Battery cells, battery modules and battery packs

Abstract

The embodiments of the present invention provide a battery cell, a battery module and a battery pack. Among them, the battery cell of the embodiments of the present invention includes a battery cell shell, a pole, a connecting piece, a support plate and a bare battery cell. The battery cell shell has a battery cell cavity, and the wall surface on one side of the battery cell shell forms a pole mounting plate. The pole is installed on the pole mounting plate, and the inner wall of the pole mounting plate protrudes outward to form a bulge area; one end of the connecting piece is connected to the pole, and the other end of the connecting piece is bent toward the direction close to the pole mounting plate to form a pole lug connecting section, and the pole lug connecting section is arranged in the bulge area; the support plate is arranged between the connecting piece and the battery cell body, the pole lug extends and is welded on the connecting piece, and the support plate is fitted with the pole lug connecting section. Therefore, the battery cell according to the embodiments of the present invention has the advantages of improving battery density and assembly safety.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell and a battery module and a battery pack having the battery cell. Background Art

[0002] With the development of new energy vehicles, the demand for fast charging of batteries is increasing, and the demand for fast charging of battery cells is also growing. In related technologies, the bare battery cell is connected to the top cover through a connecting piece. The tabs of the bare battery cell are ultrasonically welded to the connecting piece, and then connected to the terminal through the connecting piece.

[0003] In the related art, when welding the pole ear, the pole ear and the connecting piece need to be pressed tightly. When subjected to force, the connecting piece is deformed, which can easily lead to welding explosion points. A support plate needs to be set to support the welding point. However, the support plate will occupy the internal space of the battery, resulting in a reduced utilization rate of the battery cells inside. Summary of the Invention

[0004] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide a battery cell having the advantages of increased battery density and assembly safety.

[0005] An embodiment of the present invention further provides a battery module.

[0006] An embodiment of the present invention further provides a battery pack.

[0007] The battery cell of the embodiment of the present invention includes a battery cell shell, a pole, a connecting piece, a support plate and a bare battery cell.

[0008] The battery cell shell has a battery cell cavity, and the wall surface on one side of the battery cell shell forms a pole mounting plate, the pole is inserted into the pole mounting plate, and the pole extends into the battery cell cavity, and the inner wall of the pole mounting plate protrudes outward to form a convex area; one end of the connecting piece is connected to the pole, and the other end of the connecting piece is bent toward the direction close to the pole mounting plate to form a pole ear connecting section, and the pole ear connecting section is arranged in the convex area; the bare battery cell includes a connected battery cell body and a pole ear, and a part of the pole ear protruding from the outside of the battery cell body forms a welding section, the battery cell body is arranged in the battery cell cavity, and the support plate is arranged between the connecting piece and the battery cell body, the pole ear extends and is welded to the connecting piece, and the support plate is fitted with the pole ear connecting section.

[0009] The battery cell of the embodiment of the present invention provides space for the support plate by protruding the inner wall of the terminal mounting plate outward to form a convex area, and bending the other end of the connecting piece toward the terminal mounting plate. This avoids the problem of low battery density caused by the support plate occupying space in the battery cell body, thereby increasing the height of the battery cell body. As a result, the battery cell of the embodiment of the present invention contributes to the advantage of improving battery density.

[0010] In addition, the support plate can isolate the welding site from the battery cell. On the one hand, it can provide space for the tabs to gather. On the other hand, it can isolate the heat generated by laser welding from being transferred to the diaphragm of the battery cell body, avoiding damage to the battery cell body.

[0011] Therefore, the battery cell of the embodiment of the present invention has the advantages of improved battery density and high assembly safety.

[0012] In some embodiments, the tab extends and is welded on a side of the connecting piece close to the pole mounting plate, and the welding section of the tab, the tab connecting section and the support plate are stacked in sequence along the height direction of the battery cell.

[0013] In some embodiments, the battery cell shell includes a shell and an end cover, the shell has an opening, the end cover is arranged on the opening, the end cover is arranged opposite to the pole mounting plate, the pole is passed through the pole mounting plate, and there is a gap between the pole mounting plate and the battery cell body, and the welding section, the tab connection section and the support plate are stacked in the gap along the height direction of the battery cell.

[0014] In some embodiments, the pole mounting plate includes a base plate and an outwardly convex insulating sealing cover, the base plate has a welding operation port, the insulating sealing cover is sealed on the welding operation port, and the welding operation port is arranged corresponding to the tab connection section.

[0015] In some embodiments, the area of ​​the base plate having the welding operation port has a limiting edge, and the limiting edge and the base plate form a limiting step. The insulating sealing cover includes an insulating cover and a sealing cover. The insulating cover is arranged between the sealing cover and the pole ear. The sealing cover is arranged on the insulating cover, and the insulating cover includes a main body cover part and a ring plate part extending outward along the circumference of the main body cover part. The main body cover part protrudes outward to form the convex area, and the edge of the sealing cover and the ring plate part both abut against the limiting step.

[0016] In some embodiments, the height of the insulating sealing cover protruding from the bottom plate is less than or equal to the height of the pole protruding from the bottom plate.

[0017] In some embodiments, the difference between the height of the insulating sealing cover protruding from the bottom plate and the height of the pole protruding from the bottom plate is 0 mm < B ≤ 3.2 mm.

[0018] In some embodiments, the height of the bending of the connecting piece is 1 mm-10 mm, and the distance between the bending part of the connecting piece and the pole is at least 8 mm.

[0019] In some embodiments, the support plate has a tab through-hole and a partition plate body, the edge of the support plate is fixed to the insulating inner wall surface of the battery cell shell, the tab is passed through the tab through-hole, and the partition plate body is fitted with the tab connecting section to be spaced between the connecting piece and the battery cell body.

[0020] In some embodiments, the support plate has a convex rib on a side facing the battery cell body, and the convex rib abuts against the battery cell body to form an electrical gap.

[0021] The battery module of the embodiment of the present invention includes a plurality of battery cells according to any one of the above-mentioned methods.

[0022] A battery pack according to an embodiment of the present invention includes a battery box and the battery module described above, wherein the battery module is disposed in the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of a battery cell according to an embodiment of the present invention.

[0024] Figure 2 yes Figure 1 Enlarged view at point A.

[0025] Figure 3 This is another cross-sectional view of the battery cell according to the embodiment of the present invention.

[0026] Figure 4 yes Figure 3 Enlarged view at B.

[0027] Figure 5 yes Figure 3 Enlarged view at C.

[0028] Figure 6 This is another cross-sectional view of the battery cell according to the embodiment of the present invention.

[0029] Figure 7 yes Figure 6 Enlarged view at D.

[0030] Figure 8 It is a three-dimensional diagram of a battery cell according to an embodiment of the present invention, omitting the insulating sealing cover.

[0031] Figure 94 is a perspective view of a connecting piece according to an embodiment of the present invention.

[0032] Figure 10 FIG. 4 is an exploded view of a battery cell according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] Battery cell 100;

[0035] Battery cell housing 1; housing 11; opening 111; end cover 12; pole mounting plate 13; bottom plate 131; welding operation port 1311; limiting edge 1312; insulating sealing cover 132; insulating cover 1321; sealing cover 1322;

[0036] Pole 2;

[0037] Connecting piece 3; Tab connecting section 31;

[0038] Support plate 4; tab through hole 41; partition plate 42; rib 43;

[0039] Bare battery cell 5; battery cell body 51; tab 52. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] Reference below Figures 1-10 The battery cell 100, battery module and battery pack according to the embodiment of the present invention are described.

[0042] The battery cell 100 of the embodiment of the present invention includes a battery cell shell 1 , a pole 2 , a connecting piece 3 , a support plate 4 and a bare battery cell 5 .

[0043] The battery cell shell 1 has a battery cell cavity, and the wall surface on one side of the battery cell shell 1 forms a pole mounting plate 13, the pole 2 is inserted into the pole mounting plate 13, and the inner wall of the pole mounting plate 13 protrudes outward to form a convex area; one end of the connecting piece 3 is connected to the pole 2, and the other end of the connecting piece 3 is bent toward the direction close to the pole mounting plate 13 to form a pole ear connection section 31, and the pole ear connection section 31 is arranged in the convex area; the bare battery cell 5 includes a connected battery cell body 51 and a pole ear 52, and a part of the pole ear 52 protrudes outside the battery cell body 51 to form a welding section. The battery cell body 51 is arranged in the battery cell cavity, and the support plate 4 is arranged between the connecting piece 3 and the battery cell body 51, the pole ear 52 extends and is welded to the connecting piece 3, and the support plate 4 is in contact with the pole ear connection section 31.

[0044] The battery cell 100 of the embodiment of the present invention forms a convex area by protruding the inner wall of the pole mounting plate 13 outward, and bending the other end of the connecting piece 3 toward the pole mounting plate 13 to provide space for the support plate 4. This avoids the problem of low battery density caused by the support plate 4 occupying the space of the battery cell body 51. While the overall height of the battery cell housing 1 remains unchanged, the height of the battery cell body 51 can be increased. As a result, the battery cell 100 of the embodiment of the present invention contributes to the advantage of improving battery density.

[0045] In addition, the support plate 4 provided can separate the welding site and the battery cell 100. On the one hand, it can provide space for the tabs 52 to gather together. On the other hand, it can isolate the heat generated by laser welding from being transferred to the diaphragm of the battery cell body 51, thereby avoiding damage to the battery cell body 51.

[0046] Therefore, the battery cell 100 according to the embodiment of the present invention has the advantages of improving battery density and assembly safety.

[0047] For ease of description, the following Figure 1 The up and down directions in the figure are used as the height directions of the battery cell 100, wherein: Figure 1 The bottom of the upper battery cell 100, Figure 1 Specifically, the other end of the connecting piece 3 is bent upward to form a tab connecting section 31.

[0048] Optionally, the connecting piece 3 is an integrally bent structure. The tab 52 can be fixed to the tab connecting section 31 by laser welding.

[0049] Optionally, the pole 2 extends into the cell cavity.

[0050] Optionally, the battery cell body 51 may be a wound core or laminated cell structure.

[0051] like Figure 7 and Figure 8 As shown, the tab 52 extends and is welded to one side of the connecting piece 3 close to the pole mounting plate 13 , and the welding section of the tab 52 , the connecting piece 3 and the support plate 4 are stacked in sequence along the height direction of the battery cell 100 .

[0052] In the battery cell 100 of the embodiment of the present invention, the tab 52 is extended and welded to the side of the connecting piece 3 near the pole mounting plate 13. That is, the welding section of the tab 52 is also located in the convex area. This also reduces the space occupied by the tab 52 after stacking the tabs 52 on the battery cell body 51, which helps to increase the installation height of the battery cell 100. In turn, the battery cell 100 has the advantage of further improving the energy density of the battery.

[0053] like Figure 1 and Figure 8As shown, the battery cell case 1 includes a shell 11 and an end cover 12. The shell 11 has an opening 111, and the end cover 12 can be installed on the opening 111. The end cover 12 and the pole mounting plate 13 are arranged opposite each other in the height direction of the battery cell 100. The pole 2 is installed on the pole mounting plate 13. There is a gap between the pole mounting plate 13 and the battery cell body 51. The welding section, connecting piece 3 and support plate 4 are stacked in the gap along the height direction of the battery cell 100. It can be understood that the pole 2 is installed on the bottom plate 131 of the shell 11, rather than on the end cover 12.

[0054] In the battery cell 100 of the embodiment of the present invention, the electrode 2 is disposed on the bottom plate 131 of the housing 11. This eliminates the need for a support plate and a lower plastic structure at the bottom of the battery cell 100, further reducing the space occupied by the housing 11. Thus, the battery cell 100 of the embodiment of the present invention helps improve the internal space utilization of the battery cell 100, thereby increasing the energy density of the battery cell 100.

[0055] Optionally, the battery cell shell 1 may include a metal shell 11 and an insulating layer attached to the inner wall surface of the metal shell 11 (for example, an aluminum shell).

[0056] Specifically, when this structure does not have a bottom support sheet, the space saved is: bottom support sheet thickness + (light aluminum plate thickness - bottom cover thickness) + (conventional lower plastic thickness - A). Figure 5 As shown in the figure, A is the thickness of the lower plastic, and the range of A can be basically controlled within 1.5-3mm. After calculation, the space saving range is about 3-6mm.

[0057] like Figure 8 and Figure 10 As shown, the pole mounting plate 13 includes a base plate 131 and an outwardly projecting insulating sealing cover 132. The base plate 131 has a welding operation opening 1311. The insulating sealing cover 132 seals the welding operation opening 1311. The welding operation opening 1311 is provided corresponding to the tab connection section 31. It is understood that the tab connection section 31 is welded through the welding operation opening 1311. After the welding operation is completed, the welding operation opening 1311 is sealed by the insulating sealing cover 132.

[0058] In the battery cell 100 according to the embodiment of the present invention, the electrode mounting plate 13 is divided into a base plate 131 and an outwardly protruding insulating sealing cover 132, and the insulating sealing cover 132 is sealed on the welding operation opening 1311. During welding, the tab connection section 31 can be welded through the welding operation opening 1311. As a result, the battery cell 100 according to the embodiment of the present invention has the advantage of high operational convenience.

[0059] Optionally, the welding section may be arranged flush with the bottom plate 131 .

[0060] like Figure 8 and Figure 10 As shown, the area of ​​the bottom plate 131 having the welding operation port 1311 has a limiting edge 1312, and the limiting edge 1312 and the bottom plate 131 form a limiting step. The insulating sealing cover 132 includes an insulating cover 1321 and a sealing cover 1322. The insulating cover 1321 is arranged between the sealing cover 1322 and the pole ear 52, and the sealing cover 1322 is arranged on the insulating cover 1321. The insulating cover 1321 includes a main body cover and a ring plate portion extending outward along the circumference of the main body cover. The main body cover protrudes outward to form the convex area, and the edge and the ring plate portion of the sealing cover 1322 both abut against the limiting step.

[0061] The battery cell 100 of the embodiment of the present invention has a limiting edge 1312 in the area where the welding operation port 1311 is provided on the bottom plate 131. The limiting edge 1312 and the bottom plate 131 form a limiting step. The edge and the ring plate portion of the sealing cover 1322 are both in contact with the limiting step, which can improve the stability of the installation of the insulating sealing cover 132.

[0062] Optionally, the insulating cover 1321 is made of insulating material, such as plastic, rubber, etc., to prevent the tab 52 from being electrically connected to the outside world and to provide insulation. The insulating cover 1321 may also have a certain degree of elasticity.

[0063] like Figure 4 and Figure 7 As shown, the height of the insulating sealing cover 132 protruding from the bottom plate 131 is less than or equal to the height of the terminal 2 protruding from the bottom plate 131. While saving internal space in the battery cell housing 1, the size of the entire battery cell 100 is not increased. As a result, the battery cell 100 of the embodiment of the present invention improves the battery density of the battery cell 100 without increasing the size of the entire battery cell 100.

[0064] like Figure 7 As shown, the difference between the height of the insulating sealing cover 132 protruding from the bottom plate 131 and the height of the pole 2 protruding from the bottom plate 131 is 0 mm < B ≤ 3.2 mm.

[0065] The battery cell 100 of the embodiment of the present invention has the advantage of high battery density by setting the height difference between the protrusion height of the insulating sealing cover 132 and the protrusion height of the pole 2 from the bottom plate 131 to 0mm<B≤3.2mm.

[0066] Optionally, the height difference between the insulating sealing cover 132 protruding from the base plate 131 and the height of the pole 2 protruding from the base plate 131 is 0 mm, 0.1 mm, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3.0 mm, 3.1 mm or 3.2 mm.

[0067] The height of the bending of the connecting piece 3 is 1 mm to 10 mm, and the distance between the bending part of the connecting piece 3 and the pole 2 is at least 8 mm.

[0068] Optionally, the bending height of the connecting piece 3 is 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 8.5mm, 9.0mm, 9.5mm or 10.0mm.

[0069] like Figure 10 As shown, the support plate 4 has a tab through-hole 41 and a partition plate body 42. The edge of the support plate 4 is fixed to the insulating inner wall surface of the battery cell shell 1. The tab 52 is passed through the tab through-hole 41. The partition plate body 42 is fitted with the tab connecting section 31 so as to be spaced between the connecting piece 3 and the battery cell body 51.

[0070] In the battery cell 100 of the embodiment of the present invention, the partition plate 42 is fitted with the tab connection section 31 so as to be spaced between the connection sheet 3 and the battery cell body 51, thereby avoiding the problem of a gap occupying the space of the battery cell body 51. As a result, the battery cell 100 further improves the battery density.

[0071] The tab through-hole 41 may correspond to the base of the tab. Specifically, the base of the tab is gathered together, and then passed through the tab through-hole 41 and extended to the wall of the tab connecting section 31 on the side close to the rear bottom plate 131 for welding.

[0072] One end of the connecting piece 3 is sleeved on the pole 2 .

[0073] In the battery cell 100 of the embodiment of the present invention, by sleeve-mounting one end of the connecting piece 3 onto the terminal 2, it can be understood that at least a portion of the connecting piece 3 is collinear with the terminal 2. Compared with a method of fixing the connecting piece 3 to the end of the terminal 2, the space occupied by the connecting piece 3 and the terminal 2 within the battery cell case 1 can be greatly reduced. Therefore, the battery cell 100 has the advantage of improving the energy density of the battery cell 100.

[0074] Optionally, the edge of the support plate 4 is fixed to the insulating inner wall surface of the battery cell shell 1 by heat melting.

[0075] The support plate 4 has a convex rib 43 on a side facing the battery cell body 51 , and the convex rib 43 abuts against the battery cell body 51 .

[0076] The battery cell 100 of the embodiment of the present invention can offset the downward pressure during laser welding and isolate the heat generated during laser welding by providing a rib 43 on the side of the support plate 4 facing the battery cell body 51, thereby protecting the battery cell body 51.

[0077] There are a plurality of ribs 43 , and the ribs 43 are spaced apart from each other along the longitudinal extension direction of the support plate 4 .

[0078] The battery module according to the embodiment of the present invention includes a plurality of battery cells 100 according to any one of the above items.

[0079] Therefore, the battery module of the embodiment of the present invention has the advantages of improved battery density and assembly safety.

[0080] A battery pack according to an embodiment of the present invention includes a battery box and a battery module according to the above, wherein the battery module is disposed in the battery box.

[0081] Therefore, the battery pack according to the embodiment of the present invention has the advantages of improved battery density and assembly safety.

[0082] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0084] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0085] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0086] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0087] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A battery cell shell and a pole, wherein the battery cell shell has a battery cell cavity, a wall surface on one side of the battery cell shell forms a pole mounting plate, the pole is passed through the pole mounting plate, and the inner wall of the pole mounting plate protrudes outward to form a convex area; A connecting piece, one end of which is connected to the pole, and the other end of which is bent toward the pole mounting plate to form a tab connecting section, wherein the tab connecting section is disposed in the convex area; A support plate and a bare cell, wherein the bare cell comprises a cell body and a tab connected to each other, and a portion of the tab protruding from the cell body forms a welding section, the cell body is disposed in the cell cavity, the support plate is disposed between the connecting piece and the cell body, the tab extends and is welded to the connecting piece, and the support plate is in contact with the tab connection section; The pole mounting plate includes a bottom plate and an outwardly convex insulating sealing cover. The bottom plate has a welding operation port. The insulating sealing cover is sealed on the welding operation port. The welding operation port is arranged corresponding to the pole tab connection section.

2. The battery cell according to claim 1, characterized in that The tab is extended and welded to a side of the connecting piece close to the pole mounting plate, and the welding section of the tab, the tab connecting section and the support plate are stacked in sequence along the height direction of the battery cell.

3. The battery cell according to claim 2, characterized in that The battery cell shell includes a shell and an end cover, the shell has an opening, the end cover is arranged on the opening, the end cover is arranged opposite to the pole mounting plate, the pole is passed through the pole mounting plate, and there is a gap between the pole mounting plate and the battery cell body, and the welding section, the tab connection section and the support plate are stacked in the gap along the height direction of the battery cell.

4. The battery cell according to claim 3, characterized in that The area of ​​the bottom plate having the welding operation port has a limiting edge, and the limiting edge and the bottom plate form a limiting step. The insulating sealing cover includes an insulating cover and a sealing cover. The insulating cover is arranged between the sealing cover and the pole ear. The sealing cover is arranged on the insulating cover, and the insulating cover includes a main body cover part and a ring plate part extending outward along the circumference of the main body cover part. The main body cover part protrudes outward to form the convex area, and the edge of the sealing cover and the ring plate part both abut against the limiting step.

5. The battery cell according to claim 4, characterized in that: The height of the insulating sealing cover protruding from the bottom plate is less than or equal to the height of the pole protruding from the bottom plate.

6. The battery cell according to claim 5, characterized in that The difference between the height of the insulating sealing cover protruding from the bottom plate and the height of the pole protruding from the bottom plate is 0mm<B≤3.2mm.

7. The battery cell according to claim 1, characterized in that The height of the bending of the connecting piece is 1mm-10mm, and the distance between the bending part of the connecting piece and the pole is at least 8mm; And / or, the support plate has a tab through-hole and a partition plate body, the edge of the support plate is fixed to the insulating inner wall surface of the battery cell shell, the tab is passed through the tab through-hole, and the partition plate body is fitted with the tab connecting section so as to be spaced between the connecting piece and the battery cell body.

8. The battery cell according to claim 1, characterized in that The support plate has a convex rib on one side facing the battery cell body, and the convex rib abuts against the battery cell body to form an electrical gap; And or, one end of the connecting piece is sleeved on the pole.

9. A battery module, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The invention comprises a battery box and the battery module according to claim 9, wherein the battery module is arranged in the battery box.

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