Pole group and battery

Abstract

The utility model discloses a pole group and a battery. The pole group is a winding type pole group and 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 pole group is the winding type pole group, the pole lug group is arranged at one end of the pole group body along the first direction, and the height of the pole lug group in the first direction is 0.8 mm-2. 5mm, so that the connection strength of the pole lug group can be ensured, the occupied space of the pole lug group is reduced, and the improvement of the space utilization rate is facilitated; the current flowing path of the tab group can be shortened, the internal resistance of the tab group can be reduced, the heat productivity of the battery can be reduced, the performance and safety of the battery can be improved, the production efficiency can be improved, and the production cost can be reduced.

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 relatively large internal space, reducing the space utilization rate and increasing the production cost. At the same time, in a harsh environment such as when the pole group is vibrated, the tab group is prone to risks such as tearing, which can easily cause safety risks such as thermal runaway of the battery. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the utility model is to provide a pole group that 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, improving the performance and safety of the battery, and improving the production efficiency.

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

[0005] According to an embodiment of the utility model, the pole group is a wound pole group and includes: a pole group body; a tab group, the tab group is 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] According to the pole group of the embodiment of the utility model, by using a wound pole group, with the tab group provided 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, it is possible to ensure the connection strength of the tab group while reducing the occupied space 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, be convenient for reducing the heat generation of the battery, be beneficial to improving the performance and safety of the battery, and at the same time can improve the production efficiency and reduce the production cost.

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

[0008] According to some embodiments of the utility model, the pole group body includes: a plurality of pole pieces, the plurality of pole pieces are stacked and wound in a second direction, a separator is provided between adjacent two of the pole pieces, one end of each pole piece along the first direction is provided with a tab, and the plurality of 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, the plurality of 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, there are a plurality of tabs, and the plurality of tabs are arranged at intervals along the third direction. The winding radius of the electrode assembly body is R i , the length of the equal-thickness section of the electrode assembly body along the third direction is L, the length of the tab along the third direction is L1, and the distance between two adjacent tabs is L2, where L2 = 2L + πR i - L1, where i is the number of winding turns of the electrode sheet and is an integer.

[0013] 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 electrode assembly body along the first direction.

[0014] According to some embodiments of the present utility model, the thickness of the electrode assembly body in the second direction is 8 mm - 25 mm.

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

[0016] For the battery according to an embodiment of the present utility model, since the electrode assembly is a wound electrode assembly and the tab group is arranged at one end of the electrode assembly 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. At the same time, it 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. At the same time, it can improve the production efficiency and reduce the production cost.

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

[0018] Some additional aspects and advantages of the present utility model will be given in the following description, some will become obvious from the following description, or will 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, where:

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

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

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

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

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

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

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

[0027] Reference numerals:

[0028] 100, pole group;

[0029] 10, pole group body; 11, electrode plate; 12, tab; 111, positive electrode plate; 112, negative electrode plate; 121, pole 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 by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "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. It 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 therefore should not be construed as a limitation on the present utility model.

[0033] In the description of the present utility model, the "first feature" and "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] Next, the pole group 100 according to an embodiment of the present utility model will be described with reference to the drawings.

[0035] Refer to Figures 1 - 5 As shown, the pole group 100 according to an embodiment of the present utility model is a wound pole group. The production process of the wound pole group is mature, which is beneficial to improving production efficiency and reducing production costs. And the pole group 100 may include: a pole group body 10 and a tab group 20.

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

[0037] In addition, as Figure 3As shown, the height of the tab group 20 in the first direction is 0.8 mm - 2.5 mm, that is, the height of the 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 tab group 20, the height of the tab group 20 can be reduced, thereby reducing the occupied space of the tab group 20, which is beneficial to improving the space utilization rate, reducing the production cost. At the same time, the current flow path of the tab group 20 can be shortened, the internal resistance of the tab group 20 can be reduced, which is convenient for reducing the heat generation of the battery and improving the performance of the battery. Moreover, the risk of tearing due to the relatively high height of the tab group 20 can be avoided, which is beneficial to improving the safety performance of the battery. For example, in some specific embodiments, the height of the tab group 20 in the first direction can be 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0038] According to the electrode assembly 100 of the embodiment of the present invention, since the electrode assembly 100 is a wound electrode assembly, the tab group 20 is provided at one end of the electrode assembly body 10 in the first direction, and the height of the tab group 20 in the first direction is 0.8 mm - 2.5 mm. While ensuring the connection strength of the tab group 20, the occupied space of the tab group 20 can be reduced, which is beneficial to improving the space utilization rate. And the current flow path of the tab group 20 can be shortened, the internal resistance of the tab group 20 can be reduced, which is convenient for reducing the heat generation of the battery, beneficial to improving the performance and safety of the battery. At the same time, the production efficiency can be improved and the production cost can be reduced.

[0039] In some embodiments of the present invention, as Figures 1 - 7 shown, the electrode assembly body 10 includes a plurality of (greater than or equal to two) electrode plates 11, and the plurality of electrode plates 11 are stacked and wound in the second direction to form the electrode assembly 100. A separator is provided between adjacent two electrode plates 11, so that the separator can isolate the electrode plates 11 to prevent short - circuit phenomena and ensure the normal use of the electrode assembly 100. At the same time, the energy density of the electrode assembly 100 can be increased by the plurality of electrode plates 11, which is convenient for storing more electric energy.

[0040] In addition, as Figure 6 shown in Figure 7 and

[0041] shown, an electrode tab 12 is provided at one end of the electrode plate 11 in the first direction, and the plurality of electrode tabs 12 are bent in the second direction, and the plurality of electrode tabs 12 are connected to each other to form the 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. Figure 6 In some embodiments, as Figure 7As shown, a plurality of electrode tabs 11 include a positive electrode tab 111 and a negative electrode tab 112. The positive electrode tab 111 and the negative electrode tab 112 are stacked on top of each other in the second direction, such that the polarities of two adjacent electrode tabs 11 are opposite, which can meet the required assembly requirements. A separator is provided between the adjacent positive electrode tab 111 and negative electrode tab 112, which can ensure the normal use of the electrode group 100.

[0042] In the related art, the tab needs to extend a long section. The tabs of a plurality of electrode tabs are connected together by welding (such as ultrasonic welding), and then connected by bending and welding to an external structure, which results in a large occupation of internal space, low space utilization rate, and high cost. In addition, under harsh environments such as vibration of the electrode group, the bent tab is prone to risks such as tearing, causing safety risks such as thermal runaway.

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

[0044] According to some embodiments of the present invention, as Figure 6 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, reliable connection of the plurality of tabs 12 can be ensured, ensuring that the tab 12 can have sufficient current-carrying capacity, meeting the required connection requirements, and facilitating 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, as Figure 6 shown in Figure 7 figures, the tab 12 includes a plurality of (greater than or equal to two) tab blocks 121. 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. The bending of the tab 12 is facilitated by the plurality of tab blocks 121, making the bending of the tab 12 more convenient, 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 conducive to improving production efficiency.

[0047] According to some embodiments of the present utility model, as Figure 6 shown, there are multiple (greater than or equal to two) tab ears 12, and the multiple tab ears 12 are arranged at intervals along the third direction. The winding radius of the electrode group body 10 is R i , the length of the equal-thickness section of the electrode group body 10 along the third direction is L, the length of the tab ear 12 along the third direction is L1, and the distance between two adjacent tab ears 12 is L2, and L2 = 2L + πR i - L1, where i is the number of winding turns of the electrode sheet 11 and is an integer. Thus, by making the distance between two adjacent tab ears 12 satisfy the above formula, when multiple electrode sheets 11 are wound and formed, it can be ensured that the multiple tab ears 12 are opposite to each other one by one, which is convenient for connecting the multiple tab ears 12 to each other, thereby ensuring reliable connection of the multiple tab ears 12, meeting the required connection requirements, and improving the assembly efficiency. For example, i can be 1, 2, 3, 4, etc.

[0048] According to some embodiments of the present utility model, the tab ear group 20 can be a positive tab ear 21 or a negative tab ear 22. While ensuring the structural strength, it can reduce the occupied space of the positive tab ear 21 or the negative tab ear 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 ear 21 or the negative tab ear 22, reduce the internal resistance of the positive tab ear 21 or the negative tab ear 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 tab ear 21 or the negative tab ear 22, which is beneficial to improving the safety performance of the battery.

[0049] Or, as Figures 1 - 5 shown, there are multiple tab ear groups 20, and the multiple tab ear groups 20 include a positive tab ear 21 and a negative tab ear 22. The positive tab ear 21 and the negative tab ear 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 the external structure through the positive tab ear 21 and the negative tab ear 22. While ensuring the structural strength of the positive tab ear 21 and the negative tab ear 22, it can reduce the occupied space of the positive tab ear 21 and the negative tab ear 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 ear 21 and the negative tab ear 22, reduce the internal resistance of the positive tab ear 21 and the negative tab ear 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 tab ear 21 and the negative tab ear 22, which is beneficial to improving the safety performance of the battery.

[0050] In some embodiments, the positive tab ear 21 and the negative tab ear 22 can be located on the same side of the electrode group body 10, which can improve the space utilization rate and reduce the manufacturing difficulty, and is beneficial to improving the production efficiency.

[0051] In some embodiments of the present utility model, as Figure 4As 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-mentioned dimensional 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.

[0052] In some embodiments, such as Figure 2 As shown, the height of the electrode group body 10 in the first direction is greater than or equal to 300 mm, that is, the height of the electrode group body 10 in the first direction is H3 and satisfies H3 ≥ 300 mm. Within the above-mentioned dimensional range, the energy density of the battery can be improved to meet the usage requirements of the battery. Moreover, since 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, the occupied space of the battery can be reduced, which is beneficial to improving the space utilization rate. For example, in some specific embodiments, the height of the electrode group body 10 in 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 invention includes the electrode group 100 according to an embodiment of the present invention. Since the electrode group 100 according to an embodiment of the present invention has the above-mentioned beneficial technical effects, the battery according to an embodiment of the present invention, through the electrode group 100 being a wound electrode group, the tab group 20 is provided at one end of the electrode group body 10 in the first direction, and the height of the tab group 20 in the first direction is 0.8 mm - 2.5 mm, can ensure the connection strength of the tab group 20 while reducing the occupied space 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, which is beneficial to improving the performance and safety of the battery, and at the same time can improve the production efficiency and reduce the production cost.

[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 group 100 is disposed in the housing, which is convenient for placing the electrode group 100, and the cover plate is covered on the opening. Through the cover plate, the opening can be sealed to ensure reliable protection of the electrode group 100, thereby ensuring reliable sealing of the electrode group 100 and preventing the electrode group 100 from being exposed and damaged.

[0055] In some embodiments of the present invention, 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 pole group 100 according to the embodiments of the present utility model, as well as other components and operations of the battery, are known to those of ordinary skill in the art and will not be described in detail herein.

[0057] In the description of the present utility model, it should be noted that, unless otherwise clearly defined 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 with reference 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 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. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A pole group, characterized in that: The pole group is a wound pole group and comprises: The body of the pole group; 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 and wound on each other in a second direction, 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, 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 2, characterized in that: There are multiple pole ears, and the multiple pole ears are arranged at intervals along the third direction. The winding radius of the pole group body is R i The length of the equal thickness section of the pole group body along the third direction is L, the length of the pole lug along the third direction is L1, and the distance between two adjacent pole lugs is L2. <h2 style=";text-align:left;direction:ltr">L2 = 2L + πR<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> -L1 Wherein, i is the number of winding turns of the pole piece and is an integer.

7. 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.

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

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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