Battery and electric device

Abstract

The invention provides a battery and a power utilization device. The battery comprises a battery monomer, a bus piece and an insulating piece, the battery monomer comprises a shell and an electrode terminal, the shell is provided with a first wall, and the electrode terminal is arranged on the first wall; the bus piece is electrically connected with the electrode terminal; the insulating part is arranged on the side, facing the electrode terminal, of the bus part and covers at least part of the first wall, and the insulating part is provided with a first groove sunken in the direction away from the first wall. According to the battery and the power utilization device provided by the invention, the first groove can be used for accommodating the electrolyte leaked from the battery monomer, so that the risk of high-voltage short circuit in the battery caused by the fact that the electrolyte is electrically connected with the two adjacent confluence pieces is reduced, and the reliability of the battery is favorably improved.

Description

Batteries and electrical devices Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy planes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0003] In the development of battery technology, in addition to improving battery performance, improving battery reliability is also an issue that cannot be ignored. Improving battery reliability has a significant impact on energy conservation. Therefore, improving battery reliability is a technical issue that requires continuous improvement in battery technology.

[0004] Summary of the Invention

[0005] The present application provides a battery and an electrical device, which can improve the reliability of the battery.

[0006] In the first aspect, a battery provided according to an embodiment of the present application includes a battery cell, a busbar and an insulating member; the battery cell includes a shell and an electrode terminal, the shell has a first wall, and the electrode terminal is arranged on the first wall; the busbar is electrically connected to the electrode terminal; the insulating member is arranged on a side of the busbar facing the electrode terminal and covers at least a portion of the first wall, and the insulating member has a first groove that is recessed in a direction away from the first wall.

[0007] In the battery provided in the embodiment of the present application, the insulating part is arranged on the side of the busbar facing the electrode terminal, and the insulating part has a first groove that is recessed in the direction away from the first wall. When the electrode terminal of the battery cell is placed downward in the direction of gravity, when the electrolyte in the battery cell leaks, the electrolyte falls on the insulating part under the action of gravity and flows into the first groove along the surface of the insulating part close to the first wall. In this way, the first groove can be used to accommodate the leaked electrolyte of the battery cell, reducing the risk of the electrolyte electrically connecting two adjacent busbars and causing a high-voltage short circuit inside the battery. This is conducive to improving the reliability of the battery.

[0008] In some embodiments, the insulating member includes a second wall facing toward the first wall. The second wall surrounds at least a portion of the periphery of the first groove and is inclined outward from the periphery of the first groove toward the first wall. This arrangement facilitates the timely and rapid flow of electrolyte leaked from the battery cells into the first groove, further reducing the risk of electrolyte electrically connecting two adjacent busbars and improving battery reliability.

[0009] In some embodiments, the battery includes multiple battery cells, and the insulating member is provided with multiple first grooves. The first wall of each battery cell is disposed opposite at least one of the first grooves. This arrangement allows electrolyte leaking from the connection between the first wall of each battery cell and the electrode terminal to flow into the corresponding first groove along a relatively close path, further reducing the risk of electrolyte electrically connecting two adjacent busbars and causing a high-voltage short circuit within the battery.

[0010] In some embodiments, the first wall is provided with at least two first grooves, including two first grooves provided diagonally to the first wall. If the battery is tilted, electrolyte leaking from the battery cells can flow into the corresponding first grooves, thereby further improving the smoothness of electrolyte flow into the first grooves and reducing the possibility of electrolyte electrically connecting two adjacent busbars.

[0011] In some embodiments, the first wall is provided with at least four first grooves, including four first grooves corresponding to two pairs of diagonal corners of the first wall. This helps to further improve the smoothness of electrolyte flow into the first grooves when the battery is tilted, and further reduces the possibility of electrolyte electrically connecting two adjacent busbars.

[0012] In some embodiments, the first groove has a first drainage hole disposed through the bottom wall of the first groove. The first drainage hole allows for timely drainage of electrolyte from the first groove, further reducing the risk of electrolyte electrically connecting two adjacent busbars and causing a high-voltage short circuit within the battery.

[0013] In some embodiments, the first groove has a first sidewall extending along a first direction and a second sidewall extending along a second direction, the first sidewall being connected to the second sidewall, and both the first sidewall and the second sidewall being connected to the outer periphery of the bottom wall of the first groove; the first sidewall having a dimension h1 along the thickness direction of the first wall, and a minimum spacing w1 between the edge of the first drainage hole and the first sidewall along the second direction, where w1 ≤ 5.67h1; and / or the second sidewall having a dimension h2 along the thickness direction of the first wall, and a minimum spacing w2 between the edge of the first drainage hole and the second sidewall along the first direction, where w2 ≤ 2.74h2; wherein the first direction and the second direction intersect the thickness direction of the first wall in pairs. With this configuration, even when the battery is tilted by no more than 10° along the second direction and / or no more than 20° along the first direction, electrolyte leaked from the battery cells can still be discharged through the first drainage hole, thereby reducing the risk of electrolyte electrically connecting two adjacent busbars when the battery is tilted.

[0014] In some embodiments, the first groove has a plurality of first drainage holes, which are spaced apart. This helps increase the rate at which the electrolyte in the first groove is discharged. Furthermore, if the bottom wall of the first groove is tilted relative to the horizontal, the electrolyte can be discharged through the first drainage holes that are positioned lower after the tilt. This further helps to promptly discharge the electrolyte in the first groove and reduces the risk of the electrolyte electrically connecting two adjacent busbars.

[0015] In some embodiments, at least one first drainage hole is disposed at a corner of the first groove. When the battery is tilted in a corresponding direction, the first drainage hole is located at a lower position of the first groove, which facilitates timely discharge of electrolyte in the first groove through the first drainage hole.

[0016] In some embodiments, the insulating member further comprises a flow guide groove connected to the first groove. Electrolyte leaking from the battery cells and dripping onto the insulating member may first flow into the flow guide groove and then into the first groove. This facilitates the timely flow of electrolyte leaking from the battery cells into the first groove.

[0017] In some embodiments, the battery cell further includes a pressure relief mechanism disposed on the first wall, with at least a portion of the pressure relief mechanism's orthographic projection on the insulating member along the thickness direction of the first wall located within the flow guide groove. This arrangement facilitates the timely flow of electrolyte leaking from the pressure relief mechanism into the first groove, further reducing the possibility of electrolyte leaking from the battery cell electrically connecting to two adjacent busbars.

[0018] In some embodiments, along the thickness direction of the first wall, the orthographic projection of the pressure relief mechanism on the insulating member is located within the guide groove, and the minimum spacing between the edge of the orthographic projection of the pressure relief mechanism on the insulating member and the sidewall of the guide groove is a. Along the thickness direction of the first wall, the minimum spacing between the pressure relief mechanism and the guide groove is h3, where a ≥ 0.36h3. ​​This increases the likelihood that electrolyte leaking from the pressure relief mechanism will fall into the guide groove when the battery is tilted less than 20°, thereby further improving battery reliability.

[0019] In some embodiments, the guide groove is recessed away from the first wall, and along the thickness direction of the first wall, the size of the guide groove is less than or equal to the size of the first groove. When the electrode terminals of the battery cell are positioned downward in the direction of gravity, the bottom wall of the first groove is lower than the bottom wall of the guide groove, thereby facilitating smoother flow of electrolyte in the guide groove into the first groove.

[0020] In some embodiments, the first wall has a liquid injection port for injecting electrolyte into the housing. At least a portion of the orthographic projection of the liquid injection port on the insulating member along the thickness of the first wall is located within the guide groove. This facilitates the timely flow of electrolyte leaking through the liquid injection port into the first recess via the guide groove.

[0021] In some embodiments, the battery cell further includes a pressure relief mechanism disposed on the first wall. The insulating member includes a second groove recessed away from the first wall, with at least a portion of the pressure relief mechanism's orthographic projection on the insulating member along the thickness direction of the first wall located within the second groove. This allows at least a portion of electrolyte leaking from the battery cell through the pressure relief mechanism to flow directly into and be stored within the second groove, further reducing the risk of electrolyte leaking from the battery cell electrically connecting to two adjacent busbars and improving battery reliability.

[0022] In some embodiments, the second groove has a second drainage hole disposed through the bottom wall of the second groove. The provision of the second drainage hole allows for timely discharge of electrolyte from the second groove, further reducing the risk of electrolyte electrically connecting two adjacent busbars and causing a high-voltage short circuit within the battery.

[0023] In some embodiments, the insulating member further has a connecting flow channel that connects the first groove and the second groove. This configuration allows the first groove and the second groove to accommodate more electrolyte, further reducing the risk of the electrolyte electrically connecting two adjacent busbars.

[0024] In some embodiments, the battery includes multiple battery cells arranged along a first direction. The insulating member includes at least one first blocking protrusion extending along a second direction and located on a side of the insulating member proximal to the first wall, where the second direction intersects the first direction. The first blocking protrusion is located between two first grooves corresponding to the first walls of two adjacent battery cells along the first direction. In this manner, if electrolyte leaking from one battery cell drips onto the insulating member, the blocking effect of the first blocking protrusion makes it less likely to flow to the area corresponding to the insulating member of another adjacent battery cell. This further reduces the possibility of electrolyte electrically connecting two adjacent busbars and causing an internal short circuit in the battery.

[0025] In some embodiments, multiple battery cells are arranged in a matrix along a first direction and a second direction. The insulating member has at least one second blocking protrusion extending along the first direction and located on a side of the insulating member proximal to the first wall, intersecting the second blocking protrusion. The second blocking protrusion is located between two first grooves corresponding to the first walls of two adjacent battery cells along the second direction. The second blocking protrusion can be used to restrict the flow of electrolyte in the second direction, further reducing the possibility of electrolyte leaking from the battery cells electrically connecting to two adjacent busbars, thereby further improving the reliability of the battery.

[0026] In some embodiments, the battery includes a plurality of battery cells arranged in a matrix along a first direction and a second direction, the first direction and the second direction intersecting each other. The battery also includes at least one insulating spacer extending along the first direction and disposed between two adjacent busbars along the second direction. The insulating spacer can be used to provide insulation isolation between the two adjacent busbars along the second direction, thereby increasing the creepage distance between the two adjacent busbars, reducing the risk of electrical connection between the two adjacent busbars, and improving the reliability of the battery.

[0027] In some embodiments, the insulating spacer abuts against the first wall of the battery cell and / or the insulating member, which is beneficial for improving the structural compactness of the battery and can further improve the insulation effect of two adjacent busbars through the insulating spacer.

[0028] In some embodiments, the insulating spacer abuts the first walls of two adjacent battery cells along the second direction. This helps reduce the amount of insulating spacer used and the weight of the battery while achieving insulation isolation between the electrode terminals and other structures of the two adjacent battery cells through the insulating spacer.

[0029] In some embodiments, the battery further includes a protective member disposed on a side of the insulating spacer facing away from the battery cell, with the insulating spacer abutting the protective member. This can increase the electrical clearance and creepage distance within the battery, further improving the reliability of the battery. The insulating spacer can also increase the overall structural strength of the battery.

[0030] In some embodiments, a gap is provided between the protective member and the busbar along the thickness direction of the first wall. The gap between the protective member and the busbar serves as a space for the protective member to deform, thereby providing a certain buffering effect on the deformation of the protective member, reducing the risk of damage to the busbar from external loads such as impact or vibration, and providing a certain degree of protection for the busbar.

[0031] In some embodiments, the electrode terminals of the battery cells are arranged downward along the direction of gravity, which is conducive to the timely flow of the electrolyte into the first groove.

[0032] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery as in any embodiment of the first aspect, the battery being used to provide electrical energy, and a first wall of the battery cell being arranged downward along the direction of gravity.

[0033] The electrical device provided in the embodiment of the present application uses the battery provided in the embodiment of the present application. In the event of electrolyte leakage in the battery cell, the first groove can be used to store the electrolyte, thereby reducing the possibility of the electrolyte electrically connecting two adjacent busbars inside the battery and causing a high-voltage short circuit inside the battery, which is beneficial to improving the reliability of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. 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 creative work.

[0035] FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0036] FIG2 is a schematic diagram of an explosion of a battery provided in one embodiment of the present application;

[0037] FIG3 is a schematic structural diagram of a battery module in a battery provided in an embodiment of the present application;

[0038] FIG4 is a schematic diagram of an explosion of a battery cell in a battery provided in some embodiments of the present application;

[0039] FIG5 is a schematic diagram of an exploded structure of another battery provided in an embodiment of the present application;

[0040] FIG6 is a schematic structural diagram of an insulating member in a battery provided in an embodiment of the present application;

[0041] FIG7 is a partial enlarged view of point A in FIG6;

[0042] FIG8 is a schematic structural diagram of another insulating member in a battery provided in an embodiment of the present application;

[0043] FIG9 is an exploded schematic diagram of a battery provided in an embodiment of the present application with some structures omitted;

[0044] FIG10 is a schematic structural diagram of another insulating member in a battery provided in an embodiment of the present application;

[0045] FIG11 is a schematic cross-sectional view of a portion of the structure of a battery provided in an embodiment of the present application;

[0046] FIG12 is a partial enlarged view of point B in FIG11;

[0047] FIG13 is a front view of a battery provided in an embodiment of the present application;

[0048] FIG14 is a schematic cross-sectional view of the structure along CC in FIG13;

[0049] FIG15 is a partial enlarged view of point D in FIG14;

[0050] FIG16 is a schematic structural diagram of an insulating member in a battery provided in an embodiment of the present application;

[0051] FIG17 is a partial enlarged view of point E in FIG16 .

[0052] In the drawings, the drawings are not drawn to scale.

[0053] Description of reference numerals:

[0054] 1. Vehicle; 1a. Motor; 1b. Controller;

[0055] 10. Battery; 11. First housing; 12. Second housing;

[0056] 20. Battery module;

[0057] 30. Battery cell; 31. Housing; 31a. First wall; 311. Housing; 311a. Opening; 312. End cap; 32. Electrode assembly; 33. Electrode terminal; 34. Pressure relief mechanism; 35. Liquid filling port;

[0058] 40. Busbars;

[0059] 50, insulating member; 50a, first groove; 50b, first drainage hole; 50c, guide groove; 50d, second groove; 50e, connecting flow channel; 51d, second drainage hole; 51, second wall; 52, first blocking protrusion; 53, second blocking protrusion; 54, first side wall; 55, second side wall

[0060] 60. Insulation and isolation parts; 70. Protective parts;

[0061] M, first direction; N, second direction; O, thickness direction. DETAILED DESCRIPTION

[0062] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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" and "second" 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-secondary relationship.

[0064] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0066] The term "and / or" in this application simply describes the relationship between related objects, indicating that three possible relationships exist. For example, C and / or D can mean: C exists alone, C and D exist simultaneously, or D exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0067] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0068] The term "plurality" used in this application refers to two or more (including two).

[0069] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0070] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0071] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive protrusion protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer. At least a portion of the positive protrusion portion is not coated with the positive active material layer. The positive protrusion portion serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting portion and a negative electrode protrusion protruding from the negative electrode current collecting portion, the negative electrode current collecting portion is coated with the negative electrode active material layer, and at least part of the negative electrode protrusion is not coated with the negative electrode active material layer, and the negative electrode protrusion serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly can be a wound structure or a laminated structure, and the embodiments of the present application are not limited to this.

[0072] After the inventor discovered the problem of low reliability during the operation of the battery, he conducted a systematic analysis and research on the structure and working process of the battery. The results showed that the battery cells are connected in series and parallel through a busbar, and the busbar or the outer shell of the battery cell is insulated and isolated from other structures inside the battery, such as wiring harnesses, through an insulating part. As the battery is used for a longer time, the number of cycles of the battery cells inside the battery gradually increases. Especially when the battery cell is in an inverted state, the electrolyte inside the battery cell is prone to leakage and accumulates on the insulating part inside the battery. As the amount of electrolyte leakage of the battery cell accumulates, the electrolyte is prone to electrically connect two adjacent busbars, which brings the risk of high-voltage short circuit to the battery, thus seriously affecting the reliability performance of the battery.

[0073] Based on the above problems discovered by the inventors, the inventors have improved the structure of the battery. The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices using batteries.

[0074] A battery provided according to an embodiment of the present application includes a battery cell, a current busbar, and an insulating member. The battery cell includes a housing and electrode terminals. The housing has a first wall, and the electrode terminals are disposed on the first wall. The current busbar is electrically connected to the electrode terminals. The insulating member is disposed on a side of the busbar facing the electrode terminals and covers at least a portion of the first wall. The insulating member has a first groove that is recessed in a direction away from the first wall.

[0075] The battery provided in the embodiment of the present application is provided with an insulating member having a first groove that is recessed in a direction away from the first wall of the battery cell. In this way, after electrolyte leakage occurs at the connection between the electrode terminal of the battery cell and the first wall, the electrolyte can be accommodated by the first groove. In this way, as the leakage amount of the battery cell increases, the electrolyte flows to and is accommodated in the first groove, which can effectively reduce the risk of the electrolyte electrically connecting two adjacent busbars and causing a high-voltage short circuit inside the battery, thereby improving the reliability of the battery.

[0076] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0077] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0078] As shown in FIG1 , a battery 10 is provided inside a vehicle 1. The battery 10 may be provided at the bottom, head, or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may serve as an operating power source for the vehicle 1.

[0079] The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of the vehicle 1 during starting, navigation, and driving.

[0080] In some embodiments of the present application, the battery 10 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0081] 2 , the battery 10 includes battery cells (not shown in FIG2 ) and may further include a case for accommodating the battery cells.

[0082] The box body is used to accommodate battery cells, and the box body can be of various structural forms. In some embodiments, the box body can include a first box body portion 11 and a second box body portion 12. The first box body portion 11 and the second box body portion 12 cover each other. The first box body portion 11 and the second box body portion 12 jointly define a storage space for accommodating battery cells. The second box body portion 12 can be a hollow structure with one end open, and the first box body portion 11 is a plate-shaped structure. The first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space; the first box body portion 11 and the second box body portion 12 can also be hollow structures with one side open. The open side of the first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space. Of course, the first box body portion 11 and the second box body portion 12 can be of various shapes, such as cylinders, cuboids, etc.

[0083] In order to improve the sealing performance after the first box body 11 and the second box body 12 are connected, a sealing member such as a sealant or a sealing ring may be provided between the first box body 11 and the second box body 12 .

[0084] Assuming that the first box body portion 11 covers the second box body portion 12 , the first box body portion 11 can also be referred to as an upper box cover, and the second box body portion 12 can also be referred to as a lower box body.

[0085] In the battery 10, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 20 is housed in a housing. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 20. Multiple battery modules 20 are then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed in a housing.

[0086] In some embodiments, as shown in FIG3 , which is a schematic diagram of the structure of the battery module 20 shown in FIG2 , the battery module 20 includes multiple battery cells 30. The multiple battery cells 30 are first connected in series, parallel, or in a mixed series to form the battery module 20. The multiple battery modules 20 are then connected in series, parallel, or in a mixed series to form a single unit, which is then housed in a housing.

[0087] In some embodiments, the multiple battery cells 30 in the battery module 20 may be electrically connected via a busbar 40 to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .

[0088] Please refer to Figure 4, which is an exploded view of the battery cell 30 shown in Figure 3. The battery cell 30 provided in the embodiment of the present application includes an electrode assembly 32 and a housing 31. The housing 31 has a receiving cavity, and the electrode assembly 32 is received in the receiving cavity.

[0089] In some embodiments, the housing 31 may include a shell 311 and an end cap 312, wherein the shell 311 is a hollow structure with an opening on one side, and the end cap 312 covers the opening 311a of the shell 311 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 32 and the electrolyte.

[0090] When assembling the battery cell 30 , the electrode assembly 32 may be placed in the housing 311 , the end cap 312 may be placed over the opening 311 a of the housing 311 , and the electrolyte may be injected into the housing 311 through the electrolyte injection port on the end cap 312 .

[0091] In some embodiments, the housing 31 may also be used to contain electrolyte, such as electrolyte solution. The housing 31 may have various structural forms.

[0092] FIG4 shows a schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0093] The housing 311 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc. The shape of the housing 311 can be determined based on the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 has a cylindrical structure, the housing 311 can also be a cylindrical structure. If the electrode assembly 32 has a rectangular parallelepiped structure, the housing 311 can also be a rectangular parallelepiped structure. In FIG4 , for example, both the housing 311 and the electrode assembly 32 have rectangular parallelepiped structures.

[0094] The shell 311 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0095] There may be one or more electrode assemblies 32 housed in the housing 311. In FIG4 , there are two electrode assemblies 32 housed in the housing 311.

[0096] In some embodiments, the electrode assembly 32 further includes a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 32 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet. The electrode assembly 32 may also be a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet.

[0097] The positive electrode sheet may include a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The negative electrode sheet may include a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The separator is located between the positive and negative electrode sheets, isolating the positive and negative electrode sheets to reduce the risk of short circuits between the positive and negative electrode sheets.

[0098] The tabs in the electrode assembly 32 are divided into positive tabs and negative tabs. The positive tab is the portion of the positive electrode current collector that is not coated with the positive electrode active material layer. The negative tab is the portion of the negative electrode current collector that is not coated with the negative electrode active material layer.

[0099] As shown in Figures 4 and 5, a battery 10 according to an embodiment of the present application includes a battery cell 30, a current bus 40, and an insulating member 50. The battery cell 30 includes a housing 31 and an electrode terminal 33. The housing 31 has a first wall 31a, and the electrode terminal 33 is disposed on the first wall 31a. The current bus 40 is electrically connected to the electrode terminal 33. The insulating member 50 is disposed on a side of the current bus 40 facing the electrode terminal 33 and covers at least a portion of the first wall 31a. The insulating member 50 has a first groove 50a that is recessed in a direction away from the first wall 31a.

[0100] In the battery cell 30, the electrode terminal 33 can be electrically connected to the electrode assembly 32 within the outer casing 31 of the battery cell 30 to enable cyclic charge and discharge of the electrode assembly 32. The electrode terminal 33 is disposed on the first wall 31a and can be connected to the first wall 31a of the outer casing 31 through welding, riveting, or other processes. When the battery 10 is in an inverted operating condition, the electrode terminal 33 of the battery cell 30 is positioned downward in the direction of gravity. The electrolyte within the battery cell 30 can easily leak through the connection between the electrode terminal 33 and the first wall 31a and drip onto the insulating member 50.

[0101] Optionally, the housing 31 has a shell 311 and an end cover 312 , and the first wall 31 a may be a part of the shell 311 , or the first wall 31 a is at least a part of the end cover 312 .

[0102] The battery cell 30 may also have a pressure relief mechanism 34. The pressure relief mechanism 34 can be configured to explode when the pressure inside the battery cell 30 reaches a pressure relief threshold, allowing gas inside the battery cell 30 to escape. Optionally, the pressure relief mechanism 34 can be disposed on the first wall 31a, or on another wall of the housing 31 that is opposite or adjacent to the first wall 31a. The preferred arrangement can be determined based on actual needs.

[0103] The outer shell 31 of the battery cell 30 may further include an injection port 35 through which electrolyte is injected into the interior of the battery cell 30 during the manufacturing process of the battery cell 30. Optionally, the injection port 35 may be provided on the first wall 31a, or on another wall of the outer shell 31 adjacent to or opposite to the first wall 31a, and the selection may be based on actual needs.

[0104] The busbar 40 is electrically connected to the electrode terminals 33 , and the busbar 40 can connect the electrode terminals 33 of any two battery cells 30 to achieve series connection or parallel connection between the multiple battery cells 30 .

[0105] The insulating member 50 is disposed on the side of the current bus 40 facing the electrode terminal 33 and covers at least a portion of the first wall 31 a. Thus, the insulating member 50 covers at least a portion of the current bus 40 and the first wall 31 a. For example, the insulating member 50 covers the entire area of ​​the first wall 31 a to reduce the risk of a short circuit between the first wall 31 a or the current bus 40 and other electrical structures within the battery 10.

[0106] The insulating member 50 may be a wiring harness isolation plate inside the battery 10 to insulate the first wall 31 a of the battery cell 30 and the busbar 40 from electrical structures such as wiring harnesses on the other side of the insulating member 50 .

[0107] The insulating member 50 has a first groove 50a recessed in a direction away from the first wall 31a. Optionally, the first groove 50a can be formed by injection molding or stamping, or by removing material such as cutting or milling.

[0108] When the electrode terminals 33 of the battery cell 30 are positioned downward in the direction of gravity, the first grooves 50a are recessed downward in the direction of gravity relative to the remaining area on the side of the insulating member 50 facing the first wall 31a. This allows electrolyte to leak from the battery cell 30 and, under the action of gravity, drip onto the side of the insulating member 50 facing the first wall 31a. Gravity then allows the electrolyte to drip or flow into the first grooves 50a. By properly arranging the number and size of the first grooves 50a, the first grooves 50a can accommodate sufficient electrolyte over the life of the battery 10, reducing the risk of electrolyte electrically connecting two adjacent busbars 40 and causing a high-voltage short circuit within the battery 10.

[0109] Optionally, the insulating member 50 may be provided with enough or large enough first grooves 50a to accommodate all electrolyte leaked from the battery cells 30 during the life cycle of the battery 10, or related drainage channels may be provided to timely discharge the electrolyte in the first grooves 50a.

[0110] Optionally, the insulating member 50 may have one first groove 50a, or multiple first grooves 50a. The insulating member 50 may be provided with a first groove 50a in an area opposite to each battery cell 30 along the thickness direction O of the first wall 31a, or the insulating member 50 may be provided with a first groove 50a in an area opposite to some battery cells 30 along the thickness direction O of the first wall 31a.

[0111] Optionally, at least a portion of the current collector 40 may be disposed in the first groove 50 a , so that the first groove 50 a provides a certain limiting effect for the current collector 40 .

[0112] Alternatively, the first wall 31 a of one battery cell 30 may be disposed opposite to one first groove 50 a along the thickness direction O, or the first wall 31 a of one battery cell 30 may be disposed opposite to two or more first grooves 50 a along the thickness direction O.

[0113] Optionally, the first groove 50 a may be arranged opposite to at least a portion of the current bus 40 along the thickness direction O, or the orthographic projection of the current bus 40 along the thickness direction O on the insulating member 50 may be staggered with the first groove 50 a.

[0114] The insulating member 50 is arranged on the side of the busbar 40 facing the electrode terminal 33, and the area where the insulating member 50 is opposite to the busbar 40 can be arranged flat with other areas, or, the area where the insulating member 50 is opposite to the busbar 40 is recessed relative to other areas in the direction facing the first wall 31a, so that the insulating member 50 is located between the busbar 40 and the electrode terminal 33, and facilitates the electrical connection between the busbar 40 and the electrode terminal 33, while ensuring a certain gap between the insulating member 50 and the first wall 31a.

[0115] In the battery 10 provided in the embodiment of the present application, the insulating member 50 is arranged on the side of the busbar 40 facing the electrode terminal 33, and the insulating member 50 has a first groove 50a that is recessed in a direction away from the first wall 31a. When the electrode terminal 33 of the battery cell 30 is placed downward in the direction of gravity, when the electrolyte in the battery cell 30 leaks, the electrolyte falls on the insulating member 50 under the action of gravity and flows into the first groove 50a along the surface of the insulating member 50 on the side close to the first wall 31a. In this way, the first groove 50a can be used to accommodate the electrolyte leaked from the battery cell 30, reducing the risk of the electrolyte electrically connecting two adjacent busbars 40 and causing a high-voltage short circuit inside the battery 10. This is conducive to improving the reliability of the battery 10.

[0116] In some embodiments, the insulating member 50 has a second wall 51 facing the first wall 31a. The second wall 51 surrounds at least a portion of the circumference of the first groove 50a. From the circumference of the first groove 50a outward, the second wall 51 is inclined in a direction close to the first wall 31a.

[0117] Optionally, the second wall 51 may be arranged to be inclined in a plane, or may be arranged to be inclined along a curved surface, which can be selected according to actual needs.

[0118] The second wall 51 of the insulating member 50 is disposed toward the first wall 31a of the housing 31, and the second wall 51 surrounds at least a portion of the circumference of the first groove 50a. The second wall 51 can surround all or part of the circumference of the first groove 50a. From the circumference of the second wall 51 outward, the second wall 51 is inclined toward the first wall 31a. That is, the further away the second wall 51 is from the first groove 50a, the closer it is to the first wall 31a. In this way, when the electrode terminals 33 of the battery cell 30 are positioned downward in the direction of gravity, the first groove 50a is at the lowest point of the insulating member 50 in the direction of gravity. After the electrolyte in the battery cell 30 drips onto the second wall 51, it slides down the second wall 51 toward the first groove 50a under the action of gravity and ultimately flows into the first groove 50a.

[0119] Therefore, the second wall 51 of the insulating part 50 is arranged to be inclined outward from the circumferential side of the first groove 50a in a direction close to the first wall 31a, which is conducive to the electrolyte leaked from the battery cell 30 to flow into the first groove 50a in a timely and rapid manner, further reducing the risk of the electrolyte electrically connecting two adjacent busbars 40, and improving the reliability of the battery 10.

[0120] 4 and 5 , in some embodiments, the battery 10 includes a plurality of battery cells 30 , the insulating member 50 is provided with a plurality of first grooves 50 a , and the first wall 31 a of each battery cell 30 is disposed opposite to the first groove 50 a .

[0121] Optionally, the first wall 31a of each battery cell 30 may be disposed opposite to one, two or more first grooves 50a. The first grooves 50a may be disposed opposite to any region of the first wall 31a and may be selected according to actual needs.

[0122] In this way, at least a portion of the first wall 31a of each battery cell 30 is arranged opposite to the insulating member 50 along the thickness direction O, and at least a portion of the positive projection of the first wall 31a of each battery cell 30 along the thickness direction O on the first wall 31a is located in the first groove 50a.

[0123] With this arrangement, the electrolyte leaking from the connection between the first wall 31a of each battery cell 30 and the electrode terminal 33 can flow into the corresponding first groove 50a along a shorter path, further reducing the risk of the electrolyte electrically connecting two adjacent busbars 40 and causing a high-voltage short circuit inside the battery 10.

[0124] As shown in FIG. 4 , FIG. 5 , FIG. 6 and FIG. 7 , in some embodiments, the first wall 31 a is correspondingly provided with at least two first grooves 50 a , and the at least two first grooves 50 a include two first grooves 50 a respectively provided at opposite corners of the first wall 31 a .

[0125] The first wall 31 a is correspondingly provided with at least two first grooves 50 a , and one first wall 31 a is arranged opposite to two, three or more first grooves 50 a along the thickness direction O.

[0126] At least two first grooves 50a include two first grooves 50a respectively arranged corresponding to the diagonals of the first wall 31a. Then, the area where the insulating member 50 is opposite to the first wall 31a of the battery cell 30 has diagonals arranged oppositely, and at least two first grooves 50a are located in the diagonal area where the insulating member 50 is opposite to the first wall 31a, that is, at least two first grooves 50a are arranged corresponding to the two diagonals opposite to the first wall 31a.

[0127] Exemplarily, the first wall 31a has a first side extending along the first direction M and a second side extending along the second direction N. The first side and the second side intersect, and at least one first groove 50a is located within the area enclosed by the intersection of the first and second sides, and is disposed near the intersection. Thus, the at least two first grooves 50a are disposed diagonally, with one of the two first grooves 50a located on one side of the first direction M and one side of the second direction N relative to the first wall 31a, and the other located on the other side of the first direction M and the other side of the second direction N relative to the first wall 31a. In other words, the at least two first grooves 50a are not arranged along the first direction M or the second direction N, but are instead arranged along directions intersecting both the first direction M and the second direction N.

[0128] It is understood that during operation of the battery 10, the first wall 31a or the insulating member 50 is not always horizontal and may tilt. Providing at least two first grooves 50a, including two first grooves 50a corresponding to diagonally opposite corners of the first wall 31a, allows electrolyte leaking from the battery cells 30 to flow into the corresponding first grooves 50a if the battery 10 tilts. This further improves the smoothness of electrolyte flow into the first grooves 50a and reduces the possibility of electrolyte electrically connecting two adjacent busbars 40.

[0129] In some embodiments, at least four first grooves 50a are correspondingly provided on the first wall 31a. The at least four first grooves 50a include four first grooves 50a respectively provided corresponding to two pairs of diagonal corners of the first wall 31a.

[0130] In this way, the four first grooves 50a are arranged diagonally intersecting in pairs along the first direction M and the second direction N. Two of the first grooves 50a are arranged opposite to two diagonal positions of the first wall 31a, and the other two first grooves 50a are arranged opposite to the other two diagonal positions of the first wall 31a, that is, the four first grooves 50a are respectively arranged opposite to the four diagonal positions of the first wall 31a.

[0131] Such a configuration is beneficial for further improving the smoothness of the electrolyte flowing into the first groove 50 a when the battery 10 is tilted, and further reducing the possibility of the electrolyte electrically connecting two adjacent busbars 40 .

[0132] In some embodiments, the first groove 50a has a first drainage hole 50b, and the first drainage hole 50b is disposed through the bottom wall of the first groove 50a.

[0133] The bottom wall of the first groove 50a is the wall portion of the first groove 50a that opposes the first wall 31a along the thickness direction O. The first drainage hole 50b extends through the bottom wall of the first groove 50a. After electrolyte leaked from the battery cell 30 flows into the first groove 50a, it can flow out through the first drainage hole 50b, preventing the electrolyte from accumulating in the first groove 50a.

[0134] Alternatively, each first groove 50a may have a first drainage hole 50b, or some of the first grooves 50a may have a first drainage hole 50b. A first groove 50a may have one, two, or more first drainage holes 50b, and the multiple first drainage holes 50b of a first groove 50a may be spaced apart.

[0135] It is understandable that the electrolyte in the first groove 50a can be promptly discharged through the first drainage hole 50b, further reducing the risk of the electrolyte electrically connecting two adjacent busbars 40 and causing a high-voltage short circuit inside the battery 10.

[0136] As shown in Figures 16 and 17, in some embodiments, the first groove 50a has a first sidewall 54 extending along a first direction M and a second sidewall 55 extending along a second direction N. The first sidewall 54 is connected to the second sidewall 55, and both the first sidewall 54 and the second sidewall 55 are connected to the outer periphery of the bottom wall of the first groove 50a. The dimension of the first sidewall 54 along the thickness direction O of the first wall 31a is h1, and the minimum distance between the edge of the first drainage hole 50b and the first sidewall 54 along the second direction N is w1, where w1 ≤ 5.67h1. The first direction M and the second direction N intersect with the thickness direction O of the first wall 31a in pairs. For example, the first direction M and the second direction N may be perpendicular to the thickness direction O of the first wall 31a in pairs.

[0137] If w1≤5.67h1, then w1 / h1 can be 0.1, 0.5, 0.6, 0.8, 1, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 5, 5.5, 5.6 or 5.67, etc.

[0138] It is understood that the battery 10 cannot be guaranteed to operate in a completely horizontal position during operation; it may be tilted. When the battery 10 is tilted in the second direction N, the first groove 50a also tilts in the second direction N. Under the action of gravity, the electrolyte in the first groove 50a accumulates in the lowest corner of the first groove 50a. Therefore, it is necessary to ensure that the electrolyte can still be discharged through the first drainage hole 50b even when the battery 10 is tilted.

[0139] When the battery 10 is tilted at an angle of 10° along the second direction N, to ensure that the electrolyte in the first groove 50a is promptly discharged through the first drainage hole 50b, the maximum allowable value of w1 is 5.67h1. The smaller the tilt angle of the battery 10 along the second direction N, the larger the maximum allowable value of w1. Therefore, setting w1 ≤ 5.67h1 helps ensure that the electrolyte in the first groove 50a is promptly discharged through the first drainage hole 50b when the battery 10 is tilted along the second direction N, further improving the reliability of the battery 10.

[0140] For example, when the battery 10 is used in a vehicle, the second direction N may correspond to the width direction of the vehicle. According to the relevant vehicle design specifications and the actual operating conditions of the vehicle, the maximum allowable angle of the vehicle's tilt forward or backward along the width direction is 10°. When the vehicle is tilted 10° along the width direction, in order for the electrolyte in the first groove 50a to be promptly discharged through the first drainage hole 50b, the maximum allowable value of w1 is 5.67h1. The smaller the tilt angle of the vehicle along the width direction, the larger the maximum allowable value of w1. Therefore, setting w1 ≤ 5.67h1 is beneficial for ensuring that the electrolyte in the first groove 50a is promptly discharged through the first drainage hole 50b when the vehicle is tilted along the width direction, further improving the reliability of the vehicle.

[0141] Therefore, w1≤5.67h1 is set, and under the condition that the battery 10 is tilted no more than 10° along the second direction N, the electrolyte leaked from the battery cell 30 can still be discharged through the first drain hole 50b.

[0142] Please continue to refer to Figures 16 and 17. In some embodiments, the dimension of the second side wall 55 along the thickness direction of the first wall is h2, and the minimum distance between the edge of the first drainage hole 50b and the second side wall 55 along the first direction M is w2, w2≤2.74h2; wherein, the first direction M, the second direction N and the thickness direction O of the first wall 31a intersect each other.

[0143] If w2≤2.74h2, then w2 / h2 can be 0.1, 0.5, 0.6, 0.8, 1, 1.5, 1.8, 2, 2.2, 2.5, 2.6, 2.7 or 2.74, etc.

[0144] During operation, the battery 10 may also tilt in the first direction M. When the battery 10 tilts in the first direction M, the first groove 50a also tilts in the first direction M. Under the action of gravity, the electrolyte in the first groove 50a accumulates in the lowest corner of the first groove 50a. Therefore, it is necessary to ensure that the electrolyte can still be discharged through the first drainage hole 50b even when the battery 10 tilts.

[0145] When the battery 10 is tilted at an angle of 20° along the first direction M, the maximum allowable value of w2 is 2.74h2 to ensure that the electrolyte in the first groove 50a is promptly discharged through the first drainage hole 50b. The smaller the tilt angle of the battery 10 along the first direction M, the larger the maximum allowable value of w2. Therefore, setting w2 ≤ 2.74h2 helps ensure that the electrolyte in the first groove 50a is promptly discharged through the first drainage hole 50b when the battery 10 is tilted along the first direction M, further improving the reliability of the battery 10.

[0146] For example, when the battery 10 is used in a vehicle, the first direction M may correspond to the longitudinal direction of the vehicle, that is, the driving direction of the vehicle. The thickness direction of the first wall 31a corresponds to the height direction of the vehicle. According to the relevant design specifications of the vehicle and the actual operating conditions of the vehicle, the maximum allowable inclination angle of the vehicle in the longitudinal direction is 20°. When the vehicle is tilted 20° in the longitudinal direction, in order to discharge the electrolyte in the first groove 50a through the first drainage hole 50b in time, the maximum allowable value of w2 is 2.74h2, and the smaller the inclination angle of the vehicle in the longitudinal direction, the larger the maximum allowable value of w2. Therefore, setting w2≤2.74h2 is beneficial to ensure that the electrolyte in the first groove 50a is discharged through the first drainage hole 50b in time when the vehicle is tilted in the longitudinal direction, thereby further improving the reliability of the vehicle.

[0147] Therefore, w2 is set to be less than or equal to 2.74h2. Under the condition that the battery 10 is tilted no more than 20° along the first direction M, the electrolyte leaked from the battery cell 30 can still be discharged through the first drain hole 50b.

[0148] In some embodiments, when the battery 10 is used in a vehicle, the first direction M of the battery 10 can correspond to the length of the vehicle, the second direction N of the battery 10 can correspond to the width of the vehicle, and the thickness direction O of the battery 10 can correspond to the height of the vehicle. Furthermore, w1 and h1 can satisfy the following conditions: w1 ≤ 5.67h1, and w2 and h2 can satisfy the following conditions: w2 ≤ 2.74h2. In this way, the electrolyte in the first groove 50a can be discharged through the first drainage hole 50b during driving, regardless of whether the vehicle tilts within 20° along the length or within 10° along the width, thereby improving the reliability of the vehicle.

[0149] As shown in FIG. 6 and FIG. 7 , in some embodiments, the first groove 50 a has a plurality of first drainage holes 50 b , and the plurality of first drainage holes 50 b are arranged at intervals.

[0150] The first groove 50a has multiple first drainage holes 50b, which is beneficial to increasing the rate of electrolyte discharge in the first groove 50a. When the bottom wall of the first groove 50a is inclined relative to the horizontal direction, the electrolyte can be discharged through the first drainage holes 50b at a lower position after the inclination. This is further beneficial to timely discharge the electrolyte in the first groove 50a and reduce the risk of the electrolyte electrically connecting two adjacent busbars 40.

[0151] In some embodiments, at least one first drainage hole 50b is disposed at a corner of the first groove 50a.

[0152] The corner position of the first groove 50a can be the position where the bottom wall of the first groove 50a is close to the intersection of any two intersecting side walls. The first groove 50b can be located at any corner position of the first groove 50a.

[0153] At least one first drainage hole 50b is provided at a corner position of the first groove 50a. Then, when the battery 10 tilts in a corresponding direction, the first drainage hole 50b is located at a lower position of the first groove 50a, which is conducive to timely discharge of the electrolyte in the first groove 50a through the first drainage hole 50b.

[0154] For example, at least two first drain holes 50b may be provided at two opposite corners of the first groove 50a, respectively, so that when the battery 10 is tilted, the electrolyte in the first groove 50a can be drained out in time.

[0155] As shown in FIG. 10 , in some embodiments, the insulating member 50 further has a guide groove 50 c , and the guide groove 50 c is connected to the first groove 50 a .

[0156] Optionally, the insulating member 50 may have one, two, three or more first grooves 50 a , and the guide groove 50 c is connected to one first groove 50 a , or is connected to at least two first grooves 50 a among the multiple first grooves 50 a .

[0157] Thus, the electrolyte leaked from the battery cell 30 drips onto the insulating member 50 and first flows into the guide groove 50c and then into the first groove 50a. In this way, the electrolyte leaked from the battery cell 30 flows into the first groove 50a more promptly.

[0158] As shown in Figures 4 and 10, in some embodiments, the battery cell 30 further includes a pressure relief mechanism 34 disposed on the first wall 31a. At least a portion of the orthographic projection of the pressure relief mechanism 34 on the insulating member 50 along the thickness direction O of the first wall 31a is located within the guide groove 50c.

[0159] The pressure relief mechanism 34 can be used to explode when the internal pressure of the battery cell 30 reaches a certain threshold, allowing the gas inside the battery cell 30 to be discharged, thereby reducing the risk of explosion of the battery cell 30. If the pressure relief mechanism 34 is provided on the first wall 31a, there is also a risk of electrolyte leakage at the connection between the pressure relief mechanism 34 and the first wall 31a.

[0160] At least a portion of the orthographic projection of the pressure relief mechanism 34 on the insulating member 50 along the thickness direction O of the first wall 31a is located within the guide groove 50c. For example, the orthographic projection of the pressure relief mechanism 34 on the insulating member 50 along the thickness direction O of the first wall 31a can be entirely located within the guide groove 50c. In this way, at least a portion of the electrolyte leaking through the pressure relief mechanism 34 drips directly into the guide groove 50c under the action of gravity and can flow into the first groove 50a through the guide groove 50c.

[0161] This arrangement facilitates the electrolyte leaking from the pressure relief mechanism 34 to flow into the first groove 50 a in a timely manner, further reducing the possibility that the electrolyte leaking from the battery cell 30 will electrically connect two adjacent busbars 40 .

[0162] In some embodiments, along the thickness direction O of the first wall 31a, the orthographic projection of the pressure relief mechanism 34 on the insulating member 50 is located within the guide groove 50c, and the minimum spacing between the edge of the orthographic projection of the pressure relief mechanism 34 on the insulating member 50 and the sidewall of the guide groove 50c is a. Along the thickness direction O of the first wall 31a, the minimum spacing between the pressure relief mechanism 34 and the guide groove 50c is h3, where a ≥ 0.36h3. ​​Furthermore, h3 is the minimum spacing between the surface of the pressure relief mechanism 34 proximal to the guide groove 50c and the surface of the guide groove 50c proximal to the pressure relief mechanism 34 along the thickness direction O of the first wall 31a.

[0163] If a≥0.36h3, then a / h3 can be 0.36, 0.4, 0.5, 0.6, 0.7, 0.8, 1, 1.5 or 2, etc.

[0164] The battery may tilt during operation. When the battery is tilted at 20°, in order to ensure that the electrolyte leaked from the pressure relief mechanism 34 can still drip into the guide groove 50c, the minimum value of a is 0.36h3. ​​The smaller the tilt angle of the battery 10, the smaller the required value of a.

[0165] Therefore, setting a≥0.36h3 is beneficial to increasing the possibility that the electrolyte leaked from the pressure relief mechanism 34 falls into the guide groove 50c when the battery 10 is tilted less than 20°, which is beneficial to further improving the reliability of the battery 10.

[0166] In some embodiments, the guide groove 50c is recessed in a direction away from the first wall 31a, and along the thickness direction O of the first wall 31a, the size of the guide groove 50c is smaller than or equal to the size of the first groove 50a.

[0167] If the guide groove 50c is recessed in a direction away from the first wall 31a, the recessed direction of the guide groove 50c is the same as the recessed direction of the first groove 50a. If the guide groove 50c is recessed in the thickness direction O of the first wall 31a and its dimensions are smaller than or equal to the dimensions of the first groove 50a, the recessed depth of the guide groove 50c in the thickness direction O of the first wall 31a is smaller than or equal to the recessed depth of the first groove 50a in the thickness direction O. When the electrode terminals 33 of the battery cell 30 are positioned downward in the direction of gravity, the bottom wall of the first groove 50a is lower than the bottom wall of the guide groove 50c, facilitating smoother flow of electrolyte within the guide groove 50c into the first groove 50a. In embodiments where the bottom wall of the first groove 50a has a first drainage hole 50b, this facilitates timely discharge of electrolyte.

[0168] In some embodiments, the first wall 31a has an injection port 35 for injecting electrolyte into the housing 31. Along the thickness direction O of the first wall 31a, at least part of the positive projection of the injection port 35 on the insulating member 50 is located in the guide groove 50c.

[0169] The injection port 35 is used to inject electrolyte into the battery cell 30. After the electrolyte injection is completed, the injection port 35 is sealed. However, as the battery 10 is used for a longer time, the injection port 35 still has the risk of electrolyte leakage.

[0170] Along the thickness direction O of the first wall 31a, the orthographic projection of the liquid injection port 35 on the insulating part 50 is at least partially located in the guide groove 50c, then the orthographic projection of the liquid injection port 35 on the insulating part 50 along the thickness direction O can be partially located in the guide groove 50c, or the orthographic projection of the liquid injection port 35 along the thickness direction O is completely located in the guide groove 50c.

[0171] In this way, when the electrode terminal 33 of the battery cell 30 is arranged downward in the direction of gravity, at least part of the electrolyte leaked through the liquid filling port 35 will drip into the guide groove 50c, and then flow into the first groove 50a through the guide groove 50c. In this way, the electrolyte leaked through the liquid filling port 35 can flow into the first groove 50a through the guide groove 50c in time.

[0172] As shown in Figures 4, 8, and 9, in some embodiments, the battery cell 30 further includes a pressure relief mechanism 34 disposed on the first wall 31a. The insulating member 50 includes a second recess 50d recessed away from the first wall 31a. At least a portion of the orthographic projection of the pressure relief mechanism 34 onto the insulating member 50 along the thickness direction O of the first wall 31a is located within the second recess 50d.

[0173] At least part of the orthographic projection of the pressure relief mechanism 34 along the thickness direction O of the first wall 31a on the insulating part 50 is located in the second groove 50d. Then, part of the orthographic projection of the pressure relief mechanism 34 along the thickness direction O can be set to be located in the second groove 50d, or the entire orthographic projection of the pressure relief mechanism 34 along the thickness direction O is located in the second groove 50d.

[0174] In this way, at least part of the electrolyte leaked from the battery cell 30 through the pressure relief mechanism 34 flows directly into the second groove 50d and is stored in the second groove 50d, further reducing the risk of the electrolyte leaked from the battery cell 30 electrically connecting two adjacent busbars 40 and improving the reliability of the battery 10.

[0175] As shown in FIG. 8 , in some embodiments, the second groove 50 d has a second drainage hole 51 d , and the second drainage hole 51 d is provided through the bottom wall of the second groove 50 d .

[0176] The bottom wall of the second groove 50d is the wall portion of the second groove 50d that is arranged opposite to the first wall 31a along the thickness direction O. The second drainage hole 51d passes through the bottom wall of the second groove 50d. Therefore, after the electrolyte leaked from the battery cell 30 flows into the second groove 50d, it can flow out through the second drainage hole 51d, and the electrolyte does not need to accumulate in the second groove 50d.

[0177] Optionally, each second groove 50d can be provided with a second drainage hole 51d, or some of the second grooves 50d can be provided with a second drainage hole 51d, a second groove 50d can be provided with one, two or more second drainage holes 51d, and multiple second drainage holes 51d of a second groove 50d can be arranged at intervals.

[0178] It is understandable that by providing the second drain hole 51 d and timely draining the electrolyte in the second groove 50 d , the risk of the electrolyte electrically connecting two adjacent busbars 40 and causing a high-voltage short circuit inside the battery 10 is further reduced.

[0179] 9 , in some embodiments, the insulating member 50 further comprises a communication channel 50 e , which connects the first groove 50 a and the second groove 50 d .

[0180] It is understood that the depths of the first groove 50a and the second groove 50d along the thickness direction O can be set as needed to control the flow direction of the electrolyte. For example, the depth of the first groove 50a along the thickness direction O can be set to be greater than the dimension of the second groove 50d along the thickness direction O. In this way, the electrolyte in the second groove 50d will flow into the first groove 50a through the connecting flow channel 50e. The electrolyte will only be stored in the second groove 50d when the liquid level of the first groove 50a is flush with the bottom wall of the second groove 50d.

[0181] The connecting channel 50e connects the first groove 50a and the second groove 50d, which can realize the mutual flow of electrolyte in the first groove 50a and the second groove 50d, so as to balance the storage volume of electrolyte in the first groove 50a and the second groove 50d, and reduce the risk of electrolyte overflow in one of the first groove 50a and the second groove 50d while the other has a smaller electrolyte storage volume, so that the first groove 50a and the second groove 50d can accommodate more electrolyte, further reducing the risk of electrolyte electrically connecting two adjacent busbars 40.

[0182] As shown in Figures 6, 8, and 10, in some embodiments, the battery 10 includes a plurality of battery cells 30 arranged along a first direction M. The insulating member 50 has at least one first blocking protrusion 52. The first blocking protrusion 52 extends along a second direction N and is located on a side of the insulating member 50 adjacent to the first wall 31a. The second direction N intersects the first direction M. Exemplarily, the first direction M and the second direction N are perpendicular to each other. The first blocking protrusion 52 is located between two first grooves 50a corresponding to the first walls 31a of two battery cells 30 adjacent to each other along the first direction M.

[0183] The first blocking protrusion 52 is provided to protrude in a direction toward the battery cells 30. The first blocking protrusion 52 can be formed by a process such as injection molding or stamping. The multiple battery cells 30 are arranged at least along the first direction M. The multiple battery cells 30 can be arranged only along the first direction M, or the multiple battery cells 30 can also be arranged along other directions, such as the second direction N.

[0184] The first blocking protrusion 52 extends along the second direction N, and the first blocking protrusion 52 can prevent the electrolyte from flowing along the first direction M between two adjacent first grooves 50 a.

[0185] In this way, after the electrolyte leaked from a battery cell 30 drips onto the insulating part 50, it is difficult to flow into at least a partial area corresponding to another adjacent battery cell 30 and the insulating part 50 due to the blocking effect of the first blocking protrusion 52, which is beneficial to further reduce the possibility of the electrolyte electrically connecting two adjacent busbars 40 and causing an internal short circuit in the battery 10.

[0186] Continuing to refer to Figures 6, 8, and 10, in some embodiments, multiple battery cells 30 are arranged in a matrix along the first direction M and the second direction N. The insulating member 50 has at least one second blocking protrusion 53. The second blocking protrusion 53 extends along the first direction M and is located on a side of the insulating member 50 adjacent to the first wall 31a. The second blocking protrusion 53 intersects with the first blocking protrusion 52. The second blocking protrusion 53 is located between two first grooves 50a corresponding to the first walls 31 of two adjacent battery cells 30 along the second direction N.

[0187] In this manner, multiple battery cells 30 are arranged along the first direction M and the second direction N, and a second blocking protrusion 53 can be provided between the first grooves 50a corresponding to any two adjacent battery cells 30 along the second direction N, or a second blocking protrusion 53 can be provided between the first grooves 50a corresponding to two partially adjacent battery cells 30 along the second direction N. The first blocking protrusion 52 and the second blocking protrusion 53 intersect to form a confined space, so that electrolyte leaked from a corresponding battery cell 30 flows only within the corresponding confined space and into the corresponding first groove 50a, without flowing into the first groove 50a corresponding to an adjacent battery cell 30.

[0188] Therefore, the insulating part 50 is provided with a second blocking protrusion 53, and the second blocking protrusion 53 is provided between the first grooves 50a corresponding to the first walls 31a of two adjacent battery cells 10 along the second direction N. The second blocking protrusion 53 can be used to limit the flow of electrolyte along the second direction N, which is beneficial to further reduce the possibility of electrolyte leaking from the battery cell 30 electrically connecting two adjacent busbars 40, thereby further improving the reliability performance of the battery 10.

[0189] As shown in Figures 13, 14 and 15, in some embodiments, the battery 10 includes a plurality of battery cells 30, and the plurality of battery cells 30 are arranged in a matrix along a first direction M and a second direction N. The battery 10 also includes at least one insulating isolation member 60, which extends along the first direction M and is arranged between two adjacent busbars 40 along the second direction N.

[0190] The insulating isolation member 60 is arranged between two adjacent busbars 40 along the second direction N, and the insulating isolation member 60 can realize the insulation isolation of the two adjacent busbars 40 along the second direction N, which is beneficial to increase the creepage distance of the two adjacent busbars 40, reduce the risk of mutual electrical connection between the two, and improve the reliability performance of the battery.

[0191] Continuing to refer to FIG. 13 , FIG. 14 and FIG. 15 , in some embodiments, the insulating spacer 60 abuts against the first wall 31 of the battery cell 30 and / or the insulating member 50 .

[0192] Optionally, the insulating spacer 60 may only abut the first wall 31 of the battery cell 30 , or the insulating spacer 60 may only abut the insulating member 50 . Of course, a portion of the insulating spacer 60 may abut the first wall 31 and the other portion may abut the insulating member 50 .

[0193] The insulating spacer 60 abuts against the first wall 31 or the insulating member 50, and the insulating spacer 60 and the first wall 31 can be connected by bonding, or the insulating spacer 60 can be bonded to the insulating member 50. Of course, the insulating spacer 60 can also be in contact only under the action of external pressure.

[0194] In the embodiment where the insulating member 50 is provided with the second blocking protrusion 53 , an insulating spacer 60 may also be provided to abut against a side of the second blocking protrusion 53 facing away from the first wall 51 a .

[0195] Providing the insulating spacer 60 in contact with at least one of the first wall 31 and the insulating member 50 is beneficial for improving the structural compactness of the battery 10 , and can further improve the insulation effect of two adjacent busbars 40 through the insulating spacer 60 .

[0196] Continuing to refer to FIG. 13 , FIG. 14 and FIG. 15 , in some embodiments, the insulating spacer 60 abuts against the first walls 31 a of two battery cells 30 adjacent to each other along the second direction N.

[0197] In this way, the insulating spacer 60 can be used to achieve insulation isolation of structures such as the electrode terminals 33 of two adjacent battery cells 30, which is beneficial to reducing the amount of the insulating spacer 60 used and reducing the weight and production cost of the battery 10.

[0198] Continuing to refer to FIG. 13 , FIG. 14 and FIG. 15 , in some embodiments, the battery further includes a protective member 70 . The protective member 70 is disposed on a side of the insulating spacer 60 facing away from the battery cell 30 , and the insulating spacer 60 abuts against the protective member 70 .

[0199] The protective member 70 may be in any shape, for example, the protective member 70 may be in a plate shape. Alternatively, the protective member 70 may be formed as a part of the box of the battery 10 , for example, the protective member 70 may be the bottom plate of the box of the battery 10 .

[0200] The insulating spacer 60 may abut between the first wall 31a of the battery cell 30 and the protective member 70, or between the insulating member 50 and the protective member 70. Alternatively, the insulating spacer 60 may be bonded to the protective member 70. This increases the electrical clearance and creepage distance within the battery 10, further improving the reliability of the battery 10. The insulating spacer 60 also enhances the overall structural strength of the battery 10.

[0201] Continuing to refer to FIG. 13 , FIG. 14 and FIG. 15 , in some embodiments, a gap is provided between the protection member 70 and the current collector 40 .

[0202] The gap between the protective member 70 and the manifold 40 can be selected based on actual needs. When the protective member is subjected to loads such as impact and vibration, the protective member 70 can withstand a certain load and deform toward the manifold 40. The gap between the protective member 70 and the manifold 40 can be used as a deformation avoidance space for the protective member 70, providing a certain buffering effect on the deformation of the protective member 70, reducing the risk of damage to the manifold 40 from external impact or vibration loads, and providing a certain protective effect on the manifold 40.

[0203] In some embodiments, the electrode terminals 33 of the battery cells 30 are disposed downward along the direction of gravity.

[0204] The electrode terminal 33 is positioned downward in the direction of gravity. This position places the electrode terminal 33 at the very bottom of the battery cell 30's housing 31. The insulating member 50 is positioned below the battery cell 30 in the direction of gravity, and the first recess 50a is also recessed downward in the direction of gravity. This allows electrolyte leaking from the junction between the electrode terminal 33 and the first wall 31a to drip onto the insulating member 50 under the influence of gravity and flow into the first recess 50a. This arrangement facilitates the timely flow of electrolyte into the first recess 50a.

[0205] An embodiment of the present application further provides an electrical device, comprising the battery 10 in any of the above embodiments, wherein the battery 10 is used to provide electrical energy to the electrical device, and the electrode terminals 33 of the battery cells 30 are arranged downward along the direction of gravity.

[0206] The electrical device provided in the embodiment of the present application adopts the battery 10 provided in the embodiment of the present application. In the event of electrolyte leakage in the battery cell 30, the first groove 50a can be used to store the electrolyte, thereby reducing the possibility of the electrolyte electrically connecting two adjacent busbars 40 inside the battery 10 and causing a high-voltage short circuit inside the battery 10, which is beneficial to improving the reliability of the electrical device.

[0207] The present embodiment provides a battery 10 comprising a battery cell 30, a current busbar 40, an insulating member 50, an insulating spacer 60, and a protective member 70. The battery cell 30 includes a housing 31, electrode terminals 33, and a pressure relief mechanism 34. The housing 31 has a first wall 31a. The electrode terminals 33 and the pressure relief mechanism 34 are disposed on the first wall 31a, with the electrode terminals 33 facing downward in the direction of gravity. The current busbar 40 is electrically connected to the electrode terminals 33. The insulating member 50 is disposed on the side of the busbar 40 facing the electrode terminals 33 and covers at least a portion of the first wall 31a. The insulating member 50 has a first groove 50a that is recessed away from the first wall 31a. The first wall 31a is provided with at least four first grooves 50a, including four first grooves 50a disposed corresponding to two pairs of diagonal corners of the first wall 31a. The first groove 50a has a first drainage hole 50b that extends through the bottom wall of the first groove 50a. The first groove 50a has a first sidewall 54 extending along a first direction M and a second sidewall 55 extending along a second direction N. The first sidewall 54 and the second sidewall 55 are adjacent to each other and are both connected to the outer periphery of the bottom wall of the first groove 50a. The first sidewall 54 has a dimension h1 along the thickness direction O of the first wall 31a. The minimum spacing between the edge of the first drainage hole 50b and the first sidewall 54 along the second direction N is w1, where w1 ≤ 5.67h1. The second sidewall 55 has a dimension h2 along the thickness direction O of the first wall 31a. The minimum spacing between the edge of the first drainage hole 50b and the second sidewall 55 along the first direction M is w2, where w2 ≤ 2.74h2. The first direction M, the second direction N, and the thickness direction O of the first wall 31a intersect with each other. For example, the first direction M, the second direction N, and the thickness direction O of the first wall 31a are perpendicular to each other. The insulating member 50 further includes a guide groove 50c, which is recessed away from the first wall 31a and communicates with the first recess 50a. The orthographic projection of the pressure relief mechanism 34 on the insulating member 50 along the thickness direction O of the first wall 31a is located within the guide groove 50c. The minimum spacing between the edge of the orthographic projection of the pressure relief mechanism 34 on the insulating member 50 and the sidewall of the guide groove 50c is a. Along the thickness direction O of the first wall 31a, the minimum spacing between the pressure relief mechanism 34 and the guide groove 50c is h3, where a ≥ 0.36h3. ​​Along the thickness direction O of the first wall 31a, the size of the guide groove 50c is less than or equal to the size of the first recess 50a. The battery 10 includes a plurality of battery cells 30, which are arranged in a matrix along a first direction M and a second direction N. The insulating member 50 has at least one first blocking protrusion 52 and at least one second blocking protrusion 53. The first blocking protrusion 52 extends along the second direction N and is located on the side of the insulating member 50 close to the first wall 31a. The first blocking protrusion 52 is located between two first grooves 50a corresponding to the first walls 31a of two adjacent battery cells 30 along the first direction M.The second blocking protrusion 53 extends along the first direction M and is located on a side of the insulating member 50 proximal to the first wall 31a. The second blocking protrusion 53 intersects with the first blocking protrusion 52 and is located between two first grooves 50a corresponding to the first walls 31a of two adjacent battery cells 30 along the second direction N. The insulating spacer 60 extends along the first direction M and is located between two adjacent busbars 40 along the second direction N. The insulating spacer 60 abuts against the first walls 31a of two adjacent battery cells 30 along the second direction N. The protective member 70 is disposed on a side of the insulating spacer 60 facing away from the battery cells 30. The insulating spacer 60 abuts against the protective member 70, with a gap between the protective member 70 and the busbar 40.

[0208] The battery 10 provided in the embodiment of the present application can utilize the first groove 50a to accommodate the electrolyte leaked from the battery cell 30. When the first wall 31a of the battery cell 30 in the battery 10 is placed horizontally or tilted to a certain extent relative to the horizontal direction, the electrolyte can be discharged through the first drainage hole 50d, thereby reducing the risk of the electrolyte electrically connecting two adjacent busbars 40 and causing a high-voltage short circuit inside the battery 10. At the same time, it is beneficial to increase the electrical clearance and creepage distance between the two adjacent busbars 40, which is beneficial to improving the reliability performance of the battery 10.

[0209] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0210] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery comprising: A battery cell, comprising a housing and an electrode terminal, wherein the housing has a first wall, and the electrode terminal is disposed on the first wall; A busbar electrically connected to the electrode terminals; The insulating member is disposed on a side of the busbar facing the electrode terminal and covers at least a portion of the first wall. The insulating member has a first groove recessed in a direction away from the first wall.

2. The battery according to claim 1, wherein The insulating member has a second wall facing one side of the first wall. The second wall surrounds at least a portion of the circumference of the first groove. From the circumference of the first groove to the outside, the second wall is inclined in a direction close to the first wall.

3. The battery according to claim 1 or 2, wherein: The battery includes a plurality of battery cells, the insulating member is provided with a plurality of first grooves, and the first wall of each of the battery cells is arranged opposite to at least one of the first grooves.

4. The battery according to any one of claims 1 to 3, wherein: The first wall is correspondingly provided with at least two first grooves, and the at least two first grooves include two first grooves respectively provided corresponding to the diagonals of the first wall.

5. The battery according to claim 4, wherein At least four first grooves are correspondingly arranged on the first wall, and the at least four first grooves include four first grooves respectively arranged corresponding to two pairs of diagonal corners of the first wall.

6. The battery according to any one of claims 1 to 5, wherein: The first groove has a first liquid drainage hole, and the first liquid drainage hole is arranged through the bottom wall of the first groove.

7. The battery according to claim 6, wherein The first groove has a first side wall extending along a first direction and a second side wall extending along a second direction, the first side wall is connected to the second side wall, and the first side wall and the second side wall are both connected to the outer periphery of the bottom wall of the first groove; The dimension of the first side wall along the thickness direction of the first wall is h1, and the minimum distance between the edge of the first drainage hole and the first side wall along the second direction is w1, w1≤5.67h1; and / or the dimension of the second side wall along the thickness direction of the first wall is h2, and the minimum distance between the edge of the first drainage hole and the second side wall along the first direction is w2, w2≤2.74h2; The first direction, the second direction and the thickness direction of the first wall intersect each other.

8. The battery according to claim 6 or 7, wherein: The first groove has a plurality of the first liquid drainage holes, and the plurality of the first liquid drainage holes are arranged at intervals.

9. The battery according to any one of claims 6 to 8, wherein: At least one of the first liquid drainage holes is disposed at a corner of the first groove.

10. The battery according to any one of claims 1 to 9, wherein The insulating member further has a guide groove, and the guide groove is connected to the first groove.

11. The battery according to claim 10, wherein The battery cell further includes a pressure relief mechanism, which is disposed on the first wall, and at least a portion of an orthographic projection of the pressure relief mechanism on the insulating member along a thickness direction of the first wall is located within the guide groove.

12. The battery according to claim 11, wherein Along the thickness direction of the first wall, the orthographic projection of the pressure relief mechanism on the insulating member is located in the guide groove, and the minimum distance between the edge of the orthographic projection of the pressure relief mechanism on the insulating member and the side wall of the guide groove is a. Along the thickness direction of the first wall, the minimum distance between the pressure relief mechanism and the guide groove is h3, and a≥0.36h3.

13. The battery according to any one of claims 10 to 12, wherein: The guide groove is recessed in a direction away from the first wall, and along the thickness direction of the first wall, a size of the guide groove is smaller than or equal to a size of the first groove.

14. The battery according to any one of claims 10 to 13, wherein: The first wall has a liquid injection port, which is used to inject electrolyte into the shell. Along the thickness direction of the first wall, at least part of the positive projection of the liquid injection port on the insulating member is located in the guide groove.

15. The battery according to any one of claims 1 to 14, wherein The battery cell also includes a pressure relief mechanism, which is arranged on the first wall. The insulating member has a second groove that is recessed in a direction away from the first wall. At least part of the positive projection of the pressure relief mechanism on the insulating member along the thickness direction of the first wall is located in the second groove.

16. The battery according to claim 15, wherein The second groove has a second liquid drainage hole, and the second liquid drainage hole is arranged through the bottom wall of the second groove.

17. The battery according to claim 15 or 16, wherein: The insulating member further has a communication channel, and the communication channel communicates the first groove and the second groove.

18. The battery according to any one of claims 1 to 17, wherein: The battery comprises a plurality of battery cells, the plurality of battery cells are arranged along a first direction, the insulating member has at least one first blocking protrusion, the first blocking protrusion extends along a second direction and is located on a side of the insulating member close to the first wall, and the second direction intersects with the first direction; The first blocking protrusion is located between two first grooves corresponding to the first walls of two battery cells adjacent to each other along the first direction.

19. The battery according to claim 18, wherein The plurality of battery cells are arranged in a matrix along the first direction and the second direction, the insulating member has at least one second blocking protrusion, the second blocking protrusion extends along the first direction and is located on a side of the insulating member close to the first wall, and the second blocking protrusion intersects with the first blocking protrusion; The second blocking protrusion is located between two first grooves corresponding to the first walls of two battery cells adjacent to each other along the second direction.

20. The battery according to any one of claims 1 to 19, wherein The battery comprises a plurality of battery cells, and the plurality of battery cells are arranged in a matrix along a first direction and a second direction, and the first direction intersects with the second direction; The battery further includes at least one insulating spacer extending along the first direction, and the insulating spacer is disposed between two adjacent current collectors along the second direction.

21. The battery according to claim 20, wherein The insulating spacer abuts against the first wall of the battery cell and / or the insulating member.

22. The battery according to claim 21, wherein The insulating spacer abuts against the first walls of two battery cells adjacent to each other along the second direction.

23. The battery according to any one of claims 20 to 22, wherein: The battery further includes a protective member, which is disposed on a side of the insulating spacer away from the battery cell, and the insulating spacer abuts against the protective member.

24. The battery according to claim 23, wherein A gap is provided between the protection member and the current collecting member along a thickness direction of the first wall.

25. The battery according to any one of claims 1 to 24, wherein The electrode terminals of the battery cells are arranged downward along a gravity direction.

26. An electrical device, comprising the battery according to any one of claims 1 to 25, wherein the battery is used to provide electrical energy, and the electrode terminals of the battery cells are arranged downward along the direction of gravity.

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