Pressure maintaining mechanism

Abstract

The utility model discloses a pressure maintaining mechanism, and relates to the technical field of lithium battery production equipment.The pressure maintaining mechanism comprises a mounting chassis, a supporting frame and a pair of pressure maintaining parts arranged at the two ends of the supporting frame, the supporting frame is mounted on the mounting chassis, and at least one side, making contact with a battery module, of the supporting frame is made of a non-metal wear-resistant material; the pair of pressure maintaining parts is configured to be close to each other so as to extrude and maintain the pressure of the battery module on the support frame; each pressure maintaining part comprises a first sliding rail, a pushing and pressing plate and a first locking piece, the first sliding rails are fixedly installed at one end of the supporting frame, the pushing and pressing plates are installed on the first sliding rails in a sliding mode through first sliding blocks, and the first locking pieces are installed on the first sliding blocks. The external force application mechanism can extrude the battery module through the pushing plate, and after the battery module is extruded in place, the pushing plate is locked on the first sliding rail through the first locking piece, and at the moment, the external force application mechanism can be withdrawn, so that the pushing plate can maintain the state of extruding the battery module without the action of external pushing force.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery production equipment, and in particular to a pressure maintaining mechanism. Background Art

[0002] In the production process of battery modules, multiple battery cells need to be stacked first, and then end plates are attached to both ends of the stacked battery cells. Finally, steel strips are placed on the outside of the end plates to fix the end plates and the stacked battery cells.

[0003] Currently, when installing the steel strips, the stacked battery cells must first be pre-extruded from the outside of the end plates using an extrusion mechanism, and then the steel strips are installed manually or by machine on the outside of the extruded battery cells.

[0004] The existing extrusion mechanism is mainly composed of a pushing cylinder and a pushing plate. During the process of sleeve installation of the steel belt, an external force-applying mechanism (such as a cylinder) needs to continuously provide thrust to the pushing plate so that the pushing plate can maintain the extrusion of the battery module. Utility Model Content

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a pressure-maintaining mechanism to solve the problem in the prior art that the push plate needs to continuously follow up with an external force-applying mechanism when maintaining the pressure on the battery module.

[0006] The purpose of this application can be achieved through the following technical solutions:

[0007] The present application provides a pressure-maintaining mechanism, which includes a mounting chassis, a support frame, and a pair of pressure-maintaining portions provided at both ends of the support frame. The support frame is mounted on the mounting chassis, and at least one side of the support frame in contact with the battery module is made of a non-metallic wear-resistant material. The pair of pressure-maintaining portions are configured to be close to each other to squeeze and maintain pressure on the battery module on the support frame.

[0008] Each pressure maintaining portion includes a first slide rail, a push plate and a first locking member. The first slide rail is fixedly mounted on one end of the support frame. The push plate is slidably mounted on the first slide rail through a first slider. The first locking member is mounted on the first slider. The push plate is configured to squeeze the battery module on the support frame. The first locking member is configured to lock the push plate on the first slide rail after the battery module is squeezed into place.

[0009] The external force-applying mechanism squeezes the battery module through the push plate of the present application, and after squeezing into place, the push plate is locked to the first slide rail through the first locking member. At this time, the external force-applying mechanism can be withdrawn, so that the push plate can maintain the squeezing state of the battery module without the external thrust.

[0010] Optionally, each pressure maintaining portion further includes a first elastic return member, and the support frame and the first slider are elastically connected by the first elastic return member. The first elastic return member is configured to rebound after the first locking member is unlocked to drive the corresponding push plate away from the other push plate via the first slider.

[0011] The first elastic return member can be compressed and deformed when the external force-applying mechanism squeezes the battery module through the push plate of this application. When the first locking member releases the lock on the push plate, the first elastic return member can drive the corresponding push plate away from the other push plate by rebounding until it is reset, which is convenient and quick.

[0012] Optionally, a first air inlet hole for connecting to an external air source is provided on the mounting chassis, and a first air flow channel connected to the first air inlet hole is also provided in the mounting chassis. The first locking member adopts a pneumatic normally closed track lock, and the first locking member is connected to the first air flow channel through a first air pipe.

[0013] By setting up a first air flow channel in the mounting chassis, the external air source can be connected with the first air flow channel to centrally supply air to each first locking member, avoiding the need for each first locking member to be connected to the external air source one by one through the air pipe, thereby reducing the laying of air pipes.

[0014] Optionally, two groups of support frames are arranged side by side on the mounting chassis, and a pair of pressure maintaining parts are symmetrically provided at both ends of each group of support frames. A second slide rail perpendicular to the first slide rail is also provided on the mounting chassis. At least one group of support frames is slidably installed on the second slide rail through a second slider, and a second locking member is installed on the second slider. The second locking member is configured to lock the corresponding support frame on the second slide rail.

[0015] The present application can realize the simultaneous extrusion operation of two groups of battery modules by arranging two groups of support frames on the mounting chassis and a pair of pressure-maintaining parts correspondingly arranged at both ends of each group of support frames, and at least one group of support frames is slidably installed on the second slide rail through the second slider, so that the two groups of support frames can be relatively close to and away from each other, so as to ensure that there is sufficient spacing between the two groups of support frames to meet the simultaneous extrusion operation of the two groups of battery modules and the subsequent steel strip coating process, and then the two groups of battery modules are brought close to each other for integration.

[0016] Optionally, the pressure maintaining mechanism also includes a second elastic return member, and the support frame and the second slider are elastically connected by the second elastic return member. The second elastic return member is configured to rebound after the second locking member is unlocked to drive the corresponding support frame to approach another support frame via the second slider.

[0017] The second elastic return member can be compressed and deformed when the external force-applying mechanism squeezes the two groups of battery modules. At this time, the two groups of battery modules are close to each other and integrated together. When the second locking member is unlocked, the second elastic return member can drive the corresponding support frame away from the other support plate through rebound until it is reset, which is convenient and quick.

[0018] Optionally, a second air inlet hole for connecting to an external air source is provided on the mounting chassis, a second air flow channel connected to the second air inlet hole is provided in the mounting chassis, the second locking member adopts a pneumatic normally closed track lock, and the second locking member is connected to the second air flow channel through a second air pipe.

[0019] By setting up a second air flow channel in the mounting chassis, the external air source can be connected to the second air flow channel to centrally supply air to multiple second locking members, avoiding the multiple second locking members being connected to the external air source one by one through air pipes, thereby reducing the laying of air pipes.

[0020] Optionally, a positioning protrusion and a pressure rod are provided on the contact surface between the push plate and the end plate of the battery module. The first end of the pressure rod is rotatably connected to the push plate through a first torsion spring. The positioning protrusion is configured to adapt to the first positioning groove of the end plate to position the end plate. The pressure rod is configured to buckle the second end of the pressure rod into the second positioning groove of the end plate after the positioning protrusion matches the first positioning groove of the end plate to push up or press down the end plate.

[0021] By setting the positioning protrusion and the pressure rod, the positioning protrusion can cooperate with the first positioning groove on the end plate to position the end plate, and the pressure rod is buckled into the second positioning groove of the end plate through the second end to push up or press down the end plate, so that the end plate is relatively fixed on the pushing plate, which makes it convenient for the pushing plate to attach the end plate to the end face of the battery cell when squeezing the battery cell of the battery module.

[0022] Optionally, a roller is provided at the second end of the pressure rod, and the pressure rod contacts the end plate through the roller.

[0023] By setting rollers, the wear between the pressure rod and the end plate is reduced.

[0024] Optionally, the push plate includes a stacked front push plate and a rear push plate, the front push plate is fixedly mounted on the upper portion of the rear push plate close to the battery module, and the lower portion of the rear push plate close to the battery module is rotatably connected to a support block via a second torsion spring, and the support block is configured to allow the lower steel belt of the battery module to pass between the end plate of the extruded battery module and the support block and to support the lower steel belt when the lower steel belt is sleeved to a preset position.

[0025] By rotating the connecting support block at the lower part of the rear push plate close to the battery module side through the second torsion spring, the lower steel belt can pass between the support block and the end plate of the battery module, and move to the top of the support block to be supported by the support block, thereby avoiding the position of the lower steel belt being offset before the battery cells of the battery module tighten the lower steel belt.

[0026] After the lower steel belt is sleeved at the preset position, the support block can be used to support and position the lower steel belt, thereby preventing the position of the lower steel belt from shifting before the battery module tightens the lower steel belt.

[0027] Optionally, a plurality of third positioning grooves are provided on the bottom of the mounting chassis, and the third positioning grooves are configured to cooperate with positioning portions of an external device to limit the position of the pressure-maintaining mechanism on the external device;

[0028] and / or,

[0029] The pressure maintaining mechanism further includes a limiting member, which is located on the moving path of the push plate.

[0030] By setting multiple third positioning grooves at the bottom of the mounting chassis to facilitate positioning between the mounting chassis and other tooling, and by setting a limiter on the moving path of the push plate to limit the movement of the push plate when the first elastic reset member rebounds, the push plate can be accurately rebounded to its reset position each time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application will be further described below with reference to the accompanying drawings.

[0032] Figure 1 is a three-dimensional diagram of a pressure-maintaining mechanism in some embodiments of the present application;

[0033] Figure 2 is a side view of a pressure-maintaining mechanism in some embodiments of the present application;

[0034] Figure 3 is a three-dimensional diagram of a pressure-maintaining portion in some embodiments of the present application;

[0035] Figure 4 is a schematic structural diagram of the bottom of the push plate in some embodiments of the present application;

[0036] Figure 5 is a schematic diagram of the structure of installing the top of the chassis in some embodiments of the present application;

[0037] Figure 6 This is a schematic diagram of the structure of the bottom of the chassis installed in some embodiments of the present application.

[0038] Description of reference numerals:

[0039] 10. Mounting chassis; 11. Support frame; 111. Bottom plate; 112. Support rod; 12. Pressure-maintaining portion; 121. First slide rail; 122. Push plate; 1221. Front push plate; 1222. Rear push plate; 123. First locking member; 13. First slider; 14. First elastic return member; 15. Limiting member; 16. First air inlet; 17. Second slide rail; 18. Second slider; 19. Second elastic return member; 20. Positioning protrusion; 21. Pressure rod; 22. Roller; 23. Support block; 24. Third positioning groove; 100. Pressure-maintaining mechanism. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] See also Figure 1-3 As shown, in some embodiments, the present application provides a pressure-maintaining mechanism 100, which includes a mounting chassis 10, a support frame 11, and a pair of pressure-maintaining parts 12. The support frame 11 is mounted on the mounting chassis 10, and at least one side of the support frame 11 that contacts the battery module is made of a non-metallic wear-resistant material. A pair of pressure-maintaining parts 12 are respectively mounted on both ends of the support frame 11. Each pressure-maintaining part 12 includes a first slide rail 121, a push plate 122, and a first locking member 123. The first slide rail 121 is fixedly mounted on one end of the support frame 11, and the push plate 122 is slidably mounted on the first slide rail 121 through the first slider 13, and the first locking member 123 is mounted on the first slider 13.

[0042] The battery module is placed in the middle of the support frame 11 and located between the pair of push plates 122 of the pressure-maintaining portion 12. An external force-applying mechanism (not shown) can compress the battery module (not shown) via the push plates 122. Once the compression is in place, the first locking member 123 locks the first slider 13 to the first slide rail 121. Simultaneously, the external force-applying mechanism is withdrawn, allowing the push plates 122 to maintain their compression of the battery module even without external force.

[0043] Each pressure-maintaining portion 12 includes two first slide rails 121 spaced apart in a direction perpendicular to the length of the first slide rails 121. The bottom ends of the push plate 122 are slidably mounted on the two first slide rails 121 via two first sliders 13 to ensure the stability of the push plate 122.

[0044] See also Figure 2As shown, in some embodiments, the support frame 11 includes a base plate 111 and a plurality of support rods 112 arranged in the middle of the base plate 111. The base plate 111 is mounted on the mounting chassis 10. A pair of pressure-maintaining portions 12 are mounted on the base plate 111 and are respectively mounted at both ends of the base plate 111. The plurality of support rods 112 are arranged in parallel between the pair of pressure-maintaining portions 12. The stacked battery cells are placed on the support rods 112 and are squeezed by an external force-applying mechanism through a push plate 122. The end plates on the push plate 122 are attached to the two outermost battery cells to form a battery module. The lower steel belt of the battery module is initially located below the stacked battery cells and is sleeved on the outside of the support rods 112. When the battery module is squeezed, the lower steel belt moves upward from the bottom of the battery module and is sleeved on the end plates on the outside of the battery module.

[0045] Optionally, the support rods 112 are made of a non-metallic wear-resistant material, such as PEEK. When the stacked battery modules are facing downward, the support rods 112 will not electrically affect the battery modules, and are also compatible with battery modules with their poles facing upward. Of course, the support frame 11 can also be an integrated design, but at least the side in contact with the battery module is made of a non-metallic wear-resistant material, and this application does not impose any restrictions on the specific materials of the support frame 11 or the support rods 112.

[0046] See also Figure 3 As shown, in some embodiments, each pressure-maintaining portion 12 further includes a first elastic return member 14. The support frame 11 and the first slider 13 are elastically connected by the first elastic return member 14, so that after the first locking member 123 is unlocked, the first elastic return member 14 can rebound to drive the corresponding push plate 122 away from the other push plate 122 via the first slider 13 to achieve reset.

[0047] In one implementation, the first elastic return member 14 is located between the two first slide rails 121 and is arranged along the length direction of the first slide rail 121. One end of the first elastic return member 14 is connected to the support frame 11, and the other end is connected to the push plate 122. When the external force-applying mechanism squeezes the battery module through the push plate 122, the first elastic return member 14 is compressed and deformed; when the external force-applying mechanism is withdrawn and the first locking member 123 is unlocked, the first elastic return member 14 rebounds and drives the push plate 122 away from the other push plate 122 until it is reset, which is convenient and quick. Optionally, the first elastic return member 14 is a spring.

[0048] See also Figure 1 and Figure 4As shown, in some embodiments, the pressure-maintaining mechanism 100 further includes a limiter 15, which is fixedly mounted on the mounting chassis 10 and located in the movement path of the push plate 122. By providing the limiter 15 in the movement path of the push plate 122, the movement of the push plate 122 driven by the first elastic return member 14 when it rebounds is limited, so that the push plate 122 can be accurately rebounded to the preset position and reset each time.

[0049] See also Figure 1 As shown, in some embodiments, a first air inlet 16 for connecting to an external air source is provided on an outer surface of the mounting chassis 10. A first air flow channel (not shown) communicating with the first air inlet 16 is also provided within the mounting chassis 10. The first locking member 123 utilizes a pneumatic normally closed rail lock, and the first locking member 123 communicates with the first air flow channel via a first air pipe (not shown). The external air source is connected to the first air inlet 16, allowing high-pressure gas from the external air source to flow through the first air flow channel and the first air pipe to supply the first locking member 123, ensuring that the first locking member 123 is properly unlocked.

[0050] See also Figure 1 、 Figure 2 and Figure 5 As shown, in some embodiments, two groups of support frames 11 are arranged side by side on the mounting chassis 10, and a pair of pressure-maintaining portions 12 are symmetrically provided at both ends of each group of support frames 11. A second slide rail 17 perpendicular to the first slide rail 121 is provided on the top of the mounting chassis 10. At least one group of support frames 11 is slidably mounted on the second slide rail 17 via a second slider 18, so that the two groups of support frames 11 can move closer or farther away from each other along the second slide rail 17. A second locking member (not shown) is mounted on the second slider 18 so that after the two groups of support frames 11 move away from each other to a set distance, the second locking member locks the corresponding support frame 11 on the second slide rail 17 to ensure that there is sufficient distance between the two groups of support frames 11 to meet the simultaneous extrusion operation and subsequent steel stripping process of the two groups of battery modules, and then the two groups of battery modules are brought close together for integration.

[0051] In one implementation, both sets of support frames 11 are slidably mounted on the second slide rail 17 via the second slider 18. Each set of support frames 11 is matched with at least one second locking member, and each second locking member is mounted on one of the second sliders 18 at the bottom of the corresponding support frame 11.

[0052] In one implementation, multiple second slide rails 17 are provided, and the multiple second slide rails 17 are arranged at intervals along the length direction of the support frame 11. A plurality of second sliders 18 that cooperate with the second slide rails 17 one by one are provided at the bottom of the support frame 11. The support frame 11 slides on the multiple second slide rails 17 through the multiple second sliders 18, thereby improving the stability of the movement of the support frame 11.

[0053] See also Figure 5 As shown, in some embodiments, the pressure-maintaining mechanism 100 further includes a second elastic return member 19, and the support frame 11 and the second slider 18 are elastically connected by the second elastic return member 19. When the pressure-maintaining mechanism 100 needs to simultaneously maintain pressure on two groups of battery modules, the second elastic return member 19 is in a relaxed state, and the two groups of battery modules are a certain distance apart. After the steel belt is sleeved on the outside of the battery module, an external force drives the two groups of support frames 11 to move closer to each other along the second slide rail 17 to compress the second elastic return member 19. At this time, the two groups of battery modules are relatively integrated into a whole. When the subsequent unloading device moves the whole composed of the two groups of battery modules away from the pressure-maintaining mechanism 100, the second locking member is unlocked, causing the second elastic return member 19 to rebound, thereby causing the two groups of support frames 11 to move away from each other until they are reset. This is convenient for receiving the next group of stacked battery cells. Optionally, the second elastic return member 19 is a spring.

[0054] In some embodiments, a second air inlet (not shown) for connecting to an external air source (not shown) is provided on the other outer side of the mounting chassis 10. A second air flow channel (not shown) communicating with the second air inlet is also provided within the mounting chassis 10. The second locking member utilizes a pneumatic normally closed rail lock, which is connected to the second air flow channel via a second air pipe (not shown). The external air source, connected to the second air inlet, allows high-pressure gas from the external air source to flow sequentially through the second air flow channel and the second air pipe to the second locking member, ensuring proper unlocking of the second locking member.

[0055] See also Figure 3 As shown, in some embodiments, a positioning protrusion 20 and a pressure rod 21 are provided on the contact surface between the push plate 122 and the end plate (not shown) of the battery module. The positioning protrusion 20 is fixedly arranged in the middle of the contact surface, and two pressure rods 21 are provided. The two pressure rods 21 are symmetrically arranged on both sides below the positioning protrusion 20, and the first end of each pressure rod 21 is rotatably connected to the push plate 122 via a first torsion spring. The end plate is provided with a first positioning groove that matches the positioning protrusion 20 and a second positioning groove that matches the pressure rod 21 one-to-one. Before the end plate is attached to the ends of the battery cell of the battery module, it is first installed on the push plate 122, so that the positioning protrusion 20 is inserted into the first positioning groove, and the pressure rod 21 uses the elastic force of the first torsion spring to buckle against the top or bottom of the second positioning groove to push the end plate up or down, so that the end plate is tightly buckled on the positioning protrusion 20, and then the end plate is installed on the push plate 122, so that the push plate 122 squeezes the battery cell of the battery module while attaching the end plate to the end face of the battery cell. Of course, the position of the positioning protrusion 20 and the pressure rod 21 can be adaptively adjusted according to the position of the first positioning groove and the second positioning groove on the end plate, and the relative position of the positioning protrusion 20 and the pressure rod 21 on the push plate 122 is not further limited here.

[0056] In some embodiments, a roller 22 is provided on the second end of each pressure rod 21 , so that the pressure rod 21 contacts the end plate through the roller 22 , thereby reducing wear between the pressure rod 21 and the end plate.

[0057] In some embodiments, the push plate 122 includes a stacked front push plate 1221 and a rear push plate 1222, the front push plate 1221 is fixedly mounted on the upper portion of the rear push plate 1222 close to the battery module side, the rear push plate 1222 is arranged on the lower portion of the rear push plate 1222 close to the battery module side, and the rear push plate 1222 is rotatably connected to a support block 23 through a second torsion spring, and two support blocks 23 are symmetrically arranged along the central axis of the rear push plate 1222.

[0058] The pushing plate 122 squeezes the battery module through the front pushing plate 1221, and after squeezing into place, the lower steel belt mounted on the two support rods 112 can move upward through between the support block 23 and the end plate of the battery module, and move to the top of the support block 23 to be supported by the support block 23, thereby preventing the battery cells of the battery module from being offset in position before the lower steel belt is tightened, that is, the lower steel belt is inevitably falling.

[0059] See also Figure 6 As shown, in some embodiments, a plurality of third positioning grooves 24 are provided at the bottom of the mounting chassis 10, and the mounting chassis 10 can be accurately positioned on other tooling through the third positioning grooves 24, so as to position the mounting chassis 10 and other tooling.

[0060] The above is a detailed description of an embodiment of the present application. However, the content is only a preferred embodiment of the present application and cannot be considered to limit the scope of implementation of the present application. All equivalent changes and improvements made within the scope of the present application should still fall within the scope of the patent application.

[0061] It should be noted that the terms "first", "second" and similar terms used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. The descriptions of the directions of "left", "right", "left side", "right side", "upper", "lower", "top", "bottom" and so on in this application are all defined based on the relationship between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. In the description of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] In the description of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

Claims

1. A pressure maintaining mechanism, characterized in that: The pressure-maintaining mechanism includes a mounting chassis, a support frame, and a pair of pressure-maintaining portions provided at both ends of the support frame. The support frame is mounted on the mounting chassis, and at least one side of the support frame in contact with the battery module is made of a non-metallic wear-resistant material. The pair of pressure-maintaining portions are configured to be close to each other to squeeze and maintain the pressure on the battery module on the support frame. Each of the pressure-maintaining parts includes a first slide rail, a push plate and a first locking member. The first slide rail is fixedly mounted on one end of the support frame. The push plate is slidably mounted on the first slide rail through a first slider. The first locking member is mounted on the first slider. The push plate is configured to squeeze the battery module on the support frame. The first locking member is configured to lock the push plate on the first slide rail after the battery module is squeezed into place.

2. The pressure maintaining mechanism according to claim 1, characterized in that: Each of the pressure-maintaining parts also includes a first elastic return member, and the support frame and the first slider are elastically connected by the first elastic return member. The first elastic return member is configured to rebound after the first locking member is unlocked to drive the corresponding push plate away from the other push plate through the first slider.

3. The pressure maintaining mechanism according to claim 1, characterized in that: The mounting chassis is provided with a first air inlet hole for connecting to an external air source, and the mounting chassis is also provided with a first air flow channel connected to the first air inlet hole. The first locking member adopts a pneumatic normally closed track lock, and the first locking member is connected to the first air flow channel through a first air pipe.

4. The pressure maintaining mechanism according to claim 3, characterized in that: Two groups of support frames are arranged in parallel on the mounting chassis, and a pair of pressure maintaining parts are symmetrically provided at both ends of each group of support frames. A second slide rail perpendicular to the first slide rail is also provided on the mounting chassis, and at least one group of support frames is slidably installed on the second slide rail through a second slider, and a second locking member is installed on the second slider, and the second locking member is configured to lock the corresponding support frame on the second slide rail.

5. The pressure maintaining mechanism according to claim 4, characterized in that: The pressure maintaining mechanism also includes a second elastic return member, and the support frame and the second slider are elastically connected by the second elastic return member. The second elastic return member is configured to rebound after the second locking member is unlocked to drive the corresponding support frame to approach the other support frame via the second slider.

6. The pressure maintaining mechanism according to claim 4, characterized in that: The mounting chassis is also provided with a second air inlet hole for connecting to an external air source, and a second air flow channel connected to the second air inlet hole is provided in the mounting chassis. The second locking member adopts a pneumatic normally closed track lock, and the second locking member is connected to the second air flow channel through a second air pipe.

7. The pressure maintaining mechanism according to claim 1, characterized in that: A positioning protrusion and a pressure rod are provided on the contact surface between the push plate and the end plate of the battery module. The first end of the pressure rod is rotatably connected to the push plate through a first torsion spring. The positioning protrusion is configured to adapt to the first positioning groove of the end plate to position the end plate. The pressure rod is configured so that after the positioning protrusion matches the first positioning groove of the end plate, the second end of the pressure rod is buckled in the second positioning groove of the end plate to push up or press down the end plate.

8. The pressure maintaining mechanism according to claim 7, characterized in that: A roller is provided at the second end of the pressure rod, and the pressure rod contacts the end plate through the roller.

9. The pressure maintaining mechanism according to claim 1, characterized in that: The push plate includes a stacked front push plate and a rear push plate, the front push plate is fixedly mounted on the upper portion of the rear push plate close to the battery module, and the lower portion of the rear push plate close to the battery module is rotatably connected to a support block via a second torsion spring, and the support block is configured to allow the lower steel belt of the battery module to pass between the end plate of the extruded battery module and the support block and to support the lower steel belt when the lower steel belt is sleeved to a preset position.

10. The pressure maintaining mechanism according to claim 1, characterized in that: A plurality of third positioning grooves are provided at the bottom of the mounting chassis, and the third positioning grooves are configured to cooperate with the positioning parts of the external device to limit the position of the pressure maintaining mechanism on the external device; and / or, The pressure maintaining mechanism further includes a limiting member, and the limiting member is located on the moving path of the pushing plate.

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