Battery shell, battery, battery pack and electric equipment

Abstract

The utility model provides a battery shell, a battery, a battery pack and electric equipment, and belongs to the technical field of batteries, and the battery shell comprises a shell and a top cover. The shell is provided with a first cavity. The top cover comprises a cover plate and a cover cap, the cover cap is provided with a second cavity communicated with the first cavity, the cover plate is connected with the shell, and the cover cap is located on the side, opposite to the shell, of the cover plate and connected with the cover plate. An insulating layer is arranged on the face, facing the second cavity, of the cap and located on the inner wall of the cap. Therefore, the conductive component in the battery can be conveniently welded and connected with the battery cell. In a possible implementation mode, after the cover plate and the shell are welded in advance, the tab and the lead-out sheet penetrate through the cover plate and are welded outside the first cavity, and finally the cap and the cover plate are welded, so that the possibility of short circuit of the battery caused by inward folding or accumulation of the tab is reduced, and the reliability of the battery is improved. And the insulating layer arranged on the inner wall of the cap can realize mutual insulation between the tab and the cap.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of batteries, and particularly to a battery housing, a battery, a battery pack, and an electrical device. Background Art

[0002] With the continuous progress of battery technology and the increasing market demand, the battery performance in new energy battery vehicles has attracted more and more attention. The energy density and safety of the battery have become important indicators for measuring battery performance.

[0003] In a conventional battery, the tab connects the battery cell to the external circuit and plays a role in current transmission. However, during the welding and assembly of a conventional battery, usually the tab is first welded to the lead-out piece on the top cover, and then the cover plate and the housing are welded. Therefore, the tab is set to be relatively long. It is easy to cause partial redundancy of the tab and bending. The bent tab not only results in waste of the internal space of the battery and reduces the space utilization rate, but also increases the possibility of contact between the tab and other components inside the battery cell, thus triggering a short circuit inside the battery. Summary of the Utility Model

[0004] The embodiments of the present application provide a battery housing, a battery, a battery pack, and an electrical device. The top cover of the battery housing is provided with a cover plate and a cap separately, and an insulating layer is provided on the inner wall of the cap, solving the problems of space waste and short circuit existing in the traditional design. The energy density of the battery is increased, the overall performance and safety of the battery are improved, and a higher-performance, safer and more reliable battery product is provided for the market.

[0005] The embodiments of the present application provide the following technical solutions to solve the above technical problems:

[0006] First, the embodiments of the present application provide a battery housing, including:

[0007] A housing having a first cavity;

[0008] A top cover including a cover plate and a cap. The cap has a second cavity communicating with the first cavity. The cover plate is connected to the housing, the cap is located on the side of the cover plate facing away from the housing, and the cap is connected to the cover plate;

[0009] An insulating layer is provided on the surface of the cap facing the second cavity, and the insulating layer is located on the inner wall of the cap.

[0010] Advantages of the embodiments of the present application: The battery housing provided by the embodiments of the present application includes an outer shell and a top cover. Among them, the outer shell has a first cavity. The top cover includes a cover plate and a cap. The cap has a second cavity communicating with the first cavity. The cover plate is connected to the outer shell. The cap is located on the side of the cover plate facing away from the outer shell and is connected to the cover plate. An insulating layer is provided on the surface of the cap facing the second cavity, and the insulating layer is located on the inner wall of the cap. In this way, it is convenient to weld and connect the conductive components inside the battery to the battery cells. In a possible implementation manner, the cover plate and the outer shell can be pre-welded first, then the tab and the lead-out piece are passed through the cover plate, welded outside the first cavity, and finally the cap and the cover plate are welded, reducing the possibility of battery short circuit caused by the inward folding or accumulation of the tab. And the insulating layer provided on the inner wall of the cap can achieve mutual insulation between the tab and the cap.

[0011] In a possible implementation manner, the average thickness of the insulating layer is d, and 50 ≤ d ≤ 800 μm.

[0012] In a possible implementation manner, the cover plate has a first opening, and the first cavity is connected to the second cavity through the first opening. The cap covers the first opening. In this way, by connecting the first cavity of the outer shell and the second cavity of the cap through the first opening, the components of the battery can be accommodated. By sealing the top of the outer shell with the cap, it can effectively prevent dust, moisture or other pollutants from entering the first cavity and the second cavity.

[0013] In a possible implementation manner, an insulating member is further included. The insulating member is located between the top cover and the outer shell, and the insulating member is sleeved on the cover plate and located on the inner side edge of the first opening of the cover plate. In this way, the insulating member can prevent the components inside the battery from coming into contact with the outer shell, avoiding the possibility of internal short circuit of the battery and increasing the safety of the battery.

[0014] In a possible implementation manner, the insulating member is provided with a second opening, and the first cavity is connected to the second cavity through the second opening. In this way, while preventing the components inside the battery from coming into contact with the outer shell and causing a short circuit, the first cavity and the second cavity are connected through the second opening, and it is ensured that some conductive components inside the second cavity are in contact with the pole column on the cover plate, so as to realize the normal circulation of the current inside the battery.

[0015] In a possible implementation manner, at least a part of the insulating layer of the cap overlaps with the second opening of the insulating member.

[0016] In a possible implementation, the cap has a cap edge, the cap edge covers the first opening of the cover plate, and the cap edge is connected to the side of the cover plate facing away from the housing. In this way, by covering the first opening of the cover plate with the cap edge and connecting the cover plate and the cap through the cap edge, the uniformity and tightness of the connection can be ensured, effectively preventing the leakage of liquid or gas in the first cavity and the second cavity.

[0017] In a possible implementation, the height of the cap is h, and 3.0 ≤ h ≤ 50.0 mm;

[0018] The wall thickness of the cap is D, and 0.3 ≤ D ≤ 4.0 mm.

[0019] In a possible implementation, the cover plate is further provided with a mounting hole, the mounting hole is located on one side of the first opening, and the mounting hole communicates with the first cavity.

[0020] In a possible implementation, the insulating member is further provided with a first opening, the first opening is arranged at a position opposite to the mounting hole, and the mounting hole communicates with the first cavity through the first opening. In this way, the insulating member not only ensures the safety of the battery, but also realizes the connection and interaction between the inside and the outside of the battery through the first opening, providing convenience for the normal operation and maintenance of the battery.

[0021] Second part, the embodiment of the present application provides a battery, including:

[0022] A battery cell, a conductive component, and the above-mentioned battery housing; the battery cell is connected to the conductive component, the battery cell is located inside the housing of the battery housing, and a part of the conductive component is located inside the cap of the battery housing. In this way, the first cavity provides a accommodation space for the battery cell, and the housing provides protection and structural support for the battery cell. The second cavity provides a accommodation space for the conductive component, and the cap provides protection and structural support for the conductive component.

[0023] In a possible implementation, the insulating layer of the battery housing is arranged on the inner side wall of the cap, and the cap is insulated from the conductive component through the insulating layer. In this way, by arranging the insulating layer on the inner wall of the cap, the situation of tip discharge of the battery can be avoided. The insulating member of the battery housing is arranged between the battery cell and the top cover of the housing, and the cover plate is insulated from the conductive component through the insulating member.

[0024] In a possible implementation, the conductive component includes a tab and a lead-out sheet. One end of the tab is connected to the lead-out sheet, and the other end of the tab is connected to the battery cell. The tab is used to transmit the current of the battery cell to the lead-out sheet. In this way, the tab connects the battery cell and the lead-out sheet, and the tab ensures that the current generated by the battery cell can flow smoothly to the lead-out sheet and is transmitted to the electrical device through the terminal connected to the lead-out sheet.

[0025] In a possible implementation, the shortest distance between the side of the insulating layer facing the battery cell and the lead-out sheet is s, and s ≥ d.

[0026] In a possible implementation, the lead-out sheet includes a first connecting member and a second connecting member, and the first connecting member is connected to the second connecting member; one end of the tab is connected to the first connecting member, and one side of the insulating member of the battery housing is in contact with the second connecting member.

[0027] In a possible implementation, a terminal is further included. The terminal is fixed on the mounting hole of the cover plate, and the terminal passes through the first opening of the cover plate and is connected to the second connecting member of the lead-out sheet so as to transmit the current on the lead-out sheet to the terminal. In this way, the current on the lead-out sheet can be directly transmitted to the terminal, and the terminal is connected to the electrical device, thereby supplying power to the electrical device.

[0028] Part three, an embodiment of the present application provides a battery pack, including:

[0029] The above-mentioned battery.

[0030] Part four, an embodiment of the present application provides an electrical device, including:

[0031] An electrical device, and the above-mentioned battery pack or the above-mentioned battery, and the battery pack or the battery supplies electrical energy to the electrical device.

[0032] In addition to the technical problems solved by the present application, the technical features constituting the technical solution, and the beneficial effects brought by these technical features of the technical solution described above, other technical problems that can be solved by the battery housing, battery, battery pack, and electrical device provided by the present application, other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Description of the Drawings

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments of the present application or the prior art. Obviously, the accompanying drawings in the following description are only a part of the embodiments of the present application. These drawings and the text description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0034] Figure 1 External structure schematic diagram of the battery provided by the embodiment of the present application;

[0035] Figure 2 Explosion view of the end of the battery provided by the embodiment of the present application;

[0036] Figure 3 Cross-sectional view of the end of the battery provided by the embodiment of the present application;

[0037] Figure 4 Partial enlarged view of the outer shell provided by the embodiment of the present application.

[0038] Explanation of reference numerals:

[0039] 100 - battery cell;

[0040] 200 - conductive component;

[0041] 210 - tab; 220 - lead-out piece; 230 - welding mark;

[0042] 221 - first connecting piece; 222 - second connecting piece;

[0043] 300 - outer shell;

[0044] 310 - first cavity;

[0045] 400 - top cover;

[0046] 410 - cover plate; 420 - cap; 430 - insulating part;

[0047] 411 - first opening; 412 - first protrusion; 413 - second protrusion;

[0048] 421 - second cavity; 422 - cover edge; 423 - insulating layer;

[0049] 431 - second opening; 432 - first opening hole; 433 - second opening hole;

[0050] 500 - mounting hole;

[0051] 600 - liquid injection hole;

[0052] 700 - terminal post. Specific embodiments

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0054] Figure 1 It is a schematic diagram of the external structure of the battery provided by the embodiment of the present application. Figure 2 It is an exploded view of the end of the battery provided by the embodiment of the present application. Figure 3 It is a sectional view of the end of the battery provided by the embodiment of the present application. Figure 4 It is a partial enlarged view of the outer shell provided by the embodiment of the present application.

[0055] The embodiment of the present application provides an electrical device, which includes an electrical device and a battery pack or a battery. The battery pack or the battery provides electrical energy for the electrical device. For example, the electrical device can be a vehicle or an energy storage device. When the electrical device is a vehicle, the electrical device can be a motor, a control system, a lighting system, etc. When the electrical device is an energy storage device, the electrical device can be an inverter, a controller, etc. The battery pack can include multiple batteries, and the multiple batteries realize the storage and output of electrical energy through a certain connection method and a control system. The electrical energy provided by the battery pack or the battery can be used for the electrical device to meet the normal operation of the device.

[0056] The embodiment of the present application provides a battery. Refer to Figure 1 and Figure 2 , the battery includes a battery cell 100, a conductive component 200, and a battery housing. Among them, the battery cell 100 is connected to the conductive component 200, and the battery cell 100 and the conductive component 200 are located inside the battery housing. The battery cell 100 is responsible for storing and discharging electrical energy and is composed of positive and negative electrode materials, a separator, an electrolyte, etc. The conductive component 200 ensures a good electrical connection between the battery cell 100 and the external circuit, so that the electrical energy of the battery cell 100 can be smoothly transmitted to the external circuit.

[0057] It can be understood that the battery housing is an important part of the battery. The battery housing wraps and fixes the battery cell 100 and the conductive component 200 to prevent the battery cell 100 and the conductive component 200 from being mechanically damaged by external vibrations, impacts, etc. And the outer shell 300 can also effectively prevent the battery cell 100 and the conductive component 200 from coming into contact with the external environment, thereby reducing the possibility of faults such as short circuits and liquid leakage of the battery.

[0058] In the related art, the battery housing of a battery usually consists of an outer shell and a top cover. The outer shell is connected to the top cover, and a raised structure is provided on the top cover using stamping technology. The raised structure is an integral structure with the top cover, and the interior of the raised structure has a cavity for accommodating the lead-out piece. Insulation between the lead-out piece and the top cover is achieved through a top spacer ring, and the lead-out piece and the top cover are fixed by laser welding, thereby fixing the top spacer ring between the lead-out piece and the top cover. The assembly of a conventional battery usually welds the tab to the lead-out piece on the top cover and then welds the top cover to the outer shell. Therefore, a relatively long tab needs to be reserved when welding the tab to the lead-out piece, and the tab will be folded inward when welding the top cover to the outer shell, resulting in waste of space inside the cavity of the raised structure. The relatively long tab may also cause partial redundancy of the tab, increasing the possibility of the tab being inserted backward into the battery cell and causing a short circuit.

[0059] To solve this problem, in the battery housing provided by the embodiments of the present application, the top cover consists of two parts, a cover plate 410 and a cap 420, and the cover plate 410 and the cap 420 are not integrally formed. The cover plate 410 and the cap 420 are two independently formed components. In this way, during assembly, the cover plate 410 can be installed first. Since the cap 420 has a second cavity 421 communicating with the first cavity 310 of the battery housing, after the cover plate 410 is assembled, the electrical connection between the tab and the terminal can be completed, and then the cap 420 can be installed. The cap 420 is located on the side of the cover plate 410 facing away from the outer shell 300, and part of the tab and the connecting piece can extend into the second cavity. In this way, the possibility of the tab being folded inward or piled up and causing a short circuit in the battery is reduced.

[0060] As shown in the battery housing provided by the embodiments of the present application, Figures 1 to 2 as shown, the battery housing includes an outer shell 300 and a top cover 400. The outer shell 300 has a first cavity 310. The top cover 400 includes a cover plate 410 and a cap 420. As shown in Figure 3 the cap 420 has a second cavity 421 communicating with the first cavity 310. The cover plate 410 is connected to the outer shell 300. The cap 420 is located on the side of the cover plate 410 facing away from the outer shell 300, and the cap 420 is connected to the cover plate 410 and is not integrally formed. An insulating layer 423 is provided on the surface of the cap 420 facing the second cavity 421, and the insulating layer 423 is located on the inner wall of the cap 420. It should be noted that the insulating layer 423 can be used to cover the interior of the second cavity 421 of the cap 420 by spraying, for example, electrostatic spraying, flame spraying, sulfurization spraying, powder electrostatic spraying, hot melt coating, light curing, suspension immersion coating, etc., which are not limited here.

[0061] In practical applications, the battery cap 420 can be cleaned using laser or plasma cleaning power to ensure that the surface of the cap 420 is smooth, which is beneficial to improving the adhesion performance of the insulating layer 423 and reducing the possibility of the insulating layer 423 warping at the edge during the subsequent use of the outer shell 300.

[0062] As Figure 1 shown, in the example of the present application, both ends of the outer shell 300 have openings, and a top cover 400 is provided at each opening, and the two ends of the outer shell 300 are sealed by the two top covers 400. It should be noted that the number of the top covers 400 can be two, but is not limited to two. For example, the number of the top covers 400 can be one, then one end of the outer shell 300 has an opening, and the opening is sealed by the top cover 400.

[0063] It can be understood that the inside of the battery housing has a cavity for accommodating the battery assembly. The inside of the outer shell 300 in the battery housing has a first cavity 310, and the inside of the top cover 400 in the battery housing has a second cavity 421. The first cavity 310 and the second cavity 421 are connected and communicate with each other, and a space for accommodating the battery assembly can be formed.

[0064] It should be noted that the cap 420 and the cover plate 410 are not integrally formed, which is convenient for welding the conductive component 200 inside the battery to the battery cell 100. In a possible implementation manner, the cover plate 410 and the outer shell 300 can be pre-welded first, then the battery cell 100 and the conductive component 200 are welded, and finally the cap 420 and the cover plate 410 are welded.

[0065] In some embodiments of the present application, as shown in the figure, the average thickness of the insulating layer 423 is d, and 50 ≤ d ≤ 800 μm. For example, the average thickness of the insulating layer 423 can be 50 μm, 100 μm, 600 μm, 800 μm, etc. In this way, by providing the insulating layer 423 on the inner wall of the cap 420, the situation of tip discharge of the battery can be avoided, so that insulation is formed between the conductive component 200 and the cap 420.

[0066] It should be noted that when the average thickness of the insulating layer 423 is relatively thin, such as less than 50 μm, the insulation effect may be poor, increasing the possibility of short circuit. When the average thickness of the insulating layer 423 is relatively thick, such as greater than 800 μm, the volume and weight of the device may be increased, and even the performance of the device may be affected. The average thickness of the insulating layer 423 can be changed according to actual working conditions. At the same time, ensuring the uniformity and consistency of the insulating layer 423 coating can ensure that the insulating layer 423 plays a better insulating effect in actual use.

[0067] In some embodiments of the present application, as Figure 2 shown, the cover plate 410 has a first opening 411, the first cavity 310 and the second cavity 421 are connected and communicate with each other through the first opening 411, and the cap 420 covers the first opening 411.

[0068] By opening a first opening 411 on the cover plate 410, the first cavity 310 of the housing 300 and the second cavity 421 of the cap 420 are communicated through the first opening 411, so as to accommodate part of the conductive component 200. And by sealing the top of the housing 300 with the cap 420, it can effectively prevent dust, moisture or other pollutants from entering the first cavity 310 and the second cavity 421, thereby damaging the battery cells 100, conductive components 200 or other components inside the battery.

[0069] It should be noted that in the example of this application, the shape of the first opening 411 can be rectangular, and the shape of the first opening 411 can also be circular, oval or other polygons, etc. The shape and size of the first opening 411 can be changed according to the needs of the actual working conditions to meet different usage requirements.

[0070] It can be understood that the size of the open end of the cap 420 can be slightly larger than the size of the first opening 411 on the cover plate 410, so as to ensure that the cap 420 can cover the first opening 411 of the cover plate 410, ensure the tight connection between the cover plate 410 and the cover plate 410, and prevent dust or moisture from entering the first cavity 310 and the second cavity 421 through the gap between the cover plate 410 and the cap 420.

[0071] In some embodiments of this application, as Figure 3 shown, the cover plate 410 is provided with a first protrusion 412 and a second protrusion 413. The first protrusion 412 is arranged on the surface facing the first opening 411, and the cap 420 is connected to the cover plate 410 by connecting the cap 420 with the first protrusion 412. The second protrusion 413 is arranged on the surface facing away from the first opening 411, and the housing 300 is connected to the cover plate 410 by connecting the housing 300 with the second protrusion 413. In this way, through the first protrusion 412 and the second protrusion 413, it can be ensured that the cover plate 410 is connected to the housing 300 and the cap 420 at the same time.

[0072] In the example of this application, the top surface of the cover plate 410 is connected to the cap 420. On the surface of the cover plate 410 facing the direction of the first opening 411, that is, on the inner edge of the first opening 411 of the cover plate 410, there is an annular first protrusion 412, and the bottom surface of the first protrusion 412 is connected to the bottom surface of the cover plate 410. The top surface of the first protrusion 412 is slightly lower than the top surface of the cover plate 410, so as to ensure a more stable and sealed connection between the cap 420 and the cover plate 410, and improve the safety and reliability of the battery assembly.

[0073] It can be understood that the bottom surface of the cover plate 410 is connected to the outer shell 300. On the surface of the cover plate 410 facing away from the first opening 411, that is, on the outer edge of the cover plate 410, an annular second protrusion 413 is provided, and the top surface of the second protrusion 413 is connected to the top surface of the cover plate 410. The bottom surface of the second protrusion 413 is slightly higher than the bottom surface of the cover plate 410, so as to ensure a more stable and sealed connection between the outer shell 300 and the cover plate 410, and improve the safety and reliability of the battery assembly.

[0074] In some embodiments of the present application, as Figure 2 shown, the battery housing further includes an insulating member 430. The insulating member 430 is located between the top cover 400 and the outer shell 300, and the insulating member 430 is sleeved on the cover plate 410 and located on the first opening 411 of the cover plate 410. In this way, through the insulating member 430, it is possible to prevent contact between the components inside the battery and the outer shell 300, avoid the possibility of causing a short circuit inside the battery, and increase the safety of the battery.

[0075] As Figure 3 shown, the insulating member 430 is located on the inner side edge of the first opening 411 of the cover plate 410, and can effectively block dust, moisture or other pollutants from entering the first cavity 310 through the first opening 411, thereby protecting key components such as the battery core 100 and the conductive component 200 inside the battery, and improving the reliability and service life of the battery.

[0076] It should be noted that the insulating member 430 can be a plastic part or a plastic plate. The plastic material has good insulation performance, can effectively isolate the current and prevent the occurrence of a short circuit. At the same time, the plastic material also has certain elasticity and toughness, can adapt to cover plates 410 of different shapes and sizes, ensure a tight fit between the insulating member 430 and the cover plate 410, and further improve the insulation effect.

[0077] In some embodiments of the present application, in combination with Figure 2 and Figure 3 shown, the insulating member 430 is provided with a second opening 431, and the first cavity 310 and the second cavity 421 are connected through the second opening 431 and the first opening 411. In this way, while preventing contact between the components inside the battery and the outer shell 300 from causing a short circuit, the insulating member 430 connects the first cavity 310 and the second cavity 421 through the second opening 431 and the first opening 411, and ensures that part of the conductive component 200 in the second cavity 421 is in contact with the pole column 700 on the cover plate 410, so as to realize the normal circulation of the current inside the battery.

[0078] In some embodiments of the present application, in combination with Figure 3 and Figure 4As shown, the insulating layer 423 on the inner wall of the cap 420 and the second opening 431 on the insulating member 430 at least partially overlap. In this way, the insulation strength can be improved, ensuring the insulation effect, so that complete insulation is formed between the conductive component 200 and the first opening 411 of the cover plate 410, and complete insulation is formed between the conductive component 200 and the cap 420. That is to say, the cross-section of the insulating member 430 is an "L" - shaped structure, and the top surface of the insulating member 430 and the bottom end of the insulating layer 423 at least partially overlap.

[0079] Please continue to refer to Figure 3 , the cap 420 has a cover edge 422, the cover edge 422 covers the first opening 411 of the cover plate 410, and the cover edge 422 is connected to the side of the cover plate 410 facing away from the housing 300. In the example of this application, the cover edge 422 is connected to the first protrusion 412 of the cover plate 410. The cover edge 422 and the cap 420 can be integrally formed. The cover edge 422 is arranged on the side of the cap 420 facing the first cavity 310, and the cover edge 422 is arranged annularly along the cap 420. By connecting the cover plate 410 and the cap 420 through the cover edge 422 and the first protrusion 412, the uniformity and tightness of the connection can be ensured, effectively preventing the leakage of liquid or gas in the first cavity 310 and the second cavity 421.

[0080] In some embodiments of the present application, as Figure 3 shown, the height of the cap 420 is h, and 3.0 ≤ h ≤ 50.0 mm. For example, the height of the cap 420 can be 3 mm, 10 mm, 35 mm or 50 mm, etc. It can be understood that the smaller the height of the cap 420, the smaller the second cavity inside the battery cap 420. At this time, the battery can be applied to small and compact devices, which helps to reduce the overall size and weight of the device. The larger the height of the cap 420, the larger the second cavity 421 inside the cap 420. At this time, it can be applied to devices that require more space.

[0081] The wall thickness of the cap 420 is D, and 0.3 ≤ D ≤ 4.0 mm. For example, the wall thickness of the cap 420 can be 0.3 mm, 1 mm, 3.5 mm or 4 mm, etc. It can be understood that the cap 420 with a thinner wall thickness is lighter in weight, and the cap 420 with a thicker wall thickness has better structural strength and tightness, which can meet the batteries that require higher safety standards or need to be applied in harsh working environments. The height and thickness of the cap 420 can be adjusted according to actual working conditions and will not be elaborated here.

[0082] In some embodiments of the present application, as shown in Figure 2, the cover plate 410 is further provided with a mounting hole 500, and the mounting hole 500 is located on one side of the first opening 411, and the mounting hole 500 on the cover plate 410 communicates with the first cavity 310. In this way, through the mounting hole 500, it can be ensured that the components fixed in the mounting hole 500 can be connected to the battery assembly. For example, in the example of the present application, the mounting hole 500 is used to mount and fix the pole column 700, and the pole column 700 can be connected to the battery cell 100 in the first cavity 310 through the mounting hole 500.

[0083] It should be noted that the cover plate 410 can also be provided with a liquid injection hole 600, and the liquid injection hole 600 communicates with the first cavity 310. Through the liquid injection hole 600, electrolyte can be injected into the first cavity 310 to activate or maintain the electrical performance of the battery cell 100 in the first cavity 310. In the example of the present application, the mounting hole 500 and the liquid injection hole 600 are respectively arranged on both sides of the first opening 411, which can avoid functional interference between the pole column 700 of the mounting hole 500 and the electrolyte injected through the liquid injection hole 600, and at the same time contribute to improving the compactness and rationality of the internal structure of the battery assembly.

[0084] In some embodiments of the present application, as Figure 2 shown, the insulating member 430 is further provided with a first opening 432, and the first opening 432 is arranged at a position opposite to the mounting hole 500, and the mounting hole 500 communicates with the first cavity 310 through the first opening 432. In this way, it is ensured that the pole column 700 on the mounting hole 500 is electrically connected to the conductive component 200 in the first cavity 310.

[0085] In the example of the present application, the insulating member 430 can also be provided with a second opening 433, and the second opening 433 is arranged at a position opposite to the liquid injection hole 600, and the liquid injection hole 600 communicates with the first cavity 310 through the second opening 433. In this way, it is ensured that the electrolyte can be smoothly injected into the first cavity 310 through the liquid injection hole 600 and react chemically with other components in the first cavity 310 to generate electric energy.

[0086] It should be noted that the positions of the first opening 432 and the second opening 433 on the cover plate 410 can be located on both sides of the first opening 411, but are not limited to being arranged on both sides of the first opening 411. For example, they can also be arranged on the same side of the first opening 411. The positions and aperture sizes of the first opening 432 and the second opening 433 can be changed according to actual working conditions and will not be elaborated here.

[0087] Combined with Figures 1 to 3As shown in the figure, the battery cell 100 is located in the first cavity 310 of the outer casing 300. Part of the conductive component 200 passes through the first opening 411 of the cover plate 410 and is located in the second cavity 421 of the cap 420. It should be noted that the battery cell 100 includes a positive electrode, a negative electrode, and an electrolyte. The battery cell 100 is responsible for storing and releasing electrical energy. The first cavity 310 provides a receiving space for the battery cell 100, and the outer casing 300 provides protection and structural support for the battery cell 100. The battery cell 100 is connected to the electrical device through the conductive component 200, and the conductive component 200 is used to transmit the electrical energy generated by the battery cell 100 to the electrical device.

[0088] It can be understood that one end of the conductive component 200 is connected to the battery cell 100, and the other end of the conductive component 200 is connected to the electrical device. Part of the conductive component 200 passes through the first opening 411 of the cover plate 410 and is located in the second cavity 421 of the cap 420. The second cavity 421 provides a receiving space for the conductive component 200, and the cap 420 can provide protection for the conductive component 200.

[0089] In some embodiments of the present application, as Figure 2 and Figure 3 shown, the conductive component 200 includes a tab 210 and a lead-out piece 220. One end of the tab 210 is connected to the lead-out piece 220, and the other end of the tab 210 is connected to the battery cell 100. The tab 210 is used to transmit the current of the battery cell 100 to the lead-out piece 220. In this way, the tab 210 connects the battery cell 100 and the lead-out piece 220, and the tab 210 ensures that the current generated by the battery cell 100 can flow smoothly to the lead-out piece 220, and the current is transmitted to the electrical device through the terminal post 700 connected to the lead-out piece 220.

[0090] It should be noted that to ensure the smoothness of current transmission, the tab 210 can be made of a material with good electrical conductivity, such as copper, nickel, etc. The lead-out piece 220 is connected to the tab 210 by welding. As Figure 2 shown, there is a welding mark 230 at the position where the tab 210 is connected to the lead-out piece 220.

[0091] In some embodiments of the present application, as Figure 4 shown, the shortest distance between the side of the insulating layer 423 facing the second cavity 421 and the lead-out piece 220 is s, the average thickness of the insulating layer 423 of the battery housing is d, and s ≥ d. In this way, there is a certain physical isolation distance s between the cap 420 and the lead-out piece 220, which can ensure that when the battery is subjected to external impact or vibration, it can prevent the lead-out piece 220 from touching the metal cap 420 and causing a short circuit inside the battery.

[0092] It can be understood that the physical isolation distance s is greater than or equal to the average thickness d of the insulating layer 423, which can ensure that even when the insulating layer 423 is damaged, the physical isolation distance s can still avoid the possibility of tip discharge of the lead-out tab 220 of the battery contacting the metal cap 420 and causing an internal short circuit of the battery.

[0093] In some embodiments of the present application, such as Figure 2 and Figure 3 shown, the lead-out tab 220 includes a first connecting member 221 and a second connecting member 222, and the first connecting member 221 is connected to the second connecting member 222. One end of the tab 210 is connected to the first connecting member 221, and one side of the insulating member 430 of the battery housing is in contact with the second connecting member 222.

[0094] The battery cell 100 is connected to the first connecting member 221 by welding through the tab 210, and the first connecting member 221 can pass through the first opening 411 on the cover plate 410 and be located in the second cavity 421 of the cap 420. The tab 210 ensures that the current generated by the battery cell 100 can be smoothly transmitted to the first connecting member 221, and the second cavity 421 of the cap 420 can accommodate the tab 210 and the first connecting member 221, avoiding inward folding or accumulation of the tab 210 within the second cavity 421.

[0095] The second connecting piece is connected to the first connecting piece, and the second connecting piece abuts against the bottom surface of the insulating member 430. The second connecting piece can be connected to the mounting hole 500 on the top cover 400 through the first opening 432 on the insulating member 430, so that the current on the second connecting piece can be transmitted outside the housing 300. It can be understood that abutting one side of the insulating layer 423 against the bottom surface of the insulating member 430 is beneficial to fixing the position of the lead-out tab 220 and increasing the stability of the internal structure of the battery.

[0096] In some embodiments of the present application, such as Figure 1 and Figure 2 shown, it further includes a terminal post 700. The terminal post 700 is fixed on the mounting hole 500 of the cover plate 410, and the terminal post 700 passes through the first opening 432 of the cover plate 410 and is connected to the second connecting member 222 of the lead-out tab 220, so as to transmit the current on the lead-out tab 220 to the terminal post 700. In this way, the current on the lead-out tab 220 can be directly transmitted to the terminal post 700, and the terminal post 700 is connected to the electrical device, thereby supplying power to the electrical equipment. It should be noted that the shapes and sizes of the mounting hole 500 on the cover plate 410 and the terminal post 700 need to match to ensure that the terminal post 700 can be firmly fixed on the cover plate 410.

[0097] It should be noted that tip discharge refers to the discharge phenomenon caused by the tip effect of certain conductive components inside the battery, especially in batteries with high voltage or high energy density, resulting in an excessively high local electric field intensity. Tip discharge may not only cause energy loss inside the battery, but also damage the battery and even lead to safety accidents.

[0098] Among them, terms such as "upper" and "lower" are used to describe the relative positional relationship of each structure in the drawings, only for the sake of clarity in narration, rather than to limit the scope of implementation of this application. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of this application.

[0099] It should be noted that in this application, unless otherwise clearly specified and limited, the first feature may be in direct contact with the second feature or indirectly in contact with the second feature through an intermediate medium when the first feature is "on" or "under" the second feature. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0100] In addition, in this application, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "coupled", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0101] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery housing, characterized in that, Comprising: A housing (300) having a first cavity (310); A top cover (400) including a cover plate (410) and a cap (420), the cap (420) having a second cavity (421) communicating with the first cavity (310), the cover plate (410) being connected to the housing (300), the cap (420) being located on a side of the cover plate (410) facing away from the housing (300), and the cap (420) being connected to the cover plate (410); An insulating layer (423) is provided on a surface of the cap (420) facing the second cavity (421), and the insulating layer (423) is located on an inner wall of the cap (420).

2. The battery housing according to claim 1, wherein, The average thickness of the insulating layer (423) is d, and 50 ≤ d ≤ 800 μm.

3. The battery housing according to claim 2, wherein, The cover plate (410) has a first opening (411), and the first cavity (310) communicates with the second cavity (421) through the first opening (411), and the cap (420) covers the first opening (411).

4. The battery housing according to claim 3, characterized in that, An insulating member (430) is further included, the insulating member (430) being located between the top cover (400) and the housing (300), and the insulating member (430) being sleeved on the cover plate (410) and located on an inner side edge of the first opening (411) of the cover plate (410).

5. The battery housing according to claim 4, characterized in that, The insulating member (430) is provided with a second opening (431), and the first cavity (310) communicates with the second cavity (421) through the second opening (431).

6. The battery housing according to claim 4 or 5, characterized in that, At least a part of the insulating layer (423) of the cap (420) and the second opening (431) of the insulating member (430) overlap.

7. The battery housing according to claim 6, wherein The cap (420) has a cover edge (422), the cover edge (422) covers the first opening (411) of the cover plate (410), and the cover edge (422) is connected to a surface of the cover plate (410) facing away from the housing (300).

8. The battery housing according to claim 7, wherein, The height of the cap (420) is h, and 3.0 ≤ h ≤ 50.0 mm; The wall thickness of the cap (420) is D, and 0.3 ≤ D ≤ 4.0 mm.

9. The battery housing according to claim 4, wherein The cover plate (410) is further provided with a mounting hole (500), the mounting hole (500) is located on one side of the first opening (411), and the mounting hole (500) communicates with the first cavity (310).

10. The battery housing according to claim 9, characterized in that, The insulating member (430) is further provided with a first opening (432), the first opening (432) is arranged at a position opposite to the mounting hole (500), and the mounting hole (500) communicates with the first cavity (310) through the first opening (432).

11. A battery, characterized in that, Comprising: A battery cell (100), a conductive component (200), and the battery housing according to any one of claims 1-10 above; The battery cell (100) is connected to the conductive component (200). The battery cell (100) is located within the outer shell (300) of the battery housing, and a portion of the conductive component (200) is located within the cap (420) of the battery housing.

12. The battery according to claim 11, characterized in that, An insulating layer (423) is provided on the inner sidewall of the cap (420), and the cap (420) is insulated from the conductive component (200) through the insulating layer (423); The insulating member (430) of the battery housing is disposed between the battery cell (100) and the top cover (400) of the outer shell (300), and the cover plate (410) of the battery housing is insulated from the conductive component (200) through the insulating member (430).

13. The battery according to claim 12, wherein, The conductive component (200) includes a tab (210) and a lead-out piece (220). One end of the tab (210) is connected to the lead-out piece (220), and the other end of the tab (210) is connected to the battery cell (100). The tab (210) is used to transfer the current of the battery cell (100) to the lead-out piece (220).

14. The battery according to claim 13, characterized in that, The shortest distance between the surface of the insulating layer (423) facing the battery cell (100) and the lead-out piece (220) is s, and s ≥ d.

15. The battery according to claim 14, wherein, The lead-out piece (220) includes a first connecting member (221) and a second connecting member (222), and the first connecting member (221) is connected to the second connecting member (222); One end of the tab (210) is connected to the first connecting member (221), and one surface of the insulating member (430) of the battery housing is in contact with the second connecting member (222).

16. The battery according to claim 15, characterized in that, It further includes a terminal post (700). The terminal post (700) is fixed on the mounting hole (500) of the cover plate (410), and the terminal post (700) passes through the first opening (432) of the cover plate (410) and is connected to the second connecting member (222) of the lead-out piece (220) so as to transfer the current on the lead-out piece (220) to the terminal post (700).

17. A battery pack, characterized in that, Comprising: The battery according to any one of claims 11 - 16 above.

18. An electrical device, characterized in that, Comprising: An electrical device, and the battery pack according to claim 17 above or the battery according to claims 11 - 16 above. The battery pack or the battery supplies electrical energy to the electrical device.

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