Battery casing structure, battery, and electrical device

Abstract

A battery casing structure (100), a battery (200), and an electrical device (300). The battery casing (10) structure comprises a casing bottom plate (11), side plates (12) surrounding the outer periphery of the casing bottom plate (11), and a cover plate (13); the casing bottom plate (11) and the side plates (12) together define an accommodation cavity (121) having an opening; the area of the cover plate (13) is greater than the area of each side plate (12) and the cover plate (13) is arranged at the opening so as to close the opening; the surface of the cover plate (13) facing away from an accommodation cavity (121) is provided with a groove (14); and the groove (14) is has through holes (141) in communication with the accommodation cavity (121). Pole terminals (20) penetrate through the through holes (141) and are arranged in the accommodation cavity (121). In the thickness direction of the cover plate (13), the height of the groove (14) is H1, the height of the parts of the pole terminals (20) exposed from a bottom wall of the groove (14) in the direction away from the accommodation cavity (121) is H2, and the thickness of the casing (10) is H3, where H2 ≤ H1 ≤ 0.6 × H3, and H1, H2 and H3 are calculated in the same unit.

Description

Battery housing structure, battery and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202322691995.8 and application name “Battery housing structure, battery and electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of new energy technology, and in particular to a battery housing structure, a battery, and an electrical device. Background Art

[0003] The battery consists of a shell, a pole assembly and a battery cell. The pole assembly includes a pole. In the related art, the pole is installed on the side of the shell with a smaller area, and the layout space is limited. The pole is often arranged to protrude from the side, which not only takes up space but also is not conducive to the assembly of the battery.

[0004] Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a battery shell structure, a battery and an electrical device to reduce the difficulty of fixing the pole, ensure the sealing performance between the pole and the shell, and improve the yield of the battery.

[0006] In a first aspect, the present application provides a battery shell structure, comprising a shell and a pole. The shell comprises a shell bottom plate, a plurality of side plates surrounding the outer periphery of the shell bottom plate, and a cover plate. The shell bottom plate and the plurality of side plates together define a receiving cavity with an opening, and the area of ​​the cover plate is larger than the area of ​​each side plate; wherein the cover plate is arranged at the opening for closing the opening, and a groove is formed on the surface of the cover plate facing away from the receiving cavity, which is recessed toward the receiving cavity, and a through hole is formed on the bottom wall of the groove to communicate with the receiving cavity. The pole is passed through the through hole in the groove; wherein, along the thickness direction of the cover plate, the height of the groove is H1, the height of the pole exposed from the bottom wall of the groove in the direction away from the receiving cavity is H2, and the thickness of the shell is H3, H2≤H1≤0.6×H3, and H1, H2, and H3 are measured in the same unit.

[0007] The battery shell structure of the present application has a large layout space by installing the pole on a cover plate with a larger area. The position of the pole can be set according to actual needs. Since the area of ​​the cover plate is larger than the area of ​​the side plate, the pole is set on the large surface of the battery, which can reduce the difficulty of fixing and riveting the pole, and at the same time help to improve the sealing performance of the battery shell structure. In addition, a groove is provided on the cover plate, and a through hole connected to the accommodating cavity is provided at the groove, so that the pole can extend into the accommodating cavity through the through hole to achieve electrical connection with the pole core, thereby drawing out the electrical energy of the pole core. By setting H2≤H1≤0.6×H3, it can be ensured that the pole is hidden in the groove, thereby optimizing the spatial layout of the entire battery shell structure, facilitating the assembly of the battery, and at the same time contributing to the thinning of the battery.

[0008] In one embodiment, a liquid injection hole and a sealing cover are provided on the bottom wall of the groove. The liquid injection hole is communicated with the accommodating cavity, and the sealing cover is used to seal the liquid injection hole.

[0009] In this embodiment, an injection hole connected to the accommodating chamber is provided to allow electrolyte to be injected into the accommodating chamber. A sealing cover is provided to seal the injection hole. By arranging the injection hole and the sealing cover in the groove, the overall volume of the battery housing structure can be reduced, which helps optimize the spatial layout.

[0010] In one embodiment, the liquid injection hole is provided at a middle position of the groove along the width direction of the cover plate.

[0011] In this embodiment, the injection hole is arranged in the middle of the groove along the width direction of the cover plate to facilitate uniform infiltration of the electrode core by the electrolyte.

[0012] In one embodiment, along the thickness direction of the cover plate, the height of the sealing cover exposed from the bottom wall of the groove in the direction away from the accommodating cavity is H4, H4≤H1, wherein H1 and H4 are measured in the same unit.

[0013] In this embodiment, by setting the height of the sealing cover exposed from the bottom wall of the groove to be less than or equal to the height of the groove, that is, setting the sealing cover to be accommodated in the groove along the thickness direction of the cover plate, the overall volume of the battery housing structure can be further reduced.

[0014] In one embodiment, the pole includes a first pole and a second pole with opposite polarities, the through hole includes a first through hole and a second through hole arranged at intervals, the first pole is passed through the first through hole to pass through the accommodating cavity, and the second pole is passed through the second through hole to pass through the accommodating cavity.

[0015] In one embodiment, the first pole includes a plurality of first sub-poles arranged at intervals, the first through-holes correspond one-to-one to the first sub-poles, and the first sub-poles are passed through the corresponding first through-holes in the accommodating cavity, and / or the second pole includes a plurality of second sub-poles arranged at intervals, the second through-holes correspond one-to-one to the second sub-poles, and the second sub-poles are passed through the corresponding second through-holes in the accommodating cavity.

[0016] In this embodiment, the first pole includes multiple first sub-poles, and the second pole includes multiple second sub-poles. In other words, multiple first sub-poles or multiple second sub-poles are provided to extract electrical energy from the pole core. This can prevent heat concentration at the connection between the first pole or the second pole and the pole core, which can cause localized overheating and shorten the battery life.

[0017] In one embodiment, the thickness of the shell is the sum of the thickness of the shell bottom plate, the height of the side plate, and the thickness of the cover plate along the thickness direction of the cover plate.

[0018] In a second aspect, the present application provides a battery, comprising the battery housing structure and a pole core provided in any embodiment of the first aspect of the present application, wherein the pole core is accommodated in an accommodating cavity.

[0019] It can be understood that the battery of the second aspect of the present application adopts the battery shell structure provided by the first aspect of the present application, and thus also has all possible beneficial effects of any embodiment provided by the first aspect of the present application.

[0020] In one embodiment, the pole core is further provided with a protruding pole ear, and the pole column is electrically connected to the pole ear.

[0021] In one embodiment, the pole ear is protruding from the first side wall of the pole core, and the first side wall is the side wall of the pole core close to the groove along the length direction of the battery.

[0022] In one embodiment, an orthographic projection of the tab on the housing bottom plate at least partially overlaps with an orthographic projection of the groove on the housing bottom plate.

[0023] In this embodiment, the projection of the tab on the bottom surface of the housing is arranged to at least partially overlap the projection of the groove on the bottom surface of the housing, thereby facilitating connection between the electrode and the tab. In one embodiment, the battery further includes a connecting piece connected to one side of the electrode located in the accommodating cavity, and the electrode is connected to the tab via the connecting piece.

[0024] In this embodiment, since the end where the pole is connected to the tab is relatively small, that is, the contact area between the pole and the tab is relatively small, a connecting piece is provided to connect the tab and the pole to ensure the reliability of the connection between the tab and the pole.

[0025] In one embodiment, the pole includes a first pole and a second pole with opposite polarities, and the connecting plate includes a first connecting plate and a second connecting plate; the first pole includes a plurality of first sub-poles, each first sub-pole is located on one side of the accommodating cavity and is connected to a first connecting plate, and the plurality of first connecting plates form an integrated structure; and / or the second pole includes a plurality of second sub-poles, each second sub-pole is located on one side of the accommodating cavity and is connected to a second connecting plate, and the plurality of second connecting plates form an integrated structure.

[0026] In this embodiment, multiple connecting pieces connected to the sub-poles of the same polarity are provided as an integrated structure, so as to reduce the number of assembled parts, simplify the structure of the battery, and help shorten the assembly time.

[0027] In one embodiment, the housing is made of metal material.

[0028] In this embodiment, based on the good thermal conductivity and mechanical strength of metal materials, the shell can be made of metal materials such as aluminum alloy, nickel alloy, stainless steel or chromium alloy, which can enhance the mechanical strength of the shell and improve the heat dissipation performance of the battery, thereby increasing the service life of the battery.

[0029] In one embodiment, the shell is conductive, and the battery further includes a first insulating member located between the tab and the groove.

[0030] In this embodiment, the housing's conductivity allows it to serve as the positive electrode lead or negative electrode lead of the battery core. Furthermore, since the tabs need to be electrically connected to the electrodes, providing a first insulating member between the tabs and the grooves prevents electrical conduction between the tabs and the cover plate, preventing short circuits and other abnormalities, thereby improving battery safety.

[0031] In one embodiment, the battery further includes a second insulating member located between the groove and the terminal post.

[0032] In this embodiment, by providing a second insulating member between the groove and the pole, the pole and the cover plate can be prevented from being electrically connected, and abnormal phenomena such as short circuit can be avoided, thereby improving the safety of the battery.

[0033] In one embodiment, the second insulating member is used to separate the pole and the cover plate and seal the gap between the pole and the cover plate.

[0034] In this embodiment, the second insulating member is provided to prevent the pole from contacting the cover plate, thereby preventing the pole from being electrically connected to the cover plate and causing a short circuit. Furthermore, the second insulating member can ensure the sealing performance between the pole and the cover plate.

[0035] In one embodiment, the battery further includes an insulating gasket located between the tab and the bottom plate of the battery case.

[0036] In this embodiment, by providing an insulating gasket between the tabs and the bottom plate of the shell, it is possible to prevent the tabs with different polarities from being connected through the shell, thereby avoiding abnormal phenomena such as short circuits, thereby improving the safety of the battery.

[0037] In one embodiment, in the thickness direction of the battery, the periphery of the cover plate and the periphery of the shell bottom plate are respectively fixedly connected to the side plates by welding.

[0038] In this embodiment, the design can avoid stress concentration and avoid setting a transition section between the cover plate, the shell bottom plate and the side plate, thereby reducing the impact of the transition section on the size of the pole core placed in the accommodation space and improving the energy density of the battery.

[0039] In one embodiment, the notch of the groove is provided with a rounded corner, and a gap is provided between the side wall of the side plate and the side wall of the groove, and along the length direction of the battery, the width of the gap is W1, and the inner radius of the rounded corner is R1, W1≥R1, wherein W1 and R1 are measured in the same unit.

[0040] In this embodiment, the notch of the groove is rounded, and a gap is provided between the sidewalls of the side panel and the sidewalls of the groove. This allows the sidewalls of the side panel to avoid the rounded corners of the groove when the side panel and cover are assembled. This improves the assembly stability between the cover and side panels and enhances the sealing performance of the battery. The width of the gap is set to be greater than or equal to the inner radius of the rounded corner, which makes assembly between the side panel and cover easier.

[0041] In a third aspect, the present application provides an electrical device comprising a battery as in any of the above embodiments.

[0042] It can be understood that the electrical equipment provided in the third aspect of the present application also has all possible beneficial effects in the embodiments provided in the first aspect or the second aspect of the present application because it adopts the battery shell structure provided in the first aspect of the present application or the battery provided in the second aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is a schematic structural diagram of an electrical device provided in one embodiment of the present application;

[0044] FIG2 is a schematic structural diagram of a battery provided by an embodiment of the present application from one perspective;

[0045] FIG3 is a schematic diagram of an explosion of a battery provided by an embodiment of the present application;

[0046] FIG4 is a schematic structural diagram of a cover plate provided in one embodiment of the present application;

[0047] FIG5 is a partial enlarged view of a groove provided in an embodiment of the present application;

[0048] FIG6 is a schematic structural diagram of a battery provided by an embodiment of the present application from another perspective;

[0049] FIG7 is a cross-sectional view of the battery at the pole in FIG6 along the length direction;

[0050] FIG8 is a structural diagram of a battery provided in another embodiment of the present application from one perspective;

[0051] FIG9 is a cross-sectional view of a liquid injection hole along the length direction of a battery provided in one embodiment of the present application;

[0052] FIG10 is a schematic structural diagram of a battery in another embodiment of the present application;

[0053] FIG11 is a schematic diagram of an explosion of a battery in another embodiment of the present application;

[0054] FIG12 is a partial exploded view of a battery in another embodiment of the present application;

[0055] FIG13 is a cross-sectional view of one of the sub-electrode posts in FIG10 along the width direction of the battery;

[0056] FIG14 is a schematic structural diagram of a battery at one angle in another embodiment of the present application;

[0057] FIG15 is a cross-sectional view of a sub-electrode along the width direction of a battery in another embodiment of the present application;

[0058] FIG16 is a schematic diagram of one of the connection methods of the cover plate and the side plate of the present application.

[0059] Reference numerals: 300-electrical equipment; 301-body; 302-circuit board; 200-battery; 201-core; 2011-first side wall; 202-ear; 202a-first ear; 202b-second ear; 2021-sub-ear; 2021a-first sub-ear; 2021b-second sub-ear; 100-battery housing structure; 10-housing; 11-bottom plate; 12-side plate; 121-accommodation cavity; 13-cover plate; 14-groove; 141-through hole; 141a-second A through hole; 141b-a second through hole; 142-a liquid injection hole; 143-a sealing cover; 144-a rounded corner; 145-a gap; 20-a pole; 20a-a first pole; 20b-a second pole; 21-a sub-pole; 21a-a first sub-pole; 21b-a second sub-pole; 30-a first insulating member; 40-a second insulating member; 50-a connecting piece; 50a-a first connecting piece; 50b-a second connecting piece; 60-an insulating gasket; 001-a first direction; 002-a second direction; 003-a third direction. DETAILED DESCRIPTION

[0060] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0061] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, 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 on the present application.

[0062] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediary, or internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of these terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0063] Please refer to FIG1 , which is a schematic structural diagram of an electric device 300 provided in an embodiment of the present application.

[0064] As shown in Figure 1 , the power-consuming device 300 of the present application can be configured as a mobile phone, comprising a body 301, a circuit board 302, and a battery 200. The circuit board 302 and the battery 200 are both housed within the body 301, with the battery 200 connected to the circuit board 302. The battery 200 is used to provide electrical energy, and the circuit board 302 is used to implement the electrical control functions of the power-consuming device 300. It is understood that in other embodiments of the present application, the power-consuming device 300 may also be an electrically powered terminal device such as a tablet computer, a laptop computer, or a drone, as well as a vehicle such as an electric car or automobile, a household appliance, or a remote control, and this application does not specifically limit this.

[0065] Please refer to Figures 2 to 7, where Figure 2 is a structural schematic diagram of a battery 200 provided in one embodiment of the present application from one perspective; Figure 3 is an exploded schematic diagram of a battery 200 provided in one embodiment of the present application; Figure 4 is a structural schematic diagram of a cover plate 13 provided in one embodiment of the present application; Figure 5 is a local enlarged view of a groove 14 provided in one embodiment of the present application; Figure 6 is a structural schematic diagram of a battery 200 provided in one embodiment of the present application from another perspective; and Figure 7 is a cross-sectional view of the pole 20 in Figure 6 along the length direction of the battery 200.

[0066] As shown in Figures 2 to 7, the battery 200 of the present application includes a battery housing structure 100 and a pole core 201. The battery housing structure 100 includes a housing 10 and a pole core 20. The housing 10 includes a base plate 11, multiple side plates 12, and a cover plate 13. The multiple side plates 12 surround the outer periphery of the base plate 11. The base plate 11 and the multiple side plates 12 enclose a receiving cavity 121 with an opening. The cover plate 13 is connected to the side plates 12 and covers the opening to seal the receiving cavity 121. The area of ​​the base plate 11 is larger than the area of ​​each side plate 12. In other words, the area of ​​the cover plate 13 is larger than the area of ​​each side plate 12. The pole core 201 is housed and fixed within the receiving cavity 121. In this embodiment, the pole core 201 can be a wound pole core or a laminated pole core. A pole lug 202 is protruding from the first side wall 2011 of the pole core 201 for extracting electrical energy from the pole core 201. The first sidewall 2011 is one of the sidewalls of the electrode core 201 along the first direction 001. The first direction 001 is the length of the electrode core 201 and also the length of the battery 200. Specifically, the first sidewall 2011 is one of the sidewalls of the electrode core 201 along the first direction 001 that is close to the groove 14. The electrode post 20 is provided on the cover plate 13 and is electrically connected to the electrode core 201.

[0067] Specifically, the cover plate 13 is provided with a groove 14, and the groove 14 is located on the side of the cover plate 13 away from the accommodating cavity 121. Or it can be understood that the surface of the cover plate 13 away from the accommodating cavity 121 is formed with a groove 14 that is recessed toward the accommodating cavity 121. The bottom wall of the groove 14 is also provided with a through hole 141, which passes through the bottom wall of the groove 14 along the second direction 002 and is connected to the accommodating cavity 121. The second direction 002 is the thickness direction of the cover plate 13. The pole 20 is arranged on the cover plate 13. Based on the fact that the area of ​​the cover plate 13 is larger than the area of ​​the side plate 12, that is, the pole 20 is arranged on the large surface of the battery 200, the layout space is large, and the position of the pole 20 can be set according to actual needs. At the same time, it is conducive to reducing the difficulty of fixing and riveting the pole 20, and is conducive to improving the sealing performance of the battery shell structure 100 of the present application.

[0068] That is, the present application sets the pole 20 on the cover plate 13, thereby not being restricted by the thickness of the battery 200, and can ensure that sufficient fixing space is provided for the pole 20, thereby reducing the difficulty of fixing the pole 20, ensuring the sealing performance of the battery shell structure 100 of the present application, and improving the yield of the battery 200. Furthermore, the pole 20 is arranged in the groove 14 and is arranged at the through hole 141. The pole 20 is connected to the pole ear 202 through the through hole 141, so as to realize the extraction of the electric energy of the pole core 201 out of the shell 10. It can be understood that setting the pole 20 in the groove 14 can reduce the overall volume of the battery shell structure 100, which is conducive to the thinning of the battery 200.

[0069] Along the thickness direction of the cover plate 13, that is, along the second direction 002, the height of the recess 14 is H1. The height of the pole 20 protruding from the bottom wall of the recess 14 in the direction away from the accommodating cavity 121 is H2. The thickness of the housing 10 is H3, and H2 ≤ H1 ≤ 0.6 × H3, where H1, H2, and H3 are measured in the same unit. The thickness H3 of the housing 10 is the sum of the thickness of the bottom plate 11 along the second direction 002, the height of the side plate 12, and the thickness of the cover plate 13.

[0070] As can be understood, given that the thickness H3 of the housing 10 remains constant, the height H1 of the recess 14 is set to ≤ 0.6 × H3 to prevent the recess 14 from being too high. This, in turn, prevents the recess 14 from occupying too much space within the accommodating cavity 121 along the thickness of the cover plate 13, which could hinder the subsequent electrical connection between the terminal 20 and other components and the electrode core 201. This improves the yield rate of the battery 200. Furthermore, the height H2 of the terminal 20 protruding from the bottom wall of the recess 14, facing away from the accommodating cavity 121, is set to be less than or equal to the height H1 of the recess 14. This ensures that the portion of the terminal 20 exposed from the accommodating cavity 121 is completely contained within the recess 14. This avoids increasing the size of the battery 200 along the thickness of the cover plate 13, thereby improving the space utilization of the battery 200 and facilitating a thinner battery 200. Alternatively, it can be understood that setting H2 ≤ H1 ≤ 0.6 × H3 ensures that the terminal 20 is concealed within the recess 14, thereby optimizing the spatial layout of the entire battery housing structure 100 and facilitating assembly of the battery 200.

[0071] In the embodiment shown in FIG3 , there are two tabs 202 , and the two tabs 202 are spaced apart along a third direction 003 on the first sidewall 2011 of the electrode core 201 . The third direction 003 is the width of the electrode core 201 , which is also the width of the battery 200 and the width of the cover plate 13 . It should be noted that for ease of description, this application defines the two tabs 202 as a first tab 202a and a second tab 202b . The two tabs 202 have opposite electrical properties, meaning that the first tab 202a and the second tab 202b have opposite polarities. For example, if the first tab 202a is the negative electrode, the second tab 202b is the positive electrode. In another embodiment, the first tab 202a can be the positive electrode and the second tab 202b can be the negative electrode, but this is not particularly limited in this application.

[0072] In one embodiment, the number of through holes 141 is two, and the number of poles 20 is also two. It should be noted that, for the sake of ease of introduction, this application defines the two poles 20 as a first pole 20a and a second pole 20b, respectively. The through hole 141 may also include a first through hole 141a and a second through hole 141b. The first pole 20a is electrically connected to the first pole lug 202a through the first through hole 141a, and the second pole 20b is electrically connected to the second pole lug 202b through the second through hole 141b. Based on the fact that the two poles 20 are respectively connected to the pole lugs 202 with different polarities, the polarities of the two poles 20 are also different, that is, the two poles 20 are respectively a positive pole and a negative pole. The pole lug 202 cooperates with the pole 20 to lead the electrical energy of the pole core 201 out of the shell 10.

[0073] In another embodiment, the housing 10 is made of a metal material such as stainless steel, nickel alloy, or chromium alloy, that is, the housing 10 is conductive. In this case, the number of through-holes 141 and the number of poles 20 can be only one. The pole 20 passes through the through-hole 141 to electrically connect to one of the tabs 202, while the other tab 202 can be electrically connected to the housing 10. The tabs 202, pole 20, and housing 10 work together to conduct electrical energy from the pole core 201 to the outside of the housing 10.

[0074] It should be noted that, in this embodiment, based on the conductivity of the shell 10, the battery 200 of the present application is also provided with a second insulating member 40, and the second insulating member 40 is located between the groove 14 and the pole 20. Or it can be understood that the second insulating member 40 is sleeved on the periphery of the pole 20. The second insulating member 40 is used to separate the pole 20 and the shell 10, that is, to separate the pole 20 and the cover 13, to prevent the pole 20 from contacting the cover 13, thereby preventing the pole 20 from being conductive with the cover 13 and causing a short circuit. At the same time, in addition to having an insulating function, the second insulating member 40 can also be used to seal the gap between the pole 20 and the cover 13 to ensure the sealing performance between the pole 20 and the cover 13.

[0075] Please refer to FIG8 , which is a structural diagram of a battery provided in another embodiment of the present application from one viewing angle.

[0076] As shown in FIG8 , in one embodiment, the end of the terminal post 20 near the tab 202 can be connected to the tab 202 by welding or bonding, which is not particularly limited in this application. As will be appreciated, utilizing this connection method facilitates a simplified structure of the battery 200, eliminating the need for auxiliary components such as adapters, thereby improving assembly efficiency. Furthermore, this connection method can reduce the number of bends required for the tab 202, simplifying the manufacturing process.

[0077] Referring back to Figures 5 to 7 , in one embodiment, a groove 14 is provided on the surface of the cover plate 13 facing away from the electrode core 201, and the groove 14 is disposed between the side plate 12 and the first sidewall 2011 of the electrode core 201. Each through-hole 141 is disposed on the bottom wall of the groove 14, meaning that each electrode post 20 is disposed within the groove 14. Simultaneously, along the second direction 002 , i.e., along the thickness direction of the cover plate 13 , the orthographic projection of the electrode tab 202 on the surface of the housing bottom plate 11 partially overlaps with the orthographic projection of the groove 14 on the surface of the housing bottom plate 11.

[0078] It will be appreciated that in this embodiment, by providing the groove 14 on the cover plate 13, the portion of each terminal 20 exposed outside the accommodating cavity 121 is accommodated within the groove 14, thereby reducing the overall volume of the battery 200, facilitating miniaturization of the battery 200, or improving the energy density of the battery 200. At the same time, the orthographic projection of the tab 202 along the second direction 002 on the surface of the case bottom plate 11 is arranged to partially overlap with the orthographic projection of the groove 14 on the surface of the case bottom plate 11, thereby facilitating connection between the terminal 20 and the tab 202.

[0079] It should be noted that the relative positional relationship between the tab 202 and the cover plate 13 in the above embodiment is merely exemplary. For example, in another embodiment, along the second direction 002, the orthographic projection of the tab 202 on the surface of the housing bottom plate 11 and the orthographic projection of the groove 14 on the surface of the housing bottom plate 11 can completely overlap, which also facilitates electrical connection between the terminal 20 and the tab 202.

[0080] Please refer to FIG. 9 , which is a cross-sectional view of the liquid injection hole 142 along the length direction of the battery 200 provided in one embodiment of the present application.

[0081] As shown in Figures 6 and 9, in one embodiment, the cover plate 13 is further provided with a liquid injection hole 142 and a sealing cover 143. Specifically, the liquid injection hole 142 is provided on the bottom wall of the groove 14 and communicates with the accommodating cavity 121. The sealing cover 143 is used to seal the liquid injection hole 142.

[0082] As will be appreciated, a liquid injection hole 142 is provided on the bottom wall of the recess 14, communicating with the accommodating chamber 121, for injecting electrolyte into the accommodating chamber 121. A sealing cap 143 is provided to seal the liquid injection hole 142, thereby ensuring the sealing of the battery housing structure 100 of the present application. This also reduces the overall volume of the battery housing structure, facilitating an optimized spatial layout.

[0083] In one embodiment, the injection hole 142 can be set in the middle position of the groove 14 along the third direction 003 to facilitate uniform infiltration of the electrolyte into the electrode core 201, wherein the third direction 003 is the width direction of the battery 200.

[0084] In one embodiment, along the thickness direction of the cover plate 13 , the height of the sealing cover 143 protruding from the bottom wall of the recess 14 in a direction away from the accommodating cavity 121 is H4, and H4 ≤ H1, where H4 and H1 are measured in the same unit. In other words, the sealing cover 143 is arranged to be received in the recess 14 along the second direction 002 .

[0085] It can be understood that in this embodiment, the height of the sealing cover 143 exposed from the bottom wall of the groove 14 in the direction away from the accommodating cavity 121 is less than or equal to the height of the groove 14, which can further reduce the overall volume of the battery casing structure 100 of the present application.

[0086] Please refer to Figures 10 and 11. Figure 10 is a structural diagram of a battery 200 in another embodiment of the present application; Figure 11 is an explosion diagram of a battery 200 in another embodiment of the present application.

[0087] In one embodiment, the first pole tab 202a and the second pole tab 202b can each include one or more sub-pole tabs 2021. The first pole 20a and the second pole 20b can also each include one or more sub-pole tabs 21. For example, in the embodiments shown in Figures 10 and 11, the first pole tab 202a includes a first sub-pole tab 2021a, and the second pole tab 202b includes two second sub-pole tabs 2021b, and the two second sub-pole tabs 2021b have the same polarity. The first pole 20a includes a first sub-pole tab 21a, and the second pole 20b includes two second sub-pole tabs 21b. Each first sub-pole tab 21a is connected to a first sub-pole tab 2021a through a through hole 141, and each second sub-pole tab 21b is connected to a second sub-pole tab 2021b through a through hole 141.

[0088] It can be understood that in this embodiment, multiple pairs of mutually cooperating sub-pole ears 2021 and sub-pole columns 21 are provided to conduct electrical energy out of the accommodating cavity 121, so as to divide the originally centralized and unified electrical energy transmission path into multiple transmission sub-paths, thereby avoiding the heat concentration at the pole ear 202 causing local overheating, thereby being beneficial to improving the electrochemical performance of the battery 200 and extending the service life of the battery 200.

[0089] It should be noted that the number of tabs 202 and poles 20 in this embodiment is only for illustrative purposes and does not represent the actual number of tabs 202 and poles 20. That is, the number of tabs 202 and poles 20 can be adaptively adjusted according to the application scenario, and this application does not impose any special restrictions on this.

[0090] In one embodiment, there are multiple first sub-electrode tabs 2021a. The multiple first sub-electrode tabs 2021a can be gathered together and pre-welded, and then the pre-welded first sub-electrode tabs 2021a are electrically connected to the first sub-electrode column 21a. Alternatively, the multiple first sub-electrode tabs 2021a can be gathered together and directly electrically connected to the first sub-electrode column 21a.

[0091] At the same time, in this embodiment, in the thickness direction of the battery, insulating tape (not shown in the figure) can be pasted on the opposite sides of the first sub-pole tab 2021a or the second sub-pole tab 2021b to prevent the first sub-pole tab 2021a from contacting the shell and causing a short circuit in the battery.

[0092] It should be noted that when there are multiple second sub-electrode tabs 2021b, the method described in the above embodiment can also be used to electrically connect the multiple second sub-electrode tabs 2021b to the second sub-electrode column 21b. Insulating tape can also be applied to prevent the second sub-electrode tabs 2021b from contacting the housing and causing a battery short circuit. This application will not further elaborate on this.

[0093] Please refer to Figures 12 and 13. Figure 12 is a partial exploded view of a battery 200 in another embodiment of the present application; Figure 13 is a cross-sectional view of one of the sub-poles 21 in Figure 10 along the width direction of the battery 200.

[0094] As shown in Figures 10-13, in one embodiment, the battery 200 further includes a connecting piece 50, and the tab 202 is connected to the post 20 via the connecting piece 50. Specifically, one end of the post 20 can be riveted to the connecting piece 50, and then the tab 202 is electrically connected to the connecting piece 50. In other words, the connecting piece 50 can be sleeved on one end of the sub-post 21 near the sub-tab 2021, and then the sub-tab 2021 is electrically connected to the sub-post 21.

[0095] It is understandable that because the sub-pole 21 is connected to the sub-pole lug 2021 through the through-hole 141, the end of the sub-pole 21 near the sub-pole lug 2021 is smaller, and the width of the sub-pole lug 2021 is also relatively small, resulting in a smaller contact area between the sub-pole 21 and the sub-pole lug 2021. The present application increases the area of ​​the weldable region between the sub-pole 21 and the sub-pole lug 2021 by electrically connecting the sub-pole 21 and the sub-pole lug 2021 with a connecting piece 50, thereby facilitating the electrical connection between the sub-pole 21 and the sub-pole lug 2021 and ensuring the reliability of the connection between the sub-pole lug 2021 and the sub-pole 21.

[0096] Please refer to FIG. 14 , which is a structural diagram of a battery 200 at one angle in another embodiment of the present application.

[0097] As shown in Figures 10-14, the connecting piece 50 connected to the two second sub-electrode tabs 2021b is an integral structure. Specifically, the connecting piece 50 includes a first connecting piece 50a and a second connecting piece 50b; the first pole 20a includes multiple first sub-electrodes 21a, each of which is located on one side of the accommodating cavity 121 and connected to a first connecting piece 50a, and the multiple first connecting pieces 50a are an integral structure; and / or the second pole 20b includes multiple second sub-electrodes 21b, each of which is located on one side of the accommodating cavity 121 and connected to a second connecting piece 50b, and the multiple second connecting pieces 50b are an integral structure. It can be understood that, given that the two second sub-electrode tabs 2021b have the same polarity, configuring the connecting piece 50 connected to the two second sub-electrode tabs 2021b as an integral structure can reduce the number of assembled parts, thereby simplifying the structure of the battery 200 and shortening assembly time.

[0098] It should be noted that the number of second sub-electrode tabs 2021b connected to the same connecting piece 50 in the above embodiment is merely exemplary. In other embodiments, multiple second sub-electrode tabs 2021b can be connected to the same connecting piece 50, which can also reduce the number of assembled parts. Similarly, for multiple first sub-electrode tabs 2021a with the same polarity, the connecting piece 50 connected thereto can also be configured as an integrated structure to achieve the same effect. This application will not further elaborate on each of these details here.

[0099] In the embodiment shown in FIG7 , a first insulating member 30 is further provided between the tab 202 and the groove 14 . Alternatively, it can be understood that a first insulating member 30 is further provided between the connecting piece 50 and the cover plate 13 . As can be understood, since the housing 10 is conductive, providing the first insulating member 30 between the connecting piece 50 and the cover plate 13 can prevent the connecting piece 50 from being electrically connected to the housing 10, thereby preventing electrical conduction between the tabs 202 of different polarities and thus preventing abnormal phenomena such as short circuits.

[0100] As shown in FIG7 , in one embodiment, the battery 200 further includes an insulating gasket 60, which is located between the tab 202 and the shell bottom plate 11. It can be understood that the shell 10 is made of a metal material so that the shell 10 has conductivity. Providing an insulating gasket 60 between the tab 202 and the shell bottom plate 11 can prevent the tabs 202 of different polarities from being electrically connected through the shell 10, thereby avoiding abnormal phenomena such as short circuits, thereby improving the safety of the battery 200. Specifically, the insulating gasket 60 can be formed on the surface of the shell bottom plate 11 on the side close to the tab 202 by pasting insulating tape or spraying insulating material, or on the surface of the tab 202 close to the shell bottom plate 11.

[0101] Please refer to FIG. 15 , which is a cross-sectional view of the sub-electrode 21 along the width direction of the battery 200 in another embodiment of the present application.

[0102] As shown in FIG15 , in one embodiment, a sub-electrode 21 can be electrically connected to two sub-electrode tabs 2021 of the same polarity via a connecting piece 50. It is understood that this design can reduce the number of required parts, thereby simplifying the structure of the battery 200 and shortening assembly time.

[0103] It should be noted that, in some other embodiments, one sub-pole column 21 may also be electrically connected to a plurality of sub-pole tabs 2021 with the same polarity through a connecting piece 50 , and this application does not impose any particular limitation on this.

[0104] Referring back to Figure 5 , in one embodiment, the cover plate 13 and the bottom plate 11 are respectively abutted against and fixed to the side walls of the side plate 12. That is, in the thickness direction of the battery 200, the periphery of the cover plate 13 and the periphery of the bottom plate 11 can be fixedly connected to the end faces of the side plate 12 by welding. This design avoids stress concentration and the need for a transition section between the cover plate 13, the bottom plate 11, and the side plate 12, thereby reducing the impact of the transition section on the size of the electrode core 201 housed in the receiving space and improving the energy density of the battery 200.

[0105] Please refer to FIG. 16 , which is a schematic diagram of one connection method between the cover plate 13 and the side plate 12 of the present application.

[0106] As shown in FIG16 , in one embodiment, the notch of the groove 14 has rounded corners 144. As will be appreciated, since the groove 14 is formed by stamping the cover plate 13, a rounded corner 144 is typically provided to avoid stress concentration. In the embodiment shown in FIG16 , a gap 145 is provided between the sidewall of the side plate 12 and the sidewall of the groove 14. Along the length of the battery 200, the width of the gap 145 is greater than or equal to the inner radius of the rounded corner 144. Because the notch of the groove 14 has rounded corners 144, the gap 145 is provided between the sidewall of the side plate 12 and the sidewall of the groove 14. This allows the sidewall of the side plate 12 to avoid the position of the rounded corner 144 in the groove 14 during assembly of the side plate 12 and the cover plate 13, thereby improving the assembly stability between the cover plate 13 and the side plate 12 and enhancing the sealing performance of the battery 200. Furthermore, setting the width of the gap 145 greater than or equal to the inner radius of the rounded corner 144 facilitates assembly between the side plate 12 and the cover plate 13.

[0107] In one embodiment, the surface of the cover plate 13 facing away from the electrode core 201 is further provided with an explosion-proof mark (not shown). As will be appreciated, because the thickness of the explosion-proof mark is less than that of other locations on the cover plate 13, when the internal pressure of the battery 200 is excessive, the explosion-proof mark will rupture and discharge the gas inside the battery 200 to the outside, thereby relieving the pressure. This design can prevent the battery 200 from exploding and improve the safety of the battery 200.

[0108] It should be noted that, in some other embodiments, the explosion-proof mark can be provided on the shell bottom plate 11 or on the side plate 12, and this application does not impose any special limitation on this.

[0109] It should be understood that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of this application, "plurality" means two or more, unless otherwise specifically defined.

[0110] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0111] It should be understood that the application of this application is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims appended to this application. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A battery housing structure (100), characterized in that: include: A shell (10), comprising a shell bottom plate (11), a plurality of side plates (12) surrounding the outer periphery of the shell bottom plate, and a cover plate (13), wherein the shell bottom plate (11) and the plurality of side plates (12) jointly define a receiving cavity (121) having an opening, and the area of ​​the cover plate (13) is larger than the area of ​​each of the side plates (12); wherein the cover plate (13) is arranged at the opening to close the opening, and a groove (14) is formed on a surface of the cover plate (13) facing away from the receiving cavity (121) and is recessed toward the receiving cavity (121), and a through hole (141) communicating with the receiving cavity (121) is formed on the bottom wall of the groove (14); and A pole (20), wherein the pole (20) is inserted into the accommodating cavity (121) through the through hole (141); wherein, along the thickness direction of the cover plate (13), the height of the groove (14) is H1, the height of the pole (20) exposed from the bottom wall of the groove (14) in the direction away from the accommodating cavity (121) is H2, and the thickness of the shell (10) is H3, H2≤H1≤0.6×H3, and H1, H2, and H3 are measured in the same unit.

2. The battery housing structure (100) according to claim 1, characterized in that: The bottom wall of the groove (14) is provided with a liquid injection hole (142) and a sealing cover (143); the liquid injection hole (142) is communicated with the accommodating cavity (121); and the sealing cover (143) is used to seal the liquid injection hole (142).

3. The battery housing structure (100) according to claim 2, characterized in that: The liquid injection hole (142) is arranged at a middle position of the groove (14) along the width direction of the cover plate (13).

4. The battery housing structure (100) according to claim 2 or 3, characterized in that: Along the thickness direction of the cover plate (13), the height of the sealing cover (143) exposed from the bottom wall of the groove in a direction away from the accommodating cavity (121) is H4, H4≤H1, wherein H1 and H4 are measured in the same unit.

5. The battery housing structure (100) according to any one of claims 1 to 4, characterized in that: The pole (20) comprises a first pole (20a) and a second pole (20b) of opposite polarities, the through hole (141) comprises a first through hole (141a) and a second through hole (141b) arranged at intervals, the first pole (20a) is passed through the first through hole (141a) and is arranged in the accommodating cavity (121), and the second pole (20b) is passed through the second through hole (141b) and is arranged in the accommodating cavity (121).

6. The battery housing structure (100) according to claim 5, characterized in that: The first pole (20a) comprises a plurality of first sub-poles (21a) arranged at intervals, the first through-holes (141a) correspond one-to-one to the first sub-poles (21a), and the first sub-poles (21a) are arranged in the accommodating cavity (121) through the corresponding first through-holes (141a), and / or the second pole (20b) comprises a plurality of second sub-poles (21b) arranged at intervals, the second through-holes (141b) correspond one-to-one to the second sub-poles (21b), and the second sub-poles (21b) are arranged in the accommodating cavity (121) through the corresponding second through-holes (141b).

7. The battery housing structure (100) according to any one of claims 1 to 6, characterized in that: The thickness of the shell (10) is the sum of the thickness of the shell bottom plate (11) along the thickness direction of the cover plate (13), the height of the side plate (12), and the thickness of the cover plate (13).

8. A battery (200), characterized in that: It comprises a battery casing structure (100) and a pole core (201) as claimed in any one of claims 1 to 7, wherein the pole core (201) is accommodated in the accommodating cavity (121).

9. The battery (200) according to claim 8, characterized in that: The pole core (201) is also provided with a pole ear (202) protruding therefrom, and the pole column (20) is electrically connected to the pole ear (202).

10. The battery (200) according to claim 9, characterized in that: The pole ear (202) is protruding from a first side wall (2011) of the pole core (201), and the first side wall (2011) is a side wall of the pole core (201) close to the groove (14) along the length direction of the battery (200).

11. The battery (200) according to claim 9 or 10, characterized in that: The orthographic projection of the pole ear (202) on the shell bottom plate (11) at least partially overlaps with the orthographic projection of the groove (14) on the shell bottom plate (11).

12. The battery (200) according to any one of claims 9 to 11, characterized in that: The battery (200) further comprises a connecting sheet (50), wherein the connecting sheet (50) is connected to a side of the pole (20) located in the accommodating cavity (121), and the pole (20) is connected to the pole lug (202) via the connecting sheet (50).

13. The battery (200) according to claim 12, characterized in that: The pole (20) comprises a first pole (20a) and a second pole (20b) having opposite polarities, and the connecting piece (50) comprises a first connecting piece (50a) and a second connecting piece (50b); The first pole (20a) comprises a plurality of first sub-poles (21a), each of the first sub-poles (21a) being located on one side of the accommodating cavity (121) and connected to a first connecting piece (50a), and the plurality of first connecting pieces (50a) are in an integrated structure; and / or The second pole (20b) comprises a plurality of second sub-poles (21b), each of the second sub-poles (21b) being located on one side of the accommodating cavity (121) and connected to a second connecting piece (50b), and the plurality of second connecting pieces (50b) are in an integrated structure.

14. The battery (200) according to any one of claims 9 to 13, characterized in that: The housing (10) is conductive, and the battery (200) further comprises a first insulating member (30), wherein the first insulating member (30) is located between the tab (202) and the groove (14).

15. The battery (200) according to claim 14, characterized in that: The battery (200) further comprises a second insulating member (40), wherein the second insulating member (40) is located between the groove (14) and the pole (20).

16. The battery (200) according to claim 15, characterized in that: The second insulating member (40) is used to separate the pole (20) and the cover plate (13), and to seal the gap between the pole (20) and the cover plate (13).

17. The battery (200) according to any one of claims 9 to 16, characterized in that: The battery (200) further comprises an insulating gasket (60), wherein the insulating gasket (60) is located between the tab (202) and the shell bottom plate (11).

18. The battery (200) according to any one of claims 8 to 17, characterized in that: In the thickness direction of the battery (200), the periphery of the cover plate (13) and the periphery of the shell bottom plate (11) are respectively fixedly connected to the side plate (12) by welding.

19. The battery (200) according to any one of claims 8 to 18, characterized in that: The notch of the groove (14) is provided with a rounded corner (144), a gap (145) is provided between the side wall of the side plate (12) and the side wall of the groove (14), and along the length direction of the battery (200), the width of the gap (145) is W1, and the inner radius of the rounded corner (144) is R1, W1≥R1, wherein W1 and R1 are measured in the same unit.

20. An electrical device (300), characterized in that: The battery housing structure (100) comprises the battery housing structure (100) according to any one of claims 1 to 7 or the battery (200) according to any one of claims 8 to 19.

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