A cuttable battery cell, battery and manufacturing method thereof

Abstract

The present invention discloses a cuttable battery cell, a battery and a manufacturing method thereof, and relates to the technical field of battery structure. The cuttable battery cell includes at least two electrode units, the electrode unit includes a stacked electrode layer and a collector layer, the electrode layer includes a first electrode body and a second electrode body, the pole arm of the first electrode body is meshed with the pole arm of the second electrode body; adjacent electrode units are connected by an electrical connection structure, and the electrical connection structure is used for cutting to split adjacent electrode units; adjacent electrode units are connected by the electrical connection structure for cutting. The pole arm of the first electrode body is meshed with the pole arm of the second electrode body, which improves the area utilization, shortens the ion transmission distance, reduces the internal resistance of the battery, and can increase the effective capacity. In addition, the connection of the electrical connection structure for cutting can make the cuttable battery cell easy to split, which is conducive to customized cutting and rapid assembly of batteries of the required capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of battery structures, and in particular to a cuttable battery cell, a battery and a manufacturing method thereof. Background Art

[0002] With the widespread use of printed electronics in everyday smart objects, corresponding power supply devices, such as planar energy storage batteries or thin-film batteries with coplanar electrodes, have become a growing focus. However, the performance of existing thin-film batteries is limited by losses during ion transport, the amount of active material, and the overall size, leaving much room for improvement in capacity. Summary of the Invention

[0003] The main purpose of the present invention is to provide a tailorable battery cell to increase battery capacity.

[0004] To achieve the above-mentioned purpose, the present invention proposes a cuttable battery cell, comprising at least two electrode units, wherein the electrode unit comprises an electrode layer and a collector layer arranged in a stacked manner, the electrode layer comprises a first electrode body and a second electrode body, and the pole arm of the first electrode body is engaged with the pole arm of the second electrode body; adjacent electrode units are connected by an electrical connection structure, and the electrical connection structure is used for cutting to split adjacent electrode units.

[0005] Optionally, the first electrode body includes a first pole arm, a third pole arm and a second pole arm connected in sequence, and the first pole arm is arranged opposite to the second pole arm; the second electrode body partially extends between the first pole arm and the second pole arm; a first notch and a second notch are respectively provided on both sides of the second electrode body, and a third notch is provided on the end surface of the second electrode body facing the third pole arm; a first inward extension portion, a second inward extension portion and a third inward extension portion are respectively provided on the first pole arm, the second pole arm and the third pole arm, and the first inward extension portion, the second inward extension portion and the third inward extension portion extend into the first notch, the second notch and the third notch respectively.

[0006] Optionally, the collecting layer includes a first collector and a second collector, the first electrode body is arranged on the first collector, the first collector includes a first extension portion extending outward from the first pole arm, a second extension portion extending outward from the second pole arm, and a third extension portion extending outward from the third pole arm; the second electrode body is arranged on the second collector, the second collector includes a fourth extension portion, the fourth extension portion extending outward from an end of the second electrode body away from the third pole arm; one of the first extension portion, the second extension portion, the third extension portion, and the fourth extension portion is connected to one of the first extension portion, the second extension portion, the third extension portion, and the fourth extension portion of the adjacent electrode unit to form the electrical connection structure.

[0007] Optionally, the collecting layer includes a first collector and a second collector; one of the first pole arm, the second pole arm, the third pole arm, and the end of the second electrode body away from the third pole arm is connected to one of the first pole arm, the second pole arm, the third pole arm, and the end of the second electrode body away from the third pole arm of the adjacent electrode unit to form the electrical connection structure; the cuttable battery cell also includes a first diaphragm, and the first collector and the second collector are both arranged on the first diaphragm; the first diaphragm is provided with a first through hole and a second through hole, the first collector passes through the first through hole to connect to the first pole lug, and the second collector passes through the second through hole to connect to the second pole lug.

[0008] Optionally, the first diaphragm is set as a porous diaphragm, and the first through hole and the second through hole are both set as through holes of the porous diaphragm; the first current collector and the second current collector both include printed permeates, and the printed permeates pass through the through holes of the porous diaphragm so that the first current collector and the second current collector are respectively connected to the first pole ear and the second pole ear.

[0009] The present invention also provides a battery comprising the above-mentioned cuttable battery cell.

[0010] The present invention also provides a battery, comprising the above-mentioned cuttable battery cell; at least one of the first extension portion, the second extension portion, and the third extension portion is used to connect to a first electrode tab, and the fourth extension portion is used to connect to a second electrode tab.

[0011] The present invention also proposes a battery, comprising the above-mentioned cuttable battery cell; the battery also includes a first cover plate, a second diaphragm and a connecting frame, the first current collector and the second current collector are both arranged on the second diaphragm, and the second diaphragm is used to seal the electrolyte; one side of the connecting frame is sealed with the first cover plate, and the other side of the connecting frame is sealed with the second diaphragm to form a sealed space for sealing the electrolyte.

[0012] The present invention also proposes a battery, comprising the above-mentioned cuttable battery cell, the battery also including a connecting frame; the first electrode body and the second electrode body are both arranged in the connecting frame, and the outer side of the first electrode body and the outer side of the second electrode body are both abutted against the inner side of the connecting frame; or, the inner side of the connecting frame covers the outer side of the first electrode body and the outer side of the second electrode body; the battery also includes a diaphragm layer, the first collector and the second collector are both arranged on the diaphragm layer; the projection of the outer side of the diaphragm layer along the thickness direction coincides with the projection of the inner side of the connecting frame along the thickness direction; or the projection of the outer side of the diaphragm layer along the thickness direction is located on the inner side of the projection of the inner side of the connecting frame along the thickness direction.

[0013] The present invention also proposes a battery manufacturing method for manufacturing a battery, wherein the battery includes the above-mentioned cuttable battery cell, and the battery also includes a first cover plate, a connecting frame and a second cover plate, one side of the connecting frame is sealed with the first cover plate, and the other side of the connecting frame is sealed with the second cover plate to form a sealed space for blocking the electrolyte; the battery manufacturing method includes the following steps: adding electrolyte into the sealed space so that the electrolyte is filled into the first diaphragm; moving the first cover plate toward the second cover plate to squeeze the first diaphragm so that the electrolyte flows out from the first diaphragm.

[0014] The technical solution of the present invention is to configure a cuttable battery cell to include at least two electrode units, wherein the electrode unit includes a stacked electrode layer and a current collecting layer, wherein the electrode layer includes a first electrode body and a second electrode body, wherein the pole arm of the first electrode body meshes with the pole arm of the second electrode body; adjacent electrode units are connected by an electrical connection structure, and the electrical connection structure is used for cutting to separate adjacent electrode units; the pole arm of the first electrode body meshes with the pole arm of the second electrode body, thereby improving the area utilization rate of the plane where the electrode layer is located, shortening the ion transmission distance, reducing the internal resistance of the battery, and increasing the effective capacity of the battery per unit area. In addition, the electrical connection structure for cutting can make the cuttable battery cell easy to disassemble, which is conducive to customized cutting and enables users to quickly assemble a battery with the capacity they need. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 Schematic diagram of the structure of a cuttable battery cell according to an embodiment of the present invention.

[0017] Figure 2 An exploded view of an embodiment of a cuttable battery cell according to the present invention.

[0018] Figure 3 FIG. 1 is a schematic cross-sectional view of an embodiment of a cuttable battery cell according to the present invention.

[0019] Figure 4 FIG. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention (partial structure is hidden).

[0020] Figure 5 Schematic diagram of the structure of another embodiment of the cuttable battery cell of the present invention.

[0021] Figure 6 FIG1 is an exploded view of another embodiment of a cuttable battery cell according to the present invention.

[0022] Figure 7 FIG1 is a schematic structural diagram of another embodiment of a battery of the present invention (partial structure is hidden).

[0023] Figure 8 FIG1 is a schematic structural diagram of another embodiment of a battery of the present invention (partial structure is hidden).

[0024] Description of Figure Numbers:

[0025] Label name Label name 1 electrode layer 11 first electrode body 111 First pole arm 112 Second pole arm 113 The third pole arm 114 First inner extension 115 Second inner extension 116 The third inner extension 12 Second electrode body 121 First gap 122 The second gap 123 The third gap 2 current collecting layer 21 First extension 22 Second extension 23 The third extension 24 Fourth extension 25 Printing penetrant 261 First conductor 271 first conductive portion 272 Second conductive portion 31 First diaphragm 311 First through hole 32 Second diaphragm 41 First tab 42 Second tab 52 Second cover 6 Connection frame

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy 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 mutually 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 present invention.

[0030] The present invention provides a cuttable battery cell. Figures 1 to 3 A schematic diagram of a cuttable battery cell. Figure 4 The figure is a schematic diagram of a battery including the cuttable cell. The cell is the portion of the thin-film battery sandwiched between the upper and lower cover plates.

[0031] Reference Figure 1 and Figure 2 In one embodiment of the present invention, the cuttable battery cell includes at least two electrode units, and the electrode unit includes a stacked electrode layer 1 and a collector layer 2, so that a thin film battery can be formed by stacking the electrode layer 1 and the collector layer 2. Figure 1 The topmost split unit diagram is an electrode unit. The electrode layer includes a first electrode body 11 and a second electrode body 12. The pole arms of the first electrode body 11 mesh with the pole arms of the second electrode body 12. Specifically, the pole arms of the first electrode body 11 and the second electrode body 12 can be arranged in a fractal structure (such as a Peano fractal or a Hilbert fractal). They can be combined according to the following structure to form a coplanar thin-film battery.

[0032] The first electrode body 11 includes a first pole arm 111, a third pole arm 113 and a second pole arm 112 connected in sequence. The first pole arm 111 and the second pole arm 112 are arranged opposite to each other, so that the first pole arm 111, the third pole arm 113 and the second pole arm 112 are in an open frame shape as a whole. The first electrode body 11 can also be conveniently made into Figure 1 The rectangular shape shown.

[0033] The second electrode body 12 partially extends between the first pole arm 111 and the second pole arm 112, that is, Figure 1 As shown, the upper end portion of the second electrode body 12 extends between the first pole arm 111 and the second pole arm 112. Adjacent electrode units are connected by an electrical connection structure, which is used for cutting to separate adjacent electrode units, such as by Figure 1 The dotted box shown in the figure cuts out the required one or more electrode units. The first notch 121 and the second notch 122 are provided so that the end of the second electrode body 12 away from the third pole arm 113 laterally covers more of the first electrode body 11.

[0034] For the above-mentioned cuttable battery cell, the pole arm of the first electrode body 11 is engaged with the pole arm of the second electrode body 12, and a sufficiently small Figure 1 The unit pattern improves the area utilization of the plane where the electrode layer 1 is located, shortens the ion transmission distance, reduces the internal resistance of the battery, and can increase the effective capacity of the battery per unit area. In addition, the electrical connection structure for cutting can facilitate the disassembly of the cuttable battery cells, facilitating customized cutting and allowing users to quickly assemble a battery with the capacity they need.

[0035] As an optional embodiment, Figure 1 As shown, a first notch 121 and a second notch 122 are respectively provided on both sides of the second electrode body 12, and a third notch 123 is provided on the end surface of the second electrode body 12 facing the third pole arm 113; a first inner extension portion 114, a second inner extension portion 115, and a third inner extension portion 116 are respectively provided on the first pole arm 111, the second pole arm 112, and the third pole arm 113, and the first inner extension portion 114, the second inner extension portion 115, and the third inner extension portion 116 extend into the first notch 121, the second notch 122, and the third notch 123 respectively; it should be noted that the first notch 121, the second notch 122, and the third notch 123 can be as follows Figure 1 The notch shown is rectangular as a whole. In this case, the first inward extension 114, the second inward extension 115, and the third inward extension 116 are rectangular as a whole. The first notch 121, the second notch 122, and the third notch 123 can also be notches that are arc-shaped (such as semicircular or open ring). In this case, the first inward extension 114, the second inward extension 115, and the third inward extension 116 are elliptical or circular as a whole (that is, the outer shape corresponds to the arc (such as semicircular or open ring)). The first electrode body 11 and the second electrode body 12 of this structure cooperate with each other to further improve the area utilization rate of the plane where the electrode layer 1 is located.

[0036] As an optional embodiment, Figure 2 、 Figure 3 As shown, the current collecting layer 2 includes a first current collector and a second current collector. Figure 1 As shown, one of the first pole arm 111, the second pole arm 112, the third pole arm 113, and the end of the second electrode body 12 away from the third pole arm 113 is connected to one of the first pole arm 111, the second pole arm 112, the third pole arm 113, and the end of the second electrode body 12 away from the third pole arm 113 of the adjacent electrode unit to form an electrical connection structure. Figure 1 In the schematic diagram of the middle layer in FIG, the electrode unit composed of the first electrode body 11 and the second electrode body 12 is generally square in shape. The second electrode arm 112 of the electrode unit in the upper left corner is connected to the first electrode arm 111 of the electrode unit in the upper right corner. The end of the second electrode body 12 of the electrode unit in the upper right corner away from the third electrode arm 113 is connected to the second electrode arm 112 of the electrode unit in the lower right corner. The third electrode arm 113 of the electrode unit in the lower right corner is connected to the third electrode arm 113 of the electrode unit in the lower left corner. The first electrode arm 111 of the electrode unit in the lower left corner is connected to the end of the second electrode body 12 of the electrode unit in the upper left corner away from the third electrode arm 113. The first electrode body 11 and the second electrode body 12 are directly connected through their own structures to form an electrically connected structure. Therefore, the electrode units to be split can be separated when cutting the electrode layer 1. The direct connection between the first electrode body 11 and the second electrode body 12 also improves the overall compactness of the cuttable battery cell.

[0037] like Figure 2 、 Figure 3 As shown, the cuttable battery cell further includes a first separator 31, on which the first current collector and the second current collector are both disposed. The first separator 31 is provided with a first through-hole 311 and a second through-hole. The first current collector passes through the first through-hole 311 to connect to the first electrode tab 41, and the second current collector passes through the second through-hole to connect to the second electrode tab 42. This method of connecting the electrode tabs saves horizontal area occupied by the cuttable battery cell when making electrical connections with the outside.

[0038] As a further optional embodiment, the first separator 31 is configured as a porous separator, and the first through-hole 311 and the second through-hole are configured as through-holes of the porous separator. The first and second current collectors each include a printed penetrant 25. The printed penetrant 25 is a structure formed by the first and second current collectors penetrating into the first and second through-holes 311 and 42 through the through-holes of the porous separator. The printed penetrant 25 passes through the through-holes of the porous separator, allowing the first and second current collectors to connect to the first and second tabs 41 and 42, respectively. This fully utilizes the through-holes of the porous separator to achieve electrical connection between the cuttable battery cell and the outside.

[0039] like Figure 4 As shown, in the embodiment of the battery proposed by the present invention, the battery includes the above-mentioned cuttable battery cell; the battery also includes a first cover (on Figure 4 The connecting frame 6 is connected to the first cover plate 52 and the other side of the connecting frame 6 is connected to the second cover plate 52 to form a sealed space for sealing the electrolyte. Figure 3As shown, a conductive layer is further provided on the side of the first diaphragm 31 away from the first current collector. The conductive layer includes a first conductor 261 and a second conductor. The first conductor 261 and the second conductor are electrically connected to the first current collector and the second current collector respectively. Figure 4 As shown, a first conductive portion 271 and a second conductive portion 272 are provided on the inner side of the second cover plate 52. The first conductive portion 271 is used to connect to the first conductor 261 and is also used to connect to the first tab 41. The second conductive portion 272 is connected to the second conductor and is also used to connect to the second tab 42. In this type of battery, after the first and second conductors 261 and 272 are positioned correspondingly to each other, the first and second conductive portions 271 and 272 can be manufactured and integrated with the second cover plate 52. This improves the convenience of connecting the first and second conductors 261 and 272 to the first and second conductive portions, 271 and 272, while also increasing the overall manufacturing efficiency of the battery.

[0040] Corresponding to the above-mentioned battery, this embodiment also proposes a battery manufacturing method, which is used to manufacture the above-mentioned battery, and the battery manufacturing method includes the following steps: adding electrolyte in a sealed space so that the first diaphragm 31 is filled with electrolyte; in this embodiment, the electrolyte is set as an electrolyte; this step specifically includes dripping electrolyte around the first through hole 311 (specifically the through hole of the porous diaphragm) or directly immersing the electrode layer 1 base in the electrolyte, and locking the electrolyte through the first through hole 311.

[0041] The battery manufacturing method further includes the steps of moving the first cover plate toward the second cover plate 52 (this movement is relative, i.e., in practice, the first cover plate can move, or the second cover plate 52 can move, as long as the two are close to each other) to squeeze the first diaphragm 31, so that the electrolyte flows out of the first diaphragm 31, and the squeezed electrolyte is used for the chemical reaction between the first electrode body 11 and the second electrode body 12; specifically, the through-holes of the first diaphragm 31 (in the form of a porous diaphragm) not covered by the collector layer 2 generally contain more electrolyte, and the electrolyte flows more from the through-holes not covered by the collector layer 2. This battery manufacturing method improves the overall manufacturing efficiency of the battery by squeezing out the electrolyte through the movement of the first and second cover plates 52 during the assembly process.

[0042] Different from the cuttable battery cell of the above embodiment, in an alternative embodiment of the cuttable battery cell, the difference includes the specific composition of the electrical connection structure for cutting.

[0043] like Figure 5As shown, the collector layer 2 includes a first collector and a second collector, and the first electrode body 11 is arranged on the first collector; the first collector includes a first extension portion 21 extending outward from the first pole arm 111, a second extension portion 22 extending outward from the second pole arm 112, and a third extension portion 23 extending outward from the third pole arm 113; the second electrode body 12 is arranged on the second collector, and the second collector includes a fourth extension portion 24, which extends outward from an end of the second electrode body 12 away from the third pole arm 113; one of the first extension portion 21, the second extension portion 22, the third extension portion 23, and the fourth extension portion 24 is connected to one of the first extension portion 21, the second extension portion 22, the third extension portion 23, and the fourth extension portion 24 of the adjacent electrode unit to form an electrical connection structure.

[0044] See also Figure 5 In the schematic diagram of the lower level, the outer shape of the electrode unit composed of the first electrode body 11 and the second electrode body 12 is set to be a square as a whole, the second extension part 22 and the third extension part 23 of the electrode unit in the upper left corner are respectively connected to the first extension part 21 and the third extension part 23 of the electrode unit in the upper right corner, the fourth extension part 24 and the second extension part 22 of the electrode unit in the upper right corner are respectively connected to the second extension part 22 and the fourth extension part 24 of the electrode unit in the lower right corner, the third extension part 23 and the first extension part 21 of the electrode unit in the lower right corner are respectively connected to the third extension part 23 and the second extension part 22 of the electrode unit in the lower left corner, and the first extension part 21 and the fourth extension part 24 of the electrode unit in the lower left corner are respectively connected to the fourth extension part 24 and the first extension part 21 of the electrode unit in the upper left corner. By directly connecting the first current collector and the second current collector to form an electrical connection structure, the electrode units that need to be split can be separated after cutting the collector layer 2, reducing the loss of the electrode layer 1 caused by the cutting operation and improving the utilization rate of the cuttable battery cells.

[0045] like Figure 6 、 Figure 7 、 Figure 8 As shown, in the embodiment of the battery proposed by the present invention, the battery includes the above-mentioned cuttable battery cell; at least one of the first extension portion 21, the second extension portion 22, and the third extension portion 23 is used to connect to the first tab 41, and the fourth extension portion 24 is used to connect to the second tab 42, so that the direction of the tab can be set arbitrarily, thereby improving the adaptability of the battery when connected to the outside. Specifically, it can be set to Figure 7 As shown, the first extension portion 21, the second extension portion 22, and the third extension portion 23 are all connected to the first tab 41; they can also be set as follows Figure 8 As shown, only the first tab 41 is connected.

[0046] As an optional embodiment, Figure 7As shown, the battery also includes a first cover plate, a second diaphragm 32, and a connecting frame 6; the connecting frame 6 can be a sealing rubber frame or a sealing frame formed by hot pressing. The first current collector and the second current collector are both arranged on the second diaphragm 32. The second diaphragm 32 is used to block the electrolyte, that is, the second diaphragm 32 is an impermeable membrane that prevents the electrolyte from passing through; one side of the connecting frame 6 is sealed to the first cover plate, and the other side of the connecting frame 6 is sealed to the second diaphragm 32 to form a sealed space for blocking the electrolyte. In this case, the second diaphragm 32 can replace the function of the cover plate, reducing the amount of cover plate used, reducing the thickness of the battery, and also reducing the overall cost of the battery.

[0047] As an optional embodiment, the difference is that, Figure 8 As shown, the first electrode body 11 and the second electrode body 12 are both disposed within the connection frame 6, with the outer sides of the first electrode body 11 and the outer sides of the second electrode body 12 both abutting against the inner side of the connection frame 6; or, the inner side of the connection frame 6 covers the outer sides of the first electrode body 11 and the outer sides of the second electrode body 12; the battery further includes a diaphragm layer, which can be configured as the first diaphragm 31 or the second diaphragm 32 described above, with the first current collector and the second current collector both disposed on the diaphragm layer; the projection of the outer side of the diaphragm layer along the thickness direction coincides with the projection of the inner side of the connection frame 6 along the thickness direction; or the projection of the outer side of the diaphragm layer along the thickness direction is located inward of the projection of the inner side of the connection frame 6 along the thickness direction. This type of battery eliminates the space between the first electrode body 11, the second electrode body 12, and the connection frame 6, and the electrode layer 1 occupies a larger distribution area on the battery plane, which is beneficial for increasing the battery's capacitance per unit area.

[0048] The battery and battery manufacturing method proposed in the present invention adopt all the technical solutions of all the above-mentioned embodiments of the cuttable battery cell, and therefore have at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cuttable battery cell, characterized in that: The thin-film battery comprises at least two electrode units, each comprising a stacked electrode layer and a current collecting layer, the electrode layer comprising a first electrode body and a second electrode body, a fractal structure being provided between the pole arms of the first electrode body and the pole arms of the second electrode body, the pole arms of the first electrode body and the pole arms of the second electrode body being meshed to form a coplanar thin-film battery; adjacent electrode units are connected by an electrical connection structure, the electrical connection structure being adapted to be cut to separate adjacent electrode units; The first electrode body includes a first pole arm, a third pole arm, and a second pole arm connected in sequence, the first pole arm and the second pole arm are arranged opposite to each other, and the first pole arm, the third pole arm, and the second pole arm are overall in the shape of an open frame; the second electrode body partially extends between the first pole arm and the second pole arm; A first notch and a second notch are respectively provided on both sides of the second electrode body, and a third notch is provided on the end surface of the second electrode body facing the third pole arm; a first inward extension portion, a second inward extension portion, and a third inward extension portion are respectively provided on the first pole arm, the second pole arm, and the third pole arm, and the first inward extension portion, the second inward extension portion, and the third inward extension portion extend into the first notch, the second notch, and the third notch, respectively; The collecting layer includes a first collector and a second collector, the first electrode body is arranged on the first collector, the first collector includes a first extension portion extending outward from the first pole arm, a second extension portion extending outward from the second pole arm, and a third extension portion extending outward from the third pole arm; the second electrode body is arranged on the second collector, the second collector includes a fourth extension portion, the fourth extension portion extending outward from an end of the second electrode body away from the third pole arm; one of the first extension portion, the second extension portion, the third extension portion, and the fourth extension portion is connected to one of the first extension portion, the second extension portion, the third extension portion, and the fourth extension portion of the adjacent electrode unit to form the electrical connection structure.

2. A battery, characterized in that: Comprising the cuttable battery cell as claimed in claim 1.

3. A battery, characterized in that: It comprises the cuttable battery cell as claimed in claim 1; at least one of the first protruding portion, the second protruding portion, and the third protruding portion is used to connect to the first pole tab, and the fourth protruding portion is used to connect to the second pole tab.

4. A battery, characterized in that: It includes the cuttable battery cell as described in claim 1; the battery also includes a first cover plate, a second diaphragm and a connecting frame, the first current collector and the second current collector are both arranged on the second diaphragm, and the second diaphragm is used to seal the electrolyte; one side of the connecting frame is sealed with the first cover plate, and the other side of the connecting frame is sealed with the second diaphragm to form a sealed space for sealing the electrolyte.

5. A battery, characterized in that: The battery comprises the cuttable battery cell according to claim 1, wherein the battery further comprises a connecting frame; The first electrode body and the second electrode body are both disposed within the connection frame, and the outer sides of the first electrode body and the outer sides of the second electrode body are in contact with the inner side of the connection frame; or, the inner side of the connection frame covers the outer sides of the first electrode body and the outer sides of the second electrode body; The battery further comprises a separator layer, wherein the first current collector and the second current collector are both disposed on the separator layer; The projection of the outer side of the diaphragm layer along the thickness direction coincides with the projection of the inner side of the connection frame along the thickness direction; or the projection of the outer side of the diaphragm layer along the thickness direction is located inside the projection of the inner side of the connection frame along the thickness direction.

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