Battery cell
By designing a battery cell structure with a flat plate-shaped connecting piece and an integrated pole column, the problem of large space occupancy of existing lithium battery cell connecting piece is solved, the capacity and space utilization of the battery cell is improved, and the safety performance is improved.
Patent Information
- Application Number
- CN202421577687.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The connecting plates of existing lithium battery cells are long, resulting in large space occupancy and reducing the capacity and space utilization of the battery cells.
A battery cell is designed in which the connecting piece is changed to a flat plate shape, directly into the shell and welded with the pole ears of the pole group, and the pole column is integrated on the connecting piece to reduce space occupation.
By reducing the folding structure of the connecting piece, space is saved, the capacity and space utilization of the battery cell are improved, while simplifying the assembly process and improving safety performance.
Smart Images
Figure CN222953328U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery cell. Background Art
[0002] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. Lithium batteries are the core components of battery packs, and their structural design is crucial to the batteries. At present, lithium batteries often use connecting plates to weld the poles integrated on the cover plate to the pole ears of the pole group in the shell. Therefore, it is necessary to design the connecting plates to be longer, weld one end of the connecting plates to the pole ears of the pole group in the shell, and weld the other end of the connecting plates to the poles on the cover plate outside the shell. After the welding is completed, the connecting plates are folded into the shell several times, and finally the cover plate assembly is just sealed at the open end of the shell. The connecting plates of this structure occupy a large space, which reduces the space utilization inside the battery cell, thereby reducing the capacity of the battery cell. Utility Model Content
[0003] The purpose of the present application is to provide a battery cell, which to a certain extent solves the technical problem that the connecting piece of the lithium battery cell in the prior art is long, one end of which is welded to the pole ear of the pole group in the shell, and the other end of which is welded to the pole post on the cover plate outside the shell, and then the connecting piece is folded into the shell, which occupies a large space, reduces the space utilization inside the battery cell, and thus reduces the capacity of the battery cell.
[0004] The present application provides a battery cell, comprising: a shell, a pole group, a cover plate assembly, a connecting piece, a pole column and a press-fit component; wherein the pole group, the connecting piece and the pole column are all installed in the shell, and the connecting piece is respectively connected to the pole column and the pole ear of the pole group, and the connecting piece is in a flat plate shape;
[0005] An opening is formed at at least one end of the shell along a first preset direction, and the cover assembly covers the opening; the press-fitting component is inserted into the cover body of the cover assembly, and the press-fitting component is formed with a mounting through hole, the pole is inserted into the mounting through hole, and extends to the outside of the cover body of the cover assembly through the mounting through hole; the pole is connected to the press-fitting component by welding.
[0006] In the above technical solution, further, a part of the structure of the connecting piece is arranged on a side of the pole lug close to the pole group, and another part of the structure of the connecting piece and the pole column are arranged on the side of the pole lug.
[0007] In any of the above technical solutions, further, at least two oppositely arranged limiting protrusions are formed on one side of the cover plate body close to the pole group, and at least two of the limiting protrusions respectively abut against opposite side portions of the press-fitting component.
[0008] In any of the above technical solutions, further, the pole and the connecting piece are an integrated structure; or the pole and the connecting piece are connected by welding.
[0009] In any of the above technical solutions, further, the battery cell also includes an upper plastic part and a fixing component; wherein the upper plastic part is installed on a side surface of the cover plate body away from the pole group, and the upper plastic part is arranged around the outside of the press-fit component; the upper plastic part is formed with a groove, the fixing component is installed in the groove, and is sleeved on the outside of the press-fit component.
[0010] In any of the above technical solutions, further, the press-fitting component includes a first-level step portion, a second-level step portion and a third-level step portion connected in sequence; wherein, along the first preset direction, the projection area of the first-level step portion, the projection area of the second-level step portion and the projection area of the third-level step portion decrease in sequence, and the centers of the projections of the three coincide;
[0011] The first-level step portion abuts against a side of the cover plate body close to the pole group; the second-level step portion is inserted into the cover plate body; and the third-level step portion is inserted into the fixing component.
[0012] In any of the above technical solutions, further, along the first preset direction, the center lines of the pole and the three-step portion coincide with each other, and in the length direction of the cover plate body, the maximum width of the pole is W1, and the maximum width of the three-step portion is W2, wherein 4mm≤W1≤8mm, and W1-W2≥1.6mm.
[0013] In any of the above technical solutions, further, the fixing component and the press-fit component are connected by welding or riveting.
[0014] In any of the above technical solutions, further, the battery cell also includes a sealing ring, the cover plate body is formed with a through hole, the press-fit component is inserted into the through hole, and the sealing ring is pressed between the outer wall of the press-fit component and the inner wall of the installation through hole.
[0015] In any of the above technical solutions, further, the cover plate body includes a cover plate and a lower plastic part, and the lower plastic part is installed on one side surface of the cover plate close to the pole group, and the press-fitting component is sequentially inserted into the lower plastic part and the cover plate.
[0016] In any of the above technical solutions, further, the battery cell also includes an explosion-proof valve, which is installed on at least one small side of the shell along a second preset direction, and the explosion-proof valve is connected to the interior of the shell, wherein the second preset direction is perpendicular to the first preset direction.
[0017] In any of the above technical solutions, further, the battery cell also includes an auxiliary mounting plate, the auxiliary mounting plate is arranged on a side of the pole group close to the explosion-proof valve, and the auxiliary mounting plate is formed with a first exhaust through hole connected to the explosion-proof valve;
[0018] The battery core further includes a plurality of replaceable inserts, the auxiliary mounting plate is formed with a mounting through hole at a position corresponding to the explosion-proof valve, and the plurality of replaceable inserts can be replaceably mounted in the mounting through hole, and the replaceable insert is formed with a second exhaust through hole communicating with the explosion-proof valve;
[0019] A cavity recessed toward the outside of the shell is formed on the side of the shell, and the explosion-proof valve is installed in the cavity.
[0020] Compared with the prior art, the beneficial effects of this application are:
[0021] The present application changes the matching structure of the connecting piece, the pole ear and the pole, and changes the connecting piece into a flat structure, which is no longer folded, so that the connecting piece can be directly inserted into the shell and welded to the pole ear of the pole group. In addition, the pole is integrated on the upper surface of the connecting piece. Therefore, when the connecting piece and the pole ear are welded, the press-fit component integrated on the cover plate assembly can be directly mounted on the pole, and finally the pole and the press-fit component can be welded externally, thereby greatly saving space, improving the space utilization inside the battery cell, and thereby greatly improving the capacity of the battery cell.
[0022] In addition, since the installation operations of the connecting piece and the pole ear, and the installation operations of the pole ear integrated on the connecting piece and the press-fit component integrated on the cover assembly can be performed separately, the thermal impact of welding on the sealing ring, lower plastic parts, etc. of the cover assembly can be avoided, which helps to improve the safety performance of the battery cell. Moreover, the manufacturing precision requirements are low, which is conducive to ensuring the performance of the cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0024] Figure 1An exploded schematic diagram of the cover plate portion and the pole ear of the pole group provided in an embodiment of the present application;
[0025] Figure 2 An assembly diagram of the cover plate portion and the tab provided in an embodiment of the present application;
[0026] Figure 3 Another assembly diagram of the cover plate part and the tab provided in the embodiment of the present application;
[0027] Figure 4 Another assembly diagram of the cover plate part and the tab provided in the embodiment of the present application;
[0028] Figure 5 for Figure 4 Cross-sectional view along section AA;
[0029] Figure 6 for Figure 5 A schematic diagram of a local enlarged structure;
[0030] Figure 7 An exploded schematic diagram of a battery cell provided in an embodiment of the present application.
[0031] Reference numerals:
[0032] 1-shell, 2-pole group, 21-pole ear, 3-cover body, 31-cover, 32-lower plastic part, 33-limiting protrusion, 4-connecting plate, 5-pole, 6-pressed component, 61-first step portion, 62-second step portion, 63-third step portion, 7-upper plastic part, 8-fixing component, 9-sealing ring, 10-explosion-proof valve, 11-auxiliary mounting plate, 111-first exhaust through hole, 112-mounting through hole, 12-replaceable insert, 121-second exhaust through hole, 13-Mylar film. DETAILED DESCRIPTION
[0033] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.
[0034] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.
[0035] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.
[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0038] Refer to the following Figures 1 to 7 The battery cell according to some embodiments of the present application is described.
[0039] See also Figures 1 to 7 As shown, an embodiment of the present application provides a battery cell, comprising: a housing 1, a pole group 2, a cover plate assembly, a connecting piece 4, a pole 5 and a press-fitting component 6; wherein the pole group 2, the connecting piece 4 and the pole 5 are all installed in the housing 1, and the connecting piece 4 is respectively connected to the pole 5 and the pole ear 21 of the pole group 2, and the connecting piece 4 is in a flat plate shape;
[0040] An opening is formed on at least one end of the shell 1 along the first preset direction a, and the cover assembly covers the opening; the press-fitting component 6 is inserted into the cover body 3 of the cover assembly, and the press-fitting component 6 is formed with a mounting through hole 112, the pole 5 is inserted into the mounting through hole 112, and extends to the outside of the cover body 3 of the cover assembly through the mounting through hole 112; the pole 5 is connected to the press-fitting component 6 by welding.
[0041] Based on the structure described above, it can be known that during the assembly process of the battery cell provided in the present application, the flat connecting piece 4 can first be directly placed in the shell 1 and welded together with the pole ear 21 of the pole group 2, and then the mounting through hole 112 of the press-fit component 6 assembled with the cover plate assembly is aligned with the pole 5 on the connecting piece 4, and is sleeved on the pole 5, and is welded together with the press-fit component 6 at the exposed end of the pole 5, which is simple and convenient to operate.
[0042] It can be seen that the matching structure of the connecting piece 4, the pole ear 21 and the pole 5 is changed in the present application, and the connecting piece 4 is changed into a flat plate structure and is no longer folded, so that the connecting piece 4 can be directly inserted into the shell and welded together with the pole ear 21 of the pole group 2. In addition, the pole 5 is integrated on the upper surface of the connecting piece 4. Therefore, after the welding of the connecting piece 4 and the pole ear 21 is completed, the press-fit component 6 integrated on the cover plate assembly can be directly sleeved on the pole 5, and finally the pole 5 and the press-fit component 6 can be welded on the outside, thereby greatly saving space, improving the space utilization inside the battery cell, and thus greatly improving the capacity of the battery cell.
[0043] In addition, since the installation operations of the connecting piece 4 and the pole ear 21, and the installation operations of the pole 5 integrated on the connecting piece 4 and the press-fit component 6 integrated on the cover assembly can be performed separately, the thermal impact of welding on the sealing ring 9, the lower plastic part 32, etc. can be avoided, which helps to improve the safety performance of the battery cell, and the manufacturing precision requirements are low, which is conducive to ensuring the performance of the cover.
[0044] It should be noted that: the first preset direction a can be the height direction of the shell 1. For example, for a square shell battery cell, a cover assembly is provided on at least one end of the shell 1 along the height direction of the shell 1; the first preset direction a can be the length direction of the shell 1. For example, for a blade battery cell, it can also be the length direction of the shell 1. A cover assembly is provided on at least one end of the shell 1 along the length direction of the shell 1.
[0045] The battery cell provided in this embodiment is a blade battery cell, and the first preset direction a is the length direction of the shell 1. This will be used as an example for explanation below. Of course, it is not limited to this, and the type of battery cell may also change accordingly, such as a square shell battery cell.
[0046] In this embodiment, preferably, Figure 3 , Figure 5 and Figure 6 As shown, a portion of the connecting sheet 4 is arranged on the side of the flattened pole ear 21 close to the pole group 2, that is, the flattened pole ear 21 is L-shaped, a portion of the connecting sheet 4 can be located in the hollow area of the L-shape, and another portion of the connecting sheet 4 and the pole 5 are both arranged on the side of the pole ear 21.
[0047] According to the structure described above, a portion of the connecting sheet 4 extends to the bottom of the flat pole ear 21, that is, a portion of the connecting sheet 4 extends to the space formed between the pole ear 21 and the pole group 2 body, further saving space in the height direction, improving the space utilization inside the battery cell, and thus greatly improving the capacity of the battery cell.
[0048] In this embodiment, preferably, Figure 5 and Figure 6As shown, two oppositely disposed limiting protrusions 33 are formed on one side of the cover plate body 3 close to the pole group 2 , and the two limiting protrusions 33 respectively abut against two opposite sides of the press-fitting component 6 .
[0049] According to the structure described above, the two limiting protrusions 33 play a role in limiting the press-fitting component 6, so that the press-fitting component 6 and the cover plate body 3 are assembled more firmly and stably.
[0050] Further, preferably, the limiting protrusion 33 may be a cylindrical protrusion, but is not limited thereto and may also be a prism, etc., and is specifically designed according to actual needs.
[0051] It should be noted that the number of the limiting protrusions 33 is not limited to two, and the number of the limiting protrusions 33 may be more than two, for example, three or four.
[0052] In this embodiment, preferably, Figure 1 As shown, the pole 5 and the connecting piece 4 are an integrated structure, which has high overall strength, is not easy to be damaged, and does not require subsequent processing.
[0053] Of course, the pole 5 and the connecting piece 4 are not limited to the above-mentioned integrated structure, and other structures can also be used. For example, the pole 5 and the connecting piece 4 can be split structures and connected by welding to save materials.
[0054] In this embodiment, preferably, Figure 1 and Figure 6 As shown, the battery cell further includes an upper plastic part 7 and a fixing member 8; wherein the upper plastic part 7 is mounted on a surface of the cover body 3 that is away from the electrode group 2, and the upper plastic part 7 is arranged around the outside of the press-fitting member 6;
[0055] The upper plastic part 7 is formed with a groove, and the fixing component 8 is installed in the groove. It can be seen that the upper plastic part 7 can isolate the fixing component 8 and the cover plate 31, and the fixing component 8 is sleeved on the outside of the press-fit component 6, wherein the fixing component 8 plays a role in fixing the press-fit component 6, and the upper plastic part 7 plays a role in insulation protection.
[0056] In this embodiment, preferably, Figure 6 As shown, the press-fitting component 6 includes a primary step portion 61, a secondary step portion 62 and a tertiary step portion 63 connected in sequence; wherein, along the first preset direction a, in the height direction of the pole group 2 in this embodiment, the projection area of the primary step portion 61, the projection area of the secondary step portion 62 and the projection area of the tertiary step portion 63 decrease in sequence, and the centers of the projections of the three coincide;
[0057] The first-level step portion 61 abuts against a side of the cover plate body 3 close to the pole group 2 ; the second-level step portion 62 penetrates the cover plate body 3 ; and the third-level step portion 63 penetrates the fixing member 8 .
[0058] According to the structure described above, it can be known that the press-fitting component 6 is designed to be a step-like structure, so that each step of the press-fitting component 6 can be matched with the corresponding structure to achieve different functions, for example: the first-level step portion 61 abuts against the side of the cover plate body 3 close to the pole group 2, playing a limiting role; the second-level step portion 62 is inserted in the cover plate body 3, which can achieve stable assembly with the cover plate body 3, and the upper end surface of the second-level step abuts against the bottom surface of the fixing component 8, which also plays a limiting role; the third-level step portion 63 is inserted in the fixing component 8, which can achieve stable assembly with the fixing component 8.
[0059] In this embodiment, preferably, Figure 6 As shown, along the first preset direction a, the center lines of the pole 5 and the three-step step 63 coincide with each other, and in the length direction c of the cover body 3, the maximum width of the pole 5 is W1, and the maximum width of the three-step step 63 is W2, wherein 4mm≤W1≤8mm, and W1-W2≥1.6mm.
[0060] According to the structure described above, it can be seen that 4mm≤W1≤8mm is set to ensure that the pole 5 has a certain strength, the structure is more stable, and it is not easy to deform; and W1-W2≥1.6mm is set to ensure that the press-fitting component 6 has a certain wall thickness, so that it has a certain strength, and then the pole 5 can be press-fitted, and its deformation is avoided, etc., to ensure the stability and reliability of the structure.
[0061] Further, preferably, the pole 5 is cylindrical, and W1 is the diameter of the pole 5; the aforementioned primary step portion 61, secondary step portion 62, and tertiary step portion 63 are all cylindrical, and W2 is the diameter of the tertiary step portion 63. Of course, the shapes of the pole 5, the primary step portion 61, the secondary step portion 62, and the tertiary step portion 63 are not limited to the above, and can also be designed according to actual needs.
[0062] It should be noted that the ranges of W1 and W2 are not limited to the above, and can also be designed according to actual needs.
[0063] In this embodiment, preferably, Figure 6 As shown, the fixing member 8 and the press-fitting member 6 are connected by riveting, and this operation can be performed separately, which is more convenient and makes the connection between the two more stable and firm, which is beneficial to improving the performance of the cover plate.
[0064] It should be noted that the connection method between the fixed component 8 and the press-fit component 6 is not limited to the above-mentioned riveting method. The fixed component 8 and the press-fit component 6 can also be connected by other methods. For example, the fixed component 8 and the press-fit component 6 can also be connected by welding, which is specifically designed according to actual needs.
[0065] In this embodiment, preferably, Figure 6 As shown, the battery cell further includes a sealing ring 9 , the cover plate body 3 is formed with a through hole, the press-fit component 6 is inserted into the through hole, and the sealing ring 9 is pressed between the outer wall of the press-fit component 6 and the inner wall of the mounting through hole 112 .
[0066] According to the structure described above, the sealing ring 9 plays the role of sealing and insulating the press-fit component 6 and the cover plate 31 .
[0067] Furthermore, preferably, the sealing ring 9 is in a convex-shaped structure, which is sleeved on the outside of the secondary step portion 62 of the press-fit component 6, and the bottom surface of the convex-shaped structure abuts against the upper end surface of the primary step, thereby supporting and limiting the sealing ring 9, so that the sealing ring 9 and the press-fit component 6 are more stably and firmly matched.
[0068] In this embodiment, preferably, Figures 1 to 3 , Figure 6 and Figure 7 As shown, the cover body 3 includes a cover 31 and a lower plastic part 32 , and the lower plastic part 32 is installed on a side surface of the cover 31 close to the electrode group 2 , and the press-fitting component 6 is inserted in the lower plastic part 32 and the cover 31 in sequence.
[0069] According to the structure described above, the cover plate 31 serves as the main supporting structure, and the lower plastic part 32 plays the role of insulation protection. This part is an existing structure and will not be described in detail here.
[0070] Further, preferably, the aforementioned limiting protrusion 33 is formed on a side of the lower plastic part 32 facing away from the cover plate 31 .
[0071] In this embodiment, preferably, Figure 7 As shown, the battery cell also includes an explosion-proof valve 10, and the explosion-proof valve 10 is installed on at least one small side of the shell 1 along the second preset direction b, and the explosion-proof valve 10 is connected to the interior of the shell 1, wherein the second preset direction b is perpendicular to the first preset direction a. In the present embodiment, preferably, the second preset direction b is the height direction. Of course, it is not limited to this. As the type of battery cell changes, the orientation of the second preset direction b changes accordingly. In addition, it should be noted that the large side refers to the main expansion side of the battery cell. In the present embodiment, the large side is the side formed by the long side and the wide side, and the small side of the shell 1 along the second preset direction b refers to the side formed by the long side and the wide side.
[0072] According to the structure described above, the explosion-proof valve 10 is arranged at the top of the shell 1. When thermal runaway occurs, the exhaust path is shorter than when the explosion-proof valve 10 is arranged at the top or bottom of the shell 1, thereby achieving rapid exhaust.
[0073] In this embodiment, preferably, Figure 7 As shown, the battery cell also includes an auxiliary mounting plate 11 arranged in the shell 1, the auxiliary mounting plate 11 is arranged on the side of the pole group 2 close to the explosion-proof valve 10, and the auxiliary mounting plate 11 is formed with a first exhaust through hole 111 connected to the explosion-proof valve 10. It can be seen that the auxiliary mounting plate 11 is designed between the pole group 2 and the explosion-proof valve 10, so it is necessary to open the aforementioned first exhaust through hole 111 on the auxiliary mounting plate 11 to form an exhaust path for exhaust, and preferably, the number of the first exhaust through holes 111 is multiple.
[0074] Furthermore, preferably, there are two auxiliary mounting plates 11 , which are respectively arranged on both sides of the pole group 2 along the length direction of the pole group 2 , so as to facilitate the operation of inserting the pole group 2 into the shell and protect the pole group 2 from being scratched by the shell 1 .
[0075] Further, preferably, explosion-proof valves 10 may be provided on the outer sides of both auxiliary mounting plates 11. Of course, this is not limited thereto, and explosion-proof valves 10 may be provided on the outer side of only one auxiliary mounting plate 11. The specific design is based on actual needs.
[0076] Further, preferably, Figure 7 As shown, the outside of the electrode group 2 is wrapped with a Mylar film 13 , and the cover plate body 3 is arranged on the outside of the Mylar film 13 .
[0077] In this embodiment, preferably, Figure 7 As shown, the battery cell also includes a plurality of replaceable inserts 12, and a mounting through hole 112 is formed at a position of the auxiliary mounting plate 11 corresponding to the explosion-proof valve 10, and the plurality of replaceable inserts 12 can be replaceably installed in the mounting through hole 112, and the replaceable insert 12 is formed with a second exhaust through hole 121 connected to the explosion-proof valve 10, and preferably, the number of the second exhaust through holes 121 is multiple.
[0078] According to the structure described above, it can be known that a plurality of replaceable inserts 12 are designed so that at least one of the shape, density or arrangement of the second exhaust holes 121 on each replaceable insert 12 is different, and then a suitable replaceable insert 12 can be selected according to actual needs and installed in the aforementioned installation hole 112, thereby achieving rapid exhaust.
[0079] In this embodiment, preferably, Figure 7 As shown, a cavity recessed toward the outside of the housing 1 is formed on the side of the housing 1, and the explosion-proof valve 10 is installed in the cavity.
[0080] According to the structure described above, the shell 1 is recessed toward the outside to form a cavity, which can be used to install the explosion-proof valve 10 to avoid occupying the installation space of the electrode group 2, which helps to improve the energy density.
[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery cell, characterized in that: include: A housing, a pole group, a cover plate assembly, a connecting piece, a pole column and a press-fit component; wherein the pole group, the connecting piece and the pole column are all installed in the housing, and the connecting piece is respectively connected to the pole column and the pole lug of the pole group, and the connecting piece is in a flat plate shape; An opening is formed at at least one end of the shell along a first preset direction, and the cover assembly covers the opening; the press-fitting component is inserted into the cover body of the cover assembly, and the press-fitting component is formed with a mounting through hole, the pole is inserted into the mounting through hole, and extends to the outside of the cover body of the cover assembly through the mounting through hole; the pole is connected to the press-fitting component by welding.
2. The battery cell according to claim 1, characterized in that: A part of the structure of the connecting piece is arranged on a side of the pole ear close to the pole group, and another part of the structure of the connecting piece and the pole column are arranged on the side of the pole ear.
3. The battery cell according to claim 1, characterized in that: At least two oppositely arranged limiting protrusions are formed on one side of the cover plate body close to the pole group, and at least two of the limiting protrusions are respectively pressed against two opposite sides of the press-fitting component; and / or The pole and the connecting piece are an integrated structure; or the pole and the connecting piece are connected by welding.
4. The battery cell according to claim 1, characterized in that: The battery cell also includes an upper plastic part and a fixing component; wherein the upper plastic part is installed on a side surface of the cover plate body away from the pole group, and the upper plastic part is arranged around the outside of the press-fit component; the upper plastic part is formed with a groove, the fixing component is installed in the groove, and is sleeved on the outside of the press-fit component.
5. The battery cell according to claim 4, characterized in that: The press-fitting component comprises a first-level step portion, a second-level step portion and a third-level step portion connected in sequence; wherein, along the first preset direction, the projection area of the first-level step portion, the projection area of the second-level step portion and the projection area of the third-level step portion decrease in sequence, and the centers of the projections of the three coincide; The first-level step portion abuts against a side of the cover plate body close to the pole group; the second-level step portion is inserted into the cover plate body; and the third-level step portion is inserted into the fixing component.
6. The battery cell according to claim 5, characterized in that: Along the first preset direction, the center lines of the pole and the three-step portion coincide with each other, and in the length direction of the cover plate body, the maximum width of the pole is W1, and the maximum width of the three-step portion is W2, wherein 4mm≤W1≤8mm, and W1-W2≥1.6mm.
7. The battery cell according to claim 4, characterized in that: The fixing component and the press-fitting component are connected by welding or riveting.
8. The battery cell according to claim 1, characterized in that: The battery cell further includes a sealing ring, the cover plate body is formed with a through hole, the press-fitting member is inserted into the through hole, and the sealing ring is pressed between the outer wall of the press-fitting member and the inner wall of the mounting through hole; and / or The cover plate body comprises a cover plate and a lower plastic part, and the lower plastic part is installed on a side surface of the cover plate close to the pole group, and the press-fitting component is sequentially inserted through the lower plastic part and the cover plate.
9. The battery cell according to any one of claims 1 to 8, characterized in that: The battery cell further includes an explosion-proof valve, which is installed on at least one small side of the shell along a second preset direction and is connected to the interior of the shell, wherein the second preset direction is perpendicular to the first preset direction.
10. The battery cell according to claim 9, characterized in that: The battery cell further includes an auxiliary mounting plate, which is disposed on a side of the pole group close to the explosion-proof valve, and the auxiliary mounting plate is formed with a first exhaust through hole connected to the explosion-proof valve; The battery core further includes a plurality of replaceable inserts, the auxiliary mounting plate is formed with a mounting through hole at a position corresponding to the explosion-proof valve, and the plurality of replaceable inserts can be replaceably mounted in the mounting through hole, and the replaceable insert is formed with a second exhaust through hole communicating with the explosion-proof valve; A cavity recessed toward the outside of the shell is formed on the side of the shell, and the explosion-proof valve is installed in the cavity.