Cover and shell of battery pack, battery pack and electric device

Abstract

This utility model discloses a cover and shell of a battery pack, a battery pack, and an electrical device. The cover of the battery pack includes a first main body and a second main body. The first main body has a through hole, and the second main body covers at least a portion of the through hole. The second main body has a first protrusion protruding from the first main body, defining a first chamber communicating with the through hole. The temperature resistance of the first main body is higher than that of the second main body. According to the embodiment of this utility model, by including a first main body and a second main body with different temperature resistances, the first main body ensures that the cover has good strength and temperature resistance, while the second main body provides good formability, thereby improving the thermal safety performance of the battery pack and enabling the formation of protrusions with higher heights or more complex structures on the cover.

Description

Technical Field

[0001] This utility model relates to the field of battery casing technology, specifically to a cover and casing of a battery pack, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, the cover of the battery pack is made of PP blister material. When the battery pack experiences thermal runaway, the blister material cover is easily burned through when exposed to flames, resulting in the batteries inside the battery pack being exposed and posing a risk of fire and explosion. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a cover for a battery pack, which includes a first main body and a second main body with different temperature resistance. The first main body ensures that the cover has good strength and temperature resistance, while the second main body enables the cover to have good forming ability, so as to improve the thermal safety performance of the battery pack and also form protrusions with higher height or more complex structure on the cover.

[0004] This utility model also proposes a housing for a battery pack having the aforementioned cover.

[0005] This utility model also proposes a battery pack having the aforementioned casing.

[0006] This utility model also proposes an electrical device having the aforementioned battery pack.

[0007] A cover for a battery pack according to a first aspect of the present invention includes: a first body and a second body, the first body having a through hole, the second body covering at least a portion of the through hole, the second body having a first protrusion protruding from the first body, the first protrusion defining a first chamber communicating with the through hole, and the temperature resistance of the first body being higher than that of the second body.

[0008] According to the embodiments of the present invention, the cover of the battery pack includes a first main body and a second main body with different temperature resistance. The first main body ensures that the cover has good strength and temperature resistance, while the second main body enables the cover to have good molding ability. This improves the thermal safety performance of the battery pack and also allows for the formation of protrusions with higher height or more complex structures on the cover.

[0009] In addition, the cover of the battery pack according to the above embodiments of the present invention may also have the following additional technical features: According to some embodiments of the present invention, in the thickness direction of the first body, a portion of the second body overlaps with a portion of the first body and is fixedly connected to define the overlapping portion.

[0010] According to some optional embodiments of the present invention, the overlapping portion is formed as an annular ring surrounding the through hole; and / or, in any direction, the overlap length of the overlapping portion is L, where 30mm≤L; and / or, in any direction, the edge of the second body is located inside the edge of the first body.

[0011] According to some embodiments of the present invention, the second body and the first body are welded connectors.

[0012] According to some embodiments of the present invention, the first body is a thermoplastic composite material part, and the second body is a plastic part.

[0013] According to some optional embodiments of the present invention, the first body is a continuous fiber reinforced thermoplastic composite material part.

[0014] According to some optional embodiments of the present invention, the density of the first body is ρ = 1.45 g / cm³. 3 -1.6g / cm 3 ; and / or, the thickness d of the first body is 1.4mm-2.0mm.

[0015] According to some embodiments of the present invention, the first body defines a receiving cavity recessed toward the first protrusion, and the first chamber communicates with the receiving cavity.

[0016] According to some optional embodiments of the present invention, the receiving cavity has a centerline extending along a first direction and passing through the middle of the second direction of the receiving cavity. In a third direction, the projection of the first protrusion and the projection of the centerline at least partially coincide, and the first direction, the second direction and the third direction are perpendicular to each other.

[0017] According to some optional embodiments of the present invention, the first chamber has a first sidewall in a first direction, the receiving cavity has a second sidewall in a first direction, the first sidewall and the second sidewall are flush, wherein the first sidewall is provided with a mating opening.

[0018] According to some embodiments of the present invention, the first body has a second protrusion that defines a second chamber, wherein the second chamber communicates with the first chamber, and / or, in the thickness direction of the first body, the protrusion height of the second protrusion is less than the protrusion height of the first protrusion.

[0019] According to some optional embodiments of the present invention, the first body is provided with a third protrusion that protrudes in the direction of the first protrusion, wherein the third protrusion intersects with the second protrusion, and / or, in the thickness direction of the first body, the protrusion height of the third protrusion is less than the protrusion height of the first protrusion.

[0020] According to a second aspect of the present invention, a battery pack housing is provided, the battery pack housing including a cover body of the battery pack according to a first aspect of the present invention; a tray, the tray cooperating with the cover body to define a placement cavity, the first cavity communicating with the placement cavity.

[0021] According to the embodiments of the present invention, the cover of the battery pack described in the first aspect of the present invention is used to make the cover include a first main body and a second main body with different temperature resistance. The first main body can ensure that the cover has good strength and temperature resistance, and the second main body can make the cover have good molding ability, which facilitates the improvement of the overall strength and thermal safety performance of the housing.

[0022] According to a third aspect of the present invention, a battery pack is provided, the battery pack comprising: a battery assembly and a power distribution module, the battery assembly comprising a plurality of battery cells; according to a second aspect of the present invention, the housing comprising the plurality of battery cells arranged in the placement cavity, the power distribution module being located in the first cavity.

[0023] According to the embodiments of the present invention, the battery pack utilizes the shell described in the second aspect of the present invention, so that the cover includes a first main body and a second main body with different temperature resistance. The first main body ensures that the cover has good strength and temperature resistance, and the second main body enables the cover to have good molding ability, so as to improve the thermal safety performance of the battery pack and also form a protrusion with a higher height or a more complex structure on the cover.

[0024] According to a fourth aspect of the present invention, an electrical device is provided, the electrical device comprising a battery pack as described in an embodiment of a third aspect of the present invention.

[0025] According to the embodiments of the present invention, the electrical equipment utilizes the battery pack described in the third aspect of the present invention, so that the cover includes a first main body and a second main body with different temperature resistance. The first main body ensures that the cover has good strength and temperature resistance, and the second main body enables the cover to have good molding ability, so that the battery pack has good thermal safety performance and facilitates the improvement of the safety of drivers and passengers.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the cover of the battery pack according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the cover of the battery pack according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the first main substrate according to an embodiment of the present utility model when it is not hot-pressed; Figure 4 This is a schematic diagram of the structure of the first main substrate and the second main substrate according to an embodiment of the present utility model when they are not hot-pressed; Figure 5 yes Figure 4 Sectional view at point AA; Figure 6 yes Figure 5 Enlarged view of the central area; Figure 7 yes Figure 4 Sectional view at point BB; Figure 8 yes Figure 7 A magnified view of the central area.

[0028] Reference numerals: 1. Cover; 10. First main body; 11. Through hole; 121. Second side wall; 13. Second protrusion; 14. Third protrusion; 15. Fixed flange; 20. Second body; 21. First protrusion; 211. First chamber; 212. First sidewall; 213. Fitting opening; 30. Overlapping portion; M. Centerline. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] The cover 1 of the battery pack according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0031] like Figures 1-3As shown, the cover 1 of the battery pack according to an embodiment of the present invention includes a first body 10 and a second body 20.

[0032] The first body 10 has a through hole 11, and the second body 20 covers at least part of the through hole 11. The second body 20 has a first protrusion 21 protruding from the first body 10. The first protrusion 21 defines a first chamber 211 that communicates with the through hole 11. The temperature resistance of the first body 10 is higher than that of the second body 20. In this way, the first protrusion 21, which requires high material plasticity, can be formed on the cover 1 while ensuring the strength of the cover 1 itself and the temperature resistance of the cover 1.

[0033] In this embodiment of the present invention, the cover 1 includes two main bodies. The first main body 10 has better temperature resistance. Based on the characteristics of the first main body 10 itself, the cover 1 has better structural strength and high temperature resistance. On the one hand, the cover 1 can better protect the components in the battery pack. On the other hand, when the battery pack experiences thermal runaway, the high temperature resistant cover 1 can effectively block the spread of flames in the battery pack. Moreover, the cover 1 can maintain its original shape at high temperatures, which can reduce the exposed area of ​​the battery in the battery pack and improve the thermal safety of the battery pack.

[0034] The second body 20 has low temperature resistance, but by utilizing the good plasticity and thermoplasticity of the second body 20, it is possible to form a more complex or material-plasticity-required protrusion on the cover 1, such as the first protrusion 21. The first chamber 211 defined by the first protrusion 21 can be used to place the power distribution module of the battery pack, which makes it easier to reserve space for the power distribution module in the cover 1 and improve the utilization rate of the space inside the battery pack.

[0035] Specifically, if a high-height protrusion is formed on the first body 10 with high temperature resistance, the material of the first body 10 is easily broken, which makes the formation of protrusions on the first body 10 quite limited. However, the present invention provides a second body 20 with lower temperature resistance on the first body 10. Based on the high plasticity and thermoplasticity of the second body 20, it is possible to form a high-height or structurally complex protrusion on the cover 1, such as the first protrusion 21. This ensures that the cover 1 has good strength and temperature resistance while also allowing the formation of a high-height or structurally complex protrusion on the cover 1.

[0036] It is important to understand here that the base material of the first body 10 and the second body 20 is a sheet metal component. The cover 1 is formed by hot pressing the sheet metal component. When hot pressing the first body 10 and the second body 20 to form the cover 1, the mold is adapted to cooperate with the second body 20 through the through hole 11, thereby hot pressing a first protrusion 21 protruding from the first body 10 onto the second body 20. Specifically, the through hole 11 is provided so that the mold avoids the first body 10, so as to prevent the first body 10 from breaking due to large tensile force when the first protrusion 21 is formed on the second body 20.

[0037] It should also be explained that temperature resistance represents a material's ability to resist heat, and is not a single indicator. The temperature resistance described in this invention includes the material's resistance to deformation at high temperatures, that is, how high a temperature the material can withstand in a short period without softening or deforming. The higher the temperature the material can withstand, the better its resistance to deformation at high temperatures, and the better its temperature resistance. Specifically, its temperature resistance can be determined by measuring the heat distortion temperature (HDT) of the first body 10 and the second body 20; the higher the HDT, the better its temperature resistance.

[0038] Taking the first body 10 as a thermoplastic composite material and the second body 20 as a plastic part as an example, by measuring the thermal stability of the first body 10 and the second body 20, the temperature resistance of the first body 10 and the second body 20 can be determined.

[0039] Take thermoplastic composite parts and plastic parts with the same thickness, length, and width. Place the thermoplastic composite parts and plastic parts in a silicone oil bath and apply bending stress to the materials. The bending stress can be 1.80 MPa, 0.45 MPa, or 8.00 MPa. The initial temperature should be at least 50°C lower than the expected heat distortion temperature. Increase the temperature at a uniform rate of 120°C / h ± 10°C / h and monitor the deflection change of the samples. When the deflection of the sample reaches the specified maximum value, record the temperature of the silicone oil at this time. The specified maximum deflection value is usually 0.34 mm or 0.32 mm, depending on the officially published technical documents that detail the test method and the mechanical dimensions of the test equipment.

[0040] When the bending stress is 1.80 MPa and the measured heat distortion temperature (HDT) of the sample is 120°C, the HDT of the sample can be labeled as HDT@1.8MPa=120°C. The HDTs measured at other bending stresses are also labeled in the same way.

[0041] This allows for the measurement of multiple thermoplastic composite material samples and plastic sample samples, with the median of multiple heat distortion temperatures used to determine the heat distortion temperature (HDT).

[0042] According to the embodiment of the present utility model, the cover 1 of the battery pack includes a first main body 10 and a second main body 20 with different temperature resistance. The first main body 10 ensures that the cover 1 has good strength and temperature resistance, and the second main body 20 enables the cover 1 to have good molding ability. This improves the thermal safety performance of the battery pack and also allows for the formation of protrusions with higher height or more complex structure on the cover 1.

[0043] The cover 1 of the battery pack according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0044] In some specific embodiments of this utility model, such as Figures 1-3 As shown, the cover 1 includes a first body 10 and a second body 20.

[0045] In some embodiments of this utility model, such as Figures 5-8 As shown, in the thickness direction of the first body 10, a portion of the second body 20 overlaps with a portion of the first body 10 and is fixedly connected to define the overlapping portion 30, so as to connect the first body 10 and the second body 20 together to form an integral cover 1.

[0046] Specifically, Figures 5-8 This is a schematic diagram of the structure of the first body 10 and the second body 20 before hot pressing. The substrate of the second body 20 is supported on the first body 10, and the substrate portion of the second body 20 overlaps and connects with the substrate portion of the first body 10 to fix the substrate of the first body 10 and the substrate of the second body 20 together, so as to facilitate the thickness of the substrate of the first body 10 and the substrate of the second body 20 to be hot pressed together to form the cover 1.

[0047] It is understandable that the shape of the overlapping portion 30 after hot pressing will change depending on the shape of the mold.

[0048] In some optional embodiments of this utility model, the overlapping portion 30 is formed as an annular ring surrounding the through hole 11, so that when the portion of the first body 10 and the portion of the second body 20 are fixedly connected together, the sealing of the top cover can be guaranteed, and the stability of the connection between the first body 10 and the second body 20 can be guaranteed.

[0049] Specifically, the substrate of the second body 20 completely covers the through hole 11 on the substrate of the first body 10. The portion of the substrate of the second body 20 that extends beyond the through hole 11 overlaps with the substrate of the first body 10 and is fixedly connected to form an annular overlapping portion 30. In this way, after the substrate of the first body 10 and the substrate of the second body 20 are hot-pressed, the sealing at the connection between the first body 10 and the second body 20 can still be guaranteed, that is, the sealing at the overlapping portion 30 can be guaranteed.

[0050] It is understandable that after hot pressing the substrate of the first body 10 and the substrate of the second body 20 to form the cover 1, the shape of the through hole 11 may change, and the shape of the overlapping portion 30 may change with the shape of the through hole 11, but the overlapping portion 30 is still annular around the through hole 11.

[0051] Wherein, after the substrate of the first body 10 and the substrate of the second body 20 are hot-pressed to form the cover 1, protrusions may be formed on the first body 10 and the second body 20, and the overlapping portion 30 may become an annular shape with a height difference.

[0052] In some embodiments, such as Figure 3 , Figure 4 As shown, the through hole 11 on the substrate of the first main body 10 is square, the substrate of the second main body 20 is square, and the part of the second main body 20 that extends beyond the through hole overlaps with the substrate of the first main body 10 to form an overlapping part 30. The shape of the overlapping part 30 is a square ring.

[0053] In some embodiments, the through hole 11 on the substrate of the first body 10 is circular, the substrate of the second body 20 is a circular substrate, and the portion of the second body 20 that extends beyond the through hole overlaps with the substrate of the first body 10 to form an overlapping portion 30, the shape of the overlapping portion 30 being annular.

[0054] In some embodiments, the through hole 11 on the substrate of the first body 10 is square and the substrate of the second body 20 is circular; or the through hole 11 on the substrate of the first body 10 is circular and the substrate of the second body 20 is square, and the portion of the second body 20 that extends beyond the through hole overlaps with the substrate of the first body 10 to form an overlapping portion 30, and the overlapping portion 30 is an annulus with different widths in the circumferential direction.

[0055] In some optional embodiments of this utility model, such as Figure 6 , Figure 8 As shown, in any direction, the overlap length of the overlapping portion 30 is L, where 30mm≤L, so that the first body 10 and the second body 20 have a strong connection strength and prevent the second body 20 from falling off the first body 10.

[0056] Specifically, the substrate of the first body 10 has a through hole 11, and the portion of the substrate of the second body 20 that extends beyond the through hole 11 overlaps the substrate of the first body 10. In any direction, such as the first direction or the second direction, the length L of the second body 20 substrate extending beyond the through hole 11 and overlapping the substrate of the first body 10 is greater than or equal to 30mm. This ensures that when the portion of the second body 20 substrate extending beyond the through hole 11 is connected to the substrate of the first body 10, the first body 10 substrate and the second body 20 substrate have a large connection strength, preventing the second body 20 from falling off the first body 10.

[0057] In the process of hot pressing the first main body 10 substrate and the second main body 20 substrate, if the connection strength between the first main body 10 and the second main body 20 is insufficient, the overlapping portion 30 formed by the first main body 10 and the second main body 20 will easily separate when the first protrusion 21 is formed by hot pressing the second main body 20 substrate, causing the first main body 10 and the second main body 20 to detach. Therefore, the length L of the second main body 20 substrate extending beyond the through hole 11 and overlapping the first main body 10 substrate is greater than or equal to 30mm, so as to ensure the connection strength between the first main body 10 substrate and the second main body 20 substrate, and thus prevent the second main body 20 from falling off the first main body 10 when the hot pressing applies force to the first main body 10 substrate and the second main body 20 substrate.

[0058] Specifically, after hot pressing the substrate of the first body 10 and the substrate of the second body 20, the shape of the overlapping portion 30 may change, but in any direction, the overlap length of the overlapping portion 30 is still greater than or equal to 30 mm.

[0059] In some embodiments, the through hole 11 on the substrate of the first body 10 is square, the substrate of the second body 20 is square, and the overlapping portion 30 formed by the portion of the second body 20 extending beyond the through hole and overlapping with the substrate of the first body 10 is square annular. In any direction, the distance between the inner edge and the outer edge of the square annular is greater than or equal to 30 mm.

[0060] In some examples, such as Figure 5 , Figure 6 As shown, in the first direction, the length of the through hole 11 on the substrate of the first main body 10 is a1, the length of the substrate of the second main body 20 is a2, and the length L of the overlapping part 30 on both sides of the through hole 11 in the first direction is the same and both are greater than or equal to 30mm. At this time, L = (a2-a1) / 2.

[0061] In some examples, such as Figure 7 , Figure 8 As shown, in the second direction, the length of the through hole 11 on the substrate of the first body 10 is b1, the length of the substrate of the second body 20 is b2, and the length L of the overlapping portion 30 on both sides of the through hole 11 in the second direction is the same and greater than or equal to 30mm. At this time, L = (b2-b1) / 2.

[0062] In some embodiments, the through hole 11 on the substrate of the first body 10 is circular, the substrate of the second body 20 is circular, and the overlapping portion 30 formed by the portion of the second body 20 extending beyond the through hole and overlapping with the substrate of the first body 10 is annular in shape. In the radial direction of the annular shape, the distance between the inner edge and the outer edge of the annular shape is greater than or equal to 30 mm.

[0063] In some embodiments, the through hole 11 on the substrate of the first body 10 is square, and the substrate of the second body 20 is circular; or the through hole 11 on the substrate of the first body 10 is circular, the substrate of the second body 20 is square, and the overlapping portion 30 formed by the portion of the second body 20 extending beyond the through hole and overlapping with the substrate of the first body 10 is an annulus with different widths in the circumferential direction, and the minimum distance between the inner edge and the outer edge of the annulus is greater than or equal to 30 mm.

[0064] In some optional embodiments of this utility model, in any direction, the edge of the second body 20 is located inside the edge of the first body 10, so that the second body 20 does not exceed the first body 10. This makes it easier to reduce the size of the second body 20 in the cover 1, so that most of the area in the cover 1 is composed of the first body 10, so that the cover 1 has strong structural strength and temperature resistance.

[0065] It needs to be explained here that the inner side of the edge of the first body 10 refers to the side facing the center of the first body 10, and the edge of the second body 20 is located on the side of the edge of the first body 10 facing the center of the first body 10. It can be understood that the edge of the second body 20 does not exceed the edge of the first body 10.

[0066] In some embodiments, such as Figure 4 As shown, in the first direction, the minimum distance between the edge of the through hole 11 on the substrate of the first body 10 and the edge of the first body 10 is a0, L < a0, so that the edge of the second body 20 in the first direction does not exceed the edge of the first body 10 in the first direction.

[0067] In some embodiments, such as Figure 4 As shown, in the second direction, the minimum distance between the edge of the through hole 11 on the substrate of the first body 10 and the edge of the first body 10 is b0, L < b0, so that the edge of the second body 20 in the second direction does not exceed the edge of the first body 10 in the second direction.

[0068] Specifically, the through hole 11 on the substrate of the first body 10 is adapted to be formed by cutting the substrate, and the size of the through hole 11 is adapted to the size of the substrate of the second body 20, and the size of the second body 20 depends on the size of the first chamber 211.

[0069] In some embodiments of this utility model, the second body 20 and the first body 10 are welded connectors to stably connect the first body 10 and the second body 20 together, while also ensuring the sealing between the first body 10 and the second body 20.

[0070] It is understandable that when the first body 10 is a thermoplastic composite material and the second body 20 is a plastic part, the matrix of the thermoplastic composite material and the plastic part are made of the same material. For example, the first body 10 is a thermoplastic resin composite material and the second body 20 is a PP resin matrix composite material. By welding and heating the connection area of ​​the first body 10 and the second body 20, parts of the first body 10 and the second body 20 are melted and connected together.

[0071] In some embodiments, the substrate of the first body 10 and the substrate of the second body 20 are connected by spot welding to form a split composite plate. In this way, when the split composite plate is hot-pressed to form the cover 1, the connection strength between the first body 10 and the second body 20 can be guaranteed, and the second body 20 can be prevented from falling off the first body 10.

[0072] In other embodiments, the substrate of the first body 10 and the substrate of the second body 20 can also be fixed together by fasteners or adhesives, without further restrictions.

[0073] In some embodiments of this utility model, the first body 10 is a thermoplastic composite material part, and the second body 20 is a plastic part.

[0074] When the cover 1 is formed using a single thermoplastic composite material, due to the low elongation at break of the thermoplastic composite material, the thermoplastic composite material can only make some simple protrusions and cannot form complex or high protrusions.

[0075] When the cover 1 is formed from a single plastic part, although the plastic part has excellent formability, if the battery pack experiences thermal runaway, the plastic part will be burned through when exposed to flames, exposing the individual battery cells in the battery pack, and the battery pack will be at risk of fire and explosion.

[0076] In this embodiment, the main surface, side surface and flange surface of the cover 1 are made of thermoplastic composite material, and the material of the first convex area is made of plastic with high fluidity and high elongation, which can ensure that the cover 1 can be formed with a complex structure, while ensuring the thermal safety performance of the battery pack.

[0077] Specifically, when thermal runaway occurs in the battery pack, the plastic parts can absorb heat and temporarily slow down the rise in battery pack temperature. Afterward, the first body 10 can still maintain its shape to isolate the flame, maintain the integrity of the battery pack structure, and ensure the safety of the user.

[0078] In some embodiments, the second body 20 is a PP plastic part or a PP thermoplastic part.

[0079] In some embodiments, both the first body 10 and the second body 20 are insulating components to improve the safety of the battery pack and prevent battery pack leakage.

[0080] Furthermore, the matrix of the first body 10 is resin, and the first body 10 is a thermoplastic resin composite material, so that the first body 10 is an insulating part, thereby preventing battery pack leakage.

[0081] In some examples, the first body 10 is a short fiber reinforced thermoplastic composite part, a long fiber reinforced thermoplastic composite part, or a continuous fiber reinforced thermoplastic composite part.

[0082] Specifically, the first body 10 is a short fiber reinforced thermoplastic resin composite material part, a long fiber reinforced thermoplastic resin composite material part, or a continuous fiber reinforced thermoplastic resin composite material part.

[0083] Furthermore, the first body 10 is a continuous fiber reinforced thermoplastic composite material, so that the first body 10 has strong strength and temperature resistance, and thus, in the event of thermal runaway of the battery pack, the first body 10 can physically isolate the flame, maintain the integrity of the battery pack structure, and improve the safety of the battery pack.

[0084] In some examples, the first body 10 is a continuous fiber reinforced thermoplastic composite material, and the second body 20 is a PP resin matrix. After testing, the cover 1 meets the requirement that the entire pack does not catch fire after 30 minutes of thermal diffusion. The first body 10 can achieve a temperature insulation of over 600°C. Thus, when thermal diffusion occurs in the battery pack, the PP resin matrix melts and absorbs a large amount of heat, temporarily delaying the temperature rise. Afterward, the continuous fiber reinforced thermoplastic composite material can still maintain its shape to isolate the flame, maintain the integrity of the battery pack structure, and ensure the safety of the user.

[0085] In some examples, the density of the first body 10 is ρ = 1.45 g / cm³. 3 -1.6g / cm 3 Among them, the density ρ of the first body 10 is greater than or equal to 1.45 g / cm³. 3 This ensures the glass fiber content in the first body 10, giving the first body 10 strong temperature resistance, thereby enabling the first body 10 to stably isolate the flame and maintain the integrity of the battery pack structure in the event of thermal runaway.

[0086] The density of the first body 10 is made to be less than or equal to 1.6 g / cm³. 3 This allows the first body 10 to have a certain molding capability, thereby enabling the formation of a relatively simple protruding structure on the first body 10.

[0087] In some examples, the thickness d of the first body 10 is 1.4mm-2.0mm. The thickness d of the first body 10 is greater than or equal to 1.4mm to ensure that the substrate of the first body 10 has a sufficient number of laminate layers, so that the first body 10 has strong temperature resistance and can stably isolate the flame, so as to maintain the integrity of the battery pack structure in the event of thermal runaway of the battery pack.

[0088] The thickness d of the first body 10 is less than or equal to 2.0 mm to control the cost of the cover 1. At the same time, if the thickness of the first body 10 is too large, it will be difficult to form a protruding structure on the first body 10.

[0089] Specifically, the density ρ of the first body 10 is 1.45 g / cm³. 3 -1.6g / cm 3 The thickness d of the first body 10 is 1.4mm-2.0mm, which enables the first body 10 to have high heat insulation properties, ensuring that the heat insulation temperature of the first body 10 can reach above 600℃. At the same time, it can make the upper cover more cost-effective, so as to reduce the cost of the upper cover while ensuring performance.

[0090] In some specific embodiments of this utility model, the first body 10 is a thermoplastic composite material part, the second body 20 is a plastic part, the substrate of the first body 10 and the substrate of the second body 20 are both sheet metal parts, and the manufacturing steps of the cover 1 are described in detail below.

[0091] First, the substrate of the first main body 10 is cut to form a through hole. The size of the through hole is adapted to the size of the power distribution module. Specifically, the through hole is either in the positive direction or circular. In the first direction, the minimum dimension between the edge of the through hole and the edge of the substrate of the first main body 10 is a0. In the second direction, the minimum dimension between the edge of the through hole and the edge of the substrate of the first main body 10 is b0.

[0092] Then the plastic part is cut to form a second body 20 substrate of a preset size. The second body 20 substrate can be a circular plate or a square plate. In the first direction, the size of the second body 20 substrate is a1.

[0093] The cut second body 20 substrate is placed on the substrate of the first body 10, and the second body 20 completely covers the through hole on the substrate of the first body 10. In the second direction, the size of the second body 20 substrate is b1. In any direction, the edge of the second body 20 does not exceed the edge of the first body 10. In any direction, the size of the second body 20 substrate overlapping the substrate of the first body 10 substrate is L, where L is greater than or equal to 30mm.

[0094] When the length L of the overlapping portion 30 on both sides of the through hole 11 in the first direction is the same, the length L of the overlapping portion 30 on both sides of the through hole 11 in the first direction satisfies: 30mm≤L=(a2-a1) / 2≤a0. When the length L of the overlapping portion 30 on both sides of the through hole 11 in the second direction is the same, the length L of the overlapping portion 30 on both sides of the through hole 11 in the second direction satisfies: 30mm≤L=(b2- b1) / 2≤b0.

[0095] The first main body 10 substrate and the second main body 20 substrate are spot welded together to form a split-type composite plate.

[0096] Fix the modular sheet material onto the tooling fixture, bake it in an oven at 250℃ for 5 minutes, and then quickly transfer it to a molding press of 1000T or more for molding. The transfer time should be less than 15 seconds to avoid problems such as insufficient glue or fiber leakage in the molded product due to long transfer time and rapid material cooling. Hold the pressure for 60 seconds. After the resin flow and filling of the mold are completed, take it out and machine it as required to obtain the final cover 1 finished product.

[0097] In some embodiments of the present invention, the first body 10 defines a receiving cavity recessed toward the first protrusion 21, the first chamber 211 communicates with the receiving cavity, and the receiving cavity is adapted to receive at least a portion of the battery cells in the battery pack.

[0098] Specifically, the first body 10 defines the receiving cavity so that the entire large surface, side surface and flange surface of the cover 1 are all high-strength and high-temperature resistant first body 10, thus ensuring the thermal safety performance of the battery pack.

[0099] In some optional embodiments of this utility model, such as Figure 1 As shown, the receiving cavity has a center line M extending along a first direction and passing through the middle of the second direction of the receiving cavity. In the third direction, the projection of the first protrusion 21 and the projection of the center line M at least partially coincide, and the first direction, the second direction and the third direction are perpendicular to each other.

[0100] Specifically, the projection of the first protrusion 21 in the third direction and the projection of the center line M in the third direction are at least partially coincided, so that the first protrusion 21 is set close to the middle of the receiving cavity. This can reduce the possibility of the first protrusion 21 being impacted by the outside, and the first protrusion 21 set in the middle of the receiving cavity can play a role in improving the overall strength of the cover 1.

[0101] In some optional embodiments of this utility model, such as Figure 2As shown, the first chamber 211 has a first sidewall 212 in the first direction, and the receiving cavity has a second sidewall 121 in the first direction. The first sidewall 212 and the second sidewall 121 are flush, which facilitates the cooperation between the first protrusion 21 and the electrical equipment.

[0102] Specifically, when the battery pack is installed into the electrical device, the electrical device has a mating cavity that mates with the first protrusion 21. The first protrusion 21 is adapted to extend into the mating cavity, and the first sidewall 212 of the first protrusion 21 is flush with the second sidewall 121 of the receiving cavity. In this way, when the battery pack is installed into the electrical device, it is convenient to position the first protrusion 21 from the second sidewall 121 to accurately install the first protrusion 21 into the receiving cavity, thereby concealing the position of the first protrusion 21 in the electrical device.

[0103] In some specific embodiments of this utility model, such as Figure 2 As shown, a mating port 213 is provided on the first side wall 212, wherein the power distribution module of the battery pack is located in the first chamber 211, and the power distribution module is adapted to achieve electrical connection with external components through the mating port 213.

[0104] Since the first sidewall 212 and the second sidewall 121 of the receiving cavity are flush, it is convenient for the operator to insert the battery into the first chamber 211 through the mating port 213, thereby realizing the electrical connection between the wire and the power distribution module in the first chamber 211. The power distribution module is suitable for electrical connection with external components by using wires.

[0105] In some embodiments of this utility model, such as Figure 1 , Figure 2 As shown, the first body 10 has a second protrusion 13, which defines a second chamber. The second chamber is connected to the first chamber 211. The second chamber is adapted to accommodate a high-voltage copper busbar in the battery pack. The high-voltage copper busbar connects the power distribution module in the first chamber 211 and the battery cells of the battery pack.

[0106] The second protrusion 13 is formed by the first main body 10, which makes the entire large surface of the cover 1 the first main body 10, so as to ensure the thermal safety performance of the battery pack.

[0107] In some embodiments, the second protrusion 13 is formed in the first body 10 by means of hot pressing, stamping or the like.

[0108] In some optional embodiments of this utility model, such as Figure 1As shown, in the thickness direction of the first body 10, the protrusion height of the second protrusion 13 is less than the protrusion height of the first protrusion 21, so as to utilize the limited molding capacity of the first body 10 to form the second protrusion 13, and to avoid the material of the first body 10 being torn when the second protrusion 13 is formed on the first body 10, and to avoid the fibers in the first body 10 being torn.

[0109] In some specific embodiments of this utility model, such as Figure 1 As shown, the first body 10 is provided with a third protrusion 14 that protrudes in the direction of the first protrusion 21. The third protrusion 14 is intersected with the second protrusion 13. The provision of the third protrusion 14 can enhance the overall strength of the cover 1, so as to better protect the components in the battery pack.

[0110] The third protrusion 14 is formed by the first main body 10, which makes the entire large surface of the cover 1 the first main body 10, so as to ensure the thermal safety performance of the battery pack.

[0111] In some embodiments, a second protrusion 13 and a third protrusion 14 are formed on the first body 10 by means of hot pressing, stamping or the like. The second chamber defined by the second protrusion 13 accommodates the high-voltage copper busbar in the battery pack. By forming the third protrusion 14 on the first body 10, the overall strength of the first body 10 can be enhanced, thereby enhancing the overall strength of the battery pack.

[0112] In some embodiments, in the thickness direction of the first body 10, the protrusion height of the third protrusion 14 is less than the protrusion height of the first protrusion 21, so as to utilize the limited molding capacity of the first body 10 to form the third protrusion 14, and to avoid the material of the first body 10 being torn when the third protrusion 14 is formed on the first body 10, and to avoid the fibers in the first body 10 being torn.

[0113] In some embodiments of this utility model, such as Figure 1 As shown, the cover 1 has a fixed flange 15 arranged around the receiving cavity, and the first body 10 defines the fixed flange 15, which is adapted to be fixedly connected to the tray of the battery pack.

[0114] Furthermore, the battery pack tray has a connecting flange, and the fixing flange 15 fits into the connecting flange. The fixing flange 15 and the connecting flange are suitable for being fixed together by welding or fasteners to fix the cover 1 and the tray together, so as to protect the components in the battery pack together with the cover 1 and the tray.

[0115] The following describes the housing of a battery pack according to an embodiment of the present invention. The housing of the battery pack according to an embodiment of the present invention includes a cover 1 and a tray according to the above embodiment of the present invention.

[0116] The tray and the cover 1 cooperate to define the placement cavity, and the first chamber 211 is connected to the placement cavity.

[0117] The placement cavity is suitable for housing the battery components of the battery pack, and the first chamber 211 is suitable for housing the power distribution module. The battery components are electrically connected to the power distribution module, and the first chamber 211 is connected to the placement cavity to facilitate the electrical connection between the power distribution module and the battery components. Specifically, the power distribution module is used to distribute the transmission of high-voltage current in the battery pack, provide safety protection for the battery pack, and monitor the system.

[0118] According to the embodiment of the present invention, the cover 1 of the battery pack according to the above embodiment of the present invention is used to make the cover 1 include a first main body 10 and a second main body 20 with different temperature resistance. The first main body 10 can ensure that the cover 1 has good strength and temperature resistance, and the second main body 20 can make the cover 1 have good molding ability, which is convenient to improve the overall strength and thermal safety performance of the shell.

[0119] Other configurations and operations of the battery pack housing according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0120] The following describes a battery pack according to an embodiment of the present invention. The battery pack according to an embodiment of the present invention includes a battery assembly, a power distribution module, and a housing according to the above embodiment of the present invention.

[0121] The battery pack comprises multiple battery cells arranged within a placement cavity. A power distribution module is located within a first chamber 211. The battery pack is electrically connected to the power distribution module, enabling communication between the first chamber 211 and the placement cavity for convenient electrical connection. Specifically, the power distribution module is used to distribute the transmission of high-voltage current in the battery pack, providing safety protection and system monitoring for the battery pack.

[0122] According to the battery pack of the present invention, by utilizing the shell of the above embodiment of the present invention, the cover 1 includes a first main body 10 and a second main body 20 with different temperature resistance. The first main body 10 can ensure that the cover 1 has good strength and temperature resistance, and the second main body 20 can make the cover 1 have good molding ability, so as to improve the thermal safety performance of the battery pack and also form a protrusion with a higher height or a more complex structure on the cover 1.

[0123] Other configurations and operations of the battery pack according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0124] The following describes an electrical device according to an embodiment of the present invention. The electrical device according to an embodiment of the present invention includes a battery pack according to the above-described embodiment of the present invention.

[0125] According to the embodiments of the present invention, the electrical equipment utilizes the battery pack according to the above embodiments of the present invention, so that the cover 1 includes a first main body 10 and a second main body 20 with different temperature resistance. The arrangement of the first main body 10 can ensure that the cover 1 has good strength and temperature resistance, and the arrangement of the second main body 20 can make the cover 1 have good molding ability, so that the battery pack has good thermal safety performance and can improve the safety of drivers and passengers.

[0126] The electrical equipment mentioned here can include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0127] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0128] In some embodiments, the electrical equipment is a vehicle, which may be a pure electric vehicle or a hybrid vehicle.

[0129] Other components and operations of the electrical equipment according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0130] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0131] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0132] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0133] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0134] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover for a battery pack, characterized in that, include A first body (10) and a second body (20), the first body (10) having a through hole (11), the second body (20) covering at least part of the through hole (11), the second body (20) having a first protrusion (21) protruding from the first body (10), the first protrusion (21) defining a first chamber (211) communicating with the through hole (11), the temperature resistance of the first body (10) being higher than that of the second body (20).

2. The cover of the battery pack according to claim 1, characterized in that, In the thickness direction of the first body (10), a portion of the second body (20) overlaps with and is fixedly connected to a portion of the first body (10) to define the overlapping portion (30).

3. The cover of the battery pack according to claim 2, characterized in that, The overlapping portion (30) is formed as an annular ring surrounding the through hole (11); And / or, in any direction, the overlap length of the overlapping portion (30) is L, where 30mm≤L; And / or, in any direction, the edge of the second body (20) is located inside the edge of the first body (10).

4. The cover of the battery pack according to claim 1, characterized in that, The second body (20) and the first body (10) are welded connectors.

5. The cover of the battery pack according to claim 1, characterized in that, The first body (10) is a thermoplastic composite material part, and the second body (20) is a plastic part.

6. The cover of the battery pack according to claim 5, characterized in that, The first body (10) is a continuous fiber reinforced thermoplastic composite material part.

7. The cover of the battery pack according to claim 5, characterized in that, The density of the first body (10) is ρ = 1.45 g / cm³. 3 -1.6g / cm 3 ; And / or, the thickness d of the first body (10) is 1.4mm-2.0mm.

8. The cover of the battery pack according to claim 1, characterized in that, The first body (10) defines a receiving cavity recessed toward the first protrusion (21), and the first chamber (211) communicates with the receiving cavity.

9. The cover of the battery pack according to claim 8, characterized in that, The receiving cavity has a centerline (M) extending along a first direction and passing through the middle of the second direction of the receiving cavity. In a third direction, at least part of the projection of the first protrusion (21) and the projection of the centerline (M) coincide. The first direction, the second direction and the third direction are perpendicular to each other.

10. The cover of the battery pack according to claim 8, characterized in that, The first chamber (211) has a first sidewall (212) in a first direction, and the receiving cavity has a second sidewall (121) in a first direction. The first sidewall (212) is flush with the second sidewall (121), wherein the first sidewall (212) is provided with a mating opening (213).

11. The cover of the battery pack according to any one of claims 1-10, characterized in that, The first body (10) has a second protrusion (13) that defines a second chamber. The second chamber is connected to the first chamber (211), and / or, in the thickness direction of the first body (10), the protrusion height of the second protrusion (13) is less than the protrusion height of the first protrusion (21).

12. The cover of the battery pack according to claim 11, characterized in that, The first body (10) is provided with a third protrusion (14) that protrudes toward the first protrusion (21). The third protrusion (14) is intersecting with the second protrusion (13), and / or, in the thickness direction of the first body (10), the protrusion height of the third protrusion (14) is less than the protrusion height of the first protrusion (21).

13. A battery pack casing, characterized in that, include: Cover (1), the cover (1) being the cover (1) according to any one of claims 1-12; The tray, which cooperates with the cover (1) to define a placement cavity, and the first chamber (211) communicates with the placement cavity.

14. A battery pack, characterized in that, include: Battery assembly and power distribution module, wherein the battery assembly includes multiple battery cells; The housing is the housing as described in claim 13, with a plurality of battery cells arranged in the placement cavity, and the power distribution module located in the first chamber (211).

15. An electrical appliance, characterized in that, Includes the battery pack as described in claim 14.

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