Laminated battery cell

Abstract

The utility model discloses a laminated cell. The laminated cell comprises a cell main body, a first pole piece and a second pole piece, the battery cell main body comprises a first pole piece and a second pole piece which are sequentially and alternately overlapped along the thickness direction, and a diaphragm is arranged between the first pole piece and the second pole piece; the first tab comprises a first pole connecting piece part and a first pole leading-out piece part, the first pole connecting piece part is parallel to the thickness direction of the battery cell main body and is connected with all the first pole pieces, and the first pole leading-out piece part is connected with the first pole connecting piece part; the second tab comprises a second pole connecting piece part and a second pole leading-out piece part, the second pole connecting piece part is parallel to the thickness direction of the battery cell main body and is connected with all the second pole pieces, and the second pole leading-out piece part is connected with the second pole connecting piece part; the second pole connecting sheet part and the first pole connecting sheet part are insulated from each other, and the first pole leading-out sheet part and the second pole leading-out sheet part are positioned at the same end of the battery cell main body along the length direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a lamination type electric core. BACKGROUND

[0002] Folding screen mobile phone needs to use the ultra -thin battery, the existing ultra -thin battery includes the casing and lamination type electric core, because lamination type electric core thickness is thin, therefore usually adopts the way of pole lug direct connection pole lug, that is, pole piece connects pole lug through foil pole lug part, and foil pole lug part and pole lug are parallel to the length direction of pole piece, the size space of positive pole lug and negative pole lug of this structure to the length direction of battery occupies more, influence battery's energy density. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art is solved, for this, the utility model provides a lamination type electric core, can reduce the size occupation of first pole lug and second pole lug to the length direction of battery, improves the energy density of battery.

[0004] According to the lamination type electric core of the utility model embodiment, including electric core main part, first pole piece and second pole piece, electric core main part includes first pole piece and second pole piece alternately in sequence along the thickness direction, and diaphragm is arranged between first pole piece and second pole piece, first pole lug includes first pole connecting piece part and first pole lead-out piece part, first pole connecting piece part is parallel to the thickness direction of electric core main part, first pole connecting piece part is connected with all first pole piece, and first pole lead-out piece part is connected with first pole connecting piece part, second pole lug includes second pole connecting piece part and second pole lead-out piece part, second pole connecting piece part is parallel to the thickness direction of electric core main part, second pole connecting piece part is connected with all second pole piece, and second pole lead-out piece part is connected with second pole connecting piece part, second pole connecting piece part and first pole connecting piece part are mutually insulated, and first pole lead-out piece part and second pole lead-out piece part are located at the same end of electric core main part along the length direction.

[0005] According to the lamination type electric core of the utility model embodiment, at least has following beneficial effect: first pole connecting piece part and first pole piece are connected through the first pole connecting piece part of first pole lug, and first pole connecting piece part is parallel to the thickness direction of electric core main part, and second pole connecting piece part and second pole piece are connected through the second pole connecting piece part of second pole lug, and second pole connecting piece part is parallel to the thickness direction of electric core main part, so that first pole connecting piece part and second pole connecting piece part do not occupy the size of length direction basically, so that the size of first pole lug and second pole lug to the length direction of battery reduces, under the condition that the length size of battery is invariable, the length of electric core main part can be made greater, thereby improving the energy density of battery.

[0006] According to some embodiments of the present application, the first pole connecting piece part and the second pole connecting piece part are arranged around the circumference of the battery core body and form a frame-shaped structure, and a first insulating piece is arranged between the end of the first pole connecting piece part and the end of the second pole connecting piece part.

[0007] According to some embodiments of the present application, the width of the first insulating piece is A, the width of the battery core body is B, and 2mm≤A≤B-20mm is satisfied.

[0008] According to some embodiments of the present application, the first pole lead-out piece part is parallel to the length direction of the battery core body, the first pole lead-out piece part and the first pole connecting piece part are an integral structure, the second pole lead-out piece part is parallel to the length direction of the battery core body, and the second pole lead-out piece part and the second pole connecting piece part are an integral structure.

[0009] According to some embodiments of the present application, the first pole piece is provided with a foil tab part, the foil tab part protrudes relative to the outer peripheral wall of the first pole piece, the foil tab part is welded and connected with the first pole connecting piece part, and the second pole connecting piece part is welded and connected with the outer peripheral wall of all the second pole pieces.

[0010] According to some embodiments of the present application, the cross section of the battery core body perpendicular to the thickness direction is rectangular, the outer periphery of the battery core body has four side walls, the first pole connecting piece part is opposite to one of the side walls, and the second pole connecting piece part is opposite to at least three of the side walls.

[0011] According to some embodiments of the present application, the second pole piece comprises a second pole current collector, and the second pole current collector is a foamed copper sheet.

[0012] According to some embodiments of the present application, a second insulating piece is arranged between the second pole piece and the first pole connecting piece part.

[0013] According to some embodiments of the present application, the size of the first pole connecting piece part and the second pole connecting piece part along the thickness direction of the battery core body is the same, the size of the first pole connecting piece part along the thickness direction of the battery core body is C, the thickness of the battery core body is D, and 0.1mm≤C≤1.15D is satisfied.

[0014] According to some embodiments of the present application, the battery core body comprises two first pole pieces and one second pole piece, the thickness of the first pole piece is E, and 0.5×(D-2E)≤C≤D-2E is satisfied.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Fig. 1 This is a three-dimensional schematic diagram of a stacked battery cell according to an embodiment of the present utility model;

[0018] Fig. 2 This is a three-dimensional schematic diagram of the first electrode, the second electrode, and the first insulating member according to an embodiment of the present utility model;

[0019] Fig. 3 This is a cross-sectional schematic diagram of the main body of the battery cell according to an embodiment of the present utility model.

[0020] Figure label:

[0021] The battery cell body is 100, the first electrode is 110, the foil electrode tab is 111, the first current collector is 112, the second electrode is 120, and the separator is 130.

[0022] First electrode tab 200, first electrode connecting plate 210, first electrode lead-out plate 220;

[0023] Second electrode tab 300, second electrode connecting plate 310, second electrode lead-out plate 320;

[0024] First insulating component 400;

[0025] Second insulating component 500. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of the utility model, more refers to two or more. If it is described to first, second, it is only used for distinguishing technical features for the purpose, and can not be understood as indicating or suggesting relative importance or implicitly indicating the quantity of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0029] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be broadly understood, and the specific meaning of the above words in the utility model can be reasonably determined by the person skilled in the art in combination with the specific content of technical scheme.

[0030] Refer to Figs. 1 to 3 For the laminated cell of the utility model embodiment, it comprises cell main body 100, first tab 200 and second tab 300. The cell main body 100 comprises first pole piece 110 and second pole piece 120 that are alternately stacked in sequence along the thickness direction, and diaphragm 130 is arranged between the first pole piece 110 and the second pole piece 120. The first tab 200 comprises first pole connecting sheet part 210 and first pole lead-out sheet part 220, the first pole connecting sheet part 210 is parallel to the thickness direction of the cell main body 100, the first pole connecting sheet part 210 is connected with all first pole pieces 110, and the first pole lead-out sheet part 220 is connected with the first pole connecting sheet part 210. The second tab 300 comprises second pole connecting sheet part 310 and second pole lead-out sheet part 320, the second pole connecting sheet part 310 is parallel to the thickness direction of the cell main body 100, the second pole connecting sheet part 310 is connected with all second pole pieces 120, and the second pole lead-out sheet part 320 is connected with the second pole connecting sheet part 310. The second pole connecting sheet part 310 and the first pole connecting sheet part 210 are mutually insulated, and the first pole lead-out sheet part 220 and the second pole lead-out sheet part 320 are located at the same end of the cell main body 100 along the length direction.

[0031] The first pole connecting sheet part 210 of the first tab 200 is connected with the first pole piece 110, and the first pole connecting sheet part 210 is parallel to the thickness direction of the cell main body 100, the second pole connecting sheet part 310 of the second tab 300 is connected with the second pole piece 120, and the second pole connecting sheet part 310 is parallel to the thickness direction of the cell main body 100, so that the first pole connecting sheet part 210 and the second pole connecting sheet part 310 basically do not occupy the size along the length direction, thereby the size of the first tab 200 and the second tab 300 along the length direction of the battery is reduced, in the case that the length size of the battery is unchanged, the length of the cell main body 100 can be made larger, thereby improving the energy density of the battery.

[0032] Specifically, the first pole piece 110 is a positive pole piece, the first pole lug 200 is a positive pole lug, the first pole connecting piece part 210 is a positive pole connecting piece part, and the first pole lead-out piece part 220 is a positive pole lead-out piece part. Correspondingly, the second pole piece 120 is a negative pole piece, the second pole lug 300 is a negative pole lug, the second pole connecting piece part 310 is a negative pole connecting piece part, and the second pole lead-out piece part 320 is a negative pole lead-out piece part. It can be imagined that in other embodiments, the first pole piece 110 can also be a negative pole piece, the first pole lug 200 can also be a negative pole lug, the first pole connecting piece part 210 can also be a negative pole connecting piece part, and the first pole lead-out piece part 220 can also be a negative pole lead-out piece part. Correspondingly, the second pole piece 120 is a positive pole piece, the second pole lug 300 is a positive pole lug, the second pole connecting piece part 310 is a positive pole connecting piece part, and the second pole lead-out piece part 320 is a positive pole lead-out piece part.

[0033] In the embodiment, the first pole connecting piece part 210 and the second pole connecting piece part 310 are arranged around the circumference of the core body 100 and form a frame-shaped structure, and a first insulating piece 400 is arranged between the end of the first pole connecting piece part 210 and the end of the second pole connecting piece part 310. The first pole connecting piece part 210 and the second pole connecting piece part 310 form a frame-shaped structure, so that the total area of the first pole lug 200 and the second pole lug 300 is large, which is beneficial to improve the heat dissipation effect of the core, so that the current between the first pole piece 110 and the first pole lug 200 and between the second pole piece 120 and the second pole lug 300 is not excessively concentrated, the heating of the core is reduced, and the insulation effect between the two is realized through the first insulating piece 400.

[0034] In the embodiment, the width of the first insulating piece 400 is A, and the width of the core body 100 is B, which satisfies 2mm≤A≤B-20mm. The two ends of the first pole connecting piece part 210 are connected to the two ends of the second pole connecting piece part 310 through the first insulating piece 400. If the width of the first insulating piece 400 is too small, the two ends of the first pole connecting piece part 210 may be short-circuited with the second pole connecting piece part 310, which affects the safety of the use of the laminated core. If the size of the first insulating piece 400 is too large, the size of the first pole connecting piece part 210 and the second pole connecting piece part 310 is too small, which affects the heat dissipation amplification effect of the first pole lug 200 and the second pole lug 300 on the core body 100. Therefore, when the width of the first insulating piece 400 is set to the above size range, the comprehensive use effect is good.

[0035] Specifically, the first pole lead-out piece part 220 and the second pole lead-out piece part 320 are both located at the head of the core, the first pole connecting piece part 210 is entirely located at the head of the core, and the first insulating piece 400 is also located at the head of the core.

[0036] Specifically, the first insulating member 400 can adopt a structure such as an insulating plastic block, an insulating adhesive tape, or the like. The first insulating member 400 can be connected and fixed between the first pole tab portion 210 and the second pole tab portion 310 by means such as adhesion.

[0037] In the embodiment, the first pole tab portion 220 is parallel to the length direction of the battery cell body 100, the first pole tab portion 220 and the first pole tab portion 210 are in an integrated structure, the second pole tab portion 320 is parallel to the length direction of the battery cell body 100, and the second pole tab portion 320 and the second pole tab portion 310 are in an integrated structure. The first pole tab portion 220 is perpendicular to the first pole tab portion 210, and the two are in an integrated structure. In production, the first pole tab 200 is processed by bending to form the first pole tab portion 220 and the first pole tab portion 210. The second pole tab portion 320 is perpendicular to the second pole tab portion 310, and the two are in an integrated structure. In production, the second pole tab 300 is processed by bending to form the second pole tab portion 320 and the second pole tab portion 310. The integrated structure makes the processing of the first pole tab 200 and the second pole tab 300 relatively simple, without the need for vertical splicing and welding of two tab bodies, and has good processability.

[0038] In the embodiment, the first pole tab 110 is provided with a foil tab portion 111 that protrudes relative to the outer peripheral wall of the first pole tab 110. The foil tab portion 111 is welded and connected to the first pole tab portion 210, and the second pole tab portion 310 is welded and connected to the outer peripheral wall of the second pole tab 120. The second pole tab 300 is directly welded and connected to the outer peripheral wall of the second pole tab 120 through the second pole tab portion 310, without the need for the second pole tab 120 to make a foil tab portion 111. The size of the second pole tab 120 in the thickness direction is fully utilized for welding with the second pole tab 300, simplifying the structure of the second pole tab 120. The first pole tab 110 is welded and connected to the first pole tab portion 210 through the protruding foil tab portion 111, which can reduce the risk of short circuit between the first pole tab portion 210 and the second pole tab 120.

[0039] In the embodiment, the cross section of the battery cell body 100 perpendicular to the thickness direction is rectangular, and the battery cell body 100 has four side walls at the outer periphery. The first pole tab portion 210 is opposite one of the side walls, and the second pole tab portion 310 is opposite the four side walls. The above structure can allow the second pole tab portion 310 and the outer peripheral wall of the second pole tab 120 to have a larger connection area, so that the second pole tab 300 and the second pole tab 120 have sufficient conductive contact area and sufficient heat dissipation contact area.

[0040] In the embodiment, the second pole tab 120 comprises a second pole current collector, which is a foamed copper sheet. Specifically, the foamed copper sheet has dense holes inside, and the negative active material is filled in the holes to form the second pole tab 120, which has good conductivity and can reduce the proportion of the current collector in the thickness direction to improve the energy density of the battery. The surface of the first pole current collector 112 perpendicular to the thickness direction is coated with a positive active material layer to form the first pole tab 110.

[0041] Specifically, in the embodiment, the first pole tab 110 is on both sides of the thickness of the cell body 100, and the first pole tab 110 is a single-sided tab, that is, the side of the first pole current collector 112 close to the second pole tab 120 is coated with a positive active material layer, and the side of the first pole current collector 112 away from the second pole tab 120 is not coated with a positive active material layer.

[0042] In the embodiment, a second insulating member 500 is arranged between the second pole tab 120 and the first pole connecting tab part 210. Since the periphery of the second pole tab 120 protrudes relative to the periphery of the first pole tab 110, the second insulating member 500 arranged between the second pole tab 120 and the first pole connecting tab part 210 can reduce the risk of short circuit between the second pole tab 120 and the first pole connecting tab part 210. Specifically, the second insulating member 500 is an insulating adhesive tape, which is attached to the side wall of the second pole tab 120 close to the first pole connecting tab part 210 and the separator 130, which has a simple structure and is convenient to use. It can be imagined that in other embodiments, the second insulating member 500 can also have other structures, for example, a plastic insulating sheet.

[0043] In the embodiment, the first pole connecting tab part 210 and the second pole connecting tab part 310 have the same size along the thickness direction of the cell body 100, the size of the first pole connecting tab part 210 along the thickness direction of the cell body 100 is C, the thickness of the cell body 100 is D, and 0.1mm≤C≤1.15D is satisfied. When the size of the first pole connecting tab part 210 and the second pole connecting tab part 310 along the thickness direction of the cell body 100 is too small, the contact area and the connection strength between the first pole tab 200 and the first pole tab 110 and between the second pole tab 300 and the second pole tab 120 are not enough, and the heat dissipation effect is improved little. When the size of the first pole connecting tab part 210 and the second pole connecting tab part 310 along the thickness direction of the cell body 100 is too large, it occupies too much thickness direction size of the battery, so the size C of the first pole connecting tab part 210 and the second pole connecting tab part 310 along the thickness direction of the cell body 100 in the above range makes the comprehensive use effect of the first pole tab 200 and the second pole tab 300 better.

[0044] Further, in the embodiment, the cell body 100 includes two first pole pieces 110 and one second pole piece 120, the thickness of the first pole piece 110 is E, and 0.5×(D-2E)≤C≤D-2E is satisfied. The cell body 100 of the embodiment adopts two first pole pieces 110 and one second pole piece 120, so that the thickness of the cell body 100 is as thin as possible. At this time, the size of the first pole connecting piece part 210 and the second pole connecting piece part 310 along the thickness direction of the cell body 100 is adopted, so that the connection strength and the contact area of the first tab 200 and the first pole piece 110 and the second tab 300 and the second pole piece 120 are sufficient, the assembly production of the first tab 200 and the first pole piece 110 and the second tab 300 and the second pole piece 120 is facilitated, and the material is saved.

[0045] It can be imagined that in other embodiments, the cell body 100 can also include N first pole pieces 110 and N-1 second pole pieces 120, wherein the first pole pieces 110 at both ends along the stacking direction are single-sided active material layers, and the remaining first pole pieces 110 are double-sided active material layers.

[0046] Specifically, the second pole connecting piece part 310 is welded and connected to the three side walls other than the head of the second pole piece 120 by a multi-point welding mode, the area of the welding spot is increased, the heat dissipation capacity of the second tab 300 is improved, and the temperature rise of the cell is reduced. The length of the cell body 100 is F, the area of the welding spot is S, when the size C of the first pole connecting piece part 210 and the second pole connecting piece part 310 along the thickness direction of the cell body 100 is C≥D, then 0.18×(D-2E)×(2F+B)≤S≤D×(F+B-6) is satisfied; when the size C of the first pole connecting piece part 210 and the second pole connecting piece part 310 along the thickness direction of the cell body 100 is C<D, then 0.18×C×(2F+B)≤S≤C×(F+B-6) is satisfied.

[0047] Specifically, the thickness size D of the cell body 100 is usually ≤2.3mm. The separator 130 is an electrospun separator 130. The tab rubber is arranged on the first pole lead-out piece part 220 and the second pole lead-out piece part 320. The distance between the tab rubber and the separator 130 in the embodiment is also reduced, so as to reduce the size of the first tab 200 and the second tab 300 in the length direction of the battery, and improve the energy density of the battery.

[0048] Specifically, in some embodiments, the battery cell body 100 after reducing the number of layers includes two positive electrode sheets with single-sided active material and one foam copper negative electrode sheet, adopts the above-mentioned positive and negative tabs to form a combined tab, the thickness E of the single-sided active material positive electrode sheet is 0.473 mm, the thickness D of the battery cell body 100 is 2 mm, the height C of the positive and negative tabs is 2 mm, the length F of the battery cell body 100 is 59.8 mm, the width B of the battery cell body 100 is 51 mm, the distance G between the edge of the diaphragm 130 and the tab glue is 2 mm, the half-electric thickness H of the battery cell is 2.3 mm, the length J of the battery cell is 64 mm, and the width K of the battery cell is 52 mm. After the test:

[0049]

[0050]

[0051]

[0052] From the comparison of Comparative Example 1 and Examples 1 to 6, it can be seen that the combined tab + foam copper negative electrode sheet battery cell with reduced number of layers can reduce the distance between the edge of the diaphragm 130 and the tab glue by converting the tab directly out to a combined tab, thereby reducing the energy loss in the length direction; and at the same time, the foam copper negative electrode sheet is used to reduce the number of layers and reduce the proportion of foil in the thickness direction, thereby improving the energy density, and the combination of the two improves the energy density by about 8%.

[0053] Comparative Examples 2 to 3 and Examples 1 to 6, when C>1.15D, such as Comparative Example 2, the tab height exceeds the half-electric thickness of the battery cell, there is a space loss in the thickness direction of the battery cell, resulting in a decrease in energy density; when C<0.1 mm, the tab height is too low, which will lead to small welding area and poor tab heat dissipation, resulting in exceeding the temperature rise standard, the temperature rise standard is not more than 18℃; when 0.1mm≤C≤1.15D, such as Examples 1 to 6, the temperature rise standard can be met without losing energy density, and the preferred range is 0.5×(D-2E)≤C≤D-2E, such as Examples 3 to 5, which can effectively reduce the temperature rise degree and leave electrolyte infiltration channels, without lengthening the electrolyte infiltration time, ensuring production efficiency.

[0054] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description 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.

[0055] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A jelly-roll type battery cell, characterized by, The application relates to a battery cell, which comprises: a battery cell body (100) comprising first pole pieces (110) and second pole pieces (120) alternately stacked in sequence along a thickness direction, a diaphragm (130) being arranged between the first pole pieces (110) and the second pole pieces (120); a first pole lug (200) comprising a first pole connecting piece (210) and a first pole lead-out piece (220), the first pole connecting piece (210) being parallel to the thickness direction of the battery cell body (100), the first pole connecting piece (210) being connected with all the first pole pieces (110), and the first pole lead-out piece (220) being connected with the first pole connecting piece (210); a second pole lug (300) comprising a second pole connecting piece (310) and a second pole lead-out piece (320), the second pole connecting piece (310) being parallel to the thickness direction of the battery cell body (100), the second pole connecting piece (310) being connected with all the second pole pieces (120), and the second pole lead-out piece (320) being connected with the second pole connecting piece (310); the second pole connecting piece (310) and the first pole connecting piece (210) are insulated from each other, and the first pole lead-out piece (220) and the second pole lead-out piece (320) are located at the same end of the battery cell body (100) along a length direction.

2. The stacked cell of claim 1, wherein: The first pole connecting piece (210) and the second pole connecting piece (310) are arranged around the circumference of the battery cell body (100) and form a frame-shaped structure, and a first insulating piece (400) is arranged between the end of the first pole connecting piece (210) and the end of the second pole connecting piece (310).

3. The stacked cell of claim 2, wherein: The width of the first insulating piece (400) is A, and the width of the battery cell body (100) is B, and 2mm<=A<=B-20mm is satisfied.

4. The stacked cell of claim 1, wherein: The first pole lead-out piece (220) is parallel to the length direction of the battery cell body (100), the first pole lead-out piece (220) and the first pole connecting piece (210) are an integral structure, the second pole lead-out piece (320) is parallel to the length direction of the battery cell body (100), and the second pole lead-out piece (320) and the second pole connecting piece (310) are an integral structure.

5. The stacked cell of claim 1, wherein: The first pole piece (110) is provided with a foil lug piece (111) which protrudes relative to the outer peripheral wall of the first pole piece (110), the foil lug piece (111) is welded to the first pole connecting piece (210), and the second pole connecting piece (310) is welded to the outer peripheral wall of all the second pole pieces (120).

6. The stacked cell of claim 5, wherein: The cross section of the battery cell body (100) perpendicular to the thickness direction is rectangular, the outer periphery of the battery cell body (100) has four side walls, the first pole connecting piece (210) is opposite to one of the side walls, and the second pole connecting piece (310) is opposite to at least three of the side walls.

7. The stacked cell of claim 5, wherein: The second pole piece (120) comprises a second pole current collector, and the second pole current collector is a foamed copper sheet.

8. The stacked cell of claim 5, wherein: A second insulating member (500) is arranged between the second pole tab (120) and the first pole connecting tab portion (210).

9. The stacked cell of claim 1, wherein: The first pole connecting tab portion (210) and the second pole connecting tab portion (310) have the same size along the thickness direction of the battery cell body (100), the size of the first pole connecting tab portion (210) along the thickness direction of the battery cell body (100) is C, the thickness of the battery cell body (100) is D, and 0.1mm≤C≤1.15D is satisfied.

10. The stacked cell of claim 9, wherein: The battery cell body (100) comprises two first pole tabs (110) and one second pole tab (120), the thickness of the first pole tab (110) is E, and 0.5×(D-2E)≤C≤D-2E is satisfied.

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