator, battery clamp and tray lining matched with battery clamp

Abstract

The utility model discloses a manipulator, a battery clamp and a tray lining matched with the battery clamp for use, the battery clamp comprises a clamp body, a pushing mechanism and a clamping structure, a communication cavity for fluid to pass through is arranged in the clamp body, a first opening is arranged on the communication cavity, and the communication cavity is communicated with a sliding cavity arranged in the clamp body; the pushing mechanism comprises a first pushing rod and a second pushing rod which are slidably connected to the clamp body. The clamping structure comprises a first clamping part and a second clamping part, and the first clamping part and the second clamping part are oppositely arranged in a matched mode so as to be used for clamping a battery; one end of the first pushing rod is slidably connected into the sliding cavity, the other end of the first pushing rod is connected with the first clamping part, one end of the second pushing rod is slidably connected into the sliding cavity, and the other end of the second pushing rod is connected with the second clamping part. According to the battery clamp disclosed by the utility model, the battery which is eccentrically placed can be clamped, and the battery shell damage or the safety risk caused in the clamping process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery clamping device technology, and in particular to a robotic arm, a battery clamp, and a tray liner used in conjunction with it. Background Technology

[0002] Currently, cylindrical battery trays are relatively large in size and have a high number of channels, meaning they can hold a large number of batteries. Battery trays are generally injection-molded, and errors can occur during the injection molding process. Taking a 324-channel tray as an example, it has 18 rows and 18 columns of battery slots. Using the first battery slot on the left in each row as a reference, the position deviation of the rightmost battery slot is ±0.5mm. There are also tolerances in the slot diameter of the battery tray; the battery slot diameter is 47.2mm, the battery diameter is 46mm, and the gap is 1.2mm.

[0003] In existing technology, the battery grippers on cylindrical production lines are configured to grip eighteen batteries at a time, such as... Figure 1 As shown, 18 batteries need to be grasped at once, requiring extremely high tolerances. The tolerance for the 18th battery is as large as 1.7mm. Existing robotic arm designs can only accommodate a tolerance of ±1mm. However, the gripper's gripper force may become inconsistent on both sides of the battery due to changes in battery position. This could cause interference between the gripper and the battery during grasping, resulting in battery compression or even excessive force that could deform the battery. This leads to a high failure rate, an inability to achieve eccentric gripping, disruption of production line cycle time, and even direct damage to battery casings or safety risks. Utility Model Content

[0004] In view of this, the present invention provides a battery clamp that can clamp an eccentrically placed battery, reducing the risk of damage to the battery casing or other safety hazards during the clamping process, and thus improving safety.

[0005] This utility model also provides a tray liner and a robotic arm for use with a battery clamp.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery clamp, comprising:

[0008] The clamping body has an internal communicating chamber for fluid passage, and the communicating chamber has a first opening. The communicating chamber communicates with a sliding chamber disposed within the clamping body.

[0009] The pushing mechanism includes a first pushing rod and a second pushing rod that are slidably connected to the clamp body;

[0010] The clamping structure includes a first clamping part and a second clamping part, which are configured to clamp the battery in a relatively cooperative manner.

[0011] One end of the first push rod is slidably connected to the sliding cavity, and the other end is connected to the first clamping part. One end of the second push rod is slidably connected to the sliding cavity, and the other end is connected to the second clamping part.

[0012] As can be seen from the above technical solution, the battery clamp provided by this utility model, because the sliding cavity is connected to the connecting chamber, and the fluid in the connecting chamber has fluidity, thereby achieving pressure balance at the ends of the first and second push rods located in the sliding cavity. When the battery is placed eccentrically, one of the first and second push rods first contacts the side of the battery. Due to the blocking effect of the battery placed in the placement slot, the push rod in contact with the battery no longer moves, and the chamber connected to this push rod side no longer receives fluid, so the pressure on this side no longer increases, thereby preventing the push rod from damaging the battery due to excessive pressure. At the same time, the other push rod continues to move towards the battery even when liquid enters through the first opening, until this push rod also contacts the battery, thus clamping the battery. Due to the fluidity of the fluid in the connecting chamber, after the battery is clamped and removed from the placement slot, the fluid in the connecting chamber flows in the chamber until the first and second push rods are in a balanced state of alignment, thereby achieving automatic alignment during the battery clamping process, so that the battery will be adjusted to the centered position when placed. The battery clamp of this invention can clamp batteries that are placed off-center without applying excessive force to one side of the battery during the clamping process, thus reducing the risk of battery casing damage or other safety hazards caused by excessive clamping force on one side.

[0013] This utility model also provides a robotic arm, including a support plate and a battery clamp connected to the support plate. The battery clamp is the aforementioned battery clamp, and multiple battery clamps are arranged sequentially along the length direction of the support plate.

[0014] The robotic arm of this invention includes the aforementioned battery gripper, and therefore possesses the advantages of the aforementioned battery gripper, which will not be elaborated here.

[0015] This utility model also provides a tray liner for use with a battery clamp, which is placed on a tray. The battery clamp is the aforementioned battery clamp. The tray liner includes a base plate and a placement groove. The placement groove is disposed on the base plate, and the opening of the placement groove is provided with an inclined surface for guiding the placement of the battery.

[0016] The tray liner of this utility model, used in conjunction with the battery clamp, can effectively prevent hard interference from the placement slot to the battery held by the battery clamp when it is placed, thus reducing damage to the battery casing. Attached Figure Description

[0017] 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 these drawings without creative effort.

[0018] Figure 1 A simplified structural diagram of the battery clamp connected to the support plate at one angle according to an embodiment of the present invention;

[0019] Figure 2 A simplified structural diagram of the battery clamp connected to the support plate at another angle according to an embodiment of this utility model;

[0020] Figure 3 A simplified structural diagram showing the battery clamp connected to the support plate at another angle according to an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the battery clamp provided in an embodiment of the present invention after clamping the battery;

[0022] Figure 5 A schematic diagram of the battery clamp provided in an embodiment of this utility model at one angle;

[0023] Figure 6 This is a structural schematic diagram of the battery clamp provided in another embodiment of the present utility model;

[0024] Figure 7 for Figure 6 A cross-sectional view of the AA position;

[0025] Figure 8 A partial cross-sectional view of the connection position of the first push rod provided for an embodiment of this utility model;

[0026] Figure 9 A schematic diagram of the structure of the tray liner provided in this embodiment of the present invention when the battery is placed in the aligned state with the battery;

[0027] Figure 10 A schematic diagram of the structure of the placement slot at one angle provided in an embodiment of this utility model;

[0028] Figure 11This is a schematic diagram of the placement slot of the tray liner provided in this embodiment of the present invention and the structure of the battery when it is placed in a non-aligned state.

[0029] in:

[0030] 1. Support plate

[0031] 2. Battery clamp,

[0032] 201. Clamping body; 202. First opening; 203. Clamping structure; 204. Connecting chamber; 2041. First sub-chamber; 2042. Second sub-chamber; 205. First gripper; 206. First rod; 207. First piston disc; 208. Second opening; 209. First sliding sleeve; 210. Second gripper; 211. Second rod; 212. Second piston disc; 213. Third opening; 214. Second sliding sleeve; 215. First sealing ring.

[0033] 3. Battery

[0034] 4. Control valves,

[0035] 5. Tray lining,

[0036] 501. Inclined surface; 502. Base plate; 503. Placement groove. Detailed Implementation

[0037] This utility model discloses a battery clamp that can clamp an eccentrically placed battery, reducing battery casing damage or safety risks during the clamping process and improving safety.

[0038] This utility model also discloses a tray liner and a robotic arm used in conjunction with a battery clamp.

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] See Figures 1 to 8The battery clamp 2 of this utility model includes a clamping body 201, a pushing mechanism, and a clamping structure 203. The clamping body 201 has a communicating chamber 204 for fluid passage, and a first opening 202 for fluid to flow into or out of the communicating chamber 204. The communicating chamber 204 communicates with a sliding cavity disposed within the clamping body 201. The pushing mechanism includes a first pushing rod and a second pushing rod slidably connected to the clamping body 201. The clamping structure 203 includes a first clamping part and a second clamping part, which are configured to clamp a battery 3 between them. One end of the first pushing rod is slidably connected to the sliding cavity, and the other end is connected to the first clamping part. One end of the second pushing rod is slidably connected to the sliding cavity, and the other end is connected to the second clamping part.

[0041] The battery clamp 2 of this invention, because the sliding cavity is connected to the connecting chamber 204, and because the fluid in the connecting chamber 204 is fluid, achieves pressure balance at the ends of the first and second push rods located in the sliding cavity. When the battery 3 is placed eccentrically, one of the first and second push rods first contacts the side of the battery 3. Due to the blocking effect of the battery 3 placed in the placement slot, the push rod in contact with the battery 3 stops moving, and the chamber connected to this push rod side no longer receives fluid, so the pressure on this side no longer increases, thus preventing the push rod from damaging the battery 3 due to excessive pressure. At the same time, the other push rod continues to move towards the battery 3 even when liquid enters the first opening 202, until this push rod also contacts the battery 3, achieving clamping of the battery 3. Due to the fluidity in the connecting chamber 204, after the battery 3 is clamped and removed from the placement slot, the fluid in the connecting chamber 204 flows within the chamber until the first and second push rods are in a balanced, centered state, thus achieving automatic centering during the battery 3 clamping process, ensuring that the battery 3 is adjusted to a centered position during placement. The battery clamp 2 of this utility model can clamp the eccentrically placed battery 3 without applying excessive force to one side of the battery during the clamping process, thus reducing the risk of battery casing damage or safety issues caused by excessive clamping force on one side.

[0042] To reliably grip the battery 3, in one embodiment, the first clamping part includes a first jaw 205, and the second clamping part includes a second jaw 210. The first jaw 205 and the second jaw 210 are arc-shaped plates corresponding to the side curvature of the battery 3, and their concave arc surfaces are arranged opposite to each other. To reduce wear on the battery surface when the first jaw 205 and the second jaw 210 clamp the battery 3, a silicone layer is adhered to the arc-shaped surfaces of the first jaw 205 and the second jaw 210 that contact the surface of the battery 3. By providing the silicone layer, not only is the contact surface between the jaws and the battery 3 made flexible, but the frictional force during contact is also increased.

[0043] Specifically, the sliding cavity includes a first sliding chamber B and a second sliding chamber C, as shown below. Figure 7 As shown, the first push rod is slidably connected to the first sliding chamber B, and the second push rod is slidably connected to the second sliding chamber C. One side of the first opening 202 is a first sub-chamber 2041 communicating with the first sliding chamber B, and the other side of the first opening 202 is a second sub-chamber 2042 communicating with the second sliding chamber C. In one embodiment, the first opening 202 is disposed on the central axis of symmetry of the clamping body 201, and the first sub-chamber 2041 and the second sub-chamber 2042 are symmetrically disposed with respect to the first opening 202. In other embodiments, the first opening 202 is not disposed on the central axis of symmetry of the clamping body 201.

[0044] Furthermore, to facilitate the reciprocating motion of the first and second push rods, thereby enabling the clamping structure 203 to grip and release the battery 3, the clamping body 201 is also provided with a second opening 208 and a third opening 213. The second opening 208 communicates with the first sliding chamber B, and the third opening 213 communicates with the second sliding chamber C. Specifically, the first push rod includes a first piston disc 207 and a first rod body 206 connected together. The end of the first rod body 206 away from the first piston disc 207 is connected to the first gripper 205. The first rod body 206 is slidably connected to the clamping body 201, and the first piston disc 207 is slidably connected to the first sliding chamber B. The second push rod includes a second piston disc 212 and a second rod body 211 connected together. The end of the second rod body 211 away from the second piston disc 212 is connected to the second gripper 210. The second rod body 211 is slidably connected to the clamping body 201, and the second piston disc 212 is slidably connected to the second sliding chamber C. The first sliding chamber B and the second sliding chamber C are connected by a connecting chamber 204. The opening connecting the first sub-chamber 2041 to the first sliding chamber B and the second opening 208 are located on opposite sides of the effective stroke of the first push rod, i.e., the second opening 208 and the first opening 202 are separated by the first piston disc 207. The effective stroke of the first push rod refers to the stroke of the first piston disc 207 from its starting position to its ending position. The opening connecting the second sub-chamber 2042 to the second sliding chamber C and the third opening 213 are located on opposite sides of the effective stroke of the second push rod, i.e., the third opening 213 and the first opening 202 are separated by the second piston disc 212. The effective stroke of the second push rod refers to the stroke of the second piston disc 212 from its starting position to its ending position.

[0045] In one embodiment, the first opening 202 is disposed at the top of the clamping body 201, and the second opening 208 and the third opening 213 are both disposed at the bottom of the clamping body 201, such as... Figure 7 As shown. In other embodiments, the second opening 208 and the third opening 213 may also be provided on the front or rear side of the clamp body 201, where the front and rear sides refer to... Figure 7 In terms of placement, the first opening 202, the second opening 208, and the third opening 213 are respectively connected to the drive system.

[0046] The first opening 202, the second opening 208, and the third opening 213 are all connected to a fluid container. When the battery 3 needs to be clamped, fluid enters the communicating chamber 204 through the first opening 202, and then flows into the first sliding chamber B and the second sliding chamber C respectively. The fluid entering the first sliding chamber B pushes the left end of the first piston disc 207, and the fluid at the right end of the first piston disc 207 flows out through the second opening 208. At the same time, the fluid entering the second sliding chamber C pushes the right end of the second piston disc 212, and the fluid at the left end of the second piston disc 212 flows out through the third opening 213. Liquid enters through the first opening 202, and liquid exits through the second opening 208 and the third opening 213, controlling the first gripper 205 and the second gripper 210 to move closer together, clamping the battery 3. When the battery 3 is released, fluid enters through the second opening 208 and the third opening 213, and fluid exits through the first opening 202, controlling the first gripper 205 and the second gripper 210 to move away from each other, releasing the battery 3.

[0047] To ensure that the clamping forces of the first gripper 205 and the second gripper 210 are the same, the disk areas of the first piston disk 207 and the second piston disk 212 are the same. Furthermore, the cross-sectional areas of the first rod 206 and the second rod 211 are also the same.

[0048] To facilitate the sliding guidance of the first rod 206, a first sliding sleeve 209 is provided at the through hole connecting the first rod 206 and the clamping body 201. The first sliding sleeve 209 is fixedly connected to the clamping body 201; this connection can be an interference fit or a sealed weld. The first rod 206 is slidably connected within the axial through hole of the first sliding sleeve 209. Similarly, a second sliding sleeve 214 is provided at the through hole connecting the second rod 211 and the clamping body 201. The second sliding sleeve 214 is fixedly connected to the clamping body 201, and the connection method is the same as that of the first sliding sleeve 209, which will not be repeated here. The second rod 211 is slidably connected within the second sliding sleeve 214. Both the second sliding sleeve 214 and the first sliding sleeve 209 can be copper sleeves.

[0049] For ease of installation, the first sliding sleeve 209 includes a first limiting end plate and a first guide cylinder connected together, and the first rod body 206 is slidably connected in the first guide through hole of the first guide cylinder, such as... Figure 7 and Figure 8 As shown. Similarly, the second sliding sleeve 214 includes a second limiting end plate and a second guide cylinder connected together, and the second rod 211 is slidably connected in the second guide through hole of the second guide cylinder.

[0050] To improve sealing performance and prevent fluid leakage, a first sealing ring 215 is provided on the surface where the first sliding sleeve 209 connects to the first rod body 206. Figure 8As shown, the inner wall of the first guide through hole of the first sliding sleeve 209 is provided with a sealing ring groove, and the first sealing ring 215 is installed in the sealing ring groove. The first sealing ring 215 protrudes from the top of the sealing ring groove and contacts the first rod body 206. Similarly, a second sealing ring is provided on the surface where the second sliding sleeve 214 connects with the second rod body 211, and the second sealing ring is installed in the sealing ring groove of the inner wall of the second guide through hole.

[0051] The battery clamp 2 of this invention, under the action of the connecting chamber 204, ensures that the force applied to the battery 3 by the first gripper 205 and the second gripper 210 remains consistent. When the positions of the first gripper 205 and the second gripper 210 change, by setting the first sub-chamber 2041 and the second sub-chamber 2042 as symmetrical structures, making the volumes of the two chambers identical, it ensures that the volume reduction in the first sub-chamber 2041 is equal to the volume increase in the second sub-chamber 2042, thereby ensuring that the position changes of the two grippers are consistent, and the battery is always in a clamped state. The battery clamp 2 of this invention can eccentrically clamp and place the battery 3, reducing casing damage or serious safety risks, and lowering the requirements for the design and manufacturing precision of multi-channel robotic arms and trays.

[0052] When the battery clamp 2 of this invention is in operation, after the clamp moves to the designated position, the pressure medium (gas or liquid fluid medium) enters the communicating chamber 204 through the first opening 202. The first push rod and the second push rod move towards the battery 3, that is, open outwards. After contacting the battery 3 to be picked up or placed, the first opening 202, the second opening 208, and the third opening 213 are closed, keeping the volume of the pressure medium in the chamber constant. This ensures that the grippers remain in a clamped state, and the distance between the two grippers remains constant, thus completing the gripping action of the battery 3. When it is necessary to place the battery 3 into the tray, the first opening 202, the second opening 208, and the third opening 213 are opened. The first opening 202 discharges the medium, and the second opening 208 and the third opening 213 receive the medium, pushing the first push rod and the second push rod into their respective sliding chambers. The two grippers open, completing the placement action of the battery 3. When the battery deviation is too large, the offset can be compensated. After the two grippers eccentrically grip and lift the battery 3, under the action of the fluid in the communicating chamber 204, the gripped battery 3 can be automatically centered. When placed, the battery will be adjusted to the centered position.

[0053] This utility model also provides a robotic arm, including a support plate 1 and a battery clamp connected to the support plate 1, wherein the battery clamp is the aforementioned battery clamp 2. The support plate 1 is provided with a control valve 4 for controlling the liquid inlet of the sliding chamber. To improve the battery clamping efficiency, multiple battery clamps 2 are provided, arranged sequentially along the length of the support plate 1. To facilitate the movement of the clamping structure 203, a first opening 202 is connected to a first driving medium pipe of the driving system, a second opening 208 is connected to a second driving medium pipe of the driving system, and a third opening 213 is connected to a third driving medium pipe of the driving system. When only the first opening 202 is provided on the clamping body 201, and the second opening 208 and third opening 213 are not provided, the driving medium of the driving system is high-pressure gas or low-pressure gas, which can drive the clamping structure 203 to clamp or not. When the clamping body 201 is provided with the first opening 202, the second opening 208, and the third opening 213, the driving medium of the driving system can be atmospheric pressure gas or liquid, which can also drive the clamping structure 203 to clamp or not.

[0054] This utility model also provides a tray liner 5 for use with a battery clamp, placed on a tray. The battery clamp is the aforementioned battery clamp 2. The tray liner 5 includes a base plate 502 and a placement groove 503. The placement groove 503 is disposed on the base plate 502. The opening of the placement groove 503 is provided with an inclined surface 501 for guiding the placement of the battery 3. The inclined surface 501 is an annular surface surrounding the opening of the placement groove 503. Figure 9 and Figure 10 As shown. Figure 9 The diagram shows the battery 3 aligned with the placement slot 503. When the battery 3 is slightly to the left of the center of the placement slot 503, during downward movement, it experiences a horizontal force F1 from the inclined surface 501 at the top of the tray liner. This force is transmitted through the battery 3 to the grippers, causing the first and second push rods to slide under the force of the grippers, thus achieving horizontal movement of the battery 3 and avoiding "hard interference" with the placement slot 503, preventing damage to the battery casing. When the battery 3 is slightly to the right of the center of the placement slot 503, it experiences a horizontal force to the left from the inclined surface 501 during downward movement. This force is opposite to F1 and will not be elaborated further here.

[0055] In the description of this solution, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0056] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery clamp, characterized in that, include: The clamping body has an internal communicating chamber for fluid passage, and the communicating chamber has a first opening. The communicating chamber communicates with a sliding chamber disposed within the clamping body. The pushing mechanism includes a first pushing rod and a second pushing rod that are slidably connected to the clamp body; The clamping structure includes a first clamping part and a second clamping part, which are configured to clamp the battery in a relatively cooperative manner. One end of the first push rod is slidably connected to the sliding cavity, and the other end is connected to the first clamping part. One end of the second push rod is slidably connected to the sliding cavity, and the other end is connected to the second clamping part.

2. The battery clamp according to claim 1, characterized in that, The first clamping part includes a first clamping claw, and the second clamping part includes a second clamping claw. The first clamping claw and the second clamping claw are arc-shaped plates corresponding to the side curvature of the battery.

3. The battery clamp according to claim 1 or 2, characterized in that, The sliding cavity includes a first sliding chamber and a second sliding chamber, the first push rod is slidably connected to the first sliding chamber, and the second push rod is slidably connected to the second sliding chamber; One side of the first opening is a first sub-chamber communicating with the first sliding chamber, and the other side of the first opening is a second sub-chamber communicating with the second sliding chamber. The first sub-chamber and the second sub-chamber are symmetrically arranged with respect to the first opening.

4. The battery clamp according to claim 3, characterized in that, The clamping body is further provided with a second opening and a third opening, the second opening communicating with the first sliding chamber and the third opening communicating with the second sliding chamber; The opening connecting the first sub-chamber to the first sliding chamber and the second opening are respectively located on both sides of the effective stroke of the first push rod, and the opening connecting the second sub-chamber to the second sliding chamber and the third opening are respectively located on both sides of the effective stroke of the second push rod.

5. The battery clamp according to claim 4, characterized in that, The first opening is located at the top of the clamping body, and the second and third openings are located at the bottom of the clamping body. The first opening, the second opening, and the third opening are respectively connected to the drive system.

6. The battery clamp according to claim 1, characterized in that, The first push rod includes a first piston disc and a first rod body connected together. The end of the first rod body away from the first piston disc is connected to the first clamping part. The first rod body is slidably connected to the clamping part, and the first piston disc is slidably connected to the sliding cavity. The second push rod includes a second piston disc and a second rod body connected together. The end of the second rod body away from the second piston disc is connected to the second clamping part. The second rod body is slidably connected to the clamping part, and the second piston disc is slidably connected to the sliding cavity.

7. The battery clamp according to claim 6, characterized in that, The first piston disk and the second piston disk have the same disk area.

8. The battery clamp according to claim 6, characterized in that, A first sliding sleeve is provided at the position where the first rod body connects to the clamp body. The first sliding sleeve is fixedly connected to the clamp body, and the first rod body is slidably connected inside the first sliding sleeve. A second sliding sleeve is provided at the position where the second rod body connects to the clamp body. The second sliding sleeve is fixedly connected to the clamp body, and the second rod body is slidably connected inside the second sliding sleeve.

9. A robotic arm, comprising a support plate and a battery gripper connected to the support plate, characterized in that, The battery clamp is the battery clamp according to any one of claims 1-8, and multiple battery clamps are provided, which are arranged sequentially along the length direction of the support plate.

10. A tray liner for use with a battery clamp, placed on a tray, characterized in that, The battery clamp is the battery clamp according to any one of claims 1-8, the tray liner includes a base plate and a placement groove, the placement groove is disposed on the base plate, and the opening of the placement groove is provided with an inclined surface for guiding the placement of the battery.

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