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 housing having a first opening and a second opening opposite to each other; the pole group is arranged in the shell; the first cover plate assembly comprises a first cover body, a first electrode terminal arranged on the first cover body and a sealing plate; the first cover body is connected with the shell and blocks the first opening, and a through hole is formed in the first cover body; the first electrode terminal is electrically connected with the electrode group through the through hole; the sealing plate is hermetically arranged at the through hole; a first reinforcing rib and a second reinforcing rib are arranged on the side, away from the shell, of the sealing plate, the first reinforcing rib extends in the circumferential direction of the sealing plate and forms a closed ring shape, and the second reinforcing rib is located in the first reinforcing rib; and the second cover plate assembly is connected with the shell and blocks the second opening. According to the battery cell and the battery pack disclosed by the utility model, the structural strength of the sealing plate is ensured, the leakproofness of the battery cell is further ensured, and the stability of the performance of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to an electric core and a battery pack. Background Art

[0002] An electric core usually includes structures such as a housing, a pole group, a connecting piece, a pole column, etc. Among them, the airtightness inside the electric core is one of the key factors to ensure the normal operation of the electric core.

[0003] In some technical solutions, in order to improve the assembly convenience or for other considerations, an opening is provided on the housing. After the assembly is completed, a sealing plate needs to be provided at the opening to ensure the airtightness inside the electric core. However, in the related technical solutions, the thickness of the sealing plate is limited and it is easy to be damaged due to reasons such as changes in the internal pressure of the electric core or external force, thereby affecting the airtightness of the electric core and reducing the stability of the performance of the electric core. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defect that in the related technical solutions, the sealing plate is easy to be damaged due to reasons such as changes in the internal pressure of the electric core or external force, thereby affecting the airtightness of the electric core and reducing the stability of the performance of the electric core, so as to provide an electric core and a battery pack.

[0005] In a first aspect, the utility model provides an electric core, including: a housing having opposite first and second openings; a pole group disposed inside the housing; a first cover assembly including a first cover body, a first electrode terminal disposed on the first cover body, and a sealing plate; the first cover body is connected to the housing and seals the first opening, and a through hole is provided on the first cover body; the first electrode terminal is electrically connected to the pole group through the through hole; the sealing plate is hermetically disposed at the through hole; a first reinforcing rib and a second reinforcing rib are provided on a side of the sealing plate away from the housing, the first reinforcing rib extends along the circumference of the sealing plate and forms a closed ring, and the second reinforcing rib is located inside the first reinforcing rib; a second cover assembly is connected to the housing and seals the second opening.

[0006] Optionally, the height H1 of the first reinforcing rib and the thickness t of the sealing plate satisfy: 0.5t ≤ H1 ≤ 0.95t; and / or, the height H2 of the second reinforcing rib and the thickness t of the sealing plate satisfy: 0.5t ≤ H2 ≤ 0.95t.

[0007] Optionally, the width W1 of the first reinforcing rib and the thickness t of the sealing plate satisfy: 0.5t ≤ W1 ≤ 2.5t.

[0008] Optionally, a first groove is formed between the first reinforcing rib and the second reinforcing rib, and the first groove is in a closed ring shape; the width W2 of the first groove and the thickness t of the sealing plate satisfy: 0.25t ≤ W2 ≤ 2.0t.

[0009] Optionally, the thickness t of the sealing plate and the thickness T of the first cover satisfy: 0.5T ≤ t ≤ 0.8T.

[0010] Optionally, the distance W3 between the first reinforcing rib and the edge of the sealing plate satisfies: W3 ≥ 1.5 mm.

[0011] Optionally, a second groove and a third groove are provided on the side of the sealing plate facing the housing. The second groove is arranged corresponding to the first reinforcing rib, and the third groove is arranged corresponding to the second reinforcing rib.

[0012] Optionally, the first electrode terminal includes a pole column and a connecting piece. The pole column is installed on the first cover, and a central hole is provided through the pole column; the connecting piece is provided with a convex column, and the convex column passes through the central hole and is connected to the hole wall of the central hole.

[0013] Optionally, the second cover assembly includes a second cover. The second cover is connected to the housing and seals the second opening. A liquid injection hole and an explosion-proof valve are provided on the second cover.

[0014] In a second aspect, the present utility model further provides a battery pack, including: at least one battery cell as described above.

[0015] By using the technical solution of the present utility model, the electrical connection between the electrode group and the first electrode terminal is realized by opening a through hole in the first cover, improving the convenience of battery cell assembly; and, a sealing plate is hermetically arranged at the through hole, and a first reinforcing rib and a second reinforcing rib are arranged on the sealing plate. The first reinforcing rib is in a closed ring shape along the circumferential direction of the sealing plate, and the second reinforcing rib is located inside the first reinforcing rib. The first reinforcing rib and the second reinforcing rib cooperate with each other to ensure the structural strength of the sealing plate, thereby ensuring the airtightness of the battery cell and improving the stability of the battery cell performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description 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.

[0017] Figure 1 It is a cross-sectional view of a battery cell according to an embodiment of the present utility model;

[0018] Figure 2 It is a cross-sectional view of a first cover assembly according to an embodiment of the present utility model;

[0019] Figure 3 It is a partial structural schematic diagram of the outside of a first cover assembly according to an embodiment of the present utility model;

[0020] Figure 4 Schematic diagram of the inner structure of a first cover plate assembly according to an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the structure of a sealing plate according to an embodiment of the present invention;

[0022] Figure 6 Cross-sectional view of the sealing plate in the length direction and its partial enlarged view according to an embodiment of the present invention;

[0023] Figure 7 Cross-sectional view of the sealing plate in the width direction according to an embodiment of the present invention.

[0024] Explanation of reference numerals:

[0025] 1. Housing; 11. First opening; 12. Second opening;

[0026] 2. Electrode group; 21. First tab; 22. Second tab;

[0027] 3. First cover plate assembly; 31. First cover body; 311. Through hole; 32. First electrode terminal; 321. Pole post; 322. Connecting piece; 3221. First connecting portion; 3222. Second connecting portion; 33. Sealing plate; 331. First reinforcing rib; 332. Second reinforcing rib; 333. First groove; 334. Edge portion; 335. Second groove, 336. Third groove;

[0028] 4. Second cover plate assembly; 41. Second cover body; 42. Second electrode terminal; 43. Liquid injection hole; 44. Explosion-proof valve. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The following combines with Figures 1 to 7 , and describes the embodiments of the present invention.

[0031] According to an embodiment of the present invention, a battery pack is provided, including at least one battery cell. It can be understood that the battery pack may include one, two, or multiple battery cells. The present invention does not specifically limit the number of battery cells provided, as long as the design requirements are met.

[0032] Furthermore, asFigure 1 As shown in the figure, the battery cell includes a housing 1, a pole group 2, and a first cover assembly 3 and a second cover assembly 4 provided at opposite ends of the housing 1. Among them, the interior of the housing 1 is hollow and has opposite first opening 11 and second opening 12, and the pole group 2 is provided inside the housing 1. The first cover assembly 3 is connected to the housing 1 and seals the first opening 11, and the first electrode terminal 32 of the first cover assembly 3 is electrically connected to the pole group 2. The second cover assembly 4 is connected to the housing 1 of and seals the second opening 12.

[0033] Specifically, the first cover assembly 3 includes a first cover body 31, a first electrode terminal 32 provided on the first cover body 31, and a sealing plate 33. As Figure 3 shown, Figure 3 Fig. shows a partial structural schematic diagram of the outside of the first cover assembly 3, that is, the structural schematic diagram when the sealing plate 33 is not provided. Among them, the outside of the first cover assembly 3 refers to the side of the first cover assembly 3 away from the housing 1, and the inside of the first cover assembly 3 refers to the side of the first cover assembly 3 facing the housing 1. The first cover body 31 is used to be connected to the housing 1 and seal the first opening 11. Exemplarily, the first cover body 31 can be welded, bonded, interference-fitted, etc. with the housing 1. And, a through hole 311 is provided on the first cover body 31, and the first electrode terminal 32 is electrically connected to the pole group 2 through the through hole 311. The sealing plate 33 is hermetically arranged at the through hole 311. Specifically, the sealing plate 33 is connected to the first cover body 31 and seals the through hole 311 to ensure the airtightness inside the battery cell. Exemplarily, the sealing plate 33 can be welded, bonded, interference-fitted, etc. with the first cover body 31.

[0034] As Figure 5 shown, a first reinforcing rib 331 and a second reinforcing rib 332 are provided on the side of the sealing plate 33 away from the housing 1. The first reinforcing rib 331 extends along the circumferential direction of the sealing plate 33 and forms a closed ring, and the second reinforcing rib 332 is located inside the first reinforcing rib 331. Among them, the side of the sealing plate 33 away from the housing 1 is specifically the outside of the first cover assembly 3.

[0035] In this embodiment, the electrical connection between the pole group 2 and the first electrode terminal 32 is realized by opening the through hole 311 on the first cover body 31, which improves the convenience of battery cell assembly; and, the sealing plate 33 is hermetically arranged at the through hole 311, the first reinforcing rib 331 and the second reinforcing rib 332 are arranged on the sealing plate 33, the first reinforcing rib 331 is in a closed ring along the circumferential direction of the sealing plate 33, the second reinforcing rib 332 is located inside the first reinforcing rib 331, and the first reinforcing rib 331 and the second reinforcing rib 332 cooperate with each other to ensure the structural strength of the sealing plate 33, thereby ensuring the airtightness of the battery cell and improving the stability of the battery cell performance.

[0036] In some embodiments, as Figure 5As shown, the first reinforcing rib 331 has a runway-shaped ring structure, the second reinforcing rib 332 has a strip structure, and the second reinforcing rib 332 extends in the length direction within the first reinforcing rib 331.

[0037] In some embodiments not shown, the first reinforcing rib 331 may also have structures such as a circular ring shape or a rectangular ring shape, and the second reinforcing rib 332 may also have a closed ring structure.

[0038] It can be understood that the shape and structure of the first reinforcing rib 331 and the second reinforcing rib 332 depend on the shape and structure of the sealing plate 33, and the shape and structure of the sealing plate 33 depend on the shape and structure of the through hole 311.

[0039] In some embodiments, the first reinforcing rib 331 and the second reinforcing rib 332 may be integrally formed with the sealing plate 33, and the first reinforcing rib 331 and the second reinforcing rib 332 protrude from the side of the sealing plate 33 away from the housing 1.

[0040] In some embodiments, as Figure 5 shown, the first reinforcing rib 331 and the second reinforcing rib 332 are arranged at intervals, and a first groove 333 is formed between the first reinforcing rib 331 and the second reinforcing rib 332. The first groove 333 has a closed ring shape. Exemplarily, the first groove 333 has a runway-shaped ring structure.

[0041] In some embodiments, the width of the first reinforcing rib 331 in the extending direction is the same, that is, the width of the first reinforcing rib 331 at any position in its own circumferential direction is the same.

[0042] In some embodiments, the width of the second reinforcing rib 332 in the extending direction is the same, that is, the width of the second reinforcing rib 332 at any position in its own length direction is the same.

[0043] In some embodiments, the groove width of the first groove 333 in the extending direction is the same, that is, the groove width of the first groove 333 at any position in its own circumferential direction is the same.

[0044] The same setting dimensions of the first reinforcing rib 331, the second reinforcing rib 332, and the first groove 333 in their own extending directions are convenient for the processing and manufacturing of the sealing plate 33 and improve production efficiency.

[0045] In some embodiments not shown, the width of the first reinforcing rib 331 in the extending direction may be different, the width of the second reinforcing rib 332 in the extending direction may also be different, and correspondingly, the groove width of the first groove 333 in the extending direction may also be different.

[0046] In some embodiments, as Figure 6 and 7As shown, the height H1 of the first reinforcing rib 331 and the thickness t of the sealing plate 33 satisfy: 0.5t ≤ H ≤ 0.95t. If the height H1 of the first reinforcing rib 331 is less than 0.5t, the strengthening effect will be weakened; if it is greater than 0.95t, the thickness at the first groove 333 of the sealing plate 33 will be too thin. When the height H1 of the first reinforcing rib 331 is within this range, the structural strength of the sealing plate 33 can be ensured.

[0047] In some embodiments, the height H2 of the second reinforcing rib 332 and the thickness t of the sealing plate 33 satisfy: 0.5t ≤ H ≤ 0.95t. If the height H2 of the second reinforcing rib 332 is less than 0.5t, the strengthening effect will be weakened; if it is greater than 0.95t, the thickness at the first groove 333 of the sealing plate 33 will be too thin. When the height H2 of the second reinforcing rib 332 is within this range, the structural strength of the sealing plate 33 can be ensured.

[0048] It can be understood that the height of the first reinforcing rib 331 refers to the setting dimension of the first reinforcing rib 331 in the thickness direction of the sealing plate 33, and the height of the second reinforcing rib 332 refers to the setting dimension of the second reinforcing rib 332 in the thickness direction of the sealing plate 33, that is Figure 6 and 7 the setting dimension in the up and down direction in. Among them, the height H1 of the first reinforcing rib 331 and the height H2 of the second reinforcing rib 332 can be the same or different. Preferably, the height H1 of the first reinforcing rib 331 is the same as the height H2 of the second reinforcing rib 332 for ease of processing and manufacturing.

[0049] In some embodiments, the width W1 of the first reinforcing rib 331 and the thickness t of the sealing plate 33 satisfy: 0.5t ≤ W1 ≤ 2.5t. When the width W1 of the first reinforcing rib 331 is within this range, the structural strength of the sealing plate 33 can be ensured.

[0050] In some embodiments, the width W2 of the first groove 333 and the thickness t of the sealing plate 33 satisfy: 0.25t ≤ W2 ≤ 2.0t. When the width W2 of the first groove 333 is within this range, the structural strength of the sealing plate 33 can be ensured. Among them, the width of the second reinforcing rib 332 depends on the width W1 of the first reinforcing rib 331 and the width W2 of the first groove 333.

[0051] By limiting the height and width of the first reinforcing rib 331, the height of the second reinforcing rib 332, and the width W2 of the first groove 333, the strength of the sealing plate 33 is ensured, and further the stability of the cell performance is ensured.

[0052] In some embodiments, the thickness t of the sealing plate 33 and the thickness T of the first cover 31 satisfy: 0.5T ≤ t ≤ 0.8T. Among them, the thickness T of the first cover 31 (not shown in the figure) is Figure 2The set dimension of the first cover body 31 in the up and down direction, the value range of T is 1.5 - 2 mm. The thickness t of the sealing plate 33 within this range can not only ensure the structural strength of the sealing plate 33, but also save the internal space of the battery cell and improve the space utilization rate inside the battery cell.

[0053] In some embodiments, the distance W3 between the first reinforcing rib 331 and the edge of the sealing plate 33 satisfies: W3 is greater than or equal to 1.5 mm, so as to facilitate the manufacturing process. As Figure 5 shown, the outer peripheral side of the sealing plate 33 has an edge portion 334. On the side of the sealing plate 33 away from the housing 1, the width of the edge portion 334 is also the distance W3 between the first reinforcing rib 331 and the edge of the sealing plate 33.

[0054] In some embodiments, the sealing plate 33 is a metal plate. Exemplarily, the sealing plate 33 can be an aluminum plate. The above-mentioned first reinforcing rib 331 and second reinforcing rib 332 are integrally formed on the sealing plate 33.

[0055] In some embodiments, as Figure 6 and 7 shown, on the side of the sealing plate 33 facing the housing 1, there are a second groove 335 and a third groove 336. The second groove 335 is correspondingly arranged with the first reinforcing rib 331, and the third groove 336 is correspondingly arranged with the second reinforcing rib 332 to further ensure the structural strength of the sealing plate 33. Among them, the side of the sealing plate 33 facing the housing 1 is specifically the inner side of the first cover plate assembly 3.

[0056] In some embodiments, the first reinforcing rib 331 has a racetrack-shaped ring structure. The second groove 335 is located in the middle of the width direction of the first reinforcing rib 331, and the second groove 335 has a racetrack-shaped ring structure. The groove width of the second groove 335 can be the same as the groove width of the first groove 333.

[0057] In some embodiments, the second reinforcing rib 332 has a strip structure. The third groove 336 is located in the middle of the width direction of the second reinforcing rib 332, and the third groove 336 has a strip structure.

[0058] In some embodiments, the groove depths of the second groove 335 and the third groove 336 are respectively the same as the height of the first reinforcing rib 331 and the height of the second reinforcing rib 332.

[0059] In some embodiments, a plurality of first reinforcing ribs 331 may be provided. The plurality of first reinforcing ribs 331 are sequentially arranged at intervals from the inside to the outside, and a fourth groove is formed between adjacent two first reinforcing ribs 331. Among them, the width of the fourth groove may be the same as the width of the first groove 333, and the depth of the fourth groove may also be the same as the depth of the first groove 333. It can be understood that the present utility model does not specifically limit the number of the first reinforcing ribs 331. The first reinforcing ribs 331 may be one, two, three, four, etc. The number of the first reinforcing ribs 331 depends on the set size of the sealing plate 33.

[0060] In some embodiments, the first cover assembly 3 further includes an insulating member (not shown in the figure). The insulating member is located on the side of the sealing plate 33 facing the housing 1, and the insulating member is disposed between the sealing plate 33 and the electrode group 2 to achieve the mutual insulation setting between the sealing plate 33 and the electrode group 2.

[0061] In some embodiments, the insulating member is injection-molded on the side of the sealing plate 33 facing the housing 1, and at least part of the structure of the insulating member is fitted and connected to the second groove 335 and the third groove 336 of the sealing plate 33 to improve the bonding strength between the sealing plate 33 and the insulating member.

[0062] In some embodiments, such as Figure 1 and 2 shown, the first electrode terminal 32 includes a pole column 321 and a connecting piece 322. The pole column 321 is installed on the first cover body 31, and a central hole is formed through the pole column 321. The connecting piece 322 is provided with a convex column, and the convex column passes through the central hole and is connected to the hole wall of the central hole. Specifically, the outer peripheral wall of the convex column is welded to the hole wall of the central hole, preferably welded in a full circle, to achieve the electrical connection between the pole column 321 and the connecting piece 322.

[0063] In some embodiments, first pole lugs 21 and second pole lugs 22 are respectively provided and protrude from opposite ends of the electrode group 2. The first pole lug 21 is correspondingly arranged with the first opening 11 of the housing 1, and the second pole lug 22 is correspondingly arranged with the second opening 12 of the housing 1. The first pole lug 21 is electrically connected to the connecting piece of the first cover assembly 3.

[0064] Specifically, such as Figure 4As shown, the connecting piece 322 is located inside the first cover 31, that is, on the side close to the housing 1. The connecting piece 322 includes a connected first connecting portion 3221 and a second connecting portion 3222. The above-mentioned convex post is arranged on the first connecting portion 3221, and the first connecting portion 3221 is electrically connected to the pole post 321 through the convex post. At least part of the structure of the second connecting portion 3222 is located at the through hole 311 and is exposed outside the housing 1 through the through hole 311. The first pole tab 21 extends through the through hole 311 and bends toward the second connecting portion 3222 to form a first bending portion. The first bending portion of the first pole tab 21 is located above the second connecting portion 3222 and is welded to the second connecting portion 3222. Exemplarily, the first bending portion and the second connecting portion 3222 can be laser welded or ultrasonically welded, etc. The above-mentioned sealing plate 33 is located above the welding position of the first bending portion and the second connecting portion 3222. In this embodiment, the welding process of the connecting piece 322 and the pole group 2 and the bending process of the connecting piece 322 are reduced, the space utilization rate inside the battery is improved, and the production efficiency is increased.

[0065] In some embodiments, the second cover assembly 4 includes a second cover 41 and a second electrode terminal 42. The second cover 41 is connected to the housing 1 and seals the second opening 12. The second electrode terminal 42 is installed on the second cover 41, and the second electrode terminal 42 is electrically connected to the second pole tab 22. The second pole tab 22 bends toward one side to form a second bending portion, and the second bending portion is connected to the side of the second electrode terminal 42 close to the housing 1, such as by welding.

[0066] In some embodiments, the second cover 41 is provided with a liquid injection hole 43 and an explosion-proof valve 44, and the liquid injection hole 43 and the explosion-proof valve 44 are arranged at intervals. Among them, the liquid injection hole 43 communicates with the inside and outside of the second cover 41, that is, communicates with the side of the second cover 41 close to the housing 1 and the side far from the housing 1. The liquid injection hole 43 is used to inject electrolyte into the pole group 2. The explosion-proof valve 44 is a weak area provided on the second cover 41 to prevent explosion due to excessive internal pressure of the battery cell.

[0067] In the above embodiment, the assembly method of the battery cell is as follows: the second pole tab 22 of the pole group 2 is first welded to the second electrode terminal 42 of the second cover assembly 4, and then assembled into the housing 1; the first cover assembly 3 is then assembled to the first opening 11 of the housing 1, and the first pole tab 21 is connected to the connecting piece 322; finally, the sealing plate 33 is welded to the housing 1 to seal the through hole 311.

[0068] In some embodiments not shown, the first pole tab 21 and the second pole tab 22 of the pole group 2 can also be arranged at the same end of the pole post 321. Correspondingly, the first electrode terminal 32 and the second electrode terminal 42 can both be arranged on the first cover assembly 3.

[0069] In some embodiments, the first electrode terminal 32 may be the positive electrode terminal of the battery cell, and the second electrode terminal 42 may be the negative electrode terminal of the battery cell. Alternatively, in some embodiments, the first electrode terminal 32 may be the negative electrode terminal of the battery cell, and the second electrode terminal 42 may be the positive electrode terminal of the battery cell.

[0070] In some embodiments, the battery cell further includes an upper plastic part, a lower plastic part, and a sealing ring. The pole post 321 is further provided with a riveting rib, and the upper plastic part, the lower plastic part, and the sealing ring are fixed to the first cover body 31 through the riveting rib.

[0071] Although the embodiments of the present invention 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 invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: A housing having a first opening and a second opening opposite to each other; A pole group, arranged in the shell; A first cover plate assembly, comprising a first cover body, a first electrode terminal disposed on the first cover body, and a sealing plate; the first cover body is connected to the shell and blocks the first opening, and a through hole is provided on the first cover body; the first electrode terminal is electrically connected to the electrode group through the through hole; the sealing plate is sealed and disposed at the through hole; a first reinforcing rib and a second reinforcing rib are provided on a side of the sealing plate away from the shell, the first reinforcing rib extends along the circumference of the sealing plate and forms a closed ring, and the second reinforcing rib is located inside the first reinforcing rib; The second cover plate assembly is connected to the shell and blocks the second opening.

2. The battery cell according to claim 1, characterized in that: The height H1 of the first reinforcing rib and the thickness t of the sealing plate satisfy: 0.5t≤H≤0.95t; and / or, The height H2 of the second reinforcing rib and the thickness t of the sealing plate satisfy: 0.5t≤H≤0.95t.

3. The battery cell according to claim 2, characterized in that: The width W1 of the first reinforcing rib and the thickness t of the sealing plate satisfy: 0.5t≤W1≤2.5t.

4. The battery cell according to claim 3, characterized in that: A first groove is formed between the first reinforcing rib and the second reinforcing rib, and the first groove is in a closed ring shape; The width W2 of the first groove and the thickness t of the sealing plate satisfy: 0.25t≤W2≤2.0t.

5. The battery cell according to claim 1, characterized in that: The thickness t of the sealing plate and the thickness T of the first cover body satisfy: 0.5T≤t≤0.8T.

6. The battery cell according to claim 1, characterized in that: A distance W3 between the first reinforcing rib and the edge of the sealing plate satisfies: W3 ≥ 1.5 mm.

7. The battery cell according to any one of claims 1 to 6, characterized in that: A second groove and a third groove are provided on one side of the sealing plate facing the shell, the second groove is provided corresponding to the first reinforcing rib, and the third groove is provided corresponding to the second reinforcing rib.

8. The battery cell according to any one of claims 1 to 6, characterized in that: The first electrode terminal includes a pole and a connecting piece. The pole is mounted on the first cover body and has a center hole passing through the pole. The connecting piece is provided with a convex column, which passes through the center hole and is connected to the hole wall of the center hole.

9. The battery cell according to any one of claims 1 to 6, characterized in that: The second cover plate assembly includes a second cover body, which is connected to the shell and blocks the second opening. The second cover body is provided with a liquid injection hole and an explosion-proof valve.

10. A battery pack, characterized in that: include: At least one battery cell according to any one of claims 1 to 9.

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