Battery cell forming device and method

Abstract

The invention provides a battery cell forming device and method, the battery cell forming device comprises a battery cell extrusion mechanism, the battery cell extrusion mechanism comprises a first extrusion part (10) which comprises a plurality of first extrusion sections (11) capable of independently moving and is configured to enable the plurality of first extrusion sections (11) to move close to or away from a battery cell in a synchronous or asynchronous manner; the second extrusion part (20) is positioned on the opposite side of the first extrusion part (10) along a first direction (z), comprises a plurality of second extrusion sections (21) capable of independently moving respectively, and is configured to enable the plurality of second extrusion sections (21) to move close to or away from the battery cell in a synchronous or asynchronous manner, and the first direction (z) is parallel to the extrusion direction of the battery cell extrusion mechanism; the plurality of first extrusion sections (11) can be divided into at least two groups of first extrusion sections (11) which move relatively and independently, and / or the plurality of second extrusion sections (21) can be divided into at least two groups of second extrusion sections (21) which move relatively and independently.

Description

Technical Field

[0001] The present disclosure relates to the field of battery processing, and in particular to a battery core forming device and method. Background Art

[0002] In the new energy industry, battery technology is an important factor in its development. Rechargeable batteries can be used continuously by activating active materials through charging after discharge, and have a wide range of application prospects. For battery cells, the product quality is the focus of manufacturers. Summary of the invention

[0003] In one aspect of the present disclosure, a battery cell forming device is provided, comprising a battery cell pressing mechanism for applying a pressing operation to a battery cell, the battery cell pressing mechanism comprising: A first extrusion portion, comprising a plurality of first extrusion segments that can move independently, and configured to make the plurality of first extrusion segments move toward or away from the battery cell in a synchronous or asynchronous manner; and The second extrusion portion is located at the opposite side of the first extrusion portion along the first direction, and includes a plurality of second extrusion segments that can move independently, and is configured to make the plurality of second extrusion segments move closer to or farther from the battery cell in a synchronous or asynchronous manner, Wherein, the first direction is parallel to the extrusion direction of the battery cell extrusion mechanism; The plurality of first extrusion segments can be divided into at least two groups of first extrusion segments that move relatively independently, and / or the plurality of second extrusion segments can be divided into at least two groups of second extrusion segments that move relatively independently.

[0004] In the present embodiment, the first extrusion part in the battery cell extrusion mechanism includes a plurality of first extrusion segments capable of independent movement, and the second extrusion part located on the opposite side thereof along the first direction includes a plurality of second extrusion segments capable of independent movement, and these first extrusion segments and the second extrusion segments can both move closer to or farther away from the battery cell in a synchronous or asynchronous manner, so that these first extrusion segments and the second extrusion segments can perform the same or different movements on different parts of the battery cell at the same time or at different times as needed, so as to conveniently perform appropriate operations on the battery cell as needed during the battery cell forming process, such as extruding, holding, and positioning different parts of the battery cell, thereby improving the flexibility and adaptability of the process, which is conducive to improving the quality of the battery cell; and, the first extrusion segments and the second extrusion segments can both be divided into at least two groups, and the groups can move relatively independently, thereby meeting the process requirements of more flexible and rich battery cell forming.

[0005] In some embodiments, the plurality of first extrusion segments are arranged at intervals along at least one direction perpendicular to the first direction; and / or the plurality of second extrusion segments are arranged at intervals along at least one direction perpendicular to the first direction.

[0006] In this embodiment, a plurality of first extrusion segments are arranged at intervals in at least one direction perpendicular to the first direction, and / or a plurality of second extrusion segments are arranged at intervals in at least one direction perpendicular to the first direction, so that the plurality of first extrusion segments and / or the plurality of second extrusion segments can apply extrusion force to different parts of the battery cell in the arrangement direction, thereby meeting the flexible process requirements during battery cell molding.

[0007] In some embodiments, the number of the plurality of first extrusion segments is the same as the number of the plurality of second extrusion segments, the plurality of first extrusion segments correspond to the plurality of second extrusion segments one by one and are opposite to each other along the first direction.

[0008] In this embodiment, by making the number of the first extrusion segments and the second extrusion segments the same, they are both one-to-one corresponding and opposite to each other along the first direction. This makes it convenient to group the first extrusion segments and the second extrusion segments according to different parts of the battery cell, and enables the corresponding parts of the battery cell to obtain basically the same extrusion effect.

[0009] In some embodiments, the plurality of second extrusion segments are located below the plurality of first extrusion segments, and the second extrusion portion further includes a conveyor belt assembly, the conveyor belt assembly including a transmission wheel group and a conveyor belt, the conveyor belt is wound around the transmission wheel group and the upper surface of the plurality of second extrusion segments to support the battery cell.

[0010] In this embodiment, the conveyor belt assembly can convey the battery cells, and the conveyor belt passing through the transmission wheel assembly and the second extrusion section can support the battery cells to reduce the possibility of indentations on the surface of the battery cells caused by the gaps between the second extrusion sections.

[0011] In some embodiments, the conveyor belt assembly also includes a belt tensioning mechanism, which includes a buffer roller and a bracket, wherein the buffer roller is movably disposed on the bracket, and the conveyor belt also passes around the buffer roller so that when at least part of the multiple second extrusion segments moves, the tension of the conveyor belt can be adjusted by moving the buffer roller relative to the bracket.

[0012] The buffer roller can move on the bracket. By adjusting the position of the buffer roller, the tension of the conveyor belt can be adjusted in coordination with the movement of the second extrusion section. The second extrusion sections on the left and right sides remain stationary. When the second extrusion section in the middle moves upward, the conveyor belt can be driven upward, and the buffer roller moves to the right accordingly, releasing a certain length of the conveyor belt to prevent the conveyor belt from deviating relative to the second extrusion section or being damaged by excessive tension on the conveyor belt.

[0013] In some embodiments, the battery cell includes a wound battery cell, and the battery cell forming device further includes a battery cell expansion mechanism, wherein the battery cell expansion mechanism is configured to expand the wound battery cell along a reference plane perpendicular to the first direction, so that the wound battery cell is deformed in a direction parallel to the reference plane; The first part of the first extrusion segments among the plurality of first extrusion segments and the first part of the second extrusion segments among the plurality of second extrusion segments opposite to the first part of the first extrusion segments along the first direction form a first extrusion group, and the second part of the first extrusion segments among the plurality of first extrusion segments and the second part of the second extrusion segments opposite to the second part of the first extrusion segments along the first direction form a second extrusion group; The first pressing group is configured to press a first wound cell portion of the deformed wound cell, and the second pressing group is configured to press a second wound cell portion of the deformed wound cell.

[0014] In this embodiment, according to the structural characteristics of the wound battery cell that undergoes deformation, multiple first extrusion segments and multiple second extrusion segments can be formed into a first extrusion group and a second extrusion group for the first wound battery cell part and the second wound battery cell part that undergoes deformation, and the first wound battery cell part and the second wound battery cell part can be extruded relatively independently, thereby meeting more specific extrusion molding process requirements of the wound battery cell.

[0015] In some embodiments, the battery cell expansion mechanism includes a first clamping assembly and a second clamping assembly arranged at intervals along the second direction, the first clamping assembly and the second clamping assembly are respectively configured to clamp the wound battery cell and move in opposite directions on the reference plane in a direction parallel to the second direction so that the wound battery cell is expanded along the reference plane; The orthographic projection of the first wound battery cell portion on the reference plane is located between the orthographic projections of the first clamping assembly and the second clamping assembly on the reference plane, respectively, and the second wound battery cell portion is located on both sides of the first wound battery cell portion along the second direction.

[0016] The orthographic projection of the first wound cell portion on the reference plane is located between the orthographic projections of the first clamping assembly and the second clamping assembly on the reference plane, respectively, so that the first extrusion group can perform an extrusion operation on the first wound cell portion while the first clamping assembly and the second clamping assembly are holding the wound cell, and it is not easy to interfere with the first clamping assembly and the second clamping assembly. The second wound cell portion located on both sides of the first wound cell portion along the second direction includes an arc-shaped corner area, which can be extruded by the second extrusion group to meet the specific extrusion needs of different parts of the wound cell.

[0017] In some embodiments, the first clamping assembly includes a first outer clamping needle and a first inner clamping needle spaced apart along the second direction, the second clamping assembly includes a second outer clamping needle and a second inner clamping needle spaced apart along the second direction, the first inner clamping needle and the second inner clamping needle are located between the first outer clamping needle and the second outer clamping needle, one of the first inner clamping needle and the second inner clamping needle is a fixed clamping needle, and the other is a rollable clamping needle.

[0018] In this embodiment, one of the first inner clamping needle and the second inner clamping needle is a fixed clamping needle and the other is a rollable clamping needle. The fixed clamping needle and the rollable clamping needle act on different positions of the inner ring of the wound battery cell and form different friction forces with the inner ring respectively. When the first clamping assembly and the second clamping assembly move in opposite directions to flatten the wound battery cell, the rollable clamping needle can rotate under the action of friction so that the first inner clamping needle and the second inner clamping needle are automatically located at the center plane of the wound battery cell. In addition, the fixed clamping needle and the rollable clamping needle can improve the stability of the clamped battery cell.

[0019] In some embodiments, the battery cell expansion mechanism is configured to detach from the wound battery cell while the first extrusion group is squeezing the first wound battery cell portion, and the second extrusion group is configured to squeeze the second wound battery cell portion while the first extrusion group is squeezing the first wound battery cell portion after the battery cell expansion mechanism detaches from the wound battery cell.

[0020] In this embodiment, the cell expansion mechanism is separated from the wound cell while the first extrusion group is still squeezing the first wound cell part, and then the second wound cell part is squeezed by the second extrusion group. Since the first wound cell part can maintain a relative position when being compressed, the force required for the cell expansion mechanism to open the wound cell is reduced, so that the cell can be formed by one stretch, saving the time consumed by multiple stretching actions and improving production efficiency. In addition, the distance and force required for the cell expansion mechanism to open the cell in this embodiment are lower, and deformation failure is less likely to occur, which is conducive to extending the service life of the cell expansion mechanism.

[0021] The first extrusion group maintains the extrusion of the first wound battery cell portion so that the pole piece of the first wound battery cell portion has no space for sagging and deformation, and accordingly the second wound battery cell portion can maintain a uniform gap in the arc-shaped corner area. On this basis, since the gap in the corner area is better controlled, the glue sticking equipment used in the related art to stick tape in the positive corner area to control the gap can be omitted. This saves equipment costs on the one hand, and reduces the pole piece utilization area affected by glue sticking on the other hand, which is beneficial to improve the pole piece utilization rate and battery capacity. In addition, in this embodiment, when removing the battery cell expansion mechanism, since the first wound battery cell portion has been constrained by the first extrusion group, the inner circle pole piece or isolation piece of the second wound battery cell portion is not easily taken out with the removal of the battery cell expansion mechanism, which effectively eliminates the problem of poor needle extraction that is prone to occur in the related art.

[0022] In some embodiments, the second extrusion group is configured to extrude the second wound cell portion by moving the first extrusion segment and the second extrusion segment in the second extrusion group toward each other, based on the center plane of the first wound cell portion extruded by the first extrusion group.

[0023] In this embodiment, the first extrusion segment and the second extrusion segment in the second extrusion group can move toward each other with the center plane of the first wound battery cell portion extruded into a flat shape as a reference to achieve the extrusion of the second wound battery cell portion. This can make the extrusion force on both sides of the second wound battery cell portion along the first direction more uniform, which is beneficial to improving the molding effect of the second wound battery cell portion.

[0024] In some embodiments, the first extrusion segment and the second extrusion segment in the second extrusion group are configured to move toward each other in a mirror-symmetrical manner relative to a center plane of the first wound battery cell portion to achieve extrusion of the second wound battery cell portion.

[0025] In this embodiment, the mirror-symmetrical movement toward each other can cause both sides of the second wound battery core portion along the first direction to be subjected to more uniform extrusion force, thereby effectively improving the molding effect of the second wound battery core portion.

[0026] In some embodiments, the second pressing group is configured not to contact the second wound cell portion when and before the cell expansion mechanism is detached from the wound cell, so that the second wound cell portion remains suspended.

[0027] In this embodiment, when the battery cell expansion mechanism is detached from the wound battery cell and before it is detached from the wound battery cell, the second wound battery cell portion is kept suspended. In this way, when the second wound battery cell portion is squeezed, the corner area will not be raised upward due to the support from the lower side, thereby reducing the possibility of inconsistent lengths of the upper and lower pole pieces in the upwardly raised corner area, which is prone to wrinkles during extrusion and shaping.

[0028] In some embodiments, after the first wound cell portion and the second wound cell portion are both squeezed, the time when the first squeeze group is separated from the first wound cell portion is different from the time when the second squeeze group is separated from the second wound cell portion.

[0029] In this embodiment, by making the time when the first extrusion group detaches from the first wound cell part different from the time when the second extrusion group detaches from the second wound cell part, the second extrusion group can be used to hold and limit the second wound cell part when the first extrusion group detaches from the first wound cell part, or the first extrusion group can be used to hold and limit the first wound cell part when the second extrusion group detaches from the second wound cell part. In this way, different parts of the wound cell and the cell extrusion mechanism detach at different times, reducing the risk of loosening of the pole piece or isolation member in the wound cell due to adhesion, thereby helping to improve the quality of the finished cell.

[0030] In some embodiments, the first extrusion group is configured to detach from the first wound cell portion while the second extrusion group is extruding the second wound cell portion, and then extrude the first wound cell portion; the second extrusion group is configured to detach from the second wound cell portion while the first extrusion group is extruding the first wound cell portion again.

[0031] In this embodiment, the second extrusion group extrudes the second wound cell part so as to form a limiting constraint effect at both ends of the upper and lower side pole pieces and the isolation member of the first wound cell part, so that when the first extrusion segment and the second extrusion segment in the first extrusion group move in a direction away from the first wound cell part, they can more easily detach from the upper and lower surfaces of the first wound cell part, reducing the risk of adhesion and loosening. The first extrusion group that has been separated from the first wound cell part can return to press the first wound cell part again, and at this time, the first extrusion segment and the second extrusion segment in the second extrusion group are moved in a direction away from the second wound cell part, so that the second extrusion group can more easily detach from the upper and lower surfaces of the second wound cell part.

[0032] In some embodiments, the first extrusion segment and the second extrusion segment in the first extrusion group have extrusion planes that are parallel to each other and perpendicular to the first direction, and at least one of the first extrusion segment and the second extrusion segment in the second extrusion group has an extrusion slope or an extrusion arc surface, and the spacing between the extrusion slopes or extrusion arc surfaces relative to each other along the first direction increases in the direction away from the first extrusion group.

[0033] In this embodiment, the first extrusion segment and the second extrusion segment in the first extrusion group both have extrusion planes, and their extrusion planes are parallel to each other and perpendicular to the first direction, so that the first extrusion group can extrude the second wound battery cell portion more smoothly. At least one of the first extrusion segment and the second extrusion segment in the second extrusion group may have an extrusion slope or an extrusion arc surface. Regardless of whether it is an extrusion slope or an extrusion arc surface, the spacing between the extrusion slopes or extrusion arc surfaces relative to each other along the first direction increases in the direction away from the first extrusion group. When extruding the corner area, it is possible to form an extrusion force on the circular arc corner in a process of gradually applying pressure from the inside to the outside, which can reduce the risk of wrinkling of the pole piece in the corner area and is conducive to improving the uniformity of the gap between the pole pieces.

[0034] In some embodiments, the battery cell comprises a laminated battery cell, a first portion of the first extruded segments among the plurality of first extruded segments and a first portion of the second extruded segments among the plurality of second extruded segments opposite to the first portion of the first extruded segments along the first direction form a first extrusion group, and a second portion of the first extruded segments among the plurality of first extruded segments and a second portion of the second extruded segments opposite to the second portion of the first extruded segments along the first direction form a second extrusion group; The first extrusion group is configured to extrude the first stacked cell portion of the stacked cell, and the second extrusion group is configured to extrude the second stacked cell portion of the stacked cell. After the first stacked cell portion and the second stacked cell portion are both squeezed, the time when the first extrusion group detaches from the first stacked cell portion is different from the time when the second extrusion group detaches from the second stacked cell portion.

[0035] In this embodiment, by making the time when the first extrusion group detaches from the first stacked cell part different from the time when the second extrusion group detaches from the second stacked cell part, the second stacked cell part can be held and limited by the second extrusion group when the first extrusion group detaches from the first stacked cell part, or the first stacked cell part can be held and limited by the first extrusion group when the second extrusion group detaches from the second stacked cell part. In this way, different parts of the stacked cell and the cell extrusion mechanism detach at different times, reducing the risk of loosening of the pole piece or isolation member in the stacked cell due to adhesion, thereby causing the pole piece layer gap to exceed the specification, which is beneficial to improving the quality of the finished cell.

[0036] In some embodiments, the battery core forming device further comprises: A plurality of groups of clamps are configured to clamp the side edges of the laminated battery core in at least two directions perpendicular to the first direction; Among them, the orthographic projection of the first stacked battery core part on the reference plane perpendicular to the first direction is located between the orthographic projections of the clamping positions of the multiple groups of clamps on the reference plane, and the second stacked battery core part is located outside the first stacked battery core part in at least two directions.

[0037] In this embodiment, after completing the separation between the first extrusion group and the first stacked cell portion, and the separation between the second extrusion group and the second stacked cell portion, the side portions of the stacked cell can be clamped by multiple groups of clamps so as to transfer the extruded stacked cell to a subsequent process.

[0038] In one aspect of the present disclosure, there is provided a cell forming method of the aforementioned cell forming device, comprising: By means of the battery cell expansion mechanism, the wound battery cell is expanded along a reference plane perpendicular to the first direction, so that the wound battery cell is deformed in a direction parallel to the reference plane; Extruding the first wound cell portion of the deformed wound cell by the first extrusion group; When the first extrusion group is extruding the first wound battery core portion, the battery core expansion mechanism is separated from the wound battery core; After the cell expansion mechanism is separated from the wound cell, the second wound cell portion is compressed by the second compression group while the first compression group is compressing the first wound cell portion.

[0039] In this embodiment, the cell expansion mechanism is separated from the wound cell while the first extrusion group is still squeezing the first wound cell part, and then the second wound cell part is squeezed by the second extrusion group. Since the first wound cell part can maintain a relative position when being compressed, the force required for the cell expansion mechanism to open the wound cell is reduced, so that the cell can be formed by one stretch, saving the time consumed by multiple stretching actions and improving production efficiency. In addition, the distance and force required for the cell expansion mechanism to open the cell in this embodiment are lower, and deformation failure is less likely to occur, which is conducive to extending the service life of the cell expansion mechanism.

[0040] The first extrusion group maintains the extrusion of the first wound battery cell portion so that the pole piece of the first wound battery cell portion has no space for sagging and deformation, and accordingly the second wound battery cell portion can maintain a uniform gap in the arc-shaped corner area. On this basis, since the gap in the corner area is better controlled, the glue sticking equipment used in the related art to stick tape in the positive corner area to control the gap can be omitted. This saves equipment costs on the one hand, and reduces the pole piece utilization area affected by glue sticking on the other hand, which is beneficial to improve the pole piece utilization rate and battery capacity. In addition, in this embodiment, when removing the battery cell expansion mechanism, since the first wound battery cell portion has been constrained by the first extrusion group, the inner circle pole piece or isolation piece of the second wound battery cell portion is not easily taken out with the removal of the battery cell expansion mechanism, which effectively eliminates the problem of poor needle extraction that is prone to occur in the related art.

[0041] In some embodiments, the step of extruding the second wound cell portion by the second extrusion group includes: The second wound cell portion is compressed by the first compression group with the center plane of the first wound cell portion compressed by the first compression group as a reference, and the second wound cell portion is compressed by the first compression segment and the second compression segment in the second compression group moving toward each other.

[0042] In this embodiment, the first extrusion segment and the second extrusion segment in the second extrusion group can move toward each other with the center plane of the first wound battery cell portion extruded into a flat shape as a reference to achieve the extrusion of the second wound battery cell portion. This can make the extrusion force on both sides of the second wound battery cell portion along the first direction more uniform, which is beneficial to improving the molding effect of the second wound battery cell portion.

[0043] In some embodiments, the battery core forming method further comprises: The first pressing group and the second pressing group are separated from the first wound battery cell portion and the second wound battery cell portion respectively at different times.

[0044] In this embodiment, by making the time when the first extrusion group detaches from the first wound cell part different from the time when the second extrusion group detaches from the second wound cell part, the second extrusion group can be used to hold and limit the second wound cell part when the first extrusion group detaches from the first wound cell part, or the first extrusion group can be used to hold and limit the first wound cell part when the second extrusion group detaches from the second wound cell part. In this way, different parts of the wound cell and the cell extrusion mechanism detach at different times, reducing the risk of loosening of the pole piece or isolation member in the wound cell due to adhesion, thereby helping to improve the quality of the finished cell.

[0045] In some embodiments, the step of causing the first extrusion group and the second extrusion group to detach from the first wound cell portion and the second wound cell portion at different times comprises: While the second extrusion group is extruding the second wound battery core portion, the first extrusion group is separated from the first wound battery core portion; Then, the first wound battery core portion is extruded by the first extrusion group; While the first extrusion group is still extruding the first wound battery core portion, the second extrusion group is separated from the second wound battery core portion.

[0046] In this embodiment, the second extrusion group extrudes the second wound cell part so as to form a limiting constraint effect at both ends of the upper and lower side pole pieces and the isolation member of the first wound cell part, so that when the first extrusion segment and the second extrusion segment in the first extrusion group move in a direction away from the first wound cell part, they can more easily detach from the upper and lower surfaces of the first wound cell part, reducing the risk of adhesion and loosening. The first extrusion group that has been separated from the first wound cell part can return to press the first wound cell part again, and at this time, the first extrusion segment and the second extrusion segment in the second extrusion group are moved in a direction away from the second wound cell part, so that the second extrusion group can more easily detach from the upper and lower surfaces of the second wound cell part.

[0047] In one aspect of the present disclosure, there is provided a cell forming method of the aforementioned cell forming device, comprising: Providing a laminated battery core, and respectively extruding a first laminated battery core portion and a second laminated battery core portion of the laminated battery core by the first extrusion group and the second extrusion group; The first pressing group and the second pressing group are separated from the first stacked cell portion and the second stacked cell portion respectively at different times.

[0048] In this embodiment, by making the time when the first extrusion group detaches from the first stacked cell part different from the time when the second extrusion group detaches from the second stacked cell part, the second stacked cell part can be held and limited by the second extrusion group when the first extrusion group detaches from the first stacked cell part, or the first stacked cell part can be held and limited by the first extrusion group when the second extrusion group detaches from the second stacked cell part. In this way, different parts of the stacked cell and the cell extrusion mechanism detach at different times, reducing the risk of loosening of the pole piece or isolation member in the stacked cell due to adhesion, thereby causing the pole piece layer gap to exceed the specification, which is beneficial to improving the quality of the finished cell.

[0049] In some embodiments, the plurality of second extrusion segments are located below the plurality of first extrusion segments, and the step of causing the first extrusion group and the second extrusion group to detach from the first stacked cell portion and the second stacked cell portion at different times comprises: Raise the first extrusion section located on the upper side of the first stacked battery core portion in the first extrusion group to separate from the first stacked battery core portion; The second extrusion section of the first extrusion group located at the lower side of the first laminated core part and the first extrusion section of the second extrusion group located at the upper side of the second laminated core part are both raised, so as to drive the laminated core to rise and separate from the second extrusion section of the second extrusion group located at the lower side of the second laminated core part; After the first laminated core portion contacts the first extrusion section located on the upper side of the first laminated core portion in the first extrusion group, the first extrusion section located on the upper side of the second laminated core portion in the second extrusion group continues to rise, so that the laminated core is separated from the first extrusion section located on the upper side of the second laminated core portion in the second extrusion group; The second laminated battery core portion is clamped by a plurality of groups of clamping jaws, and the first extrusion group is separated from the first laminated battery core portion.

[0050] In this embodiment, by lifting and lowering the first extrusion section and the second extrusion section in the first extrusion group and the second extrusion group, different parts of the stacked battery cell are separated from the first extrusion section and the second extrusion section at different times. Therefore, in the process of completing the separation of the stacked battery cell and the battery cell extrusion mechanism, the stacked battery cell is clamped by the clamping claws and moved to the subsequent process, thereby improving the quality of the stacked battery cell and facilitating the connection with the subsequent process. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0052] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the principle of wrinkles generated during the processing of wound batteries; Figure 2 It is a schematic diagram of the principle of adhesion of laminated cells during processing; Figure 3 It is a schematic diagram of the structure of some embodiments of the battery core forming device disclosed in the present invention; Figure 4-Figure 6 They are schematic diagrams of different distribution forms of the first extrusion section in the embodiment of the battery core forming device disclosed herein; Figure 7It is a schematic structural diagram of some other embodiments of the battery core forming device disclosed in the present invention; Figure 8 and Fig. 9 They are schematic diagrams of a process in which a cell expansion mechanism in an embodiment of a cell forming device disclosed herein expands a circular wound cell; Fig.10 It is a schematic diagram of the process of extruding and shaping a wound battery cell by the battery cell forming device embodiment of the present disclosure; Fig.11 (a) and (b) are Fig.10 (c) is a schematic diagram of two variations of the second extrusion group; Fig.12 It is a schematic diagram of a process in which a cell extrusion mechanism of an embodiment of a cell forming device disclosed herein is separated from a wound cell that has been shaped; Fig.13 is a schematic flow chart of some embodiments of the battery core forming method disclosed in the present invention; Fig.14 It is a schematic diagram of a process in which a cell extrusion mechanism of an embodiment of a cell forming device disclosed herein is separated from a laminated cell; Fig.15 It is a schematic diagram of the flow chart of other embodiments of the battery cell forming method disclosed in the present invention.

[0053] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components.

[0054] The reference numerals represent: 10. first extrusion portion; 11. first extrusion section; 20. Second extrusion part; 21. Second extrusion section; 22. Conveyor belt assembly; 221. Transmission wheel assembly; 222. Conveyor belt; 223. Belt tensioning mechanism; 2231. Buffer roller; 2232. Bracket; 30. Cell expansion mechanism; 31. First clamping assembly; 311. First outer clamping needle; 312. First inner clamping needle; 32. Second clamping assembly; 321. Second outer clamping needle; 322. Second inner clamping needle; 40. Gripping jaws; z, first direction; x, second direction; y, third direction; rp, reference plane; cp, center plane; eg1, first extrusion group; eg2, second extrusion group; JR, wound cell; JRp1, first wound cell part; JRp2, second wound cell part; SC, stacked cell; SCp1, first stacked cell part; SCp2, second stacked cell part. DETAILED DESCRIPTION

[0055] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0056] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] The following detailed description and drawings of the embodiments of the present disclosure are used to illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure, that is, the present disclosure is not limited to the described embodiments.

[0058] In the description of the present disclosure, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate positions or positional relationships only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0059] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present disclosure. In the description of the present disclosure, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0060] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0061] The term “plurality” appearing in the present disclosure refers to two or more (including two).

[0062] In the disclosed embodiments, the battery cell (also referred to as the electrode assembly) is a component in which an electrochemical reaction occurs in a battery cell. The battery cell may include a housing and one or more battery cells located in the housing. The battery cell may be wound with a first pole piece and a second pole piece having opposite polarities, and an isolating member may be provided between the first pole piece and the second pole piece.

[0063] A battery cell is the smallest unit that makes up a battery. A battery cell includes a battery core that can undergo an electrochemical reaction. A battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after the battery cell is discharged and can continue to be used.

[0064] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present disclosure are not limited thereto.

[0065] In some embodiments, the battery may include a housing and one or more battery cells contained in the housing. The housing may be made of metal, non-metal or a mixed material. The plurality of battery cells may be arranged along at least one of the length direction and the width direction of the housing. At least one row or column of battery cells may be arranged according to actual needs. One or more layers of battery cells may also be arranged in the height direction of the battery as needed.

[0066] Each battery cell is electrically connected, such as in series, parallel or hybrid, to achieve the required battery electrical performance parameters. Hybrid means that multiple battery cells are both in series and in parallel. Adjacent battery cells can be electrically connected via bus bars. Multiple battery cells are arranged in rows, and one or more rows of battery cells can be arranged in the box as needed. The box can be made of metal, non-metal or mixed materials.

[0067] In some embodiments, the battery may include a box and a battery module, wherein the box is used to provide a storage space for the battery module, and the battery module is installed in the box. A plurality of battery cells may be connected in series, in parallel, or in a mixed connection to form a battery module, and then a plurality of battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box.

[0068] In addition to the battery cell and the shell, the battery cell may also include an end cover. The shell has a receiving cavity for receiving the battery cell and an open end connected to the receiving cavity. The end cover covers the open end. The shape of the shell may be, but is not limited to, a square shell.

[0069] The battery cell may include a first pole piece and a second pole piece with opposite polarities, and also include a separator disposed between the first pole piece and the second pole piece. In some embodiments, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece. In other embodiments, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive pole piece and the negative pole piece. The separator is disposed between the positive pole piece and the negative pole piece, which can prevent the positive and negative poles from short-circuiting, while allowing active ions to pass through.

[0070] In some embodiments, the positive electrode sheet may include a positive current collector substrate and a positive active material layer disposed on at least one surface of the positive current collector substrate.

[0071] As an example, the positive electrode current collector substrate has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector substrate.

[0072] As an example, the positive electrode current collector substrate may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by placing a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as positive electrode active material layers of batteries may also be used. These positive electrode active material layers may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0074] In some embodiments, the negative electrode sheet may include a negative current collector substrate.

[0075] As an example, the negative electrode current collector substrate can be a metal foil, a foamed metal or a composite current collector. For example, as a metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by placing a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0077] As an example, the negative electrode current collector substrate has two surfaces facing each other in its thickness direction, and the negative electrode active material layer is disposed on any one or both of the two facing surfaces of the negative electrode current collector substrate.

[0078] As an example, the negative electrode active material layer may adopt the negative electrode active material layer for battery cells known in the art. As an example, the negative electrode active material layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as negative electrode active material layers for batteries may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0079] In some embodiments, the material of the positive electrode current collector substrate may be aluminum, and the material of the negative electrode current collector substrate may be copper.

[0080] In some embodiments, the separator is a separator. The present disclosure has no particular limitation on the type of separator, and any known porous separator with good chemical stability and mechanical stability can be selected.

[0081] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive electrode sheet and the negative electrode sheet, or it can be located between the positive electrode sheet and the negative electrode sheet and attached to the surface of the positive electrode sheet and / or the surface of the negative electrode sheet.

[0082] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0083] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present disclosure has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0084] As an example, the liquid electrolyte includes an electrolyte salt and a solvent.

[0085] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0086] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0087] As an example, the gel electrolyte includes a polymer as the electrolyte skeleton network, combined with an ionic liquid-lithium salt.

[0088] As examples, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0089] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0090] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0091] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0092] In some embodiments, the battery cell is a wound battery cell, which can be formed by winding a positive electrode sheet, a negative electrode sheet and a separator. In other embodiments, the battery cell is a laminated battery cell, which can be formed by stacking a positive electrode sheet, a negative electrode sheet and a separator.

[0093] One or more positive electrode sheets, negative electrode sheets and separators may be provided respectively. As an example, a positive electrode sheet, a separator, a negative electrode sheet and another separator are stacked and wound into a wound battery cell. As another example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked, and a folded separator passes between each group of adjacent positive electrode sheets and negative electrode sheets from left to right and then from right to left.

[0094] Figure 1 This is a schematic diagram of the principle of wrinkles in the wound battery cell during processing. Figure 1 In the related art, the equipment for preparing wound battery cells JR uses a circular winding needle to wind the positive electrode sheet, negative electrode sheet and separator wound together in sequence. After winding, the battery cell is stretched from the initial round shape to a flat shape by a CLP with a blanking clamp needle, and then Figure 1 As shown in (a), the stretched wound battery cell JR is placed on the lower pressing plate lEP by the blanking clamp needle CLP. Figure 1 In (b), the upper pressing plate uEP is moved downward and contacts the upper surface of the wound battery cell JR so that the wound battery cell JR maintains a flat state after being stretched.

[0095] refer to Figure 1 (c), loosen the blanking clamp CLP, and pull the blanking clamp CLP out of the wound battery cell JR. At this time, the wound battery cell JR is as follows Figure 1 As shown in (d), the lack of tension on the corners on both sides to stretch the inner pole pieces causes the upper pole pieces of the wound battery cell JR to collapse downward under the influence of gravity to form an arc, causing the pole pieces on both sides to loosen and move toward the middle, resulting in redundancy of the inner pole pieces.

[0096] refer to Figure 1 (e) When the upper pressure plate uEP applies a downward extrusion force F to the wound battery cell JR to compress the wound battery cell JR to form it, the upper half of the inner circle of the electrode sheets is redundant and has no space to extend. As a result, after the wound battery cell JR is flattened, the negative electrode sheets of the inner circle are wrinkled, or the negative and positive electrode sheets of the inner circle are wrinkled, or the gap (Gap) between the inner circle electrode sheets exceeds the specification, which puts the battery cell at risk of reduced capacity and reliability.

[0097] Figure 2 This is a schematic diagram of the principle of adhesion of stacked cells during processing. Figure 2 (a), in the related art, after hot pressing or cold pressing the laminated battery cell SC, it is necessary to separate the pressing plate from the laminated battery cell SC. Figure 2As shown in (b), the upper pressure plate uEP moves upward. The bonding force between the upper pressure plate uEP and the uppermost diaphragm of the stacked battery cell SC due to factors such as pressure difference adsorption or viscosity may exceed the bonding force between the electrode sheet and the diaphragm of the stacked battery cell SC. As the upper pressure plate uEP rises, the upper electrode sheet of the stacked battery cell SC may be peeled off from the diaphragm, resulting in a large layer gap and causing the battery cell electrode sheet to loosen, or the stacked battery cell SC that is adhered and risen may fall under the action of gravity and change its position. As a result, the stacked battery cell SC may be crushed due to inaccurate positioning when the robot is transferring it, thereby causing the risk of scrapping the stacked battery cell SC.

[0098] In view of this, the embodiments of the present disclosure provide a battery cell forming device and method, which are beneficial to improving the quality of battery cells.

[0099] In one aspect of the present disclosure, a battery cell forming device is provided, comprising a battery cell pressing mechanism for applying a pressing operation to a battery cell, the battery cell pressing mechanism comprising: A first extrusion portion, comprising a plurality of first extrusion segments that can move independently, and configured to make the plurality of first extrusion segments move toward or away from the battery cell in a synchronous or asynchronous manner; and The second extrusion portion is located at the opposite side of the first extrusion portion along the first direction, and includes a plurality of second extrusion segments that can move independently, and is configured to make the plurality of second extrusion segments move closer to or farther from the battery cell in a synchronous or asynchronous manner, Wherein, the first direction is parallel to the extrusion direction of the battery cell extrusion mechanism; The plurality of first extrusion segments can be divided into at least two groups of first extrusion segments that move relatively independently, and / or the plurality of second extrusion segments can be divided into at least two groups of second extrusion segments that move relatively independently.

[0100] In the present embodiment, the first extrusion part in the battery cell extrusion mechanism includes a plurality of first extrusion segments capable of independent movement, and the second extrusion part located on the opposite side thereof along the first direction includes a plurality of second extrusion segments capable of independent movement, and these first extrusion segments and the second extrusion segments can both move closer to or farther away from the battery cell in a synchronous or asynchronous manner, so that these first extrusion segments and the second extrusion segments can perform the same or different movements on different parts of the battery cell at the same time or at different times as needed, so as to conveniently perform appropriate operations on the battery cell as needed during the battery cell forming process, such as extruding, holding, and positioning different parts of the battery cell, thereby improving the flexibility and adaptability of the process, which is conducive to improving the quality of the battery cell; and, the first extrusion segments and the second extrusion segments can both be divided into at least two groups, and the groups can move relatively independently, thereby meeting the process requirements of more flexible and rich battery cell forming.

[0101] Figure 3 Schematic diagram of the structure of some embodiments of the battery cell forming device disclosed in the present invention. Figure 3 , an embodiment of the present disclosure provides a battery cell forming device, including a battery cell pressing mechanism for applying an extrusion operation to a battery cell. The battery cell pressing mechanism includes a first pressing part 10 and a second pressing part 20. The first pressing part 10 includes a plurality of first pressing segments 11 that can move independently and separately, and is configured to move the plurality of first pressing segments 11 closer to or farther from the battery cell in a synchronous or asynchronous manner. The second pressing part 20 is located on the opposite side of the first pressing part 10 along a first direction z, and includes a plurality of second pressing segments 21 that can move independently and separately, and is configured to move the plurality of second pressing segments 21 closer to or farther from the battery cell in a synchronous or asynchronous manner. The first direction z is parallel to the extrusion direction of the battery cell pressing mechanism.

[0102] The battery cell may include a wound battery cell JR or a laminated battery cell SC. The battery cell extrusion mechanism may shape the wound battery cell JR by extruding the wound battery cell JR, for example, forming it into a flat battery cell structure. The battery cell extrusion mechanism may also shape the laminated battery cell SC by hot pressing or cold pressing the laminated battery cell SC.

[0103] The first extrusion part 10 and the second extrusion part 20 are located on opposite sides along the first direction z, and the two can move toward each other or in opposite directions along a direction parallel to the first direction z. The two can also move in the same direction as needed, or the first extrusion part 10 (or the second extrusion part 20) of the first extrusion part 10 and the second extrusion part 20 remains stationary, and the second extrusion part 20 (or the first extrusion part 10) moves away from or approaches the first extrusion part 10 along a direction parallel to the first direction z.

[0104] The first direction z is parallel to the extrusion direction of the battery cell extrusion mechanism. The extrusion direction refers to the direction in which the battery cell extrusion mechanism applies the extrusion force to the battery cell. The first extrusion portion 10 and the second extrusion portion 20 have different positions relative to the battery cell, so the directions in which the extrusion forces are applied to the battery cell are opposite, but both are parallel to the first direction z. In some embodiments, the first direction z may be a vertically upward or vertically downward direction. Accordingly, the second extrusion portion 20 may be located below the first extrusion portion 10 in the vertical direction. In other embodiments, the first direction z may also be other directions, such as a direction obliquely intersecting with a horizontal plane or a horizontal direction.

[0105] exist Figure 3 In the figure, the dashed boxes respectively illustrate the multiple first extrusion sections 11 in the first extrusion part 10 and the multiple second extrusion sections 21 in the second extrusion part 20. Here, the number of the first extrusion sections 11 can be more than two, and the number of the second extrusion sections 21 can be more than two.

[0106] The multiple first extrusion segments 11 in the first extrusion part 10 can move independently of each other. They can be controlled to move synchronously, or they can move closer to or farther away from the battery cell in an asynchronous manner, such as moving in the same direction but at different speeds, moving in opposite directions, or a part of the first extrusion segments 11 is stationary while another part of the first extrusion segments 11 moves, etc.

[0107] The plurality of first extrusion segments 11 may be connected to a driving component so as to move under the driving action of the driving component. The driving component may use a motor, a cylinder, a hydraulic cylinder, a pneumatic motor, a hydraulic motor, etc. to output the driving force. Each first extrusion segment 11 may be a structure such as an extrusion block or an extrusion plate, which may have an extrusion plane or an extrusion arc surface to act on the surface of the battery cell.

[0108] The multiple second extrusion segments 21 in the second extrusion part 20 can move independently of each other. They can be controlled to move synchronously, or they can move closer to or farther away from the battery cell in an asynchronous manner, such as moving in the same direction but at different speeds, moving in opposite directions, or a part of the second extrusion segments 21 is stationary while another part of the second extrusion segments 21 moves, etc.

[0109] The plurality of second extrusion sections 21 may be connected to a driving component so as to move under the driving action of the driving component. The driving component may use a motor, a cylinder, a hydraulic cylinder, a pneumatic motor, a hydraulic motor, etc. to output the driving force. Each second extrusion section 21 may be a structure such as an extrusion block or an extrusion plate, which may have an extrusion plane or an extrusion arc surface to act on the surface of the battery cell.

[0110] exist Figure 3 In the figure, looking at the cell extrusion mechanism and the cell from a perspective perpendicular to the first direction z, it can be seen that the multiple first extrusion segments 11 and the multiple second extrusion segments 21 each correspond to a different part of the cell, so that they can squeeze different parts of the cell when applying extrusion force to the cell. Moreover, the operation of applying extrusion to or leaving the cell can be performed at different times, for example, a part of the first extrusion segment 11 and a part of the second extrusion segment 21 first squeeze a part of the cell, and then keep squeezing the part of the cell, so that another part of the first extrusion segment 11 and another part of the second extrusion segment 21 squeeze the other parts of the cell, thereby effectively controlling the movement of the electrode and the separator in the cell to meet the requirements of cell preparation.

[0111] In the present embodiment, the first extrusion portion 10 in the battery cell extrusion mechanism includes a plurality of first extrusion segments 11 capable of independent movement, and the second extrusion portion 20 located on the opposite side thereof along the first direction z includes a plurality of second extrusion segments 21 capable of independent movement, and these first extrusion segments 11 and second extrusion segments 21 can move closer to or farther away from the battery cell in a synchronous or asynchronous manner, which enables these first extrusion segments 11 and second extrusion segments 21 to perform the same or different movements on different parts of the battery cell at the same time or different times as needed, so as to conveniently perform appropriate operations on the battery cell as needed during the battery cell forming process, such as extruding, holding, positioning and other operations on different parts of the battery cell, thereby improving the flexibility and adaptability of the process, which is beneficial to improving the quality of the battery cell.

[0112] Figure 4-Figure 6 They are schematic diagrams of different distribution forms of the first extrusion section in the embodiment of the battery core forming device disclosed in the present invention. Figure 4-Figure 6 In the figure, the first extrusion portion 10 is viewed from a perspective parallel to the first direction z. It can be seen that Figure 4 The first extrusion portion includes three first extrusion segments 11 , and the three first extrusion segments 11 are arranged along the second direction x. Figure 5 The first extrusion portion in the middle includes more first extrusion segments 11, which are divided into three groups of first extrusion segments 11 arranged along the second direction x, the left and right groups of first extrusion segments 11 each include four first extrusion segments 11 arranged along the third direction y, and the middle group of first extrusion segments 11 includes four first extrusion segments 11 arranged in an array along the second direction x and the third direction y. Figure 6 The first extrusion part 10 in the embodiment includes two first extrusion sections 11, one of which has a hollow area, and the other first extrusion section 11 is located in the hollow area. The two first extrusion sections 11 are also arranged along the second direction x and the third direction y. The plurality of second extrusion sections 21 in the second extrusion part 20 can refer to Figure 4-Figure 6 The arrangement is not described here.

[0113] refer to Figure 3-Figure 6 In some embodiments, the plurality of first extrusion segments 11 are arranged at intervals along at least one direction perpendicular to the first direction z; and / or the plurality of second extrusion segments 21 are arranged at intervals along at least one direction perpendicular to the first direction z.

[0114] It can be seen that in Figure 3 , Figure 4 , Figure 5 and Figure 6 In the embodiment, a plurality of first extrusion segments 11 are arranged at intervals along a second direction x, and the second direction x is perpendicular to the first direction z. Figure 5 and Figure 6In the embodiment, the plurality of first extrusion segments 11 are arranged at intervals along the third direction x, and the third direction y is perpendicular to the first direction z. In addition to the second direction x and the third direction y, the plurality of first extrusion segments 11 may also be arranged at intervals along other directions perpendicular to the first direction z. Similarly, the plurality of second extrusion segments 21 are arranged at intervals along at least one direction perpendicular to the first direction z, such as the second direction x and the third direction y.

[0115] In this embodiment, a plurality of first extrusion segments 11 are arranged at intervals in at least one direction perpendicular to the first direction z, and / or a plurality of second extrusion segments 21 are arranged at intervals in at least one direction perpendicular to the first direction z, so that the plurality of first extrusion segments 11 and / or the plurality of second extrusion segments 21 can apply extrusion force to different parts of the battery cell in the arrangement direction, thereby meeting the flexible process requirements during battery cell molding.

[0116] refer to Figure 3 In some embodiments, the number of the plurality of first extrusion segments 11 is the same as the number of the plurality of second extrusion segments 21, the plurality of first extrusion segments 11 correspond one-to-one to the plurality of second extrusion segments 21, and are respectively opposite to each other along the first direction z.

[0117] like Figure 3 As shown, the first extrusion portion 10 includes three first extrusion segments 11, and the second extrusion portion 20 includes three second extrusion segments 21. The number of the first extrusion segments 11 and the second extrusion segments 21 is the same, one-to-one corresponding and opposite along the first direction z. In other embodiments, Figure 4-Figure 6 , the number and distribution of the plurality of first extrusion segments 11 are shown, and the number and distribution of the obscured second extrusion segments may be completely consistent with the plurality of first extrusion segments 11 .

[0118] In this embodiment, by making the number of the first extrusion segments 11 and the second extrusion segments 21 the same, they are not only in one-to-one correspondence but also opposite to each other along the first direction z. This makes it convenient to group the first extrusion segments 11 and the second extrusion segments 21 according to different parts of the battery cell, and enables the corresponding parts of the battery cell to obtain basically the same extrusion effect.

[0119] refer to Figure 3-Figure 6 In some embodiments, the plurality of first extrusion segments 11 can be divided into at least two groups of first extrusion segments 11 that move relatively independently; and / or, the plurality of second extrusion segments 21 can be divided into at least two groups of second extrusion segments 21 that move relatively independently.

[0120] like Figure 3-Figure 6 As shown, more first extrusion segments 11 can be provided so as to group the first extrusion segments 11 according to factors such as the size and position of the battery cells. Figure 5The four smaller first extrusion segments 11 on the left and right sides are divided into two groups or one group to achieve the extrusion operation on the peripheral area of ​​the battery cell (such as the corner area of ​​the wound battery cell); the four larger first extrusion segments 11 in the middle are divided into one group to achieve the extrusion operation on the central area of ​​the battery cell (such as the relatively flat middle area of ​​the wound battery cell). Figure 6 In the embodiment, the first extrusion segments 11 are divided into two groups, and each group of first extrusion segments 11 includes one first extrusion segment 11. Figure 4 In the embodiment, the first extrusion segments 11 are divided into two groups, the two first extrusion segments 11 located on the left and right sides are divided into one group, and the first extrusion segments 11 located in the middle are divided into one group.

[0121] In this embodiment, the first extrusion section 11 and the second extrusion section 21 can be divided into at least two groups, and the groups can move relatively independently, thereby meeting the process requirements of more flexible and rich battery cell molding.

[0122] Figure 7 Schematic diagrams of other embodiments of the battery cell forming device disclosed in the present invention. Figure 7 In some embodiments, the plurality of second extrusion segments 21 are located below the plurality of first extrusion segments 11, and the second extrusion portion 20 further includes a transmission belt assembly 22, the transmission belt assembly 22 includes a transmission wheel group 221 and a transmission belt 222, and the transmission belt 222 is wound around the transmission wheel group 221 and the upper surface of the plurality of second extrusion segments 21 to support the battery cell.

[0123] The conveyor belt 222 passes through the transmission wheel group 221, and the direction of the conveyor belt 222 can be guided by the transmission wheel in the transmission wheel group 221. In addition, the formed battery cells can be transferred to other stations through the conveyor belt 222 by rotating the transmission wheel. The conveyor belt 222 passing through the upper surfaces of multiple second extrusion sections 21 can slide relative to the upper surface of the second extrusion section 21 as each second extrusion section 21 moves. The conveyor belt 222 can be made of a material with a certain degree of flexibility.

[0124] In this embodiment, the conveyor belt assembly 22 can convey the battery cells, and the conveyor belt 222 passing through the transmission wheel assembly 221 and the second extrusion section 21 can support the battery cells to reduce the possibility of the gap between the second extrusion sections 21 causing indentations on the surface of the battery cells.

[0125] refer to Figure 7In some embodiments, the conveyor belt assembly 22 also includes a belt tensioning mechanism 223, which includes a buffer roller 2231 and a bracket 2232. The buffer roller 2231 is movably disposed on the bracket 2232, and the conveyor belt 222 also passes around the buffer roller 2231, so that when at least part of the multiple second extrusion segments 21 moves, the tension of the conveyor belt 222 can be adjusted by moving the buffer roller 2231 relative to the bracket 2232.

[0126] exist Figure 7 In the embodiment, the buffer roller 2231 can move on the bracket 2232. By adjusting the position of the buffer roller 2231, the tension of the conveyor belt 222 can be adjusted in coordination with the movement of the second extrusion section 21. Figure 7 In the embodiment, the second extrusion sections 21 on the left and right sides remain stationary. When the second extrusion section 21 in the middle moves upward, the conveyor belt 222 can be driven to rise, and the buffer roller 2231 moves to the right accordingly, releasing a certain length of the conveyor belt 222 to prevent the conveyor belt 222 from deviating from the second extrusion section 21 or being damaged by excessive tension on the conveyor belt 222.

[0127] Figure 8 and Fig. 9 They are schematic diagrams of a process in which a cell expansion mechanism in an embodiment of the cell forming device disclosed herein expands a circular wound cell. Fig.10 It is a schematic diagram of the process of extruding and shaping a wound battery cell by the battery cell forming device embodiment of the present disclosure.

[0128] refer to Figure 3 , Figure 8-Figure 10 In some embodiments, the battery cell includes a wound battery cell JR, and the battery cell forming device further includes a battery cell expansion mechanism 30, and the battery cell expansion mechanism 30 is configured to expand the wound battery cell JR along a reference plane rp perpendicular to the first direction z, so that the wound battery cell JR is deformed in a direction parallel to the reference plane rp. The first part of the first extruded segments 11 in the plurality of first extruded segments 11 and the first part of the second extruded segments 21 in the plurality of second extruded segments 21 opposite to the first part of the first extruded segments 11 along the first direction z form a first extrusion group eg1, and the second part of the first extruded segments 11 in the plurality of first extruded segments 11 and the second part of the second extruded segments 21 in the plurality of second extruded segments 21 opposite to the second part of the first extruded segments 11 along the first direction z form a second extrusion group eg2. The first pressing group eg1 is configured to press the first wound cell portion JRp1 of the deformed wound cell JR, and the second pressing group eg2 is configured to press the second wound cell portion JRp2 of the deformed wound cell JR.

[0129] exist Figure 8 In the winding cell JR, the upper winding needle uWN and the lower winding needle lWN form a winding needle assembly to clamp the stacked positive electrode sheet, negative electrode sheet and separator, and form the winding cell JR by winding. The inner clamping needle in the cell expansion mechanism 30 extends into the cell along the notches of the upper winding needle uWN and the lower winding needle lWN, and the outer clamping needle is opposite to the inner clamping needle outside the cell. The inner and outer clamping needles cooperate to clamp the two sides of the cell, so that the upper winding needle uWN and the lower winding needle lWN are loosened and pulled out of the cell.

[0130] like Fig. 9 and Fig.10 As shown in (a), for the wound battery cell JR, the battery cell expansion mechanism 30 can stretch the wound battery cell JR along a reference plane rp perpendicular to the first direction z, so that the wound battery cell JR is deformed in a direction parallel to the reference plane rp. Figure 8 The cylindrical wound cell JR shown is stretched out into Fig. 9 Flattened form shown.

[0131] exist Fig. 9 In the figure, the deformation direction of the wound battery cell JR is indicated by the bidirectional black arrows. It can be seen that the wound battery cell JR has arc-shaped corner areas on both sides, and a relatively flat middle area is between the corner areas on both sides. Considering the structural characteristics of the deformed wound battery cell JR, the multiple first extrusion segments 11 and the multiple second extrusion segments 21 are divided into extrusion groups for performing extrusion operations on different parts of the wound battery cell JR.

[0132] Combination Figure 3 and Fig.10 (a), the first extrusion segment 11 and the second extrusion segment 21 cooperate with each other to form a first extrusion group eg1 and a second extrusion group eg2, wherein the first extrusion group eg1 is used to extrude the first wound cell part JRp1 of the deformed wound battery cell JR, and the second extrusion group eg2 is used to extrude the second wound cell part JRp2 of the deformed wound battery cell JR.

[0133] For example, Fig.10 In (a), the first wound cell portion JRp1 may be a relatively flat middle region of the wound cell JR, and the second wound cell portion JRp2 may be arc-shaped corner regions on both sides of the wound cell JR. Accordingly, Figure 3 The first extrusion group eg1 indicated by the double-dotted line includes the first extrusion section 11 and the second extrusion section 21 located at the upper and lower sides in the middle, and the second extrusion group eg2 indicated by the double-dotted line includes the first extrusion section 11 and the second extrusion section 21 located at both sides of the first extrusion group eg1.

[0134] The lateral distance from the edge of the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 to the inner circle of the arc-shaped corner area can be within 30 mm. The lateral range covered by the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 can also be determined according to the position of the positive and negative electrode ears, even if the positive and negative electrode ears are located within the lateral range covered by the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1.

[0135] In this embodiment, according to the structural characteristics of the deformed wound battery cell JR, a plurality of first extrusion segments 11 and a plurality of second extrusion segments 21 can be formed into a first extrusion group eg1 and a second extrusion group eg2 for the first wound battery cell part JRp1 and the second wound battery cell part JRp2 of the deformed wound battery cell JR, and the first wound battery cell part JRp1 and the second wound battery cell part JRp2 can be extruded relatively independently, thereby meeting more specific extrusion molding process requirements of the wound battery cell JR.

[0136] refer to Fig. 9 and Fig.10 (a), in some embodiments, the cell expansion mechanism 30 includes a first clamping assembly 31 and a second clamping assembly 32 arranged at intervals along the second direction x, the first clamping assembly 31 and the second clamping assembly 32 are respectively configured to clamp the wound cell JR, and move in the opposite direction along the direction parallel to the second direction x on the reference plane rp, so that the wound cell JR is stretched along the reference plane rp. The orthographic projection of the first wound cell portion JRp1 on the reference plane rp is located between the orthographic projections of the first clamping assembly 31 and the second clamping assembly 32 on the reference plane rp, and the second wound cell portion JRp2 is located on both sides of the first wound cell portion JRp1 along the second direction x.

[0137] The first clamping assembly 31 and the second clamping assembly 32 can clamp the wound battery cell JR at different positions of the wound battery cell JR, and the clamping positions of the first clamping assembly 31 and the second clamping assembly 32 can both be located on the reference plane rp. The first clamping assembly 31 and the second clamping assembly 32 move in opposite directions parallel to the second direction x, and can stretch the wound battery cell JR along the second direction x, so that the size of the wound battery cell JR in the second direction x is increased, and the size in the first direction z is reduced.

[0138] The orthographic projection of the first wound cell portion JRp1 on the reference plane rp is located between the orthographic projections of the first clamping assembly 31 and the second clamping assembly 32 on the reference plane rp, respectively, so that the first extrusion group eg1 can perform the extrusion operation on the first wound cell portion JRp1 while the first clamping assembly 31 and the second clamping assembly 32 are holding the wound cell JR, and it is not easy to interfere with the first clamping assembly 31 and the second clamping assembly 32. The second wound cell portion JRp2 located on both sides of the first wound cell portion JRp1 along the second direction x includes an arc-shaped corner area, which can be extruded by the second extrusion group eg2 to meet the specific extrusion needs of different parts of the wound cell JR.

[0139] refer to Figure 8 , Fig. 9 and Fig.10 (a), in some embodiments, the first clamping assembly 31 includes a first outer clamping needle 311 and a first inner clamping needle 312 spaced apart along the second direction x, the second clamping assembly 32 includes a second outer clamping needle 321 and a second inner clamping needle 322 spaced apart along the second direction x, the first inner clamping needle 312 and the second inner clamping needle 322 are located between the first outer clamping needle 311 and the second outer clamping needle 321, one of the first inner clamping needle 312 and the second inner clamping needle 322 is a fixed clamping needle, and the other is a rollable clamping needle.

[0140] The inner clamping needle here refers to the clamping needle mechanism that extends into the inner circle of the wound battery cell to clamp the battery cell after winding, and the outer clamping needle refers to the clamping needle mechanism that is set on the outer side of the wound battery cell to cooperate with the inner clamping needle to clamp the battery cell.

[0141] In this embodiment, one of the first inner clamping needle 312 and the second inner clamping needle 322 is a fixed clamping needle and the other is a rollable clamping needle. The fixed clamping needle and the rollable clamping needle act on different positions of the inner ring of the wound battery cell JR and form different friction forces with the inner ring respectively. When the first clamping assembly 31 and the second clamping assembly 32 move in opposite directions to flatten the wound battery cell JR, the rollable clamping needle can rotate under the action of friction so that the first inner clamping needle 312 and the second inner clamping needle 322 are automatically located at the center plane of the wound battery cell JR. In addition, the fixed clamping needle combined with the rollable clamping needle can improve the stability of the clamped battery cell.

[0142] refer to Fig.10(a)-(d), in some embodiments, the battery cell expansion mechanism 30 is configured to detach from the wound battery cell JR while the first extrusion group eg1 is extruding the first wound battery cell part JRp1, and the second extrusion group eg2 is configured to squeeze the second wound battery cell part JRp2 while the first extrusion group eg1 is extruding the first wound battery cell part JRp1 after the battery cell expansion mechanism 30 detaches from the wound battery cell JR.

[0143] exist Fig.10 In (a), the wound cell JR is placed between the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 by the cell expansion mechanism 30, and the first extrusion group eg1 extrudes the first wound cell portion JRp1. At this time, the cell expansion mechanism 30 opens the wound cell JR, and the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 extrudes the first wound cell portion JRp1 in the middle.

[0144] exist Fig.10 In (b), the first extrusion group eg1 maintains the state of extruding the first wound battery cell part JRp1, and releases the first outer clamping pin 311 and the first inner clamping pin 312 in the first clamping assembly 31, as well as the second outer clamping pin 321 and the second inner clamping pin 322 in the second clamping assembly 32, so that the battery cell expansion mechanism 30 is separated from the wound battery cell JR. It can be seen that since the first wound battery cell part JRp1 has been clamped by the first extrusion group eg1, the second wound battery cell part JRp2 located on both sides of the first wound battery cell part JRp1 can maintain the arc angle as much as possible, so that it is not easy for the inner corner to loosen due to the battery cell expansion mechanism 30 being separated from the wound battery cell JR, resulting in the risk of the pole sheet layer gap exceeding the specification. The pole sheet layer gap here refers to the gap between adjacent layers of pole sheets in the battery cell, such as the gap between the alternating positive pole sheets and negative pole sheets.

[0145] exist Fig.10 In (c), the first extrusion group eg1 keeps extruding the first wound cell portion JRp1, and the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 move toward each other to extrude the second wound cell portions JRp2 on both sides of the first wound cell portion JRp1 until the first extrusion segment 11 and the second extrusion segment 21 .... Fig.10The flat wound cell JR shown in (d). The first wound cell part JRp1 is pressed by the first extrusion group eg1, so that the second wound cell part JRp2 can maintain the arc angle as much as possible based on the elastic deformation force of the pole piece. On this basis, the second extrusion group eg2 extrudes the second wound cell part JRp2, which can effectively control the gap between the pole piece layers (for example, the gap does not exceed 120μm), reducing the risk of the gap exceeding the specification.

[0146] In the related art, the wound battery cell JR often needs to be stretched and extruded multiple times during molding to meet the gap specification requirements between the electrode layers. If you want to mold by a single stretching and extrusion method, you need to apply a large pulling force to the battery cell with the clamping needle to maintain the stability of the gap between the electrode layers, but this may cause the electrode or diaphragm to break, and may also cause the clamping needle to deform. In contrast, in this embodiment, the battery cell expansion mechanism 30 is separated from the wound battery cell JR while the first extrusion group eg1 keeps squeezing the first wound battery cell part JRp1, and then the second wound battery cell part JRp2 is squeezed by the second extrusion group eg2. Since the first wound battery cell part JRp1 can maintain a relative position when being pressed, the force requirement for the battery cell expansion mechanism 30 to open the wound battery cell JR is reduced, so that the battery cell molding can be achieved by one stretching, saving the time consumed by multiple stretching actions and improving production efficiency. Furthermore, in this embodiment, the distance and force required for the battery cell expansion mechanism 30 to open the battery cells are lower, and deformation failure is less likely to occur, which is beneficial for extending the service life of the battery cell expansion mechanism 30 .

[0147] In the related art, the clamping needle can maintain the gap between the electrode layers by pulling when stretching the wound battery cell JR. Once the clamping needle is removed from the wound battery cell JR, the electrode in the middle area may sag and the gap in the corner area may be uneven. In contrast, in this embodiment, the first extrusion group eg1 maintains the extrusion of the first wound battery cell part JRp1, so that the electrode of the first wound battery cell part JRp1 has no space to sag and deform, and accordingly the second wound battery cell part JRp2 can maintain a uniform gap in the arc-shaped corner area. On this basis, since the gap in the corner area is better controlled, the glue sticking equipment used in the related art to stick tape in the positive corner area to control the gap can be omitted. This saves equipment costs on the one hand, and reduces the electrode utilization area affected by glue sticking on the other hand, which is beneficial to improve the electrode utilization rate and battery capacity.

[0148] In addition, in this embodiment, when the battery cell expansion mechanism 30 is removed, since the first wound battery cell portion JRp1 has been constrained by the first extrusion group eg1, the inner ring electrode or isolation piece of the second wound battery cell portion JRp2 is not easily taken out with the removal of the battery cell expansion mechanism 30, effectively eliminating the problem of poor needle extraction that is prone to occur in related technologies.

[0149] refer to Fig.10 (c), in some embodiments, the second extrusion group eg2 is configured to extrude the second wound cell portion JRp2 by the opposite movement of the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2, with the center plane cp of the first wound cell portion JRp1 extruded by the first extrusion group eg1 as a reference.

[0150] In this embodiment, the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 can move toward each other based on the center plane cp of the first wound battery cell portion JRp1 extruded into a flat shape to achieve the extrusion of the second wound battery cell portion JRp2. The extrusion force on both sides of the second wound battery cell portion JRp2 along the first direction z can be relatively uniform, which is beneficial to improving the molding effect of the second wound battery cell portion JRp2.

[0151] refer to Fig.10 (c), in some embodiments, the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 are configured to move toward each other in a mirror-symmetrical manner relative to the central plane cp of the first wound battery cell portion JRp1 to achieve extrusion of the second wound battery cell portion JRp2.

[0152] Here, the mirror-symmetrical movement toward each other means that the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 have the same vertical distance and moving speed relative to the center plane cp except for the opposite movement directions. In this way, the second wound battery cell portion JRp2 can be subjected to a more uniform extrusion force on both sides along the first direction z, effectively improving the molding effect of the second wound battery cell portion JRp2.

[0153] refer to Fig.10 (a) and (b), in some embodiments, the second extrusion group eg2 is configured not to contact the second wound cell part JRp2 when the battery cell expansion mechanism 30 is detached from the wound battery cell JR and before it is detached from the wound battery cell JR, so that the second wound battery cell part JRp2 remains suspended.

[0154] In this embodiment, when the battery cell expansion mechanism 30 is detached from the wound battery cell JR and before it is detached from the wound battery cell JR, the second wound battery cell portion JRp2 is kept suspended. In this way, when the second wound battery cell portion JRp2 is squeezed, the corner area will not be in an upward convex state due to the support from the lower side, thereby reducing the possibility of inconsistent lengths of the upper and lower pole pieces in the upwardly protruding corner area, which is easy to wrinkle during extrusion and shaping.

[0155] Fig.11(a) and (b) are Fig.10 Schematic diagram of two modified examples of the second extrusion group in (c). Fig.11 (a) and (b), in some embodiments, the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 have extrusion planes parallel to each other and perpendicular to the first direction z, and at least one of the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 has an extrusion slope or an extrusion arc surface, and the spacing between the relative extrusion slopes or extrusion arc surfaces along the first direction z increases in the direction away from the first extrusion group eg1.

[0156] exist Fig.11 In (a) and (b), the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 both have extrusion planes, and their extrusion planes are parallel to each other and perpendicular to the first direction z, so that the first extrusion group eg1 can extrude the first wound battery core portion JRp1 more smoothly. At least one of the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 may have an extrusion slope, or as in Fig.11 (a) or Fig.11 Whether it is an extrusion bevel or an extrusion bevel, the spacing between the extrusion bevels or extrusion bevels relative to each other along the first direction z increases in the direction away from the first extrusion group eg1, and when the corner area is extruded, the extrusion force can be gradually applied from the inside to the outside to the circular arc corner, which can reduce the risk of wrinkling of the pole piece in the corner area and is conducive to improving the uniformity of the pole piece layer gap.

[0157] Fig.11 At least one of the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 in (a) has an extrusion arc surface, which is a convex arc surface. This extrusion arc surface can gradually extrude the corner arc outward when moving toward the second wound battery cell part JRp2, so as to form a stable and controllable pole sheet layer gap in the corner area. Fig.11 In (b), at least one of the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 may have an extrusion arc surface that is concave. This extrusion arc surface is closer to the arc shape of the corner area, which is conducive to applying uniform pressure to the corner area during extrusion.

[0158] Fig.12 This is a schematic diagram of the process of the cell extrusion mechanism of the cell forming device embodiment of the present disclosure separating from the wound cell that has been shaped. Fig.12In some embodiments, after the first wound cell portion JRp1 and the second wound cell portion JRp2 are squeezed, the time when the first squeeze group eg1 is separated from the first wound cell portion JRp1 is different from the time when the second squeeze group eg2 is separated from the second wound cell portion JRp2.

[0159] When the extruded wound cell JR is separated from the cell extrusion mechanism, adhesion may occur due to the pressure difference caused by the vacuum between the cell surface and the extrusion surface or the viscosity formed by the glue on the diaphragm, resulting in loosening of the pole piece or separator in the wound cell JR. In this embodiment, by making the time when the first extrusion group eg1 separates from the first wound cell part JRp1 different from the time when the second extrusion group eg2 separates from the second wound cell part JRp2, the second extrusion group eg2 can be used to hold and limit the second wound cell part JRp2 when the first extrusion group eg1 separates from the first wound cell part JRp1, or the first extrusion group eg1 can be used to hold and limit the first wound cell part JRp1 when the second extrusion group eg2 separates from the second wound cell part JRp2. In this way, different parts of the wound cell JR are separated from the cell extrusion mechanism at different times, reducing the risk of loosening of the pole piece or separator in the wound cell JR due to adhesion, which is beneficial to improving the quality of the finished cell.

[0160] refer to Fig.12 (a) and (b), in some embodiments, the first extrusion group eg1 is configured to detach from the first wound cell portion JRp1 and then extrude the first wound cell portion JRp1 when the second extrusion group eg2 extrude the second wound cell portion JRp2; the second extrusion group eg2 is configured to detach from the second wound cell portion JRp2 when the first extrusion group eg1 extrude the first wound cell portion JRp1 again.

[0161] exist Fig.12 In (a), the second extrusion group eg2 extrude the second wound cell part JRp2 so as to form limiting constraints at both ends of the upper and lower side pole pieces and the isolation piece of the first wound cell part JRp1, so that when the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 move in the direction away from the first wound cell part JRp1 respectively, they can more easily detach from the upper and lower surfaces of the first wound cell part JRp1, thereby reducing the risk of adhesion and loosening.

[0162] exist Fig.12In (b), the first extrusion group eg1 that has been separated from the first wound cell part JRp1 can return to press the first wound cell part JRp1 again, and then the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 are moved in the direction away from the second wound cell part JRp2, so that the second extrusion group eg2 can be more easily separated from the upper and lower surfaces of the second wound cell part JRp2. Fig.12 In (c), the entire wound battery cell JR is placed flat on each second extrusion section 21 on the lower side so as to be further moved to the subsequent process.

[0163] Fig.13 It is a flow chart of some embodiments of the battery cell forming method of the present disclosure. Referring to the embodiments of the battery cell forming device mentioned above, for the wound battery cell JR, the embodiments of the present disclosure provide a battery cell forming method of the battery cell forming device of the aforementioned embodiments, including step S11, step S12, step S13 and step S14. In step S11, the wound battery cell JR is stretched out along a reference plane rp perpendicular to the first direction z by the battery cell expansion mechanism 30, so that the wound battery cell JR is deformed in a direction parallel to the reference plane rp. In step S12, the first wound battery cell part JRp1 of the deformed wound battery cell JR is squeezed by the first extrusion group eg1. In step S13, the battery cell expansion mechanism 30 is separated from the wound battery cell JR while the first extrusion group eg1 is squeezing the first wound battery cell part JRp1. In step S14 , after the cell expansion mechanism 30 is separated from the wound cell JR, the second wound cell portion JRp2 is pressed by the second pressing group eg2 while the first pressing group eg1 is pressing the first wound cell portion JRp1 .

[0164] In this embodiment, the first extrusion group eg1 keeps squeezing the first wound cell part JRp1, so that the cell expansion mechanism 30 is separated from the wound cell JR, and then the second squeezing group eg2 is used to squeeze the second wound cell part JRp2. Since the first wound cell part JRp1 can maintain a relative position when being pressed, the force requirement for the cell expansion mechanism 30 to open the wound cell JR is reduced, so that the cell can be formed by one stretching, saving the time consumed by multiple stretching actions, and improving production efficiency. In addition, in this embodiment, the distance and force required for the cell expansion mechanism 30 to open the cell are lower, and deformation failure is less likely to occur, which is conducive to extending the service life of the cell expansion mechanism 30.

[0165] The first extrusion group eg1 is used to maintain the extrusion of the first wound battery cell part JRp1, so that the pole piece of the first wound battery cell part JRp1 has no space for sagging and deformation, and accordingly the second wound battery cell part JRp2 can maintain a uniform gap in the arc-shaped corner area. On this basis, since the gap in the corner area is better controlled, the gluing equipment used in the related art to stick tape in the positive corner area to control the gap can be omitted. This saves equipment costs on the one hand, and reduces the pole piece utilization area affected by the gluing on the other hand, which is beneficial to improve the pole piece utilization rate and battery capacity. In addition, in this embodiment, when removing the battery cell expansion mechanism 30, since the first wound battery cell part JRp1 has been constrained by the first extrusion group eg1, the inner ring pole piece or isolation piece of the second wound battery cell part JRp2 is not easily taken out with the removal of the battery cell expansion mechanism 30, which effectively eliminates the problem of poor needle extraction that is easy to occur in the related art.

[0166] In some embodiments, the step of extruding the second wound cell portion JRp2 by the second extrusion group eg2 in step S14 includes: taking the center plane cp of the first wound cell portion JRp1 extruded by the first extrusion group eg1 as a reference, extruding the second wound cell portion JRp2 by the opposite movement of the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2.

[0167] In this embodiment, the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 can move toward each other based on the center plane cp of the first wound battery cell portion JRp1 extruded into a flat shape to achieve the extrusion of the second wound battery cell portion JRp2. The extrusion force on both sides of the second wound battery cell portion JRp2 along the first direction z can be relatively uniform, which is beneficial to improving the molding effect of the second wound battery cell portion JRp2.

[0168] In some embodiments, the battery cell forming method further includes: making the first extrusion group eg1 and the second extrusion group eg2 separate from the first wound battery cell portion JRp1 and the second wound battery cell portion JRp2 at different times.

[0169] When the extruded wound cell JR is separated from the cell extrusion mechanism, adhesion may occur due to the pressure difference caused by the vacuum between the cell surface and the extrusion surface or the viscosity formed by the glue on the diaphragm, resulting in loosening of the pole piece or separator in the wound cell JR. In this embodiment, by making the time when the first extrusion group eg1 separates from the first wound cell part JRp1 different from the time when the second extrusion group eg2 separates from the second wound cell part JRp2, the second extrusion group eg2 can be used to hold and limit the second wound cell part JRp2 when the first extrusion group eg1 separates from the first wound cell part JRp1, or the first extrusion group eg1 can be used to hold and limit the first wound cell part JRp1 when the second extrusion group eg2 separates from the second wound cell part JRp2. In this way, different parts of the wound cell JR are separated from the cell extrusion mechanism at different times, reducing the risk of loosening of the pole piece or separator in the wound cell JR due to adhesion, which is beneficial to improving the quality of the finished cell.

[0170] In some embodiments, the steps of making the first extrusion group eg1 and the second extrusion group eg2 separate from the first wound cell part JRp1 and the second wound cell part JRp2 at different times respectively include: while the second extrusion group eg2 is extruding the second wound cell part JRp2, the first extrusion group eg1 is separated from the first wound cell part JRp1; then, the first wound cell part JRp1 is extruded by the first extrusion group eg1; while the first extrusion group eg1 is again extruding the first wound cell part JRp1, the second extrusion group eg2 is separated from the second wound cell part JRp2.

[0171] In this embodiment, the second extrusion group eg2 extrudes the second wound cell part JRp2 so as to form a limiting constraint effect at both ends of the upper and lower side pole pieces and the separator of the first wound cell part JRp1, so that when the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 move in the direction away from the first wound cell part JRp1, they can be more easily separated from the upper and lower surfaces of the first wound cell part JRp1, reducing the risk of adhesion and loosening. The first extrusion group eg1 that has been separated from the first wound cell part JRp1 can return to press the first wound cell part JRp1 again, and at this time, the first extrusion segment 11 and the second extrusion segment 21 in the second extrusion group eg2 are moved in the direction away from the second wound cell part JRp2, so that the second extrusion group eg2 can be more easily separated from the upper and lower surfaces of the second wound cell part JRp2.

[0172] Fig.14This is a schematic diagram of the process of the cell extrusion mechanism of the cell forming device embodiment of the present disclosure separating from the laminated cell. Fig.14 In some embodiments, the battery cell includes a stacked battery cell SC, a first portion of the first extruded segments 11 among the multiple first extruded segments 11 and a first portion of the second extruded segments 21 among the multiple second extruded segments 21 that are opposite to the first portion of the first extruded segments 11 along the first direction z form a first extrusion group eg1, a second portion of the first extruded segments 11 among the multiple first extruded segments 11 and a second portion of the second extruded segments 21 that are opposite to the second portion of the first extruded segments 11 along the first direction z form a second extrusion group eg2; the first extrusion group eg1 is configured to extrude the first stacked battery cell portion SCp1 of the stacked battery cell SC, and the second extrusion group eg2 is configured to extrude the second stacked battery cell portion SCp2 of the stacked battery cell SC, and after the first stacked battery cell portion SCp1 and the second stacked battery cell portion SCp2 are both extruded, the time when the first extruded group eg1 detaches from the first stacked battery cell portion SCp1 is different from the time when the second extruded group eg2 detaches from the second stacked battery cell portion SCp2.

[0173] Combination Figure 3 and Fig.14 The first extrusion segment 11 and the second extrusion segment 21 cooperate with each other to form a first extrusion group eg1 and a second extrusion group eg2, wherein the first extrusion group eg1 is used to extrude the first laminated cell part SCp1 of the laminated cell SC, and the second extrusion group eg2 is used to extrude the second laminated cell part SCp2 of the laminated cell SC.

[0174] Figure 3 The first extrusion group eg1 indicated by the double-dotted line includes the first extrusion section 11 and the second extrusion section 21 located at the upper and lower sides in the middle, and the second extrusion group eg2 indicated by the double-dotted line includes the first extrusion section 11 and the second extrusion section 21 located at both sides of the first extrusion group eg1. Fig.14 The first laminated battery core portion SCp1 may be a middle region of the laminated battery core SC, and the second laminated battery core portion SCp2 may be a side region of the laminated battery core SC.

[0175] When the laminated battery cell SC is separated from the battery cell extrusion mechanism, adhesion may occur due to the pressure difference caused by the vacuum between the battery cell surface and the extrusion surface or the viscosity formed by the glue on the diaphragm, causing the pole pieces or separators in the laminated battery cell SC to loosen.

[0176] In this embodiment, by making the time when the first extrusion group eg1 detaches from the first stacked cell part SCp1 different from the time when the second extrusion group eg2 detaches from the second stacked cell part SCp2, the second stacked cell part SCp2 can be held and limited by the second extrusion group eg2 when the first extrusion group eg1 detaches from the first stacked cell part SCp1, or the first stacked cell part SCp1 can be held and limited by the first extrusion group eg1 when the second extrusion group eg2 detaches from the second stacked cell part SCp2. In this way, different parts of the stacked cell SC and the cell extrusion mechanism detach at different times, reducing the risk of loosening of the pole piece or isolation member in the stacked cell SC due to adhesion, thereby causing the pole piece layer gap to exceed the specification, which is beneficial to improving the quality of the finished cell.

[0177] refer to Fig.14 (e) and (f), in some embodiments, the battery cell forming device further includes a plurality of groups of jaws 40, and the plurality of groups of jaws 40 are configured to clamp the side portions of the stacked battery cell SC in at least two directions perpendicular to the first direction z; wherein the orthographic projection of the first stacked battery cell portion SCp1 on a reference plane rp perpendicular to the first direction z is located between the orthographic projections of the clamping positions of the plurality of groups of jaws 40 and the reference plane rp, and the second stacked battery cell portion SCp2 is located on the outside of the first stacked battery cell portion SCp1 in the at least two directions.

[0178] After completing the separation between the first extrusion group eg1 and the first stacked cell part SCp1, and the separation between the second extrusion group eg2 and the second stacked cell part SCp2, the side portions of the stacked cell SC can be clamped by multiple groups of clamps 40 so as to transfer the extruded stacked cell SC to subsequent processes.

[0179] Fig.15 Schematic diagram of the process flow of other embodiments of the battery core forming method disclosed in the present invention. Fig.14 and Fig.15 Based on the cell forming device of the above embodiment, for a laminated cell, the embodiment of the present disclosure provides a cell forming method of the above cell forming device, comprising step S21 and step S22. In step S21, a laminated cell SC is provided, and the first laminated cell part SCp1 and the second laminated cell part SCp2 of the laminated cell SC are respectively extruded by the first extrusion group eg1 and the second extrusion group eg2. In step S22, the first extrusion group eg1 and the second extrusion group eg2 are separated from the first laminated cell part SCp1 and the second laminated cell part SCp2 at different times.

[0180] In this embodiment, by making the time when the first extrusion group eg1 detaches from the first stacked cell part SCp1 different from the time when the second extrusion group eg2 detaches from the second stacked cell part SCp2, the second stacked cell part SCp2 can be held and limited by the second extrusion group eg2 when the first extrusion group eg1 detaches from the first stacked cell part SCp1, or the first stacked cell part SCp1 can be held and limited by the first extrusion group eg1 when the second extrusion group eg2 detaches from the second stacked cell part SCp2. In this way, different parts of the stacked cell SC and the cell extrusion mechanism detach at different times, reducing the risk of loosening of the pole piece or isolation member in the stacked cell SC due to adhesion, thereby causing the pole piece layer gap to exceed the specification, which is beneficial to improving the quality of the finished cell.

[0181] refer to Fig.14 (a)-(f), in some embodiments, the plurality of second extrusion segments 21 are located below the plurality of first extrusion segments 11, and the step of making the first extrusion group eg1 and the second extrusion group eg2 detach from the first stacked cell portion SCp1 and the second stacked cell portion SCp2 at different times in step S22 comprises: raising the first extrusion segment 11 located on the upper side of the first stacked cell portion SCp1 in the first extrusion group eg1 to detach from the first stacked cell portion SCp1; raising the second extrusion segment 21 located on the lower side of the first stacked cell portion SCp1 in the first extrusion group eg1 and the first extrusion segment 11 located on the upper side of the second stacked cell portion SCp2 in the second extrusion group eg2 to bring The stacked battery cell SC is moved to rise and detach from the second extrusion section 21 located at the lower side of the second stacked battery cell part SCp2 in the second extrusion group eg2; after the first stacked battery cell part SCp1 contacts the first extrusion section 11 located at the upper side of the first stacked battery cell part SCp1 in the first extrusion group eg1, the first extrusion section 11 located at the upper side of the second stacked battery cell part SCp2 in the second extrusion group eg2 continues to rise, so that the stacked battery cell SC is detached from the first extrusion section 11 located at the upper side of the second stacked battery cell part SCp2 in the second extrusion group eg2; the second stacked battery cell part SCp2 is clamped by multiple groups of jaws 40, and the first extrusion group eg1 is detached from the first stacked battery cell part SCp1.

[0182] like Fig.14As shown in (a), the first extrusion group eg1 and the second extrusion group eg2 hot-press or cold-press the stacked battery cell SC. At this time, the supporting surfaces of the second extrusion segments 21 located at the lower side of the stacked battery cell SC in the first extrusion group eg1 and the second extrusion group eg2 are located in the same plane, and the supporting surfaces of the first extrusion segments 11 located at the upper side of the stacked battery cell SC in the first extrusion group eg1 and the second extrusion group eg2 are located in the same plane.

[0183] like Fig.14 As shown in (b), the first extrusion section 11 located on the upper side of the first stacked cell part SCp1 in the first extrusion group eg1 is raised to separate from the first stacked cell part SCp1. At this time, the second extrusion group eg2 is pressed on the upper and lower sides of the second stacked cell part SCp2, and the possibility of loosening of the gap between the pole sheets due to adhesion between the top of the first stacked cell part SCp1 and the first extrusion section 11 is reduced through the limiting effect.

[0184] like Fig.14 As shown in (c), the second extrusion section 21 located at the lower side of the first stacked cell part SCp1 in the first extrusion group eg1 and the first extrusion section 11 located at the upper side of the second stacked cell part SCp2 in the second extrusion group eg2 are both raised, so as to drive the stacked cell SC to rise and separate from the second extrusion section 21 located at the lower side of the second stacked cell part SCp2 in the second extrusion group eg2. Since the second extrusion section 21 located at the lower side of the second stacked cell part SCp2 in the second extrusion group eg2 does not move upward with the second stacked cell part SCp2, it realizes the separation between the second stacked cell part SCp2 and the second extrusion section 21 below it.

[0185] After the first stacked cell portion SCp1 contacts the first extrusion segment 11 located on the upper side of the first stacked cell portion SCp1 in the first extrusion group eg1, Fig.14 As shown in (d), the first extrusion section 11 located on the upper side of the second laminated cell part SCp2 in the second extrusion group eg2 continues to rise, so that the laminated cell SC is separated from the first extrusion section 11 located on the upper side of the second laminated cell part SCp2 in the second extrusion group eg2. Since the second laminated cell part SCp2 does not move upward with the second extrusion section 21 located on the upper side in the second extrusion group eg2, it realizes the separation between the second laminated cell part SCp2 and the second extrusion section 21 on the upper side.

[0186] Since the first extrusion section 11 and the second extrusion section 21 located at the upper and lower sides of the second laminated cell portion SCp2 in the second extrusion group eg2 are both at a certain distance from the second laminated cell portion SCp2, such as Fig.14As shown in (e), the clamping claw 40 can clamp the second laminated cell portion SCp2 including the side portion.

[0187] like Fig.14 As shown in (f), when multiple groups of jaws 40 clamp the second stacked battery cell part SCp2, the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 are moved away from the first stacked battery cell part SCp1, so that the first extrusion group eg1 is separated from the first stacked battery cell part SCp1, so that the multiple groups of jaws 40 can move the stacked battery cells to the subsequent process.

[0188] In this embodiment, by lifting and lowering the first extrusion segment 11 and the second extrusion segment 21 in the first extrusion group eg1 and the second extrusion group eg2, different parts of the stacked battery cell SC are separated from the first extrusion segment 11 and the second extrusion segment 21 at different times, so that in the process of completing the separation of the stacked battery cell SC and the battery cell extrusion mechanism, the stacked battery cell SC is clamped by the clamp 40 and moved to the subsequent process, thereby improving the quality of the stacked battery cell SC and facilitating the connection with the subsequent process.

[0189] In this specification, multiple embodiments are described in a progressive manner, and the focus of each embodiment is different, and the same or similar parts between the embodiments can be referred to each other. For the method embodiment, since its overall and the contents involved correspond to the contents in the device embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the device embodiment.

[0190] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0191] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery core forming device, characterized in that: A battery cell squeezing mechanism for applying squeezing operation to the battery cell is included, and the battery cell squeezing mechanism includes: A first extrusion portion (10) comprises a plurality of first extrusion segments (11) which are respectively and independently movable, and is configured to enable the plurality of first extrusion segments (11) to move towards or away from the battery cell in a synchronous or asynchronous manner; and The second extrusion portion (20) is located on the opposite side of the first extrusion portion (10) along the first direction (z), and comprises a plurality of second extrusion segments (21) that can move independently and respectively, and is configured to enable the plurality of second extrusion segments (21) to move closer to or farther from the battery cell in a synchronous or asynchronous manner, Wherein, the first direction (z) is parallel to the extrusion direction of the battery cell extrusion mechanism; The plurality of first extrusion segments (11) can be divided into at least two groups of first extrusion segments (11) that move relatively independently, and / or the plurality of second extrusion segments (21) can be divided into at least two groups of second extrusion segments (21) that move relatively independently.

2. The battery core forming device according to claim 1, characterized in that: The plurality of first extrusion segments (11) are arranged at intervals along at least one direction perpendicular to the first direction (z); and / or the plurality of second extrusion segments (21) are arranged at intervals along at least one direction perpendicular to the first direction (z).

3. The battery core forming device according to claim 1, characterized in that: The number of the plurality of first extrusion segments (11) is the same as the number of the plurality of second extrusion segments (21); the plurality of first extrusion segments (11) correspond to the plurality of second extrusion segments (21) one by one and are respectively opposite to each other along the first direction (z).

4. The battery core forming device according to claim 1, characterized in that: The plurality of second extrusion sections (21) are located below the plurality of first extrusion sections (11); the second extrusion section (20) further comprises a transmission belt assembly (22); the transmission belt assembly (22) comprises a transmission wheel assembly (221) and a transmission belt (222); the transmission belt (222) is wound around the transmission wheel assembly (221) and the upper surfaces of the plurality of second extrusion sections (21) to support the battery cell.

5. The battery core forming device according to claim 4, characterized in that: The conveyor belt assembly (22) further comprises a belt tensioning mechanism (223), wherein the belt tensioning mechanism (223) comprises a buffer roller (2231) and a bracket (2232), wherein the buffer roller (2231) is movably arranged on the bracket (2232), and the conveyor belt (222) also passes around the buffer roller (2231), so that when at least part of the plurality of second extrusion segments (21) moves, the tension of the conveyor belt (222) can be adjusted by moving the buffer roller (2231) relative to the bracket (2232).

6. The battery core forming device according to any one of claims 1 to 5, characterized in that: The battery cell comprises a wound battery cell (JR), and the battery cell forming device further comprises a battery cell expansion mechanism (30), wherein the battery cell expansion mechanism (30) is configured to expand the wound battery cell (JR) along a reference plane (rp) perpendicular to the first direction (z), so that the wound battery cell (JR) is deformed in a direction parallel to the reference plane (rp); A first portion of the first extrusion segments (11) among the plurality of first extrusion segments (11) and a first portion of the second extrusion segments (21) that are opposite to the first portion of the first extrusion segments (11) along the first direction (z) among the plurality of second extrusion segments (21) form a first extrusion group (eg1), and a second portion of the first extrusion segments (11) among the plurality of first extrusion segments (11) and a second portion of the second extrusion segments (21) that are opposite to the second portion of the first extrusion segments (11) along the first direction (z) among the plurality of second extrusion segments (21) form a second extrusion group (eg2); The first extrusion group (eg1) is configured to extrude a first wound cell portion (JRp1) of a deformed wound cell (JR), and the second extrusion group (eg2) is configured to extrude a second wound cell portion (JRp2) of the deformed wound cell (JR).

7. The battery core forming device according to claim 6, characterized in that: The battery cell expansion mechanism (30) comprises a first clamping assembly (31) and a second clamping assembly (32) arranged at intervals along a second direction (x), the first clamping assembly (31) and the second clamping assembly (32) being respectively configured to clamp the wound battery cell (JR) and move in opposite directions on the reference plane (rp) in a direction parallel to the second direction (x) so as to expand the wound battery cell (JR) along the reference plane (rp); The orthographic projection of the first wound cell portion (JRp1) on the reference plane (rp) is located between the orthographic projections of the first clamping component (31) and the second clamping component (32) on the reference plane (rp), and the second wound cell portion (JRp2) is located on both sides of the first wound cell portion (JRp1) along the second direction (x).

8. The battery core forming device according to claim 7, characterized in that: The first clamping assembly (31) comprises a first outer clamping needle (311) and a first inner clamping needle (312) arranged at intervals along the second direction (x); the second clamping assembly (32) comprises a second outer clamping needle (321) and a second inner clamping needle (322) arranged at intervals along the second direction (x); the first inner clamping needle (312) and the second inner clamping needle (322) are located between the first outer clamping needle (311) and the second outer clamping needle (321); one of the first inner clamping needle (312) and the second inner clamping needle (322) is a fixed clamping needle, and the other is a rollable clamping needle.

9. The battery core forming device according to claim 6, characterized in that: The cell expansion mechanism (30) is configured to detach from the wound cell (JR) while the first extrusion group (eg1) is extruding the first wound cell part (JRp1), and the second extrusion group (eg2) is configured to, after the cell expansion mechanism (30) detaches from the wound cell (JR), extrude the second wound cell part (JRp2) while the first extrusion group (eg1) is extruding the first wound cell part (JRp1).

10. The battery core forming device according to claim 9, characterized in that: The second extrusion group (eg2) is configured to extrude the second wound cell portion (JRp2) by moving the first extrusion segment (11) and the second extrusion segment (21) in the second extrusion group (eg2) toward each other, with the center plane (cp) of the first wound cell portion (JRp1) extruded by the first extrusion group (eg1) as a reference.

11. The battery core forming device according to claim 10, characterized in that: The first extrusion segment (11) and the second extrusion segment (21) in the second extrusion group (eg2) are configured to move toward each other in a mirror-symmetrical manner relative to the center plane (cp) of the first wound battery cell portion (JRp1) to achieve extrusion of the second wound battery cell portion (JRp2).

12. The battery core forming device according to claim 9, characterized in that: The second extrusion group (eg2) is configured not to contact the second wound cell portion (JRp2) when the cell expansion mechanism (30) is detached from the wound cell (JR) and before the cell expansion mechanism (30) is detached from the wound cell (JR), so that the second wound cell portion (JRp2) remains suspended.

13. The battery core forming device according to claim 6, characterized in that: After the first wound cell portion (JRp1) and the second wound cell portion (JRp2) are both squeezed, the time when the first squeezed group (eg1) is separated from the first wound cell portion (JRp1) is different from the time when the second squeezed group (eg2) is separated from the second wound cell portion (JRp2).

14. The battery core forming device according to claim 13, characterized in that: The first extrusion group (eg1) is configured to separate from the first wound cell part (JRp1) and then extrude the first wound cell part (JRp1) when the second extrusion group (eg2) extrude the second wound cell part (JRp2); the second extrusion group (eg2) is configured to separate from the second wound cell part (JRp2) when the first extrusion group (eg1) extrude the first wound cell part (JRp1) again.

15. The battery core forming device according to claim 6, characterized in that: The first extrusion section (11) and the second extrusion section (21) in the first extrusion group (eg1) have extrusion planes that are parallel to each other and perpendicular to the first direction (z), and at least one of the first extrusion section (11) and the second extrusion section (21) in the second extrusion group (eg2) has an extrusion slope or an extrusion arc surface, and the spacing between the extrusion slopes or extrusion arc surfaces relative to each other along the first direction (z) increases in a direction away from the first extrusion group (eg1).

16. The battery core forming device according to any one of claims 1 to 5, characterized in that: The battery cell comprises a laminated battery cell (SC), wherein a first portion of the first extruded segments (11) among the plurality of first extruded segments (11) and a first portion of the second extruded segments (21) among the plurality of second extruded segments (21) opposite to the first portion of the first extruded segments (11) along the first direction (z) form a first extruded group (eg1), and a second portion of the first extruded segments (11) among the plurality of first extruded segments (11) and a second portion of the second extruded segments (21) opposite to the second portion of the first extruded segments (11) along the first direction (z) form a second extruded group (eg2); The first extrusion group (eg1) is configured to extrude the first stacked cell portion (SCp1) of the stacked cell (SC), and the second extrusion group (eg2) is configured to extrude the second stacked cell portion (SCp2) of the stacked cell (SC). After the first stacked cell portion (SCp1) and the second stacked cell portion (SCp2) are both squeezed, the time when the first extrusion group (eg1) detaches from the first stacked cell portion (SCp1) is different from the time when the second extrusion group (eg2) detaches from the second stacked cell portion (SCp2).

17. The battery core forming device according to claim 16, characterized in that: Also includes: A plurality of groups of clamping claws (40) configured to clamp the side edges of the laminated battery core (SC) in at least two directions perpendicular to the first direction (z); The orthographic projection of the first stacked cell portion (SCp1) on a reference plane (rp) perpendicular to the first direction (z) is located between the clamping positions of the multiple groups of clamps (40) on the orthographic projections of the reference plane (rp), and the second stacked cell portion (SCp2) is located outside the first stacked cell portion (SCp1) in at least two directions.

18. A battery cell forming method, applied to the battery cell forming device according to claim 6, characterized in that: The battery core forming method comprises: The wound battery cell (JR) is stretched out along a reference plane (rp) perpendicular to the first direction (z) by means of the battery cell expansion mechanism (30), so that the wound battery cell (JR) is deformed in a direction parallel to the reference plane (rp); Extruding a first wound cell portion (JRp1) of the deformed wound cell (JR) by means of the first extrusion group (eg1); When the first extrusion group (eg1) is extruding the first wound battery core portion (JRp1), the battery core expansion mechanism (30) is separated from the wound battery core (JR); After the cell expansion mechanism (30) is separated from the wound cell (JR), the second wound cell part (JRp2) is squeezed by the second squeezing group (eg2) while the first squeezing group (eg1) is squeezing the first wound cell part (JRp1).

19. The battery core forming method according to claim 18, characterized in that: The step of extruding the second wound cell portion (JRp2) by the second extrusion group (eg2) comprises: The second wound cell portion (JRp2) is extruded by the first extrusion group (eg2) through the relative movement of the first extrusion segment (11) and the second extrusion segment (21) in the second extrusion group (eg2) with the center plane (cp) of the first wound cell portion (JRp1) extruded by the first extrusion group (eg1) as a reference.

20. The battery core forming method according to claim 18, characterized in that: Also includes: The first pressing group (eg1) and the second pressing group (eg2) are separated from the first wound cell portion (JRp1) and the second wound cell portion (JRp2) at different times.

21. The battery core forming method according to claim 20, characterized in that: The step of causing the first extrusion group (eg1) and the second extrusion group (eg2) to be separated from the first wound cell portion (JRp1) and the second wound cell portion (JRp2) at different times comprises: While the second pressing group (eg2) is pressing the second wound cell portion (JRp2), the first pressing group (eg1) is separated from the first wound cell portion (JRp1); Then, the first wound battery core portion (JRp1) is extruded by the first extrusion group (eg1); While the first pressing group (eg1) is pressing the first wound cell portion (JRp1), the second pressing group (eg2) is separated from the second wound cell portion (JRp2).

22. A battery cell forming method, applied to the battery cell forming device according to claim 16, characterized in that: The battery core forming method comprises: Providing a laminated battery core (SC), and respectively extruding a first laminated battery core portion (SCp1) and a second laminated battery core portion (SCp2) of the laminated battery core (SC) by using the first extrusion group (eg1) and the second extrusion group (eg2); The first pressing group (eg1) and the second pressing group (eg2) are respectively separated from the first stacked cell portion (SCp1) and the second stacked cell portion (SCp2) at different times.

23. The battery core forming method according to claim 22, characterized in that: The plurality of second extrusion sections (21) are located below the plurality of first extrusion sections (11), and the steps of causing the first extrusion group (eg1) and the second extrusion group (eg2) to detach from the first stacked cell portion (SCp1) and the second stacked cell portion (SCp2) at different times respectively include: Raising the first extrusion section (11) located on the upper side of the first stacked cell portion (SCp1) in the first extrusion group (eg1) to separate from the first stacked cell portion (SCp1); The second extrusion section (21) located at the lower side of the first stacked battery core portion (SCp1) in the first extrusion group (eg1) and the first extrusion section (11) located at the upper side of the second stacked battery core portion (SCp2) in the second extrusion group (eg2) are both raised, so as to drive the stacked battery core (SC) to rise and separate from the second extrusion section (21) located at the lower side of the second stacked battery core portion (SCp2) in the second extrusion group (eg2); After the first laminated cell portion (SCp1) contacts the first extrusion section (11) located on the upper side of the first laminated cell portion (SCp1) in the first extrusion group (eg1), the first extrusion section (11) located on the upper side of the second laminated cell portion (SCp2) in the second extrusion group (eg2) continues to rise, so that the laminated cell (SC) is separated from the first extrusion section (11) located on the upper side of the second laminated cell portion (SCp2) in the second extrusion group (eg2); The second laminated battery core portion (SCp2) is clamped by a plurality of groups of clamping jaws (40), and the first extrusion group (eg1) is separated from the first laminated battery core portion (SCp1).

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