Battery cell pole, battery cell, and battery pack

Abstract

The utility model relates to battery technology field discloses the electric core pole, electric core and battery package, wherein the electric core pole, connect in proper order first column body, connecting body, second column body and bottom plate along the first direction, and the first column body and second column body are all the track and field runway shape along the first direction orthographic projection, and the orthographic projection of first column body is located in the orthographic projection of second column body, on the cross section of electric core pole along the first direction, the outer wall of connecting body is inclined plane structure, first column body is suitable for extending to the one side of the cover plate body of electric core, and the bottom plate is located in the opposite side of cover plate body. The electric core pole of the utility model, and connecting body connects first column body and second column body through smooth inclined plane structure, and it is convenient for the cold heading punch forming of electric core pole, and it is also convenient for sealing ring to slide from first column body and connecting body to second column body, that is, it is convenient for installing sealing ring, and guarantees the sealing performance of sealing ring.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to cell terminals, cells, and battery packs. Background Technology

[0002] With the continuous development of technology, users have increasingly higher requirements for new energy batteries. In order to improve the fast charging capability of the battery cells, it is necessary to improve the current carrying capacity of the terminals. On thin battery cells, in order to ensure the current carrying capacity of the terminals, the terminals can be made into a columnar structure with a cross-section resembling an athletic track.

[0003] The pole piece typically consists of a first column and a second column connected together, with a stepped surface between them for limiting and supporting the riveting block. Because the pole piece with its track-track-shaped cross-section has an uneven shape, defects such as corner collapse and poor flatness of the stepped surface are prone to occur during cold heading. Furthermore, the stepped surface can hinder the installation of the sealing ring, making it difficult to fit the sealing ring onto the pole piece, thus making sealing ring installation inconvenient. Utility Model Content

[0004] In view of this, the present invention provides a battery cell terminal post, a battery cell, and a battery pack to solve the problem that the terminal post with a track-shaped cross section has poor stability during cold forging and is inconvenient to install a sealing ring because the first and second posts are connected by a stepped surface.

[0005] In a first aspect, the present invention provides a battery cell electrode post, comprising: a first column, a connecting body, a second column, and a base plate connected sequentially along a first direction, wherein the orthographic projections of the first column and the second column along the first direction are both in the shape of an athletic track, and the orthographic projection of the first column is located within the orthographic projection of the second column; on the cross section of the battery cell electrode post along the first direction, the outer wall of the connecting body has an inclined structure; the first column is adapted to extend to one side of the cover plate body of the battery cell; and the base plate is disposed on the opposite side of the cover plate body.

[0006] Beneficial effects: The battery cell terminal of this invention has an overall columnar structure with a cross-section resembling an athletic track, resulting in a relatively large current-carrying area and excellent current-carrying capacity, which is beneficial for the use of high-capacity and fast-charging cells. The first and second terminals are connected by a connector with a smooth, beveled surface structure, replacing the traditional stepped surface structure. This eliminates right-angle edges at the connection between the first and second terminals, facilitating cold-forging and stamping of the battery cell terminal. Furthermore, it allows the sealing ring to slide smoothly from the first terminal and connector to the second terminal, simplifying installation and ensuring the sealing performance of the sealing ring.

[0007] In one optional embodiment, the dimension of the inclined structure is L1 in the length direction of the cover plate body, satisfying 0.2mm≤L1≤0.8mm.

[0008] Beneficial effects: By controlling the dimensions of the inclined structure within a suitable range along the length of the cover plate body, the cold heading and stamping of the battery cell terminals is facilitated without occupying space along the length of the cover plate body. If the value of L1 is too small, the dimensions of the inclined structure will be too small, making cold heading more difficult and resulting in difficulty in forming the battery cell terminals. If the value of L1 is too large, the battery cell terminals will occupy space along the length of the cover plate body.

[0009] In one optional embodiment, the dimension of the inclined structure in the width direction of the cover plate body is L2, which satisfies 0.2mm≤L2≤0.8mm.

[0010] Beneficial effects: Similarly, by controlling the dimensions of the inclined structure in the width direction of the cover plate body within a suitable range, cold heading is facilitated without occupying space in the width direction of the cover plate body. If the value of L2 is too small, it will be difficult to form the cell electrode post during cold heading; if the value of L2 is too large, it will occupy space in the width direction of the cover plate body.

[0011] In one alternative implementation, in the first direction, the dimension of the connector is L3, satisfying 0.3mm≤L3≤1mm.

[0012] Beneficial effects: By controlling the dimensions of the connector in the first direction within a suitable range, cold heading is facilitated without occupying space in the first direction, and interference between the connector and the riveting blocks of the cover plate assembly can be avoided. If the value of L3 is too small, it is difficult to form the cell electrode post during cold heading; if the value of L3 is too large, it occupies space in the first direction, and the inclined structure of the connector is prone to interference with the riveting blocks, resulting in greater riveting difficulty.

[0013] In one optional embodiment, on the cross-section of the cell electrode post along the first direction, the angle between the inclined structure and the plane perpendicular to the first direction is θ, satisfying 20°≤θ≤80°.

[0014] Beneficial effects: By controlling the included angle θ within a suitable range, the stability of cold heading can be improved, avoiding defects such as edge collapse and damage to the battery cell terminals. If the included angle θ is too small, edge collapse defects are likely to occur during cold heading; if the included angle θ is too large, the battery cell terminals are likely to be damaged during cold heading.

[0015] In one optional embodiment, the base plate is elongated, with the long sides of the first and second columns extending along the length direction of the base plate and the wide sides of the first and second columns extending along the width direction of the base plate.

[0016] Beneficial effects: Setting the long sides of the first and second pillars to be consistent with the long side of the base plate, and setting the wide sides of the first and second pillars to be consistent with the wide side of the base plate, facilitates uniform current distribution, reduces resistance and heat consumption, and also helps to disperse stress and improve the structural strength of the battery cell terminals.

[0017] Secondly, this utility model also provides a battery cell, comprising:

[0018] The housing has an opening at at least one end;

[0019] The cover plate assembly includes a cover plate body and the aforementioned battery cell terminal. The cover plate body is provided with a mounting hole, the battery cell terminal is inserted into the mounting hole, and the cover plate body is placed over the opening and connected to the housing.

[0020] Beneficial effects: Because the battery cell includes the cell terminals, it has the same effect as the cell terminals, namely, the overall cell terminals have a columnar structure with a track-track-shaped cross-section, resulting in a relatively large current-carrying area and good current-carrying capacity, which is beneficial for the use of high-capacity and fast-charging cells. The first and second terminals are connected by a connector with a smooth beveled structure, replacing the traditional stepped surface structure. This eliminates right-angle edges at the connection between the first and second terminals, facilitating the cold-forging and stamping of the cell terminals. It also facilitates the sliding of the sealing ring from the first terminal and connector to the second terminal, making sealing ring installation easier and ensuring its sealing performance.

[0021] In one optional embodiment, the cover plate assembly further includes an upper insulating member and a riveting block. The cover plate body has a first surface and a second surface disposed opposite to each other along a first direction. The riveting block is connected to the first column and is disposed corresponding to the first surface. The upper insulating member is sandwiched between the riveting block and the cover plate body.

[0022] Beneficial effects: The upper insulating component insulates the battery cell terminals, preventing short circuits caused by direct contact between the battery cell terminals and the cover plate body. The riveting block is used to fix the battery cell terminals, resisting external forces such as vibration and impact, and improving the installation stability of the battery cell terminals.

[0023] In one alternative embodiment, the cover plate assembly further includes a sealing ring and a lower insulating member, the lower insulating member being affixed to the second surface, the base plate being disposed on the side of the lower insulating member away from the second surface, and the sealing ring being sleeved on the outer peripheral wall of the second column and sandwiched between the base plate and the lower insulating member.

[0024] Beneficial effects: The sealing ring improves the sealing performance of the cover assembly, reducing the risk of electrolyte leakage from the battery cell through the cover assembly. The lower insulation component enhances support and also provides insulation, preventing direct contact between the battery cell and the cover body.

[0025] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0026] 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

[0027] 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.

[0028] Figure 1 This is a schematic diagram of the structure of a cover plate assembly for a battery cell according to an embodiment of the present utility model;

[0029] Figure 2 This is an exploded view of a cover plate assembly for a battery cell according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the structure of a battery cell electrode according to an embodiment of the present invention;

[0031] Figure 4 This is a front view of a battery cell electrode post according to an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram of the cross-section of a battery cell electrode according to an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Cover plate body; 101. Mounting hole; 2. Cell terminal post; 201. First column; 202. Connector; 2021. Sloping structure; 203. Second column; 204. Base plate; 205. First cross section; 2051. Circular arc segment; 2052. Straight segment; 3. Upper insulating component; 4. Riveting block; 5. Sealing ring; 6. Lower insulating component. Detailed Implementation

[0035] 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.

[0036] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0037] According to embodiments of the present invention, on the one hand, such as Figure 1 As shown, a battery cell electrode post is provided, mainly comprising: a first column 201, a connector 202, a second column 203, and a base plate 204 connected sequentially along a first direction. The orthographic projections of the first column 201 and the second column 203 along the first direction are both track and field track shaped, and the orthographic projection of the first column 201 is located within the orthographic projection of the second column 203. On the cross-section of the battery cell electrode post 2 along the first direction, the outer wall of the connector 202 has a sloping structure 2021. The first column 201 is adapted to extend to one side of the cover plate body 1 of the battery cell, and the base plate 204 is disposed on the opposite side of the cover plate body 1.

[0038] Therefore, the battery cell terminal provided in this embodiment of the present invention has an overall columnar structure with a track-shaped cross-section. Compared with the traditional circular cross-section, under the premise of limited width of the cover plate body 1, the area of ​​the track-shaped cross-section is larger than that of the circular cross-section. This increases the current-carrying area of ​​the battery cell terminal 2 and improves the current-carrying capacity, enabling the cover plate assembly with the battery cell terminal 2 to meet the needs of larger capacity and faster charging speed battery cells. The first column 201 and the second column 203 are connected by the connector 202. The connector 202 has a smooth inclined surface structure 2021, replacing the traditional stepped surface structure. This eliminates the right-angle edge at the connection between the first column 201 and the second column 203, facilitating the cold forging and stamping of the battery cell terminal 2. It also facilitates the sliding of the sealing ring 5 from the first column 201 and the connector 202 to the second column 203, thus facilitating the installation of the sealing ring 5 and ensuring its sealing performance.

[0039] Specifically, the first direction is the axial direction of the cell electrode 2, which is also the thickness direction of the cover plate body 1, such as... Figure 4 As indicated by arrow H. The cross-sections of both the first column 201 and the second column 203 are formed by connecting two circular arc segments and two straight line segments. Taking the first column 201 as an example, its cross-section is the first section 205, as shown... Figure 5 As shown, the two straight segments 2052 of the first section 205 are spaced apart relative to each other along the width direction of the cover plate body 1, and the two arc segments 2051 are spaced apart relative to each other along the length direction of the cover plate body 1. The two arc segments 2051 are respectively connected to the two ends of the two straight segments 2052 on the same side. The width direction of the cover plate body 1 is as follows: Figure 5 As shown by arrow W in the diagram, the length direction of the cover plate body 1 is as follows: Figure 5As shown by arrow L in the diagram. Correspondingly, the orthographic projection of the connecting body 202 along the first direction is also in the shape of a track and field track. The top surface of the connecting body 202 coincides with the bottom surface of the first column 201, and the bottom surface of the connecting body 202 coincides with the top surface of the second column 203, so that the first column 201 and the second column 203 are smoothly connected to the connecting body 202 respectively.

[0040] Furthermore, after the cover plate assembly of the battery cell is installed with the battery cell housing, the base plate 204 is located inside the cover plate body 1, and the first column 201 needs to extend and partially protrude from the outside of the cover plate body 1. The "inner" and "outer" directions in this embodiment of the present invention are as follows: Figure 1 As shown.

[0041] It should be noted that, due to the influence of the cold heading process, the size of the connector 202 on the battery cell terminal 2 cannot be too small, otherwise it will be difficult to process and form.

[0042] In one embodiment, such as Figure 4 As shown, the dimension of the inclined structure 2021 along the length of the cover plate body 1 is L1, satisfying 0.2mm≤L1≤0.8mm. By controlling the dimension of the inclined structure 2021 along the length of the cover plate body 1 within a suitable range, the cold heading and stamping of the cell electrode 2 is facilitated without occupying space along the length of the cover plate body 1. If the value of L1 is too small, the dimension of the inclined structure 2021 will be too small, making cold heading difficult and resulting in difficulty in forming the cell electrode 2. If the value of L1 is too large, the cell electrode 2 will occupy space along the length of the cover plate body 1.

[0043] Furthermore, in one embodiment, the dimension of the inclined structure 2021 in the width direction of the cover plate body 1 is L2, satisfying 0.2mm≤L2≤0.8mm. Similarly, by controlling the dimension of the inclined structure 2021 in the width direction of the cover plate body 1 within a suitable range, cold heading is facilitated without occupying space in the width direction of the cover plate body 1. If the value of L2 is too small, it will be difficult to form the cell electrode 2 during cold heading; if the value of L2 is too large, it will occupy space in the width direction of the cover plate body 1.

[0044] Furthermore, in one embodiment, the dimension L1 of the inclined structure 2021 in the length direction of the cover plate body 1 is equal to the dimension L2 in the width direction of the cover plate body 1.

[0045] In one embodiment, such as Figure 4As shown, in the first direction, the dimension of the connector 202 is L3, satisfying 0.3mm≤L3≤1mm. By controlling the dimension of the connector 202 in the first direction within a suitable range, cold heading is facilitated, and it does not occupy space in the first direction. It also avoids interference between the connector 202 and the riveting block 4. If the value of L3 is too small, it will be difficult to form the cell electrode 2 during cold heading. If the value of L3 is too large, it will occupy space in the first direction, and the inclined structure 2021 of the connector will easily interfere with the riveting block 4, resulting in greater riveting difficulty.

[0046] In one embodiment, such as Figure 4 As shown, on the cross-section of the cell terminal 2 along the first direction, the angle between the inclined structure 2021 and the plane perpendicular to the first direction is θ, satisfying 20°≤θ≤80°. By controlling the angle θ within a suitable range, the stability of cold heading can be improved, avoiding defects such as edge collapse and damage to the cell terminal 2. If the angle θ is too small, edge collapse defects are likely to occur during cold heading; if the angle θ is too large, the cell terminal 2 is likely to be damaged during cold heading. Taking the positive terminal as an example, the positive terminal is generally made of aluminum. Due to the excessive angle during the cold heading process, the inclined surface is too shaky, which can easily cause aluminum wires to be rubbed out, leading to damage to the positive terminal.

[0047] In one embodiment, such as Figure 3 and Figure 4 As shown, the base plate 204 is elongated, with the long sides of the first column 201 and the second column 203 extending along the length direction of the base plate 204, and the wide sides of the first column 201 and the second column 203 extending along the width direction of the base plate 204. Specifically, the long sides of the first column 201 and the second column 203 are the sides containing the straight line segment 2052, and the wide sides of the first column 201 and the second column 203 are the sides containing the arc segment 2051. Furthermore, the length direction of the base plate 204 is consistent with the length direction of the cover plate body 1, and the width direction of the base plate 204 is consistent with the width direction of the cover plate body 1.

[0048] The long sides of the first column 201 and the second column 203 are set to be consistent with the long side of the base plate 204, and the wide sides of the first column 201 and the second column 203 are set to be consistent with the wide side of the base plate 204. This facilitates the uniform distribution of current, reduces resistance and heat consumption, and also helps to disperse stress and improve the structural strength of the cell electrode 2.

[0049] 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.

[0050] Example 1:

[0051] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.25 mm. In the first direction, the dimension L3 of the connector 202 is 0.95 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 75.26°. The test verification results from the cell production line are shown in Table 1.

[0052] Example 2:

[0053] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.35 mm. In the first direction, the dimension L3 of the connector 202 is 0.86 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 67.85°. The test results from the cell production line are shown in Table 1.

[0054] Example 3:

[0055] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.41 mm. In the first direction, the dimension L3 of the connector 202 is 0.83 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 63.71°. The test results from the cell production line are shown in Table 1.

[0056] Example 4:

[0057] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.48 mm. In the first direction, the dimension L3 of the connector 202 is 0.75 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 57.38°. The test verification results from the cell production line are shown in Table 1.

[0058] Example 5:

[0059] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.52 mm. In the first direction, the dimension L3 of the connector 202 is 0.67 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 52.18°. The test verification results from the cell production line are shown in Table 1.

[0060] Example 6:

[0061] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.59 mm. In the first direction, the dimension L3 of the connector 202 is 0.62 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 46.42°. The test verification results from the cell production line are shown in Table 1.

[0062] Example 7:

[0063] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.67 mm. In the first direction, the dimension L3 of the connector 202 is 0.58 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 40.88°. The test verification results from the cell production line are shown in Table 1.

[0064] Example 8:

[0065] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.72 mm. In the first direction, the dimension L3 of the connector 202 is 0.51 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 35.31°. The test verification results from the cell production line are shown in Table 1.

[0066] Example 9:

[0067] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.78 mm. In the first direction, the dimension L3 of the connector 202 is 0.43 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 28.87°. The test verification results from the cell production line are shown in Table 1.

[0068] Example 10:

[0069] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.61 mm. In the first direction, the dimension L3 of the connector 202 is 0.35 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 29.85°. The test results from the cell production line are shown in Table 1.

[0070] Comparative Example 1:

[0071] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.63 mm. In the first direction, the dimension L3 of the connector 202 is 0.25 mm, which is less than 0.3 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 21.64°. The test verification results from the cell production line are shown in Table 1.

[0072] Comparative Example 2:

[0073] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.48 mm. In the first direction, the dimension L3 of the connector 202 is 0.22 mm, which is less than 0.3 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 24.62°. The test results from the cell production line are shown in Table 1.

[0074] Comparative Example 3:

[0075] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.75 mm. In the first direction, the dimension L3 of the connector 202 is 1.98 mm, which is greater than 1 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 69.25°. The test verification results from the cell production line are shown in Table 1.

[0076] Comparative Example 4:

[0077] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.54 mm. In the first direction, the dimension L3 of the connector 202 is 1.03 mm, which is greater than 1 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 62.33°. The test results from the cell production line are shown in Table 1.

[0078] Comparative Example 5:

[0079] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.15 mm, which is less than 0.2 mm. In the first direction, the dimension L3 of the connector 202 is 0.58 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 75.5°. The test verification results from the cell production line are shown in Table 1.

[0080] Comparative Example 6:

[0081] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.1 mm, which is less than 0.2 mm. In the first direction, the dimension L3 of the connector 202 is 0.32 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 72.65°. The test results from the cell production line are shown in Table 1.

[0082] Comparative Example 7:

[0083] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.95 mm, which is greater than 0.8 mm. In the first direction, the dimension L3 of the connector 202 is 0.47 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 26.32°. The test verification results from the cell production line are shown in Table 1.

[0084] Comparative Example 8:

[0085] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 1.12 mm, which is greater than 0.8 mm. In the first direction, the dimension L3 of the connector 202 is 0.59 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 27.78°. The test verification results from the cell production line are shown in Table 1.

[0086] Comparative Example 9:

[0087] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.85 mm. In the first direction, the dimension L3 of the connector 202 is 0.28 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 18.23°, which is less than 20°. The test verification results from the cell production line are shown in Table 1.

[0088] Comparative Example 10:

[0089] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 1.32 mm. In the first direction, the dimension L3 of the connector 202 is 0.35 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 14.85°, which is less than 20°. The test results from the cell production line are shown in Table 1.

[0090] Comparative Example 11:

[0091] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.31 mm. In the first direction, the dimension L3 of the connector 202 is 1.85 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 80.49°, which is greater than 80°. The test verification results from the cell production line are shown in Table 1.

[0092] Comparative Example 12:

[0093] Along the length of the cover plate body 1, the dimension L1 of the inclined structure 2021 is 0.12 mm, which is less than 0.2 mm. In the first direction, the dimension L3 of the connector 202 is 0.95 mm. On the cross-section of the cell electrode 2 along the first direction, the angle θ between the inclined structure 2021 and the plane perpendicular to the first direction is 82.8°, which is greater than 80°. The test verification results from the cell production line are shown in Table 1.

[0094] Table 1: Test Results

[0095]

[0096] As shown in Table 1, in Examples 1 to 10, the following conditions are met: 0.2mm ≤ L1 ≤ 0.8mm, 0.3mm ≤ L3 ≤ 1mm, and 20° ≤ θ ≤ 80°. Therefore, the cold heading requirements of the battery can be met while saving space.

[0097] In Comparative Examples 1 and 2, L3 is less than 0.3mm, which is lower than the lower limit of the present invention. The height of the connector 202 is too small, and the connector 202 cannot be formed during cold heading.

[0098] In Comparative Examples 3 and 4, L3 is greater than 1 mm, exceeding the lower limit of the present invention. The height of the connector 202 is too large, occupying a large space inside the battery cell, resulting in low space utilization and low energy density of the battery cell.

[0099] In Comparative Examples 5 and 6, L1 is less than 0.2 mm, which is lower than the lower limit of the present invention. The size of the inclined structure 2021 is too small, and the cell electrode post 2 cannot be formed during cold heading.

[0100] In Comparative Examples 7 and 8, L1 is greater than 0.8 mm, exceeding the lower limit of the present invention. The size of the inclined structure 2021 is too large, occupying a large space inside the cell, resulting in low space utilization and low energy density of the cell.

[0101] In Comparative Examples 9 and 10, θ is less than 20°, which is lower than the lower limit value of the present invention, and edge collapse occurs during cold heading.

[0102] In Comparative Examples 11 and 12, θ is greater than 80°, exceeding the lower limit of the present invention, and the cell electrode 2 is damaged during cold heading.

[0103] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing and a cover assembly. The housing has an opening at at least one end, and an electrode assembly is disposed within the housing. The cover assembly includes a cover body 1 and a battery cell electrode post 2. The cover body 1 has a mounting hole 101, into which the battery cell electrode post 2 is inserted. The cover body 1 covers the opening and is connected to the housing.

[0104] The battery cell provided in this embodiment has a columnar structure with a cross-section resembling an athletic track, as the overall structure of the battery cell terminal 2. Compared to the traditional circular cross-section, given the limited width of the cover plate body 1, the area of ​​the athletic track-shaped cross-section is larger than that of the circular cross-section. This increases the current-carrying area of ​​the battery cell terminal 2 and improves its current-carrying capacity, enabling the cover plate assembly with the battery cell terminal 2 to meet the needs of larger capacity and faster charging speeds of battery cells. The first column 201 and the second column 203 are connected by a connector 202. The connector 202 has a smooth inclined surface structure 2021, replacing the traditional stepped surface structure. This eliminates the right-angle edges at the connection between the first column 201 and the second column 203, facilitating the cold forging and stamping of the battery cell terminal 2. It also facilitates the sliding of the sealing ring 5 from the first column 201 and the connector 202 to the second column 203, making it easier to install the sealing ring 5 and ensuring its sealing performance.

[0105] Specifically, a tab is provided on one side of the electrode assembly. The tab includes a positive tab and a negative tab. The cell terminal 2 includes a positive terminal and a negative terminal, wherein the positive tab is electrically connected to the positive terminal and the negative tab is electrically connected to the negative terminal. The connection between the cover plate body 1 and the housing can be selected from any existing connection structure as needed; therefore, this embodiment of the utility model does not impose excessive restrictions on this.

[0106] 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.

[0107] In one embodiment, such as Figure 2 As shown, the cover plate assembly also includes an upper insulating member 3 and a riveting block 4. The cover plate body 1 has a first surface and a second surface that are arranged opposite to each other along a first direction. The riveting block 4 is connected to the first post 201 and is arranged corresponding to the first surface. The upper insulating member 3 is sandwiched between the riveting block 4 and the cover plate body 1. The upper insulating member 3 is used to insulate the battery cell terminal 2, preventing the battery cell terminal 2 from directly contacting the cover plate body 1 and causing a short circuit. The riveting block 4 is used to fix the battery cell terminal 2, and can resist external forces such as vibration and impact, improving the installation stability of the battery cell terminal 2.

[0108] Specifically, the first surface of the cover plate body 1 is located on the outer side, and the second surface is located on the inner side.

[0109] In one embodiment, such as Figure 1 and Figure 2 As shown, the cover assembly also includes a sealing ring 5 and a lower insulating member 6. The lower insulating member 6 is attached to the second surface, and the base plate 204 is located on the side of the lower insulating member 6 away from the second surface. The sealing ring 5 is sleeved on the outer peripheral wall of the second column 203 and sandwiched between the base plate 204 and the lower insulating member 6. The sealing ring 5 is used to improve the sealing performance of the cover assembly and reduce the risk of electrolyte leakage from the battery cell through the cover assembly. The lower insulating member 6 can improve the support effect and also serves as insulation to prevent direct contact between the battery cell and the cover body 1.

[0110] Specifically, the base plate 204 is located inside the lower insulating member 6, the second column 203 passes through the lower insulating member 6 and the cover plate body 1, the sealing ring 5 is sleeved on the outer peripheral wall of the second column 203, the connecting body 202 and the first column 201 are fixed by the riveting block 4, and the first column 201 extends through the riveting block 4 to the outside of the riveting block 4.

[0111] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: at least one battery cell.

[0112] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0113] 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.

[0114] 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 battery cell terminal, characterized in that, include: A first column, a connecting body, a second column, and a base plate are sequentially connected along a first direction. The orthographic projections of the first column and the second column along the first direction are both in the shape of an athletic track, and the orthographic projection of the first column is located within the orthographic projection of the second column. On the cross-section of the battery cell electrode along the first direction, the outer wall of the connecting body has a sloping structure. The first column is adapted to extend to one side of the cover plate body of the battery cell, and the base plate is located on the opposite side of the cover plate body.

2. The cell terminal according to claim 1, characterized in that, Along the length of the cover plate body, the dimension of the inclined structure is L1, which satisfies 0.2mm≤L1≤0.8mm.

3. The cell electrode post according to claim 2, characterized in that, In the width direction of the cover plate body, the dimension of the inclined structure is L2, which satisfies 0.2mm≤L2≤0.8mm.

4. The cell terminal according to claim 3, characterized in that, In the first direction, the dimension of the connector is L3, which satisfies 0.3mm≤L3≤1mm.

5. The cell terminal according to claim 4, characterized in that, On the cross-section of the battery cell electrode along the first direction, the angle between the inclined structure and the plane perpendicular to the first direction is θ, satisfying 20°≤θ≤80°.

6. The cell terminal according to any one of claims 1 to 4, characterized in that, The base plate is elongated, with the long sides of the first and second columns extending along the length of the base plate and the wide sides extending along the width of the base plate.

7. A battery cell, characterized in that, include: The housing has an opening at at least one end; A cover plate assembly includes a cover plate body and a cell electrode post according to any one of claims 1 to 6, wherein the cover plate body is provided with a mounting hole, the cell electrode post is inserted into the mounting hole, and the cover plate body is disposed on the opening and connected to the housing.

8. The battery cell according to claim 7, characterized in that, The cover plate assembly further includes an upper insulating member and a riveting block. The cover plate body has a first surface and a second surface that are disposed opposite to each other along a first direction. The riveting block is connected to the first column and is disposed corresponding to the first surface. The upper insulating member is sandwiched between the riveting block and the cover plate body.

9. The battery cell according to claim 8, characterized in that, The cover plate assembly also includes a sealing ring and a lower insulating member. The lower insulating member is attached to the second surface, and the bottom plate is located on the side of the lower insulating member away from the second surface. The sealing ring is sleeved on the outer peripheral wall of the second column and sandwiched between the bottom plate and the lower insulating member.

10. A battery pack, characterized in that, include: At least one battery cell according to any one of claims 7 to 9.

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