Battery shell and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell assembly, a sealing assembly and a sealing element, the shell assembly comprises a shell body and a cover plate body, the wall surface of the shell body opposite to an opening and / or the cover plate body are / is provided with a welding through hole, the welding through hole is of a step structure, and the sealing element is arranged in the welding through hole. The sealing assembly comprises a sealing plate and an insulating plate, the sealing plate is welded to the shell body and / or the cover plate body and used for sealing the welding through hole, and the sealing piece is used for sealing a gap between the sealing plate and the limiting step. By arranging the sealing piece for sealing the gap between the sealing plate and the limiting step, second sealing is formed on the basis that the sealing plate and the shell body or the cover plate body are welded for sealing and sealing, even if air holes exist in a welding seam after welding, external moisture can be blocked by the sealing piece, the insulating plate is prevented from being corroded, and the service life of the insulating plate is prolonged. And the sealing performance is higher, and the service life of the product is prolonged.

Description

Technical Field

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

[0002] Traditional battery structures typically involve first assembling the electrode assembly into the battery casing. Then, the positive and negative tabs of the electrode assembly are bent multiple times to form an approximate S-shape. Next, a cover assembly with terminals is inserted into the opening of the battery casing, and the corresponding polarity tabs are welded to the terminals. After the tabs and terminals are welded, the battery casing is then welded to the aluminum plate in the cover assembly to seal the battery casing, thus completing the battery assembly. However, this structure requires welding the tabs and terminals before welding the aluminum plate to the casing, which can lead to high temperatures and vibrations during the welding process, affecting the welding quality between the tabs and terminals.

[0003] Therefore, in order to improve the welding quality between the battery tabs and terminals in the traditional structure, the structure is improved by creating a welding window for the tabs in advance on the aluminum plate. This allows the welding of the tabs to be performed after the aluminum plate is welded to the outer casing, thus improving the welding quality. After the tab welding is completed, the metal plate is welded to the aluminum plate to close and seal the welding window. A plastic insulating plate is also installed on the side of the metal plate facing the tabs to prevent accidental contact between the tabs and the metal structure, which could lead to a short circuit.

[0004] However, when welding metal plates to close and seal the working window by welding with aluminum plates, the weld seam may contain pores. This can cause external moisture to corrode the plastic insulation board through the pores, reducing the insulation and protection performance of the tabs. Therefore, relying solely on welding for sealing results in poor sealing performance and a short product lifespan. Utility Model Content

[0005] The purpose of this utility model is to provide a battery casing and battery with good sealing performance and long product service life.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, a battery casing and casing assembly are provided. The casing assembly includes a casing body and a cover plate body. The casing body has at least one opening. The cover plate body corresponds one-to-one with the opening of the casing body and is used to close the opening of the casing body. The wall surface of the casing body opposite to the opening and / or the cover plate body has a welding through hole for welding tabs. The welding through hole has a stepped structure including a first hole segment and a second hole segment, and a limiting step is formed between the first hole segment and the second hole segment.

[0008] A sealing assembly, comprising a sealing plate and an insulating plate, wherein the sealing plate is inserted into the first hole segment and abuts against the limiting step, the insulating plate is disposed on the side of the sealing plate facing the electrode tab and is inserted into the second hole segment, and the sealing plate is welded to the outer shell body and / or the cover plate body to seal the welding through hole;

[0009] A sealing element for sealing the gap between the sealing plate and the limiting step.

[0010] Optionally, the sealing plate includes a sealing part and a plug-in part. The sealing part is inserted into the first hole and abuts against the limiting step. The plug-in part is located on the side of the sealing part facing the limiting step and is inserted into the second hole. The insulating plate is located on the side of the plug-in part away from the sealing part.

[0011] Optionally, the sealing element includes a first sealing portion and a through-hole penetrating the first sealing portion, the first sealing portion being sandwiched between the closing portion and the limiting step, and the through-hole portion being inserted into the second hole segment through the first sealing portion.

[0012] Optionally, the thickness of the closure portion and the first sealing portion along the first direction does not exceed the depth of the first hole segment along the first direction.

[0013] Optionally, the seal further includes a second sealing portion, which is continuously disposed around the circumferential edge of the insertion hole, the second sealing portion being inserted into the second hole segment and covering the outer periphery of the insertion portion.

[0014] Optionally, the outer casing body and the wall opposite the opening, and / or the cover plate body are provided with a mounting boss, the mounting boss protruding in a direction away from the electrode tab, and the stepped welding through hole is opened on the mounting boss.

[0015] Optionally, the thermal conductivity of the seal is lower than that of the insulating plate.

[0016] Optionally, the projection of the seal onto the sealing plate along the first direction is racetrack-shaped, rectangular, or circular.

[0017] Optionally, the seal is integrally molded using an injection molding process.

[0018] On the other hand, a battery is provided, the battery including an electrode assembly and a battery housing as described in any of the preceding claims, the electrode assembly being disposed within the battery housing.

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

[0020] This utility model provides a battery casing with a stepped welded through hole formed by a first hole segment and a second hole segment on the wall surface opposite the opening of the casing body and / or the cover plate body. This creates a limiting step within the welded through hole that abuts against the sealing plate. By providing a sealing element to seal the gap between the sealing plate and the limiting step, a second seal is formed on top of the sealing and closure achieved by welding the sealing plate to the casing body or cover plate body. Even if there are pores in the weld after welding, external moisture will be blocked by the sealing element, thus avoiding the problem of external moisture corroding the insulation plate. This provides high sealing performance and extends the product's service life.

[0021] This utility model also provides a battery that, by applying the aforementioned battery casing, ensures the sealing of the welded through-holes after the sealing plate is welded, prevents the insulation plate from being corroded, extends the product's service life, and improves the product's quality. Attached Figure Description

[0022] Figure 1 This is a partial structural cross-sectional view of the battery casing sealing assembly, seal, and casing body provided by this utility model.

[0023] Figure 2 This is a partial structural cross-sectional view of the battery casing sealing assembly, sealing element and cover plate body provided by this utility model;

[0024] Figure 3 This is an exploded view of the battery structure provided by this utility model;

[0025] Figure 4 yes Figure 3 Enlarged view of the structure of part A in the middle.

[0026] In the picture:

[0027] 100, electrode; 200, electrode group;

[0028] 1. Housing assembly; 11. Outer shell body; 12. Cover plate body; 13. Welding through hole; 131. First hole section; 132. Second hole section; 133. Limiting step; 14. Mounting boss;

[0029] 2. Enclosure component; 21. Enclosure plate; 211. Enclosure part; 212. Connecting part; 22. Insulating plate;

[0030] 3. Sealing element; 31. First sealing part; 32. Second sealing part. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] When a metal plate is welded to a bare aluminum plate to close and seal the work window, the weld seam may contain pores, which can cause external moisture to corrode the plastic insulation board.

[0036] Therefore, in order to improve the sealing performance after sealing and extend the service life of the product, this embodiment provides a battery casing.

[0037] like Figures 1 to 4 As shown, the battery casing includes a casing assembly 1, a sealing assembly 2, and a sealing element 3. The casing assembly 1 includes a casing body 11 and a cover plate body 12. The casing body 11 has at least one opening. The cover plate body 12 corresponds to one of the openings of the casing body 11 and is used to close the openings of the casing body 11. The wall surface of the casing body 11 opposite to the opening, and / or, the cover plate body 12 has a welding through hole 13 for welding the tab 100. The welding through hole 13 has a stepped structure including a first hole segment 131 and a second hole segment 132. A limiting step 133 is formed between the first hole segment 131 and the second hole segment 132. The sealing assembly 2 includes a sealing plate 21 and an insulating plate 22. The sealing plate 21 is inserted into the first hole segment 131 and abuts against the limiting step 133. The insulating plate 22 is located on the side of the sealing plate 21 facing the tab 100 and is inserted into the second hole segment 132. The sealing plate 21 is welded to the outer shell body 11 and / or the cover plate body 12 to seal the welding through hole 13. The sealing member 3 is used to seal the gap between the sealing plate 21 and the limiting step 133.

[0038] The battery casing has a stepped welded through hole 13 formed by a first hole segment 131 and a second hole segment 132 on the wall surface of the casing body 11 opposite to the opening, and / or on the cover plate body 12. This creates a limiting step 133 within the welded through hole 13 that abuts against the sealing plate 21. By providing a sealing element 3 to seal the gap between the sealing plate 21 and the limiting step 133, a second seal is formed on the basis of sealing and sealing by welding the sealing plate 21 to the casing body 11 or the cover plate body 12. Even if there are pores in the weld after welding, external moisture will be blocked by the sealing element 3, thereby avoiding the problem of external moisture corroding the insulating plate 22. This provides high sealing performance and extends the service life of the product.

[0039] The battery casing can be adapted to different types of batteries, such as blade batteries or prismatic batteries. Furthermore, the battery casing can be configured into various blade battery or prismatic battery structures by varying the number of openings in the casing body 11 and the number of cover plates 12. Examples include: a blade battery with a double-sided open casing body 11 and double cover plates 12; a blade battery with a single-sided window casing body 11 and single cover plate 12; or a prismatic battery with a single-sided window casing body 11 and single cover plate 12. The welding through-hole 13 can be provided solely on the casing body 11, solely on the cover plate 12, or both on the cover plate 12 and the casing body 11. In this embodiment, the specific structure of the battery casing is a prismatic battery casing with a single-sided window casing body 11 and a single cover plate 12. The welding window is located on the casing body 11, while the cover plate 12 does not have a welding window and is only used to close the opening of the casing body 11.

[0040] Optionally, such as Figure 1 , Figure 2 As shown, the sealing plate 21 includes a sealing portion 211 and a plug-in portion 212. The sealing portion 211 is inserted into the first hole section 131 and abuts against the limiting step 133. The plug-in portion 212 is located on the side of the sealing portion 211 facing the limiting step 133 and is inserted into the second hole section 132. The insulating plate 22 is located on the side of the plug-in portion 212 away from the sealing portion 211. By providing a sealing portion inserted into the first hole section 131 and a plug-in portion 212 inserted into the second hole section 132 in the sealing plate 21, the contact area of ​​the sealing plate 21 is increased, thereby improving the sealing performance of the welded through hole 13. In this embodiment, the sealing portion 211 and the plug-in portion 212 of the sealing plate 21 can be manufactured by an integral molding process, or the sealing portion 211 and the plug-in portion 212 can be manufactured separately and then welded together.

[0041] Optionally, such as Figure 1 , Figure 2 As shown, the sealing member 3 includes a first sealing portion 31 and a through-hole penetrating the first sealing portion 31. The first sealing portion 31 is sandwiched between the closing portion 211 and the limiting step 133, and the insertion portion 212 passes through the first sealing portion 31 and is inserted into the second hole section 132. By forming the first sealing portion 31 on the sealing member 3 between the closing portion 211 and the limiting step 133, the gap between the closing portion 211 and the limiting step 133 is sealed by the first sealing portion 31, preventing external moisture from entering the gap between the closing portion 211 and the limiting step 133.

[0042] Furthermore, such as Figure 1 , Figure 2As shown, the sum of the thicknesses of the sealing portion 211 and the first sealing portion 31 along the first direction does not exceed the depth of the first hole segment 131 along the first direction. By ensuring that the sum of the thicknesses of the sealing portion 211 and the first sealing portion 31 along the first direction does not exceed the depth of the first hole segment 131 along the first direction, it is guaranteed that the surface of the sealing plate 21 facing away from the tab 100 will not exceed the welding through hole 13 after assembly, thus avoiding interference of the sealing plate 21 for subsequent connection operations.

[0043] Furthermore, such as Figure 1 , Figure 2 As shown, the sealing element 3 also includes a second sealing portion 32, which is continuously disposed around the circumferential edge of the insertion through hole. The second sealing portion 32 is inserted into the second hole segment 132 and covers the outer periphery of the insertion portion 212. By providing the second sealing portion 32 continuously disposed around the circumferential edge of the insertion through hole, the gap between the insertion portion 212 and the limiting step 133 is sealed by the second sealing portion 32. It cooperates with the first sealing portion 31 to achieve the sealing between the sealing portion and the limiting step 133, as well as the sealing between the insertion portion 212 and the limiting step 133, thereby expanding the sealing area of ​​the sealing element 3 and improving the sealing performance of the sealing element 3.

[0044] Optionally, such as Figure 1 , Figure 2 , Figure 4 As shown, the outer casing 11 has a mounting boss 14 on the wall opposite to the opening, and / or the cover plate 12. The mounting boss 14 protrudes in a direction away from the tab 100, and a stepped welding through hole 13 is formed on the mounting boss 14. By providing the mounting boss 14 on the wall opposite to the opening of the outer casing 11, and / or the cover plate 12, the installation height of the sealing plate 21 is increased, thereby avoiding affecting the tab 100 that has already been welded when welding the sealing plate 21, and ensuring the welding quality of the tab 100.

[0045] The mounting boss 14 can be set separately on the wall surface opposite to the opening of the outer casing 11, or it can be set separately on the cover plate body 12, or the mounting boss 14 can be set on both the wall surface opposite to the opening of the outer casing 11 and the cover plate body 12. The specific setting method can be freely adjusted according to the specific structure of the battery.

[0046] Optionally, the thermal conductivity of the seal 3 is lower than that of the insulating plate 22. By making the thermal conductivity of the seal 3 lower than that of the insulating plate 22, the seal 3 also has a higher heat-insulating function, preventing the high temperature generated during welding of the sealing plate 21 from melting the insulating plate 22, which would cause the insulating plate 22 to deform due to melting and reduce the insulation effect of the insulating plate 22 on the tab 100.

[0047] Optionally, such as Figure 3 As shown, the projection of the sealing element 3 onto the sealing plate 21 along the first direction is racetrack-shaped, rectangular, or circular. By making the projection of the sealing element 3 onto the sealing plate 21 along the first direction racetrack-shaped, rectangular, or circular, the sealing element 3 can be adapted to sealing plates 21 of different shapes. The shape of the sealing plate 21 is adapted to the shape of the welding through hole 13. In this embodiment, the welding through hole 13 opened on the wall surface opposite the opening of the outer shell body 11 and / or on the cover plate body 12 is a rectangular through hole. Therefore, the shape of the sealing plate 21 is also rectangular to adapt to it. In this case, to ensure the sealing performance of the sealing plate 21, the projection of the sealing element 3 onto the sealing plate 21 along the first direction is rectangular.

[0048] Optionally, the seal 3 is integrally molded using injection molding. By using injection molding to manufacture the seal 3, it is convenient to simultaneously form the first sealing part 31 and the second sealing part 32 of the seal 3. Furthermore, since the seal 3 is injection molded, it has a certain degree of elasticity, which allows for adjustment of the seal 3 during assembly.

[0049] In this embodiment, as Figure 3 As shown, a battery is also provided, comprising an electrode assembly 200 and the aforementioned battery casing, with the electrode assembly 200 disposed within the battery casing. By employing the aforementioned battery casing, this battery ensures the sealing of the welded through-hole 13 after the sealing plate 21 is welded, preventing corrosion of the insulating plate 22, extending the product's service life, and improving product quality.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery casing, characterized in that, The battery casing includes: A housing assembly, comprising an outer shell body and a cover plate body, the outer shell body having at least one opening, the cover plate body corresponding one-to-one with the opening of the outer shell body and used to close the opening of the outer shell body, the outer shell body having a wall surface opposite to the opening, and / or, the cover plate body having a welding through hole for welding electrode tabs, the welding through hole having a stepped structure including a first hole segment and a second hole segment, and forming a limiting step between the first hole segment and the second hole segment; A sealing assembly, comprising a sealing plate and an insulating plate, wherein the sealing plate is inserted into the first hole segment and abuts against the limiting step, the insulating plate is disposed on the side of the sealing plate facing the electrode tab and is inserted into the second hole segment, and the sealing plate is welded to the outer shell body and / or the cover plate body to seal the welding through hole; A sealing element for sealing the gap between the sealing plate and the limiting step.

2. The battery casing according to claim 1, characterized in that, The sealing plate includes a sealing part and a plug-in part. The sealing part is inserted into the first hole and abuts against the limiting step. The plug-in part is located on the side of the sealing part facing the limiting step and is inserted into the second hole. The insulating plate is located on the side of the plug-in part away from the sealing part.

3. The battery casing according to claim 2, characterized in that, The sealing element includes a first sealing portion and a through-hole that penetrates the first sealing portion. The first sealing portion is sandwiched between the closing portion and the limiting step, and the through-hole portion passes through the first sealing portion and is inserted into the second hole segment.

4. The battery casing according to claim 3, characterized in that, The thickness of the closure portion and the first sealing portion along the first direction does not exceed the depth of the first hole segment along the first direction.

5. The battery casing according to claim 4, characterized in that, The sealing element further includes a second sealing portion, which is continuously disposed around the circumferential edge of the insertion through hole. The second sealing portion is inserted into the second hole segment and covers the outer periphery of the insertion portion.

6. The battery casing according to claim 1, characterized in that, The outer casing body and the wall opposite the opening, and / or the cover plate body are provided with mounting bosses, the mounting bosses protrude in a direction away from the electrode tabs, and the stepped welding through holes are opened on the mounting bosses.

7. The battery casing according to claim 1, characterized in that, The thermal conductivity of the seal is lower than that of the insulating plate.

8. The battery casing according to claim 1, characterized in that, The projection of the seal on the sealing plate along the first direction is racetrack-shaped, rectangular, or circular.

9. The battery casing according to claim 1, characterized in that, The sealing element is integrally molded using an injection molding process.

10. A battery, characterized in that, The battery includes an electrode assembly and a battery casing as described in any one of claims 1-9, wherein the electrode assembly is disposed within the battery casing.

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