Pole assembly, battery cell and battery pack

Abstract

The utility model discloses a pole assembly, a battery monomer and a battery pack. The pole assembly comprises a pole body, a plurality of pole pieces and a plurality of pole pieces, the upper plastic part is arranged on the pole column body in a sleeving manner; and the welding ring is arranged on the pole body in a sleeving manner and is positioned between the upper plastic part and the pole body, and a bendable flange is formed on the welding ring. According to the pole assembly disclosed by the utility model, by arranging the welding ring with the bendable turnup edge, the welding area is increased, the welding stability and conductivity are improved, the connection part is still reliable and is not easy to fall off when the battery is subjected to severe working conditions such as vibration, impact and the like, and the pole assembly is compact in structure and low in cost. The density of battery stacking is improved, the volume energy density of the battery is improved, the overall performance of the battery is effectively improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a pole assembly, a battery cell and a battery pack. Background Art

[0002] Related technologies point out that low battery volume energy density is one of the key factors limiting the endurance of many portable electronic devices and electric vehicles. Low energy density means less energy can be stored and provided in a given volume, so a larger battery volume is required to meet the same energy demand.

[0003] Traditional battery structures often contain more gaps and non-optimized stacking methods. By optimizing the internal structure design of the battery, such as adopting a denser electrode stacking method and developing a three-dimensional electrode structure, the loading amount of active materials can be increased and the energy density can be improved without increasing the battery volume. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a pole assembly, which has a compact structure and can improve the density of battery stacking.

[0005] The utility model also provides a battery monomer having the above-mentioned pole assembly.

[0006] The utility model also provides a battery pack having the battery monomer.

[0007] According to the first aspect of the utility model, the pole assembly comprises: a pole body; an upper plastic part, which is sleeved on the pole body; a welding ring, which is sleeved on the pole body and located between the upper plastic part and the pole body, and the welding ring is formed with a bendable flange.

[0008] According to the pole assembly of the utility model, by providing a welding ring with a bendable flange, the welding area is increased, the welding stability and conductivity are improved, and it is ensured that when the battery is subjected to harsh working conditions such as vibration and impact, the connection is still reliable and will not fall off easily. In addition, the structure of the pole assembly is compact, the density of battery stacking is improved, the volume energy density of the battery is improved, the overall performance of the battery is effectively improved, and the service life of the battery is extended.

[0009] In some embodiments, the pole assembly further includes: a sealing ring, which is sleeved on the pole body and located between the welding ring and the pole body.

[0010] In some embodiments, the pole body is formed with a flange, and a first groove and a second groove are defined on the periphery of the two side surfaces of the flange, the upper plastic part is located in the first groove, and the sealing ring is located in the second groove.

[0011] The battery cell according to the second aspect of the utility model comprises: a shell, the shell forming a accommodating cavity; a pole group, the pole group is arranged in the accommodating cavity, the pole group has a pole ear; an insulating film, the insulating film wraps the pole group; according to the first aspect of the utility model, the pole column assembly is arranged on the shell, and the pole column assembly is connected to the pole ear and electrically connected.

[0012] According to the battery cell of the present invention, by setting the pole assembly of the first aspect of the present invention, the overall structural compactness of the battery cell is improved, the density of battery cell stacking is improved, the volume energy density of the battery cell is improved, the overall performance of the battery cell is effectively improved, and the service life of the battery cell is extended.

[0013] In some embodiments, the battery cell further includes: a lower plastic part, the lower plastic part is disposed in the accommodating cavity, and the lower plastic part is thermally melt-connected to at least one of the shell and the insulating film.

[0014] In some embodiments, the battery cell further includes: a connecting piece, which is disposed between the pole lug and the pole column assembly and is electrically connected to both the pole lug and the pole column assembly.

[0015] In some embodiments, a mounting hole is formed on the shell, and the battery cell further includes: an explosion-proof valve, which is disposed in the mounting hole and is welded to the shell.

[0016] In some embodiments, the battery cell further includes: a bottom support plate, the bottom support plate is heat-meltedly connected to the insulating film; a cover plate, the cover plate seals the open opening of the shell, and the cover plate is welded to the shell.

[0017] In some embodiments, a liquid injection hole is formed on the shell, and a sealing member is disposed in the liquid injection hole.

[0018] A battery pack according to a third aspect of the present invention comprises a plurality of battery cells according to the second aspect of the present invention.

[0019] According to the battery pack of the utility model, by providing the battery cells of the second aspect, the internal space utilization of the battery pack is improved, the volume energy density of the battery pack is increased, the cost of the battery pack is reduced, the weight of the battery pack is reduced, and thus the overall performance of the battery pack is improved.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a pole assembly according to an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 An exploded schematic diagram of a pole assembly shown in ;

[0023] Figure 3 yes Figure 1 A schematic front view of the pole assembly shown in FIG.

[0024] Figure 4 yes Figure 3 AA cross-sectional schematic diagram of the pole assembly shown in;

[0025] Figure 5 yes Figure 4 A schematic diagram of a pole assembly shown in , wherein the flange is bent;

[0026] Figure 6 is a schematic diagram of a pole assembly of another embodiment;

[0027] Figure 7 yes Figure 6 AA cross-sectional schematic diagram of the pole assembly shown in;

[0028] Figure 8 is an exploded schematic diagram of a battery cell according to an embodiment of the utility model;

[0029] Fig. 9 yes Figure 8 The assembly diagram of the lower plastic part and the housing shown in FIG.

[0030] Fig.10 yes Figure 8 Schematic diagram of the assembly of the housing, pole assembly and explosion-proof valve shown in ;

[0031] Fig.11 yes Figure 8 A schematic top view of a battery cell shown in ;

[0032] Fig.12 yes Fig.11 BB cross-sectional schematic diagram of the battery cell shown in FIG.

[0033] Reference numerals:

[0034] 100. Battery cell; 1. Pole assembly; 11. Pole body; 111. Flange; 12. Upper plastic part; 13. Welding ring; 131. Flanging; 14. Sealing ring; 2. Shell; 21. Mounting hole; 22. Filling hole; 3. Pole group; 31. Pole ear; 4. Insulating film; 5. Lower plastic part; 6. Connecting piece; 7. Explosion-proof valve; 8. Bottom support plate; 91. Sealing aluminum nail; 92. Sealing rubber nail; 10. Cover plate. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] Reference below Figure 1-Figure 7 A pole assembly 1 according to an embodiment of a first aspect of the utility model is described.

[0037] like Figure 1-Figure 5 As shown, the pole assembly 1 according to the embodiment of the first aspect of the utility model comprises: a pole body 11 , an upper plastic part 12 and a welding ring 13 .

[0038] Specifically, the upper plastic part 12 is sleeved on the pole body 11, the welding ring 13 is sleeved on the pole body 11 and is located between the upper plastic part 12 and the pole body 11, and the welding ring 13 is formed with a bendable flange 131. Therefore, the pole assembly 1 has a simple structure and an ingenious design.

[0039] According to the pole assembly 1 of the embodiment of the utility model, by providing a welding ring 13 with a bendable flange 131, the welding area is increased, the stability and conductivity of the welding are improved, and it is ensured that when the battery is subjected to harsh working conditions such as vibration and impact, the connection is still reliable and will not fall off easily. In addition, the pole assembly 1 has a compact structure, which increases the density of battery stacking, improves the volume energy density of the battery, effectively improves the overall performance of the battery, and extends the service life of the battery.

[0040] In some embodiments of the present invention, the pole assembly 1 further includes: a sealing ring 14, which is sleeved on the pole body 11 and located between the welding ring 13 and the pole body 11. Therefore, the provision of the sealing ring 14 avoids electrolyte leakage, prevents electrochemical corrosion or electrical breakdown, protects the pole body 11 from the electrolyte, ensures the insulation of the electrode and the external connection, and improves the safety performance of the battery.

[0041] In some embodiments of the present invention, the pole body 11 is formed with a flange 111, and the periphery of the two side surfaces of the flange 111 defines a first groove and a second groove, the upper plastic part 12 is located in the first groove, and the sealing ring 14 is located in the second groove. Thus, the coordination between the components is optimized, the assembly efficiency is improved, and the sealing and overall durability of the battery are enhanced.

[0042] In some embodiments, the pole body 11 may be circular, square, rectangular, oval, etc. Figure 6 and Figure 7 As shown, the pole body 11 is square.

[0043] The battery cell 100 according to the second embodiment of the utility model includes the pole assembly 1 according to the first embodiment of the utility model.

[0044] Specifically, the battery cell 100 includes: a housing 2, a pole group 3, an insulating film 4 and a pole assembly 1, the housing 2 is formed with a receiving cavity, the pole group 3 is arranged in the receiving cavity, the pole group 3 has a pole ear 31, the insulating film 4 wraps the pole group 3, the pole assembly 1 is arranged on the housing 2, and the pole assembly 1 is connected and electrically connected to the pole ear 31. Therefore, the battery cell 100 has a simple structure and an ingenious design.

[0045] According to the battery cell 100 of the embodiment of the utility model, by setting the pole assembly 1 of the embodiment of the first aspect of the utility model, the overall structural compactness of the battery cell 100 is improved, the density of the stacking of the battery cell 100 is improved, the volume energy density of the battery cell 100 is improved, the overall performance of the battery cell 100 is effectively improved, and the service life of the battery cell 100 is extended.

[0046] In some embodiments of the present invention, Figure 8 As shown, the battery cell 100 further includes: a lower plastic part 5, which is disposed in the accommodating cavity and is thermally melt-connected to at least one of the housing 2 and the insulating film 4. Thus, the lower plastic part 5 is provided to prevent the electrode from contacting the housing 2 and causing a short circuit, and to maintain the stability of the internal structure of the battery, thereby enhancing the environmental adaptability and long-term usability of the battery.

[0047] In some embodiments of the present invention, Figure 8 As shown, the battery cell 100 also includes: a connecting plate 6, which is arranged between the pole ear 31 and the pole column assembly 1, and is electrically connected to the pole ear 31 and the pole column assembly 1. The function of the connecting plate 6 is to gather the pole ear 31 (positive or negative) of each battery cell in the pole group 3 to the pole column assembly 1, realize the collection and external output of electric energy, and ensure stable and reliable electrical contact between the pole column assembly 1 and the pole ear 31.

[0048] In other embodiments, the connecting sheet 6 may not be used, and the pole lug 31 is electrically connected to the pole assembly 1 .

[0049] In some embodiments of the present invention, Figure 8 As shown, a mounting hole 21 is formed on the housing 2, and the battery cell 100 further includes an explosion-proof valve 7, which is disposed in the mounting hole 21 and welded to the housing 2. Thus, the internal structure of the battery cell 100 is simplified, and the volume energy density of the battery cell 100 is improved.

[0050] In some embodiments of the present invention, Figure 8 As shown, the battery cell 100 further includes: a bottom support plate 8, which is connected to the insulating film 4 by heat melting; and a cover plate 10, which is sealed on the open opening of the shell 2 and is welded to the shell 2. Therefore, the battery cell 100 has a simple structure, is easy to produce, and has reduced production difficulty.

[0051] In some embodiments of the present invention, a liquid injection hole 22 is formed on the housing 2, and a sealing member is provided in the liquid injection hole 22. Preferably, the sealing member can be a sealing aluminum nail 91 and a sealing glue nail 92.

[0052] The following will refer to Figure 8-Figure 12 Describe the assembly steps of the battery cell 100 according to the embodiment of the utility model:

[0053] Wrap the insulating film 4 outside the pole group 3 (if there is a bottom support plate 8, first heat-melt the insulating film 4 and the bottom support plate 8), then heat-melt the insulating film 4 and the lower plastic part 5 (if there is a lower plastic part 5, skip this step if there is no lower plastic part 5), weld the pole ear 31 and the connecting piece 6 (if there is no connecting piece 6, skip this step), install the pole group 3 into the shell 2, weld the pole ear 31 and the pole column assembly 1, then weld the cover plate 10 to the shell 2, and weld the pole column assembly 1 to the shell 2 (the order of the welding steps after the pole group 3 is installed into the shell 2 is not limited to this).

[0054] The battery pack according to the embodiment of the third aspect of the utility model comprises a plurality of battery cells 100 according to the embodiment of the second aspect of the utility model.

[0055] According to the battery pack of the embodiment of the utility model, by providing the battery cell 100 of the above-mentioned second aspect embodiment, the internal space utilization of the battery pack is improved, the volume energy density of the battery pack is increased, the cost of the battery pack is reduced, the weight of the battery pack is reduced, and thus the overall performance of the battery pack is improved.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole assembly, characterized in that: include: pole body; An upper plastic part, the upper plastic part is sleeved on the pole body; A welding ring is sleeved on the pole body and located between the upper plastic part and the pole body, and the welding ring is formed with a bendable flange.

2. The pole assembly according to claim 1, characterized in that: Also includes: A sealing ring is sleeved on the pole body and located between the welding ring and the pole body.

3. The pole assembly according to claim 2, characterized in that: The pole body is formed with a flange, and the periphery of the two side surfaces of the flange defines a first groove and a second groove, the upper plastic part is located in the first groove, and the sealing ring is located in the second groove.

4. A battery cell, characterized in that: include: A housing, wherein the housing is formed with a receiving cavity; A pole group, the pole group is arranged in the accommodating cavity, and the pole group has a pole ear; an insulating film, wherein the insulating film wraps the electrode group; The pole assembly according to any one of claims 1 to 3, wherein the pole assembly is arranged on the shell, and the pole assembly is connected and electrically connected to the pole lug.

5. The battery cell according to claim 4, characterized in that: Also includes: A lower plastic part is arranged in the accommodating cavity and is hot-melt connected to at least one of the shell and the insulating film.

6. The battery cell according to claim 5, characterized in that: Also includes: A connecting piece is disposed between the pole lug and the pole column assembly and is electrically connected to both the pole lug and the pole column assembly.

7. The battery cell according to claim 6, characterized in that: The shell is formed with a mounting hole, and the battery cell further comprises an explosion-proof valve, which is arranged in the mounting hole and is welded to the shell.

8. The battery cell according to claim 5, characterized in that: Also includes: A bottom support plate, the bottom support plate is connected to the insulating film by thermal melting; A cover plate is used to cover the open opening of the shell, and the cover plate is welded to the shell.

9. The battery cell according to any one of claims 4 to 8, characterized in that: A liquid injection hole is formed on the shell, and a sealing member is arranged in the liquid injection hole.

10. A battery pack, characterized in that: A battery cell comprising the battery cell according to any one of claims 4 to 9.

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