Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery. The battery cell comprises a pole piece assembly, a tab assembly and a switching assembly. The tab assembly comprises a first tab connected with the first pole piece and a second tab connected with the second pole piece. The switching assembly comprises a first switching part, one end of the first switching part is connected with the first pole piece, the other end of the first switching part is arranged on the side, away from the second pole piece, of the first pole piece or the side, close to the second pole piece, of the first pole piece, and due to the arrangement of the first switching part, the distance between the first pole lug and the second pole lug can be kept unchanged when different types of battery cells are manufactured; the cutting dies of the first pole piece and the second pole piece can be kept unchanged. The first switching part is connected to the first pole piece, and the requirement for the distance between the battery cell and different tabs connected with the outside can be met by adjusting the length of the first switching part. According to the technical scheme provided by the invention, the development of slicing and cutting molds during manufacturing of different battery cell models is reduced, and the convenience of adjusting the distance between the tabs in the battery cell is improved.

Description

Technical Field

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

[0002] With the continuous development of secondary batteries, the application scope of batteries such as lithium-ion batteries continues to expand, and the models of batteries are becoming more and more diverse. The spacing between the cathode column and the anode column in different models of batteries will also be different. According to the different spacing between the cathode column and the anode column, in order to facilitate the connection of the pole ears and the pole columns in the battery cell, the spacing between the respective pole ears of the cathode sheet and the anode sheet will also be different. In the prior art, in order to form pole ears with different spacings, the pole ears are generally cut out at different positions of the cathode sheet and the anode sheet during the production process of the battery cell, so that the pole ears have different spacings after the cathode sheet and the anode sheet are stacked. In the prior art, the pole sheet is generally cut by a mold. When the position of the pole ear on the pole sheet changes, the mold for cutting the pole sheet also needs to be replaced. The development and replacement cost of the mold is high, which makes it extremely inconvenient to adjust the distance between the pole ears. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery cell and a battery, which can improve the convenience of adjusting the distance between the tabs.

[0004] To achieve the above-mentioned purpose, the utility model proposes a battery cell. The battery cell includes a pole piece assembly, a pole ear assembly and an adapter assembly. The pole piece assembly includes a first pole piece and a second pole piece, and the polarity of the first pole piece and the second pole piece are different. The pole ear assembly includes a first pole ear connected to the first pole piece and a second pole ear connected to the second pole piece. The adapter assembly includes a first adapter part, and one end of the first adapter part is connected to the first pole piece. The other end of the first adapter part is located on a side of the first pole piece away from the second pole piece, or, the other end of the first adapter part is located on a side of the first pole piece close to the second pole piece.

[0005] In some embodiments, the first pole tab is integrally formed on the first pole piece.

[0006] In some embodiments, the second pole tab is integrally formed on the second pole piece.

[0007] In some embodiments, the adapter assembly also includes a second adapter portion, one end of which is connected to the second pole piece; wherein the other end of the second adapter portion is located on a side of the second pole piece away from the first pole piece, or the other end of the second adapter portion is located on a side of the second pole piece close to the first pole piece.

[0008] In some embodiments, the first pole ear and the second pole ear are arranged at intervals along the first direction, the first adapter portion includes a first adapter plate extending along the first direction and a second adapter plate extending along the second direction, one end of the first adapter plate is connected to the first pole ear, and the other end is connected to the second adapter plate, and the first direction intersects with the second direction.

[0009] In some embodiments, a fillet is provided at a connection between the first adapter plate and the second adapter plate, and a radius r of the fillet satisfies: 0.1 mm≤r≤2 mm.

[0010] In some embodiments, the first direction and the second direction have a first angle α, and the first angle α satisfies: 70°≤α≤130°.

[0011] In some embodiments, the battery cell also includes a second adapter portion, one end of the second adapter portion is connected to the second pole ear, and the other end is arranged between the first pole ear and the second pole ear, the first adapter portion is arranged on the side of the first pole ear away from the second pole ear, the first pole ear and the second pole ear are arranged at intervals along the first direction, along the first direction, the side of the first adapter portion away from the second adapter portion and the side of the second adapter portion away from the first adapter portion have a first maximum distance a, the side of the first pole ear away from the second pole ear and the side of the second pole ear away from the first pole ear have a second maximum distance b, the first adapter portion has a first length c, the first pole ear has a second length d, the first maximum distance a, the second maximum distance b, the first length c and the second length d satisfy: ba≤c≤b-a+d.

[0012] In some embodiments, the battery cell further includes a diaphragm, and along the thickness direction of the first pole ear, the diaphragm has a first thickness e, and the burr of the first transition portion has a first height f, and the first thickness e and the first height f satisfy: e≥2f.

[0013] In some embodiments, the battery cell further includes a protective layer, which is adhered to and covers the first transfer portion.

[0014] A second aspect of the present application further provides a battery, which includes a battery cell according to any of the above embodiments.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] In the technical solution of the present application, one end of the first adapter is connected to the first pole piece, and the other end is arranged on the side of the first pole piece away from the second pole piece or the side of the first pole piece close to the second pole piece. The arrangement of the first adapter allows the spacing between the first pole lug and the second pole lug to remain unchanged when manufacturing different types of battery cells, and the cutting molds of the first pole piece and the second pole piece can remain unchanged. The first adapter is connected to the first pole piece, and the length of the first adapter can be adjusted to meet the requirements of different pole lug spacings between the battery cell and the external connection. The technical solution of the present application reduces the development of slicing and cutting molds when manufacturing different types of battery cells, improves the convenience of adjusting the distance between the pole lugs, and greatly improves the convenience of manufacturing different types of battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the battery cell in the first embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the battery cell in the second embodiment of the utility model;

[0020] Figure 3 The schematic diagram of the structure of the battery cell in the third embodiment of the utility model shows a first pole piece, a diaphragm and a second pole piece in a stacked arrangement;

[0021] Figure 4 This is a schematic diagram of the structure of the battery cell in the fourth embodiment of the utility model, wherein the figure shows a possible pasting position of the protective layer;

[0022] Figure 5 This is a schematic diagram of the structure of a battery cell in the fifth embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the structure of a battery cell in a sixth embodiment of the present utility model;

[0024] Figure 7 It is a structural schematic diagram of the burr height on the first adapter part and the diaphragm thickness in one embodiment of the utility model.

[0025] Description of Figure Numbers:

[0026] Battery cell 100;

[0027] Pole piece assembly 110; first pole piece 111; second pole piece 112;

[0028] Tab assembly 120; first tab 121; second tab 122;

[0029] Adapter assembly 130; first adapter portion 131; first adapter plate 1311; second adapter plate 1312; second adapter portion 132;

[0030] Diaphragm 140;

[0031] A protective layer 150;

[0032] first direction X; second direction Y; first maximum distance a; second maximum distance b; first length c; second length d; first thickness e; first height f; radius r; first angle α.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] With the continuous development of secondary batteries, the application scope of batteries such as lithium-ion batteries continues to expand, and the models of batteries are becoming more and more diverse. The spacing between the cathode column and the anode column in different models of batteries will also be different. According to the different spacing between the cathode column and the anode column, in order to facilitate the connection of the pole ears and the pole columns in the battery cell, the spacing between the respective pole ears of the cathode sheet and the anode sheet will also be different. In the prior art, in order to form pole ears with different spacings, the pole ears are generally cut out at different positions of the cathode sheet and the anode sheet during the production of the battery cell, so that the pole ears have different spacings after the cathode sheet and the anode sheet are stacked. In the prior art, the pole sheet is generally cut by a mold. When the position of the pole ear on the pole sheet changes, the mold for cutting the pole sheet also needs to be replaced. The development and replacement cycle of the mold is long and the cost is high, which makes it extremely inconvenient to adjust the distance between the pole ears.

[0036] To solve the above technical problems, Figures 1 to 7 As shown, the present application proposes a battery cell 100 . The battery cell 100 includes a pole piece assembly 110 , a pole tab assembly 120 and a transition assembly 130 .

[0037] like Figure 1As shown, the pole piece assembly 110 includes a first pole piece 111 and a second pole piece 112. The first pole piece 111 and the second pole piece 112 have different polarities. In the battery cell 100, the first pole piece 111 and the second pole piece 112 can be stacked.

[0038] like Figure 2 as well as Figure 3 As shown, the tab assembly 120 includes a first tab 121 connected to the first pole piece 111 and a second tab 122 connected to the second pole piece 112. The battery cell 100 may have a first pole piece 111 and a second pole piece 112 stacked in multiple layers. Similarly, the tab assembly 120 may include a plurality of first tabs 121 and a second tab 122 arranged corresponding to the pole pieces. A plurality of first tabs 121 may be connected to each other to form an external tab, and a plurality of second tabs 122 may also be connected to each other to form another external tab. The two external tabs are arranged at intervals along the first direction X, wherein a first adapter 131 may be provided on one or more first tabs 121.

[0039] like Figure 1 As shown, the adapter assembly 130 includes a first adapter portion 131, and one end of the first adapter portion 131 is connected to the first pole piece 111. The first adapter portion 131 can be connected to the first pole piece 111 by any suitable method such as welding. The adapter assembly 130 is used to achieve external electrical connection with the pole ear. Among them, the other end of the first adapter portion 131 is located on the side of the first pole piece 111 away from the second pole piece 112, or the other end of the first adapter portion 131 is located on the side of the first pole piece 111 close to the second pole piece 112. In other words, the end of the first adapter portion 131 away from the first pole piece 111 can be arranged on the outside of the first pole piece 111 and the second pole piece 112, or it can be arranged between the first pole piece 111 and the second pole piece 112. The outside can be electrically connected to the first pole ear 121 through the first adapter 131, and the outside is electrically connected to the second pole ear 122. When the other end of the first adapter 131 is arranged on the side of the first pole piece 111 away from the second pole piece 112, the distance between the positive and negative poles of the battery cell 100 and the external connection increases; when the other end of the first adapter 131 is arranged between the first pole piece 111 and the second pole piece 112, the distance between the positive and negative poles of the battery cell 100 and the external connection decreases; when the other end of the first adapter 131 is arranged on the side of the first pole piece 111 close to the second pole piece 112, and the first connection end extends to the side of the second pole piece 112 away from the first pole piece 111, the battery cell 100 can be provided with the second pole ear 122 according to different usage requirements, so that the battery cell 100 can adapt to more connection requirements. It can be understood that the battery cell 100 of the present application can also be used for special-shaped batteries, which will not be repeated here.

[0040] In the technical solution of the present application, one end of the first adapter 131 is connected to the first pole piece 111, and the other end is arranged on the side of the first pole piece 111 away from the second pole piece 112 or the side of the first pole piece 111 close to the second pole piece 112. The arrangement of the first adapter 131 allows the spacing between the first pole piece 121 and the second pole piece 122 to remain unchanged when manufacturing different types of battery cells 100, and the cutting molds of the first pole piece 111 and the second pole piece 112 can remain unchanged. The first adapter 131 is connected to the first pole piece 111, and the length of the first adapter 131 can be adjusted to meet the requirements of different pole piece spacings between the battery cell 100 and the external connection. The technical solution of the present application improves the convenience of adjusting the pole piece spacing, and greatly improves the convenience of manufacturing different types of battery cells 100.

[0041] In some embodiments, in order to improve the connection strength between the tab assembly 120 and the pole piece assembly 110 and improve the processing efficiency of the tab assembly 120 and the pole piece assembly 110, the tab assembly 120 can be integrally formed with the pole piece assembly 110. Figure 3 As shown, in this embodiment, the first pole ear 121 can be integrally formed on the first pole piece 111, and the second pole ear 122 can also be integrally formed on the second pole piece 112. Specifically, the current collector that is not coated with the active layer on the pole piece can be cut to form a pole ear on the pole piece, and the current collector coated with the active layer can also be cut, and then the active layer on the current collector is removed to obtain the pole ear, which is not limited here. The use of the adapter assembly 130 allows different models of battery cells 100 to use the same set of pole piece cutting molds, which reduces the development of slicing and cutting molds when manufacturing different models of battery cells 100, saving the manufacturing cost of the battery cells 100.

[0042] The adapter assembly 130 may include a first adapter portion 131 and a second adapter portion 132. The first adapter portion 131 is provided so that the battery cell 100 can better adapt to the connection with the outside, and the second adapter portion 132 may be provided differently according to different usage requirements. Figure 1 As shown, the second transition portion 132 can extend along the extension direction of the original second electrode tab 122, such as Figure 2 as well as Figure 3As shown, in some embodiments, in order to further improve the convenience of adjusting the distance between the battery cell 100 and the external connection point, the adapter assembly 130 may also include a second adapter portion 132, and the second adapter portion 132 is used to connect to the second pole ear 122, and the distance between the second adapter portion 132 and the first adapter portion 131 is adjusted to adjust the port distance between the battery cell 100 and the external electrical connection. In this embodiment, the adapter assembly 130 also includes a second adapter portion 132, and one end of the second adapter portion 132 is connected to the second pole piece 112; wherein the other end of the second adapter portion is located on a side of the second pole piece 112 away from the first pole piece 111, or the other end of the second adapter portion 132 is located on a side of the second pole piece 112 close to the first pole piece 111. That is to say, Figure 2 As shown, the end of the second transition portion 132 away from the second pole piece 112 can be arranged between the first pole piece 111 and the second pole piece 112. Figure 3 As shown, one end of the second transition portion 132 away from the second pole piece 112 may be disposed on a side of the second pole piece 112 away from the first pole piece 111 .

[0043] The shape of the first adapter portion 131 may vary according to different usage requirements. When projected along the thickness direction of the first pole piece 111, the projection of the first adapter portion 131 on the projection plane may be a rectangle, a semicircle, or any other suitable shape. Figure 4 The first adapter portion 131 may be composed of a single adapter sheet, such as Figure 6 The first adapter portion 131 may also be composed of a plurality of adapter plates. In this embodiment, the first pole ear 121 and the second pole ear 122 are arranged at intervals along the first direction X, and the first adapter portion 131 includes a first adapter plate 1311 extending along the first direction X and a second adapter plate 1312 extending along the second direction Y. One end of the first adapter plate 1311 is connected to the first pole ear 121, and the other end is connected to the second adapter plate 1312. The first direction X intersects with the second direction Y. The specific first adapter plate 1311 and the second adapter plate 1312 may be a rectangular adapter plate or a semi-annular adapter plate, which is not limited here.

[0044] In some embodiments, in order to reduce the possible adverse effects on the performance of the battery cell 100 caused by the sharpness of the connection points of the adapter sheets, the connection points of the adapter sheets may be rounded. Figure 3As shown, in the present embodiment, a fillet is provided at the connection between the first adapter plate 1311 and the second adapter plate 1312, and the radius r of the fillet satisfies: 0.1mm≤r≤2mm. Specifically, the radius r of the fillet can be any suitable value such as 0.1mm, 0.2mm, 1mm, 1.5mm or 2mm. The first adapter plate 1311 and the second adapter plate 1312 can also be made by an integral molding method, that is, the first adapter portion 131 can be cut first, and then the first adapter portion 131 is rounded. The first adapter plate 1311 can also be connected to the second adapter plate 1312 by welding, which is not limited here.

[0045] In some embodiments, the direction of the first adapter plate 1311 and the extension square of the second adapter plate 1312 may be different according to different usage requirements. Figure 5 as well as Figure 6 As shown, in this embodiment, the first direction X and the second direction Y have a first angle α, and the first angle α satisfies: 70°≤α≤130°. Specifically, the angle between the first direction X and the second direction Y can be any suitable angle such as 70°, 80°, 85°, 90°, 110° or 130°. Specifically, if the first adapter 1311 extends along the first direction X to the side where the first pole ear 121 is surrounded by the second pole ear 122, the extension direction of the second adapter 1312 can be at any suitable angle to the extension direction of the first adapter 1311. It should be noted that when the first angle α is 70°, the end of the first adapter 131 away from the first pole ear 121 can be provided with a side of the first pole ear 121 away from the second pole ear 122, or can be provided between the first pole ear 121 and the second pole ear 122, which is not limited here.

[0046] The cutting length of the first adapter portion 131 can be different according to different usage requirements. Figure 1 as well as Figure 2In the present embodiment, the battery cell 100 further includes a second adapter portion 132, one end of the second adapter portion 132 is connected to the second pole ear 122, and the other end is arranged between the first pole ear 121 and the second pole ear 122, the first adapter portion 131 is arranged on the side of the first pole ear 121 away from the second pole ear 122, the first pole ear 121 and the second pole ear 122 are arranged at intervals along the first direction X, along the first direction X, the side of the first adapter portion 131 away from the second adapter portion 132 and the side of the second adapter portion 132 away from the first adapter portion 131 have a first maximum distance a, the side of the first pole ear 121 away from the second pole ear 122 and the side of the second pole ear 122 away from the first pole ear 121 have a second maximum distance b, the first adapter portion 131 has a first length c, the first pole ear 121 has a second length d, the first maximum distance a, the second maximum distance b, the first length c and the second length d satisfy: ba≤c≤b-a+d. It can be understood that the projection of the other end of the second adapter portion 132 along the second direction can overlap with the second pole lug 122, while the projection of the end of the first adapter portion 131 away from the first pole lug 121 along the second direction at least partially does not overlap with the first pole lug 121. The second maximum distance b is the spacing between the connection points where the battery cell 100 needs to be connected to the outside. The first length c of the first adapter portion 131 refers to the longest dimension of the first adapter portion 131 along the first direction X, that is, the distance from the side of the first adapter portion 131 close to the second pole lug 122 to the side away from the second pole lug 122. The second length d of the first pole lug 121 refers to the longest dimension of the first pole lug 121 along the first direction X, that is, the distance from the side of the first pole lug 121 close to the second pole lug 122 to the side away from the second pole lug 122. The first maximum distance a, the second maximum distance b, the first length c and the second length d satisfy: ba≤c≤b-a+d, that is, when the side of the first transition portion 131 close to the second pole lug 122 coincides with the side of the first pole lug 121 away from the second pole lug 122, the length of the first transition portion 131 in the first direction X satisfies ba. When the side of the first transition portion 131 close to the second pole lug 122 coincides with the side of the first pole lug 121 close to the second pole lug 122, the length of the first transition portion 131 in the first direction X satisfies b-a+d. When the side of the first transition portion 131 close to the second pole lug 122 is provided between the side of the first pole lug 121 close to the second pole lug 122 and the side of the first pole lug 121 away from the second pole lug 122, the length of the first transition portion 131 in the first direction X satisfies and can be provided between ba and b-a+d. The first adapter portion 131 can be welded to the first pole tab 121, and similarly, the second adapter portion 132 can also be welded to the second pole tab 122, which is not limited here. It can be understood that when the first adapter portion 131 is arranged on the side of the first pole tab 121 close to the second pole tab 122, the cutting lengths of the first adapter portion 131 and the second adapter portion 132 can be different according to the specific setting method.

[0047] like Figure 3 as well as Figure 7 As shown, in the battery cell 100, in order to avoid the short circuit of the battery cell 100 caused by the direct contact between the first pole piece 111 and the second pole piece 112, a diaphragm 140 is also provided in the battery cell 100. The diaphragm 140 is provided between the first pole piece 111 and the second pole piece 112. In some embodiments, the first transition portion 131 is obtained by cutting. Since a certain amount of burrs will be generated by cutting, the burrs may pierce the diaphragm 140 and cause the battery cell 100 to short-circuit. In order to reduce the risk of burrs piercing the diaphragm 140, in this embodiment, the battery cell 100 also includes a diaphragm 140. Along the thickness direction of the first pole ear 121, the diaphragm 140 has a first thickness e, and the burrs of the first transition portion 131 have a first height f. The first thickness e and the first height f satisfy: e≥2f. Specifically, the first thickness e can be. 2 times, 2.5 times, 2.7 times or 3 times the first height f. In other words, the height of the burr is not higher than 1 / 2 of the thickness of the diaphragm 140. It should be noted that when the first adapter portion 131 has multiple burrs, the first height f of the burrs is the maximum height of all the burrs. The first height f of the burrs can be controlled at 1 / 2, 1 / 3 or 1 / 4 or a smaller value of the first thickness e of the diaphragm 140, and there is no limitation here.

[0048] In some embodiments, the battery cell 100 may further include a protective layer 150, which may cover the first adapter portion 131, the second adapter portion 132, the first pole tab 121, and the second pole tab 122. The first adapter portion 131, the second adapter portion 132, the first pole tab 121, and the second pole tab 122 may be obtained by cutting, and burrs are easily generated during the cutting process. In order to further reduce the risk of burrs piercing the diaphragm 140, the protective layer 150 may be attached to reduce the risk of burrs contacting the diaphragm 140. Figure 4 As shown, in this embodiment, the battery cell 100 also includes a protective layer 150, which is pasted and covered on the first transition part 131. It is understandable that the coverage area and position of the protective layer 150 on the first transition part 131 can be different according to different usage requirements. Specifically, the protective layer 150 can be adhesive tape. The protective layer 150 is pasted on the first transition part 131, which can not only reduce the risk of burrs damaging the diaphragm 140, but also improve the connection stability between the first transition part 131 and the first pole ear 121, and improve the stability of the first transition part 131 on the battery cell 100. Similarly, the first pole ear 121, the second pole ear 122 and the second transition part 132 can also be attached with corresponding protective layers 150, which will not be repeated here. It should be noted that in some embodiments, in order to improve the stability of the connection between the first transition part 131 and other components of the battery cell 100, the protective layer 150 can also be attached to the end of the first transition part 131 away from the first pole piece 111, which is not limited here.

[0049] The second aspect of the present application also provides a battery (not shown in the figure), which includes the battery cell 100 of any of the above embodiments. Thanks to the improvement of the above battery cell 100, the battery of this embodiment has the same technical effect as the above battery cell 100, which will not be repeated here. It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the utility model, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0051] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A pole piece assembly, comprising a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece have different polarities; A pole lug assembly, comprising a first pole lug connected to the first pole piece and a second pole lug connected to the second pole piece; The adapter assembly includes a first adapter part, one end of which is connected to the first pole piece, and the other end of which is located on a side of the first pole piece away from the second pole piece, or the other end of which is located on a side of the first pole piece close to the second pole piece.

2. The battery cell according to claim 1, characterized in that: The first pole ear is integrally formed on the first pole piece; and / or, The second pole ear is integrally formed on the second pole piece.

3. The battery cell according to claim 1, characterized in that: The adapter assembly also includes a second adapter portion, one end of which is connected to the second pole piece; wherein the other end of the second adapter portion is located on a side of the second pole piece away from the first pole piece, or the other end of the second adapter portion is located on a side of the second pole piece close to the first pole piece.

4. The battery cell according to claim 1, characterized in that: The first pole ear and the second pole ear are arranged at intervals along a first direction, the first adapter portion includes a first adapter plate extending along the first direction and a second adapter plate extending along the second direction, one end of the first adapter plate is connected to the first pole ear, and the other end is connected to the second adapter plate, and the first direction intersects with the second direction.

5. The battery cell according to claim 4, characterized in that: A fillet is provided at a connection point between the first adapter plate and the second adapter plate, and a radius r of the fillet satisfies: 0.1 mm≤r≤2 mm.

6. The battery cell according to claim 4, characterized in that: The first direction and the second direction have a first angle α, and the first angle α satisfies: 70°≤α≤130°.

7. The battery cell according to claim 1, characterized in that: The battery cell also includes a second adapter portion, one end of the second adapter portion is connected to the second pole ear, and the other end is arranged between the first pole ear and the second pole ear, the first adapter portion is arranged on the side of the first pole ear away from the second pole ear, the first pole ear and the second pole ear are arranged at intervals along a first direction, along the first direction, the side of the first adapter portion away from the second adapter portion and the side of the second adapter portion away from the first adapter portion have a first maximum distance a, the side of the first pole ear away from the second pole ear and the side of the second pole ear away from the first pole ear have a second maximum distance b, the first adapter portion has a first length c, the first pole ear has a second length d, the first maximum distance a, the second maximum distance b, the first length c and the second length d satisfy: ba≤c≤b-a+d.

8. The battery cell according to claim 1, characterized in that: The battery cell further includes a diaphragm. Along the thickness direction of the first pole ear, the diaphragm has a first thickness e. The burr of the first transition portion has a first height f. The first thickness e and the first height f satisfy: e≥2f.

9. The battery cell according to claim 1, characterized in that: The battery core further includes a protective layer, and the protective layer is adhered to and covers the first transfer portion.

10. A battery, characterized in that: A battery cell comprising the battery cell described in any one of claims 1 to 9.

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