Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell, an electrode assembly and an insulating part; the shell comprises a first wall, and a liquid injection hole is formed in the first wall; the electrode assembly is accommodated in the shell; the insulating part is arranged between the first wall and the electrode assembly in the thickness direction of the first wall, and a first hole corresponding to the liquid injection hole in position is formed in the insulating part; wherein the insulating part and / or the first wall are / is provided with a flow channel, the flow channel is communicated with the liquid injection hole, and the flow channel is configured to guide the electrolyte injected from the liquid injection hole to the edge of the insulating part, so that the electrolyte enters the battery monomer from the edge of the insulating part. According to the technical scheme provided by the invention, the production efficiency of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular, a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, in addition to improving the performance of the battery, such as energy density, service life, reliability, improving the production efficiency of the battery is also an important problem that cannot be ignored. Therefore, how to improve the production efficiency of the battery is a technical problem that needs to be solved in the battery technology. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery monomer, a battery device and a power utilization device to improve the production efficiency of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell, an electrode assembly and an insulating piece; the shell comprises a first wall, the first wall is provided with a liquid injection hole; the electrode assembly is contained in the shell; along the thickness direction of the first wall, the insulating piece is arranged between the first wall and the electrode assembly, and the insulating piece is provided with a first hole corresponding to the position of the liquid injection hole; wherein the insulating piece and / or the first wall is provided with a flow channel, the flow channel is in communication with the liquid injection hole, and the flow channel is configured to guide the electrolyte injected through the liquid injection hole to the edge of the insulating piece, so that the electrolyte enters the inside of the battery monomer from the edge of the insulating piece.

[0006] In the above technical solution, the insulating piece and / or the first wall is provided with a flow channel, the flow channel is in communication with the liquid injection hole, so that part of the electrolyte injected through the liquid injection hole enters the inside of the battery monomer through the first hole, and the other part enters the inside of the battery monomer through the flow channel from the edge of the insulating piece. Thus, compared with the case where the electrolyte injected through the liquid injection hole enters the inside of the battery monomer only through the first hole, on the one hand, the electrolyte can enter the inside of the battery monomer more uniformly, reducing the time for the electrolyte to soak the electrode assembly; on the other hand, the flow channel can distribute the electrolyte injected through the liquid injection hole, reducing the risk of congestion of the electrolyte at the first hole during rapid injection, reducing the injection time of the electrolyte, thereby improving the production efficiency of the battery monomer.

[0007] In some embodiments, the flow channel comprises a first sub-flow channel and a second sub-flow channel, the first sub-flow channel is arranged along the edge of the first wall and / or the edge of the insulation piece, and the second sub-flow channel is in communication with the first sub-flow channel and the liquid injection hole.

[0008] In the above technical solution, the first sub-flow channel is arranged along the edge of the first wall and / or the edge of the insulation piece, thereby increasing the area of the flow channel that can be directly or indirectly connected with the edge of the first wall and / or the edge of the insulation piece through other structures, which is advantageous for increasing the flow rate of the flow channel that can be shunted to the electrolyte injected through the liquid injection hole, thereby reducing the risk of congestion of the electrolyte at the first hole during rapid liquid injection.

[0009] In some embodiments, the inner surface of the first wall is provided with a first groove and a second groove, the first groove is arranged along the edge of the first wall, and the second groove is in communication with the liquid injection hole and the first groove; the side of the insulation piece facing the first wall and the first groove form the first sub-flow channel, and the side of the insulation piece facing the first wall and the second groove form the second sub-flow channel.

[0010] In the above technical solution, by arranging the first groove and the second groove on the inner surface of the first wall, and by the side of the insulation piece facing the first wall and the first groove forming the first sub-flow channel, and by the side of the insulation piece facing the first wall and the second groove forming the second sub-flow channel, only the inner surface of the first wall needs to be additionally processed, thereby reducing the number of parts that need to be processed, thereby reducing the processing procedures of the battery monomer and reducing the production cost of the battery monomer.

[0011] In some embodiments, the side of the insulation piece facing the first wall is provided with a third groove and a fourth groove, the third groove is arranged along the edge of the insulation piece, and the fourth groove is in communication with the liquid injection hole and the third groove; the inner surface of the first wall and the third groove form the first sub-flow channel, and the inner surface of the first wall and the fourth groove form the second sub-flow channel.

[0012] In the above technical solution, by arranging the third groove and the fourth groove on the side of the insulation piece facing the first wall, and by the inner surface of the first wall and the first groove forming the first sub-flow channel, and by the side of the inner surface of the first wall and the second groove forming the second sub-flow channel, only the side of the insulation piece facing the first wall needs to be additionally processed, thereby reducing the number of parts that need to be processed, thereby reducing the processing procedures of the battery monomer and reducing the production cost of the battery monomer.

[0013] In some embodiments, the insulating member is provided with a first protrusion and a second protrusion on a side facing away from the first wall, the third groove is in position correspondence with the first protrusion, and the fourth groove is in position correspondence with the second protrusion.

[0014] In the above technical solution, the third groove is in position correspondence with the first protrusion, so that the first protrusion can increase the thickness of the area of the insulating member provided with the third groove, thereby reducing the risk of the part of the insulating member being thin in thickness and weak in structural strength and thus being prone to breakage due to the provision of the third groove, thereby improving the reliability of the battery cell.

[0015] In some embodiments, the electrode assembly comprises a main body and a tab, the tab being provided on a side of the main body facing the first wall; wherein on the inner surface of the first wall, the orthogonal projection of the tab does not overlap with the orthogonal projection of the first protrusion, and the orthogonal projection of the tab does not overlap with the orthogonal projection of the second protrusion.

[0016] In the above technical solution, on the inner surface of the first wall, the orthogonal projection of the tab does not overlap with the orthogonal projection of the first protrusion, and the orthogonal projection of the tab does not overlap with the orthogonal projection of the second protrusion, so that the first protrusion and the second protrusion do not interfere with the tab in the thickness direction of the first wall, thereby eliminating the need to increase the distance between the main body of the electrode assembly and the inner surface of the first wall in the thickness direction for avoiding the first protrusion and the second protrusion when installing the tab, so that the shell can accommodate an electrode assembly with a larger size in the thickness direction under the premise that the size of the shell in the thickness direction remains unchanged, thereby facilitating the improvement of the energy density of the battery cell.

[0017] In some embodiments, the insulating member is provided with a third protrusion and a fourth protrusion on a side facing the first wall, the first sub-flow channel is located in the third protrusion, and the second sub-flow channel is located in the fourth protrusion.

[0018] In the above technical solution, the first sub-flow channel is located in the third protrusion, so that the inner surface of the first sub-flow channel is all arranged in the insulating member, thereby reducing the risk of foreign matter falling into the first sub-flow channel and blocking the first sub-flow channel during the manufacturing process of the battery cell; the second sub-flow channel is located in the fourth protrusion, so that the inner surface of the second sub-flow channel is all arranged in the insulating member, thereby reducing the risk of foreign matter falling into the second sub-flow channel and blocking the first sub-flow channel during the manufacturing process of the battery cell.

[0019] In some embodiments, the inner surface of the first wall is partially recessed to form a first accommodating groove and a second accommodating groove, at least part of the third protrusion is accommodated in the first accommodating groove, and at least part of the fourth protrusion is accommodated in the second accommodating groove.

[0020] In the above technical solution, at least part of the third protrusion is accommodated in the first accommodating groove, and at least part of the fourth protrusion is accommodated in the second accommodating groove, thereby reducing the size of the first wall and the insulating member in the thickness direction, so that the shell can accommodate an electrode assembly with a larger size in the thickness direction without changing the size of the shell in the thickness direction, thereby facilitating the improvement of the energy density of the battery cell.

[0021] In some embodiments, the inner surface of the first wall is provided with a first groove and a second groove, the first groove is arranged along the edge of the first wall, and the second groove is in communication with the liquid injection hole and the first groove; the side of the insulating member facing the first wall is provided with a third groove and a fourth groove, the third groove is arranged along the edge of the insulating member, and the fourth groove is in communication with the liquid injection hole and the third groove; the first groove and the third groove jointly form the first sub-flow channel, and the second groove and the fourth groove jointly form the second sub-flow channel.

[0022] In the above technical solution, the first groove and the third groove jointly form the first sub-flow channel, thereby increasing the cross-sectional area of the first flow channel and the flow capacity of the first sub-flow channel relative to the case where the first sub-flow channel is formed by only the first groove or the third groove. The second groove and the fourth groove jointly form the second sub-flow channel, thereby increasing the cross-sectional area of the second flow channel relative to the case where the second sub-flow channel is formed by only the second groove or the fourth groove. In summary, the shunting capacity of the flow channel to the electrolyte injected through the liquid injection hole is improved, thereby further reducing the risk of electrolyte congestion at the first hole during rapid injection, reducing the injection time of the electrolyte, and thereby improving the production efficiency of the battery cell.

[0023] In some embodiments, the insulating member includes an insulating body and a fifth protrusion, the fifth protrusion protrudes from the side of the insulating body facing the electrode assembly in the thickness direction, the fifth protrusion is provided with a first gas permeable hole penetrating through the fifth protrusion in a first direction, and the first direction is perpendicular to the thickness direction; wherein the first gas permeable hole is in communication with the flow channel.

[0024] In the technical scheme, when the battery monomer is in thermal runaway and the pressure relief mechanism is actuated, the gas can pass through the first gas passage hole and the fifth convex part to the pressure relief mechanism, the first gas passage hole and the flow channel are communicated, the electrolyte can be injected into the battery monomer in the injection process through the first gas passage hole, the electrolyte can be more uniformly injected into the battery monomer, the time for the electrolyte to soak the electrode assembly is reduced, the injection time of the electrolyte is reduced, and the production efficiency of the battery monomer is improved.

[0025] In some embodiments, the fifth convex part includes a first sub-convex part, a second sub-convex part and a third sub-convex part arranged at intervals along the first direction; along the first direction, the first sub-convex part and the third sub-convex part are arranged at two ends of the insulating body respectively; and along the first direction, the first hole is located between the first sub-convex part and the second sub-convex part.

[0026] In the technical scheme, since the first hole is located between the first sub-convex part and the second sub-convex part, the electrolyte injected into the battery monomer through the first hole is difficult to bypass the second sub-convex part and enter between the second sub-convex part and the third sub-convex part, so that the electrolyte injected into the battery monomer through the first hole soaks the electrode assembly slowly, therefore, the flow channel is communicated with the first gas passage hole of the second sub-convex part and the first gas passage hole of the third sub-convex part, so that the flow channel can guide the electrolyte injected through the liquid injection hole to between the second sub-convex part and the third sub-convex part, so that the electrolyte can more uniformly soak the electrode assembly, the time for the electrolyte to soak the electrode assembly is reduced, and the production efficiency of the battery monomer is improved.

[0027] In some embodiments, the first wall is provided with a pressure relief mechanism, and a side of the insulating part facing the first wall is recessed to form an avoidance groove corresponding to the pressure relief mechanism; the avoidance groove is arranged at the second sub-convex part and communicated with the first gas passage hole of the second sub-convex part; and the flow channel is communicated with the avoidance groove.

[0028] In the technical scheme, the flow channel is communicated with the avoidance groove, so that the flow channel is communicated with the first gas passage hole of the second sub-convex part, and the structure is simple and easy to realize.

[0029] In some embodiments, a bottom wall of the avoidance groove is provided with a second gas passage hole penetrating through the bottom wall along the thickness direction.

[0030] In the technical solution, when the battery monomer is in thermal runaway and the pressure relief mechanism is actuated, the second gas vent hole can facilitate the gas to enter the avoidance groove through the second gas vent hole to move the pressure relief mechanism; the flow channel is communicated with the avoidance groove to make the flow channel communicated with the second gas vent hole, and then the flow channel can guide the electrolyte injected through the liquid injection hole to the second gas vent hole, so that the electrolyte can more evenly soak the electrode assembly, the time for the electrolyte to soak the electrode assembly is reduced, and the production efficiency of the battery monomer is improved.

[0031] In some embodiments, the insulating piece includes an insulating body and a fifth protruding part protruding from the side of the insulating body facing the electrode assembly in the thickness direction, and the fifth protruding part is provided with a first gas vent hole penetrating through the fifth protruding part in the thickness direction; wherein the first gas vent hole is communicated with the flow channel.

[0032] In the technical solution, the electrolyte is injected into the battery monomer through the first gas vent hole in the liquid injection process, so that the electrolyte can more evenly enter the inside of the battery monomer. Since the first gas vent hole penetrates through the fifth protruding part in the thickness direction, the flow path of the electrolyte is reduced, the injection time of the electrolyte is reduced, and the production efficiency of the battery monomer is improved.

[0033] In some embodiments, the insulating piece further includes a shielding part, and the shielding part is arranged in the first hole, and at least part of the shielding part shields the first hole.

[0034] In the technical solution, at least part of the shielding part shields the first hole, so that when the electrolyte enters the first cavity through the first hole in the thickness direction of the first wall, the electrolyte will contact the shielding part, so that the shielding part hinders the flow of the electrolyte, thereby reducing the flow degree of the electrolyte, and increasing the risk of congestion of the electrolyte at the first hole during rapid liquid injection. Therefore, the flow channel is arranged on the insulating piece and / or the first wall, and the flow channel is communicated with the liquid injection hole, so that part of the electrolyte injected through the liquid injection hole enters the inside of the battery monomer through the first hole during liquid injection, and the other part enters the inside of the battery monomer through the edge of the insulating piece through the flow channel, so that the electrolyte injected through the liquid injection hole is divided by the flow channel, the risk of congestion of the electrolyte at the first hole during rapid liquid injection is reduced, the injection time of the electrolyte is reduced, and the production efficiency of the battery monomer is improved.

[0035] In some embodiments, the shell includes a shell body having an opening and an end cover covering the opening, and the first wall is the end cover.

[0036] In the technical solution, the opening is designed to facilitate the accommodation of the electrode assembly in the shell through the opening, and the end cover covers the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly, and thus the reliability of the battery monomer is improved.

[0037] In a second aspect, the embodiments of the present application further provide a battery device comprising the battery monomer.

[0038] In a third aspect, the embodiments of the present application further provide a power consuming device comprising the battery monomer or the battery device, and the battery monomer is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0040] Figure 1 The structural diagram of a vehicle is provided for some embodiments of the present application.

[0041] Figure 2 The structural explosion diagram of a battery device is provided for some embodiments of the present application.

[0042] Figure 3 The structural explosion diagram of a battery monomer is provided for some embodiments of the present application.

[0043] Figure 4 The structural explosion diagram of a first wall of a first battery monomer and a first insulating member is provided for some embodiments of the present application.

[0044] Figure 5 The structural diagram of a first wall of a first battery monomer is provided for some embodiments of the present application.

[0045] Figure 6 The sectional view of a first battery monomer is provided for some embodiments of the present application.

[0046] Figure 7 The structural explosion diagram of a first wall of a second battery monomer and a first insulating member is provided for some embodiments of the present application.

[0047] Figure 8 The structural diagram of a first wall of a second battery monomer is provided for some embodiments of the present application.

[0048] Figure 9 The sectional view of a second battery monomer is provided for some embodiments of the present application.

[0049] Figure 10 An exploded view of a structure of a first wall of a third battery monomer and a first insulation piece provided for some embodiments of the present application;

[0050] Figure 11 A structure diagram of a first wall of a third battery monomer provided for some embodiments of the present application;

[0051] Figure 12 A cross-sectional view of a third battery monomer provided for some embodiments of the present application;

[0052] Figure 13 A cross-sectional view of a fourth battery monomer provided for some embodiments of the present application;

[0053] Figure 14 A structure diagram of a first wall provided for some embodiments of the present application;

[0054] Figure 15 A structure diagram of an insulation piece provided for some embodiments of the present application.

[0055] Icon: 1000-vehicle; 100-battery device; 10-box body; 11-first box body; 12-second box body; 20-battery monomer; 201-flow channel; 201A-first sub-flow channel; 201B-second sub-flow channel; 21-outer shell; 21A-shell body; 21B-end cover; 211-first wall; 211A-liquid injection hole; 211B-plugging piece; 211C-second groove; 211D-first groove; 211E-first accommodating groove; 211F-second accommodating groove; 2111-first region; 2112-second region; 22-insulation piece; 220-avoidance hole; 22A-first hole; 22B-shielding part; 22C-third groove; 22D-fourth groove; 221-insulation body; 2211-third region; 2212-fourth region; 222-fifth protruding part; 2221-first sub-protruding part; 2222-second sub-protruding part; 2223-third sub-protruding part; 222A-first air permeation hole; 222B-air chamber cavity; 222C-avoidance groove; 222D-avoidance part; 222E-second air permeation hole; 223-first protruding part; 224-second protruding part; 225-third protruding part; 226-fourth protruding part; 23-electrode assembly; 231-main body; 232-tab; 24-electrode terminal; 25-adaptor; 26-pressure relief mechanism; 200-controller; 300-motor; X-thickness direction; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0058] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0059] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0061] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0062] As used in this application, the term "plurality" means two or more (including two).

[0063] In the description of embodiments of the present application, the term "plurality" means two or more (including two), and by analogy, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0064] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0065] The battery cell includes, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0066] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0067] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0068] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0069] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0070] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material arranged on at least one surface of the negative electrode current collector.

[0071] As an example, the negative electrode current collector has two opposite surfaces in its own thickness direction, and the negative electrode active material is arranged on any one or both of the two opposite surfaces of the negative electrode current collector.

[0072] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0073] In some embodiments, the separator is a separator film. The separator film can be selected from any known porous structure separator film with good chemical stability and mechanical stability.

[0074] As an example, the material of the separation film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separation film can be a single layer film or a multi-layer composite film. When the separation film is a multi-layer composite film, the materials of the layers can be the same or different. The separation member can be a separate component located between the positive and negative electrodes or can be attached to the surfaces of the positive and negative electrodes.

[0075] In some embodiments, the separation member is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0076] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0077] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorophosphoric oxalate, and lithium tetrafluorophosphoric oxalate.

[0078] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0079] In some embodiments, the electrode assembly is in a stack structure.

[0080] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0081] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0082] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0083] As an example, a plurality of separation members can be provided and disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0084] As an example, the separation member can be continuously provided and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0085] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0086] In some embodiments, the electrode assembly is provided with a tab, which can conduct current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0087] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0088] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0089] The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0090] In the related art, the battery cell generally includes a housing and an electrode assembly, the housing can include a housing body and an end cover, the housing body has an opening, and after the electrode assembly is loaded into the housing body, the opening of the housing body can be closed by the end cover to form a sealed space inside the housing to accommodate the electrode assembly.

[0091] The battery apparatus referred to in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0092] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0093] In some embodiments, the battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies, the battery cell assemblies being accommodated in the box body.

[0094] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0095] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0096] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can be part of a floor of the vehicle, or portions of the box can be part of cross members and longitudinal members of the vehicle.

[0097] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0098] Hereinafter, the embodiments will mainly be described with respect to prismatic battery cells. It should be understood that the embodiments described hereinafter are also applicable to cylindrical battery cells or pouch battery cells or blade battery cells in some aspects.

[0099] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge-discharge rate, in addition to the production efficiency of the battery.

[0100] A battery cell generally includes an insulating member, a housing, and an electrode assembly contained in the housing. The housing includes a first wall, and the insulating member is disposed between the first wall and the electrode assembly to insulate and separate the first wall and the electrode assembly. The conventional method of injecting electrolyte is to inject electrolyte into the battery interior through an injection hole on the first wall and a first hole on the insulating member corresponding to the position of the injection hole. As the market demands higher energy density and longer life of the battery, the space utilization rate inside the single battery is gradually improved, and the amount of electrolyte needed to infiltrate the electrode assembly also gradually increases. Therefore, it is necessary to inject electrolyte into the battery cell at a higher speed, but because the path of the electrolyte into the battery cell interior is relatively single, the high-speed electrolyte is prone to form a turbulent flow in the first hole, causing the electrolyte to be congested locally during rapid injection, resulting in a longer injection time and reducing the production efficiency of the battery cell.

[0101] Based on the above considerations, in order to reduce the injection time of the battery cell during production and improve the production efficiency of the battery cell, the embodiments of the present application provide a battery cell, which includes a housing, an electrode assembly, and an insulating member. The housing includes a first wall, and the first wall is provided with an injection hole. The electrode assembly is contained in the housing. In the thickness direction of the first wall, the insulating member is disposed between the first wall and the electrode assembly, and the insulating member is provided with a first hole corresponding to the position of the injection hole. The insulating member and / or the first wall are provided with a flow channel, the flow channel is in communication with the injection hole, and the flow channel is configured to guide the electrolyte injected by the injection hole to the edge of the insulating member, so that the electrolyte enters the interior of the battery cell from the edge of the insulating member.

[0102] In the battery cell of the structure, the insulating member and / or the first wall is provided with a flow channel which is in communication with the liquid injection hole, so that when liquid injection is performed, part of the electrolyte injected through the liquid injection hole enters the interior of the battery cell through the first hole, and the other part enters the interior of the battery cell from the edge of the insulating member through the flow channel. Thus, compared with the case where the electrolyte injected through the liquid injection hole enters the interior of the battery cell only through the first hole, on the one hand, the electrolyte can enter the interior of the battery cell more uniformly, and the time for the electrolyte to soak the electrode assembly is reduced; on the other hand, the flow channel can distribute the electrolyte injected through the liquid injection hole, reduce the flow rate of the electrolyte at the first hole, and after the flow rate is reduced, the Reynolds number is reduced, the flow is more likely to maintain laminar flow, and the generation of turbulent flow is reduced, thereby reducing the risk of congestion of the electrolyte at the first hole during rapid injection, reducing the injection time of the electrolyte, and thus improving the production efficiency of the battery cell.

[0103] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0104] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source or a use power source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0105] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source or a use power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0106] Please refer to Figure 2 and Figure 3 , Figure 2 A structural explosion diagram of the battery device 100 is provided for some embodiments of the present application, Figure 3 A structural explosion diagram of a battery cell 20 is provided for some embodiments of the present application. The battery device 100 includes a box body 10 and the battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10.

[0107] The battery device 100 can include a box body 10 and a plurality of battery cells 20. The box body 10 is configured to accommodate the plurality of battery cells 20. The box body 10 can have various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are configured to cover each other, and the first box body 11 and the second box body 12 together define an accommodation space for accommodating the plurality of battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate structure. The first box body 11 covers the open end of the second box body 12, so that the first box body 11 and the second box body 12 together define the accommodation space. Alternatively, the first box body 11 and the second box body 12 can both be hollow structures with one end open. The open end of the first box body 11 covers the open end of the second box body 12.

[0108] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, or a square, etc. For example, in some embodiments, the box body 10 has a cuboid shape. Figure 2

[0109] In the battery device 100, the battery cells 20 arranged in the box body 10 can be one or a plurality of battery cells. When the battery cells 20 arranged in the box body 10 are a plurality of battery cells, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the plurality of battery cells 20 are accommodated in the box body 10. Alternatively, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then a plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the box body 10.

[0110] In some embodiments, the battery device 100 can further include other structures. For example, the battery device 100 can further include a current collecting component configured to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

[0111] Each of the battery cells 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can have a cuboid, a cylinder, a prism, or other shapes, etc. For example, in some embodiments, the battery cell 20 has a cuboid shape. Figure 3

[0112] Please refer to Figure 3 , and please refer to Figures 4-13 , Figure 4 , Figure 7 and Figure 10 ​​An exploded view of the structure of the first wall 211 of the battery monomer 20 and the first insulation 22 provided for some embodiments of the present application; Figure 5 , Figure 8 and Figure 11 A structure schematic view of the first wall 211 of the battery monomer 20 provided for some embodiments of the present application; Figure 6 , Figure 9 , Figure 12 and Figure 13 A cross-sectional view of the battery monomer 20 provided for some embodiments of the present application. The battery monomer 20 provided by the embodiments of the present application comprises an outer shell 21, an electrode assembly 23 and an insulation 22; the outer shell 21 comprises a first wall 211, which is provided with a liquid injection hole 211A; the electrode assembly 23 is contained in the outer shell 21; along the thickness direction X of the first wall 211, the insulation 22 is arranged between the first wall 211 and the electrode assembly 23, and the insulation 22 is provided with a first hole 22A corresponding to the position of the liquid injection hole 211A; wherein the insulation 22 and / or the first wall 211 is provided with a flow channel 201, which is in communication with the liquid injection hole 211A, and the flow channel 201 is configured to guide the electrolyte injected by the liquid injection hole 211A to the edge of the insulation 22, so that the electrolyte enters the inside of the battery monomer 20 from the edge of the insulation 22.

[0113] The outer shell 21 is a component for containing the electrode assembly 23, and the outer shell 21 can also be used to contain the electrolyte, such as electrolyte. In some embodiments, the inner part of the outer shell 21 is formed with a containing cavity for containing the electrode assembly 23.

[0114] In some embodiments, the material of the outer shell 21 can be metal or a combination of metal and non-metal, for example, the outer shell 21 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy, etc.; for example, part of the outer shell 21 can be made of metal, and the rest can be made of non-metal, for example, the first wall 211 can be made of metal, and the other parts of the outer shell 21 can be made of non-metallic material.

[0115] The outer shell 21 can be in various shapes, such as a cylinder or a prism structure, etc. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cuboid structure, a cuboid structure of the outer shell 21 can be selected.

[0116] The first wall 211 is part of the structure of the outer shell 21, and the first wall 211 can be insulatedly mounted with the first electrode terminal 24 and the second electrode terminal 24.

[0117] The first wall 211 can be made of conductive material, for example, metal material, such as aluminum, copper, iron, aluminum, steel or aluminum alloy, etc.

[0118] In some embodiments, the first wall 211 can be a cover plate of the housing 21, and a shell 21A of the housing 21 can be arranged around an edge of the first wall 211.

[0119] In some embodiments, the first wall 211 can be connected to the shell 21A by welding, bonding, clamping or other connection methods. In some embodiments, the first wall 211 and the shell 21A can be integrally formed.

[0120] The injection hole 211A is a hole structure for allowing electrolyte to enter the inside of the battery cell 20 from an injection device. The exemplary injection hole 211A can be a through-hole structure penetrating the first wall 211 in the thickness direction X of the first wall 211. In embodiments in which the housing 21 has the injection hole 211A, the battery cell 20 further includes a plugging member 211B for plugging the injection hole 211A. The injection hole 211A can be various shapes.

[0121] The electrode assembly 23 is a component in which an electrochemical reaction occurs in the battery cell 20. The structure of the electrode assembly 23 can be various, and the electrode assembly 23 can be a jelly-roll structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, for example. The separator can be a separator film, and the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, for example.

[0122] In embodiments in which the electrode assembly 23 is a jelly-roll structure, the thickness direction X of the first wall 211 can be parallel to the winding axis of the electrode assembly 23.

[0123] In some embodiments, the battery cell 20 includes a housing 21 and one or more electrode assemblies 23. The plurality of walls of the housing 21 enclose a cavity, which can be used to accommodate the electrode assembly 23. The housing 21 is determined according to the shape of the combined one or more electrode assemblies 23. The housing 21 can be a hollow cuboid or a square or a regular polyhedron, for example. The housing 21 is filled with an electrolyte, such as an electrolyte solution. The plurality of electrode assemblies 23 are arranged in a stacked manner along the second direction Z, for example.

[0124] In some embodiments, the first wall 211 is provided with an electrode terminal 24, which is a component electrically connected to the electrode assembly 23 to facilitate the export or import of current from or to the electrode assembly 23. The number of electrode terminals 24 can be two, for example, and the two electrode terminals 24 can be arranged on the first wall 211 and arranged along the first direction Y. The two electrode terminals 24 are a positive electrode terminal 24 and a negative electrode terminal 24, respectively. The positive electrode terminal 24 is used to electrically connect to the positive tab 232 of the electrode assembly 23, and the negative electrode terminal 24 is used to electrically connect to the negative tab 232 of the electrode assembly 23.

[0125] The insulation piece 22 is arranged between the electrode assembly 23 and the first wall 211, and has insulation properties to insulate and separate the first wall 211 and the electrode assembly 23.

[0126] In some embodiments, the insulation piece 22 can be in a sheet shape, a plate shape, or a ring shape, etc.

[0127] In some embodiments, the insulation piece 22 can be made of rubber, silica gel, plastic, or the like.

[0128] In some embodiments, the insulation piece 22 is made of insulation materials, such as polypropylene, polyethylene, or other materials with insulation properties.

[0129] The insulation piece 22 can be the lower plastic of the battery monomer 20.

[0130] The connection relationship between the insulation piece 22 and the first wall 211 includes, but is not limited to, injection molding, bonding, clamping, or other connection relationships through other connection members.

[0131] In some embodiments, the insulation piece 22 is provided with a relief hole 220 for avoiding the electrode terminal 24.

[0132] The thickness direction X of the first wall 211 can be parallel to the height direction of the battery monomer 20, the first direction Y can be parallel to the length direction of the battery monomer 20, and the second direction Z can be parallel to the width direction of the battery monomer 20.

[0133] The first hole 22A is a through hole structure on the insulation piece 22 for the electrolyte to pass through the insulation piece 22 and enter the battery monomer 20. For example, the injection hole 211A can be in various shapes.

[0134] The insulation piece 22 is provided with the first hole 22A corresponding to the position of the injection hole 211A, which can be understood as that the insulation piece 22 is provided with the first hole 22A, the axis of the first hole 22A is parallel to the axis of the injection hole 211A, and on the inner surface of the first wall 211, the orthographic projection of the first hole 22A should cover one end of the injection hole 211A on the inner surface of the first wall 211.

[0135] In some embodiments, the first hole 22A is coaxially arranged with the injection hole 211A, and the radial dimension of the first hole 22A is greater than that of the injection hole 211A.

[0136] The flow channel 201 is a channel for electrolyte flow.

[0137] The "insulation piece 22 and / or the first wall 211 is provided with the flow channel 201" can be understood as the flow channel 201 is provided in the insulation piece 22, or the flow channel 201 is provided in the first wall 211, or the inner surface of the first wall 211 and the surface of the insulation piece 22 facing the first wall 211 jointly enclose the flow channel 201.

[0138] The "flow channel 201 communicates with the liquid injection hole 211A" can mean that the flow channel 201 directly communicates with the liquid injection hole 211A, or that the flow channel 201 indirectly connects with the liquid injection hole 211A through other structures. Exemplarily, the flow channel 201 can indirectly connect with the liquid injection hole 211A through the first hole 22A.

[0139] The inside of the battery monomer 20 refers to the area in the shell 21 for accommodating the electrode assembly 23. Exemplarily, the insulation piece 22 is connected to the first wall 211, and the insulation piece 22 and the shell 21 define the inside of the battery monomer 20.

[0140] In some embodiments, the flow channel 201 can be multiple, which are circumferentially spaced apart along the liquid injection hole 211A. One end of the multiple flow channels 201 communicates with the liquid injection hole 211A, and the other end of the flow channel 201 is provided at the edge of the insulation piece 22. In this way, the electrolyte flows along the flow channel 201 from the liquid injection hole 211A to the edge of the insulation piece 22, and then enters the inside of the battery monomer 20 from the edge of the insulation piece 22.

[0141] In some embodiments, the flow channel 201 can communicate with the edge of the insulation piece 22 through other structures (such as through holes or slits). In this way, the electrolyte flows along the flow channel 201 from the liquid injection hole 211A to the edge of the insulation piece 22, and then enters the inside of the battery monomer 20 from the edge of the insulation piece 22.

[0142] In the present embodiment, the insulation piece 22 and / or the first wall 211 is provided with the flow channel 201, and the flow channel 201 communicates with the liquid injection hole 211A. In this way, when liquid injection is performed, part of the electrolyte injected through the liquid injection hole 211A enters the inside of the battery monomer 20 through the first hole 22A, and the other part enters the inside of the battery monomer 20 from the edge of the insulation piece 22 through the flow channel 201. Compared with the case where the electrolyte injected through the liquid injection hole 211A enters the inside of the battery monomer 20 only through the first hole 22A, on the one hand, the electrolyte can enter the inside of the battery monomer 20 more uniformly, and the time for the electrolyte to soak the electrode assembly 23 is reduced; on the other hand, the flow channel 201 can distribute the electrolyte injected through the liquid injection hole 211A, reduce the flow rate of the electrolyte at the first hole 22A, and after the flow rate is reduced, the Reynolds number is reduced, the flow is more likely to maintain laminar flow, and the generation of turbulent flow is reduced, thereby reducing the risk of congestion of the electrolyte at the first hole 22A during rapid liquid injection, reducing the injection time of the electrolyte, and thereby improving the production efficiency of the battery monomer 20.

[0143] According to some embodiments of the present application, please refer to Figures 4-13 The flow channel 201 includes a first sub-flow channel 201A and a second sub-flow channel 201B. The first sub-flow channel 201A is arranged along the edge of the first wall 211 and / or the edge of the insulation member 22. The second sub-flow channel 201B is in communication with the first sub-flow channel 201A and the liquid injection hole 211A.

[0144] The first sub-flow channel 201A is the part of the flow channel 201 in communication with the edge of the insulation member 22. The second sub-flow channel 201B is the part of the flow channel 201 in communication with the liquid injection hole 211A and the first sub-flow channel 201A. Exemplarily, the first sub-flow channel 201A and the second sub-flow channel 201B can be arranged on one of the first wall 211 and the insulation member 22; alternatively, the first sub-flow channel 201A and the second sub-flow channel 201B can be arranged on the first wall 211 and the insulation member 22 respectively; or alternatively, the first sub-flow channel 201A and the second sub-flow channel 201B can be formed by the inner surface of the first wall 211 and the side of the insulation member 22 facing the first wall 211.

[0145] In some embodiments, please refer to Figures 4-6 The first sub-flow channel 201A is arranged on the first wall 211 and extends around the edge of the first wall 211. The two ends of the first sub-flow channel 201A can be in communication or not.

[0146] In some embodiments, please refer to Figures 7-12 The first sub-flow channel 201A is arranged on the insulation member 22 and extends around the edge of the insulation member 22. The two ends of the first sub-flow channel 201A can be in communication or not.

[0147] In some embodiments, the first sub-flow channel 201A is annular with the first end connected to the second end. In the plane perpendicular to the thickness direction X, the orthographic projection of the two avoiding holes 220 is located within the orthographic projection of the region formed by the first sub-flow channel 201A. The first hole 22A is located between the two avoiding holes 220 in the first direction Y. The second sub-flow channel 201B extends in the second direction Z so that the arrangement of the second sub-flow channel 201B does not interfere with the arrangement of the avoiding holes 220.

[0148] In some embodiments, the second sub-flow channel 201B is two arranged on the opposite sides of the liquid injection hole 211A in the second direction Z.

[0149] In the embodiment, the first sub-flow channel 201A is arranged along the edge of the first wall 211 and / or the edge of the insulation member 22, so as to increase the area of the flow channel 201 which can be directly or indirectly connected with the edge of the first wall 211 and / or the edge of the insulation member 22, which is advantageous for increasing the flow rate of the flow channel 201 which can be shunted to the electrolyte injected through the injection hole 211A, so as to reduce the risk of the electrolyte being congested at the first hole 22A during the rapid injection.

[0150] According to some embodiments of the present application, please refer to Figures 4-6 The inner surface of the first wall 211 is provided with a first groove 211D and a second groove 211C, the first groove 211D is arranged along the edge of the first wall 211, and the second groove 211C is communicated with the injection hole 211A and the first groove 211D; the side of the insulation member 22 facing the first wall 211 and the first groove 211D form the first sub-flow channel 201A, and the side of the insulation member 22 facing the first wall 211 and the second groove 211C form the second sub-flow channel 201B.

[0151] The first groove 211D is an annular groove located on the inner surface of the first wall 211 and extending around the edge of the first wall 211.

[0152] The second groove 211C is a groove located on the inner surface of the first wall 211 and communicated with the injection hole 211A and the first groove 211D.

[0153] Exemplarily, the first groove 211D and the second groove 211C can be formed on the inner surface of the first wall 211 by machining such as turning, or can be formed together with the inner surface of the first wall 211 by integral molding.

[0154] In some embodiments, the end of the second groove 211C away from the first groove 211D is arranged on the hole wall of the injection hole 211A.

[0155] In some embodiments, please refer to Figure 6 The first hole 22A is coaxially arranged with the injection hole 211A, the radial dimension of the first hole 22A is greater than the radial dimension of the injection hole 211A, the end of the second groove 211C away from the first groove 211D protrudes from the inner wall of the first hole 22A to be communicated with the first hole 22A, and the end of the second groove 211C away from the first groove 211D is not arranged on the hole wall of the injection hole 211A.

[0156] In some embodiments, please refer to Figure 5The first recess 211D is an annular recess, and the first recess 211D divides the inner surface of the first wall 211 into a first region 2111 located inside the first recess 211D and a second region 2112 located outside the first recess 211D. The first region 2111 is in abutment with the insulating member 22, and the second region 2112 has a gap in the thickness direction X with the insulating member 22, so that the electrolyte entering the first recess 211D moves from the gap to the edge of the insulating member 22. Exemplarily, the first region 2111 can protrude from the second region 2112 in the thickness direction X, and / or the region on the side of the insulating member 22 facing the first wall 211 corresponding to the first region 2111 can protrude from the region on the side of the insulating member 22 facing the first wall 211 corresponding to the second region 2112 in the thickness direction X.

[0157] In the present embodiment, by providing the first recess 211D and the second recess 211C on the inner surface of the first wall 211, and by the side of the insulating member 22 facing the first wall 211 and the first recess 211D forming the first sub-flow channel 201A and by the side of the insulating member 22 facing the first wall 211 and the second recess 211C forming the second sub-flow channel 201B, only the inner surface of the first wall 211 needs to be additionally processed, thereby reducing the number of parts that need to be processed, thereby reducing the processing procedures of the battery monomer 20 and reducing the production cost of the battery monomer 20.

[0158] According to some embodiments of the present application, please refer to Figures 7-9 The side of the insulating member 22 facing the first wall 211 is provided with a third recess 22C and a fourth recess 22D. The third recess 22C is arranged along the edge of the insulating member 22, and the fourth recess 22D is communicated with the injection hole 211A and the third recess 22C. The inner surface of the first wall 211 and the third recess 22C form the first sub-flow channel 201A, and the inner surface of the first wall 211 and the fourth recess 22D form the second sub-flow channel 201B.

[0159] The third recess 22C is an annular groove located on the side of the insulating member 22 facing the first wall 211 and extending around the edge of the insulating member 22.

[0160] The fourth recess 22D is a recess located on the side of the insulating member 22 facing the first wall 211 and communicated with the injection hole 211A and the third recess 22C.

[0161] Exemplarily, the third recess 22C and the fourth recess 22D can be formed on the side of the insulating member 22 facing the first wall 211 by laser weakening or the like, or can be formed together with the side of the insulating member 22 facing the first wall 211 by integral molding.

[0162] In some embodiments, the fourth groove 22D is arranged on the hole wall of the first hole 22A away from one end of the third groove 22C.

[0163] In some embodiments, referring to Figure 5 , the third groove 22C is an annular groove, the third groove 22C divides the side of the insulating piece 22 facing the first wall 211 into a third region 2211 located inside the third groove 22C and a fourth region 2212 located outside the third groove 22C, the third region 2211 abuts against the first wall 211, and the fourth region 2212 has a gap with the inner surface of the first wall 211 in the thickness direction X, so that the electrolyte entering the third groove 22C moves from the gap to the edge of the insulating piece 22. Exemplarily, the third region 2211 can protrude from the fourth region 2212 along the thickness direction X, and / or the region on the inner surface of the first wall 211 corresponding to the third region 2211 can protrude from the region on the inner surface of the first wall 211 corresponding to the fourth region 2212 along the thickness direction X.

[0164] In the present embodiment, the third groove 22C and the fourth groove 22D are arranged on the side of the insulating piece 22 facing the first wall 211, and the first sub-flow passage 201A is formed by the inner surface of the first wall 211 and the first groove 211D, and the second sub-flow passage 201B is formed by the side of the inner surface of the first wall 211 and the second groove 211C, so that only the side of the insulating piece 22 facing the first wall 211 needs to be additionally processed, thereby reducing the number of parts that need to be processed, thereby reducing the processing procedures of the battery monomer 20 and reducing the production cost of the battery monomer 20.

[0165] According to some embodiments of the present application, referring to Figures 7-9 , the side of the insulating piece 22 away from the first wall 211 is provided with a first protrusion 223 and a second protrusion 224, the third groove 22C is positionally corresponding to the first protrusion 223, and the fourth groove 22D is positionally corresponding to the second protrusion 224.

[0166] In some embodiments, referring to Figure 9 , the insulating piece 22 comprises an insulating body 221, and the first protrusion 223 and the second protrusion 224 protrude from the side of the insulating body 221 away from the first wall 211.

[0167] “The third groove 22C is positionally corresponding to the first protrusion 223” can be understood as that the third groove 22C is arranged corresponding to the first protrusion 223, and on the inner surface of the first wall 211, the orthographic projection of the first protrusion 223 overlaps the orthographic projection of the third groove 22C, or the orthographic projection of the first protrusion 223 covers the orthographic projection of the third groove 22C.

[0168] The "fourth groove 22D corresponds to the position of the second protrusion 224" can be understood as that the fourth groove 22D is arranged correspondingly to the second protrusion 224, and the orthographic projection of the second protrusion 224 overlaps the orthographic projection of the fourth groove 22D on the inner surface of the first wall 211, or the orthographic projection of the second protrusion 224 covers the orthographic projection of the fourth groove 22D.

[0169] In the embodiment, the third groove 22C corresponds to the position of the first protrusion 223, so that the first protrusion 223 can increase the thickness of the region of the insulating member 22 where the third groove 22C is arranged, thereby reducing the risk that the region of the insulating member 22 where the third groove 22C is arranged is too thin in thickness and weak in structural strength and thus prone to breakage, thereby improving the reliability of the battery monomer 20; the fourth groove 22D corresponds to the position of the second protrusion 224, so that the second protrusion 224 can increase the thickness of the region of the insulating member 22 where the fourth groove 22D is arranged, thereby reducing the risk that the region of the insulating member 22 where the fourth groove 22D is arranged is too thin in thickness and weak in structural strength and thus prone to breakage, thereby improving the reliability of the battery monomer 20.

[0170] According to some embodiments of the present application, please refer to Figures 7-9 , and please refer to Figure 14 , Figure 14 The structure schematic diagram of the first wall 211 is provided for some embodiments of the present application. The electrode assembly 23 includes a main body 231 and a tab 232, and the tab 232 is arranged on the side of the main body 231 facing the first wall 211; wherein on the inner surface of the first wall 211, the orthographic projection of the tab 232 does not overlap the orthographic projection of the first protrusion 223, and the orthographic projection of the tab 232 does not overlap the orthographic projection of the second protrusion 224.

[0171] In order to facilitate the range of the orthographic projection of the tab 232, the orthographic projection of the first protrusion 223 and the orthographic projection of the second protrusion 224, please refer to Figure 14 , the range where the orthographic projection of the tab 232, the orthographic projection of the first protrusion 223 and the orthographic projection of the second protrusion 224 are located are marked in the figure by means of dotted lines or pattern filling, it should be noted that the dotted lines and the pattern filling are only for facilitating the display of the range of the orthographic projection of the tab 232, the orthographic projection of the first protrusion 223 and the orthographic projection of the second protrusion 224, and do not represent any entity meaning.

[0172] In the present embodiment, on the inner surface of the first wall 211, the orthogonal projection of the tab 232 does not overlap the orthogonal projection of the first protrusion 223, and the orthogonal projection of the tab 232 does not overlap the orthogonal projection of the second protrusion 224, so that the first protrusion 223 and the second protrusion 224 do not interfere with the tab 232 in the thickness direction X of the first wall 211, so that when the tab 232 is installed, it is not necessary to increase the distance between the main body 231 of the electrode assembly 23 and the inner surface of the first wall 211 in the thickness direction X in order to avoid the first protrusion 223 and the second protrusion 224, so that the case 21 can accommodate an electrode assembly 23 with a larger size in the thickness direction X without changing the size of the case 21 in the thickness direction X, thereby facilitating the improvement of the energy density of the battery cell 20.

[0173] According to some embodiments of the present application, please refer to Figures 10-12 The side of the insulating member 22 facing the first wall 211 is provided with a third protrusion 225 and a fourth protrusion 226, the first sub-flow passage 201A is located in the third protrusion 225, and the second sub-flow passage 201B is located in the fourth protrusion 226.

[0174] In some embodiments, please refer to Figure 10 The insulating member 22 includes an insulating body 221, the third protrusion 225 and the fourth protrusion 226 protrude from the side of the insulating body 221 away from the first wall 211, part of the first sub-flow passage 201A is located in the third protrusion 225, another part of the first sub-flow passage 201A is located in the insulating body 221, part of the second sub-flow passage 201B is located in the fourth protrusion 226, and another part of the second sub-flow passage 201B is located in the insulating body 221.

[0175] In some embodiments, please refer to Figure 12 The insulating member 22 includes an insulating body 221, the third protrusion 225 and the fourth protrusion 226 protrude from the side of the insulating body 221 away from the first wall 211, the first sub-flow passage 201A is located in the third protrusion 225, and the second sub-flow passage 201B is located in the fourth protrusion 226.

[0176] In some embodiments, the insulating member 22 has a connecting hole communicating the first flow passage 201 and the peripheral side of the insulating member 22.

[0177] In the present embodiment, the first sub-flow channel 201A is located in the third protrusion 225, so that the inner surfaces of the first sub-flow channel 201A are all arranged in the insulating member 22, thereby reducing the risk of foreign matters falling into the first sub-flow channel 201A and blocking the first sub-flow channel 201A during the manufacturing process of the battery monomer 20; the second sub-flow channel 201B is located in the fourth protrusion 226, so that the inner surfaces of the second sub-flow channel 201B are all arranged in the insulating member 22, thereby reducing the risk of foreign matters falling into the second sub-flow channel 201B and blocking the first sub-flow channel 201A during the manufacturing process of the battery monomer 20.

[0178] According to some embodiments of the present application, please refer to Figures 10-12 The inner surface of the first wall 211 is partially recessed to form a first accommodating groove 211E and a second accommodating groove 211F, at least part of the third protrusion 225 is accommodated in the first accommodating groove 211E, and at least part of the fourth protrusion 226 is accommodated in the second accommodating groove 211F.

[0179] The first accommodating groove 211E is a groove located on the inner surface of the first wall 211 and arranged opposite to the third protrusion 225.

[0180] The second accommodating groove 211F is a groove located on the inner surface of the first wall 211 and arranged opposite to the fourth protrusion 226.

[0181] Exemplarily, the first accommodating groove 211E and the second accommodating groove 211F can be formed on the inner surface of the first wall 211 by machining such as turning, or can be formed together with the inner surface of the first wall 211 by integral molding.

[0182] In the present embodiment, at least part of the third protrusion 225 is accommodated in the first accommodating groove 211E, and at least part of the fourth protrusion 226 is accommodated in the second accommodating groove 211F, thereby reducing the size of the first wall 211 and the insulating member 22 in the thickness direction X, so that the shell 21 can accommodate an electrode assembly 23 with a larger size in the thickness direction X, thereby facilitating the improvement of the energy density of the battery monomer 20.

[0183] According to some embodiments of the present application, please refer to Figure 14The inner surface of the first wall 211 is provided with a first groove 211D and a second groove 211C, the first groove 211D is arranged along the edge of the first wall 211, and the second groove 211C is communicated with the liquid injection hole 211A and the first groove 211D; the side of the insulation piece 22 facing the first wall 211 is provided with a third groove 22C and a fourth groove 22D, the third groove 22C is arranged along the edge of the insulation piece 22, and the fourth groove 22D is communicated with the liquid injection hole 211A and the third groove 22C; the first groove 211D and the third groove 22C jointly form a first sub-flow channel 201A, and the second groove 211C and the fourth groove 22D jointly form a second sub-flow channel 201B.

[0184] In the embodiment, the first groove 211D and the third groove 22C jointly form the first sub-flow channel 201A, so that the cross-sectional area of the first flow channel 201 can be increased relative to the case of jointly forming the first sub-flow channel 201A through only the first groove 211D or the third groove 22C, and the flow capacity of the first sub-flow channel 201A is further increased. The second groove 211C and the fourth groove 22D jointly form the second sub-flow channel 201B, so that the cross-sectional area of the second flow channel 201 can be increased relative to the case of jointly forming the second sub-flow channel 201B through only the second groove 211C or the fourth groove 22D. In summary, the shunting capacity of the flow channel 201 for the electrolyte injected through the liquid injection hole 211A is improved, so that the risk of congestion of the electrolyte at the first hole 22A during rapid injection is further reduced, the injection time of the electrolyte is reduced, and the production efficiency of the battery monomer 20 is improved.

[0185] According to some embodiments of the present application, please refer to Figure 4 、 Figure 7 and Figure 10 , and please refer to Figure 6 、 Figure 9 and Figure 12 , the insulation piece 22 includes an insulation body 221 and a fifth protruding part 222, the fifth protruding part 222 protrudes from the side of the insulation body 221 facing the electrode assembly 23 along the thickness direction X, the fifth protruding part 222 is provided with a first gas permeable hole 222A penetrating through the fifth protruding part 222 along the first direction Y, and the first direction Y is perpendicular to the thickness direction X; wherein the first gas permeable hole 222A is communicated with the flow channel 201.

[0186] The fifth protruding part 222 is a component formed on the side of the insulation body of the insulation piece 22 away from the first wall 211 and used for cooperating with the electrode assembly 23, and the fifth protruding part 222 can be integrally formed with the insulation body of the insulation piece 22, for example, the fifth protruding part 222 is formed by hot melting with the insulation body of the insulation piece 22.

[0187] The cooperation of the fifth protruding part 222 with the electrode assembly 23 means that the fifth protruding part 222 is used to abut against the main body 231 of the electrode assembly 23 along the thickness direction X.

[0188] The shape of the fifth protrusion 222 can be various, and in Figure 4 , Figure 7 and Figure 10 , the fifth protrusion 222 is cuboid. The height direction of the fifth protrusion 222 is parallel to the thickness direction X, the length direction of the fifth protrusion 222 is parallel to the second direction Z, and the width direction of the fifth protrusion 222 is parallel to the first direction Y.

[0189] The first gas passage hole 222A is through the fifth protrusion 222 along the first direction Y, that is, the extension direction of the first gas passage hole 222A is parallel to the first direction Y, and the opposite ends of the first gas passage hole 222A are located on the opposite sides of the fifth protrusion 222 in the first direction Y.

[0190] It can be understood that the first gas passage hole 222A extends along the first direction Y and penetrates the fifth protrusion 222, so that when the gas flows through the fifth protrusion 222, it can quickly pass through the fifth protrusion 222, reducing the blockage of the fifth protrusion 222 to the gas flow, facilitating the flow of the gas; when the battery monomer 20 is in thermal runaway and the pressure relief mechanism 26 is actuated, the gas can quickly flow from the gas production area to the pressure relief mechanism 26 to be discharged from the pressure relief mechanism 26, reducing the risk of the weld between the end cover 21B and the shell 21A cracking and failing, and improving the safety of the battery monomer 20.

[0191] In the present embodiment, the first gas passage hole 222A can facilitate the movement of the gas through the first gas passage hole 222A to pass through the fifth protrusion 222 to the pressure relief mechanism 26 when the battery monomer 20 is in thermal runaway and the pressure relief mechanism 26 is actuated. By connecting the first gas passage hole 222A and the flow channel 201, electrolyte can be injected into the interior of the battery monomer 20 through the first gas passage hole 222A during the liquid injection process, so that the electrolyte can more uniformly enter the interior of the battery monomer 20, reducing the time for the electrolyte to soak the electrode assembly 23 and reducing the injection time of the electrolyte, thereby improving the production efficiency of the battery monomer 20.

[0192] According to some embodiments of the present application, please refer to Figure 4 , Figure 7 and Figure 10 , and please refer to Figure 6 , Figure 9 and Figure 12 , the fifth protrusion 222 includes a first sub-protrusion 2221, a second sub-protrusion 2222 and a third sub-protrusion 2223 arranged along the first direction Y; along the first direction Y, the first sub-protrusion 2221 and the third sub-protrusion 2223 are arranged at the two ends of the insulating body 221 respectively; along the first direction Y, the first hole 22A is located between the first sub-protrusion 2221 and the second sub-protrusion 2222.

[0193] In some embodiments, the first sub-protrusion 2221 is configured to abut against the portion of the main body 231 on one side of the two tabs 232, and the third sub-protrusion 2223 is configured to abut against the portion of the main body 231 on the other side of the two tabs 232.

[0194] It can be understood that such a design makes the first sub-protrusion 2221 and the third sub-protrusion 2223 abut against the main body 231, so that a certain space is provided between the insulating body 221 and the main body 231 for arranging the tabs 232 and the adapter 25, thereby reducing the risk of internal short circuit of the battery monomer 20 caused by the abutment of the two adapters 25 against the main body 231.

[0195] In some embodiments, referring to Figure 4 , Figure 7 and Figure 10 , the first sub-protrusion 2221 and the second sub-protrusion 2222 are provided with a plurality of air chamber cavities 222B spaced apart along the second direction Z, and the first air hole 222A is in communication with at least part of the air chamber cavities 222B.

[0196] In the embodiments in which the first flow channel 201 is located on the insulating member 22, or the first flow channel 201 is jointly formed by the insulating member 22 and the first wall 211, referring to Figure 7 , the first flow channel 201 is in communication with the air chamber cavities 222B, and at least part of the portion of the first flow channel 201 located in the air chamber cavities 222B is exposed in the air chamber cavities 222B, so that the electrolyte flows into the air chamber cavities 222B from the exposed portion; or referring to Figure 10 , the portion of the first flow channel 201 extending along the second direction Z is in the form of a plurality of segments spaced apart, and an air chamber cavity 222B is arranged between any two adjacent segments of the first flow channel 201, and the first flow channel 201 is in communication with the air chamber cavities 222B.

[0197] In some embodiments, the second sub-protrusion 2222 protrudes from the side of the insulating body 221 facing the electrode assembly 23, and is located between the first sub-protrusion 2221 and the third sub-protrusion 2223 along the first direction Y. At least part of one of the two adapters 25 is located between the first sub-protrusion 2221 and the second sub-protrusion 2222, and at least part of the other of the two adapters 25 is located between the third sub-protrusion 2223 and the second sub-protrusion 2222. The second sub-protrusion 2222 is configured to abut against the portion of the main body 231 between the two tabs 232. In this way, the middle part of the insulating body 221 can be supported by the electrode assembly 23, and the two adapters 25 are isolated, and the two tabs 232 are also isolated, thereby reducing the risk of internal short circuit of the battery monomer 20 caused by the overlap of the two adapters 25.

[0198] In the present embodiment, since the first hole 22A is located between the first sub-convex part 2221 and the second sub-convex part 2222, the electrolyte injected into the interior of the battery monomer 20 through the first hole 22A is more difficult to bypass the second sub-convex part 2222 to enter between the second sub-convex part 2222 and the third sub-convex part 2223, so that the electrolyte injected into the interior of the battery monomer 20 through the first hole 22A takes more time to soak the electrode assembly 23, therefore, the flow channel 201 is in communication with the first gas permeable hole 222A of the second sub-convex part 2222, and the flow channel 201 is in communication with the first gas permeable hole 222A of the third sub-convex part 2223, which can enable the flow channel 201 to guide the electrolyte injected by the liquid injection hole 211A to between the second sub-convex part 2222 and the third sub-convex part 2223, so that the electrolyte can more evenly soak the electrode assembly 23, reducing the time for the electrolyte to soak the electrode assembly 23, thereby improving the production efficiency of the battery monomer 20.

[0199] According to some embodiments of the present application, please refer to Figure 4 , Figure 7 and Figure 10 , and please refer to Figure 6 , Figure 9 and Figure 12 , the first wall 211 is provided with a pressure relief mechanism 26, and the side of the insulating piece 22 facing the first wall 211 is recessed to form an avoidance groove 222C corresponding to the pressure relief mechanism 26; the avoidance groove 222C is arranged in the second sub-convex part 2222 and is in communication with the first gas permeable hole 222A of the second sub-convex part 2222; wherein the flow channel 201 is in communication with the avoidance groove 222C.

[0200] The pressure relief mechanism 26 refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery monomer 20 reaches a predetermined threshold. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or several of the positive plate, the negative plate, the electrolyte and the separator film in the battery monomer 20. The pressure relief mechanism 26 can take the form of a pressure relief valve, a pressure relief sheet, a gas valve, a pressure relief valve or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e. when the internal pressure or temperature of the battery monomer 20 reaches a predetermined threshold, the pressure relief mechanism 26 performs an action or a weak structure provided in the pressure relief mechanism 26 is broken, thereby forming an opening or passage for the internal pressure or temperature to be released.

[0201] The "actuation" mentioned in the present application refers to the action or activation of the pressure relief mechanism 26 to a certain state, so that the internal pressure and temperature of the battery monomer 20 can be released. The action of the pressure relief mechanism 26 can include but is not limited to: at least part of the pressure relief mechanism 26 is broken, broken, torn or opened, etc. When the pressure relief mechanism 26 is actuated, the high-temperature and high-pressure substances inside the battery monomer 20 will be discharged as exhaust from the actuated part. In this way, the battery monomer 20 can be depressurized and cooled at a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0202] The avoidance groove 222C is a region of the body of the insulating piece 22 for assembling with the pressure relief mechanism 26.

[0203] In some embodiments, the side of the insulating piece 22 facing the first wall 211 is provided with an avoidance part 222D in communication with the avoidance groove 222C. The opening of the avoidance groove 222C can partially overlap the avoidance part 222D, or the opening of the avoidance groove 222C can completely overlap the avoidance part 222D.

[0204] In the present embodiment, the flow channel 201 is in communication with the avoidance groove 222C, so that the flow channel 201 is in communication with the first gas permeable hole 222A of the second sub-protrusion 2222, which is simple in structure and easy to realize.

[0205] According to some embodiments of the present application, please refer to Figure 4 、 Figure 7 and Figure 10 , the bottom wall of the avoidance groove 222C is provided with a second gas permeable hole 222E penetrating through the bottom wall in the thickness direction X.

[0206] The second gas permeable hole 222E is a second gas permeable hole 222E penetrating through the bottom wall of the avoidance groove 222C in the thickness direction X, which means that the extension direction of the second gas permeable hole 222E is parallel to the thickness direction X, and the opposite ends of the second gas permeable hole 222E are located on the bottom wall of the avoidance groove 222C and the side of the second sub-protrusion 2222 facing the main body 231, respectively.

[0207] It can be understood that the second gas permeable hole 222E extends in the thickness direction X and penetrates through the bottom wall of the avoidance groove 222C, so that when the battery monomer 20 is in thermal runaway and the pressure relief mechanism 26 is actuated, the gas can flow quickly from the gas production area to the pressure relief mechanism 26 to be discharged from the pressure relief mechanism 26, reducing the risk of weld cracking failure of the end cover 21B and the shell 21A, and improving the safety of the battery monomer 20.

[0208] In the embodiment, when the battery monomer 20 is in thermal runaway and the pressure relief mechanism 26 is actuated, the second air vent hole 222E can facilitate the gas to enter the avoidance groove 222C through the second air vent hole 222E to move to the pressure relief mechanism 26; by connecting the flow channel 201 and the avoidance groove 222C to make the flow channel 201 communicate with the second air vent hole 222E, and then making the flow channel 201 guide the electrolyte injected through the liquid injection hole 211A to the second air vent hole 222E, so that the electrolyte can more uniformly soak the electrode assembly 23, reducing the time of soaking the electrolyte into the electrode assembly 23, thereby improving the production efficiency of the battery monomer 20.

[0209] According to some embodiments of the present application, please refer to Figure 15 , Figure 15 A structural schematic diagram of an insulating piece 22 is provided for some embodiments of the present application. The insulating piece 22 includes an insulating body 221 and a fifth protruding part 222, the fifth protruding part 222 protrudes from the side of the insulating body 221 facing the electrode assembly 23 along the thickness direction X, and the fifth protruding part 222 is provided with a first air vent hole 222A penetrating through the fifth protruding part 222 along the thickness direction X; wherein the first air vent hole 222A communicates with the flow channel 201.

[0210] In some embodiments, please refer to Figure 4 , Figure 7 and Figure 10 , a plurality of air chamber cavities 222B spaced along the second direction Z are arranged in the first sub-protruding part 2221 and the second sub-protruding part 2222, and the first air vent hole 222A penetrates through the air chamber cavity 222B along the thickness direction X away from the wall part of the first wall 211.

[0211] In the embodiment, by injecting electrolyte into the inside of the battery monomer 20 through the first air vent hole 222A during the liquid injection process, the electrolyte can more uniformly enter the inside of the battery monomer 20, and since the first air vent hole 222A penetrates through the fifth protruding part 222 along the thickness direction X, the flow path of the electrolyte is reduced, thereby reducing the injection time of the electrolyte, thereby improving the production efficiency of the battery monomer 20.

[0212] According to some embodiments of the present application, please refer to Figure 6 , Figure 9 and Figure 12 , the insulating piece 22 further includes a shielding part 22B, the shielding part 22B is arranged in the first hole 22A, and at least part of the shielding part 22B shields the first hole 22A.

[0213] The connection relationship between the shielding part 22B and the wall part of the first hole 22A includes but is not limited to injection molding, bonding, clamping or other connection relationships through other connecting members.

[0214] In some embodiments, the shielding portion 22B can be directly arranged in the first hole 22A to block part of the first hole 22A.

[0215] It can be understood that the electrolyte is buffered by the shielding portion 22B, thereby reducing the flow rate of the electrolyte, and thus reducing the risk of the separator in the electrode assembly 23 being wrinkled due to the electrolyte flowing too fast, and thus causing internal short circuit of the electrode assembly 23.

[0216] In the present embodiment, at least part of the shielding portion 22B blocks the first hole 22A, so that when the electrolyte enters the first cavity through the first hole 22A along the thickness direction X of the first wall 211, the electrolyte will contact the shielding portion 22B, thereby causing the shielding portion 22B to hinder the flow of the electrolyte, and thus reducing the flow rate of the electrolyte, thereby increasing the risk of the electrolyte being congested at the first hole 22A during rapid injection. Therefore, the flow channel 201 is arranged on the insulating member 22 and / or the first wall 211, and the flow channel 201 is in communication with the injection hole 211A, so that when injecting the electrolyte, part of the electrolyte injected through the injection hole 211A enters the inside of the battery monomer 20 through the first hole 22A, and the other part enters the inside of the battery monomer 20 through the edge of the insulating member 22 through the flow channel 201, thereby distributing the electrolyte injected through the injection hole 211A through the flow channel 201, reducing the risk of the electrolyte being congested at the first hole 22A during rapid injection, reducing the injection time of the electrolyte, and thus improving the production efficiency of the battery monomer 20.

[0217] According to some embodiments of the present application, please refer to Figure 3 The shell 21 includes a housing 21A and an end cover 21B, the housing 21A has an opening, and the end cover 21B covers the opening, and the first wall 211 is the end cover 21B.

[0218] The housing 21A is a component for accommodating the electrode assembly 23.

[0219] The cover plate is a component that covers the opening of the housing 21A to isolate the internal environment of the battery monomer 20 from the external environment.

[0220] It can be understood that the shape of the cover plate can be adapted to the shape of the housing 21A, for example, the housing 21A is a rectangular plate structure adapted to the rectangular plate structure of the housing 21A. The material of the cover plate can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate can be the same as or different from the material of the housing 21A.

[0221] In the present embodiment, the opening is designed to facilitate the accommodation of the electrode assembly 23 in the housing 21A through the opening, and the end cover 21B covers the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly 23, and thus improving the reliability of the battery monomer 20.

[0222] Among them, reference Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0223] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0224] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0225] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, see [reference]. Figure 2 Box 10 has a rectangular structure.

[0226] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, see [reference]. Figure 2 The battery device 100 has multiple battery cells 20 installed inside its housing 10. These battery cells 20 can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in series and others in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed inside the housing 10.

[0227] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0228] It is to be noted that in some embodiments, the battery device 100 can also not be provided with the case 10, the battery device 100 includes the plurality of battery cells 20, and the battery device 100 composed of the plurality of battery cells 20 can be directly assembled to the electric device to provide electric energy for the electric device by the plurality of battery cells 20. That is, the case 10 can be part of the electric device. Taking the vehicle 1000 as an example of the electric device, the case 10 can be part of the chassis structure of the vehicle 1000, for example, part of the case 10 can be at least part of the floor of the vehicle 1000, or part of the case 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0229] According to some embodiments of the present application, some embodiments of the present application also provide an electric device, the electric device includes the battery cell 20 provided above, and the battery cell 20 is used to provide electric energy.

[0230] According to some embodiments of the present application, please refer to Figures 3-15The battery cell 20 comprises a shell 21, an electrode assembly 23 and an insulating member 22. The shell 21 comprises a first wall 211 provided with a liquid injection hole 211A. The electrode assembly 23 is accommodated in the shell 21. The insulating member 22 is arranged between the first wall 211 and the electrode assembly 23 along a thickness direction X of the first wall 211, and the insulating member 22 is provided with a first hole 22A corresponding to the position of the liquid injection hole 211A. The insulating member 22 and / or the first wall 211 is provided with a flow channel 201 communicating with the liquid injection hole 211A, and the flow channel 201 is configured to guide the electrolyte injected through the liquid injection hole 211A to the edge of the insulating member 22, so that the electrolyte enters the inside of the battery cell 20 from the edge of the insulating member 22. The flow channel 201 comprises a first sub-flow channel 201A arranged along the edge of the first wall 211 and / or the edge of the insulating member 22, and a second sub-flow channel 201B communicating the first sub-flow channel 201A and the liquid injection hole 211A. The insulating member 22 comprises an insulating body 221 and a fifth protrusion 222 protruding from the side of the insulating body 221 facing the electrode assembly 23 along the thickness direction X, and the fifth protrusion 222 is provided with a first gas permeable hole 222A penetrating the fifth protrusion 222 along a first direction Y perpendicular to the thickness direction X. The first gas permeable hole 222A communicates with the flow channel 201. The fifth protrusion 222 comprises a first sub-protrusion 2221, a second sub-protrusion 2222 and a third sub-protrusion 2223 arranged at intervals along the first direction Y. The first sub-protrusion 2221 and the third sub-protrusion 2223 are arranged at two ends of the insulating body 221 along the first direction Y respectively. The first hole 22A is located between the first sub-protrusion 2221 and the second sub-protrusion 2222 along the first direction Y. The first wall 211 is provided with a pressure relief mechanism 26, and the side of the insulating member 22 facing the first wall 211 is recessed to form an avoidance groove 222C corresponding to the pressure relief mechanism 26. The avoidance groove 222C is arranged in the second sub-protrusion 2222 and communicates with the first gas permeable hole 222A of the second sub-protrusion 2222. The flow channel 201 communicates with the avoidance groove 222C. The bottom wall of the avoidance groove 222C is provided with a second gas permeable hole 222E penetrating the bottom wall along the thickness direction X. The insulating member 22 further comprises a shielding portion 22B arranged in the first hole 22A, and at least part of the shielding portion 22B shields the first hole 22A. The shell 21 comprises a shell body 21A having an opening and an end cover 21B covering the opening, and the first wall 211 is the end cover 21B.

[0231] In some embodiments, the inner surface of the first wall 211 is provided with a first groove 211D and a second groove 211C, the first groove 211D is arranged along the edge of the first wall 211, and the second groove 211C is in communication with the liquid injection hole 211A and the first groove 211D; the side of the insulation piece 22 facing the first wall 211 encloses the first groove 211D to form a first sub-flow channel 201A, and the side of the insulation piece 22 facing the first wall 211 encloses the second groove 211C to form a second sub-flow channel 201B.

[0232] In some embodiments, the side of the insulation piece 22 facing the first wall 211 is provided with a third groove 22C and a fourth groove 22D, the third groove 22C is arranged along the edge of the insulation piece 22, and the fourth groove 22D is in communication with the liquid injection hole 211A and the third groove 22C; the inner surface of the first wall 211 encloses the third groove 22C to form the first sub-flow channel 201A, and the inner surface of the first wall 211 encloses the fourth groove 22D to form the second sub-flow channel 201B. The side of the insulation piece 22 away from the first wall 211 is provided with a first protrusion 223 and a second protrusion 224, the third groove 22C is in position correspondence with the first protrusion 223, and the fourth groove 22D is in position correspondence with the second protrusion 224. The electrode assembly 23 includes a main body 231 and a tab 232, and the tab 232 is arranged on the side of the main body 231 facing the first wall 211; wherein on the inner surface of the first wall 211, the orthogonal projection of the tab 232 does not overlap with the orthogonal projection of the first protrusion 223, and the orthogonal projection of the tab 232 does not overlap with the orthogonal projection of the second protrusion 224.

[0233] In some embodiments, the side of the insulation piece 22 facing the first wall 211 is provided with a third protrusion 225 and a fourth protrusion 226, the first sub-flow channel 201A is located in the third protrusion 225, and the second sub-flow channel 201B is located in the fourth protrusion 226. The inner surface of the first wall 211 is partially recessed to form a first accommodating groove 211E and a second accommodating groove 211F, at least part of the third protrusion 225 is accommodated in the first accommodating groove 211E, and at least part of the fourth protrusion 226 is accommodated in the second accommodating groove 211F.

[0234] In some embodiments, the inner surface of the first wall 211 is provided with a first groove 211D and a second groove 211C, the first groove 211D is arranged along the edge of the first wall 211, and the second groove 211C is in communication with the liquid injection hole 211A and the first groove 211D; the side of the insulation piece 22 facing the first wall 211 is provided with a third groove 22C and a fourth groove 22D, the third groove 22C is arranged along the edge of the insulation piece 22, and the fourth groove 22D is in communication with the liquid injection hole 211A and the third groove 22C; the first groove 211D and the third groove 22C enclose the first sub-flow channel 201A, and the second groove 211C and the fourth groove 22D enclose the second sub-flow channel 201B.

[0235] In some embodiments, according to some embodiments of the present application, reference can be made to Figure 15 , Figure 15 A structural schematic diagram of an insulating piece 22 is provided for some embodiments of the present application. The insulating piece 22 includes an insulating body 221 and a fifth protruding portion 222 protruding from the side of the insulating body 221 facing the electrode assembly 23 in the thickness direction X, and the fifth protruding portion 222 is provided with a first air permeable hole 222A penetrating through the fifth protruding portion 222 in the thickness direction X; wherein the first air permeable hole 222A is in communication with the flow channel 201.

[0236] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0237] The above embodiments are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, the first wall being provided with a liquid injection hole; Electrode assembly, housed within the housing; An insulating component is disposed between the first wall and the electrode assembly along the thickness direction of the first wall, and the insulating component has a first hole corresponding to the position of the liquid injection hole; The insulating member and / or the first wall are provided with a flow channel, which communicates with the injection hole. The flow channel is configured to guide the electrolyte injected by the injection hole toward the edge of the insulating member, so that the electrolyte enters the battery cell from the edge of the insulating member.

2. The battery cell as described in claim 1, characterized in that, The flow channel includes a first sub-flow channel and a second sub-flow channel. The first sub-flow channel is disposed along the edge of the first wall and / or the edge of the insulating member. The second sub-flow channel connects the first sub-flow channel and the injection hole.

3. The battery cell as described in claim 2, characterized in that, The inner surface of the first wall is provided with a first groove and a second groove. The first groove is provided along the edge of the first wall, and the second groove connects the injection hole and the first groove. The side of the insulating member facing the first wall and the first groove together form the first sub-channel, and the side of the insulating member facing the first wall and the second groove together form the second sub-channel.

4. The battery cell as described in claim 2, characterized in that, The insulating component has a third groove and a fourth groove on the side facing the first wall. The third groove is provided along the edge of the insulating component, and the fourth groove connects the injection hole and the third groove. The inner surface of the first wall and the third groove together form the first sub-channel, and the inner surface of the first wall and the fourth groove together form the second sub-channel.

5. The battery cell as described in claim 4, characterized in that, The insulating component has a first protrusion and a second protrusion on the side opposite to the first wall, the third groove corresponds to the position of the first protrusion, and the fourth groove corresponds to the position of the second protrusion.

6. The battery cell as described in claim 5, characterized in that, The electrode assembly includes a body and a tab, the tab being disposed on the side of the body facing the first wall; Wherein, on the inner surface of the first wall, the orthographic projection of the electrode tab does not overlap with the orthographic projection of the first protrusion, and the orthographic projection of the electrode tab does not overlap with the orthographic projection of the second protrusion.

7. The battery cell as described in claim 2, characterized in that, The insulating member has a third protrusion and a fourth protrusion on the side facing the first wall, the first sub-channel is located in the third protrusion, and the second sub-channel is located in the fourth protrusion.

8. The battery cell as described in claim 7, characterized in that, The inner surface of the first wall is partially recessed to form a first receiving groove and a second receiving groove, at least a portion of the third protrusion is received in the first receiving groove, and at least a portion of the fourth protrusion is received in the second receiving groove.

9. The battery cell as described in claim 2, characterized in that, The inner surface of the first wall is provided with a first groove and a second groove. The first groove is provided along the edge of the first wall, and the second groove connects the injection hole and the first groove. The insulating component has a third groove and a fourth groove on the side facing the first wall. The third groove is provided along the edge of the insulating component, and the fourth groove connects the injection hole and the third groove. The first groove and the third groove together form the first sub-channel, and the second groove and the fourth groove together form the second sub-channel.

10. The battery cell as described in claim 1, characterized in that, The insulating component includes: An insulating body and a fifth protrusion, the fifth protrusion protruding from the side of the insulating body facing the electrode assembly along the thickness direction, the fifth protrusion being provided with a first vent hole penetrating the fifth protrusion along a first direction perpendicular to the thickness direction; The first vent hole is connected to the flow channel.

11. The battery cell as described in claim 10, characterized in that, The fifth protrusion includes a first sub-protrusion, a second sub-protrusion, and a third sub-protrusion that are spaced apart along the first direction; Along the first direction, the first sub-protrusion and the third sub-protrusion are respectively disposed at both ends of the insulating body; Along the first direction, the first hole is located between the first sub-protrusion and the second sub-protrusion.

12. The battery cell as described in claim 11, characterized in that, The first wall is provided with a pressure relief mechanism, and the side of the insulating member facing the first wall is recessed to form a relief groove corresponding to the pressure relief mechanism; The clearance groove is provided on the second sub-protrusion and communicates with the first vent hole of the second sub-protrusion; The flow channel is connected to the clearance groove.

13. The battery cell as described in claim 12, characterized in that, The bottom wall of the clearance groove is provided with a second vent hole that penetrates the bottom wall along the thickness direction.

14. The battery cell as described in claim 1, characterized in that, The insulating component includes: An insulating body and a fifth protrusion, wherein the fifth protrusion protrudes from the side of the insulating body facing the electrode assembly along the thickness direction, and the fifth protrusion is provided with a first vent hole penetrating the fifth protrusion along the thickness direction; The first vent hole is connected to the flow channel.

15. The battery cell as described in claim 1, characterized in that, The insulating component further includes: A blocking portion is disposed within the first hole, and the blocking portion at least partially blocks the first hole.

16. The battery cell according to any one of claims 1-15, characterized in that, The housing includes a shell and an end cap, the shell having an opening, the end cap covering the opening, and the first wall being the end cap.

17. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-16.

18. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-16, the battery cell being used to provide electrical energy.

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