Battery and electric device

Abstract

The embodiment of the invention provides a battery and an electric device. A battery includes: a plurality of battery cells (10); and a buffer assembly (20) located on opposite surfaces (10f; 10f) of two adjacent battery cells (10) of the plurality of battery cells (10); the buffer assembly (20) is arranged between the opposite surfaces (10f, 10f '), the buffer assembly (20) comprises at least two buffer pads, the at least two buffer pads are arranged at least in a first direction (z) at intervals, the projection ranges of the at least two buffer pads in the first direction (z) are not overlapped, and the first direction (z) is parallel to at least one of the opposite surfaces (10f, 10f').

Description

Technical Field

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

[0002] Secondary batteries, especially lithium-ion batteries, have the advantages of high voltage, high specific energy, long cycle life, green and pollution-free, wide operating temperature range and low self-discharge. They are widely used in portable electronic devices, energy storage devices and power equipment of large new energy electric vehicles, and are of great significance to solving human environmental pollution and energy crisis. With the widespread application of lithium-ion batteries, reducing battery costs has become a problem that producers pay close attention to. Summary of the invention

[0003] In one aspect of the present disclosure, a battery is provided, comprising: a plurality of battery cells; and a buffer assembly located between relative surfaces of two adjacent battery cells among the plurality of battery cells, wherein the buffer assembly comprises at least two buffer pads, the at least two buffer pads are arranged at intervals along at least a first direction, and their projection ranges in the first direction do not overlap, and the first direction is parallel to at least one of the relative surfaces.

[0004] Since the battery cells generate expansion force during the use of the battery, a buffer component is arranged between the relative surfaces of two adjacent battery cells. The buffering effect of the buffer component can alleviate the impact of the expansion force on the battery and absorb the assembly differences between the battery cells when assembling the battery. The buffer component can form a hollow part between the buffer pads by setting at least two buffer pads arranged at intervals in the first direction and with non-overlapping projection ranges, which can easily absorb the expansion and deformation of the battery cells. Compared with the closed-shaped buffer components formed by assembly in the related art, the buffer pads arranged at intervals in this embodiment can reduce the amount of buffer pad materials used, reduce costs, and do not require assembly, thereby reducing the difficulty of battery assembly and the requirements for assembly accuracy.

[0005] In some embodiments, the first direction is parallel to the height direction of the two adjacent battery cells, the at least two buffer pads include a first buffer pad, the first buffer pad is the lowest buffer pad among the at least two buffer pads, the first buffer pad is continuous in the second direction, the second direction is perpendicular to the first direction, and is parallel to at least one of the relative surfaces.

[0006] For the first buffer pad located at the bottom of at least two buffer pads, by making it continuous in the second direction, when the battery cell is glued on the lower side, the glue is not easy to enter the hollow area located on the upper side of the first buffer pad in the range sandwiched by the two adjacent battery cells under the blocking of the first buffer pad, thus reducing the possibility of glue entering the hollow area and occupying the expansion and deformation space of the battery cell, thereby improving the buffering effect of the buffer assembly on the expansion force of the battery cell, and further increasing the service life of the battery. In addition, if the glue enters the lower position of the hollow area, the distribution of the glue in the range sandwiched by the two adjacent battery cells in the first direction will be uneven, resulting in bending stress caused by inconsistent expansion and deformation of the battery cell from top to bottom. Through the blocking effect of the first buffer pad on the lower glue, the uniformity of the distribution of the glue in the first direction in the range sandwiched by the two adjacent battery cells can be improved, and the bending stress caused by the expansion of the battery cell can be reduced.

[0007] In some embodiments, the first buffer pad includes a first buffer segment having a first side adjacent to a bottom surface of the battery cell and parallel to the second direction.

[0008] The first buffer segment has a first side edge adjacent to the bottom surface of the battery cell and parallel to the second direction, so that the first buffer pad is straight and continuous at the first side edge close to the bottom surface of the battery cell. On the one hand, it can reduce the amount of glue entering the space enclosed by the relative surfaces, and on the other hand, it can also evenly block the glue on the lower side of the battery cell along the second direction, thereby improving the uniformity of the distribution of the glue in the second direction within the range sandwiched by two adjacent battery cells, thereby reducing the bending stress caused by the expansion of the battery cell.

[0009] In some embodiments, the first buffer pad further includes a second buffer segment and a third buffer segment, both connected to the first buffer segment and extending in a direction away from the bottom surface of the battery cell, and the second buffer segment and the third buffer segment are spaced apart along the second direction.

[0010] The second buffer segment and the third buffer segment are both connected to the first buffer pad and extend in a direction away from the bottom surface of the battery cell, and the second buffer segment and the third buffer segment are spaced apart along the second direction, so that the second buffer segment and the third buffer segment block the glue from entering the space between the second buffer segment and the third buffer segment from the side, thereby achieving the lateral glue blocking effect, and combined with the lower glue blocking effect achieved by the first buffer segment, the first buffer pad can effectively reduce the amount of glue on the lower side of the battery cell that enters the space enclosed by the relative surface, thereby reducing the risk of glue occupying the space for expansion and deformation of the battery cell, thereby improving the buffering effect of the buffer assembly on the expansion force of the battery cell.

[0011] In some embodiments, the second buffer segment and the third buffer segment are respectively connected to two ends of the first buffer segment along the second direction.

[0012] Connecting the second buffer segment and the third buffer segment to the two ends of the first buffer segment along the second direction can make the second buffer segment and the third buffer segment closer to the sides of the battery cell, reduce the amount of glue entering between the relative surfaces, and reduce the risk of glue occupying the space for expansion and deformation of the battery cell, thereby improving the buffering effect of the buffer assembly on the expansion force of the battery cell.

[0013] In some embodiments, the second buffer segment has a second side adjacent to the first side of the battery cell and parallel to the first side, the third buffer segment has a third side adjacent to the second side of the battery cell and parallel to the second side, and the first side and the second side are both connected to the bottom surface and are opposite to each other along the second direction.

[0014] The first buffer pad has straight edges on both sides and the bottom, which can more effectively reduce the amount of glue entering between the opposite surfaces and improve the distribution uniformity of the glue in the first direction and the second direction within the range sandwiched by two adjacent battery cells compared to non-straight edges.

[0015] In some embodiments, a cross-section of the first buffer pad in a third direction is U-shaped, the U-shape has a vertically upward opening, and the third direction is perpendicular to both the first direction and the second direction.

[0016] The U-shaped first buffer pad can reduce the amount of buffer pad material used to a greater extent, reduce costs, and can achieve a glue blocking effect through the three adjacent sides of the U shape, thereby reducing the amount of glue entering between the opposite surfaces.

[0017] In some embodiments, a ratio h / w of a maximum dimension h of the first buffer pad in the first direction to a maximum dimension w of the first buffer pad in the second direction satisfies: 0.05≤h / w≤10.

[0018] For the U-shaped first buffer, if the ratio h / w is too large, more buffer material is needed. If it is too small, the lateral glue blocking effect is relatively limited, and there is a risk that more glue will enter between the opposite surfaces from the side and occupy the expansion and deformation space of the battery cell. Therefore, by making the ratio h / w satisfy 0.05≤h / w≤10, the glue blocking effect of the first buffer and the saving of material consumption can be taken into account.

[0019] In some embodiments, the ratio h / w satisfies: 0.1≤h / w≤5.

[0020] By further limiting the ratio h / w to satisfy 0.1≤h / w≤5, the rubber blocking function of the first buffer pad can be more effectively achieved, and the amount of buffer pad material can be saved, thereby reducing costs.

[0021] In some embodiments, the at least two buffer pads further include a second buffer pad located on a side of the first center plane of the battery cell away from the first buffer pad, and the first center plane is equidistant from the top and bottom surfaces of the battery cell along the first direction.

[0022] The battery cell is divided by the first center plane, and the second buffer pad and the first buffer pad are located on both sides of the first center plane. This is conducive to making the buffering effect of the buffer assembly uniform in the first direction, alleviating the impact of the expansion force on the battery, and more evenly absorbing the assembly differences between the battery cells when assembling the battery.

[0023] In some embodiments, the second buffer pad is the same as the first buffer pad and is disposed opposite to the first buffer pad in the first direction.

[0024] By making the second buffer pad the same as the first buffer pad and setting them in reverse, this is conducive to batch production of buffer pads, and using them as the first buffer pad and the second buffer pad respectively, thereby improving manufacturing efficiency; moreover, the first buffer pad and the second buffer pad set in reverse in the first direction can achieve a more uniform buffering effect in the first direction, effectively alleviating the influence of the expansion force on the battery.

[0025] In some embodiments, a cross section of the second buffer pad in a third direction is rectangular, and the third direction is perpendicular to both the first direction and the second direction.

[0026] Taking into account that for the battery cells coated with glue on the bottom side, the second buffer pad does not need to meet the requirement of side glue blocking, so a rectangular cross-section structure can be adopted, so that a larger buffer pad material can be cut with a higher density, which is conducive to reducing material waste.

[0027] In some embodiments, the first buffer pad includes a first buffer segment, a second buffer segment and a third buffer segment, the first buffer segment has a first side adjacent to the bottom surface of the battery cell and parallel to the second direction, the second buffer segment and the third buffer segment are both connected to the first buffer segment and extend in a direction away from the bottom surface of the battery cell, and the second buffer segment and the third buffer segment are spaced apart along the second direction; the maximum dimension d1 of the part of the first buffer segment located between the second buffer segment and the third buffer segment in the first direction, the maximum dimension d2 of the second buffer segment in the second direction and the maximum dimension d3 of the third buffer segment in the second direction are all smaller than the maximum dimension d4 of the second buffer pad in the first direction.

[0028] For the second buffer pad with a rectangular cross-section, if its lower side adopts a first buffer pad including a first buffer segment and a second buffer segment and a third buffer segment connected to the first buffer segment, the maximum dimension d4 of the second buffer pad in the first direction can be made larger than the dimensions of the first buffer segment, the second buffer segment and the third buffer segment in the direction perpendicular to their extension directions. This is beneficial for the first buffer pad to use less buffer pad material and reduce costs.

[0029] In some embodiments, the cross-sectional areas of the first buffer pad and the second buffer pad in a third direction are equal, and the third direction is perpendicular to both the first direction and the second direction.

[0030] By making the cross-sectional areas of the first buffer pad and the second buffer pad in the third direction equal, the buffering effects of the expansion force of the first buffer pad and the second buffer pad during battery use can be more consistent, thereby reducing the bending stress caused by the expansion of the battery cell.

[0031] In some embodiments, the buffer assembly is symmetrical with respect to a first center plane passing through the battery cell, and the first center plane is equidistant from the top and bottom surfaces of the battery cell along the first direction; and / or, the buffer assembly is symmetrical with respect to a second center plane passing through the battery cell, and the second center plane is equidistant from the first side and second side surfaces of the battery cell along the second direction, the second direction is perpendicular to the first direction and parallel to at least one of the relative surfaces, and the first side surface and the second side surface are opposite along the second direction.

[0032] By making the buffer assembly symmetrical with respect to the first center plane or the second center plane of the battery cell, or symmetrical with respect to the first center plane and the second center plane of the battery cell, the buffering effect of the expansion force of the first buffer pad and the second buffer pad during the use of the battery can be made more consistent, thereby reducing the bending stress caused by the expansion of the battery cell.

[0033] In some embodiments, the multiple battery cells include at least one battery cell group, the battery includes at least one battery module, which corresponds one to one with the at least one battery cell group, each battery module includes two end plates, a hoop and a corresponding battery cell group, the battery cells in each battery cell group are arranged along a third direction, the third direction is perpendicular to at least one of the relative surfaces, the buffer assembly is bonded to the relative surfaces, the two end plates are respectively located on both sides of the corresponding battery cell group along the third direction, and the hoop is sleeved on the outer periphery of the two end plates to tighten the two end plates and the corresponding battery cell group.

[0034] For a battery including a battery module, by providing two end plates located on both sides of the battery cell group in the battery module and tightening them with a hoop, the overall strength of the battery module can be improved and the risk of cracking of the battery module due to large expansion of the battery cells can be reduced.

[0035] In some embodiments, the battery further includes: a box body, accommodating the at least one battery module; and a heat exchange element, located in the box body; wherein the at least one battery module is located on the upper side of the heat exchange element and is connected to the heat exchange element by thermal conductive adhesive.

[0036] When connecting the heat exchange component to multiple battery modules through thermally conductive adhesive, the buffer pad in the battery module can also block the amount of thermally conductive adhesive that enters between the relative surfaces of two adjacent battery cells, thereby reducing the risk of glue occupying the space for battery cell expansion and deformation.

[0037] In some embodiments, the battery further comprises: a box body accommodating the plurality of battery cells; and a heat exchange element located in the box body; wherein the plurality of battery cells are located on the upper side of the heat exchange element and connected to the heat exchange element via thermally conductive adhesive.

[0038] For the connection between the heat exchange component and multiple battery cells through thermal conductive adhesive, the buffer pad can also block the amount of thermal conductive adhesive that enters between the relative surfaces of two adjacent battery cells, reducing the risk of glue occupying the space for battery cell expansion and deformation.

[0039] In one aspect of the present disclosure, there is provided an electrical device, comprising: the aforementioned battery.

[0040] The electric device using the battery is beneficial to reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments of the present disclosure will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0042] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0043] Figure 1 is a schematic diagram of the structure of some embodiments of the electric equipment disclosed in the present invention;

[0044] Figure 2 is an exploded schematic diagram of some embodiments of the battery according to the present disclosure;

[0045] Figure 3is a schematic diagram of the connection structure of multiple battery modules and heat exchange components according to some embodiments of the battery disclosed herein;

[0046] Figure 4 is a schematic diagram of the exploded structure of a battery module according to some embodiments of the battery disclosed herein;

[0047] Figure 5 is a schematic diagram of the installation structure of a battery module according to some embodiments of the battery disclosed herein;

[0048] Figure 6 yes Figure 4 A magnified schematic diagram of the structure in the middle;

[0049] Figure 7 is a schematic diagram of two adjacent battery cells and a buffer assembly therebetween according to some embodiments of the battery disclosed herein;

[0050] Fig. 8A is a schematic diagram of disposing a first buffer pad and a second buffer pad that are U-shaped and disposed inversely on a battery cell according to some embodiments of the battery disclosed herein;

[0051] Figure 8B yes Fig. 8A A schematic diagram of the three-dimensional structure of the first buffer pad and the second buffer pad;

[0052] Figure 8C yes Fig. 8A A schematic diagram of the dimensions of the first buffer pad and the second buffer pad;

[0053] Fig. 9A is a schematic diagram of disposing a U-shaped first buffer pad and a rectangular second buffer pad on a battery cell according to some embodiments of the battery disclosed herein;

[0054] Fig. 9B yes Fig. 9A A schematic diagram of the three-dimensional structure of the first buffer pad and the second buffer pad;

[0055] Fig. 9C yes Fig. 9A Schematic diagram of the dimensions of the first buffer pad and the second buffer pad.

[0056] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. Description of reference numerals:

[0057] 10 - battery cell; 10f, 10f' - opposite surfaces; 11 - first side surface; 12 - second side surface; 13 - bottom surface; 14 - top surface;

[0058] 20-buffer assembly; 21-first buffer pad; 211-first buffer section; 211e-first side edge; 212-second buffer section; 212e-second side edge; 213-third buffer section; 213e-third side edge; 22, 22'-second buffer pad;

[0059] 31-end plate; 32-hoop;

[0060] 40-battery; 41-battery module; 42-box; 43-heat exchange component; 44-thermal conductive adhesive; 45-box cover;

[0061] 50-Vehicles;

[0062] z-first direction; y-second direction; x-third direction; CP1-first center plane; CP2-second center plane. DETAILED DESCRIPTION

[0063] The following detailed description and drawings of the embodiments of the present disclosure are used to illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure, that is, the present disclosure is not limited to the described embodiments.

[0064] In the description of the present disclosure, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate positions or positional relationships only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0065] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present disclosure. In the description of the present disclosure, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0066] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0067] The term “plurality” appearing in the present disclosure refers to two or more (including two).

[0068] In the embodiment of the present disclosure, the battery cell in the battery may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0069] 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.

[0070] The battery cell includes an electrode assembly. The electrode assembly includes a first pole piece and a second pole piece with opposite polarities, and also includes a separator disposed between the first pole piece and the second pole piece. In some embodiments, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece. In other embodiments, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed back and forth between the positive pole piece and the negative pole piece. The separator is disposed between the positive pole piece and the negative pole piece, which can prevent the positive and negative poles from short-circuiting, while allowing active ions to pass through.

[0071] In some embodiments, the positive electrode sheet may include a positive electrode current collector substrate and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector substrate.

[0072] As an example, the positive electrode current collector substrate has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector substrate.

[0073] As an example, the positive electrode current collector substrate may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, 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 placing 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.).

[0074] As an example, the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as positive electrode active material layers of batteries may also be used. These positive electrode active material layers may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), 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 LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), 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 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0075] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate.

[0076] As an example, the negative electrode current collector substrate can be a metal foil, a foamed metal or a composite current collector. For example, as a metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by placing 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.).

[0077] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0078] As an example, the negative electrode current collector substrate has two surfaces facing each other in its thickness direction, and the negative electrode active material layer is disposed on any one or both of the two facing surfaces of the negative electrode current collector substrate.

[0079] As an example, the negative electrode active material layer may adopt the negative electrode active material layer for battery cells known in the art. As an example, the negative electrode active material layer 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 disclosure is not limited to these materials, and other traditional materials that can be used as negative electrode active material layers for batteries may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0080] In some embodiments, the material of the positive electrode current collector substrate may be aluminum, and the material of the negative electrode current collector substrate may be copper.

[0081] In some embodiments, the separator is a separator. The present disclosure has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0082] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive electrode sheet and the negative electrode sheet, or it can be located between the positive electrode sheet and the negative electrode sheet and attached to the surface of the positive electrode sheet and / or the surface of the negative electrode sheet.

[0083] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0084] In some embodiments, the battery cell further includes an electrolyte, which plays a role of conducting ions between the positive and negative electrodes. The present disclosure has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0085] As an example, the liquid electrolyte includes an electrolyte salt and a solvent.

[0086] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0087] In some embodiments, the solvent can be selected from 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, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can 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.

[0088] As an example, the gel electrolyte includes a polymer as the electrolyte skeleton network, combined with an ionic liquid-lithium salt.

[0089] As examples, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0090] 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.

[0091] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphide, germanium argentum sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0092] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0093] In some embodiments, the electrode assembly may be flat. The battery cell may be a prismatic battery cell, a soft pack battery cell, or a battery cell of other shapes.

[0094] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. 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.

[0095] As an example, the battery cell may be a soft-pack battery cell or a hard-shell battery cell. The hard-shell battery cell may be a prismatic battery cell, such as a square-shell battery cell, a blade-shaped battery cell, or a multi-prismatic battery. The multi-prismatic battery may be, for example, a hexagonal battery.

[0096] In some embodiments, the battery may include at least one battery module. The battery module may include a plurality of battery cells connected in series, in parallel, or in hybrid. The battery module may be housed in a box to form a battery. The box may serve as part of a chassis structure of a vehicle. For example, a portion of the box may become at least a portion of a floor of the vehicle, or a portion of the box may become at least a portion of a crossbeam and a longitudinal beam of the vehicle.

[0097] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0098] In some related technologies, the split cushions between two adjacent cells in the battery are spliced ​​into a square-shaped component. This type of cushion component requires more cushion materials, which is more expensive. In addition, the split cushions need to be assembled and connected to each other, which is more complicated in structure, increases the difficulty of production and assembly, and is not easy to control assembly accuracy.

[0099] In view of this, the embodiments of the present disclosure provide a battery and an electrical device that can reduce the amount of cushion material used, thereby helping to reduce costs.

[0100] In one aspect of the present disclosure, a battery is provided, comprising: a plurality of battery cells; and a buffer assembly located between relative surfaces of two adjacent battery cells among the plurality of battery cells, wherein the buffer assembly comprises at least two buffer pads, the at least two buffer pads are arranged at intervals along at least a first direction, and their projection ranges in the first direction do not overlap, and the first direction is parallel to at least one of the relative surfaces.

[0101] Since the battery cells generate expansion force during the use of the battery, a buffer component is arranged between the relative surfaces of two adjacent battery cells. The buffering effect of the buffer component can alleviate the impact of the expansion force on the battery and absorb the assembly differences between the battery cells when assembling the battery. The buffer component can form a hollow part between the buffer pads by setting at least two buffer pads arranged at intervals in the first direction and with non-overlapping projection ranges, which can easily absorb the expansion and deformation of the battery cells. Compared with the closed-shaped buffer components formed by assembly in the related art, the buffer pads arranged at intervals in this embodiment can reduce the amount of buffer pad materials used, reduce costs, and do not require assembly, thereby reducing the difficulty of battery assembly and the requirements for assembly accuracy.

[0102] The battery of the disclosed embodiment may include a case and a battery pack of a plurality of battery cells. The case is used to provide a storage space for a plurality of battery cells. In some embodiments, the battery may include a case and a battery module. The case is used to provide a storage space for the battery module, and the battery module is installed in the case. The case may be made of metal. The battery module may include a plurality of battery cells connected in series, in parallel or in mixed connection. A battery cell is the smallest unit that constitutes a battery. A battery cell includes an electrode assembly that can undergo an electrochemical reaction.

[0103] The battery of the embodiment of the present disclosure can be applied to various types of electrical equipment using batteries. Electrical equipment can be mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers. The embodiment of the present disclosure does not impose any special restrictions on the above-mentioned electrical equipment. The battery can be used to power electrical equipment such as vehicles, for example, to provide power for vehicle control or power for driving.

[0104] Figure 1 Schematic diagram of the structure of some embodiments of the electric device according to the present disclosure. For convenience, the electric device is a vehicle as an example for description. Figure 1 The vehicle 50 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle or a hybrid vehicle, etc. A battery 40 may be provided at the bottom, front or rear of the vehicle 50 .

[0105] The battery 40 can be used to power the vehicle 50. For example, the battery 40 can be used as an operating power source for the vehicle 50 and for the circuit system of the vehicle 50, such as for starting, navigating, and operating the vehicle 50. The battery 40 can not only be used as an operating power source for the vehicle 50, but also as a driving power source for the vehicle 50, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 50.

[0106] The vehicle 50 may also be provided with axles, wheels, motors, and controllers, and the controller is used to control the power supplied by the battery 40 to the motor. For example, when the vehicle 50 uses the battery 40 as a driving power source, the battery 40 replaces or partially replaces fuel or natural gas to provide the motor with the power required for uniform speed and acceleration. The motor is used to drive the axle to rotate, thereby driving the wheels to rotate.

[0107] Figure 2 is an exploded schematic diagram of some embodiments of the battery according to the present disclosure. Figure 3 Schematic diagram of the connection structure of multiple battery modules and heat exchange components in some embodiments of the battery disclosed herein. Figure 2 In some embodiments, the battery 40 includes a battery module 41, a box body 42, and a box cover 45 covering the open side of the box body 42. The box body 42 and the box cover 45 can provide a storage space for the battery module 41, and provide functions such as sealing and anti-collision, and can also prevent liquids or other foreign objects from adversely affecting the charging and discharging or safety of the battery module.

[0108] The box body 42 and the box cover 45 can be in various shapes, such as a cuboid or a cylinder. The box body 42 can be a hollow structure with one side open, and the box cover 45 can also be a hollow structure with one side open, and the open side of the box cover 45 covers the open side of the box body 42 to form an internal accommodation space. In other embodiments, the box cover 45 is a plate-like structure and covers the open side of the box body 41 to form an internal accommodation space.

[0109] In some embodiments, the battery 40 may include a plurality of battery modules 41, and the plurality of battery modules 41 may be arranged in the box 42 along at least one of the length direction and the width direction of the box 42. At least one row of battery modules 41 may be provided as required. As required, one or more layers of battery modules 41 may also be provided in the height direction of the battery 40.

[0110] refer to Figure 2 and Figure 3 In some embodiments, the battery 40 further includes a heat exchanger 44. The heat exchanger 44 is disposed in the box 42 and can be connected to each battery module 41 on the upper side thereof through a heat conductive adhesive 44. The heat exchanger 44 can cool and dissipate heat for the battery module, for example, the heat exchanger 44 includes a water cooling plate.

[0111] In other embodiments, the battery includes a plurality of battery cells, and the plurality of battery cells may be arranged in the casing along at least one of the length direction and the width direction of the casing. As required, one or more layers of battery cells may also be provided in the height direction of the battery. Furthermore, the battery may further include a heat exchanger, which is located in the casing. The plurality of battery cells are located on the upper side of the heat exchanger and are connected to the heat exchanger by a thermally conductive adhesive. The heat exchanger may cool and dissipate heat for the plurality of battery cells, for example, the heat exchanger may include a water cooling plate, etc.

[0112] Figure 4 Schematic diagram of the exploded structure of the battery module in some embodiments of the battery disclosed herein. Figure 5 It is a schematic diagram of the installation structure of the battery module in some embodiments of the battery disclosed herein. Figure 6 yes Figure 4 A magnified schematic diagram of the middle part of the structure. Figure 7 is a schematic diagram of two adjacent battery cells and a buffer assembly therebetween in some embodiments of the battery according to the present disclosure.

[0113] refer to Figure 4-Figure 7 The present disclosure provides a battery 41, including: a plurality of battery cells 10 and a buffer assembly 20. The battery cells 10 may include an electrode assembly, an electrolyte, and a housing for accommodating the electrode assembly and the electrolyte. Figure 4-Figure 6 In the embodiment, the battery cell 10 may be a square shell battery cell, or may be other structures, such as a blade-shaped battery cell, a polygonal prism battery, etc.

[0114] The buffer assembly 20 is located between the opposing surfaces of two adjacent battery cells 10 among the plurality of battery cells 10. The two adjacent battery cells 10 here may be a pair of battery cells among the plurality of battery cells 10, or may be a plurality of pairs of battery cells. Figure 7 , the opposite surfaces 10f and 10f' are surfaces of two adjacent battery cells 10 that are opposite to the other battery cell. The buffer component 20 can be bonded and fixed to at least one of the two adjacent battery cells 10. The buffer component 20 can be made of elastic materials, such as aerogel, composite fiber and the like.

[0115] Since battery cells generate expansion force during use of the battery, a buffer component is provided between the relative surfaces of two adjacent battery cells. The buffering effect of the buffer component can alleviate the impact of the expansion force on the battery and absorb the assembly differences between the battery cells when assembling the battery.

[0116] The buffer assembly 20 includes at least two buffer pads, and the at least two buffer pads are arranged at intervals along at least a first direction z, and the projection ranges in the first direction z do not overlap, and the first direction z is parallel to at least one of the relative surfaces 10f, 10f'. The relative surfaces 10f, 10f' can be parallel to each other or inclined at an angle. The first direction z can be parallel to the height direction of the battery cell 10, and can also be set to other directions in other embodiments.

[0117] The at least two buffer pads include two buffer pads or more buffer pads, and the buffer pads are arranged at intervals in the first direction z and the projection ranges in the first direction z do not overlap, so that a hollow portion v can be formed between the buffer pads, so as to absorb the expansion deformation of the battery cell through the hollow portion v. Compared with the closed-shaped buffer assembly formed by assembly in the related art, the buffer pads arranged at intervals in this embodiment can reduce the amount of buffer pad material used, reduce costs, and do not require assembly, thereby reducing the difficulty of battery assembly and the requirements for assembly accuracy.

[0118] refer to Figure 6 and Figure 7 In some embodiments, the first direction z is parallel to the height direction of the two adjacent battery cells 10, and the at least two buffer pads include a first buffer pad 21, which is the lowest buffer pad among the at least two buffer pads, and the first buffer pad 21 is continuous in the second direction y, and the second direction y is perpendicular to the first direction z and parallel to at least one of the relative surfaces 10f, 10f'.

[0119] For a square-shell battery cell, the first direction z and the second direction y are respectively parallel to the height direction and the width direction of the battery cell 10. The third direction x is parallel to the thickness direction of the battery cell 10, and a plurality of battery cells 10 can be arranged in sequence along the third direction x.

[0120] For the first buffer pad located at the bottom of the at least two buffer pads, by making it continuous in the second direction, when glue such as thermal conductive glue is applied on the lower side of the battery cell, the glue is not easy to enter the hollow area located on the upper side of the first buffer pad within the range sandwiched by two adjacent battery cells due to the blocking of the first buffer pad. This reduces the possibility of glue entering the hollow area and occupying the expansion and deformation space of the battery cell, thereby improving the buffering effect of the buffer assembly on the expansion force of the battery cell and further increasing the service life of the battery.

[0121] In addition, if the glue enters the lower part of the hollow area, the distribution of the glue in the first direction within the range between the two adjacent battery cells will be uneven, resulting in bending stress caused by inconsistent expansion and deformation of the battery cells. The first buffer pad blocks the glue on the lower side, which can improve the uniformity of the distribution of the glue in the first direction within the range between the two adjacent battery cells and reduce the bending stress caused by the expansion of the battery cells.

[0122] Fig. 8A Schematic diagram of the arrangement of a first buffer pad and a second buffer pad that are U-shaped and arranged in opposite directions on a battery cell according to some embodiments of the battery disclosed herein. Figure 8B yes Fig. 8A Schematic diagram of the three-dimensional structure of the first buffer pad and the second buffer pad. Figure 8C yes Fig. 8A Schematic diagram of the dimensions of the first buffer pad and the second buffer pad.

[0123] refer to Figure 6 and Fig. 8A In some embodiments, the first buffer pad 21 includes a first buffer segment 211 , and the first buffer segment 211 has a first side 211 e adjacent to the bottom surface 13 of the battery cell 10 and parallel to the second direction y.

[0124] The first buffer segment has a first side edge adjacent to the bottom surface of the battery cell and parallel to the second direction, so that the first buffer pad is straight and continuous at the first side edge close to the bottom surface of the battery cell. On the one hand, it can reduce the amount of glue entering the space enclosed by the relative surfaces, and on the other hand, it can also evenly block the glue on the lower side of the battery cell along the second direction, thereby improving the uniformity of the distribution of the glue in the second direction within the range sandwiched by two adjacent battery cells, thereby reducing the bending stress caused by the expansion of the battery cell.

[0125] In addition to entering the space enclosed by the opposite surfaces from the bottom side of the first buffer pad 21, the glue may also enter the space from the side. Figure 6 and Fig. 8A In some embodiments, the first buffer pad 21 further includes a second buffer segment 212 and a third buffer segment 213, both of which are connected to the first buffer segment 211 and extend in a direction away from the bottom surface 13 of the battery cell 10, and the second buffer segment 212 and the third buffer segment 213 are spaced apart along the second direction y.

[0126] The second buffer segment and the third buffer segment are both connected to the first buffer pad and extend in a direction away from the bottom surface of the battery cell, and the second buffer segment and the third buffer segment are spaced apart along the second direction, so that the second buffer segment and the third buffer segment block the glue from entering the space between the second buffer segment and the third buffer segment from the side, thereby achieving the lateral glue blocking effect, and combined with the lower glue blocking effect achieved by the first buffer segment, the first buffer pad can effectively reduce the amount of glue on the lower side of the battery cell that enters the space enclosed by the relative surface, thereby reducing the risk of glue occupying the space for expansion and deformation of the battery cell, thereby improving the buffering effect of the buffer assembly on the expansion force of the battery cell.

[0127] refer to Fig. 8A and Figure 8B In some embodiments, the second buffer segment 212 and the third buffer segment 213 are respectively connected to the two ends of the first buffer segment 211 along the second direction y. Here, the second buffer segment and the third buffer segment are connected to the two ends of the first buffer segment along the second direction, so that the second buffer segment and the third buffer segment can be closer to the side of the battery cell, reducing the amount of glue entering between the relative surfaces and reducing the risk of glue occupying the expansion and deformation space of the battery cell, thereby improving the buffering effect of the buffer assembly on the expansion force of the battery cell.

[0128] exist Figure 6 and Fig. 8A In the embodiment, the second buffer segment 212 may have a second side 212e adjacent to the first side 11 of the battery cell 10 and parallel to the first side 11, and the third buffer segment 213 may have a third side 213e adjacent to the second side 12 of the battery cell 10 and parallel to the second side 12, and the first side 11 and the second side 12 are both connected to the bottom surface 13 and are opposite to each other along the second direction y.

[0129] The first buffer pad has straight edges on both sides and the bottom, which can more effectively reduce the amount of glue entering between the opposite surfaces and improve the distribution uniformity of the glue in the first direction and the second direction within the range sandwiched by two adjacent battery cells compared to non-straight edges.

[0130] refer to Figure 6 and Figure 8A-8CIn some embodiments, the cross-section of the first buffer pad 21 in the third direction x is U-shaped, and the U-shape has a vertically upward opening, and the third direction x is perpendicular to both the first direction z and the second direction y. Correspondingly, no other buffer segments are arranged between the second buffer segment 212 and the third buffer segment 213 connected at both ends of the first buffer segment 211. Such a U-shaped first buffer pad can reduce the amount of buffer pad material used to a greater extent, reduce costs, and can achieve a glue blocking effect through the three adjacent sides of the U-shape, reducing the amount of glue entering between the relative surfaces. This U-shaped first buffer pad can be cut through typesetting layout, effectively improving material utilization.

[0131] refer to Figure 8C In some embodiments, a ratio h / w of a maximum dimension h of the first buffer pad 21 in the first direction z to a maximum dimension w of the first buffer pad 21 in the second direction y satisfies: 0.05≤h / w≤10.

[0132] For the U-shaped first buffer, if the ratio h / w is too large, more buffer material is needed. If it is too small, the lateral glue blocking effect is relatively limited, and there is a risk that more glue will enter between the opposite surfaces from the side and occupy the expansion and deformation space of the battery cell. Therefore, by making the ratio h / w satisfy 0.05≤h / w≤10, the glue blocking effect of the first buffer and the saving of material consumption can be taken into account.

[0133] Optionally, the ratio h / w satisfies: 0.1≤h / w≤5, for example, h / w is equal to 0.1, 0.5, 1, 2, 3, 4, 5, etc. By further limiting the ratio h / w to satisfy 0.1≤h / w≤5, the rubber blocking function of the first cushion can be more effectively achieved, and the amount of cushion material used can be saved, thereby reducing costs.

[0134] refer to Figure 6-Figure 8B In some embodiments, the at least two buffer pads further include a second buffer pad 22. Fig. 8A The second buffer pad 22 is located on a side of the first center plane CP1 of the battery cell 10 away from the first buffer pad 21 , and the first center plane CP1 is equidistant from the top surface 14 and the bottom surface 13 of the battery cell 10 along the first direction z.

[0135] The battery cell is divided by the first center plane, and the second buffer pad and the first buffer pad are located on both sides of the first center plane. This is conducive to making the buffering effect of the buffer assembly uniform in the first direction, alleviating the impact of the expansion force on the battery, and more evenly absorbing the assembly differences between the battery cells when assembling the battery.

[0136] In order to improve the production efficiency of the buffer assembly 20, refer to Fig. 8AIn some embodiments, the second cushion pad 22 is identical to the first cushion pad 21 and is disposed opposite to the first cushion pad 21 in the first direction z. The identical here means that the second cushion pad 22 is identical to the first cushion pad 21 not only in shape but also in size in all directions.

[0137] This is conducive to batch production of buffer pads, and they can be used as the first buffer pad 21 and the second buffer pad 22 respectively, thereby improving manufacturing efficiency; moreover, the first buffer pad 21 and the second buffer pad 22 arranged in opposite directions in the first direction z can achieve a more uniform buffering effect in the first direction z, effectively alleviating the influence of the expansion force on the battery.

[0138] Fig. 9A Schematic diagram of disposing a U-shaped first buffer pad and a rectangular second buffer pad on a battery cell in some embodiments of the battery disclosed herein. Fig. 9B yes Fig. 9A Schematic diagram of the three-dimensional structure of the first buffer pad and the second buffer pad. Fig. 9C yes Fig. 9A Schematic diagram of the dimensions of the first buffer pad and the second buffer pad.

[0139] and Figure 8A-8C Compared with the embodiment shown, Figure 9A-9C Another structure of the second buffer pad 22' is shown. Figure 9A-9C In some embodiments, the cross section of the second buffer pad 22; 22' in the third direction x is rectangular, and the third direction x is perpendicular to both the first direction z and the second direction y. For the battery cell with glue applied on the bottom side, the second buffer pad 22' does not need to meet the requirement of side glue blocking, so a rectangular cross-section structure can be adopted, so that a larger buffer pad material can be cut with a higher density, which is conducive to reducing material waste.

[0140] refer to Fig. 9C In some embodiments, the first buffer pad 21 includes a first buffer segment 211, a second buffer segment 212, and a third buffer segment 213. The first buffer segment 211 has a first side 211e adjacent to the bottom surface 13 of the battery cell 10 and parallel to the second direction y. The second buffer segment 212 and the third buffer segment 213 are both connected to the first buffer segment 211 and extend in a direction away from the bottom surface 13 of the battery cell 10. The second buffer segment 212 and the third buffer segment 213 are spaced apart along the second direction y.

[0141] The maximum dimension d1 of the portion of the first buffer segment 211 between the second buffer segment 212 and the third buffer segment 213 in the first direction z, the maximum dimension d2 of the second buffer segment 212 in the second direction y, and the maximum dimension d3 of the third buffer segment 213 in the second direction y are all smaller than the maximum dimension d4 of the second buffer pad 22; 22' in the first direction z.

[0142] For the second buffer pad 22' with a rectangular cross-section, when its lower side adopts the first buffer pad 21 including a first buffer segment 211 and a second buffer segment 212 and a third buffer segment 213 connected to the first buffer segment 211, by making the maximum dimension d4 of the second buffer pad 22' in the first direction z larger than the dimensions of the first buffer segment 211, the second buffer segment 212 and the third buffer segment 213 in the direction perpendicular to their extension directions, it is beneficial for the first buffer pad 21 to use less buffer pad material and reduce costs.

[0143] exist Figure 8A-8C In the embodiment shown, the first buffer pad 21 and the second buffer pad 22 may be identical, so that the cross-sectional shapes in the third direction x are identical and the areas are equal. Figure 9A-9C For the first buffer pad 21 and the second buffer pad 22' with different shapes shown, the cross-sectional areas of the first buffer pad 21 and the second buffer pad 22; 22' in the third direction x can be equal, and the third direction x is perpendicular to both the first direction z and the second direction y.

[0144] By making the cross-sectional areas of the first buffer pad 21 and the second buffer pad 22; 22' in the third direction x equal, the first buffer pad 21 and the second buffer pad 22; 22' can have more consistent buffering effects on the expansion force during battery use, thereby reducing the bending stress caused by the expansion of the battery cell.

[0145] refer to Fig. 8A and Fig. 9A In some embodiments, the buffer assembly 20 may be symmetrical with respect to a first center plane CP1 passing through the battery cell 10, and the first center plane CP1 is equidistant from the top surface 14 and the bottom surface 13 of the battery cell 10 along the first direction z. The buffer assembly 20 may also be symmetrical with respect to a second center plane CP2 passing through the battery cell 10, and the second center plane CP2 is equidistant from the first side surface 11 and the second side surface 12 of the battery cell along the second direction y. The second direction y is perpendicular to the first direction z and parallel to at least one of the opposing surfaces 10f, 10f', and the first side surface 11 and the second side surface 12 are opposite along the second direction y.

[0146] exist Fig. 8A In the embodiment, the buffer assembly 20 having the first buffer pad 21 and the second buffer pad 22 is symmetrical with respect to the first center plane CP1 and the second center plane CP2 of the battery cell 10. Fig. 9A In the embodiment, the buffer assembly 20 including the first buffer pad 21 and the second buffer pad 22 is symmetrical with respect to the second center plane CP2 of the battery cell 10 .

[0147] By making the buffer assembly symmetrical with respect to the first center plane or the second center plane of the battery cell, or symmetrical with respect to the first center plane and the second center plane of the battery cell, the buffering effect of the expansion force of the first buffer pad 21 and the second buffer pad during the use of the battery can be more consistent, thereby reducing the bending stress caused by the expansion of the battery cell.

[0148] refer to Figure 4 and Figure 5 In the above embodiments, the plurality of battery cells 10 may include at least one battery cell group, and the battery may include at least one battery module 41, corresponding to the at least one battery cell group. Each battery module 41 may include two end plates 31, a band 32 and a corresponding battery cell group, and the battery cells 10 in each battery cell group are arranged along a third direction x, and the third direction x is perpendicular to at least one of the relative surfaces 10f, 10f', and the buffer assembly 20 is bonded to the relative surfaces 10f, 10f'. The two end plates 31 are respectively located on both sides of the corresponding battery cell group along the third direction x. The band 32 is sleeved on the outer periphery of the two end plates 31 to clamp the two end plates 31 and the corresponding battery cell group.

[0149] The end plate 31 may be made of metal or alloy material, such as an aluminum alloy end plate, to reduce weight and increase strength. The band 32 may be made of metal, alloy or composite material, such as a steel band. The battery module 41 may use two bands 32 arranged at intervals along the first direction z, or may use one band 32 or more bands 32. A groove structure for the band 32 to be embedded in a partial depth may be provided on the end plate 31, so that the band 32 can stably and reliably fix the column end plate 31 and multiple battery cells 10, and is not easy to loosen from the battery module 41.

[0150] By providing two end plates on both sides of a plurality of battery cells in the battery module and tightening them with a hoop, the overall strength of the battery module can be improved and the risk of cracking of the battery module due to large expansion of the battery cells can be reduced.

[0151] refer to Figure 2In some embodiments, the battery 40 further includes a box 42 and a heat exchanger 43. The box 42 accommodates at least one battery module 41. The heat exchanger 43 is located in the box 42. The at least one battery module 41 is located on the upper side of the heat exchanger 43 and is connected to the heat exchanger 43 by a thermally conductive adhesive 44. For the connection between the heat exchanger 43 and the plurality of battery modules 41 by means of the thermally conductive adhesive 44, at least the buffer pad in the battery module can also block the amount of glue that the thermally conductive adhesive enters between the relative surfaces of two adjacent battery cells, thereby reducing the risk of glue occupying the space for expansion and deformation of the battery cells.

[0152] In some embodiments, the battery 40 further includes a housing 42 and a heat exchanger 43. The housing 42 accommodates the plurality of battery cells 10. The heat exchanger 43 is located in the housing 42. The plurality of battery cells 10 are located on the upper side of the heat exchanger 43 and are connected to the heat exchanger 43 by a thermally conductive adhesive 44. For the connection between the heat exchanger 43 and the plurality of battery cells 10 by the thermally conductive adhesive 44, the buffer pad can also block the amount of glue that the thermally conductive adhesive 44 enters between the relative surfaces of two adjacent battery cells 10, thereby reducing the risk of glue occupying the space for expansion and deformation of the battery cells.

[0153] Based on the above battery embodiments, refer to Figure 1 The embodiment of the present disclosure provides an electric device, comprising the battery 40 of any of the above embodiments. The electric device using the above battery is conducive to reducing costs.

[0154] In some specific embodiments, Figure 4-Figure 5 and Figure 8A-8C As shown, the battery 40 includes a plurality of battery modules 41. The battery module 41 includes: a plurality of battery cells 10, a buffer assembly 20, two end plates 31 and a band 32. The plurality of battery cells 10 are arranged along a third direction x. The buffer assembly 20 is located between the relative surfaces 10f and 10f' of two adjacent battery cells 10 among the plurality of battery cells 10. The buffer assembly 20 is bonded to the relative surfaces 10f and 10f'. The plurality of battery cells 10 are respectively located on both sides of the plurality of battery cells 10 along the third direction x. The band 32 is sleeved on the outer periphery of the two end plates 31 to clamp the two end plates 31 and the plurality of battery cells 10.

[0155] The buffer assembly 20 includes a first buffer pad 21 and a second buffer pad 22 arranged at intervals along a first direction z. The projection ranges of the first buffer pad 21 and the second buffer pad 22 in the first direction z do not overlap. The cross section of the first buffer pad 21 in the third direction x is U-shaped, and the U-shape has an opening vertically upward.

[0156] The second buffer pad 22 is the same as the first buffer pad 21 and is disposed opposite to the first buffer pad 21 in the first direction z. The second buffer pad 22 is located on a side of the first center plane CP1 of the battery cell 10 away from the first buffer pad 21 .

[0157] The buffer assembly 20 is symmetrical with respect to a first center plane CP1 passing through the battery cell 10, and is also symmetrical with respect to a second center plane CP2 passing through the battery cell 10. The first center plane CP1 is equidistant from the top surface 14 and the bottom surface 13 of the battery cell 10 along the first direction z, and the second center plane CP2 is equidistant from the first side surface 11 and the second side surface 12 of the battery cell along the second direction y.

[0158] Although the present disclosure has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery (40), comprising: A plurality of battery cells (10); and A buffer assembly (20) is located between opposite surfaces (10f; 10f') of two adjacent battery cells (10) among the plurality of battery cells (10). The buffer assembly (20) comprises at least two buffer pads, the at least two buffer pads are arranged at intervals along at least a first direction (z), and the projection ranges in the first direction (z) do not overlap, and the first direction (z) is parallel to at least one of the relative surfaces (10f; 10f').

2. The battery (40) according to claim 1, wherein: The first direction (z) is parallel to the height direction of the two adjacent battery cells (10), the at least two buffer pads include a first buffer pad (21), the first buffer pad (21) is the lowermost buffer pad among the at least two buffer pads, the first buffer pad (21) is continuous in the second direction (y), the second direction (y) is perpendicular to the first direction (z), and is parallel to at least one of the relative surfaces (10f; 10f').

3. The battery (40) according to claim 2, wherein: The first buffer pad (21) comprises a first buffer section (211), the first buffer section (211) having a first side edge (211e) adjacent to the bottom surface (13) of the battery cell (10) and parallel to the second direction (y).

4. The battery (40) according to claim 3, wherein: The first buffer pad (21) further comprises a second buffer segment (212) and a third buffer segment (213), both of which are connected to the first buffer segment (211) and extend in a direction away from the bottom surface (13) of the battery cell (10), and the second buffer segment (212) and the third buffer segment (213) are arranged at intervals along the second direction (y).

5. The battery (40) according to claim 4, wherein: The second buffer segment (212) and the third buffer segment (213) are respectively connected to two ends of the first buffer segment (211) along the second direction (y).

6. The battery (40) according to claim 4 or 5, wherein: The second buffer segment (212) has a second side edge (212e) adjacent to the first side edge (11) of the battery cell (10) and parallel to the first side edge (11); the third buffer segment (213) has a third side edge (213e) adjacent to the second side edge (12) of the battery cell (10) and parallel to the second side edge (12); the first side edge (11) and the second side edge (12) are both connected to the bottom surface (13) and are opposite to each other along the second direction (y).

7. The battery (40) according to any one of claims 2 to 6, wherein: The cross section of the first buffer pad (21) in the third direction (x) is U-shaped, the U-shape has an opening vertically upward, and the third direction (x) is perpendicular to both the first direction (z) and the second direction (y).

8. The battery (40) according to claim 7, wherein: A ratio h / w of a maximum dimension h of the first buffer pad (21) in the first direction (z) to a maximum dimension w of the first buffer pad (21) in the second direction (y) satisfies: 0.05≤h / w≤10.

9. The battery (40) according to claim 8, wherein: The ratio h / w satisfies: 0.1≤h / w≤5.

10. The battery (40) according to any one of claims 2 to 9, wherein: The at least two buffer pads further include a second buffer pad (22; 22'), the second buffer pad (22; 22') being located on a side of a first center plane (CP1) of the battery cell (10) away from the first buffer pad (21), the first center plane (CP1) being equidistant from a top surface (14) and a bottom surface (13) of the battery cell (10) along the first direction (z).

11. The battery (40) according to claim 10, wherein: The second buffer pad (22; 22') is the same as the first buffer pad (21), and is arranged opposite to the first buffer pad (21) in the first direction (z).

12. The battery (40) according to claim 10, wherein: The cross section of the second buffer pad (22; 22') in the third direction (x) is rectangular, and the third direction (x) is perpendicular to both the first direction (z) and the second direction (y).

13. The battery (40) according to claim 12, wherein: The first buffer pad (21) comprises a first buffer section (211), a second buffer section (212) and a third buffer section (213); the first buffer section (211) has a first side edge (211e) adjacent to the bottom surface (13) of the battery cell (10) and parallel to the second direction (y); the second buffer section (212) and the third buffer section (213) are both connected to the first buffer section (211) and extend in a direction away from the bottom surface (13) of the battery cell (10); the second buffer section (212) and the third buffer section (213) are connected to the first buffer section (211) and extend in a direction away from the bottom surface (13) of the battery cell (10); The third buffer sections (213) are arranged at intervals along the second direction (y); a maximum dimension d1 of a portion of the first buffer section (211) located between the second buffer section (212) and the third buffer section (213) in the first direction (z), a maximum dimension d2 of the second buffer section (212) in the second direction (y), and a maximum dimension d3 of the third buffer section (213) in the second direction (y) are all smaller than a maximum dimension d4 of the second buffer pad (22; 22') in the first direction (z).

14. The battery (40) according to any one of claims 10 to 13, wherein: The cross-sectional areas of the first buffer pad (21) and the second buffer pad (22; 22') in a third direction (x) are equal, and the third direction (x) is perpendicular to both the first direction (z) and the second direction (y).

15. The battery (40) according to any one of claims 1 to 14, wherein: The buffer assembly (20) is symmetrical with respect to a first center plane (CP1) passing through the battery cell (10), and the distances from the first center plane (CP1) to the top surface (14) and the bottom surface (13) of the battery cell (10) along the first direction (z) are equal; and / or, the buffer assembly (20) is symmetrical with respect to a second center plane (CP2) passing through the battery cell (10), and the distances from the second center plane (CP2) to the first side surface (11) and the second side surface (12) of the battery cell along the second direction (y) are equal, the second direction (y) is perpendicular to the first direction (z) and parallel to at least one of the relative surfaces (10f; 10f'), and the first side surface (11) and the second side surface (12) are relative to each other along the second direction (y).

16. The battery (40) according to any one of claims 1 to 15, wherein: The plurality of battery cells (10) include at least one battery cell group, the battery includes at least one battery module (41), corresponding to the at least one battery cell group one by one, each battery module (41) includes two end plates (31), a band (32) and a corresponding battery cell group, the battery cells (10) in each battery cell group are arranged along a third direction (x), the third direction (x) is perpendicular to at least one of the relative surfaces (10f; 10f'), the buffer assembly (20) is bonded to the relative surfaces (10f; 10f'), the two end plates (31) are respectively located on both sides of the corresponding battery cell group along the third direction (x), and the band (32) is sleeved on the outer periphery of the two end plates (31) to clamp the two end plates (31) and the corresponding battery cell group.

17. The battery (40) according to claim 16, further comprising: A box (42) for accommodating the at least one battery module (41); and A heat exchange element (43) is located in the box (42); Wherein, the at least one battery module (41) is located on the upper side of the heat exchange component (43), and is connected to the heat exchange component (43) via a heat conductive adhesive (44).

18. The battery (40) according to any one of claims 1 to 15, further comprising: A box (42) for accommodating the plurality of battery cells (10); and A heat exchange element (43) is located in the box (42); The plurality of battery cells (10) are located on the upper side of the heat exchange component (43) and are connected to the heat exchange component (43) via a heat conductive adhesive (44).

19. An electrical device, comprising: The battery (40) according to any one of claims 1 to 18.

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