Battery shell, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery shell, a battery and an electric device, the battery shell comprises a shell body, one end of the shell body is provided with a first opening, the edge of the first opening is provided with a bending part, and the bending part is bent towards the center direction of the first opening so as to be used for being connected with a tab of a battery cell; through the arrangement of the shell body, the edge of the first opening of the shell body is provided with the bent part, the bent part can be bent towards the center direction of the first opening, and the bent bent part is used for being connected with a tab of a battery cell, so that the bent part can be used as a current collecting plate, and the current collecting plate with a flanging structure does not need to be additionally used; therefore, the space utilization rate of the battery shell in the height direction is improved, and the energy density of the battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery casing, a battery and an electrical device. Background Art

[0002] As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. They have broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] Currently, the tabs of battery cells are connected to the battery terminals via collector plates. These collector plates are typically bent to accommodate assembly. However, after being welded to the cover or terminal and folded, the space required for the bend reduces the actual usable space within the battery cell.

[0004] To address the space occupied by the bent collector plate, the prior art welds the collector plate to the sidewall of the housing. However, the flange structure on the collector plate used for welding to the sidewall of the housing takes up space in the height direction of the battery cell, thereby reducing the energy density of the battery. Utility Model Content

[0005] The purpose of the present utility model is to address the deficiencies of the prior art and provide a battery housing, a battery and an electrical device, thereby solving the technical problem in the prior art that the flange structure on the collecting plate for welding to the side wall of the housing occupies the space of the battery cell in the height direction.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a battery case, comprising a shell body, wherein one end of the shell body has a first opening, an edge of the first opening has a bending portion, and the bending portion is bent toward the center of the first opening for connection with a tab of a battery cell.

[0008] Preferably, a plurality of the bending portions are provided, and the plurality of the bending portions are spaced apart along the periphery of the first opening, and after the bending portions are bent, a gap is formed between two adjacent bending portions.

[0009] Preferably, two adjacent bent portions form a weld in the gap, and a width C of the weld is greater than a width W of the gap.

[0010] Preferably, the width C of the weld and the width W of the gap satisfy the relationship: W<C<2mm, wherein 0<W≤1mm.

[0011] Preferably, the gap has a starting end and an ending end, the starting end is arranged close to the center of the first opening, the ending end is arranged close to the side wall of the shell body, and there is a distance between the ending end and the side wall of the shell body.

[0012] Preferably, the spacing is 0.5 to 1.5 mm.

[0013] Preferably, along the height direction of the battery, the orthographic projection area S of each of the bent portions satisfies the relationship: Wherein, D is the diameter of the first opening.

[0014] Preferably, each of the bent portions has a groove at one end close to the center of the first opening, and the grooves of the plurality of bent portions together form an escape area, and the escape area corresponds to the position of the central hole of the battery cell.

[0015] Preferably, the radius R1 of the avoidance area and the radius R2 of the central hole of the battery cell satisfy the relationship: R2≤R1≤4R2.

[0016] Preferably, the device further comprises a first cover plate, which is arranged at the first opening, and a lower surface of the first cover plate abuts against the bent portion.

[0017] Preferably, the bending portion is provided on the inner wall of the shell body, the outer edge of the shell body has a supporting portion, and the first cover plate is provided on the supporting portion.

[0018] Preferably, along the thickness direction of the shell body, one end of the shell body includes a first part and a second part, the first part is bent toward the center direction of the first opening to form the bending part, and the second part extends along the height direction of the shell body to form the supporting part.

[0019] Preferably, after the bending portion is bent, a distance X between the bending portion and the top surface of the support portion satisfies the relationship: 0≤X≤1mm.

[0020] Preferably, the other end of the shell body has a second opening, and the second opening is covered with a second cover plate;

[0021] Alternatively, the other end of the shell body is a closed end.

[0022] In a second aspect, the present invention provides a battery, comprising a battery cell and the battery casing of the above embodiment, wherein the battery cell is accommodated in the battery casing, and the bent portion is connected to the tab of the battery cell.

[0023] In a third aspect, the present invention provides an electrical device comprising the battery of the above embodiment.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0025] The battery shell of the embodiment of the utility model has a bent portion at the edge of the first opening of the shell body through the arrangement of the shell body, and the bent portion can be bent toward the center direction of the first opening. The bent portion is used to connect with the pole ear of the battery cell, so that the bent portion can serve as a collecting plate, thereby eliminating the need for an additional collecting plate with a flange structure, thereby improving the space utilization in the height direction of the battery shell and improving the energy density of the battery.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 This is a schematic structural diagram of the battery of the present utility model.

[0029] Figure 2 This is one of the exploded views of the battery of the present utility model.

[0030] Figure 3 This is the second exploded view of the battery of the present utility model.

[0031] Figure 4 It is a schematic diagram of the cross-sectional structure of the battery of the present utility model.

[0032] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0033] Figure 6 for Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0034] Figure 7 This is one of the structural schematic diagrams of the battery housing of the present utility model.

[0035] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at G in the middle.

[0036] Figure 9 This is the second structural diagram of the battery housing of the present utility model.

[0037] Figure 10 for Figure 9 Schematic diagram of the enlarged structure at H in the middle.

[0038] Figure 11 This is the third structural diagram of the battery housing of the present utility model.

[0039] Figure 12 This is the fourth structural diagram of the battery housing of the present invention.

[0040] Figure 13 This is the fifth structural diagram of the battery housing of the present utility model.

[0041] The description of the accompanying drawings is as follows:

[0042] 100. Battery;

[0043] 10. Battery case; 11. Shell body; 12. Bend; 121. Gap; 1211. Starting end; 1212. End; 1213. Spacing; 122. Groove; 13. Support; 14. Avoidance area; 15. First cover; 151. Liquid injection hole; 152. Seal; 16. Second cover; 17. Closed end; 18. Post;

[0044] 20. Battery cell; 21. Center hole; 22. Tab. DETAILED DESCRIPTION

[0045] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0046] Furthermore, the terms “first,” “second,” etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0047] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0048] The following will be combined with the Figures 1 to 13 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0049] The power-consuming device of the embodiment of the present invention includes a battery 100. The power-consuming device may be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The car may be a fuel car, a gas car, or a new energy car, and the new energy car may be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes airplanes, rockets, space shuttles, and spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiment of the present application does not impose any special restrictions on the above-mentioned power-consuming devices.

[0050] See Figures 1 to 13 The battery 100 of the embodiment of the present invention includes a battery cell 20 and a battery housing 10 . The battery cell 20 is accommodated in the battery housing 10 , and the bending portion 12 is connected to the tab 22 of the battery cell 20 .

[0051] See Figures 1 to 13 The battery case 10 of an embodiment of the present invention includes a shell body 11, one end of the shell body 11 has a first opening, the edge of the first opening has a bending portion 12, and the bending portion 12 is bent toward the center direction of the first opening for connection with the tab 22 of the battery cell 20.

[0052] Compared with the prior art, the battery case 10 of the embodiment of the present invention, through the arrangement of the shell body 11, the edge of the first opening of the shell body 11 has a bending portion 12, and the bending portion 12 can be bent toward the center direction of the first opening. The bent bending portion 12 is used to connect with the pole ear 22 of the battery cell 20, so that the bending portion 12 can act as a collecting plate, thereby eliminating the need for an additional collecting plate with a flanging structure, thereby improving the space utilization in the height direction of the battery case 10 and improving the energy density of the battery 100.

[0053] The inventors discovered that if the bent portion 12 is disposed along the periphery of the first opening, bending the bent portion 12 toward the center of the first opening is equivalent to bending a portion of the shell wall 11 toward the center of the first opening. However, this direct bending method can easily cause wrinkles in the bent portion 12 after being squeezed. These wrinkles not only reduce the appearance of the shell, but more importantly, they may cause poor contact between the bent portion 12 and the tab 22 of the battery cell 20, thereby affecting the conductivity and safety performance of the battery 100.

[0054] Therefore, see Figures 7-13 In some embodiments, a plurality of the bending portions 12 are provided, and the plurality of the bending portions 12 are spaced apart along the periphery of the first opening, and after the bending portions 12 are bent, a gap 121 is formed between two adjacent bending portions 12. By providing a plurality of bending portions 12, the plurality of bending portions 12 can maintain their respective flexibility when bending, and after the bending is completed, a gap 121 is formed between two adjacent bending portions 12. Such a design effectively avoids the wrinkle problem that may occur during the bending process, thereby significantly improving the flatness of the bending portion 12. This not only ensures the connection effect between the bending portion 12 and the tab 22 of the battery cell 20, but also further enhances the conductive performance and overall safety performance of the battery 100.

[0055] It is understood that the connection between the bent portion 12 and the tab 22 of the battery cell 20 can be welding or connected via a conductive adhesive. Preferably, the bent portion 12 and the tab 22 of the battery cell 20 are welded.

[0056] In some embodiments, the thickness of the bend portion 12 cannot be too thick or too thin. If the thickness of the bend portion 12 is too thick, the bend portion 12 occupies more space in the height direction of the battery casing 10, thereby reducing the space utilization rate in the height direction of the battery casing 10. If the thickness of the bend portion 12 is too thin, the current flow capacity of the bend portion 12 is weak, and perforation is likely to occur when the bend portion 12 is welded to the tab 22 of the battery cell 20. Therefore, the thickness of each bend portion 12 is 0.2 to 2 mm. That is, it can reduce the space occupied by the bend portion 12 in the height direction of the battery casing 10, improve the space utilization rate in the height direction of the battery 100, and ensure the current flow capacity of the bend portion 12 and the welding effect of the bend portion 12 and the tab 22 of the battery cell 20.

[0057] Preferably, the thickness of each bent portion 12 is 0.2-0.5 mm. Specifically, the thickness of each bent portion 12 is 0.2 mm, 0.22 mm, 0.24 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.31 mm, 0.33 mm, 0.35 mm, 0.39 mm, 0.4 mm, 0.42 mm, 0.46 mm, 0.47 mm, or 0.5 mm, but is not limited to the listed values. Other values within the numerical range are also applicable.

[0058] See Figures 1 to 13 The battery housing 10 of the present invention has at least the following embodiments:

[0059] Implementation method one:

[0060] See Figures 2-3 The battery case 10 of the present invention further includes a first cover plate 15, which is disposed at the first opening, and a lower surface of the first cover plate 15 abuts against the bent portion 12. The first cover plate 15 effectively seals the first opening of the housing body 11.

[0061] See Figure 11 In some embodiments, along the height direction of the battery 100, the orthographic projection area S of each of the bent portions 12 satisfies the relationship: Wherein, D is the diameter of the first opening. By setting the orthographic projection area S of the bending portion 12, When the bending portion 12 is formed, the minimum and maximum orthographic projection areas of each bending portion 12 are effectively limited, thereby ensuring that the bending portion 12 has sufficient flow area to ensure the connection effect between the bending portion 12 and the tab 22 of the battery cell 20.

[0062] See Figure 11In some embodiments, each bent portion 12 has a groove 122 at one end near the center of the first opening. The grooves 122 of the multiple bent portions 12 collectively form a clearance area 14, which corresponds to the position of the central hole 21 of the battery cell 20 of the battery 100. The grooves 122 are located at one end of the bent portion 12 near the center of the first opening, forming the clearance area 14 after the bent portion 12 is bent. This clearance area 14 plays a crucial role in the battery 100's liquid injection process.

[0063] Specifically, when the battery 100 is being filled, the electrolyte can be injected into the housing through the relief area 14, avoiding the problem of poor filling due to structural obstruction. More importantly, because the relief area 14 corresponds to the center hole 21 of the battery cell 20, the center hole 21 of the battery cell 20 is not blocked by the bent portion 12 during the filling process of the battery 100, thereby ensuring the infiltration of the electrolyte, improving the safety of the battery 100, and extending the service life of the battery 100.

[0064] Furthermore, the radius R1 of the avoidance area 14 and the radius R2 of the center hole 21 of the battery cell 20 of the battery 100 satisfy the relationship: R2≤R1≤4R2. By setting the radius R1 of the avoidance area 14, the radius R1 of the avoidance area 14 cannot be too large or too small. If the radius R1 of the avoidance area 14 is too small, that is, when R1<R2, the area provided by the avoidance area 14 for the circulation of the electrolyte is small, which may cause the electrolyte to encounter obstacles during the injection process, the flow rate to slow down, and even the center hole 21 of part of the battery cell 20 will be blocked by the bent portion 12, thereby affecting the infiltration effect of the electrolyte. If the radius R1 of the avoidance area 14 is too large, that is, when R1>4R2, although it can ensure the smooth circulation of the electrolyte, it will also bring new problems. An excessively large radius R1 of the escape area 14 means that the escape area 14 occupies a larger area of the bend 12, which reduces the flow area of the bend 12. This means that the area available for welding the bend 12 to the tab 22 of the battery cell 20 is correspondingly reduced. This not only increases the difficulty of welding, but may also affect the connection between the bend 12 and the tab 22 of the battery cell 20, thereby reducing the reliability and stability of the battery 100.

[0065] Therefore, when the radius R1 of the avoidance region 14 is set to R2 ≤ R1 ≤ 4R2, the bent portion 12 is ensured to have sufficient flow area to ensure a good connection with the tab 22 of the battery cell 20, while also increasing the flow area of the electrolyte, ensuring sufficient electrolyte infiltration. This not only improves the performance and safety of the battery 100, but also helps to extend the service life of the battery 100.

[0066] See Figures 2-3In some embodiments, the first cover plate 15 is provided with a liquid injection hole 151 corresponding to the position of the avoidance area 14 and a sealing member 152 provided in the liquid injection hole 151 .

[0067] Implementation method 2 is different from implementation method 1 in that:

[0068] See Figures 4-6 、 Figure 12 In some embodiments, the bent portion 12 is provided on the inner wall of the shell body 11, and the outer edge of the shell body 11 has a support portion 13, and the first cover plate 15 is covered on the support portion 13. The support portion 13 provides a stable installation base for the first cover plate 15, allowing the first cover plate 15 to be accurately and quickly aligned and fixed to the shell body 11, thereby reducing the difficulty of installing the first cover plate 15.

[0069] See Figures 4-6 、 Figure 12 In some embodiments, along the thickness direction of the shell body 11, one end of the shell body 11 includes a first part and a second part, the first part is bent toward the center direction of the first opening to form the bent portion 12, and the second part extends along the height direction of the shell body 11 to form the support portion 13. The bent portion 12 and the support portion 13 are effectively made into an integrally molded structure with the shell body 11, that is, the bent portion 12, the support portion 13 and the shell body 11 are one component. This effectively enhances the overall structural stability and durability of the battery case 10. Through the one-time molding manufacturing process, the bent portion 12 and the support portion 13 are tightly combined with the shell body 11 to form a seamless connection, thereby avoiding loosening or deformation caused by long-term use or external impact.

[0070] See Figures 4-5 In some embodiments, after the bending portion 12 is bent, the distance X between the bending portion 12 and the top surface of the support portion 13 satisfies the relationship: 0≤X≤1mm. By setting the distance X between the bending portion 12 and the top surface of the support portion 13, when the distance X is 0, that is, X=0, the top surface of the support portion 13 is flush with the upper surface of the bending portion 12, which effectively enables the support portion 13 to well fill the gap 121 formed between the first cover plate 15 and the end of the bending portion 12 away from the center of the first opening, thereby reducing the difficulty of installing the first cover plate 15. When 0<X≤1mm, a height difference is formed between the top surface of the support portion 13 and the bending portion 12, so that the support portion 13 can better provide support and positioning for the first cover plate 15, reducing the difficulty of installing the first cover plate 15.

[0071] Specifically, the distance X is 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, but is not limited to the listed values, and other values within the numerical range are also applicable.

[0072] Implementation method three:

[0073] See Figures 7-10 、 Figure 13 In some embodiments, two adjacent bent portions 12 form a weld in the gap 121. By setting the weld, the connection between the two adjacent bent portions 12 is effectively achieved, so that the gap 121 between the two adjacent bent portions 12 can be sealed by welding, thereby achieving the purpose of effectively closing the first opening of the shell body 11. Such a design enables the bent portion 12 itself to serve as a top cover, without the need to additionally install a top cover to seal the first opening of the shell body 11. At the same time, the bent portion 12 can also be connected to the tab 22 of the battery cell 20 during the welding process to ensure the conductive performance of the battery 100.

[0074] Of course, the tabs 22 of the battery cell 20 may also be welded to other areas of the bent portion 12 to enhance the connection between the tabs 22 of the battery cell 20 and the bent portion 12 and improve the current carrying capacity of the battery 100 .

[0075] It is understood that if two adjacent bent portions 12 are welded to seal the gap 121 therebetween, the bent portion 12 can serve as both a collecting tray and a top cover, and can also act as an explosion-proof valve. When the bent portion 12 serves as an explosion-proof valve, the gap 121 is the weak point of the explosion-proof valve, so there is no need to provide a separate explosion-proof valve.

[0076] See Figure 10 Furthermore, the width C of the weld is greater than the width W of the gap 121. Effectively increasing the width C of the weld and the width of the welding area not only enhances the firmness of the welding, but also greatly improves the sealing performance of the welding, ensuring the integrity and reliability of the welding part.

[0077] Furthermore, the width C of the weld and the width W of the gap 121 satisfy the relationship: W<C<2mm, where 0<W≤1mm. By setting the width C of the weld, the width C of the weld cannot be too large or too small. If the width C of the weld is too small, that is, when C≤W, the width C of the weld is less than or equal to the width W of the gap 121, resulting in poor connection strength between the two adjacent bends 12 or between the bend 12 and the tab 22 of the battery cell 20, and poor sealing effect on the gap 121, thereby affecting the conductivity of the battery 100 and the sealing effect on the first opening of the shell body 11. If the width C of the weld is too large, that is, when C≥2mm, it is easy to reduce welding efficiency and increase welding costs. Therefore, when W<C<2mm, it is possible to maximize the current capacity of the battery 100 while ensuring the sealing of the gap 121, thereby improving welding efficiency and reducing welding costs.

[0078] Specifically, the width C of the weld is 1.01 mm, 1.1 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.4 mm, 1.46 mm, 1.5 mm, 1.6 mm, 1.68 mm, 1.7 mm, 1.8 mm, 1.83 mm, 1.9 mm or 1.99 mm, but is not limited to the listed values, and other values within the numerical range are also applicable.

[0079] The width W of the gap 121 is 0.01mm, 0.05mm, 0.1mm, 0.2mm, 0.26mm, 0.3mm, 0.4mm, 0.42mm, 0.5mm, 0.6mm, 0.68mm, 0.7mm, 0.8mm, 0.85mm, 0.9mm or 1mm, but is not limited to the listed values, and other values within the numerical range are also applicable.

[0080] See Figures 7-10 、 Figure 13 In some embodiments, the gap 121 has a starting end 1211 and a trailing end 1212. The starting end 1211 is located near the center of the first opening, and the trailing end 1212 is located near the sidewall of the shell body 11. A spacing 1213 is defined between the trailing end 1212 of the gap 121 and the sidewall of the shell body 11. The spacing 1213 is located between the trailing end 1212 of the gap 121 and the sidewall of the shell body 11, thereby reserving a distance between the trailing end 1212 of the gap 121 and the sidewall of the shell body 11. This reduces the difficulty of welding and improves the reliability of the weld seal.

[0081] Furthermore, the spacing 1213 cannot be too large or too small. If the spacing 1213 is too large, that is, when the spacing 1213 is greater than 1.5 mm, the end 1212 of the gap 121 is far from the side wall of the shell body 11. The end of the bent portion 12 away from the center of the first opening is easily squeezed and wrinkled during the bending process, thereby reducing the flatness of the bent portion 12, resulting in poor contact between the bent portion 12 and the tab 22 of the battery cell 20, affecting the conductivity and safety performance of the battery 100. If the spacing 1213 is too small, that is, when the spacing 1213 is less than 0.5 mm, the end 1212 of the gap 121 is close to the side wall of the shell body 11. During welding, heat concentration can easily cause the side wall of the shell body 11 to burn through, thereby increasing the difficulty of welding and sealing the gap 121 between two adjacent bent portions 12. Therefore, the spacing 1213 is set to 0.5-1.5 mm. It not only ensures the flatness of the bent portion 12 and the connection effect between the bent portion 12 and the tab 22 of the battery cell 20, but also prevents the side wall of the shell body 11 from being burned through due to heat concentration during welding, thereby reducing the difficulty of welding.

[0082] Specifically, the spacing 1213 is 0.5mm, 0.55mm, 0.6mm, 0.61mm, 0.7mm, 0.74mm, 0.8mm, 0.83mm, 0.9mm, 0.98mm, 1mm, 1.02mm, 1.1mm, 1.17mm, 1.2mm, 1.28mm, 1.3mm, 1.34mm, 1.4mm, 1.42mm or 1.5mm, but is not limited to the listed values, and other values within the numerical range are also applicable.

[0083] Of the aforementioned embodiments 1 to 3, embodiment 3 is the most preferred embodiment of the present invention. In embodiment 3, the bent portion 12 can function as both a current collecting tray and a top cover, and can also serve as an explosion-proof valve, eliminating the need for additional current collecting trays, top covers, and explosion-proof valves. Furthermore, compared to embodiments 1 and 2, embodiment 3 offers higher space utilization and a better energy density for the battery 100.

[0084] See Figures 2-3 In accordance with any of the first to third embodiments, the other end of the housing body 11 has a second opening, which is covered by a second cover plate 16. The second opening of the housing body 11 and the second cover plate 16 cooperate to cover the second opening of the housing body 11, effectively sealing the second opening of the housing body 11. The battery cell 20 can be inserted into the housing through the second opening of the housing body 11. Therefore, the bent portion 12 can be bent before or after the battery cell 20 is inserted into the housing.

[0085] Alternatively, the other end of the shell body 11 may have a second opening, and two shell bodies 11 may be provided. The second openings of the two shell bodies 11 are arranged opposite each other, and an insulating member is provided between the two shell bodies 11. This effectively allows the two shell bodies 11 to jointly form a space for accommodating the battery cell 20. The positive electrode tab of the battery cell 20 is connected to the bent portion 12 of one of the two shells, and the negative electrode tab of the battery cell 20 is connected to the bent portion 12 of the other of the two shells.

[0086] Alternatively, the other end of the shell body 11 is a closed end 17. When the other end of the shell body 11 is a closed end 17, the battery cell 20 can be inserted into the shell through the first opening of the shell body 11, and after insertion, the bent portion 12 is bent to weld the bent portion 12 to the tab 22 of the battery cell 20.

[0087] Furthermore, a through hole is provided on the second cover plate 16 or the closed end 17 of the shell body 11 , and the pole 18 of the battery 100 is passed through the through hole, and the pole 18 of the battery 100 is insulated and connected to the second cover plate 16 or the closed end 17 of the shell body 11 .

[0088] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A battery housing, characterized in that: The invention comprises a shell body (11), one end of the shell body (11) has a first opening, the edge of the first opening has a bending portion (12), and the bending portion (12) is bent toward the center of the first opening for connection with a tab (22) of a battery cell (20).

2. The battery case according to claim 1, wherein: A plurality of the bending portions (12) are provided, and the plurality of the bending portions (12) are spaced apart along the periphery of the first opening, and after the bending portions (12) are bent, a gap (121) is formed between two adjacent bending portions (12).

3. The battery case according to claim 2, wherein: Two adjacent bent portions (12) form a weld in the gap (121), and a width C of the weld is greater than a width W of the gap (121).

4. The battery case according to claim 3, wherein: The width C of the weld and the width W of the gap (121) satisfy the relationship: W<C<2mm, wherein 0<W≤1mm.

5. The battery case according to any one of claims 2 to 4, wherein: The gap (121) has a starting end (1211) and an ending end (1212), wherein the starting end (1211) is arranged close to the center of the first opening, and the ending end (1212) is arranged close to the side wall of the shell body (11), and a distance (1213) is provided between the ending end (1212) and the side wall of the shell body (11).

6. The battery case according to claim 5, wherein: The spacing (1213) is 0.5 to 1.5 mm.

7. The battery case according to claim 2, wherein: Along the height direction of the battery (100), the orthographic projection area S of each of the bent portions (12) satisfies the relationship: Wherein, D is the diameter of the first opening.

8. The battery case according to claim 2, wherein: Each of the bent portions (12) has a groove (122) at one end close to the center of the first opening, and the grooves (122) of the plurality of bent portions (12) together form an escape area (14), and the escape area (14) corresponds to the position of the central hole (21) of the battery cell (20) of the battery (100).

9. The battery case according to claim 8, wherein: The radius R1 of the avoidance area (14) and the radius R2 of the central hole (21) of the battery cell (20) of the battery (100) satisfy the relationship: R2≤R1≤4R2.

10. The battery case according to any one of claims 1 to 2 and 7 to 9, wherein: It also includes a first cover plate (15), which is arranged at the first opening, and the lower surface of the first cover plate (15) abuts against the bent portion (12).

11. The battery case according to any one of claims 1 to 2 and 7 to 9, wherein: The bending portion (12) is arranged on the inner wall of the shell body (11); the outer edge of the shell body (11) has a supporting portion (13); and a first cover plate (15) is covered on the supporting portion (13).

12. The battery case according to claim 11, wherein: Along the thickness direction of the shell body (11), one end of the shell body (11) includes a first part and a second part, the first part is bent toward the center direction of the first opening to form the bent portion (12), and along the height direction of the battery housing (10), the second part extends to form the supporting portion (13).

13. The battery case according to claim 11, wherein: After the bending portion (12) is bent, the distance X between the bending portion (12) and the top surface of the supporting portion (13) satisfies the relationship: 0≤X≤1mm.

14. The battery case according to claim 1, wherein: The other end of the shell body (11) has a second opening, and the second opening is covered with a second cover plate (16); Alternatively, the other end of the shell body (11) is a closed end (17).

15. A battery, characterized in that: The invention comprises a battery cell (20) and a battery casing according to any one of claims 1 to 14, wherein the battery cell (20) is accommodated in the battery casing (10), and the bent portion (12) is connected to the tab (22) of the battery cell (20).

16. An electrical device, characterized in that: Including the battery according to claim 15.

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