Battery monomer heating device

Abstract

The embodiment of the utility model provides a battery monomer heating device, and relates to the field of new energy batteries. The battery monomer heating device comprises a first heating piece and a second heating piece. The first heating piece is provided with a first heating surface, and the second heating piece is provided with a second heating surface. And the first heating piece and the second heating piece can move relatively, so that the first heating surface and the second heating surface can be respectively attached to different outer surfaces of the battery monomer so as to heat the battery monomer. The battery monomer heating device can directly heat the battery monomer, so that gas in the battery monomer is exhausted after being heated, and the infiltration effect of electrolyte and the liquid injection speed are improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of new energy batteries, and in particular to a battery monomer heating device. BACKGROUND

[0002] Electrolyte injection is an important process in the production of lithium ion batteries, but there are pores between the particles of the electrode sheet, and bubbles are easily formed between the electrolyte and the electrode material during injection, which can affect the direct contact of the electrolyte with the electrode material, resulting in poor wettability of the electrolyte, and further affecting the production efficiency of the battery and the performance of the battery. Therefore, the bubbles must be effectively removed during electrolyte injection.

[0003] In the prior art, the electrolyte is usually heated before being injected into the battery monomer, such as heating and keeping warm of the electrolyte on the electrolyte storage device and the pipeline, and then repeatedly vacuumizing and vibrating and patting the inside of the battery monomer, so as to remove the bubbles between the electrolyte and the electrode sheet.

[0004] However, in this bubble removal method, the heated electrolyte is prone to cool down when flowing, and the temperature of the electrolyte injected into the battery monomer is unstable, which cannot guarantee that the electrolyte always has good fluidity, and can easily lead to insufficient bubble removal. Therefore, how to more stably heat the electrolyte has become a technical problem to be solved. UTILITY MODEL CONTENT

[0005] In view of the above problems, the embodiments of the present application provide a battery monomer heating device, which comprises a first heating member and a second heating member. The first heating surface of the first heating member and the second heating surface of the second heating member can respectively abut on different outer surfaces of the battery monomer, so as to directly heat the battery monomer, so that the gas in the battery monomer is discharged after being heated. At the same time, the temperature in the battery monomer can be guaranteed to be stable, and the temperature of the electrolyte injected into the battery monomer can be stable during injection, which guarantees the high fluidity of the electrolyte, makes the bubbles more easily removed, and is beneficial to improving the wettability of the electrolyte and improving the injection speed.

[0006] In one aspect of the embodiments of the present application, a battery monomer heating device is provided, which comprises a first heating member and a second heating member. The first heating member has a first heating surface, and the second heating member has a second heating surface. The first heating member and the second heating member are relatively movable, so that the first heating surface and the second heating surface can respectively abut on different outer surfaces of the battery monomer, so as to heat the battery monomer.

[0007] The battery cell heating device can directly heat the battery cell, so that the gas in the battery cell is discharged after being heated. Meanwhile, the temperature in the battery cell can be stabilized, and the temperature of the electrolyte injected into the battery cell can be stabilized during liquid injection, so that the high fluidity of the electrolyte is ensured, the bubbles are more easily fully discharged, the liquid injection effect is improved, and the liquid injection speed is improved. Meanwhile, the electrolyte is not easy to volatilize during heating, and the safety is higher. In addition, the battery cell heating device has simple structure, low cost, and simple heating operation during liquid injection.

[0008] In an optional manner, the first heating surface and the second heating surface are opposite, so that the first heating surface and the second heating surface can be respectively attached to the opposite two outer surfaces of the battery cell.

[0009] In this manner, the first heating surface and the second heating surface are respectively attached to the opposite two outer surfaces of the battery cell, so that the first heating surface and the second heating surface can heat the battery cell from opposite sides, so that the temperature in the battery cell can be uniformly distributed through double-sided heating, and the local overheating or overcooling is avoided. Meanwhile, heat can be simultaneously transmitted from the opposite two outer surfaces of the battery cell to the inside of the battery cell, so that the heating rate can be improved, and the heating time can be shortened.

[0010] In an optional manner, the contact area of the first heating surface with the battery cell accounts for 60%-100% of the area of the outer surface attached by the first heating surface.

[0011] In this manner, the contact area of the first heating surface with the battery cell is set in a reasonable range, so that the first heating surface can sufficiently heat the inside of the battery cell, and the structure size of the first heating surface can be optimized, and the occupied space of the first heating surface can be reduced.

[0012] In an optional manner, the contact area of the second heating surface with the battery cell accounts for 60%-100% of the area of the outer surface attached by the second heating surface.

[0013] In this manner, the setting manner of the second heating surface is the same as that of the first heating surface. The contact area of the second heating surface with the battery cell is set in a reasonable range, so that the second heating surface can sufficiently heat the inside of the battery cell, and the structure size of the second heating surface can be optimized, and the occupied space of the second heating surface can be reduced.

[0014] In an optional manner, the first heating surface applies a pressure of 0.02-0.1 MPa to the outer surface attached by the first heating surface.

[0015] In this way, the first heating surface applies appropriate pressure to the outer surface on which the first heating surface is attached, enhancing the tightness of the contact between the first heating surface and the battery monomer, making the temperature distribution of the first heating surface when heated more uniform, and the heat transfer efficiency higher. At the same time, this way can avoid excessive pressure causing damage to the first heating element and the battery monomer, and is also convenient to install.

[0016] In an alternative way, the second heating surface applies a pressure of 0.02-0.1 MPa to the outer surface on which the second heating surface is attached.

[0017] In this way, the second heating surface applies appropriate pressure to the outer surface on which the second heating surface is attached, enhancing the tightness of the contact between the second heating surface and the battery monomer, making the temperature distribution of the second heating surface when heated more uniform, and the heat transfer efficiency higher. At the same time, this way can avoid excessive pressure causing damage to the second heating element and the battery monomer, and is also convenient to install.

[0018] In an alternative way, the battery monomer heating device further comprises a third heating element, and the third heating element has a third heating surface. The first heating surface, the second heating surface and the third heating surface can be attached to different outer surfaces of the battery monomer respectively.

[0019] In this way, the first heating surface, the second heating surface and the third heating surface are attached to three outer surfaces of the battery monomer that are sequentially adjacent, and when heating the battery monomer, one or more heating surfaces can be selectively enabled to achieve the best heating effect, and heating is more flexible. When heating the battery monomer from three directions at the same time, the heating efficiency and uniformity are higher, which helps to shorten the heating time and improve the production efficiency.

[0020] In an alternative way, the first heating surface and the second heating surface are opposite, and the orientation of the third heating surface is perpendicular to the orientation of the first heating surface and the orientation of the second heating surface, so that the first heating surface, the second heating surface and the third heating surface can be attached to three outer surfaces of the battery monomer that are sequentially adjacent.

[0021] In this way, the three heating surfaces are adjacent to each other, facilitating their respective alignment and placement, and when the three heating surfaces work at the same time, heat can be transferred to the inside of the battery monomer from three different directions at the same time, the heating efficiency and uniformity are higher, and the occurrence of local overheating or overcooling can be effectively avoided.

[0022] In an alternative way, the first heating element, the second heating element and the third heating element are all relatively movable.

[0023] This way is convenient for flexible adjustment of the positions of the first heating element, the second heating element and the third heating element, so as to meet different heating needs and temperature distribution requirements by adjusting the positions and angles of the heating elements.

[0024] The battery cell heating device provided by the embodiments of the present application is characterized in that the first heating member and the second heating member are movable relative to each other, and the first heating surface of the first heating member and the second heating surface of the second heating member can be respectively attached to different outer surfaces of the battery cell, so that the battery cell is directly heated, and the gas in the battery cell is discharged after being heated. Meanwhile, the temperature in the battery cell can be stabilized, and the temperature of the electrolyte injected into the battery cell can be stabilized during liquid injection, so that the high fluidity of the electrolyte is ensured, the bubbles are more easily fully discharged, the impregnation effect of the electrolyte is improved, and the liquid injection speed is improved. Meanwhile, the electrolyte injected into the battery cell is continuously heated, and the electrolyte is less likely to volatilize during the heating process, so that the safety is higher. In addition, the battery cell heating device has a simple structure, a low cost, and a simpler heating operation during liquid injection.

[0025] The above description is only a summary of the technical solutions of the embodiments of the present application, and the technical solutions can be implemented according to the content of the description. In order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0027] Figure 1 A structural schematic diagram of a battery cell heating device provided by the embodiments of the present application.

[0028] Figure 2 A structural schematic diagram of the battery cell heating device provided by the embodiments of the present application when the third heating member is arranged in the battery cell heating device.

[0029] REFERENCE SIGNS

[0030] 10, first heating member; 11, first heating surface; 20, second heating member; 21, second heating surface; 30, third heating member; 31, third heating surface; 40, battery cell. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0033] The terms "comprise", "have" and any variations thereof in the present specification and claims and the accompanying drawings are intended to cover both non-exclusive inclusion and exclusive inclusion, unless otherwise defined. The word "a" or "an" does not exclude the presence of more than one.

[0034] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. A person of ordinary skill in the art will readily recognize from the description herein that embodiments described as performing certain actions are equally applicable to a system for performing the actions.

[0035] The term "and / or" in the present application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0036] The orientation words appearing in the following description are the directions shown in the drawings, and do not limit the specific structure of the battery cell heating device of the present application. For example, in the description of the present application, the orientation or position relationship indicated by the terms "center", "lengthwise", "widthwise", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, the expressions of the indicating directions for explaining the operation and configuration of each component of the battery cell heating device of the present embodiment, such as the X direction, the Y direction, and the Z direction, are not absolute but relative, and although these indications are appropriate when each component of the battery cell heating device is in the position shown in the figure, these directions should be interpreted differently to correspond to the change when the positions are changed.

[0038] In addition, the terms "first", "second", and the like in the description and claims of the present application or the above-mentioned drawings are used to distinguish different objects, and are not used to describe a specific order, and can explicitly or implicitly include one or more of the features.

[0039] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0040] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", and "connecting" should be understood broadly, for example, the "connecting" or "connecting" of the mechanical structure can mean a physical connection, for example, the physical connection can be a fixed connection, for example, a fixed connection through a fixing member, for example, a fixed connection through a screw, a bolt or other fixing member; the physical connection can also be a detachable connection, for example, a mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection for connection. The "connecting" or "connecting" of the circuit structure can mean a physical connection, an electrical connection or a signal connection, for example, it can be directly connected, that is, a physical connection, or indirectly connected through at least one intermediate element, as long as the circuit is connected, it can also be the connection between the two elements inside; signal connection can be signal connection through circuit, or signal connection through media medium, for example, radio wave. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The battery cell heating device of the present application embodiment is as shown in Figure 1 The battery cell heating device of the present application embodiment is as shown in Figure 1 A structural schematic diagram of a battery cell heating device provided by the present application embodiment. Wherein, the battery cell heating device comprises a first heating member 10 and a second heating member 20.

[0042] The first heating member 10 and the second heating member 20 are two separate components for heating the battery cell 40, and each of the first heating member 10 and the second heating member 20 is provided with a heating element to provide heat for the battery cell 40. The heating element on the first heating member 10 and the second heating member 20 can be a heating element such as a resistance wire or an electric heating film that generates heat by electricity, or a heating element that exchanges heat by a high-temperature fluid, which is not limited herein.

[0043] The first heating member 10 has a first heating surface 11, and the second heating member 20 has a second heating surface 21. The first heating surface 11 and the second heating surface 21 are used to abut against the outer surface of the battery cell 40 to transfer heat to the battery cell 40 through the contact between the surfaces, so as to heat the inside of the battery cell 40 and make the air inside the battery cell 40 expand to be discharged.

[0044] The first heating surface 11 and the second heating surface 21 can be made of a high-thermal-conductivity material, such as a metal alloy, graphite, or a thermal-conductivity plastic, to ensure that heat can be quickly and uniformly transferred to the battery cell 40. The profile of the first heating surface 11 and the second heating surface 21 matches the profile of the outer surface of the battery cell 40, which can be a plane, a curved surface, or other shapes, as long as the first heating surface 11 and the second heating surface 21 can abut against the outer surface of the battery cell 40.

[0045] The first heating member 10 and the second heating member 20 are relatively movable, so that the first heating surface 11 and the second heating surface 21 can abut against different outer surfaces of the battery cell 40 to heat the battery cell 40.

[0046] The relative movement between the first heating member 10 and the second heating member 20 can be achieved by sliding, rotating, telescopic movement, or the like, to move the first heating member 10 and the second heating member 20 to abut against the outer surface of the battery cell 40.

[0047] The relative movement of the first heating member 10 and the second heating member 20 can be achieved by various connection structures, such as a slide rail to achieve the relative movement of the first heating member 10 and the second heating member 20, a rotating shaft to achieve the relative rotation of the first heating member 10 and the second heating member 20, or a detachable clamping structure to achieve the free disassembly of the first heating member 10 and the second heating member 20 to freely move, which is not limited herein.

[0048] When the battery cell heating device is used, the battery cell 40 is first placed in a preset position, and then the first heating member 10 and the second heating member 20 are moved to make the first heating member 10 and the second heating member 20 relatively move, so that the first heating surface 11 and the second heating surface 21 are tightly attached to different outer surfaces of the battery cell 40, and then the first heating member 10 and the second heating member 20 are started to preheat, so as to directly heat the battery cell 40, so that the gas in the battery cell 40 is heated and discharged. The preheating time and the preheating temperature can be freely set according to requirements, for example, the preheating time can be set to 5-10 minutes, and the preheating temperature can be set to 45-95°C.

[0049] After preheating, electrolyte is injected into the battery cell 40, and the working state of the first heating member 10 and the second heating member 20 is maintained, so that the injected electrolyte in the battery cell 40 is continuously heated and the temperature is stabilized. After the initial injection is completed, the vacuumizing and pressure injection can be performed in a cycle, so as to complete the entire injection process.

[0050] Since the first heating surface 11 of the first heating member 10 and the second heating surface 21 of the second heating member 20 can be attached to different outer surfaces of the battery cell 40 respectively, the battery cell 40 can be directly heated from two directions, so that the gas in the battery cell 40 is heated and discharged. At the same time, the temperature in the battery cell 40 can be stabilized, and the temperature of the injected electrolyte in the battery cell 40 can be stabilized during injection, so as to ensure the high flowability of the electrolyte, make the bubbles more easily be fully discharged, improve the impregnation effect of the electrolyte and the injection speed, reduce the uneven charging interface of the electrode sheet due to poor impregnation, reduce the probability of occurrence of negative black spots and lithium precipitation, and improve the battery capacity consistency. At the same time, the electrolyte injected into the battery cell 40 is continuously heated, and the electrolyte is not easy to volatilize in the air during the heating process, so the safety is higher. Moreover, the heating area of the battery cell heating device is small, the overall structure is compact and simple, the occupied space is small, and the heating operation during injection is more simple.

[0051] In the embodiment, the structures of the first heating member 10 and the second heating member 20 can be the same or different. The structures and profiles of the first heating surface 11 and the second heating surface 21 can be the same or different, which is not limited herein. Of course, the orientations of the first heating surface 11 and the second heating surface 21 need to be different, so that the first heating surface 11 and the second heating surface 21 can be attached to different outer surfaces of the battery cell 40 respectively, so as to heat the battery cell 40 from multiple positions, so that the battery cell 40 can be more fully heated.

[0052] For example, an optional mode is as follows: Figure 1As shown, the first heating surface 11 and the second heating surface 21 are opposite, so that the first heating surface 11 and the second heating surface 21 can be attached to the opposite two outer surfaces of the battery monomer 40 respectively.

[0053] In the embodiment, the first heating surface 11 and the second heating surface 21 can be relatively close or relatively far away, so as to realize the relative movement of the first heating member 10 and the second heating member 20. The outer surfaces attached by the first heating surface 11 and the second heating surface 21 can be the two opposite outer surfaces with the largest surface area on the battery monomer 40, or can be the two opposite outer surfaces with smaller surface area, which is not limited herein.

[0054] In this way, the first heating surface 11 and the second heating surface 21 are attached to the opposite two outer surfaces of the battery monomer 40 respectively, so that the first heating surface 11 and the second heating surface 21 can heat the battery monomer 40 from both sides, so as to ensure that the temperature inside the battery monomer 40 is evenly distributed through the double-sided heating mode, and the local overheating or overcooling condition is avoided. At the same time, the heat can be transmitted from the opposite two outer surfaces of the battery monomer 40 to the inside of the battery monomer 40 at the same time, so as to improve the heating rate and shorten the heating time.

[0055] In the embodiment, when the first heating surface 11 and the second heating surface 21 are attached to the outer surfaces of the battery monomer 40, the contact area also affects the heating efficiency.

[0056] In an optional way, the contact area of the first heating surface 11 and the battery monomer 40 can account for 60%-100% of the outer surface area attached by the first heating surface 11. That is, the area of the first heating surface 11 can be greater than or equal to the outer surface area attached by the first heating surface 11, so that the contact area of the first heating surface 11 and the battery monomer 40 accounts for 100% of the outer surface area attached by the first heating surface 11. The area of the first heating surface 11 can also be smaller than the outer surface area attached by the first heating surface 11, and the area of the first heating surface 11 accounts for 60% or more of the outer surface area attached by the first heating surface 11, so as to reduce the occupied space of the first heating member 10 while ensuring the heating effect.

[0057] In this way, the contact area of the first heating member 10 and the battery monomer 40 is set within a reasonable range, which can not only enable the first heating member 10 to fully heat the inside of the battery monomer 40, but also optimize the structure size of the first heating member 10 and reduce the occupied space of the first heating member 10.

[0058] Similarly, in another feasible way, the contact area of the second heating surface 21 and the battery monomer 40 can account for 60%-100% of the outer surface area attached by the second heating surface 21.

[0059] In this mode, the arrangement mode of the second heating surface 21 is the same as the arrangement mode of the first heating surface 11. The contact area between the second heating element 20 and the battery monomer 40 is arranged within a reasonable range, which can enable the second heating element 20 to sufficiently heat the inside of the battery monomer 40, and can optimize the structure size of the second heating element 20 and reduce the occupied space of the second heating element 20.

[0060] It should be noted that the contact area between the first heating surface 11 and the battery monomer 40 and the contact area between the second heating surface 21 and the battery monomer 40 can be the same or different, and can be adaptively arranged according to different requirements, which is not specifically limited here.

[0061] In this embodiment, in order to ensure the close fit between the heating surface and the battery monomer 40, a pressure adjusting mechanism or an elastic element can be arranged on the first heating element 10 and the second heating element 20, so as to apply appropriate pressure to the heating surface, so as to eliminate the gap between the first heating surface 11 and the outer surface of the battery monomer 40 and eliminate the gap between the second heating surface 21 and the outer surface of the battery monomer 40.

[0062] When the first heating surface 11 and the second heating surface 21 press the outer surface of the battery monomer 40, the pressure can be set according to specific requirements. For example, in an optional mode, the first heating surface 11 applies a pressure of 0.02-0.1 MPa to the outer surface abutting against the first heating surface 11.

[0063] In this mode, the first heating surface 11 applies appropriate pressure to the outer surface abutting against the first heating surface 11, which enhances the close contact between the first heating surface 11 and the battery monomer 40, so that the temperature distribution of the first heating surface 11 is more uniform when heated, and the heat transfer efficiency is higher. At the same time, this mode can avoid excessive pressure from damaging the first heating element 10 and the battery monomer 40, and is also convenient to install.

[0064] Similarly, in another optional mode, the second heating surface 21 can apply a pressure of 0.02-0.1 MPa to the outer surface abutting against the second heating surface 21.

[0065] In this mode, the second heating surface 21 applies appropriate pressure to the outer surface abutting against the second heating surface 21, which enhances the close contact between the second heating surface 21 and the battery monomer 40, so that the temperature distribution of the second heating surface 21 is more uniform when heated, and the heat transfer efficiency is higher. At the same time, this mode can avoid excessive pressure from damaging the second heating element 20 and the battery monomer 40, and is also convenient to install.

[0066] And, the pressure applied by the first heating surface 11 to the outer surface on which the first heating surface 11 is attached and the pressure applied by the second heating surface 21 to the outer surface on which the second heating surface 21 is attached can be the same or different, and are not limited herein.

[0067] In addition, in the present embodiment, temperature sensors, temperature controllers and other components can also be arranged on the first heating member 10 and the second heating member 20 to detect the temperature of the first heating surface 11 and the second heating surface 21 in real time and accurately control the heating process, so as to ensure that the heating process can maintain an appropriate temperature range and avoid over-heating or over-cooling affecting the liquid injection effect.

[0068] In the present embodiment, in addition to heating the battery monomer 40 by the first heating member 10 and the second heating member 20, more heating members can also be arranged to attach to the outer surface of the battery monomer 40, so as to further improve the heating effect.

[0069] For example, an optional way is as shown in Figure 2 Figure 2 is a structural schematic view of the battery monomer heating device according to the present application when a third heating member is arranged. The battery monomer heating device further comprises a third heating member 30, and the third heating member 30 has a third heating surface 31. The first heating surface 11, the second heating surface 21 and the third heating surface 31 can respectively attach to different outer surfaces of the battery monomer 40.

[0070] The third heating member 30 is an independent heating member different from the first heating member 10 and the second heating member 20, and the structure and arrangement manner of the third heating member 30 are similar to those of the first heating member 10 and the second heating member 20, but can be specifically arranged according to the specific application scene and requirements. That is, the structure form and size of the third heating member 30 can be the same as or completely different from those of the first heating member 10 or the second heating member 20.

[0071] The third heating member 30 also has a heating surface, i.e., the third heating surface 31, to heat a certain outer surface of the battery monomer 40. The specific arrangement manner of the third heating surface 31 is similar to those of the first heating surface 11 and the second heating surface 21.

[0072] For example, the contact area of the third heating surface 31 with the battery monomer 40 can be further arranged, such as allowing the contact area of the third heating surface 31 with the battery monomer 40 to account for 60%-100% of the area of the outer surface on which the third heating surface 31 is attached. The third heating surface 31 can also apply a certain pressure to the battery monomer 40 to ensure reliable contact, for example, the third heating surface 31 can apply a pressure of 0.02-0.1 MPa to the outer surface on which the third heating surface 31 is attached.

[0073] ​In this mode, the first heating surface 11, the second heating surface 21 and the third heating surface 31 are respectively attached to three outer surfaces of the battery monomer 40 which are sequentially adjacent, and when heating the battery monomer 40, one or more heating surfaces can be selectively activated to achieve the best heating effect and more flexible heating. When heating the battery monomer 40 from three directions at the same time, the heating efficiency and uniformity are higher, which helps to shorten the heating time and improve the production efficiency.

[0074] In this mode, the orientations of the first heating surface 11, the second heating surface 21 and the third heating surface 31 should be different from each other, so that each heating surface can be attached to a different outer surface of the battery monomer 40. For example, an optional mode is shown in Figure 2 The first heating surface 11 and the second heating surface 21 are opposite to each other, and the orientation of the third heating surface 31 is perpendicular to the orientations of the first heating surface 11 and the second heating surface 21, so that the first heating surface 11, the second heating surface 21 and the third heating surface 31 can be respectively attached to three outer surfaces of the battery monomer 40 which are sequentially adjacent.

[0075] The first heating surface 11 and the second heating surface 21 are in opposite positions in space, and the orientation of the third heating surface 31 is perpendicular to the orientations of the first heating surface 11 and the second heating surface 21, and this positional relationship ensures that the third heating surface 31 can be attached to three outer surfaces of the battery monomer 40 which are sequentially adjacent.

[0076] For example, the first heating surface 11 and the second heating surface 21 can be respectively attached to two opposite sides of the battery monomer 40, and the third heating surface 31 can be attached to the bottom surface of the battery monomer 40 which is adjacent to the two opposite sides, so as to heat the battery monomer 40 from three surfaces, thereby further improving the heating effect.

[0077] In this mode, the three heating surfaces are adjacent to each other, which is convenient for alignment and placement, and when the three heating surfaces work at the same time, heat can be transmitted to the inside of the battery monomer 40 from three different directions at the same time, the heating efficiency and uniformity are higher, and the situation of local overheating or overcooling can be effectively avoided.

[0078] When the third heating member 30 is provided, the first heating member 10, the second heating member 20 and the third heating member 30 can be relatively movable, so as to flexibly adjust the positions of the first heating member 10, the second heating member 20 and the third heating member 30, thereby meeting different heating requirements and temperature distribution requirements by adjusting the positions and angles of the heating members.

[0079] In a specific embodiment, one or two of the first heating member 10, the second heating member 20 and the third heating member 30 can be arranged in a fixed position all the time, and the other heating member can be arranged as a movable heating member, so as to realize the relative movement of the three. Alternatively, all of the first heating member 10, the second heating member 20 and the third heating member 30 can be arranged to be movable freely, so as to realize the relative movement of the three.

[0080] For example, the third heating member 30 can be arranged in a fixed position all the time, and the first heating member 10 and the second heating member 20 can be arranged to be movable relative to the third heating member 30, so as to reliably adhere the three heating members to different outer surfaces of the battery cell 40 respectively by moving the first heating member 10 and the second heating member 20. Alternatively, all of the first heating member 10, the second heating member 20 and the third heating member 30 can be arranged to be movable freely, so as to reliably adhere the three heating members to different outer surfaces of the battery cell 40 respectively by moving the heating members.

[0081] In summary, in the battery cell heating device described above, the first heating member and the second heating member can move relative to each other, so as to reliably adhere the first heating surface of the first heating member and the second heating surface of the second heating member to different outer surfaces of the battery cell respectively, thereby directly heating the battery cell and making the gas inside the battery cell be discharged after being heated. Meanwhile, the temperature inside the battery cell can be stabilized, and the temperature of the electrolyte injected into the battery cell can be stabilized during the injection of the electrolyte, so as to ensure the high flowability of the electrolyte and make the bubbles be more easily excluded, which is beneficial to improve the impregnation effect of the electrolyte and the injection speed. Meanwhile, the electrolyte injected into the battery cell is continuously heated, and the electrolyte is less likely to be volatilized during the heating process, so as to be safer. In addition, the battery cell heating device has a simple structure, a low cost and a simpler heating operation during the injection of the electrolyte.

[0082] Those skilled in the art can understand that, although some embodiments herein do not include certain features included in other embodiments, the combination of features of different embodiments is still within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0083] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell heating device, characterized in that, The battery cell heating device includes: a first heating element and a second heating element; The first heating element has a first heating surface, and the second heating element has a second heating surface; the first heating element and the second heating element are movable relative to each other, so that the first heating surface and the second heating surface can respectively abut against different outer surfaces of the battery cell to heat the battery cell.

2. The battery cell heating device according to claim 1, characterized in that, The first heating surface and the second heating surface are opposite each other, so that the first heating surface and the second heating surface can respectively abut against the two opposite outer surfaces of the battery cell.

3. The battery cell heating device according to claim 1 or 2, characterized in that, The contact area between the first heating surface and the battery cell accounts for 60%-100% of the outer surface area that the first heating surface is in contact with.

4. The battery cell heating device according to claim 3, characterized in that, The contact area between the second heating surface and the battery cell accounts for 60%-100% of the outer surface area that the second heating surface is in contact with.

5. The battery cell heating device according to claim 1 or 2, characterized in that, The first heating surface is subjected to a pressure of 0.02-0.1 MPa on the outer surface to which the first heating surface is attached.

6. The battery cell heating device according to claim 5, characterized in that, The second heating surface is subjected to a pressure of 0.02-0.1 MPa on the outer surface against which the second heating surface is attached.

7. The battery cell heating device according to claim 1, characterized in that, The battery cell heating device further includes a third heating element, which has a third heating surface. The first heating surface, the second heating surface, and the third heating surface can respectively abut against different outer surfaces of the battery cell.

8. The battery cell heating device according to claim 7, characterized in that, The first heating surface and the second heating surface are opposite each other, and the orientation of the third heating surface is perpendicular to both the orientation of the first heating surface and the orientation of the second heating surface, so that the first heating surface, the second heating surface and the third heating surface can respectively abut against the three sequentially adjacent outer surfaces of the battery cell.

9. The battery cell heating device according to claim 7, characterized in that, The first heating element, the second heating element, and the third heating element are all movable relative to each other.

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