Electrode assembly hot-pressing device

Abstract

The utility model relates to the technical field of batteries, and discloses an electrode assembly hot-pressing device which has a first direction and a second direction which are vertically intersected in pairs, and comprises an accommodating box, a hot-pressing mechanism, a first pipeline and a second pipeline, the containing box is provided with a containing cavity used for containing an electrode assembly. The hot pressing mechanism is arranged at the top of the containing box, and the output end of the hot pressing mechanism can extend into the containing cavity and is used for compacting the electrode assembly; one end of the first pipeline communicates with the containing cavity, and the other end of the first pipeline extends out of the containing box and is used for being connected with a vacuum generating device. One end of the second pipeline is communicated with the containing cavity, and the other end of the second pipeline extends out of the containing cavity and is used for being connected with a heating gas supply device. The electrode assembly has the beneficial effects that the influence of environment temperature on the hot-pressing process of the electrode assembly is avoided, the hot-pressing efficiency of the electrode assembly is improved, the hot-pressing consistency of the inner ring and the outer ring of the thicker electrode assembly is improved, and the stability of a battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of electrode assembly hot-pressing device. BACKGROUND

[0002] Electrode assembly is the important component of battery, after positive sheet, negative sheet and diaphragm are wound or laminated to form electrode assembly, electrode assembly is integrally bonded and shaped by heating and pressing.

[0003] The existing hot-pressing device generally carries out hot-pressing on electrode assembly by the heat conduction of hot-pressing plate under normal temperature condition, electrode assembly is easily affected by ambient temperature in the process of hot-pressing by using this hot-pressing mode, and the heat of electrode assembly hot-pressing is easily lost to surrounding environment, in addition, when the existing hot-pressing device carries out hot-pressing on thicker electrode assembly, if hot-pressing time is insufficient, electrode assembly inside will be not pressed solid, if hot-pressing time is too long, electrode assembly outer circle will be over-pressed, the consistency of electrode assembly inner circle and outer circle is poor, and deformation is easily generated in the process of battery charging and discharging, which leads to the wrinkle of battery and then leads to the capacity reduction of battery, and reduces the service life of battery. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of electrode assembly battery hot-pressing device, avoid the influence of ambient temperature on the hot-pressing process of electrode assembly, improve the hot-pressing efficiency of electrode assembly, improve the consistency of hot-pressing of thicker electrode assembly inner circle and outer circle, and improve the stability of battery.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a kind of electrode assembly hot-pressing device, with first direction and second direction that are perpendicular to each other, comprising containing box, hot-pressing mechanism, first pipeline and second pipeline;

[0006] The containing box has containing cavity for placing electrode assembly;

[0007] The top of the containing box is provided with the hot-pressing mechanism, and the output end of the hot-pressing mechanism can extend into the containing cavity for compacting the electrode assembly;

[0008] One end of the first pipeline is communicated with the containing cavity, and the other end extends out of the containing box for connecting with vacuum generating device;

[0009] One end of the second pipeline is communicated with the containing cavity, and the other end extends out of the containing cavity for connecting with heating gas supply device.

[0010] Further, the containing box includes a box body and a box door, the box body is provided with the containing cavity, one end of the containing cavity in the first direction is provided with an opening, and the box door is movably connected to the box body and used to close the opening.

[0011] Further, the box is provided with a mounting groove corresponding to the box door, the mounting groove extends from the bottom surface of the accommodating cavity to the top of the box in the vertical direction, and the box door is movably arranged in the mounting groove.

[0012] Further, the box door comprises a top plate, a main body and a sealing ring, one end of the main body in the vertical direction is connected with the top plate, the other end can be inserted into the mounting groove and extend into the accommodating cavity, and the main body is sleeved with the sealing ring, the sealing ring is located below the top plate, and a sealing strip is arranged in the mounting groove.

[0013] When the box door closes the opening, the two side surfaces of the sealing ring in the vertical direction abut against the bottom surface of the top plate and the top surface of the box respectively, and the outer wall of the main body abuts against the sealing strip.

[0014] Further, the accommodating cavity is provided with a first hot pressing plate for placing the electrode assembly, and a plurality of positioning columns are arranged on the first hot pressing plate.

[0015] Further, the top surface of the first hot pressing plate is provided with a first protective layer for contacting the surface of the electrode assembly.

[0016] Further, the hot pressing mechanism comprises a driving motor, a second hot pressing plate and a plurality of guide plates, the driving motor is fixedly arranged on the top of the accommodating box, the output end of the driving motor is connected with the second hot pressing plate and extends into the accommodating cavity, the second hot pressing plate is provided with a sliding groove at both ends in the second direction, and the two opposite side walls of the accommodating cavity in the second direction are provided with the guide plates corresponding to the sliding groove.

[0017] Further, the bottom of the second hot pressing plate is provided with a second protective layer for contacting the surface of the electrode assembly.

[0018] Further, the accommodating cavity is provided with a temperature sensor.

[0019] Further, the second pipeline is configured to be able to transmit a gas with a temperature of 25-120℃ into the accommodating cavity.

[0020] Compared with the prior art, the electrode assembly battery hot-pressing device of this utility model has the following advantages: The housing has a cavity for holding the electrode assembly. A hot-pressing mechanism is provided on the top of the housing, and the output end of the hot-pressing mechanism can extend into the cavity to compact the electrode assembly. One end of the first pipe is connected to the cavity, and the other end extends outside the housing for connecting to a vacuum generator. One end of the second pipe is connected to the cavity, and the other end extends outside the cavity for connecting to a heating gas supply device. When the electrode assembly is hot-pressed in the cavity, the cold air in the cavity is discharged through the first pipe and the vacuum generator, and heating gas is introduced into the cavity through the second pipe and the heating gas supply device. Then, the hot-pressing mechanism operates to hot-press the electrode assembly, eliminating the influence of the external environment on the hot-pressing process. Simultaneously, it can rapidly heat the electrode assembly, improving hot-pressing efficiency and enhancing the consistency of hot-pressing between the inner and outer rings of thicker electrode assemblies, thus improving battery stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the electrode assembly hot pressing device according to an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the receiving box of the electrode assembly hot pressing device according to an embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of the electrode assembly hot pressing device according to an embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional view of the electrode assembly hot pressing device according to another embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the door of the electrode assembly hot pressing device according to an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the installation of the second hot-pressing plate of the electrode assembly hot-pressing device according to an embodiment of this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the first hot-pressing plate of the electrode assembly hot-pressing device according to an embodiment of the present invention.

[0028] In the figure, 1 is the receiving box; 100 is the receiving cavity; 11 is the box body; 111 is the mounting groove; 112 is the sealing strip; 1121 is the sealing groove; 12 is the box door; 121 is the top plate; 122 is the main body; 123 is the sealing ring; 2 is the hot pressing mechanism; 21 is the drive motor; 22 is the second hot pressing plate; 221 is the slide groove; 23 is the guide plate; 3 is the first pipe; 4 is the second pipe; 5 is the first hot pressing plate; 51 is the positioning post; a is the electrode assembly; X is the first direction; Y is the second direction. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer" and other terms used in this utility model to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device and element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0032] like Figures 1 to 7 As shown, a preferred embodiment of the electrode assembly hot pressing device of this utility model has a first direction X and a second direction Y that intersect perpendicularly in pairs, including a receiving box 1, a hot pressing mechanism 2, a first pipe 3, and a second pipe 4. The receiving box 1 has a receiving cavity 100 inside for placing the electrode assembly a. The hot pressing mechanism 2 is located on the top of the receiving box 1, and its output end extends into the receiving cavity 100 to compact the electrode assembly a. To prevent heat loss from the electrode assembly a to the surrounding environment during the hot pressing process, and to improve the heating efficiency of the electrode assembly a, thereby increasing the hot pressing efficiency, one end of the first pipe 3 is connected to the receiving cavity 100, and the other end extends outside the receiving box 1 to connect to a vacuum generator. The vacuum generator is used to extract the cold air inside the receiving cavity 100. One end of the second pipe 4 is connected to the receiving cavity 100, and the other end extends to the outside of the receiving cavity 100 for connecting to the heating gas supply device. The heating gas supply device is used to input heating gas with a certain temperature into the receiving cavity 100. The heating gas is a gas with a thermal conductivity greater than that of air (thermal conductivity is 0.026W / (m*K)). Specifically, the heating gas can be helium (thermal conductivity is 0.15W / (m*K)), which can quickly increase the temperature inside the receiving cavity 100, promote the heating of the electrode assembly a, and improve the hot pressing efficiency.

[0033] Further, since the diaphragm closing temperature is between 128℃ and 135℃, the heating gas supply device can supply gas with a temperature between 25℃ and 120℃ to the accommodating cavity 100 through the second pipeline 4, which is less than the diaphragm closing temperature, so as to avoid changing the performance of the diaphragm.

[0034] Specifically, when the electrode assembly a is subjected to hot pressing in the accommodating cavity 100, the cold air in the accommodating cavity 100 is discharged through the first pipeline 3 and the vacuum generating device, and the heating gas is input into the accommodating cavity 100 through the second pipeline 4 and the heating gas supply device, and then the hot pressing mechanism 2 is actuated to hot press the electrode assembly a, so as to eliminate the influence of the external environment on the hot pressing process of the electrode assembly a, and the electrode assembly a can be rapidly heated, the hot pressing efficiency is improved, the consistency of the hot pressing of the inner and outer circles of the thick electrode assembly a is improved, and the stability of the battery is improved.

[0035] Further, in order to facilitate the placement of the electrode assembly a into the accommodating cavity 100, referring to Figures 1 to 3 , the accommodating box 1 comprises a box body 11 and a box door 12, the box body 11 is provided with the accommodating cavity 100, one end of the accommodating cavity 100 in the first direction X is provided with an opening, the box door 12 is movably connected to the box body 11 and is used to close the opening and seal the accommodating cavity 100. In order to facilitate the positioning of the box door 12 and the box body 11 during installation, the box body 11 is provided with an installation groove 111 corresponding to the box door 12, the installation groove 111 extends from the bottom surface of the accommodating cavity 100 to the top of the box body 11 in the vertical direction, and the box door 12 is movably arranged in the installation groove 111. Further, in order to facilitate the cooperation of the box body 11 and the box door 12 to seal the accommodating cavity 100, the box door 12 comprises a top plate 121, a main body 122 and a sealing ring 123, wherein, referring to Figures 1 to 5 , one end of the main body 122 in the vertical direction is connected to the top plate 121, the other end can be inserted into the installation groove 111 to extend into the accommodating cavity 100, and the main body 122 is provided with the sealing ring 123, the sealing ring 123 is located below the top plate 121, the installation groove 111 is provided with a sealing strip 112, the sealing strip 112 is provided with a sealing groove 1121 corresponding to the shape of the main body 122, when the box door 12 closes the opening, the two side surfaces of the sealing ring 123 in the vertical direction are respectively abutted with the bottom surface of the top plate 121 and the top surface of the box body 11, and the outer wall of the main body 122 is abutted with the sealing strip 112, so as to seal the accommodating cavity 100.

[0036] Further, in order to facilitate the placement and positioning of the electrode assembly a, avoid the position of the electrode assembly a moving during the hot pressing process, the accommodating cavity 100 is provided with a first hot pressing plate 5 for placing the electrode assembly a, the first hot pressing plate 5 is provided with a plurality of positioning columns 51, the plurality of positioning columns 51 are arranged at intervals in the first direction X and the second direction Y, in order to facilitate the placement of the electrode assembly a between the plurality of positioning columns 51, the top of the positioning column 51 is provided with a guide inclined surface. The first hot pressing plate 5 is made of heat-conducting material and can be connected with heating elements such as heating rods to support and heat the electrode assembly a. In order to avoid scratching the surface of the electrode assembly a during the hot pressing process of the electrode assembly a, the top surface of the first hot pressing plate 5 is provided with a first protective layer for contacting the surface of the electrode assembly a, which can be a Teflon tape directly attached to the top surface of the first hot pressing plate 5.

[0037] Further, in order to simplify the structure of the hot pressing mechanism 2, refer to Figures 3 to 6 , the hot pressing mechanism 2 includes a driving motor 21, a second hot pressing plate 22 and a plurality of guide plates 23, wherein the driving motor 21 is fixedly arranged on the top of the accommodating box 1 and the output end extends into the accommodating cavity 100, the output end of the driving motor 21 is connected with the second hot pressing plate 22, the driving motor 21 is started to drive the second hot pressing plate 22 to rise and fall in the vertical direction, and cooperates with the first hot pressing plate 5 to hot press the electrode assembly a. In order to facilitate the guidance of the second hot pressing plate 22 when it rises and falls, the second hot pressing plate 22 is provided with a sliding groove 221 at both ends in the second direction Y, and the opposite side walls of the accommodating cavity 100 in the second direction Y are provided with guide plates 23 corresponding to the sliding grooves 221, that is, the guide plates 23 are clamped in the sliding grooves 221, so as to realize the guidance and positioning of the second hot pressing plate 22 when it rises and falls, and ensure the stability of the hot pressing mechanism 2. In order to avoid scratching the surface of the electrode assembly a during the hot pressing process of the electrode assembly a, the bottom of the second hot pressing plate 22 is provided with a second protective layer for contacting the surface of the electrode assembly a. The second protective layer can also be a Teflon tape attached to the bottom surface of the second hot pressing plate 22.

[0038] Further, in order to facilitate the control of the temperature during the hot pressing process of the electrode assembly a, the accommodating cavity 100 is provided with a temperature sensor, and the first hot pressing plate 5 and the second hot pressing plate 22 are both provided with thermocouples for monitoring the temperature. The temperatures of the three should be kept consistent as much as possible to make the hot pressing process of the electrode assembly a stable.

[0039] In conclusion, the electrode assembly battery hot pressing device provided by the embodiment of the utility model, the containing box 1 has the containing cavity 100, for placing the electrode assembly a, the top of the containing box 1 is equipped with the hot pressing mechanism 2, the output end of the hot pressing mechanism 2 extends to the containing cavity 100 inside, for compacting the electrode assembly a, one end of the first pipeline 3 is communicated with the containing cavity 100, the other end extends to the containing box 1 outside and is connected with the vacuum generating device, one end of the second pipeline 4 is communicated with the containing cavity 100, the other end extends to the containing cavity 100 outside and is connected with the heated gas supply device, when the electrode assembly a is hot pressed in the containing cavity 100, the cold air in the containing cavity 100 is discharged through the first pipeline 3 and the vacuum generating device, then the heated gas is inputted into the containing cavity 100 through the second pipeline 4 and the heated gas supply device, then the hot pressing mechanism 2 acts, the electrode assembly a is hot pressed, the influence of external environment on the hot pressing process of the electrode assembly a is excluded, at the same time, the electrode assembly a can be rapidly heated, the hot pressing efficiency is improved, the consistency of the inner ring and the outer ring of the thicker electrode assembly a is improved, and the stability of the battery is improved.

[0040] The above only is the preferred implementation of the utility model, should point out, for the ordinary skill in the art, on the premise of not departing from the technical principle of the utility model, can make several improvements and substitutions, these improvements and substitutions also should be considered as the protection scope of the utility model.

Claims

1. An electrode assembly hot press apparatus having a first direction and a second direction that each perpendicularly intersect the other, characterized by: The application relates to a heat pressing device for electrode assembly, which comprises a containing box, a heat pressing mechanism, a first pipeline and a second pipeline. The containing box is provided with a containing cavity for placing an electrode assembly. The top of the containing box is provided with the heat pressing mechanism, and the output end of the heat pressing mechanism can extend into the containing cavity for compacting the electrode assembly. One end of the first pipeline is communicated with the containing cavity, and the other end extends out of the containing box for connecting a vacuum generating device. One end of the second pipeline is communicated with the containing cavity, and the other end extends out of the containing cavity for connecting a heated gas supply device.

2. The electrode assembly hot press apparatus of claim 1, wherein: The containing box comprises a box body and a box door, the box body is internally provided with the containing cavity, one end of the containing cavity in the first direction is provided with an opening, and the box door is movably connected to the box body and used for closing the opening.

3. The electrode assembly hot press apparatus of claim 2, wherein: The box body is provided with a mounting groove corresponding to the box door, the mounting groove extends from the bottom surface of the containing cavity to the top of the box body in the vertical direction, and the box door is movably arranged in the mounting groove.

4. The electrode assembly hot press apparatus of claim 3, wherein: The box door comprises a top plate, a main body and a sealing ring, one end of the main body in the vertical direction is connected to the top plate, the other end can be inserted into the mounting groove and extend into the containing cavity, the main body is externally provided with the sealing ring, the sealing ring is located below the top plate, and a sealing strip is arranged in the mounting groove. When the box door closes the opening, the two side surfaces of the sealing ring in the vertical direction are respectively abutted against the bottom surface of the top plate and the top surface of the box body, and the outer wall of the main body is abutted against the sealing strip.

5. The electrode assembly hot press apparatus of claim 1, wherein: The containing cavity is internally provided with a first heat pressing plate for placing the electrode assembly, the first heat pressing plate is provided with a plurality of positioning columns, and the positioning columns are arranged in the first direction and the second direction.

6. The electrode assembly hot press apparatus of claim 5, wherein: The top surface of the first heat pressing plate is provided with a first protective layer for contacting the surface of the electrode assembly.

7. The electrode assembly hot press apparatus of claim 5, wherein: The heat pressing mechanism comprises a driving motor, a second heat pressing plate and a plurality of guide plates, the driving motor is fixedly arranged on the top of the containing box, the output end of the driving motor is connected with the second heat pressing plate and extends into the containing cavity, the second heat pressing plate is provided with a sliding groove at the two ends in the second direction, and the opposite two side walls of the containing cavity in the second direction are provided with the guide plates corresponding to the sliding grooves.

8. The electrode assembly hot press apparatus of claim 7, wherein: The bottom of the second heat pressing plate is provided with a second protective layer for contacting the surface of the electrode assembly.

9. The electrode assembly hot press apparatus of claim 1, wherein: The containing cavity is internally provided with a temperature sensor.

10. The electrode assembly hot press apparatus of claim 1, wherein: The second pipeline is configured to transmit gas with a temperature of 25-120 DEG C into the containing cavity.

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