CN220382278U - Battery cell, battery module and battery pack - Google Patents

Abstract

The embodiment of the utility model provides a battery cell, a battery module and a battery pack. The battery cell comprises a battery end cover and a plurality of bare cells, each bare cell comprises a battery cell main body and a pole lug which are connected, the pole lugs of two adjacent bare cells are connected, and the pole lugs of two adjacent bare cells form an overlapping part in the thickness direction perpendicular to the battery end cover; the battery end cover comprises an end cover body and a pole, wherein the pole penetrates through the end cover body, and the pole is connected with the overlapping part. Therefore, the battery cell according to the embodiment of the utility model has the advantages of improving the charging efficiency, the energy density, the assembly efficiency and reducing the assembly cost.

Description

Battery cell, battery module and battery pack

Technical Field

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

Background

With the development of new energy automobiles, the fast-charge requirements for batteries are more and more, and the fast-charge requirements for battery cells are more and more. In the related art, a bare cell is connected with a top cover through a connecting sheet, and a lug of the bare cell is welded to the connecting sheet through ultrasonic welding and then connected with a pole through the connecting sheet. In the process of charging and discharging, current is required to be conducted between the lug and the pole through the connecting sheet, and because negative ions are required to migrate through the connecting sheet during charging and discharging, the problems of long travel, poor overcurrent capacity and large internal resistance exist, so that the problems of low charging efficiency and low safety performance caused by charging heating temperature rise are caused.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, an embodiment of the present utility model proposes a cell. The battery cell has the advantages of improving charging efficiency, energy density, assembly efficiency and reducing cost of a battery cell material.

The embodiment of the utility model also provides a battery module.

The embodiment of the utility model also provides a battery pack.

The battery cell of the embodiment of the utility model comprises a battery end cover and a plurality of bare cells.

The battery end cover comprises an end cover body and a pole, the pole is arranged on the end cover body in a penetrating mode, each bare cell comprises a cell main body and a pole lug which are connected, the pole lugs of two adjacent bare cells are orthogonal to the thickness direction of the battery end cover to form an overlapping portion, and the pole is connected with the overlapping portion.

According to the battery cell provided by the embodiment of the utility model, the electrode lugs of the two adjacent bare cells form the overlapped part in the thickness direction perpendicular to the battery end cover, and the overlapped part is directly connected with the electrode post, so that the connection between the electrode lugs and the electrode post can be realized without arranging a connecting sheet. Thus, the current stroke path can be reduced when the battery is charged. Therefore, the charging efficiency of the battery pack with the battery cell is improved. Meanwhile, the connection between the electrode lug and the electrode post is not needed through the connecting sheet, so that the material cost of the battery cell is reduced, the weight of the battery cell is reduced, and the assembly steps of the battery cell are simplified. Therefore, the battery cell provided by the embodiment of the utility model reduces the cost of the battery cell, reduces the weight of the battery cell and improves the assembly efficiency.

In addition, the overlapping part formed by the lugs of the two adjacent bare cells can reduce the interval between the adjacent bare cells. Therefore, the energy density of the battery cell is improved.

Therefore, the battery core of the embodiment of the utility model improves the charging efficiency, the energy density and the assembly efficiency and reduces the cost of the battery core material.

In some embodiments, the tabs of the same bare cell include a first tab and a second tab, the first tab and the second tab are disposed on the same side of the cell body, the posts include a first post and a second post disposed on the end cover body, the first tab and the second tab of the same bare cell are disposed at intervals in a length direction of the battery end cover, the first tabs of two adjacent bare cells are connected to form a first overlapping portion, the second tabs of two adjacent bare cells are connected to form a second overlapping portion, the first overlapping portion is connected with the first post, and the second overlapping portion is connected with the second post.

In some embodiments, the first tab of one of the die cells and the first tab of the die cell adjacent thereto are symmetrically disposed, and the second tab of one of the die cells and the second tab of the die cell adjacent thereto are symmetrically disposed.

In some embodiments, the first tab includes a plurality of layers of positive single tab, the plurality of layers of positive single tab being arranged in a gathered and stacked manner.

In some embodiments, the second tab comprises a plurality of layers of negative monolithic tabs arranged in a gathered and layered manner.

In some embodiments, the positive single tab of the multilayer is welded or bonded to form the positive tab and the negative single tab of the multilayer is welded or bonded to form the negative tab.

In some embodiments, the overlap has oppositely disposed first and second sides along a thickness direction of the battery end cap, the first side having a weld area welded with the post.

In some embodiments, the tab comprises a plurality of tab singlets that are gathered and laminated, and the projection of the welding area on the outermost tab singlets along the thickness direction of the battery end cover is all on the outermost tab singlets.

In some embodiments, each tab monolithic includes a cover portion directly connected to the cell body and a welded portion disposed on a side of the cover portion remote from the cell body, the area of the overlap portion being 80% -95% of the area of the welded portion.

In some embodiments, the cell body has a first surface and a second surface disposed opposite each other along a thickness of the battery end cap, the battery end cap is adjacent to the first surface, and a distance between the first side of the tab and the first surface in a thickness direction of the battery end cap is 0mm-10mm.

In some embodiments, the battery cell further comprises a protective adhesive layer, wherein the protective adhesive layer comprises a tab laying part, and the tab laying part is arranged on the second side in a covering way; or the protective adhesive layer comprises a tab laying part and an outer edge part which extends along the thickness direction of the battery end cover along the edge of the tab laying part, the tab laying part is arranged on the second side, and the outer edge part is attached to the battery core main body.

In some embodiments, the terminal post comprises a first post section and a second post section which are sequentially arranged along the thickness direction of the battery end cover, the outer diameter of the first post section is smaller than that of the second post section, the first post section and the second post section form a limiting step at a connecting position, the first post section is arranged on the end cover body in a penetrating manner, the second post section is abutted to one side, opposite to the tab, of the end cover body, and the overlapping portion is connected with the second post section.

The battery module according to the embodiment of the present utility model may include a plurality of the electric cells according to any one of the above embodiments.

The battery pack of the embodiment of the utility model can comprise a battery box and the battery module according to the embodiment of the utility model, wherein the battery module is arranged in the battery box.

Drawings

Fig. 1 is a front view of a battery cell according to an embodiment of the present utility model.

Fig. 2 is a cross-sectional view taken along line A-A in fig. 1.

FIG. 3 is an enlarged view of FIG. 2 at B

Fig. 4 is an exploded view of a cell according to an embodiment of the present utility model.

Fig. 5 is a rear view of a cell of an embodiment of the present utility model.

Fig. 6 is a perspective view of a battery cell according to an embodiment of the utility model, with a battery end cap omitted.

Fig. 7 is a front view of a battery cell according to an embodiment of the utility model, with the battery end cap omitted.

Fig. 8 is a perspective view of a battery end cap according to an embodiment of the present utility model.

Reference numerals:

a cell 100;

a battery end cap 1;

an end cap body 11; a pole 12; a first column section 121; a second column section 122;

a bare cell 2; a cell main body 21; a first surface 211; a second surface 212;

a tab 22; a first tab 221; a second tab 222;

an overlapping portion 3;a first side 31; a solder pad region 311; a second side (not shown);

and a protective adhesive layer 4.

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.

The battery cell 100, and the battery module and the battery pack having the battery cell 100 according to the embodiments of the present utility model are described below with reference to fig. 1 to 8.

The battery cell 100 of the embodiment of the present utility model includes a battery end cap 1 and a plurality of bare cells 2.

The battery end cover 1 comprises an end cover body 11 and a pole 12, the pole 12 is arranged on the end cover body 11 in a penetrating mode, each bare cell 2 comprises a cell main body 21 and a pole lug 22 which are connected, the pole lugs 22 of two adjacent bare cells 2 form an overlapping portion 3 in the thickness direction perpendicular to the battery end cover 1, and the pole 12 is connected with the overlapping portion 3.

According to the battery cell 100 of the embodiment of the utility model, the electrode lugs 22 of the two adjacent bare cells 2 form the overlapped part 3 in the thickness direction perpendicular to the battery end cover 1, and the overlapped part 3 is directly connected with the electrode post 12, so that the connection between the electrode lugs 22 and the electrode post 12 can be realized without a connecting sheet. Thus, the current stroke path can be reduced when the battery is charged. Thereby, the charging efficiency of the battery pack having the battery cell 100 is improved. Meanwhile, the connection between the tab 22 and the pole 12 is not required to be realized through a connecting sheet, so that the material cost of the battery cell 100 is reduced, the weight of the battery cell 100 is reduced, and the assembly steps of the battery cell 100 are simplified. Therefore, the battery cell 100 of the embodiment of the utility model reduces the cost of the battery cell 100, reduces the weight of the battery cell 100, and improves the assembly efficiency.

In addition, by forming the overlapping portion 3 of the tabs 22 of the adjacent two bare cells 2, the pitch between the adjacent bare cells 2 can be reduced (specifically, after assembly, the two bare cells 2 are folded in the direction indicated by the arrow in fig. 1 and then put into the cell case). Thereby, the energy density of the battery cell 100 is advantageously increased.

Therefore, the battery cell 100 of the embodiment of the utility model improves the charging efficiency (quick charging capability), the energy density and the assembly efficiency, and simultaneously reduces the material cost of the battery cell 100.

Further, the bare cell 2 in the battery cell 100 in the embodiment is a wound bare cell 2 or a laminated bare cell 2.

For example, one of the plurality of bare cells 2 is a first bare cell 2, the other is a second bare cell 2, a first tab 221 of the first bare cell 2 overlaps a first tab 221 of the second bare cell 2 to form a first overlapping portion, and a second tab 222 of the first bare cell 2 overlaps a second tab 222 of the second bare cell 2 to form a second overlapping portion.

As shown in fig. 4, 6 and 7, the tab 22 of the same bare cell 2 includes a first tab 221 and a second tab 222 disposed on the same side of the cell main body 21, the tab 12 includes a first tab 12 and a second tab 12 disposed on the end cover body 11, the first tab 221 and the second tab 222 of the same bare cell 2 are disposed at intervals in the width direction of the cell 100, the first tabs 221 of adjacent two bare cells 2 are connected to form a first overlapping portion, the second tabs 222 of adjacent two bare cells 2 are connected to form a second overlapping portion, the first overlapping portion is connected to the first tab 12, and the second overlapping portion is connected to the second tab 12.

In the battery cell 100 of the embodiment of the present utility model, the first tab 221 (for example, the positive tab 22) and the second tab 222 (for example, the negative tab 22) of the same bare cell 2 are disposed on the same side of the battery cell main body 21, so that two bare cells 2 and one battery end cap 1 can form a battery cell 100 structure. Thus, the cell 100 structure is advantageous in reducing the number of the battery end caps 1. Therefore, the battery cell 100 of the embodiment of the utility model has the advantages of saving cost and simplifying the structure of the battery cell 100.

As shown in fig. 4, 6 and 7, the first tab 221 of one of the bare cells 2 and the first tab 221 of the bare cell 2 adjacent thereto are symmetrically disposed, and the second tab 222 of one of the bare cells 2 and the second tab 222 of the bare cell 2 adjacent thereto are symmetrically disposed. In other words, the first tab 221 and the second tab 222 of two adjacent bare cells 2 are symmetrically disposed.

In the battery cell 100 of the embodiment of the present utility model, the first tab 221 and the second tab 222 of two adjacent bare cells 2 are symmetrically disposed. Because the size and the position are relatively fixed, the arrangement and the processing of the bare cells 2 are facilitated. Therefore, the battery cell 100 of the embodiment of the utility model is beneficial to improving the assembly efficiency of the battery cell 100.

As shown in fig. 4, 6 and 7, the first tab 221 includes a plurality of layers of positive single tabs, and the plurality of layers of positive single tabs are arranged in a gathered and laminated manner. And/or, the second tab 222 includes multiple layers of negative monolithic tabs arranged in a gathered and laminated manner. In other words, the first tab 221 includes a plurality of layers of positive single tab, and the plurality of layers of positive single tab are arranged in a gathered and laminated manner; or, the second tab 222 includes a plurality of layers of negative single-piece tabs, and the plurality of layers of negative single-piece tabs are gathered and stacked.

According to the battery cell 100 disclosed by the embodiment of the utility model, the problem that the lugs 22 of the battery cell 100 are loose can be avoided by arranging the positive single lugs and/or the negative single lugs in a multi-layer gathering and stacking mode. Therefore, the battery cell 100 of the embodiment of the utility model has the advantage of good structural stability.

The positive single lugs and/or the negative single lugs are/is gathered and laminated, so that the space occupied by the lugs 22 can be reduced, the space occupied in the length direction of the battery cell 100 is reduced, and the energy density of the battery cell 100 is improved.

Optionally, the tab 22 is made of aluminum or copper.

Alternatively, multiple layers of positive single tab are welded or bonded to form positive tab 22 and multiple layers of negative single tab are welded or bonded to form negative tab 22. Therefore, the battery cell 100 of the embodiment of the utility model has the advantages of convenience in processing and high structural stability.

The overlap portion 3 has a first side 31 (for example, an upper side shown in fig. 6) and a second side (not shown, for example, a lower side shown in fig. 6) which are disposed opposite to each other in the thickness direction of the battery end cap 1, and the first side 31 has a solder land 311, and the solder land 311 is soldered to the post 12. It will be appreciated that the tab 22 is welded to the pole 12. According to the battery cell 100 provided by the embodiment of the utility model, the electrode lugs 22 and the electrode posts 12 are fixed in a welding mode, so that the assembly efficiency of the battery cell 100 is further improved.

The tab 22 includes a plurality of tab pieces stacked together and laminated, and projections of the weld areas 311 on the outermost tab piece in the thickness direction of the battery end cap 1 are all on the outermost tab piece.

In the battery core 100 of the embodiment of the utility model, the projection of the welding and printing area 311 on the lug single chip along the thickness direction of the battery end cover 1 is all on the outermost lug single chip, so that the lug single chip and the pole 12 can be ensured to have enough welding area, and the outermost lug single chip can be welded with the pole 12. Therefore, the battery cell 100 according to the embodiment of the utility model is beneficial to optimizing the battery overcurrent capability and further improving the stability of welding the tab 22 and the pole 12.

Each tab single chip comprises a cover part directly connected with the battery cell main body 21 and a welding part arranged on one side of the cover part far away from the battery cell main body 21, and the area of the overlapping part 3 is 80% -95% of the area of the welding part.

In the battery cell 100 of the embodiment of the utility model, the area of the overlapped part 3 is 80% -95% of the area of the welding part. Because the tab 22 needs to be folded along with assembly (as shown in fig. 1, two bare cells 2 are folded in half), if the overlapping portion 3 is too large, the tab 22 of the adjacent bare cell 2 is inserted into the adjacent other bare cell 2. Thereby causing the phenomena of short circuit, poor self-discharge and the like caused by cathode-anode contact. Therefore, the battery cell 100 of the embodiment of the utility model avoids the problem that the overlapping part 3 is too large and short circuit is easy to cause. In addition, the problem that the energy density of the battery cells 100 is affected by too large gaps between adjacent bare cells 2 due to too small overlapping portions 3 is avoided. Thus, the battery cell 100 of the embodiment of the utility model has the advantages of high safety performance and high energy density.

Specifically, the positive single tab includes a positive electrode covering portion directly connected to the battery cell main body 21 and a positive electrode welding portion disposed on a side of the positive electrode covering portion away from the battery cell main body 21, and an area of the first overlapping portion is 80% -95% of an area of the positive electrode welding portion. The negative single-sheet tab includes a negative electrode covering portion directly connected with the cell main body 21 and a negative electrode welding portion disposed at a side of the negative electrode covering portion away from the cell main body 21, and the area of the second overlapping portion is 80% -95% of the area of the negative electrode welding portion.

The cell main body 21 has a first surface 211 (for example, an upper surface shown in fig. 6) and a second surface 212 (for example, a lower surface shown in fig. 6) which are disposed opposite to each other in the thickness direction thereof, the battery end cap 1 is adjacent to the first surface 211, and a distance between the first side 31 of the tab 22 and the first surface 211 in the thickness direction of the battery end cap 1 is 0mm to 10mm.

In the battery cell 100 of the embodiment of the utility model, the distance between the first side 31 and the first surface 211 of the tab 22 in the thickness direction of the battery end cover 1 is 0mm-10mm. The distance between the pole 12 and the diaphragm of the battery cell 100 can be correspondingly reduced after the battery cell 100 is assembled due to the fact that the distance is too small, and then the diaphragm can be broken down when unstable current flows through the pole. And further, the influence of temperature rise of the structure on the diaphragm is reduced, the problem that the diaphragm is overheated and contracts is solved, and the risk of short circuit caused by the thermal contraction of the diaphragm is reduced. Therefore, the battery cell 100 of the embodiment of the utility model has the advantage of further improving the safety performance of the battery pack.

As shown in fig. 6 and 7, the electrical core 100 according to the embodiment of the present utility model further includes a protective adhesive layer 4, where the protective adhesive layer 4 includes a tab laying portion, and the tab laying portion is disposed on the second side.

According to the battery cell 100 disclosed by the embodiment of the utility model, the laying part of the arranged protective adhesive layer 4 is covered on the second side, and the electrode lug 22 can be further positioned through the protective adhesive layer 4, so that the problem that the electrode lug 22 is reversely inserted into the bare battery cell 2 can be prevented. Therefore, the battery cell 100 of the embodiment of the utility model has the advantage of further improving the safety performance of the battery pack.

The embodiment of the present utility model is not limited thereto, and for example, in other embodiments, the protective adhesive layer 4 includes a tab laying portion and an outer edge portion extending upward along an edge of the tab laying portion, the tab laying portion is disposed on the second side, and the outer edge portion is attached to the cell main body 21. Similarly, the battery cell 100 according to the embodiment of the utility model has the advantage of further improving the safety performance of the battery pack.

As shown in fig. 3 and 4, the post 12 includes a first post segment 121 and a second post segment 122 that are sequentially disposed along the thickness direction of the battery end cap 1, the outer diameter of the first post segment 121 is smaller than that of the second post segment 122, the first post segment 121 and the second post segment 122 form a limiting step at the junction, the first post segment 121 is disposed on the end cap body 11 in a penetrating manner, the second post segment 122 abuts on a side (e.g., a lower side as shown in fig. 3) of the end cap body 11 opposite to the tab 22, and the overlapping portion 3 is connected with the second post segment 122.

According to the battery cell 100 of the embodiment of the utility model, the pole 12 is divided into the first pole section 121 and the second pole section 122, and the limiting step is formed at the joint of the first pole section 121 and the second pole section 122, the second pole section 122 is abutted against the opposite side of the end cover body 11 to the pole lug 22, and the pole 12 can be limited through the end cover body 11. Thus, the battery cell 100 has the advantage of good structural stability.

Further, the battery in the present embodiment may be a rectangular aluminum case battery or a cylindrical battery.

The battery module according to the embodiment of the present utility model may include a plurality of the battery cells 100 of any one of the above. The plurality of battery cells 100 are assembled into a battery module in a serial or parallel manner.

Therefore, the battery module of the embodiment of the utility model improves the charging efficiency, the energy density and the assembly efficiency, and simultaneously reduces the material cost of the battery cell 100.

The battery pack of the embodiment of the utility model can comprise a battery box and the battery module according to the embodiment of the utility model, wherein the battery module is arranged in the battery box.

Therefore, the battery pack of the embodiment of the utility model improves the charging efficiency, the energy density and the assembly efficiency, and simultaneously reduces the material cost of the battery cell 100.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "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 being referred to 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 for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical 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 embodiments of the present utility model have been shown and described above, it will 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 may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A cell, comprising:

the battery end cover comprises an end cover body and a pole, and the pole is arranged on the end cover body in a penetrating way; and

each bare cell comprises a cell main body and a pole lug which are connected, the pole lugs of two adjacent bare cells form an overlapping part in the thickness direction orthogonal to the battery end cover, and the overlapping part is connected with the pole post.

2. The battery cell of claim 1, wherein the tabs of the same bare cell comprise a first tab and a second tab, the first tab and the second tab are disposed on the same side of the battery cell body, the posts comprise a first post and a second post disposed on the end cap body, the first tab and the second tab of the same bare cell are disposed at intervals in a length direction of the battery end cap, the first tabs of adjacent two bare cells are connected to form a first overlapping portion, the second tabs of adjacent two bare cells are connected to form a second overlapping portion, the first overlapping portion is connected to the first post, and the second overlapping portion is connected to the second post.

3. The cell of claim 2, wherein the first tab of one of the die cells and the first tab of the die cell adjacent thereto are symmetrically disposed, and wherein the second tab of one of the die cells and the second tab of the die cell adjacent thereto are symmetrically disposed;

and/or the first tab comprises a plurality of layers of positive single tab, and the positive single tab is arranged in a gathering and stacking mode;

and/or the second lug comprises a plurality of layers of negative single-piece lugs, and the plurality of layers of negative single-piece lugs are gathered and arranged in a laminated mode.

4. A cell according to claim 3, wherein the positive single tab of the plurality of layers is welded or bonded to form a positive tab and the negative single tab of the plurality of layers is welded or bonded to form a negative tab.

5. The cell of claim 1, wherein the overlap has oppositely disposed first and second sides along a thickness direction of the cell end cap, the first side having a solder pad that is soldered to the terminal post.

6. The cell of claim 5, wherein the tab comprises a plurality of layers of gathered and laminated tab monoliths, the projection of the welding area onto the outermost tab monoliths along the thickness direction of the battery end cap being on the outermost tab monoliths;

and/or each tab single chip comprises a covering part directly connected with the battery cell main body and a welding part arranged on one side of the covering part far away from the battery cell main body, wherein the area of the overlapping part is 80% -95% of the area of the welding part;

and/or the cell main body is provided with a first surface and a second surface which are oppositely arranged along the thickness of the cell end cover, the cell end cover is adjacent to the first surface, and the distance between the first side of the tab and the first surface in the thickness direction of the cell end cover is 0mm-10mm.

7. The cell of claim 5, further comprising a protective glue layer comprising a tab lay-up, the tab lay-up being disposed overlying the second side; or the protective adhesive layer comprises a tab laying part and an outer edge part which extends along the thickness direction of the battery end cover along the edge of the tab laying part, the tab laying part is arranged on the second side, and the outer edge part is attached to the battery core main body.

8. The cell of claim 1, wherein the post comprises a first post segment and a second post segment sequentially arranged along a thickness direction of the battery end cover, an outer diameter of the first post segment is smaller than an outer diameter of the second post segment, the first post segment and the second post segment form a limiting step at a connection position, the first post segment is arranged on the end cover body in a penetrating manner, the second post segment is abutted to one side of the end cover body opposite to the tab, and the overlapping portion is connected with the second post segment.

9. A battery module characterized by comprising a plurality of cells according to any one of claims 1-8.

10. A battery pack comprising a battery case and the battery module according to claim 9, the battery module being disposed in the battery case.