Heating assembly, heating device and cell hot-pressing equipment

Abstract

The application discloses a heating assembly, a heating device and a battery cell hot-pressing equipment. The heating assembly comprises two coil assemblies, each coil assembly comprising a magnetic conducting member and a plurality of coils, the magnetic conducting member having three connection ends arranged in sequence, the connection ends being connected in a straight line, and each connection end being provided with a coil, and adjacent coils being adapted to pass through currents with a phase difference of 120 degrees. The two coil assemblies are arranged at intervals, a heating space is formed between the two coil assemblies, the connection ends of the magnetic conducting members of the two coil assemblies correspond to each other, the coils sleeved on the two corresponding connection ends are adapted to pass through currents with the same phase and can form a closed and linearly moving magnetic circuit. By corresponding the connection ends of the two magnetic conducting members and passing three-phase alternating currents through the coils on the three connection ends of the same magnetic conducting member, the closed magnetic circuit is linearly moved, so that the heating of the battery cell is uniform, the heating time of the battery cell is reduced, and the heating efficiency of the battery cell is improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a heating component, a heating device, and a cell hot pressing equipment. Background Technology

[0002] With technological advancements, power batteries are widely used in electric vehicles and other fields. The battery cell is the core component of a power battery, and its manufacturing process includes a hot-pressing step, where an external heat source heats the separator, causing the separator and electrode sheets to solidify under pressure. While some technologies utilize electromagnetic induction to heat the battery cell, the electromagnetic coils in these devices generate a stationary magnetic field. During heating, the area directly penetrated by the magnetic field lines experiences concentrated heat, while other areas receive relatively less heat. This uneven heating necessitates extending the heating time to ensure all areas reach the set temperature, impacting the cell's heating efficiency. Therefore, improvements are necessary to address this issue. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a heating assembly that can improve the heating efficiency of battery cells.

[0004] The present invention also proposes a heating device having the above-mentioned heating components.

[0005] The present invention also proposes a cell hot pressing device having the above-mentioned heating device.

[0006] A heating assembly according to an embodiment of the present invention includes:

[0007] Two coil assemblies, each coil assembly including a magnetic conductor and a plurality of coils, the magnetic conductor having three sequentially arranged connection ends, the connection lines of the three connection ends being on the same straight line, each connection end having a coil wound around it, and adjacent coils being adapted to carry currents with a phase difference of 120 degrees.

[0008] The two coil assemblies are spaced apart, forming a heating space between them. The connecting ends of the magnetic conductive parts of the two coil assemblies correspond to each other. The coils fitted on the two corresponding connecting ends are suitable for passing currents of the same phase and can form a closed and linearly moving magnetic circuit.

[0009] The heating assembly according to the embodiments of the present invention has at least the following beneficial effects: by the mutual correspondence of the connection ends of the two magnetic conductors, and by passing currents with a phase difference of 120 degrees through the coils on the three connection ends of the same magnetic conductor, the magnetic conductors can not only form a closed magnetic circuit, but also make the magnetic circuit move linearly. This results in the position where the magnetic field lines directly penetrate the battery cell within the area covered by the two magnetic conductors constantly changing, thereby making the heating of the battery cell uniform, reducing the heating time of the battery cell, and improving the heating efficiency of the battery cell.

[0010] According to some embodiments of the present invention, the coil assembly further includes a frame and a fixing member, the frame being connected to the magnetic conductive element and the fixing member, the fixing member being used to connect a fixing frame.

[0011] A heating device according to an embodiment of the present invention includes:

[0012] The heating assembly described in the above embodiments;

[0013] A stage for supporting battery cells;

[0014] A fixed frame is provided, the stage is fixedly connected to the fixed frame, and the heating assembly is connected to the fixed frame, wherein the stage is located between the two coil assemblies in a direction in which the two coil assemblies face each other.

[0015] The hot pressing equipment for battery cells according to embodiments of the present invention has at least the following beneficial effects: by applying the heating components of the present invention, the heating of the battery cells can be made more uniform, thereby shortening the heating time, improving the heating efficiency, and making the production cycle more compact.

[0016] According to some embodiments of the present invention, the heating device further includes a first driver and a plurality of the heating components, the first driver being connected to the heating components and the first driver being used to drive the heating components to move along a first direction, and each of the heating components being arranged on the fixed frame along the first direction.

[0017] According to some embodiments of the invention, at least one of the two coil assemblies of the heating assembly is movable along the fixture and relatively close to or away from the other coil assembly.

[0018] According to an embodiment of the present invention, a cell hot pressing apparatus includes:

[0019] The heating device described in the above embodiments;

[0020] A pressing device is used to press the battery cell heated by the heating device. The pressing device includes a first pressing member, a second pressing member, and a second driver. The first pressing member is used to carry the battery cell. The second pressing member is disposed opposite to the first pressing member. The second driver is connected to at least one of the first pressing member and the second pressing member and is used to drive the first pressing member and the second pressing member to move closer or further apart.

[0021] The hot pressing equipment for battery cells according to embodiments of the present invention has at least the following beneficial effects: by applying the heating device of the present invention, the heating of the battery cells can be made uniform, thereby shortening the heating time, improving the heating efficiency, making the production cycle more compact, and thus improving the production efficiency of the battery cells.

[0022] According to some embodiments of the present invention, in the heating device, one of the two coil assemblies is connected to the first pressing member, and the other is connected to the second pressing member.

[0023] According to some embodiments of the present invention, the first pressing member includes a first pressing base and a first pressing plate, the structural strength of the first pressing base is greater than the structural strength of the first pressing plate, the first pressing base is connected to the second driver, and the material of the first pressing plate is a non-metallic material;

[0024] And / or, the second pressing member includes a second pressing seat and a second pressing plate, the structural strength of the second pressing seat is greater than the structural strength of the second pressing plate, the second pressing seat is connected to the second driver, and the material of the second pressing plate is a non-metallic material.

[0025] According to some embodiments of the present invention, the first pressing member is provided with a first mounting groove, the second pressing member is provided with a second mounting groove, the first mounting groove and the second mounting groove are disposed opposite to each other, one of the coil assemblies of the heating device is disposed in the first mounting groove, and the other coil assembly is disposed in the second mounting groove.

[0026] According to some embodiments of the present invention, the battery cell hot pressing device further includes a first heat dissipation component, the first heat dissipation component includes a first connecting portion and a first heat-conducting portion, the first connecting portion is fixed to the first pressing component, the first pressing component is provided with a first hole, the first hole communicates with the first mounting groove, and the first heat-conducting portion is inserted into the first hole and is thermally connected to the magnetic component.

[0027] And / or, it also includes a second heat sink, the second heat sink including a second connecting part and a second heat conducting part, the second connecting part being fixed to the second pressing part, the second pressing part being provided with a second hole communicating with the second mounting groove, the second heat conducting part being inserted into the second hole and thermally connected to the magnetic conductive part.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0030] Figure 1 This is a schematic diagram of the heating assembly according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of a heating assembly according to another embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the first transient state of the magnetic field of the heating component according to an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the second transient state of the magnetic field of the heating component in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the third transient state of the magnetic field of the heating component in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the fourth transient state of the magnetic field of the heating component in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the heating device according to an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of a heating device according to another embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of a heating device according to another embodiment of the present invention;

[0039] Figure 10 This is a cross-sectional view of the battery cell hot pressing device according to an embodiment of the present invention;

[0040] Figure 11 This is a schematic diagram of a battery cell hot pressing device according to an embodiment of the present invention;

[0041] Figure 12 This is a schematic diagram of a cell hot pressing device according to another embodiment of the present invention;

[0042] Figure 13 This is a side view of the battery cell hot pressing device according to an embodiment of the present invention;

[0043] Figure 14 This is a schematic diagram of one arrangement of the electromagnetic coils of multiple heating components in an embodiment of the present invention;

[0044] Figure 15 This is a schematic diagram of another arrangement of the electromagnetic coils of multiple heating components in an embodiment of the present invention;

[0045] Figure 16 This is a schematic diagram of another arrangement of the electromagnetic coils of multiple heating components in an embodiment of the present invention;

[0046] Figure 17 This is a schematic diagram of another arrangement of the electromagnetic coils of multiple heating components in an embodiment of the present invention;

[0047] Figure 18 This is a schematic diagram of another arrangement of the electromagnetic coils of multiple heating components in an embodiment of the present invention;

[0048] Figure 19 This is a schematic diagram of another arrangement of the electromagnetic coils of multiple heating components in an embodiment of the present invention;

[0049] Figure 20 This is a schematic diagram of a cell hot pressing device according to another embodiment of the present invention.

[0050] Figure label:

[0051] Heating component 100, coil component 110, heating space 120, magnetic conductor 130, connecting end 135, coil 140, frame 150, fixing component 160, magnetic field area 170, first positive and negative pole wire 171, second positive and negative pole wire 172, first group of heating components 180, second group of heating components 190;

[0052] Heating device 200, fixing frame 210, frame body 220, third drive 230;

[0053] Stage 300, battery cell 310;

[0054] Battery cell hot pressing equipment 400;

[0055] The components include: a pressing device 500, a first pressing component 510, a first pressing seat 511, a first pressing plate 512, a first mounting groove 513, a first recess 514, a second recess 515, a third recess 516, a first heat dissipation hole 517, a first air inlet 518, a first air outlet 519, a second pressing component 520, a second pressing seat 521, a second pressing plate 522, a second mounting groove 523, a fourth recess 524, a fifth recess 525, a sixth recess 526, a second heat dissipation hole 527, a second air inlet 528, a second air outlet 529, a first hole 530, a second hole 540, a first heat dissipation component 550, a first connecting part 551, a first heat-conducting part 552, a first heat dissipation part 553, a first boss 554, a second heat dissipation component 560, a second connecting part 561, a second heat-conducting part 562, a second heat dissipation part 563, a second boss 564, and a second driver 570. Detailed Implementation

[0056] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0057] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0058] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0059] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0060] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] In related technologies, the magnetic field generated by the electromagnetic coil used to heat the battery cell is static. Due to the distribution of magnetic field lines within the magnetic field, some areas of the battery cell heat up faster than others, requiring extended heating time to ensure the slower-heating areas reach the set temperature. Therefore, uneven heating of the battery cell affects its heating efficiency. Embodiments of this invention provide a heating component that allows the magnetic field formed by the electromagnetic coil to continuously move within a certain area, thereby causing the area where magnetic field lines directly penetrate the battery cell to constantly change. This results in more uniform heating of the battery cell, ensuring higher heating efficiency.

[0062] The heating assembly 100, heating device 200, and battery cell hot pressing equipment 400 of the present invention are described below with reference to the accompanying drawings.

[0063] It should be noted that, Figures 11 to 13 In the diagram, the first heat dissipation hole 517, the second heat dissipation hole 527, the first hole 530, and the second hole 540 are represented by dashed lines.

[0064] Reference Figure 1 and Figure 2According to an embodiment of the present invention, the heating assembly 100 includes two coil assemblies 110. Each coil assembly 110 includes a magnetic conductor 130 and a plurality of coils 140. The magnetic conductor 130 has three sequentially arranged connection ends 135, the lines connecting the three connection ends 135 being on the same straight line. A coil 140 is wound around each connection end 135. Adjacent coils 140 are adapted to be supplied with currents that differ in phase by 120 degrees, i.e., three-phase alternating current is supplied to the coils 140 on the three connection ends 135. The two coil assemblies 110 are spaced apart, forming a heating space 120 between them. The heating space 120 is used to heat the battery cell 310. The connection ends 135 of the magnetic conductors 130 of the two coil assemblies 110 correspond to each other. The coils 140 wound on the two corresponding connection ends 135 are adapted to be supplied with currents of the same phase and can form a closed and linearly movable magnetic circuit. By aligning the connection ends 135 of the two magnetic conductors 130 with each other, and by passing three-phase alternating current through the coils 140 on the three connection ends 135 of the same magnetic conductor 130, the magnetic conductors 130 can form a closed magnetic circuit and also allow the magnetic circuit to move linearly. This results in the magnetic field lines directly penetrating the cell 310 within the area covered by the two magnetic conductors 130, causing the position to change continuously. Consequently, the cell 310 is heated evenly, reducing the heating time and improving the heating efficiency of the cell 310.

[0065] Changes in the magnetic circuit refer to Figures 3 to 6 . Figure 3 In the first transient state of the magnetic circuit, two closed magnetic circuits are distributed on both sides of the first positive and negative pole line 171. As time progresses, the magnetic circuit changes as follows: Figure 4 In the second transient, the first positive and negative pole lines 171 move to the right, the magnetic circuit to the right of the first positive and negative pole lines 171 shrinks, and the magnetic circuit to the left of the first positive and negative pole lines 171 expands and stretches, showing a tendency to split. Subsequently, the magnetic circuit changes as follows: Figure 5 In the third transient, a second positive and negative pole line 172, with opposite polarities to the first positive and negative pole line 171, is generated to the left of the first positive and negative pole line 171, resulting in three closed magnetic circuits. Subsequently, the magnetic circuit changes as follows: Figure 6 In the fourth transient state, the first positive and negative pole lines 171 and the magnetic circuit to their right disappear, while the second positive and negative pole lines 172 have two closed magnetic fields on their left and right sides. Subsequently, the magnetic field in the fourth transient state continues to cycle according to the process from the first to the fourth transient state, except that the positions of the second positive and negative pole lines 172 and the first positive and negative pole lines 171 are interchanged, until finally returning to the first transient state. The magnetic field continuously cycles according to the process from the first to the fourth transient state, and the magnetic circuit continuously moves within a certain magnetic field region 170, thereby achieving uniform heating of the battery cell 310.

[0066] It should be noted that the direction of movement of the magnetic circuit is determined by the input of three-phase alternating current. For example, in the above embodiment, the magnetic circuit moves and changes to the right. By changing the order of the three-phase alternating current interfaces of each coil 140, the magnetic circuit can move and change to the left.

[0067] Specifically, the magnetic conductor 130 can be formed by stacking multiple layers of magnetic sheets, such as silicon steel sheets, or the magnetic conductor 130 can be selected as an iron core. It should be noted that this embodiment does not limit the number of coils 140 connected to the magnetic conductor 130. For example, one connection end 135 on a magnetic conductor 130 can be connected to one or more coils 140.

[0068] In some embodiments of the present invention, reference is made to... Figure 2 The coil assembly 110 also includes a frame 150 and a fixing member 160. The frame 150 is connected to the magnetic conductor 130 and the fixing member 160. The fixing member 160 is used to connect the fixing frame 210. The connection between the coil assembly 110 and the fixing frame 210 is realized through the fixing member 160, so that the coil assembly 110 is installed in a set position for the processing of the battery cell 310, and the connection strength between the coil assembly 110 and the fixing frame 210 is sufficient. Compared with the magnetic conductor 130 being directly connected to the fixing frame 210, the impact on the structure of the magnetic conductor 130 can be reduced, thereby ensuring the stability of the magnetic circuit of the heating assembly 100.

[0069] This application also provides a heating device 200, see reference 200 Figure 2 and Figure 7 The system includes a stage 300, a mounting frame 210, and a heating assembly 100 as described in the above embodiment. The stage 300 is used to support the battery cell 310 and is fixedly connected to the mounting frame 210. The heating assembly 100 is connected to the mounting frame 210. The stage 300 is positioned between the two coil assemblies 110 in a direction where they face each other, allowing the battery cell 310 to be heated in the heating space 120. By applying the heating assembly 100 of this embodiment, the heating of the battery cell 310 can be made more uniform, thereby shortening the heating time, improving heating efficiency, and making the production cycle more compact.

[0070] Specifically, the stage 300 can be selected as a non-metallic tray to reduce the influence of the stage 300 material on the magnetic circuit. The stage 300 can be provided with through holes in the area corresponding to the cell 310, so that the magnetic field lines can pass directly through the part of the cell 310 that needs to be heated, further reducing the influence of the stage 300 on the heating effect of the heating component 100.

[0071] When the heating component 100 heats the battery cell 310, the heating effect is better where the magnetic field lines directly penetrate the battery cell 310, while the heating effect is relatively poor in other locations. When the size of the battery cell 310 is large, the heating space 120 of a single heating component 100 often only covers a portion of the battery cell 310, resulting in uneven heating of the battery cell 310. To solve the above problem, refer to... Figure 8 The heating device 200 also includes a first driver (not shown) and multiple heating components 100. Each heating component 100 is arranged on the fixing frame 210 along a first direction. The first driver is connected to the heating component 100 and is used to drive the heating component 100 to move along the first direction. By driving the heating component 100 to move along the first direction by the first driver, the heating component 100 can move continuously relative to the battery cell 310, thereby causing the heating space 120 of the heating component 100 to continuously change its coverage position on the battery cell 310, making the heating of the battery cell 310 more uniform.

[0072] In some embodiments, refer to Figure 8 When the first direction is set to a straight direction, the first driver can drive the heating component 100 to reciprocate in the first direction to ensure that the heating component 100 moves continuously relative to the battery cell 310. Multiple battery cells 310 to be heated can be arranged along the first direction to increase the number of battery cells 310 that can be heated per unit time.

[0073] Correspondingly, the mounting bracket 210 extends along the first direction. For example, the mounting bracket 210 may have a frame 220 extending along the first direction corresponding to the upper and lower parts of the stage 300, respectively. The upper and lower frame 220 are respectively connected to a coil assembly 110 of the heating component 100. The first driver can be selected as an electric pulley. The coil assembly 110 is slidably connected to the mounting bracket 210 through the electric pulley, thereby realizing the movement of the heating component 100 relative to the battery cell 310.

[0074] Furthermore, refer to Figure 9 Each heating component 100 is arranged in a closed ring along the first direction, so that the first driver can drive the heating component 100 to move in the positive or negative direction of the first direction, without driving the heating component 100 to reciprocate, thereby making the movement of the heating component 100 smoother and without stopping for reversing.

[0075] In the heating device 200 of this embodiment, the coil assemblies 110 of the plurality of heating components 100 have various layout configurations. For example, the arrangement direction of the two coils 140 of each coil assembly 110 is perpendicular to the first direction; or, the arrangement direction of the two coils 140 of each coil assembly 110 is parallel to or tangential to the first direction; or, the arrangement direction of the two coils 140 of some coil assemblies 110 is perpendicular to the first direction, while the arrangement direction of the two coils 140 of another portion of coil assemblies 110 is parallel to or tangential to the first direction. Specifically, Figures 14 to 19 Several examples are provided:

[0076] refer to Figure 14 and Figure 15 In some embodiments of the present invention, in the plurality of heating components 100, the arrangement direction of the two coils 140 of each coil component 110 is perpendicular to the first direction. Therefore, according to the actual heating requirements, the density of the heating components 100 can be adjusted by adjusting the spacing between adjacent heating components 100 along the first direction; the higher the density, the higher the heating efficiency. Adjacent heating components 100 can be aligned with each other along the first direction (e.g., ...). Figure 14 ) or staggered (e.g. Figure 15 The aligned heating components 100 can reduce the space occupied in the direction perpendicular to the first direction, and the staggered arrangement of adjacent heating components 100 can heat different positions of the passing battery cell 310. Therefore, during the transportation of the battery cell 310, the heating position of the battery cell 310 changes continuously, which can make the heating of the battery cell 310 more uniform.

[0077] refer to Figures 16 to 18 In other embodiments of the present invention, among the plurality of heating components 100, the arrangement direction of the two coils 140 of each coil component 110 is parallel to the first direction (when the arrangement trajectory of the heating components 100 is a straight line) or tangent to it (when the arrangement trajectory of the heating components 100 is an arc), and there is one heating component 100 perpendicular to the first direction, forming a row of coil components 110 arranged along the first direction (e.g., Figure 16 Alternatively, several heating elements 100 may be arranged perpendicular to the first direction, for example, two or three heating elements 100 may be arranged to form two columns (e.g., Figure 17 ) or 3 columns (e.g.) Figure 18 The coil assembly 110 can heat multiple locations of the battery cell 310, and the heated position of the battery cell 310 can be adjusted by adjusting the spacing between two adjacent rows of coil assemblies 110 along a direction perpendicular to the first direction. Depending on the conveying requirements, the number of rows of heating assemblies 100 arranged perpendicular to the first direction can be increased, thus making it suitable for battery cells 310 with a large size perpendicular to the first direction, or for cases where multiple rows of battery cells 310 are arranged perpendicular to the first direction, thereby expanding the conveying and heating capacity.

[0078] refer to Figure 19 In other embodiments of the present invention, the plurality of heating components 100 includes a first group of heating components 180 and a second group of heating components 190, wherein: the arrangement direction of the two coils 140 of the coil assembly 110 of the first group of heating components 180 is parallel to the first direction (when the arrangement trajectory of the heating components 100 is a straight line) or tangent to the first direction (when the arrangement trajectory of the heating components 100 is an arc); in the second group of heating components 190, the arrangement direction of the two coils 140 of the coil assembly 110 is perpendicular to the first direction. Therefore, the coil assembly 110 in the first group of heating components 180 and the second group of heating components 190 can heat different positions of the battery cell 310 respectively. In this embodiment, the first group of heating components 180 and the second group of heating components 190 are alternately arranged along the first direction, so that when the battery cell 310 is transported, it alternately passes through the first group of heating components 180 and the second group of heating components 190 along the first direction, and the heated position changes continuously, which can make the battery cell 310 heated more evenly.

[0079] Furthermore, in some embodiments of the heating device 200 of the present invention, at least one of the two coil assemblies 110 of the heating assembly 100 is movable along the fixing frame 210 and relatively closer to or farther away from the other coil assembly 110 to adjust the distance between the two coil assemblies 110, thereby expanding or shrinking the heating space 120. If the spacing between the two coil assemblies 110 is fixed, when the spacing between them is adapted to a thinner battery cell 310, it cannot be applied to a thicker battery cell 310. Conversely, when the spacing between them is adapted to a thicker battery cell 310, the distance between the coil assembly 110 and the thinner battery cell 310 will increase significantly, forming a wider air gap between the coil assembly 110 and the battery cell 310. This greatly affects the magnetic field's transmission capability, making it difficult to heat the inside of the battery cell 310. In this embodiment, by adjusting the distance between the two coil assemblies 110, when the thickness of the battery cell 310 changes, the distance between the two coil assemblies 110 can be adjusted to adapt to the change in the thickness of the battery cell 310, ensuring that the distance between the coil assembly 110 and the battery cell 310 remains constant to meet the distance required for sufficient heating. That is, this embodiment can adapt to battery cells 310 of different thicknesses, increasing the applicable scenarios of the heating device 200.

[0080] Specifically, in an embodiment where one of the two coil assemblies 110 can move along the fixed frame 210, one of the two coil assemblies 110 is fixed, and the other coil assembly 110 is connected to the fixed frame 210 of the device via a screw. Rotating the screw can move one of the coil assemblies 110. In an embodiment where both coil assemblies 110 can move along the fixed frame 210, both coil assemblies 110 can be connected to the fixed frame 210 of the device via screws, thereby enabling the two coil assemblies 110 to move relative to each other or move away from each other.

[0081] Furthermore, refer to Figure 7 The heating device 200 also includes a third driver 230, which drives the coil assemblies 110 to move, causing the two coil assemblies 110 to move closer or further apart. One of the two coil assemblies 110 is connected to the third driver 230; alternatively, the heating device 200 includes two third drivers 230, with each coil assembly 110 connected to one of the two third drivers 230. The movement of the coil assemblies 110 is achieved through the third driver 230, and the distance between the two coil assemblies 110 can be controlled by adjusting parameters, reducing the difficulty of adjusting the position of the coil assemblies 110 and improving the automation level of the heating device 200. Specifically, the third driver 230 can be selected as a conventional power component in the art, such as a cylinder or a motor.

[0082] Reference Figure 20 This invention also provides a battery cell hot pressing device 400, including the heating device 200 described above, and a pressing device 500. The pressing device 500 is used to press the battery cell 310 heated by the heating device 200. The pressing device 500 includes a first pressing member 510, a second pressing member 520, and a second driver 570. The first pressing member 510 carries the battery cell 310. The second pressing member 520 is disposed opposite to the first pressing member 510. The second driver 570 is connected to at least one of the first pressing member 510 and the second pressing member 520 to drive the first pressing member 510 and the second pressing member 520 to move closer or further apart. By applying the heating device 200 of this invention, the heating of the battery cell 310 can be made more uniform, thereby shortening the heating time, improving heating efficiency, making the production cycle more compact, and thus improving the production efficiency of the battery cell 310.

[0083] Specifically, in some embodiments, the heating device 200 and the pressing device 500 are separate units. The battery cell 310 is first heated by the heating device 200 and then transferred to the pressing device 500 for hot pressing.

[0084] In other embodiments, reference is made to Figure 20The heating device 200 and the pressing device 500 are designed as a single unit. One coil assembly 110 of the heating device 200 is connected to the first pressing member 510, and the other coil assembly 110 is connected to the second pressing member 520. In this embodiment, the second driver 570 can synchronously drive the first pressing member 510 and one of the coil assemblies 110 to move together, and / or, the second driver 570 can synchronously drive the second pressing member 520 and the other coil assembly 110 to move together, so that the two coil assemblies 110 can be brought closer together without the third driver 230. Specifically, in the coil assembly 110 connected to the first pressing member 510, the magnetic conductor 130 is connected to the end face of the first pressing member 510 opposite to the second pressing member 520. This allows the coil assembly 110 to move with the first pressing member 510 when it moves, thereby adjusting the distance between the magnetic conductors 130 of the first pressing member 510 and the second pressing member 520. This ensures that when the battery cell 310 is pressed, there is sufficient spacing between the two magnetic conductors 130 to generate a sufficiently strong magnetic field for electromagnetic induction heating. Similarly, in the coil assembly 110 connected to the second pressing member 520, the magnetic conductor 130 is connected to the end face of the second pressing member 520 opposite to the first pressing member 510, so that the coil assembly 110 can move with the first pressing member 510 when the second pressing member 520 moves.

[0085] In some embodiments, in order to apply sufficient pressing force to the battery cell 310, the thickness of the first pressing member 510 and the second pressing member 520 is set to be relatively large to ensure the structural strength of the first pressing member 510 and the second pressing member 520. However, the coil assembly 110 needs to penetrate the thicker first pressing member 510 and the second pressing member 520 before it can penetrate to the battery cell 310, affecting the heating effect on the battery cell 310. Therefore, embodiments of the present invention also provide an improvement, referring to... Figure 10The first pressing component 510 is provided with a first mounting groove 513, and the second pressing component 520 is provided with a second mounting groove 523. The first mounting groove 513 and the second mounting groove 523 are arranged opposite to each other. One coil assembly 110 of the heating device 200 is disposed in the first mounting groove 513, and the other coil assembly 110 is disposed in the second mounting groove 523. By setting the first mounting groove 513 and the second mounting groove 523, the coil assembly 110 connected to the first pressing member 510 is disposed inside the first pressing member 510, and the coil assembly 110 connected to the second pressing member 520 is disposed inside the second pressing member 520. While ensuring the structural strength of the first pressing member 510 and the second pressing member 520, the thickness of the first pressing member 510 and the second pressing member 520 that the magnetic field formed by the two coil assemblies 110 needs to penetrate is reduced, so that the magnetic field can smoothly penetrate into the interior of the battery cell 310, thereby ensuring the heating effect of the heating device 200 on the interior of the battery cell 310 and improving the heating efficiency of the battery cell 310.

[0086] It should be noted that the thickness of the first pressing part 510 and the second pressing part 520 refers to the dimensions of the first pressing part 510 and the second pressing part 520 along mutually opposite directions. See the attached reference for details. Figure 10 Logo.

[0087] As a further improvement to the above scheme, referring to Figure 10 The first pressing component 510 includes a first pressing seat 511 and a first pressing plate 512. The first pressing plate 512 is connected to the side of the first pressing seat 511 facing the second pressing component 520. The structural strength of the first pressing seat 511 is greater than that of the first pressing plate 512. The first mounting groove 513 includes a first groove 514, a second groove 515, and a third groove 516. The first groove 514, the second groove 515, and the third groove 516 are all disposed on the first pressing plate 512. The three connecting ends 135 of the magnetic conductive component 130 of the coil assembly 110 connected to the first pressing component 510 are respectively inserted into the first groove 514, the second groove 515, and the third groove 516. By setting a first groove 514, a second groove 515, and a third groove 516, and inserting the three connecting ends 135 of the magnetic conductor 130 of the coil assembly 110 connected to the first pressing member 510 into the first groove 514, the second groove 515, and the third groove 516 respectively, the three connecting ends 135 of the magnetic conductor 130 set at the first pressing member 510 are as close as possible to the magnetic conductor 130 at the second pressing member 520, so that the magnetic field formed by the two coil assemblies 110 can penetrate a part of the first pressing plate 512 to penetrate the battery cell 310, thus ensuring the heating effect of the battery cell 310.

[0088] The first pressure seat 511 is used for direct connection with the second driver 570, therefore it needs sufficient structural strength to withstand the driving force of the second driver 570. The first pressure plate 512 is in direct contact with the battery cell 310, and the first pressure plate 512 only needs to transmit force, so the structural strength requirement is lower. The different structural strength requirements of the first pressure seat 511 and the first pressure plate 512 allow for differentiated material selection. For example, the material of the first pressure seat 511 can be selected as an alloy with higher structural strength, while the material of the first pressure plate 512 can be selected as ordinary steel, thereby reducing the overall cost of the first pressing component 510.

[0089] In another embodiment, the second pressing member 520 includes a second pressing seat 521 and a second pressing plate 522. The second pressing plate 522 is connected to the side of the second pressing seat 521 facing the first pressing member 510. The structural strength of the second pressing seat 521 is greater than that of the second pressing plate 522. The second mounting groove 523 includes a fourth groove 524, a fifth groove 525 and a sixth groove 526. The fourth groove 524, the fifth groove 525 and the sixth groove 526 are all disposed on the second pressing plate 522. The three connecting ends 135 of the magnetic conductive member 130 of the coil assembly 110 connected to the second pressing member 520 are respectively inserted into the fourth groove 524, the fifth groove 525 and the sixth groove 526. Similar to the arrangement of the first groove 514, the second groove 515, and the third groove 516, the arrangement of the fourth groove 524, the fifth groove 525, and the sixth groove 526 allows the magnetic field generated by the two coil assemblies 110 to penetrate a portion of the second pressure plate 522 and thus penetrate the battery cell 310, ensuring the heating effect of the battery cell 310. The structural strength requirements and material selection for the second pressure base 521 and the second pressure plate 522 are the same as those for the first pressure base 511 and the first pressure plate 512, and will not be repeated here.

[0090] It is understood that in some embodiments, a first groove 514, a second groove 515, a third groove 516, a fourth groove 524, a fifth groove 525 and a sixth groove 526 are provided simultaneously so that the heating device 200 can achieve a better heating effect.

[0091] As a further improvement to the above solution, the material of the first pressure plate 512 is a non-metallic material. When the magnetic field formed by the two coil assemblies 110 penetrates the first pressure plate 512, the material of the first pressure plate 512 will affect the penetration effect of the magnetic field. Metallic materials have a greater impact on the magnetic field, while non-metallic materials have a smaller impact. Therefore, by selecting a non-metallic material for the first pressure plate 512, the magnetic field can penetrate the first pressure plate 512 more easily, thereby ensuring the heating effect on the inside of the battery cell 310.

[0092] In another embodiment, the second pressure plate 522 is made of a non-metallic material. The effect of choosing a non-metallic material for the second pressure plate 522 is the same as choosing a non-metallic material for the first pressure plate 512, and will not be repeated here. It is understood that in some embodiments, both the first pressure plate 512 and the second pressure plate 522 are made of non-metallic materials to enable the heating device 200 to achieve a better heating effect.

[0093] Based on the first mounting slot 513, since the coil 140 of the heating device 200 also dissipates heat when heating the battery cell 310, the coil 140 and the magnetic conductor 130 also dissipate heat. Since the coil assembly 110 is installed in the first mounting slot 513, the heat will be conducted to the first pressing component 510. After prolonged processing, the temperature of the first pressing component 510 will gradually rise, affecting production continuity. Therefore, this application also provides an improvement, referring to... Figure 13 The battery cell hot pressing device 400 also includes a first heat sink 550, which includes a first connecting portion 551 and a first heat-conducting portion 552. The first connecting portion 551 is fixed to the first pressing member 510. The first pressing member 510 is provided with a first hole 530, which communicates with the first mounting groove 513. The first heat-conducting portion 552 is inserted into the first hole 530 and is thermally connected to the magnetic component 130. By providing the first heat sink 550, contact heat conduction can be achieved on the magnetic component 130. The first heat sink 550 absorbs the heat generated by the magnetic component 130 and dissipates the heat to the outside, thereby dissipating heat from the magnetic component 130 inside the first pressing member 510.

[0094] In some embodiments, the cell hot pressing device 400 further includes a second heat sink 560, which includes a second connecting portion 561 and a second heat-conducting portion 562. The second connecting portion 561 is fixed to the second pressing member 520, and the second pressing member 520 is provided with a second hole 540 communicating with the second mounting groove 523. The second heat-conducting portion 562 is inserted into the second hole 540 and is thermally connected to the magnetic conductive member 130. The heat dissipation principle of the second heat sink 560 is the same as that of the first heat sink 550, and will not be described again here.

[0095] In some embodiments, the first heat sink 550 and the second heat sink 560 are provided simultaneously to improve the heat dissipation effect on the first pressing member 510 and the second pressing member 520. The first heat sink 550 and the second heat sink 560 can be selected as conventional heat sinks in the art, such as copper heat sinks, copper-aluminum composite heat sinks, or graphite heat sinks.

[0096] Furthermore, refer to Figure 13The first heat dissipation part 553 includes a plurality of first protrusions 554. One end of each first protrusion 554 is connected to the end of the first connecting part 551 away from the first pressing member 510, and the other end of each first protrusion 554 extends in the direction away from the first pressing member 510. The first protrusions 554 are spaced apart. By providing a plurality of first protrusions 554, the first heat dissipation part 553 is shaped like heat dissipation fins, increasing the contact area between the first heat dissipation part 553 and the air, thereby improving the heat dissipation efficiency of the first heat dissipation member 550.

[0097] In some embodiments, the second heat dissipation portion 563 includes a plurality of second protrusions 564. One end of each second protrusion 564 is connected to one end of the second connecting portion 561 away from the second pressing member 520, and the other end of each second protrusion 564 extends in a direction away from the second pressing member 520. The second protrusions 564 are spaced apart. By providing a plurality of second protrusions 564, the second heat dissipation portion 563 is shaped like heat dissipation fins, increasing the contact area between the second heat dissipation portion 563 and the air, thereby improving the heat dissipation efficiency of the second heat dissipation member 560.

[0098] In some embodiments, the first protrusion 554 of the first heat dissipation part 553 and the second protrusion 564 of the second heat dissipation part 563 are provided simultaneously to improve the heat dissipation efficiency of the first heat dissipation member 550 and the second heat dissipation member 560 in a synchronous manner.

[0099] In addition to the method of providing heat dissipation holes, embodiments of the present invention also provide an embodiment with other heat dissipation methods. (See reference...) Figure 11 The first pressing member 510 is provided with a first heat dissipation hole 517, which penetrates the first pressing member 510 in a direction perpendicular to the first pressing member 510 and toward the second pressing member 520. By providing the first heat dissipation hole 517, the contact area between the first pressing member 510 and the air is increased, and a channel for the medium to flow is formed within the first pressing member 510. When air flows through the first heat dissipation hole 517, it carries away the heat within the first pressing member 510, thus dissipating heat. In a further embodiment, an air-cooling device or a water-cooling device can also be provided at the first heat dissipation hole 517 to further improve heat dissipation efficiency.

[0100] In some embodiments, the second pressing member 520 is provided with a second heat dissipation hole 527, which penetrates the second pressing member 520 in a direction perpendicular to the first pressing member 510 toward the second pressing member 520. The heat dissipation principle of the second heat dissipation hole 527 is the same as that of the first heat dissipation hole 517, and will not be described again here.

[0101] In some embodiments, the pressing device 500 is provided with both a first heat dissipation hole 517 and a second heat dissipation hole 527 to synchronize the heat dissipation efficiency of the first pressing member 510 and the second pressing member 520. The number of the first heat dissipation hole 517 and the second heat dissipation hole 527 is not limited and can be adapted to the heat dissipation requirements.

[0102] As an improvement to the above scheme, referring to Figure 12 The first heat dissipation hole 517 includes a first air inlet 518 and a first air outlet 519. The first air inlet 518 and the first air outlet 519 are respectively disposed on the side of the first pressing member 510 perpendicular to the direction of the first pressing member 510 toward the second pressing member 520. The first air inlet 518 and the first air outlet 519 are respectively connected to the first mounting groove 513. In the cell hot pressing equipment 400, the area with the highest temperature is the area where the magnetic conductive element 130 and the coil 140 in the heating device 200 are located. The magnetic conductive element 130 and the coil 140 are both disposed in the first mounting groove 513. Therefore, by connecting the first mounting groove 513 to the outside through the first heat dissipation hole 517, the heat dissipation efficiency of the first heat dissipation hole 517 for the cell hot pressing equipment 400 can be further improved.

[0103] In some embodiments, the second heat dissipation hole 527 includes a second air inlet 528 and a second air outlet 529. The second air inlet 528 and the second air outlet 529 are respectively disposed on the side of the second pressing member 520 perpendicular to the direction of the first pressing member 510 toward the second pressing member 520. The second air inlet 528 and the second air outlet 529 are respectively connected to the second mounting groove 523. By connecting the second mounting groove 523 to the outside through the second heat dissipation hole 527, the heat dissipation efficiency of the second heat dissipation hole 527 for the battery cell hot pressing device 400 can be further improved.

[0104] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A heating assembly, characterized in that, include: Two coil assemblies, each coil assembly including a magnetic conductor and a plurality of coils, the magnetic conductor having three sequentially arranged connection ends, the connection lines of the three connection ends being on the same straight line, each connection end having a coil wound around it, and adjacent coils being adapted to carry currents with a phase difference of 120 degrees. The two coil assemblies are spaced apart, forming a heating space between them. The connecting ends of the magnetic conductive parts of the two coil assemblies correspond to each other. The coils fitted on the two corresponding connecting ends are suitable for passing currents of the same phase and can form a closed and linearly moving magnetic circuit. The magnetic circuit moves in a left-right direction. Two magnetic circuits exist between the two magnetically conductive components. Each magnetic circuit has a first transient state, a second transient state, a third transient state, and a fourth transient state. In the first transient state, the two magnetic circuits are spaced apart, with a first positive and negative pole line between them. In the second transient state, the first positive and negative pole line moves along the direction of magnetic circuit movement, and one of the magnetic circuits expands and stretches along this direction, exhibiting a tendency to split. In the third transient state, one of the magnetic circuits splits to form two magnetic circuits, resulting in a total of three magnetic circuits. Adjacent magnetic circuits are separated by a first positive and negative pole line and a second positive and negative pole line, respectively. The second positive and negative pole line has opposite polarities to the first positive and negative pole line. In the fourth transient state, the first positive and negative pole line and the magnetic circuit on one side along the direction of magnetic circuit movement disappear, and two magnetic circuits are formed on both sides of the second positive and negative pole line. The two magnetic circuits cycle through the process from the first transient state to the fourth transient state to achieve linear movement of the magnetic circuit within the magnetic field region.

2. The heating assembly according to claim 1, characterized in that, The coil assembly also includes a frame and a fixing member, the frame being connected to the magnetic conductive element and the fixing member, and the fixing member being used to connect to the fixing frame.

3. A heating device, characterized in that, include: The heating assembly as described in claim 1 or 2; A stage for supporting battery cells; A fixed frame is provided, the stage is fixedly connected to the fixed frame, and the heating assembly is connected to the fixed frame, wherein the stage is located between the two coil assemblies in a direction in which the two coil assemblies face each other.

4. The heating device according to claim 3, characterized in that, It also includes a first driver and a plurality of the heating components, the first driver being connected to the heating components and the first driver being used to drive the heating components to move along a first direction, and each of the heating components being arranged on the fixed frame along the first direction.

5. The heating device according to claim 3, characterized in that, At least one of the two coil assemblies of the heating assembly is capable of moving along the fixture and relatively close to or away from the other coil assembly.

6. A battery cell hot pressing device, characterized in that: Includes the heating device as described in any one of claims 3 to 5; A pressing device is used to press the battery cell heated by the heating device. The pressing device includes a first pressing member, a second pressing member, and a second driver. The first pressing member is used to carry the battery cell. The second pressing member is disposed opposite to the first pressing member. The second driver is connected to at least one of the first pressing member and the second pressing member and is used to drive the first pressing member and the second pressing member to move closer or further apart.

7. The cell hot pressing equipment according to claim 6, characterized in that, In the heating device, one of the two coil assemblies is connected to the first pressing member, and the other is connected to the second pressing member.

8. The cell hot pressing equipment according to claim 7, characterized in that, The first pressing component includes a first pressing base and a first pressing plate. The structural strength of the first pressing base is greater than that of the first pressing plate. The first pressing base is connected to the second driver. The material of the first pressing plate is a non-metallic material. And / or, the second pressing member includes a second pressing seat and a second pressing plate, the structural strength of the second pressing seat is greater than the structural strength of the second pressing plate, the second pressing seat is connected to the second driver, and the material of the second pressing plate is a non-metallic material.

9. The cell hot pressing equipment according to claim 7, characterized in that, The first pressing component is provided with a first mounting groove, and the second pressing component is provided with a second mounting groove. The first mounting groove and the second mounting groove are arranged opposite to each other. One of the coil assemblies of the heating device is disposed in the first mounting groove, and the other coil assembly is disposed in the second mounting groove.

10. The cell hot pressing equipment according to claim 9, characterized in that, It also includes a first heat sink, which includes a first connecting part and a first heat conducting part. The first connecting part is fixed to the first pressing part. The first pressing part is provided with a first hole, which communicates with the first mounting groove. The first heat conducting part is inserted into the first hole and is thermally connected to the magnetic component. And / or, it also includes a second heat sink, the second heat sink including a second connecting part and a second heat conducting part, the second connecting part being fixed to the second pressing part, the second pressing part being provided with a second hole communicating with the second mounting groove, the second heat conducting part being inserted into the second hole and thermally connected to the magnetic conductive part.

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