Battery pole piece forming device and forming method

Abstract

The present invention discloses a battery pole piece forming device and a forming method, belonging to the technical field of battery pole piece production equipment, the battery pole piece forming device comprises a conveying mechanism, a feeding mechanism and a rolling mechanism for conveying a substrate, the rolling mechanism comprises a first pressing roller, a second pressing roller, a third pressing roller and a fourth pressing roller arranged side by side in sequence, the spacing between the first pressing roller and the second pressing roller is the same as the spacing between the third pressing roller and the fourth pressing roller, the substrate is vertically arranged between the two second pressing rollers and the third pressing roller, the first pressing roller and the second pressing roller can roll the active material particles conveyed by the feeding mechanism to form a first diaphragm, the third pressing roller and the fourth pressing roller can roll the active material particles conveyed by the feeding mechanism to form a second diaphragm, and the second pressing roller and the third pressing roller can roll the first diaphragm and the second diaphragm on both sides of the substrate respectively. Compared with the prior art, the thickness of the formed battery pole piece can be made uniform, and the safety performance of the lithium-ion battery can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pole piece production equipment, and in particular to a battery pole piece forming equipment and a forming method. Background Art

[0002] Lithium-ion batteries have high energy density and have been used in fields such as mobile phones and notebook computers. However, as their uses expand and develop, further performance improvements such as lower resistance and higher capacity are required.

[0003] Lithium-ion battery electrodes can be obtained in the form of battery pole sheets. For example, in order to manufacture rolled sheets such as battery pole sheets from powders containing electrode active materials, powder compression molding using a powder calendering device has been carried out. In the powder calendering device, the powder is compressed and molded by a pressurizing roller on both sides of the substrate to obtain a battery pole sheet. However, the substrate is prone to shaking during the transmission process, resulting in different thicknesses of the powder on both sides of the substrate. This makes it easy for the powder to fall off the substrate due to different expansion conditions in different areas of the battery pole sheet during the later working process, affecting the normal operation of the subsequent lithium-ion battery. Summary of the invention

[0004] The purpose of the present invention is to provide a battery pole piece forming device and a forming method to solve the problem in the prior art that the thickness of the powder on both sides of the substrate of the battery pole piece is different, which affects the normal operation of the subsequent lithium-ion battery.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A battery pole piece forming device comprises a conveying mechanism, a feeding mechanism and a rolling mechanism for conveying a substrate, the rolling mechanism comprises a first pressing roller, a second pressing roller, a third pressing roller and a fourth pressing roller arranged side by side in sequence, the spacing between the first pressing roller and the second pressing roller is the same as the spacing between the third pressing roller and the fourth pressing roller, the substrate is vertically arranged between the second pressing roller and the third pressing roller, the first pressing roller and the second pressing roller can roll the active material particles conveyed by the feeding mechanism to form a first diaphragm, the third pressing roller and the fourth pressing roller can roll the active material particles conveyed by the feeding mechanism to form a second diaphragm, and the second pressing roller and the third pressing roller can roll the first diaphragm and the second diaphragm on both sides of the substrate respectively.

[0007] Further, the temperature of the first pressing roller is greater than the temperature of the second pressing roller, and the temperature of the fourth pressing roller is greater than the temperature of the third pressing roller.

[0008] Furthermore, the battery pole piece forming equipment also includes a first driving mechanism and a first mounting assembly, the first pressing roller and the second pressing roller are both mounted on the first mounting assembly, and the first driving mechanism can drive the first pressing roller and / or the second pressing roller to move the first pressing roller and the second pressing roller closer to or farther away from each other.

[0009] Furthermore, the first mounting assembly includes two oppositely arranged first mounting structures and two oppositely arranged second mounting structures, the first pressure roller is installed between the two first mounting structures, and the second pressure roller is installed between the two second mounting structures; the first driving mechanism includes two first driving structures, and the two first driving structures can respectively drive the two first mounting structures to move toward or away from the third pressure roller.

[0010] Furthermore, the battery pole piece forming equipment also includes a second driving mechanism and a second mounting assembly, the third pressing roller and the fourth pressing roller are both mounted on the second mounting assembly, and the second driving mechanism can drive the second mounting assembly to move toward or away from the second pressing roller.

[0011] Further, the second mounting assembly includes two relatively arranged supporting structures, two relatively arranged third mounting structures and two relatively arranged fourth mounting structures, each of the supporting structures is correspondingly provided with a third mounting structure and a fourth mounting structure, one of the third pressure roller and the fourth pressure roller is installed between the two third mounting structures, and the other is installed between the two fourth mounting structures, the fourth mounting structure and / or the third mounting structure can be slidably arranged on the corresponding supporting structure, and the supporting structure is connected to the second driving mechanism.

[0012] Furthermore, the battery pole piece forming equipment also includes a third driving mechanism, which is configured to drive the corresponding fourth mounting structure and / or the third mounting structure to move the third pressing roller and the fourth pressing roller closer to or farther away from each other.

[0013] Furthermore, the third driving mechanism includes two third driving structures, and each of the third driving structures can drive the corresponding fourth mounting structure to move towards or away from the third mounting structure.

[0014] Further, the third driving structure includes a driving member, a pushing block and a first elastic member, the driving member can drive the pushing block to move in a vertical direction, the first elastic member is arranged between the corresponding third mounting structure and the fourth mounting structure, and when the driving member drives the pushing block to move downward, the pushing block can push the fourth mounting structure to move in a direction close to the corresponding third mounting structure.

[0015] Furthermore, the third driving structure also includes a second elastic member, and the second elastic member is arranged between the pushing block and the supporting structure.

[0016] Furthermore, the feeding mechanism includes at least two feeding hoppers, wherein a feeding port of one of the feeding hoppers is located above the gap between the first pressing roller and the second pressing roller, and a feeding port of the other feeding hopper is located above the gap between the third pressing roller and the fourth pressing roller.

[0017] Furthermore, the conveying mechanism includes a first support member and a second support member, the first support member can support the substrate coil, the second support member is provided with a winding roller, and the winding roller can drive the substrate to vertically pass between the second pressure roller and the third pressure roller.

[0018] To achieve the above object, the present invention further provides a battery pole piece forming method, which is applicable to the battery pole piece forming equipment in any of the above schemes, and the battery pole piece forming method comprises the following steps:

[0019] S1, rolling the active material particles simultaneously to form a first membrane sheet and a second membrane sheet;

[0020] S2: rolling the first film and the second film onto two sides of the substrate respectively.

[0021] The beneficial effects of the present invention are:

[0022] The battery pole piece forming equipment and forming method proposed in the present invention are as follows: the battery pole piece forming equipment is provided with a first pressing roller, a second pressing roller, a third pressing roller and a fourth pressing roller, the spacing between the first pressing roller and the second pressing roller is the same as the spacing between the third pressing roller and the fourth pressing roller, the first pressing roller and the second pressing roller press active material particles to form a first membrane sheet, the third pressing roller and the fourth pressing roller press active material particles to form a second membrane sheet, and then the first membrane sheet and the second membrane sheet are respectively pressed onto both sides of a substrate by the second pressing roller and the third pressing roller. Compared with the prior art, the thickness of the first membrane sheet and the second membrane sheet on both sides of the substrate can be ensured to be consistent, thereby ensuring that the thickness of the formed battery pole piece is uniform, avoiding the situation in which the active material falls off and causes a short circuit during the subsequent operation of the lithium ion battery, and improving the safety performance of the lithium ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the pole piece forming equipment provided by the present invention;

[0024] Figure 2 is a cross-sectional schematic diagram of a pole piece forming device provided by the present invention;

[0025] Figure 3It is a front view of the pole piece forming equipment provided by the present invention.

[0026] In the figure:

[0027] 1. Support frame; 11. Horizontal support plate; 111. Extension plate; 1111. Fourth slide groove; 12. Vertical support plate; 121. Third slide groove;

[0028] 2. Conveying mechanism; 21. First supporting member; 22. Second supporting member; 23. First supporting roller; 24. Second supporting roller; 25. Third supporting roller;

[0029] 3. Feeding mechanism; 31. Feeding hopper;

[0030] 4. Rolling mechanism; 41. First pressing roller; 42. Second pressing roller; 43. Third pressing roller; 44. Fourth pressing roller; 45. First gear; 46. Second gear; 47. Third gear; 48. Fourth gear;

[0031] 5. First mounting assembly; 51. First mounting structure; 52. Second mounting structure; 53. First fixing member;

[0032] 6. First driving structure; 61. First rotating wheel; 62. First connecting rod;

[0033] 7. Second mounting assembly; 71. Support structure; 711. First part; 712. Second part; 713. Third part; 72. Third mounting structure; 73. Fourth mounting structure; 74. Second fixing member;

[0034] 8. Second driving structure; 81. Second rotating wheel; 82. Second connecting rod;

[0035] 9. third driving structure; 91. third rotating wheel; 92. third connecting rod; 93. pushing block; 94. second elastic member;

[0036] 100. Base material. DETAILED DESCRIPTION

[0037] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figures 1 to 3 As shown, this embodiment provides a battery pole piece forming device, which includes a conveying mechanism 2 for conveying a substrate 100, a feeding mechanism 3 and a rolling mechanism 4, the rolling mechanism 4 includes a first pressing roller 41, a second pressing roller 42, a third pressing roller 43 and a fourth pressing roller 44 arranged side by side in sequence, the spacing between the first pressing roller 41 and the second pressing roller 42 is the same as the spacing between the third pressing roller 43 and the fourth pressing roller 44, the substrate 100 is vertically arranged between the second pressing roller 42 and the third pressing roller 43, the first pressing roller 41 and the second pressing roller 42 can roll the active material particles conveyed by the feeding mechanism 3 to form a first membrane, the third pressing roller 43 and the fourth pressing roller 44 can roll the active material particles conveyed by the feeding mechanism 3 to form a second membrane, and the second pressing roller 42 and the third pressing roller 43 can roll the first membrane and the second membrane on both sides of the substrate 100 respectively.

[0042] The first pressing roller 41 and the third pressing roller 43 rotate in opposite directions, and the second pressing roller 42 and the fourth pressing roller 44 rotate in opposite directions. The first film formed by rolling the first pressing roller 41 and the second pressing roller 42 is attached to the second pressing roller 42, and the second film formed by rolling the third pressing roller 43 and the fourth pressing roller 44 is attached to the third pressing roller 43. Then, the second pressing roller 42 and the third pressing roller 43 roll the first film and the second film on both sides of the substrate 100 respectively. In this way, the thickness of the first film and the second film located on both sides of the substrate 100 can be kept the same, so that the thickness of the formed battery pole piece is uniform, and the rolling of the active material particles to form a film and the rolling forming of the battery pole piece are carried out simultaneously, which can improve the forming efficiency of the battery pole piece.

[0043] Further, in order to make the first film sheet be better attached to the second pressing roller 42, the temperature of the first pressing roller 41 is greater than the temperature of the second pressing roller 42. In this embodiment, the temperature of the first pressing roller 41 is 40°C-300°C, and the temperature of the second pressing roller 42 is room temperature, so that the first film sheet can be better attached to the second pressing roller 42 after roll forming. In order to make the second film sheet be better attached to the third pressing roller 43, the temperature of the fourth pressing roller 44 is greater than the temperature of the third pressing roller 43, the temperature of the fourth pressing roller 44 is 40°C-300°C, and the temperature of the third pressing roller 43 is room temperature, so that the second film sheet 42 can be better attached to the third pressing roller 43 after roll forming.

[0044] Further, in this embodiment, the roughness of the first pressing roller 41 , the second pressing roller 42 , the third pressing roller 43 and the fourth pressing roller 44 are all 0.4 μm-0.8 μm.

[0045] like Figure 1 As shown, the feeding mechanism 3 includes at least two feeding hoppers 31, wherein the feeding port of one feeding hopper 31 is located above the gap between the first pressing roller 41 and the second pressing roller 42, and the feeding port of the other feeding hopper 31 is located above the gap between the third pressing roller 43 and the fourth pressing roller 44. Specifically, in this embodiment, the feeding mechanism 3 includes two feeding hoppers 31. It can be understood that the roller-pressing of the first diaphragm and the second diaphragm is carried out by the corresponding feeding hoppers 31 to convey the active material particles separately, so that when the feeding speeds of the two feeding hoppers 31 are the same, the uniformity of the conveying of the active material particles can be ensured, thereby further ensuring the consistency of the thickness of the first diaphragm and the second diaphragm. Of course, there can be more than two feeding hoppers 31.

[0046] Further, the conveying mechanism 2 includes a first support member 21 and a second support member 22, wherein the first support member 21 can support the substrate coil, and the second support member 22 is provided with a winding roller, which can drive the substrate 100 to pass between the second pressing roller 42 and the third pressing roller 43. The conveying mechanism 2 also includes two first support rollers 23 for supporting the substrate 100, and a portion of the substrate 100 located between the two first support rollers 23 is vertically arranged. It can be understood that under the action of the two first support rollers 23, the portion of the substrate 100 located between the two first support rollers 23 is vertically passed between the second pressing roller 42 and the third pressing roller 43, so that the second pressing roller 42 and the third pressing roller 43 respectively roll the first film and the second film on both sides of the substrate 100.

[0047] Further, the conveying mechanism 2 further includes a second support roller 24 and a third support roller 25, at least one second support roller 24 and at least one third support roller 25 are provided between the first support member 21 and the rolling mechanism 4, at least one second support roller 24 and at least one third support roller 25 are provided between the second support member 22 and the rolling mechanism 4, and the substrate 100 can be supported and tensioned by the second support roller 24 and the third support roller 25. Specifically, in the present embodiment, a second support roller 24 and two third support rollers 25 are provided between the first support member 21 and the rolling mechanism 4, and the second support roller 24 is located between the two third support rollers 25 and below the two third support rollers 25 in the vertical direction. A second support roller 24 and two third support rollers 25 are provided between the second support member 22 and the rolling mechanism 4, and the second support roller 24 is located between the two third support rollers 25 and below the two third support rollers 25 in the vertical direction. It can be understood that in the present embodiment, the substrate 100 is wound below the two second support rollers 24.

[0048] Further, in this embodiment, the positions of the second support rollers 24 in the vertical direction are adjustable. By setting the second support rollers 24 to be adjustable in the vertical direction, the substrate 100 can be tensioned by adjusting the positions of the two second support rollers 24 in the vertical direction. Of course, in other embodiments, the third support roller 25 can also be set to be adjustable in the vertical direction, and the substrate 100 can be tensioned by adjusting the position of the third support roller 25.

[0049] Specifically, Figure 1 and Figure 2 As shown, the pole piece forming device provided in this embodiment further includes a support frame 1. Specifically, the support frame 1 includes a horizontal support plate 11 and a vertical support plate 12, and the vertical support plate 12 is vertically connected to the horizontal support plate 11. The first support member 21, the second support member 22, the first support roller 23, the second support roller 24 and the third support roller 25 are all arranged on the vertical support plate 12.

[0050] In this embodiment, the vertical support plate 12 is respectively provided with linear guide rails extending in the vertical direction corresponding to the two second support rollers 24, and the second support rollers 24 are slidably arranged on the linear guide rails so as to be able to move in the vertical direction. In addition, in this embodiment, the position of the upper first support roller 23 of the two first support rollers 23 is adjustable in the horizontal direction, and the position of the lower first support roller 23 is adjustable in the vertical direction, thereby avoiding interference between the substrate 100 and the first pressure roller 41 by adjusting the position of the lower first support roller 23 in the vertical direction, and the verticality of the part of the substrate 100 located between the two first support rollers 23 can be adjusted by adjusting the position of the upper first support roller 23 in the horizontal direction. Specifically, a third slide groove 121 is provided in the horizontal direction on the vertical support plate 12, and the upper first support roller 23 of the two first support rollers 23 is slidably arranged in the third slide groove 121. The horizontal support plate 11 is provided with an extension plate 111 extending in the vertical direction, and the extension plate 111 is provided with a fourth slide groove 1111 extending in the vertical direction, and the lower one of the two first support rollers 23 is slidably disposed in the fourth slide groove 1111. Figure 2 The ab direction in the vertical direction is Figure 2 cd direction in .

[0051] like Figures 1 to 3 As shown, the battery pole piece forming equipment also includes a first driving mechanism and a first mounting assembly 5, the first pressing roller 41 and the second pressing roller 42 are both mounted on the first mounting assembly 5, and the first driving mechanism can drive the first pressing roller 41 to move toward or away from the second pressing roller 42.

[0052] Specifically, in this embodiment, the first mounting assembly 5 includes two first mounting structures 51 and two second mounting structures 52, the first pressing roller 41 can be rotatably mounted between the two first mounting structures 51, and the second pressing roller 42 can be rotatably mounted between the two second mounting structures 52. Further, each second mounting structure 52 is provided with a first slide groove, each first mounting structure 51 can be slidably disposed in a corresponding first slide groove, and the first driving mechanism can push the first mounting structure 51 to slide along the corresponding first slide groove, thereby driving the first pressing roller 41 to approach or move away from the second pressing roller 42.

[0053] Furthermore, the first mounting assembly 5 also includes two first fixing members 53, and the two first fixing members 53 are respectively connected to the two second mounting structures 52. The above-mentioned first driving mechanism includes two first driving structures 6, and the two first driving structures 6 are respectively used to drive the two first mounting structures 51 to slide. Specifically, the first driving structure 6 includes a first rotating wheel 61 and a first connecting rod 62 connected to each other, and the first connecting rod 62 passes through the corresponding first fixing member 53 and is connected to the first mounting structure 51, and the first connecting rod 62 is threadedly connected to the first fixing member 53. By rotating the first rotating wheel 61, the corresponding first mounting structure 51 can be driven to slide along the corresponding first sliding groove, thereby realizing the adjustment of the distance between the first pressure roller 41 and the second pressure roller 42.

[0054] Further, in the present embodiment, the second mounting structure 52 and the first fixing member 53 are both mounted on the horizontal support plate 11. In addition, in the present embodiment, the first mounting structure 51 includes a first mounting block, and further preferably, the first mounting structure 51 includes a first mounting block, and the first pressure roller 41 is mounted between the two first mounting blocks. Of course, in other embodiments, the first mounting structure 51 may also include a plurality of first mounting blocks. In addition, in the present embodiment, the second mounting structure 52 includes a second mounting block, and further preferably, the second mounting structure 52 includes a second mounting block, and the second pressure roller 42 is mounted between the two second mounting blocks. Of course, in other embodiments, the second mounting structure 52 may also include a plurality of second mounting blocks.

[0055] Of course, in other embodiments, the first drive mechanism may also drive the second pressure roller 42 to move in a direction close to or away from the first pressure roller 41. Specifically, the first mounting assembly 5 includes two relatively arranged fifth mounting structures and two relatively arranged sixth mounting structures, wherein the first pressure roller 41 is installed between the two fifth mounting structures, and the second pressure roller 42 is installed between the two sixth mounting structures. The above-mentioned first drive mechanism includes two fourth drive mechanisms, and the two fourth drive structures can respectively drive the two sixth mounting structures to move in a direction close to or away from the corresponding fifth mounting structure. The fourth drive mechanism can be a structure such as a cylinder, a motor screw, etc., which can realize the drive of the sixth mounting structure, and this embodiment does not make specific restrictions. Of course, it can also be that the first drive structure can drive the first pressure roller 41 and the second pressure roller 42 to move simultaneously, so that the first pressure roller 41 and the second pressure roller 42 are close to or away from each other. The specific structure of the first drive structure is not specifically limited in this embodiment, as long as it can realize the simultaneous driving of the first pressure roller 41 and the second pressure roller 42 to move simultaneously.

[0056] like Figures 1 to 3As shown, the battery pole piece forming equipment also includes a second driving mechanism and a second mounting assembly 7 slidably arranged on the horizontal support plate 11, the third pressing roller 43 and the fourth pressing roller 44 are both mounted on the second mounting assembly 7, and the second driving mechanism can drive the second mounting assembly 7 to move in a direction close to or away from the second pressing roller 42. Specifically, in this embodiment, the second mounting assembly 7 includes two supporting structures 71 arranged opposite to each other, and the third pressing roller 43 and the fourth pressing roller 44 are both mounted between the two supporting structures 71. The second mounting assembly 7 also includes two second fixing members 74, and the two second fixing members 74 correspond to the two supporting structures 71 respectively. The two second fixing members 74 are both fixedly arranged on the horizontal support plate 11, and the two supporting structures 71 can be slidably arranged on the horizontal support plate 11. Further, in order to enable the support structure 71 to slide stably, a limiting groove is provided on the horizontal support plate 11 corresponding to each supporting structure 71, and the support structure 71 is slidably arranged in the corresponding limiting groove. Further preferably, in order to reduce the friction between the support structure 71 and the horizontal support plate 11, a roller is provided on the support structure 71. By providing rollers, the sliding of the support structure 71 relative to the horizontal support plate 11 is changed into rolling, so that the friction between the support structure 71 and the horizontal support plate 11 can be reduced.

[0057] The second driving mechanism includes two second driving structures 8, and the two second driving structures 8 are respectively used to drive the two supporting structures 71 to move. Specifically, the second driving structure 8 includes a second rotating wheel 81 and a second connecting rod 82 connected to each other, and the second connecting rod 82 passes through the corresponding second fixing member 74 and is connected to the corresponding supporting structure 71, and the second connecting rod 82 is threadedly connected to the second fixing member 74. The corresponding supporting structure 71 can be driven to move by rotating the second rotating wheel 81, so that the two supporting structures 71 can be driven to move by the two second driving structures 8, thereby driving the second mounting assembly 7 to move as a whole, and adjusting the distance between the second pressure roller 42 and the third pressure roller 43.

[0058] Furthermore, in this embodiment, the second mounting assembly 7 also includes two relatively arranged third mounting structures 72 and two relatively arranged fourth mounting structures 73, the third pressure roller 43 is installed between the two third mounting structures 72, the fourth pressure roller 44 is installed between the two fourth mounting structures 73, and each supporting structure 71 is provided with a third mounting structure 72 and a fourth mounting structure 73, wherein the third mounting structure 72 is fixedly arranged on the corresponding supporting structure 71, and the fourth mounting structure 73 can be slidably arranged on the corresponding supporting structure 71.

[0059] Specifically, the support structure 71 has a second slide groove, and the fourth mounting structure 73 can be slidably arranged in the second slide groove. The battery pole piece forming device also includes a third driving mechanism, which includes two third driving structures 9, and the two third driving structures 9 are respectively used to drive the two fourth mounting structures 73 to slide along the corresponding second slide groove and move in the direction close to or away from the third mounting structure 72. Specifically, the third driving structure 9 includes a driving member, a pushing block 93 and a first elastic member, and the driving member can drive the pushing block 93 to move in the vertical direction. Specifically, the driving member includes a third rotating wheel 91 and a third connecting rod 92. Among them, the third rotating wheel 91 is connected to the third connecting rod 92, and the third connecting rod 92 is vertically arranged. One end of the third connecting rod 92 passes through the support structure 71 and is connected to the pushing block 93. The third connecting rod 92 is threadedly connected to the support structure 71, and the other end is provided with a third rotating wheel 91, and the pushing block 93 is located in the second slide groove. The first elastic member is arranged between the third mounting structure 72 and the fourth mounting structure 73. Furthermore, a first inclined surface is provided on the push block 93, and a second inclined surface abutting against the first inclined surface is provided on the fourth mounting structure 73. When the third rotating wheel 91 is rotated so that the third connecting rod 92 pushes the push block 93 to move downward, the push block 93 slides downward along the second inclined surface, and at the same time pushes the fourth mounting structure 73 to move in a direction close to the third mounting structure 72, so that the distance between the third pressing roller 43 and the fourth pressing roller 44 is reduced. In this process, the first elastic member is compressed, and when the third rotating wheel 91 is rotated so that the third connecting rod 92 drives the push block 93 to move upward, the push block 93 slides upward along the second inclined surface, and under the elastic force of the first elastic member to return to its original state, the fourth mounting structure 73 is pushed to move in a direction away from the third mounting structure 72, so that the distance between the third pressing roller 43 and the fourth pressing roller 44 is increased.

[0060] Specifically, in the present embodiment, the third mounting structure 72 includes a third mounting block, and further preferably, the third mounting structure 72 includes one third mounting block, and the third pressure roller 43 is installed between two third mounting blocks. Of course, in other embodiments, the third mounting structure 72 may also include a plurality of third mounting blocks. In addition, in the present embodiment, the fourth mounting structure 73 includes a fourth mounting block, and further preferably, the fourth mounting structure 73 includes one fourth mounting block, and the fourth pressure roller 44 is installed between two fourth mounting blocks. Of course, in other embodiments, the fourth mounting structure 73 may also include a plurality of fourth mounting blocks.

[0061] Of course, in other embodiments, the third roller 43 may be installed between two fourth mounting structures 73, and the fourth roller 44 may be installed between two third mounting structures 72. In this case, the third driving mechanism includes two third driving structures 9, and each third driving structure 9 can drive the third roller 43 to move toward or away from the fourth roller 44. Alternatively, the third mounting structure 72 is slidably arranged on the corresponding support structure 71, and the fourth mounting structure 73 is fixedly arranged on the corresponding support structure 71. The third driving mechanism includes two third driving structures 9, and each third driving structure 9 can drive the corresponding third mounting structure 72 to move toward or away from the fourth mounting structure 73. Alternatively, both the third mounting structure 72 and the fourth mounting structure 73 can be slidably arranged on the corresponding support structure 71. It can be understood that in this case, the third driving mechanism includes four third driving structures 9, and each third mounting structure 72 corresponds to one third driving structure 9, and each fourth mounting structure 73 corresponds to one third driving structure 9.

[0062] Furthermore, the third driving structure 9 further includes a second elastic member 94, which is disposed between the pushing block 93 and the supporting structure 71. By providing the second elastic member 94, the movement of the pushing block 93 can be buffered, and support can be provided for the pushing block 93, so that the position of the pushing block 93 remains stable when the third rotating wheel 91 stops rotating, thereby maintaining a stable spacing between the third pressing roller 43 and the fourth pressing roller 44.

[0063] like Figure 1-3 As shown, in this embodiment, the support structure 71 includes a first portion 711, a second portion 712 and a third portion 713, the second portion 712 is vertically connected to the first portion 711, the third portion 713 is vertically connected to the second portion 712, and the above-mentioned second slide groove is formed between the first portion 711, the second portion 712 and the third portion 713. The first portion 711 is located in the limiting groove, and a roller is provided on the first portion 711. The second connecting rod 82 is threadedly connected to the second portion 712, and one side of the pushing block 93 abuts against the second portion 712. The third connecting rod 92 passes through the third portion 713 and is connected to the pushing block 93, and the third connecting rod 92 is threadedly connected to the third portion 713.

[0064] like Figure 1 As shown, in order to improve the rotation consistency of the first pressure roller 41, the second pressure roller 42, the third pressure roller 43 and the fourth pressure roller 44, one end of the first pressure roller 41 is connected to the first gear 45, one end of the second pressure roller 42 is connected to the second gear 46, one end of the third pressure roller 43 is connected to the third gear 47, and one end of the fourth pressure roller 44 is connected to the fourth gear 48, wherein the first gear 45 and the second gear 46 are meshed, the second gear 46 and the third gear 47 are meshed, and the third gear 47 and the fourth gear 48 are meshed.

[0065] In summary, the battery pole piece forming equipment provided in this embodiment is provided with a first pressing roller 41, a second pressing roller 42, a third pressing roller 43 and a fourth pressing roller 44. The first pressing roller 41 and the second pressing roller 42 press the active material particles to form a first membrane sheet, and the third pressing roller 43 and the fourth pressing roller 44 press the active material particles to form a second membrane sheet. Subsequently, the first membrane sheet and the second membrane sheet are respectively pressed onto the two sides of the substrate 100 by the second pressing roller 42 and the third pressing roller 43. Compared with the prior art, the thickness of the first membrane sheet and the second membrane sheet respectively located on the two sides of the substrate 100 can be made consistent, thereby ensuring the uniform thickness of the formed battery pole piece, avoiding the occurrence of a short circuit caused by the falling of active materials during the subsequent lithium ion operation process, and improving the safety performance of lithium ion batteries.

[0066] This embodiment also provides a battery pole piece forming method, which includes the following steps:

[0067] S1: rolling the active material particles simultaneously to form a first film sheet and a second film sheet of the same thickness;

[0068] S2: rolling the first film and the second film onto the two sides of the substrate 100 respectively.

[0069] It can be understood that in this embodiment, the rolling of the active material and the forming of the battery pole piece are carried out in steps. First, the active material particles are rolled by the first pressing roller 41 and the second pressing roller 42 to form a first diaphragm, and then rolled by the third pressing roller 43 and the fourth pressing roller 44 to form a second diaphragm. The thickness of the first diaphragm and the second diaphragm are the same. Subsequently, the first diaphragm and the second diaphragm are rolled on both sides of the substrate 100 by the second pressing roller 42 and the third pressing roller 43 respectively, which can improve the consistency of the thickness of the first diaphragm and the second diaphragm, thereby ensuring that the thickness of the battery pole piece formed after the first diaphragm and the second diaphragm are rolled on the substrate 100 is uniform, avoiding the situation where the active material falls off and causes a short circuit during the subsequent operation of the lithium-ion battery, thereby improving the safety performance of the lithium-ion battery.

[0070] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery pole piece forming device, characterized in that: The invention comprises a conveying mechanism (2), a feeding mechanism (3) and a rolling mechanism (4) for conveying a substrate (100); the rolling mechanism (4) comprises a first pressing roller (41), a second pressing roller (42), a third pressing roller (43) and a fourth pressing roller (44) which are arranged in sequence side by side; the spacing between the first pressing roller (41) and the second pressing roller (42) is the same as the spacing between the third pressing roller (43) and the fourth pressing roller (44); the substrate (100) is vertically passed through the second pressing roller ( 42) and the third pressing roller (43), the first pressing roller (41) and the second pressing roller (42) are capable of rolling the active material particles transported by the feeding mechanism (3) to form a first membrane sheet, the third pressing roller (43) and the fourth pressing roller (44) are capable of rolling the active material particles transported by the feeding mechanism (3) to form a second membrane sheet, and the second pressing roller (42) and the third pressing roller (43) are capable of rolling the first membrane sheet and the second membrane sheet respectively onto two sides of the substrate (100); The conveying mechanism (2) comprises a first support member (21) and a second support member (22), the first support member (21) being capable of supporting a coiled substrate, the second support member (22) being provided with a winding roller, the winding roller being capable of driving the substrate (100) to pass vertically between the second pressing roller (42) and the third pressing roller (43); The temperature of the first pressing roller (41) is greater than the temperature of the second pressing roller (42), and the temperature of the fourth pressing roller (44) is greater than the temperature of the third pressing roller (43); The battery pole piece forming device further comprises a first driving mechanism and a first mounting assembly (5), the first pressing roller (41) and the second pressing roller (42) are both mounted on the first mounting assembly (5), and the first driving mechanism is capable of driving the first pressing roller (41) and / or the second pressing roller (42) to move the first pressing roller (41) and the second pressing roller (42) closer to or farther away from each other; The battery pole piece forming device further comprises a second driving mechanism and a second mounting assembly (7), the third pressing roller (43) and the fourth pressing roller (44) are both mounted on the second mounting assembly (7), and the second driving mechanism is capable of driving the second mounting assembly (7) to move in a direction approaching or away from the second pressing roller (42); The second mounting assembly (7) comprises two supporting structures (71) arranged opposite to each other, two third mounting structures (72) arranged opposite to each other and two fourth mounting structures (73) arranged opposite to each other, one of the third mounting structures (72) and one of the fourth mounting structures (73) being arranged on each of the supporting structures (71), one of the third pressing roller (43) and the fourth pressing roller (44) being mounted between the two third mounting structures (72), and the other being mounted between the two fourth mounting structures (73), the fourth mounting structure (73) and / or the third mounting structure (72) being slidably arranged on the corresponding supporting structure (71), and the supporting structure (71) being connected to the second driving mechanism; The battery pole piece forming equipment further comprises a third driving mechanism, wherein the third driving mechanism is configured to be capable of driving the corresponding fourth mounting structure (73) and / or the third mounting structure (72) so as to move the third pressing roller (43) and the fourth pressing roller (44) closer to or further away from each other.

2. The battery pole piece forming equipment according to claim 1, characterized in that: The first mounting assembly (5) comprises two first mounting structures (51) arranged opposite to each other and two second mounting structures (52) arranged opposite to each other, the first pressing roller (41) being mounted between the two first mounting structures (51), and the second pressing roller (42) being mounted between the two second mounting structures (52); the first driving mechanism comprises two first driving structures (6), and the two first driving structures (6) are capable of respectively driving the two first mounting structures (51) to move towards or away from the second pressing roller (42).

3. The battery pole piece forming equipment according to claim 1, characterized in that: The third driving mechanism comprises two third driving structures (9), and each of the third driving structures (9) is capable of driving the corresponding fourth mounting structure (73) to move in a direction approaching or away from the third mounting structure (72).

4. The battery pole piece forming equipment according to claim 3, characterized in that: The third driving structure (9) comprises a driving member, a pushing block (93) and a first elastic member, wherein the driving member is capable of driving the pushing block (93) to move in a vertical direction, and the first elastic member is arranged between the corresponding third mounting structure (72) and the fourth mounting structure (73), and when the driving member drives the pushing block (93) to move downward, the pushing block (93) is capable of pushing the fourth mounting structure (73) to move in a direction close to the corresponding third mounting structure (72).

5. The battery pole piece forming equipment according to claim 4, characterized in that: The third driving structure (9) further comprises a second elastic member (94), wherein the second elastic member (94) is arranged between the pushing block (93) and the supporting structure (71).

6. The battery pole piece forming equipment according to claim 1, characterized in that: The feeding mechanism (3) comprises at least two feeding hoppers (31), wherein a feeding port of one of the feeding hoppers (31) is located above the gap between the first pressing roller (41) and the second pressing roller (42), and a feeding port of the other feeding hopper (31) is located above the gap between the third pressing roller (43) and the fourth pressing roller (44).

7. A battery pole piece forming method, characterized in that: Applicable to the battery pole piece forming equipment according to any one of claims 1 to 6, the battery pole piece forming method comprises the following steps: S1, rolling the active material particles simultaneously to form a first film sheet and a second film sheet of the same thickness; S2: rolling the first film sheet and the second film sheet onto two sides of the substrate (100) respectively.

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