Battery cell heating device

Abstract

The utility model provides a battery cell heating device and belongs to the technical field of heating devices. The device comprises an electricity taking sheet, a static pressure plate, a cable, an electric control system, a temperature measuring system and a movable pressure plate. Through the movement of the movable pressing plate, a battery cell tab is fixed on the electricity taking sheet, an electric control system introduces alternating current with proper frequency into the battery cell tab through a cable and the electricity taking sheet, and the battery cell is heated under the alternating current to achieve the purpose of heating by utilizing the characteristics of'alternating current connection and direct current resistance 'of a capacitor structure and a capacitor of a positive plate and a negative plate in the battery cell. Through the detection of the temperature measuring system and the control of the electric control system, the battery cell can uniformly and accurately reach the set temperature. According to the utility model, the heating is quicker, the heating is more uniform, the production efficiency is higher, and the heat efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating devices, in particular to a battery core heating device. Background Art

[0002] Due to process requirements, the battery cells need to be heated during the production of lithium-ion batteries. Traditional technology usually uses a heating plate to contact the battery cells for heating, which has problems such as slow heating and uneven temperature. With the development of technology, two non-contact battery cell heating methods, hot air type and electromagnetic induction type, have emerged one after another. For example, the application number is 202222743489.4, and the name is a utility model of a bare battery cell hot circulation air heating box. It uses hot air to heat the battery cells. Compared with the heating method of the heating plate contacting the battery cells, the heat conduction area is increased, which improves the work efficiency to a certain extent. The utility model also recycles the hot air to reduce energy consumption. However, in this method, the heat is conducted from the outside to the inside, so the heating time is long, the temperature uniformity is poor, and the efficiency is still low. The utility model application number is 202021926827.2, and its name is an electromagnetic induction heating battery cell preheating tunnel furnace. It heats the battery cells by electromagnetic induction. The utility model drives the battery cells through the electromagnetic induction heating module in sequence through a conveyor belt and is heated by the electromagnetic field, and controls the heating temperature by adjusting the distance between the electromagnetic induction heating module and the battery cells. Because the battery cells generate induced eddy currents under the action of the alternating electromagnetic field, compared with the heat conduction methods from the outside to the inside of the heating plate contact type and the hot air type, the electromagnetic induction heating method can achieve simultaneous heating inside and outside, greatly shortening the heating time, thereby effectively improving production efficiency. However, the electromagnetic induction type still has some disadvantages: first, the outer pole piece of the battery cell has a certain electromagnetic shielding effect on the inner pole piece, resulting in uneven heating rates of the inner and outer layers of the battery cell. Secondly, since the electromagnetic induction heating module generates a large amount of heat, it usually requires cooling water, which increases energy consumption and equipment complexity. Utility Model Content

[0003] To address the shortcomings of existing patented technologies, this utility model proposes a battery cell heating device. By utilizing the capacitor structure of the positive and negative plates within the battery cell and the characteristic of capacitors that they "pass AC and block DC," an alternating current of appropriate frequency is passed through the positive and negative electrodes of the battery cell, causing the cell to heat up due to internal resistance.

[0004] The utility model proposes a battery cell heating device comprising a power extraction plate, a static pressure plate, a cable, an electric control system, a temperature measurement system, and a dynamic pressure plate. The power extraction plate is composed of two mutually insulated conductors, which are used to contact the two poles of the battery cell and energize the battery cell; the static pressure plate is used to fix the power extraction plate, and the static pressure plate and the power extraction plate are insulated; the cable connects the power extraction plate and the electric control system for transmitting current; the electric control system is used to provide the electric energy required for heating the battery cell, and the frequency, voltage, current and other parameters can be manually adjusted, or automatically adjusted according to the temperature value fed back by the temperature measurement system; the temperature measurement system is used to measure the battery cell temperature and feed it back to the electric control system; the dynamic pressure plate is used to press the battery cell poles and the power extraction plate, so that the battery cell poles and the power extraction plate are stably connected.

[0005] The utility model is realized through the following technical scheme: the two pole ears of the battery cell are respectively placed on the two power-taking sheets, the dynamic pressure plate is pressed down to make the pole ears in good contact with the power-taking sheets, the electric control system energizes the battery cell through the cable and the power-taking sheet, the temperature of the battery cell rises after being energized, the temperature measurement system detects the temperature of the battery cell and feeds back to the electric control system for automatic adjustment so that the temperature reaches the set range.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0007] 1. The positive and negative electrodes of the battery cell form a circuit under the alternating current and generate heat, so it has the advantage of rapid heating.

[0008] 2. The current on the inner and outer electrodes is equal, so the heating is more uniform and the production efficiency is higher.

[0009] 3. The positive and negative electrodes inside the battery cell are heating elements, and there are no additional heating elements, so the thermal efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model.

[0011] Figure 2 Schematic diagram of the structure of the embodiment.

[0012] Figure 1 Middle: 1-power supply plate, 2-static pressure plate, 3-cable, 4-electric control system, 5-temperature measurement system, 6-dynamic pressure plate, 61-pressure head, 62-buffer block, 63-dynamic plate

[0013] Figure 2 Middle: 1-power supply plate, 2-static pressure plate, 3-cable, 4-electrical control system, 5-temperature measurement system, 6-dynamic pressure plate, 7-lower die, 8-upper die, 9-press, 91-workbench, 92-movable crossbeam DETAILED DESCRIPTION

[0014] The following will be combined with the accompanying drawings of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, the battery cell heating device includes a power extraction plate 1, a static pressure plate 2, a cable 3, an electronic control system 4, a temperature measurement system 5, a dynamic pressure plate 6, a pressure head 61, a buffer block 62, and a dynamic plate 63.

[0016] Among them, there are two power-taking sheets 1, and the two power-taking sheets 1 are made of conductive material and insulated from each other. They are used to contact the two pole ears of the battery cell and energize the battery cell. The positions and shapes of the two power-taking sheets 1 correspond to the positions and shapes of the two pole ears of the battery cell respectively; the static pressure plate 2 is used to fix the power-taking sheet 1, and the static pressure plate 2 is insulated from the power-taking sheet 1; the cable 3 connects the power-taking sheet 1 and the electronic control system 4, and is used to transmit current to the power-taking sheet 1; the electronic control system 4 is used to provide the electric energy required for heating the battery cell, and the frequency, voltage, current and other parameters can be manually adjusted, or automatically adjusted according to the temperature value feedback from the temperature measurement system 5; the temperature measurement system 5 is used to measure the temperature of the battery cell and feed it back to the electronic control system 4; the dynamic pressure plate 6 is used to press the battery cell pole ear and the power-taking sheet 1, so that the battery cell pole ear and the power-taking sheet 1 are stably conductively connected.

[0017] Specifically, the dynamic pressure plate 6 includes a pressure head 61, a buffer block 62, and a dynamic plate 63. There are two pressure heads 61. The two pressure heads 61 are insulated from each other and are positioned vertically facing the power extraction sheet 1. Preferably, the pressure head 61 is made of an insulator. There are two buffer blocks 62. The two buffer blocks 62 connect the two pressure heads 61 to the dynamic plate 63 respectively. Preferably, the buffer blocks 62 are made of elastic materials such as rubber or a metal spring structure. The dynamic plate 63 drives the pressure head 61 and the buffer block 62 to move up and down. When the dynamic plate 63 moves downward, it drives the pressure head 61 to move, so that a stable conductive connection is formed between the battery cell tab pressure and the power extraction sheet 1. The buffer block 62 forms a buffer between the dynamic plate 63 and the pressure head 61 to prevent damage to the battery cell tab due to pressure shock.

[0018] The utility model provides a metal mold cavity surface heating device, which, when working, places the two pole ears of the battery cell respectively above the two power-taking sheets 1. When the movable plate 63 moves downward, it drives the pressure head 61 to move, so that the battery cell pole ears are pressed and a stable conductive connection is formed between the power-taking sheets 1. The buffer block 62 forms a buffer between the movable plate 63 and the pressure head 61 to prevent the battery cell pole ears from being damaged due to pressure shock. The electronic control system 4 energizes the battery cell through the cable 3 and the power-taking sheet 1. The temperature of the battery cell rises after being energized. The temperature measurement system 5 detects the battery cell temperature and feeds back to the electronic control system 4 for automatic adjustment so that the temperature reaches the set range.

[0019] Example 1:

[0020] During the hot pressing and shaping process of battery cells, the wound or stacked battery cells need to be placed on a template, the pressure and temperature are set, and then the upper and lower templates are used to shape the battery cells under a certain pressure and temperature to achieve consistent battery cell thickness, reduce battery cell elasticity, reduce the qualified rate of core installation, and ensure the consistency of the thickness of the finished battery cells.

[0021] like Figure 2 As shown, a metal lower mold cavity surface heating device includes Figure 2 Middle: 1-power supply plate, 2-static pressure plate, 3-cable, 4-electrical control system, 5-temperature measurement system, 6-dynamic pressure plate, 7-lower die, 8-upper die, 9-press, 91-workbench, 92-movable crossbeam

[0022] Among them, using the press 9 to provide pressure is a conventional technical means. The lower mold 7 is fixed on the workbench 91, and the upper mold 8 is fixed on the movable beam 92. The movable beam 92 moves up and down under power drive, driving the upper mold 8 to move up and down, so as to achieve the purpose of forming opening and closing actions between the upper mold 8 and the lower mold 7.

[0023] Furthermore, the static pressure plate 2 is fixed to one end of the lower mold 7, and there are two power-taking plates 1, which are respectively fixed on the static pressure plate 2. The cable 3 connects the power-taking plate 1 and the electronic control system 4, and is used to transmit current to the power-taking plate 1; the electronic control system 4 is used to provide the electric energy required for heating the battery cell, and the frequency, voltage, current and other parameters can be manually adjusted, and can also be automatically adjusted according to the temperature value feedback from the temperature measuring system 5; the temperature measuring system 5 is used to measure the temperature of the battery cell and feed it back to the electronic control system 4; the temperature measuring system 5 is embedded in the inner surface of the lower mold 7, and the dynamic pressure plate 6 is fixed to one end of the upper mold 8, and its position corresponds to the static pressure plate 2.

[0024] Tabs are a crucial component in lithium-ion batteries. They are the metal conductors that lead the positive and negative electrodes from the battery cell. Two adjacent conductors, sandwiched between a non-conductive insulating layer, form a capacitor. The positive and negative electrodes and separator of a battery cell are assembled using a winding or stacking process. The positive and negative electrodes are close together within the cell, separated by a separator, giving the cell the structure of a capacitor.

[0025] During operation, the battery cell is placed in the cavity of the lower mold 7, and the two tabs of the battery cell are placed above the two power extraction plates 1. The press 9 drives the movable crossbeam 92 downward, driving the upper mold 8 and the dynamic pressure plate 6 downward to form a stable conductive connection between the battery cell tab and the power extraction plate 1. The electronic control system 4 energizes the battery cell through the cable 3 and the power extraction plate 1. After the battery cell is energized, the temperature rises. The temperature measurement system 5 detects the battery cell temperature and feeds it back to the electronic control system 4 for automatic adjustment to bring the temperature within the set range. After reaching the temperature, the press 9 drives the movable crossbeam 92 to continue moving downward, driving the upper mold 8 downward to close the mold with the lower mold 7, so that the battery cell is shaped at the set temperature and pressure.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A battery core heating device, characterized in that: The battery cell heating device comprises a power extraction plate (1), a static pressure plate (2), a cable (3), an electric control system (4), a temperature measurement system (5), and a dynamic pressure plate (6); the power extraction plate (1) is insulated and fixed on the static pressure plate (2), the cable (3) conductively connects the power extraction plate (1) and the electric control system (4), and the temperature measurement system (5) is used to measure the battery cell temperature and feed back to the electric control system (4); the dynamic pressure plate (6) is located above the static pressure plate (2), and when the dynamic pressure plate (6) moves downward, it presses the battery cell pole ear and the power extraction plate (1) so that the battery cell pole ear and the power extraction plate (1) are stably conductively connected, and the electric control system (4) transmits a specific frequency alternating current to the battery cell pole ear.

2. The electric core heating device according to claim 1, characterized in that: There are two power extraction sheets (1), which are made of conductive material and insulated from each other, and are used to respectively conduct electricity to connect the two pole ears of the battery cell. The position and shape of the power extraction sheet 1 respectively correspond to the position and shape of the two pole ears of the battery cell.

3. The electric core heating device according to claim 2, characterized in that: The movable pressure plate (6) comprises a pressure head (61), a buffer block (62), and a movable plate (63). The number of the pressure head (61) and the number of the buffer block (62) are both two, and the two buffer blocks (62) respectively connect the two pressure heads (61) to the bottom of the movable plate (63).

4. The electric core heating device according to claim 3, characterized in that: The buffer block (62) adopts a metal spring structure.

5. The electric core heating device according to claim 4, characterized in that: The two pressing heads (61) are insulated from each other and are respectively positioned vertically opposite to the two power extraction sheets (1); when the movable plate (63) moves downward, it drives the pressing head (61) to move, so that the battery cell tab is pressed tightly against the power extraction sheet (1) to form a stable conductive connection; the buffer block (62) forms a buffer between the movable plate (63) and the pressing head (61).

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