Battery cell, battery and electric equipment

Abstract

The utility model provides a battery cell, a battery and electric equipment. The battery cell comprises a shell, a battery cell main body, a sleeve, an outer gasket and a reinforcing part, a mounting cavity is formed in the shell, the battery cell main body is mounted in the mounting cavity, the sleeve sleeves the shell and comprises a top covering part, the top covering part is arranged opposite to the inner bottom wall of the shell, the outer gasket is arranged between the shell and the top covering part, and the reinforcing part is connected to the outer gasket. According to the battery cell disclosed by the invention, the tilting amplitude of the outer gasket under the action of the extrusion force after the sleeve is thermally shrunk can be effectively reduced, the condition that the end part of the battery cell is abnormally tilted can be prevented, and the quality of the battery cell is ensured.

Description

TECHNICAL FIELD

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

[0002] The battery cell is a core component of a battery, and is widely used in energy storage systems, vehicles and consumer electronics.

[0003] In the related art, the battery cell is prone to abnormal end lifting during production. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a battery cell, a battery and an electric device, which can improve the technical problem that the battery cell is prone to abnormal end lifting.

[0005] In a first aspect, embodiments of the present application provide a battery cell, comprising:

[0006] a housing formed with a mounting cavity;

[0007] a battery cell body installed in the mounting cavity;

[0008] a sleeve disposed on the housing, the sleeve comprising a top cover portion, the top cover portion being oppositely disposed with an inner bottom wall of the housing;

[0009] an outer gasket disposed between the housing and the top cover portion;

[0010] a reinforcing portion connected to the outer gasket.

[0011] In an embodiment, the battery cell body comprises an electrode assembly and a cap, the electrode assembly is installed in the mounting cavity, and the electrode assembly is located between the cap and the inner bottom wall of the housing.

[0012] One end of the reinforcing portion is connected to the outer gasket, and the other end of the reinforcing portion is bent and extends into the mounting cavity and abuts against the cap.

[0013] In an embodiment, the reinforcing portion comprises a first connecting portion and a second connecting portion, the first connecting portion connects the outer gasket and the second connecting portion, one end of the second connecting portion away from the first connecting portion abuts against the cap, a first included angle is formed between the first connecting portion and the outer gasket, and a second included angle is formed between the second connecting portion and the first connecting portion.

[0014] In an embodiment, a distance between the outer gasket and the inner bottom wall of the housing is L1, and a distance between the second connecting portion and the inner bottom wall of the housing is L2, wherein L1>L2, and a difference between L1 and L2 is between 0.2mm and 0.6mm.

[0015] In an embodiment, the inner diameter of the second connecting portion is between 8mm and 14mm, and / or the outer diameter of the first connecting portion is between 11mm and 15mm.

[0016] In an embodiment, the height of the reinforcing portion is between 0.3mm and 0.5mm along the axial direction of the shell.

[0017] In an embodiment, the thickness of the outer gasket is between 0.15mm and 0.25mm; and / or,

[0018] the outer diameter of the outer gasket is between 14mm and 20mm; and / or,

[0019] the difference between the outer diameter of the outer gasket and the inner diameter of the outer gasket is between 2.5mm and 4.5mm.

[0020] In an embodiment, the reinforcing portion is integrally formed with the outer gasket.

[0021] In a second aspect, embodiments of the present application provide a battery comprising the above-mentioned battery cell.

[0022] In a third aspect, embodiments of the present application provide a use-electricity device comprising the above-mentioned battery.

[0023] The beneficial effects of embodiments of the present application are as follows:

[0024] In embodiments of the present application, by arranging the outer gasket between the top covering portion of the shell and the sleeve, both the outer gasket and the sleeve can play the role of insulation separation, achieving the formation of at least two layers of insulation separation structure at the end of the battery cell. At the same time, by arranging the reinforcing portion at the outer gasket, the reinforcing portion can improve the structural strength of the outer gasket, effectively reduce the lifting amplitude of the outer gasket under the action of the extrusion force after the heat shrinkage of the sleeve, and prevent the end of the battery cell from being abnormally lifted, thereby ensuring the quality of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0026] Figure 1 is a structural schematic diagram of a battery cell provided by embodiments of the present application;

[0027] Figure 2 is a sectional view of a battery cell provided by embodiments of the present application;

[0028] Figure 3 is provided by an embodiment of the present application Figure 2 is a structural enlarged schematic view of A in the embodiment of the present application;

[0029] Figure 4 is a partial structural schematic view of the battery cell provided by an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0031] The battery cell, the battery and the electric device of the present application will be described below in conjunction with Figures 1 to 4 the drawings.

[0032] According to the embodiments of the first aspect of the present application, as Figure 1 , Figure 2 and Figure 3 , the battery cell comprises a shell 1, a battery cell body 2, a sleeve 3, an outer gasket 4 and a reinforcing part 5, the shell 1 is formed with a mounting cavity 11, the battery cell body 2 is installed in the mounting cavity 11, the sleeve 3 is sleeved on the shell 1, the sleeve 3 comprises a top covering part 31, the top covering part 31 is arranged opposite to the inner bottom wall of the shell 1, the outer gasket 4 is arranged between the shell 1 and the top covering part 31, and the reinforcing part 5 is connected to the outer gasket 4.

[0033] According to the battery cell of the embodiments of the present application, the outer gasket 4 is arranged between the shell 1 and the top covering part 31 of the sleeve 3, and the outer gasket 4 and the sleeve 3 can both play the role of insulation separation, so that at least two layers of insulation separation structures are formed at the end of the battery cell. At the same time, the reinforcing part 5 is arranged at the outer gasket 4, the reinforcing part 5 can improve the structural strength of the outer gasket 4, can effectively reduce the lifting amplitude of the outer gasket 4 under the extrusion of the sleeve 3 after heat shrinkage, and can prevent the end of the battery cell from being abnormally lifted, so as to ensure the quality of the battery cell.

[0034] It can be understood that in the prior art, the outer gasket 4 has a planar structure without the reinforcing portion 5, and in the production process of the battery cell, the sleeve 3 will be heat-shrunk, and the sleeve 3 will extrude the outer gasket 4 after heat-shrinking, causing the outer gasket 4 to be warped, and even causing the warped part of the outer gasket 4 to protrude from the sleeve 3, affecting the normal use of the battery cell. The present application strengthens the structural strength of the outer gasket 4 through the reinforcing portion 5, so that the outer gasket 4 can effectively resist the extrusion force after the heat-shrinking of the sleeve 3, effectively reducing the degree of warping of the outer gasket 4, and even preventing the outer gasket 4 from being warped, avoiding the influence of the warping of the outer gasket 4 on the normal use of the battery cell.

[0035] It can be understood that in the prior art, when the battery cell is tested in a module, the module welding piece will abut against the sleeve 3, and due to the high temperature of the module welding piece, the sleeve 3 may be heat-shrunk or reach a molten state, at which time the module welding piece may come into contact with both the shell 1 and the cap 22 of the battery cell, causing the positive and negative poles of the battery cell to be short-circuited. The present application is provided with the outer gasket 4 between the top covering portion 31 of the sleeve 3 and the shell 1, so that when the sleeve 3 is heat-shrunk or reaches a molten state under the influence of the module welding piece, the outer gasket 4 can play a separating role between the module welding piece and the shell 1, effectively preventing the module welding piece from coming into contact with both the shell 1 and the cap 22, avoiding the short-circuiting of the positive and negative poles of the battery cell, and improving the safety of the battery cell.

[0036] For example, the sleeve 3 is made of insulating material. For example, the sleeve 3 is made of PET material.

[0037] In some embodiments, as Figure 2 and Figure 3 The battery cell body 2 includes an electrode assembly 21 and a cap 22, the electrode assembly 21 is installed in the installation cavity 11, and the electrode assembly 21 is located between the cap 22 and the inner bottom wall of the shell 1.

[0038] One end of the reinforcing portion 5 is connected to the outer gasket 4, and the other end of the reinforcing portion 5 is bent and extends into the installation cavity 11 and abuts against the cap 22.

[0039] It can be understood that when the sleeve 3 is heat-shrunk and applies extrusion force to the outer gasket 4, since the reinforcing portion 5 connects the cap 22 and the outer gasket 4, the reinforcing portion 5 and the cap 22 cooperate to effectively prevent the outer gasket 4 from being warped.

[0040] It should be noted that the present embodiment only illustrates that the other end of the reinforcing portion 5 abuts against the cap 22, and is not specially limited. The other end of the reinforcing portion 5 can also abut against the electrode assembly 21 or any other suitable component.

[0041] In some examples, the reinforcing part 5 can be connected to one side of the outer gasket 4 close to the cap 22, or can be connected to the middle position of the outer gasket 4, and the application does not specially limit the connection position of the reinforcing part 5 and the outer gasket 4.

[0042] In some embodiments, as Figure 3 and Figure 4 , the reinforcing part 5 includes a first connecting part 51 and a second connecting part 52, the first connecting part 51 connects the outer gasket 4 and the second connecting part 52, the second connecting part 52 abuts against the cap 22 at the end away from the first connecting part 51, and a first included angle a is formed between the first connecting part 51 and the outer gasket 4, and a second included angle b is formed between the second connecting part 52 and the first connecting part 51.

[0043] It can be understood that when the outer gasket 4 is buckled due to extrusion force, the included angle between the outer gasket 4 and the first connecting part 51 changes, and the included angle between the second connecting part 52 and the first connecting part 51 also changes, that is, when the outer gasket 4 is buckled, the first connecting part 51 and the second connecting part 52 will exert a force on the outer gasket 4 to prevent the outer gasket 4 from buckling, which can effectively reduce the buckling amplitude of the outer gasket 4 and ensure the quality of the battery cell.

[0044] For example, the first connecting part 51 is connected to the inner side wall of the outer gasket 4.

[0045] In some embodiments, the distance between the outer gasket 4 and the inner bottom wall of the shell 1 is L1, and the distance between the second connecting part 52 and the inner bottom wall of the shell 1 is L2, wherein L1>L2, and the difference between L1 and L2 is between 0.2mm and 0.6mm.

[0046] It can be understood that the second connecting part 52 is closer to the inner bottom wall of the shell 1 relative to the outer gasket 4, that is, when the battery cell is placed vertically and the top covering part 31 of the sleeve 3 is located above the battery cell body 2, the outer gasket 4 is located above the second connecting part 52. Then when the sleeve 3 is heat-shrunk and extrudes the outer gasket 4, the first connecting part 51 and the second connecting part 52 will prevent the outer gasket 4 from buckling, and if the extrusion force applied by the sleeve 3 is large, the second connecting part 52 may be buckled, but since the second connecting part 52 is lower than the outer gasket 4, even if the second connecting part 52 is buckled, it will not protrude from the outer gasket 4 and will not affect the use of the battery cell.

[0047] It can be understood that the distance between the outer gasket 4 and the inner bottom wall of the shell 1 refers to the distance between the side of the outer gasket 4 away from the inner bottom wall of the shell 1 and the inner bottom wall of the shell 1, or the distance between the side of the outer gasket 4 towards the inner bottom wall of the shell 1 and the inner bottom wall of the shell 1. The distance between the second connecting portion 52 and the inner bottom wall of the shell 1 refers to the distance between the side of the second connecting portion 52 away from the inner bottom wall of the shell 1 and the inner bottom wall of the shell 1, or the distance between the side of the second connecting portion 52 towards the inner bottom wall of the shell 1 and the inner bottom wall of the shell 1.

[0048] It can be understood that when the difference between L1 and L2 is less than 0.2 mm, the distance between the second connecting portion 52 and the outer gasket 4 is close, and when the second connecting portion 52 is buckled, the second connecting portion 52 can protrude from the outer gasket 4. When the difference between L1 and L2 is greater than 0.6 mm, it will cause the overall size of the battery cell to be too long. Therefore, the difference between L1 and L2 is set to be between 0.2 mm and 0.6 mm, which not only ensures that the second connecting portion 52 will not protrude from the outer gasket 4 when buckled, but also will not cause the overall size of the battery cell to be too long.

[0049] In some embodiments, as Figure 4 , the inner diameter L3 of the second connecting portion 52 is between 8 mm and 14 mm.

[0050] It can be understood that if the inner diameter of the second connecting portion 52 is less than 8 mm, the second connecting portion 52 can interfere with the installation of the cap 22, and if the inner diameter of the second connecting portion 52 is greater than 14 mm, the second connecting portion 52 can not abut against the cap 22, and the first connecting portion 51 and the second connecting portion 52 are difficult to prevent the outer gasket 4 from buckling, and the second connecting portion 52 can also be too long in radial length, making it easy to buckle and possibly protrude from the outer gasket 4 when buckled. Therefore, the inner diameter of the second connecting portion 52 is set to be between 8 mm and 14 mm, which not only avoids interference with the installation of the cap 22, but also effectively prevents the outer gasket 4 from buckling, ensuring the quality of the battery cell.

[0051] For example, the inner diameter of the second connecting portion 52 is, for example, 11.5 mm.

[0052] In some embodiments, as Figure 4 , the outer diameter L4 of the first connecting portion 51 is between 11 mm and 15 mm.

[0053] It can be understood that if the outer diameter of the first connecting part 51 is less than 11 mm, since the second connecting part 52 is also connected to the first connecting part 51, at this time the second connecting part 52 can interfere with the installation of the cap 22. If the outer diameter of the first connecting part 51 is greater than 15 mm, it can cause the second connecting part 52 to be spaced apart from the cap 22, causing the first connecting part 51 and the second connecting part 52 to be difficult to prevent the outer gasket 4 from being buckled, and can also cause the radial length of the second connecting part 52 to be too long, so that the second connecting part 52 is easy to buckle and can protrude from the outer gasket 4 after buckling. Therefore, the outer diameter of the first connecting part 51 is set to be between 11 mm and 15 mm in the present application, which can effectively prevent the outer gasket 4 from buckling while avoiding interference with the installation of the cap 22, thereby ensuring the quality of the battery cell.

[0054] For example, the outer diameter of the first connecting part 51 is 13.5 mm.

[0055] In some embodiments, as Figure 4 The height H of the reinforcing part 5 is between 0.3 mm and 0.5 mm along the axis of the shell 1.

[0056] It can be understood that if the height of the reinforcing part 5 is less than 0.3 mm, the reinforcing part 5 can have a lower structural reinforcing effect, and the outer gasket 4 can still be buckled to a large extent under the extrusion of the sleeve 3, affecting the quality of the battery cell. If the height of the reinforcing part 5 is greater than 0.5 mm, the reinforcing part 5 can interfere with the installation of the battery cell body 2, such as the cap 22. Therefore, the height of the reinforcing part 5 is set to be between 0.3 mm and 0.5 mm in the present application, which can ensure the reinforcing effect of the reinforcing part 5, effectively reduce the buckling amplitude of the outer gasket 4, and avoid interference with the installation of the battery cell body 2, such as the cap 22.

[0057] For example, the height of the reinforcing part 5 is 0.4 mm.

[0058] In some embodiments, as Figure 4 The thickness h of the outer gasket 4 is between 0.15 mm and 0.25 mm.

[0059] It can be understood that if the thickness of the outer gasket 4 is less than 0.15 mm, the insulation separation effect of the outer gasket 4 is poor, and the module welding piece can melt through the outer gasket 4 during module testing. If the thickness of the outer gasket 4 is greater than 0.25 mm, it can affect the overall size of the battery cell. Therefore, the thickness of the outer gasket 4 is set to be between 0.15 mm and 0.25 mm in the present application, which can ensure the insulation separation effect of the outer gasket 4 while reducing the impact on the overall size of the battery cell.

[0060] For example, the thickness of the outer gasket 4 is 0.2 mm.

[0061] In some embodiments, the outer gasket 4 has an outer diameter L5 between 14mm and 20mm. Figure 4

[0062] It can be understood that if the outer diameter of the outer gasket 4 is less than 14mm, i.e. the outer gasket 4 is arranged close to the center of the installation cavity 11, the outer gasket 4 can interfere with the installation of the battery body 2. If the outer diameter of the outer gasket 4 is greater than 20mm, it can affect the overall size of the battery. Therefore, the outer diameter of the outer gasket 4 is set to be between 14mm and 20mm in the present application, which avoids interference with the installation of the battery body 2 while reducing the impact on the overall size of the battery.

[0063] For example, the outer diameter of the outer gasket 4 is 17mm.

[0064] In some embodiments, the difference between the outer diameter L5 of the outer gasket 4 and the inner diameter L6 of the outer gasket 4 is between 2.5mm and 4.5mm.

[0065] It can be understood that the difference between the outer diameter of the outer gasket 4 and the inner diameter of the outer gasket 4 refers to the length of the outer gasket 4 along the radial direction of the shell 1. If the difference between the outer diameter of the outer gasket 4 and the inner diameter of the outer gasket 4 is less than 2.5mm, the outer gasket 4 is difficult to effectively separate the shell 1 and the module welding piece during module testing. If the difference between the outer diameter of the outer gasket 4 and the inner diameter of the outer gasket 4 is greater than 4.5mm, it is easy to interfere with the installation of the battery body 2. Therefore, the difference between the outer diameter of the outer gasket 4 and the inner diameter of the outer gasket 4 is set to be between 2.5mm and 4.5mm in the present application, which ensures that the outer gasket 4 can effectively separate the shell 1 and the module welding piece while avoiding interference with the installation of the battery body 2.

[0066] For example, the difference between the outer diameter of the outer gasket 4 and the inner diameter of the outer gasket 4 is 3.5mm.

[0067] In some embodiments, the reinforcing portion 5 is integrally formed with the outer gasket 4.

[0068] It can be understood that integrally forming the reinforcing portion 5 and the outer gasket 4 facilitates the production of the battery, making the installation of the outer gasket 4 and the reinforcing portion 5 more convenient.

[0069] It should be noted that the present embodiment only exemplifies the connection method of the reinforcing portion 5 and the outer gasket 4. The reinforcing portion 5 and the outer gasket 4 can also be two independent components that are connected together after being formed separately.

[0070] According to the embodiments of the second aspect of the present application, the battery comprises the above-mentioned battery. ​

[0071] According to the battery of the embodiment of the present application, the outer gasket 4 and the sleeve 3 can both play the role of insulation separation by being arranged between the shell 1 and the top covering part 31 of the sleeve 3, and at least two layers of insulation separation structure are formed at the end of the battery cell. Meanwhile, the reinforcing part 5 is arranged at the outer gasket 4, the reinforcing part 5 can improve the structural strength of the outer gasket 4, can effectively reduce the lifting amplitude of the outer gasket 4 under the extrusion of the sleeve 3 after thermal shrinkage, and can prevent the end of the battery cell from being abnormally lifted, thereby ensuring the quality of the battery cell and improving the quality of the battery.

[0072] According to the embodiment of the third aspect of the present application, the electrical equipment includes the battery described above.

[0073] According to the electrical equipment of the embodiment of the present application, the outer gasket 4 and the sleeve 3 can both play the role of insulation separation by being arranged between the shell 1 and the top covering part 31 of the sleeve 3, and at least two layers of insulation separation structure are formed at the end of the battery cell. Meanwhile, the reinforcing part 5 is arranged at the outer gasket 4, the reinforcing part 5 can improve the structural strength of the outer gasket 4, can effectively reduce the lifting amplitude of the outer gasket 4 under the extrusion of the sleeve 3 after thermal shrinkage, and can prevent the end of the battery cell from being abnormally lifted, thereby ensuring the quality of the battery cell and improving the stability of the electrical equipment.

[0074] It should be noted that the electrical equipment can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the electrical equipment, and the electrical equipment is not specially limited.

[0075] The embodiments of the present application are described in detail above, and the specific examples are applied to the principle and implementation mode of the present application, and the above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A battery cell, characterized in that, include: The housing has a mounting cavity. The battery cell body is installed inside the mounting cavity; A sleeve is fitted onto the housing, the sleeve including a top cover portion, the top cover portion being disposed opposite to the inner bottom wall of the housing; An outer gasket is disposed between the housing and the top cover. The reinforcing part is connected to the outer gasket.

2. The battery cell according to claim 1, characterized in that, The battery cell body includes an electrode assembly and a cap. The electrode assembly is installed in the mounting cavity and is located between the cap and the inner bottom wall of the housing. One end of the reinforcing part is connected to the outer gasket, and the other end of the reinforcing part bends and extends into the mounting cavity and abuts against the cap.

3. The battery cell according to claim 2, characterized in that, The reinforcing part includes a first connecting part and a second connecting part. The first connecting part connects the outer gasket and the second connecting part. The end of the second connecting part away from the first connecting part abuts against the cap. A first angle is formed between the first connecting part and the outer gasket, and a second angle is formed between the second connecting part and the first connecting part.

4. The battery cell according to claim 3, characterized in that, The distance between the outer gasket and the inner bottom wall of the housing is L1, and the distance between the second connecting part and the inner bottom wall of the housing is L2, wherein L1>L2, and the difference between L1 and L2 is between 0.2mm and 0.6mm.

5. The battery cell according to claim 3, characterized in that, The inner diameter of the second connecting part is between 8 mm and 14 mm, and / or the outer diameter of the first connecting part is between 11 mm and 15 mm.

6. The battery cell according to claim 1, characterized in that, Along the axial direction of the housing, the height of the reinforcing portion is between 0.3 mm and 0.5 mm.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the outer gasket is between 0.15mm and 0.25mm; and / or, The outer diameter of the outer gasket is between 14 mm and 20 mm; and / or, The difference between the outer diameter and the inner diameter of the outer gasket is between 2.5 mm and 4.5 mm.

8. The battery cell according to any one of claims 1 to 6, characterized in that, The reinforcing part is integrally formed with the outer gasket.

9. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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