Battery cell structure, battery and mobile terminal

Abstract

The present disclosure relates to a battery cell structure, a battery and a mobile terminal. The battery cell structure comprises a positive electrode sheet, a negative electrode sheet, and a separator film arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet, the separator film and the negative electrode sheet are sequentially stacked and wound. Along the axial direction of the winding, the first side end of the positive electrode sheet extends towards a first direction, and the second side end of the negative electrode sheet extends towards a second direction, the first direction being opposite to the second direction. A positive electrode tab is connected to the first side end of the positive electrode sheet, and a negative electrode tab is connected to the second side end of the negative electrode sheet. The present disclosure shortens the electronic movement path inside the battery cell, effectively reduces the impedance of the battery cell, improves the charging and discharging rate of the lithium battery, is beneficial to the large-rate charging and discharging performance, effectively reduces the temperature rise, and ensures the reliability of the battery.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to cell structure, battery and mobile terminal. Background Technology

[0002] With the continuous advancement of technology, lithium batteries have been promoted and popularized in consumer electronics and new energy vehicles due to their advantages such as high energy density, long cycle life, high rated voltage, and low self-discharge rate.

[0003] Meanwhile, the ever-increasing demand for high-power charging and discharging has placed higher requirements on the development of battery cells. However, traditional battery cell structures typically have high impedance and high temperature rise, which limits the high-current charging and discharging of the cells. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a cell structure, a battery, and a mobile terminal.

[0005] According to a first aspect of the present disclosure, a battery cell structure is provided, comprising: a positive electrode sheet; a negative electrode sheet; and a separator disposed between the positive electrode sheet and the negative electrode sheet, wherein the positive electrode sheet, the separator sheet, and the negative electrode sheet are sequentially stacked and wound, wherein, along the winding axis, a first side end of the positive electrode sheet extends toward a first direction, and a second side end of the negative electrode sheet extends toward a second direction, the first direction being opposite to the second direction; a positive electrode tab connected to the first side end of the positive electrode sheet; and a negative electrode tab connected to the second side end of the negative electrode sheet.

[0006] In one embodiment, a first connecting surface is formed on the first side end of the positive electrode sheet by electroplating, and the positive electrode tab is connected to the positive electrode sheet through the first connecting surface; a second connecting surface is formed on the second side end of the negative electrode sheet by electroplating, and the negative electrode tab is connected to the negative electrode sheet through the second connecting surface.

[0007] In one embodiment, the first connecting surface covers a portion of the first side end of the positive electrode sheet; and / or, the second connecting surface covers a portion of the second side end of the negative electrode sheet.

[0008] In one embodiment, the positive electrode tab covers a portion of the first side end of the positive electrode sheet; and / or, the negative electrode tab covers a portion of the second side end of the negative electrode sheet.

[0009] In one embodiment, the positive electrode tab and the negative electrode tab have the same structure, both including a main body portion, and multiple notches are provided on one or both sides of the main body portion.

[0010] In one embodiment, the notch is rectangular, triangular, or fan-shaped.

[0011] In one embodiment, the width of the negative electrode sheet is greater than the width of the positive electrode sheet in the axial direction of the winding.

[0012] In one embodiment, the separator covers the area where the positive electrode and the negative electrode overlap.

[0013] In one embodiment, the width of the separator is greater than or equal to the width of the positive electrode sheet in the axial direction of the winding.

[0014] A second aspect of this disclosure provides a battery, comprising: a housing; and a cell structure disposed within the housing, wherein the cell structure is a cell structure according to any embodiment of the first aspect.

[0015] A mobile terminal is provided according to a third aspect of this disclosure, comprising: a body; and a battery disposed on the body, wherein the battery is the battery of the second aspect embodiment described above.

[0016] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0017] This disclosure utilizes a method where the first end of the positive electrode and the second end of the negative electrode extend in opposite directions, effectively creating numerous positive electrode tabs on the positive electrode and numerous negative electrode tabs on the negative electrode. This significantly shortens the electron movement path within the cell, effectively reducing the cell's impedance, improving the charge / discharge rate of the lithium battery, facilitating high-rate charge / discharge performance, effectively reducing temperature rise, and ensuring battery reliability.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] Figure 1 This is a schematic diagram of the cell structure in related technologies.

[0021] Figure 2 In related technologies Figure 1 A schematic diagram of the internal movement of electrons in a battery cell structure.

[0022] Figure 3 This is a schematic diagram of a battery cell structure shown according to an exemplary embodiment of the present disclosure.

[0023] Figure 4 yes Figure 3 A schematic diagram of the unfolded structure of the middle part.

[0024] Figure 5 This is a schematic diagram of the battery cell structure in related technologies.

[0025] Figure 6 This is a schematic diagram of a battery structure according to an exemplary embodiment of the present disclosure.

[0026] Figure 7 This is a schematic diagram of the structure of a mobile terminal according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0027] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0028] This disclosure provides a battery cell structure in which the positive electrode and the negative electrode extend in opposite directions, and positive and negative tabs are connected to the positive and negative electrode sides respectively, thereby shortening the movement path of electrons inside the battery cell to the tabs, effectively reducing the battery cell impedance and improving the charge and discharge rate of the lithium battery.

[0029] The cell structure can be applied to lithium-ion batteries, which are used to provide power to mobile devices. Mobile devices can include mobile phones, tablets, laptops, power banks (such as power banks), wearable devices such as smart bracelets or smartwatches, balance scooters, electric vehicles, and other products.

[0030] Figure 3 This is a schematic diagram illustrating a battery cell structure according to an exemplary embodiment of the present disclosure. Figure 3 As shown, the battery cell structure 100 of this embodiment may include a positive electrode 10, a negative electrode 20, a separator 30, a positive electrode tab 40, and a negative electrode tab (not shown). The positive electrode 10, the separator 30, and the negative electrode 20 are stacked sequentially and wound around the winding axis O to form a core. The separator 30 is disposed between the positive electrode 10 and the negative electrode 20, covering the overlapping area of ​​the positive electrode 10 and the negative electrode 20. Each adjacent two layers of positive electrode 10 and negative electrode 20 are separated by the separator 30. Along the winding axis O (… Figure 3In the left and right directions, the first side end 11 (left end) of the positive electrode 10 extends toward the first direction D1 (left direction), and the second side end 22 (right end) of the negative electrode 20 extends toward the second direction D2 (right direction). The first direction D1 and the second direction D2 are opposite.

[0031] A separator 30 is located between the positive electrode 10 and the negative electrode 20 to separate them and prevent short circuits caused by contact between the two electrodes. The separator 30 has micropores and can be made of a functional polymer material with a nanoscale microporous structure to allow electrolyte ions (such as lithium ions) to pass through. For example, the separator 30 can be a porous polymer such as polyimide (PI), polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), or polycarbonate (PC) that allows lithium ions to pass through.

[0032] Figure 4 yes Figure 3 A schematic diagram of the unfolded structure of the middle section. (See diagram below.) Figure 3 and Figure 4 As shown, a portion of the positive electrode 10 overlaps with a portion of the negative electrode 20. Specifically, the vast majority of the positive electrode 10 overlaps with the vast majority of the negative electrode 20, while a small portion of the positive electrode 10 extends towards a first direction D1 without overlapping with the negative electrode 20, and a small portion of the negative electrode 20 extends towards a second direction D2 without overlapping with the positive electrode 10. Therefore, unlike conventional cell structures where the positive and negative electrodes completely overlap, the negative electrode 20 and the positive electrode 10 in the cell structure 100 of this disclosure are not completely overlapping.

[0033] Specifically, for example, such as Figure 3 and Figure 4As shown, along the winding axis O, the positive electrode 10 includes a first side end 11 (left side in the figure) and a second side end 12 (right side in the figure). The negative electrode 20 includes a first side end 21 (left side in the figure) and a second side end 22 (right side in the figure). The separator 30 includes a left side end 31 and a right side end 32. The first side end 11 of the positive electrode 10 is located to the left of the left side end 31 of the separator 30, and the distance from the left side end 31 is W1. That is, the first side end 11 of the positive electrode 10 extends out of the left side end 31 of the separator 30 in the first direction D1, that is, the projection of the first side end 11 of the positive electrode 10 in the thickness direction of the cell structure 100 is located outside the separator 30. The second side end 12 of the positive electrode 10 is located to the left of the right end 32 of the separator 30, meaning that the second side end 12 of the positive electrode 10 does not extend beyond the right end 32 of the separator 30. In other words, the projection of the second side end 12 of the positive electrode 10 in the thickness direction of the cell structure 100 is located within the separator 30. The first side end 21 of the negative electrode 20 is located to the right of the left end 31 of the separator 30, and the distance from the right end 31 is W2. That is, the first side end 21 of the negative electrode 20 does not extend beyond the left end of the separator 30. In other words, the projection of the first side end 21 of the negative electrode 20 in the thickness direction of the cell structure 100 is located within the separator 30. The second side end 22 of the negative electrode 20 is located to the right of the right side end 32 of the separator 30. That is, the second side end 22 of the negative electrode 20 extends beyond the right side end 32 of the separator 30. In other words, the projection of the second side end 22 of the negative electrode 20 in the thickness direction of the cell structure 100 is outside the separator 30. In other words, along the winding axis O, the positive electrode 10 and the negative electrode 20 are staggered relative to the separator 30, causing partial overlap between the positive electrode 10 and the negative electrode 20. The separator 30 covers the overlapping portion of the positive electrode 10 and the negative electrode 20, preventing a short circuit between them. In other words, after the positive electrode 10, the separator 30, and the negative electrode 20 are wound, only the first side end 11 of the positive electrode 10 extends from the left end of the cell structure 100, and only the second side end 22 of the negative electrode 20 extends from the right end of the cell structure 100.

[0034] A positive electrode tab 40 is connected to the first side end 11 of the positive electrode plate 10 and is electrically connected to the positive electrode plate 10. A negative electrode tab is connected to the second side end 22 of the negative electrode plate 20 and is electrically connected to the negative electrode plate 20. The positive electrode tab 40 and the negative electrode tab are used to connect to a load through a protection circuit board to achieve charging and discharging. For example, the positive electrode tab 40 and the negative electrode tab can be soldered to the first side end 11 of the positive electrode plate 10 and the second side end 22 of the negative electrode plate 20, respectively. In this embodiment, the positive electrode tab 40 can be an aluminum tab. The negative electrode tab can be a nickel tab.

[0035] Figure 1This is a schematic diagram of the cell structure in related technologies. Figure 2 In related technologies Figure 1 A schematic diagram of the internal electronic movement of a battery cell. (See diagram below.) Figure 1 and Figure 2 As shown, in conventional technology, the cell structure 100 uses MTW (Multi-Taper) technology to weld multiple positive electrode tabs 240 onto the positive electrode sheet 210 and multiple negative electrode tabs 250 onto the negative electrode sheet 220. After overlapping and winding the positive electrode sheet 210, negative electrode sheet 220, and separator 230, the multiple positive electrode tabs 240 and multiple negative electrode tabs 250 are respectively overlapped and welded together. Due to the arrangement of multiple positive electrode tabs 240 and multiple negative electrode tabs 250, the movement path of electrons e to the positive and negative electrode tabs is shortened (e.g., ...). Figure 2 As shown in the diagram, the overlap of the multiple tabs (multiple positive tabs 240 and multiple negative tabs 250) after winding is required to be high. This necessitates precise calculation of the positions of the multiple tabs on the electrode sheet before winding. On the one hand, the calculation is complex, and controlling the positions of the multiple tabs is very inconvenient. On the other hand, a high-precision winding machine is required, resulting in high costs. Therefore, this disclosure uses the method of extending the first side end 11 of the positive electrode sheet 10 and the second side end 22 of the negative electrode sheet 20 in opposite directions, which is equivalent to setting countless positive tabs on the positive electrode sheet 10 and countless negative tabs on the negative electrode sheet 20. In this way, the movement path of electrons inside the cell to the positive tabs connected to the first side end 11 of the positive electrode sheet 10 and the negative tabs connected to the second side end 22 of the negative electrode sheet 20 is significantly shortened, effectively reducing the impedance of the cell, improving the charge and discharge rate of the lithium battery, which is beneficial for high-rate charge and discharge performance, and also effectively reducing temperature rise, thus ensuring the reliability of the battery.

[0036] In one embodiment, the first side end 11 of the positive electrode 10 is electroplated to form a first connecting surface (not shown), and the positive electrode tab 40 is connected to the positive electrode 10 through the first connecting surface. The second side end 22 of the negative electrode 20 is electroplated to form a second connecting surface (not shown), and the negative electrode tab is connected to the negative electrode 20 through the second connecting surface.

[0037] In the battery cell structure 100 of this embodiment, the positive electrode tab 40 is connected to the positive electrode sheet 10 via a first connecting surface formed by electroplating on the first side end 11, which increases the contact area between the positive electrode tab 40 and the positive electrode sheet 10. The negative electrode tab is connected via a second connecting surface formed by electroplating on the second side end 22 of the negative electrode sheet 20, which increases the contact area between the negative electrode tab and the negative electrode sheet 20. This effectively reduces impedance, increases the speed at which electrons are conducted to the positive electrode tab 40 and the negative electrode tab, and thus improves the charge and discharge rate of the lithium battery.

[0038] In some embodiments, a first connecting surface on the first side end 11 of the positive electrode 10 covers a portion of the first side end 11 of the positive electrode 10; and / or, a second connecting surface on the second side end 22 of the negative electrode 20 covers a portion of the second side end 22 of the negative electrode 20. That is, the first connecting surface can be formed separately by partial electroplating on the first side end 11 of the positive electrode 10. The second connecting surface can also be formed separately by partial electroplating on the second side end 22 of the negative electrode 20. Furthermore, the first connecting surface can be formed simultaneously with partial electroplating on the first side end 11 of the positive electrode 10.

[0039] Specifically, in one example, the first connecting surface covers a portion of the first side end 11 of the positive electrode 10, and the first connecting surface is formed by local electroplating on a separate part of the first side end 11 of the positive electrode 10. This exposure of the first side end 11 allows electrolyte to penetrate into the cell through the exposed portion, ensuring sufficient wetting of the positive electrode 10 and the negative electrode 20 and guaranteeing normal lithium-ion flow. However, this disclosure is not limited to this. In another example, the second connecting surface can cover a portion of the second side end 22 of the negative electrode 20, i.e., the second connecting surface is formed by local electroplating on a separate part of the second side end 22 of the negative electrode 20. This exposure of the second side end 22 allows electrolyte to penetrate into the cell through the exposed portion, ensuring sufficient wetting of the positive electrode 10 and the negative electrode 20 and guaranteeing normal lithium-ion flow. However, this disclosure is not limited to this. In another example, while the first connecting surface covers a portion of the first side end 11 of the positive electrode 10, the second connecting surface covers a portion of the second side end 22 of the negative electrode 20. That is, while the first connecting surface is formed by partial electroplating on the first side end 11 of the positive electrode 10, the first connecting surface is also formed by partial electroplating on the first side end 11 of the positive electrode 10. This partially exposes the first side end 11 and the second side end 22, allowing the electrolyte to flow into the cell from the first side end 11 and the second side end 22 respectively, enabling the positive and negative electrodes to be more rapidly and fully wetted, and increasing the flow rate of electrons and lithium ions.

[0040] In some embodiments, the positive electrode tab 40 covers a portion of the first side end of the positive electrode 10; and / or, the negative electrode tab covers a portion of the second side end 22 of the negative electrode 20.

[0041] In one example, the positive electrode tab 40 may cover a portion of the first side end 11 of the positive electrode 10. This exposure of the first side end 11 allows the electrolyte to quickly penetrate the interior of the positive electrode 10 through the exposed portion, resulting in more thorough wetting of both the positive and negative electrodes and increasing the flow rate of electrons and lithium ions. However, this disclosure is not limited to this. In another example, the negative electrode tab may cover a portion of the second side end 22 of the negative electrode 20. This exposure of the second side end 22 allows the electrolyte to quickly penetrate the interior of the negative electrode 20 through the exposed portion, resulting in more thorough wetting of both the positive and negative electrodes and increasing the flow rate of electrons and lithium ions. However, this disclosure is not limited to this. In yet another example, the positive electrode tab 40 may cover a portion of the first side end 11 of the positive electrode 10, while the negative electrode tab covers a portion of the second side end 22 of the negative electrode 20. The first side end 11 and the second side end 22 are partially exposed, so that the electrolyte can flow into the cell from the first side end 11 and the second side end 22 respectively, allowing the positive and negative electrode plates to be more fully wetted and increasing the flow rate of electrons and lithium ions.

[0042] In one embodiment, the positive electrode tab 40 and the negative electrode tab have the same structure, both of which can include a main body portion 41, and a plurality of notches 42 are provided on one or both sides of the main body portion 41.

[0043] Multiple notches 42 expose the first side end 11 and the second side end 22, allowing electrolyte to flow into the cell structure through these notches. The notches 42 also temporarily retain the electrolyte, allowing for more thorough absorption and proper wetting of the positive and negative electrode plates. However, the positive and negative electrode tabs 40 can have different structures. To reduce costs, positive and negative electrode tabs with identical structures can be manufactured using a single mold, lowering processing costs. For example, the positive and negative electrode tabs 40 can be fishbone shaped. The notches 42 can be rectangular, triangular, fan-shaped, or other irregular shapes.

[0044] In one embodiment, such as Figure 4As shown, in the direction of the winding axis O, the width Wa of the negative electrode 20 is greater than the width Wc of the positive electrode, that is, the second side end 22 of the negative electrode 20 extends beyond the second side end 12 of the positive electrode 10, i.e., A / C overhang. This ensures that electrons e and lithium ions from the positive electrode 10 can enter the active material particles of the negative electrode 20 after passing through the separator 30, avoiding lithium dendrite formation, which could puncture the separator 30 and cause thermal runaway, thereby improving the safety of the cell structure 100. In the past, in the cell structure 100, the negative electrode 220 needed to extend beyond the positive electrode 210 at both ends of the winding axis O, i.e., both ends of the negative electrode 220 needed to have an A / C overhang with both ends of the positive electrode 210. Since the positive electrode 10 and the negative electrode 20 of the cell structure 100 of this disclosure extend in opposite directions, i.e., the corresponding separator 30 is staggered in the first direction D1 and the second direction D2, only the second side end 22 of the negative electrode 20 needs to extend beyond the second side end 12 of the positive electrode 10, that is, only one end of the negative electrode 20 needs to extend beyond the positive electrode 10. Therefore, compared with the conventional cell structure 100 where both sides of the negative electrode 220 need to extend separately to both sides of the positive electrode, the cell structure 100 of this disclosure can reduce the amount of negative electrode 20 used and save costs when the overlapping area of ​​the positive electrode 10 and the negative electrode 20 is the same.

[0045] Figure 5 This is a schematic diagram of the battery cell structure in related technologies.

[0046] In one embodiment, such as Figure 4 As shown, in the direction of the winding axis O, the width Ws of the separator 30 is greater than or equal to the width Wc of the positive electrode 10. In conventional cell structures 100, the separator 230 needs to be wider than the widths of the positive electrode 210 and the negative electrode 220; that is, conventional cell structures require the separator 230 to extend from both ends of the separator 230 to both ends of the negative electrode 220, i.e., S / A overhang (e.g.) Figure 5 As shown), the separator 30 is used to cover the overlapping area of ​​the positive electrode 210 and the negative electrode 220. Since the side ends of the positive electrode 10 and the negative electrode 20 of the cell structure 100 of this disclosure extend in opposite directions, that is, the corresponding separator 30 is staggered in the first direction D1 and the second direction D2, the separator 30 only needs to cover the overlapping area of ​​the positive electrode 10 and the negative electrode 20, and does not need to extend from the first side end 21 and the second side end 22 of the negative electrode 20 respectively, that is, there is no need for S / A overhang. In this way, compared with the conventional cell structure 100, in the case of the same overlapping area of ​​the positive electrode 10 and the negative electrode 20, the cell structure 100 of this disclosure can save the amount of separator 30 used and save material costs.

[0047] In summary, the battery cell structure 100 disclosed herein can be manufactured by offsetting the positive electrode 10 and the negative electrode 20 relative to the separator 30 along the winding axis O by a certain distance, and then winding them into a bare core structure using a winding machine. As a result, the first side end of the positive electrode 10 extends towards the first direction D1 of the winding axis O, and the second side end of the negative electrode 20 extends towards the second direction D2 of the winding axis O. Then, an electroplating process is used to partially electroplat the first side end 11 of the positive electrode 10 to form a first connecting surface, and to partially electroplat the second side end 22 of the negative electrode 20 to form a second connecting surface. Next, fishbone-shaped positive and negative electrode tabs are welded to the first and second connecting surfaces, respectively. Finally, the bare core is encapsulated in an aluminum-plastic film, and electrolyte is injected into the bare core to form a complete battery cell structure 100.

[0048] Figure 6 This is a schematic diagram of a battery structure according to an exemplary embodiment of the present disclosure. Figure 6 As shown, according to an embodiment of this disclosure, a battery 400 is provided, including a housing 410 and a cell structure 100 disposed within the housing 410. The cell structure 100 is any of the cell structures 100 described in the preceding embodiments. The housing 410 can be a soft-pack housing, such as an aluminum-plastic shell or a soft-pack bag. The housing 410 can also be a rigid housing, such as a metal or plastic shell. The shape of the housing 410 can be cylindrical, cuboid, or cubic, etc. The battery 400 can be a lithium battery, which can be used to provide power to a mobile terminal. The mobile terminal can include mobile phones, tablets, laptops, power banks (such as power banks), wearable devices such as smart bracelets or smartwatches, balance scooters, electric vehicles, and other products.

[0049] The battery 200 of this embodiment extends in opposite directions from the first side end 11 of the positive electrode 10 and the second side end 22 of the negative electrode 20, effectively creating numerous positive electrode tabs on the positive electrode 10 and numerous negative electrode tabs on the negative electrode 20. This significantly shortens the movement path of electrons within the cell to the positive electrode tabs connected to the first side end 11 of the positive electrode 10 and the negative electrode tabs connected to the second side end 22 of the negative electrode 20. This effectively reduces the impedance of the cell structure within the battery 200, improves the charge and discharge rate of the battery 200, facilitates high-rate charge and discharge performance, effectively reduces temperature rise, and ensures battery reliability.

[0050] For example, the battery 200 may also include a protection circuit board, which may be disposed on the open end face of the housing. The positive and negative tabs of the cell structure 100 may be electrically connected to the protection circuit board respectively. The protection circuit board may be connected to the motherboard inside the mobile terminal, and the motherboard is connected to the charging interface. The charging current input to the cell structure and the supply current output from the cell are adjusted by the protection circuit board.

[0051] Figure 7 This is a schematic diagram of the structure of a mobile terminal according to an exemplary embodiment of the present disclosure. Figure 7 As shown, this embodiment of the present disclosure provides a mobile terminal 300 including a body 310 and a battery 200 disposed on the body 310, wherein the battery 200 is the battery 200 mentioned in the above embodiment.

[0052] The main body 310 includes a mid-frame, a battery compartment is provided on the back of the mid-frame for accommodating the battery 200, and a display screen 320 is supported on the front of the mid-frame.

[0053] Mobile terminals can include mobile phones, tablets, laptops, power banks (such as power banks), wearable devices such as smart bracelets or smartwatches, balance bikes, electric vehicles, and other products.

[0054] The mobile terminal 300 of this embodiment, by configuring the battery 200 of this embodiment, can significantly shorten the movement path of electrons inside the cell to the positive electrode tab connected to the first side end 11 of the positive electrode plate 10 and the negative electrode tab connected to the second side end 22 of the negative electrode plate 20 due to the configuration of the cell structure 100 of the battery 200. This effectively reduces the impedance of the cell structure inside the battery 200, improves the charging and discharging rate of the battery 200, is beneficial to high-rate charging and discharging performance, and also effectively reduces temperature rise. The reliability of the battery is also guaranteed. Thus, the mobile terminal 300 of this embodiment can achieve fast charging and meet the demand for high-power discharge, improving the convenience of the mobile terminal 300.

[0055] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0056] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0057] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous. Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0058] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery cell structure, characterized in that, include: A positive electrode sheet, wherein a first connecting surface is formed at the first side end of the positive electrode sheet; The negative electrode sheet has a second connecting surface formed at its second side end. A separator is disposed between the positive electrode and the negative electrode. The positive electrode, the separator, and the negative electrode are stacked and wound in sequence. Along the winding axis, the first side end of the positive electrode extends toward a first direction, and the second side end of the positive electrode contracts toward a second direction relative to the right side end of the separator. The second side end of the negative electrode extends toward a second direction, and the first side end of the negative electrode contracts toward a first direction relative to the left side end of the separator. The first direction is opposite to the second direction. A positive electrode tab is connected to the first connecting surface of the positive electrode sheet, and the first connecting surface intersects the extension direction of the positive electrode sheet; A negative electrode tab is connected to the second connecting surface of the negative electrode sheet, and the second connecting surface intersects the extension direction of the negative electrode sheet. Wherein, the first connecting surface covers a portion of the first side end of the positive electrode sheet; and / or, The second connecting surface covers the second side end of the negative electrode sheet.

2. The cell structure according to claim 1, characterized in that, The first side end of the positive electrode sheet is formed into the first connecting surface by electroplating; The second side end of the negative electrode sheet is electroplated to form the second connection surface.

3. The cell structure according to claim 1, characterized in that, The positive electrode tab covers the first side end of the positive electrode plate; and / or The negative electrode tab covers the second side end of the negative electrode sheet.

4. The cell structure according to claim 3, characterized in that, The positive electrode tab and the negative electrode tab have the same structure, both including a main body, with multiple notches provided on one or both sides of the main body.

5. The cell structure according to claim 4, characterized in that, The shape of the notch can be rectangular, triangular, or fan-shaped.

6. The cell structure according to claim 1, characterized in that, In the axial direction of the winding, the width of the negative electrode is greater than the width of the positive electrode.

7. The cell structure according to claim 1 or 6, characterized in that, The separator covers the area where the positive electrode and the negative electrode overlap.

8. The cell structure according to claim 7, characterized in that, In the axial direction of the winding, the width of the separator is greater than or equal to the width of the positive electrode sheet.

9. A battery, characterized in that, include: case; A cell structure is disposed within the housing, wherein the cell structure is the cell structure as described in any one of claims 1-8.

10. A mobile terminal, characterized in that, include: ontology; A battery is disposed on the body, the battery being the battery as described in claim 9.

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