Batteries and power consumption devices

Abstract

This application provides a battery and a power consumption device, and belongs to the battery technology field. The battery includes a housing having a cavity, a group of battery cells housed in the cavity, the group of battery cells comprising a plurality of arranged battery cells, and a support plate mounted in the cavity, the group of battery cells being attached to the support plate so that the support plate can support the plurality of battery cells, and the support plate being installed in isolation from the housing.

Description

[Technical Field]

[0001] Cross-reference of related applications This application is filed pursuant to the Chinese patent application No. 202311419402.0, filed on 30 October 2023, claiming priority from said Chinese patent application, and all contents of said Chinese patent application are incorporated into this application by reference.

[0002] (Technical field) This application relates to the battery technology field, and more specifically to batteries and power consumption devices. [Background technology]

[0003] Generally, in batteries, an equipotential design is employed between the housing and the support plate of the battery cell group. If one battery cell malfunctions, the insulation design between the battery cell and the support plate is compromised, resulting in the support plate, housing, and battery cells being at the same potential. Furthermore, high-temperature exhaust gases can compromise the insulation design of the high-voltage components of the remaining battery cells, leading to ignition with the housing and resulting in a two-point insulation failure, posing a safety hazard. [Overview of the project] [Problems that the invention aims to solve]

[0004] This application provides a battery and power consumption device to solve the problem of a scenario in which thermal runaway in one battery cell within the battery easily leads to a two-point insulation failure within the battery, which poses a safety risk. [Means for solving the problem]

[0005] According to the first aspect, an embodiment of the present application provides a battery, the battery is, A housing having a cavity, A group of battery cells housed in the cavity, wherein the group of battery cells includes a plurality of arranged battery cells, A support plate is installed within the cavity, and the battery cell group includes a support plate attached to the support plate so that the support plate can support a plurality of the battery cells, and the support plate is installed in isolation from the housing.

[0006] The above proposed technology can reduce the probability of two-point insulation failure in the event of thermal runaway in a battery cell, thereby improving battery safety.

[0007] In some embodiments, the insulation resistance between the support plate and the housing is R1, and R1 ≥ 1 MΩ.

[0008] The above proposed technology satisfies the insulation requirements between the battery cell and the housing, resulting in superior insulation, reduced failure probability, and ensuring battery safety.

[0009] In some embodiments, the support plate includes a plastic member.

[0010] In the above proposed technology, by installing a support plate made of plastic material, excellent insulation effect is achieved, manufacturing costs are low, installation is easy, and the scale of production can be easily expanded.

[0011] In some embodiments, the support plate is connected to the housing.

[0012] In the above proposed technology, the overall structural strength of the battery is increased by connecting the support plate to the housing, thereby improving stability during use.

[0013] In some embodiments, the support plate includes a first portion and a second portion connected to each other, the battery cell group is attached to the first portion, the second portion is connected to the housing, the first portion is a metal member, and the second portion is a plastic member.

[0014] In the above technical solution, by installing the support plate as the first part and the second part, the first part can perform heat exchange with the battery cell group to improve the stability of the battery cell group, and the second part is a plastic member, so it can exert an effective insulation effect.

[0015] In some embodiments, a protrusion is installed on one of the first part and the second part, and a groove is installed on the other, and by fitting the protrusion into the groove, the first part and the second part are connected to each other.

[0016] In the above technical solution, by installing the protrusion and the groove to connect the first part and the second part, the connection strength between the first part and the second part is increased, and the overall structural strength is increased.

[0017] In some embodiments, the first part includes a main board body and the protrusion protruding from the outer peripheral surface of the main board body towards the second part, the battery cell group is attached to the main board body, the thickness of the protrusion is smaller than the thickness of the main board body, the second part is installed around the main board body, and the groove is on the side of the second part facing the first part.

[0018] In the above technical solution, by installing the protrusion and the groove, the connection strength between the first part and the second part is increased, the overall structural strength of the support plate is increased, and the stability during battery use can be improved.

[0019] In some embodiments, the support plate is provided with mounting holes, and the mounting holes are used to connect the support plate and the housing by passing a fastener through them. The mounting hole penetrates the second part along the thickness direction of the support plate. Or, The mounting hole penetrates the protrusion and the second part along the thickness direction of the support plate.

[0020] In the above technical solution, the connection strength between the support plate and the housing is higher and the stability is better. In some embodiments, the support plate is a metal member, the support plate is installed spaced apart from the housing, and a connecting plate is installed between the side of the support plate away from the battery cell group and the housing, the connecting plate is an insulating member and is connected to the support plate and the housing, respectively.

[0021] In the above proposed technology, by installing a connecting plate, the difficulty of manufacturing and processing is reduced, assembly is easy, manufacturing costs are reduced, and the probability of two-point insulation failure of the battery is reduced, thereby improving safety performance.

[0022] In some embodiments, a plurality of support plates are installed, the plurality of support plates are spaced apart from each other, and each support plate supports at least one group of battery cells.

[0023] The above proposed technology improves the safety performance of the battery by reducing the probability of short circuits and high-voltage breakdowns in the battery through the installation of multiple support plates.

[0024] In some embodiments, multiple battery cell groups are installed, and these multiple battery cell groups are installed in a one-to-one correspondence with multiple support plates.

[0025] The above proposed technology facilitates the arrangement and assembly of battery cell groups and support plates, increases the density of multiple battery cells on the support plate, and makes management easier.

[0026] In some embodiments, at least one of the connecting plates has a projection that extends into the gap between two adjacent support plates.

[0027] In the above proposed technology, by installing protrusions on the connecting plate, the insulation design between different support plates becomes more stable, improving the safety performance of the battery.

[0028] In some embodiments, the insulation resistance between two adjacent support plates is R2, and R2 ≥ 1 kΩ.

[0029] In the above proposed technology, the insulation effect between different support plates is ensured and the safety of the battery is improved by limiting the minimum value of the insulation resistance R2 between two adjacent support plates.

[0030] In some embodiments, in the same group of battery cells mounted on the same support plate, the potential difference between the cases of two adjacent battery cells is U i U i The voltage must be ≤50V.

[0031] In the above proposed technology, the potential difference U between the cases of the two battery cells i By setting a maximum value, the probability of ignition is reduced, and the safety of the battery is improved.

[0032] In some embodiments, U i The voltage is ≤20V.

[0033] In the above proposed technology, the potential difference U between the cases of two adjacent battery cells in the same battery cell group on the same support plate is i Further limiting the scope reduces the risk of ignition.

[0034] In some embodiments, in the same group of battery cells mounted on the same support plate, the maximum potential difference between the cases of two adjacent battery cells is U max The volumetric energy density of the battery cell is E,

number

[0035] In the above technical proposal, E*U max By limiting the maximum and minimum values, the probability of thermal runaway occurring when two battery cells experience thermal runaway is reduced, while also ensuring high cost-effectiveness for the battery.

[0036] In some embodiments, 300Wh / L ≤ E ≤ 800Wh / L, 3.5V ≤ U maxIt is ≤ 50V.

[0037] In the above technical solution, by limiting the maximum value U of the potential difference between the cases of two adjacent battery cells max and the range of the volume energy density E of the battery cell, the cost performance of the battery cell can be increased, and ignition is not easily caused.

[0038] In some embodiments,

Number

[0039] In the above technical solution, by further limiting the range of E*U max and U max , the safety of the battery is further improved.

[0040] In some embodiments, a flow path for the heat exchange medium to flow is provided in the support plate, the heat exchange medium is used to adjust the temperature of the battery cell, the flow paths of the plurality of support plates communicate through a connection part, and the connection part is an insulating member.

[0041] In the above technical solution, when ensuring the insulation design, by communicating the flow paths of each support plate, the thermal management design of the battery cell becomes easy.

[0042] In some embodiments, in two adjacent battery cell groups attached to two adjacent support plates, the maximum potential difference between the cases of two adjacent battery cells belonging to two adjacent battery cell groups and adjacent to each other is U1, and the resistance of the heat exchange medium in the connection part is R3. 0.05V / KΩ ≤ U1 / R3 ≤ 400V / KΩ is satisfied, where R3 = ρL / S, ρ is the conductivity of the heat exchange medium, L is the length that the heat exchange medium flows in the connection part, and S is the flow cross-sectional area of the connection part.

[0043] The above proposed technology ensures safety performance when connection points are installed and controls manufacturing costs by limiting the range of U1 / R3.

[0044] In some embodiments, 50V ≤ U1 ≤ 400V and 1kΩ ≤ R3 ≤ 1000kΩ. The above proposed technology improves the safety performance of the battery and controls the manufacturing and design costs of the battery by limiting the range of values ​​for U1 and R3.

[0045] In some embodiments, 0.05V / kΩ ≤ U1 / R3 ≤ 200V / kΩ.

[0046] The above proposed technology enhances battery safety by limiting the range of U1 / R3 values.

[0047] In some embodiments, the side wall of the battery cell on which the pressure release mechanism is provided is connected to the support plate, and the support plate has a relief structure installed opposite the pressure release mechanism.

[0048] In the above proposed technology, by installing a relief structure on the support plate, the pressure release mechanism can be opened smoothly, thereby improving the safety performance of the battery.

[0049] In some embodiments, the relief structure corresponds one-to-one with the pressure release mechanism, Alternatively, each of the relief structures corresponds to a plurality of the pressure release mechanisms.

[0050] In some embodiments, the relief structure includes through holes provided in the support plate.

[0051] In the above proposed technology, safety is ensured by installing through holes to effectively release the pressure from the pressure release mechanism.

[0052] In some embodiments, the relief structure includes a relief groove provided in the support plate, the opening of which faces the pressure release mechanism.

[0053] In the above proposed technology, safety is ensured and the difficulty of machining is reduced by installing relief grooves to effectively allow the operation of the pressure release mechanism to be relieved.

[0054] In some embodiments, the depth of the relief groove is H, satisfying 2 mm ≤ H ≤ 10 mm, and / or the thickness of the bottom wall of the relief groove is h, satisfying 0.1 mm ≤ h ≤ 2 mm.

[0055] In the above proposed technology, the design parameters of the relief groove are limited to ensure that the pressure release mechanism can operate normally, thereby ensuring the safety of the battery.

[0056] In some embodiments, the support plates are installed in multiple configurations, the multiple support plates are spaced apart from each other, and the relief structure includes a relief gap between two adjacent support plates.

[0057] In the above proposed technology, by providing a relief gap to allow the pressure release mechanism to function, manufacturing and processing are simple, which is advantageous in reducing manufacturing costs.

[0058] According to a second aspect, an embodiment of the present application provides a power consumption device, the power consumption device is Includes a battery as described in any of the above embodiments for providing electrical energy.

[0059] In the above proposed technology, by using the battery described in the above embodiment, the probability of two-point insulation failure occurring when the battery cells within the battery experience thermal runaway is reduced, thereby improving the safety of the battery and further improving the safety and stability during use of the power consumption device.

[0060] (Brief explanation of the drawing) To more clearly explain the technical concept of the embodiments of this application, the following briefly introduces the drawings necessary for the embodiments. It should be understood that these drawings only show a limited number of embodiments of this application and should not be considered limiting in scope. Those skilled in the art can obtain other relevant drawings based on these drawings without requiring any creative effort. [Brief explanation of the drawing]

[0061] [Figure 1] This is a schematic diagram of the structure of a vehicle according to several embodiments of this application. [Figure 2] This is exploded view 1 of the structure of a battery according to several embodiments of this application. [Figure 3] This is schematic diagram 1 of the cross-sectional structure of a battery according to several embodiments of this application. [Figure 4] This is exploded view 2 of the battery structure according to several embodiments of this application. [Figure 5] This is schematic diagram 2 of the cross-sectional structure of a battery according to several embodiments of this application. [Figure 6] This is a magnified view of area A in Figure 5. [Figure 7] Figure 3 shows a schematic cross-sectional structure of a battery according to several embodiments of this application. [Figure 8] This is a magnified view of area B in Figure 7. [Figure 9] This is exploded view 3 of the battery structure according to several embodiments of this application. [Figure 10] Figure 4 shows a schematic cross-sectional structure of a battery according to several embodiments of this application. [Figure 11] This is exploded view 4 of the battery structure according to several embodiments of this application. [Figure 12] Figure 5 shows a schematic cross-sectional structure of a battery according to several embodiments of this application. [Figure 13] This is a magnified view of area C in Figure 12. [Figure 14] Figure 6 shows a schematic cross-sectional structure of a battery according to several embodiments of this application. [Figure 15] This is a magnified view of area D in Figure 14. [Figure 16] Figure 5 shows the exploded structure of a battery according to several embodiments of this application. [Figure 17] Figure 7 shows a schematic cross-sectional structure of a battery according to several embodiments of this application. [Figure 18] This is exploded view 6 of the battery structure according to several embodiments of this application. [Figure 19] This is exploded view 1 of a partial structure of a battery according to several embodiments of this application. [Figure 20] This is exploded view 2 of a partial structure of a battery according to several embodiments of this application. [Figure 21] This is exploded view 3 of a partial structure of a battery according to several embodiments of this application. [Figure 22] This is schematic diagram 1 of a partial cross-sectional structure of a battery according to several embodiments of this application. [Figure 23] This is a magnified view of point E in Figure 22. [Figure 24] This is exploded view 4 of a partial structure of a battery according to several embodiments of this application. [Figure 25] Figure 5 shows an exploded view of a partial structure of a battery according to several embodiments of this application.

[0062] (Explanation of symbols) Vehicle 1, Battery 10, Motor 20, Controller 30, Battery cell group 11, battery cell 111, pressure release mechanism 1111, Enclosure 12, bottom plate 121, top cover 122, frame 123, cavity 124, Support plate 13, first part 131, main plate body 1311, projection 1312, second part 132, mounting hole 1321, flow path 133, relief structure 134, through hole 1341, relief groove 1342, relief gap 1343, Connecting plate 14, projection 141, Connection part 15. [Modes for carrying out the invention]

[0063] To further clarify the purpose, technical proposal and advantages of the embodiments of this application, the technical proposal of the embodiments of this application will be clearly described below with reference to the drawings of the embodiments of this application. Clearly, the embodiments described are some, but not all, embodiments of this application. All other embodiments that a person skilled in the art can obtain without creative effort based on the embodiments of this application are within the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as that commonly understood by those skilled in the art relating to this application. In this application, terms used in the specification are intended solely to describe specific embodiments and are not intended to limit this application. The terms “includes” and “has” and any variations thereof in the specification and claims of this application, as well as in the description of the drawings, are intended to intentionally cover non-exclusive “includes.” Terms such as “first,” “second,” etc., in the specification and claims of this application or in the drawings are not intended to indicate a particular order or subordination, but to distinguish different subjects.

[0065] The “Examples” as used in this application mean that certain features, structures, or properties described with reference to the Examples may be included in at least one Example of this Application. The phrase “Examples” appearing in various parts of the Specification does not necessarily refer to the same Example, nor do they represent mutually exclusive, independent, or alternative Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described in this Application can be combined with other Examples.

[0066] In the description of this application, unless otherwise specifically defined and limited, the terms “attachment,” “connection,” “linking,” and “adhesion” should be understood in a broad sense, for example, a fixed connection, a removable or integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0067] The term "and / or" in this application is merely used to describe the relationship between related objects, indicating that three relationships are possible. For example, A and / or B can represent three situations: A existing alone, A and B existing simultaneously, or B existing alone. The letter " / " in this application generally indicates that the preceding and following related objects are in an "or" relationship.

[0068] In this application, "multiple" means two or more (including two), similarly, "multiple groups" means two or more groups (including two groups), and "multiple sheets" means two or more (including two sheets).

[0069] The battery cells referred to in the embodiments of this application may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The battery cells may be cylindrical, flat, rectangular, or have other shapes, but are not limited to, the embodiments of this application. Battery cells are generally classified into three types based on their packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but are not limited to, the embodiments of this application.

[0070] The batteries referred to in the embodiments of this application refer to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the batteries referred to in this application may include battery modules or battery packs. The batteries generally include a housing for packaging one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging and discharging of the battery cells.

[0071] A battery cell comprises a case, an electrode assembly, and an electrolyte. The case is used to house the electrode assembly and the electrolyte. 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 comprises a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. A positive electrode current collector without the positive electrode active material layer protrudes from a positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer functions as a 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. Negative electrode current collectors without the negative electrode active material layer protrude from negative electrode current collectors with the negative electrode active material layer, and these negative electrode current collectors without the negative electrode active material layer function as negative electrode tabs. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that they do not melt even when a large current flows, there are multiple positive electrode tabs, which are stacked, and there are also multiple negative electrode tabs, which are stacked.

[0072] The separator material may be PP (Polypropylene) or PE (Polyethylene), etc. Furthermore, the electrode assembly may have a wound structure or a laminated structure, and is not limited to these in the embodiments of this application.

[0073] In recent years, new energy vehicles have developed dramatically, and in the field of electric vehicles, power batteries play an indispensable and crucial role as the power source for electric vehicles. A battery consists of a housing and multiple battery cells housed within it. Here, as a core component of new energy vehicles, batteries have high requirements in terms of both safety and cycle life.

[0074] In typical batteries, an equipotential design is employed between the casing and the support plate for the battery cell group. If one battery cell malfunctions, the insulation design between the battery cell and the support plate is compromised, resulting in the support plate, casing, and battery cells all being at the same potential. Furthermore, high-temperature exhaust gases can compromise the insulation design of the high-voltage components of the remaining battery cells, leading to ignition with the casing and causing a two-point insulation failure, which poses a safety hazard.

[0075] Based on the above considerations, in order to solve the problem that thermal runaway of one battery cell in the battery can easily lead to a two-point insulation failure scenario within the battery, which poses a safety hazard, this application designs a battery comprising a housing, a support plate, and a group of battery cells, wherein the housing has a cavity, the group of battery cells is housed within the cavity, the group of battery cells includes a plurality of arranged battery cells, the support plate is mounted within the cavity, the group of battery cells is mounted on the support plate so that the support plate supports the plurality of battery cells, and the support plate is installed insulated from the housing.

[0076] In batteries with this structure, the support plate and the housing are installed insulated from each other. Therefore, even if an insulation failure occurs between the battery cell and the support plate, the insulating installation between the support plate and the housing makes it difficult for the battery cell to communicate with the housing. This reduces the possibility of a two-point insulation failure and improves the safety performance of the battery.

[0077] Embodiments of this application provide a power consumption device that uses a battery as a power source, and the power consumption device may be, but is not limited to, a mobile phone, tablet, laptop computer, electric toy, power tool, electric motorcycle, electric car, ship, or spacecraft. Here, electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft may include aircraft, rockets, space shuttles, and spacecraft, etc.

[0078] In the following embodiments, for the sake of clarity, the power consumption device of one embodiment of this application will be described as a vehicle 1 as an example.

[0079] As shown in Figure 1, this is a schematic diagram of the structure of a vehicle 1 according to one embodiment of the present application, and the vehicle 1 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 20, a controller 30, and a battery 10 may be installed inside the vehicle 1, and the controller 30 is used to control the battery 10 and supply power to the motor 20. For example, the battery 10 may be installed at the bottom, front, or rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1, for example, as an operating power source for the vehicle 1, it may be used for the circuit system of the vehicle 1, for example, for the operating power needs of the vehicle 1 during startup, navigation, and driving. In another embodiment of the present application, the battery 10 can not only function as an operating power source for the vehicle 1, but can also provide driving power to the vehicle 1 as a driving power source for the vehicle 1, replacing or partially replacing fuel oil or natural gas.

[0080] To meet different power usage needs, the battery 10 may include multiple battery cells 111, where the multiple battery cells 111 may be connected in series, in parallel, or in series-parallel, with series-parallel connection meaning a mixture of series and parallel connections.

[0081] Figure 2 is an exploded view of the structure of a battery 10 according to one embodiment of the present application. The battery 10 includes a housing 12 and a plurality of battery cells 111, the battery cells 111 being used to house within the housing 12. Here, the housing 12 is used to provide assembly space for the battery cells 111, and the housing 12 can employ various structures. In some embodiments, the housing 12 may include a bottom plate 121, a top cover 122, and a frame 123, the frame 123 may be a hollow structure with open ends, the bottom plate 121 and the top cover 122 are placed over the open sides of the frame 123, the bottom plate 121, the top cover 122, and the frame 123 jointly define a cavity 124, the cavity 124 is an assembly space for housing the battery cells 111. Of course, the housing 12 formed by the bottom plate 121, the top cover 122, and the frame 123 may have various shapes such as a cylinder or a rectangular parallelepiped.

[0082] In the battery 10, the multiple battery cells 111 may be connected in series, in parallel, or in series-parallel connection, where series-parallel connection means that the multiple battery cells 111 are connected in both series and parallel. The multiple battery cells 111 may be directly connected in series, in parallel, or in series-parallel connection, and then the entire assembly of the multiple battery cells 111 may be housed in the housing 12. Of course, the battery 10 may first form a battery cell group 11 by connecting the multiple battery cells 111 in series, in parallel, or in series-parallel connection, and then form the whole assembly by connecting the multiple battery cell group 11 in series, in parallel, or in series-parallel connection, and then housed in the housing 12. The battery 10 may further include other structures, for example, the battery 10 may further include busbar members for realizing electrical connections between the multiple battery cells 111.

[0083] Referring to Figure 2, the battery 10 includes a plurality of battery cell groups 11, each of which contains a plurality of battery cells 111. The battery cells 111 of each battery cell group 11 are arranged along a first direction X, and the plurality of battery cell groups 11 are arranged along a second direction Y. The first direction X and the second direction Y are the longitudinal direction and the width direction of the housing 12, respectively, and the first direction X and the second direction Y are perpendicular to each other.

[0084] Here, each battery cell 111 may be a secondary battery or a primary battery, and may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 111 may be cylindrical, flattened, rectangular, or have other shapes. Exemplarily, in Figure 3, the battery cell 111 is rectangular in shape.

[0085] According to some embodiments of this application, as shown in Figures 2 to 25, referring to Figure 2, an embodiment of this application provides a battery 10, which may include a housing 12, a group of battery cells 11, and a support plate 13.

[0086] The housing 12 may have a cavity 124, the battery cell group 11 may be housed in the cavity 124, the battery cell group 11 may include a plurality of arranged battery cells 111, the support plate 13 may be mounted in the cavity 124, the battery cell group 11 may be mounted on the support plate 13 so that the support plate 13 supports the plurality of battery cells 111, and the support plate 13 may be installed insulated from the housing 12.

[0087] The housing 12 may be the housing 12 of the previously described embodiment, and repeated explanations will be omitted here. In this embodiment, the housing 12 may be installed in a rectangular parallelepiped. The battery cell group 11 may be housed in the cavity 124, and the battery cell group 11 may include multiple battery cells 111 to increase the capacity of the battery 10. The specific number of battery cells 111 included in one battery cell group 11 is not limited here and will be designed according to the actual needs.

[0088] Here, the support plate 13 is installed inside the cavity 124, and the battery cell group 11 is attached to the support plate 13. The battery cell group 11 may also be fixedly connected to the support plate 13 by adhesive. In this way, the battery cell group 11 is connected to the housing 12 via the support plate 13. Here, the support plate 13 and the housing 12 are installed in relative isolation, thereby achieving relative isolation between the battery cell group 11 and the housing 12. Even if a battery cell 111 in the battery cell group 11 experiences thermal runaway, the battery cell 111 and the housing 12 are insulated, reducing the probability of a two-point insulation failure and improving safety.

[0089] In the actual execution process, the support plate 13 is first installed inside the housing 12, insulating the support plate 13 from the housing 12. Next, the battery cell group 11 is installed on the support plate 13, and multiple battery cells 111 are fixed to the support plate 13 by adhesive. If one battery cell 111 experiences thermal runaway, the battery cell 111 and the housing 12 are relatively insulated. Therefore, even if the insulation design of the high-voltage components of the remaining battery cells 111 is damaged by exhaust gas generated from the battery cell 111, it will only result in a single-point insulation failure, reducing the probability of a double-point insulation failure and improving the safety performance of the battery 10.

[0090] According to the embodiment of the present application, the battery 10 can reduce the probability of two-point insulation failure when the battery cell 111 experiences thermal runaway, thereby improving the safety of the battery 10.

[0091] According to some embodiments of this application, the insulation resistance between the support plate 13 and the housing 12 is R1, and R1 ≥ 1 MΩ can be satisfied. In some embodiments, R1 may be 1 MΩ, 2 MΩ, 3 MΩ, 5 MΩ, 10 MΩ, or other resistance values ​​of 1 MΩ or more, and is not limited herein.

[0092] In this embodiment, by limiting the minimum value of the insulation resistance R1 between the support plate 13 and the housing 12, the insulation requirements between the support plate 13 and the housing 12 are met, and furthermore, the insulation requirements between the battery cell 111 and the housing 12 are met, resulting in a superior insulation effect, a reduced probability of failure, and ensuring the safety of the battery 10.

[0093] According to some embodiments of this application, the support plate 13 may include a plastic member, as shown in Figures 2 and 3.

[0094] In this embodiment, the support plate 13 may include a plastic member, and the entire support plate 13 may be made of a plastic member, and the material of the plastic member may be polyolefin or polypropylene, etc., and is not specifically limited here.

[0095] According to the support plate 13 of the embodiment of this application, by installing the support plate 13 made of a plastic material, it is possible to achieve excellent insulation effect, low manufacturing cost, easy installation, and easy scaling up of production.

[0096] According to some embodiments of this application, the support plate 13 may be connected to the housing 12, as shown in Figures 2 to 8.

[0097] In this embodiment, the support plate 13 can be directly connected to the housing 12, which increases the connection strength between the support plate 13 and the housing 12, resulting in a relatively stable structure and improved overall structural strength.

[0098] In actual implementation, the support plate 13 may be installed in a flat shape, or it may be attached between the bottom plate 121 and the frame 123, and a fixed connection is achieved by fasteners, making installation easy and providing excellent insulation.

[0099] According to the embodiment of this application, by connecting the support plate 13 to the housing 12, the overall structural strength of the battery 10 is increased, and stability during use is improved.

[0100] According to some embodiments of this application, as shown in Figures 4 to 8, the support plate 13 may include a first portion 131 and a second portion 132 connected to each other, the battery cell group 11 may be attached to the first portion 131, the second portion 132 may be connected to the housing 12, the first portion 131 may be a metal member, and the second portion 132 may be a plastic member.

[0101] In this embodiment, the support plate 13 may include a first portion 131 and a second portion 132, where the first portion 131 may be a metal member and the second portion 132 may be a plastic member, and the first portion 131 and the second portion 132 are connected to each other to form the support plate 13. The metal member has excellent thermal conductivity and may be installed as a water cooling plate, or a flow path may be installed within the metal member, and by circulating a heat exchange medium in the flow path, the temperature of the battery cell 111 can be adjusted, improving the performance and stability of the battery 10 when in use. The plastic member has excellent insulating properties and high structural strength and can function as a good insulating member.

[0102] The battery cell group 11 is attached to the first part 131, and heat exchange is performed with the battery cell group 11 by the metal member, thereby regulating the temperature of the battery cells 111 and improving the operating performance of the battery cells 111. The plastic member is connected to the metal member, so the plastic member supports the metal member and the battery cell group 11 on the one hand, and is attached to the housing 12 on the other hand, insulating the metal member, the battery cell group 11 and the housing 12, and ensuring insulation.

[0103] In actual implementation, the second part 132 is provided around the first part 131 and is fixedly attached between the frame 123 and the bottom plate 121 by fasteners, thereby providing a certain support function to the first part 131 and ensuring insulation between the first part 131 and the housing 12.

[0104] According to the embodiment of the present application, by installing the support plate 13 as a first portion 131 and a second portion 132, the first portion 131 can perform heat exchange with the battery cell group 11 to improve the stability of the battery cell group 11, and the second portion 132, being a plastic material, can exhibit an effective insulating effect.

[0105] According to some embodiments of this application, as shown in Figures 4 to 8, the first part 131 and the second part 132 may have a projection 1312 on one side, a groove on the other side, or the projection 1312 may be fitted into the groove, thereby connecting the first part 131 and the second part 132 to each other.

[0106] In this embodiment, the projection 1312 may be provided on the first portion 131 and the groove on the second portion 132, or the groove may be provided on the first portion 131 and the projection 1312 may be provided on the second portion 132. By fitting the projection 1312 into the groove, a fixed connection between the first portion 131 and the second portion 132 is achieved, resulting in a simple structure with high strength.

[0107] Here, there may be multiple projections 1312, and the grooves may be multiple grooves corresponding one-to-one to the projections 1312. By providing multiple projections 1312 and multiple grooves, the strength is improved and the stress becomes more uniform.

[0108] According to the embodiment of this application, by installing the projection 1312 and the groove to connect the first part 131 and the second part 132, the connection strength between the first part 131 and the second part 132 is increased, thereby increasing the overall structural strength.

[0109] According to some embodiments of this application, as shown in Figures 4 to 8, the first portion 131 may include a main plate 1311 and a projection 1312 that protrudes from the outer peripheral surface of the main plate 1311 toward the second portion 132, the battery cell group 11 may be attached to the main plate 1311, the thickness of the projection 1312 may be less than the thickness of the main plate 1311, the second portion 132 may be installed around the main plate 1311, and there is a groove on the side of the second portion 132 toward the first portion 131.

[0110] In this embodiment, the first portion 131 may include a main plate 1311 and a projection 1312, the main plate 1311 being used to mount the battery cell group 11, and the battery cell group 11 may be fixedly connected to the main plate 1311 by adhesive.

[0111] The projection 1312 may be installed protruding from the outer circumferential surface of the main plate 1311 toward the second portion 132, and the thickness of the projection 1312 may be less than the thickness of the main plate 1311, thereby creating a step between the projection 1312 and the main plate 1311. The second portion 132 may be installed around the main plate 1311, and there may be a groove on the side of the second portion 132 toward the first portion 131, and the projection 1312 and the groove can be fitted and engaged to achieve a fixed connection, thereby increasing the connection strength between the first portion 131 and the second portion 132, improving the overall structural strength of the support plate 13 and improving the stability of the battery 10 when in use.

[0112] In one example, the projection 1312 may be installed in a ring around the outer wall of the main plate body 1311, and the groove may be installed in a ring relative to the inner surface of the second portion 132, resulting in a large connection area and easy processing.

[0113] In another example, there may be multiple projections 1312, which are distributed spaced apart along the circumferential direction of the main plate 1311. There are multiple grooves and projections 1312, and they correspond one-to-one, resulting in high structural strength and strong resistance to deformation.

[0114] Here, the projection 1312 may be positioned in the center along the thickness direction of the main plate 1311, and the groove of the second part 132 may be positioned in the center along the thickness direction of the second part 132. This ensures that after the projection 1312 is fitted into the groove, positional constraints are formed on both sides in the thickness direction, thereby ensuring the connection strength between the first part 131 and the second part 132.

[0115] In actual implementation, a flow path may be provided within the main plate 1311, and a heat exchange medium may be circulated within the flow path to form a water-cooled plate structure and regulate the temperature of the battery cell 111. Here, since the second part 132 is a plastic material, the second part 132 and the first part 131 may be installed by injection molding, making manufacturing and processing easy. Here, the surface of the second part 132 in the thickness direction may be installed so as to be flush with the surface of the main plate 1311 in the thickness direction, thereby facilitating manufacturing, transportation, and assembly.

[0116] The arrangement of the projection 1312 and groove in the embodiment of this application increases the connection strength between the first portion 131 and the second portion 132, enhances the overall structural strength of the support plate 13, and improves the stability of the battery 10 when in use.

[0117] According to some embodiments of this application, as shown in Figures 5 to 8, the support plate 13 may be provided with mounting holes 1321, which may be used to connect the support plate 13 and the housing 12 by passing fasteners through them.

[0118] The housing 12 may include a frame 123 and a bottom plate 121, and the frame 123 and the bottom plate 121 may be fixedly connected by fasteners, thereby enabling the assembly of the housing 12. The support plate 13 may be provided with mounting holes 1321, and when the support plate 13 is connected to the housing 12, the portion of the support plate 13 with the mounting holes 1321 may be sandwiched between the frame 123 and the bottom plate 121, thereby enabling the fasteners to pass through the frame 123, the mounting holes 1321 and the bottom plate 121 to connect the support plate 13 and the housing 12.

[0119] To facilitate assembly, the periphery of the support plate 13 is generally aligned with the edge of the housing 12 to prevent the support plate 13 from interfering with the outside world, and the mounting holes 1321 are located close to the edge of the support plate 13 to facilitate installation, and the mounting holes 1321 may be installed in at least one of the following ways.

[0120] In method 1, as shown in Figures 5 and 6, the mounting hole 1321 can penetrate the second portion 132 along the thickness direction of the support plate 13.

[0121] In this embodiment, the mounting hole 1321 penetrates only the second portion 132 along the thickness direction of the support plate 13, and only the second portion 132 is sandwiched between the frame 123 and the bottom plate 121 and connected by fasteners, and the first portion 131 and the battery cell group 11 are supported by the second portion 132.

[0122] In actual implementation, when manufacturing the support plate 13, the second part 132 can be connected to the first part 131 first, and then mounting holes 1321 can be machined in the second part 132, simplifying the manufacturing process, improving manufacturing efficiency, and reducing material costs.

[0123] In method 2, as shown in Figures 7 and 8, the mounting hole 1321 penetrates the projection 1312 and the second portion 132 along the thickness direction of the support plate 13.

[0124] In this embodiment, the projection 1312 extends outward from the outer surface of the main plate 1311 to the space between the frame 123 and the bottom plate 121, resulting in a wider projection 1312 and a deeper groove in the second portion 132. The mounting hole 1321 penetrates the projection 1312 and the second portion 132 along the thickness direction of the support plate 13, so that when the support plate 13 is connected to the housing 12, the projection 1312 and the second portion 132 are sandwiched together between the frame 123 and the bottom plate 121 and connected by fasteners, thereby directly transmitting the fastening force to the first portion 131. Since the first portion 131 is a metal member, the structural strength is higher, improving connection strength and stability.

[0125] In actual implementation, when manufacturing the support plate 13, first the main plate body 1311 and projection 1312 of the first part 131 are manufactured, mounting holes 1321 are pre-processed in the projection 1312, then the second part 132 and the first part 131 are connected by integral injection molding, the second part 132 is covered on the outside of the projection 1312, and furthermore, at least a part of the second part 132 is covered on the inner wall of the pre-processed mounting hole 1321 on the projection 1312 to form the mounting hole 1321, thereby isolating and insulating the projection 1312 of the first part 131 from the housing 12 and fasteners, ensuring insulation, high structural strength, and excellent stability.

[0126] Here, the fastener may be a bolt and nut assembly or a rivet member, and is not limited thereto.

[0127] According to the mounting hole 1321 of the embodiment of this application, the connection strength between the support plate 13 and the housing 12 is increased, resulting in better stability.

[0128] According to some embodiments of this application, as shown in Figures 9 to 25, specifically, please refer to Figures 9 and 10, the support plate 13 may be made of metal, the support plate 13 may be installed spaced apart from the housing 12, and a connecting plate 14 may be installed between the side of the support plate 13 away from the battery cell group 11 and the housing 12, the connecting plate 14 may be made of insulating material, and is connected to the support plate 13 and the housing 12, respectively.

[0129] In this embodiment, the support plate 13 may be made of a metal material, which has high structural strength and excellent thermal conductivity. A flow path 133 may be provided inside the support plate 13, and the temperature of the battery cell group 11 can be controlled by circulating a heat exchange medium in the flow path 133.

[0130] The support plate 13 may be installed at a distance from the housing 12, and a connecting plate 14 may be installed between the side of the support plate 13 away from the battery cell group 11 and the housing 12. Both sides of the connecting plate 14 are connected to the support plate 13 and the housing 12, respectively, so that the support plate 13 can be attached to the housing 12 via the connecting plate 14. The support plate 13 and the housing 12 can be relatively fixed together by fixing the connecting plate 14 to the support plate 13 by adhesive and fixing the connecting plate 14 to the housing 12 by adhesive.

[0131] The connecting plate 14 may be an insulating material. By installing the connecting plate 14 as an insulating material and separating the support plate 13 from the housing 12, the support plate 13 and the housing 12 are insulated. Multiple connecting plates 14 may be installed, and multiple connecting plates 14 can be installed spaced apart to ensure mounting strength and reduce material costs.

[0132] According to the embodiment of this application, by installing the connecting plate 14, the difficulty of manufacturing and processing is reduced, assembly is easy, manufacturing costs are reduced, and the probability of two-point insulation failure occurring in the battery 10 is reduced, thereby improving safety performance.

[0133] According to some embodiments of this application, as shown in Figures 11 to 25, specifically referring to Figures 11 to 13, the support plates 13 may be installed in multiple locations, and the multiple support plates 13 may be installed spaced apart from each other, and each support plate 13 can support at least one battery cell group 11.

[0134] In this embodiment, there may be multiple support plates 13, and each of the multiple support plates 13 is connected to the housing 12 via a connecting plate 14, thereby insulating each of the multiple support plates 13 from the housing 12. Furthermore, the multiple support plates 13 may be installed spaced apart from each other, thereby insulating each of the multiple support plates 13 from each other, and each support plate 13 can support at least one battery cell group 11, and the battery cell groups 11 on different support plates 13 are also installed spaced apart from each other.

[0135] If a battery cell 111 experiences thermal runaway, the insulating layer at the bottom of the battery cell 111 will be destroyed, easily destroying the insulating design between the battery cell 111 and the support plate 13, causing electrical conductivity between the battery cell 111 and the support plate 13. If two battery cells 111 experience thermal runaway simultaneously, the two battery cells 111 will become electrically conductive through the support plate 13, potentially causing a short circuit and even high-voltage destruction of the battery 10, thus posing a safety hazard.

[0136] By installing multiple support plates 13, if a battery cell 111 on a different support plate 13 experiences thermal runaway, the different support plates 13 are relatively insulated from each other. Therefore, it is not easy for the battery cells 111 on different support plates 13 to conduct electricity and form a short circuit, thereby reducing the probability of a short circuit and even high-voltage breakdown occurring in the battery 10, and improving the safety performance of the battery 10.

[0137] Here, the number of support plates 13 may be two, three, four, or more, and the number of battery cell groups 11 on each support plate 13 may be one, two, three, or four. The specific number is not limited here and will be determined according to the actual needs of the internal circuit design of the battery 10.

[0138] According to the embodiment of this application, by installing multiple support plates 13, the probability of short circuits and high-voltage breakdowns in the battery 10 is reduced, and the safety performance of the battery 10 is improved.

[0139] According to some embodiments of this application, there may be multiple battery cell groups 11 installed, and the multiple battery cell groups 11 may be installed in a one-to-one correspondence with the multiple support plates 13.

[0140] In this embodiment, multiple battery cell groups 11 may be installed in a one-to-one correspondence with multiple support plates 13, that is, one battery cell group 11 is provided on each support plate 13, making it easy to arrange and assemble the battery cell groups 11 and the support plates 13, increasing the arrangement density of multiple battery cells 111 on the support plates 13, and making management easier.

[0141] According to some embodiments of this application, as shown in Figures 14 and 15, at least one connecting plate 14 has a projection 141 which extends into the gap between two adjacent support plates 13.

[0142] In this embodiment, at least one connecting plate 14 may have a projection 141 that extends into the gap between two adjacent support plates 13, further isolating the two support plates 13. This prevents the two support plates 13 from coming close together and becoming electrically connected even if the battery 10 vibrates or shakes during use, thereby improving the stability of the insulating structure and enhancing the safety performance of the battery 10.

[0143] Here, a connecting plate 14 may be installed on the adjacent side of each pair of adjacent support plates 13, and a projection 141 may be installed on the connecting plate 14, thereby providing a projection 141 in each of the gaps between each pair of adjacent support plates 13.

[0144] According to the embodiment of this application, by providing the projection 141 on the connecting plate 14, the insulation design between different support plates 13 becomes more stable, and the safety performance of the battery 10 is improved.

[0145] According to some embodiments of this application, the insulation resistance between two adjacent support plates 13 is R2, and R2 ≥ 1 kΩ can be satisfied.

[0146] It is understandable that the greater the insulation resistance between different support plates 13, the lower the probability of short circuits and high-voltage breakdowns occurring. Conversely, the closer the distance between two support plates 13, the lower the resistance, and the greater the distance between two support plates 13, the higher the resistance. The shortest distance between two adjacent support plates 13, and by limiting the insulation resistance between two adjacent support plates 13, the insulation resistance between each support plate 13 can all meet the requirements.

[0147] Here, the minimum value of the insulation resistance R2 between two adjacent support plates 13 is 1 kΩ, and R2 may be 1 kΩ, 2 kΩ, 3 kΩ, 5 kΩ, 10 kΩ, 100 kΩ, 1 MΩ, or any other resistance value greater than or equal to 1 kΩ, and is not limited thereto.

[0148] According to the limited insulation resistance in the embodiment of this application, by limiting the minimum value of the insulation resistance R2 between two adjacent support plates 13, the insulation effect between different support plates 13 is ensured, thereby improving the safety of the battery 10.

[0149] According to some embodiments of this application, in the same group of battery cells 11 mounted on the same support plate 13, the potential difference between the cases of two adjacent battery cells 111 is Ui, and Ui ≤ 50V.

[0150] If two battery cells 111 located on the same support plate 13 experience thermal runaway simultaneously, there is a very high probability that the two battery cells 111 will conduct electricity through the support plate 13 in which they are located. As a result, a maximum value exists in the voltage difference between two adjacent battery cells 111, thereby reducing the probability of ignition.

[0151] By limiting the maximum potential difference Ui between the cases of the two battery cells 111, the probability of ignition is reduced, and the safety of the battery 10 is improved.

[0152] Here, the potential difference Ui between the cases of two adjacent battery cells 111 may be any other value less than 50V, 45V, 40V, 30V, 20V, 10V, or 50V, and is not specifically limited here.

[0153] According to some embodiments of this application, Ui ≤ 20V.

[0154] In this embodiment, the risk of ignition is further reduced by further limiting the range of the potential difference Ui between the cases of two adjacent battery cells 111 in the same battery cell group 11 on the same support plate 13.

[0155] Here, the potential difference Ui between the cases of two adjacent battery cells 111 may be 20V, 15V, 10V, 5V, 3.5V, or any other value less than 20V, and is not specifically limited here.

[0156] According to some embodiments of this application, in the same group of battery cells 11 mounted on the same support plate 13, the maximum potential difference between the cases of two adjacent battery cells 111 is U max The volumetric energy density of the battery cell 111 may be E.

number

[0157] In this embodiment, the maximum potential difference U between the cases of two adjacent battery cells 111 in the same battery cell group 11 is max Based on the product of the volumetric energy density E of the battery cell 111, the risk of ignition after thermal runaway of two adjacent battery cells 111 in the same battery cell group 11 can be determined. Referring to Table 1, Table 1 shows the behavior of two adjacent battery cells 111 after thermal runaway when the volumetric energy densities and maximum potential difference of the battery cells 111 are different.

[0158] According to Table 1, in Comparative Examples 1 to 3, TIFF2026508950000005.tif6168 It was found that two adjacent battery cells 111 in the same battery cell group 11 are prone to ignition after thermal runaway, leading to safety hazards. In Example 9, TIFF2026508950000006.tif7168 Two adjacent battery cells 111 in the same battery cell group 11 experienced a minor short circuit after thermal runaway, generating heat but not causing a fire; this was the maximum critical point.

number

[0159] In addition, considering the power consumption requirements and characteristics of the battery 10, the volumetric energy density and potential difference of the battery cell 111 should not be too low, E*U max By limiting the minimum value, the volume utilization rate of the battery cell 111 is ensured, and the cost performance of the battery 10 is improved.

[0160] Here, In some examples, TIFF2026508950000009.tif24168

[0161] [Table 1]

[0162] According to the embodiments of this application, E*U max By limiting the maximum and minimum values, the probability of ignition occurring when the two battery cells 111 experience thermal runaway is reduced, while ensuring high cost performance for the battery 10.

[0163] According to some embodiments of this application, the maximum potential difference between the cases of two adjacent battery cells 111 in the same battery cell group 11 is U max The volumetric energy density of the battery cell 111 may be E, and it can satisfy 300Wh / L≦E≦800Wh / L and 3.5V≦Umax≦50V.

[0164] To understand this, if the voltage of the battery cells 111 is low, the battery 10 needs to connect more battery cells 111 in series with the same power consumption to obtain the required current and voltage. As a result, the proportion of mechanical parts in the battery 10 increases, the volume utilization rate of the effective charge / discharge unit decreases, and the cost-effectiveness of the battery pack 10 decreases. On the other hand, if the voltage of the battery cells 111 is too high, it is prone to causing a fire.

[0165] According to the test data in Table 1, 300Wh / L ≤ E ≤ 800Wh / L, 3.5V ≤ U max For voltages ≤ 50V, battery 10 offers good cost performance and does not easily cause fires.

[0166] Here, the range of the volumetric energy density E of the battery cell 111 is [300 Wh / L, 800 Wh / L], and in some embodiments, E may be 300 Wh / L, 400 Wh / L, 500 Wh / L, 600 Wh / L, 700 Wh / L, 800 Wh / L, or other values ​​between 300 Wh / L and 800 Wh / L, and is not specifically limited herein.

[0167] Here, the maximum value U of the potential difference between two adjacent battery cells 111 in the same battery cell group 11. max The voltages are [3.5V, 50V], and in some embodiments, U max This may be 3.5V, 10V, 15V, 20V, 50V, or any other value between 3.5V and 50V, and is not specifically limited to these values.

[0168] According to the embodiment of this application, the maximum value U of the potential difference between the cases of two adjacent battery cells 111 max By limiting the range of the volumetric energy density E of the battery cell 111, the cost-effectiveness of the battery cell 111 can be improved, and it does not easily cause ignition.

[0169] According to some embodiments of this application,

number

[0170] In this embodiment, Referring to Table 1 of TIFF2026508950000012.tif6168, within this range of values, the risk of causing a minor short circuit and overheating after thermal runaway in two adjacent battery cells 111 in the same battery cell group 11 is low, the probability of causing ignition is lower, and the safety is higher. In some embodiments, TIFF2026508950000013.tif18168

[0171] In this embodiment, U max The range of the value may be [3.5V, 20V], and in this range, the risk of causing a minor short circuit and overheating after thermal runaway of two adjacent battery cells 111 in the same battery cell group 11 is low, the probability of causing ignition is lower, and safety is higher. In some embodiments, U max This may be 3.5V, 10V, 15V, 20V, or any other value between 3.5V and 20V, and is not specifically limited to these values.

[0172] According to the embodiments of this application, E*U max and U max By further limiting the range, the safety of battery 10 is further improved.

[0173] According to some embodiments of this application, as shown in Figures 16 and 17, a flow path 133 for the circulation of a heat exchange medium may be provided within the support plate 13, the heat exchange medium is used to regulate the temperature of the battery cell 111, and the flow paths 133 of the multiple support plates 13 are connected via a connecting portion 15, the connecting portion 15 is an insulating member.

[0174] In this embodiment, a flow path 133 for the circulation of a heat exchange medium may be provided inside the support plate 13. The heat exchange medium may be cooling water or a refrigerant, and the temperature of the battery cell 111 is adjusted by the heat exchange medium, thereby heating or cooling the battery cell 111 and improving the operating efficiency and service life of the battery cell 111.

[0175] The flow paths 133 of multiple support plates 13 can communicate with each other via the connecting portion 15, thereby allowing the heat exchange medium to circulate within the multiple support plates 13. This reduces the number of connection ports between the flow paths 133 of each support plate 13 and the outside, making installation easier. The connecting portion 15 is an insulating member, providing insulation between the two support plates 13.

[0176] In the actual execution process, referring to Figures 16 and 17, taking the example of having two support plates 13, each of the two support plates 13 is provided with one inlet and one outlet. The inlet of the first of the two support plates 13 is connected to the outlet of an external heat exchanger and is used to introduce the heat exchange medium into the battery 10. The outlet of the first of the two support plates 13 communicates with the inlet of the second support plate via a connection part 15. As a result, the heat exchange medium circulates within the first of the two support plates 13, enters the second support plate, flows out through the outlet of the second support plate, and circulates back to the inlet of the heat exchanger, completing one cycle of circulation of the heat exchange medium. Here, the inlets and outlets of the two support plates 13 may be located on the same side, thereby reducing the space occupied by the pipe joint and connection part 15 and improving the space utilization rate inside the battery 10.

[0177] According to the connection portion 15 of the embodiment of this application, when ensuring an insulating design, the thermal management design of the battery cell 111 is made easier by connecting the flow paths 133 of each support plate 13.

[0178] According to some embodiments of this application, in two adjacent battery cell groups 11 mounted on two adjacent support plates 13, the maximum potential difference between the cases of two adjacent battery cells 111 belonging to each of the two adjacent battery cell groups 11 is U1, and the resistance of the heat exchange medium in the connection portion 15 is R3. The condition 0.05V / kΩ ≤ U1 / R3 ≤ 400V / kΩ can be satisfied, where R3 = ρL / S, where ρ is the conductivity of the heat exchange medium, L is the length over which the heat exchange medium flows within the connection part 15, and S is the cross-sectional area of ​​the connection part 15.

[0179] It should be explained that the connection part 15 is installed as an insulating material and has high insulation resistance, but the heat exchange medium flowing within the connection part 15 is generally made of a conductive material, and after the flow paths 133 of two adjacent support plates 13 are connected via the connection part 15, if one battery cell 111 in each of the two adjacent support plates 13 experiences thermal runaway, the voltage between the two battery cells 111 may destroy the heat exchange medium and cause a fire, or an electrolytic cell structure may be formed by the heat exchange medium, causing an electrolytic reaction to raise the temperature of the connection point between the support plate 13 and the connection part 15, which may cause the connection part 15 to soften and even leak the heat exchange medium, thus posing a safety risk.

[0180] In this embodiment, in two adjacent battery cell groups 11 attached to two adjacent support plates 13, the maximum potential difference U1 between the cases of two adjacent battery cells 111 belonging to each of the two adjacent battery cell groups 11 is the maximum voltage that the heat exchange medium in the connection part 15 can withstand. When this potential difference is large, the probability of the heat exchange medium being destroyed is high. Similarly, when the resistance of the heat exchange medium in the connection part 15 is low, the probability of destruction by the heat exchange medium is high.

[0181] It is understandable that the resistance value of the heat exchange medium depends on the conductivity of the heat exchange medium, the length of the connection part 15, and the cross-sectional area of ​​the flow path of the connection part 15.

[0182] In this embodiment, for different U1 / R3 values, a reasonable range for U1 / R3 is obtained by testing the results after thermal runaway of two adjacent battery cell groups 11 attached to two adjacent support plates 13, where each battery cell belongs to one of the two adjacent battery cell groups 11 and is adjacent to the other. Referring to Table 2, Table 2 shows the behavior after thermal runaway of two adjacent battery cell groups 11 attached to two adjacent support plates 13, where each battery cell belongs to one of the two adjacent battery cell groups 11 and is adjacent to the other, for different U1 / R3 values.

[0183] [Table 2]

[0184] According to Table 2, in Comparative Examples 1-3, when U1 / R3 is greater than 400V / kΩ, it was found that in two adjacent battery cell groups 11 attached to two adjacent support plates 13, there is a possibility that two adjacent battery cells 111 belonging to each of the two adjacent battery cell groups 11 may experience thermal runaway and ignite, easily leading to a safety hazard. In Example 9, when U1 / R3 is equal to 400V / kΩ, the temperature of the connection part 15 rose significantly, but it did not cause ignition, indicating that this is the maximum critical point. When U1 / R3 ≤ 400V / kΩ, it does not cause ignition, indicating a relatively high level of safety.

[0185] Furthermore, considering the actual manufacturing and processing costs, a minimum value exists in U1 / R3, which is 0.05V / kΩ.

[0186] Here, the range of the value of U1 / R3 is [0.05V / KΩ, 400V / KΩ], and in some embodiments, U1 / R3 may be other values ​​such as 0.05V / KΩ, 0.2V / KΩ, 0.4V / KΩ, 0.5V / KΩ, 2V / KΩ, 4V / KΩ, 50V / KΩ, 200V / KΩ, 400V / KΩ, or 0.05V / KΩ to 400V / KΩ, and is not specifically limited thereto.

[0187] According to the embodiment of this application, by limiting the range of U1 / R3, safety performance when the connection part 15 is installed is ensured and manufacturing costs are controlled.

[0188] According to some embodiments of this application, 50V ≤ U1 ≤ 400V and 1KΩ ≤ R3 ≤ 1000KΩ.

[0189] To make it understandable, in the design and manufacture of the battery 10, it is common to base the design on actual power usage. When U1 is large, the output power of the battery 10 is high and the range of application is wide. However, if the battery cell 111 experiences thermal runaway, it is prone to destruction due to high voltage. Therefore, when U1 is at its maximum value, there is a minimum value for R3, thereby reducing safety risks. When U1 is small, safety is high but cost-effectiveness is low. When U1 is at its minimum value, there is a maximum value for R3, which prevents the conductivity of the connection 15 between adjacent support plates 13 and the heat exchange medium from increasing design costs due to excessively high resistance requirements, thereby reducing the difficulty of the design and minimizing the increased risk of leakage due to the connection 15 being too long or difficulties such as piping layout.

[0190] According to Table 2 mentioned above, it was found that when U1 has a maximum value of 400V, there is a minimum value of 1KΩ in R3, and when U1 has a minimum value of 50V, there is a maximum value of 1000KΩ in R3.

[0191] Here, the range of the value of U1 is [50V, 400V], and in some embodiments, U1 may be 50V, 100V, 150V, 200V, 250V, 300V, 400V, or other values ​​between 50V and 400V, and is not specifically limited herein.

[0192] Here, the range of R3 is [1kΩ, 1000kΩ], and in some embodiments, R3 may be 1kΩ, 10kΩ, 100kΩ, 300kΩ, 500kΩ, 800kΩ, 1000kΩ, or other values ​​between 1kΩ and 1000kΩ, and is not specifically limited here.

[0193] According to the embodiment of this application, the safety performance of the battery 10 is improved and the manufacturing and design costs of the battery 10 are controlled by limiting the range of values ​​for U1 and R3.

[0194] According to some embodiments of this application, 0.05V / kΩ ≤ U1 / R3 ≤ 200V / kΩ.

[0195] In this embodiment, the range of the value of U1 / R3 may be [0.05V / kΩ, 200V / kΩ]. Referring to Table 2, in Example 6, when U1 / R3 = 200V / kΩ, in two adjacent battery cell groups 11 attached to two adjacent support plates 13, after two adjacent battery cells 111 belonging to each of the two adjacent battery cell groups 11 experience thermal runaway, the temperature of the connection part 15 rises slightly. Therefore, when U1 / R3 ≤ 200V / kΩ, safety is higher.

[0196] In some embodiments, U1 / R3 may be 0.05V / KΩ, 0.2V / KΩ, 0.4V / KΩ, 0.5V / KΩ, 2V / KΩ, 4V / KΩ, 50V / KΩ, 200V / KΩ, or other values ​​between 0.05V / KΩ and 200V / KΩ, and is not specifically limited herein.

[0197] According to the range of U1 / R3 values ​​in the embodiments of this application, the safety of the battery 10 is higher.

[0198] According to some embodiments of this application, as shown in Figures 18 to 25, the side wall of the battery cell 111 on which the pressure release mechanism 1111 is provided may be connected to a support plate 13, and the support plate 13 may have a relief structure 134 installed opposite the pressure release mechanism 1111.

[0199] A pressure release mechanism 1111 may be provided on the side wall of the battery cell 111. The specific form of the pressure release mechanism 1111 is not limited here and may be a commercially available general pressure release mechanism 1111. If the battery cell 111 experiences thermal runaway, the pressure release mechanism 1111 can actively open and release air to reduce the internal pressure of the battery cell 111, thereby preventing the rupture and explosion of the battery cell 111 case and improving safety.

[0200] In this embodiment, the side wall of the battery cell 111 on which the pressure release mechanism 1111 is provided may be connected to the support plate 13. By installing a relief structure 134 on the support plate 13 opposite the pressure release mechanism 1111, the support plate 13 provides relief for the pressure release mechanism 1111, the support plate 13 provides support for the battery cell group 11, and the pressure release mechanism 1111 can be released smoothly, thereby improving the safety of the battery 10.

[0201] According to the embodiment of this application, by installing a relief structure 134 on the support plate 13, the pressure release mechanism 1111 can be opened smoothly, thereby improving the safety performance of the battery 10.

[0202] According to some embodiments of this application, the relief structure 134 may correspond one-to-one with the pressure release mechanism 1111, or each relief structure 134 may correspond to a plurality of pressure release mechanisms 1111.

[0203] In one example, as shown in Figures 18 and 19, multiple relief structures 134 may be installed on each support plate 13, such that the number of relief structures 134 on each support plate 13 is the same as the number of battery cells 111 on the support plate 13. In this way, the relief structures 134 correspond one-to-one with the pressure release mechanisms 1111, playing a relief role for each pressure release mechanism 1111, reducing mutual influence between the pressure release mechanisms 1111, and improving stability.

[0204] In another example, as shown in Figures 20 to 25, when the pressure release mechanisms 1111 of multiple battery cells 111 are arranged in an orderly manner, one or more relief structures 134 may be installed on each support plate 13. This allows each relief structure 134 to correspond to multiple pressure release mechanisms 1111, to perform a relief role for the multiple pressure release mechanisms 1111, and simplifies the processing of the support plate 13.

[0205] According to some embodiments of this application, as shown in Figures 18 and 19, the relief structure 134 may include through holes 1341 provided in the support plate 13.

[0206] In this embodiment, multiple through holes 1341 may be provided on each support plate 13, and the multiple through holes 1341 are provided in a one-to-one correspondence with the multiple pressure release mechanisms 1111. Here, the cross-sectional size of the through holes 1341 may be the same as the cross-sectional size of the pressure release mechanism 1111, or the cross-sectional area size of the through holes 1341 may be slightly larger than the cross-sectional size of the pressure release mechanism 1111. This effectively relieves the operation of the pressure release mechanism 1111 and ensures safety.

[0207] According to some embodiments of this application, as shown in Figures 20 to 23, the relief structure may include a relief groove 1342 provided in the support plate 13, and the opening of the relief groove 1342 may face the pressure release mechanism 1111.

[0208] In this embodiment, the relief structure may include a relief groove 1342 provided in the support plate 13, the opening of which is positioned toward the pressure release mechanism 1111, so that the pressure release mechanism 1111 can move into the relief groove 1342 when released, thus serving the role of escaping the pressure release mechanism 1111. Here, the relief groove 1342 extends along the arrangement direction of the battery cells 111, and one or more may be provided in the arrangement direction of the battery cells 111, so that one relief groove 1342 can correspond to multiple pressure release mechanisms 1111, and the difficulty of manufacturing is low.

[0209] According to some embodiments of this application, the depth of the relief groove 1342 is H, and can satisfy 2 mm ≤ H ≤ 10 mm, and / or the thickness of the bottom wall of the relief groove 1342 is h, and can satisfy 0.1 mm ≤ h ≤ 2 mm.

[0210] The pressure release mechanism 1111 requires a certain amount of space to move when it opens, and sufficient space for the pressure release mechanism 1111 is ensured by limiting the minimum depth H of the relief groove 1342. Furthermore, if the battery cell 111 experiences thermal runaway, the pressure release mechanism 1111 opens to discharge the high-temperature, high-pressure gas to the outside, and the high-temperature, high-pressure gas can be discharged from the relief groove 1342 by piercing the bottom wall of the relief groove 1342. By limiting the maximum thickness h of the bottom wall of the relief groove 1342, the discharged gas can easily pierce the bottom wall of the relief groove 1342 and be smoothly discharged into the housing 12.

[0211] To understand this, depending on the processing process and actual manufacturing requirements, if the depth H of the relief groove 1342 is too large, it will occupy a lot of space and reduce space utilization. Similarly, if the thickness h of the bottom wall of the relief groove 1342 is too small, the processing process requirements will be high and manufacturing costs will increase.

[0212] In this embodiment, the range of the depth H of the relief groove 1342 is [2mm to 10mm], and in some embodiments, the depth H of the relief groove 1342 may be 2mm, 4mm, 6mm, 8mm, 10mm or other values ​​of 2mm to 10mm, but is not limited thereto. The range of the bottom wall thickness h of the relief groove 1342 is [0.1mm to 2mm], and in some embodiments, the bottom wall thickness h of the relief groove 1342 may be 0.1mm, 0.4mm, 0.8mm, 1.2mm, 1.6mm, 2mm or other values ​​of 0.1mm to 2mm, but is not limited thereto.

[0213] According to the embodiment of this application, by limiting the design parameters of the relief groove 1342, it is ensured that the pressure release mechanism 1111 can operate normally, thereby ensuring the safety of the battery 10.

[0214] According to some embodiments of this application, as shown in Figures 24 and 25, there may be multiple support plates 13, the multiple support plates 13 may be spaced apart from each other, and the relief structure 134 may include a relief gap 1343 between two adjacent support plates 13.

[0215] In this embodiment, by installing multiple support plates 13, each support plate 13 is spaced apart from each other to form a relief gap 1343, and at least one relief gap 1343 corresponds to each of the multiple pressure release mechanisms 1111 of each battery cell group 11. As a result, the pressure release mechanisms 1111 can move towards the relief gap 1343 between two adjacent support plates 13, and the relief structure 134 may also include the relief gap 1343 between two adjacent support plates 13. The relief gap 1343 serves to allow the pressure release mechanisms 1111 to escape, and is easy to manufacture and process, which is advantageous in reducing manufacturing costs.

[0216] According to some embodiments of this application, the application further provides a power consumption device, the power consumption device comprising a battery 10 of any of the above technical proposals for supplying electrical energy.

[0217] The power consumption device may be any of the aforementioned devices or systems that use the battery cell 10.

[0218] According to the first embodiment of this application, as shown in Figures 2 and 3, this application provides a battery 10 which includes a housing 12, a battery cell group 11, and a support plate 13.

[0219] The enclosure 12 includes a bottom plate 121, a top cover 122, and a frame 123. The frame 123 has a hollow structure with open ends. The bottom plate 121 and the top cover 122 are placed over the open sides of the frame 123, and the bottom plate 121, the top cover 122, and the frame 123 jointly define the cavity 124.

[0220] Multiple battery cell groups 11 are housed within a cavity 124, and each battery cell group 11 includes multiple battery cell groups 111 arranged in a sequence. Multiple battery cell groups 11 may be provided.

[0221] The support plate 13 is installed inside the cavity 124, and a plurality of mounting holes 1321 are provided around the support plate 13, spaced apart along its circumferential direction. The mounting holes 1321 penetrate the support plate 13 along its thickness direction, and the peripheral edge of the support plate 13 is sandwiched between the frame 123 and the bottom plate 121. The support plate 13 is fixedly connected to the housing 12 by fasteners passing through the mounting holes 1321. Here, the support plate 13 is a plastic material, and the battery cell group 11 is attached to the support plate 13, and the support plate 13 supports a plurality of battery cells 111, thereby insulating the plurality of battery cells 111 relative to the housing 12, and the insulation resistance between the support plate 13 and the housing 12 is R1 ≥ 1 MΩ.

[0222] According to a second embodiment of this application, as shown in Figures 4 to 6, this application provides a battery 10 which includes a housing 12, a battery cell group 11, and a support plate 13.

[0223] Here, the design of the housing 12 and the battery cell group 11 will be described by referring to the first embodiment, and a repeated explanation will be omitted here.

[0224] The difference between this embodiment and the first embodiment is that in the second embodiment, the support plate 13 includes a first portion 131 and a second portion 132, the first portion 131 is a metal member and the second portion 132 is a plastic member, the first portion 131 includes a main plate body 1311 and a projection 1312, the battery cell group 11 is supported by the main plate body 1311, the projection 1312 is provided around the main plate body 1311 and extends outward from the outer wall of the main plate body 1311, and the thickness of the projection 1312 is the same as that of the main plate body 1311. The first part 131 is smaller than the thickness, the projection 1312 is positioned in the center of the main plate 1311 in the thickness direction, the second part 132 is positioned around the main plate 1311, a groove is provided on the inner surface of the second part 132 facing the main plate 1311, the projection 1312 can be fitted into the groove and engaged to fix it in place, a mounting hole 1321 is provided in the second part 132 so that the second part 132 is fixedly connected to the housing 12, and the first part 131 is supported by the second part 132.

[0225] According to a third embodiment of this application, as shown in Figures 7 and 8, this application provides a battery 10 which includes a housing 12, a battery cell group 11, and a support plate 13.

[0226] Here, the design of the housing 12 and the battery cell group 11 will be described by referring to the first embodiment, and part of the design of the support plate 13 will be described by referring to the second embodiment; repeated explanations will be omitted here.

[0227] The difference between this embodiment and the second embodiment is that the projection 1312 extends outward from the outer surface of the main plate 1311 to the edge of the housing 12, the second portion 132 covers the outside of the projection 1312, the mounting hole 1321 penetrates both the second portion 132 and the projection 1312, both the projection 1312 and the second portion 132 are sandwiched between the frame 123 and the bottom plate 121 and connected by fasteners, and the first portion 131 is directly connected to the housing 12 via the projection 1312.

[0228] According to the fourth embodiment of this application, as shown in Figures 9 to 10, this application provides a battery 10 which includes a housing 12, a battery cell group 11, and a support plate 13.

[0229] Here, the design of the housing 12 and the battery cell group 11 will be described by referring to the first embodiment, and a repeated explanation will be omitted here.

[0230] The difference between this embodiment and the first embodiment is that the battery 10 further includes a connecting plate 14, the support plate 13 is a metal member and is installed spaced apart from the housing 12, the connecting plate 14 is an insulating member and is installed between the support plate 13 and the bottom plate 121, is connected to the support plate 13 and the bottom plate 121 respectively, and the support plate 13 is insulated from the housing 12 via the connecting plate 14. Here, there may be multiple connecting plates 14, and the multiple connecting plates 14 may be installed spaced apart along the width direction of the housing 12.

[0231] Here, it should be explained that in the second, third, and fourth embodiments, a flow path 133 may be provided within the metal member in the embodiments, and a heat exchange medium may flow through the flow path 133, thereby adjusting the temperature of the battery cell 111.

[0232] According to the fifth embodiment of this application, as shown in Figures 11 to 13, this application provides a battery 10 which includes a housing 12, a battery cell group 11, a support plate 13, and a connecting plate 14.

[0233] Here, the installation of the housing 12, battery cell group 11, and connection plate 14 will be described in reference to the fourth embodiment, and a repeated explanation will be omitted here.

[0234] The difference between this embodiment and the fourth embodiment is that multiple support plates 13 are provided, the multiple support plates 13 are installed spaced apart, multiple battery cell groups 11 are provided, and the multiple battery cell groups 11 are installed in a one-to-one correspondence with the support plates 13. The insulation resistance between two adjacent support plates 13 is R2 ≥ 1 kΩ. In the same battery cell group 11 mounted on the same support plate 13, the potential difference between the cases of two adjacent battery cells 111 is U i ≤50V, and in some embodiments, U i The voltage is ≤20V.

[0235] In the same group of battery cells 11 mounted on the same support plate 13, the maximum potential difference between the cases of two adjacent battery cells 111 is U max Therefore, the volumetric energy density of battery cell 111 is E.

number

number

[0236] According to the sixth embodiment of this application, as shown in Figures 14 to 15, this application provides a battery 10 which includes a housing 12, a battery cell group 11, a support plate 13, and a connecting plate 14.

[0237] Here, the installation of the housing 12, battery cell group 11, and support plate 13 will be described in reference to the fifth embodiment, and a repeated explanation will be omitted here.

[0238] The difference between this embodiment and the fifth embodiment is that a projection 141 is provided on the side of the connecting plate 14 facing the support plate 13, and the projection 141 extends into the gap between two adjacent support plates 13, isolating the two adjacent support plates 13.

[0239] According to the seventh embodiment of this application, as shown in Figures 16 to 17, this application provides a battery 10 which includes a housing 12, a battery cell group 11, a support plate 13, and a connecting plate 14.

[0240] Here, the installation of the housing 12, battery cell group 11, and connection plate 14 will be described in reference to the fifth embodiment, and a repeated explanation will be omitted here.

[0241] The difference between this embodiment and the fifth embodiment is that the battery 10 further includes a connection part 15, each support plate 13 is provided with a flow path 133, a heat exchange medium flows through the flow path 133, the flow paths 133 of two adjacent support plates 13 are in communication via the connection part 15, and the heat exchange medium is circulated within the flow paths 133 of multiple support plates 13. Here, each support plate 13 is provided with two connection ports, the two connection ports are used to connect to both ends of the flow path 133 within the support plate 13, the adjacent connection ports of two adjacent support plates 13 are in communication via the connection part 15, and the two connection ports of each support plate 13 are provided on the same side in the longitudinal direction of the housing 12.

[0242] Here, in two adjacent battery cell groups 11 attached to two adjacent support plates 13, the maximum potential difference between the cases of two adjacent battery cells 111 belonging to the two adjacent battery cell groups 11 respectively is U1, the resistance of the heat exchange medium in the connection part 15 is R3, and 0.05V / KΩ ≦ U1 / R3 ≦ 400V / KΩ, 50V ≦ U1 ≦ 400V, 1KΩ ≦ R3 ≦ 1000KΩ are satisfied. In some embodiments, 0.05V / KΩ ≦ U1 / R3 ≦ 200V / KΩ.

[0243] According to the eighth embodiment of the present application, as shown in FIGS. 18 to 19, the present application provides a battery 10, and the battery 10 includes a housing 12, a battery cell group 11, a support plate 13, and a connection plate 14.

[0244] Here, for the installation of the housing 12, the battery cell group 11, and the connection plate 14, refer to the fifth embodiment, and the repeated description is omitted here.

[0245] The difference between this embodiment and the fifth embodiment is that a pressure relief mechanism 1111 is provided on the side wall connected to the support plate 13 of a plurality of battery cells 111 in the battery cell group 11, a plurality of through holes 1341 are provided on the support plate 13, the plurality of through holes 1341 correspond one-to-one to the pressure relief mechanisms 1111 of the plurality of battery cells 111 on the support plate 13, and the cross-sectional size of the through hole 1341 is not less than the cross-sectional size of the corresponding pressure relief mechanism 1111.

[0246] According to the ninth embodiment of the present application, as shown in FIGS. 20 to 23, the present application provides a battery 10, and the battery 10 includes a housing 12, a battery cell group 11, a support plate 13, and a connection plate 14.

[0247] Here, for the installation of the housing 12, the battery cell group 11, and the connection plate 14, refer to the eighth embodiment, and the repeated description is omitted here.

[0248] The difference between this embodiment and the eighth embodiment is that the support plate 13 is provided with at least one relief groove 1342, and one relief groove 1342 corresponds to a pressure release mechanism 1111 for multiple battery cells, where the depth H of the relief groove 1342 is ≥ 2 mm and the bottom wall thickness h of the relief groove 1342 is ≤ 2 mm.

[0249] According to the tenth embodiment of this application, as shown in Figures 24 to 25, this application provides a battery 10 which includes a housing 12, a battery cell group 11, a support plate 13, and a connecting plate 14.

[0250] Here, the installation of the housing 12, battery cell group 11, and connection plate 14 will be described in reference to the fifth embodiment, and a repeated explanation will be omitted here.

[0251] The difference between this embodiment and the fifth embodiment is that the multiple support plates 13 are spaced apart from each other to form a relief gap 1343, and the pressure release mechanism 1111 of the multiple battery cells 111 of the battery cell group 11 corresponds to the relief gap 1343.

[0252] It should be noted that, insofar as they do not contradict each other, the embodiments and features described herein can be combined with each other.

[0253] The foregoing are merely preferred embodiments of this application and do not limit it, and various modifications and changes are possible for those skilled in the art. All modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection. [Explanation of symbols]

[0254] Vehicle 1, Battery 10, Motor 20, Controller 30, Battery cell group 11, battery cell 111, pressure release mechanism 1111, Enclosure 12, bottom plate 121, top cover 122, frame 123, cavity 124, Support plate 13, first part 131, main plate body 1311, projection 1312, second part 132, mounting hole 1321, flow path 133, relief structure 134, through hole 1341, relief groove 1342, relief gap 1343, Connecting plate 14, projection 141, Connection part 15.

Claims

1. It is a battery, A housing having a cavity, A group of battery cells housed in the cavity, wherein the group of battery cells includes a plurality of arranged battery cells, A battery characterized by a support plate installed in the cavity, wherein the group of battery cells is attached to the support plate so as to support a plurality of the battery cells, and the support plate is installed insulated from the housing.

2. The battery according to claim 1, characterized in that the insulation resistance between the support plate and the housing is R1, and R1 ≥ 1 MΩ.

3. The battery according to claim 1 or 2, characterized in that the support plate includes a plastic member.

4. The battery according to claim 3, characterized in that the support plate is connected to the housing.

5. The battery according to claim 4, wherein the support plate includes a first portion and a second portion connected to each other, the battery cell group is attached to the first portion, the second portion is connected to the housing, the first portion is a metal member, and the second portion is a plastic member.

6. The battery according to claim 5, characterized in that the first part and the second part are connected to each other by having a projection on one of them and a groove on the other, and the projection being fitted into the groove.

7. The battery according to claim 6, wherein the first portion includes a main plate and a projection that protrudes from the outer peripheral surface of the main plate toward the second portion, the battery cell group is attached to the main plate, the thickness of the projection is less than the thickness of the main plate, the second portion is installed around the main plate, and the groove is on the side of the second portion toward the first portion.

8. The support plate is provided with mounting holes, which are used to connect the support plate and the housing by passing fasteners through them. The mounting hole penetrates the second portion along the thickness direction of the support plate, Or, The battery according to claim 7, characterized in that the mounting hole penetrates the projection and the second portion along the thickness direction of the support plate.

9. The battery according to claim 1 or 2, wherein the support plate is a metal member, the support plate is installed spaced apart from the housing, a connecting plate is installed between the side of the support plate away from the battery cell group and the housing, the connecting plate is an insulating member and is connected to the support plate and the housing, respectively.

10. The battery according to claim 9, characterized in that a plurality of support plates are installed, the plurality of support plates are installed spaced apart from each other, and each support plate supports at least one group of battery cells.

11. The battery according to claim 10, characterized in that a plurality of battery cell groups are installed, and the plurality of battery cell groups are installed in a one-to-one correspondence with a plurality of support plates.

12. The battery according to claim 10 or 11, characterized in that at least one of the connecting plates has a projection, the projection extending into the gap between two adjacent support plates.

13. The battery according to any one of claims 10 to 12, characterized in that the insulation resistance between two adjacent support plates is R2, and R2 ≥ 1 kΩ.

14. In the same group of battery cells mounted on the same support plate, the potential difference between the cases of two adjacent battery cells is U ｉ U ｉ A battery according to any one of claims 10 to 13, characterized in that it satisfies ≤ 50V.

15. U ｉ The battery according to claim 14, characterized in that it is ≤20V.

16. In the same group of battery cells mounted on the same support plate, the maximum potential difference between the cases of two adjacent battery cells is U ｍａｘ The volumetric energy density of the battery cell is E, [Math 1] A battery according to any one of claims 10 to 15, characterized in that it satisfies the following conditions.

17. 300Wh / L≦E≦800Wh / L, 3.5V≦U ｍａｘ The battery according to claim 16, characterized in that it is ≤ 50V. [Request Item 18] [Number 2] , 3.5V ≤ U ｍａｘ The battery according to claim 16 or 17, characterized in that it is ≤20V.

19. The battery according to any one of claims 10 to 18, wherein a flow path for the circulation of a heat exchange medium is provided within the support plate, the heat exchange medium is used to regulate the temperature of the battery cell, the flow paths of the plurality of support plates are in communication via a connecting portion, and the connecting portion is an insulating member.

20. In two adjacent battery cell groups mounted on two adjacent support plates, the maximum potential difference between the cases of two adjacent battery cells belonging to each of the two adjacent battery cell groups is U1, and the resistance of the heat exchange medium in the connection is R3. The battery according to claim 19, characterized in that it satisfies 0.05 V / kΩ ≤ U1 / R3 ≤ 400 V / kΩ, where R3 = ρL / S, where ρ is the conductivity of the heat exchange medium, L is the length over which the heat exchange medium flows within the connection, and S is the cross-sectional area of ​​the connection.

21. The battery according to claim 20, characterized in that 50V ≤ U1 ≤ 400V and 1kΩ ≤ R3 ≤ 1000kΩ.

22. The battery according to claim 20 or 21, characterized in that 0.05 V / kΩ ≤ U1 / R3 ≤ 200 V / kΩ.

23. The battery according to any one of claims 1 to 22, wherein the side wall of the battery cell provided with the pressure release mechanism is connected to the support plate, and the support plate has a relief structure installed opposite to the pressure release mechanism.

24. The relief structure corresponds one-to-one with the pressure release mechanism, Alternatively, the battery according to claim 23, characterized in that each of the relief structures corresponds to a plurality of pressure release mechanisms.

25. The battery according to claim 23 or 24, characterized in that the relief structure includes a through hole provided in the support plate.

26. The battery according to any one of claims 23 to 25, characterized in that the relief structure includes a relief groove provided in the support plate, and the opening of the relief groove faces the pressure release mechanism.

27. The battery according to claim 26, characterized in that the depth of the relief groove is H, satisfying 2 mm ≤ H ≤ 10 mm, and / or the thickness of the bottom wall of the relief groove is h, satisfying 0.1 mm ≤ h ≤ 2 mm.

28. The battery according to any one of claims 23 to 27, characterized in that a plurality of support plates are installed, the plurality of support plates are installed spaced apart from each other, and the relief structure includes a relief gap between two adjacent support plates.

29. A power consumption device characterized by including a battery according to any one of claims 1 to 28 for supplying electrical energy.

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