Combined cell pole piece cooling device and pole piece production line

Abstract

The utility model discloses a combined type cell pole piece cooling device and a pole piece production line, and belongs to the technical field of lithium battery manufacturing equipment, and the combined type cell pole piece cooling device comprises a cooling roller assembly and an air cooling assembly. The cooling roller assembly comprises at least one cooling roller, the pole piece subjected to hot rolling is in contact connection with the arc surface of the outer side of the cooling roller, so that the cooling roller can cool the pole piece, and an arc wrap angle is formed between the pole piece and the cooling roller; the air cooling assembly comprises at least one cooling air knife, the cooling air knife is arranged close to the pole piece, and an air outlet of the cooling air knife faces the pole piece. A pole piece production line comprises a roller press, a thickness gauge and a combined cell pole piece cooling device, and the cooling device is located between the roller press and the thickness gauge. According to the cooling device, different assemblies can be adopted for cooling according to different production line speed conditions, cooling of the pole piece is achieved with low cost, and meanwhile the energy utilization mode is more reasonable.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing equipment, and more specifically to a combined battery cell pole piece cooling device and a pole piece production line. Background Art

[0002] With the rapid development of my country's new energy industry in recent years, lithium battery manufacturers have increased their investment in capacity improvement, and the production efficiency requirements for battery cell production lines have gradually increased. The maximum roller speed can reach about 80m / min. Rolling is an important process before the battery cell pole piece is formed. Compared with cold rollers, hot rollers can reduce pole piece rebound and enhance battery performance.

[0003] After the pole piece is rolled by the hot roller, the pole piece thickness needs to be measured in real time to detect whether the pole piece thickness meets the process standards. During hot pressing, the temperature of the main roller reaches 70-100°C, while the working temperature of the laser thickness gauge is below 40°C. If the pole piece is not cooled down after leaving the hot roller and before entering the laser thickness gauge, the pole piece temperature will be difficult to meet the working temperature of the laser thickness gauge, making it impossible to measure the pole piece thickness and making it impossible to judge the pole piece thickness.

[0004] On the other hand, on the electrode production line, the distance between the laser thickness gauge and the hot pressing roller is limited, and the production line speed is fast. After the electrode passes through the hot pressing roller, it cannot be cooled down to the temperature required by the laser thickness gauge under natural conditions. It is necessary to use an electrode cooling device to quickly cool down the electrode. Some existing electrode cooling devices have relatively single functions. When the line speed of the production line changes, it is impossible to switch to different cooling functions according to the changes in the line speed of the production line. Utility Model Content

[0005] In view of at least some problems in the prior art, the utility model provides a combined battery cell pole piece cooling device and a pole piece production line.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0007] A combined battery cell electrode cooling device, comprising:

[0008] A cooling roller assembly, comprising at least one cooling roller, wherein the pole piece after hot rolling is in contact with the outer arc surface of the cooling roller, so that the cooling roller can cool the pole piece, and an arc angle is formed between the pole piece and the cooling roller;

[0009] The air cooling component comprises at least one cooling air knife, wherein the cooling air knife is arranged close to the pole piece, and the air outlet of the cooling air knife faces the pole piece.

[0010] Furthermore, the cooling roller assembly includes a first cooling roller, a second cooling roller and a third cooling roller, and the first cooling roller, the second cooling roller and the third cooling roller are arranged in parallel and are not in the same plane.

[0011] Furthermore, a cooling pipeline is provided in the cooling roller, and the cooling pipeline is used for circulating a cooling medium.

[0012] Furthermore, the cooling air knife includes a first cooling air knife and a second cooling air knife, and the first cooling air knife and the second cooling air knife are respectively located on both sides of the pole piece.

[0013] Furthermore, the cooling air knife includes an air inlet and an air outlet, and the cooling air enters through the air inlet and is blown out through the air outlet.

[0014] Furthermore, the air outlet is in an elongated strip shape and extends in a width direction of the pole piece.

[0015] Furthermore, the cooling roller is connected to the driving assembly via a transmission belt.

[0016] Furthermore, a tensioning shaft is arranged on one side of the conveyor belt, and the tensioning shaft is used to compress the conveyor belt.

[0017] Furthermore, both ends of the cooling roller and the cooling air knife are respectively connected to the frame.

[0018] The utility model also provides a pole piece production line, comprising a roller press, a thickness gauge and the combined battery core pole piece cooling device, wherein the cooling device is located between the roller press and the thickness gauge;

[0019] After being hot rolled by the roller press, the pole piece enters the cooling device for cooling, and the pole piece after cooling enters the thickness gauge for thickness measurement.

[0020] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0021] (1) The utility model discloses a combined battery cell electrode cooling device, comprising a cooling roller assembly and an air cooling assembly. The cooling roller assembly directly contacts the electrode for cooling, and the air cooling assembly cools the electrode by outputting cooling air toward the electrode. Different assemblies can be used for cooling according to different electrode production speeds, thereby achieving electrode cooling at a relatively low cost and making energy utilization more reasonable.

[0022] (2) The utility model provides a combined battery cell electrode cooling device, wherein the cooling rollers include a first cooling roller, a second cooling roller and a third cooling roller, and the first cooling roller, the second cooling roller and the third cooling roller are arranged in parallel and are not in the same plane, so that the wrap angle between each cooling roller and the electrode is increased, thereby increasing the contact area between the electrode and each cooling roller, and improving the cooling effect of the cooling roller on the electrode.

[0023] (3) The utility model provides a combined battery cell electrode cooling device, wherein the cooling air knife includes a first cooling air knife and a second cooling air knife. The first cooling air knife and the second cooling air knife are respectively located on both sides of the electrode. Both sides of the electrode are cooled by cooling air, so that the heat is evenly dissipated on both sides of the electrode.

[0024] (4) The utility model provides an electrode production line which adopts a combined battery cell electrode cooling device, which can effectively cool the electrode so that the electrode temperature reaches the temperature required by the thickness gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the cooling device;

[0026] Figure 2 for Figure 4 Schematic diagram of the cross section of the cooling device at AA;

[0027] Figure 3 It is a schematic diagram of the cooling air knife structure;

[0028] Figure 4 This is a schematic diagram of the electrode production line layout.

[0029] Description of labels:

[0030] 100, cooling device; 200, roller press; 300, thickness gauge; 400, cooling water system; 500, air source system;

[0031] 1. Frame; 2. Pole piece; 3. Roller; 41. First cooling roller; 42. Second cooling roller; 43. Third cooling roller; 51. First cooling air knife; 511. Air inlet; 512. Air outlet; 52. Second cooling air knife; 6. Conveyor belt; 7. Drive assembly; 8. Rotating connector; 9. Tensioning shaft. DETAILED DESCRIPTION

[0032] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0033] The structures, proportions, sizes, etc. illustrated in the drawings of the present utility model are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the limiting conditions that can be implemented in the present utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present utility model without affecting the effects that can be produced by the present utility model and the purposes that can be achieved. The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described here.

[0034] In the present application, the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements, or components to a specific orientation, or to be constructed and operated in a specific orientation. Moreover, in addition to being used to indicate orientations or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the present application may be understood based on the specific circumstances.

[0035] Combination Figure 1 and Figure 2 As shown, this embodiment provides a combined battery cell pole piece cooling device 100, including a cooling roller assembly and an air cooling assembly, both of which can cool the pole piece 2.

[0036] The cooling roller assembly includes three cooling rollers, namely the first cooling roller 41, the second cooling roller 42 and the third cooling roller 43. It should be noted that in other embodiments, other numbers of cooling rollers can also be provided according to cooling needs. In this embodiment, the pole piece 2 after hot rolling is in contact with the outer arc surface of the cooling roller, so that the cooling roller can cool the pole piece 2, and an arc wrap angle is formed between the pole piece 2 and the cooling roller after contact. The arc wrap angle refers to the center angle of the contact arc between the pole piece 2 and the cooling roller. The larger the wrap angle, the longer the contact arc between the pole piece 2 and the cooling roller, and the larger the contact area; the smaller the wrap angle, the shorter the contact arc between the pole piece 2 and the cooling roller, and the smaller the contact area.

[0037] The cooling roller has a cooling pipeline inside, and the cooling pipeline is used to circulate the cooling medium. The arrangement of the cooling pipeline can be any existing method, and no specific description is given. It should be noted that when the cooling roller rotates with the pole piece 2, the cooling pipeline does not rotate with the cooling roller. The cooling medium in this embodiment is cooling water, and the cooling water is input through the cooling water system 400. In other embodiments, the cooling medium may also be cold air, or other cooling liquids.

[0038] In this embodiment, the first cooling roller 41, the second cooling roller 42 and the third cooling roller 43 are arranged in parallel and are not in the same plane. Specifically, the first cooling roller 41, the second cooling roller 42 and the third cooling roller 43 are arranged parallel to the width direction of the pole piece 2, and the ends of the first cooling roller 41, the second cooling roller 42 and the third cooling roller 43 are not located on the same straight line, and the first cooling roller 41, the second cooling roller 42 and the third cooling roller 43 are not in the same plane. See Figure 1 In the process, after the pole piece 2 passes through the first cooling roller 41, it passes between the first cooling roller 41 and the second cooling roller 42, and then contacts and connects with the third cooling roller 43 after passing through the second cooling roller 42, passes between the third cooling roller 43 and the over roller 3, and finally enters the next process after passing through the roller 3. The arrangement of the first cooling roller 41, the second cooling roller 42 and the third cooling roller 43 and the path of the pole piece 2 can increase the wrap angle between the cooling roller and the pole piece 2, thereby increasing the contact area between the pole piece 2 and each cooling roller, and improving the cooling effect of the cooling roller on the pole piece 2.

[0039] Both ends of the cooling roller and the passing roller 3 are mounted on the frame 1 .

[0040] Furthermore, the cooling roller is connected to the driving assembly 7 through the conveyor belt 6, and the driving assembly 7 is a servo motor. One end of the cooling roller passes through the frame 1 and is connected to the rotating connector 8. The conveyor belt 6 is wound around each rotating connector 8 and connected to the power output end of the driving assembly 7, so that the driving assembly 7 can drive each cooling roller to rotate. A tensioning shaft 9 is also provided on one side of the conveyor belt 6, and the tensioning shaft 9 is used to press the conveyor belt 6 to put the conveyor belt 6 in a tensioned state.

[0041] The air cooling assembly in this embodiment includes two cooling air knives, which are arranged close to the pole piece 2, and the air outlet 512 of the cooling air knife faces the pole piece 2, and the cooling air blown out through the air outlet 512 cools the pole piece 2. In other embodiments, other numbers of cooling air knives can also be set, depending on the cooling requirements of the pole piece 2.

[0042] Specifically in this embodiment, the cooling air knife includes a first cooling air knife 51 and a second cooling air knife 52, and the first cooling air knife 51 and the second cooling air knife 52 are respectively located on both sides of the pole piece 2, and both sides of the pole piece 2 are cooled by cooling air, so that the two side surfaces of the pole piece 2 dissipate heat evenly.

[0043] Furthermore, if Figure 3 As shown, the cooling air knife includes an air inlet 511 and an air outlet 512. In this embodiment, a plurality of air inlets 511 are provided, and the air outlet 512 is in a long strip shape and extends in the width direction of the pole piece 2. The cooling air enters through the air inlet 511 and is blown out through the air outlet 512. The plurality of air inlets 511 can provide sufficient air source for the cooling air knife, so that the air outlet 512 can blow out strong wind force, thereby improving the cooling effect on the pole piece 2.

[0044] Both ends of the cooling air knife are connected to the frame 1.

[0045] like Figure 4 As shown, the utility model also provides a pole piece production line including a roller press 200, a thickness gauge 300 and the above-mentioned combined battery cell pole piece cooling device 100, wherein the cooling device 100 is located between the roller press 200 and the thickness gauge 300. After being hot rolled by the roller press 200, the pole piece 2 enters the cooling device 100 for cooling, and the pole piece 2 after cooling enters the thickness gauge 300 for thickness measurement.

[0046] The electrode production line also includes a cooling water system 400 and an air source system 500, wherein the cooling water system 400 is connected to the cooling pipeline in the cooling roller to provide cooling water for the cooling roller; the air source system 500 is connected to the air inlet 511 of the cooling air knife to provide cooling air for the cooling air knife.

[0047] The electrode production line in this embodiment adopts a combined battery cell electrode cooling device 100, which includes a cooling roller assembly and an air cooling assembly. Different assemblies can be used for cooling according to different electrode production line speeds, effectively avoiding overcooling or insufficient cooling.

[0048] In a specific case, when the production speed is 20-30m / min and the temperature of the hot pressing roller in the roller press 200 is about 70°C, the air cooling component can meet the cooling requirements; when the production speed is 30-50m / min and the temperature of the hot pressing roller is 80-90°C, the cooling roller component is used for cooling, and the input of cooling water at about 16°C can achieve effective cooling; when the production speed is 50-80m / min and the temperature of the hot pressing roller is about 100°C, the cooling roller component and the air cooling component are used in combination, and the cooling roller component and the input of cooling water at 5-8°C can meet the cooling requirements. The cooling device 100 can use different components for cooling according to different production line speeds, achieve cooling of the pole piece at a relatively low cost, and make the energy utilization method more reasonable.

[0049] The terms "installed", "set", "provided with", and "connected" referred to herein should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A combined battery cell electrode cooling device, characterized in that: include: A cooling roller assembly, comprising at least one cooling roller, wherein the pole piece (2) after hot rolling is in contact with the outer arc surface of the cooling roller, so that the cooling roller can cool the pole piece (2), and an arc angle is formed between the pole piece (2) and the cooling roller; The air cooling component comprises at least one cooling air knife, wherein the cooling air knife is arranged close to the pole piece (2), and the air outlet (512) of the cooling air knife faces the pole piece (2).

2. The combined battery cell electrode cooling device according to claim 1, characterized in that: The cooling roller assembly comprises a first cooling roller (41), a second cooling roller (42) and a third cooling roller (43), wherein the first cooling roller (41), the second cooling roller (42) and the third cooling roller (43) are arranged in parallel and are not in the same plane.

3. The combined battery cell electrode cooling device according to claim 1, characterized in that: The cooling roller has a cooling pipeline inside, and the cooling pipeline is used for circulating a cooling medium.

4. The combined battery cell electrode cooling device according to claim 1 or 2, characterized in that: The cooling air knife comprises a first cooling air knife (51) and a second cooling air knife (52), and the first cooling air knife (51) and the second cooling air knife (52) are respectively located on both sides of the pole piece (2).

5. The combined battery cell electrode cooling device according to claim 4, characterized in that: The cooling air knife comprises an air inlet (511) and an air outlet (512); the cooling air enters through the air inlet (511) and is blown out through the air outlet (512).

6. The combined battery cell electrode cooling device according to claim 5, characterized in that: The air outlet (512) is in the shape of an elongated strip and extends in the width direction of the pole piece (2).

7. The combined battery cell electrode cooling device according to claim 1, characterized in that: The cooling roller is connected to a driving assembly (7) via a transmission belt (6).

8. The combined battery cell electrode cooling device according to claim 7, characterized in that: A tensioning shaft (9) is arranged on one side of the conveyor belt (6), and the tensioning shaft (9) is used to press the conveyor belt (6).

9. The combined battery cell electrode cooling device according to claim 1, characterized in that: The two ends of the cooling roller and the cooling air knife are respectively connected to the frame (1).

10. A pole piece production line, characterized in that: It comprises a roller press (200), a thickness gauge (300), and the combined battery cell electrode sheet cooling device (100) according to any one of claims 1 to 9, wherein the cooling device (100) is located between the roller press (200) and the thickness gauge (300); After being hot-rolled by the roller press (200), the pole piece (2) enters the cooling device (100) for cooling, and after cooling, the pole piece (2) enters the thickness gauge (300) for thickness measurement.

Images