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

Abstract

The invention provides a battery baking jig and device, battery production equipment and a heating plate manufacturing method. The battery baking jig comprises a tray with a heating plate, and the tray is used for supporting the battery monomers and heating the battery monomers; one surface of the tray for supporting the single batteries is divided into a plurality of sub-regions, each sub-region is used for supporting the single batteries, and the area ratios of the sub-regions relative to the tray are equal. The surface, used for supporting the battery monomers, of the tray is divided into a plurality of sub-regions, and the area ratio of each sub-region to the tray is equal, so that the heating power of each sub-region is similar during heating, the temperature rise consistency of the battery monomers in each sub-region can be better, and the baking and heating efficiency of the battery monomers is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery production equipment, and more specifically, to a battery baking jig, a battery baking device, a battery production equipment and a heat source plate segmentation method. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the production process of battery cells, before adding electrolyte to the battery cells, the battery cells need to be baked to remove moisture from the electrode assembly. Currently, the battery cells are generally supported on a tray and then placed in a baking oven for heating and baking to remove moisture. However, when heating the battery cells, due to the installation density of the battery cells, the power of the tray to heat different battery cells is different, resulting in poor consistency in the heating of the battery cells and slow heating efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a battery baking jig, a battery baking device and a battery production equipment to solve the problem in the related art that the heating consistency of the battery monomer baking is poor, resulting in slow heating efficiency.

[0005] In a first aspect, an embodiment of the present application provides a battery baking jig, comprising a tray with a heating plate, the tray being used to support a battery cell and heat the battery cell;

[0006] A side of the tray used for supporting the battery cell is divided into a plurality of sub-areas, each sub-area is used for supporting the battery cell, and the area ratio of each sub-area relative to the tray is equal.

[0007] In the technical solution of the embodiment of the present application, a side of the tray used to support the battery cells is divided into multiple sub-areas, and each sub-area occupies an equal ratio of the tray area. When heating, the heating power of each sub-area is similar, 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.

[0008] In some embodiments, the plurality of sub-regions are arranged in a rectangular array.

[0009] A plurality of sub-region rectangular arrays are arranged to facilitate sub-region division.

[0010] 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.

[0011] A first positioning groove is provided in the sub-region so as to position the battery cell when supporting the battery cell, so as to stably support the battery cell and heat the battery cell.

[0012] 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.

[0013] A heat source plate is provided to generate heat to heat the battery cell; and a heat conducting plate is provided to better conduct the heat generated by the heat source plate to the battery cell, and 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, so that when heating multiple battery cells, the heating efficiency of the multiple battery cells can be made more consistent, so as to improve the heating efficiency of the multiple battery cells.

[0014] In some embodiments, the heat source plate is divided into a plurality of sub-blocks, and the plurality of sub-blocks are spliced ​​and connected.

[0015] 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 make the temperature rise of the battery cells on the tray more consistent and improve the efficiency of baking and heating the battery cells.

[0016] In some embodiments, the heat source plate includes a thermally conductive adhesive layer and heating wires uniformly distributed in the thermally conductive adhesive layer.

[0017] The heating wire is placed in the thermal conductive adhesive layer, and the thermal conductive adhesive layer is used to protect the heating wire. The use of the heating wire is convenient for processing and manufacturing, and it is also convenient to control the heating of the heating wire. In addition, the heat source plate can have good deformation ability and can better fit with the thermal conductive plate so that heat is transferred to the thermal conductive plate.

[0018] In some embodiments, the thickness of the thermally conductive plate ranges from 10 mm to 20 mm.

[0019] By using a heat conductive plate with a thickness of 10mm-20mm, the heat from the heat source plate can be more dispersed during the process of transferring the heat to the battery cell, so that the temperature on the heat source plate is more uniform. 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.

[0020] 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.

[0021] A support plate is arranged so that the support plate cooperates with the heat conducting plate to clamp the heat source plate, thereby protecting the heat source plate.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 as to make the temperature rise of the battery cell more consistent, thereby improving the efficiency of baking and heating the battery cell.

[0026] 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.

[0027] A cover plate is arranged on the battery cell to position and support the battery cell through the cooperation of 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 the battery cell, thereby improving the efficiency of baking and heating the battery cell.

[0028] 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;

[0029] Alternatively, electrode terminals are respectively disposed on two opposite sides of the battery cell, and the tray and the cover plate are in contact with the electrode terminals on the two opposite sides of the battery cell, respectively.

[0030] Through the above structure, the electrode terminal can be heated. Since the electrode tabs of the electrode assembly in the battery cell are connected to the electrode terminals, the electrode terminals can quickly transfer 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.

[0031] In a second aspect, an embodiment of the present application provides a battery baking device, including the battery baking jig as described in the above embodiment.

[0032] In a third aspect, an embodiment of the present application provides a battery production equipment, including the battery baking jig as described in the above embodiment; or, including the battery baking device as described in the above embodiment.

[0033] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a heating plate, comprising the following steps:

[0034] Providing a first heat conducting plate and a whole heat source plate matched with the first heat conducting plate, and attaching the whole heat source plate to the first heat conducting plate;

[0035] The first heat conducting plate with the whole heat source plate attached thereto is heated to obtain temperature data of various locations on the surface of the first heat conducting plate for supporting the battery cells;

[0036] Dividing the surface into a plurality of sub-regions according to the temperature data of the surface;

[0037] According to the shapes of each sub-region, corresponding sub-blocks of the heat source plate are respectively manufactured;

[0038] Splicing the manufactured sub-blocks to form a spliced ​​heat source plate adapted to the first heat conducting plate;

[0039] 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.

[0040] 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 cell, the battery cells in the corresponding areas of each sub-block can be heated in a targeted manner to make the heating consistency of the battery cell better, thereby improving the efficiency of baking and heating the battery cell.

[0041] In some embodiments, dividing the surface into a plurality of sub-regions based on the temperature data of the surface includes:

[0042] 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.

[0043] 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.

[0044] In some embodiments, dividing the surface into a plurality of sub-regions based on the temperature data of the surface includes:

[0045] The surface temperature difference data is obtained based on the surface temperature data, and the surface is divided into a plurality of sub-areas based on the temperature data when the surface temperature difference is the largest.

[0046] The surface is divided into regions according to the temperature data when the temperature difference is the largest, and the division of each sub-region is more accurate.

[0047] In some embodiments, before obtaining the heating plate, the method further comprises the steps of:

[0048] 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.

[0049] 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, so as to make the heating consistency of multiple battery cells better and improve the efficiency of battery cell baking and heating.

[0050] In some embodiments, the temperature collection point is provided with a temperature sensor.

[0051] A temperature sensor is set at the temperature collection point 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.

[0052] In some embodiments, the sub-block includes a thermal conductive adhesive layer and heating wires uniformly distributed in the thermal conductive adhesive layer.

[0053] The heating wire is placed in the thermally conductive adhesive layer, and the heating wire is protected by the thermally conductive adhesive layer. The heating wire is easy to process and manufacture, and it is also easy to control the heating of the heating wire. In addition, the sub-block of the heat source plate can have good deformation ability, and can better fit with the second heat conducting plate, so that heat is conducted to the second heat conducting plate.

[0054] In some embodiments, before obtaining the heating plate, the method further comprises the steps of:

[0055] A support plate is provided, and 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.

[0056] A support plate is provided so that the support plate cooperates with the second heat conducting plate to clamp the combined heat source plate, thereby protecting the combined heat source plate.

[0057] In some embodiments, before obtaining the heating plate, the method further comprises the steps of:

[0058] A reflective plate is provided and arranged on a side of the combined heat source plate facing away from the second heat conducting plate.

[0059] A reflective plate is provided to reflect the heat radiation generated by the combined heat source plate toward the second heat conducting plate to improve the utilization rate of heat.

[0060] In some embodiments, before heating the first heat conducting plate with the whole heat source plate attached thereto, the method further comprises:

[0061] The battery cells are placed on the first heat conducting plate.

[0062] 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 more consistent, thereby improving the heating efficiency of the battery cell.

[0063] In some embodiments, the step of heating the first heat conducting plate with the whole heat source plate attached thereto comprises:

[0064] The first heat conducting plate with the whole heat source plate attached thereto is placed in a baking oven for heating.

[0065] Heating in an oven can better simulate the environment in which a hot plate is used.

[0066] 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

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. 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 paying creative work.

[0068] Figure 1 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0069] Figure 2 This is a schematic diagram of the structure of a battery baking device according to some embodiments of the present application;

[0070] Figure 3 This is a schematic diagram of the structure of a battery baking jig supporting a battery cell in some embodiments of the present application;

[0071] Figure 4 for Figure 3 A schematic diagram of the structure of the battery baking fixture and the battery cell being separated;

[0072] Figure 5 This is a schematic diagram of the exploded structure of a heating plate according to some embodiments of the present application;

[0073] Figure 6 This is a schematic diagram of the structure of the heat source plate in some embodiments of the present application;

[0074] Figure 7 Schematic diagram of the exploded structure of the heating plate of some other embodiments of the present application;

[0075] Figure 8 Schematic diagram of the exploded structure of the heating plate of some other embodiments of the present application;

[0076] Fig. 9Schematic diagram of the exploded structure of a battery baking jig according to some other embodiments of the present application;

[0077] Fig.10 A schematic diagram of the exploded structure of a battery baking jig according to some further embodiments of the present application;

[0078] Fig.11 Schematic diagram of the exploded structure of a battery baking jig according to some other embodiments of the present application;

[0079] Fig.12 Schematic diagram of the exploded structure of battery baking jigs according to other embodiments of the present application.

[0080] Among them, the main marks of the drawings in the figure are:

[0081] 1000-battery baking device;

[0082] 100-battery cell; 11-electrode assembly; 111-ear; 12-housing; 121-end cover; 122-housing; 13-electrode terminal; 14-adapter; 15-support plate; 16-protective film; 101-first side; 102-second side;

[0083] 200-battery baking fixture; 20-heating plate; 210-tray; 2101-sub-area; 21-contact surface; 211-first positioning groove; 212-groove; 201-heat conducting plate; 202-heat source plate; 2020-sub-block; 2021-thermal conductive glue; 2022-heating wire; 203-support plate; 204-reflective plate; 220-cover plate; 22-adapting surface; 221-second positioning groove; 222-accommodating groove;

[0084] 300-baking oven;

[0085] X-width direction; Y-thickness direction; Z-height direction. DETAILED DESCRIPTION

[0086] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0088] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0089] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0090] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0091] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces). "Several" means one or more than one, unless otherwise clearly and specifically defined.

[0092] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and 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, and therefore should not be understood as a limitation on the embodiments of the present application.

[0093] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0094] In the description of the embodiments of the present application, unless otherwise clearly specified and 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.

[0095] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "adjacent" refers to being close in position. 1 , A 2 A and B three parts, 1 The distance between B and A is greater than that between A and B. 2 The distance between A and B, then 2 Compared with A 1 For example, A 2 Closer to B, i.e. A 2 adjacent to B, or B adjacent to A 2 For example, when there are multiple C components, the multiple C components are C 1 , C 2 ……C N , when one of the C components, such as C 2 If B is closer to component B than to other C components, then B is adjacent to C. 2 , or we can say C 2 Near B.

[0096] The battery cells in the embodiments of the present application 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 shape of the battery cells includes but is not limited to cylinders, flat bodies, cuboids or other shapes. The battery cells are generally divided into cylindrical battery cells, square battery cells and soft-pack battery cells according to the packaging method, including but not limited to: cylindrical battery cells, square battery cells and soft-pack battery cells.

[0097] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a casing for encapsulating one or more battery cells. The casing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells to a certain extent. 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.

[0098] 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.

[0099] The electrode assembly is also called a battery cell. The electrode assembly generally includes a pole piece and a separator. The pole piece includes a positive pole piece and a negative pole piece. The electrode assembly mainly relies on the movement of metal ions between the positive pole piece and the negative pole piece to work. The pole piece includes a current collector and an active material layer. The active material layer is coated on the surface of the current collector. The part of the current collector that is not coated with the active material layer protrudes from the part that is coated with the active material layer. The part that is not coated with the active material layer serves as a pole ear, or a metal conductor is welded on the current collector and led out to serve as a pole ear. For example, the positive pole piece includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The part of the positive active material layer that is not coated on the positive current collector protrudes from the part that is coated with the positive active material layer. The part that is not coated with the positive active material layer serves as a positive pole ear, or a metal conductor is welded on the positive current collector and led out to serve as a positive pole ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The portion of the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the portion that is coated with the negative electrode active material layer. The portion that is not coated with the negative electrode active material layer serves as a negative electrode tab, or a metal conductor is welded and led out on the negative electrode current collector to serve as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current is passed without melting to a certain extent, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. It can be understood that in the electrode assembly, the number of positive electrode tabs may be one, and the number of negative electrode tabs may also be one. That is, two groups of tabs are provided on the electrode assembly, each group includes at least one tab, and one group of tabs is a positive electrode tab, and the other group of tabs is a negative electrode tab.

[0100] 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 pole ear to the current collector, and then arrange it in the order of positive electrode sheet-diaphragm-negative electrode sheet-diaphragm; and then wind it to form a cylindrical or square battery cell. The laminated structure is mostly to lead the pole ear 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 Z-shaped folding. 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, and allow 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.

[0101] After the electrode assembly is manufactured and installed in the housing, electrolyte needs to be injected so that the electrode assembly is immersed in the electrolyte and can fully absorb the electrolyte. The electrolyte can provide some active ions, which are used as conductive ions during the charging and discharging process; in addition, the electrolyte also provides ion channels, or carriers, so that ions can move freely in it to achieve electrical conduction between the electrodes.

[0102] Since the active material layer is coated on the surface of the current collector and the electrode assembly is formed, the active material layer of the electrode sheet contains a lot of water, which makes it difficult for the electrode assembly to fully absorb the electrolyte after the electrolyte is injected, or it is difficult to control the injection amount of the electrolyte. Therefore, before the battery cell is filled with electrolyte, the battery cell needs to be baked to remove the moisture in the electrode assembly.

[0103] The battery cells are generally placed on a baking tray, supported by the baking tray, and then placed in a baking oven for baking. During the baking process, the battery cells need to be heated up to a set temperature, then kept warm, and the baking oven is evacuated to remove moisture.

[0104] However, during baking and heating, the heat of the baking tray will not only be conducted to the battery cells, but also to the surrounding environment. If the positions of the battery cells on the baking tray are different, or if the placement density of the battery cells is different, the speed at which the heat is dissipated to the surroundings will be different, and the speed at which the heat is conducted to each battery cell will also be different. The power of the tray to heat different battery cells is different, resulting in poor consistency in the heating of the battery cells and slow heating efficiency.

[0105] 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, and setting the ratio of the tray area occupied by each sub-area to be equal. When heating, the heating power of each sub-area is similar, so that the temperature of the battery cells in each sub-area can be more consistent, thereby shortening the heating time of the battery cells and improving the efficiency of the baking and heating of the battery cells.

[0106] The battery baking jig disclosed in the embodiment of the present application can be used in a battery baking device in a battery production process, and can also be used in battery production equipment such as a battery production line and a battery production inspection.

[0107] Please refer to Figure 1 , Figure 1 Schematic diagram of the exploded structure of a battery cell 100 provided in some embodiments of the present application.

[0108] The battery cell 100 includes an electrode assembly 11 and a housing 12 in which the electrode assembly 11 is installed. The housing 12 refers to a shell structure having an inner space in which the electrode assembly 11 is placed to be protected by the housing 12 .

[0109] 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.

[0110] In some embodiments, the housing 12 includes a shell 122 and an end cover 121 , and the end cover 121 is covered on the shell 122 .

[0111] 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 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 and collided, so that the battery cell 100 can have a 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.

[0112] The shell 122 is a component used to cooperate with the end cap 121 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 11, electrolyte and other components. The shell 122 and the end cap 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 cap 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.

[0113] 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, so as to facilitate assembly.

[0114] In some embodiments, the battery cell 100 further includes a support plate 15, which is installed 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 a variety of materials, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0115] 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 through the protective film 16, thereby preventing the electrode assembly 11 from loosening to a certain extent. When the protective film 16 has an insulating property, it can also provide insulating protection for the electrode assembly 11, reducing the risk of short circuit between the electrode assembly 11 and the housing 122.

[0116] In some embodiments, the protective film 16 may be a film such as PET (polyethylene glycol terephthalate), or may be made of PP film, PE film, etc.

[0117] 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 may be provided on a side wall of the outer shell 12. For example, when the outer shell 12 includes a shell 122 and an end cover 121, the electrode terminal 13 may be provided on the end cover 121. Of course, the electrode terminal 13 may also be provided on a side wall of the shell 122. The electrode terminal 13 is electrically connected to the tab 111.

[0118] The electrode terminal 13 refers to a conductive member connected to the tab 111 of the electrode assembly 11 to output the electric energy of the battery cell 100 or charge the battery cell 100. The battery cell 100 generally has two electrode terminals 13, which are respectively connected to the positive tab and 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.

[0119] In some embodiments, see Figure 1 The battery cell 100 further includes two adapters 14, which correspond to the two electrode terminals 13 respectively, and each adapter 14 is connected to the corresponding electrode terminal 13, and each adapter 14 is connected to the corresponding pole lug 111, that is, each pole lug 111 is connected to the corresponding electrode terminal 13 through the adapter 14, so as to facilitate the connection between the pole lug 111 and the electrode terminal 13, and the connection is more stable. For the sake of description, the adapter 14 connected to the positive electrode terminal is called the positive electrode adapter, and the positive pole lug is connected to the positive electrode adapter; the adapter 14 connected to the negative electrode terminal is called the negative electrode adapter, and the negative pole lug is connected to the negative electrode adapter.

[0120] Of course, in some embodiments, the electrode terminal 13 may also be directly connected to the corresponding electrode tab 111 by welding.

[0121] See also Figure 2 Some embodiments of the present application provide a battery baking device 1000, including a baking box 300 and a battery baking jig 200. The battery baking jig 200 is used to support the battery cell 100 and heat the battery cell 100. After the battery cell 100 is installed on the battery baking jig 200, it is placed in the baking box 300 as a whole for heating and baking. In addition, the baking box 300 is provided to bake the battery baking jig 200 and the battery cell 100, which can also provide a more stable baking environment to improve the heating efficiency of the battery cell 100, and is also conducive to extracting ambient air during the heat preservation stage to improve the efficiency of removing moisture from the battery cell 100.

[0122] See also Figures 3 to 6 , Figure 3 This is a schematic structural diagram of a battery baking jig 200 supporting a battery cell 100 according to some embodiments of the present application. Figure 4It is a schematic structural diagram of the battery baking jig 200 and the battery cell 100 separated in some embodiments of the present application. Figure 5 It is a schematic diagram of the exploded structure of the heating plate 20 according to some embodiments of the present application. Figure 6 Schematic diagram of the structure of the heat source plate 202 according to some embodiments of the present application.

[0123] Some embodiments of the present application provide a battery baking jig 200, including a tray 210 with a heating plate 20, the tray 210 is used to support a battery cell 100 and heat the battery cell 100; a 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.

[0124] The heating plate 20 refers to a plate-shaped member that can heat the battery cell 100. The heating plate 20 can heat the battery cell 100 passively, such as the heating plate 20 can be made of materials with high thermal conductivity such as copper and aluminum. When the heating plate 20 is located in a heating environment, due to the high thermal conductivity of the heating plate 20, it is easier to concentrate heat and increase the temperature, and then due to the temperature difference, the battery cell 100 is heated. The heating plate 20 can also actively heat the battery cell 100, such as a heat source is provided in the heating plate 20, and heat is actively generated by the heat source to heat the battery cell 100.

[0125] 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 anti-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 the battery cell 100 is supported by the tray 210.

[0126] The sub-region 2101 refers to a local area on one side of the tray 210 for supporting the battery cells 100 .

[0127] 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 ​​one side of the tray 210 for supporting the battery cells 100 .

[0128] By dividing one 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, and since the area of ​​the tray 210 is fixed, the area of ​​each sub-area 2101 is equal, then when heating, the heating power of each sub-area 2101 is similar, so that the temperature rise of the battery cell 100 in each sub-area 2101 can be more consistent, thereby improving the baking and heating efficiency of the battery cell 100.

[0129] In some embodiments, the plurality of sub-regions 2101 are arranged in a rectangular array.

[0130] Arranging the plurality of sub-regions 2101 in a rectangular array facilitates dividing a side of the tray 210 used to support the battery cells 100 into sub-regions 2101 , and also makes it easier to evenly arrange the areas of the sub-regions 2101 to be equal.

[0131] 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 .

[0132] 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 one side of the battery cell 100 supported on the tray 210, so that 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.

[0133] The first positioning groove 211 is provided in the sub-region 2101 so as to position the battery cell 100 when supporting the battery cell 100 , so as to stably support the battery cell 100 and heat the battery cell 100 .

[0134] In some embodiments, the plurality of first positioning slots 211 on the entire tray 210 are distributed in an array on the tray 210 .

[0135] 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.

[0136] In some embodiments, the area ratio of each first positioning groove 211 to the corresponding sub-region 2101 is equal, so that the size of the battery cells 100 required to be heated in each sub-region 2101 is equal, thereby making the heating speed of the battery cells 100 in each sub-region 2101 more consistent.

[0137] In some embodiments, the depth range of the first positioning groove 211 can be 0-20mm, such as the depth of the first positioning groove 211 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc., so as to position the battery cell 100.

[0138] 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 , and a sub-region 2101 is provided on a side of the heat conducting plate 201 facing away from the heat source plate 202 .

[0139] 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.

[0140] The heat conducting plate 201 refers to a plate having heat conducting properties, such as a copper plate, an aluminum plate, etc.

[0141] A heat source plate 202 is provided to generate heat to heat the battery cell 100; and a heat conducting plate 201 is provided to better conduct the heat generated by the heat source plate 202 to the battery cell 100, and 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, so that when heating multiple battery cells 100, the heating efficiency of the multiple battery cells 100 can be made more consistent, so as to improve the heating efficiency of the multiple battery cells 100.

[0142] In some embodiments, the heat source plate 202 includes a thermally conductive adhesive layer 2021 and heating wires 2022 uniformly distributed in the thermally conductive adhesive layer 2021 .

[0143] The heating wire 2022 refers to a metal wire or a conductive wire that can generate heat when powered. The thermal conductive adhesive layer 2021 can be thermal conductive rubber or thermal conductive silica gel, etc., which can conduct the heat generated by the heating wire 2022 to quickly conduct the heat to the thermal conductive plate 201.

[0144] The heating wires 2022 are evenly distributed in the thermally conductive adhesive layer 2021, which means that the heating wires 2022 occupy a certain proportion in the 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 in the thermally conductive adhesive layer 2021 can make the heat generated by the heat source plate 202 more uniform, and thus make the heat on the side of the thermally conductive plate 201 used to support the battery cell 100 more uniform.

[0145] The heating wire 2022 is placed in the heat conductive adhesive layer 2021, and the heating wire 2022 is protected by the heat conductive adhesive layer 2021. The heating wire 2022 is easy to manufacture and easy to control the heating of the heating wire 2022. In addition, the heat source plate 202 can have good deformation ability and can better fit with the heat conductive plate 201 so that heat is transferred to the heat conductive plate 201.

[0146] 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 manufactured heating plate 20.

[0147] 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.

[0148] Since heat will be dispersed when 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-area 2101 can be made more uniform, so that the temperature rise consistency of the battery cell 100 is better, thereby improving the baking and heating efficiency of the battery cell 100.

[0149] In some embodiments, the heating plate 20 further includes a support plate 203 , the heat source plate 202 is supported on the support plate 203 , and the support plate 203 is located on a side of the heat source plate 202 away from the heat conducting plate 201 .

[0150] The support plate 203 refers to a plate member used to support the heat source plate 202. The support plate 203 is disposed on the side of the heat source plate 202 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.

[0151] 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 .

[0152] 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, so as to better heat the battery cell 100 .

[0153] In some embodiments, the support plate 203 can be made of 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 the cost.

[0154] 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 .

[0155] The reflector 204 is a plate used to reflect light.

[0156] 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 the heat.

[0157] 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 can have 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 the cost.

[0158] 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 a side of the support plate 203 away from the heat source plate 202, so that the heat dissipated from the support plate 203 in a direction away from the heat conducting plate 201 can be reflected by the reflective plate 204 to improve the utilization rate of the heat.

[0159] 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 .

[0160] 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 as to make the temperature rise of the battery cell 100 more consistent, thereby improving the efficiency of baking and heating the battery cell 100.

[0161] See also Figure 7and Figure 8 , Figure 7 Schematic diagram of the exploded structure of the heating plate 20 provided in some embodiments of the present application.

[0162] Figure 8 Schematic diagram of the exploded structure of the heating plate 20 provided in some other embodiments of the present application.

[0163] 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.

[0164] The sub-block 2020 refers to a smaller heat source plate 202. Multiple sub-blocks 2020 are spliced ​​to form a heat source plate 202, and 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, so that the temperature of the battery cells 100 on the tray 210 is more consistent, so as to improve the efficiency of baking and heating the battery cells 100.

[0165] In some embodiments, please refer to Figure 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 .

[0166] See also Figure 7 In some embodiments, the heat source plate 202 is divided into multiple sub-blocks 2020 from the middle to the edge, and 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.

[0167] See also Figure 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 of different positions along the length direction of the heating plate 20 to facilitate heating of the battery cells 100 .

[0168] See also Figure 2 , Figures 6 to 8 In some embodiments, when the heat source plate 202 is spliced ​​with multiple sub-blocks 2020, the shape and setting method of each sub-block 2020 can be as follows:

[0169] 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 the battery cell 100. The first heat conducting plate needs to be consistent with the structure of the heat conducting plate 201 in the heating plate 20 to be manufactured.

[0170] The temperature of the surface of the first heat conducting plate used to support the battery cell 100 is detected to obtain temperature data at various locations on the surface. Based on the surface temperature data, the temperature of the surface of the first heat conducting plate is divided into regions, and then small heat source plates are set accordingly. The small heat source plates can be called sub-blocks 2020, so that the sub-blocks 2020 corresponding to the multiple sub-regions are spliced ​​to form the entire spliced ​​heat source plate 202, and the power and temperature of each sub-block 2020 can be controlled separately, so that the battery cells 100 in the corresponding areas of each sub-block 2020 can be heated and heated more evenly.

[0171] In some embodiments, when heating the first heat conducting plate with the whole heat source plate attached thereto, the whole first heat conducting 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.

[0172] In some embodiments, during the heating process of the first heat conducting plate, temperature data at various locations on the surface may be recorded, so as to facilitate analysis of changes in the surface temperature of the first heat conducting plate at different times.

[0173] In some embodiments, the surface can be divided into regions according to the temperature data of the time when the surface temperature difference of the first heat conducting plate is the largest. The time when the surface temperature difference of the first heat conducting plate is the largest indicates that the surface of the first heat conducting plate is heated most unevenly at this time. In this way, the temperature of the surface of the first heat conducting plate is divided into regions at this time, and the obtained sub-blocks 2020 can better control the temperature rise at different times, thereby making the battery cells 100 corresponding to the areas of each sub-block 2020 heated more evenly.

[0174] In some embodiments, the division of each sub-region can be based on the surface temperature data of the first heat conducting plate to obtain the surface temperature difference data and the average temperature, and then the surface can be divided into sub-regions based on the temperature difference data and the average temperature, as well as the set temperature gradient, which can facilitate the division of the sub-regions.

[0175] In some embodiments, the division of each sub-region can be based on the temperature data when the temperature difference of the entire surface of the first heat conducting plate is the largest. When the temperature difference of the entire surface of the first heat conducting plate is the largest, 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. The temperature gradient of the sub-region is set to 2T, that is, when partitioning, the difference in the average temperature of two sub-regions with similar temperatures is 2T. Then the insulation value of the sub-region temperature range relative to the upper and lower limits of the average temperature of the sub-region is T. With P + 2KT ± T as the temperature range, the entire surface of the first heat conducting plate is divided into N sub-regions, N is an odd number, K is an integer, then P + 2│K│T <F1<P+2│K│T+T,

[0176] │K│ is the absolute value of K, (F1-P) / T≤N<(F1-P) / T+2. According to the above temperature range and temperature gradient, the shape of each sub-region is divided, and the corresponding sub-block 2020 of the heat source plate is made according to the shape of each sub-region. The made sub-blocks 2020 are then spliced ​​to form a spliced ​​heat source plate 202 adapted to the first heat conducting plate, and this spliced ​​heat source plate 202 can control the heating temperature of each sub-block 2020 respectively. When applied to the heating plate 20, the spliced ​​heat source plate 202 can be attached to the first heat conducting plate to heat the first heat conducting plate, and then the battery cell 100 on the first heat conducting plate can be heated. The above P+2KT±T ​​temperature range refers to the temperature range from P+2KT-T to P+2KT+T.

[0177] For example, if the temperature gradient mentioned above is 2T=2℃; 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+2℃±1℃ corresponds to the second sub-area; when K=-1, the temperature range area of ​​P+2KT±T=P-2℃±1℃ corresponds to the third sub-area; when K=2, the temperature range area of ​​P+2KT±T=P+4℃±1℃ corresponds to the fourth sub-area; when K=-2, the temperature range area of ​​P+2KT±T=P-4℃±1℃ corresponds to the fifth sub-area, until it is divided into the Nth sub-area.

[0178] Of course, as the above-mentioned temperature gradient 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.

[0179] In some embodiments, before heating the first heat conducting plate, a battery cell 100 can be set on the first heat conducting plate. In this way, during heating, the temperature data of the surface of the first heat conducting 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, a temperature collection point may be set at the average temperature of each sub-block 2020 corresponding to the sub-region according to the temperature data when the temperature difference of the entire surface is the largest. In this way, when in 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, so that the heating consistency of multiple battery cells 100 is better, so as to improve the baking and heating efficiency of 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] When in use, the temperature collected at the average temperature of the sub-block 2020 corresponding to the temperature range area 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 spliced ​​with multiple sub-blocks 2020, each sub-block 2020 can be made using a heating wire 2022 arranged 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 uniformly distributed in the thermally conductive adhesive layer 2021.

[0185] The heating wire 2022 is placed in the heat conductive adhesive layer 2021, and the heating wire 2022 is protected by the heat conductive adhesive layer 2021. The heating wire 2022 is easy to manufacture and easy to control the heating of the heating wire 2022. In addition, the sub-block 2020 of the heat source plate 202 can have good deformation ability and can better fit with the heat conductive plate 201 so that heat is transferred to the heat conductive plate 201.

[0186] See also Fig. 9 , Fig. 9 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 cell 100 away from the tray 210 and heat the battery cell 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 the battery cell 100 is heated, the tray 210 heats the battery cell 100 in the direction of the cover plate 220, and the cover plate 220 heats the battery cell 100 in the direction of 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 disposed on the battery cell 100 so as to position and support the battery cell 100 through the cooperation of 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 increasing 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 outer shell 12, the size of the electrode assembly 11 is smaller than the internal space of the outer shell 12, which results in gaps between the electrode assembly 11 and the inner surface of the outer shell 12, and air exists in these gaps.

[0191] During heating, one side of the battery cell 100 is supported on the baking fixture, so that the baking fixture heats one side of the outer shell 12 of the battery cell 100, and the heat is conducted to the air inside the outer shell 12 through the side of the outer shell 12, and then to the electrode assembly 11, so as to conduct the heat to the electrode assembly 11, thereby heating the electrode assembly 11, until the temperature of the entire electrode assembly 11 reaches the set temperature range, and then the heat is kept warm. For example, the bottom surface of the height direction Z of the battery cell 100 can be supported on the baking fixture, and the heat enters the inside of the outer shell 12 from the bottom surface of the outer shell 12, and is conducted to the gap air between the outer shell 12 and the bottom of the electrode assembly 11, and then is conducted to the bottom of the electrode assembly 11, and is conducted upward until the temperature of the entire electrode assembly 11 reaches the set temperature range, and then the heat is kept warm. Of course, one side of the thickness direction Y of the battery cell 100 can also be supported on the baking fixture to heat the battery cell 100 along the thickness direction Y. This method has a low heating efficiency for the electrode assembly 11.

[0192] When the support plate 15 is provided in the battery cell 100, there will be an air gap between the support plate 15 and the bottom of the shell 122, and there will also be an air gap between the support plate 15 and the electrode assembly 11. When heat is conducted from bottom to bottom, the heat at the bottom of the shell 122 will be conducted to the air gap between the support plate 15 and the shell 122, then to the support plate 15, and then to the air gap between the support plate 15 and the shell 122 electrode assembly 11, and then to the electrode assembly 11 to heat the electrode assembly 11. In this structure, there are multiple air gaps on the heating path in the height direction Z, which will also reduce the 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] From the structural description of the battery cell 100, it can be seen that when the battery cell 100 is heated by using a baking tray, the battery cell 100 is supported on the baking tray. The heat is transferred from the baking tray to the side of the battery cell 100 close to the baking tray, and then gradually to the inside of the battery cell 100 to heat the electrode assembly 11 until the temperature of the entire electrode assembly 11 reaches the set temperature range, and then the temperature is kept. However, since there are many air gaps in the heat conduction path inside the battery cell 100, and the thermal conductivity of air is low, generally only 0.026W / (m·℃), it will affect the heat conduction efficiency, resulting in low heating efficiency of 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 1m thick material is 1 degree (K, ℃). The unit is watt / meter degree (W / (m·K), where K and ℃ are both temperature units, K refers to Kelvin temperature (also called thermodynamic temperature), and ℃ refers to Celsius temperature. Each K is equal to each ℃, that is, 1W / (m·K) is equal to 1W / (m·℃), and the unit of thermal conductivity can be expressed as W / (m·K) or W / (m·℃). Thermal conductivity can reflect the thermal conduction efficiency of the material.

[0196] In some embodiments, an electrode terminal 13 is disposed 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 pole ear 111 of the electrode assembly 11, the pole ear 111 is connected to the current collector of the pole piece, and the electrode terminal 13, the pole ear 111, and the current collector are all made of materials with high thermal conductivity; for example, the negative electrode part of the battery cell 100, the negative current collector, the negative pole ear, and the negative electrode terminal 13 are mostly made of copper and other materials, and the thermal conductivity of copper is 385W / (m·℃); for example, the positive electrode part, the positive current collector, the positive pole ear, and the positive electrode terminal 13 are mostly made of aluminum and other materials, and the thermal conductivity of aluminum is 236W / (m·℃). In this way, the electrode terminal 13 is heated, and then the heat can be quickly transferred to the pole ear 111 and then to the current collector to heat the active material layer on the current collector, so that the entire electrode assembly 11 can be quickly heated to improve the 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 pole 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 opposite to each other. The first surface 101 is provided with an electrode terminal 13 . 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 a surface of the battery cell 100 where the electrode terminal 13 is disposed, and the second surface 102 refers to a surface of the battery cell 100 opposite to the first surface 101. Figure 1 In this embodiment, the side of the end cap 121 of the battery cell 100 away from the shell 122 is the first side 101, and the bottom surface of the shell 122 is the second side 102. It can be understood that when the electrode terminal 13 of the battery cell 100 is located on the other side of the shell 122, the side is the first side 101 of the battery cell 100.

[0201] When in 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 further supports the battery cell 100, and the cover plate 220 covers the first side 101 of the battery cell 100, and the tray 210 heats the battery cell 100 mainly from the second side 102 to the first side 101, and the cover plate 220 heats the battery cell 100 mainly from the first side 101 to the second side 102. The first side 101 is provided with an electrode terminal 13, and when the cover plate 220 heats the first side 101 of the battery cell 100, the electrode terminal 13 can be heated more quickly, and then the heat can be quickly transferred to the tab 111 and then to the current collector, so as to heat the active material layer on the current collector, and thus the entire electrode assembly 11 can be quickly heated to improve the 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 pole ear 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 pole ear 111. Through the higher thermal conductivity of the pole ear 111, the pole 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, so as to improve 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 used to cover the battery cell 100 can be set to be flat to facilitate processing and manufacturing.

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

[0205] In some embodiments, electrode terminals 13 are respectively disposed 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 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 the two opposite sides of the battery cell 100 respectively. Since the pole ear 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 pole ear 111, so that the pole piece of the electrode assembly 11 can be quickly heated through the higher thermal conductivity of the pole ear 111, so as to realize the rapid heating of the electrode assembly 11 inside the battery cell 100 through the electrode terminal 13, so as to improve the heating efficiency.

[0207] See also Fig.10 , Fig.10 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 read Figure 1 In some embodiments, a plurality of receiving grooves 222 are provided on the cover plate 220 , and the receiving grooves 222 are used to accommodate the electrode terminals 13 on the battery cells 100 .

[0209] The receiving groove 222 refers to a groove structure provided on the cover plate 220. The shape and size of the receiving groove 222 are adapted to the electrode terminal 13, so that when the cover plate 220 is covered on the battery cell 100, the electrode terminal 13 can be placed in the receiving groove 222, so that the cover plate 220 can better contact with the electrode terminal 13, increase the contact area between the cover plate 220 and the electrode terminal 13, and increase the heating area of ​​the cover plate 220 on the electrode terminal 13, so as to conduct heat to the electrode terminal 13 more quickly.

[0210] The receiving groove 222 is provided on the cover plate 220 to receive the electrode terminal 13 on the battery cell 100 , thereby increasing the contact area between the cover plate 220 and the electrode terminal 13 , thereby improving the heating efficiency of the cover plate 220 on the electrode terminal 13 .

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

[0212] By making the cover plate 220 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, so as to increase the heating area of ​​the battery cell 100 by the cover plate 220 , thereby heating the battery cell 100 more quickly.

[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 , thereby improving the 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 set. A groove structure can be set on the cover plate 220 to allow the electrode terminal 13 to be placed therein, so that the cover plate 220 is in contact with 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 another example, in some embodiments, the cover plate 220 covers the side of the battery cell 100 where the electrode terminal 13 is not provided, and 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 located.

[0216] In some embodiments, the cover plate 220 covers the side of the battery cell 100 where the electrode terminal 13 is set, 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 matching surface 22 refers to a surface that can be matched with a set surface to achieve a greater degree of fit with the set surface; in this embodiment, the matching surface 22 refers to a surface of the cover plate 220 that is away from the tray 210 and the surface on which the components on the surface fit well. 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 matched with the surface of the end cover 121 of the battery cell 100, so that the groove wall surface of the receiving groove 222 and the peripheral area of ​​the receiving groove 222 can jointly form the matching surface 22.

[0219] 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 .

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

[0222] See also Fig.11 , Fig.11 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 read Figure 1 In some embodiments, a second positioning groove 221 is provided on the cover plate 220 , and 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 a side of the battery cell 100 close to the cover plate 220, so that when the battery cell 100 is installed, 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, so as 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 may 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 may form the adapting surface 22 together. 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 the heating efficiency.

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

[0228] See also Fig.12 , Fig.12 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 also read 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 is adapted to contact the first surface 101, and the cover plate 220 covers the second surface 102.

[0230] The first surface 101 refers to a surface of the battery cell 100 where the electrode terminal 13 is disposed, and the second surface 102 refers to a surface of the battery cell 100 opposite to the first surface 101. Figure 1 In this embodiment, the side of the end cap 121 of the battery cell 100 away from the shell 122 is the first side 101, and the bottom surface of the shell 122 is the second side 102. It can be understood that when the electrode terminal 13 of the battery cell 100 is located on the other side of the shell 122, the side is the first side 101 of the battery cell 100.

[0231] The contour surface 21 refers to a surface that can be adapted to a set surface to achieve a greater degree of fit with the set surface; for example, in this embodiment, the contour 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 pole piece of the electrode assembly 11 can be quickly heated to improve the heating efficiency.

[0233] In some embodiments, a first positioning groove 211 may be provided on the tray 210, and a groove 212 may be provided at the bottom of the first positioning groove 211, and the shape and size of the groove 212 are adapted to the electrode terminal 13. The first positioning groove 211 is used for the end of the battery cell 100 where the first surface 101 is located to be placed, and the first positioning groove 211 is adapted to fit with the first surface 101, and the groove wall surface of the groove 212 is in contact with the electrode terminal 13, so that the bottom surface of the first positioning groove 211 and the groove wall surface of the groove 212 jointly form the contour 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 inverted on the tray 210, that is, the end cap 121 is placed on the tray 210, and the cover plate 220 covers the bottom surface of the battery cell 100, so as to heat the battery cell 100.

[0235] In some embodiments, please refer to Fig.11 and Fig.12 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 adapting surface 22 can be provided on the cover plate 220, so that the tray 210 and the cover plate 220 can respectively contact and heat the electrode terminals 13 on two opposite sides of the battery cell 100 to improve the 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 a battery cell 100 and heat the battery cell 100; one 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 used to conduct the heat of 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, and each sub-area 2101 occupies an equal area ratio of the tray 210, the heating power of each sub-area 2101 is similar during heating, so that the temperature rise of the battery cells 100 in each sub-area 2101 can be more consistent, thereby improving the efficiency of baking and heating the battery cells 100. Multiple sub-blocks 2020 are spliced ​​to form a heat source plate 202, and 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, so that the temperature rise of the battery cells 100 on the tray 210 can be more consistent, 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, and the battery baking jig 200 can be placed in the baking oven 300 so as to bake the battery cells 100 on the battery baking jig 200 in the baking oven 300. In addition, the baking oven 300 is provided to bake the battery baking jig 200 and the battery cells 100, and a more stable baking environment can be provided to improve the heating efficiency of the battery cells 100, and it is also beneficial to extract ambient air during the heat preservation stage to improve 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 schemes; or, including the battery baking device 1000 described in any of the above schemes.

[0241] Please refer again Figure 4 , Figures 6 to 8 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 matched with the first heat conducting plate, and attaching the whole heat source plate to the first heat conducting plate;

[0243] The whole heat source plate is attached to the first heat conducting plate to form a simulated heating plate 20 structure, which is convenient for simulating heating of the battery cell 100. The structure of the first heat conducting plate needs to be the same as the structure of the heat conducting plate 201 of the heating plate 20 to be manufactured.

[0244] The first heat conducting plate with the whole heat source plate attached thereto is heated to obtain temperature data of various locations on the surface of the first heat conducting plate for supporting the battery cells;

[0245] The first heat conducting plate to which the whole heat source plate is attached is heated to simulate the temperature rising process of the first heat conducting plate when it is working.

[0246] Divide the surface into a plurality of sub-regions according to the temperature data of the surface;

[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, and the shape and size of each sub-region and the separation position between adjacent sub-regions can be better determined.

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

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

[0250] According to the shape of each sub-region, a small heat source plate is set accordingly. The small heat source plate can be called a sub-block 2020. The sub-blocks 2020 corresponding to multiple sub-regions are spliced ​​to form the entire spliced ​​heat source plate 202. The power and temperature of each sub-block 2020 can be controlled separately, so that the battery cells 100 in the corresponding areas of each sub-block 2020 can be heated more evenly.

[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 of the heating plate 20 to be manufactured.

[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 both are heat conducting plates 201 for manufacturing the heating plate 20. In the heating plate manufacturing method of the present invention, the first heat conducting plate and the second heat conducting plate are used only to facilitate the distinction of the heat conducting plates in different steps.

[0254] In some embodiments, dividing the surface into a plurality of sub-regions based on the 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 the temperature gradient, the surface is divided into a plurality of sub-areas.

[0256] 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.

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

[0258] The surface temperature difference data is obtained based on the surface temperature data, and the surface is divided into a plurality of sub-areas based on the temperature data when the surface temperature difference is the largest.

[0259] The moment when the surface temperature difference of the first heat conducting plate is the largest indicates that the surface of the first heat conducting plate is heated most unevenly at this moment. Therefore, at this time, dividing the regions according to the surface temperature of the first heat conducting plate can 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 a plurality of 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, taking P + 2KT ± T as the temperature range, dividing the entire surface of the first heat conducting plate into N sub-regions, N being an odd number, and K being an integer; and,

[0262] P = (F1 + F2) / 2,

[0263] P + 2│K│T < F1 < P + 2│K│T + T, │K│ being the absolute value of K,

[0264] (F1 - P) / T ≤ N < (F1 - P) / T + 2.

[0265] According to the above temperature range and temperature gradient, divide the shapes of the respective sub-regions, and respectively fabricate corresponding sub-blocks 2020 of the heat source plate according to the shapes of the respective sub-regions. Then splice the fabricated sub-blocks 2020 to form a spliced heat source plate 202 adapted to the first heat conducting plate, and this spliced heat source plate 202 can respectively control the heating temperatures of the respective sub-blocks 2020. When applied to the heating plate 20, the spliced heat source plate 202 can be attached to the first heat conducting plate to heat the first heat conducting plate, and thus the battery cells 100 on the first heat conducting plate can be heated. The above temperature range of P + 2KT ± T refers to the temperature range from P + 2KT - T to P + 2KT + T.

[0266] For example, when the above temperature gradient 2T = 2°C; 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 + 4°C ± 1°C corresponds to the fourth sub-region; when K = -2, the temperature range region of P + 2KT ± T = P - 4°C ± 1°C corresponds to the fifth sub-region, until the Nth sub-region is divided.

[0267] Of course, as the above-mentioned temperature gradient 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.

[0268] Through the above method, the shape of each sub-area 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, so as to improve the baking and heating efficiency of the battery cell 100.

[0269] In some embodiments, before obtaining the heating plate 20, the steps are further included:

[0270] 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.

[0271] When in 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, so that the heating consistency of multiple battery cells 100 can be better, thereby improving the heating efficiency of the battery cells 100.

[0272] 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.

[0273] In some embodiments, the temperature collection point is provided with a temperature sensor.

[0274] 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 .

[0275] 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.

[0276] When in use, the temperature collected at the average temperature of the sub-block 2020 corresponding to the temperature range area 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.

[0277] In some embodiments, when the heat source plate 202 is spliced ​​with multiple sub-blocks 2020, each sub-block 2020 can be made using a heating wire 2022 arranged 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 uniformly distributed in the thermally conductive adhesive layer 2021.

[0278] The heating wire 2022 is placed in the thermally conductive adhesive layer 2021, and the heating wire 2022 is protected by the thermally conductive adhesive layer 2021. The heating wire 2022 is easy to manufacture and easy to control the heating of the heating wire 2022. In addition, the sub-block 2020 of the heat source plate 202 can have good deformation ability and can better fit with the second heat conducting plate so that heat is conducted to the second heat conducting plate.

[0279] 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.

[0280] Since heat will be dispersed when 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-area 2101 can be made more uniform, so that the temperature rise consistency of the battery cell 100 is better, thereby improving the baking and heating efficiency of the battery cell 100.

[0281] In some embodiments, before obtaining the heating plate 20, the steps are further included:

[0282] A support plate 203 is provided, and the combined heat source plate 202 is attached to the support plate 203 , and the support plate 203 is located on a side of the combined heat source plate 202 away from the second heat conducting plate.

[0283] The support plate 203 is provided so that the support plate 203 cooperates with the second heat conducting plate to clamp the combined heat source plate 202 , thereby protecting the combined heat source plate 202 .

[0284] 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, so as to better heat the battery cell 100 .

[0285] In some embodiments, the support plate 203 can be made of 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 the cost.

[0286] In some embodiments, before obtaining the heating plate 20, the steps are further included:

[0287] 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.

[0288] 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, so as to improve the utilization rate of the heat.

[0289] 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 can have 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 the cost.

[0290] 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 a side of the support plate 203 away from the heat source plate 202, so that the heat dissipated from the support plate 203 in a direction away from the second heat conducting plate can be reflected by the reflective plate 204 to improve the utilization rate of the heat.

[0291] In some embodiments, before heating the first heat conducting plate with the whole heat source plate attached thereto, the method further comprises:

[0292] The battery cells 100 are placed on the first heat conducting plate.

[0293] The battery cell 100 is arranged on the first heat conducting plate, so that when the baking heating is performed, 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 then 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.

[0294] In some embodiments, the step of heating the first heat conducting plate with the whole heat source plate attached thereto comprises:

[0295] The first heat conducting plate with the whole heat source plate attached thereto is placed in a baking oven 300 for heating.

[0296] Heating in the oven 300 can better simulate the use environment of the heating plate, and further simulate the heating environment of the battery cell 100 .

[0297] 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 of 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.

[0298] 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.

[0299] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, and according to the temperature difference data and the average temperature, the temperature gradient is set to divide the surface 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: The temperature difference data of the surface is obtained according to the temperature data of the surface, and the surface is divided into a plurality of sub-areas according to the temperature data when the temperature difference of the surface is the largest.

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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