Battery cell assembly, battery module, battery pack, power utilization device and manufacturing method

Abstract

The invention provides a battery cell assembly, a battery module, a battery pack, a power utilization device and a method for manufacturing the battery cell assembly, and belongs to the technical field of batteries. The battery cell assembly comprises a battery cell, a fixed structural part wound on the outer side of the battery cell and an elastic part; wherein the elastic part is arranged between the fixed structural part and the battery cell and is used for buffering expansion generated in the charging process of the battery cell. The invention aims to solve the technical problems of avoiding introduction of excessive metal structural members and improving the grouping efficiency of battery cells and the energy density of a battery module while inhibiting the expansion of the battery cells. The battery cell assembly has the technical effects that the battery cell assembly which is low in cost and easy to realize is provided by combining the fixed structural part with the elastic part, and the volume change caused by the expansion of the battery cell can be controlled in the battery cell assembly.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell assembly, a battery module, a battery pack, an electrical device, and a method for manufacturing a battery cell assembly. Background Art

[0002] A battery module usually includes one or more battery cells. During the charging process of the battery module, the battery cells are commonly subject to expansion. This phenomenon not only affects the structural stability of the battery module, but may also have an adverse effect on the performance and life of the battery cells. In order to effectively suppress the expansion of the battery cells during the charging process, metal materials such as aluminum alloys and steel are currently commonly used as the shell or constraint structure of the battery cells to limit the expansion of the battery cells.

[0003] However, the existing solution of using metal materials to limit the expansion of battery cells has the problem of reduced efficiency of battery cell grouping. Specifically, the introduction of metal structural parts will greatly increase the overall weight of the battery cell module, reducing the number of battery cells that can be installed at the same weight, resulting in a decrease in the energy density and overall performance of the battery module.

[0004] Therefore, the problem that the present application aims to solve is: how to suppress the expansion of battery cells while avoiding the introduction of excessive metal structural parts, thereby improving the grouping efficiency of battery cells and the energy density of battery modules. Summary of the invention

[0005] In view of the above problems, the present application provides a battery cell assembly, a battery module, a battery pack, an electrical device and a method for manufacturing a battery cell assembly.

[0006] According to a first aspect of the present application, a battery cell assembly is provided, comprising a battery cell, a fixed structure wrapped around the outside of the battery cell, and an elastic member; wherein the elastic member is arranged between the fixed structure and the battery cell to buffer the expansion of the battery cell during charging.

[0007] In the technical solution of the embodiment of the present application, the elastic member is realized by a material with a certain deformation ability. When the battery cell expands during the charging process, the elastic member can be compressed by the battery cell to offset the volume change caused by the expansion; when the volume of the battery cell recovers after the charging is completed, the elastic member can rebound in coordination with the volume reduction of the battery cell to keep the overall volume of the battery cell assembly unchanged. The fixed structural member wrapped around the outside of the battery cell is used to protect the battery cell and define the structure of the battery cell assembly. The present application provides a low-cost and easy-to-implement battery cell assembly by combining a fixed structural member with an elastic member, which can control the volume change caused by the expansion of the battery cell within the battery cell assembly.

[0008] In some embodiments, the fixed structure includes a wire or a tape, which is tensionedly wound from the bottom of the battery cell to the top of the battery cell to compress and tighten the battery cell and the elastic member. The fixed structure is achieved by winding the wire or the tape, and can be adapted to battery cells of different sizes or shapes. By tensioning the wire or the tape to the outside of the battery cell, on the one hand, the battery cell assembly structure can be kept compact, and on the other hand, the fixed structure can have a certain shear strength and hardness, which is beneficial to protect the internal structure of the battery cell assembly.

[0009] In some embodiments, the fixed structural member is composed of carbon fiber filaments or glass fiber. Carbon fiber or glass fiber materials have the characteristics of high tensile strength, light weight, high temperature resistance and wear resistance, which can significantly improve the structural strength and stability of the battery cell assembly without significantly increasing the overall weight. In particular, carbon fiber filaments and glass fibers have good plasticity and weavability, can flexibly adapt to various shapes of battery cells, and are conducive to achieving the desired winding.

[0010] In some embodiments, the fixing structure is coated with adhesive after being wound around the battery cell, so that the fixing structure maintains tension when the adhesive is cured, so that the elastic member fits tightly with the battery cell.

[0011] In the technical solution of the embodiment of the present application, the adhesive is a curable adhesive, for example, it can be an epoxy resin or an acrylate or a polyurethane adhesive or an anaerobic adhesive or a light-curing adhesive, or other curable adhesives that can be thought of by those skilled in the art. The adhesive described herein is a fluid with a certain fluidity before curing, and the adhesive forms a rigid structure after curing. It should be understood that the adhesive is tightly combined with the fixed structural member after curing to form an indivisible integral structure similar to a "hardened shell", and the formed integral structure has shear resistance and deformation resistance, which is beneficial to protect the internal structure of the battery cell assembly from damage by the external environment. For example, the overall structure formed after curing can reduce the possibility of moisture or dust or corrosive substances penetrating into the battery cell assembly to a certain extent to endanger the battery cell, thereby extending the service life of the battery cell assembly.

[0012] Through the above curing, on the one hand, the tension of the fixed structure can be maintained for a long time, thereby enhancing the mechanical stability and durability of the fixed structure; on the other hand, by compressing and tightening from the outside, the elastic member can more sensitively absorb / compensate for the expansion / contraction of the battery cell by keeping in contact with the battery cell. Furthermore, the fixed structure can form a rigid structure after the adhesive is cured, thereby limiting the excessive expansion of the battery cell.

[0013] In some embodiments, the fixed structure is wound along the length direction of the battery cell to form a fixed structure group with a plurality of turns, and there is a first spacing between adjacent turns of the fixed structure group. Through this design, the stress distribution on the surface of the battery cell caused by the expansion of the battery cell can be made more uniform, reducing the risk of local rupture or other structural damage to the battery cell. By setting the first spacing, a space for deformation of the elastic member is provided, so that after the adhesive is applied to the fixed structure and cured, the elastic member can still absorb / compensate for the expansion / contraction of the battery cell well.

[0014] In some embodiments, the first spacing has a fixed value or the first spacing gradually decreases from the middle of the battery cell to the edge of the battery cell along the length direction of the battery cell. By setting the first spacing to a fixed value, a uniform binding force can be provided and the manufacturing process can be simplified. In some embodiments, the first spacing is set to gradually decrease from the middle of the battery cell to the edge of the battery cell. This is because the expansion amplitude of the middle part of the battery cell is greater than that of the two sides. Such a design can prevent the battery cell from being damaged due to excessive compression of the fixed structure.

[0015] In some embodiments, the elastic member includes foam, and the elastic member is configured to have the same shape as the top and bottom of the battery cell. It should be understood that the top and bottom of the battery cell refer to the two largest surfaces relative to each other among all the outer surfaces of the battery cell, and the top and bottom of the battery cell are the two surfaces with the largest expansion amplitude of the battery cell. Such a design allows the elastic member to fit and cover the entire top and bottom of the battery cell, improving the buffering effect of the elastic member on the expansion of the battery cell.

[0016] According to a second aspect of the present application, a battery module is provided, comprising a housing and at least one battery cell assembly in the above-mentioned embodiment. The housing is used to support and fix the battery cell assembly and provide packaging for one or more battery cell assemblies. Optionally, multiple battery cell assemblies can be arranged in the housing in a parallel or series manner. Such a battery module can provide the advantages described above for the battery cell assembly, which will not be repeated for the sake of brevity.

[0017] According to a third aspect of the present application, a battery pack is provided, comprising the battery module in the above-mentioned embodiment. One or more battery modules may be integrated in the battery pack. The battery pack can be used to provide greater power storage capacity and output power. For example, the battery pack may include a battery management system (BMS), a cooling system, a housing, and a connector to monitor the normal operation of the battery module and provide the desired power output. It should be understood that the battery pack is a highly integrated battery system that can provide or store power as needed. Such a battery pack can provide the advantages described above for the battery cell assembly, which will not be repeated for the sake of brevity.

[0018] According to a fourth aspect of the present application, there is provided an electric device, comprising a battery pack in the above embodiment, the battery pack being used to provide electric energy. The electric device may be, for example, a car, a large work platform, a portable digital product, or a power network. Such an electric device can provide the advantages described above with respect to the battery cell assembly, which will not be described in detail for the sake of brevity.

[0019] According to a fifth aspect of the present application, a method for manufacturing a battery cell assembly is provided, comprising: providing a battery cell; attaching elastic members to the top and bottom of the battery cell, the elastic members being used to buffer the expansion of the battery cell during charging; and wrapping a fixed structure around the outer side of the battery cell, so that the elastic member is arranged between the fixed structure and the battery cell. Such a method for manufacturing a battery cell assembly can provide the advantages described above with respect to the battery cell assembly, and for the sake of brevity, no further description is given.

[0020] In some embodiments, the method for manufacturing a battery cell assembly further includes: applying an adhesive to a fixed structure member to maintain tension on the fixed structure member when the adhesive is cured, so that the elastic member fits tightly with the battery cell. Such a method for manufacturing a battery cell assembly can provide the advantages described above with respect to the battery cell assembly, which will not be described in detail for the sake of brevity.

[0021] In some embodiments, the fixed structure includes a wire or a ribbon, wherein the method for manufacturing a battery cell assembly further includes: providing tension to the wire or the ribbon by a conveying device before the fixed structure is wrapped around the outer side of the battery cell. The conveying device may include a tensioning device for providing a preset tension to the wire or the ribbon.

[0022] By providing a conveying device, on the one hand, the wire or ribbon can be kept taut during the winding process, and on the other hand, the tightness of the winding of the fixed structure can be adjusted as needed. The conveying device may also include a mobile positioning device for limiting the output position of the conveying device (such as the position of the nozzle). The mobile positioning device may be, for example, a linear guide controlled by a stepper motor. The first spacing as described above can be provided by the mobile positioning device. For example, during the winding process, the mobile positioning device moves at a uniform speed in a direction parallel to the length direction of the battery cell, so that the fixed structure can be wound along the length direction of the battery cell to form a fixed structure group with a plurality of turns, and adjacent turns of the fixed structure group have a fixed spacing. The movement of the mobile positioning device can be adjusted as needed to achieve various desired windings.

[0023] In some embodiments, the coating is performed before the fixed structure is wound around the outside of the battery cell, wherein the adhesive is applied to the fixed structure by a coating device. The use of a coating device can make the adhesive more evenly applied to the fixed structure. Furthermore, in the case of winding multiple layers, applying the adhesive by a coating device before winding can make the adhesive applied to the inner fixed structure consistent with the outer layer, thereby improving the curing effect.

[0024] In some embodiments, the coating is performed after the fixing structure is wrapped around the outer side of the battery core. Such a coating method can simplify the manufacturing process.

[0025] In some embodiments, the method for manufacturing a battery cell assembly further includes: applying pressure to the battery cell assembly by a pressing device before the adhesive is cured, and separating the pressing device from the battery cell assembly after the adhesive is cured. The use of the pressing device can reduce gaps caused by loose fitting on the one hand, and improve the strength of the structure after curing on the other hand, so as to achieve a better protection effect of the fixed structural member on the battery cell.

[0026] In the technical solution of the embodiment of the present application, the clamping device may include a first part and a second part, and the first part and the second part compress the battery cell assembly from two opposite sides of the battery cell assembly in a structure similar to a "sandwich", and the first part and the second part are configured to match the shape of the battery cell assembly at the part contacting the battery cell assembly, so that the battery cell assembly is clamped in an interlocking manner. For example, the first part and the second part can be formed by mold molding. With this clamping device, the pressure can be evenly transferred to the surface of the battery cell assembly, which is conducive to obtaining a good curing effect and eliminating internal stress, thereby improving the overall strength of the battery cell assembly.

[0027] It should be understood that 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

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 A schematic diagram showing the structure of a battery cell assembly in some embodiments of the present application is shown;

[0030] Figure 2 Shows Figure 1 A side view of a battery cell assembly in FIG.

[0031] Figure 3 Exemplary steps of a method for manufacturing a battery cell assembly according to some embodiments of the present application are shown;

[0032] Figure 4 A schematic diagram showing a method of manufacturing a battery cell assembly by providing a conveying device according to some embodiments of the present application is shown;

[0033] Figure 5 A schematic diagram of manufacturing a battery cell assembly by providing a coating device according to some embodiments of the present application is shown.

[0034] The reference numerals in the specific implementation manner are as follows:

[0035] Length direction X, width direction Y, thickness direction Z;

[0036] Battery cell assembly 10;

[0037] Battery cell 20, battery cell top 21, battery cell bottom 22;

[0038] Fixed structure 30;

[0039] An elastic member 40, a first elastic member 41, and a second elastic member 42;

[0040] Coating device 50;

[0041] Conveying device 60. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] The present application relates to a battery cell assembly, which can suppress the expansion of the battery cell while avoiding the introduction of too many metal structural parts. The battery cell assembly disclosed in the present application can be used in a battery.

[0051] Reference Figure 1 and Figure 2 , Figure 1A schematic diagram showing the structure of a battery cell assembly 10 in some embodiments of the present application is shown; Figure 2 Shows Figure 1 The battery cell assembly 10 includes a battery cell 20, a fixed structure 30 wrapped around the outside of the battery cell 20, and elastic members 41 and 42. The elastic members 41 and 42 are arranged between the fixed structure 30 and the battery cell 20 to buffer the expansion of the battery cell 20 during charging.

[0052] like Figure 1 As shown, the x direction is the length direction of the battery cell 20, the y direction is the width direction of the battery cell 20, and the z direction is the thickness direction of the battery cell 20. The battery cell 20 has a top and a bottom, and the top and the bottom are opposite to each other in the thickness direction of the battery cell 20.

[0053] exist Figure 1 In the illustrated embodiment, the elastic members 41 and 42 are made of materials with a certain degree of deformation ability. In other words, the elastic members 41 and 42 are compressible and resilient materials. When the battery cell 20 expands during charging, the elastic members 41 and 42 can be compressed by the battery cell 20 to offset the volume change caused by the expansion; when the volume of the battery cell 20 is restored after charging, the elastic members 41 and 42 can rebound in coordination with the volume reduction of the battery cell 20 to keep the overall volume of the battery cell assembly 10 unchanged.

[0054] like Figure 2 As shown, the elastic member 41 is arranged between the fixed structure member 30 and the top 21 of the battery cell 20, and the elastic member 42 is arranged between the fixed structure member 30 and the bottom 22 of the battery cell 20 to absorb the expansion at the two surfaces of the battery cell 20 with the largest expansion amplitude. The fixed structure member 30 can protect the battery cell 20 and provide support for the elastic members 41 and 42 to limit the maximum expansion of the battery cell 20 from the outside. By combining the fixed structure member 30 with the elastic members 41 and 42, the volume change caused by the expansion of the battery cell 20 can be controlled inside the battery cell assembly 10.

[0055] Continue to refer to Figure 1 The fixing structure 30 includes a wire or a belt, which is tensionedly wound from the bottom of the battery cell 20 to the top of the battery cell 20 to compress and tighten the battery cell 20 and the elastic members 41 and 42 .

[0056] exist Figure 1In the illustrated embodiment, the wire or tape 30 is tensioned and wound from the bottom of the battery cell 20 to the top of the battery cell 20, and is wound around the entire outer periphery of the battery cell 20. This winding can be applied to battery cells of different sizes or shapes, so the battery cell assembly 10 can be advantageously made of battery cells of different sizes or shapes. It should be understood that the tensioned winding refers to providing a predetermined tensioning force for the wire or tape 30, and the wire or tape 30 remains tensioned for an expected time after being wound around the battery cell 20. In some embodiments, the expected time may be, for example, the service life calibrated by the manufacturer of the battery cell assembly. By tensioning the wire or tape 30 around the outside of the battery cell 20, on the one hand, the volume can be reduced, the structure of the battery cell assembly 10 can be kept compact, and the energy density of the battery cell assembly 10 can be improved; on the other hand, the fixed structural member 30 can maintain a certain shear strength and hardness, which is beneficial to protect the internal structure of the battery cell assembly 10.

[0057] Continue to refer to Figure 1 The fixed structure 30 is made of carbon fiber or glass fiber. Carbon fiber or glass fiber materials have the characteristics of high tensile strength, light weight, high temperature resistance and wear resistance, which can significantly improve the structural strength and stability of the battery cell assembly 10 without significantly increasing the overall weight.

[0058] exist Figure 1 In the illustrated embodiment, the high tensile strength of the carbon fiber filaments or glass fibers enables a greater tension to be applied during the process of winding the fixed structure member 30 , further improving the shear strength and hardness of the fixed structure member 30 .

[0059] Continue to refer to Figure 1 After being wound around the battery cell 20 , the fixing structure 30 is coated with adhesive to keep the fixing structure 30 in tension when the adhesive is cured, so that the elastic members 41 , 42 are closely attached to the battery cell 20 .

[0060] exist Figure 1 In the illustrated embodiment, the adhesive applied to the fixed structure 30 is a curable adhesive. The adhesive used is a fluid with a certain fluidity before curing, and forms a rigid structure after curing. The adhesive infiltrates the fixed structure 30 after coating, and the adhesive coats all parts of the fixed structure 30. Through this coating method, the adhesive is tightly combined with the fixed structure 30 after curing to form an indivisible integral structure similar to a "hardened shell", and the formed integral structure has shear resistance and deformation resistance, which is beneficial to protect the internal structure of the battery cell assembly 10 from damage by the external environment. The integral structure formed after curing can reduce the possibility of moisture, dust or corrosive substances penetrating into the battery cell assembly 10 and endangering the battery cell 20, thereby extending the service life of the battery cell assembly 10.

[0061] By curing after coating, the tension of the fixed structure 30 can be maintained, and the mechanical stability and durability of the fixed structure 30 can be enhanced. By compressing and tightening the fixed structure 30 from the outside, the elastic member 30 can be kept in close contact with the battery cell 20, so as to more sensitively absorb / compensate for the expansion / contraction of the battery cell 20. In addition, the rigid structure formed by the adhesive and the fixed structure 30 after curing can provide an effect similar to that of a module shell, limiting the excessive expansion of the battery cell.

[0062] Continue to refer to Figure 1 The fixed structure 30 is wound along the length direction of the battery cell to form a fixed structure group with multiple turns, and there is a first spacing between adjacent turns of the fixed structure group. Through this design, the surface stress distribution of the battery cell 20 after expansion can be made more uniform, reducing the risk of local rupture or other structural damage to the battery cell 20. By setting the first spacing, a deformation space is provided for the elastic members 41 and 42, so that after the adhesive is applied and cured on the fixed structure 30, the elastic members 41 and 42 can still absorb / compensate for the expansion / contraction of the battery cell 20 well.

[0063] exist Figure 1 In the illustrated embodiment, the first spacing between adjacent turns of the fixed structure group has a fixed value. By setting the first spacing to a fixed value, a uniform binding force can be provided and the manufacturing process can be simplified.

[0064] In other embodiments of the present application, the first spacing is set to gradually decrease from the middle of the battery cell 20 to the edge of the battery cell 20. Here, the middle refers to the middle of the length direction of the battery cell 20. At the top 21 and the bottom 22 of the battery cell 20, the expansion of the middle is greater than the edge. Therefore, adopting such a first spacing can allow the middle of the battery cell to have a greater expansion than the edge, thereby preventing damage to the battery cell.

[0065] Continue to refer to Figure 1 , the elastic members 41 and 42 include foam, and the elastic members 41 and 42 are configured to have the same shape as the top 21 and the bottom 22 of the battery cell 20. The shape of the foam can be made the same as the top 21 and the bottom 22 of the battery cell 20 by cutting. Such a design allows the elastic members 41 and 42 to fit and cover the entire area of ​​the top 21 and the bottom 22 of the battery cell 22, thereby improving the buffering effect of the elastic members 41 and 42 on the expansion of the battery cell 20.

[0066] In some embodiments of the present application, the battery module may include a box and one or more battery cell assemblies 10. The box is used to support and fix the battery cell assembly 10 and provide packaging for the one or more battery cell assemblies 10.

[0067] In some embodiments of the present application, the battery module includes a box and a plurality of battery cell assemblies 10, and the plurality of battery cell assemblies 10 are arranged in the box in a parallel connection. In other embodiments of the present application, the plurality of battery cell assemblies 10 are arranged in the box in a series connection. The number and connection mode of the battery cell assemblies can be configured according to the desired voltage or current or other output parameters.

[0068] In some embodiments of the present application, the battery pack includes the battery module in the above-mentioned embodiments. Multiple battery modules can be integrated in the battery pack to provide greater power storage capacity and output power. The battery pack also includes a battery management system (BMS), a cooling system, a housing, and a connector to monitor the normal operation of the battery module and provide the desired power output. In other embodiments of the present application, the battery pack can be configured with connectors, switches, or other electrical components for external electrical connections as needed.

[0069] In some embodiments of the present application, the power-consuming device includes the battery pack in the above embodiment, and the battery pack is used to provide electrical energy. The power-consuming device may be, for example, a car, a large work platform, a portable digital product, or a power network.

[0070] Reference Figure 3 , Figure 3 Exemplary steps of a method for manufacturing a battery cell assembly 10 according to some embodiments of the present application are shown, including: step S10, providing a battery cell 20; step S20, attaching elastic members 41 and 42 to the top 21 and the bottom 22 of the battery cell 20, the elastic members 41 and 42 being used to buffer the expansion of the battery cell 20 during charging; step S30, winding a fixed structure 30 around the outside of the battery cell 20, so that the elastic members 41 and 42 are arranged between the fixed structure 30 and the battery cell 20.

[0071] In some embodiments of the present application, the method for manufacturing the battery cell assembly 10 further includes applying an adhesive to the fixing structure 30 to keep the fixing structure 30 in tension when the adhesive is cured, so that the elastic members 41 and 42 fit tightly against the battery cell 20 .

[0072] Reference Figure 4 , Figure 4 A schematic diagram of manufacturing a battery cell assembly by providing a conveying device according to some embodiments of the present application is shown, including a battery cell 20 , a fixed structure 30 , elastic members 41 , 42 and a conveying device 60 .

[0073] exist Figure 4In the illustrated embodiment, the fixing structure 30 comprises a wire or a ribbon, wherein the method for manufacturing the battery cell assembly 10 comprises providing tension to the wire or the ribbon by a conveying device 60 before winding the fixing structure 30 around the outer side of the battery cell 20. The conveying device 60 comprises a tensioning device (not shown) for providing a preset tension to the wire or the ribbon.

[0074] In some embodiments of the present application, the magnitude of the tension of the tensioning device is determined according to the tensile strength of the material of the fixed structure 30. In other embodiments of the present application, the magnitude of the tension of the tensioning device can also be determined according to the expansion amplitude of the battery cell 20, for example, the tensioning device provides a smaller tension of the fixed structure 30 for the battery cell 20 with a larger expansion amplitude, and provides a larger tension of the fixed structure 30 for the battery cell 20 with a smaller expansion amplitude.

[0075] Reference Figure 5 , Figure 5 A schematic diagram of manufacturing a battery cell assembly by providing a coating device according to some embodiments of the present application is shown, including a battery cell module 10, a coating device 50 and a conveying device 60.

[0076] exist Figure 5 In the illustrated embodiment, coating is performed before the fixing structure 30 is wrapped around the outer side of the battery cell 20, wherein the adhesive is coated on the fixing structure 30 by the coating device 50. The coating device 50 can make the adhesive be coated on the fixing structure 30 more uniformly.

[0077] In some embodiments of the present application, the fixing structure 30 is wound around the outer side of the battery core 20 to form multiple layers. The adhesive is applied by the coating device 50 so that the adhesive applied to the inner fixing structure 30 is consistent with that of the outer layer, thereby improving the curing effect.

[0078] Continue to refer Figure 4 In other embodiments of the present application, the coating is performed after the fixing structure 30 is wound around the outside of the battery cell 20. After the winding is completed, the adhesive can be applied to the fixing structure 30 by manual coating or machine laying. Such a coating method can simplify the manufacturing process.

[0079] In some embodiments of the present application, the method for manufacturing the battery cell assembly 10 further includes: before the adhesive is cured, applying pressure to the battery cell assembly 10 by a pressing device (not shown), and after the adhesive is cured, separating the pressing device from the battery cell assembly 10. The use of the pressing device can reduce the gap caused by the loose fit on the one hand, and improve the strength of the structure after curing on the other hand, so as to achieve a better protection effect of the fixed structure 30 on the battery cell 20. The pressing device may include a first part and a second part, the first part and the second part press the battery cell assembly 10 from two opposite sides of the battery cell assembly 10 according to a structure similar to a "sandwich", and the first part and the second part are configured to match the shape of the battery cell assembly 10 at the part contacting the battery cell assembly 10, so that the battery cell assembly 10 is pressed in an interlocking manner. Preferably, the first part and the second part are formed by mold molding. With this pressing device, the pressure can be evenly transferred to the surface of the battery cell assembly 10, which is conducive to obtaining a good curing effect and eliminating internal stress, and improving the overall strength of the battery cell assembly.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell assembly, comprising: Battery cells; A fixed structure, the fixed structure is wound around the outside of the battery core; as well as An elastic member is arranged between the fixing structure and the battery cell and is used to buffer the expansion of the battery cell during charging.

2. The battery cell assembly according to claim 1, wherein: The fixing structure comprises a wire or a belt, and the wire or the belt is wound tightly from the bottom of the battery core to the top of the battery core to compress and tighten the battery core and the elastic member.

3. The battery core assembly according to claim 1 or 2, wherein: The fixed structural member is composed of carbon fiber filaments or glass fiber.

4. The battery cell assembly according to claim 2, wherein: The fixing structure is coated with adhesive after being wound around the battery core, so that the fixing structure maintains tension when the adhesive is cured, so that the elastic member is closely attached to the battery core.

5. The battery cell assembly according to claim 2, wherein: The fixing structure is wound along the length direction of the battery core to form a fixing structure group having a plurality of turns, and there is a first spacing between adjacent turns of the fixing structure group.

6. The battery cell assembly according to claim 5, wherein: The first spacing has a fixed value or the first spacing gradually decreases from the middle of the battery cell to the edge of the battery cell along the length direction of the battery cell.

7. The battery cell assembly according to claim 1, wherein: The elastic member includes foam, and the elastic member is configured to have the same shape as the top and bottom of the battery core.

8. A battery module, comprising a housing and at least one battery cell assembly according to any one of claims 1 to 7.

9. A battery pack comprising the battery module according to claim 8.

10. An electrical device, comprising the battery pack according to claim 9, wherein the battery pack is used to provide electrical energy.

11. A method for manufacturing a battery cell assembly, comprising: Provide battery cells; Attaching elastic members to the top and bottom of the battery cell, the elastic members are used to buffer the expansion of the battery cell during charging; as well as The fixing structure is wound around the outside of the battery core so that the elastic member is arranged between the fixing structure and the battery core.

12. The method according to claim 11, wherein: The method further comprises: Adhesive is applied to the fixing structure to keep the fixing structure in tension when the adhesive is cured, so that the elastic member is closely attached to the battery core.

13. The method according to claim 11 or 12, wherein: The fixing structure comprises a wire or a ribbon, wherein the method further comprises: Before the fixing structure is wound around the outer side of the battery core, a conveying device provides tension to the wire or ribbon.

14. The method according to claim 12, wherein: The coating is performed before the fixing structure is wound around the outer side of the battery core, wherein the adhesive is coated on the fixing structure by a coating device.

15. The method according to claim 12, wherein: The coating is performed after the fixing structure is wound around the outer side of the battery core.

16. The method according to claim 12, wherein: The method further includes: applying pressure to the battery cell assembly by a pressing device before the adhesive is cured, and separating the pressing device from the battery cell assembly after the adhesive is cured.

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