Battery cell unit, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery cell unit, a battery and electric equipment, and relates to the technical field of batteries. Each battery cell unit comprises a battery cell and a stretchable and extendable adhesive tape, and the stretchable and extendable adhesive tape wraps the outer surface of the battery cell; the stretchable and extendable adhesive tape has stretchability, extensibility and adhesiveness, and the stretchable and extendable adhesive tape wraps the battery cell, can wrap the positive and negative electrode materials of the battery cell tightly, and increases the restraining force in the battery cell, so as to control the thickness change of the battery cell in the charging and discharging process, thereby achieving the effect of homogenizing the internal stress of the battery. The battery cell unit can improve the wrinkle phenomenon of the battery cell and improve the safety and stability of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery cell unit, a battery and an electrical device. Background Art

[0002] At present, in the battery production process, the stacking process is usually used to complete the battery assembly, that is, the battery cell after stacking is placed in the aluminum shell to complete the battery device. However, when the operator disassembled the fully charged battery (referring to the lithium-ion battery in a fully charged state) to observe the electrode interface, it was found that the battery cell had wrinkles near the aluminum shell side. Such wrinkles may cause damage to the diaphragm inside the battery cell, increase the risk of short circuit or internal thermal runaway of the battery cell, and poor safety; at the same time, it may also cause the performance of the battery cell to weaken, making it more vulnerable to damage under external stress such as vibration, impact or bending, and poor stability.

[0003] Therefore, how to reduce the wrinkling phenomenon of battery cells is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide a battery cell unit, a battery and an electrical device, which can improve the wrinkling phenomenon of the battery cell and enhance the safety and stability of the battery cell.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a battery cell unit, comprising:

[0007] Battery cells; and

[0008] A stretchable adhesive tape is wrapped around the outer surface of the battery core.

[0009] In an optional embodiment, the battery cell is a square battery cell, and the stretchable adhesive tape is wrapped around the four side surfaces of the square battery cell.

[0010] In an optional embodiment, the stretchable adhesive tape includes a stretchable tape and an adhesive layer covering one side of the stretchable tape, and the stretchable tape is wrapped around the side of the battery core so that the adhesive layer adheres to the outer surface of the battery core.

[0011] In an optional embodiment, the material of the stretchable extension band is polyester resin.

[0012] In an optional embodiment, the adhesive layer is made of acrylic glue.

[0013] In an optional embodiment, the stretchable adhesive tape is provided with through holes for electrolyte infiltration.

[0014] In an optional embodiment, there are multiple through holes, and the multiple through holes are arranged in a rectangular array.

[0015] In an optional embodiment, the diameter of the through hole ranges from 1.5 mm to 5 mm.

[0016] In a second aspect, the utility model provides a battery, comprising a shell and a battery cell unit as described in any one of the aforementioned embodiments, wherein the battery cell and the stretchable adhesive tape are both accommodated in the shell.

[0017] In a third aspect, the utility model provides an electrical device, comprising the battery described in the aforementioned embodiment.

[0018] The beneficial effects of the embodiments of the utility model include:

[0019] The battery cell unit includes a battery cell and a stretchable adhesive tape, which is wrapped around the outer surface of the battery cell. Since the stretchable adhesive tape has stretchability, ductility and adhesion, the positive and negative electrode materials of the battery cell can be tightly wrapped by wrapping the battery cell with the stretchable adhesive tape, increasing the restraint force inside the battery cell to control the thickness change of the battery cell during the charging and discharging process, thereby playing a role in homogenizing the internal stress of the battery, thereby improving the phenomenon of wrinkles in the battery cell and improving the safety and stability of the battery cell.

[0020] The battery comprises a shell and a battery cell unit, wherein the battery cell and the stretchable adhesive tape are both contained in the shell. The battery has all the beneficial effects of the battery cell unit.

[0021] The electric device comprises a battery and an electric device, wherein the battery is used to provide electric energy to the electric device. The electric device has all the beneficial effects of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a battery cell unit provided by an embodiment of the utility model from a first perspective;

[0024] Figure 2 A schematic structural diagram of a battery cell unit provided by an embodiment of the utility model from a second viewing angle;

[0025] Figure 3A schematic structural diagram of a stretchable adhesive tape provided in an embodiment of the utility model.

[0026] Icon: 100-battery cell unit; 10-battery cell; 20-stretchable adhesive tape; 21-through hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] As described in the background technology, in the current battery production process, a lamination process is usually used to complete the assembly of the battery, that is, the battery cell after lamination is placed in an aluminum shell to complete the battery device. However, when the operator disassembles a fully charged battery (referring to a lithium-ion battery in a fully charged state) and observes the electrode interface, it is found that the battery cell has wrinkles on the side close to the aluminum shell.

[0034] The inventors have discovered that the reason for this phenomenon is that during the charge and discharge process of the battery cell, the thermal expansion coefficients of the positive and negative electrode materials are inconsistent, and the internal thermal stress is not completely released, resulting in uneven internal stress, leading to wrinkles in the battery poles, and ultimately affecting the stability and safety of the battery cell.

[0035] Based on this, please refer to Figure 1-Figure 3 The embodiment of the utility model provides a battery cell unit 100, a battery and an electric device, which can effectively improve the above-mentioned technical problems, that is, it can improve the wrinkling phenomenon of the battery cell 10 and improve the safety and stability of the battery cell 10. The battery cell unit 100, the battery and the electric device will be described in detail below.

[0036] An embodiment of the utility model provides an electrical device, which includes a battery and other electrical devices. The battery is used to provide electrical energy to the electrical devices, that is, the electrical device uses the battery as a power source.

[0037] The electrical equipment may be, but is not limited to: laptop computers, pen-type computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, LCD TVs, watches, sports bracelets, portable cleaners, portable CD players, transceivers, electronic notepads, calculators, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles, lighting fixtures, toys, game consoles, power tools, flashlights, and lithium-ion capacitors, etc.

[0038] When the electrical device is a vehicle, the vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle, and the battery may be provided at the bottom, head or tail of the vehicle. The battery may be used to power the vehicle, for example, the battery may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery to power the motor, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0039] Specifically, in this embodiment, the battery can be understood as a secondary battery, which can be applied to various fields such as new energy vehicles, energy storage devices and electrical equipment.

[0040] Furthermore, an embodiment of the present invention provides a battery, which includes a housing and a battery cell unit 100 , wherein the battery cell unit 100 is accommodated in the housing.

[0041] Specifically, please refer to Figure 1 , Figure 1 A schematic diagram of the structure of the battery cell unit 100 provided in this embodiment from a first perspective, combined with Figure 1 The battery cell unit 100 includes a battery cell 10 and a stretchable adhesive tape 20, and the stretchable adhesive tape 20 is wrapped around the outer surface of the battery cell 10. Since the stretchable adhesive tape 20 has stretchability, ductility and adhesiveness, the battery cell 10 is wrapped by the stretchable adhesive tape 20, and the positive and negative electrode materials of the battery cell 10 can be tightly wrapped, and the restraining force inside the battery cell 10 is increased to control the thickness change of the battery cell 10 during the charging and discharging process, thereby playing a role in uniformizing the internal stress of the battery, thereby improving the phenomenon of wrinkles in the battery cell 10, and improving the safety and stability of the battery cell 10.

[0042] It should be noted that, in the present embodiment, the battery cell 10 is specifically a square battery cell. Thus, the stretchable adhesive tape 20 is wrapped around the four side surfaces of the square battery cell. By wrapping the four sides of the square battery cell tightly, the restraint force on the positive and negative electrode materials of the battery cell 10 is increased, thereby achieving the effect of homogenizing the internal stress of the battery.

[0043] Of course, in some other embodiments, if the battery cell 10 is a cylindrical battery cell, the stretchable adhesive tape 20 will be wrapped along the circumference of the cylindrical battery cell.

[0044] Further, the stretchable adhesive tape 20 includes a stretchable tape and an adhesive layer covering one side of the stretchable tape, and the stretchable tape is wrapped around the side of the battery cell 10 so that the adhesive layer is bonded to the outer surface of the battery cell 10. It can be understood that when the stretchable tape is wrapped around the side of the battery cell 10, the adhesive layer is located between the battery cell 10 and the stretchable tape.

[0045] It should be noted that, in the present embodiment, the material of the stretchable extension band is specifically polyester resin, which has excellent physical and mechanical properties in a wide temperature range, that is, it has good stretchability and ductility, and can better wrap the battery cell 10, so that the positive and negative electrode materials of the battery cell 10 are restrained and not easy to loosen. At the same time, the polyester resin has excellent electrical insulation, and its electrical performance is still good under high temperature and high frequency, further improving the safety of the battery cell unit 100. Of course, in some other embodiments, the stretchable extension band can also be made of polycarbonate or other materials, as long as it can meet the stretchability and ductility requirements.

[0046] In addition, it should be noted that in this embodiment, the material of the adhesive layer is specifically acrylic glue, which has the characteristics of high strength, solvent resistance, corrosion resistance and high transparency, and can better achieve the bonding and wrapping of the outer surface of the battery cell 10; it should also be pointed out that the acrylic glue can be coated on the stretchable tape in advance to form an adhesive layer, and of course it can also be coated on site when wrapping the battery cell and directly bonded to the outer surface of the battery cell. Of course, in some other embodiments, the material of the adhesive layer can also be glass glue, epoxy resin glue and other types, as long as it can meet the bonding effect of the battery cell 10.

[0047] It is easy to know for those skilled in the art that the battery also includes an electrolyte, which is disposed in the housing. Therefore, in order to facilitate the electrolyte to infiltrate the electrode of the battery cell 10, further, please refer to Figure 2 , Figure 2 A schematic diagram of the structure of the battery cell unit 100 provided in this embodiment from a second perspective, combined with Figure 1 and Figure 2 In this embodiment, the stretchable adhesive tape 20 is provided with a through hole 21 for electrolyte infiltration.

[0048] In order to increase the path for the electrolyte to flow, in this embodiment, the number of through holes 21 is multiple, and the multiple through holes 21 are arranged in a rectangular array. Of course, in other embodiments, the arrangement of the multiple through holes 21 can also be a ring array arrangement or other arrangement forms.

[0049] Specifically, please refer to Figure 3 , Figure 3 The structural diagram of the stretchable adhesive tape 20 provided in this embodiment is shown in FIG. Figure 2 and Figure 3 In the present embodiment, since the battery cell 10 is a square battery cell 10 having four sides, the stretchable adhesive tape 20 is located on two opposite sides thereof and is provided with a plurality of through holes 21. Thus, the electrolyte can infiltrate from the opposite sides of the battery cell 10, thereby improving the infiltration effect.

[0050] Of course, in some other embodiments, multiple through holes 21 can be continuously opened on the stretchable adhesive tape 20, so that the multiple through holes 21 cover the entire periphery of the battery core 10, which can further increase the electrolyte flow path and achieve a better infiltration effect. In addition, the multiple through holes 21 can also be evenly spaced.

[0051] Please continue to combine Figure 2 and Figure 3 In this embodiment, the diameter of the through hole 21 ranges from 1.5 mm to 5 mm, for example, 1.5 mm, 2.5 mm, 3 mm, 3.5 mm, 4.5 mm, 5.0 mm, etc. In this case, the electrolyte infiltration effect is better. Of course, in some other embodiments, the diameter of the through hole 21 can also be other values, which need to be determined according to the actual design requirements of the battery cell 10.

[0052] Through the above description, this embodiment also provides an installation process of a battery cell unit 100:

[0053] S10 Positioning operation: stably placing the stacked battery cells 10 on the work surface, ensuring that the surfaces of the four sides of the battery cells 10 are flat, and ensuring that the overall appearance of the stretchable adhesive tape 20 is neat.

[0054] S20 Wrapping operation: Start wrapping from one side of the battery cell 10, and fit the stretchable adhesive tape 20 with the through hole 21 area to the side of the battery cell 10; pay attention to ensure that the stretchable adhesive tape 20 is tightly fitted to the surface of the battery cell 10 to avoid bubbles or wrinkles.

[0055] S30 stretching operation: while attaching the stretchable adhesive tape 20 to the battery cell 10, appropriately stretch the stretchable adhesive tape 20 to ensure that it tightly covers the surface of the battery cell 10; be careful not to stretch it too much to avoid damaging the stretchable adhesive tape 20 or causing it to lose its adhesion.

[0056] S40: Continue wrapping: Continue to attach the stretchable adhesive tape 20 to the edge of the battery cell 10, gradually moving along the four edges of the battery cell 10; at the corners, the stretchable adhesive tape 20 may be beveled to make it better fit the edge of the battery cell 10.

[0057] S50: Processing the tail end: After the coating is completed, the tail end of the stretchable adhesive tape 20 is cut off, leaving a proper excess length to ensure that the tail end can be fully adhered to the surface of the battery cell 10 to prevent the stretchable adhesive tape 20 from falling off.

[0058] S60 Pressing operation: After the coating is completed, gently press along the surface of the stretchable adhesive tape 20 by hand or a flat tool to ensure that the stretchable adhesive tape 20 is fully fitted to the surface of the battery cell 10 .

[0059] S70 Quality inspection: Finally, check whether the battery cell 10 is evenly and firmly coated.

[0060] In summary, the embodiment of the utility model provides a battery cell unit 100, a battery and an electrical device, wherein the battery cell unit 100 includes a battery cell 10 and a stretchable adhesive tape 20, wherein the stretchable adhesive tape 20 is wrapped around the outer surface of the battery cell 10. Since the stretchable adhesive tape 20 has stretchability, ductility and adhesion, the battery cell 10 is wrapped by the stretchable adhesive tape 20, and the positive and negative electrode materials of the battery cell 10 can be tightly wrapped, and the restraining force inside the battery cell 10 is increased to control the thickness change of the battery cell 10 during the charging and discharging process, thereby playing a role in uniformizing the internal stress of the battery, thereby improving the phenomenon of wrinkles in the battery cell 10, and improving the safety and stability of the battery cell 10.

[0061] In addition, in order to facilitate the electrolyte to infiltrate the pole pieces of the battery cell 10, the stretchable adhesive tape 20 is provided with through holes 21 for electrolyte infiltration; at the same time, in order to increase the path for the electrolyte to flow, the number of through holes 21 is multiple, and the multiple through holes 21 are arranged in a rectangular array.

[0062] The battery comprises a shell and a battery cell unit 100, wherein the battery cell 10 and the stretchable adhesive tape 20 are both accommodated in the shell. The battery has all the functions and beneficial effects of the battery cell unit 100.

[0063] The electric device comprises a battery and an electric device, wherein the battery is used to provide electric energy to the electric device. The electric device has all the functions and beneficial effects of the battery.

[0064] The above description is only a specific embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery cell unit, characterized in that: include: A battery cell (10); and A stretchable adhesive tape (20) is wrapped around the outer surface of the battery core (10).

2. The battery cell unit according to claim 1, characterized in that: The battery core (10) is a square battery core (10), and the stretchable adhesive tape (20) is wrapped around the four side surfaces of the square battery core (10).

3. The battery cell unit according to claim 1, characterized in that: The stretchable adhesive tape (20) comprises a stretchable tape and an adhesive layer covering one side of the stretchable tape, and the stretchable tape is wrapped around the side of the battery core (10) so that the adhesive layer is bonded to the outer surface of the battery core (10).

4. The battery cell unit according to claim 3, characterized in that: The material of the stretchable extension belt is polyester resin.

5. The battery cell unit according to claim 3, characterized in that: The material of the bonding layer is acrylic glue.

6. The battery cell unit according to claim 1, characterized in that: The stretchable adhesive tape (20) is provided with a through hole (21) for electrolyte infiltration.

7. The battery cell unit according to claim 6, characterized in that: The number of the through holes (21) is multiple, and the multiple through holes (21) are arranged in a rectangular array.

8. The battery cell unit according to claim 6, characterized in that: The diameter of the through hole (21) ranges from 1.5 mm to 5 mm.

9. A battery, characterized in that: It comprises a shell and a battery cell unit (100) according to any one of claims 1 to 8, wherein the battery cell (10) and the stretchable adhesive tape (20) are both accommodated in the shell.

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

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