Battery and electronic equipment

Abstract

The utility model provides a battery and an electronic device. The battery comprises a battery cell; the packaging film is limited out of the cavity, the battery cell is arranged in the cavity, the packaging film is fixedly arranged on the battery bin body, the packaging film comprises an installation side, and the side, close to the box body, of the packaging film is the installation side; the fixing glue is arranged on the face, facing the battery bin body, of the installation side so that the packaging film can be fixed to the battery bin body; the buffer glue is arranged on the face, facing the battery cell, of the installation side so that the battery cell can be fixed in the cavity, the buffer glue comprises a base material, a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on one face of the base material, the second adhesive layer is arranged on the other face of the base material, the first adhesive layer comprises a first hot melt adhesive layer, a second hot melt adhesive layer and a first elastic layer, and the second adhesive layer comprises a second hot melt adhesive layer and a second elastic layer. A first hot melt adhesive layer and a second hot melt adhesive layer are arranged on the two faces of the first elastic layer respectively, and the first hot melt adhesive layer is fixedly arranged on the base material. According to the battery provided by the utility model, the battery is not easy to damage when being impacted.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a battery and electronic device. Background Technology

[0002] In lithium battery design, the bare cell is bonded to the packaging film by applying double-sided hot melt adhesive to reduce relative movement of the cell under external forces, thus improving cell safety. Currently, in the field of power or pouch cells, the hot melt adhesive paper mainly used includes a substrate with hot melt adhesive on both sides. This means that even if the adhesive paper is firmly bonded, slight movement of the cell during a drop can directly cause tearing of the outermost aluminum foil layer, posing a safety risk. Especially when conventional hot melt adhesive paper is applied to the side closest to the mounting surface, the shear force is directly transmitted to the outer aluminum foil layer of the bare cell upon drop, causing the aluminum foil surface to tear. Therefore, a battery that is not easily damaged by impact is needed. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery that is not easily damaged when subjected to impact.

[0004] This utility model also proposes an electronic device.

[0005] A battery according to a first aspect of the present invention includes: a battery cell; a packaging film that restricts the battery cell from exiting a cavity, the battery cell being disposed within the cavity, the packaging film including a mounting side; and a buffer adhesive that is disposed on the mounting side facing the battery cell to fix the battery cell within the cavity, the buffer adhesive including a substrate, a first adhesive layer, and a second adhesive layer, the first adhesive layer being disposed on one side of the substrate, the second adhesive layer being disposed on the other side of the substrate, the first adhesive layer including a first hot melt adhesive layer, a second hot melt adhesive layer, and a first elastic layer, the first hot melt adhesive layer and the second hot melt adhesive layer being disposed on both sides of the first elastic layer, the first hot melt adhesive layer being fixedly disposed on the substrate.

[0006] The battery according to the first aspect of this utility model has at least the following beneficial effects: When the battery is impacted, the first elastic layer provides good cushioning, absorbing a significant amount of impact force. This prevents the battery cell from detaching from the packaging film and from tearing the packaging film. Furthermore, during battery use, the battery cell expands and contracts; the elastic layer not only absorbs the internal stress between the packaging film and the battery cell but also prevents cavities from forming between them.

[0007] According to some embodiments of the present invention, the second adhesive layer includes a third hot melt adhesive layer, a fourth hot melt adhesive layer, and a second elastic layer. The second elastic layer is provided with a third hot melt adhesive layer and a fourth hot melt adhesive layer on both sides, and the third hot melt adhesive layer is fixedly disposed on the substrate.

[0008] According to some embodiments of the present invention, the cavity is provided with a plurality of sides, and at least one side adjacent to the side of the mounting side facing the battery cell is provided with a buffer adhesive, the buffer adhesive on the side being used to fix the battery cell on the side.

[0009] According to some embodiments of the present invention, a back-side surface is provided inside the cavity, which is opposite to the side of the mounting side facing the battery cell. A connecting adhesive is provided on the back-side surface to fix the battery cell on the back-side surface.

[0010] According to some embodiments of the present invention, the first elastic layer is polyurethane foam.

[0011] According to some embodiments of this utility model, the packaging film is an aluminum-plastic film.

[0012] According to some embodiments of the present invention, the first elastic layer includes a compressed state and an expanded state. When the first elastic layer is in the compressed state, the thickness of the first elastic layer is not greater than 10 μm; when the first elastic layer is in the expanded state, the thickness of the first elastic layer is not less than 100 μm.

[0013] According to some embodiments of the present invention, the thickness of the first hot melt adhesive layer is not greater than 5 μm and not less than 1 μm, and the thickness of the second hot melt adhesive layer is not greater than 10 μm and not less than 5 μm.

[0014] According to the second aspect of the present invention, in the electronic device, the side of the battery compartment near the mounting side is a mounting surface, including a fixing adhesive and a battery as described in any of the above embodiments. The fixing adhesive is disposed on the side of the mounting side facing the mounting surface so as to fix the packaging film on the mounting surface.

[0015] According to some embodiments of this utility model, the area where the mounting side and the fixing adhesive adhere is a fixed area, the projected area of ​​the buffer adhesive on the mounting side is A, and the projected area of ​​the fixed area on the mounting side is B, where A≤B.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a battery mounted on a battery compartment according to the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of one embodiment of the buffer adhesive for a battery according to the present invention;

[0019] Figure 3 This is a schematic diagram of another embodiment of the buffer adhesive for a battery according to the present invention.

[0020] Icon labels:

[0021] 1. Battery compartment; 2. Battery cell; 3. Packaging film; 31. Mounting side; 32. Back side; 33. Side; 4. Buffer adhesive; 41. Substrate; 42. First adhesive layer; 421. First hot melt adhesive layer; 422. Second hot melt adhesive layer; 423. First elastic layer; 43. Second adhesive layer; 431. Third hot melt adhesive layer; 432. Fourth hot melt adhesive layer; 433. Second elastic layer; 5. Connecting adhesive; 6. Fixing adhesive. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the orientation descriptions, such as up and down, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0025] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0026] The development and application prospects of built-in batteries are broad and dynamic. In recent years, with the application of new materials and the continuous optimization of battery management systems, the energy density of built-in batteries has significantly improved. This means that batteries can store more electrical energy within the same volume or weight, thus providing users with longer usage time. This advancement is particularly important for various portable electronic devices, such as laptops and smartphones, greatly enhancing the user experience. Long-life design of built-in batteries is also a key development direction. By improving the internal chemical structure and manufacturing process of the battery, and introducing intelligent charging protection mechanisms, new built-in batteries can effectively reduce losses during charge-discharge cycles, extending the overall battery life. This not only reduces user maintenance costs but also reduces environmental pollution, aligning with the current global advocacy of green and low-carbon living. In terms of applications, built-in batteries are widely used in computers, routers, smart home devices, and many other electrical appliances. Built-in batteries provide convenient power backup for these devices, preventing data loss or equipment damage due to sudden power outages. Especially in important situations, such as medical equipment and traffic lights, the protection provided by built-in batteries is particularly crucial. Looking to the future, the development prospects of built-in batteries remain broad. With the rapid development of technologies such as artificial intelligence and the Internet of Things, built-in batteries will become more intelligent. For example, by integrating advanced sensors and algorithms, batteries can monitor their own health status and usage in real time, providing users with accurate power predictions and charging suggestions. Simultaneously, built-in batteries will intelligently collaborate with other components of electronic devices to achieve more efficient energy management and distribution. In conclusion, the development and application prospects of built-in batteries are full of both opportunities and challenges. With continuous technological progress and innovation, built-in batteries will play an increasingly important role in portable electronic devices, smart homes, medical devices, and other fields, bringing greater convenience and security to people's lives.

[0027] Reference Figure 1 and Figure 2The battery in the first embodiment of this utility model is used to be installed on the mounting surface of the battery compartment 1. The battery includes: a battery cell 2, a packaging film 3, and a buffer adhesive 4. The packaging film 3 restricts the battery cell 2 from the cavity. The packaging film 3 is fixedly installed on the battery compartment 1. The packaging film 3 includes a mounting side 31, which is the side of the packaging film 3 closest to the housing. The packaging film 3 is fixed on the battery compartment 1. The buffer adhesive 4 is disposed on the mounting side 31 facing the battery cell 2 so that the battery cell 2 is fixed in the cavity. The buffer adhesive 4 includes a substrate 41, a first adhesive layer 42, and a second adhesive layer 43. The first adhesive layer 42 is disposed on one side of the substrate 41, and the second adhesive layer 43 is disposed on the other side of the substrate 41. The first adhesive layer 42 includes a first hot melt adhesive layer 421, a second hot melt adhesive layer 422, and a first elastic layer 423. The first elastic layer 423 has the first hot melt adhesive layer 421 and the second hot melt adhesive layer 422 respectively disposed on both sides. The first hot melt adhesive layer 421 is fixedly installed on the substrate 41. The specific battery can be installed in the battery compartment 1 of various electrical appliances to power the appliance. To secure the battery, it is fixed to the battery compartment 1, which can be done by adhesive bonding, welding, or other methods. At this time, the packaging film 3 is fixed to the battery compartment 1, and the battery cell 2 is placed inside the packaging film 3. When the appliance is dropped or impacted, the battery cell 2, being heavier, will exert a significant tearing force on the packaging film 3 due to inertia. Therefore, a buffer adhesive 4 is placed between the packaging film 3 and the battery cell 2, and a substrate 41 is placed within the buffer adhesive 4, giving the buffer adhesive 4 strong structural strength. Simultaneously, the substrate 41 provides an adhesion base for the first adhesive layer 42 and the second adhesive layer 43, thus providing the buffer adhesive 4 with a stable structural foundation. The first adhesive layer 42 allows the buffer adhesive 4 to be fixedly adhered to the packaging film 3, and the second adhesive layer 43 allows the buffer adhesive 4 to be fixedly adhered to the battery cell 2, thereby securing the battery cell 2 to the packaging film 3. The first adhesive layer 42 comprises a first hot melt adhesive layer 421, a second hot melt adhesive layer 422, and a first elastic layer 423. The first and second hot melt adhesive layers 421 and 422 provide adhesion to the first adhesive layer 42, while the first elastic layer 423, which is part of the first and second hot melt adhesive layers 421 and 422, can undergo elastic deformation. The first elastic layer 423 can absorb impact force through elastic deformation and also absorb the internal stress generated by the expansion of the battery cell 2. It can also prevent the battery cell 2 from shrinking and forming a cavity between the battery cell 2 and the packaging film 3. When the battery compartment 1 is impacted, a tensile force is generated between the battery cell 2 and the packaging film 3 under the action of inertia. At this time, the first elastic layer 423 will be stretched and deformed, thereby greatly eliminating the risk of battery damage. Especially when the battery or battery compartment 1 is subjected to vibration, the first elastic layer 423 can reduce or even isolate the vibration.When cell 2 expands, it compresses the first elastic layer 423, deforming it and preventing the formation of large internal stresses on the packaging film 3, thus protecting both the packaging film 3 and cell 2 from damage. When cell 2 contracts, the first elastic layer 423 also expands and deforms, filling the gap between cell 2 and packaging film 3, thus preventing cavities within the cavity, avoiding insufficient electrolyte in cell 2, and preventing lithium plating.

[0028] The main reasons for battery expansion and contraction during charging and discharging are as follows: Volume change of electrode materials: During charging, lithium ions are extracted from the positive electrode material and inserted into the negative electrode material, causing the negative electrode material to expand in volume. During discharging, lithium ions are extracted from the negative electrode and return to the positive electrode, causing the negative electrode material to shrink accordingly. This volume change is mainly determined by the characteristics of the negative electrode material, as the volume change of the negative electrode is relatively large during the lithium ion insertion and extraction process. Influence of the SEI film: During the first charge of a lithium battery, the surface of the negative electrode material undergoes a chemical reaction with the electrolyte, forming a solid electrolyte interphase (SEI) film. This process consumes some lithium ions and solvent in the electrolyte, and generates gas, increasing the internal gas pressure of the battery and causing it to expand. In subsequent charge-discharge cycles, the SEI film continuously grows and repairs, which further affects battery expansion. Charge-discharge state and temperature: When the battery is in a high-temperature environment or undergoes rapid charging and discharging, the reaction rate of the electrode materials accelerates, the volume change becomes more drastic, and the expansion force increases accordingly. During battery discharge, as lithium ions are released from the negative electrode and return to the positive electrode, the volume of the negative electrode material shrinks accordingly. This corresponds to the expansion of the negative electrode material during charging. In summary, the expansion and contraction of a battery during charging and discharging are mainly the result of the combined effects of factors such as the volume change of the electrode material, the influence of the SEI film, the state of charge / discharge and temperature, as well as manufacturing defects and design problems. To control battery expansion and improve battery performance and safety, measures such as optimizing the battery material system, modifying the layered structure of the negative electrode material, optimizing the charge / discharge regime, and controlling the battery temperature can be adopted.

[0029] A lack of electrolyte hinders the migration of lithium ions between the positive and negative electrodes. When lithium ions cannot reach the surface of the negative electrode material or embed themselves within it, they precipitate on the surface. This precipitated lithium exists as metallic lithium and may form lithium dendrites, significantly impacting battery performance, such as reducing overall battery performance, drastically shortening cycle life, and hindering fast charging. More seriously, lithium plating can lead to safety risks such as combustion, battery swelling, and even explosion. Therefore, a lack of electrolyte is a major cause of lithium plating, and the problem must be taken seriously, with appropriate measures implemented to prevent its occurrence.

[0030] Reference Figure 3 According to some embodiments of this utility model, the second adhesive layer 43 includes a third hot melt adhesive layer 431, a fourth hot melt adhesive layer 432, and a second elastic layer 433. The third hot melt adhesive layer 431 and the fourth hot melt adhesive layer 432 are respectively disposed on both sides of the second elastic layer 433, and the third hot melt adhesive layer 431 is fixedly disposed on the substrate 41. The second elastic layer 433 is disposed on the second adhesive layer 43, thereby giving the buffer adhesive 4 a stronger ability to elastically deform. Furthermore, when only the first elastic layer 423 is disposed, the first adhesive layer 42 and the second adhesive layer 43 are different, requiring differentiation between the front and back sides of the buffer adhesive 4 during manufacturing or use. However, when the second elastic layer 433 is disposed on the second adhesive layer 43, the first adhesive layer 42 and the second adhesive layer 43 have the same structure, eliminating the need to differentiate between the front and back sides during manufacturing or use of the buffer adhesive 4. This makes the manufacturing and use of the buffer adhesive 4 more convenient.

[0031] According to some embodiments of this utility model, the cavity is provided with multiple side surfaces 33, each of which is adjacent to the side of the mounting side 31 facing the battery cell 2. At least one side surface 33 is provided with a buffer adhesive 4, which is used to fix the battery cell 2 to the side surface 33. By providing buffer adhesive 4 on multiple side surfaces 33 in the cavity, the battery cell 2 can be better prevented from shaking in the cavity, thereby better protecting the battery from damage.

[0032] According to some embodiments of this utility model, a back-side surface 32 is provided inside the cavity, which is opposite to the side of the mounting side 31 facing the battery cell 2. A connecting adhesive 5 is provided on the back-side surface 32 to fix the battery cell 2 to the back-side surface 32. The connecting adhesive 5 allows for better adhesion between the packaging film 3 and the battery cell 2, preventing movement of the packaging film 3 relative to the battery cell 2 and avoiding gaps between them. When the packaging film 3 moves relative to the battery cell 2, friction occurs between them, causing wear on both. It should be noted that in some soft-pack batteries, the packaging film 3 is a easily deformable thin film; therefore, without the connecting adhesive 5 to fix the packaging film 3, gaps can easily form between the packaging film 3 and the battery cell 2.

[0033] According to some embodiments of this utility model, the first elastic layer 423 is polyurethane foam. Polyurethane foam includes PORON foam, PU foam, Korel foam, CR foam, EVA foam, etc. Among them, polyurethane foam not only has good elasticity, but can also withstand a certain high temperature, and absorb a certain amount of electrolyte, thereby making the electrolyte in the battery cell 2 more sufficient.

[0034] According to some embodiments of this utility model, the packaging film 3 is an aluminum-plastic film. The aluminum-plastic film is a key packaging material for pouch batteries, consisting of a multilayer film composed of an outer nylon layer (ON), an adhesive, a middle aluminum foil layer (Al), an adhesive, and an inner heat-sealing layer (CPP). It possesses advantages such as thinness, high formability, high safety, and high barrier properties, making it the preferred packaging material for pouch lithium-ion batteries. In pouch batteries, the aluminum-plastic film primarily protects the internal electrodes and isolates them from the external environment. It effectively prevents the exchange of substances between the battery's internal and external environments, maintaining the battery's stability and safety. Simultaneously, the aluminum-plastic film also has good puncture resistance, effectively preventing short circuits or leakage caused by external force damage, ensuring the battery's integrity and lifespan. Furthermore, the high ductility of the aluminum-plastic film allows it to be obtained in the required shapes and sizes through stamping processes, meeting the design requirements of pouch batteries.

[0035] According to some embodiments of this utility model, the first elastic layer 423 includes a compressed state and an expanded state. When the first elastic layer 423 is in the compressed state, its thickness is no greater than 10 μm; when the first elastic layer 423 is in the expanded state, its thickness is no less than 100 μm. This ensures that the first elastic layer 423 has sufficient elastic deformation, thereby ensuring that it can absorb more impact force.

[0036] According to some embodiments of this utility model, the thickness of the first hot melt adhesive layer 421 is not greater than 5 μm and not less than 1 μm, and the thickness of the second hot melt adhesive layer 422 is not greater than 10 μm and not less than 5 μm. The first hot melt adhesive layer connects to the substrate 41, and the second hot melt adhesive layer 422 connects to the packaging film 3. Since the hot melt adhesive and the substrate 41 can contact each other to obtain greater adhesion, the thickness of the first hot melt adhesive layer 421 can be set to be relatively small, thus using less hot melt adhesive to obtain sufficient adhesion.

[0037] According to some embodiments of this utility model, the battery also includes a fixing adhesive 6, which is disposed on the side of the mounting side 31 facing the battery compartment 1, so as to fix the packaging film 3 to the mounting surface of the battery compartment 1. Disposing of the fixing adhesive 6 on the side of the mounting side 31 facing the mounting surface allows for quicker and more convenient fixing of the battery to the battery compartment 1.

[0038] The electronic device according to the second aspect of the present invention is characterized in that, [1] the area where the mounting side 31 and the fixing adhesive 6 are bonded is a fixed area, the projected area of ​​the buffer adhesive 4 on the mounting side 31 is A, and the projected area of ​​the fixed area on the mounting side 31 is B, A≤B. The area where the mounting side 31 and the fixing adhesive 6 are bonded is a fixed area, and the buffer adhesive 4 disposed on the side of the mounting side 31 facing the battery cell 2 is disposed in the fixed area. This makes the area between the fixing adhesive 6 and the mounting side 31 larger than the area between the buffer adhesive 4 and the mounting side 31. This makes the shock absorption capacity of the buffer adhesive 4 fully utilized.

[0039] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A battery, characterized in that, include: Battery cell; A packaging film that restricts the exit of a cavity, wherein the battery cell is disposed within the cavity, and the packaging film includes an installation side; A buffer adhesive is disposed on the side of the mounting device facing the battery cell to fix the battery cell in the cavity. The buffer adhesive includes a substrate, a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed on one side of the substrate, and the second adhesive layer is disposed on the other side of the substrate. The first adhesive layer includes a first hot melt adhesive layer, a second hot melt adhesive layer and a first elastic layer. The first hot melt adhesive layer and the second hot melt adhesive layer are respectively disposed on both sides of the first elastic layer. The first hot melt adhesive layer is fixedly disposed on the substrate.

2. The battery according to claim 1, characterized in that, The second adhesive layer includes a third hot melt adhesive layer, a fourth hot melt adhesive layer, and a second elastic layer. The second elastic layer has a third hot melt adhesive layer and a fourth hot melt adhesive layer on its two sides, and the third hot melt adhesive layer is fixedly disposed on the substrate.

3. The battery according to claim 1, characterized in that, The cavity has multiple sides, and at least one side adjacent to the side of the device facing the battery cell is provided with a buffer adhesive. The buffer adhesive on the side is used to fix the battery cell on the side.

4. The battery according to claim 1, characterized in that, The cavity is provided with a back-side surface, which is opposite to the side of the device side facing the battery cell. The back-side surface is provided with adhesive to fix the battery cell to the back-side surface.

5. The battery according to claim 1, characterized in that, The first elastic layer is polyurethane foam.

6. The battery according to claim 1, characterized in that, The packaging film is an aluminum-plastic film.

7. The battery according to claim 1, characterized in that, The first elastic layer includes a compressed state and an expanded state. When the first elastic layer is in the compressed state, the thickness of the first elastic layer is not greater than 10 μm; when the first elastic layer is in the expanded state, the thickness of the first elastic layer is not less than 100 μm.

8. The battery according to claim 1, characterized in that, The thickness of the first hot melt adhesive layer is not greater than 5 μm and not less than 1 μm, and the thickness of the second hot melt adhesive layer is not greater than 10 μm and not less than 5 μm.

9. An electronic device, comprising a battery compartment, wherein the side of the battery compartment adjacent to the mounting side is a mounting surface, characterized in that, The device includes a fixative and a battery as described in any one of claims 1-8, wherein the fixative is disposed on the side of the device facing the mounting surface to fix the packaging film on the mounting surface.

10. The electronic device according to claim 9, characterized in that, The area where the mounting side and the fixing adhesive adhere is the fixing area. The projected area of ​​the buffer adhesive on the mounting side is A, and the projected area of ​​the fixing area on the mounting side is B, where A ≤ B.

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