Battery, battery production equipment, battery module and electric equipment

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a battery, battery production equipment, a battery module and electric equipment. The battery provided by the utility model comprises a pole core assembly body, a shell and a glue layer, the thickness of the glue layer is 1-10 [mu] m, and the pole core assembly body and the shell are bonded together. And the glue layer is used for replacing a thicker hot melt adhesive tape, so that the thickness of the bonding layer is reduced, the volume occupancy of the pole core assembly body is increased, and the energy density of the battery is improved. The utility model also provides battery production equipment for producing the battery. The utility model also provides a battery module and electric equipment.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a battery, battery production equipment, battery module and electrical equipment. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics and other products requiring power and energy storage due to their advantages such as high energy density, high operating voltage, long cycle life, and no memory effect. The safety of lithium-ion batteries is a major concern in the industry, especially their drop resistance, which is a core indicator for evaluating their safety performance.

[0003] In current technology, conventional lithium batteries mainly use hot melt adhesive for bonding. However, the thickness of hot melt adhesive tapes on the market is relatively thick, such as 80 micrometers, 45 micrometers, and 25 micrometers. While the use of hot melt adhesive tape can improve the battery's drop resistance, it limits the energy density of the lithium battery.

[0004] Developing a structure that can maintain the battery's drop resistance without sacrificing the lithium battery's energy density has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a battery, battery manufacturing equipment, battery module, and electrical device. Compared to batteries that attach hot melt adhesive to the core assembly body, the battery provided by this invention maintains drop resistance without sacrificing energy density. To address the problems and shortcomings of existing technologies, this invention provides a battery comprising:

[0006] Core component body;

[0007] A housing for enclosing the core assembly body;

[0008] An adhesive layer, which is a hot melt adhesive, is applied to at least one side of the electrode core assembly body to bond the electrode core assembly body to the housing; the thickness of the adhesive layer is 1~10μm.

[0009] Optionally, the battery is a square battery, and the adhesive layer is coated on at least one side of the core assembly body in its thickness direction.

[0010] Optionally, the coating area of ​​the adhesive layer is more than 30% of the side surface area of ​​the electrode core assembly body.

[0011] Optionally, the housing is an aluminum-plastic shell.

[0012] Optionally, the electrode core assembly body is a wound electrode core assembly.

[0013] This utility model also provides a battery manufacturing apparatus for producing the battery described in any of the above claims. The battery manufacturing apparatus includes a coating device for coating the hot melt adhesive.

[0014] Optionally, the coating apparatus includes:

[0015] The nozzle is used to uniformly spray the hot melt adhesive onto the outer surface of the electrode core assembly body.

[0016] A storage device, wherein the nozzles of the storage device are connected by a high-pressure hose for storing the hot melt adhesive;

[0017] A high-pressure hose is used to pump the hot melt adhesive from the storage device to the nozzle.

[0018] Optionally, the battery production equipment includes a winding machine, and the coating equipment is mounted on the winding machine.

[0019] This utility model also provides a battery module, which includes the battery described in any of the above claims, and the number of the batteries is multiple, with the multiple batteries connected in series and / or in parallel.

[0020] Optionally, the present invention also provides a battery module, the battery module comprising batteries produced by the battery production equipment described in any of the above claims; the number of batteries is multiple, and the multiple batteries are connected in series and / or in parallel.

[0021] This utility model also provides an electrical device, which includes the battery described in any of the above claims.

[0022] Optionally, the present invention also provides an electrical device, the electrical device including the battery module described in any of the above claims.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] (1) A 1-10 μm thick adhesive layer is used to replace the thicker hot melt adhesive tape to bond the core assembly body and the shell, which reduces the thickness of the adhesive layer, increases the volume occupancy of the core assembly body, and improves the battery energy density.

[0025] (2) Increase the proportion of the adhesive layer coating area on the surface of the core component body, increase the bonding area between the core component body and the shell, and improve the battery's drop resistance.

[0026] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0027] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0028] Figure 1 This is a cross-sectional view of a battery according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the core assembly body and the adhesive layer according to one embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of a coating apparatus according to an embodiment of the present invention.

[0031] In the diagram: 11-Core assembly body; 12-Adhesive layer; 13-Housing; 21-Storage device; 22-Nozzle; 23-High-pressure hose; 24-High-pressure pump; 25-Filter; 26-Control panel. Detailed Implementation

[0032] The following reference Figures 1 to 3 This invention describes a battery, battery manufacturing equipment, battery module, and electrical device according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0033] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Figure 1 This is a cross-sectional view of a battery according to an embodiment of the present invention. Figure 1 As shown, and in combination Figures 2 to 3 This invention provides a battery comprising a core assembly body 11, a housing 13, and an adhesive layer 12. The housing 13 is used to enclose the core assembly body 11. The adhesive layer 12 is a hot melt adhesive, applied to at least one side of the core assembly body 11 to bond the core assembly body 11 and the housing 13. The thickness of the adhesive layer 12 is 1~10μm.

[0035] Specifically, firstly, a hot melt adhesive with a thickness of 1~10μm is coated on a portion of the outer surface of the prepared core component body 11 to form an adhesive layer 12. Secondly, the prepared shell 13 and the core component body 11 coated with hot melt adhesive are bonded together. Finally, during the hot pressing formation stage, the adhesive layer 12 bonds the shell 13 and the core component body 11 together.

[0036] It should be noted that the thickness of the adhesive layer 12 is any value between 1 and 10 μm, such as 1 μm, 1.2 μm, 1.8 μm, 2.0 μm, 3.5 μm, 4.2 μm, etc.

[0037] In this embodiment, when bonding the core assembly body 11 and the housing 13, a thinner adhesive layer 12 is used instead of a thicker hot melt adhesive tape to increase the volume ratio of the core assembly body 11 in the battery, thereby increasing the energy density of the battery.

[0038] In some embodiments of this utility model, the battery is a square battery, and the adhesive layer 12 is coated on at least one side of the electrode core assembly body 11 in its thickness direction.

[0039] In this embodiment, the battery is a square battery. The regular shape of the square battery makes it easy to combine and stack, allowing more batteries to be accommodated in the same space, thus resulting in a battery pack with a higher overall energy density.

[0040] In some embodiments of this utility model, the coating area of ​​the adhesive layer 12 is not less than 50% of the surface area of ​​the core assembly body 11.

[0041] In this embodiment, the coating area of ​​the hot melt adhesive on the surface of the core assembly body 11 is not less than 50% of the surface area of ​​the core assembly body 11, so that the bonding area between the core assembly body 11 and the shell 13 is not less than 50% of the surface area of ​​the core assembly body 11. Compared with bonding the core assembly body 11 and the shell 13 with hot melt adhesive tape, the bonding method in this embodiment increases the bonding area, which is beneficial to improving the battery's drop resistance.

[0042] In some embodiments of this utility model, the battery casing 13 is an aluminum-plastic shell. In this embodiment, using an aluminum-plastic shell as the battery casing 13 gives the battery casing 13 greater plasticity.

[0043] In some embodiments of this utility model, the electrode core assembly body 11 is a wound electrode core assembly. In this embodiment, the wound electrode core assembly has the advantages of high production efficiency and low cost.

[0044] This invention also provides a battery manufacturing apparatus for producing the batteries described in any of the above embodiments. The battery manufacturing apparatus includes a coating device for applying hot melt adhesive.

[0045] In this embodiment, a coating device is used to coat the wound electrode core assembly with hot melt adhesive, thereby automating the production process.

[0046] In some embodiments of this invention, the coating apparatus includes a nozzle 22, a storage device 21, and a high-pressure hose 23. The nozzle 22 uniformly sprays hot melt adhesive onto the outer surface of the electrode core assembly body 11. The storage device 21 stores the hot melt adhesive, and the storage device 21 and the nozzle 22 are connected via the high-pressure hose 23. The high-pressure hose 23 pumps the hot melt adhesive from the storage device 21 to the nozzle 22.

[0047] Specifically, the storage device 21 and the nozzle 22 are connected by a high-pressure hose 23. The high-pressure hose 23 delivers the hot melt adhesive in the storage device 21 to the nozzle 22, and then sprays it onto the outer surface of the core assembly body 11.

[0048] In this embodiment, spraying with nozzle 22 can improve the uniformity of hot melt adhesive on the outer surface of the core assembly body 11.

[0049] In some embodiments of the present invention, the coating apparatus further includes a high-pressure pump 24, which is located at the connection between the storage device 21 and the high-pressure hose 23, for providing pressure for the hot melt adhesive to be transmitted within the high-pressure hose 23.

[0050] In some other embodiments of this invention, the coating apparatus further includes a filter 25 disposed in the flow path of the high-pressure hose 23. In this embodiment, the filter 25 is disposed in the flow path of the high-pressure hose 23 to filter impurities in the hot melt adhesive.

[0051] In some other embodiments of this invention, the coating apparatus further includes a control panel 26. In this embodiment, the process parameters of the coating apparatus are adjusted via the control panel 26.

[0052] In some embodiments of this utility model, the battery production equipment includes a winding machine, and the coating equipment is mounted on the winding machine.

[0053] In this embodiment, the coating device is mounted on the winding machine, allowing hot melt adhesive to be applied after the core is completed, followed by encapsulation, formation, and other processes. This reduces the equipment footprint and improves production efficiency.

[0054] This utility model also provides a battery module, which includes multiple batteries as described above, and the multiple batteries are connected in series.

[0055] The battery module of this application contains multiple batteries, effectively increasing the capacity and application range of the battery module. Those skilled in the art can select an appropriate number based on the application and capacity of the battery module.

[0056] This utility model also provides a battery module, which includes multiple batteries as described in any of the above embodiments, and the multiple batteries are connected in parallel.

[0057] In this embodiment, multiple batteries are connected in parallel, which enables the battery module to achieve a higher battery capacity. Furthermore, when one battery is depleted or malfunctions, it does not affect the continued power supply of other batteries that are low on power, thereby ensuring the continuous operation of the electrical equipment.

[0058] This utility model also provides a battery module, which includes multiple batteries produced by the battery production equipment in any of the above embodiments, and the multiple batteries are connected in series.

[0059] The battery module of this application contains multiple batteries, effectively increasing the capacity and application range of the battery module. Those skilled in the art can select an appropriate number based on the application and capacity of the battery module.

[0060] In some other embodiments of this utility model, the battery module includes multiple batteries produced by the battery production equipment in any of the above embodiments, and the multiple batteries are connected in parallel.

[0061] In this embodiment, multiple batteries are connected in parallel, which enables the battery module to achieve a higher battery capacity. Furthermore, when one battery is depleted or malfunctions, it does not affect the continued power supply of other batteries in the battery module, thereby ensuring the continuous operation of the electrical equipment.

[0062] This utility model also provides an electrical device, which includes the battery in any of the above embodiments.

[0063] The electrical device used in this application embodiment is not particularly limited, and can be any electrical device known in the prior art. In some embodiments, the electrical device may include, but is not limited to, electronic cigarettes, electronic vaporizers, wireless headphones, robot vacuum cleaners, drones, laptops, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, over-ear stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, household large-capacity batteries, and lithium-ion capacitors, etc.

[0064] In some other embodiments of this invention, the electrical device includes the battery module described in any of the above embodiments.

[0065] In this embodiment, the battery module is designed according to the actual situation to enable the battery module to have more efficient energy transfer.

[0066] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0067] Example 1

[0068] A square battery has a core assembly body that is a wound core assembly. Hot melt adhesive is applied to the end face and the opposite face of the core assembly body, with an adhesive layer thickness of 5μm, covering 50% of the total area of ​​each face. The casing is an aluminum-plastic composite shell, and the core assembly body and the aluminum-plastic composite shell are bonded together by the adhesive layer. The battery cell is then manufactured through processes such as core winding, encapsulation, and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2Mpa. After the hot-pressing formation process, the hot melt adhesive sprayed on the core assembly functions to firmly bond the core assembly and the aluminum-plastic composite film together.

[0069] Example 2

[0070] A square battery has a core assembly body that is a wound core assembly. Hot melt adhesive is applied to the end face of the core assembly body, with a thickness of 5μm, covering 50% of its total area. The casing is an aluminum-plastic composite shell, and the core assembly body and the aluminum-plastic composite shell are bonded together by the adhesive layer. The battery cell is then manufactured through processes such as core winding, encapsulation, and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2Mpa. After the hot-pressing formation process, the hot melt adhesive sprayed on the core assembly functions to firmly bond the core assembly and the aluminum-plastic composite film together.

[0071] Example 3

[0072] A square battery has a core assembly body that is a wound core assembly. Hot melt adhesive is applied to the side of the core assembly body opposite the finished surface; the adhesive layer is 5 μm thick, and the area covered by the adhesive layer accounts for 50% of its total area. The casing is an aluminum-plastic composite shell, and the core assembly body and the aluminum-plastic composite shell are bonded together by the adhesive layer. The battery cell is then manufactured through processes such as core winding, encapsulation, and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2 MPa. After the hot-pressing formation process, the hot melt adhesive sprayed on the core assembly functions to firmly bond the core assembly and the aluminum-plastic composite film together.

[0073] Comparative Example

[0074] A square battery has a core assembly body that is a wound core assembly. Hot melt adhesive tape, 45 μm thick, is adhered to the end face and the opposite side of the core assembly body. The battery cell is then manufactured through processes such as encapsulation and formation. The formation temperature is 80℃±5℃, and the formation pressure is 0.8~1.2 MPa. After the hot-press formation process, the hot melt adhesive tape adhered to the core assembly functions to firmly bond the core assembly and the aluminum-plastic film together.

[0075] Drop tests, micro-drop tests, and roller tests were performed on the above Examples 1 to 3 and the comparative examples.

[0076] Drop test:

[0077] Take 10 batteries for each group, fully charge the batteries at 0.5C, and drop them freely from a height of 1 meter onto a smooth concrete surface. Drop them once in each of the 6 directions (X, Y, Z, positive and negative) for a total of 6 drops. Increase the number of consecutive drops to 12 (repeated twice in each direction).

[0078] The standard for qualification is that the battery is qualified if it does not exhibit safety issues such as bulging, leakage, overheating, smoking, or catching fire.

[0079] Slight drop test:

[0080] Take 10 batteries for each group, fully charge the batteries at 0.5C, and drop them freely from a height of 15 cm onto a smooth concrete surface. Drop them 1000 times in each of the 6 directions (X, Y, Z, positive and negative) for a total of 6000 drops.

[0081] The standard for qualification is that the battery is qualified if it does not exhibit safety issues such as bulging, leakage, overheating, smoking, or catching fire.

[0082] Roller test:

[0083] Take 10 batteries for each group, fully charge the batteries at 0.5C, use a 1.5-meter diameter roller with 50-millimeter diameter steel balls inside to put the batteries into the roller, and let the roller roll continuously at a speed of 10 revolutions per minute for 60 minutes.

[0084] The standard for qualification is that the battery is qualified if it does not exhibit safety issues such as bulging, leakage, overheating, smoking, or catching fire.

[0085] The test results are shown in Table 1.

[0086] Table 1 Battery performance test results

[0087]

[0088] As can be seen from the test results in Table 1, the drop test, micro-drop test and roller test results of Examples 1 to 3 are all better than those of the comparative examples.

[0089] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A battery, characterized in that, The battery includes: Core component body; A housing for enclosing the core assembly body; An adhesive layer, which is a hot melt adhesive, is applied to at least one side of the electrode core assembly body to bond the electrode core assembly body to the housing; the thickness of the adhesive layer is 1~10μm.

2. The battery according to claim 1, characterized in that, The battery is a square battery, and the adhesive layer is coated on at least one side of the electrode core assembly body in its thickness direction.

3. The battery according to claim 2, characterized in that, The area covered by the adhesive layer is more than 30% of the side surface area of ​​the core assembly body.

4. The battery according to claim 1, characterized in that, The shell is an aluminum-plastic shell.

5. The battery according to claim 1, characterized in that, The core assembly body is a wound core assembly.

6. A battery manufacturing apparatus for producing the battery according to any one of claims 1-5, characterized in that, It includes coating equipment for coating the hot melt adhesive.

7. The battery production equipment according to claim 6, characterized in that, The coating equipment includes: The nozzle is used to uniformly spray the hot melt adhesive onto the outer surface of the electrode core assembly body. A storage device, wherein the nozzles of the storage device are connected by a high-pressure hose for storing the hot melt adhesive; A high-pressure hose is used to pump the hot melt adhesive from the storage device to the nozzle.

8. The battery production equipment according to claim 6, characterized in that, The battery production equipment includes a winding machine, and the coating equipment is mounted on the winding machine.

9. A battery module, characterized in that, Includes the battery as described in any one of claims 1-5, or includes the battery produced by the battery production equipment as described in any one of claims 6-8; the number of the batteries is multiple, and the multiple batteries are connected in series and / or in parallel.

10. An electrical appliance, characterized in that, The electrical equipment includes a battery as described in any one of claims 1-5, or includes a battery module as described in claim 9.

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