Battery baking jig and device, battery production apparatus, and heating plate manufacturing method

Abstract

Provided in the prevent application are a battery baking jig and device, a battery production apparatus, and a heating plate manufacturing method. The battery baking jig (200) comprises: a tray (210) provided with a heating plate (20), wherein the tray is configured to support and heat battery cells (100). The side of the tray for supporting the battery cells is divided into a plurality of sub-regions (2101), each sub-region is used for supporting the battery cell, and the area ratio of each sub-region to the tray is equal. By dividing the side of the tray for supporting the battery cells into a plurality of sub-regions, and by making the area ratio of each sub-region to the tray equal, during heating, the heating power of each sub-region is similar, so that the heating consistency of the battery cell in each sub-region can be higher, so as to improve the efficiency of baking and heating the battery cells.

Description

Battery baking jig, device, battery production equipment and heating plate manufacturing method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 31, 2023, with application number 202310952588.X and invention name “Battery baking jig, device, battery production equipment and heating plate manufacturing method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of battery production equipment, and more specifically, relates to a battery baking jig, device, battery production equipment, and a method for manufacturing a heating plate. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] During the battery cell production process, before adding electrolyte to the cells, they need to be baked to remove moisture from the electrode assembly. Currently, the cells are typically supported on a tray and then placed in a baking oven for heating and baking to remove moisture. However, due to the density of the cells installed, the heating power applied by the tray to different cells varies, resulting in poor heating consistency and slow heating efficiency.

[0005] Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a battery baking jig, device, battery production equipment and heating plate manufacturing method to solve the problem in the related art of poor temperature rise consistency in the baking and heating of battery cells, resulting in slow heating efficiency.

[0007] In a first aspect, an embodiment of the present application provides a battery baking jig, comprising a tray having a heating plate, the tray being used to support and heat battery cells;

[0008] The side of the tray used to support the battery cells is divided into multiple sub-areas, each sub-area is used to support the battery cells, and the area ratio of each sub-area relative to the tray is equal.

[0009] In the technical solution of the embodiment of the present application, by dividing the side of the tray used to support the battery cell into multiple sub-areas, and each sub-area occupies an equal ratio of the tray area, the heating power of each sub-area is similar during heating, so that the temperature rise of the battery cells in each sub-area can be more consistent, thereby improving the efficiency of baking and heating the battery cells.

[0010] In some embodiments, the plurality of sub-regions are arranged in a rectangular array.

[0011] Multiple sub-areas are arranged in a rectangular array to facilitate sub-area division.

[0012] In some embodiments, each sub-region is provided with a first positioning groove, and the first positioning groove is used for positioning the battery cell.

[0013] A first positioning groove is provided in the sub-region so as to position the battery cell when supporting the battery cell, thereby stably supporting the battery cell and heating the battery cell.

[0014] In some embodiments, the heating plate includes a heat source plate and a heat conducting plate attached to one side of the heat source plate, and a sub-region is provided on a side of the heat conducting plate facing away from the heat source plate.

[0015] A heat source plate is provided to generate heat to heat the battery cells; and a heat conducting plate is provided to better conduct the heat generated by the heat source plate to the battery cells. Moreover, due to the heat conduction of the heat conducting plate, the heat generated by the heat source plate can be dispersed, so that the heating power per unit area of ​​the heat conducting plate is more consistent. Therefore, when heating multiple battery cells, the heating efficiency of the multiple battery cells can be made more consistent, thereby improving the heating efficiency of the multiple battery cells.

[0016] In some embodiments, the heat source plate is divided into multiple sub-blocks, and the multiple sub-blocks are spliced ​​and connected.

[0017] By splicing multiple sub-blocks to form a heat source plate, each sub-block can be heated separately to better control the heating of the battery cells in the corresponding area of ​​each sub-block, so as to achieve better temperature consistency of the battery cells on the tray and improve the efficiency of baking and heating of the battery cells.

[0018] In some embodiments, the heat source plate includes a thermally conductive adhesive layer and heating wires uniformly distributed in the thermally conductive adhesive layer.

[0019] The heating wire is placed in a thermally conductive adhesive layer, which protects the heating wire. Using a heating wire is easy to manufacture and control, and the heat source plate also has good deformability, allowing it to better fit the thermal conductive plate and facilitate heat transfer to the plate.

[0020] In some embodiments, the thickness of the heat conducting plate ranges from 10 mm to 20 mm.

[0021] By using a heat conducting plate with a thickness of 10mm-20mm, the heat from the heat source plate can be more dispersed during the process of transferring it to the battery cell, so that the temperature on the heat source plate is more uniform. Furthermore, when heating the battery cell, the heating power of each sub-area can be more uniform, so that the temperature rise of the battery cell is more consistent, thereby improving the efficiency of baking and heating the battery cell.

[0022] In some embodiments, the heating plate further includes a support plate, the heat source plate is supported on the support plate, and the support plate is located on a side of the heat source plate facing away from the heat conducting plate.

[0023] A support plate is provided so that the support plate cooperates with the heat conducting plate to clamp the heat source plate, thereby protecting the heat source plate.

[0024] In some embodiments, the heating plate further includes a reflective plate, which is disposed on a side of the heat source plate facing away from the heat conducting plate.

[0025] A reflective plate is provided to reflect the heat radiation generated by the heat source plate to the heat conduction plate to improve the utilization rate of heat.

[0026] In some embodiments, the length of the heat source plate is equal to the length of the heat conducting plate, and the width of the heat source plate is equal to the width of the heat conducting plate.

[0027] Through the above structure, the heat source plate can heat the heat conducting plate more evenly, making the heat of the heat conducting plate more uniform and easier to control, thereby making the heating power of each sub-area more uniform, so that the temperature rise of the battery cell is more consistent, thereby improving the efficiency of baking and heating the battery cell.

[0028] In some embodiments, a cover plate having a heating plate is further included, and the cover plate is used to cover a side of the battery cell away from the tray and heat the battery cell.

[0029] A cover plate is set to cover the battery cell, so that the battery cell is positioned and supported by the tray and the cover plate, and the tray and the cover plate cooperate to heat the battery cell from two opposite directions to increase the speed of baking and heating of the battery cell, thereby improving the efficiency of baking and heating of the battery cell.

[0030] In some embodiments, an electrode terminal is provided on one side of the battery cell, and one of the tray and the cover plate is in contact with the electrode terminal;

[0031] Alternatively, electrode terminals are respectively provided on two opposite sides of the battery cell, and the tray and the cover plate are respectively in contact with the electrode terminals on the two opposite sides of the battery cell.

[0032] Through the above structure, the electrode terminal can be heated. Since the tabs of the electrode assembly in the battery cell are connected to the electrode terminals, the electrode terminals can quickly conduct heat to the tabs. Through the higher thermal conductivity of the tabs, the pole pieces of the electrode assembly can be quickly heated, so that the electrode assembly inside the battery cell can be quickly heated through the electrode terminals to improve the heating efficiency.

[0033] In a second aspect, an embodiment of the present application provides a battery baking device, comprising the battery baking jig as described in the above embodiment.

[0034] In a third aspect, an embodiment of the present application provides a battery production device, including the battery baking jig as described in the above embodiment; or, including the battery baking device as described in the above embodiment.

[0035] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a heating plate, comprising the following steps:

[0036] Providing a first heat conducting plate and a whole heat source plate adapted to the first heat conducting plate, and attaching the whole heat source plate to the first heat conducting plate;

[0037] heating the first heat conducting plate with the entire heat source plate attached thereto to obtain temperature data at various locations on the surface of the first heat conducting plate for supporting the battery cells;

[0038] Dividing the surface into a plurality of sub-regions according to the surface temperature data;

[0039] According to the shape of each sub-region, corresponding sub-blocks of the heat source plate are made;

[0040] Splicing the manufactured sub-blocks to form a spliced ​​heat source plate adapted to the first heat conducting plate;

[0041] A second heat conducting plate is provided, and the combined heat source plate is attached to the second heat conducting plate to obtain a heating plate.

[0042] Through the above method, the heat source plate is spliced ​​with multiple sub-blocks, and the heating of each sub-block can be controlled separately. Therefore, during the heating process of the battery cells, the battery cells in the corresponding areas of each sub-block can be heated in a targeted manner, so that the heating consistency of the battery cells is better, thereby improving the efficiency of baking and heating the battery cells.

[0043] In some embodiments, dividing the surface into a plurality of sub-regions based on temperature data of the surface includes:

[0044] According to the temperature data of the surface, the temperature difference data of the surface and the average temperature of the surface are obtained. According to the temperature difference data and the average temperature, and by setting a temperature gradient, the surface is divided into a plurality of sub-regions.

[0045] Through the above method, the shape of each sub-area can be better set, and then sub-blocks of corresponding shapes can be made to better control the power and temperature of each sub-block during use, so as to make the temperature rise of the battery cell more consistent and improve the efficiency of baking and heating the battery cell.

[0046] In some embodiments, dividing the surface into a plurality of sub-regions based on temperature data of the surface includes:

[0047] According to the surface temperature data, the surface temperature difference data is obtained, and according to the temperature data when the surface temperature difference is the largest, the surface is divided into multiple sub-regions.

[0048] The surface is divided into regions according to the temperature data when the temperature difference is the largest, and the division of each region is more accurate.

[0049] In some embodiments, before obtaining the heating plate, the method further comprises the steps of:

[0050] According to the temperature data of the entire surface, a temperature collection point is set at each sub-block corresponding to the average temperature of the sub-region.

[0051] Setting a temperature collection point on each sub-block can facilitate the collection of the temperature on each sub-block, so that during the heating process, the heating power of each sub-block can be adjusted according to the temperature difference of different sub-blocks, thereby making the heating consistency of multiple battery cells better and improving the efficiency of battery cell baking and heating.

[0052] In some embodiments, the temperature collection point is provided with a temperature sensor.

[0053] Temperature sensors are set at the temperature collection points to facilitate the detection of the average temperature of each sub-block, thereby facilitating the control of the heating power and temperature of each sub-block.

[0054] In some embodiments, the sub-block includes a thermal conductive adhesive layer and heating wires uniformly distributed in the thermal conductive adhesive layer.

[0055] The heating wire is placed in a thermally conductive adhesive layer, which protects the heating wire. Using a heating wire is easy to manufacture and control, and the sub-blocks of the heat source plate have good deformability, allowing them to better fit with the second heat conducting plate, facilitating heat transfer to the second heat conducting plate.

[0056] In some embodiments, before obtaining the heating plate, the method further comprises the steps of:

[0057] A support plate is provided, and the split heat source plate is attached to the support plate, and the support plate is located on a side of the split heat source plate away from the second heat conducting plate.

[0058] A support plate is provided so that the support plate cooperates with the second heat conducting plate to clamp the split heat source plate, thereby protecting the split heat source plate.

[0059] In some embodiments, before obtaining the heating plate, the method further comprises the steps of:

[0060] A reflective plate is provided and arranged on a side of the combined heat source plate facing away from the second heat conducting plate.

[0061] A reflective plate is provided to reflect the heat radiation generated by the combined heat source plate toward the second heat conducting plate, thereby improving the utilization rate of heat.

[0062] In some embodiments, before heating the first heat conducting plate with the entire heat source plate attached thereto, the method further comprises:

[0063] The battery cells are placed on the first heat conducting plate.

[0064] A battery cell is arranged on the first heat conducting plate, so that when heating, the first heat conducting plate with the heat source plate can better simulate the actual heating of the battery cell, thereby making the division of each sub-area more accurate, and then when each sub-block is heated in a targeted manner, the temperature of the battery cell can be made more consistent, thereby improving the efficiency of battery cell heating.

[0065] In some embodiments, the step of heating the first heat conducting plate to which the entire heat source plate is attached comprises:

[0066] The first heat conducting plate with the whole heat source plate attached thereto is placed in a baking oven for heating.

[0067] Heating in an oven can better simulate the environment in which a hot plate is used.

[0068] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0070] FIG1 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0071] FIG2 is a schematic structural diagram of a battery baking device according to some embodiments of the present application;

[0072] FIG3 is a schematic diagram of the structure of a battery baking jig supporting a battery cell according to some embodiments of the present application;

[0073] FIG4 is a schematic structural diagram of the battery baking jig and the battery cell in FIG3 being separated;

[0074] FIG5 is a schematic diagram of the exploded structure of a heating plate according to some embodiments of the present application;

[0075] FIG6 is a schematic structural diagram of a heat source plate according to some embodiments of the present application;

[0076] FIG7 is a schematic diagram of the exploded structure of a heating plate according to some other embodiments of the present application;

[0077] FIG8 is a schematic diagram of the exploded structure of a heating plate according to some other embodiments of the present application;

[0078] FIG9 is a schematic diagram of the exploded structure of a battery baking jig according to other embodiments of the present application;

[0079] FIG10 is a schematic diagram of the exploded structure of a battery baking jig according to some further embodiments of the present application;

[0080] FIG11 is a schematic diagram of the exploded structure of a battery baking jig according to some other embodiments of the present application;

[0081] FIG12 is a schematic diagram of the exploded structure of a battery baking jig according to other embodiments of the present application.

[0082] Among them, the main marks of the drawings in the figure are:

[0083] 1000-battery baking device;

[0084] 100 - battery cell; 11 - electrode assembly; 111 - tab; 12 - housing; 121 - end cap; 122 - casing; 13 - electrode terminal; 14 - adapter; 15 - support plate; 16 - protective film; 101 - first surface; 102 - second surface;

[0085] 200 - battery baking fixture; 20 - heating plate; 210 - tray; 2101 - sub-area; 21 - contoured surface; 211 - first positioning groove; 212 - groove; 201 - heat conducting plate; 202 - heat source plate; 2020 - sub-block; 2021 - thermally conductive adhesive layer; 2022 - heating wire; 203 - support plate; 204 - reflective plate; 220 - cover plate; 22 - adapting surface; 221 - second positioning groove; 222 - receiving groove;

[0086] 300-baking oven;

[0087] X-width direction; Y-thickness direction; Z-height direction. DETAILED DESCRIPTION

[0088] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0092] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0094] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0095] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0096] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0097] In the description of the embodiments of this application, unless otherwise specified or limited, the technical term "adjacent" refers to proximity in position. For example, if there are three components A1, A2, and B, and the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, that is, A2 is adjacent to B, or B is adjacent to A2. For another example, when there are multiple components C, the multiple components C are C1, C2, ..., C N , when one of the C components, such as C2, is closer to the B component than other C components, then B is adjacent to C2, or it can be said that C2 is adjacent to B.

[0098] In the embodiments of the present application, battery cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shapes of battery cells include, but are not limited to, cylindrical, flat, rectangular, or other shapes. Battery cells are generally categorized by packaging method, including, but not limited to, cylindrical, prismatic, and pouch-type battery cells.

[0099] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. The battery generally includes a casing for encapsulating one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells. In some cases, the battery cells can also be used directly, that is, the battery may not include a casing, which is not limited here.

[0100] The battery cell in the embodiment of the present application includes an electrode assembly and a shell. The electrode assembly is installed in the shell, and the electrode assembly is protected by the shell.

[0101] An electrode assembly, also known as a battery cell, generally consists of electrode sheets and separators. The electrode sheets include positive and negative electrodes. The electrode assembly primarily operates by the movement of metal ions between the positive and negative electrodes. The electrode sheets consist of a current collector and an active material layer. The active material layer is coated on the surface of the current collector. The uncoated portion of the current collector protrudes from the coated portion. This portion serves as a tab, or a metal conductor is welded to the current collector and extended to serve as the tab. For example, a positive electrode sheet consists of a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the current collector. The uncoated portion of the current collector protrudes from the coated portion. This portion serves as a positive tab, or a metal conductor is welded to the current collector and extended to serve as the positive tab. For example, in lithium-ion batteries, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is applied to the surface of the negative current collector. The portion of the negative current collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion not coated with the negative active material layer serves as the negative electrode tab, or a metal conductor is welded to the negative current collector and extended to serve as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. It is understood that the electrode assembly can have one positive electrode tab and one negative electrode tab. In other words, the electrode assembly is provided with two sets of tabs, each containing at least one tab, with one set being the positive electrode tab and the other being the negative electrode tab.

[0102] The electrode assembly can be a wound structure or a laminated structure. The embodiments of the present application are not limited to this. The wound structure is mostly to weld the tabs to the current collector, and then arrange them in the order of positive electrode sheet - diaphragm - negative electrode sheet - diaphragm; and then form a cylindrical or square battery cell by winding. The laminated structure is mostly to lead out the tabs on the current collector, arrange the positive electrode sheet, negative electrode sheet and diaphragm in the order of positive electrode sheet - diaphragm - negative electrode sheet - diaphragm, and stack them layer by layer to form a laminated battery cell; wherein, the diaphragm can be cut and directly laminated with the diaphragm sheet, or the diaphragm is not cut, but laminated in a Z-shaped fold. The material of the diaphragm can be PP (Polypropylene, polypropylene) or PE (Polyethylene, polyethylene), etc. The diaphragm is an insulating film arranged between the positive electrode sheet and the negative electrode sheet. Its main function is to isolate the positive and negative electrodes and prevent the electrons in the battery from passing freely to prevent short circuits, while allowing the ions in the electrolyte to pass freely between the positive and negative electrodes to form a loop between the positive and negative electrodes. The positive electrode tab and the negative electrode tab are collectively referred to as the tab.

[0103] After the electrode assembly is manufactured and installed in the housing, electrolyte must be injected to immerse the electrode assembly and allow it to fully absorb the electrolyte. The electrolyte provides some active ions that serve as conductive ions during the charge and discharge process. In addition, the electrolyte provides ion channels, or carriers, allowing ions to move freely through them, thereby achieving electrical conduction between the electrodes.

[0104] Because the active material layer is coated on the surface of the current collector and formed into an electrode assembly, the active material layer of the electrode sheet contains a lot of water. This makes it difficult for the electrode assembly to fully absorb the electrolyte after injection, or it is difficult to control the amount of electrolyte injected. Therefore, before adding electrolyte to the battery cell, the battery cell needs to be baked to remove moisture from the electrode assembly.

[0105] Battery cells are typically placed on a baking tray, which supports them, and then baked in a baking oven. During the baking process, the battery cells are heated to a set temperature, then kept warm, and the oven is evacuated to remove moisture.

[0106] However, during baking, the heat from the baking tray is not only transferred to the battery cells, but also to the surrounding environment. If the battery cells are placed in different positions on the baking tray, or if the battery cells are placed at different densities, the speed at which heat is dissipated to the surrounding environment will also be different, and the speed at which heat is transferred to each battery cell will also be different. The tray will heat different battery cells with different power, resulting in poor heating consistency of the battery cells and slower heating efficiency.

[0107] Based on the above considerations, in order to solve the problem of poor consistency in the heating and baking of battery cells, which leads to slow heating efficiency, the embodiment of the present application improves a battery baking jig. By dividing the side of the tray used to support the battery cells into multiple sub-areas, the ratio of the tray area occupied by each sub-area is set to be equal. During heating, the heating power of each sub-area is similar, so that the temperature of the battery cells in each sub-area can be made more consistent, thereby shortening the heating time of the battery cells and improving the efficiency of the baking and heating of the battery cells.

[0108] The battery baking jig disclosed in the embodiments of the present application can be used in a battery baking device during the battery production process, and can also be used in battery production equipment such as a battery production line and a battery production inspection.

[0109] Please refer to FIG. 1 , which is a schematic diagram of the exploded structure of a battery cell 100 provided in some embodiments of the present application.

[0110] The battery cell 100 includes an electrode assembly 11 and a housing 12 , in which the electrode assembly 11 is mounted. The housing 12 is a shell structure having an inner space, in which the electrode assembly 11 is placed to be protected.

[0111] The battery cell 100 has a height direction, a width direction, and a thickness direction. In the figure, the Z direction is the height direction of the battery cell 100, the X direction is the width direction of the battery cell 100, and the Y direction is the thickness direction of the battery cell 100. The electrode assembly 11 is installed in the housing 12 of the battery cell 100. The height direction of the battery cell 100 is consistent with the height direction of the electrode assembly 11, and the height direction of the battery cell 100 is consistent with the height direction of the housing 12; the width direction of the battery cell 100 is consistent with the width direction of the electrode assembly 11, and the width direction of the battery cell 100 is consistent with the width direction of the housing 12; the thickness direction of the battery cell 100 is consistent with the thickness direction of the electrode assembly 11, and the thickness direction of the battery cell 100 is consistent with the thickness direction of the housing 12.

[0112] In some embodiments, the housing 12 includes a shell 122 and an end cover 121 , and the end cover 121 covers the shell 122 .

[0113] The end cap 121 refers to a component that covers the opening of the shell 122 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 121 can be adapted to the shape of the shell 122 so as to fit on the shell 122. Optionally, the end cap 121 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 121 is not easily deformed when squeezed or collided, so that the battery cell 100 can have higher structural strength and improved reliability. The material of the end cap 121 can also be a variety of materials, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0114] The shell 122 is a component used to cooperate with the end cover 121 to form the internal environment of the battery cell 100, wherein the internal environment formed can be used to accommodate the electrode assembly 11, electrolyte and other components. The shell 122 and the end cover 121 can be independent components, and an opening can be set on the shell 122, and the internal environment of the battery cell 100 is formed by covering the opening with the end cover 121. The shell 122 can be of various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the shell 122 can be determined according to the specific shape and size of the battery cell 100. The material of the shell 122 can be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0115] The shell 122 and the end cover 121 are arranged to form the outer shell 12, which is convenient for processing and manufacturing, and also convenient for installing the electrode assembly 11 in the outer shell 12, thereby facilitating assembly.

[0116] In some embodiments, the battery cell 100 further includes a support plate 15, which is mounted in the housing 122 and supports the electrode assembly 11 to stably support the electrode assembly 11 in the housing 122. The support plate 15 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0117] In some embodiments, the battery cell 100 further includes a protective film 16, which is wrapped around the electrode assembly 11 to protect the electrode assembly 11. This, to a certain extent, effectively prevents the electrode assembly 11 from becoming loose. If the protective film 16 has insulating properties, it can also provide insulation protection for the electrode assembly 11, reducing the risk of a short circuit between the electrode assembly 11 and the housing 122.

[0118] In some embodiments, the protective film 16 may be made of a film such as PET (polyethylene glycol terephthalate), or may be made of a PP film, a PE film, or the like.

[0119] In some embodiments, the outer shell 12 of the battery cell 100 is provided with an electrode terminal 13. For example, the electrode terminal 13 can be provided on a side wall of the outer shell 12. For example, when the outer shell 12 includes a housing 122 and an end cap 121, the electrode terminal 13 can be provided on the end cap 121. Of course, the electrode terminal 13 can also be provided on a side wall of the housing 122. The electrode terminal 13 is electrically connected to the tab 111.

[0120] The electrode terminal 13 is a conductive member connected to the tab 111 of the electrode assembly 11 to output electrical energy from the battery cell 100 or to charge the battery cell 100. A battery cell 100 generally has two electrode terminals 13, one connected to the positive tab and the other to the negative tab of the electrode assembly 11. The electrode terminal 13 connected to the positive tab is the positive electrode terminal, and the electrode terminal 13 connected to the negative tab is the negative electrode terminal.

[0121] In some embodiments, referring to FIG. 1 , the battery cell 100 further includes two adapter plates 14 . The two adapter plates 14 correspond to the two electrode terminals 13 , respectively. Each adapter plate 14 is connected to a corresponding electrode terminal 13 , and each adapter plate 14 is connected to a corresponding tab 111 . In other words, each tab 111 is connected to a corresponding electrode terminal 13 via the adapter plate 14 , facilitating the connection between the tab 111 and the electrode terminal 13 and providing a more stable connection. For ease of description, the adapter plate 14 connected to the positive electrode terminal is referred to as the positive adapter plate, and the positive tab is connected to the positive adapter plate; the adapter plate 14 connected to the negative electrode terminal is referred to as the negative adapter plate, and the negative tab is connected to the negative adapter plate.

[0122] Of course, in some embodiments, the electrode terminal 13 may also be directly connected to the corresponding electrode tab 111 by welding.

[0123] Referring to Figure 2, some embodiments of the present application provide a battery baking device 1000 comprising a baking oven 300 and a battery baking jig 200. The battery baking jig 200 is used to support and heat the battery cells 100. After the battery cells 100 are mounted on the battery baking jig 200, they are placed entirely within the baking oven 300 for heating and baking. Furthermore, the provision of the baking oven 300 to bake the battery baking jig 200 and the battery cells 100 provides a more stable baking environment, thereby improving the heating efficiency of the battery cells 100. It also facilitates the extraction of ambient air during the heat preservation phase, thereby improving the efficiency of removing moisture from the battery cells 100.

[0124] Please refer to Figures 3 to 6. Figure 3 is a schematic diagram of the structure of a battery baking jig 200 supporting a battery cell 100 in some embodiments of the present application. Figure 4 is a schematic diagram of the structure of the battery baking jig 200 and the battery cell 100 separated in some embodiments of the present application. Figure 5 is a schematic diagram of the exploded structure of the heating plate 20 in some embodiments of the present application. Figure 6 is a schematic diagram of the structure of the heat source plate 202 in some embodiments of the present application.

[0125] Some embodiments of the present application provide a battery baking jig 200, comprising a tray 210 having a heating plate 20, the tray 210 being used to support and heat a battery cell 100; a side of the tray 210 used to support the battery cell 100 is divided into a plurality of sub-areas 2101, each sub-area 2101 being used to support the battery cell 100, and the area ratio of each sub-area 2101 relative to the tray 210 being equal.

[0126] The heating plate 20 is a plate-shaped member that can heat the battery cells 100. The heating plate 20 can passively heat the battery cells 100. For example, the heating plate 20 can be made of a material with a high thermal conductivity, such as copper or aluminum. When the heating plate 20 is located in a heated environment, its high thermal conductivity can more easily concentrate heat, thereby raising the temperature and, due to the temperature difference, heating the battery cells 100. The heating plate 20 can also actively heat the battery cells 100. For example, a heat source is provided in the heating plate 20 to actively generate heat to heat the battery cells 100.

[0127] The tray 210 refers to a plate-like structure used to support and heat the battery cell 100. The tray 210 can be made of the heating plate 20, or the heating plate 20 can be a partial structure of the tray 210. That is, the tray 210 can be made of the heating plate 20 and other components. The other components can be structures such as non-slip thermal conductive glue to stably support the battery cell 100 and better heat the battery cell 100. When in use, the battery cell 100 is placed on the tray 210 and supported by the tray 210.

[0128] The sub-region 2101 refers to a local area on one side of the tray 210 used to support the battery cells 100 .

[0129] The area ratio of the sub-region 2101 to the tray 210 refers to the ratio of the area of ​​the sub-region 2101 to the area of ​​the surface of the tray 210 used to support the battery cells 100 .

[0130] By dividing the side of the tray 210 used to support the battery cell 100 into multiple sub-areas 2101, and each sub-area 2101 occupies an equal area ratio of the tray 210, since the area of ​​the tray 210 is fixed, the area of ​​each sub-area 2101 is equal. Therefore, when heating, the heating power of each sub-area 2101 is similar, which can make the temperature rise of the battery cell 100 in each sub-area 2101 more consistent, thereby improving the baking and heating efficiency of the battery cell 100.

[0131] In some embodiments, the plurality of sub-regions 2101 are arranged in a rectangular array.

[0132] Arranging the plurality of sub-regions 2101 in a rectangular array facilitates dividing the side of the tray 210 used to support the battery cells 100 into the sub-regions 2101 , and also makes it easier to evenly set the areas of the sub-regions 2101 to be equal.

[0133] In some embodiments, each sub-region 2101 is provided with a first positioning groove 211 , and the first positioning groove 211 is used for positioning the battery cell 100 .

[0134] The first positioning groove 211 refers to the groove structure of the sub-area 2101 provided on the tray 210, and the size and shape of the first positioning groove 211 are adapted to the shape of the side of the battery cell 100 supported on the tray 210. In this way, when installing the battery cell 100, the battery cell 100 can be placed in the first positioning groove 211, and the battery cell 100 can be positioned by the first positioning groove 211 so as to stably support the battery cell 100.

[0135] A first positioning groove 211 is provided in the sub-region 2101 to position the battery cell 100 when supporting the battery cell 100 , thereby stably supporting the battery cell 100 and heating the battery cell 100 .

[0136] In some embodiments, the plurality of first positioning slots 211 are distributed in an array on the entire tray 210 .

[0137] Distributing the plurality of first positioning grooves 211 in an array can make the heating power received by each battery cell 100 more uniform, so that the heating efficiency of the plurality of battery cells 100 is more consistent, thereby improving the heating efficiency of the plurality of battery cells 100.

[0138] In some embodiments, the area ratios of the first positioning grooves 211 to the corresponding sub-regions 2101 are equal, so that the sizes of the battery cells 100 to be heated in each sub-region 2101 are equal, thereby making the heating speed of the battery cells 100 in each sub-region 2101 more consistent.

[0139] In some embodiments, the depth range of the first positioning groove 211 can be 0-20 mm, such as the depth of the first positioning groove 211 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc., so as to position the battery cell 100.

[0140] In some embodiments, the heating plate 20 includes a heat source plate 202 and a heat conducting plate 201 attached to one side of the heat source plate 202 . A sub-region 2101 is provided on the side of the heat conducting plate 201 facing away from the heat source plate 202 .

[0141] The heat source plate 202 refers to a plate with a heating function, such as a heating wire, a heat pipe, etc. provided in the plate.

[0142] The heat conducting plate 201 refers to a plate with heat conducting properties, such as a copper plate, an aluminum plate, etc.

[0143] A heat source plate 202 is provided to generate heat to heat the battery cells 100; and a heat conducting plate 201 is provided to better conduct the heat generated by the heat source plate 202 to the battery cells 100. Moreover, due to the heat conduction of the heat conducting plate 201, the heat generated by the heat source plate 202 can be dispersed, so that the heating power per unit area of ​​the heat conducting plate 201 is more consistent. Therefore, when heating multiple battery cells 100, the heating efficiency of the multiple battery cells 100 can be made more consistent, thereby improving the heating efficiency of the multiple battery cells 100.

[0144] In some embodiments, the heat source plate 202 includes a thermally conductive adhesive layer 2021 and heating wires 2022 evenly distributed in the thermally conductive adhesive layer 2021 .

[0145] The heating wire 2022 is a metal wire or conductive wire that can generate heat when powered. The thermal conductive adhesive layer 2021 can be a thermal conductive rubber or thermal conductive silicone, etc., which can conduct the heat generated by the heating wire 2022 to quickly conduct the heat to the heat conducting plate 201.

[0146] The heating wires 2022 are evenly distributed within the thermally conductive adhesive layer 2021. This means that the heating wires 2022 occupy a certain proportion per unit area of ​​the thermally conductive adhesive layer 2021, and the spacing between any two adjacent heating wires 2022 is equal. Evenly distributing the heating wires 2022 within the thermally conductive adhesive layer 2021 ensures more uniform heat generation by the heat source plate 202, and thus more uniform heat distribution on the side of the thermally conductive plate 201 supporting the battery cells 100.

[0147] The heating wire 2022 is placed in the thermally conductive adhesive layer 2021, which protects the heating wire 2022. The use of the heating wire 2022 is convenient for processing and manufacturing, and also facilitates controlling the heat generated by the heating wire 2022. Furthermore, the heat source plate 202 has good deformability, allowing it to better fit the thermally conductive plate 201, thereby facilitating heat transfer to the thermally conductive plate 201.

[0148] In some embodiments, the heat source plate 202 is made using a thermally conductive adhesive layer 2021 and a heating wire 2022, so that the thickness of the heat source plate 202 can be made smaller, and the thickness of the heat source plate 202 can even be made between 1 mm and 2 mm. For example, the thickness of the heat source plate 202 can be made to be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc., thereby reducing the thickness of the heating plate 20.

[0149] In some embodiments, the thickness of the heat conducting plate 201 ranges from 10 mm to 20 mm. For example, the thickness of the heat conducting plate 201 may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0150] Since heat will be dispersed when it is transmitted in the heat conducting plate 201, using a heat conducting plate 201 with a thickness of 10mm-20mm can not only make the thickness of the heat conducting plate 201 smaller, reduce the material and weight of the heat conducting plate 201, and reduce costs, but also make the temperature on the heat source plate 202 more uniform. Therefore, when heating the battery cell 100, the heating power of each sub-region 2101 can be made more uniform, so that the temperature rise of the battery cell 100 is more consistent, thereby improving the baking and heating efficiency of the battery cell 100.

[0151] In some embodiments, the heating plate 20 further includes a support plate 203 , on which the heat source plate 202 is supported, and the support plate 203 is located on a side of the heat source plate 202 facing away from the heat conducting plate 201 .

[0152] The support plate 203 is a plate member used to support the heat source plate 202. The support plate 203 is provided on the side of the heat source plate 202 facing away from the heat conducting plate 201, so as to support the heat source plate 202 through the support plate 203. The support plate 203 can be made of a copper plate, an aluminum plate, or other plate members.

[0153] The support plate 203 is provided so that the support plate 203 cooperates with the heat conducting plate 201 to clamp the heat source plate 202 , thereby protecting the heat source plate 202 .

[0154] In some embodiments, the support plate 203 may be made of a heat-insulating material to provide heat preservation, reduce heat loss, and improve heat utilization, thereby better heating the battery cell 100 .

[0155] In some embodiments, the support plate 203 can be a plate with a thickness of 1mm-3mm, such as a support plate 203 with a thickness of 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc., so that the support plate 203 has a certain structural strength to support the heat source plate 202, and the thickness of the support plate 203 can be smaller to reduce the material and weight of the support plate 203 and reduce costs.

[0156] In some embodiments, the heating plate 20 further includes a reflective plate 204 . The reflective plate 204 is disposed on a side of the heat source plate 202 facing away from the heat conducting plate 201 .

[0157] The reflector 204 is a plate used to reflect light.

[0158] The reflective plate 204 is provided to reflect the heat radiation generated by the heat source plate 202 toward the heat conducting plate 201 , so as to improve the utilization rate of heat.

[0159] In some embodiments, the reflective plate 204 can be made of a plate with a thickness of 0.5mm-2mm, such as a reflective plate 204 with a thickness of 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc., so that the reflective plate 204 has a certain thickness and strength to be arranged on the side of the heat source plate 202 away from the heat conduction plate 201, and the thickness of the reflective plate 204 can be made smaller to reduce the material and weight of the reflective plate 204 and reduce costs.

[0160] In some embodiments, when the heating plate 20 includes a reflective plate 204 and a support plate 203, the reflective plate 204 is arranged on the side of the support plate 203 away from the heat source plate 202, so that the heat dissipated from the support plate 203 in the direction away from the heat conducting plate 201 can be reflected by the reflective plate 204, thereby improving the utilization rate of heat.

[0161] In some embodiments, the length of the heat source plate 202 is equal to the length of the heat conducting plate 201 , and the width of the heat source plate 202 is equal to the width of the heat conducting plate 201 .

[0162] Through the above structure, the heat source plate 202 can heat the heat conducting plate 201 more evenly, making the heat of the heat conducting plate 201 more uniform and easier to control, thereby making the heating power of each sub-area 2101 more uniform, so that the temperature rise of the battery cell 100 is more consistent, thereby improving the efficiency of baking and heating the battery cell 100.

[0163] Please refer to Figures 7 and 8. Figure 7 is a schematic diagram of the exploded structure of the heating plate 20 provided in some embodiments of the present application. Figure 8 is a schematic diagram of the exploded structure of the heating plate 20 provided in other embodiments of the present application.

[0164] In some embodiments, the heat source plate 202 is divided into a plurality of sub-blocks 2020 , and the plurality of sub-blocks 2020 are spliced ​​together.

[0165] Sub-blocks 2020 refer to smaller heat source plates 202. Multiple sub-blocks 2020 are assembled to form a heat source plate 202, allowing for individual heating of each sub-block 2020 to better control the heating of the battery cells 100 in the corresponding area of ​​each sub-block 2020. This allows for more consistent heating of the battery cells 100 on the tray 210, thereby improving the efficiency of baking and heating the battery cells 100.

[0166] In some embodiments, please also refer to FIG. 6 . When the heat source plate 202 is spliced ​​with multiple sub-blocks 2020 , each sub-block 2020 includes a thermal conductive adhesive layer 2021 and a heating wire 2022 .

[0167] Please refer to Figure 7. In some embodiments, the heat source plate 202 is divided into multiple sub-blocks 2020 from the middle to the edge. The middle sub-block 2020 is located in an area in the middle of the width and length directions of the heating plate 20; the other sub-blocks 2020 are all arranged in a frame shape and are arranged in sequence from the inside to the outside, that is, the inner sub-block 2020 is located inside the outer sub-block 2020.

[0168] Referring to FIG. 8 , in some embodiments, the heat source plate 202 is divided into a plurality of sub-blocks 2020 along the length direction so as to control the temperature at different positions along the length direction of the heating plate 20 to facilitate heating of the battery cells 100 .

[0169] Referring to FIG. 2 and FIG. 6 to FIG. 8 , in some embodiments, when the heat source plate 202 is assembled using multiple sub-blocks 2020 , the shape and arrangement of each sub-block 2020 may be as follows:

[0170] A first heat conducting plate and a whole heat source plate are provided. The whole heat source plate is adapted to the size of the first heat conducting plate. The whole heat source plate is attached to the first heat conducting plate and then heated to simulate the environment and temperature rise process of heating a battery cell 100. The first heat conducting plate must have the same structure as the heat conducting plate 201 in the desired heating plate 20.

[0171] The temperature of the surface of the first heat conducting plate supporting the battery cells 100 is detected to obtain temperature data at various locations on the surface. Based on this surface temperature data, the surface temperature of the first heat conducting plate is divided into regions, and corresponding small heat source plates are then provided. These small heat source plates can be referred to as sub-blocks 2020. Multiple sub-blocks 2020 corresponding to the regions are then spliced ​​together to form a combined heat source plate 202. The power and temperature of each sub-block 2020 can then be controlled separately, thereby achieving more uniform heating of the battery cells 100 in the corresponding regions of each sub-block 2020. The combined heat source plate 202 is the heat source plate 202 used by the heating plate 20 of the battery baking jig 200.

[0172] In some embodiments, when heating the first heat conducting plate with the entire heat source plate attached thereto, the entire plate can be placed in a baking oven 300 for heating to better simulate the use environment of the heating plate 20 to be manufactured.

[0173] In some embodiments, during the heating process of the first heat conducting plate, temperature data at various locations on the surface may be recorded, which facilitates analysis of changes in the surface temperature of the first heat conducting plate at different times.

[0174] In some embodiments, the surface of the first heat conducting plate can be divided into regions based on the temperature data at the time of maximum surface temperature difference. The time at which the surface temperature difference of the first heat conducting plate is maximum is determined. The time at which the surface temperature difference of the first heat conducting plate is maximum indicates that the surface of the first heat conducting plate is heated most unevenly at that time. Thus, by dividing the surface temperature of the first heat conducting plate into regions at this time, the resulting sub-blocks 2020 can better control the temperature rise at different times, thereby ensuring more uniform heating of the battery cells 100 in the corresponding areas of each sub-block 2020.

[0175] In some embodiments, the division of each sub-region can be based on the surface temperature data of the first heat conduction plate to obtain the surface temperature difference data and average temperature, and then the surface can be divided into sub-regions based on the temperature difference data and average temperature, as well as the set temperature gradient, which can facilitate the division of the sub-regions.

[0176] In some embodiments, the division of each sub-region can be based on the temperature data when the temperature difference across the entire surface of the first heat conducting plate is at its maximum. When the temperature difference across the entire surface of the first heat conducting plate is at its maximum, the average temperature of the surface is P, the maximum temperature of the surface is F1, and the minimum temperature of the surface is F2. Then P = (F1 + F2) / 2. Set the temperature gradient of the sub-region as 2T. That is to say, when partitioning, the difference in the average temperatures of two adjacent sub-regions with similar temperatures is 2T. Then the insulation value of the upper and lower limits of the temperature range of the sub-region relative to the average temperature of the sub-region is T. With the temperature range of P + 2KT ± T, divide the entire surface of the first heat conducting plate into N sub-regions, where N is an odd number and K is an integer. Then P + 2│K│T < F1 < P + 2│K│T + T, │K│ is the absolute value of K, and (F1 - P) / T ≤ N < (F1 - P) / T + 2. According to the above temperature range and temperature gradient, divide the shapes of each sub-region, and respectively manufacture corresponding sub-blocks 2020 of the heat source plate according to the shapes of each sub-region. Then splice the manufactured sub-blocks 2020 to form a spliced heat source plate 202 adapted to the first heat conducting plate. This spliced heat source plate 202 can control the heating temperatures of each sub-block 2020 respectively. The spliced heat source plate 202 is the heat source plate 202 used for the heating plate 20 of the battery baking fixture 200. When applied to the heating plate 20, the spliced heat source plate 202 can be fitted to the first heat conducting plate to heat the first heat conducting plate, and further heat the battery cells 100 on the first heat conducting plate. The above temperature range of P + 2KT ± T refers to the temperature range from P + 2KT - T to P + 2KT + T.

[0177] For example, when the above temperature gradient 2T = 2°C; when K = 0, the temperature range region of P + 2KT ± T = P ± 1°C corresponds to the first sub-region; when K = 1, the temperature range region of P + 2KT ± T = P + 2°C ± 1°C corresponds to the second sub-region; when K = -1, the temperature range region of P + 2KT ± T = P - 2°C ± 1°C corresponds to the third sub-region; when K = 2, the temperature range region of P + 2KT ± T = P +​​​​

[0179] In some embodiments, before heating the first heat conduction plate, a battery cell 100 can be set on the first heat conduction plate. In this way, during heating, the temperature data of the surface of the first heat conduction plate during the heating process of the battery cell 100 can be more realistically detected, thereby making the division of temperature zones more accurate. When each sub-block 2020 is heated in a targeted manner, the heating consistency of the battery cell 100 can be better, thereby improving the baking and heating efficiency of the battery cell 100.

[0180] In some embodiments, temperature collection points can be set at the average temperature of each sub-block 2020, corresponding to the average temperature of each sub-region, based on the temperature data at the time of maximum temperature difference across the entire surface. This facilitates temperature collection on each sub-block 2020 during use, allowing the heating power of each sub-block 2020 to be adjusted based on the temperature difference between different sub-blocks 2020 during the heating process. This improves the consistency of temperature rise across multiple battery cells 100 and enhances the efficiency of baking and heating the battery cells 100.

[0181] In some embodiments, a temperature sensor may be provided at a temperature collection point to facilitate detection of the average temperature of each sub-block 2020 , thereby facilitating control of the heating power and temperature of each sub-block 2020 .

[0182] In some embodiments, the temperature of the temperature collection point of each sub-block 2020 may also be detected by an external temperature sensor during use.

[0183] During use, the temperature collected at the average temperature of the sub-block 2020 corresponding to the temperature range of P+2KT±T ​​when K=0 can be used as the reference temperature. If the temperature of some other temperature collection points in the sub-block 2020 is higher than the reference temperature, the power of the sub-block 2020 is reduced; if the temperature of some other temperature collection points in the sub-block 2020 is lower than the reference temperature, the power of the sub-block 2020 is increased.

[0184] In some embodiments, when the heat source plate 202 is assembled using multiple sub-blocks 2020, each sub-block 2020 can be made using a heating wire 2022 disposed in a thermally conductive adhesive layer 2021. In other words, the sub-block 2020 includes a thermally conductive adhesive layer 2021 and heating wires 2022 evenly distributed in the thermally conductive adhesive layer 2021.

[0185] The heating wire 2022 is placed within the thermally conductive adhesive layer 2021, which protects the heating wire 2022. The use of the heating wire 2022 facilitates manufacturing and also facilitates controlling the heat generated by the heating wire 2022. Furthermore, the sub-block 2020 of the heat source plate 202 exhibits excellent deformability, allowing for better conformity to the heat conducting plate 201, facilitating heat transfer to the heat conducting plate 201.

[0186] Please refer to FIG. 9 , which is a schematic diagram of the exploded structure of a battery baking jig 200 and a battery cell 100 according to some embodiments of the present application.

[0187] In some embodiments, the battery baking jig 200 further includes a cover plate 220 having a heating plate 20 . The cover plate 220 is used to cover a side of the battery cells 100 away from the tray 210 and heat the battery cells 100 .

[0188] The cover plate 220 refers to a plate-like structure used to cover the side of the battery cell 100 of the tray 210 away from the tray 210 and heat the battery cell 100. The cover plate 220 can be made of the heating plate 20, or the heating plate 20 can be a partial structure of the cover plate 220, that is, the cover plate 220 can be made of the heating plate 20 and other components together. The other components can be structures such as non-slip thermal conductive glue to stabilize the battery cell 100 and better heat the battery cell 100. In this way, the tray 210 supports the battery cell 100, and the battery cell 100 is located between the tray 210 and the cover plate 220. When heating the battery cell 100, the tray 210 heats the battery cell 100 toward the cover plate 220, and the cover plate 220 heats the battery cell 100 toward the tray 210, so as to heat the battery cell 100 faster and improve the heating efficiency of the battery cell 100.

[0189] A cover plate 220 is set to cover the battery cell 100, so that the battery cell 100 is positioned and supported by the tray 210 and the cover plate 220, and the tray 210 and the cover plate 220 cooperate to heat the battery cell 100 from two opposite directions to increase the baking and heating speed of the battery cell 100, thereby improving the baking and heating efficiency of the battery cell 100.

[0190] Since the electrode assembly 11 tends to expand when absorbing electrolyte and during charging, when the electrode assembly 11 is manufactured and installed in the shell 12, the size of the electrode assembly 11 is smaller than the internal space of the shell 12, which results in gaps between the electrode assembly 11 and the inner surface of the shell 12, and air exists in these gaps.

[0191] During heating, one side of the battery cell 100 is supported on the baking jig. The baking jig heats one side of the outer shell 12 of the battery cell 100. The heat is then transferred through this side of the outer shell 12 to the air inside the outer shell 12, and then to the electrode assembly 11. This heat is then transferred to the electrode assembly 11, heating the electrode assembly 11 until the temperature of the entire electrode assembly 11 reaches the set temperature range. This heat is then retained. For example, the bottom side of the battery cell 100 in the height direction Z can be supported on the baking jig. Heat enters the outer shell 12 from the bottom side and is transferred to the air in the gap between the outer shell 12 and the bottom of the electrode assembly 11. The heat is then transferred to the bottom of the electrode assembly 11 and upward until the temperature of the entire electrode assembly 11 reaches the set temperature range. This heat is then retained. Alternatively, the battery cell 100 can be supported on the baking jig in the thickness direction Y, heating the battery cell 100 along the thickness direction Y. This approach has lower heating efficiency for the electrode assembly 11.

[0192] When a support plate 15 is provided in the battery cell 100, an air gap exists between the support plate 15 and the bottom of the housing 122, and an air gap also exists between the support plate 15 and the electrode assembly 11. Therefore, when heat is conducted downward, the heat from the bottom of the housing 122 is conducted to the air gap between the support plate 15 and the housing 122, then to the support plate 15, and then to the air gap between the support plate 15 and the housing 122 and the electrode assembly 11, and finally to the electrode assembly 11, thereby heating the electrode assembly 11. This structure, with multiple air gaps along the heating path in the height direction Z, also reduces heating efficiency.

[0193] In addition, when the protective film 16 is provided in the battery cell 100 , there may still be a certain air gap between the protective film 16 and the electrode assembly 11 , which may also affect the conduction of heat to the electrode assembly 11 .

[0194] As can be seen from the structural description of the battery cell 100 described above, when using a baking tray to heat the battery cell 100, the battery cell 100 is supported on the baking tray. Heat is transferred from the baking tray to the side of the battery cell 100 closest to the baking tray, and then gradually flows into the interior of the battery cell 100, heating the electrode assembly 11 until the temperature of the entire electrode assembly 11 reaches the set temperature range, after which the temperature is maintained. However, due to the presence of numerous air gaps within the battery cell 100 along the heat conduction path, and due to the low thermal conductivity of air, typically only 0.026 W / (m·°C), this affects the heat conduction efficiency, resulting in low heating efficiency for the electrode assembly 11.

[0195] Thermal conductivity refers to the amount of heat transferred through an area of ​​1 square meter in one hour under stable heat transfer conditions, when the temperature difference between the two surfaces of a 1-meter-thick material is 1 degree (K, °C). The unit is watts per meter degree (W / (m·K)). Here, K and °C are both temperature units, K refers to Kelvin temperature (also known as thermodynamic temperature), and °C refers to Celsius temperature. Each K is equal to each °C, that is, 1W / (m·K) is equal to 1W / (m·℃). The unit of thermal conductivity can be expressed as W / (m·K) or W / (m·℃). Thermal conductivity can reflect the heat conduction efficiency of a material.

[0196] In some embodiments, an electrode terminal 13 is provided on one side of the battery cell 100 , and one of the tray 210 and the cover plate 220 is in contact with the electrode terminal 13 .

[0197] Since the electrode terminal 13 is connected to the tab 111 of the electrode assembly 11, and the tab 111 is connected to the current collector of the electrode sheet, the electrode terminal 13, the tab 111, and the current collector are all made of materials with high thermal conductivity. For example, in the negative electrode portion of the battery cell 100, the negative current collector, the negative tab, and the negative electrode terminal 13 are mostly made of materials such as copper, which has a thermal conductivity of 385W / (m·°C); in the positive electrode portion, the positive current collector, the positive tab, and the positive electrode terminal 13 are mostly made of materials such as aluminum, which has a thermal conductivity of 236W / (m·°C). In this way, heating the electrode terminal 13 can quickly transfer heat to the tab 111 and then to the current collector, thereby heating the active material layer on the current collector, thereby quickly heating the entire electrode assembly 11 to improve heating efficiency.

[0198] By bringing one of the tray 210 and the cover plate 220 into contact with the electrode terminal 13, the electrode terminal 13 can be heated. Since the tab 111 of the electrode assembly 11 in the battery cell 100 is connected to the electrode terminal 13, the electrode terminal 13 can quickly transfer heat to the tab 111. Through the higher thermal conductivity of the tab 111, the electrode piece of the electrode assembly 11 can be quickly heated, so that the electrode assembly 11 inside the battery cell 100 can be quickly heated through the electrode terminal 13 to improve the heating efficiency.

[0199] In some embodiments, the battery cell 100 has a first surface 101 and a second surface 102 facing each other. The electrode terminals 13 are provided on the first surface 101 . The tray 210 is used to support the second surface 102 . The cover plate 220 is used to cover the first surface 101 .

[0200] The first surface 101 refers to the side of the battery cell 100 where the electrode terminals 13 are located, while the second surface 102 refers to the side of the battery cell 100 opposite the first surface 101. Referring also to Figure 1 , in this embodiment, the side of the end cap 121 of the battery cell 100 that is away from the housing 122 is the first surface 101, while the bottom surface of the housing 122 is the second surface 102. It will be understood that when the electrode terminals 13 of the battery cell 100 are located on other side surfaces of the housing 122, such side surfaces are considered the first surface 101 of the battery cell 100.

[0201] During use, the second side 102 of the battery cell 100 contacts the tray 210, so that the tray 210 supports the second side 102 of the battery cell 100, and thus supports the battery cell 100. The cover plate 220 covers the first side 101 of the battery cell 100. Therefore, the tray 210 heats the battery cell 100 primarily from the second side 102 toward the first side 101, and the cover plate 220 heats the battery cell 100 primarily from the first side 101 toward the second side 102. Electrode terminals 13 are provided on the first side 101. When the cover plate 220 heats the first side 101 of the battery cell 100, it heats the electrode terminals 13 more quickly, thereby quickly transferring heat to the tabs 111 and then to the current collector, thereby heating the active material layer on the current collector. This allows the entire electrode assembly 11 to be quickly heated, improving heating efficiency.

[0202] By covering the cover plate 220 on the first surface 101, the cover plate 220 can heat the electrode terminal 13. Since the tab 111 of the electrode assembly 11 in the battery cell 100 is connected to the electrode terminal 13, the electrode terminal 13 can quickly transfer heat to the tab 111. Through the higher thermal conductivity of the tab 111, the electrode piece of the electrode assembly 11 can be quickly heated, so as to achieve rapid heating of the electrode assembly 11 inside the battery cell 100 through the electrode terminal 13, thereby improving the heating efficiency.

[0203] In some embodiments, for the battery cell 100 , since the electrode terminals 13 on the battery cell 100 are mostly protruding from the first surface 101 , the surface of the cover plate 220 covering the battery cell 100 can be set to be flat to facilitate processing and manufacturing.

[0204] Generally, only the tray 210 is provided to support and heat the battery cells 100. If the heating time of the battery cells 100 is 30-35 minutes (min), the heating time of the battery cells 100 can be reduced to 15-20 minutes by using the tray 210 and the cover plate 220 to heat the battery cells 100.

[0205] In some embodiments, electrode terminals 13 are respectively provided on two opposite sides of the battery cell 100 , and the tray 210 and the cover plate 220 are in contact with the electrode terminals 13 on the two opposite sides of the battery cell 100 .

[0206] The above structure, when heating the battery cell 100 with electrode terminals 13 on two opposite sides, can make the tray 210 and the cover plate 220 heat the electrode terminals 13 on two opposite sides of the battery cell 100 respectively. Since the tabs 111 of the electrode assembly 11 in the battery cell 100 are connected to the electrode terminals 13, the electrode terminals 13 can quickly conduct heat to the tabs 111. Through the higher thermal conductivity of the tabs 111, the pole pieces of the electrode assembly 11 can be quickly heated, so as to achieve rapid heating of the electrode assembly 11 inside the battery cell 100 through the electrode terminals 13, thereby improving the heating efficiency.

[0207] Please refer to FIG. 10 , which is a schematic diagram of the exploded structure of a battery baking jig 200 and a battery cell 100 according to some embodiments of the present application.

[0208] Please also refer to FIG. 1 . In some embodiments, a plurality of receiving grooves 222 are defined on the cover plate 220 . The receiving grooves 222 are used to accommodate the electrode terminals 13 on the battery cells 100 .

[0209] The accommodating groove 222 is a groove structure provided on the cover plate 220. The shape and size of the accommodating groove 222 are adapted to the electrode terminal 13. Therefore, when the cover plate 220 is placed on the battery cell 100, the electrode terminal 13 can be placed in the accommodating groove 222. This allows the cover plate 220 to better contact the electrode terminal 13, increasing the contact area between the cover plate 220 and the electrode terminal 13, thereby increasing the heating area of ​​the cover plate 220 on the electrode terminal 13 and faster heat transfer to the electrode terminal 13.

[0210] The receiving grooves 222 are provided on the cover plate 220 to receive the electrode terminals 13 on the battery cells 100 , thereby increasing the contact area between the cover plate 220 and the electrode terminals 13 , thereby improving the heating efficiency of the cover plate 220 on the electrode terminals 13 .

[0211] In some embodiments, the cover plate 220 contacts at least one side of the battery cell 100 away from the tray 210 .

[0212] By placing the cover plate 220 in contact with the side of the battery cell 100 away from the tray 210 , the contact area between the cover plate 220 and the battery cell 100 can be increased, thereby increasing the heating area of ​​the battery cell 100 by the cover plate 220 , thereby heating the battery cell 100 faster.

[0213] The cover plate 220 is in contact with the side of the battery cell 100 away from the tray 210 so that the cover plate 220 can quickly heat the side of the battery cell 100 away from the tray 210 to improve heating efficiency.

[0214] For example, in some embodiments, the cover plate 220 covers the side of the battery cell 100 where the electrode terminal 13 is provided. A groove structure can be provided on the cover plate 220 to allow the electrode terminal 13 to be placed therein, so that the cover plate 220 contacts the side of the battery cell 100 away from the tray 210, thereby improving the heating efficiency of the battery cell 100 by the cover plate 220.

[0215] For example, in some embodiments, the cover plate 220 covers the side of the battery cell 100 where no electrode terminal 13 is provided. The cover plate 220 can be directly in contact with the corresponding side of the battery cell 100 to heat the side of the battery cell 100 where the electrode terminal 13 is provided.

[0216] In some embodiments, the cover plate 220 covers the side of the battery cell 100 where the electrode terminal 13 is provided, and the receiving groove 222 on the cover plate 220 is adapted to the electrode terminal 13, so that the bottom surface of the receiving groove 222 can be in contact with the electrode terminal 13, and the cover plate 220 is also in contact with the side of the battery cell 100 away from the tray 210, so that the side of the battery cell 100 away from the tray 210 and the electrode terminal 13 can be heated at the same time to improve the heating efficiency of the battery cell 100.

[0217] In some embodiments, the cover plate 220 is provided with an adapting surface 22 adapted to be in contact with a surface of the battery cell 100 away from the tray 210 .

[0218] The adapting surface 22 is a surface that can adapt to a predetermined surface to achieve a greater degree of contact with the predetermined surface. In this embodiment, the adapting surface 22 refers to the surface of the cover plate 220 that faces away from the tray 210 and the components on that surface that are in good contact with each other. For example, a receiving groove 222 is provided on the cover plate 220 to accommodate the electrode terminal 13, and the peripheral area of ​​the receiving groove 222 is adapted to contact the surface of the end cap 121 of the battery cell 100. Thus, the groove wall surface and the peripheral area of ​​the receiving groove 222 together form the adapting surface 22.

[0219] The groove wall surface of the accommodating groove 222 refers to the bottom surface of the accommodating groove 222 and the side surface of the accommodating groove 222 .

[0220] An adapting surface 22 is provided on the cover plate 220 to better contact the side of the battery cell 100 away from the tray 210, thereby increasing the contact area between the cover plate 220 and the battery cell 100, so that the heat on the cover plate 220 can be transferred to the battery cell 100 more quickly, thereby improving the heating efficiency of the cover plate 220 on the battery cell 100.

[0221] Generally, only the tray 210 is provided to support and heat the battery cells 100. If the heating time of the battery cells 100 is 30-35 minutes (min), then using the tray 210 and the cover plate 220 to heat the battery cells 100, and providing the adapting surface 22 on the cover plate 220, the heating time of the battery cells 100 can be reduced to 10-15 minutes.

[0222] Please refer to FIG. 11 , which is a schematic diagram of the exploded structure of a battery baking jig 200 and a battery cell 100 according to some embodiments of the present application.

[0223] Please also refer to FIG. 1 . In some embodiments, a second positioning groove 221 is defined on the cover plate 220 . The second positioning groove 221 is used to position the end of the battery cell 100 away from the tray 210 .

[0224] The second positioning groove 221 refers to a groove structure provided on the cover plate 220, and the size and shape of the second positioning groove 221 are adapted to the shape of the side of the battery cell 100 close to the cover plate 220. In this way, when installing the battery cell 100, the side of the battery cell 100 away from the tray 210 can be placed in the second positioning groove 221, and the end of the battery cell 100 away from the tray 210 is positioned by the second positioning groove 221 to stably support the battery cell 100 and facilitate the cover plate 220 to heat the battery cell 100.

[0225] The cover plate 220 is provided with a second positioning groove 221 to cooperate with the tray 210 to stably support the battery cell 100 and heat the battery cell 100 .

[0226] In some embodiments, a receiving groove 222 can be provided at the bottom of the second positioning groove 221, so that the bottom surface of the second positioning groove 221 and the groove wall surface of the receiving groove 222 can together form the adapting surface 22. The groove wall surface of the receiving groove 222 refers to the bottom surface of the receiving groove 222 and the side surface of the receiving groove 222. This structure can better heat the battery cell 100 and improve heating efficiency.

[0227] In some embodiments, the depth range of the second positioning groove 221 can be 0-20 mm, such as the depth of the second positioning groove 221 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc., so as to position the battery cell 100.

[0228] Please refer to FIG. 12 , which is a schematic diagram of the exploded structure of a battery baking jig 200 and a battery cell 100 according to some embodiments of the present application.

[0229] Please refer to Figure 1. In some embodiments, the battery cell 100 has a first surface 101 and a second surface 102 opposite to each other, and the first surface 101 is provided with an electrode terminal 13; the tray 210 is provided with a contoured surface 21 that adapts and contacts the first surface 101, and the cover 220 covers the second surface 102.

[0230] The first surface 101 refers to the side of the battery cell 100 where the electrode terminals 13 are located, while the second surface 102 refers to the side of the battery cell 100 opposite the first surface 101. Referring also to Figure 1 , in this embodiment, the side of the end cap 121 of the battery cell 100 that is away from the housing 122 is the first surface 101, while the bottom surface of the housing 122 is the second surface 102. It will be understood that when the electrode terminals 13 of the battery cell 100 are located on other side surfaces of the housing 122, such side surfaces are considered the first surface 101 of the battery cell 100.

[0231] The contoured surface 21 refers to a surface that can be adapted to the set surface to achieve a greater degree of fit with the set surface; for example, in this embodiment, the contoured surface 21 refers to a surface on the tray 210 that fits well with the first surface 101 of the battery cell 100 and the components on the first surface 101.

[0232] A contoured surface 21 is provided on the tray 210 to support the first surface 101 of the battery cell 100, so that the tray 210 can quickly heat the first surface 101 of the battery cell 100 and the electrode terminal 13 on the first surface 101. Not only can the side of the battery cell 100 where the first surface 101 is located be quickly heated, but also, since the tab 111 of the electrode assembly 11 in the battery cell 100 is connected to the electrode terminal 13, and the thermal conductivity of the tab 111 and the electrode terminal 13 is relatively high, the electrode piece of the electrode assembly 11 can be quickly heated to improve the heating efficiency.

[0233] In some embodiments, a first positioning groove 211 can be provided on the tray 210, and a groove 212 can be provided at the bottom of the first positioning groove 211. The shape and size of the groove 212 are adapted to match the electrode terminal 13. The first positioning groove 211 is used to receive the end of the battery cell 100 where the first surface 101 is located. The first positioning groove 211 is adapted to fit with the first surface 101, and the groove wall of the groove 212 contacts and fits with the electrode terminal 13, so that the bottom surface of the first positioning groove 211 and the groove wall of the groove 212 together form a contoured surface 21.

[0234] In some embodiments, when the electrode terminal 13 is provided on the end cap 121 of the battery cell 100 and the contoured surface 21 is provided on the tray 210, the battery cell 100 can be mounted upside down on the tray 210, that is, the end cap 121 is placed on the tray 210, and the cover plate 220 is covered on the bottom surface of the battery cell 100 to heat the battery cell 100.

[0235] In some embodiments, please refer to Figures 11 and 12 together. When electrode terminals 13 are respectively provided on two opposite sides of the battery cell 100, a contoured surface 21 can be provided on the tray 210 and an adaptable surface 22 can be provided on the cover plate 220, so that the tray 210 and the cover plate 220 are respectively in contact with and heated by the electrode terminals 13 on the opposite sides of the battery cell 100 to improve heating efficiency.

[0236] According to some embodiments of the present application, the present application provides a battery baking jig 200, including a tray 210 made of a heating plate 20, the tray 210 is used to support the battery cell 100 and heat the battery cell 100; the side of the tray 210 used to support the battery cell 100 is divided into multiple sub-areas 2101, each sub-area 2101 is used to support the battery cell 100, and the area ratio of each sub-area 2101 relative to the tray 210 is equal; the heating plate 20 includes a heat source plate 202 and a heat conducting plate 201 for conducting heat from the heat source plate 202 to the battery cell 100, and the heat conducting plate 201 is provided with a sub-area 2101; the heat source plate 202 is spliced ​​with multiple sub-blocks 2020.

[0237] By dividing the side of the tray 210 used to support the battery cells 100 into multiple sub-areas 2101, with each sub-area 2101 occupying an equal area of ​​the tray 210, the heating power of each sub-area 2101 is similar during heating. This allows for more consistent heating of the battery cells 100 in each sub-area 2101, thereby improving the efficiency of baking and heating the battery cells 100. By splicing together multiple sub-blocks 2020 to form the heat source plate 202, each sub-block 2020 can be heated separately to better control the heating of the battery cells 100 in the corresponding area of ​​each sub-block 2020. This allows for more consistent heating of the battery cells 100 on the tray 210, thereby improving the efficiency of baking and heating the battery cells 100.

[0238] According to some embodiments of the present application, the present application further provides a battery baking device 1000 , comprising the battery baking jig 200 described in any of the above solutions.

[0239] In some embodiments, the battery baking device 1000 further includes a baking oven 300, in which the battery baking jig 200 can be placed, so that the battery cells 100 on the battery baking jig 200 can be baked in the baking oven 300. Furthermore, providing the baking oven 300 to bake the battery baking jig 200 and the battery cells 100 can also provide a more stable baking environment, thereby improving the heating efficiency of the battery cells 100. It also facilitates the extraction of ambient air during the heat preservation phase, thereby improving the efficiency of removing moisture from the battery cells 100.

[0240] According to some embodiments of the present application, the present application further provides a battery production equipment, including the battery baking jig 200 described in any of the above solutions; or, including the battery baking device 1000 described in any of the above solutions.

[0241] Please refer to FIG. 4 and FIG. 6 to FIG. 8 again. According to some embodiments of the present application, the present application provides a method for manufacturing a heating plate, comprising the following steps:

[0242] Providing a first heat conducting plate and a whole heat source plate adapted to the first heat conducting plate, and attaching the whole heat source plate to the first heat conducting plate;

[0243] The entire heat source plate is attached to the first heat conducting plate to form a simulated heating plate 20 structure, facilitating the simulation of heating the battery cell 100. The structure of the first heat conducting plate needs to be the same as that of the heat conducting plate 201 of the heating plate 20 to be made.

[0244] heating the first heat conducting plate with the entire heat source plate attached thereto to obtain temperature data at various locations on the surface of the first heat conducting plate for supporting the battery cells;

[0245] The first heat conducting plate with the whole heat source plate attached thereto is heated to simulate the temperature rising process of the first heat conducting plate during operation.

[0246] Divide the surface into multiple sub-regions based on the surface temperature data;

[0247] Based on the obtained temperature data, the uniformity of the temperature distribution when the first heat conducting plate is heated can be determined. In this way, the temperature of the surface of the first heat conducting plate is divided into regions, which can better determine the shape and size of each sub-region and the separation position between adjacent sub-regions.

[0248] According to the shape of each sub-region, corresponding sub-blocks 2020 of the heat source plate are made respectively;

[0249] Splicing the manufactured sub-blocks 2020 to form a spliced ​​heat source plate 202 adapted to the first heat conducting plate;

[0250] Small heat source plates are provided corresponding to the shapes of the sub-regions. These small heat source plates can be referred to as sub-blocks 2020. Multiple sub-blocks 2020 corresponding to the sub-regions are then spliced ​​together to form a combined heat source plate 202. This allows for individual control of the power and temperature of each sub-block 2020, thereby ensuring more uniform heating of the battery cells 100 in the corresponding regions of each sub-block 2020. The combined heat source plate 202 is the heat source plate 202 used in the heating plate 20 of the battery baking jig 200.

[0251] A second heat conducting plate is provided, and the combined heat source plate 202 is attached to the second heat conducting plate to obtain the heating plate 20. The structure of the second heat conducting plate needs to be the same as that of the heat conducting plate 201 used to make the heating plate 20.

[0252] Through the above method, the heat source plate 202 is spliced ​​with multiple sub-blocks 2020, and the heating of each sub-block 2020 can be controlled separately. Therefore, during the heating process of the battery cell 100, the battery cell 100 in the corresponding area of ​​each sub-block 2020 can be heated in a targeted manner, so that the heating consistency of the battery cell 100 is better, thereby improving the baking and heating efficiency of the battery cell 100.

[0253] The first heat conducting plate and the second heat conducting plate have the same structure and are both heat conducting plates 201 for manufacturing the heating plate 20. In the heating plate manufacturing method of the embodiment of the present application, the first heat conducting plate and the second heat conducting plate are used only to facilitate the distinction between the heat conducting plates 201 in different steps.

[0254] In some embodiments, dividing the surface into a plurality of sub-regions based on temperature data of the surface includes:

[0255] According to the temperature data of the surface, the temperature difference data of the surface and the average temperature of the surface are obtained. According to the temperature difference data and the average temperature, and by setting a temperature gradient, the surface is divided into a plurality of sub-regions.

[0256] Through the above method, the shape of each sub-region can be better set, and then the sub-block 2020 of the corresponding shape can be made, so as to better control the power and temperature of each sub-block 2020 during use, so as to make the temperature rise of the battery cell 100 more consistent, thereby improving the baking and heating efficiency of the battery cell 100.

[0257] In some embodiments, dividing the surface into a plurality of sub-regions based on temperature data of the surface includes:

[0258] According to the surface temperature data, the surface temperature difference data is obtained, and according to the temperature data when the surface temperature difference is the largest, the surface is divided into multiple sub-regions.

[0259] The moment when the surface temperature difference of the first heat conducting plate is the largest indicates that the heating of each part of the surface of the first heat conducting plate is the most uneven at this moment. Thus, at this time, by dividing the surface of the first heat conducting plate according to the temperature, it is possible to better determine the shape and size of each sub-region and the separation position between adjacent sub-regions according to the temperature gradient.

[0260] In some embodiments, dividing the surface into multiple sub-regions according to the temperature data of the surface includes:

[0261] Based on the average temperature of the surface being P, the maximum temperature of the surface being F1, the minimum temperature of the surface being F2, setting the temperature range as T, and setting the temperature gradient as 2T, dividing the entire surface of the first heat conducting plate into N sub-regions with the temperature range of P + 2KT ± T, where N is an odd number and K is an integer; and, P = (F1 + F2) / 2,

[0262] P + 2│K│T < F1 < P + 2│K│T + T, │K│ being the absolute value of K, (F1 - P) / T ≤ N < (F1 - P) / T + 2.

[0263] According to the above temperature range and temperature gradient, divide the shape of each sub-region, and respectively manufacture corresponding sub-blocks 2020 of the heat source plate 202 according to the shape of each sub-region. Then, splice the manufactured sub-blocks 2020 to form a spliced heat source plate 202 adapted to the first heat conducting plate. This spliced heat source plate 202 can respectively control the heating temperature of each sub-block 2020. When applied to the heating plate 20, the spliced heat source plate 202 can be adhered to the first heat conducting plate to heat the first heat conducting plate, and further heat the battery cell 100 on the first heat conducting plate. The above temperature range of P + 2KT ± T refers to the temperature range from P + 2KT - T to P + 2KT + T.

[0264] For example, when the above temperature gradient 2T = 2°C; K = 0, the temperature range area of P + 2KT ± T = P ± 1°C corresponds to the first sub-region; when K = 1, the temperature range area of P + 2KT ± T = P + 2°C ± 1°C corresponds to the second sub-region; when K = -1, the temperature range area of P + 2KT ± T = P - 2°C ± 1°C corresponds to the third sub-region; when K = 2, the temperature range area of P + 2KT ± T = P + 4°C ± 1°C corresponds to the fourth sub-region; when K = -2, the temperature range area of P + 2KT ± T = P - 4°C ± 1°C corresponds to the fifth sub-region, until the Nth sub-region is divided.

[0265] Of course, if the temperature gradient mentioned above is 2T=1℃; when K=0, the temperature range area of ​​P+2KT±T=P±1℃ corresponds to the first sub-area; when K=1, the temperature range area of ​​P+2KT±T=P+1℃±0.5℃ corresponds to the second sub-area; when K=-1, the temperature range area of ​​P+2KT±T=P-1℃±0.5℃ corresponds to the third sub-area; when K=2, the temperature range area of ​​P+2KT±T=P+2℃±0.5℃ corresponds to the fourth sub-area; when K=-2, the temperature range area of ​​P+2KT±T=P-2℃±0.5℃ corresponds to the fifth sub-area, until it is divided into the Nth sub-area.

[0266] Through the above method, the shape of each sub-region can be better set, and then the sub-block 2020 of the corresponding shape can be made, so as to better control the power and temperature of each sub-block 2020 during use, so as to make the temperature rise of the battery cell 100 more consistent, thereby improving the baking and heating efficiency of the battery cell 100.

[0267] In some embodiments, before obtaining the heating plate 20, the steps are further included:

[0268] According to the temperature data of the entire surface, a temperature collection point is set on each sub-block 2020 corresponding to the average temperature of the sub-region.

[0269] During use, the temperature of each sub-block 2020 can be easily collected, so that during the heating process, the heating power of each sub-block 2020 can be adjusted according to the temperature difference of different sub-blocks 2020, thereby making the heating consistency of multiple battery cells 100 better and improving the heating efficiency of the battery cells 100.

[0270] Setting a temperature collection point on each sub-block 2020 can facilitate the collection of the temperature on each sub-block 2020, so that during the heating process, the heating power of each sub-block 2020 can be adjusted according to the temperature difference of different sub-blocks 2020, thereby making the heating consistency of multiple battery cells 100 better and improving the heating efficiency of the battery cells 100.

[0271] In some embodiments, the temperature collection point is provided with a temperature sensor.

[0272] A temperature sensor is provided at the temperature collection point to facilitate detection of the average temperature of each sub-block 2020 , thereby facilitating control of the heating power and temperature of each sub-block 2020 .

[0273] In some embodiments, the temperature of the temperature collection point of each sub-block 2020 may also be detected by an external temperature sensor during use.

[0274] During use, the temperature collected at the average temperature of the sub-block 2020 corresponding to the temperature range of P+2KT±T ​​when K=0 can be used as the reference temperature. If the temperature of some other temperature collection points in the sub-block 2020 is higher than the reference temperature, the power of the sub-block 2020 is reduced; if the temperature of some other temperature collection points in the sub-block 2020 is lower than the reference temperature, the power of the sub-block 2020 is increased.

[0275] In some embodiments, when the heat source plate 202 is assembled using multiple sub-blocks 2020, each sub-block 2020 can be made using a heating wire 2022 disposed in a thermally conductive adhesive layer 2021. In other words, the sub-block 2020 includes a thermally conductive adhesive layer 2021 and heating wires 2022 evenly distributed in the thermally conductive adhesive layer 2021.

[0276] The heating wire 2022 is placed in the thermally conductive adhesive layer 2021, which protects the heating wire 2022. The use of the heating wire 2022 is convenient for processing and manufacturing, and also facilitates controlling the heat generated by the heating wire 2022. Furthermore, the sub-block 2020 of the heat source plate 202 has good deformability, allowing it to better fit with the second heat conducting plate, facilitating heat transfer to the second heat conducting plate.

[0277] In some embodiments, the thickness of the heat conducting plate 201 ranges from 10 mm to 20 mm. For example, the thickness of the heat conducting plate 201 may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0278] Since heat will be dispersed when it is transmitted in the heat conducting plate 201, using a heat conducting plate 201 with a thickness of 10mm-20mm can not only make the thickness of the heat conducting plate 201 smaller, reduce the material and weight of the heat conducting plate 201, and reduce costs, but also make the temperature on the heat source plate 202 more uniform. Therefore, when heating the battery cell 100, the heating power of each sub-region 2101 can be made more uniform, so that the temperature rise of the battery cell 100 is more consistent, thereby improving the baking and heating efficiency of the battery cell 100.

[0279] In some embodiments, before obtaining the heating plate 20, the steps are further included:

[0280] A support plate 203 is provided, and the split heat source plate 202 is attached to the support plate 203 , with the support plate 203 being located on a side of the split heat source plate 202 facing away from the second heat conducting plate.

[0281] The support plate 203 is provided so that the support plate 203 cooperates with the second heat conducting plate to clamp the split heat source plate 202 , thereby protecting the split heat source plate 202 .

[0282] In some embodiments, the support plate 203 may be made of a heat-insulating material to provide heat preservation, reduce heat loss, and improve heat utilization, thereby better heating the battery cell 100 .

[0283] In some embodiments, the support plate 203 can be a plate with a thickness of 1mm-3mm, such as a support plate 203 with a thickness of 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, etc., so that the support plate 203 has a certain structural strength to support the heat source plate 202, and the thickness of the support plate 203 can be smaller to reduce the material and weight of the support plate 203 and reduce costs.

[0284] In some embodiments, before obtaining the heating plate 20, the steps are further included:

[0285] A reflective plate 204 is provided and disposed on a side of the combined heat source plate 202 facing away from the second heat conducting plate.

[0286] The reflective plate 204 is provided to reflect the heat radiation generated by the combined heat source plate 202 toward the second heat conducting plate, thereby improving the utilization rate of heat.

[0287] In some embodiments, the reflective plate 204 can be made of a plate with a thickness of 0.5mm-2mm, such as a reflective plate 204 with a thickness of 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc., so that the reflective plate 204 has a certain thickness and strength to be arranged on the side of the heat source plate 202 away from the second heat conduction plate, and the thickness of the reflective plate 204 can be made smaller to reduce the material and weight of the reflective plate 204 and reduce costs.

[0288] In some embodiments, when the heating plate 20 includes a reflective plate 204 and a support plate 203, the reflective plate 204 is arranged on the side of the support plate 203 away from the heat source plate 202, so that the reflective plate 204 can reflect the heat dissipated from the support plate 203 in the direction away from the second heat conducting plate, thereby improving the utilization rate of heat.

[0289] In some embodiments, before heating the first heat conducting plate with the entire heat source plate attached thereto, the method further comprises:

[0290] The battery cells 100 are placed on the first heat conducting plate.

[0291] The battery cell 100 is arranged on the first heat conducting plate, so that when the temperature is raised by baking, the first heat conducting plate with the heat source plate 202 can better simulate the actual heating of the battery cell 100, thereby making the division of each sub-area more accurate, and thus when each sub-block 2020 is heated in a targeted manner, the temperature rise of the battery cell 100 can be more consistent, thereby improving the heating efficiency of the battery cell 100.

[0292] In some embodiments, the step of heating the first heat conducting plate to which the entire heat source plate is attached comprises:

[0293] The first heat conducting plate with the whole heat source plate attached thereto is placed in a baking oven 300 for heating.

[0294] Heating in the baking oven 300 can better simulate the use environment of the heating plate, and further simulate the heating environment of the battery cell 100 .

[0295] In some embodiments, when the first heat conducting plate is heated, the temperature of the surface of the first heat conducting plate used to support the battery cell 100 can be detected, and the temperature data at various locations on the surface can be recorded; so as to obtain the temperature data of various locations on the surface of the first heat conducting plate used to support the battery cell 100 during the heating process for subsequent use.

[0296] The heating plate 20 manufactured by the manufacturing method of the heating plate 20 of the embodiment of the present application can be applied to the battery baking fixture 200 of the embodiment of the present application. The heating plate 20 in the battery baking fixture 200 of the embodiment of the present application can also be manufactured using the heating plate 20 of the embodiment of the present application.

[0297] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery baking jig, characterized in that: A tray having a heating plate is included, wherein the tray is used to support a battery cell and heat the battery cell; A side of the tray used for supporting the battery cell is divided into a plurality of sub-areas, each of which is used for supporting the battery cell, and each of which has an equal area ratio relative to the tray.

2. The battery baking jig according to claim 1, characterized in that: The plurality of sub-areas are arranged in a rectangular array.

3. The battery baking jig according to claim 1 or 2, characterized in that: A first positioning groove is provided on each of the sub-regions, and the first positioning groove is used for positioning the battery monomer.

4. The battery baking jig according to any one of claims 1 to 3, characterized in that: The heating plate comprises a heat source plate and a heat conducting plate attached to one side of the heat source plate, and the sub-region is arranged on a side of the heat conducting plate facing away from the heat source plate.

5. The battery baking jig according to claim 4, characterized in that: The heat source plate is divided into a plurality of sub-blocks, and a plurality of the sub-blocks are spliced ​​and connected.

6. The battery baking jig according to claim 4 or 5, characterized in that: The heat source plate comprises a heat conductive adhesive layer and heating wires uniformly distributed in the heat conductive adhesive layer.

7. The battery baking jig according to any one of claims 4 to 6, characterized in that: The heating plate further comprises a support plate, the heat source plate is supported on the support plate, and the support plate is located at a side of the heat source plate away from the heat conducting plate.

8. The battery baking jig according to any one of claims 4 to 7, characterized in that: The heating plate further comprises a reflective plate, and the reflective plate is arranged on a side of the heat source plate away from the heat conducting plate.

9. The battery baking jig according to any one of claims 4 to 8, characterized in that: The length of the heat source plate is equal to the length of the heat conducting plate, and the width of the heat source plate is equal to the width of the heat conducting plate.

10. The battery baking jig according to any one of claims 1 to 9, characterized in that: The invention also comprises a cover plate with a heating plate, wherein the cover plate is used to cover a side of the battery cell away from the tray and heat the battery cell.

11. The battery baking jig according to claim 10, characterized in that: An electrode terminal is provided on one side of the battery cell, and one of the tray and the cover plate is in contact with the electrode terminal; Alternatively, two opposite surfaces of the battery cell are provided with electrode terminals respectively, and the tray and the cover plate are in contact with the electrode terminals on the two opposite surfaces of the battery cell respectively.

12. A battery baking device, characterized in that: A battery baking jig as claimed in any one of claims 1 to 11.

13. A battery production device, characterized in that: It comprises the battery baking jig as described in any one of claims 1 to 11; or, it comprises the battery baking device as described in claim 12.

14. A method for manufacturing a heating plate, characterized in that: The steps include: Providing a first heat conducting plate and a whole heat source plate adapted to the first heat conducting plate, and attaching the whole heat source plate to the first heat conducting plate; heating the first heat conducting plate to which the whole heat source plate is attached, so as to obtain temperature data of various locations on the surface of the first heat conducting plate for supporting the battery cells; dividing the surface into a plurality of sub-regions according to the temperature data of the surface; According to the shapes of the sub-regions, corresponding sub-blocks of the heat source plate are respectively manufactured; Splicing the manufactured sub-blocks to form a spliced ​​heat source plate adapted to the first heat conducting plate; A second heat conducting plate is provided, and the combined heat source plate is attached to the second heat conducting plate to obtain a heating plate.

15. The method for manufacturing a heating plate according to claim 14, characterized in that: Dividing the surface into a plurality of sub-regions according to the temperature data of the surface comprises: According to the temperature data of the surface, the temperature difference data of the surface and the average temperature of the surface are obtained. According to the temperature difference data and the average temperature, and by setting the temperature gradient, the surface is divided into a plurality of sub-areas.

16. The method for manufacturing a heating plate according to claim 14 or 15, characterized in that: Dividing the surface into a plurality of sub-regions according to the temperature data of the surface comprises: According to the temperature data of the surface, the temperature difference data of the surface is obtained, and according to the temperature when the temperature difference of the surface is the largest data, dividing the surface into a plurality of sub-regions.

17. The method for manufacturing a heating plate according to any one of claims 14 to 16, characterized in that: Before obtaining the heating plate, the method further comprises the following steps: According to the temperature data of the entire surface, a temperature collection point is set at a location corresponding to the average temperature of the sub-region on each of the sub-blocks.

18. The method for manufacturing a heating plate according to claim 17, characterized in that: The temperature collection point is provided with a temperature sensor.

19. The method for manufacturing a heating plate according to any one of claims 14 to 18, characterized in that: The sub-block includes a heat-conducting adhesive layer and heating wires uniformly distributed in the heat-conducting adhesive layer.

20. The method for manufacturing a heating plate according to any one of claims 14 to 19, characterized in that: Before obtaining the heating plate, the method further comprises the following steps: A support plate is provided, the combined heat source plate is attached to the support plate, and the support plate is located at a side of the combined heat source plate away from the second heat conducting plate.

21. The method for manufacturing a heating plate according to any one of claims 14 to 20, characterized in that: Before obtaining the heating plate, the method further comprises the following steps: A reflective plate is provided, and the reflective plate is arranged on a side of the combined heat source plate facing away from the second heat conducting plate.

22. The method for manufacturing a heating plate according to any one of claims 14 to 21, characterized in that: Before heating the first heat conducting plate to which the whole heat source plate is attached, the method further comprises: The battery cells are placed on the first heat conducting plate.

23. The method for manufacturing a heating plate according to any one of claims 14 to 22, characterized in that: The step of heating the first heat conducting plate to which the whole heat source plate is attached comprises: The first heat conducting plate with the whole heat source plate attached thereto is placed in a baking oven for heating.

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