Battery and battery manufacturing method

Abstract

The present application discloses a battery and a battery manufacturing method. The battery comprises a current collecting assembly and a bare cell. The current collecting assembly comprises a first current collecting part and a second current collecting part, the current collecting assembly defines a first inner cavity, the first current collecting part is provided with a first wall surface, and the second current collecting part is provided with a second wall surface. The bare cell comprises a first electrode sheet group and a second electrode sheet group. Each first electrode sheet comprises two first straight members; the ends of the first straight members close to the second wall surface are connected to each other; the ends of the first straight members close to the first wall surface are respectively connected to the first wall surface; each second electrode sheet comprises two second straight members; the ends of the second straight members close to the first wall surface are connected to each other; and the ends of the second straight members close to the second wall surface are respectively connected to the second wall surface. According to the present application, the current collecting assembly is arranged at one end of the first straight members and one end of the second straight members, so that the stacking process of bare cells adapted to a housing assembly is simplified, and the working efficiency of battery processing is improved.

Description

Battery and battery manufacturing method Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and a battery manufacturing method. Background Art

[0002] In modern society, the use and storage of energy are developing rapidly, especially electrochemical energy storage. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. They have broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] At present, the volume of the negative electrode changes greatly during the discharge process of the battery, making it difficult to effectively suppress the expansion of the soft-pack battery, which brings certain difficulties to the manufacture and application of the battery. In the prior art, by replacing the battery shell with a steel shell with a certain strength, the side frame of the steel shell can be used to suppress expansion, thereby improving the performance and stability of the battery to a certain extent. Generally, a laminated battery with a smaller width is placed upright in the steel shell to form a battery. Therefore, the direction of battery expansion changes from the thickness direction to the width direction, reducing the expansion force so that the side frame of the steel shell can be used to suppress battery expansion. However, due to the small width of the laminated battery electrode, it is quite difficult to manufacture, resulting in high production costs for the battery, which reduces the economic benefits of the battery.

[0004] Summary of the Invention

[0005] The main purpose of this application is to propose a battery and a battery manufacturing method, which aims to solve the technical problem that the stacked battery cells are placed upright in a steel shell, reduce the expansion force, and thus use the side frame of the steel shell to suppress the expansion of the battery cells. This process route is difficult to manufacture due to the narrow width of the electrode.

[0006] To achieve the above objectives, the first aspect of the present application provides a battery, comprising:

[0007] A current collecting assembly, the current collecting assembly comprising a first collecting portion and a second collecting portion, the current collecting assembly defining a first inner cavity, the first collecting portion having a first wall surface, the second collecting portion having a second wall surface, and the first wall surface and the second wall surface being arranged opposite to each other along a first direction;

[0008] A bare cell, the bare cell comprising a first electrode group and a second electrode group, the bare cell being disposed in the first inner cavity, the first electrode group comprising a plurality of first electrode plates having the same polarity, the first electrode plates being arranged one by one in a second direction perpendicular to the first direction, the first electrode plates being connected to the first wall, the second electrode group comprising a plurality of second electrode plates having the same polarity, the second electrode plates having a different polarity from the first electrode plates, the second electrode plates being arranged in an alternating and stacked manner with the first electrode plates, and the second electrode plates being connected to the second wall;

[0009] Among them, the first pole piece includes two first straight parts, and the ends of the first straight parts close to the second wall are connected to each other, and the ends of the first straight parts close to the first wall are respectively connected to the first wall; the second pole piece includes two second straight parts, and the ends of the second straight parts close to the first wall are connected to each other, and the ends of the second straight parts close to the second wall are respectively connected to the second wall.

[0010] In some embodiments, the battery includes a shell assembly, the shell assembly defines a second inner cavity, and the current collecting assembly and the bare cell are disposed in the second inner cavity.

[0011] In some embodiments, the shell assembly includes a pole portion, and along the first direction, the pole portion is arranged on a side of the current collecting assembly away from the bare battery cell.

[0012] In some embodiments, the pole portion includes a first pole and a second pole. Along the second direction, the first pole and the second pole portion are spaced apart from each other. The first pole is connected to the first current collecting portion, and the second pole is connected to the second current collecting portion.

[0013] In some embodiments, along the first direction, the pole portion is arranged on the side of the first current collecting portion away from the second current collecting portion, the second current collecting portion includes a first end portion, the first end portion abuts against the second pole, and the current collecting assembly includes an insulating portion, and the insulating portion is arranged between the first end portion and the first current collecting portion.

[0014] In some embodiments, along the second direction, the second current collecting portion is at least partially located on one side of the bare cell, along the second direction, the bare cell includes a second end, and the insulating portion is partially disposed between the second current collecting portion and the second end.

[0015] In some embodiments, the shell assembly is provided with an air guide channel, the air guide channel is connected to the second inner cavity, and along the second direction, the air guide channel is located on one side of the bare battery cell.

[0016] In some embodiments, the shell assembly includes a sealing portion, which is arranged in the air guide channel to seal the air guide channel. The sealing portion is configured to be pushed away from the air guide channel after obtaining pressure provided by the bare battery cell along the second direction.

[0017] In some embodiments, the first electrode piece is an anode electrode piece, and along the first direction, the gas guide channel is adjacent to one side of the first current collecting portion;

[0018] or,

[0019] The second pole piece is an anode pole piece, and along the first direction, the air guide channel is adjacent to one side of the second current collecting portion.

[0020] In some embodiments, the third direction is set to be perpendicular to the first direction and the second direction, the first electrode piece is an anode electrode piece, and along the third direction, the gas guide channel is adjacent to one side of the first current collecting portion;

[0021] or,

[0022] The third direction is set to be perpendicular to the first direction and the second direction. The second pole piece is an anode pole piece. Along the third direction, the air guide channel is adjacent to one side of the second current collecting portion.

[0023] In some embodiments, the projection plane is a plane perpendicular to the second direction, the air guide channel forms a first orthographic projection on the projection plane, the first collecting portion forms a second orthographic projection on the projection plane, and the first orthographic projection coincides with the second orthographic projection;

[0024] or,

[0025] The projection plane is a plane perpendicular to the second direction, the air guide channel forms a first orthographic projection on the projection plane, the second collecting portion forms a third orthographic projection on the projection plane, and the first orthographic projection coincides with the third orthographic projection.

[0026] In some embodiments, the second inner cavity forms a fourth orthographic projection on the projection plane, the area of ​​the fourth orthographic projection is S, the silicon content of the battery is A, the tensile strength of the shell assembly is M, the number of layers of the anode electrode is C, and the area S, the silicon content A, the number of anode electrode layers C and the tensile strength M satisfy: M≥4A*100*C / S.

[0027] In some embodiments, the area S, the silicon content A, the number of anode sheet layers C, and the tensile strength M satisfy: M>4.4492A*100*C / S.

[0028] In some embodiments, the battery includes a limiting assembly, the limiting assembly is arranged in the second inner cavity, the limiting assembly defines a third inner cavity, the limiting assembly is provided with a first through hole, the axis of the first through hole is parallel to the third direction, the limiting assembly is provided with a second through hole, the axis of the second through hole is parallel to the first direction, the first through hole and the second through hole are connected to the third inner cavity, and the bare battery cell is arranged in the third inner cavity.

[0029] A second aspect of the present application further provides a battery manufacturing method, which is applicable to the battery described in any one of the above embodiments, and includes:

[0030] Laminating the first coated electrode piece and the second coated electrode piece to perform S-shaped lamination and form a laminated portion, wherein the laminated portion includes two opposite bending regions;

[0031] The two bending areas are cut off, the first coated electrode group forms a first cut-off area and a plurality of the first electrode pieces, and the second coated electrode group forms a second cut-off area and a plurality of the second electrode pieces;

[0032] The first current collecting portion is connected to each of the first pole pieces, and the second current collecting portion is connected to each of the second pole pieces to produce the battery.

[0033] In some embodiments, after the step of connecting the first current collecting part and each of the first pole pieces, and connecting the second current collecting part and each of the second pole pieces to produce the battery, the battery manufacturing method further includes: installing the insulating part on the first current collecting part and the second current collecting part.

[0034] In some embodiments, after the step of installing the insulating part on the first current collecting part and the second current collecting part, the battery manufacturing method further includes: placing the current collecting assembly and the bare cell into the shell assembly, and installing the pole part on the side of the shell assembly away from the bare cell along the second direction.

[0035] In some embodiments, after the steps of placing the current collecting assembly and the bare cell into the shell assembly and installing the pole portion on the side of the shell assembly away from the bare cell along the second direction, the battery manufacturing method further includes: welding the shell assembly so that the second inner cavity defined by the shell assembly is separated from the outside world.

[0036] In some embodiments, before the step of stacking the first coated electrode sheet and the second coated electrode sheet to perform S-shaped lamination and form a stacked portion, wherein the stacked portion includes two opposing bending regions, the battery manufacturing method further includes:

[0037] After the anode electrode and the diaphragm are combined, cleaning is performed to form the first coated electrode;

[0038] or,

[0039] After the anode electrode piece and the diaphragm are combined, cleaning is performed to form the second coated electrode piece.

[0040] In some embodiments, before the step of stacking the first coated electrode sheet and the second coated electrode sheet to perform S-shaped lamination and form a stacked portion, wherein the stacked portion includes two opposing bending regions, the battery manufacturing method further includes:

[0041] After coating the anode electrode piece by zebra coating, the anode electrode piece and the separator are composited to form the first coated electrode piece;

[0042] or,

[0043] After coating the anode electrode piece by zebra coating, the anode electrode piece and the separator are composited to form the second coated electrode piece.

[0044] Compared with the prior art, the present invention has the following advantages:

[0045] In the technical solution of the present application, the first electrode piece includes two first straight pieces, and the ends of the first straight pieces close to the second wall are connected to each other, and the ends of the first straight pieces close to the first wall are respectively connected to the first wall. The second electrode piece includes two second straight pieces, and the ends of the second straight pieces close to the first wall are connected to each other, and the ends of the second straight pieces close to the second wall are respectively connected to the second wall. The current collecting assembly is arranged at one end of the first straight piece and one end of the second straight piece through an S-shaped winding method to meet the width requirement of the bare cell along the first direction, reduce the complexity of the bare cell production, reduce the production cost of the battery, and improve the economic benefits of the battery. In addition, the first collecting part and the second collecting part are configured to be conductive, so that when the battery is working, the first collecting part can electrically connect the first electrode pieces, and the second collecting part can electrically connect the second electrode pieces, further improving the discharge efficiency of the battery and ensuring the operating rate of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0047] FIG1 is a schematic cross-sectional view of a battery in a first embodiment of the present application; the diagram shows a pole portion, an air guide channel, and a blocking portion; a current collecting assembly including a first end portion and an insulating portion; a bare cell including a second end portion; and a first pole piece having an anode polarity.

[0048] FIG2 is a schematic cross-sectional view of a battery in a second embodiment of the present application;

[0049] FIG3 is a schematic cross-sectional view of a battery in a third embodiment of the present application; wherein the current collecting assembly includes an insulating portion, and the bare cell includes a second end portion;

[0050] FIG4 is a schematic cross-sectional view of a battery in a fourth embodiment of the present application; wherein the current collecting assembly includes a first end and an insulating portion, and the bare cell includes a second end;

[0051] FIG5 is a schematic cross-sectional view of a battery in a fourth embodiment of the present application; wherein the diagram shows a pole portion, a current collecting assembly including a first end portion and an insulating portion, and a bare cell including a second end portion;

[0052] FIG6 is a schematic cross-sectional view of a battery in a fifth embodiment of the present application; the diagram shows a pole portion, an air guide channel, and a blocking portion; the current collecting assembly includes a first end portion and an insulating portion; the bare cell includes a second end portion; and the polarity of the second pole piece is an anode;

[0053] FIG7 is a schematic cross-sectional view of a battery according to a sixth embodiment of the present application; the figure shows the housing opening; the first electrode piece is an anode electrode piece; along the first direction, the gas guide channel is adjacent to one side of the first current collecting portion; and, along the third direction, the gas guide channel is adjacent to one side of the first current collecting portion;

[0054] FIG8 is a side view of a battery in a seventh embodiment of the present application; wherein the battery includes a limit assembly, and illustrates a third inner cavity and a first through hole;

[0055] FIG9 is a side view of a first type of position limiting assembly according to an embodiment of the present application; wherein the position limiting assembly includes a third inner cavity, a first through hole, and a second through hole;

[0056] FIG10 is a flow chart of a first battery manufacturing method according to an embodiment of the present application;

[0057] FIG11 is a schematic diagram of the stacking portion of the S-shaped stack in the first battery manufacturing method according to an embodiment of the present application; wherein the first coated electrode sheet and the second coated electrode sheet are completed in the S-shaped stacking;

[0058] FIG12 is a schematic side view of a first coated electrode piece or a second coated electrode piece subjected to zebra coating in a second battery manufacturing method according to an embodiment of the present application; wherein the non-shaded area is an uncoated area;

[0059] FIG13 is a flow chart of the first part of the second battery manufacturing method according to an embodiment of the present application;

[0060] FIG14 is a flow chart of the second part of the second battery manufacturing method in an embodiment of the present application; wherein, S205 is the step after S204 in FIG13 , and the two steps are adjacent.

[0061] Explanation of the accompanying drawings: Battery 10; Current collecting assembly 100; First current collecting part 110; First wall 111; Second current collecting part 120; Second wall 121; First end 122; First inner cavity 130; Insulating part 140; Bare cell 200; First pole piece group 210; First pole piece 211; First straight piece 2111; Second pole piece group 220; Second pole piece 221; Second straight piece 2211; Second end 230; Shell assembly 300; Second inner cavity 310; Pole part 320; First pole piece 321; Second pole piece 322; Air guide channel 330; Sealing part 340; Shell opening 350; Limiting assembly 400; Third inner cavity 410; First through hole 420; Second through hole 430; First direction X; Second direction Y; Third direction Z.

[0062] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0064] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0065] In addition, when an element is described as being “fixed to” another element, it may be directly on the other element or one or more intervening elements may be present therebetween. When an element is described as being “connected to” another element, it may be directly connected to the other element or one or more intervening elements may be present therebetween.

[0066] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0067] Currently, the volume of the negative electrode changes significantly during battery discharge, making it difficult to effectively suppress the expansion of soft-pack batteries. This presents certain difficulties in battery manufacturing and application. In the prior art, by replacing the battery casing with a steel shell with a certain strength, the side frames of the steel shell can be used to suppress expansion, thereby improving the performance and stability of the battery to a certain extent. Generally, a laminated battery with a smaller width is placed upright in a steel shell to form a battery. Therefore, the direction of battery expansion changes from the thickness direction to the width direction, reducing the expansion force so that the side frames of the steel shell can be used to suppress battery expansion. However, due to the small width of the laminated battery electrode, it is quite difficult to manufacture, resulting in high production costs for the battery and reduced economic benefits of the battery.

[0068] To solve the above problem, the first aspect of the present application provides a battery 10. Referring to Figures 1 to 7, the battery 10 includes a current collecting assembly 100 and a bare cell 200. In some embodiments, the battery 10 is a lithium battery 10.

[0069] The current collecting assembly 100 includes a first collecting part 110 and a second collecting part 120. The outer contour of the first collecting part 110 can be in various structures. In some embodiments, the first collecting part 110 can be a rectangular parallelepiped. In other embodiments, the first collecting part 110 can be a polygonal body, etc., depending on the actual situation. The embodiment of the present application takes the rectangular first collecting part 110 as an example. The outer contour of the second collecting part 120 can also be in various structures. In some embodiments, the second collecting part 120 can be a rectangular parallelepiped. In other embodiments, the second collecting part 120 can be a polygonal body, etc., depending on the actual situation. The embodiment of the present application takes the rectangular second collecting part 120 as an example. The current collecting assembly 100 defines a first inner cavity 130. The first collecting part 110 has a first wall 111, and the second collecting part 120 has a second wall 121. Along the first direction X, the first wall 111 and the second wall 121 are arranged relative to each other. In some embodiments, the first wall surface 111 is perpendicular to the first direction X. In some embodiments, the second wall surface 121 is perpendicular to the first direction X.

[0070] The bare cell 200 includes a first electrode group 210 and a second electrode group 220. The bare cell 200 is arranged in the first inner cavity 130, that is, the bare cell 200 is arranged between the first current collecting part 110 and the second current collecting part 120. The first electrode group 210 includes a plurality of first electrode pieces 211 with the same polarity. For example, the first electrode pieces 211 can be set to two, three, four, etc. The first electrode pieces 211 are arranged one by one along the second direction Y perpendicular to the first direction X. It should be noted that the first electrode pieces 211 can be arranged at uniform intervals or at non-uniform intervals. Each first electrode piece 211 is connected to the first wall 111, that is, each first electrode piece 211 is electrically connected to the first current collecting part 110. The second electrode group 220 includes a plurality of second electrode pieces 221 with the same polarity. For example, the second electrode pieces 221 can be set to two, three, four, etc. The polarity of each second electrode piece 221 differs from that of each first electrode piece 211. That is, when each first electrode piece 211 is positive, each second electrode piece 221 is negative, and when each first electrode piece 211 is negative, each second electrode piece 221 is positive. Each second electrode piece 221 is arranged in a staggered and stacked manner with each first electrode piece 211, that is, each second electrode piece 221 is arranged in a spaced-apart arrangement along the second direction Y, and each second electrode piece 221 is staggered with each first electrode piece 211. It should be noted that the second electrode pieces 221 can be arranged at uniform or uneven spacing. Each second electrode piece 221 is connected to the second wall surface 121, that is, each second electrode piece 221 is electrically connected to the second current collecting portion 120.

[0071] Referring to Figure 2, the first pole piece 211 includes two first straight parts 2111, and the first straight parts 2111 extend in any direction perpendicular to the second direction Y. The outer contour of the first straight part 2111 can be a variety of structures. In some embodiments, the first straight part 2111 can be a rectangular parallelepiped. In other embodiments, the first straight part 2111 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular first straight part 2111 as an example. The ends of the first straight parts 2111 close to the second wall 121 are connected to each other. In some embodiments, along the second direction Y, the ends of the first straight parts close to the second wall 121 are connected in pairs. The ends of the first straight parts close to the first wall 111 are respectively connected to the first wall 111. Furthermore, the ends of the first straight parts close to the first wall 111 are respectively abutted against the first wall 111. The second pole piece 221 includes two second straight parts 2211, and the second straight parts 2211 extend in any direction perpendicular to the second direction Y. The outer contour of the second straight part 2211 can be a variety of structures. In some embodiments, the second straight part 2211 can be a rectangular parallelepiped. In other embodiments, the second straight part 2211 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular second straight part 2211 as an example. In some embodiments, the outer contours of the second straight part 2211 and the first straight part 2111 are the same. The ends of the second straight parts 2211 close to the first wall 111 are connected to each other. In some embodiments, along the second direction Y, the ends of the second straight parts close to the first wall 111 are connected in pairs. The ends of the second straight parts 2211 close to the second wall 121 are respectively connected to the second wall 121. Furthermore, the ends of the second straight parts close to the second wall 121 are respectively abutted against the second wall 121. In some embodiments, the first wall 111 and the second wall 121 are planar walls to ensure that each first straight portion is stably connected to the first wall 111, and each second straight portion is stably connected to the second wall 121. The first current collecting portion 110 compresses the first pole piece 211 along the first direction X, and the second current collecting portion 120 compresses the second pole piece 221 in the opposite direction of the first direction X, so that the limiting assembly limits the width of the bare cell 200, ensuring that the bare cell 200 is adapted to the housing assembly 300. There is no need to control the width of the pole piece, ensuring that the energy density of the battery 10 remains unchanged, reducing the manufacturing complexity of the bare cell 200, and reducing the production cost of the battery 10, thereby improving the economic benefits of the battery 10. The first current collecting part 110 and the second current collecting part 120 are configured to be conductive, so that when the battery 10 is working, the first current collecting part 110 can electrically connect the first pole pieces 211, and the second current collecting part 120 can electrically connect the second pole pieces 221, further improving the discharge efficiency of the battery 10 and ensuring the operating rate of the battery 10.

[0072] The battery 10 includes a shell assembly 300. Referring to Figures 1 and 5 to 9, the outer contour of the shell assembly 300 can be in various structures. In some embodiments, the shell assembly 300 can be a rectangular parallelepiped. In other embodiments, the shell assembly 300 can be a polygon, etc., depending on the actual situation. The embodiment of the present application takes the rectangular shell assembly 300 as an example. The shell assembly 300 is used to provide support to the battery 10 to limit the expansion of the battery 10, so the shell assembly 300 has high rigidity. In some embodiments, the material of the shell assembly 300 includes metal. In other embodiments, the material of the shell assembly 300 includes alloy. Furthermore, the material of the shell assembly 300 includes stainless steel to provide higher rigidity and stronger sealing. The shell assembly 300 defines a second inner cavity 310, and the current collecting assembly 100 and the bare battery cell 200 are arranged in the second inner cavity 310. In some embodiments, the second inner cavity 310 has a high degree of sealing, so that in the working state, the bare cell 200 is separated from the outside world to protect the normal operation of the bare cell 200 of the battery 10. It should be noted that in the working state, if the bare cell 200 expands, and due to the nature of the laminated cell, the bare cell 200 expands in the stacking direction, that is, the bare cell 200 expands along the second direction Y until it abuts the shell assembly 300. The shell assembly 300 provides support for the bare cell 200 to suppress the deformation failure of the bare cell 200 caused by the expansion of the bare cell 200, so as to ensure the normal operation of the battery 10. In some embodiments, the shell assembly 300 includes a shell side plate, a shell bottom plate, and a shell upper plate. The shell side plate is configured to abut the bare cell 200 when the bare cell 200 expands. Furthermore, the shell side plate is integrally formed to make the shell side plate stronger. The shell side plate can provide a higher support force to the bare cell 200 to further ensure the normal operation of the battery 10. In some embodiments, referring to FIG7 , the housing assembly 300 includes a housing opening 350 , which is located on a side of the current collecting assembly 100 facing away from the bare cell 200 along the first direction X. Furthermore, the housing assembly 300 includes a housing end cap, which is configured to be located on the housing opening 350 and seal the second inner cavity 310 by welding to ensure normal operation of the battery 10.

[0073] In some embodiments, the housing assembly 300 includes a pole portion 320, which is used to connect to the current collector assembly 100. In some embodiments, the pole portion 320 is provided on the housing upper plate. It should be noted that in order to ensure that the end of the housing assembly 300 abutting the bare cell 200 has high strength, the pole portion 320 is provided on the side of the current collector assembly 100 away from the bare cell 200 along the first direction X to ensure high strength of the housing assembly 300.

[0074] In some embodiments, the pole portion 320 includes a first pole 321, and the first pole 321 is connected to the first current collecting portion 110, or the second pole 322 is connected to the first current collecting portion 110. In other embodiments, the pole portion 320 includes a first pole 321 and a second pole 322, and along the second direction Y, the first pole 321 and the second pole 322 are arranged spaced apart from each other, the first pole 321 is connected to the first current collecting portion 110, and the second pole 322 is connected to the second current collecting portion 120.

[0075] In some embodiments, referring to FIG4 , along the first direction X, the pole portion 320 is arranged on the side of the first current collecting portion 110 away from the second current collecting portion 120, and the second current collecting portion 120 includes a first end portion 122, and the first end portion 122 abuts against the second pole 322. The current collecting assembly 100 includes an insulating portion 140, and the insulating portion 140 is arranged between the first end portion 122 and the first current collecting portion 110. The insulating portion 140 is used to prevent the first current collecting portion 110 and the second current collecting portion 120 from being connected, thereby protecting the normal operation of the battery 10.

[0076] In some embodiments, referring to FIG3 , along the second direction Y, the second current collecting part 120 is at least partially located on one side of the bare cell 200 , and along the second direction Y, the bare cell 200 includes a second end 230 , and the insulating part 140 is partially provided between the second current collecting part 120 and the second end 230 , and the insulating part 140 is used to prevent connection between the second current collecting part 120 and the second end 230 , thereby protecting the normal operation of the battery 10 .

[0077] The shell assembly 300 is provided with an air guide channel 330, and the outer contour of the air guide channel 330 can be in a variety of structures. In some embodiments, the air guide channel 330 can be a rectangular parallelepiped. In other embodiments, the air guide channel 330 can be a polygon, etc. In other embodiments, the air guide channel 330 can be a cylinder, etc. It depends on the actual situation. The embodiment of the present application takes the cylindrical air guide channel 330 as an example. The air guide channel 330 is connected to the second inner cavity 310. The air guide channel 330 is used to discharge the high-temperature and high-pressure gas generated by the heat of the bare battery cell 200 when the bare battery cell 200 is damaged by expansion, so as to prevent the battery 10 from exploding and causing damage to the battery 10. Since the bare battery cell 200 is in the second inner cavity 310, the air guide channel 330 is located on one side of the bare battery cell 200 along the second direction Y. It should be noted that in the working state, if the bare cell 200 expands to the point of damage, and due to the nature of the laminated cell, the bare cell 200 generates more high-temperature and high-pressure gas along the stack, that is, the bare cell 200 expands along the second direction Y to generate more high-temperature and high-pressure gas. By arranging the air guide channel 330 along the second direction Y on one side of the bare cell 200, the high-temperature and high-pressure gas generated by the heat of the bare cell 200 can be quickly discharged to protect the normal operation of the battery 10.

[0078] The shell assembly 300 includes a blocking portion 340. Referring to Figures 1, 6 and 7, the outer contour of the blocking portion 340 can be in a variety of structures. In some embodiments, the blocking portion 340 can be a rectangular parallelepiped. In other embodiments, the blocking portion 340 can be a polygon, etc. In other embodiments, the blocking portion 340 can be a cylinder, etc. It depends on the actual situation. The embodiment of the present application takes the cylindrical blocking portion 340 as an example. The blocking portion 340 is arranged in the air guide channel 330 to block the air guide channel 330. The blocking portion 340 is configured to be pushed away from the air guide channel 330 after obtaining the pressure provided by the bare cell 200 along the second direction Y. When the bare cell 200 does not generate high-temperature and high-pressure gas, the second inner cavity 310 is separated from the outside world to ensure the normal operation of the battery 10, and when the bare cell 200 generates high-temperature and high-pressure gas, the second inner cavity 310 is connected to the outside world.

[0079] The following defines the meaning of "the first pole piece 211 is the anode pole piece, and the air guide channel 330 is located on a side of the first current collecting section 110 along the first direction X": When the first pole piece 211 is the anode pole piece, the plane perpendicular to the first direction X is the first plane, and the two opposite outermost endpoints of the housing assembly 300 along the first direction X are equidistant from the first plane. Along the first direction X, the air guide channel 330 is located on the side of the first plane facing the first current collecting section 110.

[0080] The following definition defines "the second electrode piece 221 is the anode electrode piece, and the air guide channel 330 is located on a side of the second current collecting section 120 along the first direction X": a plane perpendicular to the first direction X is defined as the first plane, and the two opposite outermost endpoints of the housing assembly 300 along the first direction X are equidistant from the first plane. Along the first direction X, the air guide channel 330 is located on the side of the first plane facing the second current collecting section 120.

[0081] It should be noted that, referring to Figures 1, 6 and 7, in the working state, if the bare cell 200 expands to the point of damage, and because of the nature of the laminated cell, the bare cell 200 generates more high-temperature and high-pressure gas along the stack, and the volume of the gas generated at the anode collector is greater than the volume of the gas generated at the cathode collector, that is, the bare cell 200 generates more high-temperature and high-pressure gas along the collector with the anode polarity. By placing the gas guide channel 330 along the first direction X, close to the side of the collector with the anode polarity, the high-temperature and high-pressure gas generated by the heat of the bare cell 200 can be quickly discharged to protect the normal operation of the battery 10.

[0082] The following defines the meaning of "the first pole piece 211 is an anode pole piece, and the air guide channel 330 is located on a side of the first current collecting section 110 along the third direction Z": When the first pole piece 211 is an anode pole piece, the plane perpendicular to the third direction Z is the second plane, and the distances from the two opposite outermost endpoints of the housing assembly 300 along the third direction Z to the second plane are equal. Along the third direction Z, the air guide channel 330 is located on the side of the second plane facing the first current collecting section 110.

[0083] The following definition of "the second electrode piece 221 is the anode electrode piece, and the gas guide channel 330 is located on a side of the second current collecting section 120 along the third direction Z" means: the plane perpendicular to the third direction Z is the second plane, and the two opposite outermost endpoints of the housing assembly 300 along the third direction Z are equidistant from the second plane. Along the third direction Z, the gas guide channel 330 is located on the side of the second plane facing the second current collecting section 120.

[0084] It should be noted that, referring to Figures 1, 6 and 7, when the bare cell 200 expands to the point of damage and generates gas, the volume of the gas generated at the anode collector is greater than the volume of the gas generated at the cathode collector, that is, the bare cell 200 generates more high-temperature and high-pressure gas along the collector with the anode polarity. By placing the gas guide channel 330 along the third direction Z, close to the side of the collector with the anode polarity, the high-temperature and high-pressure gas generated by the heat of the bare cell 200 can be quickly discharged to protect the normal operation of the battery 10.

[0085] In some embodiments, along the first direction X and the third direction Z, the gas guide channel 330 is adjacent to the side of the current collecting portion with the anode polarity, so as to further quickly discharge the high-temperature and high-pressure gas generated by the bare battery cell 200 due to heating, thereby further protecting the normal operation of the battery 10.

[0086] In some embodiments, the projection plane is a plane perpendicular to the second direction Y, the gas guide channel 330 forms a first orthographic projection on the projection plane, the first current collecting portion 110 forms a second orthographic projection on the projection plane, and the first orthographic projection coincides with the second orthographic projection. Alternatively, the projection plane is a plane perpendicular to the second direction Y, the gas guide channel 330 forms a first orthographic projection on the projection plane, the second current collecting portion 120 forms a third orthographic projection on the projection plane, and the first orthographic projection coincides with the third orthographic projection. By aligning the first orthographic projection formed by the gas guide channel 330 with the orthographic projection formed by the anode current collecting portion, that is, by arranging the gas guide channel 330 on one side of the anode current collecting portion along the second direction Y, when the bare cell 200 expands to the point of damage and generates gas, the rate of discharging the gas from the anode collecting portion is further increased, thereby further protecting the normal operation of the battery 10.

[0087] The second inner cavity 310 forms a fourth orthographic projection on the projection plane. The area of ​​the fourth orthographic projection is S, the silicon content of the battery 10 is A, the tensile strength of the shell assembly 300 is M, the number of layers of the anode electrode is C, and the area S, the silicon content A, and the tensile strength M satisfy: M≥4A*100*C / S. Exemplarily, the tensile strength M can be 4A*100*C / S, 5A*100*C / S, 6A*100*C / S, 7A*100*C / S, and so on. It should be noted that the tensile strength M of the shell assembly 300 should be moderate. Since the bare battery cell 200 expands, the shell assembly 300 needs to provide support. When the tensile strength M of the shell assembly 300 is low, the shell assembly 300 is easily damaged. When the tensile strength M of the shell assembly 300 is high, although the shell assembly 300 meets the requirements of protecting the bare battery cell 200, the processing and manufacturing cost of the shell assembly 300 is high, resulting in a high production cost of the battery 10, reducing the economic benefits of the battery 10.

[0088] In some embodiments, the area S, silicon content A, number of anode layers C, and tensile strength M satisfy the following relationship: M>4.4492A*100*C / S. For example, the tensile strength M may be 5A*100*C / S, 6A*100*C / S, 7A*100*C / S, and so on.

[0089] In order to verify some of the above embodiments, the specific experimental data of this application are shown in Table 1.

[0090] Table 1

[0091] Where S refers to the area of ​​the housing assembly 300, the silicon content A refers to the silicon content of the battery 10, 4A*100*C / S and 4.4492A*100*C / S refer to the pressures calculated by the corresponding formulas, and the 4C cycle 300 cycle expansion rate refers to the expansion ratio of the battery 10 after 300 cycles at a discharge rate of 4C. It should be noted that the number of anode sheet layers C is not shown in Table 1, and the number of anode sheet layers C in any embodiment or comparative example in Table 1 is the same.

[0092] Obviously, referring to Examples 1 to 5, in Example 1, the tensile strength M is 85, and the expansion rate after 300 cycles at 4C is 25%; in Example 2, the tensile strength M is 100, and the expansion rate after 300 cycles at 4C is 20%; in Example 3, the tensile strength M is 105, and the expansion rate after 300 cycles at 4C is 18%; in Example 4, the tensile strength M is 205, and the expansion rate after 300 cycles at 4C is 10%; and in Example 5, the tensile strength M is 520, and the expansion rate after 300 cycles at 4C is 7%. With other conditions remaining unchanged, as the tensile strength M increases, the expansion rate of the bare cell 200 decreases, thereby increasing the service life of the battery 10.

[0093] Obviously, referring to Example 3 and Comparative Example 1, in Example 3, the silicon content A is 30%, the calculated value of 4A*100*C / S is 104.6, and the expansion rate after 300 cycles of 4C is 18%; in Comparative Example 1, the silicon content A is 40%, the calculated value of 4A*100*C / S is 125.4, and the expansion rate after 300 cycles of 4C is 31%. When other conditions remain unchanged, as the silicon content A increases, the calculated value of 4A*100*C / S increases, thereby increasing the expansion rate of the bare battery cell 200.

[0094] Obviously, referring to Example 3 and Comparative Example 2, in Example 3, the area S is 382.8, the calculated value of 4A*100*C / S is 104.6, and the expansion rate after 300 cycles of 4C is 18%; in Comparative Example 2, the area S is 325.6, the calculated value of 4A*100*C / S is 123.0, and the expansion rate after 300 cycles of 4C is 21%. When other conditions remain unchanged, as the area S increases, the calculated value of 4A*100*C / S increases, thereby increasing the expansion rate of the bare cell 200.

[0095] Obviously, referring to Examples 1 and 2, in Example 1, the area S, silicon content A, and tensile strength M satisfy: M < 4A*100*C / S, at which point the expansion rate after 300 cycles of 4C is 25%; in Example 2, the area S, silicon content A, and tensile strength M satisfy: M > 4A*100*C / S, at which point the expansion rate after 300 cycles of 4C is 20%. Thus, when M > 4A*100*C / S, the housing assembly 300 can provide greater support to the bare cell 200, thereby reducing the expansion rate of the bare cell 200 after 300 cycles of 4C. This reduces the expansion rate of the bare cell 200 during operation and increases the service life of the battery 10.

[0096] Obviously, referring to Examples 2 and 3, in Example 2, the area S, silicon content A, and tensile strength M satisfy: M < 4.4492A*100*C / S, at which point the expansion rate after 300 cycles at 4C is 20%; in Example 2, the area S, silicon content A, and tensile strength M satisfy: M > 4.4492A*100*C / S, at which point the expansion rate after 300 cycles at 4C is 18%. Thus, when M > 4.4492A*100*C / S, the housing assembly 300 can provide greater support to the bare cell 200, thereby reducing the expansion rate of the bare cell 200 after 300 cycles at 4C. This reduces the expansion rate of the bare cell 200 during operation and increases the service life of the battery 10.

[0097] In some embodiments, the battery 10 includes a limiting assembly 400, as shown in Figures 8 and 9. The outer contour of the limiting assembly 400 can have various structures. In some embodiments, the limiting assembly 400 can be a rectangular parallelepiped. In other embodiments, the limiting assembly 400 can be a polygon, etc. In other embodiments, the limiting assembly 400 can be a cylinder. The specific configuration depends on the actual situation. In the embodiment of the present application, a rectangular limiting assembly 400 is used as an example. The limiting assembly 400 is disposed in the second inner cavity 310 and defines a third inner cavity 410. The limiting assembly 400 is provided with a first through hole 420, the axis of which is parallel to the third direction Z. The limiting assembly 400 is provided with a second through hole 430, which can be multiple in number. For example, the number of second through holes 430 can be one, two, three, four, five, etc. The axis of the second through hole 430 is parallel to the first direction X, and the first through hole 420 and the second through hole 430 communicate with the third inner cavity 410. In some embodiments, the first through hole 420 is configured to place the bare cell 200. In other embodiments, the second through hole 430 is configured to assist in injecting liquid into the bare cell 200. The bare cell 200 is disposed in the third inner cavity 410, and the limiting assembly 400 is used to abut the bare cell 200 when the bare cell 200 expands, so as to further provide support to the bare cell 200. In some embodiments, when the tensile strength is M and the silicon content A satisfies: M>4.4492A*100*C / S, A≥50%, the limiting assembly 400 is used to further provide support to the bare cell 200.

[0098] The second aspect of the present application further provides a method for manufacturing a battery 10 , referring to FIG. 10 to FIG. 14 . The method for manufacturing the battery 10 is applicable to any one of the batteries 10 in the above-mentioned embodiments.

[0099] S101: Stack the first coated electrode and the second coated electrode to perform S-shaped lamination and form a laminated portion, which includes two opposite bending areas. It should be noted that, referring to Figure 11, the first coated electrode and the second coated electrode refer to the coated electrodes. The S-shaped lamination is defined as stacking the first coated electrode and the second coated electrode to form a electrode group, and then starting from one end of the electrode group, moving the same distance to the other end opposite to the electrode group, and then bending the electrode group in the same direction to fit the electrode groups until the moving distance is insufficient, thus forming an S-shaped lamination. The bending area includes the portion of the electrode provided outside the laminated portion, and the polarity of the electrode in each opposite bending area is different.

[0100] S102: Cut off the two bending areas, the first coated electrode group forms a first cut-off area and a plurality of first electrode pieces 211, and the second coated electrode group forms a second cut-off area and a plurality of second electrode pieces 221. It should be noted that after cutting off the bending area of ​​the first coated electrode, the cut-off portion is the first cut-off area, and the uncut portion of the first coated electrode forms a plurality of first electrode pieces 211. After cutting off the bending area of ​​the second coated electrode, the cut-off portion is the second cut-off area, and the uncut portion of the second coated electrode forms a plurality of second electrode pieces 221. After cutting off the two bending areas, the first electrode pieces 211 are spaced one by one along the second direction Y, and the second electrode pieces 221 are spaced one by one along the second direction Y.

[0101] S103: Connect the first current collecting section 110 to each first electrode piece 211, and connect the second current collecting section 120 to each second electrode piece 221 to produce the battery 10. In some embodiments, the first current collecting section 110 is connected to each first electrode piece 211 by welding, and the second current collecting section 120 is connected to each second electrode piece 221 by welding. The first current collecting section 110 is located in the first cutout region, and the second current collecting section 120 is located in the second cutout region.

[0102] In some embodiments, after the step of connecting the first current collecting portion 110 and each first electrode piece 211 , and connecting the second current collecting portion 120 and each second electrode piece 221 to produce the battery 10 , the method for manufacturing the battery 10 further includes:

[0103] The insulating portion 140 is mounted on the first current collecting portion 110 and the second current collecting portion 120. In some embodiments, the insulating portion 140 is disposed between the first current collecting portion 110 and the second current collecting portion 120 to ensure insulation between the first current collecting portion 110 and the second current collecting portion 120. In other embodiments, the insulating portion 140 is disposed between the current collecting assembly 100 and the bare cells 200 to ensure partial insulation between the current collecting assembly 100 and the bare cells 200.

[0104] In some embodiments, after the step of installing the insulating portion 140 on the first current collecting portion 110 and the second current collecting portion 120 , the method for manufacturing the battery 10 further includes:

[0105] The current collecting assembly 100 and the bare cell 200 are placed in the shell assembly 300, and the pole portion 320 is installed on the side of the shell assembly 300 away from the bare cell 200 along the second direction Y. It should be noted that the current collecting assembly 100 and the bare cell 200 are placed in the shell assembly 300, that is, the current collecting assembly 100 and the bare cell 200 are placed in the second inner cavity 310. In order to ensure that the shell assembly 300 has a high strength at one end thereof abutting against the bare cell 200, the pole portion 320 is provided on the side of the current collecting assembly 100 away from the bare cell 200 along the first direction X to ensure that the shell assembly 300 has a high strength.

[0106] In some embodiments, after placing the current collecting assembly 100 and the bare cell 200 into the housing assembly 300 and installing the pole portion 320 on the side of the housing assembly 300 away from the bare cell 200 along the second direction Y, the battery 10 manufacturing method further includes:

[0107] The housing assembly 300 is welded to isolate the second inner cavity 310 defined by the housing assembly 300 from the outside world. It should be noted that welding the housing assembly 300 provides a high degree of airtightness to the second inner cavity 310, thereby isolating the bare cells 200 from the outside world during operation, thereby protecting the bare cells 200 of the battery 10 from normal operation.

[0108] In some embodiments, before the step of laminating the first coated electrode sheet and the second coated electrode sheet to form an S-shaped lamination and a laminated portion, wherein the laminated portion includes two opposing bends, the battery 10 manufacturing method further includes: after laminating the anode electrode sheet and the separator, cleaning to form the first coated electrode sheet;

[0109] or,

[0110] After the anode electrode and the separator are combined, they are cleaned to form a second coated electrode. Referring to Figure 12 , laser cleaning and shaping are performed, utilizing the uncoated areas of the first electrode 211 and the second electrode 221 in the zebra electrode. When folding, the coated areas are positioned at the bends. After the uncoated areas are removed, they can be directly connected to the first current collector 110 and the second current collector 120, reducing processing costs and improving the economic benefits of the process.

[0111] In some embodiments, before the step of laminating the first coated electrode sheet and the second coated electrode sheet to form an S-shaped lamination and a laminated portion, wherein the laminated portion includes two opposing bends, the method for manufacturing the battery 10 further includes: coating the anode electrode sheet by zebra coating, and then combining the anode electrode sheet and the separator to form a first coated electrode sheet;

[0112] or,

[0113] After coating the anode electrode piece by zebra coating, the anode electrode piece and the separator are composited to form a second coated electrode piece. It should be noted that by composited electrode pieces with anode polarity and separators to form coated electrode pieces, the steps required for stacking the battery 10 are reduced during operation, thereby improving the production efficiency of the battery 10. The anode electrode piece and the separator are cleaned to produce coated areas and uncoated areas on the first coated electrode piece or the second coated electrode piece. In some embodiments, the method of composite electrode pieces and separators includes composited the separator and the electrode piece by electrospinning.

[0114] It should be noted that, in some embodiments, the battery manufacturing method includes obtaining an anode electrode with a gap by zebra coating, using a zebra electrode, and then compounding the zebra electrode and a diaphragm to form a first coated electrode or a second coated electrode.

[0115] It should be noted that, in some embodiments, the cathode electrode can be zebra coated first to form a first coated electrode or a second coated electrode; or coated first and then cleaned to form a first coated electrode or a second coated electrode.

[0116] For ease of understanding, the following describes a method for manufacturing a battery 10 corresponding to a more complete embodiment of the present invention, wherein the deviation value is greater than or equal to a preset value. Referring to FIG. 13 and FIG. 14 , there are flow charts of a method for manufacturing a battery 10 according to another embodiment of the present invention, which includes but is not limited to the following steps:

[0117] S201: Cleaning the composite anode electrode piece and the diaphragm to form a first coated electrode piece; or cleaning the composite anode electrode piece and the diaphragm to form a second coated electrode piece.

[0118] S202: stacking the first coated electrode piece and the second coated electrode piece to perform S-shaped stacking and produce a stacked portion, wherein the stacked portion includes two opposite bending regions.

[0119] S203 : cutting off the two bending areas, the first coated electrode group forms a first cut-off area and a plurality of first electrode pieces 211 , and the second coated electrode group forms a second cut-off area and a plurality of second electrode pieces 221 .

[0120] S204 connects the first current collecting portion 110 and each first electrode piece 211 , and connects the second current collecting portion 120 and each second electrode piece 221 to produce the battery 10 .

[0121] S205 : Installing the insulating portion 140 on the first current collecting portion 110 and the second current collecting portion 120 .

[0122] S206 : placing the current collecting assembly 100 and the bare cell 200 into the housing assembly 300 , and installing the pole portion 320 on a side of the housing assembly 300 away from the bare cell 200 along the second direction Y.

[0123] S207: Welding the shell assembly 300 to isolate the second inner cavity 310 defined by the shell assembly 300 from the outside.

[0124] It should be noted that the battery 10, bare cell 200 and other coating contents disclosed in this application can be found in the prior art and will not be described in detail here.

[0125] In addition, it should be noted that the preferred embodiments of the present application are given in the specification and drawings of this application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of this application. The purpose of providing these embodiments is to make the understanding of the disclosure of this application more thorough and comprehensive. In addition, the above-mentioned technical features are further combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of this application; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A battery, characterized in that, include: A current collecting assembly, the current collecting assembly comprising a first current collecting portion and a second current collecting portion, the current collecting assembly defining a first inner cavity, the first current collecting portion having a first wall surface, the second current collecting portion having a second wall surface, and the first wall surface and the second wall surface are arranged opposite to each other along a first direction; A bare cell, the bare cell comprising a first electrode group and a second electrode group, the bare cell being arranged in the first inner cavity, the first electrode group comprising a plurality of first electrode plates with the same polarity, the first electrode plates being arranged one by one in a second direction perpendicular to the first direction, the first electrode plates being connected to the first wall, the second electrode group comprising a plurality of second electrode plates with the same polarity, the second electrode plates being different in polarity from the first electrode plates, the second electrode plates being arranged one by one in an alternating and stacked manner with the first electrode plates, and the second electrode plates being connected to the second wall; Among them, the first pole piece includes two first straight parts, and one end of each of the first straight parts close to the second wall is connected to each other, and one end of each of the first straight parts close to the first wall is respectively connected to the first wall; the second pole piece includes two second straight parts, and one end of each of the second straight parts close to the first wall is connected to each other, and one end of each of the second straight parts close to the second wall is respectively connected to the second wall.

2. The battery according to claim 1, characterized in that, The battery comprises a shell assembly, the shell assembly defines a second inner cavity, and the current collecting assembly and the bare cell are arranged in the second inner cavity.

3. The battery according to claim 2, characterized in that, The shell assembly includes a pole portion, and along the first direction, the pole portion is arranged on a side of the current collecting assembly away from the bare battery cell.

4. The battery according to claim 3, characterized in that, The pole portion includes a first pole and a second pole. The first pole and the second pole are arranged at intervals along the second direction. The first pole is connected to the first current collecting portion, and the second pole is connected to the second current collecting portion.

5. The battery according to claim 4, characterized in that, Along the first direction, the pole portion is arranged on a side of the first current collecting portion away from the second current collecting portion, the second current collecting portion includes a first end portion, the first end portion abuts against the second pole, and the current collecting assembly includes an insulating portion, and the insulating portion is arranged between the first end portion and the first current collecting portion.

6. The battery according to claim 2, characterized in that, Along the second direction, the second current collecting portion is at least partially located on one side of the bare cell. Along the second direction, the bare cell includes a second end portion, and the insulating portion is partially disposed between the second current collecting portion and the second end portion.

7. The battery according to claim 6, characterized in that, The shell assembly is provided with an air guiding channel, the air guiding channel is connected to the second inner cavity, and along the second direction, the air guiding channel is located on one side of the bare battery core.

8. The battery according to claim 7, characterized in that, The shell assembly includes a blocking portion, which is disposed in the air guiding channel to block the air guiding channel, and the blocking portion is configured to be pushed away from the air guiding channel after receiving pressure provided by the bare battery cell along the second direction.

9. The battery according to claim 7, characterized in that, The first pole piece is an anode pole piece, and along the first direction, the gas guide channel is adjacent to one side of the first current collecting portion; or, The second pole piece is an anode pole piece, and along the first direction, the air guide channel is adjacent to one side of the second current collecting portion.

10. The battery according to claim 9, characterized in that, The third direction is set to be perpendicular to the first direction and the second direction. The first pole piece is an anode pole piece. Along the third direction, on the side of the air guide channel adjacent to the first current collector part; Or, The third direction is set to be perpendicular to the first direction and the second direction. The second pole piece is an anode pole piece. Along the third direction, on the side of the air guide channel adjacent to the second current collector part.

11. The battery according to claim 10, characterized in that, The projection plane is a plane perpendicular to the second direction. The air guide channel forms a first orthographic projection on the projection plane, and the first current collector part forms a second orthographic projection on the projection plane. The first orthographic projection coincides with the second orthographic projection; Or, The projection plane is a plane perpendicular to the second direction. The air guide channel forms a first orthographic projection on the projection plane, and the second current collector part forms a third orthographic projection on the projection plane. The first orthographic projection coincides with the third orthographic projection.

12. The battery according to claim 11, characterized in that, The second inner cavity forms a fourth orthographic projection on the projection plane. The area of the fourth orthographic projection is S, the silicon content of the battery is A, the tensile strength of the housing assembly is M, and the number of layers of the anode pole piece is C. The area S, the silicon content A, the number of layers C of the anode sheet, and the tensile strength M satisfy: M≥4A*100*C / S.

13. The battery according to claim 12, characterized in that, The area S, the silicon content A, the number of layers C of the anode sheet, and the tensile strength M satisfy: M>4.4492A*100*C / S.

14. The battery according to claim 2, wherein, The battery includes a limiting component. The limiting component is arranged in the second inner cavity. The limiting component defines a third inner cavity. The limiting component is provided with a first through hole. The axis of the first through hole is parallel to the third direction. The limiting component is provided with a second through hole. The axis of the second through hole is parallel to the first direction. The first through hole and the second through hole communicate the third inner cavity. The bare battery cell is arranged in the third inner cavity.

15. A method for manufacturing a battery, characterized in that, The battery manufacturing method is applicable to the battery according to any one of claims 1 to 14. The battery manufacturing method includes: Stacking the first coated pole piece and the second coated pole piece to perform S-shaped stacking to form a stacked part. The stacked part includes two opposite bending areas; Cut off the two bending areas. The first coated pole piece group forms a first cut-off area and a plurality of the first pole pieces. The second coated pole piece group forms a second cut-off area and a plurality of the second pole pieces; Connect the first current collector part to each of the first pole pieces, and connect the second current collector part to each of the second pole pieces to produce the battery.

16. The method for manufacturing a battery according to claim 15, wherein, After the step of connecting the first current collector part to each of the first pole pieces and connecting the second current collector part to each of the second pole pieces to produce the battery, the battery manufacturing method further includes: installing the insulating part on the first current collector part and the second current collector part.

17. The method for manufacturing a battery according to claim 16, wherein, The battery includes a housing assembly. The housing assembly defines a second inner cavity After the step of installing the insulating part on the first current collecting part and the second current collecting part, the battery manufacturing method further includes: placing the current collecting assembly and the bare cell into the shell assembly, and installing the pole part on the side of the shell assembly away from the bare cell along the second direction.

18. The method for manufacturing a battery according to claim 17, wherein, After the steps of placing the current collecting assembly and the bare cell into the shell assembly and installing the pole portion on the side of the shell assembly away from the bare cell along the second direction, the battery manufacturing method further includes: welding the shell assembly so that the second inner cavity defined by the shell assembly is separated from the outside.

19. The method for manufacturing a battery according to claim 15, wherein, Before the step of laminating the first coated electrode sheet and the second coated electrode sheet to form an S-shaped lamination and a laminated portion, wherein the laminated portion includes two opposite bending regions, the battery manufacturing method further includes: after the anode electrode sheet and the diaphragm are composited, cleaning is performed to form the first coated electrode sheet; or, After the anode electrode plate and the diaphragm are combined, cleaning is performed to form the second coated electrode plate.

20. The method for manufacturing a battery according to claim 15, wherein, Before the step of laminating the first coated electrode sheet and the second coated electrode sheet to form an S-shaped lamination and a laminated portion, wherein the laminated portion includes two opposite bending regions, the battery manufacturing method further includes: coating the anode electrode sheet by zebra coating, and then compounding the anode electrode sheet and the diaphragm to form the first coated electrode sheet; or, After coating the anode electrode plate by zebra coating, the anode electrode plate and the diaphragm are composited to form the second coated electrode plate.

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