Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery monomer, a battery device and electric equipment. The battery cell provided by the present application comprises: a case main body having an open end; the cover body covers the opening end, the shell main body and the cover body form a containing cavity used for containing the electrode assembly, the cover body comprises a cover body and a pressure relief mechanism, and the pressure relief mechanism is arranged on the cover body; the cover body further comprises at least one protruding part, the protruding part is arranged on the side, away from the electrode assembly, of the cover body, and the protruding part is arranged beside the pressure relief mechanism. By applying the technical scheme, the problem that the pressure relief mechanism of the battery monomer is blocked by foam and cannot be normally opened in the prior art is solved.

Description

Technical Field

[0001] This application belongs to the field of battery equipment technology, and in particular relates to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Currently, battery devices are designed to include a main body, a cover, and at least one battery cell. The battery cell is assembled within the space formed by the close connection between the main body and the cover. Battery devices are widely used for storing or supplying electrical energy, such as in electric vehicles. During operation, external forces and airflow can cause the cover plate to vibrate and deform. This can cause the cover plate to strike components such as the pressure relief mechanism of the battery cell, resulting in noise and abnormal sounds. In severe cases, the cover plate can obstruct the pressure relief mechanism from opening properly in the event of thermal runaway in the battery cell. This can prevent the exhaust gases generated by thermal runaway from being properly released through the pressure relief mechanism, potentially leading to a battery cell explosion and posing a safety hazard. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, a battery device, and an electrical appliance, including but not limited to solving the problem in the related art where the pressure relief mechanism of the battery cell is obstructed by foam and cannot be opened normally.

[0004] To achieve the above objectives, according to the first aspect of this application, the technical solution adopted in this application is: a battery cell, comprising:

[0005] The shell body has an open end;

[0006] The cover is closed at the open end, and the shell body and the cover form a receiving cavity for accommodating the electrode assembly. The cover includes a cover body and a pressure relief mechanism, and the pressure relief mechanism is disposed on the cover body.

[0007] The cover also includes at least one protrusion located on the side of the cover body away from the electrode assembly and on the side of the pressure relief mechanism.

[0008] In the cover of this battery cell, both the pressure relief mechanism and the protrusion are located on the cover body, with the protrusion spaced apart from and close to the pressure relief mechanism. This allows the protrusion to provide sufficient space for the pressure relief mechanism to operate, ensuring its proper functioning even in the event of thermal runaway within the battery cell. This allows the fumes generated during thermal runaway to be smoothly discharged from the pressure relief mechanism, reducing the probability of it being blocked by other components within the battery cell and thus improving safety.

[0009] In some embodiments of this application, the cover includes multiple protrusions surrounding the pressure relief mechanism, and the protrusions are spaced apart. This reduces the possibility that the pressure relief mechanism may be blocked by other components inside the battery device, ensuring that the pressure relief mechanism can be smoothly actuated in the event of thermal runaway.

[0010] In some embodiments of this application, the cover includes two protrusions located on opposite sides of the pressure relief mechanism. These two opposing protrusions simultaneously support other components within the battery device, ensuring the pressure relief mechanism always has sufficient space for smooth operation.

[0011] In some embodiments of this application, the two protrusions are symmetrically arranged with respect to the center point of the pressure relief mechanism, which simplifies the structure and helps to simplify the overall structure of the cover.

[0012] In some embodiments of this application, the battery cell further includes an electrode terminal for electrical connection with an electrode assembly, and at least one electrode terminal is mounted on the cover body, with the protrusion spaced apart from the electrode terminal.

[0013] In some embodiments of this application, two electrode terminals are mounted on the cover body, located on both sides of the pressure relief mechanism, and the line connecting the center points of the two electrode terminals intersects the protrusion. The protrusion provides sufficient space for the pressure relief mechanism to operate, thus enabling the pressure relief mechanism to operate normally when the battery cell experiences thermal runaway inside the battery device.

[0014] In some embodiments of this application, at least one protrusion is provided between each electrode terminal and the pressure relief mechanism.

[0015] In some embodiments of this application, the two electrode terminals are symmetrically arranged with respect to the center point of the pressure relief mechanism.

[0016] In some embodiments of this application, two electrode terminals are mounted on the cover body, located on both sides of the pressure relief mechanism. The cover body includes two protrusions, and the line connecting the center points of the two electrode terminals intersects the line connecting the two protrusions. Thus, other components covering the top of the battery cell are supported not only by the two protrusions but also by the two electrode terminals, providing sufficient space for the pressure relief mechanism to actuate.

[0017] In some embodiments of this application, the line connecting the center points of the two electrode terminals is perpendicular to the line connecting the two protrusions. This forms a four-point support structure for other components, providing sufficient space for the pressure relief mechanism to actuate, thus enabling the pressure relief mechanism to operate normally when the battery cell experiences thermal runaway inside the battery device.

[0018] In some embodiments of this application, the protrusion height of the protrusion relative to the surface of the cover body is S1, and the protrusion height of the electrode terminal relative to the surface of the cover body is W1, where 0mm < W1 ≤ S1. Thus, the protrusion can directly abut against other components covering the top of the battery cell, thereby providing sufficient actuation space for the pressure relief mechanism.

[0019] In some embodiments of this application, the cover further includes a convex hull structure disposed on the cover body. The convex hull structure protrudes away from the electrode assembly relative to the cover body. The convex hull structure is spaced apart from the electrode terminals. The pressure relief mechanism and the protrusion are both disposed on the convex hull structure. The convex hull structure not only improves the space utilization of the electrode assembly within the receiving cavity, but also allows the internal space formed by the convex hull structure to accommodate necessary devices such as overcharge protection devices and overcurrent protection devices.

[0020] In some embodiments of this application, the height of the protrusion relative to the surface of the cover body is S2, that is, the sum of the height of the convex structure and the height of the protrusion is S2, and the height of the electrode terminal relative to the surface of the cover body is W1, where 0mm < W1 ≤ S2. In this way, the protrusion can directly abut against other components covering the top of the battery cell, thereby leaving sufficient actuation space for the pressure relief mechanism.

[0021] In some embodiments of this application, the distance between the protrusion and the pressure relief mechanism is L, where 0mm ≤ L ≤ 50mm. This ensures that the protrusion has a reasonable position relative to the pressure relief mechanism, allowing sufficient actuation space for the two protrusions to support the pressure relief mechanism.

[0022] In some embodiments of this application, the protrusion is integrally formed with the cover body.

[0023] In some embodiments of this application, the protrusion is an independent component relative to the cover body, and the protrusion is fixedly connected to the cover body.

[0024] In some embodiments of this application, the protrusion is an insulating component integrally molded from an insulating material. The protrusion of the insulating component can directly contact other components inside the battery device without causing a short circuit.

[0025] In some embodiments of this application, the protrusion includes a metal body and an insulating layer, wherein the insulating layer covers the end of the metal body away from the cover body, or the insulating layer wraps around the metal body.

[0026] According to a second aspect of this application, a battery device is provided. The battery device includes:

[0027] Box body;

[0028] The lid fits snugly against the body of the box to create an assembly space; and

[0029] Multiple battery cells as described above are installed in the assembly space;

[0030] The protrusion faces the inner wall of the lid.

[0031] The battery device is assembled using the battery cells provided in the embodiments of this application, meaning the battery cells are assembled within the assembly space of the battery device. In the cover of the battery cell, both the pressure relief mechanism and the protrusion are disposed on the cover body, with the protrusion spaced apart from and close to the pressure relief mechanism. Thus, when the battery device deforms due to a collision, causing thermal runaway of the battery cell, the protrusion can support the deformed cover, providing sufficient space for the pressure relief mechanism to actuate. This allows the pressure relief mechanism to operate normally when thermal runaway occurs inside the battery cell, enabling the fumes generated by thermal runaway inside the battery cell to be smoothly discharged through the pressure relief mechanism. This reduces the probability that the pressure relief mechanism will be blocked by the deformed cover inside the battery device and unable to operate normally, improving safety. Furthermore, during normal operation of the battery device, the protrusion can also support the cover plate when it vibrates and deforms due to external forces, airflow, or other factors. This prevents the cover plate from hitting the pressure relief mechanism of the battery cell, thus preventing the pressure relief mechanism from malfunctioning or being damaged, and ensuring that the pressure relief mechanism can always operate normally.

[0032] In some embodiments of this application, the battery device further includes a retainer plate. Multiple battery cells are arranged in an array within the assembly space. The electrode terminals of adjacent battery cells are electrically connected via the retainer plate. The retainer plate has a thickness of W2. The height of the top of the protrusion relative to the surface of the cover body is S, and the protrusion height of the electrode terminals relative to the surface of the cover body is W1, where 0.5mm ≤ S ≤ W1 + W2 + 5mm. Thus, the protrusion provides sufficient space for the pressure relief mechanism to operate. Furthermore, when the cover plate vibrates and deforms due to external forces or airflow, the protrusion can reduce the impact force of the cover on the battery cells, thus reducing impact noise.

[0033] In some embodiments of this application, the protrusion is a conductive structure, and the battery device further includes an insulating patch attached to the top of the protrusion away from the cover body. The insulating patch provides insulation between the protrusion and the inner wall of the cover plate, ensuring that the protrusion supports the cover while preventing a short circuit between the protrusion and the cover.

[0034] In some embodiments of this application, the insulating patch and the protrusion are provided in a one-to-one correspondence.

[0035] In some embodiments of this application, when multiple battery cell arrays are arranged in an assembly space, the pressure relief mechanisms of multiple battery cells in the same column are arranged in a straight line, and an insulating patch covers the top of the protrusions of multiple battery cells along the arrangement direction of the battery cells in the same column.

[0036] In some embodiments of this application, the insulating patch contacts the inner wall of the case cover. This assembly method, where the insulating patch contacts the inner wall of the case cover, maximizes the optimization of the overall space utilization of the battery device and improves battery energy density.

[0037] In some embodiments of this application, the protrusion is an insulating structure, and the top of the protrusion away from the cover body contacts the inner wall of the box cover.

[0038] According to a third aspect of this application, an electrical device is provided, which includes an electrical load. The electrical device further includes a plurality of battery cells as described above, the battery cells being used to store electrical energy or supply power to the electrical load; in some embodiments of this application, the electrical device further includes a battery device as described above, the battery device being used to store electrical energy or supply power to the electrical load. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the structure of another battery cell according to an embodiment of this application;

[0042] Figure 3 for Figure 2 A top view of a single battery cell is shown.

[0043] Figure 4 for Figure 3 Cross-sectional view along the AA direction;

[0044] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0045] Figure 6 for Figure 4 Enlarged view of point C in the middle;

[0046] Figure 7This is a schematic diagram of the structure of another battery cell according to an embodiment of this application;

[0047] Figure 8 for Figure 7 A top view of a single battery cell is shown.

[0048] Figure 9 for Figure 8 Cross-sectional view along the DD direction;

[0049] Figure 10 This is a front view schematic diagram of another battery cell according to an embodiment of this application;

[0050] Figure 11 for Figure 10 Enlarged view of point E in the middle;

[0051] Figure 12 This is a schematic diagram of the structure of other battery cells in the embodiments of this application;

[0052] Figure 13 This is an exploded view of a battery device according to an embodiment of this application;

[0053] Figure 14 for Figure 13 The diagram shows a battery device with an array of battery cells arranged in an array, in which two adjacent battery cells in the same column are connected by a plate.

[0054] Figure 15 for Figure 14 A top-down view;

[0055] Figure 16 for Figure 15 Cross-sectional view along the FF direction;

[0056] Figure 17 for Figure 16 Enlarged view of point G in the middle;

[0057] Figure 18 This is a schematic diagram of the structure of another battery device according to an embodiment of this application, in which two adjacent battery cells in the same column are connected by a tab and the protrusion is covered by an insulating patch.

[0058] Figure 19 for Figure 18 Front view diagram;

[0059] Figure 20 for Figure 19 Enlarged view of point H in the middle;

[0060] Figure 21 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application.

[0061] The figures in the diagram are labeled as follows:

[0062] 100. Battery cell;

[0063] 10. Shell body; 11. Open end; 12. Receiving cavity;

[0064] 20. Cover body; 21. Cover body; 22. Pressure relief mechanism; 23. Protrusion; 231. Metal body; 232. Insulating layer; 24. Convex bulge structure;

[0065] 30. Electrode assembly;

[0066] 40. Electrode terminals;

[0067] 200. Battery device;

[0068] 201. Box body; 202. Box lid; 203. Assembly space; 204. Bar plate; 205. Insulating patch;

[0069] 400. Electrical equipment;

[0070] 401. Electrical load; 402. Control device; 403. Frame; 404. Wheel. Detailed Implementation

[0071] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0072] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0073] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0074] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0075] Currently, judging from market trends, the application of power batteries (including but not limited to lithium batteries and sodium batteries) is becoming increasingly widespread. Power batteries are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in police equipment, military equipment, and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing. Furthermore, users' quality requirements for power batteries are constantly rising. Power battery quality is reflected in many aspects, including but not limited to long service life, strong energy storage capacity, and high safety. Among these, high safety is one of the most important quality requirements.

[0076] In related technologies, during the design of battery devices, compressible foam is typically installed between the battery cell and the cover plate to prevent the cover from impacting components such as the pressure relief mechanism of the battery cell. This foam acts as a barrier between the cover and the battery cell, preventing the cover from striking these components. However, when the foam covers and presses against the pressure relief mechanism, it can obstruct its opening during thermal runaway of the battery cell. This prevents the fumes generated during thermal runaway from escaping smoothly, potentially leading to a battery cell explosion and posing a safety hazard.

[0077] Based on the above considerations, embodiments of this application provide a battery cell with a protrusion on its cover. This protrusion provides sufficient space for the pressure relief mechanism to operate, ensuring its proper functioning even in the event of thermal runaway. This allows the fumes generated during thermal runaway to be smoothly discharged from the battery cell, improving safety. Furthermore, this battery cell can be used in the assembly and production of battery devices, energy storage devices, energy storage systems, charging grids, and electrical appliances.

[0078] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0079] The battery cell 100 provided in the embodiments of this application refers to a square battery, that is, the overall outline of the battery cell 100 is rectangular. The square battery has a length direction X, a width direction Y, and a height direction Z, such as... Figure 1 As shown.

[0080] like Figures 1 to 4 , Figure 7 , Figure 8 and Figure 12 As shown, the battery cell 100 provided in the embodiments of this application includes a casing body 10, a cover 20, and an electrode assembly 30. The casing body 10 has an open end 11, and the cover 20 covers the open end 11. The casing body 10 and the cover 20 form a receiving cavity 12 for accommodating the electrode assembly 30. The cover 20 includes a cover body 21 and a pressure relief mechanism 22, which is disposed on the cover body 21. Furthermore, the cover 20 also includes at least one protrusion 23, which is disposed on the side of the cover body 21 opposite to the electrode assembly 30 and on the side of the pressure relief mechanism 22.

[0081] The battery cell 100 provided in the embodiments of this application is used in the assembly production of a battery device 200, and the battery cell 100 is assembled within the assembly space 203 of the battery device 200. In the cover 20 of the battery cell 100, both the pressure relief mechanism 22 and the protrusion 23 are disposed on the cover body 21, and the protrusion 23 and the pressure relief mechanism 22 are spaced apart and close to each other. Thus, the protrusion 23 provides sufficient space for the pressure relief mechanism 22 to actuate, allowing the pressure relief mechanism 22 to operate normally when thermal runaway occurs inside the battery cell 100 within the battery device 200. This ensures that the fumes generated inside the battery cell 100 due to thermal runaway can be smoothly discharged from the pressure relief mechanism 22, reducing the probability that the pressure relief mechanism 22 will be blocked by other components within the battery device 200 and unable to operate normally, thereby improving safety.

[0082] In some embodiments of this application, a pressure relief mechanism 22 is provided on the outer casing. The pressure relief mechanism 22 is used to release the internal pressure of the battery cell 100.

[0083] As an example, the internal pressure or temperature of the battery cell 100 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief mechanism 22 is activated or a weak structure provided in the pressure relief mechanism 22 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 100.

[0084] As an example, the pressure relief mechanism 22 can be integrally formed with the housing (housing body 10 and / or cover 20), for example, by making grooves on the housing to form a weak structure that serves as the pressure relief mechanism 22.

[0085] The pressure relief mechanism 22 can also be separately disposed from and connected to the housing, for example, by welding it to the housing or by connecting it through other components. As an example, the pressure relief mechanism 22 is provided with grooves to form a weak structure.

[0086] As an example, the pressure relief mechanism 22 can take the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve, or a safety valve.

[0087] The term "actuation" as used in this application refers to the pressure relief mechanism 22 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 100. The actions of the pressure relief mechanism 22 may include, but are not limited to: movement of components within the pressure relief mechanism 22 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 22, etc. When the pressure relief mechanism 22 is actuated, the high-temperature, high-pressure substances inside the battery cell 100 are discharged outwards from the actuated portion as exhaust materials. In this way, the battery cell 100 can be depressurized and de-temperatureed under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0088] The emissions from the battery cell 100 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0089] In some embodiments of this application, the cover 20 includes a plurality of protrusions 23 surrounding the pressure relief mechanism 22. This positions the pressure relief mechanism 22 within the space supported by the protrusions 23, reducing the likelihood of the pressure relief mechanism 22 being blocked by other components inside the battery device 200 and ensuring that the pressure relief mechanism 22 can be smoothly actuated in the event of thermal runaway. Furthermore, the protrusions 23 are spaced apart, allowing the fumes emitted by the pressure relief mechanism 22 during thermal runaway to diffuse rapidly through the gaps between the protrusions 23, preventing fumes from accumulating in the space formed by the protrusions 23.

[0090] like Figures 1 to 4 , Figures 6 to 10 and Figure 12As shown, the battery cell 100 also includes an electrode terminal 40, which is used for electrical connection with the electrode assembly 30. Furthermore, in the battery device 200, when the battery device 200 includes multiple battery cells 100, the electrode terminals 40 of the multiple battery cells 100 are connected in series, in parallel, or in a mixed connection via tabs, thereby achieving the design parameters of the rated output voltage required by the battery device 200.

[0091] In some embodiments of this application, an electrode terminal 40 (serving as the positive or negative output terminal of the battery cell 100) is mounted on the cover body 21, and another electrode terminal 40 (serving as the negative or positive output terminal of the battery cell 100) is mounted on one side wall of the shell body 10. The protrusion 23 is spaced apart from the electrode terminal 40, and the pressure relief mechanism 22 is also spaced apart from the electrode terminal 40. When only one protrusion 23 is provided on the cover body 21, the protrusion 23 can be located on the side of the pressure relief mechanism 22 facing the electrode terminal 40, or it can be located on the side of the pressure relief mechanism 22 away from the electrode terminal 40. The protrusion 23 provides sufficient space for the pressure relief mechanism 22 to operate, thus enabling the pressure relief mechanism 22 to operate normally when thermal runaway occurs inside the battery cell 100 within the battery device 200. This allows the flue gas generated inside the battery cell 100 due to thermal runaway to be smoothly discharged from the pressure relief mechanism 22, reducing the probability that the pressure relief mechanism 22 will be blocked by other components within the battery device 200 and unable to operate normally, thereby improving safety.

[0092] In other embodiments of this application, such as Figures 1 to 4 , Figures 6 to 10 and Figure 12The battery cell 100 shown has two electrode terminals 40 mounted on its cover body 21. These two electrode terminals 40 serve as the positive and negative output terminals of the battery cell 100, respectively. The two electrode terminals 40 are symmetrically arranged with respect to the center point of the pressure relief mechanism 22. The arrangement direction of the two electrode terminals 40 (i.e., the line connecting the center points of the two electrode terminals 40) is consistent with the length direction X of the battery cell 100. Of course, the arrangement direction of the two electrode terminals 40 can also intersect the length direction X of the battery cell 100. In this embodiment, it is preferred that the arrangement direction of the two electrode terminals 40 is consistent with the length direction X of the battery cell 100. In this embodiment, the pressure relief mechanism 22 is located between the two electrode terminals 40, that is, the two electrode terminals 40 are located on both sides of the pressure relief mechanism 22. In this application, at least one protrusion 23 is provided on the cover body 21 between the pressure relief mechanism 22 and one of the electrode terminals 40, and on the cover body 21 between the pressure relief mechanism 22 and the other electrode terminal 40. Preferably, each electrode terminal 40 and the pressure relief mechanism 22 has at least one protrusion 23 between them. Furthermore, the protrusion 23 is positioned close to the pressure relief mechanism 22 relative to the corresponding electrode terminal 40. The protrusion 23 provides sufficient space for the pressure relief mechanism 22 to operate, ensuring its proper functioning even when thermal runaway occurs inside the battery cell 100 within the battery device 200. This allows the flue gas generated by thermal runaway inside the battery cell 100 to be smoothly discharged from the pressure relief mechanism 22, reducing the probability that the pressure relief mechanism 22 will be blocked by other components within the battery device 200 and thus improving safety.

[0093] In this embodiment, the battery cell 100 provided in the present application is an example embodiment in which two electrode terminals 40 are installed on the cover body 21. Furthermore, for embodiments in which only one electrode terminal 40 is installed on the cover body 21, please refer to the embodiments in which two electrode terminals 40 are installed on the cover body 21.

[0094] like Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 12As shown in the embodiments of this application, the cover 20 includes two protrusions 23, which are respectively located on opposite sides of the pressure relief mechanism 22. That is, one protrusion 23 is provided on the cover body 21 between the pressure relief mechanism 22 and one of the electrode terminals 40, and another protrusion 23 is provided on the cover body 21 between the pressure relief mechanism 22 and the other electrode terminal 40. The two protrusions 23, which are arranged opposite to each other, also support other components inside the battery device 200 for the pressure relief mechanism 22. That is, the two protrusions 23 and the other components spanning between the two protrusions 23 form a space similar to a bridge hole (referred to as a "bridge hole space" in the embodiments of this application). The pressure relief mechanism 22 is located in this bridge hole space, so that the pressure relief mechanism 22 always has a smooth operating space.

[0095] In some embodiments of this application, the two protrusions 23 are symmetrically arranged with respect to the center point of the pressure relief mechanism 22. The structural form of the two protrusions 23 that are centrally symmetrical with respect to the pressure relief mechanism 22 is relatively simple, which is beneficial to simplifying the overall structure of the cover 20.

[0096] In some embodiments of this application, such as Figure 12 As shown, the arrangement direction of the two protrusions 23 (i.e., the line connecting the two protrusions 23) intersects the line connecting the center points of the two electrode terminals 40 (i.e., the arrangement direction of the two electrode terminals 40, which is the length direction X of the battery cell 100). Thus, the other components covering the top of the battery cell 100 are supported not only by the two protrusions 23 but also by the two electrode terminals 40; that is, the two protrusions 23 and the two electrode terminals 40 form a four-point support structure for the other components. Therefore, by supporting other components with two protrusions 23 and two electrode terminals 40, sufficient space is provided for the pressure relief mechanism 22 to actuate. This allows the pressure relief mechanism 22 to actuate normally when thermal runaway occurs inside the battery cell 100 within the battery device 200. This also allows the flue gas generated inside the battery cell 100 due to thermal runaway to be smoothly discharged from the pressure relief mechanism 22, reducing the probability that the pressure relief mechanism 22 will be blocked by other components inside the battery device 200 and unable to actuate normally, thus improving safety.

[0097] In some embodiments of this application, the line connecting the center points of the two electrode terminals 40 is perpendicular to the line connecting the two protrusions 23. That is, the arrangement direction of the two protrusions 23 is consistent with the width direction Y of the battery cell 100. In this case, the two protrusions 23 and the two electrode terminals 40 are alternately arranged at the four corners of a rhombus, forming a four-point support for other components. By supporting other components with the two protrusions 23 and the two electrode terminals 40, sufficient space is provided for the pressure relief mechanism 22 to actuate. This allows the pressure relief mechanism 22 to actuate normally when thermal runaway occurs inside the battery cell 100 within the battery device 200. This ensures that the flue gas generated by thermal runaway inside the battery cell 100 can be smoothly discharged from the pressure relief mechanism 22, reducing the probability that the pressure relief mechanism 22 will be blocked by other components within the battery device 200 and thus improving safety.

[0098] Generally, the width of the battery cell 100 along the width direction Y is relatively small, resulting in limited available space on both sides of the pressure relief mechanism 22 of the cover body 21 along the width direction Y of the battery cell 100. Based on this, in some embodiments of this application, such as... Figures 2 to 5 As shown, the two protrusions 23 are arranged along the length X of the battery cell 100 (i.e., the line connecting the center points of the two electrode terminals 40 is parallel to the line connecting the two protrusions 23). In this embodiment, the two protrusions 23 provide sufficient space for the pressure relief mechanism 22 to operate, thus enabling the pressure relief mechanism 22 to operate normally when thermal runaway occurs inside the battery cell 100 within the battery device 200. This allows the flue gas generated inside the battery cell 100 due to thermal runaway to be smoothly discharged from the pressure relief mechanism 22, reducing the probability that the pressure relief mechanism 22 will be blocked by other components inside the battery device 200 and unable to operate normally, thereby improving safety.

[0099] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the protrusion height of the protrusion 23 relative to the surface of the cover body 21 is S1, and the protrusion height of the electrode terminal 40 relative to the surface of the cover body 21 is W1, where 0mm < W1 ≤ S1. Thus, when assembling the battery cell 100 into the battery device 200, the protrusion 23 directly abuts against other components covering the top of the battery cell 100, thereby providing sufficient actuation space for the pressure relief mechanism 22. This allows the pressure relief mechanism 22 to be smoothly actuated when thermal runaway occurs in the battery cell 100, thereby smoothly discharging the high-temperature, high-pressure flue gas inside the battery cell 100.

[0100] In some embodiments of this application, in order to improve the space utilization of the electrode assembly 30 within the receiving cavity 12, the electrode assembly 30 basically fills the receiving cavity 12. However, the battery cell 100 must also be equipped with necessary devices such as overcharge protection devices and overcurrent protection devices. In order to accommodate the necessary devices such as overcharge protection devices and overcurrent protection devices, therefore, as Figures 7 to 9 As shown, the cover 20 also includes a convex structure 24, which is disposed on the cover body 21. The convex structure 24 protrudes from the cover body 21 in a direction away from the electrode assembly 30. Thus, the internal space formed by the convex structure 24 is used to accommodate necessary devices such as overcharge protection devices and overcurrent protection devices. In the battery cell 100 of this embodiment, the convex structure 24 is spaced apart from the electrode terminals 40. Since the convex structure 24 occupies most of the area of ​​the cover body 21, both the pressure relief mechanism 22 and the protrusion 23 are disposed on the convex structure 24. Because the pressure relief mechanism 22 is disposed on the convex structure 24, when the battery cell 100 generates high-temperature and high-pressure flue gas due to thermal control, the internal space formed by the convex structure 24 can also provide a flow space for the high-temperature and high-pressure flue gas to flow smoothly to the pressure relief mechanism 22, preventing the high-temperature and high-pressure flue gas from accumulating inside the battery cell 100 and causing the casing body 10 and / or the cover body 21 to burst.

[0101] In some embodiments of this application, such as Figure 6 and Figure 9 As shown, the height of the protrusion 23 relative to the surface of the cover body 21 is S2, that is, the sum of the height of the convex structure 24 and the height of the protrusion 23 is S2. The height of the electrode terminal 40 relative to the surface of the cover body 21 is W1, where 0mm < W1 ≤ S2. Thus, when the battery cell 100 is used to assemble and produce the battery device 200, the protrusion 23 will directly abut against other components covering the top of the battery cell 100, thereby providing sufficient actuation space for the pressure relief mechanism 22. This allows the pressure relief mechanism 22 to be smoothly actuated when the battery cell 100 experiences thermal runaway, thereby smoothly discharging the high-temperature and high-pressure flue gas inside the battery cell 100.

[0102] In some embodiments of this application, such as Figure 5 As shown, the distance between the protrusion 23 and the pressure relief mechanism 22 is L, where 0mm ≤ L ≤ 50mm. This ensures that the protrusion 23 has a reasonable position relative to the pressure relief mechanism 22, allowing sufficient actuation space for the two protrusions 23 to support the pressure relief mechanism 22. In this embodiment, the distance between the protrusion 23 and the pressure relief mechanism 22 is preferably designed to be 0mm ≤ L ≤ 30mm.

[0103] In some embodiments of this application, the protrusion 23 is integrally formed with the cover body 21. Furthermore, since the two protrusions 23 are symmetrically arranged with respect to the center point of the pressure relief mechanism 22, and the cover body 20 is integrally formed using die casting or stamping processes, this helps to reduce the mold cost of the cover body 20. Preferably, the cover body 20 of the battery cell 100 provided in the embodiments of this application is manufactured using an integral stamping process, that is, the protrusion 23 and the cover body 21 are integrally formed using a stamping process.

[0104] In some other embodiments of this application, the protrusion 23 is an independent component relative to the cover body 21, and the protrusion 23 is fixedly connected to the cover body 21. Furthermore, since the two protrusions 23 are symmetrically arranged with respect to the center point of the pressure relief mechanism 22, it is beneficial to simplify the design structure, thereby improving the connection and assembly efficiency of fixing the protrusions 23 to the cover body 21.

[0105] In some embodiments of this application, the protrusion 23 of the independent component is an insulating component integrally molded from an insulating material, such as insulating plastic. Since the protrusion 23 is an insulating component, when assembling the battery cell 100 into the battery device 200, the protrusion 23 can directly contact other components inside the battery device 200 without causing a short circuit. After the protrusion 23 is integrally molded from an insulating material, it can be glued and fixed to the cover body 21, resulting in high assembly efficiency.

[0106] Alternatively, in some other embodiments of this application, such as Figure 10 and Figure 11 As shown, the protrusion 23 of the independent component includes a metal body 231 and an insulating layer 232. The insulating layer 232 can cover the end of the metal body 231 away from the cover body 21; that is, along the height direction Z, the metal body 231 and the insulating layer 232 are stacked sequentially. The metal body 231 can be connected and fixed to the cover body 21 by adhesive bonding or welding, and the insulating layer 232 is bonded and fixed to the metal body 231 by adhesive bonding. Alternatively, the insulating layer 232 can wrap around the metal body 231, and the protrusion 23 of this independent component can be bonded and fixed to the cover body 21 by adhesive bonding. In this embodiment, since the protrusion 23 is connected to other components of the battery device 200 by the insulating layer 232, the protrusion 23 can directly contact other components inside the battery device 200 without causing a short circuit.

[0107] According to a second aspect of this application, a battery device 200 is provided. For example... Figure 13As shown, the battery device 200 includes a main body 201, a cover 202, and a plurality of battery cells 100 as described above. The cover 202 covers the main body 201 to form an assembly space 203. The plurality of battery cells 100 are installed in the assembly space 203 with their height direction Z parallel to the direction from the main body 201 to the cover 202.

[0108] The battery device 200 is assembled using the battery cell 100 provided in the embodiments of this application, that is, the battery cell 100 is assembled within the assembly space 203 of the battery device 200. In the cover 20 of the battery cell 100, both the pressure relief mechanism 22 and the protrusion 23 are disposed on the cover body 21, and the protrusion 23 and the pressure relief mechanism 22 are spaced apart and close to each other. Thus, when the battery device 200 deforms due to a collision, causing thermal runaway of the battery cell 100, the protrusion 23 can support the deformed cover 202 for the pressure relief mechanism 22, providing sufficient space for the pressure relief mechanism 22 to actuate. This allows the pressure relief mechanism 22 to actuate normally when thermal runaway occurs inside the battery cell 100 within the battery device 200, enabling the fumes generated inside the battery cell 100 due to thermal runaway to be smoothly discharged from the pressure relief mechanism 22. This reduces the probability that the pressure relief mechanism 22 will be blocked by the deformed cover 202 inside the battery device 200 and unable to actuate normally, improving safety in use. Furthermore, during the normal operation of the battery device 200, the protrusion 23 can also support the cover plate of the box cover 202 when it vibrates and deforms due to external forces, air flow and other factors, so that the cover plate of the box cover 202 will not hit the pressure relief mechanism 22 of the battery cell 100 and cause the pressure relief mechanism 22 to malfunction or be damaged, thus ensuring that the pressure relief mechanism 22 can always be actuated normally.

[0109] In some embodiments of this application, such as Figures 14 to 16 As shown, the battery device 200 also includes a hub 204, and multiple battery cells 100 are arrayed in the assembly space 203. The electrode terminals 40 of two adjacent battery cells 100 are electrically connected through the hub 204. In the battery device 200, multiple battery cells 100 are connected in series, parallel, or in a mixed configuration through multiple hubs 204, so that these battery cells 100 are used to store electrical energy or provide electrical energy. The multiple battery cells 100 arrayed in the assembly space 203 can be rationally distributed to improve space utilization, thereby increasing the overall battery energy density of the battery device 200.

[0110] like Figure 5 , Figure 9 and Figure 17As shown, the thickness of the electrode plate 204 is W2, the height of the top of the protrusion 23 relative to the surface of the cover body 21 is S (when the cover body 20 does not include the protruding structure 24, S is the aforementioned S1; when the cover body 20 includes the protruding structure 24, S is the aforementioned S2), and the protrusion height of the electrode terminal 40 relative to the surface of the cover body 21 is W1, 0.5mm≤S≤W1+W2+5mm. When multiple battery cells 100 are assembled in the assembly space 203 and the electrode terminals 40 of the multiple battery cells 100 are connected in series, parallel, or mixed via the electrode plate 204, in order to ensure insulation between the electrode plate 204 and the cover 202, there is a gap between the electrode plate 204 and the cover plate 202. This gap is generally designed to be about 5mm, and an insulating material layer, such as insulating foam, can be placed in this gap to separate the electrode plate 204 from the inner wall of the cover plate 202 to achieve absolute insulation. In some embodiments of this application, S = W1 + W2 + 5mm, that is, the top surface of the protrusion 23 is higher than the top surface of the plate 204, and the top surface of the protrusion 23 is in contact with and insulated from the inner wall of the cover body 21. In this way, the protrusion 23 not only provides sufficient space for the pressure relief mechanism 22 to be actuated, but also, when the cover of the box cover 202 is affected by external forces, air flow and other factors, the protrusion 23 always supports the inner wall of the cover of the box cover 202, thereby preventing the cover of the box cover 202 from deforming and avoiding the cover of the box cover 202 from deforming and hitting the battery cell 100. In other embodiments, W1+W2≤S<W1+W2+5mm, that is, the top surface of the protrusion 23 is higher than the top surface of the plate 204, but there is a gap between the top surface of the protrusion 23 and the inner wall of the cover plate of the box cover 202. In this way, the protrusion 23 not only provides sufficient space for the pressure relief mechanism 22 to be actuated, but also, when the cover plate of the box cover 202 vibrates and deforms due to external force, air flow and other factors, the cover plate of the box cover 202 only needs to be slightly deformed and is supported by the protrusion 23, thereby reducing the amount of deformation of the cover plate of the box cover 202, preventing the box cover 202 from hitting the pressure relief mechanism 22, and reducing the hitting force of the box cover 202 on the battery cell 100, thus reducing the hitting noise. In some other embodiments, S < W1 + W2, that is, the top surface of the protrusion 23 is lower than the top surface of the plate 204. In this way, the protrusion 23 can provide sufficient space for the pressure relief mechanism 22 to be actuated. Furthermore, when the cover plate of the box cover 202 vibrates and deforms due to external forces, air flow and other factors, the protrusion 23 can reduce the impact force of the box cover 202 on the battery cell 100 to a certain extent and reduce the impact noise.

[0111] In some embodiments of this application, when the cover 20 of the battery cell 100 includes a convex structure 24 and both the pressure relief mechanism 22 and the protrusion 23 are disposed on the convex structure 24, the protrusion height of the protrusion 23 relative to the surface of the cover body 21 is the sum of the height of the convex structure 24 relative to the cover body 21 and the height of the protrusion 23 itself. Furthermore, the height of the convex structure 24 relative to the cover body 21 is generally less than the protrusion height of the electrode terminal 40 relative to the surface of the cover body 21.

[0112] In some embodiments of this application, when the protrusion 23 is a conductive structure, that is, when the protrusion 23 and the cover body 21 are integrally formed by stamping, the battery device 200 further includes an insulating patch 205, which is attached to the top of the protrusion 23 away from the cover body 21. When the cover plate of the box cover 202 vibrates and deforms due to external forces, air flow, or other factors, the insulating patch 205 provides insulation between the protrusion 23 and the inner wall of the cover plate of the box cover 202. While supporting the box cover 202, the protrusion 23 can ensure that a short circuit does not occur between the protrusion 23 and the box cover 202.

[0113] In some embodiments of this application, the insulating patch 205 is provided in a one-to-one correspondence with the protrusion 23. This ensures that each protrusion 23 in the battery device 200 is insulated from the inner wall of the cover plate of the box cover 202, and guarantees that no short circuit will occur between the protrusion 23 and the box cover 202.

[0114] Alternatively, in some other embodiments of this application, such as Figures 18 to 20 As shown, when multiple battery cells 100 are arranged in an array in the assembly space 203, the pressure relief mechanisms 22 of the multiple battery cells 100 in the same column are arranged in a straight line. An insulating patch 205 is attached to the protrusion 23, covering multiple battery cells 100 along the arrangement direction of the battery cells 100 in the same column. In this way, while ensuring that each protrusion 23 in the battery device 200 is insulated from the inner wall of the cover plate of the box cover 202, the number of insulating patches 205 is reduced, which facilitates the assembly of the insulating patches 205 and improves the assembly efficiency.

[0115] During the assembly and production of the battery device 200, due to assembly tolerances, the insulating patch 205 can either have a gap between it and the inner wall of the cover plate of the casing 202, or the insulating patch 205 can be in contact with the inner wall of the casing 202. The assembly method where the insulating patch 205 is in contact with the inner wall of the casing 202 can maximize the optimization of the overall space utilization of the battery device 200 and improve the battery energy density.

[0116] In some embodiments of this application, when the protrusion 23 is an insulating structure, that is, when the protrusion 23 is an independent insulating component, or when the protrusion 23 includes a metal body 231 and an insulating layer 232, the top of the protrusion 23 away from the cover body 21 contacts the inner wall of the cover 202. In this case, the insulating layer 232 of the protrusion 23 replaces the aforementioned insulating patch 205 to achieve the insulation effect. This maximizes the optimization and reduction of the overall space utilization of the battery device 200 and improves the battery energy density.

[0117] According to a third aspect of the embodiments of this application, embodiments of this application also provide an electrical device 400, which includes an electrical load 401.

[0118] Electrical equipment 400 includes, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys may include, but are not limited to, stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include, but are not limited to, airplanes, rockets, space shuttles, and spacecraft.

[0119] In some embodiments of this application, the electrical device 400 further includes a battery device 200 as described above, that is, the electrical device 400 uses one battery device 200 or multiple battery devices 200 connected in series, parallel or mixed. The battery device 200 is used to store electrical energy or to provide electrical energy to the electrical load 401, thereby enabling the electrical load 401 to operate normally.

[0120] Alternatively, in some other embodiments of this application, the electrical device 400 may further include a plurality of battery cells 100 as described above, that is, the electrical device 400 uses a plurality of battery cells 100 connected in series, parallel or mixed. The battery cells 100 are used to store electrical energy or to provide electrical energy to the electrical load 401, thereby enabling the electrical load 401 to operate normally.

[0121] Among them, the electrical equipment 400 is an electric vehicle, and it is assembled using a battery device 200, such as Figure 21As shown, the battery device 200 is mounted on the frame 403 of the electric vehicle. The electric vehicle includes the frame 403, a drive motor, and wheels 404. The battery device 200 and the drive motor are both fixedly mounted on the frame 403, and the wheels 404 are rotatably connected to the frame 403. The battery device 200 is electrically connected to the drive motor, and the drive motor is driven by the wheels 404. Using the battery device 200 provided in this application as the drive motor (the drive motor is one of the electrical loads 401 of the electrical equipment 400), the drive motor drives the wheels 404 to rotate, enabling the electric vehicle to drive normally. Furthermore, the electric vehicle includes a control device 402, which is mounted on the frame 403 and electrically connected to the battery device 200. The control device 402 is used to control and monitor the charging and discharging status of the battery device 200. In some electric vehicles, the battery housing of the battery device 200 can be part of the chassis structure of the electric vehicle. For example, a portion of the battery box can be at least part of the floor of the electric vehicle, or a portion of the battery box can be at least part of the crossbeams and longitudinal beams of the electric vehicle.

[0122] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, The battery cell includes: The shell body has an open end; A cover body, which closes to the opening end, forms a receiving cavity for accommodating the electrode assembly with the shell body. The cover body includes a cover body and a pressure relief mechanism, which is disposed on the cover body. The cover also includes at least one protrusion, which is located on the side of the cover away from the electrode assembly and is located beside the pressure relief mechanism.

2. The battery cell according to claim 1, characterized in that, The cover includes a plurality of protrusions, which are spaced apart around the pressure relief mechanism.

3. The battery cell according to claim 1, characterized in that, The cover includes two protrusions, which are located on opposite sides of the pressure relief mechanism.

4. The battery cell according to claim 3, characterized in that, The two protrusions are symmetrically arranged with respect to the center point of the pressure relief mechanism.

5. The battery cell according to any one of claims 1-4, characterized in that, The battery cell also includes an electrode terminal for electrical connection with the electrode assembly. At least one electrode terminal is mounted on the cover body, and the protrusion is spaced apart from the electrode terminal.

6. The battery cell according to claim 5, characterized in that, Two electrode terminals are installed on the cover body. The two electrode terminals are located on both sides of the pressure relief mechanism, and the line connecting the center points of the two electrode terminals intersects the protrusion.

7. The battery cell according to claim 6, characterized in that, At least one of the protrusions is provided between each of the electrode terminals and the pressure relief mechanism.

8. The battery cell according to claim 7, characterized in that, The two electrode terminals are symmetrically arranged with respect to the center point of the pressure relief mechanism.

9. The battery cell according to claim 5, characterized in that, The cover body is equipped with two electrode terminals, which are located on both sides of the pressure relief mechanism. The cover body includes two protrusions, and the line connecting the center points of the two electrode terminals intersects the line connecting the two protrusions.

10. The battery cell according to claim 9, characterized in that, The line connecting the center points of the two electrode terminals is perpendicular to the line connecting the two protrusions.

11. The battery cell according to claim 5, characterized in that, The protrusion height of the protrusion relative to the surface of the cover body is S1, and the protrusion height of the electrode terminal relative to the surface of the cover body is W1, where 0mm < W1 ≤ S1.

12. The battery cell according to claim 5, characterized in that, The cover also includes a convex structure, which is disposed on the cover body. The convex structure protrudes from the cover body in a direction away from the electrode assembly. The convex structure is spaced apart from the electrode terminal. The pressure relief mechanism and the protrusion are both disposed on the convex structure.

13. The battery cell according to claim 12, characterized in that, The height of the protrusion relative to the surface of the cover body is S2, and the height of the electrode terminal relative to the surface of the cover body is W1, where 0mm < W1 ≤ S2.

14. The battery cell according to any one of claims 1-4, characterized in that, The distance between the protrusion and the pressure relief mechanism is L, where 0mm ≤ L ≤ 50mm.

15. The battery cell according to any one of claims 1-4, characterized in that, The protrusion is integrally formed with the cover body.

16. The battery cell according to any one of claims 1-4, characterized in that, The protrusion is an independent component relative to the cover body, and the protrusion is fixedly connected to the cover body.

17. The battery cell according to claim 16, characterized in that, The protrusion is an insulating component integrally molded from insulating material.

18. The battery cell according to claim 16, characterized in that, The protrusion includes a metal body and an insulating layer, wherein the insulating layer covers the end of the metal body away from the cover body, or the insulating layer wraps around the metal body.

19. A battery device, characterized in that, include: Box body; A lid that fits onto the box body to form an assembly space; as well as A plurality of battery cells as described in any one of claims 1-18, wherein the plurality of battery cells are mounted in the assembly space; The protrusion faces the inner wall of the box lid.

20. The battery device according to claim 19, characterized in that, The battery device further includes a plate, and there are multiple battery cells arranged in an array in the assembly space. The electrode terminals of two adjacent battery cells are electrically connected through the plate. The thickness of the plate is W2, the height of the top of the protrusion relative to the surface of the cover body is S, and the protrusion height of the electrode terminal relative to the surface of the cover body is W1, where 0.5mm≤S≤W1+W2+5mm.

21. The battery device according to claim 19 or 20, characterized in that, The protrusion is a conductive structure, and the battery device also includes an insulating patch attached to the top of the protrusion away from the cover body.

22. The battery device according to claim 21, characterized in that, The insulating patch is provided in a one-to-one correspondence with the protrusion; Alternatively, one of the insulating patches may cover the top of the protrusions of the plurality of battery cells.

23. The battery device according to claim 21, characterized in that, The insulating patch is in contact with the inner wall of the box cover.

24. The battery device according to claim 19 or 20, characterized in that, The protrusion is an insulating structure, and the top of the protrusion away from the cover body contacts the inner wall of the box cover.

25. An electrical appliance, characterized in that, Including electrical loads; The electrical equipment further includes a plurality of battery cells as described in any one of claims 1-18, wherein the plurality of battery cells are electrically connected, and the battery cells are used to store electrical energy or to supply power to the electrical load. Alternatively, the electrical equipment may further include a battery device as described in any one of claims 19-24, the battery device being used to store electrical energy or to supply power to the electrical load.

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