Battery case, battery, battery pack and electric device

Abstract

The present disclosure belongs to the technical field of batteries. Provided are a battery case, a battery, a battery pack and an electric device. The battery case comprises a housing and top covers. The housing has a first cavity; and each top cover comprises a cover plate and a cap, wherein the cap is provided with a second cavity in communication 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 is connected to the cover plate, and an insulating layer is provided on the surface of the cap facing the second cavity and is located on the inner wall of the cap. In this way, an electrically conductive assembly inside the battery can be conveniently connected to a battery cell in a welded manner.

Description

Battery shell, battery, battery pack and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202421795884.X, filed on July 26, 2024, and entitled "Battery shell, battery, battery pack and electric device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the technical field of battery, in particular to a battery shell, a battery, a battery pack and an electric device. BACKGROUND

[0004] With the continuous progress of battery technology and the growing market demand, the performance of batteries in new energy battery vehicles is increasingly concerned, and the energy density and safety of the battery have become important indicators to measure the performance of the battery.

[0005] In a conventional battery, the tab connects the cell with the external circuit and plays a role in current transmission. However, in the conventional battery welding assembly, the tab is usually welded with the lead-out sheet on the top cover first, and then the cover plate is welded with the shell, so the length of the tab is set longer. It is easy to cause the redundant existence of the tab part to be bent. The bent tab not only leads to the waste of the internal space of the battery, reduces the space utilization rate, but also increases the possibility of the tab contacting with other components inside the cell, thereby causing internal short circuit of the battery. SUMMARY

[0006] Embodiments of the present disclosure provide a battery shell, a battery, a battery pack and an electric device, the top cover of the battery shell is provided in a split manner with a cover plate and a cover cap, and an insulating layer is provided on the inner wall of the cover cap, solving the problems of space waste and short circuit existing in the traditional design. The energy density of the battery is improved, the overall performance and safety of the battery are improved, and a battery product with higher performance and safer reliability is provided for the market.

[0007] Embodiments of the present disclosure provide the following technical solutions to solve the above technical problems:

[0008] Firstly, the present disclosure provides a battery shell, comprising:

[0009] a shell, the shell having a first cavity;

[0010] a top cover, the top cover comprising a cover plate and a cover cap, the cover cap having a second cavity communicating with the first cavity, the cover plate being connected with the shell, the cover cap being located on the side of the cover plate away from the shell, and the cover cap being connected with the cover plate;

[0011] The cap is provided with an insulating layer on the side facing the second cavity, and the insulating layer is located on the inner wall of the cap.

[0012] The battery shell provided by the embodiments of the present disclosure includes a shell and a top cover. The 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 shell. The cap is located on the side of the cover plate away from the shell. The cap is connected to the cover plate. The cap is provided with an insulating layer on the side facing the second cavity. The insulating layer is located on the inner wall of the cap. In this way, the conductive components inside the battery can be conveniently welded to the battery cell. In a possible implementation, the cover plate and the shell can be pre-welded. Then, the tab and the lead-out sheet are passed through the cover plate and welded outside the first cavity. Finally, the cap and the cover plate are welded, reducing the possibility of short circuit caused by the tab folding inward or accumulating. The insulating layer provided on the inner wall of the cap can achieve mutual insulation between the tab and the cap.

[0013] In a possible implementation, the average thickness of the insulating layer is d, and 50≤d≤800μm.

[0014] In a possible implementation, the cover plate has a first opening. The first cavity and the second cavity communicate through the first opening. The cap covers the first opening. In this way, the first cavity of the shell and the second cavity of the cap are connected through the first opening, which can accommodate the components of the battery. The top of the shell is sealed by the cap, which can effectively prevent dust, moisture or other contaminants from entering the first cavity and the second cavity.

[0015] In a possible implementation, an insulating member is further included. The insulating member is located between the top cover and the shell. The insulating member is sleeved on the cover plate and located on the inner side of the first opening of the cover plate. In this way, the insulating member can prevent the components inside the battery from contacting the shell, avoiding the possibility of short circuit inside the battery and increasing the safety of the battery.

[0016] In a possible implementation, the insulating member is provided with a second opening. The first cavity and the second cavity communicate through the second opening. In this way, while preventing the components inside the battery from contacting the shell to cause short circuit, the insulating member connects the first cavity and the second cavity through the second opening and ensures that part of the conductive components in the second cavity contact the pole column on the cover plate, thereby realizing the normal circulation of the current inside the battery.

[0017] In a possible implementation, the insulating layer of the cap and the second opening of the insulating member at least partially overlap.

[0018] In one possible implementation, the cap has a cover edge that covers the first opening of the cover plate and is connected to the side of the cover plate facing away from the outer casing. Thus, by covering the first opening of the cover plate with the cover edge and connecting the cover plate to the cap via the cover edge, uniformity and sealing of the connection can be ensured, effectively preventing liquid or gas leakage from the first and second cavities.

[0019] In one possible implementation, the height of the cap is h, and 3.0 ≤ h ≤ 50.0 mm;

[0020] The wall thickness of the cap is D, and 0.3≤D≤4.0mm.

[0021] In one possible implementation, the cover plate is further provided with a mounting hole located on one side of the first opening, and the mounting hole is connected to the first cavity.

[0022] In one possible implementation, the insulating component further includes a first opening positioned opposite the mounting hole, through which the mounting hole communicates with the first cavity. In this way, the insulating component not only ensures battery safety but also facilitates connection and interaction between the battery's internal and external systems via the first opening, providing convenience for the battery's normal operation and maintenance.

[0023] In the second part, embodiments of this disclosure provide a battery, including:

[0024] The battery includes a battery cell, a conductive component, and the aforementioned battery casing. The battery cell is connected to the conductive component and is located within the outer shell of the battery casing. A portion of the conductive component is located within a cap of the battery casing. Thus, a first cavity provides housing space for the battery cell, and the outer shell provides protection and structural support for the battery cell. A second cavity provides housing space for the conductive component, and the cap provides protection and structural support for the conductive component.

[0025] In one possible implementation, the insulating layer of the battery casing is disposed on the inner sidewall of the cap, and the cap is insulated from the conductive component through the insulating layer. Thus, providing an insulating layer on the inner wall of the cap can prevent tip discharge of the battery. An insulating member of the battery casing is disposed between the battery cell and the top cover of the outer casing, and the cover is insulated from the conductive component through the insulating member.

[0026] In one possible implementation, the conductive component includes a tab and a lead-out piece. One end of the tab is connected to the lead-out piece, and the other end of the tab is connected to the battery cell. The tab is used to transfer the current from the battery cell to the lead-out piece. In this way, the tab connects the battery cell and the lead-out piece, ensuring that the current generated by the battery cell can flow smoothly to the lead-out piece, and then be transmitted to the electrical device through a terminal connected to the lead-out piece.

[0027] In one possible implementation, the shortest distance between the side of the insulating layer facing the cell and the lead-out piece is s, and s≥d.

[0028] In one possible implementation, the lead-out tab includes a first connector and a second connector, the first connector being connected to the second connector; one end of the tab is connected to the first connector, and one side of the insulating part of the battery casing is in contact with the second connector.

[0029] In one possible implementation, a terminal post is further included, which is fixed to the mounting hole in the cover plate and passes through a first opening in the cover plate to connect to the second connector of the lead-out piece, so that the current on the lead-out piece is transmitted to the terminal post. In this way, the current on the lead-out piece can be directly transmitted to the terminal post, which is connected to the electrical device to supply power to the device.

[0030] Thirdly, embodiments of this disclosure provide a battery pack, including:

[0031] The aforementioned battery.

[0032] Part Four, embodiments of this disclosure provide an electrical appliance, including:

[0033] The electrical device, and the aforementioned battery pack or battery, wherein the battery pack or battery provides electrical energy to the electrical device.

[0034] In addition to the technical problems solved by this disclosure, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the battery casing, battery, battery pack, and electrical equipment provided by this disclosure, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments of this disclosure or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only a part of the embodiments of this disclosure. These drawings and text descriptions are not intended to limit the scope of the concept of this disclosure in any way, but to illustrate the concept of this disclosure to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the external structure of the battery provided in an embodiment of this disclosure;

[0037] Figure 2 is an exploded view of the end of the battery provided in an embodiment of this disclosure;

[0038] Figure 3 is a cross-sectional view of the end of the battery provided in an embodiment of this disclosure;

[0039] Figure 4 is a partial enlarged view of the housing provided in an embodiment of this disclosure.

[0040] Explanation of reference numerals in the attached drawings: 100-cell; 200-conductive component; 210-tab; 220-lead plate; 230-solder mark; 221-first connector; 222-second connector; 300-outer shell; 310-first cavity; 400-top cover; 410-cover plate; 420-cap; 430-insulator; 411-first opening; 412-first protrusion; 413-second protrusion; 421-second cavity; 422-cover edge; 423-insulating layer; 431-second opening; 432-first opening; 433-second opening; 500-mounting hole; 600-filling hole; 700-terminal post. Detailed Implementation

[0041] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0042] Figure 1 is a schematic diagram of the external structure of the battery provided in the embodiment of the present disclosure, Figure 2 is an exploded view of the end of the battery provided in the embodiment of the present disclosure, Figure 3 is a cross-sectional view of the end of the battery provided in the embodiment of the present disclosure, and Figure 4 is a partially enlarged view of the casing provided in the embodiment of the present disclosure.

[0043] This disclosure provides an electrical device, which includes an electrical component and a battery pack or battery that provides electrical energy to the electrical component. For example, the electrical device can be a vehicle or an energy storage device. When the electrical device is a vehicle, the electrical component can be an electric motor, a control system, a lighting system, etc. When the electrical device is an energy storage device, the electrical component can be an inverter, a controller, etc. The battery pack can include multiple batteries, and these batteries are connected in a specific way and controlled by a control system to store and output electrical energy. The electrical energy provided by the battery pack or battery can meet the normal operation requirements of the device.

[0044] This disclosure provides a battery, as shown in Figures 1 and 2. The battery includes a battery cell 100, a conductive component 200, and a battery casing. The battery cell 100 is connected to the conductive component 200, and both are located within the battery casing. The battery cell 100 is responsible for storing and releasing electrical energy and is composed of positive and negative electrode materials, a separator, and an electrolyte. The conductive component 200 ensures a good electrical connection between the battery cell 100 and an external circuit, allowing the electrical energy of the battery cell 100 to be smoothly transferred to the external circuit.

[0045] Understandably, the battery casing is an important component of the battery. It encloses and secures the battery cell 100 and the conductive component 200, preventing mechanical damage caused by external vibrations or impacts. Furthermore, the casing 300 effectively prevents the battery cell 100 and conductive component 200 from contacting the external environment, thereby reducing the possibility of short circuits, leakage, and other battery malfunctions.

[0046] In related technologies, battery casings typically consist of an outer shell and a top cover. The outer shell is connected to the top cover, and a protruding structure is integrally formed on the top cover using stamping technology. The protruding structure has an internal cavity to accommodate the lead-out tabs. Insulation between the lead-out tabs and the top cover is achieved through a top spacer, and the lead-out tabs are laser-welded to the top cover, thus fixing the top spacer between the lead-out tabs and the top cover. Conventional battery assembly usually involves welding the tabs to the lead-out tabs on the top cover, and then welding the top cover to the outer shell. Therefore, a relatively long tab needs to be reserved during welding to the lead-out tabs. When welding the top cover to the outer shell, the tabs may fold inward, wasting space within the cavity of the protruding structure. Long tabs may also cause redundancy, potentially leading to short circuits if inserted backwards into the battery cell.

[0047] To address this issue, the battery casing provided in this embodiment comprises a top cover consisting of a cover plate 410 and a cap 420. The cover plate 410 and cap 420 are not integrally formed; they are two independently formed components. 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 casing, the electrical connection between the tab and the terminal post can be completed after the cover plate 410 is assembled. Then, the cap 420 is installed. The cap 420 is located on the side of the cover plate 410 facing away from the outer casing 300, and the tab and connecting piece can extend into the second cavity. This reduces the possibility of a short circuit caused by the tab folding or accumulating.

[0048] The battery casing provided in this embodiment, as shown in Figures 1 and 2, 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. Referring to 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, and the cap 420 is located on the side of the cover plate 410 facing away from the outer shell 300. The cap 420 is connected to the cover plate 410 but is not integrally formed. An insulating layer 423 is provided on the side of the cap 420 facing the second cavity 421. 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 applied to cover the interior of the second cavity 421 of the cap 420 by spraying, such as electrostatic spraying, flame spraying, vulcanization spraying, powder electrostatic spraying, hot melt coating, photocuring, suspension immersion coating, etc., without limitation.

[0049] In practical applications, laser or plasma cleaning power can be used to clean the battery cap 420 to ensure that the surface of the cap 420 is smooth, which is beneficial to improve the adhesion performance of the insulation layer 423 and reduce the possibility of the insulation layer 423 peeling off during subsequent use of the outer shell 300.

[0050] As shown in Figure 1, in this example, the housing 300 has openings at both ends, and each opening is provided with a top cover 400. The two top covers 400 seal both ends of the housing 300. It should be noted that the number of top covers 400 can be two, but is not limited to two. For example, if there is only one top cover 400, then one end of the housing 300 has an opening, which is sealed by the top cover 400.

[0051] It is understood that the battery casing has a cavity inside to accommodate the battery assembly. The outer shell 300 of the battery casing has a first cavity 310 inside, and the top cover 400 of the battery casing has a second cavity 421 inside. The first cavity 310 and the second cavity 421 are connected to each other and can form a space to accommodate the battery assembly.

[0052] It should be noted that the cap 420 and the cover plate 410 are not integrally molded, which facilitates the welding connection between the conductive component 200 and the cell 100 inside the battery. In one possible implementation, the cover plate 410 can be pre-welded to the outer casing 300, then the cell 100 can be welded to the conductive component 200, and finally the cap 420 can be welded to the cover plate 410.

[0053] In some embodiments of this disclosure, as shown in the figures, 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, or 800 μm, etc. Thus, by providing the insulating layer 423 on the inner wall of the cap 420, the occurrence of tip discharge in the battery can be prevented, thereby forming insulation between the conductive component 200 and the cap 420.

[0054] It should be noted that a thin average thickness of the insulation layer 423, such as less than 50 μm, may result in poor insulation performance and increase the likelihood of short circuits. Conversely, a thicker average thickness, such as greater than 800 μm, may increase the size and weight of the equipment and even affect its performance. The average thickness of the insulation layer 423 can be adjusted according to actual operating conditions. Furthermore, ensuring the uniformity and consistency of the insulation layer 423 coating can guarantee better insulation performance in practical applications.

[0055] In some embodiments of this disclosure, as shown in FIG2, the cover plate 410 has a first opening 411, the first cavity 310 and the second cavity 421 are connected through the first opening 411, and the cap 420 is placed over the first opening 411.

[0056] By creating a first opening 411 in the cover plate 410, connecting the first cavity 310 of the outer casing 300 and the second cavity 421 of the cap 420, a portion of the conductive component 200 is accommodated. Furthermore, by sealing the top of the outer casing 300 with the cap 420, dust, moisture, or other contaminants can be effectively prevented from entering the first cavity 310 and the second cavity 421, thereby preventing damage to the battery cell 100, conductive component 200, or other components inside the battery.

[0057] It should be noted that in this embodiment, the shape of the first opening 411 can be rectangular, or it can be circular, elliptical, or other polygonal. The shape and size of the first opening 411 can be changed according to the actual working conditions to meet different usage requirements.

[0058] Understandably, the size of the opening 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, ensuring a tight connection between the cover plates 410 and the cap 420, and preventing dust or moisture from entering the first cavity 310 and the second cavity 421 from the gap between the cover plate 410 and the cap 420.

[0059] In some embodiments of this disclosure, as shown in FIG3, the cover plate 410 is provided with a first protrusion 412 and a second protrusion 413. The first protrusion 412 is disposed on the side facing the first opening 411, and the cap 420 is connected to the cover plate 410 by connecting the cap 420 to the first protrusion 412. The second protrusion 413 is disposed on the side facing away from the first opening 411, and the outer shell 300 is connected to the cover plate 410 by connecting the outer shell 300 to the second protrusion 413. In this way, the first protrusion 412 and the second protrusion 413 can ensure that the cover plate 410 is simultaneously connected to the outer shell 300 and the cap 420.

[0060] In this example, the top surface of the cover plate 410 is connected to the cap 420. On the side of the cover plate 410 facing the direction of the first opening 411, i.e., 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, thereby ensuring that the connection between the cap 420 and the cover plate 410 is more stable and sealed, and improving the safety and reliability of the battery assembly.

[0061] Understandably, the bottom surface of the cover plate 410 is connected to the outer casing 300. On the side of the cover plate 410 facing away from the first opening 411, i.e., on the outer edge of the cover plate 410, there is an annular second protrusion 413. The top surface of the second protrusion 413 is connected to the top surface of the cover plate 410, and the bottom surface of the second protrusion 413 is slightly higher than the bottom surface of the cover plate 410. This ensures that the connection between the outer casing 300 and the cover plate 410 is more stable and sealed, thereby improving the safety and reliability of the battery assembly.

[0062] In some embodiments of this disclosure, as shown in FIG2, the battery casing further includes an insulating member 430. The insulating member 430 is located between the top cover 400 and the outer casing 300, and is sleeved on the cover plate 410 and located on the first opening 411 of the cover plate 410. In this way, the insulating member 430 can prevent the internal components of the battery from contacting the outer casing 300, avoiding the possibility of internal short circuits in the battery and increasing battery safety.

[0063] As shown in Figure 3, the insulating component 430 is located on the inner side of the first opening 411 of the cover plate 410, which can effectively block dust, moisture or other contaminants from entering the first cavity 310 through the first opening 411, thereby protecting the key components inside the battery such as the battery cell 100 and the conductive component 200, and improving the reliability and service life of the battery.

[0064] It should be noted that the insulating component 430 can be a plastic part or a plastic sheet. Plastic materials have good insulation properties, effectively isolating current and preventing short circuits. At the same time, plastic materials also have a certain degree of elasticity and toughness, which can adapt to cover plates 410 of different shapes and sizes, ensuring a tight fit between the insulating component 430 and the cover plate 410, further improving the insulation effect.

[0065] In some embodiments of this disclosure, as shown in Figures 2 and 3, 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, the insulating member 430 prevents short circuits caused by contact between the internal components of the battery and the outer casing 300, while simultaneously connecting the first cavity 310 and the second cavity 421 through the second opening 431 and the first opening 411, ensuring that some conductive components 200 within the second cavity 421 are in contact with the terminal posts 700 on the cover plate 410, thereby enabling normal current flow within the battery.

[0066] In some embodiments of this disclosure, as shown in Figures 3 and 4, 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. This improves insulation strength and ensures effective insulation, resulting in complete insulation between the conductive component 200 and the first opening 411 of the cover plate 410, and between the conductive component 200 and the cap 420. In other words, the insulating member 430 has an "L"-shaped cross-section, and the top surface of the insulating member 430 at least partially overlaps with the bottom end of the insulating layer 423.

[0067] Please refer to Figure 3. The cap 420 has a cap edge 422, which covers the first opening 411 of the cover plate 410 and is connected to the side of the cover plate 410 facing away from the outer casing 300. In this example, the cap edge 422 is connected to the first protrusion 412 of the cover plate 410. The cap edge 422 and the cap 420 can be integrally formed. The cap edge 422 is located on the side of the cap 420 facing the first cavity 310 and is arranged circumferentially along the cap 420. By connecting the cover plate 410 and the cap 420 through the cap edge 422 and the first protrusion 412, the uniformity and sealing of the connection can be ensured, effectively preventing liquid or gas leakage in the first cavity 310 and the second cavity 421.

[0068] In some embodiments of this disclosure, as shown in FIG3, the height of the cap 420 is h, and 3.0≤h≤50.0mm. For example, the height of the cap 420 can be 3mm, 10mm, 35mm, or 50mm, etc. It is understood that the smaller the height of the cap 420, the smaller the second cavity inside the battery cap 420. In this case, the battery can be used in small, compact devices, helping 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. This allows it to be used in devices that require more space.

[0069] 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 is understandable that a thinner wall thickness results in a lighter weight for the cap 420, while a thicker wall thickness provides better structural strength and sealing, meeting the requirements of batteries needing higher safety standards or operating in harsh environments. The height and thickness of the cap 420 can be adjusted according to actual operating conditions, which will not be elaborated here.

[0070] In some embodiments of this disclosure, as shown in Figure 2, the cover plate 410 is further provided with a mounting hole 500, which is located on one side of the first opening 411 and communicates with the first cavity 310. Thus, the mounting hole 500 ensures that components fixed in the mounting hole 500 can be connected to the battery assembly. For example, in the example of this disclosure, the mounting hole 500 is used to install and fix the terminal post 700, which can be connected to the battery cell 100 inside the first cavity 310 through the mounting hole 500.

[0071] It should be noted that the cover plate 410 may also be provided with an injection hole 600, which is connected to the first cavity 310. Electrolyte can be injected into the first cavity 310 through the injection hole 600 to activate or maintain the electrical performance of the battery cell 100 inside the first cavity 310. In this example, the mounting hole 500 and the injection hole 600 are respectively located on both sides of the first opening 411, which can avoid functional interference between the terminal post 700 of the mounting hole 500 and the injection of electrolyte through the injection hole 600, and also helps to improve the compactness and rationality of the internal structure of the battery assembly.

[0072] In some embodiments of this disclosure, as shown in FIG2, the insulating member 430 is further provided with a first opening 432, which is located opposite to the mounting hole 500. The mounting hole 500 is connected to the first cavity 310 through the first opening 432. In this way, it is ensured that the pole 700 on the mounting hole 500 is electrically connected to the conductive component 200 in the first cavity 310.

[0073] In this example, the insulating component 430 may also be provided with a second opening 433, which is located opposite to the injection hole 600. The injection hole 600 is connected to the first cavity 310 through the second opening 433. This ensures that the electrolyte can be smoothly injected into the first cavity 310 through the injection hole 600, and react chemically with other components in the first cavity 310 to generate electrical energy.

[0074] It should be noted that 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 located on both sides of the first opening 411. For example, they can also be located on the same side of the first opening 411. The position and diameter of the first opening 432 and the second opening 433 can be changed according to the actual working conditions, which will not be elaborated here.

[0075] Referring to Figures 1 to 3, the battery cell 100 is located within the first cavity 310 of the outer casing 300, and a portion of the conductive component 200 passes through the first opening 411 of the cover plate 410 and is located within 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 housing 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 via the conductive component 200, which is used to transfer the electrical energy generated by the battery cell 100 to the electrical device.

[0076] It is 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 space for the conductive component 200, and the cap 420 can provide protection for the conductive component 200.

[0077] In some embodiments of this disclosure, as shown in Figures 2 and 3, 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 from 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, ensuring that the current generated by the battery cell 100 can flow smoothly to the lead-out piece 220, and transmit the current to the electrical device through the terminal 700 connected to the lead-out piece 220.

[0078] It should be noted that, to ensure smooth current transmission, the tab 210 can be made of a material with good conductivity, such as copper or nickel. The lead-out piece 220 is welded to the tab 210, as shown in Figure 2, and there is a solder mark 230 at the connection point between the tab 210 and the lead-out piece 220.

[0079] In some embodiments of this disclosure, as shown in FIG4, 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 casing is d, and s≥d. Thus, there is a certain physical isolation distance s between the cap 420 and the lead-out piece 220, which ensures that when the battery is subjected to external impact or vibration, it prevents the lead-out piece 220 from contacting the metal cap 420 and causing a short circuit inside the battery.

[0080] Understandably, a physical isolation distance s greater than or equal to the average thickness d of the insulation layer 423 can ensure that even if the insulation layer 423 is damaged, the physical isolation distance s can still prevent the possibility of the battery lead-out piece 220 coming into contact with the metal cap 420 and causing an internal short circuit in the battery.

[0081] In some embodiments of this disclosure, as shown in Figures 2 and 3, the lead-out piece 220 includes a first connector 221 and a second connector 222, with the first connector 221 connected to the second connector 222. One end of the tab 210 is connected to the first connector 221, and one side of the insulating member 430 of the battery casing is in contact with the second connector 222.

[0082] The battery cell 100 and the first connector 221 are connected by welding through the tab 210. The first connector 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 connector 221. The second cavity 421 of the cap 420 can accommodate the tab 210 and the first connector 221, preventing the tab 210 from folding inward or piling up inside the second cavity 421.

[0083] The second connecting piece is connected to the first connecting piece and 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 to the outside of the outer casing 300. It is understood that the abutment of one side of the insulating layer 423 against the bottom surface of the insulating member 430 helps to fix the position of the lead-out piece 220 and increase the stability of the internal structure of the battery.

[0084] In some embodiments of this disclosure, as shown in Figures 1 and 2, a terminal post 700 is further included. The terminal post 700 is fixed to the mounting hole 500 of the cover plate 410, and passes through the first opening 432 of the cover plate 410 to connect to the second connector 222 of the lead-out piece 220, so that the current on the lead-out piece 220 can be transmitted to the terminal post 700. In this way, the current on the lead-out piece 220 can be directly transmitted to the terminal post 700, which is connected to the electrical device to supply power to the device. It should be noted that the shape and size 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 securely fixed to the cover plate 410.

[0085] It should be noted that tip discharge refers to a discharge phenomenon that occurs inside a battery, especially in high-voltage or high-energy-density batteries, due to the tip effect of certain conductive components, resulting in an excessively high local electric field intensity. Tip discharge can not only lead to energy loss within the battery but also damage the battery and even cause safety accidents.

[0086] The terms "upper" and "lower" are used to describe the relative positional relationship of the various structures in the accompanying drawings. They are only for the purpose of clarity of description and are not intended to limit the scope of implementation of this disclosure. Changes or adjustments to the relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this disclosure.

[0087] It should be noted that, in this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0088] Furthermore, in this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A battery case, comprising: a shell (300) having a first cavity (310) ; a top cover (400) comprising a cover plate (410) and a cover cap (420), the cover cap (420) having a second cavity (421) in communication with the first cavity (310), the cover plate (410) being connected with the shell (300), the cover cap (420) being located on a side of the cover plate (410) away from the shell (300), and the cover cap (420) being connected with the cover plate (410) ; an insulating layer (423) being provided on a side of the cover cap (420) facing the second cavity (421), the insulating layer (423) being located on an inner wall of the cover cap (420). 2.The battery case according to claim 1, wherein the insulating layer (423) has an average thickness d, and 50 ≤ d ≤ 800 μm. 3.The battery case according to claim 1 or 2, wherein the cover plate (410) has a first opening (411), the first cavity (310) and the second cavity (421) being in communication through the first opening (411), and the cover cap (420) covering the first opening (411). 4.The battery case according to claim 3, further comprising an insulating member (430), the insulating member (430) being located between the top cover (400) and the shell (300), and the insulating member (430) being sleeved on the cover plate (410) and located on an inner side of the first opening (411) of the cover plate (410). 5.The battery case according to claim 4, wherein the insulating member (430) has a second opening (431), the first cavity (310) and the second cavity (421) being in communication through the second opening (431). 6.The battery case according to claim 5, wherein the insulating layer (423) of the cover cap (420) and the second opening (431) of the insulating member (430) at least partially overlap. 7.The battery case according to claim 6, wherein the cover cap (420) has a cover edge (422), the cover edge (422) covering the first opening (411) of the cover plate (410), and the cover edge (422) being connected with a side of the cover plate (410) away from the shell (300). 8.The battery case according to claim 6 or 7, wherein the cover cap (420) has a height h, and 3.0 ≤ h ≤ 50.0 mm; the cover cap (420) has a wall thickness D, and 0.3 ≤ D ≤ 4.0 mm. 9.The battery case according to claim 4 or 5, wherein the cover plate (410) further has a mounting hole (500), the mounting hole (500) being located on a side of the first opening (411), and the mounting hole (500) being in communication with the first cavity (310).

10. The battery case of claim 9, wherein the insulating member (430) further comprises a first opening (432) disposed at a position opposite to the mounting hole (500), and the mounting hole (500) is in communication with the first cavity (310) through the first opening (432).

11. A battery, comprising: a battery cell (100), a conductive assembly (200), and the battery case of any one of claims 1-10; the battery cell (100) is connected to the conductive assembly (200), the battery cell (100) is located in the outer shell (300) of the battery case, and part of the conductive assembly (200) is located in the cap (420) of the battery case.

12. The battery of claim 11, wherein an inner side wall of the cap (420) is provided with an insulating layer (423), and the cap (420) is insulated from the conductive assembly (200) through the insulating layer (423); the insulating member (430) of the battery case 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 case is insulated from the conductive assembly (200) through the insulating member (430).

13. The battery of claim 12, wherein the conductive assembly (200) comprises a tab (210) and a lead-out sheet (220), one end of the tab (210) is connected to the lead-out sheet (220), the other end of the tab (210) is connected to the battery cell (100), and the tab (210) is used to transmit current of the battery cell (100) to the lead-out sheet (220).

14. The battery of claim 13, wherein the shortest distance between one side of the insulating layer (423) facing the battery cell (100) and the lead-out sheet (220) is s, and s≥d.

15. The battery of claim 13 or 14, wherein the lead-out sheet (220) comprises a first connecting member (221) and a second connecting member (222), 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 case is in contact with the second connecting member (222).

16. The battery of claim 15, further comprising a pole (700) fixed on the mounting hole (500) of the cover plate (410), and the pole (700) is connected to the second connecting member (222) of the lead-out sheet (220) through the first opening (432) of the cover plate (410), so as to transmit current on the lead-out sheet (220) to the pole (700).

17. A battery pack, comprising: the battery of any one of claims 11-16.

18. An electrical device, comprising: An electric device, and the battery pack of claim 17 or the battery of claims 11-16, the battery pack or the battery providing electric energy to the electric device.

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