Power supply component and method for manufacturing the same

Abstract

The present disclosure relates to a power supply component and a manufacturing method thereof, including a negative electrode sheet, a separator, and a positive electrode sheet; the negative electrode sheet includes a negative electrode tab, and the positive electrode sheet includes a positive electrode tab, a positive electrode material covering a first foil, a first groove, and a second groove; the first groove is formed by removing the positive electrode material covering a first region of the first foil and accommodates the positive electrode tab; the size of the first groove is larger than the size of the positive electrode tab; the second groove is formed by removing the positive electrode material covering a second region of the first foil and accommodates the negative electrode tab; the size of the second groove is larger than the size of the negative electrode tab; and / or, the negative electrode sheet includes a negative electrode material covering a second foil, a third groove, and a fourth groove; the third groove is formed by removing the negative electrode material covering a third region of the second foil and accommodates the positive electrode tab; the size of the third groove is larger than the size of the positive electrode tab; the fourth groove is stacked with the second groove and is formed by removing the negative electrode material covering a fourth region of the second foil and accommodates the negative electrode tab; the size of the fourth groove is larger than the size of the negative electrode tab.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power supplies, and particularly to a power supply component and a manufacturing method thereof. Background Art

[0002] Lithium-ion batteries and the like, as common energy storage components, are widely used in electronic devices. As the demand for electronic devices with longer battery life gradually increases, the configured battery capacity needs to be increased. Generally, the time required to charge a large-capacity battery is relatively long, which is not conducive to improving the user experience.

[0003] In related technologies, the cell structure of the battery is improved by setting multiple tabs to enhance the fast charging performance of the battery. However, when setting multiple tabs in the cell, the welding and bending of the multiple tabs will occupy a large space, resulting in a relatively thick cell thickness, which limits the application of the multiple-tab structure on ultra-thin cells. Moreover, it will also increase the thickness of the electronic device configured with this cell and reduce the portability of the electronic device. Summary of the Invention

[0004] The present disclosure provides a power supply component and a manufacturing method thereof.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a power supply component, including:

[0006] A negative electrode sheet, a separator, and a positive electrode sheet; wherein, an end of the negative electrode sheet includes a negative tab, and an end of the positive electrode sheet includes a positive tab;

[0007] The positive electrode sheet further includes: a first foil, a positive electrode material, a first groove, and a second groove;

[0008] The positive electrode material covers the surface of the first foil;

[0009] The first groove is formed by removing the positive electrode material covering a first region of the first foil, and is used for accommodating the positive tab bent towards the positive electrode sheet; wherein, the size of the first groove is larger than the size of the positive tab;

[0010] The second groove is formed by removing the positive electrode material covering a second region of the first foil, and is used for accommodating the negative tab; wherein, the size of the second groove is larger than the size of the negative tab;

[0011] And / or,

[0012] The negative electrode sheet further includes: a second foil, a negative electrode material, a third groove, and a fourth groove;

[0013] The negative electrode material covers the surface of the second foil;

[0014] The third groove is formed by removing the negative electrode material covering the third region of the second foil, and is used to accommodate the positive electrode tab bent towards the positive electrode sheet; wherein, the size of the third groove is larger than the size of the positive electrode tab;

[0015] The fourth groove is formed by removing the negative electrode material covering the fourth region of the second foil, and is used to accommodate the negative electrode tab; wherein, the size of the fourth groove is larger than the size of the negative electrode tab.

[0016] In some embodiments, the power supply assembly further includes:

[0017] A first welding tab, one end of which is stacked and fixedly connected with the positive electrode tab; wherein, the first fixed connection structure formed by the first welding tab and the positive electrode tab is located in the first groove;

[0018] A second welding tab, one end of which is stacked and fixedly connected with the negative electrode tab; wherein, the second fixed connection structure formed by the second welding tab and the negative electrode tab is located in the second groove.

[0019] In some embodiments, the part of the first fixed connection structure extending from the first region is bent towards the side surface of the first foil;

[0020] The part of the second fixed connection structure extending from the second region is bent towards the side surface of the first foil. In some embodiments, the power supply assembly further includes:

[0021] An elastic first adhesive layer is located between the first fixed connection structure and the first region, and is used to bond the first fixed connection structure and the first foil;

[0022] An elastic second adhesive layer is located between the second fixed connection structure and the second region, and is used to bond the second fixed connection structure and the first foil.

[0023] In some embodiments, the power supply assembly further includes:

[0024] A first insulating layer covers the surface of the first fixed connection structure;

[0025] A second insulating layer covers the surface of the second fixed connection structure.

[0026] According to the second aspect of the embodiments of the present disclosure, a method for manufacturing a power supply assembly is provided, including:

[0027] Cover a positive electrode material on the surface of the first foil to form a positive electrode sheet; cover a negative electrode material on the surface of the second foil to form a negative electrode sheet; wherein, the end of the positive electrode sheet includes a positive electrode tab, and the end of the negative electrode sheet includes a negative electrode tab;

[0028] Wind the negative electrode sheet, the separator, and the positive electrode sheet;

[0029] Before winding the negative electrode sheet, the separator, and the positive electrode sheet, the method further includes:

[0030] Remove the positive electrode material covering the first region of the first foil on the positive electrode sheet to form a first groove; wherein, the first groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, and the size of the first groove is larger than the size of the positive electrode tab; remove the positive electrode material covering the second region of the first foil on the positive electrode sheet to form a second groove; wherein, the second groove is used to accommodate the negative electrode tab, and the size of the second groove is larger than the size of the negative electrode tab;

[0031] and / or,

[0032] Remove the negative electrode material covering the third region of the second foil on the negative electrode sheet to form a third groove; wherein, the third groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, and the size of the third groove is larger than the size of the positive electrode tab; remove the negative electrode material covering the fourth region of the second foil on the negative electrode sheet to form a fourth groove; wherein, the fourth groove is used to accommodate the negative electrode tab, and the size of the fourth groove is larger than the size of the negative electrode tab.

[0033] In some embodiments, the method further includes:

[0034] Fix one end of the first welding tab and the positive electrode tab to form a first fixed connection structure;

[0035] Fix one end of the second welding tab and the negative electrode tab to form a second fixed connection structure;

[0036] Bend the first fixed connection structure towards the first groove to fix the positive electrode tab in the first groove;

[0037] Bend the second fixed connection structure towards the second groove to fix the negative electrode tab in the second groove.

[0038] In some embodiments, bending the first fixed connection structure towards the first groove includes: bending the part of the first fixed connection structure extending from the first region towards the side of the first foil;

[0039] Bending the second fixed connection structure towards the second groove includes: bending the part of the second fixed connection structure extending from the second region towards the side of the first foil.

[0040] In some embodiments, fixing the positive electrode tab in the first groove includes: fixedly connecting the first fixed connection structure and the first region by using an elastic first adhesive layer;

[0041] Fixing the negative electrode tab in the second groove includes: connecting the second fixed connection structure and the second region by using an elastic second adhesive layer.

[0042] In some embodiments, the method further includes:

[0043] After forming the first fixed connection structure, forming a first insulating layer covering the surface of the first fixed connection structure; after forming the second fixed connection structure, forming a second insulating layer covering the surface of the second fixed connection structure;

[0044] Bending the first fixed connection structure towards the first groove includes: bending the first fixed connection structure with the first insulating layer covering its surface towards the first groove;

[0045] Bending the second fixed connection structure towards the second groove includes: bending the second fixed connection structure with the second insulating layer covering its surface towards the second groove.

[0046] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0047] In the power supply assembly provided by the embodiments of the present disclosure, by forming the above-mentioned first groove and / or third groove to place the positive electrode tab bent towards the positive electrode sheet, the increase in the thickness of the power supply assembly caused by the positive electrode tab bent towards the positive electrode sheet can be offset. And, by forming the above-mentioned second groove and / or fourth groove to place the negative electrode tab, the increase in the thickness of the power supply assembly caused by the bent negative electrode tab can be offset. That is, by forming the first groove and the second groove, and / or, by forming the third groove and the fourth groove, the thickness of the power supply assembly can be reduced, providing a solution for the application of the multi-pole ear structure in ultra-thin battery cells, which is beneficial to expanding the application range of the multi-pole ear structure.

[0048] Moreover, by accommodating the bent positive electrode tab in the first groove and / or third groove, and accommodating the bent negative electrode tab in the second groove and / or fourth groove, the occupied space of the power supply assembly by the bent positive electrode tab and negative electrode tab is reduced, which is beneficial to reducing the volume of the power supply assembly, thereby increasing the battery energy density, reducing the thickness of the electronic device equipped with the power supply assembly, and improving the portability of the electronic device.

[0049] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Description of the Drawings

[0050] The accompanying drawings here are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0051] Figure 1a and Figure 1b are partial schematic views of a battery shown according to an exemplary embodiment.

[0052] Figure 2 is a schematic view of a power supply assembly shown according to an exemplary embodiment.

[0053] Figure 3 is a schematic view of another power supply assembly shown according to an exemplary embodiment.

[0054] Figure 4 is a schematic view of yet another power supply assembly shown according to an exemplary embodiment.

[0055] Figure 5 is a cross-sectional schematic view of yet another power module shown according to an exemplary embodiment.

[0056] Figure 6a is a flowchart of a method for manufacturing a power supply assembly shown according to an exemplary embodiment.

[0057] Figure 6b is a flowchart of another method for manufacturing a power supply assembly shown according to an exemplary embodiment.

[0058] Figure 7a , Figure 7b and Figure 7c are schematic views of a method for manufacturing a power supply assembly shown according to an exemplary embodiment. Detailed Description of the Embodiments

[0059] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0060] Figure 1a and Figure 1b show a schematic view of a battery having a multi-tab structure. In combination with Figure 1a and Figure 1b as shown, the battery includes: a bare cell body, welded tabs, and tab glue. The bare cell body includes a wound core (not shown), a negative copper foil, a separator, and a positive aluminum foil. Figure 1aA partial schematic diagram of the battery is shown when the negative copper foil, separator, and positive aluminum foil are in the unfolded state. Figure 1b A schematic diagram of the battery is shown when the negative copper foil, separator, and positive aluminum foil are wound outside the winding pin.

[0061] Refer to Figure 1a As shown, the positive electrode active material is coated on the positive aluminum foil of the negative copper foil, and multiple positive electrode tabs are provided at the end of the positive aluminum foil. The negative electrode active material is coated on the negative copper foil, and multiple negative electrode tabs are provided at the end of the negative copper foil.

[0062] It should be noted that Figure 1a The adjacent two dotted lines are used to mark the area of one fold. When the negative copper foil, separator, and positive aluminum foil are wound outside the winding pin, one fold corresponds to covering one surface of the winding pin, and the adjacent two folds are stacked.

[0063] Taking the positive aluminum foil as an example, the current needs to be transmitted between the external device and the entire surface of the positive aluminum foil through the positive electrode tab. When only one positive electrode tab is provided on the positive aluminum foil, the path for current transmission between the positive electrode tab and the positive aluminum foil is long, the impedance of the battery cell is large, the charging and discharging speed of the battery cell is reduced, and the heat generated by the battery cell during charging and discharging will increase.

[0064] Refer to Figure 1a As shown, when multiple positive electrode tabs are provided on the positive aluminum foil, compared with only one positive electrode tab provided on the positive aluminum foil, the current can be quickly distributed to the corresponding one fold or the adjacent one fold where each positive electrode tab is provided, shortening the path of current transmission, reducing the impedance of the battery cell, effectively improving the charging speed of the battery cell, and reducing the heat generated by the battery cell during charging and discharging.

[0065] When multiple positive electrode tabs are provided on the positive aluminum foil, when the multiple positive electrode tabs are welded to the positive welding tab, refer to Figure 1b As shown, the welded positive electrode tab and the positive welding tab need to be bent twice so that the welded positive electrode tab and the positive welding tab form a first bending area in an "L" shape and a second bending area in an inverted "V" shape for packaging.

[0066] Moreover, since the unbent welded positive electrode tab and the positive welding tab are relatively sharp, during the collision or shaking that occurs during the use of the battery, the welded positive electrode tab and the positive welding tab are caused to pierce into the bare battery cell body, resulting in battery damage. Therefore, the first bending area formed by the above two bends can play a buffering role to avoid damaging the battery.

[0067] However, after bending the welded positive electrode tab and the positive electrode welding tab together, the thickness of the battery will increase, greatly limiting the application of the multi-tab structure in ultra-thin battery cells. Moreover, after bending the tabs twice at the end of the battery cell, the bent area will increase the occupied head space of the battery. With the size of the bare battery cell remaining unchanged, the volume of the battery formed after packaging will increase, reducing the energy density of the battery.

[0068] Figure 2 is a schematic diagram of a power supply assembly 100 shown according to an exemplary embodiment. Referring to Figure 2 as shown, the power supply assembly 100 includes:

[0069] a negative electrode sheet 110, a separator 120, and a positive electrode sheet 130; wherein, the end of the negative electrode sheet 110 includes a negative electrode tab 111, and the end of the positive electrode sheet includes a positive electrode tab 131;

[0070] The positive electrode sheet further includes: a first foil 132, a positive electrode material 133, a first groove 134, and a second groove 135;

[0071] The positive electrode material covers the surface of the first foil;

[0072] The first groove is formed by removing the positive electrode material covering the first region of the first foil, and is used to accommodate the positive electrode tab bent towards the positive electrode sheet; wherein, the size of the first groove is larger than the size of the positive electrode tab;

[0073] The second groove is formed by removing the positive electrode material covering the second region of the first foil, and is used to accommodate the negative electrode tab; wherein, the size of the second groove is larger than the size of the negative electrode tab.

[0074] The power supply assembly 100 may include a lithium-ion battery.

[0075] The separator is a film layer with selective permeability. Taking the power supply assembly as an example of a lithium-ion battery cell, the separator allows lithium ions to be transmitted between the positive electrode sheet and the negative electrode sheet, but blocks the transmission of electrons between the positive electrode sheet and the negative electrode sheet.

[0076] The constituent material of the first foil may include: a metal, for example, aluminum.

[0077] The positive electrode material may include: active substances such as lithium cobalt oxide (LiCoO2), ternary compounds composed of nickel, manganese, and cobalt, and lithium manganese oxide (LiMn2O4), a conductive agent, and an adhesive, etc.

[0078] The positive electrode material may cover at least one side of the first foil. When the positive electrode material covers the opposite first side and second side of the first foil, only a part of the positive electrode material on the first side or the second side of the first foil may be removed to form the first groove.

[0079] Alternatively, in some embodiments, a portion of the positive electrode material may be removed at positions corresponding to the first region on both the first side and the second side of the first foil to form two first grooves, which are symmetric about the first region.

[0080] It should be emphasized that the size of the first groove is larger than the size of the positive electrode tab, including: the length of the first groove is greater than the length of the positive electrode tab, the width of the first groove is greater than the width of the positive electrode tab, and the depth of the first groove is greater than the thickness of the positive electrode tab.

[0081] The size of the second groove is larger than the size of the negative electrode tab, including: the length of the second groove is greater than the length of the negative electrode tab, the width of the second groove is greater than the width of the negative electrode tab, and the depth of the second groove is greater than the thickness of the negative electrode tab.

[0082] In some embodiments, the end of the positive electrode sheet may include a plurality of positive electrode tabs arranged in parallel, and the end of the negative electrode sheet may include a plurality of negative electrode tabs arranged in parallel.

[0083] Compared with only providing one positive electrode tab at the end of the positive electrode sheet, by arranging a plurality of positive electrode tabs in parallel at the end of the positive electrode sheet in the embodiments of the present disclosure, the transmission path of electric energy in the power supply assembly can be shortened, the impedance of the power supply assembly can be reduced, the heat generation during the charging and discharging process of the power supply assembly can be reduced, and the charging speed of the power supply assembly can be improved.

[0084] Similarly, compared with only providing one negative electrode tab at the end of the negative electrode sheet, by arranging a plurality of negative electrode tabs in parallel at the end of the negative electrode sheet in the embodiments of the present disclosure, the transmission path of electric energy in the power supply assembly can be shortened, the impedance of the power supply assembly can be reduced, the heat generation during the charging and discharging process of the power supply assembly can be reduced, and the charging speed of the power supply assembly can be improved.

[0085] It should be noted that when the positive electrode sheet is provided with a plurality of positive electrode tabs, the sum of the thicknesses of the plurality of positive electrode tabs is less than the depth of the first groove. When the negative electrode sheet is provided with a plurality of negative electrode tabs, the sum of the thicknesses of the plurality of negative electrode tabs is less than the depth of the second groove.

[0086] In the accompanying drawings of the specification, in order to mark the position of the positive electrode tab, different filling marks are used to distinguish the positive electrode tab and the first foil. However, the positive electrode tab and the first foil may be an integral structure, and the constituent materials of the positive electrode tab and the first foil may be the same. In addition, in the accompanying drawings of the specification, in order to mark the position of the positive electrode tab, different filling marks are used to distinguish the positive electrode tab and the positive electrode material. However, the positive electrode material is also coated on the surface of the positive electrode tab.

[0087] Specifically, the positive electrode material may be coated on the surface of the foil layer, and then the foil layer coated with the positive electrode material is cut to form the positive electrode sheet.

[0088] In the embodiments of the present disclosure, by providing the first groove for accommodating the bent positive electrode sheet, the increase in the thickness of the power supply assembly caused by the positive electrode tab bent towards the positive electrode sheet can be offset. Moreover, by accommodating the bent positive electrode tab in the first groove, the space occupied by the bent positive electrode tab in the power supply assembly is reduced.

[0089] Similarly, in the embodiments of the present disclosure, by providing the second groove for accommodating the bent negative electrode sheet, the increase in the thickness of the power supply assembly caused by the bent negative electrode tab can be offset, and the space occupied by the bent negative electrode tab in the power supply assembly is reduced.

[0090] The power supply assembly provided by the embodiments of the present disclosure is beneficial to reducing the thickness of the power supply assembly by providing the first groove and the second groove, providing a solution for the application of the multi-tab structure in an ultra-thin battery cell. Moreover, it can also reduce the space occupied by the bent positive electrode tab and negative electrode tab in the power supply assembly, which is beneficial to reducing the volume of the power supply assembly, thereby improving the battery energy density and the portability of the electronic device configured with the power supply assembly.

[0091] In some embodiments, referring to Figure 3 as shown, the negative electrode sheet 110 further includes: a second foil 112, a negative electrode material 113, a third groove 114, and a fourth groove 115;

[0092] The negative electrode material covers the surface of the second foil.

[0093] The third groove is formed by removing the negative electrode material covering the third region of the second foil, and is used for accommodating the positive electrode tab bent towards the positive electrode sheet; wherein, the size of the third groove is larger than the size of the positive electrode tab.

[0094] The fourth groove is formed by removing the negative electrode material covering the fourth region of the second foil, and is used for accommodating the negative electrode tab; wherein, the size of the fourth groove is larger than the size of the negative electrode tab.

[0095] The constituent material of the second foil may include: a metal, for example, copper.

[0096] The negative electrode material may include: graphite, a conductive agent, an adhesive, etc.

[0097] The negative electrode material may cover at least one side of the second foil. When the negative electrode material covers the opposite first side and second side of the second foil, only a part of the negative electrode material on the first side or the second side of the second foil may be removed to form the third groove.

[0098] Alternatively, in some embodiments, a part of the negative electrode material may be removed at the positions corresponding to the second region on the first side and the second side of the second foil to form two third grooves, and these two third grooves are symmetric about the second region.

[0099] The size of the third groove is larger than that of the positive tab, including: the length of the third groove is greater than the length of the positive tab, the width of the third groove is greater than the width of the positive tab, and the depth of the third groove is greater than the thickness of the positive tab.

[0100] The size of the fourth groove is larger than that of the negative tab, including: the length of the fourth groove is greater than the length of the negative tab, the width of the fourth groove is greater than the width of the negative tab, and the depth of the fourth groove is greater than the thickness of the negative tab.

[0101] It can be understood that, similar to forming the first groove and the second groove on the positive electrode sheet, in the embodiments of the present disclosure, by providing a third groove on the negative electrode sheet for accommodating the bent positive electrode sheet, the increase in the thickness of the power supply assembly caused by the positive tab bent towards the positive electrode sheet can be offset. Moreover, by accommodating the bent positive tab in the third groove, the space occupied by the bent positive tab in the power supply assembly is reduced.

[0102] Similarly, in the embodiments of the present disclosure, by providing a fourth groove for accommodating the bent negative electrode sheet, the increase in the thickness of the power supply assembly caused by the bent negative tab can be offset, and the space occupied by the bent negative tab in the power supply assembly is reduced.

[0103] The power supply assembly provided by the embodiments of the present disclosure, by providing the third groove and the fourth groove, is beneficial to reducing the thickness of the power supply assembly, providing a solution for the application of the multi-tab structure in ultra-thin battery cells. Moreover, it can also reduce the space occupied by the bent positive tab and negative tab in the power supply assembly, which is beneficial to reducing the volume of the power supply assembly, thereby improving the battery energy density and the portability of the electronic device configured with the power supply assembly.

[0104] In some embodiments, the power supply assembly may include the first groove and the third groove at the same time, and include the second groove and the fourth groove at the same time, and the third groove and the first groove are stacked, and the fourth groove and the second groove are stacked.

[0105] In the embodiments of the present disclosure, by providing a third groove stacked with the first groove and a fourth groove stacked with the second groove on the negative electrode sheet, the spaces provided by the first groove and the third groove can both be used to accommodate more positive electrode sheets, and the spaces provided by the second groove and the fourth groove can both be used to accommodate more negative electrode sheets, which is beneficial to increasing the space volume for accommodating the positive electrode sheet and the negative electrode sheet. Furthermore, the number of positive electrode sheets and negative electrode sheets provided in the power supply assembly can be further increased while ensuring that the thickness and energy density change ranges of the power supply assembly are relatively small, so as to improve the charge and discharge performance of the power supply assembly.

[0106] In some embodiments, referring to Figure 4 as shown, the power supply assembly further includes:

[0107] The first welding tab 140 has one end stacked and fixedly connected to the positive tab; wherein, the first fixed connection structure formed by the first welding tab and the positive tab is located in the first groove;

[0108] The second welding tab 150 has one end stacked and fixedly connected to the negative tab; wherein, the second fixed connection structure formed by the second welding tab and the negative tab is located in the second groove.

[0109] Exemplarily, one end of the first welding tab can be welded to one end of the positive tab by welding to form the first fixed connection structure. And one end of the second welding tab is welded to one end of the negative tab to form the second fixed connection structure.

[0110] The composition material of the first welding tab may include: aluminum metal. The composition material of the second welding tab may include: nickel metal.

[0111] When the end of the positive electrode sheet includes a plurality of positive tabs, the end of the negative electrode sheet includes a plurality of negative tabs, and the negative electrode sheet, the separator and the positive electrode sheet are wound around the outside of the winding needle to form the bare battery cell 101, the plurality of positive tabs overlap and are stacked, and the plurality of negative tabs coincide and are stacked. It can be understood that the positive tab and the negative tab are located inside the bare battery cell 101.

[0112] Combined Figure 4 and Figure 5 As shown, the end 140a of the first welding tab fixedly connected to the positive tab is located inside the bare battery cell 101, and the other end 140b of the first welding tab is exposed outside the bare battery cell 101 and serves as the positive electrode of the power supply assembly; the end of the second welding tab fixedly connected to the negative tab is located inside the bare battery cell 101, and the other end of the second welding tab is exposed outside the bare battery cell 101 and serves as the negative electrode of the power supply assembly. Here, the other end of the first welding tab is the opposite end of the end where the first welding tab is fixedly connected to the positive tab; the other end of the second welding tab is the opposite end of the end where the second welding tab is fixedly connected to the negative tab.

[0113] The power supply assembly includes a positive electrode and a negative electrode for electrically connecting to an external device. Here, the other end of the first welding tab exposed outside the bare battery cell 101 can be regarded as the positive electrode, and the other end of the second welding tab exposed outside the bare battery cell 101 can be regarded as the negative electrode.

[0114] Exemplarily, the power supply assembly may further include: grid glue 170. When the power supply assembly is encapsulated, the bare battery cell and the aluminum-plastic sealing film can be pasted through the grid glue 170 to increase the connection tightness between the bare battery cell 101 and the aluminum-plastic sealing film, and play a role in protecting the bare battery cell 101.

[0115] It can be understood that when the positive electrode sheet is wound around the outside of the winding needle, the positive electrode sheet can be divided into multiple folds arranged in layers, and two adjacent folds cover two relatively arranged surfaces of the winding needle. In some embodiments, when the positive electrode sheet is wound around the outside of the winding needle, the first groove and the second groove are relatively far away from the winding needle.

[0116] Exemplarily, taking the positive electrode sheet including N (N is an integer greater than 2) folds as an example, when the positive electrode sheet is wound around the outside of the winding needle from the first fold of the positive electrode sheet, the first groove and the second groove can be arranged on the Nth fold of the positive electrode sheet.

[0117] When the positive electrode sheet is wound around the outside of the winding needle and there are other folds between the fold provided with the first groove and the positive electrode tab, the other folds will cover the first groove, and the thickness of the other folds will reduce the volume of the accommodation space formed on the surface of the first battery cell due to the provision of the first groove. This accommodation space is used to accommodate the bent positive electrode tab.

[0118] It can be understood that when the number of folds between the fold provided with the first groove and the Nth fold is less, the volume of the accommodation space formed due to the provision of the first groove is larger, which is more conducive to reducing the increase in the thickness of the power supply assembly caused by the provision of multiple positive electrode tabs.

[0119] In some embodiments, the thickness of the first fixed connection structure is less than the depth of the first groove; the thickness of the second fixed connection structure is less than the depth of the second groove. In this way, the occupation of space of the bent positive electrode tab and negative electrode tab on the power supply assembly can be further reduced, which is beneficial to reducing the volume of the power supply assembly and the thickness of the electronic device configured with this power supply assembly, and improving the portability of the electronic device.

[0120] In some embodiments, referring to Figure 5 As shown, the part of the first fixed connection structure extending from the first region is bent towards the side surface of the first foil; the part of the second fixed connection structure extending from the second region is bent towards the side surface of the first foil.

[0121] Exemplarily, the first fixed connection structure has a first bending part; wherein, the first bending part extends from the first region and is bent towards the side surface of the first foil;

[0122] The second fixed connection structure has a second bending part; wherein, the second bending part extends from the second region and is bent towards the side surface of the first foil.

[0123] Figure 5The first bending portion is shown within the dashed-line frame. In the embodiments of the present disclosure, the portion of the first fixed connection structure extending from the first region is bent towards the side surface of the first foil. When the power supply assembly is stretched or collides, the bent region of the first fixed connection structure can play a buffering role, reducing the risk of breakage of the positive electrode tab and / or the first welded electrode tab due to external force stretching, and reducing the risk of damage to the power supply assembly caused by the positive electrode tab and / or the first welded electrode tab piercing into the bare battery cell due to collision.

[0124] Meanwhile, in the embodiments of the present disclosure, the portion of the second fixed connection structure extending from the second region is bent towards the side surface of the first foil. When the power supply assembly is stretched or collides, the bent region of the second fixed connection structure can play a buffering role, reducing the risk of breakage of the negative electrode tab and / or the second welded electrode tab due to external force stretching, and reducing the risk of damage to the power supply assembly caused by the negative electrode tab and / or the second welded electrode tab piercing into the bare battery cell due to collision.

[0125] In some embodiments, referring to Figure 5 as shown, the power supply assembly further includes: a tab adhesive 190. For the encapsulated power supply assembly, the tab adhesive 190 is located outside the aluminum-plastic film.

[0126] In some embodiments, referring to Figure 5 as shown, the power supply assembly may further include:

[0127] a first insulating layer 191, covering the surface of the first fixed connection structure;

[0128] a second insulating layer, covering the surface of the second fixed connection structure.

[0129] It should be noted that the first insulating layer is used to electrically isolate the first fixed connection structure from other conductive structures in the power supply assembly, and the second insulating layer is used to electrically isolate the second fixed connection structure from other conductive structures in the power supply assembly, avoiding short circuits in the power supply assembly. Other conductive structures in the power supply assembly may include: the positive electrode plate or the negative electrode plate, etc.

[0130] The constituent materials of the first insulating layer 191 and the second insulating layer may include sticky insulating adhesive paper. In some embodiments, referring to Figure 5 as shown, the power supply assembly further includes:

[0131] an elastic first adhesive layer 160, located between the first fixed connection structure and the first region, for bonding the first fixed connection structure and the first foil;

[0132] an elastic second adhesive layer, located between the second fixed connection structure and the second region, for bonding the second fixed connection structure and the first foil.

[0133] The first adhesive layer and the second adhesive layer are electrically insulating. The constituent materials of the first adhesive layer and the second adhesive layer may include: adhesives. For example, grid adhesives.

[0134] In the embodiments of the present disclosure, by providing the first adhesive layer, while preventing the short circuit of the positive electrode tab, the connection tightness between the first fixed connection structure and the first area can be improved, and the reliability degradation of the power supply assembly caused by the displacement of the first fixed connection structure can be reduced. By providing the second adhesive layer, while preventing the short circuit of the negative electrode tab, the connection tightness between the second fixed connection structure and the second area can be improved, and the reliability degradation of the power supply assembly caused by the displacement of the first fixed connection structure can be reduced.

[0135] In addition, since the first adhesive layer and the second adhesive layer are elastic, during the power supply drop process, the first adhesive layer can buffer the mutual pulling between the positive electrode tab and the first welded electrode tab and the first area, and the second adhesive layer can also buffer the mutual pulling between the negative electrode tab and the second welded electrode tab and the second area, reducing the damage of the power supply assembly caused by the large pulling force.

[0136] Figure 6a is a flowchart of a method for manufacturing a power supply assembly shown according to an exemplary embodiment. Refer to Figure 6a As shown, the method includes the following steps:

[0137] S110: Cover the positive electrode material on the surface of the first foil to form a positive electrode sheet; cover the negative electrode material on the surface of the second foil to form a negative electrode sheet; wherein, the end of the positive electrode sheet includes a positive electrode tab, and the end of the negative electrode sheet includes a negative electrode tab;

[0138] S120: Remove the positive electrode material covering the first area of the first foil on the positive electrode sheet to form a first groove; remove the positive electrode material covering the second area of the first foil on the positive electrode sheet to form a second groove; wherein, the first groove is used to accommodate the bent positive electrode tab of the positive electrode sheet, and the size of the first groove is larger than the size of the positive electrode tab; the second groove is used to accommodate the negative electrode tab, and the size of the second groove is larger than the size of the negative electrode tab;

[0139] S130: Wind the negative electrode sheet, the separator, and the positive electrode sheet.

[0140] In the embodiments of the present disclosure, a first groove is formed by removing the positive electrode material covering the first region of the first foil, and the first groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, which can offset the increase in the thickness of the power supply assembly caused by the positive electrode tab bent towards the positive electrode sheet. Moreover, a second groove is formed by removing the positive electrode material covering the second region of the first foil, and the second groove is used to accommodate the negative electrode tab, which can offset the increase in the thickness of the power supply assembly caused by the bent negative electrode tab. That is, the first groove and the second groove can reduce the influence of the bending of the positive electrode tab and the negative electrode tab on the thickness of the battery cell, reduce the thickness of the power supply assembly, provide a solution for the application of the multi-tab structure in the ultra-thin battery cell, and is beneficial to expanding the application scope of the multi-tab structure.

[0141] Moreover, by accommodating the bent positive electrode tab in the first groove and the bent negative electrode tab in the second groove, the occupied space of the bent positive electrode tab and negative electrode tab in the power supply assembly is reduced, which is beneficial to reducing the volume of the power supply assembly and thus increasing the battery energy density.

[0142] Figure 6b is a flowchart of a manufacturing method of another power supply assembly shown according to an exemplary embodiment. Refer to Figure 6b As shown, the method includes the following steps:

[0143] S110: Cover the positive electrode material on the surface of the first foil to form a positive electrode sheet; cover the negative electrode material on the surface of the second foil to form a negative electrode sheet; wherein, the end of the positive electrode sheet includes a positive electrode tab, and the end of the negative electrode sheet includes a negative electrode tab;

[0144] S220: Remove the negative electrode material covering the third region of the second foil on the negative electrode sheet to form a third groove; remove the negative electrode material covering the fourth region of the second foil on the negative electrode sheet to form a fourth groove; wherein, the third groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, and the size of the third groove is larger than the size of the positive electrode tab; the fourth groove is used to accommodate the negative electrode tab, and the size of the fourth groove is larger than the size of the negative electrode tab;

[0145] S130: Wind the negative electrode sheet, the separator and the positive electrode sheet.

[0146] In the embodiments of the present disclosure, a third groove is formed by removing the negative electrode material covering the third region of the second foil, and the third groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, which can offset the increase in the thickness of the power supply assembly caused by the positive electrode tab bent towards the positive electrode sheet. Moreover, a fourth groove is formed by removing the negative electrode material covering the fourth region of the second foil, and the fourth groove is used to accommodate the negative electrode tab, which can offset the increase in the thickness of the power supply assembly caused by the bent negative electrode tab. That is, the third groove and the fourth groove can reduce the influence of the bending of the positive electrode tab and the negative electrode tab on the thickness of the battery cell, reduce the thickness of the power supply assembly, provide a solution for the application of the multi-tab structure in the ultra-thin battery cell, and is beneficial to expanding the application scope of the multi-tab structure.

[0147] Moreover, the bent positive tab is received in the third groove, and the bent negative tab is received in the fourth groove, reducing the space occupied by the bent positive tab and negative tab in the power supply assembly, facilitating the reduction of the volume of the power supply assembly, and thus increasing the battery energy density.

[0148] It should be noted that, in some embodiments, before S130, the method may simultaneously include the above S120 and S220. Moreover, after S130, the third groove and the first groove are stacked, and the fourth groove and the second groove are stacked.

[0149] In the embodiments of the present disclosure, by providing a third groove stacked with the first groove and a fourth groove stacked with the second groove on the negative electrode sheet, the spaces provided by the first groove and the third groove can both be used to accommodate more positive electrode sheets, and the spaces provided by the second groove and the fourth groove can both be used to accommodate more negative electrode sheets, which is conducive to increasing the space volume for accommodating the positive electrode sheets and negative electrode sheets. Furthermore, when the thickness and energy density change range of the power supply assembly are kept relatively small, the number of positive electrode sheets and negative electrode sheets provided in the power supply assembly can be further increased to improve the charge and discharge performance of the power supply assembly.

[0150] In some embodiments, the method further includes:

[0151] Referring to Figure 7a as shown, one end of the first welding tab is fixedly connected to the positive tab to form a first fixed connection structure.

[0152] One end of the second welding tab is fixedly connected to the negative tab to form a second fixed connection structure;

[0153] Referring to Figure 7b as shown, the first fixed connection structure is bent towards the first groove to fix the positive tab in the first groove;

[0154] The second fixed connection structure is bent towards the second groove to fix the negative tab in the second groove.

[0155] Exemplarily, one end of the first welding tab can be fixedly connected to the positive tab by welding to form a first fixed connection structure. And one end of the second welding tab is fixedly connected to the negative tab by welding to form a second fixed connection structure.

[0156] In the embodiments of the present disclosure, by bending the first fixed connection structure towards the first groove and bending the second fixed connection structure towards the second groove, both the bent first fixed connection structure and the second fixed connection structure include an arc region, which can play a buffering role, facilitating an increase in the activity of the first fixed connection structure and the second fixed connection structure, and reducing the risk of breakage of the first fixed connection structure and the second fixed connection structure during a drop.

[0157] It should be noted that the first fixed connection structure includes a partial area of the positive electrode tab and a partial area of the first welded electrode tab. The second fixed connection structure includes a partial area of the negative electrode tab and a partial area of the second welded electrode tab.

[0158] In some embodiments, the method further includes: after forming the first fixed connection structure, pasting a first insulating layer on the surface of the first fixed connection structure (as Figure 7c shown); after forming the second fixed connection structure, pasting a second insulating layer on the surface of the second fixed connection structure.

[0159] In the embodiments of the present disclosure, by covering the first insulating layer on the surface of the first fixed connection structure and covering the second insulating layer on the second fixed connection structure, the first insulating layer electrically isolates the first fixed connection structure from other conductive structures in the power supply assembly, and the second insulating layer electrically isolates the second fixed connection structure from other conductive structures in the power supply assembly, avoiding short - circuit of the power supply assembly and being beneficial to improving the reliability of the power supply assembly.

[0160] Referring to Figure 7c shown, the method further includes: forming an elastic first adhesive layer in the first groove; forming an elastic second adhesive layer in the second groove. In some embodiments, fixing the positive electrode tab in the first groove includes: using the elastic first adhesive layer to fixedly connect the first fixed connection structure and the first area;

[0161] Fixing the negative electrode tab in the second groove includes: using the elastic second adhesive layer to connect the second fixed connection structure and the second area.

[0162] The first adhesive layer and the second adhesive layer are electrically insulated. The composition materials of the first adhesive layer and the second adhesive layer may include: adhesive. For example, grid adhesive.

[0163] In the embodiments of the present disclosure, by providing the first adhesive layer, while preventing short - circuit of the positive electrode tab, the connection tightness between the first fixed connection structure and the first area can be improved, and the decrease in the reliability of the power supply assembly caused by the deviation of the first fixed connection structure can be reduced. By providing the second adhesive layer, while preventing short - circuit of the negative electrode tab, the connection tightness between the second fixed connection structure and the second area can be improved, and the decrease in the reliability of the power supply assembly caused by the deviation of the first fixed connection structure can be reduced.

[0164] In addition, since the first adhesive layer and the second adhesive layer are elastic, during the power supply drop process, the first adhesive layer can buffer the mutual pulling between the positive electrode tab and the first welded electrode tab and the first area, and the second adhesive layer can also buffer the mutual pulling between the negative electrode tab and the second welded electrode tab and the second area, reducing the damage of the power supply assembly caused by the large pulling force.

[0165] In some embodiments, bending the first fixed connection structure towards the first groove includes: bending the portion of the first fixed connection structure extending from the first region towards the side surface of the first foil;

[0166] Bending the second fixed connection structure towards the second groove includes: bending the portion of the second fixed connection structure extending from the second region towards the side surface of the first foil.

[0167] Specifically, bending the portion of the first fixed connection structure extending from the first region towards the side surface of the first foil can form a first bending portion as shown in Figure 5 the first bending portion shown;

[0168] Bending the portion of the second fixed connection structure extending from the second region towards the side surface of the first foil can form a second bending portion.

[0169] Exemplarily, the first fixed connection structure can be slightly bent to form the first bending portion. The included angle of the first bending portion can be an obtuse angle. Similarly, the included angle presented by the second bending portion can be an obtuse angle.

[0170] In the embodiments of the present disclosure, by bending the portion of the first fixed connection structure extending from the first region towards the side surface of the first foil, when the power supply assembly is stretched or collides, the bent area of the first fixed structure can play a buffering role, reducing the risk of breakage of the positive electrode tab and / or the first welded electrode tab due to external force stretching, and reducing the risk of damage to the power supply assembly caused by the positive electrode tab and / or the first welded electrode tab piercing into the bare battery cell due to collision.

[0171] Moreover, by bending the portion of the second fixed connection structure extending from the second region towards the side surface of the first foil, when the power supply assembly is stretched or collides, the bent area of the second fixed structure can play a buffering role, reducing the risk of breakage of the negative electrode tab and / or the second welded electrode tab due to external force stretching, and reducing the risk of damage to the power supply assembly caused by the negative electrode tab and / or the second welded electrode tab piercing into the bare battery cell due to collision.

[0172] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the embodiments disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

[0173] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A power supply component, characterized in that, Comprising: A negative electrode sheet, a separator and a positive electrode sheet; wherein, an end portion of the negative electrode sheet includes a negative electrode tab, and an end portion of the positive electrode sheet includes a positive electrode tab; The positive electrode sheet further includes: a first foil, a positive electrode material, a first groove and a second groove; The positive electrode material covers the surface of the first foil; The first groove is formed by removing the positive electrode material covering a first region of the first foil, and is used for accommodating the positive electrode tab bent towards the positive electrode sheet; wherein, the size of the first groove is larger than the size of the positive electrode tab; The second groove is formed by removing the positive electrode material covering a second region of the first foil, and is used for accommodating the negative electrode tab; wherein, the size of the second groove is larger than the size of the negative electrode tab; And / or, The negative electrode sheet further includes: a second foil, a negative electrode material, a third groove and a fourth groove; The negative electrode material covers the surface of the second foil; The third groove is formed by removing the negative electrode material covering a third region of the second foil, and is used for accommodating the positive electrode tab bent towards the positive electrode sheet; wherein, the size of the third groove is larger than the size of the positive electrode tab; The fourth groove is formed by removing the negative electrode material covering a fourth region of the second foil, and is used for accommodating the negative electrode tab; wherein, the size of the fourth groove is larger than the size of the negative electrode tab; A first welded tab, one end of which is stacked and fixedly connected with a plurality of the positive electrode tabs, and the other end of which is exposed outside the positive electrode sheet and serves as the positive electrode of the power supply assembly; wherein, a plurality of the positive electrode tabs overlap and are stacked, and a first fixed connection structure formed by the first welded tab and the positive electrode tab is located in the first groove; A second welded tab, one end of which is stacked and fixedly connected with a plurality of the negative electrode tabs, and the other end of which is exposed outside the negative electrode sheet and serves as the negative electrode of the power supply assembly; wherein, a plurality of the negative electrode tabs overlap and are stacked, and a second fixed connection structure formed by the second welded tab and the negative electrode tab is located in the second groove; Wherein, the thickness of the first fixed connection structure is less than the depth of the first groove; the thickness of the second fixed connection structure is less than the depth of the second groove.

2. The power supply assembly according to claim 1, wherein A part of the first fixed connection structure extending from the first region is bent towards the side surface of the first foil; A part of the second fixed connection structure extending from the second region is bent towards the side surface of the first foil.

3. The power supply component according to claim 1, characterized in that, The power supply assembly further includes: An elastic first adhesive layer located between the first fixed connection structure and the first region, and used for bonding the first fixed connection structure and the first foil; An elastic second adhesive layer located between the second fixed connection structure and the second region, and used for bonding the second fixed connection structure and the first foil.

4. The power supply assembly according to claim 1, characterized in that, The power supply assembly further includes: A first insulating layer covering the surface of the first fixed connection structure; A second insulating layer covering the surface of the second fixed connection structure.

5. A manufacturing method of a power supply component, characterized in that, The method includes: Cover the positive electrode material on the surface of the first foil to form a positive electrode sheet; cover the negative electrode material on the surface of the second foil to form a negative electrode sheet; wherein, the end of the positive electrode sheet includes a positive electrode tab, and the end of the negative electrode sheet includes a negative electrode tab; Wind the negative electrode sheet, the separator and the positive electrode sheet; Before winding the negative electrode sheet, the separator and the positive electrode sheet, the method further includes: Remove the positive electrode material covering the first region of the first foil on the positive electrode sheet to form a first groove; wherein, the first groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, and the size of the first groove is larger than the size of the positive electrode tab; remove the positive electrode material covering the second region of the first foil on the positive electrode sheet to form a second groove; wherein, the second groove is used to accommodate the negative electrode tab, and the size of the second groove is larger than the size of the negative electrode tab; and / or, Remove the negative electrode material covering the third region of the second foil on the negative electrode sheet to form a third groove; wherein, the third groove is used to accommodate the positive electrode tab bent towards the positive electrode sheet, and the size of the third groove is larger than the size of the positive electrode tab; remove the negative electrode material covering the fourth region of the second foil on the negative electrode sheet to form a fourth groove; wherein, the fourth groove is used to accommodate the negative electrode tab, and the size of the fourth groove is larger than the size of the negative electrode tab; Stack one end of the first welding pole tab and a plurality of the positive electrode tabs and fixedly connect them to form a first fixed connection structure; and expose the other end of the first welding pole tab outside the positive electrode sheet and use it as the positive electrode of the power supply assembly; wherein, a plurality of the positive electrode tabs overlap and are stacked; Stack one end of the second welding pole tab and a plurality of the negative electrode tabs and fixedly connect them to form a second fixed connection structure; and expose the other end of the second welding pole tab outside the negative electrode sheet and use it as the negative electrode of the power supply assembly; wherein, a plurality of the negative electrode tabs overlap and are stacked; Bend the first fixed connection structure towards the first groove to fix the positive electrode tab in the first groove; Bend the second fixed connection structure towards the second groove to fix the negative electrode tab in the second groove; Wherein, the thickness of the first fixed connection structure is less than the depth of the first groove; the thickness of the second fixed connection structure is less than the depth of the second groove.

6. The method according to claim 5, wherein Bending the first fixed connection structure towards the first groove includes: bending the part of the first fixed connection structure extending from the first region towards the side surface of the first foil; Bending the second fixed connection structure towards the second groove includes: bending the part of the second fixed connection structure extending from the second region towards the side surface of the first foil.

7. The method according to claim 5, wherein Fixing the positive electrode tab in the first groove includes: fixedly connecting the first fixed connection structure and the first region by using a first adhesive layer with elasticity; Fixing the negative electrode tab in the second groove includes: using an elastic second adhesive layer to connect the second fixing connection structure and the second region.

8. The method according to claim 5, characterized in that, The method further includes: After forming the first fixing connection structure, forming a first insulating layer covering the surface of the first fixing connection structure; after forming the second fixing connection structure, forming a second insulating layer covering the surface of the second fixing connection structure; Bending the first fixing connection structure towards the first groove includes: bending the first fixing connection structure with the first insulating layer covering its surface towards the first groove; Bending the second fixing connection structure towards the second groove includes: bending the second fixing connection structure with the second insulating layer covering its surface towards the second groove.

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