Battery device, electric device, and method for manufacturing battery device

Abstract

The invention provides a battery device, a power utilization device and a manufacturing method of the battery device. The battery device comprises a box body which is provided with a bearing surface, and colloid is arranged on the bearing surface; the plurality of single batteries are arranged in the box body, and the single batteries are adhered to the bearing surface through colloid; the glue guide piece is arranged in a gap between the adjacent battery monomers, and the glue guide piece is adhered to the bearing surface through glue; wherein one end, close to the bearing surface, of the glue guide piece is provided with a first glue inlet, the glue guide piece comprises a plurality of first side surfaces respectively facing a plurality of adjacent battery monomers, each first side surface is provided with a first glue overflow opening, and each first side surface is bonded with the corresponding battery monomer through glue; a first glue guiding cavity communicating with the first glue inlet and the first glue overflowing opening is formed in the glue guiding piece, the first glue guiding cavity extends in the first direction, and the first direction is parallel to the gravity direction. The reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device, an electrical device, and a method for manufacturing the battery device. Background Art

[0002] With the rapid development of new energy technologies, battery devices have been widely used in electronic equipment, electric vehicles, electric two-wheeled vehicles, power tools, etc. As the application of battery devices becomes more and more extensive, higher requirements are placed on the reliability of battery devices. Summary of the invention

[0003] The embodiments of the present application provide a battery device, an electrical device, and a method for manufacturing the battery device to improve the reliability of the battery device.

[0004] In a first aspect, an embodiment of the present application provides a battery device, comprising: a box body having a bearing surface, on which a colloid is arranged; a plurality of battery cells arranged in the box body, and the battery cells are bonded to the bearing surface through the colloid; a glue guide member arranged in the gaps between the adjacent plurality of battery cells, and the glue guide member is bonded to the bearing surface through the colloid; wherein a first glue inlet is arranged at one end of the glue guide member close to the bearing surface, the glue guide member comprises a plurality of first side surfaces respectively facing the adjacent plurality of battery cells, a first glue overflow port is arranged on the first side surface, and each of the first side surfaces is bonded to the corresponding battery cell through the colloid; a first glue guide cavity is formed inside the glue guide member, which connects the first glue inlet and the first glue overflow port, and the first glue guide cavity extends along a first direction, and the first direction is parallel to the direction of gravity.

[0005] The glue guide member guides the glue on the bearing surface from the first glue inlet into the first glue guide cavity, the glue in the first glue guide cavity flows from bottom to top to the first glue overflow port, and the glue overflowing from the first glue overflow port flows from top to bottom between the glue guide member and each battery cell, so that the multiple battery cells are firmly bonded together with the glue guide member through the glue from the bearing surface, and the multiple battery cells and the glue guide member are all bonded to the bearing surface through the glue, thereby improving the overall strength of the battery device, and when the battery device is subjected to vibration impact, the risk of shaking between the multiple battery cells can be greatly reduced, thereby improving reliability.

[0006] In some embodiments, along the first direction, the size of the battery cell is H1, the distance between the first glue overflow port and the carrying surface is H2, satisfying H1 / 2≤H2≤H1, and the first direction is perpendicular to the carrying surface.

[0007] The colloid overflowing from the first glue overflow port can flow from the higher position of the battery cell to the bottom between the first side surface and the corresponding battery cell, so that the colloid can more fully fill the gap between the glue guide and the battery cell, thereby improving the stability between the multiple battery cells and the glue guide; in addition, the colloid overflowing from the first glue overflow port can also be blocked by the battery cell, reducing the risk of colloid outflow and improving the bonding effect.

[0008] In some embodiments, the first glue guiding cavity extends along a first direction, the first glue overflow port is a first channel, one end of the first channel extends to the inner wall of the first glue guiding cavity, and the other end extends to the first side surface, and the first direction is perpendicular to the bearing surface.

[0009] By using the first glue overflow opening as the first channel, the overflowed glue can be better guided to between the first side surface and the corresponding battery cell, thereby improving the bonding effect.

[0010] In some embodiments, a plurality of the first glue overflow openings are disposed on each of the first side surfaces, and the plurality of the first glue overflow openings are spaced apart along a first direction, and the first direction is perpendicular to the bearing surface.

[0011] The plurality of first glue overflow openings are arranged at intervals along the first direction, so that the overflowed glue flows to different positions between the first side surface and the corresponding battery cell, and the bonding is more uniform and reliable.

[0012] In some embodiments, the first glue guiding cavity is a cylindrical cavity.

[0013] The cylindrical cavity helps to minimize the glue feeding path, allowing more glue on the bearing surface to quickly overflow through the first glue overflow port, reducing unnecessary glue retention in the first glue guide cavity, thereby improving the bonding effect; in addition, the cylindrical cavity is easy to process and improves manufacturing efficiency.

[0014] In some embodiments, the glue guiding member includes a bottom surface facing the bearing surface, and the first glue inlet is arranged on the bottom surface.

[0015] By arranging the first glue inlet on the bottom surface, the colloid can enter the first glue guiding cavity more easily, so that the colloid can overflow from the first glue overflow outlet efficiently.

[0016] In some embodiments, the first glue inlet is a first groove, and one end of the first glue guiding cavity passes through the bottom wall of the first groove; wherein the first groove is filled with the colloid.

[0017] When the glue guide is inserted into the gap between adjacent multiple battery cells and squeezes the colloid on the supporting surface, the first groove plays the role of gathering glue, gathering more colloid on the supporting surface into the first groove, so that the colloid is sufficient to reach the required amount to enter the first glue guide cavity and overflow through the first glue overflow port, thereby improving the bonding effect.

[0018] In some embodiments, a second glue inlet is further provided on the bottom surface, a second glue overflow port is further provided on the first side surface, and a second glue guiding cavity connecting the second glue inlet and the second glue overflow port is formed inside the glue guiding component; wherein, along the first direction, the second glue overflow port is closer to the bottom surface than the first glue overflow port, and the first direction is perpendicular to the bearing surface.

[0019] Thus, the bonding effect between the first side surface and the corresponding battery cell near the bottom surface can be improved, and the first glue overflow opening can ensure reliable bonding between the first side surface and the corresponding glue guide member along most of the first direction.

[0020] In some embodiments, the second glue inlet is arranged around the first glue inlet, and the second glue guiding cavity is arranged around the first glue guiding cavity.

[0021] Thus, the second glue inlet and the first glue inlet are two independent glue inlets, and the second glue guiding cavity and the first glue guiding cavity are two independent cavities, so that glue feeding, glue guiding and glue overflow can be carried out simultaneously without affecting each other, thereby improving the bonding reliability.

[0022] In some embodiments, the plurality of battery cells include at least four battery cells arranged in two rows and two columns, each row of battery cells is arranged along a second direction, and each column of battery cells is arranged along a third direction, the second direction and the third direction are perpendicular to each other and parallel to the bearing surface; each battery cell includes a second side surface perpendicular to the second direction, a third side surface perpendicular to the third direction, and a transition surface connecting the second side surface and the third side surface; the glue guide is disposed in the gap between the four battery cells, the glue guide includes four first side surfaces, and the four first side surfaces are respectively opposite to the transition surfaces of the four battery cells, and each first side surface is bonded to the relative transition surface by the glue.

[0023] Due to the existence of the transition surface, there is a gap between the four battery cells. The adhesive conductive member is arranged in the gap between the four battery cells, utilizing the gap without occupying additional space. The four battery cells are reliably bonded together without reducing the volume energy density of the battery device.

[0024] In some embodiments, a shape of the first side surface is adapted to a shape of the transition surface.

[0025] This helps to evenly fill the colloid between the first side surface and the transition surface, thereby improving the bonding effect.

[0026] In some embodiments, the transition surface is a first arc surface; and the first side surface is a second arc surface.

[0027] The first side surface is a second arc surface, which helps to increase the bonding area with the colloid, thereby improving the bonding effect.

[0028] In some embodiments, the arc radius of the second arc surface is smaller than the arc radius of the first arc surface, so that a gap for filling the colloid is formed between the first side surface and the transition surface.

[0029] This helps to increase the amount of colloid filled between the first side surface and the transition surface, thereby improving the bonding effect.

[0030] In some embodiments, a protrusion is formed on the second arc surface, and the protrusion abuts against the first arc surface, so that a gap for filling the colloid is formed between the first side surface and the transition surface.

[0031] By forming a protrusion on the second arc surface (first side surface), a gap for filling the colloid is formed between the first side surface and the transition surface, which helps to increase the amount of colloid filled between the first side surface and the transition surface, and also helps the colloid to remain in the gap between the first side surface and the transition surface, thereby improving the bonding effect.

[0032] In some embodiments, the material of the rubber guiding member is fiber reinforced resin.

[0033] The material of the rubber conductive part is fiber-reinforced resin, which can not only meet the strength requirements but also help reduce weight, making the battery device lightweight.

[0034] In a second aspect, an embodiment of the present application further provides an electrical device, comprising: a battery device as described in any of the above embodiments.

[0035] In a third aspect, an embodiment of the present application also provides a method for manufacturing a battery device, comprising: coating a colloid on a bearing surface of a box; placing a plurality of battery cells on the bearing surface; inserting a glue guide into the gaps between the plurality of battery cells, and squeezing the colloid so that the colloid enters a first glue guiding cavity inside the glue guide from a first glue inlet of the glue guide, and flows out from a first glue overflow port connected to the first glue guiding cavity to fill the gap between the glue guide and each battery cell; wherein the first glue guiding cavity extends along a first direction, and the first direction is parallel to the direction of gravity.

[0036] The glue on the bearing surface is squeezed by the glue guiding member, so that the glue enters the first glue guiding cavity through the first glue inlet, and the glue in the first glue guiding cavity flows from bottom to top to the first glue overflow port, and the glue overflowing through the first glue overflow port flows out from top to bottom to between the glue guiding member and the battery cell, so that multiple battery cells are firmly bonded together through the glue from the bearing surface and the glue guiding member, and multiple battery cells are bonded together to the box body, thereby, when the battery device is subjected to vibration impact, the risk of shaking between multiple battery cells can be greatly reduced, thereby improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application; Figure 2 An exploded view of a box provided in some embodiments of the present application; Figure 3 An exploded view of a battery cell provided for some embodiments of the present application; Figure 4 A schematic diagram of the arrangement of a plurality of adjacent battery cells provided in some embodiments of the present application; Figure 5 An exploded view of a plurality of adjacent battery cells and a rubber conductive member provided in some embodiments of the present application; Figure 6 A schematic diagram of the structure of the adhesive guide member provided in some embodiments of the present application; Figure 7 A schematic diagram of another viewing angle of a glue guide member provided in some embodiments of the present application; Figure 8 for Figure 7 Sectional view of the middle DD position; Fig. 9 A top view of a plurality of adjacent battery cells and adhesive conductive parts bonded together according to some embodiments of the present application; Fig.10 for Fig. 9 Sectional view at the middle AA position; Fig.11 A schematic diagram from another perspective of bonding a plurality of adjacent battery cells and adhesive conductive members provided in some embodiments of the present application; Fig.12 for Fig.11 A magnified schematic diagram of position B in the middle; Fig.13 A top view of a plurality of adjacent battery cells and adhesive conductive parts bonded together provided in some other embodiments of the present application; Fig.14 for Fig.13 Enlarged schematic diagram of the middle C position; Fig.15 A schematic diagram of the structure of a glue guide member provided in some other embodiments of the present application; Fig.16 A schematic diagram of a glue guide member from another perspective provided in some other embodiments of the present application; Fig.17 for Fig.16 The middle part is an enlarged schematic diagram; Fig.18 A flowchart of a method for manufacturing a battery device provided in some embodiments of the present application.

[0039] icon: 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-box body; 11-first box body; 12-second box body; 101-bearing surface; 20-battery cell; 20A-gap; 21-housing; 22-electrode assembly; 23-electrode terminal; 201-second side surface; 202-third side surface; 203-transition surface; 204-bottom surface; 211-housing; 212-end cover; 221-main body; 222-ear; 30-glue guide; 31-first glue inlet; 31a-bottom wall of groove; 32-first glue overflow outlet; 33-first glue guide cavity; 34-second glue inlet; 35-second glue overflow outlet; 36-second glue guide cavity; 37-protrusion; 301-first side surface; 302-inner wall; 303-bottom surface; 40-Buffer. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in this application and in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0042] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0046] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0047] The battery cell can be 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0048] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting to a certain extent, while allowing active ions to pass through.

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

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

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

[0052] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0053] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0054] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

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

[0056] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0057] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0058] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0059] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0060] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0061] In some embodiments, the separator is a separator membrane. There can be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability can be selected.

[0062] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0063] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0064] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0065] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0066] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane sulfone, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0067] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0068] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0069] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0070] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0071] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0072] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0073] In some embodiments, the electrode assembly is a laminated structure.

[0074] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0075] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0076] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0077] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0078] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0079] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0080] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0081] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0082] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0083] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0084] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0085] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0086] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0087] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0088] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are buckled together to form a closed space inside the box body to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0089] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0090] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0091] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0092] Battery devices have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, the reliability of the battery device must also be considered.

[0093] With the rapid development of new energy technologies, higher requirements are placed on the reliability of battery devices. At present, in order to improve the utilization rate of the internal space of the battery device, the crossbeams and longitudinal beams inside the box are removed, resulting in weaker overall rigidity of the box and making it more susceptible to vibration shock. If the battery cells are not firmly fixed, there will be a situation where the vibration frequency of the box and the battery cells is inconsistent, and there is a risk of collision between the battery cells and leakage.

[0094] In the related art, multiple battery cells are fixed as a whole by applying glue on the shoulders (the part of the top cover close to the edge) of multiple battery cells and bonding them to the shoulders of each battery cell through a pressure strip, thereby reducing the risk of collision between battery cells. However, due to the limitations of the glue coating process and the influence of the inconsistent height of the shoulders of multiple battery cells, it is difficult to reliably fix multiple battery cells together by the pressure strip method. When subjected to vibration and impact, there is also a risk of collision between battery cells and leakage, resulting in poor reliability.

[0095] In this regard, an embodiment of the present application provides a battery device, including: a box body, having a bearing surface, on which a colloid is arranged; a plurality of battery cells are arranged in the box body, and the battery cells are bonded to the bearing surface through the colloid; a glue guide member is arranged in the gap between the adjacent plurality of battery cells, and the glue guide member is bonded to the bearing surface through the colloid; wherein a first glue inlet is arranged at one end of the glue guide member close to the bearing surface, the glue guide member includes a plurality of first side surfaces respectively facing the adjacent plurality of battery cells, a first glue overflow port is arranged on the first side surface, and each first side surface is bonded to the corresponding battery cell through the colloid; a first glue guide cavity is formed inside the glue guide member, which connects the first glue inlet and the first glue overflow port, and the first glue guide cavity extends along a first direction, and the first direction is parallel to the direction of gravity.

[0096] The glue guiding member guides the glue on the bearing surface into the first glue guiding cavity through the first glue inlet, and the glue in the first glue guiding cavity flows from bottom to top toward the first glue overflow port, and the glue overflowing through the first glue overflow port flows from top to bottom between the glue guiding member and each battery cell, so that the multiple battery cells are firmly bonded together with the glue guiding member through the glue from the bearing surface, and the multiple battery cells and the glue guiding member are bonded to the box body through the glue, thereby, when the battery device is subjected to vibration impact, the risk of shaking between the multiple battery cells can be greatly reduced, thereby improving reliability.

[0097] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. A power supply system of the electrical device can be composed of the battery device disclosed in the present application to improve the reliability of the battery device.

[0098] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0099] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0100] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided 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 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0101] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source or a usage power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0102] Please refer to Figure 2 and Figure 3 , wherein the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and 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 jointly define an assembly space; the first box body 11 and the second box body 12 may 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.

[0103] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0104] In the battery device 100, a plurality of battery cells 20 are arranged in the box 10, and 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 both 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 whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then the whole is accommodated in the box 10.

[0105] In some embodiments, the battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0106] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. For example, Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0107] As an example, see Figure 3 The battery cell 20 includes a housing 21 and an electrode assembly 22 disposed in the housing 21 .

[0108] The housing 21 can also be used to contain electrolytes, such as electrolytes. The housing 21 can be in various structural forms, such as a cylinder or a cuboid, etc. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0109] Optionally, the outer shell 21 may include a shell 211 and an end cover 212, wherein a accommodating cavity is formed inside the shell 211, and the accommodating cavity is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening, that is, the shell 211 is a hollow structure with an opening formed at one end, and the end cover 212 covers the opening of the shell 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0110] The shell 211 can be in various shapes, such as a cylinder, a cuboid, or a prism structure. The shape of the shell 211 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a shell 211 with a cylindrical structure can be selected; if the electrode assembly 22 is a cuboid structure, a shell 211 with a cuboid structure can be selected. Of course, the structure of the end cap 212 can also be various, for example, the end cap 212 is a plate-like structure or a hollow structure with one end open. For example, in Figure 3In the embodiment, the housing 211 is a rectangular parallelepiped structure.

[0111] Of course, it is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 may include a shell body 211 and two end caps 212. The shell body 211 is a hollow structure with openings formed on two opposite sides. One end cap 212 corresponds to an opening of the shell body 211 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the shell body 211 is formed with openings on two opposite sides, and the two end caps 212 are respectively covered on two sides of the shell body 211 to close the corresponding openings.

[0112] It should be noted that the electrode assembly 22 is the component where electrochemical reactions occur in the battery cell 20, and the structure of the electrode assembly 22 can be of various types. For example, the electrode assembly 22 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or it can be a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.

[0113] Exemplarily, the isolation member is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0114] The electrode assembly 22 includes a main body 221 and a tab 222. The main body 221 is a main component of the electrode assembly 22 for electrochemical reaction in the battery cell 20. Figure 3 In the embodiment, the tab 222 is connected to one end of the main body 221 close to the end cap 212, so that the tab 222 is connected to the electrode terminal 23. The tab 222 can be directly connected to the electrode terminal 23, or can be connected through a transition component.

[0115] Optionally, the number of electrode assemblies 22 contained in the housing 21 may be one or more. Figure 3 In the embodiment, the outer shell 21 of the battery cell 20 is provided with a plurality of electrode assemblies 22, and the plurality of electrode assemblies 22 are stacked. When a plurality of electrode assemblies 22 are provided in the outer shell 21 of the battery cell 20, the number of the electrode assemblies 22 may be two, three, four, five or six, etc.

[0116] The electrode terminal 23 serves to electrically connect the electrode assembly 22 to serve as an output terminal or an input terminal of the battery cell 20 , thereby being able to output or input electrical energy of the battery cell 20 .

[0117] Exemplarily, the electrode terminal 23 may be made of a variety of materials. For example, the electrode terminal 23 may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0118] Among them, Figure 3 In the figure, the battery cell 20 includes two electrode terminals 23, and correspondingly, each electrode assembly 22 has two pole ears 222, and the polarities of the two pole ears 222 are opposite, that is, the two pole ears 222 are respectively the positive electrode and negative electrode of the input or output electrode assembly 22, and the two electrode terminals 23 are respectively electrically connected to the two pole ears 222 of the electrode assembly 22 to realize the input or output of the positive and negative electrodes of the battery cell 20.

[0119] The electrode terminal 23 may be mounted on the housing 21 in various structures. Figure 3 In the embodiment, the two electrode terminals 23 are mounted on the end cap 212. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, the two electrode terminals 23 may be mounted on the shell 211 of the shell 21. Similarly, one electrode terminal 23 may be mounted on the shell 211 of the shell 21, and the other electrode terminal 23 may be mounted on the end cap 212 of the shell 21.

[0120] Below, refer to Figures 2 to 17 , the embodiments of the present application are described in detail.

[0121] The embodiment of the present application provides a battery device 100, comprising: a box body 10, having a bearing surface 101, on which a colloid is arranged; a plurality of battery cells 20, arranged in the box body 10, and the battery cells 20 are bonded to the bearing surface 101 through the colloid; a glue guide 30, arranged in a gap 20A between the plurality of adjacent battery cells 20, and the glue guide 30 is bonded to the bearing surface 101 through the colloid; wherein a first glue inlet 31 is arranged at one end of the glue guide 30 close to the bearing surface 101, the glue guide 30 comprises a plurality of first side surfaces 301 facing the plurality of adjacent battery cells 20 respectively, a first glue overflow port 32 is arranged on the first side surface 301, and each first side surface 301 is bonded to the corresponding battery cell 20 through the colloid; a first glue guide cavity 33 is formed inside the glue guide 30 to communicate with the first glue inlet 31 and the first glue overflow port 32, and the first glue guide cavity 33 extends along a first direction Z, and the first direction Z is parallel to the gravity direction.

[0122] The bearing surface 101 of the box body 10 is used to support and fix multiple battery cells 20. The multiple battery cells 20 are bonded to the bearing surface 101 by colloid. As an example, the colloid (such as structural adhesive) can be first coated on the bearing surface 101, and then the multiple battery cells 20 can be fixed to the bearing surface 101 coated with the colloid, and gaps 20A are formed between the adjacent multiple battery cells 20.

[0123] Reference Figure 2, each battery cell 20 is attached to the bearing surface 101 along the first direction Z away from the bottom surface of the end cover 212, that is, the battery cell 20 is "upright". The bearing surface 101 of the box body 10 can be the surface of the bottom plate of the second box body 12 facing the first box body 11 along the first direction Z. The figure shows that the first direction Z is the up-down direction.

[0124] The gap 20A between the adjacent battery cells 20 may be formed between two or more battery cells 20. Figure 4 , showing that a gap 20A is formed between four battery cells 20, and the four battery cells 20 are arranged in two rows and two columns. It can be understood that the adjacent plurality of battery cells 20 can be two, three, five, six or more, and the arrangement is not limited.

[0125] The glue guide 30 can be inserted into the gap 20A and squeeze the colloid on the bearing surface 101, so that the colloid enters the first glue guide cavity 33 through the first glue inlet 31 and flows from bottom to top (anti-gravity direction) to the first glue overflow port 32 under the guidance of the first glue guide cavity 33. The colloid overflowing from the first glue overflow port 32 flows out from top to bottom to fill between the first side surface 301 and the corresponding battery cell 20, so that multiple adjacent battery cells 20 are bonded together through the glue guide 30 from the bearing surface 101, and the glue guide 30 is fixed to the bearing surface 101 through the colloid.

[0126] The glue guide 30 guides the glue on the bearing surface 101 into the first glue guide cavity 33 through the first glue inlet 31, and the glue in the first glue guide cavity 33 is guided from bottom to top to the first glue overflow port 32. The glue overflowing from the first glue overflow port 32 flows from top to bottom between the first side surface 301 and the corresponding battery cell 20, and the multiple battery cells 20 and the glue guide 30 are all bonded to the bearing surface 101 through the glue. Therefore, the overall strength of the battery device 100 can be improved. When the battery device 100 is subjected to vibration impact, the risk of shaking between the multiple battery cells 20 can be greatly reduced, thereby improving reliability.

[0127] In some embodiments, along the first direction Z, the size of the battery cell 20 is H1, the distance between the first glue overflow opening 32 and the carrying surface 101 is H2, and H1 / 2≤H2≤H1 is satisfied. The first direction Z is perpendicular to the carrying surface 101 .

[0128] The size H1 of the battery cell 20 may be the height of the battery cell 20. Fig.10, the dimension H1 of the battery cell 20 is the distance between the end cover 212 and the bottom surface 204. Since the bottom surface 204 of the battery cell 20 is bonded to the bearing surface 101, the distance between the end cover 212 and the bottom surface 204 can be approximately the distance between the end cover 212 and the bearing surface 101. H2 can be the distance between the center of the first glue overflow port 32 and the bearing surface 101. The bottom surface 204 of the battery cell 20 can be approximately flush with the bottom surface 303 of the glue guide 30.

[0129] As an example, the first glue overflow opening 32 corresponds to the upper middle position of the battery cell 20 and does not exceed the end cover 212 of the battery cell 20 .

[0130] Thus, the colloid overflowing from the first glue overflow port 32 can flow from a higher position (upper position) of the battery cell 20 from top to bottom into the gap between the first side surface 301 and the corresponding battery cell 20, so that the colloid can more fully fill the gap between the glue guide 30 and the battery cell 20, thereby improving the stability between the multiple battery cells 20 and the glue guide 30; in addition, the colloid overflowing from the first glue overflow port 32 can also be blocked by the battery cell 20, reducing the risk of colloid outflow and improving the bonding effect.

[0131] In some embodiments, reference Figure 8 The first glue guiding cavity 33 extends along the first direction Z, the first glue overflow port 32 is a first channel, one end of the first channel extends to the inner wall 302 of the first glue guiding cavity 33, and the other end extends to the first side surface 301, and the first direction Z is perpendicular to the bearing surface 101.

[0132] The first glue guiding cavity 33 can extend along the first direction Z to approach but not penetrate an end away from the bearing surface 101. Under the pressure of the glue guiding member 30, the glue on the bearing surface 101 enters the first glue guiding cavity 33 through the first glue inlet 31, flows in through one end of the first channel, and flows out in a directional manner at the other end. The extension direction of the first channel can be perpendicular to the first direction Z.

[0133] By using the first glue overflow opening 32 as the first channel, the overflowed glue can be better guided to between the first side surface 301 and the corresponding battery cell 20 , thereby improving the bonding effect.

[0134] In some embodiments, reference Figure 8 A plurality of first glue overflow openings 32 are disposed on each first side surface 301 . The plurality of first glue overflow openings 32 are spaced apart along a first direction Z, and the first direction Z is perpendicular to the bearing surface 101 .

[0135] The plurality of first glue overflow openings 32 may be arranged at equal intervals or at unequal intervals along the first direction Z. The number of the plurality of first glue overflow openings 32 may be two, three, four or more.

[0136] The plurality of first glue overflow openings 32 are arranged at intervals along the first direction Z, so that the overflowed glue flows to different positions between the first side surface 301 and the corresponding battery cell 20 , so that the glue is filled more fully, thereby making the bonding more uniform and reliable.

[0137] In some embodiments, the first glue guiding cavity 33 is a cylindrical cavity.

[0138] The cylindrical cavity forms a straight channel, which helps to minimize the glue feeding path compared to a curved channel, allowing more colloid on the bearing surface 101 to quickly pass through the cylindrical cavity and overflow from the first glue overflow port 32, thereby reducing colloid waste caused by unnecessary colloid retention in the first glue guide cavity 33; in addition, the cylindrical cavity is easy to process and improves manufacturing efficiency.

[0139] Of course, the first glue guiding cavity 33 is not limited to a cylindrical cavity, and may also be a cavity of other shapes, such as a polygonal cavity.

[0140] In some embodiments, the glue guiding member 30 includes a bottom surface 303 facing the supporting surface 101 , and the first glue inlet 31 is disposed on the bottom surface 303 .

[0141] When the glue guide 30 is inserted into the gaps 20A between the adjacent battery cells 20 , the bottom surface of the glue guide 30 squeezes the glue on the bearing surface 101 , and the glue enters the first glue guide cavity 33 from bottom to top through the first glue inlet 31 .

[0142] Since the first glue inlet 31 is disposed on the bottom surface 303 , the glue can enter the first glue guiding cavity 33 more easily, so that the glue can overflow from the first glue overflow port 32 efficiently.

[0143] In some embodiments, the first glue inlet 31 is a first groove ( Fig.12 As shown in FIG. 1 ), one end of the first glue guiding cavity 33 passes through the bottom wall 31a of the first groove; wherein the first groove is filled with colloid.

[0144] When the glue guide 30 is inserted into the gap 20A between the adjacent multiple battery cells 20 and squeezes the colloid on the supporting surface 101, the first groove plays a role of gathering the glue, gathering more colloid on the supporting surface 101 into the first groove, thereby increasing the amount of glue entering, and then allowing the colloid to more fully fill the first side surface 301 and the corresponding battery cell 20, thereby improving the bonding effect.

[0145] In some embodiments, reference Figures 6 to 8 A second glue inlet 34 is also provided on the bottom surface 303, and a second glue overflow port 35 is also provided on the first side surface. A second glue guiding cavity 36 connecting the second glue inlet 34 and the second glue overflow port 35 is also formed inside the glue guiding component 30; wherein, along the first direction Z, the second glue overflow port 35 is closer to the bottom surface 303 than the first glue overflow port 32, and the first direction Z is perpendicular to the bearing surface 101.

[0146] When the glue guide 30 is inserted into the gap 20A between the adjacent multiple battery cells 20 and squeezes the glue on the supporting surface 101, the glue also enters the second glue guide cavity 36 through the second glue inlet 34 and overflows through the second glue overflow port 35 to a position between the first side surface 301 and the corresponding battery cell 20 near the bottom surface 303.

[0147] Thus, the bonding effect between the first side surface 301 and the corresponding battery cell 20 near the bottom surface 303 can be improved. The first glue overflow port 32 can make the glue between the first side surface 301 and the corresponding glue guide 30 more uniform along the first direction, thereby improving the bonding effect.

[0148] In some embodiments, reference Fig.11 and Fig.12 The second glue inlet 34 is arranged around the first glue inlet 31 , and the second glue guiding cavity 36 is arranged around the first glue guiding cavity 33 .

[0149] The shape of the second glue inlet 34 can be the same as or different from the shape of the first glue inlet 31. The shape of the second glue guiding cavity 36 can be the same as or different from the shape of the first glue guiding cavity 33.

[0150] Therefore, the second glue inlet 34 is arranged around the first glue inlet 31, and the second glue guiding cavity 36 is arranged around the first glue guiding cavity 33, so that the second glue inlet 34 and the first glue inlet 31 are two independent glue inlets, and the second glue guiding cavity 36 and the first glue guiding cavity 33 are two independent cavities, so that glue feeding, glue guiding and glue overflow can be carried out simultaneously and have almost no influence on each other, thereby improving the bonding reliability.

[0151] In some embodiments, the plurality of battery cells 20 include at least four battery cells 20 arranged in two rows and two columns, each row of battery cells 20 is arranged along a second direction X, and each column of battery cells 20 is arranged along a third direction Y, the second direction X and the third direction Y are perpendicular to each other and parallel to the carrying surface 101; each battery cell 20 includes a second side surface 201 perpendicular to the second direction X, a third side surface 202 perpendicular to the third direction Y, and a transition surface 203 connecting the second side surface 201 and the third side surface 202; the adhesive guide 30 is disposed in the gap 20A between the four battery cells 20, the adhesive guide 30 includes four first side surfaces 301, and the four first side surfaces 301 are respectively opposite to the transition surfaces 203 of the four battery cells 20, and each first side surface 301 is bonded to the relative transition surface 203 by adhesive.

[0152] As an example, see Figure 4 and Figure 5The third side surface 202 may be the surface with the largest surface area among the battery cells 20, i.e., the so-called "large surface". The second side surface 201 may be the surface adjacent to the third side surface 202 and having a smaller surface area, i.e., the so-called "narrow surface". Each column of battery cells 20 is arranged along the third direction Y with the "large surfaces" facing each other. Each row of battery cells 20 is arranged along the second direction X with the "narrow surfaces" facing each other.

[0153] Optionally, a buffer 40 may be provided between each column of battery cells 20 and between each row of battery cells 20. The buffer 40 may be, for example, foam or the like.

[0154] Due to the presence of the transition surface 203, there is a gap 20A between the four battery cells 20. The adhesive conductive member 30 is disposed in the gap 20A between the four battery cells 20, utilizing the gap 20A without occupying additional space, and reliably bonding the four battery cells 20 together without reducing the volume energy density of the battery device 100.

[0155] In some embodiments, the shape of the first side surface 301 matches the shape of the transition surface 203 .

[0156] This helps the colloid to be evenly filled between the first side surface 301 and the transition surface 203 , and the colloid can be fully bonded to both the first side surface 301 and the transition surface 203 , thereby improving the bonding effect.

[0157] In some embodiments, reference Fig.13 and Fig.14 , the transition surface 203 is a first arc surface; the first side surface 301 is a second arc surface.

[0158] The arc surface helps to increase the bonding area with the colloid, thereby improving the bonding effect.

[0159] In some embodiments, the arc radius R2 of the second arc surface is smaller than the arc radius R1 of the first arc surface, so that a gap for filling the colloid is formed between the first side surface 301 and the transition surface 203 .

[0160] This helps to increase the amount of colloid filled between the first side surface 301 and the transition surface 203, thereby improving the bonding effect.

[0161] In some embodiments, reference Figures 15 to 17 The second arc surface (the first side surface 301 ) is formed with a protrusion 37 , and the protrusion 37 abuts against the first arc surface (the transition surface 203 ), so that a gap for filling the colloid is formed between the first side surface 301 and the transition surface 203 .

[0162] Protrusions 37 may be formed on the second arc surface (first side surface 301 ) at one end close to the bottom surface 303 and / or at one end away from the bottom surface 303 , respectively, so that the colloid remains in the gap between the first side surface 301 and the transition surface 203 .

[0163] The protrusion 37 is formed on the second arc surface (first side surface 301), so that a gap for filling the colloid is formed between the first side surface 301 and the transition surface 203, which helps to increase the amount of colloid filled between the first side surface 301 and the transition surface 203, and also helps the colloid to remain in the gap between the first side surface 301 and the transition surface 203, thereby improving the bonding effect.

[0164] In some embodiments, the material of the adhesive guide 30 is fiber reinforced resin.

[0165] The fiber-reinforced resin may be a carbon fiber-reinforced resin, a glass fiber-reinforced resin, or the like.

[0166] The material of the rubber conductive member 30 is fiber-reinforced resin, which can not only meet the strength requirement but also help reduce weight, thereby making the battery device 100 lightweight.

[0167] Below, refer to Figures 2 to 17 , a specific example of the present application is described in detail.

[0168] The embodiment of the present application provides a battery device 100 , including a box body 10 , a plurality of battery cells 20 , and a rubber conductive member 30 .

[0169] The box 10 includes a bottom plate, which has a bearing surface 101, and the bearing surface 101 is coated with colloid. The battery cells 20 are bonded to the bearing surface 101 by colloid, and a gap 20A is formed between four adjacent battery cells 20. The four battery cells 20 are arranged in two rows and two columns, each row of battery cells 20 is arranged along the second direction X, and each column of battery cells 20 is arranged along the third direction Y. The second direction X and the third direction Y are perpendicular to each other and parallel to the bearing surface 101. Each battery cell 20 includes two second side surfaces 201 perpendicular to the second direction X, two third side surfaces 202 perpendicular to the third direction Y, and an arc transition surface 203 connecting the second side surfaces 201 and the third side surfaces 202; the third side surface 202 is the surface with the largest surface area in the battery cell 20, that is, the so-called "large surface". The second side surface 201 is a surface adjacent to the third side surface 202 and with a smaller surface area, that is, the so-called "narrow surface". The battery cells 20 in each column are arranged in a manner of "large surfaces" facing each other along the third direction Y. Each row of battery cells 20 is arranged in a manner that the “narrow sides” face each other along the second direction X. A buffer 40 may be disposed between each column of battery cells 20 and between each row of battery cells 20 .

[0170] The adhesive guiding member 30 is disposed in the gap 20A between the four battery cells 20 . The adhesive guiding member 30 includes four first side surfaces 301 , and the four first side surfaces 301 are respectively opposite to the transition surfaces 203 of the four battery cells 20 .

[0171] A cylindrical first glue guiding cavity 33 and a second glue guiding cavity 36 surrounding the first glue guiding cavity 33 are formed inside the glue guiding member 30. The first glue guiding cavity 33 and the second glue guiding cavity 36 both extend along a first direction Z, and the first direction is perpendicular to the bearing surface 101. A first glue inlet 31 communicating with the first glue guiding cavity 33 and a second glue inlet 34 surrounding the first glue inlet 31 and communicating with the second glue guiding cavity 36 are formed on the bottom surface 303 of the glue guiding member 30 facing the bearing surface 101. The first glue inlet 31 is a first groove, and the first glue guiding cavity 33 passes through the bottom wall of the first groove. Two first glue overflow ports 32 and one second glue overflow port 35 spaced apart along the first direction Z are provided on each first side surface 301. The two first glue overflow ports 32 are both communicated with the first glue guiding cavity 33, and the second glue overflow port 35 is communicated with the second glue guiding cavity 36. The second glue overflow port 35 is closer to the bottom surface 303 than the first glue overflow port 32.

[0172] The glue guide 30 is inserted into the gap 20A between the four battery cells 20 and squeezes the colloid on the bearing surface 101. The colloid gathers at the first glue inlet 31 and enters the first glue guide cavity 33, overflows through the first glue overflow port 32 to the middle upper position between the first side surface 301 and the relative transition surface 203 and flows from top to bottom. The colloid also enters the second glue guide cavity 36 through the second glue inlet 34, overflows through the second glue overflow port 35 to the approximate middle position between the first side surface 301 and the relative transition surface 203 and flows from top to bottom. As a result, the four first side surfaces 301 of the glue guide 30 are respectively bonded to the four relative transition surfaces 203.

[0173] Reference Figure 1 , an embodiment of the present application further provides an electrical device, including: the battery device 100 mentioned above.

[0174] Reference Fig.18 The embodiment of the present application also provides a method for manufacturing a battery device, including: step S11, step S12 and step S13.

[0175] Step S11, coating the colloid on the bearing surface 101 of the box body 10; The colloid coated on the bearing surface 101 has certain fluidity and viscosity and can be solidified after a certain period of time.

[0176] Step S12, placing a plurality of battery cells 20 on the carrying surface 101; Since the carrying surface 101 is coated with colloid, the plurality of battery cells 20 are bonded to the carrying surface 101 through the colloid.

[0177] Step S13, inserting the glue guide 30 into the gap 20A between the plurality of battery cells 20, and squeezing the glue so that the glue enters the first glue guiding cavity 33 inside the glue guide 30 from the first glue inlet 31 of the glue guide 30, and flows out from the first glue overflow port 32 connected to the first glue guiding cavity 33 to fill the gap between the glue guide 30 and each battery cell 20; wherein the first glue guiding cavity extends along a first direction, and the first direction is parallel to the direction of gravity.

[0178] The colloid on the bearing surface 101 is squeezed by the glue guide 30, so that the colloid is introduced into the first glue guide cavity 33 through the first glue inlet 31. Under the guidance of the first glue guide cavity 33, the colloid flows from bottom to top (in the anti-gravity direction) to the first glue overflow port 32. The colloid overflowing from the first glue overflow port 32 flows out from top to bottom to between the glue guide 30 and the battery cell 20, so that the multiple battery cells 20 are firmly bonded to the glue guide 30 through the colloid from the bearing surface 101, and the multiple battery cells 20 are bonded to the box body 10. Therefore, when the battery device 100 is subjected to vibration impact, the risk of shaking between the multiple battery cells 20 can be greatly reduced, thereby improving reliability.

[0179] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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 device, characterized in that: include: The box body has a bearing surface, and the bearing surface is provided with a colloid; A plurality of battery cells are disposed in the box, and the battery cells are bonded to the carrying surface through the colloid; A glue guide member is disposed in the gaps between the adjacent battery cells, and the glue guide member is bonded to the bearing surface through the colloid; Wherein, a first glue inlet is provided at one end of the glue guide member close to the bearing surface, the glue guide member comprises a plurality of first side surfaces facing the adjacent plurality of battery cells respectively, a first glue overflow port is provided on the first side surfaces, and each of the first side surfaces is bonded to the corresponding battery cell through the colloid; A first glue guiding cavity communicating with the first glue inlet and the first glue overflow outlet is formed inside the glue guiding member, and the first glue guiding cavity extends along a first direction, and the first direction is parallel to the direction of gravity.

2. The battery device according to claim 1, characterized in that: Along the first direction, the size of the battery cell is H1, the distance between the first glue overflow port and the bearing surface is H2, satisfying H1 / 2≤H2≤H1, and the first direction is perpendicular to the bearing surface.

3. The battery device according to claim 1, characterized in that: The first glue guiding cavity extends along the first direction, the first glue overflow port is a first channel, one end of the first channel extends to the inner wall of the first glue guiding cavity, and the other end extends to the first side surface, and the first direction is perpendicular to the bearing surface.

4. The battery device according to claim 1, characterized in that: A plurality of the first glue overflow openings are arranged on each of the first side surfaces, and the plurality of the first glue overflow openings are arranged at intervals along the first direction, and the first direction is perpendicular to the bearing surface.

5. The battery device according to claim 1, characterized in that: The first glue guiding cavity is a cylindrical cavity.

6. The battery device according to claim 1, characterized in that: The glue guiding member comprises a bottom surface facing the bearing surface, and the first glue inlet is arranged on the bottom surface.

7. The battery device according to claim 6, characterized in that: The first glue inlet is a first groove, and one end of the first glue guiding cavity passes through the bottom wall of the first groove; Wherein, the first groove is filled with the colloid.

8. The battery device according to claim 6, characterized in that: A second glue inlet is also provided on the bottom surface, a second glue overflow outlet is also provided on the first side surface, and a second glue guiding cavity communicating with the second glue inlet and the second glue overflow outlet is formed inside the glue guiding member; Wherein, along the first direction, the second glue overflow port is closer to the bottom surface than the first glue overflow port, and the first direction is perpendicular to the bearing surface.

9. The battery device according to claim 8, characterized in that: The second glue inlet is arranged around the first glue inlet, and the second glue guiding cavity is arranged around the first glue guiding cavity.

10. The battery device according to any one of claims 1 to 9, characterized in that: The plurality of battery cells at least include four battery cells arranged in two rows and two columns, each row of battery cells is arranged along the second direction, each column of battery cells is arranged along the third direction, and the second direction and the third direction are perpendicular to each other and parallel to the carrying surface; Each of the battery cells comprises a second side surface perpendicular to the second direction, a third side surface perpendicular to the third direction, and a transition surface connecting the second side surface and the third side surface; The adhesive guide is arranged in the gap between the four battery cells, and includes four first side surfaces, and the four first side surfaces are respectively opposite to the transition surfaces of the four battery cells, and each first side surface is bonded to the corresponding transition surface through the adhesive.

11. The battery device according to claim 10, characterized in that: The shape of the first side surface is adapted to the shape of the transition surface.

12. The battery device according to claim 11, characterized in that: The transition surface is a first arc surface; The first side surface is a second arc surface.

13. The battery device according to claim 12, characterized in that: The arc radius of the second arc surface is smaller than the arc radius of the first arc surface, so that a gap for filling the colloid is formed between the first side surface and the transition surface.

14. The battery device according to claim 12, characterized in that: The second arc surface is formed with a protrusion, and the protrusion abuts against the first arc surface, so that a gap for filling the colloid is formed between the first side surface and the transition surface.

15. The battery device according to claim 1, characterized in that: The material of the rubber guiding part is fiber reinforced resin.

16. An electrical device, characterized in that: include: A battery device as claimed in any one of claims 1 to 15.

17. A method for manufacturing a battery device, characterized in that: include: Apply colloid on the bearing surface of the box; Placing a plurality of battery cells on the carrying surface; Inserting a glue guide into the gaps between the adjacent battery cells, and squeezing the glue so that the glue enters the first glue guide cavity inside the glue guide from the first glue inlet of the glue guide, and flows out from the first glue overflow port connected to the first glue guide cavity to fill the gaps between the glue guide and the battery cells; Wherein, the first glue guiding cavity extends along a first direction, and the first direction is parallel to the direction of gravity.

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