Preparation Method and System of Battery Device, Battery Device, Electronic Device

Abstract

The present application provides a preparation method and system for a battery device, a battery device, and an electronic device. The preparation method of the battery device includes: acquiring a topographic image of the bottom wall of the battery box body; the topographic image includes a gluing area; dividing the gluing area into a plurality of sub-gluing areas; calculating the amount of glue to be applied to each sub-gluing area according to the flatness of each sub-gluing area; and coating a corresponding amount of glue on each sub-gluing area by using a gluing device according to the amount of glue to be applied to each sub-gluing area. Through the above settings, the amount of glue applied can be adjusted according to the concave and convex conditions at different positions of the bottom wall of the battery box body, and good flatness of the surface of the glue layer can be maintained.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a preparation method and system for a battery device, a battery device, and an electronic device. Background Art

[0002] As a new generation of energy storage and conversion device, the battery is widely used in fields such as portable electronic devices and electric vehicles. As a core component that provides power for electric vehicles, the safety performance of the battery is very important.

[0003] The battery includes a box body and battery cells disposed inside the box body. Usually, glue is applied between the bottom wall of the box body and the battery cells to fix the battery cells and maintain electrical insulation between the box body and the battery cells, so as to maintain the safety of the battery.

[0004] However, currently, the flatness of the bottom wall of the battery box body is poor, and the flatness of the glue layer formed by applying glue to the bottom wall of the box body is poor, and the consistency of the glue layer thickness cannot be guaranteed. Summary of the Invention

[0005] The present application provides a preparation method and system for a battery device, a battery device, and an electronic device, which can maintain good flatness of the glue application on the bottom wall of the battery box body.

[0006] To solve the above technical problems, in a first aspect of the present application, a preparation method for a battery device is provided, including: collecting a topography image of the bottom wall of the battery box body; the topography image includes a glue application area; dividing the glue application area into a plurality of sub-glue application areas; calculating the amount of glue to be applied to each sub-glue application area according to the flatness of each sub-glue application area; and applying a corresponding amount of glue to each sub-glue application area by using a glue application device according to the amount of glue to be applied to each sub-glue application area. The preparation method of the battery device further includes: setting an elastic insulating layer on the bottom wall of the battery box body; the glue application area is located in an area outside the elastic insulating layer.

[0007] By applying glue to the bottom wall of the battery box body through the above glue application method provided by the embodiments of the present application, the amount of glue applied can be adjusted according to the concave and convex conditions of different positions of the bottom wall of the battery box body, so as to maintain good flatness of the surface of the glue layer after the battery cells are put into the box and the consistency of the height of the glue layer between the battery cells and the bottom wall of the battery box body.

[0008] By setting an elastic insulating layer on the bottom wall of the battery box body, when pressing the battery cell module, the battery cell module contacts the elastic insulating layer, and the elastic insulating layer plays a role in buffering the battery cells, reducing the deformation of the bottom wall of the battery box body caused by the extrusion of the battery cells. After the force is removed, the bottom wall of the battery box body basically does not rebound, reducing the occurrence of the problem of dendritic glue layer caused by the pulling of the glue layer due to the rebound of the bottom wall of the battery box body after the force is removed.

[0009] In one embodiment, the step of dividing the gluing area into multiple sub - gluing areas includes: dividing the gluing area into multiple sub - gluing areas with the same area.

[0010] By dividing the gluing area into multiple sub - gluing areas with the same area, the division method is simple and easy to operate, reducing the complexity caused by the area difference of the sub - gluing areas.

[0011] In one embodiment, the step of calculating the amount of glue to be applied to each sub - gluing area according to the flatness of each sub - gluing area includes: obtaining a fitting plane according to the flatness of the sub - gluing area; obtaining the amount of glue to be applied to the sub - gluing area according to the fitting plane and the ideal plane; wherein, the ideal plane is the top surface of the preset glue layer.

[0012] By fitting the flatness of the sub - gluing area to obtain a fitting plane, and calculating the amount of glue to be applied to the sub - gluing area according to the fitting plane and the ideal plane, the calculation method is simple and accurate. It can adjust the amount of glue applied according to the actual concave - convex situation of each sub - gluing area, keep the surface of the glue layer in each sub - gluing area flat, and thus keep the entire surface of the glue layer on the bottom wall of the battery box flat.

[0013] In one embodiment, the step of obtaining the amount of glue to be applied to the sub - gluing area according to the fitting plane and the ideal plane includes: calculating the volume of the area between the fitting plane and the ideal plane according to the fitting plane and the ideal plane; obtaining the mass of glue to be applied to the sub - gluing area according to the volume of the area between the fitting plane and the ideal plane and the density of the colloid.

[0014] For the gluing equipment, controlling the gluing quality is easier and more accurate than controlling the gluing volume. Therefore, obtaining the mass of glue to be applied to the sub - gluing area according to the volume of the area between the fitting plane and the ideal plane and the density of the colloid is beneficial to the precise control of the gluing equipment, keeping the error between the actual amount of glue applied to each sub - gluing area and the calculated amount of glue small, keeping the surface of the glue layer in each sub - gluing area flat, and thus keeping the entire surface of the glue layer on the bottom wall of the battery box flat.

[0015] In one embodiment, the step of applying the corresponding amount of colloid to each sub - gluing area by using the gluing equipment according to the amount of glue to be applied to each sub - gluing area includes: obtaining the glue output per unit time when the gluing equipment applies glue to each sub - gluing area according to the mass of glue to be applied to each sub - gluing area and the gluing cycle of the gluing equipment; wherein, the gluing cycle of the gluing equipment is the gluing duration of the gluing equipment in each sub - gluing area; controlling the gluing equipment to apply glue to each sub - gluing area according to the glue output per unit time when the gluing equipment applies glue to each sub - gluing area.

[0016] In an embodiment of the present application, the gluing of each sub-gluing area is controlled according to the mass of glue to be applied in each sub-gluing area and the gluing rhythm of the gluing equipment. While maintaining good flatness on the surface of the glue layer in each sub-gluing area, a high gluing efficiency is maintained, which is beneficial to the optimization and stable operation of the gluing process.

[0017] In one embodiment, the step of controlling the gluing equipment to glue each sub-gluing area according to the glue output per unit time when the gluing equipment glues each sub-gluing area includes: dividing multiple sub-gluing areas into multiple groups according to the different glue outputs per unit time when the gluing equipment glues each sub-gluing area; wherein, the glue outputs per unit time corresponding to the sub-gluing areas in the same group are the same; and gluing the sub-gluing areas of multiple groups in sequence according to the order of the glue output per unit time from high to low.

[0018] In an embodiment of the present application, by gluing the sub-gluing areas of multiple groups in sequence according to the order of the glue output per unit time from high to low, the gluing trajectory is optimized. Since the stacking height of the colloid in the sub-gluing area with a large glue amount is usually large, when the gluing of the sub-gluing area with a small glue amount ends, there is a longer time for the colloid in the sub-gluing area with a large glue amount to spread under the action of gravity. During the process of the battery monomers being grouped and put into the box, it is beneficial to make the surfaces between the sub-gluing areas tend to be in the same plane, and it is easier for the battery monomer module to contact the colloid in multiple sub-gluing areas simultaneously.

[0019] In one embodiment, the step of setting the elastic insulating layer on the bottom wall of the battery box is carried out before the step of collecting the topography image of the bottom wall of the battery box; the gluing area is located in the area outside the elastic insulating layer.

[0020] By setting the elastic insulating layer on the bottom wall of the battery box before collecting the topography image of the bottom wall of the battery box, the area that needs to be glued on the bottom wall of the battery box can be accurately identified, the probability of coating the glue layer in the area where the elastic insulating layer is set is reduced, the debonding operation on the area where the elastic insulating layer is set is reduced, and the elastic insulating layer can achieve a good buffering effect, reducing the occurrence of the problem of dendritic glue layer caused by the pulling of the glue layer on the bottom wall of the battery box after the force is removed.

[0021] In one embodiment, the elastic insulating layer includes two elastic insulating strips; one elastic insulating strip is arranged on one side of the gluing area, and the other elastic insulating strip is arranged at an interval on the opposite side of the gluing area.

[0022] By making the above settings for the elastic insulating layer, elastic insulating strips are arranged on both opposite sides of the gluing area, and both elastic insulating strips play a buffering role. After pressing the battery monomer to remove the force, the occurrence of the problem of dendritic glue layer caused by the pulling of each position of the glue layer on the bottom wall of the battery box is reduced.

[0023] In one embodiment, in the step of coating a corresponding amount of colloid on each sub-coating area by using a coating device according to the amount of glue to be coated in each sub-coating area, the top surface of the colloid is higher than the top surface of the elastic insulating layer.

[0024] By setting the coating device to coat a corresponding amount of colloid on each sub-coating area, with the top surface of the colloid being higher than the top surface of the elastic insulating layer, during the process of putting the battery cell module into the box, the colloid is first contacted and extruded, and then the elastic insulating layer is contacted and extruded. Among them, when the battery cell module is put into the box, the colloid is extruded, so that the colloid is compressed to the height of the ideal plane, and the colloid fills the entire sub-coating area. After the force for extruding the battery cell module is removed, the elastic insulating layer rebounds partially, playing a pressure relief role.

[0025] In one embodiment, the elastic insulating layer covers 5%-10% of the bottom wall area of the battery box.

[0026] By setting the elastic insulating layer to cover 5%-10% of the bottom wall area of the battery box, it can play a good buffering role, and achieve good reduction of the occurrence of dendritic problems in the glue layer at various positions on the bottom wall of the battery box caused by pulling; at the same time, it makes the coating area on the bottom wall of the battery box have a large enough area to keep the glue layer on the bottom wall of the battery box firmly fix the battery cell module.

[0027] In one embodiment, the thickness of the elastic insulating layer is 1 mm - 2 mm.

[0028] By setting the thickness of the elastic insulating layer as above, the thickness of the elastic insulating layer is appropriate, maintaining the stability of the bonding and fixing between the glue layer and the battery cell module; at the same time, after the battery cell is put into the box, when pressing the battery cell, the elastic insulating layer under the battery cell is compressed and deformed by the force, and the thickness setting of the elastic insulating layer can provide sufficient deformation amount, which can buffer the deformation of the bottom wall of the battery box after the force is removed, and reduce the uneven coating caused by the rebound and pulling of the bottom wall of the battery box on the glue layer.

[0029] In the second aspect of the present application, a preparation system for a battery device is provided, including an assembly module, an image collector, an image processing circuit, a calculation circuit, and a coating device; the assembly module is used to set an elastic insulating layer on the bottom wall of the battery box; the image collector is used to collect the topographic image of the bottom wall of the battery box; the topographic image includes a coating area; the image processing circuit is used to divide the coating area into multiple sub-coating areas; the calculation circuit is used to calculate the amount of glue to be coated in each sub-coating area according to the flatness of each sub-coating area; the coating device is used to coat a corresponding amount of colloid on each sub-coating area according to the amount of glue to be coated in each sub-coating area.

[0030] By making the above settings to the preparation system of the battery device, the glue application amount can be adjusted according to the concave and convex conditions at different positions of the bottom wall of the battery box body, maintaining good flatness on the surface of the glue layer. Furthermore, after the battery cells are put into the box, the consistency of the glue layer height between the battery cells and the bottom wall of the battery box body can be maintained.

[0031] In the third aspect of the present application, a battery device is provided, which includes a battery box body, a plurality of battery cells, an elastic insulating layer, and a glue layer. The battery box body includes a side wall and a bottom wall; the plurality of battery cells are arranged inside the battery box body; the elastic insulating layer is arranged between the plurality of battery cells and the bottom wall; the glue layer is arranged between the plurality of battery cells and the bottom wall and is located in the area not covered by the elastic insulating layer.

[0032] In the embodiment of the present application, by arranging a glue layer between the battery cells and the bottom wall, the glue layer fixes the battery cells and the bottom wall, reducing the shaking or displacement of the battery cells in the battery box body; by arranging a glue layer between the battery cells and the bottom wall, when pressing the battery cell module, the battery cells contact the elastic insulating layer, and after the force is removed, the elastic insulating layer plays a buffering role, and the bottom wall of the battery box body basically does not rebound, reducing the occurrence of the problem of dendritic glue layer caused by the pulling of the glue layer on the bottom wall of the battery box body after the force is removed.

[0033] In one embodiment, the elastic insulating layer includes two elastic insulating strips; one elastic insulating strip is arranged on one side of the glue layer, and the other elastic insulating strip is arranged on the opposite side of the glue layer.

[0034] By making the above settings to the elastic insulating layer, elastic insulating strips are arranged on both opposite sides of the glue layer, and both of the two elastic insulating strips play a buffering role. After pressing the battery cells and removing the force, the occurrence of the problem of dendritic glue layer caused by the pulling of each position of the glue layer on the bottom wall of the battery box body is reduced.

[0035] In one embodiment, the elastic insulating layer covers 5%-10% of the area of the bottom wall.

[0036] By setting the elastic insulating layer to cover 5%-10% of the area of the bottom wall of the battery box body, a good buffering effect can be achieved, and the occurrence of the problem of dendritic glue layer caused by the pulling of each position of the glue layer on the bottom wall of the battery box body can be reduced well; at the same time, the glue layer on the bottom wall of the battery box body has a large enough setting area to keep the glue layer on the bottom wall of the battery box body firmly fix the battery cells.

[0037] In one embodiment, the thickness of the elastic insulating layer is 0.3 mm - 1 mm.

[0038] By making the above settings to the thickness of the elastic insulating layer, the thickness of the elastic insulating layer is appropriate, which can maintain the stability of the bonding and fixing between the glue layer and the battery cells; at the same time, the problem of dendritic glue layer is reduced.

[0039] In one embodiment, the bottom surface of the elastic insulating layer is disposed in contact with the bottom wall, and the top surface of the elastic insulating layer is disposed in contact with the bottom surface of the battery cell.

[0040] By arranging two opposite surfaces of the elastic insulating layer to contact the bottom wall and the bottom surface of the battery cell respectively, a good buffering effect can be achieved, thereby effectively reducing the occurrence of glue layer dendrite problems caused by pulling of the glue layer at various positions on the bottom wall of the battery box.

[0041] In one embodiment, the elastic insulating layer is a foam layer.

[0042] By setting the elastic insulating layer as a foam layer, the foam layer has certain compressibility and resilience deformation capacity, can effectively absorb and disperse the impact force, buffer the deformation of the bottom wall after unloading, and effectively reduce the occurrence of the problem of the glue layer dendrite caused by the pulling of the glue layer at various positions of the bottom wall of the battery box. In addition, the foam layer has a certain adhesive force, which can keep the battery cell and the bottom wall relatively fixed, and reduce the displacement or shaking of the battery cell located above the foam layer.

[0043] In a fourth aspect of the present application, an electronic device is provided, comprising: any one of the above-mentioned battery devices. The electronic device has at least the same advantages as the battery device.

[0044] 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

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 is a schematic diagram of a process for preparing a battery device provided in an embodiment of the present application;

[0047] Figure 2 is a schematic diagram of the top view of the bottom wall of the battery box provided in an embodiment of the present application;

[0048] Figure 3 It is a partial schematic diagram of fitting calculation of the sub-glue coating area provided in an embodiment of the present application;

[0049] Figure 4It is a schematic structural diagram of a preparation system for a battery device provided by an embodiment of the present application;

[0050] Figure 5 It is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0051] Figure 6 It is a top - view structural schematic diagram of the bottom wall of a battery box body provided by an embodiment of the present application;

[0052] Figure 7 is Figure 6 a schematic cross - sectional view along line A - A;

[0053] Figure 8 is Figure 7 an enlarged structural schematic diagram of the indicated area B;

[0054] Figure 9 It is a disassembled structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0055] Figure 10 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application.

[0056] Explanation of reference numerals:

[0057] Gluing area 10, sub - gluing area 101, fitting plane α, ideal plane β, image collector 21, image - processing circuit 22, calculation circuit 23, gluing device 24, battery device 3, battery box body 31, accommodation cavity 310, upper box body 311, lower box body 312, side wall 312a, bottom wall 312b, battery cell 32, end cover 321, electrode terminal 321a, housing 322, battery core assembly 323, elastic insulating layer 33, elastic insulating strip 331, glue layer 34, vehicle 40, controller 401, motor 402. Detailed implementation manners

[0058] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0059] The terms "first", "second", and "third" in this application are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, then the directional indications will also change accordingly. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0062] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0063] The battery includes a box body and battery cells disposed inside the box body. Usually, glue is applied between the bottom wall of the box body and the battery cells to fix the battery cells and maintain electrical insulation between the box body and the battery cells, so as to ensure the high safety of the battery.

[0064] At present, the bottom wall of the box body of the battery generally includes a bottom guard plate and a cooling plate. The bottom guard plate and the water-cooling plate are connected to the profile side beam by FDS (FlowDrill Screw). The flatness of the bottom wall of the box body is poor, and the flatness of the glue layer formed by applying glue to the bottom wall of the box body is also poor. After the battery cells are grouped and put into the box, it is not easy to maintain the consistency of the glue layer thickness.

[0065] In view of this, the embodiments of the present application provide a preparation method and system for a battery device, a battery device, and an electronic device to ensure good flatness of the glue applied to the bottom wall of the battery box body. Specifically, the embodiments of the present application design a method for applying glue to the bottom wall of a battery box body, including: collecting a topographic image of the bottom wall of the battery box body, where the topographic image includes a glue application area; dividing the glue application area into multiple sub-glue application areas; calculating the amount of glue to be applied to each sub-glue application area according to the flatness of each sub-glue application area; and applying a corresponding amount of glue to each sub-glue application area by using a glue application device according to the amount of glue to be applied to each sub-glue application area, so that the flatness of the surface of the glue layer facing away from the bottom wall of the battery box body is good. Herein, the good flatness of the surface of the glue layer facing away from the bottom wall of the battery box body means that the surface of the glue layer on the bottom wall of the battery box body facing away from the bottom wall is infinitely close to a plane.

[0066] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic flowchart of the preparation method for the battery device provided by the embodiments of the present application, Figure 2 and

[0067] The preparation method for the battery device provided by the embodiments of the present application specifically includes:

[0068] Step S01: Collect a topographic image of the bottom wall of the battery box body, where the topographic image includes a glue application area 10.

[0069] In one embodiment, the bottom wall of the battery box body is scanned by a CCD (Charge-Coupled Device) to obtain a topographic image of the bottom wall of the battery box body. The CCD scanning technology uses a CCD image sensor to convert an optical image into an electrical signal, and then generates a digital image. Optionally, during the scanning process, appropriate illumination is required for the bottom wall of the battery box body to ensure that the features on the surface of the bottom wall of the battery box body can be clearly captured by the CCD camera.

[0070] In one embodiment, the bottom wall of the battery box includes a bottom guard plate and a cooling plate; wherein the bottom guard plate and the water cooling plate can be connected to the profile side beam by FDS (Flow Drill Screw). The profile side beam is usually arranged at the edge of the battery box to support and fix the bottom guard plate and the water cooling plate.

[0071] The bottom guard plate is located at the bottom layer, which plays a role in protecting the bottom of the battery cell, reducing the impact and scratching of the battery cell by external objects, and also plays a role in heat insulation and moisture resistance to a certain extent. The bottom guard plate is usually made of materials with certain strength and toughness, such as steel plate, aluminum plate or composite material.

[0072] The water-cooling plate is located on the side of the bottom guard plate close to the battery cell and is an important part of the thermal management system of the battery pack. The main function of the water-cooling plate is to remove the heat generated by the battery cell during the charging and discharging process through circulating coolant to ensure that the battery cell is in a suitable operating temperature range and improve the performance and life of the battery. The water-cooling plate is generally made of metal materials with good thermal conductivity, such as aluminum alloy, and its internal design has complex flow channels so that the coolant can flow evenly through the entire water-cooling plate to achieve efficient heat dissipation.

[0073] Optionally, the battery case further includes an annular side wall, which is arranged around the entire circumference of the bottom wall and is connected to the bottom wall; the entire circumference of the glue layer on the bottom wall of the battery case is spaced apart from the side wall.

[0074] The glue coating area 10 is an area for setting a glue layer to bond the bottom wall of the battery box to the battery cell. In one embodiment, the center area of the bottom wall of the battery box needs to be glued, and the center area of the topographic image is the glue coating area 10. An annular non-glue coating area can also be set around the glue coating area 10.

[0075] Step S02: dividing the glue coating area 10 into a plurality of sub-glue coating areas 101 .

[0076] like Figure 2 As shown, the bottom wall of the battery case includes a glue coating area 10, and the glue coating area 10 is divided into a plurality of sub-glue coating areas 101. The size and shape of each sub-glue coating area 101 are designed according to the flatness requirements of the glue coating layer. It can be understood that the higher the flatness requirements of the glue coating layer, the smaller the area of each divided sub-glue coating area 101, so that the amount of glue required for each sub-glue coating area 101 can be calculated more accurately (i.e., step S03), the accuracy of the glue coating amount of each sub-glue coating area 101 is maintained, and the glue layer surface of each sub-glue coating area 101 is maintained to have good flatness, thereby maintaining the entire glue layer surface of the bottom wall of the battery case to have good flatness.

[0077] Step S03: Calculate the amount of glue to be applied to each sub-glue application area 101 according to the flatness of each sub-glue application area 101.

[0078] Step S04: According to the amount of glue to be applied to each sub-glue application area 101, use a glue application device to apply a corresponding amount of glue to each sub-glue application area 101.

[0079] By applying glue to the bottom wall of the battery box body using the above glue application method provided by the embodiments of the present application, the amount of glue applied can be adjusted according to the concave and convex conditions at different positions of the bottom wall of the battery box body. Furthermore, after the battery cells are placed in the box, the surface of the glue layer can maintain good flatness, and the height of the glue layer between the battery cells and the bottom wall of the battery box body can be consistent.

[0080] In one embodiment, in step S02, the step of dividing the glue application area 10 into multiple sub-glue application areas 101 includes: dividing the glue application area 10 into multiple sub-glue application areas 101 with the same area.

[0081] By dividing the glue application area 10 into multiple sub-glue application areas 101 with the same area, the division method is simple and easy to operate, reducing the complexity caused by the area difference of the sub-glue application areas 101.

[0082] Optionally, the areas of the multiple sub-glue application areas 101 are the same and the shapes are the same. Exemplarily, as Figure 2 shown, the multiple sub-glue application areas 101 divide the glue application area 10 into a grid shape.

[0083] Optionally, as Figure 2 shown, the glue application area 10 is rectangular, and the glue application area 10 is divided into multiple square sub-glue application areas 101 arranged in a two-dimensional array, and each sub-glue application area 101 is a grid.

[0084] In one embodiment, please refer to Figure 3 , Figure 3 is a partial schematic diagram of the fitting calculation of the sub-glue application area provided by the embodiments of the present application. In step S03, the step of calculating the amount of glue to be applied to each sub-glue application area 101 according to the flatness of each sub-glue application area 101 includes: obtaining a fitting plane α according to the flatness of the sub-glue application area 101; obtaining the amount of glue to be applied to the sub-glue application area 101 according to the fitting plane α and the ideal plane β, where the ideal plane β is the top surface of the preset glue layer.

[0085] The amount of glue to be applied to the sub-glue application area 101 can be the mass of the glue to be applied or the volume of the glue to be applied.

[0086] The top surface of the glue layer is the surface of the glue layer facing away from the bottom wall of the battery box body. The preset top surface of the glue layer is a plane, and this plane is parallel and conforms to the surfaces of multiple battery cells close to the bottom wall of the battery box body.

[0087] By fitting the flatness of the sub-gluing area 101, a fitting plane α is obtained. According to the fitting plane α and the ideal plane β, the amount of glue to be applied to the sub-gluing area 101 is calculated. The calculation method is simple and accurate, realizing the adjustment of the glue application amount according to the actual concave and convex conditions of each sub-gluing area 101, keeping the glue layer surface of each sub-gluing area 101 having good flatness, and further keeping the entire glue layer surface of the bottom wall of the battery box having good flatness.

[0088] Optionally, the least squares method is used to fit the actual plane of each sub-gluing area 101 to obtain the fitting plane α. Using the least squares method for fitting, the calculation process is relatively simple and easy to implement, and stable and reliable fitting results can be obtained.

[0089] Optionally, the ideal plane β should be higher than the highest point of the bottom wall of the battery box, keeping a glue layer between the battery cell and the bottom wall of the battery box, reducing the probability of contact between the battery cell and the bottom wall of the battery box.

[0090] In one embodiment, the step of obtaining the amount of glue to be applied to the sub-gluing area 101 according to the fitting plane α and the ideal plane β includes: calculating the volume of the area between the fitting plane α and the ideal plane β according to the fitting plane α and the ideal plane β; obtaining the mass of glue to be applied to the sub-gluing area 101 according to the volume of the area between the fitting plane α and the ideal plane β and the density of the colloid.

[0091] For the glue application equipment, controlling the glue application quality is easier and more accurate than controlling the glue application volume. Therefore, obtaining the mass of glue to be applied to the sub-gluing area 101 according to the volume of the area between the fitting plane α and the ideal plane β and the density of the colloid is beneficial to the precise control of the glue application equipment in step S04, keeping the error between the actual glue application amount and the calculated glue application amount of each sub-gluing area 101 small, keeping the glue layer surface of each sub-gluing area 101 having good flatness, and further keeping the entire glue layer surface of the bottom wall of the battery box having good flatness.

[0092] In one embodiment, in step S03, the step of calculating the amount of glue to be applied to each sub-gluing area 101 according to the flatness of each sub-gluing area 101 includes: obtaining a fitting formula according to the actual surface topography of the sub-gluing area 101, and calculating the volume of the area between the actual surface of the sub-gluing area 101 and the ideal plane by integral method, where the ideal plane is higher than the highest point of the bottom wall of the battery box; obtaining the mass of glue to be applied to the sub-gluing area 101 according to the volume of the area between the actual surface of the sub-gluing area 101 and the ideal plane and the density of the colloid.

[0093] The mass of the glue to be applied to the sub-gluing area 101 is obtained in the above manner. The calculation method is simple and accurate, which realizes adjusting the glue application amount according to the actual concave-convex conditions of each sub-gluing area 101, keeps the surface of the glue layer in each sub-gluing area 101 having good flatness, and further keeps the entire surface of the glue layer on the bottom wall of the battery box having good flatness.

[0094] In one embodiment, in step S04, the step of applying a corresponding amount of glue to each sub-gluing area 101 by using a glue application device according to the amount of glue to be applied to each sub-gluing area 101 includes: obtaining the glue output per unit time when the glue application device applies glue to each sub-gluing area 101 according to the mass of the glue to be applied to each sub-gluing area 101 and the glue application rhythm of the glue application device; wherein, the glue application rhythm of the glue application device is the glue application duration of the glue application device in each sub-gluing area 101; controlling the glue application device to apply glue to each sub-gluing area 101 according to the glue output per unit time when the glue application device applies glue to each sub-gluing area 101.

[0095] The glue output per unit time can also be understood as the glue spraying speed of the glue application device, such as the mass of the glue sprayed per unit time. Dividing the mass of the glue to be applied to each sub-gluing area 101 by the glue application rhythm of the glue application device, the glue output per unit time when the glue application device applies glue to the sub-gluing area 101 is obtained.

[0096] In the embodiment of the present application, the glue application to each sub-gluing area 101 is controlled according to the mass of the glue to be applied to each sub-gluing area and the glue application rhythm of the glue application device. While keeping the surface of the glue layer in each sub-gluing area 101 having good flatness, a high glue application efficiency is maintained, which is beneficial to the optimization and stable operation of the glue application process.

[0097] Optionally, the glue application duration of each sub-gluing area 101 is the same, which is beneficial to simplifying the control process of the glue application process, does not require frequently adjusting the glue application time parameters for different sub-gluing areas 101, and reduces the complexity of the process setting and the probability of errors.

[0098] In one embodiment, the step of controlling the glue application device to apply glue to each sub-glue application area 101 according to the glue output per unit time when the glue application device applies glue to each sub-glue application area 101 includes: dividing a plurality of sub-glue application areas 101 into multiple groups according to the different glue output per unit time when the glue application device applies glue to each sub-glue application area 101; wherein, the glue output per unit time corresponding to the sub-glue application areas 101 in the same group is the same; and applying glue to the sub-glue application areas 101 of multiple groups in sequence according to the descending order of the glue output per unit time. It should be noted that the glue output per unit time corresponding to the sub-glue application areas 101 in the same group does not have to be absolutely the same. It can be that the glue output per unit time corresponding to each sub-glue application area 101 in the same group is within a threshold range, or the difference between the glue output per unit time corresponding to each sub-glue application area 101 in the same group is less than a preset threshold. For example, the preset threshold can be that the difference fluctuates between 0.1% and 2%.

[0099] In the embodiment of the present application, by applying glue to the sub-glue application areas 101 of multiple groups in sequence according to the descending order of the glue output per unit time, the glue application trajectory is optimized. Since the stacking height of the colloid in the sub-glue application area 101 with a large glue output is usually large, when the glue application to the sub-glue application area 101 with a small glue output ends, there is a longer time for the colloid in the sub-glue application area 101 with a large glue output to spread under the action of gravity. During the process of the battery cells being grouped and put into the box, it is beneficial to make the surfaces between the respective sub-glue application areas 101 tend to be on the same plane, and it is easier for the battery cell module to come into contact with the colloids in multiple sub-glue application areas 101 simultaneously.

[0100] It can be understood that if the glue output per unit time of two adjacent sub-glue application areas 101 is different, it is necessary to adjust the spraying speed of the glue application device. In the prior art, usually, the glue is applied to each sub-glue application area 101 in sequence along the row and column directions, and it is necessary to frequently adjust the spraying speed of the glue application device; thus, due to the frequent adjustment of the spraying speed of the glue application device, there will be a precision difference in the spraying speed, which is likely to cause uneven glue application. Compared with applying glue to each sub-glue application area 101 in sequence along the row and column directions, applying glue in the descending order of the glue output can reduce the number of times of adjusting the spraying speed of the glue application device, making the glue application more uniform.

[0101] In one embodiment, the method for preparing the battery device further includes: providing an elastic insulating layer 33 on the bottom wall of the battery box.

[0102] When the battery cell module is not installed in the battery box, the surface of the elastic insulating layer 33 facing away from the bottom wall of the battery box is higher than the ideal plane of the adhesive layer on the bottom wall of the battery box. When the battery cell module is installed in the battery box and the battery cell module is pressed, the battery cell module comes into contact with the elastic insulating layer 33, and the elastic insulating layer 33 is compressed. After the force is removed and the elastic insulating layer 33 rebounds, the surface of the elastic insulating layer 33 facing away from the bottom wall of the battery box is basically flush with the ideal plane. Here, "basically flush" means that the height difference between the surface of the elastic insulating layer 33 facing away from the bottom wall of the battery box and the ideal plane is less than 1% - 5% of the height of the ideal plane.

[0103] By providing the elastic insulating layer 33 on the bottom wall of the battery box, when the battery cell module is pressed, the battery cell module comes into contact with the elastic insulating layer 33, and the elastic insulating layer 33 plays a role in buffering the battery cell, reducing the deformation of the bottom wall of the battery box caused by the extrusion of the battery cell. After the force is removed, the bottom wall of the battery box basically does not rebound, reducing the occurrence of the dendritic problem of the adhesive layer caused by the pulling of the adhesive layer due to the rebound of the bottom wall of the battery box after the force is removed.

[0104] In one embodiment, the step of providing the elastic insulating layer 33 on the bottom wall of the battery box is performed before the step of collecting the topographic image of the bottom wall of the battery box; the gluing area 10 is located in an area outside the elastic insulating layer 33.

[0105] The gluing area 10 being located in an area outside the elastic insulating layer 33 can be understood as: the orthographic projection of the gluing area 10 on the bottom wall of the battery box is misaligned with the orthographic projection of the elastic insulating layer 33 on the bottom wall of the battery box. That is, the elastic insulating layer 33 is provided in the non - gluing area around the gluing area 10.

[0106] By providing the elastic insulating layer 33 on the bottom wall of the battery box before collecting the topographic image of the bottom wall of the battery box, the area on the bottom wall of the battery box that needs to be glued can be accurately identified, reducing the probability of coating the adhesive layer in the area where the elastic insulating layer 33 is provided, and reducing the need for debonding the area where the elastic insulating layer 33 is provided or providing the elastic insulating layer 33 on the surface of the adhesive layer. This enables the elastic insulating layer 33 to achieve a good buffering effect while maintaining good adhesion between the battery cell and the bottom wall of the battery box, reducing the occurrence of the dendritic problem of the adhesive layer caused by the pulling of the adhesive layer on the bottom wall of the battery box after the force is removed.

[0107] In one embodiment, the step of providing the elastic insulating layer 33 on the bottom wall of the battery box can also be performed after the step of coating the corresponding amount of glue in each sub - gluing area 101 using a gluing device, as long as the elastic insulating layer 33 can achieve a buffering effect and can reduce the dendritic problem of the adhesive layer caused by the pulling of the adhesive layer on the bottom wall of the battery box.

[0108] In one embodiment, the elastic insulating layer 33 includes two elastic insulating strips 331. One elastic insulating strip 331 is disposed on one side of the glue application area 10, and the other elastic insulating strip 331 is disposed at an interval on the opposite side of the glue application area 10.

[0109] By arranging the elastic insulating layer 33 as described above, elastic insulating strips 331 are provided on both opposite sides of the glue application area 10. Both of the two elastic insulating strips 331 play a buffering role. After pressing the battery cell to unload the force, the occurrence of the dendritic problem of the glue layer at various positions on the bottom wall of the battery box caused by pulling is reduced.

[0110] In one embodiment, in the step of coating the corresponding amount of glue on each sub-glue application area 101 by using a glue coating device according to the amount of glue required for each sub-glue application area 101, the top surface of the glue is higher than the top surface of the elastic insulating layer 33.

[0111] The top surface of the glue refers to the surface of the glue facing away from the bottom wall of the battery box. The top surface of the elastic insulating layer 33 refers to the surface of the elastic insulating layer 33 facing away from the bottom wall of the battery box. Since the coated glue initially accumulates in a lump rather than being directly and evenly spread on each sub-glue application area 101, the top surface of the glue is higher than the top surface of the elastic insulating layer 33. After the battery cell module is put into the box, the glue is extruded to form a flat glue layer. At this time, the surface of the glue layer facing away from the bottom wall of the battery box is the preset ideal plane β.

[0112] By setting the glue coating device to coat the corresponding amount of glue on each sub-glue application area 101, with the top surface of the glue higher than the top surface of the elastic insulating layer 33, during the process of putting the battery cell module into the box, the battery cell module first contacts and extrudes the glue, and then contacts and extrudes the elastic insulating layer 33. Among them, when the battery cell module is put into the box and extrudes the glue, the glue is compressed to the height of the ideal plane, and the glue fills the entire sub-glue application area. After the force for extruding the battery cell module is removed, the elastic insulating layer 33 partially rebounds to play a pressure relief role.

[0113] In one embodiment, the elastic insulating layer 33 covers 5%-10% of the bottom wall area of the battery box.

[0114] The area of the bottom wall of the battery box covered by the elastic insulating layer 33 can be 5%, 6%, 7%, 8%, 9%, 10%, etc., or it can also be a range composed of any two of the above values. For example, 5%-8%, 7%-9%, etc.

[0115] By setting the elastic insulating layer 33 to cover 5%-10% of the bottom wall area of the battery box, it can play a good buffering role, and achieve good reduction of the dendritic problem of the glue layer at various positions on the bottom wall of the battery box caused by pulling; at the same time, it makes the glue application area on the bottom wall of the battery box have a large enough area to keep the glue layer on the bottom wall of the battery box firmly fix the battery monomer module.

[0116] In one embodiment, the thickness of the elastic insulating layer 33 is 1 mm - 2 mm.

[0117] The thickness of the elastic insulating layer 33 is 1 mm - 2 mm, which is the thickness when the battery monomer module is not installed in the battery box. The thickness of the elastic insulating layer can 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, 2.0 mm, etc., or it can also be a range composed of any two of the above values, for example, 1 mm - 1.6 mm, 1.4 - 1.9 mm, etc.

[0118] By setting the thickness of the elastic insulating layer 33 as above, the thickness of the elastic insulating layer 33 is appropriate. The surface of the elastic insulating layer 33 facing away from the bottom wall of the battery box is lower than the surface of the glue layer (at this time, the glue layer is in the state before the battery monomer module is put into the box) facing away from the bottom wall of the battery box, maintaining the stability of the bonding and fixing between the glue layer and the battery monomer module; at the same time, after the battery monomer is put into the box, when pressing the battery monomer, the elastic insulating layer 33 located below the battery monomer is compressed and deformed by the force. The thickness setting of the elastic insulating layer 33 can provide sufficient deformation amount, which can buffer the deformation of the bottom wall of the battery box after the force is removed, and reduce the uneven glue application caused by the bottom wall of the battery box rebounding and pulling the glue layer.

[0119] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the preparation system of the battery device provided by the embodiment of the present application.

[0120] The embodiment of the present application also provides a preparation system of a battery device, including an image collector 21, an image processing circuit 22, a calculation circuit 23, a glue application device 24, and an assembly module 25. The image collector 21 is used to collect the topographic image of the bottom wall of the battery box, and the topographic image includes the glue application area. The image processing circuit 22 is used to divide the glue application area into multiple sub-glue application areas. The calculation circuit 23 is used to calculate the amount of glue to be applied to each sub-glue application area according to the flatness of each sub-glue application area. The glue application device 24 is used to apply the corresponding amount of glue to each sub-glue application area according to the amount of glue to be applied to each sub-glue application area. The assembly module 25 is used to set the elastic insulating layer on the bottom wall of the battery box.

[0121] By making the above settings for the preparation system of the battery device, the amount of glue applied can be adjusted according to the concave and convex conditions at different positions of the bottom wall of the battery box body, maintaining good flatness on the surface of the glue layer. Furthermore, after the battery cells are placed into the box, the consistency of the height of the glue layer between the battery cells and the bottom wall of the battery box body can be maintained.

[0122] It should be noted that the preparation system of the battery device provided in the embodiment of the present application can be prepared using the preparation method of the battery device provided in the above embodiment.

[0123] In one embodiment, the glue application device includes a control circuit and a glue application head. The control circuit is used to control the amount of glue applied and the glue application speed of the glue application head. The glue application head is used to apply glue to the bottom wall of the battery box body, and the glue application head can accurately apply the glue to the specified position according to the instructions of the control circuit.

[0124] In one embodiment, the assembly module includes a manipulator, and the manipulator is configured to automatically set the elastic insulating layer at a preset position on the bottom wall of the battery box body.

[0125] Please refer to Figures 5 to 8 , Figure 5 which is a schematic structural diagram of the battery device provided in the embodiment of the present application, Figure 6 which is a top view structural diagram of the bottom wall of the battery box body provided in the embodiment of the present application, Figure 7 is Figure 6 a cross-sectional schematic diagram along line A-A, Figure 8 is Figure 7 an enlarged structural schematic diagram of the B area shown.

[0126] The battery device 3 provided in the embodiment of the present application includes a battery box body 31, a plurality of battery cells 32, an elastic insulating layer 33, and a glue layer 34. The battery box body 31 includes a side wall 312a and a bottom wall 312b. The plurality of battery cells 32 are arranged inside the battery box body 31. The elastic insulating layer 33 is arranged between the plurality of battery cells 32 and the bottom wall 312b. The glue layer 34 is arranged between the plurality of battery cells 32 and the bottom wall 312b and is located in the area not covered by the elastic insulating layer 33.

[0127] The battery box body 31 forms a receiving cavity 310. The plurality of battery cells 32 are received in the receiving cavity 310. The battery box body 31 can play a role in protecting the battery cells 32 and also facilitates gathering the plurality of battery cells 32 together.

[0128] In some examples, the battery case 31 may include an upper case 311 and a lower case 312, wherein the upper case 311 covers the lower case 312, and the upper case 311 and the lower case 312 together define a receiving chamber 310 for receiving the battery cell 32. The lower case 312 includes a side wall 312a and a bottom wall 312b, wherein the side wall 312a is arranged around the entire circumference of the bottom wall 312b.

[0129] In some examples, the bottom wall 312b includes a bottom guard plate and a cooling plate. The bottom guard plate is located at the bottom layer and serves to protect the bottom of the battery cell, reduce the impact and scratching of the battery cell by external objects, and also has a certain degree of heat insulation and moisture-proof effect. The water-cooling plate is located on the side of the bottom guard plate close to the battery cell 32 and is an important part of the thermal management system of the battery pack. The main function of the water-cooling plate is to remove the heat generated by the battery cell during the charging and discharging process through circulating coolant to ensure that the battery cell is in a suitable operating temperature range and improve the performance and life of the battery.

[0130] The shape of the battery case 31 can be specifically set as needed; for example, the shape of the battery case 31 can be cylindrical, and the corresponding battery device 3 can be called a round battery; for another example, the shape of the battery case 31 can be rectangular, and the corresponding battery device 3 can be called a rectangular battery.

[0131] In the battery device 3, the battery cell 32 refers to the smallest unit constituting the battery device 3. There can be multiple battery cells 32, and the multiple battery cells 32 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 32 are both connected in series and in parallel. The multiple battery cells 32 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 32 is accommodated in the battery box 31; of course, it is also possible that the multiple battery cells 32 are first connected in series, in parallel, or in mixed connection to form a battery module, and the multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the battery box 31.

[0132] Each battery cell 32 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 32 may be cylindrical, flat, rectangular, or in other shapes.

[0133] In an embodiment of the present application, an adhesive layer 34 is provided between the battery cell 32 and the bottom wall 312b. The adhesive layer 34 fixes the battery cell 32 and the bottom wall 312b, reducing the shaking or displacement of the battery cell 32 within the battery box 31. By providing the adhesive layer 34 between the battery cell 32 and the bottom wall 312b, when pressing the battery cell module, the battery cell 32 contacts the elastic insulating layer 33. After the force is removed, the elastic insulating layer 33 plays a buffering role, and the bottom wall 312b of the battery box 31 basically does not rebound, reducing the occurrence of the dendritic problem of the adhesive layer caused by the pulling of the adhesive layer on the bottom wall 312b of the battery box 31 after the force is removed.

[0134] In one embodiment, the elastic insulating layer 33 includes two elastic insulating strips 331. One elastic insulating strip 331 is disposed on one side of the adhesive layer 34, and the other elastic insulating strip 331 is disposed on the opposite side of the adhesive layer 34.

[0135] By arranging the elastic insulating layer 33 as described above, elastic insulating strips 331 are provided on both opposite sides of the adhesive layer 34, and both elastic insulating strips 331 play a buffering role. After pressing the battery cell 32 and removing the force, the occurrence of the dendritic problem of the adhesive layer 34 at various positions on the bottom wall 312b of the battery box 31 caused by pulling is reduced.

[0136] Optionally, the elastic insulating strip 331 extends in a straight line.

[0137] Optionally, along the extending direction of the elastic insulating strip 331, the end face of the elastic insulating strip 331 is flush with the end face of the adhesive layer 34; in other words, the length of the elastic insulating strip 331 is the same as the length of the adhesive layer 34. By the above arrangement, the elastic insulating strip 331 can achieve a good buffering effect.

[0138] In one embodiment, the elastic insulating layer 33 covers 5%-10% of the area of the bottom wall 312b.

[0139] The area of the bottom wall 312b of the battery box 31 covered by the elastic insulating layer 33 can be 5%, 6%, 7%, 8%, 9%, 10%, etc., or it can also be a range composed of any two of the above values. For example, 5%-8%, 7%-9%, etc.

[0140] By setting the elastic insulating layer 33 to cover 5%-10% of the area of the bottom wall 312b of the battery box 31, it can play a good buffering role, achieving a good reduction in the occurrence of the dendritic problem of the adhesive layer 34 at various positions on the bottom wall 312b of the battery box 31 caused by pulling; at the same time, it enables the adhesive layer 34 on the bottom wall 312b of the battery box 31 to have a sufficiently large setting area, maintaining the ability of the adhesive layer 34 on the bottom wall 312b of the battery box 31 to firmly fix the battery cell 32.

[0141] In one embodiment, the thickness of the elastic insulating layer 33 is 0.3 mm-1 mm.

[0142] The thickness of the elastic insulating layer 33 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc., or can be a range of any two of the above values, for example, 0.3mm-0.8mm, 0.5-1.0mm, etc. The thickness of the elastic insulating layer 33 is 0.3mm-1mm, which is the thickness of the battery cell module after it is put into the box. It should be noted that when the battery device is disassembled and the battery cell module is removed from the battery box 31, the elastic insulating layer 33 gradually returns to its original thickness of 1mm-2mm.

[0143] By setting the thickness of the elastic insulating layer 33 as above, the thickness of the elastic insulating layer 33 is appropriate, which can maintain the stability of the bonding and fixing between the glue layer 34 and the battery cell 32; at the same time, the problem of glue dendrites in the glue layer 34 is reduced.

[0144] In one embodiment, the bottom surface of the elastic insulating layer 33 is disposed in contact with the bottom wall 312 b , and the top surface of the elastic insulating layer 33 is disposed in contact with the bottom surface of the battery cell 32 .

[0145] The bottom surface of the elastic insulating layer 33 is the surface of the elastic insulating layer 33 close to the bottom wall 312b, and the bottom surface of the elastic insulating layer 33 contacts the water cooling plate of the bottom wall 312b. The top surface of the elastic insulating layer 33 is the surface of the elastic insulating layer 33 close to the battery cell 32, and the top surface of the elastic insulating layer 33 contacts the bottom wall of the housing 322 (e.g., aluminum housing) of the battery cell 32.

[0146] By setting the two opposite surfaces of the elastic insulating layer 33 to contact the bottom wall 312b and the bottom surface of the battery cell 32 respectively, a buffering effect can be well achieved, thereby effectively reducing the occurrence of tree-like problems of the glue layer 34 caused by pulling at various positions of the glue layer 34 on the bottom wall 312b of the battery box 31.

[0147] In one embodiment, the elastic insulating layer 33 is a foam layer.

[0148] By setting the elastic insulating layer 33 as a foam layer, the foam layer has certain compressibility and resilience deformation ability, can effectively absorb and disperse the impact force, buffer the deformation of the bottom wall 312b after the force is unloaded, and effectively reduce the occurrence of the dendrite problem of the glue layer 34 caused by the pulling of the glue layer 34 at various positions of the bottom wall 312b of the battery box 31. In addition, the foam layer has a certain adhesive force, which can keep the battery cell 32 and the bottom wall 312b relatively fixed, and reduce the displacement or shaking of the battery cell 32 located above the foam layer.

[0149] See also Figure 9, Figure 9 It is a schematic exploded view of a battery cell provided by an embodiment of the present application.

[0150] The battery cell 32 includes an end cap 321, a housing 322, a battery core assembly 323, and other functional components.

[0151] The end cap 321 refers to a component that covers the opening of the housing 322 to isolate the internal environment of the battery cell 32 from the external environment. Without limitation, the shape of the end cap 321 can be adapted to the shape of the housing 322 to cooperate with the housing 322. Optionally, the end cap 321 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 321 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 32 to have higher structural strength and improved stability.

[0152] Functional components such as electrode terminals 321a can be provided on the end cap 321. The electrode terminals 321a can be used to electrically connect to the battery core assembly 323 for outputting or inputting the electrical energy of the battery cell 32. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 32 reaches a threshold can also be provided on the end cap 321.

[0153] The material of the end cap 321 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0154] In some embodiments, an insulating member can also be provided on the inner side of the end cap 321. The insulating member can be used to isolate the electrical connection components inside the housing 322 from the end cap 321 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0155] The housing 322 is a component for cooperating with the end cap 321 to form the internal environment of the battery cell 32. Among them, the formed internal environment can be used to accommodate the battery core assembly 323, electrolyte, and other components. The housing 322 and the end cap 321 can be independent components. An opening can be provided on the housing 322, and the end cap 321 is covered at the opening to form the internal environment of the battery cell 32. Without limitation, the end cap 321 and the housing 322 can also be integrated. Specifically, the end cap 321 and the housing 322 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 322, the end cap 321 is then covered on the housing 322. The housing 322 can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 322 can be determined according to the specific shape and size of the battery core assembly 323. The material of the housing 322 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0156] The battery cell assembly 323 is the component in the battery cell 32 where the electrochemical reaction occurs. One or more battery cell assemblies 323 may be included within the housing 322. The battery cell assembly 323 includes a positive electrode tab, a negative electrode tab, and a separator located between the positive electrode tab and the negative electrode tab. The positive electrode tab and the negative electrode tab are wound or stacked to form the battery cell assembly 323. The portions of the positive electrode tab and the negative electrode tab having active materials constitute the main body of the battery cell assembly 323, and the portions of the positive electrode tab and the negative electrode tab without active materials respectively constitute the electrode ears. The positive electrode ear and the negative electrode ear may be commonly located at one end of the main body or respectively located at both ends of the main body. During the charging and discharging process of the battery device 3, the positive active material and the negative active material react with the electrolyte, and the electrode ears are connected to the electrode terminal 321a to form a current loop.

[0157] The battery device disclosed in the embodiments of the present application can be used in electronic devices that use a battery as a power source. The electronic device can be an electrical device that uses a battery as a power source or various energy storage systems that use a battery as an energy storage element. The electrical device includes a device main body and the battery device provided in the above embodiments, and the battery device is disposed in the device main body. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0158] For the convenience of description in the following embodiments, a vehicle 40, which is an electronic device according to an embodiment of the present application, is taken as an example for description. Please refer to Figure 10 , Figure 10 which is a schematic structural diagram of the vehicle provided by the embodiments of the present application.

[0159] The vehicle 40 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. The battery device 3 is disposed inside the vehicle 40, and the battery device 3 may be disposed at the bottom, the head, or the tail of the vehicle 40. The battery device 3 can be used for power supply of the vehicle 40. For example, the battery device 3 can be used as the operating power source of the vehicle 40. The vehicle 40 may further include a controller 401 and a motor 402. The controller 401 is used to control the battery device 3 to supply power to the motor 402, for example, for the working power requirements during the start, navigation, and driving of the vehicle 40.

[0160] In some embodiments of the present application, the battery device 3 can not only be used as the operating power source of the vehicle 40, but also be used as the driving power source of the vehicle 40, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 40.

[0161] The above are only the implementation manners of this application, and do not thus limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall similarly be included in the patent protection scope of this application.

Claims

1. A method for preparing a battery device, characterized in that, Including: Collecting a topographic image of the bottom wall of the battery box; the topographic image includes a gluing area; Dividing the gluing area into a plurality of sub-gluing areas; Calculating the amount of glue to be applied to each sub-gluing area according to the flatness of each sub-gluing area; According to the amount of glue to be applied to each sub-gluing area, using a gluing device to apply a corresponding amount of glue to each sub-gluing area; The method for preparing the battery device further includes: Providing an elastic insulating layer on the bottom wall of the battery box; the gluing area is located in an area outside the elastic insulating layer; Wherein, the step of calculating the amount of glue to be applied to each sub-gluing area according to the flatness of each sub-gluing area includes: Obtaining a fitting plane according to the flatness of the sub-gluing area; Obtaining the amount of glue to be applied to the sub-gluing area according to the fitting plane and the ideal plane; wherein, the ideal plane is the top surface of a preset glue layer; In the step of using a gluing device to apply a corresponding amount of glue to each sub-gluing area according to the amount of glue to be applied to each sub-gluing area, the top surface of the glue is higher than the top surface of the elastic insulating layer.

2. The method for preparing a battery device according to claim 1, wherein The step of dividing the gluing area into a plurality of sub-gluing areas includes: Dividing the gluing area into a plurality of sub-gluing areas with the same area.

3. The method for preparing a battery device according to claim 1, wherein The step of obtaining the amount of glue to be applied to the sub-gluing area according to the fitting plane and the ideal plane includes: Calculating the volume of the area between the fitting plane and the ideal plane according to the fitting plane and the ideal plane; Obtaining the mass of glue to be applied to the sub-gluing area according to the volume of the area between the fitting plane and the ideal plane and the density of the glue.

4. The method for preparing a battery device according to claim 3, wherein The step of using a gluing device to apply a corresponding amount of glue to each sub-gluing area according to the amount of glue to be applied to each sub-gluing area includes: Obtaining the glue output per unit time when the gluing device applies glue to each sub-gluing area according to the mass of glue to be applied to each sub-gluing area and the gluing rhythm of the gluing device; wherein, the gluing rhythm of the gluing device is the gluing duration of the gluing device in each sub-gluing area; Controlling the gluing device to apply glue to each sub-gluing area according to the glue output per unit time when the gluing device applies glue to each sub-gluing area.

5. The method for preparing a battery device according to claim 4, wherein The step of controlling the gluing device to apply glue to each sub-gluing area according to the glue output per unit time when the gluing device applies glue to each sub-gluing area includes: Dividing the plurality of sub-gluing areas into a plurality of groups according to the difference in the glue output per unit time when the gluing device applies glue to each sub-gluing area; wherein, the glue output per unit time corresponding to the sub-gluing areas in the same group is the same; The sub-coating areas of multiple groups are coated in sequence according to the amount of glue output per unit time from high to low.

6. The method for preparing a battery device according to claim 1, wherein the step of providing an elastic insulating layer on the bottom wall of the battery box body is carried out before the step of collecting the topographic image of the bottom wall of the battery box body.

7. The method for preparing a battery device according to claim 6, wherein the elastic insulating layer comprises two elastic insulating strips; one of the elastic insulating strips is arranged on one side of the coating area, and the other elastic insulating strip is arranged at an interval on the opposite side of the coating area.

8. The method for preparing a battery device according to claim 1, wherein the elastic insulating layer covers 5%-10% of the area of the bottom wall of the battery box body.

9. The method for preparing a battery device according to claim 1, wherein the thickness of the elastic insulating layer is 1 mm - 2 mm.

10. A preparation system for a battery device, characterized in that, Comprising: An assembly module for providing an elastic insulating layer on the bottom wall of the battery box body; An image collector for collecting the topographic image of the bottom wall of the battery box body; The topographic image comprises a coating area; An image processing circuit for dividing the coating area into multiple sub-coating areas; A calculation circuit for obtaining a fitting plane according to the flatness of the sub-coating area, and obtaining the amount of glue to be coated in the sub-coating area according to the fitting plane and an ideal plane; wherein, the ideal plane is the top surface of a preset glue layer; A glue coating device for coating a corresponding amount of glue in each sub-coating area according to the amount of glue to be coated in each sub-coating area, and the top surface of the glue is higher than the top surface of the elastic insulating layer.

11. A battery device prepared by the method for preparing a battery device according to any one of claims 1-9, characterized in that, Comprising: A battery box body comprising a side wall and a bottom wall; Multiple battery cells arranged in the battery box body; An elastic insulating layer arranged between the multiple battery cells and the bottom wall; A glue layer arranged between the multiple battery cells and the bottom wall and located in an area not covered by the elastic insulating layer.

12. The battery device according to claim 11, wherein the elastic insulating layer comprises two elastic insulating strips; one of the elastic insulating strips is arranged on one side of the glue layer, and the other elastic insulating strip is arranged on the opposite side of the glue layer.

13. The battery device according to claim 11, wherein the elastic insulating layer covers 5%-10% of the area of the bottom wall.

14. The battery device according to claim 11, wherein the thickness of the elastic insulating layer is 0.3 mm - 1 mm.

15. The battery device according to any one of claims 11 - 14, wherein the bottom surface of the elastic insulating layer is in contact with the bottom wall, and the top surface of the elastic insulating layer is in contact with the bottom surface of the battery cell.

16. The battery device according to any one of claims 11 - 14, wherein the elastic insulating layer is a foam layer.

17. An electronic device, characterized in that, Comprising: The battery device according to any one of claims 11 - 16.

Images