Battery shell and battery

Abstract

The utility model discloses a battery shell and a battery, and belongs to the technical field of batteries. The battery shell comprises a bottom plate and a plurality of side plates; the plurality of side plates are sequentially connected end to end to form a hollow shell-shaped structure with openings at two ends, and the bottom plate covers the opening at one end of the hollow shell-shaped structure; a concave area is formed in the position, close to the bottom plate, of at least one side plate and used for containing the overlapping section of the insulating film. According to the battery shell, the sunken area is arranged on at least one side plate and can be used for accommodating the overlapping section of the insulating film, so that the thickness of the overlapping section protruding out of the surface of the corresponding side plate is reduced or even eliminated, the probability that the overlapping section is warped due to scratching is reduced, and the insulation reliability of the whole battery during use can be improved; in addition, the overlapping section is accommodated in the sunken region, so that the insulating film can be prevented from occupying extra space in the thickness direction, and the energy density of the battery is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery casing and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in mobile electronic devices such as Bluetooth headsets, mobile phones, laptops, tablets, and cameras, as well as portable power banks, due to their advantages such as high energy density, long charge-discharge life, low self-discharge rate, and small size and weight. Among them, square aluminum-cased lithium-ion batteries use aluminum alloy as the raw material for the battery casing, which has advantages such as light weight, high safety, ease of processing and forming, excellent conductivity, and strong corrosion resistance.

[0003] The manufacturing steps for a square aluminum-cased lithium-ion battery are as follows: 1) The aluminum plate is stretched and formed into a rectangular aluminum casing through multiple stages; 2) The battery cell is placed inside the aluminum casing to form a single battery cell; 3) An insulating blue film is wrapped around the outside of the single battery cell. The insulating blue film serves to provide insulation, waterproofing, and aesthetics. However, after the insulating blue film is applied, an overlapping section is formed on one side of the aluminum casing. This overlapping section increases the local thickness of the aluminum-cased battery, creating a thickness difference between the overlapping section and other parts of the battery. On the one hand, this makes the overlapping section prone to cracking when the aluminum-cased battery is scratched, affecting the overall coverage of the aluminum casing; on the other hand, it also reduces the volumetric energy density of the single battery cell.

[0004] Therefore, there is an urgent need for a battery casing to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this invention is to provide a battery casing and battery that can effectively reduce the probability of overlapping sections warping or cracking due to scratches, and can improve the insulation reliability of the battery during use.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A battery casing includes a bottom plate and several side plates, the side plates being connected end to end to form a hollow shell structure with openings at both ends, and the bottom plate covering one opening of the hollow shell structure.

[0008] At least one of the side plates has a recessed area formed near the base plate, the recessed area being used to accommodate an overlapping section of the insulating film.

[0009] As a preferred embodiment of the battery casing provided by this utility model, the side plate includes alternating first side plate and second side plate, and at least one of the first side plate is provided with the recessed area.

[0010] As a preferred embodiment of the battery casing provided by this utility model, the first side plate with the recessed area includes a first part and a second part. The first part is connected to the bottom plate, and the second part is located at the end of the first part away from the bottom plate. The thickness of the first part is less than the thickness of the second part, and the recessed area is formed on the outer side of the first part.

[0011] As a preferred embodiment of the battery casing provided by this utility model, the first side plate having the recessed area further includes an intermediate portion connected between the first portion and the second portion. The thickness of the intermediate portion gradually decreases towards the first portion. The thickness of the intermediate portion at the end near the first portion is the same as the thickness of the first portion, and the thickness of the intermediate portion at the end near the second portion is the same as the thickness of the second portion.

[0012] As a preferred embodiment of the battery casing provided by this utility model, the thickness of the side plate with the recessed area gradually decreases towards the bottom plate.

[0013] As a preferred embodiment of the battery casing provided by this utility model, the width of the first side plate is smaller than the width of the second side plate.

[0014] As a preferred embodiment of the battery casing provided by this utility model, the thickness H1 of the first side plate away from the bottom plate is 0.7mm to 1.0mm; and / or the thickness H2 of the first side plate near the bottom plate is 0.5mm to 0.7mm.

[0015] As a preferred embodiment of the battery casing provided by this utility model, the thickness H3 of the second side plate is 0.5mm to 0.6mm.

[0016] As a preferred embodiment of the battery casing provided by this utility model, the width of the first side plate is greater than the width of the second side plate.

[0017] This utility model also provides a battery, including a battery cell, an insulating film, and a battery casing as described above. The battery cell is housed within the battery casing, the insulating film covers the outside of the battery casing, and the overlapping section of the insulating film is located in the recessed area of ​​the battery casing.

[0018] The beneficial effects of this utility model are as follows:

[0019] The battery casing provided by this utility model forms an accommodating space for housing the battery cell by surrounding several side plates and a bottom plate, thereby accommodating and protecting the battery cell and preventing damage caused by external expansion, compression, or vibration. By providing a recessed area on at least one side plate, it can accommodate the overlapping section of the insulating film, thereby reducing or even eliminating the thickness of the overlapping section protruding from the surface of the corresponding side plate, thus reducing the probability of the overlapping section lifting due to scratches, and thus improving the insulation reliability of the entire battery during use. In addition, by accommodating the overlapping section in the recessed area, it can also prevent the insulating film from occupying additional space in the thickness direction, thereby effectively improving the energy density of the battery.

[0020] The battery provided in this embodiment, by applying the battery casing described above, can effectively reduce the probability of the overlapping sections of the insulating film peeling or cracking due to scratches, thereby improving the insulation reliability of the battery during use and effectively increasing the energy density of the battery. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the battery structure provided by this utility model;

[0023] Figure 2 This is a cross-sectional view of the battery casing provided in Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the first side plate provided in Embodiment 1 of this utility model;

[0025] Figure 4 This is a cross-sectional view of the battery casing provided in Embodiment 2 of this utility model;

[0026] Figure 5 This is a cross-sectional view of the battery casing provided in Embodiment 3 of this utility model.

[0027] Figure label:

[0028] 100. Battery casing; 200. Top cover;

[0029] 10. First side plate; 101. Recessed area; 11. First part; 12. Second part; 13. Middle part;

[0030] 20. Second side panel;

[0031] 30. Base plate. Detailed Implementation

[0032] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0033] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0034] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0035] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0036] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0037] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0038] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0039] Figure 1 A schematic diagram of the battery structure provided by this utility model is shown. Figure 1 As shown, this utility model provides a battery, which includes a battery casing 100, a top cover 200, and a battery cell (not shown in the figure). The battery casing 100 has an opening on one side, and the battery cell is housed within the battery casing 100. The top cover 200 seals the opening of the battery casing 100 to ensure the battery's airtightness. In this embodiment, the battery is a prismatic battery. The battery casing 100 is generally a rectangular cavity structure with an opening at one end, allowing the battery cell to be inserted into the cavity of the battery casing 100 through the opening. The battery casing 100 and the top cover 200 serve to house and protect the battery cell. On the one hand, they resist external expansion, compression, or vibration to prevent damage to the battery cell; on the other hand, they ensure the battery's airtightness to prevent electrolyte leakage, thereby ensuring the battery's safety in use.

[0040] In this embodiment, the battery casing 100 is made of aluminum. Aluminum casings have the advantages of being lightweight, highly safe, having good heat dissipation, excellent electrical conductivity, strong corrosion resistance, and being easy to process and form. Optionally, the battery casing 100 is formed from an aluminum plate through multi-stage stretching. The stretching process has the advantages of high forming precision, good surface quality, high material utilization, and high production efficiency.

[0041] Of course, in other embodiments, the battery casing 100 may also be made of other metal materials, and this embodiment does not limit this.

[0042] The battery also includes an insulating film that covers the battery casing 100. The insulating film serves to provide insulation, waterproofing, and aesthetics. Furthermore, this invention also provides a battery casing 100, the specific structure of which will be described in detail below through several embodiments.

[0043] Example 1

[0044] Figure 2 A cross-sectional view of the battery casing 100 provided in this embodiment is shown. Figure 2 and combined Figure 1 As shown, this embodiment provides a battery casing 100, which includes a base plate 30 and several side plates. The side plates are connected end to end to form a hollow shell structure with openings at both ends. The base plate 30 covers one opening of the hollow shell structure. At least one side plate has a recessed area 101 near the base plate 30, which is used to accommodate overlapping sections of the insulating film. A top cover 200 covers the other opening of the hollow shell structure to ensure the overall airtightness of the battery.

[0045] It should be explained that after the insulating film is wrapped around the battery casing 100, an overlapping section will be formed on one side of the battery casing 100. The battery casing 100 provided in this embodiment forms an accommodating space for housing the battery cell by means of a bottom plate 30 and several side plates, so as to realize the housing and protection of the battery cell and avoid damage to the battery cell due to external expansion, compression or vibration. By providing a recessed area 101 on at least one side plate, it can be used to accommodate the overlapping section of the insulating film, thereby reducing or even eliminating the thickness of the overlapping section protruding from the surface of the corresponding side plate, thereby reducing the probability of the overlapping section lifting due to scratches, and thus improving the insulation reliability of the entire battery during use. In addition, by accommodating the overlapping section in the recessed area 101, it is also possible to avoid the insulating film occupying additional space in the thickness direction, thereby effectively improving the energy density of the battery.

[0046] Optionally, the side plate includes alternating first side plates 10 and second side plates 20, and at least one first side plate 10 is provided with the aforementioned recessed area 101. For example... Figure 1 and Figure 2As shown, in this embodiment, there are two first side plates 10 and two second side plates 20, forming a hollow cuboid shell structure. Each of the two first side plates 10 has a recessed area 101, allowing the operator to finish wrapping the insulating film at any of the recessed areas 101 on either first side plate 10, increasing flexibility during the wrapping process. Of course, this embodiment does not limit the number of first side plates 10 and second side plates 20; designers can adjust the number of first side plates 10 and second side plates 20 according to actual processing requirements. Furthermore, designers can provide recessed areas 101 on all first side plates 10; or provide recessed areas 101 on some first side plates 10, while not providing recessed areas 101 on the remaining first side plates 10.

[0047] Figure 3 A schematic diagram of the structure of the first side plate 10 provided in this embodiment is shown. Figure 3 and combined Figure 2 As shown, the first side plate 10 with the recessed area 101 includes a first part 11 and a second part 12. The first part 11 is connected to the bottom plate 30, and the second part 12 is located at the end of the first part 11 away from the bottom plate 30. The thickness of the first part 11 is less than the thickness of the second part 12, and the recessed area 101 is formed on the outer side of the first part 11. By setting the thickness of the first part 11 to be less than the thickness of the second part 12, the outer wall of the first side plate 10 at the end away from the bottom plate 30 protrudes from the outer wall of the first side plate 10 at the end near the bottom plate 30, thereby forming the recessed area 101 on the outer side of the first part 11. The structure is simple and easy to process and form.

[0048] Furthermore, the first side plate 10 with the recessed area 101 also includes an intermediate portion 13 connecting the first part 11 and the second part 12. The thickness of the intermediate portion 13 gradually decreases towards the first part 11, with the thickness of the end of the intermediate portion 13 near the first part 11 being the same as the thickness of the first part 11, and the thickness of the end of the intermediate portion 13 near the second part 12 being the same as the thickness of the second part 12. With this arrangement, the intermediate portion 13 serves as a transition between the first part 11 and the second part 12, preventing the first side plate 10 from breaking due to a sudden change in thickness, thereby ensuring the structural strength of the battery casing 100.

[0049] In this embodiment, the width of the first side plate 10 is smaller than the width of the second side plate 20. That is, the recessed area 101 is formed on the side plate with a smaller area on the battery casing 100. This design can minimize the area of ​​the recessed area 101 (i.e., the area of ​​the thinned portion on the first side plate 10 is smaller), thereby reducing the impact of the thinning of the battery casing 100 on its support performance.

[0050] like Figure 3 As shown, the thickness H1 of the first side plate 10 away from the bottom plate 30 is 0.7mm to 1.0mm; the thickness H2 of the first side plate 10 near the bottom plate 30 is 0.5mm to 0.7mm. Simulation and experimental verification show that the above thickness range ensures that while the thickness of the first side plate 10 is partially reduced to form the recessed area 101, it does not affect the overall supporting strength of the battery casing 100. For example, H1 can be 0.72mm, 0.74mm, 0.75mm, 0.76mm, 0.78mm, 0.8mm, 0.82mm, 0.84mm, 0.85mm, 0.86mm, 0.88mm, 0.9mm, 0.92mm, 0.94mm, 0.95mm, 0.96mm, 0.98mm, etc. H2 can be 0.52mm, 0.54mm, 0.55mm, 0.56mm, 0.58mm, 0.6mm, 0.62mm, 0.64mm, 0.65mm, 0.66mm, 0.68mm, 0.7mm, 0.72mm, 0.74mm, 0.75mm, 0.76mm, 0.78mm, etc. Of course, in other embodiments, the specific values ​​of H1 and H2 are not limited to the above ranges, and designers can adjust the specific values ​​of H1 and H2 according to actual processing requirements.

[0051] Optionally, the thickness H3 of the second side plate 20 is 0.5mm to 0.6mm. This thickness range of the second side plate 20 can ensure the structural strength of the entire battery casing 100. For example, H3 can be 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, etc. Of course, in other embodiments, the specific value of H3 is not limited to the above range, and designers can adjust the specific value of H3 according to actual processing requirements.

[0052] Continue as Figures 1-3 As shown, the insulating film (not shown) includes an integrally formed base film, a first side film, a second side film, and a bent film. The first and second side films are alternately connected to the four sides of the base film, and a bent film is disposed between adjacent first and second side films. When the insulating film is wrapped around the battery casing 100, the base film is adhered to the base plate 30, the first side film is adhered to the first side plate 10, the second side film is adhered to the second side plate 20, and the bent film forms an overlapping section after the first and second side films are adhered, and is bent along the junction of the first side plate 10 and the second side plate 20 and accommodated in the recessed area 101 of the first side plate 10.

[0053] Optionally, the battery also includes an insulating sheet (not shown in the figure), which is disposed on the top cover 200. The ends of the first side film and the second side film near the top cover 200 are bent and pasted onto the top cover 200, and are located between the top cover 200 and the insulating sheet, thereby achieving insulation protection for the top of the battery.

[0054] Example 2

[0055] This embodiment provides a battery housing 100, the specific structure of which is roughly the same as that of the battery housing 100 in Embodiment 1, the difference being that the recessed area 101 is formed in a different way.

[0056] Figure 4 A cross-sectional view of the battery casing 100 provided in this embodiment is shown. Figure 4 As shown, in this embodiment, the thickness of the side plate (i.e., the first side plate 10) with the recessed area 101 gradually decreases towards the bottom plate 30. That is, the entire outer surface of the first side plate 10 gradually recesses into the battery casing 100 from top to bottom, thereby forming the aforementioned recessed area 101 on the side of the first side plate 10 near the bottom plate 30. This design reduces the thickness reduction rate of the first side plate 10, ensuring that the thickness of the first side plate 10 gradually decreases from top to bottom, thus preventing breakage due to abrupt changes in thickness and ensuring the structural strength of the battery casing 100.

[0057] Example 3

[0058] This embodiment provides a battery housing 100, the specific structure of which is roughly the same as that of the battery housing 100 in Embodiment 1, the difference being that the number of recessed areas 101 is different.

[0059] Figure 5 A cross-sectional view of the battery casing 100 provided in this embodiment is shown. Figure 5 As shown, in this embodiment, there are two first side plates 10 and two second side plates 20, which together form a hollow cuboid shell structure. One of the two first side plates 10 has a recessed area 101 to accommodate the overlapping section of the insulating film. This design reduces the number of thinner first side plates 10, thereby ensuring the supporting strength of the battery casing 100.

[0060] Example 4

[0061] This embodiment provides a battery housing 100, the specific structure of which is roughly the same as that of the battery housing 100 in Embodiment 1, the difference being that the recessed area 101 is located in a different position.

[0062] Specifically, refer to Figure 1 and Figure 2 In this embodiment, the width of the first side plate 10 is greater than the width of the second side plate 20. That is, the recessed area 101 is formed on the side plate with a larger area on the battery casing 100, and the area occupied by the overlapping section of the insulating film on the first side plate 10 is a small proportion of the entire first side plate 10, thereby reducing the probability of the overlapping section being cracked by impact, and further ensuring the overall safety of the battery.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A battery case characterized by comprising: The battery shell comprises a bottom plate (30) and a plurality of side plates connected in sequence to form a hollow shell structure with both ends open, and the bottom plate (30) is arranged at one end of the hollow shell structure. At least one side plate near the bottom plate (30) is provided with a recessed area (101) for accommodating an overlapping section of an insulation film.

2. The battery case according to claim 1, characterized by The side plates comprise first side plates (10) and second side plates (20) connected alternately, and at least one first side plate (10) is provided with the recessed area (101).

3. The battery case according to claim 2, characterized by The first side plate (10) provided with the recessed area (101) comprises a first part (11) connected with the bottom plate (30) and a second part (12) located at an end of the first part (11) away from the bottom plate (30), the thickness of the first part (11) is smaller than that of the second part (12), and the outer side of the first part (11) forms the recessed area (101).

4. The battery case according to claim 3, characterized by The first side plate (10) provided with the recessed area (101) further comprises an intermediate part (13) connected between the first part (11) and the second part (12), the thickness of the intermediate part (13) gradually decreases towards the first part (11), the thickness of an end of the intermediate part (13) near the first part (11) is the same as that of the first part (11), and the thickness of an end of the intermediate part (13) near the second part (12) is the same as that of the second part (12).

5. The battery case of claim 1, wherein, The thickness of the side plate provided with the recessed area (101) gradually decreases towards the bottom plate (30).

6. The battery case according to any one of claims 2 to 4, characterized by The width of the first side plate (10) is smaller than that of the second side plate (20).

7. The battery case of claim 6, wherein, The thickness H1 of an end of the first side plate (10) away from the bottom plate (30) is 0.7mm-1.0mm, and / or the thickness H2 of an end of the first side plate (10) near the bottom plate (30) is 0.5mm-0.7mm.

8. The battery case of claim 7, wherein, The thickness H3 of the second side plate (20) is 0.5mm-0.6mm.

9. The battery case according to any one of claims 2 to 4, characterized by The width of the first side plate (10) is greater than that of the second side plate (20).

10. A battery, characterized by The battery shell comprises a bottom plate (30) and a plurality of side plates connected in sequence to form a hollow shell structure with both ends open, and the bottom plate (30) is arranged at one end of the hollow shell structure. The battery shell comprises a bottom plate (30) and a plurality of side plates connected in sequence to form a hollow shell structure with both ends open, and the bottom plate (30) is arranged at one end of the hollow shell structure.

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