Three-phase balanced heating panel

Abstract

The present application belongs to the technical field of lithium electronic battery, and particularly relates to a three-phase balanced heating plate. The three-phase balanced heating plate comprises a substrate and an electric heating element, the electric heating element comprises first, second and third heating elements with the same power and spaced from each other; at least two of the first, second and third heating elements are attached to the side of the thickness direction of the substrate; the first heating element leads out a first A-phase electrode and a first B-phase electrode, the third heating element leads out a second A-phase electrode and a first C-phase electrode, the second heating element leads out a second B-phase electrode and a second C-phase electrode, the second B-phase electrode is electrically connected with the first B-phase electrode, and the second C-phase electrode is electrically connected with the first C-phase electrode; the first A-phase electrode and the second A-phase electrode are electrically connected with the A-phase of a three-phase power supply, the first B-phase electrode is electrically connected with the B-phase of the three-phase power supply, and the first C-phase electrode is electrically connected with the C-phase of the three-phase power supply. The device can realize three-phase balance without being a multiple of three.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology, and in particular relates to a three-phase balanced heating plate. Background Technology

[0002] In the manufacturing process of lithium-ion battery electrodes, the mainstream processes currently include wet material preparation, coating, and baking. Among these, the baking process mainly uses coating ovens. Some ovens dry the electrodes with hot air, but this method has low energy efficiency, low baking rate, and poor electrode quality. Other ovens use a combination of hot air drying and infrared radiation heating. This drying method, compared to simply using hot air drying, can improve the baking rate and electrode quality to some extent.

[0003] Current infrared solutions primarily use infrared lamps as the infrared source for baking. Coating machines require a large number of these lamps, which have short lifespans, high temperatures, and necessitate additional cooling and temperature monitoring devices, resulting in high costs. The latest solution, infrared plates, utilizes plate-shaped infrared sources. Compared to lamps, this approach is lower in cost, has a longer lifespan, and generates lower temperatures, making it a technology that is increasingly attracting industry attention.

[0004] However, heating plates have a certain width compared to infrared lamps, which may lead to situations where only five, seven, or other non-integer multiples of three can be installed in a single oven section during installation and modification. This can result in the inability to achieve three-phase balance and affect the power output and operational stability of the heating plates. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in the prior art, when heating plates that are not multiples of three are installed in the oven, it is impossible to achieve three-phase balance, and the power output and working stability of the heating plates are affected. The present invention provides a three-phase balanced heating plate.

[0006] To solve the above-mentioned technical problems, on the one hand, the present invention provides a three-phase balanced heating plate, including a substrate and heating elements, wherein the heating elements include a first heating element, a second heating element and a third heating element with the same power and spaced apart from each other; at least two of the first heating element, the second heating element and the third heating element are attached to one side surface of the substrate in the thickness direction.

[0007] The first heating element leads out a first A-phase electrode and a first B-phase electrode, the third heating element leads out a second A-phase electrode and a first C-phase electrode, the second heating element leads out a second B-phase electrode and a second C-phase electrode, the second B-phase electrode is electrically connected to the first B-phase electrode, and the second C-phase electrode is electrically connected to the first C-phase electrode.

[0008] The first phase A electrode and the second phase A electrode are used to electrically connect to phase A of the three-phase power supply, the first phase B electrode is used to electrically connect to phase B of the three-phase power supply, and the first phase C electrode is used to electrically connect to phase C of the three-phase power supply.

[0009] Optionally, the first heating element and the third heating element are spaced apart on the substrate along a first direction, and the second heating element is disposed outside the substrate; the second heating element includes a first heater and a second heater connected in series, the first heater and the third heating element are spaced apart along a second direction, and the second heater and the first heating element are spaced apart along a second direction, and the first direction and the second direction do not coincide.

[0010] Optionally, the first heating element, the second heating element, and the third heating element are sequentially spaced apart on the substrate along the first direction.

[0011] Optionally, the second C-phase electrode is electrically connected to the first C-phase electrode through the third heating element, and the second B-phase electrode is electrically connected to the first B-phase electrode through the first heating element.

[0012] Optionally, the size ratio of the first heating element, the second heating element, and the third heating element along the first direction is a:b:a, and b is greater than or equal to a.

[0013] Optionally, the first heating element includes a first sub-heating element and a second sub-heating element connected together, the power of the first sub-heating element being greater than the power of the second sub-heating element, and the side of the first sub-heating element away from the second heating element being connected to the second sub-heating element; the third heating element includes a third sub-heating element and a fourth sub-heating element connected together, the power of the third sub-heating element being greater than the power of the fourth sub-heating element, and the side of the third sub-heating element away from the second heating element being connected to the second sub-heating element, and b being greater than a.

[0014] Optionally, the first heating element includes a third heater and a fifth sub-heating element connected in series, the third heating element includes a fourth heater and a sixth sub-heating element connected in series, the fifth sub-heating element, the second heating element, and the sixth sub-heating element are spaced apart along a first direction, the third heater, the substrate, and the fourth heater are spaced apart along a second direction, and b is greater than a.

[0015] Optionally, the first heating element, the second heating element, and the third heating element have the same dimensions along the second direction.

[0016] Optionally, it also includes a cover plate that can be detachably fitted onto the substrate.

[0017] According to the three-phase balanced heating plate of this embodiment, three-phase balance can be achieved internally. When applied to oven baking, even if the number of three-phase balanced heating plates is not a multiple of three, it can still be installed and used without worrying about three-phase balance issues, thereby ensuring power output and operational stability.

[0018] On the other hand, embodiments of the present invention also provide another three-phase balanced heating plate, including a substrate and heating elements, wherein the heating elements include a first heating element, a second heating element and a third heating element with the same power and spaced apart from each other; at least two of the first heating element, the second heating element and the third heating element are attached to one side surface of the substrate in the thickness direction.

[0019] The first heating element leads out an A-phase electrode and a first neutral line, the second heating element leads out a B-phase electrode and a second neutral line, and the third heating element leads out a C-phase electrode and a third neutral line. The first neutral line, the second neutral line, and the third neutral line are electrically connected and form a node.

[0020] The A-phase electrode is used to electrically connect to the A-phase of the three-phase power supply, the B-phase electrode is used to electrically connect to the B-phase of the three-phase power supply, and the C-phase electrode is used to electrically connect to the C-phase of the three-phase power supply. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the three-phase balanced heating plate provided in Embodiment 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the electrode sheet with an intermittent coating area in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the three-phase balanced heating plate provided in Embodiment 2 of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the three-phase balanced heating plate provided in Embodiment 3 of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the three-phase balanced heating plate provided in Embodiment 4 of the present invention;

[0026] Figure 6 This is a schematic diagram of the circuit connection between the three-phase balanced heating plate and the three-phase power supply provided in Embodiments 1 to 4 of the present invention;

[0027] Figure 7 This is a circuit connection diagram of the three-phase balanced heating plate and the three-phase power supply provided in Embodiments 1 to 5 of the present invention.

[0028] The reference numerals in the accompanying drawings are as follows:

[0029] 1. Substrate; 2. Heating element; 3. First A-phase electrode; 4. First B-phase electrode; 5. Second A-phase electrode; 6. First C-phase electrode; 7. Second B-phase electrode; 8. Second C-phase electrode; 11. Electrode; 12. First coating area; 13. Second coating area; 14. Gap; 21. First heating element; 22. Second heating element; 23. Third heating element; 211. First sub-heating element; 212. Second sub-heating element; 213. Third heater; 214. Fifth sub-heating element; 221. First heater; 222. Second heater; 231. Third sub-heating element; 232. Fourth sub-heating element; 233. Fourth heater; 234. Sixth sub-heating element. Detailed Implementation

[0030] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a three-phase balanced heating plate, including a substrate 1 and an electric heating element 2. The electric heating element 2 includes a first heating element 21, a second heating element 22 and a third heating element 23 with the same power and spaced apart from each other; at least two of the first heating element 21, the second heating element 22 and the third heating element 23 are attached to one side surface of the substrate 1 in the thickness direction.

[0033] The first heating element 21 leads out the first A-phase electrode 3 and the first B-phase electrode 4, the third heating element 23 leads out the second A-phase electrode 5 and the first C-phase electrode 6, the second heating element 22 leads out the second B-phase electrode 7 and the second C-phase electrode 8, the second B-phase electrode 7 is electrically connected to the first B-phase electrode 4, and the second C-phase electrode 8 is electrically connected to the first C-phase electrode 6.

[0034] The first A-phase electrode 3 and the second A-phase electrode 5 are used to electrically connect to phase A of the three-phase power supply, the first B-phase electrode 4 is used to electrically connect to phase B of the three-phase power supply, and the first C-phase electrode 6 is used to electrically connect to phase C of the three-phase power supply. In this embodiment, the material of the substrate 1 includes, but is not limited to, microcrystalline glass, quartz glass, etc. The material of the electrodes includes, but is not limited to, sintered silver paste, sintered silver-palladium paste, sintered palladium paste, sintered rhodium paste, etc. The material of the heating element includes, but is not limited to, graphene, carbon nanotubes, carbon black, carbon fiber, tin oxide, tin-antimony oxide, indium oxide, indium tin oxide, etc. For ease of understanding, in the accompanying drawings, the electrode or heating tube used for connection to phase A of the three-phase power supply is marked with A, the electrode used for connection to phase B of the three-phase power supply is marked with B, and the electrode used for connection to phase C of the three-phase power supply is marked with C. Simultaneously, the three phases led out from the three-phase power supply are also marked with A, B, and C.

[0035] In this embodiment, the first heating element 21 and the third heating element 23 are spaced apart on the substrate 1 along a first direction, and the second heating element 22 is disposed outside the substrate 1. The second heating element 22 includes a first heater 221 and a second heater 222 connected in series. The first heater 221 and the third heating element 23 are spaced apart along a second direction, and the second heater 222 and the first heating element are spaced apart along the second direction. The first direction and the second direction do not coincide. In this embodiment, the substrate 1 is 1m long, the first heating element 21 and the third heating element 23 are both 40cm long, and the second heating element 22 consists of two heating tubes connected in series. The first heating element 21, the second heating element 22, and the third heating element 23 have the same power. When the heating plate is working, this type of heating plate is suitable for intermittent coating, which is a commonly used coating method in the lithium battery industry. The substrates used for coating in the lithium battery industry are aluminum foil and copper foil. If an intermittent coating is performed using a front-side heating plate, wrinkles will appear in the intermittent areas, affecting subsequent use. Using a zoned heating plate can solve the problem of wrinkles in the intermittent areas. In this embodiment, the first direction is the length direction of the substrate 1, and the second direction is the width direction of the substrate 1. In the accompanying drawings, left and right represent the length direction, and up and down represent the width direction. The first direction is perpendicular to the second direction; however, the case where the first direction is not perpendicular to the second direction is also within the scope of protection of this embodiment. Furthermore, the dimensions of the first heating element 21 and the second heater 222 in the first direction are preferably the same, and the dimensions of the third heating element 23 and the first heater 221 in the first direction are preferably the same. This allows the device to better heat the spaced-coated electrode sheets 11. Additionally, the case where the first heating element 21 and the second heating element 22 are disposed on the substrate 1, and the third heating element 23 is disposed outside the substrate 1, is also within the scope of protection of this embodiment. Alternatively, the case where the second heating element 22 and the third heating element 23 are disposed on the substrate 1, and the first heating element 21 is disposed outside the substrate 1, is also within the scope of protection of this embodiment.

[0036] Example 2

[0037] Similar to Example 1, such as Figure 3 As shown, in this embodiment, the first heating element 21, the second heating element 22, and the third heating element 23 are sequentially spaced on the substrate 1 along the first direction.

[0038] In this embodiment, the second C-phase electrode 8 is electrically connected to the first C-phase electrode 6 via the third heating element 23, and the second B-phase electrode 7 is electrically connected to the first B-phase electrode 4 via the first heating element 21. In this embodiment, the second C-phase electrode 8 is connected between the third heating element 23 and the second heating element 22, and the second B-phase electrode 7 is connected between the first heating element 21 and the second heating element 22.

[0039] In addition, the size ratio of the first heating element 21, the second heating element 22, and the third heating element 23 along the first direction is a:b:a, and b is greater than or equal to a.

[0040] The first heating element 21 includes a first sub-heating element 211 and a second sub-heating element 212 connected together. The power of the first sub-heating element 211 is greater than the power of the second sub-heating element 212. The side of the first sub-heating element 211 away from the second heating element 22 is connected to the second sub-heating element 212. The third heating element 23 includes a third sub-heating element 231 and a fourth sub-heating element 232 connected together. The power of the third sub-heating element 231 is greater than the power of the fourth sub-heating element 232. The side of the third sub-heating element 231 away from the second heating element 22 is connected to the second sub-heating element 212, and b is greater than a. In this embodiment, the total length of the substrate 1 is 1.2m. The length ratio of the first heating element 21, the second heating element 22, and the third heating element 23 is 3:4:3. The first heating element 21, the second heating element 22, and the third heating element 23 have the same power. The difference in power between the first sub-heating element 211 and the second sub-heating element 212, and between the third sub-heating element 231 and the fourth sub-heating element 232, is achieved by printing a highly conductive paste. In this embodiment, the first heating element 21 and the third heating element 23 are printed with highly conductive paste at their edge positions, while the other areas are printed with the same paste. When the heating plate is working, the edge areas on both sides of the heating plate have a higher heating temperature, which can compensate for the situation where the edge areas lose heat too quickly and have a low temperature during use.

[0041] Furthermore, the first heating element 21, the second heating element 22, and the third heating element 23 have the same dimensions along the second direction. In this embodiment, the first heating element 21, the second heating element 22, and the third heating element 23 have the same dimensions in the width direction. Of course, the situation where the first heating element 21, the second heating element 22, and the third heating element 23 have different dimensions in the width direction is also within the scope of protection of this embodiment.

[0042] Additionally, a cover plate is included, which can be detachably attached to the substrate 1. This protects the substrate 1 and the components on it from external damage.

[0043] Example 3

[0044] Similar to Example 2, such as Figure 4 As shown, in this embodiment, the first heating element 21 includes a third heater 213 and a fifth sub-heating element 214 connected in series; the third heating element 23 includes a fourth heater 233 and a sixth sub-heating element 234 connected in series; the fifth sub-heating element 214, the second heating element 22, and the sixth sub-heating element 234 are spaced apart along a first direction, and the third heater 213, the substrate 1, and the fourth heater 233 are spaced apart along a second direction, where b is greater than a. In this embodiment, the total length of the substrate 1 is 1.4m, the length ratio of the first heating element 21, the second heating element 22, and the third heating element 23 is 2:6:2, the conductive paste of the fifth sub-heating element 214, the second heating element 22, and the sixth sub-heating element 234 is the same, but the fifth sub-heating element 214 and the sixth sub-heating element 234 are each connected in series with a metal heating tube, and the power of the third heater 213 plus the fifth sub-heating element 214 and the fourth heater 233 plus the sixth sub-heating element 234 is the same as the power of the second heating element 22. This heating module, which combines a heating element and a heating plate, can provide both medium- and long-wave infrared radiation and short-wave infrared radiation, resulting in better infrared baking effects.

[0045] Example 4

[0046] Similar to Example 2, such as Figure 5 and Figure 6 As shown, in this embodiment, b equals a. In this embodiment, the total length of the substrate 1 is 1.4m, the length ratio of the first heating element 21, the second heating element 22, and the third heating element 23 is 1:1:1, the conductive paste of the first heating element 21, the second heating element 22, and the third heating element 23 is the same, the power is the same, and the operating temperature is the same.

[0047] Example 5

[0048] In addition, the present invention also provides another three-phase balanced heating plate, such as Figure 7 As shown, the device includes a substrate 1 and an electric heating element 2. The electric heating element 2 includes a first heating element 21, a second heating element 22 and a third heating element 23 with the same power and spaced apart from each other. At least two of the first heating element 21, the second heating element 22 and the third heating element 23 are attached to one side surface of the substrate 1 in the thickness direction.

[0049] The first heating element 21 leads out the A-phase electrode and the first neutral line, the second heating element 22 leads out the B-phase electrode and the second neutral line, and the third heating element 23 leads out the C-phase electrode and the third neutral line. The first neutral line, the second neutral line, and the third neutral line are electrically connected and form a node.

[0050] Phase A electrode is used to electrically connect to phase A of the three-phase power supply, phase B electrode is used to electrically connect to phase B of the three-phase power supply, and phase C electrode is used to electrically connect to phase C of the three-phase power supply.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-phase balanced heating plate, characterized in that, The device includes a substrate and heating elements, wherein the heating elements include a first heating element, a second heating element, and a third heating element that have the same power and are spaced apart from each other; at least two of the first heating element, the second heating element, and the third heating element are attached to one side surface of the substrate in the thickness direction. The first heating element leads out a first A-phase electrode and a first B-phase electrode, the third heating element leads out a second A-phase electrode and a first C-phase electrode, the second heating element leads out a second B-phase electrode and a second C-phase electrode, the second B-phase electrode is electrically connected to the first B-phase electrode, and the second C-phase electrode is electrically connected to the first C-phase electrode. The first A-phase electrode and the second A-phase electrode are used to electrically connect to the A phase of the three-phase power supply, the first B-phase electrode is used to electrically connect to the B phase of the three-phase power supply, and the first C-phase electrode is used to electrically connect to the C phase of the three-phase power supply. The first heating element, the second heating element, and the third heating element are sequentially and spaced apart on the substrate along a first direction; The second C-phase electrode is electrically connected to the first C-phase electrode through the third heating element, and the second B-phase electrode is electrically connected to the first B-phase electrode through the first heating element; The size ratio of the first heating element, the second heating element, and the third heating element along the first direction is a:b:a, and b is greater than or equal to a; The first heating element includes a first sub-heating element and a second sub-heating element connected together. The power of the first sub-heating element is greater than the power of the second sub-heating element. The side of the first sub-heating element away from the second heating element is connected to the second sub-heating element. The third heating element includes a third sub-heating element and a fourth sub-heating element connected together. The power of the third sub-heating element is greater than the power of the fourth sub-heating element. The side of the third sub-heating element away from the second heating element is connected to the second sub-heating element, and b is greater than a.

2. The three-phase balanced heating plate according to claim 1, characterized in that, The first heating element includes a third heater and a fifth sub-heating element connected in series. The third heating element includes a fourth heater and a sixth sub-heating element connected in series. The fifth sub-heating element, the second heating element, and the sixth sub-heating element are spaced apart along a first direction. The third heater, the substrate, and the fourth heater are spaced apart along a second direction, and b is greater than a.

3. The three-phase balanced heating plate according to claim 1, characterized in that, The first heating element, the second heating element, and the third heating element have the same dimensions along the second direction.

4. The three-phase balanced heating plate according to claim 1, characterized in that, It also includes a cover plate that can be detachably fitted onto the substrate.

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