Batteries and electrical devices

Abstract

The present invention relates to a battery and an electrical device, which belongs to the battery technology field. The battery comprises a housing having a cavity, a plurality of battery cell groups housed in the cavity, the battery cell groups comprising a plurality of battery cell groups including a plurality of arranged battery cells, a plurality of support plates attached to the cavity, the plurality of support plates being spaced apart from each other and being made of metal plates, the battery cell groups being attached to the support plates such that the support plates support a plurality of battery cells, each support plate comprising a plurality of support plates supporting at least one battery cell group, and a connecting plate provided between the side of the support plate away from the battery cell group and the housing, the connecting plate being an insulating material and connecting plates being connected to the support plates and the housing, respectively.

Description

[Technical Field]

[0001] [Cross-reference of related applications] This application is filed pursuant to Chinese patent application No. 202311419343.7, 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] This application relates to the battery technology field, and more specifically, to batteries and electrical devices. [Background technology]

[0003] Generally, in batteries, if two battery cells experience thermal runaway simultaneously, the insulation design between the battery cells and the support plate is destroyed. This makes the two battery cells more susceptible to electrical conductivity through the support plate, leading to a short circuit and even high-voltage explosion and ignition, posing a safety hazard. [Overview of the Initiative]

[0004] This application provides a battery and electrical device to solve the problem of safety hazards caused by thermal runaway of two battery cells within a battery, which can easily lead to short circuits, overheating, and even ignition.

[0005] According to a first aspect, an embodiment of the present application provides a battery, the battery comprising a housing having a cavity, a plurality of battery cell groups housed in the cavity, the battery cell groups comprising a plurality of battery cell groups including a plurality of arranged battery cells, and a plurality of support plates attached to the cavity, the plurality of support plates being spaced apart from each other, the battery cell groups being attached to the support plates such that the support plates support a plurality of the battery cells, each of the support plates comprising a plurality of support plates supporting at least one of the battery cell groups, and a connecting plate provided between the side of the support plate away from the battery cell group and the housing, the connecting plate being an insulating member and connecting plates being connected to the support plates and the housing, respectively.

[0006] In the above technical solution, by separating the support plates from each other, different support plates are insulated relatively, and even if two battery cells located on different support plates experience thermal runaway, the probability of conduction through the support plates is low. As a result, the probability that any two battery cells in the battery form a short - circuit due to thermal runaway is reduced, the risk of high - voltage breakdown and ignition is reduced, the safety performance of the battery is improved. By installing the connection plate, the difficulty of manufacturing and processing is low, assembly is easy, manufacturing costs are reduced, multiple battery cell groups are insulated from the housing, the probability of two - point insulation failure of the battery is reduced, and the safety performance can be improved.

[0007] In some embodiments, the support plate is a metal plate, and the support plate is installed at a distance from the housing.

[0008] In the above technical solution, by installing the support plate as a metal plate, the heat conduction efficiency of the support plate is improved, and the metal plate can be made into a water - cooled plate capable of heat exchange with the battery cell, improving the operation efficiency and operation stability of the battery cell.

[0009] In some embodiments, a plurality of the battery cell groups are installed, and the plurality of battery cell groups are installed in one - to - one correspondence with the plurality of support plates.

[0010] In the above technical solution, the arrangement and assembly of the battery cell group and the support plate are facilitated, the arrangement density of the plurality of battery cells on the support plate is increased, and management is convenient.

[0011] In some embodiments, at least one of the connection plates has a protrusion, and the protrusion extends into the gap between two adjacent support plates.

[0012] In the above technical solution, by installing a protrusion on the connection plate, the insulation design between different support plates is more stable, improving the safety performance of the battery.

[0013] In some embodiments, the insulation resistance between two adjacent support plates is R2, and R2 satisfies R2≥1KΩ.

[0014] In the above technical solution, for the insulation resistance between two adjacent support plates, by limiting the minimum value of the insulation resistance R2 between two adjacent support plates, the insulation effect between different support plates is ensured, and the safety of the battery is improved.

[0015] In some embodiments, in the same battery cell group attached to the same support plate, the potential difference between the cases of two adjacent battery cells is U

[0016] and U i satisfies U ≤ 50V.

[0016] In the above technical solution, by setting the maximum value of the potential difference Ui between the cases of two battery cells, the probability of ignition is reduced, and the safety of the battery is improved.

[0017] In some embodiments, U i ≤ 20V.

[0018] In the above technical solution, by further limiting the range of the potential difference Ui between the cases of two adjacent battery cells in the same battery cell group on the same support plate, the risk of ignition is further reduced.

[0019] In some embodiments, in the same battery cell group attached to the same support plate, the maximum value of the potential difference between the cases of two adjacent battery cells is U max and the volume energy density of the battery cell is E, and 1.05×10 3 Wh*V / L ≤ E*U max ≤ 4×10 4 Wh*V / L is satisfied. <00001​​​​​​​​​The voltage is ≤50V.

[0022] In the above proposed technology, the maximum value U of the potential difference between the cases of two adjacent battery cells is max By limiting the range of the volumetric energy density E of the battery cell, the cost-effectiveness of the battery cell can be improved, and it will not easily cause ignition.

[0023] In some examples, 1.05*10 3 Wh*V / L≦E*U max ≤1.6*10 4 Wh*V / L, 3.5V≦U max The value is ≤20.

[0024] In the above technical proposal, E*U max and U max Further limiting the scope will improve battery safety.

[0025] In some embodiments, the support plate is provided with a flow path for a heat exchange medium to circulate, the heat exchange medium is used to regulate the temperature of the battery cell, the flow paths of the multiple support plates are connected via a connecting portion, and the connecting portion is an insulating member.

[0026] In the above proposed technology, when ensuring insulation, the thermal management design of the battery cell becomes easier by connecting the flow paths of each support plate.

[0027] In some embodiments, in two adjacent groups of battery cells mounted on two adjacent support plates, the maximum potential difference between the cases of the two adjacent battery cells belonging to each of the two adjacent groups of battery cells is U1, the resistance of the heat exchange medium in the connection is R3, and the condition 0.05V / kΩ ≤ U1 / R3 ≤ 400V / kΩ is satisfied, where R3 = ρL / S, where ρ is the conductivity of the heat exchange medium, L is the length through which the heat exchange medium flows in the connection, and S is the cross-sectional area of ​​the connection.

[0028] The above proposed technology ensures safety performance when connection points are installed and controls manufacturing costs by limiting the range of U1 / R3.

[0029] In some embodiments, 50V ≤ U1 ≤ 400V and 1kΩ ≤ R3 ≤ 1000kΩ.

[0030] 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.

[0031] In some embodiments, 0.05V / kΩ ≤ U1 / R3 ≤ 200V / kΩ.

[0032] The above proposed technology enhances battery safety by limiting the range of U1 / R3 values.

[0033] 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.

[0034] In the above proposed technology, by installing a relief structure on the support plate, the smooth release of the pressure release mechanism becomes easier, thereby improving the safety performance of the battery.

[0035] In some embodiments, the relief structure corresponds one-to-one with the pressure release mechanism.

[0036] Alternatively, each of the relief structures corresponds to a plurality of the pressure release mechanisms.

[0037] In some embodiments, the relief structure includes through holes provided in the support plate.

[0038] In the above proposed technology, safety is ensured by installing through holes to effectively release the pressure released by the pressure release mechanism.

[0039] In some embodiments, the relief structure includes a relief groove provided in the support plate, the opening of which faces the pressure release mechanism.

[0040] The above proposed technology ensures safety and reduces the difficulty of processing by installing relief grooves to effectively release the pressure release mechanism.

[0041] 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.

[0042] In the above proposed technology, the design parameters of the relief groove are limited to ensure that the pressure release mechanism can operate normally and thus ensure the safety of the battery.

[0043] In some embodiments, the relief structure includes a relief gap between two adjacent support plates.

[0044] In the above proposed technology, the installation of a relief gap allows the pressure release mechanism to function, resulting in simple manufacturing and processing, and is advantageous in reducing manufacturing costs.

[0045] According to a second aspect, an embodiment of the present application provides an electrical device, the electrical device including a battery as described in any of the above embodiments for providing electrical energy.

[0046] In the above-described technology, by using the battery described in the above embodiment, the risk of multiple battery cells thermally running out and forming a short circuit is reduced, the risk of high-voltage breakdown and ignition is reduced, the safety of the battery is improved, and further the safety and stability of use of the electrical device can be improved. [Brief explanation of the drawing]

[0047] 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.

[0048] [Figure 1] This is a schematic diagram of the structure of a vehicle according to several embodiments of this application. [Figure 2] This is one of the exploded view diagrams of the battery structure according to several embodiments of this application. [Figure 3] This is one schematic diagram of a cross-sectional structure of a battery according to several embodiments of this application. [Figure 4] This is a magnified view of area C in Figure 3. [Figure 5] This is a schematic diagram of the cross-sectional structure of a battery according to several embodiments of this application, part 2. [Figure 6] This is a magnified view of area D in Figure 5. [Figure 7] This is the second of the exploded view diagrams of the battery structure according to several embodiments of this application. [Figure 8] This is schematic diagram 3 of the cross-sectional structure of a battery according to several embodiments of this application. [Figure 9] This is diagram 3 of the exploded view of the battery structure according to several embodiments of this application. [Figure 10] This is one of the exploded views of a partial structure of a battery according to several embodiments of this application. [Figure 11] This is part 2 of the exploded view of a battery structure according to several embodiments of this application. [Figure 12] This is part 3 of the exploded view of a battery structure according to several embodiments of this application. [Figure 13] This is one schematic diagram of a partial cross-sectional structure of a battery according to several embodiments of this application. [Figure 14] This is a magnified view of area E in Figure 13. [Figure 15] This is part 4 of the exploded view of a battery structure according to several embodiments of this application. [Figure 16] This is part 5 of the exploded view of a battery structure according to several embodiments of this application. [Modes for carrying out the invention]

[0049] 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.

[0050] 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 intended to distinguish different subjects and are not intended to describe a particular order or hierarchical relationship.

[0051] The “Examples” as used in this application mean that certain features, structures, or properties described in conjunction with the Examples may be included in at least one Example of this Application. The use of the “Examples” 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.

[0052] 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.

[0053] 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.

[0054] 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).

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 the embodiments of this application are not limited to these.

[0059] 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.

[0060] In typical batteries, multiple battery cells are usually stacked and arranged in a sequence within the battery housing to obtain sufficient power. However, battery cells can experience thermal runaway due to various factors during use, such as pressure, impact, and aging. After thermal runaway, the insulating film between the battery cell and the support plate easily melts and fails, resulting in a poor insulation design between the battery cell and the support plate. If two single batteries experience thermal runaway, they will connect via the support plate, forming a short circuit, which can lead to a battery short circuit and even high-voltage breakdown and ignition, posing a significant safety hazard.

[0061] Based on the above considerations, in order to solve the problem of short-circuit overheating and even ignition being likely to occur due to thermal runaway of two battery cells in a battery, thereby posing a safety risk, this application designs a battery comprising a housing, a plurality of support plates, and a plurality of battery cell groups, wherein the housing has a cavity, the plurality of battery cells are housed in the cavity, the battery cell group comprises a plurality of arranged battery cells, the plurality of support plates are attached to the cavity, the plurality of support plates are installed spaced apart from each other, and the battery cell groups are attached to the support plates such that the support plates support the plurality of battery cells, and each support plate supports at least one battery cell group.

[0062] In this battery structure, multiple support plates are installed spaced apart, insulating different support plates from one another. Even if two battery cells located on different support plates experience thermal runaway, the probability of conductivity through the support plates is low. This reduces the risk of multiple battery cells experiencing thermal runaway and forming a short circuit, thereby improving the safety performance of the battery.

[0063] Embodiments of this application provide an electrical device that uses a battery as a power source, which 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 portable 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.

[0064] In the following embodiments, for the sake of clarity, the electrical device of one embodiment of this application will be described as a vehicle 1 as an example.

[0065] 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 power the vehicle 1, for example, as an operating power source for the vehicle 1, 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 2, the battery cell 111 is rectangular in shape.

[0071] According to some embodiments of this application, as shown in Figures 2 to 16, specifically referring to Figure 2, an embodiment of this application provides a battery 10, which may include a housing 12, a plurality of battery cell groups 11, a plurality of support plates 13 and a connecting plate 14.

[0072] The housing 12 may have a cavity 124, and a plurality of battery cell groups 11 may be housed in the cavity 124, and the battery cell groups 11 may include a plurality of arranged battery cells 111, and a plurality of support plates 13 may be mounted in the cavity 124, and the plurality of support plates 13 may be spaced apart from each other, and the support plates 13 may be metal plates, and the battery cell groups 11 may be mounted on the support plates 13 such that the support plates 13 support a plurality of battery cells 111, and each support plate 13 supports at least one battery cell group.

[0073] The housing 12 may be the housing 12 of the previously described embodiment, and a detailed explanation is 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.

[0074] Multiple support plates 13 are mounted inside the cavity 124, and the battery cell group 11 is attached to the support plates 13. The battery cell group 11 may also be fixedly connected to the support plates 13 by adhesive, thereby connecting the multiple battery cells 111 to the housing 12 via the support plates 13. The support plates 13 may be made of metal or plastic.

[0075] 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.

[0076] Each support plate 13 may be installed spaced apart from each other and relatively insulated from one another. This reduces the probability of conductivity through the support plates 13 if battery cells 111 located on different support plates 13 experience thermal runaway, thereby reducing the risk of short circuits or high-voltage breakdown and ignition caused by two battery cells 111 experiencing thermal runaway simultaneously, and improving the safety of the battery 10.

[0077] As shown in Figures 2 to 16, for details refer to Figures 2 and 3, the battery 10 may further include a connecting plate 14, which may be installed between the side of the support plate 13 away from the battery cell group 11 and the housing 12, and the connecting plate 14 may be an insulating material and is connected to the support plate 13 and the housing 12, respectively.

[0078] The support plate 13 may be installed spaced apart from the housing 12 along its thickness direction, 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. Specifically, the connecting plate 14 can be fixed to the support plate 13 by adhesive, and the connecting plate 14 can be fixed to the housing 12 by adhesive, thereby relatively fixing the support plate 13 and the housing 12.

[0079] 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.

[0080] In the actual execution process, first, multiple support plates 13 are installed spaced apart within the cavity, and then multiple battery cell groups 11 are attached to the multiple support plates 13. Here, each support plate 13 may support at least one battery cell group 11, and as can be understood, multiple battery cell groups 11 may be attached to a single support plate 13. The specific number is not limited here. Because each support plate 13 is spaced apart from each other and different support plates 13 are relatively insulated, even if two battery cells 111 located on different support plates 13 experience thermal runaway, the probability of conductivity through the support plates 13 is small.

[0081] In the battery 10 according to the embodiment of this application, by spacing the support plates 13 apart from each other and insulating the different support plates 13 relative to each other, even if two battery cells 111 located on different support plates 13 experience thermal runaway, the probability of conductivity through the support plates 13 is reduced. This reduces the probability that any two battery cells 111 in the battery 10 will experience thermal runaway and form a short circuit, thereby reducing the risk of high-voltage breakdown and ignition, improving the safety performance of the battery 10. Furthermore, by installing the connection 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 in the battery 10 is reduced by insulating the multiple battery cell groups 11 from the housing, thereby improving the safety performance.

[0082] According to some embodiments of this application, the support plate 13 may be a metal plate, and the support plate 13 may be installed at a distance from the housing 12.

[0083] In this embodiment, the support plate 13 may be a metal plate, and since metal plates have excellent thermal conductivity, the support plate 13 may be installed as a water cooling plate to control the temperature of the multiple battery cells 111. Specifically, a flow path may be provided inside the support plate 13, and by circulating a heat exchange medium in the flow path, the temperature of the battery cell group 11 can be adjusted, improving the operating efficiency and stability of the battery 10. Furthermore, by installing the support plate 13 at a distance from the housing 12, the support plate 13 is insulated from the housing 12, reducing the probability that the battery cells 111 will become electrically connected to the housing 12 via the support plate 13 in the event of thermal runaway, thereby reducing safety risks.

[0084] In the battery 10 according to the embodiment of this application, the support plate is installed as a metal plate to improve the thermal conductivity of the support plate, and the metal plate may be made as a water-cooled plate capable of exchanging heat with the battery cell, thereby improving the operating efficiency and operating stability of the battery cell.

[0085] In some embodiments, the insulation resistance between the support plate 13 and the housing 12 is R1, and R1 ≥ 1 MΩ can be satisfied. Selectively, R1 may be 1 MΩ, 2 MΩ, 3 MΩ, 5 MΩ, 10 MΩ, or other resistance values ​​greater than 1 MΩ, but is not limited thereto.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] According to some embodiments of this application, as shown in Figures 5 and 6, at least one connecting plate 14 has a projection 141, the projection 141 extending into the gap between two adjacent support plates 13.

[0090] 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.

[0091] 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.

[0092] According to the embodiment of this application, by providing the projection 141 on the connecting plate 14, the insulation design between different support plates becomes more stable, and the safety performance of the battery 10 is improved.

[0093] 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.

[0094] 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. 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.

[0095] Here, the minimum value of the insulation resistance R2 between two adjacent support plates 13 is 1 kΩ, and R2 may be 1 kΩ, 10 kΩ, 100 kΩ, 1000 kΩ, 2000 kΩ, 10000 kΩ, or any other resistance value greater than 1 kΩ, and is not specifically limited here.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] Potential difference U between the cases of the two battery cells 111 i By limiting the maximum value, the probability of ignition is reduced, and the safety of battery 10 is improved.

[0100] Here, the potential difference U between the cases of two adjacent battery cells 111 iThis may be 50V, 45V, 40V, 30V, 20V, 10V, or any other value less than 50V, and is not specifically limited here.

[0101] According to some embodiments of this application, U i The voltage is ≤20V.

[0102] In this embodiment, the potential difference U between the cases of two adjacent battery cells 111 in the same battery cell group 11 of the same support plate 13 is i Further limiting the scope reduces the risk of ignition.

[0103] 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.

[0104] 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 It may also be that the volumetric energy density of the battery cell 111 is E, and 1.05*10 3 Wh*V / L≦E*U max ≤4*10 4 The Wh*V / L ratio can be satisfied.

[0105] 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.

[0106] Referring to Table 1, Table 1 shows the behavior of two adjacent battery cells 111 after thermal runaway when the battery cells 111 have different volumetric energy densities and different maximum potential differences.

[0107] According to Table 1, in Comparative Examples 1-3, E*U max When the voltage is greater than 40,000 Wh*V / L, 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, E*U max When equal to 40000Wh*V / L, two adjacent battery cells 111 in the same battery cell group 11 experience a minor short circuit after thermal runaway, generating heat but not causing a fire. This is the maximum critical point, E*U max ≤4*10 4 In the case of Wh*V / L, there is no risk of ignition, making it relatively safe.

[0108] [Table 1]

[0109] 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.

[0110] Here, E*U max The range of values ​​is [1050Wh*V / L, 40000Wh*V / L], specifically E*U max This can be 1050Wh*V / L, 3000Wh*V / L, 5000Wh*V / L, 6000Wh*V / L, 7500Wh*V / L, 8000Wh*V / L, 10000Wh*V / L, 16000Wh*V / L, 32000Wh*V / L, 40000Wh*V / L, or any other value between 1050Wh*V / L and 40000Wh*V / L.

[0111] According to the embodiment of this application, by limiting the maximum and minimum values ​​of E*Umax, 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.

[0112] 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 It may be that the volumetric energy density of battery cell 111 is E, and 300Wh / L≦E≦800Wh / L, 3.5V≦U max It can satisfy the condition ≤ 50V.

[0113] 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.

[0114] According to the test data in Table 1, when the values ​​are 300Wh / L ≤ E ≤ 800Wh / L and 3.5V ≤ Umax ≤ 50V, battery 10 is cost-effective and does not easily cause fire.

[0115] Here, the range of the volumetric energy density E of the battery cell 111 is [300 Wh / L, 800 Wh / L], and specifically, the value of 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 here.

[0116] Here, the maximum value U of the potential difference between two adjacent battery cells 111 in the same battery cell group 11. max The voltage is [3.5V, 50V], and specifically, U max The value 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.

[0117] According to the embodiment of this application, the maximum value U of the potential difference between the cases of two adjacent battery cells 111max 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.

[0118] According to some embodiments of this application, 1.05*10 3 Wh*V / L≦E*U max ≤1.6*10 4 Wh*V / L, 3.5 ≤ Umax ≤ 20V.

[0119] In this embodiment, E*U max The range of values ​​is [1050Wh*V / L, 16000Wh*V / L], and referring to Table 1, within this range, the risk of minor short circuits and overheating after thermal runaway in two adjacent battery cells 111 in the same battery cell group 11 is low, the probability of ignition is lower, and the safety is higher. Specifically, E*U max This can be 1050Wh*V / L, 3000Wh*V / L, 5000Wh*V / L, 6000Wh*V / L, 7500Wh*V / L, 8000Wh*V / L, 10000Wh*V / L, 16000Wh*V / L, or any other value between 1050Wh*V / L and 16000Wh*V / L.

[0120] In this embodiment, U max The range of values ​​is [3.5V, 20V], and within this range, 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 a fire is lower, and the safety is higher. Specifically, 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.

[0121] 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.

[0122] According to some embodiments of this application, as shown in Figures 7 and 8, 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.

[0123] 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.

[0124] 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.

[0125] In the actual execution process, referring to Figures 7 and 8, 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.

[0126] 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.

[0127] 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, the resistance of the heat exchange medium in the connection part 15 is R3, and 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 through which the heat exchange medium flows in the connection part 15, and S is the cross-sectional area of ​​the connection part 15.

[0128] 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.

[0129] 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 heat exchange medium failure is high. Similarly, when the resistance of the heat exchange medium in the connection part 15 is low, the probability of failure due to the heat exchange medium is high.

[0130] 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.

[0131] 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 cells 111 belonging to two adjacent battery cell groups 11 mounted on two adjacent support plates 13. Referring to Table 2, Table 2 shows the behavior after thermal runaway of two adjacent battery cells 111 belonging to two adjacent battery cell groups 11 mounted on two adjacent support plates 13 for different U1 / R3 values.

[0132] [Table 2]

[0133] 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.

[0134] Furthermore, considering the actual manufacturing and processing costs, a minimum value exists in U1 / R3, which is 0.05V / kΩ.

[0135] Here, the range of the value of U1 / R3 is [0.05V / KΩ, 400V / KΩ], and specifically, the value of U1 / R3 may be 0.05V / KΩ, 0.2V / KΩ, 0.4V / KΩ, 0.5V / KΩ, 2V / KΩ, 4V / KΩ, 50V / KΩ, 200V / KΩ, 400V / KΩ, or any other value between 0.05V / KΩ and 400V / KΩ, and is not specifically limited to these values.

[0136] 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.

[0137] According to some embodiments of this application, 50V ≤ U1 ≤ 400V and 1KΩ ≤ R3 ≤ 1000KΩ.

[0138] 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 causing high-voltage breakdown. 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.

[0139] 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.

[0140] Here, the range of the value of U1 is [50V, 400V], and specifically, U1 may be 50V, 100V, 150V, 200V, 250V, 300V, 400V, or any other value between 50V and 400V, and is not specifically limited to these values.

[0141] Here, the range of R3 is [1kΩ, 1000kΩ], and specifically, R3 may be 1kΩ, 10kΩ, 100kΩ, 300kΩ, 500kΩ, 800kΩ, 1000kΩ, or any other value between 1kΩ and 1000kΩ, and is not specifically limited to these values.

[0142] 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.

[0143] According to some embodiments of this application, 0.05V / kΩ ≤ U1 / R3 ≤ 200V / kΩ.

[0144] In this embodiment, the range of the value of U1 / R3 is [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.

[0145] Specifically, 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 any other value between 0.05V / KΩ and 200V / KΩ, and is not specifically limited to these values ​​here.

[0146] According to the range of U1 / R3 values ​​in the embodiments of this application, the safety of the battery 10 is higher.

[0147] According to some embodiments of this application, as shown in Figures 9 to 16, 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.

[0148] 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.

[0149] 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 to the pressure release mechanism 1111, the support plate 13 plays a role in releasing pressure from the pressure release mechanism 1111, allowing the support plate 13 to support the battery cell group 11, and enabling the pressure release mechanism 1111 to open smoothly, thereby improving the safety of the battery 10.

[0150] 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.

[0151] 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.

[0152] In one example, as shown in Figures 9 and 10, multiple relief structures 134 may be installed on each support plate 13, where 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 role in releasing pressure from each pressure release mechanism 1111, reducing mutual influence between the pressure release mechanisms 1111, and improving stability.

[0153] In another example, as shown in Figures 11 to 16, if 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 provide relief for the multiple pressure release mechanisms 1111, and facilitates the processing of the support plate 13.

[0154] According to some embodiments of this application, as shown in Figures 9 and 10, the relief structure 134 may include through holes 1341 provided in the support plate 13.

[0155] 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 releases the pressure from the operation of the pressure release mechanism 1111 and ensures safety.

[0156] According to some embodiments of this application, as shown in Figures 11 to 14, the relief structure 134 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.

[0157] In this embodiment, the relief structure 134 may include a relief groove 1342 provided in the support plate 13, with the opening of the relief groove 1342 positioned toward the pressure release mechanism 1111, thereby allowing the pressure release mechanism 1111 to move into the relief groove 1342 when released, thus fulfilling the role of releasing 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.

[0158] 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.

[0159] 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 breaking through 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 break through the bottom wall of the relief groove 1342 and be smoothly discharged into the housing 12.

[0160] To make it clear, 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.

[0161] In this embodiment, the range of the depth H of the relief groove 1342 is [2mm to 10mm], and specifically, the value of the depth H of the relief groove 1342 may be 2mm, 4mm, 6mm, 8mm, 10mm, or any other value between 2mm and 10mm, and is not limited thereto. The thickness h of the bottom wall of the relief groove 1342 is [0.1mm to 2mm], and specifically, the value of the thickness h of the bottom wall of the relief groove 1342 may be 0.1mm, 0.4mm, 0.8mm, 1.2mm, 1.6mm, 2mm, or any other value between 0.1mm and 2mm, and is not limited thereto.

[0162] 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 and the safety of the battery 10 is ensured.

[0163] According to some embodiments of this application, as shown in Figures 15 and 16, the relief structure 134 may include a relief gap 1343 between two adjacent support plates.

[0164] In this embodiment, by installing multiple support plates 13, each support plate 13 is spaced apart from each other to form relief gaps 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, and the relief structure 134 may include the relief gap 1343 between two adjacent support plates. The relief gap 1343 plays a role in releasing the pressure release mechanisms 1111, and is easy to manufacture and process, which is advantageous in reducing manufacturing costs.

[0165] According to some embodiments of this application, the present application further provides an electrical device which includes a battery 10 of any of the above technical proposals for supplying electrical energy.

[0166] The electrical device may be any of the aforementioned devices or systems that use the battery 10.

[0167] According to the first embodiment of this application, as shown in Figures 2 to 4, this application provides a battery 10 which includes a housing 12, a plurality of battery cell groups 11, a plurality of support plates 13, and a plurality of connection plates 14.

[0168] 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.

[0169] Multiple battery cell groups 11 are housed within a cavity 124, and each battery cell group 11 includes multiple arranged battery cells 111.

[0170] Multiple support plates 13 are installed inside the cavity 124, and multiple battery cell groups 11 correspond one-to-one with the multiple support plates 13. Each support plate 13 is installed spaced apart from the others, and the support plates 13 are installed spaced apart from the housing 12. Here, the support plates 13 are metal plates, and the battery cell groups 11 are attached to the support plates 13, with the support plates 13 supporting the multiple battery cells 111.

[0171] The connecting plate 14 is provided between the side of the support plate 13 facing away from the battery cell group 11 and the housing. The connecting plate 14 is an insulating member, and thereby insulates the support plate 13 from the housing 12, insulating the multiple battery cells 111 relative to the housing 12. The insulation resistance between the support plate 13 and the housing 12 is R1 ≥ 1 MΩ, and each support plate 13 is insulated from the others.

[0172] The insulation resistance between two adjacent support plates 13 is R2 ≥ 1 kΩ. 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 ≤ 50 V, and in the embodiment U i The voltage is ≤20V.

[0173] 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. 1.05*10 3 Wh*V / L≦E*U max ≤4*10 4 Wh*V / L, 300Wh / L≦E≦800Wh / L, 3.5V≦U max Satisfy ≤50V. In the example, 1.05*10 3 Wh*V / L≦E*U max ≤1.6*10 4 Wh*V / L, 3.5V≦U max The value is ≤20.

[0174] According to a second embodiment of this application, as shown in Figures 5 to 6, 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.

[0175] Here, the installation of the housing 12, battery cell group 11, and support plate 13 will be described in reference to the first embodiment, and repeated explanations will be omitted here.

[0176] The difference between this embodiment and the first 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, thereby isolating the two adjacent support plates 13.

[0177] According to a third embodiment of this application, as shown in Figures 7 to 8, 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.

[0178] Here, the installation of the housing 12, battery cell group 11, and connection plate 14 will be described in reference to the first embodiment, and a repeated explanation will be omitted here.

[0179] The difference between this embodiment and the first 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.

[0180] 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 each of the two adjacent battery cell groups 11 is U1, the resistance of the heat exchange medium in the connection part 15 is R3, and satisfies 0.05V / kΩ ≤ U1 / R3 ≤ 400V / kΩ, 50V ≤ U1 ≤ 400V, and 1KΩ ≤ R3 ≤ 1000KΩ. In the embodiment, 0.05V / kΩ ≤ U1 / R3 ≤ 200V / kΩ.

[0181] 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, a support plate 13, and a connecting plate 14.

[0182] Here, the installation of the housing 12, battery cell group 11, and connection plate 14 will be described in reference to the first embodiment, and a repeated explanation will be omitted here.

[0183] The difference between this embodiment and the first embodiment is that a pressure release mechanism 1111 is provided on the side wall connected to the support plate 13 of multiple battery cells 111 in the battery cell group 11, multiple through holes 1341 are provided in the support plate 13, the multiple through holes 1341 correspond one-to-one with the pressure release mechanisms 1111 of the multiple battery cells 111 on the support plate 13, and the cross-sectional size of the through holes 1341 is greater than or equal to the cross-sectional size of the corresponding pressure release mechanism 1111.

[0184] According to the fifth embodiment of this application, as shown in Figures 11 to 14, 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.

[0185] 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.

[0186] The difference between this embodiment and the fourth embodiment is that the support plate 13 is provided with at least one relief groove 1342 instead of multiple through holes 1341, 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 satisfies 2 mm ≤ H ≤ 10 mm, and the thickness h of the bottom wall of the relief groove 1342 satisfies 0.1 mm ≤ h ≤ 2 mm.

[0187] According to the sixth embodiment of this application, as shown in Figures 15 to 16, 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.

[0188] Here, the installation of the housing 12, battery cell group 11, and connection plate 14 will be described in reference to the first embodiment, and a repeated explanation will be omitted here.

[0189] The difference between this embodiment and the first embodiment is that the multiple support plates 13 are spaced apart from each other to form relief gaps 1343, and the pressure release mechanisms 1111 of the multiple battery cells 111 of the battery cell group 11 correspond to the relief gaps 1343.

[0190] 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.

[0191] The foregoing are merely examples of the present application and are not intended to limit this application. Those skilled in the art will know that this application is subject to various modifications and changes. 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]

[0192] 1 vehicle 10 batteries 20 motors 30 controllers 11 Battery cell group 111 battery cells 1111 Pressure release mechanism 12 cabinets 121 Bottom plate 122 Top Cover 123 frames 124 Cavity 13 Support plate 133 Channels 134 Relief structure 1341 Through hole 1342 Relief groove 1343 Escape gap 14 Connection Plate 141 Protrusion 15. Connection point.

Claims

1. It is a battery, A housing having a cavity, A plurality of battery cell groups housed in the cavity, wherein the battery cell group includes a plurality of battery cell groups that are arranged in a plurality of battery cells, A plurality of support plates attached to the cavity, wherein the plurality of support plates are spaced apart from each other, and the battery cell group is attached to the support plates such that the support plates support the plurality of battery cells, and each support plate supports at least one of the plurality of support plates, A battery characterized by a connecting plate provided between the side of the support plate away from the battery cell group and the housing, wherein the connecting plate is an insulating member and includes connecting plates connected to the support plate and the housing, respectively.

2. The battery according to claim 1, characterized in that the support plate is a metal plate, and the support plate is installed at a distance from the housing.

3. The battery according to claim 1, characterized in that the plurality of battery cell groups are installed in a one-to-one correspondence with the plurality of support plates.

4. The battery according to claim 1, characterized in that at least one of the connecting plates has a projection, the projection extending into the gap between two adjacent support plates.

5. The battery according to any one of claims 1 to 4, characterized in that the insulation resistance between two adjacent support plates is R2, and R2 ≥ 1 kΩ.

6. 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 1 to 4, characterized in that it satisfies ≤ 50V.

7. U ｉ The battery according to claim 6, characterized in that it is ≤20V.

8. 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, and 1.05 * 10 ３ Wh*V / L≦E*U ｍａｘ ≤ 4 * 10 ４ A battery according to any one of claims 1 to 4, characterized in that it satisfies Wh*V / L.

9. 300Wh / L≦E≦800Wh / L, 3.5V≦U ｍａｘ The battery according to claim 8, characterized in that it is ≤ 50V.

10. 1.05 * 10 ３ Wh * V / L ≤ E * U ｍａｘ ≤ 1.6 * 10 ４ Wh * V / L, 3.5 ≤ U ｍａｘ ≤ 20 V, the battery according to claim 8, characterized in that.

11. The battery according to any one of claims 1 to 4, 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 connected via a connecting portion, and the connecting portion is an insulating member.

12. 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 11, 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.

13. The battery according to claim 12, characterized in that 50V ≤ U1 ≤ 400V and 1kΩ ≤ R3 ≤ 1000kΩ.

14. The battery according to claim 12, characterized in that 0.05V / kΩ ≤ U1 / R3 ≤ 200V / kΩ.

15. The battery according to claim 1 or 2, wherein 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 to the pressure release mechanism.

16. The relief structure corresponds one-to-one with the pressure release mechanism, Alternatively, the battery according to claim 15, characterized in that each of the relief structures corresponds to a plurality of pressure release mechanisms.

17. The battery according to claim 15, characterized in that the relief structure includes a through hole provided in the support plate.

18. The battery according to claim 15, 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.

19. The battery according to claim 18, 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.

20. The battery according to claim 15, characterized in that the relief structure includes a relief gap between two adjacent support plates.

21. An electrical device characterized by including a battery according to any one of claims 1 to 20 for supplying electrical energy.

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