Shell assembly and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a shell assembly and a battery, the shell assembly is connected with a pole group, the shell assembly comprises a shell body, an anti-explosion valve and a protective patch, the shell body is sequentially provided with a first step groove, a through hole and a second step groove in the thickness direction of the shell body, the first step groove is formed in the side, away from the pole group, of the through hole, and the second step groove is formed in the side, away from the pole group, of the through hole; the second step groove is formed in one side, facing the pole group, of the through hole; the explosion-proof valve comprises a base table and a welding step, the base table is arranged in the second step groove, the welding step is arranged in the through hole to limit the relative position of the explosion-proof valve on the shell body, and the welding step is connected with the shell body; the protection patch is arranged in the first step groove. In this way, the base table is connected with the second step groove in a clamped mode, the welding step is connected with the through hole, the position of the anti-explosion valve can be limited, the protective patch can protect the surface, facing the outside, of the anti-explosion valve, and impact of the anti-explosion valve and external objects and electrolyte corrosion are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a shell assembly and a battery. Background Art

[0002] Lithium-ion batteries, as high-efficiency, high-energy-density energy storage devices, are widely used in electric vehicles, energy storage systems and other fields.

[0003] Existing long-cell lithium-ion batteries include a shell, a cover plate and an electrode group. The electrode group is arranged in a containing space formed by the shell and the cover plate. In order to ensure the safe operation of the long-cell lithium-ion battery, an explosion-proof valve is provided at the bottom of the shell to facilitate timely discharge of gas in the battery and realize thermal and electrical separation to avoid gas accumulation in the shell.

[0004] However, in various production processes, the shell may collide or rub against other external equipment, which may cause the explosion-proof valve at the bottom of the shell to be scratched and bumped. When the electrolyte is injected into the shell, the electrolyte may also contact the outer surface of the explosion-proof valve and corrode the explosion-proof valve, affecting the sealing of the explosion-proof valve. In the design of the whole vehicle, the explosion-proof valve is usually set towards the bottom of the chassis. When the chassis is hit by a ball, scraped by the bottom, etc., the explosion-proof valve may be damaged, resulting in adverse effects such as leakage. There is a problem that the explosion-proof valve is easily affected by external impacts and electrolyte corrosion, affecting the safety and reliability of the battery. Summary of the invention

[0005] The object of the present invention is to provide a shell assembly and a battery to solve the problem that the explosion-proof valve is easily affected by external impact and electrolyte corrosion.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a shell component is connected to a pole group, the shell component comprising: a shell body, the shell body being provided with a first step groove, a through hole and a second step groove in sequence along its thickness direction, the first step groove being arranged on a side of the through hole away from the pole group, the second step groove being arranged on a side of the through hole facing the pole group; an explosion-proof valve, the explosion-proof valve comprising a base and a welding step, the base being arranged in the second step groove, the welding step being arranged in the through hole to limit the relative position of the explosion-proof valve on the shell body, the welding step being connected to the shell body; a protective patch, the protective patch being arranged in the first step groove.

[0008] Preferably, the explosion-proof valve is arranged on the bottom surface of the shell body, the thickness of the bottom surface of the shell body is H1, and satisfies 0.50mm≤H1≤1.20mm.

[0009] Preferably, the height of the through hole is H3, the height of the welding step is H6, and H3 = H6 is satisfied.

[0010] Preferably, the height of the protective patch is H5, and 0.10 mm ≤ H5 ≤ 0.20 mm is satisfied.

[0011] Preferably, the height of the first step groove is H2, and H2 ≥ H5 is satisfied; and / or, the height of the second step groove is H4, the height of the base is H7, and H4 ≥ H7 is satisfied.

[0012] Preferably, the height of the explosion-proof valve is H8, and 0.35 mm ≤ H8 ≤ 1.00 mm is satisfied.

[0013] Preferably, the surface of the first step groove facing away from the electrode group is flush with the surface of the housing body facing away from the electrode group; and / or, the surface of the second step groove facing the electrode group is flush with the surface of the housing body facing the electrode group.

[0014] Preferably, the welding step is welded to the housing body, and the weld formed by welding is arranged around the connection between the welding step and the bottom surface of the first step groove.

[0015] Preferably, the penetration depth of the weld is greater than or equal to 0.30 mm; and / or, the penetration depth of the weld is less than or equal to the height of the explosion-proof valve.

[0016] In a second aspect, a battery includes an electrode group, a cover plate, and the housing assembly as described above. The electrode group is disposed inside the housing body, and the cover plate is connected to the housing body.

[0017] Advantages of the present invention:

[0018] A housing assembly is connected to an electrode group. The housing assembly includes a housing body, an explosion-proof valve, and a protective patch. The housing body is sequentially provided with a first step groove, a through hole, and a second step groove along its thickness direction. The first step groove is disposed on a side of the through hole away from the electrode group, and the second step groove is disposed on a side of the through hole facing the electrode group. The explosion-proof valve includes a base and a welding step. The base is disposed in the second step groove, and the welding step is disposed in the through hole to limit the relative position of the explosion-proof valve on the housing body. The welding step is connected to the housing body. The protective patch is disposed in the first step groove.

[0019] Thus, after the explosion-proof valve is assembled to the housing body, the through-hole and the second stepped groove can limit the position of the explosion-proof valve, enabling the explosion-proof valve to be stably connected to the housing body, preventing the explosion-proof valve from shifting or falling off during subsequent welding, the protective patch can protect the surface of the explosion-proof valve facing the outside, enhance the sealing performance of the housing body, avoid risks such as scraping, bumping, and ball impact of the explosion-proof valve, prevent the electrolyte from contacting the explosion-proof valve and causing corrosion to the explosion-proof valve, and improve the reliability and safety of the battery. Description of the Drawings

[0020] Figure 1 is the first partial side sectional view of the housing assembly in an embodiment of the present invention;

[0021] Figure 2 is in an embodiment of the present invention Figure 1 Enlarged view of part A;

[0022] Figure 3 is the side sectional view of the explosion-proof valve in an embodiment of the present invention;

[0023] Figure 4 is the partial side sectional view of the housing body in an embodiment of the present invention;

[0024] Figure 5 is the second partial side sectional view of the housing assembly in an embodiment of the present invention;

[0025] Figure 6 is the third partial side sectional view of the housing assembly in an embodiment of the present invention;

[0026] Figure 7 is the fourth partial side sectional view of the housing assembly in an embodiment of the present invention;

[0027] Figure 8 is the fifth partial side sectional view of the housing assembly in an embodiment of the present invention;

[0028] Figure 9 is the first structural schematic diagram of the housing body in an embodiment of the present invention;

[0029] Figure 10 is the first partial structural schematic diagram of the housing assembly in an embodiment of the present invention;

[0030] Figure 11 is the first structural schematic diagram of the housing assembly in an embodiment of the present invention;

[0031] Figure 12 is the second structural schematic diagram of the housing body in an embodiment of the present invention;

[0032] Figure 13 is the second partial structural schematic diagram of the housing assembly in an embodiment of the present invention;

[0033] Figure 14 This is the second schematic structural view of the housing assembly in an embodiment of the present invention.

[0034] In the figure:

[0035] 1. Housing body; 11. First stepped groove; 12. Through hole; 13. Second stepped groove; 2. Explosion-proof valve; 21. Base; 211. Valve-opening area; 22. Welding step; 3. Protection patch. Specific embodiments

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0040] Refer to Figures 1 to 3The present invention provides a shell component connected to a pole group (not shown in the figure), the shell component includes a shell body 1, an explosion-proof valve 2 and a protective patch 3, the shell body 1 is provided with a first step groove 11, a through hole 12 and a second step groove 13 in sequence along its thickness direction, the first step groove 11 is arranged on the side of the through hole 12 away from the pole group, and the second step groove 13 is arranged on the side of the through hole 12 facing the pole group; the explosion-proof valve 2 includes a base 21 and a welding step 22, the base 21 is arranged in the second step groove 13, and the welding step 22 is arranged in the through hole 12 to limit the relative position of the explosion-proof valve 2 on the shell body 1, and the welding step 22 is connected to the shell body 1; the protective patch 3 is arranged in the first step groove 11.

[0041] In this embodiment, both ends of the through hole 12 are connected to the first step groove 11 and the second step groove 13 respectively, and the cross-sectional area of ​​the first step groove 11 and the cross-sectional area of ​​the second step groove 13 are both larger than the cross-sectional area of ​​the through hole 12. A valve opening area 211 is provided on the base 21. When the explosion-proof valve 2 is provided on the shell body 1, the valve opening area 211 is located inside the second step groove 13.

[0042] Furthermore, the thickness of the wall of the shell body 1 on which the explosion-proof valve 2 is arranged is greater than the thickness of other walls, so as to have enough space for assembling the explosion-proof valve 2 and the protective patch 3 .

[0043] In this way, when the explosion-proof valve 2 is assembled on the shell body 1, the base 21 abuts against the second step groove 13, and the outer wall of the welding step 22 abuts against the inner wall of the through hole 12, which can achieve the preliminary positioning of the explosion-proof valve 2 and prevent the explosion-proof valve 2 from being offset or falling off during the subsequent welding process. By providing the first step groove 11, the through hole 12, and the second step groove 13, the wall thickness of the shell body 1 can be fully utilized, so that both ends of the explosion-proof valve 2 do not protrude from the shell body 1, and the protection patch 3 can protect the surface of the explosion-proof valve 2 facing the outside, further reducing the risks of scratches, bumps, and ball hits between the explosion-proof valve 2 and external objects, and preventing the electrolyte from corroding the surface of the explosion-proof valve 2 facing the outside, thereby improving the safety of the explosion-proof valve 2, preventing the explosion-proof valve 2 from being damaged and ruptured and causing leakage of liquid and gas, and improving the connection strength and sealing performance of the explosion-proof valve 2 and the shell body 1, thereby improving the safety and reliability of the battery.

[0044] It can be understood that the setting position of the valve opening area 211 can be adjusted according to actual needs. In this embodiment, the valve opening area 211 is set in the middle of the explosion-proof valve 2, and the valve opening area 211 is protruded toward the outside, and the surface of the valve opening area 211 facing the outside is concave in the welding step 22.

[0045] See also Figure 3 and Figure 4, in some embodiments, the explosion-proof valve 2 is disposed on the bottom surface of the housing body 1. The thickness of the bottom surface of the housing body 1 is H1, and 0.50 mm ≤ H1 ≤ 1.20 mm is satisfied.

[0046] In this embodiment, the thickness H1 of the bottom surface of the housing body 1 can be any value between 0.50 mm and 1.20 mm or the range between any two values, such as 0.50 mm, 0.70 mm, 0.90 mm, 1.00 mm, 1.20 mm, etc.

[0047] In this way, the bottom surface of the housing body 1 can have a sufficient wall thickness to form the first stepped groove 11, the through hole 12, and the second stepped groove 13, improving the structural strength of the bottom surface of the housing body 1, ensuring that the bottom surface of the housing body 1 has sufficient strength to resist external impacts, enabling the bottom surface of the housing body 1 to stably support the explosion-proof valve 2, avoiding the explosion-proof valve 2 from cracking due to the deformation of the housing body 1, and the explosion-proof valve 2 is limited by the second stepped groove 13 and the through hole 12, enabling the bottom surface of the housing body 1 to protect the side wall of the explosion-proof valve 2, avoiding stress concentration at the connection between the housing body 1 and the explosion-proof valve 2. The first stepped groove 11 can limit the position of the protection patch 3 and make full use of the wall thickness space, making the protection patch 3 flush with the bottom surface of the housing body 1, improving the flatness of the housing body 1, and further improving the safety and reliability of the battery.

[0048] It can be understood that the thickness H1 of the bottom surface of the housing body 1 cannot be too large, as this will cause an increase in the overall weight of the housing body 1 and affect the overall design of the battery. Nor can it be too small, as this will result in poor structural strength of the housing body 1, making it difficult to provide sufficient protection for the explosion-proof valve 2 and not having enough space to form the first stepped groove 11, the through hole 12, and the second stepped groove 13. The thickness H1 of the bottom surface of the housing body 1 can be adjusted according to actual needs and will not be listed in detail here.

[0049] Refer to Figure 3 and Figure 4 , in some embodiments, the height of the through hole 12 is H3, and the height of the welding step 22 is H6, and H3 = H6 is satisfied. That is, when the base 21 is clamped with the second stepped groove 13, the surface of the welding step 22 facing away from the electrode group is flush with the bottom surface of the first stepped groove 11.

[0050] In this embodiment, the welding step 22 and the bottom surface of the housing body 1 are hermetically fixedly connected by seam welding, and the weld seam is located on the side of the welding step 22 facing away from the electrode group. When the protection patch 3 is located in the first stepped groove 11, the surface of the protection patch 3 facing the electrode group of the battery cell abuts against both the bottom surface of the first stepped groove 11 and the surface of the welding step 22 facing away from the electrode group.

[0051] In this way, it is convenient to weld the welding step 22 to the bottom surface of the housing body 1, and a uniform and continuous weld seam can be formed, enhancing the sealing performance and structural strength at the weld seam, avoiding welding defects, protecting the patch 3 to be able to cover the weld seam position and protecting the connection between the welding step 22 and the bottom surface of the housing body 1, preventing external objects from rubbing, hitting, or bumping against the welding step 22, and blocking the electrolyte from contacting the explosion-proof valve 2, avoiding the electrolyte from corroding the surface of the explosion-proof valve 2 facing the outside, and improving the safety and reliability of the battery.

[0052] It can be understood that the height H3 of the through hole 12 cannot be greater than the height H6 of the welding step 22, nor can it be less than the height H6 of the welding step 22, otherwise the welding step 22 will protrude or be concave relative to the through hole 12, affecting the butt joint welding effect and reducing the yield rate.

[0053] Refer to Figure 5 , in some embodiments, the height of the protection patch 3 is H5, and 0.10 mm ≤ H5 ≤ 0.20 mm is satisfied.

[0054] In this embodiment, the height H5 of the protection patch 3 can be any value between 0.10 mm and 0.20 mm or the range between any two values, such as 0.10 mm, 0.15 mm, 0.20 mm, etc.

[0055] In this way, the protection patch 3 can reduce the occupation of the wall thickness space of the housing body 1 while having a certain structural strength, so that the explosion-proof valve 2 is located on the side of the protection patch 3 facing the electrode group. The explosion-proof valve 2 is fixed on the housing body 1 by welding. The protection patch 3 can further limit the position of the explosion-proof valve 2, enhance the connection strength between the explosion-proof valve 2 and the housing body 1, avoid scratches or cracks on the explosion-proof valve 2 after being impacted by the outside, and can block the electrolyte from contacting the explosion-proof valve 2, extending the service life of the explosion-proof valve 2.

[0056] It can be understood that the height H5 of the protection patch 3 cannot be too large, as it will cause the protection patch 3 to protrude from the first step groove 11, thereby increasing the risk of the protection patch 3 being rubbed by the outside, and then causing the protection patch 3 to warp or even fall off, losing its protection function. The height H5 of the protection patch 3 cannot be too small either, as it will result in a relatively small structural strength of the protection patch 3, making it difficult to protect the explosion-proof valve 2. The height H5 of the protection patch 3 can be adjusted according to actual needs and will not be listed in detail here.

[0057] Refer to Figure 4 and Figure 5, in some embodiments, the height of the first stepped groove 11 is H2, and H2≥H5 is satisfied. The height of the second stepped groove 13 is H4, and the height of the base 21 is H7, and H4≥H7 is satisfied. That is, the surface of the protective patch 3 facing away from the electrode group is flush with the surface of the first stepped groove 11 facing away from the electrode group, or the protective patch 3 is recessed in the first stepped groove 11. The surface of the base 21 facing the electrode group is flush with the surface of the second stepped groove 13 facing the electrode group, or the surface of the base 21 facing the electrode group is recessed in the second stepped groove 13.

[0058] In this way, the first stepped groove 11 and the second stepped groove 13 can respectively provide protection and limit for the protective patch 3 and the base 21, so that the protective patch 3 has better damage resistance when subjected to external impact or electrolyte corrosion, and provides protection for the explosion-proof valve 2, reducing the external impact and electrolyte corrosion received by the explosion-proof valve 2, and enabling the base 21 to be protected by the housing body 1, avoiding the base 21 protruding from the surface of the housing body 1 facing the electrode group and causing interference with other structures inside the housing body 1, and improving the safety and reliability of the battery.

[0059] It can be understood that the height H2 of the first stepped groove 11, the height H4 of the second stepped groove 13, and the height H7 of the base 21 can all be adjusted according to actual needs, and will not be elaborated here.

[0060] Refer to Figure 3 , in some embodiments, the height of the explosion-proof valve 2 is H8, and 0.35mm≤H8≤1.00mm is satisfied. Further, H8 = H6 + H7 is satisfied.

[0061] In this embodiment, the height H8 of the explosion-proof valve 2 can be any value between 0.35mm and 1.00mm or the range between any two values, such as 0.35mm, 0.50mm, 0.70mm, 0.90mm, 1.00mm, etc.

[0062] In this way, the height of the explosion-proof valve 2 is less than the thickness of the bottom surface of the housing body 1, which can make full use of the wall thickness of the bottom surface of the housing body 1 to assemble the explosion-proof valve 2 and the protective patch 3, keep the bottom surface of the housing body 1 flat after assembling the explosion-proof valve 2 and the protective patch 3, make reasonable use of the space of the bottom surface of the housing body 1, and provide sufficient protection for the explosion-proof valve 2 to avoid external impacts such as ball strikes, scratches, and knocks, as well as electrolyte corrosion.

[0063] It can be understood that the height H8 of the explosion-proof valve 2 cannot be too large, otherwise the explosion-proof valve 2 will protrude from the bottom surface of the housing body 1 or there will not be enough space on the bottom surface of the housing body 1 to assemble the protective patch 3. The height H8 of the explosion-proof valve 2 cannot be too small either, otherwise the structural strength of the explosion-proof valve 2 will be insufficient, affecting the performance of the explosion-proof valve 2.

[0064] To verify the rationality of the ranges of the thickness H1 of the bottom surface of the housing body 1, the height H2 of the first step groove 11, the height H3 of the through hole 12, the height H4 of the second step groove 13, the height H5 of the protection patch 3, the height H6 of the welding step 22, and the height H7 of the base 21, as shown in Table 1, this embodiment provides nine sets of examples and eight sets of comparative examples for illustration.

[0065] Table 1

[0066]

[0067] As can be seen from Examples 1 to 9 in the table, after meeting the range limitations, neither the protection patch 3 nor the base 21 protrudes from the bottom surface of the housing body 1, which can stably connect the housing body 1 and the explosion-proof valve 2, and enable the protection patch 3 to protect the explosion-proof valve 2 from external impacts and electrolyte corrosion, improving the reliability and safety of the battery.

[0068] As can be seen from Comparative Examples 1 and 2 in the table, when the height H5 of the protection patch 3 is greater than the height H2 of the first step groove 11, the protection patch 3 protrudes from the surface of the housing body 1 facing away from the electrode group, increasing the risk of interference with other items and scraping and falling off during the production process of the battery cell.

[0069] As can be seen from Comparative Examples 3 and 4 in the table, when the height H7 of the base 21 is greater than the height H4 of the second step groove 13, the base 21 protrudes from the surface of the housing body 1 facing the electrode group, which will not only interfere with other structures inside the housing body 1, but also pose a scraping risk when the electrode group of the battery cell is inserted into the housing, damaging the electrode group and reducing the reliability and safety of the battery.

[0070] As can be seen from Comparative Examples 5 to 8 in the table, whether the welding step 22 is higher or lower than the through hole 12 of the housing body 1 will affect the welding effect, reduce the welding yield, affect the sealing performance and stability at the connection between the explosion-proof valve 2 and the housing body 1, and increase the risk of liquid leakage and gas leakage.

[0071] Refer to Figure 4 and Figure 6 , in some embodiments, the surface of the first step groove 11 facing away from the electrode group is flush with the surface of the housing body 1 facing away from the electrode group, and the surface of the second step groove 13 facing the electrode group is flush with the surface of the housing body 1 facing the electrode group. That is, the sum of the height H2 of the first step groove 11, the height H3 of the through hole 12, and the height H4 of the second step groove 13 is equal to the thickness H1 of the bottom surface of the housing body 1.

[0072] In this embodiment, the cross-sectional area of the first step groove 11 is larger than the cross-sectional area of the second step groove 13, so that in the thickness direction of the housing body 1, the projection of the protection patch 3 can cover the projection of the explosion-proof valve 2.

[0073] In this way, the housing body 1 equipped with the explosion-proof valve 2 and the protective patch 3 can be made flatter and have a more uniform thickness, improving the bearing capacity and anti-deformation ability of the bottom surface of the housing body 1. Furthermore, the housing body 1 can withstand external impacts and vibrations, reducing the influence of external impacts on the explosion-proof valve 2. Also, it can improve the sealing performance at the connection between the explosion-proof valve 2 and the housing body 1, preventing electrolyte from seeping into the gap between the explosion-proof valve 2 and the housing body 1, reducing problems such as liquid leakage and gas leakage caused by poor sealing, extending the service life of the battery. The projection of the protective patch 3 covers the projection of the explosion-proof valve 2 in the thickness direction of the housing body 1, enabling the protective patch 3 to provide stable protection for the explosion-proof valve 2, blocking the contact between the electrolyte and the explosion-proof valve 2, and reasonably utilizing the surface space of the housing body 1 away from the electrode group to improve the protection effect.

[0074] Refer to Figure 6 , in some embodiments, the welding step 22 is welded to the housing body 1, and the weld formed by welding is arranged around the connection between the welding step 22 and the bottom surface of the first step groove 11.

[0075] In this embodiment, the welding area is located on the surface of the welding step 22 away from the electrode group. After welding the welding step 22 to the bottom surface of the housing body 1, the weld is on the side of the housing body 1 facing the outside, avoiding interference with the inside of the housing body 1.

[0076] In this way, arranging the weld around the connection between the welding step 22 and the bottom surface of the first step groove 11 can improve the sealing performance and stability at the connection between the explosion-proof valve 2 and the housing body 1, preventing electrolyte and external impurities from entering the inside of the housing body 1, and can fully utilize the space on the surface of the bottom of the housing body 1 away from the electrode group, avoiding the influence of welding on the internal space of the housing body 1, facilitating the realization of a higher-strength welded connection, enhancing the connection strength between the explosion-proof valve 2 and the housing body 1, reducing the assembly difficulty, and avoiding risks such as cracking and falling off of the explosion-proof valve 2 when it is subjected to external impacts.

[0077] It can be understood that the connection method between the explosion-proof valve 2 and the housing body 1 can be adjusted according to actual design needs, and will not be listed in detail here.

[0078] Refer to Figure 6 , in some embodiments, the penetration depth of the weld is greater than or equal to 0.30 mm, and the penetration depth of the weld is less than or equal to the height H8 of the explosion-proof valve 2.

[0079] In this embodiment, the penetration depth of the weld can be 0.30 mm, 0.40 mm, 0.50 mm, etc.

[0080] In this way, it is possible to make the welding area have enough solder to achieve a sealed connection between the explosion-proof valve 2 and the housing body 1, avoid the electrolyte from corroding the explosion-proof valve 2 and the housing body 1 through the gap between the explosion-proof valve 2 and the housing body 1, and be able to avoid the weld bead protruding from the surface of the bottom of the housing body 1 away from the electrode group, keep the bottom surface of the housing body 1 flat, improve the space utilization rate of the bottom surface of the housing body 1, and effectively utilize the wall thickness of the bottom surface of the housing body 1.

[0081] It can be understood that the penetration depth of the weld cannot be too large, otherwise it will interfere with other structures and affect the assembly of the battery. Nor can it be too small, otherwise it will lead to insufficient welding strength and affect the connection strength and sealing performance at the connection between the explosion-proof valve 2 and the bottom surface of the housing body 1. The penetration depth of the weld can be adjusted according to actual needs and will not be listed in detail here.

[0082] Refer to Figure 7 and Figure 8 , the present invention also provides a battery, including an electrode group, a cover plate (not shown in the figure) and a housing assembly. The electrode group is arranged inside the housing body 1, and the cover plate is connected to the housing body 1.

[0083] In this embodiment, refer to Figures 9 - 11 , the battery adopts an ejector pole design. The cover plate is arranged on the top surface of the housing body 1, and the electrode group is arranged in the accommodating area formed by the housing body 1 and the cover plate.

[0084] It can be understood that, refer to Figures 12 - 14 , the battery can also adopt a two-side ejector pole design. There are two cover plates. The two cover plates are respectively arranged on both sides of the housing body 1, and poles are respectively arranged on the two cover plates. The specific structure of the battery can be adjusted according to actual needs, and it is only necessary to be able to arrange the explosion-proof valve 2 and the protection patch 3 at the bottom of the housing body 1, which will not be elaborated here.

[0085] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A housing assembly, characterized in that, Connected to the electrode group, the housing assembly includes: A housing body (1), in which a first stepped groove (11), a through hole (12), and a second stepped groove (13) are sequentially formed along the thickness direction thereof. The first stepped groove (11) is disposed on a side of the through hole (12) facing away from the electrode group, and the second stepped groove (13) is disposed on a side of the through hole (12) facing the electrode group; An explosion-proof valve (2), which includes a base (21) and a welding step (22). The base (21) is disposed in the second stepped groove (13), and the welding step (22) is disposed in the through hole (12) to limit the relative position of the explosion-proof valve (2) on the housing body (1), and the welding step (22) is connected to the housing body (1); A protection patch (3), which is disposed in the first stepped groove (11).

2. The housing assembly according to claim 1, wherein The explosion-proof valve (2) is disposed on the bottom surface of the housing body (1). The thickness of the bottom surface of the housing body (1) is H1, and 0.50 mm ≤ H1 ≤ 1.20 mm is satisfied.

3. The housing assembly according to claim 1, wherein The height of the through hole (12) is H3, and the height of the welding step (22) is H6, and H3 = H6 is satisfied.

4. The housing assembly according to claim 1, wherein, The height of the protection patch (3) is H5, and 0.10 mm ≤ H5 ≤ 0.20 mm is satisfied.

5. The housing assembly according to claim 4, characterized in that, The height of the first stepped groove (11) is H2, and H2 ≥ H5 is satisfied; and / or, the height of the second stepped groove (13) is H4, and the height of the base (21) is H7, and H4 ≥ H7 is satisfied.

6. The housing assembly according to claim 1, characterized in that, The height of the explosion-proof valve (2) is H8, and 0.35 mm ≤ H8 ≤ 1.00 mm is satisfied.

7. The housing assembly according to any one of claims 1-6, characterized in that, The surface of the first stepped groove (11) facing away from the electrode group is flush with the surface of the housing body (1) facing away from the electrode group; and / or, the surface of the second stepped groove (13) facing the electrode group is flush with the surface of the housing body (1) facing the electrode group.

8. The housing assembly according to any one of claims 1-6, characterized in that, The welding step (22) is welded to the housing body (1), and the formed weld seam is disposed around the connection between the welding step (22) and the bottom surface of the first stepped groove (11).

9. The housing assembly according to claim 8, characterized in that, The penetration depth of the weld seam is greater than or equal to 0.30 mm; and / or, the penetration depth of the weld seam is less than or equal to the height of the explosion-proof valve (2).

10. A battery, characterized in that, Including an electrode group, a cover plate, and the housing assembly according to any one of claims 1-9, wherein the electrode group is disposed inside the housing body (1), and the cover plate is connected to the housing body (1).

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