Battery cell fixing device

Abstract

The utility model relates to a battery cell fixing device which comprises a base and a positioning assembly, and the base is used for bearing a battery cell; the positioning assembly is arranged on the base and forms a limiting space of the battery cell; the position of the positioning assembly on the base is adjustable. The limiting space is formed by the positioning assembly and the base, and the position of the positioning assembly relative to the base is adjustable so as to adjust the size of the limiting space, so that the battery cells with different sizes and specifications can be stacked and placed in the limiting space, and the applicability of the battery cell fixing device is improved; by arranging the limiting space in the positioning part, the positioning part can limit the multiple battery cells placed in the limiting space, so that the multiple battery cells can be kept stable during subsequent tab welding, the probability of position deviation of the tabs is reduced, and the welding precision and efficiency of the tabs are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cell fixing device. BACKGROUND

[0002] The tab is a metal conductor that leads the positive and negative electrodes out of the battery cell. The tabs of multiple battery cells are welded together to achieve series or parallel connection of the battery cells.

[0003] In the related art, the tab welding of the battery cell can be the welding of the tab monomers formed by the current collectors stacked on the battery cell, or the welding of the tabs on the battery cells during assembly.

[0004] However, regardless of the welding, different models and specifications of battery cells may have different sizes. The tab welding system in the related art is difficult to adapt to battery cells of different sizes, and different welding tools need to be replaced during welding to match battery cells of different shapes and sizes, greatly reducing the efficiency of tab welding and increasing labor costs and material costs. Moreover, the tab vibrates greatly during welding and the position may shift. When the shifted battery cell enters the cutting process, the tab may be cut too short and scrapped. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a battery cell fixing device to solve the above technical problems and to be applicable to battery cells of different models and specifications to improve the efficiency of tab welding.

[0006] In a first aspect, the present application provides a battery cell fixing device, which includes a base and a positioning assembly. The base is used to carry the battery cell. The positioning assembly is arranged on the base and forms a limiting space for the battery cell. The position of the positioning assembly on the base is adjustable.

[0007] The above-mentioned battery cell fixing device forms a limiting space through the positioning assembly and the base. The position of the positioning assembly relative to the base is adjustable to adjust the size of the limiting space. Therefore, battery cells of different sizes and specifications can be stacked and placed in the limiting space, improving the applicability of the battery cell fixing device. Moreover, the positioning assembly limits the multiple battery cells placed in the limiting space, so that the multiple battery cells can remain stable during subsequent tab welding, reducing the probability of tab position shift and improving the welding precision and efficiency of the tab.

[0008] In one embodiment, the size of the positioning assembly in the direction perpendicular to the plane of the base is adjustable.

[0009] In one embodiment, the positioning assembly includes at least two positioning members. The two positioning members form a limiting space and can resist two parallel sides of the battery cell.

[0010] In one of the embodiments, the base is provided with a mounting hole, and the positioning member is slidingly installed in the mounting hole through the fixing member.

[0011] In one of the embodiments, the positioning member comprises a first positioning part and a second positioning part, the first positioning part is arranged on the base, and the second positioning part is slidingly matched with the first positioning part in a direction perpendicular to the plane of the base; both the first positioning part and the second positioning part are capable of abutting against the battery cell.

[0012] In one of the embodiments, the positioning member further comprises a third positioning part, the third positioning part is arranged on the second positioning part and is capable of abutting against the top of the battery cell.

[0013] In one of the embodiments, the third positioning part is further capable of abutting against the sidewall of the battery cell.

[0014] In one of the embodiments, the third positioning part is hinged with the second positioning part and comprises a first state and a second state, the third positioning part abuts against the top of the battery cell when in the first state, and the third positioning part abuts against the sidewall of the battery cell when in the second state.

[0015] In one of the embodiments, two first positioning parts are arranged, and the second positioning part is arranged between the two first positioning parts and is slidingly matched with the first positioning parts.

[0016] In one of the embodiments, the second positioning part is arranged on the side of the first positioning part away from the limiting space and is slidingly matched with the first positioning part. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic view of the battery cell fixing device in one of the embodiments of the present application, wherein the third positioning part is in the first state.

[0018] Figure 2 FIG. 2 is a schematic view of the battery cell fixing device in one of the embodiments of the present application, wherein the third positioning part is in the second state.

[0019] Figure 3 FIG. 3 is a schematic view of the positioning member in one of the embodiments of the present application.

[0020] BRIEF DESCRIPTION OF DRAWINGS

[0021] 100, battery cell fixing device; 10, base; 11, mounting hole; 20, positioning member; 21, first positioning part; 22, second positioning part; 23, third positioning part; 30, limiting space; 40, fixing member; 200, battery cell. DETAILED DESCRIPTION

[0022] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different ways from what is described herein, and by one of ordinary skill in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0025] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0027] It should be noted that if an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be a mediating element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a mediating element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0028] Referring to Figure 1 and Figure 2 In some embodiments, the battery cell fixing device 100 is used to fix and align a plurality of battery cells 200 so as to facilitate subsequent welding of the tabs of the plurality of battery cells 200. It should be noted that the battery cell fixing device 100 of the present application can not only be applied to subsequent tab welding, but also can be applied to other scenarios where a plurality of battery cells 200 need to be stacked and fixed, such as moving the plurality of battery cells 200 after stacking.

[0029] The battery cell fixing device 100 includes a base 10 and a positioning assembly. The base 10 is used for mounting the positioning assembly and carrying a plurality of stacked battery cells 200. Feasibly, the base 10 is separately provided, so that the base 10 can be placed on different carrying planes, so that the battery cell fixing device 100 can be applied to different carrying platforms, improving the applicability of the battery cell fixing device 100, and facilitating the movement of the battery cell fixing device 100 as a whole to adapt to different application scenarios. In other embodiments, the carrying platform can be directly used as the base 10, and the positioning assembly can be directly connected to the carrying platform, such as directly using the welding workbench of the tab welding system as the base 10.

[0030] The positioning assembly is used to define the position of the plurality of battery cells 200 stacked on the base 10, so as to keep the plurality of battery cells 200 in an aligned state, thereby ensuring the accuracy and stability of the tab welding. The positioning assembly is arranged on the base 10, and the positioning assembly and the base 10 jointly form a limiting space 30 for the battery cells 200, and the positioning assembly can limit the battery cells 200 placed in the limiting space 30. The position of the positioning assembly relative to the base 10 is adjustable.

[0031] The limiting space 30 is jointly formed by the positioning assembly and the base 10, and the size of the limiting space 30 can be adjusted by adjusting the position of the positioning assembly relative to the base 10, so that battery cells 200 of different sizes and specifications can be stacked and placed in the limiting space 30, thereby improving the applicability of the battery cell fixing device 100. The plurality of battery cells 200 placed in the limiting space 30 are limited by the positioning assembly, so that the plurality of battery cells 200 can be kept stable during subsequent tab welding, thereby improving the welding precision and efficiency of the tabs, reducing the probability of tab position deviation, and thereby reducing the scrap rate and production cost.

[0032] In some embodiments, the positioning assembly includes at least two positioning members 20, and the two positioning members 20 and the base 10 form the limiting space 30, and the two positioning members 20 can respectively abut two parallel sides of the battery cell 200, thereby positioning the plurality of battery cells 200 in the limiting space 300.

[0033] Specifically, in the illustrated embodiment, a square battery cell 200 is taken as an example, which includes four sides in the circumferential direction, and one of the sides is provided with a tab. The positioning member 20 is configured with three, and the three positioning members 20 and the base 10 form a limiting space 30 which is open at one end in the circumferential direction, so as to facilitate the stacking and placement of the plurality of battery cells 200 in the limiting space 30, and the tab is arranged at the open side, thereby avoiding damage to the tab caused by the positioning member 20 touching the tab, and facilitating the welding of the tab in the subsequent process, thereby improving the welding precision and efficiency of the tab.

[0034] Two of the positioning members 20 abut two parallel sides of the battery cell 200, and the other positioning member 20 abuts the side opposite to the side where the tab is arranged, so that the three positioning members 20 can clamp the plurality of stacked battery cells 200, so that the plurality of battery cells 200 can be kept stable during tab welding.

[0035] Optionally, the positioning member 20 is arranged to extend in a direction perpendicular to the base 10, so that the positioning member 20 can abut against the side surfaces of the plurality of stacked battery cells 200 at the same time to limit the plurality of battery cells 200. Further, the plurality of positioning members 20 have the same extension length, so that the plurality of positioning members 20 can have the same limiting effect on the battery cells 200, thereby ensuring the stability and reliability of the stacked arrangement of the plurality of battery cells 200.

[0036] Feasibly, the positioning member 20 is plate-shaped, and the plate-shaped positioning member 20 can have a large contact area with the side surfaces of the plurality of battery cells 200, so that the positioning member 20 can stably abut against the side surfaces of the plurality of battery cells 200, thereby enabling the positioning member 20 to have a good limiting effect on the plurality of battery cells 200.

[0037] In other embodiments not shown in the drawings, the positioning member 20 can also be configured to be L-shaped, and the L-shaped positioning member 20 is arranged at the four corners of the battery cell 200 to limit the square battery cell 200. It should be noted that as long as the limiting of the side wall of the battery cell 200 can be achieved, the number, shape and position of the positioning member 20 are not limited, and can be specifically set according to the shape and specifications of the battery cell 200 to be fixed.

[0038] It can be understood that the shape and size of the battery cell 200 are not limited in the present application, as long as the positioning member 20 can abut against the battery cell 200, so that the plurality of battery cells 200 stacked and arranged in the limiting space 30 can remain stable, for example, the battery cell 200 can also be a soft-pack battery cell 200 or a polygonal battery cell 200, etc.

[0039] In some embodiments, the size of the positioning assembly in the direction perpendicular to the plane of the base 10 is adjustable, so that the positioning assembly can be suitable for the stacking of different numbers of battery cells 200, or the positioning assembly can be suitable for the stacking of battery cells 200 with different thicknesses.

[0040] Referring to Figures 1 to 3 , the positioning member 20 comprises a first positioning part 21 and a second positioning part 22, the first positioning part 21 is arranged on the base 10, so that the position of the first positioning part 21 relative to the base 10 can be changed, the second positioning part 22 can change the position of the first positioning part 21 relative to the base 10, the second positioning part 22 is in sliding fit with the first positioning part 21 in the direction perpendicular to the plane of the base 10, so that the positioning member 20 can be extended or retracted in the vertical direction to change the end surface position of the positioning assembly in the direction away from the plane of the base 10, so that the positioning assembly can limit battery cells 200 with different thicknesses or different numbers in the horizontal direction, so that the battery cell fixing device 100 can be suitable for different stacking conditions of the battery cells 200.

[0041] Feasibly, in combination with Figure 1 andFigure 2 The second positioning part 22 is arranged on the side of the first positioning part 21 away from the limiting space 30 and is in sliding cooperation with the first positioning part 21, so that the second positioning part 22 can increase the extension length of the positioning member 20 in the direction perpendicular to the base 10, so that the positioning member 20 is suitable for different thicknesses or different numbers of battery cells.

[0042] In some possible embodiments, the second positioning part 22 is arranged on the side of the first positioning part 21 away from the limiting space 30, and the second positioning part 22 is in sliding cooperation with the first positioning part 21. Figure 1 and Figure 3 The first positioning part 21 is provided with two blocks, and the second positioning part 22 is arranged between the two first positioning parts 21. The two first positioning parts 21 simultaneously limit two parts of the side walls of the plurality of battery cells 200, so that the first positioning part 21 of the plurality of positioning members 20 can cooperate to clamp the battery cells 200 in the limiting space 30. The second positioning part 22 is in sliding cooperation with the two first positioning parts 21 in the direction perpendicular to the base 10, which helps to improve the stability and reliability of the second positioning part 22 during movement. The first positioning part 21 and the second positioning part 22 abut the side surfaces of the plurality of battery cells 200, thereby helping to ensure the stability of the battery cells 200 placed in the limiting space 30.

[0043] The second positioning part 22 moves relative to the two first positioning parts 21 in the direction perpendicular to the base 10, so that the second positioning part 22 can increase the extension length of the positioning member 20 in the direction perpendicular to the base 10. Therefore, the positioning member 20 can be suitable for stacking of a plurality of battery cells 200 with a larger height range, so that the positioning member 20 can be suitable for stacking of a plurality of battery cells 200 with different thicknesses, thereby improving the applicability of the battery cell fixing device 100.

[0044] It should be noted that, as long as the movement of the second positioning part 22 can be realized, the mounting mode of the second positioning part 22 is not limited in the present application, for example, the second positioning part 22 moves through a screw rod drive, a pneumatic cylinder drive, an electric telescopic rod drive, or along a guide rail.

[0045] In some possible embodiments, the positioning member 20 further comprises a third positioning part 23 arranged on the second positioning part 22. The third positioning part 23 can abut the top of the battery cell 200. The third positioning part 23 can fix the top of the plurality of battery cells 200 stacked and placed, so that the plurality of battery cells 200 in the limiting space 30 are limited in the vertical direction by the base 10 and the third positioning part 23 and are limited in the horizontal direction by the positioning member 20. Therefore, the battery cells 200 are prevented from shaking in the direction perpendicular to the base 10 and in the horizontal direction during tab welding, thereby ensuring the precision and reliability of tab welding. It should be noted that the top of the plurality of battery cells 200 in the present application refers to the surface of the uppermost battery cell 200 away from the base 10 after the plurality of battery cells 200 are stacked and placed.

[0046] Preferably, the third positioning part 23 is parallel to the top of the plurality of battery cells 200, thereby ensuring the third positioning part 23 limits the plurality of battery cells 200 in the direction perpendicular to the base 10.

[0047] Preferably, the third positioning part 23 is parallel to the top of the plurality of battery cells 200, thereby ensuring the third positioning part 23 limits the plurality of battery cells 200 in the direction perpendicular to the base 10.

[0048] In an optional embodiment, the second positioning part 22 is connected to the first positioning part 21 on one side in the direction perpendicular to the plane of the base 10, and connected to the third positioning part 23 on the other side, and the third positioning part 23 is rotatable relative to the second positioning part 22 and abuts against the battery cells 200. Specifically, the third positioning part 23 can be rotatable relative to the first positioning part 22 through a hinge, a rotating shaft or the like.

[0049] Specifically, the third positioning part 23 and the second positioning part 22 are hinged, and the third positioning part includes a first state and a second state, and in the first state, the third positioning part abuts against the top of the battery cells, and in the second state, the third positioning part abuts against the side wall of the battery cells.

[0050] Referring to Figure 1 In the first state, the third positioning part 23 and the second positioning part 22 are arranged at an included angle, the second positioning part 21 abuts against the side wall of the plurality of battery cells 200 towards the side wall of the limiting space 30, and the third positioning part 23 can abut against the top of the plurality of battery cells 200 towards the side wall of the limiting space 30.

[0051] Referring to Figure 2 In the second state, the third positioning part 23 and the second positioning part 22 are parallel towards the side wall of the limiting space 30, and the first positioning part 21, the second positioning part 22 and the third positioning part 23 all abut against the side wall of the plurality of battery cells 200 towards the side wall of the limiting space 30, and at this time, the first positioning part 21, the second positioning part 22 and the third positioning part 23 jointly limit the stacking direction of the plurality of battery cells 200, and the third positioning part 22 can increase the height of the first positioning part 21 and the second positioning part 22, i.e. the third positioning part 22 can extend the height of the positioning member 20 in the direction perpendicular to the plane of the base 10, and at this time, the positioning member 20 can be suitable for the stacking of the plurality of battery cells 200 in a larger height range, thereby making the positioning member 20 suitable for the stacking of the plurality of battery cells 200 in a larger thickness, and improving the applicability of the battery cell fixing device 100.

[0052] In other embodiments, the third positioning part 23 can also be fixedly connected to the second positioning part 22, that is, the third positioning part 23 only has the first state or the second state. By arranging the third positioning part 23 at an angle with the second positioning part 22, the third positioning part 23 can directly abut the top of the battery cell 200, achieving the limiting of the top of the battery cell 200 by the positioning member 20. By arranging the third positioning part 23 parallel to the second positioning part 22, the third positioning part 23 can increase the extension length of the positioning member 20 in the vertical direction, so as to be suitable for the limiting of battery cells 200 of different thicknesses or different numbers. Optionally, the third positioning part 23 and the second positioning part 22 are integrally formed.

[0053] In other possible embodiments, the third positioning part 23 can also be detachably connected to the second positioning part 22, so as to facilitate the installation and removal of the third positioning part 23. When the top of the battery cell 200 needs to be limited, the third positioning part 23 is installed on the side wall of the second positioning part 22 facing the limiting space 30, and the third positioning part 23 abuts the top of the battery cell 200. When the number of battery cells 200 is increased or the thickness of the battery cell 200 is changed, the third positioning part 23 installed on the side wall of the second positioning part 22 facing the limiting space 30 can be removed, so as to avoid damage to the battery cell 200 by the third positioning part 23, and the removed third positioning part 23 is installed on the end face of the second positioning part 22 away from the base 10, the third positioning part 23 is arranged in a direction perpendicular to the plane of the base 10, and the third positioning part 23 abuts the side wall of the battery cell 200.

[0054] In some embodiments, the battery cell fixing device 100 further comprises a fixing member 40 connected to the positioning member 20 and the base 10, and the fixing member 40 is used to keep the position of the positioning member 20 fixed relative to the base 10, so that after the battery cell 200 is placed in the limiting space 30, the battery cell 200 can be stably and effectively limited and fixed by the positioning member 20, ensuring the limiting effect of the positioning member 20 on the plurality of battery cells 200.

[0055] Feasibly, the base 10 is provided with a mounting hole 11 extending in a predetermined direction, and the fixing member 40 can move in the mounting hole 11 and abut the side wall of the positioning member 20 away from the limiting space 30, so that the positioning member 20 is slidably installed in the mounting hole 11 by the fixing member 40.

[0056] When battery cells 200 of different sizes are placed, the positioning member 20 moves along with the fixing member 40 in the predetermined direction and abuts the side of the battery cell 200, so that the size of the limiting space 30 is adapted to battery cells 200 of different sizes, and then the fixing member 40 is fixedly connected to the mounting hole 11, so that the position of the positioning member 20 can be kept stable, and thus the positioning member 20 can stably clamp the plurality of battery cells 200 placed in the limiting space 30.

[0057] It should be noted that as long as the fixing member 40 can be moved relative to the mounting hole 11 and fixedly connected to the mounting hole 11, the mode is within the protection scope of the present application, for example, the fixing member 40 is selected as a fastener, and the fastener is fastened to the mounting hole 11 of the base 10; or the mounting hole 11 is provided as a sawtooth shape, and the fixing member 40 is rotatably connected to the teeth of the mounting hole 11, so that the fixing member 40 has a moving state and a locking state, wherein in the moving state, the fixing member 40 is not engaged with the teeth of the mounting hole 11, and the fixing member 40 can freely move in the mounting hole 11 in a preset direction, and in the locking state, the fixing member 40 is engaged with the teeth of the mounting hole 11, so that the fixing member 40 is fixed to the base 10.

[0058] Alternatively, the mounting hole 11 can be provided as a plurality according to the shape of the positioning member 20, and correspondingly, the fixing member 40 is also provided with a plurality, so that the fixing member 40 can abut a plurality of positions of the positioning member 20, to ensure the abutting stability of the inner wall of the positioning member 20 to the side surface of the plurality of battery cells 200, and further to make the plurality of battery cells 200 remain stable.

[0059] It can be understood that as long as the fixing member 40 can fix the positioning member 20 to the base 10, the fixing member 40 is not limited to abutting the side wall of the positioning member 20, for example, in other embodiments, the fixing member 40 can also be connected to the bottom of the positioning member 20, and the positioning member 20 can slide on the base 10 in a preset direction to change the size of the limiting space 30, and further to be suitable for battery cells 200 of different sizes and specifications, and the fixing member 40 is connected to the bottom of the positioning member 20 through the mounting hole 11, so that the positioning member 20 can be fixed on the base 10.

[0060] In an embodiment not shown, the battery cell fixing device 100 can also not need the fixing member 40, and the assembly hole can be provided on the base 10 in a preset direction, and the positioning member 20 can be selectively assembled in different assembly holes to change the limiting space 30.

[0061] The position of the positioning assembly on the base can be adjusted according to the specifications and sizes of the battery cells 200, and can be suitable for battery cells 200 of different sizes and specifications, and the positioning assembly can limit the battery cells 200, so that the battery cells 200 remain in a stable state, so that the tabs can remain aligned during welding, avoiding the tabs to be shifted in position, improving the precision and efficiency of tab welding, and reducing the scrap rate and production cost.

[0062] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0063] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electrode fixing device characterized by comprising: The electric cell fixing device comprises a base and a positioning assembly, the base is used for carrying the electric cell; the positioning assembly is arranged on the base and forms a limiting space of the electric cell; wherein the position of the positioning assembly on the base is adjustable; the size of the positioning assembly in the direction perpendicular to the plane of the base is adjustable.

2. The cell fixation device of claim 1, wherein, The positioning assembly comprises at least two positioning members, the two positioning members form the limiting space and can abut against two parallel sides of the electric cell.

3. The cell fixture of claim 2, wherein, The base is provided with a mounting hole, and the positioning member is slidingly installed in the mounting hole through a fixing member.

4. The cell holder of claim 2, wherein The positioning member comprises a first positioning part and a second positioning part, the first positioning part is arranged on the base, and the second positioning part is slidingly matched with the first positioning part in the direction perpendicular to the plane of the base; the first positioning part and the second positioning part can abut against the electric cell.

5. The cell fixture of claim 4, wherein, The positioning member further comprises a third positioning part, the third positioning part is arranged on the second positioning part and can abut against the top of the electric cell.

6. The cell fixture of claim 5, wherein, The third positioning part can also abut against the side wall of the electric cell.

7. The cell fixture of claim 6, wherein, The third positioning part is hinged with the second positioning part and comprises a first state and a second state, the third positioning part abuts against the top of the electric cell when in the first state, and the third positioning part abuts against the side wall of the electric cell when in the second state.

8. The cell holder of claim 4, wherein The first positioning part is provided with two blocks, and the second positioning part is arranged between the two blocks of the first positioning part and is slidingly matched with the first positioning part.

9. The cell holder of claim 4, wherein, The second positioning part is arranged on the side of the first positioning part away from the limiting space and is slidingly matched with the first positioning part.

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