Battery, battery production equipment and battery module

Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a battery, battery production equipment and a battery module. The battery provided by the utility model comprises a pole core assembly body and a shell, wherein the shell is provided with a punching pit for accommodating the pole core assembly body. The hot melt glue layer is coated in the punching pit and is used for bonding the pole core assembly body and the shell, and the area of the hot melt glue layer is 50%-100% of the area of the inner bottom surface of the punching pit, so that the bonding area of the pole core assembly body and the shell is increased, and the anti-falling capability of the battery is improved. The utility model further provides battery production equipment and a battery module.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technical field, especially a kind of battery, battery production equipment and battery module. BACKGROUND

[0002] Lithium ion battery is widely used in consumer electronics products and products requiring power and energy storage due to its high energy density, high operating voltage, long cycle life and no memory effect. The safety of lithium ion battery is a very concerned issue in the industry, especially the drop resistance of the battery as a core indicator of evaluating the safety performance of lithium ion battery, which is more concerned.

[0003] In the prior art, conventional lithium batteries are mainly bonded using hot melt adhesive. However, the thickness of hot melt adhesive tapes on the market is relatively thick, such as 80 microns, 45 microns and 25 microns. Although the use of hot melt adhesive tape can improve the drop resistance of the battery, it limits the development of lithium battery energy density.

[0004] It is a technical problem for those skilled in the art to develop a structure that can improve the drop resistance of the battery without sacrificing the energy density of the lithium battery. SUMMARY

[0005] The utility model discloses a kind of battery, battery production equipment and battery module, to solve the problem of poor drop resistance of battery in prior art. Specifically, the utility model provides a kind of battery, and the above-mentioned battery includes pole core component body and shell. The shell is provided with pit, to accommodate the pole core component body;Hot melt glue water layer is coated in the pit;The hot melt glue water layer bonds the pole core component body and the shell, and the area of the hot melt glue water layer is 50%~100% of the inner bottom surface area of pit.

[0006] Optionally, the pit is one;Or,

[0007] The pit is two, and the depth of the two pits is the same or different.

[0008] Optionally, the hot melt glue water is one of polyamide hot melt glue water, polyethylene hot melt glue water, polyurethane hot melt glue water and ethylene-vinyl acetate copolymer hot melt glue water.

[0009] Optionally, the shell is aluminum plastic shell.

[0010] Optionally, the pole core component body is a wound pole core component.

[0011] Optionally, the thickness of the hot melt glue water layer is 1~10 μm.

[0012] The utility model also provides a battery production equipment to produce the battery described in any one of the above. The battery production equipment includes coating equipment, the coating equipment is used to coat hot melt glue water.

[0013] Optionally, the coating equipment includes:

[0014] A spray head is arranged on the coating equipment, and the spray head is used to spray the hot melt glue water on the inner surface of the impact pit.

[0015] A storage device is arranged on the coating equipment, and the storage device is used to store the hot melt glue water.

[0016] A high-pressure hose is arranged on the coating equipment, and the high-pressure hose is used to pump the hot melt glue water in the storage device to the spray head.

[0017] Optionally, the battery production equipment further includes an impact shell device used to process the impact pit on the shell body, and the coating equipment is arranged on the impact shell device.

[0018] The utility model also provides a battery module, and the battery module is characterized in that the battery module includes the battery described in any one of the above or the battery produced by the battery production equipment described in any one of the above; the number of the battery is multiple, and the multiple batteries are connected in series and / or connected in parallel.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] The hot melt glue water is coated on the inner bottom surface of the impact pit, the coating area is greater than 50% of the area of the inner bottom surface of the impact pit, the bonding area of the core assembly body and the shell body is increased, and the drop resistance of the battery is improved.

[0021] The above and other objects, advantages and features of the utility model will become more apparent from the following detailed description of the specific embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Some specific embodiments of the utility model will be described in detail hereinafter with reference to the accompanying drawings in an exemplary and non-restrictive manner. The same reference signs in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that the drawings are not necessarily drawn to scale. In the drawings:

[0023] Figure 1 is the sectional view of the battery of one embodiment of the utility model.

[0024] Figure 2 is the structural schematic view of the shell body and the hot melt glue water layer of one embodiment of the utility model.

[0025] Figure 3It is a schematic view of a coating device of an embodiment of the utility model.

[0026] In the figure: 11-pole core assembly body;12-hot melt glue layer;13-housing;131-pit;21-storage device, 22-nozzle, 23-high pressure hose, 24-high pressure pump, 25-filter, 26-control panel. DETAILED DESCRIPTION

[0027] The utility model discloses an embodiment of a battery, a battery production equipment and a battery module are described below. Figures 1 to 3 In the description of the embodiment, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features, that is, one or more of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited. When a certain feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, it indicates that other features and can further include other features are not excluded.

[0028] In the description of the embodiment, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0029] Figure 1 It is a cross-sectional view of a battery according to an embodiment of the utility model. As Figure 1 Indicated, and in conjunction with Figure 2 The utility model provides a kind of battery, and the above-mentioned battery includes pole core assembly body 11 and shell 13. Shell 13 is provided with pit 131, to accommodate pole core assembly body 11;Hot melt glue layer 12 is coated in pit 131. Hot melt glue layer 12 bonds pole core assembly body 11 and shell 13, and the area of hot melt glue layer 12 is 50%~100% of the inner bottom surface area of pit 131.

[0030] Specifically, first, according to the shape and size of the polar core assembly body 11, a pit 131 capable of accommodating the polar core assembly body 11 is formed on the shell 13. Secondly, a hot melt glue layer 12 is coated on the inner bottom surface of the pit 131. Finally, the polar core assembly body 11 is placed in the pit 131, and the polar core assembly body 11 and the shell 13 are bonded together by hot pressing. It should be noted that the part of the inner bottom surface of the pit 131 coated with the hot melt glue layer 12 accounts for more than 50% of the total area.

[0031] In this embodiment, the bonding area of the polar core assembly body 11 and the shell 13 is increased, thereby improving the drop resistance of the power.

[0032] In some embodiments of the utility model, the pit 131 is one.

[0033] In some embodiments of the utility model, the pit 131 is two, and the depths of the two pits 131 are the same. Specifically, the shell 13 has two pits 131 with the same depth, and the inner bottom surfaces of the two pits 131 form a space for accommodating the polar core assembly body 11.

[0034] In this embodiment, the two pits 131 are opposite to each other and form a space for accommodating the polar core assembly body 11, which is convenient for later packaging.

[0035] In some other embodiments of the utility model, the pit 131 is two, and the depths of the two pits 131 are different.

[0036] In some embodiments of the utility model, the four corners of the pit 131 are provided with arc chamfers. In this embodiment, the arc chamfer is provided to avoid point-like extrusion during collision or extrusion, thereby increasing safety.

[0037] In some embodiments of the utility model, the hot melt glue is one of polyamide hot melt glue, polyethylene hot melt glue, polyurethane hot melt glue and ethylene-vinyl acetate copolymer hot melt glue.

[0038] In this embodiment, the hot melt glue is selected from polyamide hot melt glue, polyethylene hot melt glue, polyurethane hot melt glue and ethylene-vinyl acetate copolymer hot melt glue, thereby improving the selectability and diversity of the hot melt glue layer 12, and facilitating the selection of the hot melt glue layer 12.

[0039] In some embodiments of the utility model, the shell 13 of the battery is an aluminum plastic shell. In this embodiment, the aluminum plastic shell is used as the shell 13 of the battery, so that the shell 13 of the battery has strong plasticity.

[0040] In some embodiments of the utility model, the polar core assembly body 11 is a wound polar core assembly. In this embodiment, the wound polar core assembly has the advantages of high production efficiency and low cost.

[0041] In some embodiments of the present application, the thickness of the hot melt glue layer 12 is 1-10 microns. In this embodiment, the thickness of the hot melt glue layer 12 is controlled in the thickness range of 1-10 microns, which is smaller than the thickness of the conventional hot melt adhesive tape, so as to improve the volume ratio of the core assembly body 11 in the battery, thereby improving the energy density of the battery.

[0042] It should be noted that the thickness of the hot melt glue layer 12 is any value in the range of 1-10 microns, such as 1 micron, 1.2 microns, 1.8 microns, 2.0 microns, 3.5 microns, 4.2 microns, etc.

[0043] The present application also provides a battery production equipment for producing the battery of any of the above embodiments. The battery production equipment comprises a coating device for coating the hot melt glue.

[0044] In this embodiment, the coating device is used to coat the hot melt glue on the inner surface of the shell 13, realizing the automation of production.

[0045] As shown in Figure 3 In some embodiments of the present application, the coating device comprises a spray head 22, a storage device 21 and a high-pressure hose 23. The spray head 22 uniformly sprays the hot melt glue on the inner surface of the pit 131. The storage device 21 is used to store the hot melt glue, and the storage device 21 and the spray head 22 are connected by the high-pressure hose 23. The high-pressure hose 23 is used to pump the hot melt glue in the storage device 21 to the spray head 22.

[0046] Specifically, the storage device 21 and the spray head 22 are connected by the high-pressure hose 23, the high-pressure hose 23 delivers the hot melt glue in the storage device 21 to the spray head 22, and sprays it on the outer surface of the core assembly body 11 through the spray head 22.

[0047] In this embodiment, the spray head 22 is used for spraying, which can improve the uniformity of the hot melt glue coating in the pit 131.

[0048] In some embodiments of the present application, the coating device further comprises a high-pressure pump 24, which is arranged at the position where the storage device 21 and the high-pressure hose 23 are connected, and is used to provide the pressure for the transmission of the hot melt glue in the high-pressure hose 23.

[0049] In some other embodiments of the present application, the coating device further comprises a filter 25 arranged on the flow path of the high-pressure hose 23. In this embodiment, the filter 25 is arranged on the flow path of the high-pressure hose 23 to filter the impurities in the hot melt glue.

[0050] In some other embodiments of the present application, the coating device further comprises a control panel 26. In this embodiment, the process parameters of the coating device are adjusted through the control panel 26.

[0051] In some embodiments of the present application, the battery production equipment further comprises a shell punching device for punching the shell 13, and the coating device is arranged on the shell punching device.

[0052] Specifically, the aluminum plastic film is punched by the shell punching device, then hot melt glue is coated on the punched shell 131, and finally the core assembly body 11 is placed in the punched shell 131 to package the battery.

[0053] In this embodiment, the coating device is arranged on the shell punching device, so that the hot melt glue can be coated after the shell 13 is punched, and then the packaging, formation and other processes are performed. The equipment footprint is reduced, and the production efficiency is improved.

[0054] The present application also provides a battery module, which comprises a plurality of batteries according to any one of the above embodiments, and the plurality of batteries are connected in series.

[0055] The battery module of the present application contains a plurality of batteries, effectively expanding the capacity of the battery module and expanding the application range of the battery module. A person skilled in the art can select an appropriate number according to the application and capacity of the battery module.

[0056] The present application also provides a battery module, which comprises a plurality of batteries according to any one of the above embodiments, and the plurality of batteries are connected in parallel.

[0057] In this embodiment, the plurality of batteries are connected in parallel, which can make the battery module have higher battery capacity, and when one battery is exhausted or fails, it does not affect the continuous power supply of other batteries in the battery module, thereby ensuring the continuous operation of the electrical equipment.

[0058] The present application also provides a battery module, which comprises a plurality of batteries produced by the battery production equipment according to any one of the above embodiments, and the plurality of batteries are connected in series.

[0059] The battery module of the present application contains a plurality of batteries, effectively expanding the capacity of the battery module and expanding the application range of the battery module. A person skilled in the art can select an appropriate number according to the application and capacity of the battery module.

[0060] In some other embodiments of the present application, the battery module comprises a plurality of batteries produced by the battery production equipment according to any one of the above embodiments, and the plurality of batteries are connected in parallel.

[0061] In the embodiment, the plurality of batteries are connected in parallel, so that the battery module can have higher battery capacity, and when one battery is exhausted or fails, the other batteries in the battery module can continue to supply power, thereby ensuring continuous operation of the electrical equipment.

[0062] Preferred embodiments of the present application will be described in more detail below. Although the following describes preferred embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to convey the scope of the present application to those skilled in the art.

[0063] Example 1

[0064] A square battery, the pole core assembly body is a winding pole core assembly, the shell has two different depth pits. The inner bottom surface of the two pits is coated with hot melt glue respectively, the thickness of the hot melt glue layer is 5μm, the area covered by the hot melt glue layer accounts for 50% of the total area of the surface respectively. The shell is an aluminum plastic shell, the pole core assembly body and the aluminum plastic shell are bonded together through the hot melt glue layer. Then the manufacturing of the battery cell is completed through the processes of winding core pressing, packaging, formation and the like, the formation temperature is 80℃±5℃, the formation pressure is 0.8~1.2Mpa, after the hot-pressing formation process, the hot melt glue sprayed on the pole core assembly body plays a role, firmly bonding the pole core assembly body and the aluminum plastic film together.

[0065] Example 2

[0066] A square battery, the pole core assembly body is a winding pole core assembly, the shell has two different depth pits. The inner bottom surface of the two pits is coated with hot melt glue respectively, the thickness of the hot melt glue layer is 5μm, the area covered by the hot melt glue layer accounts for 50% of the total area of the surface respectively. The shell is an aluminum plastic shell, the pole core assembly body and the aluminum plastic shell are bonded together through the hot melt glue layer. Then the manufacturing of the battery cell is completed through the processes of winding core pressing, packaging, formation and the like, the formation temperature is 80℃±5℃, the formation pressure is 0.8~1.2Mpa, after the hot-pressing formation process, the hot melt glue sprayed on the pole core assembly body plays a role, firmly bonding the pole core assembly body and the aluminum plastic film together.

[0067] Example 3

[0068] A square battery, the electrode core assembly body is a wound electrode core assembly, the shell has two punch pits with different depths. The inner bottom surface of the shallower punch pit is coated with a hot melt adhesive layer, the thickness of the hot melt adhesive layer is 5 μm, and the area covered by the hot melt adhesive layer accounts for 50% of the total area. The shell is an aluminum plastic shell, and the electrode core assembly body and the aluminum plastic shell are bonded together by the hot melt adhesive layer. Then the manufacturing of the battery cell is completed through processes such as winding core pressing, packaging, formation, etc. 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 electrode core assembly body plays a role, firmly bonding the electrode core assembly body and the aluminum plastic film together.

[0069] Comparative example

[0070] A square battery, the electrode core assembly body is a wound electrode core assembly. A hot melt adhesive tape is pasted on the end surface of the electrode core assembly body and the surface opposite to the end surface, and the thickness of the hot melt adhesive tape is 45 μm. Then the manufacturing of the battery cell is completed through processes such as packaging, formation, etc. 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 tape pasted on the electrode core assembly plays a role, firmly bonding the electrode core assembly and the aluminum plastic film together.

[0071] The above examples 1~3 and comparative example are subjected to drop test, micro-drop test and roller test.

[0072] Drop test:

[0073] Take 10 batteries from each group, and the batteries are fully charged at 0.5C. From a height of 1 meter, freely drop onto a smooth concrete surface, from X, Y, Z positive and negative directions (6 directions), each direction drops once, a total of 6 times. The test is repeated for 12 times (each direction is repeated twice).

[0074] Passing standard: the battery does not appear swelling, leakage, heating, smoking, fire and other safety problems.

[0075] Micro-drop test:

[0076] Take 10 batteries from each group, and the batteries are fully charged at 0.5C. From a height of 15 centimeters, freely drop onto a smooth concrete surface, from X, Y, Z positive and negative directions (6 directions), each direction drops 1000 times, a total of 6000 times.

[0077] Passing standard: the battery does not appear swelling, leakage, heating, smoking, fire and other safety problems.

[0078] Roller test:

[0079] Take 10 batteries in each group, and charge the batteries at 0.5C, use a roller with a diameter of 1.5 meters, which is internally provided with steel balls with a diameter of 50 millimeters, put the batteries into the roller, and continuously roll the roller at a speed of 10 revolutions per minute for 60 minutes.

[0080] Qualified standard: the batteries are qualified if no safety problems such as swelling, liquid leakage, overheating, smoking, fire, etc. occur.

[0081] The test results obtained are shown in Table 1.

[0082] Table 1: Battery performance test results

[0083]

[0084] As can be seen from the test results in Table 1, the results of the drop test, micro-drop test and roller test of Examples 1-3 are all better than those of the comparative examples.

[0085] At this point, those skilled in the art should recognize that, although the present application has been shown and described in detail in this paper, many other variants or modifications conforming to the principles of the present application can be directly determined or deduced according to the content disclosed in the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variants or modifications.

Claims

1. A battery, characterized by, The battery comprises: a pole core assembly body; a shell, the shell being provided with a punched pit for accommodating the pole core assembly body; the punched pit being coated with a hot melt glue water layer; the hot melt glue water layer bonding the pole core assembly body and the shell, and the area of the hot melt glue water layer being 50%-100% of the area of the inner bottom surface of the pit.

2. The battery of claim 1, wherein, The punched pit is one; or, The punched pit is two, and the depths of the two punched pits are the same or different.

3. The battery of claim 1, wherein, The hot melt glue water is one of polyamide hot melt glue water, polyethylene hot melt glue water, polyurethane hot melt glue water, and ethylene-vinyl acetate copolymer hot melt glue water.

4. The battery of claim 1, wherein, The shell is an aluminum plastic shell.

5. The battery of claim 1, wherein, The pole core assembly body is a wound pole core assembly.

6. The battery of claim 1, wherein, The thickness of the hot melt glue water layer is 1-10 μm.

7. A battery production apparatus for producing the battery as claimed in any one of claims 1 to 6, characterized by, The battery production equipment comprises a coating device for coating the hot melt glue water.

8. The battery production apparatus according to claim 7, wherein The coating device comprises: a spray head for uniformly spraying the hot melt glue water on the inner surface of the pit; a storage device in communication with the spray head, the storage device being used to store the hot melt glue water; a high-pressure hose for pumping the hot melt glue water in the storage device to the spray head.

9. The battery production apparatus according to claim 7, wherein The battery production equipment further comprises a shell punching device for processing the pit on the shell, and the coating device is arranged on the shell punching device.

10. A battery module, characterized by The battery comprises the battery as claimed in any one of claims 1-7, or the battery produced by the battery production equipment as claimed in claim 8 or 9; the number of the batteries is multiple, and the multiple batteries are connected in series and / or in parallel.

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