Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery. The battery cell comprises a main body, at least one side of the main body along a first direction is provided with a tab side for arranging a tab, an accommodating groove is formed in the tab side and extends to the outer surface of the main body in a second direction, the second direction intersects with the first direction, and the accommodating groove is used for accommodating at least one part of the tab. The accommodating groove formed in the main body can provide an accommodating space for the tab when the tab is bent, so that one part of the tab is positioned in the accommodating groove, the probability that the tab protrudes out of the outer surface in the second direction of the main body after being bent is reduced, and the subsequent assembly and energy density of the battery cell are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core and a battery. Background Art

[0002] In the related art, after the transfer welding between the main body of the battery cell and the pole ear, the pole ear needs to be folded to make the pole ear in a suitable posture for subsequent connection and use. After the pole ear folding operation is completed, the pole ear of the battery cell of the related art still has a high probability of protruding from the end surface of the side of the battery cell body, affecting the subsequent assembly and energy density. Therefore, it is necessary to study and improve the above problems. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell that can ensure the subsequent assembly and energy density of the battery cell.

[0004] The utility model also provides a battery having the battery core.

[0005] According to the battery cell of the embodiment of the utility model, it includes a main body, and at least one side of the main body along the first direction has a pole ear side for setting the pole ear, and the pole ear side is formed with a receiving groove, and the receiving groove extends to the outer surface of the main body in the second direction. The second direction intersects with the first direction, and the receiving groove is used to receive at least a part of the pole ear.

[0006] The battery cell according to the embodiment of the utility model has at least the following beneficial effects: the accommodating groove arranged on the main body can provide an accommodating space for the pole ear when the pole ear is bent, so that a part of the pole ear is located in the accommodating groove, thereby reducing the probability of the pole ear protruding from the outer surface of the second direction of the main body after the bending is completed, thereby ensuring the subsequent assembly and energy density of the battery cell.

[0007] According to some embodiments of the present invention, the main body includes a plurality of pole segments stacked along the second direction, at least some of the pole segments are provided with a first groove, and the first groove defines the accommodating groove.

[0008] According to some embodiments of the present utility model, the main body includes a first pole segment group and a second pole segment group, the first pole segment group and the second pole segment group are stacked along a second direction, the first pole segment group and the second pole segment group each include at least one pole segment, the size of the pole segment of the first pole segment group in the first direction is smaller than the size of the pole segment of the second pole segment group in the first direction, and the accommodating groove is defined between the pole segment of the first pole segment group and the pole segment of the second pole segment group.

[0009] According to some embodiments of the utility model, the accommodating groove includes a first groove section and a second groove section, the first groove section and the second groove section are connected in sequence in the second direction, the first groove section extends to the outer surface of the main body in the second direction, the size of the first groove section in the first direction is larger than the size of the second groove section in the first direction, and the first groove section is used to accommodate at least a portion of the pole ear.

[0010] According to some embodiments of the present utility model, the main body includes a first pole segment group, a second pole segment group and a third pole segment group, the first pole segment group, the second pole segment group and the third pole segment group are stacked along a second direction, the first pole segment group and the second pole segment group each include at least one pole segment, the pole segment of the first pole segment group is provided with a first groove, the pole segment of the second pole segment group is provided with a second groove, the first groove defines the first groove segment, and the second groove defines the second groove segment.

[0011] According to some embodiments of the present utility model, the main body includes a first pole segment group, a second pole segment group and a third pole segment group, the first pole segment group, the second pole segment group and the third pole segment group are stacked along the second direction, the first pole segment group and the second pole segment group each include at least one pole segment, the size of the pole segment of the first pole segment group in the first direction is smaller than the size of the pole segment of the second pole segment group in the first direction, the size of the pole segment of the second pole segment group in the first direction is smaller than the size of the pole segment of the third pole segment group in the first direction, the first slot segment is defined between the pole segment of the first pole segment group and the pole segment of the second pole segment group, and the second slot segment is defined between the pole segment of the second pole segment group and the pole segment of the third pole segment group.

[0012] According to some embodiments of the utility model, the battery cell also includes a pole ear, at least part of the pole segment is connected to the pole ear on the pole ear side, the pole ear includes a first bending section, a second bending section and a third bending section, the first bending section is connected to the pole ear side of the pole segment, the first bending section extends along the second direction, one end of the second bending section is connected to the first bending section, the other end of the second bending section extends into the first slot section along the second direction, one end of the third bending section is connected to an end of the second bending section located in the first slot section, the other end of the third bending section extends toward the first bending section in the first direction and protrudes from the first bending section, and the third bending section is located on the side of the second bending section away from the first bending section in the second direction.

[0013] According to some embodiments of the utility model, the battery cell also includes a pole ear, the main body includes a plurality of pole segments stacked along the second direction, at least some of the pole segments are connected to the pole ear on the pole ear side, the pole ear is bent to form a bent portion, and at least a portion of the bent portion is accommodated in the accommodating groove.

[0014] According to some embodiments of the utility model, the bending portion includes a first bending section, a second bending section and a third bending section, the first bending section is connected to the pole ear side of the pole segment, the first bending section extends along the second direction, one end of the second bending section is connected to the first bending section, the other end of the second bending section extends into the accommodating groove along the second direction, one end of the third bending section is connected to one end of the second bending section located in the accommodating groove, the other end of the third bending section extends toward the first bending section in the first direction and protrudes from the first bending section, and the third bending section is located on the side of the second bending section away from the first bending section in the second direction.

[0015] According to some embodiments of the present invention, the pole tab includes a connecting portion, a transfer welding portion and an extension portion which are connected in sequence, the connecting portion connects the pole tab side of the pole segment, and the transfer welding portion is located in the second bending segment.

[0016] According to some embodiments of the present invention, the connecting portion has a set length L1, the transfer welding portion has a set length L2, the minimum dimension of the accommodating groove in the first direction is D1, the minimum dimension of the accommodating groove in the second direction is D2, and the main body has a set dimension W1 in the second direction, satisfying: D1≥L1-(W1-D2)+L2, L1≥W1-D2; and / or, the transfer welding portion has a set dimension H1 in the second direction, and the extension portion has a set dimension H2 in the second direction, satisfying, D2≥H1+H2.

[0017] According to some embodiments of the utility model, the main body includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are wound to form the main body, the first pole piece and the second pole piece respectively include a plurality of pole segments, and the pole segments of the first pole piece and the pole segments of the second pole piece are alternately arranged in the second direction; or, the first pole piece and the second pole piece are alternately stacked to form the main body, the first pole piece and the second pole piece both include the pole segments, and the pole segments of the first pole piece and the pole segments of the second pole piece are alternately arranged in the second direction.

[0018] A battery according to an embodiment of the utility model includes a battery cell in any of the above embodiments.

[0019] The battery according to the embodiment of the utility model has at least the following beneficial effects: by applying the battery cell according to the embodiment of the application, it is possible to ensure smooth assembly of the battery and ensure the energy density of the battery.

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

[0021] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 A schematic diagram of a battery cell according to an embodiment of the utility model;

[0023] Figure 2 for Figure 1 The enlarged schematic diagram of point a in the middle;

[0024] Figure 3 is a schematic diagram of a battery cell in an unbent state;

[0025] Figure 4 Schematic diagram of the battery cell after the first bending is completed;

[0026] Figure 5 Schematic diagram of the battery cell after the second bending is completed;

[0027] Figure 6 A schematic diagram of a battery cell formed by winding according to an embodiment of the utility model;

[0028] Figure 7 Schematic diagram of a battery cell formed by winding in other embodiments of the utility model;

[0029] Figure 8 A schematic diagram of a first pole piece and a second pole piece in an unfolded state of a wound battery cell according to an embodiment of the utility model;

[0030] Fig. 9 A schematic diagram of a battery core formed by stacking sheets according to an embodiment of the utility model;

[0031] Fig.10 Schematic diagram of a battery cell formed by stacking sheets in other embodiments of the utility model;

[0032] Fig.11 Schematic diagram of a battery cell formed by stacking sheets in other embodiments of the utility model;

[0033] Fig.12 Schematic diagram of a battery cell formed by stacking sheets in other embodiments of the utility model;

[0034] Fig.13 It is a cross-sectional view of a battery cell of some embodiments of the utility model;

[0035] Fig.14 are cross-sectional views of battery cells of other embodiments of the utility model;

[0036] Fig.15 are cross-sectional views of battery cells of other embodiments of the utility model;

[0037] Fig.16 are cross-sectional views of battery cells of other embodiments of the utility model;

[0038] Fig.17 for Fig.16 A top view of a battery cell in a second direction.

[0039] Reference numerals:

[0040] Main body 100, first pole piece 110, first sub-pole piece 111, second sub-pole piece 112, fifth sub-pole piece 113, second pole piece 120, third sub-pole piece 121, fourth sub-pole piece 122, sixth sub-pole piece 123, accommodating groove 130, first groove section 131, second groove section 132, first groove 133, second groove 134, pole ear group 140, sub-pole ear 141, pole segment 150, first pole segment group 160, second pole segment group 170, third pole segment group 180;

[0041] The electrode tab 200 , the connecting portion 210 , the transfer welding portion 220 , the extending portion 230 , the bending portion 240 , the first bending section 241 , the second bending section 242 , and the third bending section 243 . DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0045] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0046] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] In response to the problem in the related art that after the battery cell completes the folding operation, there is still a high probability that the pole ear will protrude from the end surface of the side of the battery cell body, the present application provides a receiving groove on the battery cell body, and the receiving groove provides space compensation to accommodate a part of the pole ear, thereby reducing the probability of the pole ear protruding from the end surface of the side of the battery cell body, thereby ensuring the subsequent assembly of the battery cell and the energy density.

[0048] The following describes the battery cell and battery of the embodiment of the present application with reference to the drawings of the specification. It should be noted that the first direction is shown in the left-right direction in the drawings, and the right side of the main body is shown as the pole ear side in the drawings. The second direction is shown in the up-down direction in the drawings, the upper side is the upper side, and the lower side is the lower side. The first direction and the second direction are intersecting directions, and the first direction and the second direction are shown to be perpendicular to each other in the drawings.

[0049] Reference Figure 1 and Figure 2According to an embodiment of the utility model, the battery cell includes a main body 100, at least one side of the main body 100 along the first direction has a pole ear side for arranging a pole ear 200, and a receiving groove 130 is formed on the pole ear side, and the receiving groove 130 extends to the outer surface of the main body 100 in the second direction, and the receiving groove 130 is used to accommodate at least a part of the pole ear 200. The receiving groove 130 provided on the main body 100 can provide an accommodating space for the pole ear 200 when the pole ear 200 is bent, so that a part of the pole ear 200 is located in the receiving groove 130, reducing the probability of the pole ear 200 protruding from the outer surface of the main body 100 in the second direction after the bending is completed, and ensuring the subsequent assembly and energy density of the battery cell.

[0050] Reference Figure 1 and Figure 2 The main body 100 includes a plurality of pole segments 150 stacked along the second direction, at least some of the pole segments 150 are provided with first grooves 133, and the first grooves 133 define the receiving grooves 130. The first grooves 133 of the pole segments 150 provided with the first grooves 133 are interconnected to jointly define the receiving grooves 130, and the number of the pole segments 150 provided with the first grooves 133 can be one, two, or more than two, which is specifically selected according to the size requirements of the receiving grooves 130 in the second direction.

[0051] For example, refer to Figure 6 , Figure 8 and Fig.13 In some embodiments, the main body 100 includes a first pole piece 110 and a second pole piece 120, the first pole piece 110 and the second pole piece 120 are wound to form the main body 100, so that the battery cell is prepared as a wound battery cell, the first pole piece 110 and the second pole piece 120 respectively include a plurality of pole segments 150, and the pole segments 150 of the first pole piece 110 and the pole segments 150 of the second pole piece 120 are alternately arranged in the second direction. In some embodiments, when the main body 100 is wound, the first pole piece 110 is located outside the second pole piece 120, and a first groove 133 is arranged on the right side of the pole segment 150 of the first pole piece 110, so that after the winding is completed, the first groove 133 defines the receiving groove 130. By controlling the position of the first groove 133 on the first pole piece 110, the first groove 133 can be located outside the main body 100 and define the receiving groove 130 after the winding is completed. It is understandable that the first pole piece 110 and the second pole piece 120 may be an anode piece and a cathode piece respectively, or the first pole piece 110 and the second pole piece 120 may be a cathode piece and an anode piece respectively. The pole segment 150 of the first pole piece 110 is a part of the first pole piece 110 , and the pole segment 150 of the second pole piece 120 is a part of the second pole piece 120 .

[0052] For example, refer to Figure 6 , Figure 8 and Fig.10 In other embodiments, when the main body 100 is wound, the first pole piece 110 is located outside the second pole piece 120, and the first groove 133 is provided on the right side of the pole segment 150 of the first pole piece 110, and the first groove 133 is provided on the right side of the pole segment 150 of the second pole piece 120. After the winding is completed, the first groove 133 of the first pole piece 110 and the first groove 133 of the second pole piece 120 are interconnected to jointly define the receiving groove 130. By providing the first groove 133 on both the wound first pole piece 110 and the second pole piece 120, and by controlling the position of the first groove 133 on the first pole piece 110 and the position of the first groove 133 on the second pole piece 120, the first groove 133 and the first groove 133 can be interconnected after the winding is completed, thereby defining the receiving groove 130 for accommodating a part of the pole lug 200. Among them, the first grooves 133 on the first pole piece 110 and the second pole piece 120 can be set to single or multiple to control the number of pole segments 150 having the first grooves 133, and then control the depth dimension of the accommodating groove 130 in the first direction by the first grooves 133 and the number of the first grooves 133.

[0053] Specifically, refer to Figure 8 The first pole piece 110 and the second pole piece 120 both have a set length, and the first pole piece 110 and the second pole piece 120 have a first side and a second side opposite to each other in the length direction. When the first pole piece 110 and the second pole piece 120 are wound around each other, the first sides of the first pole piece 110 and the second pole piece 120 are located on the inner side of the main body 100, and the second sides of the first pole piece 110 and the second pole piece 120 are located on the outer side of the main body 100. By arranging the first groove 133 and the second groove 134 on a side relatively close to the second side, the first groove 133 and the second groove 134 can be located on the outer side of the main body 100 and exposed after the winding is completed.

[0054] For example, refer to Figure 1 , Fig.13 and Fig.17In some embodiments, the main body 100 includes a first pole piece 110 and a second pole piece 120, and the first pole piece 110 and the second pole piece 120 are alternately stacked to form the main body 100, so that the battery cell is prepared as a laminated battery cell, and the first pole piece 110 and the second pole piece 120 both include pole segments 150, and the pole segments 150 of the first pole piece 110 and the pole segments 150 of the second pole piece 120 are alternately arranged in the second direction. When the main body 100 is stacked, the upper end of the main body 100 is the first pole piece 110. In some embodiments, the pole segment 150 of the first pole piece 110 located at the upper end is provided with a first groove 133, and the first groove 133 can define the accommodating groove 130. Among them, the pole segment 150 of the first pole piece 110 can be regarded as the whole structure of the first pole piece 110, or as a part of the first pole piece 110. The pole segment 150 of the second pole piece 120 can be regarded as the whole structure of the second pole piece 120, or as a part of the second pole piece 120.

[0055] For example, refer to Fig.13 and Fig.17 In other embodiments, a first groove 133 is provided on the right side of the pole segment 150 of at least one first pole piece 110 close to the upper side, and a first groove 133 is provided on the right side of the pole segment 150 of at least one second pole piece 120 close to the upper side, and the first grooves 133 are interconnected, and the first grooves 133 jointly define the accommodating groove 130. The number of the first pole piece 110 and the second pole piece 120 provided with the first groove 133 is not specifically limited, as long as the first grooves 133 are interconnected.

[0056] Reference Figure 1 , Figure 2 and Fig. 9 In some embodiments, the body 100 includes a first pole segment group 160 and a second pole segment group 170, the first pole segment group 160 and the second pole segment group 170 are stacked along the second direction, the first pole segment group 160 and the second pole segment group 170 each include at least one pole segment 150, the size of the pole segment 150 of the first pole segment group 160 in the first direction is smaller than the size of the pole segment 150 of the second pole segment group 170 in the first direction, and an accommodating groove 130 is defined between the pole segments 150 of the first pole segment group 160 and the pole segments 150 of the second pole segment group 170. The accommodating groove 130 can be defined by the difference between the pole segments 150 of the first pole segment group 160 and the second pole segment group 170.

[0057] For example, refer to Fig. 9In some embodiments, the size of the first pole piece 110 at the upper end portion in the first direction is smaller than the size of the adjacent second pole piece 120 in the first direction. The first pole piece 110 at the upper end portion is the first pole piece group 160, and the other first pole pieces 110 and second pole pieces 120 are the second pole piece group 170. The first pole piece 110 at the upper end portion and the adjacent second pole piece 120 define a receiving groove 130, and the receiving groove 130 is defined by the size difference between the adjacent first pole piece 110 and the second pole piece 120.

[0058] For example, refer to Fig.10 In other embodiments, the first pole piece 110 includes a first sub-pole piece 111 and a second sub-pole piece 112, the first sub-pole piece 111 is located on the upper side of the second sub-pole piece 112, and the size of the first sub-pole piece 111 in the first direction is smaller than the size of the second sub-pole piece 112 in the first direction. The second pole piece 120 includes a third sub-pole piece 121 and a fourth sub-pole piece 122, the third sub-pole piece 121 is located on the upper side of the fourth sub-pole piece 122, the size of the third sub-pole piece 121 in the first direction is smaller than the size of the fourth sub-pole piece 122 in the first direction, the first sub-pole piece 111 and the third sub-pole piece 121 are alternately arranged, the third sub-pole piece 121 and the fourth sub-pole piece 122 are alternately arranged, and the first sub-pole piece 111, the third sub-pole piece 121 and the second sub-pole piece 112, the fourth sub-pole piece 122 define a receiving groove 130 between them. The first sub-pole piece 111 and the second sub-pole piece 112 have a size difference, and the third sub-pole piece 121 and the fourth sub-pole piece 122 have a size difference, so that the first sub-pole piece 111, the third sub-pole piece 121, the second sub-pole piece 112 and the fourth sub-pole piece 122 define a receiving groove 130, and the depth of the receiving groove 130 in the second direction can be further controlled. Among them, the first sub-pole piece 111 and the third sub-pole piece 121 form a first pole piece group 160, and the second sub-pole piece 112 and the fourth sub-pole piece 122 form a second pole piece group 170.

[0059] As another improvement of the above solution, refer to Figure 2The receiving groove 130 includes a first groove section 131 and a second groove section 132, the first groove section 131 and the second groove section 132 are sequentially connected in the second direction, the first groove section 131 extends to the outer surface of the body 100 in the second direction, the first groove section 131 is located on the upper side of the second groove section 132, and the size of the first groove section 131 in the first direction is larger than the size of the second groove section 132 in the first direction. The receiving groove 130 is divided into a first groove section 131 and a second groove section 132 of different sizes, and the second groove section 132 can ensure space compensation in the second direction, so that the tab 200 can be accommodated in the receiving groove 130 as much as possible after bending. The first groove section 131 can extend the maximum size of the receiving groove 130 in the first direction to ensure space compensation of the receiving groove 130 in the first direction, so that the tab 200 can be accommodated in the receiving groove 130 as much as possible after bending, and the first groove section 131 can play a positioning function, so that the tab 200 is bent to the first direction in the reverse direction after bending to the first groove section 131.

[0060] Reference Fig.12 and Fig.17 In some embodiments, the main body 100 includes a first pole segment group 160, a second pole segment group 170 and a third pole segment group 180, which are stacked along the second direction. The first pole segment group 160 and the second pole segment group 170 each include at least one pole segment 150, and the pole segment 150 of the first pole segment group 160 is provided with a first groove 133, and the pole segment 150 of the second pole segment group 170 is provided with a second groove 134. The first groove 133 is provided on the pole segment 150 of the first pole segment group 160 to define a first groove section 131, and the second groove 134 is provided on the pole segment 150 of the second pole segment group 170 to define a second groove section 132, so as to form a stepped accommodating groove 130.

[0061] For example, refer to Figure 7 and Figure 8In the embodiment in which the main body 100 is formed by winding the first pole piece 110 and the second pole piece 120, a first groove 133 is provided on the right side of the pole segment 150 of the first pole piece 110, and a second groove 134 is provided on the right side of the pole segment 150 of the second pole piece 120. The size of the first groove 133 in the first direction is larger than the size of the second groove 134 in the first direction. The first groove 133 is connected to the second groove 134. When the winding is completed, the first pole piece 110 is wound around the outer side of the second pole piece 120 and is located at the upper side end. The pole segment 150 of the first pole piece 110 at the upper end has a first groove 133, the pole segment 150 of the first pole piece 110 at the upper end is the first pole segment group 160, the pole segment 150 of the second pole piece 120 at the upper end has a second groove 134, the pole segment 150 of the second pole piece 120 at the upper end is the second pole segment group 170, and the other pole segments 150 are the third pole segment group 180, the first groove 133 defines the first groove section 131, and the second groove 134 defines the second groove section 132. By respectively providing the first groove 133 and the second groove 134 with a size difference on the first pole piece 110 and the second pole piece 120, a receiving groove 130 with the first groove section 131 and the second groove section 132 can be defined after winding is completed.

[0062] For example, refer to Figure 7 and Figure 8In some other embodiments in which the main body 100 is formed by the first pole piece 110 and the second pole piece 120 being wound around each other, the first pole piece 110 and the second pole piece 120 both have a set length, and the first pole piece 110 and the second pole piece 120 have a first side and a second side opposite to each other in the length direction. When the first pole piece 110 and the second pole piece 120 are wound around each other, the first side of the first pole piece 110 and the second pole piece 120 are located on the inner side of the main body 100, and the second side of the first pole piece 110 and the second pole piece 120 are located on the outer side of the main body 100. The right side of the partial pole segment 150 of the first pole piece 110 and the right side of the partial pole segment 150 of the second pole piece 120 are both provided with a first groove 133 and a second groove 134, and the first groove 133 and the second groove 134 of each of the first pole piece 110 and the second pole piece 120 are arranged in a direction from the second side to the first side, and the size of the first groove 133 in the first direction is larger than the size of the second groove 134 in the first direction. The first groove 133 and the second groove 134 are interconnected, and each first groove 133 defines a first groove section 131, and each second groove 134 defines a second groove section 132. By setting a plurality of first grooves 133, the depth of the first groove section 131 in the second direction can be controlled by superimposing the sizes of the plurality of grooves. By setting the second groove 134, the depth of the second groove section 132 in the second direction can be controlled by superimposing the sizes of the plurality of grooves. Among them, the pole segment 150 provided with the first groove 133 of the first pole piece 110 and the pole segment 150 provided with the first groove 133 of the second pole piece 120 together constitute a first pole segment group 160, the pole segment 150 provided with the second groove 134 of the first pole piece 110 and the pole segment 150 provided with the second groove 134 of the second pole piece 120 together constitute a second pole segment group 170, and the other pole segments 150 constitute a third pole segment group 180.

[0063] For example, refer to Fig.14 and Fig.17 In some embodiments where the main body 100 is formed by alternately stacking the first pole piece 110 and the second pole piece 120, a first groove 133 is provided on the right side of the pole segment 150 of the first pole piece 110 at the upper end, and a second groove 134 is provided on the right side of the pole segment 150 of the second pole piece 120 at the upper end, and the size of the first groove 133 in the first direction is greater than the size of the second groove 134 in the first direction. By respectively providing the first groove 133 and the second groove 134 with a size difference on the first pole piece 110 and the second pole piece 120 at the upper end, a receiving groove 130 having a first groove segment 131 and a second groove segment 132 can be defined after the stacking is completed.

[0064] For example, refer to Fig.15 and Fig.17In some other embodiments where the main body 100 is formed by alternately stacking the first pole piece 110 and the second pole piece 120, the pole segments 150 of some of the first pole pieces 110 and the pole segments 150 of the second pole piece 120 are provided with first grooves 133 on the right side, and the first grooves 133 are connected to each other. The pole segments 150 provided with the first grooves 133 form a first pole segment group 160, and the first grooves 133 jointly define a first slot segment 131. The first pole piece 110 adjacent to the first pole segment group 160 is provided with a second groove 134 on the right side, and the first groove 133 is located on the upper side of the second groove 134. The size of the first groove 133 in the first direction is larger than the size of the second groove 134 in the first direction. The pole segments 150 provided with the second groove 134 form a second pole segment group 170, and the other pole segments 150 form a third pole segment group 180. The second groove 134 defines a second slot segment 132. The first groove 133 is provided to define the first groove section 131, and the depth of the first groove section 131 in the second direction can be controlled by controlling the number of the first pole pieces 110 provided with the first groove 133 and the second pole pieces 120 provided with the first groove 133. The second groove section 132 can be defined by the size difference between the second groove 134 and the first groove 133, thereby defining the accommodating groove 130 with steps.

[0065] For example, refer to Fig.16 and Fig.17 In other embodiments in which the main body 100 is formed by alternatingly stacking the first pole piece 110 and the second pole piece 120, a first groove 133 is provided on the right side of the pole segment 150 of some of the first pole pieces 110, a second groove 134 is provided on the right side of the pole segment 150 of some of the first pole pieces 110, a first groove 133 is provided on the right side of the pole segment 150 of some of the second pole pieces 120, and a second groove 134 is provided on the right side of the pole segment 150 of some of the second pole pieces 120, each first groove 133 is located on the upper side of each second groove 134, a size of the first groove 133 in the first direction is larger than a size of the second groove 134 in the first direction, the pole segments 150 provided with the first groove 133 constitute a first pole segment group 160, the pole segments 150 provided with the second groove 134 constitute a second pole segment group 170, and the other pole segments 150 constitute a third pole segment group 180. The first grooves 133 together define a first groove section 131, and the second grooves 134 together define a second groove section 132. The first groove section 131 can be defined by the arrangement of the first grooves 133, and the depth of the first groove section 131 in the second direction can be controlled by the number of the first grooves 133; the second groove section 132 can be defined by the arrangement of the second grooves 134, and the depth of the second groove section 132 in the second direction can be controlled by the number of the second grooves 134, so as to form an accommodating groove 130 having the first groove section 131 and the second groove section 132.

[0066] Reference Fig.12 In some embodiments, the main body 100 includes a first pole segment group 160, a second pole segment group 170 and a third pole segment group 180, which are stacked along the second direction. The first pole segment group 160 and the second pole segment group 170 each include at least one pole segment 150, the size of the pole segment 150 of the first pole segment group 160 in the first direction is smaller than the size of the pole segment 150 of the second pole segment group 170 in the first direction, the size of the pole segment 150 of the second pole segment group 170 in the first direction is smaller than the size of the pole segment 150 of the third pole segment group 180 in the first direction, a first slot segment 131 is defined between the pole segment 150 of the first pole segment group 160 and the pole segment 150 of the second pole segment group 170, and a second slot segment 132 is defined between the pole segment 150 of the second pole segment group 170 and the pole segment 150 of the third pole segment group 180. The first slot segment 131 can be defined by the size difference between the pole segments 150 of the first pole segment group 160 and the pole segments 150 of the second pole segment group 170 , and the second slot segment 132 can be defined by the size difference between the pole segments 150 of the second pole segment group 170 and the pole segments 150 of the third pole segment group 180 .

[0067] For example, refer to Figure 1 and Figure 2 In some other embodiments in which the main body 100 is formed by alternately stacking the first pole piece 110 and the second pole piece 120, the size of the first pole piece 110 at the upper end is smaller than the size of the adjacent second pole piece 120 in the first direction, the first pole piece 110 at the upper end constitutes a first pole segment group 160, the size of the second pole piece 120 at the upper end is smaller than the size of the adjacent first pole piece 110 at the lower side in the first direction, the second pole piece 120 at the upper end constitutes a second pole segment group 170, and the other pole segments 150 constitute a third pole segment group 180. A first slot segment 131 is defined between the first pole piece 110 at the upper end and the second pole piece 120 at the upper end, and a second slot segment 132 is defined between the second pole piece 120 at the upper end and the adjacent first pole piece 110 at the lower side. The first slot segment 131 can be defined by the size difference between the first pole piece 110 at the upper end and the second pole piece 120 at the upper end, and the second slot segment 132 can be defined by the size difference between the second pole piece 120 at the upper end and the first pole piece 110 adjacent to the lower side.

[0068] For example, refer to Fig.11In some other embodiments in which the main body 100 is formed by alternately stacking the first pole piece 110 and the second pole piece 120, the first pole piece 110 includes a first sub-pole piece 111 and a second sub-pole piece 112, the first sub-pole piece 111 is located on the upper side of the second sub-pole piece 112, and the size of the first sub-pole piece 111 in the first direction is smaller than the size of the second sub-pole piece 112 in the first direction. The second pole piece 120 includes a third sub-pole piece 121 and a fourth sub-pole piece 122, the third sub-pole piece 121 is located on the upper side of the fourth sub-pole piece 122, the size of the third sub-pole piece 121 in the first direction is smaller than the size of the fourth sub-pole piece 122 in the first direction, and the size of the third sub-pole piece 121 in the first direction is smaller than the size of the second sub-pole piece 112 in the first direction. The first sub-pole piece 111 and the third sub-pole piece 121 are arranged alternately, the second sub-pole piece 112 and the fourth sub-pole piece 122 are arranged alternately, the first sub-pole piece 111 and the third sub-pole piece 121 form a first pole piece group 160, the second sub-pole piece 112 forms a second pole piece group 170, and the fourth sub-pole piece 122 and other pole pieces form a third pole piece group 180. A first slot section 131 is defined between the first sub-pole piece 111, the third sub-pole piece 121 and the second sub-pole piece 112, and a second slot section 132 is defined between the second sub-pole piece 112 and the fourth sub-pole piece 122. The first slot section 131 is defined by the size difference between the first sub-pole piece 111, the third sub-pole piece 121 and the second sub-pole piece 112, and the depth of the first slot section 131 in the second direction can be further adjusted, and the second slot section 132 is defined by the size difference between the second sub-pole piece 112 and the fourth sub-pole piece 122.

[0069] For example, refer to Fig.12In other embodiments where the main body 100 is formed by alternately stacking a first pole piece 110 and a second pole piece 120, the first pole piece 110 includes a first sub-pole piece 111, a second sub-pole piece 112 and a fifth sub-pole piece 113, and the first sub-pole piece 111, the second sub-pole piece 112 and the fifth sub-pole piece 113 are arranged in sequence from the upper side to the lower side, and the size of the first sub-pole piece 111 in the first direction is smaller than the size of the second sub-pole piece 112 in the first direction, and the size of the second sub-pole piece 112 in the first direction is smaller than the size of the fifth sub-pole piece 113 in the first direction. The second pole piece 120 includes a third pole piece 121, a fourth pole piece 122 and a sixth pole piece 123, which are arranged in sequence from the upper side to the lower side, and the size of the third pole piece 121 in the first direction is smaller than the size of the fourth pole piece 122 in the first direction, and the size of the third pole piece 121 in the first direction is smaller than the size of the second pole piece 112 in the first direction, and the size of the fourth pole piece 122 in the first direction is smaller than the size of the sixth pole piece 123 in the first direction. The first pole piece 111 and the third pole piece 121 form a first pole piece group 160, the second pole piece 112 and the fourth pole piece 122 form a second pole piece group 170, and the fifth pole piece 113, the sixth pole piece 123 and other pole pieces form a third pole piece group 180. The first sub-pole piece 111 and the third sub-pole piece 121 are alternately arranged, the second sub-pole piece 112 and the fourth sub-pole piece 122 are alternately arranged, the fifth sub-pole piece 113 and the sixth sub-pole piece 123 are alternately arranged, the first sub-pole piece 111, the third sub-pole piece 121 and the second sub-pole piece 112 define a first slot section 131, and the second sub-pole piece 112, the fourth sub-pole piece 122 and the fifth sub-pole piece 113 define a second slot section 132. The first slot section 131 is defined by the size difference between the first sub-pole piece 111, the third sub-pole piece 121 and the second sub-pole piece 112, and the depth of the first slot section 131 in the second direction can be further adjusted. The second slot section 132 is defined by the size difference between the second sub-pole piece 112, the fourth sub-pole piece 122 and the fifth sub-pole piece 113, and the depth of the second slot section 132 in the second direction can be further adjusted.

[0070] Reference Figures 1 to 5 In some embodiments, the battery cell includes a tab 200, the main body 100 includes a plurality of tab segments 150 stacked along the second direction, at least some of the tab segments 150 are connected to the tab 200 on the tab side, the tab 200 is bent to form a bent portion 240, and at least a portion of the bent portion 240 is accommodated in the receiving groove 130. By providing the receiving groove 130, a portion of the tab 200 after being bent can be accommodated in the receiving groove 130, so as to reduce the protrusion of the bent portion 240 of the tab 200 from the outer surface of the main body 100 in the second direction.

[0071] Furthermore, the bending portion 240 includes a first bending section 241, a second bending section 242 and a third bending section 243, the first bending section 241 is connected to the pole ear side of the pole segment 150, the first bending section 241 extends along the second direction, one end of the second bending section 242 is connected to the second bending section 242, the other end of the second bending section 242 extends toward the second side in the first direction to the accommodating groove 130, one end of the third bending section 243 is connected to one end of the second bending section 242 located in the accommodating groove 130, the other end of the third bending section 243 extends toward the right side in the first direction and protrudes from the first bending section 241, and the third bending section 243 is located on the upper side of the second bending section 242. The three bendings of the tab 200 form the first bending section 241, the second bending section 242 and the third bending section 243 of the tab 200, so that the posture of the tab 200 can be adjusted, the space of the main body 100 in the second direction can be reasonably used for bending, and a part of the tab 200 is located in the receiving groove 130, reducing the probability of the tab 200 protruding from the end surface of the main body 100 in the second direction. The third bending section 243 protrudes from the right side of the main body 100 to facilitate the external connection of the tab 200.

[0072] It can be understood that the main body 100 is composed of a first pole piece 110 and a second pole piece 120, and a sub-pole ear 141 is connected to the right side of the first pole piece 110 or the second pole piece 120 for current extraction. Multiple sub-pole ears 141 are gathered into a pole ear group 140, and the pole ear group 140 constitutes a connecting portion 210. The first bending section 241 is formed by bending the connecting portion 210.

[0073] Reference Figure 1 and Figure 2 In an embodiment where the accommodating groove 130 includes a first groove section 131 and a second groove section 132, one end of the second bending section 242 is connected to the second bending section 242, and the other end of the second bending section 242 extends toward the second side in the first direction into the first groove section 131, so that the bending position is within the first groove section 131, and the space of the first groove section 131 in the first direction is reasonably utilized. The position of the first groove section 131 plays a positioning effect on the bending position, thereby improving standardization and ensuring the bending shape of the tab 200.

[0074] Reference Figures 1 to 3Further, the tab 200 includes a connecting portion 210, a transfer welding portion 220 and an extension portion 230 connected in sequence, the connecting portion 210 connects the tab side of the tab segment 150, the connecting portion 210 and the extension portion 230 are bent to form a first bending segment 241, a second bending segment 242 and a third bending segment 243, the transfer welding portion 220 is located on the second bending segment 242 to avoid bending to the transfer welding portion 220 and affecting the welding structure, and after folding, the transfer welding portion 220 and the extension portion 230 have a partial overlap and a large thickness, so that the welding portion is located in the second bending segment 242 and can make good use of the space of the accommodating groove 130. Among them, the connecting portion 210 includes the first bending segment 241 and the portion that is connected to the tab group 140, the extension portion 230 is a part of the adapter, and the transfer welding portion 220 is a part of the adapter and the connecting portion 210.

[0075] Reference Figure 3 In some embodiments, the connection portion 210 has a set length L1, the transfer soldering portion 220 has a set length L2, the minimum dimension of the receiving groove 130 in the first direction is D1, the minimum dimension of the receiving groove 130 in the second direction is D2, and the main body 100 has a set dimension W1 in the second direction, satisfying: D1≥L1-(W1-D2)+L2, L1≥W1-D2. Among them, the limitation of L1≥W1-D2 can ensure that the connection portion 210 has a sufficient length for bending operation, so that the transfer soldering portion 220 can be bent into the receiving groove 130. The limitation of D1≥L1-(W1-D2)+L2 can ensure that the receiving groove 130 has a sufficient dimension in the first direction to accommodate the transfer soldering portion 220, so as to reduce the probability that a part of the transfer soldering portion 220 cannot fall into the receiving groove 130 after the connection portion 210 is bent.

[0076] On the other hand, the transfer welding portion 220 has a set size H1 in the second direction, and the extension portion 230 has a set size H2 in the second direction, satisfying D2≥H1+H2. The definition of D2≥H1+H2 can ensure that the accommodating groove 130 has a sufficient size in the second direction to accommodate the transfer welding portion 220 and the extension portion 230, so as to reduce the probability that a part of the extension portion 230 protrudes in the second direction from the end surface of the main body 100 in the second direction after the extension portion 230 is bent.

[0077] Specific reference Figure 3 The connecting portion 210, the transfer welding portion 220 and the extending portion 230 are in a state of extending along the first direction when not bent. Figure 4 After the first bending, the connecting portion 210 is bent along the upper side of the second direction. Figure 5 After the second bending, the connecting portion 210 is further bent toward the left side of the first direction to form a first bending section 241. Figure 1 After the third bending, the extension portion 230 is further bent toward the right side of the first direction so that the extension portion 230 overlaps with the transfer welding portion 220 as much as possible, and defines a second bending section 242 and a third bending section 243.

[0078] Reference Figure 1 The battery according to the embodiment of the utility model includes the battery cell of any of the above embodiments. By using the battery cell of the embodiment of the application, the battery assembly can be smoothly carried out and the energy density of the battery can be ensured.

[0079] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery cell, characterized in that: include: The main body has a pole ear side for arranging the pole ear on at least one side along the first direction, and the pole ear side is formed with a receiving groove, which extends to the outer surface of the main body in the second direction, and the second direction intersects with the first direction, and the receiving groove is used to accommodate at least a part of the pole ear.

2. The battery cell according to claim 1, characterized in that: The main body includes a plurality of pole segments stacked along a second direction, at least some of the pole segments are provided with a first groove, and the first groove defines the accommodating groove.

3. The battery cell according to claim 1, characterized in that: The main body includes a first pole segment group and a second pole segment group, the first pole segment group and the second pole segment group are stacked along a second direction, the first pole segment group and the second pole segment group each include at least one pole segment, the size of the pole segment of the first pole segment group in the first direction is smaller than the size of the pole segment of the second pole segment group in the first direction, and the accommodating groove is defined between the pole segment of the first pole segment group and the pole segment of the second pole segment group.

4. The battery cell according to claim 1, characterized in that: The accommodating groove includes a first groove section and a second groove section, the first groove section and the second groove section are connected in sequence in the second direction, the first groove section extends to the outer surface of the main body in the second direction, the size of the first groove section in the first direction is larger than the size of the second groove section in the first direction, and the first groove section is used to accommodate at least a portion of the pole ear.

5. The battery cell according to claim 4, characterized in that: The main body includes a first pole segment group, a second pole segment group and a third pole segment group, the first pole segment group, the second pole segment group and the third pole segment group are stacked along a second direction, the first pole segment group and the second pole segment group each include at least one pole segment, the pole segment of the first pole segment group is provided with a first groove, the pole segment of the second pole segment group is provided with a second groove, the first groove defines the first groove section, and the second groove defines the second groove section.

6. The battery cell according to claim 4, characterized in that: The main body includes a first pole segment group, a second pole segment group and a third pole segment group, the first pole segment group, the second pole segment group and the third pole segment group are stacked along a second direction, the first pole segment group and the second pole segment group each include at least one pole segment, the size of the pole segment of the first pole segment group in the first direction is smaller than the size of the pole segment of the second pole segment group in the first direction, the size of the pole segment of the second pole segment group in the first direction is smaller than the size of the pole segment of the third pole segment group in the first direction, the first slot segment is defined between the pole segment of the first pole segment group and the pole segment of the second pole segment group, and the second slot segment is defined between the pole segment of the second pole segment group and the pole segment of the third pole segment group.

7. The battery cell according to claim 5 or 6, characterized in that: It also includes a pole ear, at least part of the pole segment is connected to the pole ear on the pole ear side, the pole ear includes a first bending segment, a second bending segment and a third bending segment, the first bending segment is connected to the pole ear side of the pole segment, the first bending segment extends along the second direction, one end of the second bending segment is connected to the first bending segment, the other end of the second bending segment extends into the first slot segment along the second direction, one end of the third bending segment is connected to an end of the second bending segment located in the first slot segment, the other end of the third bending segment extends toward the first bending segment in the first direction and protrudes from the first bending segment, and the third bending segment is located on the side of the second bending segment away from the first bending segment in the second direction.

8. The battery cell according to any one of claims 1 to 6, characterized in that: It also includes a pole ear, the main body includes a plurality of pole segments stacked along the second direction, at least some of the pole segments are connected to the pole ear on the pole ear side, the pole ear is bent to form a bent portion, and at least a portion of the bent portion is accommodated in the accommodating groove.

9. The battery cell according to claim 8, characterized in that: The bending portion includes a first bending section, a second bending section and a third bending section, the first bending section is connected to the pole ear side of the pole segment, the first bending section extends along the second direction, one end of the second bending section is connected to the first bending section, the other end of the second bending section extends into the accommodating groove along the second direction, one end of the third bending section is connected to one end of the second bending section located in the accommodating groove, the other end of the third bending section extends toward the first bending section in the first direction and protrudes from the first bending section, and the third bending section is located on the side of the second bending section away from the first bending section in the second direction.

10. The battery cell according to claim 9, characterized in that: The pole tab comprises a connecting portion, a transfer welding portion and an extending portion which are connected in sequence, the connecting portion is connected to the pole tab side of the pole segment, and the transfer welding portion is located in the second bending segment.

11. The battery cell according to claim 10, characterized in that: The connecting portion has a set length L1, the transfer welding portion has a set length L2, the minimum dimension of the accommodating groove in the first direction is D1, the minimum dimension of the accommodating groove in the second direction is D2, and the main body has a set dimension W1 in the second direction, satisfying: D1≥L1-(W1-D2)+L2, L1≥W1-D2; and / or, the transfer welding portion has a set dimension H1 in the second direction, and the extension portion has a set dimension H2 in the second direction, satisfying, D2≥H1+H2.

12. The battery cell according to any one of claims 1 to 6, characterized in that: The main body includes a first pole piece and a second pole piece, the first pole piece and the second pole piece are wound to form the main body, the first pole piece and the second pole piece respectively include a plurality of pole segments, the pole segments of the first pole piece and the pole segments of the second pole piece are alternately arranged in the second direction; or, the first pole piece and the second pole piece are alternately stacked to form the main body, the first pole piece and the second pole piece both include the pole segments, the pole segments of the first pole piece and the pole segments of the second pole piece are alternately arranged in the second direction.

13. A battery, characterized in that A battery cell comprising any one of claims 1 to 12.

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