Temperature control device of wind power variable pitch battery

Abstract

The utility model belongs to the technical field of battery temperature control, and discloses a temperature control device of a wind power variable pitch battery, which comprises a heating film contacted with a lithium battery, and the heating film is connected with a temperature control switch and a temperature control loop; the heating film comprises an outer wrapping film, two inner stranded wires and a separation film, the number of the inner stranded wires is two, the two inner stranded wires are both located in the outer wrapping film, the single section structure of each inner stranded wire is in an S shape, and the inner stranded wires comprise the positive S-shaped inner stranded wires and the reverse S-shaped inner stranded wires. A wiring mode that the two inner stranded wires are mutually staggered is adopted, the structure enables the relative positions of the two inner stranded wires to change continuously, the opportunity that the wires cut magnetic induction lines is reduced, and therefore the eddy current effect is reduced, the eddy current effect can cause energy loss and heating, the stranding structure of the double inner stranded wires is beneficial to reducing the effect, and the energy consumption is reduced. The eddy current effect and the electromagnetic interference intensity of the heating film are reduced, and the misoperation of the lithium battery protection plate is eliminated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery temperature control technical field, specifically relates to a temperature control device of wind power variable pitch battery. BACKGROUND

[0002] The wind power variable pitch battery is a special battery applied to a wind power variable pitch system. The main function thereof is to provide a backup power supply for the variable pitch system of the wind turbine when the power supply of the power grid is abnormal or fails, so as to ensure that the blades can be quickly adjusted to a safe position and air brake is realized to avoid damage of the wind turbine due to over-speed operation. The battery has the characteristics of high safety, long cycle life, superior charge-discharge performance and low self-discharge rate, and can ensure reliable operation in an emergency and improve the stability and safety of the wind power generation system.

[0003] At present, the heating scheme for the battery in the wind power variable pitch system is a heating control mode of a printed graphene carbon crystal heating film. The heating control mode is a thermal protector (thermal circuit breaker). However, the printed heating film used in the scheme has eddy current and electromagnetic interference, which can easily cause misoperation of the lithium battery protection plate.

[0004] The temperature control mode used is external environment temperature control, and a normally closed thermal protector with a temperature of 45 DEG C to 60 DEG C is installed inside. The temperature control precision of the lithium battery inside is poor, which can easily cause insufficient heating and excessive heating, and reduce the service life of the battery.

[0005] Therefore, how to solve the eddy current effect of the heating film and reduce the misoperation of the lithium battery protection plate is a technical problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0006] In view of the problems in the above background technology, the utility model aims to provide a temperature control device of wind power variable pitch battery.

[0007] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0008] A temperature control device of wind power variable pitch battery, which comprises a heating film in contact with a lithium battery, wherein the heating film is connected with a temperature control switch and a temperature control loop.

[0009] The heating film comprises an outer film, an inner wire and a separation film. The inner wire has two roots, and the two roots of the inner wire are located inside the outer film. The single segment structure of the inner wire is S-shaped. The two roots of the inner wire are installed on the two sides of the separation film. The inner wire comprises a positive S-shaped inner wire and a reverse S-shaped inner wire.

[0010] Further limited, the temperature control circuit is connected with an NTC temperature sensing element, such design, the NTC temperature sensing element is installed in the space of the lithium battery, can feedback the current temperature of the lithium battery in real time, control the opening and closing of the heating circuit, improve the heating precision, and increase the reliability of the heating circuit.

[0011] Further limited, the heating film has two, one of the heating film only includes the outer film and the positive S-shaped inner twisted wire, and the other heating film only includes the outer film and the reverse S-shaped inner twisted wire, the design, the two heating films are not staggered and perfectly combined together, so that the double twisted wire purpose is realized, the opportunity of cutting the magnetic induction line of the wire is reduced, thereby the generation of eddy current effect is reduced, the appearance after combination is good, and the position is easy to determine.

[0012] Further limited, the heating film has two, one of the heating film only includes the outer film and the positive S-shaped inner twisted wire, and the other heating film only includes the outer film and the reverse S-shaped inner twisted wire, the design, the two heating films are not staggered and perfectly combined together, so that the double twisted wire purpose is realized, the opportunity of cutting the magnetic induction line of the wire is reduced, thereby the generation of eddy current effect is reduced, the appearance after combination is good, and the position is easy to determine.

[0013] Further limited, the heating film has two, one of the heating film only includes the outer film and the positive S-shaped inner twisted wire, and the other heating film only includes the outer film and the reverse S-shaped inner twisted wire, the design, the two heating films are not staggered and perfectly combined together, so that the double twisted wire purpose is realized, the opportunity of cutting the magnetic induction line of the wire is reduced, thereby the generation of eddy current effect is reduced, the appearance after combination is good, and the position is easy to determine.

[0014] The beneficial effects of the utility model are as follows:

[0015] The utility model discloses a new heating film, adopts the wiring mode of two inner twisted wires interlaced with each other, and the structure makes the relative position between the two inner twisted wires change constantly, reduces the opportunity of cutting the magnetic induction line of the wire, thereby reduces the generation of eddy current effect, the eddy current effect can lead to energy loss and heating, and the twisted structure of double inner twisted wires helps to reduce the effect, reduces the eddy current effect and electromagnetic interference intensity of the heating film, and eliminates the misoperation of the lithium battery protection plate.

[0016] The utility model discloses the structure of double inner twisted wires makes the polarity of induced voltage opposite in part, makes the induced current on each wire offset each other, thereby reduces the influence of electromagnetic interference. DRAWINGS

[0017] The utility model can be further illustrated by the non-limiting embodiment shown in the drawings.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the temperature control device for a wind power pitch battery according to the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure;

[0020] Figure 3 for Figure 1 A schematic diagram of the positional structure when using one positive S-shaped inner twisted wire and one negative S-shaped inner twisted wire;

[0021] Figure 4 This is a schematic diagram of the structure of a temperature control device for a wind turbine pitch battery according to an embodiment of the present invention, when two heating films are bonded together.

[0022] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure;

[0023] Figure 6 This is a schematic diagram of the positional structure of a temperature control device for a wind turbine pitch battery according to an embodiment of the present invention when using two positive S-shaped inner stranded wires.

[0024] Figure 7 This is a schematic diagram of the positional structure of a temperature control device for a wind turbine pitch battery according to an embodiment of the present invention when using two inverted S-shaped inner stranded wires.

[0025] Figure 8 This is a schematic block diagram of the circuit connection of an embodiment of the temperature control device for a wind turbine pitch battery according to the present invention.

[0026] The symbols for the main components are explained below:

[0027] 1. Lithium battery; 2. Heating film; 3. Temperature control switch; 4. Temperature control circuit;

[0028] 21. Outer membrane; 22. Inner stranded wire; 23. Separator membrane; 41. NTC temperature sensing element;

[0029] 221 with positive S-shaped inner twisted wire; 222 with reverse S-shaped inner twisted wire. Detailed Implementation

[0030] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Example 1:

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 8As shown, the present invention provides a temperature control device for a wind turbine pitch battery, which includes a heating film 2 in contact with a lithium battery 1, and the heating film 2 is connected to a temperature control switch 3 and a temperature control circuit 4.

[0033] The heating film 2 includes an outer film 21, inner stranded wires 22 and a separator film 23. There are two inner stranded wires 22, both of which are located inside the outer film 21. The single-segment structure of the inner stranded wire 22 is S-shaped. The two inner stranded wires 22 are installed on both sides of the separator film 23. The inner stranded wires 22 include a positive S-shaped inner stranded wire 221 and a reverse S-shaped inner stranded wire 222.

[0034] In this embodiment, a separator 23, an outer sheath 21, a positive S-shaped inner twisted wire 221, and a negative S-shaped inner twisted wire are used. In this state, the separator 23 serves to isolate the positive S-shaped inner twisted wire 221 and the negative S-shaped inner twisted wire 222, preventing overheating between them and reducing their service life. This structure causes the relative position between the two inner twisted wires to change continuously, reducing the chance of the wires cutting magnetic field lines, thereby reducing the generation of eddy current effects. Eddy current effects can lead to energy loss and heating, and the twisted structure of the double inner twisted wires helps to reduce this effect, reducing the eddy current effect and electromagnetic interference intensity of the heating film, and eliminating the malfunction of the lithium battery protection board.

[0035] Example 2:

[0036] like Figure 8 As shown, the temperature control circuit 4 is connected to an NTC temperature sensing element 41. With this design, the NTC temperature sensing element 41 is installed in the space of the lithium battery 1, which can provide real-time feedback on the current temperature of the lithium battery 1, control the opening and closing of the heating circuit, improve heating accuracy, and increase the reliability of the heating circuit.

[0037] In this implementation, the NTC temperature sensing element 41 can sense changes in ambient temperature and convert them into electrical signals. This characteristic makes it the core component of the temperature control loop 4, enabling it to monitor and reflect temperature conditions in real time. In conjunction with the temperature control switch 3, the NTC temperature sensing element 41 can achieve temperature control. When the ambient temperature reaches the set value, the resistance value of the NTC will change, thereby triggering the temperature control switch 3 to control the operation of the heating or cooling equipment to maintain temperature stability. The high sensitivity and reliability of the NTC temperature sensing element 41 make the temperature control loop 3 more stable and reliable. It can quickly respond to temperature changes, ensuring that the system always stays within the set temperature range, thus improving the overall system stability and performance.

[0038] Example 3:

[0039] like Figure 4 , Figure 5As shown, there are two heating films 2. One heating film 2 consists only of an outer film 21 and a positive S-shaped inner twisted wire 221, while the other heating film 2 consists only of an outer film 21 and a reverse S-shaped inner twisted wire 222. This design allows the two heating films 2 to be perfectly bonded together without interlacing, thus achieving the purpose of twisted pair. This reduces the chance of the wire cutting the magnetic field lines, thereby reducing the generation of eddy current effect. The bonded film has a good appearance and is easy to position.

[0040] In this implementation case, since there are two heating films 2, there is no need to produce a separator film 23. This saves the production cost of a single heating film 2 and reduces the production difficulty to a certain extent, thus improving production efficiency. The heating film 2 with positive S-shaped inner twisted wire 221 and the heating film 2 with reverse S-shaped inner twisted wire 222 can be distinguished by touch. Then, the two heating films 2 can be perfectly glued together without crossing, thus achieving the purpose of twisted pair.

[0041] Example 4:

[0042] like Figure 6 As shown, there are two heating films 2. Both heating films 2 only include an outer film 21 and a positive S-shaped inner twisted wire 221. This design allows the two heating films 2 to be bonded together in an alternating manner to achieve the purpose of twisted pair, reducing the chance of the wire cutting the magnetic field lines, thereby reducing the generation of eddy current effect. There is no need to distinguish the front and back of the twisted pair 22 inside the heating film 2, which is conducive to mass production with uniform specifications.

[0043] In this implementation case, because it is a single specification, it is conducive to batch processing. When using it, the corner position of the S-shaped inner twisted wire 221 is determined by touch. Then, the two heating films 2 are attached in an alternating manner so that the corner positions are staggered, thereby achieving the purpose of twisted pair.

[0044] Example 5:

[0045] like Figure 7 As shown, there are two heating films 2. Each heating film 2 consists only of an outer film 21 and an inner twisted wire 222 in a reverse S-shape. This design allows the two heating films 2 to be bonded together in an alternating manner, thus achieving the purpose of twisted pair. This reduces the chance of the wire cutting the magnetic field lines, thereby reducing the generation of eddy current effect. There is no need to distinguish the front and back of the twisted pair 22 inside the heating film 2, which is conducive to mass production with uniform specifications.

[0046] In this implementation case, because it is a single specification, it is conducive to batch processing. When using it, the corner position of the reverse S-shaped inner twisted wire 222 is determined by touch. Then, the two heating films 2 are attached in an alternating manner so that the corner positions are staggered, thereby achieving the purpose of twisted pair.

[0047] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A temperature control device for a wind turbine pitch battery, comprising a heating film (2) in contact with a lithium battery (1), characterized in that: The heating film (2) is connected to a temperature control switch (3) and a temperature control circuit (4); The heating film (2) includes an outer film (21), inner stranded wires (22) and a separator (23). There are two inner stranded wires (22), both of which are located inside the outer film (21). The single-segment structure of the inner stranded wires (22) is S-shaped. The two inner stranded wires (22) are installed on both sides of the separator (23). The inner stranded wires (22) include a positive S-shaped inner stranded wire (221) and a reverse S-shaped inner stranded wire (222).

2. The temperature control device for a wind turbine pitch battery according to claim 1, characterized in that: The temperature control circuit (4) is connected to an NTC temperature sensing element (41).

3. The temperature control device for a wind turbine pitch battery according to claim 2, characterized in that: There are two heating films (2). One heating film (2) includes only the outer film (21) and the positive S-shaped inner twisted wire (221), and the other heating film (2) includes only the outer film (21) and the reverse S-shaped inner twisted wire (222).

4. The temperature control device for a wind turbine pitch battery according to claim 3, characterized in that: There are two heating films (2), each of which consists only of the outer film (21) and the S-shaped inner strand (221).

5. The temperature control device for a wind turbine pitch battery according to claim 4, characterized in that: There are two heating films (2), each of which consists only of the outer film (21) and the reverse S-shaped inner strand (222).

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