Battery monomer, battery pack and power device
By using a connecting piece to connect the pole ear and pole pillar in the battery cell, problems such as low space utilization and pole ear tear in the prior art are solved, and higher space energy density and safer battery cell design are achieved.
Patent Information
- Application Number
- CN202421527935.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the prior art, the space utilization rate of the battery cell is low, the extreme ears are at risk of tearing, and the cover plate and pole bottom plate welding connection sheet has the risk of hot melting of the plastic parts, resulting in performance failure.
By introducing a connecting piece into the battery cell, the pole ears and pole pillars are connected to avoid tearing of the pole ears and improve overall packaging density and structural compactness.
It improves the space utilization rate and space energy density of the battery cell, reduces assembly difficulty and hot melting risks, and improves overall performance and safety performance.
Smart Images
Figure CN222915092U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power device manufacturing, and in particular to a battery cell, a battery pack and a power device. Background Art
[0002] In the related art, it is pointed out that currently, components such as positive and negative electrode posts, riveting blocks, upper plastic parts, lower plastic parts and sealing rings are all arranged on the cover plate. The connecting piece is first welded to the cover plate, and then the tab (which needs to be bent) of the electrode group is welded to the connecting piece welded to the cover plate. The cover plate is then welded to the housing to form a seal. This solution has low space utilization rate and there is a risk of tab tearing, and there is a risk of thermal melting of the lower plastic part when welding the connecting piece to the electrode post bottom plate of the cover plate, resulting in performance failure. Summary of the Utility Model
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a battery cell, in which the internal connection is reliable and the space utilization rate is high.
[0004] The utility model also provides a battery pack having the above battery cell.
[0005] The utility model also provides a power device having the above battery pack.
[0006] The battery cell according to the first aspect of the utility model includes: a housing, the housing is formed with a receiving cavity and a mounting hole; an electrode group, the electrode group is disposed in the receiving cavity, and the electrode group has tabs; an electrode post assembly, the electrode post assembly is disposed in the mounting hole; a connecting piece, the connecting piece includes a first welding portion and a second welding portion, the first welding portion is electrically connected to the tab, the second welding portion is bendably connected to the first welding portion, and the second welding portion is electrically connected to the electrode post assembly.
[0007] According to the battery cell of the utility model, the tab and the electrode post are connected by the connecting piece, avoiding tab tearing, improving the overall packaging density and structural compactness of the battery cell, having high space utilization rate, enhancing the space energy density of the battery cell, and having a clever structural design, reducing the assembly difficulty and improving the assembly efficiency.
[0008] In some embodiments, the electrode post assembly includes: an electrode post body, the electrode post body is formed with a through hole and a first groove, and the second welding portion is adapted to pass through the through hole and bend in the first groove; an upper plastic part, the upper plastic part is sleeved on the electrode post body; a welding block, the welding block is disposed in the first groove and is welded to the second welding portion.
[0009] In some embodiments, the electrode post assembly further includes: a sealing ring, the sealing ring is disposed in the receiving cavity and is located between the electrode post body and the housing.
[0010] In some embodiments, a second groove is further formed in the pole column body. The first groove communicates with the second groove through the through hole, and the tab is located in the second groove.
[0011] In some embodiments, the bottom wall of the first groove is formed as a welding surface, and the second welding portion is welded to the welding surface.
[0012] In some embodiments, the pole column body further forms a riveting portion, the riveting portion is located in the accommodating cavity, and the battery cell further includes a lower plastic part, and the lower plastic part is arranged in the accommodating cavity and located between the riveting portion and the housing.
[0013] In some embodiments, the connecting piece includes a first segment, a connecting segment and a second segment connected in sequence. The first segment and the second segment both extend along a first direction, the connecting segment extends along a second direction, the connecting segment is located in the through hole, the first welding portion is formed on the first segment, and the second welding portion is formed on the second segment.
[0014] In some embodiments, the battery cell further includes an explosion-proof valve. An explosion-proof hole is formed in the housing, and the explosion-proof valve is arranged in the explosion-proof hole and connected to the housing.
[0015] The battery pack according to the second aspect of the present invention includes the battery cell according to the first aspect of the present invention above.
[0016] By providing the battery cell according to the first aspect above, the battery pack according to the present invention improves the safety performance of the battery pack, improves the utilization rate of the internal space of the battery pack, increases the volume energy density of the battery pack, and reduces the danger of the battery pack.
[0017] The power device according to the third aspect of the present invention includes the battery pack according to the second aspect of the present invention above.
[0018] By providing the battery pack according to the second aspect above, the power device according to the present invention improves the overall performance of the power device and enhances the safety performance of the power device.
[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings
[0020] Figure 1 It is a schematic diagram of a battery cell according to an embodiment of the present invention;
[0021] Figure 2 isFigure 1 A top view schematic diagram of the battery cell shown in
[0022] Figure 3 is Figure 2 A schematic diagram of the A-A cross-section of the battery cell shown in
[0023] Figure 4 is Figure 3 A partially enlarged schematic diagram of the battery cell shown in
[0024] Figure 5 is Figure 1 A schematic diagram of the battery cell shown in , where the welding block is not assembled;
[0025] Figure 6 is Figure 5 A schematic diagram of another perspective of the battery cell shown in
[0026] Figure 7 is Figure 6 A top view schematic diagram of the battery cell shown in
[0027] Figure 8 is Figure 7 A schematic diagram of the B-B cross-section of the battery cell shown in
[0028] Figure 9 is Figure 1 A schematic diagram of the battery cell shown in , where the first welding part is bent and located in the first groove;
[0029] Figure 10 is Figure 9 A top view schematic diagram of the battery cell shown in
[0030] Figure 11 is Figure 10 A schematic diagram of the C-C cross-section of the battery cell shown in
[0031] Figure 12 is Figure 1 A schematic diagram of the battery cell shown in , where the electrode group is not assembled;
[0032] Figure 13 is Figure 12 A schematic diagram of another perspective of the battery cell shown in
[0033] Figure 14 is Figure 12 A top view schematic diagram of the battery cell shown in
[0034] Figure 15 is Figure 14 A schematic diagram of the D-D cross-section of the battery cell shown in
[0035] Figure 16 is Figure 4 The assembly schematic diagram of the connecting piece of the battery cell and the electrode group shown in
[0036] Figure 17 is Figure 16 The assembly schematic diagram of the connecting piece of the battery cell and the electrode group from another perspective shown in
[0037] Figure 18 is Figure 17 The top view schematic diagram of the connecting piece of the battery cell and the electrode group shown in
[0038] Figure 19 is Figure 18 The schematic diagram of the E-E cross-section of the connecting piece of the battery cell and the electrode group shown in
[0039] Reference numerals:
[0040] 100, battery cell; 1, housing; 11, accommodation cavity; 12, mounting hole; 2, electrode group; 21, tab; 3, terminal assembly; 31, terminal body; 311, first groove; 312, second groove; 313, through hole; 314, riveting portion; 32, upper plastic part; 33, welding block; 34, sealing ring; 4, connecting piece; 41, first segment; 42, second segment; 43, connecting section; 5, lower plastic part; 6, explosion-proof valve. Detailed description of the specific implementation
[0041] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0042] Next, refer to Figures 1 - 19 to describe the battery cell 100 according to the first aspect embodiment of the present invention.
[0043] As Figures 1 - 19 shown, the battery cell 100 according to the first aspect embodiment of the present invention includes: a housing 1, an electrode group 2, a terminal assembly 3, and a connecting piece 4.
[0044] Specifically, the housing 1 is formed with an accommodation cavity 11 and a mounting hole 12. The electrode group 2 is disposed in the accommodation cavity 11. The electrode group 2 has a tab 21. The terminal assembly 3 is disposed in the mounting hole 12. The connecting piece 4 includes a first welding portion and a second welding portion. The first welding portion is electrically connected to the tab 21. The second welding portion is bendably connected to the first welding portion. The second welding portion is electrically connected to the terminal assembly 3. Thus, the structure of the battery cell 100 is simple, and the structural compactness inside the battery cell 100 is improved.
[0045] According to the battery cell 100 of the embodiment of the present utility model, the tab 21 and the terminal post are connected through the connecting piece 4, which avoids the tearing of the tab 21, improves the overall packaging density and structural compactness of the battery cell 100, has high space utilization rate, enhances the space energy density of the battery cell 100, and has a clever structural design, reduces the assembly difficulty, and improves the assembly efficiency.
[0046] In some embodiments of the present utility model, such as Figure 4 shown, the terminal post assembly 3 includes: a terminal post body 31, an upper plastic part 32 and a welding block 33. The terminal post body 31 is formed with a through hole 313 and a first groove 311. The second welding part is adapted to pass through the through hole 313 and bend into the first groove 311. The upper plastic part 32 is sleeved on the terminal post body 31, and the welding block 33 is arranged in the first groove 311 and is welded to the second welding part. As shown in the figure, the connecting piece 4 is formed into an L shape. After the first welding part is welded to the electrode group 2, the second welding part passes through the through hole 313 and is bent and welded to the terminal post. Thereby, the tearing of the tab 21 is avoided, the production quality is improved, and the production difficulty is reduced.
[0047] In some embodiments of the present utility model, the terminal post assembly 3 further includes: a sealing ring 34. The sealing ring 34 is arranged in the accommodation cavity 11 and is located between the terminal post body 31 and the housing 1. Thereby, it prevents the electrolyte from leaking out from the position of the mounting hole 12, improves the safety performance of the battery cell 100, and can reduce the damage caused by vibration or external impact. The sealing ring 34 improves the dust and water protection effect.
[0048] In some embodiments of the present utility model, such as Figure 4 shown, the terminal post body 31 is further formed with a second groove 312. The first groove 311 and the second groove 312 are communicated through the through hole 313, and the tab 21 is located in the second groove 312. Thereby, the reliability of the welding is ensured, the operation steps are simplified, the space of the tab 21 is saved, the internal structural compactness of the battery cell 100 is improved, and the space utilization rate is increased.
[0049] In some embodiments of the present utility model, the bottom wall of the first groove 311 is formed as a welding surface, and the second welding part is welded to the welding surface. Thereby, welding between surfaces improves the welding quality, increases the welding connection surface, makes the heat distribution more uniform, and improves the product quality.
[0050] In some embodiments of the present utility model, such as Figure 4As shown, the pole column body 31 further forms a riveting portion 314. The riveting portion 314 is located within the accommodation cavity 11. The battery cell 100 further includes: a lower plastic part 5. The lower plastic part 5 is disposed within the accommodation cavity 11 and is located between the riveting portion 314 and the housing 1. Thus, the structure of the pole column body 31 is simple and the connection is firm, ensuring the structural reliability of the pole column assembly 3, preventing accidents, and enhancing the safety of the battery cell 100.
[0051] Furthermore, the welding portion is away from the lower plastic part 5 because the lower plastic part 5 has no risk of thermal melting, improving the reliability of the battery cell 100.
[0052] In some embodiments of the present invention, such as Figure 4 As shown, the connecting piece 4 includes a first segment 41, a connecting segment 43, and a second segment 42 that are connected in sequence. Both the first segment 41 and the second segment 42 extend along a first direction, the connecting segment 43 extends along a second direction, the connecting segment 43 is located within the through hole 313, the first welding portion is formed on the first segment 41, and the second welding portion is formed on the second segment 42. Thus, the structure of the connecting piece 4 is simple, the design is ingenious, it is convenient for production, and it can be flexibly assembled onto the battery cell 100, improving the production efficiency of the battery cell 100.
[0053] In some embodiments of the present invention, the battery cell 100 further includes: an explosion-proof valve 6. An explosion-proof hole is formed on the housing 1, and the explosion-proof valve 6 is disposed within the explosion-proof hole and is connected to the housing 1. Thus, the safety and reliability of the battery cell 100 are improved, and dangerous situations caused by a sudden increase in the internal pressure of the battery are avoided.
[0054] The battery pack according to the second aspect embodiment of the present invention includes the battery cell 100 according to the first aspect embodiment of the present invention above.
[0055] The battery pack according to the embodiment of the present invention, by providing the battery cell 100 of the first aspect embodiment above, thus improves the safety performance of the battery pack, improves the internal space utilization rate of the battery pack, enhances the volume energy density of the battery pack, and reduces the danger of the battery pack.
[0056] The power device according to the third aspect embodiment of the present invention includes the battery pack according to the second aspect embodiment of the present invention above.
[0057] The power device according to the embodiment of the present invention, by providing the battery pack of the second aspect embodiment above, thus improves the overall performance of the power device and enhances the safety performance of the power device.
[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.
[0059] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.
[0060] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0061] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0062] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.
Claims
1. A battery cell, characterized in that: include: A housing, wherein the housing is formed with a receiving cavity and a mounting hole; A pole group, the pole group is arranged in the accommodating cavity, and the pole group has a pole ear; A pole assembly, wherein the pole assembly is arranged in the mounting hole; A connecting piece, the connecting piece includes a first welding portion and a second welding portion, the first welding portion is electrically connected to the pole lug, the second welding portion is bendably connected to the first welding portion, and the second welding portion is electrically connected to the pole assembly.
2. The battery cell according to claim 1, characterized in that: The pole assembly comprises: A pole body, wherein the pole body is formed with a through hole and a first groove, and the second welding portion is suitable for passing through the through hole and bending in the first groove; An upper plastic part, the upper plastic part is sleeved on the pole body; A welding block is disposed in the first groove and is connected to the second welding portion by welding.
3. The battery cell according to claim 2, characterized in that: The pole assembly further includes a sealing ring, which is arranged in the accommodating cavity and located between the pole body and the shell.
4. The battery cell according to claim 3, characterized in that: The pole body is further formed with a second groove, the first groove is communicated with the second groove through the through hole, and the pole ear is located in the second groove.
5. The battery cell according to claim 4, characterized in that: The bottom wall of the first groove is formed as a welding surface, and the second welding portion is welded to the welding surface.
6. The battery cell according to any one of claims 2 to 5, characterized in that: The pole body is further formed with a riveted portion, which is located in the accommodating cavity. The battery cell further comprises: a lower plastic part, which is arranged in the accommodating cavity and between the riveted portion and the shell.
7. The battery cell according to any one of claims 2 to 5, characterized in that: The connecting piece includes a first segment, a connecting segment and a second segment connected in sequence, the first segment and the second segment both extend along a first direction, the connecting segment extends along a second direction, the connecting segment is located in the through hole, the first welding portion is formed on the first segment, and the second welding portion is formed on the second segment.
8. The battery cell according to any one of claims 1 to 5, characterized in that: Also includes: An explosion-proof valve, an explosion-proof hole is formed on the shell, and the explosion-proof valve is arranged in the explosion-proof hole and connected to the shell.
9. A battery pack, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 8.
10. A power device, characterized in that: A battery pack comprising the battery pack of claim 9.