Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, relates to the technical field of batteries, and can prevent an insulating film from being warped to severely jack up a patch due to rebound stress generated after an extending region of the insulating film is bent, so that the insulating effect of the battery is guaranteed. The single battery comprises a battery body, an insulating film and a patch, wherein the battery body comprises an outer side wall and an end wall; the insulating film at least covers part of the outer side wall of the battery body; the patch comprises a first patch part and a second patch part which are connected together, the first patch part covers the end wall of the battery body, the second patch part extends from the end wall of the battery body to the outer side wall and at least covers part of the outer side wall of the battery body, and the second patch part is in contact with the insulating film.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] With the continuous popularity of new energy vehicles and energy storage systems, more and more secondary batteries are applied, and the requirements for safety, energy density and other indicators are higher and higher. In order to ensure the insulation reliability of the battery, a layer of insulation film is usually wrapped in the main area of the secondary battery, and a layer of insulation patch is pasted on the top surface of the battery.

[0003] The common insulation film will extend to the top cover area and be covered by the patch, but the rebound stress caused by the bending of the extended area of the insulation film will cause the insulation film to be seriously warped and the patch to be lifted, resulting in that the insulation effect of the battery cannot be guaranteed. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the present application provides a battery monomer, a battery device and an electric equipment, which can prevent the rebound stress caused by the bending of the extended area of the insulation film from causing the insulation film to be seriously warped and the patch to be lifted, so that the insulation effect of the battery can be guaranteed.

[0005] The present application is achieved by the following technical solutions.

[0006] The first aspect of the present application provides a battery monomer, which comprises a battery body, an insulation film and a patch, wherein the battery body comprises an outer side wall and an end wall; the insulation film covers at least part of the outer side wall of the battery body; the patch comprises a first patch part and a second patch part connected together, the first patch part covers the end wall of the battery body, the second patch part extends from the end wall to the outer side wall of the battery body and covers at least part of the outer side wall of the battery body, and the second patch part is in contact with the insulation film.

[0007] In the technical scheme of the embodiment of the application, the battery body comprises an outer side wall and an end wall, wherein the outer side wall is a side surface in the length extension direction of the battery body. The patch comprises a first patch part and a second patch part connected together, the first patch part covers the entire range of the end wall to ensure the fixation of the positive and negative electrode parts and the insulation of the end wall area. The second patch part extends from the end wall to the outer side wall and covers at least part of the outer side wall, and the second patch part is connected with the insulating film. The insulating film covers at least part of the outer side wall. In this way, the area where the patch and the insulating film are connected is arranged in the outer side wall area of the battery body, so that the patch and the insulating film are connected to form a complete insulating layer outside the battery body, and the bending of the insulating film to the top cover end surface part is cancelled, thereby avoiding the problem of the rebounding of the insulating film and ensuring the reliable external insulation of the battery monomer. The area where the patch and the insulating film are connected is arranged in the outer side wall area of the battery body, and other structural parts for preventing the insulating film from being raised are cancelled on the patch, so that the first patch part of the patch is relatively flat, which is beneficial to the assembly of the battery monomer in the box of the battery device.

[0008] In some embodiments of the application, the second patch part and the insulating film have an overlapping area in the thickness direction of the second patch part.

[0009] Here, the contact area of the patch and the insulating film is increased, so that the rebound of the insulating film in the overlapping area is effectively suppressed to better prevent the insulating film from being raised and ensure the reliable external insulation of the battery monomer.

[0010] In some embodiments of the application, in the overlapping area, the insulating film is located between the second patch part and the battery body.

[0011] Here, the second patch part applies uniform pressure to the insulating film, disperses mechanical stress by increasing the contact area, and avoids local warping of the insulating film caused by thermal expansion or assembly errors. In terms of simplifying the assembly process, this design does not need additional hot melting process to fix the insulating film, but can realize reliable bonding through physical lamination, thereby reducing the risk of short circuit caused by hot melting damage.

[0012] In some embodiments of the application, the side of the insulating film facing the patch extends to the inside of the second patch part and is attached to the outer side wall of the battery body.

[0013] Here, the second patch part covers the insulating film to form a double constraint, disperses assembly stress by increasing the contact area, and reduces the problem of local edge lifting of the insulating film caused by thermal expansion or mechanical vibration.

[0014] In some embodiments of the application, the side of the insulating film facing the patch extends to the inside of the first patch part and is attached to the end wall of the battery body.

[0015] Here, the insulating film extends from the outer side wall to the end wall, so that the second attaching part and the insulating film achieve the maximum overlapping range, the contact area is increased to disperse the assembly stress, the local edge lifting problem of the insulating film caused by thermal expansion or mechanical vibration is reduced, and the insulating film extends to the overlapping area of the end wall to further increase the contact area and increase the insulation effect of the outer side wall area of the battery body.

[0016] In some embodiments of the present application, the second attaching part is located between the insulating film and the battery body in the overlapping area.

[0017] Here, while the joint part of the insulating film and the patch is arranged on the outer side wall of the battery body, the assembly process of the insulating film can be reduced, and the second attaching part of the patch can be prevented from damaging the formed structure of the insulating film when the patch is sleeved, so as to better ensure the external insulation reliability of the battery monomer.

[0018] In some embodiments of the present application, the side of the insulating film towards the patch extends to the outside of the second attaching part and is attached to the second attaching part.

[0019] Here, the second attaching part covers the insulating film to form double constraints, the contact area is increased to disperse the assembly stress, the local edge lifting problem of the insulating film caused by thermal expansion or mechanical vibration is reduced, and the external insulation reliability of the battery monomer is ensured.

[0020] In some embodiments of the present application, the battery body is a cuboid structure, the first attaching part is a plate structure, and the second attaching part includes four extended side plates which are connected to the first attaching part perpendicularly and in a head-to-tail manner, the first attaching part covers the end wall of the battery body, and the second attaching part is sleeved outside the outer side wall of the battery body close to the end wall.

[0021] Here, the four extended side plates of the second attaching part are sleeved outside the outer side wall to form a ring-shaped support structure, which can effectively disperse mechanical stress and avoid deformation of the first attaching part caused by external pressure. The first attaching part completely covers the end wall, and cooperates with the sleeving design of the second attaching part to form a double-sealing barrier, thereby reducing the risk of electrolyte leakage and improving the external insulation reliability of the battery monomer. The perpendicular connection design of the four extended side plates simplifies the assembly process, quickly positions without adjusting the angle, and improves the efficiency of the battery modular production.

[0022] In some embodiments of the present application, the four extended side plates are flush on the side away from the first attaching part.

[0023] Here, the flush side plate edge ensures the alignment accuracy during assembly of the battery monomer, reduces the assembly stress concentration problem caused by size deviation. The flush design facilitates stamping or injection molding, reduces the complexity of the mold, and reduces the subsequent trimming process.

[0024] In some embodiments of the present application, the outer side wall of the battery body is provided with an adaptive recess near the end wall, and the second patch covers the adaptive recess.

[0025] Here, the design that the second patch covers the adaptive recess can achieve accurate positioning and avoid stress concentration caused by assembly deviation. Moreover, the adaptive recess can eliminate the thickness of the second patch to some extent, so that the assembly gap is smaller when the battery monomer is assembled in the box of the battery device, and more battery monomers can be assembled to increase the energy density of the battery pack. The adaptive recess is compatible with the standard stamping forming process, and the consistency of the assembly of the second patch and the battery body can be ensured without additional calibration steps.

[0026] In some embodiments of the present application, the depth of the adaptive recess is consistent with the thickness of the second patch, and the outer side surface of the second patch is flush with the outer surface of the outer side wall of the battery body.

[0027] Here, when the patch is assembled in the battery body, the adaptive recess can play a positioning role for the second patch, the outer side surface of the second patch covered in the adaptive recess is flush with the outer surface of the outer side wall, and the second patch is prevented from protruding or sinking into the outer side wall to eliminate the assembly gap of the plurality of battery monomers forming the battery monomer assembly.

[0028] In some embodiments of the present application, there is an adhesive layer between the patch and the battery body, and the adhesive layer adheres the patch and the battery body.

[0029] In some embodiments of the present application, the patch is made of a heat-shrinkable material, and the patch is tightly attached to the battery body by shrinking.

[0030] Here, the heat-shrinkage process does not require complex fixing devices, and can achieve rapid assembly by heating to improve production efficiency. The material shrinkage rate has strong adaptability, which improves the adhesion to the battery body. Specifically, the patch can be selected from one or more combinations of PET, PP, PE, and PVDC.

[0031] In some embodiments of the present application, the thickness of the second patch is less than the thickness of the first patch.

[0032] Here, the second patch is thinned to reduce the overall weight, reduce raw material consumption, and the thinner second patch can better adapt to thermal expansion and contraction or mechanical deformation to avoid cracking and warping caused by stress concentration. The thickness difference of the second patch provided on the outer side wall of the battery body facilitates the adhesion to adjacent components and reduces the assembly gap.

[0033] In some embodiments of the present application, the second patch covers an area range of the surface area of the outer side wall less than or equal to one fifth of the surface area of the outer side wall.

[0034] The second aspect of the application provides a battery device, comprising the battery cell provided in any of the above embodiments.

[0035] In the technical scheme of the embodiment of the application, since the battery cell in any of the above embodiments is included, the same beneficial effects can be achieved. That is, the rebound stress caused by the bending of the extended area of the insulating film can be prevented from causing the insulating film to be seriously lifted and the patch to be lifted, so that the insulation effect of the battery is guaranteed.

[0036] The third aspect of the application provides a power-using equipment, comprising the battery device.

[0037] In the technical scheme of the embodiment of the application, since the battery device is included, the same beneficial effects can be achieved. That is, the rebound stress caused by the bending of the extended area of the insulating film can be prevented from causing the insulating film to be seriously lifted and the patch to be lifted, so that the insulation effect of the battery is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0038] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0039] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0040] Figure 1 The structural schematic diagram of the power-using equipment provided in the embodiment of the application is shown in the figure.

[0041] Figure 2 The explosion schematic diagram of the battery device provided in the embodiment of the application is shown in the figure.

[0042] Figure 3 The explosion schematic diagram of the battery cell provided in the embodiment of the application is shown in the figure.

[0043] Figure 4 The structural schematic diagram of the battery cell provided in the embodiment of the application is shown in the figure.

[0044] Figure 5 The structural schematic diagram of the battery cell provided in the embodiment of the application is shown in the figure.

[0045] Figure 6 The structural schematic diagram of the battery cell provided in the embodiment of the application is shown in the figure.

[0046] Figure 7 The structural schematic diagram of the patch of the battery cell provided in the embodiment of the application is shown in the figure.

[0047] Figure 8 A structural schematic diagram of a battery body of a battery cell provided in an embodiment of the present application;

[0048] Figure 9 A structural schematic diagram of an insulating film of a battery cell provided in an embodiment of the present application;

[0049] Figure 10 A structural schematic diagram of an insulating film of a battery cell provided in an embodiment of the present application.

[0050] Explanation of reference signs:

[0051] 1000 - electrical equipment; 100 - battery device; 110 - battery cell; 200 - controller; 300 - motor;

[0052] 1 - battery body; 11 - outer side wall; 111 - fitting recess; 12 - end wall; 2 - insulating film; 3 - patch; 31 - first patch part; 311 - pole hole; 312 - pressure relief hole; 32 - second patch part; 321 - extension side plate; 4 - top cover; 5 - positive electrode adapter plate; 6 - negative electrode adapter plate; 7 - bottom support plate; 8 - Mylar film; 9 - lead shell. DETAILED DESCRIPTION

[0053] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0058] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0060] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0061] The following is a detailed description of this application.

[0062] With the continuous popularization of new energy vehicles and energy storage systems, more and more secondary batteries are applied, and the requirements for safety, energy density and other indicators are getting higher and higher. In order to ensure the insulation reliability of the battery, a layer of insulating film is usually wrapped in the main area of the secondary battery, and a layer of insulating patch is pasted on the top surface of the battery. The usual insulating film will extend to the top cover area and be covered by the patch, but the rebound stress caused by the bending of the extended area of the insulating film will cause the insulating film to be severely warped and the patch to be lifted, resulting in that the insulation effect of the battery cannot be guaranteed.

[0063] With the development of batteries, various irregular shapes and extremely thin thicknesses of batteries are also constantly emerging, and the rebound problem caused by the bending of the extended area of the insulating film is becoming more and more prominent. Moreover, the difficulty of wrapping the irregular battery film is getting higher and higher, and the extended bending area cannot match the safety and manufacturing requirements in many cases.

[0064] Based on such a design concept, the battery monomer, battery device and electric equipment provided by the present application can prevent the rebound stress caused by the bending of the extended area of the insulating film from causing the insulating film to be severely warped and the patch to be lifted, so that the insulation effect of the battery is guaranteed.

[0065] Specifically, referring to the drawings, the present application provides a battery monomer, which comprises a battery body 1, an insulating film 2 and a patch 3. The battery body 1 comprises an outer side wall 11 and an end wall 12. The insulating film 2 covers at least part of the outer side wall 11. The patch 3 comprises a first patch part 31 and a second patch part 32 connected together. The first patch part 31 covers the end wall 12, and the second patch part 32 extends from the end wall 12 to the outer side wall 11 and covers at least part of the outer side wall 11. The second patch part 32 is in contact with the insulating film 2.

[0066] In the technical scheme of the embodiment of the present application, the patch 3 comprises the first patch part 31 and the second patch part 32 connected together, and the second patch part 32 extends from the end wall 12 to the outer side wall 11, so that the patch is designed as a head cover type structure, and the overlapping area of the patch 3 and the insulating film 2 is arranged in the outer side wall 11 area of the battery body 1. In this way, the part of the insulating film 2 located near the end wall 12 of the outer side wall 11, the part of the insulating film 2 bent to the end wall 12, and the bending angle parts of the two are all limited by the patch 3, thereby avoiding the problem of rebound and warping of the insulating film 2. Moreover, the first patch part 31 covers the end wall 12 and forms an integral structure with the second patch part 32, so that the outer surface of the battery monomer is relatively flat, so as to facilitate the assembly of more battery monomers in the same volume of the battery device, thereby increasing the energy density of the battery device.

[0067] The embodiments of the present application also provide a battery apparatus, which can be a battery pack. The battery pack includes a box body and one or more battery cell assemblies accommodated in the box body. The battery cell assembly can include a plurality of battery cells connected in series, in parallel or in a mixed manner by a busbar component. The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies to provide voltage and capacity.

[0068] The embodiments of the present application also provide a power consuming device including the battery apparatus for providing electric energy. The power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0069] In the following embodiments, the power consuming device of an embodiment of the present application is taken as a vehicle for illustration.

[0070] Figure 1 The power consuming device 100 provided by some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. As shown in Figure 1 The vehicle can include a battery apparatus 100, which can be arranged at the bottom, the head or the tail of the vehicle. The battery apparatus 100 can be used for power supply of the vehicle, for example, the battery apparatus 100 can be used as an operating power source of the vehicle. The vehicle can also include a controller 200 and a motor 300. The controller 200 is used to control the battery apparatus 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle during starting, navigation and driving.

[0071] In some embodiments of the present application, the battery apparatus 100 can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0072] Figure 2An exploded view of a battery apparatus 100 is provided for some embodiments of the present application; the battery apparatus 100 referred to in embodiments of the present application can also include one or more battery cell assemblies (not shown in the figure, please refer to the combination of the plurality of battery cells 110) for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 110, which are connected in series, in parallel, or in a mixed connection through a busbar component.

[0073] Figure 3 An exploded view of a battery cell 110 is provided for embodiments of the present application; the battery cell 110 of the present disclosure includes an insulating film 2, a patch 3, a top cover 4, a positive electrode adapter 5, a negative electrode adapter 6, a jelly-roll, a bottom support plate 7, a Mylar film 8, and a lead shell 9. The above-mentioned components are not essential components for defining the battery cell of the present application, and can be omitted or replaced as appropriate.

[0074] In embodiments of the present application, the battery cell 110 can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging the battery cell 110.

[0075] The battery cell 110 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the present application is not limited thereto.

[0076] In addition, by way of example, the battery cell 110 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc., and the present application is not particularly limited.

[0077] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; by way of example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. By way of example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0078] In some embodiments, the battery apparatus can be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0079] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0080] As an example, the battery cell assembly can also be accommodated in the box by fixing a plurality of battery cells 110 directly in the box.

[0081] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0082] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0083] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0084] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0085] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0086] The embodiments of the present application also provide an electric device, which includes the above-mentioned battery device for providing electric energy. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spaceship, etc.

[0087] In the following, the embodiments of the present application will be described in detail with reference to the accompanying drawings. Figures 3 to 10 The embodiments of the present application will be described in detail.

[0088] The application provides a battery monomer, comprising a battery body 1, an insulating film 2, and a patch 3.

[0089] The battery body 1 is used for providing voltage and capacity. The battery body 1 can be composed of a plurality of battery cells or jelly-rolls. Figure 3 Figure 3 As shown in the explosion schematic diagram of the battery monomer provided by the embodiment of the application, two jelly-rolls are arranged, and the two jelly-rolls constitute one battery body 1.

[0090] The insulating film 2 (PET) is used for insulating the battery body 1 and covers the outermost part of the battery body 1. Figure 3 As shown in the explosion schematic diagram of the battery monomer provided by the embodiment of the application, two jelly-rolls are arranged, and the two jelly-rolls constitute one battery body 1.

[0091] The patch 3 has an insulating property and is used for fixing electrolyte, positive and negative electrodes and other components in the lithium battery. Pole holes 311 are arranged on the patch and are used for passing the positive and negative pole columns. The pole hole 311 of the positive pole column is in conduction with the patch (matches the potential of the aluminum shell), and the pole hole 311 of the negative pole column needs to be insulated. A pressure relief hole 312 (safety valve hole) is connected with the explosion-proof device of the top cover 4 and is used for releasing the internal pressure and preventing the battery from exploding. A liquid injection hole, an identification code / label hole and a process hole can also be arranged. The liquid injection hole is closed by a sealing nail (such as a rubber plug) after liquid injection, so as to ensure the air tightness when the electrolyte is filled. The identification code / label hole is used for laser printing of the battery code or polarity label, so as to avoid the decrease of the insulating property caused by the traditional windowing. The process hole is a passing hole for assisting the assembly of the pole column and can be combined with a riveting structure to improve the connection reliability.

[0092] In the technical scheme of the embodiment of the application, as shown in Figure 3 ​As shown, the battery body 1 includes an outer side wall 11 and an end wall 12, wherein the outer side wall 11 is the side surface in the length extension direction of the battery body 1. According to different shapes of the battery body 1, the side surface can be an integral arc surface, or a circumferentially closed side surface formed by a plurality of planes. The patch 3 includes a first patch portion 31 and a second patch portion 32 connected together, the first patch portion 31 covers the entire range of the end wall 12 to ensure the fixation of the positive and negative electrodes and the like and the insulation of the area of the end wall 12. The second patch portion 32 extends from the end wall 12 to the outer side wall 11 and covers at least part of the outer side wall 11, and the second patch portion 32 is in contact with the insulating film 2. The insulating film 2 covers at least part of the outer side wall 11. In this way, the patch 3 itself has an insulating effect, and the area where the patch 3 is in contact with the insulating film 2 is arranged in the area of the outer side wall 11 of the battery body 1, and the contact of the patch 3 and the insulating film 2 can form a complete insulating layer outside the battery body 1, eliminating the need to bend the insulating film 2 to the end face portion of the top cover 4, thereby avoiding the problem of the insulating film 2 rebounding and buckling, and ensuring the reliable external insulation of the battery monomer. The area where the patch 3 is in contact with the insulating film 2 is arranged in the area of the outer side wall 11 of the battery body 1, eliminating the need for other structural members on the patch 3 to prevent the insulating film 2 from buckling, making the first patch portion 31 of the patch 3 relatively flat, which is conducive to the assembly of the battery monomer in the box of the battery device.

[0093] It should be noted that according to the placement mode of the battery monomer, for example, the battery monomer is placed vertically, that is, the end face of the side where the pole is arranged is the top face, and the opposite side is the bottom face. Then the end wall 12 of the present disclosure is the top face and the bottom face as described above. The patch 3 of the present disclosure can cover the top face and / or the bottom face, that is, when the patch 3 is located on the top face, it can be named as a top patch, and when the patch 3 is located on the bottom face, it can be named as a bottom patch. It can be understood that the first patch portion 31 of the present disclosure is the part covering the end wall 12 (top face and / or bottom face), and the second patch portion 32 is the part extending from the end wall 12 (top face and / or bottom face) to the outer side wall 11. The present disclosure specifically covers the first patch portion 31 on the side of the battery monomer where the pole is arranged, that is, the second patch portion 32 extends from the top side to the bottom side.

[0094] In some embodiments of the present application, the second patch portion 32 and the insulating film 2 have an overlapping area in the thickness direction of the second patch portion 32.

[0095] The second attaching part 32 extends to the outer side wall 11, and the second attaching part 32 and the insulating film 2 have an overlapping area in the thickness direction of the second attaching part 32. The insulating film 2 can completely overlap the second attaching part 32, or partially overlap the second attaching part 32. In the embodiment in which the insulating film 2 completely overlaps the second attaching part 32, the contact area of the insulating film 2 and the second attaching part 32 is maximized to achieve the best edge lifting prevention effect; in the embodiment in which the insulating film 2 partially overlaps the second attaching part 32, the use of the insulating film 2 can be saved to save costs, and the assembly reduces the assembly difficulty. Here, the contact area of the patch 3 and the insulating film 2 is increased, so that the rebound of the insulating film 2 in the overlapping area is effectively suppressed to better prevent the insulating film from lifting and ensure the external insulation reliability of the battery monomer.

[0096] In some embodiments of the present application, the insulating film 2 is located between the second attaching part 32 and the battery body 1 in the overlapping area.

[0097] The insulating film 2 is located between the second attaching part 32 and the battery body 1 in the overlapping area, that is, in the overlapping area, the second attaching part 32 is located outside the insulating film 2, and the insulating film 2 is pressed on the outer side wall 11 of the battery body 1 by the second attaching part 32. Here, the second attaching part 32 applies uniform pressure to the insulating film 2, disperses mechanical stress by increasing the contact area, and avoids local warping of the insulating film due to thermal expansion or assembly errors. In terms of simplifying the assembly process, this design does not require additional hot melting process to fix the insulating film 2, but can achieve reliable bonding through physical lamination, reducing the risk of short circuit caused by hot melting damage.

[0098] In some embodiments of the present application, the side of the insulating film 2 facing the patch 3 extends to the inner side of the second attaching part 32 and is attached to the outer side wall 11.

[0099] The side of the insulating film 2 facing the patch 3 extends to the inner side of the second attaching part 32 and is attached to the outer side wall 11. The inner side of the second attaching part 32 is the side close to the outer side wall 11 of the battery body 1, and the outer side is the side opposite to the inner side, that is, the outer surface of the second attaching part 32. The extension length of the insulating film 2 can be a partial range or the entire range covering the inner side of the second attaching part 32, and when the insulating film 2 extends to the entire range of the second attaching part 32, that is, the insulating film 2 extends to the edge where the outer side wall 11 meets the end wall 12, it is the maximum overlapping range of the insulating film 2 and the second attaching part 32. Here, the second attaching part 32 covers the insulating film 2 to form a double constraint, disperses assembly stress by increasing the contact area, and reduces the problem of local edge lifting of the insulating film 2 caused by thermal expansion or mechanical vibration.

[0100] In some embodiments of the present application, the side of the insulating film 2 facing the patch 3 extends to the inner side of the first attaching part 31 and is attached to the end wall 12.

[0101] AsFigure 10 As shown, Figure 10 The second structure diagram of the insulating film of the battery cell provided by the embodiment of the application is shown in FIG. 2. The side of the insulating film 2 facing the patch 3 extends to the inner side of the first patch part 31 and covers the edges of the outer side wall 11 and the end wall 12 of the battery body 1, that is, the insulating film 2 is folded after extending out of the range of the outer side wall 11 of the battery body 1, and then is attached to the end wall 12. The attachment range of the insulating film 2 to the end wall 12 of the battery body 1 can be partial attachment and full attachment. It can be understood that the end wall 12 of the battery body 1 has a pole and other components, and the full attachment of the embodiment excludes the position of the pole and other components. Specifically, when the attachment range of the insulating film 2 to the end wall 12 of the battery body 1 is partial attachment, the overlapping width B of the insulating film 2 and the first patch part 31 in the area of the end wall 12 is 0.5-500mm, and the application specifically selects 0.1mm-10mm. Here, the insulating film 2 extends from the outer side wall 11 to the end wall 12, so that the second patch part 32 and the insulating film 2 achieve the maximum overlapping range, the contact area is increased to disperse the assembly stress, the local edge lifting problem of the insulating film 2 caused by thermal expansion or mechanical vibration is reduced, and the insulating film 2 extends to the overlapping area of the end wall 12 and expands to the first patch part 31, further increasing the contact area and increasing the insulation effect of the area of the outer side wall 11 of the battery body 1.

[0102] In some embodiments of the application, in the overlapping area, the second patch part 32 is located between the insulating film 2 and the battery body 1.

[0103] The second patch part 32 is located between the insulating film 2 and the battery body 1, that is, the insulating film 2 covers the outside of the second patch part 32. Here, when the joint part of the insulating film 2 and the patch 3 is arranged on the outer side wall 11 of the battery body 1, the assembly process of the insulating film 2 can be reduced, and the second patch part 32 of the patch 3 does not damage the formed structure of the insulating film when the patch 3 is sleeved, which better guarantees the external insulation reliability of the battery cell.

[0104] In some embodiments of the application, the side of the insulating film 2 facing the patch 3 extends to the outside of the second patch part 32 and is attached to the second patch part 32.

[0105] As Figure 3As shown, the side of the insulating film 2 facing the patch 3 extends to the outside of the second patch 32 and is attached to the second patch 32. In the design state, the extension length of the insulating film 2 can extend to the entire range outside the second patch 32, but the edge of the insulating film 2 should not be delaminated or warped from the edge of the second patch 32, which requires a higher assembly process. Therefore, the extension length of the insulating film 2 is extended to part of the second patch 32, that is, the extended edge of the insulating film 2 is spaced apart from the edge of the second patch 32 close to the first patch 31. Here, the coverage of the second patch 32 to the insulating film 2 forms a double constraint, which disperses the assembly stress by increasing the contact area and reduces the problem of local edge warping of the insulating film 2 caused by thermal expansion or mechanical vibration, thereby ensuring the external insulation reliability of the battery cell.

[0106] In some embodiments of the present application, the battery body 1 is a cuboid structure, the first patch 31 is a plate structure, and the second patch 32 includes four extension side plates 321. The four extension side plates are connected end to end and are all connected perpendicularly to the first patch 31. The first patch 31 covers the end wall 12, and the second patch 32 is sleeved outside the outer side wall 11 close to the end wall 12.

[0107] The first patch 31 is a plate structure, and the second patch 32 includes four extension side plates 321. The four extension side plates are connected end to end and are all connected perpendicularly to the first patch 31. The first patch 31 covers the end wall 12, and the second patch 32 is sleeved outside the outer side wall 11 close to the end wall 12. The extension side plate 321 can be provided as a rectangular plate body with a flat outer surface, so that the appearance of the battery cell is flat, thereby reducing the assembly gap of multiple battery cells. For example, a square, a cuboid, or other polygonal plate body. In the present application, the first patch 31 is provided as a rectangular plate body, and the four extension side plates 321 are specifically provided as four rectangular plate bodies. Here, the four extension side plates 321 of the second patch 32 are sleeved outside the outer side wall 11 to form a ring-shaped support structure, which can effectively disperse mechanical stress and prevent the first patch 31 from being deformed due to external pressure. The first patch 31 completely covers the end wall 12, and cooperates with the sleeving design of the second patch 32 to form a double-sealing barrier, thereby reducing the risk of electrolyte leakage and improving the external insulation reliability of the battery cell. The perpendicular connection design of the four extension side plates 321 simplifies the assembly process, which can be quickly positioned without adjusting the angle, thereby improving the efficiency of battery modular production.

[0108] In some embodiments of the present application, the four extension side plates 321 are flush away from the side of the first patch 31.

[0109] Four extended side plates 321 are flush with the side of the first adhesive portion 31. Here, the flush side plate edges ensure the alignment accuracy of the battery cell during assembly, reducing the problem of stress concentration caused by dimensional deviation. The flush design facilitates stamping or injection molding, reducing the complexity of the mold, and reducing the subsequent trimming process.

[0110] In some embodiments of the present application, the outer side wall 11 is provided with an adaptive recess 111 near the end wall 12, and the second adhesive portion 32 covers the adaptive recess 111.

[0111] The adaptive recess 111 is provided on the outer side wall 11 of the battery body 1. As shown in Figure 7 , Figure 7 The structure diagram of the battery body of the battery cell provided in the embodiments of the present application, the adaptive recess 111 can be provided as a gap structure opened downward from the end wall 12, that is, the side of the battery body 1 near the end wall 12 is smaller in diameter than other parts, wherein the size of the smaller diameter is greater than or equal to the size of the second adhesive portion 32, so that the second adhesive portion 32 can be completely covered in the adaptive recess 111. Here, the design of the second adhesive portion 32 covering the adaptive recess 111 can achieve accurate positioning and avoid the problem of stress concentration caused by assembly deviation. Moreover, the adaptive recess 111 can eliminate the thickness of the second adhesive portion 32 to a certain extent, so that the assembly gap is smaller when the battery cell is assembled in the box of the battery device, and more battery cells can be assembled to increase the energy density of the battery pack. The adaptive recess 111 is compatible with the standard stamping molding process, and the consistency of the assembly of the second adhesive portion 32 and the battery body 1 can be ensured without additional calibration steps.

[0112] In some embodiments of the present application, the depth of the adaptive recess 111 is consistent with the thickness of the second adhesive portion 32, and the outer side surface of the second adhesive portion 32 is flush with the outer surface of the outer side wall 11.

[0113] The outer side surface of the second patch portion 32 is flush with the outer surface of the outer side wall 11, so that the second patch portion 32 does not protrude or recess from the outer side wall 11. In terms of the connection between the second patch portion 32 and the outer side wall 11, the connection can be achieved by gluing or heat shrinking. The above connection methods have different assembly tolerances for different battery cell models. For example, the thickness of the glue is certain. If the thickness of the glue for a battery cell with a larger size is increased, the thickness of the glue also needs to be considered in the thickness of the second patch portion 32 or the fitting recess 111. For example, an adhesive layer is arranged on the inner side of the second patch portion 32 or in the fitting recess 111, and the adhesive layer is part of the thickness of the second patch portion 32 or the depth of the fitting recess 111. Here, when the patch 3 is assembled on the battery body 1, the fitting recess 111 can function as a positioning of the second patch portion 32, and the outer side surface of the second patch portion 32 covered in the fitting recess 111 is flush (coplanar) with the outer surface of the outer side wall 11, preventing the second patch portion 32 from protruding or recessing into the outer side wall 11, so as to eliminate the assembly gap of the plurality of battery cells forming the battery cell assembly.

[0114] In some embodiments of the present application, an adhesive layer is arranged between the patch 3 and the battery body 1, and the adhesive layer bonds the patch 3 and the battery body 1. Specifically, the material of the patch 3 can be mica.

[0115] The adhesive layer between the patch 3 and the battery body 1 can be epoxy resin glue, which has high strength, high and low temperature resistance, and chemical corrosion resistance. Alternatively, silicone glue can be used, which has flexibility and weather resistance, and can better buffer stress to prevent the patch 3 from being peeled off.

[0116] In some embodiments of the present application, the patch 3 is made of heat-shrinkable material, and the patch 3 is tightly attached to the battery body 1 by shrinking.

[0117] The patch 3 is connected to the battery body 1 by using heat-shrinkable material. After shrinking, the heat-shrinkable material forms a tight fit with the battery body 1, which can effectively disperse mechanical stress and reduce the risk of the patch falling off due to vibration or impact. Here, the heat-shrinking process does not require complex fixing devices, and can achieve rapid assembly by heating, thereby improving production efficiency. The material shrinkage rate has strong self-adaptability, which improves the fit with the battery body 1. Specifically, the patch 3 can be made of one or a combination of PET, PP, PE, and PVDC.

[0118] In some embodiments of the present application, the thickness of the second patch portion 32 is less than the thickness of the first patch portion 31.

[0119] The second attaching part 32 is thinned to reduce the overall weight and the consumption of raw materials, and the thinner second attaching part 32 can better adapt to thermal expansion and contraction or mechanical deformation to avoid cracking and warping caused by stress concentration. The second attaching part 32 is arranged on the outer side wall of the battery body 1 to facilitate the attachment of adjacent components and reduce assembly gaps. Further, the thickness ratio of the first attaching part 31 to the second attaching part 32 is 1:0.4. Specifically, the thickness of the second attaching part 32 is 45 microns (μm) to 55 microns (μm). The thickness of the second attaching part 32 is 45 microns to 55 microns to balance the insulation strength and flexibility. When the thickness of the second attaching part 32 is less than 45 microns, the insulation performance decreases, which may result in insufficient voltage resistance, and the thinned part is prone to local insulation failure. When the thickness of the second attaching part 32 is greater than 55 microns, the increased weight may affect the overall lightweight structure, and the increased material consumption may affect the space utilization. The thickness of the second attaching part 32 is 45 microns to 55 microns to balance the insulation and mechanical requirements.

[0120] In some embodiments of the present application, the second attaching part 32 covers a surface area of the outer side wall 11 that is less than or equal to one fifth of the surface area of the outer side wall 11.

[0121] The second attaching part 32 covers a surface area of the outer side wall 11 that is less than or equal to one fifth of the surface area of the outer side wall 11. When the covered area exceeds one fifth of the height of the outer side wall 11, the increased weight may affect the overall lightweight structure, and the material is wasted. When the covered area is less than one fifth of the height of the outer side wall 11, in embodiments where the second attaching part 32 overlaps the insulating film 2, the overlapping area is small, which is not conducive to the outer attachment or embedding of the insulating film 2. Specifically, as shown in Figure 8 Figure 8 The second attaching part 32 extends from the first attaching part 31 to the outer side wall 11 by 1 millimeter to 500 millimeters, preferably 0.1 millimeter to 50 millimeters.

[0122] The second aspect of the present application provides a battery device comprising the battery monomer provided in any of the embodiments.

[0123] In the technical solution of the embodiments of the present application, the battery monomer in any of the embodiments is included, so the same beneficial effects can be achieved. That is, the rebound stress caused by the bending of the insulating film extension area can be prevented to cause the insulating film to be severely warped and the patch to be lifted, so that the insulation effect of the battery is guaranteed.

[0124] The third aspect of the present application provides a power consumption device comprising the battery device.

[0125] ​In the technical scheme of the embodiment of the present application, because the battery device is included, the same beneficial effects can be achieved. That is, the rebound stress caused by the bending of the insulating film extension area can be prevented from causing the insulating film to be seriously lifted and the patch to be lifted, so that the battery insulation effect is guaranteed.

[0126] The above description is merely that of the specific embodiments of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cell, characterized by, The battery cell comprises: a battery body comprising an outer side wall and an end wall; an insulating film covering at least a portion of the outer side wall; a patch comprising a first patch portion and a second patch portion connected together, the first patch portion covering the end wall, the second patch portion extending from the end wall to the outer side wall and covering at least a portion of the outer side wall, the second patch portion being in contact with the insulating film.

2. The battery cell of claim 1, wherein, The second patch portion and the insulating film have an overlapping area in the thickness direction of the second patch portion.

3. The battery cell of claim 2, wherein, In the overlapping area, the insulating film is located between the second patch portion and the battery body.

4. The battery cell of claim 3, wherein, The insulating film extends to the inside of the second patch portion towards the side of the patch and is in contact with the outer side wall.

5. The battery cell of claim 4, wherein, The insulating film extends to the inside of the first patch portion towards the side of the patch and is in contact with the end wall.

6. The battery cell of claim 2, wherein, In the overlapping area, the second patch portion is located between the insulating film and the battery body.

7. The battery cell of claim 6, wherein, The insulating film extends to the outside of the second patch portion towards the side of the patch and is in contact with the second patch portion.

8. The battery cell of claim 1, wherein, The battery body has a cuboid structure, the first patch portion has a plate structure, the second patch portion comprises four extension side plates, the four extension side plates are connected end to end and are all connected perpendicularly to the first patch portion, the first patch portion covers the end wall, and the second patch portion is sleeved outside the outer side wall close to the end wall.

9. The battery cell of claim 8, wherein, The four extension side plates are flush on the side away from the first patch portion.

10. The battery cell of claim 1, wherein, The outer side wall is provided with an adaptive recess close to the end wall, and the second patch portion covers the adaptive recess.

11. The battery cell of claim 10, wherein, The depth of the adaptive recess is consistent with the thickness of the second patch portion, and the outer side surface of the second patch portion is flush with the outer surface of the outer side wall.

12. The battery cell of claim 1, wherein, The patch and the battery body have an adhesive layer therebetween, and the adhesive layer bonds the patch and the battery body.

13. The battery cell of claim 1, wherein, The patch is made of heat-shrinkable material, and the patch is tightly attached to the battery body.

14. The battery cell of any one of claims 1 to 13, wherein, The thickness of the second patch portion is less than the thickness of the first patch portion.

15. The battery cell of any one of claims 1 to 13, wherein, The second patch portion covers a surface area of the outer side wall, and the surface area range of the second patch portion is less than or equal to one fifth of the surface area of the outer side wall.

16. A battery device characterized by comprising: The battery cell comprises: The battery cell of any one of claims 1 to 15.

17. An electrical device, characterized by The battery device comprises: The battery device of claim 16 for providing electric energy.

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