Preparation method and system of battery device, battery device and electronic equipment

Abstract

The invention provides a preparation method and system of a battery device, the battery device and electronic equipment. The preparation method of the battery device comprises the following steps: acquiring a morphology image of the bottom wall of a battery box body; the morphology image comprises a gluing area; dividing the gluing area into a plurality of sub-gluing areas; according to the flatness of each sub-gluing area, the amount of glue needing to be glued in each sub-gluing area is calculated; and according to the required gluing amount of each sub-gluing area, gluing equipment is adopted to coat each sub-gluing area with the corresponding gluing amount of glue. By means of the arrangement, the gluing amount can be adjusted according to the concave-convex conditions of different positions of the bottom wall of the battery box body, and the good flatness of the surface of a gluing glue layer is kept.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and specifically to a method and system for preparing a battery device, a battery device, and an electronic device. Background Art

[0002] As a new generation of energy storage and conversion devices, batteries are widely used in portable electronic devices, electric vehicles and other fields. As the core component of electric vehicles, the safety performance of batteries is very important.

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

[0004] However, the flatness of the bottom wall of the battery box is currently poor, and the flatness of the glue layer formed by coating the bottom wall of the box with glue is poor, and the consistency of the thickness of the glue layer cannot be guaranteed. Summary of the invention

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

[0006] In order to solve the above technical problems, the first aspect of the present application provides a method for preparing a battery device, including: collecting a topographic image of the bottom wall of a battery case; the topographic image includes a glue-coated area; dividing the glue-coated area into a plurality of sub-glue-coated areas; calculating the amount of glue required for each sub-glue-coated area according to the flatness of each sub-glue-coated area; and using a glue-coating device to apply a corresponding amount of glue to each sub-glue-coated area according to the amount of glue required for each sub-glue-coated area. The method for preparing the battery device also includes: setting an elastic insulating layer on the bottom wall of the battery case; the glue-coated area is located outside the elastic insulating layer.

[0007] By applying glue to the bottom wall of the battery box using the above-mentioned gluing method provided in the embodiment of the present application, the amount of glue applied can be adjusted according to the unevenness of different positions of the bottom wall of the battery box, thereby maintaining good flatness of the surface of the glue layer after the battery cell is put into the box, and maintaining consistency in the height of the glue layer between the battery cell and the bottom wall of the battery box.

[0008] By arranging an elastic insulating layer on the bottom wall of the battery case, when the battery cell module is pressed, the battery cell module contacts the elastic insulating layer, and the elastic insulating layer plays a role of buffering the battery cells, reducing the deformation of the bottom wall of the battery case caused by the extrusion of the battery cells. After unloading, the bottom wall of the battery case basically does not rebound, reducing the occurrence of the problem of glue layer dendrites caused by the pulling of the glue layer due to the rebound of the bottom wall of the battery case after unloading.

[0009] In one embodiment, the step of dividing the glue coating area into a plurality of sub-glue coating areas includes: dividing the glue coating area into a plurality of sub-glue coating areas of the same area.

[0010] By dividing the glue coating area into a plurality of sub-glue coating areas with the same area, the division method is simple and easy to operate, and the complexity caused by the area difference of the sub-glue coating areas is reduced.

[0011] In one embodiment, the step of calculating the amount of glue required for each sub-glue coating area based on the flatness of each sub-glue coating area includes: obtaining a fitting plane based on the flatness of the sub-glue coating area; obtaining the amount of glue required for the sub-glue coating area based on the fitting plane and the ideal plane; wherein the ideal plane is the top surface of a preset glue layer.

[0012] The fitting plane is obtained by fitting the flatness of the sub-gluing area, and the amount of glue required in the sub-gluing area is calculated based on the fitting plane and the ideal plane. The calculation method is simple and accurate, and the amount of glue is adjusted according to the actual concave and convex conditions of each sub-gluing area, so as to maintain the good flatness of the glue layer surface of each sub-gluing area, thereby maintaining the good flatness of the entire glue layer surface of the bottom wall of the battery box.

[0013] In one embodiment, the step of obtaining the amount of glue required for the sub-glue coating area based on the fitting plane and the ideal plane includes: calculating the volume of the area between the fitting plane and the ideal plane based on the fitting plane and the ideal plane; and obtaining the mass of glue required for the sub-glue coating area based on the volume of the area between the fitting plane and the ideal plane and the density of the colloid.

[0014] For the glue coating equipment, it is easier and more accurate to control the glue coating quality than to control the glue coating volume. Therefore, the mass of glue required in the sub-glue coating area is obtained according to the volume of the area between the fitting plane and the ideal plane and the density of the colloid, which is conducive to the precise control of the glue coating equipment, keeping the error between the actual glue coating amount and the calculated glue coating amount of each sub-glue coating area small, keeping the glue layer surface of each sub-glue coating area with good flatness, and thus keeping the entire glue layer surface of the bottom wall of the battery box with good flatness.

[0015] In one embodiment, according to the amount of glue required to be applied to each sub-gluing area, a step of applying a corresponding amount of glue to each sub-gluing area using a glue coating device includes: determining the amount of glue output per unit time when the glue coating device is coating each sub-gluing area according to the quality of glue required to be coated on each sub-gluing area and the glue coating rhythm of the glue coating device; wherein the glue coating rhythm of the glue coating device is the length of time the glue coating device is coating each sub-gluing area; and controlling the glue coating device to coat each sub-gluing area according to the amount of glue output per unit time when the glue coating device is coating each sub-gluing area.

[0016] The embodiment of the present application controls the gluing of each sub-gluing area according to the quality of glue required in each sub-gluing area and the gluing rhythm of the gluing equipment. While maintaining good flatness on the surface of the glue layer of each sub-gluing area, it maintains a high gluing efficiency, which is beneficial to the optimization and stable operation of the gluing process.

[0017] In one embodiment, the step of controlling the glue coating device to coat each sub-gluing area with glue according to the amount of glue output per unit time when the glue coating device coats each sub-gluing area with glue includes: dividing multiple sub-gluing areas into multiple groups according to the different amounts of glue output per unit time when the glue coating device coats each sub-gluing area with glue; wherein the amounts of glue output per unit time corresponding to the sub-gluing areas in the same group are the same; and coating the sub-gluing areas of the multiple groups in order of the amount of glue output per unit time.

[0018] The embodiment of the present application optimizes the gluing trajectory by applying glue to the sub-gluing areas of multiple groups in order of the glue output per unit time. Since the stacking height of the colloid in the sub-gluing area with a large amount of glue is usually large, when the gluing of the sub-gluing area with a small amount of glue is completed, there is more time for the colloid in the sub-gluing area with a large amount of glue to spread out under the action of gravity. In the process of grouping battery cells into boxes, it is beneficial to make the surfaces between the sub-gluing areas tend to be located in the same plane, and the battery cell module is more likely to contact the colloid in multiple sub-gluing areas at the same time.

[0019] In one embodiment, the step of providing an elastic insulating layer on the bottom wall of the battery case is performed before the step of acquiring a topographic image of the bottom wall of the battery case; the glue coating area is located outside the elastic insulating layer.

[0020] By setting an elastic insulating layer on the bottom wall of the battery case before collecting the topographic image of the bottom wall of the battery case, the area on the bottom wall of the battery case that needs to be coated with glue can be accurately identified, reducing the probability of coating the glue layer in the area where the elastic insulating layer is set, and reducing the glue removal operation in the area where the elastic insulating layer is set. Maintaining the elastic insulating layer can achieve a good buffering effect, and reduce the occurrence of glue layer tree-like problems caused by pulling of the glue layer on the bottom wall of the battery case after unloading.

[0021] In one embodiment, the elastic insulating layer includes two elastic insulating strips; one elastic insulating strip is arranged on one side of the glue-coated area, and the other elastic insulating strip is arranged at a distance on the other side opposite to the glue-coated area.

[0022] By performing the above-mentioned setting on the elastic insulating layer, elastic insulating strips are arranged on the opposite sides of the glue-coated area, and the two elastic insulating strips both play a buffering role. After the battery cell is pressed to unload the force, the occurrence of the glue layer dendrite problem caused by pulling at various positions of the glue layer on the bottom wall of the battery box is reduced.

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

[0024] By setting up a glue coating device to coat a corresponding amount of glue in each sub-glue coating area, the top surface of the colloid is higher than the top surface of the elastic insulating layer. When the battery cell module is put into the box, it first contacts and squeezes the colloid, and then contacts and squeezes the elastic insulating layer. Among them, the squeezed colloid after the battery cell module is put into the box makes the colloid be compressed to the height of the ideal plane, and the colloid fills the entire sub-glue coating area. After the force squeezing the battery cell module is removed, the elastic insulating layer partially rebounds, which plays a role in pressure relief.

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

[0026] By setting an elastic insulating layer to cover 5%-10% of the bottom wall area of ​​the battery case, a good buffering effect can be achieved, which can effectively reduce the occurrence of glue layer dendrite problems caused by pulling of the glue layer at various positions on the bottom wall of the battery case; at the same time, the glue coating area of ​​the bottom wall of the battery case has a large enough area to keep the glue layer on the bottom wall of the battery case firmly fixed to the battery cell module.

[0027] In one embodiment, the thickness of the elastic insulating layer is 1 mm to 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 fixation between the adhesive layer and the battery cell module; at the same time, after the battery cell is put into the box, the battery cell is pressed, and the elastic insulating layer under the battery cell is compressed and deformed by force. The thickness setting of the elastic insulating layer can provide sufficient deformation, which can buffer the deformation of the bottom wall of the battery box after unloading, and reduce the uneven glue coating caused by the rebound of the bottom wall of the battery box pulling the adhesive layer.

[0029] In a second aspect of the present application, a preparation system for a battery device is provided, comprising an assembly module, an image collector, an image processing circuit, a computing circuit, and a gluing device; the assembly module is used to set an elastic insulating layer on the bottom wall of a battery case; the image collector is used to collect a topographic image of the bottom wall of the battery case; the topographic image includes a gluing area; the image processing circuit is used to divide the gluing area into a plurality of sub-gluing areas; the computing circuit is used to calculate the amount of glue required for each sub-gluing area according to the flatness of each sub-gluing area; the gluing device is used to apply a corresponding amount of colloid to each sub-gluing area according to the amount of glue required for each sub-gluing area.

[0030] By making the above-mentioned settings to the preparation system of the battery device, the amount of glue applied can be adjusted according to the unevenness of different positions of the bottom wall of the battery box, thereby maintaining good flatness of the surface of the glue layer, and further maintaining consistency in the height of the glue layer between the battery cell and the bottom wall of the battery box after the battery cell is placed in the box.

[0031] In a third aspect of the present application, a battery device is provided, comprising a battery case, a plurality of battery cells, an elastic insulating layer and a glue layer, wherein the battery case comprises a side wall and a bottom wall; the plurality of battery cells are arranged in the battery case; 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 an area not covered by the elastic insulating layer.

[0032] The embodiment of the present application sets a glue layer between the battery cell and the bottom wall, and the glue layer fixes the battery cell and the bottom wall, thereby reducing the shaking or displacement of the battery cell in the battery case; by setting the glue layer between the battery cell and the bottom wall, when the battery cell module is pressed, the battery cell contacts the elastic insulating layer, and after the force is unloaded, the elastic insulating layer plays a buffering role, and the bottom wall of the battery case basically does not rebound, thereby reducing the occurrence of the glue layer dendrite problem caused by the pulling of the glue layer on the bottom wall of the battery case after the force is unloaded.

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

[0034] By performing the above-mentioned arrangement on the elastic insulating layer, elastic insulating strips are arranged on opposite sides of the adhesive layer, and the two elastic insulating strips both play a buffering role. After the battery cell is pressed to unload the force, the occurrence of the adhesive layer dendrite problem caused by pulling at various positions of the adhesive layer on the bottom wall of the battery box is reduced.

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

[0036] By setting an elastic insulating layer to cover 5%-10% of the bottom wall area of ​​the battery case, a good buffering effect can be achieved, which can effectively reduce the occurrence of glue layer dendrite problems caused by pulling of the glue layer at various positions on the bottom wall of the battery case; at the same time, the glue layer on the bottom wall of the battery case has a sufficiently large setting area to ensure that the glue layer on the bottom wall of the battery case can firmly fix the battery cells.

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

[0038] By setting the thickness of the elastic insulating layer as above, 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 cell; at the same time, the problem of glue dendrites in the 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; 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; 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; Figure 4 is a structural schematic diagram of a battery device preparation system provided in an embodiment of the present application; Figure 5 is a schematic diagram of the structure of a battery device provided in an embodiment of the present application; Figure 6 is a schematic diagram of the top view of the bottom wall of the battery box provided in an embodiment of the present application; Figure 7 yes Figure 6 Schematic diagram of the cross section along line AA; Figure 8 yes Figure 7 A schematic diagram of the enlarged structure of region B is shown; Fig. 9 is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application; Fig.10 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application.

[0047] Description of reference numerals: Gluing area 10, sub-glueing area 101, fitting plane α, ideal plane β, image collector 21, image processing circuit 22, computing circuit 23, glue coating equipment 24, battery device 3, battery case 31, accommodating cavity 310, upper case 311, lower case 312, side wall 312a, bottom wall 312b, battery cell 32, end cover 321, electrode terminal 321a, shell 322, battery cell assembly 323, elastic insulating layer 33, elastic insulating strip 331, glue layer 34, vehicle 40, controller 401, motor 402. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The terms "first", "second", and "third" in this application are for descriptive purposes only 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" is at least two, such as two, three, etc., unless otherwise specifically 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, 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 may optionally further include unlisted steps or units, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0050] Reference to "embodiment" in this context means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment when it appears in various places in the specification, 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.

[0051] 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 may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0052] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "link", "fix", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. 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.

[0053] The battery includes a box body and a battery cell disposed inside the box body. Usually, glue is applied between the bottom wall of the box body and the battery cell to fix the battery cell and maintain electrical insulation between the box body and the battery cell to maintain a high safety of the battery.

[0054] At present, the bottom wall of the battery box usually 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 through FDS (Flow Drill Screw). The flatness of the bottom wall of the box is poor, and the flatness of the glue layer formed by gluing the bottom wall of the box is poor. It is not easy to maintain the consistency of the thickness of the glue layer after the battery cells are grouped into the box.

[0055] In view of this, the embodiments of the present application provide a method and system for preparing a battery device, a battery device, and an electronic device to maintain good flatness of the bottom wall glue coating of the battery case. Specifically, the embodiments of the present application design a method for gluing the bottom wall of the battery case, including: collecting a topographic image of the bottom wall of the battery case, the topographic image includes a glue coating area; dividing the glue coating area into a plurality of sub-glue coating areas; calculating the amount of glue required for each sub-glue coating area according to the flatness of each sub-glue coating area; according to the amount of glue required for each sub-glue coating area, using a gluing device to apply a corresponding amount of glue to each sub-glue coating area, so that the surface of the glue layer in the glue coating area away from the bottom wall of the battery case has good flatness. Among them, the good flatness of the surface of the glue layer away from the bottom wall of the battery case means that the surface of the glue layer of the bottom wall of the battery case away from the bottom wall is infinitely close to a plane.

[0056] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of a process for preparing a battery device provided in an embodiment of the present application, Figure 2 It is a schematic diagram of the top view of the bottom wall of the battery box provided in an embodiment of the present application.

[0057] The preparation method of the battery device provided in the embodiment of the present application specifically includes: Step S01: collecting a topographic image of the bottom wall of the battery box, wherein the topographic image includes a glue-coated area 10 .

[0058] In one embodiment, a CCD (Charge-Coupled Device) is used to scan the bottom wall of the battery box to obtain a topographic image of the bottom wall of the battery box. CCD scanning technology uses a CCD image sensor to convert an optical image into an electrical signal to generate a digital image. Optionally, during the scanning process, the bottom wall of the battery box needs to be properly illuminated to ensure that the features of the bottom wall surface of the battery box can be clearly captured by the CCD camera.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The glue coating area 10 is an area for setting a glue layer to bond the bottom wall of the battery case to the battery cell. In one embodiment, the center area of ​​the bottom wall of the battery case needs to be glued, and the center area of ​​the topographic image is the glue coating area 10. An annular non-glue coating area may also be set around the glue coating area 10.

[0064] Step S02: dividing the glue coating area 10 into a plurality of sub-glue coating areas 101 .

[0065] 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.

[0066] Step S03 : calculating the amount of glue required for each sub-glue coating area 101 according to the flatness of each sub-glue coating area 101 .

[0067] Step S04: according to the amount of glue required to be applied to each sub-glue application area 101 , a glue application device is used to apply a corresponding amount of glue to each sub-glue application area 101 .

[0068] By applying glue to the bottom wall of the battery box using the above-mentioned gluing method provided in the embodiment of the present application, the amount of glue applied can be adjusted according to the unevenness of different positions of the bottom wall of the battery box, thereby maintaining good flatness of the surface of the glue layer after the battery cell is put into the box, and maintaining consistency in the height of the glue layer between the battery cell and the bottom wall of the battery box.

[0069] In one embodiment, in step S02 , the step of dividing the glue-coated area 10 into a plurality of sub-glue-coated areas 101 includes: dividing the glue-coated area 10 into a plurality of sub-glue-coated areas 101 having the same area.

[0070] By dividing the glue-coated area 10 into a plurality of sub-glue-coated areas 101 with the same area, the division method is simple and easy to operate, thereby reducing the complexity caused by the area difference of the sub-glue-coated areas 101 .

[0071] Optionally, the plurality of sub-glue coating regions 101 have the same area and shape. Figure 2 As shown, the plurality of sub-glueing areas 101 divide the glueing area 10 into a grid shape.

[0072] Optional, such as Figure 2 As shown, the glue coating area 10 is rectangular, and the glue coating area 10 is divided into a plurality of square sub-glue coating areas 101 arranged in a two-dimensional array, and each sub-glue coating area 101 is a grid.

[0073] In one embodiment, see Figure 3 , 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. In step S03, the step of calculating the amount of glue required for each sub-glue coating area 101 according to the flatness of each sub-glue coating area 101 includes: obtaining a fitting plane α according to the flatness of the sub-glue coating area 101; obtaining the amount of glue required for the sub-glue coating area 101 according to the fitting plane α and the ideal plane β, wherein the ideal plane β is the top surface of the preset glue layer.

[0074] The amount of glue required to be applied to the sub-glue application area 101 may be the mass of glue required to be applied or the volume of glue required to be applied.

[0075] The top surface of the adhesive layer is the surface of the adhesive layer away from the bottom wall of the battery box. The preset top surface of the adhesive layer is a plane, which is parallel to and fits with the surface of the multiple battery cells close to the bottom wall of the battery box.

[0076] By fitting the flatness of the sub-glue coating area 101, a fitting plane α is obtained, and the amount of glue required for the sub-glue coating area 101 is calculated based on the fitting plane α and the ideal plane β. The calculation method is simple and accurate, and the glue amount is adjusted according to the actual convexity and concavity of each sub-glue coating area 101, so as to maintain the glue layer surface of each sub-glue coating area 101 with good flatness, thereby maintaining the entire glue layer surface of the bottom wall of the battery box with good flatness.

[0077] Optionally, the actual plane of each sub-gluing area 101 is fitted by the least square method to obtain the fitting plane α. The least square method is used for fitting, and the calculation process is relatively simple and easy to implement, and a stable and reliable fitting result can be obtained.

[0078] Optionally, the ideal plane β should be higher than the highest point of the bottom wall of the battery case, so that a glue layer is provided between the battery cell and the bottom wall of the battery case, thereby reducing the probability of contact between the battery cell and the bottom wall of the battery case.

[0079] In one embodiment, the step of obtaining the amount of glue required for the sub-glue coating 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 required for the sub-glue coating 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.

[0080] For the glue coating equipment, it is easier and more accurate to control the glue coating quality than to control the glue coating volume. Therefore, the mass of glue required for the sub-glue coating area 101 is obtained according to the volume of the area between the fitting plane α and the ideal plane β and the density of the colloid, which is beneficial to the precise control of the glue coating equipment when performing step S04, so as to keep the error between the actual glue coating amount and the calculated glue coating amount of each sub-glue coating area 101 small, keep the glue layer surface of each sub-glue coating area 101 with good flatness, and thus keep the entire glue layer surface of the bottom wall of the battery case with good flatness.

[0081] In one embodiment, in step S03, the step of calculating the amount of glue required for each sub-glue coating area 101 according to the flatness of each sub-glue coating area 101 includes: deriving a fitting formula according to the actual surface morphology of the sub-glue coating area 101, and calculating the volume of the area between the actual surface of the sub-glue coating area 101 and the ideal plane by an integral method, wherein the ideal plane is higher than the highest point of the bottom wall of the battery case; and obtaining the mass of glue required for the sub-glue coating area 101 according to the volume of the area between the actual surface of the sub-glue coating area 101 and the ideal plane and the density of the colloid.

[0082] The mass of glue to be applied to the sub-gluing area 101 is obtained in the above manner. The calculation method is simple and accurate, enabling the adjustment of the glue application amount according to the actual concave and convex conditions of each sub-gluing area 101, maintaining good flatness of the glue layer surface of each sub-gluing area 101, and thus maintaining good flatness of the entire glue layer surface of the bottom wall of the battery box body.

[0083] In an 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 of the glue application device when applying glue to each sub-gluing area 101 according to the mass of 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 of the glue application device when applying glue to each sub-gluing area 101.

[0084] The glue output per unit time can also be understood as the glue spraying speed of the glue application device, such as the glue spraying mass per unit time. Dividing the mass of glue to be applied to each sub-gluing area 101 by the glue application rhythm of the glue application device gives the glue output per unit time of the glue application device when applying glue to the sub-gluing area 101.

[0085] In the embodiment of the present application, the glue application to each sub-gluing area 101 is controlled according to the mass of glue to be applied to each sub-gluing area and the glue application rhythm of the glue application device. While maintaining good flatness of the glue layer surface of each sub-gluing area 101, a high glue application efficiency is maintained, which is beneficial to the optimization and stable operation of the glue application process.

[0086] 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, eliminating the need to frequently adjust the glue application time parameters for different sub-gluing areas 101, and reducing the complexity of process settings and the probability of errors.

[0087] In one embodiment, the step of controlling the glue coating device to coat each sub-coating area 101 with glue according to the glue output per unit time when the glue coating device coats each sub-coating area 101 with glue includes: dividing multiple sub-coating areas 101 into multiple groups according to the different glue output per unit time when the glue coating device coats each sub-coating area 101 with glue; wherein the glue output per unit time corresponding to the sub-coating areas 101 in the same group is the same; and coating the sub-coating areas 101 in the multiple groups in order of the glue output per unit time. It should be noted that the glue output per unit time corresponding to the sub-coating areas 101 in the same group may not be absolutely the same, and the glue output per unit time corresponding to each sub-coating area 101 in the same group may be within a threshold range, or the difference in the glue output per unit time corresponding to each sub-coating area 101 in the same group may be less than a preset threshold. For example, the preset threshold may be a difference fluctuating between 0.1% and 2%.

[0088] The embodiment of the present application optimizes the gluing trajectory by applying glue to the sub-gluing areas 101 of multiple groups in order of the glue output per unit time. Since the stacking height of the colloid in the sub-gluing area 101 with a large amount of glue is usually large, when the gluing of the sub-gluing area 101 with a small amount of glue is completed, there is a longer time for the colloid in the sub-gluing area 101 with a large amount of glue to spread out under the action of gravity. In the process of grouping battery cells into boxes, it is beneficial to make the surfaces between the sub-gluing areas 101 tend to be located in the same plane, and the battery cell module is more likely to contact the colloid in multiple sub-gluing areas 101 at the same time.

[0089] It can be understood that if the glue output per unit time of two adjacent sub-glue coating areas 101 is different, it is necessary to adjust the glue spraying speed of the glue coating equipment. In the prior art, each sub-glue coating area 101 is usually coated with glue in sequence along the row and column directions, and the glue spraying speed of the glue coating equipment needs to be adjusted frequently; in this way, the frequent adjustment of the glue spraying speed of the glue coating equipment will lead to differences in the accuracy of the glue spraying speed, which can easily lead to uneven glue coating. Compared with coating each sub-glue coating area 101 in sequence along the row and column directions, coating in the order of high and low glue output can reduce the number of times the glue spraying speed of the glue coating equipment is adjusted, making the glue coating more uniform.

[0090] In one embodiment, the method for preparing the battery device further includes: disposing an elastic insulating layer 33 on the bottom wall of the battery box.

[0091] When the battery cell module is not installed in the battery case, the surface of the elastic insulating layer 33 away from the bottom wall of the battery case is higher than the ideal plane of the glue layer of the bottom wall of the battery case. When the battery cell module is installed in the battery case, the battery cell module is pressed, the battery cell module contacts the elastic insulating layer 33, and the elastic insulating layer 33 is compressed. After the force is released, the elastic insulating layer 33 rebounds, and the surface of the elastic insulating layer 33 away from the bottom wall of the battery case is basically flush with the ideal plane. Wherein, basically flush means that the height difference between the surface of the elastic insulating layer 33 away from the bottom wall of the battery case and the ideal plane is less than 1%-5% of the height of the ideal plane.

[0092] By arranging an elastic insulating layer 33 on the bottom wall of the battery case, when the battery cell module is pressed, the battery cell module contacts the elastic insulating layer 33, and the elastic insulating layer 33 plays a role of buffering the battery cells, thereby reducing the deformation of the bottom wall of the battery case caused by the extrusion of the battery cells. After unloading, the bottom wall of the battery case basically does not rebound, thereby reducing the occurrence of the problem of glue layer dendrites caused by the pulling of the glue layer due to the rebound of the bottom wall of the battery case after unloading.

[0093] In one embodiment, the step of providing an elastic insulating layer 33 on the bottom wall of the battery case is performed before the step of collecting the topographic image of the bottom wall of the battery case; the glue coating area 10 is located outside the elastic insulating layer 33 .

[0094] The area where the glue-coated area 10 is located outside the elastic insulating layer 33 can be understood as: the orthographic projection of the glue-coated area 10 on the bottom wall of the battery box is staggered 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 arranged in the non-glue-coated area around the glue-coated area 10.

[0095] By setting an elastic insulating layer 33 on the bottom wall of the battery case before collecting the topographic image of the bottom wall of the battery case, the area of ​​the bottom wall of the battery case that needs to be coated with glue can be accurately identified, reducing the probability of coating the glue layer in the area where the elastic insulating layer 33 is set, and reducing the need to remove glue from the area where the elastic insulating layer 33 is set or to set the elastic insulating layer 33 on the surface of the glue layer. Maintaining the elastic insulating layer 33 can achieve a good buffering effect, while maintaining good adhesion between the battery cell and the bottom wall of the battery case, reducing the occurrence of glue layer dendrite problems caused by pulling of the glue layer on the bottom wall of the battery case after unloading.

[0096] In one embodiment, the step of providing an elastic insulating layer 33 on the bottom wall of the battery case can also be performed after the step of applying a corresponding amount of colloid in each sub-glue coating area 101 using a gluing device. It is only necessary that the elastic insulating layer 33 can achieve a buffering effect and reduce the problem of glue layer dendrites caused by pulling of the glue layer on the bottom wall of the battery case.

[0097] 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-coated area 10 , and the other elastic insulating strip 331 is disposed at an interval on the other side opposite to the glue-coated area 10 .

[0098] By performing the above-mentioned arrangement on the elastic insulating layer 33, elastic insulating strips 331 are arranged on the opposite sides of the glue-coated area 10. The two elastic insulating strips 331 both play a buffering role. After the battery cell is pressed to unload the force, the occurrence of the glue layer dendrite problem caused by the pulling of the glue layer at various positions on the bottom wall of the battery box is reduced.

[0099] In one embodiment, according to the amount of glue required in each sub-glue coating area 101 , in the step of applying a corresponding amount of glue to each sub-glue coating area 101 using a glue coating device, the top surface of the glue is higher than the top surface of the elastic insulating layer 33 .

[0100] The top surface of the colloid refers to the surface of the colloid away from the bottom wall of the battery case. The top surface of the elastic insulating layer 33 refers to the surface of the elastic insulating layer 33 away from the bottom wall of the battery case. Since the coated colloid is initially piled up rather than directly and evenly spread on each sub-coating area 101, the top surface of the colloid is higher than the top surface of the elastic insulating layer 33. After the battery cell module is put into the box, the colloid is squeezed to form a flat surface glue layer. At this time, the surface of the glue layer away from the bottom wall of the battery case is the preset ideal plane β.

[0101] By setting up a glue coating device, a corresponding amount of glue is coated on each sub-glue coating area 101, and the top surface of the glue is higher than the top surface of the elastic insulating layer 33. When the battery cell module is put into the box, it first contacts and squeezes the glue, and then contacts and squeezes the elastic insulating layer 33. Among them, the squeezed glue after the battery cell module is put into the box makes the glue compressed to the height of the ideal plane, and the glue fills the entire sub-glue coating area. After the force squeezing the battery cell module is removed, the elastic insulating layer 33 partially rebounds, which plays a role in pressure relief.

[0102] In one embodiment, the elastic insulating layer 33 covers 5%-10% of the bottom wall area of ​​the battery case.

[0103] The elastic insulating layer 33 may cover 5%, 6%, 7%, 8%, 9%, 10% of the bottom wall area of ​​the battery case, or may be a range of any two of the above values, for example, 5%-8%, 7%-9%, etc.

[0104] By setting the elastic insulating layer 33 to cover 5%-10% of the bottom wall area of ​​the battery case, a good buffering effect can be achieved, which can effectively reduce the occurrence of glue layer dendrite problems caused by pulling of the glue layer at various positions on the bottom wall of the battery case; at the same time, the glue coating area of ​​the bottom wall of the battery case has a large enough area to keep the glue layer on the bottom wall of the battery case firmly fixed to the battery cell module.

[0105] In one embodiment, the thickness of the elastic insulating layer 33 is 1 mm to 2 mm.

[0106] The thickness of the elastic insulating layer 33 is 1 mm-2 mm, which is the thickness when the battery cell 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 can be a range consisting of any two of the above values, for example, 1 mm-1.6 mm, 1.4-1.9 mm, etc.

[0107] By setting the thickness of the elastic insulating layer 33 as above, the thickness of the elastic insulating layer 33 is appropriate, and the surface of the elastic insulating layer 33 away from the bottom wall of the battery case is lower than the surface of the glue layer (the glue layer at this time is the state before the battery cell module is put into the case) away from the bottom wall of the battery case, thereby maintaining the stability of the bonding and fixation between the glue layer and the battery cell module; at the same time, after the battery cell is put into the case, the battery cell is pressed, and the elastic insulating layer 33 located under the battery cell is compressed and deformed by force. The thickness setting of the elastic insulating layer 33 can provide sufficient deformation, which can buffer the deformation of the bottom wall of the battery case after the force is unloaded, and reduce the uneven glue coating caused by the rebound of the bottom wall of the battery case pulling the glue layer.

[0108] See also Figure 4 , Figure 4 It is a structural schematic diagram of a preparation system of a battery device provided in an embodiment of the present application.

[0109] The embodiment of the present application also provides a preparation system for a battery device, including an image collector 21, an image processing circuit 22, a calculation circuit 23, a glue coating device 24, and an assembly module 25. The image collector 21 is used to collect a topographic image of the bottom wall of the battery case, and the topographic image includes a glue coating area. The image processing circuit 22 is used to divide the glue coating area into a plurality of sub-glue coating areas. The calculation circuit 23 is used to calculate the amount of glue required for each sub-glue coating area based on the flatness of each sub-glue coating area. The glue coating device 24 is used to apply a corresponding amount of glue to each sub-glue coating area according to the amount of glue required for each sub-glue coating area. The assembly module 25 is used to set an elastic insulating layer on the bottom wall of the battery case.

[0110] By making the above-mentioned settings to the preparation system of the battery device, the amount of glue applied can be adjusted according to the unevenness of different positions of the bottom wall of the battery box, thereby maintaining good flatness of the surface of the glue layer, and further maintaining consistency in the height of the glue layer between the battery cell and the bottom wall of the battery box after the battery cell is placed in the box.

[0111] It should be noted that the battery device manufacturing system provided in the embodiment of the present application can be manufactured using the battery device manufacturing method provided in the above embodiment.

[0112] In one embodiment, the glue coating device includes a control circuit and a glue coating head. The control circuit is used to control the glue coating amount and glue coating speed of the glue coating head. The glue coating head is used to apply glue to the bottom wall of the battery box, and the glue coating head can accurately apply glue to a designated position according to the instructions of the control circuit.

[0113] In one embodiment, the assembly module includes a robot configured to automatically place the elastic insulating layer at a preset position on the bottom wall of the battery box.

[0114] See also Figures 5 to 8 , Figure 5 is a schematic diagram of the structure of a battery device provided in an embodiment of the present application, Figure 6 is a schematic diagram of a top view of the bottom wall of a battery box provided in an embodiment of the present application, Figure 7 yes Figure 6 Schematic diagram of the cross section along line AA, Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of area B shown.

[0115] The battery device 3 provided in the embodiment of the present application includes a battery case 31, a plurality of battery cells 32, an elastic insulating layer 33 and a glue layer 34. The battery case 31 includes a side wall 312a and a bottom wall 312b. The plurality of battery cells 32 are arranged in the battery case 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.

[0116] The battery case 31 forms a receiving chamber 310. A plurality of battery cells 32 are received in the receiving chamber 310. The battery case 31 can protect the battery cells 32 and also facilitates the collection of the plurality of battery cells 32.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] In the embodiment of the present application, a glue layer 34 is set between the battery cell 32 and the bottom wall 312b, and the glue layer 34 fixes the battery cell 32 and the bottom wall 312b, thereby reducing the shaking or displacement of the battery cell 32 in the battery box 31; by setting the glue layer 34 between the battery cell 32 and the bottom wall 312b, when the battery cell module is pressed, the battery cell 32 contacts the elastic insulating layer 33, and after the force is unloaded, the elastic insulating layer 33 plays a buffering role, and the bottom wall 312b of the battery box 31 basically does not rebound, thereby reducing the occurrence of the glue layer dendrite problem caused by the glue layer of the bottom wall 312b of the battery box 31 being pulled after the force is unloaded.

[0123] 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 other side opposite to the adhesive layer 34 .

[0124] By performing the above-mentioned arrangement on the elastic insulating layer 33, elastic insulating strips 331 are arranged on opposite sides of the glue layer 34. The two elastic insulating strips 331 both play a buffering role. After the battery cell 32 is pressed to unload the force, the occurrence of the glue layer dendrite problem caused by the pulling of the glue layer 34 at various positions of the bottom wall 312b of the battery box 31 is reduced.

[0125] Optionally, the elastic insulating strip 331 extends along a straight line.

[0126] Optionally, along the extension direction of the elastic insulating strip 331, the end surface of the elastic insulating strip 331 is flush with the end surface 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. With the above arrangement, the elastic insulating strip 331 can achieve a good buffering effect.

[0127] In one embodiment, the elastic insulating layer 33 covers 5%-10% of the area of ​​the bottom wall 312 b.

[0128] The area of ​​the bottom wall 312b of the battery case 31 covered by the elastic insulating layer 33 may be 5%, 6%, 7%, 8%, 9%, 10%, etc., or may be a range consisting of any two of the above values, for example, 5%-8%, 7%-9%, etc.

[0129] By setting the elastic insulating layer 33 to cover 5%-10% of the area of ​​the bottom wall 312b of the battery case 31, a good buffering effect can be achieved, so as to effectively reduce 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 case 31; at the same time, the glue layer 34 on the bottom wall 312b of the battery case 31 has a sufficiently large setting area, so that the glue layer 34 on the bottom wall 312b of the battery case 31 can firmly fix the battery cell 32.

[0130] In one embodiment, the thickness of the elastic insulating layer 33 is 0.3 mm-1 mm.

[0131] 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.

[0132] 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.

[0133] 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 .

[0134] 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.

[0135] 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.

[0136] In one embodiment, the elastic insulating layer 33 is a foam layer.

[0137] 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.

[0138] See also Fig. 9, Fig. 9 It is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application.

[0139] The battery cell 32 includes an end cover 321 , a housing 322 , a battery cell assembly 323 and other functional components.

[0140] The end cap 321 refers to a component that covers the opening of the shell 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 shell 322 to match the shell 322. Optionally, the end cap 321 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 321 is not easily deformed when squeezed and collided, so that the battery cell 32 can have a higher structural strength and the stability can also be improved.

[0141] Functional components such as electrode terminals 321a may be provided on the end cap 321. The electrode terminals 321a may be used to electrically connect to the battery cell assembly 323 to output or input electrical energy of the battery cell 32. In some embodiments, the end cap 321 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 32 reaches a threshold value.

[0142] The end cover 321 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0143] In some embodiments, an insulating member may be provided inside the end cap 321, and the insulating member may be used to isolate the electrical connection components in the housing 322 from the end cap 321 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0144] The shell 322 is a component used to cooperate with the end cover 321 to form the internal environment of the battery cell 32, wherein the formed internal environment can be used to accommodate the battery cell assembly 323, electrolyte and other components. The shell 322 and the end cover 321 can be independent components, and an opening can be set on the shell 322, and the internal environment of the battery cell 32 is formed by covering the opening with the end cover 321 at the opening. Without limitation, the end cover 321 and the shell 322 can also be integrated. Specifically, the end cover 321 and the shell 322 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 322, the end cover 321 covers the shell 322. The shell 322 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 322 can be determined according to the specific shape and size of the battery cell assembly 323. The shell 322 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0145] The cell assembly 323 is a component in the battery cell 32 where electrochemical reactions occur. One or more cell assemblies 323 may be contained in the housing 322. The cell assembly 323 includes a positive electrode sheet, a negative electrode sheet and a separator, the separator is located between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are wound or stacked to form the cell assembly 323. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the cell assembly 323, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device 3, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals 321a to form a current loop.

[0146] The battery device disclosed in the embodiments of the present application can be used in electronic devices that use batteries as power sources. The electronic device can be an electrical device that uses batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical device includes an equipment body and the battery device provided in the above embodiments, and the battery device is arranged in the equipment body. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, spacecrafts, and the like.

[0147] For the convenience of description, the following embodiments are described by taking a vehicle 40 as an example of an electronic device in an embodiment of the present application. Fig.10 , Fig.10 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application.

[0148] The vehicle 40 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery device 3 is provided inside the vehicle 40, and the battery device 3 may be provided at the bottom, head or tail of the vehicle 40. The battery device 3 may be used to power the vehicle 40, for example, the battery device 3 may be used as an operating power source for the vehicle 40. The vehicle 40 may further include a controller 401 and a motor 402, and the controller 401 is used to control the battery device 3 to power the motor 402, for example, for starting, navigating and driving the vehicle 40.

[0149] In some embodiments of the present application, the battery device 3 can not only serve as an operating power source for the vehicle 40 , but also serve as a driving power source for the vehicle 40 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 40 .

[0150] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for preparing a battery device, characterized in that: include: Collecting a topographic image of the bottom wall of the battery box; the topographic image includes a glue-coated area; Dividing the glue coating area into a plurality of sub-glue coating areas; Calculating the amount of glue required for each of the sub-glue coating areas according to the flatness of each of the sub-glue coating areas; According to the amount of glue required to be applied to each of the sub-glue-applying areas, a glue-applying device is used to apply a corresponding amount of glue to each of the sub-glue-applying areas; The method for preparing the battery device further comprises: An elastic insulating layer is provided on the bottom wall of the battery box; The glue-coated area is located outside the elastic insulating layer.

2. The method for preparing a battery device according to claim 1, characterized in that: The step of dividing the glue coating area into a plurality of sub-glue coating areas comprises: The glue coating area is divided into a plurality of sub-glue coating areas with the same area.

3. The method for preparing a battery device according to claim 1, characterized in that: The step of calculating the amount of glue required for each of the sub-glue coating areas according to the flatness of each of the sub-glue coating areas comprises: Obtaining a fitting plane according to the flatness of the sub-gluing area; The amount of glue required for the sub-glue coating area is obtained according to the fitting plane and the ideal plane; wherein the ideal plane is the top surface of the preset glue layer.

4. The method for preparing a battery device according to claim 3, characterized in that: The step of obtaining the amount of glue required for the sub-glue coating area according to the fitting plane and the ideal plane comprises: Calculating the volume of the area between the fitting plane and the ideal plane according to the fitting plane and the ideal plane; The mass of glue required for the sub-glue coating area is obtained according to the volume of the area between the fitting plane and the ideal plane and the density of the colloid.

5. The method for preparing a battery device according to claim 4, characterized in that: According to the amount of glue required for each of the sub-glue coating areas, the step of using a glue coating device to coat the colloid of the corresponding amount of glue in each of the sub-glue coating areas comprises: The glue output per unit time when the glue coating device coats each of the sub-gluing areas is obtained according to the glue quality required for coating each of the sub-gluing areas and the gluing rhythm of the gluing device; wherein the gluing rhythm of the gluing device is the gluing time of the gluing device in each of the sub-gluing areas; The glue coating device is controlled to coat each of the sub-gluing areas with glue according to the glue output per unit time when the glue coating device coats each of the sub-gluing areas with glue.

6. The method for preparing a battery device according to claim 5, characterized in that: The step of controlling the glue coating device to coat each of the sub-gluing areas with glue according to the glue output per unit time when the glue coating device coats each of the sub-gluing areas with glue comprises: According to the difference in glue output per unit time when the glue coating device coats each of the sub-glue coating areas, the plurality of sub-glue coating areas are divided into a plurality of groups; wherein the glue output per unit time corresponding to the sub-glue coating areas in the same group is the same; Glue coating is performed on the sub-glue coating areas of the plurality of groups in sequence according to the order of glue output per unit time.

7. The method for preparing a battery device according to claim 1, characterized in that: The step of providing an elastic insulating layer on the bottom wall of the battery box is performed before the step of acquiring a topographic image of the bottom wall of the battery box.

8. The method for preparing a battery device according to claim 7, characterized in that: The elastic insulating layer includes two elastic insulating strips; one of the elastic insulating strips is arranged on one side of the glue-coated area, and the other elastic insulating strip is arranged at an interval on the other side opposite to the glue-coated area.

9. The method for preparing a battery device according to claim 1, characterized in that: According to the amount of glue required for each of the sub-glue coating areas, in the step of applying a corresponding amount of glue to each of the sub-glue coating areas using a glue coating device, the top surface of the glue is higher than the top surface of the elastic insulating layer.

10. The method for preparing a battery device according to claim 1, characterized in that: The elastic insulating layer covers 5%-10% of the bottom wall area of ​​the battery box.

11. The method for preparing a battery device according to claim 1, characterized in that: The thickness of the elastic insulating layer is 1 mm to 2 mm.

12. A system for preparing a battery device, characterized in that: include: An assembly module is used to provide an elastic insulating layer on the bottom wall of the battery box; An image collector, used to collect a topographic image of the bottom wall of the battery box; The topographic image includes a glue-coated area; An image processing circuit, used for dividing the glue-coated area into a plurality of sub-glue-coated areas; A calculation circuit, used for calculating the amount of glue required for each of the sub-glue coating areas according to the flatness of each of the sub-glue coating areas; The glue coating device is used to coat the glue of the corresponding amount in each of the sub-glue coating areas according to the amount of glue required in each of the sub-glue coating areas.

13. A battery device, characterized in that: include: A battery box, comprising side walls and a bottom wall; A plurality of battery cells are arranged in the battery box; An elastic insulating layer, disposed between the plurality of battery cells and the bottom wall; The glue layer is disposed between the plurality of battery cells and the bottom wall and is located in the area not covered by the elastic insulating layer.

14. The battery device according to claim 13, characterized in that: The elastic insulating layer includes two elastic insulating strips; one of the elastic insulating strips is arranged on one side of the adhesive layer, and the other elastic insulating strip is arranged on the other side opposite to the adhesive layer.

15. The battery device according to claim 13, characterized in that: The elastic insulating layer covers 5%-10% of the area of ​​the bottom wall.

16. The battery device according to claim 13, characterized in that: The thickness of the elastic insulating layer is 0.3 mm-1 mm.

17. The battery device according to any one of claims 13 to 16, characterized in that: 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.

18. The battery device according to any one of claims 13 to 16, characterized in that: The elastic insulating layer is a foam layer.

19. An electronic device, characterized in that: include: A battery device according to any one of claims 13 to 18.

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