Vanadium redox flow battery stack module unit and rapid modular stacking method

Abstract

The invention relates to the technical field of battery stacks, and discloses a vanadium redox flow battery stack module unit and a rapid modular stacking method.The vanadium redox flow battery stack module unit comprises a placement plate, the upper surface of the placement plate is provided with a battery body, and a groove is formed in the placement plate; the sealing protection assembly is arranged on the placement plate, is connected with the battery body and is used for further sealing protection of the connection part of the battery body; the limiting assembly is arranged on the placing plate and is used for limiting the position of the battery body; and the auxiliary assembly is arranged on the placing plate and is used for further limiting the battery body and ensuring the position accuracy of the battery in the assembling process at the same time. Through cooperation of internal structures of the sealing protection assembly, the connection part of the battery body is further sealed after being wrapped and sealed, dust is prevented from being accumulated on the battery, and the connection part is effectively prevented from being damaged by corrosive gas or liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of battery stacks, and in particular to a vanadium liquid flow battery stack module unit and a rapid modular stacking method. Background Art

[0002] Vanadium battery, whose full name is all-vanadium liquid flow battery, is a redox battery in which the active material is in a circulating liquid state. Vanadium liquid flow battery is a rechargeable liquid flow battery that uses the redox reaction of vanadium ions of different valence states in the electrolyte to store and release electrical energy. The battery consists of two liquid storage tanks, an electrolytic cell and multiple sets of electrodes. The electrolyte circulates through a pump, driving the vanadium ions to undergo electrochemical reactions between the electrodes, thereby realizing the charging and discharging process. Vanadium liquid flow battery has the advantages of long life, fast response, deep discharge, etc. due to its independent energy and power regulation capabilities. It is suitable for large-scale energy storage scenarios, such as renewable energy grid connection, grid frequency modulation, and peak shaving and valley filling. After more than 20 years of research and development, vanadium battery technology has become mature, with the increasing application of all-vanadium liquid flow battery stacks.

[0003] In complex environments, dust can easily enter the interior through the gaps in the joints and accumulate at the battery connection points, affecting the contact resistance of the connection, which in turn leads to a decrease in the transmission performance between battery modules. In humid environments, the connection points are easily invaded by corrosive gases or liquids, causing corrosion of the contact materials, resulting in poor contact or even failure. The lack of a connection protection device with a simple structure and sealing effect makes it difficult to cope with corrosion problems in complex environments.

[0004] Currently, when a battery stack is in use, it is directly placed on a work surface without a special installation and fixing device for the battery stack, which causes the battery stack to shake easily or fall from the work surface during use, making it inconvenient for workers to use. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a vanadium liquid flow battery stack module unit and a rapid modular stacking method, which solves the problem that the battery stack lacks a connection protection device with a simple structure and a good sealing effect, and is difficult to cope with the corrosion problem in complex environments.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a vanadium liquid flow battery stack module unit, comprising: a placement plate, a battery body is arranged on the upper surface of which, a groove is opened inside the placement plate; a sealing protection component, which is arranged on the placement plate and connected to the battery body, and is used to further seal and protect the connection of the battery body; a limiting component, which is arranged on the placement plate, and is used to limit the position of the battery body; an auxiliary component, which is arranged on the placement plate, and is used to further limit the battery body while ensuring the position accuracy of the battery during the assembly process; the sealing protection component includes a sliding block, the outer wall of the sliding block slides inside the groove, a fixed frame is fixed on the top of the sliding block, the outer wall of the fixed frame is in contact with the battery body, and two sealing plates symmetrically slide inside the fixed frame.

[0007] Preferably, an arc plate 1 is fixed to the outer wall of the fixing frame, an arc plate 2 is fixed to the outer wall of the fixing frame, the outer wall of the arc plate 1 is arranged inside the arc plate 2, and a rubber pad is fixed inside the arc plate 1.

[0008] Preferably, a telescopic rod is fixed to the outer wall of the arc plate one, the outer wall of the telescopic rod slides inside the arc plate two, a rubber block is fixed to the end of the telescopic rod, and a spring is sleeved on the outer wall of the telescopic rod, one end of the spring is fixed to the outer wall of the arc plate one, and the other end of the spring is fixed to the outer wall of the rubber block.

[0009] Preferably, the limit assembly includes a knob, which is arranged on the placement plate, the outer wall of the knob is in contact with the outer wall of the battery body, the internal thread of the knob is connected with a bolt 1, the outer wall of the bolt 1 is passed through the interior of the placement plate, and a handle is provided on the top of the bolt 1, and the bolt 1 can be quickly disassembled by turning the handle.

[0010] Preferably, the auxiliary component includes a fixing seat, which is arranged on the placement plate, and the internal thread of the fixing seat is connected with bolt 2, and the outer wall of bolt 2 is penetrated into the interior of the placement plate.

[0011] Preferably, a movable plate slides inside the fixed seat, a sliding groove is opened inside the fixed seat, the bottom end of the movable plate slides inside the sliding groove, a limiting plate is fixed at the top of the movable plate, and the lower surface of the limiting plate slides on the top of the battery body.

[0012] The rapid modular stacking method comprises the following steps:

[0013] Install multiple placement plates in the predetermined positions in sequence, ensure that the grooves between the placement plates are aligned, and adjust the horizontal position of the placement plates for subsequent modular assembly; install the battery bodies one by one on the upper surface of the placement plates, ensure that the position of the battery bodies is aligned with the grooves of the placement plates, and realize rapid positioning of the batteries through preliminary limiting; install the sealing protection assembly, insert the sliding block into the groove, realize modular positioning of the sealing protection assembly through sliding connection, adjust the fitting position of the fixing frame and the battery body, and slide the two sealing plates at the same time to complete the sealing of the connection; install the limiting assembly, screw the knob into each placement plate one by one, fix the limiting assembly to the battery body with bolt one, and use the handle to adjust the tightness of the limiting assembly to complete the modular fixation of the battery body; install the auxiliary assembly, fix the fixing seat on each placement plate, ensure that the moving plate matches the sliding groove by adjusting bolt two, and adjust the lower surface of the limiting plate to fit the outer wall of the battery body; check the installation of all modules in sequence, ensure that the sealing protection assembly, limiting assembly and auxiliary assembly are firmly connected according to the design requirements, and confirm that the battery body achieves modular alignment and fixing effect after assembly, to provide support for subsequent system operation.

[0014] Preferably, by adjusting the angle and tightening degree of the knob, it is ensured that bolt 1 fits tightly against the battery body, thereby achieving stable positioning of the battery body and facilitating subsequent rapid disassembly and maintenance.

[0015] Preferably, the position of the movable plate is freely adjusted in the sliding groove inside the fixing seat, so that the lower surface of the limiting plate can fit the outer wall of the battery body, thereby ensuring the stability of the battery operation.

[0016] The present invention provides a vanadium liquid flow battery stack module unit and a rapid modular stacking method, which has the following beneficial effects:

[0017] 1. The present invention achieves further sealing after wrapping and sealing the connection of the battery body through the coordination between the internal structures of the sealing protection component, while preventing dust from accumulating on the battery, effectively avoiding the connection parts from being invaded by corrosive gases or liquids, causing corrosion of contact materials, and further enhancing the protection performance of the battery body, improving the stability of equipment operation, and solving the problem of battery failure risk caused by exposure of connection parts due to incomplete wrapping and sealing of connection parts in complex environments.

[0018] 2. The present invention achieves the goal of limiting and fixing the battery body while ensuring the position accuracy of the battery during the assembly process through the cooperation between the auxiliary components and the limiting components, effectively reducing the shaking of the battery during assembly, and solving the problems of poor contact of the battery module due to positioning errors in the assembly process, uneven force on the connecting parts, and loose parts due to vibration. At the same time, it reduces the mechanical stress concentration of the battery assembly, avoids scratches on the outer wall and surface damage caused by shaking, further improves the stacking accuracy and the stability of the overall structure, and lays a foundation for the long-term reliable operation of the subsequent system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of the present invention;

[0020] Figure 2 It is a schematic diagram of the battery body structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the fixing frame of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the fixing frame part of the present invention;

[0023] Figure 5 It is a partial structural schematic diagram of the limiting plate of the present invention.

[0024] Among them, 1. placement plate; 2. battery body; 3. sealing protection component; 301. fixed frame; 302. arc plate 1; 303. arc plate 2; 304. sealing plate; 305. telescopic rod; 306. rubber block; 307. spring; 308. sliding block; 309. rubber pad; 4. limit assembly; 401. knob; 402. bolt 1; 403. handle; 5. auxiliary component; 501. fixed seat; 502. bolt 2; 503. sliding groove; 504. moving plate; 505. limit plate; 6. groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please see attached Figure 1 - Attachment Figure 4The embodiment of the present invention provides a vanadium liquid flow battery stack module unit, including: a placement plate 1, a battery body 2 is arranged on the upper surface of which, and a groove 6 is opened inside the placement plate 1; a sealing protection component 3, which is arranged on the placement plate 1 and connected to the battery body 2, and is used to further seal and protect the connection of the battery body 2; a limiting component 4, which is arranged on the placement plate 1, and is used to limit the position of the battery body 2; an auxiliary component 5, which is arranged on the placement plate 1, and is used to further limit the battery body 2 while ensuring the position accuracy of the battery during the assembly process; the sealing protection component 3 includes a sliding block 308, the outer wall of the sliding block 308 slides inside the groove 6, and the top of the sliding block 308 is fixed with a fixing frame 301, and the fixing The outer wall of the frame 301 fits with the battery body 2, and two sealing plates 304 are symmetrically slid inside the fixed frame 301. An arc plate 1 302 is fixed to the outer wall of the fixed frame 301, and an arc plate 2 303 is fixed to the outer wall of the fixed frame 301. The outer wall of the arc plate 1 302 is arranged inside the arc plate 2 303, and a rubber pad 309 is fixed inside the arc plate 1 302. A telescopic rod 305 is fixed to the outer wall of the arc plate 1 302, and the outer wall of the telescopic rod 305 slides inside the arc plate 2 303. A rubber block 306 is fixed to the end of the telescopic rod 305, and a spring 307 is sleeved on the outer wall of the telescopic rod 305, one end of the spring 307 is fixed to the outer wall of the arc plate 1 302, and the other end of the spring 307 is fixed to the outer wall of the rubber block 306.

[0027] Specifically, the further sealing protection component 3 realizes flexible installation and disassembly through the design of the sliding block 308. The outer wall of the sliding block 308 slides inside the groove 6 to ensure the stable connection between the component and the placement plate 1, and at the same time provides a certain displacement adjustment capability to adapt to different battery installation requirements. The top of the sliding block 308 is fixed with a fixed frame 301, and the outer wall of the fixed frame 301 fits with the battery body 2 to ensure the sealing effect of the component and the battery body 2. The internal sliding design of the fixed frame 301 is provided with two symmetrical sealing plates 304. Through the flexible sliding adjustment of the sealing plates 304, the outer wall of the fixed frame 301 is also fixed with an arc plate 1 302 and an arc plate 2 303. The outer wall design of the arc plate 1 302 forms a multi-layer protection structure inside the arc plate 2 303, which not only improves the physical strength of the further sealing protection, but also improves the sealing performance of the battery through the arc plate 1 302. The rubber pad 309 provided at the bottom realizes flexible fitting, reducing the possible damage to the outer wall of the battery caused by hard contact. At the same time, a telescopic rod 305 is fixed to the outer wall of the arc plate 1 302. The outer wall of the telescopic rod 305 slides inside the arc plate 2 303 and is automatically retracted by the action of a spring 307. One end of the spring 307 is fixed to the outer wall of the arc plate 1 302, and the other end is fixed to the outer wall of the rubber block 306 at the end of the telescopic rod 305. The rubber block 306 applies moderate pressure to the outer wall of the battery body 2 under the action of the spring 307, which not only enhances the sealing, but also plays a buffering and protective role. This design effectively solves the problem of sealing failure caused by vibration, dust intrusion and external force impact on the electric fusion connection under complex environments. At the same time, the damage to the outer wall of the battery body 2 caused by mechanical stress is reduced through elastic buffering, thereby improving the adaptability of the component and the overall reliability of the battery system.

[0028] Please refer to the attached Figure 3 - Attachment Figure 5 The limit assembly 4 includes a knob 401, which is arranged on the placement plate 1, and the outer wall of the knob 401 fits the outer wall of the battery body 2. The internal thread of the knob 401 is connected with a bolt 402, and the outer wall of the bolt 402 is penetrated into the interior of the placement plate 1. A handle 403 is rotated at the top of the bolt 402, and the bolt 402 can be quickly disassembled by rotating the handle 403. The auxiliary assembly 5 includes a fixed seat 501, which is arranged on the placement plate 1, and the internal thread of the fixed seat 501 is connected with a bolt 502, and the outer wall of the bolt 502 is penetrated into the interior of the placement plate 1. A movable plate 504 slides inside the fixed seat 501, and a sliding groove 503 is opened inside the fixed seat 501. The bottom end of the movable plate 504 slides inside the sliding groove 503. A limit plate 505 is fixed to the top of the movable plate 504, and the lower surface of the limit plate 505 slides on the top of the battery body 2.

[0029] Specifically, the limit assembly 4 realizes the stable fixation and quick adjustment function of the battery body 2 through the design of the knob 401. The knob 401 is arranged on the placement plate 1, and its outer wall is tightly fitted with the outer wall of the battery body 2, providing a preliminary mechanical limit effect. The interior of the knob 401 is connected to the bolt 1 402 through a thread, and the outer wall of the bolt 1 402 passes through the interior of the placement plate 1, ensuring that the structure of the limit assembly 4 is firm and reliable. At the same time, the top of the bolt 1 402 is rotatably connected to the handle 403, and the bolt 1 402 can be easily adjusted or removed by rotating the handle 403. This design significantly simplifies the installation and maintenance process of the limit assembly 4, and improves the efficiency and convenience of modular battery stacking. The auxiliary assembly 5 provides stable The fixed support, the fixed seat 501 is arranged on the placement plate 1, and the bolt 2 502 is connected inside by a thread, and the outer wall of the bolt 2 502 also passes through the inside of the placement plate 1 to ensure its stability. The internal sliding design of the fixed seat 501 is a movable plate 504, and the movable plate 504 slides inside the sliding groove 503 of the fixed seat 501, and its flexibility can adapt to the different position requirements of the outer wall of the battery body 2. The top of the movable plate 504 is fixed with a limiting plate 505, and the limiting plate 505 is in sliding contact with the top of the battery body 2 through the lower surface. The combination design of this limiting component 4 and the auxiliary component 5 can accurately position and stably fix the battery body 2, thereby improving the overall operating efficiency of the battery equipment, extending the service life of the battery system and reducing maintenance costs.

[0030] Please see attached Figure 1 - Attachment Figure 5, an embodiment of the present invention provides a rapid modular stacking method, comprising the following steps: installing a plurality of placement plates 1 in a predetermined position in sequence, ensuring that the grooves 6 between the placement plates 1 are aligned, and adjusting the horizontal position of the placement plates 1 for subsequent modular assembly; installing the battery bodies 2 one by one on the upper surface of the placement plates 1, ensuring that the position of the battery bodies 2 is aligned with the grooves 6 of the placement plates 1, and realizing rapid positioning of the battery through preliminary limiting; installing the sealing protection component 3, inserting the sliding block 308 into the groove 6, realizing modular positioning of the sealing protection component 3 through sliding connection, and adjusting the fitting position of the fixing frame 301 and the battery body 2, and sliding the two sealing plates 304 at the same time to complete the sealing of the connection; installing the limiting component 4, and turning the knob 401 is screwed into each placement plate 1 one by one, and the limit component 4 is fixedly connected to the battery body 2 by bolt one 402, and the tightness of the limit component 4 is adjusted by handle 403 to complete the modular fixation of the battery body 2; the auxiliary component 5 is installed, and the fixing seat 501 is fixed on each placement plate 1, and the movable plate 504 is matched with the sliding groove 503 by adjusting bolt two 502, and the lower surface of the limit plate 505 is adjusted to make it fit with the outer wall of the battery body 2; the installation status of all modules is checked in turn to ensure that the sealing protection component 3, the limit component 4 and the auxiliary component 5 are firmly connected as required by the design, and to confirm that the battery body 2 achieves modular alignment and fixation after assembly, so as to provide support for the subsequent system operation.

[0031] By adjusting the angle and tightening degree of the knob 401, it is ensured that the bolt 1 402 is tightly fitted to the battery body 2, thereby achieving stable positioning of the battery body 2 and facilitating subsequent rapid disassembly and maintenance.

[0032] By freely adjusting the position of the movable plate 504 in the sliding groove 503 inside the fixing seat 501, the lower surface of the limiting plate 505 can fit the outer wall of the battery body 2 to ensure the stability of the battery operation.

[0033] Working principle: The plate 1 is placed to provide basic support for the battery body 2, and the groove 6 provides a sliding track for the sliding block 308. When the sliding block 308 slides into the groove 6, the fixed frame 301 at its top fits with the battery body 2, and the two sealing plates 304 in the fixed frame 301 can slide symmetrically. The sealing of the connection of the battery body 2 is achieved by adjusting the position, further preventing external dust from entering and protecting the connection part. The arc plate 1 302 and the arc plate 2 303 on the outer wall of the fixed frame 301 provide multi-layer protection through the design of the inner and outer layers, further improving the sealing and mechanical stability of the outer wall of the battery body 2. The rubber pad 309 arranged inside the arc plate 1 302 can fit tightly against the outer wall of the battery body 2, playing a flexible buffering and protective role, and effectively avoiding surface damage caused by mechanical contact. At the same time, the outer wall of the arc plate 1 302 is installed with a telescopic rod 305. Under the elastic action of the spring 307, the telescopic rod 305 can be freely extended and retracted, and the rubber block 30 fixed at its end 6 By applying appropriate pressure, the protection performance of the outer wall of the battery body 2 is further enhanced, the reliability and durability of the protection effect are ensured, and at the same time, additional support and buffer are provided for the structural stability of the battery body 2. The limit component 4 is adjusted by the knob 401, and its threaded bolt 1 402 is inserted into the inside of the placement plate 1 and is rotated and adjusted by the handle 403 at the top, so as to realize the rapid fixation and limit of the position of the battery body 2. The auxiliary component 5 provides support through the fixed seat 501, and the bolt 2 502 adjusts the movable plate 504 inside the fixed seat 501. The movable plate 504 slides in the sliding groove 503 and scrapes and cleans the outer wall of the battery body 2 through the limit plate 505 fixed at its top, and at the same time ensures that the lower surface of the limit plate 505 is in sliding contact with the top of the battery body 2, effectively reducing the shaking of the battery during assembly, and at the same time reducing the mechanical stress concentration phenomenon of the battery assembly, avoiding scratches on the outer wall and surface damage caused by shaking, and further improving the stacking accuracy and the stability of the overall structure.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vanadium liquid flow battery stack module unit, characterized in that: include: A placement plate (1), the upper surface of which is provided with a battery body (2), and a groove (6) is provided inside the placement plate (1); A sealing protection component (3) is arranged on the placement plate (1) and connected to the battery body (2), and is used to further seal and protect the connection of the battery body (2); A limiting assembly (4), which is arranged on the placement plate (1) and is used to limit the position of the battery body (2); An auxiliary component (5) is arranged on the placement plate (1) and is used to further limit the position of the battery body (2) while ensuring the position accuracy of the battery during the assembly process; The sealing protection component (3) comprises a sliding block (308), the outer wall of which slides inside the groove (6), a fixing frame (301) is fixed to the top of the sliding block (308), the outer wall of which fits the battery body (2), and two sealing plates (304) which are symmetrical with each other slide inside the fixing frame (301).

2. The vanadium liquid flow battery stack module unit according to claim 1, characterized in that: The outer wall of the fixed frame (301) is fixed with an arc-shaped plate 1 (302), the outer wall of the fixed frame (301) is fixed with an arc-shaped plate 2 (303), the outer wall of the arc-shaped plate 1 (302) is arranged inside the arc-shaped plate 2 (303), and the inside of the arc-shaped plate 1 (302) is fixed with a rubber pad (309).

3. The vanadium liquid flow battery stack module unit according to claim 2, characterized in that: A telescopic rod (305) is fixed to the outer wall of the arc-shaped plate one (302), and the outer wall of the telescopic rod (305) slides inside the arc-shaped plate two (303). A rubber block (306) is fixed to the end of the telescopic rod (305). A spring (307) is sleeved on the outer wall of the telescopic rod (305), and one end of the spring (307) is fixed to the outer wall of the arc-shaped plate one (302), and the other end of the spring (307) is fixed to the outer wall of the rubber block (306).

4. The vanadium liquid flow battery stack module unit according to claim 3, characterized in that: The limit assembly (4) comprises a knob (401), the knob (401) being arranged on the placement plate (1), the outer wall of the knob (401) being in contact with the outer wall of the battery body (2), the inner thread of the knob (401) being connected with a bolt (402), the outer wall of the bolt (402) being passed through the interior of the placement plate (1), the top end of the bolt (402) being provided with a handle (403), and the bolt (402) can be quickly disassembled by turning the handle (403).

5. The vanadium liquid flow battery stack module unit according to claim 1, characterized in that: The auxiliary component (5) comprises a fixing seat (501), wherein the fixing seat (501) is arranged on the placement plate (1), the internal thread of the fixing seat (501) is connected with a second bolt (502), and the outer wall of the second bolt (502) is penetrated into the interior of the placement plate (1).

6. The vanadium liquid flow battery stack module unit according to claim 5, characterized in that: A movable plate (504) slides inside the fixed seat (501), a sliding groove (503) is provided inside the fixed seat (501), the bottom end of the movable plate (504) slides inside the sliding groove (503), a limiting plate (505) is fixed at the top end of the movable plate (504), and the lower surface of the limiting plate (505) slides on the top end of the battery body (2).

7. A rapid modular stacking method, according to claim 1-6, characterized in that: The following steps are involved: Installing a plurality of placement plates (1) in sequence at predetermined positions, ensuring that the grooves (6) between the placement plates (1) are aligned, and adjusting the horizontal positions of the placement plates (1) for subsequent modular assembly; The battery bodies (2) are mounted one by one on the upper surface of the placement plate (1), ensuring that the position of the battery bodies (2) is aligned with the grooves (6) of the placement plate (1), and the battery is quickly positioned by preliminary limiting; Install the sealing protection component (3), insert the sliding block (308) into the groove (6), realize the modular positioning of the sealing protection component (3) through sliding connection, adjust the fitting position of the fixing frame (301) and the battery body (2), and slide the two sealing plates (304) at the same time to complete the sealing of the connection; Install the limit assembly (4), screw the knob (401) into each placement plate (1) one by one, fix the limit assembly (4) to the battery body (2) by bolt 1 (402), and use the handle (403) to adjust the tightness of the limit assembly (4) to complete the modular fixation of the battery body (2); Install the auxiliary assembly (5), fix the fixing seat (501) on each placement plate (1), ensure that the movable plate (504) matches the sliding groove (503) by adjusting the second bolt (502), and adjust the lower surface of the limiting plate (505) so that it fits the outer wall of the battery body (2); Check the installation of all modules in turn to ensure that the sealing protection component (3), the limit component (4) and the auxiliary component (5) are firmly connected according to the design requirements, and confirm that the battery body (2) achieves modular alignment and fixation after assembly to provide support for subsequent system operation.

8. The rapid modular stacking method according to claim 7, characterized in that: By adjusting the angle and tightening degree of the knob (401), it is ensured that the bolt 1 (402) is tightly fitted to the battery body (2), thereby achieving stable positioning of the battery body (2) and facilitating subsequent rapid disassembly and maintenance.

9. The rapid modular stacking method according to claim 7, characterized in that: By freely adjusting the position of the movable plate (504) in the sliding groove (503) inside the fixing seat (501), the lower surface of the limiting plate (505) can fit the outer wall of the battery body (2), thereby ensuring the stability of the battery operation.

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