CN219873866U - Cell module - Google Patents

Abstract

The embodiment of the utility model provides a battery core module, which comprises a battery core group, a first end plate, a second end plate, a bolt and a nut, wherein a plurality of battery core groups are arranged in a stacked mode, the first end plate is arranged at one end of the battery core groups, the first end plate is provided with a first through hole, the second end plate is arranged at the other end of the battery core groups, the second end plate is provided with a second through hole, the hole wall surface of the second through hole is provided with a first abutting plane, a screw rod of the bolt comprises an abutting section and a threaded section, the outer circumferential surface of the abutting section is provided with a second abutting plane, the screw rod is arranged in the first through hole and the second through hole in a penetrating mode, the first abutting plane and the second abutting plane are oppositely arranged in the radial direction of the screw rod to limit the relative position of the bolt and the second end plate, and the nut is connected with the threaded section in a matching mode. In the process of locking the nut, the battery cell module provided by the embodiment of the utility model is stopped against the second abutting plane through the first abutting plane, so that the bolt is prevented from generating elastic deformation perpendicular to the axial direction of the bolt.

Description

Cell module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell module.

Background

The cell module comprises a plurality of cell modules which are arranged in a stacked mode and end plates which are arranged at two ends of the plurality of cell modules, wherein the end plates at two ends penetrate through bolts and are locked by nuts on the bolts. However, in the assembly process of the battery cell module, because the length of the bolt is long, in the process of applying torsion to the nut to lock, the bolt can generate elastic deformation perpendicular to the axial direction of the bolt along with the torsion direction, and after the nut reaches a locking position and stops being screwed, the bolt can rebound and recover, so that the nut leaves the locking position, the locking force of the nut is weakened, and the condition that the nut is untwisted and loosened easily occurs.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, an embodiment of the utility model provides a battery cell module, wherein a first abutting plane is arranged on a second end plate, a second abutting plane is arranged on a bolt, the first abutting plane and the second abutting plane are oppositely arranged in the radial direction of the bolt, and in the process of locking a nut, the first abutting plane is stopped against the second abutting plane, so that elastic deformation perpendicular to the axial direction of the bolt is avoided.

The cell module of the embodiment of the utility model comprises:

the battery cell groups are multiple, and the multiple battery cell groups are stacked in the first direction;

the first end plate is arranged at one ends of the plurality of battery cell groups in the first direction and is provided with a first through hole;

the second end plates are arranged at the other ends of the plurality of battery cell groups in the first direction, each second end plate is provided with a second through hole, and the hole wall surfaces of the second through holes are provided with first abutting planes;

a bolt having a nut and a screw rod, the screw rod including an abutment section and a threaded section, the outer peripheral surface of the abutment section having a second abutment plane, the screw rod being threaded in the first through hole and the second through hole, and the nut abutting against an end surface of the first end plate remote from the second end plate, the first abutment plane and the second abutment plane being arranged opposite to each other in a radial direction of the bolt to define a relative position of the bolt and the second end plate;

the nut is connected with the threaded section in a matched mode and is abutted to the end face, away from the first end plate, of the second end plate.

According to the battery cell module, the first abutting plane is arranged on the second through hole of the second end plate, the second abutting plane is arranged on the bolt, the first abutting plane and the second abutting plane are oppositely arranged in the radial direction of the bolt, and in the process of locking the nut, the first abutting plane is abutted against the second abutting plane, so that elastic deformation of the bolt perpendicular to the axial direction of the bolt is avoided.

In some embodiments, the second abutment planes are a plurality of, the second abutment planes are arranged at intervals in the circumferential direction of the screw, or the second abutment planes are sequentially connected in the circumferential direction of the screw;

the first abutting planes are multiple, and the first abutting planes and the second abutting planes are in one-to-one correspondence.

In some embodiments, the projection of the abutment segment is a polygon, each side of the polygon being a projection of the second abutment plane, within a projection plane orthogonal to the first direction.

In some embodiments, the cell module further includes a profiling piece fixedly connected to the second end plate, the profiling piece having a third through hole with a wall surface having a third abutment plane, the third abutment plane and the second abutment plane being oppositely disposed in a radial direction of the bolt, a projection of the third through hole coinciding with a projection of the second through hole in a projection plane orthogonal to the first direction.

In some embodiments, the nut abuts an end surface of the profiling piece remote from the second end plate.

In some embodiments, the profile strip includes a first profile strip, one end surface of the first profile strip in the first direction is fixedly connected to the second end plate, the first profile strip has the third through hole, and the third through hole is in communication with the second through hole.

In some embodiments, the profile modeling sheet comprises a second profile modeling sheet comprising a sheet body and a support portion extending from the sheet body toward the second end plate and fixedly connected to the second end plate, the sheet body having the third through hole.

In some embodiments, the support extends from an edge of the sheet body toward the second end plate.

In some embodiments, the second profiling piece has a viewing port, the opening direction of which is a second direction, the second direction being orthogonal to the first direction.

In some embodiments, the bolt has a dimension in the first direction of 1m-1.8m;

the screw rod still includes the cylinder section, the cylinder section the butt section with the screw thread section is in the first direction sets gradually, just the cylinder section with the nut links to each other, first terminal plate is established on the cylinder section.

Drawings

Fig. 1 is a schematic structural diagram of a battery cell module according to an embodiment of the utility model;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a front view of the first end plate of FIG. 1;

FIG. 4 is a front view of the second end plate and profiling tab of FIG. 1;

FIG. 5 is a side view of a bolt of a battery cell module according to an embodiment of the present utility model;

FIG. 6 is a top view of the bolt of FIG. 5;

FIG. 7 is an elevation view of the bolt of FIG. 5;

fig. 8 is a schematic diagram of a second embodiment of a battery cell module;

FIG. 9 is an enlarged schematic view of portion B of FIG. 8;

fig. 10 is a side cross-sectional view of the battery cell module of fig. 8;

FIG. 11 is an enlarged schematic view of portion C of FIG. 10;

fig. 12 is a schematic view of the structure of the second profiling piece in fig. 11.

Reference numerals:

1. a cell group; 2. a first end plate; 21. a first through hole; 3. a second end plate; 31. a second through hole; 311. a first abutment plane; 4. a bolt; 41. a screw cap; 42. a screw; 421. an abutment section; 4211. a second abutment plane; 422. a threaded section; 423. a cylindrical section; 5. a nut; 6. profiling sheets; 61. a third through hole; 611. a third abutment plane; 62. a first profiling piece; 63. a second profiling piece; 631. a sheet body; 632. a support part; 633. and (5) an observation port.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A cell module according to an embodiment of the utility model is described below with reference to fig. 1-12.

As shown in fig. 1-12, the cell module of the embodiment of the present utility model includes a cell module 1, a first end plate 2, a second end plate 3, a bolt 4, and a nut 5.

The plurality of cell groups 1 are stacked in the first direction (the front-rear direction as shown in fig. 1). Specifically, as shown in fig. 1, 8 and 10, the battery cell group 1 includes a plurality of rows of battery cells and a first busbar, which are stacked in the left-right direction, each row of battery cells includes a plurality of battery cells, which are arranged in the up-down direction, two adjacent rows of battery cells are connected through the first busbar so that the plurality of rows of battery cells are connected in series, each battery cell group has a connecting end of the first busbar located at the end in the left-right direction, the connecting ends of the two adjacent battery cell groups are connected through a second busbar so that the plurality of battery cell groups 1 are connected in series, each battery cell group further includes two clamping plates, which are connected in a butt joint manner in the front-rear direction, and the plurality of battery cells of the battery cell group are clamped between the two clamping plates. Preferably, the battery cell is a cylindrical battery cell extending in the front-rear direction.

The first terminal plate 2 is provided at one end of the plurality of cell groups 1 in the first direction, and the first terminal plate 2 has a first through hole 21. Specifically, as shown in fig. 1, 3, 8 and 10, the first end plate 2 is disposed at the rear ends of the plurality of battery cells 1, an insulating sheet is disposed between the first end plate 2 and the adjacent clamping plate, and the first end plate 2 has a plurality of first through holes 21.

The second end plate 3 is disposed at the other ends of the plurality of cell groups 1 in the first direction, the second end plate 3 has a second through hole 31, and a wall surface of the second through hole 31 has a first abutment plane 311. Specifically, as shown in fig. 1, 4, 8 and 10, the second end plate 3 is disposed at the front ends of the plurality of battery cells 1, an insulating sheet is disposed between the second end plate 3 and the adjacent clamping plate, the second end plate 3 has a plurality of second through holes 31, the hole wall surface of the second through hole 31 has a first abutting plane 311, and the first abutting plane 311 may be a smooth plane or may have a bending line or a ripple.

The bolt 4 has a nut 41 and a screw 42, the screw 42 includes an abutment section 421 and a threaded section 422, the outer peripheral surface of the abutment section 421 has a second abutment plane 4211, the screw 42 is inserted into the first through hole 21 and the second through hole 31, and the nut 41 abuts against the end surface of the first end plate 2 away from the second end plate 3, the first abutment plane 311 and the second abutment plane 4211 are oppositely arranged in the radial direction of the bolt 4 to define the relative positions of the bolt 4 and the second end plate 3. The nut 5 is connected with the threaded section 422 in a matching manner and abuts against the end face of the second end plate 3, which is far away from the first end plate 2.

Specifically, as shown in fig. 1, 3, 4, 5, 6, 7, 10 and 11, the bolt 4 extends in the front-rear direction, the screw rod 42 of the bolt 4 is inserted into the first through hole 21 and the second through hole 31, the rear end of the bolt 4 has a nut 41, the nut 41 is directly abutted against the rear end surface of the first end plate 2, or a spacer is provided between the nut 41 and the rear end surface of the first end plate 2, the nut 41 indirectly abuts against the rear end surface of the first end plate 2 through the spacer, the front end of the bolt 4 has an abutment section 421 and a screw thread section 422, the outer circumferential surface of the abutment section 421 has a second abutment plane 4211, the second abutment plane 4211 is arranged opposite to the first abutment plane 311 in the radial direction of the bolt 4, the second abutment plane 4211 may abut against the first abutment plane 311, or a slight installation gap may be provided, the nut 5 is connected in cooperation with the screw thread section 422 and directly abuts against the front end surface of the second end plate 3, or a spacer is provided between the nut 5 and the second end plate 3, and the front end plate 3 indirectly abuts against the front end surface of the second end plate 3 through the spacer. Thereby fastening the first end plate 2, the plurality of cell groups 1, and the second end plate 3 by the bolts 4 and the nuts 5. Preferably, the dimension of the bolt 4 in the front-rear direction is 1m to 1.8m, more preferably 1.2m or 1.5m.

According to the battery cell module, the first abutting plane is arranged on the second through hole of the second end plate, the second abutting plane is arranged on the bolt, the first abutting plane and the second abutting plane are oppositely arranged in the radial direction of the bolt, in the process of applying torsion to the nut to lock, the first abutting plane abuts against the second abutting plane, the torsion is absorbed by the second end plate, and therefore elastic deformation of the bolt along with the torsion direction perpendicular to the axial direction of the bolt is avoided, and the situation that untwisting and loosening are not generated after the nut reaches a locking position and stops twisting is avoided.

In some embodiments, the second abutment surfaces 4211 are a plurality of, the plurality of second abutment surfaces 4211 are disposed at intervals in the circumferential direction of the screw 42, or the plurality of second abutment surfaces 4211 are sequentially connected in the circumferential direction of the screw 42. The plurality of first contact planes 311 are provided, and the plurality of first contact planes 311 and the plurality of second contact planes 4211 are provided in one-to-one correspondence.

As shown in fig. 5 to 7, the second abutment surfaces 4211 are two spaced apart in the left-right direction, the two second abutment surfaces 4211 are disposed in parallel, the two second abutment surfaces 4211 are connected by an arc surface, the first abutment surfaces 311 are also disposed two spaced apart in the left-right direction, and the two first abutment surfaces 311 are disposed in one-to-one correspondence with the two second abutment surfaces 4211.

It will be appreciated that the plurality of second abutment planes are not limited to being disposed at intervals in the circumferential direction of the screw, and in other embodiments, two second abutment planes are provided, one ends of the two second abutment planes are connected to form a right angle, and the other ends of the two second abutment planes are connected by an arc surface.

It will be appreciated that the number of second abutment planes is not limited to a plurality, and in other embodiments, only one second abutment plane is provided.

In some embodiments, the projection of the abutment section 421 is a polygon within a projection plane orthogonal to the first direction, each side of the polygon being a projection of the second abutment plane 4211.

Specifically, the second abutment surfaces 4211 are plural, and the second abutment surfaces 4211 are circularly connected in the circumferential direction of the screw 42, and the projection of the abutment section 421 is a polygon, for example, a quadrangle, a pentagon, or a hexagon, in which each side of the polygon is the projection of the second abutment surface 4211, in other words, the abutment section 421 is a polygonal column.

In some embodiments, the battery cell module according to the embodiment of the present utility model further includes a profiling sheet 6, where the profiling sheet 6 is fixedly connected to the second end plate 3, the profiling sheet 6 has a third through hole 61, a hole wall surface of the third through hole 61 has a third abutment plane 611, the third abutment plane 611 and the second abutment plane 4211 are oppositely arranged in a radial direction of the bolt 4, and in a projection plane orthogonal to the first direction, a projection of the third through hole 61 coincides with a projection of the second through hole 31.

As shown in fig. 2, 4 and 9, the front end surface of the second end plate 3 is provided with a profiling sheet 6, and the profiling sheet 6 is fixedly connected, preferably welded, with the second end plate 3, the profiling sheet 6 has a third through hole 61, the hole wall surface of the third through hole 61 has a third abutting plane 611, and in a projection plane orthogonal to the first direction, the projection of the third through hole 61 coincides with the projection of the second through hole 31, in other words, the third through hole 61 and the second through hole 31 are sequentially arranged or spaced in the front-back direction, and the third abutting plane 611 and the first abutting plane 311 are located in the same plane or are arranged in parallel, preferably in the same plane. The screw 42 is inserted into the third through hole 61, and the second contact plane 4211 and the third contact plane 611 of the contact section 421 are arranged to face each other in the radial direction of the bolt 4, and the second contact plane 4211 and the third contact plane 611 may be in contact with each other or may have a small installation gap.

The setting profiling piece has two effects, and at first the profiling piece can play the effect of strengthening second end plate intensity, through setting up the supplementary first butt plane of third butt plane, in the in-process that exerts torsion in order to lock to the nut, third butt plane and first butt plane stop the second butt plane jointly to avoid the bolt to produce perpendicular to bolt axial elastic deformation along with the torsion direction.

Meanwhile, the profiling sheet can also play a role in avoiding assembly failure caused by clamping of the shaft shoulder of the screw rod and the second end plate, as shown in fig. 5 and 6, the cross section size of the abutting section is larger than that of the threaded section, so that the shaft shoulder is formed at the front end of the abutting section, when the battery cell module does not have the profiling sheet, the shaft shoulder is positioned in the second through hole of the second end plate, the effect of preventing the battery cell module from being damaged due to excessive locking is achieved, but in the assembly process, when the assembly gap of the battery cell module is larger than the thickness of the second end plate in the front-rear direction, the shaft shoulder and the rear end surface of the second end plate are possibly clamped in an abutting mode, so that the nut is locked, but the problem of insufficient pre-pressure of the battery cell module, in other words, the battery cell module assembly failure is caused. After the profiling sheet is arranged, the sum of the thickness of the second end plate in the front-rear direction and the thickness of the profiling sheet in the front-rear direction is larger than the assembly gap of the battery cell module, and the assembly gap is eliminated through the thickness of the profiling sheet, so that the shaft shoulder is positioned in the third through hole after the assembly is completed, and the problem of assembly failure caused by the fact that the shaft shoulder abuts against the second end plate is avoided.

It will be appreciated that the profile tab is not limited to a welded connection with the second end plate, and in other embodiments the profile tab is adhesively connected with the second end plate, or is removably fixedly connected by screws or bolts.

In some embodiments, the nut 5 abuts an end surface of the profiling 6 remote from the second end plate 3.

As shown in fig. 2, 9 and 10, the profiling 6 is provided on the front end surface of the second end plate 3, and the nut 5 directly abuts against the front end surface of the profiling 6 or indirectly abuts against the profiling through a washer. Preferably, the profile strip 6 is rectangular in projection in the direction orthogonal to the front-rear direction, and is provided with a third through hole 61 at its center.

It will be appreciated that the projection of the cam in the direction orthogonal to the front-to-back direction is not limited to being rectangular, and in other embodiments the projection of the cam in the direction orthogonal to the front-to-back direction is circular or polygonal.

It will be appreciated that the cam is not limited to being connected between the nut and the second end plate, and in other embodiments the cam is provided on the rear face of the second end plate and the cam has a plurality of third through holes, the nut abutting the front face of the second end plate.

In some embodiments, the profile strip 6 includes a first profile strip 62, one end surface of the first profile strip 62 in the first direction is fixedly connected to the second end plate 3, the first profile strip 62 has a third through hole 61, and the third through hole 61 communicates with the second through hole 31.

In the embodiment shown in fig. 1 and 2, the second end plate 3 is provided with only the first profiling piece 62, the first profiling piece 62 is sheet-shaped, the front end surface of the second end plate 3 is welded with the rear end surface of the first profiling piece 62, the first profiling piece 62 is provided with the third through hole 61, the third through hole 61 is communicated with the second through hole 31, the nut 5 is abutted against the front end surface of the first profiling piece 62 through a gasket, and the shaft shoulder of the screw 42 is positioned in the third through hole 61 of the first profiling piece 62.

In some embodiments, profile sheet 6 includes a second profile sheet 63, second profile sheet 63 including a sheet body 631 and a support 632, support 632 extending from sheet body 631 toward second end plate 3 and fixedly connected to second end plate 3, sheet body 631 having third through hole 61.

In the embodiment shown in fig. 9 and 10, the second end plate 3 is provided with the first profiling sheet 62 and the second profiling sheet 63 at the same time, the second profiling sheet 63 includes a sheet body 631 and a supporting portion 632, the sheet body 631 and the first profiling sheet 62 are arranged at intervals in the front-rear direction, the sheet body 631 also has the third through hole 61, the supporting portion 632 extends backwards from the sheet body 631 and is welded to the front end surface of the first profiling sheet 62, so that the supporting portion 632 is indirectly fixedly connected with the second end plate 3, the nut 5 is abutted against the front end surface of the sheet body 631 through a gasket, the screw 42 is simultaneously penetrated through the first profiling sheet 62 and the second profiling sheet 63, and the shaft shoulder of the screw 42 is located in the third through hole 61 of the sheet body 631.

The second profiling piece is provided with the supporting part, so that the assembly gap with larger size can be absorbed, and the second profiling piece is suitable for the battery cell modules with larger size in the front-back direction or the battery cell modules with more battery cell groups.

It will be appreciated that the support portion of the second cam is not limited to being connected to the first cam, and in other embodiments the support portion of the second cam is welded to the front face of the second end plate such that the support portion is fixedly connected directly to the second end plate.

It will be appreciated that the second cam is not limited to being provided simultaneously with the first cam, and in other embodiments, only the second cam is provided on the second end plate.

In some embodiments, the support 632 extends from an edge of the sheet body 631 toward the second end plate 3.

As shown in fig. 12, the sheet body 631 is a rectangular sheet having four edges, the support portions 632 are sheet-like extending in the front-rear direction, the number of the support portions 632 is three, and the three support portions 632 are provided in one-to-one correspondence with the three edges of the sheet body 631.

It is to be understood that the support portions are not limited to three, and in other embodiments, the support portions are provided at two edges of the sheet body that are disposed opposite to each other in the up-down direction or at two edges that are disposed opposite to each other in the left-right direction.

It will be appreciated that the support portions are not limited to extending rearwardly from the edge of the sheet body, and in other embodiments, the support portions extend rearwardly from the rear end face of the sheet body, and the support portions are only one, with the projection of the support portions being circular or polygonal in a plane of projection orthogonal to the front-rear direction, and the projection of the support portions surrounding the projection of the third through hole.

In some embodiments, the second profiling piece 63 has a viewing port 633, and the opening direction of the viewing port 633 is a second direction (up and down direction as shown in fig. 8), which is orthogonal to the first direction.

As shown in fig. 8, 9, 11 and 12, the sheet body 631 has four edges in total, three of which have support portions 632, and observation openings 633 are formed at edges where the support portions 632 are not provided, and the condition between the sheet body 631 and the second end plate 3 can be observed through the observation openings 633 to observe the positions of the shoulders of the screw 42 in the front-rear direction.

It will be appreciated that the structure of the viewing port is not limited to that shown in fig. 9, 11 and 12, and in other embodiments, the four edges of the sheet body are each provided with a support portion, wherein one support portion located in the left-right direction is provided with a fourth through hole, and the fourth through hole penetrates the support portion in the left-right direction, and the fourth through hole serves as the viewing port.

In some embodiments, the screw 42 further includes a cylindrical section 423, the abutment section 421, and the threaded section 422 are disposed in this order in the first direction, and the cylindrical section 423 is connected to the nut 41, with the first end plate 2 being disposed on the cylindrical section 423.

As shown in fig. 5 and 10, the screw 42 further includes a cylindrical section 423, the nut 41, the cylindrical section 423, the abutment section 421, and the threaded section 422 are sequentially disposed in a rear-to-front direction, the first end plate 2 is disposed on the cylindrical section 423 in a penetrating manner, the first through hole 21 is circular in shape matching the cylindrical section 423, and the second end plate 3 is disposed on the abutment section 421 in a penetrating manner.

In the description of the present utility model, it should be understood that the terms "center", "length", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between and not for indicating or implying a relative importance or an implicit indication of the number of features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims (10)

1. A battery cell module, comprising:

the battery cell assembly comprises a plurality of battery cell assemblies (1), wherein the battery cell assemblies (1) are stacked in a first direction;

a first end plate (2), wherein the first end plate (2) is arranged at one end of the plurality of cell groups (1) in the first direction, and the first end plate (2) is provided with a first through hole (21);

the second end plates (3) are arranged at the other ends of the plurality of the battery cell groups (1) in the first direction, the second end plates (3) are provided with second through holes (31), and the hole wall surfaces of the second through holes (31) are provided with first abutting planes (311);

a bolt (4), the bolt (4) having a nut (41) and a screw (42), the screw (42) including an abutment section (421) and a threaded section (422), the outer peripheral surface of the abutment section (421) having a second abutment plane (4211), the screw (42) being threaded into the first through hole (21) and the second through hole (31), and the nut (41) abutting an end surface of the first end plate (2) remote from the second end plate (3), the first abutment plane (311) and the second abutment plane (4211) being arranged opposite to each other in a radial direction of the bolt (4) to define a relative position of the bolt (4) and the second end plate (3);

the nut (5) is connected with the threaded section (422) in a matching way and is abutted with the end face, away from the first end plate (2), of the second end plate (3).

2. The battery cell module according to claim 1, wherein the second abutment planes (4211) are plural, the plural second abutment planes (4211) are disposed at intervals in the circumferential direction of the screw (42), or the plural second abutment planes (4211) are sequentially connected in the circumferential direction of the screw (42);

the number of the first abutting planes (311) is plural, and the first abutting planes (311) and the second abutting planes (4211) are arranged in one-to-one correspondence.

3. The battery cell module according to claim 2, wherein the projection of the abutment section (421) is polygonal in a projection plane orthogonal to the first direction, each side of the polygon being a projection of the second abutment plane (4211).

4. The battery cell module according to claim 1, further comprising a profiling sheet (6), wherein the profiling sheet (6) is fixedly connected with the second end plate (3), the profiling sheet (6) is provided with a third through hole (61), the hole wall surface of the third through hole (61) is provided with a third abutting plane (611), the third abutting plane (611) and the second abutting plane (4211) are oppositely arranged in the radial direction of the bolt (4), and in a projection plane orthogonal to the first direction, the projection of the third through hole (61) coincides with the projection of the second through hole (31).

5. The cell module according to claim 4, characterized in that the nut (5) abuts against an end face of the profiling piece (6) remote from the second end plate (3).

6. The battery cell module according to claim 4, wherein the profile strip (6) comprises a first profile strip (62), one end surface of the first profile strip (62) in the first direction is fixedly connected with the second end plate (3), the first profile strip (62) is provided with the third through hole (61), and the third through hole (61) is communicated with the second through hole (31).

7. The cell module according to any one of claims 4-6, wherein the profiling sheet (6) comprises a second profiling sheet (63), the second profiling sheet (63) comprising a sheet body (631) and a support (632), the support (632) extending from the sheet body (631) towards the second end plate (3) and being fixedly connected to the second end plate (3), the sheet body (631) having the third through hole (61).

8. The cell module according to claim 7, wherein the support (632) extends from an edge of the tab body (631) towards the second end plate (3).

9. The battery cell module according to claim 7, wherein the second profiling sheet (63) has a viewing port (633), and an opening direction of the viewing port (633) is a second direction, and the second direction is orthogonal to the first direction.

10. The cell module according to claim 1, characterized in that the dimension of the bolt (4) in the first direction is 1m-1.8m;

the screw rod (42) further comprises a cylindrical section (423), the abutting section (421) and the threaded section (422) are sequentially arranged in the first direction, the cylindrical section (423) is connected with the nut (41), and the first end plate (2) is arranged on the cylindrical section (423).