CN211240148U

CN211240148U - Electromagnetic heating device for heating battery pole piece

Info

Publication number: CN211240148U
Application number: CN201921525563.7U
Authority: CN
Inventors: 周三春; 杨振胡; 姜耀文
Original assignee: Shenzhen Yinghe Technology Co Ltd
Current assignee: Shenzhen Yinghe Technology Co Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-08-11
Anticipated expiration: 2029-09-09

Abstract

The utility model discloses an electromagnetic heating device for heating of battery pole piece. The electromagnetic heating device comprises a heating coil (1) and a protective cover (2); the heating coil (1) is arranged in the protective cover (2); a magnetizer (3) is arranged inside the protective cover (2); the magnetizer (3) surrounds the heating coil (1); a magnetic through hole (31) is formed in the side face of the magnetizer (3) along the length direction of the heating coil (1), and the magnetizer (3) surrounds the heating coil (1) in an open manner; the magnetizer (3) is used for guiding the magnetic field generated by the heating coil (1) and enabling the magnetic field to uniformly penetrate out of the magnetic through hole (31). The utility model discloses an electromagnetic heating device is used for heating battery pole piece, can make battery pole piece substrate carry out the even heating, avoids appearing the uneven phenomenon of heating.

Description

Electromagnetic heating device for heating battery pole piece

Technical Field

The utility model relates to a lithium cell production technical field, concretely relates to an electromagnetic heating device for heating of battery pole piece.

Background

Aluminum foil is generally used as a positive electrode sheet substrate for lithium batteries. In the rolling production of the lithium battery, the coating area of the pole piece is inconsistent with the elongation of the aluminum foil, so that the aluminum foil wrinkles, thereby causing the broken strip of the pole piece, failing to produce normally and affecting the product quality. Therefore, the pole piece substrate of the lithium battery needs to be heated and softened so as to facilitate the stretching and wrinkle removal of the pole piece and ensure that the extension of the aluminum foil and the extension of the coating area are basically consistent.

However, in the existing rolling production process of the lithium battery pole piece, a forced stretching mode is adopted to ensure that the extension of the aluminum foil and the coating area is basically consistent. The disadvantages of this approach are: the aluminum foil is required to have high tensile strength, no fine gap is allowed at the edge, the compaction density is not high, and the requirement of high capacity of the battery cannot be met.

Magnetic induction heating is used as a common mode of metal heating, the heating mode does not need to contact a pole piece, the advancing speed of the pole piece is not influenced, high efficiency and energy conservation are realized, and pollution or damage to the pole piece is avoided by non-contact heating. However, the current electromagnetic heating methods for pole pieces all suffer from aluminum foil edge burning or uneven heating at local low temperature, which causes failure, and is the biggest bottleneck in high-capacity lithium battery production.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electromagnetic heating device for heating of battery pole piece to the defect or not enough that exist among the prior art. The electromagnetic heating device is used for heating the battery pole piece, so that the base material of the battery pole piece can be uniformly heated, and the phenomenon of nonuniform heating is avoided.

The purpose of the utility model is realized through the following technical scheme.

An electromagnetic heating device for heating a battery pole piece comprises a heating coil and a protective cover; the heating coil is arranged in the protective cover; a magnetizer is arranged inside the protective cover; the magnetizer surrounds the heating coil;

and along the length direction of the heating coil, a magnetic flux opening is formed in the side surface of the magnetizer, and the magnetizer surrounds the heating coil in an open manner; the magnetizer is used for guiding the magnetic field generated by the heating coil and enabling magnetic induction lines of the magnetic field to uniformly penetrate out of the magnetic flux opening.

Preferably, the magnetizer is distributed along the inner wall of the protective cover.

Preferably, the magnetic through hole is a strip-shaped notch, and the length direction of the strip-shaped notch is consistent with the length direction of the heating coil.

More preferably, the magnetic through hole has a length greater than that of the heating coil and a width greater than a diameter of the heating coil.

Preferably, both ends of the heating coil penetrate through the magnetizer and the protective cover and extend out of the protective cover;

and the two ends of the heating coil penetrate through the direction of the protective cover and the direction of the magnetic induction line of the magnetic field penetrating out of the magnetic through hole is vertical.

More preferably, both ends of the heating coil penetrate and extend out of the end part of the protection cover and are provided with power connectors in a connection mode.

More preferably, the wire of the heating coil is a hollow wire; and two ends of the heating coil penetrate through and extend out of the protective cover and are respectively used for connecting a cooling water inlet pipeline and a cooling water outlet pipeline.

Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:

(1) the utility model discloses an electromagnetic heating device is used for heating the aluminium foil substrate of battery pole piece, and wherein the guide of the magnetic field accessible magnetizer that heating coil produced and even wear out from the magnetic opening to thereby it produces even eddy current in order to carry out even heating to be cut by battery pole piece substrate, avoids appearing burning the phenomenon that limit or local temperature can not reach the temperature requirement.

(2) The utility model discloses an electromagnetic heating device is being used for heating battery pole piece in-process, can make battery pole piece substrate carry out the even heating, avoids appearing the uneven phenomenon of heating to can concentrate the heating in the white district of staying of battery pole piece, thereby make and stay white district and produce high temperature, and the coating district produces low temperature, when more being favorable to the drawing wrinkle removal of battery pole piece, can also effectively keep the stability in coating district.

Drawings

Fig. 1 is a schematic front sectional view of an electromagnetic heating apparatus according to an embodiment of the present invention;

fig. 2 is a schematic left-side sectional view of an electromagnetic heating apparatus according to an embodiment of the present invention;

fig. 3 is a schematic front view of a cross-sectional structure of an electromagnetic heating device according to an embodiment of the present invention when the electromagnetic heating device is used for heating a battery pole piece;

fig. 4 is a schematic left-side sectional structure view of the electromagnetic heating device of the present invention for heating a battery pole piece during operation in an exemplary embodiment;

the attached drawings are marked as follows: 1-heating coil, 2-protective cover, 3-magnetizer, 31-magnetic port, 4-power connector, 5-cooling water inlet pipe, 6-cooling water outlet pipe, 7-magnetic induction line, 8-battery pole piece, 801-blank area, 802-coating area and 9-temperature sensor.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following specific embodiments and accompanying drawings, but the scope of protection and the implementation of the present invention are not limited thereto. In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that the products of the present invention are usually placed in when used, and are used only for distinguishing the descriptions, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the terms refer must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present invention, and even as indicating or implying relative importance.

Example 1

Referring to fig. 1 and 2, the electromagnetic heating device for heating a battery pole piece of the present embodiment includes a heating coil 1 and a protection cover 2; the heating coil 1 is disposed inside the protective cover 2.

Furthermore, the inside of safety cover 2 is provided with magnetizer 3, magnetizer 3 surrounds heating coil 1. In this embodiment, the heating coil 1 is a copper coil. Specifically, the protective cover 2 is of a closed body structure, and the magnetizers 3 are distributed along the inner wall of the protective cover 2; in the embodiment, the cross section of the inside of the protection cover 2 is rectangular, and the magnetizer 3 is a frame-shaped structure with a rectangular cross section along with the distribution of the inner wall of the protection cover 2.

Specifically, along the length direction of the heating coil 1, a magnetic opening 31 is formed in the side surface of the magnetizer 3, so that the magnetizer 3 openly surrounds the heating coil 1. That is, in this embodiment, the magnetizers 3 are distributed on the front and rear sides, the left and right sides, and the bottom sides of the heating coil 1, and the magnetizers 3 distributed on the front and rear sides, the left and right sides, and the bottom sides of the heating coil 1 are integrated, and the magnetizer 3 is not distributed on the upper side of the heating coil 1, so that the magnetizer 3 is in a frame-shaped structure with an open top and surrounds the heating coil 1 in an open manner, and the flux opening 31 is the open top of the magnetizer 3.

The magnetizer 3 is used for guiding the magnetic field generated by the heating coil 1, and the magnetic induction lines 7 of the magnetic field uniformly penetrate out of the magnetic through hole 31. After the heating coil 1 is introduced with high-frequency high-voltage current, the heating coil 1 can generate an alternating magnetic field which changes at a high speed, and due to the arrangement of the magnetizer 3, magnetic induction lines 7 of the magnetic field can be uniformly reflected and guided by the magnetizer 3; the magnetic flux opening 31 is the open top of the magnetizer 3, so that the magnetic induction lines 7 uniformly reflected and guided by the magnetizer 3 uniformly penetrate out of the magnetizer 3 from the magnetic flux opening 31, and the whole device generates a uniform and directional magnetic field; after the magnetic induction lines 7 emitted by the whole device are cut by the battery pole piece substrate, uniform eddy current is generated in the battery pole piece substrate, so that uniform heating is realized, and the phenomenon that the edge burning or the local temperature cannot meet the temperature requirement is avoided.

In this embodiment, the magnetic through hole 31 is a strip-shaped notch, and the length direction of the strip-shaped notch is consistent with the length direction of the heating coil 1. The length of the magnetic through hole 31 is greater than the length of the heating coil 1, the width is greater than the diameter of the heating coil 1, and the height of the magnetizer 3 is greater than the diameter of the heating coil 1. Therefore, the magnetic field generated by the heating coil 1 can be guided and reflected under the action of the magnetizer 3, and can penetrate out of the magnetizer 3 from the magnetic flux port 31, so that the magnetic field can be fully utilized, and the working efficiency of the heating coil 1 is greatly improved.

In addition, both ends of the heating coil 1 penetrate through the magnetizer 3 and the protection cover 2 and extend out of the protection cover 2. Wherein, the magnetizer 3 and the protective cover 2 are provided with pore channels for accommodating the end part of the heating coil 1 to extend out, and the pore channels arranged in the magnetizer 3 are communicated with the pore channels arranged in the protective cover 2 so as to accommodate the end part of the heating coil 1 to extend out; a 90-degree bending angle is formed between the pore passage in the magnetizer 3 and the pore passage in the protective cover 2, so that the end part of the heating coil 1 sequentially penetrates through the magnetizer 3 and the protective cover 2 and extends out after penetrating through the pore passage and the protective cover 2 to form a 90-degree bend, and the direction that two ends of the heating coil 1 penetrate through the protective cover 2 is perpendicular to the direction that the magnetic induction lines 7 of the magnetic field penetrate through the magnetic through opening 31; moreover, the outer wall of the end part of the heating coil 1, the pore channel in the magnetizer 3 and the pore channel in the protective cover 2 are hermetically filled; so, stretch out again after through making the tip of heating coil 1 crooked 90, and seal between outer wall and the pore and fill, can effectively prevent the magnetic field leakage that heating coil 1 produced, avoid the emergence of magnetic leakage phenomenon, be favorable to realizing the make full use of the magnetic field that heating coil 1 produced, further improve heating coil 1's work efficiency.

And power connectors 4 are respectively connected to the end parts of the two ends of the heating coil 1 penetrating and extending out of the protective cover 2. The heating coil 1 is electrically connected with an external high-frequency high-voltage through a power connector 4, so that a power supply for generating an alternating magnetic field is provided for the heating coil 1.

Further, the wire of the heating coil 1 is a hollow wire. Two ends of the heating coil 1 penetrate and extend out of the protective cover 2 and are respectively used for connecting a cooling water inlet pipeline 5 and a cooling water outlet pipeline 6. In the working process that the heating coil 1 is connected with high-frequency high-voltage electricity to carry out electromagnetic induction, the heating coil 1 can generate high temperature due to self resistance; therefore, the hollow wire is used as the wire of the heating coil 1, the two ends of the heating coil 1 are connected with the cooling water inlet pipeline 5 and the cooling water outlet pipeline 6, when the heating coil 1 performs electromagnetic work, circulating cooling water can be introduced to cool the heating coil 1, the potential safety hazard of burning or fire caused by overhigh temperature of the heating coil 1 is avoided, and the safety performance and the service life of the whole electromagnetic heating device are improved.

Referring to fig. 3 and 4, the electromagnetic heating device of the present embodiment is used for heating the battery pole piece. Wherein, the base material of the battery pole piece 8 is aluminum foil; the magnetic flux opening 31 is arranged corresponding to the battery pole piece 8, the battery pole piece 8 is positioned above the electromagnetic heating device, and the length direction of the magnetic flux opening 31 is consistent with the advancing direction of the battery pole piece 8; at battery pole piece 8 in-process of marcing, thereby the base material of battery pole piece 8 will evenly cut the magnetic induction line 7 of electromagnetic heating device transmission and produce even eddy current, and then make the base material of battery pole piece 8 carry out the even heating, avoid appearing heating inhomogeneous phenomenon, realize the softening treatment to the base material of battery pole piece 8, do benefit to the drawing of battery pole piece base material and remove the wrinkle.

Moreover, in a preferred embodiment, a temperature sensor 9 corresponding to an electromagnetic heating device can be arranged above the battery pole piece 8 for real-time detection and monitoring of temperature; and the temperature sensor 9 and the electromagnetic heating device can be connected by closed-loop control through a controller, so that the temperature detected by the temperature sensor 9 can carry out closed-loop feedback control on the electromagnetic heating device, and the control on the heating temperature of the base material of the battery pole piece 8 is further improved.

In a specific application, referring to fig. 4, the electromagnetic heating device of the present embodiment can intensively heat the blank region 801 of the battery pole piece 8, so that the blank region 801 generates a high temperature, and the coating region 802 generates a low temperature. Specifically, the magnetic flux port 31 of the electromagnetic heating device is correspondingly arranged right below the blank area 801 of the battery pole piece 8, so that the magnetic flux penetrating from the blank area 801 is greater than the magnetic flux penetrating from the coating area 802, therefore, in the process of advancing the battery pole piece 8, the eddy current generated by the substrate cutting magnetic induction lines 7 of the blank area 801 is greater than the eddy current generated by the substrate cutting magnetic induction lines 7 of the coating area 802, and further, the heating temperature of the substrate of the blank area 801 is greater than the heating temperature of the substrate of the coating area 802.

Since the wrinkle rate of the blank region 801 is generally high and the wrinkle rate of the coating region 802 is low in the battery pole piece 8, the high temperature of the coating region 802 is not favorable for the stability of the coating. Therefore, the blank region 801 is heated in a concentrated manner, so that the blank region 801 generates high temperature, the requirement of softening treatment for stretching and wrinkle removal of the base material of the blank region 801 is met, the coating region 802 generates low temperature, the stretching and wrinkle removal of the battery pole piece 8 are facilitated, and the stability of the coating region 802 can be effectively maintained.

The above embodiments are merely preferred embodiments of the present invention, and only lie in further detailed description of the technical solutions of the present invention, but the protection scope and the implementation manner of the present invention are not limited thereto, and any changes, combinations, deletions, replacements, or modifications that do not depart from the spirit and principles of the present invention will be included in the protection scope of the present invention.

Claims

1. An electromagnetic heating device for heating a battery pole piece is characterized by comprising a heating coil (1) and a protective cover (2); the heating coil (1) is arranged in the protective cover (2); a magnetizer (3) is arranged inside the protective cover (2); the magnetizer (3) surrounds the heating coil (1);

a magnetic through hole (31) is formed in the side face of the magnetizer (3) along the length direction of the heating coil (1), and the magnetizer (3) surrounds the heating coil (1) in an open manner; the magnetizer (3) is used for guiding the magnetic field generated by the heating coil (1) and enabling magnetic induction lines of the magnetic field to uniformly penetrate out of the magnetic through hole (31).

2. An electromagnetic heating device for heating battery pole pieces according to claim 1, characterized in that the magnetizer (3) is distributed along the inner wall of the protecting cover (2).

3. The electromagnetic heating device for heating battery pole pieces according to claim 1, characterized in that the magnetic through opening (31) is a strip-shaped notch, and the length direction of the strip-shaped notch is consistent with the length direction of the heating coil (1).

4. An electromagnetic heating device for heating battery pole pieces according to claim 3, characterized in that the magnetic through opening (31) has a length greater than the length of the heating coil (1) and a width greater than the diameter of the heating coil (1).

5. The electromagnetic heating device for heating the battery pole piece according to any one of claims 1 to 4, wherein both ends of the heating coil (1) penetrate through the magnetizer (3) and the protective cover (2) and extend out of the protective cover (2);

and the two ends of the heating coil (1) penetrate through the direction of the protective cover (2) and the direction of the magnetic induction line of the magnetic field penetrating out of the magnetic through hole (31) are perpendicular.

6. The electromagnetic heating device for heating the battery pole piece is characterized in that both ends of the heating coil (1) penetrate through the end parts extending out of the protective cover (2) and are provided with power connectors (4) in a connecting mode.

7. The electromagnetic heating device for heating battery pole pieces as claimed in claim 5, characterized in that the wire of the heating coil (1) is a hollow wire; and two ends of the heating coil (1) penetrate through and extend out of the protective cover (2) and are respectively used for connecting a cooling water inlet pipeline and a cooling water outlet pipeline.