Battery cell stacking assist device and stacking method

Abstract

The invention discloses a battery cell stacking assistor and a stacking method, the battery cell stacking assistor is used for assisting stacking of a plurality of battery cells in a first direction, and the assistor comprises a gland comprising a first surface used for abutting against the top surfaces of the battery cells in a second direction; the positioning plate is connected with the first surface and extends in the first direction to form a guide plate protruding relative to the gland, the positioning plate and the guide plate are used for abutting against the first side face of the battery cell in the third direction, and the first direction, the second direction and the third direction are perpendicular to one another in pairs. Compared with the prior art, the specification of the stacked core groups is not limited, and compatibility with various different core groups can be realized, so that the number of tools required to be prepared by a production line is reduced, and the equipment redundancy of the production line is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage equipment processing technology, and in particular to a cell stacking aid and stacking method. Background Technology

[0002] Currently, energy storage systems are widely used in scenarios such as power peak shaving, renewable energy grid connection, and backup power. The long-term stable operation of energy storage systems has a critical impact on their life-cycle economics. The geometrical integrity of battery modules within the cabinet or rack directly affects the uniformity of thermal management, stress transmission paths, and the effective coordination of safety components. As the system ages, the cells undergo slow dimensional evolution and cumulative expansion during repeated charging and discharging. If the geometrical straightness of the module is insufficient during the initial assembly stage, it is prone to overall bending or "S"-shaped deformation during service, thus affecting the stress distribution of connectors and the consistency of heat dissipation channels. Therefore, achieving and maintaining high straightness in the battery module manufacturing process is a crucial foundation for ensuring the long-term stable operation of energy storage systems.

[0003] To improve assembly consistency, existing processes typically employ stacking fixtures to stack and initially shape the battery cells. The common practice is to place the cells sequentially on the fixture's base plate, placing heat-insulating or buffering pads between adjacent cells. Side baffles in the fixture limit the cells' sides, achieving basic alignment. Once a predetermined number of cells are reached, the fixture's clamping or pressing mechanism applies pressure to the cell assembly to form the required shape and contact configuration for the battery module. This process enables basic dimensional control and seamless process integration in mass production.

[0004] However, existing tooling solutions relying on fixed lateral baffles still have shortcomings in terms of adaptability and assembly accuracy. With the technological evolution in the energy storage field, product specifications are becoming increasingly diverse, with significant differences in module lengths for different string counts, such as from 1p4s to 1p26s. The baffles of stacking tooling are difficult to be compatible with different module lengths, requiring frequent tooling replacement or readjustment, which affects production cycle time and flexibility. How to balance alignment accuracy during assembly and tooling versatility under multi-specification production conditions has become a pressing technical problem to be solved in this field. Summary of the Invention

[0005] One objective of this application is to provide a cell stacking aid and a stacking method, which aims to solve the technical problem that the existing cell stacking tooling is difficult to adapt to various cell specifications.

[0006] To achieve the above objectives, in a first aspect, this application provides a battery cell stacking aid for assisting the stacking of multiple battery cells in a first direction. The aid includes: a pressure cap, including a first surface, which is used to abut against the top surface of the battery cell in a second direction; a positioning plate, which is connected to the first surface and extends in the first direction to form a guide plate that protrudes relative to the pressure cap. The positioning plate and the guide plate are used to abut against the first side surface of the battery cell in a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0007] During the process of stacking battery cells to form a core assembly in the first direction, the cap and the battery cell abut against each other in the second direction, and the positioning plate abuts against the battery cell in the third direction, so that the core assembly extends with good straightness in the first direction. The guide plate makes it relatively easy to align the newly assembled battery cells in the third direction. In the second direction, the operating table where the battery cells and core assembly are placed provides alignment, and in the first direction, it is aligned with the previously stacked core assembly. With the movement assistant, the battery cells can be stacked quickly with high straightness in the first direction.

[0008] The auxiliary device of this application relies on the relative positioning of the battery cell after it abuts against the guide plate and the previously stacked battery pack during use. That is, by simply repeating the above operation, a battery pack consisting of any number of battery cells can be stacked in the first direction. Compared with the prior art, this application does not limit the specifications of the stacked battery packs and is compatible with a variety of different battery packs, thereby reducing the number of tooling fixtures required for the production line and reducing equipment redundancy.

[0009] In conjunction with the first aspect, according to one embodiment of this application, the auxiliary device further includes a clamp plate connected to the first surface for abutting against the second side of the battery cell in a third-party direction.

[0010] In conjunction with the first aspect, according to one embodiment of this application, the clamping plate is located at the edge of the pressure cap away from the positioning plate, the side surface of the clamping plate facing the battery cell is parallel to the side surface of the positioning plate facing the battery cell, and the clamping plate, the pressure cap and the positioning plate together form a stacking groove for accommodating the battery cell.

[0011] In conjunction with the first aspect, according to one embodiment of this application, the distance between the clamping plate and the positioning plate is the dimension of the battery cell in a third direction; and / or the clamping plate is detachably connected to the pressure cap to adjust the distance between the clamping plate and the positioning plate.

[0012] In conjunction with the first aspect, according to one embodiment of this application, the edge of the clamping plate facing the battery cell away from the pressure cap is chamfered, and / or the edge of the positioning plate facing the battery cell away from the pressure cap is chamfered.

[0013] In conjunction with the first aspect, according to one embodiment of this application, an explosion-proof valve and / or a pole are protruding from the top surface of the battery cell, and a clearance groove for avoiding the explosion-proof valve and / or the pole is formed on the first surface.

[0014] In conjunction with the first aspect, according to one embodiment of this application, the clearance groove extends in a first direction.

[0015] In conjunction with the first aspect, according to one embodiment of this application, the aid further includes a handle, and the cover includes a second surface opposite to the first surface, with the handle disposed on the second surface.

[0016] In conjunction with the first aspect, according to one embodiment of this application, the dimension of the cover in the first direction is greater than the sum of the dimensions of the battery cells in the first direction; and / or, the dimension of the positioning plate in the first direction is greater than the sum of the dimensions of the battery cells in the first direction; and / or, the dimension of the guide plate in the first direction is greater than the dimension of the battery cells in the first direction.

[0017] Secondly, this application also provides a cell stacking method for stacking cells in a first direction using the auxiliary device of the above-described embodiment to form a cell assembly. The method includes repeatedly performing the following steps: moving / placing the auxiliary device such that a positioning plate abuts against the side of the cell in a third-party upward direction, and a pressure cap abuts against the top surface of the cell in a second direction; placing the cell such that the newly placed cell fits against the cell assembly in the first direction, and the side of the newly placed cell abuts against the guide plate in a third-party upward direction.

[0018] The beneficial effects of the second aspect described above can be referred to in the first aspect or any possible implementation of the first aspect, and will not be elaborated here. Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations.

[0019] Other advantages, objectives and features of this application will be partly apparent from the description below, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram illustrating an application scenario of the auxiliary device provided in the embodiments of this application; Figure 2 This is one of the overall structural schematic diagrams of the auxiliary device provided in the embodiments of this application; Figure 3 This is the second schematic diagram of the overall structure of the auxiliary device provided in the embodiments of this application; Figure 4 It is along Figure 2 A cross-sectional view of line AA in the middle.

[0022] Explanation of icon numbers: 10. Battery cell; 11. Explosion-proof valve; 12. Terminal post; 20. Pressure cap; 21. Leaving groove; 30. Positioning plate; 40. Guide plate; 50. Clamping plate; 60. Stacking groove; 70. Handle. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Energy storage systems have been widely used in scenarios such as power peak shaving, renewable energy grid connection, and backup power. Their long-term stable operation is crucial to their economic efficiency throughout their entire life cycle. The geometrical retention of battery modules in cabinets or racks affects the uniformity of thermal management, stress transmission, and the fit of safety protection components. As the system ages, the battery cells will slowly expand during repeated charging and discharging. If the initial straightness is insufficient, the module is prone to bending or "S"-shaped deformation during service, affecting the stress distribution of connectors and the consistency of heat dissipation channels.

[0025] To improve assembly consistency, existing production processes typically employ stacking fixtures for cell stacking and initial shaping: cells are placed sequentially on the fixture base plate, and once a predetermined number is reached, a pressing or squeezing mechanism applies pressure to the cell assembly, forming the required shape and contact state, thereby achieving basic dimensional control and process coordination in mass production. However, existing stacking fixtures have limitations in adaptability. Due to the diverse product specifications, the length of the cell assemblies varies significantly, making it difficult for the stacking fixtures to accommodate different cell lengths. Frequent fixture changes or adjustments are required, leading to reduced production efficiency and high equipment redundancy on the production line.

[0026] To address the aforementioned technical problems, in a first aspect, this application provides a cell 10 stacking aid for assisting the stacking of multiple cells 10 in a first direction. The aid includes: The pressure cap 20 includes a first surface, which is used to abut against the top surface of the battery cell 10 in a second direction; The positioning plate 30 is connected to the first surface and extends in the first direction to form a guide plate 40 that protrudes relative to the pressure cover 20. The positioning plate 30 and the guide plate 40 are used to abut against the first side of the battery cell 10 in the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0027] During the process of stacking the battery cells 10 in the first direction to form a core assembly, the pressure cap 20 abuts against the battery cells 10 in the second direction, and the positioning plate 30 abuts against the battery cells 10 in the third direction, so that the core assembly extends with good straightness in the first direction. The guide plate 40 makes it relatively easy to align the newly assembled battery cells 10 in the third direction. In the second direction, the operating table on which the battery cells 10 and the core assembly are placed provides alignment, and in the first direction, it is aligned with the previously stacked core assembly. By using the moving aid, the battery cells 10 can be stacked quickly with high straightness in the first direction.

[0028] During use, the positioning of the auxiliary device in this application relies on the relative positioning of the battery cell 10 after it abuts against the guide plate 40 and the previously stacked battery cells. That is, by repeating the above operation, a battery cell assembly consisting of any number of battery cells 10 can be stacked in the first direction. Compared with the prior art, this embodiment does not limit the specifications of the stacked battery cells and can be compatible with a variety of different battery cells, thereby reducing the number of tooling fixtures required for the production line and reducing equipment redundancy.

[0029] It should be understood that, in this application, except for the first direction representing the stacking direction of the battery cells 10 which is a vector, the second and third directions are both bidirectional extensions of the spatial straight lines where the illustrated directions are located.

[0030] This application requires that the third direction be perpendicular to the first direction, but this does not mean that the outer contour shape of the cell 10 must be a cuboid. The first direction is the stacking direction of the cells 10 in the core assembly. The two faces of the cell 10 in the first direction are defined as the large faces. The third direction must be perpendicular to the first side face, but the first direction is not necessarily orthogonal to the large faces. In general, the cross-section of the cell 10 on the plane formed by the first direction and the third direction (that is, the plane parallel to the assembly table) is rectangular. In this case, the first side face and the large face form a right angle, and the first direction is perpendicular to the large face. However, in some irregularly shaped battery designs, such as blade batteries with the first side face tilted, the cross-section of the cell 10 on the plane formed by the first direction and the third direction is a non-rectangular parallelogram, and the angle between the first side face and the large face is an acute angle. In this case, the first direction and the large face form an acute angle.

[0031] In conjunction with the first aspect, according to one embodiment of this application, the auxiliary device further includes a clamping plate 50 connected to the first surface for abutting against the second side of the battery cell 10 in a third-party direction.

[0032] The positioning plate 30 abuts against the first side of the battery cell 10 in the third direction, and the clamping plate 50 abuts against the second side of the battery cell 10 in the third direction. The positioning plate 30 and the clamping plate 50 clamp and position the battery cell 10 (i.e. the part of the stacked core group) from both sides of the battery cell 10, further avoiding inaccurate positioning caused by the tilt of the battery cell 10.

[0033] In conjunction with the first aspect, according to one embodiment of this application, the clamping plate 50 is located at the end edge of the pressure cover 20 away from the positioning plate 30, and the side surface of the clamping plate 50 facing the battery cell 10 is parallel to the side surface of the positioning plate 30 facing the battery cell 10. The clamping plate 50, the pressure cover 20 and the positioning plate 30 together form a stacking groove 60 for accommodating the battery cell 10.

[0034] In this embodiment, the clamping plate 50 is arranged on the edge of the pressure cover 20 away from the positioning plate 30, and the working surface of the clamping plate 50 is parallel to that of the positioning plate 30. This minimizes the size of the pressure cover 20 and reduces the outer contour size of the auxiliary device while ensuring the width of the stacking slot 60. This improves the spatial compatibility and avoidance with surrounding mechanisms of the production line (such as feeding track, transfer gripper, positioning fixture, fixture opening, etc.) and reduces the risk of size interference.

[0035] In conjunction with the first aspect, according to one embodiment of this application, the distance between the clamping plate 50 and the positioning plate 30 is the dimension of the battery cell 10 in a third direction; and / or the clamping plate 50 is detachably connected to the pressure cap 20 to adjust the distance between the clamping plate 50 and the positioning plate 30.

[0036] Normally, the first side and the second side of the battery cell 10 are parallel. In this embodiment, the surface of the clamping plate 50 facing the battery cell 10 is parallel to the surface of the positioning plate 30 facing the battery cell 10, and the distance between the clamping plate 50 and the positioning plate 30 is the dimension of the battery cell 10 in the third direction. That is, the dimension of the battery cell 10 in the third direction is the smallest and exactly equal to the distance between the clamping plate 50 and the positioning plate 30 when the positioning plate 30 is attached to the first side and the clamping plate 50 is attached to the second side. When the battery cell 10 has a tilting tendency, its dimension in the third direction will increase and be limited by the clamping plate 50 and the positioning plate 30. Therefore, for the technical solution where the distance between the clamping plate 50 and the positioning plate 30 is the dimension of the battery cell 10 in the third direction, when multiple battery cells 10 are inserted into the stacking slot 60, their stacking direction must extend along the first direction.

[0037] For the technical solution of detachable connection between clamping plate 50 and pressure cap 20, the distance between clamping plate 50 and positioning plate 30 can be adjusted by moving clamping plate 50, which can adapt to different cell widths 10 and further optimize the production line compatibility of the auxiliary device.

[0038] The specific adjustment method of the clamping plate 50 can be set by those skilled in the art according to the actual situation. For example, multiple slots are opened on the first surface. The distance between the different slots and the positioning plate 30 in the third direction is different. The clamping plate 50 is inserted into the slot to realize a detachable connection with the pressure cover 20. When the clamping plate 50 selects different slots, the distance between the clamping plate 50 and the positioning plate 30 is different.

[0039] Alternatively, in another embodiment, a groove extending in a third direction is provided on the first surface, and the clamping plate 50 is slidably connected to the pressure cover 20 through the groove, thereby adjusting the distance between the clamping plate 50 and the positioning plate 30.

[0040] In conjunction with the first aspect, according to one embodiment of this application, the edge of the clamping plate 50 facing the cell 10 away from the pressure cap 20 is chamfered, and / or the edge of the positioning plate 30 facing the cell 10 away from the pressure cap 20 is chamfered.

[0041] By providing a chamfer on the edge of the clamping plate 50 and / or positioning plate 30 facing the cell 10 and away from the pressure cap 20, a smooth introduction transition can be provided when the cell 10 is inserted in the second direction, reducing interference from the entry edge and local stress concentration, reducing jamming caused by slight angular deviations, and avoiding scratching and damage to the surface of the cell 10 or its accessories. Therefore, the technical solution of this embodiment improves assembly tolerance, shortens alignment time, stabilizes assembly cycle, and does not affect the three-sided reference positioning effect of the cell 10 within the stacking slot 60.

[0042] For example, setting a chamfer can be either a rounded corner or a flat corner.

[0043] In conjunction with the first aspect, according to one embodiment of this application, the top surface of the battery cell 10 is provided with an explosion-proof valve 11 and / or a pole post 12, and the first surface is provided with a clearance groove 21 to avoid the explosion-proof valve 11 and / or the pole post 12.

[0044] In this embodiment, by providing a clearance groove 21 on the side of the pressure cap 20 facing the battery cell 10 to avoid the explosion-proof valve 11 and / or the pole post 12, stable contact and positioning with the top surface of the battery cell 10 can be achieved without interfering with the functional structure of the top surface of the battery cell 10. This avoids attitude deviation or reference tilting caused by local contact, ensuring the positioning accuracy and guiding consistency of the battery cell 10, thereby improving assembly reliability and consistency.

[0045] In conjunction with the first aspect, according to one embodiment of this application, the clearance groove 21 extends in a first direction.

[0046] The clearance slot 21 extending in the first direction facilitates the movement of the auxiliary device when a new battery cell 10 is stacked. By simply sliding the auxiliary device in the first direction, the auxiliary device can be switched between different battery cell 10 stacking positions while maintaining the positioning of the core group in the second and third directions.

[0047] In conjunction with the first aspect, according to one embodiment of this application, the aid further includes a handle 70, and the cover 20 includes a second surface opposite to the first surface, with the handle 70 disposed on the second surface.

[0048] The handle 70 facilitates the operator's movement of the auxiliary device, especially when the size of the cover 20 is difficult to grip with one hand. The handle 70 allows the operator to move the auxiliary device with one hand while assembling and supporting the battery cell 10 with the other hand.

[0049] In conjunction with the first aspect, according to one embodiment of this application, the dimension of the pressure cap 20 in the first direction is greater than the sum of the dimensions of the battery cells 10 in the first direction; and / or, the dimension of the positioning plate 30 in the first direction is greater than the sum of the dimensions of the battery cells 10 in the first direction. If the pressure cap 20 or the positioning plate 30 is too short, the positioning reference will be unreliable. The above-mentioned dimension limitation ensures that more than one battery cell 10 serves as the positioning reference, making the positioning reference more accurate.

[0050] In conjunction with the first aspect, according to one embodiment of this application, the guide plate 40 is larger in size in the first direction than the cell 10 is in the first direction.

[0051] If the guide plate 40 is too short, the positioning area on the first side of the newly assembled battery cell 10 will be too small, making the battery cell 10 prone to skew. The aforementioned dimensional limitation ensures that the entire first side of the battery cell 10 serves as a positioning reference, resulting in more accurate positioning. Furthermore, it should be noted that in actual production, due to differences in cell manufacturing processes and product design, the cross-section of the battery cell on the plane parallel to the first side is not necessarily rectangular; its dimensions in the third direction may vary in width. When the positioning plate 30 abuts against the wider part of the battery cell, while the excessively short guide plate 40 only abuts against the narrower part, the core assembly will skew towards the side closer to the guide plate 40 in the third direction, affecting the positioning effect.

[0052] It should be understood that the above-mentioned size limitations in this application are only preferred embodiments. When the positioning accuracy requirement is low, or when the outer contour shape of the battery cell itself is a standard cuboid, even if the size of the guide plate 40 / cap 20 / positioning plate 30 does not meet the requirements of the above embodiments, the function of assisting in the positioning of the battery pack can still be achieved.

[0053] Secondly, this application also provides a cell stacking method for stacking cell 10 in a first direction using the auxiliary device of the above embodiment to form a cell group, the method including repeatedly performing the following steps: S1: Move / place the auxiliary device so that the positioning plate 30 abuts against the side of the battery cell 10 in the third direction and the pressure cover 20 abuts against the top surface of the battery cell 10 in the second direction. S2: Place the battery cell 10 so that the newly placed battery cell 10 is in contact with the core group in the first direction, and the side of the newly placed battery cell 10 abuts against the guide plate 40 in the third direction.

[0054] Since the cell stacking method 10 provided in the second aspect of this application uses the auxiliary device of the above embodiment, the stacking method also has the technical effects of the above auxiliary device. The beneficial effects of the second aspect can be referred to the first aspect or any possible implementation of the first aspect, which will not be elaborated here. Based on the implementations provided in the above aspects, this application can also make further combinations to provide more implementations.

[0055] Specifically, when the positioning plate 30 abuts against the side of the battery cell 10 in the third direction, and the pressure cover 20 abuts against the top surface of the battery cell 10 in the second direction, and the side of the newly placed battery cell 10 abuts against the guide plate 40 in the third direction, since the battery cell 10 and the core group must be placed on the operating table, the newly placed battery cell 10 is also limited in the second direction. The core group and the newly placed battery cell 10 only have a degree of freedom in the first direction. At this time, as long as the newly placed battery cell 10 and the core group are in contact in the first direction, the stacking of any number of battery cells 10 in the first direction can be achieved.

[0056] It should be understood that before performing the above stacking method, at least one battery cell 10 should be placed on the operating table as a basis for alignment. When performing step S1 for the first time, only the auxiliary device can be placed and not moved. When performing step S1 in subsequent times, the auxiliary device can be picked up and placed again, or the auxiliary device can be kept on top of the battery cell group and moved. Those skilled in the art can choose according to the specific structure of the battery cell 10 and the auxiliary device.

[0057] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0058] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0059] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0060] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the design concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A cell stacking aid for assisting the stacking of multiple cells in a first direction, characterized in that, The auxiliary device includes: The pressure cap includes a first surface, which is used to abut against the top surface of the battery cell in a second direction; A positioning plate is connected to the first surface and extends in the first direction to form a guide plate that protrudes relative to the pressure cap. The positioning plate and the guide plate are used to abut against the first side of the battery cell in a third direction. The first direction, the second direction and the third direction are perpendicular to each other.

2. The cell stacking aid according to claim 1, characterized in that, The auxiliary device also includes a clamping plate connected to the first surface, which is used to abut against the second side of the battery cell in a third-direction orientation.

3. The cell stacking aid according to claim 2, characterized in that, The clamping plate is located at the edge of the pressure cap away from the positioning plate. The side surface of the clamping plate facing the battery cell is parallel to the side surface of the positioning plate facing the battery cell. The clamping plate, the pressure cap, and the positioning plate together form a stacking groove for accommodating the battery cell.

4. The cell stacking aid according to claim 3, characterized in that, The distance between the clamping plate and the positioning plate is the dimension of the battery cell in the third direction; and / or The clamping plate is detachably connected to the pressure cap to adjust the distance between the clamping plate and the positioning plate.

5. The cell stacking aid according to claim 3, characterized in that, The clamping plate has a chamfer on the edge of the side facing the battery cell away from the pressure cap, and / or the positioning plate has a chamfer on the edge of the side facing the battery cell away from the pressure cap.

6. The cell stacking aid according to claim 1, characterized in that, The top surface of the battery cell is provided with an explosion-proof valve and / or a pole post, and a clearance groove is formed on the first surface to avoid the explosion-proof valve and / or pole post.

7. The cell stacking aid according to claim 6, characterized in that, The clearance groove extends in the first direction.

8. The cell stacking aid according to any one of claims 1-7, characterized in that, The aid also includes a handle, and the cover includes a second side opposite to the first side, with the handle disposed on the second side.

9. The cell stacking aid according to any one of claims 1-7, characterized in that, The dimension of the cover in the first direction is greater than the sum of the dimensions of the battery cell in the first direction; And / or, the dimension of the positioning plate in the first direction is greater than the sum of the dimensions of the battery cell in the first direction. And / or, the dimension of the guide plate in the first direction is greater than the dimension of the battery cell in the first direction.

10. A cell stacking method for stacking cells in a first direction to form a cell assembly using an auxiliary device according to any one of claims 1-9, characterized in that, The method includes repeatedly performing the following steps: Move / place the auxiliary device so that the positioning plate abuts against the side of the battery cell in the third direction, and the pressure cap abuts against the top surface of the battery cell in the second direction; The battery cell is placed such that the newly placed battery cell is in contact with the core assembly in a first direction, and the side of the newly placed battery cell abuts against the guide plate in a third direction.

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