Battery shell

Abstract

The utility model belongs to the technical field of battery manufacturing, and discloses a battery shell, which comprises a main shell, a plastic part and a connecting piece, the main shell is used for placing a pole group, the main shell is provided with a through hole, a tab of the pole group extends out of the through hole, and the tab is arranged outside the main shell, so that the internal space of the main shell can be released, and the pole group can be reasonably placed in the main shell. The plastic part is attached to the face, provided with the through hole, of the main shell, the plastic part comprises a tab through hole and a mounting groove which are parallel to each other, the tab through hole corresponds to the through hole, the connecting piece is placed in the mounting groove, the tab penetrates through the through hole and the tab through hole and is attached to the connecting piece after being bent, and the tab and the connecting piece are welded conveniently. The connecting piece is in interference fit with the mounting groove, so that the connecting piece is stably placed in the mounting groove, the dislocation of the connecting piece when the lithium battery shakes is avoided, the problem that the lithium battery is short-circuited easily due to the deformation of the tab is further avoided, and the use risk of the lithium battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery shell. Background Art

[0002] Lithium batteries, with their advantages of small size, excellent cycle performance, and high energy density, have become the primary power source for new energy vehicles. The stability of lithium batteries is increasingly valued by automakers and battery manufacturers. A lithium battery consists of a housing and an electrode assembly. The housing has an opening through which the electrode assembly can be installed into the housing. The electrode tabs on the electrode assembly are then connected to the poles on the housing via connectors to enable the lithium battery's charging and discharging functions. However, existing lithium batteries have connectors placed inside the housing, making the assembly of the connectors less stable. When new energy vehicles travel over bumpy roads, the lithium battery can shake, causing the connectors to become misaligned and the tabs to deform, potentially causing a short circuit in the battery. This increases the risk of lithium battery use and affects the driving safety of new energy vehicle owners.

[0003] Therefore, there is an urgent need for a battery housing to solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a battery housing that can solve the problem that the connection piece assembly is poorly stable, the connection piece may be misaligned when the lithium battery shakes, resulting in deformation of the tabs, which may easily cause a short circuit in the lithium battery and increase the risk of using the lithium battery.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A battery housing, comprising:

[0007] A main shell is used to house the electrode group. The main shell is provided with a through hole, and the electrode lugs of the electrode group extend out of the through hole.

[0008] A plastic part is fitted with a side of the main housing provided with the through hole, the plastic part comprising a tab through hole and a mounting groove; the tab through hole corresponds to the through hole, and the mounting groove is parallel to the tab through hole;

[0009] A connecting piece is placed in the installation groove, and the connecting piece and the installation groove are interference fitted.

[0010] As a preferred technical solution for the battery housing, the inner wall of the mounting groove is provided with interference ribs; and / or the side wall of the connecting piece is provided with interference ribs.

[0011] As a preferred technical solution for the battery housing, the top surface or the bottom surface of the interference rib is inclined.

[0012] As a preferred technical solution for the battery housing, a plurality of interference ribs are provided, and the plurality of interference ribs are spaced apart on the inner wall of the mounting groove; or, the plurality of interference ribs are spaced apart on the side wall of the connecting piece.

[0013] As a preferred technical solution for the battery housing, at least two interference ribs are provided on each inner wall of the mounting groove; or at least two interference ribs are provided on each side surface of the connecting piece.

[0014] As a preferred technical solution for the battery housing, the interference of the interference rib is 0.05mm-0.3mm.

[0015] As a preferred technical solution for the battery housing, the number of the tab through holes is at least 2.

[0016] As a preferred technical solution for the battery housing, the thickness of the plastic part is 1 mm to 10 mm.

[0017] As an optimal technical solution for the battery housing, an explosion-proof valve is provided on the main housing.

[0018] As an optimal technical solution for the battery housing, a liquid injection hole is provided on the main housing.

[0019] The beneficial effects of the utility model are:

[0020] The battery shell provided by the present invention includes a main shell, a plastic part and a connecting piece. The main shell is used to place the electrode group. A through hole is provided on the main shell. The electrode tab of the electrode group extends out of the through hole. The electrode tab of the electrode group is placed outside the main shell, which can free up space inside the main shell, so that the electrode group in the main shell can be reasonably placed, thereby improving the safety of lithium battery use. The plastic part is fitted with the side of the main shell provided with the through hole. The plastic part includes a through hole for the electrode tab and a mounting groove. The through hole for the electrode tab is provided corresponding to the through hole. The mounting groove is provided parallel to the through hole for the electrode tab. The connecting piece is placed in the mounting groove. The electrode tab passes through the through hole and the through hole for the electrode tab in turn. After being bent, it fits with the connecting piece, which facilitates welding of the two. The connecting piece and the mounting groove are interference fit, which can ensure that the connecting piece is stably placed in the mounting groove, and can avoid the problem of the connecting piece being misaligned when the lithium battery shakes, thereby avoiding the problem of the electrode tab deformation easily causing a short circuit in the lithium battery, reducing the risk of using the lithium battery, and ensuring the driving safety of new energy vehicle owners. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded view of the battery housing provided by the present invention;

[0022] Figure 2 yes Figure 1 A magnified schematic diagram of the middle part;

[0023] Figure 3This is a schematic structural diagram of the battery housing provided by the present invention from a first perspective;

[0024] Figure 4 This is a schematic structural diagram of the battery housing provided by the present invention from a second viewing angle.

[0025] In the picture:

[0026] 1. Main shell; 11. Through hole; 2. Plastic part; 21. Tab through hole; 22. Mounting slot; 3. Connecting piece; 4. Interference rib; 5. Explosion-proof valve; 6. Liquid injection hole. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0028] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0031] like Figures 1 to 4 As shown, this embodiment provides a battery case, including a main case 1, a plastic part 2, and a connecting piece 3. The main case 1 is used to place the electrode group. A through hole 11 is provided on the main case 1. The electrode tab of the electrode group extends out of the through hole 11. Placing the electrode tab of the electrode group outside the main case 1 can free up space inside the main case 1. The electrode group in the main case 1 can be reasonably placed, improving the safety of lithium batteries. The plastic part 2 is in contact with the side of the main case 1 where the through hole 11 is provided. The plastic part 2 includes a through hole 21 for the electrode tab and a mounting groove 22. The through hole 21 for the electrode tab is provided corresponding to the through hole 11. The mounting groove 22 is provided parallel to the through hole 21 for the electrode tab. The connecting piece 3 is placed in the mounting groove 22. The electrode tab passes through the through hole 11 and the through hole 21 in sequence. After being bent, it is in contact with the connecting piece 3, facilitating welding of the two. The connecting piece 3 and the mounting groove 22 are interference fit, which can enable the connecting piece 3 to be stably placed in the mounting groove 22, thereby avoiding the problem of the connecting piece 3 being misplaced when the lithium battery shakes, and thus avoiding the problem of the lithium battery short circuit caused by the deformation of the tab, reducing the risk of using the lithium battery and ensuring the driving safety of new energy vehicle owners.

[0032] In this embodiment, the battery housing further includes a cover plate (not shown), which is connected to the side of the main housing 1 having the through hole 11, so as to protect the plastic part 2 and the connecting piece 3 within the space formed by the cover plate and the main housing 1. Specifically, the cover plate and the main housing 1 are welded to each other.

[0033] Regarding the interference fit between the mounting groove 22 and the connecting piece 3, in this embodiment, interference ribs 4 are provided on the inner wall of the mounting groove 22. When the worker installs the connecting piece 3 into the mounting groove 22, the side wall of the connecting piece 3 and the interference ribs 4 abut against each other, and the two are now interference-fitted. Of course, the interference ribs 4 can also be provided on the side wall of the connecting piece 3 to achieve an interference fit after the connecting piece 3 is placed in the mounting groove 22. Of course, the interference ribs 4 can also be provided on both the inner wall of the mounting groove 22 and the side wall of the connecting piece 3 to achieve an interference fit after assembly.

[0034] Preferably, the top or bottom surface of the interference rib 4 is inclined, that is, the top or bottom surface of the interference rib 4 is a bevel. When the interference rib 4 is set on the inner wall of the installation groove 22, the top surface of the interference rib 4 is a bevel; when the interference rib 4 is set on the side wall of the connecting piece 3, the bottom surface of the interference rib 4 is a bevel. In this way, when the staff assembles the connecting piece 3, the connecting piece 3 can pass through the top or bottom surface of the interference rib 4 and enter the installation groove 22. The top or bottom surface of the interference rib 4 is set as a bevel, which can serve as a guide when assembling the connecting piece 3, allowing the staff to assemble the connecting piece 3 into the installation groove 22 more smoothly and quickly.

[0035] In this embodiment, multiple interference ribs 4 are provided. When the interference ribs 4 are provided on the inner wall of the mounting groove 22, the multiple interference ribs 4 are spaced apart. When the multiple interference ribs 4 are provided on the side of the connecting piece 3, the multiple interference ribs 4 are also spaced apart. Providing multiple interference ribs 4 allows the connecting piece 3 to achieve a multi-point interference fit with the mounting groove 22, which can make the connecting piece 3 more stably assembled in the mounting groove 22 and ensure the safety of the lithium battery. Specifically, when multiple interference ribs 4 are provided on the inner wall of the mounting groove 22, at least two interference ribs 4 are spaced apart on each inner wall of the mounting groove 22 to improve the uniformity and rationality of the layout of the interference ribs 4 in the mounting groove 22, further ensuring the stability of the assembly of the connecting piece 3 and the mounting groove 22. When multiple interference ribs 4 are provided on the side wall of the connecting piece 3, at least two interference ribs 4 are spaced apart on each side of the connecting piece 3.

[0036] Preferably, when the interference rib 4 is provided on the inner wall of the mounting groove 22, the interference rib 4 and the inner wall of the mounting groove 22 are an integral structure, which not only facilitates the processing of the plastic part 2, but also further improves the stability of the assembly of the connecting piece 3 and the mounting groove 22. When the interference rib 4 is provided on the side wall of the connecting piece 3, the interference rib 4 and the connecting piece 3 are an integral structure.

[0037] Preferably, the interference margin of the interference rib 4 is 0.05mm-0.3mm. That is, the interference rib 4 protrudes from the inner wall of the mounting groove 22 or the side wall of the connecting piece 3 by 0.05mm-0.3mm. This ensures that the connecting piece 3 is positioned within the mounting groove 22 while ensuring a stable assembly of the two. Of course, the interference margin of the interference rib 4 can be adjusted accordingly depending on the specifications of the connecting piece 3 and the mounting groove 22. There is no specific limitation on the interference margin of the interference rib 4 herein.

[0038] Preferably, the cross-sectional shape of the interference rib 4 is rectangular to facilitate processing of the interference rib 4. The cross-sectional shape of the interference rib 4 may also be other regular shapes, such as a pentagon, a hexagon, etc. Of course, the cross-sectional shape of the interference rib 4 may also be an irregular shape, such as a closed shape with a wavy surface. The shape of the interference rib 4 is not specifically limited herein.

[0039] In this embodiment, the main housing 1 has at least two tab through-holes 21. The number of tab through-holes 21 varies depending on the design of the lithium battery. If only a positive electrode or a negative electrode is designed on the main housing 1, one tab through-hole 21 can be provided on both sides of the positive electrode or the negative electrode respectively. If a positive electrode is provided on one side of the main housing 1 and a negative electrode is provided on the other side, one tab through-hole 21 needs to be provided on both sides of the positive electrode and one tab through-hole 21 needs to be provided on both sides of the negative electrode respectively. Therefore, there is no specific limitation on the number of tab through-holes 21.

[0040] In this embodiment, the thickness of the plastic part 2 is 1mm-10mm. If the thickness of the plastic part 2 is too small, after the cover plate is connected to the main shell 1, the plastic part 2 cannot be stably placed in the placement space formed by the main shell 1 and the cover plate, and the position of the connecting piece 3 cannot be fixed. This may increase the risk of using the lithium battery. If the plastic part 2 is too thick, the overall weight of the lithium battery will be too high, and the manufacturing cost will increase. It will also affect the connection between the cover plate and the main shell 1. Depending on the design of the lithium battery, the thickness of the plastic part 2 is also different. The thickness of the plastic part 2 can be 2mm, 4mm, 6mm or 8mm, and there is no specific limitation here.

[0041] like Figure 3 and Figure 4 As shown, in this embodiment, an explosion-proof valve 5 is provided on the main housing 1. When a lithium battery experiences an abnormality, reactions may occur within the battery, such as electrolyte evaporation, electrolyte oxidation and decomposition, or reactions between the negative electrode and the electrolyte. These reactions generate a large amount of gas within the battery. The provision of the explosion-proof valve 5 allows the release of the gas generated within the battery, reducing the risk of explosion. The specific structure and principle of the explosion-proof valve 5 can be referenced in the prior art and are not the focus of this embodiment, so they will not be further described here.

[0042] Preferably, the main housing 1 is further provided with an injection port 6. This facilitates the injection of electrolyte into the lithium battery according to the required amount, ensuring the battery's usability. Furthermore, when the electrolyte in the lithium battery needs to be replenished, the replenished electrolyte can be injected into the lithium battery through the injection port 6, allowing the battery to continue to be used.

[0043] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery housing, characterized in that: include: A main housing (1) is used to house the pole group, the main housing (1) is provided with a through hole (11), and the pole lugs of the pole group extend out of the through hole (11); A plastic part (2) is fitted with a surface of the main housing (1) provided with the through hole (11), and the plastic part (2) includes a tab through hole (21) and a mounting groove (22); the tab through hole (21) corresponds to the through hole (11), and the mounting groove (22) is parallel to the tab through hole (21); A connecting piece (3) is placed in the installation groove (22), and the connecting piece (3) and the installation groove (22) are interference fitted.

2. The battery case according to claim 1, wherein: The inner wall of the installation groove (22) is provided with an interference rib (4); and / or the side wall of the connecting piece (3) is provided with an interference rib (4).

3. The battery case according to claim 2, characterized in that The top surface or bottom surface of the interference rib (4) is arranged inclined.

4. The battery case according to claim 3, characterized in that There are multiple interference ribs (4), and the multiple interference ribs (4) are spaced apart on the inner wall of the mounting groove (22); or, the multiple interference ribs (4) are spaced apart on the side wall of the connecting piece (3).

5. The battery case according to claim 4, characterized in that At least two interference ribs (4) are provided on each inner wall of the installation groove (22); or at least two interference ribs (4) are provided on each side surface of the connecting piece (3).

6. The battery case according to claim 2, characterized in that The interference amount of the interference rib (4) is 0.05mm-0.3mm.

7. The battery housing according to any one of claims 1 to 6, characterized in that: The number of the tab through holes (21) is at least 2.

8. The battery housing according to any one of claims 1 to 6, characterized in that: The thickness of the plastic part (2) is 1 mm to 10 mm.

9. The battery housing according to any one of claims 1 to 6, characterized in that: An explosion-proof valve (5) is provided on the main housing (1).

10. The battery housing according to any one of claims 1 to 6, characterized in that: The main housing (1) is provided with a liquid injection hole (6).

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