Battery cell and battery

Abstract

The utility model provides a battery cell and a battery, the battery cell comprises a positive plate, a negative plate and a diaphragm, and the positive plate comprises a positive overlapping part and a positive lug part; the negative plate comprises a negative overlapping part and a negative lug part; the diaphragm, the positive electrode overlapping part and the negative electrode overlapping part are mutually stacked to form a main body, the diaphragm separates the positive electrode overlapping part and the negative electrode overlapping part, the positive electrode lug part and the negative electrode lug part both protrude out of the edge of the diaphragm, and the positive electrode lug part and the negative electrode lug part are located at the two ends of the main body respectively in the width direction of the main body. As the positive lug part and the negative lug part of the battery cell are respectively positioned at the two ends of the main body in the width direction, the transmission distance of charges is shorter when the charges are transferred between the lug parts and the central area of the main body, and the movement time of the charges is shorter, so that the charging rate of the battery cell is higher.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery. Background Technology

[0002] In existing technology, positive and negative electrodes can be constructed by staggering the positive and negative electrodes. In this configuration, the width of the electrodes is the same as the width of the main body of the electrode, resulting in wider electrodes and faster charge transfer. Therefore, this type of battery cell has a high charging speed. However, despite the high charge / discharge rate of the aforementioned battery cell, as users' demands for faster charging speeds of electronic devices gradually increase, the current charging rate of the battery cell is insufficient to meet user needs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell with a high charging speed.

[0004] This utility model also proposes a battery including the above-mentioned battery cells.

[0005] A battery cell according to a first aspect of the present invention includes: a positive electrode sheet including a positive electrode overlapping portion and a positive electrode tab; a negative electrode sheet including a negative electrode overlapping portion and a negative electrode tab; and a separator, wherein the separator, the positive electrode overlapping portion, and the negative electrode overlapping portion are stacked on top of each other to form a main body, the separator separating the positive electrode overlapping portion and the negative electrode overlapping portion, and the positive electrode tab and the negative electrode tab both protrude beyond the edge of the separator. In the width direction of the main body, the positive electrode tab and the negative electrode tab are respectively located at both ends of the main body.

[0006] The battery cell according to the first aspect of this utility model has at least the following beneficial effects: In the prior art, the positive and negative electrode tabs are located at both ends of the main body along its length, which results in a longer transmission distance for charge transfer between the tabs and the central region of the main body, thus leading to a longer charge movement time and consequently a slower charging rate. In contrast, the positive and negative electrode tabs of this utility model are located at both ends of the main body along its width, resulting in a shorter transmission distance for charge transfer between the tabs and the central region of the main body, and a shorter charge movement time, thus leading to a faster charging rate.

[0007] According to some embodiments of the present invention, the width of the main body is W, the dimension of the positive electrode ear in the length direction of the main body is L1, the dimension of the negative electrode ear in the length direction is L2, the stacking direction of the positive electrode overlapping part and the negative electrode overlapping part is the thickness direction of the main body, and any two of the length direction, the width direction and the thickness direction are perpendicular to each other; wherein, L1 > W and L2 > W.

[0008] According to some embodiments of the present invention, in the length direction, the size of the positive electrode overlapping portion is the same as the size of the positive electrode ear portion; and / or, in the length direction, the size of the negative electrode overlapping portion is the same as the size of the negative electrode ear portion.

[0009] According to some embodiments of the present invention, the battery cell includes multiple positive electrode sheets and multiple negative electrode sheets. The battery cell further includes: a positive electrode adapter assembly, including a positive electrode adapter strip and a positive electrode adapter tab. The positive electrode adapter strip includes a first portion and a second portion. The first portion is located at one end of the main body in the width direction and is electrically connected to all the positive electrode tabs. The second portion and the positive electrode adapter tabs are electrically connected and are both located at one end of the main body in the length direction. The negative electrode adapter assembly includes a negative electrode adapter strip and a negative electrode adapter tab. The negative electrode adapter strip includes a third portion and a fourth portion. The third portion is located at one end of the main body in the width direction and is electrically connected to all the negative electrode tabs. The fourth portion and the negative electrode adapter tabs are electrically connected and are both located at one end of the main body in the length direction. In the length direction, the negative electrode adapter tabs and the positive electrode adapter tabs are located at the same end of the main body.

[0010] According to some embodiments of the present invention, the first part is welded to the positive electrode tab, and the battery cell further includes a first protective adhesive, which is disposed on the side of the first part opposite to the positive electrode tab; and / or, the third part is welded to the negative electrode tab, and the battery cell further includes a second protective adhesive, which is disposed on the side of the third part opposite to the negative electrode tab.

[0011] According to some embodiments of the present invention, in the length direction, the size of the first portion is the same as the size of the positive electrode ear; and / or, in the length direction, the size of the third portion is the same as the size of the negative electrode ear.

[0012] According to some embodiments of the present invention, in the thickness direction, the size of the first portion is smaller than the thickness of the main body; and / or, in the thickness direction, the size of the third portion is smaller than the thickness of the main body.

[0013] According to some embodiments of the present invention, the thickness of the main body is H, and in the width direction, the distance by which the positive electrode ear protrudes relative to the diaphragm is T1, and the distance by which the negative electrode ear protrudes relative to the diaphragm is T2; wherein, H≤T1≤2H, and / or, H≤T2≤2H.

[0014] According to some embodiments of the present invention, the battery cell includes multiple positive electrode sheets, multiple negative electrode sheets, and a separator. The separator is folded and includes multiple partitions. The partitions, the positive electrode overlapping portions, and the negative electrode overlapping portions are stacked on top of each other. Each partition separates one positive electrode overlapping portion and one negative electrode overlapping portion.

[0015] The battery according to a second aspect embodiment of the present invention includes a cell as described in any one of the first aspect embodiments.

[0016] 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

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram of a battery cell according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the two adapter components in the diagram;

[0020] Figure 3 for Figure 1 The cross-sectional view of the battery cell shown is omitted (two adapter components are omitted).

[0021] Figure 4 for Figure 1 A top view of the battery cell shown (two adapter components omitted).

[0022] Figure 5 This is a top view of a battery cell in the prior art.

[0023] Reference numerals: 101-cell, 102-body, 103-positive electrode tab, 104-negative electrode tab, 105-second protective adhesive, 106-positive electrode adapter assembly, 107-positive electrode adapter strip, 108-positive electrode adapter tab, 109-negative electrode adapter assembly, 110-negative electrode adapter strip, 111-negative electrode adapter tab, 112-first part, 113-second part, 114-third part, 115-fourth part, 116-positive electrode sheet, 117-negative electrode sheet, 118-separator, 119-separator section, 120-positive electrode overlapping part, 121-negative electrode overlapping part. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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. The use of "first" and "second" in the description is merely for 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.

[0027] 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.

[0028] Figure 1 A battery cell 101 according to an embodiment of the present invention is shown. Figure 3 A cross-section of cell 101 is shown; cell 101 is a laminated cell. Figure 3 As shown, the battery cell 101 includes a positive electrode 116, a negative electrode 117, and a separator 118. The positive electrode 116 includes an interconnected positive electrode overlap portion 120 and a positive electrode tab 103, and the negative electrode 117 includes an interconnected negative electrode overlap portion 121 and a negative electrode tab 104. The positive electrode 116 can be formed by coating a positive electrode active material onto a positive electrode current collector. The positive electrode tab 103 is part of the positive electrode current collector and does not contain any positive electrode active material, while the positive electrode overlap portion 120 includes another part of the positive electrode current collector and the positive electrode active material. Similarly, the negative electrode 117 can be formed by coating a negative electrode active material onto a negative electrode current collector. The negative electrode tab 104 is part of the negative electrode current collector and does not contain any negative electrode active material, while the negative electrode overlap portion 121 includes another part of the negative electrode current collector and the negative electrode active material.

[0029] Both the positive electrode tab 103 and the negative electrode tab 104 protrude beyond the edge of the diaphragm 118. The diaphragm 118, the positive electrode overlapping portion 120, and the negative electrode overlapping portion 121 are stacked on top of each other to form the main body 102, as shown below. Figure 1 or Figure 4 As shown, in the width direction of the main body 102, the positive electrode ear 103 and the negative electrode ear 104 are located at both ends of the main body 102.

[0030] The stacking direction of the positive electrode overlapping portion 120 and the negative electrode overlapping portion 121 is the thickness direction of the main body 102, and any two of the length direction, width direction, and thickness direction of the main body 102 are perpendicular to each other. In some embodiments, the length direction of the main body 102 can be a front-to-back direction, the width direction can be a left-to-right direction, and the thickness direction can be a top-to-bottom direction. It should be noted that in this invention, the length of the main body 102 is greater than the width of the main body 102.

[0031] Since the positive electrode ear 103 and the negative electrode ear 104 are located at opposite ends of the width direction of the main body 102, the charging rate of the battery cell 101 in this embodiment is relatively high.

[0032] To facilitate the explanation of why the battery cell 101 in this embodiment has a high charging rate, the battery cell 101 in the prior art will be introduced below. Figure 5 A prior art battery cell 101 is shown, which also has a body 102, a positive electrode tab 103, and a negative electrode tab 104. However, for Figure 5 The battery cell 101 shown has its positive electrode tab 103 and negative electrode tab 104 located at opposite ends of the main body 102 along its length. This results in a longer charge transfer distance between the tabs and the central region of the main body 102, leading to a longer charge movement time and consequently a slower charging rate for the battery cell 101. More specifically, for Figure 5 As shown in the battery cell 101, when the charge is transferred between any electrode tab and the center point of the main body 102, the distance of charge transfer can be regarded as half the length of the main body 102.

[0033] Assumption Figure 4 The main body 102 and Figure 5 The main body 102 is the same in both length and width. Compared with the prior art, the positive electrode 103 and the negative electrode 104 of this embodiment are located at the two ends in the width direction of the main body 102, respectively. The transmission distance of charge when it is transferred between the electrode and the central region of the main body 102 is shorter (this distance can be regarded as half the width of the main body 102), and the movement time of charge is shorter. Therefore, the charging rate of the battery cell 101 is faster.

[0034] like Figure 4As shown, the width of the main body 102 is W, the dimension of the positive electrode ear 103 along the length of the main body 102 is L1, and the dimension of the negative electrode ear 104 along the length of the main body 102 is L2. In some embodiments, the aforementioned three dimensions satisfy the following relationship: L1 > W, and L2 > W. It should be noted that L1 and L2 may be the same or different.

[0035] For ease of description, the "dimension of the positive electrode ear 103 in the length direction of the main body 102" will be referred to as the "width of the positive electrode ear 103" and the "dimension of the negative electrode ear 104 in the length direction of the main body 102" will be referred to as the "width of the negative electrode ear 104". In the above configuration, the widths of both the positive electrode ear 103 and the negative electrode ear 104 in this embodiment are greater than those in the prior art. Specifically, as... Figure 5 As shown, assuming the width of the main body 102 in the prior art is also W, then the maximum value of the width of the positive electrode tab 103 and the negative electrode tab 104 in the prior art is W. However, in this embodiment, the widths of both the positive electrode tab 103 and the negative electrode tab 104 are greater than W. The larger widths of the positive electrode tab 103 and the negative electrode tab 104 are beneficial for reducing the internal resistance of the battery cell 101, thereby improving the charge / discharge rate and charging speed of the battery cell 101.

[0036] like Figure 4 As shown, in some embodiments, the dimensions of the positive electrode overlap 120 and the positive electrode tab 103 can be the same along the length of the main body 102. This allows the width of the positive electrode tab 103 to be close to or even equal to the length of the main body 102, which helps to further reduce the internal resistance of the cell 101, thereby further improving the charge / discharge rate and charging speed of the cell 101. Furthermore, since the positive electrode overlap 120 and the positive electrode tab 103 have the same dimensions along the length of the main body 102, the positive electrode tab 103 can be formed simply by the rectangular positive electrode sheet 116 protruding relative to the outer edge of the separator 118. The shape of the positive electrode tab 103 is relatively simple, and there is no need to process the complex shape of the positive electrode tab 103 through a cutting process during the manufacturing process of the cell 101. This helps to reduce the manufacturing difficulty and cost of the cell 101.

[0037] Similarly, such as Figure 4 As shown, in some embodiments, the dimensions of the negative electrode overlap 121 and the negative electrode tab 104 can be the same along the length of the main body 102. This allows the negative electrode tab 104 to have a larger width, which helps to further reduce the internal resistance of the cell 101, thereby further improving the charge / discharge rate and charging speed of the cell 101. Moreover, the aforementioned arrangement of the negative electrode sheet 117 also helps to reduce the manufacturing difficulty and cost of the cell 101.

[0038] like Figure 3As shown, in some embodiments, the battery cell 101 includes multiple positive electrode sheets 116, multiple negative electrode sheets 117, and a separator 118. With multiple positive electrode sheets 116 and multiple negative electrode sheets 117, the battery cell 101 has multiple stacked positive electrode tabs 103 and multiple stacked negative electrode tabs 104, resulting in a lower internal resistance. The separator 118 itself is folded in a Z-shaped manner and includes multiple separators 119. The separators 119, positive electrode overlaps 120, and negative electrode overlaps 121 are stacked on top of each other, with each separator 119 separating one positive electrode overlap 120 and one negative electrode overlap 121. This arrangement helps reduce the number of separators 118 and improves stacking efficiency.

[0039] like Figure 1 and Figure 2 As shown, in some embodiments, the battery cell 101 further includes a positive electrode adapter assembly 106, which includes a positive electrode adapter strip 107 and a positive electrode adapter tab 108. For example... Figure 2 As shown, the positive electrode adapter strip 107 is bent and includes a first portion 112 and a second portion 113. The first portion 112 is located at one end of the main body 102 in the width direction and is electrically connected to all the positive electrode tabs 103. More specifically, the first portion 112 can be soldered to the positive electrode tab 103, or the first portion 112 can be bonded to the positive electrode tab 103 with conductive adhesive. The second portion 113 is electrically connected to the positive electrode adapter tab 108, and both the second portion 113 and the positive electrode adapter tab 108 are located at one end of the main body 102 in the length direction. The second portion 113 can be soldered to the positive electrode adapter tab 108, or the second portion 113 can be bonded to the positive electrode adapter tab 108 with conductive adhesive. Both the positive electrode adapter strip 107 and the positive electrode adapter tab 108 can be flexible metal foils.

[0040] Similarly, such as Figure 1 and Figure 2 As shown, in some embodiments, the battery cell 101 further includes a negative electrode adapter assembly 109. The negative electrode adapter assembly 109 includes a negative electrode adapter strip 110 and a negative electrode adapter tab 111. The negative electrode adapter strip 110 includes a third portion 114 and a fourth portion 115. The third portion 114 is located at one end of the body 102 in the width direction and is electrically connected to all negative electrode tabs 104. The fourth portion 115 is electrically connected to the negative electrode adapter tab 111, and both are located at one end of the body 102 in the length direction.

[0041] For electronic devices (not shown) that require power from the battery cell 101, the positive and negative terminals of some electronic devices may be located at the same end along the length of the body 102. To accommodate such electronic devices, the battery cell 101 can employ the aforementioned positive terminal adapter 106 and negative terminal adapter 109, with the tabs (positive terminal adapter 108 and negative terminal adapter 111) for connecting the battery cell 101 to the electronic device located at the same end along the length of the body 102. The positive terminal adapter 108 is used to connect to the positive terminal of the electronic device, and the negative terminal adapter 111 is used to connect to the negative terminal of the electronic device. The positive and negative terminals of the electronic device can be solder pads, metal springs, metal contacts, etc.

[0042] In some embodiments, the size of the first portion 112 is the same as the size of the positive electrode tab 103 along the length of the body 102. This results in a larger connection area between the first portion 112 and the positive electrode tab 103, thereby reducing the internal resistance of the cell 101 and increasing the connection strength between the first portion 112 and the positive electrode tab 103. Similarly, the size of the third portion 114 can be the same as the size of the negative electrode tab 104 along the length of the body 102. This results in a larger connection area between the third portion 114 and the negative electrode tab 104, thereby reducing the internal resistance of the cell 101 and increasing the connection strength between the third portion 114 and the negative electrode tab 104.

[0043] In the thickness direction of the main body 102, the size of the first part 112 is smaller than the thickness of the main body 102 to prevent the overall thickness of the battery cell 101 from being too large. Similarly, in order to prevent the overall thickness of the battery cell 101 from being too large, in the thickness direction of the main body 102, the size of the third part 114 is smaller than the thickness of the main body 102.

[0044] When the positive electrode tab 103 is soldered to the first portion 112, the battery cell 101 may further include a first protective adhesive (not shown), which is disposed on the side of the first portion 112 opposite to the positive electrode tab 103. The first protective adhesive may be adhesive tape. The first protective adhesive is used to cover the solder marks generated by soldering the positive electrode tab 103 to the first portion 112, thereby protecting the solder marks and reducing the risk of the connection between the positive electrode tab 103 and the first portion 112 being damaged.

[0045] Similarly, when the negative electrode tab 104 is soldered to the third portion 114, the battery cell 101 may also include a second protective adhesive 105, which is disposed on the side of the third portion 114 opposite to the negative electrode tab 104. The second protective adhesive 105 is used to cover the solder marks generated during the soldering of the negative electrode tab 104 and the third portion 114, thereby protecting the solder marks and reducing the risk of damage to the connection between the negative electrode tab 104 and the third portion 114.

[0046] Furthermore, if the positive electrode adapter tab 108 and the positive electrode adapter band 107 are connected by welding, then the solder joint formed by the welding can also be provided with protective adhesive (not shown). Similarly, if the negative electrode adapter tab 111 and the negative electrode adapter band 110 are connected by welding, then the solder joint formed by the welding can also be provided with protective adhesive (not shown).

[0047] like Figure 3 As shown, in the width direction of the main body 102, the positive electrode tab 103 protrudes a distance T1 relative to the diaphragm 118, and the negative electrode tab 104 protrudes a distance T2 relative to the diaphragm 118. The thickness of the main body 102 is H (H is not marked in the figures). In some embodiments, H≤T1≤2H, and / or, H≤T2≤2H. T1 and T2 can be the same or different, and the specific values ​​of T1 and T2 can be H, 1.1H, 1.2H, 1.3H, 1.4H, 1.5H, 1.6H, 1.7H, 1.8H, 1.9H, 2H, etc. T1 not less than H can prevent the protrusion distance of the positive electrode tab 103 from being too small, thereby preventing the positive electrode tab 103 from being difficult to connect with the first part 112. T1 not greater than 2H can prevent the protrusion distance of the positive electrode tab 103 from being too large, thereby preventing the strength of one end of the cell 101 in the width direction from being too low. Similarly, T2 being not less than H and not greater than 2H facilitates the connection between the negative electrode ear 104 and the third part 114, and prevents the cell 101 from having too low strength and collapsing.

[0048] like Figure 2 As shown, the positive electrode adapter 108 is bent, with one part vertically positioned and connected to the second part 113, and the other part horizontally positioned. The vertical portion of the positive electrode adapter 108 has a thickness dimension of not less than 0.5H and not greater than H. This arrangement prevents the connection area between the positive electrode adapter 108 and the second part 113 from being too small, and also prevents the thickness of the battery cell 101 from being too large. Similarly, the negative electrode adapter 111 is also bent, with one part vertically positioned and connected to the fourth part 115. The vertical portion of the negative electrode adapter 111 has a thickness dimension of not less than 0.5H and not greater than H. This arrangement prevents the area between the negative electrode adapter 111 and the fourth part 115 from being too small, and also prevents the thickness of the battery cell 101 from being too large.

[0049] The cell 101 described above can be used in a battery. For example, the battery is a pouch battery, which, in addition to the cell 101, also includes an aluminum-plastic film (not shown). The main body 102, the positive electrode tab 103, the negative electrode tab 104, a part of the positive electrode adapter assembly 106, and a part of the negative electrode adapter assembly 109 are encapsulated within the aluminum-plastic film, while the positive electrode adapter tab 108 and the negative electrode adapter tab 111 extend beyond the aluminum-plastic film.

[0050] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. An electric cell, characterized by, The application relates to a battery cell. The battery cell comprises: a positive electrode sheet comprising a positive electrode overlap part and a positive electrode tab; a negative electrode sheet comprising a negative electrode overlap part and a negative electrode tab; 2. The electric cell of claim 1, wherein, a separator, the separator, the positive electrode overlap part and the negative electrode overlap part are stacked to form a main body, the separator separates the positive electrode overlap part and the negative electrode overlap part, the positive electrode tab and the negative electrode tab both protrude beyond the edge of the separator, and the positive electrode tab and the negative electrode tab are respectively located at two ends of the main body in the width direction of the main body. The width of the main body is W, the size of the positive electrode tab in the length direction of the main body is L1, the size of the negative electrode tab in the length direction is L2, the stacking direction of the positive electrode overlap part and the negative electrode overlap part is the thickness direction of the main body, and any two of the length direction, the width direction and the thickness direction are perpendicular to each other; 3. The electric cell of claim 2, wherein, wherein L1>W and L2>W. In the length direction, the size of the positive electrode overlap part is the same as that of the positive electrode tab; and / or, 4. The electric cell of claim 1, wherein, In the length direction, the size of the negative electrode overlap part is the same as that of the negative electrode tab. The battery cell comprises a plurality of positive electrode sheets and a plurality of negative electrode sheets, and further comprises: a positive electrode adapter assembly comprising a positive electrode adapter belt and a positive electrode adapter tab, the positive electrode adapter belt comprises a first part and a second part, the first part is arranged at one end of the main body in the width direction and is electrically connected with all the positive electrode tabs, and the second part and the positive electrode adapter tab are electrically connected and are both located at one end of the main body in the length direction thereof; a negative electrode adapter assembly comprising a negative electrode adapter belt and a negative electrode adapter tab, the negative electrode adapter belt comprises a third part and a fourth part, the third part is arranged at one end of the main body in the width direction and is electrically connected with all the negative electrode tabs, and the fourth part and the negative electrode adapter tab are electrically connected and are both located at one end of the main body in the length direction; 5. The electric cell of claim 4, wherein, In the length direction, the negative electrode adapter tab and the positive electrode adapter tab are located at the same end of the main body. The first part is welded with the positive electrode tab, and the battery cell further comprises a first protective adhesive arranged on the side of the first part away from the positive electrode tab; and / or, 6. The electric cell of claim 4, wherein, The third part is welded with the negative electrode tab, and the battery cell further comprises a second protective adhesive arranged on the side of the third part away from the negative electrode tab. In the length direction, the size of the first part is the same as that of the positive electrode tab; and / or, 7. The electric cell of claim 4, wherein, In the length direction, the size of the third part is the same as that of the negative electrode tab. In the thickness direction of the main body, the size of the first part is smaller than the thickness of the main body; and / or, 8. The electric cell of claim 1, wherein, In the thickness direction of the main body, the size of the third part is smaller than the thickness of the main body. The thickness of the main body is H, and in the width direction, the protruding distance of the positive electrode tab relative to the separator is T1, and the protruding distance of the negative electrode tab relative to the separator is T2; wherein H<=T1<=2H and / or H<=T2<=2H.

9. The electric cell of claim 1, wherein, The electric core comprises a plurality of positive electrode sheets, a plurality of negative electrode sheets and a diaphragm, the diaphragm is folded and comprises a plurality of partition parts, the partition parts, the positive electrode overlapping parts and the negative electrode overlapping parts are stacked with each other, and each of the partition parts separates one of the positive electrode overlapping parts and one of the negative electrode overlapping parts.

10. A battery characterized by The electric core as claimed in any one of claims 1 to 9.

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