Pole piece heat sealing device, pole piece heat compounding equipment and pole piece assembly

Abstract

The utility model provides a pole piece heat-sealing device, pole piece heat compounding equipment and a pole piece assembly, the pole piece heat-sealing device comprises a first heat-sealing roller, a second heat-sealing roller, a third heat-sealing roller and a fourth heat-sealing roller, the second heat sealing roller is arranged on the side, away from the first diaphragm, of the second diaphragm; the outer surface of the first heat sealing roller is provided with first protrusions, the outer surface of the second heat sealing roller is provided with second protrusions, and the first protrusions and the second protrusions are arranged in a staggered mode in the length direction of the diaphragm blank leaving section. A part of the diaphragm blank section is located between the first heat sealing roller and the second heat sealing roller, and the first diaphragm and the second diaphragm are connected through the hot pressing effect of the first protrusions and the second protrusions.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a pole piece heat sealing device, heat composite equipment and a pole piece assembly. Background Art

[0002] Thermal composite lamination is to thermally composite the positive electrode sheet, the negative electrode sheet, and the diaphragm to form a continuous thermal composite unit, and then stack the thermal composite units to form a battery core pack. The two adjacent thermal composite units are connected by a diaphragm blank section. The diaphragm blank section is configured to consist of two layers of diaphragms, without positive electrode sheets and negative electrode sheets. In related technologies, the diaphragm blank section is used to bend the upper thermal composite unit and the lower thermal composite unit. If the two layers of diaphragms in the diaphragm blank section are not sealed, the negative electrode sheet is likely to be delaminated, which will cause the battery core pack to be unable to be stacked normally. Utility Model Content

[0003] The embodiments of the present utility model provide a pole piece heat sealing device, a heat compounding device and a pole piece assembly, which can improve the technical problem of unsealing between two layers of diaphragms in the blank section of the diaphragm of the pole piece assembly.

[0004] In a first aspect, an embodiment of the present invention provides a pole piece heat sealing device for heat sealing a pole piece assembly, wherein the pole piece assembly includes a plurality of pole piece group units and a diaphragm blank section, and adjacent pole piece group units are connected by a diaphragm blank section, and each diaphragm blank section includes a first diaphragm and a second diaphragm, and the pole piece heat sealing device includes:

[0005] a first heat-sealing roller, disposed on a side of the first diaphragm facing away from the second diaphragm;

[0006] a second heat-sealing roller, disposed on a side of the second diaphragm facing away from the first diaphragm;

[0007] Particularly, the outer surface of the first heat-sealing roller is provided with a first protrusion toward the second heat-sealing roller, and the outer surface of the second heat-sealing roller is provided with a second protrusion toward the first heat-sealing roller, the first protrusion and the second protrusion extend along the width direction of the blank section of the diaphragm, and are staggered along the length direction of the blank section of the diaphragm, and the first protrusion and the second protrusion are used to abut the blank section of the diaphragm to connect the first diaphragm and the second diaphragm.

[0008] In one embodiment, the distance between the center of the first protrusion and the center of the second protrusion along the length direction of the diaphragm blank section is set to a, and the length of the diaphragm blank section is set to w, wherein the ratio between a and w is 3 / 10 to 7 / 10.

[0009] In one embodiment, the maximum width of the first protrusion is d1, and the maximum width of the second protrusion is d2, wherein the sum of d1 and d2 is less than w; and / or d1 is greater than 0.2 mm and d1 is not greater than 0.5w; and / or d2 is greater than 0.2 mm and d1 is not greater than 0.5w.

[0010] In one embodiment, the height of the first protrusion or the second protrusion is set to 0.1 mm to 1.0 mm.

[0011] In one embodiment, a first heating element is provided in the first heat sealing roller, the first heating element is used to heat the first heat sealing roller, and the operating temperature of the first heating element is set to 0°C to 200°C; and / or a second heating element is provided in the second heat sealing roller, the second heating element is used to heat the second heat sealing roller, and the operating temperature of the second heating element is set to 0°C to 200°C.

[0012] In one embodiment, the invention further includes a first driving device connected to the first heat-sealing roller, and a second driving device connected to the second heat-sealing roller, wherein the first driving device is used to drive the first heat-sealing roller to rotate along a first direction, and the second driving device is used to drive the second heat-sealing roller to rotate along a second direction, wherein the first direction and the second direction are opposite to each other, and the first direction and the second direction are perpendicular to the width direction of the blank section of the diaphragm.

[0013] In one embodiment, it further includes a first fixing seat and a second fixing seat, the first heat sealing roller is fixed on the first fixing seat, the second heat sealing roller is fixed on the second fixing seat, and the distance between the first fixing seat and the second fixing seat is set to be adjustable, thereby adjusting the distance between the first protrusion and the second protrusion.

[0014] In one embodiment, it further includes a high-temperature resistant adhesive layer, which is coated on the surface of the first heat-sealing roller and does not cover the first protrusion, and / or the high-temperature resistant adhesive layer is coated on the surface of the second heat-sealing roller and does not cover the second protrusion.

[0015] In one embodiment, the first protrusion or the second protrusion is configured as a straight protrusion, a sawtooth protrusion, or a curved protrusion.

[0016] In a second aspect, an embodiment of the present invention provides a pole piece thermal composite device, which includes the pole piece heat sealing device and a lamination device, wherein the lamination device is located after the pole piece heat sealing device.

[0017] In the third aspect, an embodiment of the present invention provides a pole piece assembly, which includes a plurality of thermal composite pole piece group units and a diaphragm blank section, and adjacent two thermal composite pole piece group units are connected by a diaphragm blank section, and the diaphragm blank section includes a first diaphragm and a second diaphragm, and the first diaphragm and the second diaphragm form a heat-sealed edge through the above-mentioned pole piece heat-sealing device.

[0018] In one embodiment, the heat-sealed edge is configured to be straight, curved or zigzag.

[0019] Beneficial effects of the embodiments of the present utility model:

[0020] In an embodiment of the present invention, the first protrusion and the second protrusion are staggered so that the first heat-sealing roller and the second heat-sealing roller form a staggered bite when heat-sealing the blank section of the diaphragm, thereby forming a double sealing edge on the blank section of the diaphragm, thereby making the sealing edge formed by the heat seal have stronger sealing performance, effectively preventing the first diaphragm and the second diaphragm from separating, thereby effectively improving the problem of negative electrode plate stratification. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the pole piece assembly provided in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the device flow of the electrode thermal composite equipment provided by an embodiment of the present utility model;

[0024] Figure 3 Schematic diagram of the structure of the electrode heat sealing device provided by an embodiment of the present utility model;

[0025] Figure 4 yes Figure 3 A partial enlarged view of

[0026] Figure 5 This is a schematic side sectional view of the electrode heat sealing device provided in the first embodiment of the present invention;

[0027] Figure 6 This is a front structural diagram of the electrode heat sealing device provided in the first embodiment of the present utility model;

[0028] Figure 7 This is a top view of the electrode after heat sealing by the electrode heat sealing device provided in the first embodiment of the present invention;

[0029] Figure 8 This is a schematic side sectional view of the electrode heat sealing device provided in the second embodiment of the present utility model;

[0030] Figure 9 This is a front structural schematic diagram of the electrode heat sealing device provided in the second embodiment of the present utility model;

[0031] Figure 10 This is a top view of the electrode after heat sealing by the electrode heat sealing device provided in the second embodiment of the present invention;

[0032] Figure 11 This is a schematic side sectional view of the electrode heat sealing device provided in the third embodiment of the present invention;

[0033] Figure 12 This is a front structural diagram of the electrode heat sealing device provided in the third embodiment of the present utility model;

[0034] Figure 13 This is a top view of the electrode after heat sealing by the electrode heat sealing device provided in the third embodiment of the present invention;

[0035] Figure Number:

[0036] 100, unloading device; 200, thermal lamination device; 300, heat sealing device; 400, lamination device;

[0037] 1. Pole piece assembly; 10. Thermal composite pole piece assembly unit; 101. First thermal composite pole piece; 102. Second thermal composite pole piece; 11. Positive pole piece; 12. Negative pole piece; 20. Separator blank section; 201. First separator; 202. Second separator;

[0038] 2. First heat-sealing roller; 21. First protrusion; 22. First heating element; 3. Second heat-sealing roller; 31. Second protrusion; 32. Second heating element; 4. High-temperature resistant layer; 51. First fixing seat; 52. Second fixing seat; 53. First driving device; 54. Second driving device; DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0040] The embodiment of the present invention provides a battery, wherein a plurality of batteries can be combined to form an energy storage battery pack or a power battery pack. The battery can be a cylindrical battery or a square battery.

[0041] The battery includes a housing, a pole piece assembly, and an electrolyte. The pole piece assembly is arranged inside the housing, and the electrolyte is filled in the pole piece assembly.

[0042] The electrode assembly 1 includes a plurality of thermal composite electrode group units 10 stacked in sequence, each thermal composite electrode group unit 10 includes a positive electrode 11, a first separator 201, a negative electrode 12 and a second separator 202 stacked in sequence. Before stacking, Figure 1 As shown, the electrode assembly 1 includes a plurality of adjacent first thermal composite electrode sheets 101 and second thermal composite electrode sheets 102, wherein the positive electrode sheet 11 of the first thermal composite electrode sheet 101 is located on the upper surface of the first diaphragm 201, and the negative electrode sheet 12 is located between the first diaphragm 201 and the second diaphragm 202. The positive electrode sheet 11 of the second thermal composite electrode sheet 102 is located on the lower surface of the second diaphragm 202, and the negative electrode sheet 12 is located between the first diaphragm 201 and the second diaphragm 202. The adjacent first thermal composite electrode sheets 101 and the second thermal composite electrode sheets 102 are connected by a diaphragm blank section 20, and the diaphragm blank section 20 includes a first diaphragm 201 and a second diaphragm 202 arranged at intervals.

[0043] The embodiment of the present utility model provides a pole piece thermal composite device, such as Figure 2 As shown, the pole piece thermal composite equipment includes a discharge device 100 , a thermal composite device 200 and a lamination device 400 .

[0044] The unloading device 100 includes a positive electrode sheet unloading reel, a negative electrode sheet unloading reel, a first separator unloading reel, and a second separator unloading reel. The negative electrode sheet unloading reel is located between the first separator unloading reel and the second separator unloading reel. The positive electrode sheet unloading reel includes an upper positive electrode sheet unloading reel and a lower positive electrode sheet unloading reel. The upper positive electrode sheet unloading reel is used to provide the positive electrode sheet of the first thermal composite electrode sheet, and the lower positive electrode sheet unloading reel is used to provide the positive electrode sheet of the second thermal composite electrode sheet.

[0045] The thermal composite device 200 is located after the unloading device. The thermal composite device is used to combine the positive electrode sheet provided by the positive electrode sheet unloading roll, the first diaphragm provided by the first diaphragm unloading roll, the negative electrode sheet provided by the negative electrode sheet unloading roll, and the second diaphragm provided by the second diaphragm unloading roll together by thermal pressing.

[0046] The stacking device 400 is located after the thermal composite device. The stacking device 400 is used to stack multiple adjacent first thermal composite electrodes and second thermal composite electrodes in sequence along the thickness direction of the electrodes, so that the second thermal composite electrodes are located above the first thermal composite electrodes.

[0047] The adjacent first and second thermal composite electrode sheets are connected by a separator blank section, which is configured to be composed of unconnected first and second separators. In related art, the separator blank section is used to bend the first and second thermal composite electrode sheets during the stacking process. If the two separator layers in the separator blank section are not connected, the negative electrode sheet is prone to delamination, which can prevent the battery cell pack from being properly stacked.

[0048] In the embodiment of the present application, a pole piece heat sealing device 300 is also provided. Figure 2 and Figure 3 The pole piece heat sealing device 300 is located between the thermal composite device 200 and the lamination device 400. The pole piece heat sealing device 300 is used to connect the first diaphragm 201 and the second diaphragm 202 together by heat sealing.

[0049] The electrode heat sealing device 300 includes a first heat sealing roller 2 and a second heat sealing roller 3. The first heat sealing roller 2 is arranged on the side of the first diaphragm 201 away from the second diaphragm 202 along the thickness direction of the diaphragm blank section 20, and the second heat sealing roller 3 is arranged on the side of the second diaphragm 202 away from the first diaphragm 201 along the thickness direction of the diaphragm blank section 20.

[0050] The outer surface of the first heat sealing roller 2 is provided with a first protrusion 21, and the outer surface of the second heat sealing roller 3 is provided with a second protrusion 31. The first protrusion 21 and the second protrusion 31 are staggered along the length direction of the diaphragm blank section 20. The first protrusion 21 and the second protrusion 31 are both arranged to extend along the width direction of the diaphragm blank section 20. A portion of the diaphragm blank section 20 is located between the first heat sealing roller 2 and the second heat sealing roller 3 and is connected to the first diaphragm 201 and the second diaphragm 202 through the hot pressing action of the first protrusion 21 and the second protrusion 31, wherein the length direction of the diaphragm blank section 20 is Figure 3 The X direction shown, the thickness direction of the diaphragm blank section 20 is Figure 3 In the Z direction shown, the width direction of the diaphragm blank section 20 is Figure 6 Y direction shown.

[0051] By staggering the first protrusion 21 and the second protrusion 31, the first heat-sealing roller 2 and the second heat-sealing roller 3 form a staggered bite when heat-sealing the blank section 20 of the diaphragm, thereby forming a diamond-shaped sealing edge on the blank section 20 of the diaphragm, thereby making the sealing edge formed by the heat seal have stronger sealing performance, effectively preventing the first diaphragm and the second diaphragm from separating, and effectively improving the problem of negative electrode plate stratification.

[0052] Continue to refer Figure 4 As shown, the distance between the center of the first protrusion 21 and the center of the second protrusion 31 is set to a, and the length of the blank section 20 is set to w, where the ratio of a to w is 3 / 10 to 7 / 10. In a specific implementation, the ratio of a to w can be 3 / 10, 2 / 5, 1 / 2, 3 / 5, 7 / 10, or a value between any two of the above values, or a range between any two of the above values.

[0053] In one embodiment, the spacing between the first protrusion 21 and the second protrusion 31 is defined as the difference between the distance between the center of the first protrusion 21 and one side of the membrane blank section 20 and the distance between the center of the second protrusion 31 and the same side of the membrane blank section 20. In one specific implementation, the length w of the membrane blank section 20 is set to 2.0 mm, the distance between the center of the first protrusion 21 and the left side of the membrane blank section 20 is 0.6 mm, the distance between the second protrusion 31 and the left side of the membrane blank section 20 is 1.4 mm, and the spacing a between the center of the first protrusion 21 and the center of the second protrusion 31 is set to 0.8 mm.

[0054] Through research, the inventors found that if the ratio of the interval a between the first protrusion 21 and the second protrusion 31 to the length w of the diaphragm blank section 20 is less than 3 / 10, the distance between the first protrusion 21 and the second protrusion 31 will be too close, and an effective staggered bite cannot be formed, thereby affecting the sealing performance of the sealing edge formed by the heat sealing of the diaphragm blank section 20. If the ratio of the interval a between the first protrusion 21 and the second protrusion 31 to the length w of the diaphragm blank section 20 is greater than 7 / 10, the first protrusion 21 will be too close to the left side of the blank section 20, and the second protrusion 31 will be too close to the right side of the blank section 20. It can be understood that when the first protrusion 21 is too close to the left side of the blank section 20, the heat sealing energy of the first protrusion 21 will affect the first thermal composite electrode 101 on the left, thereby affecting the electrical properties of the first thermal composite electrode 101. When the second protrusion 31 is too close to the right side of the blank section 20, the heat sealing energy of the second protrusion 31 will affect the second thermal composite electrode 102 on the right, thereby affecting the electrical properties of the second thermal composite electrode 102.

[0055] Continue to refer Figure 4 The maximum width of the first protrusion 21 is set to d1, and the maximum width of the second protrusion 31 is set to d2, wherein the widths of the first protrusion 21 and the second protrusion 31 are both set to the length extending along the length direction of the diaphragm blank section 20, and the sum of d1 and d2 is less than w.

[0056] It is understandable that if the sum of the widths of the first protrusion 21 and the second protrusion 31 is greater than the length of the diaphragm blank section 20, the first protrusion 21 will be too close to the first thermal composite electrode 101 on the left side of the diaphragm blank section 20, or even cause the first protrusion 21 to contact the first thermal composite electrode 101 on the left side of the diaphragm blank section 20, thereby crushing the first thermal composite electrode 101, or cause the second protrusion 31 to be too close to the second thermal composite electrode 102 on the right side of the diaphragm blank section 20, or even cause the second protrusion 31 to contact the second thermal composite electrode 102 on the right side of the diaphragm blank section 20, thereby crushing the second thermal composite electrode 102.

[0057] Furthermore, the maximum width d1 of the first protrusion 21 is set to be greater than 0.2 mm and not greater than 0.5 w. And / or the maximum width d2 of the second protrusion 31 is set to be greater than 0.2 mm and not greater than 0.5 w.

[0058] Through research, the inventors found that when the maximum width d1 of the first protrusion 21 or the maximum width d2 of the second protrusion 31 is set to less than 0.2 mm, due to the small overall width of the first protrusion 21 and the second protrusion 31, during the process of the first protrusion 21 and the second protrusion 31 forming a longitudinal bite on the diaphragm blank section 20, the first protrusion 21 and the second protrusion 31 are easily broken, affecting the service life of the first heat sealing roller 2 and the second heat sealing roller 3.

[0059] Furthermore, when the width d1 of the first protrusion 21 or the width d2 of the second protrusion 31 is set to be greater than 0.5w, under the premise that the structures of the first protrusion 21 and the second protrusion 31 are basically the same, it is easy to cause the sum of the width d1 of the first protrusion 21 and the width d2 of the second protrusion 31 to be greater than the length w of the blank section 20 of the diaphragm, thereby causing the first protrusion 21 to form a heat seal with the first thermal composite electrode 101, or the second protrusion 31 to form a heat seal with the second thermal composite electrode 102.

[0060] Continue to refer Figure 4 The height of the first protrusion 21 is set to h1, wherein the height of the first protrusion 21 is set to be the same as the thickness direction of the thermal composite electrode assembly unit, and h1 is set to 0.1mm to 1.0mm. In a specific implementation, the height h1 of the first protrusion 21 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, or a value between any two of the above values, or a range between any two of the above values.

[0061] The height of the second protrusion 31 is set to h2, wherein the height of the second protrusion 31 is set to be the same as the thickness direction of the thermal composite electrode assembly unit, and h2 is set to 0.1mm to 1.0mm. In a specific implementation, the height h2 of the second protrusion 31 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, or a value between any two of the above values, or a range between any two of the above values.

[0062] Through research, the inventors found that when the height h1 of the first protrusion 21 or the height h2 of the second protrusion 31 is set to less than 0.1 mm, the first protrusion 21 or the second protrusion 31 will be too small. During the process of the first protrusion 21 and the second protrusion 31 biting along their height direction, the first protrusion 21 and the second protrusion 31 are likely to break, affecting the service life of the first heat-sealing roller 2 and the second heat-sealing roller 3.

[0063] Furthermore, when the height h1 of the first protrusion 21 or the height h2 of the second protrusion 31 is set to be greater than 1.0 mm, while the widths of the first protrusion 21 and the second protrusion 31 remain constant, the first protrusion 21 and the second protrusion 31 will become too slender and easily break, thereby affecting the service life of the first heat sealing roller 2 and the second heat sealing roller 3.

[0064] Continue to refer Figure 3 A first heating element 22 is provided in the first heat sealing roller 2. The first heating element 22 is used to heat the first heat sealing roller 2. The working temperature of the first heating element 22 is set to 0℃~200℃. The maximum working temperature of the first heating element 22 is greater than the hot melting temperature of the first diaphragm 201, so that the first protrusion 21 can melt the first diaphragm 201 when it is pressed against the first diaphragm 201.

[0065] Correspondingly, a second heating element 32 is provided in the second heat sealing roller 3, and the second heating element 32 is used to heat the second heat sealing roller 3. The working temperature of the second heating element 32 is set at 0℃~200℃. The maximum working temperature of the second heating element 32 is greater than the hot melt temperature of the second diaphragm 202, so that the second protrusion 31 can melt the second diaphragm 202 when it is pressed against the second diaphragm 202.

[0066] The first heating element 22 or the second heating element 32 includes an electric heating rod whose temperature is adjustable within a temperature range of 0°C to 200°C, thereby enabling the first heat sealing roller 2 or the second heat sealing roller 3 to have heating and constant temperature functions.

[0067] The electrode heat sealing device also includes a first drive device 53 and a second drive device 54. The first drive device 53 and the second drive device 54 can be motors. The first drive device 53 is connected to the first heat sealing roller 2 and is used to drive the first heat sealing roller 2 to rotate. The second drive device 54 is connected to the second heat sealing roller 3 and is used to drive the second heat sealing roller 3 to rotate. The first heat sealing roller 2 and the second heat sealing roller 3 have the same operating speed and the first heat sealing roller 2 and the second heat sealing roller 3 have opposite rotation directions, so that the first heat sealing roller 2 presses the first diaphragm 201 downward, and the second heat sealing roller 3 presses the second diaphragm 202 upward, so that the first diaphragm 201 and the second diaphragm 202 are close to each other and form a heat seal.

[0068] The rotational speeds of the first heat sealing roller 2 and the second heat sealing roller 3 are adjusted according to the operating speed of the electrode assembly 1, so that when the first heat sealing roller 2 and the second heat sealing roller 3 rotate one circle, the electrode assembly 1 moves one thermal composite electrode group unit 10, so that the first protrusion 21 of the first heat sealing roller 2 corresponds to the diaphragm blank section 20, and the second protrusion 31 of the second heat sealing roller 3 corresponds to the diaphragm blank section 20, so that the first protrusion 21 and the second protrusion 31 jointly heat seal the diaphragm blank section 20.

[0069] Monitors are provided before and after the electrode heat sealing device. The monitors are used to capture the specific position of the heat sealing device, and then control the heat sealing device to heat seal only the blank section of the diaphragm.

[0070] The electrode heat-sealing device also includes a first fixing seat 51 and a second fixing seat 52. The first heat-sealing roller 2 is fixed to the first fixing seat 51, and the second heat-sealing roller 3 is fixed to the second fixing seat 52. The spacing between the first fixing seat 51 and the second fixing seat 52 is configured to be adjustable, thereby also enabling the spacing between the first protrusion 21 and the second protrusion 31 to be adjustable. It is understood that different thermal composite electrode assembly units 10 have different thicknesses, and accordingly, the spacing between the first protrusion 21 and the second protrusion 31 needs to be adjusted according to the thickness of the different thermal composite electrode assembly units 10.

[0071] In a specific implementation, a first adjusting screw is connected between the first heat sealing roller 2 and the first driving device 53, and the first adjusting screw drives the main shaft of the first heat sealing roller 2 to rotate. A second adjusting screw is connected between the second heat sealing roller 3 and the second driving device 54, and the second adjusting screw drives the main shaft of the second heat sealing roller 3 to rotate. The relative position interval between the first heat sealing roller 2 and the second heat sealing roller 3 is adjusted by adjusting the length of the first adjusting screw and the second adjusting screw.

[0072] Continue to refer Figure 5 As shown, the outer surface of the first heat-sealing roller 2 except the first protrusion 21 is coated with a high-temperature resistant rubber layer 4, and the outer surface of the second heat-sealing roller 3 except the second protrusion 31 is coated with a high-temperature resistant rubber layer 4, so that when the first heat-sealing roller 2 and the second heat-sealing roller 3 are bitten up and down, no hard extrusion is formed, thereby preventing the diaphragm from being damaged or broken.

[0073] refer to Figure 5 、 Figure 6 and Figure 7 In the first embodiment provided herein, both the first protrusion 21 and the second protrusion 31 are configured as linear protrusions, and the corresponding heat-sealed edge 203 formed on the blank section 20 of the diaphragm is a linear edge. The first protrusion 21 and the second protrusion 31 are configured as linear protrusions, so that the first protrusion 21 provides a uniform force during the heat-sealing process on the first diaphragm 201, and the second protrusion 31 provides a uniform force during the heat-sealing process on the second diaphragm 202. This ensures that the fusion strength of the heat-sealed edge 203 of the first and second diaphragms 201, 202 is substantially uniform throughout the heat-sealed edge 203, avoiding uneven local force that could result in insufficient strength.

[0074] refer to Figure 8 、 Figure 9 and Figure 10In the second embodiment provided in the present application, the first protrusion 21 and the second protrusion 31 are both configured as serrated protrusions, and the corresponding heat-sealed edge 203 formed on the blank section 20 of the diaphragm is a serrated edge. Compared with the linear edge, the serrated edge has a stronger bonding strength and is more conducive to preventing the first diaphragm 201 and the second diaphragm 202 from delamination after bonding.

[0075] refer to Figure 11 、 Figure 12 and Figure 13 In the third embodiment provided in the present application, the first protrusion 21 and the second protrusion 31 are both set as wavy protrusions, and the corresponding heat-sealed edge 203 formed on the blank section 20 of the diaphragm is a wavy edge. Compared with the linear edge, the wavy edge has a stronger bonding strength and is more conducive to preventing the first diaphragm 201 and the second diaphragm 202 from delamination after being combined.

[0076] In the embodiment of the application, a pole piece thermal composite device is also provided, such as Figure 2 As shown, the electrode heat-sealing device includes a discharge device 100, a heat-sealing device 200, a electrode heat-sealing device 300 and a stacking device 400, wherein the electrode heat-sealing device 300 is arranged after the heat-sealing device 200 and before the stacking device 400, and the electrode heat-sealing device 300 includes the electrode heat-sealing device provided in the above embodiment, and the first diaphragm 201 and the second diaphragm 202 of the diaphragm blank section 20 are staggeredly heat-sealed by the electrode heat-sealing device, so that the sealing performance of the heat-sealed edge 203 formed after the first diaphragm 201 and the second diaphragm 202 are better.

[0077] In an embodiment of the present application, a pole piece assembly is also provided, such as Figure 2 、 Figure 7 、 Figure 10 and Figure 13 As shown, the electrode assembly 1 includes a plurality of thermal composite electrode group units 10 and a diaphragm blank section 20 connecting two adjacent thermal composite electrode group units 10, and the diaphragm blank section 20 includes a first diaphragm 201 and a second diaphragm 202, wherein the first diaphragm 201 and the second diaphragm 202 use the heat sealing device provided in the above embodiment to form a heat sealing edge, and the heat sealing edge can be straight, serrated or wavy.

[0078] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A pole piece heat sealing device for heat sealing a pole piece assembly, wherein the pole piece assembly comprises a plurality of pole piece group units and a diaphragm blank section, wherein two adjacent pole piece group units are connected by a diaphragm blank section, and each diaphragm blank section comprises a first diaphragm and a second diaphragm, characterized in that: The pole piece heat sealing device comprises: a first heat-sealing roller, arranged on a side of the first diaphragm away from the second diaphragm along the thickness direction of the blank section of the diaphragm; a second heat-sealing roller, arranged on a side of the second diaphragm facing away from the first diaphragm along the thickness direction of the blank section of the diaphragm; Particularly, the outer surface of the first heat-sealing roller is provided with a first protrusion toward the second heat-sealing roller, and the outer surface of the second heat-sealing roller is provided with a second protrusion toward the first heat-sealing roller, the first protrusion and the second protrusion extend along the width direction of the blank section of the diaphragm, and are staggered along the length direction of the blank section of the diaphragm, and the first protrusion and the second protrusion are used to abut the blank section of the diaphragm to connect the first diaphragm and the second diaphragm.

2. The electrode heat sealing device according to claim 1, characterized in that: The distance between the center of the first protrusion and the center of the second protrusion along the length direction of the membrane blank section is set to a, and the length of the membrane blank section is set to w, wherein the ratio between a and w is 3 / 10 to 7 / 10.

3. The electrode heat sealing device according to claim 2, characterized in that: The maximum width of the first protrusion is d1, and the maximum width of the second protrusion is d2, wherein the sum of d1 and d2 is less than w; and / or d1 is greater than 0.2 mm and d1 is not greater than 0.5w; and / or d2 is greater than 0.2 mm and d1 is not greater than 0.5w.

4. The pole piece heat sealing device according to claim 3, characterized in that: The height of the first protrusion or the second protrusion is set to 0.1 mm to 1.0 mm.

5. The electrode heat sealing device according to claim 1, characterized in that: A first heating element is provided in the first heat sealing roller, and the first heating element is used to heat the first heat sealing roller, and the operating temperature of the first heating element is set to 0°C to 200°C; and / or a second heating element is provided in the second heat sealing roller, and the second heating element is used to heat the second heat sealing roller, and the operating temperature of the second heating element is set to 0°C to 200°C.

6. The pole piece heat sealing device according to claim 5, characterized in that: It also includes a first driving device connected to the first heat-sealing roller, and a second driving device connected to the second heat-sealing roller, the first driving device is used to drive the first heat-sealing roller to rotate along a first direction, and the second driving device is used to drive the second heat-sealing roller to rotate along a second direction, the first direction and the second direction are opposite, and the first direction and the second direction are perpendicular to the width direction of the blank section of the diaphragm.

7. The electrode heat sealing device according to claim 5, characterized in that: It also includes a first fixing seat and a second fixing seat, the first heat sealing roller is fixed on the first fixing seat, the second heat sealing roller is fixed on the second fixing seat, and the distance between the first fixing seat and the second fixing seat is set to be adjustable, thereby adjusting the distance between the first protrusion and the second protrusion.

8. The electrode heat sealing device according to any one of claims 1 to 7, characterized in that: It also includes a high-temperature resistant adhesive layer, which is coated on the surface of the first heat-sealing roller and does not cover the first protrusion; and / or, the high-temperature resistant adhesive layer is coated on the surface of the second heat-sealing roller and does not cover the second protrusion.

9. The electrode heat sealing device according to any one of claims 1 to 7, characterized in that: The first protrusion or the second protrusion is configured as a straight protrusion, a sawtooth protrusion or a curved protrusion.

10. A pole piece thermal composite device, characterized in that: The electrode heat-combining equipment comprises the electrode heat-sealing device and the laminating device according to any one of claims 1 to 9, and the laminating device is located after the electrode heat-sealing device.

11. A pole piece assembly, characterized in that: The electrode assembly includes multiple thermal composite electrode group units and diaphragm blank sections. Adjacent two thermal composite electrode group units are connected by diaphragm blank sections. The diaphragm blank sections include a first diaphragm and a second diaphragm. The first diaphragm and the second diaphragm form a heat-sealed edge through the electrode heat-sealing device according to any one of claims 1 to 9.

12. The pole piece assembly according to claim 11, characterized in that: The heat-sealed edge is configured in a straight line, a curve or a zigzag shape.

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