Battery monomer, battery and electric device

Abstract

The invention discloses a battery monomer, a battery and an electric device, which can improve the pressure relief capability of the battery monomer. The battery cell comprises: an electrode assembly; the end cover assembly comprises an end cover and an insulating part located between the end cover and the electrode assembly, a pressure relief mechanism is arranged on the end cover, a second discharge hole is formed in the position, corresponding to the pressure relief mechanism, of the insulating part, and the second discharge hole penetrates through the insulating part in the thickness direction of the end cover assembly; the electrode assembly comprises an insulating part and a pressure relief mechanism, the supporting part is arranged between the insulating part and the electrode assembly, a first discharge hole is formed in the position, corresponding to the pressure relief mechanism, of the supporting part, and the first discharge hole penetrates through the supporting part in the thickness direction.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. The battery is composed of battery cells, and the battery cells are equipped with a pressure relief mechanism to release the internal pressure. How to improve the pressure relief capacity of battery cells has become an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the pressure relief capability of the battery cell.

[0004] In a first aspect, a battery cell is provided, comprising: an electrode assembly; an end cap assembly, comprising an end cap, and an insulating member located between the end cap and the electrode assembly, the end cap being provided with a pressure relief mechanism, a second discharge hole being provided on the insulating member at a position corresponding to the pressure relief mechanism, and the second discharge hole penetrating the insulating member along a thickness direction of the end cap assembly; and a support member, provided between the insulating member and the electrode assembly, a first discharge hole being provided on the support member at a position corresponding to the pressure relief mechanism, and the first discharge hole penetrating the support member along the thickness direction.

[0005] In the embodiment of the present application, the battery cell releases its internal pressure through the pressure relief mechanism on its end cap assembly. A support is provided between the end cap assembly and the electrode assembly, which can play a supporting role between the electrode assembly and the end cap assembly, especially for an inverted battery cell, the electrode assembly can be supported, so that the gravity of the electrode assembly is not easily transmitted to the pole ear and causes risks. The support is located between the insulating member in the end cap assembly and the electrode assembly, and a second discharge hole penetrating the insulating member is provided at a position corresponding to the pressure relief mechanism on the insulating member, and a first discharge hole penetrating the support is provided at a position corresponding to the pressure relief mechanism on the support, so that the gas and other emissions inside the battery cell pass through the first discharge hole on the support and the second discharge hole on the insulating member, and are discharged to the outside of the battery cell through the pressure relief mechanism to achieve pressure relief, thereby improving the pressure relief capacity of the battery cell. At the same time, the first discharge hole can also play a role in reducing the weight of the support.

[0006] In some possible implementations, the projection of the first discharge hole on a plane perpendicular to the thickness direction does not overlap with the projection of the second discharge hole on the plane. In this way, the total discharge area can be increased and the discharge efficiency can be improved. For example, the projection of the second discharge hole on the plane can surround the projection of the first discharge hole on the plane.

[0007] The projection of the second discharge hole on the plane perpendicular to the thickness direction may be, for example, an annular shape, which may be, for example, a circular or elliptical ring. The second discharge hole is set to be annular, so that the gas and other emissions inside the battery cell can be uniformly discharged in all directions within a limited area, and has better discharge performance.

[0008] In some possible implementations, the projection of the first discharge hole on a plane perpendicular to the thickness direction overlaps at least partially with the projection of the second discharge hole on the plane. In this way, the discharge path between the first discharge hole and the second discharge hole can be shortened, so that the gas and other discharges inside the battery cell can reach the pressure relief mechanism through the second discharge hole on the insulating member as soon as possible after passing through the first discharge hole on the support member, and be discharged from the pressure relief mechanism, so as to achieve effective pressure relief and improve the discharge efficiency.

[0009] For example, the first discharge hole includes a first sub-discharge hole and a second sub-discharge hole, the projection of the second discharge hole on the plane surrounds the projection of the first sub-discharge hole on the plane, and the projection of the second sub-discharge hole on the plane overlaps with the projection of the second discharge hole on the plane. By providing the first sub-discharge hole and the second sub-discharge hole, the discharge area is increased, the discharge path is shortened, and the discharge efficiency is improved.

[0010] In some possible implementations, the projection of the second discharge hole on a plane perpendicular to the thickness direction is a ring, and the radial size of the ring is smaller than or equal to the radial size of the second sub-discharge hole, thereby reducing the obstruction of the second discharge hole by the first discharge hole, which is beneficial to the discharge performance.

[0011] In some possible implementations, the area of ​​the first sub-discharge hole is greater than or equal to the area of ​​the second sub-discharge hole. Setting the area of ​​the first sub-discharge hole to be greater than the area of ​​the second sub-discharge hole can fully utilize the area of ​​the area on the support member corresponding to the inner area surrounded by the second discharge hole, thereby improving the discharge efficiency and helping to reduce the weight of the support member.

[0012] In some possible implementations, a first protrusion that is protruded toward the support member is disposed on the insulating member, and the second discharge hole is at least partially located on the first protrusion.

[0013] The first protrusion is provided on the insulating member, which can increase the contact area between the insulating member and the thin film material on the surface of the electrode assembly, facilitate the connection between the insulating member and the thin film material, and improve the connection reliability. At the same time, the protrusion on the insulating member can cooperate with the concave portion provided at the corresponding position on the support member, thereby improving the connection reliability between the insulating member and the support member.

[0014] In some possible implementations, a step is provided at an end of the first protrusion along the width direction of the end cover assembly, and a notch is formed inwardly along the side of the support member along the length direction of the end cover assembly to avoid the step.

[0015] In this implementation, the first protrusion of the support member is provided with a step along the width direction of its end cover assembly, and a notch is formed inwardly on the side of the support member along the length direction of the end cover assembly to avoid the step, and the portion of the support member corresponding to the first protrusion can be accommodated in the step, so that the assembled support member is flush with the surface of the insulating member.

[0016] In some possible implementations, a gap is provided between an edge of the step and an edge of the notch along the width direction, and the gap is used to avoid a portion of the second discharge hole provided along the edge of the step.

[0017] A certain gap is set between the edge of the step on the insulating member and the notch on the support member for avoiding the step, which can avoid the part of the second discharge hole on the insulating member set along the edge of the step, reduce the obstruction of the second discharge hole by the support member, and is conducive to improving the discharge performance.

[0018] In some possible implementations, the size of the notch in the length direction is greater than or equal to the size of the portion of the second discharge hole arranged along the edge of the step in the length direction. The notch can completely avoid the portion of the second discharge hole on the insulating member located at the edge of the step in the length direction of the end cap assembly, so that the support member blocks the second discharge hole to a minimum or even does not block it in the length direction, further improving the discharge performance.

[0019] In some possible implementations, the support member includes a main body portion and a second protrusion portion protruding along the main body portion toward the electrode assembly, the main body portion is used to support the pole ear of the electrode assembly, the second protrusion portion is used to support the non-pole ear area on the end face of the electrode assembly, and the first discharge hole is located on the second protrusion portion.

[0020] Since the tab of the electrode assembly is protrudingly arranged on the end face of the electrode assembly facing the support member, the main body of the support member can be attached to the tab to support the tab, and the second protrusion on the support member protruding along the main body toward the electrode assembly can be attached to the end face of the electrode assembly to support the end face. The tab and the end face are supported by the main body and the second protrusion respectively, thereby improving the support reliability. The first discharge hole on the support member can be arranged on the second protrusion of the support member and opposite to the pressure relief mechanism of the battery cell, which is conducive to the discharge of the internal pressure of the battery cell.

[0021] In some possible implementations, the support member is further provided with an opening penetrating the support member, and the opening is located at the intersection of the main body and the second protrusion. The opening can be used to avoid the first protrusion provided at a position on the insulating member corresponding to the second protrusion, and can also reduce the weight of the support member.

[0022] In some possible implementations, on a plane perpendicular to the thickness direction of the end cap assembly, the projection of the opening covers the portion of the projection of the second discharge hole that is not covered by the projection of the second protrusion. The opening can effectively avoid at least part of the position of the second discharge hole, reduce the shielding of the second discharge hole by the support, and help improve the discharge performance.

[0023] In some possible implementations, a hook portion is provided at the end of the support member in the length direction of the end cap assembly, and the hook portion is hooked and matched with the insulating member to connect the support member and the end cap assembly. By providing the hook portion at the end of the support member, the connection between the support member and the insulating member can be simply and reliably achieved.

[0024] In a second aspect, a battery is provided, comprising the battery cell described in the first aspect or any possible implementation manner of the first aspect.

[0025] In a third aspect, an electrical device is provided, comprising the battery described in the second aspect or any possible implementation of the second aspect, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the structure of a vehicle according to an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the structure of a battery according to an embodiment of the present application.

[0029] Figure 3 It is a schematic diagram of the structure of a battery cell according to an embodiment of the present application.

[0030] Figure 4 It is a schematic structural diagram of the end cover assembly of an embodiment of the present application.

[0031] Figure 5 It is a schematic structural diagram of the insulating member and the supporting member before assembly according to an embodiment of the present application.

[0032] Figure 6 It is a schematic diagram of the insulating member and the supporting member after assembly according to an embodiment of the present application.

[0033] Figure 7 It is a partial cross-sectional view of a battery cell according to an embodiment of the present application.

[0034] Figure 8 It is a partial top view of the insulating member of the embodiment of the present application.

[0035] Fig. 9 It is a partial top view of the insulating member and the supporting member after assembly according to the embodiment of the present application.

[0036] Fig.10 It is a partial top view of the insulating member and the supporting member after assembly according to one embodiment of the present application.

[0037] Fig.11 It is a partial top view of the insulating member and the supporting member after assembly according to another embodiment of the present application.

[0038] Fig.12 It is a schematic structural diagram of the insulating member and the supporting member before assembly according to an embodiment of the present application.

[0039] Fig.13 It is a partial top view of the insulating member and the supporting member after assembly according to the embodiment of the present application.

[0040] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0043] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0045] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0046] The term "multiple" as used in the present application refers to two or more than two. Similarly, the term "multiple groups" refers to two or more than two groups, and the term "multiple sheets" refers to two or more than two sheets.

[0047] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. The battery cell may be, for example, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0048] A battery cell usually includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions such as lithium ions are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0049] In some embodiments, the positive electrode may be a positive electrode sheet, which includes a positive electrode collector and a positive electrode active material disposed on at least one surface of the positive electrode collector.

[0050] The positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0051] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0052] Among them, the positive electrode active material includes, for example, at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. The present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphates such as LiFePO4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphates such as LiMnPO4, composite materials of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and at least one of composite materials of lithium iron manganese phosphate and carbon.

[0053] In some embodiments, the negative electrode may be a negative electrode sheet, which includes a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0054] The negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0055] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0056] The negative electrode active material includes, for example, at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like.

[0057] In some embodiments, the negative electrode may also be a foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. It should be noted that when the foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not be provided with a negative electrode active material.

[0058] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0059] The material of the positive electrode current collector may be, for example, aluminum, and the material of the negative electrode current collector may be, for example, copper.

[0060] The separator in the electrode assembly is disposed between the positive electrode and the negative electrode. In some embodiments, the separator is a separator. The present application does not limit the type of separator, and any porous structure separator with good chemical stability and mechanical stability can be selected. For example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0061] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0062] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application does not limit the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0063] In the embodiment of the present application, the electrode assembly may be a winding structure, wherein the positive electrode sheet and the negative electrode sheet are wound to form a winding structure. The electrode assembly may also be a laminated structure, for example, the positive electrode sheet and the negative electrode sheet may be provided in a plurality, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked. Alternatively, the positive electrode sheet may be provided in a plurality, and the negative electrode sheet may be folded to form a plurality of stacked folded sections, with a positive electrode sheet sandwiched between adjacent folded sections; or, both the positive electrode sheet and the negative electrode sheet may be folded to form a plurality of stacked folded sections.

[0064] There may be a plurality of separators, each of which is disposed between any adjacent positive electrode sheets and negative electrode sheets.

[0065] In some embodiments, the separator may be disposed continuously and disposed between any adjacent positive electrode sheets and negative electrode sheets by folding or winding.

[0066] The shape of the electrode assembly can be, for example, cylindrical, flat, or polygonal. The electrode assembly can be provided with a tab, which is used to conduct current from the electrode assembly. The tab includes a positive tab and a negative tab.

[0067] In some embodiments, the battery cell includes a shell. The shell is used to encapsulate components such as electrode assemblies and electrolytes. The shell can be a steel shell, an aluminum shell, a plastic shell such as polypropylene, a composite metal shell such as a copper-aluminum composite shell, or an aluminum-plastic film. The shell includes a box body and a cover plate.

[0068] The battery cells may be, for example, cylindrical battery cells, prismatic battery cells, soft-pack battery cells or battery cells of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells or polygonal prismatic batteries, among which the polygonal prismatic batteries may be hexagonal prismatic batteries, etc. This application does not impose any restrictions on this.

[0069] The battery described in the embodiments of the present application may be a single physical module including one or more battery cells to provide higher voltage and capacity. In the case of multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0070] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0071] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0072] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the vehicle floor, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0073] The battery cells in the battery usually release their internal pressure through the pressure relief mechanism on their end cover assembly to reduce the risk of thermal runaway of the battery. A support member can be set between the end cover assembly and the electrode assembly to play a supporting role, but the support member will affect the release of the internal pressure of the battery cell.

[0074] In view of this, the present application provides a battery cell, by setting a discharge hole at a position corresponding to the pressure relief mechanism on the support member, so that the gas and other emissions inside the battery cell pass through the discharge hole and are discharged from the pressure relief mechanism to achieve effective pressure relief.

[0075] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0076] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0077] For example, Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 30, a controller 20 and a battery 10 may be arranged inside the vehicle 1. The controller 20 is used to control the battery 10 to supply power to the motor 30. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0078] In order to meet different power usage requirements, the battery may include multiple different types of battery cells. Multiple battery cells can be connected in series, in parallel or in a mixed manner according to the type of battery cells to form multiple battery cell groups, and the multiple battery cell groups are then connected in series to form a battery, wherein the mixed connection is a mixture of series and parallel connections. Multiple different battery cells can also be directly connected in series, in parallel or in a mixed manner to form a battery. In other words, multiple battery cells can directly form a battery, or they can first form a battery cell group according to the type of battery cells, and then form a battery from the battery cell group.

[0079] Figure 2 A schematic diagram of the structure of a battery 10 according to an embodiment of the present application is shown, and the battery 10 may include a plurality of battery cells (not shown in the figure). The battery 10 may also include a housing (or cover) 110, the interior of the housing 110 is a hollow structure, and a plurality of battery cells are accommodated in the housing 110. The housing 110 may include two parts, which are respectively referred to as a first housing portion 111 and a second housing portion 112, and the first housing portion 111 and the second housing portion 112 are buckled together. The shapes of the first housing portion 111 and the second housing portion 112 may be determined according to the shapes of the combination of the plurality of battery cells, and at least one of the first housing portion 111 and the second housing portion 112 has an opening.

[0080] For example, Figure 2 As shown, only one of the first box body 111 and the second box body 112 is a hollow cuboid with an opening, while the other is in the shape of a plate to cover the opening. Here, taking the second box body 112 as a hollow structure with only one face as an opening face, and the first box body 111 as a plate as an example, the first box body 111 covers the opening of the second box body 112 to form a box body 110 with a closed chamber, which can be used to accommodate multiple battery cells. After multiple battery cells are connected in parallel, in series, or in a mixed combination, they are placed in the box body 110 formed by buckling the first box body 111 and the second box body 112.

[0081] For example, unlike Figure 2 As shown, the first box body 111 and the second box body 112 can both be hollow structures and each have only one open surface, the openings of the first box body 111 and the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 110 with a closed chamber. After multiple battery cells are connected in parallel, in series or in mixed series, they are placed in the box body 110 formed by the buckling of the first box body 111 and the second box body 112.

[0082] In addition, the battery 10 may also include other structures, for example, the battery may also include a signal transmission component. The signal transmission component may be used to transmit signals such as the voltage and / or temperature of the battery cell. The signal transmission component may include a wiring harness board, which may include, for example, a temperature sensor and a voltage sampling line, etc., for measuring and transmitting information such as the voltage, current and temperature of the battery, and realizing safe management of the battery by communicating with the BMS.

[0083] In some embodiments, the signal transmission component may also include a busbar component, which is used to realize electrical connection between multiple battery cells, such as parallel, series or mixed connection. The busbar component can realize electrical connection between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the busbar component can be fixed to the electrode terminals of the battery cells by welding. The busbar component transmits the voltage of the battery cell. After multiple battery cells are connected in series, a higher voltage will be obtained. Accordingly, the electrical connection formed by the busbar component can also be called a "high voltage connection".

[0084] In some embodiments, the busbar and the wiring harness plate are encapsulated in an insulating layer to form a signal transmission assembly, also known as a CCS assembly, wherein the signal transmission assembly has no insulating layer at the connection with the electrode terminal of the battery cell, that is, the insulating layer has an opening at this location so as to connect with the electrode terminal of the battery cell.

[0085] As an example, Figure 3 The schematic diagram of the structure of a battery cell 120 of an embodiment of the present application is shown, and the battery cell 120 includes an electrode assembly 121, an end cap assembly 122 and a support member 123. Among them, a pressure relief mechanism 124 is provided on the end cap assembly 122. The support member 123 is provided between the end cap assembly 122 and the electrode assembly 121, and a first discharge hole 1231 is provided on the support member 123 at a position corresponding to the pressure relief mechanism 124, and penetrates the support member 123 along the thickness direction Z of the end cap assembly 122.

[0086] like Figure 3 As shown, the surface of the electrode assembly 121 may be covered with a film material 126, such as a polyester film (mylar). The housing 125 of the battery cell 120 is used to accommodate the electrode assembly 121, and the end cap assembly 122 is used to cover the electrode assembly 121 in the housing 125. The thickness direction Z of the end cap assembly 122 is perpendicular to the end surface 1212 where the upper tab 1211 of the electrode assembly 121 is located.

[0087] The first discharge hole 1231 penetrates the support member 123 along the thickness direction Z. That is, the first discharge hole 1231 is a through hole of the support member 123 along the thickness direction Z.

[0088] Optionally, the battery cell 120 can be an inverted battery cell, that is, when the battery 10 is set in an electrical device, the electrode terminals of the battery cell 120 are facing away from the passengers. At this time, the end cover assembly 122 is located below the electrode assembly 121. A support member 123 is provided between the end cover assembly 122 and the electrode assembly 121 to support the electrode assembly 121, so that the gravity of the electrode assembly 121 is not easily transmitted to the pole ear 1211 and cause risks.

[0089] The battery cell 120 releases its internal pressure through the pressure relief mechanism 124 on its end cap assembly 122, and a first discharge hole 1231 penetrating the support member 123 is provided at a position corresponding to the pressure relief mechanism 124 on the support member 123, so that the gas and other emissions inside the battery cell 120 pass through the first discharge hole 1231 and are discharged from the pressure relief mechanism 124, so as to achieve effective pressure relief, thereby improving the pressure relief capacity of the battery cell 120. At the same time, the first discharge hole 1231 can also play a role in reducing weight.

[0090] The end cap assembly 122 includes an end cap 1221 and an insulating member 1222. The end cap 1221 and the housing 125 may be two independent components or may be integrally formed. The pressure relief mechanism 124 is provided at the end cap 1221. The pressure relief mechanism 124 may also be referred to as an explosion-proof valve, which is used to discharge high-temperature and high-pressure emissions from the battery cell 120 when thermal runaway occurs in the battery cell 120, such as electrolyte, dissolved or split fragments of positive and negative pole pieces or separators, high-temperature and high-pressure gases or flames generated by the reaction, etc. These emissions may cause at least a portion of the pressure relief mechanism 124 to rupture, melt, split, etc., i.e., open the valve, and thus be discharged to the outside of the battery cell 120 through the pressure relief mechanism 124. The pressure relief mechanism 124 and the end cap 1221 may be connected, for example, by welding, and the surface of the pressure relief mechanism may be covered with a film layer 1241.

[0091] In some embodiments, Figure 4As shown, a second discharge hole 1223 is provided on the insulating member 1222 at a position corresponding to the pressure relief mechanism 124, and the second discharge hole 1223 penetrates the insulating member 1222 along the thickness direction Z. By providing the second discharge hole 1223 penetrating the insulating member 1222 at a position corresponding to the pressure relief mechanism 124 on the insulating member 1222, and providing the first discharge hole 1231 penetrating the support member 123 at a position corresponding to the pressure relief mechanism 124 on the support member 123, the gas and other exhaust materials inside the battery cell 120 can pass through the first discharge hole 1231 on the support member 123 and the second discharge hole 1223 on the insulating member 1222, and be discharged from the pressure relief mechanism 124 to the outside of the battery cell 120 to achieve pressure relief, thereby improving the pressure relief capacity of the battery cell 120. Generally, the insulating member 1222 can also be called the lower plastic, which is used to isolate the electrical connection components in the housing 125 from the end cover 1221 to reduce the risk of short circuit. The insulating member 1222 can be made of materials such as plastic and rubber.

[0092] The insulating member 1222 is disposed between the end cover 1221 and the support member 123, and the insulating member 1222 and the support member 123 are connected. Figure 5 As shown, the end of the support member 123 located in the length direction Y of the end cover assembly 122 is provided with a hook portion 1232, and the hook portion 1232 is hooked and matched with the insulating member 1222 to connect the support member 123 and the end cover assembly 122. By providing the hook portion 1232 at the end of the support member 123, the connection between the support member 123 and the insulating member 1222 can be conveniently achieved.

[0093] In some embodiments, Figure 5 As shown, the insulating member 1222 is provided with a first protrusion 12221 protruding toward the support member 123, and the second discharge hole 1223 is at least partially located on the first protrusion 12221. The first protrusion 12221 is provided on the insulating member 1222, which can increase the contact area between the insulating member 1222 and the film material 126 on the surface of the electrode assembly 121, facilitate the connection between the insulating member 1222 and the film material 126, and improve the connection reliability. Figure 5 As shown, the support member 123 may form a recess 1233 , and the first protrusion 12221 on the insulating member 1222 may cooperate with the recess 1233 on the support member 123 to improve the connection reliability between the insulating member 1222 and the support member 123 .

[0094] In some embodiments, Figure 5 As shown, a step 12222 is provided at the end of the first protrusion 12221 along the width direction X of the end cover assembly 122 , and a notch 1234 is formed inwardly along the side edge of the support member 123 along the length direction Y of the end cover assembly 122 for avoiding the step 12222 .

[0095] After the support member 123 and the insulating member 1222 are assembled, Figure 6 and Figure 7 As shown, Figure 6 This is a three-dimensional diagram after the support member 123 and the insulating member 1222 are assembled. Figure 7 It is a partial cross-sectional view of the support member 123 and the insulating member 1222 after assembly. The recess 1233 of the support member 123 can accommodate the portion of the first protrusion 12221 of the insulating member 1222 located between the steps 12222, and the support member 123 is accommodated in the steps 12222, so that the bottom surface of the support member 123 after assembly is flush with the bottom surface of the insulating member 1222.

[0096] In some embodiments, along the width direction X, a gap D is provided between the edge of the step 12222 and the edge of the notch 1234 , and the gap D is used to avoid a portion of the second discharge hole 1223 provided along the edge of the step 12222 .

[0097] For example, Figure 8 and Fig. 9 As shown, Figure 8 is a schematic diagram of the size of the insulating member 1222, Fig. 9 is a schematic diagram of the dimensions of the insulating member 1222 and the supporting member 123 after being assembled, Fig. 9 The support member 123 shown in the figure forms a notch 1234 inwardly along the side edge of the end cover assembly 122 in the length direction Y to avoid the step 12222, and a gap D is provided between the edge of the step 12222 and the edge of the notch 1234. Figure 8 From the size of the insulating member 1222 , it can be seen that along the width direction X, the width W2 of the position where the notch 1234 of the support member 123 is located is less than or equal to the minimum width W1 of the second discharge hole 1223 of the insulating member 1222 , that is, W2≤W1.

[0098] Therefore, the notch 1234 on the support member 123 can avoid the portion of the second discharge hole 1223 on the insulating member 1222 that is arranged along the edge of the step 12222, thereby reducing the shielding of the second discharge hole 1223 by the support member 123, which is beneficial to improving the discharge performance.

[0099] In some embodiments, Figure 8 and Fig. 9As shown, the dimension L2 of the notch 1234 in the length direction Y is greater than or equal to the dimension L1 of the portion of the second discharge hole 1223 disposed along the edge of the step 12222 in the length direction Y, that is, L2 ≥ L1. In this way, the notch 1234 can completely avoid the portion of the second discharge hole 1223 on the insulating member 1222 located at the edge of the step 12222 in the length direction Y of the end cap assembly 122, so that the support member 123 has minimal or no shielding on the portion of the second discharge hole 1223 disposed along the edge of the step 12222 in the length direction, further improving the discharge performance.

[0100] Optionally, the sharp corners of the notch 1234 may be rounded, for example, Fig. 9 As shown, the fillet R can be smaller than W2 / 2 to facilitate the implementation of the process, such as 0.01≤R≤(W2 / 2)-2, all in millimeters.

[0101] In some embodiments, a projection of the first discharge hole 1231 on a plane perpendicular to the thickness direction Z and a projection of the second discharge hole 1223 on the plane do not overlap, or at least partially overlap.

[0102] When the projection of the first discharge hole 1231 on the plane perpendicular to the thickness direction Z does not overlap with the projection of the second discharge hole 1223 on the plane, the total discharge area can be increased and the discharge efficiency can be improved. When the projection of the first discharge hole 1231 on the plane perpendicular to the thickness direction Z is at least partially between the projection of the second discharge hole 1223 on the plane, the discharge path between the first discharge hole 1231 and the second discharge hole 1223 can be shortened, so that the gas and other emissions inside the battery cell 120 can reach the pressure relief mechanism 124 through the second discharge hole 1223 on the insulating member 1222 as soon as possible after passing through the first discharge hole 1231 on the support member 123, and be discharged from the pressure relief mechanism 124, so as to achieve effective pressure relief and improve the discharge efficiency.

[0103] It can be understood that when the first discharge hole 1231 and the second discharge hole 1223 do not overlap, although the support member 123 and the insulating member 1222 can be connected together by buckling or the like, there may be a certain gap between the support member 123 and the insulating member 1222. In particular, when the battery cell 120 has thermal runaway, the pressure inside the battery cell 120 may cause the insulating member 1222 to deform, thereby increasing the gap between the support member 123 and the insulating member 1222. Therefore, the pressure inside the battery cell 120 will pass through the first discharge hole 1231 on the support member 123 and the second discharge hole 1223 on the insulating member 1222 and then be discharged from the pressure relief mechanism 124 to the outside of the battery cell 120. In this way, even if the first discharge hole 1231 and the second discharge hole 1223 do not overlap, the first discharge hole 1231 and the second discharge hole 1223 can still achieve the corresponding discharge function.

[0104] In some embodiments, for example, Figure 8 and Fig. 9 As shown, the second discharge hole 1223 can be set to be annular, that is, the projection of the second discharge hole 1223 on a plane perpendicular to the thickness direction Z is annular, so that the gas and other emissions inside the battery cell 120 can be uniformly discharged in all directions within a limited area, with better discharge performance. The ring can be, for example, a circular or elliptical ring.

[0105] As an example, Fig. 9 A possible position of the first discharge hole 1231 is shown, and the projection of the second discharge hole 1223 on the plane perpendicular to the thickness direction Z surrounds the projection of the first discharge hole 1231 on the plane. Taking the annular second discharge hole 1223 as an example, the first discharge hole 1231 can be set at a position on the support member 123 corresponding to the inner area surrounded by the annular shape, so that the projection of the first discharge hole 1231 on the plane perpendicular to the thickness direction Z and the projection of the second discharge hole 1223 on the plane do not overlap, so that the total discharge area of ​​the first discharge hole 1231 and the second discharge hole 1223 is larger, thereby improving the discharge efficiency.

[0106] As an example, Fig.10 Another possible position of the first discharge hole 1231 is shown. Taking the annular second discharge hole 1223 as an example, the first discharge hole 1231 includes a first sub-discharge hole 1231A and a second sub-discharge hole 1231B. The projection of the second discharge hole 1223 on a plane perpendicular to the thickness direction Z surrounds the projection of the first sub-discharge hole 1231A on the plane, and the projection of the second sub-discharge hole 1231B on the plane overlaps with the projection of the second discharge hole 1223 on the plane. By providing the first sub-discharge hole 1231A and the second sub-discharge hole 1231B, the discharge area is increased, the discharge path is shortened, and the discharge efficiency is improved.

[0107] Among them, Fig.10 As shown, the diameter D2 of the second sub-discharge hole 1231B on the support member 123 can be greater than or equal to the radial dimension D1 of the ring of the second discharge hole 1223, so that the obstruction of the second discharge hole 1223 by the first discharge hole 1231 can be reduced, which is conducive to improving the discharge performance.

[0108] In some embodiments, Fig. 9 and Fig.10 As shown, the area of ​​the first sub-discharge hole 1231A is greater than or equal to the area of ​​the second sub-discharge hole 1231B. The area of ​​the first sub-discharge hole 1231A is set to be greater than the area of ​​the second sub-discharge hole 1231B, which can fully utilize the position of the support member 123 corresponding to the inner area surrounded by the second discharge hole 1223, thereby improving the discharge efficiency and helping to reduce the weight of the support member 123.

[0109] The number and shape of the first discharge holes 1231 can be set according to actual conditions. Usually, there can be multiple first discharge holes 1231, and the sizes and shapes of the multiple first discharge holes 1231 can be the same or different. The number and shape of the second sub-discharge holes 1231B can also be set according to actual conditions.

[0110] For example, Fig.10 As shown, the first sub-discharge hole 1231A includes an oblong hole, and the second sub-discharge hole 1231B includes a circular hole. The first sub-discharge hole 1231A is correspondingly arranged in the inner area surrounded by the ring, and the second sub-discharge hole 1231B is correspondingly arranged in the two end areas of the ring along the length direction Y and symmetrical along the width direction X; for example, Fig.11 As shown, the first sub-discharge hole 1231A includes an oblong hole and a circular hole, and the second sub-discharge hole 1231B includes a circular hole. The oblong holes in the first sub-discharge hole 1231A are correspondingly arranged in the inner area surrounded by a ring, and the circular holes in the first sub-discharge hole 1231A are correspondingly arranged in the end area of ​​the inner area surrounded by a ring in the length direction Y and are symmetrical along the width direction X. The second sub-discharge hole 1231B is correspondingly arranged in the areas corresponding to the two ends of the ring along the length direction Y and are symmetrical along the width direction X. The number K of the second sub-discharge holes 1231B can be set to 1≤K≤6, for example, which can ensure the discharge performance without increasing the process difficulty.

[0111] In addition to the above examples, the shape of the second sub-discharge hole 1231B may be, for example, a circle, a rectangle, an oblong hole along the center line of the width direction X or the length direction Y of the insulating member 1222 , or the like.

[0112] In some embodiments, the support member 123 includes a main body portion 1235 and a second protrusion 1236 protruding along the main body portion 1235 toward the electrode assembly 121, the main body portion 1235 is used to support the pole ear 1211 of the electrode assembly 121, the second protrusion 1236 is used to support the non-pole ear area on the end surface 1212 of the electrode assembly 121, and the first discharge hole 1231 is located at the second protrusion 1236.

[0113] Since the tab 1211 of the electrode assembly 121 is protrudingly arranged on the end surface 1212 of the electrode assembly 121 facing the support member 123, the main body 1235 of the support member 123 can be attached to the tab 1211 to support the tab 1211, and the second protrusion 1236 on the support member 123 protruding along the main body 1235 toward the electrode assembly 121 can be attached to the end surface 1212 of the electrode assembly 121 to support the end surface 1212. The tab 1211 and the end surface 1212 are supported respectively by the main body 1235 and the second protrusion 1236, thereby improving the reliability of the support member 123. And the first discharge hole 1231 on the support member 123 can be arranged on the second protrusion 1236 of the support member 123, and is opposite to the pressure relief mechanism 124 of the battery cell 120, which is conducive to the discharge of the internal pressure of the battery cell 120.

[0114] For example, Figure 3 The pole lugs 1211 shown are usually arranged at the four corners of the end surface 1212. Figure 5 and Figure 6 The support member 123 shown, or as Fig.12 and Fig.13 In the support member 123 shown, relative to the main body 1235 , the second protrusion 1236 protrudes toward the electrode assembly 121 along the middle area of ​​the support member 123 , so that the main body 1235 on the support member 123 is located at the four corners of the second protrusion 1236 .

[0115] In some embodiments, the support member 123 is further provided with an opening 1237 penetrating the support member 123, and the opening 1237 is located at the intersection of the main body 1235 of the support member 123 and the second protrusion 1236. The opening 1237 can be used to avoid the first protrusion 12221 provided at the position corresponding to the second protrusion 1236 on the insulating member 1222, and can also reduce the weight of the support member 123.

[0116] In some embodiments, on a plane perpendicular to the thickness direction Z of the end cap assembly 122, the projection of the opening 1237 covers the portion of the projection of the second discharge hole 1223 that is not covered by the projection of the second protrusion 1236. The opening 1237 can effectively avoid at least a portion of the second discharge hole 1223, reduce the shielding of the second discharge hole 1223 by the support member 123, and help improve the discharge performance.

[0117] As an example, Fig.12 and Fig.13 As shown, Fig.12 This is a schematic diagram before the support member 123 and the insulating member 1222 are assembled. Fig.12 It is a top view after the support member 123 and the insulating member 1222 are assembled. The main body 1235 on the support member 123 is located at the four corners of the second protrusion 1236. The main body 1235 and the second protrusion 1236 are used to support the pole ear 1211 of the electrode assembly 121 and the end surface 1212 where the pole ear 1211 is located, respectively. The second protrusion 1236 includes a transverse portion extending along the length direction Y and a vertical portion extending along the width direction X, thereby obtaining a "cross"-shaped second protrusion 1236 having a transverse portion and a vertical portion. Among them, the vertical portion can cooperate with the first protrusion 12221 of the insulating member 1222 to accommodate the first protrusion 12221. In order to facilitate the cooperation between the vertical portion and the first protrusion 12221 of the insulating member 1222, optionally, the dimension W3 of the vertical portion of the second protrusion 1236 along the length direction Y needs to be larger than the dimension P of the first protrusion 12221 of the insulating member 1222 along the length direction Y. For a conventional battery cell 120, for example, W3 ≥ 2 mm can be set.

[0118] In addition, in order to reduce the influence of the opening 1237 on the structural strength of the support member 123, optionally, the dimension Q of the lateral portion of the second protrusion 1236 of the support member 123 should not be set too small. For a conventional battery cell 120, for example, Q can be set to ≥ 2 mm.

[0119] Generally, the ring shape of the second discharge hole 1223 may be a circular or elliptical ring shape. In the case where the ring shape of the second discharge hole 1223 is an elliptical ring shape, the width direction X may be the direction of the short axis of the ellipse, and the length direction Y may be the direction of the long axis of the ellipse, for example, Figures 5 to 11 Alternatively, the width direction X is the direction of the major axis of the ellipse, and the length direction Y is the direction of the minor axis of the ellipse, for example Fig.12 and Fig.13 The situation shown.

[0120] The present application also provides a battery, comprising the battery cell 120 described in any of the above embodiments.

[0121] The present application also provides an electric device, comprising the battery 10 described in any of the above embodiments, the battery 10 is used to provide electric energy to the electric device. The electric device is, for example, the vehicle 1 described above.

[0122] It can be seen that the battery cell 120 of the embodiment of the present application releases its internal pressure through the pressure relief mechanism 124 on its end cap assembly 122, and a support member 123 can be arranged between the end cap assembly 122 and the electrode assembly 121. In particular, for the inverted battery cell 120, the support member 123 can effectively support the electrode assembly 121, so that the gravity of the electrode assembly 121 is not easily transmitted to the pole ear 1211 to cause risks. The end cap assembly 122 includes an end cap provided with a pressure relief mechanism 124 and an insulating member 1222, wherein a second discharge hole 1223 is arranged at a position corresponding to the pressure relief mechanism 124 on the insulating member 1222, and a first discharge hole 1231 penetrating the support member 123 is arranged at a position corresponding to the pressure relief mechanism 124 on the support member 123, and the first discharge hole 1231 and the second discharge hole 1223 may not overlap or at least partially overlap. Thus, the high-temperature and high-pressure exhaust inside the battery cell 120 can pass through the first exhaust hole 1231 and the second exhaust hole 1223 and be discharged from the pressure relief mechanism 124 to achieve effective pressure relief, thereby improving the pressure relief capability of the battery cell 120. At the same time, the first exhaust hole 1231 can also play a role in weight reduction.

[0123] It should be noted that, under the premise of no conflict, the various embodiments described in this application and / or the technical features in each embodiment can be arbitrarily combined with each other, and the technical solution obtained after the combination should also fall within the protection scope of this application.

[0124] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; an end cap assembly, comprising an end cap, and an insulating member located between the end cap and the electrode assembly, wherein the end cap is provided with a pressure relief mechanism, and a second discharge hole is provided on the insulating member at a position corresponding to the pressure relief mechanism, and the second discharge hole penetrates the insulating member along a thickness direction of the end cap assembly; and A support member is disposed between the insulating member and the electrode assembly. A first discharge hole is disposed on the support member at a position corresponding to the pressure relief mechanism. The first discharge hole penetrates the support member along the thickness direction.

2. The battery cell according to claim 1, characterized in that: A projection of the first discharge hole on a plane perpendicular to the thickness direction does not overlap with a projection of the second discharge hole on the plane.

3. The battery cell according to claim 2, characterized in that: A projection of the second discharge hole on the plane surrounds a projection of the first discharge hole on the plane.

4. The battery cell according to claim 3, characterized in that: A projection of the second discharge hole on a plane perpendicular to the thickness direction is annular.

5. The battery cell according to claim 1, characterized in that: A projection of the first discharge hole on a plane perpendicular to the thickness direction at least partially overlaps with a projection of the second discharge hole on the plane.

6. The battery cell according to claim 5, characterized in that: The first discharge hole includes a first sub-discharge hole and a second sub-discharge hole, a projection of the second discharge hole on the plane surrounds a projection of the first sub-discharge hole on the plane, and a projection of the second sub-discharge hole on the plane overlaps with a projection of the second discharge hole on the plane.

7. The battery cell according to claim 6, characterized in that: The projection of the second discharge hole on a plane perpendicular to the thickness direction is a ring shape, and a dimension of the ring along a radial direction is smaller than or equal to a dimension of the second sub-discharge hole along the radial direction.

8. The battery cell according to claim 6 or 7, characterized in that: An area of ​​the first sub-discharge hole is greater than or equal to an area of ​​the second sub-discharge hole.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The insulating member is provided with a first protruding portion protruding toward the supporting member, and the second discharge hole is at least partially located on the first protruding portion.

10. The battery cell according to claim 9, characterized in that: The first protrusion is provided with a step at the end portion along the width direction of the end cover assembly, and the support member is formed with a notch inwardly along the side edge along the length direction of the end cover assembly for avoiding the step.

11. The battery cell according to claim 10, characterized in that: A gap is arranged between the edge of the step and the edge of the notch along the width direction, and the gap is used to avoid a portion of the second discharge hole arranged along the edge of the step.

12. The battery cell according to claim 11, characterized in that: A dimension of the notch in the length direction is greater than or equal to a dimension of a portion of the second discharge hole arranged along the edge of the step in the length direction.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The support member includes a main body portion and a second protrusion portion protruding along the main body portion toward the electrode assembly, the main body portion is used to support the pole ear of the electrode assembly, the second protrusion portion is used to support the non-pole ear area on the end surface of the electrode assembly, and the first discharge hole is located at the second protrusion portion.

14. The battery cell according to claim 13, characterized in that: The support member is also provided with an opening penetrating the support member, and the opening is located at a position where the main body and the second protruding portion intersect.

15. The battery cell according to claim 14, characterized in that: On a plane perpendicular to the thickness direction of the end cover assembly, the projection of the opening covers a portion of the projection of the second discharge hole that is not covered by the projection of the second protrusion.

16. The battery cell according to any one of claims 1 to 15, characterized in that: A hook portion is provided at the end of the support member in the length direction of the end cover assembly, and the hook portion is hooked and matched with the insulating member to connect the support member and the end cover assembly.

17. A battery, characterized in that: The invention comprises at least one battery cell according to any one of claims 1 to 16.

18. An electrical device, characterized in that: The battery according to claim 17 is used to provide power for the electrical device.

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