Battery case, battery pack having the same, and vehicle

Abstract

A battery case, and a battery pack and a vehicle having the same, wherein the battery case (100) includes a metal frame (10) in which a plurality of accommodating cavities (101) for accommodating cells (500) are formed, and an insulating coating layer (40) is provided on the inner surface of the accommodating cavity (100), and a thickness D of the insulating coating layer satisfies formula (I), where I is a test current, V is a test voltage, p is a volume resistivity of the insulating coating layer, D is a sprayed thickness of the insulating coating layer, and A is a total sprayed area of ​​the insulating coating layer.

Description

Technical Field

[0001] (Cross - reference to related applications) This application is filed based on and claims priority to a Chinese patent application with an application number of 202121466144.8 and an application date of June 30, 2021, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, and particularly to battery cases, battery packs having the same, and vehicles.

Background Art

[0003] In related technologies, cells of many battery packs are all coated with a PET insulating film (heat - resistant polyester film) to be insulated from an aluminum housing or end plates and side plates. The PET film is generally adhesively fixed to the cells by a pressure - sensitive adhesive or, by a hot - press process, the PET is hot - pressed onto the side plates and end plates. However, in this technical means, since it is necessary to coat an insulating film on each cell, the operation is complicated, wrinkles are likely to occur in the coated film, which affects the assembly.

Summary of the Invention

[0004] This application aims to solve at least one of the technical problems in the prior art. For this purpose, this application aims to provide a battery case with a simple structure, which is surely insulated from cells and does not affect the assembly of cells.

[0005] This application further provides a battery pack having the above - mentioned battery case.

[0006] This application further provides a vehicle having the above - mentioned battery pack.

[0007] The battery case according to the first aspect of the present application includes a metal frame in which a plurality of accommodation cavities for accommodating cells are formed. The plurality of accommodation cavities are arranged at intervals, and an insulating coating layer is provided on the inner surface of the accommodation cavity. The thickness D of the insulating coating layer satisfies [Number] wherein I is the test current in amperes, V is the test voltage in volts, p is the volume resistivity of the insulating coating layer in Ω·m, D is the Thickness of the insulating coating layer in meters, and A is the Total area of the insulating coating layer in m 2 . In some embodiments, the test voltage V is 3000 volts or more, and the test current I is less than 1 milliampere.

[0008] The battery case according to the present application provides a plurality of accommodation cavities arranged at intervals and an insulating coating layer on the inner surface of the accommodation cavity, thereby improving the insulation effect between the battery case and the cells, reducing the risk of insulation failure, and improving the safety performance of the battery pack.

[0009] In a specific example of the present application, the elongation at break of the insulating coating layer is greater than 100%.

[0010] In a specific example of the present application, the thickness of the insulating coating layer is 0.05 mm to 0.3 mm.

[0011] In a specific example of the present application, the insulating coating layer is a polyurethane coating layer.

[0012] In a specific example of the present application, the metal frame includes a housing and a plurality of partition plates. The housing has at least one end open in a first direction, and the plurality of partition plates are provided in the housing, extend along the first direction, and are arranged at intervals in a second direction perpendicular to the first direction to partition the internal space of the housing into a plurality of the accommodation cavities.

[0013] In a specific example of the present application, the height of each of the accommodation cavities is 0.1 m to 0.13 m.

[0014] In a specific example of the present application, the Area of the insulating coating layer in each of the accommodation cavities 2 is 0.1 m 2 to 0.5 m.

[0015] The battery pack according to the second aspect of the present application includes the battery case according to the first aspect of the present application and a cell provided in the accommodation cavity.

[0016] By providing the battery case of the first aspect, the battery pack according to the present application can improve the insulation effect between the battery case and the cell, reduce the risk of insulation failure, and improve the safety performance of the battery pack, thereby improving the overall performance of the battery pack.

[0017] In a specific example of the present application, the cell is a pouch cell, a plurality of the pouch cells are provided in the accommodation cavity, the plurality of pouch cells are arranged along a first direction and are directly connected, and the battery pack further includes an insulating film coated on the outside of the plurality of pouch cells.

[0018] The vehicle according to the third aspect of the present application includes the battery pack according to the second aspect of the present application.

[0019] By providing the battery pack of the second aspect, the vehicle according to the third aspect of the present application can improve the overall performance of the vehicle.

[0020] Some of the additional aspects and advantages of the present application are shown in the following description, some will become apparent in the following description, or will be understood by the implementation of the present application.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present application will be described in detail. Examples of the above embodiments are shown in the drawings, and the same or similar reference numerals throughout denote the same or similar components, or components having the same or similar functions. Hereinafter, the embodiments described with reference to the drawings are merely exemplary and are for interpreting the present application and should not be understood as limiting the present application.

[0023] Hereinafter, with reference to FIGS. 1 to 4, the battery case 100 according to an embodiment of the first aspect of the present application will be described.

[0024] As shown in FIG. 1, the battery case 100 according to an embodiment of the first aspect of the present application includes a metal frame 10 in which a plurality of accommodation cavities 101 for accommodating cells 500 are formed. The plurality of accommodation cavities 101 are arranged at intervals, and an insulating coating layer 40 is provided on the inner surface of the accommodation cavity 101. That is, a plurality of accommodation cavities 101 arranged at intervals may be formed in the battery case 100, and all of the plurality of accommodation cavities 101 accommodate cells 500. For example, a pouch cell may be placed in the accommodation cavity 101, and an insulating coating layer 40 is provided on the inner wall surface of each accommodation cavity 101. Spray painting Or applied.

[0025] In this embodiment, a plurality of accommodation cavities 101 are formed in the battery case 100, and cells 500 (for example, pouch cells) are respectively provided in each accommodation cavity 101. For example, by providing only one group (one row) of pouch cells (which may include a plurality of pouch cells connected to each other in each group) in one accommodation cavity 101, a plurality of groups of cells 500 in the battery case 100 can be separated. Therefore, the number of cell groups arranged in each accommodation cavity 101 can be made smaller, the cells 500 in each accommodation cavity 101 can be fixed more easily, the effect of fixing the cells 500 is improved, and since the plurality of groups of cells 500 are separated by different accommodation cavities 101, the heat insulation effect between the plurality of groups of cells 500 is increased. In this way, when a problem occurs in a certain group of cells 500, it does not directly affect other groups of cells 500, and the occurrence of problems in other groups of cells 500 in a chain reaction is avoided, improving the safety performance of the battery pack 1000.

[0026] Furthermore, in this embodiment, by providing an insulating coating layer 40 on the inner wall surface of each accommodation cavity 101, when the cell 500 is placed in the accommodation cavity 101, the insulating coating layer 40 can achieve the effect of electrical separation between the cell 500 and the metal frame 10 of the battery case 100, thereby ensuring the insulation effect between the battery case 100 and the cell 500. Also, since the insulating coating layer 40 is directly Spray painting applied or coated on the inner wall surface of the accommodation cavity 101, it can be ensured that the insulating coating layer 40 effectively covers the inner surface of the accommodation cavity 101. In this way, the creepage distance between the cell 500 and the metal frame 10 can be increased, and the risk of insulation failure can be reduced.

[0027] Furthermore, the thickness D of the above-mentioned insulating coating layer 40 can satisfy the following formula:

Equation

[0028] Note that the test voltage and test current are the test voltage and test current when performing an insulation performance test on the battery case 100 of this embodiment.

[0029] In this embodiment, by setting the thickness D of the insulation coating layer 40 so as to satisfy the above relational expression, the insulation coating layer 40 can meet the requirement of the insulation performance between the battery case 100 and the cell 500, reduce the risk of insulation failure, and improve the safety performance of the battery pack 1000.

[0030] Furthermore, the test voltage V is 3000 volts or more, and the test current I is less than 1 milliampere, that is, V≥3000V and I<1mA. Thereby, the insulation coating layer 40 can meet the requirement of the insulation performance between the battery case 100 and the cell 500.

[0031] The battery case 100 according to the embodiment of the present application is provided with a plurality of accommodation cavities 101 arranged at intervals, and by providing an insulation coating layer 40 on the inner surface of the accommodation cavity 101, the insulation effect between the battery case 100 and the cell 500 can be improved, not only reducing the risk of insulation failure, but also separating the cells 500 in different accommodation cavities 101 from each other, thereby improving the safety performance of the battery pack 1000. In addition, it facilitates the incorporation of the cell 500 into the accommodation cavity.

[0032] In one embodiment of the present application, the insulation coating layer 40 may be a polyurethane coating layer. That is, the insulation coating layer 40 is mainly made of a polyurethane coating layer material, and the polyurethane coating layer material has a low elastic modulus, plays a role of buffering and shock absorption for the cell 500, and can eliminate local stress concentration of the cell 500. In addition, the polyurethane coating layer can effectively cover the inner surface of the accommodation cavity 101 of the battery case 100, increase the creepage distance between the pouch cell and the metal frame 10, and reduce the risk of insulation failure.

[0033] Furthermore, in one embodiment of the present application, the elongation at break of the insulating coating layer 40 may be greater than 100%. For example, the elongation at break of the insulating coating layer 40 may be 110%, 120%, 130%, 150%, 170% or 200%, etc. In this way, the elongation at break of the insulating coating layer 40 is high. When the cell 500 is fixed in the accommodation cavity by adhesion, the insulating coating layer 40 can play a role of buffering and shock absorption with respect to the cell 500, and can eliminate local stress concentration of the cell 500.

[0034] In some embodiments of the present application, the thickness of the insulating coating layer 40 is 0.05 mm to 0.3 mm, that is, the thickness of the insulating coating layer 40 may be in the range of 0.05 mm to 0.3 mm. For example, the thickness of the insulating coating layer 40 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, etc. In this way, the user can determine the thickness of the insulating coating layer 40 so as to meet the insulation requirements of different battery packs 1000 and different cells 500 based on the voltages and currents of different battery packs 1000 and different cells 500.

[0035] In some embodiments of the present application, as shown in FIG. 1, the metal frame 10 includes a housing 1 and a plurality of partition plates 2. The housing 1 may be formed in a box shape. At least one end of the housing 1 in the first direction (for example, the front-rear direction shown in FIG. 1) may be open. The first direction may be the length direction of the housing or the width direction of the housing. For example, the housing 1 is formed in a rectangular parallelepiped box shape, and both ends of the housing 1 in the length direction are open. In other words, the housing 1 has an upper plate, a left plate, a lower plate, and a right plate that are sequentially connected so as to form a rectangular ring shape. The upper plate and the lower plate are parallel to each other and are arranged at an interval. The left plate and the right plate are parallel and are arranged at an interval. The upper plate and the left plate are perpendicular to each other.

[0036] Furthermore, the plurality of partition plates 2 are provided within the housing 1. The plurality of partition plates 2 all extend along a first direction (for example, the front-rear direction shown in FIG. 1) and are arranged at intervals in a second direction (for example, the left-right direction shown in FIG. 1) perpendicular to the first direction. The internal space of the housing 1 is partitioned into a plurality of accommodation cavities 101. In other words, an accommodation cavity 101 is defined between two adjacent partition plates. Accommodation cavities 101 may also be defined respectively between two partition plates 2 that are the outermost ones in the width direction of the housing 1 among the plurality of partition plates 2 and two side plates (for example, the left side plate and the right side plate of the housing 1) in the width direction of the housing 1. In this way, a plurality of accommodation cavities 101 can be formed within the housing 1. The plurality of accommodation cavities 101 are arranged at intervals in the width direction of the housing 1 and extend in the length direction of the housing 1. Thereby, on the premise of forming a plurality of accommodation cavities 101 arranged horizontally at intervals, the structure of the battery case 100 can be simplified and the incorporation of the cells 500 into the corresponding accommodation cavities 101 can be facilitated.

[0037] In addition, when the first direction is the length direction of the housing, the second direction is the width direction of the housing; when the first direction is the width direction of the housing, the second direction is the length direction of the housing.

[0038] In some examples, the metal frame 10 may be integrally formed. In other words, the metal frame 10 does not have a separable and removable structure. In this way, the integrity of the battery case 100 can be improved and the overall strength of the battery case 100 can be enhanced.

[0039] In some examples, the height of each accommodation cavity 101 is 0.1 m to 0.13 m, that is, the height of each accommodation cavity 101 may be in the range of 0.1 m to 0.13 m. As shown in FIG. 2, the height of the accommodation cavity 101 in the vertical direction is in the range of 0.1 m to 0.13 m. For example, the height of the accommodation cavity 101 may be 0.11 m, 0.12 m, etc. In this way, based on the number of cells 500 in the cell group, the user can adjust the size of a certain number of cells 500 connected in series to match the size of the accommodation cavity 101, and set the size of the accommodation cavity 101 so that a plurality of cells 500 in the cell group fill the accommodation cavity 101.

[0040] In some examples, the insulating coating layer 40 within each accommodation cavity 101 Area is 0.1 m 2 to 0.5 m 2 that is, the insulating coating layer 40 within each accommodation cavity 101 Area is 0.1 m 2 to 0.5 m 2 and may be in this range. For example, the insulating coating layer 40 within each accommodation cavity 101 Area is 0.2 m 2 0.3 m 2 0.4 m 2 etc. and may be such values.

[0041] As shown in FIG. 1, the battery case 100 includes a rectangular parallelepiped housing 1 and a plurality of partition plates 2 provided within the housing 1. The front side and the rear side of the housing 1 are both open. The partition plates 2 extend along the front-rear direction and are arranged at intervals in the left-right direction of the housing 1. The partition plates 2 partition the space within the housing 1 into a plurality of accommodation cavities 101 arranged at intervals along the left and right. Each accommodation cavity 101 has a bottom wall, a top wall, a left side wall, and a right side wall. The insulating coating layer 40 is Spray painting provided on the bottom wall, the top wall, the left side wall, and the right side wall of the accommodation cavity 101, and the insulating coating layer 40 within each accommodation cavity 101 Areais equal to the total area of the four wall surfaces of the bottom wall, top wall, left side wall, and right side wall of the accommodation cavity 101. The total inner wall area of each accommodation cavity 101, that is, the Area is in the range of 0.1 m 2 to 0.5 m 2 and may be within this range.

[0042] In this way, it is ensured that the insulating coating layer 40 is Spray painting applied to all the inner walls of the accommodation cavity 101, and the electrical insulation effect between the battery case 100 and the cell 500 can be ensured.

[0043] In some embodiments, the battery case 100 further includes mounting seats 3. There are two mounting seats 3, and the two mounting seats 3 are respectively provided on both sides in the width direction of the housing 1 and are symmetrically arranged with respect to the width direction of the housing 1. Further, the mounting seats 3 extend outward away from the housing 1 along the width direction of the housing 1 and extend in a strip shape along the length direction of the housing 1. Mounting holes 31 penetrating the mounting seats 3 are formed in the mounting seats 3 along the height direction of the housing 1 (for example, the up and down direction shown in FIG. 1). The number of mounting holes 31 in each mounting seat 3 is plural, and the plural mounting holes 31 are arranged at intervals in the length direction of the housing 1 (for example, the front and back direction shown in FIG. 1).

[0044] The battery pack 1000 according to the embodiment of the second aspect of the present application includes the battery case 100 according to the embodiment of the first aspect of the present application and a cell 500 provided in the accommodation cavity 101. Preferably, the cell 500 may be an aluminum housing cell, a pouch cell, or a cylindrical cell.

[0045] Other configurations and operations of the battery pack 1000 according to the embodiments of the present application are known to those skilled in the art and will not be described in detail here.

[0046] By providing the battery case 100 of the embodiment of the present application, which is the battery case 100 of the embodiment of the first aspect, the insulation effect between the battery case 100 and the cell 500 can be improved, the risk of insulation failure can be reduced, and the cells 500 in different accommodation cavities 101 can be separated from each other, so that the safety performance of the battery pack 1000 can be improved, and thus the overall performance of the battery pack 1000 can be improved.

[0047] For example, the battery pack 1000 may include a battery case 100 and pouch cells. The battery case 100 has a plurality of accommodation cavities 101 therein. The pouch cells are formed into a plurality of groups, and each group of cells 500 includes a plurality of connected cells 500. The plurality of groups of pouch cells may correspond one-to-one with the plurality of accommodation cavities 101, and each group of pouch cells may be provided in the corresponding accommodation cavity 101. The number of groups of pouch cells may be greater than the number of accommodation cavities 101. At this time, one or more groups of pouch cells may be provided in one accommodation cavity 101. Preferably, the number of groups of pouch cells in each accommodation cavity 101 is 2 or less.

[0048] In some embodiments of the present application, the cell 500 is a pouch cell, and a plurality of pouch cells are provided in the accommodation cavity. The plurality of pouch cells in the accommodation cavity are arranged along the first direction (for example, the front-rear direction shown in FIG. 1) and are directly connected. For example, the plurality of pouch cells in the accommodation cavity may be directly connected in sequence along the length direction of the accommodation cavity.

[0049] Furthermore, the battery pack 1000 may further include an insulating film 600 coated on the outside of the plurality of pouch cells, that is, the insulating film 600 may be coated on the outside of the plurality of pouch cells. For example, the insulating film 600 may be a PET insulating film 600, and the insulating film 600 may be adhered to the plurality of pouch cells by a pressure-sensitive adhesive. By coating the insulating film 600 on the outside of the pouch cells, the insulating film 600 not only temporarily fixes the pouch cell group and facilitates the incorporation of the pouch cell group into the accommodation cavity 101 of the battery case 100, but also the insulating film 600 and the insulating coating layer 40 form a two-layer insulating structure between the pouch cell group and the metal frame 10 of the battery case 100, and the insulating effect between the pouch cells and the metal frame 10 of the battery case 100 can be improved.

[0050] In some embodiments of the present application, the insulating film 600 coated on the outside of the pouch cell group and the insulating coating layer 40 on the inner surface of the accommodation cavity 101 are adhesively connected. For example, an adhesive layer is applied to the outer surface of the insulating film 600 and / or the insulating coating layer 40 on the inner surface of the accommodation cavity. When the pouch cell group is incorporated into the accommodation cavity, the insulating film 600 and the insulating coating layer 40 are adhered by the adhesive layer. Here, the insulating coating layer 40 is provided on the inner surface of the accommodation cavity 101, and the adhesion force between the insulating coating layer 40 material and the metal frame 10 (for example, an aluminum alloy frame) of the battery case 100 is very high, and the insulating coating layer 40 material has a high surface tension and can be wetted well by the adhesive of the adhesive layer to obtain a high adhesive strength. Therefore, it is advantageous for the adhesive connection between the insulating coating layer 40 and the insulating film 600, and the fixing effect of the structure of the cell 500 can be improved.

[0051] Hereinafter, with reference to FIGS. 1 to 4, the battery pack 1000 according to specific embodiments of the present application will be described.

[0052] As shown in FIGS. 1 to 4, the battery pack 1000 includes a battery case 100 and a plurality of cells 500 provided in the battery case 100.

[0053] Specifically, the battery case 100 includes a metal frame 10 and an insulating coating layer 40. The metal frame 10 is made of an integrally formed all-aluminum material. The housing 1 of the metal frame 10 is formed in a rectangular parallelepiped hollow structure. The front side and the rear side of the housing 1 are open. A plurality of partition plates 2 are provided inside the housing 1. The partition plates 2 extend along the front-rear direction and partition the space inside the housing 1 into a plurality of accommodation cavities 101 arranged at intervals left and right. The accommodation cavities 101 accommodate pouch cells.

[0054] The length of the housing 1 in the front-rear direction is in the range of 1.5 m to 2 m, the width of the housing 1 in the left-right direction is in the range of 1 m to 1.5 m, the height of the housing 1 in the up-down direction is in the range of 0.1 m to 0.15 m, the width of each accommodation cavity 101 in the left-right direction is in the range of 0.01 m to 0.05 m, and the height of the accommodation cavity 101 in the up-down direction is in the range of 0.1 m to 0.13 m.

[0055] Insulating coating layers 40 are provided or coated on all four surfaces of the accommodation cavity 101. The pouch cell and the aluminum housing 1 are insulated by the insulating coating layer 40. The thickness of the insulating coating layer 40 needs to satisfy a certain thickness value. The thickness of the insulating coating layer 40 may be calculated according to the formula I = V * A / (ρ * D), where V is the test voltage with the unit of v, ρ is the volume resistivity of the insulating layer with the unit of Ω·m, D is the Spray painting of the insulating layer with the unit of m, and A is the Thickness of the insulating layer with the unit of m Total area and I is the test current with the unit of A. Generally, it is necessary to satisfy I < 1 mA and V = 3000 v. The 2 of the insulating coating layer 40 of a single accommodation cavity 101 is 0.1 m Area to 0.5 m 2 and the 2 of the insulating coating layer 40 is 0.05 mm to 0.3 mm. Thickness

[0056] ​The plurality of cells 500 may be formed into a plurality of cell groups. Each cell group includes a plurality of cells 500. The plurality of cells 500 in each cell group are arranged in a first direction (for example, the front-rear direction shown in FIG. 1) and may be connected in series. One or two cell groups may be provided in one accommodation cavity 101. When the cell group is fixed inside the accommodation cavity 101 by adhesion, the insulating coating layer 40 may be disposed on the inner surface of the housing 1 Spray painting and the adhesion force between the coating layer material and the metal frame 10 is very high. The cell group is adhesively connected to the insulating coating layer 40 on the inner surface of the accommodation cavity by an adhesive layer. The coating layer material has a high surface tension, can be wetted well by the adhesive, and can obtain a high adhesive strength. Therefore, the adhesion effect between the pouch cell group and the insulating coating layer 40 can be improved, and the fixing effect of the structure of the pouch cell group can be improved.

[0057] Furthermore, the insulating coating layer 40 is mainly a polyurethane coating layer material. The polyurethane coating layer has a low elastic modulus and a breaking elongation > 100%. When the cell group is adhered to the inner surface of the accommodation cavity, the cell group is subjected to a torsional moment along the length direction of the cell group in addition to shear stress and tensile stress in the accommodation cavity. At this time, the moment arm is the length of the cell group, and stress concentration is likely to occur and cause damage. The polyurethane coating layer material of this embodiment can play a role in buffering, shock absorption, and stress concentration elimination.

[0058] In the battery pack 1000 according to the embodiment of the present application, an insulating coating layer 40 is Spray painting disposed on the inner surface of the accommodation cavity 101 of the battery case 100. Such a coating layer material can effectively cover the inner surface of the aluminum material mold cavity, increase the creepage distance between the pouch cell and the aluminum material, and reduce the risk of insulation failure.

[0059] The vehicle 10000 according to the embodiment of the third aspect of the present application includes the battery pack 1000 according to the embodiment of the second aspect of the present application.

[0060] Other configurations and operations of the vehicle 10000 according to the embodiments of the present application are known to those skilled in the art and will not be described in detail here.

[0061] By providing the battery pack 1000 of the embodiment of the second aspect, the vehicle 10000 according to the embodiment of the present application can improve the insulation effect between the battery case 100 and the cell 500, reduce the risk of insulation failure, and improve the safety performance of the vehicle 10000.

[0062] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description of the present application and simplifying the description, and does not indicate or imply that the indicated device or component must have a specific orientation and be configured and operate in a specific orientation, so it should not be understood as limiting the present application.

[0063] Also, the terms "first" and "second" are only for the purpose of explanation and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Thus, the features limited by "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise clearly and specifically limited.

[0064] In this application, unless otherwise clearly specified and limited, terms such as "mounting", "connecting", "attaching", "fixing", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection, and may be a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, a communication inside two components, or a relationship of interaction between two components. A person skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0065] In the description of this specification, descriptions referring to terms such as "one embodiment", "several embodiments", "example", "specific example", or "several examples" mean that the specific features, structures, materials, or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the exemplary expressions of the above terms do not necessarily mean the same embodiment or example. Also, the described specific features, structures, materials, or characteristics can be appropriately combined in any one or more embodiments or examples. Also, if there is no contradiction, a person skilled in the art can combine and combine different embodiments or examples described in this specification, and the features of different embodiments or examples.

[0066] Although the embodiments of this application have been shown and described, a person skilled in the art can make various changes, corrections, substitutions, and deformations to these embodiments without departing from the principle and purpose of this application, and understand that the scope of this application is limited by the scope of the claims and their equivalents.

Description of Reference Signs

[0067] 100 Battery case 101 Accommodation cavity 10 Metal frame 1 Housing 2 Partition plate 3 Mounting seat 31 Mounting hole 40 Insulation coating layer 500 Cell 600 Insulating film 1000 Battery pack 10000 Vehicle

Claims

1. A metal frame (10) having a plurality of accommodation cavities (101) for accommodating cells (500) is included. The plurality of accommodation cavities (101) are arranged at intervals, and an insulating coating layer (40) is provided on the inner surface of the accommodation cavity (101). The thickness D of the insulating coating layer (40) satisfies the following formula: 【Number 1】 Wherein, V is the test voltage, with the unit of volts, and the test voltage V is 3000 volts or more; I is the test current, with the unit of amperes, and the test current I is less than 1 milliampere; p is the volume resistivity of the insulation coating layer (40), with the unit of Ω·m; D is the thickness of the insulation coating layer (40), with the unit of m; A is the total area of the insulation coating layer (40), with the unit of m ２ and The metal frame (10) includes a housing (1) and a plurality of partition plates (2). At least one end of the housing (1) in the first direction is open. The plurality of partition plates (2) are provided in the housing (1), extend along the first direction, and are arranged at intervals in a second direction perpendicular to the first direction, partitioning the internal space of the housing (1) into a plurality of the accommodation cavities (101). Each accommodation cavity (101) has a bottom wall, a top wall, a first side wall and a second side wall formed by two partition plates (2) facing each other inside the accommodation cavity (101). The insulating coating layer (40) is spray-coated on the bottom wall, the top wall, the first side wall and the second side wall of each accommodation cavity (101). The area of the insulating coating layer (40) in each accommodation cavity (101) is equal to the total area of the four wall surfaces of the bottom wall, the top wall, the first side wall and the second side wall of the accommodation cavity (101). A battery case characterized by this.

2. The elongation at break of the insulating coating layer (40) is greater than 100%. The battery case according to claim 1, characterized by this.

3. The thickness of the insulating coating layer (40) is 0.05 mm to 0.3 mm. The battery case according to claim 1, characterized by this.

4. The insulating coating layer (40) is a polyurethane coating layer. The battery case according to claim 1, characterized by this.

5. The height of each accommodation cavity (101) is 0.1 m to 0.13 m. The battery case according to claim 1, characterized by this.

6. The area of the insulating coating layer (40) within each of the accommodating cavities (101) is 0.1 m ２ to 0.5 m ２ The battery case according to claim 1, characterized in that it is so.

7. A battery pack, comprising: the battery case (100) according to any one of claims 1 to 6; and a cell (500) provided in the accommodation cavity (101).

8. The cell (500) is a pouch cell, a plurality of the pouch cells are provided in the accommodation cavity (101), the plurality of the pouch cells are arranged along a first direction and are directly connected, and the battery pack (1000) further includes an insulating film (600) covering the outside of the plurality of the pouch cells. The battery pack according to claim 7, characterized in that.

9. A vehicle, characterized in that it includes the battery pack (1000) according to claim 7.

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