CN202495520U - Pole piece winding heating device - Google Patents

Abstract

The utility model belongs to the technical field of lithium-ion batteries, and in particular relates to a pole piece winding heating device capable of improving the rebound consistency of lithium-ion battery pole pieces. The rotating shaft is wound up, and the oven body is fixed on the frame. Compared with the prior art, the utility model bakes the anode pole pieces at the cold-pressed winding place, so that the pole pieces of the inner ring of the reel get sufficient rebound, effectively improving the consistency of the rebound of the pole pieces of the inner and outer rings of the reel. sex. At the same time, baking the pole piece during the winding process also saves the large roll baking process after cold pressing, which greatly reduces the production time of the product and improves the production efficiency.

Description

Pole piece winding heating device

technical field

The utility model belongs to the technical field of lithium ion batteries, in particular to a pole piece winding heating device capable of improving the rebound consistency of lithium ion battery pole pieces.

Background technique

As an important part of the lithium-ion battery, the battery anode plate has a very important impact on the consistency of its rebound on the performance of the lithium-ion battery. After coating and drying, the anode sheet of the battery needs to undergo a cold pressing process to improve the physical contact between the particles, reduce the volume of the lithium-ion battery after packaging, and increase the energy density of the battery. Since the graphite structure of the anode pole piece will rebound after cold pressing, it is difficult to guarantee the consistency of the pole piece rebound of the inner and outer rings of the reel after winding.

At present, the anode sheet of lithium-ion battery adopts the way of large roll baking to release the rebound after cold pressing and winding. It is difficult to release the stress of the pole piece on the inner ring of the reel, while the pole piece on the outer ring can rebound more fully. In this way, the anode pole piece of the inner ring of the reel will continue to rebound after the battery core is wound, which will easily cause defective products such as deformation of the battery core and misalignment of the winding.

Among the existing measures to improve the rebound consistency of the anode pole piece, one is to preheat the pole piece before cold pressing, which can only allow the pole piece to fully rebound before cold pressing. After cold pressing, the compaction density of the pole piece increases, and the pole piece will still rebound during the winding process, and the rebound in this process is uncontrollable. Another way is to bake the cold-pressed large coil material at high temperature, which is also the main way to release the rebound at present. The disadvantage of this method is that the pole pieces of the outer ring of the reel can fully rebound completely, but the pole pieces of the inner ring cannot fully rebound due to being squeezed by the pole pieces of the outer ring. Another way is to heat the pole piece through a preheating plate after cold pressing, but due to the high speed of cold pressing, the actual heating time of the pole piece is very short, and the effect is not obvious.

In view of this, it is indeed necessary to provide a device capable of improving the rebound consistency of the anode pole piece.

Utility model content

The purpose of the utility model is to provide a pole piece winding heating device capable of improving the rebound consistency of the anode pole piece.

In order to achieve the above object, the utility model adopts the following technical solutions:

A pole piece winding heating device includes a baking oven body, a heating pipe and a winding rotating shaft arranged in the baking oven body, and the baking oven body is fixed on a frame.

As an improvement of the pole piece winding heating device of the utility model, a heating tube installation cover is arranged outside the heating tube.

As an improvement of the pole piece winding heating device of the utility model, a temperature sensor is also arranged in the oven body.

As an improvement of the pole piece winding heating device of the present invention, the frame is provided with a control device, and the temperature sensor feeds back the internal temperature of the oven body to the control device for temperature adjustment.

As an improvement of the pole piece winding heating device of the utility model, a control switch is arranged on the frame.

As an improvement of the pole piece winding heating device of the utility model, the heating pipes are evenly distributed around the winding shaft to ensure that each position of the pole piece is evenly heated during winding. Preferably, 11 infrared heating tubes are installed inside the pole piece winding heating device, and each tube contains 3 small tubes of 1 kilowatt, which can reach up to 200°C.

As an improvement of the pole piece winding heating device of the utility model, an infrared heating wire is arranged inside the heating tube.

As an improvement of the pole piece winding heating device of the utility model, the oven body includes an upper cover and a lower cover that match each other.

As an improvement of the pole piece winding heating device of the utility model, the upper cover of the oven body is provided with two grooves for placing the winding shaft.

Compared with the prior art, the utility model bakes the anode pole pieces at the cold-pressed winding place, so that the pole pieces of the inner ring of the reel can be fully rebounded, which effectively improves the consistency of the rebound of the pole pieces of the inner and outer rings of the reel. sex. At the same time, baking the pole piece during the winding process also saves the large roll baking process after cold pressing, which greatly reduces the production time of the product and improves the production efficiency.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model and its beneficial technical effect are described in detail:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a perspective view of the utility model.

Detailed ways

As shown in Figures 1 and 2, the pole piece rewinding heating device of the present invention includes a baking oven body 1, a heating tube 2 and a winding shaft 3 arranged in the oven body 1, and the oven body 1 Oven body 1 is fixed on the frame 4.

Wherein, the oven body 1 includes an upper cover 11 and a lower cover 12 that match each other, and the upper cover 11 of the oven body 1 is provided with two grooves 9 for placing the winding shaft 3 .

The heating tube 2 is provided with a heating tube installation cover 5 , and the heating tube 2 is provided with an infrared heating wire 21 , and the heating tubes 2 are evenly distributed around the winding shaft 3 . To ensure that all positions are evenly heated when the pole piece is rolled. Preferably, 11 infrared heating tubes are installed inside the pole piece winding heating device, and each tube contains 3 small tubes of 1 kilowatt, which can reach up to 200°C.

A temperature sensor 6 is also arranged inside the oven body 1 , and a control device 7 is arranged on the frame 4 . . The temperature sensor 6 is used to collect temperature, and the collected temperature data is fed back to the control device 7 for analysis, and the temperature in the oven body 1 is adjusted according to the set temperature data. The frame 4 is provided with a control switch 8 for controlling the opening or closing of the pole piece winding heating device.

Wherein, the oven body 1 is a sandwich structure, the outer layer is a steel plate, and the sandwich layer is heat-insulating rock wool, so as to prevent the heat in the oven body 1 from dissipating and play a role of heat preservation. The entire pole piece winding heating device is 1330mm long and 580mm wide, and the space occupied should be as small as possible. The applicable temperature range of the device is between room temperature and 200°C.

When in use, place the pole piece rewinding heating device at the rewinding position of the cold press, then put the rewinding shaft 3 into the groove 9 of the oven body 1, then place the coiled material on the rewinding shaft 3, cover On the upper cover 11 of the baking oven body 1, press the control switch 8 to turn on the pole piece winding heating device, the infrared heating wire 21 starts to heat, and the temperature sensor 6 starts to collect temperature data at the same time. In order to realize the rapid rebound of the pole piece after cold pressing, the temperature of the oven body 1 is set to 100-120°C on the control device 7, and the large roll of coil material after cold pressing is rolled on the pole while cold pressing is rolled. Baking is carried out in the baking oven body 1 of the sheet winding heating device. The control device 7 analyzes the temperature in the oven body 1 collected by the temperature sensor 6 in the oven body 1, and controls the temperature in the oven body 1 according to the set temperature. After the cold pressing and winding is completed, turn off the pole piece winding heating device, and take out the coil material.

Compared with the prior art, the utility model bakes the anode pole pieces at the cold-pressed winding place, so that the pole pieces of the inner ring of the reel can be fully rebounded, which effectively improves the consistency of the rebound of the pole pieces of the inner and outer rings of the reel. sex. At the same time, baking the pole piece during the winding process also saves the large roll baking process after cold pressing, which greatly reduces the production time of the product and improves the production efficiency.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also make appropriate changes and modifications to the above embodiment. Therefore, the utility model is not limited to the specific implementation manners disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (9)

1. A pole piece rewinding heating device, characterized in that: comprising a baking oven body (1) and a heating tube (2) and a rewinding rotating shaft (3) arranged in the oven body (1), The oven body (1) is fixed on the frame (4). 2. The pole piece winding heating device according to claim 1, characterized in that: a heating tube installation cover (5) is arranged outside the heating tube (2). 3. The pole piece winding heating device according to claim 1, characterized in that: a temperature sensor (6) is also arranged in the oven body (1). 4. The pole piece winding heating device according to claim 1, characterized in that a control device (7) is arranged on the frame (4). 5. The pole piece winding and heating device according to claim 1, characterized in that: the frame (4) is provided with a control switch (8). 6. The pole piece winding heating device according to claim 1, characterized in that: the heating pipes (2) are evenly distributed around the winding shaft (3). 7. The pole piece winding heating device according to claim 1, characterized in that: an infrared heating wire (21) is arranged in the heating tube (2). 8. The pole piece winding heating device according to claim 1, characterized in that: the oven body (1) includes an upper cover (11) and a lower cover (12) that match each other. 9. The pole piece rewinding heating device according to claim 8, characterized in that: the upper cover (11) of the oven body (1) is provided with two rewinding shafts (3 ) groove (9).

Images