Pole group and battery

Abstract

The utility model discloses a pole group and a battery. The pole group comprises a pole group body, and the tab group is arranged at one end of the pole group body along the first direction, and the height of the tab group in the first direction is 0.8-2.5 mm. According to the pole group disclosed by the utility model, the tab group is arranged at one end of the pole group body along the first direction, and the height of the tab group in the first direction is 0.8 mm-2. 5mm, so that the connection strength of the tab group can be ensured, the occupied space of the tab group can be reduced, the space utilization rate can be improved, and the current flowing path of the tab group can be shortened; the internal resistance of the tab group is reduced, so that the heating value of the battery is reduced, and the performance and safety of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a pole group and a battery. Background Art

[0002] In the related art, the tab group of the pole group occupies a large internal space, reducing the space utilization rate and increasing the production cost. At the same time, in a harsh environment such as vibration of the pole group, the tab group is prone to risks such as tearing, thus easily causing safety risks such as thermal runaway of the battery. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a pole group which can improve the space utilization rate while ensuring the connection strength of the tab group, and is convenient for reducing the heat generation of the battery and improving the performance and safety of the battery.

[0004] Another object of the utility model is to provide a battery having the above-mentioned pole group.

[0005] The pole group according to the embodiment of the utility model includes: a pole group body; a tab group provided at one end of the pole group body along a first direction, and the height of the tab group in the first direction is 0.8 mm - 2.5 mm.

[0006] The pole group according to the embodiment of the utility model, by providing the tab group at one end of the pole group body along the first direction and the height of the tab group in the first direction being 0.8 mm - 2.5 mm, can ensure the connection strength of the tab group while reducing the occupied space of the tab group, is beneficial to improving the space utilization rate, and can shorten the current flow path of the tab group, reduce the internal resistance of the tab group, is convenient for reducing the heat generation of the battery, and is beneficial to improving the performance and safety of the battery.

[0007] In addition, the pole group according to the above embodiment of the utility model may further have the following additional technical features:

[0008] The pole group according to some embodiments of the utility model, the pole group body includes: a plurality of pole pieces stacked on each other in a second direction, and a separator is provided between two adjacent pole pieces. One end of the pole piece along the first direction is provided with a tab, and a plurality of the tabs are bent and connected to each other in the second direction to form the tab group, and the first direction and the second direction are perpendicular.

[0009] According to some embodiments of the utility model, a plurality of the tabs are connected by a flattening process.

[0010] According to some embodiments of the present utility model, when the tab extends along the first direction, the height of the tab in the first direction is 0.8 mm - 4 mm.

[0011] According to some embodiments of the present utility model, the tab includes a plurality of tab blocks arranged at intervals along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0012] According to some embodiments of the present utility model, the tab group is a positive tab or a negative tab; or, there are a plurality of tab groups, and the plurality of tab groups include a positive tab and a negative tab, and the positive tab and the negative tab are arranged on opposite sides of the tab group body along the first direction.

[0013] According to some embodiments of the present utility model, the thickness of the tab group body in the second direction is 8 mm - 25 mm.

[0014] According to some embodiments of the present utility model, the tab group is a stacked tab group.

[0015] The battery according to an embodiment of the present utility model includes the tab group according to an embodiment of the present utility model.

[0016] For the battery according to an embodiment of the present utility model, by arranging the tab group at one end of the tab group body along the first direction, and the height of the tab group in the first direction is 0.8 mm - 2.5 mm, it is possible to reduce the occupied space of the tab group while ensuring the connection strength of the tab group, which is beneficial to improving the space utilization rate, and can shorten the current flow path of the tab group, reduce the internal resistance of the tab group, facilitate reducing the heat generation of the battery, and is beneficial to improving the performance and safety of the battery.

[0017] According to some embodiments of the present utility model, the battery is a square battery.

[0018] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0020] Figure 1 is a schematic structural diagram of a tab group according to an embodiment of the present utility model from one angle;

[0021] Figure 2 is a schematic structural diagram of the tab group according to an embodiment of the present utility model from another angle;

[0022] Figure 3is the front view of the electrode group according to an embodiment of the present utility model;

[0023] Figure 4 is the top view of the electrode group according to an embodiment of the present utility model;

[0024] Figure 5 is the left view of the electrode group according to an embodiment of the present utility model;

[0025] Figure 6 is the front view of the positive electrode plate of the electrode group according to an embodiment of the present utility model;

[0026] Figure 7 is the front view of the negative electrode plate of the electrode group according to an embodiment of the present utility model.

[0027] Reference numerals:

[0028] 100, electrode group;

[0029] 10, electrode group body; 11, electrode plate; 111, positive electrode plate; 112, negative electrode plate; 12, tab; 121, tab block;

[0030] 20, tab group; 21, positive tab; 22, negative tab. Detailed implementation manners

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein 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 only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationships 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. are based on the orientation or positional relationships shown in the drawings, and are 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 therefore should not be construed as a limitation of the present utility model.

[0033] In the description of the present utility model, the "first feature" and the "second feature" may include one or more of such features. The meaning of "a plurality" is two or more. The first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. The first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0034] The following describes the electrode group 100 according to an embodiment of the present utility model with reference to the accompanying drawings.

[0035] Refer to Figures 1 - 5 As shown, the electrode group 100 according to an embodiment of the present utility model may include: an electrode group body 10 and an electrode tab group 20.

[0036] Specifically, the electrode tab group 20 is provided at one end of the electrode group body 10 along the first direction. Through the electrode tab group 20, the connection between the electrode group body 10 and an external structure (such as a connecting piece or an electrode post, etc.) can be realized, meeting the connection requirements of the electrode group 100.

[0037] In addition, as Figure 3 shown, the height of the electrode tab group 20 in the first direction is 0.8 mm - 2.5 mm, that is, the height of the electrode tab group 20 in the first direction is H1 and satisfies 0.8 mm ≤ H1 ≤ 2.5 mm. Within the above size range, while ensuring the connection strength of the electrode tab group 20, the height of the electrode tab group 20 can be reduced, thereby reducing the occupied space of the electrode tab group 20, which is beneficial to improving the space utilization rate, reducing the production cost. At the same time, the current flowing path of the electrode tab group 20 can be shortened, the internal resistance of the electrode tab group 20 can be reduced, which is convenient for reducing the heat generation of the battery, improving the performance of the battery, and can avoid the risk of tearing easily occurring due to the relatively high height of the electrode tab group 20, which is beneficial to improving the safety performance of the battery. For example, in some specific embodiments, the height of the electrode tab group 20 in the first direction may be 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0038] For the electrode group 100 according to an embodiment of the present utility model, by providing the electrode tab group 20 at one end of the electrode group body 10 along the first direction and the height of the electrode tab group 20 in the first direction being 0.8 mm - 2.5 mm, while ensuring the connection strength of the electrode tab group 20, the occupied space of the electrode tab group 20 can be reduced, which is beneficial to improving the space utilization rate, and the current flowing path of the electrode tab group 20 can be shortened, the internal resistance of the electrode tab group 20 can be reduced, which is convenient for reducing the heat generation of the battery, and is beneficial to improving the performance and safety of the battery.

[0039] In some embodiments of the present utility model, as Figure 6 andFigure 7 As shown, the electrode group body 10 includes a plurality of (greater than or equal to two) electrode plates 11. The plurality of electrode plates 11 are stacked on top of each other in the second direction and can form an electrode group 100. A separator is provided between two adjacent electrode plates 11, so that the separator can isolate the electrode plates 11, prevent short - circuit phenomena, ensure the normal use of the electrode group 100. At the same time, the energy density of the electrode group 100 can be increased through the plurality of electrode plates 11, facilitating the storage of more electric energy.

[0040] In addition, as Figure 6 shown in Figure 7 As shown, an electrode tab 12 is provided at one end of the electrode plate 11 along the first direction. The plurality of electrode tabs 12 are bent along the second direction, and the plurality of electrode tabs 12 are connected to each other to form an electrode tab group 20. The first direction and the second direction are perpendicular, which can realize the connection of the plurality of electrode tabs 12, ensure reliable connection, and improve the structural strength.

[0041] In some embodiments, as Figure 6 shown in Figure 7 As shown, the plurality of electrode plates 11 include a positive electrode plate 111 and a negative electrode plate 112. The positive electrode plate 111 and the negative electrode plate 112 are stacked on top of each other in the second direction, so that the polarities of two adjacent electrode plates 11 are opposite, which can meet the required assembly requirements. And a separator is provided between the adjacent positive electrode plate 111 and negative electrode plate 112, which can ensure the normal use of the electrode group 100.

[0042] In the related art, the electrode tabs need to extend a long section. The electrode tabs of multiple electrode plates are connected together by welding (such as ultrasonic welding), and then connected to the external structure through bending and welding, which makes the occupied internal space large, the space utilization rate low, and the cost high. In addition, in a harsh environment such as when the electrode group is vibrated, the bent electrode tabs are prone to risks such as tearing, causing safety risks such as thermal runaway.

[0043] Therefore, in some embodiments of the present invention, the plurality of electrode tabs 12 are connected by a flattening process. Through the flattening process, the extended plurality of electrode tabs 12 can be flattened and compacted, ensuring reliable connection of the plurality of electrode tabs 12, meeting the length requirements of the electrode tab group 20, being beneficial to reducing the occupied space, and ensuring high structural strength of the electrode tab group 20, avoiding problems such as tearing.

[0044] According to some embodiments of the present invention, as Figure 6As shown, when the tab 12 extends in the first direction, the height of the tab 12 in the first direction is 0.8 mm - 4 mm, that is, when the tab 12 extends in the first direction, the height of the tab 12 in the first direction is H2 and satisfies 0.8 mm ≤ H2 ≤ 4 mm. Within the above size range, it is possible to ensure reliable connection of multiple tabs 12, ensure that the tab 12 has sufficient current-carrying capacity to meet the required connection requirements, and facilitate processing and production. For example, in some specific embodiments, when the tab 12 extends in the first direction, the height of the tab 12 in the first direction can be 0.8 mm, 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm, etc.

[0045] In some embodiments of the present invention, such as Figure 6 and Figure 7 As shown, the tab 12 includes a plurality of (greater than or equal to two) tab blocks 121, and the plurality of tab blocks 121 are arranged at intervals in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. By means of the plurality of tab blocks 121, it is convenient to bend the tab 12, making the bending of the tab 12 more convenient, and ensuring reliable connection of the plurality of tabs 12, avoiding problems such as poor contact, and ensuring the normal use of the electrode group 100.

[0046] In some embodiments, the tab 12 can be formed into a plurality of tab blocks 121 by die cutting, which is convenient for processing and manufacturing the tab 12 and is beneficial to improving production efficiency.

[0047] According to some embodiments of the present invention, the tab group 20 can be a positive tab 21 or a negative tab 22. While ensuring the structural strength, it is possible to reduce the occupied space of the positive tab 21 or the negative tab 22, which is beneficial to improving the space utilization rate, reducing the production cost. At the same time, it can shorten the current flow path of the positive tab 21 or the negative tab 22, reduce the internal resistance of the positive tab 21 or the negative tab 22, facilitate reducing the heat generation of the battery, improving the performance of the battery, and avoiding the risk of tearing due to the relatively high height of the positive tab 21 or the negative tab 22, which is beneficial to improving the safety performance of the battery.

[0048] Or, such as Figures 1 - 5As shown, there are multiple tab groups 20. The multiple tab groups 20 include positive tabs 21 and negative tabs 22. The positive tabs 21 and negative tabs 22 are arranged on opposite sides of the electrode group body 10 along the first direction, which can meet the connection requirements of the electrode group body 10 with external structures through the positive tabs 21 and negative tabs 22. While ensuring the structural strength of the positive tabs 21 and negative tabs 22, it can reduce the occupied space of the positive tabs 21 and negative tabs 22, which is beneficial to improving space utilization rate, reducing production costs. At the same time, it can shorten the current flow path of the positive tabs 21 and negative tabs 22, reduce the internal resistance of the positive tabs 21 and negative tabs 22, facilitate reducing the heat generation of the battery, improving the performance of the battery, and can avoid the risk of tearing easily occurring due to the relatively high height of the positive tabs 21 and negative tabs 22, which is beneficial to improving the safety performance of the battery.

[0049] In some embodiments, the positive tabs 21 and negative tabs 22 can be located on the same side of the electrode group body 10, which can improve space utilization rate and reduce manufacturing difficulty, being beneficial to improving production efficiency.

[0050] In some embodiments of the present utility model, as Figure 4 shown, the thickness of the electrode group body 10 in the second direction is 8 mm - 25 mm, that is, the thickness of the electrode group body 10 in the second direction is T and satisfies 8 mm ≤ T ≤ 25 mm. Within the above size range, the energy density, power density, and safety performance of the battery can be ensured, and the processing of the electrode group 100 is more reliable, and the processing difficulty can be reduced. For example, in some specific embodiments, the thickness of the electrode group body 10 in the second direction can be 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, etc.

[0051] According to some embodiments of the present utility model, the electrode group 100 is a stacked electrode group 100. The stacked electrode group 100 is convenient for improving the energy density of the battery, and is convenient for processing and manufacturing, has a high degree of automation, can reduce material waste, and is beneficial to reducing production costs.

[0052] In some embodiments, as Figure 2 shown, the height of the electrode group body 10 along the first direction is greater than or equal to 300 mm, that is, the height of the electrode group body 10 along the first direction is H3 and satisfies H3 ≥ 300 mm. Within the above size range, the energy density of the battery can be improved, meeting the usage requirements of the battery. And the height of the tab group 20 in the first direction is 0.8 mm - 2.5 mm. While ensuring the energy density of the battery, it can reduce the occupied space of the battery, which is beneficial to improving space utilization rate. For example, in some specific embodiments, the height of the electrode group body 10 along the first direction can be 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, etc.

[0053] The battery according to an embodiment of the present utility model includes the electrode assembly 100 according to an embodiment of the present utility model. Since the electrode assembly 100 according to an embodiment of the present utility model has the above beneficial technical effects, for the battery according to an embodiment of the present utility model, by arranging the tab group 20 at one end of the electrode assembly body 10 along the first direction, and the height of the tab group 20 in the first direction is 0.8 mm - 2.5 mm, it is possible to reduce the occupied space of the tab group 20 while ensuring the connection strength of the tab group 20, which is beneficial to improving the space utilization rate, and can shorten the current flow path of the tab group 20, reduce the internal resistance of the tab group 20, facilitate reducing the heat generation of the battery, and is beneficial to improving the performance and safety of the battery.

[0054] In some embodiments, the battery pack includes a housing and a cover plate. At least one side in the length direction of the housing is open to form an opening. The electrode assembly 100 is arranged in the housing, which is convenient for placing the electrode assembly 100, and the cover plate is covered on the opening, and the opening can be sealed through the cover plate to ensure reliable protection of the electrode assembly 100, thereby ensuring reliable sealing of the electrode assembly 100 and preventing the electrode assembly 100 from being exposed and damaged.

[0055] In some embodiments of the present utility model, the battery is a square battery, which is beneficial to realizing standardized production, improving production efficiency, reducing manufacturing costs, and the square battery is easy to be integrated with other devices, which is beneficial to improving the overall performance and reliability.

[0056] The other components and operations of the electrode assembly 100 according to an embodiment of the present utility model and the battery are known to those of ordinary skill in the art and will not be described in detail here.

[0057] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 situations.

[0058] In the description of this specification, the descriptions referring to terms such as "embodiment", "specific embodiment", "example", etc. mean 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 representations 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.

[0059] Although 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. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A pole group, characterized in that: include: Ji group ontology; A tab group, wherein the tab group is arranged at one end of the tab group body along a first direction, and a height of the tab group in the first direction is 0.8 mm-2.5 mm.

2. The pole group according to claim 1, characterized in that: The pole group body comprises: A plurality of pole pieces are stacked on each other in the second direction, and a diaphragm is provided between two adjacent pole pieces. A pole ear is provided at one end of the pole piece along the first direction, and the plurality of pole ears are bent along the second direction and connected to each other to form the pole ear group, and the first direction is perpendicular to the second direction.

3. The pole group according to claim 2, characterized in that: The plurality of tabs are connected by a flattening process.

4. The pole group according to claim 2, characterized in that: When the pole tab extends along the first direction, the height of the pole tab in the first direction is 0.8 mm-4 mm.

5. The pole group according to claim 2, characterized in that: The pole lug includes a plurality of pole blocks spaced apart along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The pole group according to claim 1, characterized in that: The tab group is a positive tab or a negative tab; Alternatively, there are multiple electrode tab groups, and the multiple electrode tab groups include positive electrode tabs and negative electrode tabs, and the positive electrode tabs and the negative electrode tabs are arranged on two opposite sides of the electrode group body along the first direction.

7. The pole group according to claim 1, characterized in that: The thickness of the pole group body in the second direction is 8mm-25mm.

8. The pole group according to claim 1, characterized in that: The pole group is a stacked pole group.

9. A battery, characterized in that: Comprising a pole group according to any one of claims 1-8.

10. The battery according to claim 9, characterized in that The battery is a square battery.

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