Batteries and power consuming devices

Abstract

A battery and a power consumption device, the battery including a housing and a battery cell, an accommodating cavity provided within the housing, the accommodating cavity including a ceiling wall and a bottom wall arranged vertically opposite each other, the battery cell provided within the accommodating 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 fixed within the accommodating cavity, and arranged such that the electrode terminal faces the bottom wall of the accommodating cavity.

Description

[Technical Field]

[0001] This application relates to battery technology, and more particularly to batteries and power consuming devices.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS This application is an international patent application with application number PCT / CN2022 / 098355, filed on June 13, 2022; an international patent application with application number PCT / CN2022 / 077998, filed on February 25, 2022; an international patent application with application number PCT / CN2022 / 098380, filed on June 13, 2022; an international patent application with application number PCT / CN2022 / 098343, filed on June 13, 2022. International patent application filed on June 13, 2022, application number PCT / CN2022 / 098348; International patent application filed on June 13, 2022, application number PCT / CN2022 / 098373; International patent application filed on June 13, 2022, application number PCT / CN2022 / 098370; International patent application filed on June 13, 2022, application number P PCT / CN2022 / 077993, international patent application filed on February 25, 2022; PCT / CN2022 / 101440, international patent application filed on June 27, 2022; PCT / CN2022 / 101406, international patent application filed on June 27, 2022; PCT / CN2022 / 101414, international patent application filed on June 27, 2022; PCT / CN2022 / 101517, international patent application filed on June 27, 2022; PCT / CN2022 / 101393, international patent application filed on June 27, 2022, which are filed based on and claim priority from the above international patent applications, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] In recent years, the emergence of new energy vehicles has played a major role in promoting both social development and environmental protection. Power batteries, as rechargeable batteries, are the power source of new energy vehicles and are widely used in the field of new energy vehicles.

[0004] In some cases, the low energy density of the battery results in wasted space, which in turn affects the performance of the power consuming device. In addition, the low rigidity of the conventional battery makes it difficult to directly bear the load from other parts of the power consuming device, which can easily cause safety hazards and affect the safety of the power consuming device. Summary of the Invention

[0005] The present application aims to solve at least one technical problem existing in the related art, and therefore provides a battery that can improve the energy density and safety of the battery.

[0006] The present application further provides a power consuming device having the battery described above.

[0007] A battery according to an embodiment of the first aspect of the present application includes a housing and a battery cell, wherein an accommodating cavity is provided within the housing, the accommodating cavity includes a top wall and a bottom wall arranged opposite each other in a vertical direction, the battery cell is provided within the accommodating 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 accommodating cavity, and the electrode terminal is arranged to face the bottom wall of the accommodating cavity.

[0008] In the above technical solution, the battery cells are installed in the housing, and the electrode terminals are installed facing the bottom wall, thereby improving the safety of the battery.

[0009] In some embodiments, the battery cell has a first wall and a second wall connected to each other, the first wall being the wall with the largest area in the battery cell, and the first wall being positioned across the second wall.

[0010] In some embodiments, the electrode terminal is provided on the first wall.

[0011] In some embodiments, the battery cells are multiple and arranged in a first direction, each of the battery cells has a first surface facing the first wall in the first direction, and an escape groove is provided on the first surface, and the escape groove of one of two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

[0012] In some embodiments, the electrode terminal is located on the second wall.

[0013] In some embodiments, the battery cell includes two first walls disposed opposite each other and two second walls disposed opposite each other, and at least two of the electrode terminals are disposed, and at least two of the electrode terminals are disposed on the same second wall, or at least one of the electrode terminals is disposed on each of the second walls.

[0014] In some embodiments, the first wall is cylindrically shaped.

[0015] In some embodiments, the second walls are provided at both ends of the first wall in the axial direction, and the electrode terminal is provided on at least one of the second walls.

[0016] In some embodiments, the electrode terminal is exposed on one of the second walls, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet, one of the positive electrode sheet and the negative electrode sheet being electrically connected to the electrode terminal, and the other of the positive electrode sheet and the negative electrode sheet being electrically connected to the first wall or the other second wall.

[0017] In some embodiments, at least one of the battery cells is a soft-pack battery cell.

[0018] In some embodiments, the battery cell further includes a pressure reducing mechanism, and the pressure reducing mechanism and the electrode terminal are installed on the same wall of the battery cell.

[0019] In some embodiments, the battery cell further includes a pressure reducing mechanism, and the pressure reducing mechanism and the electrode terminal are respectively installed on two walls of the battery cell.

[0020] In some embodiments, the housing includes a main body and a bottom cover installed at the bottom of the main body, the bottom cover and the main body are hermetically connected, and together form the sealed accommodation cavity.

[0021] In some embodiments, the wall of the bottom cover facing the battery cell constitutes the bottom wall of the accommodation cavity.

[0022] In some embodiments, the bottom cover is removably connected to the bottom of the main body.

[0023] In some embodiments, the bottom cover has a feature surface facing the accommodation cavity, and the feature surface is configured as a flat surface.

[0024] In some embodiments, a placement member is provided on the upper part of the housing, and the battery cell is provided on the surface of the placement member.

[0025] In some embodiments, the wall of the placement member facing the battery cell constitutes the ceiling wall of the accommodation cavity.

[0026] In some embodiments, the minimum thickness H of the placement member and the weight M1 of the battery satisfy 0.0002 mm / kg < H / M1 ≤ 0.2 mm / kg.

[0027] In some embodiments, the placement member is used to define the accommodation cavity, and the battery cell is suspended on the placement member.

[0028] In some embodiments, the battery cell is adhered to the placement member.

[0029] In some embodiments, an outer surface of the battery cell facing the mounting member is a first outer surface, and the electrode terminal is disposed on an outer surface of the battery cell other than the first outer surface.

[0030] In some embodiments, the battery cell has a second outer surface disposed opposite the first outer surface, and the electrode terminal is disposed on the second outer surface.

[0031] In some embodiments, the battery cell is multiple, the multiple battery cells are arranged and installed in a second direction, the second direction is perpendicular to the vertical direction, the mounting member is connected to a ceiling wall of the multiple battery cells, the battery cells are located below the mounting member, and the relationship between the dimension N of the mounting member in the vertical direction and the weight M2 of the battery cells satisfies 0.04 mm / kg≦N / M2≦100 mm / kg.

[0032] In some embodiments, a cavity is located within the mounting member.

[0033] In some embodiments, the cavity is used to accommodate a heat exchange medium for regulating the temperature of the battery cell.

[0034] In some embodiments, a reinforcing rib is provided on a surface of the mounting member that is farther away from the battery cells in the vertical direction.

[0035] In some embodiments, the mounting member has a mounting surface facing the receiving cavity, and the mounting surface is configured as a flat surface.

[0036] In some embodiments, the mounting member has a mounting portion and a connecting portion, the connecting portion is connected to surround an edge of the mounting portion, the mounting portion is used to define the storage cavity, and the connecting portion is connected to a portion of the housing other than the mounting member, wherein the inner surface structure of the mounting portion facing the storage cavity forms the mounting surface.

[0037] In some embodiments, the mounting portion is disposed so as to protrude from the connecting portion in a direction away from the receiving cavity.

[0038] In some embodiments, the housing includes a bottom cover and a frame, the frame enclosing an enclosed space that is installed to penetrate both ends of the vertical direction, the bottom cover and the mounting member respectively covering opposite ends of the enclosed space in the vertical direction, and the storage cavity is formed surrounded by the bottom cover, the frame and the mounting member.

[0039] In some embodiments, the battery cells are inverted in the housing in a manner that the end covers face the bottom wall, and the pressure reducing mechanism and the electrode terminals are installed on the end covers, with the pressure reducing mechanism and the electrode terminals both facing the bottom wall.

[0040] In some embodiments, the battery further includes a connection plate and a connector, the connection plate is installed to protrude horizontally from one side of the housing, the connection plate and the bottom wall form a storage section in the vertical direction, the connector is installed in the storage section and connected to the connection plate, and the connector is electrically connected to the battery cell.

[0041] In some embodiments, the battery further includes a protection assembly, which is disposed between the battery cells and the bottom wall, thereby supporting and mounting the battery cells.

[0042] In some embodiments, the battery further includes a bus member, the bus member being used to electrically connect the electrode terminals of at least two of the battery cells, the protection assembly being installed between the bottom wall and the bus member, and the protection assembly being installed to insulate the battery cells from the bottom wall.

[0043] In some embodiments, the protective assembly includes a protective strip, the protective strip abutting the battery cell.

[0044] In some embodiments, the protective strip is fixedly connected to the battery cell and / or the housing.

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

[0046] In some embodiments, the protective strips are arranged in a plurality of positions, spaced apart in the second direction, and extend along the first direction, and the first direction, the second direction, and the vertical direction are perpendicular to each other.

[0047] In some embodiments, the protection assembly further includes a main plate, the protection strip is connected to the main plate, and the main plate is located between the protection strip and the bottom wall.

[0048] In some embodiments, the main plate abuts the bottom wall.

[0049] In some embodiments, the main plate is fixedly connected to the bottom wall.

[0050] In some embodiments, the main plate is integrally formed with or removably connected to the protective strip.

[0051] In some embodiments, the end cover of the battery cell includes a functional area and a shoulder portion, the electrode terminal is installed in the functional area, the shoulder portions are located on both sides of the functional area along a second direction, the battery cell abuts the protective strip via the shoulder portions, and the second direction is perpendicular to the vertical direction.

[0052] In some embodiments, the thickness of the protective strip in the vertical direction is greater than the extension height of the portion of the electrode terminal exposed from the battery cell.

[0053] In some embodiments, the protective strip abuts the electrode terminal, or the protective strip and the electrode terminal are spaced apart.

[0054] In some embodiments, the orthogonal projections of the electrode terminals on the bottom wall are located between orthogonal projections of adjacent protective strips on the bottom wall.

[0055] In some embodiments, the electrode terminals of two adjacent battery cells are electrically connected via a bus member, and the extension length of one of the two adjacent protective strips in the first direction is shorter than the extension length of the other, thereby forming a relief notch, which is used to allow the bus member to escape.

[0056] In some embodiments, the battery cell further includes a pressure reducing mechanism, the pressure reducing mechanism is installed on the same side as the electrode terminal, and an orthogonal projection of the pressure reducing mechanism on the bottom wall is located between orthogonal projections of the adjacent protective strips on the bottom wall.

[0057] In some embodiments, the end cover and the bottom wall of the battery cell have a first distance H1 in the vertical direction, and the first distance H1 is 2 mm.

[0058] In some embodiments, the ratio H1 / M2 of the first distance H1 to the weight M2 of a single battery cell is 0.2 mm / Kg

[0059] In some embodiments, the battery cell further includes a battery case, the electrode assembly is accommodated in the battery case, and a pressure reducing mechanism is installed in the battery case, and the pressure reducing mechanism is integrally formed with the battery case.

[0060] ​​In some embodiments, the battery case includes an integrally formed non-fragile region and a fragile region, a groove is provided in the battery case, the non-fragile region is formed around the groove, the fragile region is formed at the bottom of the groove, the fragile region is arranged to be broken when the battery cell releases internal pressure, and the pressure reducing mechanism includes the fragile region.

[0061] In some embodiments, when the average crystal grain size of the fragile region is S1 and the average crystal grain size of the non-fragile region is S2, 0.05 ≦ S1 / S2 ≦ 0.9 is satisfied.

[0062] In some embodiments, when the minimum thickness of the fragile region is A1, 1 ≦ A1 / S1 ≦ 100 is satisfied.

[0063] In some embodiments, when the minimum thickness of the fragile region is A1 and the hardness of the fragile region is B1, 5 HBW / mm ≦ B1 / A1 ≦ 10000 HBW / mm is satisfied.

[0064] In some embodiments, when the hardness of the fragile region is B1 and the hardness of the non-fragile region is B2, 1 < B1 / B2 ≦ 5 is satisfied.

[0065] In some embodiments, when the minimum thickness of the fragile region is A1 and the minimum thickness of the non-fragile region is A2, 0.05 ≦ A1 / A2 ≦ 0.95 is satisfied.

[0066] In some embodiments, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer, the current collector includes a support layer and a conductive layer, the support layer is used to support the conductive layer, and the conductive layer is used to support the active material layer.

[0067] In some embodiments, along the thickness direction of the support layer, the conductive layer is installed on at least one side of the support layer.

[0068] In some embodiments, the surface resistance R of the conductive layer at room temperature

[0074] , satisfies 0.016 Ω / □ ≤ R S ≤ 420 Ω / □.

[0069] 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.

[0070] In some embodiments, the material of the support layer includes one or more of polymer materials and polymer - based composite materials.

[0071] In some embodiments, the thickness d1 of the support layer and the light transmittance k of the support layer satisfy the following. When 12 μm ≤ d1 ≤ 30 μm, 30% ≤ k ≤ 80%; or when 8 μm ≤ d1 < 12 μm, 40% ≤ k ≤ 90%; or when 1 μm ≤ d1 < 8 μm, 50% ≤ k ≤ 98%.

[0072] 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 covering the core, the core includes at least one of a ternary system 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 includes a crystalline inorganic substance, the crystalline inorganic substance has a half - value width of the main peak measured by X - ray diffraction of 0 to 3°, and the crystalline inorganic substance includes one or more of metal oxides and inorganic salts.

[0073] In some embodiments, the shell includes at least one of the metal oxide and the inorganic salt and carbon.

[0074] 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 non-Mn elements, and the non-Mn elements satisfy at least one of the following conditions. When the ionic radius of the non-Mn element is a and the ionic radius of the manganese element is b, |a - b| / b is 10% or less. When the valence change voltage of the non-Mn element (the voltage of the battery cell when the valence of the element changes during charge and discharge of the battery cell) 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 6 or less.

[0075] 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 dopant, and the second doping element is a phosphorus site dopant.

[0076] In some embodiments, the first doping element satisfies at least one of the following conditions. When the ionic radius of the first doping element is a and the ionic radius of the manganese element is b, |a - b| / b is 10% or less. When the valence change voltage of the first doping element is U, 2V < U < 5.5V.

[0077] 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 6 or less.

[0078] In some embodiments, the positive electrode active material further has a coating layer.

[0079] In some embodiments, the coating layer contains carbon.

[0080] In some embodiments, the carbon in the coating layer is a mixture of SP2 and SP3 forms of carbon.

[0081] In some embodiments, the molar ratio of carbon in the SP2 form to carbon in the SP3 form is any value within the range of 0.1-10.

[0082] A power consumption device according to an embodiment of the second aspect of the present application includes a battery according to an embodiment of the first aspect of the present application for supplying electrical energy.

[0083] Other aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0084] The above and / or other aspects and advantages of the present application will become apparent and readily understood from the following detailed description of the embodiments taken in conjunction with the drawings.

[0085] [Figure 1] 1 is a schematic diagram of a power consuming device according to an embodiment of the present application; [Figure 2] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 3] FIG. 2 is an exploded view of a battery according to another embodiment of the present application. [Figure 4] FIG. 2 is an exploded view of a battery cell according to an embodiment of the present application. [Figure 5] FIG. 5 is a schematic diagram of the battery cell shown in FIG. [Figure 6] FIG. 10 is a schematic diagram of an arrangement of battery cells according to another embodiment of the present application. [Figure 7] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 8] FIG. 8 is a schematic diagram illustrating the arrangement of the battery cells shown in FIG. [Figure 9] 1 is a schematic diagram of a battery cell according to an embodiment of the present application. [Figure 10] 1 is a structural schematic diagram of a battery according to some embodiments of the present application. [Figure 11] FIG. 11 is an exploded view of the battery shown in FIG. [Figure 12] 1 is a structural schematic diagram of a bottom cover according to some embodiments of the present application; [Figure 13] FIG. 13 is a plan view of the bottom cover shown in FIG. [Figure 14] FIG. 13 is a front view of the bottom cover shown in FIG. [Figure 15] FIG. 10 is a structural schematic diagram of a bottom cover according to another embodiment of the present application. [Figure 16] FIG. 11 is an exploded view of the battery shown in FIG. [Figure 17] 15 is a schematic vertical orthographic projection view of the bottom cover shown in FIG. 14. FIG. [Figure 18] 1 is a schematic diagram of the external appearance of a battery cell according to some embodiments of the present application. FIG. [Figure 19] FIG. 19 is a front view of the battery cell shown in FIG. 18. [Figure 20] 1 is a structural schematic diagram of a mounting member according to some embodiments of the present application. [Figure 21] FIG. 10 is a structural schematic diagram of a mounting member according to another embodiment of the present application. [Figure 22] 22 is a vertical orthographic projection view of the mounting member shown in FIG. 21. FIG. [Figure 23] FIG. 11 is a front view of the battery shown in FIG. [Figure 24] 1 is a schematic diagram of a battery applied to a body in some embodiments of the present application. [Figure 25] FIG. 25 is a schematic diagram of the battery shown in FIG. 24. [Figure 26] FIG. 25 is a first exploded view of the structure shown in FIG. 24. [Figure 27] FIG. 25 is a second exploded view of the structure shown in FIG. 24. [Figure 28] 1 is a schematic diagram of the attachment relationship between a battery and a body in some embodiments of the present application. [Figure 29] 1 is a schematic diagram of a battery according to some embodiments of the present application. [Figure 30] 1 is a structural schematic diagram of a mounting member according to some embodiments of the present application; [Figure 31] 1 is a structural schematic diagram of a mounting member according to some embodiments of the present application; [Figure 32] 1 is a structural schematic diagram of a mounting member according to some embodiments of the present application; [Figure 33] 1 is a structural schematic diagram of a mounting member according to some embodiments of the present application; [Figure 34] 1 is a structural schematic diagram of a mounting member according to some embodiments of the present application; [Figure 35] 1 is a structural schematic diagram of a battery according to some embodiments of the present application. [Figure 36] 1 is a structural schematic diagram of a battery according to an embodiment of the present application; [Figure 37] FIG. 37 is a schematic diagram of the battery module shown in FIG. 36. [Figure 38] FIG. 1 is a schematic diagram of a battery cell and a thermally conductive member fitted together according to some embodiments of the present application. [Figure 39] FIG. 1 is a schematic diagram of a battery cell and a thermally conductive member fitted together according to some embodiments of the present application. [Figure 40] FIG. 1 is a schematic diagram of a battery cell and a thermally conductive member fitted together according to some embodiments of the present application. [Figure 41] FIG. 1 is an exploded view of a battery according to some embodiments of the present application. [Figure 42] FIG. 42 is a structural schematic diagram of a protection assembly for the battery shown in FIG. 41. [Figure 43] FIG. 42 is a cross-sectional schematic view of the battery shown in FIG. 41. [Figure 44] FIG. 44 is an enlarged schematic view of the circled area B in FIG. 43. [Figure 45] 1 is a structural schematic diagram of a crash test device A for performing a crash test on batteries according to some embodiments of the present application. [Figure 46] 1 is a schematic diagram illustrating the arrangement of electrode terminals according to some embodiments of the present application. [Figure 47] FIG. 1 is a schematic diagram of a battery cell and a thermally conductive member fitted together according to some embodiments of the present application. [Figure 48] 1 is a structural schematic diagram of an outer case according to some embodiments of the present application. [Figure 49]49 is a cross-sectional view taken along CC of the outer case shown in FIG. 48. [Figure 50] FIG. 50 is a diagram (schematic diagram) of the crystal grain size of the outer case shown in FIG. 49. [Figure 51] FIG. 50 is a partial enlarged view of a portion E of the outer case shown in FIG. 49. [Figure 52] FIG. 10 is a partially enlarged view of an outer case according to another embodiment of the present application. [Figure 53] 1 is a structural schematic diagram of an outer case according to some embodiments of the present application (showing a single-stage shallow groove); [Figure 54] 54 is a cross-sectional view of the outer case shown in FIG. 53 . [Figure 55] FIG. 10 is a schematic view of the structure of an outer case according to another embodiment of the present application (showing a single-stage shallow groove). [Figure 56] 56 is a cross-sectional view of the outer case shown in FIG. 55, taken along line FF. [Figure 57] FIG. 10 is a schematic view of the structure of an outer case according to another embodiment of the present application (showing a single-stage shallow groove). [Figure 58] FIG. 58 is a cross-sectional view of the outer case shown in FIG. 57 . [Figure 59] FIG. 10 is a schematic structural view of an outer case according to another embodiment of the present application (showing a second shallow groove). [Figure 60] FIG. 60 is a KK cross-sectional view of the outer case shown in FIG. 59. [Figure 61] FIG. 10 is a schematic structural view of an outer case according to another embodiment of the present application (showing a second shallow groove). [Figure 62] 62 is an MM cross-sectional view of the outer case shown in FIG. 61. [Figure 63] FIG. 10 is a schematic structural view of an outer case according to another embodiment of the present application (showing a second shallow groove). [Figure 64] 64 is a cross-sectional view of the outer case shown in FIG. 63, taken along line N-N. [Figure 65] FIG. 1 is an axonometric view of an outer casing according to some embodiments of the present application. [Figure 66] FIG. 66 is a structural schematic diagram of the outer case shown in FIG. 65 (showing a one-stage shallow groove and a one-stage counterbore groove). [Figure 67] FIG. 67 is a cross-sectional view of the outer case shown in FIG. 66 . [Figure 68] 10 is a structural schematic diagram of an outer case according to another embodiment of the present application (showing a one-stage shallow groove and a one-stage counterbore groove). FIG. [Figure 69] FIG. 69 is a cross-sectional view of the outer case shown in FIG. 68 taken along line PP. [Figure 70] 10 is a structural schematic diagram of an outer case according to another embodiment of the present application (showing a one-stage shallow groove and a one-stage counterbore groove). FIG. [Figure 71] FIG. 71 is a cross-sectional view of the outer case shown in FIG. 70 . [Figure 72] 3A and 3B are structural schematic diagrams of outer cases according to some embodiments of the present application (showing a one-stage shallow groove and a two-stage counterbore groove). [Figure 73] 73 is a cross-sectional view of the outer case taken along the line RR in FIG. 72. [Figure 74] 10 is a structural schematic diagram of an outer case according to another embodiment of the present application (showing a one-stage shallow groove and a two-stage countersunk groove). FIG. [Figure 75] 75 is a cross-sectional view of the outer case shown in FIG. 74. FIG. [Figure 76] 3A and 3B are structural schematic diagrams of outer case members according to some embodiments of the present application (showing a one-stage shallow groove and a two-stage countersunk groove); [Figure 77] FIG. 77 is a cross-sectional view of the outer case shown in FIG. 76 . [Figure 78] FIG. 10 is a structural schematic diagram of an outer case according to another embodiment of the present application. [Figure 79] 10 is a diagram (schematic diagram) showing the grain size of an outer case according to another embodiment of the present invention. [Figure 80] 1 is a structural schematic diagram of an end cover according to some embodiments of the present application. [Figure 81] 1 is a structural schematic diagram of a housing according to some embodiments of the present application. [Figure 82] FIG. 10 is a structural schematic diagram of a housing according to another embodiment of the present application. [Figure 83] 1 is a structural schematic diagram of a battery cell according to some embodiments of the present application; [Figure 84] FIG. 2 is a structural schematic diagram of a positive electrode current collector according to a specific embodiment of the present application. [Figure 85]FIG. 2 is a structural schematic diagram of a positive electrode current collector according to another specific embodiment of the present application. [Figure 86] FIG. 2 is a structural schematic diagram of a negative electrode current collector according to a specific embodiment of the present application. [Figure 87] FIG. 2 is a structural schematic diagram of a negative electrode current collector according to another specific embodiment of the present application. [Figure 88] FIG. 2 is a structural schematic diagram of a positive electrode sheet according to a specific embodiment of the present application. [Figure 89] FIG. 2 is a structural schematic diagram of a positive electrode sheet according to another specific embodiment of the present application. [Figure 90] FIG. 2 is a structural schematic diagram of a negative electrode sheet according to a specific embodiment of the present application. [Figure 91] FIG. 2 is a structural schematic diagram of a negative electrode sheet according to another specific embodiment of the present application. [Figure 92] FIG. 1 is a schematic diagram of a single nailing test of the present application. [Figure 93] This is the temperature change curve of lithium ion battery 1# and lithium ion battery 4# after one nail driving test. [Figure 94] This is the voltage change curve of lithium ion battery 1# and lithium ion battery 4# after one nail driving test. [Figure 95] 1 shows X-ray diffraction (XRD) spectra of undoped LiMnPO4 and the positive electrode active material prepared in Example 2. [Figure 96] 1 is an energy dispersive X-ray spectroscopy (EDS) spectrum of the positive electrode active material produced in Example 2. [Figure 97] 1 is a schematic diagram of the cathode active material having the core-shell structure of the present application. FIG. [Figure 98] FIG. 1 is a schematic diagram of a cathode active material having a core-shell structure according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0086] The embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following examples and the drawings are used to exemplify the principles of the present application, but are not intended to limit the scope of the present application, and the present application is not limited to the described examples.

[0087] In this description, unless otherwise defined, all technical and scientific terms used have the same meaning as commonly understood by those skilled in the art. The terms used are merely for the purpose of describing specific embodiments and are not intended to limit the present application. In the specification and claims of this application and the description of the drawings, the terms "comprises," "has," and their equivalents are intended to be non-exclusive. The term "plurality" means two or more. The orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for ease of explanation and simplification. They do not indicate or imply that the subject devices or elements have a particular orientation, or that they should be configured or operated in a particular orientation, and therefore should not be construed as limiting the present application. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "vertical" does not mean vertical in the strict sense, but rather has a margin of error. "Parallel" does not mean parallel in the strict sense, but is within an allowable error range.

[0088] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Appearances of the term "embodiment" in various places in this specification do not necessarily refer to the same embodiment, nor do they refer to embodiments that are mutually exclusive, independent, or alternative to other embodiments. Those skilled in the art should understand, both explicitly and implicitly, that embodiments described herein can be combined with other embodiments.

[0089] Any directional expressions appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present application. It should be further explained that, unless otherwise clearly specified and limited, the terms "attached," "connected," and "connection" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

[0090] The term "and / or" in this application merely describes the relationship between related objects and indicates that three types of relationships can exist. For example, A and / or B can indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. In this application, the term "or" is inclusive unless otherwise specified. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied when A is true (or exists) and B is false (or does not exist), or when A is false (or does not exist) and B is true (or exists), or when both A and B are true (or exist).

[0091] The terms "comprise" and "comprises" used herein refer to both open and closed forms unless otherwise specified. For example, the terms "comprise" and "comprises" can indicate that other elements not listed may also be included or may include, or that only the listed elements may be included or may include.

[0092] The "ranges" disclosed herein are defined in terms of lower and upper limits, and a given range is defined by selecting one lower limit and one upper limit, with the selected lower and upper limits defining the boundaries of the particular range. Ranges defined in this manner may be inclusive or exclusive of the endpoints and may be arbitrarily combined, i.e., any lower limit may be combined with any upper limit to form a range. Any lower limit may be combined with any upper limit to form an explicitly stated range, and any lower limit may be combined with another lower limit to form an explicitly stated range. Similarly, any upper limit may be combined with any other upper limit to form an explicitly stated range. Furthermore, even if not explicitly stated, each point or individual value between the endpoints of a range is included within that range. Thus, each point or individual value can be used as its own lower or upper limit, or can be combined with any other point or individual value, or with other lower or upper limits, to form an explicitly stated range.

[0093] For example, if ranges of 60 to 120 and 80 to 110 are recited for a particular parameter, it is understood that the ranges of 60 to 110 and 80 to 120 are also contemplated. Also, if minimum range values ​​of 1 and 2 are recited and maximum range values ​​of 3, 4, and 5 are recited, the ranges of 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5 are all contemplated. Unless otherwise specified, the numerical range "a to b" herein is a shorthand notation for any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0 to 5" means that all real numbers between "0 and 5" are recited herein, and "0 to 5" is merely a shorthand notation for these combinations of numbers. Furthermore, when a parameter is described as an integer ≧2, this is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. In this application, the term "about" a certain value indicates a range, that is, a range of ±10% of the value.

[0094] All embodiments and optional embodiments herein can be combined with each other to form new technical solutions unless otherwise specified. All technical features and optional technical features herein can be combined with each other to form new technical solutions unless otherwise specified. All steps herein can be performed sequentially or randomly, preferably sequentially, unless otherwise specified. For example, when a method includes steps (a) and (b), this means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, when a method may further include step (c), this means that step (c) may be added to the method in any order, e.g., the method may include steps (a), (b), and (c), or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.

[0095] In this specification, the terms "coating layer" and "coating" refer to a layer of material coated on a core material, such as lithium manganese phosphate, and the layer of material can completely or partially cover the core. The term "coating layer" is used for ease of explanation and is not intended to limit the scope of the present application. Each coating layer may completely or partially cover the core. Similarly, the term "thickness of the coating layer" refers to the thickness of the layer of material coated on the core in the radial direction of the core.

[0096] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0097] The battery referred to in the embodiments of this application refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery pack. The battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0098] The housing 10 may include a first portion 101 and a second portion 102 (shown in FIGS. 2 and 3 ). When the first portion 101 and the second portion 102 are fitted together, the first portion 101 and the second portion 102 together define an accommodating cavity 10a for accommodating the battery cell 20. The second portion 102 may have a hollow structure with one end open, and the first portion 101 may have a plate-like structure. The first portion 101 may be fitted over the open side of the second portion 102, thereby forming a housing having the accommodating cavity 10a. The first portion 101 and the second portion 102 may both have a hollow structure with one end open, and the open side of the first portion 101 may be fitted over the open side of the second portion 102, thereby forming a housing having the accommodating cavity 10a. Of course, the housing 10 may have various shapes, such as a cylindrical body or a rectangular parallelepiped.

[0099] In order to improve the sealing performance after the first part 101 and the second part 102 are connected, a sealing member such as a sealant or a seal ring may be installed between the first part 101 and the second part 102.

[0100] The material of the housing 10 may be an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material made of glass fiber and epoxy resin.

[0101] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell operates primarily through the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer coated thereon, and the current collector without the positive electrode active material layer is called a positive electrode tab. For example, in a lithium-ion battery, the positive electrode current collector may be made of aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector, the portion of the current collector not coated with the negative electrode active material layer protruding from the current collector coated with the negative electrode active material layer, and the portion of the current collector not coated with the negative electrode active material layer being the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. To ensure that melting does not occur due to a large current, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0102] The type of the separator is not particularly limited, and any known porous separator having electrical and chemical stability can be selected, for example, glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, which may be a single-layer or multi-layer film of one or more of polypropylene (PP) or polyethylene (PE). The electrode assembly may have a wound structure or a laminated structure, and the present application is not limited thereto.

[0103] The electrolyte solution includes an organic solvent and an electrolyte salt, the electrolyte salt transporting ions between the positive and negative electrodes, and the organic solvent acting as a medium for transporting ions. The electrolyte salt may be any electrolyte salt known in the art for use in battery cell electrolytes, such as LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoroarsenate), LiFSI (lithium bisfluorosulfonylimide), LiTFSI (lithium bistrifluoromethanesulfonylimide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorophosphate), LiBOB (lithium difluorooxalatoborate), LiPO2F2 (lithium bisoxalatoborate), LiDFOP (lithium difluorooxalatophosphate), and LiTFOP (lithium tetrafluorooxalatophosphate). The organic solvent may be any organic solvent known in the art for use in battery cell electrolytes, such as ethylene carbonate. The electrolyte salt and organic solvent may be one or more, preferably two or more, of the following: ethylenediaminetetraacetic acid (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene 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), methylsulfonylmethane (MSM), ethyl methanesulfonate (EMS), and diethylsulfone (ESE). Appropriate electrolyte salts and organic solvents may be selected according to actual requirements.

[0104] Of course, the battery cell may not contain electrolyte.

[0105] To meet different power demands, a battery can include multiple battery cells, and the multiple battery cells can be connected in series, parallel, or series-parallel, with series-parallel connection referring to a mixture of series and parallel connections. Alternatively, multiple battery cells can first be connected in series, parallel, or series-parallel to form a battery module, and multiple battery modules can then be connected in series, parallel, or series-parallel to form a battery. That is, multiple battery cells can directly form a battery, or can first form a battery module or battery group, and then the battery module or battery group can form a battery. The battery can also be installed in a power consumption device to supply electrical energy to the power consumption device.

[0106] At present, with the development of the market situation, the application of power batteries is becoming more and more widespread. Power batteries are not only used in energy storage power systems such as hydroelectric power, thermal power, wind power and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in military equipment and aerospace, etc. With the continuous expansion of the application fields of power batteries, the demand for them in the market is also constantly increasing.

[0107] In the related art, the opening of the battery housing is normally vertically upward, the battery cells are fixed to the bottom of the battery housing, and the electrode terminals face a cover that covers the opening of the housing.

[0108] However, the inventors noticed that in a battery installed as described above, when the battery is installed in a power consumption device, the battery cells are fixed to the bottom of the battery casing, so the rigidity of the upper part of the battery casing, which is more susceptible to collision, is low, and in the process of the battery colliding, the force received by the internal battery cells is not uniform, making the battery more susceptible to damage, reducing the safety of the battery and affecting the battery's usability.

[0109] In view of this, the embodiments of the present application provide a technical solution, in which battery cells are installed in a housing cavity in a battery, the battery cells are fixed in the housing cavity, and the electrode terminals of the battery cells are installed facing the bottom wall of the housing cavity, thereby effectively improving the safety of the battery.

[0110] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, mobile devices, laptops, electric cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc., and spacecraft include aircraft, rockets, space shuttles and spaceships, etc.

[0111] It should be noted that the technical solutions described in the embodiments of the present application are not only applicable to the above-mentioned devices, but also to all devices that use batteries. However, for the sake of simplicity, the following embodiments will be described using electric vehicles as examples.

[0112] For example, FIG. 1 shows a structural schematic diagram of a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, etc. A motor 101, a controller 102, and a battery 100 may be installed inside the vehicle 1000. The controller 102 is used to control the battery 100 and supply power to the motor 101. For example, the battery 100 may be installed at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, for example, to meet the operating power needs for starting, navigation, and driving the vehicle 1000. In another embodiment of the present application, the battery 100 can provide driving power to the vehicle 1000 not only as an operating power source for the vehicle 1000 but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas.

[0113] To meet various power usage demands, the battery 100 may include one or more battery cells 20. For example, Figures 2 and 3 show structural schematic diagrams of a battery 100 according to an embodiment of the present application, in which the battery 100 may include multiple battery cells 20. The battery 100 may further include a housing 10, the interior of which has a hollow structure, and the multiple battery cells 20 are housed within the housing 10. For example, the multiple battery cells 20 may be combined in parallel, series, or series-parallel connection with each other and then placed within the housing 10.

[0114] Optionally, the battery 100 may further include other structures, the description of which will be omitted here. For example, the battery 100 may further include a bus member, which is used to realize electrical connections between the multiple battery cells 20, such as parallel connections, series connections, or series-parallel connections. Specifically, the bus member can realize electrical connections between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. Electrical energy from the multiple battery cells 20 may further be extracted through the housing via a conductive mechanism. Optionally, the conductive mechanism may belong to the bus member.

[0115] The number of battery cells 20 can be set to any number according to different power demands, for example, there can be only one battery cell 20. Multiple battery cells 20 can be connected in series, parallel, or series-parallel connection to achieve greater capacity or output. Because each battery 100 includes a large number of battery cells 20, the battery cells 20 can be installed in groups for ease of installation, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in a battery module is not limited and can be set as needed. A battery can include multiple battery modules, and these battery modules can be connected in series, parallel, or series.

[0116] FIG. 4 shows a structural schematic diagram of a battery cell 20 according to one embodiment of the present disclosure. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and an end cover 212. The housing 211 and the end cover 212 form an outer case or battery case 212 of the battery cell 20. The walls of the housing 211 and the end cover 212 are both referred to as the walls of the battery cell 20. In a rectangular parallelepiped battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 is determined according to the shape of the battery cell 20 after assembling one or more electrode assemblies 22. For example, the housing 211 may be a hollow rectangular parallelepiped, cube, or cylinder, and one side of the housing 211 may have an opening so that one or more electrode assemblies 22 can be disposed within the housing 211. For example, if the housing 211 is a hollow rectangular parallelepiped or cube, one plane of the housing 211 is an open plane, which has no wall and allows communication between the inside and outside of the housing 211. The housing 211 may be a hollow cylinder, in which case the end surface of the housing 211 is an open surface, i.e., the end surface has no wall and communicates with the inside and outside of the housing 211. The end cover 212 covers the opening 10 and is connected to the housing 211 to form a sealed cavity in which the electrode assembly 22 is disposed. The housing 211 is filled with an electrolyte, such as an electrolyte solution, and may be made of any of a variety of materials, including copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not particularly limited thereto.

[0117] The battery cell 20 may further include two electrode terminals 214 mounted on the end cover 212. The end cover 212 is generally flat, and the two electrode terminals 214 are fixed to the flat surface of the end cover 212, and are a positive terminal 214a and a negative terminal 214b, respectively. A connecting member 23 (also referred to as a current collecting member) is mounted corresponding to each electrode terminal 214, and the connecting member 23 is located between the end cover 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminals 214.

[0118] As shown in FIG. 4 , each electrode assembly 22 has a first tab 221a and a second tab 222a. The polarities of the first tab 221a and the second tab 222a are opposite. For example, if the first tab 221a is a positive electrode tab, the second tab 222a is a negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via one 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 electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via another connecting member 23.

[0119] In the battery cell 20, one or more electrode assemblies 22 can be installed according to the requirements of actual use, and FIG. 4 shows that four independent electrode assemblies 22 are installed in the battery cell 20.

[0120] The battery cell 20 may further be provided with a pressure reduction mechanism 213. The pressure reduction mechanism 213 is used to activate and release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold. Specifically, the pressure reduction mechanism 213 is an element or component that activates and releases the internal pressure when the internal pressure of the battery cell 20 reaches a predetermined threshold. When the internal pressure of the battery cell 20 reaches the predetermined threshold, the pressure reduction mechanism 213 generates an operation or is triggered to a certain state, thereby releasing the internal pressure of the battery cell 20. The operation generated by the pressure reduction mechanism 213 includes, but is not limited to, rupturing, crushing, tearing, or opening of at least a portion of the pressure reduction mechanism 213, thereby forming an opening or passage through which the internal pressure can be released. At this time, the high-temperature and high-pressure material inside the battery cell 20 is discharged from the activated location as a discharge. In this manner, pressure can be released from the battery cell 20 under controllable pressure conditions, preventing the occurrence of potentially more serious accidents. The pressure reducing mechanism 213 may be, for example, an explosion-proof valve, an air valve, a pressure reducing valve, or a safety valve, and specifically may be a pressure-sensitive element or structure.

[0121] For example, the pressure reduction mechanism 213 may be a temperature-sensitive pressure reduction mechanism configured to melt when the internal temperature of the battery cell 20 in which the pressure reduction mechanism 213 is installed reaches a threshold value, and / or the pressure reduction mechanism 213 may be a pressure-sensitive pressure reduction mechanism configured to burst when the internal air pressure of the battery cell 20 in which the pressure reduction mechanism 213 is installed reaches a threshold value.

[0122] 10 and 11 show a schematic diagram of the structure of a battery 100 according to one embodiment of the present invention.

[0123] The battery 100 includes a housing 10 and a battery cell 20. An accommodating cavity 10a is provided in the housing 10. The accommodating 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 vertically from top to bottom. The battery cell 20 is provided in the accommodating cavity 10a. The battery cell 20 includes an electrode terminal 22 and an electrode terminal 214. The electrode terminal 22 is electrically connected to the electrode terminal 214, so that the battery cell 20 is used to supply electrical energy.

[0124] The battery cell 20 is fixed in the receiving cavity 10a, and the electrode terminals 214 are disposed facing the bottom wall 102 of the receiving cavity 10a, thereby providing a large space for electrical connection to the electrode terminals 214. This improves the energy density of the battery 100 and improves the usability and safety of the battery 100.

[0125] For example, by fixing the battery cells 20 to the upper part inside the housing 10, the rigidity of the upper part of the battery 100 is increased, further improving the safety of the battery 100.

[0126] For ease of explanation, the vertical direction is defined as the up-down direction. However, when using the battery 100, the vertical direction may be other directions, and is not particularly limited here.

[0127] 5, the battery cell 20 includes a first wall 201 and a second wall 202 connected to each other, where the first wall 201 is the wall with the largest area in the battery cell, and the second wall 202 is installed across the first wall 201. In this case, the first wall 201 and the second wall 202 are not parallel, and the first wall 201 and the second wall 202 share a common line.

[0128] Alternatively, the battery cell 20 may have a substantially rectangular parallelepiped structure, 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 the battery cell 20 has a second wall 202 on at least one of its two sides in the second direction y, the battery cell 20 has the second wall 202 on at least one of its two sides in the vertical direction z, and the electrode terminal 214 may be provided on the second wall 202 of the battery cell 20 in the vertical direction z. Naturally, as shown in FIG. 6 , the electrode terminal 214 may be provided on the second wall 202 of the battery cell 20 in the second direction y.

[0129] The electrode terminal 214 is installed on the second wall 202, and the electrode terminal 214 is provided on a wall other than the first wall 201 of the battery cell 20 that intersects with the first wall 201, which makes it easy to install the electrode terminal 214 and at the same time allows the electrode terminal 214 and the reinforcing element 30, which will be described later, to escape. This eliminates the need to install an escape portion on the reinforcing element 30 to allow the electrode terminal 214 to escape, which is advantageous in simplifying the structure of the reinforcing element 30.

[0130] Alternatively, in the example shown in FIG. 6 , the battery cell 20 may be a blade battery, where the length of the battery cell 20 > the width of the battery cell 20 > the height of the battery cell 20, the length of the battery cell 20 in the second direction y > the width of the battery cell 20 in the vertical direction z > the height of the battery cell 20 in the first direction x, the first wall 201 is located at one end of the battery cell 20 in the height direction, and when the electrode terminal 214 is provided on the second wall 202, the electrode terminal 214 may be located at one end or both ends of the battery cell 20 in the length direction, and / or the electrode terminal 214 is located at one end or both ends of the battery cell 20 in the width direction.

[0131] Of course, in the present application, the installation position of the electrode terminal 214 is not limited to this. As shown in Figures 7 and 8, the electrode terminal 214 may be provided on the first wall 201, and the arrangement of the electrode terminal 214 is similarly easy, for example, if the battery cell 20 is a one-stop battery cell. As can be seen from this, the battery 100 in the embodiment of the present application has high flexibility in terms of the installation position of the electrode terminal 214.

[0132] In some embodiments, as shown in FIG. 8 , there are a plurality of battery cells 20, and the plurality of battery cells 20 are arranged in a first direction x. In the first direction x, each battery cell 20 has a first surface 203 facing a first wall 201, and a relief groove 203 a is provided in the first surface 203. The relief groove 203 a 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, thereby realizing a compact arrangement of the plurality of battery cells 20 in the first direction and saving occupied space.

[0133] In some embodiments, as shown in FIGS. 4 to 6 , the electrode terminal 214 is provided on the second wall 202, the battery cell 20 includes two first walls 201 arranged opposite to each other and two second walls 202 arranged opposite to each other, at least two electrode terminals 214 are arranged, and the multiple electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0134] Here, at least two electrode terminals 214 are installed on the same second wall 202, which is advantageous for saving the space occupied by the battery cell 20, provided that adjacent electrode terminals 214 are spaced apart appropriately. Alternatively, at least one electrode terminal 214 is installed on each second wall 202, which ensures that electrode terminals 214 located on different second walls 202 are spaced apart adequately.

[0135] For example, in the examples of Figures 4 and 5, the battery cell 20 includes two first walls 201 arranged opposite each other along a first direction x and two second walls 202 arranged opposite each other along a vertical direction z, where 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, and all of the multiple electrode terminals 214 are located on the same second wall 202 of the battery cell 20 in the vertical direction z.

[0136] In some embodiments, the electrode terminal 214 is installed on the second wall 202 of the battery cell 20 in the second direction y, or the electrode terminal 214 is installed on the second wall 202 of the battery cell 20 in the vertical direction z.

[0137] In the example of FIG. 11, the electrode terminal 214 is provided on the second wall 202 facing the bottom wall 102 in the vertical direction of the battery cell 20.

[0138] Of course, in a rectangular parallelepiped-shaped battery cell 20, the battery cell 20 may include two second walls 202 arranged opposite each other along the second direction y, where the second direction y is not parallel to the first direction, for example, the second direction y is perpendicular to the first direction x, and the multiple electrode terminals 214 are all located on the same second wall 202 in the second direction y of the battery cell 20.

[0139] 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 in sequence along the second direction y, the second walls 202 of two adjacent battery cells 20 face each other in the second direction y.

[0140] In the present application, the first wall 201 may be a flat or curved surface, and the second wall 202 may be a flat or curved surface.

[0141] In some embodiments, as shown in FIG. 9, the first wall 201 may be formed in a cylindrical shape, and the battery cell 20 may then be a substantially cylindrical battery cell.

[0142] 9 , when second walls 202 are provided on both axial ends of the first wall 201 and electrode terminals 214 are provided on at least one of the second walls 202, all of the electrode terminals 214 of the battery cells 20 are provided on one of the second walls 202, or at least one of the electrode terminals 214 of the battery cells 20 are provided on one of the second walls 202, and the remaining electrode terminals 214 of the battery cells 20 are provided on the other second wall 202. This allows flexible arrangement of the electrode terminals 214.

[0143] In some embodiments, as shown in FIG. 9 , one of the second walls 202 is provided with an exposed electrode terminal 214, and the electrode assembly 22 includes a positive electrode sheet 221 and a negative electrode sheet 222, one of which is electrically connected to the electrode terminal 214 and the other of which is electrically connected to the first wall 201, thereby realizing normal power supply to the battery cell 20.

[0144] Naturally, the other of the positive electrode sheet 221 and the negative electrode sheet 222 may be electrically connected to the other second wall 202, that is, the second wall 202 provided with the exposed electrode terminal 214 is different from the second wall 202 electrically connected to the other of the positive electrode sheet 221 and the negative electrode sheet 222, and similarly realizes normal power supply to the battery cell 20.

[0145] In some embodiments, at least one battery cell 20 is a soft-pack battery cell, and when the battery 100 includes one battery cell 20, the battery cell 20 is a soft-pack battery cell, and when the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a soft-pack battery cell. This increases the variety, structure, and layout of the battery 100, which is advantageous for meeting the needs of differentiating the applications of the battery 100.

[0146] In some embodiments, as shown in FIGS. 4 and 5 , the battery cell 20 further includes a pressure reducing mechanism 213, and the pressure reducing mechanism 213 and the electrode terminal 214 are installed on the same wall of the battery cell 20, for example, the pressure reducing mechanism 213 and the electrode terminal 214 are both installed on the second wall 202.

[0147] Of course, in other embodiments of the present application, the battery cell 20 further includes a pressure reducing mechanism 213, and the pressure reducing mechanism 213 and the electrode terminal 214 are respectively installed on the two walls of the battery cell 20.

[0148] This allows the pressure reducing mechanism 213 to have a certain degree of flexibility with respect to the position of the electrode terminal 214 .

[0149] At present, with the development of the market situation, the application of batteries is becoming more and more widespread. Batteries are not only applied to energy storage power systems such as hydroelectric power, thermal power, wind power and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in military equipment and aerospace, etc. As the application fields of batteries continue to expand, the demand for them in the market is also constantly increasing.

[0150] The applicant has noticed that if external water vapor penetrates into the inside of the housing, the inside of the housing will cause corrosion to the battery cells and other devices inside the housing, reducing the safety and service life of the battery. In related art, in order to improve the sealing performance of the battery, a sealing structure (such as a sealing plate) is additionally installed inside the housing, but the additionally installed sealing structure makes the battery structure more complicated and increases the cost.

[0151] In order to improve the safety and service life of the battery, the applicant has conducted research and discovered that by designing the housing itself into a sealed structure, it is possible to reduce the complexity of the battery structure and the cost of the battery.

[0152] In some embodiments, as shown in Figures 10 and 11, the housing 10 includes a main body 11 and a bottom cover 12 installed on the bottom of the main body 11, and the bottom cover 12 and the main body 11 together enclose and form a receiving cavity 10a.

[0153] The main body 11 may have a one-piece structure or may be formed by assembling multiple parts. The main body 11 may have a hollow housing structure that defines a first space, the bottom of which is open, and the bottom cover 12 is placed over the opening of the first space. The bottom cover 12 may have a hollow structure that is open on one side and may have a second space, with the second space of the bottom cover 12 and the first space of the main body 11 collectively forming the receiving cavity 10a. The bottom cover 12 itself may not have a space that forms the receiving cavity 10a, but when the bottom cover 12 is placed over the opening of the first space of the main body 11, the bottom cover 12 seals the first space of the main body 11 and is surrounded by both to form the receiving cavity 10a equivalent to the first space. In this case, the bottom cover 12 may have a flat structure. Naturally, the accommodating cavity 10a of the housing 10 may be formed in a portion of the first space of the main body 11, in which case the bottom cover 12 covers the opening of the first space, is recessed into the first space, and occupies a portion of the space of the first space, and the first space forms the accommodating cavity 10a of the housing 10 except for the portion of the space occupied by the bottom cover 12.

[0154] As can be understood, the bottom cover 12 is located at the bottom of the housing 10 and is used to define the receiving cavity 10a together with the main body 11. Specifically, the bottom cover 12 may have a plate-like structure, a block-like structure, or the like, but is not limited thereto, and may also have a flat plate-like, curved plate-like, or the like, but is not specifically limited thereto.

[0155] When the battery cells 20 are located in the receiving cavity 10a, the battery cells 20 may be installed in the bottom cover 12 and / or the main body 11. When the main body 11 is formed by assembling multiple components, the battery cells 20 may be installed on one or all of the components. In one embodiment, the main body 11 may include a top cover, a surrounding plate, and a support plate, the surrounding plate surrounding a third space having both vertically open ends, the top cover and the bottom cover 12 sealingly covering both vertical ends of the third space, the top cover (e.g., the mounting member 11a described below), the surrounding plate (e.g., the frame 11b described below), and the bottom cover 12 together surrounding the receiving cavity 10a, the support plate being located in the third space, and the battery cells 20 being supported by the support plate. In another embodiment, the main body 11 includes a mounting member 11a and a frame 11b, as described below, and more specifically as described below. In this application, the mounting member 11a can also be referred to as a support plate or a top plate, and the frame 11b can also be referred to as a side plate.

[0156] The bottom cover 12 and the main body 11 may be fixed to each other by welding, hot melt connection, adhesive bonding, fastening connection, interlocking, etc. Fastening connection refers to connection achieved by fastening members 13, which include bolts, plugs, rivets, pins, screws, etc. Interlocking refers to fixation achieved by an engagement structure, for example, the bottom cover 12 may have hooks and the main body 11 may have locking holes, and the hooks may be engaged into the locking holes to achieve the engagement and fixation between the bottom cover 12 and the main body 11. Of course, the connection methods between the bottom cover 12 and the main body 11 are not limited to these, and this application does not list all possible methods.

[0157] In some embodiments, the bottom cover 12 and the body 11 are hermetically connected and together form a sealed accommodating cavity 10a. At this time, the housing 10 is surrounded by its own bottom cover 12 and its own body 11 to form a sealed accommodating cavity 10a, and the airtightness of the battery 100 is ensured by the sealing property of the housing 10 itself, eliminating the need for any additional sealing structure. This simplifies the structure of the battery 100, reduces the cost of the battery 100, and ensures the safety and service life of the battery 100.

[0158] There are various ways to hermetically connect the bottom cover 12 and the main body 11, including, but not limited to, a sealing member installed between the bottom cover 12 and the main body 11, and the bottom cover 12 and the main body 11 being hermetically connected via the sealing member, or the bottom cover 12 and the main body 11 being hermetically connected via a sealant, or the bottom cover 12 and the main body 11 being inserted into each other and hermetically connected via a blocking structure formed by the insertion surface.

[0159] In the description herein, the bottom cover 12 of the battery 100 is located at the bottom of the body 11, i.e., in the vertical direction z shown in Figures 10 and 11, the bottom cover 12 is located at the bottom of the body 11. In actual use, the up-down direction shown in Figures 10 and 11 may be, but is not limited to, a vertical direction, and is determined according to the actual installation situation of the battery 100. Note that in the following description herein, the positional relationship, dimensions, etc. of each structure of the battery 100 are described based on the vertical direction, but this does not limit the structure or usage method of the battery 100, but is intended to make the description and explanation of the solution clearer.

[0160] In some embodiments, the bottom cover 12 is hermetically connected to the body 11 via a seal member.

[0161] The sealing member is a component that can prevent fluids or solid particles, etc., from leaking between adjacent joining surfaces and can prevent external foreign matter, such as dust and moisture, from entering the battery 100. The sealing member hermetically connects the main body 11 and the bottom cover 12 means that the sealing member is connected between two opposing surfaces of the main body 11 and the bottom cover 12, has an annular contact interface between the two surfaces, and can prevent external moisture from entering the inside of the battery 100 through the contact surface between itself and the two surfaces, thereby achieving a sealing effect.

[0162] The sealing member may be selected from a sealing ring or a gasket. Specifically, the sealing member may be selected from and manufactured using materials such as rubber and silicone. Specifically, the sealing member may be selected from an O-shaped sealing member, a square sealing member, an irregular-shaped sealing member, etc. The specific shape of the sealing member may be adapted to the shapes of the two opposing surfaces of the bottom cover 12 and the main body 11. For example, if the two opposing surfaces of the bottom cover 12 and the main body 11 are annular surfaces, the sealing member may be an O-shaped sealing member.

[0163] In this case, the bottom cover 12 achieves a sealed connection with the main body 11 via a sealing member, which ensures a reliable seal and low costs.

[0164] It should be noted that, after the bottom cover 12 is sealed to the main body 11 via the seal member, it may be fixedly connected to the main body 11 by other methods. Other methods include, but are not limited to, fastening, inserting, bolting, riveting, welding, adhesive, etc. It can be understood that when the bottom cover 12 is sealed to the main body 11 via a sealant, based on the adhesive properties of the sealant, as long as 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 fix the two together using other methods.

[0165] 10 and 11, the bottom cover 12 is removably connected to the bottom of the body 11. In this case, the body 11 may be directly attached to the mounting body, and the bottom cover 12 and the body 11 together form the receiving cavity 10a. When a component (such as a battery cell) in the receiving cavity a needs to be replaced or maintained, the component inside the battery 100 can be exposed by simply removing the bottom cover 12, allowing the component to be maintained or replaced without having to remove the entire battery 100 from the mounting body, greatly improving the convenience of battery 100 maintenance.

[0166] The bottom cover 12 and the main body 11 being detachably connected means that when the bottom cover 12 and the main body 11 are connected, the bottom cover 12 has two states: a first state in which it is completely connected to the main body 11 and forms the receiving cavity 10a, and a second state in which it is not completely connected to the main body 11 or is separated from the main body 11 and can be opened to expose the battery cells 20; and the bottom cover 12 can be switched from the first state to the second state and from the second state to the first state by external operation, without damaging any components in the process.

[0167] When the bottom cover 12 has a second state in which it is not completely connected to the main body 11 and opens the accommodating cavity 10a, the attachment method between the bottom cover 12 and the main body 11 may be such that the bottom cover 12 and the main body 11 are rotatably connected and fixedly connected via fasteners 13 or an engagement method. When the bottom cover 12 is rotated relative to the main body 11 to close the accommodating cavity 10a, the bottom cover 12 and the main body 11 are fixedly connected to the main body 11 via the fasteners 13 or an engagement method, and the battery cells 20 are accommodated in the accommodating cavity 10a and are hidden from view, and the bottom cover 12 is in the first state. When the fasteners 13 are removed or the engagement connection is released, the bottom cover 12 rotates relative to the main body 11 to open the accommodating cavity 10a and expose the battery cells 20, and the bottom cover 12 is in the second state. The bottom cover 12 and the main body 11 being rotatably connected may be, but is not limited to, the bottom cover 12 and the main body 11 being rotatably connected via a rotation shaft.

[0168] When the bottom cover 12 has a second state in which it is separated from the main body 11 and opens the receiving cavity 10a, the attachment method between the bottom cover 12 and the main body 11 may be such that the bottom cover 12 and the main body 11 are fixedly connected to each other only through the fastening members 13 or an engagement method. When the fastening members 13 are attached to the bottom cover 12 and the main body 11 or the engagement structures of the bottom cover 12 and the main body 11 are engaged to completely fasten the bottom cover 12 and the main body 11 and together form the receiving cavity 10a, the battery cells 20 are accommodated in the receiving cavity 10a and are hidden from view, and the bottom cover 12 is in the first state. When the fastening members 13 are removed or all engagement connections are released, the bottom cover 12 can be separated from the main body 11, exposing the battery cells 20, and the bottom cover 12 is in the second state.

[0169] When in the first state, the bottom cover 12 can, together with the main body 11, form an accommodation cavity 10a to protect the battery cell 20. When in the second state, the bottom cover 12 exposes the battery 100 main body, whereby an operator can easily perform maintenance or replacement on the battery cell 20.

[0170] In some embodiments, referring to FIG. 11, the bottom cover 12 and the main body 11 are removably connected via a fastening member 13.

[0171] The fastening member 13 refers to a member capable of integrally fastening and connecting two or more parts (or members), and may be, but is not limited to, a screw, a bolt, a rivet, a plug, a pin shaft, a stud weld, etc.

[0172] In this case, the bottom cover 12 and the main body 11 are removably connected via the fastening member 13, which is easy to attach and detach, has a simple structure, and is economical.

[0173] In some embodiments, as shown in FIGS. 14 and 15, the minimum thickness h of the bottom cover 12 satisfies 0.2 mm < h < 20 mm.

[0174] The thickness of the bottom cover 12 is the distance between the two vertical side surfaces of the bottom cover 12 in a vertical cross-section. The minimum thickness h of the bottom cover 12 is, that is, the shortest distance between the two vertical side surfaces of the bottom cover 12. When the thickness of each part of the bottom cover 12 is uniform, the bottom cover 12 can exhibit a flat plate shape (see FIG. 15), and the minimum thickness of the bottom cover 12 is, that is, the equal thickness of each part of the bottom cover 12. When the thickness of the bottom cover 12 is not uniform, the minimum thickness of the bottom cover 12 is, that is, the thickness of the thinnest part of the bottom cover 12.

[0175] Specifically, the minimum thickness h of the bottom cover 12 may be selected from 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.5 mm, 3.8 mm, 4 mm, 4.5 mm, 4.7 mm, 5 mm, 5.5 mm, 5.8 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, 16 mm, 16.5 mm, 17 mm, 17.5 mm, 18 mm, 18.5 mm, 19 mm, 19.5 mm, etc. Preferably, 0.5 mm ≤ h ≤ 3 mm.

[0176] At this time, when the minimum thickness h of the bottom cover 12 satisfies 0.2 mm < h < 20 mm, it has been proven that the weight of the battery 100 can be effectively reduced and the strength structure is reasonable.

[0177] In the description of the present application, based on the vertical direction, the "thickness" of a certain structure refers to the distance between the two side surfaces in the vertical direction of the structure in the vertical cross-section. In the following description, the "thickness" will not be overly explained, and reference can be made to the description here. Of course, for better understanding, the vertical direction is only for more easily explaining the solution means of the present application and does not limit the usage mode of the battery 100.

[0178] In some embodiments, the weight M2 of the battery cell 20 and the minimum thickness h of the bottom cover 12 satisfy 0.03 mm / Kg ≤ h / M2 ≤ 100 mm / Kg.

[0179] The weight M2 of the battery cell 20 is the weight M2 of one battery cell 20. When the battery 100 includes a plurality of battery cells 20, the weight of the battery cell 20 is the weight of each battery cell 20.

[0180] Specifically, the ratio of the minimum wall thickness h of the bottom cover 12 to the weight M2 of the battery cell 20 is 0.04 mm / Kg, 0.05 mm / Kg, 0.1 mm / Kg, 0.4 mm / Kg, 0.8 mm / Kg, 1 mm / Kg, 1.5 mm / Kg, 2 mm / Kg, 2.5 mm / Kg, 3 mm / Kg, 3.5 mm / Kg, 4 mm / Kg, 5 mm / Kg, 6 mm / Kg, 8 mm / Kg, 10 mm / Kg, 12 mm / Kg, It may be selected from 13mm / Kg, 15mm / Kg, 16mm / Kg, 18mm / Kg, 20mm / Kg, 30mm / Kg, 35mm / Kg, 40mm / Kg, 45mm / Kg, 50mm / Kg, 55 / Kg, 60mm / Kg, 65mm / Kg, 68mm / Kg, 70mm / Kg, 75mm / Kg, 80mm / Kg, 85mm / Kg, 90mm / Kg, 95mm / Kg, and 98mm / Kg.

[0181] Table 1. Effect 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 JPEG2025504528000002.jpg106130

[0182] Table 1 shows the test results of the effects of several ratios of the minimum thickness h of the bottom cover 12 to the weight m2 of the battery cells 20 on the safety performance of the battery 100 when tested in accordance with the GB38031-2020 "Safety Requirements for Power Storage Batteries for Electric Vehicles" standard. As can be seen from Table 1, when h / m2 is equal to 0.02 mm / kg, the battery 100 is prone to ignition and explosion, 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 high and the battery 100 is less likely to ignite or explode. However, if h / m is too large, space will be wasted and the energy density will be too low. Therefore, it is preferable that h / M2 does not exceed 100 mm / kg.

[0183] In this case, it has been proven that if the minimum thickness h of the bottom cover 12 and the weight m2 of the battery cell 20 satisfy the relationship 0.03 mm / Kg≦h / M2≦100 mm / Kg, the battery 100 not only has high structural strength, but also has a high energy density and is less likely to ignite or explode.

[0184] In some embodiments, referring also to Figures 10 to 12, the bottom cover 12 has a cover portion 12a and an attachment portion 12b, the attachment portion 12b is connected to surrounding the edge of the cover portion 12a, the cover portion 12a is used to define the receiving cavity 10a, and the attachment portion 12b is connected to the main body 11.

[0185] The phrase "cover portion 12a is used to define receiving cavity 10a" refers to the fact that cover portion 12a and main body 11 together surround receiving cavity 10a, while mounting portion 12b is connected to main body 11 and is not involved in defining receiving cavity 10a. Cover portion 12a may be a plate-like, block-like member, or a flat, curved, or curved plate-like member, and is not specifically limited. As can be seen from FIGS. 10 to 12 , the phrase "mounting portion 12b surrounds the edge of cover portion 12a" refers to the fact that mounting portion 12b is installed along the edge of cover portion 12a in a continuous, edge-to-edge, sealed structure. As can be seen, when projected vertically, mounting portion 12b has a certain width, which allows for an appropriate contact area with main body 11. This not only facilitates positioning and installation between mounting portion 12b and main body 11, but also facilitates the installation of a sealant and improves the sealing performance between mounting portion 12b and main body 11.

[0186] The cover portion 12a and the mounting portion 12b may be integrally molded. If the bottom cover 12 is made of a metal material (aluminum, iron, stainless steel, etc.), the cover portion 12a and the mounting portion 12b may be integrally molded using methods such as die casting, forging, hot pressing, or cold pressing. If the bottom cover 12 is made of a plastic material (PP, PE, ABS, etc.), the cover portion 12a and the mounting portion 12b may be integrally molded using injection molding. The cover portion 12a and the mounting portion 12b may be molded separately and then connected. If the cover portion 12a and the mounting portion 12b are made of a metal material, the cover portion 12a and the mounting portion 12b may be welded or glued. If the cover portion 12a and the mounting portion 12b are made of a plastic material, the cover portion 12a may be glued integrally with the mounting portion 12b. Of course, the cover portion 12a and the mounting portion 12b may also be fixedly connected using other methods such as clasping or riveting.

[0187] The cover portion 12a and the mounting portion 12b may be located in the same plane. Specifically, selectively, the two surfaces of the cover portion 12a and the mounting portion 12b facing the main 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 main body 11 are in the same plane. When the two surfaces of the cover portion 12a and the mounting portion 12b facing the main body 11 and the two surfaces of the cover portion 12a and the mounting portion 12b facing away from the main body 11 are respectively in the same plane, the cover portion 12a and the mounting portion 12b may form a flat bottom cover 12 (see FIG. 15).

[0188] The cover portion 12a and the mounting portion 12b do not have to be located in the same plane. Specifically, the cover portion 12a may be recessed toward the main body 11 relative to the mounting portion 12b, or the cover portion 12a may protrude toward the opposite side of the main body 11 relative to the mounting portion 12b, but this is not specifically limited. The thicknesses of the cover portion 12a and the mounting portion 12b may be the same or different, but this is not specifically limited.

[0189] In this case, the bottom cover 12 defines the receiving cavity 10a through the cover portion 12a, and is connected to the body 11 through the mounting portion 12b, so that the structure is clear and the mounting is easy.

[0190] As can be understood, when the bottom cover 12 and the main body 11 are hermetically connected, the bottom cover 12 is hermetically connected to the main body 11 via the mounting portion 12b, i.e., the mounting portion 12b is hermetically connected to the main body 11. The method of hermetically connecting the mounting portion 12b and the main body 11 may be a hermetically connected sealant, a hermetically connected sealant, etc., and not all methods are specifically listed. The sealant may be the sealant mentioned in the above description, and the installation method of the sealant can refer to the above, except that the sealant is installed between the mounting portion 12b and the main body 11. When the hermetically connected mounting portion 12b and the main body 11 is a sealant, the sealant may be applied to the entire contact surface of the mounting portion 12b and the main body 11.

[0191] As can be understood, when the bottom cover 12 and the main body 11 are detachably connected, the bottom cover 12 is detachably connected to the main body 11 via the mounting portion 12b, i.e., the mounting portion 12b is detachably connected to the main body 11. The manner in which the mounting portion 12b is detachably connected to the main body 11 can refer to the detachable manner between the bottom cover 12 and the main body 11 described above, and it is only necessary to set the position on the bottom cover 12 that is detachably connected to the main body 11 as the mounting portion 12b, and therefore the description of the detachable connection method between the mounting portion 12b and the main body 11 will be omitted here.

[0192] In some embodiments, the mounting portion 12b and the body 11 are removably connected.

[0193] Specifically, the bottom cover 12 further includes fixing holes 12c disposed in the mounting portions 12b, and the fasteners 13 are fastened to the main body 11 after passing through the fixing holes 12c of the mounting portions 12b. The fixing holes 12c are through-holes that pass vertically through the mounting portions 12b. Specifically, the fixing holes 12c may be smooth through-holes (when the fasteners 13 are rivets), threaded through-holes (when the fasteners 13 are screws), or other types of through-holes (such as hexagonal holes, square holes, or oval holes). The specific shape of the fixing holes 12c depends on the specific shape and installation method of the fasteners 13, and will not be described here.

[0194] In some embodiments, the cover portion 12a and the mounting portion 12b have the same thickness.

[0195] When the cover portion 12 and the mounting portion 12b are integrally molded, they can be integrally molded using the methods described above, such as die-cast integral molding, cold-press integral molding, hot-press integral molding, injection molding, etc., and the description thereof will be omitted here. Because the cover portion 12a and the mounting portion 12b have the same thickness, they can be quickly molded from the same metal plate by methods such as pressing and cutting.

[0196] In this case, the cover part 12a and the mounting part 12b have the same thickness, and the stress on each part is uniform during molding, which improves the molding rate of the one-piece molding. It can also be quickly processed by adopting a simple method such as cutting a plate material, and the structure of the bottom cover 12 is simpler and easier to process.

[0197] In some embodiments, referring to FIGS. 12 and 14, the cover portion 12a is disposed so as to protrude from the mounting portion 12b in a direction away from the receiving cavity 10a.

[0198] As can be seen from the above, the cover portion 12a defines the receiving cavity 10a, and the cover portion 12a protruding away from the receiving cavity 10a means that the cover portion 12a protrudes away from the main body 11. In other words, the cover portion 12a and the mounting portion 12b are vertically offset from each other, and the cover portion 12a is located at the bottom of the bottom cover 12. The cover portion 12a protrudes away from the accommodating cavity 10a relative to the mounting portion 12b, forming a certain amount of clearance between the cover portion 12a and the mounting portion 12b. This clearance increases the distance between the cover portion 12a and the battery cells 20. When an external force acts on the cover portion 12a, this clearance can reduce the external force and reduce or avoid damage to the battery cells 20. In particular, when the battery 100 is mounted on the bottom of the vehicle 1000 and the bottom cover 12 is located at the bottom of the battery 1000, even if stones or other objects on the ground fly up and strike the bottom of the battery 100, i.e., the bottom cover 12, while the vehicle 1000 is moving, the clearance can reduce the impact of the external force on the battery cells 20. At the same time, because the cover portion 12a protrudes relative to the mounting portion 12b, the cover portion 12a of the bottom cover 12 can function as a reinforcing structure for the bottom cover 12, improving the bending resistance of the bottom cover 12.

[0199] In some embodiments, a bottom cover 12 is located at the bottom of the housing 10 and is used to define a receiving cavity 10a, and the wall of the bottom cover facing the battery cell constitutes the bottom wall of the receiving cavity.

[0200] In some embodiments, referring to FIG. 16, the bottom cover 12 and the battery cell 20 are spaced apart.

[0201] The bottom cover 12 and the battery cells 20 being spaced apart means that a set distance r is maintained between the bottom cover 12 and the battery cells 20 in the vertical direction. The set distance r forms a buffer space between the bottom cover 12 and the battery cells 20, preventing external forces acting on the bottom cover 12 from being transmitted to the battery cells 20 and damaging the battery cells 20. In particular, if the battery 100 is attached to the bottom of the vehicle 1000 and the bottom cover 12 is located at the bottom of the battery 1000, even if stones or the like on the ground fly up and strike the bottom of the battery 100, i.e., the bottom cover 12, while the vehicle 1000 is traveling, the buffer space prevents external forces from being transmitted to the battery cells 20 and affecting them.

[0202] The manner in which the bottom cover 12 and the battery cells 20 are spaced apart may be as follows: the space is formed by the clearance between the protruding cover portion 12a and the mounting portion 12b in the above embodiment, and a set distance may also be maintained between one end of the battery cells 20 located within the main body 11 facing the bottom cover 12 and one end of the main body 11 facing the bottom cover 12, that is, the battery cells 20 are located only within a portion of the accommodating cavity 10a defined by the main body 11, but not within the accommodating cavity 10a defined by the bottom cover 12, thereby maintaining a set distance r between the battery cells 20 and the bottom cover 12 and ensuring the formation of a buffer space.

[0203] As can be understood, when multiple battery cells 20 are included in the battery 100, all of the battery cells 20 are spaced apart from the bottom cover 12. Furthermore, to standardize the dimensions of the battery cells 20, the spacing distance between each battery cell 20 and the bottom cover 12 is the same.

[0204] In some embodiments, referring to Figures 12, 13 and 15, the bottom cover 12 has a feature surface 12d facing the accommodating cavity 10a, and the feature surface 12d is configured as a flat surface, thereby reducing the occupation of the bottom cover 12 itself in the accommodating cavity 10a, allowing as much space as possible to be used for installing the battery cells 20, and improving the energy density and driving range of the battery.

[0205] The feature surface 12d facing the accommodating cavity 10a indicates that the feature surface 12d is an inner surface that can define the accommodating cavity 10a in the bottom cover 12. The feature surface 12d being configured as a plane means that, in the arrangement direction of the main body 11 and the bottom cover 12, the feature surface 12d is a plane perpendicular to the arrangement direction. In actuality, when the main body 11 and the bottom cover 12 are arranged along the vertical direction, the feature surface 12d of the bottom cover 12 is a plane parallel to a horizontal plane. When the main body 11 and the bottom cover 12 are arranged along the horizontal direction, the feature surface 12d of the bottom cover 12 is a plane parallel to a vertical plane.

[0206] When the characteristic surface 12d is flat, the characteristic surface 12d may maintain a uniform distance (which may be zero) between each battery cell 20 accommodated in the accommodation cavity 10a. When the distance between the characteristic surface 12d and the battery cells 20 is maintained uniform, the accommodation cavity 10a can accommodate more battery cells 20, i.e., the space utilization rate of the accommodation cavity 10a is higher, the battery 100 can have a higher energy density, and the driving range of the battery 100 is further improved.

[0207] As can be understood, when the bottom cover 12 has the cover portion 12a and the mounting portion 12b, the characteristic surface 12d may be formed by an inner surface structure of the cover portion 12a facing the accommodating cavity 10a. As can be further understood, when the bottom cover 12 and the battery cell 20 are installed with a gap therebetween, the characteristic surface 12d and the battery cell 20 are disposed with a gap therebetween.

[0208] In some embodiments, the outer surface of the cover portion 12a facing away from the receiving cavity 10a is parallel to the feature surface 12d.

[0209] The outer surface of the cover part 12a away from the receiving cavity 10a and the characteristic surface 12d are arranged vertically opposite each other. The outer surface of the cover part 12a is in contact with the atmosphere and is used to receive external forces. When the outer surface of the cover part 12a is flush with the characteristic surface 12d, particularly when the bottom cover 12 and the main body 11 are arranged vertically at the bottom of the vehicle 1000, the bottom cover 12 is located at the bottom of the battery 100, and the outer surface of the cover part 12a is flat, the air resistance generated by the battery 100 can be significantly reduced, reducing the running resistance of the vehicle 1000, reducing the energy consumption during running of the vehicle 1000, and improving the driving range of the battery 100.

[0210] Fig. 17 is a schematic diagram of a vertical orthographic projection of the bottom cover 12 shown in Fig. 13. S1 indicates the projected area of ​​the characteristic surface 12d, and S2 indicates the projected area of ​​the bottom cover 12.

[0211] In some embodiments, the area S1 of the orthogonal projection of the feature surface 12d and the area S2 of the orthogonal projection of the bottom cover 12 in the vertical direction satisfy S1 / S2≧0.2, or S1 / S2≧0.5.

[0212] 17 , in vertical orthogonal projection, the feature surface 12d is formed by connecting and surrounding both ends of the first feature edge d1, the second feature edge d2, the third feature edge d3, and the fourth feature edge d4, and the orthogonal projection area S1 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 orthogonal projection area S2 of the bottom cover 12 is the area defined by the edges of the bottom cover 12. Specifically, the ratio of the orthogonal projection area S1 of the feature surface 12d to the orthogonal projection area S2 of the bottom cover 12 may be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0213] Table 2. Effect of the ratio of area S1 to area S2 on the driving range of battery 100 JPEG2025504528000003.jpg66130

[0214] Table 2 shows the effects of several ratios of the orthogonal projection area S1 of the characteristic surface 12d to the orthogonal projection area S2 of the bottom cover 12 on the driving range of the battery 100, as determined by tests conducted in accordance with the NEDC (New European Driving Cycle) standard. If S1 / S2 is less than 0.2, the driving range of the battery 100 is short. This is because if the characteristic surface 12d is small, the space utilization of the receiving cavity 10a is low, the number of battery cells 20 accommodated in the battery 100 is small, and the energy density of the battery 100 is low, which shortens the driving range of the battery 100 and worsens the test results. When the ratio of S1 / S2 is 0.2 or more (especially when S1 / S2 is 0.5 or more), the larger the ratio, the longer the driving range of the battery 100, because the larger the characteristic surface 12d, the higher the space utilization rate of the receiving cavity 10a and the higher the energy density of the battery 100, and therefore the longer the driving range of the battery 100 and the better the test results.

[0215] Because the characteristic surface 12d is a flat surface, the larger the area occupied by the characteristic surface 12d on the bottom cover 12, the smaller the area of ​​the inner surface of the bottom cover 12 that is recessed or protruding toward the characteristic surface 12d. The recessed inner surface relative to the characteristic surface 12d creates an irregularity in the space within the accommodating cavity 10a, making it impossible to install the battery cells 20, and reducing the space utilization rate of the accommodating cavity 10a. The irregularity in the space within the accommodating cavity 10a formed by the inner surface protruding from the characteristic surface 12d also makes it impossible to accommodate the battery cells 20, reducing the space utilization rate of the accommodating cavity 10a. If the space utilization rate of the accommodating cavity 10a is low, the volume occupied by the battery cells 20 per unit space within the battery 100 becomes small, resulting in a low energy density of the battery 100. Therefore, the larger the area occupied by the characteristic surface 12d on the bottom cover 12, the higher the space utilization rate of the battery 100, the higher the energy density of the battery 100, and the longer the driving range of the battery 100.

[0216] In some embodiments, see FIG. 17, in the vertical direction, the orthographic projection of the feature surface 12d presents a rectangle.

[0217] 17, the rectangular feature surface 12d is an area surrounded and defined by a first feature edge d1, a second feature edge d2, a third feature edge d3, and a fourth feature edge d4. In the battery 100, most of the battery cells 20 are assembled to form a rectangular structure, and the rectangular feature surface 12d can be adapted to the overall structure formed by the battery cells 20 in the battery 100, which helps to arrange more battery cells 20 in the accommodating cavity 10a and improves the energy density of the battery 100.

[0218] Of course, in other embodiments, the orthographic projection of the feature surface 12d in the vertical direction may take on other shapes, such as circles, polygons, ellipses, and other irregular shapes.

[0219] In the embodiment of the present application, the main body 11 includes a mounting member 11a. The mounting member 11a may be a member for defining the receiving cavity 10a in the main body 11 (for example, the mounting member 11a is the above-mentioned top cover or frame), or a member that is not a member for defining the receiving cavity 10a but is located within the receiving cavity 10a (for example, the mounting member 11a is the above-mentioned support plate), and is not specifically limited. When the mounting member 11a is used to define the receiving cavity 10a, the mounting member 11a may be a member that is directly connected to the bottom cover 12 in the main body 11 (for example, the above-mentioned frame), or a member that is not connected to the bottom cover 12 (for example, the above-mentioned top cover).

[0220] In some embodiments, a mounting member 11a is provided on the top of the housing 10, and the battery cells 20 are provided on the surface of the mounting member 11a.

[0221] In this case, the mounting member 11a is a member capable of supporting the weight of the battery cells 20, and may be a mounting plate, mounting rod, mounting block, mounting sheet piece, mounting frame, mounting wire, or the like, but is not specifically limited. Specifically, the battery cells 20 may be supported by the mounting member 11a, in which case the battery cells 20 may be installed above the mounting member 11a. Specifically, the battery cells 20 may be suspended from the mounting member 11a, in which case the battery cells 20 may be suspended from a wall surface of the mounting member 11a that is parallel to the direction of gravity of the battery cells 20.

[0222] The battery cells 20 may be installed above the mounting member 11a (for example, when the mounting member 11a is a support plate located within the accommodating cavity 10a), the battery cells 20 may be installed below the mounting member 11a (for example, when the mounting member 11a is a top cover for defining the accommodating cavity 10a), or the battery cells 20 may be installed to the side of the mounting member 11a (for example, when the mounting member 11a is a frame for defining the accommodating cavity 10a).

[0223] In some embodiments, the battery cells 20 and the mounting member 11a are adhesively connected, which can reduce the required dimension in the vertical direction Z when the battery cells 20 are connected to the mounting member 11a, thereby reducing the overall thickness of the battery. Illustratively, the mounting member 11a is used to define the receiving cavity 10a, and the battery cells 20 are suspended from the mounting member 11a.

[0224] Specifically, the battery cells 20 and the mounting member 11a may be bonded with an adhesive such as an epoxy resin adhesive or an acrylic resin adhesive, but the type of adhesive is not limited to this. In this case, bonding the battery cells 20 and the mounting member 11a facilitates connection and simplifies the structure of the battery 100.

[0225] In some embodiments, the wall of the mounting member 11a facing the battery cells 20 constitutes the ceiling wall 101 of the accommodating cavity 10a, and for example, the battery cells 20 may be provided on the ceiling wall 101 of the accommodating cavity 10a.

[0226] In some embodiments, as shown in FIG. 21, the battery cell 20 is installed on the surface of the placement member 11a, and the minimum thickness H of the placement member 11a and the weight M1 of the battery 100 satisfy 0.0002 mm / kg < H / M1 ≤ 0.2 mm / kg. At this time, the placement member 11a may be used to carry the weight of the battery cell 20, and the battery 100 has high structural strength, no problems of explosion and fire, and at the same time, the battery has a high energy density and better battery endurance.

[0227] The thickness of the placement member 11a refers to the distance between the surface on the side where the battery cell 20 is installed and the opposite surface in the placement member 11a. When the battery cell 20 is installed on the vertical surface of the placement member 11a, the minimum thickness H of the placement member 11a refers to the location where the distance between the two vertical surfaces of the placement member 11a is the smallest. When the battery cell 20 is on the horizontal surface of the placement member 11a, the thickness of the placement member 11a refers to the location where the distance between the two horizontal surfaces of the placement member 11a is the smallest.

[0228] The weight of the battery 100 includes the total weight of the main body 11, the bottom cover 12, the battery cell 20 and other components (such as wire harness, thermal management system, power management system, etc.).

[0229] Specifically, the ratio between the minimum thickness H of the placement member 11a and the weight M1 of the battery 100 may be designed to be 0.0003 mm / kg, 0.0005 mm / kg, 0.0008 mm / kg, 0.001 mm / kg, 0.003 mm / kg, 0.005 mm / kg, 0.008 mm / kg, 0.01 mm / kg, 0.03 mm / kg, 0.05 mm / kg, 0.06 mm / kg, 0.08 mm / kg, 0.1 mm / kg, 0.12 mm / kg, 0.15 mm / kg, 0.16 mm / kg, 0.19 mm / kg, 0.02 mm / kg.

[0230] Table 3 Influence of the ratio of the minimum thickness H of the placement member 11a to the weight M1 of the battery 100 on the safety performance of the battery 100 JPEG2025504528000004.jpg98130

[0231] Table 3 shows the results of the influence of several ratios between the minimum thickness H of the placement member 11a and the weight M1 of the battery 100 on the safety performance of the battery 100, where the test is conducted in accordance with the GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles" standard. As can be seen from Table 3, when the value of the H / M ratio does not exceed 0.0002 mm / Kg, the battery 100 will explode, and the reason is that the structural strength of the battery 100 does not meet the requirements. When the value of the H / M ratio exceeds 0.0002 mm / Kg, the battery 100 will not explode. However, if H / M is too large (for example, when it exceeds 0.1), due to the small weight of the battery 100 and the large thickness of the placement plate, the occupancy rate of the battery cells 20 per unit volume of the battery 100 will be low, the space utilization rate will decrease, the energy density of the battery 100 will be too low, and the usage cost of the battery 100 will increase. Furthermore, when 0.0005 mm / Kg ≤ H / M ≤ 0.1 mm / Kg, the structural strength of the battery 100 meets the requirements, the energy density of the battery 100 is high, the endurance ability of the battery 100 is higher, and no safety accidents such as ignition and explosion will occur.

[0232] In some embodiments, the minimum thickness H of the placement member 11a satisfies 0.2 mm < H < 20 mm.

[0233] Specifically, the minimum thickness H of the placement member 11a may be 0.3 mm, 0.5 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 12 mm, 15 mm, 16 mm, 18 mm, 19 mm. Furthermore, when 0.5 mm ≤ H ≤ 10 mm, the placement member 11a has good structural strength, the overall strength of the battery 100 is high, and the battery 100 is less likely to catch fire and explode. At the same time, the volume occupancy of the placement member 11a with respect to the entire battery 100 is small, the space utilization rate of the battery 100 is high, and the energy density of the battery 100 is high.

[0234] 11, 16, and 27, in some embodiments, the battery cells 20 are suspended from a mounting member 11a. Illustratively, the mounting member 11a is used to define the receiving cavity 10a, and the battery cells 20 are suspended from the mounting member 11a.

[0235] The battery cells 20 being suspended from the mounting member 11a means that the battery cells 20 are installed vertically below the mounting member 11a and the mounting member 11a supports the weight of the battery cells 20. The manner in which the battery cells 20 are suspended from the mounting member 11a includes the following: the battery cells 20 are directly bonded to the lower surface of the mounting member 11a; the battery cells 20 are connected to the mounting member 11a via fastening members 13 and are positioned below the mounting member 11a; or the battery cells 20 are suspended from the mounting member 11a via hooks or the like and are positioned below the mounting member 11a.

[0236] In this case, the battery cells 20 are suspended below the mounting member 11a, and the bottom cover 12 is located at the bottom of the housing 10. When performing maintenance on the inside of the battery 100, the battery cells 20 can be exposed by removing the bottom cover 12, eliminating the need to remove the mounting member 11a, and making maintenance of the battery 100 easier. At the same time, when performing maintenance on the battery 100, the battery cells 20 can be attached and detached from the mounting member 11a from below. In particular, when the mounting member 11a is subjected to force as at least part of the chassis of the vehicle 1000, maintenance of the battery 100 is easier because the battery cells 20 can be attached and detached only from below the mounting member 11a, eliminating the need to remove the mounting member 11a.

[0237] In some embodiments, referring to Figures 18 and 46 together, the outer surface of the battery cell 20 facing the mounting member 11a is the first outer surface m1 (which may also be understood as the ceiling wall 204 of the battery cell 20 described in this application), and the electrode terminal 214 is arranged on an outer surface of the battery cell 20 other than the first outer surface m1.

[0238] As described above, the electrode terminals 214 are used to electrically connect to the electrode assemblies 23 inside the battery cells 20, thereby serving as components for outputting or inputting electrical energy to or from the battery cells 20. At least a portion of the electrode terminals 214 extends outside the battery cells 20, thereby providing electrical connection to the outside. The series and parallel connections between the battery cells 20 are achieved by connecting the respective electrode terminals 214 in series or parallel. The electrode terminals 214 are conductive and can conduct electricity, and may be aluminum electrodes, copper electrodes, etc.

[0239] The electrode terminals 214 are disposed on an outer surface of the battery cell 20 other than the first outer surface m1. The first outer surface m1 faces the mounting member 11a and is a generally smooth surface on which the electrode terminals 214, the inlet hole structure, etc. are not protruding or recessed. When the battery cell 20 is suspended on the mounting member 11a, the first outer surface m1 is the outer surface of the battery cell 20 facing upward. Specifically, in one embodiment, the battery cell 20 includes the above-mentioned housing 211 and end cover 212, which form an internal environment of the battery cell 20 that accommodates the electrode assembly 23. The end cover 212 is located at one end of the housing 211, and the electrode terminals 214 are disposed on the end cover 212. In this case, any outer surface of the housing 211 may be the first outer surface m1 of the battery cell 20.

[0240] The electrode terminals 214 include a positive terminal and a negative terminal, the positive terminal being used to electrically connect to the positive electrode sheet in the electrode assembly 23, and the negative terminal being used to electrically connect to the negative electrode sheet in the electrode assembly 23. The positive terminal and the negative terminal may be disposed on the same outer surface of the battery cell 20 (e.g., a rectangular battery cell 20), or may be disposed on two different outer surfaces of the battery cell 20 (e.g., a cylindrical battery cell 20). When the positive terminal and the negative terminal are disposed on two different outer surfaces of the battery cell 20, the first outer surface m1 is a surface different from the two outer surfaces of the battery cell 20.

[0241] In addition to the battery cells 20, the battery 100 typically includes components such as a sampling harness electrically connected to each battery cell 20, a high-voltage harness, and a protective structure for protecting the battery cell 20. In this case, the electrode terminals 214 are disposed on a surface other than the first outer surface m1 of the battery cells 20. When components such as the sampling wire harness, high-voltage wire harness, and protective structure are attached to the electrode terminals 214, these components can be placed through the space between the battery cells 20 and other structures of the main body 11 other than the mounting member 11a (e.g., the space between the battery cells 20 and the bottom cover and / or the space between the battery cells and the inner surface of the main body) without being restricted by the mounting member 11a, making installation of these components easier. At the same time, because the first outer surface m1 is a smooth surface, it can be brought into close contact with the mounting member 11a, achieving close contact and attachment between the battery cells 20 and the mounting member 11a. This eliminates the need for a space between the battery cells 20 and the mounting member 11a, thereby improving the space utilization rate of the battery 100.

[0242] In some embodiments, also referring to FIG. 18 , the battery cell 20 has a second outer surface m2 (which may be understood as the bottom wall 205 of the battery cell 20 described in this application) located opposite the first outer surface m1, and the electrode terminal 214 is arranged on the second outer surface m2.

[0243] The second outer surface m2 is an outer surface located opposite the first outer surface m1 of the battery cell 20. When the battery cell 20 is suspended from the mounting member 11a, the second outer surface m2 faces the bottom cover 12. As described above, the battery cell 20 and the bottom cover 12 may be spaced apart. In this case, a buffer space is provided between the second outer surface m2 and the bottom cover 12, and the portions of the electrode terminals 214 that extend outside the battery cell 20 are located within the buffer space. This allows the wiring harness and connection tabs connected to the electrode terminals 214 to be positioned within the buffer space. At the same time, the buffer space prevents external force striking the bottom cover 12 from acting on the battery cell 20 and damaging it, as described above. Therefore, the buffer space not only blocks the influence of external force but also provides a place for the placement of wiring harnesses and the like, achieving two-for-one benefits. It also improves the space utilization of the buffer space and the battery 100.

[0244] Of course, in other embodiments, referring to FIG. 46, the electrode terminal 214 may be disposed on a third outer surface m3 of the battery cell 20 that intersects with the first outer surface m1.

[0245] 11 and 16, in some embodiments, the mounting member 11a is located on the top of the housing 10 and is used to define the receiving cavity 10a. The bottom cover 12 is located at the bottom of the housing 10, so the mounting member 11a and the bottom cover 12 are disposed opposite each other. The mounting member 11a is a structure on the top of the housing 10, and the housing 10 can be attached to a mounting body via the mounting member 11a. In this case, the battery cells 20 mounted on the mounting member 11a can reinforce the strength of the mounting member 11a, thereby improving the rigidity of the top of the battery 100 and expanding the application scenarios of the battery 100 to situations where the top is subjected to force, such as when used as part of the chassis of a vehicle 1000.

[0246] In some embodiments, as shown in FIGS. 20 and 22, the mounting member 11a has a mounting surface 12f facing the receiving cavity 10a, and the mounting surface 12f is configured as a flat surface.

[0247] The mounting surface 12f is the inner surface of the mounting member 11a facing the receiving cavity 10a and is used to define the receiving cavity 10a. The mounting surface 12f being flat means that the mounting surface 12f is a plane perpendicular to the direction of arrangement of the main body 11 and the bottom cover 12. In actuality, when the main body 11 and the bottom cover 12 are arranged vertically, the mounting member 11a and the bottom cover 12 are arranged opposite each other along the vertical direction, and the mounting surface 12f of the mounting member 11a is a plane parallel to the horizontal plane. When the main body 11 and the bottom cover 12 are arranged horizontally, the mounting member 11a and the bottom cover 12 are arranged opposite each other along the horizontal direction, and the mounting surface 12f of the mounting member 11a is a plane parallel to the vertical plane.

[0248] As shown in Figures 20 and 30, the mounting member 11a may be the entire inner surface of the mounting member 11a facing the storage cavity 10a, in which case the mounting member 11a may be flat. As shown in Figures 21 and 22, the mounting member 11a may be a part of the inner surface of the mounting member 11a facing the storage cavity 10a, in which case the mounting surface 12f is only the part of the inner surface of the mounting member 11a that is used to define the storage cavity 10a.

[0249] When the mounting surface 12f is flat, the mounting surface 12f may maintain a uniform distance (which may be zero) between each battery cell 20 accommodated in the accommodating cavity 10a. When the distance between the mounting surface 12f and the battery cells 20 is maintained uniform, more battery cells 20 can be accommodated in the accommodating cavity 10a, i.e., the space utilization rate of the accommodating cavity 10a is higher, the battery 100 can have a higher energy density, and the cruising capability of the battery 100 is further improved.

[0250] In some embodiments, the battery cells 20 are mounted on the mounting surface 12f. The battery cells 20 are attached to the mounting member 11a via the mounting surface 12f. In this case, when assembling the battery, the mounting member can be first attached, and then the battery cells can be attached by lifting them up from below. Particularly when the mounting member is at least part of a vehicle chassis, the mounting member can be first attached to a mounting body as a load-bearing structure, and then the battery cells can be attached by lifting them up from below, making battery assembly easier. The battery cells suspended from the mounting member can reinforce the strength of the mounting member, thereby improving the rigidity of the upper part of the battery, thereby expanding the application scenarios of the battery to situations where the upper part is subjected to force, such as when used as part of a vehicle chassis.

[0251] The battery cells 20 may be glued to the mounting surface 12f, or may be fixedly connected to the mounting surface 12f via fastening members 13 or the like, or may be welded or fastened to the mounting surface 12f, and there are no specific limitations.

[0252] Because the mounting surface 12f is flat, it can have a large contact area with the battery cells 20 installed thereon, further stabilizing the installation of the battery cells 20. At the same time, because the mounting surface 12f is flat, it can achieve connection with more battery cells 20 than an uneven surface such as a curved surface, allowing the number of battery cells 20 installed in the battery 100 to be increased, thereby improving the space utilization rate and energy density of the battery 100.

[0253] As can be seen, when the battery cells 20 are suspended from the mounting member 11a, the battery cells 20 are suspended from the mounting surface 12f.

[0254] In some embodiments, the area N1 of the orthogonal projection of the mounting surface 12f and the area N2 of the orthogonal projection of the mounting member 11a in the vertical direction satisfy N1 / N2≧0.2, or further, N1 / N2≧0.5.

[0255] 22, in the vertical orthogonal projection, the mounting surface 12f is formed by connecting and surrounding both ends of the first mounting side f1, the second mounting side f2, the third mounting side f3, and the fourth mounting side f4, and the orthogonal projection area N1 of the mounting surface 12f is the area defined by the first mounting side f1, the second mounting side f2, the third mounting side f3, and the fourth mounting side f4. The orthogonal projection area N2 of the mounting member 11a is the area defined by the edges of the mounting member 11a.

[0256] Specifically, the ratio of the area N1 of the orthogonal projection of the mounting surface 12f to the area N2 of the orthogonal projection of the mounting member 11a may be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.

[0257] Table 4. Effect of the ratio of area N1 to area N2 on the driving range of battery 100 JPEG2025504528000005.jpg54130

[0258] Table 4 shows the influence of several ratios of the orthogonal projection area N1 of the mounting surface 12f to the orthogonal projection area N2 of the mounting member 11a on the cruising range of the battery 100 when testing is performed according to the NEDC (New European Driving Cycle) standard. If S1 / S2 is less than 0.2, the cruising range of the battery 100 is short. This is because if the mounting surface 12f is small, the number of battery cells 20 mounted on the mounting member 11a is small, the space utilization of the accommodating cavity 10a is low, and the energy density of the battery 100 is low. This shortens the cruising range of the battery 100 and deteriorates the test results. When the ratio of S1 / S2 is 0.2 or greater (especially when S1 / S2 is 0.5 or greater), the larger the ratio, the longer the driving range of the battery 100. This is because the larger the mounting surface 12f, the more battery cells 20 can be mounted on the mounting member 11a, improving the space utilization of the accommodating cavity 10a and increasing the energy density of the battery 100, thereby increasing the driving range of the battery 100 and improving the test results. When the mounting member 11a has a flat structure as shown in Figure 20, the orthographic projection area N1 of the mounting surface 12f is equal to the orthographic projection area N2 of the mounting member 11a, and the driving range of the battery 100 is the best.

[0259] In some embodiments, in the vertical direction, the orthographic projection of the rest surface 12f presents a rectangle.

[0260] 22, the rectangular mounting surface 12f is a defined area surrounded by a first mounting side f1, a second mounting side f2, a third mounting side f3, and a fourth mounting side f4. In the battery 100, most of the battery cells 20 are assembled to form a rectangular structure, and the rectangular configuration of the mounting surface 12f can be adapted to the overall structure formed by the battery, which helps to arrange more battery cells 20 in the accommodating cavity 10a and improves the energy density of the battery 100.

[0261] Of course, in other embodiments, the orthographic projection of the rest surface 12f in the vertical direction may have other shapes, such as a circle, a polygon, an ellipse, and other irregular shapes.

[0262] In some embodiments, referring to FIG. 21, the mounting member 11a has a mounting portion 11a1 and a connecting portion 11a2, the connecting portion 11a2 is connected around the edge of the mounting portion 11a1, the mounting portion 11a1 is used to define the accommodating cavity 10a, and the connecting portion 11a2 is connected to a portion of the housing 10 other than the mounting member 11a.

[0263] The mounting portion 11a1 is used to define the receiving cavity 10a, while the connecting portion 11a2 is used to connect to a portion of the housing 10 other than the mounting member 11a and is not involved in defining the receiving cavity 10a. The mounting portion 11a1 may be a plate-shaped or block-shaped member, or a flat or curved plate-shaped member, and is not specifically limited. As can be seen from FIG. 21 , the connecting portion 11a2 surrounding the edge of the mounting portion 11a1 refers to the structure in which the connecting portion 11a2 is connected end to end continuously along the edge of the mounting portion 11a1. As can be seen, the connecting portion 11a2 has a certain width when projected vertically, which allows it to have an appropriate contact area with other structures other than the mounting member 11a of the housing 10 and makes it easier to attach and connect the connecting portion 11a2 to other structures other than the mounting member 11a of the housing 10.

[0264] The mounting portion 11a1 and the connecting portion 11a2 may be integrally molded. If the mounting member 11a is made of a metal material (aluminum, iron, stainless steel, etc.), the mounting portion 11a1 and the connecting portion 11a2 may be integrally molded by employing a method such as die casting, forging, hot pressing, or cold pressing. If the mounting member 11a is made of a plastic material (PP, PE, ABS, etc.), the mounting portion 11a1 and the connecting portion 11a2 may be integrally molded by employing injection molding. The mounting portion 11a1 and the connecting portion 11a2 may be connected after being molded separately. If the mounting portion 11a1 and the connecting portion 11a2 are made of a metal material, the mounting portion 11a1 and the connecting portion 11a2 may be welded or bonded. If the mounting portion 11a1 and the connecting portion 11a2 are made of a plastic material, the cover portion 12a and the mounting portion 12b may be bonded. Of course, the mounting portion 11a1 and the connecting portion 11a2 may be fixedly connected by other methods such as fastening or riveting.

[0265] Specifically, the connecting portion 11a2 and the portion of the main body 11 other than the mounting member 11a are connected, and the connection method may be integral molding or fixed connection. When the connecting portion 11a2 and the portion of the main body 11 other than the mounting member 11a are integrally molded, that is, when the main body 11 is an integrally molded member, the integral molding may be performed by methods such as die casting, forging, hot pressing, cold pressing, injection molding, etc. When the connecting portion 11a2 and the portion of the main body 11 other than the mounting member 11a are fixedly connected, the fixed connection may be performed by a fastening connection via the fastening member 13, a locking connection with an engaging structure, etc., and is not specifically limited.

[0266] The mounting portion 11a1 and the connecting portion 11a2 may be located in the same plane. Specifically, selectively, the two surfaces of the mounting portion 11a1 and the connecting portion 11a2 facing the bottom cover 12 are in the same plane, and / or the two surfaces of the mounting portion 11a1 and the connecting portion 11a2 facing the bottom cover 12 are in the same plane. When the two surfaces of the mounting portion 11a1 and the connecting portion 11a2 facing the bottom cover 12 and ... are both in the same plane, respectively, the mounting portion 11a1 and the connecting portion 11a2 may form a flat mounting member 11a (see FIG. 20).

[0267] The mounting portion 11a1 and the connecting portion 11a2 may not be located in the same plane. Specifically, the mounting portion 11a1 may protrude away from the receiving cavity 10a relative to the connecting portion 11a2, or the mounting portion 11a1 may be recessed toward the receiving cavity 10a relative to the connecting portion 11a2, but this is not specifically limited. The thicknesses of the mounting portion 11a1 and the connecting portion 11a2 may be equal or different, but this is not specifically limited.

[0268] In this case, the mounting member 11a defines the receiving cavity 10a via the mounting portion 11a1, and realizes connection to the structure of the main body 11 other than the mounting member 11a via the connecting portion 11a2, resulting in a clear structure.

[0269] As can be understood, when the mounting member 11a includes the mounting portion 11a1 and the connection portion 11a2, the battery cell 20 is placed on the mounting portion 11a1.

[0270] As can be understood, when the mounting member 11a includes the mounting portion 11a1 and the connecting portion 11a2, the inner surface structure of the mounting portion 11a1 facing the receiving cavity 10a forms the mounting surface 12f.

[0271] In some embodiments, the mounting portion 11a1 is disposed so as to protrude in a direction away from the receiving cavity 10a relative to the connecting portion 11a2.

[0272] As can be seen from the above, the mounting portion 11a1 defines the receiving cavity 10a, and the mounting portion 11a1 protruding away from the receiving cavity 10a means that the mounting portion 11a1 and the connecting portion 11a2 are vertically offset from each other. The mounting portion 11a1 is located at the top of the mounting member 11a. In this case, a certain space as part of the receiving cavity 10a may be formed between the mounting portion 11a1 and the connecting portion 11a2, and this space can accommodate a battery cell 20.

[0273] When the mounting portion 11a1 protrudes away from the receiving cavity 10a relative to the connecting portion 11a2, the mounting portion 11a1 can serve as a reinforcing structure for the mounting member 11a, thereby improving the bending resistance of the mounting member 11a.

[0274] In some embodiments, the thickness of the mounting portion 11a1 and the connecting portion 11a2 are equal.

[0275] When the mounting portion 11a1 and the connecting portion 11a2 are the same thickness, the mounting portion 11a1 and the connecting portion 11a2 can be integrally molded from the same plate material by die casting, cold pressing, or hot pressing, which makes it easier to mold the mounting member 11a. At the same time, because the mounting portion 11a1 and the connecting portion 11a2 have the same thickness, the stress at each portion is uniform during molding, which improves the molding rate of the mounting member 11a.

[0276] In some embodiments, the outer surface of the mounting portion 11a1 facing away from the receiving cavity 10a is parallel to the mounting surface 12f.

[0277] The outer surface of the mounting portion 11a1, which is away from the receiving cavity 10a, and the mounting surface 12f are arranged facing each other in the vertical direction. The outer surface of the mounting portion 11a1 can be exposed to the atmospheric environment. When the battery 100 is attached to the vehicle 1000, the mounting portion 11a1, which has a flat outer surface, can reduce the running resistance of the vehicle 1000, reduce the energy consumption of the vehicle 1000, and improve the driving range of the battery 100.

[0278] In some embodiments, referring to Figures 10 and 11, the main body 11 includes a frame 11b and a mounting member 11a, the frame 11b encloses and forms an enclosed space 10q that is installed by penetrating both vertical ends, the bottom cover 12 and the mounting member 11a are respectively placed on opposite vertical ends of the enclosed space 10q, and the bottom cover 12, the frame 11b and the mounting member 11a together enclose and form the receiving cavity 10a.

[0279] The frame 11b itself encloses and forms an enclosed space 10q that penetrates both vertical ends, the mounting 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 mounting member 11a is located at the top of the housing 10 and is used to define the receiving cavity 10a, and the bottom cover 12 is located at the bottom of the housing 10 and is used to define the receiving cavity 10a. The frame 11b, mounting member 11a, and bottom cover 12 enclose and form the receiving cavity 10a. The frame 11b, mounting member 11a, and bottom cover 12 may be made of the same material, such as aluminum alloy, copper alloy, steel, or plastic. Of course, the frame 11b, mounting member 11a, and bottom cover 12 may be made of different materials, and the materials are not specifically limited. In the vertical orthogonal projection, the frame 11b may be rectangular, circular, polygonal, etc., and is not specifically limited.

[0280] The frame 11b is parallel to the vertical direction, is installed around the battery cells 20, and connects the mounting member 11a and the bottom cover 12. When the mounting member 11 includes the mounting portion 11a1 and the connecting portion 11a2, the mounting member 11a is connected to the frame 11b via the connecting portion 11a2. When the bottom cover 12 includes the cover portion 12a and the mounting portion 12b, the bottom cover 12 is connected to the frame 11b via the mounting portion 12b.

[0281] In this case, the housing 10 has a simple structure, since the frame 11b is used as a base and the mounting member 11a and the bottom cover 12 are connected to both vertical ends of the frame 11b to form a cavity 10a for accommodating the battery 100.

[0282] In some embodiments, the support member 11a and the frame 11b are fixedly connected (e.g., detachably connected) or integrally formed. The support member 11a and the frame 11b are integrally formed by injection molding, die casting, forging, cold pressing, hot pressing, etc. The support member 11a and the frame 11b can be fixedly connected via fastening members 13, engagement with an engaging structure, welding, adhesive, hot melt connection, etc.

[0283] When the mounting member 11a and the frame 11b are integrally molded, the main body 11 is integrally molded, and the housing 10 can be assembled simply by connecting the main body 11 to the bottom cover 12, which facilitates assembly of the housing 10. When the mounting member 11a and the frame 11b are fixedly connected, the molding process of the mounting member 11a and the frame 11b is simple, and the process cost of the housing 10 can be reduced.

[0284] As can be seen, when the mounting member 11a has a mounting 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 an attachment portion 12b, it is connected to the frame 11b by the attachment portion 12b.

[0285] 18 and 23, in some embodiments, the height Hc of the battery cell 20 and the height Hp of the battery 100 in the vertical direction satisfy the relationship 0.02≦Hc / Hp≦0.98.

[0286] The height Hc of the battery cell 20 refers to the maximum vertical length of the battery cell 20 when the main body 11 and the bottom cover 12 are arranged vertically. Taking the battery cell 20 shown in FIGS. 18 and 19 as an example, when the first outer surface m1 of the battery cell 20 is installed facing away from the outer surface on which the electrode terminals 214 are located, the maximum length of the battery cell 20 refers to the distance between the electrode terminals 214 and the first outer surface m1. Naturally, when the first outer surface m1 of the battery cell 20 is adjacent to the outer surface on which the electrode terminals 214 are 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 installed opposite it.

[0287] The height Hp of the battery 100 refers to the maximum length of the battery 100 in the vertical direction z when the body 11 and the bottom cover 12 are arranged along the vertical direction z.

[0288] Specifically, the ratio of the height Hc of the battery cell 20 to the height Hp of the battery 100 may 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.

[0289] Table 5. Effect of the ratio of the height Hc of the battery cell 20 to the height Hp of the battery 100 on the safety of the battery 100 JPEG2025504528000006.jpg66130

[0290] Table 5 shows the effects of several ratios of the height Hc of the battery cell 20 to the height Hp of the battery 100 on the safety of the battery 100, based on tests conducted in accordance with GB38031-2020, "Safety Requirements for Power Storage Batteries for Electric Vehicles." As can be seen from Table 5, when Hc / Hp exceeds 0.98, the height of the battery 100 taken up by the structure of the housing 10 is too small, the strength of the housing 10 does not meet the requirements, and a safety hazard such as fire or explosion occurs. When Hc / Hp is 0.02 or less, the structural strength of the housing 10 meets the requirements, and no fire or explosion occurs. When Hc / Hp is less than 0.02, the structural strength of the housing 10 meets the requirements, but the space utilization rate of the battery 100 is low and the energy density is too low.

[0291] Furthermore, if 0.5≦Hc / Hp<0.94, not only does the strength requirement of the battery 100 meet, but safety hazards such as fire and explosion do not occur, and the space utilization rate of the battery 100 is increased, resulting in a high energy density of the battery 100.

[0292] 24 to 28, in some embodiments, the power consumption device includes a vehicle 1000, and the battery 100 is installed at the bottom of the vehicle body 200. The description of the vehicle 1000 refers to the description above, and a description thereof will be omitted here.

[0293] The body 200 of the vehicle 1000 refers to the area of ​​the vehicle 1000 where people and luggage are carried, including the driver's seat, passenger space, engine compartment, cargo space, etc. The body 200 generally includes the body shell and the doors, windows, trim, seats, air conditioning system, etc. attached to the body shell. The body shell generally refers to the structure formed by the main load-bearing members of the vehicle 1000, such as the longitudinal beams, cross beams, chassis, and struts, and the sheet metal members connected thereto. In the embodiments of the present application, the battery 100 being attached to the bottom of the body 200 mainly refers to the battery 100 being installed at the bottom of the body shell. In this case, the battery 100 being installed at the bottom of the body 200 does not occupy space inside the body 200, which helps reduce the volume and weight of the body 200.

[0294] In some embodiments, referring to FIG. 28, the main body 11 includes a mounting member 11a located on the upper part of the housing 10, the mounting member 11a is used to define the receiving cavity 10a, and the distance L between the mounting member 11a and the body 200 in the vertical direction satisfies L≧0.

[0295] Since the battery 100 is located at the bottom of the body 200 and the mounting member 11a is located at the top of the housing 10, the mounting member 11a of the battery 100 is closest to the body 200. The distance L between the mounting member 11a and the body 200 refers to the vertical distance between the top of the mounting member 11a and the body 200 located above it. When the mounting member 11a includes the mounting portion 11a1 and the connecting portion 11a2, the distance L between the mounting member 11a and the body 200 is the distance between the outer surface of the mounting portion 11a1 away from the accommodating cavity 10a and the body 200 located above it.

[0296] When the distance L between the mounting member 11a and the body 200 is equal to 0, the mounting member 11a is in close contact with the body 200, and when the distance L between the mounting member 11a and the body 200 is greater than 0, the mounting member 11a and the body 200 are separated and not in close contact. As can be seen, at this time, the bottom cover 12 is at the bottom of the mounting member 11a, and the distance g between the bottom cover 12 and the body 200 is greater than 0.

[0297] When the battery 100 is installed below the body 200, the range of the distance from the bottom of the battery 100 to the body 200 is the installation space occupied by the battery 100. When the mounting member 11a and the body 200 are separated, a certain amount of wasted space exists between the battery 100 and the body 200. When the mounting member 11a is brought into close contact with the body 200, the wasted space existing between the battery 100 and the body 200 can be incorporated into the spatial range of the battery 100. As a result, when the same space is occupied below the body 200, the volume of the battery 100 can be increased by bringing the battery 100 into close contact with the body 200, and the electrical quantity and energy density of the battery 100 can be increased.

[0298] At this time, the distance L between the mounting member 11a and the body 200 is equal to zero, the battery 100 can have a large amount of electricity and a high energy density, and the driving range of the vehicle 1000 is high. When the distance L between the mounting member 11a and the body 200 is greater than zero, the mounting of the mounting member 11a is flexible.

[0299] In some embodiments, referring to Figures 24 to 28, the main body 11 includes a mounting member 11a located on the top of the housing 10, the mounting member 11a is used to define the accommodating cavity 10a, and the battery 100 is attached to the body 200 via the mounting member 11a.

[0300] Since the battery 100 is located at the bottom of the body 200 and the mounting member 11a is located at the top of the housing 10, the mounting member 11a of the battery 100 is closest to the body 200, and the battery 100 is attached to the body 200 via the mounting member 11a; specifically, the mounting member 11a may be fixed to the body 200 via a fastening member 13 (screw, bolt, rivet, etc.), welding, or other methods.

[0301] When the battery cell 20 is placed on the mounting member 11a, the structure formed by the battery cell 20 and the mounting member 11a is connected to the body 200, which improves the upper strength of the battery 100 and improves the mounting strength of the battery 100.

[0302] In some embodiments, the mounting member 11 a is arranged to form at least a part of the chassis of the body 200 .

[0303] The chassis is part of the body 200 and includes a combination of four parts: the transmission system, the running system, the steering system, and the braking system. It is used to support and mount the engine of the vehicle 1000 and its various components and assemblies, forming the overall structure of the vehicle 1000, receiving power from the engine, and ensuring normal running.

[0304] The chassis is located at the bottom of the body 200, and the mounting member 11a is directly at least a part of the chassis. That is, the mounting member 11a is used to form at least a part of the chassis of the body 200. As a result, the mounting member 11a and the chassis of the body 200 are integrated into one body, and the space occupied by the gap between the conventional chassis and the battery 100 is incorporated into the battery 100 and used to increase the space of the battery 100, which helps to improve the energy of the battery 100 and improve the driving range of the vehicle 1000.

[0305] 24 to 28, according to some embodiments of the present application, a power consumption device includes a vehicle 1000, and a battery 100 is installed at the bottom of a body 200 of the vehicle 1000. The battery 100 includes a housing 10 and a battery cell 20, the housing 10 includes a mounting member 11a located at an upper portion thereof, the battery cell 20 is located within the housing 10 and suspended from the mounting member 11a, and the electrode terminal 214 of the battery cell 20 is located on an outer surface of the battery cell 20 away from the mounting member 11a, and the mounting member 11a forms at least a part of the chassis of the vehicle 1000.

[0306] In this case, the battery cells 20 are suspended from the mounting member 11a, which improves the strength of the mounting member 11a, thereby improving the strength of the upper part of the battery cells 20 and achieving certain requirements for bearing the force when the mounting member 11a is used as a chassis. At the same time, the electrode terminals 214 of the battery cells 20 are spaced apart from the mounting member 11a, allowing the battery cells 20 to be directly attached to the mounting member 11a, eliminating the gap between the battery cells 20 and the mounting member 11a. The eliminated gap can be used to increase the installation space for the battery cells 20, improving the energy of the battery 100 and improving the driving range of the vehicle 1000.

[0307] In some embodiments, there are multiple battery cells 20, and the multiple battery cells 20 are arranged and installed along the second direction y, which is perpendicular to the vertical direction Z. The mounting member 11a is connected to the ceiling wall 204 of the multiple battery cells 20, the ceiling wall 204 of the battery cells 20 is parallel to the second direction y, the vertical direction Z is perpendicular to the ceiling wall 204 of the battery cells 20, and the battery cells 20 are located below the mounting member 11a, so that the mounting member 11a is in direct surface contact with the battery cells 20 and the mounting member 11a is directly connected to the ceiling wall 201 of the battery cells 20, eliminating the need to leave an intermediate space, which improves the space utilization rate of the battery 100 and the energy density of the battery 100. At the same time, the battery cells 20 and the mounting member 11a are integrally connected, which improves the structural strength of the battery 100.

[0308] As can be seen from this, the ceiling wall 204 of the battery cell 20 is connected to the bottom surface of the mounting member 11a, and the bottom surface of the mounting member 11a may be a surface that is close to the battery cell 20 along the vertical direction, and the ceiling wall 204 of the battery cell 20 may be a surface that is close to the mounting member 11a along the vertical direction of the battery cell 20.

[0309] The relationship between the dimension N of the mounting member 11a in the vertical direction z and the weight M2 of the battery cell 20 satisfies 0.04 mm / kg≦N / M2≦100 mm / kg, and the dimension N of the mounting member 11a in the vertical direction Z is kept within a reasonable range. This not only prevents the internal space of the battery from being wasted due to N being too large, but also further strengthens the connection between the battery cell 20 and the mounting member 11a, strengthens the structural strength of the battery, and improves its performance.

[0310] The vertical dimension N of the mounting member 11a may be the vertical thickness of the mounting member 11a. The mounting member 11a may be a battery housing cover or may be part of a power consumption device such as a vehicle chassis. When the mounting member 11a is a vehicle chassis, the battery cells 20 are connected to the mounting member 11a, i.e., the battery cells 20 are connected to the vehicle chassis surface. The battery cells 20 are directly connected to the vehicle chassis surface, which eliminates the need for a battery housing cover, saving space that would otherwise be occupied by the battery housing cover, improving the space utilization rate of the battery, and increasing the energy density of the battery.

[0311] When N / M2>100 mm / kg, the dimension N along the vertical direction of the mounting member 11a is large, which gives the battery greater structural strength. However, at the same time, the mounting member 11a occupies a large space, which reduces the space utilization rate inside the battery and causes a decrease in the energy density of the battery.

[0312] If N / M2<0.04 mm / kg, the mounting member 11a will not be able to meet the structural strength requirements of the battery, and during use of the battery, the mounting member 11a will be deformed in the direction of gravity and may even break, causing the battery cells 20 to come off the mounting member 11a and resulting in safety accidents such as fires and explosions.

[0313] The test results for the different sizes of the mounting members and the different weights of the battery cells are shown in Table 6.

[0314] Table 6. Test results for different sizes of mounting members and battery cells with different weights JPEG2025504528000007.jpg54130

[0315] In some examples, the mounting member 11a may also be referred to as a hanging wall.

[0316] Alternatively, the ceiling wall 204 of the battery cell 20 may be the wall with the largest surface area of ​​the battery cell 20, thereby increasing the contact area between the mounting member 11a and the battery cell 20 and ensuring the strength of the connection between the mounting member 11a and the battery cell 20. In other embodiments, the mounting member 11a may be connected to a wall with a smaller surface area of ​​the battery cell 20, and the embodiments of the present application are not limited thereto.

[0317] In an alternative embodiment, the electrode terminal 214 is provided on the bottom wall 205 of the battery cell 20, and the bottom wall 205 and the top wall 204 are separated vertically and installed opposite each other, or the electrode terminal 214 is provided on a side wall of the battery cell 20, which is connected to the top wall 204 and is parallel to the vertical direction.

[0318] When the battery cell 20 is in use, the vertical direction may be parallel to the direction of gravity, and the electrode terminals 214 may face the ground in the direction of gravity. For example, the battery 100 includes a mounting member 11a and a housing 10, where the housing 10 is located below the mounting member 11a, the top wall 204 of the battery cell 20 faces the mounting member 11a and is connected to the mounting member 11a, 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., face the ground. In this way, the top wall 204 where the electrode terminals 214 are not installed may be directly connected to the mounting member 11a, and the battery cell 20 and the mounting member 11a are connected together, improving 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 mounting member 11a, improving the space utilization rate of the battery and increasing the energy density of the battery.

[0319] Optionally, the electrode terminals 214 may also be installed on one of two walls of the battery cells 20 that are arranged opposite each other along the second direction y, i.e., the side wall on which the electrode terminals 214 are installed is connected to the ceiling wall 204 and is parallel to the vertical direction. For example, the electrode terminals 214 of the battery cells 20 in the same row arranged along the second direction are also arranged along the second direction.

[0320] Optionally, the vertical dimension N of the mounting member 11a is 0.2 mm to 20 mm. Optionally, the weight M2 of the battery cell 20 is 1 kg to 10 kg. This allows for flexible selection of the vertical dimension of the mounting member 11a according to the weight M2 of the battery cell 20, or allows for selection of an appropriate corresponding battery cell 20 according to the vertical dimension of the mounting member 11a.

[0321] Optionally, the mounting member 11a may have a plate-like structure such as a flat plate, as shown in Fig. 20. In the plate-like structure, it is only necessary to realize a flat surface of the mounting member 11a that comes into contact with the ceiling wall 204 of the battery cell 20, and other aspects are not specifically limited.

[0322] Optionally, as shown in FIG. 31, a cavity 11t is provided inside the mounting member 11a. On the one hand, the cavity 11t provides an expansion space for the battery cell 20, and on the other hand, the cavity 11t can also serve as a flow path to accommodate a fluid, thereby regulating the temperature of the battery cell 20.

[0323] For example, the cavity 11t is used to accommodate a heat exchange medium to adjust the temperature of the battery cell 20, and in this case, the mounting member 11a can also be referred to as a thermal management member. Of course, in other examples, a heat exchange member may be installed between the battery cell 20 and the mounting member 11a, and the heat exchange member may be a member having passages and be considered as a thermal management member, or the heat exchange member may be any other member capable of adjusting the temperature of the battery cell 20, and the present application is not limited thereto.

[0324] Optionally, a reinforcing plate 11s may be installed in the cavity 11t, and the reinforcing plate 11s may extend along the first direction. On the one hand, the reinforcing plate 11s may enhance the structural strength of the mounting member 11a, and on the other hand, the reinforcing plate 11s may form a plurality of flow channels for accommodating a heat exchange medium inside the mounting member 11a, and the plurality of flow channels may be connected to each other or may be independent from each other.

[0325] The heat exchange medium may be a liquid or a gas, and adjusting the temperature refers to heating or cooling the plurality of battery cells 20. When cooling the battery cells 20, the cavity 11t may accommodate a cooling medium for adjusting the temperature of the plurality of battery cells 20. In this case, the heat exchange medium may be referred to as a cooling medium or a cooling fluid, more specifically, as a cooling liquid or a cooling gas. The heat exchange medium may also be used for heating, and the present embodiment is not limited thereto. Optionally, the heat exchange medium may be circulated to achieve a better temperature adjustment effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, a refrigerant, air, or the like.

[0326] 32, a reinforcing portion 506 is provided on the support member 11a. The support member 11a may include a first surface 504 and a second surface 505, the second surface 505 being connected to the top wall 204 of the battery cell 20, and the reinforcing portion 506 is provided on the first surface 504 and / or the second surface 505, which can enhance the structural strength of the support member 11a. Optionally, the reinforcing portion 506 may be a protrusion and / or a groove press-formed on the support member 11a, although the embodiment of the present application is not limited thereto.

[0327] Optionally, as shown in Fig. 33, a reinforcing rib 503 is provided on the surface of the mounting member 11a that is away from the battery cells 20 in the vertical direction. In the example of Fig. 33, the surface of the mounting member 11a that is away from the battery cells 20 in the vertical direction may be the first surface 504, and the reinforcing rib 503 is provided above the first surface 504. The reinforcing rib 503 can enhance the structural strength of the mounting member 11a.

[0328] The vertical dimension of the reinforcing rib 503 is N3. When (N+N3) / N>2, the relationship between N and the weight M2 of the battery cell 20 satisfies 0.04 mm / kg≦N / M2≦100 mm / kg. The reinforcing rib 503 may belong to a battery or to a power consumption device such as a vehicle, and may be installed according to the requirements for the structural strength of the vehicle. 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 not taken into consideration. From another perspective, when the dimension N3 of the reinforcing rib 503 is small, for example, (N+N3) / N≦2, the relationship between (N+N3) and M2 satisfies 0.04 mm / kg≦(N+N3) / M2≦100 mm / kg.

[0329] The number and shape of the reinforcing ribs 503 can be specifically set according to the requirements of the power consumption device or the installation manner of the battery, and the embodiments of the present application are not specifically limited thereto.

[0330] Alternatively, the reinforcing rib 503 and the mounting member 11a may be integrally molded, which facilitates processing and contributes to process savings. In other embodiments, the reinforcing rib 503 may be molded separately from the mounting member 11a, and then connected or assembled by bonding, welding, adhesive, machining, pressing, etc., and the embodiments of the present application are not specifically limited thereto.

[0331] Alternatively, the mounting member 11a may have a single-layer plate structure or a multi-layer plate structure, which has higher rigidity and strength than the single-layer plate structure.

[0332] Optionally, as shown in FIG. 34 , the mounting member 11a includes a first plate 51 and a second plate 52, where the second plate 52 is connected to the ceiling wall 204 of the battery cell 20, and the first plate 51 is installed facing the second plate 52 in the vertical direction. The second plate 52 may be a flat plate, and the first plate 51 does not have to be a flat plate. The specific configuration of the first plate 51, for example, its size and strength, can be adjusted according to the specific requirements of the power consumption device, and the embodiment of the present application is not limited thereto. The mounting member 11a may further include a third plate, a fourth plate, etc., and the embodiment of the present application does not limit the number of plates included in the mounting member 11a.

[0333] 34, the dimension N of the mounting member 11a may be the dimension along the vertical direction of the second plate 52, and the dimension along the vertical direction of the first plate 51 is N4. When (N+N4) / N>2, the relationship between N and M2 satisfies 0.04mm / kg≦N / M2≦100mm / kg when only considering the relationship between N and M2. When (N+N4) / N≦2, the relationship between (N+N4) and M2 satisfies 0.04mm / kg≦(N+N4) / M2≦100mm / kg.

[0334] In some embodiments, the relationship between the vertical dimension N of the mounting member 11a and the weight M2 of the battery cell 20 further satisfies 0.1 mm / kg≦N / M2≦20 mm / kg, which prevents the battery from catching fire or exploding, and can better ensure the safety of the battery 100 while meeting the energy density requirements.

[0335] In some embodiments, as shown in FIG. 35 , the battery 100 further includes a reinforcing element 30, in which the plurality of battery cells 20 are arranged in sequence along the second direction y, the reinforcing element 30 extends along the second direction y and is connected to the first wall 201 of each battery cell 20 in the plurality of battery cells 20, and the first walls 201 are two walls of the battery cell 20 facing each other along the first direction x, i.e., the two first walls 201 are installed opposite each other along the first direction x, the first direction x is perpendicular to the first walls 201, and the first wall 201 is installed as a top wall of the battery cell 20 adjacent to the bottom wall of the battery cell 20.

[0336] The reinforcing element 30 is connected to the first wall 201 of each battery cell 20, so that the reinforcing element 30 is integrally connected to the battery cell 20, thereby improving the structural strength of the battery. In this case, there is no need to install side panels inside the battery, and there is no need to install additional structures such as beams, so the space utilization rate inside the battery can be greatly improved, and the structural strength and energy density of the battery can be improved.

[0337] Of course, the reinforcing element 30 can also be called a partition plate.

[0338] Alternatively, the first wall 201 may be a wall of the battery cell 20 with the largest surface area, thereby enhancing the connection strength between the reinforcing element 30 and the battery cell 20. In other embodiments, the first wall 201 may be a wall of the battery cell 20 with a small surface area, and the embodiments of the present application are not limited to the details.

[0339] Optionally, the battery cell 20 may further include two side walls arranged opposite each other along the second direction y, and the side walls are adjacent to the top wall of the battery cell, the bottom wall of the battery cell, and the first wall 201, and the side walls of two adjacent battery cells 20 arranged along the second direction y face each other.

[0340] Optionally, the dimension of the reinforcing element 30 in the first direction x is 0.1 mm to 100 mm. This allows both the strength of the reinforcing element 30 and the energy density of the battery 100 to be achieved.

[0341] If the dimension of the reinforcing element 30 in the first direction x is too small, the rigidity of the reinforcing element 30 will be poor and the structural strength of the battery 100 will not be effectively improved. If the dimension of the reinforcing element 30 in the first direction x is too large, it will occupy too much space inside the battery 100, which is detrimental to improving the energy density of the battery 100. Therefore, by setting the dimension of the reinforcing element 30 in the first direction x to 0.1 mm to 100 mm, the energy density of the battery 100 can be effectively improved and the structural strength of the battery 100 can be improved.

[0342] Optionally, as shown in FIG. 47 , a cavity 30a may be provided inside the reinforcing element 30. The cavity 30a can provide an expansion space for the battery cell 20 and can also serve as a flow path to accommodate a fluid (liquid or gas), thereby regulating the temperature of the battery cell 20. This can also ensure the strength of the reinforcing element 30 while reducing its weight. In this case, the reinforcing element 30 can also be referred to as a thermal management member. Optionally, a structural reinforcing element may be provided inside the cavity structure to improve the strength of the reinforcing element 30 and form multiple flow paths.

[0343] Regulating the temperature of the battery cells 20 refers to heating or cooling the multiple battery cells 20 .

[0344] Alternatively, the reinforcing element 30 may be a metal partition plate, in which case an insulating layer is provided on the surface of the reinforcing element 30, which may be an insulating film or insulating paint.

[0345] Optionally, the reinforcing element 30 is a non-metallic partition plate, i.e., the reinforcing element 30 is a non-metallic insulating plate.

[0346] Optionally, the battery 100 includes multiple rows of the battery cells 20 and multiple reinforcing elements 30 arranged along the second direction y, and the multiple rows of the battery cells 20 and multiple reinforcing elements 30 are alternately arranged in the first direction x. In this manner, the multiple rows of the battery cells 20 and the multiple reinforcing elements 30 are interconnected and integrated into a single unit and housed within a housing, thereby further ensuring the overall structural strength of the battery 100 and improving the performance of the battery.

[0347] The multiple rows of battery cells 20 and the multiple reinforcing elements 30 are alternately arranged in the first direction x. Along the first direction, the battery cells 20 and the reinforcing elements 30 can be arranged in the order of battery cell-reinforcing element-battery cell or reinforcing element-battery cell-reinforcing element.

[0348] 36 and 37, the battery 100 may be composed of a plurality of battery modules 100a. The battery module 100a includes at least one row of battery cells 20 and at least one reinforcing element 30 arranged along the second direction y, and the at least one row of battery cells 20 and the at least one reinforcing element 30 are alternately arranged in the first direction x.

[0349] 37, the battery module 100a includes N rows of battery cells 20 and N-1 reinforcing elements 30, and the reinforcing elements 30 are disposed between two adjacent rows of battery cells 20, where N is an integer equal to or greater than 1, and in FIG. 37, N is 2. In this way, the number of reinforcing elements 30 can be reduced and the energy density of the battery 100 can be improved.

[0350] For example, as shown in FIG. 38, along the first direction x, the number of reinforcing elements 30 is one less than the number of rows of battery cells 20; as shown in FIG. 39, the number of reinforcing elements 30 is equal to the number of rows of battery cells 20; and as shown in FIG. 40, along the first direction x, the number of reinforcing elements 30 is one more than the number of rows of battery cells 20.

[0351] Optionally, the battery module 100a includes N rows of battery cells 20 and N+1 reinforcing elements 30, and the reinforcing elements 30 are arranged between two adjacent rows of battery cells 20, where N is an integer greater than or equal to 1. Optionally, the battery 100 can be formed by combining battery modules 100a having different arrangements of the battery cells 20 and the reinforcing elements 30 with each other.

[0352] Optionally, the plurality of battery modules 100a may be arranged along the first direction with gaps between adjacent battery modules 100a to provide expansion space for the battery cells 20.

[0353] 37 , a fixing structure 103 may be provided at an end of the reinforcing element 30 in the second direction y, and the reinforcing element 3a may be fixed to the mounting member 11a via the fixing structure 103. The fixing structure 103 may be directly connected to the mounting member 11a, or may be connected to a side wall of the housing 10 and thereby connected to the mounting member 11a. In this way, each battery cell 20 is fixed to the mounting member 11a by the reinforcing element 30 and the fixing structure 103, which strengthens the fixed connection between the battery cell 20 and the mounting member 11a, connects the entire battery 100 together, and improves the structural strength of the battery 100.

[0354] Optionally, the fixing structure 103 may include a fixing plate 104. The fixing plate 104 is fixedly connected to an end of the reinforcing element 30 and is fixedly connected to the battery cell 20 located at the end of the reinforcing element 30. For example, in a rectangular parallelepiped battery cell 20, the fixing plate 104 may be connected perpendicularly to the reinforcing element 30, and two adjacent side walls of the rectangular parallelepiped battery cell 20 may be respectively connected to the reinforcing element 30, thereby further reinforcing the fixing effect on the battery cell 20.

[0355] Optionally, the fixing plate 104 may be made of the same material as the reinforcing element 30, such as metal, plastic, or a composite material. The thickness of the fixing plate 104 may be the same as the reinforcing element 3a. The material or thickness of the fixing plate 104 may be different from that of the reinforcing element 30. For example, the fixing plate 104 may be made of a stronger material or have a thicker setting, although embodiments of the present application are not limited thereto.

[0356] Alternatively, the connection between the reinforcing element 30 and the fixing plate 104 may be resistance welding, resistance riveting, SPR riveting, lock bolts, fastening, etc. The fixing plate 104 may be fixed to the mounting member 11a by resistance welding, resistance riveting, SPR riveting, lock bolts, fastening, etc., but the embodiments of the present application are not limited thereto.

[0357] Alternatively, the fixing plate 104 and the battery cell 20 may be fixedly connected by adhesive, for example, by a structural adhesive, but the embodiment of the present application is not limited thereto.

[0358] Optionally, the fixing plate 104 includes a first connecting portion 105 extending in a direction away from the battery cell 20 along the first direction, and the first connecting portion 105 is used to connect to the mounting member 11a. For example, taking the second surface 505 to which the mounting member 11a is connected as an example, the first connecting portion 105 may be formed at a position close to the second surface 505 of the fixing plate 104 in a direction away from the battery cell 20, i.e., extending outward, and connects to the second surface 505 via the first connecting portion 105.

[0359] The first connection portion 105 may be parallel to the second surface 505 of the mounting member 11a, and the area of ​​the first connection portion 105 may be determined according to the fixing method with the side wall of the housing 10 to be connected, so as to meet the required fixing effect requirements.

[0360] Alternatively, the first connection portion 105 may be formed by bending the fixing plate 104. For example, the first connection portion 105 may be formed by bending an edge of the fixing plate 104 that is close to the second surface 505 in a direction away from the battery cell 20. For example, the first connection portion 105 may be formed by bending an upper edge of the fixing plate 104 outward. This allows the first connection portion 105 and the main body of the fixing plate 104 to have an integrated structure, thereby improving connection performance.

[0361] 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, and the second connecting portion 107 is used to connect the fixing plate 104 and the reinforcing element 30. For example, at the position where the fixing plate 104 and the reinforcing element 30 are connected, the second connecting portion 107 may be formed extending in a direction away from the battery cell 20, i.e., outward, and the fixing plate 104 is fixedly connected to the reinforcing element 30 via the second connecting portion 107.

[0362] Optionally, in addition to connecting the reinforcing element 30, the second connection portion 107 can also simultaneously realize the connection between the fixing plates 104. For example, one fixing plate 104 is installed for each row of battery cells 20, and the reinforcing element 30 and the two fixing plates 104 corresponding to the two rows of battery cells 20 are fixed via the second connection portion 107.

[0363] The second connecting portion 107 may be parallel to the reinforcing element 30. The area of ​​the second connecting portion 107 may be determined according to the fixing method to meet the requirements of the fixing effect.

[0364] Optionally, the reinforcing element 30 is connected to the first wall 201. The fixed connection between the reinforcing element 30 and the first wall 201 is realized by bonding, which has a simple structure and is easy to process and assemble.

[0365] Optionally, the reinforcing element 30 may be sandwiched between the battery cells 20 of adjacent rows by abutting against the first wall 201 .

[0366] 11, 16, 26, 41, 43, and 44, the battery cells 20 are inverted within the housing 10 with the end covers 212 facing the bottom wall 102, thereby enhancing the rigidity of the entire battery and reducing the probability of breakage in a collision. The end covers 212 are provided with pressure reducing mechanisms 213 and electrode terminals 214, which are both facing the bottom wall 102, improving the safety of the battery.

[0367] For example, the battery cell 20 is inverted in the housing 10 with the end cover 212 facing the bottom wall 102, which means that the battery cell 20 is installed inverted relative to the housing 10 in the vertical direction.

[0368] By installing the battery cells 20 inverted in the casing 10 in this manner, the battery cells 20 can be installed on top of the battery 100, increasing the rigidity of the top of the battery 100 and improving the safety of the battery 100. Furthermore, the end covers 212 of the battery cells 20 are oriented toward the bottom of the battery 100, increasing the energy density of the battery 100 and improving the usability of the battery 100. The electrode terminals 214 are oriented toward the bottom wall 102, providing a large space for electrical connection to the electrode terminals 214. The pressure reduction mechanism 213 is oriented toward the bottom of the battery 100, preventing the pressure reduction mechanism 213 from discharging toward other external devices connected to the top of the battery 100 and improving the safety of the battery 100.

[0369] Optionally, the electrode terminals 214 are located on both sides of the pressure reducing mechanism 213, and it is understood that the pressure reducing mechanism 213 may have other positional relationships with the electrode terminals 214.

[0370] In some embodiments of the present application, as shown in Figures 11, 27, and 41, the housing 10 includes a mounting member 11a and a frame 11b, the mounting member 11a is installed on the top of the housing 10, and the battery cells 20 are fixedly connected to the mounting member 11a.

[0371] The mounting member 11a is installed on the top of the housing 10 and is arranged in order from top to bottom with the frame 11b in the vertical direction Z. The mounting member 11a is a plate extending in the horizontal direction and is used to increase the rigidity of the upper part of the battery 100. The frame 11b is a plate extending in the vertical direction Z and is installed to surround the mounting member 11a. An opening 10c is formed in the bottom of the housing, providing a space for accommodating the battery cells 20 inside the housing 10. The battery cells 20 are fixedly connected to the mounting member 11a, which can increase the rigidity of the upper part of the battery 100 and reduce the possibility of the battery 100 being damaged in a collision.

[0372] Alternatively, the battery cells 20 may be directly connected to the mounting member 11a by adhesive bonding, or may be fixedly connected by other methods.

[0373] Alternatively, the frame 11b may be integrally formed with the mounting member 11a, or may be fixedly connected to the mounting member 11a by a connection method such as welding, adhesive, fasteners, or a flow drill screw process, and the embodiments of the present application are not limited thereto.

[0374] For example, the electrode terminals 214 of the battery cells 20 are installed facing the openings 10c in the bottom wall 102, and the end faces of the battery cells 20 facing the electrode terminals 214 are fixed to the mounting member 11a. In actual application, the battery 100 is fixed to an external device, such as the interior of a vehicle 1000, via the top of the housing 10. The battery cells 20 installed on top of the battery 100 can increase the rigidity of the top of the battery 100, reducing the possibility of the battery 100 being damaged in a collision and improving the safety of the battery 100. Furthermore, because the electrode terminals 214 of the battery cells 20 face the openings 10c and the face of the battery cells 20 facing the electrode terminals 214 is fixedly connected to the top of the housing 10, the battery 100 leaves less space to accommodate the battery cells 20, increasing the energy density of the battery 100 and allowing the battery cells 20 to be better integrated into the housing 10.

[0375] In an optional embodiment, cooling passages are embedded inside the mounting member 11a. Because the battery cells 20 are mounted on the mounting member 11a, the tops of the battery cells 20 are in contact with the mounting member 11a. Taking the performance of the battery 100 into consideration, the mounting member 11a has passages embedded therein through which gas or liquid as a heat exchange medium can flow to regulate the temperature of the battery 100 when the battery 100 is operating, thereby improving the service life and usability of the battery 100.

[0376] In another alternative embodiment, the passage may be installed between the battery cell 20 and the mounting member 11a as a thermal management member, or may be formed in any other member installed to perform the function of regulating the temperature of the battery 100, and the embodiments of the present application are not limited thereto.

[0377] In some embodiments of the present application, as shown in Figures 11, 27 and 41, the housing 10 further includes a bottom cover 12 installed in the opening 10c, and the frame 11b are connected to each other to form a frame structure, and the bottom cover 12 is fixedly connected to the frame 11b.

[0378] The frames 11b are connected to each other to form a frame structure, i.e., the frames 11b are arranged around the circumferential direction of the mounting member 11a and combined with the mounting member 11a to form the housing 10, which houses the battery cells 20. The bottom cover 12 is fixedly connected to the frames 11b and covers the opening 10c, so that the housing 10 has a relatively sealed structure.

[0379] The bottom cover 12 includes a cover portion 12a and a mounting portion 12b. The mounting portion 12b is circumferentially disposed around the cover portion 12a and engages with 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, so that the bottom cover 12 is fixedly connected to the frame 11b. Alternatively, the mounting portion 12b may be bolted to the frame 11b, or the mounting portion 12b may be fixedly connected to the frame 11b in other ways.

[0380] In the vertical direction Z, the cover portion 12a protrudes from the bottom portion 102 relative to the mounting portion 12b. This results in a larger distance between the battery cells 20 installed inside the housing 10 and the bottom cover 12. Note that the distance by which the cover portion 12a protrudes relative to the mounting portion 12b should be selected based on the energy density of the battery 100, and should not be so large as to increase the volume of the battery 100 and reduce the energy density of the battery 100.

[0381] Naturally, the cover portion 12a may also be referred to as a main body portion, and the attachment portion 12b may also be referred to as a fitting portion.

[0382] In some embodiments, as shown in Figures 41 and 42, the battery 100 further includes a protective assembly 40, which is installed between the battery cells 20 and the bottom wall 102, thereby supporting the battery cells 20. The battery cells 20, the protective assembly 40, and the bottom wall 102 are arranged in order from top to bottom along the vertical direction Z, and the protective assembly 40 may abut directly or indirectly against the battery cells 20, thereby performing the functions of supporting and mounting the battery 100, increasing the structural strength of the battery 100, improving the load-bearing performance of the battery 100, and reducing the possibility of the battery 100 being damaged in a collision.

[0383] Of course, in some instances, the protection assembly 40 may be referred to as a mounting assembly.

[0384] For example, the battery cells 20 are fixedly connected to the mounting member 11a, and the protection assembly 40 is fixedly connected to the battery cells 20, which can provide multiple fixing functions to the structure of the battery 100 and improve the stability of the battery 100.

[0385] 41, the battery cell 20 is placed inverted in the housing 10 with the end cover 212 facing the bottom wall 102, and at this time the protection assembly 40 directly or indirectly abuts against the end cover 212 of the battery cell 20. Abutment means that the two members are in direct contact with each other or indirectly engaged with each other via another member, but are not fixed to each other.

[0386] For example, the end cover 212 is provided with a pressure reducing mechanism 213 and electrode terminals 214, both of which are facing the bottom wall 102, and the protection assembly 40 supports the battery cells 20 and protects the pressure reducing mechanism 213 and electrode terminals 214.

[0387] In some embodiments, as shown in Figures 11 and 41, the housing 10 includes a main body 11 and a bottom cover 12 installed on the bottom of the main body 11, the bottom cover 12 is hermetically connected to the main body 11 and together forms a sealed accommodating cavity 10a, the wall of the bottom cover 12 facing the battery cell 20 forms the bottom wall 102 of the accommodating cavity 10a, and the protection assembly 40 is installed between the battery cell 20 and the bottom cover.

[0388] In some embodiments, as shown in FIGS. 11 and 41 , the battery cell 20 is inverted in the housing 10 with the end cover 212 facing the bottom wall 102, the pressure reducing mechanism 213 and the electrode terminal 214 are installed on the end cover 212, the wall of the bottom cover 12 facing the battery cell 20 forms the bottom wall 102 of the accommodating cavity, and the protection assembly 40 is installed between the battery cell 20 and the bottom cover 12, i.e., between the pressure reducing mechanism 213 and the electrode terminal 214 and the bottom cover 12, and is arranged to support the battery cell 20 and the bottom cover 12, thereby providing protection for the pressure reducing mechanism 213 and the electrode terminal 214 and performing a protective function against them during a collision.

[0389] In some embodiments, as shown in FIG. 41 , the battery 100 further includes a bus member 24, which is used to electrically connect the electrode terminals of at least two battery cells 20, and the protection assembly 40 is installed between the bottom wall 102 and the bus member 24, and at the same time, the protection assembly 40 is used to insulate the battery cells 20 from the bottom wall 102.

[0390] As a result, the protection assembly 40 is installed between the bottom wall 102 and the bus members 24 and is used to support the battery cells 20. That is, the upper and lower sides of the protection assembly 40 can abut against a portion of the battery cell 20 that is not covered by the bus members 24 and the bottom wall 102 of the receiving cavity 10a, respectively, providing support for the battery cells 20 in the vertical direction Z. At the same time, the protection assembly 40 ensures that there is a gap between the battery cells 20 and the bottom wall 102 of the receiving cavity 10a to prevent them from contacting each other, and similarly maintains a certain distance between the bus members connected to the battery cells 20 and the bottom wall 102 of the receiving cavity 10a. This ensures that both the bus members and the battery cells 20 are installed insulated from the bottom wall 102 of the receiving cavity 10a, preventing the exposed bottom wall 102 from being affected by the external environment and causing electrical interference to the battery cells 20 and the bus members 24.

[0391] Furthermore, the protective assembly 40 may have a smooth surface extending perpendicular to the vertical direction Z, providing an additional layer of protection to the bottom of the housing 10 and further reducing the impact on the battery cells 20 and bus members 24 when the bottom wall 102 of the accommodating cavity 10a is impacted.

[0392] In some examples, as shown in FIG. 41 , the battery cells 20 are inverted within the housing 10 with the end covers 212 facing the bottom wall 102, and electrode terminals 214 are installed on the end covers 212 and electrically connected to the corresponding bus members 24. The flat bottom surface of the battery cell 20 opposite to the top surface on which the electrode terminals 214 are installed is connected to the top of the housing 10, and the electrode terminals 214 are located on one side away from the top of the housing 10, which effectively improves the structural strength of the top of the battery 100. Furthermore, connecting the bottom of the battery cell 20 to the top of the housing 10 improves the utilization of the space within the housing 10 and increases the energy density of the entire battery.

[0393] The bus member 24 in the embodiment of the present application may be a CCS (Cells Contact System) assembly, i.e., an integrated wiring harness composed of flexible circuit boards, plastic structural members, bus bars, etc., which is used to form the necessary electrical connections between multiple battery cells 20, and the battery cells 20 can be charged and discharged through the bus member. Optionally, the bus member in the embodiment of the present application may be welded to the electrode terminals of the battery cells 20, thereby fixing the connection between the bus member and the battery cells 20.

[0394] Alternatively, the bus member 24 may include a plurality of assemblies, each of which is connected to and installed in correspondence with a battery module made up of the battery cells 20, and these assemblies are further electrically connected to form the required series connection / parallel connection / series-parallel connection relationship, or the bus member 24 may be installed as a single unit and connected to each battery cell 20 via the same assembly.

[0395] Alternatively, the housing 10 may include a mounting member 11a, a frame 11b, and a bottom cover 12, and the extension distance of the frame 11b in the vertical direction Z may be greater than the extension distance of the battery cells 20, the bus members, and the protection assembly 40 in the vertical direction Z, in which case the bottom cover 12 may be placed over the lower end of the frame 11b.

[0396] In some embodiments, as shown in FIG. 42, the protective assembly 40 includes a protective strip 41 that abuts the battery cell 20.

[0397] In some examples, the protective assembly 40 may be a mounting assembly and the protective strip 41 may also be referred to as a protective member or a mounting strip, eg, the protective assembly 40 includes a protective member and the mounting assembly includes a mounting strip.

[0398] Optionally, the protective assembly 40 may include multiple protective strips 41, each of which abuts against multiple battery cells 20, maintaining a certain distance between the battery cells 20 and the bottom wall 102, and reducing the impact on the battery when the bottom wall 102 is impacted.

[0399] Alternatively, the protective strip 41 may abut against the surface on which the electrode terminals 214 of the battery cells 20 are installed. Specifically, the protective strip 41 may abut against a part of the surface on which the electrode terminals of the battery cells 20 are installed that can receive force, other than the area where the electrode terminals are located. For example, the protective strip 41 abuts against "shoulders" on the surface located on both sides of the electrode terminals in the second direction Y. Based on this, the protective strips 41 need to be installed at corresponding positions on the battery cells 20. When there are multiple battery cells 20 and the multiple battery cells 20 are arranged in an array, there will also be multiple protective strips 41, and the multiple protective strips 41 will be installed at intervals along the second direction, each protective strip 41 extending along the first direction to form a strip-like structure in which the multiple protective strips 41 are installed in parallel at intervals. In addition to the protective strips 41 located at the edges, other protective strips 41 may be installed at positions where adjacent battery cells 20 contact each other, i.e., each protective strip 41 can simultaneously abut two battery cells 20 that are adjacently installed in the second direction Y.

[0400] Optionally, the first direction X is perpendicular to the second direction Y, and the first and second directions are perpendicular to the vertical direction, respectively, to form a regular, easily processable structure.

[0401] In some alternative embodiments, as shown in FIGS. 43 and 44 , the orthogonal projection of the electrode terminal 214 on the bottom wall 102 is located between the orthogonal projections of the adjacent protective strips 41 on the bottom wall 102, and the protective strips 41 abut against the battery cells 20. At this time, the protective strips 41 abut against the shoulder portions of the battery cells 20, and the connection between the electrode terminal and the bus members 24 is not obstructed by the protective assembly 40. Furthermore, after the battery cells 20 are mounted on the protective assembly 40, the electrode terminal can be dropped between the adjacent protective strips 41, so that the force generated by the impact can be distributed among multiple battery cells 20, preventing the electrode terminal from being damaged by the impact.

[0402] In some embodiments, the protective strip 41 is fixedly connected to the battery cells 20 and / or the housing 10, i.e., the protective strip 41 is fixedly connected to at least one of the battery cells 20 and the housing 10 to ensure that the protective strip 41 is securely installed.

[0403] 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, the wall of the bottom cover 12 facing the battery cell 20 forms the bottom wall 102 of the accommodating cavity 10a, and the protective strip 41 is fixedly connected to the bottom cover 12.

[0404] Optionally, the protective strip 41 is adhered to the battery cells 20 and / or the housing 10, i.e., the protective strip 41 is adhered to at least one of the battery cells 20 and the housing 10 for easy assembly.

[0405] For example, when the protective strip 41 is adhered to the housing 10, the protective strip 41 is adhered to the bottom wall 102. The housing 10 includes a bottom cover 12, the wall of the bottom cover 12 facing the battery cell 20 forms the bottom wall 102 of the accommodating cavity 10a, and the protective strip 41 is adhered to the bottom cover 12.

[0406] In an alternative embodiment, the multiple protective strips 41 include an edge protective strip 411, a first protective strip 412, and a second protective strip 413, and along the second direction y, the edge protective strip 411 is installed at the edge of the assembly consisting of the arrayed battery cells 20, and the first protective strip 412 and the second protective strip 413 are alternately arranged between the two edge protective strips 411.

[0407] The protective strip 41 in this embodiment may include three types of protective members installed at different positions. The edge protective strips 411 are installed at the edge positions of the battery cells 20, and the first protective strips 412 and the second protective strips 413 are installed alternately between the edge protective strips 411. The first protective strips 412 and the second protective strips 413 may have different dimensions to accommodate various connecting members in the bus members and provide the necessary space for connecting adjacent battery cells 20.

[0408] Optionally, the protective strips 41 in the embodiments of the present application may have a number of different sizes, and the size of each protective strip 41 may be adjusted accordingly based on the length of the battery cells 20 and the positions of the electrode terminals 214 and pressure reducing mechanisms thereon. When each protective strip 41 abuts against a number of battery cells 20, it may abut between two adjacent battery cells 20. In this case, the distance between the first protective strip 412 and the second protective strip 413 may be close to the length of the battery cells 20 themselves. The alternating arrangement of the first protective strips 412 and the second protective strips 413 can be adapted to the installation of the bus members 24, forming a safe and reliable electrical connection circuit.

[0409] In some embodiments, the extension length of the first protective strip 412 is greater than the extension length of the second protective strip 413 along the first direction X.

[0410] As described above, the first protective strip 412 and the second protective strip 413 in the embodiments of the present application may have different lengths in their extension directions, and the notches between adjacent second protective strips 413 may be used to install rigid connecting members such as bus bars that form electrical connections between the battery cells 20, and two adjacent battery cells 20 are electrically connected in the second direction y through the connecting members. That is, the rigid connecting members in the bus members 24 can be released by adjusting the length of the second protective strips 413 and the spacing between adjacent second protective strips 413 in the second direction y.

[0411] Alternatively, depending on the installation positions of the connecting members between the battery cells 20, the length of the first protective strip 412 extending along the first direction X may be the same as the length of the cavity of the housing 10 in that direction, i.e., it may extend integrally and completely inside the housing 10, or the first protective strip 412 may have blocking openings in the first direction X, so that corresponding connecting members are installed at the locations of the blocking openings. By installing the connecting members of the bus members 24 at the locations of the blocking openings of the protective strip 41, the connecting members can also maintain a certain distance from the bottom wall 102, thereby providing impact protection and maintaining insulation.

[0412] In some alternative embodiments, the width of the first protective strip 412 and the second protective strip 413 along the second direction Y is greater than the width of the edge protective strip 411. The edge protective strip 411 is installed at the edge of the array of battery cells 20, and does not need to simultaneously support two adjacent rows of battery cells 20 in the second direction Y like the first protective strip 412 or the second protective strip 413, 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, and still achieves a good supporting effect.

[0413] 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 strips 41 may protect the edge protective strip 411 installed at the edge and the first protective strips 412 and second protective strips 413 installed alternately between the edge protective strips 411. The edge protective strip 411 only abuts one row of battery cells 20, and therefore its width may be smaller than the first protective strips 412 and second protective strips 413. The first protective strips 412 and second protective strips 413 may be installed at the connection points of two adjacent rows of battery cells 20 and simultaneously abut multiple battery cells 20. Each first protective strip 412 abuts two adjacent battery cells 20 simultaneously, reducing the number of protective strips 41 required and improving production efficiency.

[0414] Alternatively, in the battery provided by the embodiments of the present application, the width and position of each protective strip 41 in the protective assembly 40 may be designed based on the position and size of the area of ​​the battery cell 20 where the protective assembly 40 will overlap. Specifically, the width of the protective strip 41 can be selected based on the amount of pressure that the battery cell 20 can withstand and the magnitude of the impact that is expected to occur, and the installation position of the protective strip 41 can be selected based on the positions of the electrode terminal 214 and the pressure reducing mechanism.

[0415] In an alternative embodiment, the extension length of the protection assembly 40 in the vertical direction Z is greater than 1.5 mm.

[0416] In the embodiments of the present application, the protective assembly 40 must extend a certain dimension in the vertical direction Z, i.e., each protective strip 41 must have a certain thickness. Since the protective assembly 40 provides protection for the battery cells 20 against impacts from below, the relationship between the thickness of the protective assembly 40 itself and the impact energy has a significant impact on whether or not safety issues such as battery fire or explosion will occur. Based on this, the protective assembly 40 must have a certain basic thickness to provide corresponding protective strength. For example, the overall thickness of the protective assembly 40 in the embodiments of the present application may be greater than 1.5 mm.

[0417] 41 to 44, in some embodiments, the pressure reducing mechanism 213 of the battery cell 20 is also installed facing the bottom wall of the accommodating cavity. The protective assembly 40 includes a plurality of protective strips 41 spaced apart along the length of the casing 10, and a plurality of battery cells 20 are installed, with the pressure reducing mechanism 213 and electrode terminal 214 of each battery cell 20 located between two adjacent protective strips 41. For example, the protective strips 41 may be provided at the connection points of adjacent battery cells 20, thereby preventing contact with the electrode terminals 214 and supporting the battery cells 20.

[0418] For ease of explanation, in some embodiments, the length direction of the housing 10 is the arrangement direction of the multiple battery cells 20, i.e., the second direction, i.e., one of the horizontal directions. The length direction Y and the vertical direction Z are perpendicular to each other, and when the included 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 are considered to be perpendicular to each other. Note that the length direction Y may be in another direction, and the length direction Y may not be perpendicular to the height direction Z, and explanations thereof will be omitted in this application.

[0419] The multiple protective strips 41 are spaced apart along the length direction Y, i.e., the protective assembly 40 is arranged along the length direction Y between the multiple battery cells 20 and the bottom cover 12. As an example, the protective strips 41 may be formed in a strip shape, protruding from the bottom cover 12 along the vertical direction Z and fixed to the battery cells 20, with the pressure reducing mechanism 213 and electrode terminals 214 of the battery 100 located between two adjacent protective strips 41, thereby providing protection for the pressure reducing mechanism 213 and electrode terminals 214.

[0420] In some embodiments, as shown in FIG. 42 , the multiple protective strips 41 include an edge protective strip 411, a first protective strip 412, and a twentieth protective strip 413, and along the length direction Y, the edge protective strips 411 are installed on both edges of the arrayed multiple battery cells 20, and the first protective strips 412 and the second protective strips 413 are alternately arranged between the two edge protective strips 411.

[0421] The edge protection strips 411 are installed on both edges of the arrayed battery cells 20, i.e., on the edges of the outermost battery cells 20 in the array, thereby providing support to both battery cells 20 at positions adjacent to the housing 10. The first protection strips 412 and the second protection strips 413 are alternately arranged between the two edge protection strips 411, which allows the protection strips 411 to better fit the array arrangement of the battery cells 20 and thereby provide better support to the battery cells 20.

[0422] For ease of explanation, in the embodiments of the present application, the width direction of the housing 10 is referred to as the first direction X, i.e., another horizontal direction. The length direction Y, the vertical direction Z, and the width direction X are perpendicular to one another, and when the included angle between the length direction Y, the vertical direction Z, and the width direction X is between 85° and 90°, the three are considered to be perpendicular to one another. Note that the width direction X may be another direction, and the width direction X may not be perpendicular to the length direction Y and the vertical direction Z, and a description of such an embodiment will be omitted here.

[0423] In some embodiments, as shown in FIGS. 41 and 42 , multiple battery cells 20 are electrically connected via bus members 24. The bus members 24 connect the electrode terminals 214 of adjacent battery cells 20 across the electrode terminals 214, thereby connecting the multiple battery cells 20 in series, parallel, or series-parallel. In some embodiments of the present application, since the bus members 24 connect the electrode terminals 214 of adjacent battery cells 20 across the electrode terminals 214 in the length direction Y, at least some of the protective strips 41 include notches to allow the bus members 24 to escape. The notches may be provided at one end of the corresponding protective strip 41, or may have other positions, which are determined according to the arrangement of the bus members 24 and are not specifically limited. 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, and the second protective strip 413 allows the bus members 24 to escape.

[0424] The first protective strip 412 and the second protective strip 413 have different lengths in the width direction X, allowing the protective members to allow the bus members 24 to escape. This allows the protective assembly 40 to better fit the structure of the battery 100 and facilitates the realization of series, parallel, and series-parallel connections between the battery cells 20.

[0425] Alternatively, when the bus members 24 are 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 changed based on specific circumstances.

[0426] Alternatively, the extension length of the protective strip 41 may refer only to the sum of the lengths of the protective strip 41 in the width direction X, and the sum of the lengths of the second protective strip 413 is smaller than that of the first protective strip 412, that is, the second protective strip 413 can allow the bus members 24 to escape at any position, which may be one end of the second protective strip 413 or the center of the second protective strip 413, and is determined based on the arrangement of the bus members 24.

[0427] In some embodiments, as shown in FIG. 42 , the protective assembly 40 further includes a main plate 42, the protective strip 41 is connected to the main plate 42, the main plate 42 is positioned between the protective strip 41 and the bottom wall 102, and the protective strip 41 is installed on the surface of the main plate 42 facing the top of the housing 10.

[0428] Of course, the main plate 42 can also be called a connecting plate.

[0429] Alternatively, there may be a plurality of protective strips 41, and the plurality of protective strips 41 may be installed on the surface of the main plate 42 facing the top of the housing 10, and the main plate 42 may be installed close to the bottom wall 102. The relative positions of the plurality of protective strips 41 may be stabilized via the main plate 42, thereby preventing displacement after an impact.

[0430] The main plate 42 is installed to extend in the same direction as the bottom wall 102 and abuts against the bottom wall 102, and may be further restricted by a groove or the like installed in the bottom wall 102. The main plate 42 is installed between the protective strip 41 and the bottom wall 102 and extends to cover a large area, which improves the insulation performance between the bus members 24 and the battery cells 20 and the bottom wall of the housing 10.

[0431] Optionally, the thickness of the main plate 42 may be greater than 0.5 mm to provide the necessary protective strength.

[0432] Optionally, the main plate 42 is fixedly connected to the bottom wall 102, which helps to securely install the main plate 42 and improves the structural robustness of the battery 100; for example, the main plate 42 is adhesively fixed to the bottom wall 102, making assembly easy.

[0433] Alternatively, the main plate 42 may abut against the bottom wall 102, but the present invention is not limited thereto.

[0434] In some embodiments, the main plate 42 and the protective strip 41 are integrally formed or detachably connected, which facilitates processing of the main plate 42 and the protective strip 41. When the protective strip 41 and the main plate 42 are integrally formed, the manufacturing of the protective assembly 40 is facilitated. When the protective strip 41 is detachably connected to the main plate 42, the position of the protective strip 41 can be easily adjusted based on the arrangement of the battery cells 20, and the protective assembly 40 has a wider range of applications.

[0435] In an alternative embodiment, the protection assembly 40 is adhesively fixed to the battery cell 20. In the present embodiment, the protection assembly 40 abuts against the shoulder portion of the battery cell 20, and in this case, the two may be adhesively fixed, which further improves the overall strength and connection stability and prevents displacement between the protection assembly 40 and the battery cell 20 due to impact. Optionally, each protection strip in the protection assembly 40 may be adhesively attached to a corresponding position on the battery cell 20, or at least a portion of the protection strip may be adhesively attached to the battery cell 20, and an edge protection strip 411 may be included.

[0436] In some embodiments, as shown in FIG. 18 , the end cover 212 includes a functional area 206 and a shoulder portion 207, the electrode terminals are installed in the functional area 206, the shoulder portions 207 are located on both sides of the functional area 206 along the second direction y, the battery cells 20 abut against the protective strip 41 via the shoulder portions 207, and the second direction y is perpendicular to the vertical direction.

[0437] Of course, the end cover 212 may also be referred to as a top cover plate.

[0438] The functional area 206 refers to an area where the battery cell 20 installed on the end cover 212 can perform its own function or an area where the battery cell 20 can interact with the outside, such as an electrode terminal that allows the battery cell 20 to be electrically connected to the outside. Because the electrode terminal or other functional members are always installed in the functional area 206, the functional area 206 is not suitable for receiving force during use of the battery 100. The shoulder portion 207 refers to an area of ​​the end cover 212 other than the functional area 206 that can receive force.

[0439] The functional area 206 is disposed between the shoulder portions 207, which can provide a certain protection for the functional area 206. The battery cells 20 abut against the protective strips 41 via the shoulder portions 207, allowing the battery 100 to have a more compact structure, preventing the functional area 206 from being damaged by force, and extending the service life of the battery cells 20.

[0440] Optionally, the protective strip 41 is fixedly connected to the shoulder portion 207 .

[0441] In some embodiments, the electrode terminal 214 is disposed between two adjacent protective strips 41, and the electrode terminal 214 and the bottom wall 102 (eg, bottom cover 12) are disposed with a gap therebetween.

[0442] The functional area 206 is located between two shoulder portions 207, and the shoulder portions 207 abut against the protective strips 41, so that the electrode terminals 214 of the functional area 206 are also located between two adjacent protective strips 41. The electrode terminals 214 and the bottom wall 102 are spaced apart, i.e., the electrode terminals 214 do not contact the bottom wall 102 and can be considered to be floating between the two protective strips 41, which makes it easier to extract electrical energy from the battery cells 20 via the electrode terminals 214 and improves the usability of the battery cells 20.

[0443] Alternatively, the pressure reducing mechanism and the electrode terminals of the battery cell 20 may be arranged on the same side of the battery cell 20, the pressure reducing mechanism 213 may also be arranged facing the bottom wall 102, the pressure reducing mechanism 213 and the electrode terminals 214 may be arranged in the functional area 206, and the electrode terminals 214 may be arranged on both sides of the pressure reducing mechanism 213 within the functional area 206, thereby reducing the influence of the electrode terminals 214 when the pressure reducing mechanism 213 is depressurized.

[0444] In some embodiments, as shown in FIG. 44 , the thickness of the protective strip 41 in the vertical direction (e.g., the thickness direction of the main plate) is greater than the extension height of the electrode terminal 214 exposed to a portion of the battery cell 20, and the electrode terminal 214 is suspended between adjacent protective strips 41 to prevent it from coming into contact with other components and affecting its functionality.

[0445] In some embodiments of the present application, as shown in FIGS. 43 and 44, the shoulder portions 207 of two adjacent battery cells 20 both abut against the same protective strip 41.

[0446] One or more battery cells 20 may be installed in the housing 10. When more than one battery cell 20 is installed in the housing 10, the battery cells 20 are arranged adjacent to each other in the housing 10, and the protective strips 41 are installed along the main plate 42 at intervals in the first direction X. Therefore, the shoulder portions 207 are located on both sides of the functional area 206 in the first direction X, and the shoulder portions 207 can be located at the connection portions of the adjacent battery cells 20, so that the shoulder portions 207 of the two adjacent battery cells 20 can both abut against the same protective strip 41.

[0447] The battery cells 20 adjacent to each other in the first direction X share the same protective strip 41, which can minimize the number of protective strips 41 and facilitate the manufacture of the protective assembly 40.

[0448] In some embodiments of the present application, as shown in Figures 18 and 42, in the first direction x, the width D11 of the protective strip 41 (e.g., the width D1 of the edge protective strip 411, the width D2 of the first protective strip 412, and the width D3 of the second protective strip 413 in the present application) and the extension width D4 of the shoulder portion 207 satisfy 0.5D4≦D11≦2D4.

[0449] If the width D11 of the protective strip 41 is 0.5 times or more the extension width D4 of the shoulder portion 207, it can provide sufficient support for the battery cells 20. When two adjacent battery cells 20 are simultaneously placed on the protective strip 41, if the width of the protective strip 41 in the second direction Y is no more than twice the extension width of the shoulder portion 207, the protective strip 41 will only come into contact with the shoulder portions 207 of the two adjacent battery cells 20, and will avoid contact with the functional area 206 and affecting the function of the battery cells 20.

[0450] Preferably, the relationship between the width D11 of the protective strip 41 and the extension width D4 of the shoulder portion 207 may satisfy D4≦D11≦2D4. Because the protective strip 41 may be offset from adjacent battery cells 20, the width of the mounting strip 41 in the longitudinal direction Y is set to be equal to or greater than the extension width of the shoulder portion 207, so that two adjacent battery cells 20 can be mounted on the protective strip 41 at the same time, without causing the problem of poor structural stability due to uneven forces being applied to the battery 100 when only one battery cell is mounted due to offsetting.

[0451] In some embodiments, the protective strip 41 abuts against the electrode terminal 214, or the protective strip 41 and the electrode terminal 214 are spaced apart, thereby allowing flexible placement of the protective strip 41.

[0452] In some embodiments, as shown in FIGS. 18, 43 and 44, the orthogonal projection of the electrode terminal 214 on the bottom wall 102 is located between the orthogonal projections of the adjacent protective strips 41 on the bottom wall 102 .

[0453] In the embodiment of the present application, the protection assembly 40 includes a plurality of protection strips 41, which abut against the battery cells 20. The orthogonal projection of the electrode terminals 214 on the bottom wall of the battery cells 20 may be located between adjacent protection strips. In this case, the protection strips 41 abut against the shoulders of the battery cells 20, and the connection between the electrode terminals 214 and the bus members 24 is not obstructed by the protection assembly 40. After the battery cells 20 are mounted on the protection assembly 40, the electrode terminals 214 can be dropped between adjacent protection strips 41, so that the force generated by the impact can be distributed among the plurality of battery cells 20, preventing the electrode terminals 214 from being damaged by the impact.

[0454] In some embodiments, as shown in FIGS. 41 and 42 , the electrode terminals 214 of two adjacent battery cells 20 are electrically connected via a bus member 24, and the extension length of one of the two adjacent protective strips 41 in the second direction y is smaller than the extension length of the other, thereby forming a relief notch 43, which is used to allow the bus member 24 to escape.

[0455] The bus members 24 are members that realize electrical connection between the multiple battery cells 20. The bus members 24 connect across the electrode terminals 214 of adjacent battery cells 20, and connect the multiple battery cells 20 in series, parallel, or series-parallel. Because the bus members 24 connect across the electrode terminals 214 of adjacent battery cells 20 in the second direction Y, at least a portion of the protective strips 41 extending along the first direction X must be allowed to escape, and thus relief notches 43 are formed.

[0456] The extension length of one of two adjacent protective strips 41 is shorter than the extension length of the other, i.e., the protective strips 41 with longer extension lengths and the protective strips 41 with shorter extension lengths are arranged alternately. Optionally, the length of the protective strips 41 may be adjusted according to the arrangement of the bus members 24. Furthermore, the extension length of the protective strips 41 in the first direction X simply refers to the total length of the protective strips 41 in the first direction X. That is, the relief notch 43 may be located at one end of the protective strip 41 or in the center of the protective strip 41, and is determined according to the arrangement of the bus members 24. The embodiment of the present application is not particularly limited thereto.

[0457] The protection strip 41 is provided with a relief notch 43, which allows the protection assembly 40 to better fit the structure of the battery 100 and facilitates the realization of series connection, parallel connection and series-parallel connection of the battery cells 20.

[0458] In some optional embodiments, as shown in FIG. 18 , the battery cell 20 further includes a pressure reducing mechanism 213, which is installed on the same side as the electrode terminal 214. By similarly installing the pressure reducing mechanism 213 on the underside of the battery cell 20, it can be protected together with the electrode terminal 214, avoiding collision with the casing 10, etc., and improving the safety and reliability of the entire battery 100.

[0459] Optionally, the pressure reducing mechanism 213 and the bottom wall 102 are spaced apart, and the electrode terminals 214 are located on both sides of the pressure reducing mechanism 213 in the second direction y, thereby reducing the impact on the electrode terminals 214 when pressure is released from the pressure reducing mechanism 213. Furthermore, the pressure reducing mechanism 213 and the bottom wall 102 are spaced apart, so that the pressure reducing mechanism 213 does not contact the bottom wall 102, providing a larger pressure reducing space for the pressure reducing mechanism 213, reducing the risk of discharged materials, and improving the safety of the battery 100.

[0460] 18, 43, and 44, the orthogonal projection of the pressure reducing mechanism 213 on the bottom wall 102 is located between the orthogonal projections of the adjacent protective strips 41 on the bottom wall 102. When the battery cell 20 and the protective assembly 40 are combined, the pressure reducing mechanism 213 can be installed to be located between the areas where the adjacent protective strips 41 and the battery cell 20 abut against each other, i.e., the pressure reducing mechanism 213 is installed on the side close to the bottom wall 102 and does not contact the protective assembly 40, so that when an external impact is received, the impact force can be dispersed to the shoulder of the battery cell 20, preventing the pressure reducing mechanism 213 from being damaged by the impact and improving the safety of the battery 100.

[0461] In some embodiments, as shown in FIG. 42, 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 portion 207 (see FIG. 18) satisfy 0.2D4≦D1≦D4, 0.5D4≦D2≦2D4, and 0.5D4≦D3≦2D4.

[0462] The edge protection strip 411 is installed at the edge of the battery cell 20 array, and the edge protection strip 411 only contacts the shoulder portion 207 on one side of the edge battery cell 20 in the length direction Y. The width D1 of the edge protection strip 411 is less than or equal to the width D4 of the shoulder portion 207, so as to prevent the edge protection strip 411 from contacting the functional area 206 and affecting the function of the battery cell 20. The width D1 of the edge protection strip 411 is at least 0.2 times the width D4 of the shoulder portion 207, so that the edge protection strip 411 can provide sufficient support for the battery cell 20.

[0463] Because the first protective strip 412 is installed between adjacent battery cells 20, the width D2 of the first protective strip 412 is at least 0.5 times the extension width D4 of the shoulder portion 207, which can provide sufficient support for the battery cells 20. Preferably, when the width D2 of the first protective strip 412 is at least D4 of the extension width D4 of the shoulder portion 207, two adjacent battery cells 20 can be placed on the protective strip 412 at the same time, without causing problems such as the battery 100 receiving uneven force due to only one of the cells being offset and therefore reducing structural stability. The width D2 of the first protective strip 412 is no more than twice the width D4 of the shoulder portion 207, which can prevent the first protective strip 412 from contacting only the shoulder portions 207 of the two adjacent battery cells 20 when two adjacent battery cells 20 are placed on the protective strip 412 at the same time, thereby avoiding contact with the functional area 206 and affecting the function of the battery cells 20.

[0464] Similar to the first protective strip 412, the width D3 of the second protective strip 413 may be 0.5 times or more the extension width D4 of the shoulder portion 207, and may be 2 times or less the width D4 of the shoulder portion 207.

[0465] 41 and 42 , the protective assembly 40 further includes a main plate 42, which is disposed between the protective strip 41 and the bottom wall 102, thereby absorbing and dispersing external impact forces in the horizontal direction, and the protective strip 41 is disposed to protrude vertically from the main plate 42, so that the protective strip 41 can form a protrusion. Illustratively, the housing 10 includes a bottom cover 12, the wall of the bottom cover 12 facing the battery cells 20 being formed as the bottom wall 102, and the main plate 42 being disposed between the protective strip 41 and the bottom cover 12.

[0466] By installing the main plate 42, the multiple protective strips 41 in the protective assembly 40 can be integrated together, and the main plate 42 extending in the longitudinal direction Y can be installed to distribute the force received by the protective assembly 40, thereby improving the structural strength of the battery 100.

[0467] In some examples, the protection assembly 40 is also referred to as a mounting assembly, and the protection strip 41 is also referred to as a mounting strip, and the mounting assembly includes a main plate and a mounting strip.

[0468] Optionally, the protective assembly 40 is an insulating member to avoid affecting the electrical connections between the battery cells 20. The insulating member may be an insulating material entirely, or an object whose surface is coated with an insulating material (such as an insulating coating) to provide overall insulation. When the protective assembly 40 is an object whose surface is coated with an insulating material, the core may be a metal material, an insulating material, or a composite material, and the outer surface of the core is coated with an insulating material. At the same time, the protective strip 41 and the main plate 42 must have a certain hardness and elasticity to provide support for the battery cells 20 and also to be able to generate a certain amount of deformation when subjected to an impact, thereby providing protection for the battery cells 20.

[0469] Alternatively, the protective strip 41 and the main plate 42 may be integrally molded, which facilitates the manufacture of the protective assembly 40. The protective strip 41 and the main plate 42 may be detachably connected to each other, which allows for easy adjustment of the position of the protective assembly 40 based on the arrangement of the battery cells 20, and the protective assembly 40 has a wider range of application scenarios.

[0470] In some embodiments, the main plate 42 is fixedly connected to the bottom cover 12, thereby improving the structural robustness of the battery 100. Alternatively, the main plate 42 may abut the bottom wall 102, for example, the main plate 42 abuts the bottom cover 12, although embodiments of the present application are not limited thereto.

[0471] In some embodiments, as shown in FIG. 16, there is a first distance H1 between the end cover 212 of the battery cell 20 and the bottom wall 102, and the first distance H1 is 2 mm.

[0472] 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 refers to the distance in the vertical direction Z between the surface having the electrode terminals of the battery cells 20 and the pressure reducing mechanism and the cover portion 12a. The first distance H1 is 2 mm.

[0473] In some embodiments, the ratio of the first distance H1 to the weight M2 of a single battery cell 20 is 0.2 mm / Kg.

[0474] The ratio H1 / M2 of the first distance H1 to the weight M2 of a single battery cell 20 can indicate the energy density and structural strength of the battery 100. If the ratio of the first distance H1 to the weight M2 of a single battery cell 20 is too large, the energy density of the battery 100 will be too low, and if the ratio of the first distance H1 to the weight M2 of a single battery cell 20 is too small, the structural strength of the battery 100 will be insufficient, which may cause a safety hazard in the event of a collision. Therefore, when H1 / M2 is 0.2 mm / Kg or less,

[0475] ​​​​To verify that a battery 100 with a ratio H1 / M2 of the first distance H1 to the weight M2 of a single battery cell 20 within an appropriate range has good performance, a collision test was performed on the battery 100 using a collision test device A, as an example. As shown in FIG. 45, the collision test device A includes an impact head A1, a launcher A2, and a frame A3. During the test, the battery 100 is placed on the frame A3, and the impact head A1 is driven by the launcher A2 to collide with the battery 100 at a constant speed. The test conditions can be selected as follows: the impact direction is the vertical direction Z, the impact position is at a weak point of the battery 100, and the impact energy is 90 J.

[0476] Since the battery 100 is applied to a power-consuming device such as a vehicle 1000, the top of the housing 10 is attached to the vehicle 1000, and the battery 100 is impacted in the vertical direction Z against the bottom of the battery 100, thereby simulating the state of the battery 100 after it has been installed in the vehicle 1000. The weak point of the battery 100 is a location on the battery 100 that is susceptible to destruction, and this location is always located within a 240 mm radius from the geometric center of the battery 100. By impacting the weak point of the battery 100, the state of the battery 100 after impacting a location where the battery's structural strength is weak can be simulated. The impact energy is 90 J, which may be equivalent to an impact head A1 impacting the battery 100 at a speed of 4.2 m / s. However, other impact energies, such as 120 J (impact speed 4.9 m / s) or 150 J (impact speed 5.5 m / s), may also be used. In the course of an actual experiment, the battery 100 may be hit multiple times with one collision energy, or may be hit multiple times with multiple collision energies.

[0477] After the battery 100 is crashed by the crash test device A, it is observed for two hours at ambient temperature to detect whether or not there is any fire or explosion of the battery 100. Optionally, after the crash test of the battery 100 is performed by the crash test device A, the battery 100 may be further subjected to a test such as a protection rating test of the housing, but the embodiment of the present application is not limited thereto.

[0478] Table 7 shows the results of a collision test performed on the battery 100 using the above method, with different values ​​being used for the first distance H1, the weight M2 of the single battery cell 20, and the value of H1 / M2.

[0479] Table 7 JPEG2025504528000008.jpg60130

[0480] As shown in Table 7, 2 mm

[0481] In some embodiments, as shown in FIG. 42, the extension height of the protective strip 41 in the height direction Z (i.e., the vertical direction) of the housing 10 is a second distance N6, which satisfies 0.5 mm≦N6≦30 mm.

[0482] The protective strip 41 has a certain dimension in the height direction Z and can protrude from the main plate 42 to support and place the battery cell 20. A second distance N6 can be set to maintain a certain distance between the end cover 212 of the battery cell 20 and the bottom wall 102, thereby maintaining an appropriate energy density of the battery 100.

[0483] The ratio N6 / M2 of the second distance N6 to the weight M of a single battery cell 20 can indicate the energy density and structural strength of the battery 100. If the ratio N6 / M2 of the second distance N6 to the weight M2 of a single battery cell 20 is too large, the energy density of the battery 100 will be too low, and if the ratio N6 / M2 of the second distance N6 to the weight M2 of a single battery cell 20 is too small, the structural strength of the battery 100 will be insufficient, which may result in a safety hazard in the event of a collision. Therefore, if the ratio N6 / M2 of the second distance N6 to the weight M2 of a single battery cell 20 satisfies 0.05 mm / Kg≦N6 / M2≦50 mm / Kg, the battery 100 will have good energy density and appropriate structural strength within this range.

[0484] ​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 an appropriate range, a structural strength test can be performed on the battery 100. In the process of performing the structural strength test on the battery 100, the structural strength of the battery 100 can be determined by a number of tests, such as a shear strength test and a compressive strength test, for example.

[0485] In a shear strength test, for example, the battery 100 is fixed between the fixtures of a shear tester, and then the detection head of the shear tester is used to drive the battery 100, moving it along the length direction Y or width direction X at a speed of 5 mm / min, and the tensile force F applied by the detection head is recorded when the housing 1 is broken. The projected area of ​​the battery 100 in the height direction Z is defined as area A, and the value of F / A is the shear strength that the battery 100 can withstand.

[0486] In the compressive strength test, for example, a pressure head is used to apply pressure to the battery 100 in the height direction Z and the length direction Y or the width direction X, and is propelled toward the battery 100 at a speed of 2 m / s. When the pressing force reaches 50 kN or the deformation of the battery 100 reaches 30%, the pressure head is stopped and held for 10 minutes. After the compressive strength test, the battery 100 is left to stand at ambient temperature for 2 hours and observed.

[0487] Optionally, the structural strength of the battery 100 can be tested by other structural strength tests, and the embodiments of the present application are not limited thereto.

[0488] Table 8 shows the results of a structural strength test performed on the battery 100 using the above method when the battery cell 20 is fixed to the protective strip 41 and different values ​​are used for the second distance N6, the weight M2 of a single battery cell 20, and the value of N6 / M2.

[0489] Table 8 JPEG2025504528000009.jpg60130

[0490] As shown in Table 8, when N6 satisfies 0.5 mm≦N6≦30 mm and N6 / M2 satisfies 0.05 mm / Kg≦N6 / M2≦50 mm / Kg, the battery 100 has relatively good structural strength in the structural strength test.

[0491] 42 and 44, in some embodiments, the thickness of the protective strip 41 is a second distance N6 in the vertical direction, and the cover portion 12a of the bottom cover 12 protrudes from the extending surface of the bottom wall 102 relative to the mounting portion 12b, so that the vertical distance between the cover portion 12a and the mounting portion 12b is a fourth dimension D8. The protective assembly 40 is installed between the battery cells 20 and the bottom cover 12, and the protective assembly 40 may have a shape that engages with the cover portion 12a, and the vertical dimension of the main plate 42 is a sixth dimension D10.

[0492] To ensure that the battery 100 has appropriate energy density and structural strength, the sum of the second distance N6 and the sixth dimension D10 should be equal to or greater than the fourth dimension D8, i.e., N6 + D10 ≥ D8 is satisfied. That is, in the first direction X, the overall dimension of the protection assembly 40 is greater than the difference in distance between the cover portion 12a and the mounting portion 12b, so that the protection assembly 40 is fixed to the battery cell 20, maintains a distance between the battery cell 20 and the cover portion 12a of the bottom cover 12, and leaves sufficient ejection space for the pressure reducing mechanism 213 when both the pressure reducing mechanism 213 and the electrode terminal 214 face the bottom cover 12.

[0493] In another alternative embodiment, the protection assembly 40 abuts against the battery cell 20, and at this time the second distance N6 satisfies 5 mm≦N6≦30 mm, and the ratio N6 / M2 of the second distance N6 to the weight M2 of a single battery cell 20 satisfies 0.5 mm / Kg≦N6 / M2≦50 mm / Kg, preferably 1 mm / Kg≦N6 / M2≦30 mm / Kg, within which range the battery has good energy density and appropriate structural strength.

[0494] Table 9 shows the results of a collision test performed on a battery 100 using the above-mentioned collision test method, with different values ​​for the weight M2 and N6 / M2 of a single battery cell 20 at the second distance N6 when the protection assembly 40 abuts against the battery cell 20.

[0495] Table 9 JPEG2025504528000010.jpg54130

[0496] As shown in Table 9, when N6 satisfies 5 mm≦N6≦30 mm and N6 / M2 satisfies 0.5 mm / Kg≦N6 / M2≦50 mm / Kg, the battery 100 will not ignite or explode in a crash test of a certain strength, and has relatively good safety.

[0497] In some embodiments, as shown in Figures 24 and 25, the battery 100 further includes a connection plate 91 and a connector 92, the connection plate 91 is provided on one side of the housing 10 and protrudes along the horizontal direction (e.g., the second direction y), the connection plate 91 and the bottom wall 102 form a storage section 911 in the vertical direction, the connector 92 is provided in the storage section 911 and connected to the connection plate 91, and the connector 92 and the battery cell 20 are electrically connected.

[0498] Of course, the connection plate 91 may also be referred to as an adapter plate, and the connector 92 may also be referred to as an adapter.

[0499] 24 and 25, connecting plate 91 is a boss extending from one side of housing 10 in the second direction y, and has a thickness difference with the bottom wall 102 of housing 10 in the vertical direction z, and storage section 911 is a space created by this thickness difference and formed by the surfaces where connecting plate 91 and housing 10 are connected, and is used to install connector 92 therein. Installing connector 92 in storage section 911 can protect connector 92 and reduce the impact force that connector 92 receives in a collision.

[0500] The battery 100 is electrically connected to an external device via the connector 92, and therefore the connector 92 needs to be electrically connected to the battery cell 20, meaning that the connector 92 is electrically connected to the battery cell 20 via a current path installed inside the connection plate 91, so that the electrical energy of the battery cell 20 inside the housing 10 can be obtained and supplied to an external power consumption device.

[0501] The horizontal direction intersects with the vertical direction means that the extension directions of the connecting plate 91 and the housing 10 form a certain angle, but should not be parallel to the housing 10, so that the connector 92 can be easily installed in the receiving portion 911 between the connecting plate 91 and the housing 10. In the embodiments of the present application, for ease of explanation, the horizontal direction and the vertical direction are perpendicular to each other. Optionally, the horizontal direction and the vertical direction do not have to be perpendicular to each other.

[0502] In some embodiments, the connector 92 does not extend vertically beyond the extension surface of the bottom wall 102. This allows the connector 92 to be located entirely within the storage portion 911, avoiding contact with external devices located around the circumference of the battery 100 and reducing the influence of the connector 92 during the process of electrically connecting the battery cell 20 and the external device.

[0503] In some embodiments, an opening 10c is formed in the bottom wall of the housing 10, and the housing 10 further includes a frame 11b arranged along the periphery of the opening 10c, the frames 11b being connected to each other to form a frame structure, and the connecting plate 91 and the frame 11b being integrally molded.

[0504] In the housing 10, the frame 11b is installed vertically next to the mounting member 11a in top-to-bottom order. The frame 11b is a plate extending vertically and is installed to surround the mounting member 11a. An opening 10c is formed in the bottom of the housing 10, providing a space inside the housing 10 that can accommodate the battery cells 20. By having the connecting plate 91 extend from one side of the frame 11b and being molded integrally with the frame 11b, the bearing strength of the connecting plate 91 can be improved.

[0505] Alternatively, 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 welding, adhesive, fasteners, or a flow drill screw process. Similarly, the connecting plate 91 and the mounting member 11a, and the frame 11b and the mounting member 11a may also be integrally formed or fixedly connected in the above manner, and the embodiment of the present application is not limited thereto.

[0506] In some embodiments of the present application, as shown in Figures 24 and 25, the surface of the connecting plate 91 facing the storage section 911 is a first protective surface 911a, the surface of the frame 11b facing the storage section 911 is a 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 installed with a gap between them.

[0507] That is, the first protective surface 911a is the surface of the connecting plate 91 that is away from the top of the housing 10, and the second protective surface 911b is the surface of the frame 11b of the housing 10 that is close to the connecting plate 91, and the first protective surface 911a and the second protective surface 911b are connected to form the storage section 911. The connector 92 extends vertically from the first protective surface 911a, thereby protruding into the storage section 911, but does not come into contact with the second protective surface 911b, thereby reducing the impact that the connecting plate 91 may receive in the event of a collision.

[0508] Alternatively, the first protective surface 911a and the second protective surface 911b may be connected perpendicularly to each other, i.e., 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, whereby the first protective surface 911a and the second protective surface 911b are perpendicular to each other, increasing the installation space of the connector 92 and maximizing the storage section 911.

[0509] 24 and 25, in the vertical direction z, the thickness of the connecting plate 91 is a first dimension D5, the extension height of the connector 92 is a second dimension D6, and the extension height of the frame 11b is a third dimension D7. The sum of the first dimension D5 and the second dimension D6 is less than or equal to the third dimension D7, i.e., D5+D6≦D7, so that the connector 92 is located completely within the housing portion 911, thereby providing protection for the connector 92.

[0510] In an alternative embodiment, the connector 92 may extend along the vertical direction Z and face the extending surface where the bottom wall 102 of the housing 10 is located. By adopting this structure, the connector 92 can be electrically connected to an external device, and the connector 92 has better strength-bearing performance than a connector 92 installed horizontally.

[0511] 11, 26, and 27, the housing 10 further includes a bottom cover 12 disposed in the opening 10c, and the bottom cover 12 is connected to the frame 11b. The bottom cover 12 covers the opening 10c, and the housing 100 has a relatively sealed structure. The bottom cover 12 includes a cover portion 12a and a mounting portion 12b, and the mounting portion 12b is disposed circumferentially around the cover portion 12a and engages with the frame 11b. That is, the cover portion 12a covers the opening 10c formed by the frame 11b, the mounting portion 12b is fixed to the frame 11b, and the bottom cover 12 is connected to the frame 11b.

[0512] In the vertical direction z, the cover portion 12a protrudes from the extending surface of the bottom wall 102 relative to the mounting portion 12b, thereby providing a larger distance between the bottom cover 12 and the battery cells 20 installed inside the housing 10, thereby allowing the bus members 24 or other members between the electrode terminals 214 of the battery cells 20 to escape and preventing the bottom cover 12 and the electrode terminals 214 of the battery cells 20 from being too close to each other. Note that the protruding 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 so large as to increase the volume of the battery 100 and reduce the energy density of the battery 100.

[0513] Furthermore, when the pressure reducing mechanism 213 is installed facing the bottom wall of the receiving cavity 10a, the pressure reducing mechanism 213 may be installed facing the opening 10c, and in the event of thermal runaway of the battery cell 20, the pressure reducing mechanism 213 will spray toward the bottom cover 12. At this time, the structure in which the cover part 12a protrudes from the extending surface of the bottom part 102 relative to the mounting part 12b allows the pressure reducing mechanism 213 to have a larger spray space. In addition, the pressure reducing mechanism 213 sprays toward the bottom, i.e., the spray direction is toward the ground, which improves the safety of the battery 100.

[0514] In some embodiments, the bottom cover 12 and the frame 11b are removably connected to each other, which facilitates assembly of the battery 100. For example, as shown in Figures 26 and 27, the bottom cover 12 and the frame 11b are removably connected to each other via fastening members 13 such as bolts, but the bottom cover 12 and the frame 11b may be fixedly connected to each other in other ways, and the embodiments of the present application are not limited thereto.

[0515] In some embodiments, the housing 10 includes a mounting member 11a installed on the top, and the battery cells 20 are connected to the mounting member 11a.

[0516] The mounting member 11a is a plate extending in the second direction y at the top of the housing 10. The mounting member 11a can increase the rigidity of the top of the battery 100, reducing the possibility of the battery 100 being damaged in a collision. The battery cells 20 are connected to the mounting member 11a, i.e., the battery cells 20 are installed on top of the battery 100, increasing the rigidity of the top of the battery 100 and reducing the possibility of the battery 100 being damaged in a collision, thereby improving the safety of the battery 100.

[0517] Alternatively, the battery cells 20 may be directly glued and fixed to the mounting member 11a, or may be fixed to the mounting member 11a using other methods such as bolt connection, and the embodiment of the present application is not limited thereto.

[0518] 24 and 25, in some embodiments, the surface of the connecting plate 91 facing away from the storage portion 911 and the surface of the mounting member 11a facing away from the opening 10c are located on the same horizontal plane. That is, the connecting plate 91 and the mounting member 11a are located on one side of the upper surface of the housing 11 and are located on the same plane, so that when the battery 100 is fixed to an external device, the connecting plate 91 and the mounting member 11a can be fixed to the same surface of the external device. Furthermore, since the surfaces on one side of the connecting plate 91 and the mounting member 11a are located on the same horizontal plane, the bearing strength of both can be improved, and the battery 100 has better bearing strength.

[0519] The connecting plate 91 protrudes from the extending surface of the bottom wall 102 in the vertical direction z, i.e., the connecting plate 91 has a constant thickness in the vertical direction. In the event of a collision, the surface of the connecting plate 91 away from the housing 10 may be subjected to a certain impact force. The constant thickness of the connecting plate 91 improves the rigidity of the connecting plate 91 and provides better protection for the connector 92.

[0520] Alternatively, the connecting plate and the housing 10 may be installed as a single unit, or the connecting plate may be positioned and connected to the housing 10 by a fixed connection method such as welding, adhesive connection, or FDS connection, and the present application is not particularly limited thereto.

[0521] In some embodiments, as shown in Figures 11 and 18, the battery 100 includes battery cells 20 and a reinforcing element 30, a mounting member 11a is provided on the upper part of the housing 10, and the multiple battery cells 20 are arranged along the second direction y, i.e., the second direction y is the arrangement direction of one row of the battery cells 20 in the battery 100.

[0522] The battery cell 20 includes a first wall 201 and a first outer surface m1, the first wall 201 being the wall with the largest surface area in the battery cell 20, and the first outer surface m1 being connected to the first wall 201. The reinforcing element 30 extends along the second direction y and is connected to the first wall 201 of each battery cell 20 in the plurality of battery cells 20, thereby increasing the contact area between the reinforcing element 30 and the battery cell 20 and ensuring the connection strength between the reinforcing element 30 and the battery cell 20. That is, the first wall 201 of the battery cell 20 faces the reinforcing element 30, i.e., the first wall 201 of the battery cell 20 is parallel to the second direction y.

[0523] The mounting member 11a is connected to the first outer surface m1 of each of the plurality of battery cells 20, and when the battery cells 20 are installed in the power consumption device, the battery cells 20 are located below the mounting member 11a, and the mounting member 11a is used to mount the battery cells 20.

[0524] The mounting member 11a may be an upper cover of the housing 10 of the battery 100, or may be part of a power consumption device such as the chassis of the vehicle 1000. When the mounting member 11a is the chassis of the vehicle 1000, the first outer surface m1 of the battery cell 20 is connected to the mounting member 11a, i.e., the first outer surface m1 of the battery cell 20 is connected to the chassis surface of the vehicle 1000. The battery cell 20 is directly connected to the chassis surface of the vehicle, which eliminates the need for an upper cover of the housing of the battery 100, thereby saving space that would be occupied by the upper cover of the housing of the battery 100, improving the space utilization rate of the battery 100, and improving the energy density of the battery 100.

[0525] In the embodiment of the present application, a reinforcing element 30 is installed on the battery 100, and the reinforcing element 30 is connected to the first wall 201 of each of the plurality of battery cells 20 arranged in a row along the second direction y, the first wall 201 having the largest surface area, so that the plurality of battery cells 20 are connected together via the reinforcing element 30. In this case, no side panels or additional structures such as beams are required inside the battery 100, which significantly improves the space utilization rate within the battery 100 and improves the structural strength and energy density of the battery 100. A mounting member 11a is further installed on the battery 10, and the mounting member 11a is connected to the first outer surface m1 of each of the plurality of battery cells 20 arranged in the second direction y, the first outer surface m1 being connected to the first wall 201. When the battery cells 20 are installed in a power consumption device, the battery cells 20 are located below the mounting member 11a and are suspended from the mounting member 11a. As a result, the first outer surface m1 of the battery cell 20 is directly connected to the mounting member 11a, and there is no need to leave any space between the mounting member 11a and the battery cell 20, which further improves the space utilization rate within the battery 10 and increases the energy density of the battery 100. At the same time, the battery cell 20 is suspended from the mounting member 11a, which improves the structural strength of the battery 100. Therefore, the technical solution of the embodiments of the present application can improve the performance of the battery 100.

[0526] In this case, the electrode terminal 214 may be disposed on an outer surface other than the first outer surface m1 of the battery cell 20, i.e., the electrode terminal 214 is disposed on a wall other than the mounting member 11a, thereby eliminating the need to leave space for the electrode terminal 214 between the battery cell 20 and the mounting member 11a, and maximizing the space utilization rate within the battery 100 and improving the energy density of the battery 100. In the examples of Figures 10, 18, and 46(a), the electrode terminal 214 is disposed on the second outer surface m2 that faces the first outer surface m1 of the battery cell 20 along the vertical direction z, and in the example of Figure 46(b), the electrode terminal 214 is disposed on a side wall of the battery cell 20 that is perpendicular to the second direction y.

[0527] In some embodiments, the dimension T1 of the reinforcing element 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.

[0528] If T1 / T2 is too large, the reinforcing element 30 occupies a large space and affects the energy density. Also, if the heat conduction of the reinforcing element 30 to the battery cell 20 is too fast, safety problems may occur. For example, when one battery cell 20 undergoes thermal runaway, there is a possibility that thermal runaway may be caused in other battery cells 20 connected to the same reinforcing element 30. If 0 < T1 / T2 ≤ 7, the energy density of the battery 100 can be guaranteed and the safety performance of the battery 100 can be guaranteed.

[0529] Optionally, further satisfy 0 < T1 / T2 ≤ 1, thereby further improving the energy density of the battery 100 and guaranteeing the safety performance of the battery 100.

[0530] Optionally, the weight M3 of the reinforcing element 30 and the weight M2 of the battery cell 20 satisfy 0 < M3 / M2 ≤ 20. If M3 / M2 is too large, it causes a loss of weight energy density. If 0 < M3 / M2 ≤ 20, the weight energy density of the battery 100 can be guaranteed and the safety performance of the battery 100 can be guaranteed.

[0531] Furthermore, optionally, 0.1 ≤ M3 / M2 ≤ 1, thereby further improving the energy density of the battery 100 and guaranteeing the safety performance of the battery 100.

[0532] In some embodiments, the surface area S3 of the reinforcing element 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.

[0533] S3 is the total surface area of ​​the reinforcing element 30 connected to the battery cell 20. If S3 / S4 is too large, it will affect the energy density. If S3 / S4 is too small, the heat conduction effect will be poor and safety performance will be affected. If 0.2≦S3 / S4≦30, the energy density and safety performance of the battery 100 can be guaranteed.

[0534] Optionally, O2≦S3 / S4≦10 is further satisfied, thereby further improving the energy density of the battery 100 and ensuring the safety performance of the battery 100.

[0535] The specific heat capacity Q of the reinforcing element 30 and the weight M3 of the reinforcing element 30 are 0.02 KJ / (kg 2 / ℃)≦Q / M3≦100KJ / (kg 2 / ℃) is satisfied. Q / M3<0.02KJ / (kg 2 / °C), the reinforcing element 30 will absorb too much energy, causing the temperature of the battery cell 20 to become too low, which may precipitate lithium, and Q / M3 > 100 KJ / (kg 2 / °C), the reinforcing element 30 has poor thermal conductivity and cannot immediately remove the heat. The above design can ensure the safety performance of the battery 100.

[0536] Furthermore, 0.3KJ / (kg 2 / ℃)≦Q / M3≦20KJ / (kg 2 / °C), further ensuring the safety performance of the battery 100.

[0537] In some embodiments, as shown in FIG. 41 , a mounting member 11a is provided on the top of the housing 10, a protection assembly 40 is provided on the bottom of the housing 10, the mounting member 11a is fixedly connected to the battery cells 20, and the protection assembly 40 is fixedly connected to the battery cells 20, thereby fixing the positions of the battery cells 20 and improving the structural stability of the battery 100.

[0538] At this time, the mounting member 11a and the protection assembly 40 are also referred to as support plates.

[0539] Alternatively, the battery cells 20 may be directly attached to the mounting member 11a and the protection assembly 40 by adhesive, or may be fixedly connected to the mounting member 11a and the protection assembly 40 in other ways.

[0540] In conventional battery cells, the pressure reducing mechanism is welded to the battery case and fixed to the battery case. In the event of thermal runaway, the pressure inside the battery cell is released through the pressure reducing mechanism, thereby improving the safety of the battery cell. For example, if the pressure reducing mechanism is an explosion-proof sheet on the end cover of the battery case, when the battery cell experiences thermal runaway, the explosion-proof sheet is destroyed and the waste materials inside the battery cell are released, thereby achieving the purpose of releasing the pressure inside the battery cell. Because the pressure reducing mechanism is welded to the battery case, cracks may occur at the welded position during long-term use of the battery cell, reducing the strength of the welded position. This can easily lead to a situation where the welded position is destroyed when the pressure inside the battery cell does not reach the explosion pressure of the pressure reducing mechanism, resulting in the ineffectiveness of the pressure reducing mechanism and low reliability.

[0541] In order to improve the reliability of the pressure reduction mechanism, the inventors have found through research that the pressure reduction mechanism and the battery case of the battery cell can be installed as an integrated structure, i.e., part of the battery case can be used as the pressure reduction mechanism. For example, by locally weakening the end cover, the strength of the end cover can be reduced to form a weakened area, forming an integrated pressure reduction mechanism, which can effectively improve the reliability of the pressure reduction mechanism.

[0542] Thus, in some embodiments, as shown in Figures 48 to 83, the battery cell 20 further includes a battery case 21, an electrode assembly 22 is provided in the battery case 21, a pressure reduction mechanism 213 is installed in the battery case 21, and the pressure reduction mechanism 213 and the battery case 21 are integrally molded to improve the reliability of the pressure reduction mechanism 213.

[0543] In some embodiments, as shown in Figures 48 and 49, the battery case 21 includes an integrally molded non-weakened area 51 and a weak area 52, a groove 53 is provided in the battery case 21, the non-weakened area 51 is formed around the groove 53, and the weak area 52 is formed at the bottom of the groove 53, and the weak area 52 is arranged to be broken when the battery cell 20 releases its internal pressure, and the pressure reduction mechanism 213 includes the weak area 52, thereby further ensuring the reliability of the use of the pressure reduction mechanism 213.

[0544] The battery case 21 is a component that can house the electrode assembly 22 together with other components, and is part of the outer case of the battery cell 20; the end cover (also referred to as a cover plate) of the outer case may be the battery case 21, or the housing 211 of the outer case may be the battery case 21. The battery case 21 may be made of a metal material such as copper, iron, aluminum, steel, or an aluminum alloy, and the battery case 21 may be an aluminum laminate film.

[0545] The weakened region 52 is a portion that is weaker than other regions of the battery case, and when the internal pressure of the battery cell 20 reaches a threshold, the weakened region 52 of the battery case 21 breaks, thereby releasing the pressure inside the battery cell 20. The weakened region 52 may be broken by bursting, peeling, or other methods. For example, when the internal pressure of the battery cell 20 reaches a threshold, the weakened region 52 bursts due to the action of the exhaust (gas, electrolyte, etc.) inside the battery cell 20, allowing the exhaust inside the battery cell 20 to be smoothly released. The weakened region 52 may have various shapes, such as a rectangular, circular, elliptical, annular, arc-shaped, U-shaped, or H-shaped. The thickness of the weakened region 52 may be uniform or non-uniform.

[0546] The weakened region 52 is formed at the bottom of the groove 53, and the groove 53 is formed by pressing, thereby forming the weakened region 52 and the non-weakened region 51 as a single unit. After the groove 53 is press-formed on the battery case, the area of ​​the battery case where the groove 53 is located is thinned, thereby forming the weakened region 52. The groove 53 may be a single-step groove, and the groove side surface of the groove 53 is continuous along the depth direction of the groove 53. For example, the groove 53 is a groove whose internal space is shaped like a rectangular parallelepiped or a column. The groove 53 may be a multi-step groove, and the multi-step grooves are arranged along the depth direction of the groove 53. In adjacent multi-step grooves, the inner (deeper) single-step groove is located on the bottom surface of the outer (shallower) single-step groove. For example, the groove 53 is a stepped groove. During molding, the multi-stage groove can be press-molded step by step along the depth direction of the groove portion 53, and the weakened area 52 is formed at the bottom of the first-stage groove at the deepest position (innermost) within the multi-stage groove.

[0547] The non-weakened region 51 is formed around the groove 53, and the strength of the non-weakened region 51 is greater than the strength of the weakened region 52, making the weakened region 52 more susceptible to breakage than the non-weakened region 51. When the groove 53 is formed in the battery case by pressing, the non-weakened region 51 may be a portion of the battery case that is not pressed. The thickness of the non-weakened region 51 may be uniform or may not be uniform.

[0548] The method for measuring the average grain size can refer to the intercept method in GB6394-2017, and its description will be omitted here. When measuring the average grain size of the weakened region 52, the measurement can be performed along the thickness direction of the weakened region 52. When measuring the average grain size of the non-weakened region 51, the measurement can be performed along the thickness direction of the non-weakened region 51.

[0549] In FIG. 49, the thickness direction of the weakened region 52 and the thickness direction of the non-weakened region 51 are the same, both being in the z direction.

[0550] The inventors further noticed that after the integrated pressure reducing mechanism is formed in the battery case, the mechanical performance of the weak area of ​​the battery case is poor, and under normal use conditions of the battery cell, the weak area is prone to fatigue fracture due to long-term changes in the internal pressure of the battery cell, which will affect the service life of the battery cell.

[0551] Therefore, in some embodiments, when the average crystal grain size of the weakened region 52 is S1 and the average crystal grain size of the non-weakened region 51 is S2, the relationship 0.05≦S1 / S2≦0.9 is satisfied.

[0552] In the embodiment of the present application, the weakened region 52 and the non-weakened region 51 are integrally formed, which has good reliability. Because S1 / S2≦0.9, there is a large difference between the average grain size of the weakened region 52 and the average grain size of the non-weakened region 51. By reducing the average grain size of the weakened region 52, the purpose of finely sizing the grain size of the weakened region 52 is achieved, improving the material mechanical performance of the weakened region 52, and improving the toughness and fatigue strength of the weakened region 52. This reduces the risk of the weakened region 52 breaking under normal use conditions of the battery cell 20, and prolongs the service life of the battery cell 20.

[0553] When S1 / S2<0.05, it is difficult to form the weak area 52, and the strength of the weak area 52 is too great, so that when the battery cell 20 experiences thermal runaway, the weak area 52 is difficult to break, and it is easy for the pressure to not be released immediately.

[0554] Therefore, when S1 / S2≧0.05, the difficulty of forming the weakened region 52 is reduced, and the timeliness of pressure release when the battery cell 20 experiences thermal runaway is improved.

[0555] For example, S1 / S2 may be any one of 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, 0.9, or a range value between any two of them.

[0556] In some embodiments, when 0.1≦S1 / S2≦0.5, the overall performance of the battery case 21 is improved, and the weakened area 52 is guaranteed to be immediately destroyed when the battery cell 20 experiences thermal runaway, while ensuring that the weakened area 52 has sufficient strength under normal usage conditions of the battery cell 20.

[0557] For example, S1 / S2 may be any one 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 value between any two of them.

[0558] In some embodiments, 0.4 μm≦S1≦75 μm.

[0559] S1 may be any one of 0.4 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 28 μm, 30 μm, 35 μm, 36 μm, 40 μm, 45 μm, 49 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 72 μm, 75 μm, or a range value between any two of them.

[0560] The inventors noticed that when S1 > 75 μm, the toughness and fatigue strength of the weak region 52 are low, and when S1 < 0.4 μm, it is difficult to form the weak region 52 and the strength of the weak region 52 is too high, making it difficult for the weak region 52 to break when the battery cell 20 experiences thermal runaway, and making it easy for a situation to occur in which pressure is not released immediately.

[0561] Therefore, when 0.4 μm≦S1≦75 μm, on the one hand, the difficulty of forming the weak region 52 is reduced and the timeliness of pressure release when the battery cell 20 experiences thermal runaway is improved, and on the other hand, the toughness and fatigue resistance strength of the weak region 52 are improved and the risk of the weak region 52 breaking under normal conditions of use of the battery cell 20 is reduced.

[0562] In some embodiments, 1 μm≦S1≦10 μm.

[0563] S1 may be any one of 1 μm, 1.5 μm, 1.6 μm, 2 μm, 2.5 μm, 2.6 μm, 3 μm, 3.5 μm, 3.6 μm, 4 μm, 4.5 μm, 4.6 μm, 5 μm, 5.5 μm, 5.6 μm, 6 μm, 6.5 μm, 6.6 μm, 7 μm, 7.5 μm, 7.6 μm, 8 μm, 8.5 μm, 8.6 μm, 9 μm, 9.5 μm, 9.6 μm, 10 μm, or a range value between any two of them.

[0564] In some embodiments, when 1 μm≦S1≦10 μm, the overall performance of the battery case 21 is improved, and the weakened area 52 is guaranteed to be immediately destroyed when the battery cell 20 experiences thermal runaway, while ensuring that the weakened area 52 has sufficient strength under normal usage conditions of the battery cell 20.

[0565] In some embodiments, 10 μm≦S2≦150 μm.

[0566] S2 may be any one of 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm, or a range value between any two of them.

[0567] Furthermore, 30 μm≦S2≦100 μm.

[0568] S2 may be any one of 30 μm, 32 μm, 35 μm, 37 μm, 40 μm, 42 μm, 45 μm, 47 μm, 50 μm, 52 μm, 55 μm, 57 μm, 60 μm, 62 μm, 65 μm, 67 μm, 70 μm, 72 μm, 75 μm, 77 μm, 80 μm, 82 μm, 85 μm, 87 μm, 90 μm, 92 μm, 95 μm, 97 μm, 100 μm, or a range value between any two of them.

[0569] In some embodiments, the weakened area minimum thickness is A1, and satisfies 1≦A1 / S1≦100.

[0570] A1 / S1 may be any one of 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, or a range value between any two of them.

[0571] When A1 / S1<1, the fewer the number of crystal grain size layers in the weak region 52 in the thickness direction of the weak region 52, the lower the fatigue strength of the weak region 52. When A1 / S1>100, the greater the number of crystal grain size layers in the weak region 52 in the thickness direction of the weak region 52, making the strength of the weak region 52 too high, and increasing the risk that the weak region 52 will not be destroyed immediately when the battery cell 20 experiences thermal runaway.

[0572] Therefore, when 1≦A1 / S1≦100, on the one hand, the weak region 52 has a large grain size layer in the thickness direction, which improves the fatigue strength of the weak region 52 and reduces the risk of the weak region 52 breaking under normal use conditions of the battery cell 20. On the other hand, when the battery cell 20 experiences thermal runaway, the weak region 52 breaks immediately, thereby achieving the purpose of immediately releasing pressure.

[0573] In some embodiments, 5≦A1 / S1≦20.

[0574] A1 / S1 may be any one of 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, or a range value between any two of them.

[0575] In this embodiment, when A1 / S1 is 5≦A1 / S1≦20, the overall performance of the battery case is improved, ensuring that the weak area 52 is immediately destroyed when the battery cell 20 experiences thermal runaway, while also ensuring that the weak area 52 has sufficient fatigue resistance strength under normal conditions of use of the battery cell 20, thereby extending the service life of the battery cell 20.

[0576] In some embodiments, the minimum thickness of the weakened region is A1 and the hardness of the weakened region is B1, and 5 HBW / mm≦B1 / A1≦10,000 HBW / mm is satisfied.

[0577] B1 / A1 may be any one of 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, and 10000HBW / mm, or a range between any two of these.

[0578] The hardness of the weakened region 52 is a Brinell hardness, and its unit is HBW. The Brinell hardness measurement method can be performed by referring to the measurement principle in GB / T23.1-2018. In the actual measurement process, the hardness of the weakened region 52 can be obtained by measuring the inner or outer surface of the weakened region 52 in the thickness direction. For example, if the battery case is the end cover 11 of the battery cell 20, the hardness of the weakened region 52 may be measured on the outer surface of the weakened region 52 away from the inside of the battery cell 20, or the hardness of the weakened region 52 may be measured on the inner surface of the weakened region 52 facing the inside of the battery cell 20.

[0579] When B1 / A1>10,000 HBW / mm, the weak area 52 is thin and has high hardness, which makes the weak area 52 very fragile and prone to breakage under normal use conditions of the battery cell 20, shortening the service life of the battery cell 20. When B1 / A1<5 HBW / mm, the weak area 52 is thick and has low hardness, which causes the weak area 52 to be stretched and stretched when the battery cell 20 experiences thermal runaway, resulting in poor timeliness in pressure release.

[0580] In this embodiment, not only is the influence of the thickness of the weakened region 52 on the performance of the battery case taken into consideration, but also the influence of the hardness of the weakened region 52 on the performance of the battery case. When 5 HBW / mm≦B1 / A1≦10,000 HBW / mm, the weakened region 52 has sufficient strength under normal use conditions of the battery cell 20, and the weakened region 52 is less likely to be damaged by fatigue, thereby extending the service life of the battery cell 20. Furthermore, when the battery cell 20 experiences thermal runaway, the battery case can immediately release pressure through the weakened region 52, reducing the risk of the battery cell 20 exploding and improving the safety of the battery cell 20.

[0581] In some embodiments, 190 HBW / mm≦B1 / A1≦4000 HBW / mm.

[0582] B1 / A1 may be any one of 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 value between any two of them.

[0583] In some embodiments, when 190 HBW / mm≦B1 / A1≦4000 HBW / mm, the overall performance of the battery case is improved, ensuring that the vulnerable area 52 is immediately destroyed when the battery cell 20 experiences thermal runaway, while also ensuring that the vulnerable area 52 has sufficient strength under normal use conditions of the battery cell 20. This extends the service life of the battery cell 20 while ensuring the safety of the battery cell 20.

[0584] In some embodiments, 0.02 mm≦A1≦1.6 mm.

[0585] A1 may be any one of 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, 1.6mm, or a range between any two of them.

[0586] If A1<0.02 mm, it is difficult to form the weakened area 52, and the weakened area 52 is easily damaged during the forming process. If A1>1.6 mm, the weakened area 52 is difficult to break when the battery cell 20 experiences thermal runaway, and it is easy for pressure to not be released immediately.

[0587] Therefore, when 0.02 mm≦A1≦1.6 mm, the difficulty of forming the reduced pressure area 56 of the battery case is reduced, and the timeliness of pressure release when the battery cell 20 experiences thermal runaway is improved.

[0588] In some embodiments, 0.06 mm≦A1≦0.4 mm.

[0589] A1 may be any one of 0.06 mm, 0.07 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, or a range value between any two of them.

[0590] In this embodiment, when 0.06 mm ≤ A1 ≤ 0.4 mm, the difficulty of forming the fragile region 52 is further reduced, and the timeliness of pressure release when the battery cell 20 undergoes thermal runaway is improved.

[0591] In some embodiments, when the hardness of the fragile region is B1 and the hardness of the non-fragile region is B2, 1 < B1 / B2 ≤ 5 is satisfied.

[0592] The hardness of the non-fragile region 51 is Brinell hardness, and the unit is HBW. In the actual measurement process, the hardness of the non-fragile region 51 can be obtained by measuring the inner surface or the outer surface in the thickness direction of the non-fragile region 51. Taking the battery case as the end cover 11 of the battery cell 20 as an example, the hardness of the non-fragile region 51 may be measured on the outer surface of the non-fragile region 51 away from the inside of the battery cell 20, or the hardness of the non-fragile region 51 may be measured on the inner surface of the non-fragile region 51 facing the inside of the battery cell 20.

[0593] In this embodiment, B1 > B2 corresponds to improving the hardness of the fragile region 52, thereby improving the strength of the fragile region 52 and reducing the risk that the fragile region 52 breaks under normal use conditions of the battery cell 20.

[0594] B1 / B2 may be any one of 1.1, 1.5, 2, 2.5, 3, 3.5, 3.6, 4, 4.5, 5, or a range value between any two of them.

[0595] When B1 / B2 > 5, the hardness of the fragile region 52 becomes too high, and there is a possibility that the fragile region 52 is difficult to break even when the battery cell 20 undergoes thermal runaway.

[0596] Therefore, when B1 / B2≦5, the risk that the vulnerable area 52 will not be immediately destroyed when the battery cell 20 experiences thermal runaway is reduced, and the safety of the battery cell 20 is improved.

[0597] In some embodiments, B1 / B2≦2.5.

[0598] B1 / B2 may be any one of 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 value between any two of them.

[0599] In this embodiment, when B1 / B2≦2.5, the risk that the vulnerable region 52 will not be immediately destroyed when the battery cell 20 experiences thermal runaway can be further reduced.

[0600] In some embodiments, 5 HBW≦B2≦150 HBW.

[0601] B2 may be any one of 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, 150HBW, or a range value between any two of them.

[0602] In some embodiments, 5 HBW≦B1≦200 HBW.

[0603] B1 may be any one of 5HBW, 6HBW, 8HBW, 10HBW, 15HBW, 19HBW, 20HBW, 30HBW, 50HBW, 60HBW, 70HBW, 90HBW, 100HBW, 110HBW, 120HBW, 130HBW, 140HBW, 150HBW, 160HBW, 170HBW, 180HBW, 190HBW, 200HBW, or a range value between any two of them.

[0604] 51 and 52, which is a partially enlarged view of a battery case 21 according to another embodiment of the present application. When the minimum thickness of the weakened region 52 is A1 and the minimum thickness of the non-weakened region 51 is A2, the relationship 0.05≦A1 / A2≦0.95 is satisfied.

[0605] The minimum thickness of the weakened region 52 is the thickness of the weakened region 52 at its thinnest point. The minimum thickness of the non-weakened region 51 is the thickness of the non-weakened region 51 at its thinnest point.

[0606] As shown in Figures 51 and 52, the battery case 21 has a first side surface 54 and a second side surface 55 arranged opposite each other, and the groove portion 53 is recessed in a direction from the first side surface 54 toward the second side surface 55, and the portion of the battery case located between the groove bottom surface 531 of the groove portion 53 and the second side surface 55 is a fragile region 52.

[0607] The first side surface 54 and the second side surface 55 may be arranged parallel to each other or at a small angle, and when the first side surface 54 and the second side surface 55 are arranged at a small angle, for example, within 10 degrees, the minimum distance between the first side surface 54 and the second side surface 55 is the minimum thickness of the non-weakened region 51. As shown in Figures 51 and 52, when the first side surface 54 and the second side surface 55 are parallel to each other, the distance between the first side surface 54 and the second side surface 55 is the minimum thickness of the non-weakened region 51.

[0608] The groove bottom surface 531 of the groove portion 53 may be flat or curved. If the groove bottom surface 531 of the groove portion 53 is flat, the groove bottom surface 531 of the groove portion 53 may be parallel to the second side surface 55 or may be disposed at a small angle. If the groove bottom surface 531 of the groove portion 53 and the second side surface 55 are disposed at a small angle, for example, an angle of 10 degrees or less, the minimum distance between the groove bottom surface 531 of the groove portion 53 and the second side surface 55 is the minimum thickness of the weakened region 52. As shown in FIG. 51 , if the groove bottom surface 531 of the groove portion 53 and the second side surface 55 are parallel, the distance between the groove bottom surface 531 of the groove portion 53 and the second side surface 55 is the minimum thickness of the weakened region 52. As shown in Figure 52, when the groove bottom surface 531 of the groove portion is a curved surface, for example, when the groove bottom surface 531 of the groove portion 53 is an arc surface, the minimum distance between the groove bottom surface 531 of the groove portion 53 and the second side surface 55 is the minimum thickness of the weak area 52.

[0609] A1 / A2 may be any one of 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, 0.95, or a range value between any two of them.

[0610] When A1 / A2<0.05, the strength of the weakened region 52 may be insufficient. When A1 / A2>0.95, the weakened region 52 may be difficult to break even if the battery cell 20 experiences thermal runaway, and if the pressure is not released immediately, it may cause the battery cell 20 to explode. Therefore, when 0.05≦A1 / A2≦0.95, not only does the weakened region 52 reduce the probability of rupture under normal use conditions of the battery cell 20, but it also reduces the probability of an explosion occurring when the battery cell 20 experiences thermal runaway.

[0611] In some embodiments, 0.12≦A1 / A2≦0.8.

[0612] A1 / A2 may be any one of 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, or a range value between any two of them.

[0613] In some embodiments, when A1 / A2 is 0.12≦A1 / A2≦0.8, the overall performance of the external component is improved, and the weakened region 52 is guaranteed to have sufficient strength under normal use conditions of the battery cell 20 while ensuring that the weakened region 52 is immediately destroyed when the battery cell 20 experiences thermal runaway. When the groove 53 is formed by pressing, S1 / S2≦0.5 can be easily achieved by controlling A1 / A2 to be between 0.12 and 0.8, thereby achieving the objective of minimizing the crystal grain size of the weakened region 52.

[0614] In some embodiments, 0.2≦A1 / A2≦0.5.

[0615] A1 / A2 may be any one of 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, or a range value between any two of them.

[0616] In this embodiment, A1 / A2 is controlled to be between 0.2 and 0.5, and the reinforcing effect on the weak region 52 by reducing the crystal grain size is superior to the weakening effect on the weak region 52 by reducing the thickness, so that the weak region 52 has better fatigue resistance, further reducing the risk of the weak region 52 breaking under normal use conditions of the battery cell 20, and ensuring that the weak region 52 breaks immediately when the battery cell 20 experiences thermal runaway, thereby improving the timeliness of pressure release.

[0617] In some embodiments, 0.02 mm≦A1≦1.6 mm. Further, 0.06 mm≦A1≦0.4 mm.

[0618] In some embodiments, 1 mm≦A2≦5 mm, and A2 may be any one of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or a range value between any two of them.

[0619] When A2>5mm, the thickness of the non-weakened region 51 is large, the battery case requires more material, the battery case is heavy, and the cost efficiency is poor. When A2<1mm, the thickness of the non-weakened region 51 is small, and the battery case has low deformation resistance. Therefore, when 1mm≦A2≦5mm, the battery case has good cost efficiency and good deformation resistance.

[0620] Furthermore, 1.2 mm≦A2≦3.5 mm.

[0621] A2 may be any one of 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 value between any two of them.

[0622] In this embodiment, when A2 is 1.2 mm≦A2≦3.5 mm, the battery case has good economic efficiency and deformation resistance, and further, A2 is 2 mm≦A2≦3 mm.

[0623] In some embodiments, reference is made to FIG. 53 , which is a structural schematic diagram of a battery case 21 according to another embodiment of the present application (showing a one-stage shallow groove 532). FIG. 54 is an E-E cross-sectional view of the battery case 21 shown in FIG. 53 . FIG. 55 is a structural schematic diagram of a battery case 21 according to another embodiment of the present application (showing a one-stage shallow groove 532). FIG. 56 is an F-F cross-sectional view of the battery case shown in FIG. 55 . FIG. 57 is a structural schematic diagram of a battery case according to another embodiment of the present application (showing a one-stage shallow groove 532). FIG. 58 is a G-G cross-sectional view of the battery case shown in FIG. 53 . The battery case 21 has a reduced pressure region 56, and the groove portion 53 includes a one-stage shallow groove 532. The shallow groove 532 is disposed along the edge of the reduced pressure region 56, and the reduced pressure region 56 is arranged so as to be openable at the shallow groove 532 as a boundary, and the weakened region 52 is formed at the bottom of the shallow groove 532.

[0624] The decompression region 56 is a region of the battery case that can be opened after the weak region 52 is broken. For example, when the internal pressure of the battery cell 20 reaches a threshold, the weak region 52 ruptures, and the decompression region 56 is opened to the outside under the action of the discharged matter inside the battery cell 20. When the decompression region 56 is opened, the battery case can form an exhaust port at a position corresponding to the decompression region 56, and the discharged matter inside the battery cell 20 can be discharged through the exhaust port, thereby releasing the pressure inside the battery cell 20.

[0625] The shallow groove 532 may be formed in the battery case by press molding. The shallow groove 532 in the groove portion 53 has only one stage, and the one-stage shallow groove 532 can be formed by a single press. The shallow groove 532 may have various shapes, such as an annular groove, an arc-shaped groove, a U-shaped groove, or an H-shaped groove. The weakened region 52 is formed at the bottom of the shallow groove 532, and the shape of the weakened region 52 is the same as the shape of the shallow groove 532. For example, if the weakened region 52 is a U-shaped groove, the weakened region 52 extends along the locus of the U-shape.

[0626] In this embodiment, the weakened area 52 is formed at the bottom of the shallow groove 532. When the weakened area 52 is broken, the pressure-reducing area 56 can be opened with the weakened area 52 as a boundary, thereby realizing pressure release and increasing the pressure release area of ​​the battery case.

[0627] In some embodiments, with continued reference to Figures 54, 56, and 58, the battery case 21 has a first side 54 and a second side 55 disposed opposite each other, and the shallow groove 532 is recessed from the first side 54 in a direction adjacent to the second side 55.

[0628] The first side surface 54 may be an inner surface of the battery case 21 facing the inside of the battery cells 20, and the second side surface 55 may be an outer surface of the battery case away from the inside of the battery cells 20. Alternatively, the first side surface 54 may be an outer surface of the battery case away from the inside of the battery cells 20, and the second side surface 55 may be an inner surface of the battery case facing the inside of the battery cells 20. Illustratively, the first side surface 54 is parallel to the second side surface 55, and the minimum thickness of the non-weakened region 51 is the distance between the first side surface 54 and the second side surface 55.

[0629] The groove bottom surface of shallow groove 532 is groove bottom surface 531 of the groove portion. The portion of battery case 21 between the groove bottom surface of shallow groove 532 and second side surface 55 is the groove bottom wall of shallow groove 532, and the groove bottom wall of shallow groove 532 is weakened region 52.

[0630] In this embodiment, the groove portion 53 only includes a one-stage shallow groove 532, and the shallow groove 532 is the groove portion 53, which is a one-stage groove, and the structure is simple. The shallow groove 532 can be formed on the first side surface 54 during molding, which simplifies molding, improves production efficiency, and reduces production costs.

[0631] 59 to 64, in some embodiments, FIG. 59 is a structural schematic diagram of a battery case 21 according to another embodiment of the present application (showing a two-stage shallow groove 532). FIG. 60 is a K-K cross-sectional view of the battery case 21 shown in FIG. 59. FIG. 61 is a structural schematic diagram of a battery case according to another embodiment of the present application (showing a two-stage shallow groove 532). FIG. 62 is an M-M cross-sectional view of the battery case shown in FIG. 61. FIG. 63 is a structural schematic diagram of a battery case according to another embodiment of the present application (showing a two-stage shallow groove 532). FIG. 64 is an N-N cross-sectional view of the battery case shown in FIG. 63. The battery case 21 includes a first side surface 54 and a second side surface 55 disposed opposite each other, and the groove portion 53 includes a multi-stage shallow groove 532. The multi-stage shallow groove 532 is disposed on the battery case in order from the first side surface 54 to the second side surface 55, and the weakened region 52 is formed at the bottom of the one-stage shallow groove 532 furthest from the first side surface 54. The battery case has ...

Claims

1. A housing and a battery cell, A battery, comprising: an accommodation cavity provided within the housing, the accommodation cavity including a ceiling wall and a bottom wall arranged opposite each other in a vertical direction; the battery cell provided within the accommodation 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 fixed within the accommodation cavity, and the electrode terminal arranged to face the bottom wall of the accommodation cavity.

2. 2. The battery of claim 1, wherein the battery cell has a first wall and a second wall connected to each other, the first wall being the wall with the largest area in the battery cell, and the second wall being disposed across the first wall.

3. The battery according to claim 2 , wherein the electrode terminal is disposed on the first wall.

4. 4. The battery of claim 3, wherein the battery cells are arranged in a first direction, each of the battery cells has a first surface arranged opposite the first wall in the first direction, the first surface has an escape groove, the escape groove of one of two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

5. The battery according to claim 2 , wherein the electrode terminal is disposed on the second wall.

6. 6. The battery of claim 5, wherein the battery cell includes two of the first walls disposed opposite to each other and two of the second walls disposed opposite to each other, and at least two of the electrode terminals are disposed on the same second wall, or at least one of the electrode terminals is disposed on each of the second walls.

7. The battery of claim 2 , wherein the first wall is cylindrically formed.

8. The battery according to claim 7 , wherein the second walls are provided at both axial ends of the first wall, and the electrode terminal is provided on at least one of the second walls.

9. 9. The battery of claim 8, wherein one of the second walls is provided with the exposed electrode terminal, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet, one of the positive electrode sheet and the negative electrode sheet being electrically connected to the electrode terminal, and the other of the positive electrode sheet and the negative electrode sheet being electrically connected to the first wall or the other of the second walls.

10. 10. The battery of claim 1, wherein at least one of the battery cells is a soft-pack battery cell.

11. The battery according to any one of claims 1 to 10, wherein the battery cell further includes a pressure reducing mechanism, and the pressure reducing mechanism and the electrode terminal are installed on the same wall of the battery cell.

12. The battery according to any one of claims 1 to 10, wherein the battery cell further includes a pressure reducing mechanism, and the pressure reducing mechanism and the electrode terminal are respectively installed on two walls of the battery cell.

13. The battery according to any one of claims 1 to 12, wherein the housing includes a main body and a bottom cover installed on the bottom of the main body, the bottom cover and the main body being hermetically connected and together forming the sealed storage cavity.

14. The battery of claim 13 , wherein a wall of the bottom cover facing the battery cell constitutes the bottom wall of the receiving cavity.

15. The battery of claim 13 or 14, wherein the bottom cover is removably connected to the bottom of the body.

16. The battery according to any one of claims 13 to 15, wherein the bottom cover has a characteristic surface facing the receiving cavity, the characteristic surface being configured as a flat surface.

17. The battery according to any one of claims 1 to 16, wherein a mounting member is provided on an upper portion of the housing, and the battery cells are provided on a surface of the mounting member.

18. The battery according to claim 17 , wherein a wall of the mounting member facing the battery cell constitutes the ceiling wall of the storage cavity.

19. 19. The battery according to claim 17 or 18, wherein the minimum thickness H of the mounting member and the weight M1 of the battery satisfy 0.0002 mm / kg<H / M1≦0.2 mm / kg.

20. The battery according to any one of claims 17 to 19, wherein the mounting member is used to define the accommodating cavity, and the battery cells are suspended from the mounting member.

21. The battery of claim 20 , wherein the battery cell is adhered to the mounting member.

22. The battery according to any one of claims 17 to 21, wherein an outer surface of the battery cell facing the mounting member is a first outer surface, and the electrode terminal is disposed on an outer surface of the battery cell other than the first outer surface.

23. The battery of claim 22 , wherein the battery cell has a second outer surface disposed opposite the first outer surface, and the electrode terminal is disposed on the second outer surface.

24. The battery of any one of claims 17 to 23, wherein the battery cell is multiple, the multiple battery cells are arranged and installed in a second direction, the second direction is perpendicular to the vertical direction, the mounting member is connected to a ceiling wall of the multiple battery cells, the battery cells are located below the mounting member, and a relationship between a dimension N of the mounting member in the vertical direction and a weight M2 of the battery cells satisfies 0.04 mm / kg≦N / M2≦100 mm / kg.

25. The battery of claim 24 , wherein a cavity is located within the mounting member.

26. 25. The battery of claim 24, wherein the cavity is adapted to accommodate a heat exchange medium for regulating a temperature of the battery cell.

27. The battery according to any one of claims 17 to 26, wherein a reinforcing rib is provided on a surface of the mounting member remote from the battery cell in the vertical direction.

28. The battery according to any one of claims 17 to 27, wherein the mounting member has a mounting surface facing the accommodating cavity, the mounting surface being configured as a flat surface.

29. The battery described in claim 28, wherein the mounting member has a mounting portion and a connection portion, the connection portion is connected around an edge of the mounting portion, the mounting portion is used to define the accommodating cavity, and the connection portion is connected to a portion of the housing other than the mounting member, wherein an inner surface structure of the mounting portion facing the accommodating cavity forms the mounting surface.

30. The battery according to claim 29 , wherein the mounting portion is disposed so as to protrude from the connection portion in a direction away from the accommodating cavity.

31. The battery of any one of claims 17 to 30, wherein the housing includes a bottom cover and a frame, the frame surrounds and forms an enclosed space that is installed to penetrate both ends in the vertical direction, the bottom cover and the mounting member respectively cover opposite ends in the vertical direction of the enclosed space, and the storage cavity is formed surrounded by the bottom cover, the frame and the mounting member.

32. The battery according to any one of claims 1 to 31, wherein the battery cells are inverted within the housing in a manner such that an end cover faces the bottom wall, a pressure reducing mechanism and the electrode terminals are provided on the end cover, and both the pressure reducing mechanism and the electrode terminals are provided facing the bottom wall.

33. Further comprising a connection plate and a connector; The battery described in any one of claims 1 to 32, wherein the connection plate is installed protruding horizontally from one side of the housing, the connection plate and the bottom wall form a storage section in the vertical direction, the connector is installed in the storage section and connected to the connection plate, and the connector is electrically connected to the battery cell.

34. Further comprising a protection assembly; The battery of any one of claims 1 to 33, wherein the protection assembly is disposed between the battery cells and the bottom wall, thereby supporting and mounting the battery cells.

35. Further comprising a bus member; 35. The battery of claim 34, wherein the bus member is used to electrically connect to the electrode terminals of at least two of the battery cells, the protection assembly is installed between the bottom wall and the bus member, and the protection assembly is installed to insulate the battery cells and the bottom wall.

36. 36. The battery of claim 34 or 35, wherein the protective assembly includes a protective strip, the protective strip abutting the battery cell.

37. 37. The battery of claim 36, wherein the protective strip is fixedly connected to the battery cells and / or the housing.

38. 38. The battery of claim 37, wherein the protective strip is adhered to the battery cell and / or the housing.

39. The battery of any one of claims 36 to 38, wherein the protective strip is provided in a plurality of locations, the plurality of protective strips are spaced apart in a second direction, and extend along a first direction, the first direction, the second direction, and the vertical direction being respectively perpendicular to each other.

40. The battery of any one of claims 36 to 39, wherein the protective assembly further includes a main plate, the protective strip being connected to the main plate, and the main plate being located between the protective strip and the bottom wall.

41. 41. The battery of claim 40, wherein the main plate abuts the bottom wall.

42. 42. The battery of claim 41, wherein the main plate is fixedly connected to the bottom wall.

43. The battery of any one of claims 40 to 42, wherein the main plate and the protective strip are integrally formed or removably connected.

44. The battery of any one of claims 36 to 43, wherein the end cover of the battery cell includes a functional area and a shoulder portion, the electrode terminal is installed in the functional area, the shoulder portions are located on both sides of the functional area along a second direction, the battery cell abuts against the protective strip via the shoulder portions, and the second direction is perpendicular to the vertical direction.

45. The battery according to any one of claims 36 to 44, wherein in the vertical direction, a thickness of the protective strip is greater than an extended height of a portion of the electrode terminal exposed from the battery cell.

46. The battery according to any one of claims 36 to 45, wherein the protective strip abuts against the electrode terminal, or the protective strip and the electrode terminal are spaced apart from each other.

47. The battery according to any one of claims 39 to 46, wherein an orthogonal projection on the bottom wall of the electrode terminal is located between orthogonal projections on the bottom wall of adjacent protective strips.

48. The battery according to any one of claims 39 to 47, wherein the electrode terminals of two adjacent battery cells are electrically connected via a bus member, and an extension length of one of the two adjacent protective strips in the second direction is shorter than an extension length of the other of the two adjacent protective strips, thereby forming a relief notch, and the relief notch is used to allow the bus member to escape.

49. The battery of any one of claims 39 to 48, wherein the battery cell further includes a pressure reducing mechanism, the pressure reducing mechanism is installed on the same side as the electrode terminal, and an orthogonal projection of the pressure reducing mechanism on the bottom wall is located between orthogonal projections of adjacent protective strips on the bottom walls.

50. The battery of any one of claims 32 to 49, wherein in the vertical direction, there is a first distance H1 between the end cover and the bottom wall of the battery cell, and the first distance H1 satisfies 2 mm < H1 < 30 mm.

51. The battery of claim 50, wherein a ratio H1 / M2 of the first distance H1 to a weight M2 of a single battery cell satisfies 0.2 mm / Kg<H1 / M2<50 mm / Kg.

52. The battery cell further includes a battery case, the electrode assembly is housed in the battery case, a pressure reducing mechanism is installed in the battery case, and the pressure reducing mechanism is integrally molded with the battery case. The battery of any one of claims 1 to 51.

53. 53. The battery of claim 52, wherein the battery case includes an integrally molded non-weakened area and a weak area, a groove is provided in the battery case, the non-weakened area is formed around the groove, and the weak area is formed at the bottom of the groove, the weak area is positioned to break when the battery cell releases internal pressure, and the pressure reduction mechanism includes the weak area.

54. The average crystal grain size of the weak region is S １ The average crystal grain size of the non-weakened region is S ２ In this case, 0.05≦S １ / S ２ 54. The battery of claim 53, wherein the battery satisfies ≦0.

9.

55. The minimum thickness of the weakened area is A １ In this case, 1≦A １ / S １ 55. The battery of claim 54, wherein:

56. The minimum thickness of the weakened area is A １ , the hardness of the weakened area is B １ In this case, 5HBW / mm≦B １ / A １ The battery according to any one of claims 53 to 55, which satisfies ≦10000 HBW / mm.

57. Hardness B of the weakened area １ , the hardness B of the non-weakened region ２ , 1 < B １ / B ２ The battery according to any one of claims 53 to 56, wherein ≦5 is satisfied.

58. The minimum thickness of the weakened area is A １ , the minimum thickness of the non-weakened region is A ２ In this case, 0.05≦A １ / A ２ The battery according to any one of claims 53 to 57, wherein the battery satisfies ≦0.

95.

59. 59. The battery of claim 1, wherein the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer, the current collector includes a support layer and a conductive layer, the support layer is used to support the conductive layer, and the conductive layer is used to support the active material layer.

60. 60. The battery of claim 59, wherein the conductive layer is disposed on at least one side of the support layer along a thickness direction of the support layer.

61. The surface resistance R of the conductive layer at room temperature Ｓ 0.016Ω / □≦R Ｓ The battery of claim 59 or 60, having a resistance of ≦420 Ω / □.

62. 62. The battery of any one of claims 59 to 61, wherein the material of the conductive layer is selected from at least one of aluminum, copper, titanium, silver, nickel-copper alloys, and aluminum-zirconium alloys.

63. 63. The battery of any one of claims 59 to 62, wherein the material of the support layer comprises one or more of a polymeric material and a polymer-based composite material.

64. The thickness d1 of the support layer and the light transmittance k of the support layer are In the case of 12 μm≦d1≦30 μm, 30%≦k≦80% is satisfied, or In the case where 8 μm≦d1<12 μm, 40%≦k≦90% is satisfied, or The battery according to any one of claims 59 to 63, wherein 50% ≦ k ≦ 98% is satisfied when 1 μm ≦ d1 < 8 μm.

65. The electrode assembly includes a positive electrode sheet, the positive electrode sheet including a positive electrode current collector and a positive electrode active material layer coated on a surface of the positive electrode current collector, the positive electrode active material layer including a positive electrode active material, the positive electrode active material having a core and a shell covering the core, the core being a ternary material, dLi ２ MnO ３ ・(1-d) LiMO ２ and LiMPO ４ wherein 0<d<1, M comprises one or more selected from Fe, Ni, Co, and Mn, the shell comprises a crystalline inorganic material, the crystalline inorganic material has a half width of a main peak measured by X-ray diffraction of 0 to 3°, and the crystalline inorganic material comprises one or more of a metal oxide and an inorganic salt.

66. 66. The battery of claim 65, wherein the shell comprises at least one of the metal oxide and the inorganic salt and carbon.

67. The electrode assembly includes a positive electrode sheet, the positive electrode sheet including a positive electrode current collector and a positive electrode active material layer coated on a surface of the positive electrode current collector, the positive electrode active material layer including a positive electrode active material, and the positive electrode active material is LiMPO ４ wherein M includes Mn and a non-Mn element, and the non-Mn element is Condition 1, where a is the ionic radius of the non-Mn element and b is the ionic radius of the manganese element, |a-b| / b is 10% or less; Condition 2, where U is a valence change voltage of the non-Mn element, satisfies 2V<U<5.5V; Condition 3: the chemical activity of the chemical bond formed by the non-Mn element and O is equal to or higher than the chemical activity of a P—O bond; The battery according to any one of claims 1 to 66, satisfying at least one of condition 4, in which the highest value number of the non-Mn element is 6 or less.

68. 68. The battery of claim 67, wherein the non-Mn elements include one or both of a first doping element and a second doping element, the first doping element being a manganese site dopant and the second doping element being a phosphosite dopant.

69. The first doping element is Condition 1: where the ionic radius of the first doping element is a and the ionic radius of the manganese element is b, |a-b| / b is 10% or less; 69. The battery of claim 68, wherein at least one of the conditions 2 is satisfied, where U is a valence change voltage of the first doping element, 2V<U<5.5V.

70. The second doping element is Condition 1, the chemical activity of the chemical bond formed by the second doping element and O is equal to or higher than the chemical activity of the P-O bond; 69. The battery of claim 68, satisfying at least one of the conditions 2, wherein the highest doping charge of the second doping element is 6 or less.

71. The battery according to any one of claims 67 to 70, wherein the positive electrode active material further has a coating layer.

72. 72. The battery of claim 71, wherein the coating layer comprises carbon.

73. The carbon in the coating layer is SP ２ Forms of carbon and SP ３ 73. The battery of claim 72, wherein the carbon is in the form of a mixture with carbon.

74. The SP ２ Forms of carbon and SP ３ 74. The battery of claim 73, wherein the molar ratio of the carbon in the form of is any value in the range of 0.1 to 10.

75. 75. A power consuming device comprising a battery according to any preceding claim for supplying electrical energy thereto.

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