Tab structure, blade cell and blade battery

Abstract

The utility model provides a tab structure, a blade cell and a blade battery. The tab structure is applied to a multi-pole group, a plurality of pole groups are arranged in the multi-pole group, and the plurality of pole groups are sequentially stacked along a first direction; positive tabs and negative tabs which are oppositely arranged are arranged on the pole groups, a plurality of positive tabs of the pole groups are positioned on the same side, a plurality of negative tabs of the pole groups are positioned on the same side, the positive tabs on the adjacent pole groups are arranged in a staggered manner, and the negative tabs on the adjacent pole groups are arranged in a staggered manner. Compared with a traditional mode that the tabs are overlapped together after two pole assemblies are combined, the mode that the tabs on the pole assemblies are arranged in a staggered mode has the advantages that the number of layers of the tabs is small, the tabs on the two pole assemblies are not connected or overlapped in a large-energy-storage battery cell project, the thickness is reduced, the ultrasonic welding process is easy to penetrate, and the welding efficiency is improved. In other words, the tabs and the connecting pieces can be welded together in an ultrasonic welding mode; in addition, the reduction of the thickness does not affect the subsequent bending process.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a tab structure, a blade cell, and a blade battery. Background Art

[0002] In the existing lithium battery structure, taking a bipolar group battery cell with a connecting piece as an example, the connection between the bipolar group and the cover plate is achieved by welding a group of pole ears and the connecting piece to form a passage.

[0003] During the welding process, the bipolar battery cells are first overlapped by the tabs at the same position and ultrasonically welded; secondly, the connecting piece is laser welded to the cover collector; finally, the tabs are ultrasonically welded to the connecting piece to complete the internal and external paths of the battery cells. However, this method has the following problems: With the use of blade batteries in energy storage projects, the industry requires larger and larger single battery capacity, and the battery thickness is getting thicker and thicker. The more layers of the pole group, the thicker the tabs. When using the existing welding method, the tabs are thicker. When ultrasonically welding with the connecting piece, the ultrasonic energy cannot penetrate the tabs, resulting in abnormal welding. In addition, the tabs are too thick and hard to bend, which makes them difficult to bend.

[0004] Therefore, there is an urgent need for a tab structure, a blade cell and a blade battery to solve the technical problems existing in the prior art to a certain extent. Utility Model Content

[0005] The purpose of this application is to provide a pole ear structure, a blade cell and a blade battery, which to a certain extent solve the technical problem in the prior art of poor welding effect caused by the excessive thickness of the pole ear of the blade battery.

[0006] The present application provides a pole ear structure, including a pole group;

[0007] There are a plurality of pole groups, and the plurality of pole groups are stacked in sequence along a first direction;

[0008] The electrode groups are provided with positive electrode ears and negative electrode ears arranged opposite to each other, the multiple positive electrode ears of the multiple electrode groups are located on the same side, the multiple negative electrode ears of the multiple electrode groups are located on the same side, and the positive electrode ears on adjacent electrode groups are staggered, and the negative electrode ears on adjacent electrode groups are staggered.

[0009] In the above technical solution, further, the pole groups are provided with two, namely pole group No. 1 and pole group No. 2;

[0010] The first electrode group has a first positive electrode ear and a first negative electrode ear, and the second electrode group has a second positive electrode ear and a second negative electrode ear;

[0011] The No. 1 positive electrode tab has a No. 1 positive root portion and a No. 1 positive bend portion at a first preset angle to the No. 1 positive root portion, and the No. 2 positive electrode tab has a No. 2 positive root portion and a No. 2 positive bend portion at the first preset angle to the No. 2 positive root portion; the No. 1 positive root portion and the No. 2 positive root portion are arranged staggered, the No. 1 positive bend portion is bent at the No. 1 positive root portion at a first position, the No. 2 positive bend portion is bent at the No. 2 positive root portion at a second position, and the No. 1 positive bend portion and the No. 2 positive bend portion are arranged along the second direction;

[0012] The No. 1 negative electrode ear has a No. 1 negative root and a No. 1 negative bend portion which is at a second preset angle to the No. 1 negative root, and the No. 2 negative electrode ear has a No. 2 negative root and a No. 2 negative bend portion which is at the second preset angle to the No. 2 negative root; the No. 1 negative root and the No. 2 negative root are staggered, the No. 1 negative bend portion is bent at the No. 1 negative root at a third position, the No. 2 negative bend portion is bent at the No. 2 negative root at a fourth position, and the No. 1 negative bend portion and the No. 2 negative bend portion are arranged along the second direction.

[0013] In the above technical solution, further, the first preset angle and the second preset angle are both 90°.

[0014] In the above technical solution, further, there are four pole groups, namely pole group No. 1, pole group No. 2, pole group No. 3 and pole group No. 4;

[0015] The first electrode group has a first positive electrode ear and a first negative electrode ear; the second electrode group has a second positive electrode ear and a second negative electrode ear; the third electrode group has a third positive electrode ear and a third negative electrode ear; the fourth electrode group has a fourth positive electrode ear and a fourth negative electrode ear;

[0016] The No. 1 positive electrode ear has a No. 1 positive root portion and a No. 1 positive bend portion at a first preset angle with the No. 1 positive root portion, the No. 2 positive electrode ear has a No. 2 positive root portion and a No. 2 positive bend portion at the second preset angle with the No. 2 positive root portion; the No. 3 positive electrode ear has a No. 3 positive root portion and a No. 3 positive bend portion at a third preset angle with the No. 3 positive root portion, the No. 4 positive electrode ear has a No. 4 positive root portion and a No. 4 positive bend portion at the fourth preset angle with the No. 4 positive root portion; the No. 1 positive root portion, the No. 2 positive root portion, the No. 3 positive root portion and the No. 4 positive root portion are staggered, the No. 1 positive bend portion is bent at the No. 1 positive root portion at a first position, the No. 2 positive bend portion is bent at the No. 2 positive root portion at a second position, the No. 3 positive bend portion is bent at the No. 3 positive root portion at a third position, and the No. 4 positive bend portion is bent at the No. 4 positive root portion at a fourth position;

[0017] The No. 1 negative electrode ear has a No. 1 negative root and a No. 1 negative bend portion which is at a fifth preset angle with the No. 1 negative root; the No. 2 negative electrode ear has a No. 2 negative root and a No. 2 negative bend portion which is at a sixth preset angle with the No. 2 negative root; the No. 3 negative electrode ear has a No. 3 negative root and a No. 3 negative bend portion which is at a seventh preset angle with the No. 3 negative root; the No. 4 negative electrode ear has a No. 4 negative root and a No. 4 negative bend portion which is at an eighth preset angle with the No. 4 negative root; the No. 1 negative root, the No. 2 negative root, the No. 3 negative root and the No. 4 negative root are staggered, the No. 1 negative bend portion is bent at the No. 1 negative root at a fifth position, the No. 2 negative bend portion is bent at the No. 2 negative root at a sixth position, the No. 3 negative bend portion is bent at the No. 3 negative root at a seventh position, and the No. 4 negative bend portion is bent at the No. 4 negative root at an eighth position.

[0018] In the above technical solution, further, the first preset angle, the second preset angle, the third preset angle, the fourth preset angle, the fifth preset angle, the sixth preset angle, the seventh preset angle, and the eighth preset angle are all set between 0° and 180°.

[0019] In the above technical solution, further, there are four pole groups, namely pole group No. 1, pole group No. 2, pole group No. 3 and pole group No. 4;

[0020] The first electrode group has a first positive electrode ear and a first negative electrode ear; the second electrode group has a second positive electrode ear and a second negative electrode ear; the third electrode group has a third positive electrode ear and a third negative electrode ear; the fourth electrode group has a fourth positive electrode ear and a fourth negative electrode ear;

[0021] The No. 1 positive electrode tab has a No. 1 positive root portion and a No. 1 positive bend portion at a first preset angle to the No. 1 positive root portion, the No. 2 positive electrode tab has a No. 2 positive root portion and a No. 2 positive bend portion at a second preset angle to the No. 2 positive root portion; the No. 3 positive electrode tab has a No. 3 positive root portion and a No. 3 positive bend portion at a third preset angle to the No. 3 positive root portion, and the No. 4 positive electrode tab has a No. 4 positive root portion and a No. 4 positive bend portion at a fourth preset angle to the No. 4 positive root portion;

[0022] The first positive root portion, the second positive root portion, the third positive root portion and the fourth positive root portion are arranged in a staggered manner, the first positive bending portion is bent at the first positive root portion at a first position, the second positive bending portion is bent at the second positive root portion at a second position, the third positive bending portion is bent at the third positive root portion at a third position and the first position is directly opposite to the third position, the fourth positive bending portion is bent at the fourth positive root portion at a fourth position and the second position is directly opposite to the fourth position;

[0023] The No. 1 negative electrode tab has a No. 1 negative root and a No. 1 negative bend at a fifth preset angle with the No. 1 negative root; the No. 2 negative electrode tab has a No. 2 negative root and a No. 2 negative bend at a sixth preset angle with the No. 2 negative root; the No. 3 negative electrode tab has a No. 3 negative root and a No. 3 negative bend at a seventh preset angle with the No. 3 negative root; the No. 4 negative electrode tab has a No. 4 negative root and a No. 4 negative bend at an eighth preset angle with the No. 4 negative root;

[0024] The negative root No. 1, the negative root No. 2, the negative root No. 3 and the negative root No. 4 are staggered, the negative bend No. 1 is bent at the negative root No. 1 at the fifth position, the negative bend No. 2 is bent at the negative root No. 2 at the sixth position, the negative bend No. 3 is bent at the negative root No. 3 at the seventh position and the fifth position is opposite to the seventh position, the negative bend No. 4 is bent at the negative root No. 4 at the eighth position and the sixth position is opposite to the eighth position.

[0025] In the above technical solution, further, the first preset angle, the second preset angle, the third preset angle, the fourth preset angle, the fifth preset angle, the sixth preset angle, the seventh preset angle, and the eighth preset angle are all set between 30° and 180°.

[0026] The present application also provides a blade battery cell, comprising a positive connecting piece, a negative connecting piece and a tab structure;

[0027] The positive connecting piece and the negative connecting piece are both in plate-like structures;

[0028] The positive connecting piece extends along the second direction and covers a plurality of positive electrode tabs on the plurality of electrode groups; the negative connecting piece extends along the second direction and covers a plurality of negative electrode tabs on the plurality of electrode groups;

[0029] The positive connecting piece is welded to a plurality of positive electrode tabs on the electrode group, and the negative connecting piece is welded to a plurality of negative electrode tabs on the electrode group.

[0030] In the above technical solution, further, the blade battery cell also includes a cover plate;

[0031] The cover plates are provided with two, and the two cover plates are located at the positive electrode ear side and the negative electrode ear side respectively;

[0032] A current collector is disposed on the cover plate, and the current collector is welded to the positive connecting piece and to the negative connecting piece.

[0033] The present application also provides a blade battery, comprising the above-mentioned blade battery cell.

[0034] Compared with the prior art, this application has the following beneficial effects:

[0035] The present application provides a pole ear structure, comprising a pole group;

[0036] There are a plurality of pole groups, and the plurality of pole groups are stacked in sequence along a first direction;

[0037] The electrode groups are provided with positive electrode ears and negative electrode ears arranged opposite to each other, the multiple positive electrode ears of the multiple electrode groups are located on the same side, the multiple negative electrode ears of the multiple electrode groups are located on the same side, and the positive electrode ears on adjacent electrode groups are staggered, and the negative electrode ears on adjacent electrode groups are staggered.

[0038] In summary, compared with the traditional method in which the pole ears on the pole group are overlapped after the two pole groups are merged, the staggered arrangement of the pole ears on this pole group will produce fewer pole ear layers in the large energy storage battery cell project in this application. The pole ears on the two pole groups are not connected or overlapped, and the thickness is also reduced, making it easy for the ultrasonic welding process to penetrate, that is, the pole ears and the connecting sheets can be welded together by ultrasonic welding; in addition, the reduction in thickness will not affect the subsequent bending process.

[0039] The present application also provides a blade battery cell, comprising a positive connecting piece, a negative connecting piece and the above-mentioned pole ear structure;

[0040] The positive connecting piece and the negative connecting piece are both in plate-like structures;

[0041] The positive connecting piece extends along the second direction and covers a plurality of positive electrode tabs on the plurality of electrode groups; the negative connecting piece extends along the second direction and covers a plurality of negative electrode tabs on the plurality of electrode groups;

[0042] The positive connecting piece is welded to a plurality of positive electrode tabs on the electrode group, and the negative connecting piece is welded to a plurality of negative electrode tabs on the electrode group.

[0043] In summary, in this embodiment, since the multiple pole tabs of the multiple pole groups are staggered, when the pole tabs and the connecting plates are welded together by ultrasonic welding, it is possible to ensure that the ultrasonic wave penetrates the connecting plate and the pole tabs, thereby ensuring the welding quality.

[0044] The present application also provides a blade battery, including a blade cell, and thus has all the beneficial effects of the blade cell, which will not be elaborated in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a schematic structural diagram of the tab structure provided in Example 1 of the present application at a first viewing angle;

[0047] Figure 2 This is a schematic structural diagram of the tab structure provided in Example 1 of the present application at a second viewing angle;

[0048] Figure 3 This is a schematic structural diagram of the tab structure provided in the first embodiment of the present application at a third viewing angle;

[0049] Figure 4 It is a schematic structural diagram of the tab structure provided in the first embodiment of the present application at a fourth viewing angle;

[0050] Figure 5 It is a schematic structural diagram of the tab structure provided in the first embodiment of the present application at a fifth viewing angle;

[0051] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0052] Figure 7 This is a schematic diagram of the structure of the blade battery provided in Example 4 of the present application.

[0053] Figure markings: 2-first direction; 3-pole group No. 1; 4-pole group No. 2; 5-positive electrode ear No. 1; 6-negative electrode ear No. 1; 7-positive electrode ear No. 2; 8-negative electrode ear No. 2; 9-second direction; 10-positive connecting piece; 11-negative connecting piece; 12-positive root No. 1; 13-positive bending portion No. 1; 14-positive root No. 2; 15-positive bending portion No. 2. DETAILED DESCRIPTION

[0054] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0055] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0056] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0057] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0058] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0059] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0060] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0061] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0062] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0063] Embodiment 1

[0064] Combine the following Figure 1-Figure 6 A pole ear structure provided in this embodiment of the present application is described in detail.

[0065] In this embodiment, a pole tab structure is provided. The pole tab structure includes a pole group.

[0066] Specifically, a plurality of pole groups are provided, and the plurality of pole groups are stacked along a first direction 2; preferably, the first direction 2 is a thickness direction of the pole group, that is, the plurality of pole groups are stacked together in sequence along the thickness of the pole group.

[0067] Specifically, the electrode group has a positive electrode ear and a negative electrode ear that are arranged opposite to each other; preferably, the electrode group has a positive electrode ear and a negative electrode ear respectively arranged at two ends along its length direction.

[0068] Specifically, multiple pole groups are formed with multiple positive pole ears, and multiple pole groups are formed with multiple negative pole ears. The multiple positive pole ears are located at one end of the pole group along its length direction, and the multiple negative pole ears are located at the other end of the pole group along its length direction. The positive pole ears on adjacent pole groups are staggered, and the negative pole ears on adjacent pole groups are staggered.

[0069] Taking the case where there are two electrode groups as an example, the meaning of staggered arrangement of positive electrode ears on adjacent electrode groups and staggered arrangement of negative electrode ears on adjacent electrode groups is explained in detail below.

[0070] There are two electrode groups, namely, electrode group No. 1 3 and electrode group No. 2 4, wherein electrode group No. 1 3 has a first positive electrode ear 5 and a first negative electrode ear 6 respectively arranged along its length direction, and electrode group No. 2 4 has a second positive electrode ear 7 and a second negative electrode ear 8 respectively arranged along its length direction.

[0071] Specifically, the No. 1 positive electrode tab 5 has a No. 1 positive root portion and a No. 1 positive bend portion 13 which is at a first preset angle with the No. 1 positive root portion 12, and the No. 2 positive electrode tab 7 has a No. 2 positive root portion 14 and a No. 2 positive bend portion 15 which is at a first preset angle with the No. 2 positive root portion 14; the No. 1 positive root portion 12 and the No. 2 positive root portion 14 are staggered, that is, the No. 1 positive root portion 12 and the No. 2 positive root portion 14 do not overlap;

[0072] Further, the No. 1 positive bending portion is bent at the No. 1 positive root portion 12 at a first position, and the first position here can be understood as a point of intersection of the No. 1 pole group 3 and the No. 2 pole group 4; the No. 2 positive bending portion is bent at the No. 2 positive root portion 14 at a second position, and the second position here can be understood as another point of intersection of the No. 1 pole group 3 and the No. 2 pole group 4 that is not used in the first position (that is, the first position and the second position are different points on the same straight line (second direction)).

[0073] Furthermore, the No. 1 positive bend portion and the No. 2 positive bend portion are arranged along the second direction 9. Since the No. 1 positive root portion 12 and the No. 2 positive root portion 14 are staggered and do not overlap, the No. 1 positive bend portion and the No. 2 positive bend portion are also staggered and do not overlap. The second direction 9 here refers to the width direction of the pole group, that is, the No. 1 positive bend portion and the No. 2 positive bend portion are arranged along the width direction of the pole group.

[0074] Specifically, the positional relationship between the No. 1 negative electrode ear 6 and the No. 2 negative electrode ear 8 is the same as the positional relationship between the No. 1 positive electrode ear 5 and the No. 2 positive electrode ear 7; specifically, the No. 1 negative electrode ear 6 has a No. 1 negative root and a No. 1 negative bend portion at a second preset angle to the No. 1 negative root, and the No. 2 negative electrode ear 8 has a No. 2 negative root and a No. 2 negative bend portion at a second preset angle to the No. 2 negative root; the No. 1 negative root and the No. 2 negative root are staggered, that is, the No. 1 negative root and the No. 2 negative root do not overlap.

[0075] Furthermore, the No. 1 negative bend portion is bent at the No. 1 negative root portion at a third position. Preferably, the third position here can be understood as a point of intersection between the No. 1 pole group 3 and the No. 2 pole group 4; the No. 2 negative bend portion is bent at the No. 2 negative root portion at a fourth position. The fourth position here can be understood as another point of intersection between the No. 1 pole group 3 and the No. 2 pole group 4.

[0076] Furthermore, the first negative bend portion and the second negative bend portion are arranged along the second direction 9, where the second direction 9 refers to the width direction of the electrode group, and it can be understood that the first negative bend portion and the second negative bend portion are arranged along the width direction of the electrode group. That is, whether it is the first electrode group 3 or the second electrode group 4, the first positive electrode ear 5 and the second positive electrode ear 7, and the first negative electrode ear 6 and the second negative electrode ear 8 are staggered and do not overlap.

[0077] Preferably, the first preset angle and the second preset angle are both 90°, that is, the No. 1 positive root 12 is vertically connected to the No. 1 positive bend portion, the No. 2 positive root 14 is vertically connected to the No. 2 positive bend portion, the No. 1 negative root is vertically connected to the No. 1 negative bend portion, and the No. 2 negative root is vertically connected to the No. 2 negative bend portion.

[0078] Preferably, the first positive root 12, the second positive root 14, the first negative root and the second negative root are structures with triangular cross-sections, and the first positive bend portion, the second positive bend portion, the first negative bend portion and the second negative bend portion are all flat plate structures.

[0079] In summary, compared with the traditional method in which the pole ears on the pole group are overlapped after the two pole groups are merged, the staggered arrangement of the pole ears on this pole group will produce fewer pole ear layers in the large energy storage battery cell project in this application. The pole ears on the two pole groups are not connected or overlapped, and the thickness is also reduced, making it easy for the ultrasonic welding process to penetrate, that is, the pole ears and the connecting sheets can be welded together by ultrasonic welding; in addition, the reduction in thickness will not affect the subsequent bending process.

[0080] Embodiment 2

[0081] In this embodiment, four pole groups are taken as an example for detailed description.

[0082] Specifically, the four pole groups are pole group No. 1, pole group No. 2, pole group No. 3 and pole group No. 4, which are stacked in sequence along the thickness direction of the pole groups; wherein pole group No. 1 has a positive pole ear No. 1 and a negative pole ear No. 1, which are respectively arranged at the two ends of the length direction of pole group No. 1; pole group No. 2 has a positive pole ear No. 2 and a negative pole ear No. 2, which are respectively arranged at the two ends of pole group No. 2 along its length direction; pole group No. 3 has a positive pole ear No. 3 and a negative pole ear No. 3, which are respectively arranged at the two ends of pole group No. 3 along its length direction; pole group No. 4 has a positive pole ear No. 4 and a negative pole ear No. 4, which are respectively arranged at the two ends of pole group No. 4 along its length direction.

[0083] Specifically, the No. 1 positive electrode ear includes a No. 1 positive root portion and a No. 1 positive bend portion which is at a first preset angle with the No. 1 positive root portion, the No. 2 positive electrode ear 7 includes a No. 2 positive root portion 14 and a No. 2 positive bend portion which is at a first preset angle with the No. 2 positive root portion; the No. 3 positive electrode ear includes a No. 3 positive root portion and a No. 3 positive bend portion which is at a first preset angle with the No. 3 positive root portion, and the No. 4 positive electrode ear includes a No. 4 positive root portion and a No. 4 positive bend portion which is at a first preset angle with the No. 4 positive root portion; further, the No. 1 positive root portion, the No. 2 positive root portion, the No. 3 positive root portion and the No. 4 positive root portion are respectively formed on the end faces of the No. 1 pole group, the No. 2 pole group, the No. 3 pole group and the No. 4 pole group.

[0084] Furthermore, the first preset angle, the second preset angle, the third preset angle and the fourth preset angle are set between 0° and 180°.

[0085] Further, the No. 1 positive root, the No. 2 positive root, the No. 3 positive root and the No. 4 positive root are staggered, the No. 1 positive bending portion is bent at the No. 1 positive root at a first position, and the first position is preferably the first point where the No. 1 pole group and the No. 2 pole group intersect; the No. 2 positive bending portion is bent at the No. 2 positive root at a second position, and the second position is preferably the second point where the No. 2 pole group and the No. 3 pole group intersect; the No. 3 positive bending portion is bent at the No. 3 positive root at a third position, and the third position is preferably the third point where the No. 3 pole group and the No. 4 pole group intersect; the No. 4 positive bending portion is bent at the No. 4 positive root at a fourth position, and the fourth position is preferably the side of the No. 4 pole group away from the No. 3 pole group, that is, the No. 1 positive bending portion, the No. 2 positive bending portion, the No. 3 positive bending portion and the No. 4 positive bending portion are staggered whether in the first direction or the second direction.

[0086] It is worth noting that: although the first positive bending portion, the second positive bending portion, the third positive bending portion and the fourth positive bending portion are staggered and not in the same plane, it will not affect the welding with the connecting piece in the end, because the first bending portion, the second positive bending portion, the third positive bending portion and the fourth positive bending portion are all flexible and can be stretched, that is, after each bending portion is bent at the positive root at the corresponding position, the four bending portions are stretched to the same plane and then welded with the connecting piece. That is to say, the first preset angle, the second preset angle, the third preset angle and the fourth preset angle are all different at this time.

[0087] Furthermore, in the actual welding process, the example that the connecting piece is preferably located in the plane where the second pole group and the third pole group intersect is used for detailed explanation. The first positive bend portion, the second positive bend portion, the third positive bend portion and the fourth positive bend portion are all pulled to the plane where the second pole group 4 and the third pole group intersect, and are welded to the connecting piece.

[0088] It is worth noting that: since the No. 1 positive bend portion, the No. 2 positive bend portion, the No. 3 positive bend portion and the No. 4 positive bend portion are ultimately connected to the connecting plate within the plane where the No. 2 pole group intersects the No. 3 pole group, and since the distance from the No. 1 pole group to the intersecting plane is greater than the distance from the No. 2 pole group to the intersecting plane, the first preset angle is greater than the second preset angle. Similarly, the fourth preset angle is greater than the third preset angle.

[0089] In addition, in this embodiment, the positive bend portion No. 1, the positive bend portion No. 2, the positive bend portion No. 3 and the positive bend portion No. 4 are not limited to being ultimately connected to the connecting piece located in the plane where the second pole group and the third pole group intersect, for example, they can also be connected to the connecting piece located in the plane where the first pole group and the second pole group intersect.

[0090] Specifically, the No. 1 negative electrode ear has a No. 1 negative root and a No. 1 negative bend portion which is at a fifth preset angle with the No. 1 negative root, the No. 2 negative electrode ear has a No. 2 negative root and a No. 2 negative bend portion which is at a sixth preset angle with the No. 2 negative root; the No. 3 negative electrode ear has a No. 3 negative root and a No. 3 negative bend portion which is at a seventh preset angle with the No. 3 negative root, the No. 4 negative electrode ear has a No. 4 negative root and a No. 4 negative bend portion which is at an eighth preset angle with the No. 4 negative root; the No. 1 negative root, the No. 2 negative root, the No. 3 negative root and the No. 4 negative root are staggered, the No. 1 negative bend portion is bent at the No. 1 negative root at the fifth position, the No. 2 negative bend portion is bent at the No. 2 negative root at the sixth position, the No. 3 negative bend portion is bent at the No. 3 negative root at the seventh position, and the No. 4 negative bend portion is bent at the No. 4 negative root at the eighth position.

[0091] The principle of the negative electrode ear is the same as that of the positive electrode ear, so it will not be elaborated here.

[0092] In summary, the four pole ears of the four pole groups are staggered, that is, the four pole groups are not connected together, that is, the four pole groups are not directly stacked together at the same position. Compared with the traditional method, the present application will produce fewer pole ear layers in the large energy storage battery cell project and the thickness is also reduced, making it easy for the ultrasonic welding process to penetrate, that is, the pole ears and the connecting sheets can be welded together by ultrasonic welding; in addition, the reduction in thickness will not affect the subsequent bending process.

[0093] Embodiment 3

[0094] In this embodiment, four pole groups are still taken as an example to explain in detail another possible staggered arrangement of the four pole ears.

[0095] Specifically, the four pole groups are pole group No. 1, pole group No. 2, pole group No. 3 and pole group No. 4, which are stacked in sequence along the thickness direction of the pole groups; wherein pole group No. 1 has a positive pole ear No. 1 and a negative pole ear No. 1, which are respectively arranged at the two ends of the length direction of pole group No. 1; pole group No. 2 has a positive pole ear No. 2 and a negative pole ear No. 2, which are respectively arranged at the two ends of pole group No. 2 along its length direction; pole group No. 3 has a positive pole ear No. 3 and a negative pole ear No. 3, which are respectively arranged at the two ends of pole group No. 3 along its length direction; pole group No. 4 has a positive pole ear No. 4 and a negative pole ear No. 4, which are respectively arranged at the two ends of pole group No. 4 along its length direction.

[0096] Specifically, the No. 1 positive electrode ear includes a No. 1 positive root portion and a No. 1 positive bend portion which is at a first preset angle with the No. 1 positive root portion, the No. 2 positive electrode ear includes a No. 2 positive root portion and a No. 2 positive bend portion which is at a first preset angle with the No. 2 positive root portion; the No. 3 positive electrode ear includes a No. 3 positive root portion and a No. 3 positive bend portion which is at a first preset angle with the No. 3 positive root portion, and the No. 4 positive electrode ear includes a No. 4 positive root portion and a No. 4 positive bend portion which is at a first preset angle with the No. 4 positive root portion; further, the No. 1 positive root portion, the No. 2 positive root portion, the No. 3 positive root portion and the No. 4 positive root portion are respectively formed on the end surfaces of the No. 1 electrode group, the No. 2 electrode group, the No. 3 electrode group and the No. 4 electrode group.

[0097] Furthermore, the first preset angle, the second preset angle, the third preset angle and the fourth preset angle are set between 30° and 180°.

[0098] Furthermore, the first positive root portion, the second positive root portion, the third positive root portion and the fourth positive root portion are arranged in a staggered manner, the first positive bending portion is bent at the first positive root portion at a first position, and the first position is preferably a first point where the first pole group and the second pole group intersect; the second positive bending portion is bent at the second positive root portion at a second position, and the second position is preferably a point where the second pole group and the third pole group intersect; the third positive bending portion is bent at the third positive root portion at a third position, and the third position is preferably another point where the second pole group and the third pole group intersect, and the first position is directly opposite to the third position, so that The positive bending portion No. 3 overlaps with the positive bending portion No. 1 (the positive bending portion No. 3 overlaps with the positive bending portion No. 1 after being stretched); the positive bending portion No. 4 is bent at the positive root portion No. 4 at the fourth position, and the fourth position is preferably a point at the intersection of the pole group No. 3 and the pole group No. 4, and the fourth position is opposite to the second position, so that the positive bending portion No. 2 overlaps with the positive bending portion No. 4 (the positive bending portion No. 2 overlaps with the positive bending portion No. 4 after being stretched); that is, the positive bending portion No. 1, the positive bending portion No. 2, the positive bending portion No. 3 and the positive bending portion No. 4 are all staggered.

[0099] It is worth noting that: considering that the positive bend portion No. 1, the positive bend portion No. 2, the positive bend portion No. 3 and the positive bend portion No. 4 will eventually be welded to the connecting piece, assuming that the connecting piece is located in the plane formed by the No. 2 pole group and the No. 3 pole group, then in the actual welding process, it is only necessary to overlap the positive bend portion No. 1 and the positive bend portion No. 3 first, and then weld them to the connecting piece in the plane. The same applies to the positive bend portion No. 2 and the positive bend portion No. 4, which will not be elaborated.

[0100] Specifically, the structure of the negative electrode ear is as follows, the principle is the same as that of the positive electrode ear, and no further description is given. The first negative electrode ear has a first negative root and a first negative bend at a fifth preset angle with the first negative root, the second negative electrode ear has a second negative root and a second negative bend at a sixth preset angle with the second negative root; the third negative electrode ear has a third negative root and a third negative bend at a seventh preset angle with the third negative root, and the fourth negative electrode ear has a fourth negative root and a fourth negative bend at an eighth preset angle with the fourth negative root.

[0101] Furthermore, the negative root No. 1, the negative root No. 2, the negative root No. 3 and the negative root No. 4 are staggered, the negative bend No. 1 is bent at the negative root No. 1 at the fifth position, the negative bend No. 2 is bent at the negative root No. 2 at the sixth position, the negative bend No. 3 is bent at the negative root No. 3 at the seventh position and the fifth position is opposite to the seventh position, and the negative bend No. 4 is bent at the negative root No. 4 at the eighth position and the sixth position is opposite to the eighth position.

[0102] Preferably, the first preset angle, the second preset angle, the third preset angle, the fourth preset angle, the fifth preset angle, the sixth preset angle, the seventh preset angle and the eighth preset angle are all set between 30° and 180°.

[0103] In summary, the whole is composed of four superimposed pole groups, and the pole ears of two adjacent pole groups are staggered. In the process of connecting to the connecting piece, two bent portions are selected to overlap together, rather than four bent portions overlapping together in the prior art. Compared with the traditional method, the present application will produce fewer pole ear layers in the large energy storage battery cell project and the thickness is also reduced, making it easy for the ultrasonic welding process to penetrate, that is, the pole ears and the connecting piece can be welded together by ultrasonic welding; in addition, the reduction in thickness will not affect the subsequent bending process.

[0104] Embodiment 4

[0105] Combine the following Figure 7 As shown, a blade battery cell provided by the present application in this embodiment is described in detail.

[0106] In this embodiment, the blade cell includes a positive connecting piece 10, a negative connecting piece 11 and the above-mentioned tab structure.

[0107] Specifically, the positive connecting piece 10 and the negative connecting piece 11 are both plate-shaped structures; the positive connecting piece 10 extends along the second direction 9 and covers the multiple positive pole ears on the multiple pole groups; the negative connecting piece 11 extends along the second direction 9 and covers the multiple negative pole ears on the multiple pole groups. During the welding process, the positive connecting piece 10 can be welded together with the multiple positive pole ears on the multiple pole groups by ultrasonic welding, and the negative connecting piece 11 can be welded together with the multiple negative pole ears on the multiple pole groups by ultrasonic welding. Since the multiple pole ears on the multiple pole groups are arranged in a staggered manner compared with the existing ones, that is, the width of the multiple pole ears in the second direction 9 is wider than that of the existing technology, the connecting piece is designed as an extended structure so that it can cover all pole ears, thereby meeting the welding requirements.

[0108] Specifically, the blade battery cell also includes a cover plate; two cover plates are provided, namely a positive cover plate corresponding to the positive ear side, and a negative cover plate corresponding to the negative ear side, a current collector is provided on the cover plate, and laser welding is used to connect the current collector to the positive connecting plate 10 and to the negative electrode plate.

[0109] In summary, in this embodiment, since the multiple pole tabs of the multiple pole groups are staggered, when the pole tabs and the connecting plates are welded together by ultrasonic welding, it is possible to ensure that the ultrasonic wave penetrates the connecting plate and the pole tabs, thereby ensuring the welding quality.

[0110] Embodiment 5

[0111] In this embodiment, a blade battery is provided, which includes the above-mentioned blade battery cell, and thus has all the beneficial effects of the blade battery cell.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole ear structure; applied to a multi-pole group, wherein the multi-pole group has a plurality of pole groups, and the plurality of pole groups are stacked in sequence along a first direction; characterized in that: The electrode group has positive electrode ears and negative electrode ears arranged opposite to each other, the multiple positive electrode ears of the multiple electrode groups are located on the same side, the multiple negative electrode ears of the multiple electrode groups are located on the same side, and the positive electrode ears on adjacent electrode groups are staggered along the second direction, and the negative electrode ears on adjacent electrode groups are staggered along the second direction.

2. The tab structure according to claim 1, characterized in that: There are two pole groups, namely pole group No. 1 and pole group No. 2; The first electrode group has a first positive electrode ear and a first negative electrode ear, and the second electrode group has a second positive electrode ear and a second negative electrode ear; The No. 1 positive electrode tab has a No. 1 positive root portion and a No. 1 positive bend portion at a first preset angle to the No. 1 positive root portion, and the No. 2 positive electrode tab has a No. 2 positive root portion and a No. 2 positive bend portion at the first preset angle to the No. 2 positive root portion; the No. 1 positive root portion and the No. 2 positive root portion are arranged staggered, the No. 1 positive bend portion is bent at the No. 1 positive root portion at a first position, the No. 2 positive bend portion is bent at the No. 2 positive root portion at a second position, and the No. 1 positive bend portion and the No. 2 positive bend portion are arranged along the second direction; The No. 1 negative electrode ear has a No. 1 negative root and a No. 1 negative bend portion which is at a second preset angle to the No. 1 negative root, and the No. 2 negative electrode ear has a No. 2 negative root and a No. 2 negative bend portion which is at the second preset angle to the No. 2 negative root; the No. 1 negative root and the No. 2 negative root are staggered, the No. 1 negative bend portion is bent at the No. 1 negative root at a third position, the No. 2 negative bend portion is bent at the No. 2 negative root at a fourth position, and the No. 1 negative bend portion and the No. 2 negative bend portion are arranged along the second direction.

3. The tab structure according to claim 2, characterized in that: The first preset angle and the second preset angle are both 90°.

4. The tab structure according to claim 1, characterized in that: There are four pole groups, namely pole group No. 1, pole group No. 2, pole group No. 3 and pole group No. 4; The first electrode group has a first positive electrode ear and a first negative electrode ear; the second electrode group has a second positive electrode ear and a second negative electrode ear; the third electrode group has a third positive electrode ear and a third negative electrode ear; the fourth electrode group has a fourth positive electrode ear and a fourth negative electrode ear; The No. 1 positive electrode tab has a No. 1 positive root portion and a No. 1 positive bend portion at a first preset angle to the No. 1 positive root portion, the No. 2 positive electrode tab has a No. 2 positive root portion and a No. 2 positive bend portion at a second preset angle to the No. 2 positive root portion; the No. 3 positive electrode tab has a No. 3 positive root portion and a No. 3 positive bend portion at a third preset angle to the No. 3 positive root portion, and the No. 4 positive electrode tab has a No. 4 positive root portion and a No. 4 positive bend portion at a fourth preset angle to the No. 4 positive root portion; The first positive root portion, the second positive root portion, the third positive root portion and the fourth positive root portion are arranged in a staggered manner, the first positive bending portion is bent at the first positive root portion at a first position, the second positive bending portion is bent at the second positive root portion at a second position, the third positive bending portion is bent at the third positive root portion at a third position, and the fourth positive bending portion is bent at the fourth positive root portion at a fourth position; The No. 1 negative electrode tab has a No. 1 negative root and a No. 1 negative bend at a fifth preset angle to the No. 1 negative root; the No. 2 negative electrode tab has a No. 2 negative root and a No. 2 negative bend at a sixth preset angle to the No. 2 negative root; the No. 3 negative electrode tab has a No. 3 negative root and a No. 3 negative bend at a seventh preset angle to the No. 3 negative root; the No. 4 negative electrode tab has a No. 4 negative root and a No. 4 negative bend at an eighth preset angle to the No. 4 negative root; The negative root No. 1, the negative root No. 2, the negative root No. 3 and the negative root No. 4 are staggered, the negative bend No. 1 is bent at the negative root No. 1 at the fifth position, the negative bend No. 2 is bent at the negative root No. 2 at the sixth position, the negative bend No. 3 is bent at the negative root No. 3 at the seventh position, and the negative bend No. 4 is bent at the negative root No. 4 at the eighth position.

5. The tab structure according to claim 4, characterized in that: The angles of the first preset angle, the second preset angle, the third preset angle, the fourth preset angle, the fifth preset angle, the sixth preset angle, the seventh preset angle, and the eighth preset angle are all set between 0° and 180°.

6. The tab structure according to claim 1, characterized in that: There are four pole groups, namely pole group No. 1, pole group No. 2, pole group No. 3 and pole group No. 4; The first electrode group has a first positive electrode ear and a first negative electrode ear; the second electrode group has a second positive electrode ear and a second negative electrode ear; the third electrode group has a third positive electrode ear and a third negative electrode ear; the fourth electrode group has a fourth positive electrode ear and a fourth negative electrode ear; The No. 1 positive electrode tab has a No. 1 positive root portion and a No. 1 positive bend portion at a first preset angle to the No. 1 positive root portion, the No. 2 positive electrode tab has a No. 2 positive root portion and a No. 2 positive bend portion at a second preset angle to the No. 2 positive root portion; the No. 3 positive electrode tab has a No. 3 positive root portion and a No. 3 positive bend portion at a third preset angle to the No. 3 positive root portion, and the No. 4 positive electrode tab has a No. 4 positive root portion and a No. 4 positive bend portion at a fourth preset angle to the No. 4 positive root portion; The first positive root portion, the second positive root portion, the third positive root portion and the fourth positive root portion are arranged in a staggered manner, the first positive bending portion is bent at the first positive root portion at a first position, the second positive bending portion is bent at the second positive root portion at a second position, the third positive bending portion is bent at the third positive root portion at a third position and the first position is directly opposite to the third position, the fourth positive bending portion is bent at the fourth positive root portion at a fourth position and the second position is directly opposite to the fourth position; The No. 1 negative electrode tab has a No. 1 negative root and a No. 1 negative bend at a fifth preset angle to the No. 1 negative root; the No. 2 negative electrode tab has a No. 2 negative root and a No. 2 negative bend at a sixth preset angle to the No. 2 negative root; the No. 3 negative electrode tab has a No. 3 negative root and a No. 3 negative bend at a seventh preset angle to the No. 3 negative root; the No. 4 negative electrode tab has a No. 4 negative root and a No. 4 negative bend at an eighth preset angle to the No. 4 negative root; The negative root No. 1, the negative root No. 2, the negative root No. 3 and the negative root No. 4 are staggered, the negative bend No. 1 is bent at the negative root No. 1 at the fifth position, the negative bend No. 2 is bent at the negative root No. 2 at the sixth position, the negative bend No. 3 is bent at the negative root No. 3 at the seventh position and the fifth position is opposite to the seventh position, the negative bend No. 4 is bent at the negative root No. 4 at the eighth position and the sixth position is opposite to the eighth position.

7. The tab structure according to claim 6, characterized in that: The first preset angle, the second preset angle, the third preset angle, the fourth preset angle, the fifth preset angle, the sixth preset angle, the seventh preset angle, and the eighth preset angle are all set between 30° and 180°.

8. A blade battery cell, characterized in that: It comprises a positive connecting piece, a negative connecting piece and a tab structure as claimed in any one of claims 2 to 7; The positive connecting piece and the negative connecting piece are both in plate-like structures; The positive connecting piece extends along the second direction and covers a plurality of positive electrode tabs on the plurality of electrode groups; the negative connecting piece extends along the second direction and covers a plurality of negative electrode tabs on the plurality of electrode groups; The positive connecting piece is welded to a plurality of positive electrode tabs on the electrode group, and the negative connecting piece is welded to a plurality of negative electrode tabs on the electrode group.

9. The blade battery cell according to claim 8, characterized in that: The blade battery cell also includes a cover plate; The cover plates are provided with two, and the two cover plates are respectively located on the positive electrode ear side and the negative electrode ear side; A current collector is disposed on the cover plate, and the current collector is welded to the positive connecting piece and to the negative connecting piece.

10. A blade battery, characterized in that: Comprising the blade battery core described in claim 8 or 9.

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