Batteries and electrical devices

Abstract

A battery and an electrical device are disclosed. The battery includes a housing and a battery cell. The housing has a receiving cavity, which includes a top wall and a bottom wall that are vertically opposite to each other. The battery cell is disposed in the receiving cavity and includes an electrode assembly and an electrode terminal. The electrode assembly and the electrode terminal are electrically connected. The battery cell is fixed in the receiving cavity, and the electrode terminal is disposed facing the bottom wall of the receiving cavity.

Description

[0001] Cross-references to related applications

[0002] This application is based on international patent applications PCT / CN2022 / 098355 and PCT / CN2022 / 077998 and PCT / CN2022 / 098380, both filed on June 13, 2022. 343. International patent applications filed on June 13, 2022, application number PCT / CN2022 / 098348, PCT / CN2022 / 098373, PCT / CN2022 / 098370, and PCT / CN2022 / 098370. International patent applications, application numbers PCT / CN2022 / 077993 and PCT / CN2022 / 101440 and PCT / CN2022 / 101406, and PCT / CN2022 / 1014, are filed on February 25, 2022. 14. International patent applications filed on June 27, 2022, with application numbers PCT / CN2022 / 101517, PCT / CN2022 / 101393, and PCT / CN2022 / 101393, are hereby filed and claim priority to the aforementioned international patent applications, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to battery technology, and more particularly to a battery and an electrical device. Background Technology

[0004] In recent years, the emergence of new energy vehicles has played a huge role in promoting social development and environmental protection. As a rechargeable battery, the power source of new energy vehicles is widely used in the field of new energy vehicles.

[0005] In some cases, the low energy density of batteries leads to wasted space, which in turn affects the performance of electrical devices. Furthermore, existing batteries have poor rigidity and cannot directly withstand the loads from other parts of the electrical device, which can easily cause safety accidents and affect the safety of the electrical device. Summary of the Invention

[0006] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a battery that can improve the energy density and safety of the battery.

[0007] This application also proposes an electrical device having the aforementioned battery.

[0008] A battery according to a first aspect of this application includes: a housing having a receiving cavity, the receiving cavity including a top wall and a bottom wall disposed opposite each other in a vertical direction; a battery cell disposed within the receiving cavity, the battery cell including an electrode assembly and an electrode terminal, the electrode assembly being electrically connected to the electrode terminal, the battery cell being fixed within the receiving cavity, and the electrode terminal being disposed facing the bottom wall of the receiving cavity.

[0009] In the above technical solution, the battery cells are placed inside the casing with the electrode terminals facing the bottom wall, which can improve the safety of the battery.

[0010] In some embodiments, the battery cell has a first wall and a second wall connected together, the first wall being the wall with the largest area in the battery cell, and the second wall and the first wall being intersected.

[0011] In some embodiments, the electrode terminals are disposed on the first wall.

[0012] In some embodiments, there are multiple battery cells arranged in a first direction. In the first direction, each battery cell has a first surface disposed opposite to the first wall. The first surface has a clearance groove. The clearance groove of one of two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell. The first direction is perpendicular to the first wall.

[0013] In some embodiments, the electrode terminals are disposed on the second wall.

[0014] In some embodiments, the battery cell includes two first walls and two second walls disposed opposite to each other, and the electrode terminals are configured to be at least two; at least two of the electrode terminals are disposed on the same second wall; or, each second wall is provided with at least one of the electrode terminals.

[0015] In some embodiments, the first wall is formed in a cylindrical shape.

[0016] In some embodiments, the first wall has a second wall at both axial ends, and at least one of the second walls has the electrode terminal.

[0017] In some embodiments, one of the second walls has an exposed electrode terminal, the electrode assembly includes a positive electrode and a negative electrode, one of the positive electrode and the negative electrode is electrically connected to the electrode terminal, and the other of the positive electrode and the negative electrode is electrically connected to the first wall or the other second wall.

[0018] In some embodiments, at least one of the battery cells is a pouch cell.

[0019] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on the same wall as the electrode terminals of the battery cell.

[0020] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on two walls of the battery cell, respectively, along with the electrode terminals.

[0021] In some embodiments, the housing includes a main body and a bottom cover disposed at the bottom of the main body, the bottom cover being sealed to the main body and together forming the closed receiving cavity.

[0022] In some embodiments, the wall of the bottom cover facing the battery cell forms the bottom wall of the receiving cavity.

[0023] In some embodiments, the bottom cover is detachably attached to the bottom of the body.

[0024] In some embodiments, the bottom cover has a feature surface facing the receiving cavity, the feature surface being configured as a plane.

[0025] In some embodiments, a support member is provided on the top of the housing, and the battery cell is disposed on the surface of the support member.

[0026] In some embodiments, the wall of the carrier facing the battery cell forms the top wall of the receiving cavity.

[0027] In some embodiments, the minimum thickness H of the support member and the weight M1 of the battery satisfy the following condition: 0.0002 mm / kg < H / M1 ≤ 0.2 mm / kg.

[0028] In some embodiments, the carrier is used to define the receiving cavity, and the battery cell is suspended from the carrier.

[0029] In some embodiments, the battery cell is bonded to the carrier.

[0030] In some embodiments, the outer surface of the battery cell facing the carrier is a first outer surface, and the electrode terminals are arranged on the outer surface of the battery cell other than the first outer surface.

[0031] In some embodiments, the battery cell has a second outer surface disposed opposite to the first outer surface, and the electrode terminals are disposed on the second outer surface.

[0032] In some embodiments, there are multiple battery cells, which are arranged in a second direction perpendicular to the vertical direction; the support member is connected to the top wall of the multiple battery cells, and the battery cells are located below the support member. The relationship between the dimension N of the support member in the vertical direction and the weight M2 of the battery cells satisfies: 0.04mm / kg≤N / M2≤100mm / kg.

[0033] In some embodiments, the carrier has a cavity inside.

[0034] In some embodiments, the cavity is used to contain a heat exchange medium to regulate the temperature of the battery cell.

[0035] In some embodiments, in the vertical direction, the surface of the support member away from the battery cell is provided with reinforcing ribs.

[0036] In some embodiments, the carrier has a bearing surface facing the receiving cavity, the bearing surface being configured as a plane.

[0037] In some embodiments, the carrier has a supporting portion and a connecting portion, the connecting portion surrounding and connecting to the edge of the supporting portion, the supporting portion defining the receiving cavity, and the connecting portion connecting to the portion of the housing other than the carrier; wherein the supporting portion is configured to form the supporting surface on the inner surface facing the receiving cavity.

[0038] In some embodiments, the support portion protrudes from the connecting portion in a direction away from the receiving cavity.

[0039] In some embodiments, the housing includes a bottom cover and a frame, the frame enclosing a space that extends through both ends in the vertical direction, the bottom cover and the support member respectively covering opposite ends of the enclosing space in the vertical direction, and the bottom cover, the frame and the support member together enclosing the receiving cavity.

[0040] In some embodiments, the battery cell is placed upside down in the housing with its end cap facing the bottom wall. The end cap is provided with a pressure relief mechanism and the electrode terminals, both of which are positioned facing the bottom wall.

[0041] In some embodiments, the battery further includes a connecting plate and a connector. The connecting plate is disposed on one side of the housing and protrudes horizontally. The connecting plate and the bottom wall form a receiving portion in the vertical direction. The connector is disposed in the receiving portion and connected to the connecting plate. The connector is electrically connected to the battery cell.

[0042] In some embodiments, the battery further includes a protective component disposed between the battery cell and the bottom wall to support the battery cell.

[0043] In some embodiments, the battery further includes a busbar for electrically connecting to the electrode terminals of at least two of the battery cells, and a protective assembly disposed between the bottom wall and the busbar for insulating the battery cells from the bottom wall.

[0044] In some embodiments, the protective component includes a protective strip that abuts against the battery cell.

[0045] In some embodiments, the protective strip is fixedly connected to the battery cell and / or the housing.

[0046] In some embodiments, the protective strip is bonded to the battery cell and / or the housing.

[0047] In some embodiments, multiple protective strips are provided, and the multiple protective strips are spaced apart in a second direction and extend along a first direction, wherein the first direction and the second direction are perpendicular to the vertical direction.

[0048] In some embodiments, the protective component further includes a motherboard, the protective strip is connected to the motherboard, and the motherboard is located between the protective strip and the bottom wall.

[0049] In some embodiments, the motherboard abuts against the bottom wall.

[0050] In some embodiments, the motherboard is fixedly connected to the bottom wall.

[0051] In some embodiments, the motherboard and the protective strip are integrally formed or detachably connected.

[0052] In some embodiments, the end cap of the battery cell includes a functional area and a shoulder, the functional area being provided with the electrode terminals, the shoulder being located on both sides of the functional area along a second direction, and the battery cell abutting against the protective strip through the shoulder, the second direction being perpendicular to the vertical direction.

[0053] In some embodiments, in the vertical direction, the thickness of the protective strip is greater than the extension height of the portion of the electrode terminal exposed in the battery cell.

[0054] In some embodiments, the protective strip abuts against the electrode terminal, or the protective strip is spaced apart from the electrode terminal.

[0055] In some embodiments, the orthographic projection of the electrode terminal on the bottom wall lies between the orthographic projections of the adjacent protective strip on the bottom wall.

[0056] In some embodiments, the electrode terminals of two adjacent battery cells are electrically connected by a busbar, and in the first direction, the extension length of one of the two adjacent protective strips is less than the extension length of the other to form a clearance notch, which is used to avoid the busbar.

[0057] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on the same side as the electrode terminal, and the orthographic projection of the pressure relief mechanism on the bottom wall is located between the orthographic projections of the adjacent protective strip on the bottom wall.

[0058] In some embodiments, in the vertical direction, there is a first distance H1 between the end cap and the bottom wall of the battery cell, wherein the first distance H1 satisfies 2mm < H1 < 30mm.

[0059] In some embodiments, the ratio of the first distance H1 to the weight M2 of a single battery cell, H1 / M2, satisfies 0.2 mm / Kg < H1 / M2 < 50 mm / Kg.

[0060] In some embodiments, the battery cell further includes a battery case, the electrode assembly is housed within the battery case, and the battery case is provided with a pressure relief mechanism, which is integrally formed with the battery case.

[0061] In some embodiments, the battery case includes an integrally formed non-weak region and a weak region, the battery case is provided with a groove, the non-weak region is formed around the groove, the weak region is formed at the bottom of the groove, the weak region is configured to be destroyed when the internal pressure of the battery cell is released, and the pressure relief mechanism includes the weak region.

[0062] In some embodiments, the average grain size of the weak region is S1, and the average grain size of the non-weak region is S2, satisfying: 0.05≤S1 / S2≤0.9.

[0063] In some embodiments, the minimum thickness of the weak region is A1, which satisfies: 1≤A1 / S1≤100.

[0064] In some embodiments, the minimum thickness of the weak region is A1, and the hardness of the weak region is B1, satisfying: 5HBW / mm≤B1 / A1≤10000HBW / mm.

[0065] In some embodiments, the hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1 < B1 / B2 ≤ 5.

[0066] In some embodiments, the minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05≤A1 / A2≤0.95.

[0067] In some embodiments, the electrode assembly includes a positive electrode and a negative electrode, the positive electrode and / or the negative electrode including a current collector and an active material layer, the current collector including a support layer and a conductive layer, the support layer for supporting the conductive layer, and the conductive layer for supporting the active material layer.

[0068] In some embodiments, the conductive layer is disposed on at least one side of the support layer along the thickness direction of the support layer.

[0069] In some embodiments, the room-temperature thin-film resistance R of the conductive layer S Satisfies: 0.016Ω / □≤R S ≤420Ω / □.

[0070] In some embodiments, the material of the conductive layer is selected from at least one of aluminum, copper, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

[0071] In some embodiments, the material of the support layer includes one or more of polymeric materials and polymer-based composite materials.

[0072] In some embodiments, the thickness d1 of the support layer and the light transmittance k of the support layer satisfy the following conditions: when 12μm≤d1≤30μm, 30%≤k≤80%; or when 8μm≤d1<12μm, 40%≤k≤90%; or when 1μm≤d1<8μm, 50%≤k≤98%.

[0073] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has a core and a shell coating the core, the core includes at least one of ternary material, dLi2MnO3·(1 - d)LiMO2 and LiMPO4, 0 < d < 1, M includes one or more selected from Fe, Ni, Co, Mn, the shell contains crystalline inorganic substances, the full width at half maximum of the main peak measured by X-ray diffraction of the crystalline inorganic substances is 0 - 3°, and the crystalline inorganic substances include one or more selected from metal oxides and inorganic salts.

[0074] In some embodiments, the shell includes at least one of the metal oxide and the inorganic salt, and carbon.

[0075] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has LiMPO4, M includes Mn, and a non-Mn element, and the non-Mn element satisfies at least one of the following conditions: the ionic radius of the non-Mn element is a, the ionic radius of manganese element is b, |a - b| / b is not greater than 10%; the valence variable voltage of the non-Mn element is U, 2V < U < 5.5V; the chemical activity of the chemical bond formed by the non-Mn element and O is not less than the chemical activity of the P - O bond; the highest valence of the non-Mn element is not greater than 6.

[0076] In some embodiments, the non-Mn element includes one or both of a first doping element and a second doping element, the first doping element is a manganese-site doping, and the second doping element is a phosphorus-site doping.

[0077] In some embodiments, the first doping element satisfies at least one of the following conditions: the ionic radius of the first doping element is a, the ionic radius of manganese element is b, |a - b| / b is not greater than 10%; the valence variable voltage of the first doping element is U, 2V < U < 5.5V.

[0078] In some embodiments, the second doping element satisfies at least one of the following conditions: the chemical activity of the chemical bond formed by the second doping element and O is not less than the chemical activity of the P - O bond; the highest valence of the second doping element is not greater than 6.

[0079] In some embodiments, the positive electrode active material further has a coating layer.

[0080] In some embodiments, the coating layer includes carbon.

[0081] In some embodiments, the carbon in the coating layer is a mixture of SP2-form carbon and SP3-form carbon.

[0082] In some embodiments, the molar ratio of SP2 carbon to SP3 carbon is any value in the range of 0.1-10.

[0083] An electrical device according to a second aspect of this application includes a battery according to the first aspect of this application described above, the battery being used to provide electrical energy.

[0084] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0085] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0086] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of this application;

[0087] Figure 2 This is an exploded view of a battery according to an embodiment of this application;

[0088] Figure 3 This is an exploded view of a battery according to another embodiment of this application;

[0089] Figure 4 This is an exploded view of a battery cell according to an embodiment of this application;

[0090] Figure 5 yes Figure 4 A schematic diagram of the battery cell shown;

[0091] Figure 6 This is a schematic diagram of the arrangement of battery cells according to another embodiment of this application;

[0092] Figure 7 This is an exploded view of a battery according to an embodiment of this application;

[0093] Figure 8 yes Figure 7 The diagram shows the arrangement of the individual battery cells.

[0094] Figure 9 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0095] Figure 10 This is a schematic diagram of the battery structure provided in some embodiments of this application;

[0096] Figure 11 for Figure 10 An exploded view of the battery shown;

[0097] Figure 12 This is a schematic diagram of the structure of the bottom cover provided in some embodiments of this application;

[0098] Figure 13 for Figure 12 Top view of the bottom cover;

[0099] Figure 14 for Figure 12 The front view of the bottom cover is shown;

[0100] Figure 15 This is a schematic diagram of the structure of the bottom cover provided in some other embodiments of this application;

[0101] Figure 16 for Figure 10 A cross-sectional view of the battery shown;

[0102] Figure 17 for Figure 14 The diagram shows the orthographic projection of the bottom cover in the vertical direction;

[0103] Figure 18 This is a schematic diagram of the external shape of a single battery cell in some embodiments of this application;

[0104] Figure 19 for Figure 18 The front view of the battery cell shown;

[0105] Figure 20 This is a schematic diagram of the structure of the carrier in some embodiments of this application;

[0106] Figure 21 This is a schematic diagram of the structure of the carrier in some other embodiments of this application;

[0107] Figure 22 for Figure 21 The above is a vertical orthographic projection of the support component.

[0108] Figure 23 for Figure 10 The front view of the battery shown;

[0109] Figure 24 This is a schematic diagram illustrating the application of a battery in a vehicle body in some embodiments of this application;

[0110] Figure 25 yes Figure 24 A schematic diagram of the battery shown;

[0111] Figure 26 for Figure 24The first decomposed state diagram of the structure shown;

[0112] Figure 27 for Figure 24 The second decomposition state diagram of the structure shown;

[0113] Figure 28 Schematic diagrams illustrating the installation relationship between the battery and the vehicle body in some embodiments of this application;

[0114] Figure 29 A schematic diagram of a battery provided for some embodiments of this application;

[0115] Figure 30 This is a schematic diagram of the structure of the carrier component in some embodiments of this application;

[0116] Figure 31 This is a schematic diagram of the structure of the carrier component in some embodiments of this application;

[0117] Figure 32 This is a schematic diagram of the structure of the carrier component in some embodiments of this application;

[0118] Figure 33 This is a schematic diagram of the structure of the carrier component in some embodiments of this application;

[0119] Figure 34 This is a schematic diagram of the structure of the carrier component in some embodiments of this application;

[0120] Figure 35 These are schematic diagrams of the battery structure according to some embodiments of this application;

[0121] Figure 36 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0122] Figure 37 for Figure 36 A schematic diagram of the battery module shown;

[0123] Figure 38 This is a schematic diagram showing the cooperation between a battery cell and a reinforcing member in some embodiments of this application;

[0124] Figure 39 This is a schematic diagram showing the cooperation between a battery cell and a reinforcing member in some embodiments of this application;

[0125] Figure 40 This is a schematic diagram showing the cooperation between a battery cell and a reinforcing member in some embodiments of this application;

[0126] Figure 41 Exploded views of batteries from some embodiments of this application;

[0127] Figure 42 for Figure 41 A schematic diagram of the protective components for the battery shown;

[0128] Figure 43 for Figure 41 A cross-sectional view of the battery shown.

[0129] Figure 44 for Figure 43 Enlarged view of point B in the circle;

[0130] Figure 45 This is a schematic diagram of the structure of a collision testing apparatus A for performing collision testing on a battery according to some embodiments of this application;

[0131] Figure 46 This is a schematic diagram showing the arrangement of electrode terminals in some embodiments of this application;

[0132] Figure 47 This is a schematic diagram showing the cooperation between a battery cell and a reinforcing member in some embodiments of this application;

[0133] Figure 48 Schematic diagrams of the casing provided for some embodiments of this application;

[0134] Figure 49 for Figure 48 The shown is a CC cross-sectional view of the casing;

[0135] Figure 50 for Figure 49 The grain diagram of the shell shown is a schematic diagram.

[0136] Figure 51 for Figure 49 A magnified view of a portion of the outer casing at point E;

[0137] Figure 52 Enlarged partial views of the casing provided for other embodiments of this application;

[0138] Figure 53 A schematic diagram of the structure of the housing provided for some embodiments of this application (showing the primary groove);

[0139] Figure 54 for Figure 53 The EE cross-sectional view of the casing shown;

[0140] Figure 55 A schematic diagram of the housing structure provided for some embodiments of this application (showing primary grooves);

[0141] Figure 56 for Figure 55 The FF cross-sectional view of the casing shown;

[0142] Figure 57 A schematic diagram of the housing structure provided for other embodiments of this application (showing primary grooves);

[0143] Figure 58 for Figure 57 The GG cross-sectional view of the casing shown;

[0144] Figure 59 A schematic diagram of the structure of the housing provided for some embodiments of this application (showing two levels of grooves);

[0145] Figure 60 for Figure 59 The KK cross-sectional view of the casing shown;

[0146] Figure 61 A schematic diagram of the housing structure provided for some embodiments of this application (showing two levels of grooves);

[0147] Figure 62 for Figure 61 The MM cross-sectional view of the casing shown;

[0148] Figure 63 A schematic diagram of the housing structure provided for other embodiments of this application (showing two levels of grooves);

[0149] Figure 64 for Figure 63 The NN cross-sectional view of the outer casing shown;

[0150] Figure 65 Axonometric views of the housing provided for some embodiments of this application;

[0151] Figure 66 for Figure 65 The schematic diagram of the outer casing shown (showing the primary groove and the primary countersink);

[0152] Figure 67 for Figure 66 The shown is an OO cross-sectional view of the outer casing;

[0153] Figure 68 A schematic diagram of the housing structure provided for some embodiments of this application (showing primary grooves and primary countersinks);

[0154] Figure 69 for Figure 68 The PP cross-sectional view of the casing shown;

[0155] Figure 70 A schematic diagram of the housing structure provided for other embodiments of this application (showing primary grooves and primary countersinks);

[0156] Figure 71 for Figure 70 The QQ cross-sectional view of the outer casing component shown;

[0157] Figure 72A schematic diagram of the housing structure provided for some embodiments of this application (showing a primary groove and a two-stage countersink);

[0158] Figure 73 for Figure 72 The RR sectional view of the housing component shown;

[0159] Figure 74 A schematic diagram of the housing structure provided for some embodiments of this application (showing a primary groove and a two-stage countersink);

[0160] Figure 75 for Figure 74 The SS cross-sectional view of the casing shown;

[0161] Figure 76 A schematic diagram of the structure of a housing component provided for other embodiments of this application (showing a primary groove and a two-stage countersink);

[0162] Figure 77 for Figure 76 The TT cross-sectional view of the casing shown;

[0163] Figure 78 Schematic diagrams of the casing provided for other embodiments of this application;

[0164] Figure 79 Grain diagrams (schematic diagrams) of the casing provided for other embodiments of this application;

[0165] Figure 80 This is a schematic diagram of the end cap structure provided in some embodiments of this application;

[0166] Figure 81 Schematic diagrams of the housing structure provided for some embodiments of this application;

[0167] Figure 82 Schematic diagrams of the housing structure provided for other embodiments of this application;

[0168] Figure 83 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0169] Figure 84 This is a schematic diagram of the positive electrode current collector according to a specific embodiment of this application;

[0170] Figure 85 This is a schematic diagram of the positive electrode current collector according to another specific embodiment of this application;

[0171] Figure 86 This is a schematic diagram of the negative electrode current collector according to a specific embodiment of this application;

[0172] Figure 87This is a schematic diagram of the negative electrode current collector according to another specific embodiment of this application;

[0173] Figure 88 This is a schematic diagram of the structure of a positive electrode sheet according to a specific embodiment of this application;

[0174] Figure 89 This is a schematic diagram of the structure of a positive electrode sheet according to another specific embodiment of this application;

[0175] Figure 90 This is a schematic diagram of the structure of a negative electrode sheet according to a specific embodiment of this application;

[0176] Figure 91 This is a schematic diagram of the structure of a negative electrode sheet according to another specific embodiment of this application;

[0177] Figure 92 This is a schematic diagram of a single nail penetration test in this application;

[0178] Figure 93 The temperature change curves of lithium-ion battery #1 and lithium-ion battery #4 after a nail penetration test are shown.

[0179] Figure 94 The voltage change curves of lithium-ion battery #1 and lithium-ion battery #4 after a nail penetration test are shown.

[0180] Figure 95 X-ray diffraction (XRD) patterns of undoped LiMnPO4 and the positive electrode active material prepared in Example 2;

[0181] Figure 96 The image shows the X-ray energy dispersive spectroscopy (EDS) spectrum of the positive electrode active material prepared in Example 2.

[0182] Figure 97 This is a schematic diagram of the positive electrode active material with a core-shell structure described in this application;

[0183] Figure 98 This is a schematic diagram of a core-shell structured positive electrode active material according to an embodiment of this application. Detailed Implementation

[0184] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0185] In the description of this application, it should be noted that, unless otherwise stated, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion; "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0186] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0187] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0188] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Unless otherwise specified, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B"; more specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); or A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0189] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0190] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. Ranges defined in this way may or may not include endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. Any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of the range is included within that range. Therefore, each point or individual value can be combined as its own lower or upper limit with any other point or individual value or with other lower or upper limits to form an unspecified range.

[0191] For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is understood that ranges of 60-110 and 80-120 are also expected. Furthermore, if the minimum range values ​​are listed as 1 and 2, and the maximum range values ​​are listed as 3, 4, and 5, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range “ab” represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range “0-5” means that all real numbers between “0-5” have been listed herein; “0-5” is merely a shortened representation of these numerical combinations. Additionally, when a parameter is stated as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. In this application, “about” a numerical value represents a range, indicating a range of ±10% of that value.

[0192] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Unless otherwise specified, all steps of this application can be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0193] It should be noted that, in this document, the terms "coating layer" and "coating" refer to a material layer coating a core material such as lithium manganese phosphate. This material layer may completely or partially coat the core. The use of "coating layer" is for ease of description only and is not intended to limit this application. Furthermore, each coating layer may be a complete or partial coating. Similarly, the term "coating layer thickness" refers to the thickness of the material layer coating the core in the radial direction of the core.

[0194] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0195] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery pack, etc. A battery generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0196] The housing 10 may include a first part 101 and a second part 102 (e.g., Figure 2 and Figure 3As shown, the first part 101 and the second part 102 overlap each other, and together they define a receiving cavity 10a for accommodating the battery cell 20. The second part 102 can be a hollow structure with one open end, and the first part 101 is a plate-like structure. The first part 101 covers the open side of the second part 102 to form a box with the receiving cavity 10a. Alternatively, both the first part 101 and the second part 102 can be hollow structures with one open side, and the open side of the first part 101 covers the open side of the second part 102 to form a box with the receiving cavity 10a. Of course, the box 10 can be of various shapes, such as a cylinder, a cuboid, etc.

[0197] To improve the sealing performance after the first part 101 and the second part 102 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first part 101 and the second part 102.

[0198] The material of the enclosure 10 can be alloy materials such as aluminum alloy or iron alloy, polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0199] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0200] There are no particular limitations on the aforementioned separator membrane; any known porous structure separator membrane with electrochemical and chemical stability can be selected, such as a single-layer or multi-layer film of one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The material of the separator membrane can be polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0201] The electrolyte comprises an organic solvent and an electrolyte salt, wherein the electrolyte salt acts as a transporter of ions between the positive and negative electrodes, and the organic solvent serves as a medium for ion transport. The electrolyte salt can be one or more of the electrolyte salts known in the art for use in battery cells, such as LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoroarsenate), LiFSI (lithium bis(fluorosulfonyl)imide), LiTFSI (lithium bis(trifluoromethanesulfonyl)imide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorooxalate borate), LiBOB (lithium dioxalate borate), LiPO2F2 (lithium difluorophosphate), LiDFOP (lithium difluorodioxalate phosphate), and LiTFOP (lithium tetrafluorooxalate phosphate). The organic solvent can be an organic solvent known in the art for use in battery cells, such as ethylene carbonate (EC) and propylene carbonate. The electrolyte may be selected from one or more of the following: ester (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butenyl carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE), preferably two or more. Appropriate electrolyte salts and organic solvents may be selected according to actual needs.

[0202] Of course, a single battery cell may not necessarily include electrolyte.

[0203] To meet diverse power demands, a battery can comprise multiple individual cells, which can be connected in series, parallel, or a combination of both. Optionally, multiple individual cells can first be connected in series, parallel, or a combination of both to form a battery module, and then these battery modules can be connected in series, parallel, or a combination of both to form a battery. In other words, multiple individual cells can directly form a battery, or they can first be assembled into battery modules or battery packs, and then these modules or packs can be combined to form a battery. The battery is then further installed in the electrical device to provide power to it.

[0204] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0205] In related technologies, the opening of the battery box is usually facing upwards in the vertical direction, the battery cells are fixed to the bottom of the battery box, and the electrode terminals face the cover that covers the opening of the box.

[0206] However, in the battery configuration described above, the applicant noted that, since the individual battery cells are fixed to the bottom of the battery casing when the battery is installed in the electrical device, the top of the battery casing, which is more susceptible to impact, has poor rigidity. Furthermore, during a collision, the individual battery cells inside the battery experience uneven stress, making the battery prone to damage, resulting in poor battery safety and affecting battery performance.

[0207] In view of this, this application provides a technical solution in which a battery cell is housed within a housing cavity of a casing and fixed within the cavity, with the electrode terminals of the battery cell facing the bottom wall of the cavity. This effectively improves battery safety.

[0208] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0209] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0210] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may contain a motor 101, a controller 102, and a battery 100. The controller 102 controls the battery 100 to supply power to the motor 101. For example, the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0211] To meet different power demands, battery 100 may include one or more individual battery cells 20. For example, such as Figure 2 and Figure 3 The diagram shown is a structural schematic of a battery 100 according to an embodiment of this application. The battery 100 may include multiple battery cells 20. The battery 100 may also include a housing 10, which has a hollow interior, and the multiple battery cells 20 are housed within the housing 10. For example, the multiple battery cells 20 may be connected in parallel, series, or a combination thereof and then placed inside the housing 10.

[0212] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0213] Depending on different power demands, the number of battery cells 20 can be set to any value; for example, a single battery cell 20 can be used. Multiple battery cells 20 can be connected in series, parallel, or a combination thereof to achieve a larger capacity or power. Since each battery 100 may contain a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements. A battery can include multiple battery modules, which can be connected in series, parallel, or a combination thereof.

[0214] like Figure 4 The diagram shown is a structural schematic of a battery cell 20 according to an embodiment of this application. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and an end cap 212. The housing 211 and the end cap 212 form the outer shell or battery box 21 of the battery cell 20. The walls of the housing 211 and the end cap 212 are both referred to as the walls of the battery cell 20. For a cuboid battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 depends on the shape of the combined one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one side of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open surface, that is, this plane does not have a wall, allowing communication between the inside and outside of the housing 211. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is an open face, that is, the end face does not have a wall, allowing the inside and outside of the housing 211 to communicate. The end cap 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution; the material of the housing 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0215] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the end cap 212. The end cap 212 is typically flat, and the two electrode terminals 214 are fixed to the flat surface of the end cap 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 23, or a current collector, which is located between the end cap 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0216] like Figure 4As shown, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 222a is a negative tab. The first tab 221a of one or more electrode assemblies 22 is connected to an electrode terminal via a connecting member 23, and the second tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive tab via a connecting member 23, and the negative electrode terminal 214b is connected to the negative tab via another connecting member 23.

[0217] In this battery cell 20, depending on actual usage requirements, the electrode assembly 22 can be configured as a single unit or multiple units, such as... Figure 4 As shown, the battery cell 20 contains four independent electrode assemblies 22.

[0218] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold. Specifically, the pressure relief mechanism 213 refers to a component or part that actuates to release internal pressure when the internal pressure of the battery cell 20 reaches a predetermined threshold. That is, when the internal pressure of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 213 is activated or turned to a certain state, thereby releasing the internal pressure of the battery cell 20. The action of the pressure relief mechanism 213 may include, but is not limited to: at least a part of the pressure relief mechanism 213 ruptures, breaks, tears, or opens, thereby forming an opening or channel for internal pressure release. At this time, the high-temperature and high-pressure substances inside the battery cell 20 are discharged outward from the actuated part as exhaust material. In this way, the battery cell 20 can be depressurized under controllable pressure, thereby avoiding potentially more serious accidents. The pressure relief mechanism 213 can take the form of an explosion-proof valve, a gas valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive element or structure.

[0219] For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0220] Figure 10 and Figure 11 A schematic diagram of the structure of a battery 100 according to an embodiment of this application is shown.

[0221] The battery 100 includes a housing 10 and a battery cell 20. The housing 10 has a receiving cavity 10a. The receiving cavity 10a includes a top wall 101 and a bottom wall 102 arranged opposite each other in the vertical direction z. The top wall 101 and the bottom wall 102 are arranged sequentially from top to bottom in the vertical direction. The battery cell 20 is disposed in the receiving cavity 10a. The battery cell 20 includes an electrode assembly 22 and an electrode terminal 214. The electrode assembly 22 and the electrode terminal 214 are electrically connected so that the battery cell 20 can be used to provide electrical energy.

[0222] The battery cell 20 is fixed inside the receiving cavity 10a, and the electrode terminal 214 is positioned facing the bottom wall 102 of the receiving cavity 10a, which facilitates providing a larger electrical connection space for the electrode terminal 214, thereby improving the energy density of the battery 100 and enhancing its availability and safety.

[0223] For example, fixing the battery cell 20 to the top inside the housing 10 can increase the rigidity of the top of the battery 100, thereby further increasing the safety of the battery 100.

[0224] For ease of description, in this embodiment, the vertical direction is used as the up-down direction. It should be understood that the vertical direction of the battery 100 can also be other directions when in use, and no specific limitation is made here.

[0225] In some embodiments, such as Figure 5 As shown, the battery cell 20 has a first wall 201 and a second wall 202 connected to each other. The first wall 201 is the wall with the largest area in the battery cell, and the second wall 202 is intersecting with the first wall 201. Therefore, the first wall 201 and the second wall 202 are not parallel, and the first wall 201 and the second wall 202 have a common line.

[0226] Optionally, the battery cell 20 is generally formed into a cuboid structure, and the length of the battery cell 20 is greater than the width and height of the battery cell 20. The first wall 201 is located on one side of the battery cell 20 in the first direction x, and at least one side of the battery cell 20 in the second direction y has a second wall 202. At least one side of the battery cell 20 in the vertical direction z has a second wall 202. The electrode terminal 214 can be disposed on the second wall 202 in the vertical direction z of the battery cell 20; of course, as Figure 6 As shown, electrode terminals 214 can also be disposed on the second wall 202 of the battery cell 20 in the second direction y.

[0227] The electrode terminal 214 is disposed on the second wall 202. The electrode terminal 214 is disposed on the wall of the battery cell 20 other than the first wall 201 and intersecting with the first wall 201, so as to facilitate the placement of the electrode terminal 214. At the same time, it is convenient to achieve the avoidance between the electrode terminal 214 and the reinforcing member 30 (described below), so that the reinforcing member 30 does not need to be provided with an avoidance part to avoid the electrode terminal 214, which helps to simplify the structure of the reinforcing member 30.

[0228] Optionally, in Figure 6 In the example, the battery cell 20 can be a blade battery, the length of the battery cell 20 is greater than the width of the battery cell 20 and the height of the battery cell 20, the length of the battery cell 20 in the second direction y is greater than the width of the battery cell 20 in the vertical direction z and the height of the battery cell 20 in the first direction x, the first wall 201 is located at one end in the height direction of the battery cell 20, and the electrode terminal 214 is located on the second wall 202. Then the electrode terminal 214 can be located at one or both ends in the length direction of the battery cell 20, and / or the electrode terminal 214 is located at one or both ends in the width direction of the battery cell 20.

[0229] Of course, the location of the electrode terminal 214 is not limited to this in this application. Figure 7 and Figure 8 As shown, the electrode terminal 214 can also be disposed on the first wall 201, which also facilitates the arrangement of the electrode terminal 214; for example, the battery cell 20 is a one-stop battery cell. It can be seen that the battery 100 in this embodiment has good flexibility in the placement of the electrode terminal 214.

[0230] In some embodiments, such as Figure 8 As shown, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in a first direction x. In the first direction x, each battery cell 20 has a first surface 203 that is disposed opposite to the first wall 201. The first surface 203 has a clearance groove 203a. The clearance groove 203a of one of two adjacent battery cells 20 is used to accommodate the electrode terminal 214 of the other battery cell 20. The first direction x is perpendicular to the first wall 201, so as to realize the compact arrangement of multiple battery cells 20 in the first direction and save space.

[0231] In some embodiments, such as Figures 4-6 As shown, electrode terminals 214 are disposed on the second wall 202. The battery cell 20 includes two first walls 201 and two second walls 202 disposed opposite to each other. The electrode terminals 214 are configured to be at least two, and the plurality of electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0232] In this configuration, at least two electrode terminals 214 are disposed on the same second wall 202, which helps to save space occupied by the battery cell 20 while ensuring that adjacent electrode terminals 214 have a suitable spacing; or, each second wall 202 is provided with at least one electrode terminal 214, so that the electrode terminals 214 located on different second walls 202 have sufficient spacing.

[0233] For example, in Figure 4 and Figure 5 In the example, the battery cell 20 includes two first walls 201 disposed opposite each other along the first direction x and two second walls 202 disposed opposite each other along the vertical direction z. The vertical direction z is not parallel to the first direction x, for example, the vertical direction z is perpendicular to the first direction x. The plurality of electrode terminals 214 are all located on the same second wall 202 of the battery cell 20 in the vertical direction z.

[0234] In some embodiments, electrode terminals 214 are disposed on the second wall 202 of the battery cell 20 in the second direction y, or electrode terminals 214 are disposed on the second wall 202 of the battery cell 20 in the vertical direction z.

[0235] exist Figure 11 In the example, electrode terminal 214 is located on the second wall 202 of the battery cell 20 in the vertical direction facing the bottom wall 102.

[0236] Of course, for a cuboid-shaped battery cell 20, the battery cell 20 may also include two second walls 202 disposed opposite to each other along the second direction y, the second direction y being not parallel to the first direction, for example, the second direction y being perpendicular to the first direction x; and multiple electrode terminals 214 being located on the same second wall 202 of the battery cell 20 in the second direction y.

[0237] Regardless of whether the multiple electrode terminals 214 are located on one side of the battery cell 20 in the second direction y or on one side of the battery cell 20 in the vertical direction z, when there are multiple battery cells 20 and the multiple battery cells 20 are arranged sequentially along the second direction y, the second walls 202 of two adjacent battery cells 20 are opposite each other in the second direction y.

[0238] It should be noted that in this application, the first wall 201 can be a plane or a curved surface, and the second wall 202 can be a plane or a curved surface.

[0239] In some embodiments, such as Figure 9 As shown, the first wall 201 is formed into a cylindrical shape; at this time, the battery cell 20 can be roughly a cylindrical battery cell.

[0240] In some embodiments, such as Figure 9As shown, a second wall 202 is provided at both axial ends of the first wall 201, and at least one second wall 202 is provided with an electrode terminal 214. Thus, all electrode terminals 214 of the battery cell 20 are provided on one of the second walls 202, or at least one electrode terminal 214 of the battery cell 20 is provided on one of the second walls 202, and the remaining electrode terminals 214 of the battery cell 20 are provided on the other second wall 202. This facilitates a flexible arrangement of the electrode terminals 214.

[0241] In some embodiments, such as Figure 9 As shown, one of the second walls 202 is provided with an exposed electrode terminal 214. The electrode assembly 22 includes a positive electrode 221 and a negative electrode 222. One of the positive electrode 221 and the negative electrode 222 is electrically connected to the electrode terminal 214, and the other of the positive electrode 221 and the negative electrode 222 is electrically connected to the first wall 201, so as to realize the normal power supply of the battery cell 20.

[0242] Of course, the other of the positive electrode 221 and negative electrode 222 can also be electrically connected to another second wall 202. That is to say, the second wall 202 with exposed electrode terminals 214 is not the same wall as the second wall 202 that is electrically connected to the other of the positive electrode 221 and negative electrode 222. This also facilitates the normal power supply of the battery cell 20.

[0243] In some embodiments, at least one battery cell 20 is a pouch cell. When the battery 100 includes one battery cell 20, that battery cell 20 is a pouch cell; when the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a pouch cell. This facilitates the diversification of the types, structures, and layouts of the battery cells 20 in the battery 100, thereby enabling the battery 100 to meet actual differentiated needs.

[0244] In some embodiments, such as Figure 4 and Figure 5 As shown, the battery cell 20 also includes a pressure relief mechanism 213. The pressure relief mechanism 213 and the electrode terminal 214 are disposed on the same wall of the battery cell 20. For example, the pressure relief mechanism 213 and the electrode terminal 214 are both disposed on the second wall 202.

[0245] Of course, in other embodiments of this application, the battery cell 20 also includes a pressure relief mechanism 213, which and the electrode terminal 214 are respectively disposed on two walls of the battery cell 20.

[0246] Therefore, the position of the pressure relief mechanism 213 relative to the electrode terminal 214 has a certain degree of flexibility.

[0247] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0248] The applicant has noted that when external moisture enters the casing, it corrodes the battery cells and other components inside, reducing battery safety and lifespan. In related technologies, to improve battery sealing, an additional sealing structure (such as a sealing plate) is installed inside the casing. However, this additional sealing structure increases the battery's structural complexity and is costly.

[0249] To improve battery safety and lifespan, the applicant discovered that the casing itself could be designed as a closed structure to reduce the complexity of the battery structure and the cost of the battery.

[0250] In some embodiments, such as Figure 10 and Figure 11 As shown, the box 10 includes a main body 11 and a bottom cover 12 disposed at the bottom of the main body 11. The bottom cover 12 and the main body 11 together enclose and form a receiving cavity 10a.

[0251] The main body 11 can be a one-piece structure or assembled from multiple parts. The main body 11 can be a hollow shell structure, defining a first space with an open bottom. A bottom cover 12 closes to the open portion of the first space. The bottom cover 12 can be a hollow structure with an opening on one side, and can possess a second space. The second space of the bottom cover 12 and the first space of the main body 11 together form a receiving cavity 10a. Alternatively, the bottom cover 12 may not possess a space forming the receiving cavity 10a. When the bottom cover 12 is placed over the open portion of the first space of the main body 11, the bottom cover 12 seals the first space of the main body 11, and the two together form a receiving cavity 10a equivalent to the first space. In this case, the bottom cover 12 can be a flat plate structure. Of course, the receiving cavity 10a of the box 10 can also be formed by a part of the first space of the main body 11. In this case, the bottom cover 12 can cover the opening of the first space and be recessed into the first space and occupy part of the space of the first space. The first space, excluding the part of the space occupied by the bottom cover 12, forms the receiving cavity 10a of the box 10.

[0252] Understandably, at this time, the bottom cover 12 is located at the bottom of the housing 10 and is used together with the main body 11 to define the receiving cavity 10a. Specifically, the bottom cover 12 may be, but is not limited to, a plate-like structure, a block-like structure, etc., and may be flat, curved, etc., without specific limitations.

[0253] When the battery cell 20 is located in the receiving cavity 10a, the battery cell 20 can be disposed on the bottom cover 12 and / or the main body 11. When the main body 11 is assembled from multiple components, the battery cell 20 can be disposed on one of the components or on all the components. In one embodiment, the main body 11 may include a top cover, a surrounding plate, and a support plate. The surrounding plate encloses a third space with openings at both ends in the vertical direction. The top cover and the bottom cover 12 respectively seal and cover the vertical ends of the third space. The top cover (e.g., the carrier 11a described below), the surrounding plate (e.g., the frame 11b described below), and the bottom cover 12 together enclose the receiving cavity 10a. The support plate is located in the third space, and the battery cell 20 is supported on the support plate. In other embodiments, the main body 11 may include the carrier 11a and the frame 11b described below for details. In this application, the carrier 11a may also be referred to as the support plate or the top plate, and the frame 11b may also be referred to as the side plate.

[0254] The bottom cover 12 and the main body 11 can be fixed together by welding, hot-melt connection, bonding, fastening, snap-fitting, etc. Fastening refers to the connection using fasteners 13, which include bolts, pins, rivets, dowels, screws, etc. Snap-fitting refers to fixing through a snap-fit ​​structure; for example, the bottom cover 12 has a hook, and the main body 11 has a latch. When the hook engages with the latch, the bottom cover 12 and the main body 11 are locked together. Of course, the connection methods between the bottom cover 12 and the main body 11 are not limited to these, and are not exhaustively described in this application.

[0255] In some embodiments, the bottom cover 12 is sealed to the main body 11 and together form a closed receiving cavity 10a. In this case, the housing 10 forms a sealed receiving cavity 10a by its own bottom cover 12 and its own main body 11, so that the airtightness of the battery 100 is guaranteed by the airtightness of the housing 10 itself, without the need for other sealing structures, and without the need to set other sealing structures in the housing 10. This simplifies the structure of the battery 100, reduces the cost of the battery 100, and at the same time ensures the safety and service life of the battery 100.

[0256] There are several ways to seal the bottom cover 12 and the main body 11, including but not limited to: setting a sealing element between the bottom cover 12 and the main body 11, and sealing the bottom cover 12 and the main body 11 through the sealing element; sealing the bottom cover 12 and the main body 11 through sealant; or sealing the bottom cover 12 and the main body 11 by interlocking with each other through a barrier structure formed by the interlocking surfaces.

[0257] In the description of this application, the bottom cover 12 of the battery 100 is located at the bottom of the main body 11, that is... Figure 10 and Figure 11The bottom cover 12, located at the bottom of the main body 11, is positioned in the vertical direction z. In actual use, Figure 10 and Figure 11 The upward and downward directions shown can be, but are not limited to, vertical, depending on the actual installation of the battery 100. It should be noted that in the following description of this application, the positional relationships and dimensions of the various structures of the battery 100 are described with reference to the vertical direction. This is not a limitation on the usage of the battery 100, but only to more clearly illustrate and explain the solution.

[0258] In some embodiments, the bottom cover 12 is sealed to the body 11 via a seal.

[0259] A seal is a component that prevents fluid or solid particles from leaking between adjacent mating surfaces, preventing external impurities such as dust and moisture from entering the battery 100. The seal connects the main body 11 and the bottom cover 12 by connecting the seal between the two opposing surfaces of the main body 11 and the bottom cover 12, and has a ring-shaped contact interface with these two surfaces. This prevents external moisture from entering the battery 100 through the contact surface between the seal and the two surfaces, thus achieving a sealing effect.

[0260] The sealing element can be a sealing ring or a sealing gasket. Specifically, the sealing element can be made of materials such as rubber or silicone. Specifically, the sealing element can be an O-ring, a square seal, or a non-circular seal. The specific shape of the sealing element can be adapted to the shape of the two opposing surfaces of the bottom cover 12 and the main body 11. For example, when the two opposing surfaces of the bottom cover 12 and the main body 11 are annular surfaces, the sealing element can be an O-ring.

[0261] At this time, the bottom cover 12 is sealed to the main body 11 through a sealing element, which is reliable and low cost.

[0262] It should be noted that after the bottom cover 12 is sealed to the main body 11 by the sealing element, it can also be fixedly connected to the main body 11 by other means. Other means include, but are not limited to, snap-fit, plug-in, threaded connection, riveting, welding, and bonding. Understandably, when the bottom cover 12 is sealed to the main body 11 by sealant, depending on the adhesive properties of the sealant, if the adhesive performance of the sealant meets the requirements (i.e., the bottom cover 12 and the main body 11 are fixed and do not separate), it is not necessary to use other means to fix the two together.

[0263] In some embodiments, such as Figure 10 and Figure 11As shown, the bottom cover 12 is detachably connected to the bottom of the main body 11. At this time, the main body 11 can be directly installed on the mounting body, and the bottom cover 12 and the main body 11 together form a receiving cavity 10a. When the components (such as battery cells) in the receiving cavity a need to be replaced or maintained, the components inside the battery 100 can be exposed and maintained or replaced simply by removing the bottom cover 12, without having to remove the entire battery 100 from the mounting body, which greatly improves the convenience of battery 100 maintenance.

[0264] The detachable connection between the bottom cover 12 and the main body 11 means that when the bottom cover 12 is connected to the main body 11, the bottom cover 12 has a first state in which it is fully connected to the main body 11 and forms a receiving cavity 10a, and a second state in which it is not fully connected to or separated from the main body 11 and can expose the battery cell 20. The bottom cover 12 can be switched from the first state to the second state and from the second state to the first state under external force operation, without damaging any parts in the process.

[0265] When the bottom cover 12 is in a second state relative to the main body 11, where it is not fully connected to the main body 11 and the receiving cavity 10a is open, the installation method of the bottom cover 12 and the main body 11 can be: the bottom cover 12 and the main body 11 are rotatably connected and can be fixedly connected via fasteners 13 or a snap-fit ​​method. When the bottom cover 12 rotates relative to the main body 11 to close the receiving cavity 10a, the bottom cover 12 and the main body 11 can be fixedly connected via fasteners 13 or a snap-fit ​​method, and the battery cell 20 is accommodated in the receiving cavity 10a and is not visible. At this time, the bottom cover 12 is in the first state. When the fasteners 13 are removed or the snap-fit ​​connection is released, the bottom cover 12 can rotate relative to the main body 11 to open the receiving cavity 10a and expose the position of the battery cell 20. At this time, the bottom cover 12 is in the second state. The rotatable connection between the bottom cover 12 and the main body 11 can be, but is not limited to, a rotatable connection between the bottom cover 12 and the main body 11 via a pivot.

[0266] When the bottom cover 12 is in a second state relative to the main body 11, separating from the main body 11 and opening the receiving cavity 10a, the bottom cover 12 and the main body 11 can be installed in a way that the bottom cover 12 and the main body 11 are fixedly connected only by fasteners 13 or by a snap-fit ​​mechanism. When the fasteners 13 are installed on the bottom cover 12 and the main body 11, or when the snap-fit ​​structure of the bottom cover 12 and the main body 11 is engaged, the bottom cover 12 and the main body 11 are completely fixed and together form the receiving cavity 10a, in which case the battery cell 20 is contained within the receiving cavity 10a and is not visible. At this time, the bottom cover 12 is in the first state. When the fasteners 13 are removed or all snap-fit ​​connections are released, the bottom cover 12 can be separated from the main body 11, thereby exposing the battery cell 20. At this time, the bottom cover 12 is in the second state.

[0267] When the bottom cover 12 is in the first state, it forms a receiving cavity 10a with the main body 11, which can protect the battery cell 20. When the bottom cover 12 is in the second state, the battery 100 is exposed, which makes it convenient for relevant personnel to maintain or replace the battery cell 20.

[0268] In some embodiments, please refer to Figure 11 The bottom cover 12 and the main body 11 are detachably connected via fasteners 13.

[0269] Fastener 13 refers to a component that can fasten two or more parts (or components) together into a whole, and may include, but is not limited to: screws, bolts, rivets, pins, pins, welding studs, etc.

[0270] At this point, the bottom cover 12 and the main body 11 are detachably connected by fasteners 13, which is not only convenient for disassembly and assembly, but also simple in structure and economical.

[0271] In some embodiments, such as Figure 14 and Figure 15 As shown, the minimum thickness h of the bottom cover 12 satisfies: 0.2mm < h < 20mm.

[0272] The thickness of the bottom cover 12 refers to the distance between the two vertical surfaces of the bottom cover 12 in a vertical cross-section. The minimum thickness h of the bottom cover 12 is the shortest distance between the two vertical surfaces of the bottom cover 12. When the thickness of the bottom cover 12 is uniform throughout, the bottom cover 12 can be flat (e.g., Figure 15 As shown, the minimum thickness of the bottom cover 12 is the same thickness at all points on the bottom cover 12. When the thickness of the bottom cover 12 is not uniform, the minimum thickness of the bottom cover 12 is the thickness at the thinnest point of the bottom cover 12.

[0273] Specifically, the minimum thickness h of the bottom cover 12 can be selected from 0.3mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.5mm, 4.7mm, 5mm, 5.5mm, 5.8mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 18.5mm, 19mm, 19.5mm, etc. Preferably, 0.5mm ≤ h ≤ 3mm.

[0274] At this point, it has been proven that when the minimum thickness h of the bottom cover 12 satisfies 0.2mm < h < 20mm, the weight of the battery 100 can be effectively reduced, and the strength structure is reasonable.

[0275] It should be noted that in the description of this application, with the vertical direction as a reference, the "thickness" of a structure refers to the distance between the two vertical surfaces of the structure in a cross-section. The term "thickness" will not be explained in detail in the following description; please refer to the description here. Of course, it is understood that the vertical direction is only for the convenience of illustrating the solution of this application and is not a limitation on the usage of battery 100.

[0276] In some embodiments, the weight M2 of the battery cell 20 and the minimum thickness h of the bottom cover 12 satisfy the following condition: 0.03 mm / Kg ≤ h / M2 ≤ 100 mm / Kg.

[0277] The weight M2 of a single battery cell 20 refers to the weight M2 of a single battery cell 20. When the battery 100 comprises multiple battery cells 20, the weight of a single battery cell 20 is the weight of each individual battery cell 20.

[0278] Specifically, the ratio of the minimum wall thickness h of the bottom cover 12 to the weight M2 of the battery cell 20 can be selected as 0.04mm / Kg, 0.05mm / Kg, 0.1mm / Kg, 0.4mm / Kg, 0.8mm / Kg, 1mm / Kg, 1.5mm / Kg, 2mm / Kg, 2.5mm / Kg, 3mm / Kg, 3.5mm / Kg, 4mm / Kg, 5mm / Kg, 6mm / Kg, 8mm / Kg, 10mm / Kg, 12mm / Kg. Kg, 13mm / Kg, 15mm / Kg, 16mm / Kg, 18mm / Kg, 20mm / Kg, 30mm / Kg, 35mm / Kg, 40mm / Kg, 45mm / Kg, 50mm / Kg, 5 5 / Kg, 60mm / Kg, 65mm / Kg, 68mm / Kg, 70mm / Kg, 75mm / Kg, 80mm / Kg, 85mm / Kg, 90mm / Kg, 95mm / Kg, 98mm / Kg.

[0279] Table 1. Impact of the ratio of minimum bottom cover thickness h to battery cell weight M2 on battery safety performance.

[0280] No. h(mm) m2(Kg) h / M2(mm / Kg) Test Results 1 0.2 10 0.02 Fire, explosion 2 0.5 10 0.05 No fire, no explosion 3 1.2 3 0.4 No fire, no explosion 4 3 1 3 No fire, no explosion 5 5 1.5 3.33 No fire, no explosion 6 8 1.8 4.45 No fire, no explosion 7 10 2 5 No fire, no explosion 8 12 1.6 7.5 No fire, no explosion 9 15 1.7 8.82 No fire, no explosion 10 20 2 10 No fire, no explosion 11 20 1 20 No fire, no explosion 12 20 0.5 40 No fire, no explosion 13 20 0.32 62.5 No fire, no explosion 14 20 0.25 80 No fire, no explosion 15 20 0.2 100 No fire, no explosion

[0281] Table 1 shows the test results of the ratio of the minimum thickness h of the bottom cover 12 to the weight m2 of the battery cell 20 on the safety performance of the battery 100 when tested according to the standard GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles". Table 1 shows that when h / m2 equals 0.02 mm / kg, the battery 100 is prone to fire and explosion, mainly because the structural strength of the battery 100 does not meet the requirements. When h / m2 is greater than 0.02 mm / kg, the structural strength of the bottom cover 12 is better, and the battery 100 is less likely to fire or explode. However, an excessively large h / m2 can lead to wasted space and low energy density; therefore, h / m2 should ideally not exceed 100 mm / kg.

[0282] At this point, it has been proven that when the minimum thickness h of the bottom cover 12 and the weight m2 of the battery cell 20 satisfy 0.03mm / Kg≤h / M2≤100mm / Kg, the battery 100 not only has good structural strength, but also high energy density and is not easy to catch fire or explode.

[0283] In some embodiments, please refer to Figures 10 to 12 The bottom cover 12 has a cover portion 12a and a mounting portion 12b. The mounting portion 12b surrounds and is connected to the edge of the cover portion 12a. The cover portion 12a is used to define the receiving cavity 10a, and the mounting portion 12b is connected to the main body 11.

[0284] The cover portion 12a defines the receiving cavity 10a; that is, the cover portion 12a and the main body 11 together enclose and form the receiving cavity 10a. The mounting portion 12b is connected to the main body 11 and does not participate in defining the receiving cavity 10a. The cover portion 12a can be a plate-shaped or block-shaped component, or a flat or curved plate-shaped component; its specific form is not limited. Figures 10-12 It can be seen that the mounting part 12b surrounding the edge of the cover part 12a means that the mounting part 12b is continuously arranged along the edge of the cover part 12a in a closed-end structure. Understandably, in its vertical projection, the mounting part 12b has a certain width, thus providing an appropriate contact area with the main body 11. This not only facilitates the positioning and installation of the mounting part 12b with the main body 11, but also facilitates the installation of sealing elements and helps improve the sealing performance between the mounting part 12b and the main body 11.

[0285] The cover 12a and the mounting part 12b can be integrally molded. When the bottom cover 12 is made of metal (such as aluminum, iron, stainless steel, etc.), the cover 12a and the mounting part 12b can be integrally molded by die casting, forging, hot pressing, cold pressing, etc. When the bottom cover 12 is made of plastic (such as PP, PE, ABS, etc.), the cover 12a and the mounting part 12b can be integrally molded by injection molding. The cover 12a and the mounting part 12b can also be molded separately and then connected together. When the cover 12a and the mounting part 12b are made of metal, they can be welded or bonded together. When the cover 12a and the mounting part 12b are made of plastic, they can be bonded together. Of course, the cover 12a and the mounting part 12b can also be fixedly connected together by snap-fit, riveting, or other methods.

[0286] The cover portion 12a and the mounting portion 12b can be located in the same plane. Specifically, optionally, the two surfaces of the cover portion 12a and the mounting portion 12b facing the body 11 are in the same plane, and / or the two surfaces of the cover portion 12a and the mounting portion 12b facing away from the body 11 are in the same plane. When the two surfaces of the cover portion 12a and the mounting portion 12b facing the body 11 and the two surfaces facing away from the body 11 are both in the same plane, the cover portion 12a and the mounting portion 12b can form a flat bottom cover 12 (e.g., ...). Figure 15 (As shown).

[0287] The cover portion 12a and the mounting portion 12b may not be located in the same plane. Specifically, the cover portion 12a may be recessed towards the main body 11 relative to the mounting portion 12b, or the cover portion 12a may protrude away from the main body 11 relative to the mounting portion 12b; the specific design is not limited. The thickness of the cover portion 12a and the mounting portion 12b may be equal or unequal; the specific design is not limited.

[0288] At this time, the bottom cover 12 defines the receiving cavity 10a via the cover portion 12a and is connected to the main body 11 via the mounting portion 12b, with a clear structure and convenient installation.

[0289] Understandably, when the bottom cover 12 is sealed to the main body 11, the bottom cover 12 is sealed to the main body 11 via the mounting portion 12b, that is, the mounting portion 12b is sealed to the main body 11. The sealing connection between the mounting portion 12b and the main body 11 can be a sealing connection using a sealing element, a sealing connection using sealant, etc., and will not be exhaustive. The sealing element can be any of the sealing elements mentioned above, and the arrangement of the sealing element can be referred to the above description, the difference being that the sealing element is arranged between the mounting portion 12b and the main body 11. When the mounting portion 12b and the main body 11 are sealed to each other using sealant, the sealant can be applied to all surfaces of the mounting portion 12b that come into contact with the main body 11.

[0290] Understandably, when the bottom cover 12 is detachably connected to the main body 11, the bottom cover 12 is detachably connected to the main body 11 via the mounting part 12b, that is, the mounting part 12b is detachably connected to the main body 11. The method of detachable connection between the mounting part 12b and the main body 11 can refer to the detachable method of the bottom cover 12 and the main body 11 described above. It is only necessary to set the part of the bottom cover 12 that is detachably connected to the main body 11 as the mounting part 12b. Therefore, the detachable connection method of the mounting part 12b and the main body 11 will not be described in detail here.

[0291] In some embodiments, the mounting part 12b is detachably connected to the main body 11.

[0292] Specifically, the bottom cover 12 also includes a fixing hole 12c provided on the mounting portion 12b. The fastener 13 passes through the fixing hole 12c on the mounting portion 12b and is then fastened to the main body 11. The fixing hole 12c is a through hole that penetrates the mounting portion 12b in the vertical direction. Specifically, the fixing hole 12c can be a smooth through hole (such as when the fastener 13 is a rivet), a threaded through hole (such as when the fastener 13 is a screw), or a through hole of other types (such as a hexagonal hole, a square hole, an oblong hole, etc.). The specific form of the fixing hole 12c depends on the specific form and setting method of the fastener 13, and will not be elaborated here.

[0293] In some embodiments, the cover portion 12a and the mounting portion 12b have the same thickness.

[0294] When the cover portion 12a and the mounting portion 12b are integrally formed, they can be integrally formed in the manner described above, such as die casting, cold pressing, hot pressing, injection molding, etc., which will not be elaborated here. Since the cover portion 12a and the mounting portion 12b have the same thickness, they can be quickly processed from the same metal plate by stamping, cutting, etc.

[0295] At this time, the thickness of the cover 12a and the mounting part 12b are equal, and the stress is equal at all points during molding, which can improve the molding rate of the one-piece molding. It can also be quickly processed by simple methods such as plate cutting. The structure of the bottom cover 12 is simpler and the processing is more convenient.

[0296] In some embodiments, please refer to Figure 12 and Figure 14 The cover portion 12a protrudes from the mounting portion 12b in a direction away from the receiving cavity 10a.

[0297] As can be seen from the above, the cover 12a defines the receiving cavity 10a, and the cover 12a protruding away from the receiving cavity 10a means that the cover 12a protrudes away from the main body 11. That is to say, the cover 12a and the mounting part 12b are staggered in the vertical direction, and the cover 12a is located at the lowest point of the bottom cover 12. When the cover portion 12a protrudes away from the receiving cavity 10a relative to the mounting portion 12b, a certain amount of redundant space can be formed between the cover portion 12a and the mounting portion 12b. This redundant space can increase the distance between the cover portion 12a and the battery cell 20. When an external force acts on the cover portion 12a, the redundant space can reduce the external force, thereby reducing or avoiding the external force acting on the battery cell 20 and causing damage to the battery cell 20. In particular, when the battery 100 is installed at the bottom of the vehicle 1000 and the bottom cover 12 is at the lowest point of the battery 100, stones and other objects on the ground are likely to fly and hit the bottom of the battery 100, i.e., the bottom cover 12, during the driving of the vehicle 1000. In this case, the redundant space can reduce the impact of external force on the battery cell 20. At the same time, the cover portion 12a protrudes relative to the mounting portion 12b, and the cover portion 12a of the bottom cover 12 can serve as a reinforcing structure of the bottom cover 12, improving the bending resistance of the bottom cover 12.

[0298] In some embodiments, the bottom cover 12 is located at the bottom of the housing 10 and is used to define the receiving cavity 10a, wherein the wall of the bottom cover facing the battery cell constitutes the bottom wall of the receiving cavity.

[0299] In some embodiments, please refer to Figure 16 The bottom cover 12 and the battery cell 20 are spaced apart.

[0300] The spacing between the bottom cover 12 and the battery cell 20 refers to the vertical distance r maintained between them. This spacing r creates a buffer space between the bottom cover 12 and the battery cell 20, preventing external forces acting on the bottom cover 12 from being transmitted to the battery cell 20 and damaging it. This is especially important when the battery 100 is installed at the bottom of the vehicle 1000 and the bottom cover 12 is at its lowest point. During vehicle operation, stones or other debris on the ground can easily fly and strike the bottom cover 12. In this case, the buffer space can interrupt the transmission of external forces to the battery cell 20, preventing any impact on it.

[0301] The bottom cover 12 and the battery cell 20 can be spaced apart by the redundant space formed between the protruding cover portion 12a and the mounting portion 12b in the above embodiment, or by maintaining a set distance between the end of the battery cell 20 located inside the main body 11 and facing the bottom cover 12 and the end of the main body 11 facing the bottom cover 12. That is, the battery cell 20 is only located within a portion of the receiving cavity 10a defined by the main body 11, and not within the receiving cavity 10a defined by the bottom cover 12, thereby ensuring that a set distance r is maintained between the battery cell 20 and the bottom cover 12 to form a buffer space.

[0302] Understandably, when the battery 100 includes multiple battery cells 20, all battery cells 20 are spaced apart from the bottom cover 12. Furthermore, to ensure uniformity in the size of the battery cells 20, the spacing between each battery cell 20 and the bottom cover 12 is equal.

[0303] In some embodiments, please refer to Figure 12 , Figure 13 and Figure 15 The bottom cover 12 has a feature surface 12d facing the receiving cavity 10a. The feature surface 12d is constructed as a plane to reduce the occupancy of the bottom cover 12 on the receiving cavity 10a and to use as much space as possible to install the battery cell 20, so as to improve the energy density and range of the battery.

[0304] The feature surface 12d facing the receiving cavity 10a indicates that feature surface 12d is the inner surface of the bottom cover 12 that defines the receiving cavity 10a. Feature surface 12d is constructed as a plane meaning that, in the arrangement direction of the body 11 and the bottom cover 12, feature surface 12d is a plane perpendicular to that direction. In practice, when the body 11 and the bottom cover 12 are arranged vertically, the feature surface 12d of the bottom cover 12 is a plane parallel to the horizontal plane. When the body 11 and the bottom cover 12 are arranged horizontally, the feature surface 12d of the bottom cover 12 is a plane parallel to the vertical plane.

[0305] When the feature surface 12d is planar, it can maintain a relatively uniform distance (this distance can be zero) from each battery cell 20 housed within the housing cavity 10a. When the distance between the feature surface 12d and the battery cell 20 is relatively uniform, the housing cavity 10a can accommodate more battery cells 20, meaning the space utilization of the housing cavity 10a is higher, the battery 100 can have a higher energy density, and the battery 100 has a longer driving range.

[0306] Understandably, when the bottom cover 12 has the aforementioned cover portion 12a and the aforementioned mounting portion 12b, the feature surface 12d can be formed by the inner surface of the cover portion 12a facing the receiving cavity 10a. Further understandably, when the bottom cover 12 is spaced apart from the battery cell 20, the feature surface 12d is spaced apart from the battery cell 20.

[0307] In some embodiments, the outer surface of the cover 12a facing away from the receiving cavity 10a is parallel to the feature surface 12d.

[0308] The outer surface of the cover 12a, facing away from the receiving cavity 10a, is arranged vertically opposite to the feature surface 12d. The outer surface of the cover 12a is designed to come into contact with the atmospheric environment and withstand external impacts. When the outer surface of the cover 12a is a plane flush with the feature surface 12d, especially when the bottom cover 12 and the main body 11 are arranged vertically at the bottom of the vehicle 1000 and the bottom cover 12 is located at the lowest point of the battery 100, the flat outer surface of the cover 12a can greatly reduce the wind resistance generated by the battery 100, which helps to reduce the driving resistance of the vehicle 1000, reduce the driving energy consumption of the vehicle 1000, and improve the driving range of the battery 100.

[0309] Figure 17 for Figure 13 The diagram shows a vertical orthographic projection of the bottom cover 12. S1 represents the projected area of ​​the feature surface 12d, and S2 represents the projected area of ​​the bottom cover 12.

[0310] In some embodiments, in the vertical direction, the area S1 of the orthographic projection of the feature surface 12d and the area S2 of the orthographic projection of the bottom cover 12 satisfy: S1 / S2≥0.2. Further, S1 / S2≥0.5.

[0311] exist Figure 17 In the illustrated embodiment, in the vertical orthographic projection, the feature surface 12d is formed by connecting the first feature edge d1, the second feature edge d2, the third feature edge d3, and the fourth feature edge d4 end to end. The area S1 of the orthographic projection of the feature surface 12d is the area defined by the first feature edge d1, the second feature edge d2, the third feature edge d3, and the fourth feature edge d4. The area S2 of the orthographic projection of the bottom cover 12 is the area defined by the edge of the bottom cover 12. Specifically, the ratio of the area S1 of the orthographic projection of the feature surface 12d to the area S2 of the orthographic projection of the bottom cover 12 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0312] Table 2 shows the impact of the ratio of area S1 to area S2 on the battery's 100km driving range.

[0313] No. <![CDATA[S1 / mm 2 ]]> <![CDATA[S2 / mm 2 ]]> S1 / S2 Test Results 1 <![CDATA[0.3×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.115 Difference 2 <![CDATA[0.52×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.2 better 3 <![CDATA[0.94×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.362 better 4 <![CDATA[1.3×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.5 good 5 <![CDATA[1.5×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.577 good 6 <![CDATA[1.8×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.629 good 7 <![CDATA[2.2×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.846 excellent 8 <![CDATA[2.4×10 6 ]]> <![CDATA[2.6×10 6 ]]> 0.923 excellent 9 <![CDATA[2.6×10 6 ]]> <![CDATA[2.6×10 6 ]]> 1 excellent

[0314] Table 2 shows the impact of the ratio of the area S1 of the orthographic projection of the feature surface 12d to the area S2 of the orthographic projection of the bottom cover 12 on the driving range of battery 100, tested according to the NEDC (New European Driving Cycle) standard. When S1 / S2 is less than 0.2, the driving range of battery 100 is poor. This is because when the feature surface 12d is small, the space utilization of the cavity 10a is low, the number of battery cells 20 housed in battery 100 is small, and the energy density of battery 100 is relatively low, resulting in a short driving range and poor test results. When the ratio of S1 / S2 reaches 0.2 or above (especially when S1 / S2 reaches 0.5 or above), the driving range of battery 100 is better as the ratio increases. This is because the larger the feature surface 12d, the higher the space utilization of the cavity 10a, and the higher the energy density of battery 100. Therefore, the driving range of battery 100 increases, and the test results improve.

[0315] Since feature surface 12d is planar, the larger the area occupied by feature surface 12d in the bottom cover 12, the smaller the area of ​​the inner surface of the bottom cover 12 that is concave or convex relative to feature surface 12d. A concave inner surface relative to feature surface 12d will cause some space in the receiving cavity 10a to be irregular, making it impossible to install the battery cell 20, resulting in low space utilization of the receiving cavity 10a. Similarly, a portion of the space in the receiving cavity 10a formed by the convex inner surface relative to feature surface 12d will also be irregular and unable to accommodate the battery cell 20, resulting in low space utilization of the receiving cavity 10a. When the space utilization of the receiving cavity 10a is low, the volume occupied by the battery cell 20 per unit space in the battery 100 is small, and the energy density of the battery 100 is low. Therefore, the larger the area occupied by feature surface 12d in the bottom cover 12, the greater the space utilization of the battery 100, the higher the energy density of the battery 100, and the better the driving range of the battery 100.

[0316] In some embodiments, please refer to Figure 17 In the vertical direction, the orthographic projection of feature surface 12d is rectangular.

[0317] like Figure 17 As shown, the rectangular feature surface 12d is the region enclosed by the first feature side d1, the second feature side d2, the third feature side d3, and the fourth feature side d4. In the battery 100, multiple battery cells 20 are mostly assembled to form a rectangular structure. Constructing the feature surface 12d to be rectangular can adapt to the overall structure formed by the battery cells 20 within the battery 100, which helps to arrange more battery cells 20 within the receiving cavity 10a and improve the energy density of the battery 100.

[0318] Of course, in other embodiments, the orthographic projection of the feature surface 12d in the vertical direction can also be other shapes, such as circles, polygons, ellipses and other irregular shapes.

[0319] In embodiments of this application, the main body 11 includes a support member 11a. The support member 11a may be a component in the main body 11 used to define the receiving cavity 10a (e.g., the support member 11a is the top cover or frame mentioned above), or it may be a component that is not used to define the receiving cavity 10a but is located within the receiving cavity 10a (e.g., the support member 11a is the support plate mentioned above), and there is no specific limitation. When the support member 11a is used to define the receiving cavity 10a, the support member 11a may be a component in the main body 11 that is directly connected to the bottom cover 12 (such as the frame mentioned above), or it may be a component that is not connected to the bottom cover 12 (such as the top cover mentioned above).

[0320] In some embodiments, the top of the housing 10 is provided with a support member 11a, and the battery cell 20 is disposed on the surface of the support member 11a.

[0321] At this point, the support component 11a is a part capable of supporting the weight of the battery cell 20. It can be a support plate, support rod, support block, support piece, support frame, support rope, etc., and the specific type is not limited. Specifically, the battery cell 20 can be supported on the support component 11a, and in this case, the battery cell 20 can be positioned above the support component 11a. Alternatively, the battery cell 20 can be hung on the support component 11a, and in this case, the battery cell 20 can be hung on the wall surface of the support component 11a that is parallel to the direction of gravity of the battery cell 20.

[0322] The battery cell 20 can be positioned above the support member 11a (e.g., when the support member 11a serves as a support plate located within the receiving cavity 10a), below the support member 11a (e.g., when the support member 11a serves as a top cover defining the receiving cavity 10a), or to the side of the support member 11a (e.g., when the support member 11a serves as a frame defining the receiving cavity 10a).

[0323] In some embodiments, the battery cell 20 is bonded to the carrier 11a. This bonding connection reduces the required vertical Z-axis dimension when connecting the battery cell 20 to the carrier 11a, thereby reducing the overall thickness of the battery. For example, the carrier 11a defines a receiving cavity 10a, and the battery cell 20 is suspended from the carrier 11a.

[0324] Specifically, the battery cell 20 and the carrier 11a can be bonded together using adhesives such as epoxy resin or acrylic adhesive, without limitation. This bonding between the battery cell 20 and the carrier 11a not only facilitates connection but also simplifies the structure of the battery 100.

[0325] In some embodiments, the wall of the support member 11a facing the battery cell 20 constitutes the top wall 101 of the receiving cavity 10a. For example, the battery cell 20 may be disposed on the top wall 101 of the receiving cavity 10a.

[0326] In some embodiments, such as Figure 21 As shown, the battery cell 20 is disposed on the surface of the support member 11a, and the minimum thickness H of the support member 11a and the weight M1 of the battery 100 satisfy the following condition: 0.0002mm / kg < H / M1 ≤ 0.2mm / kg. In this condition, the support member 11a can support the weight of the battery cell 20, and the battery 100 has good structural strength, preventing fire and explosion. Simultaneously, the battery has a high energy density and a longer driving range.

[0327] The thickness of the support member 11a refers to the distance between one side surface of the support member 11a used to mount the battery cell 20 and its opposite side surface. When the battery cell 20 is mounted on the vertical surface of the support member 11a, the minimum thickness H of the support member 11a refers to the point where the distance between the two vertical surfaces of the support member 11a is minimum. When the battery cell 20 is mounted on the horizontal surface of the support member 11a, the thickness of the support member 11a refers to the point where the distance between the two horizontal surfaces of the support member 11a is minimum.

[0328] The weight of battery 100 includes the entire weight of the main body 11, bottom cover 12, battery cell 20 and other components (such as wiring harness, thermal management system, power management system, etc.).

[0329] Specifically, the ratio between the minimum thickness H of the support member 11a and the weight M1 of the battery 100 can be designed as follows: 0.0003mm / kg, 0.0005mm / kg, 0.0008mm / kg, 0.001mm / kg, 0.003mm / kg, 0.005mm / kg, 0.008mm / kg, 0.01mm / kg, 0.03mm / kg, 0.05mm / kg, 0.06mm / kg, 0.08mm / kg, 0.1mm / kg, 0.12mm / kg, 0.15mm / kg, 0.16mm / kg, 0.19mm / kg, and 0.02mm / kg.

[0330] Table 3. The impact of the ratio of the minimum thickness H of the load-bearing component 11a to the weight M1 of the battery 100 on the safety performance of the battery 100.

[0331] No. H(mm) M1 (Kg) H / M (mm / Kg) Test Results 1 0.1 1000 0.0001 Fire, explosion 2 0.2 1000 0.0002 Fire, explosion 3 0.6 600 0.001 No fire, no explosion 4 1.5 500 0.003 No fire, no explosion 5 2.5 500 0.005 No fire, no explosion 6 4 500 0.008 No fire, no explosion 7 3 300 0.01 No fire, no explosion 8 9 300 0.03 No fire, no explosion 9 10 200 0.05 No fire, no explosion 10 12 200 0.06 No fire, no explosion 11 16 200 0.08 No fire, no explosion 12 20 200 0.1 No fire, no explosion 13 30 200 0.15 No fire, no explosion 14 40 200 0.02 No fire, no explosion

[0332] Table 3 shows the impact of the ratio of the minimum thickness H of the support component 11a to the weight M1 of the battery 100 on the safety performance of several groups of batteries 100 tested according to GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles". Table 3 shows that when the H / M ratio does not exceed 0.0002 mm / kg, the battery 100 will catch fire and explode, because the structural strength of the battery 100 does not meet the requirements. When the H / M ratio exceeds 0.0002 mm / kg, the battery 100 will not catch fire or explode. However, when H / M is too large (e.g., exceeding 0.1), due to the small weight of the battery 100 and the large thickness of the support plate, the proportion of battery cells 20 in the unit volume of the battery 100 is low, resulting in low space utilization, low energy density, and high operating costs. Furthermore, if 0.0005mm / Kg≤H / M≤0.1mm / Kg, the structural strength of battery 100 meets the requirements and the energy density of battery 100 is relatively high. Battery 100 has a stronger range and will not cause safety accidents such as fire or explosion.

[0333] In some embodiments, the minimum thickness H of the support member 11a satisfies: 0.2mm < H < 20mm.

[0334] Specifically, the minimum thickness H of the support member 11a can be: 0.3mm, 0.5mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 9mm, 10mm, 12mm, 15mm, 16mm, 18mm, or 19mm. Further, 0.5mm ≤ H ≤ 10mm. At this thickness, the support member 11a has good structural strength, the battery 100 has good overall strength, and the battery 100 is less prone to fire and explosion. Simultaneously, the support member 11a occupies a small volume of the battery 100, resulting in high space utilization and high energy density.

[0335] In some embodiments, please refer to Figure 11 , Figure 16 and Figure 27 The battery cell 20 is suspended from the support member 11a. For example, the support member 11a is used to define the receiving cavity 10a, and the battery cell 20 is suspended from the support member 11a.

[0336] The battery cell 20 being suspended from the support member 11a means that the battery cell 20 is positioned vertically below the support member 11a, and the weight of the battery cell 20 is borne by the support member 11a. The battery cell 20 can be suspended from the support member 11a in the following ways: the battery cell 20 is directly adhered to the lower surface of the support member 11a; the battery cell 20 is connected to the support member 11a via fasteners 13 and is positioned below the support member 11a; or the battery cell 20 is hung on the support member 11a via hooks or the like and is positioned below the support member 11a.

[0337] At this time, the battery cell 20 is suspended below the support member 11a, and the bottom cover 12 is located at the bottom of the housing 10. When repairing the inside of the battery 100, the battery cell 20 can be exposed by removing the bottom cover 12 without removing the support member 11a, making the maintenance of the battery 100 more convenient. At the same time, when repairing the battery 100, the battery cell 20 can be removed and installed on the support member 11a from below. In particular, when the support member 11a is at least part of the chassis of the vehicle 1000 and bears the load, the battery cell 20 only needs to be removed and installed from below the support member 11a without removing the support member 11a, which facilitates the maintenance of the battery 100.

[0338] In some embodiments, please refer to Figure 18 and Figure 46 The outer surface of the battery cell 20 facing the support member 11a is the first outer surface m1 (which can also be understood as the top wall 204 of the battery cell 20 described in this application), and the electrode terminals 214 are arranged on the outer surface of the battery cell 20 other than the first outer surface m1.

[0339] As described above, electrode terminals 214 are used for electrical connection with the electrode assembly 23 inside the battery cell 20 to output or input electrical energy into the battery cell 20. Electrode terminals 214 extend at least partially outside the battery cell 20 for external electrical connection. Series and parallel connections between battery cells 20 are achieved through series and parallel connections between their respective electrode terminals 214. Electrode terminals 214 are conductive to enable electrical transmission and can be aluminum electrodes, copper electrodes, etc.

[0340] Electrode terminals 214 are arranged on the outer surface of the battery cell 20, excluding the first outer surface m1. The first outer surface m1 faces the support member 11a and is typically a smooth surface without any protruding or recessed structures such as electrode terminals 214 or liquid injection holes. When the battery cell 20 is suspended from the support member 11a, the first outer surface m1 is the upward-facing outer surface of the battery cell 20. In one specific embodiment, the battery cell 20 includes the housing 211 and end cap 212 mentioned above. The housing 211 and end cap 212 form the internal environment of the battery cell 20 that accommodates the electrode assembly 23. The end cap 212 is located at one end of the housing 211, and the electrode terminals 214 are arranged on the end cap 212. In this case, either outer surface of the housing 211 can serve as the first outer surface m1 of the battery cell 20.

[0341] Electrode terminal 214 includes a positive terminal and a negative terminal. The positive terminal is used for electrical connection with the positive electrode plate in electrode assembly 23, and the negative terminal is used for electrical connection with the negative electrode plate in electrode assembly 23. It should be noted that the positive and negative terminals can be arranged on the same outer surface of the battery cell 20 (e.g., a square battery cell 20), or they can be arranged on two different outer surfaces of the battery cell 20 (e.g., a cylindrical battery cell 20). When the positive and negative terminals are arranged on two different outer surfaces of the battery cell 20, the first outer surface m1 is a surface of the battery cell 20 that is different from these two outer surfaces.

[0342] In addition to the individual battery cells 20, the battery 100 typically includes components such as sampling harnesses for electrically connecting each battery cell 20, high-voltage wiring harnesses, and protective structures for protecting the battery cells 20. In this case, the electrode terminals 214 are arranged on the surfaces of the battery cells 20 other than the first outer surface m1. When the sampling harnesses, high-voltage wiring harnesses, and protective structures are placed on the electrode terminals 214, they are not restricted by the support member 11a and can be arranged through the space between the battery cells 20 and other structures of the main body 11 other than the support member 11a (such as the space between the battery cells and the bottom cover and / or the space between the battery cells and the inner side of the main body), making the arrangement of each component more convenient. Simultaneously, since the first outer surface m1 is a smooth surface, it can be fitted to the support member 11a, thus achieving a close fit between the battery cells 20 and the support member 11a without needing to reserve space between them, which helps improve the space utilization of the battery 100.

[0343] In some embodiments, please refer to Figure 18 The battery cell 20 has a second outer surface m2 (which can also be understood as the bottom wall 205 of the battery cell 20 described in this application) disposed opposite to the first outer surface m1, and electrode terminals 214 are arranged on the second outer surface m2.

[0344] The second outer surface m2 is the outer surface of the battery cell 20 that is positioned opposite to the first outer surface m1. When the battery cell 20 is suspended from the support member 11a, the second outer surface m2 is opposite to the bottom cover 12. As mentioned above, the battery cell 20 and the bottom cover 12 can be spaced apart. At this time, there is a buffer space between the second outer surface m2 and the bottom cover 12, and the portion of the electrode terminal 214 extending beyond the battery cell 20 is located within this buffer space. Thus, the wiring harness and connecting piece connected to the electrode terminal 214 can be arranged within the buffer space. At the same time, the buffer space also has the ability, as mentioned above, to prevent external forces striking the bottom cover 12 from affecting the battery cell 20 and damaging it. Therefore, the buffer space not only interrupts the influence of external forces but also allows for the arrangement of wiring harnesses, etc., achieving two benefits at once. In addition, the space utilization of the buffer space and the battery 100 is also improved.

[0345] Of course, in other embodiments, refer to Figure 46 The electrode terminal 214 can also be arranged on the third outer surface m3 of the battery cell 20 that intersects with the first outer surface m1.

[0346] In some embodiments, please refer to Figure 11 and Figure 16 The support member 11a is located at the top of the housing 10 and defines the receiving cavity 10a. Since the bottom cover 12 is located at the bottom of the housing 10, the support member 11a is arranged opposite to the bottom cover 12. As the structure at the top of the housing 10, the housing 10 can be mounted on the mounting body via the support member 11a. At this time, the battery cell 20 provided on the support member 11a can strengthen the strength of the support member 11a, thereby improving the rigidity of the top of the battery 100. This can extend the application scenarios of the battery 100 to scenarios where the top is subjected to force, such as its use as part of the chassis of a vehicle 1000.

[0347] In some embodiments, such as Figure 20 and Figure 22 As shown, the carrier 11a has a carrier surface 12f facing the receiving cavity 10a, and the carrier surface 12f is constructed as a plane.

[0348] The bearing surface 12f is the inner surface of the bearing member 11a facing the receiving cavity 10a, and it defines the receiving cavity 10a. The bearing surface 12f is constructed as a plane, meaning that in the arrangement direction of the main body 11 and the bottom cover 12, the bearing surface 12f is a plane perpendicular to the arrangement direction. In practice, when the main body 11 and the bottom cover 12 are arranged vertically, the bearing member 11a and the bottom cover 12 are arranged opposite each other vertically, and the bearing surface 12f of the bearing member 11a is a plane parallel to the horizontal plane. When the main body 11 and the bottom cover 12 are arranged horizontally, the bearing member 11a and the bottom cover 12 are arranged opposite each other horizontally, and the bearing surface 12f of the bearing member 11a is a plane parallel to the vertical plane.

[0349] like Figure 20 and Figure 30 As shown, the carrier 11a can be the entire inner surface of the carrier 11a facing the receiving cavity 10a, in which case the carrier 11a can be flat. For example... Figure 21 and Figure 22 As shown, the carrier 11a can also be a part of the inner surface of the carrier 11a facing the receiving cavity 10a. In this case, the carrier surface 12f is only the part of the inner surface of the carrier 11a used to define the receiving cavity 10a.

[0350] When the bearing surface 12f is a plane, the bearing surface 12f can maintain a relatively equal distance (this distance can be zero) from each battery cell 20 housed in the housing cavity 10a. When the distance between the bearing surface 12f and the battery cell 20 is relatively equal, the housing cavity 10a can accommodate more battery cells 20, which means that the space utilization of the housing cavity 10a is higher, the battery 100 can have a higher energy density, and the battery 100 has a longer range.

[0351] In some embodiments, the battery cell 20 is disposed on the bearing surface 12f. The battery cell 20 is mounted on the carrier 11a via the bearing surface 12f. In this case, when assembling the battery, the carrier can be installed first, and then the battery cell can be hoisted from bottom to top. In particular, when the carrier is at least part of the vehicle chassis, the carrier, as a load-bearing structure, can be installed on the mounting body first, and then the battery cell can be hoisted from bottom to top, which makes battery assembly more convenient. The battery cell suspended on the carrier can strengthen the strength of the carrier, thereby increasing the rigidity of the top of the battery. This can extend the battery application scenarios to scenarios where the top is subjected to loads, such as when used as part of the vehicle chassis.

[0352] The battery cell 20 can be bonded to the bearing surface 12f, or fixedly connected to the bearing surface 12f by fasteners 13, or welded or snapped to the bearing surface 12f, and the specific method is not limited.

[0353] Because the bearing surface 12f is planar, it has a larger contact area with the battery cell 20 mounted on it, making the installation of the battery cell 20 more stable. Furthermore, compared to curved or uneven surfaces, the planar bearing surface 12f can connect with a larger number of battery cells 20, increasing the number of battery cells 20 installed within the battery 100, thereby improving the space utilization and energy density of the battery 100.

[0354] Understandably, when the battery cell 20 is suspended from the support member 11a, the battery cell 20 is suspended from the support surface 12f.

[0355] In some embodiments, in the vertical direction, the area N1 of the orthographic projection of the bearing surface 12f and the area N2 of the orthographic projection of the bearing member 11a satisfy: N1 / N2 ≥ 0.2. Further, N1 / N2 ≥ 0.5.

[0356] exist Figure 22 In the illustrated embodiment, in the vertical orthographic projection, the bearing surface 12f is formed by the first bearing edge f1, the second bearing edge f2, the third bearing edge f3, and the fourth bearing edge f4 connected end to end. The area N1 of the orthographic projection of the bearing surface 12f is the area defined by the first bearing edge f1, the second bearing edge f2, the third bearing edge f3, and the fourth bearing edge f4. The area N2 of the orthographic projection of the bearing member 11a is the area defined by the edge of the bearing member 11a.

[0357] Specifically, the ratio of the area N1 of the orthographic projection of the bearing surface 12f to the area N2 of the orthographic projection of the bearing member 11a can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0358] Table 4. The impact of the ratio of area N1 to area N2 on the battery's 100km driving range.

[0359] No. <![CDATA[N1(mm 2 )]]> <![CDATA[N2(mm 2 )]]> N1 / N2 Test Results 1 <![CDATA[1.8×10 5 ]]> <![CDATA[2.16×10 6 ]]> 0.083 Difference 2 <![CDATA[2.16×10 5 ]]> <![CDATA[2.16×10 6 ]]> 0.1 Difference 3 <![CDATA[4.32×10 5 ]]> <![CDATA[2.16×10 6 ]]> 0.2 better 4 <![CDATA[8×10 5 ]]> <![CDATA[2.16×10 6 ]]> 0.37 better 5 <![CDATA[1.2×10 6 ]]> <![CDATA[2.16×10 6 ]]> 0.56 good 6 <![CDATA[1.7×10 6 ]]> <![CDATA[2.16×10 6 ]]> 0.787 excellent 7 <![CDATA[2.16×10 6 ]]> <![CDATA[2.16×10 6 ]]> 1 Optimal

[0360] Table 4 shows the impact of the ratio of the area N1 of the orthographic projection of several bearing surfaces 12f to the area N2 of the orthographic projection of the bearing component 11a on the driving range of battery 100 when tested according to the NEDC (New European Driving Cycle) standard. When N1 / N2 is less than 0.2, the driving range of battery 100 is poor. The reason for this is that when the bearing surface 12f is small, the number of battery cells 20 supported on the bearing component 11a is small, the space utilization rate of the housing cavity 10a is low, and the energy density of battery 100 is relatively low, resulting in a shorter driving range and poorer test results. When the N1 / N2 ratio reaches 0.2 or higher (especially when N1 / N2 reaches 0.5 or higher), the larger the ratio, the better the driving range of battery 100. This is because a larger bearing surface 12f allows for a greater number of battery cells 20 supported on the bearing member 11a, resulting in higher space utilization of the housing cavity 10a and higher energy density of battery 100. Therefore, battery 100 achieves increasingly longer driving ranges and a better testing structure. When the bearing member 11a is... Figure 20 When the flat plate structure is shown, the projected area N1 of the bearing surface 12f is equal to the projected area N2 of the bearing member 11a, and the battery 100 has the best battery life.

[0361] In some embodiments, the orthographic projection of the bearing surface 12f in the vertical direction is rectangular.

[0362] like Figure 22 As shown, the rectangular support surface 12f is the area defined by the first support edge f1, the second support edge f2, the third support edge f3, and the fourth support edge f4. In the battery 100, multiple battery cells 20 are mostly assembled to form a rectangular structure. Constructing the support surface 12f to be rectangular can adapt to the overall structure of the battery, which helps to arrange more battery cells 20 within the housing cavity 10a and improve the energy density of the battery 100.

[0363] Of course, in other embodiments, the orthographic projection of the bearing surface 12f in the vertical direction can also be other shapes, such as circles, polygons, ellipses and other irregular shapes.

[0364] In some embodiments, please refer to Figure 21 The support member 11a has a support portion 11a1 and a connecting portion 11a2. The connecting portion 11a2 surrounds and connects to the edge of the support portion 11a1. The support portion 11a1 is used to define the receiving cavity 10a. The connecting portion 11a2 is connected to the part of the housing 10 other than the support member 11a.

[0365] The supporting part 11a1 defines the receiving cavity 10a, and the connecting part 11a2 connects to the part of the housing 10 other than the supporting part 11a, and does not participate in defining the receiving cavity 10a. The supporting part 11a1 can be a plate-shaped or block-shaped component, or a flat plate-shaped or curved plate-shaped component; the specific design is not limited. Figure 21 As can be seen, the connection portion 11a2 enclosing the edge of the support portion 11a1 means that the connection portion 11a2 is a structure that is continuously connected end-to-end along the edge of the support portion 11a1. Understandably, in the vertical projection, the connection portion 11a2 has a certain width, thus allowing for an appropriate contact area with other structures of the housing 10 besides the support member 11a, and more easily facilitating the installation connection between the connection portion 11a2 and other structures of the housing 10 besides the support member 11a.

[0366] The supporting part 11a1 and the connecting part 11a2 can be integrally molded. When the supporting part 11a is made of metal (such as aluminum, iron, stainless steel, etc.), the supporting part 11a1 and the connecting part 11a2 can be integrally molded by die casting, forging, hot pressing, cold pressing, etc. When the supporting part 11a is made of plastic (such as PP, PE, ABS, etc.), the supporting part 11a1 and the connecting part 11a2 can be integrally molded by injection molding. The supporting part 11a1 and the connecting part 11a2 can also be molded separately and then connected together. When the supporting part 11a1 and the connecting part 11a2 are made of metal, they can be welded or bonded together. When the supporting part 11a1 and the connecting part 11a2 are made of plastic, the cover part 12a and the mounting part 12b can be bonded together. Of course, the supporting part 11a1 and the connecting part 11a2 can also be fixedly connected together by snap-fitting, riveting, or other methods.

[0367] Specifically, the connecting part 11a2 is connected to the part of the main body 11 other than the bearing member 11a. The connection method can be either integral molding or fixed connection. When the connecting part 11a2 is integrally molded with the part of the main body 11 other than the bearing member 11a, that is, the main body 11 is an integrally molded part, it can be integrally molded by die casting, forging, hot pressing, cold pressing, injection molding, etc. When the connecting part 11a2 is fixedly connected to the part of the main body 11 other than the bearing member 11a, it can be fixedly connected by fastener 13, snap-fit ​​structure, etc., and the specific method is not limited.

[0368] The supporting portion 11a1 and the connecting portion 11a2 can be located in the same plane. Specifically, optionally, the two surfaces of the supporting portion 11a1 and the connecting portion 11a2 facing the bottom cover 12 are in the same plane, and / or the two surfaces of the supporting portion 11a1 and the connecting portion 11a2 facing away from the bottom cover 12 are in the same plane. When the two surfaces of the supporting portion 11a1 and the connecting portion 11a2 facing the bottom cover 12 and the two surfaces facing away from the bottom cover 12 are both in the same plane, the supporting portion 11a1 and the connecting portion 11a2 can form a flat supporting member 11a (e.g., ...). Figure 20 (As shown).

[0369] The supporting portion 11a1 and the connecting portion 11a2 may not be located in the same plane. Specifically, the supporting portion 11a1 may protrude away from the receiving cavity 10a relative to the connecting portion 11a2, or the supporting portion 11a1 may be recessed towards the receiving cavity 10a relative to the connecting portion 11a2; the specific design is not limited. The thickness of the supporting portion 11a1 and the connecting portion 11a2 may be equal or unequal; the specific design is not limited.

[0370] At this time, the carrier 11a defines the receiving cavity 10a via the carrier portion 11a1 and is connected to the main body 11 by the connecting portion 11a2, except for the carrier 11a, and the structure is clearly defined.

[0371] Understandably, when the support member 11a includes the aforementioned support portion 11a1 and the aforementioned connecting portion 11a2, the battery cell 20 is disposed on the support portion 11a1.

[0372] Understandably, when the carrier 11a includes the aforementioned carrier portion 11a1 and the aforementioned connecting portion 11a2, the inner surface of the carrier portion 11a1 facing the receiving cavity 10a is configured to form a carrier surface 12f.

[0373] In some embodiments, the support portion 11a1 protrudes from the connecting portion 11a2 in a direction away from the receiving cavity 10a.

[0374] As described above, the supporting portion 11a1 defines the receiving cavity 10a, and the fact that the supporting portion 11a1 protrudes away from the receiving cavity 10a means that the supporting portion 11a1 and the connecting portion 11a2 are arranged offset in the vertical direction. The supporting portion 11a1 is located at the highest point of the supporting member 11a. At this time, a certain space can be formed between the supporting portion 11a1 and the connecting portion 11a2, which is part of the receiving cavity 10a and can accommodate the battery cell 20.

[0375] When the bearing portion 11a1 protrudes away from the receiving cavity 10a relative to the connecting portion 11a2, the bearing portion 11a1 can serve as a reinforcing structure for the bearing member 11a, thereby improving the bending resistance of the bearing member 11a.

[0376] In some embodiments, the thickness of the supporting portion 11a1 and the connecting portion 11a2 is equal.

[0377] When the thickness of the supporting part 11a1 and the connecting part 11a2 are equal, the supporting part 11a1 and the connecting part 11a2 can be integrally formed from the same sheet metal through die casting, cold pressing, and hot pressing, making the forming of the supporting part 11a more convenient. At the same time, the equal thickness of the supporting part 11a1 and the connecting part 11a2 ensures uniform stress throughout the forming process, which can improve the forming rate of the supporting part 11a.

[0378] In some embodiments, the outer surface of the support portion 11a1 facing away from the receiving cavity 10a is parallel to the support surface 12f.

[0379] The outer surface of the support portion 11a1, which is opposite to the receiving cavity 10a, is vertically opposed to the support surface 12f. The outer surface of the support portion 11a1 can be in contact with the atmospheric environment. When the battery 100 is installed in the vehicle 1000, the planar outer surface of the support portion 11a1 can reduce the driving resistance of the vehicle 1000, reduce the driving energy consumption of the vehicle 1000, and improve the driving range of the battery 100.

[0380] In some embodiments, please refer to Figure 10 and Figure 11The main body 11 includes a frame 11b and a support member 11a. The frame 11b encloses a space 10q that is open at both ends in the vertical direction. The bottom cover 12 and the support member 11a respectively cover the opposite ends of the space 10q in the vertical direction. The bottom cover 12, the frame 11b and the support member 11a together enclose a cavity 10a.

[0381] The frame 11b itself encloses a vertically extending space 10q that extends through both ends. The support member 11a covers the top of the enclosed space 10q, and the bottom cover 12 covers the bottom of the enclosed space 10q. That is, the support member 11a is located at the top of the housing 10 and defines the receiving cavity 10a, while the bottom cover 12 is located at the bottom of the housing 10 and defines the receiving cavity 10a. The frame 11b, support member 11a, and bottom cover 12 together form the receiving cavity 10a. The frame 11b, support member 11a, and bottom cover 12 can be made of the same material, such as aluminum alloy, copper alloy, steel, or plastic. Of course, the frame 11b, support member 11a, and bottom cover 12 can also be made of different materials; there is no specific limitation. In its vertical projection, the frame 11b can be rectangular, circular, polygonal, etc., without specific limitation.

[0382] The frame 11b is parallel to the vertical direction and surrounds the battery cell 20. The frame 11b connects the support member 11a and the bottom cover 12. When the support member 11a includes the aforementioned support portion 11a1 and connecting portion 11a2, the support member 11a is connected to the frame 11b via the connecting portion 11a2. When the bottom cover 12 includes the aforementioned cover portion 12a and mounting portion 12b, the bottom cover 12 is connected to the frame 11b via the mounting portion 12b.

[0383] At this point, based on the frame 11b, the carrier 11a and the bottom cover 12 are respectively connected to the two ends of the vertical direction of the frame 11b to form the housing cavity 10a of the battery 100, and the structure of the housing 10 is relatively simple.

[0384] In some embodiments, the carrier 11a and the frame 11b are fixedly connected (e.g., detachably connected) or integrally formed. The carrier 11a and the frame 11b can be integrally formed by injection molding, die casting, forging, cold pressing, hot pressing, etc. The carrier 11a and the frame 11b can be fixedly connected by fasteners 13, snap-fit ​​structures, welding, bonding, hot-melt connection, etc.

[0385] When the support component 11a and the frame 11b are integrally formed, and the main body 11 is integrally formed, the main body 11 only needs to be connected to the bottom cover 12 to realize the assembly of the box 10, making the assembly of the box 10 convenient. When the support component 11a and the frame 11b are fixedly connected, the forming process of the support component 11a and the frame 11b is relatively easy, which can reduce the process cost of the box 10.

[0386] Understandably, when the support member 11a has a support portion 11a1 and a connecting portion 11a2, it is connected to the frame 11b by the connecting portion 11a2. When the bottom cover 12 has a cover portion 12a and a mounting portion 12b, it is connected to the frame 11b by the mounting portion 12b.

[0387] Please refer to Figure 18 and Figure 23 In some embodiments, in the vertical direction, the height Hc of the battery cell 20 and the height Hp of the battery 100 satisfy: 0.02≤Hc / Hp≤0.98.

[0388] The height Hc of the battery cell 20 refers to the maximum length of the battery cell 20 in the vertical direction when the main body 11 and the bottom cover 12 are arranged vertically. Figure 18 and Figure 19 Taking the battery cell 20 as an example, when the first outer surface m1 of the battery cell 20 is positioned opposite to the outer surface where the electrode terminal 214 is located, the maximum length of the battery cell 20 refers to the distance between the electrode terminal 214 and the first outer surface m1. Of course, when the first outer surface m1 of the battery cell 20 is adjacent to the outer surface where the electrode terminal 214 is located, the height Hc of the battery cell 20 refers to the distance between the first outer surface m1 of the battery cell 20 and the outer surface opposite to it.

[0389] The height Hp of battery 100 refers to the maximum length of battery 100 in the vertical direction z when the main body 11 and the bottom cover 12 are arranged in the vertical direction z.

[0390] Specifically, the ratio of the height Hc of the battery cell 20 to the height Hp of the battery 100 can be 0.02, 0.03, 0.05, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 0.98.

[0391] Table 5. The impact of the ratio of cell height Hc (20) to cell height Hp (100) on the safety of cell 100.

[0392]

[0393]

[0394] Table 5 shows the impact of the ratio of the height Hc of several battery cells 20 to the height Hp of battery 100 on the safety of battery 100, tested according to GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles". As can be seen from Table 5, when Hc / Hp exceeds 0.98, the structure of the casing 10 occupies a very small portion of the battery 100's height, and the strength of the casing 10 cannot meet the requirements, potentially leading to fire and explosion accidents. When 0.02 ≤ Hc / Hp, the structural strength of the casing 10 meets the requirements, and fire and explosion will not occur. When Hc / Hp is less than 0.02, although the structural strength of the casing 10 meets the requirements, the space utilization of battery 100 is low, and the energy density is too low.

[0395] Furthermore, with 0.5 ≤ Hc / Hp < 0.94, not only does the strength of battery 100 meet the requirements and prevent fire and explosion accidents, but battery 100 also has high space utilization and high energy density.

[0396] In some embodiments, please refer to Figures 24 to 28 The electrical device includes a vehicle 1000, and a battery 100 is located at the bottom of the vehicle body 200. A description of the vehicle 1000 is provided above and will not be repeated here.

[0397] The vehicle body 200 of vehicle 1000 refers to the part of vehicle 1000 used for carrying passengers and cargo, including the driver's cab, passenger compartment, engine compartment, luggage compartment, etc. The vehicle body 200 typically includes a body shell and doors, windows, trim pieces, seats, air conditioning devices, etc., mounted on the body shell. The body shell generally refers to the structure composed of the main load-bearing components of vehicle 1000, such as longitudinal beams, cross beams, chassis, and pillars, as well as the sheet metal parts connected to them. In the embodiments of this application, the battery 100 being located at the bottom of the vehicle body 200 mainly refers to the battery 100 being located at the bottom of the body shell. In this case, placing the battery 100 at the bottom of the vehicle body 200 does not occupy internal space of the vehicle body 200, helping to reduce the volume and weight of the vehicle body 200.

[0398] In some embodiments, please refer to Figure 28 The main body 11 includes a support member 11a located at the top of the box 10. The support member 11a is used to define the receiving cavity 10a. In the vertical direction, the distance L between the support member 11a and the vehicle body 200 satisfies: L≥0.

[0399] Since the battery 100 is located at the bottom of the vehicle body 200, and the support member 11a is located at the top of the housing 10, the support member 11a is closest to the vehicle body 200 within the battery 100. The distance L between the support member 11a and the vehicle body 200 refers to the distance in the vertical direction between the highest point of the support member 11a and the vehicle body 200 located above it. When the support member 11a includes the aforementioned support portion 11a1 and the aforementioned connecting portion 11a2, the distance L between the support member 11a and the vehicle body 200 is the distance between the outer surface of the support portion 11a1 facing away from the receiving cavity 10a and the vehicle body 200 located above it.

[0400] When the distance L between the support member 11a and the vehicle body 200 is 0, the support member 11a is in contact with the vehicle body 200. When the distance L between the support member 11a and the vehicle body 200 is greater than 0, the support member 11a is spaced apart from the vehicle body 200 and is not in contact. Understandably, at this time, the bottom cover 12 is located at the bottom of the support member 11a, and the distance g between the bottom cover 12 and the vehicle body 200 is greater than 0.

[0401] When the battery 100 is installed below the vehicle body 200, the area from the bottom of the battery 100 to the vehicle body 200 is the installation space occupied by the battery 100. When the support member 11a is spaced apart from the vehicle body 200, there will be some wasted space between the battery 100 and the vehicle body 200. If the support member 11a is attached to the vehicle body 200, the wasted space between the battery 100 and the vehicle body 200 can be incorporated into the space of the battery 100. Thus, with the same space occupied below the vehicle body 200, attaching the battery 100 to the vehicle body 200 can increase the volume of the battery 100, thereby increasing the battery's capacity and energy density.

[0402] At this point, when the distance L between the carrier 11a and the vehicle body 200 is zero, the battery 100 can have a large amount of charge and a high energy density, and the vehicle 1000 has a strong range. When the distance L between the carrier 11a and the vehicle body 200 is greater than zero, the installation of the carrier 11a is more flexible.

[0403] In some embodiments, please refer to Figures 24-28 The main body 11 includes a support member 11a located on top of the housing 10. The support member 11a is used to define the receiving cavity 10a, and the battery 100 is mounted on the vehicle body 200 via the support member 11a.

[0404] Since the battery 100 is located at the bottom of the vehicle body 200 and the carrier 11a is located at the top of the box 10, the carrier 11a is closest to the vehicle body 200 in the battery 100. The battery 100 is installed on the vehicle body 200 via the carrier 11a. Specifically, the carrier 11a can be fixed to the vehicle body 200 by means of fasteners 13 (such as screws, bolts, rivets, etc.), welding, etc.

[0405] When the battery cell 20 is mounted on the support member 11a, the structure formed by the battery cell 20 and the support member 11a is connected to the vehicle body 200, which can improve the top strength of the battery 100 and thus improve the installation strength of the battery 100.

[0406] In some embodiments, the carrier 11a is configured to form at least a portion of the chassis of the vehicle body 200.

[0407] The chassis, as part of the vehicle body 200, is a combination of four parts: the transmission system, the running system, the steering system, and the braking system. It is used to support and install the engine of the vehicle 1000 and its various components and assemblies, forming the overall shape of the vehicle 1000, bearing the engine power, and ensuring normal driving.

[0408] The chassis is located at the bottom of the vehicle body 200, and the carrier member 11a directly serves as at least a part of the chassis. That is, the carrier member 11a is used to form at least a part of the chassis of the vehicle body 200. In this way, by integrating the carrier member 11a with the chassis of the vehicle body 200, the space occupied by the gap between the conventional chassis and the battery 100 can be allocated to the battery 100 to increase the space of the battery 100. This helps to increase the energy of the battery 100, thereby increasing the driving range of the vehicle 1000.

[0409] According to some embodiments of this application, please refer to Figures 24-28 The electrical device includes a vehicle 1000, and a battery 100 is disposed at the bottom of the vehicle body 200. The battery 100 includes a housing 10 and battery cells 20. The housing 10 includes a support member 11a located on its top. The battery cells 20 are located inside the housing 10 and suspended on the support member 11a, and the electrode terminals 214 of the battery cells 20 are located on the outer surface of the battery cells 20 away from the support member 11a. The support member 11a forms at least a part of the chassis of the vehicle 1000.

[0410] At this time, the battery cell 20 is suspended on the support member 11a, which increases the strength of the support member 11a and thus the strength of the top of the battery cell 20, enabling the support member 11a to meet certain stress requirements when used as a chassis. Simultaneously, the electrode terminals 214 of the battery cell 20 are positioned away from the support member 11a, allowing the battery cell 20 to be directly mounted on the support member 11a. This eliminates the gap between the battery cell 20 and the support member 11a, and the saved gap is used to increase the installation space for the battery cell 20, thereby increasing the energy of the battery 100 and thus improving the driving range of the vehicle 1000.

[0411] In some embodiments, there are multiple battery cells 20, which are arranged in a second direction y, which is perpendicular to the vertical direction Z. The support member 11a is connected to the top wall 204 of the multiple battery cells 20. The top wall 204 of the battery cells 20 is parallel to the second direction y, and the vertical direction Z is perpendicular to the top wall 204 of the battery cells 20. The battery cells 20 are located below the support member 11a, so that the support member 11a and the battery cells 20 are in direct surface contact. The support member 11a is directly connected to the top wall 201 of the battery cells 20, and no space is needed in between. This can improve the space utilization of the battery 100, thereby improving the energy density of the battery 100. At the same time, the battery cells 20 and the support member 11a are connected as a whole, which can improve the structural strength of the battery 100.

[0412] As can be seen, the top wall 204 of the battery cell 20 is connected to the bottom surface of the support member 11a. The bottom surface of the support member 11a can be the side of the battery cell 20 that is close to it in the vertical direction, and the top wall 204 of the battery cell 20 can be the side of the battery cell 20 that is close to the support member 11a in the vertical direction.

[0413] The relationship between the dimension N of the support member 11a in the vertical direction Z and the weight M2 of the battery cell 20 satisfies: 0.04mm / kg≤N / M2≤100mm / kg. This ensures that the dimension N of the support member 11a in the vertical direction Z is kept within a reasonable range, avoiding excessive N that would waste internal battery space. It also makes the connection between the battery cell 20 and the support member 11a more secure, enhancing the structural strength of the battery and improving its performance.

[0414] In this design, the vertical dimension N of the support member 11a can be its thickness in the vertical direction. The support member 11a can be the battery casing cover or part of the electrical device, such as the vehicle chassis. When the support member 11a is the vehicle chassis, the battery cell 20 is connected to the support member 11a, that is, the battery cell 20 is connected to the vehicle chassis surface. Since the battery cell 20 is directly connected to the vehicle chassis surface, a battery casing cover is unnecessary, saving space and improving the battery's space utilization, thereby increasing the battery's energy density.

[0415] When N / M2 > 100 mm / kg, the vertical dimension N of the support member 11a is larger. Although this gives the battery greater structural strength, the support member 11a also occupies a larger space, resulting in a reduction in the internal space utilization of the battery, which in turn leads to a reduction in the energy density of the battery.

[0416] When N / M2 < 0.04 mm / kg, the support member 11a cannot meet the structural strength requirements of the battery. During the use of the battery, the support member 11a may deform or even break in the direction of gravity, and the battery cell 20 may also detach from the support member 11a, which may lead to safety accidents such as fire and explosion.

[0417] The test results for carriers of different sizes and battery cells of different weights are shown in Table 6.

[0418] Table 6. Test results of carriers of different sizes and battery cells of different weights.

[0419] N / mm M2 / kg N / M2 mm / kg Test Results 0.2 10 0.02 Fire, explosion 0.4 8 0.05 No fire, no explosion 0.4 1 0.4 No fire, no explosion 1 3.5 0.286 No fire, no explosion 5.5 1.5 3.667 No fire, no explosion 10 2 5 No fire, no explosion 18 2 9 No fire, no explosion

[0420] In some examples, the support element 11a may also be referred to as the mounting wall.

[0421] Optionally, the top wall 204 of the battery cell 20 can be the wall with the largest surface area of ​​the battery cell 20. In this way, the contact area between the support member 11a and the battery cell 20 is larger, which can ensure the connection strength between the support member 11a and the battery cell 20. In other embodiments, the support member 11a can also be connected to the wall with a smaller surface area of ​​the battery cell 20, and this application embodiment does not limit this.

[0422] In some alternative embodiments, the electrode terminal 214 is disposed on the bottom wall 205 of the battery cell 20, the bottom wall 205 and the top wall 204 are separated in the vertical direction and disposed opposite to each other; or, the electrode terminal 214 is disposed on the side wall of the battery cell 20, the side wall is connected to the top wall 204, and the side wall is parallel to the vertical direction.

[0423] When the battery cell 20 is in use, its vertical direction can be parallel to the direction of gravity, and the electrode terminals 214 can face the ground along the direction of gravity. For example, the battery 100 includes a support member 11a and a housing 10. The housing 10 is located below the support member 11a. The top wall 204 of the battery cell 20 faces the support member 11a and is connected to it. The bottom wall 205 of the battery cell 20 faces the bottom of the housing 10, and the electrode terminals 214 also face the bottom of the housing 10, i.e., towards the ground. In this way, the top wall 204, which does not have electrode terminals 214, can be directly connected to the support member 11a. The battery cell 20 and the support member 11a are connected as a whole, which enhances the overall structural strength of the battery 100. At the same time, there is no need to leave a gap between the top wall 201 and the support member 11a, which improves the space utilization of the battery and thus increases the energy density of the battery.

[0424] Optionally, the electrode terminal 214 can also be disposed on one of the two walls of the battery cell 20 that are disposed opposite each other along the second direction y. That is, the side wall on which the electrode terminal 214 is disposed is connected to the top wall 204, and the side wall on which the electrode terminal 214 is disposed is parallel to the vertical direction. For example, the electrode terminals 214 of the same row of battery cells 20 arranged along the second direction are also arranged along the second direction.

[0425] Optionally, the vertical dimension N of the support member 11a is 0.2mm to 20mm. Optionally, the weight M2 of the battery cell 20 is 1kg to 10kg. In this way, the vertical dimension of the support member 11a can be flexibly selected according to the weight M2 of the battery cell 20, or a suitable battery cell 20 can be selected according to the vertical dimension of the support member 11a.

[0426] Optionally, such as Figure 20 As shown, the support member 11a can be a plate-like structure, such as a flat plate. In the plate-like structure, as long as the surface that enables the support member 11a to contact the top wall 204 of the battery cell 20 is flat, there are no specific restrictions on other aspects.

[0427] Optionally, such as Figure 31 As shown, the support member 11a has a cavity 11t inside. On the one hand, the cavity 11t can provide expansion space for the battery cell 20. On the other hand, the cavity 11t can also serve as a flow channel to accommodate fluid in order to regulate the temperature of the battery cell 20.

[0428] For example, the cavity 11t is used to contain the heat exchange medium to regulate the temperature of the battery cell 20, and the carrier 11a can also be referred to as a thermal management component. Of course, in other examples, a heat exchange component can be provided between the battery cell 20 and the carrier 11. The heat exchange component can be a component with channels to serve as a thermal management component, or the heat exchange component can be formed as any other component that can regulate the temperature of the battery cell 20. This application does not impose any limitations.

[0429] Optionally, a reinforcing plate 11s may be provided inside the cavity 11t, and the reinforcing plate 11s may extend along the first direction. On the one hand, the reinforcing plate 11s can enhance the structural strength of the support member 11a. On the other hand, the reinforcing plate 11s can form multiple flow channels inside the support member 11a to accommodate the heat exchange medium. These multiple flow channels may be interconnected or independent of each other.

[0430] The heat exchange medium can be a liquid or a gas, and temperature regulation refers to heating or cooling multiple battery cells 20. When cooling the battery cells 20, the cavity 11t can contain a cooling medium to regulate the temperature of the multiple battery cells 20. In this case, the heat exchange medium can also be called a cooling medium or cooling fluid, more specifically, a coolant or a cooling gas. Alternatively, the heat exchange medium can also be used for heating; this embodiment is not limited to this. Optionally, the heat exchange medium can be circulating to achieve better temperature regulation. Optionally, the fluid can be water, a mixture of water and ethylene glycol, a refrigerant, or air, etc.

[0431] Optionally, such as Figure 32 As shown, the support member 11a is provided with a reinforcing portion 506. The support member 11a may include a first surface 504 and a second surface 505. The second surface 505 is connected to the top wall 204 of the battery cell 20. The reinforcing portion 506 is disposed on the first surface 504 and / or the second surface 505, and the reinforcing portion 506 can enhance the structural strength of the support member 11a. Optionally, the reinforcing portion 506 may be a protrusion and / or a groove formed by stamping on the support member 11a. This embodiment of the application does not limit this.

[0432] Optionally, such as Figure 33 As shown, in the vertical direction, the surface of the support member 11a away from the battery cell 20 is provided with reinforcing ribs 503; Figure 33 In the example, the surface of the support member 11a that is vertically away from the battery cell 20 can be a first surface 504, and a reinforcing rib 503 is provided above the first surface 504. The reinforcing rib 503 can enhance the structural strength of the support member 11a.

[0433] It is important to note that the vertical dimension of the reinforcing rib 503 is N3. When (N+N3) / N > 2, only the relationship between N and the weight M2 of the battery cell 20 is considered, which satisfies: 0.04mm / kg ≤ N / M2 ≤ 100mm / kg. The reinforcing rib 503 can belong to the battery or to an electrical device, such as a vehicle. The reinforcing rib 503 can be set according to the vehicle's structural strength requirements. When the vertical dimension of the reinforcing rib 503 is large, the relationship between the dimension N3 of the reinforcing rib 503 and the weight M2 of the battery cell 20 is no longer considered. Conversely, when the dimension N3 of the reinforcing rib 503 is small, for example, when (N+N3) / N ≤ 2, then (N+N3) and M2 satisfy: 0.04mm / kg ≤ (N+N3) / M2 ≤ 100mm / kg.

[0434] The number and shape of the reinforcing ribs 503 can be specifically set according to the needs of the electrical device or the battery installation method. This application embodiment does not impose specific limitations on this.

[0435] Optionally, the reinforcing rib 503 and the bearing member 11a are integrally formed, which facilitates processing and saves steps. In other embodiments, the reinforcing rib 503 and the bearing member 11a can also be formed separately and then connected or assembled by splicing, welding, bonding, machining, stamping, etc. This application does not impose specific limitations on this.

[0436] Optionally, the load-bearing member 11a can be a single-layer plate structure or a multi-layer plate structure. Compared with a single-layer plate structure, the load-bearing member 11a with a multi-layer plate structure has greater stiffness and strength.

[0437] Optionally, such as Figure 34 As shown, the support member 11a includes a first plate 51 and a second plate 52. The second plate 52 is connected to the top wall 204 of the battery cell 20, and the first plate 51 is vertically opposite to the second plate 52. The second plate 52 can be a flat plate, and the first plate 51 can be a non-flat plate. The specific configuration of the first plate 51, such as its size and strength, can be adjusted according to the specific needs of the electrical device, and this embodiment does not limit this. The support member 11a may also include a third plate, a fourth plate, etc., and this embodiment does not limit the number of plates included in the support member 11a.

[0438] exist Figure 34 In the illustrated embodiment, the dimension N of the support member 11a can be the vertical dimension of the second plate 52, and the vertical dimension of the first plate 51 can be N4. When (N+N4) / N > 2, only the following condition is considered: 0.04mm / kg ≤ N / M2 ≤ 100mm / kg between N and M2. When (N+N4) / N ≤ 2, then the following condition is considered: 0.04mm / kg ≤ (N+N4) / M2 ≤ 100mm / kg between (N+N4) and M2.

[0439] In some embodiments, the relationship between the vertical dimension N of the support member 11a and the weight M2 of the battery cell 20 also satisfies: 0.1 mm / kg ≤ N / M2 ≤ 20 mm / kg. This prevents the battery from catching fire or exploding, and better ensures battery safety while meeting the energy density requirements of the battery 100.

[0440] In some embodiments, such as Figure 35 As shown, the battery 100 also includes a reinforcing member 30. Multiple battery cells 20 are arranged sequentially along the second direction y. The reinforcing member 30 extends along the second direction y and is connected to the first wall 201 of each of the multiple battery cells 20. The first wall 201 consists of two opposite walls of the battery cell 20 along the first direction x, that is, two first walls 201 are arranged opposite each other along the first direction x. The first direction x is perpendicular to the first wall 201. The first wall 201 can be adjacent to the top wall and the bottom wall of the battery cell 20.

[0441] The reinforcing member 30 is connected to the first wall 201 of each battery cell 20, thus connecting the reinforcing member 30 and the battery cell 20 into a whole, which can improve the structural strength of the battery. In this case, side plates or beams are no longer needed inside the battery, which can maximize the utilization of internal space and improve the structural strength and energy density of the battery.

[0442] Of course, the reinforcing member 30 can also be called a partition.

[0443] Optionally, the first wall 201 can be the wall with the largest surface area of ​​the battery cell 20, which can enhance the connection strength between the reinforcing member 30 and the battery cell 20. In other embodiments, the first wall 201 can also be a wall with a smaller surface area of ​​the battery cell 20, and this application does not impose specific limitations on this.

[0444] Optionally, the battery cell 20 may further include two sidewalls disposed opposite each other along the second direction y, the sidewalls being adjacent to the top wall, bottom wall and first wall 201 of the battery cell, wherein the sidewalls of two adjacent battery cells 20 arranged along the second direction y are opposite each other.

[0445] Optionally, the dimension of the reinforcing member 30 in the first direction x is 0.1 mm to 100 mm. In this way, both the strength of the reinforcing member 30 and the energy density of the battery 10 can be taken into account.

[0446] When the size of the reinforcing member 30 in the first direction x is too small, the stiffness of the reinforcing member 30 is poor and it cannot effectively improve the structural strength of the battery 100. When the size of the reinforcing member 30 in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the size of the reinforcing member 30 in the first direction x is set to 0.1mm to 100mm. This can both ensure the energy density of the battery 100 and improve the structural strength of the battery 100.

[0447] Optionally, such as Figure 47 As shown, the reinforcing member 30 has a cavity 30a inside. This cavity 30a can provide expansion space for the battery cell 20, or it can serve as a flow channel to accommodate fluid (liquid or gas) to regulate the temperature of the battery cell. It can also reduce the weight of the reinforcing member 30 while ensuring its strength. In this case, the reinforcing member 30 can also be called a thermal management component. Optionally, structural reinforcing members can also be provided inside the cavity structure, which can both enhance the strength of the reinforcing member 30 and form multiple flow channels.

[0448] Adjusting the temperature of a single battery cell 20 refers to heating or cooling multiple single battery cells 20.

[0449] Optionally, the reinforcing member 30 can be a metal partition. In this case, an insulating layer is provided on the surface of the reinforcing member 30. The insulating layer can be an insulating film or an insulating varnish.

[0450] Optionally, the reinforcing member 30 is a non-metallic partition, that is, the reinforcing member 30 is a non-metallic insulating plate.

[0451] Optionally, the battery 10 includes multiple battery cells 20 arranged in multiple rows along the second direction y and multiple reinforcing members 30, wherein the multiple rows of battery cells 20 and multiple reinforcing members 30 are alternately arranged in the first direction x. In this way, the multiple rows of battery cells 20 and multiple reinforcing members 30 are interconnected to form a whole and housed in the casing, which can further ensure the overall structural strength of the battery 10, thereby improving the performance of the battery.

[0452] Multiple rows of battery cells 20 and multiple reinforcing members 30 are alternately arranged in a first direction. Along the first direction, they can be arranged in a battery cell-reinforcing member-battery cell manner or in a reinforcing member-battery cell-reinforcing member manner.

[0453] Optionally, such as Figure 36 and Figure 37 As shown, the battery 10 includes a plurality of battery modules 100a, each battery module 100a including at least one column of a plurality of battery cells 20 arranged along the second direction y and at least one reinforcing member 30, and the at least one column of battery cells 20 and at least one reinforcing member 30 are alternately arranged in the first direction x.

[0454] Optionally, such as Figure 37 As shown, the battery module 100a includes N rows of battery cells 20 and N-1 reinforcing members 30. The reinforcing members 30 are disposed between two adjacent rows of battery cells 20, where N is an integer greater than 1. Figure 37 In this case, N is 2. This reduces the number of reinforcing components 30 and increases the energy density of the battery 10.

[0455] For example, such as Figure 38 As shown, along the first direction x, the number of reinforcing members 30 is one less than the number of columns of battery cells 20, such as... Figure 39 As shown, the number of reinforcing members 30 is equal to the number of columns of battery cells 20, such as... Figure 40 As shown, along the first direction x, the number of reinforcing members 30 is 1 greater than the number of rows of battery cells 20.

[0456] Optionally, the battery module 100a may include N columns of battery cells 20 and N+1 reinforcing members 30, wherein the reinforcing members 30 are disposed between two adjacent columns of battery cells, and N is an integer greater than 1. Optionally, battery modules 100a with different arrangements of battery cells 20 and reinforcing members 30 can be combined to form a battery 10.

[0457] Optionally, multiple battery modules 100a are arranged along a first direction, with gaps between adjacent battery modules 100a, so that expansion space can be provided for the battery cell 20.

[0458] Optionally, such as Figure 37 As shown, the reinforcing member 30 has a fixing structure 103 at its end in the second direction y, and the reinforcing member 30 is fixed to the carrier member 11a through the fixing structure 103. The fixing structure 103 can be directly connected to the carrier member 11a, or it can be connected to the side wall of the housing 10 and then to the carrier member 11a. In this way, each battery cell 20 is fixed to the carrier member 11a by the reinforcing member 30 and the fixing structure 103, thus strengthening the fixed connection between the battery cell 20 and the carrier member 11a, connecting the entire battery 10 into a whole, and improving the structural strength of the battery 10.

[0459] Optionally, the fixing structure 103 may include a fixing plate 104. The fixing plate 104 is fixedly connected to the end of the reinforcing member 30 and to the battery cell 20 located at the end of the reinforcing member 30. For example, for a cuboid battery cell 20, the fixing plate 104 may be vertically connected to the reinforcing member 30 and connected to two adjacent sidewalls of the cuboid battery cell 20 respectively, thereby further enhancing the fixing effect on the battery cell 20.

[0460] Optionally, the fixing plate 104 may be made of the same material as the reinforcing member 30, such as metal, plastic, or composite material. The thickness of the fixing plate 104 may also be the same as that of the reinforcing member 30. The material or thickness of the fixing plate 104 may also be different from that of the reinforcing member 30. For example, the fixing plate 104 may be provided with higher strength or thickness, but this embodiment of the application is not limited in this respect.

[0461] Optionally, the connection between the reinforcing member 30 and the fixing plate 104 can be a resistance welding, resistance riveting, SPR riveting, bolt locking, or snap-fit ​​connection. The fixing plate 104 can also be fixed to the bearing member 11a by resistance welding, resistance riveting, SPR riveting, bolt locking, or snap-fit ​​connection, but this application embodiment does not limit this.

[0462] Optionally, the fixing plate 104 and the battery cell 20 can be fixedly connected by adhesive, for example, by structural adhesive, but this embodiment of the application is not limited to this.

[0463] Optionally, the fixing plate 104 includes a first connecting portion 105 extending in a first direction away from the battery cell 20, the first connecting portion 105 being used to connect the carrier member 11a. For example, taking the second surface 505 of the carrier member 11a as an example, the fixing plate 104 can extend outward in a direction away from the battery cell 20, i.e., outward, at a position close to the second surface 505, to form the first connecting portion 105, thereby connecting the second surface 505.

[0464] The first connecting part 105 can be parallel to the second surface 505 of the support member 11a. The area of ​​the first connecting part 105 can be set according to the fixing method with the side wall of the connected box 10 to meet the required fixing effect.

[0465] Optionally, the first connecting portion 105 can be formed by bending the fixing plate 104. For example, the first connecting portion 105 can be formed by bending the edge of the fixing plate 104 near the second surface 505 away from the battery cell 20. For example, the upper edge of the fixing plate 104 can be bent outward to form the first connecting portion 105. In this way, the first connecting portion 105 and the main body of the fixing plate 104 are integrally structured, thereby enhancing the connection performance.

[0466] Optionally, the fixing plate 104 further includes a second connecting portion 107 extending in a direction away from the battery cell 20 along the first direction. The second connecting portion 107 is used to connect the fixing plate 104 and the reinforcing member 30. For example, at the position where the fixing plate 104 and the reinforcing member 30 are connected, the second connecting portion 107 can be formed by extending outward in a direction away from the battery cell 20, and the fixing plate 104 is fixedly connected to the reinforcing member 30 through the second connecting portion 107.

[0467] Optionally, in addition to the connecting reinforcement 30, the second connecting part 107 can also simultaneously connect the fixing plates 104. For example, each row of battery cells 20 is provided with a fixing plate 104, and the reinforcement 30 and the two fixing plates 104 corresponding to the two rows of battery cells 20 are fixed together by the second connecting part 107.

[0468] The second connecting portion 107 can be parallel to the reinforcing member 30. The area of ​​the second connecting portion 107 can be set according to the fixing method to meet the required fixing effect.

[0469] Optionally, the reinforcing member 30 is bonded to the first wall 201. Bonding the reinforcing member 30 to the first wall 201 results in a simple structure that is easy to process and assemble.

[0470] Alternatively, the reinforcement 30 can also be clamped between adjacent rows of battery cells 20 by abutting against the first wall 201.

[0471] In some embodiments, such as Figure 11 , Figure 16 , Figure 26 , Figure 41 , Figure 43 and Figure 44 As shown, the battery cell 20 is placed upside down in the housing 10 with the end cap 212 facing the bottom wall 102 to enhance the overall rigidity of the battery and reduce the probability of damage in a collision; the end cap 212 is provided with a pressure relief mechanism 213 and an electrode terminal 214, both of which are positioned facing the bottom wall 102 to improve the safety of the battery.

[0472] For example, the battery cell 20 is placed upside down inside the housing 10 with the end cap 212 facing the bottom wall 102, which means that the battery cell 20 is vertically upside down relative to the housing 10.

[0473] Therefore, by inverting the battery cell 20 to the casing 10, the battery cell 20 can be positioned on top of the battery 100, thereby increasing the rigidity of the top of the battery 100 and enhancing its safety. Furthermore, the end cap 212 of the battery cell 20 facing the bottom of the battery 100 increases the energy density of the battery 100 and improves its usability. The electrode terminals 214 facing the bottom wall 102 provide ample space for electrical connections. The pressure relief mechanism 213 facing the bottom wall 102 allows its pressure relief direction to be directed towards the bottom of the battery 100, preventing pressure from being released to other external devices connected to the top of the battery 100 and further enhancing its safety.

[0474] Optionally, the electrode terminals 214 are disposed on both sides of the pressure relief mechanism 213; of course, the pressure relief mechanism 213 may also have other positional relationships with the electrode terminals 214.

[0475] In some embodiments of this application, such as Figure 11 , Figure 27 and Figure 41 As shown, the housing 10 includes a support member 11a and a frame 11b. The support member 11a is disposed on the top of the housing 10, and the battery cell 20 is fixedly connected to the support member 11a.

[0476] A support member 11a is disposed on the top of the housing 10, arranged vertically from top to bottom along the Z-axis with the frame 11b. The support member 11a is a plate extending horizontally to increase the rigidity of the top of the battery 100. The frame 11b is a plate extending vertically along the Z-axis, surrounding the support member 11a. An opening 10c is formed at the bottom of the housing, providing space inside the housing 10 to accommodate the battery cell 20. The battery cell 20 is fixedly connected to the support member 11a, which increases the rigidity of the top of the battery 100 and reduces the possibility of damage to the battery 100 in a collision.

[0477] Optionally, the battery cell 20 can be directly connected to the carrier 11a by adhesive bonding, or it can be fixedly connected by other means.

[0478] Optionally, the frame 11b can be integrally formed with the carrier 11a, or it can be fixedly connected to the carrier 11a by means of welding, bonding, fasteners or fusion self-tapping screws, etc. This application does not limit this.

[0479] For example, the electrode terminals 214 of the battery cell 20 are positioned facing the opening 10c of the bottom wall 102, and the end face of the battery cell 20 opposite to the electrode terminals 214 is fixed to the support member 11a. In practical applications, the battery 100 is fixed to an external device, such as inside a vehicle 1000, via the top of the housing 10. The battery cell 20 positioned on top of the battery 100 increases the rigidity of the top of the battery 100, reducing the possibility of damage to the battery 100 in a collision and increasing the safety of the battery 100. Moreover, with the electrode terminals 214 of the battery cell 20 facing the opening 10c and the side of the battery cell 20 opposite to the electrode terminals 214 fixedly connected to the top of the housing 10, the battery 100 can reserve less space for placing the battery cell 20, increasing the energy density of the battery 100, and also allowing the battery cell 20 to be better integrated with the housing 10.

[0480] In one optional embodiment, a cooling channel is embedded inside the support member 11a. Since the battery cell 20 is disposed on the support member 11a, and the top of the battery cell 2 is in contact with the support member 11a, for the sake of the performance of the battery 100, a channel is embedded inside the support member 11a, through which gas or liquid as a heat exchange medium is passed, which can regulate the temperature of the battery 100 when the battery 100 is working, thereby increasing the life and availability of the battery 100.

[0481] In another alternative embodiment, the channel may also be disposed between the battery cell 20 and the carrier 11a as a thermal management component, or formed as any other component capable of regulating the temperature of the battery 100, which is not limited in this embodiment.

[0482] In some embodiments of this application, such as Figure 11 , Figure 27 and Figure 41 As shown, the housing 10 also includes a bottom cover 12 disposed at the opening 10c, and the side frames 11b are connected to each other to form a frame structure, with the bottom cover 12 fixedly connected to the side frames 11b.

[0483] The frame 11b are interconnected to form a frame structure, that is, the frame 11b is set around the support member 11a and combined with the support member 11a to form a box 10 to accommodate the battery cell 2. The bottom cover 12 is fixedly connected to the frame 11b, thereby covering the opening 10c, so that the box 1 has a relatively sealed structure.

[0484] The bottom cover 12 includes a cover portion 12a and a mounting portion 12b. The mounting portion 12b is disposed circumferentially on the cover portion 12a and matches the frame 11b. That is, the cover portion 12a covers the opening 10c formed by the frame 11b, and the mounting portion 12b is fixed to the frame 11b, thus fixing the bottom cover 12 to the frame 11b. Optionally, the mounting portion 12b and the frame 11b can be bolted together, or other methods can be used to fix the mounting portion 12b to the frame 11b.

[0485] In the vertical direction Z, the cover portion 12a protrudes from the bottom 102 relative to the mounting portion 12b. This results in a relatively larger distance between the battery cell 20 disposed inside the housing 10 and the bottom cover 12. It should be understood that the distance of the protrusion of the cover portion 12a relative to the mounting portion 12b should be selected based on the energy density of the battery 100, and should not be too large, which would increase the volume of the battery 100 and reduce its energy density.

[0486] Of course, the cover part 12a can also be called the main body part, and the mounting part 12b can also be called the mating part.

[0487] In some embodiments, such as Figure 41 and Figure 42 As shown, the battery 100 also includes a protective component 40, which is disposed between the battery cell 20 and the bottom wall 102 to support the battery cell 20. The battery cell 20, the protective component 40, and the bottom wall 102 are arranged sequentially from top to bottom along the vertical direction Z. The protective component 40 can directly or indirectly abut against the battery cell 20 to play a supporting and load-bearing role, which can increase the structural strength of the battery 100, improve the stress performance of the battery 100, and reduce the possibility of damage to the battery 100 in a collision.

[0488] Of course, in some examples, the protective component 40 may also be referred to as the carrier component.

[0489] For example, the battery cell 20 is fixedly connected to the carrier 11a, and the protective component 40 is fixedly connected to the battery cell 20, which can play a multi-faceted role in fixing the structure of the battery 100 and improve the stability of the battery 100.

[0490] In some embodiments, such as Figure 41 As shown, the battery cell 20 is placed upside down inside the housing 10 with its end cap 212 facing the bottom wall 102. At this time, the protective assembly 40 directly or indirectly abuts against the end cap 212 of the battery cell 20. Abutting means that the two components are in direct contact with each other or are stopped by other components, but are not fixed to each other.

[0491] For example, the end cap 212 is provided with a pressure relief mechanism 213 and an electrode terminal 214, both of which are disposed toward the bottom wall 102. The protective assembly 40 supports the battery cell 20 to protect the pressure relief mechanism 213 and the electrode terminal 214.

[0492] In some embodiments, such as Figure 11 and Figure 41 As shown, the housing 10 includes a main body 11 and a bottom cover 12 disposed at the bottom of the main body 11. The bottom cover 12 is sealed to the main body 11 and together forms a closed receiving cavity 10a. The wall of the bottom cover 12 facing the battery cell 20 forms the bottom wall 102 of the receiving cavity 10a. At this time, the protective component 40 is disposed between the battery cell 20 and the bottom cover.

[0493] In some embodiments, such as Figure 11 and Figure 41 As shown, the battery cell 20 is placed upside down in the housing 10 with the end cap 212 facing the bottom wall 102. The end cap 212 is provided with a pressure relief mechanism 213 and an electrode terminal 214. The wall of the bottom cover 12 facing the battery cell 20 forms the bottom wall 102 of the receiving cavity. The protective component 40 is disposed between the battery cell 20 and the bottom cover 12, that is, between the pressure relief mechanism 213 and the electrode terminal 214 and the bottom cover 12. It is configured to support the battery cell 20 and the bottom cover 12, thereby providing protection for the pressure relief mechanism 213 and the electrode terminal 214, and playing a protective role during the collision.

[0494] In some embodiments, such as Figure 41 As shown, the battery 100 also includes a busbar component 24 for electrical connection with the electrode terminals of at least two battery cells 20. A protective component 40 is disposed between the bottom wall 102 and the busbar component 24, and the protective component 40 is used to insulate the battery cells 20 from the bottom wall 102.

[0495] Therefore, the protective component 40 is disposed between the bottom wall 102 and the busbar component 24 to support the battery cell 20. Specifically, the protective component 40 can abut against the areas of the battery cell 20 not covered by the busbar component 24 on its upper and lower sides, as well as the bottom wall 102 of the receiving cavity 10a, providing vertical support for the battery cell 20 in the Z direction. Simultaneously, the protective component 40 ensures a certain gap between the battery cell 20 and the bottom wall 102 of the receiving cavity 10a, preventing them from contacting each other. This also ensures that the busbar component connected to the battery cell 20 maintains a certain distance from the bottom wall 102 of the receiving cavity 10a, thus insulating both the busbar component and the battery cell 20 from the bottom wall 102 of the receiving cavity 10a. This prevents the exposed bottom wall 102 from being affected by external environmental interference, which could cause electrical interference to the battery cell 20 and the busbar component 24.

[0496] Furthermore, the protective component 40 can be a flat surface extending in a direction perpendicular to the vertical direction Z, thereby providing an additional protective layer on the bottom of the housing 10, further reducing the impact of the bottom wall 102 of the receiving cavity 10a on the battery cell 20 and the busbar component 24 when impacted.

[0497] In some examples, such as Figure 41 As shown, the battery cell 20 is placed upside down inside the housing 10 with the end cap 212 facing the bottom wall 102. The end cap 212 is provided with electrode terminals 214, which are electrically connected to the corresponding busbar component 24. The flat bottom surface of the battery cell 20, which is opposite to the top surface of the battery cell 20 with the electrode terminals 214, is connected to the top of the housing 10, so that the electrode terminals 214 are located on the side away from the top of the housing 10. This can effectively improve the structural strength of the top of the battery 100. Furthermore, by connecting the bottom of the battery cell 20 to the top of the housing 10, the space utilization rate inside the housing 10 can be improved, thereby increasing the overall energy density of the battery.

[0498] In this embodiment, the busbar component 24 can be a CCS (Cells Contact System) assembly, i.e., an integrated wiring harness composed of a flexible circuit board, plastic structural components, busbars, etc., used to form the required electrical connection between multiple battery cells 20, and the battery cells 20 can be charged and discharged through this busbar component. Optionally, in this embodiment, the busbar component can be welded to the electrode terminals of the battery cells 20, thereby fixing the connection between the busbar component and the battery cells 20.

[0499] Optionally, the busbar component 24 may include multiple components, each of which is connected to a battery module composed of battery cells 20, and these components are electrically connected to form the required series / parallel / hybrid connection relationship. Alternatively, the busbar component 24 may be a whole, with each battery cell 20 connected to the same component.

[0500] Optionally, the housing 10 includes a support member 11a, a frame 11b, and a bottom cover 12. The distance that the frame 11b extends in the vertical direction Z is greater than the distance that the battery cell 20, the current collector, and the protective assembly 40 extend in the vertical direction Z. In this case, the bottom cover 12 can be fitted onto the lower end of the frame 11b.

[0501] In some embodiments, such as Figure 42 As shown, the protective component 40 includes a protective strip 41 that abuts against the battery cell 20.

[0502] In some examples, the protective component 40 may also be a load-bearing component, and the protective strip 41 may also be called a protective element or a load-bearing strip. For example, the protective component 40 includes a protective element, and the load-bearing component includes a load-bearing strip.

[0503] Optionally, the protective component 40 may include a plurality of protective strips 41, which abut against a plurality of battery cells 20 respectively, so that the battery cells 20 maintain a certain distance from the bottom wall 102, thereby reducing the impact of the bottom wall 102 on the battery.

[0504] Optionally, the protective strip 41 can abut against the surface of the battery cell 20 where the electrode terminals 214 are provided. Specifically, the protective strip 41 can abut against a force-bearing area on the surface of the battery cell 20 where the electrode terminals are provided, excluding the area where the electrode terminals are located. For example, the protective strip 41 abuts against the "shoulder" on the surface located on both sides of the electrode terminals in the second direction Y. Based on this, the protective strip 41 needs to be positioned correspondingly to the battery cell 20. If there are multiple battery cells 20, and multiple battery cells 20 are arranged in an array, then there are also multiple protective strips 41. These multiple protective strips 41 are spaced apart along the second direction, and each protective strip 41 extends along the first direction, forming a parallel, spaced strip structure. Except for the protective strips 41 located at the edges, the other protective strips 41 can be positioned where adjacent battery cells 20 are joined, meaning each protective strip 41 can simultaneously abut against two adjacent battery cells 20 arranged in the second direction Y.

[0505] Optionally, the first direction X is perpendicular to the second direction Y, and the first and second directions are respectively perpendicular to the vertical direction, forming a relatively regular structure that is easy to process.

[0506] In some alternative embodiments, such as Figure 43 and Figure 44As shown, the orthographic projection of the electrode terminal 30 on the bottom wall 102 is located between the orthographic projections of the adjacent protective strips 41 on the bottom wall 102. The protective strips 41 abut against the battery cell 20. At this time, the protective strips 41 abut against the shoulder of the battery cell 20, which allows the connection between the electrode terminal and the busbar 24 to be unobstructed by the protective component 40. After the battery cell 20 is supported by the protective component 40, the electrode terminal falls between the adjacent protective strips 41, which can disperse the impact force to multiple battery cells 20 and avoid the electrode terminal from being damaged by impact.

[0507] In some embodiments, the protective strip 41 is fixedly connected to the battery cell 20 and / or the housing 10, that is, the protective strip 41 is fixedly connected to at least one of the battery cell 20 and the housing 10, so as to ensure that the protective strip 41 is reliably installed.

[0508] For example, when the protective strip 41 is fixedly connected to the housing 10, the protective strip 41 is fixedly connected to the bottom wall 102; the housing 10 includes a bottom cover 12, and the wall of the bottom cover 12 facing the battery cell 20 constitutes the bottom wall 102 of the receiving cavity 10a, then the protective strip 41 is fixedly connected to the bottom cover 12.

[0509] Optionally, the protective strip 41 is bonded to the battery cell 20 and / or the housing 10, that is, the protective strip 41 is bonded to at least one of the battery cell 20 and the housing 10, to facilitate assembly.

[0510] For example, when the protective strip 41 is bonded to the housing 10, the protective strip 41 is bonded to the bottom wall 102; the housing 10 includes a bottom cover 12, and the wall of the bottom cover 12 facing the battery cell 20 constitutes the bottom wall 102 of the receiving cavity 10a, then the protective strip 41 is bonded to the bottom cover 12.

[0511] In some optional embodiments, the plurality of protective strips 41 include an edge protective strip 411, a first protective strip 412 and a second protective strip 413. Along the second direction y, the edge protective strip 411 is disposed on the edge of the assembly composed of the arrayed battery cells 20, and the first protective strip 412 and the second protective strip 413 are alternately distributed between the two edge protective strips 411.

[0512] The protective strip 41 in this embodiment may include three types of protective elements disposed at different locations. The edge protective strip 411 is disposed at the edge of the battery cell 200, and a first protective strip 412 and a second protective strip 413 are alternately disposed between the edge protective strips 411. The first protective strip 412 and the second protective strip 413 may have different sizes to accommodate various connectors in the busbar component and to provide the necessary space for the connection between adjacent battery cells 200.

[0513] Optionally, the protective strip 41 in this embodiment may include multiple different sizes, and the size of each protective strip 41 is adjusted accordingly based on the length of the battery cell 200 and the position of the electrode terminal 214 and the pressure relief mechanism thereon. When each protective strip 41 abuts against multiple battery cells 20, each protective strip 41 may abut between two adjacent battery cells 20. At this time, the distance between the first protective strip 412 and the second protective strip 413 may be approximately the length of the battery cell 20 itself. The alternating arrangement of the first protective strip 412 and the second protective strip 413 can cooperate with the setting of the busbar component 24 to form a safe and reliable electrical connection circuit.

[0514] In some embodiments, along the first direction X, the extension length of the first protective strip 412 is greater than the extension length of the second protective strip 413.

[0515] As mentioned above, the first protective strip 412 and the second protective strip 413 in this embodiment of the application may have different lengths in their own extension direction. Through the gap between adjacent second protective strips 413, a busbar or other rigid connector can be provided to form an electrical connection between battery cells 20. The two adjacent battery cells 20 in the second direction y are electrically connected through this connector. That is, the rigid connector in the busbar component 24 can be avoided by adjusting the length of the second protective strip 413 and the spacing between adjacent second protective strips 413 in the second direction y.

[0516] Optionally, depending on the location of the connectors between the battery cells 20, the first protective strip 412 can have an extension length along the first direction X that is the same as the length of the inner cavity of the housing 10 in that direction, i.e., it extends integrally and completely inside the housing 10. Alternatively, the first protective strip 412 can have a break in the first direction X to accommodate a corresponding connector. Placing the connector in the busbar 24 at the break in the protective strip 41 ensures that the connector maintains a certain distance from the bottom wall 102, thus providing impact protection and insulation.

[0517] In some alternative embodiments, along the second direction Y, the width of the first protective strip 412 and the second protective strip 413 is greater than the width of the edge protective strip 411. Since the edge protective strip 411 is disposed at the edge of the battery cell 20 array, the edge protective strip 411 does not need to support two adjacent rows of battery cells 20 at the same time as the first protective strip 412 or the second protective strip 413 in the second direction Y, but only needs to support one row of battery cells 20. The width of the edge protective strip 411 can be smaller than that of the first protective strip 412 and the second protective strip 413, which can achieve a good support effect.

[0518] Optionally, the width of the first protective strip 412 is greater than the width of the second protective strip 413, and the width of the second protective strip 413 is greater than the width of the edge protective strip 411. In this embodiment, the protective strip 41 may include an edge protective strip 411 disposed at the edge and a first protective strip 412 and a second protective strip 413 alternately disposed between the edge protective strips 411. The edge protective strip 411 abuts only with one row of battery cells 20, therefore its width may be smaller than that of the first protective strip 412 and the second protective strip 413. The first protective strip 412 and the second protective strip 413 may be disposed at the connection point of two adjacent rows of battery cells 20, and simultaneously abut with multiple battery cells 20. By having each first protective strip 412 simultaneously abut with two adjacent battery cells 20, the required number of protective strips 41 can be reduced, thereby improving production efficiency.

[0519] Optionally, in the battery provided in this application embodiment, the width and position of each protective strip 41 in the protective component 40 can be designed according to the position and size of the portion of the battery cell 20 that overlaps with the protective component 40. Specifically, the width of the protective strip 41 can be selected based on the pressure that the battery cell 20 can withstand and the expected magnitude of the impact, and the placement position of the protective strip 41 can be selected based on the position of the electrode terminal 214 and the pressure relief mechanism.

[0520] In some alternative embodiments, the protective component 40 extends in the vertical direction Z for a length greater than 1.5 mm.

[0521] In this embodiment, the protective component 40 needs to extend a certain dimension in the vertical direction Z, that is, each protective strip 41 needs to have a certain thickness. The protective component 40 is used to provide impact protection for the battery cell 20 from below. Therefore, the relationship between the thickness of the protective component 40 itself and the impact energy has a significant impact on whether the battery will catch fire or explode. Based on this, the protective component 40 needs to have a certain basic thickness to provide corresponding protection strength. For example, the overall thickness of the protective component 40 in this embodiment can be greater than 1.5 mm.

[0522] In some embodiments, such as Figures 41-44 As shown, the pressure relief mechanism 213 of the battery cell 20 is also arranged facing the bottom wall of the receiving cavity; the protective assembly 40 includes a plurality of protective strips 41 spaced apart along the length of the housing 10. A plurality of battery cells 20 are provided, and the pressure relief mechanism 213 and the electrode terminal 214 of each battery cell 20 are located between two adjacent protective strips 41. For example, the protective strip 41 can be provided at the junction of adjacent battery cells 20 to avoid contact with the electrode terminal 214, etc., and play the role of supporting the battery cell 20.

[0523] For ease of description, in some embodiments, the length direction of the housing 10 is considered the arrangement direction of the multiple battery cells 20, i.e., the second direction, which is one of the horizontal directions. The length direction Y is perpendicular to the vertical direction Z. When the angle between the length direction Y and the vertical direction Z is between 85° and 90°, the length direction Y and the vertical direction Z can be considered perpendicular to each other. It should be understood that the length direction Y can also be other directions, and the length direction Y may not be perpendicular to the height direction Z; this application will not elaborate on these points.

[0524] Multiple protective strips 41 are spaced apart along the length direction Y, meaning that the protective components 40 are arranged along the length direction Y between multiple battery cells 20 and the bottom cover 12. As an example, the protective strips 41 can be formed into strips that protrude vertically Z from the bottom cover 12 and are fixed to the battery cells 20, such that the pressure relief mechanism 213 and the electrode terminals 214 of the battery 100 are located between two adjacent protective strips 41, thereby protecting the pressure relief mechanism 213 and the electrode terminals 214.

[0525] In some embodiments, such as Figure 42 As shown, the multiple protective strips 41 include edge protective strips 411, first protective strips 412 and second protective strips 413. Along the length direction Y, the edge protective strips 411 are disposed on both sides of the multiple battery cells 20 arranged in the array, and the first protective strips 412 and second protective strips 413 are alternately distributed between the two edge protective strips 411.

[0526] Edge protection strips 411 are positioned on both sides of the multiple battery cells 20 arranged in the array, specifically at the edges of the outermost battery cells 20 in the array, thus providing support for the battery cells 20 when they are close to the housing 10. First protection strips 412 and second protection strips 413 are alternately distributed between the two edge protection strips 411, allowing the protection strips 41 to better adapt to the array distribution of the battery cells 20, thereby providing better support for the battery cells 20.

[0527] For ease of description, in this embodiment, the width direction of the box 10 is taken as the first direction X, which is also another horizontal direction. The length direction Y, the vertical direction Z, and the width direction X are perpendicular to each other. When the angle between the length direction Y, the vertical direction Z, and the width direction X is between 85° and 90°, they can be considered to be perpendicular to each other. It should be understood that the width direction X can also be other directions, and the width direction X may not be perpendicular to the length direction Y and the vertical direction Z. This embodiment will not elaborate on these points.

[0528] In some embodiments, such as Figure 41 and Figure 42As shown, multiple battery cells 20 are electrically connected through a busbar 24. The busbar 24 spans between the electrode terminals 214 of adjacent battery cells 20 to connect the multiple battery cells 20 in series, parallel, or mixed connections. In some embodiments of this application, the busbar 24 spans between the electrode terminals 214 of adjacent battery cells 20 in the length direction Y, and at least a portion of the protective strip 41 includes a notch to avoid the busbar 24; the notch may be located at one end of the corresponding protective strip 41, or it may have other placement positions depending on the arrangement of the busbar 24, without specific limitations. Therefore, in the width direction X, the extension length of the first protective strip 412 is greater than the extension length of the second protective strip 413, causing the second protective strip 413 to avoid the busbar 24.

[0529] By making the lengths of the first protective strip 412 and the second protective strip 413 unequal in the width direction X, the protective component can avoid the current-carrying component 24, thereby making the protective component 40 better fit the structure of the battery 100, and facilitating the battery cells 20 to be connected in series, in parallel and in combination.

[0530] Optionally, when the busbar 24 is connected across the electrode terminals 214 in other directions, the dimensions of the first protective strip 412 and the second protective strip 413 may be varied depending on the specific circumstances.

[0531] Optionally, the extension length of the protective strip 41 may only indicate the total length of the protective strip 41 in the width direction X, such that the total length of the second protective strip 413 is less than that of the first protective strip 412. That is, the second protective strip 413 can avoid the busbar component 24 at any position, either at one end of the second protective strip 413 or in the middle of the second protective strip 413, depending on the arrangement of the busbar component 24.

[0532] In some embodiments, such as Figure 42 As shown, the protective component 40 also includes a main board 42, and a protective strip 41 is connected to the main board 42. The main board 42 is located between the protective strip 41 and the bottom wall 102, and the protective strip 41 is disposed on the surface of the main board 42 facing the top of the housing 10.

[0533] Of course, the motherboard 42 can also be called a connection board.

[0534] Optionally, there are multiple protective strips 41, all of which are disposed on the surface of the main board 42 facing the top of the housing 10, with the main board 42 positioned close to the bottom wall 102. The main board 42 ensures the relative position of the multiple protective strips 41 is stable, preventing misalignment after impact.

[0535] The main board 42 can extend and abut against the bottom wall 102 in the same direction. It can also be further limited by the grooves provided on the bottom wall 102. The main board 42 is located between the protective strip 41 and the bottom wall 102 and extends to cover a large area, thereby improving the insulation performance between the busbar component 24 and the battery cell 20 and the bottom wall of the housing 10.

[0536] Alternatively, to provide the required protection strength, the thickness of the motherboard 42 can be greater than 0.5 mm.

[0537] Optionally, the motherboard 42 is fixedly connected to the bottom wall 102 to facilitate the reliable installation of the motherboard 42 and increase the structural robustness of the battery 100; for example, the motherboard 42 is glued and fixed to the bottom wall 102 to facilitate assembly.

[0538] Optionally, the motherboard 42 may also abut against the bottom wall 102, and this embodiment of the application does not limit this.

[0539] In some embodiments, the motherboard 42 and the protective strip 41 are integrally formed or detachably connected to facilitate the processing of the motherboard 42 and the protective strip 41. When the protective strip 41 and the motherboard 42 are integrally formed, the manufacturing of the protective component 40 is facilitated. When the protective strip 41 and the motherboard 42 are detachably connected, the position of the protective strip 41 can be easily adjusted according to the arrangement of the battery cells 20, making the protective component 40 applicable to a wider range of scenarios.

[0540] In some optional embodiments, the protective component 40 is bonded and fixed to the battery cell 20. In this embodiment, the protective component 40 abuts against the shoulder of the battery cell 20, whereby the two can be bonded and fixed, further improving the overall strength and connection stability, and preventing misalignment between the protective component 40 and the battery cell 20 due to impact. Optionally, each protective strip in the protective component 40 can be bonded to a corresponding position on the battery cell 20, or at least some of the protective strips can be bonded to the battery cell 20, which may include edge protective strips 411.

[0541] In some embodiments, such as Figure 18 As shown, the end cap 212 includes a functional area 206 and a shoulder 207. The functional area 206 is provided with electrode terminals. The shoulder 207 is located on both sides of the functional area 206 along the second direction y. The battery cell 20 abuts against the protective strip 41 through the shoulder 207. The second direction y is perpendicular to the vertical direction.

[0542] Of course, end cap 212 can also be called top cap plate.

[0543] Functional area 206 indicates the area on the end cap 21 where the battery cell 20 can perform its own function, or where the battery cell 20 can interact with the outside world, such as the electrode terminals that allow the battery cell 20 to be electrically connected to the outside world. Since functional area 206 often houses electrode terminals or other functional components, it should not be subjected to stress during the use of the battery 100. Shoulder 207 indicates the area on the end cap 21 other than functional area 206 that can bear stress.

[0544] The functional area 206 is positioned between the shoulders 207, which allows the shoulders 207 to provide a certain degree of protection for the functional area 206. This allows the battery cell 20 to abut against the protective strip 41 via the shoulders 207, resulting in a more compact structure for the battery 100, preventing damage to the functional area 206 due to stress, and extending the lifespan of the battery cell 20.

[0545] Optionally, the protective strip 41 is fixedly connected to the shoulder 207.

[0546] In some embodiments, electrode terminals are disposed between two adjacent protective strips 42, and electrode terminals 214 are spaced apart from bottom wall 102 (e.g., bottom cover 12).

[0547] Since the functional area 206 is located between two shoulders 207, which overlap the protective strip 41, the electrode terminals 214 of the functional area 206 are also located between two adjacent protective strips 42. The electrode terminals 214 are spaced apart from the bottom wall 102, meaning that the electrode terminals 214 do not contact the bottom wall 102. The electrode terminals 214 can be considered as suspended between the two protective strips 42, so as to draw out the electrical energy of the battery cell 20 through the electrode terminals 214, thereby improving the availability of the battery cell 20.

[0548] Optionally, if the pressure relief mechanism and the electrode terminal of the battery cell 20 are located on the same side of the battery cell 20, then the pressure relief mechanism 213 is also located facing the bottom wall 102. The functional area 206 is provided with the pressure relief mechanism 213 and the electrode terminal 214. Within the functional area 206, the electrode terminal 214 can be located on both sides of the pressure relief mechanism 213 to reduce the impact of the pressure relief mechanism 213 on the electrode terminal 214 when the pressure is released.

[0549] In some embodiments, such as Figure 44 As shown, in the vertical direction (e.g., the thickness direction of the motherboard), the thickness of the protective strip 41 is greater than the extension height of the portion of the electrode terminal 214 exposed in the battery cell 20, which allows the electrode terminal 214 to be suspended between adjacent protective strips 41, avoiding contact with other components and affecting its function.

[0550] In some embodiments of this application, such as Figure 43 and Figure 44As shown, the shoulders 207 of two adjacent battery cells 20 overlap the same protective strip 41.

[0551] In the housing 10, one battery cell 20 or multiple battery cells 20 can be set. When multiple battery cells 20 are set in the housing 10, the multiple battery cells 20 are arranged adjacent to each other in the housing 10. Since the protective strip 41 is set at intervals along the main board 42 in the first direction x, the shoulder 207 is located on both sides of the functional area 206 in the first direction x, so that the shoulder 207 is located at the junction of adjacent battery cells 20, so that the shoulder 207 of two adjacent battery cells 20 can overlap the same protective strip 41.

[0552] This allows adjacent battery cells 20 in the first direction x to share the same protective strip 41, thereby minimizing the number of protective strips 41 and facilitating the manufacture of the protective assembly 40.

[0553] In some embodiments of this application, such as Figure 18 and Figure 42 As shown, in the first direction x, the width D11 of the protective strip 41 (e.g., the width D1 of the edge protective strip 4111, the width D2 of the first protective strip 412, and the width D3 of the second protective strip 413 in this application) and the extension width D4 of the shoulder 207 satisfy: 0.5D4≤D11≤2D4.

[0554] When the width D11 of the protective strip 41 is greater than or equal to 0.5 times the extension width D4 of the shoulder 207, it can provide sufficient support for the battery cell 20. When the protective strip 41 supports two adjacent battery cells 20 at the same time, the width of the protective strip 41 in the second direction Y is less than or equal to twice the extension width of the shoulder 207, so that the protective strip 41 only contacts the shoulders 207 of the two adjacent battery cells 20, and avoids contact with the functional area 206, which would affect the function of the battery cell 20.

[0555] Preferably, the relationship between the width D11 of the protective strip 41 and the extension width D4 of the shoulder 207 satisfies D4≤D11≤2D4. Since the protective strip 41 may be offset between adjacent battery cells 20, the width of the protective strip 41 in the length direction Y is greater than or equal to the extension width of the shoulder 207. This allows the protective strip 41 to simultaneously support two adjacent battery cells 20, without the problem that the battery 100 can only support one due to offset, resulting in poor structural stability due to uneven stress.

[0556] In some embodiments, the protective strip 41 abuts against the electrode terminal 214, or the protective strip 41 is spaced apart from the electrode terminal 214. This facilitates flexible arrangement of the protective strip 41.

[0557] In some embodiments, such as Figure 18 , Figure 43 and Figure 44 As shown, the orthographic projection of electrode terminal 214 on bottom wall 102 lies between the orthographic projections of adjacent protective strip 41 on bottom wall 102.

[0558] The protective component 40 in this embodiment includes multiple protective strips 40 that abut against the battery cell 20. The orthographic projection of the electrode terminal 30 in the battery cell 20 onto the bottom wall can be located between adjacent protective strips. In this case, the protective strip 41 abuts against the shoulder of the battery cell 20, which allows the connection between the electrode terminal 214 and the busbar 24 to be unobstructed by the protective component 40. After the battery cell 20 is supported by the protective component 40, the electrode terminal 30 falls between adjacent protective strips 41, which can disperse the impact force to multiple battery cells 20 and prevent the electrode terminal 30 from being damaged by impact.

[0559] In some embodiments, such as Figure 41 and Figure 42 As shown, the electrode terminals 214 of two adjacent battery cells 20 are electrically connected through the busbar 24. In the second direction y, the extension length of one of the two adjacent protective strips 41 is less than the extension length of the other to form a clearance notch 43, which is used to avoid the busbar 24.

[0560] The busbar component 24 is a component that enables electrical connection between multiple battery cells 20. The busbar component 24 is connected across the electrode terminals 214 of adjacent battery cells 20 to connect multiple battery cells 20 in series, parallel, or mixed connections. Since the busbar component 24 is connected across the electrode terminals 214 of adjacent battery cells 20 in the second direction Y, at least a portion of the protective strip 41 extending along the first direction X needs to avoid it to form a clearance notch 43.

[0561] In a pair of adjacent protective strips 41, one strip has a shorter extension length than the other, meaning that the longer and shorter protective strips 41 are alternately distributed. Optionally, the length of the protective strips 41 can be adjusted according to the arrangement of the busbar component 24. Furthermore, the extension length of the protective strips 41 in the first direction X indicates only the total length of the protective strips 41 in the first direction X. That is to say, the clearance notch 43 can be provided at one end of the protective strip 41 or in the middle of the protective strip 41, depending on the arrangement of the busbar component 24. This embodiment does not impose any special restrictions on this.

[0562] By providing an avoidance notch 43 in the protective strip 41, the protective component 40 can be better adapted to the structure of the battery 100, making it easier for the battery cells 20 to be connected in series, in parallel, or in a mixed configuration.

[0563] In some alternative embodiments, such as Figure 18 As shown, the battery cell 20 also includes a pressure relief mechanism 213. The pressure relief mechanism 213 is disposed on the same side as the electrode terminal 214. By also placing the pressure relief mechanism 213 on the lower side of the battery cell 20, it can protect both the battery cell 20 and the electrode terminal 214, preventing them from colliding with the casing 10 and improving the overall safety and reliability of the battery 100.

[0564] Optionally, the pressure relief mechanism 213 is spaced apart from the bottom wall 102. In the second direction y, the electrode terminals 214 are disposed on both sides of the pressure relief mechanism 213, which can reduce the impact of the pressure relief mechanism 213 on the electrode terminals 214 during pressure relief. Furthermore, the pressure relief mechanism 213 is spaced apart from the bottom wall 102, meaning that the pressure relief mechanism 213 does not contact the bottom wall 102, thereby providing a larger pressure relief space for the pressure relief mechanism 213, reducing the risk of emissions, and improving the safety of the battery 100.

[0565] In some alternative embodiments, such as Figure 18 , Figure 43 and Figure 44 As shown, the orthographic projection of the pressure relief mechanism 213 onto the bottom wall 102 lies between the orthographic projections of the adjacent protective strips 41 onto the bottom wall 102. When the battery cell 20 is coupled with the protective assembly 40, the pressure relief mechanism 213 can be positioned between the areas where the adjacent protective strips 41 and the battery cell 20 abut against each other. That is, the pressure relief mechanism 213 is positioned on the side closer to the bottom wall 102 and does not contact the protective assembly 40. This allows the impact force to be dispersed to the shoulder of the battery cell 20 when subjected to external impact, preventing the pressure relief mechanism 213 from being damaged by collision, thereby improving the safety of the battery 100.

[0566] In some embodiments, such as Figure 42 As shown, along the length direction Y, the width D1 of the edge protection strip 411, the width D2 of the first protection strip 412, the width D3 of the second protection strip 413, and the width D4 of the shoulder 207 satisfy: 0.2D4≤D1≤D4, 0.5D4≤D2≤2D4, and 0.5D4≤D3≤2D4.

[0567] Since the edge protection strip 411 is located at the edge of the battery cell 20 array, the edge protection strip 411 only contacts one side shoulder 207 of the edge battery cell 20 in the length direction Y. This makes the width D1 of the edge protection strip 411 less than or equal to the width D4 of the shoulder 207, which can prevent the edge protection strip 411 from contacting the functional area 206 and affecting the function of the battery cell 20. This also makes the width D1 of the edge protection strip 411 greater than or equal to 0.2 times the width D4 of the shoulder 207, so that the edge protection strip 411 can provide sufficient support for the battery cell 20.

[0568] Since the first protective strip 412 is disposed between adjacent battery cells 20, its width D2 is greater than or equal to 0.5 times the extension width D4 of the shoulder 207, thus providing sufficient support for the battery cells 20. Preferably, when the width D2 of the first protective strip 412 is greater than or equal to the extension width D4 of the shoulder 207, the first protective strip 412 can simultaneously support two adjacent battery cells 20, without the problem of only supporting one due to offset, leading to poor structural stability of the battery 100 due to uneven force. The width D2 of the first protective strip 412 is less than or equal to twice the width D4 of the shoulder 207, ensuring that when the first protective strip 412 simultaneously supports two adjacent battery cells 20, it only contacts the shoulders 207 of the two adjacent battery cells 20, avoiding contact with the functional area 206 and affecting the function of the battery cells 20.

[0569] Similar to the first protective strip 412, the width D3 of the second protective strip 413 can be greater than or equal to 0.5 times the extension width D4 of the shoulder 207, and less than or equal to 2 times the width D4 of the shoulder 207.

[0570] In some embodiments, such as Figure 41 and Figure 42 As shown, the protective assembly 40 also includes a main board 42, which is disposed between the protective strip 41 and the bottom wall 102 to absorb and disperse external impact forces in the horizontal direction. The protective strip 41 protrudes vertically from the main board 42 and can form a protrusion. For example, the housing 10 includes a bottom cover 12, and the wall of the bottom cover 12 facing the battery cell 20 is formed as the bottom wall 102. In this case, the main board 42 is disposed between the protective strip 41 and the bottom cover 12.

[0571] By setting the mainboard 42, multiple protective strips 41 in the protective assembly 40 can be combined into a whole. Furthermore, by setting the mainboard 42 extending along the length direction Y, the force on the protective assembly 40 can be dispersed to increase the structural strength of the battery 100.

[0572] In some examples, the protective component 40 may also be referred to as the carrier component, and the protective strip 41 may also be referred to as the carrier strip. In this case, the carrier component includes the motherboard and the carrier strip.

[0573] Optionally, to avoid affecting the electrical connections between battery cells 20, the protective component 40 can be an insulating element. It is understood that "insulating element" indicates that the protective component 40 can be made entirely of insulating material, or it can be an object whose surface is covered with an insulating material (e.g., an insulating coating) to provide overall insulation. When the protective component 40 is an object covered with an insulating material, the core material can be made of metal, insulating material, or composite material, etc., with the outer surface of the core material covered with an insulating material. Meanwhile, the protective strip 41 and the main board 42 should have a certain degree of hardness and elasticity to provide support for the battery cells 20 while also being able to deform to a certain extent when subjected to impact, thus protecting the battery cells 20.

[0574] Optionally, the protective strip 41 and the main board 42 can be integrally formed to facilitate the manufacturing of the protective component 40. The protective strip 41 and the main board 42 can also be detachably connected to each other to adjust the position of the protective component 40 according to the arrangement of the battery cells 20, so that the protective component 40 can have a wider range of application scenarios.

[0575] In some embodiments, the motherboard 42 is fixedly connected to the bottom cover 12 to increase the structural robustness of the battery 100. Optionally, the motherboard 42 may also abut against the bottom wall 102, for example, the motherboard 42 abuts against the bottom cover 12; this embodiment of the application does not limit this.

[0576] In some embodiments, such as Figure 16 As shown, there is a first distance H1 between the end cap 212 of the battery cell 2 and the bottom wall 102, and the first distance H1 satisfies 2mm < H1 < 30mm. When the wall of the bottom cover 12 facing the battery cell 20 is formed as the bottom wall 102, the distance between the end cap 212 of the battery cell 20 and the bottom cover 12 is also the first distance H1.

[0577] When the cover portion 12a of the bottom cover 12 protrudes from the bottom extension surface of the housing 10 relative to the mounting portion 12b, the first distance H1 indicates the distance between the side of the battery cell 20 having the electrode terminals and the pressure relief mechanism and the cover portion 12a in the vertical direction Z. The first distance H1 satisfies 2mm < H1 < 30mm, and preferably, the first distance H1 satisfies 5mm ≤ H1 ≤ 20mm. Within this range, it is possible to ensure that the battery 100 has a suitable volume, so that the battery 100 has good discharge performance.

[0578] In some embodiments, the ratio of the first distance H1 to the weight M2 of a single battery cell 20 satisfies 0.2 mm / Kg < H1 / M2 < 50 mm / Kg.

[0579] The ratio H1 / M2, representing the first distance H1 to the weight M2 of a single battery cell 20, indicates the energy density and structural strength of the battery 100. If this ratio is too large, the battery 100 will have an excessively low energy density; conversely, if it is too small, the battery 100 will lack structural strength, potentially leading to a safety accident in a collision. Therefore, H1 / M2 should satisfy 0.2 mm / kg < H1 / M2 < 50 mm / kg. Preferably, H1 / M2 should satisfy 0.5 mm / kg ≤ H1 / M2 ≤ 20 mm / kg. Within this range, the battery 100 exhibits good energy density and suitable structural strength.

[0580] To verify that the battery 100 has good performance when the ratio H1 / M2 of the first distance H1 to the weight M2 of a single battery cell 20 is within a suitable range, the battery 100 is, by way of example, subjected to a collision test using a collision test apparatus A. Figure 45 As shown, the collision testing device A includes an impact head A1, a launching device A2, and a frame A3. During the test, the battery 100 is placed on the frame A3, so that the impact head A1, driven by the launching device A2, impacts the battery 100 at a certain speed. The test conditions can be selected as follows: the impact direction is vertical (Z), the impact location is the weakest point of the battery 100, and the impact energy is 90J.

[0581] Since battery 100 is used in electrical devices such as vehicle 1000, and is mounted on the top of vehicle 1000 via housing 10, impacting the bottom of battery 100 in a vertical Z direction can simulate the scenario after battery 100 is installed in vehicle 1000. The weak point of battery 100 indicates the location where battery 100 is easily damaged; this point is typically within a 240mm radius of the geometric center of battery 100. Impacting the weak point of battery 100 can simulate the state of battery 100 after being impacted at a location with weak structural strength. The impact energy is 90J, which can be equivalent to impact head A1 impacting battery 100 at a speed of 4.2m / s. It is understood that other impact energies can also be used to impact battery 100, such as 120J (impact speed 4.9m / s) or 150J (impact speed 5.5m / s). In actual experiments, the battery 100 can be impacted multiple times with a single impact energy, or multiple impact energies can be used to impact the battery 100 multiple times.

[0582] After the battery 100 is impacted by the collision test device A, it is observed at ambient temperature for 2 hours to detect whether the battery 100 catches fire or explodes. Optionally, after the battery 100 is impacted by the collision test device A, the battery 100 can also be tested for its casing protection level, etc., and this application embodiment does not limit this.

[0583] Table 7 shows the test results of the collision test conducted on the battery 100 using the above method when the first distance H1, the weight M2 of a single battery cell 20, and the value of H1 / M2 are used respectively.

[0584] Table 7

[0585] H1(mm) M2 (mm) H1 / M2 (mm / Kg) crash test Example 1 5 10 0.5 No fire, no explosion Example 2 10 5 2 No fire, no explosion Example 3 15 3 5 No fire, no explosion Example 4 20 2 10 No fire, no explosion Example 5 25 1 25 No fire, no explosion Comparative Example 1 2 10 0.2 Fire, explosion Comparative Example 2 30 1 30 Fire, explosion Comparative Example 3 25 0.5 50 Fire, explosion

[0586] As shown in Table 7, when 2mm < H1 < 30mm and H1 / M2 satisfies 0.2mm / Kg < H1 / M2 < 50mm / Kg, the battery 100 will not catch fire or explode in a collision test of a certain intensity, and has good safety.

[0587] In some embodiments, such as Figure 42 As shown, in the height direction Z (i.e., the vertical direction) of the housing 1, the extension height of the protective strip 41 is the second distance N6, and the second distance N6 satisfies 0.5mm≤N6≤30mm.

[0588] The protective strip 41 has a certain dimension in the height direction Z, allowing it to protrude from the motherboard 42 and support the battery cell 20. The second distance N6 is set so that the end cap 212 of the battery cell 20 is kept at a certain distance from the bottom wall 102, thereby maintaining a moderate energy density of the battery 100.

[0589] The ratio N6 / M2 of the second distance N6 to the weight M2 of a single battery cell 20 indicates the energy density and structural strength of the battery 100. If this ratio is too large, the energy density of the battery 100 will be too low; if it is too small, the structural strength of the battery 100 will be insufficient, leading to a safety accident in a collision. Therefore, the ratio N6 / M2 should satisfy 0.05 mm / Kg ≤ N6 / M2 ≤ 50 mm / Kg. Within this range, the battery 100 has good energy density and suitable structural strength.

[0590] To verify that the battery 100 has good performance when the ratio N6 / M2 of the second distance N6 to the weight M2 of a single battery cell 20 is within a suitable range, a structural strength test can be performed on the battery 100. During the structural strength test of the battery 100, for example, the structural strength can be determined through multiple tests such as shear strength test and compressive strength test.

[0591] In a shear strength test, for example, the battery 100 can be fixed between the clamps of a shear testing machine. Then, the testing head of the shear testing machine moves the battery 100 at a speed of 5 mm / min along the length direction Y or the width direction X. When the housing 1 is damaged, the tensile force F applied by the testing head is recorded. Taking the projected area of ​​the battery 100 in the height direction Z as area A, the value of F / A is the shear strength that the battery 100 can withstand.

[0592] In the compressive strength test, for example, pressure can be applied to the battery 100 in the height direction Z and the length direction Y or the width direction X using an extrusion head, and the extrusion head can be pushed into the battery 100 at a speed of 2 m / s. The extrusion is stopped when the extrusion pressure reaches 50 kN or the deformation of the battery 100 reaches 30%, and the pressure is maintained for 10 minutes. After the compressive strength test, the battery 100 is left to stand at ambient temperature for 2 hours for observation.

[0593] Optionally, the structural strength of the battery 100 can also be tested through other structural strength tests, which are not limited in this embodiment.

[0594] Table 8 shows the test results of the structural strength of the battery 100 using the above method when the battery cell 20 is fixed to the protective strip 41, with different values ​​for the second distance N6, the weight M2 of the single battery cell 20, and the value of N6 / M2.

[0595] Table 8

[0596] N6 (mm) M2 (Kg) N6 / M2(mm / Kg) Structural strength Example 6 0.5 10 0.05 better Example 7 5 5 1 better Example 8 10 4 2.5 good Example 9 10 2 5 good Example 10 20 1 20 excellent Example 11 30 0.6 50 excellent Comparative Example 4 0.5 5 0.04 Difference Comparative Example 5 52 1 52 Difference

[0597] As shown in Table 8, when N6 satisfies 0.5mm≤N6≤30mm and N6 / M2 satisfies 0.05mm / Kg≤H2 / M≤50mm / Kg, battery 100 has good structural strength in the strength structure test.

[0598] In some embodiments, such as Figure 42 and Figure 44 As shown, in the vertical direction, the thickness of the protective strip 41 is the second distance N6. Since the cover portion 12a of the bottom cover 12 protrudes from the extension surface of the bottom wall 102 relative to the mounting portion 12b, the vertical distance between the cover portion 12a and the mounting portion 12b is the fourth dimension D8. The protective assembly 40 is disposed between the battery cell 20 and the bottom cover 12. The protective assembly 40 may have a shape that matches the cover portion 12a, and the vertical dimension of the main board 42 is the sixth dimension D10.

[0599] To ensure that the battery 100 has suitable energy density and structural strength, the sum of the second distance N6 and the sixth dimension D10 should not be less than the fourth dimension D8, that is, N6 + D10 ≥ D8. In other words, in the first direction X, the overall size of the protective component 40 should be greater than the distance difference between the cover 12a and the mounting part 12b. In this way, the protective component 40 is fixed to the battery cell 20, so that the battery cell 20 and the cover 12a of the bottom cover 12 are kept at a distance, and sufficient space is reserved for the pressure relief mechanism 213 to eject when the pressure relief mechanism 213 and the electrode terminal 214 are both facing the bottom cover 12.

[0600] In some alternative embodiments, the protective component 40 abuts against the battery cell 20, where the second distance N6 satisfies 5mm≤N6≤30mm, and the ratio of the second distance N6 to the weight M2 of a single battery cell 20, N6 / M2, satisfies 0.5mm / Kg≤N6 / M2≤50mm / Kg. Preferably, 1mm / Kg≤N6 / M2≤30mm / Kg. Within this range, the battery has good energy density and suitable structural strength.

[0601] Table 9 shows the test results of the collision test on the battery 100 using the above-described collision test method when the protective component 40 comes into contact with the battery cell 20, with different values ​​for the second distance N6, the weight M2 of the single battery cell 20, and the value of N6 / M2.

[0602] Table 9

[0603] No. N6 (mm) M2 (Kg) N6 / M2(mm / Kg) crash test Example 12 5 10 0.5 No fire, no explosion Example 13 10 5 2 No fire, no explosion Example 14 15 3 5 No fire, no explosion Example 15 30 1 30 No fire, no explosion Example 16 25 0.5 50 No fire, no explosion Comparative Example 7 3 2 0.2 Fire, explosion Comparative Example 8 52 1 52 Fire, explosion

[0604] As shown in Table 9, when N6 satisfies 5mm≤N6≤30mm and N6 / M2 satisfies 0.5mm / Kg≤N6 / M2≤50mm / Kg, the battery 100 will not catch fire or explode in a collision test of a certain intensity, and has good safety.

[0605] In some embodiments, such as Figure 24 and Figure 25 As shown, the battery 100 also includes a connecting plate 91 and a connector 92. The connecting plate 91 is provided on one side of the housing 10 and protrudes in the horizontal direction (e.g., the second direction y). The connecting plate 91 and the bottom wall 102 form a receiving portion 911 in the vertical direction. The connector 92 is disposed in the receiving portion 911 and connected to the connecting plate 91. The connector 92 is electrically connected to the battery cell 20.

[0606] Of course, the connecting board 91 can also be called an adapter board, and the connector 92 can also be called an adapter.

[0607] like Figure 24 and Figure 25As shown, the connecting plate 91 is a boss extending from one side of the housing 10 along the second direction y. It has a thickness difference with the bottom wall 102 of the housing 10 in the vertical direction z. The receiving portion 911 is the space created by this thickness difference, formed by the connecting plate 91 and the side of the housing 10 that is in contact with it, for the connector 92 to be housed therein. Placing the connector 92 in the receiving portion 911 protects the connector 92 and reduces the impact force it receives during collisions.

[0608] Battery 100 is electrically connected to an external device via connector 92. Therefore, connector 92 needs to be electrically connected to battery cell 20. This means that connector 92 is electrically connected to battery cell 20 through a current path provided inside connector plate 91 in order to obtain electrical energy from battery cell 20 inside housing 10 to power external electrical devices.

[0609] The intersection of the horizontal and vertical directions means that the connecting plate 91 can form a certain angle with the extension direction of the housing 10, but it cannot be parallel to the housing 10, so that the connector 92 can be provided in the receiving portion 911 between the connecting plate 91 and the housing 10. In the embodiments of this application, for ease of explanation, the example of the horizontal and vertical directions being perpendicular is taken; alternatively, the horizontal and vertical directions may not be perpendicular.

[0610] In some embodiments, the connector 92 does not extend beyond the vertical extension surface of the bottom wall 102. This ensures that the connector 92 is completely contained within the receiving portion 911, preventing contact with external devices located circumferentially to the battery 100 and reducing the impact on the connector 92 during the electrical connection of the battery cell 20 to the external device.

[0611] In some embodiments, the bottom wall of the housing 10 has an opening 10c, and the housing 10 also includes a frame 11b distributed around the opening 10c. The frame 11b are connected to each other to form a frame structure, and the connecting plate 91 is integrally formed with the frame 11b.

[0612] In the housing 10, the frame 11b and the support member 11a are arranged vertically from top to bottom. The frame 11b is a plate extending vertically and surrounds the support member 11a, while an opening 10c is formed at the bottom of the housing 10, so that the interior of the housing 10 has space to accommodate the battery cell 20. The connecting plate 91 extends from one side of the frame 11b and is integrally formed with the frame 11b, which can increase the stress strength of the connecting plate 91.

[0613] Optionally, the connecting plate 91 may not be integrally formed with the frame 11b, but may be fixedly connected to the frame 11b by at least one of the following processes: welding, bonding, fasteners, or hot-melt self-tapping screws. Similarly, the connecting plate 91 and the carrier 11a, and the frame 11b and the carrier 11a, may also be integrally formed, or fixedly connected by the above methods. This application embodiment does not impose any limitations on this.

[0614] In some embodiments of this application, such as Figure 24 and Figure 25 As shown, the surface of the connecting plate 91 facing the receiving portion 911 is the first protective surface 911a, the surface of the frame 11b facing the receiving portion 911 is the second protective surface 911b, the connector 92 is connected to the first protective surface 911a, and the connector 92 and the second protective surface 911b are spaced apart.

[0615] In other words, the first protective surface 911a is the side surface of the connecting plate 91 facing away from the top of the housing 10, and the second protective surface 911b is the side surface of the frame 11b of the housing 10 close to the connecting plate 91. The first protective surface 911a and the second protective surface 911b are joined to form the receiving portion 911. The connector 92 extends vertically from the first protective surface 911a, thereby extending out of the receiving portion 911 and not contacting the second protective surface 911b, so as to reduce the impact that the connecting plate 91 may suffer in a collision.

[0616] Optionally, the first protective surface 911a and the second protective surface 911b can be connected perpendicularly to each other, that is, the first protective surface 911a extends along the second direction (the arrangement direction of the plurality of battery cells 20), and the second protective surface 911b extends along the vertical direction, so that the first protective surface 911a and the second protective surface 911b are perpendicular to each other, thereby increasing the installation space of the connector 92 and maximizing the accommodating portion 911.

[0617] In some embodiments, such as Figure 24 and Figure 25 As shown, in the vertical direction z, the thickness of the connecting plate 91 is the first dimension D5, the extension height of the connector 92 is the second dimension D6, and the extension height of the frame 11b is the third dimension D7. The sum of the first dimension D5 and the second dimension D6 is not greater than the third dimension D7, that is, D5 + D6 ≤ D7. This ensures that the connector 92 is completely located within the receiving portion 911, thus protecting the connector 92.

[0618] In some alternative embodiments, connector 92 may extend vertically in the Z direction and face the extension surface of the bottom wall 102 of housing 10. This structure facilitates electrical connection between connector 92 and external devices, and provides better load-bearing performance compared to connector 92 arranged in the horizontal direction.

[0619] In some embodiments, such as Figure 11 , Figure 26 and Figure 27 As shown, the housing 10 also includes a bottom cover 12 disposed at the opening 10c, and the bottom cover 12 is connected to the frame 11b. The bottom cover 12 covers the opening 10c, giving the housing 100 a relatively sealed structure. The bottom cover 12 includes a cover portion 12a and a mounting portion 12b, the mounting portion 12b being disposed circumferentially on the cover portion 12a and matching the frame 11b. That is, the cover portion 12a covers the opening 10c formed by the frame 11b, and the mounting portion 12b is fixed to the frame 11b, connecting the bottom cover 12 to the frame 11b.

[0620] In the vertical z-direction, the cover portion 12a protrudes from the extension surface of the bottom wall 102 relative to the mounting portion 12b, resulting in a relatively larger distance between the battery cell 20 disposed inside the housing 10 and the bottom cover 12. This allows space for the busbar component 24 or other components between the electrode terminals 214 of the battery cell 20, preventing the bottom cover 12 from being too close to the electrode terminals 214 of the battery cell 20. It should be understood that the protrusion distance of the cover portion 12a relative to the mounting portion 12b should be selected based on the energy density of the battery 100, and should not be too large, which would increase the volume of the battery 100 and reduce its energy density.

[0621] Furthermore, when the pressure relief mechanism 213 is positioned towards the bottom wall of the receiving cavity 10a, it can also be positioned towards the opening 10c. In the event of thermal runaway of the battery cell 2, the pressure relief mechanism 213 ejects towards the bottom cover 12. At this time, the structure of the cover portion 12a protruding from the mounting portion 12b relative to the extension surface of the bottom 102 allows the pressure relief mechanism 213 to have a larger ejection space. Moreover, the pressure relief mechanism 213 ejects towards the bottom, that is, towards the ground, which increases the safety of the battery 100.

[0622] In some embodiments, the bottom cover 12 is detachably connected to the frame 11b to facilitate the assembly of the battery 100. For example, as... Figure 26 and Figure 27 As shown, the bottom cover 12 and the frame 11b are detachably connected by fasteners 13 such as bolts. The bottom cover 12 and the frame 11b can also be fixedly connected in other ways, and this application embodiment does not limit this.

[0623] In some embodiments, the housing 10 includes a support member 11a disposed on the top, and the battery cell 2 is connected to the support member 11a.

[0624] The support member 11a is a plate extending along the second direction y from the top of the housing 10. The support member 11a can increase the top rigidity of the battery 100 and reduce the possibility of damage to the battery 100 in a collision. Connecting the battery cell 20 to the support member 11a, that is, placing the battery cell 20 on top of the battery 100, can increase the top rigidity of the battery 100, reduce the possibility of damage to the battery 100 in a collision, and increase the safety of the battery 100.

[0625] Optionally, the battery cell 20 can be directly bonded to the carrier 11a, or it can be fixed to the carrier 11a in other ways, such as bolt connection, etc. This application embodiment does not limit this.

[0626] In some embodiments, such as Figure 24 and Figure 25 As shown, the side surface of the connecting plate 91 facing away from the receiving portion 911 and the side surface of the support member 11a facing away from the opening 10c are on the same horizontal plane. That is, the side surfaces of the connecting plate 91 and the support member 11a located on the top of the housing 11 are on the same plane, allowing the connecting plate 91 and the support member 11a to be fixed to the same surface of the external device when the battery 100 is fixed. Furthermore, having one side surface of the connecting plate 91 and the support member 11a on the same horizontal plane increases their stress resistance, giving the battery 100 better load-bearing capacity.

[0627] The connecting plate 91 protrudes vertically towards the bottom wall 102, meaning it has a certain thickness in the vertical direction. In a collision, the side of the connecting plate 91 facing away from the housing 10 may bear a certain impact force. The thickness of the connecting plate 91 enhances its rigidity and provides better protection for the connector 92.

[0628] Optionally, the connecting plate can be integrally formed with the housing 10, or the connecting plate can be positioned and connected to the housing 10 by a fixed connection method such as welding, bonding or FDS connection. This application does not make specific limitations in this regard.

[0629] In some embodiments, such as Figure 11 and Figure 18 As shown, the battery 100 includes battery cells 20 and reinforcing members 30. The top of the housing 10 is provided with a support member 11a. Multiple battery cells 20 are arranged along the second direction y, that is, the second direction y is the arrangement direction of a row of battery cells 20 in the battery 100.

[0630] The battery cell 20 includes a first wall 201 and a first outer surface m1. The first wall 201 has the largest surface area among the battery cells 20, and the first outer surface m1 is connected to the first wall 201. The reinforcing member 30 extends along the second direction y and connects to the first wall 201 of each of the multiple battery cells 20. This results in a large contact area between the reinforcing member 30 and the battery cells 20, ensuring strong connection between them. In other words, the first wall 201 of the battery cell 20 faces the reinforcing member 30, meaning it is parallel to the second direction y.

[0631] The carrier 11a is connected to the first outer surface m1 of each of the plurality of battery cells 20, wherein when the battery cell 20 is disposed in the electrical device, the battery cell 20 is located below the carrier 11a, and the carrier 11a is used to mount the battery cell 20.

[0632] The support member 11a can be the top cover of the battery 100's housing 10, or it can be part of the electrical device, such as the chassis of the vehicle 1000. When the support member 11a is the chassis of the vehicle 1000, the first outer surface m1 of the battery cell 20 is connected to the support member 11a, that is, the first outer surface m1 of the battery cell 20 is connected to the chassis surface of the vehicle 1000. Since the battery cell 20 is directly connected to the chassis surface of the vehicle, a housing cover for the battery 100 is not required, saving the space occupied by the housing cover and improving the space utilization rate of the battery 100, thereby increasing the energy density of the battery 10.

[0633] In this embodiment, a reinforcing member 30 is provided in the battery 100 and connected to a first wall 201 with the largest surface area of ​​each of the multiple battery cells 20 arranged in a row along the second direction y. The multiple battery cells 20 are connected into a whole by the reinforcing member 30. In this case, the side plate or beam structure does not need to be provided in the battery 100, which can maximize the space utilization inside the battery 100 and improve the structural strength and energy density of the battery 100. The battery 10 is also provided with a support member 11a and connected to the first outer surface m1 of each of the multiple battery cells 20 arranged along the second direction y. The first outer surface m1 is connected to the first wall 201. When the battery cell 20 is installed in the power-consuming device, the battery cell 20 is located below the support member 11a and is mounted on the support member 11a. In this way, the first outer surface m1 of the battery cell 20 is directly connected to the support member 11a, and no space needs to be left between the support member 11a and the battery cell 20, which further improves the space utilization rate inside the battery 10 and increases the energy density of the battery 100. At the same time, the battery cell 20 is mounted on the support member 11a, which can improve the structural strength of the battery 100. Therefore, the technical solution of the embodiment of this application can improve the performance of the battery 100.

[0634] At this time, the electrode terminal 214 can be arranged on the outer surface of the battery cell 20 other than the first outer surface m1, that is, the electrode terminal 214 is set on the wall of the non-supporting member 11a. In this way, there is no need to reserve space for the electrode terminal 214 between the battery cell 20 and the support member 11a, thereby maximizing the space utilization rate inside the battery 100 and increasing the energy density of the battery 100. Figure 10 , Figure 18 and Figure 46 In example (a), electrode terminals 214 are arranged on the second outer surface m2 of the battery cell 20, which is opposite to the first outer surface m1 along the vertical direction z. Figure 46 In example (b), electrode terminal 214 is arranged on the sidewall of the battery cell 20 perpendicular to the second direction y.

[0635] In some embodiments, the dimension T1 of the reinforcing member 30 in the first direction x and the dimension T2 of the battery cell 20 in the first direction x satisfy 0 < T1 / T2 ≤ 7.

[0636] When T1 / T2 is too large, the reinforcing member 30 occupies a large space, affecting the energy density. Furthermore, the reinforcing member 30 may cause excessively rapid heat conduction to the battery cell 20, potentially leading to safety issues. For example, thermal runaway in one battery cell 20 could trigger thermal runaway in other battery cells 20 connected to the same reinforcing member 30. When 0 < T1 / T2 ≤ 7, the energy density and safety performance of the battery 100 can be guaranteed.

[0637] Optionally, 0 < T1 / T2 ≤ 1 may be further satisfied to further improve the energy density of battery 100 and ensure the safety performance of battery 100.

[0638] Optionally, the weight M3 of the reinforcing member 30 and the weight M2 of the battery cell 20 satisfy 0 < M3 / M2 ≤ 20. When M3 / M2 is too large, the gravimetric energy density will be lost. When 0 < M3 / M2 ≤ 20, the gravimetric energy density of the battery 100 can be guaranteed and the safety performance of the battery 100 can be guaranteed.

[0639] Further optionally, 0.1≤M3 / M2≤1, so as to further improve the energy density of battery 100 and ensure the safety performance of battery 100.

[0640] In some embodiments, the area S3 of the surface of the reinforcing member 30 connected to the first wall 201 of the plurality of battery cells 20 and the area S4 of the first wall 201 satisfy: 0.2≤S3 / S4≤30.

[0641] S3 is the total area of ​​the surface of the side where the reinforcing member 30 connects to the battery cell 20. When S3 / S4 is too large, it affects the energy density. When S3 / S4 is too small, the thermal conductivity is too poor, affecting safety performance. When 0.2≤S3 / S4≤30, the energy density and safety performance of the battery 10 can be guaranteed.

[0642] Optionally, the energy density of battery 10 can be further improved and the safety performance of battery 10 can be guaranteed by further satisfying 2≤S3 / S4≤10.

[0643] Optionally, the specific heat capacity Q of the reinforcing member 30 and the weight M3 of the reinforcing member 30 satisfy the following condition: 0.02 kJ / (kg) 2 / ℃)≤Q / M3≤100KJ / (kg 2 / ℃). When Q / M3 < 0.02 KJ / (kg 2 When the temperature reaches 100 kJ / (kg), the reinforcing member 30 will absorb more energy, causing the temperature of the battery cell 20 to be too low, which may lead to lithium plating; Q / M3 > 100 kJ / (kg 2 At a temperature of 100°C, the reinforcing member 30 has poor thermal conductivity and cannot dissipate heat in time. The above-mentioned setting can ensure the safety performance of the battery 100.

[0644] Furthermore, 0.3 KJ / (kg 2 / ℃)≤Q / M3≤20KJ / (kg 2 / ℃), to further enhance the safety performance of battery 100.

[0645] In some embodiments, such as Figure 41As shown, the top of the housing 10 is provided with a support member 11a, and the bottom of the housing 10 is provided with a protective component 40. The support member 11a is fixedly connected to the battery cell 20, and the protective component 40 is fixedly connected to the battery cell 20 to fix the position of the battery cell 20 and enhance the stability of the battery 100 structure.

[0646] At this point, both the carrier 11a and the protective assembly 40 can be referred to as support plates.

[0647] Alternatively, the battery cell 20 can be directly bonded to the carrier 11a and the protective component 40 by adhesive, or it can be fixedly connected to the carrier 11a and the protective component 40 by other means.

[0648] For typical battery cells, the pressure relief mechanism is welded to the battery box to secure it. In the event of thermal runaway in a battery cell, the pressure relief mechanism releases internal pressure, improving the cell's safety. Taking a vent plate on the end cover of the battery box as an example, the vent plate breaks during thermal runaway, expelling contaminants and releasing internal pressure. However, because the pressure relief mechanism is welded to the battery box, cracks may appear at the weld during long-term use, reducing its strength. This can lead to the weld breaking before the internal pressure reaches the mechanism's detonation pressure, resulting in mechanism failure and low reliability.

[0649] To improve the reliability of the pressure relief mechanism, the inventors discovered that the pressure relief mechanism and the battery box of the battery cell can be integrated into a single molded structure, with a portion of the battery box serving as the pressure relief mechanism. For example, by weakening a portion of the end cap, reducing its local strength and creating a weak area, an integrated pressure relief mechanism can be formed, effectively improving its reliability.

[0650] Therefore, in some embodiments, such as Figures 48-83 As shown, the battery cell 20 also includes a battery box 21, in which the electrode assembly 22 is housed. The battery box 21 is provided with a pressure relief mechanism 213, which is integrally formed with the battery box 21 to improve the reliability of the pressure relief mechanism 213.

[0651] In some embodiments, such as Figure 48 and Figure 49As shown, the battery box 21 includes an integrally formed non-weak area 51 and a weak area 52. The battery box 21 is provided with a groove 53. The non-weak area 52 is formed around the groove 53, and the weak area 52 is formed at the bottom of the groove 53. The weak area 52 is configured to be destroyed when the internal pressure of the battery cell 20 is released. The pressure relief mechanism 213 includes the weak area 52 to further ensure the reliable use of the pressure relief structure 213.

[0652] The battery box 21 is a component that can house the electrode assembly 22 together with other components. The battery box 21 is part of the outer shell of the battery cell 20. It can be the end cap (or cover plate) of the outer shell or the shell 211 of the outer shell. The battery box 21 can be made of metal, such as copper, iron, aluminum, steel, aluminum alloy, etc., or it can be made of aluminum-plastic film.

[0653] The weak point 52 is a section of the battery box that is weaker than other areas. When the internal pressure of the battery cell 20 reaches a threshold, the weak point 52 of the battery box 21 can be damaged to release the internal pressure of the battery cell 20. The weak point 52 can be damaged by means of rupture, detachment, etc. For example, when the internal pressure of the battery cell 20 reaches the threshold, the weak point 52 can rupture under the action of the discharge (gas, electrolyte, etc.) inside the battery cell 20, allowing the discharge inside the battery cell 20 to be discharged smoothly. The weak point 52 can be of various shapes, such as rectangular, circular, elliptical, annular, arc-shaped, U-shaped, H-shaped, etc. The thickness of the weak point 52 can be uniform or non-uniform.

[0654] The weak area 52 is formed at the bottom of the groove 53. The groove 53 can be formed by stamping to achieve integral forming of the weak area 52 and the non-weak area 51. After the groove 53 is stamped on the battery box, the battery box is thinned in the area where the groove 53 is set, correspondingly forming the weak area 52. The groove 53 can be a single-level groove, with the side of the groove 53 continuous along the depth direction. For example, the groove 53 is a groove with an internal space in the shape of a cuboid or prism. The groove 53 can also be a multi-level groove, with the multi-level grooves arranged along the depth direction of the groove 53. In two adjacent grooves, the inner (deeper) first-level groove is set on the bottom surface of the outer (shallower) first-level groove. For example, the groove 53 is a stepped groove. During forming, the multi-level groove can be stamped step by step along the depth direction of the groove 53, and the weak area 52 is formed at the bottom of the deepest (innermost) first-level groove in the multi-level groove.

[0655] Non-weak region 51 is formed around groove 53. The strength of non-weak region 51 is greater than that of weak region 52, and weak region 52 is more easily damaged than non-weak region 51. When groove 53 is formed on battery box by stamping, non-weak region 51 can be an unstamped part of battery box. The thickness of non-weak region 51 can be uniform or non-uniform.

[0656] The method for measuring the average grain size can be found in the intercept method in GB6394-2017, and will not be elaborated here. When measuring the average grain size of the weak region 52, the measurement can be performed along the thickness direction of the weak region 52; when measuring the average grain size of the non-weak region 51, the measurement can be performed along the thickness direction of the non-weak region 51.

[0657] exist Figure 49 In the middle, the thickness direction of the weak region 52 is consistent with the thickness direction of the non-weak region 51, both being the z-direction.

[0658] The inventors also noted that after forming an integrated pressure relief mechanism on the battery box, the mechanical properties of the weak areas of the battery box are poor. Under normal use conditions of the battery cells, the weak areas are prone to fatigue failure due to long-term changes in the internal pressure of the battery cells, which affects the service life of the battery cells.

[0659] Therefore, in some embodiments, the average grain size of the weak region 52 is S1, and the average grain size of the non-weak region 51 is S2, satisfying: 0.05≤S1 / S2≤0.9.

[0660] In this embodiment, the weak region 52 and the non-weak region 51 are integrally formed, resulting in good reliability. Since S1 / S2 ≤ 0.9, the average grain size of the weak region 52 differs significantly from that of the non-weak region 51. Reducing the average grain size of the weak region 52 refines its grain size, improving the mechanical properties of the material, increasing its toughness and fatigue strength, reducing the risk of damage to the weak region 52 under normal operating conditions of the battery cell 20, and extending the service life of the battery cell 20.

[0661] When S1 / S2 < 0.05, the molding difficulty of the weak area 52 increases, and the strength of the weak area 52 is too great. The weak area 52 is more difficult to be destroyed when the battery cell 20 is thermally runaway, which may easily lead to untimely pressure relief.

[0662] Therefore, S1 / S2≥0.05 reduces the molding difficulty of the weak molding area 52 and improves the timeliness of pressure relief of the battery cell 20 during thermal runaway.

[0663] For example, S1 / S2 can be any one of the following point values ​​or a range of values ​​between any two: 0.01, 0.03, 0.04, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, and 0.9.

[0664] In some embodiments, 0.1≤S1 / S2≤0.5, which makes the overall performance of the battery box 21 better, ensuring that the weak area 52 can be destroyed in time when the battery cell 20 is thermally runaway, and ensuring that the weak area 52 has sufficient strength under the normal use conditions of the battery cell 20.

[0665] For example, S1 / S2 can be any one of the point values ​​of 0.1, 0.12, 0.15, 0.17, 0.2, 0.22, 0.25, 0.27, 0.3, 0.32, 0.35, 0.37, 0.4, 0.42, 0.45, 0.47, 0.5 or a range between any two.

[0666] In some embodiments, 0.4 μm ≤ S1 ≤ 75 μm.

[0667] S1 can be any one of the following values: 0.4μm, 0.5μm, 1μm, 2μm, 3μm, 4μm, 5μm, 10μm, 15μm, 20μm, 25μm, 28μm, 30μm, 35μm, 36μm, 40μm, 45μm, 49μm, 50μm, 55μm, 60μm, 65μm, 70μm, 72μm, 75μm, or a range between any two.

[0668] The inventors noted that when S1 > 75 μm, the toughness and fatigue strength of the weak area 52 are poor; when S1 < 0.4 μm, the molding of the weak area 52 is more difficult, and the strength of the weak area 52 is too high. This makes it more difficult for the weak area 52 to be damaged when the battery cell 20 experiences thermal runaway, which can easily lead to untimely pressure relief.

[0669] Therefore, 0.4μm≤S1≤75μm, on the one hand, reduces the molding difficulty of the weak area 52 and improves the timeliness of pressure relief of the battery cell 20 during thermal runaway; on the other hand, it improves the toughness and fatigue strength of the weak area 52 and reduces the risk of the weak area 52 being damaged under normal use conditions of the battery cell 20.

[0670] In some embodiments, 1μm≤S1≤10μm.

[0671] S1 can be any one of the following values: 1μm, 1.5μm, 1.6μm, 2μm, 2.5μm, 2.6μm, 3μm, 3.5μm, 3.6μm, 4μm, 4.5μm, 4.6μm, 5μm, 5.5μm, 5.6μm, 6μm, 6.5μm, 6.6μm, 7μm, 7.5μm, 7.6μm, 8μm, 8.5μm, 8.6μm, 9μm, 9.5μm, 9.6μm, 10μm, or a range between any two.

[0672] In this embodiment, 1μm≤S1≤10μm makes the overall performance of the battery box 21 better, ensuring that the weak area 52 can be destroyed in time when the battery cell 20 thermally runs away, and ensuring that the weak area 52 has sufficient strength under the normal use conditions of the battery cell 20.

[0673] In some embodiments, 10μm≤S2≤150μm.

[0674] S2 can be any point value or a range of any two of the following: 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, and 150μm.

[0675] Furthermore, 30μm≤S2≤100μm.

[0676] S2 can be any point value or a range of any two of the following values: 30μm, 32μm, 35μm, 37μm, 40μm, 42μm, 45μm, 47μm, 50μm, 52μm, 55μm, 57μm, 60μm, 62μm, 65μm, 67μm, 70μm, 72μm, 75μm, 77μm, 80μm, 82μm, 85μm, 87μm, 90μm, 92μm, 95μm, 97μm, and 100μm.

[0677] In some embodiments, the minimum thickness of the weak zone is A1, which satisfies: 1≤A1 / S1≤100.

[0678] A1 / S1 can be any one of the point values ​​or any range between two values ​​from 1, 2, 4, 5, 10, 15, 20, 21, 22, 23, 25, 30, 33, 34, 35, 37, 38, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 93, 94, 95, 100.

[0679] When A1 / S1 < 1, the fewer the number of grain layers in the thin region 52 along its thickness direction, the lower the fatigue strength of the thin region 52. When A1 / S1 > 100, the more grain layers in the thin region 52 along its thickness direction, the higher the strength of the thin region 52, which may lead to the risk that the thin region 52 cannot be destroyed in time during the thermal runaway of the battery cell 20.

[0680] Therefore, 1≤A1 / S1≤100, on the one hand, makes the number of grain layers in the thickness direction of the weak region 52 more, improves the fatigue strength of the weak region 52, and reduces the risk of the weak region 52 being damaged under normal use conditions of the battery cell 20; on the other hand, it enables the weak region 52 to be damaged more promptly when the battery cell 20 experiences thermal runaway, so as to achieve the purpose of timely pressure relief.

[0681] In some embodiments, 5 ≤ A1 / S1 ≤ 20.

[0682] A1 / S1 can be any one of the point values ​​or a range between any two of the following: 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20.

[0683] In this embodiment, 5≤A1 / S1≤20, which makes the overall performance of the battery box better. It ensures that the weak area 52 can be destroyed in time when the battery cell 20 is thermally runaway, and ensures that the weak area 52 has sufficient fatigue resistance under the normal use conditions of the battery cell 20, thereby improving the service life of the battery cell 20.

[0684] In some embodiments, the minimum thickness of the weak area is A1, and the hardness of the weak area is B1, satisfying: 5HBW / mm≤B1 / A1≤10000HBW / mm.

[0685] B1 / A1 can be any one of the following values: 5HBW / mm, 6HBW / mm, 7HBW / mm, 20HBW / mm, 50HBW / mm, 61HBW / mm, 62HBW / mm, 63HBW / mm, 64HBW / mm, 75HBW / mm, 90HBW / mm, 100HBW / mm, 120HBW / mm, 150HBW / mm, 190HBW / mm, 500HBW / mm, 1000HBW / mm, 1200HBW / mm, 1750HBW / mm, 1800HBW / mm, 2100HBW / mm, 4000HBW / mm, 5000HBW / mm, 8000HBW / mm, 9000HBW / mm, 10000HBW / mm, or a range between any two.

[0686] The hardness of the weak area 52 is Brinell hardness, measured in HBW. The measurement method for Brinell hardness can be found in GB / T23.1-2018. In actual measurement, the hardness of the weak area 52 can be measured on either the inner or outer surface in the thickness direction of the weak area 52. Taking the end cap 11 of the battery cell 20 as an example, the hardness of the weak area 52 can be measured on the outer surface facing away from the inside of the battery cell 20, or on the inner surface facing the inside of the battery cell 20.

[0687] When B1 / A1 > 10000 HBW / mm, the weak area 52 is thin and has high hardness, which makes it very brittle. Under normal operating conditions, the weak area 52 is easily damaged, resulting in a short lifespan for the battery cell 20. When B1 / A1 < 5 HBW / mm, the weak area 52 is thick and has low hardness. In the event of thermal runaway of the battery cell 20, the weak area 52 will be stretched and extended, leading to poor timely pressure relief.

[0688] In this embodiment, not only the thickness of the weak area 52 affects the performance of the battery box, but also the hardness of the weak area 52 affects the performance of the battery box. 5HBW / mm≤B1 / A1≤10000HBW / mm, which ensures that the weak area 52 has sufficient strength under normal use conditions of the battery cell 20, making it less prone to fatigue damage and improving the service life of the battery cell 20; at the same time, it also allows the battery box to release pressure in time through the weak area 52 in the event of thermal runaway of the battery cell 20, reducing the risk of the battery cell 20 exploding and improving the safety of the battery cell 20.

[0689] In some embodiments, 190HBW / mm≤B1 / A1≤4000HBW / mm.

[0690] B1 / A1 can be any one of the following values: 190HBW / mm, 250HBW / mm, 280HBW / mm, 300HBW / mm, 350HBW / mm, 400HBW / mm, 450HBW / mm, 500HBW / mm, 600HBW / mm, 700HBW / mm, 875HBW / mm, 1000HBW / mm, 1200HBW / mm, 1500HBW / mm, 1750HBW / mm, 1800HBW / mm, 2000HBW / mm, 2100HBW / mm, 2500HBW / mm, 3000HBW / mm, 3500HBW / mm, 4000HBW / mm, or a range between any two.

[0691] In this embodiment, 190HBW / mm ≤ B1 / A1 ≤ 4000HBW / mm results in better overall performance of the battery box. This ensures that the weak area 52 can be promptly destroyed in the event of thermal runaway of the battery cell 20, while also guaranteeing sufficient strength under normal operating conditions of the battery cell 20. This improves the lifespan of the battery cell 20 while ensuring its safety.

[0692] In some embodiments, 0.02mm ≤ A1 ≤ 1.6mm.

[0693] A1 can be any point value or a range between any two of the following: 0.02mm, 0.04mm, 0.05mm, 0.06mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.42mm, 1.43mm, 1.45mm, 1.47mm, 1.5mm, 1.55mm, and 1.6mm.

[0694] When A1 < 0.02 mm, the forming of the weak area 52 is difficult and it is easy to damage the weak area 52 during the forming process. When the weak area 52 > 1.6 mm, it is more difficult for the weak area 52 to be destroyed when the battery cell 20 is thermally runaway, and it is easy to cause the pressure to be released in time.

[0695] Therefore, with a diameter of 0.02mm≤A1≤1.6mm, the molding difficulty of the pressure relief area 56 of the battery box is reduced, while the timeliness of pressure relief of the battery cell 20 during thermal runaway is improved.

[0696] In some embodiments, 0.06mm ≤ A1 ≤ 0.4mm.

[0697] A1 can be any one of the following point values: 0.06mm, 0.07mm, 0.08mm, 0.1mm, 0.15mm, 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, or 0.4mm, or a range between any two.

[0698] In this embodiment, 0.06mm≤A1≤0.4mm further reduces the molding difficulty of the weak area 52 and improves the timeliness of pressure relief of the battery cell 20 during thermal runaway.

[0699] In some embodiments, the hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1 < B1 / B2 ≤ 5.

[0700] The hardness of the non-weak region 51 is Brinell hardness, measured in HBW. In actual measurement, the hardness of the non-weak region 51 can be measured on either the inner or outer surface along its thickness direction. Taking the end cap 11 of the battery cell 20 as an example, the hardness of the non-weak region 51 can be measured on the outer surface facing away from the inside of the battery cell 20, or on the inner surface facing the inside of the battery cell 20.

[0701] In this embodiment, B1 > B2, which is equivalent to increasing the hardness of the weak area 52, thereby increasing the strength of the weak area 52 and reducing the risk of the weak area 52 being damaged under normal use conditions of the battery cell 20.

[0702] B1 / B2 can be any one of the point values ​​1.1, 1.5, 2, 2.5, 3, 3.5, 3.6, 4, 4.5, 5, or any range between the two.

[0703] When B1 / B2 > 5, the hardness of the weak area 52 may be too high, which may make it difficult to destroy the weak area 52 when the battery cell 20 experiences thermal runaway.

[0704] Therefore, B1 / B2≤5 reduces the risk that the weak area 52 may not be damaged in time during the thermal runaway of the battery cell 20, thus improving the safety of the battery cell 20.

[0705] In some embodiments, B1 / B2 ≤ 2.5.

[0706] B1 / B2 can be any one of the point values ​​from 1.1, 1.11, 1.12, 1.2, 1.25, 1.3, 1.4, 1.5, 1.6, 1.7, 1.71, 1.72, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, or a range between any two.

[0707] In this embodiment, B1 / B2≤2.5, which can further reduce the risk that the weak area 52 cannot be destroyed in time when the battery cell 20 thermally runs away.

[0708] In some embodiments, 5HBW≤B2≤150HBW.

[0709] B2 can be any one of the following point values: 5HBW, 8HBW, 9HBW, 9.5HBW, 10HBW, 15HBW, 16HBW, 19HBW, 20HBW, 30HBW, 40HBW, 50HBW, 52HBW, 52.5HBW, 53HBW, 60HBW, 70HBW, 90HBW, 100HBW, 110HBW, 120HBW, 130HBW, 140HBW, and 150HBW, or a range between any two.

[0710] In some embodiments, 5HBW≤B1≤200HBW.

[0711] B1 can be any one of the following point values: 5HBW, 6HBW, 8HBW, 10HBW, 15HBW, 19HBW, 20HBW, 30HBW, 50HBW, 60HBW, 70HBW, 90HBW, 100HBW, 110HBW, 120HBW, 130HBW, 140HBW, 150HBW, 160HBW, 170HBW, 180HBW, 190HBW, and 200HBW, or a range between any two.

[0712] In some embodiments, please refer to Figure 51 and Figure 52 , Figure 52 The image shows a partial enlarged view of the battery box 21 provided for other embodiments of this application. The minimum thickness of the weak area 52 is A1, and the minimum thickness of the non-weak area 51 is A2, satisfying: 0.05≤A1 / A2≤0.95.

[0713] The minimum thickness of the weak zone 52 is the thickness at the thinnest point of the weak zone 52. The minimum thickness of the non-weak zone 51 is the thickness at the thinnest point of the non-weak zone 51.

[0714] like Figure 51 and Figure 52As shown, the battery box 21 has a first side 54 and a second side 55 arranged opposite to each other. The groove 53 is recessed from the first side 54 toward the second side 55. The part of the battery box located between the bottom surface 531 of the groove 53 and the second side 55 is a weak area 52.

[0715] The first side 54 and the second side 55 can be arranged parallel to each other or at a small angle. If the first side 54 and the second side 55 are arranged at a small angle, for example, within 10 degrees, the minimum distance between the first side 54 and the second side 55 is the minimum thickness of the non-weak area 51; Figure 51 and Figure 52 As shown, if the first side 54 and the second side 55 are parallel, the distance between the first side 54 and the second side 55 is the minimum thickness of the non-weak area 51.

[0716] The bottom surface 531 of the groove 53 can be a plane or a curved surface. If the bottom surface 531 of the groove 53 is a plane, it can be parallel to the second side surface 55 or at a small angle. If the bottom surface 531 of the groove 53 is at a small angle to the second side surface 55, for example, within 10 degrees, the minimum distance between the bottom surface 531 of the groove 53 and the second side surface 55 is the minimum thickness of the weak area 52; Figure 51 As shown, if the bottom surface 531 of the groove 53 is parallel to the second side surface 55, the distance between the bottom surface 531 of the groove 53 and the second side surface 55 is the minimum thickness of the weak area 52. Figure 52 As shown, if the bottom surface 531 of the groove is curved, for example, if the bottom surface 531 of the groove 53 is an arc surface, the minimum distance between the bottom surface 531 of the groove 53 and the second side surface 55 is the minimum thickness of the weak area 52.

[0717] A1 / A2 can be any one of the following point values ​​or a range between any two: 0.05, 0.06, 0.07, 0.08, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.8, 0.85, 0.9, and 0.95.

[0718] When A1 / A2 < 0.05, the strength of the weak area 52 may be insufficient. When A1 / A2 > 0.95, the weak area 52 may not be easily damaged during thermal runaway of the battery cell 20, leading to untimely pressure relief and potentially causing the battery cell 20 to explode. Therefore, 0.05 ≤ A1 / A2 ≤ 0.95 can reduce both the probability of the weak area 52 rupturing under normal operating conditions of the battery cell 20 and the probability of the battery cell 20 exploding during thermal runaway.

[0719] In some embodiments, 0.12 ≤ A1 / A2 ≤ 0.8.

[0720] A1 / A2 can be any one of the following point values ​​or a range between any two: 0.12, 0.13, 0.14, 0.15, 0.17, 0.2, 0.22, 0.25, 0.27, 0.3, 0.32, 0.35, 0.37, 0.4, 0.42, 0.45, 0.47, 0.5, 0.52, 0.55, 0.57, 0.6, 0.62, 0.65, 0.66, 0.67, 0.7, 0.72, 0.75, 0.77, 0.8.

[0721] In this embodiment, 0.12 ≤ A1 / A2 ≤ 0.8, resulting in better overall performance of the external components. This ensures that the weak area 52 is promptly destroyed in the event of thermal runaway of the battery cell 20, while also guaranteeing sufficient strength under normal operating conditions of the battery cell 20. When forming the groove 53 by stamping, controlling A1 / A2 between 0.12 and 0.8 makes it easier to achieve S1 / S2 ≤ 0.5, thereby refining the grain size of the weak area 52.

[0722] In some embodiments, 0.2 ≤ A1 / A2 ≤ 0.5.

[0723] A1 / A2 can be any one of the following point values ​​or a range between any two: 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5.

[0724] In this embodiment, A1 / A2 is controlled between 0.2 and 0.5. The strengthening effect of grain refinement on weak region 52 is better than the weakening effect of thickness reduction on weak region 52. This makes weak region 52 have better fatigue resistance, further reduces the risk of weak region 52 being damaged under normal use conditions of battery cell 20, and ensures that weak region 52 is destroyed in time when battery cell 20 is thermally runaway, thus improving the timeliness of pressure relief.

[0725] In some embodiments, 0.02mm ≤ A1 ≤ 1.6mm. Further, 0.06mm ≤ A1 ≤ 0.4mm.

[0726] In some embodiments, 1mm ≤ A2 ≤ 5mm. A2 can be any point value of 1mm, 2mm, 3mm, 4mm, or 5mm, or a range of values ​​between any two.

[0727] If A2 > 5mm, the thickness of the non-weak area 51 is relatively large, requiring more material and resulting in a heavier battery box, which is less economical. If A2 < 1mm, the thickness of the non-weak area 51 is relatively small, leading to poorer resistance to deformation of the battery box. Therefore, 1mm ≤ A2 ≤ 5mm results in a battery box that is both economical and has good resistance to deformation.

[0728] Furthermore, 1.2mm≤A2≤3.5mm.

[0729] A2 can be any one of the following point values: 1.2mm, 1.25mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, or a range between any two.

[0730] In this embodiment, 1.2mm ≤ A2 ≤ 3.5mm, which makes the battery box more economical and less prone to deformation. Further, 2mm ≤ A2 ≤ 3mm.

[0731] In some embodiments, please refer to Figure 53 , Figure 53 A schematic diagram of the structure of the battery box 21 provided for some embodiments of this application (showing the primary groove 532); Figure 54 for Figure 53 The EE cross-sectional view of the battery box 21 shown; Figure 55 A schematic diagram of the structure of the battery box 21 provided for some embodiments of this application (showing the primary groove 532); Figure 56 for Figure 5 The FF cross-sectional view of the battery box shown;

[0732] Figure 125 is a schematic diagram of the structure of a battery box provided in some other embodiments of this application (showing the primary groove 532); Figure 58 for Figure 53 The battery compartment 21 is shown in a GG cross-sectional view. The battery compartment 21 has a pressure relief area 56, and the groove 53 includes a primary groove 532. The groove 532 is provided along the edge of the pressure relief area 56. The pressure relief area 56 is configured to be able to open with the groove 532 as the boundary. The weak area 52 forms the bottom of the groove 532.

[0733] The pressure relief zone 56 is the area of ​​the battery box that can be opened after the weak zone 52 is damaged. For example, when the internal pressure of the battery cell 20 reaches a threshold, the weak zone 52 cracks, and the pressure relief zone 56 opens outward under the action of the discharge material inside the battery cell 20. After the pressure relief zone 56 opens, a discharge port can be formed in the battery box at the position corresponding to the pressure relief zone 56, and the discharge material inside the battery cell 20 can be discharged through the discharge port to release the pressure inside the battery cell 20.

[0734] The groove 532 can be formed into the battery box by stamping. The groove 532 in the groove portion 53 is only one level, and this level of groove 532 can be formed by one stamping. The groove 532 can be a groove of various shapes, such as annular groove, arc groove, U-shaped groove, H-shaped groove, etc. The weak area 52 is formed at the bottom of the groove 532, and the shape of the weak area 52 is the same as the shape of the groove 532. For example, the weak area 52 is a U-shaped groove, and the weak area 52 extends along the U-shaped trajectory.

[0735] In this embodiment, the weak area 52 forms the bottom of the groove 532. When the weak area 52 is damaged, the pressure relief area 56 can open with the weak area 52 as the boundary to achieve pressure relief and increase the pressure relief area of ​​the battery box.

[0736] In some embodiments, please continue to refer to Figure 54 , Figure 56 and Figure 58 As shown, the battery box 21 has a first side 54 and a second side 55 disposed opposite to each other, and a groove 532 is recessed from the first side 54 toward the direction close to the second side 55.

[0737] The first side 54 can be the inner surface of the battery box 21 facing the inside of the battery cell 20, and the second side 55 can be the outer surface of the battery box facing away from the inside of the battery cell 20; alternatively, the first side 54 can be the outer surface of the battery box facing away from the inside of the battery cell 20, and the second side 55 can be the inner surface of the battery box facing the inside of the battery cell 20. For example, the first side 54 is parallel to the second side 55, and the minimum thickness of the non-weak area 51 is the distance between the first side 54 and the second side 55.

[0738] The bottom surface of the groove 532 is the bottom surface 531 of the groove. The part of the battery box 21 between the bottom surface of the groove 532 and the second side 55 is the bottom wall of the groove 532, which is the weak area 52.

[0739] In this embodiment, the groove 53 includes only a primary groove 532, which is the groove 53 itself. The groove 53 is a primary groove, resulting in a simple structure. During molding, the groove 532 can be formed on the first side 54, simplifying the molding process, improving production efficiency, and reducing production costs.

[0740] In some embodiments, please refer to Figures 59-64 , Figure 59 A schematic diagram of the structure of the battery box 21 provided for some embodiments of this application (showing two levels of grooves 532); Figure 60 for Figure 59 The KK cross-sectional view of the battery box 21 shown; Figure 61 A schematic diagram of the structure of a battery box provided in some embodiments of this application (showing two levels of grooves 532); Figure 62 for Figure 61 The MM cross-sectional view of the battery box shown; Figure 63 A schematic diagram of the structure of a battery box provided for other embodiments of this application (showing two levels of grooves 532); Figure 64 for Figure 63 The diagram shows an NN cross-sectional view of the battery case. The battery case 21 includes a first side 54 and a second side 55 disposed opposite to each other. The groove 53 includes a multi-level groove 532, which is sequentially arranged along the direction from the first side 54 to the second side 55. A weak area 52 is formed at the bottom of the first-level groove 532 furthest from the first side 54. The battery case also has a pressure relief area 56, with the groove 532 arranged along the edge of the pressure relief area 56. The pressure relief area 56 is configured to open with the first-level groove 532 furthest from the first side 54 as its boundary.

[0741] The groove portion 53 includes multi-level grooves 532; that is, the groove portion 53 is a multi-level groove. Each level of groove 532 is provided along the edge of the pressure relief area 56, and the multi-level grooves 532 have the same shape. The grooves 532 in the groove portion 53 can be two-level, three-level, four-level, or more. Each level of groove 532 can be formed into the battery box by stamping. During forming, each level of groove 532 can be stamped sequentially along the direction from the first side 54 to the second side 55. When stamping the multi-level grooves 532, the multi-level grooves 532 can be formed by multiple stampings, with each stamping forming one level of groove 532. The grooves 532 can be grooves of various shapes, such as annular grooves, arc grooves, U-shaped grooves, H-shaped grooves, etc.

[0742] The weak area 52 is formed at the bottom of the first-level groove 532 furthest from the first side 54. This furthest first-level groove 532 is the deepest (innermost) of the first-level groove 532. In two adjacent grooves 532, the furthest first-level groove 532 is located on the bottom surface of the first-level groove 532 closest to the first side 54. The portion of the battery box between the bottom surface of the furthest first-level groove 532 furthest from the first side 54 and the second side 55 forms the bottom wall of the furthest first-level groove 532 furthest from the first side 54, which is the weak area 52. The bottom surface of the furthest first-level groove 532 furthest from the first side 54 is the bottom surface 531 of the groove portion.

[0743] During molding, multiple levels of grooves 532 can be formed on the battery box step by step, which can reduce the molding depth of each groove 532, thereby reducing the molding force on the battery box when forming each groove 532, reducing the risk of cracking in the battery box, and making the battery box less likely to fail due to cracks at the location where the grooves 532 are set, thus improving the service life of the battery box.

[0744] In some embodiments, please refer to Figure 60 , Figure 62 , Figure 64 The first-level groove 532, which is furthest from the second side 55, is recessed from the first side 54 toward the direction closer to the second side 55.

[0745] Taking the groove 532 in the groove portion 53 as an example, which has two levels, the two levels of groove 532 are the first level groove and the second level groove, respectively. The first level groove is provided on the first side surface 54, that is, the first level groove is recessed from the first side surface 54 towards the second side surface 55. The second level groove is provided on the bottom surface of the first level groove, that is, the second level groove is recessed from the bottom surface of the first level groove towards the second side surface 55. The first level groove is the outermost first-level groove 532, and the second level groove is the innermost first-level groove 532.

[0746] The groove 53 is composed of multi-level grooves 532. During molding, the multi-level grooves 532 can be gradually processed from the first side 54 to the second side 55, resulting in high molding efficiency.

[0747] In some embodiments, please refer to Figures 65-71 , Figure 65 Axonometric views of the battery box provided in some embodiments of this application; Figure 66 for Figure 65 The schematic diagram of the battery box shown (showing the primary groove 532 and the primary recessed groove 533); Figure 67 for Figure 66 The OO cross-sectional view of the battery box shown; Figure 68A schematic diagram of the battery box provided in some embodiments of this application (showing primary groove 532 and primary recess 533); Figure 69 for Figure 68 The PP cross-sectional view of the battery box shown; Figure 70 A schematic diagram of the battery box provided for other embodiments of this application (showing primary groove 532 and primary recess 533); Figure 71 for Figure 70 The battery box 21 is shown in a QQ cross-sectional view. The battery box 21 includes a first side 54 and a second side 55 arranged opposite to each other. The groove 53 also includes a primary sink 533, which is recessed from the first side 54 toward the second side 55. A pressure relief area 56 is formed on the bottom wall 5331 of the sink.

[0748] It should be noted that regardless of whether the scoring groove 532 in the groove portion 53 is single-level or multi-level, the groove portion 53 can include a single-level recessed groove 533. Understandably, the groove portion 53 contains both scoring grooves 532 and recessed grooves 533, making it a multi-level groove. The recessed groove 533 and scoring groove 532 are arranged along the direction from the first side surface 54 to the second side surface 55. During molding, the recessed groove 533 can be formed on the battery box first, and then the scoring groove 532 can be formed on the bottom wall 5331 of the recessed groove.

[0749] The bottom wall 5331 of the settling tank is the portion of the battery box located below the bottom surface of the settling tank 533. After the settling tank 533 is formed on the first side 54, the remaining portion of the battery box in the area where the settling tank 533 is located is the bottom wall 5331 of the settling tank. Figure 67 , Figure 69 , Figure 71 As shown, the portion of the battery box 21 located between the bottom surface of the sink 533 and the second side surface 55 constitutes the bottom wall 5331 of the sink. The pressure relief area 56 may be a part of the bottom wall 5331 of the sink.

[0750] The recessed groove 533, while ensuring a constant thickness of the final weak area 52, can reduce the depth of the scoring groove 532, thereby reducing the forming force on the battery box during the forming of the scoring groove 532 and reducing the risk of cracking in the battery box. Furthermore, the recessed groove 533 provides clearance for the pressure relief area 56 during opening, allowing it to open and release pressure even if the first side 54 is obstructed by an obstacle.

[0751] In some embodiments, please refer to Figures 72-77 , Figure 72 A schematic diagram of the structure of a battery box provided for some embodiments of this application (showing a primary groove 532 and a two-stage recessed groove 533); Figure 73 for Figure 72 The RR section view of the battery box shown; Figure 74A schematic diagram of the battery box provided in some embodiments of this application (showing a primary groove 532 and a two-stage recessed groove 533); Figure 75 for Figure 74 The SS cross-sectional view of the battery box shown; Figure 76 A schematic diagram of the battery box provided for other embodiments of this application (showing a primary groove 532 and a two-stage recessed groove 533); Figure 77 for Figure 76 The diagram shows a TT cross-sectional view of the battery box. The battery box includes a first side 54 and a second side 55 arranged opposite each other. The groove 53 also includes a multi-stage sink 533. The multi-stage sink 533 is arranged sequentially in the battery box 21 along the direction from the first side 54 to the second side 55. The first-stage sink 533 furthest from the second side 55 is recessed from the first side 54 toward the second side 55. The pressure relief area 56 is formed on the bottom wall 5331 of the first-stage sink furthest from the first side 54.

[0752] It should be noted that regardless of whether the scoring groove 532 in the groove portion 53 is single-level or multi-level, the groove portion 53 can include multi-level recessed grooves 533. Understandably, the groove portion 53 contains both scoring grooves 532 and recessed grooves 533, making it a multi-level groove. The recessed grooves 533 and scoring grooves 532 are arranged along the direction from the first side surface 54 to the second side surface 55. During molding, the multi-level recessed grooves 533 can be formed on the battery box first, and then the scoring grooves 532 can be formed on the bottom wall 5331 of the single-level recessed groove furthest from the first side surface 54.

[0753] The primary sinker 533 furthest from the second side 55 is the outermost primary sinker 533, and the primary sinker 533 furthest from the first side 54 is the innermost primary sinker 533. The outermost primary sinker 533 is located on the first side 54, and the outermost primary sinker 533 is recessed from the first side 54 toward the second side 55.

[0754] The bottom wall 5331 of the primary sink trough furthest from the first side 54 is the portion of the battery box located below the bottom surface of the primary sink trough 533 furthest from the first side 54. After forming multiple sink troughs 533 on the battery box, the remaining portion of the battery box in the area where the primary sink trough 533 furthest from the first side 54 is set is the bottom wall 5331 of the sink trough. Figure 73 , Figure 75 , Figure 77 As shown, the portion of the battery box located between the bo...

Claims

1. A battery, characterized in that, include: The box body has a receiving cavity inside, and the receiving cavity includes a top wall and a bottom wall that are arranged opposite each other in the vertical direction; A battery cell is disposed within the receiving cavity. The battery cell includes an electrode assembly and an electrode terminal. The electrode assembly is electrically connected to the electrode terminal. The battery cell is fixed within the receiving cavity, and the electrode terminal is disposed facing the bottom wall of the receiving cavity. A protective component is disposed between the battery cell and the bottom wall to support and carry the battery cell. The protective component includes a protective strip that abuts against the battery cell and is fixedly connected to the battery cell and / or the housing. Multiple protective strips are provided, and the multiple protective strips are spaced apart in a second direction and extend along a first direction. The first direction and the second direction are perpendicular to each other with respect to the vertical direction.

2. The battery according to claim 1, characterized in that, The battery cell has a first wall and a second wall connected together. The first wall is the wall with the largest area in the battery cell, and the second wall and the first wall are intersecting.

3. The battery according to claim 2, characterized in that, The electrode terminals are located on the first wall.

4. The battery according to claim 3, characterized in that, The battery cells are multiple and arranged in a first direction. In the first direction, each battery cell has a first surface that is opposite to the first wall. The first surface has a clearance groove. The clearance groove of one of two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell. The first direction is perpendicular to the first wall.

5. The battery according to claim 2, characterized in that, The electrode terminals are disposed on the second wall.

6. The battery according to claim 5, characterized in that, The battery cell includes two first walls and two second walls arranged opposite to each other, and the electrode terminals are configured to be at least two; At least two of the electrode terminals are disposed on the same second wall; or, each of the second walls is provided with at least one of the electrode terminals.

7. The battery according to claim 2, characterized in that, The first wall is formed in a cylindrical shape.

8. The battery according to claim 7, characterized in that, The first wall has a second wall at both axial ends, and at least one of the second walls has the electrode terminal.

9. The battery according to claim 8, characterized in that, One of the second walls has an exposed electrode terminal. The electrode assembly includes a positive electrode and a negative electrode. One of the positive electrode and the negative electrode is electrically connected to the electrode terminal, and the other of the positive electrode and the negative electrode is electrically connected to the first wall or the other second wall.

10. The battery according to claim 1, characterized in that, At least one of the battery cells is a pouch cell.

11. The battery according to claim 1, characterized in that, The battery cell also includes a pressure relief mechanism, which is located on the same wall as the electrode terminals.

12. The battery according to claim 1, characterized in that, The battery cell also includes a pressure relief mechanism, which is disposed on two walls of the battery cell, along with the electrode terminals.

13. The battery according to claim 1, characterized in that, The enclosure includes a main body and a bottom cover disposed at the bottom of the main body. The bottom cover is sealed to the main body and together they form the closed receiving cavity.

14. The battery according to claim 13, characterized in that, The wall of the bottom cover facing the battery cell forms the bottom wall of the receiving cavity.

15. The battery according to claim 13, characterized in that, The bottom cover is detachably connected to the bottom of the main body.

16. The battery according to claim 13, characterized in that, The bottom cover has a feature surface facing the receiving cavity, and the feature surface is configured as a plane.

17. The battery according to any one of claims 1-16, characterized in that, The top of the housing is provided with a support member, and the battery cell is disposed on the surface of the support member.

18. The battery according to claim 17, characterized in that, The wall of the support member facing the battery cell forms the top wall of the receiving cavity.

19. The battery according to claim 17, characterized in that, The minimum thickness H of the support member and the weight M1 of the battery satisfy the following condition: 0.0002mm / kg < H / M1 ≤ 0.2mm / kg.

20. The battery according to claim 17, characterized in that, The support member is used to define the receiving cavity, and the battery cell is suspended on the support member.

21. The battery according to claim 20, characterized in that, The battery cell is bonded to the carrier.

22. The battery according to claim 17, characterized in that, The outer surface of the battery cell facing the carrier is the first outer surface, and the electrode terminals are arranged on the outer surface of the battery cell other than the first outer surface.

23. The battery according to claim 22, characterized in that, The battery cell has a second outer surface that is opposite to the first outer surface, and the electrode terminals are arranged on the second outer surface.

24. The battery according to claim 17, characterized in that, The battery cell is a plurality of cells, and the plurality of battery cells are arranged in a second direction, which is perpendicular to the vertical direction; The support member is connected to the top wall of the plurality of battery cells, and the battery cells are located below the support member. The relationship between the vertical dimension N of the support member and the weight M2 of the battery cells satisfies: 0.04mm / kg≤N / M2≤100mm / kg.

25. The battery according to claim 24, characterized in that, The bearing component has an internal cavity.

26. The battery according to claim 25, characterized in that, The cavity is used to contain the heat exchange medium to regulate the temperature of the battery cells.

27. The battery according to claim 17, characterized in that, In the vertical direction, the surface of the support member away from the battery cell is provided with reinforcing ribs.

28. The battery according to claim 17, characterized in that, The carrier has a bearing surface facing the receiving cavity, and the bearing surface is configured as a plane.

29. The battery according to claim 28, characterized in that, The support member has a support portion and a connecting portion. The connecting portion surrounds and connects to the edge of the support portion. The support portion is used to define the receiving cavity. The connecting portion is connected to the part of the box body other than the support member. The bearing portion is configured to form the bearing surface on the inner surface facing the receiving cavity.

30. The battery according to claim 29, characterized in that, The supporting portion protrudes from the connecting portion in a direction away from the receiving cavity.

31. The battery according to claim 17, characterized in that, The box includes a bottom cover and a frame. The frame encloses a space that extends through both ends in the vertical direction. The bottom cover and the support member respectively cover the opposite ends of the enclosed space in the vertical direction. The bottom cover, the frame, and the support member together enclose the receiving cavity.

32. The battery according to any one of claims 1-16, characterized in that, The battery cell is placed upside down in the housing with its end cap facing the bottom wall. The end cap is provided with a pressure relief mechanism and the electrode terminals, both of which are positioned facing the bottom wall.

33. The battery according to any one of claims 1-16, characterized in that, The battery also includes a connecting plate and a connector. The connecting plate is provided on one side of the housing and protrudes horizontally. The connecting plate and the bottom wall form a receiving portion in the vertical direction. The connector is disposed in the receiving portion and connected to the connecting plate. The connector is electrically connected to the battery cell.

34. The battery according to claim 1, characterized in that, The battery also includes a busbar for electrically connecting to the electrode terminals of at least two of the battery cells, and a protective assembly disposed between the bottom wall and the busbar for insulating the battery cells from the bottom wall.

35. The battery according to claim 1, characterized in that, The protective strip is bonded to the battery cell and / or the casing.

36. The battery according to claim 1, characterized in that, The protective component also includes a motherboard, the protective strip is connected to the motherboard, and the motherboard is located between the protective strip and the bottom wall.

37. The battery according to claim 36, characterized in that, The motherboard abuts against the bottom wall.

38. The battery according to claim 37, characterized in that, The motherboard is fixedly connected to the bottom wall.

39. The battery according to claim 36, characterized in that, The motherboard and the protective strip are integrally formed or detachably connected.

40. The battery according to claim 1, characterized in that, The end cap of the battery cell includes a functional area and a shoulder. The functional area is provided with the electrode terminal. The shoulder is located on both sides of the functional area along a second direction. The battery cell abuts against the protective strip through the shoulder. The second direction is perpendicular to the vertical direction.

41. The battery according to claim 1, characterized in that, In the vertical direction, the thickness of the protective strip is greater than the extension height of the portion of the electrode terminal exposed in the battery cell.

42. The battery according to claim 1, characterized in that, The protective strip abuts against the electrode terminal, or the protective strip is spaced apart from the electrode terminal.

43. The battery according to claim 1, characterized in that, The orthographic projection of the electrode terminal on the bottom wall lies between the orthographic projections of the adjacent protective strip on the bottom wall.

44. The battery according to claim 1, characterized in that, The electrode terminals of two adjacent battery cells are electrically connected by a busbar. In the second direction, the extension length of one of the two adjacent protective strips is less than the extension length of the other to form a clearance notch, which is used to avoid the busbar.

45. The battery according to claim 1, characterized in that, The battery cell also includes a pressure relief mechanism, which is disposed on the same side as the electrode terminal. The orthographic projection of the pressure relief mechanism on the bottom wall is located between the orthographic projections of the adjacent protective strip on the bottom wall.

46. ​​The battery according to claim 32, characterized in that, In the vertical direction, there is a first distance H1 between the end cap and the bottom wall of the battery cell, and the first distance H1 satisfies 2mm < H1 < 30mm.

47. The battery according to claim 46, characterized in that, The ratio of the first distance H1 to the weight M2 of a single battery cell, H1 / M2, satisfies 0.2 mm / Kg < H1 / M2 < 50 mm / Kg.

48. The battery according to any one of claims 1-16, characterized in that, The battery cell also includes a battery box, the electrode assembly is housed in the battery box, and the battery box is provided with a pressure relief mechanism, which is integrally formed with the battery box.

49. The battery according to claim 48, characterized in that, The battery box includes an integrally formed non-weak area and a weak area. The battery box is provided with a groove. The non-weak area is formed around the groove, and the weak area is formed at the bottom of the groove. The weak area is configured to be destroyed when the internal pressure of the battery cell is released. The pressure relief mechanism includes the weak area.

50. The battery according to claim 49, characterized in that, The average grain size of the weak region is S1, and the average grain size of the non-weak region is S2, satisfying: 0.05≤S1 / S2≤0.

9.

51. The battery according to claim 50, characterized in that, The minimum thickness of the weak zone is A1, which satisfies: 1≤A1 / S1≤100.

52. The battery according to claim 49, characterized in that, The minimum thickness of the weak zone is A1, and the hardness of the weak zone is B1, satisfying: 5HBW / mm≤B1 / A1≤10000 HBW / mm.

53. The battery according to claim 49, characterized in that, The hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1 < B1 / B2 ≤ 5.

54. The battery according to claim 49, characterized in that, The minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05≤A1 / A2≤0.

95.

55. The battery according to any one of claims 1-16, characterized in that, The electrode assembly includes a positive electrode and a negative electrode. The positive electrode and / or the negative electrode includes a current collector and an active material layer. The current collector includes a support layer and a conductive layer. The support layer supports the conductive layer, and the conductive layer supports the active material layer.

56. The battery according to claim 55, characterized in that, Along the thickness direction of the support layer, the conductive layer is disposed on at least one side of the support layer.

57. The battery according to claim 55, characterized in that, The room temperature thin film resistance R of the conductive layer S Satisfies: 0.016Ω / □≤R S ≤420Ω / □.

58. The battery according to claim 55, characterized in that, The material of the conductive layer is selected from at least one of aluminum, copper, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

59. The battery according to claim 55, characterized in that, The material of the support layer includes one or more of polymer materials and polymer-based composite materials.

60. The battery according to claim 55, characterized in that, The thickness d1 of the support layer and the light transmittance k of the support layer satisfy the following: When 12μm≤d1≤30μm, 30%≤k≤80%; or, When 8μm≤d1<12μm, 40%≤k≤90%; or, When 1μm≤d1<8μm, 50%≤k≤98%.

61. The battery according to any one of claims 1-16, characterized in that, The electrode assembly includes a positive electrode sheet, which includes a positive current collector and a positive active material layer coated on the surface of the positive current collector. The positive active material layer includes a positive active material having a core and a shell covering the core. The core includes at least one of a ternary material, dLi₂MnO₃∙(1-d)LiMO₂, and LiMPO₄, where 0 < d < 1. M includes one or more selected from Fe, Ni, Co, and Mn. The shell contains crystalline inorganic material, the main peak of which has a full width at half maximum (FWHM) of 0-3° as measured by X-ray diffraction, and the crystalline inorganic material includes one or more selected from metal oxides and inorganic salts.

62. The battery according to claim 61, characterized in that, The shell comprises at least one of the metal oxide and the inorganic salt, and carbon.

63. The battery according to any one of claims 1-16, characterized in that, The electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive active material layer coated on the surface of the positive current collector, the positive active material layer includes a positive active material having LiMPO4, the M including Mn, and non-Mn elements, the non-Mn elements satisfying at least one of the following conditions: The ionic radius of the non-Mn element is a, the ionic radius of the manganese element is b, and |ab| / b is not greater than 10%. The valence change voltage of the non-Mn element is U, 2V. <U<5.5V; The chemical activity of the chemical bond formed by the non-Mn element and O is not less than that of the PO bond; The highest oxidation state of the non-Mn element is no greater than 6.

64. The battery according to claim 63, characterized in that, The non-Mn element includes one or both of the first doping element and the second doping element, wherein the first doping element is manganese site doping and the second doping element is phosphorus site doping.

65. The battery according to claim 64, characterized in that, The first dopant element satisfies at least one of the following conditions: The ionic radius of the first dopant element is a, the ionic radius of manganese is b, and |ab| / b is not greater than 10%. The valence change voltage of the first dopant element is U, 2V. <U<5.5V。 66. The battery according to claim 64, characterized in that, The second doped element satisfies at least one of the following conditions: The chemical activity of the chemical bond formed by the second dopant element and O is not less than that of the PO bond; The highest oxidation state of the second dopant element is no greater than 6.

67. The battery according to claim 63, characterized in that, The positive electrode active material also has a coating layer.

68. The battery according to claim 67, characterized in that, The coating layer comprises carbon.

69. The battery according to claim 68, characterized in that, The carbon in the coating layer is a mixture of SP2 and SP3 carbon.

70. The battery according to claim 69, characterized in that, The molar ratio of SP2 carbon to SP3 carbon is any value within the range of 0.1-10.

71. An electrical device, characterized in that, Includes a battery according to any one of claims 1-70, said battery being used to provide electrical energy.

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