Pole piece, battery cell and lithium battery

Abstract

The utility model discloses a pole piece, a battery cell and a lithium battery, the pole piece comprises a pole piece main body, the pole piece main body comprises two current collectors and a pole piece connecting piece for connecting the two current collectors, the surface of each current collector is provided with an active substance coating layer, an empty foil area and a cutting avoiding area, the cutting avoiding areas and the empty foil areas are arranged on the two sides of one end of each current collector at intervals, the empty foil areas are located in the current collectors, and the pole piece connecting piece and the two current collectors are integrally punched and formed; and when the two current collectors are oppositely overturned and attached, the two empty foil areas are overlapped with each other, and the two cutting avoiding areas are overlapped with each other. By adopting the structure, the connection between the two current collectors and the pole piece connecting piece is firmer, the conductivity is better, and when the tab is welded in the empty foil area, the length of the tab extending out of the current collector can be shortened, so that the current collector can be longer and coated with more active substances, and the energy density of the pole piece is favorably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a pole piece, a battery cell and a lithium battery using the battery cell. BACKGROUND

[0002] It is known that with the development of society and the continuous progress of science and technology, the entertainment property of mobile phones and other electronic products is getting stronger and stronger, and mobile phones and other electronic products have put forward higher requirements for the capacity and large-rate discharge performance of lithium batteries.

[0003] The existing soft package lithium battery generally comprises a soft package shell and a laminated core accommodated in the shell, the laminated core generally adopts a structure that a plurality of first pole pieces and a plurality of second pole pieces are stacked alternately, an insulating diaphragm is arranged between adjacent first pole pieces and second pole pieces, each two adjacent first pole pieces are electrically connected by a first connecting piece to form a whole, and each two adjacent second pole pieces are electrically connected by a second connecting piece to form a whole. Although the above structure realizes the electrical connection of the two first pole pieces to form a whole and the electrical connection of the two second pole pieces to form a whole, the welding quality will affect the electrical conductivity between the two first pole pieces and the electrical conductivity between the two second pole pieces because the first connecting piece is welded to the first pole piece and the second connecting piece is welded to the second pole piece. If the welding is not firm, the first pole piece and the first connecting piece may separate from each other and / or the second pole piece and the second connecting piece may separate from each other during the subsequent use of the soft package lithium battery, which seriously affects the performance of the soft package lithium battery.

[0004] In addition, the first and second pole ears of the existing laminated core are generally arranged at the same end of the core body, and the first and second pole ears extend outward from one end of the core body. When the laminated core is placed in the soft package shell, the first and second pole ears need to occupy a certain space, so that the core body needs to be reduced in size, thereby reducing the capacity of the soft package lithium battery. TECHNICAL PROBLEM

[0005] The utility model aims at least to solve one of the technical problems existing in the prior art. To this end, the utility model provides a pole piece, which can make the electrical connection between the two current collectors more stable and reliable. The utility model provides a battery cell using the above-mentioned pole piece, which can make the electrical connection between the two current collectors of the pole piece more stable and reliable. The utility model provides a lithium battery using the above-mentioned battery cell, which helps to increase the capacity of the lithium battery.

[0006] According to the embodiment of the utility model, a kind of pole piece, including pole piece main part, the pole piece main part includes two pieces of current collector and pole piece connecting sheet, the surface of each piece of the current collector is provided with active material coating layer, empty foil area and cutting avoidance area, the shape of the cutting avoidance area is same with the shape of the empty foil area, the cutting avoidance area and the empty foil area are mutually spaced and arranged on the two sides of one end of the current collector, the empty foil area is arranged by the periphery of the current collector to the inside of the current collector, the pole piece connecting sheet is located between the two pieces of the current collector, and the pole piece connecting sheet both ends one-to-one with two pieces of the current collector is connected, the pole piece connecting sheet and two pieces of the current collector are integrally punched out and formed;Wherein, when two pieces of the current collector are reversely attached, two empty foil areas overlap each other, and two cutting avoidance areas overlap each other.

[0007] According to the embodiment of the utility model, a kind of pole piece, at least has following beneficial effects: by using pole piece connecting sheet to connect two pieces of current collector together, and pole piece connecting sheet and two pieces of current collector are integrally punched out and formed structure, thus foil base material can be directly punched out and formed to the required two pieces of current collector and pole piece connecting sheet, without subsequent welding mode to weld pole piece connecting sheet and two pieces of current collector together, help to improve production efficiency, and the connection between pole piece connecting sheet and two pieces of current collector is more firm, not affected by welding quality, so that the electrical connection quality between two pieces of current collector is higher, and pole piece connecting sheet and current collector are not easy to separate subsequently;Meanwhile, empty foil area is arranged by the periphery of the current collector to the inside of the current collector, so that the empty foil area is an inner recess structure arranged on the surface of the current collector, so that the welding portion of the pole lug can be welded in the recessed empty foil area, so that the length of the pole lug located outside the current collector is shorter, so that the length of the current collector can be increased while keeping the width of the current collector and the overall length of the pole lug and the current collector unchanged, thereby increasing the surface area of the current collector, so that more active material can be coated on the surface of the current collector, to help improve the energy density of the pole piece.

[0008] In some embodiments of the utility model, the empty foil area is arranged on one side of the current collector close to the other current collector, and the cutting avoidance area is arranged on one side of the current collector away from the other current collector.

[0009] In some embodiments of the utility model, a notch groove is formed between the side of the empty foil area close to the cutting avoidance area and the current collector.

[0010] In some embodiments of the utility model, one end of the pole piece connecting sheet is connected to the empty foil area of one of the current collectors, and the other end of the pole piece connecting sheet is connected to the empty foil area of the other current collector.

[0011] In some embodiments of this utility model, the distance between the two current collectors is L3, which satisfies 10mm≥L3≥3mm.

[0012] In some embodiments of this utility model, the empty foil area is rectangular in shape, the length of the empty foil area is L1, which satisfies 15mm > L1 > 10mm, and the width of the empty foil area is L2, which satisfies 8mm > L2 > 5mm.

[0013] A battery cell according to an embodiment of the present invention includes a first electrode and a second electrode. The second electrode is the electrode body described above. The first electrode is stacked on the upper surface of one of the current collectors of the second electrode, and the other current collector is flipped and stacked on the upper surface of the first electrode. An insulating membrane is provided between the two current collectors and the first electrode. The first electrode has a first tab welded to the position corresponding to the cutting avoidance area, and the empty foil area of ​​the second electrode has a second tab welded to it.

[0014] According to an embodiment of the present invention, a battery cell has at least the following beneficial effects: By employing the aforementioned electrode, the battery cell of this embodiment allows the two current collectors of the second electrode and the electrode connecting piece to be integrally stamped and formed, which helps to improve the production efficiency of the second electrode. Furthermore, the connection between the two current collectors of the second electrode is more robust and unaffected by welding quality, thus resulting in higher electrical connection quality between the two current collectors of the second electrode. Simultaneously, the empty foil area of ​​the second electrode has a concave structure, so the welding portion of the second electrode tab is welded to the empty foil area of ​​the second electrode and the first electrode located outside the current collector... The tab length is shorter, and the tab welding area of ​​the first electrode can be set at the position corresponding to the cutting avoidance area of ​​the first electrode. Therefore, when the first tab is welded to the tab welding area of ​​the first electrode, the length of the first tab located outside the first electrode is shorter. Thus, while keeping the width of the first and second electrodes unchanged, the overall length of the first electrode and the first tab unchanged, and the overall length of the second electrode and the second tab unchanged, the length of the first and second electrodes can be increased. Therefore, more active material can be coated on the surface of the first and second electrodes, which helps to improve the energy density of the cell.

[0015] In some embodiments of this utility model, the structure of the first electrode is the same as the structure of the electrode body. One current collector of the first electrode is stacked between two current collectors of the second electrode. The other current collector of the first electrode is flipped and attached to the upper or lower surface of one current collector of the second electrode. Along the stacking direction of the first electrode and the second electrode, a diaphragm is provided between two adjacent current collectors.

[0016] A lithium battery according to an embodiment of the present invention includes a casing, and the aforementioned battery cell is placed inside the casing.

[0017] A lithium battery according to an embodiment of the present invention has at least the following beneficial effects: By using the above-mentioned cell, the lithium battery of this embodiment makes the connection between the two current collectors of the second electrode more robust and unaffected by the welding quality, thus resulting in higher electrical connection quality between the two current collectors of the second electrode; at the same time, while keeping the width of the first electrode and the second electrode, the overall length of the first electrode and the first tab, and the overall length of the second electrode and the second tab unchanged, the length of the first electrode and the second electrode can be increased, so that more active material can be coated on the surface of the first electrode and the second electrode, which helps to improve the energy density of the lithium battery.

[0018] In some embodiments of this utility model, the outer shell is a soft-pack shell.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] 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:

[0021] Figure 1 This is a schematic diagram of the structure of an electrode sheet according to a certain embodiment of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 To adopt Figure 1 The diagram shows a partial process structure of electrode sheet fabrication in battery cell manufacturing.

[0024] Figure 4 To adopt Figure 1 The diagram shows the end face structure of a battery cell made from electrode sheets.

[0025] Figure 5 for Figure 4 The image shows a front view of the battery cell;

[0026] Figure 6 To adopt Figure 1 The diagram shows a schematic of the end face structure of a battery cell according to another embodiment of electrode fabrication.

[0027] Figure 7 This is a schematic diagram of the structure of a lithium battery according to certain embodiments of the present invention.

[0028] Figure label:

[0029] Electrode body 100, current collector 110, active material coating layer 120, empty foil area 130, cutting avoidance area 140, notch groove 150, second electrode tab 160, electrode connecting piece 200, first electrode 300, first electrode tab 310, diaphragm 400, outer shell 500. Detailed Implementation

[0030] 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.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying 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.

[0032] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0034] Reference Figure 1 and Figure 2The utility model discloses some embodiments of a kind of pole piece (also sometimes simply pole piece in the following embodiments), the pole piece of this embodiment includes pole piece main body 100, pole piece main body 100 includes two pieces of current collector 110 and pole piece connecting piece 200 arranged at intervals, the surface of each piece of current collector 110 is provided with active material coating layer 120, empty foil area 130 and cutting avoidance area 140, the shape of cutting avoidance area 140 is same with the shape of empty foil area 130, cutting avoidance area 140 and empty foil area 130 are arranged at two sides of one end of current collector 110 mutually spaced, empty foil area 130 is arranged by extending from the circumference of current collector 110 to the inside of current collector 110, pole piece connecting piece 200 is located between two pieces of current collector 110, and one-to-one correspondence of two ends of pole piece connecting piece 200 is connected with two pieces of current collector 110, i.e. one end of pole piece connecting piece 200 is connected with one piece of current collector 110, the other end of pole piece connecting piece 200 is connected with another piece of current collector 110, in this embodiment, pole piece connecting piece 200 and two pieces of current collector 110 are integrally punched and formed;Wherein, when two pieces of current collector 110 are reversely attached, two empty foil areas 130 overlap each other, and two cutting avoidance areas 140 overlap each other.

[0035] By setting pole piece connecting piece 200 and two pieces of current collector 110 as integrally punched and formed structure, thus foil base material can be directly punched and formed into required two pieces of current collector 110 and pole piece connecting piece 200, without subsequent need of welding pole piece connecting piece 200 and two pieces of current collector 110 together, which helps to improve production efficiency, and the connection between pole piece connecting piece 200 and two pieces of current collector 110 is more firm, not affected by welding quality, so that the electrical connection quality between two pieces of current collector 110 is higher, and pole piece connecting piece 200 and current collector 110 are not easy to separate subsequently; simultaneously, empty foil area 130 is arranged by extending from the circumference of current collector 110 to the inside of current collector 110, so that empty foil area 130 is arranged concavely on the surface of current collector 110, so that the welding part of tab can be welded on concave empty foil area 130, so that the length of tab located outside current collector 110 is shorter, so that the length of current collector 110 can be increased, and the surface area of current collector 110 is increased, so that more active material can be coated on the surface of current collector 110, which helps to improve the energy density of pole piece.

[0036] In addition, it should be noted that, in the process of producing current collector 110, cutting equipment can be used to cut and remove the position corresponding to cutting avoidance area 140 at one end of current collector 110, so that the required cutting avoidance area 140 can be formed on current collector 110, which helps to further improve the production efficiency of current collector 110.

[0037] In order to make the structure of the pole piece more reasonable, in some embodiments of the utility model, the empty foil area 130 is arranged on one side of the current collector 110 close to another current collector 110, and the cutting avoidance area 140 is arranged on the side of the current collector 110 away from another current collector 110. At this time, the two empty foil areas 130 of the pole piece are correspondingly located on the inner side of the two current collectors 110 close to each other at one end, and the two cutting avoidance areas 140 are correspondingly located on the outer side of the two current collectors 110 away from each other at one end.

[0038] Referring to Figure 1 And Figure 2 In some embodiments of the utility model, a notch groove 150 is arranged between the side of the empty foil area 130 close to the cutting avoidance area 140 and the current collector 110, and in this embodiment, the notch groove 150 extends along the edge of the empty foil area 130 and makes the empty foil area 130 connected to the current collector 110 at one end. Specifically, when producing the current collector 110, the current collector 110, the empty foil area 130 and the notch groove 150 are directly punched and formed on the foil substrate by using a punching equipment, which is convenient for the production and processing of the current collector 110, improves the production efficiency, and through the above structure, the empty foil area 130 is connected to the current collector 110 at one end, when the pole lug is welded to the empty foil area 130, the user can fold the welding part of the pole lug and the empty foil area 130 together, so that the length of the pole lug outside the current collector 110 is shorter.

[0039] In some embodiments of the utility model, one end of the pole piece connecting piece 200 is connected to the empty foil area 130 of one of the current collectors 110, and the other end of the pole piece connecting piece 200 is connected to the empty foil area 130 of the other current collector 110. Through the above structure, the two empty foil areas 130 of the two current collectors 110 are connected together by using the pole piece connecting piece 200, when the two current collectors 110 of the pole piece of this embodiment are folded and placed, the pole piece connecting piece 200 can enhance the structural strength of the two empty foil areas 130, so that after the pole lug is welded to the empty foil area 130, the anti-twisting ability of the pole lug and the pole piece can be enhanced, and the safety performance is improved.

[0040] In some embodiments of the utility model, the distance between the two current collectors 110 is L3, which satisfies 10mm≥L3≥3mm. Through the above structure, when the punching equipment punches and forms the current collector 110 and the pole piece connecting piece 200 from the foil substrate, it can prevent the pole piece connecting piece 200 or the current collector 110 from being broken, and at the same time, it can improve the utilization rate of the foil substrate, prevent the foil substrate from being wasted and cause the production cost to be too high.

[0041] In some embodiments of the utility model, the shape of the empty foil area 130 is rectangular, the length of the empty foil area 130 is L1, and 15mm > L1 > 10mm is satisfied, and the width of the empty foil area 130 is L2, and 8mm > L2 > 5mm is satisfied. Through the above structure, when the subsequent tab is welded to the empty foil area 130, the tab and the empty foil area 130 have sufficient welding area, ensuring that the welding between the tab and the empty foil area 130 is firm and reliable, reducing the risk of tab virtual welding, and preventing the area of the empty foil area 130 from being too large to reduce the area of the active material coating layer 120, so that the current collector 110 can coat more active material, which helps to improve the energy density of the pole piece.

[0042] Referring to Figures 1 to 5 ( Figure 3 The direction of the arrow indicates the direction of the current collector 110 folding over), one of the electric cores (sometimes also referred to as an electric core in the following embodiments) of some embodiments of the utility model, an electric core includes a first pole piece 300 and a second pole piece, wherein the second pole piece is the pole piece body 100 of the above embodiment, in this embodiment, the shape structure and size of the first pole piece 300 are consistent with the shape structure and size of one of the current collectors 110 of the pole piece body 100. As shown in Figure 3 and Figure 4 The first pole piece 300 is stacked on the upper surface of one of the current collectors 110 of the second pole piece, and the other current collector 110 of the second pole piece is folded over and stacked on the upper surface of the first pole piece 300, and the two current collectors 110 of the second pole piece are provided with an insulating diaphragm 400 between the first pole piece 300, that is, the diaphragm 400 is provided between the lower surface of the first pole piece 300 and the current collector 110 below, and the diaphragm 400 is provided between the upper surface of the first pole piece 300 and the current collector 110 above, wherein the first pole piece 300 is welded with the first tab 310 corresponding to the cutting avoidance area 140, and the second pole piece is welded with the second tab 160, at this time, the first tab 310 and the second tab 160 are located at the same end of the electric core. Since the insulating diaphragm 400 is a known technology in the art, it will not be described here.

[0043] The electrode core of the embodiment is formed by adopting the above-mentioned tab, so that the two current collectors 110 and the tab connecting piece 200 of the second tab can be integrally punched into a structure, which helps to improve the production efficiency of the second tab, and the connection between the two current collectors 110 of the second tab is more firm and is not affected by the welding quality, so that the electrical connection quality between the two current collectors 110 of the second tab is higher; at the same time, the empty foil area 130 of the second tab is in a concave structure, so that when the welding part of the second tab 160 is welded to the empty foil area 130 of the second tab, the length of the part of the second tab 160 located outside the current collector 110 is shorter, and the tab welding area of the first tab 300 can be arranged at a position corresponding to the cutting avoidance area 140 of the first tab 300 and the second tab, so that when the first tab 300 is welded to the tab welding area of the first tab 300, the tab welding part of the first tab 310 is located inside the first tab 300, so that the length of the part of the first tab 310 located outside the first tab 300 is shorter, so that the first tab 300 and the second tab can be made longer under the condition that the width of the first tab 300 and the second tab is unchanged, the overall length of the first tab 300 and the first tab 310 is unchanged, and the overall length of the second tab and the second tab 160 is unchanged, thereby increasing the length of the first tab 300 and the second tab, so that the surface of the first tab 300 and the second tab can be coated with more active substances, which helps to improve the energy density of the electrode core.

[0044] With reference to Figures 3 to 6 In the embodiment, the structure of the first tab 300 is the same as that of the tab main body 100, that is, the structure of the first tab 300 and the second tab is the same, one current collector 110 of the first tab 300 is stacked between the two current collectors 110 of the second tab, and the other current collector 110 of the first tab 300 is reversely attached to the upper surface or the lower surface of one current collector 110 of the second tab, and the diaphragm 400 is arranged between the two adjacent current collectors 110 along the stacking direction of the first tab 300 and the second tab.

[0045] The stacking process of the first tab 300 and the second tab of the battery cell of the embodiment is as follows: one current collector 110 of the second tab is laid flat, the first separator 400 is laid, one current collector 110 of the first tab 300 is laid on the upper surface of the first separator 400, the second separator 400 is laid on the upper surface of the current collector 110 of the first tab 300, another current collector 110 of the second tab is turned up and stacked on the upper surface of the second separator 400, the third separator 400 is placed on the upper surface of the another current collector 110 of the second tab, and finally another current collector 110 of the first tab 300 is turned up and stacked on the upper surface of the third separator 400, at this time, the empty foil area 130 of the first tab 300 overlaps the cutout avoidance area 140 of the second tab, and the empty foil area 130 of the second tab overlaps the cutout avoidance area 140 of the first tab 300, so as not to affect the welding of the first tab 300 and the first tab 310, and not to affect the second tab and the second tab 160.

[0046] It should be noted that the three separators 400 described above can be three independent components, or the three separators 400 can be composed of a continuous film material by folding, which can be determined according to actual needs.

[0047] Referring to Figures 1 to 7 The lithium battery (sometimes also referred to as a lithium battery in the following embodiments) of some embodiments of the utility model, a lithium battery, comprising a shell 500, the inside of the shell 500 is placed with the above-mentioned battery cell. In the embodiment, the shell 500 is a soft package shell, specifically, the shell 500 is an aluminum plastic film packaging bag.

[0048] Since the lithium battery of the embodiment adopts the above-mentioned battery cell, the lithium battery of the embodiment has the advantages of the above-mentioned battery cell, which will not be described here.

[0049] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0050] The above embodiments are described in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, within the knowledge range of ordinary skilled in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. A pole piece, characterized in that, The pole piece comprises a pole piece body (100), the pole piece body (100) comprises two pieces of spaced collector (110) and pole piece connecting piece (200), the surface of each collector (110) is provided with active material coating layer (120), empty foil area (130) and cutting avoidance area (140), the shape of the cutting avoidance area (140) is same with the shape of the empty foil area (130), the cutting avoidance area (140) and the empty foil area (130) are arranged on the two sides of one end of the collector (110) at intervals, the empty foil area (130) is arranged by extending from the circumference of the collector (110) to the inside of the collector (110), the pole piece connecting piece (200) is located between the two pieces of collector (110), and the two ends of the pole piece connecting piece (200) are connected with the two pieces of collector (110) one by one, the pole piece connecting piece (200) and the two pieces of collector (110) are integrally punched and formed. Wherein, when the two pieces of collector (110) are reversely attached to each other, the two empty foil areas (130) overlap each other, and the two cutting avoidance areas (140) overlap each other.

2. The pole piece according to claim 1, wherein the empty foil area (130) is arranged on the side of the collector (110) close to the other collector (110), and the cutting avoidance area (140) is arranged on the side of the collector (110) away from the other collector (110).

3. The pole piece according to claim 1, wherein a notch groove (150) is formed between the side of the empty foil area (130) close to the cutting avoidance area (140) and the collector (110).

4. The pole piece according to claim 1, wherein one end of the pole piece connecting piece (200) is connected to the empty foil area (130) of one of the collectors (110), and the other end of the pole piece connecting piece (200) is connected to the empty foil area (130) of the other collector (110).

5. The pole piece according to claim 1, wherein the distance between the two collectors (110) is L3, and 10mm≥L3≥3mm.

6. The pole piece according to any one of claims 1 to 5, wherein the shape of the empty foil area (130) is rectangular, the length of the empty foil area (130) is L1, and 15mm>L1>10mm, and the width of the empty foil area (130) is L2, and 8mm>L2>5mm. Comprise: ​ ​ ​ ​ 7. An electric cell characterized by ​ A first pole piece (300) and a second pole piece, the second pole piece being the pole body (100) according to any one of claims 1 to 6, the first pole piece (300) being stacked on the upper surface of one of the current collectors (110) of the second pole piece, the other of the current collectors (110) being stacked on the upper surface of the first pole piece (300) upside down, and an insulating diaphragm (400) being arranged between the two current collectors (110) and the first pole piece (300), wherein a first tab (310) is welded at a position corresponding to the cutting avoidance area (140) of the first pole piece (300), and a second tab (160) is welded at the empty foil area (130) of the second pole piece.

8. The battery cell of claim 7, wherein, the structure of the first pole piece (300) is the same as that of the pole body (100), one of the current collectors (110) of the first pole piece (300) is stacked between the two current collectors (110) of the second pole piece, and the other of the current collectors (110) of the first pole piece (300) is attached to the upper surface or the lower surface of one of the current collectors (110) of the second pole piece upside down, along the stacking direction of the first pole piece (300) and the second pole piece, the diaphragm (400) is arranged between the two adjacent current collectors (110).

9. A lithium battery, characterized by A battery cell according to any one of claims 7 or 8 is placed inside a housing (500).

10. A lithium battery according to claim 9, wherein, The housing (500) is a soft package.

Images