Battery cell hot-pressing apparatus

Abstract

The application discloses a kind of electric core hot-pressing equipment, comprising: pressing device, including first pressing piece and second pressing piece, first pressing piece is used to carry electric core, second pressing piece is oppositely arranged with first pressing piece;Drive device is used to drive first pressing piece and second pressing piece to be opposite and close or far away;First magnetic conduction device includes at least one first magnetic conduction piece, and first magnetic conduction piece is connected to first pressing piece;Second magnetic conduction device includes at least one second magnetic conduction piece, and second magnetic conduction piece is connected to second pressing piece;At least one coil is connected in first magnetic conduction piece and second magnetic conduction piece;When first pressing piece and second pressing piece are opposite and close to pressing position, first magnetic conduction piece and second magnetic conduction piece are opposite and close, so that first magnetic conduction piece and second magnetic conduction piece form closed magnetic conduction path.The hot-pressing equipment of the application is provided with magnetic conduction piece, and the magnetic conduction piece can form closed magnetic conduction path, enhance the penetration ability of magnetic field, shorten heating time.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a cell hot pressing device. 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. Typically, hot-pressing equipment integrates heating elements such as heating tubes inside the pressing plate. These heating elements first heat the pressing plate, and then the pressing plate heats the battery cell. During this process, heat loss and attenuation occur, and the heating sequence of the battery cell is from the outside in, resulting in a relatively long heating time. Therefore, a method using electromagnetic induction to heat the battery cell exists. This method typically involves placing a coil on the pressing plate or the first pressing component carrying the battery cell, using the alternating magnetic field generated by the coil to heat the battery cell. However, given the thickness of the battery cell, current electromagnetic induction heating devices can only heat the surface layer of the cell, which is insufficient to meet the requirements. 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 battery cell hot pressing device that can heat the battery cell through electromagnetic induction.

[0004] The battery cell hot pressing device according to an embodiment of the present invention includes:

[0005] A pressing device includes a first pressing member and a second pressing member, wherein the first pressing member is used to carry the battery cell, and the second pressing member is disposed opposite to the first pressing member;

[0006] A driving device, connected to at least one of the first pressing member and the second pressing member, is used to drive the first pressing member and the second pressing member to move closer or further apart;

[0007] The first magnetic conductive device includes at least one first magnetic conductive element, which is connected to the first pressing element;

[0008] The second magnetic conductive device includes at least one second magnetic conductive element, which is connected to the second pressing element;

[0009] A coil, wherein at least one of the first magnetic conductive element and the second magnetic conductive element is connected to the coil;

[0010] When the first pressing member and the second pressing member are relatively close to each other at the pressing position, the first magnetic conductive member and the second magnetic conductive member are relatively close to each other, so that the first magnetic conductive member and the second magnetic conductive member form a closed magnetic conductive path.

[0011] The battery cell hot pressing device according to embodiments of the present invention has at least the following beneficial effects:

[0012] The hot pressing device of this invention is equipped with a magnetic conductive component, which can form a closed magnetic conductive path, enhancing the penetration ability of the magnetic field. This allows both the surface and interior of the battery cell to be directly heated, thereby shortening the heating time and making the heating of the battery cell more uniform. Furthermore, the magnetic conductive component and the pressing component can move synchronously. When the thickness of the battery cell changes, the magnetic conductive component and the pressing component can move to adapt to the change in battery cell thickness.

[0013] In other embodiments of the present invention, the first magnetic conductive member has a first magnetic conductive portion at its first end away from the first pressing member, and the second magnetic conductive member has a second magnetic conductive portion at its second end away from the second pressing member. When the first pressing member and the second pressing member are relatively close to each other at the pressing position, the first magnetic conductive portion and the second magnetic conductive portion are staggered and adjacent to each other in the horizontal direction, and the highest position of the first magnetic conductive portion is not lower than the lowest position of the second magnetic conductive portion.

[0014] In other embodiments of the present invention, the first end portion includes a plurality of first magnetic conductive portions spaced apart, and the second end portion includes a plurality of second magnetic conductive portions spaced apart. When the first pressing member and the second pressing member are relatively close to each other to the pressing position, a second magnetic conductive portion is inserted between adjacent first magnetic conductive portions, and a first magnetic conductive portion is inserted between adjacent second magnetic conductive portions.

[0015] In other embodiments of the present invention, the first magnetic conductive element and the second magnetic conductive element are configured such that when the first pressing element and the second pressing element are relatively close to each other to the pressing position, the first magnetic conductive element is located away from the first pressing element at a first end, and is staggered and adjacent to the second magnetic conductive element located away from the second pressing element at a second end in the horizontal direction, and the highest position of the first end is not lower than the lowest position of the second end.

[0016] In other embodiments of the present invention, both the first magnetic conductive element and the second magnetic conductive element are connected to the coil.

[0017] In other embodiments of the present invention, the first pressing member has a first pressing surface, the second pressing member has a second pressing surface, the first magnetic conductive member is connected to the third end of the first pressing member perpendicular to the first pressing surface, and the second magnetic conductive member is connected to the fourth end of the second pressing member perpendicular to the second pressing surface.

[0018] In other embodiments of the present invention, the first pressing member includes a base and a pressing part, the pressing part having a pressing surface that supports the battery cell, the first magnetic conductive member and the pressing part being connected to the base, and the first magnetic conductive member and the pressing part being separately disposed along the pressure transmission direction.

[0019] In other embodiments of the present invention, a slot is provided on the side of the pressing part facing away from the pressing surface, and the first magnetic conductive element is connected to the third end of the first pressing part and inserted into the slot.

[0020] In other embodiments of the present invention, the first pressing member further includes a support portion, the pressing portion being connected to the base portion through the support portion to form an installation space between the pressing portion and the base portion, and the first magnetic conductive member being connected to the third end of the first pressing member extending into the installation space and perpendicular to the pressing surface.

[0021] In other embodiments of the present invention, the first magnetic conductive device includes a plurality of first magnetic conductive elements, the second magnetic conductive device includes a plurality of second magnetic conductive elements, the second magnetic conductive elements are correspondingly arranged with respect to the first magnetic conductive elements, wherein the plurality of first magnetic conductive elements are arranged sequentially along the length direction of the battery cell, and / or the plurality of first magnetic conductive elements are arranged sequentially along the width direction of the battery cell.

[0022] 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

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a front view of a cell hot-pressing device according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A simplified schematic diagram of the hot pressing equipment for battery cells;

[0026] Figure 3 This is a simplified schematic diagram of the battery cell hot pressing device in a pressing state according to another embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection between the magnetic conductor and the coil in another embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the cooperation between the first magnetic component and the second magnetic component when the battery cell hot pressing device is in a pressing state, according to another embodiment of the present invention.

[0029] Figure 6 for Figure 1 A schematic diagram showing the engagement of the first and second magnetic conductive components when the hot pressing equipment for the core is in the pressing state;

[0030] Figure 7 This is a schematic diagram of the cooperation between the first magnetic component and the second magnetic component when the battery cell hot pressing device is in a pressing state, according to another embodiment of the present invention.

[0031] Figure 8 for Figure 1 A cross-sectional view of the connection between the first pressing component and the first magnetic conductive component.

[0032] Figure label:

[0033] Pressing device 100, first pressing component 110, first pressing surface 111, base 112, pressing part 113, support part 114, second pressing component 120, second pressing surface 121;

[0034] Drive unit 200;

[0035] First magnetic conductive device 300, first magnetic conductive element 310, first end 311, first magnetic conductive part 312, third end 313;

[0036] Second magnetic conductive device 400, second magnetic conductive element 410, second end 411, second magnetic conductive part 412, fourth end 413;

[0037] Coil 500;

[0038] 600 cells;

[0039] Rack size 700. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] A battery cell is typically formed by winding or stacking a separator, positive electrode, and negative electrode. During the manufacturing process, the separator and electrode need to be solidified by hot pressing. Currently, there are hot pressing devices that heat the battery cell using the principle of electromagnetic induction. However, the hot pressing devices in related technologies usually use disc coils. However, such coils are usually used for heating cookware, and their penetration ability is limited. The thickness of the battery cell is much greater than the wall thickness of the cookware. Therefore, current electromagnetic induction hot pressing devices can only heat the surface layer of the battery cell and cannot heat the inside of the battery cell. Therefore, it is necessary to combine conventional heating methods or extend the heating time so that the heat can be transferred from the surface layer of the battery cell to the inside of the battery cell. The hot pressing device of this invention is equipped with a magnetic conductive element. The magnetic conductive element can form a closed magnetic conductive path, which enhances the penetration ability of the magnetic field, so that both the surface layer and the inside of the battery cell can be directly heated, thereby shortening the heating time and making the heating of the battery cell more uniform. The following is a detailed description with reference to the accompanying drawings.

[0046] Reference Figure 1 , Figure 2 , Figure 2The dashed lines in the diagram represent the parts of the magnetic conductor that are blocked. The battery cell hot pressing equipment includes a pressing device 100, a driving device 200, a first magnetic conductor 300, a second magnetic conductor 400, and a coil 500. The driving device 200 can cooperate with the pressing device 100 to press the battery cell 600. The first magnetic conductor 300 and the second magnetic conductor 400 can establish a closed magnetic conductor path and cooperate with the coil 500 to heat the battery cell 600.

[0047] The pressing device 100 includes a first pressing member 110 and a second pressing member 120, which are arranged opposite to each other. For example, the first pressing member 110 is located below and the second pressing member 120 is located above. In this way, the battery cell 600 can be placed on the first pressing member 110 and pressed by the first pressing member 110 and the second pressing member 120. Both the first pressing member 110 and the second pressing member 120 may include a pressure plate to fit against the large surface of the square battery cell 600. In addition, in order to realize the directional movement of the pressing members, the battery cell hot pressing equipment also includes a frame 700, on which a guide rail is provided. At least one of the first pressing member 110 and the second pressing member 120 is connected to the guide rail by a slider.

[0048] A driving device 200 is connected to at least one of the first pressing member 110 and the second pressing member 120, and is used to drive the first pressing member 110 and the second pressing member 120 to move closer or further apart. When they are closer together, the battery cell 600 can be squeezed; when they are further apart, the battery cell 600 to be pressed can be placed between the first pressing member 110 and the second pressing member 120, or the pressed battery cell 600 can be removed. The driving device 200 may include a driving member with a telescopic shaft, such as a cylinder, or a driving member with a rotating shaft, such as a motor, and convert the rotation of the rotating shaft into linear movement of the pressing member through a transmission system. The driving device 200 may include a servo motor, a lead screw and a lead screw seat, thereby enabling precise control and adjustment of the pressing force between the first pressing member 110 and the second pressing member 120 to ensure the pressing effect and adapt to battery cells 600 of different thicknesses.

[0049] In the illustrated embodiment, the drive device 200 is connected to the frame 700, and its drive end (e.g., the drive shaft of a cylinder or the lead screw seat connected to the lead screw) is connected to the second pressing member 120. That is, the first pressing member 110 remains stationary to support the battery cell 600, while the second pressing member 120 moves relative to the first pressing member 110 under the drive of the drive device 200. This simplifies the structure of the drive device 200 and reduces the difficulty of control.

[0050] The first magnetic guiding device 300 and the second magnetic guiding device 400 are used to construct a closed magnetic guiding path to enhance the penetration ability of the magnetic field. The first magnetic guiding device 300 includes at least one first magnetic guiding element 310, and the second magnetic guiding device 400 includes at least one second magnetic guiding element 410. The first magnetic guiding element 310 is connected to the first pressing member 110, and the second magnetic guiding element 410 is connected to the second pressing member 120. The number and position of the first magnetic guiding element 310 and the second magnetic guiding element 410 are correspondingly arranged, so that the magnetic guiding elements can move synchronously with the pressing member. Figure 1 As shown in the example, when the second pressing member 120 moves downward to a pressing position that is relatively close to the first pressing member 110, the second magnetic conductive member 410 also moves downward synchronously to approach the first magnetic conductive member 310, and finally forms a closed magnetic conductive path with the first magnetic conductive member 310.

[0051] The magnetic conductive element can be composed of multiple layers of stacked magnetic conductive sheets, such as stacked silicon steel sheets. The magnetic conductive element can be a U-shaped structure as shown in the diagram, allowing the first magnetic conductive element 310 and the second magnetic conductive element 410 to form a roughly ring-shaped structure, thus establishing a closed magnetic conductive path. It should be noted that the so-called closed magnetic conductive path is not limited to being completely closed. Along the direction of the magnetic lines of force, when the pressing component is in the pressing position, the first magnetic conductive element 310 and the second magnetic conductive element 410 can be close together, can overlap, or can have a small gap (e.g., along the direction of the magnetic lines of force). Figure 3 (As shown).

[0052] At least one of the first magnetic conductive element 310 and the second magnetic conductive element 410 is connected to a coil 500. By passing an alternating current through the coil 500, an alternating magnetic field can be generated to heat the battery cell 600. The connection position of the coil 500 is not limited; for example, Figure 1 The coil 500 is vertically sleeved on the magnetic component. For example, Figure 4 The coil is horizontally connected to the magnetic conductor.

[0053] This embodiment integrates the pressing component and the magnetic conductive component together, enabling them to move synchronously, which has the following advantages:

[0054] 1. When the pressed parts are pressed, the magnetic conductive parts can also establish a magnetic conductive path at the same time, so that heating can be carried out while pressurizing, which helps to improve the hot pressing efficiency.

[0055] 2. If fixed magnetic conductors are used, the spacing between them will be fixed. When the spacing between the magnetic conductors is suitable for a thinner battery cell 600, it cannot be applied to a thicker battery cell 600. Conversely, when the spacing between the magnetic conductors is suitable for a thicker battery cell 600, the distance between the magnetic conductors and the thinner battery cell 600 will increase significantly, forming a wider air gap between the magnetic conductors and the battery cell 600. This greatly affects the magnetic field's transmission ability, making it difficult to heat the inside of the battery cell 600. In this embodiment, since the magnetic conductors and the pressing component are integrated and move synchronously, when the thickness of the battery cell 600 changes, the magnetic conductors and the pressing component can move to adapt to the thickness change of the battery cell 600, ensuring that the distance between the magnetic conductors and the battery cell 600 remains constant to meet the distance required for sufficient heating.

[0056] 3. When the pressed parts separate, the magnetic components will also separate from each other, which will not hinder the loading and unloading of the battery cell 600.

[0057] In some embodiments, refer to Figure 2 The first magnetic conductive element 310 includes a third end 313 connected to the first pressing element 110 and a first end 311 away from the first pressing element 110, the first end 311 being in a free state. Correspondingly, the second magnetic conductive element 410 includes a fourth end 413 connected to the second pressing element 120 and a second end 411 away from the second pressing element 120, the second end 411 being in a free state. (Refer to...) Figure 5 The first end 311 of the first magnetic conductive member 310 includes a first magnetic conductive portion 312, and the second end 411 of the second magnetic conductive member 410 includes a second magnetic conductive portion 412. When the first pressing member 110 and the second pressing member 120 are relatively close to each other to the pressing position (i.e., Figure 5 When positioned as shown, the first magnetically conductive part 312 and the second magnetically conductive part 412 are staggered and adjacent in the horizontal direction, such that the highest position of the first magnetically conductive part 312 is not lower than the lowest position of the second magnetically conductive part 412. Thus, in the overlapping area of ​​the first magnetically conductive part 312 and the second magnetically conductive part 412, the air gap 'a' between them is extremely small, thereby reducing the magnetic resistance in the magnetic conductive path and ensuring the magnetic induction intensity in the magnetic circuit. It should be noted that, without hindering the relative movement of the first magnetically conductive part 310 and the second magnetically conductive part 412, a smaller air gap 'a' is more beneficial for reducing magnetic resistance.

[0058] When pressing the battery cell 600, pressure is typically applied along the thickness direction. This is because the separator and electrode are stacked along the thickness direction, and the thickness direction dimension is the smallest compared to the width and length dimensions, facilitating magnetic field penetration of the battery cell 600. Based on this, in some specific embodiments, refer to... Figure 5The first end 311 of the first magnetic conductive element 310 and the second end 411 of the second magnetic conductive element 410 are arranged along the thickness direction of the cell 600. The first magnetic conductive part 312 and the second magnetic conductive part 412 both extend in the vertical direction. In this way, even if the thickness of the cell 600 changes and the first magnetic conductive element 310 and the second magnetic conductive element 410 move relative to each other in the vertical direction, the width of the air gap a between the first end 311 and the second end 411 can still be kept constant.

[0059] It should be noted that, due to the relatively thick thickness of the battery cell 600, to achieve overall heating of the battery cell 600, it is necessary to ensure the magnetic induction intensity in the magnetic circuit. The magnetic reluctance in the magnetic circuit is an important factor affecting the magnetic induction intensity. When there is a wide air gap in the magnetic circuit, the magnetic reluctance in the magnetic circuit will increase significantly. Therefore, how to ensure that the battery cell hot pressing equipment can adapt to battery cells 600 of different thicknesses while minimizing the width of the air gap in the magnetic circuit is a problem that needs to be overcome in the practical application of the battery cell hot pressing equipment. In this embodiment, by interlacing the magnetic conductive parts, the relative movement between the magnetic conductive parts is achieved, while avoiding the change of the air gap in the magnetic circuit with the thickness of the battery cell 600.

[0060] Reference Figure 6 In some specific embodiments, the first end 311 of the first magnetic conductive member 310 includes a plurality of spaced-apart first magnetic conductive portions 312, and the second end 411 of the second magnetic conductive member 410 includes a plurality of spaced-apart second magnetic conductive portions 412. When the first pressing member 110 and the second pressing member 120 are relatively close to each other to the pressing position (i.e., Figure 6 When positioned as shown, a second magnetically conductive part 412 is inserted between adjacent first magnetically conductive parts 312, and a first magnetically conductive part 312 is inserted between adjacent second magnetically conductive parts 412. Providing multiple first magnetically conductive parts 312 and second magnetically conductive parts 412 increases the relative area between each magnetically conductive part in the intersection region. The relative area is equal to the product of the intersection length and the width of the magnetically conductive part. For example, when the intersection length and the width of the magnetically conductive part are both the same... Figure 6 The relative area in is much larger than Figure 5 The relative area in the matrix is ​​related to the magnetic reluctance, which is inversely proportional to the relative area. Figure 6 Compared to the solution in the middle Figure 5 The proposed solution can further reduce magnetic resistance.

[0061] It should be noted that in other embodiments, the first end 311 of the first magnetic conductor 310 and the second end 411 of the second magnetic conductor 410 may be completely offset, such that the highest position of the first end 311 is not lower than the lowest position of the second end 411, for example... Figure 7As shown, the first magnetic conductive element 310 also includes a first end 311 and a third end 313, and the second magnetic conductive element 410 also includes a second end 411 and a fourth end 413. In this embodiment, the first end 311 and the second end 411 are offset along the horizontal direction, and the second end 411 is located on one side of the first end 311 in the horizontal direction and the two are arranged adjacent to each other. Similarly, when the thickness of the cell 600 changes, the first end 311 and the second end 411 move relative to each other to adapt to the thickness change of the cell 600, and can keep the width of the air gap a constant.

[0062] In some embodiments, refer to Figure 1 Both the first magnetic conductor 310 and the second magnetic conductor 410 are connected to coils 500, which can increase the magnetic induction intensity in the magnetic circuit and can heat the battery cell 600 from both sides of the thickness direction of the battery cell 600 respectively. This is equivalent to only needing to heat half the thickness of the battery cell 600 by a single coil 500, which is more conducive to the full heating of the battery cell 600.

[0063] It should be noted that this embodiment does not limit the number of coils 500 connected on the magnetic conductor. For example, one or more coils 500 can be connected on a magnetic conductor.

[0064] In some embodiments, refer to Figure 2 The first pressing member 110 has a first pressing surface 111, which can be a plane located at the top of the first pressing member 110. The second pressing member 120 has a second pressing surface 121, which can be a plane located at the bottom of the second pressing member 120. The areas of both the first pressing surface 111 and the second pressing surface 121 are larger than the area of ​​the large surface of the battery cell 600. The first magnetic conductive member 310 is connected to one end of the first pressing member 110 (e.g., the third end 313 mentioned above) and is perpendicular to the first pressing surface 111. The second magnetic conductive member 410 is connected to one end of the second pressing member 120 (e.g., the fourth end 413 mentioned above) and is perpendicular to the second pressing surface 121. In this way, magnetic lines of force can pass perpendicularly through the battery cell 600, increasing the magnetic field penetration capability.

[0065] In some embodiments, since the magnetic conductive element and the pressing element are integrated, and the pressing element needs to apply a large pressure to the cell 600 (while also needing to withstand a large reaction force), but the magnetic conductive element usually cannot withstand excessive pressure, in some embodiments of the present invention, the magnetic conductive element and the pressing element for pressing are separated, so that the reaction force borne by the pressing element is not transmitted to the magnetic conductive element. Specifically, the first pressing element 110 is used as an example for explanation, referring to... Figure 8The first pressing member 110 includes a base 112 and a pressing part 113. The pressing part 113 has a pressing surface that supports the battery cell 600, such as the first pressing surface 111 mentioned above. The first magnetic conductive member 310 and the pressing part 113 are both connected to the base 112, and the first magnetic conductive member 310 and the pressing part 113 are separately disposed. It should be noted that the separation of the first magnetic conductive member 310 and the pressing part 113 refers to their separation along the direction of force transmission, not that there can be no connection between the first magnetic conductive member 310 and the pressing part 113. Figure 8 As shown in the figure, along the direction of force transmission, that is, the vertical direction in the figure, there is a gap between the third end 313 of the first magnetic conductive element 310 and the pressing part 113. The reaction force borne by the pressing part 113 will be transmitted to the base 112, but will not be transmitted to the first magnetic conductive element 310, so as to avoid the first magnetic conductive element 310 being damaged due to excessive pressure.

[0066] In some specific embodiments, the pressing portion 113 has a certain thickness to ensure the strength of the pressing portion 113 itself. Based on this, referring to... Figure 8 A slot 1131 is provided on the side of the pressing part 113 facing away from the first pressing surface 111 (i.e., the lower side in the figure). The third end 313 of the first magnetic conductive member 310 is inserted into the slot 1131, thereby shortening the distance between the third end 313 and the first pressing surface 111. This allows it to be closer to the battery cell 600 during pressing, increasing the magnetic field penetration capability. It should be noted that, without affecting the strength of the pressing part 113, the closer the third end 313 is to the first pressing surface 111, the more beneficial it is to increasing the magnetic field penetration capability.

[0067] In some specific embodiments, reference is made to Figure 8 The first pressing member 110 also includes a support portion 114. The pressing portion 113 is connected to the base 112 through the support portion 114 to form an installation space between the pressing portion 113 and the base 112. The force borne by the pressing portion 113 can be transmitted to the base 112 through the support portion 114. The third end 313 of the first magnetic conductive member 310 extends into the installation space and is directly or through other installation structures mounted to the base 112. Since the pressing portion 113 and the base 112 have an installation space, the third end 313 can be set from the lower side of the pressing portion 113 in an attitude perpendicular to the first pressing surface 111. The first end 311 of the first magnetic conductive member 310 extends out of the installation space as a free end, which can cooperate with the second end 411 to form a closed magnetic conductive path. Based on the above structure, the pressing portion can move synchronously with the magnetic conductive member and can also achieve force separation, and the structure is compact.

[0068] In some specific embodiments, the first magnetic guiding device 300 includes a plurality of first magnetic guiding elements 310, as shown in the figure. Figure 1Multiple first magnetic conductive elements 310 are arranged along the width direction of the battery cell 600, as shown in the figure. The first magnetic conductive device 300 includes two first magnetic conductive elements 310, which are respectively arranged on both sides of the width direction of the battery cell 600. For example, refer to Figure 8 Multiple first magnetic conductive elements 310 are arranged along the length direction of the battery cell 600, as shown in the figure. The first magnetic conductive device 300 includes three first magnetic conductive elements 310, which are arranged along the length direction of the battery cell 600. Alternatively, multiple first magnetic conductive elements 310 may be arranged simultaneously along both the length and width directions of the battery cell 600. Specifically, the first magnetic conductive device 300 includes six first magnetic conductive elements 310, which are arranged in two rows along the width direction of the battery cell 600, with each row including three first magnetic conductive elements 310. The second magnetic conductive device 300 also includes multiple second magnetic conductive elements 410, the number and position of which correspond to the first magnetic conductive elements 310.

[0069] By setting multiple first magnetic conductive elements 310 and second magnetic conductive elements 410, the heating capacity can be enhanced, and the various areas of the battery cell 600 can be heated uniformly.

[0070] 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 battery cell hot pressing device, characterized in that, include: A pressing device includes a first pressing member and a second pressing member, wherein the first pressing member is used to carry the battery cell, and the second pressing member is disposed opposite to the first pressing member; A driving device, connected to at least one of the first pressing member and the second pressing member, is used to drive the first pressing member and the second pressing member to move closer or further apart; The first magnetic conductive device includes at least one first magnetic conductive element, which is connected to the first pressing element; The second magnetic conductive device includes at least one second magnetic conductive element, which is connected to the second pressing element; A coil, wherein at least one of the first magnetic conductive element and the second magnetic conductive element is connected to the coil, the coil being used to generate an alternating magnetic field to heat the battery cell; When the first pressing member and the second pressing member are relatively close to each other to the pressing position, the first magnetic conductive member and the second magnetic conductive member are relatively close to each other to form a roughly ring-shaped structure, so that the first magnetic conductive member and the second magnetic conductive member form a closed magnetic conductive path to increase the penetration ability of the magnetic field.

2. The cell hot pressing equipment according to claim 1, characterized in that, The first magnetic conductive member has a first magnetic conductive portion at its first end away from the first pressing member, and the second magnetic conductive member has a second magnetic conductive portion at its second end away from the second pressing member. When the first pressing member and the second pressing member are relatively close to each other at the pressing position, the first magnetic conductive portion and the second magnetic conductive portion are staggered and adjacent to each other in the horizontal direction, and the highest position of the first magnetic conductive portion is not lower than the lowest position of the second magnetic conductive portion.

3. The cell hot pressing equipment according to claim 2, characterized in that, The first end includes a plurality of first magnetic conductive parts spaced apart, and the second end includes a plurality of second magnetic conductive parts spaced apart. When the first pressing member and the second pressing member are relatively close to each other to the pressing position, a second magnetic conductive part is inserted between adjacent first magnetic conductive parts, and a first magnetic conductive part is inserted between adjacent second magnetic conductive parts.

4. The cell hot pressing equipment according to claim 1, characterized in that, The first magnetic conductive element and the second magnetic conductive element are configured such that when the first pressing element and the second pressing element are relatively close to each other to the pressing position, the first end of the first magnetic conductive element away from the first pressing element and the second end of the second magnetic conductive element away from the second pressing element are staggered and adjacent to each other in the horizontal direction, and the highest position of the first end is not lower than the lowest position of the second end.

5. The cell hot pressing equipment according to claim 1, characterized in that, Both the first magnetic conductive element and the second magnetic conductive element are connected to the coil.

6. The cell hot pressing equipment according to claim 1, characterized in that, The first pressing member has a first pressing surface, the second pressing member has a second pressing surface, the first magnetic conductive member is connected to the third end of the first pressing member and is perpendicular to the first pressing surface, and the second magnetic conductive member is connected to the fourth end of the second pressing member and is perpendicular to the second pressing surface.

7. The cell hot pressing equipment according to claim 1, characterized in that, The first pressing member includes a base and a pressing part. The pressing part has a pressing surface that supports the battery cell. The first magnetic conductive member and the pressing part are both connected to the base, and the first magnetic conductive member and the pressing part are separately disposed along the pressure transmission direction.

8. The cell hot pressing equipment according to claim 7, characterized in that, A slot is provided on the side of the pressing part facing away from the pressing surface, and the first magnetic conductive element is connected to the third end of the first pressing part and inserted into the slot.

9. The cell hot pressing equipment according to claim 7, characterized in that, The first pressing member further includes a support portion, which is connected to the base portion through the support portion to form an installation space between the pressing portion and the base portion. The first magnetic conductive member is connected to the third end of the first pressing member, extends into the installation space, and is perpendicular to the pressing surface.

10. The cell hot pressing equipment according to claim 1, characterized in that, The first magnetic conductive device includes a plurality of first magnetic conductive elements, and the second magnetic conductive device includes a plurality of second magnetic conductive elements. The second magnetic conductive elements are arranged correspondingly to the first magnetic conductive elements. The plurality of first magnetic conductive elements are arranged sequentially along the length direction of the battery cell, and / or the plurality of first magnetic conductive elements are arranged sequentially along the width direction of the battery cell.

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