Segmented molding method and system for battery junks

Abstract

The application discloses a segmented plastic forming method and system suitable for a battery roll core, and comprises the following steps: the battery roll core is supported apart by a blanking roll needle mechanism; the R angle at both ends of the battery roll core is clamped by a clamping jaw mechanism to fix the R angle; the battery roll core is transported together with the blanking roll needle mechanism and the clamping jaw mechanism to a hot pressing station by a transfer mechanism; the region between the R angles at both ends of the battery roll core is subjected to one-time hot pressing with variable speed by an intermediate plastic forming plate in a segmented hot pressing plate; the R angle regions at both ends of the battery roll core are subjected to pre-pressing with variable pressure by a first side edge plastic forming plate and a second side edge plastic forming plate on both sides of the intermediate plastic forming plate in the segmented hot pressing plate; the clamping jaw mechanism is removed, and the battery roll core is subjected to two-time hot pressing by the intermediate plastic forming plate, the first side edge plastic forming plate and the second side edge plastic forming plate at the same time, and the plastic forming is finished. The application can improve the situation that the R angle is dropped and wrinkled due to stress release of the battery roll core in the hot pressing process.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology, specifically relating to a segmented molding method and system suitable for battery cores. Background Technology

[0002] Lithium-ion batteries have become the energy source for electronic products, electric vehicles, and energy storage due to their high energy density and rechargeability. In current technology, to improve the capacity and range of lithium-ion batteries, core design is increasingly moving towards high-compact designs. However, high-compact cores are prone to large-area collapse during hot pressing, easily causing large wrinkles, especially on the negative electrode. These wrinkles increase the risk of foil leakage. Furthermore, to ensure the molding effect, high-compact cores are more prone to material loss during hot pressing. After high-pressure hot pressing, the electrode sheets of high-compact cores release stress to the R-corner (the bending radius of the battery core edge), leading to severe material loss at the R-corner and even light transmission at the R-corner, resulting in reduced cell yield and significantly increased safety risks. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a segmented molding method and system suitable for battery cores, which can improve the situation of R-corner material loss and wrinkling caused by stress release of the core during hot pressing.

[0004] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0005] In a first aspect, the present invention provides a segmented molding method suitable for battery cores, comprising:

[0006] The battery core is opened using a feeding and winding needle mechanism;

[0007] The gripper mechanism is used to clamp the R-angles at both ends of the battery core to fix the R-angles;

[0008] The battery core, along with the unloading winding mechanism and the gripper mechanism, is transferred to the hot pressing station using a transfer mechanism.

[0009] The middle molding plate in the segmented hot press plate is used to perform variable speed hot pressing on the area between the two ends R angle of the battery core.

[0010] The first and second side molding plates located on both sides of the middle molding plate in the segmented hot press plate are used to perform variable pressure pre-compression on the R-corner areas at both ends of the battery core.

[0011] The gripper mechanism is removed, and the battery core is simultaneously subjected to secondary hot pressing using the intermediate molding plate, the first side molding plate, and the second side molding plate, thus completing the molding process.

[0012] In the above scheme, the area between the two ends of the battery core (i.e., the large surface of the battery core) is first hot-pressed at a variable speed using an intermediate molding plate. This disperses the stress on the large surface to the two ends of the battery core at the R-corners. Then, the first and second side molding plates are used to pre-press the R-corner area at both ends with variable pressure (i.e., variable pressure molding). This greatly reduces the risk of material loss due to high pressure molding of the R-corners in a short period of time. Finally, the intermediate molding plate, the first side molding plate, and the second side molding plate are used to perform a second hot-press on the battery core. This ensures that the stress of the entire high-pressure compacted core is gradually released, avoiding internal folds and R-corner material loss, and greatly improving the overall process yield and safety performance of the battery cell.

[0013] In conjunction with the first aspect, optionally, the feeding winding mechanism includes a first feeding winding needle and a second feeding winding needle; the step of using the feeding winding needle mechanism to open the battery core specifically includes:

[0014] After the first and second feeding needles are inserted into the inside of the battery core, they are pressed against the R-angles at both ends of the battery core, and then the battery core is opened at a uniform speed.

[0015] In the above solution, the first and second feeding needles work together to open the battery core, which can effectively reduce the damage to the battery core.

[0016] In conjunction with the first aspect, optionally, the gripper mechanism includes a first gripper, a second gripper, a third gripper, and a fourth gripper; the R-angles at both ends of the battery core are defined as the first R-angle and the second R-angle, respectively;

[0017] The method of using a gripper mechanism to clamp the R-angles at both ends of the battery core specifically includes:

[0018] The first R-angle is fixed by using the first and second grippers to clamp it.

[0019] The second R-angle is fixed by using the third and fourth grippers to clamp it.

[0020] In the above scheme, before hot pressing, a gripper mechanism is used to fix the first R-angle and the second R-angle, which can effectively prevent the large surface of the battery core from collapsing and avoid the risk of inward folding during hot pressing.

[0021] In conjunction with the first aspect, optionally, the heating temperatures of the intermediate molding plate, the first side molding plate, and the second side molding plate are all the same, and the heating temperature range is 25℃~120℃.

[0022] In the above solution, by setting the heating temperature of the middle molding plate, the first side molding plate and the second side molding plate to be the same, it can be ensured that the thermoforming effect of each area of ​​the battery core is the same, and the thermoforming failure caused by uneven heating temperature can be effectively prevented.

[0023] In conjunction with the first aspect, optionally, the intermediate molding plate has a downward pressure range of 5~20t during a single hot pressing process, and the molding speed gradually decreases.

[0024] In the above scheme, the intermediate molding plate maintains a fixed pressure throughout the hot pressing process, which can prevent a series of quality problems such as warping and uneven thickness, and ensure that the final product meets the design requirements in terms of dimensional accuracy, internal structure, mechanical properties and long-term stability.

[0025] In conjunction with the first aspect, optionally, when the intermediate molding plate presses down the area between the two ends of the battery core to a specified height, the first hot pressing of the intermediate molding plate ends, wherein the specified height is 1 / 3 to 1 / 2 of the initial height of the area between the two ends of the battery core.

[0026] The above solution specifies the conditions for ending the first hot pressing, which can effectively prevent problems such as tearing of the battery core caused by excessive pressing height.

[0027] In conjunction with the first aspect, optionally, when the first side molding plate, the second side molding plate, and the middle molding plate are on the same horizontal plane, the first side molding plate and the second side molding plate finish pre-pressing.

[0028] The above scheme specifies the termination conditions for the pre-pressing of the first and second side molding plates, in order to prepare for the secondary hot pressing and ensure that the stress is gradually released.

[0029] In conjunction with the first aspect, optionally, during the pre-compression process, the downward pressure of the first side molding plate and the second side molding plate gradually decreases with the downward pressure height, and satisfies the following formula:

[0030] f = F * (h / H) * σ;

[0031] In the formula, f is the pressing pressure of the first or second side molding plate during the pre-pressing process; F is the pressing pressure of the first or second side molding plate in the initial state; h is the current pressing height of the R-corner area; H is the initial height of the R-corner area; σ is the correction coefficient, with a value range of 0 to 1.

[0032] In the above solution, by setting the downward pressure of the first side molding plate and the second side molding plate to gradually decrease with the downward pressure height, the risk of material falling off the R-angle due to high pressure molding in a short period of time can be greatly reduced.

[0033] In conjunction with the first aspect, optionally, the pressing speed of the intermediate molding plate in the first hot pressing process is greater than the pressing speed in the second hot pressing process, and in the second hot pressing process, the pressing speeds of the first side molding plate, the intermediate molding plate, and the second side molding plate are the same.

[0034] The above solution proposes to use slow, fixed-pressure secondary molding. By maintaining a fixed pressure, the stress can be released slowly and evenly, ensuring that the molded battery core will not "spring back" or twist.

[0035] Secondly, the present invention provides a segmented molding system suitable for battery winding cores, comprising:

[0036] The feeding and winding needle mechanism is used to open up the battery core;

[0037] The gripper mechanism is used to clamp the R-angles at both ends of the battery core to fix the R-angles;

[0038] The transfer mechanism is used to transfer the battery core together with the unloading winding mechanism and the gripper mechanism to the hot pressing station.

[0039] The hot press plate includes a first side molding plate, a middle molding plate, and a second side molding plate arranged sequentially. The first side molding plate and the second side molding plate are respectively located directly above the R-corner areas at both ends of the battery core, and are used to thermoform the R-corner areas at both ends of the battery core. The middle molding plate is located directly above the area in the battery core located between the two R-corners, and is used to thermoform the area in the battery core located between the two R-corners.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] This invention first uses an intermediate molding plate to perform a variable-speed hot-pressing on the area between the two ends of the battery core (i.e., the large surface of the battery core), dispersing the stress of the large surface to the two ends of the battery core at the R-corners. Then, the first and second side molding plates are used to perform variable-pressure pre-pressing (i.e., variable-pressure molding) on ​​the R-corner area at both ends, greatly reducing the risk of material loss due to high pressure molding of the R-corners in a short period of time. Finally, the intermediate molding plate, the first side molding plate, and the second side molding plate are used simultaneously to perform a second hot-pressing on the battery core, ensuring that the stress of the entire high-pressure compacted core is gradually released, avoiding internal folds and R-corner material loss, and greatly improving the overall process yield and safety performance of the battery cell. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. 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 effort, wherein:

[0043] Figure 1 This is a schematic flowchart of a segmented molding method according to an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the gripper mechanism fixing the two ends of the radius (R) according to an embodiment of the present invention;

[0045] Figure 3 This is a top view of the feeding winding needle mechanism of an embodiment of the present invention after the battery core has been opened;

[0046] Figure 4 This is a schematic diagram of the structure of a battery core being transferred to a hot pressing station according to an embodiment of the present invention;

[0047] The markings in the diagram are: 1-battery core, 21-first gripper, 22-third gripper, 23-second gripper, 24-fourth gripper, 31-first feeding coil needle, 32-second feeding coil needle, 4-segmented hot press plate, 41-middle molding plate, 42-second side molding plate, 43-first side molding plate. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0050] Example 1

[0051] This invention provides a segmented molding method suitable for battery core 1, such as... Figure 1 As shown, the specific steps include:

[0052] (1) Use the feeding and winding needle mechanism to open up the battery core 1;

[0053] (2) The R-angle at both ends of the battery core 1 is clamped by the gripper mechanism to fix the R-angle, thus achieving the fixation of the battery core;

[0054] (3) The battery core 1, together with the unloading winding mechanism and the gripper mechanism, is transferred to the hot pressing station using the transfer mechanism;

[0055] (4) The middle molding plate 41 in the segmented hot press plate 4 at the hot press station is used to perform a variable speed hot press on the area between the two ends R angles in the battery core 1.

[0056] (5) The first side molding plate 43 and the second side molding plate 42 located on both sides of the middle molding plate 41 in the segmented hot press plate 4 are used to perform variable pressure pre-pressing on the R-corner area at both ends of the battery core 1; In the specific implementation process, the first side molding plate 43 and the second side molding plate 42 can be connected to the middle molding plate 41 by hinges so that the three can be used to perform hot pressing on different positions of the battery core respectively;

[0057] (6) Remove the gripper mechanism and use the middle molding plate 41, the first side molding plate 43 and the second side molding plate 42 to perform secondary hot pressing on the battery core 1, and the molding is completed.

[0058] In the above scheme, the intermediate molding plate 41 is first used to perform a variable speed hot pressing on the area between the two R-corners of the battery core 1 (i.e., the large surface of the battery core 1), so that the stress of the large surface is distributed to the R-corners at both ends of the battery core 1. Then, the first side molding plate 43 and the second side molding plate 42 are used to perform variable pressure pre-pressing (i.e., variable pressure molding) on ​​the R-corner area at both ends, which greatly reduces the risk of material loss due to high pressure molding of the R-corners in a short time. Finally, the intermediate molding plate 41, the first side molding plate 43 and the second side molding plate 42 are used to perform a second hot pressing on the battery core 1 at the same time, which ensures that the stress of the entire high-pressure compacted core is gradually released, avoids the situation of internal folding and R-corner material loss of the battery core 1, and greatly improves the overall process yield and safety performance of the battery cell.

[0059] In one specific embodiment of the present invention, the feeding winding needle mechanism includes a first feeding winding needle 31 and a second feeding winding needle 32; the step of using the feeding winding needle mechanism to open the battery core 1 specifically includes:

[0060] After the first feeding needle 31 and the second feeding needle 32 are inserted into the inside of the battery core 1, they are pressed against the R-angles at both ends of the battery core 1, and then the battery core 1 is opened at a uniform speed.

[0061] In the above scheme, the first feeding needle 31 and the second feeding needle 32 work together to complete the opening action of the battery core 1, which can effectively reduce the damage to the battery core.

[0062] In one specific embodiment of the present invention, the gripper mechanism includes a first gripper 21, a second gripper 23, a third gripper 22 and a fourth gripper 24; the R angles at both ends of the battery core 1 are defined as the first R angle and the second R angle, respectively;

[0063] The method of using a gripper mechanism to clamp the R-angles at both ends of the battery core 1 specifically includes:

[0064] The first R-angle is fixed by clamping the first gripper 21 and the second gripper 23.

[0065] The second R-angle is fixed by clamping it with the third gripper 22 and the fourth gripper 24.

[0066] In the above scheme, before hot pressing, a gripper mechanism is used to fix the first R-angle and the second R-angle, which can effectively prevent the large surface of the battery core 1 from collapsing and avoid the risk of inward folding during hot pressing. In specific implementation, the first gripper 21, the second gripper 23, the third gripper 22 and the fourth gripper 24 all have the function of moving in the vertical direction, which is used to cooperate with the first side molding plate 43 and the second side molding plate 42 to realize the hot pressing of the two R-angles.

[0067] In one specific embodiment of the present invention, the heating temperatures of the intermediate molding plate 41, the first side molding plate 43, and the second side molding plate 42 are all the same, and the heating temperature range is 25℃~120℃.

[0068] In the above scheme, by setting the heating temperature of the middle molding plate 41, the first side molding plate 43 and the second side molding plate 42 to be the same, it can be ensured that the thermoforming effect of each area of ​​the battery core 1 is the same, and the thermoforming failure caused by uneven heating temperature can be effectively prevented.

[0069] In one specific embodiment of the present invention, the downward pressure (i.e. molding pressure) of the intermediate molding plate 41 during a single hot pressing process ranges from 5 to 20 t, and the molding speed gradually decreases.

[0070] In the above scheme, the intermediate molding plate 41 maintains a fixed pressure throughout the hot pressing process, which can prevent a series of quality problems such as warping and uneven thickness, and ensure that the final product meets the design requirements in terms of dimensional accuracy, internal structure, mechanical properties and long-term stability.

[0071] In one specific embodiment of the present invention, when the intermediate molding plate 41 presses down the area between the two ends R-angles of the battery core 1 to a specified height, the first hot pressing of the intermediate molding plate 41 ends. The specified height is 1 / 3 to 1 / 2 of the initial height of the area between the two ends R-angles of the battery core 1.

[0072] The above solution specifies the conditions for ending the first hot pressing, which can effectively prevent problems such as tearing of the battery core 1 caused by excessive pressing height.

[0073] In one specific embodiment of the present invention, when the first side molding plate 43, the second side molding plate 42 and the middle molding plate 41 are on the same horizontal plane, the first side molding plate 43 and the second side molding plate 42 end the pre-pressing.

[0074] In the above scheme, the termination conditions of the pre-pressing of the first side molding plate 43 and the second side molding plate 42 are specifically defined to prepare for the secondary hot pressing and ensure that the stress is gradually released.

[0075] In one specific embodiment of the present invention, during the pre-pressing process, the pressing pressure of the first side molding plate 43 and the second side molding plate 42 gradually decreases with the pressing height, and satisfies the following formula:

[0076] f = F * (h / H) * σ;

[0077] In the formula, f is the pressing pressure of the first or second side molding plate during the pre-pressing process; F is the pressing pressure of the first or second side molding plate in the initial state; h is the current pressing height of the R-corner area; H is the initial height of the R-corner area; σ is the correction coefficient, with a value range of 0 to 1.

[0078] In the above solution, by setting the downward pressure of the first side molding plate 43 and the second side molding plate 42 to gradually decrease with the downward pressure height, the risk of material falling off the R-angle due to high pressure molding in a short period of time can be greatly reduced.

[0079] In one specific embodiment of the present invention, the pressing speed of the intermediate molding plate 41 during the first hot pressing process is greater than that during the second hot pressing process, and during the second hot pressing process, the pressing speeds of the first side molding plate 43, the intermediate molding plate 41, and the second side molding plate 42 are the same.

[0080] The above solution proposes to use slow, fixed-pressure secondary molding. By maintaining a fixed pressure, the stress can be released slowly and evenly, ensuring that the molded battery core 1 will not "spring back" or twist.

[0081] Example 2

[0082] This invention provides a segmented molding system suitable for battery core 1, such as... Figures 2-4 As shown, it includes:

[0083] The feeding and winding needle mechanism is used to open up the battery core 1;

[0084] The gripper mechanism is used to clamp the R-angles at both ends of the battery core 1 to fix the R-angles;

[0085] The transfer mechanism is used to transfer the battery core 1 together with the unloading winding mechanism and the gripper mechanism to the hot pressing station;

[0086] The segmented hot press plate 4 includes a first side molding plate 43, a middle molding plate 41, and a second side molding plate 42 arranged sequentially. The first side molding plate 43 and the second side molding plate 42 are respectively located directly above the R-corner areas at both ends of the battery core 1, and are used to thermoform the R-corner areas at both ends of the battery core 1. The middle molding plate 41 is located directly above the area between the two R-corners in the battery core 1, and is used to thermoform the area between the two R-corners in the battery core 1.

[0087] The segmented molding system in the above scheme can realize the segmented molding method described in any one of Embodiment 1.

[0088] The following is combined Figures 2-4 The working principle of the segmented molding system in the embodiments of the present invention will be described in detail.

[0089] like Figure 2 and Figure 3 As shown, after the battery core is wound, the first unloading needle 31 and the second unloading needle 32 open the battery core. At the same time, the first clamp 21, the second clamp 23, the third clamp 22 and the fourth clamp 24 fix the battery core respectively. After the battery core is fixed, the charge-coupled device (CCD) is used to confirm that the separator has not been folded. The height of the battery core before it is shaped (i.e., the initial height) is 60mm.

[0090] like Figure 4As shown, the battery core is transferred to the hot pressing station. The temperature of the segmented hot pressing plate 4 is set to 75℃. The middle molding plate 41 shapes the large surface of the battery core 1 with a pressure of 10t and an initial molding speed of 20mm / s. When the large surface is shaped to a height of 30mm, the molding speed is reduced to 10mm / s. At this time, the first side molding plate 43 and the second side molding plate 42 are used to shape the R-angle of the core respectively. The molding speed is 50mm / s, the initial pressing pressure is 6t, and the pressing pressure gradually decreases with the molding height. When the first side molding plate 43 and the second side molding plate 42 are at the same level as the middle molding plate 41, the pre-pressing ends, and the first clamp 21, the second clamp 23, the third clamp 22, and the fourth clamp 24 are removed. Finally, the segmented hot press plate 4 shapes the entire battery core at a molding speed of 10mm / s and a pressing pressure of 7t, with a hot pressing holding time of 40s, and the molding is completed.

[0091] In the above examples, by using a segmented hot-pressing method, the internal stress of the high-pressure solid core is gradually released during the molding process, reducing the risk of wrinkles in the negative electrode sheet and material loss and light transmission in the positive electrode sheet, thus improving the safety performance of the battery cell.

[0092] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0093] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0094] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

[0097] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A segmented molding method suitable for battery cores, characterized in that, include: The battery core is opened using a feeding and winding needle mechanism; The gripper mechanism is used to clamp the R-angles at both ends of the battery core to fix the R-angles; The battery core, along with the unloading winding mechanism and the gripper mechanism, is transferred to the hot pressing station using a transfer mechanism. The middle molding plate in the segmented hot press plate is used to perform variable speed hot pressing on the area between the two ends R angle of the battery core. The first and second side molding plates located on both sides of the middle molding plate in the segmented hot press plate are used to perform variable pressure pre-compression on the R-corner areas at both ends of the battery core. The gripper mechanism is removed, and the battery core is simultaneously subjected to secondary hot pressing using the intermediate molding plate, the first side molding plate, and the second side molding plate, thus completing the molding process.

2. The segmented molding method for battery cores according to claim 1, characterized in that, The feeding and winding needle mechanism includes a first feeding needle and a second feeding needle; the step of using the feeding and winding needle mechanism to open the battery core specifically includes: After the first and second feeding needles are inserted into the inside of the battery core, they are pressed against the R-angles at both ends of the battery core, and then the battery core is opened at a uniform speed.

3. The segmented molding method for battery cores according to claim 1, characterized in that: The gripper mechanism includes a first gripper, a second gripper, a third gripper, and a fourth gripper; the R-angles at both ends of the battery core are defined as the first R-angle and the second R-angle, respectively; The method of using a gripper mechanism to clamp the R-angles at both ends of the battery core specifically includes: The first R-angle is fixed by using the first and second grippers to clamp it. The second R-angle is fixed by using the third and fourth grippers to clamp it.

4. The segmented molding method for battery cores according to claim 1, characterized in that: The heating temperatures of the intermediate molding plate, the first side molding plate, and the second side molding plate are all the same, with a heating temperature range of 25℃ to 120℃.

5. The segmented molding method for battery cores according to claim 1, characterized in that: The intermediate molding plate experiences a downward pressure range of 5~20t during a single hot pressing process, with the molding speed gradually decreasing.

6. The segmented molding method for battery cores according to claim 1, characterized in that: When the intermediate molding plate presses down the area between the two ends of the battery core to a specified height, the first hot pressing of the intermediate molding plate ends. The specified height is 1 / 3 to 1 / 2 of the initial height of the area between the two ends of the battery core.

7. The segmented molding method for battery cores according to claim 1, characterized in that: When the first side molding plate, the second side molding plate, and the middle molding plate are on the same horizontal plane, the first side molding plate and the second side molding plate finish pre-pressing.

8. The segmented molding method for battery cores according to claim 1, characterized in that: During the pre-compression process, the downward pressure of the first and second side molding plates gradually decreases with the downward pressure height, and satisfies the following formula: f = F * (h / H) * σ; In the formula, f is the pressing pressure of the first or second side molding plate during the pre-pressing process; F is the pressing pressure of the first or second side molding plate in the initial state; h is the current pressing height of the R-corner area; H is the initial height of the R-corner area; σ is the correction coefficient, with a value range of 0 to 1.

9. A segmented molding method for battery cores according to claim 1, characterized in that: The pressing speed of the intermediate molding plate during the first hot pressing process is greater than that during the second hot pressing process; during the second hot pressing process, the pressing speeds of the first side molding plate, the intermediate molding plate, and the second side molding plate are the same, and the pressing pressure is the same.

10. A segmented molding system suitable for battery winding cores, characterized in that, include: The feeding and winding needle mechanism is used to open up the battery core; The gripper mechanism is used to clamp the R-angles at both ends of the battery core to fix the R-angles; The transfer mechanism is used to transfer the battery core together with the unloading winding mechanism and the gripper mechanism to the hot pressing station. The hot press plate includes a first side molding plate, a middle molding plate, and a second side molding plate arranged sequentially. The first side molding plate and the second side molding plate are respectively located directly above the R-corner areas at both ends of the battery core, and are used to thermoform the R-corner areas at both ends of the battery core. The middle molding plate is located directly above the area in the battery core located between the two R-corners, and is used to thermoform the area in the battery core located between the two R-corners.

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