Battery monomer and battery

Abstract

The single battery comprises a pole group, the pole group comprises a first pole group and a second pole group which are arranged along a first direction, and the two ends of the first pole group along the first direction are respectively provided with a first positive pole lug and a first negative pole lug; the two ends of the second pole group along the first direction are respectively provided with a second positive pole lug and a second negative pole lug, the first negative pole lug and the second positive pole lug are overlapped and fixed along the second direction, and the first direction is perpendicular to the second direction. According to the battery monomer disclosed by the embodiment of the utility model, the pole group comprises the first pole group and the second pole group which are arranged along the first direction, and the first negative pole lug of the first pole group is electrically connected with the second positive pole lug of the second pole group, so that the lengths of the first negative pole lug and the second positive pole lug are reduced, and the internal space occupied by the pole group is further reduced; and the lengths of the first pole group and the second pole group can be shortened on the basis of ensuring the lengths of the pole groups, so that the structural strength of the pole groups is improved, and the yield of the battery monomers can be further improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety. In related technologies, lithium-ion battery cells are generally short, and the overall capacity improvement is limited by process conditions. Conversely, for very long cells, insufficient strength often results in bending and deformation, leading to a decrease in lithium-ion battery yield. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery cell that, while maintaining the length of the electrode assembly, shortens the lengths of the first and second electrode assemblies, thereby improving the structural strength of the electrode assembly and consequently increasing the yield rate of the battery cell.

[0004] This utility model also proposes a battery having the above-mentioned battery cells.

[0005] A battery cell according to a first aspect of the present invention includes: an electrode group, the electrode group including a first electrode group and a second electrode group arranged along a first direction, the first electrode group having a first positive electrode tab and a first negative electrode tab at both ends along the first direction; the second electrode group having a second positive electrode tab and a second negative electrode tab at both ends along the first direction, the first negative electrode tab and the second positive electrode tab being stacked and fixed along a second direction, wherein the first direction is perpendicular to the second direction.

[0006] According to the battery cell of this utility model embodiment, the electrode assembly includes a first electrode assembly and a second electrode assembly arranged along a first direction, and the first negative electrode tab of the first electrode assembly is electrically connected to the second positive electrode tab of the second electrode assembly. This can reduce the length of the first negative electrode tab and the second positive electrode tab, thereby reducing the internal space occupied by the electrode assembly. Furthermore, while ensuring the length of the electrode assembly, the lengths of the first electrode assembly and the second electrode assembly can be shortened, which can improve the structural strength of the electrode assembly and thus improve the yield of the battery cell.

[0007] According to some embodiments of the present invention, the battery cell further includes two supporting side plates, which are respectively located on both sides of the electrode group along a third direction and are fixedly connected to the electrode group, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0008] According to some embodiments of the present invention, each of the supporting side plates is provided with an extension bracket on the side facing the pole group, and two extension brackets are located between the first pole group and the second pole group. Each extension bracket has a receiving cavity with an opening facing the other extension bracket. The receiving cavity extends through the extension bracket along the first direction, and the first negative electrode tab and the second positive electrode tab are located in the receiving cavity.

[0009] According to some embodiments of the present invention, the extension bracket is coplanar with the pole group.

[0010] According to some embodiments of the present invention, the dimension of the electrode assembly along the third direction is C, and the dimension of the extension bracket along the third direction is H, satisfying: 10mm≤H≤C / 2≤100mm.

[0011] According to some embodiments of the present invention, the dimension of the extension bracket along the first direction is W, which satisfies: 6mm≤W≤15mm.

[0012] According to some embodiments of the present invention, the support side plate is provided with a plurality of notches on both sides along the second direction.

[0013] According to some embodiments of the present invention, the battery cell further includes: a housing and an insulating film, the insulating film covering the outer periphery of the electrode assembly, and the supporting side plate located between the insulating film and the electrode assembly, the housing having an explosion-proof valve on one side along the third direction, and the insulating film having a slit opposite to the explosion-proof valve.

[0014] According to some embodiments of the present invention, the battery cell further includes: a supporting end plate; a positive electrode cover plate and a negative electrode cover plate are respectively provided on both sides of the electrode group along the first direction; the supporting end plate is located between the negative electrode cover plate and the electrode group; the supporting end plate has a relief groove to avoid the second negative electrode tab; and the positive electrode cover plate is an integrally formed part.

[0015] The battery according to a second aspect of the present invention includes: a battery cell according to the first aspect of the present invention described above.

[0016] According to the battery embodiment of this utility model, by setting the above-mentioned battery cell...

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is an exploded view of a battery cell according to some embodiments of the present invention;

[0020] Figure 2 This is a partial schematic diagram of a battery cell according to some embodiments of the present invention;

[0021] Figure 3 This is a schematic diagram of the support side plate and extension bracket according to some embodiments of the present utility model;

[0022] Figure 4 yes Figure 3 Side view of the supporting side plate and extension bracket;

[0023] Figure 5 yes Figure 3 A side view of the supporting side plate and extension bracket from another direction;

[0024] Figure 6 This is a schematic diagram of an insulating film according to some embodiments of the present invention.

[0025] Figure label:

[0026] 100. Battery cell;

[0027] 1. Pole group; 11. First pole group; 111. First negative electrode tab; 12. Second pole group;

[0028] 2. Supporting side plate; 21. Notch; 3. Extension bracket; 31. Receiving cavity;

[0029] 4. Shell; 41. Explosion-proof valve; 5. Insulating membrane; 51. Slit; 6. Support end plate; 61. Clearance groove; 71. Positive electrode cover plate; 72. Negative electrode cover plate. Detailed Implementation

[0030] The following describes embodiments of the present invention in detail. 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 only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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 invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] The following is for reference. Figures 1-6 Description of a battery cell 100 according to an embodiment of the present utility model.

[0034] According to a first aspect embodiment of the present invention, a battery cell 100 includes an electrode assembly 1, the electrode assembly 1 including electrodes along a first direction (e.g., see attached diagram). Figure 1 The first electrode group 11 and the second electrode group 12 are arranged in the e1 direction. The first direction can be horizontal, and the first electrode group 11 and the second electrode group 12 are arranged in the horizontal direction. The first electrode group 11 has a first positive electrode tab and a first negative electrode tab 111 at its two ends along the first direction, respectively; the second electrode group 12 has a second positive electrode tab and a second negative electrode tab at its two ends along the first direction, respectively. The first negative electrode tab 111 and the second positive electrode tab are arranged in the second direction (for example, refer to the attached diagram). Figure 1 The first electrode tab 111 and the second electrode tab 111 are stacked and fixed in the e2 direction, wherein the first direction is perpendicular to the second direction. For example, the first negative electrode tab 111 and the second positive electrode tab 111 can be fixed by welding.

[0035] The electrode assembly 1 is designed as a separate unit, comprising a first electrode assembly 11 and a second electrode assembly 12 arranged along a first direction. The first negative electrode tab 111 of the first electrode assembly 11 is electrically connected to the second positive electrode tab of the second electrode assembly 12. This allows for electrical connection between the first electrode assembly 11 and the second electrode assembly 12, shortening the length of the first electrode assembly 11 and the second electrode assembly 12 while maintaining the overall length of the electrode assembly 1. This reduces defects such as wrinkles, deformation, delamination, and breakage caused by an excessively long electrode assembly 1, improving the structural strength of the electrode assembly 1 and consequently increasing the yield of the battery cell 100. Simultaneously, the first negative electrode tab 111 and the second positive electrode tab are stacked and fixed along a second direction, reducing their length and thus the internal space occupied by the electrode assembly 1. This also simplifies the connection process between the first negative electrode tab 111 and the second positive electrode tab and reduces internal resistance.

[0036] According to the battery cell 100 of this utility model embodiment, the electrode group 1 includes a first electrode group 11 and a second electrode group 12 arranged along a first direction, and the first negative electrode tab 111 of the first electrode group 11 is electrically connected to the second positive electrode tab of the second electrode group 12. Reducing the length of the first negative electrode tab 111 and the second positive electrode tab can reduce the internal space occupied by the electrode group 1. Furthermore, while ensuring the length of the electrode group 1, the length of the first electrode group 11 and the second electrode group 12 can be shortened, which can improve the structural strength of the electrode group 1 and thus improve the yield of the battery cell 100.

[0037] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The battery cell 100 also includes two supporting side plates 2, which are located along a third direction of the electrode group 1 (for example, refer to the attached diagram). Figure 1 The first pole group 11 and the second pole group 12 are fixedly connected to each other on both sides of the third direction (e3 direction), and the first direction, the second direction and the third direction are perpendicular to each other. The two supporting side plates 2 are used to fix the first pole group 11 and the second pole group 12 on both sides along the third direction, so as to fix the first pole group 11 and the second pole group 12 and facilitate the fixed installation of the pole group 1.

[0038] For example, the two support side plates 2 can be glued to the third-direction sides of the first pole group 11 and the second pole group 12 using insulating adhesive.

[0039] According to some embodiments of the present invention, referring to Figure 1-Figure 5 Each support side plate 2 is provided with an extension bracket 3 on the side facing the pole group 1. The two extension brackets 3 are located between the first pole group 11 and the second pole group 12. That is, in the first direction, the two extension brackets 3 are located between the first pole group 11 and the second pole group 12. The two extension brackets 3 can abut against each other or be spaced apart in the second direction.

[0040] Each extension bracket 3 has a receiving cavity 31 with an opening facing another extension bracket 3. The receiving cavity 31 extends through the extension bracket 3 in a first direction, so that the first negative electrode tab 111 and the second positive electrode tab can be inserted into the receiving cavity 31. The first negative electrode tab 111 and the second positive electrode tab are welded and fixed in the receiving cavity 31. The extension bracket 3 can protect the first negative electrode tab 111 and the second positive electrode tab.

[0041] For example, the end of each extension bracket 3 facing the receiving cavity 31 of another extension bracket 3 is rounded to avoid stress concentration and to prevent the end of the extension bracket 3 from scratching the tab.

[0042] For example, the supporting side plate 2 and the extension bracket 3 are integrally molded plastic parts, and the supporting side plate 2 and the extension bracket 3 can be manufactured by injection molding.

[0043] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The extension bracket 3 is coplanar with the pole group 1, which allows the extension bracket 3 to not occupy additional internal space of the housing 4, and can also be well supported between the first pole group 11 and the second pole group 12.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The dimension of electrode assembly 1 along the third direction is C, and the dimension of extension bracket 3 along the third direction is H, satisfying: 10mm≤H≤C / 2≤100mm. The dimension of extension bracket 3 along the third direction can be half the dimension of electrode assembly 1 along the third direction, meaning the two extension brackets 3 are in contact with each other in the third direction; or the dimension of extension bracket 3 along the third direction can be less than half the dimension of electrode assembly 1 along the third direction, meaning the two extension brackets 3 are spaced apart in the third direction.

[0045] For example, the dimensions of the extension bracket 3 along the third direction can be 10mm, 20mm, 50mm, 70mm or 100mm, etc.; the dimensions of the pole group 1 along the third direction can be 20mm, 40mm, 100mm, 150mm or 200mm, etc.

[0046] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The dimension of the extension bracket 3 along the first direction is W, which satisfies: 6mm≤W≤15mm. Within this range, the extension bracket 3 can be well supported between the first pole group 11 and the second pole group 12, which can increase the stability of the first pole group 11 and the second pole group 12. At the same time, it can also allow the first negative electrode tab 111 and the second positive electrode tab to be accommodated in the receiving cavity 31 of the extension bracket 3.

[0047] For example, the dimension of the extension bracket 3 along the first direction can be 6mm, 8mm, 10mm, 12mm or 15mm, etc.

[0048] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The support side plate 2 has multiple notches 21 on both sides along the second direction. When the battery cell 100 experiences thermal runaway, the high-temperature gas in the first electrode group 11 and the second electrode group 12 can be discharged from the first electrode group 11 and the second electrode group 12 through the multiple notches 21.

[0049] According to some embodiments of the present invention, referring to Figures 1-6 The battery cell 100 also includes a housing 4 and an insulating film 5. The insulating film 5 covers the outer periphery of the electrode assembly 1, and the supporting side plate 2 is located between the insulating film 5 and the electrode assembly 1. The insulating film 5 improves the insulation protection capability of the electrode assembly 1 and prevents the electrode assembly 1 from contacting the housing 4, thus avoiding a short circuit in the battery cell 100. For example, the thickness of the insulating film 5 is T, which satisfies the condition: 0.1mm ≤ T ≤ 0.3mm. Within this range, the thickness of the insulating film 5 can be avoided from being too thin, thus failing to insulate the housing 4 and the electrode assembly 1, and it can also be avoided from being too thick, thus occupying too much internal space of the housing 4. The thickness of the insulating film 5 can be 0.1mm, 0.15mm, 0.2mm, or 0.3mm, etc.

[0050] An explosion-proof valve 41 is provided on one side of the housing 4 along a third direction. The insulating membrane 5 has a slit 51 opposite to the explosion-proof valve 41. When the battery cell 100 experiences thermal runaway, the high-temperature gas from the first electrode group 11 and the second electrode group 12 is collected at the location of the explosion-proof valve 41 through the slit 51 and then discharged through the explosion-proof valve 41. This can save the flow path of the high-temperature gas, thereby saving the time for the high-temperature gas to be discharged and improving the safety of the battery cell 100.

[0051] For example, two explosion-proof valves 41 can be provided and located at 1 / 4 of the length of the housing 4, which can further increase the safety of the battery cell 100.

[0052] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The battery cell 100 also includes a support end plate 6. The electrode assembly 1 has a positive electrode cover plate 71 and a negative electrode cover plate 72 on both sides along the first direction. The support end plate 6 is located between the negative electrode cover plate 72 and the electrode assembly 1. The support end plate 6 has a clearance groove 61 to avoid a second negative electrode tab, which passes through the clearance groove 61 and connects to the negative electrode cover plate 72. When the electrode assembly 1 is inserted into the casing, the support end plate 6 can be pushed to push the electrode assembly 1 into the casing, ensuring force balance during insertion and facilitating insertion. For example, the support end plate 6 and the electrode assembly 1 can be fixedly connected by adhesive, heat fusion, or other methods.

[0053] The positive electrode cover 71 is a one-piece molded part. The positive electrode cover 71 can be a plain aluminum plate. Eliminating other parts on the positive electrode cover 71 can improve the space utilization rate of the housing 4. For example, an insulating sticker is provided on the side of the positive electrode cover 71 near the housing 4 to prevent short circuits in the battery cell 100.

[0054] The battery according to a second aspect of the present invention includes: a battery cell 100 according to the first aspect of the present invention described above.

[0055] According to the battery of the present utility model embodiment, by setting the above-mentioned battery cell 100, the length of the first negative electrode tab 111 and the second positive electrode tab is reduced, thereby reducing the internal space occupied by the electrode group 1; and while ensuring the length of the electrode group 1, the length of the first electrode group 11 and the second electrode group 12 can be shortened, thereby improving the structural strength of the electrode group 1 and thus improving the yield of the battery cell 100.

[0056] Throughout this specification, references to terms such as "some embodiments," "optionally," "further," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] 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 purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: The electrode group includes a first electrode group and a second electrode group arranged along a first direction. The first electrode group has a first positive electrode tab and a first negative electrode tab at both ends along the first direction. The second electrode group has a second positive electrode tab and a second negative electrode tab at both ends along the first direction. The first negative electrode tab and the second positive electrode tab are stacked and fixed along a second direction, wherein the first direction is perpendicular to the second direction.

2. The battery cell according to claim 1, characterized in that, Also includes: Two supporting side plates are located on both sides of the pole group along a third direction and are fixedly connected to the pole group. The first direction, the second direction, and the third direction are perpendicular to each other.

3. The battery cell according to claim 2, characterized in that, Each of the supporting side plates is provided with an extension bracket on the side facing the pole group. Two extension brackets are located between the first pole group and the second pole group. Each extension bracket has a receiving cavity with an opening facing the other extension bracket. The receiving cavity extends through the extension bracket along the first direction. The first negative electrode tab and the second positive electrode tab are located in the receiving cavity.

4. The battery cell according to claim 3, characterized in that, The extension bracket is coplanar with the electrode assembly.

5. The battery cell according to claim 3, characterized in that, The dimension of the electrode assembly along the third direction is C, and the dimension of the extension bracket along the third direction is H, satisfying: 10mm≤H≤C / 2≤100mm.

6. The battery cell according to claim 3, characterized in that, The dimension of the extension bracket along the first direction is W, which satisfies: 6mm≤W≤15mm.

7. The battery cell according to claim 2, characterized in that, The support side plate has multiple notches on both sides along the second direction.

8. The battery cell according to claim 2, characterized in that, Also includes: The housing and the insulating film, the insulating film covering the outer periphery of the electrode assembly, and the supporting side plate located between the insulating film and the electrode assembly, the housing having an explosion-proof valve on one side along the third direction, and the insulating film having a slit opposite to the explosion-proof valve.

9. The battery cell according to claim 8, characterized in that, Also includes: The supporting end plate has a positive electrode cover plate and a negative electrode cover plate respectively on both sides of the electrode group along the first direction. The supporting end plate is located between the negative electrode cover plate and the electrode group. The supporting end plate has a relief groove to avoid the second negative electrode tab. The positive electrode cover plate is an integrally formed part.

10. A battery, characterized in that, include: The battery cell according to any one of claims 1-9.

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