Battery cell, battery and power-consuming device

Abstract

Battery cell, including: an electrode arrangement (4) comprising an electrode body (41) as well as a first tab (42) and a second tab (43) with opposite polarities, wherein the first tab (42) and the second tab (43) extend out of the electrode body (41); a first output electrode and a second output electrode, wherein the first output electrode is electrically connected to the first tab (42) and the second output electrode is electrically connected to the second tab (43); a housing (10) for receiving the electrode arrangement (4), wherein the housing (10) is provided with a pressure relief component (21), wherein the first and second output electrodes are located at one end of the housing (10) in the first direction (z), while the pressure relief component (21) is located at the other end of the housing (10).

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] The present disclosure is based on application number PCT / CN2022 / 101981 with a filing date of June 28, 2022, and claims its priority; the entire contents of that PCT application are hereby incorporated into this disclosure by reference. TECHNICAL AREA

[0002] The present application relates to the field of battery technology, in particular a battery cell, a battery and a power-consuming device. STATE OF THE ART

[0003] Due to the advantages of lithium-ion batteries, such as high energy density, high power density, long cycle life and long storage life, they are widely used in electric vehicles.

[0004] However, improving the safety of batteries in electric vehicles during use has always been a challenge for the industry. CONTENT OF THE PRESENT INVENTION

[0005] The aim of this application is to improve the safety of batteries during use.

[0006] According to a first aspect of the present application, a battery cell is provided which comprises the following:

[0007] an electrode arrangement comprising an electrode body as well as a first tab and a second tab with opposite polarities, the first tab and the second tab being brought out of the electrode body;

[0008] a first output electrode and a second output electrode, wherein the first output electrode is electrically connected to the first tab, and wherein the second output electrode is electrically connected to the second tab;

[0009] a housing used to accommodate the electrode arrangement and provided with a pressure relief component, wherein the first and second output electrodes are located at one end of the housing in the first direction, while the pressure relief component is located at the other end of the housing.

[0010] In this embodiment, the first output electrode and the second output electrode are arranged at one end of the housing, while the pressure relief component is arranged at the other end of the housing.If a thermal runaway occurs in a battery cell, the active substance is expelled from the end where the pressure relief component is located and moves away from the first and second output electrodes of the battery cell, thus moving away from the busbar that electrically connects several battery cells. This reduces the stress on the electrical connections of the battery cells during thermal runaway and also prevents large-scale short circuits or high-voltage flashovers in the battery. This avoids thermal runaway of the entire power battery system and even fires or explosions, thereby increasing the operational safety of the power battery system.Secondly, the pressure relief component and the output electrode are located at both ends of the housing, providing sufficient space for the pressure relief component. This improves the current-carrying capacity of the output electrode, simplifies its machining, allows for more precise control of its opening pressure, and prevents welding stresses from affecting the opening pressure of the pressure relief component during busbar welding. Furthermore, the first and second output electrodes are located at the same end of the housing, which facilitates busbar assembly and connection when multiple battery cells are electrically interconnected.

[0011] In some embodiments, the housing comprises a first end wall, a second end wall opposite each other in a first direction, and a side wall located between the first end wall and the second end wall; the first end wall is provided with a first through-hole into which the electrode output section of the battery cell is mounted and insulated from the first end wall; the second end wall is provided with a pressure relief component; the electrode output section is the first output electrode, wherein the first end wall is the second output electrode.

[0012] In this embodiment, the electrode output section and the first end wall are located at the same end of the housing, while the pressure relief component is located at the other end. If thermal runaway occurs in a battery cell, the active substance is ejected from the end where the pressure relief component is located and moves away from the electrode output section and the first end wall of the battery cell, thus moving away from the busbar that electrically connects several battery cells. This reduces the impact on the electrical connections of the battery cells in the event of thermal runaway.

[0013] In some embodiments, the housing comprises a receiving section and an end cap; the receiving section has an opening which is closed by the end cap; the receiving section consists of a first end wall and a side wall; the end cap is the second end wall.

[0014] In this embodiment, the pressure relief component is arranged on an end cap independent of the receiving section, which reduces the process difficulties in providing the pressure relief component and facilitates the integral provision of the pressure relief component on the end cap, and whereby the dimensional accuracy of the weak points of the pressure relief component can be more easily controlled during machining, thereby improving the accuracy of the provision of the opening pressure of the pressure relief component, the pressure relief component can be reliably opened in the event of a thermal runaway of a battery cell, thereby improving the safety of the operation of the battery cell.

[0015] Since the first output electrode and the second output electrode are also located on the first end wall, which is integrally formed with the side wall, and not on the end cap, the tensile force exerted by the busbar on the connection between the end cap and the side wall is reduced, thus preventing fatigue at the connection, thereby reducing the influence of the busbar on the pressure relief component and, to some extent, also reducing damage to the pressure relief component during normal use of the battery cell, thus preventing premature pressure relief.

[0016] In some embodiments, the housing comprises a receiving section and an end cap; the receiving section has an opening; the end cap serves to close the opening; the receiving section is formed by the second end wall and the side wall; the end cap is the first end wall.

[0017] In this embodiment, the electrode output section is arranged on an end cap that is independent of the receiving section, making it easy to mount the electrode output section on the end cap.

[0018] In some embodiments, the first tab extends from the electrode body towards the electrode output section in the first direction, with the second tab extending from the electrode body along the first direction away from the electrode output section, the first tab being electrically connected to the electrode output section, and the second tab being electrically connected to the first end wall.

[0019] This embodiment allows the first tab and the second tab to be led out from both ends of the electrode body, which increases the current carrying capacity and easily ensures the insulation reliability between the first and second tabs, thereby improving the operational performance of the battery cell.

[0020] In some embodiments, the battery cell also includes a first and a second current collector; the first tab is electrically connected to the electrode output section via the first current collector, and the second tab is electrically connected to the first end wall via the second current collector.

[0021] In this embodiment, the first tab is electrically connected to the electrode output section via the first current collector, and the second tab is electrically connected to the first end wall via the second current collector, which facilitates welding to the tab, improves the reliability of the electrical connection between the first tab and the electrode output section, and improves the reliability of the electrical connection between the second tab and the first end wall.

[0022] In some embodiments, the second current collector is provided to be in contact with the side wall in order to establish electronic conductivity between the second tab and the first end wall.

[0023] This embodiment reduces the number of steps required to transfer electrical energy from the second tab to the first end wall, thereby improving the reliability of the electrical energy transfer.

[0024] In some embodiments, the housing comprises a receiving section and an end cap, wherein the receiving section has an opening and the end cap serves to close the opening, the second current collector is connected to the end cap, and the end cap is electrically connected to the side wall to achieve electronic conductivity between the second tab and the first end wall.

[0025] In this embodiment, the second tab is electrically connected to the end cap. If the electrical connection is made, for example, by welding, the end cap has a flatter welding surface, which facilitates welding and results in a better weld effect, thereby improving the reliability of the electrical connection between the second tab and the first end cap.

[0026] In some embodiments, the housing comprises a receiving section and an end cap, wherein the receiving section has an opening and the end cap serves to close the opening, the second current collector is in contact with the side wall, and the end cap is connected to the second current collector to establish electronic conductivity between the second tab and the first end wall.

[0027] This embodiment allows the electrical energy transferred from the second tab to be conducted to the first end cap via the two conductive paths. If a loose connection occurs in one of the conductive paths, the electrical energy can still be transferred via the other conductive path, thus improving the reliability of the energy transfer.

[0028] In some embodiments, the second flow collector is located in the first direction between the pressure relief component and the second tab, wherein the second flow collector is provided with a recessed section, the recessed section being used to allow the gas flow between the space on one side of the second flow collector facing the second tab and the space on the other side facing the pressure relief component.

[0029] In this embodiment, the electrode outlet section and the pressure relief component are located at opposite ends of the housing. By providing the recessed section on the second current collector, the high-temperature and high-pressure gas, in the event of thermal runaway in any area within the battery cell, can pass unhindered through the recessed section to the pressure relief component, allowing it to be vented to the outside in a timely manner. This improves the safety of the battery cell in the event of thermal runaway.

[0030] In some embodiments, the recess section includes at least one fourth through-hole, with the fourth through-hole being located in the central position of the second current collector.

[0031] Normally, the gas in the electrode assembly is discharged to the outside of the assembly via the tab side. By incorporating a fourth through-hole in the center of the second current collector, the gas escaping from any area of ​​the second tab can reach this fourth through-hole relatively quickly and thus smoothly reach the pressure relief component.

[0032] In some embodiments, it is provided that several fourth through holes are provided and the remaining fourth through holes are distributed around the fourth through hole in the central position.

[0033] This embodiment can usefully increase the exhaust gas area and, to a certain extent, solve the problem of premature exhaust gas release due to blockages in the central position of the second current collector.

[0034] In some embodiments, the recess section also includes several incisions, the incisions penetrating the second current collector along the first direction, and the several incisions surrounding the fourth through-hole.

[0035] In this embodiment, several incisions are provided at the base of the fourth through-hole to facilitate venting. In the event of thermal runaway in a battery cell, the gas flow can simultaneously reach the pressure relief component through the fourth through-hole and several incisions. Furthermore, the incisions have an elongated shape, which reduces the weakening of the second current collector's strength during venting and also simplifies machining.

[0036] In some embodiments, it is provided that one end of the cut is connected to the fourth through hole and extends away from the fourth through hole.

[0037] This embodiment enables reliable purging from the central position of the second current collector to the area at the outer circumference. In the event of thermal runaway in a battery cell, the gas flow can reach the pressure relief component more evenly and quickly.

[0038] In some embodiments, the recess section also includes an engraving line, the engraving line running through the second current collector along the first direction.

[0039] In this embodiment, several engraving lines are provided at the base of the fourth through-hole to facilitate venting. In the event of thermal runaway in a battery cell, the gas flow can simultaneously reach the pressure relief component through the fourth through-hole and several engraving lines. Furthermore, the engraving lines minimize the weakening of the second current collector's strength while simultaneously facilitating venting.

[0040] In some embodiments, it is provided that several engraving lines are provided, with one end of the engraving line being connected to the fourth through-hole and extending away from the fourth through-hole.

[0041] This embodiment enables reliable purging from the central position of the second current collector to the area at the outer circumference. In the event of thermal runaway in a battery cell, the gas flow can reach the pressure relief component more evenly and quickly.

[0042] In some embodiments, the first tab and the second tab are each led out from an end of the electrode body facing the electrode output section along the first direction; the first tab is electrically connected to the electrode output section, and the second tab is electrically connected to the first end wall.

[0043] This embodiment allows both the first tab and the second tab to extend from the end of the electrode body facing the electrode output section, thus enabling an electrical connection, and the first tab and the second tab only require space on one side of the electrode body, thereby reducing the height of the battery cell and improving the energy density of the battery cell.

[0044] In some embodiments, the battery cell also includes a first and a second current collector; the first tab is electrically connected to the electrode output section via the first current collector, and the second tab is electrically connected to the first end wall via the second current collector;

[0045] wherein the electrode output section comprises a base and a main body, the base being located between the first end wall and the first current collector and being used to prevent the movement of the electrode output section in the first direction away from the interior of the housing, an insulating element being provided between the first end wall and the base, and at least a part of the main body being located within the first through-hole.

[0046] The electrode output section of this embodiment can be prevented from slipping out of the first through-hole by the positioning of the base, thereby improving the reliability of the electrical connection between the electrode output section and the first current collector; the insulation between the electrode output section and the first end wall can also be achieved by the insulating element.

[0047] In some embodiments, it is provided that in the first direction the maximum thickness t1 of the base satisfies the condition 0.6 mm ≤ t1 ≤ 1.2 mm; and / or the maximum thickness t2 of the first current collector satisfies the condition 0.3 mm ≤ t2 ≤ 0.7 mm; and / or the maximum thickness t3 of the second current collector satisfies the condition 0.3 mm ≤ t3 ≤ 0.7 mm.

[0048] By specifying suitable thicknesses for the base of the electrode output section, the first current collector and the second current collector, this embodiment ensures that in the event of thermal runaway of the battery cell, the gas is discharged via the pressure relief component, thus preventing the gas from escaping from the side on which the electrode output section and the first end wall are located, thereby improving the safety of the battery cell in operation.

[0049] In some embodiments, it is provided that 0.8 mm ≤ t1 ≤ 1 mm and / or 0.4 mm ≤ t2 ≤ 0.6 mm and / or 0.4 mm ≤ t3 ≤ 0.6 mm.

[0050] In some embodiments, the electrode output section also includes a limiting projection; both the base and the limiting projection are connected to and project from the outer circumferential wall of the main body; the limiting projection and the base are located on the outside and inside of the first end wall, respectively, along the first direction and serve to clamp a part of the first end wall.

[0051] In this embodiment, the limiting projection and the base are used to clamp part of the first end wall, allowing the electrode output section to be installed more stably and reliably on the first end wall.

[0052] In some embodiments, the main body is provided with a recess, the bottom wall of the recess is connected to the first current collector to establish electronic conductivity between the electrode output section and the first tab, and the opening of the recess is provided on a side of the main body facing the interior of the housing and / or away from it.

[0053] This embodiment reduces the thickness of the electrical connection area between the main body and the first current collector by arranging the recess on the main body, thereby improving the reliability of the electrical connection between the main body and the first current collector.

[0054] In some embodiments, the bottom wall of the recess is laser-welded to the first current collector from a side of the main body facing away from the interior of the housing.

[0055] This embodiment reduces the thickness of the welding area between the main body and the first current collector by providing the recess, and the main body and the first current collector can be easily welded from the outside of the electrode output section, which improves the reliability of the weld; in addition, the metal ions generated during welding do not enter the casing, which can improve the reliability of the battery cell.

[0056] In some embodiments, the housing is circular cylindrical, and the pressure relief component is arranged in the central position on the second end wall and is circular; the pressure relief component has a pressure relief area, the diameter φ1 of the pressure relief area and the diameter φ of the housing are related 0.35≤∅1∅≤0.85 fulfill.

[0057] In this embodiment, providing the ratio between the diameter of the pressure relief area of ​​the pressure relief component and the diameter of the housing ensures two things: firstly, that in the event of thermal runaway of the battery cell, the pressure relief component has a sufficient opening area, allowing heat to be quickly dissipated from the battery cell to prevent damage to the electrode outlet section or the housing, or even heat leakage; and secondly, by ensuring the reliable opening of the pressure relief component, the strength of the housing end where the pressure relief component is located is improved to prevent the internal gas pressure of the battery cell from opening the pressure relief component during normal operation, thereby causing fluid leakage or electrical connection problems.

[0058] In some embodiments, it is provided that 15 mm ≤ φ ≤ 70 mm.

[0059] In some embodiments, it is provided that the thickness l1 of the first end wall and the thickness l2 of the second end wall satisfy the following relationship l1≥l2.

[0060] In this embodiment, the thickness of the first end wall is greater than the thickness of the second end wall, so that in the event of thermal runaway within the battery cell, the deformation of the housing on the side of the pressure relief component is greater than the deformation of the side on which the electrode output section and the first end wall are located. The gas generated by thermal runaway is reliably discharged via the pressure relief component at the second end wall, thereby preventing the gas from flowing towards the side on which the electrode output section is located and preventing severe deformation of the first end wall, thus preventing the housing from breaking and heat from escaping in the event of thermal runaway.

[0061] In some embodiments, it is provided that l1≥1.5* l2.

[0062] In some embodiments, the thickness l1 of the first end wall is in the range of 0.5 mm ≤ l1 ≤ 1 mm; and / or the thickness l2 of the second end wall is in the range of 0.3 mm ≤ l2 ≤ 1 mm.

[0063] In this embodiment, suitable thicknesses are designed for the first end wall and the second end wall, so that the housing deforms significantly in the event of thermal runaway of the battery cell under the influence of the internal high-pressure gas, in order to prevent the housing from breaking and heat from escaping in the event of thermal runaway.

[0064] In some embodiments, it is provided that 0.6 mm ≤ l1 ≤ 0.8 mm and / or 0.5 mm ≤ l2 ≤ 0.8 mm.

[0065] In some embodiments, the second end wall is provided with a notch, the area of ​​the second end wall enclosed by the notch forming the pressure relief component.

[0066] In this embodiment, in the event of thermal runaway of a battery cell, if the internal pressure exceeds the preset opening pressure of the pressure relief component, the notch can break to open the pressure relief component, and the gas flow inside the housing can escape to the outside through the opening, thus improving the safety of the battery cell during operation.

[0067] In some embodiments, it is provided that the thickness l1 of the first end wall and the thickness l3 at the notched location of the second end wall satisfy the following relationship l1≥2*l3.

[0068] In this embodiment, by providing the dimensional relationship between the thickness of the first end wall and the thickness at the notched location of the second end wall, a weak point with lower strength compared to the first end wall is formed at the notch location.In the event of thermal runaway in a battery cell, the internal gas can preferentially deform at the weak point, causing the pressure relief component to open rapidly and thus allowing the internal gas to be discharged uniformly. Furthermore, even if thermal runaway occurs on the side near the electrode outlet section, the gas can also preferentially flow towards the pressure relief component. This prevents the area containing the first end wall from undergoing significant deformation under the influence of the internal high-pressure gas, and prevents the casing from rupturing during thermal runaway, leading to thermal leaks. This improves the safety of the battery cell on the side where the electrode outlet section and the first end wall are located.

[0069] In some embodiments, it is provided that l1≥6* l3.

[0070] In some embodiments, the pressure relief component is circular and has a pressure relief area, wherein the diameter φ2 of the first through-hole and the diameter φ1 of the pressure relief area satisfy the relationship φ2≤φ1.

[0071] In this embodiment, the diameter of the first through-hole used for installing the electrode outlet section does not exceed the diameter φ of the pressure relief area, thereby improving the strength of the housing at the first end wall where the electrode outlet section is located. If the battery cell experiences thermal runaway, the gas can preferentially flow towards the pressure relief component. This prevents the area containing the first end wall from undergoing significant deformation under the influence of the internal high-pressure gas, thus preventing the housing from rupturing during thermal runaway and causing thermal leakage. This also improves the safety of the battery cell on the side where the electrode outlet section and the first end wall are located.

[0072] In some embodiments, the diameter φ2 of the first through-hole is provided to be in the size range of 8 mm ≤ φ2 ≤ 25 mm; and / or the diameter φ1 of the pressure relief area is in the size range of 20 mm ≤ φ1 ≤ 35 mm.

[0073] By designing suitable dimensions for the first through-hole and the diameter of the pressure relief area, the strength of the housing end where the electrode exit section is located can be ensured in this embodiment. If the battery cell experiences thermal runaway, the gas can preferentially flow towards the pressure relief component. This prevents the area containing the first end wall from undergoing significant deformation under the influence of the internal high-pressure gas, thus preventing the housing from rupturing during thermal runaway and causing thermal leakage. This also improves the safety of the battery cell on the side where the electrode exit section and the first end wall are located.

[0074] In some embodiments, the electrode arrangement is formed by winding a first electrode foil, a second electrode foil having opposite polarities, and an insulating element around a winding axis, the winding axis being in the same direction, with the first electrode foil and the second electrode foil each having the first tab and the second tab respectively;

[0075] The center of the electrode arrangement is provided with a second through-hole extending in the first direction, and the pressure relief component is circular and has a pressure relief area, wherein the maximum diameter φ3 of the second through-hole and the diameter φ1 of the pressure relief area satisfy the relationship φ3 ≥ 0.12 * φ1.

[0076] In this embodiment, the diameter of the second through-hole and the diameter of the pressure relief area satisfy the relationship mentioned above. In the event of thermal runaway of a battery cell, the second through-hole has a sufficiently large channel to allow the high-pressure gas inside to flow quickly to the pressure relief component. This ensures that the pressure relief component can open smoothly, preventing heat buildup inside the battery cell and avoiding significant deformation or damage to the casing that could lead to heat loss. This improves the safety of the battery cell during operation.

[0077] In some embodiments, the housing includes a second end wall, and the pressure relief component is located in the central area of ​​the second end wall.

[0078] In this embodiment, the pressure relief component is located in the central region of the end cap. In the event of thermal runaway in a battery cell, the high-temperature, high-pressure gas flow within it has a relatively short gas flow path, regardless of the direction from which it strikes the pressure relief component. This ensures that the pressure relief component opens in time, thereby improving the reliability and safety of the battery cell.

[0079] According to a second aspect of the present application, a battery is provided which comprises the battery cell of the embodiments described above.

[0080] In some embodiments, the housing comprises the first end wall, the first end wall is provided with a first through-hole into which the electrode output section of the battery cell is mounted and insulated from the first end wall, this electrode output section is the first output electrode, wherein the first end wall is the second output electrode;

[0081] The battery also includes a busbar, with several battery cells provided, one end of the busbar is electrically connected to the electrode output section of one of the battery cells, and the other end of the busbar is electrically connected to the first end wall of another battery cell.

[0082] In this embodiment, the electrode output section serves as the first output electrode of the battery cell, and the first end wall serves as the second output electrode. With multiple battery cells connected in series, parallel, or a mixed configuration within the battery, the two ends of the busbar can each be directly connected to the electrode output section or the first end wall, respectively. Since only one electrode output section is provided on the first end wall of the housing, it is advantageous to increase the electrically conductive area of ​​the electrode output section. Furthermore, the first end wall can be electrically connected relatively easily by welding or a fastener, which reduces the difficulty of connecting multiple battery cells and improves the reliability of the electrical connection, thereby ensuring the battery's operational performance and reliability.

[0083] In some embodiments, the housing comprises the first end wall, the first end wall is provided with a first through-hole into which the electrode output section of the battery cell is mounted and insulated from the first end wall, this electrode output section is the first output electrode, wherein the first end wall is the second output electrode;

[0084] wherein the battery also comprises several busbars, wherein within the same battery cell the electrode output section is electrically connected to one of the busbars, wherein the first end wall is electrically connected to another busbar.

[0085] In this embodiment, each battery cell can be electrically connected to two other battery cells via two independent busbars. Since the area of ​​the first end wall surrounding the electrode output section can be used for connecting the busbars, it is possible to adapt to various arrangements of multiple individual cells.

[0086] In some embodiments, the battery also comprises a box component and a support plate. The battery cell is mounted in the box component by means of the support plate. The support plate is provided with a third through-hole through which the discharge material exiting the pressure relief component can flow away. The pressure relief component is circular and has the pressure relief area. The minimum distance D between the pressure relief component and the inner wall of the box component, as well as the diameter φ1 of the pressure relief area, satisfy the following relationship: 0.4 * φ1 ≤ D ≤ 1.2 * φ1.

[0087] By defining a suitable distance between the pressure relief component and the inner wall of the box component in this embodiment, not only can the internal gas and active substance be effectively expelled in the event of thermal runaway of the battery cell, thus enabling rapid cooling of the battery, but also, based on compliance with safety requirements in the event of thermal runaway, the height of the individual cell is increased as much as possible, thereby increasing the energy density of the battery cell and enabling the battery to deliver greater driving power.

[0088] According to a third aspect of the present application, a power-consuming device is provided which uses the battery of the embodiment described above, wherein the battery serves to supply electrical energy to the power-consuming device.

[0089] In some embodiments, the power-consuming device comprises the vehicle, with the battery arranged between the cabin and the vehicle floor panel, the first output electrode and the second output electrode both oriented towards the cabin, while the pressure relief component is oriented towards the vehicle floor panel.

[0090] In this embodiment, in the event of a thermal runaway of the battery during use, since the pressure relief component of the battery cell is arranged facing downwards towards the vehicle floor plate, i.e., downwards, when the pressure relief component opens, the waste material released by the battery can be expelled downwards from the vehicle. This can reduce the impact of high temperature and high pressure on the cabin and passengers, and increase the safety of the vehicle during use. BRIEF DESCRIPTION OF THE DRAWING

[0091] To clarify the technical solutions of the embodiments of the present application, the drawings that must be used in embodiments of the present application are briefly described below. Obviously, the accompanying drawings in the following description represent only some embodiments of the present application, and other drawings can be derived from them without any creative effort by the person skilled in the art. Fig. Figure 1 is a schematic structural representation of some embodiments of the present application for installing the battery in the vehicle. Fig. Figure 2 is an exploded view of some embodiments of the battery of the present application. Fig.Figure 3 is a schematic structural representation of some embodiments of the battery cell of the present application. Fig. Figure 4 is an exploded view of some embodiments of the battery cell of the present application. Fig. Figure 5 is a sectional view of some embodiments of the battery cell of the present application. Fig. Figure 6 is a schematic structural representation of some exemplary embodiments of the electrode arrangement. Fig. Figure 7 is a schematic representation of the end of some embodiments of the electrode arrangement. The Fig. 8A, Fig. 8B, Fig. 8C, Fig. 8D and Fig. Figures 8E are schematic structural representations of various embodiments of the second current collector. Fig. Figure 9 is a schematic dimensional view of some embodiments of the battery cell of the present application. Fig. 10 is an enlarged view of location A in Fig. 9. Fig. Figure 11 is a schematic structural representation of the electrical connection of two battery cells. Fig. Figure 12 is a schematic structural representation of the battery cell in the battery of the present application, which is mounted on the box component via a support plate.

[0092] The dimensions in the drawings are not shown in actual proportion. DETAILED DESCRIPTION

[0093] The embodiments of the present application are described below with reference to the accompanying drawings and exemplary embodiments. The following detailed description and the accompanying drawings of the exemplary embodiments serve to illustrate the principles of the present application by way of example; however, they should not be used to limit the scope of the present application, i.e., the present application is not limited to the described exemplary embodiments.

[0094] In the description of embodiments of the present application, the term “several” refers to more than two (including two), likewise “several groups” refers to more than two groups (including two groups) and “several pieces” refers to more than two pieces (including two pieces).

[0095] In the present application, descriptions of orientations or positional relationships such as "top", "bottom", "upper side", "lower side", "front", "back", "inside" and "outside" are used; this serves only to simplify the description of the present application; they are not intended to indicate or imply that the device referred to must have a particular orientation or be designed and operated in a particular orientation, and are therefore not to be understood as limiting the scope of protection of the present application.

[0096] Furthermore, the terms "first," "second," and "third," and the like, are used for descriptive purposes only and should not be understood as indicating or implying a relative meaning. "Vertical" does not mean vertical in the strict sense, but rather within the range of permissible error tolerance. "Parallel" does not mean parallelism in the strict sense, but rather within the range of permissible error tolerance. The directional terms used in the following description refer to the directions shown in the figure and are not intended to restrict the specific structure of the present application.

[0097] In describing the present application, it should also be noted that the terms "installation", "connecting", and "connecting", unless expressly stated otherwise and limited, are to be understood in the broadest sense; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a direct connection or an indirect connection via an intermediate medium. The person skilled in the art in this field will be able to understand the specific meanings of the aforementioned terms in the present application according to specific situations.

[0098] The reference herein to an “embodiment” means that a particular feature, structure, or property described in connection with the embodiment may be included in at least some embodiments of the present application. The occurrence of this phrase at various points in the description does not necessarily all refer to the same embodiment, nor is it an independent or alternative embodiment that mutually excludes other embodiments. It is expressly and implicitly clear to those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0099] The battery cell may, for example, comprise a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and the like, the embodiments of which are not limited thereto. The battery cell may have the form of a circular cylinder, a flat body, a cuboid, or other shapes, and the embodiments of which are not limited thereto. Battery cells are generally classified into three types according to the type of encapsulation: cylindrical battery cells, square battery cells, and softpack battery cells, and the embodiments of which are not limited thereto.

[0100] A modern battery cell typically comprises a casing and an electrode assembly housed within the casing, the casing being filled with an electrolyte. The electrode assembly is primarily formed by stacking or winding a first electrode foil and a second electrode foil of opposite polarity, usually with a separator between the first and second electrode foils. The coated portions of the first and second electrode foils form the main body of the electrode assembly, while the uncoated portions of the first and second electrode foils form the first and second tabs, respectively.In a lithium-ion battery, the first electrode foil can be a cathode foil comprising a cathode current collector and a cathode coating layer arranged on both sides of the cathode current collector. The material of the cathode current collector can be, for example, aluminum, and the cathode coating can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, or the like. The second electrode foil can be an anode foil comprising an anode current collector and an anode coating layer arranged on both sides of the anode current collector. The material of the anode current collector can be, for example, copper, and the anode coating can be, for example, graphite or silicon. The first and second tabs can be arranged either together at one end of the main body or at two ends of the main body.During the charging and discharging process of the battery cell, the cathode coating and the anode coating react with the electrolyte solution, and the tab is connected to the electrode output section to form a circuit.

[0101] The pressure relief component is an element or component that actuates the battery cell to discharge internal pressure or temperature when it reaches a predetermined threshold. The threshold value varies depending on design requirements. It may depend on the material of one or more of the cathode foil, anode foil, electrolyte solution, and separator film within the battery cell. The pressure relief component can take the form of an explosion-proof valve, gas valve, pressure relief valve, or safety valve, and may specifically incorporate a pressure- or temperature-sensitive element or design.When the internal pressure or temperature of the battery cell reaches the specified threshold, the pressure relief component will either take action or destroy the weak structure in the pressure relief component, creating an opening or channel through which the internal pressure or temperature can be released.

[0102] In this application, the term "actuated" means that the pressure relief component generates an action or is activated to a certain state, allowing the internal pressure and temperature of the battery cell to be reduced. The actions generated by the pressure relief component may include, but are not limited to, at least part of the pressure relief component tearing, breaking, rupturing, or opening, and the like. When the pressure relief component is actuated, the internal waste material of the battery cell is vented to the outside from the actuated location. In this way, the battery cell can be depressurized and cooled under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0103] The waste material of the battery cells mentioned herein includes, but is not limited to, electrolyte solution, dissolved or split cathode foil and anode foil, fragments of the separating film, high-temperature and high-pressure gas (such as CH4, CO and other flammable gases) produced by the reaction, flame and the like.

[0104] Current batteries suffer from safety issues during use. Studies have shown that the safety of vehicle power batteries is a critical performance requirement. To achieve longer driving ranges, the energy density of individual cells is constantly increasing. However, high energy density increases the instability of the internal chemical materials, thereby lowering the threshold for thermal runaway (breakdown) of the battery cell. Therefore, the key to ensuring the safety of the entire power battery system and the vehicle lies in preventing heat dissipation after a battery cell thermal runaway occurs.

[0105] In a conventional cylindrical battery, to simplify the battery cell's construction, both the positive and negative output electrodes are located at the same end as the pressure relief component. In the event of thermal runaway in a battery cell, the fluid escaping from the pressure relief component is sprayed into the area where the busbar is located. The busbar connects the positive and negative output electrodes of two battery cells, thus connecting multiple battery cells together. Because the battery pack contains a large number of battery cells connected in series and parallel, the voltage is typically above 100 V. This can lead to large-scale short circuits or high-voltage sparks, which can cause the entire power battery system to catch fire and explode, resulting in vehicle damage, fires, or even personal injury.

[0106] To solve the aforementioned shortcomings, the inventor pursued the idea of ​​placing the pressure relief component as far as possible from the positive and negative output electrodes. This reduces the influence of the discharge material on the busbar under high temperature and high pressure in the event of thermal runaway of the battery cell and prevents thermal runaway of the entire power battery system.

[0107] Based on this improvement approach, the present application provides an improved battery cell. The battery cell comprises a housing and an electrode assembly; the housing is provided with an electrode output section and a pressure relief component, and the electrode output section and the pressure relief component are each arranged at opposite ends of the housing along the first direction; the electrode assembly is arranged in the housing and comprises an electrode body as well as a first tab and a second tab with opposite polarities, the first tab and the second tab are brought out of the electrode body, at least one of the first tab and the second tab is electrically connected to the electrode output section.

[0108] The battery cell of the embodiments of the present application is suitable for the battery and the power-consuming device that uses the battery.

[0109] The power-consuming devices can include, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and power tools, or the like; spacecraft include, for example, airplanes, rockets, spaceships and spacecraft, and so on; electric toys include stationary or mobile electric toys such as game consoles, electric car toys, electric ship toys, electric airplane toys, and so on; power tools include power tools for metal cutting, power tools for grinding, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers.

[0110] As in Fig.As shown in Figure 1, the power-consuming device can be a vehicle 300, for example, a new energy source vehicle, which may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, or the like; alternatively, the power-consuming device could also be a drone, a ship, or the like. The vehicle 300 can comprise a cabin 301 and a vehicle floor panel 302, with the battery 200 arranged between the cabin 301 and the vehicle floor panel 302. The battery 200 can be located on the floor, at the front, or at the rear of the vehicle 300 and serves to supply electrical energy to the motor and other components in the vehicle.

[0111] As in Fig.As shown in Figure 2, battery 200 comprises one battery cell 100. Battery 200 can contain one or more battery cells 100. If multiple battery cells 100 are present, these cells can be connected in series, parallel, or mixed configurations. A mixed configuration means that multiple battery cells 100 contain both series and parallel connections. Multiple battery cells 100 can first be connected in series, parallel, or mixed configurations to form a battery module. Subsequently, these multiple battery modules can again be connected in series, parallel, or mixed configurations to form a whole and housed in a box component 201. Alternatively, all battery cells 100 can be directly connected in series, parallel, or mixed configurations, and the entire assembly of all battery cells 100 can then be housed in the box component 201.

[0112] The battery 200 in Fig.Section 2 also includes a box component 201, the interior of which is hollow and serves to accommodate one or more battery cells 100. Depending on the shape, number, combination, and other requirements of the accommodated battery cells 100, the box component 201 can also have different shapes and sizes. For example, the box component 201 can comprise a box section 201A, a first cover body 201B, and a second cover body 201C, wherein the box section 201A has an opening at each of its opposite ends. The first cover body 201B and the second cover body 201C each serve to close the openings at both ends of the box section 201A. For example, the box section 201A is shown as a rectangular cylindrical structure corresponding to the arrangement of the multiple battery cells 100.To facilitate the maintenance of battery 200, the box component 201 is detachably mounted on the power-consuming device.

[0113] For example, battery cell 100 is circular cylindrical, with its axis running along the first direction z; several battery cells 100 can be arranged in an xoy plane perpendicular to the first direction z; several battery cells 100 can be arranged in a rectangular array along the second direction y and the third direction x, with the second direction y being perpendicular to the third direction x.

[0114] Alternatively, the structural part of the power-consuming device forms a space for receiving the battery cell 100, which serves as the box component 201 in the battery 200. If the battery cell 100 is used, for example, in a vehicle 300, the vehicle frame forms a space for receiving the battery cell 100.

[0115] The battery cell 100 can be, for example, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a magnesium-ion battery, or the like.

[0116] The present application provides a battery cell 100, and subsequent embodiments are described using a circular cylindrical battery cell 100 as an example. Fig. Figure 3 is a schematic representation of the external shape of battery cell 100, Fig. Figure 4 is a schematic sectional view of battery cell 100 and Fig. Figure 5 is a sectional view of battery cell 100.

[0117] In the previously mentioned improved battery cell 100, the electrode output section is defined as an output electrode that protrudes at least partially from the outer wall of the housing 10. To focus the following description on embodiments of the battery cell 100 that deliver electrical energy via the electrode output section and the housing, the two electrodes for delivering electrical energy are, for the sake of simplicity, referred to as the first output electrode and the second output electrode.

[0118] In some embodiments, the battery cell 100 comprises a housing 10, an electrode assembly 4, a first output electrode, and a second output electrode; wherein the electrode assembly 4 comprises an electrode body 41 and a first tab 42 and a second tab 43 of opposite polarity, the first tab 42 and the second tab 43 extending from the electrode body 41; wherein the first output electrode is electrically connected to the first tab 42, and the second output electrode is electrically connected to the second tab 43; wherein the housing 10 is used to accommodate the electrode assembly 4 and the housing 10 is provided with a pressure relief component 21; wherein the first and second output electrodes are located at a first end of the housing in the first direction z, while the pressure relief component 21 is located at the other end of the housing 10.

[0119] The housing 10 can be a thin-walled hollow structure that serves to accommodate the electrode arrangement 4. The housing 10 can be in the form of a circular cylinder, a flat body, a cuboid, or other shapes.

[0120] The first output electrode and the second output electrode serve for the input and output of electrical energy, respectively. The first tab 42 and the first output electrode, as well as the second tab 43 and the second output electrode, can be electrically connected to each other by means of welding, elastic contact or similar methods. The tab and the output electrode can be connected directly or via a current collector.

[0121] The exact structure of the pressure relief component 21 has been described above. Using the circular cylindrical battery cell 100 as an example, the first direction z corresponds to the direction of the central axis of the battery cell 100; the first output electrode and the second output electrode, as well as the pressure relief component 21, are each arranged at opposite ends of the housing 10 along the first direction z.

[0122] The electrode arrangement 4 is, as shown in Fig. 6 and Fig.As shown in Figure 7, arranged in the housing 10, the electrode arrangement 4 consists of a first electrode foil 45 and a second electrode foil 46 with opposite polarities, which are wound around the winding axis K to form a winding structure. The winding axis K coincides with the first direction z, and typically an insulating element 47, for example a separator, is provided between the first electrode foil 45 and the second electrode foil 46. In the case of a circular cylindrical battery cell 100, the wound electrode arrangement 4 can be circular cylindrical; in the case of a cuboid battery cell 100, the wound electrode arrangement 4 can be flat.

[0123] The first electrode foil 45 comprises the first current collector, which in turn comprises a first main body and a first tab 42. The first tab 42 projects outwards from the end face of the first main body along the winding direction K. The side face of the first main body is provided with a first coating layer 45'. This first coating layer 45' can be arranged on both sides of the first main body. For the electrode foil on the innermost or outermost layer, the first coating layer 45' can be provided on only one side of the first main body. The first tab 42 can extend continuously along the longitudinal direction of the first electrode foil 45, thus forming a continuous tab; alternatively, the continuous tab can be punched out to form a toothed tab.For example, the first electrode foil 45 is a cathode foil, and the first current collector may be made of aluminium, the first coating layer 45' may comprise a first active substance layer, such as lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide or the like.

[0124] The second electrode foil 46 comprises a second current collector, which in turn comprises a second main body and a second tab 43. The second tab 43 projects outwards from the end face of the second main body along the winding direction K. The side face of the second main body is provided with a second coating layer 46'. This second coating layer 46' can be arranged on both sides of the second main body. For the electrode foil on the innermost or outermost layer, the second coating layer 46' can be provided on only one side of the second main body. The second tab 43 can extend continuously along the longitudinal direction of the second electrode foil 46, thus forming a continuous tab; alternatively, the continuous tab can be punched out to form a toothed tab.For example, the second electrode foil 46 is the anode foil, the second current collector can be made of copper, and the second coating layer 46' can comprise a second active substance layer, such as graphite or silicon. Alternatively, the first electrode foil 45 can be the anode foil, and the second electrode foil 46 is the cathode foil.

[0125] In the wound electrode arrangement 4, the electrode arrangement 4 comprises an electrode body 41, a first tab 42 and a second tab 43, the first main body of the first electrode foil 45 and the second main body of the second electrode foil 46 form the electrode body 41, wherein the first tab 42 and the second tab 43 are each brought out of the electrode body 41, for example, the first tab 42 and the second tab 43 can be brought out from both ends of the electrode body 41 along the first direction z, or they can be brought out from one end of the electrode body 41 which is aligned along the first direction z to the electrode exit section.

[0126] In this embodiment, the first output electrode and the second output electrode are arranged at one end of the housing 10, while the pressure relief component 21 is arranged at the other end of the housing 10.If a thermal runaway occurs in a battery cell 100, the active substance is ejected from the end where the pressure relief component 21 is located and moves away from the first and second output electrodes of the battery cell 100, thus moving away from the busbar that electrically connects several battery cells 100. This reduces the impact on the electrical connections of the battery cells 100 in the event of a thermal runaway and also prevents large-area short circuits or high-voltage flashovers in the battery 200, thereby preventing a thermal runaway of the entire power battery system or even fires and explosions, thus improving the safety of the power battery system.Secondly, the pressure relief component 21 and the output electrode are provided at both ends of the housing 10, thus creating sufficient space for the pressure relief component 21. This improves the current-carrying capacity of the output electrode, simplifies the machining of the pressure relief component 21, allows for more precise control of its opening pressure, and prevents welding stresses from affecting the opening pressure of the pressure relief component 21 during welding of the busbar. Furthermore, the first and second output electrodes are located at the same end of the housing 10, which facilitates the assembly and connection of the busbar when several battery cells 100 are electrically connected.

[0127] In some embodiments, such as in Fig.As shown in Figure 5, the housing 10 comprises a first end wall 13, a second end wall 14 opposite each other along a first direction z, and a side wall 15 located between the first end wall 13 and the second end wall 14, wherein the first end wall 13 is provided with a first through-hole 12, the electrode output section 3 of the battery cell 10 is mounted in the first through-hole 12 and is provided to be insulated from the first end wall 13, and the second end wall 14 is provided with the pressure relief component 21; wherein the electrode output section 3 is the first output electrode, and the first end wall 13 is the second output electrode.

[0128] For example, the housing 10 is circular cylindrical, and the side wall 15 also has a cylindrical shape with openings at both ends. The first end wall 13 and the second end wall 14 form the two ends of the circular cylinder and serve to close the two ends of the side wall 15. The electrode output section 3 is insulated from the first end wall 13; for example, an insulating element can be provided or an insulating adhesive applied between the electrode output section 3 and the first end wall 13.

[0129] The electrode output section 3 is an output electrode that protrudes from the housing 10, such as an electrode terminal, to enable the electrical connection between different battery cells 100 via the busbar. The electrode terminal can be designed as a pole, which may have a circular cylindrical, square columnar structure, or a columnar structure with other shapes.

[0130] Alternatively, the electrode output section 3 is provided for as the cathode output electrode, and the first end wall 13 serves as the anode output electrode. Since the first tab 42 and the first current collector 5 are made of aluminum, the electrode output section 3 can also be made of aluminum, thus eliminating the need for a composite electrode output section. Alternatively, the electrode output section 3 is the anode output electrode, and the first end wall 13 serves as the cathode output electrode.

[0131] Alternatively, the polarity of the first end wall 13 is the same as that of the electrode foil on the outermost layer of the first electrode foil 45 and the second electrode foil 46. The side wall 15 is connected to the first end wall 13, and their polarities are identical. If metal particles are present between the electrode assembly 4 and the side wall 15, the particles penetrate the insulating element 47 on the outermost ring of the electrode assembly 4 and, after penetrating the insulating element 47, cause a connection between the electrode foil on the outermost layer and the side wall 15. If the polarity of the electrode foil on the outermost layer matches that of the side wall 15, short circuits in the battery cell 100 can be avoided, thereby improving the safety performance of the battery 200.

[0132] In this embodiment, the electrode output section 3 and the first end wall 13 are arranged at the same end of the housing 10, while the pressure relief component 21 is arranged at the other end of the housing 10. If thermal runaway occurs in a battery cell 100, the active substance is ejected from the end where the pressure relief component 21 is located and moves away from the electrode output section 3 and the first end wall 13 of the battery cell 100, thus moving away from the busbar that electrically connects several battery cells 100. This reduces the impact on the electrical connections of the battery cells 100 in the event of thermal runaway.

[0133] Furthermore, by using the electrode output section 3 as the first output electrode of the battery cell 100 and the first end wall 13 as the second output electrode of the battery cell 100, one electrode output section can be eliminated, thereby solving the problem of the difficult arrangement due to the small end area of ​​the battery cell 100 and simplifying the structure of the battery cell 100.

[0134] In some embodiments, such as in Fig. As shown in Figure 5, the housing 10 is provided to include a receiving section 1 and an end cap 2, the receiving section 1 has an opening 11, the opening 11 being closed by the end cap 2, the receiving section 1 is formed by a first end wall 13 and a side wall 15, the end cap 2 is the second end wall 14.

[0135] The end cap 2 and the receiving section 1 are independent components. The end cap 2 can be made of metal material such as steel or alloy. After the electrode assembly 4 is installed, the end cap 2 can be attached to the receiving section 1 by welding, gluing, or joining with a fastener. The end cap 2 must be sealed to the receiving section 1 to prevent gas leakage.

[0136] The first end wall 13 and the side wall 15 can be formed in one piece, which simplifies processing. If thermal runaway occurs in the battery cell 100, causing a pressure increase, the connection between the first end wall 13 and the side wall 15 exhibits high pressure resistance. The pressure is preferably dissipated via the pressure relief component 21 to prevent the connection between the first end wall 13 and the side wall 15 from breaking, thus improving the reliability of the pressure relief. Alternatively, the first end wall 13 and the side wall 15 can be joined into a single piece by welding or another method.

[0137] For example, in a circular cylindrical battery cell 100, the receiving section 1 can be a circular cylindrical structure with an opening 11 at one end, and the end cap 2 is a disc-shaped structure that serves to cover the opening 11; the end of the receiving section 1 facing away from the opening 11 is closed.

[0138] For example, the pressure relief component 21 is formed integrally with the end cap 2; that is, a thickness reduction section is provided on the end cap 2, and the area enclosed by this thickness reduction section forms the pressure relief component 21. For example, the thickness reduction section can be a notch 22, which can be provided on the inner and / or outer wall of the end cap 2. After the pressure relief component 21 is opened, the pressure relief component 21 is destroyed at the thickness reduction section, forming an opening or channel through which the internal pressure or temperature can be relieved.

[0139] An end of the receiving section 1 facing away from the end cap 2 can be provided with a first through-hole 12, the electrode output section 3 can be mounted into the first through-hole 12 from the interior of the receiving section 1, an insulating element 7 is arranged between the electrode output section 3 and the receiving section 1 to achieve insulation between the electrode output section 3 and the receiving section 1, the electrode output section 3 being covered by the cover plate 8.

[0140] In this embodiment, the pressure relief component 21 is arranged on the end cap 2, which is independent of the receiving section 1. This reduces the process difficulties for the arrangement of the pressure relief component 21, facilitates the integral arrangement of the pressure relief component 21 on the end cap 2, and simplifies the control of the dimensional accuracy at the weak point of the pressure relief component 21 during machining in order to improve the opening pressure of the pressure relief component 21, whereby the pressure relief component 21 can be reliably opened if the battery cell 100 experiences a thermal runaway, thereby increasing the safety of the operation of the battery cell 100.

[0141] Since the first output electrode and the second output electrode are also arranged on the first end wall 13, which is integrally formed with the side wall 15, and not on the end cap 2, the tensile force exerted by the busbar on the connection between the end cap 2 and the side wall 15 is reduced, thus preventing fatigue at the connection, thereby reducing the influence of the busbar on the pressure relief component 21 and, to some extent, also reducing damage to the pressure relief component 21 during normal use of the battery cell 100, thus preventing premature pressure relief.

[0142] In some embodiments, the housing 10 comprises a receiving section 1 and an end cap 2, the receiving section 1 has an opening 11, the opening 11 being closed by the end cap 2, the receiving section 1 is formed by a second end wall 14 and a side wall 15, the end cap 2 is the first end wall 13.

[0143] Alternatively, the second end wall 14 and the side wall 15 are formed as a single piece, which simplifies processing. The pressure relief component 21 is provided on the second end wall 14. The connection between the second end wall 14 and the side wall 15 experiences less stress, thereby reducing the tensile stress acting on the pressure relief component 21 and thus ensuring the accuracy of the notch of the pressure relief component 21 is not compromised. If thermal runaway occurs in the battery cell 100, the pressure relief component 21 can precisely control the opening pressure, thereby improving the reliability of the pressure relief during thermal runaway. Alternatively, the second end wall 14 and the side wall 15 can be joined into a single piece by welding or another method.

[0144] In this embodiment, the electrode output section 3 is arranged on an end cap 2 which is independent of the receiving section 1, making it easy to mount the electrode output section 3 on the end cap 2.

[0145] Alternatively, openings 11 are provided at both ends of the receiving section 1, each of which is covered by the end cap 2, the electrode output section 3 and the pressure relief component 21 are each provided at both end caps 2.

[0146] In some embodiments, such as in Fig.As shown in Figure 5, the first tab 42 is extended from the electrode body 41 along the first direction z in the direction of the electrode output section 3, the second tab 43 is extended from the electrode body 41 along the first direction z away from the electrode output section 3, the first tab 42 being electrically connected to the electrode output section 3, and the second tab 43 being electrically connected to the first end wall 13.

[0147] The first tab 42 and the second tab 43 are each extended from both ends of the electrode body 41 along the first direction z, the distance between the first tab 42 and the electrode output section 3 is relatively small, and they can be electrically connected directly or via a current collector, the second tab 43 is located far from the first end wall 13 and the electrical connection can be made via the side wall 15 of the housing 10, in addition it can also be made via a current collector and / or the second end wall 14.

[0148] This embodiment makes it possible to extend the first tab 42 and the second tab 43 from both ends of the electrode body 41, which increases the current carrying capacity and easily ensures the insulation reliability between the first tab 42 and the second tab 43, thereby improving the operational performance of the battery cell 100.

[0149] In some embodiments, the battery cell 100 also comprises a first current collector 5 and a second current collector 6, wherein the first tab 42 is electrically connected to the electrode output section 3 via the first current collector 5, and wherein the second tab 43 is electrically connected to the first end wall 13 via the second current collector 6.

[0150] As in Fig. As shown in Figure 5, the first tab 42 can be attached to the first current collector 5 by welding. After the electrode assembly 4 and the first current collector 5 have been installed together in the receiving section 1, the electrode output section 3 is welded to the first current collector 5 from the outside of the first end cap 13. Optionally, the first tab 42 can be directly connected to the electrode output section 3.

[0151] The second tab 43 is located far from the first end wall 13, and the electrical connection can be made through the side wall 15 of the housing 10. The second tab 43 can either be connected directly to the side wall 15 or the second tab 43 can be electrically connected to the side wall 15 via the second current collector 6. The exact method of implementation will be explained later.

[0152] In this embodiment, the first tab 42 is electrically connected to the electrode output section 3 via the first current collector 5, the second tab 43 is electrically connected to the first end wall 13 via the second current collector 6, which facilitates welding to the tab, improves the reliability of the electrical connection between the first tab 42 and the electrode output section 3, and improves the reliability of the electrical connection between the second tab 43 and the first end wall 13.

[0153] The following shows three implementations of how the second tab 43 can be electrically connected to the side wall 15 via the second current collector 6.

[0154] In a first implementation, the second current collector 6 is in contact with the side wall 15 to establish an electronic conductivity between the second tab 43 and the first end wall 13.

[0155] The electrical energy transmitted by the second tab 43 is passed directly to the side wall 15 of the receiving section 1 via the second current collector 6. The side wall 15 is either integrally formed with the first end cap 13 or electrically connected to it, allowing the electrical energy to be passed to the first end wall 13. The second current collector 6 and the side wall 15 can achieve electrical conductivity through close contact, or the second current collector 6 and the side wall 15 can be welded together.

[0156] This embodiment reduces the number of steps required to transfer electrical energy from the second tab 43 to the first end wall 13, thereby improving the reliability of the electrical energy transfer.

[0157] In the second implementation, the housing 10 comprises a receiving section 1 and an end cap 2, the receiving section 1 has an opening 11, and the end cap 2 serves to close the opening 11, the second current collector 6 is connected to the end cap 2, the end cap 2 being electrically connected to the side wall 15 to achieve electronic conductivity between the second tab 43 and the first end wall 13.

[0158] The second current collector 6 is not in contact with the side wall of the receiving section 1, and the end cap 2 is connected to the second current collector 6. The electrical energy transmitted from the second tab 43 is passed through the second current collector 6 to the end cap 2. The end cap 2 and the side wall 15 can be connected to each other by welding or other means, thereby transferring electrical energy from the end cap 2 to the side wall 15 of the receiving section 1 to establish the electrical connection between the second tab 43 and the first end wall 13. The second current collector 6 and the end cap 2 can achieve electrical conductivity through close contact, or the second current collector 6 and the end cap 2 can be welded together on the side of the end cap 2 facing away from the electrode arrangement 4.

[0159] Alternatively, the end cap 2 and the second current collector 6 can be joined by welding. To allow gas to flow through the second current collector 6 and act on the pressure relief component 21 in the event of thermal runaway of the battery cell 100, the end cap 2 and the second current collector 6 are positioned at a preset distance in the first direction z. To achieve a weld between the end cap 2 and the second current collector 6, as shown in Fig.As shown in Figure 5, the end cap 2 has a recess 23 that projects integrally towards the electrode arrangement 4. The recess 23 abuts the second current collector 6 and is located radially outside the pressure relief component 21. The recess 23 can be welded to the second current collector 6 from the outside of the end cap 2. For example, the recess 23 can be designed as an integral ring structure arranged coaxially on the outside of the pressure relief component 21 to achieve a larger weld area and improve the reliability of the electrical connection; alternatively, at least one recess 23 can be provided along the circumferential direction on the outer circumference of the pressure relief component 21.

[0160] Alternatively, the pressure relief component 21 can be recessed by a predetermined distance towards the inner surface of the outermost wall surface of the end cap 2, thereby preventing the battery cell 100 from exerting an additional force on the pressure relief component 21 when positioned with the end cap 2 facing downwards, in order to protect the pressure relief component 21.

[0161] In this embodiment, the second tab 43 is electrically connected to the end cap 2. If the electrical connection is made, for example, by welding, the end cap 2 has a flatter welding surface, which facilitates welding and leads to a better welding effect, thereby improving the reliability of the electrical connection between the second tab 43 and the first end cap 13.

[0162] In the third implementation, the housing 10 comprises a receiving section 1 and an end cap 2, the receiving section 1 has an opening 11, and the end cap 2 serves to close the opening 11, the second current collector 6 is in contact with the side wall 15, and the end cap 2 is connected to the second current collector 6 to achieve electronic conductivity between the second tab 43 and the first end wall 13.

[0163] The second current collector 6 is in contact with the side wall 15 of the receiving section 1 and is also electrically connected to the end cap 2; the electrical energy transmitted by the second tab 43 can be simultaneously transferred to the first end cap 13 via the two conductive paths mentioned above.

[0164] This embodiment allows the electrical energy transmitted from the second tab 43 to be conducted to the first end cap 13 via the two conductive paths. If a loose connection occurs in one of the conductive paths, the electrical energy can still be transmitted via the other conductive path, thus improving the reliability of the energy transmission.

[0165] In some embodiments, the housing 10 includes a second end wall 14, and the pressure relief component 21 is located in the central area of ​​the second end wall 14.

[0166] The center of the electrode arrangement 4 is provided with a second through-hole 44 extending in the first direction z. In the event of a thermal runaway of a battery cell 100, most of the high-temperature, high-pressure gas flow contained therein can reach the pressure relief component 21 through the second through-hole 44 and effectively act upon this pressure relief component 21, allowing the pressure relief component 21 to open reliably.

[0167] In this embodiment, the pressure relief component 21 is arranged in the central region of the end cap 2. In the event of thermal runaway of a battery cell 100, the high-temperature, high-pressure gas flow contained therein has a relatively short gas flow path, regardless of the direction from which it strikes the pressure relief component 21. This ensures that the pressure relief component 21 opens in time, thereby improving the reliability and safety of the battery cell 100.

[0168] In some embodiments, such as in Fig.As shown in Figures 8A to 8E, the second flow collector 6 is located between the pressure relief component 21 and the second tab 43 in the first direction z, wherein the second flow collector 6 is provided with a recess section 6', the recess section 6' being used to allow the gas flow between the space on one side of the second flow collector 6 facing the second tab 43 and the space on the other side facing the pressure relief component 21.

[0169] The intended shape and size of the recess section 6' must not only meet the strength requirements of the second current collector 6 but also allow the internal gas to quickly and smoothly reach the pressure relief component 21 in the event of a thermal runaway of the battery cell 100. The center of the electrode assembly 4 is provided with a second through-hole 44 extending in the first direction z. In the event of a thermal runaway of a battery cell 100, most of the high-temperature, high-pressure gas flow inside can flow through the second through-hole 44 and reach the pressure relief component 21 via the recess section 6', allowing the pressure relief component 21 to open reliably.

[0170] In this embodiment, the electrode outlet section and the pressure relief component 21 are located at opposite ends of the housing 10. The provision of the recess section 6' on the second current collector 6 allows high-temperature, high-pressure gas to pass unhindered through the recess section 6' to the pressure relief component 21 in the event of thermal runaway in any area within the battery cell 100. This allows the gas to be discharged to the outside via the pressure relief component 21 in a timely manner, thereby improving the safety of the battery cell 100 in the event of thermal runaway.

[0171] In some embodiments, such as in Fig.As shown in Figures 8A to 8E, the recess section 6' is designed to include at least one fourth through-hole 61, with this fourth through-hole 61 being located in the central position of the second current collector 6. For example, the fourth through-hole 61 may be a round hole, an elliptical hole, a polygonal hole, or the like.

[0172] Normally, the gas in the electrode assembly 4 is discharged to the outside of the electrode assembly 4 via the tab side. By providing a fourth through-hole 61 in the center of the second current collector 6, the gas exiting from each area of ​​the second tab 43 can reach the fourth through-hole 61 relatively quickly and thus smoothly reach the pressure relief component 21.

[0173] In some embodiments, such as in Fig.As shown in Figure 8C, it is provided that several fourth through-holes 61 are provided and the remaining fourth through-holes 61 are distributed around the fourth through-hole 61 in the central position. For example, the remaining fourth through-holes 61 can be evenly distributed around the fourth through-hole 61 in the central position, or the remaining fourth through-holes 61 can be distributed in the area where the second tab 43 is provided.

[0174] This embodiment can usefully increase the exhaust gas area and, to a certain extent, solve the problem of premature exhaust gas release due to blockages in the central position of the second current collector 6.

[0175] In some embodiments, such as in Fig. 8B and Fig.As shown in Figure 8E, the recess section 6' is also provided to include several incisions 63, wherein the incisions 63 penetrate the second current collector 6 along the first direction z, and the several incisions 63 surround the fourth through-hole 61. For example, the incisions 63 have an elongated shape with a certain width, and the incisions 63 can extend in a straight line, for example in the radial direction of the circular second current collector 6; alternatively, the incisions 63 can extend along a curve, for example along the circumferential direction of the circular second current collector 6.

[0176] In this embodiment, several incisions 63 are provided at the base of the fourth through-hole 61 to facilitate venting of the fourth through-hole 61. In the event of thermal runaway of a battery cell 100, the gas flow can simultaneously reach the pressure relief component 21 through the fourth through-hole 61 and several incisions 63. Furthermore, the incisions 63 have an elongated shape, which reduces the weakening of the strength of the second current collector 6 during simultaneous venting and also facilitates machining.

[0177] In some embodiments, it is provided that one end of the cut 63 is connected to the fourth through hole 61 and extends away from the fourth through hole 61.

[0178] For example, the second current collector 6 is circular, one end of the cut 63 is connected to the fourth through-hole 61 and extends radially away from the fourth through-hole 61 in the direction of the second current collector 6; the multiple cuts 63 can be arranged evenly along the circumference. Alternatively, one end of the cut 63 is not connected to the fourth through-hole 61 and has a preset distance.

[0179] This embodiment enables reliable blow-off from the central position of the second current collector 6 to the area at the outer circumference. In the event of thermal runaway of a battery cell 100, the gas flow can flow more uniformly and quickly to the pressure relief component 21.

[0180] In some embodiments, such as in Fig. 8A and Fig.As shown in 8D, the recess section 6' is also provided to include an engraving line 62, wherein the engraving line 62 runs through the second current collector 6 along the first direction z.

[0181] The engraving line 62, for example, is linear, and theoretically there should be no gap in the same plane between the two side walls forming the engraving line 62. In practice, however, a tiny gap may exist. Under gas pressure, the second current collector 6 can deform at the engraving line 62, creating a gap between the two side walls of the engraving line 62. The engraving line 62 can be continuous or segmented, thus forming a dotted line. The engraving line 62 can extend along a straight line, for example, along the radial direction of the circular second current collector 6; alternatively, the engraving line 62 can extend along a curve, for example, along the circumferential direction of the circular second current collector 6.

[0182] In this embodiment, several engraving lines 62 are provided at the base of the fourth through-hole 61 to facilitate venting of the fourth through-hole 61. In the event of thermal runaway of a battery cell 100, the gas flow can simultaneously reach the pressure relief component 21 through the fourth through-hole 61 and several engraving lines 62. Furthermore, the engraving lines 62 can minimize the weakening of the strength of the second current collector 6 while simultaneously facilitating venting.

[0183] In some embodiments, it is provided that several engraving lines 62 are provided, wherein one end of the engraving line 62 is connected to the fourth through hole 61 and extends away from the fourth through hole 61.

[0184] For example, the second current collector 6 is circular, one end of the engraving line 62 is connected to the fourth through-hole 61 and extends radially away from the fourth through-hole 61 in the direction of the second current collector 6; the multiple engraving lines 62 can be arranged evenly along the circumference. Alternatively, one end of the cut 63 is not connected to the fourth through-hole 61 and has a preset distance.

[0185] This embodiment enables reliable blow-off from the central position of the second current collector 6 to the area at the outer circumference. In the event of thermal runaway of a battery cell 100, the gas flow can flow more uniformly and quickly to the pressure relief component 21.

[0186] The recess section 6' on the second current collector 6 in Fig. 8A to 8E are each described below.

[0187] As in Fig.As shown in Figure 8A, the recess section 6' can include a fourth through-hole 61 and an engraving line 62 provided on the second current collector 6. For example, the second current collector 6 can be circular, the fourth through-hole 61 can be located in the center of the second current collector 6, the engraving line 62 passes through the second current collector 6, one end of the engraving line 62 is connected to the fourth through-hole 61, and the other end extends radially outward. For example, the engraving line 62 can be continuous or intermittent, and several engraving lines 62 can be arranged in a radial pattern. For example, four engraving lines 62 can be arranged to form a cross shape.

[0188] This embodiment enables reliable blowing from the central position of the second current collector 6 to the area on the outer circumference, minimizes the weakening of the strength of the second current collector 6 by the arrangement of the recess section 6' and the straight engraving line 62 facilitates processing.

[0189] As in Fig. As shown in Figure 8B, the recess section 6' can include a fourth through-hole 61 and a notch 63 provided on the second current collector 6. For example, the second current collector 6 can be circular, the fourth through-hole 61 can be located in the center of the second current collector 6, and the notch 63 can penetrate the second current collector 6 and extend radially. Several notches 63 can be provided and arranged radially; for example, four notches 63 can be provided so that they form a cross shape.

[0190] This embodiment enables reliable blowing from the central position of the second current collector 6 to the area at the outer circumference, thereby reducing the weakening of the strength of the second current collector 6 during simultaneous blowing, and the straight cut 63 is also easy to machine.

[0191] As in Fig.As shown in Figure 8C, the recess section 6' can include at least one fourth through-hole 61 in the second current collector 6; for example, a single fourth through-hole 61 can be provided; in the case of a circular second current collector 6, the fourth through-hole 61 can be provided in the central position of the second current collector 6; alternatively, several fourth through-holes 61 can be provided; for example, a fourth through-hole 61 can be located in the central position of the second current collector 6, and the remaining fourth through-holes 61 can be distributed around the central fourth through-hole 61.

[0192] This embodiment can usefully increase the exhaust gas area and to some extent solve the problem of premature exhaust gas release due to blockages in the central position of the second current collector 6, and this recessed section 6' is easy to machine.

[0193] As in Fig. When displayed in 8D, the difference to Fig. 8A in that the engraving line 62 is curved, for example, the engraving line 62 is arc-shaped or circular. The engraving line 62 can be arranged concentrically to the fourth through-hole 61. This embodiment allows for a better blow-out effect in the circumferential direction of the second current collector 6.

[0194] As in Fig. As shown in 8E, the difference to Fig.8B in that the incision 63 is curved, for example, the incision 63 is arcuate or circular, and the incision 63 can be arranged concentrically to the fourth through-hole 61. For example, the incision 63 can be arranged continuously, or the incision 63 can be made in several segments, the several segments of the incision 63 being arranged at intervals around the outer circumference of the fourth through-hole 61. This embodiment allows for a better blow-out effect in the circumferential direction of the second current collector 6, and the incision 63 is easy to machine.

[0195] In some embodiments, the first tab 42 and the second tab 43 are each led out from an end of the electrode body 41 facing the electrode output section 3 along the first direction z, wherein the first tab 42 is electrically connected to the electrode output section 3, and wherein the second tab 43 is electrically connected to the first end wall 13.

[0196] The first tab 42 and the second tab 43 are brought out from the same end of the electrode body 41 along the first direction z, the distance between the first tab 42 and the electrode output section 3 as well as the distance between the second tab 43 and the first end wall 13 are both relatively small, and they can be electrically connected directly or via a current collector.

[0197] This embodiment allows both the first tab 42 and the second tab 43 to extend from the end of the electrode body 41 facing the electrode output section 3, thus enabling an electrical connection, and the first tab 42 and the second tab 43 only require space on one side of the electrode body 41, thereby reducing the height of the battery cell 100 and improving the energy density of the battery cell 100.

[0198] In some embodiments, the battery cell 100 further comprises a first current collector 5 and a second current collector 6, wherein the first tab 42 is electrically connected to the electrode output section 3 via the first current collector 5, and wherein the second tab 43 is electrically connected to the first end wall 13 via the second current collector 6; wherein the electrode output section 3 comprises a base 31 and a main body 32, the base 31 being located between the first end wall 13 and the first current collector 5 and being used to prevent the movement of the electrode output section 3 in the first direction z away from the interior of the housing 10, wherein an insulating element 7 is provided between the first end wall 13 and the base 31, and wherein at least a part of the main body 32 is located within the first through-hole 12.

[0199] The outer diameter of the base 31 is larger than that of the first through-hole 12. The base 31 serves for electrical connection with the first current collector 5. A gap is located between the base 31 and the first end wall 13. At least a portion of the main body 32 is located within the first through-hole 12, and a gap exists between the main body 32 and the inner wall of the first through-hole 12. For example, the electrode output section 3 is entirely stepped circular cylindrical, and the main body 32 is inserted into the first through-hole 12. The diameter of the main body 32 is smaller than the inner diameter of the first through-hole 12 to accommodate the insulating element 7.

[0200] The insulating element 7 can be C-shaped. The side wall of the first through-hole 12 is partially embedded in the opening of the C-shaped insulating element 7, such that the insulating element 7 encloses the inner side wall of the first through-hole 12 and the area where the inner and outer surfaces of the first end wall 13 abut the first through-hole 12. The portion of the insulating element 7 located at the first end wall 13 and facing the first current collector 5 rests against the inner surface of the first end wall 13.

[0201] The electrode output section 3 of this embodiment can be prevented from slipping out of the first through-hole 12 by the positioning of the base 31, thereby improving the reliability of the electrical connection between the electrode output section 3 and the first current collector 5; the insulation between the electrode output section 3 and the first end wall 13 can also be achieved by the insulating element 7.

[0202] In some embodiments, such as in Fig. As shown in Figure 9, it is provided that the maximum thickness t1 of the base 31 of the electrode output section 3 is in the size range of 0.6 mm ≤ t1 ≤ 1.2 mm; and / or the maximum thickness t2 of the first current collector 5 is in the size range of 0.3 mm ≤ t2 ≤ 0.7 mm; and / or the maximum thickness t3 of the second current collector 6 is in the size range of 0.3 mm ≤ t3 ≤ 0.7 mm.

[0203] For better effects, use 0.8 mm ≤ t1 ≤ 1 mm, 0.4 mm ≤ t2 ≤ 0.6 mm and / or 0.4 mm ≤ t3 ≤ 0.6 mm.

[0204] For example, the maximum thickness t1 of the base 31 can be greater than the maximum thickness t2 of the first current collector 5 or the maximum thickness t3 of the second current collector 6 to prevent gas flow from escaping through the mounting position of the electrode output section 3 in the event of thermal runaway of the battery cell 100.

[0205] By specifying suitable thicknesses for the base 31 of the electrode output section 3, the first current collector 5 and the second current collector 6, this embodiment ensures that in the event of thermal runaway of the battery cell 100, the gas is discharged via the pressure relief component 21, thus preventing the gas from escaping from the side on which the electrode output section 3 and the first end wall 13 are provided, thereby improving the safety of the battery cell 100 in operation.

[0206] In some embodiments, the electrode output section 3 also includes a limiting projection 33; both the base 31 and the limiting projection 33 are connected to and project from the outer circumferential wall of the main body 32; the limiting projection 33 and the base 31 are located on the outside and inside of the first end wall 13, respectively, along the first direction z and serve to clamp a part of the first end wall 13.

[0207] The base 31 and the limiting projection 33 are both connected to the outer circumferential wall of the main body 32. A gap is also located between the limiting projection 33 and the outer surface of the first end wall 13, which serves to accommodate an insulating element 7 between the limiting projection 33 and the first end wall 13. For example, the electrode output section 3 is overall stepped circular cylindrical. The diameters of the base 31 and the limiting projection 33 are each larger than the diameter of the main body 32, the diameter of the limiting projection 33 is smaller than the diameter of the base 31, and the diameter of the main body 32 is smaller than the inner diameter of the first through-hole 12.

[0208] A groove is formed on the outer side wall of the electrode output section 3 between the base 31, the main body 32 and the limiting projection 33. The insulating element 7 can be C-shaped and is embedded in the groove, and the opening of the C-shaped insulating element 7 corresponds to the opening direction of the groove. The side wall of the first through-hole 12 is partially embedded in the opening of the C-shaped insulating element 7, such that the first extension of the insulating element 7 is located between the first end wall 13 and the base 31, and the first extension projects beyond the base 31. The second extension is located between the first end wall 13 and the limiting projection 33, and the second extension projects beyond the limiting projection 33. The side wall connecting the first extension to the second extension is partially located between the inner wall of the first through-hole 12 and the main body 32.The outer ends of the two extensions of the insulating element 7 each ensure that the insulating element 7 provides reliable insulation between the electrode output section 3 and the first end wall 13 and prevents high-pressure gas from escaping from the gap between the first end wall 13 and the electrode output section 3 in the event of thermal runaway.

[0209] In this embodiment, the limiting projection 33 and the base 31 are used to clamp a part of the first end wall 13, which allows the electrode output section 3 to be installed more stably and reliably on the first end wall 13.

[0210] In some embodiments, the main body 32 is provided with a recess 34, the bottom wall of the recess 34 is connected to the first current collector 5 to establish electronic conductivity between the electrode output section 3 and the first tab 42, and the opening of the recess 34 is provided on a side of the main body 32 facing the interior of the housing 10 and / or away from it.

[0211] As in Fig.As shown in Figure 5, the opening of the recess 34 is provided on the side of the main body 32 facing away from the interior of the housing 10, thereby the bottom wall of the recess 34 is closer to the first current collector 5, which facilitates the electrical connection between the two; the first current collector 5 can be designed as a flat plate construction to reduce the processing difficulty. The recess 34 is stepped and comprises a first recess 341 and a second recess 342. The second recess 342 is provided on the bottom wall of the first recess 341. The inner diameter of the second recess 342 is smaller than the inner diameter of the first recess 341. The bottom wall of the second recess 342 is provided with a third through-hole 343 for injecting electrolyte solution into the housing 10. The cover plate 8 is embedded in the first groove 341 to close the opening of the recess 34 and thus the third through-hole 343.

[0212] This embodiment reduces the thickness of the electrical connection area between the main body 32 and the first current collector 5 by arranging the recess 34 on the main body 32, thereby improving the reliability of the electrical connection between the main body 32 and the first current collector 5.

[0213] In some embodiments, it is provided that the bottom wall of the recess 34 is laser-welded to the first current collector 5 from a side of the main body 32 facing away from the interior of the housing 10.

[0214] This embodiment reduces the thickness of the welding area between the main body 32 and the first current collector 5 by providing the recess 34, and the main body 32 and the first current collector 5 can be easily welded from the outside of the electrode output section 3, which improves the reliability of the weld; in addition, the metal ions generated during welding do not enter the housing 10, which can improve the reliability of the battery cell 100.

[0215] In some embodiments, such as in Fig. As shown in Figure 9, the housing 10 is circular cylindrical, and the pressure relief component 21 is arranged in the central position on the second end wall 14 and is circular. The pressure relief component 21 has a pressure relief area, the diameter φ1 of the pressure relief area and the diameter φ of the housing 10 are related by... 0.35≤∅1∅≤0.85 fulfill.

[0216] The pressure relief component 21 is formed by providing a thickness reduction section, for example a notch 22. The area enclosed by the notch 22 forms the pressure relief area. For ease of measurement, the diameter φ1 of the pressure relief area can be represented by the diameter of the circle enclosed by the inner side wall of the notch 22. In one structural form, the pressure relief component 21 is formed integrally with the second end wall 14.The notch 22 is directly incorporated into the second end wall 14; in another structural form, the pressure relief component 21 is an independent part whose outer side wall is welded to the second end wall 14, the diameter of the outer side wall of the pressure relief component 21 is larger than the maximum diameter of the notch 22, the diameter of the pressure relief area at this point still corresponds to the diameter of the circle enclosed by the inner side wall of the notch 22.

[0217] If φ1 < 0.35*φ, the opening area of ​​the pressure relief region of the pressure relief component 21 is not sufficiently large in the event of thermal runaway near the electrode output section 3 in the battery cell 100, and the rate at which heat is dissipated from the battery cell 100 is too low, which may damage the electrode output section 3 or the housing 10, or even lead to a heat leak; if φ1 > 0.85 * φ, the pressure relief region of the pressure relief component 21 occupies a large part of the area on the second end wall 14, which makes the strength of the second end wall 14 insufficient, the gas pressure generated during the use of the battery cell 100 due to internal gas formation leads to the opening of the pressure relief component 21, and problems such as fluid leakage and abnormal electrical connections may occur.

[0218] The following explains, with reference to Table 1, the influence of the design of the diameter of the pressure relief component 21 on the safety of the battery cell 100; the units of the dimensional parameters given in the following table are all in mm.

[0219] Table 1. Influence of the design of the diameter of the pressure relief area of ​​the pressure relief component 21 on the safety of the battery cell 100 Φ φ1 φ1 / φ 0.35* φ 0.85* φ If the needle fails to penetrate the electrical connection on the side facing the electrical connection, will the electrical connection side be damaged? Will there be any fluid leakage during battery use? Example 1 45 15 0,33 15,8 38,3 Yes No Example 2 45 20 0,44 15,8 38,3 No No Example 3 45 25 0,56 15,8 38,3 No No Example 4 45 30 0,67 15,8 38,3 No No Example 5 45 35 0,78 15,8 38,3 No No Example 6 45 40 0,89 15,8 38,3 No Yes

[0220] In Table 1, for embodiment 1, the following applies: ∅1∅<0.35, The pressure relief area of ​​the pressure relief component 21 has a relatively small surface area compared to the end of the housing 10. During the puncture test on the side where the electrode output section 3 and the first end wall 13 are located, a short circuit of the battery cell 100 occurs. In the event of internal thermal runaway, the weak point formed by the pressure relief component 21 is relatively small; for example, the notch is short, which increases the difficulty of opening it. Even if the pressure relief component 21 is opened, the high-temperature and high-pressure gas slowly escapes from the pressure relief component 21. The brief period of high pressure causes the gas to escape to the side of the electrode output section, thereby breaking this section and thus interrupting the electrical connection of the battery cell 100.However, since the area of ​​the pressure relief region of the pressure relief component 21 is small, the strength of the end cap 2 on which the pressure relief component 21 is provided can be ensured, and fluid leakage during use is unlikely. In each table, the side on which the electrode output section 3 and the first end wall 13 are located is referred to as the "electrical connection side".

[0221] For embodiments 2 to 5, the following applies: 0.35<∅1∅<0.85, The pressure relief area of ​​the pressure relief component 21 has a relatively large surface area compared to the end of the housing 10. During the puncture test near the side where the electrode output section 3 and the first end wall 13 are located, a short circuit of the battery cell 100 occurs. In the event of internal thermal runaway, the weak point formed by the pressure relief component 21 is relatively large; for example, the notch is long, which reduces the difficulty of opening it. When the pressure relief component 21 is activated, the high-temperature and high-pressure gas can be quickly discharged from the pressure relief component 21, preventing the gas from escaping on the side facing the electrode output section 3. This prevents damage to the electrode output section 3 and ensures an effective electrical connection of the battery cell 100.However, the large surface area of ​​the pressure relief component 21 in embodiment 6 reduced the strength of the end cap 2 on which the pressure relief component 21 is provided, leading to fluid leakage during use.

[0222] In this embodiment, providing a specific ratio between the diameter of the pressure relief area of ​​the pressure relief component 21 and the diameter of the housing 10 ensures two things: firstly, that in the event of thermal runaway of the battery cell 100, the pressure relief component 21 has a sufficient opening area, allowing heat to be quickly dissipated from the battery cell 100 to prevent damage to the electrode outlet section or the housing 10, or even heat leakage; and secondly, ensuring the reliable opening of the pressure relief component 21 improves the strength of the end of the housing 10 where the pressure relief component 21 is located, preventing the internal gas pressure of the battery cell 100 from opening the pressure relief component 21 during normal operation and causing fluid leakage or electrical connection problems.

[0223] In some embodiments, the housing 10 is circular cylindrical and has a diameter of φ, where 15 mm ≤ φ ≤ 70 mm.

[0224] To achieve better results, the diameter (φ) can be chosen between 30 mm and 55 mm. With a diameter (φ) < 15 mm and a diameter (φ) > 70 mm, the battery 200 will not have a sufficient state of charge. If the diameter of the casing 10 is too small, the energy density of the battery cell 100 will be relatively low, and a significant amount of space will be wasted when the battery cells 100 are grouped together, for example, in the case of circular cylindrical battery cells 100, resulting in the battery 200 having an insufficient state of charge. If the diameter of the casing 10 is too large, the energy density of the battery cell 100 will increase, but this may not be sufficient to accommodate an additional row of battery cells 100 if there is still a lot of space inside the battery 200. Since there are many battery cells 100 in each row, a significant amount of power will be lost in the battery 200.

[0225] The following table explains the influence of the design of h and φ on the overall state of charge of battery 200, where both h and φ have the unit mm, and the unit of the overall state of charge is kWh.

[0226] Table 2. Influence of the design of h and φ on the overall state of charge of the battery 200 h Φ Total charge level (kWh) Example 1 80 18 68,5 Example 2 80 21 70,4 Example 3 80 24 70,8 Example 4 80 27 70,5 Example 5 80 30 71,8 Example 6 80 33 73,8 Example 7 80 36 77,8 Example 8 80 39 77,1 Example 9 80 42 76 Example 10 80 45 79,6 Example 11 80 48 72,1 Example 12 80 51 78,7 Example 13 80 54 62,4 Example 14 80 57 70,4 Example 15 80 60 56,6

[0227] This embodiment ensures that the battery 200 has a sufficient state of charge to meet the power requirements, and the battery cells 100 with a suitable diameter can be selected according to the interior space of the box component 201 in order to maximize the space utilization within the box component 201 and minimize wasted interior space. This maximizes the overall state of charge and increases the energy density of the battery 200 while keeping its volume constant.

[0228] In some embodiments, such as in Fig. As shown in Figure 9, the electrode output section 3 is provided at the first end wall 13 of the housing 10, and the pressure relief component 21 is provided at the second end wall 14 of the housing 10, wherein the thickness l1 of the first end wall 13 and the thickness l2 of the second end wall 14 satisfy the relationship l1 ≥ l2.

[0229] The housing 10 can comprise a receiving section 1 and an end cap 2. The end cap 2 closes the opening 11 of the receiving section 1. A pressure relief component 21 is provided on the end cap 2. The end cap 2 serves as the second end wall 14. The thickness l2 of the second end wall 14 corresponds to the thickness of the end cap 2. This thickness does not correspond to the thickness at the location of the notch 22. The first end wall 13 of the housing 10 is the end wall of the receiving section 1 facing away from the opening 11, i.e., the end wall of the receiving section 1 on which the electrode output section 3 is provided. The thickness l1 of the first end wall 13 and the thickness l2 of the second end wall 14 each correspond to the thickness of most of the end wall.Since protrusions or grooves may be locally provided on the first end wall 13 or the second end wall 14, which have only a minor influence on the strength of the end wall body, the thickness of the end wall is expressed by the thickness of the end wall body area to simplify the measurement.

[0230] To achieve better effects, l1 ≥ 1.5 * l2 applies. If l1 < l2, and thermal runaway occurs in battery cell 100, the deformation of the casing 10 on the side of the pressure relief component 21 is less than the deformation on the side where the electrode output section 3 and the first end wall 13 are located, and it is susceptible to damage during thermal runaway and thermal leakage.

[0231] In this embodiment, the thickness l1 of the first end wall 13 is greater than the thickness l2 of the second end wall 14, so that in the event of thermal runaway within the battery cell 100, the deformation of the housing 10 on the side of the pressure relief component 21 is greater than the deformation of the side on which the electrode output section 3 and the first end wall 13 are located. The gas generated by thermal runaway is reliably discharged via the pressure relief component 21 at the second end wall 14, thereby preventing the gas from flowing towards the side on which the electrode output section 3 is located and preventing severe deformation of the first end wall 13, thus preventing the housing 10 from breaking and releasing heat in the event of thermal runaway.

[0232] In some embodiments, the thickness l1 of the first end wall 13 is in the range of 0.5 mm ≤ l1 ≤ 1 mm; and / or the thickness l2 of the second end wall 14 is in the range of 0.3 mm ≤ l2 ≤ 1 mm.

[0233] To achieve better effects, 0.6 mm ≤ l1 ≤ 0.8 mm and 0.5 mm ≤ l2 ≤ 0.8 mm apply.

[0234] In this embodiment, suitable thicknesses are designed for the first end wall 13 and the second end wall 14, so that the housing 10 deforms significantly in the event of thermal runaway of the battery cell 100 under the influence of the internal high-pressure gas, in order to prevent the housing 10 from breaking and heat from escaping in the event of thermal runaway.

[0235] In some embodiments, such as in the Fig. 9 and Fig.As shown in Figure 10, the second end wall 14 is provided with a notch 22, wherein the area of ​​the second end wall 14 enclosed by the notch 22 forms the pressure relief component 21.

[0236] The notch 22 can enclose a circle, an oval or a polygon or the like, and the extension path of the notch 22 can be closed or not.

[0237] In this embodiment, in the event of thermal runaway of a battery cell 100, if the internal pressure exceeds the preset opening pressure of the pressure relief component 21, the notch 22 can break to open the pressure relief component 21, and the gas flow inside the housing 10 can escape to the outside through the opening, thus improving the safety of the battery cell 100 during operation.

[0238] In some embodiments, it is provided that the thickness l1 of the first end wall 13 and the thickness l3 at the position of the second end wall 14 provided with the notch 22 satisfy the relationship l1≥2*l3.

[0239] To achieve better effects, l1 ≥ 6*l3.

[0240] The thickness l3 at the point of the second end wall 14 provided with the notch 22 is the distance between the lowest point of the notch 22 and the surface of the second end wall 14 facing away from the notch 22.

[0241] In this embodiment, by providing the dimensional relationship between the thickness l1 of the first end wall 13 and the thickness l3 at the location of the notch 22 on the second end wall 14, a weak point with lower strength compared to the first end wall 13 is formed at the location of the notch 22.In the event of thermal runaway of a battery cell 100, the internal gas can preferably deform at the weak point, causing the pressure relief component 21 to open rapidly and thus allowing the internal gas to be discharged uniformly; even if thermal runaway occurs on the side near the electrode outlet section, the gas can preferably move towards the pressure relief component 21, thereby preventing the area where the first end wall 13 is located from undergoing greater deformation under the influence of the internal high-pressure gas, thus preventing the casing 10 from breaking and releasing heat in the event of thermal runaway, and improving the safety of the battery cell 100 on the side where the electrode outlet section 3 and the first end wall 13 are located.

[0242] In some embodiments, it is provided that the thickness l1 of the first end wall 13 and the thickness l3 at the position of the second end wall 14 provided with the notch 22 must satisfy the relationship l1 ≥ 6 * l3 in order to achieve better effects.

[0243] Table 3. Influence of the ratio of thickness 11 to thickness 13 on the safety of battery cell 100 l1 l3 6*l3 If the needle fails to penetrate the electrical connection on one side, will the electrical connection side be damaged? Example 1 0,7 0,1 0,6 No Example 2 0,6 0,1 0,6 No Example 3 0,5 0,1 0,6 Yes Example 4 0,25 0,05 0,3 Yes Example 5 0,3 0,05 0,3 No Example 6 0,35 0,05 0,3 No

[0244] In Table 3, for embodiments 3 and 4, the condition l1 < 6 * l3 applies, and during the puncture test, a short circuit of the battery cell 100 occurs on a side facing the electrode output section 3 and the first end wall 13. If an internal thermal runaway occurs, the high-temperature and high-pressure gas can more easily flow to the first end wall 13 due to its reduced thickness, causing the first end wall 13 to deform or be damaged. The briefly occurring high pressure causes the gas to escape to the side of the electrode output section 3, thereby breaking this electrode output section 3 and thus interrupting the electrical connection of the battery cell 100.

[0245] In some embodiments, the electrode output section 3 is arranged on the first end wall 13 of the housing 10, the first end wall 13 is provided with a first through-hole 12 for mounting the electrode output section 3, and the pressure relief component 21 is circular and has a pressure relief area, wherein the diameter φ2 of the first through-hole 12 and the diameter φ1 of the pressure relief area satisfy the relationship φ2≤φ1.

[0246] If φ2 > φ1, and thermal runaway occurs within battery cell 100, the deformation on the side of the pressure relief component 21 is less than the deformation on the side of the first end wall 13, and the mounting area of ​​the electrode output section 3 is susceptible to damage and thermal leakage. For better results, φ2 ≤ 0.8 * φ1.

[0247] In this embodiment, the diameter φ2 of the first through-hole 12, used for installing the electrode outlet section 3, does not exceed the diameter φ1 of the pressure relief area. This improves the strength of the housing 10 at the first end wall 13 where the electrode outlet section 3 is located. If the battery cell 100 experiences thermal runaway, the gas can preferentially flow towards the pressure relief component 21. This prevents the area where the first end wall 13 is located from undergoing significant deformation under the influence of the internal high-pressure gas, thus preventing the housing 10 from fracturing during thermal runaway and causing thermal leakage. This also improves the safety of the battery cell 100 on the side where the electrode outlet section 3 and the first end wall 13 are located.

[0248] In some embodiments, the diameter φ2 of the first through-hole 12 is in the size range of 8 mm ≤ φ2 ≤ 25 mm; and / or the diameter φ1 of the pressure relief area is in the size range of 20 mm ≤ φ1 ≤ 35 mm.

[0249] To achieve better effects, 10 mm ≤ φ2 ≤ 20 mm, 22 mm ≤ φ1 ≤ 32 mm.

[0250] The first through-hole 12 serves for mounting the electrode output section 3. If the first through-hole 12 is too small, this limits the diameter of the electrode output section 3 and impairs the current-carrying capacity of the battery cell 100; if the size of the first through-hole 12 is too large, the overall strength of the first end wall 13 of the receiving section 1, facing away from the end cap 2, is reduced; in the event of thermal runaway of a battery cell, the connection between the first through-hole 12 and the electrode output section 3 can deform, and the gas escaping from this weak point can compromise the safety of the side on which the electrode output section 3 and the first end wall 13 are located.

[0251] By designing suitable dimensions for the first through-hole 12 and the diameter φ1 of the pressure relief area, the strength of the end of the housing 10 where the electrode outlet section 3 is located can be ensured in this embodiment. In the event of thermal runaway of a battery cell 100, the gas can preferentially flow towards the pressure relief component 21, thereby preventing the area where the first end wall 13 is located from undergoing significant deformation under the influence of internal high-pressure gas. This prevents the housing 10 from rupturing and releasing heat during thermal runaway, and improves the safety of the battery cell 100 on the side where the electrode outlet section 3 and the first end wall 13 are located.

[0252] In some embodiments, the electrode arrangement 4 is formed by winding a first electrode foil 45, a second electrode foil 46 having opposite polarities, and an insulating element 47 around a winding axis K, the winding axis K being in the first direction z, wherein the first electrode foil 45 and the second electrode foil 46 each have the first tab 42 and the second tab 43 respectively; the center of the electrode arrangement 4 is provided with a second through-hole 44 extending in the first direction z, and the pressure relief component 21 is circular and has a pressure relief area, wherein the maximum diameter φ3 of the second through-hole 44 and the diameter φ1 of the pressure relief area satisfy the relationship φ3 ≥ 0.12 * φ1.

[0253] To achieve better effects, 3 ≥ 0.15 * φ1 must apply so that the gas can quickly reach the pressure relief component 21 via the second through-hole 44 in the event of thermal runaway of the battery cell 100.

[0254] Table 4. Influence of the ratio between the diameters of the second through-hole 44 and the pressure relief area on the safety of the battery cell 100 φ1 φ3 0.12* φ1 If the needle fails to penetrate the electrical connection on one side, will the electrical connection side be damaged? Example 1 25 2 3 Yes Example 2 25 3 3 No Example 3 25 4 3 No Example 4 25 5 3 No

[0255] In embodiment 1 of Table 4, φ3 < 0.12 * φ1. During the puncture failure test near the side where the electrode output section 3 and the first end wall 13 are located, when the battery cell 100 experiences a short circuit and internal thermal runaway, the high-temperature and high-pressure gas cannot reach the pressure relief component 21 in time due to the small diameter of the second through-hole 44 along the second through-hole 44. This results in a slow discharge rate, with the brief occurrence of high pressure causing the gas to escape to the side of the electrode output section, thereby breaking this electrode output section and thus interrupting the electrical connection of the battery cell 100.

[0256] In this embodiment, the diameter φ3 of the second through-hole 44 and the diameter φ1 of the pressure relief area satisfy the relationship mentioned above. In the event of thermal runaway of a battery cell 100, the second through-hole 44 has a sufficient channel size to allow the high-pressure gas inside to flow quickly to the pressure relief component 21. This ensures that the pressure relief component 21 can open smoothly, preventing heat buildup inside the battery cell 100 and avoiding significant deformation or damage to the casing 10 that could lead to heat loss. This improves the operational safety of the battery cell 100.

[0257] In some embodiments, the height of the battery cell 100 along the first direction zh is provided for, where 60 mm ≤ h ≤ 135 mm.

[0258] To achieve better results, h can be selected between 70 mm and 125 mm. At h < 60 mm, the height of battery cell 100 is insufficient, leading to a low state of charge for the entire power battery system. At h > 135 mm, it is difficult to install a pressure relief component 21 at the bottom of battery 200 to drain the fluid. After a thermal runaway of battery cell 100, this cell explodes, causing the entire battery 200 to catch fire and explode.

[0259] By specifying a suitable height for battery cell 100, this embodiment not only ensures that the entire battery system has a sufficient state of charge and that the interior space of battery 200 is optimally utilized, but also provides space for the pressure relief component 21 to discharge the draining fluid in the lower region of battery 200. In the event of thermal runaway, the draining fluid from battery cell 100 can be discharged evenly, thus preventing battery 200 from catching fire and exploding due to sudden high temperatures and high pressure.

[0260] In some embodiments, the housing 10 is circular cylindrical, and the diameter of the housing 10 is φ and the height is h, where ≤3.5.

[0261] To achieve better effects, ≤3 applies. hφ>3.5 A design in which the electrode outlet section 3 and the pressure relief component 21 are located at opposite ends of the housing 10 is unsuitable because the battery cell 100 is elongated. If thermal runaway occurs at a point in the battery cell 100 facing the electrode outlet section 3, the internal gas cannot flow to the end where the pressure relief component 21 is located in time. As a result, thermal energy accumulates, and the gas can more easily escape from the area where the electrode outlet section 3 is located, potentially leading to safety incidents such as fires throughout the power battery system.

[0262] The following explains the influence of on the safety of battery cell 100 with reference to Table 5; the units of the dimensional parameters given in the following table are all in mm.

[0263] Table 5. Influence of on the safety of the battery cell 100 h φ h / φ If the needle fails to penetrate the electrical connection on one side, will the electrical connection side be damaged? Example 1 80 45 1,78 No Example 2 100 45 2,22 No Example 3 120 45 2,67 No Example 4 140 45 3,11 No Example 5 160 45 3,56 Yes Example 6 180 45 4,00 Yes Example 7 80 30 2,67 No Example 8 100 30 3,33 No Example 9 120 30 4,00 Yes

[0264] In Table 5, for embodiments 5, 6, and 9, the value is > 3.5, where the height-to-diameter ratio of the battery cell 100 is relatively large, and it has a slim shape. During the puncture failure test near the side where the electrode outlet section 3 and the first end wall 13 are located, if the battery cell 100 experiences a short circuit and internal thermal runaway, the high-temperature and high-pressure gas may not reach the pressure relief component 21 in time or be able to escape from this pressure relief component 21. The gas may be discharged towards one side of the electrode outlet section, which can damage the electrode outlet section, leading to the failure of the electrical connection of the battery cell 100. For other embodiments, the value is < 3.5, where the height-to-diameter ratio of the battery cell 100 is moderate.During the puncture test near the side where the electrode output section 3 and the first end wall 13 are located, if the battery cell 100 experiences a short circuit and internal thermal runaway, the high-temperature and high-pressure gas can reach the pressure relief component 21 in time or be discharged from this pressure relief component 21. This prevents the gas from being discharged towards one side of the electrode output section, thus avoiding damage to the electrode output section and ensuring the normal electrical connection of the battery cell 100.

[0265] This embodiment ensures, by defining a suitable ratio of height to diameter of the battery cell 100, that even in the event of thermal runaway in any area of ​​the battery cell 100, the high-pressure gas inside can quickly reach the pressure relief component 21 and be smoothly discharged, thereby preventing the accumulation of high-pressure gas and heat in the battery cell 100, thus avoiding fires and explosions in the entire power battery system and improving the safety of battery operation.

[0266] In some embodiments, such as in Fig.As shown in Figure 11, the housing 10 comprises a first end wall 13, the first end wall 13 being provided with a first through-hole 12, the electrode output section 3 of the battery cell 10 being mounted in the first through-hole 12 and being insulated from the first end wall 13, the electrode output section 3 being the first output electrode, and the first end wall 13 being the second output electrode; the battery 200 also comprises a busbar 202, with several battery cells 100 being provided, one end of the busbar 202 being electrically connected to the electrode output section 3 of one of the battery cells 100, and the other end of the busbar 202 being electrically connected to the first end wall 13 of another battery cell 100.

[0267] The busbar 202 can use a thin-plate structure and a metallic conductive material. For example, the busbar 202 can comprise a first part 202A, a second part 202B, and a third part 202C, wherein the second part 202B is connected between the first part 202A and the third part 202C, the first part 202A is connected to the electrode output section 3 of one of the battery cells 100, and the third part 202C is connected to the first end wall 13 of another battery cell 100. The two battery cells 100 can be arranged side by side or at a distance from each other. For example, the shape of the first part 202A fits the shape of the electrode output section 3, such as a circle or a rectangle, the third part 202C can be rectangular, on the side of the third part 202C facing away from the second part 202B a recess can be provided to allow the electrode output section 3 of another battery cell 100 to move out of the way.

[0268] In this embodiment, the electrode output section 3 serves as the first output electrode of the battery cell 100, and the first end wall 13 serves as the second output electrode of the battery cell 100. If several battery cells 100 are connected in series, parallel, or in a mixed configuration within the battery 200, the two ends of the busbar 202 can each be directly connected to the electrode output section 3 or the first end wall 13, respectively.Since only one electrode output section 3 is provided on the first end wall 13 of the housing 10, it is advantageous to increase the electrically conductive area of ​​the electrode output section 3, and the first end wall 13 can also be connected electrically relatively easily by welding or fastening element, which reduces the difficulty of connecting several battery cells 100 and improves the reliability of the electrical connection, thereby ensuring the operational performance and reliability of the battery 200.

[0269] In some embodiments, such as in Fig.As shown in Figure 11, the housing 10 comprises a first end wall 13, the first end wall 13 being provided with a first through-hole 12, the electrode output section 3 of the battery cell 10 being mounted in the first through-hole 12 and being insulated from the first end wall 13, the electrode output section 3 being the first output electrode, and the first end wall 13 being the second output electrode; the battery 200 also comprises several busbars 202, with the electrode output section 3 being electrically connected to one of the busbars 202 within the same battery cell 100, and the first end wall 13 being electrically connected to another busbar 202.

[0270] In this embodiment, each battery cell 100 can be electrically connected to two other battery cells 100 via two independent busbars 202. Since the area of ​​the first end wall 13, which is located around the electrode output section 3, can be used for connecting the busbar 202, it is possible to adapt to various arrangements of several individual cells 100.

[0271] In some embodiments, such as in Fig.As shown in Figure 12, the battery 200 is provided to also include a box component 201 and a support plate 203. The battery cell 100 is mounted in the box component 201 by means of the support plate 203. The support plate 203 is provided with a third through-hole 203' through which the discharge material exiting the pressure relief component 21 can flow away. The pressure relief component 21 is circular and has a pressure relief area. The minimum distance D between the pressure relief component 21 and the inner wall of the box component 201, as well as the diameter φ1 of the pressure relief area, satisfy the following relationship: 0.4 * φ1 ≤ D ≤ 1.2 * φ1.

[0272] For example, a support plate 203 is provided on the inner base surface of the box component 201, and the support plate 203 is provided with several third through-holes 203'. The pressure relief component 21 of the several battery cells 100 are all mounted downwards on the support plate 203. The pressure relief component 21 and the third through-hole 203' have an overlapping portion; for example, the pressure relief component 21, the third through-hole 203', and the end cap 2 are arranged concentrically. Through the third through-hole 203', the discharge material exiting from the interior of the battery cell 100 can flow into the discharge channel inside the battery 200 and finally be discharged to the outside via the pressure relief component on the box component 201 of the battery 200.

[0273] The distance D is designed based on the diameter φ1 of the pressure relief area. To achieve better results, 0.67 * φ1 ≤ D ≤ φ1. If D < 0.4 * φ1, the distance D between the pressure relief component 21 and the inner wall of the box component 201 is too small, resulting in ineffective ejection of the active substance and insufficient cooling of the battery 200; if D > 1.2 * φ1, the distance D between the pressure relief component 21 and the inner wall of the box component 201 is too large, occupying the height of the battery cell 100 and negatively impacting the energy density.

[0274] For example, the size range of φ1 is 20 mm to 35 mm, preferably 22 mm to 32 mm. The size range of D is between 10 mm and 30 mm, preferably 15 mm to 25 mm.

[0275] The following table, numbered 6, explains the influence of the design of the distance D on the cooling to a preset temperature after a thermal runaway of the battery; the units of the dimensional parameters given in the following table are all in mm.

[0276] Table 6. Influence of the design of the gap D in the battery on the cooling to a given temperature after a thermal runaway of the battery. φ1 D 0.4* φ1 1.2* φ1 Battery height Time required for the battery to cool down to 120 °C after a thermal runaway. Example 1 25 8 10 30 107 20 min Example 2 25 15 10 30 100 10 min Example 3 25 20 10 30 95 10 min Example 4 25 35 10 30 80 10 min

[0277] For embodiment 1, D < 0.67 * φ1, meaning the distance D is too small. If the battery cell 100 experiences thermal runaway, the discharge material cannot be drained through the third through-hole 203' in time, the internal temperature of the battery 200 rises sharply, and the time required to cool down to 120 °C is twice as long as in the other embodiments. For embodiment 4, D > 1.2 * φ1, meaning the distance D is too large. Although the discharge material cannot be discharged through the third through-hole 203' in time during thermal runaway of the battery cell 100, the thickness of the support plate 203 is large in order to significantly reduce the height of the battery cell 100 and thus impair its energy density.

[0278] By defining a suitable distance D between the pressure relief component 21 and the inner wall of the box component 201 in this embodiment, not only can the internal gas and the active substance be effectively expelled in the event of thermal runaway of the battery cell 100, thus enabling rapid cooling of the battery 200, but also, based on compliance with safety requirements in the event of thermal runaway, the height of the individual cell 100 is increased as much as possible, thereby increasing the energy density of the battery cell 100, which allows the battery 200 to provide greater driving power.

[0279] In some embodiments, the power-consuming device comprises a vehicle 300, wherein a battery 200 is arranged between the cabin 301 and the vehicle floor plate 302, the electrode output section is arranged towards the cabin 301, and the pressure relief component 21 is arranged towards the vehicle floor plate 302.

[0280] In this embodiment, in the event of a thermal runaway of the battery 200 during use, since the pressure relief component 21 of the battery cell 100 is arranged in the direction towards the vehicle floor plate 302, i.e. downwards, when the pressure relief component 21 opens, the discharge material released by the battery 200 can be expelled downwards from the vehicle, thereby reducing the influence of high temperature and high pressure on the cabin 301 and the passengers, and increasing the safety of the vehicle 300 during use.

[0281] In some specific embodiments, such as in Fig. 3, Fig. 4 to Fig. As shown in Figure 5, the battery cell 100 is circular cylindrical and comprises a housing 10, an electrode assembly 4, and an electrode output section 3. The housing 10 includes a receiving section 1 and an end cap 2. The receiving section 1 has a circular cylindrical structure and is provided at one end along the first direction z (central axis) with an opening 11, which is closed by the end cap 2. The receiving section 1 comprises a first end wall 13 and a side wall 15, with the end cap 2 serving as the second end wall 14.

[0282] The end cap 2 is integrally provided with a pressure relief component 21, which can be circular and is located in the center position of the end cap 2. The first end wall 13 is provided with a first through-hole 12, which is located in the center position of the first end wall 13, and the electrode outlet section 3 is mounted in the first through-hole 12.

[0283] The electrode assembly 4 comprises an electrode body 41, a first tab 42, and a second tab 43. The first tab 42 and the second tab 43 are located at the two ends of the electrode body 41 along the first direction z, which coincides with the winding axis. The first tab 42 is electrically connected to the electrode output section 3 via the first current collector 5. The second tab 42 is electrically connected to the end cap 2 via the second current collector 6. The end cap 2 is welded to the receiving section 1, allowing the second tab 43 to transfer electrical energy to the first end wall 13 via the second current collector 6, the end cap 2, and the side wall 15. For example, the electrode output section 3 serves as the cathode output electrode, and the first end wall 13 serves as the anode output electrode, or vice versa.

[0284] Although the present application is described with reference to preferred embodiments, various modifications can be made and components replaced by equivalent ones without departing from the scope of the present application. In particular, the technical features mentioned in the individual embodiments can be combined arbitrarily, as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions that fall within the scope of the claims. Reference symbol list: 100 battery cells; 10 cases; 1 recording section; 11 Opening; 12 First through hole; 13 First end wall; 14 Second end wall; 15 side wall; 2 End cap; 21 Pressure relief component; 22nd notch; 23 recesses; 3 Electrode output section; 31 Main body section; 32 base; 33 Limiting projection; 34 recesses; 341 First recess; 342 Second recess; 343 Third through hole; 4 electrode arrangement; 41 electrode bodies; 42 First tab; 43 Second tab; 44 Second through hole; 45 First electrode foil; 45' First coating layer; 46 Second electrode foil; 46' Second coating layer; 47 Insulating element; 5 First power collector; 6 Second power collector; 6' recess section; 61 Fourth through hole. 62 engraving lines; 63 Incision; 7 Insulating element; 8 Cover plate; K winding axis; z First direction; y Second direction; x Third direction; 200 battery; 201 Box component; 201A Box section; 201B First cover body; 201C Second cover body; 202 busbar; 202A First Section; 202B Section Two; 202C Third Section; 203 Support plate; 203' Third through hole; 300 vehicles; 301 Cabin; 302 Base plate. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 2022 / 101981

[0001]

Claims

Battery cell comprising: an electrode assembly (4) comprising an electrode body (41) and a first tab (42) and a second tab (43) with opposite polarities, wherein the first tab (42) and the second tab (43) extend out of the electrode body (41); a first output electrode and a second output electrode, wherein the first output electrode is electrically connected to the first tab (42) and the second output electrode is electrically connected to the second tab (43); a housing (10) for receiving the electrode assembly (4), wherein the housing (10) is provided with a pressure relief component (21), wherein the first and second output electrodes are located at one end of the housing (10) in the first direction (z), while the pressure relief component (21) is located at the other end of the housing (10). Battery cell according to claim 1, wherein the housing (10) comprises a first end wall (13), a second end wall (14) opposite each other along a first direction (z), and a side wall (15) located between the first end wall (13) and the second end wall (14), wherein the first end wall (13) is provided with a first through-hole (12) and the electrode output section (3) of the battery cell (10) is mounted in the first through-hole (12) and is provided insulated from the first end wall (13), wherein the second end wall (14) is provided with the pressure relief component (21); wherein the electrode output section (3) is the first output electrode and the first end wall (13) is the second output electrode. Battery cell according to claim 2, wherein the housing (10) comprises a receiving section (1) and an end cap (2), wherein the receiving section (1) has an opening (11), wherein the end cap (2) is used to close the opening (11), wherein the receiving section (1) is formed by the first end wall (13) and the side wall (15) and the end cap (2) is the second end wall (14). Battery cell according to claim 2, wherein the housing (10) comprises a receiving section (1) and an end cap (2) and the receiving section (1) has an opening (11), wherein the end cap (2) is used to close the opening (11), wherein the receiving section (1) is formed by the second end wall (14) and the side wall (15), wherein the end cap (2) is the first end wall (13). Battery cell according to one of claims 2 to 4, wherein the first tab (42) extends from the electrode body (41) along the first direction (z) towards the electrode output section (3), wherein the second tab (43) extends from the electrode body (41) along the first direction (z) away from the electrode output section (3), wherein the first tab (42) is electrically connected to the electrode output section (3) and the second tab (43) is electrically connected to the first end wall (13). Battery cell according to claim 5, further comprising a first current collector (5) and a second current collector (6), wherein the first tab (42) is electrically connected to the electrode output section (3) via the first current collector (5), wherein the second tab (43) is electrically connected to the first end wall (13) via the second current collector (6). Battery cell according to claim 6, wherein the second current collector (6) is in contact with the side wall (15) to establish an electronic conductivity between the second tab (43) and the first end wall (13). Battery cell according to claim 6, wherein the housing (10) comprises a receiving section (1) and an end cap (2), wherein the receiving section (1) has an opening (11), wherein the end cap (2) is used to close the opening (11), wherein the second current collector (6) is connected to the end cap (2) and the end cap (2) is electrically connected to the side wall (15) to achieve electronic conductivity between the second tab (43) and the first end wall (13). Battery cell according to claim 6, wherein the housing (10) comprises a receiving section (1) and an end cap (2), wherein the receiving section (1) has an opening (11), wherein the end cap (2) is used to close the opening (11), wherein the second current collector (6) is in contact with the side wall (15) and the end cap (2) is connected to the second current collector (6) to achieve electronic conductivity between the second tab (43) and the first end wall (13). Battery cell according to one of claims 6 to 9, wherein the second current collector (6) is located between the pressure relief component (21) and the second tab (43) in the first direction (z), wherein the second current collector (6) is provided with a recess section (6'), wherein the recess section (6') is used to allow the gas flow between the space on one side of the second current collector (6) facing the second tab (43) and the space on the other side facing the pressure relief component (21). Battery cell according to claim 10, wherein the recess section (6') comprises at least one fourth through-hole (61), wherein the fourth through-hole (61) is located in the central position of the second current collector (6). Battery cell according to claim 11, wherein several fourth through holes (61) are provided and the remaining fourth through holes (61) are distributed around the fourth through hole (61) in the central position. Battery cell according to claim 11, wherein the recess section (6') further comprises several incisions (63), wherein the incisions (63) extend through the second current collector (6) along the first direction (z), wherein the several incisions (63) surround the fourth through hole (61). Battery cell according to claim 13, wherein one end of the cut (63) is connected to the fourth through hole (61) and extends away from the fourth through hole (61). Battery cell according to claim 11, wherein the recess section (6') further comprises an engraving line (62), the engraving line (62) extending through the second current collector (6) along the first direction (z). Battery cell according to claim 15, wherein several engraving lines (62) are provided, wherein one end of the engraving line (62) is connected to the fourth through hole (61) and extends away from the fourth through hole (61). Battery cell according to one of claims 2 to 4, wherein the first tab (42) and the second tab (43) are each extended from an end of the electrode body (41) facing the electrode output section (3) along the first direction (z), wherein the first tab (42) is electrically connected to the electrode output section (3), and wherein the second tab (43) is electrically connected to the first end wall (13). Battery cell according to any one of claims 2 to 17, further comprising a first current collector (5) and a second current collector (6), wherein the first tab (42) is electrically connected to the electrode output section (3) via the first current collector (5), wherein the second tab (43) is electrically connected to the first end wall (13) via the second current collector (6); wherein the electrode output section (3) comprises a base (31) and a main body (32), wherein the base (31) is located between the first end wall (13) and the first current collector (5) and is used to prevent the movement of the electrode output section (3) in the first direction (z) away from the interior of the housing (10), wherein an insulating element (7) is provided between the first end wall (13) and the base (31), and wherein at least a part of the main body (32) is located within the first through-hole (12). Battery cell according to claim 18, wherein along the first direction (z) the maximum thickness t1 of the base (31) satisfies the condition 0.6 mm ≤ t1 ≤ 1.2 mm; and / or the maximum thickness t2 of the first current collector (5) satisfies the condition 0.3 mm ≤ t2 ≤ 0.7 mm; and / or the maximum thickness t3 of the second current collector (6) satisfies the condition 0.3 mm ≤ t3 ≤ 0.7 mm. Battery cell according to claim 19, wherein 0.8 mm ≤ t1 ≤ 1 mm and / or 0.4 mm ≤ t2 ≤ 0.6 mm and / or 0.4 mm ≤ t3 ≤ 0.6 mm. Battery cell according to one of claims 18 to 20, wherein the electrode output section (3) also comprises a limiting projection (33), wherein the base (31) and the limiting projection (33) are each connected to and project from the outer circumferential wall of the main body (32), wherein the limiting projection (33) and the base (31) are located on the outside and inside of the first end wall (13), respectively, along the first direction (z), and are used to clamp a part of the first end wall (13). Battery cell according to claim 21, wherein the main body (32) is provided with a recess (34), wherein the bottom wall of the recess (34) is connected to the first current collector (5) to allow the electronic connection between the electrode output section (3) and the first tab (42), wherein the opening of the recess (34) is arranged on a side of the main body (32) facing the interior of the housing (10) and / or away from it. Battery cell according to claim 22, wherein the bottom wall of the recess (34) is laser welded to the first current collector (5) from a side of the main body (32) facing away from the interior of the housing (10). Battery cell according to one of claims 2 to 23, wherein the housing (10) is circular cylindrical, wherein the pressure relief component (21) is arranged in the central position of the second end wall (14) and is circular, wherein the pressure relief component (21) has a pressure relief area, wherein the diameter φ1 of the pressure relief area and the diameter φ of the housing (10) are related by the relationship 0.35 ≤ ∅ 1 ∅ ≤ 0.85 fulfill. Battery cell (100) according to claim 24, wherein 15 mm ≤ φ ≤ 70 mm. Battery cell according to one of claims 2 to 25, wherein the thickness l1 of the first end wall (13) and the thickness l2 of the second end wall (14) satisfy the relationship l1 ≥ l2. Battery cell according to claim 26, wherein l1 ≥ 1.5 * l2. Battery cell according to claim 26 or 27, wherein the thickness l1 of the first end wall (13) is in the size range 0.5 mm ≤ l1 ≤ 1 mm; and / or the thickness l2 of the second end wall (14) is in the size range 0.3 mm ≤ l2 ≤ 1 mm. Battery cell according to claim 28, wherein 0.6 mm ≤ l1 ≤ 0.8 mm and / or 0.5 mm ≤ l2 ≤ 0.8 mm. Battery cell according to one of claims 2 to 29, wherein the second end wall (14) is provided with a notch (22), wherein the area of ​​the second end wall (14) enclosed by the notch (22) forms the pressure relief component (21). Battery cell according to claim 30, wherein the thickness l1 of the first end wall (13) and the thickness l3 at the position of the second end wall (14) provided with the notch (22) satisfy the relationship l1≥2*l3. Battery cell according to claim 31, wherein l1 ≥ 6*l3. Battery cell according to one of claims 2 to 32, wherein the pressure relief component (21) is circular and has the pressure relief area, wherein the diameter φ2 of the first through-hole (12) and the diameter φ1 of the pressure relief area satisfy the relationship φ2≤φ1. Battery cell according to claim 33, wherein the diameter φ2 of the first through-hole (12) is in the size range 8 mm ≤ φ2 ≤ 25 mm; and / or the diameter φ1 of the pressure relief area is in the size range of 20 mm ≤ φ1 ≤ 35 mm. Battery cell according to any one of claims 1 to 34, wherein the electrode arrangement (4) is formed by winding the first electrode foil (45), the second electrode foil (46) and the insulating element (47) with opposite polarity around the winding axis (K), wherein the winding axis (K) coincides with the first direction (z), wherein the first electrode foil (45) and the second electrode foil (46) each have the first tab (42) and the second tab (43), respectively; wherein the center of the electrode arrangement (4) is provided with a second through-hole (44) extending in the first direction (z), wherein the pressure relief component (21) is circular and has the pressure relief area, wherein the maximum diameter φ3 of the second through-hole (44) and the diameter φ1 of the pressure relief area satisfy the relationship φ3 ≥ 0.12 * φ1. Battery cell according to one of claims 1 to 35, wherein the housing (10) comprises a second end wall (14), wherein the pressure relief component (21) is located in the central area of ​​the second end wall (14). Battery comprising a battery cell (100) according to any one of claims 1 to 36. Battery according to claim 37, wherein the housing (10) comprises a first end wall (13), the first end wall (13) being provided with a first through-hole (12), the electrode output section (3) of the battery cell (10) being mounted in the first through-hole (12) and being insulated from the first end wall (13), the electrode output section (3) being the first output electrode, and the first end wall (13) being the second output electrode; wherein the battery (200) also comprises a busbar (202), wherein several battery cells (100) are provided, one end of the busbar (202) being electrically connected to the electrode output section (3) of one of the battery cells (100) and the other end of the busbar (202) being electrically connected to the first end wall (13) of another battery cell (100). Battery according to claim 37 or 38, wherein the housing (10) comprises a first end wall (13), the first end wall (13) being provided with a first through-hole (12), the electrode output section (3) of the battery cell (10) being mounted in the first through-hole (12) and being insulated from the first end wall (13), the electrode output section (3) being the first output electrode, and the first end wall (13) being the second output electrode; wherein the battery (200) further comprises several busbars (202), wherein within the same battery cell (100) the electrode output section (3) is electrically connected to one of the busbars (202) and the first end wall (13) is electrically connected to another busbar (202). Battery according to one of claims 37 to 39, wherein the battery (200) further comprises a support plate (203) and a box component (201), wherein the battery cell (100) is mounted in the box component (201) via the support plate (203), wherein the support plate (203) is provided with a third through-hole (203') for the flow of the discharge material exiting the pressure relief component (21), wherein the pressure relief component (21) is circular and has the pressure relief area, wherein the minimum distance D between the pressure relief component (21) and the inner wall of the box component (201) and the diameter φ1 of the pressure relief area satisfy the relationship 0.4*φ1≤D≤1.2*φ1. Power-consuming device comprising the battery (200) according to any one of claims 37 to 40, wherein the battery (200) is used to supply the power-consuming device with electrical energy. Power-consuming device according to claim 41, wherein the power-consuming device comprises a vehicle (300), wherein the battery (200) is arranged between the cabin (301) and the vehicle floor panel (302), wherein the first output electrode and the second output electrode are each arranged oriented towards the cabin (301), wherein the pressure relief component (21) is arranged oriented towards the vehicle floor panel (302).

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