Battery cell cover plate assembly, battery cell, and battery pack

Abstract

The utility model relates to battery technical field discloses the electric core cover plate subassembly, electric core and battery package, wherein the electric core cover plate subassembly, include: cover plate body, pole body and pole bottom plate, cover plate body is seted up and is installed the hole, pole body is inserted in the installed hole and extends to the first surface of cover plate body at least, the cross section of pole body is track and field runway shape, the size of pole body along cover plate body length direction is L1, the size of pole body along cover plate body width direction is W1, satisfy L1>W1, pole bottom plate is connected with one end of pole body and is located in the second surface opposite with the first surface of cover plate body, the size of pole bottom plate along cover plate body width direction is W2, satisfy 0.25<=W1 / W2<=0.5. The utility model discloses the pole body of track and field runway shape can ensure the overcurrent capacity, and through the processing size of pole bottom plate and pole body, can ensure the processing quality of pole body.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell cover assembly, a cell, and a battery pack. Background Technology

[0002] With the continuous development of technology, users have increasingly higher requirements for new energy batteries. To improve the fast charging capability of battery cells, it is necessary to improve the current carrying capacity of the terminals. Terminals typically consist of a connected terminal body and a terminal base plate. In thinner battery cells, to ensure the current carrying capacity of the terminals, the terminal body can be made into a columnar structure with a cross-section resembling an athletic track.

[0003] However, due to the uneven shape of the pole body, which has a track-track-shaped cross section, defects such as warping, breakage, and difficulty in forming are prone to occur during the processing of the pole body and the pole base plate, resulting in poor production quality of the pole. Utility Model Content

[0004] In view of this, the present invention provides a cell cover plate assembly, a cell, and a battery pack to solve the problem that the poor production quality of the pole body with a track-track shaped cross section is caused by its uneven shape.

[0005] In a first aspect, this utility model provides a battery cell cover assembly, comprising:

[0006] The cover plate body has a mounting hole that extends through the thickness direction;

[0007] The pole body is inserted into the mounting hole and extends at least to the first surface of the cover plate body. The cross section of the pole body perpendicular to the thickness direction is in the shape of an athletic track. The dimension of the pole body along the length direction of the cover plate body is L1, and the dimension of the pole body along the width direction of the cover plate body is W1, satisfying L1 > W1.

[0008] The pole base plate is connected to one end of the pole body and is disposed on the second side of the cover plate body opposite to the first side. The dimension of the pole base plate along the width direction of the cover plate body is W2, which satisfies 0.25≤W1 / W2≤0.5.

[0009] Beneficial Effects: The battery cell cover assembly of this utility model adopts a track-track shaped electrode body, and the dimension of the electrode body along the length direction of the cover body is larger than its dimension along the width direction of the cover body. Compared with a cylindrical electrode body, it has a larger current-passing area, thus having a higher current-passing capacity, which can meet the requirements of high-capacity and fast-charging cells. By controlling the ratio between the electrode body and the electrode base plate along the width direction of the cover body within a suitable range, a sufficient margin can be reserved on the electrode base plate to facilitate the forming of the electrode body, while reducing the risk of warping and breakage, and improving the processing quality of the electrode body and the electrode base plate.

[0010] In one optional embodiment, the dimension L1 of the pole body along the length direction of the cover plate body and the dimension W1 of the pole body along the width direction of the cover plate body satisfy 1 < L1 / W1 < 6.

[0011] Beneficial effects: By controlling the ratio between the length and width of the electrode body within a suitable range, it is possible to ensure that the electrode body has sufficient flow capacity and avoid the electrode body being too long, which would lead to material shortage defects during processing. In addition, an excessively long electrode body will reduce structural strength, making the electrode body prone to deformation and breakage.

[0012] In one optional embodiment, the dimension L1 of the pole body along the length direction of the cover plate body satisfies 4mm < L1 < 50mm.

[0013] And / or, the dimension W1 of the pole body along the width direction of the cover plate body satisfies 3mm≤W1≤15mm.

[0014] Beneficial effects: By controlling the length and width of the electrode body within a suitable range, it is beneficial to form the electrode body and will not occupy too much space inside the battery cell.

[0015] In one optional embodiment, the dimension W2 of the pole base plate along the width direction of the cover plate body satisfies 6mm≤W2≤50mm.

[0016] Beneficial effects: By controlling the width of the pole base plate within a suitable range, the processing quality of the pole body and the pole base plate can be further improved, avoiding the risk of breakage.

[0017] In one optional embodiment, along the length direction of the cover plate body, the minimum distance between the outer peripheral wall of the pole body and the outer peripheral wall of the pole base plate is L2, which satisfies (W2-W1) / 2≤L2≤25mm.

[0018] Beneficial effects: By controlling the minimum distance between the outer peripheral wall of the pole body and the outer peripheral wall of the pole base plate within a suitable range, sufficient edge distance can be reserved to avoid risks such as warping and breakage at the edge of the pole body.

[0019] In one alternative embodiment, the long side of the track-shaped section extends along the length direction of the cover plate body, and the wide side of the track-shaped section extends along the width direction of the cover plate body.

[0020] Beneficial effects: The long side of the track-shaped cover plate extends along the length of the cover plate body, and the wide side extends along the width of the cover plate body. The structure is relatively simple, easy to manufacture, and conducive to cold heading.

[0021] In one optional embodiment, the track shape includes two arc segments and two straight segments. The two straight segments are arranged at intervals relative to each other along the width direction of the cover plate body, and the two arc segments are arranged at intervals relative to each other along the length direction of the cover plate body. The two arc segments are respectively connected to the two ends of the two straight segments on the same side.

[0022] Beneficial effects: The track-shaped cross section, composed of two circular arc segments and two straight segments, has a smooth profile, which can avoid the edge effect caused by the sharp corners of the pole body, facilitate the uniform distribution of current, and also has stronger bending and torsional resistance, effectively reducing stress concentration and avoiding the risk of breakage at the connection between the pole body and the pole base plate.

[0023] In one optional embodiment, the pole body has an elliptical cross-section perpendicular to the thickness direction, the major axis of the ellipse extending along the length direction of the cover plate body, and the minor axis of the ellipse extending along the width direction of the cover plate body.

[0024] Beneficial effects: The elliptical electrode body can distribute current more evenly, thereby improving heat dissipation of the battery cell. The elliptical structure has better structural strength, which is conducive to uniform stress distribution and can improve the reliability and pressure resistance of the electrode body.

[0025] Secondly, this utility model also provides a battery cell, comprising:

[0026] The housing has an opening at at least one end;

[0027] In the aforementioned cell cover assembly, the cover body is disposed over the opening and connected to the housing.

[0028] Beneficial effects: Because the battery cell includes a cell cover assembly, employing a track-track shaped terminal block body, and the dimension of the terminal block body along the length of the cover body is larger than its dimension along the width of the cover body, it has a larger current-carrying area compared to a cylindrical terminal block body. Therefore, it has a higher current-carrying capacity, meeting the requirements for high-capacity and fast-charging cells. By controlling the proportional relationship between the terminal block body and the terminal block base plate within a suitable range along the width of the cover body, a sufficient margin can be reserved on the terminal block base plate to facilitate the forming of the terminal block body, while reducing the risk of warping and breakage, and improving the processing quality of the terminal block body and the terminal block base plate.

[0029] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0030] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be elaborated here. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present utility model;

[0033] Figure 2 This is an exploded view of a battery cell cover assembly according to an embodiment of the present utility model;

[0034] Figure 3 This is a schematic diagram of the structure of the electrode body and electrode base plate of a battery cell cover assembly according to an embodiment of the present utility model;

[0035] Figure 4 for Figure 3 Top view;

[0036] Figure 5 This is a cross-sectional view of the electrode body of a battery cell cover assembly according to an embodiment of the present utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] This application includes: 1. Cover plate body; 101. Mounting hole; 2. Pole post body; 201. Arc segment; 202. Straight segment; 3. Pole post base plate; 4. Upper insulating component; 5. Riveting block; 6. Lower insulating component; 7. Sealing ring. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0041] According to embodiments of the present invention, on the one hand, such as Figure 1 and Figure 2 As shown, a battery cell cover assembly is provided, including: a cover body 1, a terminal body 2, and a terminal base plate 3. The cover body 1 has a through mounting hole 101 extending along its thickness direction. The terminal body 2 is inserted into the mounting hole 101 and extends at least to a first surface of the cover body 1. The cross-section of the terminal body 2 perpendicular to its thickness direction is shaped like an athletic track. The dimension of the terminal body 2 along the length direction of the cover body 1 is L1, and the dimension of the terminal body 2 along the width direction of the cover body 1 is W1, satisfying L1 > W1. The terminal base plate 3 is connected to one end of the terminal body 2 and is located on the second surface of the cover body 1 opposite to the first surface. The dimension of the terminal base plate 3 along the width direction of the cover body 1 is W2, satisfying 0.25 ≤ W1 / W2 ≤ 0.5.

[0042] Therefore, the cell cover assembly provided in this embodiment of the present invention adopts a track-shaped electrode body 2, and the dimension of the electrode body 2 along the length direction of the cover body 1 is larger than its dimension along the width direction of the cover body 1. Compared with the cylindrical electrode body 2, it has a larger current-passing area, thus having a higher current-passing capacity, which can meet the requirements of high-capacity and fast-charging cells. By controlling the proportional relationship between the electrode body 2 and the electrode base plate 3 along the width direction of the cover body 1, a sufficient margin can be reserved on the electrode base plate 3 to facilitate the forming of the electrode body 2, while reducing the risk of warping and breakage, and improving the processing quality of the electrode body 2 and the electrode base plate 3.

[0043] Specifically, in the thickness direction of the cover plate body 1, such as Figure 1 As indicated by arrow H in the diagram. The length direction of the cover plate body 1 is as follows. Figure 1 As indicated by arrow L in the diagram, the width direction of the cover body 1 is as follows: Figure 1As shown by arrow W in the diagram. The length direction of both the pole body 2 and the pole base plate 3 is consistent with the length direction of the cover body 1, and the width direction of both the pole body 2 and the pole base plate 3 is consistent with the width direction of the cover body 1. Therefore, L1 is the length dimension of the pole body 2, W1 is the width dimension of the pole body 2, and W2 is the width dimension of the pole base plate 3.

[0044] In one embodiment, the dimension L1 of the pole body 2 along the length direction of the cover plate body 1 and the dimension W1 of the pole body 2 along the width direction of the cover plate body 1 satisfy 1 < L1 / W1 < 6. By controlling the ratio between the length and width of the pole body 2 within a suitable range, it is possible to ensure that the pole body 2 has sufficient flow capacity and avoid the pole body 2 being too long, which could lead to material shortage defects during processing. In addition, an excessively long pole body 2 would also reduce structural strength, making the pole body 2 prone to deformation and breakage.

[0045] It should be noted that, due to the influence of the cold heading process, the length and width of the pole body 2 cannot be too small, otherwise it will be difficult to process and shape.

[0046] Furthermore, in one embodiment, such as Figure 4 As shown, the dimension L1 of the pole body 2 along the length of the cover plate body 1 satisfies 4mm < L1 < 50mm.

[0047] Furthermore, in one embodiment, such as Figure 4 As shown, the dimension W1 of the pole body 2 along the width direction of the cover plate body 1 satisfies 3mm≤W1≤15mm.

[0048] By controlling the length and width of the electrode body 2 within a suitable range, it is beneficial to form the electrode body 2 without occupying too much space inside the battery cell.

[0049] Furthermore, in one embodiment, such as Figure 4 As shown, the dimension W2 of the pole base plate 3 along the width direction of the cover plate body 1 satisfies 6mm≤W2≤50mm. By controlling the width dimension of the pole base plate 3 within a suitable range, the processing quality of the pole body 2 and the pole base plate 3 can be further improved, avoiding the risk of breakage.

[0050] In one embodiment, such as Figure 4 As shown, along the length of the cover plate body 1, the minimum distance between the outer peripheral wall of the pole body 2 and the outer peripheral wall of the pole base plate 3 is L2, which satisfies (W2-W1) / 2≤L2≤25mm. By controlling the minimum distance between the outer peripheral wall of the pole body 2 and the outer peripheral wall of the pole base plate 3 within a suitable range, sufficient edge clearance can be reserved to avoid risks such as warping and breakage at the edge of the pole body 2.

[0051] It should be noted that the pole body 2 is usually located at the center of one side of the pole base plate 3. The distance from both sides of the pole body 2 along its length to both sides of the pole base plate 3 along its length is generally the same. Similarly, the distance from both sides of the pole body 2 along its width to both sides of the pole base plate 3 along its width is also generally the same. (W2-W1) / 2 is the edge distance between the pole body 2 and the pole base plate 3 in the width direction. Therefore, (W2-W1) / 2≤L2 means that the edge distance between the pole body 2 and the pole base plate 3 in the length direction is greater than or equal to the edge distance between the pole body 2 and the pole base plate 3 in the width direction.

[0052] For example, the dimension W1 of the pole body 2 along the width direction of the cover plate body 1 is 3mm, and the dimension W2 of the pole base plate 3 along the width direction of the cover plate body 1 is 7mm. At this time, the minimum distance L2 between the outer wall of the pole body 2 and the outer wall of the pole base plate 3 can be 3mm, 5mm, 10mm, etc.

[0053] In one embodiment, the long side of the track-shaped structure extends along the length direction of the cover plate body 1, and the wide side of the track-shaped structure extends along the width direction of the cover plate body 1. The structure is relatively simple, easy to manufacture, and conducive to cold heading.

[0054] Furthermore, in one embodiment, such as Figure 5 As shown, the track-shaped cross-section comprises two arc segments 201 and two straight segments 202. The two straight segments 202 are spaced apart relative to each other along the width direction of the cover plate body 1, and the two arc segments 201 are spaced apart relative to each other along the length direction of the cover plate body 1. The two arc segments 201 are connected to the two ends of the two straight segments 202 on the same side. The track-shaped cross-section composed of the two arc segments 201 and the two straight segments 202 has a smooth profile, which can avoid the edge effect caused by the sharp corners of the pole body 2, facilitate the uniform distribution of current, and also have stronger bending and torsional resistance, effectively reducing stress concentration and avoiding the risk of breakage at the connection between the pole body 2 and the pole base plate 3.

[0055] Furthermore, both the pole base plate 3 and the cover plate body 1 have elongated cross-sections.

[0056] In one embodiment, the electrode body 2 has an elliptical cross-section perpendicular to its thickness direction. The major axis of the ellipse extends along the length of the cover body 1, and the minor axis extends along the width of the cover body 1. The elliptical electrode body 2 can distribute current more evenly, thereby improving heat dissipation of the battery cell. The elliptical structure has better structural strength, which is beneficial for uniform stress distribution and can improve the reliability and compressive strength of the electrode body 2.

[0057] In one embodiment, such as Figure 2As shown, the cell cover assembly also includes an upper insulating component 4 and a riveting block 5. The riveting block 5 is connected to the electrode body 2 and is positioned corresponding to the first surface. The upper insulating component 4 is sandwiched between the riveting block 5 and the cover body 1. The upper insulating component 4 is used to insulate the electrode body 2, preventing the electrode body 2 from directly contacting the cover body 1 and causing a short circuit. The riveting block 5 is used to fix the electrode body 2, resisting external forces such as vibration and impact, and improving the installation stability of the electrode body 2.

[0058] Specifically, after the cover plate body 1 is installed on the housing of the battery cell, the first side of the cover plate body 1 is located on the outside and the second side is located on the inside.

[0059] In one embodiment, such as Figure 1 and Figure 2 As shown, the cell cover assembly also includes a sealing ring 7 and a lower insulating member 6. The lower insulating member 6 is attached to the second surface, and the electrode base plate 3 is located on the side of the lower insulating member 6 away from the second surface. The sealing ring 7 is sleeved on the outer peripheral wall of the electrode body 2 and sandwiched between the electrode base plate 3 and the lower insulating member 6. The sealing ring 7 is used to improve the sealing performance of the cell cover assembly and reduce the risk of electrolyte leakage from the cell cover assembly. The lower insulating member 6 can improve the support effect and also serves as insulation to prevent direct contact between the cell and the cover body 1.

[0060] Specifically, the pole base plate 3 is located inside the lower insulating member 6, one axial end of the pole body 2 is fixedly connected to the pole base plate 3, and the other end passes through the lower insulating member 6 and the cover plate body 1. The sealing ring 7 is sleeved on the outer peripheral wall of the pole body 2, and the pole body 2 and the sealing ring 7 are fixed by the riveting block 5.

[0061] It should be noted that the material of the cover plate body 1 is not limited in this embodiment of the utility model. Any existing material can be selected as needed, such as the cover plate body 1 being a plain aluminum plate.

[0062] The process parameters of the battery of this utility model are described in further detail below with reference to specific embodiments. These examples should not be construed as limiting the scope of protection claimed by this utility model.

[0063] Example 1:

[0064] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 3mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 10mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 7mm. Therefore, L1 / W1 = 3.33, and W1 / W2 = 0.43. The test verification results after the battery cell production line are shown in Table 1.

[0065] Example 2:

[0066] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 4.5mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 25mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 9mm. Therefore, L1 / W1 = 5.56, and W1 / W2 = 0.5. The test verification results after the battery cell production line are shown in Table 1.

[0067] Example 3:

[0068] The dimension of the electrode body 2 along the width direction of the cover plate body 1 is W1, which is 6mm. The dimension of the electrode body 2 along the length direction of the cover plate body 1 is L1, which is 12mm. The dimension of the electrode base plate 3 along the width direction of the cover plate body 1 is W2, which is 15mm. Therefore, L1 / W1 = 2, W1 / W2 = 0.4. The test and verification results after the battery cell production line are shown in Table 1.

[0069] Example 4:

[0070] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 7.5mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 20mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 18mm. Therefore, L1 / W1 = 2.67, W1 / W2 = 0.42. The test verification results after the battery cell production line are shown in Table 1.

[0071] Example 5:

[0072] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 9mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 25mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 25mm. Therefore, L1 / W1 = 2.78, W1 / W2 = 0.36. The test verification results after the battery cell production line are shown in Table 1.

[0073] Example 6:

[0074] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 8.5mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 36mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 30mm. Therefore, L1 / W1 = 4.24, W1 / W2 = 0.28. The test verification results after the battery cell production line are shown in Table 1.

[0075] Example 7:

[0076] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 7mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 25mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 28mm. Therefore, L1 / W1 = 3.57, W1 / W2 = 0.25. The test verification results after the battery cell production line are shown in Table 1.

[0077] Example 8:

[0078] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 8mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 40mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 23mm. Therefore, L1 / W1 = 5, and W1 / W2 = 0.35. The test verification results after the battery cell production line are shown in Table 1.

[0079] Example 9:

[0080] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 10mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 18mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 23mm. Therefore, L1 / W1 = 1.8, W1 / W2 = 0.43. The test verification results after the battery cell production line are shown in Table 1.

[0081] Example 10:

[0082] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 8mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 10mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 24mm. Therefore, L1 / W1 = 1.25, and W1 / W2 = 0.33. The test verification results after the battery cell production line are shown in Table 1.

[0083] Comparative Example 1:

[0084] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 2mm, which is less than 3mm. The dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 5mm. The dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 6mm. Therefore, L1 / W1 = 2.5 and W1 / W2 = 0.33. The test verification results after the battery cell production line are shown in Table 1.

[0085] Comparative Example 2:

[0086] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 2.5mm, which is less than 3mm. The dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 4mm. The dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 5.2mm. Therefore, L1 / W1 = 1.6 and W1 / W2 = 0.48. The test verification results after the battery cell production line are shown in Table 1.

[0087] Comparative Example 3:

[0088] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 4mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 35mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 8.5mm. Therefore, L1 / W1 = 8.75, which is greater than 6, and W1 / W2 = 0.47. The test verification results after the battery cell production line are shown in Table 1.

[0089] Comparative Example 4:

[0090] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 6mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 42mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 18mm. Therefore, L1 / W1 = 7, which is greater than 6, and W1 / W2 = 0.33. The test verification results after the battery cell production line are shown in Table 1.

[0091] Comparative Example 5:

[0092] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 7mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 14mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 9mm. Therefore, L1 / W1 = 2, W1 / W2 = 0.78, which is greater than 0.5. The test verification results after the battery cell production line are shown in Table 1.

[0093] Comparative Example 6:

[0094] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 9mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 25mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 16mm. Therefore, L1 / W1 = 2.78, W1 / W2 = 0.56, which is greater than 0.5. The test verification results after the battery cell production line are shown in Table 1.

[0095] Comparative Example 7:

[0096] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 8mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 20mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 40mm. Therefore, L1 / W1 = 2.5, W1 / W2 = 0.2, which is less than 0.25. The test verification results after the battery cell production line are shown in Table 1.

[0097] Comparative Example 8:

[0098] The dimension W1 of the electrode body 2 along the width direction of the cover plate body 1 is 10mm, the dimension L1 of the electrode body 2 along the length direction of the cover plate body 1 is 38mm, and the dimension W2 of the electrode base plate 3 along the width direction of the cover plate body 1 is 46mm. Therefore, L1 / W1 = 3.8, W1 / W2 = 0.22, which is less than 0.25. The test verification results after the battery cell production line are shown in Table 1.

[0099] Table 1: Test Results

[0100]

[0101] As can be seen from Table 1, in Examples 1 to 10, the following conditions are met: 3mm≤W1≤15mm, 4mm<L1<50mm, 6mm≤W2≤50mm, 1<L1 / W1<6, 0.25≤W1 / W2≤0.5. The conditions before and after cold heading are normal, and the processing quality is good.

[0102] In Comparative Examples 1 and 2, W1 is less than 3mm, which is lower than the minimum value of the present invention. During cold heading, the size of the pole body 2 is too small, making it difficult to form.

[0103] In Comparative Examples 3 and 4, L1 / W1 is greater than 6, exceeding the maximum value of the present invention. The length-to-width ratio of the pole body 2 is too large, and the pole body 2 is too long and narrow, which leads to the risk of material shortage during cold heading, or even failure to form.

[0104] In Comparative Examples 5 and 6, W1 / W2 is greater than 0.5, exceeding the maximum value of the present utility model embodiment. In the width direction of the cover plate body 1, the reserved edge between the pole body 2 and the pole base plate 3 is insufficient, which leads to the risk of material shortage during cold heading, or even failure to form.

[0105] In Comparative Examples 7 and 8, W1 / W2 is less than 0.25, which is lower than the minimum value of the present utility model embodiment. In the width direction of the cover plate body 1, the reserved edge between the pole body 2 and the pole base plate 3 is too large, which causes the edge of the pole body 2 to warp defects or even break during cold heading.

[0106] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing and a battery cell cover assembly. The housing has an opening at at least one end, and an electrode assembly is disposed within the housing. The cover body 1 of the battery cell cover assembly covers the opening and is connected to the housing.

[0107] The battery cell provided in this embodiment adopts a track-shaped electrode body 2, and the dimension of the electrode body 2 along the length direction of the cover plate body 1 is larger than its dimension along the width direction of the cover plate body 1. Compared with the cylindrical electrode body 2, it has a larger current-carrying area, thus having a higher current-carrying capacity, which can meet the requirements of high-capacity and fast-charging cells. By controlling the proportional relationship between the electrode body 2 and the electrode base plate 3 along the width direction of the cover plate body 1, a sufficient margin can be reserved on the electrode base plate 3 to facilitate the forming of the electrode body 2, while reducing the risk of warping and breakage, and improving the processing quality of the electrode body 2 and the electrode base plate 3.

[0108] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: at least one battery cell.

[0109] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0110] To achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery management system and a heat dissipation system. It should be noted that any suitable existing structure can be selected from the other necessary modules or components included in the battery pack. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be repeated here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that the scope of the embodiments of this utility model is not limited thereto.

[0111] Although 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 cell cover assembly, characterized in that, include: The cover plate body has a mounting hole that extends through the thickness direction; The pole body is inserted into the mounting hole and extends at least to the first surface of the cover plate body. The cross section of the pole body perpendicular to the thickness direction is in the shape of an athletic track. The dimension of the pole body along the length direction of the cover plate body is L1, and the dimension of the pole body along the width direction of the cover plate body is W1, satisfying L1 > W1. The pole base plate is connected to one end of the pole body and is disposed on the second side of the cover plate body opposite to the first side. The dimension of the pole base plate along the width direction of the cover plate body is W2, which satisfies 0.25≤W1 / W2≤0.

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2. The cell cover assembly according to claim 1, characterized in that, The dimension L1 of the pole body along the length direction of the cover plate body and the dimension W1 of the pole body along the width direction of the cover plate body satisfy 1 < L1 / W1 < 6.

3. The cell cover assembly according to claim 2, characterized in that, The dimension L1 of the pole body along the length of the cover plate body satisfies 4mm < L1 < 50mm; And / or, the dimension W1 of the pole body along the width direction of the cover plate body satisfies 3mm≤W1≤15mm.

4. The cell cover assembly according to claim 3, characterized in that, The dimension W2 of the pole base plate along the width direction of the cover plate body satisfies 6mm≤W2≤50mm.

5. The cell cover assembly according to any one of claims 1 to 4, characterized in that, Along the length of the cover plate body, the minimum distance between the outer peripheral wall of the pole body and the outer peripheral wall of the pole base plate is L2, which satisfies (W2-W1) / 2≤L2≤25mm.

6. The cell cover assembly according to any one of claims 1 to 4, characterized in that, The long side of the track-shaped structure extends along the length of the cover plate body, and the wide side of the track-shaped structure extends along the width of the cover plate body.

7. The cell cover assembly according to claim 6, characterized in that, The track shape includes two arc segments and two straight segments. The two straight segments are arranged at intervals relative to each other along the width direction of the cover plate body, and the two arc segments are arranged at intervals relative to each other along the length direction of the cover plate body. The two arc segments are respectively connected to the two ends of the two straight segments on the same side.

8. The cell cover assembly according to any one of claims 1 to 4, characterized in that, The pole body has an elliptical cross-section perpendicular to the thickness direction, with the major axis of the ellipse extending along the length of the cover body and the minor axis extending along the width of the cover body.

9. A battery cell, characterized in that, include: The housing has an opening at at least one end; The cell cover assembly according to any one of claims 1 to 8, wherein the cover body is disposed over the opening and connected to the housing.

10. A battery pack, characterized in that, include: At least one battery cell as described in claim 9.

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