Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. The battery cell comprises a shell, a pole post, a pole group, a connecting sheet and an insulating sealing assembly, two welding through holes and two pole mounting holes are formed in the first side wall of the shell; the pole connecting parts of the two connecting sheets respectively extend into the corresponding welding through holes; the two insulation sealing assemblies are arranged in the two welding through holes respectively to seal the welding through holes, each insulation sealing assembly comprises a sealing plate and an insulation plate, the sealing plate is provided with a clamping groove, the insulation plate is provided with a clamping protrusion, and the clamping grooves and the clamping protrusions are matched in a clamping mode; the maximum width of the notch of the clamping groove is smaller than the maximum width of the groove bottom of the clamping groove; a disconnection groove is formed in the middle of the clamping protrusion and divides the clamping protrusion into two or more clamping protrusion subsections, and the clamping protrusion subsections are suitable for being inwards folded and deformed towards the disconnection groove in the clamping process. According to the utility model, the problems that the sealing plate and the insulating plate are not firmly connected and are easy to separate can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in the field of electric vehicles.

[0003] The cell cover plate assembly is an important part of the cell, including structures such as a cover plate, pole columns, connecting pieces, a sealing plate, and an insulating plate.

[0004] Among them, the sealing plate plays an important role in the sealing performance and insulating performance of the cell cover plate assembly. In traditional cells, the connection strength between the sealing plate and the insulating plate is low. After the cell works in a vibrating scenario, the connection between the sealing plate and the insulating plate is likely to fall off, thus affecting the sealing performance and insulating performance of the cell. Summary of the Utility Model

[0005] In view of this, the utility model provides a battery cell and a battery pack to solve the problem that the connection between the sealing plate and the insulating plate is not firm and is prone to detachment.

[0006] In a first aspect, the utility model provides a battery cell, which includes a housing, two pole columns, a pole group, two connecting pieces, and two insulating and sealing components. The first side wall of the housing is provided with two welding through holes and two pole column mounting holes; the two pole columns are respectively arranged in the two pole column mounting holes; the pole group is provided with pole tabs corresponding to each pole column; the connecting piece includes a pole column connecting portion and a pole tab connecting portion. The pole column connecting portion is connected to one pole column, and the pole column connecting portions of the two connecting pieces respectively extend into the corresponding welding through holes to complete the welding of the connecting piece and the pole tab in the welding through holes; the two insulating and sealing components are respectively arranged in the two welding through holes to close the welding through holes. The insulating and sealing component includes a sealing plate and an insulating plate. The sealing plate is provided with a clamping groove, and the insulating plate is provided with a clamping protrusion. The clamping groove and the clamping protrusion are in clamping fit; the maximum width of the notch of the clamping groove is smaller than the maximum width of the bottom of the clamping groove; a breaking groove is provided in the middle of the clamping protrusion, and the breaking groove divides the clamping protrusion into two or more clamping protrusion parts, and each clamping protrusion part is adapted to deform inward toward the breaking groove during the clamping process.

[0007] Beneficial effects: The battery cell provided by the utility model has two welding through holes provided in the shell. After the pole connecting parts of the two connecting sheets are respectively welded to the two poles, the two pole lug connecting parts respectively extend into the corresponding welding through holes. In the welding through holes, the pole lug connecting part and the pole lug of the pole group correspond to each other. The pole lug connecting part and the pole lug are welded through the welding through holes. Since the shell is provided with two welding through holes, the two welding through holes are spaced apart on the shell, so that the shell between the two welding through holes is still in a connected state, and the structural strength of the first side wall of the shell itself can be ensured. The battery cell provided by the utility model can insulate the pole lug and the shell by providing an insulating sealing assembly on the welding through hole. Since the sealing plate is provided with a snap-in groove and the insulating plate is provided with a snap-in protrusion, the sealing plate and the insulating plate can be quickly snap-fitted and assembled. Because the maximum width of the notch of the snap-in groove is smaller than the maximum width of the groove bottom of the snap-in groove, after the snap-in protrusion is snapped into the snap-in groove, the snap-in groove can limit the snap-in protrusion to prevent the snap-in protrusion from detaching from the snap-in groove, thereby ensuring a reliable and firm connection between the sealing plate and the insulating plate. Since the snap-in protrusion is provided with a disconnection groove, the snap-in protrusion is divided into two or more snap-in protrusion sections. In this way, during the snap-in connection between the snap-in protrusion and the snap-in groove, each snap-in protrusion section can be deformed and gathered in the direction of the disconnection groove, so that each snap-in protrusion section can be smoothly snapped into the snap-in groove. Since the snap-in protrusion is divided into two or more snap-in protrusion sections by the disconnection groove, while achieving the convenience of improving the assembly of the snap-in protrusion and the snap-in groove, the material used for the insulating plate can be reduced, which is beneficial to reducing the overall weight and production cost of the battery cell.

[0008] In an optional embodiment, the snap-in groove includes a first groove body and a second groove body, the first groove body is a blind groove, the second groove body is a through groove, the maximum width of the first groove body is greater than the maximum width of the second groove body; the side wall of the second groove body is retracted inward in a direction away from the first groove body to form a first guide slope, and the groove opening of the second groove body is provided with a chamfered corner.

[0009] In an optional implementation, the included angle between the first guide slope and the thickness direction of the sealing plate is α, 10°≤α≤80°.

[0010] In an optional embodiment, the thickness of the sealing plate is T, 1.2 mm ≤ T ≤ 1.8 mm; the depth of the first groove body is t1, 0.25 mm ≤ t1 ≤ 0.55 mm; the depth of the second groove body is t2, 0.25 mm ≤ t2 ≤ 0.55 mm.

[0011] In an alternative embodiment, the snap projection includes a first column section and a second column section. The structure of the first column section is adapted to the structure of the first groove body, and the structure of the second column section is adapted to the structure of the second groove body; the side wall of the second column section expands outward in a direction away from the insulating plate to form a second guiding inclined surface, and an inverted chamfer is provided at the outer edge of the top of the second column section, and the inverted chamfer is adapted to the rounded corner of the second groove body.

[0012] In an alternative embodiment, the angle between the second guiding inclined surface and the axis of the second column section is β, and β = α.

[0013] In an alternative embodiment, the minimum distance from the outer wall of the root of the first column section to the disconnection groove is W1, where 0.35 mm ≤ W1 ≤ 1.2 mm; the width by which the outer wall of the second column section protrudes from the top of the first column section is W2, and W2 ≥ 0.5 mm.

[0014] In an alternative embodiment, the disconnection groove is a straight groove, which divides the snap projection into two snap projection parts. The width of the disconnection groove is W3, where 1 mm ≤ W3 ≤ 5 mm; at least three snap grooves are arranged at intervals along the length direction of the sealing plate.

[0015] In an alternative embodiment, a counterbore is provided around the welding through hole. The size of the insulating plate is smaller than the size of the sealing plate, so that a step is formed around the insulating plate and the sealing plate, and the step and the counterbore cooperate.

[0016] In a second aspect, the present utility model further provides a battery pack, including the battery cells according to any one of the above technical solutions.

[0017] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of an insulating and sealing assembly in a battery cell according to an embodiment of the present utility model;

[0020] Figure 2 It is Figure 1 a cross-sectional view taken along A-A in

[0021] Figure 3 It is Figure 1 a schematic structural diagram of the sealing plate in

[0022] Figure 4 is a sectional view taken along B-B in Figure 3 ;

[0023] Figure 5 is Figure 1 a schematic structural view of the insulating plate in

[0024] Figure 6 is a sectional view taken along C-C in Figure 5 ;

[0025] Figure 7 is a schematic structural view of the tab and the connecting piece in an assembled state;

[0026] Figure 8 is Figure 7 a schematic structural view of the structure shown in and the housing in an assembled state;

[0027] Figure 9 is Figure 8 a schematic structural view of the structure shown in after welding the tab and the connecting piece;

[0028] Figure 10 is Figure 9 a partial enlarged view at I in ;

[0029] Figure 11 is a schematic structural view of a battery cell according to an embodiment of the present invention in a fully assembled state.

[0030] Description of reference numerals:

[0031] 1. Housing; 101. Welding through hole; 1011. Counterbore; 2. Terminal; 3. Electrode group; 301. Tab; 4. Connecting piece; 401. Terminal connecting part; 402. Tab connecting part; 5. Sealing plate; 501. Clamping groove; 5011. First groove body; 5012. Second groove body; 50121. First guiding inclined surface; 50122. Chamfer; 6. Insulating plate; 61. Disconnecting groove; 62. Clamping projection distribution; 601. Clamping projection; 6011. First column section; 60111. Inclined chamfer; 6012. Second column section; 60121. Second guiding inclined surface; 602. Step; 7. Liquid injection hole. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 11 , the embodiments of the present utility model will be described.

[0034] According to an embodiment of the present utility model, on the one hand, a battery cell is provided, which includes a housing 1, two pole columns 2, a pole group 3, two connecting plates 4, and two insulating and sealing components. The first side wall of the housing 1 is provided with two welding through holes 101 and two pole column mounting holes; the two pole columns 2 are respectively arranged in the two pole column mounting holes; the pole group 3 is provided with pole tabs 301 corresponding to each pole column 2; the connecting plate 4 includes a pole column connecting portion 401 and a pole tab connecting portion 402, the pole column connecting portion 401 is connected to one pole column 2, and the pole column connecting portions 401 of the two connecting plates 4 respectively extend into the corresponding welding through holes 101 to complete the welding of the connecting plate 4 and the pole tab 301 in the welding through holes 101; the two insulating and sealing components are respectively arranged in the two welding through holes 101 to seal the welding through holes 101, and the insulating and sealing components include a sealing plate 5 and an insulating plate 6; the sealing plate 5 is provided with a clamping groove 501, and the insulating plate 6 is provided with a clamping protrusion 601, and the clamping groove 501 and the clamping protrusion 601 are in clamping fit; the maximum width of the notch of the clamping groove 501 is smaller than the maximum width of the bottom of the clamping groove 501; a disconnection groove 61 is provided in the middle of the clamping protrusion 601, and the disconnection groove 61 divides the clamping protrusion 601 into two or more clamping protrusion parts 62, and each clamping protrusion part 62 is adapted to deform inwards towards the disconnection groove 61 during the clamping process.

[0035] For the battery cell provided by the embodiment of the present utility model, since the housing 1 is provided with two welding through holes 101, after the pole column connecting portions 401 of the two connecting plates 4 are respectively welded to the two pole columns 2, the two pole tab connecting portions 402 respectively extend into the corresponding welding through holes 101. In the welding through holes 101, the pole tab connecting portions 402 and the pole tabs 301 of the pole group 3 are in corresponding positions, and through the welding through holes 101, the pole tab connecting portions 402 and the pole tabs 301 are welded. Since the housing 1 is provided with two welding through holes 101, and the two welding through holes 101 are arranged at intervals on the housing 1, the housing 1 between the two welding through holes 101 is still in a connected state, which can ensure the structural strength of the first side wall of the housing 1 itself.

[0036] The battery cell provided by the embodiment of the present utility model can insulate the tab 301 and the housing 1 by providing an insulating and sealing assembly on the welding through-hole 101. Since the clamping groove 501 is provided on the sealing plate 5 and the clamping protrusion 601 is provided on the insulating plate 6, the sealing plate 5 and the insulating plate 6 can be quickly clamped and assembled. Also, because the maximum width of the notch of the clamping groove 501 is smaller than the maximum width of the bottom of the clamping groove 501, after the clamping protrusion 601 is inserted into the clamping groove 501, the clamping groove 501 can form a limit on the clamping protrusion 601 to prevent the clamping protrusion 601 from disengaging from the clamping groove 501, ensuring a reliable and firm connection between the sealing plate 5 and the insulating plate 6. Since the clamping protrusion 601 is provided with a disconnection groove 61, dividing the clamping protrusion 601 into two or more clamping protrusion parts 62, in this way, during the process of the clamping protrusion 601 being clamped with the clamping groove 501, each clamping protrusion part 62 can deform and contract towards the disconnection groove 61, facilitating each clamping protrusion part 62 to be smoothly inserted into the clamping groove 501. Since the clamping protrusion 601 is separated into two or more clamping protrusion parts 62 by the disconnection groove 61, while improving the convenience of the assembly of the clamping protrusion 601 and the clamping groove 501, the material used for the insulating plate 6 can be reduced, which is beneficial to reducing the overall weight and production cost of the battery cell.

[0037] In some embodiments, the clamping groove 501 includes a first groove body 5011 and a second groove body 5012. The first groove body 5011 is a blind groove, and the second groove body 5012 is a through groove. The maximum width of the first groove body 5011 is greater than the maximum width of the second groove body 5012; the side wall of the second groove body 5012 is inwardly retracted along the direction away from the first groove body 5011 to form a first guiding inclined surface 50121, and a chamfer 50122 is provided at the notch of the second groove body 5012.

[0038] Specifically, the bottom of the first groove body 5011 does not penetrate the sealing plate 5 to form a blind groove. One end of the second groove body 5012 penetrates the sealing plate 5, and the other end communicates with the first groove body 5011 to form a through groove. The notch of the second groove body 5012 is the clamping entrance of the clamping groove 501. The maximum width of the first groove body 5011 is greater than the maximum width of the second groove body 5012, so that a limiting shoulder is formed at the connection between the first groove body 5011 and the second groove body 5012. In this way, after the clamping protrusion 601 with a matching structure is clamped with the clamping groove 501, it can play a role in anti-disengagement and limiting.

[0039] Regarding the maximum width of the first groove body 5011, that is, when the cross-section of the first groove body 5011 along its depth direction is circular, the maximum width of the first groove body 5011 is its inner diameter; similarly, when the cross-section of the second groove body 5012 along its depth direction is circular, the maximum width of the second groove body 5012 is its inner diameter.

[0040] By providing a chamfer 50122 at the notch of the second groove 5012, it is convenient for the clamping protrusion 601 to be inserted. By setting the side wall of the second groove 5012 as an inwardly converging first guiding inclined surface 50121, during the insertion process of the clamping protrusion 601 into the clamping groove 501, the clamping protrusion 601 is guided and squeezed by the first guiding inclined surface 50121, causing the clamping protrusion 601 to deform inwardly and contract towards the disconnection groove 61. At the same time, under the guiding action of the first guiding inclined surface 50121, it can be smoothly inserted into the first groove body 5011. After the clamping protrusion 601 reaches the first groove body 5011, since the maximum width of the first groove body 5011 is greater than the maximum width of the second groove body 5012, that is, the passing area of the first groove body 5011 is larger, the clamping protrusion 601 is no longer subjected to extrusion and deforms and resets in the direction away from the disconnection groove 61. Thus, the clamping protrusion 601 and the clamping groove 501 are successfully clamped.

[0041] In some embodiments, the angle between the first guiding inclined surface 50121 and the thickness direction of the sealing plate 5 is α, and 10° ≤ α ≤ 80°.

[0042] By controlling the angle α between the first guiding inclined surface 50121 and the thickness direction of the sealing plate 5 within the range of 10° to 80°, while the first guiding inclined surface 50121 plays a guiding role, the processing difficulty of the clamping groove 501 can be reduced.

[0043] In some embodiments, the thickness of the sealing plate 5 is T, and 1.2 mm ≤ T ≤ 1.8 mm; the depth of the first groove body 5011 is t1, and 0.25 mm ≤ t1 ≤ 0.55 mm; the depth of the second groove body 5012 is t2, and 0.25 mm ≤ t2 ≤ 0.55 mm.

[0044] By controlling the thickness T of the sealing plate 5 within the range of 1.2 mm to 1.8 mm, not only can the structural strength of the sealing plate 5 itself be ensured, especially the structural strength at the location where the clamping groove 501 is provided, to ensure the fitting strength between the clamping groove 501 and the clamping protrusion 601, enabling the sealing plate 5 to fit tightly with the insulating part, but also the weight and cost of the sealing plate 5 can be controlled within a reasonable range, and the space occupied by the sealing plate 5 can be reduced.

[0045] In some embodiments, the clamping protrusion 601 includes a first column section 6011 and a second column section 6012. The structure of the first column section 6011 is adapted to the structure of the first groove body 5011, and the structure of the second column section 6012 is adapted to the structure of the second groove body 5012; the side wall of the second column section 6012 expands outward along the direction away from the insulating plate 6 to form a second guiding inclined surface 60121, and an inclined chamfer 60111 is provided at the outer edge of the top of the second column section 6012, and the inclined chamfer 60111 is adapted to the chamfer 50122 of the second groove body 5012.

[0046] Since the snap groove 501 is provided with a first groove body 5011 and a second groove body 5012, correspondingly, the snap projection 601 is provided with a first column section 6011 and a second column section 6012. Among them, the first column section 6011 and the first groove body 5011 are structurally adapted, and the second column section 6012 and the second groove body 5012 are structurally adapted, which can improve the adaptability between the snap groove 501 and the snap projection 601, improve the assembly convenience of the snap projection 601 and the snap groove 501, ensure a reliable limiting effect between the two, and thus improve the connection firmness between the sealing plate 5 and the insulating plate 6.

[0047] Specifically, in some embodiments, the cross-section of the first groove body 5011 along its depth direction is circular, and the cross-section of the second groove body 5012 along its depth direction is circular. The first column section 6011 of the correspondingly adapted snap projection 601 is a cylindrical structure with a disconnection groove 61 in the middle, and the second column section 6012 of the snap projection 601 is a frustum structure with a disconnection groove 61 in the middle.

[0048] In some embodiments, the angle between the second guiding inclined surface 60121 and the axis of the second column section 6012 is β, and β = α.

[0049] Since there is an angle β between the outer wall of the second column section 6012 and the axis of the second column section 6012, that is, the outer wall of the second column section 6012 is also an inclined surface. At the same time, since β = α, that is, the inclination angle of the outer wall of the second column section 6012 is the same as the inclination angle of the second groove body 5012. In this way, the guiding effect between the snap projection 601 and the snap groove 501 can be improved, as well as the adaptability and assembly convenience between the snap projection 601 and the snap groove 501.

[0050] In some embodiments, the minimum distance from the outer wall at the root of the first column section 6011 to the disconnection groove 61 is W1, and 0.35 mm ≤ W1 ≤ 1.2 mm; the width by which the outer wall of the second column section 6012 protrudes from the top of the first column section 6011 is W2, and W2 ≥ 0.5 mm.

[0051] Specifically, in some embodiments, the disconnection groove 61 penetrates through the first column section 6011 and the second column section 6012 and extends to the body of the insulating plate 6. By controlling the minimum distance W1 between the outer wall at the root of the first column section 6011 and the disconnection groove 61 within the range of 0.35 mm to 1.2 mm, the structural strength of the first column section 6011 can be ensured, which is convenient for the processing of the snap projection 601; by controlling the width W2 by which the outer wall of the first column section 6011 protrudes from the top of the second column section 6012 within the range of being greater than or equal to 0.5 mm, the limiting and anti-disengagement effect between the snap projection 601 and the snap groove 501 after being snapped can be ensured.

[0052] In some embodiments, the disconnect groove 61 is a straight groove, which divides the clamping protrusion 601 into two clamping protrusion parts 62. The width of the disconnect groove 61 is W3, and 1 mm ≤ W3 ≤ 5 mm; at least three clamping grooves 501 are arranged at intervals along the length direction of the sealing plate 5.

[0053] In this embodiment, the disconnect groove 61 is a straight groove. Along the radial direction of the clamping protrusion 601, the disconnect groove 61 penetrates through both sides of the clamping protrusion 601, dividing the clamping protrusion 601 into two clamping protrusion parts 62. The width of the disconnect groove 61 is W3, that is, the interval between the two clamping protrusion parts 62 is W3. By controlling the width W3 of the disconnect groove 61 within the range of 1 mm to 5 mm, the structural strength of the clamping protrusion part 62 can be ensured, and the clamping protrusion part 62 has sufficient deformation space, which is convenient for the clamping protrusion 601 to be smoothly clamped into the clamping groove 501.

[0054] In some other embodiments, the disconnect groove 61 is Y-shaped, which divides the clamping protrusion 601 into three clamping protrusion parts 62.

[0055] In this embodiment, three clamping grooves 501 are arranged at intervals along the length direction of the sealing plate 5. In this way, the connection strength between the insulating plate 6 and the sealing plate 5 within the full length range can be ensured, and the firm connection between the sealing plate 5 and the insulating plate 6 can be ensured.

[0056] In some embodiments, a counterbore 1011 is provided around the welding through hole 101. The size of the insulating plate 6 is smaller than that of the sealing plate 5, so that a step 602 is formed at the peripheries of the insulating plate 6 and the sealing plate 5, and the step 602 cooperates with the counterbore 1011.

[0057] By providing a counterbore 1011 around the welding through hole 101 and forming a step 602 between the insulating plate 6 and the sealing plate 5, a limiting fit can be formed during assembly, which is convenient for the positioning and assembly between the insulating and sealing assembly and the welding through hole 101, and is beneficial to improving the assembly efficiency and assembly accuracy of the battery cell.

[0058] In some embodiments, a liquid injection hole 7 is further provided on the first side wall of the housing 1, and the liquid injection hole 7 is located between two welding through holes 101.

[0059] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, which includes a battery cell according to any one of the above technical solutions.

[0060] Since the battery pack includes a battery cell and has the same effects as the battery cell, it will not be elaborated here.

[0061] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell, wherein a first side wall of the shell is provided with two welding through holes and two pole mounting holes; Two poles, the two poles are respectively arranged in the two pole mounting holes; A pole group, wherein each pole of the pole group is provided with a pole lug corresponding to each pole; Two connecting pieces, each of which comprises a pole connecting portion and a pole lug connecting portion, wherein the pole connecting portion is connected to one pole, and the pole connecting portions of the two connecting pieces extend into the corresponding welding through holes respectively, so as to complete the welding of the connecting piece and the pole lug in the welding through holes; Two insulating sealing components, the two insulating sealing components are respectively arranged at the two welding through holes to close the welding through holes, the insulating sealing components include a sealing plate and an insulating plate, the sealing plate is provided with a snap-fitting groove, the insulating plate is provided with a snap-fitting protrusion, the snap-fitting groove and the snap-fitting protrusion are snap-fitted; the maximum width of the notch of the snap-fitting groove is smaller than the maximum width of the groove bottom of the snap-fitting groove; a disconnecting groove is provided in the middle of the snap-fitting protrusion, the disconnecting groove divides the snap-fitting protrusion into two or more snap-fitting protrusion sections, and each of the snap-fitting protrusion sections is suitable for being deformed inwardly toward the disconnecting groove during the snap-fitting process.

2. The battery cell according to claim 1, characterized in that: The clamping groove includes a first groove body and a second groove body, the first groove body is a blind groove, the second groove body is a through groove, the maximum width of the first groove body is greater than the maximum width of the second groove body; the side wall of the second groove body is retracted inward along a direction away from the first groove body to form a first guide slope, and the groove opening of the second groove body is provided with a chamfered corner.

3. The battery cell according to claim 2, characterized in that: The included angle between the first guiding inclined surface and the thickness direction of the sealing plate is α, and 10°≤α≤80°.

4. The battery cell according to claim 2 or 3, characterized in that: The thickness of the sealing plate is T, 1.2 mm ≤ T ≤ 1.8 mm; the depth of the first groove body is t1, 0.25 mm ≤ t1 ≤ 0.55 mm; the depth of the second groove body is t2, 0.25 mm ≤ t2 ≤ 0.55 mm.

5. The battery cell according to claim 2 or 3, characterized in that: The snap-fit ​​protrusion includes a first column section and a second column section, the structure of the first column section is adapted to the structure of the first slot body, and the structure of the second column section is adapted to the structure of the second slot body; the side wall of the second column section expands outward in a direction away from the insulating plate to form a second guide slope, and the top outer edge of the second column section is provided with a chamfer, and the chamfer is suitable for adapting to the rounded corner of the second slot body.

6. The battery cell according to claim 5, characterized in that: The included angle between the second guiding inclined surface and the axis of the second column section is β, β=α.

7. The battery cell according to claim 5, characterized in that: The minimum distance between the outer wall of the root of the first column segment and the disconnection groove is W1, 0.35mm≤W1≤1.2mm; the width of the outer wall of the second column segment protruding from the top of the first column segment is W2, W2≥0.5mm.

8. The battery cell according to any one of claims 1 to 3, characterized in that: The disconnecting groove is a straight groove, which divides the clamping protrusion into two clamping protrusion parts; the width of the disconnecting groove is W3, 1mm≤W3≤5mm; and at least three clamping grooves are arranged at intervals along the length direction of the sealing plate.

9. The battery cell according to any one of claims 1 to 3, characterized in that: A sink is provided around the welding through hole, and the size of the insulating plate is smaller than that of the sealing plate, so that the insulating plate and the sealing plate form a step around their peripheries, and the step cooperates with the sink.

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

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