Batteries and power consumption 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 consumption devices.

[0002] Cross-reference of related applications This application is related to the following international patent applications: application number PCT / CN2022 / 098355, filed on June 13, 2022; application number PCT / CN2022 / 077998, filed on February 25, 2022; application number PCT / CN2022 / 098380, filed on June 13, 2022; and application number PCT / CN2022 / 098343. 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 This application is filed pursuant to International Patent Application No. CT / CN2022 / 077993, filed on 25 February 2022; International Patent Application No. PCT / CN2022 / 101440, filed on 27 June 2022; International Patent Application No. PCT / CN2022 / 101406, filed on 27 June 2022; International Patent Application No. PCT / CN2022 / 101414, filed on 27 June 2022; International Patent Application No. PCT / CN2022 / 101517, filed on 27 June 2022; and International Patent Application No. PCT / CN2022 / 101393, filed on 27 June 2022, claiming priority to the above International Patent Applications, and the entire contents of the above International Patent Applications are incorporated into this Application by reference. [Background technology]

[0003] In recent years, the emergence of new energy vehicles has played a significant role in both social development and environmental protection. Rechargeable batteries serve as the power source for new energy vehicles and are widely applied 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 consumption device. Furthermore, conventional batteries have low rigidity and cannot directly withstand the load from other parts of the power consumption device, making them prone to safety accidents and potentially affecting the safety of the power consumption device. [Overview of the project]

[0005] The object of this application is to solve at least one technical problem present in related technologies. To this end, this application provides a battery that can improve the energy density and safety of the battery.

[0006] The present invention further provides a power consumption device having the above-mentioned battery.

[0007] A battery according to an embodiment of the first aspect of the present application comprises a housing and a battery cell, wherein a housing cavity is provided within the housing, the housing cavity includes a top wall and a bottom wall installed facing each other in the vertical direction, the battery cell is provided within the housing cavity, the battery cell includes an electrode assembly and electrode terminals, the electrode assembly is electrically connected to the electrode terminals, the battery cell is fixed within the housing cavity, and the electrode terminals are positioned to face the bottom wall of the housing cavity.

[0008] In the above technical solution, the safety of the battery can be improved by installing the battery cell inside the housing and positioning the electrode terminals facing the bottom wall.

[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 intersecting the second wall.

[0010] In some embodiments, the electrode terminals are provided on the first wall.

[0011] In some embodiments, the battery cells are multiple and arranged in a first direction, and in the first direction, each battery cell is provided with a first surface that is positioned opposite the first wall, and the first surface is provided with a relief groove, and the relief groove of one of two adjacent battery cells is used to accommodate the electrode terminals of the other battery cell, and the first direction is perpendicular to the first wall.

[0012] In some embodiments, the electrode terminals are installed on the second wall.

[0013] In some embodiments, the battery cell includes two opposing first walls and two opposing second walls, and at least two electrode terminals are provided, with at least two electrode terminals on the same second wall, or at least one electrode terminal on each second wall.

[0014] In some embodiments, the first wall is formed in a cylindrical shape.

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

[0016] In some embodiments, an exposed electrode terminal is provided 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 softpack battery cell.

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

[0019] In some embodiments, the battery cell further includes a pressure reduction mechanism, and the pressure reduction 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 by the placement member.

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

[0029] In some embodiments, the outer surface of the battery cell facing the aforementioned mounting member is the first outer surface, and the electrode terminals are arranged 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 located opposite the first outer surface, and the electrode terminals are arranged on the second outer surface.

[0031] In some embodiments, there are multiple battery cells, which are arranged and installed in a second direction, the second direction being perpendicular to the vertical direction, the mounting member is connected to the ceiling wall of the multiple battery cells, the battery cells are located below the mounting member, and the relationship between the vertical dimension N of the mounting member 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 installed inside the aforementioned mounting member.

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

[0034] In some embodiments, reinforcing ribs are provided on the surface of the mounting member that is away from the battery cell in the vertical direction.

[0035] In some embodiments, the aforementioned mounting member has a mounting surface that faces the housing cavity, and the aforementioned mounting surface is configured as a flat surface.

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

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

[0038] In some embodiments, the housing includes a bottom cover and a frame, the frame forming a confined space that is installed penetrating both vertical ends, the bottom cover and the aforementioned mounting member each cover the opposing vertical ends of the confined space, and the housing cavity is formed enclosed by the bottom cover, the frame and the aforementioned mounting member.

[0039] In some embodiments, the battery cell is placed inverted within the housing such that its end cover faces the bottom wall, and the pressure reducing mechanism and electrode terminals are installed on the end cover, with both the pressure reducing mechanism and electrode terminals facing the bottom wall.

[0040] In some embodiments, the battery further includes a connecting plate and a connector, the connecting plate being installed protruding horizontally from one side of the housing, the connecting plate and the bottom wall forming a storage compartment in the vertical direction, the connector being installed within the storage compartment and connected to the connecting plate, and the connector being electrically connected to the battery cell.

[0041] In some embodiments, the battery further includes a protective assembly, which is installed between the battery cell and the bottom wall, thereby supporting and supporting the battery cell.

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

[0043] In some embodiments, the protective assembly includes a protective strip, the protective strip contacting 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 bonded to the battery cell and / or the housing.

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

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

[0048] In some embodiments, the main plate abuts against 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 molded with or detachably 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 terminals are installed in the functional area, the shoulder portion is located on both sides of the functional area along a second direction, the battery cell abuts the protective strip via the shoulder portion, and the second direction is perpendicular to the vertical direction.

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

[0053] In some embodiments, the protective strip is in contact with the electrode terminal, or the protective strip and the electrode terminal are spaced apart.

[0054] In some embodiments, the orthographic projection of the electrode terminal on the bottom wall is located between the orthographic projections of the adjacent protective strip on the bottom wall.

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

[0056] In some embodiments, the battery cell further includes a pressure reduction mechanism, the pressure reduction mechanism is located on the same side as the electrode terminals, and the orthographic projection of the pressure reduction mechanism on the bottom wall is located between the orthographic projections on the bottom wall of the adjacent protective strip.

[0057] In some embodiments, 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 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 housed within 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.

[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 provided on at least one side of the support layer.

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

[0073] , ,

[0072] , , ,

[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 ternary materials, dLi2MnO3·(1 - d)LiMO2 and LiMPO4, 0 < d < 1, M includes one or more selected from Fe, Ni, Co, 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 - 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 a non-Mn element, and the non-Mn element satisfies 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 charging and discharging 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 form carbon and SP3 form carbon.

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

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

[0083] Other aspects and advantages of the present application are, in part, described below, become apparent from the following description, or are understood by practicing the present application. [Brief explanation of the drawing]

[0084] The above and / or other aspects and advantages of the present application will become apparent and readily apparent from the description of the embodiments with reference to the following drawings.

[0085] [Figure 1] This is a schematic diagram of a power consumption device according to one embodiment of the present invention. [Figure 2] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 3] This is an exploded view of a battery according to another embodiment of the present invention. [Figure 4] This is an exploded view of a battery cell according to one embodiment of the present invention. [Figure 5] Figure 4 is a schematic diagram of the battery cell. [Figure 6] This is a schematic diagram of the arrangement of battery cells according to another embodiment of the present invention. [Figure 7] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 8] Figure 7 is a schematic diagram of the battery cell arrangement. [Figure 9] This is a schematic diagram of a battery cell according to one embodiment of the present invention. [Figure 10] This is a schematic diagram of the structure of a battery according to several embodiments of the present invention. [Figure 11] Figure 10 is an exploded view of the battery. [Figure 12] This is a schematic diagram of the structure of a bottom cover according to several embodiments of the present invention. [Figure 13] Figure 12 is a plan view of the bottom cover. [Figure 14] Figure 12 is a front view of the bottom cover. [Figure 15] This is a schematic diagram of the structure of a bottom cover according to another embodiment of the present invention. [Figure 16] Figure 10 is an exploded view of the battery. [Figure 17] Figure 14 is a schematic orthographic projection of the bottom cover in the vertical direction. [Figure 18] This is a schematic diagram of the external shape of a battery cell according to several embodiments of the present invention. [Figure 19] Figure 18 is a front view of the battery cell. [Figure 20] This is a schematic diagram of the structure of the mounting member in some embodiments of the present application. [Figure 21] This is a schematic diagram of the structure of a mounting member in another embodiment of the present application. [Figure 22] Figure 21 is a vertical orthographic projection of the mounting member shown. [Figure 23] Figure 10 is a front view of the battery. [Figure 24] This is a schematic diagram showing how batteries in some embodiments of the present invention are applied to the body. [Figure 25] Figure 24 is a schematic diagram of the battery. [Figure 26] This is the first exploded state diagram of the structure shown in Figure 24. [Figure 27] This is the second exploded state diagram of the structure shown in Figure 24. [Figure 28] This is a schematic diagram showing the relationship between the battery and the body in some embodiments of the present invention. [Figure 29] This is a schematic diagram of a battery according to some embodiments of the present invention. [Figure 30] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 31] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 32] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 33] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 34] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 35] This is a schematic diagram of the structure of a battery according to several embodiments of the present invention. [Figure 36] This is a schematic diagram of the structure of a battery according to one embodiment of the present invention. [Figure 37] Figure 36 is a schematic diagram of the battery module. [Figure 38] This is a schematic diagram showing a battery cell and a heat conductive member fitted together according to several embodiments of the present application. [Figure 39] This is a schematic diagram showing a battery cell and a heat conductive member fitted together according to several embodiments of the present application. [Figure 40] This is a schematic diagram showing a battery cell and a heat conductive member fitted together according to several embodiments of the present application. [Figure 41] This is an exploded view of a battery according to some embodiments of the present invention. [Figure 42] Figure 41 is a schematic diagram of the structure of the battery protection assembly. [Figure 43] Figure 41 is a schematic cross-sectional view of the battery. [Figure 44] This is a magnified schematic diagram of area B, enclosed by a circle in Figure 43. [Figure 45] This is a schematic diagram of the structure of a collision test apparatus A for performing collision tests on batteries according to some embodiments of the present invention. [Figure 46] This is a schematic diagram showing the arrangement of electrode terminals according to some embodiments of the present application. [Figure 47] This is a schematic diagram showing a battery cell and a heat conductive member fitted together according to several embodiments of the present application. [Figure 48] This is a schematic diagram of the structure of the outer case according to several embodiments of the present application. [Figure 49]Figure 48 is a cross-sectional view of the outer case (CC). [Figure 50] Figure 49 shows the grain size diagram (schematic diagram) of the outer case. [Figure 51] Figure 49 is a magnified view of section E of the outer case. [Figure 52] This is a partially enlarged view of an external case relating to another implementation of the present application. [Figure 53] This is a schematic diagram of the outer case structure according to several embodiments of the present application (showing a single shallow groove). [Figure 54] Figure 53 is a cross-sectional view of the outer casing's EE (Earth End). [Figure 55] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove). [Figure 56] Figure 55 is a cross-sectional view of the outer casing of the FF. [Figure 57] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove). [Figure 58] Figure 57 is a cross-sectional view of the outer casing GG. [Figure 59] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing the second shallow groove). [Figure 60] Figure 59 is a cross-sectional view of the outer casing KK. [Figure 61] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing the second shallow groove). [Figure 62] Figure 61 is a cross-sectional view of the outer casing (MM). [Figure 63] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing the second shallow groove). [Figure 64] Figure 63 is a cross-sectional view of the outer case at NN. [Figure 65] These are axial measurements of the outer casing according to several embodiments of the present application. [Figure 66] Figure 65 is a schematic diagram of the outer casing structure (showing a single shallow groove and a single counterbore groove). [Figure 67] Figure 66 is a cross-sectional view of the outer case. [Figure 68] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove and a single counterbore groove). [Figure 69] Figure 68 is a cross-sectional view of the PP outer casing. [Figure 70] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove and a single counterbore groove). [Figure 71] Figure 70 shows a cross-sectional view of the outer casing at QQ. [Figure 72] This is a schematic diagram of the outer case structure according to several embodiments of the present application (showing a single shallow groove and a second counterbore groove). [Figure 73] Figure 72 is a cross-sectional view of the outer casing (RR). [Figure 74] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove and a second counterbore groove). [Figure 75] Figure 74 is a cross-sectional view of the outer casing (SS). [Figure 76] This is a schematic diagram of the structure of an outer case member according to several embodiments of the present invention (showing a single shallow groove and a double counterbore groove). [Figure 77] Figure 76 is a cross-sectional view of the outer casing TT. [Figure 78] This is a schematic diagram of the structure of the outer case according to another embodiment of the present application. [Figure 79] This is a schematic diagram of the crystal grain size of the outer case according to another embodiment of the present application. [Figure 80] This is a schematic diagram of the structure of an end cover according to several embodiments of the present invention. [Figure 81] This is a schematic diagram of the structure of a housing according to several embodiments of the present invention. [Figure 82] This is a schematic diagram of the structure of a housing according to another embodiment of the present invention. [Figure 83] This is a schematic diagram of the structure of a battery cell according to several embodiments of the present invention. [Figure 84] This is a schematic diagram of the structure of a positive electrode current collector according to a specific embodiment of the present invention. [Figure 85]This is a schematic diagram of the structure of a positive electrode current collector according to another specific embodiment of the present application. [Figure 86] This is a schematic diagram of the structure of a negative electrode current collector according to a specific embodiment of the present invention. [Figure 87] This is a schematic diagram of the structure of a negative electrode current collector according to another specific embodiment of the present application. [Figure 88] This is a schematic diagram of the structure of a positive electrode sheet according to a specific embodiment of the present invention. [Figure 89] This is a schematic diagram of the structure of a positive electrode sheet according to another specific embodiment of the present application. [Figure 90] This is a schematic diagram of the structure of a negative electrode sheet according to a specific embodiment of the present invention. [Figure 91] This is a schematic diagram of the structure of a negative electrode sheet according to another specific embodiment of the present application. [Figure 92] This is a schematic diagram of a single nail-driving test of the present invention. [Figure 93] These are the temperature change curves for lithium-ion battery 1# and lithium-ion battery 4# after a single nail-driving test. [Figure 94] These are the voltage change curves for lithium-ion battery 1# and lithium-ion battery 4# after a single nail-driving test. [Figure 95] These are the X-ray diffraction (XRD) spectra of undoped LiMnPO4 and the positive electrode active material produced in Example 2. [Figure 96] This is the energy-dispersive X-ray spectroscopy (EDS) spectrum of the positive electrode active material produced in Example 2. [Figure 97] This is a schematic diagram of the positive electrode active material having the core-shell structure described in the present application. [Figure 98] This is a schematic diagram of a positive electrode active material having a core-shell structure according to one embodiment of the present invention. [Modes for carrying out the invention]

[0086] 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 embodiments and drawings are used to illustrate 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 embodiments described.

[0087] In this description, unless otherwise defined, all technical and scientific terms used have the same meaning as those generally understood by those skilled in the art. The terms used are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms "includes" and "has" and their synonyms in the description of the specification, claims, and drawings are intended to be non-exclusive. "Multiple" means two or more. The directions or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for the purpose of facilitating and simplifying the description of this application and do not indicate or imply that the devices or elements in question have a specific orientation, or are composed of and should be operated in a specific orientation, and therefore should not be understood as limiting this application. Furthermore, terms such as "first," "second," and "third" are used solely for explanatory purposes and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but is within an acceptable margin of error. "Parallel" here doesn't mean perfectly parallel in the strict sense, but rather within a tolerable margin of error.

[0088] References to “Examples” in this Application mean that certain features, structures, or properties described in relation to the Examples may be included in at least one Example of this Application. Where the term “Examples” appears elsewhere in this Specification, it does not necessarily refer to the same Example, nor does it refer to an Example that is mutually exclusive, independent, or substitutable with other Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein can be combined with other Examples.

[0089] All directional expressions appearing in the following description refer to the directions shown in the figures and do not limit the specific structure of the present application. Further explanation is needed in the description of the present application. Unless otherwise explicitly defined and limited, the terms “attached,” “connected,” and “connected” should be understood in a broad sense. For example, they may be fixed connections, detachable connections, or integral connections. They may be directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in the present application depending on the specific circumstances.

[0090] In this application, the term "and / or" merely describes the relationship or connection between related objects, indicating that three types of relationships are possible. For example, A and / or B can represent three situations: A existing alone, A and B existing simultaneously, and B existing alone. In this application, unless otherwise specified, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B," and more specifically, the condition "A or B" is satisfied by either A being true (or existing) and B being false (or not existing), or A being false (or not existing) and B being true (or existing), or both A and B being true (or existing).

[0091] As used herein, “includes” and “inclusive” refer to both open and closed forms unless otherwise specified. For example, “includes” and “inclusive” may include or include other components not listed, or may include or include only the listed components.

[0092] The “range” disclosed herein is defined in the form of a lower and upper limit, and a given range is defined by selecting one lower limit and one upper limit, the selected lower and upper limits defining the boundaries of a particular range. Ranges defined in this manner may or may not include the values ​​at both ends and can be combined in any way, that is, any lower limit can be combined with any upper limit to form a range. Any lower limit may be combined with any upper limit to form an unspecified range, any lower limit may be combined with other lower limits to form an unspecified range, and similarly, any upper limit may be combined with any other upper limit to form an unspecified range. Furthermore, even if not explicitly stated, each point or individual number between the endpoints of a range is included within that range. Thus, each point or individual number, as its own lower or upper limit, can be combined with any other point or individual number, or with other lower or upper limits, to form an unspecified range.

[0093] For example, if the ranges 60-120 and 80-110 are listed for a particular parameter, it is understood that the ranges 60-110 and 80-120 are also expected. Similarly, if the minimum range values ​​1 and 2 are listed, and the maximum range values ​​3, 4, and 5 are listed, the ranges 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5 are all intended. In this application, unless otherwise specified, the numerical range "a-b" means an abbreviated expression for any combination of real numbers between a and b, where both a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this specification, and "0-5" is merely an abbreviated expression for combinations of these numbers. Also, when a parameter is described as an integer ≥ 2, it 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, a numerical value indicated by "approximately" represents a range, and the range is ±10% of that value.

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

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

[0096] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flattened, rectangular, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to their packaging: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application are not limited thereto.

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

[0098] The housing 10 may include a first part 101 and a second part 102 (as shown in Figures 2 and 3), and by overlapping the first part 101 and the second part 102, both the first part 101 and the second part 102 define a housing cavity 10a for housing the battery cell 20. The second part 102 may be a hollow structure with one end open, and the first part 101 may be a plate-like structure, with the first part 101 overlapping the open side of the second part 102, thereby forming a housing with a housing cavity 10a. Both the first part 101 and the second part 102 may be hollow structures with one side open, with the open side of the first part 101 overlapping the open side of the second part 102, thereby forming a housing with a housing cavity 10a. Naturally, the housing 10 may be of various shapes such as a cylinder or a rectangular parallelepiped.

[0099] To improve the airtightness after connecting the first part 101 and the second part 102, sealing members such as sealing material and sealing rings 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 by adding epoxy resin to glass fibers.

[0101] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell operates primarily by 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 being coated on the surface of the positive electrode current collector, and current collectors without the positive electrode active material layer protruding from the current collectors with the positive electrode active material layer, with the current collectors without the positive electrode active material layer forming the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or 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 is coated on the surface of the negative electrode current collector. Current collectors without the negative electrode active material layer protrude from the current collectors with the negative electrode active material layer, and these uncoated current collectors form the negative electrode tabs. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that melting does not occur due to high current, there are multiple positive electrode tabs, and the negative electrode tabs are also multiple, and they are laminated together.

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

[0103] The above electrolyte solution contains an organic solvent and an electrolyte salt, of which the electrolyte salt plays a role in transporting ions between the positive and negative electrodes, and the organic solvent acts as a transport medium for ions. The electrolyte salt may be one or more of the electrolyte salts known in this field that are used in the electrolyte solution of battery cells, for example, LiPF6 (lithium hexafluoride phosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoride arsenate), LiFSI (lithium bisfluorosulfonylimide), LiTFSI (lithium bistrifluoromethanesulfonylimide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorophosphate), LiBOB (lithium difluorooxalate borate), LiPO2F2 (lithium bisoxalate borate), LiDFOP (lithium difluorooxalate phosphate), and LiTFOP (lithium tetrafluorooxalate phosphate). The organic solvent may be one of the organic solvents known in this field that are used in the electrolyte solution of battery cells, for example, ethylene carbonate One or more, preferably two or more, of the following: t(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), and an appropriate electrolyte salt and organic solvent can be selected according to the actual requirements.

[0104] Naturally, it does not need to contain battery cell electrolyte.

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

[0106] Currently, with the evolving market conditions, the applications of power batteries are expanding rapidly. Power batteries are not limited to applications in energy storage and power systems such as hydroelectric, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, the demand for them in the market is also constantly growing.

[0107] In related technologies, the opening of the battery housing is typically upward in the vertical direction, the battery cells are fixed to the bottom of the battery housing, and the electrode terminals are directed toward a cover that conceals the opening of the housing.

[0108] However, in the battery installed as described above, the inventors noticed that when the battery is installed in a power consumption device, the battery cells are fixed to the bottom of the battery housing, resulting in lower rigidity at the top of the battery housing, which is more susceptible to impact. Furthermore, the force exerted on the internal battery cells during the impact process is not uniform, making the battery more prone to damage, reducing its safety, and potentially affecting its performance.

[0109] In view of this, the embodiment of the present invention provides a technical solution, in which a battery cell housed in a housing cavity of a housing is installed inside the battery, the battery cell is fixed inside the housing cavity, and the electrode terminals of the battery cell are positioned to face the bottom wall of the housing cavity. In this way, the safety of the battery can be effectively improved.

[0110] The technical solutions described in the embodiments of this application are applicable to a variety of devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft, with spacecraft including aircraft, rockets, space shuttles, and spaceships.

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

[0112] For example, Figure 1 shows a schematic diagram of the structure of a vehicle 1000 according to one embodiment of the present invention. The vehicle 1000 may be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A motor 101, a controller 102, and a battery 100 can be installed inside the vehicle 1000, and the controller 102 is used to control the battery 100 and supply power to the motor 101. For example, the battery 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, and for example, the battery 100 can be used as the operating power source for the vehicle 1000's circuit system, for example, to meet the power requirements for starting the vehicle 1000, navigation, and driving. In another embodiment of the present invention, 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, by substituting or partially substituting fuel or natural gas.

[0113] To meet various power consumption demands, the battery 100 may include one or more battery cells 20. For example, Figures 2 and 3 show schematic diagrams of the structure of a battery 100 according to one embodiment of the present invention, and the battery 100 may include multiple battery cells 20. The battery 100 may further include a housing 10, the inside of which has a hollow structure, and the multiple battery cells 20 are housed inside the housing 10. For example, the multiple battery cells 20 may be connected in parallel, in series, or in series-parallel and then arranged inside the housing 10.

[0114] Optionally, the battery 100 may include other structures, which are not described herein. For example, the battery 100 may further include a bus member, which is used to realize electrical connections between a plurality of battery cells 20, such as parallel, series, 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. The electrical energy of the plurality of battery cells 20 may further be drawn 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 depending on the different power demands; for example, there may be only one battery cell 20. Multiple battery cells 20 may be connected in series, parallel, or series-parallel configurations to achieve a larger capacity or output. Because each battery 100 contains a large number of battery cells 20, the battery cells 20 can be grouped together for easier 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 may contain multiple battery modules, and these battery modules can be connected in series, parallel, or series configurations.

[0116] Figure 4 shows a schematic diagram of the structure of a battery cell 20 according to one embodiment of the present invention, which includes one or more electrode assemblies 22, a housing 211, and an end cover 212. The housing 211 and the end cover 212 form the 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, and in the case of 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 after one or more electrode assemblies 22 are combined, for example, the housing 211 may be a hollow rectangular parallelepiped, cube, or cylinder, and one face of the housing 211 has an opening, and one or more electrode assemblies 22 can be placed inside the housing 211. For example, if the housing 211 is a hollow rectangular parallelepiped or cube, one of the planes of the housing 211 is an opening, and this plane has no wall and connects the inside and outside of the housing 211. The housing 211 may be a hollow cylindrical body, in which case the end face of the housing 211 is an open surface, that is, the end face has no wall and communicates 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 placed. The housing 211 is filled with an electrolyte, such as an electrolyte solution, and the material of the housing 211 can be any of several materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and the embodiments of this application are not particularly limited thereto.

[0117] The battery cell 20 may further include two electrode terminals 214 mounted on an 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, with the two electrode terminals 214 being a positive terminal 214a and a negative terminal 214b, respectively. A connecting member 23 (also referred to as a current collector member) is installed 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 Figure 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 the positive electrode tab, then the second tab 222a is the 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 depending on the requirements of actual use, and Figure 4 shows that four independent electrode assemblies 22 are installed in the battery cell 20.

[0120] The battery cell 20 may be further equipped with a pressure reduction mechanism 213. The pressure reduction mechanism 213 is used to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold. Specifically, the pressure reduction mechanism 213 is an element or component that operates to release 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 operates or is triggered to a certain state, thereby releasing the internal pressure of the battery cell 20. The operation of the pressure reduction mechanism 213 includes, but is not limited to, rupturing, shattering, tearing, or opening of at least a part of the pressure reduction mechanism 213, thereby forming an opening or passage from which the internal pressure can be released. At this time, the high-temperature, high-pressure material inside the battery cell 20 is discharged as waste from the activated point. This method allows pressure to be released from the battery cell 20 under controllable pressure conditions, avoiding the occurrence of potential and more serious accidents. The pressure reducing mechanism 213 can be of the form of, for example, an explosion-proof valve, an air valve, a pressure reducing valve, or a safety valve, and more specifically, a pressure-sensitive element or structure can be used.

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

[0122] Figures 10 and 11 show schematic diagrams 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. The housing 10 contains a housing cavity 10a, which includes a ceiling wall 101 and a bottom wall 102 that are positioned opposite each other in the vertical direction z. The ceiling wall 101 and the bottom wall 102 are arranged sequentially from top to bottom in the vertical direction. The battery cell 20 is housed in the housing cavity 10a and includes electrode terminals 22 and 214. Electrode terminal 22 is electrically connected to electrode terminal 214, thereby allowing the battery cell 20 to supply electrical energy.

[0124] The battery cell 20 is fixed within the housing cavity 10a, and the electrode terminals 214 are positioned facing the bottom wall 102 of the housing cavity 10a, providing ample space for electrical connection to the electrode terminals 214. This improves the energy density of the battery 100 and enhances its usability and safety.

[0125] For example, by fixing the battery cell 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 the sake of simplicity, the vertical direction will be defined as the up and down direction. Note that when using battery 100, the vertical direction may be any other direction, but it is not particularly limited here.

[0127] In some embodiments, as shown in Figure 5, the battery cell 20 includes a first wall 201 and a second wall 202 connected to each other, the first wall 201 being the wall with the largest area in the battery cell, and the second wall 202 being installed intersecting 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] Selectively, the battery cell 20 forms 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 a first direction x, and the second wall 202 is located on at least one of the two sides of the battery cell 20 in a second direction y, and the second wall 202 is located on at least one of the two sides of the battery cell 20 in a vertical direction z, and the electrode terminals 214 may be provided on the second wall 202 in the vertical direction z of the battery cell 20, and of course, as shown in Figure 6, the electrode terminals 214 may be provided on the second wall 202 in the second direction y of the battery cell 20.

[0129] The electrode terminal 214 is installed on the second wall 202. 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. This makes it easy to install the electrode terminal 214, and at the same time allows clearance for the electrode terminal 214 and the reinforcing element 30, which will be described later. This eliminates the need to install a clearance section on the reinforcing element 30 for the electrode terminal 214, which is advantageous in simplifying the structure of the reinforcing element 30.

[0130] Selectively, in the example shown in Figure 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 if the electrode terminals 214 are provided on the second wall 202, the electrode terminals 214 may be located at one or both ends of the battery cell 20 in the length direction, and / or the electrode terminals 214 are located at one or both ends of the battery cell 20 in the width direction.

[0131] Naturally, the placement of the electrode terminals 214 is not limited to this in the present invention. As shown in Figures 7 and 8, the electrode terminals 214 may be provided on the first wall 201, and similarly, the arrangement of the electrode terminals 214 is easy; for example, 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 invention offers high flexibility regarding the placement of the electrode terminals 214.

[0132] In some embodiments, as shown in Figure 8, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in a first direction x, and in the first direction x, each battery cell 20 is provided with a first surface 203 that is installed facing a first wall 201, and a relief groove 203a is provided on the first surface 203, and the relief groove 203a of one of two adjacent battery cells 20 is used to accommodate the electrode terminals 214 of the other battery cell 20, and the first direction x is perpendicular to the first wall 201, thereby enabling the multiple battery cells 20 to be arranged compactly in the first direction and saving occupied space.

[0133] In some embodiments, as shown in Figures 4 to 6, the electrode terminals 214 are provided on the second wall 202, the battery cell 20 includes two opposing first walls 201 and two opposing second walls 202, and at least two electrode terminals 214 are provided, with the plurality of electrode terminals 214 including positive electrode terminals 214a and negative electrode terminals 214b.

[0134] Here, assuming that at least two electrode terminals 214 are installed on the same second wall 202, thereby ensuring that adjacent electrode terminals 214 have an appropriate spacing, it is advantageous to save space occupied by the battery cell 20. Alternatively, at least one electrode terminal 214 is installed on each second wall 202, thereby ensuring that electrode terminals 214 located on different second walls 202 have sufficient spacing.

[0135] For example, in the examples in Figures 4 and 5, the battery cell 20 includes two first walls 201 positioned opposite each other along a first direction x and two second walls 202 positioned opposite each other along a vertical direction z, where the vertical direction z is not parallel to the first direction x, but for example, vertical direction z is perpendicular to the first direction x, and all of the electrode terminals 214 are located on the same second wall 202 in the vertical direction z of the battery cell 20.

[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 on the second wall 202 of the battery cell 20 in the vertical direction z.

[0137] In the example shown in Figure 11, the electrode terminals 214 are provided on the second wall 202 facing the bottom wall 102 in the vertical direction of the battery cell 20.

[0138] Naturally, in a rectangular parallelepiped battery cell 20, the battery cell 20 may include two second walls 202 that are positioned opposite each other along a 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 all of the electrode terminals 214 are located on the same second wall 202 in the second direction y of the battery cell 20.

[0139] Even if 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, if there are multiple battery cells 20 and the multiple battery cells 20 are arranged sequentially along the second direction y, the second walls 202 of two adjacent battery cells 20 face each other in the second direction y.

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

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

[0142] In some embodiments, as shown in FIG. 9, second walls 202 are provided at both axial ends of the first wall 201. When electrode terminals 214 are provided on at least one of the second walls 202, all of the electrode terminals 214 of the battery cell 20 are provided on one of the second walls 202, or at least one of the electrode terminals 214 of the battery cell 20 is provided on one of the second walls 202, and the remaining electrode terminals 214 of the battery cell 20 are provided on the other second wall 202. Thereby, a flexible arrangement of the electrode terminals 214 is realized.

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

[0144] Of course, 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 terminals 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 can similarly realize normal power supply of the battery cell 20.

[0145] In some embodiments, at least one battery cell 20 is a soft-pack battery cell. When the battery 100 includes one battery cell 20, the battery cell 20 is a soft-pack battery cell. When the battery 100 includes a plurality of battery cells 20, at least one of the plurality of battery cells 20 is a soft-pack battery cell. Thereby, the types, structures, and layouts of the battery cells 20 of the battery 100 are enriched, which is advantageous for meeting the needs in the differentiation of the applications of the battery 100.

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

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

[0148] As a result, the pressure reduction mechanism 213 has a certain degree of flexibility with respect to the position of the electrode terminals 214.

[0149] Currently, with the evolving market conditions, the applications of batteries are expanding more and more. Batteries are not only used in energy storage and power systems such as hydroelectric, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application fields of batteries continue to expand, the demand for them in the market is also constantly growing.

[0150] The applicant noted that when external water vapor enters the housing, it causes corrosion of the battery cells and other devices inside the housing, reducing the safety and service life of the battery. In related technologies, to improve the airtightness of the battery, an additional sealing structure (such as a sealing plate) is installed inside the housing. However, the additional sealing structure makes the battery structure more complex and costly.

[0151] To improve the safety and lifespan of the battery, the applicant, through research, discovered that designing the casing itself as a sealed structure makes it 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 at the bottom of the main body 11, and the bottom cover 12 and the main body 11 together form a housing cavity 10a.

[0153] The main body 11 may be a one-piece molded structure or may be formed by assembling multiple parts. The main body 11 may be a hollow housing structure that defines a first space, the bottom of the first space is open, and the bottom cover 12 is placed over the open portion of the first space. The bottom cover 12 may be a hollow structure with one side open, and may have a second space, and the second space of the bottom cover 12 and the first space of the main body 11 together form a housing cavity 10a. The bottom cover 12 itself does not have to have a space that forms the housing cavity 10a, and 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 a housing cavity 10a equivalent to the first space, and at this time the bottom cover 12 may have a flat plate structure. Naturally, the housing cavity 10a of the housing 10 may be formed in the first space of the main body 11. In this case, the bottom cover 12 is placed over the opening of the first space, recessed into the first space, and occupies a portion of the first space. The first space, excluding the portion occupied by the bottom cover 12, forms the housing cavity 10a of the housing 10.

[0154] To make it easier to understand, the bottom cover 12 is located at the bottom of the housing 10 and is used together with the main body 11 to define the housing cavity 10a. Specifically, the bottom cover 12 may have a plate-like structure, a block-like structure, etc., but is not limited to these, and may also be flat, curved, etc., and is not specifically limited.

[0155] When the battery cell 20 is located in the housing cavity 10a, the battery cell 20 may be mounted on the bottom cover 12 and / or the main body 11. If the main body 11 is formed by assembling multiple parts, the battery cell 20 may be mounted on one of the parts or on all of the parts. In one embodiment, the main body 11 may include a top cover, a surrounding plate and a support plate, the surrounding plate forming a third space with both vertical ends open, the top cover and bottom cover 12 sealingly covering both vertical ends of the third space, the top cover (e.g., a mounting member 11a described later), the surrounding plate (e.g., a frame 11b described later) and the bottom cover 12 all forming a surrounding housing cavity 10a, the support plate is located within the third space and the battery cell 20 is supported by the support plate. In other embodiments, the main body 11 includes a mounting member 11a and a frame 11b, which are described below, and specifically as follows. In this application, the mounting member 11a may also be called a support plate or top plate, and the frame 11b may also be called a side plate.

[0156] The bottom cover 12 and the main body 11 may be fixed together by methods such as welding, hot melt connection, adhesive, fastening connection, or locking. Fastening connection refers to connection achieved by fastening member 13, which includes members such as bolts, plugs, rivets, pins, and screws. Locking refers to fixing achieved by an engaging structure; for example, the bottom cover 12 may have a hook and the main body 11 may have a locking opening, and the bottom cover 12 and the main body 11 can be fixed together by the hook engaging into the locking opening. Naturally, the method of connection between the bottom cover 12 and the main body 11 is not limited to these, and this application does not list all possible methods.

[0157] In some embodiments, the bottom cover 12 and the main body 11 are sealed together to form a sealed housing cavity 10a. In this case, the housing 10 is surrounded by its own bottom cover 12 and its own main body 11, forming a sealed housing cavity 10a. The airtightness of the battery 100 is guaranteed by the airtightness of the housing 10 itself, eliminating the need for other sealing structures. There is no need to install any additional sealing structures inside the housing 10, which simplifies the structure of the battery 100, reduces the cost of the battery 100, and simultaneously guarantees the safety and service life of the battery 100.

[0158] There are various methods for sealing the connection between the bottom cover 12 and the main body 11. These include, but are not limited to, a sealing member being installed between the bottom cover 12 and the main body 11 to seal the connection via the sealing member, a sealing material being used to seal the connection between the bottom cover 12 and the main body 11, or the bottom cover 12 and the main body 11 being inserted into each other and sealed through a barrier structure formed by the insertion surface.

[0159] In the description of this application, the bottom cover 12 of the battery 100 is located at the bottom of the main body 11, that is, in the vertical direction z shown in Figures 10 and 11, the bottom cover 12 is located at the bottom of the main body 11. In actual use, the vertical direction shown in Figures 10 and 11 may be the vertical direction, but is not limited to this, and will be determined according to the actual mounting situation of the battery 100. In the following description of this application, the positional relationships and dimensions of each structure of the battery 100 are described with respect to the vertical direction, but this is not intended to limit the structure or usage method of the battery 100, but rather to make the description and explanation of the solution clearer.

[0160] In some embodiments, the bottom cover 12 is sealed and connected to the main body 11 via a sealing member.

[0161] A sealing member is a component that prevents fluids or solid particles from leaking between adjacent bonding surfaces and prevents external foreign matter such as dust and moisture from entering the battery 100. The sealing member sealing 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, and has an annular contact interface between these two surfaces, thereby preventing external moisture from entering the battery 100 through the contact cross-section between itself and the two surfaces, and thus achieving a sealing effect.

[0162] The sealing member may be selected from a sealing ring or a gasket. Specifically, the sealing member may be made from a material such as rubber or silicone. Specifically, the sealing member may be selected from an O-shaped sealing member, a rectangular sealing member, a non-standard shaped sealing member, etc. The specific shape of the sealing member can 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, ensuring a secure seal at a low cost.

[0164] Furthermore, after the bottom cover 12 achieves a seal with the main body 11 via a sealing member, it may be further fixedly connected to the main body 11 by other means. Other means include, but are not limited to, fastening, insertion, bolting, riveting, welding, and bonding. To understand that, if the bottom cover 12 is sealed to the main body 11 via a sealing material, and the adhesive performance of the sealing material 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 means.

[0165] In some embodiments, as shown in FIGS. 10 and 11, the bottom cover 12 is removably connected to the bottom of the main body 11. In this case, the main body 11 may be directly attached to the mounting body, and the bottom cover 12 and the main body 11 together form a receiving cavity 10a. When it is necessary to replace or maintain the members (such as battery cells) in the receiving cavity 10a, simply removing the bottom cover 12 exposes the members in the battery 100, and the members can be maintained or replaced without having to remove the entire battery 100 from the mounting body, greatly improving the convenience of maintaining the battery 100.

[0166] The bottom cover 12 and the main body 11 being removably connected means that when the bottom cover 12 and the main body 11 are connected, the bottom cover 12 has a first state in which it is fully connected to the main body 11 and forms the receiving cavity 10a, and a second state in which it is not fully connected to the main body 11 or is separated and the battery cell 20 can be exposed and opened. The bottom cover 12 can be switched from the first state to the second state by an external operation, and can also be switched from the second state to the first state, meaning that no parts are damaged during the process.

[0167] If the bottom cover 12 has a second state in which it is not fully connected to the main body 11 and the housing cavity 10a is open, the mounting 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 a fastening member 13 or an engagement method. When the bottom cover 12 rotates relative to the main body 11 until it closes the housing cavity 10a, the bottom cover 12 and the main body 11 are fixedly connected to the main body 11 via the fastening member 13 or the engagement method, and the battery cell 20 is housed in the housing cavity 10a and no longer visible, at which point the bottom cover 12 is in the first state. When the fastening member 13 is removed or the engagement connection is released, the bottom cover 12 rotates relative to the main body 11 until it opens the housing cavity 10a and exposes the position of the battery cell 20, at which point the bottom cover 12 is in the second state. The bottom cover 12 and the main body 11 are rotatably connected, but this does not mean they are rotatably connected via a pivot shaft.

[0168] If the bottom cover 12 has a second state in which it is separated from the main body 11 and the housing cavity 10a is open, the mounting 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 only via the fastening member 13 or an engagement method. When the fastening member 13 is attached to the bottom cover 12 and the main body 11, or the engagement structure of the bottom cover 12 and the main body 11 is engaged, complete fixation between the bottom cover 12 and the main body 11 is achieved and together they form the housing cavity 10a, the battery cells 20 are housed in the housing cavity 10a and are no longer visible, and at this time the bottom cover 12 is in the first state. When the fastening member 13 is removed or all engagement connections are released, the bottom cover 12 can be separated from the main body 11, the battery cells 20 are exposed, and at this time 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 a receiving 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 on or replace 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 a screw, a bolt, a rivet, a plug, a pin shaft, a stud weld, etc., but is not limited thereto.

[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, the weight of the battery 100 can be effectively reduced, and it is proved that 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, as can be understood, 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 / M < 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 0.04mm / Kg, 0.05mm / Kg, 0.1mm / Kg, 0.4mm / Kg, 0.8mm / Kg, 1mm / Kg, 1.5mm / Kg, 2mm / Kg, 2.5mm / Kg, 3mm / Kg, 3.5mm / Kg, 4mm / Kg, 5mm / Kg, 6mm / Kg, 8mm / Kg, 10mm / Kg, 12mm / Kg, You may choose from 13mm / Kg, 15mm / Kg, 16mm / Kg, 18mm / Kg, 20mm / Kg, 30mm / Kg, 35mm / Kg, 40mm / Kg, 45mm / Kg, 50mm / Kg, 55mm / Kg, 60mm / Kg, 65mm / Kg, 68mm / Kg, 70mm / Kg, 75mm / Kg, 80mm / Kg, 85mm / Kg, 90mm / Kg, 95mm / Kg, or 98mm / Kg.

[0181] Table 1. The 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. JPEG0007860245000001.jpg106130

[0182] Table 1 shows the test results of the effect of several ratios of the minimum thickness h of the bottom cover 12 to the weight m2 of the battery cell 20 on the safety performance of the battery 100, when tested according to the GB38031-2020 standard "Safety Requirements for Power Storage Batteries for Electric Vehicles". As can be seen from Table 1, when h / m2 is equal to 0.02 mm / Kg, the battery 100 easily ignites and explodes, because the structural strength of the battery 100 does not meet the requirements. When h / m2 is greater than 0.02 mm / Kg, the bottom cover 12 has high structural strength and the battery 100 is less likely to ignite and explode, but if h / m is too large, space is wasted and the energy density becomes too low, so it is desirable that h / m2 does not exceed 100 mm / Kg.

[0183] In this case, it was proven that when the minimum thickness h of the bottom cover 12 and the weight m2 of the battery cell 20 satisfy the condition 0.03 mm / Kg ≤ h / M2 ≤ 100 mm / Kg, the battery 100 not only has high structural strength but also high energy density and is less prone to ignition and explosion.

[0184] In some embodiments, referring to Figures 10 to 12, the bottom cover 12 has a cover portion 12a and a mounting portion 12b, the mounting portion 12b is connected to surround the edge of the cover portion 12a, the cover portion 12a is used to define the housing cavity 10a and the mounting portion 12b is connected to the main body 11.

[0185] The statement that the cover portion 12a is used to define the housing cavity 10a means that the cover portion 12a and the main body 11 together form a structure surrounding the housing cavity 10a, while the mounting portion 12b is connected to the main body 11 and does not participate in determining the housing cavity 10a. The cover portion 12a may be a plate-shaped, block-shaped member, or a flat plate-shaped, curved plate-shaped member, and is not specifically limited. As can be seen from Figures 10 to 12, the statement that the mounting portion 12b surrounds the edge of the cover portion 12a means that the mounting portion 12b is installed in a structure in which the ends are continuously sealed together along the edge of the cover portion 12a. To understand this, in the vertical projection, the mounting portion 12b has a certain width, which allows it to have an appropriate contact area with the main body 11, facilitating positioning and installation between the mounting portion 12b and the main body 11, as well as facilitating the installation of the sealing member and improving the airtightness between the mounting portion 12b and the 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 metal (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 plastic (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 metal, the cover portion 12a and the mounting portion 12b may be welded or bonded together. If the cover portion 12a and the mounting portion 12b are made of plastic, the cover portion 12a may be integrally bonded to the mounting portion 12b. Naturally, the cover portion 12a and the mounting portion 12b may be fixedly connected by other methods such as locking 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 may be in the same plane, and / or the two surfaces of the cover portion 12a and the mounting portion 12b that are away from the main body 11 may be in the same plane. If the two surfaces of the cover portion 12a and the mounting portion 12b facing the main body 11 and the two surfaces that are away from the main body 11 are in the same plane, the cover portion 12a and the mounting portion 12b may form a flat bottom cover 12 (see Figure 15).

[0188] The cover portion 12a and the mounting portion 12b do not necessarily 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 it may protrude toward the opposite side of the main body 11 relative to the mounting portion 12b, and this is not specifically limited. The thicknesses of the cover portion 12a and the mounting portion 12b may be equal or different, and this is not specifically limited.

[0189] In this configuration, the bottom cover 12 defines the housing cavity 10a via the cover portion 12a and connects to the main body 11 via the mounting portion 12b, resulting in a clear structure and easy installation.

[0190] To make it clear, when the bottom cover 12 and the main body 11 are sealed together, the bottom cover 12 is sealed to the main body 11 via the mounting portion 12b, that is, the mounting portion 12b is sealed to the main body 11. The method of sealing between the mounting portion 12b and the main body 11 may be a sealing connection of a sealing member, a sealing connection of a sealing material, etc., and this is not to list all specific examples. The sealing member may be the sealing member mentioned in the above description, and the method of installing the sealing member can be based on the above description, the difference being that the sealing member is installed between the mounting portion 12b and the main body 11. When a sealing material is used to seal the connection between the mounting portion 12b and the main body 11, the sealing material may be applied to the entire surface in contact between the mounting portion 12b and the main body 11.

[0191] To make it easier to understand, 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, that is, the mounting portion 12b is detachably connected to the main body 11. The method of detachably connecting the mounting portion 12b and the main body 11 can be described by referring to the detachable method of connecting 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. Therefore, the explanation 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 main body 11 are detachably connected.

[0193] Specifically, the bottom cover 12 further includes a fixing hole 12c installed in the mounting portion 12b, and the fastening member 13 is fastened to the main body 11 after passing through the fixing hole 12c of the mounting portion 12b. The fixing hole 12c is a through hole that penetrates the mounting portion 12b in a vertical direction, and specifically, the fixing hole 12c may be a smooth through hole (if the fastening member 13 is a rivet), a through hole with screw threads (if the fastening member 13 is a screw), or a through hole of another type (hexagonal hole, square hole, oval hole, etc.). The specific form of the fixing hole 12c is determined according to the specific form and specific installation method of the fastening member 13, and is omitted from this explanation.

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

[0195] When the cover portion 12 and the mounting portion 12b are integrally molded, they can be integrally molded using methods such as die-cast integral molding, cold-press integral molding, hot-press integral molding, and injection-molded integral molding, as described above, and these methods will not be explained here. Since the cover portion 12a and the mounting portion 12b have the same thickness, they can be quickly processed from the same metal sheet using methods such as pressing and cutting during molding.

[0196] In this case, the cover portion 12a and the mounting portion 12b have equal thickness, the stress on each part is uniform during molding, the molding rate of the integral molding can be improved, and it can be processed quickly by employing a simple method such as cutting sheet material, and the structure of the bottom cover 12 is simpler and easier to process.

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

[0198] As can be seen from the above, the cover portion 12a defines the housing cavity 10a, and the fact that the cover portion 12a protrudes away from the housing 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 positioned offset vertically, and the cover portion 12a is located at the very bottom of the bottom cover 12. The cover portion 12a protrudes from the mounting portion 12b away from the housing cavity 10a, creating a certain clearance space between the cover portion 12a and the mounting portion 12b. This clearance space increases the distance between the cover portion 12a and the battery cell 20, mitigating the external force acting on the cover portion 12a. This reduces or prevents the external force from acting on the battery cell 20 and damaging it. In particular, when the battery 100 is mounted at the bottom of the vehicle 1000 and the bottom cover 12 is located at the very bottom of the battery 100, even if stones or other objects from the ground easily fly onto the bottom of the battery 100, i.e., the bottom cover 12, during the vehicle 1000's journey and strike the bottom cover 12, the clearance space reduces the impact of the external force on the battery cell 20. At the same time, since the cover portion 12a protrudes from the mounting portion 12b, the cover portion 12a of the bottom cover 12 can serve as a reinforcing structure for the bottom cover 12, improving the bending resistance of the bottom cover 12.

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

[0200] In some embodiments, referring to Figure 16, the bottom cover 12 and the battery cell 20 are installed with a gap between them.

[0201] The fact that the bottom cover 12 and the battery cells 20 are installed with a gap between them means that a set gap r is maintained between the bottom cover 12 and the battery cells 20 in the vertical direction. Due to the action of this set gap r, a buffer space is formed 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 them. In particular, when the battery 100 is mounted at the bottom of the vehicle 1000 and the bottom cover 12 is located at the very bottom of the battery 100, even if stones or other objects from the ground easily fly and hit the bottom of the battery 100, i.e., the bottom cover 12, during the vehicle 1000's driving process, the buffer space prevents the external force from being transmitted to the battery cells 20 and affecting them.

[0202] The method by which the bottom cover 12 and the battery cell 20 are installed with a gap between them may be as follows: The gap is formed by the clearance space created between the protruding cover portion 12a and the mounting portion 12b in the above embodiment, and a set distance may be maintained between one end of the battery cell 20 that is located inside the main body 11 and facing the bottom cover 12 and the other end of the main body 11 that faces the bottom cover 12. In other words, the battery cell 20 is located only within a part of the housing cavity 10a defined by the main body 11, and not within the housing cavity 10a defined by the bottom cover 12, thereby ensuring that a set gap r is maintained between the battery cell 20 and the bottom cover 12, and that a buffer space is formed.

[0203] To make it easier to understand, if the battery 100 contains multiple battery cells 20, all battery cells 20 are installed with a gap between them and the bottom cover 12. Furthermore, to standardize the dimensions of the battery cells 20, the distance between each battery cell 20 and the bottom cover 12 is equal.

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

[0205] The fact that the feature surface 12d faces the housing cavity 10a indicates that the feature surface 12d is an inner surface of the bottom cover 12 that can define the housing cavity 10a. The fact that the feature surface 12d is configured as a plane means that, in the direction of arrangement of the main body 11 and the bottom cover 12, the feature surface 12d is a plane perpendicular to that arrangement direction. In actual situations, when the main body 11 and the bottom cover 12 are arranged vertically, the feature surface 12d of the bottom cover 12 is a plane parallel to the horizontal plane. When the main body 11 and the bottom cover 12 are arranged horizontally, the feature surface 12d of the bottom cover 12 is a plane parallel to the vertical plane.

[0206] If the feature surface 12d is planar, the feature surface 12d may maintain a uniform distance (this distance may be zero) between each battery cell 20 housed in the housing cavity 10a. If the distance between the feature surface 12d and the battery cells 20 is maintained uniformly, the housing cavity 10a can accommodate more battery cells 20, i.e., the space utilization rate of the housing cavity 10a becomes higher, the battery 100 can have a higher energy density, and the range of the battery 100 is further improved.

[0207] To make it clear, if the bottom cover 12 has the cover portion 12a and the mounting portion 12b, the feature surface 12d may be formed by the inner structure facing the housing cavity 10a of the cover portion 12a. To make it even clearer, when the bottom cover 12 and the battery cell 20 are installed with a gap between them, the feature surface 12d and the battery cell 20 are also spaced apart.

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

[0209] The outer surface of the cover portion 12a, away from the housing cavity 10a, and the feature surface 12d are positioned opposite each other along the vertical direction. The outer surface of the cover portion 12a is in contact with the atmospheric environment and is used to withstand external forces. When the outer surface of the cover portion 12a is a flat plane flush with the feature surface 12d, in particular when the bottom cover 12 and the main body 11 are positioned vertically at the bottom of the vehicle 1000, and the bottom cover 12 is located at the very bottom of the battery 100, and the outer surface of the cover portion 12a is flat, the air resistance generated by the battery 100 can be greatly reduced, which helps to reduce the running resistance of the vehicle 1000, reduce the energy consumption of the vehicle 1000, and improve the range of the battery 100.

[0210] Figure 17 is a schematic orthographic projection of the bottom cover 12 shown in Figure 13 in the vertical direction. S1 represents the projected area of ​​the feature surface 12d, and S2 represents the projected area of ​​the bottom cover 12.

[0211] In some embodiments, in the vertical direction, the orthographic area S1 of the feature surface 12d and the orthographic area S2 of the bottom cover 12 satisfy S1 / S2 ≥ 0.2. Furthermore, S1 / S2 ≥ 0.5.

[0212] In the embodiment shown in Figure 17, in the vertical orthographic projection, the feature surface 12d is formed by the connection and enclosing of both ends of the first feature edge d1, the second feature edge d2, the third feature edge d3, and the fourth feature edge d4. The orthographic 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 orthographic area S2 of the bottom cover 12 is the area defined by the edges of the bottom cover 12. Specifically, the ratio of the orthographic area S1 of the feature surface 12d to the orthographic 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 cruising range of battery 100 JPEG0007860245000002.jpg66130

[0214] Table 2 shows the effect of several ratios of the orthographic area S1 of the feature surface 12d to the orthographic area S2 of the bottom cover 12 on the driving range of the battery 100, based on tests conducted according to the NEDC (New European Driving Cycle) standard. When S1 / S2 is less than 0.2, the driving range of the battery 100 is short. This is because a smaller feature surface 12d results in lower space utilization of the housing cavity 10a, fewer battery cells 20 can be housed in the battery 100, and a lower energy density of the battery 100, thus shortening the driving range of the battery 100 and worsening the test results. When the S1 / S2 ratio is 0.2 or higher (especially when S1 / S2 is 0.5 or higher), the larger the ratio, the longer the range of the battery 100. This is because the larger the feature surface 12d, the higher the space utilization rate of the housing cavity 10a, and the higher the energy density of the battery 100. Consequently, the range of the battery 100 increases, and the test results improve further.

[0215] Since the feature surface 12d is flat, the larger the area occupied by the feature surface 12d on the bottom cover 12, the smaller the area of ​​the inner surface on the bottom cover 12 that is recessed or protruding opposite to the feature surface 12d. The inner surface that is recessed relative to the feature surface 12d makes part of the space in the housing cavity 10a irregular, preventing the installation of the battery cells 20 and reducing the space utilization rate of the housing cavity 10a. The space in part of the housing cavity 10a formed by the inner surface that protrudes relative to the feature surface 12d is also irregular, preventing the housing of the battery cells 20 and reducing the space utilization rate of the housing cavity 10a. When the space utilization rate of the housing cavity 10a is low, the volume occupied by the battery cells 20 per unit space in the battery 100 becomes smaller, resulting in a lower energy density of the battery 100. Therefore, the larger the area occupied by the feature 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 range of the battery 100.

[0216] In some embodiments, referring to Figure 17, the orthographic projection of the feature surface 12d is rectangular in the vertical direction.

[0217] As shown in Figure 17, the rectangular feature surface 12d is a region enclosed and defined by the first feature edge d1, the second feature edge d2, the third feature edge d3, and the fourth feature edge d4. In the battery 100, most of the multiple battery cells 20 are assembled to form a rectangular structure, and the feature surface 12d is configured to be rectangular, which can be adapted to the overall structure formed by the battery cells 20 within the battery 100, helping to place more battery cells 20 within the housing cavity 10a and improving the energy density of the battery 100.

[0218] Naturally, in other embodiments, the orthographic projection of the feature surface 12d in the vertical direction may exhibit 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 housing cavity 10a in the main body 11 (for example, the mounting member 11a is the top cover or frame described above), or it may be a member located inside the housing cavity 10a but not for defining the housing cavity 10a (for example, the mounting member 11a is the support plate described above), and is not specifically limited. When the mounting member 11a is used to define the housing cavity 10a, the mounting member 11a may be a member in the main body 11 that is directly connected to the bottom cover 12 (for example, the frame described above), or it may be a member that is not connected to the bottom cover 12 (for example, the top cover described above).

[0220] In some embodiments, a mounting member 11a is provided on the upper part of the housing 10, and the battery cell 20 is provided on the surface of the mounting member 11a.

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

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

[0223] In some embodiments, the battery cell 20 and the mounting member 11a are bonded and bonded together, which reduces the required dimensions in the vertical Z direction when the battery cell 20 is connected to the mounting member 11a, thereby reducing the overall thickness of the battery. Exemplarily, the mounting member 11a is used to define a housing cavity 10a, and the battery cell 20 is suspended from the mounting member 11a.

[0224] Specifically, the battery cell 20 and the mounting member 11a may be bonded together with an adhesive such as epoxy resin adhesive or acrylic resin adhesive, and are not specifically limited. In this case, the bond between the battery cell 20 and the mounting member 11a makes connection easy and simplifies the structure of the battery 100.

[0225] In some embodiments, the wall of the mounting member 11a facing the battery cell 20 constitutes the ceiling wall 101 of the housing cavity 10a, and for example, the battery cell 20 may be provided on the ceiling wall 101 of the housing 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 ignition, and at the same time has a high energy density of the battery and a higher battery endurance ability.

[0227] The thickness of the placement member 11a refers to the distance between the surface of the placement member 11a on which the battery cell 20 is installed and the opposite surface. 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 weights of the main body 11, the bottom cover 12, the battery cell 20 and all other components (such as wire harnesses, thermal management systems, power management systems, 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, 0.2 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 JPEG0007860245000003.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 Road 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 catch fire and 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 catch fire and 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 catching fire 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] In some embodiments, referring to Figures 11, 16, and 27, the battery cell 20 is suspended from the mounting member 11a. Exemplarily, the mounting member 11a is used to define the housing cavity 10a, and the battery cell 20 is suspended from the mounting member 11a.

[0235] The statement that the battery cell 20 is suspended from the mounting member 11a means that the battery cell 20 is installed vertically below the mounting member 11a and that the weight of the battery cell 20 is supported by the mounting member 11a. Methods of suspending the battery cell 20 from the mounting member 11a include the battery cell 20 being directly bonded to the lower surface of the mounting member 11a, the battery cell 20 being connected to the mounting member 11a via a fastening member 13 and located below the mounting member 11a, or the battery cell 20 being suspended from the mounting member 11a via a hook or the like and located below the mounting member 11a.

[0236] In this case, the battery cell 20 is suspended below the mounting member 11a, and the bottom cover 12 is located at the bottom of the housing 10. When maintaining the inside of the battery 100, the battery cell 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 maintaining the battery 100, the battery cell 20 can be attached to and detached from the mounting member 11a from below. In particular, if the mounting member 11a is subjected to force as at least part of the chassis of the vehicle 1000, the battery cell 20 can be attached to and detached from below the mounting member 11a without needing to remove the mounting member 11a, making maintenance of the battery 100 easier.

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

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

[0239] The electrode terminals 214 are located on the outer surfaces of the battery cell 20 other than the first outer surface m1. The first outer surface m1 faces the mounting member 11a and is generally a smooth surface on which the electrode terminals 214, the structure of the liquid injection hole, etc., do not protrude or recess. When the battery cell 20 is suspended from the mounting member 11a, the first outer surface m1 is the outer surface of the battery cell 20 that faces upward. Specifically, in one embodiment, the battery cell 20 includes the housing 211 and the end cover 212, and the housing 211 and the end cover 212 form the internal environment of the battery cell 20 that houses the electrode assembly 23. The end cover 212 is located at one end of the housing 211, and the electrode terminals 214 are located on the end cover 212, and 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 electrode terminal and a negative electrode terminal. The positive electrode terminal is used to electrically connect to the positive electrode sheet in the electrode assembly 23, and the negative electrode terminal is used to electrically connect to the negative electrode sheet in the electrode assembly 23. The positive electrode terminal and the negative electrode terminal may be located on the same outer surface of the battery cell 20 (e.g., a rectangular battery cell 20), or they may be located on two different outer surfaces of the battery cell 20 (e.g., a cylindrical battery cell 20). If the positive electrode terminal and the negative electrode terminal are located on two different outer surfaces of the battery cell 20, the first outer surface m1 is a surface different from these two outer surfaces of the battery cell 20.

[0241] In addition to the battery cells 20, the battery 100 is generally equipped with components such as sampling harnesses, high-voltage harnesses, and protective structures that are electrically connected to each battery cell 20. In this case, the electrode terminals 214 are located on surfaces other than the first outer surface m1 of the battery cell 20, and when components such as sampling wire harnesses, high-voltage wire harnesses, and protective structures are attached to the electrode terminals 214, each component can be positioned through the space between the battery cell 20 and other structures of the main body 11 other than the mounting member 11a (for example, the space between the battery cell and the bottom cover and / or the space between the battery cell and the inner surface of the main body) without being restricted by the mounting member 11a, making the installation of each component easier. At the same time, since the first outer surface m1 is a smooth surface, the first outer surface m1 can be brought into close contact with the mounting member 11a, achieving close contact and attachment between the battery cell 20 and the mounting member 11a, eliminating the need to secure space between the battery cell 20 and the mounting member 11a, and helping to improve the space utilization rate of the battery 100.

[0242] In some embodiments, with reference to Figure 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 on the opposite side of the first outer surface m1, and the electrode terminals 214 are located on the second outer surface m2.

[0243] The second outer surface m2 is the outer surface installed on the opposite side of the first outer surface m1 of the battery cell 20, and 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, there may be a gap between the battery cell 20 and the bottom cover 12. In this case, there is a buffer space between the second outer surface m2 and the bottom cover 12, and the portion of the electrode terminal 214 that extends outside the battery cell 20 is located within this buffer space, thereby allowing the wire harness and connecting tab connected to the electrode terminal 214 to be placed within the buffer space. At the same time, the buffer space can block external forces that strike the bottom cover 12 as described above from acting on the battery cell 20 and damaging it. Therefore, the buffer space not only interrupts the effects of external forces but also allows for the placement of wire harnesses, etc., achieving two goals at once. Furthermore, it improves the space utilization rate of the buffer space and the battery 100.

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

[0245] In some embodiments, referring to Figures 11 and 16, the mounting member 11a is located on the upper part of the housing 10 and is used to define the housing cavity 10a. Since the bottom cover 12 is located at the bottom of the housing 10, the mounting member 11a and the bottom cover 12 are positioned opposite each other. The mounting member 11a is part of the upper structure 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 installed on the mounting member 11a can reinforce the strength of the mounting member 11a, thereby improving the rigidity of the upper part of the battery 100, and thereby expanding the application scenarios of the battery 100 to situations where the upper part is subjected to force, such as when used as part of the chassis of a vehicle 1000.

[0246] In some embodiments, as shown in Figures 20 and 22, the mounting member 11a has a mounting surface 12f facing the housing 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 housing cavity 10a, and is used to define the housing cavity 10a. The mounting surface 12f being configured as a plane means that, in the arrangement direction of the main body 11 and the bottom cover 12, the mounting surface 12f is a plane perpendicular to the arrangement direction. In actual situations, when the main body 11 and the bottom cover 12 are arranged vertically, the mounting member 11a and the bottom cover 12 are installed facing 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 installed facing 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 housing 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 housing cavity 10a, in which case the mounting surface 12f is only the portion of the inner surface of the mounting member 11a used to define the housing cavity 10a.

[0249] If the mounting surface 12f is flat, the mounting surface 12f may maintain a uniform distance (this distance may be zero) between each battery cell 20 housed in the housing cavity 10a. If the distance between the mounting surface 12f and the battery cells 20 is maintained uniformly, more battery cells 20 can be housed in the housing cavity 10a, i.e., the space utilization rate of the housing cavity 10a becomes higher, the battery 100 can have a higher energy density, and the range of the battery 100 is further improved.

[0250] In some embodiments, the battery cell 20 is mounted on a mounting surface 12f. The battery cell 20 is attached to a mounting member 11a via the mounting surface 12f. In this case, when assembling the battery, the mounting member can be attached first, and then the battery cell can be lifted and attached from below. In particular, if the mounting member is at least part of the vehicle chassis, the mounting member can be attached to the mounting body first as a load-bearing structure, and then the battery cell can be lifted and attached from below, making the assembly of the battery easier. The battery cell suspended from the mounting member can reinforce the strength of the mounting member, thereby improving the rigidity of the upper part of the battery, and thus 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 cell 20 may be bonded to the mounting surface 12f, fixedly connected to the mounting surface 12f via a fastening member 13 or the like, or welded or attached to the mounting surface 12f; however, it is not specifically limited.

[0252] Since the mounting surface 12f is flat, it can have a large contact area with the battery cells 20 installed on it, further stabilizing the mounting of the battery cells 20. At the same time, because the mounting surface 12f is flat, it can connect to more battery cells 20 than curved or other non-flat surfaces, increasing the number of battery cells 20 that can be installed in the battery 100, and improving the space utilization rate and energy density of the battery 100.

[0253] To make it easier to understand, when the battery cell 20 is suspended from the mounting member 11a, the battery cell 20 is suspended from the mounting surface 12f.

[0254] In some embodiments, in the vertical direction, the orthographic area N1 of the mounting surface 12f and the orthographic area N2 of the mounting member 11a satisfy N1 / N2 ≥ 0.2. Furthermore, N1 / N2 ≥ 0.5.

[0255] In the embodiment shown in Figure 22, in the orthographic projection in the vertical direction, the mounting surface 12f is formed by the connection and enclosing of both ends of the first mounting edge f1, second mounting edge f2, third mounting edge f3, and fourth mounting edge f4, and the orthographic area N1 of the mounting surface 12f is the area defined by the first mounting edge f1, second mounting edge f2, third mounting edge f3, and fourth mounting edge f4. The orthographic 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 orthographic area N1 of the mounting surface 12f to the orthographic area N2 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 JPEG0007860245000004.jpg54130

[0258] Table 4 shows the effect of several ratios of the orthographic area N1 of the mounting surface 12f to the orthographic area N2 of the mounting member 11a on the driving range of the battery 100 when tested according to 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 a smaller mounting surface 12f results in fewer battery cells 20 mounted on the mounting member 11a, lower space utilization of the housing cavity 10a, and a lower energy density of the battery 100, thus shortening the driving range of the battery 100 and worsening the test results. When the S1 / S2 ratio is 0.2 or higher (especially when S1 / S2 is 0.5 or higher), the larger the ratio, the longer the range of the battery 100. This is because a larger mounting surface 12f allows for a greater number of battery cells 20 to be mounted on the mounting member 11a, increasing the space utilization of the housing cavity 10a and thus increasing the energy density of the battery 100. Consequently, the range of the battery 100 increases, and the test results improve. When the mounting member 11a has a flat plate structure as shown in Figure 20, the orthographic projection area N1 of the mounting surface 12f and the orthographic projection area N2 of the mounting member 11a are equal, resulting in the best range effect for the battery 100.

[0259] In some embodiments, the orthographic projection of the mounting surface 12f is rectangular in the vertical direction.

[0260] As shown in Figure 22, the rectangular mounting surface 12f is a defined area enclosed by the first mounting edge f1, the second mounting edge f2, the third mounting edge f3, and the fourth mounting edge f4. In the battery 100, most of the multiple battery cells 20 are assembled to form a rectangular structure, and the mounting surface 12f is configured to be rectangular, which can be adapted to the overall structure formed by the battery, helping to place more battery cells 20 within the housing cavity 10a and improving the energy density of the battery 100.

[0261] Naturally, in other embodiments, the orthographic projection of the mounting surface 12f in the vertical direction may exhibit other shapes such as circles, polygons, ellipses, and other irregular shapes.

[0262] In some embodiments, referring to Figure 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 housing cavity 10a and the connecting portion 11a2 is connected to the portion of the housing 10 other than the mounting member 11a.

[0263] The mounting portion 11a1 is used to define the housing cavity 10a, and the connecting portion 11a2 is used to connect to parts of the housing 10 other than the mounting member 11a, and does not participate in defining the housing cavity 10a. The mounting portion 11a1 may be a plate-shaped, block-shaped member, or a flat plate-shaped, curved plate-shaped member, and is not specifically limited. As can be seen from Figure 21, when the connecting portion 11a2 surrounds the edge of the mounting portion 11a1, it means that the connecting portion 11a2 has a structure in which its ends are continuously connected along the edge of the mounting portion 11a1. To make it understandable, in a vertical projection, the connecting portion 11a2 has a certain width, which allows it to have an appropriate contact area with other structures of the housing 10 other than the mounting member 11a, and makes it easier to attach and connect the connecting portion 11a2 to other structures of the housing 10 other than the mounting member 11a.

[0264] The mounting portion 11a1 and the connecting portion 11a2 may be integrally molded. If the mounting member 11a is made of metal (aluminum, iron, stainless steel, etc.), the mounting portion 11a1 and the connecting portion 11a2 may be integrally molded using methods such as die casting, forging, hot pressing, or cold pressing. If the mounting member 11a is made of plastic (PP, PE, ABS, etc.), the mounting portion 11a1 and the connecting portion 11a2 may be integrally molded using injection molding. The mounting portion 11a1 and the connecting portion 11a2 may be molded separately and then connected. If the mounting portion 11a1 and the connecting portion 11a2 are made of metal, 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 plastic, the cover portion 12a and the mounting portion 12b may be bonded together. Naturally, the mounting portion 11a1 and the connecting portion 11a2 may be fixedly connected by other methods such as locking 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 a fixed connection. If the connecting portion 11a2 and the portion of the main body 11 other than the mounting member 11a are integrally molded, that is, if the main body 11 is an integrally molded member, it can be integrally molded by methods such as die casting, forging, hot pressing, cold pressing, or injection molding. If 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 made by fastening via a fastening member 13, or by locking connection of an engaging structure, 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 may be in the same plane, and / or the two surfaces of the mounting portion 11a1 and the connecting portion 11a2 that are away from the bottom cover 12 may be in the same plane. When the two surfaces of the mounting portion 11a1 and the connecting portion 11a2 facing the bottom cover 12, and the two surfaces that are away from the bottom cover 12, are all in the same plane, the mounting portion 11a1 and the connecting portion 11a2 may form a flat mounting member 11a (see Figure 20).

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

[0268] In this case, the mounting member 11a defines the housing cavity 10a via the mounting portion 11a1 and connects to the main body 11 other than the mounting member 11a via the connecting portion 11a2, making the structure clear.

[0269] To make it clear, if the mounting member 11a includes the mounting portion 11a1 and the connecting portion 11a2 described above, the battery cell 20 is installed on the mounting portion 11a1.

[0270] To make it clear, when the mounting member 11a includes the mounting portion 11a1 and the connecting portion 11a2, the inner structure of the mounting portion 11a1 facing the housing cavity 10a forms the mounting surface 12f.

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

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

[0273] If the mounting portion 11a1 protrudes away from the housing 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 thickness of the mounting portion 11a1 and the connecting portion 11a2 are equal, the mounting portion 11a1 and the connecting portion 11a2 can be integrally molded from the same sheet material by die casting, cold pressing, or hot pressing, making the molding of the mounting member 11a easier. At the same time, since the thickness of the mounting portion 11a1 and the connecting portion 11a2 are equal, the stress on each part is uniform during molding, which can improve the molding rate of the mounting member 11a.

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

[0277] The outer surface of the mounting section 11a1, away from the housing cavity 10a, and the mounting surface 12f are installed facing each other along the vertical direction. The outer surface of the mounting section 11a1 can be brought into contact with the atmospheric environment. When the battery 100 is installed in the vehicle 1000, the mounting section 11a1, with its flat outer surface, can reduce the running resistance of the vehicle 1000, reduce the energy consumption of the vehicle 1000, and improve the 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 is formed to surround a sealed space 10q that is installed penetrating both vertical ends, the bottom cover 12 and the mounting member 11a are placed over opposing vertical ends of the sealed space 10q, and the bottom cover 12, frame 11b and mounting member 11a together surround the housing cavity 10a.

[0279] The frame 11b itself is formed surrounding a sealed space 10q that penetrates both ends in the vertical direction, the mounting member 11a is placed over the top of the sealed space 10q, and the bottom cover 12 is placed over the bottom of the sealed space 10q. That is, the mounting member 11a is located at the top of the housing 10 and is used to define the housing cavity 10a, and the bottom cover 12 is located at the bottom of the housing 10 and is used to define the housing cavity 10a. The three components, frame 11b, mounting member 11a, and bottom cover 12, all form a structure surrounding the housing cavity 10a. The frame 11b, mounting member 11a, and bottom cover 12 may be manufactured from 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 manufactured from different materials, and are not specifically limited. In vertical orthographic projection, the frame 11b may be rectangular, circular, polygonal, or the like, and is not specifically limited.

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

[0281] In this case, the battery cavity 10a can be formed by using the frame 11b as a base and connecting the mounting member 11a and the bottom cover 12 to the vertical ends of the frame 11b, respectively, resulting in a simple structure for the housing 10.

[0282] In some embodiments, the mounting member 11a and the frame 11b are fixedly connected (e.g., detachably connected) or integrally molded. The mounting member 11a and the frame 11b are integrally molded using methods such as injection molding, die casting, forging, cold pressing, and hot pressing. The mounting member 11a and the frame 11b can be fixedly connected by fastening via a fastening member 13, engagement of an engaging structure, welding, bonding, 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 assembly of the housing 10 can be achieved simply by connecting the main body 11 to the bottom cover 12, making the assembly of the housing 10 easy. When the mounting member 11a and the frame 11b are fixedly connected, the molding process for the mounting member 11a and the frame 11b is easy, and the process cost of the housing 10 can be reduced.

[0284] To make it clear, if 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. If the bottom cover 12 has a cover portion 12a and a mounting portion 12b, it is connected to the frame 11b by the mounting portion 12b.

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

[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. Using the battery cell 20 shown in Figures 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 where 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 where 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 main body 11 and the bottom cover 12 are arranged along the vertical direction z.

[0288] Specifically, the ratio of the height Hc of battery cell 20 to the height Hp of 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. The effect of the ratio of the height Hc of battery cell 20 to the height Hp of battery 100 on the safety of battery 100. JPEG0007860245000005.jpg66130

[0290] Table 5 shows the impact 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 according to the GB38031-2020 standard "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 occupied by the structure of the housing 10 is very small, the strength of the housing 10 cannot meet the requirements, and a safety accident such as ignition and explosion will occur. When Hc / Hp is 0.02 ≤ Hc / Hp, the structural strength of the housing 10 can meet the requirements, and situations of ignition and explosion will not occur. When Hc / Hp is less than 0.02, the structural strength of the housing 10 can meet 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 is the strength requirement of battery 100 met, but safety accidents such as ignition and explosion do not occur, the space utilization rate of battery 100 is increased, and the energy density of battery 100 is increased.

[0292] In some embodiments, referring to Figures 24 to 28, the power consumption device includes a vehicle 1000, and the battery 100 is installed at the bottom of the vehicle body 200. A description of the vehicle 1000 is provided in the description above and is omitted here.

[0293] The body 200 of the vehicle 1000 refers to the part of the vehicle 1000 that carries people and luggage, and includes the driver's seat, passenger space, engine room, cargo space, etc. The body 200 generally includes the body shell and the doors, windows, trim, seats, air conditioning system, etc. that are provided on the body shell. The body shell generally refers to the structure formed jointly by the main load-bearing members of the vehicle 1000, such as the longitudinal beams, transverse beams, chassis, and pillars, and the sheet metal members connected thereto. In the embodiment of the present invention, the statement that the battery 100 is provided at the bottom of the body 200 mainly means that the battery 100 is installed at the bottom of the body shell. At this time, installing the battery 100 at the bottom of the body 200 does not occupy space inside the body 200 and helps to reduce the volume and weight of the body 200.

[0294] In some embodiments, referring to Figure 28, the main body 11 includes a mounting member 11a located on top of the housing 10, the mounting member 11a is used to define the housing cavity 10a, and in the vertical direction, the distance L between the mounting member 11a and the body 200 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 on the battery 100 is closest to the body 200. The distance L between the mounting member 11a and the body 200 refers to the distance in the vertical direction between the top of the mounting member 11a and the body 200 located above it. If the mounting member 11a includes the mounting portion 11a1 and the connecting portion 11a2 described above, 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 housing 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. 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. To make this clear, in this case 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 distance from the bottom of the battery 100 to the body 200 is the mounting 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 between the battery 100 and the body 200 can be incorporated into the space of the battery 100. As a result, when the same space is occupied below the body 200, bringing the battery 100 and the body 200 into close contact can increase the volume of the battery 100, thereby increasing the amount of electricity and energy density of the battery 100.

[0298] In this case, the distance L between the mounting member 11a and the body 200 is equal to zero, and the battery 100 can have a large amount of electricity and a high energy density, resulting in a high driving range for the vehicle 1000. When the distance L between the mounting member 11a and the body 200 is greater than zero, there is flexibility in the mounting of the mounting member 11a.

[0299] In some embodiments, referring to Figures 24 to 28, the main body 11 includes a mounting member 11a located on top of the housing 10, the mounting member 11a is used to define the housing 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 fastening members 13 (screws, bolts, rivets, etc.), welding, or other methods.

[0301] When the battery cell 20 is installed 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 11a is positioned to form at least a portion of the chassis of the body 200.

[0303] The chassis, as part of the body 200, includes a combination of four parts: the transmission system, the drive system, the steering system, and the brake system. It supports and mounts the engine and its various components and assemblies of the vehicle 1000, forming the overall structure of the vehicle 1000, receiving power from the engine and ensuring normal operation.

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

[0305] Based on several embodiments of the present application, and with reference to Figures 24 to 28, the power consumption device includes a vehicle 1000, and a battery 100 is installed at the bottom of the vehicle body 200. The battery 100 includes a housing 10 and battery cells 20, the housing 10 includes a mounting member 11a located on its upper part, the battery cells 20 are located inside the housing 10 and suspended from the mounting member 11a, and the electrode terminals 214 of the battery cells 20 are located on the outer surface of the battery cells 20 away from the mounting member 11a, and the mounting member 11a forms at least a part of the chassis of the vehicle 1000.

[0306] At this time, the battery cell 20 is 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 cell 20 and meeting certain requirements for receiving forces when the mounting member 11a is used as a chassis. At the same time, the electrode terminals 214 of the battery cell 20 are separated from the mounting member 11a, allowing the battery cell 20 to be directly attached to the mounting member 11a, eliminating the air gap between the battery cell 20 and the mounting member 11a, and the eliminated air gap is used to increase the mounting space for the battery cell 20, thereby 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, which are arranged and installed along a 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, and 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 can improve the space utilization rate of the battery 100, improve the energy density of the battery 100, and at the same time the battery cells 20 and the mounting member 11a are integrally connected, which can improve the structural strength of the battery 100.

[0308] As can be seen from this, the top wall 204 of the battery cell 20 is connected to the bottom surface of the mounting member 11a, 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 top 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. This keeps the dimension N of the mounting member 11a in the vertical direction Z within a reasonable range, avoiding wasted internal space in the battery due to an excessively large N. Furthermore, it strengthens the connection between the battery cell 20 and the mounting member 11a, thereby enhancing the structural strength of the battery and improving 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 it may be part of a power consumption device such as a vehicle chassis. If the mounting member 11a is a vehicle chassis, the battery cell 20 is connected to the mounting member 11a, that is, the battery cell 20 is connected to the vehicle chassis surface. The battery cell 20 is directly connected to the vehicle chassis surface, which eliminates the need for a battery housing cover, saves space occupied by the battery housing cover, improves the battery's space utilization rate, and improves the battery's energy density.

[0311] When N / M2 > 100 mm / kg, the vertical dimension N of the mounting member 11a is large, which gives the battery higher 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 battery's energy density.

[0312] If N / M2 < 0.04 mm / kg, the mounting member 11a cannot meet the structural strength requirements of the battery. During battery use, the mounting member 11a may deform in the direction of gravity and eventually break, causing the battery cell 20 to detach from the mounting member 11a, potentially leading to safety accidents such as fire or explosion.

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

[0314] Table 6 Test results for mounting members of different dimensions and battery cells of different weights JPEG0007860245000006.jpg54130

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

[0316] Selectively, 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 connection strength between the mounting member 11a and the battery cell 20. In other embodiments, the mounting member 11a may be connected to the wall with the smallest surface area of ​​the battery cell 20, and the embodiments of the present application are not limited thereto.

[0317] In selectable embodiments, the electrode terminals 214 are provided on the bottom wall 205 of the battery cell 20, and the bottom wall 205 and the top wall 204 are separated and positioned opposite each other along the vertical direction, or the electrode terminals 214 are provided on the side wall of the battery cell 20, the side wall is connected to the top wall 204, and the side wall is parallel to the vertical direction.

[0318] When the battery cell 20 is in use, its vertical orientation may be parallel to the direction of gravity, and its electrode terminals 214 may face the ground along the direction of gravity. For example, the battery 100 includes a mounting member 11a and a housing 10, the housing 10 being located below the mounting member 11a, the top wall 204 of the battery cell 20 facing and connected to the mounting member 11a, the bottom wall 205 of the battery cell 20 facing the bottom of the housing 10, and the electrode terminals 214 also facing the bottom of the housing 10, i.e., the ground. As a result, the top wall 204 where the electrode terminals 214 are not installed may be directly connected to the mounting member 11a, the battery cell 20 and the mounting member 11a are connected as a single unit, improving the overall structural strength of the battery 100, and at the same time eliminating the need to leave a gap between the top wall 201 and the mounting member 11a, improving the space utilization rate of the battery and improving the energy density of the battery.

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

[0320] Selectively, the vertical dimension N of the mounting member 11a is 0.2 mm to 20 mm. Selectively, 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 battery cell 20 according to the vertical dimension of the mounting member 11a.

[0321] Selectively, as shown in Figure 20, the mounting member 11a may be a plate-like structure such as a flat plate. In the case of a plate-like structure, it is sufficient that the surface of the mounting member 11a that contacts the ceiling wall 204 of the battery cell 20 is flat, and other aspects are not specifically limited.

[0322] Selectively, as shown in Figure 31, a cavity 11t is installed 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 contain fluid as a flow path, thereby regulating the temperature of the battery cell 20.

[0323] For example, the cavity 11t is used to house a heat exchange medium and regulate the temperature of the battery cell 20, in which case the mounting member 11a may also be called 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, the heat exchange member may be a member having a passage and may be a thermal management member, or the heat exchange member may be any other member capable of regulating the temperature of the battery cell 20, and the present invention is not limited thereto.

[0324] Selectively, a reinforcing plate 11s may be installed in the cavity 11t, and the reinforcing plate 11s can be extended along a first direction. On the one hand, the reinforcing plate 11s can strengthen the structural strength of the mounting member 11a, and on the other hand, the reinforcing plate 11s can form a plurality of channels inside the mounting member 11a for accommodating a heat exchange medium, and these channels may be in communication with each other or independent of each other.

[0325] The heat exchange medium may be a liquid or a gas, and temperature control refers to heating or cooling multiple battery cells 20. When cooling the battery cells 20, the cavity 11t can contain a cooling medium for controlling the temperature of the multiple battery cells 20. In this case, the heat exchange medium may also be called a cooling medium or cooling fluid, and more specifically, a cooling liquid or cooling gas. The heat exchange medium may also be used for heating, and the embodiments of this application are not limited thereto. Selectively, the heat exchange medium may circulate to achieve a better temperature control effect. Selectively, the fluid may be water, a mixture of water and ethylene glycol, a refrigerant, or air, etc.

[0326] Selectively, as shown in Figure 32, a reinforcing portion 506 is installed on the mounting member 11a. The mounting member 11a may include a first surface 504 and a second surface 505, the second surface 505 being connected to the ceiling wall 204 of the battery cell 20, and the reinforcing portion 506 being installed on the first surface 504 and / or the second surface 505, and the reinforcing portion 506 can strengthen the structural strength of the mounting member 11a. Selectively, the reinforcing portion 506 may be a press-formed projection and / or groove on the mounting member 11a, and the embodiments of the present application are not limited thereto.

[0327] Selectively, as shown in Figure 33, reinforcing ribs 503 are provided on the surface of the mounting member 11a that is away from the battery cell 20 in the vertical direction. In the example of Figure 33, the surface of the mounting member 11a that is away from the battery cell 20 along the vertical direction may be the first surface 504, and the reinforcing ribs 503 are installed above the first surface 504. The reinforcing ribs 503 can strengthen the structural strength of the mounting member 11a.

[0328] Furthermore, the vertical dimension of the reinforcing rib 503 is N3, and if (N+N3) / N>2, then considering only the relationship between the magnitude of N and the weight M2 of the battery cell 20, the relationship 0.04mm / kg≦N / M2≦100mm / kg is satisfied. The reinforcing rib 503 may belong to the battery or to a power-consuming device such as a vehicle, and the reinforcing rib 503 may be installed according to the requirements for the structural strength of the vehicle, and if 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 considered. From another point of view, if the dimension N3 of the reinforcing rib 503 is small, for example, if (N+N3) / N≦2, then the relationship between (N+N3) and M2 satisfies 0.04mm / kg≦(N+N3) / M2≦100mm / kg.

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

[0330] Selectively, the reinforcing rib 503 and the mounting member 11a are integrally molded structures, 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 further connected or assembled by methods such as joining, welding, bonding, machining, or pressing, and the embodiments of the present application are not specifically limited thereto.

[0331] Selectively, the mounting member 11a may be a single-layer plate structure or a multi-layer plate structure. Compared to a single-layer plate structure, the multi-layer plate mounting member 11a has higher rigidity and strength.

[0332] Selectively, as shown in Figure 34, the mounting member 11a includes a first plate 51 and a second plate 52, the second plate 52 being connected to the ceiling wall 204 of the battery cell 20, and the first plate 51 being installed vertically opposite the second plate 52. The second plate 52 may be a flat plate, and the first plate 51 may not be a flat plate. Regarding the specific configuration of the first plate 51, for example, its size, strength, etc., can be adjusted according to the specific requirements of the power consumption device, and the embodiments of this application are not limited thereto. The mounting member 11a may further include a third plate, a fourth plate, etc., and the embodiments of this application do not limit the number of plates included in the mounting member 11a.

[0333] In the embodiment shown in Figure 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. If (N+N4) / N>2, then considering only the space between N and M2, the condition 0.04mm / kg≦N / M2≦100mm / kg is satisfied. If (N+N4) / N≦2, then the condition between (N+N4) and M2 is 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. This ensures that the battery does not ignite or explode, meets the energy density requirements of the battery 100, and at the same time provides better assurance of battery safety.

[0335] In some embodiments, as shown in Figure 35, the battery 100 further includes a reinforcing element 30, and a plurality of battery cells 20 are arranged sequentially along a second direction y, the reinforcing element 30 extends along the second direction y and is connected to a first wall 201 of each battery cell 20 in the plurality of battery cells 20, the first wall 201 being two opposing walls along a first direction x of the battery cell 20, that is, the two first walls 201 are installed facing each other along the first direction x, the first direction x is perpendicular to the first wall 201, and the top wall 201 of the battery cell 20 is installed 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, thereby integrally connecting the reinforcing element 30 to the battery cell 20, and thereby improving the structural strength of the battery. In this case, there is no need to install side plates inside the battery, nor is there a need to install additional structures such as beams, and the space utilization rate inside the battery can be greatly improved, as well as the structural strength and energy density of the battery.

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

[0338] Selectively, the first wall 201 may be the wall with the largest surface area of ​​the battery cell 20, thereby strengthening the connection strength between the reinforcing element 30 and the battery cell 20. In other embodiments, the first wall 201 may be the wall with the smallest surface area of ​​the battery cell 20, and is not limited in detail in the embodiments of the present application.

[0339] Selectively, the battery cell 20 may further include two side walls that are positioned opposite each other along the second direction y, the side walls being 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 being opposite each other.

[0340] Selectively, the dimensions of the reinforcing element 30 in the first direction x are 0.1 mm to 100 mm. This allows for a balance between the strength of the reinforcing element 30 and the energy density of the battery 100.

[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 excessively occupy 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, it is possible to effectively improve the energy density of the battery 100 and improve the structural strength of the battery 100.

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

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

[0344] Selectively, 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, and the insulating layer may be an insulating film or insulating paint.

[0345] Selectively, the reinforcing element 30 is a non-metallic partition plate, that is, the reinforcing element 30 is a non-metallic insulating plate.

[0346] Selectively, the battery 100 includes multiple rows of battery cells 20 and multiple reinforcing elements 30 arranged along a second direction y, with the rows of battery cells 20 and multiple reinforcing elements 30 alternately arranged in a first direction x. In this way, the rows of battery cells 20 and multiple reinforcing elements 30 are interconnected and integrated, and housed within the casing, thereby further ensuring the overall structural strength of the battery 100 and improving the battery's performance.

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

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

[0349] Selectively, as shown in Figure 37, the battery module 100a consists of N rows of battery cells 20 and N-1 reinforcing elements 30, where the reinforcing elements 30 are placed between two adjacent rows of battery cells 20, where N is an integer greater than or equal to 1, and in Figure 37, N is 2. In this way, the number of reinforcing elements 30 can be reduced while improving the energy density of the battery 100.

[0350] For example, as shown in Figure 38, along the first direction x, the number of reinforcing elements 30 is 1 less than the number of rows of battery cells 20; as shown in Figure 39, the number of reinforcing elements 30 is equal to the number of rows of battery cells 20; and as shown in Figure 40, along the first direction x, the number of reinforcing elements 30 is 1 greater than the number of rows of battery cells 20.

[0351] Selectively, a battery module 100a consists of N rows of battery cells 20 and N+1 reinforcing elements 30, where the reinforcing elements 30 are placed between two adjacent rows of battery cells 20, and where N is an integer greater than or equal to 1. Selectively, battery modules 100a with different arrangements of battery cells 20 and reinforcing elements 30 can be combined to form a battery 100.

[0352] Selectively, multiple battery modules 100a are arranged along a first direction, with gaps between adjacent battery modules 100a, which can provide expansion space for the battery cells 20.

[0353] Selectively, as shown in Figure 37, a fixing structure 103 is installed at the end of the reinforcing element 30 in the second direction y, and the reinforcing element 3a is 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 it may be connected to the 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, thereby strengthening the fixed connection between the battery cells 20 and the mounting member 11a, connecting the entire battery 100 as a single unit, and improving the structural strength of the battery 100.

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

[0355] Selectively, the fixing plate 104 may be made of the same material as the reinforcing element 30, such as metal, plastic, or composite material. The thickness of the fixing plate 104 may be the same as that of the reinforcing element 3a. The material or thickness of the fixing plate 104 may differ from that of the reinforcing element 30; for example, the fixing plate 104 may be made of a stronger material or be thicker, but the embodiments of this application are not limited thereto.

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

[0357] The fixing plate 104 and the battery cell 20 may be fixedly connected by adhesive, for example, by a structural adhesive, but the embodiments of this application are not limited thereto.

[0358] Selectively, the fixing plate 104 includes a first connecting portion 105 formed by extending in a direction away from the battery cell 20 along a first direction, and the first connecting portion 105 is used to connect 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 in a position close to the second surface 505 of the fixing plate 104, extending in a direction away from the battery cell 20, i.e., outward, and the second surface 505 is connected via the first connecting portion 105.

[0359] The first connecting portion 105 may be parallel to the second surface 505 of the mounting member 11a, and the area of ​​the first connecting portion 105 may be determined according to the method of fixing to the side wall of the housing 10 to be connected in order to satisfy the requirements for the necessary fixing effect.

[0360] Selectively, 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 the edge of the fixing plate 104 that is close to the second surface 505 toward the battery cell 20. For example, the first connection portion 105 may be formed by bending the upper edge of the fixing plate 104 toward the outside. This makes the first connection portion 105 and the main body of the fixing plate 104 an integrated structure, thereby improving connection performance.

[0361] Selectively, the fixing plate 104 further includes a second connecting portion 107 formed extending away from the battery cell 20 along the first direction, the second connecting portion 107 being used to connect the fixing plate 104 to the reinforcing element 30. For example, the second connecting portion 107 may be formed extending outward, away from the battery cell 20, at the location where the fixing plate 104 and the reinforcing element 30 are connected, and the fixing plate 104 is fixedly connected to the reinforcing element 30 via the second connecting portion 107.

[0362] In addition to selectively connecting the reinforcing element 30, the second connection part 107 can also simultaneously connect 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 part 107.

[0363] The second connection portion 107 may be parallel to the reinforcing element 30. The area of ​​the second connection portion 107 may be determined according to the fixing method in order to satisfy the requirements for the necessary fixing effect.

[0364] The reinforcing element 30 is selectively connected to the first wall 201. The reinforcing element 30 and the first wall 201 are fixedly connected by adhesive, resulting in a simple structure that is easy to process and assemble.

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

[0366] In some embodiments, as shown in Figures 11, 16, 26, 41, 43, and 44, the battery cell 20 is inverted within the housing 10 with the end cover 212 facing the bottom wall 102, thereby strengthening the overall rigidity of the battery and reducing the probability of damage in impact. A depressurization mechanism 213 and electrode terminals 214 are installed on the end cover 212, and both the depressurization mechanism 213 and electrode terminals 214 are positioned facing the bottom wall 102, improving the safety of the battery.

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

[0368] In this way, by installing the battery cell 20 inverted in the housing 10, the battery cell 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 cover 212 of the battery cell 20 is directed toward the bottom of the battery 100, which can increase the energy density of the battery 100 and improve the usability of the battery 100. By positioning the electrode terminals 214 toward the bottom wall 102, a large space for electrical connection can be provided for the electrode terminals 214. By positioning the pressure reduction mechanism 213 toward the bottom wall 102, the pressure reduction direction of the pressure reduction mechanism 213 is directed toward the bottom of the battery 100, thereby preventing the pressure reduction mechanism 213 from being discharged toward other external devices connected to the top of the battery 100 and improving the safety of the battery 100.

[0369] Selectively, the electrode terminals 214 are installed on both sides of the pressure reducing mechanism 213, and naturally, 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 upper part of the housing 10, and the battery cell 20 is fixedly connected to the mounting member 11a.

[0371] The mounting member 11a is installed on the top of the housing 10 and is arranged sequentially from top to bottom along the vertical direction Z with respect to the frame 11b. The mounting member 11a is a plate extending along the horizontal direction and is used to increase the rigidity of the top of the battery 100. The frame 11b is a plate extending along the vertical direction Z and is installed surrounding the mounting member 11a. An opening 10c is formed at the bottom of the housing, providing a space inside the housing 10 for housing the battery cells 20. The battery cells 20 are fixedly connected to the mounting member 11a, which increases the rigidity of the top of the battery 100 and reduces the possibility of the battery 100 being damaged by impact.

[0372] Selectively, the battery cell 20 may be directly connected to the mounting member 11a by adhesive, or it may be fixedly connected by another method.

[0373] Selectively, the frame 11b may be integrally molded with the mounting member 11a, or it may be fixedly connected to the mounting member 11a by welding, bonding, fastening members, or connection methods such as 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 cell 20 are positioned facing the opening 10c of the bottom wall 102, and the end face of the battery cell 20 facing the electrode terminals 214 is fixed to the mounting member 11a. In actual application, the battery 100 is fixed inside an external device, such as a vehicle 1000, via the top of the housing 10. The battery cell 20, positioned on top of the battery 100, can increase the rigidity of the top of the battery 100, reducing the possibility of damage to the battery 100 in the event of a collision and improving the safety of the battery 100. Furthermore, by positioning the electrode terminals 214 of the battery cell 20 toward the opening 10c and fixing the surface of the battery cell 20 facing the electrode terminals 214 to the top of the housing 10, the battery 100 leaves less space for housing the battery cell 20, increasing the energy density of the battery 100 and simultaneously allowing the battery cell 20 to be more securely fitted to the housing 10.

[0375] In an optional embodiment, a cooling passage is embedded inside the mounting member 11a. Since the battery cell 20 is installed on the mounting member 11a, the upper part of the battery cell 20 is in contact with the mounting member 11a. Considering the performance of the battery 100, the passage embedded inside the mounting member 11a allows a gas or liquid, which serves as a heat exchange medium, to pass through it, thereby regulating the temperature of the battery 100 when it is operating, and thereby improving the service life and usability of the battery 100.

[0376] In another optional embodiment, the passage may be installed between the battery cell 20 and the mounting member 11a as a thermal management member, or it may be formed in any other member installed to perform a 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 invention, as shown in Figures 11, 27, and 41, the housing 10 further includes a bottom cover 12 installed in the opening 10c, the frames 11b are connected to each other to form a frame structure, and the bottom cover 12 is fixedly connected to the frames 11b.

[0378] The frames 11b are connected to each other to form a frame structure; that is, the frames 11b are installed in the circumferential direction of the mounting member 11a and are 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 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 being positioned circumferentially around the cover portion 12a and engaging 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 fixedly connected to the frame 11b. Optionally, the mounting portion 12b may be bolted to the frame 11b, or the mounting portion 12b may be fixedly connected to the frame 11b by other means.

[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 greater distance between the battery cell 20 installed inside the housing 10 and the bottom cover 12. 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 decrease its energy density.

[0381] Naturally, the cover portion 12a may also be called the main body portion, and the mounting portion 12b may also be called the 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 cell 20 and the bottom wall 102, thereby supporting the battery cell 20. The battery cell 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 be in direct or indirect contact with the battery cell 20, thereby performing a supporting and resting function, increasing the structural strength of the battery 100, improving the load-bearing capacity of the battery 100, and reducing the possibility of the battery 100 being damaged in impact.

[0383] Naturally, in some examples, the protective assembly 40 may be referred to as the mounting assembly.

[0384] For example, the battery cell 20 is fixedly connected to the mounting member 11a, and the protective assembly 40 is fixedly connected to the battery cell 20, performing multiple fixing functions to the structure of the battery 100 and improving the stability of the battery 100.

[0385] In some embodiments, as shown in Figure 41, the battery cell 20 is placed inverted within the housing 10 with its end cover 212 facing the bottom wall 102, and the protective assembly 40 is in direct or indirect contact with the end cover 212 of the battery cell 20. Contact means that two members are in direct contact with each other or are indirectly locked together through other members, but are not fixed to each other.

[0386] Exemplary, the depressurization mechanism 213 and electrode terminals 214 are mounted on the end cover 212, both of which are positioned facing the bottom wall 102, and the protective assembly 40 supports the battery cell 20 and protects the depressurization 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 at the bottom of the main body 11. The bottom cover 12 is sealed to the main body 11 and together forms a sealed housing cavity 10a. The wall of the bottom cover 12 facing the battery cell 20 constitutes the bottom wall 102 of the housing cavity 10a, and the protective assembly 40 is installed between the battery cell 20 and the bottom cover.

[0388] In some embodiments, as shown in Figures 11 and 41, the battery cell 20 is placed inverted within the housing 10 with its end cover 212 facing the bottom wall 102, the depressurization mechanism 213 and electrode terminals 214 are installed on the end cover 212, the wall of the bottom cover 12 facing the battery cell 20 constitutes the bottom wall 102 of the housing cavity, and the protective assembly 40 is installed between the battery cell 20 and the bottom cover 12, that is, between the depressurization mechanism 213 and electrode terminals 214 and the bottom cover 12, and is positioned to support the battery cell 20 and the bottom cover 12, thereby providing protection to the depressurization mechanism 213 and electrode terminals 214 and performing a protective action against them in the course of impact.

[0389] In some embodiments, as shown in Figure 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 a protective assembly 40 is installed between the bottom wall 102 and the bus member 24, and at the same time the protective assembly 40 is used to install the battery cells 20 insulated from the bottom wall 102.

[0390] As a result, the protective assembly 40 is installed between the bottom wall 102 and the bus member 24 and used to support the battery cell 20. That is, the protective assembly 40 can contact a portion of the battery cell 20 that is not covered by the bus member 24 on both its upper and lower sides, and the bottom wall 102 of the housing cavity 10a, respectively, providing support force to the battery cell 20 in the vertical Z direction. At the same time, the protective assembly 40 ensures that there is a certain gap between the battery cell 20 and the bottom wall 102 of the housing cavity 10a, preventing them from contacting each other. Similarly, the bus member connected to the battery cell 20 maintains a certain distance from the bottom wall 102 of the housing cavity 10a. Both the bus member and the battery cell 20 are installed insulated from the bottom wall 102 of the housing cavity 10a, preventing the bottom wall 102, which is exposed to the outside, from being affected by the external environment and causing electrical interference to the battery cell 20 and the bus member 24.

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

[0392] In some examples, as shown in Figure 41, the battery cell 20 is placed inverted within the housing 10 with its end cover 212 facing the bottom wall 102, and electrode terminals 214 are installed on the end cover 212, which are electrically connected to the corresponding bus member 24. The smooth bottom surface of the battery cell 20 opposite to the top surface on which the electrode terminals 214 are installed is installed in conjunction with the top of the housing 10, and the electrode terminals 214 are located on one side away from the top of the housing 10. This effectively improves the structural strength of the top of the battery 100, and by connecting the bottom of the battery cell 20 and the top of the housing 10 to each other, the utilization rate of the space inside the housing 10 can be improved, thereby improving the overall energy density of the battery.

[0393] In the embodiments of this application, the bus member 24 may be a CCS (Cells Contact System) assembly, that is, an integrated wire harness composed of a flexible circuit board, a plastic structural member, a bus bar, 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 via the bus member. Optionally, the bus member in the embodiments of this 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] Selectively, the bus member 24 may include multiple assemblies, each assembly being connected and installed in accordance with the battery modules that make up the battery cells 20, and these assemblies being electrically connected to form the necessary series / parallel / series-parallel connection relationships, or the bus member 24 may be installed as a single unit, each connected to each battery cell 20 via the same assembly.

[0395] Selectively, the housing 10 includes a mounting member 11a, a frame 11b, and a bottom cover 12, wherein the distance the frame 11b extends in the vertical direction Z is greater than the distance the battery cell 20, bus member, and protective assembly 40 extend in the vertical direction Z, and the bottom cover 12 may be placed over the lower end of the frame 11b.

[0396] In some embodiments, as shown in Figure 42, the protective assembly 40 includes a protective strip 41, which contacts 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 mounting strip. For example, the protective assembly 40 includes a protective member, and the mounting assembly includes a mounting strip.

[0398] Selectively, the protective assembly 40 may include multiple protective strips 41, each of which contacts multiple battery cells 20, maintaining a certain distance between the battery cells 20 and the bottom wall 102, thereby reducing the impact on the battery when the bottom wall 102 is subjected to impact.

[0399] Selectively, the protective strip 41 may contact the surface on which the electrode terminals 214 of the battery cell 20 are installed. Specifically, the protective strip 41 may contact a portion of the surface on which the electrode terminals of the battery cell 20 are installed, other than the area where the electrode terminals are located, that can receive force. For example, the protective strip 41 contacts the "shoulder portions" located on both sides of the electrode terminals in the second direction Y on the surface. Based on this, the protective strip 41 needs to be installed at the corresponding position on the battery cell 20. If there are multiple battery cells 20 and multiple battery cells 20 are arranged in an array, then there are also multiple protective strips 41. The multiple protective strips 41 are installed at intervals along the second direction, and each protective strip 41 extends along the first direction, forming a strip-like structure in which the multiple protective strips 41 are installed parallel to each other at intervals. In addition to the protective strip 41 located at the edge, other protective strips 41 may be installed in positions where they come into contact with adjacent battery cells 20, that is, each protective strip 41 can simultaneously come into contact with two adjacent battery cells 20 in the second direction Y.

[0400] Selectively, the first direction X is perpendicular to the second direction Y, and the first and second directions are perpendicular to the vertical direction, forming a regular and easily machinable structure.

[0401] In several selectable embodiments, as shown in Figures 43 and 44, the orthographic projection of the bottom wall 102 of the electrode terminal 214 is located between the orthographic projections of the bottom wall 102 of adjacent protective strips 41, the protective strips 41 abut against the battery cell 20, and at this time the protective strips 41 abut against the shoulder portion of the battery cell 20, the connection between the electrode terminal and the bus member 24 is not obstructed by the protective assembly 40, and after the battery cell 20 is mounted on the protective assembly 40, the electrode terminal can be dropped between adjacent protective strips 41, distributing the force generated by the impact to multiple battery cells 20, thus avoiding damage to the electrode terminal from impact.

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

[0403] For example, if 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 housing cavity 10a, and the protective strip 41 is fixedly connected to the bottom cover 12.

[0404] The protective strip 41 is selectively bonded to the battery cell 20 and / or the housing 10, i.e., the protective strip 41 is bonded to at least one of the battery cell 20 and the housing 10, making assembly easier.

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

[0406] In selectable embodiments, the multiple protective strips 41 include an edge protective strip 411, a first protective strip 412, and a second protective strip 413, wherein, along a second direction y, the edge protective strip 411 is positioned at the edge of an assembly consisting of an array of battery cells 20, and the first protective strip 412 and the second protective strip 413 are alternately positioned between the two edge protective strips 411.

[0407] The protective strip 41 in the embodiment of the present application may include three types of protective members installed at different positions, with the edge protective strip 411 installed at the edge position of the battery cell 20, and the first protective strip 412 and the second protective strip 413 being installed alternately between the edge protective strip 411. The space between the first protective strip 412 and the second protective strip 413 may have different dimensions, thereby accommodating various connecting members in the bus member and providing the necessary space to connect adjacent battery cells 20.

[0408] Selectively, the protective strips 41 in the embodiments of the present application may have multiple different dimensions, and the dimensions of each protective strip 41 may be adjusted in correspondence based on the length of the battery cell 20 and the position of the electrode terminals 214 and the pressure reducing mechanism thereon, and when each protective strip 41 contacts multiple battery cells 20, each protective strip 41 may also contact two adjacent battery cells 20, in which case the distance between the first protective strip 412 and the second protective strip 413 may be close to the length of the battery cell 20 itself, and the alternately arranged first protective strips 412 and second protective strips 413 can be adapted to the installation of the bus member 24 and form a safe and reliable electrical connection circuit.

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

[0410] As described above, the first protective strip 412 and the second protective strip 413 in the embodiment of the present application may have different lengths in their own extension direction, and a rigid connecting member such as a busbar may be installed by a notch between adjacent second protective strips 413 to form an electrical connection between the battery cells 20, and two adjacent battery cells 20 in the second direction y are electrically connected via the connecting member, that is, the rigid connecting member in the bus member 24 is made available by adjusting the length of the second protective strip 413 and the spacing between adjacent second protective strips 413 in the second direction y.

[0411] Selectively, based on the installation position 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, that is, it may extend integrally and completely inside the housing 10, or the first protective strip 412 may have a blocking opening in the first direction X, thereby allowing the connecting member corresponding to the blocking opening to be installed. By installing the connecting member in the bus member 24 at the location of the blocking opening in the protective strip 41, a certain distance can be maintained between the connecting member and the bottom wall 102, thereby providing impact protection and maintaining insulation.

[0412] In several selectable embodiments, along the second direction Y, the widths of the first protective strip 412 and the second protective strip 413 are 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 in the second direction Y, the edge protective strip 411 does not need to support two adjacent rows of battery cells 20 simultaneously, as the first protective strip 412 or the second protective strip 413 does, 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 it achieves a good support effect.

[0413] Selectively, 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 the embodiments of the present application, the protective strips 41 may protect the edge protective strip 411 installed on the edge and the first protective strips 412 and second protective strips 413 that are alternately installed between the edge protective strips 411, the edge protective strip 411 may contact only one row of battery cells 20 and therefore its width may be smaller than the first protective strip 412 and second protective strip 413, the first protective strip 412 and second protective strip 413 may be installed at the connection point of two adjacent rows of battery cells 20 and may contact multiple battery cells 20 simultaneously. Each first protective strip 412 contacts two adjacent battery cells 20 simultaneously, reducing the number of protective strips 41 required and improving production efficiency.

[0414] Selectively, in the battery provided by the embodiments of the present invention, the width and position of each protective strip 41 in the protective assembly 40 may be designed based on the location and size of the area in the battery cell 20 that overlaps with the protective assembly 40. Specifically, the width of the protective strip 41 can be selected based on the magnitude of the pressure that the battery cell 20 can withstand and the magnitude of the shock that is expected to occur, and the installation position of the protective strip 41 can be selected based on the location of the electrode terminals 214 and the pressure reduction mechanism.

[0415] In the selectable embodiment, the elongation length of the protective assembly 40 in the vertical Z direction is greater than 1.5 mm.

[0416] In the embodiments of the present application, the protective assembly 40 needs to be extended by a certain dimension in the vertical direction Z, that is, each protective strip 41 needs to have a certain thickness, and since the protective assembly 40 provides protection to the battery cell 20 from impact 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 problems such as ignition or explosion occur in the battery, and based on this, the protective assembly 40 needs to have a certain base thickness and provide the corresponding protective strength, and exemplary, the overall thickness of the protective assembly 40 in the embodiments of the present application may be greater than 1.5 mm.

[0417] In some embodiments, as shown in Figures 41 to 44, the depressurization mechanism 213 of the battery cell 20 is also installed facing the bottom wall of the housing cavity. The protective assembly 40 includes a plurality of protective strips 41 spaced apart along the length of the housing 10, and a plurality of battery cells 20 are installed. The depressurization mechanism 213 and electrode terminals 214 of each battery cell 20 are 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 avoiding contact with the electrode terminals 214, etc., and supporting the battery cells 20.

[0418] For the sake of clarity, in some embodiments, the longitudinal direction of the housing 10 is the direction of arrangement of the multiple battery cells 20, i.e., the second direction, i.e., one of the horizontal directions. The longitudinal direction Y and the vertical direction Z are perpendicular to each other, and are considered perpendicular to each other when the angle between the longitudinal direction Y and the vertical direction Z is between 85° and 90°. Note that the longitudinal direction Y may be in other directions, and the longitudinal direction Y does not have to be perpendicular to the height direction Z, and such explanations are omitted in this application.

[0419] Multiple protective strips 41 are arranged at intervals 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. For 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 reduction mechanism 213 and electrode terminals 214 of the battery 100 located between two adjacent protective strips 41, thereby providing protection to the pressure reduction mechanism 213 and electrode terminals 214.

[0420] In some embodiments, as shown in Figure 42, the multiple protective strips 41 include edge protective strips 411, a first protective strip 412, and a 20th protective strip 413, where, along the length direction Y, the edge protective strips 411 are installed on both sides of the arrayed 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 sides of the array-arranged battery cells 20, that is, on the edges of the outermost battery cells 20 in the array, thereby providing support to both battery cells 20 in a position close to the housing 10 of the battery cells 20. The first protection strips 412 and the second protection strips 413 are alternately arranged between the two edge protection strips 411, allowing the protection strips 41 to be more closely adapted to the array arrangement of the battery cells 20, thereby providing better support to the battery cells 20.

[0422] For the sake of clarity, in the embodiment of this application, the width direction of the housing 10 is defined 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 each other, and the angle between the length direction Y, the vertical direction Z, and the width direction X is considered to be perpendicular to each other if the angle between them is between 85° and 90°. Note that the width direction X may be in any other direction, and the width direction X does not have to be perpendicular to the length direction Y and the vertical direction Z. The embodiment of this application will not be explained further here.

[0423] In some embodiments, as shown in Figures 41 and 42, electrical connections are made between multiple battery cells 20 via bus members 24. The bus members 24 span across the electrode terminals 214 of adjacent battery cells 20, connecting the multiple battery cells 20 in series, parallel, or series-parallel. In some embodiments of the present application, since the bus members 24 span across the electrode terminals 214 of adjacent battery cells 20 in the length direction Y, at least some protective strips 41 include notches to accommodate the bus members 24. The notches may be located at one end of the corresponding protective strip 41, and may have other installation locations, determined according to the arrangement of the bus members 24, and are not specifically limited. Thus, in the width direction X, the extended length of the first protective strip 412 is greater than the extended length of the second protective strip 413, and the second protective strip 413 accommodates the bus members 24.

[0424] In the width direction X, the lengths of the first protective strip 412 and the second protective strip 413 are different, allowing the protective members to clear the bus member 24, and the protective assembly 40 better fits the structure of the battery 100, making it easier to realize series connection, parallel connection, and series-parallel connection of the battery cells 20.

[0425] If the bus member 24 is selectively connected across the electrode terminals 214 along another direction, the first protective strip 412 and the second protective strip 413 may be dimensionally modified on a case-by-case basis.

[0426] Selectively, the extended length of the protective strip 41 may represent only 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 may be smaller than that of the first protective strip 412, that is, the second protective strip 413 may allow the bus members 24 to pass at any position, which may be one end of the second protective strip 413 or the central part 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 Figure 42, the protective assembly 40 further includes a main plate 42, a protective strip 41 is connected to the main plate 42, the main plate 42 is located 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] Naturally, the main plate 42 can also be called a connecting plate.

[0429] Selectively, there are multiple protective strips 41, all of which are installed on the surface of the main plate 42 facing the top of the housing 10, and the main plate 42 is installed close to the bottom wall 102. The relative positions of the multiple protective strips 41 can be stabilized via the main plate 42, preventing displacement after impact.

[0430] The main plate 42 is installed extending in the same direction as the bottom wall 102 and in contact with the bottom wall 102, and may be further restricted by grooves 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, thereby improving the insulation performance between the bus member 24 and the battery cell 20 and the bottom wall of the housing 10.

[0431] Selectively, the thickness of the main plate 42 may be greater than 0.5 mm in order to provide the required level of protection.

[0432] Selectively, the main plate 42 is fixedly connected to the bottom wall 102, which helps to securely install the main plate 42 and improves the robustness of the battery 100 structure. For example, the main plate 42 is glued to the bottom wall 102, making assembly easy.

[0433] The main plate 42 may selectively be in contact with the bottom wall 102, and the embodiments of the present application are not limited thereto.

[0434] In some embodiments, the main plate 42 and the protective strip 41 are integrally molded or detachably connected, facilitating the processing of the main plate 42 and the protective strip 41. When the protective strip 41 and the main plate 42 are integrally molded, the manufacturing of the protective assembly 40 can be 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 selectable embodiments, the protective assembly 40 is adhesively fixed to the battery cell 20. In embodiments of the present application, the protective assembly 40 abuts against the shoulder portion of the battery cell 20, in which case the two may be adhesively fixed, further improving overall strength and connection stability, and preventing displacement between the protective assembly 40 and the battery cell 20 due to impact. Selectively, in the protective assembly 40, each protective strip may be adhesively fixed to the corresponding position on the battery cell 20, or at least some of the protective strips may be adhesively fixed to the battery cell 20, including edge protective strips 411.

[0436] In some embodiments, as shown in Figure 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 portion 207 is located on both sides of the functional area 206 along a second direction y, the battery cell 20 is in contact with the protective strip 41 via the shoulder portion 207, and the second direction y is perpendicular to the vertical direction.

[0437] Naturally, the end cover 212 can also be called the top cover plate.

[0438] The functional area 206 is the area on the end cover 212 where the battery cell 20 can perform its own function, or where the battery cell 20 can interact with the outside, such as electrode terminals that allow the battery cell 20 to electrically connect to the outside. Since electrode terminals or other functional components are always installed in the functional area 206, the functional area 206 is not suitable for receiving forces during the use of the battery 100. The shoulder area 207 refers to an area of ​​the end cover 212 other than the functional area 206 that can receive forces.

[0439] The functional area 206 is positioned between the shoulder portions 207, and the shoulder portions 207 can provide a certain level of protection to the functional area 206. The battery cell 20 contacts the protective strip 41 via the shoulder portions 207, allowing the battery 100 to have a more compact structure, preventing the functional area 206 from being subjected to force and damaging it, and extending the service life of the battery cell 20.

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

[0441] In some embodiments, the electrode terminal 214 is positioned between two adjacent protective strips 41, and there is a gap between the electrode terminal 214 and the bottom wall 102 (e.g., bottom cover 12).

[0442] The functional area 206 is located between two shoulder portions 207, and since the shoulder portions 207 abut against the protective strip 41, 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, meaning the electrode terminals 214 do not contact the bottom wall 102, and can be considered to be floating between the two protective strips 41. This makes it easier to extract electrical energy from the battery cell 20 via the electrode terminals 214, improving the usability of the battery cell 20.

[0443] Selectively, the pressure reduction mechanism and electrode terminals of the battery cell 20 are provided on the same side of the battery cell 20, and the pressure reduction mechanism 213 is also installed facing the bottom wall 102, with the pressure reduction mechanism 213 and electrode terminals 214 installed in the functional area 206, and within the functional area 206, the electrode terminals 214 may be installed on both sides of the pressure reduction mechanism 213, thereby reducing the influence of the electrode terminals 214 on the pressure reduction mechanism 213 when the pressure is reduced.

[0444] In some embodiments, as shown in Figure 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 extended height of the electrode terminals 214 that are exposed to a portion of the battery cell 20, so that the electrode terminals 214 are suspended between adjacent protective strips 41 to avoid contact with other components and affecting their function.

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

[0446] The housing 10 may contain one battery cell 20 or multiple battery cells 20. When multiple battery cells 20 are installed in the housing 10, they are arranged adjacent to each other within the housing 10. The protective strip 41 is installed along the main plate 42 with spacing in the first direction X. As a result, the shoulder portions 207 are located on both sides of the functional area 206 along the first direction X, and the shoulder portions 207 can be positioned at the connection points of adjacent battery cells 20. This allows the shoulder portions 207 of two adjacent battery cells 20 to contact the same protective strip 41.

[0447] In the first direction X, adjacent battery cells 20 share the same protective strip 41, which allows for a reduction in the number of protective strips 41 and facilitates the manufacturing 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 (for example, 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 extended 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 extended width D4 of the shoulder portion 207, it can provide sufficient support to the battery cell 20. When the protective strip 41 places two adjacent battery cells 20 on it simultaneously, if the width of the protective strip 41 in the second direction Y is 2 times or less the extended width of the shoulder portion 207, the protective strip 41 will only contact 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 cell 20.

[0450] Preferably, the relationship between the width D11 of the protective strip 41 and the extended width D4 of the shoulder portion 207 may satisfy D4 ≤ D11 ≤ 2D4. Since the protective strip 41 may be offset from adjacent battery cells 20, the width of the mounting strip 41 in the longitudinal direction Y can be set to be greater than or equal to the extended width of the shoulder portion 207, allowing two adjacent battery cells 20 to be mounted on the protective strip 41 simultaneously. This avoids the problem of structural instability being poor due to uneven forces acting on the battery 100, which can occur when only one cell is mounted due to offset.

[0451] In some embodiments, the protective strip 41 is in contact with the electrode terminal 214, or the protective strip 41 and the electrode terminal 214 are installed with a gap between them. This allows for flexible installation of the protective strip 41.

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

[0453] In the embodiment of the present invention, the protective assembly 40 includes a plurality of protective strips 41, which are in contact with the battery cell 20, and the orthographic projection of the bottom wall of the electrode terminals 214 on the battery cell 20 may be located between adjacent protective strips, in which case the protective strips 41 are in contact with the shoulder portion of the battery cell 20, the connection between the electrode terminals 214 and the bus member 24 is not obstructed by the protective assembly 40, and after the battery cell 20 is mounted on the protective assembly 40, the electrode terminals 214 can be dropped between adjacent protective strips 41, distributing the force generated by the impact to the plurality of battery cells 20, thereby avoiding damage to the electrode terminals 214 from impact.

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

[0455] The bus member 24 is a component that provides electrical connections between multiple battery cells 20. The bus member 24 connects across the electrode terminals 214 of adjacent battery cells 20, thereby connecting multiple battery cells 20 in series, parallel, or series-parallel. Because the bus member 24 connects across the electrode terminals 214 of adjacent battery cells 20 in the second direction Y, at least a portion of the protective strip 41 extending along the first direction X needs to be made to accommodate it, forming a relief notch 43.

[0456] The extended length of one of two adjacent protective strips 41 is shorter than the extended length of the other, meaning that protective strips 41 with longer extended lengths and protective strips 41 with shorter extended lengths are arranged alternately. Selectively, the length of the protective strips 41 may be adjusted according to the arrangement of the bus members 24. Furthermore, the extended length of the protective strip 41 in the first direction X simply refers to the sum of the lengths of the protective strip 41 in the first direction X, meaning that the relief notch 43 may be installed at one end of the protective strip 41 or in the center of the protective strip 41, as determined according to the arrangement of the bus members 24, and the embodiments of this application are not particularly limited thereto.

[0457] The protective strip 41 is provided with relief notches 43, allowing the protective assembly 40 to better conform to the structure of the battery 100 and facilitate series, parallel, and series-parallel connections of the battery cells 20.

[0458] In several selectable embodiments, as shown in Figure 18, the battery cell 20 further includes a pressure reducing mechanism 213, which is located on the same side as the electrode terminals 214. By similarly positioning the pressure reducing mechanism 213 on the underside of the battery cell 20, it can be protected together with the electrode terminals 214, avoiding collision with the housing 10, etc., thereby improving the overall safety and reliability of the battery 100.

[0459] Selectively, the depressurization mechanism 213 and the bottom wall 102 are spaced apart, and in the second direction y, the electrode terminals 214 are installed on both sides of the depressurization mechanism 213, thereby reducing the impact on the electrode terminals 214 when pressure is released from the depressurization mechanism 213. Furthermore, the depressurization mechanism 213 and the bottom wall 102 are spaced apart, and the depressurization mechanism 213 does not come into contact with the bottom wall 102, providing the depressurization mechanism 213 with a larger depressurization space, reducing the risk of discharge of waste products and improving the safety of the battery 100.

[0460] In selectable embodiments, as shown in Figures 18, 43, and 44, the orthographic projection of the bottom wall 102 of the decompression mechanism 213 is located between the orthographic projections of the bottom wall 102 of the adjacent protective strip 41. When the battery cell 20 and protective assembly 40 are combined, the decompression mechanism 213 can be positioned between the areas where the adjacent protective strip 41 and the battery cell 20 come into contact with each other. That is, the decompression mechanism 213 is positioned on the side closer to the bottom wall 102 and does not come into contact with the protective assembly 40. This allows the impact force to be distributed to the shoulder portion of the battery cell 20 when subjected to an external impact, preventing the decompression mechanism 213 from being damaged by the impact and improving the safety of the battery 100.

[0461] In some embodiments, as shown in Figure 42, 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 Figure 18) along the length direction Y satisfy 0.2D4≦D1≦D4, 0.5D4≦D2≦2D4, and 0.5D4≦D3≦2D4.

[0462] The edge protection strip 411 is installed on the edge of the battery cell 20 array, and in the longitudinal direction Y, the edge protection strip 411 is in contact only with the shoulder portion 207 on one side of the edge battery cell 20. Since the width D1 of the edge protection strip 411 is less than or equal to the width D4 of the shoulder portion 207, it is possible to avoid the edge protection strip 411 coming into contact with the functional area 206 and affecting the function of the battery cell 20. The width D1 of the edge protection strip 411 is 0.2 times or more the width D4 of the shoulder portion 207, and the edge protection strip 411 can provide sufficient support to the battery cell 20.

[0463] Since the first protective strip 412 is installed between adjacent battery cells 20, the width D2 of the first protective strip 412 is 0.5 times or more the extended width D4 of the shoulder portion 207, so that it can provide sufficient support force to the battery cells 20. Preferably, when the width D2 of the first protective strip 412 is greater than or equal to the extended width D4 of the shoulder portion 207, two adjacent battery cells 20 can be placed on the protective strip 412 at the same time, and the problem of structural instability being poor due to the force received by the battery 100 being uneven when one is placed on the protective strip 412 is not occurring. The width D2 of the first protective strip 412 is 2 times or less the width D4 of the shoulder portion 207, so that when the first protective strip 412 places 20 adjacent battery cells 20 at the same time, it can contact only the shoulder portions 207 of two adjacent battery cells 20, 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 extended width D4 of the shoulder portion 207, and may be 2 times or less the width D4 of the shoulder portion 207.

[0465] In some embodiments, as shown in Figures 41 and 42, the protective assembly 40 further includes a main plate 42, which is positioned between the protective strip 41 and the bottom wall 102 to absorb and disperse horizontal external impact forces, and the protective strip 41 is positioned to protrude vertically from the main plate 42, and the protective strip 41 can form a projection. Exemplarily, the housing 10 includes a bottom cover 12, the wall of the bottom cover 12 facing the battery cells 20 is formed as the bottom wall 102, and the main plate 42 is provided 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 integrally joined, and the main plate 42 extending in the longitudinal direction Y can distribute the force received by the protective assembly 40, thereby improving the structural strength of the battery 100.

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

[0468] To selectively avoid affecting the electrical connections between the battery cells 20, the protective assembly 40 is an insulating member. The insulating member may be an insulating material in its entirety, or it may be an object whose surface is coated with an insulating material (such as an insulating coating) to exhibit overall insulating properties. If the protective assembly 40 is an object with an insulating material coating on its surface, the core material may be a metal material, an insulating material, or a composite material, and the outer surface of the core material is coated with an insulating material. At the same time, the protective strip 41 and main plate 42 must have a certain hardness and elasticity, thereby providing support for the battery cells 20 and allowing for a certain amount of deformation when subjected to impact, thus protecting the battery cells 20.

[0469] Selectively, the protective strip 41 and the main plate 42 may be integrally molded, thereby facilitating the manufacture of the protective assembly 40. The protective strip 41 and the main plate 42 may be detachably connected to each other, allowing for easy adjustment of the position of the protective assembly 40 based on the arrangement of the battery cells 20, and giving the protective assembly 40 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 robustness of the battery 100 structure. Selectively, the main plate 42 may abut against the bottom wall 102, for example, the main plate 42 abuts against the bottom cover 12, but embodiments of the present application are not limited thereto.

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

[0472] When the cover portion 12a of the bottom cover 12 protrudes from the bottom extended surface of the housing 10 relative to the mounting portion 12b, the first distance H1 refers to the distance between the surface having the electrode terminals and pressure reduction mechanism of the battery cell 20 and the cover portion 12a in the vertical direction Z. 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 between the first distance H1 and the weight M2 of a single battery cell 20 can indicate the energy density and structural strength of the battery 100. If the ratio H1 / M2 is too large, the energy density of the battery 100 will be too low, and if the ratio H1 / M2 is too small, the structural strength of the battery 100 will be insufficient, which may lead to safety accidents in the event of a collision. Therefore, H1 / M2 should be 0.2 mm / kg.

[0475] ​​​​To verify that a battery 100 has good performance when the ratio H1 / M2 of the first distance H1 to the weight M2 of a single battery cell 20 is within an appropriate range, a collision test was performed on the battery 100 using collision test apparatus A as an example. As shown in Figure 45, collision test apparatus A includes an impact head A1, a launcher A2, and a frame A3. During the test, the battery 100 is placed on 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 collision direction is vertical Z, the collision position is the weak point of the battery 100, and the collision energy is 90 J.

[0476] Since the battery 100 is applied to a power-consuming device such as a vehicle 1000, the scene after the battery 100 is attached to the vehicle 1000 can be simulated by attaching the top of the housing 10 to the vehicle 1000 and crashing it perpendicularly in the Z direction to the bottom of the battery 100. The weak point of the battery 100 is the location of the battery 100 that is easily destroyed, and this location is always within a radius of 240 mm from the geometric center of the battery 100. By crashing the battery 100 to its weak point, the state of the battery 100 after crashing to a location with weak structural strength can be simulated. The collision energy is 90 J, which may be equivalent to the impact head A1 crashing into the battery 100 at a speed of 4.2 m / s, but other collision energies may also be used, for example, 120 J (collision velocity 4.9 m / s) or 150 J (collision velocity 5.5 m / s) to crash into the battery 100. In the actual experiment, the battery 100 may be struck multiple times with a single collision energy, or it may be struck multiple times with multiple collision energies.

[0477] After impacting the battery 100 with impact testing device A, it is observed for 2 hours at ambient temperature to detect whether or not the battery 100 ignites or explodes. Selectively, after performing an impact test on the battery 100 with impact testing device A, further tests such as the protection rating of the housing may be performed on the battery 100, and the embodiments of this application are not limited thereto.

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

[0479] Table 7 JPEG0007860245000007.jpg60130

[0480] As shown in Table 7, 2 mm

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

[0482] The protective strip 41 has a constant dimension in the height direction Z, and can protrude from the main plate 42 to support and mount the battery cell 20. By setting a second distance N6, a constant distance can be maintained between the end cover 212 of the battery cell 20 and the bottom wall 102, thereby appropriately maintaining the energy density of the battery 100.

[0483] The ratio N6 / M2 between the second distance N6 and 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 is too large, the energy density of the battery 100 will be too low. If the ratio N6 / M2 is too small, the structural strength of the battery 100 will be insufficient, which may lead to safety accidents in the event of a collision. Therefore, if the ratio N6 / M2 satisfies 0.05 mm / Kg ≤ N6 / M2 ≤ 50 mm / Kg, the battery 100 will have good energy density and appropriate structural strength.

[0484] ​A structural strength test can be performed on the battery 100 to verify that the battery 100 has good performance when the ratio N6 / M2 between the second distance N6 and the weight M2 of a single battery cell 20 is within an appropriate range. In the process of performing a structural strength test on the battery 100, the structural strength of the battery 100 can be determined by multiple tests, such as shear strength tests and compressive strength tests.

[0485] In a shear strength test, for example, the battery 100 is fixed between the fixtures of the shear testing machine, and then the battery 100 is driven using the detection head of the shear testing machine to move along the length direction Y or the width direction X at a speed of 5 mm / min, and the tensile force F applied by the detection head when the housing 1 breaks is recorded. Area A is the projected area of ​​the battery 100 in the height direction Z, and the value of F / A is the shear strength that the battery 100 can withstand.

[0486] In the compression strength test, for example, pressure is applied to the battery 100 in the height direction Z and the length direction Y or width direction X using a pressing head, and the head is propelled toward the battery 100 at a speed of 2 m / s. The test is stopped when the pressing force reaches 50 kN or the deformation of the battery 100 reaches 30%, held for 10 minutes, and then the battery 100 is left to stand at ambient temperature for 2 hours after the compression strength test for observation.

[0487] The structural strength of battery 100 can be selectively tested by other structural strength tests, and the embodiments of this 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, with different values ​​for the second distance N6, the weight M2 of a single battery cell 20, and the N6 / M2 ratio, when the battery cells 20 are fixed to the protective strip 41.

[0489] Table 8 JPEG0007860245000008.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, battery 100 has relatively good structural strength in the strength structure test.

[0491] In some embodiments, as shown in Figures 42 and 44, the thickness of the protective strip 41 in the vertical direction is the second distance N6, and the cover portion 12a of the bottom cover 12 protrudes from the extended surface of the bottom wall 102 relative to the mounting portion 12b, so the vertical distance between the cover portion 12a and the mounting portion 12b is the fourth dimension D8. The protective assembly 40 is installed between the battery cell 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 the sixth dimension D10.

[0492] In order for the battery 100 to have appropriate energy density and structural strength, the sum of the second distance N6 and the sixth dimension D10 should be greater than or equal to the fourth dimension D8, i.e., N6 + D10 ≥ D8. That is, in the first direction X, the overall dimension of the protective assembly 40 is greater than the distance difference between the cover portion 12a and the mounting portion 12b, thereby fixing the protective assembly 40 to the battery cell 20, maintaining a distance between the battery cell 20 and the cover portion 12a of the bottom cover 12, and leaving sufficient ejection space for the decompression mechanism 213 when both the decompression mechanism 213 and the electrode terminals 214 face the bottom cover 12.

[0493] In another selectable embodiment, the protective assembly 40 is in contact with the battery cell 20, in which case 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 this range, the battery has good energy density and appropriate structural strength.

[0494] Table 9 shows the results when the protective assembly 40 is in contact with the battery cell 20, and different values ​​are used for the weight M2 of a single battery cell 20 and the N6 / M2 value at the second distance N6, and a collision test is performed on the battery 100 using the collision test method described above.

[0495] Table 9 JPEG0007860245000009.jpg54130

[0496] As shown in Table 9, when N6 satisfies 5mm ≤ N6 ≤ 30mm and N6 / M2 satisfies 0.5mm / Kg ≤ N6 / M2 ≤ 50mm / Kg, battery 100 does not ignite or explode in a collision test of a certain intensity, indicating relatively good safety.

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

[0498] Naturally, the connecting plate 91 is also called an adapter plate, and the connector 92 is also called an adapter.

[0499] As shown in Figures 24 and 25, the connecting plate 91 is a boss extending from one side of the housing 10 along the second direction y, and has a difference in thickness from the bottom wall 102 of the housing 10 in the vertical direction z. The storage section 911 is created by this difference in thickness and is a space formed by the surfaces to which the connecting plate 91 and the housing 10 are connected, and is used to install the connector 92. Installing the connector 92 in the storage section 911 provides protection for the connector 92 and reduces the impact force it receives in collisions.

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

[0501] The intersection of the horizontal and vertical directions means that the extension directions of the connecting plate 91 and the housing 10 exhibit a constant angle, but they must not be parallel to the housing 10, making it easier to install the connector 92 within the storage portion 911 between the connecting plate 91 and the housing 10. In the embodiment of this application, for the sake of clarity, we will use the example that the horizontal and vertical directions are perpendicular. Selectively, the horizontal and vertical directions do not have to be perpendicular.

[0502] In some embodiments, the connector 92 does not extend beyond the extended surface of the bottom wall 102 in the vertical direction. This ensures that the connector 92 is entirely located within the housing 911, avoiding contact with external devices located circumferentially around the battery 100, and reducing the impact on the connector 92 during the process of electrical connection between 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 frames 11b arranged along the periphery of the opening 10c, the frames 11b are connected to each other to form a frame structure, and the connecting plate 91 and the frames 11b are integrally molded.

[0504] In the housing 10, the frame 11b is installed vertically along the mounting member 11a in order from top to bottom. The frame 11b is a plate that extends vertically and is installed surrounding the mounting member 11a, and an opening 10c is formed at the bottom of the housing 10, providing a space inside the housing 10 in which the battery cell 20 can be housed. By extending the connecting plate 91 from one side of the frame 11b and integrally molding it with the frame 11b, the load-bearing strength of the connecting plate 91 can be improved.

[0505] Selectively, the connecting plate 91 does not have to be integrally molded with the frame 11b, and may be fixedly connected to the frame 11b by welding, bonding, fastening members, or a flow-drill screw process. Similarly, the connection between the connecting plate 91 and the mounting member 11a, and between the frame 11b and the mounting member 11a may be integrally molded or fixedly connected by the above methods, and the embodiments of the present application are not limited thereto.

[0506] In some embodiments of the present invention, as shown in Figures 24 and 25, the surface of the connecting plate 91 facing the housing 911 is the first protective surface 911a, the surface of the frame 11b facing the housing 911 is the second protective surface 911b, the connector 92 is connected to the first protective surface 911a, and the connector 92 and the second protective surface 911b are installed with a gap between them.

[0507] Specifically, the first protective surface 911a is the surface of the connecting plate 91 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 closer to the connecting plate 91. 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 and thus protrudes into the storage section 911, but does not come into contact with the second protective surface 911b, reducing the impact that the connecting plate 91 may receive in a collision.

[0508] Selectively, the first protective surface 911a and the second protective surface 911b may be connected perpendicular to each other, i.e., the first protective surface 911a extends along the second direction (the arrangement direction of the multiple battery cells 20) and the second protective surface 911b extends along the vertical direction, thereby making the first protective surface 911a and the second protective surface 911b perpendicular to each other, increasing the mounting space for the connector 92 and maximizing the housing 911.

[0509] In some embodiments, as shown in Figures 24 and 25, in the vertical direction z, the thickness of the connecting plate 91 is a first dimension D5, the extended height of the connector 92 is a second dimension D6, and the extended 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 completely located within the housing 911, thus providing protection for the connector 92.

[0510] In selectable embodiments, the connector 92 may extend along the vertical direction Z and face the extended surface where the bottom wall 102 of the housing 10 is located. This structure allows the connector 92 to be electrically connected to an external device, and provides better load-bearing capacity compared to a connector 92 installed horizontally.

[0511] In some embodiments, as shown in Figures 11, 26, and 27, the housing 10 further includes a bottom cover 12 installed 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, the mounting portion 12b is installed circumferentially on 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 extended surface of the bottom wall 102 relative to the mounting portion 12b, creating a greater distance between the battery cell 20 installed inside the housing 10 and the bottom cover 12. This allows the bus member 24 or other members between the electrode terminals 214 of the battery cell 20 to move away, preventing the bottom cover 12 from becoming too close to the electrode terminals 214 of the battery cell 20. 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 decrease its energy density.

[0513] Furthermore, when the depressurization mechanism 213 is installed facing the bottom wall of the housing cavity 10a, it may also be installed facing the opening 10c. In the event of thermal runaway of the battery cell 20, the depressurization mechanism 213 will eject toward the bottom cover 12. At this time, the structure in which the cover portion 12a protrudes from the extended surface of the bottom portion 102 relative to the mounting portion 12b allows the depressurization mechanism 213 to have a larger ejection space. Moreover, the depressurization mechanism 213 ejects toward the bottom, i.e., the ejection direction is toward the ground, which can improve the safety of the battery 100.

[0514] In some embodiments, the bottom cover 12 and the frame 11b are detachably connected to facilitate the assembly of the battery 100. Exemplarily, as shown in Figures 26 and 27, the bottom cover 12 and the frame 11b may be detachably connected via fastening members 13 such as bolts, or the bottom cover 12 and the frame 11b may be fixedly connected using other methods, 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 top, and the battery cell 20 is connected to the mounting member 11a.

[0516] The mounting member 11a is a plate that extends along the second direction y on the upper part of the housing 10. The mounting member 11a can increase the rigidity of the upper part 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 the upper part of the battery 100, which increases the rigidity of the upper part of the battery 100, reduces the possibility of the battery 100 being damaged in a collision, and improves the safety of the battery 100.

[0517] Selectively, the battery cell 20 may be directly bonded and fixed to the mounting member 11a, or it may be fixed to the mounting member 11a using other methods such as bolt connections, and the embodiments of the present application are not limited thereto.

[0518] In some embodiments, as shown in Figures 24 and 25, the surface of the connecting plate 91 on the side away from the storage portion 911 and the surface of the mounting member 11a on the side 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 on the same plane, so 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, by having one side of the surfaces of the connecting plate 91 and the mounting member 11a located on the same horizontal plane, the load-bearing strength of both can be improved, and the battery 100 has better load-bearing strength.

[0519] The connecting plate 91 protrudes along the vertical z-direction from the extended surface of the bottom wall 102, meaning the connecting plate 91 has a constant thickness in the vertical direction. During a collision, the side of the connecting plate 91 away from the housing 10 may be subjected to a certain impact force, and having a constant thickness improves the rigidity of the connecting plate 91, providing better protection for the connector 92.

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

[0521] In some embodiments, as shown in Figures 11 and 18, the battery 100 includes battery cells 20 and reinforcing elements 30, a mounting member 11a is provided on the upper part of the housing 10, and the multiple battery cells 20 are arranged along a second direction y, i.e., the second direction y is the direction of arrangement of one row of 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 of the multiple 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. In other words, 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 multiple battery cells 20. When the battery cells 20 are installed in a 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 the upper cover of the housing 10 of the battery 100, or it may be part of a power consumption device such as the chassis of the vehicle 1000. If 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, that is, 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 to install the upper cover of the housing of the battery 100, saving the space 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 invention, a reinforcing element 30 is installed in the battery 100, and the reinforcing element 30 is connected to the first wall 201 where the surface area of ​​each battery cell 20 in a plurality of battery cells 20 arranged along a second direction y in a single row is maximized, and the plurality of battery cells 20 are integrally connected via the reinforcing element 30, and in this case, it is not necessary to install side plates inside the battery 100, and it is not necessary to install any further structures such as beams, and the space utilization rate inside the battery 100 can be greatly improved, thereby improving the structural strength and energy density of the battery 100. A mounting member 11a is further installed in the battery 10, and the mounting member 11a is connected to the first outer surface m1 of each battery cell 20 in a plurality of battery cells 20 arranged along the second direction y, and the first outer surface m1 is connected to the first wall 201, and when the battery cell 20 is installed in a power consumption device, the battery cell 20 is located below the mounting member 11a and is 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, eliminating the need to leave a space between the mounting member 11a and the battery cell 20, further improving the space utilization rate inside the battery 10 and increasing the energy density of the battery 100. At the same time, the battery cell 20 is suspended from the mounting member 11a, improving the structural strength of the battery 100. Therefore, the technical solution of the embodiment of the present application can improve the performance of the battery 100.

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

[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 surface 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 ≤ S. / S4 ≤ 30.

[0533] S3 is the total surface area of ​​the side of the reinforcing element 30 that is 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 thermal conductivity will be poor and it will affect the safety performance. If 0.2 ≤ S3 / S4 ≤ 30, the energy density of the battery 100 and the safety performance of the battery 100 can be guaranteed.

[0534] Selectively, the condition 02 ≤ S3 / S4 ≤ 10 is further satisfied, thereby further improving the energy density of battery 100 and ensuring the safety performance of battery 100.

[0535] The specific heat capacity Q of reinforcing element 30 and the weight M3 of reinforcing element 30 are 0.02 kJ / (kg). 2 (°C)≦Q / M3≦100KJ / (kg) 2 The condition Q / M3 < 0.02 kJ / (kg) is satisfied. 2 If the temperature is ( / °C), the reinforcing element 30 will absorb a lot of energy, causing the temperature of the battery cell 20 to drop too low, which could lead to lithium deposition. 2 At temperatures of [temperature]°C, the reinforcing element 30 has low thermal conductivity and cannot quickly dissipate heat. The above design ensures the safety performance of the battery 100.

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

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

[0538] In this case, the mounting member 11a and the protective assembly 40 are also referred to as support plates.

[0539] Selectively, the battery cell 20 may be directly bonded to the mounting member 11a and the protective assembly 40 with an adhesive, or it may be fixedly connected to the mounting member 11a and the protective assembly 40 by other means.

[0540] In conventional battery cells, the pressure reduction mechanism is welded to the battery case, fixing it to the case. If the battery cell experiences thermal runaway, the pressure inside the battery cell is released through the pressure reduction mechanism, thereby improving the safety of the battery cell. For example, if the pressure reduction mechanism is an explosion-proof sheet on the end cover of the battery case, if the battery cell experiences thermal runaway, the explosion-proof sheet will rupture, releasing the waste material inside the battery cell and thus achieving the purpose of releasing the pressure inside the battery cell. However, because the pressure reduction mechanism is welded to the battery case, cracks may develop at the weld site during the long-term use of the battery cell. This reduces the strength of the weld site, and it is easy for the weld site to rupture before the pressure inside the battery cell reaches the detonation pressure of the pressure reduction mechanism, leading to failure of the pressure reduction mechanism and low reliability.

[0541] To improve the reliability of the depressurization mechanism, the inventors, through their research, discovered that the depressurization mechanism and the battery case of the battery cell can be installed as an integrated molded structure, that is, a part of the battery case can be used as the depressurization mechanism. For example, by applying a weakening treatment to a localized area of ​​the end cover, the strength of that area is reduced, creating a weak region and forming an integrated depressurization mechanism, thereby effectively improving the reliability of the depressurization mechanism.

[0542] As a result, 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 inside the battery case 21, a pressure reducing mechanism 213 is installed in the battery case 21, and the pressure reducing mechanism 213 and the battery case 21 are integrally molded to improve the reliability of the pressure reducing mechanism 213.

[0543] In some embodiments, as shown in Figures 48 and 49, the battery case 21 includes integrally molded non-fragile regions 51 and fragile regions 52, a groove 53 is provided in the battery case 21, the non-fragile region 51 is formed around the groove 53, the fragile region 52 is formed at the bottom of the groove 53, the fragile region 52 is positioned to break when the battery cell 20 releases internal pressure, and the depressurization mechanism 213 includes the fragile region 52, thereby further ensuring the reliability of the use of the depressurization mechanism 213.

[0544] The battery case 21 is a component capable of housing the electrode assembly 22 together with other components. The battery case 21 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, and the housing 211 of the outer case may also be the battery case 21. The battery case 21 may be made of a metal material such as copper, iron, aluminum, steel, or aluminum alloy, and the battery case 21 may be made of aluminum laminate film.

[0545] The vulnerable region 52 is a weak area relative to other areas of the battery case. When the internal pressure of the battery cell 20 reaches a threshold, the vulnerable region 52 of the battery case 21 is destroyed, allowing the pressure inside the battery cell 20 to be released. The vulnerable region 52 may be destroyed by methods such as rupture or peeling. For example, when the internal pressure of the battery cell 20 reaches a threshold, the vulnerable region 52 ruptures due to the action of the discharged material (gas, electrolyte, etc.) inside the battery cell 20, allowing the discharged material inside the battery cell 20 to be smoothly released. The vulnerable region 52 may have various shapes, such as rectangular, circular, elliptical, ring-shaped, arc-shaped, U-shaped, or H-shaped. The thickness of the vulnerable region 52 may or may not be uniform.

[0546] The vulnerable region 52 is formed at the bottom of the groove 53, and the groove 53 is formed by a pressing method, achieving integral molding of the vulnerable region 52 and the non-vulnerable region 51. After press-molding the groove 53 into the battery case, the area of ​​the battery case where the groove 53 is installed is thinned, and the vulnerable region 52 is formed accordingly. The groove 53 may be a single-stage groove, and the groove sides of the groove 53 are continuous along the depth direction of the groove 53, for example, the groove 53 is a groove whose internal space exhibits the shape of a rectangular parallelepiped, column, etc. The groove 53 may also be a multi-stage groove, and the multi-stage grooves are arranged along the depth direction of the groove 53, and in adjacent multi-stage grooves, the inner (deeper position) single-stage groove is installed on the groove bottom surface of the outer (shallower position) single-stage groove, for example, the groove 53 is a stepped groove. During molding, multi-stage grooves can be press-formed in stages along the depth direction of the groove portion 53, and the weak region 52 is formed at the bottom of the deepest (innermost) single-stage groove within the multi-stage groove.

[0547] The non-fragile region 51 is formed around the groove 53, and the strength of the non-fragile region 51 is greater than the strength of the fragile region 52, making the fragile region 52 more easily broken than the non-fragile region 51. When the groove 53 is formed in the battery case by a pressing method, the non-fragile region 51 may be the part of the battery case that is not pressed. The thickness of the non-fragile region 51 may or may not be uniform.

[0548] The method for measuring the average grain size can be found in the intercept method described in GB6394-2017, and is therefore omitted from this explanation. When measuring the average grain size of the fragile region 52, the measurement can be taken along the thickness direction of the fragile region 52. When measuring the average grain size of the non-fragile region 51, the measurement can be taken along the thickness direction of the non-fragile region 51.

[0549] In Figure 49, the thickness direction of the vulnerable region 52 and the thickness direction of the non-vulnerable region 51 coincide, and both are in the z-direction.

[0550] The inventors further noted that after an integrated pressure reduction mechanism was formed in the battery case, the mechanical performance of the weak areas of the battery case was poor, and under normal operating conditions of the battery cells, fatigue failure due to long-term changes in the internal pressure of the battery cells was likely to occur in the weak areas, affecting the service life of the battery cells.

[0551] Therefore, in some embodiments, when the average grain size of the fragile region 52 is taken as S1 and the average grain size of the non-fragile region 51 is taken as S2, the condition 0.05 ≤ S1 / S2 ≤ 0.9 is satisfied.

[0552] In the embodiment of the present invention, the fragile region 52 and the non-fragile region 51 are integrally molded and have good reliability. Since S1 / S2 ≤ 0.9, the difference between the average grain size of the fragile region 52 and the average grain size of the non-fragile region 51 is large. By reducing the average grain size of the fragile region 52, the objective of refining the grain size of the fragile region 52 is achieved, improving the material mechanical properties of the fragile region 52, improving the toughness and fatigue strength of the fragile region 52, reducing the risk of the fragile region 52 failing under normal operating conditions of the battery cell 20, and extending the service life of the battery cell 20.

[0553] When S1 / S2 < 0.05, the difficulty of molding the weak region 52 increases, and the strength of the weak region 52 becomes too great, making it difficult for the weak region 52 to break when the battery cell 20 experiences thermal runaway, which can easily lead to a situation where pressure is not released immediately.

[0554] Therefore, when S1 / S2 ≥ 0.05, the difficulty of forming the vulnerable region 52 decreases, 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 or any two of the following range values: 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.

[0556] In some embodiments, when 0.1 ≤ S1 / S2 ≤ 0.5, the overall performance of the battery case 21 is improved, ensuring that the vulnerable region 52 has sufficient strength under normal operating conditions of the battery cell 20, while guaranteeing that the vulnerable region 52 is immediately destroyed when the battery cell 20 experiences thermal runaway.

[0557] For example, S1 / S2 may be any one or any two of the following range values: 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.

[0558] In some examples, 0.4 μm ≤ S1 ≤ 75 μm.

[0559] S1 may be any one of the following values, or a range value between any two of the following values: 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, and 75 μm.

[0560] The inventors noted that when S1 > 75 μm, the toughness and fatigue strength of the weak region 52 are low, and when S1 < 0.4 μm, the difficulty of molding the weak region 52 is high, 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 a situation is likely to occur where pressure is not released immediately.

[0561] Therefore, when 0.4 μm ≤ S1 ≤ 75 μm, on the one hand, the difficulty of molding the weak region 52 is reduced, improving the timely release of pressure when the battery cell 20 experiences thermal runaway, and on the other hand, the toughness and fatigue strength of the weak region 52 are improved, reducing the risk of the weak region 52 failing under normal operating conditions of the battery cell 20.

[0562] In some examples, 1 μm ≤ S1 ≤ 10 μm.

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

[0564] In some embodiments, when 1 μm ≤ S1 ≤ 10 μm, the overall performance of the battery case 21 is improved, ensuring that the vulnerable region 52 has sufficient strength under normal operating conditions of the battery cell 20, while guaranteeing that the vulnerable region 52 is immediately destroyed when the battery cell 20 experiences thermal runaway.

[0565] In some examples, 10 μm ≤ S2 ≤ 150 μm.

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

[0567] Furthermore, 30 μm ≤ S2 ≤ 100 μm.

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

[0569] In some embodiments, the minimum thickness of the vulnerable region is A1, satisfying 1 ≤ A1 / S1 ≤ 100.

[0570] A1 / S1 may be any one of the following ranges: 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 any two of the following ranges.

[0571] When A1 / S1 < 1, the fewer the number of grain size layers in the weak region 52 in the thickness direction, the lower the fatigue strength of the weak region 52 becomes. When A1 / S1 > 100, the more grain size layers in the weak region 52 in the thickness direction, the higher the strength of the weak region 52 becomes, increasing the risk that the weak region 52 will not immediately break down when the battery cell 20 experiences thermal runaway.

[0572] Therefore, when 1 ≤ A1 / S1 ≤ 100, on the one hand, there are many grain size layers in the thickness direction of the weak region 52, improving the fatigue strength of the weak region 52 and reducing the risk of the weak region 52 failing under normal operating conditions of the battery cell 20. On the other hand, when the battery cell 20 experiences thermal runaway, the weak region 52 can be immediately destroyed, achieving the objective of immediately releasing pressure.

[0573] In some examples, 5 ≤ A1 / S1 ≤ 20.

[0574] A1 / S1 may be any one of the following ranges, or any two of the following ranges: 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, and 20.

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

[0576] In some embodiments, the minimum thickness of the weak region is A1, the hardness of the weak region is B1, and the conditions 5HBW / mm ≤ B1 / A1 ≤ 10000HBW / mm are met.

[0577] B1 / A1 may be any one of the following ranges, or any two ranges between them: 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.

[0578] The hardness of the weak region 52 is measured in Brinell hardness, with units of HBW. The Brinell hardness can be measured by referring to the measurement principle in GB / T23.1-2018. In the actual measurement process, the hardness of the weak region 52 can be obtained by measuring the inner or outer surface in the thickness direction of the weak region 52. Taking the example that the battery case is the end cover 11 of the battery cell 20, the hardness of the weak region 52 may be measured on the outer surface away from the inside of the battery cell 20, or the hardness of the weak region 52 may be measured on the inner surface facing the inside of the battery cell 20.

[0579] When B1 / A1 > 10000 HBW / mm, the vulnerable region 52 is thin and hard, making it very brittle. This makes the vulnerable region 52 easily destroyed under normal operating conditions of the battery cell 20, resulting in a shorter service life for the battery cell 20. When B1 / A1 < 5 HBW / mm, the vulnerable region 52 is thick and hard. When the battery cell 20 experiences thermal runaway, the vulnerable region 52 is stretched and compressed, resulting in poor timely pressure release.

[0580] In this embodiment, not only is the effect of the thickness of the vulnerable region 52 on the performance of the battery case considered, but the effect of the hardness of the vulnerable region 52 on the performance of the battery case is also considered. When 5HBW / mm ≤ B1 / A1 ≤ 10000HBW / mm, the vulnerable region 52 has sufficient strength under normal use conditions of the battery cell 20, the vulnerable region 52 is less likely to break due to fatigue, the service life of the battery cell 20 can be extended, and the battery case can immediately release pressure through the vulnerable region 52 when the battery cell 20 experiences thermal runaway, reducing the risk of the battery cell 20 exploding and improving the safety of the battery cell 20.

[0581] In some examples, 190 HBW / mm ≤ B1 / A1 ≤ 4000 HBW / mm.

[0582] B1 / A1 may be any one of the following ranges, or any two ranges between them: 190 HBW / mm, 250 HBW / mm, 280 HBW / mm, 300 HBW / mm, 350 HBW / mm, 400 HBW / mm, 450 HBW / mm, 500 HBW / mm, 600 HBW / mm, 700 HBW / mm, 875 HBW / mm, 1000 HBW / mm, 1200 HBW / mm, 1500 HBW / mm, 1750 HBW / mm, 1800 HBW / mm, 2000 HBW / mm, 2100 HBW / mm, 2500 HBW / mm, 3000 HBW / mm, 3500 HBW / mm, and 4000 HBW / mm.

[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 has sufficient strength under normal operating conditions of the battery cell 20, while guaranteeing that the vulnerable area 52 will be immediately destroyed when the battery cell 20 experiences thermal runaway. The lifespan of the battery cell 20 is extended while ensuring the safety of the battery cell 20.

[0584] In some examples, 0.02 mm ≤ A1 ≤ 1.6 mm.

[0585] A1 may be any one or any two of the following range values: 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.

[0586] When A1 < 0.02 mm, the difficulty of molding the fragile region 52 increases, and the fragile region 52 is more likely to be damaged during the molding process. When the fragile region 52 > 1.6 mm, the fragile region 52 is less likely to be destroyed when the battery cell 20 experiences thermal runaway, and a situation is more likely to occur where pressure is not immediately released.

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

[0588] In some examples, 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 is broken under normal operating 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 may be a situation where 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 region 52 will not be immediately destroyed when the battery cell 20 experiences thermal runaway is reduced, thereby improving the safety of the battery cell 20.

[0597] In some examples, B1 / B2 ≤ 2.5.

[0598] B1 / B2 may be any one or any two of the following range values: 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.

[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 examples, 5HBW ≤ B2 ≤ 150HBW.

[0601] B2 may be any one of the following ranges, or any two ranges between them: 5HBW, 8HBW, 9HBW, 9.5HBW, 10HBW, 15HBW, 16HBW, 19HBW, 20HBW, 30HBW, 40HBW, 50HBW, 52HBW, 52.5HBW, 53HBW, 60HBW, 70HBW, 90HBW, 100HBW, 110HBW, 120HBW, 130HBW, 140HBW, and 150HBW.

[0602] In some examples, 5HBW ≤ B1 ≤ 200HBW.

[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, or 200HBW, or a range value between any two of these.

[0604] In some embodiments, refer to Figures 51 and 52, where Figure 52 is a partially enlarged view of a battery case 21 in another embodiment of the present application. If the minimum thickness of the vulnerable region 52 is A1 and the minimum thickness of the non-vulnerable region 51 is A2, then the condition 0.05 ≤ A1 / A2 ≤ 0.95 is satisfied.

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

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

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

[0608] The groove bottom surface 531 of the groove 53 may be flat or curved. If the groove bottom surface 531 of the groove 53 is flat, it may be parallel to the second side surface 55 or it may be set at a small angle. If the groove bottom surface 531 of the groove 53 and the second side surface 55 are set at a small angle, for example, if the angle between them is 10 degrees or less, the minimum distance between the groove bottom surface 531 of the groove 53 and the second side surface 55 is the minimum thickness of the vulnerable region 52. As shown in Figure 51, if the groove bottom surface 531 of the groove 53 and the second side surface 55 are parallel, the distance between the groove bottom surface 531 of the groove 53 and the second side surface 55 is the minimum thickness of the vulnerable region 52. As shown in Figure 52, if the groove bottom surface 531 of the groove is a curved surface, for example, if the groove bottom surface 531 of the groove 53 is an arcuate surface, the minimum distance between the groove bottom surface 531 of the groove 53 and the second side surface 55 is the minimum thickness of the vulnerable region 52.

[0609] A1 / A2 may be any one of the following ranges, or any two of the following ranges: 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.

[0610] When A1 / A2 < 0.05, there is a possibility that the strength of the vulnerable region 52 will be insufficient. When A1 / A2 > 0.95, there is a possibility that the vulnerable region 52 will not be easily destroyed even if the battery cell 20 experiences thermal runaway, and if the pressure is not released immediately, it will cause the battery cell 20 to explode. Therefore, when 0.05 ≤ A1 / A2 ≤ 0.95, it is possible to reduce not only the probability that the vulnerable region 52 will rupture under normal operating conditions of the battery cell 20, but also the probability that an explosion will occur when the battery cell 20 experiences thermal runaway.

[0611] In some examples, 0.12 ≤ A1 / A2 ≤ 0.8.

[0612] A1 / A2 may be any one or any two of the following range values: 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.

[0613] In some embodiments, when 0.12 ≤ A1 / A2 ≤ 0.8, the overall performance of the external components is improved, ensuring that the vulnerable region 52 has sufficient strength under normal operating conditions of the battery cell 20, while guaranteeing that the vulnerable region 52 will immediately break down when the battery cell 20 experiences thermal runaway. When forming the groove 53 by pressing, S1 / S2 ≤ 0.5 can be easily achieved by controlling A1 / A2 between 0.12 and 0.8, thereby achieving the objective of refining the crystal grain size of the vulnerable region 52.

[0614] In some examples, 0.2 ≤ A1 / A2 ≤ 0.5.

[0615] A1 / A2 may be any one or any two of the following range values: 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.

[0616] In this embodiment, controlling A1 / A2 between 0.2 and 0.5 provides a reinforcing effect on the weak region 52 by refining the grain size, which is superior to the weakening effect on the weak region 52 by reducing the thickness. As a result, the weak region 52 has better fatigue resistance, further reducing the risk of the weak region 52 failing under normal operating conditions of the battery cell 20, and ensuring that the weak region 52 fails immediately when the battery cell 20 experiences thermal runaway, thereby improving the timeliness of pressure release.

[0617] In some examples, 0.02 mm ≤ A1 ≤ 1.6 mm. Furthermore, 0.06 mm ≤ A1 ≤ 0.4 mm.

[0618] In some embodiments, 1 mm ≤ A2 ≤ 5 mm. A2 may be any one or any two of the following range values: 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm.

[0619] When A2 > 5mm, the thickness of the non-fragile region 51 is large, requiring more material for the battery case, resulting in a heavier battery case and poor economic efficiency. When A2 < 1mm, the thickness of the non-fragile region 51 is small, resulting in low deformation resistance of the battery case. Therefore, when 1mm ≤ A2 ≤ 5mm, the battery case offers good economic efficiency and good deformation resistance.

[0620] Furthermore, 1.2mm ≤ A2 ≤ 3.5mm.

[0621] A2 may be any one or any two of the following range values: 1.2mm, 1.25mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm.

[0622] In this embodiment, when 1.2mm ≤ A2 ≤ 3.5mm, the battery case exhibits good economic efficiency and deformation resistance. Furthermore, when 2mm ≤ A2 ≤ 3mm, the battery case is also suitable.

[0623] In some embodiments, refer to Figure 53, which is a schematic diagram of the structure of a battery case 21 according to another embodiment of the present application (showing a single-stage shallow groove 532). Figure 54 is an EE cross-sectional view of the battery case 21 shown in Figure 53. Figure 55 is a schematic diagram of the structure of a battery case 21 according to another embodiment of the present application (showing a single-stage shallow groove 532). Figure 56 is an FF cross-sectional view of the battery case shown in Figure 55. Figure 57 is a schematic diagram of the structure of a battery case according to another embodiment of the present application (showing a single-stage shallow groove 532). Figure 58 is a GG cross-sectional view of the battery case shown in Figure 53. The battery case 21 has a pressure reduction region 56, the groove 53 includes a single-stage shallow groove 532, the shallow groove 532 is installed along the edge of the pressure reduction region 56, the pressure reduction region 56 is arranged so that it can be opened with the shallow groove 532 as the boundary, and a vulnerable region 52 is formed at the bottom of the shallow groove 532.

[0624] The depressurized area 56 is an area of ​​the battery case that can be opened after the vulnerable area 52 is destroyed. For example, when the internal pressure of the battery cell 20 reaches a threshold, the vulnerable area 52 ruptures, and the depressurized area 56 is opened outward under the action of the discharge from inside the battery cell 20. Once the depressurized area 56 is opened, the battery case can form an outlet at the location corresponding to the depressurized area 56, and the discharge from inside the battery cell 20 is discharged through the outlet, thereby releasing the pressure inside the battery cell 20.

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

[0626] In this embodiment, the vulnerable region 52 is formed at the bottom of the shallow groove 532, and when the vulnerable region 52 is destroyed, the depressurized region 56 can be opened with the vulnerable region 52 as its boundary, thereby releasing pressure and increasing the pressure release area of ​​the battery case.

[0627] In some embodiments, referring again to Figures 54, 56, and 58, the battery case 21 has a first side surface 54 and a second side surface 55 that are positioned opposite each other, and the shallow groove 532 is recessed in the direction from the first side surface 54 toward the second side surface 55.

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

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

[0630] In this embodiment, the groove 53 includes only one shallow groove 532, the shallow groove 532 is the groove 53, and the groove 53 is a single groove, resulting in a simple structure. During molding, the shallow groove 532 can be formed on the first side surface 54, making molding easy, improving production efficiency, and reducing production costs.

[0631] In some embodiments, refer to Figures 59 to 64, where Figure 59 is a schematic diagram of the structure of a battery case 21 according to another embodiment of the present application (showing a two-stage shallow groove 532). Figure 60 is a KK cross-sectional view of the battery case 21 shown in Figure 59. Figure 61 is a schematic diagram of the structure of a battery case according to another embodiment of the present application (showing a two-stage shallow groove 532). Figure 62 is an MM cross-sectional view of the battery case shown in Figure 61. Figure 63 is a schematic diagram of the structure of a battery case according to another embodiment of the present application (showing a two-stage shallow groove 532). Figure 64 is an NN cross-sectional view of the battery case shown in Figure 63. The battery case 21 includes a first side surface 54 and a second side surface 55 that are installed opposite each other, the groove 53 includes a multi-stage shallow groove 532, the multi-stage shallow groove 532 is installed sequentially in the battery case along the direction from the first side surface 54 to the second side surface 55, and the vulnerable region 52 is formed at the bottom of the single-stage shallow groove 532 furthest from the first side surface 54. The battery case has a pressure-reducing region 56,...

Claims

1. Including the housing and the battery cells, A housing cavity is provided within the housing, the housing cavity includes a ceiling wall and a bottom wall installed facing each other in the vertical direction, the battery cell is provided within the housing cavity, the battery cell includes an electrode assembly and electrode terminals, the electrode assembly is electrically connected to the electrode terminals, the battery cell is fixed within the housing cavity, and the electrode terminals are positioned to face the bottom wall of the housing cavity. The housing includes a main body and a bottom cover installed at the bottom of the main body, and the bottom cover and the main body are sealed together and form a sealed housing cavity. The wall of the bottom cover facing the battery cell constitutes the bottom wall of the housing cavity. A mounting member is provided on the upper part of the housing, and the battery cell is provided on the surface of the mounting member. The aforementioned battery cell is bonded to the aforementioned mounting member, forming a battery.

2. The battery according to claim 1, wherein the wall of the mounting member facing the battery cell constitutes the ceiling wall of the housing cavity.

3. The battery according to claim 1, 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.

4. The battery according to claim 1, wherein the mounting member is used to define the housing cavity, and the battery cell is suspended from the mounting member.

5. The battery according to claim 1, wherein the battery cells are a plurality, the plurality of 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 the ceiling wall of the plurality of 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.

6. The battery according to claim 5, wherein a cavity is installed inside the mounting member.

7. The battery according to claim 6, wherein the cavity is used to house a heat exchange medium for regulating the temperature of the battery cell.

8. The battery according to claim 1, wherein the housing includes a bottom cover and a frame, the frame is formed to enclose an enclosed space that is installed penetrating both ends in the vertical direction, the bottom cover and the aforementioned mounting member each cover the opposing ends in the vertical direction of the enclosed space, and the housing cavity enclosed by the bottom cover, the frame and the aforementioned mounting member is formed.

9. The battery according to claim 1, wherein the battery cell is placed inverted within the housing in such a manner that its end cover faces the bottom wall, a pressure reducing mechanism and electrode terminals are installed on the end cover, and both the pressure reducing mechanism and electrode terminals are installed facing the bottom wall.

10. Further including connecting plates and connectors, The battery according to claim 1, wherein the connecting plate is installed protruding horizontally from one side of the housing, the connecting plate and the bottom wall form a storage compartment in the vertical direction, the connector is installed in the storage compartment and connected to the connecting plate, and the connector is electrically connected to the battery cell.

11. Further includes protective assemblies, The battery according to claim 1, wherein the protective assembly is installed between the battery cell and the bottom wall, thereby supporting and supporting the battery cell.

12. Further including bus components, The battery according to claim 11, wherein the bus member is used to electrically connect to the electrode terminals of at least two of the battery cells, the protective assembly is installed between the bottom wall and the bus member, and the protective assembly is installed to insulate the battery cells from the bottom wall.

13. The battery according to claim 11, wherein the protective assembly includes a protective strip, the protective strip contacts the battery cell.

14. The battery according to claim 13, wherein a plurality of protective strips are installed, the plurality of protective strips are installed at intervals 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.

15. The battery according to claim 13, wherein the protective assembly further includes a main plate, the protective strip is connected to the main plate, and the main plate is located between the protective strip and the bottom wall.

16. The battery according to claim 13, wherein the end cover of the battery cell includes a functional region and a shoulder portion, the electrode terminals are installed in the functional region, the shoulder portion is located on both sides of the functional region along a second direction, the battery cell abuts the protective strip via the shoulder portion, and the second direction is perpendicular to the vertical direction.

17. The battery according to claim 13, wherein in the vertical direction, the thickness of the protective strip is greater than the elongated height of the portion of the electrode terminal exposed from the battery cell.

18. The battery according to claim 13, wherein the protective strip is in contact with the electrode terminals, or the protective strip and the electrode terminals are installed with a gap between them.

19. The battery according to claim 14, wherein the orthographic projection of the electrode terminal on the bottom wall is located between the orthographic projections of the adjacent protective strip on the bottom wall.

20. The battery according to claim 14, wherein the electrode terminals of two adjacent battery cells are electrically connected via a bus member, and in the second direction, the extended length of one of the two adjacent protective strips is shorter than the extended length of the other, thereby forming a relief notch, the relief notch is used to give way to the bus member.

21. The battery according to claim 14, wherein the battery cell further includes a pressure reducing mechanism, the pressure reducing mechanism is located on the same side as the electrode terminals, and the orthographic projection of the pressure reducing mechanism on the bottom wall is located between the orthographic projections on the bottom wall of the adjacent protective strip.

22. The battery according to claim 1, wherein the battery cell further includes a battery case, the electrode assembly is housed within 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.

23. The battery according to claim 22, wherein the battery case includes integrally molded non-fragile regions and fragile regions, 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 break when the battery cell releases internal pressure, and the pressure reduction mechanism includes the fragile region.

24. The battery according to 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.

25. 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 is a ternary material, dLi ２ MnO ３ ・(1-d) LiMO ２ and LiMPO ４ The battery according to claim 1, comprising at least one of the following, wherein 0 < d < 1, and M comprises one or more selected from Fe, Ni, Co, and Mn, and the shell comprises a crystalline inorganic material, the crystalline inorganic material having a full width at half maximum of the main peak measured by X-ray diffraction of 0 to 3°, and the crystalline inorganic material comprises one or more metal oxides and inorganic salts.

26. 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, and the positive electrode active material is LiMPO ４ It has, and the M includes Mn and a non-Mn element, the non-Mn element is If the ionic radius of the non-Mn element is a and the ionic radius of the manganese element is b, then condition 1 is that |a - b| / b is 10% or less. When the valence change voltage of the non-Mn element is denoted as U, condition 2 is that 2V < U < 5.5V, Condition 3 states that the chemical activity of the chemical bond formed from the non-Mn element and O is greater than or equal to the chemical activity of the P-O bond. The battery according to claim 1, satisfying at least one of the conditions 4, wherein the highest value number of the non-Mn element is 6 or less.

27. A power consumption device including a battery according to claim 1 for supplying electrical energy.

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