Battery module bottom plate assembly and battery module

Abstract

This utility model relates to the field of battery technology and discloses a base plate assembly for a battery module and a battery module. The base plate assembly includes: a base plate; multiple heat-conducting elements disposed on the base plate and spaced apart; a first heat-insulating element disposed on the base plate and between two adjacent heat-conducting elements to isolate them, wherein the thermal conductivity of the first heat-insulating element is less than that of the heat-conducting elements; wherein the base plate is provided with a heat-insulating groove, the heat-insulating groove being recessed towards the interior of the base plate, and the heat-insulating groove and the first heat-insulating element being disposed opposite to each other in the thickness direction of the base plate. Therefore, by providing this base plate assembly, it is beneficial to block heat transfer between battery cells through the base plate assembly, thereby effectively reducing the risk of heat spread between different battery cells and improving the safety of the battery module.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a base plate assembly for a battery module and a battery module. Background Technology

[0002] Thermal safety is a bottom-line requirement for new energy vehicles. Ensuring that batteries do not experience thermal runaway or thermal propagation during use is crucial. Compared to prismatic and cylindrical batteries, the active materials of pouch batteries are encapsulated in an aluminum-plastic film. However, in the event of thermal runaway, the high-temperature resistance and thermal conductivity of this aluminum-plastic film are far inferior to the metal casings of prismatic and cylindrical batteries. Therefore, preventing thermal propagation in pouch battery systems is a critical challenge that determines whether pouch battery products can continue to be widely used and promoted.

[0003] Current pouch cell products focus on thermal insulation of the large surfaces between batteries to prevent heat spread. For example, aerogel insulation materials and phase change materials are used for thermal insulation between large surfaces. However, heat transfer between batteries does not only occur through the large surfaces of the batteries. According to heat transfer path analysis, a large portion of the heat from the battery is conducted from the bottom and transferred to the next battery through the bottom material, thus causing the next battery to be heated rapidly. Therefore, it is necessary to consider not only the thermal insulation design between the large surfaces of the batteries, but also to block the heat transfer path between the bottoms of the batteries. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a base plate assembly for a battery module, which can help block heat transfer between different battery cells through the base plate assembly, thereby reducing the risk of heat spread between different battery cells.

[0005] This utility model further proposes a battery module.

[0006] According to a first aspect of the present invention, a base plate assembly for a battery module includes: a base plate; a plurality of heat-conducting elements disposed on the base plate and spaced apart thereon; a first heat-insulating element disposed on the base plate and positioned between two adjacent heat-conducting elements to isolate the two adjacent heat-conducting elements, wherein the thermal conductivity of the first heat-insulating element is less than that of the heat-conducting elements; wherein the base plate is provided with a heat-insulating groove, the heat-insulating groove being recessed toward the interior of the base plate, and the heat-insulating groove and the first heat-insulating element being disposed opposite to each other in the thickness direction of the base plate.

[0007] Therefore, by setting up this base plate assembly, it is possible to avoid heat transfer between different cells through the base plate assembly, thereby effectively reducing the risk of heat spread between different cells and improving the safety of the battery module.

[0008] In some examples of this utility model, the heat insulation groove extends along the first direction of the base plate, and there are multiple heat insulation grooves. The multiple heat insulation grooves are spaced apart along the second direction of the base plate. The multiple heat insulation grooves correspond one-to-one with the multiple first heat insulation components. The first direction of the base plate, the second direction of the base plate, and the thickness direction of the base plate are perpendicular to each other.

[0009] In some examples of this utility model, the heat insulation groove extends along the first direction of the base plate, and there are multiple heat insulation grooves. The multiple heat insulation grooves are arranged in a matrix on the base plate along the first direction and the second direction of the base plate. The multiple heat insulation grooves arranged at intervals along the first direction of the base plate correspond to the same first heat insulation component. The first direction of the base plate, the second direction of the base plate and the thickness direction of the base plate are perpendicular to each other.

[0010] In some examples of this utility model, along the first direction of the base plate, the distance between adjacent heat insulation grooves is less than the length of the heat insulation groove; and / or each heat insulation groove includes at least two sub-grooves spaced apart along the second direction of the base plate, and at least two of the sub-grooves are disposed opposite to the first heat insulation member in the thickness direction of the base plate.

[0011] In some examples of this utility model, there are multiple heat insulation grooves, which extend along the first direction of the base plate and are at least partially spaced along the second direction of the base plate. The dimension of the heat insulation groove along the second direction of the base plate is W, and W satisfies the relationship: 2mm≤W≤4mm. The first direction of the base plate, the second direction of the base plate, and the thickness direction of the base plate are perpendicular to each other.

[0012] In some examples of this utility model, the base plate assembly of the battery module further includes: an insulating member disposed on the base plate and at least covering the heat insulation groove, and a plurality of the heat-conducting members and the first heat insulation member disposed on the side of the insulating member away from the base plate.

[0013] In some examples of this utility model, the thermally conductive component includes thermally conductive adhesive; and / or the first thermal insulation component includes one of foam adhesive strip and plastic adhesive strip.

[0014] According to a second aspect of the present invention, a battery module includes: a plurality of battery cells; a base plate assembly of the battery module, wherein the plurality of battery cells are disposed on the base plate assembly, and the heat-conducting element is correspondingly disposed on the bottom of each battery cell.

[0015] In some examples of this utility model, a plurality of the battery cells extend along a first direction of the base plate and are spaced apart along a second direction of the base plate. Along the first direction of the base plate, the minimum distance from the heat insulation groove to one side edge of the base plate in the first direction is less than the minimum distance from the battery cell to one side edge of the base plate in the first direction.

[0016] In some examples of this utility model, a plurality of the battery cells extend along a first direction of the base plate and are spaced apart along a second direction of the base plate; the battery module further includes: a second heat insulation member, the second heat insulation member being disposed between two adjacent battery cells, the second heat insulation member being connected to the first heat insulation member and corresponding to the thickness direction of the base plate.

[0017] 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

[0018] 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 an exploded view of the battery module according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the battery module according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the internal position of the end of the battery module according to an embodiment of the present utility model; Figure 4 This is a partial structural schematic diagram of a battery module according to an embodiment of the present utility model; Figure 5 yes Figure 4 Enlarged view of a portion of the image; Figure 6 This is a structural schematic diagram of the base plate assembly according to an embodiment of the present utility model; Figure 7 yes Figure 6 Enlarged view of a portion of the image; Figure 8 This is a partial structural schematic diagram of the base plate assembly according to an embodiment of the present utility model; Figure 9 yes Figure 8 Enlarged view of a portion of the image; Figure 10 This is a schematic diagram of the structure of the base plate according to an embodiment of the present utility model; Figure 11This is a schematic diagram of the structure of the base plate according to another embodiment of the present utility model; Figure 12 This is a schematic diagram of the structure of the base plate according to another embodiment of the present invention.

[0019] Figure label: 100. Base plate assembly; 200. Battery module; 201. Battery cell; 202. Second heat insulation component; 10. Base plate; 11. Insulation groove; 111. Sub-groove; 20. Heat-conducting component; 30. First heat-insulating component; 40. Insulating component. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0021] The following is for reference. Figures 1-12 The base plate assembly 100 of the battery module 200 according to an embodiment of the present utility model is described. The base plate assembly 100 of the battery module 200 can be applied to a soft-pack battery.

[0022] Combination Figures 1-12 As shown, the base plate assembly 100 of the battery module 200 according to the first aspect embodiment of the present invention includes a base plate 10, a plurality of heat-conducting components 20, and a first heat-insulating component 30. The base plate 10 serves as a partial load-bearing structural component of the battery module 200's external outline, and can be used to stably support and fix other components within the battery module 200. The heat-conducting components 20 can be used to quickly conduct heat from the battery cells 201 within the battery module 200 to the base plate 10, preventing localized overheating of the battery cells 201 and mitigating the risk of thermal runaway. The first heat-insulating component 30 can block heat, preventing heat diffusion to the surrounding area and thus avoiding the risk of heat spread. In summary, through the cooperation of these three components, the base plate assembly 100 achieves structural stability, directional heat conduction, and regional heat insulation, ensuring the long-term stability and safety of the equipment.

[0023] Specifically, multiple heat-conducting components 20 are disposed on the base plate 10 and are spaced apart on the base plate 10. A first heat-insulating component 30 is disposed on the base plate 10 and is positioned between two adjacent heat-conducting components 20 to isolate them. The thermal conductivity of the first heat-insulating component 30 is less than that of the heat-conducting components 20. For example, the heat-conducting component 20 can be thermally conductive adhesive, but is not limited to this.

[0024] Specifically, multiple spaced heat-conducting components 20 correspond to one or more battery cells 201, and can directly receive and conduct the heat of the corresponding battery cell 201, allowing the heat to be quickly and directionally transferred to the base plate 10, reducing the disorderly diffusion of heat between battery cells 201. Furthermore, since a first heat-insulating component 30 with a lower thermal conductivity is provided between two adjacent heat-conducting components 20, the lower thermal conductivity means better heat insulation, which can limit the heat to a predetermined conduction path. That is, the heat emitted by the battery cell 201 goes to the base plate 10 instead of spreading to adjacent battery cells 201. This can effectively block the heat transfer between adjacent heat-conducting components 20, prevent the high temperature of a single battery cell 201 from spreading to the surrounding battery cells 201 through the heat-conducting component 20 and causing heat superposition, and at the same time prevent heat loss to non-heat dissipation areas, ensuring that the heat is concentrated and directionally dissipated through the base plate 10, thereby improving the stability of the working environment of the battery cell 201 and the overall heat dissipation efficiency.

[0025] In addition, the pre-set first heat insulation component 30 facilitates the quick and accurate arrangement of the heat-conducting component 20. Moreover, since the first heat insulation component 30 at the bottom of the cell 201 separates the heat-conducting component 20, it can prevent the heat of the cell 201 from being transferred to the adjacent cells 201 through the heat-conducting component 20 at the bottom of the battery module 200. It can also guide the heat of the cell 201 to diffuse from the bottom of the base plate 10 in a directional manner, thereby avoiding the risk of subsequent thermal runaway of the cell 201. It can also help improve the temperature uniformity of multiple cells 201 inside the battery module 200, thereby improving the safety and working stability of the battery module 200.

[0026] Specifically, the base plate 10 is provided with a heat insulation groove 11, which is recessed towards the interior of the base plate 10, and the heat insulation groove 11 and the first heat insulation member 30 are arranged opposite to each other in the thickness direction of the base plate 10.

[0027] In this design, since there are two heat transfer paths between the battery cells 201 in the battery module 200 (one through the heat conductor 20 and the other through the base plate 10), and the base plate 10 has a recessed heat insulation groove 11 facing inwards, the continuous solid structure of the base plate 10 can be cut off or reduced at the location of the heat insulation groove 11. This forces heat to dissipate outwards along the connecting parts on the base plate 10, effectively preventing the risk of heat being transferred to adjacent battery cells 201 through the base plate 10. In addition, the heat insulation groove 11 is filled with air. The thermal conductivity of air is about 0.023 W / (m·K), which is much lower than that of metals, such as aluminum, which has a thermal conductivity of about 237 W / (m·K), commonly used base plate materials. Furthermore, the air inside the heat insulation groove 11 is usually in a relatively static state, which reduces heat transfer caused by air convection. At this time, the air mainly transfers heat through extremely inefficient conduction and radiation, and the overall heat insulation capacity is much stronger than that of solid materials.

[0028] Furthermore, the first heat insulation component 30 can effectively block heat transfer between adjacent heat-conducting components 20, while the heat insulation groove 11 can effectively block heat transfer at the position of the base plate 10 in the heat insulation groove 11. Moreover, the two are arranged opposite to each other in the thickness direction of the base plate 10, that is, the two are precisely matched in the thickness direction, avoiding heat insulation blind spots caused by misalignment in the thickness direction. Thus, both paths of heat transfer between adjacent cells 201 through the bottom are blocked, effectively preventing heat from being transferred between different cells 201 through the base plate assembly 100. Instead, the heat is forced to diffuse to the outside of the base plate 10, thereby effectively reducing the risk of thermal runaway of the battery module 200 and improving the safety of the battery module 200.

[0029] Compared to traditional battery modules, which mainly use aerogel insulation materials and phase change materials for thermal insulation between large surfaces of the cells, heat transfer between cells is not limited to their large surfaces. According to heat transfer path analysis, a large portion of the heat on the cell is also conducted from the bottom and transferred to surrounding cells through the bottom material, thus causing the next cell to be heated quickly. The bottom plate assembly 100 in this case can specifically block the path of heat transfer between different cells 201 through the bottom of the battery module 200, thereby further reducing the risk of thermal runaway of the cell 201.

[0030] Therefore, by setting the base plate assembly 100, heat can be effectively blocked from being transferred between different cells 201 through the base plate assembly 100, thereby effectively reducing the risk of heat spread between different cells 201 and improving the safety of the battery module 200.

[0031] According to some optional embodiments of the present invention, combined with Figure 1 , Figures 10-12 As shown, the heat insulation groove 11 extends along the first direction of the base plate 10, and there are multiple heat insulation grooves 11. The multiple heat insulation grooves 11 are spaced apart along the second direction of the base plate 10. The multiple heat insulation grooves 11 correspond one-to-one with multiple first heat insulation components 30. The first direction of the base plate 10, the second direction of the base plate 10 and the thickness direction of the base plate 10 are perpendicular to each other.

[0032] The first direction can be the width direction, and the second direction can be the length direction. The heat insulation groove 11 extends along the width direction of the base plate 10, and multiple heat insulation grooves 11 are arranged at intervals along the length direction of the base plate 10. The length direction of the base plate 10 is consistent with the stacking direction of the multiple battery cells 201. This allows the multiple heat insulation grooves 11 to form multiple heat blocking bands in the length direction of the base plate 10, preventing heat from being continuously transferred along the length direction of the base plate 10, thereby effectively reducing local heat accumulation and improving the overall heat insulation efficiency.

[0033] According to some optional embodiments of the present invention, combined with Figure 1 , Figures 11-12 As shown, the heat insulation groove 11 extends along the first direction of the base plate 10. There are multiple heat insulation grooves 11. The multiple heat insulation grooves 11 are arranged in a matrix on the base plate 10 along the first direction and the second direction of the base plate 10. The multiple heat insulation grooves 11 arranged at intervals along the first direction of the base plate 10 correspond to the same first heat insulation element 30. The first direction of the base plate 10, the second direction of the base plate 10 and the thickness direction of the base plate 10 are perpendicular to each other.

[0034] The first direction can be the width direction, and the second direction can be the length direction. The length direction is consistent with the stacking direction of the multiple battery cells 201. The heat insulation grooves 11 extend along the width direction of the base plate 10, and the multiple heat insulation grooves 11 are arranged in a matrix on the base plate 10 along the width and length directions of the base plate 10. This can improve the regularity of the arrangement of the multiple heat insulation grooves 11. In addition, the multiple heat insulation grooves 11 arranged at intervals along the first direction of the base plate 10 correspond to the same first heat insulation element 30. This can ensure that the base plate 10 forms multiple heat blocking bands in its length direction, thereby reducing the risk of heat transfer between the battery cells 201 through the base plate 10. On the other hand, it can also make the multiple heat insulation grooves 11 form an uninterrupted solid continuous structure in the width direction of the base plate 10, thereby improving the overall structural strength of the base plate 10 and taking into account both the safety and structural reliability of the base plate 10.

[0035] In addition, the multiple heat insulation grooves 11 are spaced apart along the first direction, which can also prevent the overall structural strength of the base plate 10 from being excessively weakened due to the opening of long grooves, and ensure that the base plate 10 is not easily deformed when bearing the installation components or dealing with minor external forces, thus maintaining structural stability.

[0036] Specifically, in combination Figure 11 and Figure 12 As shown, along the first direction of the base plate 10, the distance between adjacent heat insulation grooves 11 is less than the length of the heat insulation groove 11.

[0037] It is understandable that the distance between adjacent heat insulation grooves 11 is smaller than the length of the heat insulation groove 11 along the first direction of the base plate 10. This allows the groove length of the heat insulation groove 11 to be increased within the limited space of the base plate 10, which helps the heat insulation groove 11 to better block the heat conduction path along the second direction of the base plate 10, thereby effectively preventing heat transfer between adjacent cells 201 through the base plate 10 and reducing the risk of thermal runaway.

[0038] Furthermore, the spacing between adjacent heat insulation grooves 11 in the first direction of the base plate 10 is less than the length of the heat insulation groove 11. This allows the supporting connection area between the heat insulation grooves 11 to maintain a reasonable width, which avoids the problem of insufficient local rigidity and easy deformation of the base plate 10 due to excessively long heat insulation grooves 11. It also reduces the weakening of the overall structural strength of the base plate 10 by the heat insulation grooves 11 through multiple supporting connection areas spaced apart in the first direction of the base plate 10. This ensures that the base plate 10 can still meet the basic usage requirements such as fixing and load-bearing while having heat insulation function.

[0039] Furthermore, combined Figure 12 As shown, each heat insulation groove 11 includes at least two sub-grooves 111 spaced apart along the second direction of the base plate 10, and at least two sub-grooves 111 are arranged opposite to the first heat insulation member 30 in the thickness direction of the base plate 10.

[0040] In other words, each heat insulation groove 11 is divided into at least two sub-grooves 111 spaced apart along the second direction of the base plate 10, and all sub-grooves 111 of a single heat insulation groove 11 correspond to the same heat insulation component in the thickness direction of the base plate 10. This can, on the one hand, prevent heat from being transferred through the base plate 10 at the heat insulation groove 11, and on the other hand, establish a connecting support area along the second direction of the base plate 10 in each heat insulation groove 11, thereby reducing the weakening of the overall structural strength of the base plate 10 by the heat insulation groove 11. Thus, while ensuring that the base plate 10 has the function of heat insulation, it can also meet the basic structural strength requirements such as fixation and load-bearing.

[0041] According to some optional embodiments of the present invention, combined with Figure 1 , Figures 11-12 As shown, there are multiple heat insulation grooves 11. The multiple heat insulation grooves 11 extend along the first direction of the base plate 10 and are at least partially spaced along the second direction of the base plate 10. The dimension of the heat insulation groove 11 along the second direction of the base plate 10 is W, and W satisfies the relationship: 2mm≤W≤4mm. The first direction of the base plate 10, the second direction of the base plate 10 and the thickness direction of the base plate 10 are perpendicular to each other.

[0042] In this design, the first direction can be the width direction, and the second direction can be the length direction. The heat insulation groove 11 extends along the width direction of the base plate 10. When the dimension of the heat insulation groove 11 along the length direction of the base plate 10 is less than 2mm, the groove width of the heat insulation groove 11 may be too small, leading to poor heat insulation effect and high processing difficulty. Conversely, when the dimension of the heat insulation groove 11 along the length direction of the base plate 10 is greater than 4mm, the groove width of the heat insulation groove 11 may be too large, potentially weakening the structural strength of the base plate 10. In summary, controlling the dimension of the heat insulation groove 11 along the length direction of the base plate 10 within a reasonable range can simultaneously ensure both the heat insulation effect of the heat insulation groove 11 and the structural strength of the base plate 10, thereby improving the rationality of the layout. For example, the dimension W of the heat insulation groove 11 along the second direction of the base plate 10 can be 2mm, 2.5mm, 3mm, or 4mm, and is not limited to these.

[0043] According to some optional embodiments of the present invention, combined with Figure 1 , Figures 3-12 As shown, the base plate assembly 100 of the battery module 200 also includes an insulating member 40, which is disposed on the base plate 10 and at least covers the heat insulation groove 11. A plurality of heat-conducting members 20 and a first heat insulation member 30 are disposed on the side of the insulating member 40 opposite to the base plate 10. For example, the insulating member 40 can be a PET insulating film, but is not limited thereto.

[0044] Specifically, the insulating component 40 covers the heat insulation groove 11, which can build an electrical insulation barrier between the base plate 10 and other components, avoid the risk of leakage, and prevent dust, impurities and other contaminants from entering the heat insulation groove 11, thereby improving the electrical safety protection of the base plate assembly 100, such as IP protection.

[0045] Alternatively, the heat-conducting component 20 is a heat-conducting adhesive, and the first heat-insulating component 30 can be an adhesive-blocking strip. Since the first heat-insulating component 30 is disposed between adjacent heat-conducting components 20, the adhesive-blocking strip can restrict the flow range of the heat-conducting adhesive, prevent the adhesive from flowing randomly or affecting the heat conduction efficiency due to uneven adhesive distribution, and further help fix the relative position of the heat-conducting adhesive and the insulating component 40, thereby improving the reliability and accuracy of the overall assembly.

[0046] Alternatively, multiple first heat insulation elements 30 are arranged at equal intervals, and each first heat insulation element 30 has the same length. Specifically, to ensure a more uniform distribution of the heat-conducting elements 20 at the bottom of the battery cell 201, multiple first heat insulation elements 30 are arranged at equal intervals, thereby facilitating the equidistant distribution of each heat-conducting element 20. The battery cell 201 is placed on the heat-conducting elements 20, and heat is transferred through the heat-conducting elements 20, but it will not diffuse to subsequent battery cells 201. The equal length of each first heat insulation element 30 ensures uniform heat insulation effect.

[0047] Alternatively, the heat-conducting component 20 includes thermally conductive adhesive with a high thermal conductivity, typically around 2 W / m / K. This facilitates the heat-conducting component 20 in quickly dissipating heat from the battery cell 201, thereby improving the heat dissipation efficiency of the battery cell 201.

[0048] Preferably, the first heat insulation component 30 can be a foam sealing strip. Foam material has a low thermal conductivity, which means it has a good heat insulation effect. Its thermal conductivity is almost comparable to that of air. It is also compressible and has low hardness, so it will not form a hard contact with the battery and damage the battery. Moreover, it has high process feasibility, that is, it can be directly pasted. The installation and operation are simple, the heat insulation effect is good, and the cost is also very low. Therefore, using a foam sealing strip can effectively improve the practicality and economy of the first heat insulation component 30.

[0049] Alternatively, the first heat insulation element 30 can be a plastic baffle strip, that is, it is made of plastic, which has insulating properties and can directly contact the battery cell 201. The thermal conductivity of plastic is usually between 0.15W / m / k and 0.25W / m / k, while thermally conductive adhesive has a higher thermal conductivity, generally around 2W / m / k. The thermal conductivity of the plastic baffle strip is an order of magnitude lower than that of the thermally conductive adhesive, so that the first heat insulation element 30 can effectively perform the heat insulation effect.

[0050] Combination Figures 1-12 As shown, the battery module 200 according to the second aspect embodiment of the present utility model includes a plurality of battery cells 201 and a base plate assembly 100 of the battery module 200 of the above embodiment. The plurality of battery cells 201 are disposed on the base plate assembly 100, and a heat-conducting component 20 is correspondingly disposed at the bottom of each battery cell 201.

[0051] The above settings ensure that the heat generated by each cell 201 can be quickly transferred to the outside through a dedicated heat conduction path, avoiding the risk of local high temperature caused by uneven heat dissipation between cells 201, effectively suppressing the risk of thermal runaway, improving the consistency of the operating temperature of each cell 201, delaying capacity decay, extending the overall service life, and further enhancing the market competitiveness of the product.

[0052] For example, the thermal conductive component 20 can be thermally conductive adhesive. The thermally conductive adhesive can fill the tiny gap between the bottom of the cell 201 and the base plate 10, eliminate the air insulation layer, and effectively improve the thermal conductivity. This helps the cell 201 to quickly transfer heat to the outside. In addition, the flexible properties of the thermally conductive adhesive can buffer the deformation and stress of the cell 201 under charging and discharging cycles or vibration environments, reduce mechanical damage, and also play an insulating role to prevent short circuit hazards between the cell 201 and metal parts, thus comprehensively improving the reliability of the battery module 200.

[0053] Optionally, each heat-conducting element 20 is adapted to correspond to at least one battery cell 201. For example, a heat-conducting element 20 may establish a thermally conductive connection with one or two battery cells 201, and is not limited thereto.

[0054] According to some optional embodiments of the present invention, combined with Figures 1-12 As shown, a plurality of battery cells 201 extend along a first direction of the base plate 10, and the plurality of battery cells 201 are spaced apart along a second direction of the base plate 10.

[0055] Specifically, the extension directions of the battery cell 201, the heat-conducting component 20, the first heat-insulating component 30, and the heat-insulating groove 11 are the same, which is also the first direction. Furthermore, the battery cell 201, the heat-conducting component 20, the first heat-insulating component 30, and the heat-insulating groove 11 are also distributed at intervals along the same direction, which refers to the second direction. This can better and more thoroughly block the heat transfer path between different battery cells 201 on the base plate assembly 100, thereby reducing the risk of thermal runaway of the battery module 200 and improving the safety of the battery module 200.

[0056] Furthermore, the minimum distance between the heat insulation groove 11 and one edge of the base plate 10 in the first direction is less than the minimum distance between the battery cell 201 and one edge of the base plate 10 in the first direction. With this arrangement, in the first direction of the base plate 10, the heat insulation groove 11 is closer to one edge of the base plate 10 in the first direction than the battery cell 201. This can actively cover part of the blank area between the battery cell 201 and the edge, thereby avoiding the problem that different battery cells 201 can directly transfer heat through the continuous structure of the base plate 10 at the location of their outer edges. This ensures that a thermal barrier is also formed on the edge side between different battery cells 201, avoiding the risk of thermal runaway.

[0057] Alternatively, along the first direction of the base plate 10, the slot length of the heat insulation groove 11 is less than the length of the battery cell 201. This allows the heat insulation groove 11 to cover the structural dimensions of the battery cell 201 in the first direction of the base plate 10, thereby enabling the heat insulation groove 11 to block the lateral path that can directly participate in heat transfer between different battery cells 201 on the base plate 10. The lateral path is the second direction, which in turn increases the heat insulation coverage of the heat insulation groove 11 in the second direction of the base plate 10.

[0058] According to some optional embodiments of the present invention, combined with Figures 1-12 As shown, multiple battery cells 201 extend along a first direction of the base plate 10, and the multiple battery cells 201 are spaced apart along a second direction of the base plate 10; the battery module 200 also includes a second heat insulation member 202, which is disposed between two adjacent battery cells 201, and is connected to a first heat insulation member 30, and the second heat insulation member 202 and the first heat insulation member 30 correspond to each other in the thickness direction of the base plate 10.

[0059] Specifically, in combination Figures 1-12 As shown, the second heat insulation component 202 is vertically disposed between two adjacent battery cells 201 along the thickness direction of the base plate 10. This effectively prevents the two adjacent battery cells 201 from directly transferring heat to each other through their large surfaces, thereby effectively reducing the risk of heat spread between different battery cells 201. Furthermore, the second heat insulation component 202 and the first heat insulation component 30 correspond to each other in the thickness direction of the base plate 10. This allows the installation position of the second heat insulation component 202 to precisely correspond to the first heat insulation component 30, avoiding the generation of heat insulation blind spots due to misalignment between the two, ensuring seamless heat isolation between different battery cells 201, and effectively delaying the heat diffusion to the surrounding area when a single battery cell 201 experiences thermal runaway.

[0060] Meanwhile, the first heat insulation component 30 itself has the function of assisting in fixing the battery cell 201 and limiting the displacement of the battery cell 201. The second heat insulation component 202 is connected to the first heat insulation component 30 and is positioned accordingly. In this way, the first heat insulation component 30 can be used to achieve its own stable installation, and prevent the second heat insulation component 202 from loosening or shifting under conditions such as vibration and impact of the battery module 200. This not only ensures the continuity of the heat insulation function, but also indirectly helps to strengthen the fixing effect of the battery cell 201 and reduces the structural risks caused by the shaking of the battery cell 201.

[0061] Furthermore, the design that the second heat insulation component 202 corresponds to the first heat insulation component 30 in the thickness direction of the base plate 10 can simplify the assembly process. When assembling the battery module 200, the first heat insulation component 30 can serve as the positioning reference for the second heat insulation component 202, eliminating the need for additional adjustment of the orientation and position of the second heat insulation component 202, thereby improving production efficiency.

[0062] 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", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] 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., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0065] 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 base plate assembly (100) for a battery module (200), characterized in that, include: Base plate (10); Multiple heat-conducting elements (20) are disposed on the base plate (10) and distributed at intervals on the base plate (10); The first heat insulation element (30) is disposed on the base plate (10) and is disposed between two adjacent heat-conducting elements (20) to isolate the two adjacent heat-conducting elements (20). The thermal conductivity of the first heat insulation element (30) is less than that of the heat-conducting element (20). The base plate (10) is provided with a heat insulation groove (11), which is recessed towards the interior of the base plate (10). The heat insulation groove (11) and the first heat insulation member (30) are arranged opposite to each other in the thickness direction of the base plate (10).

2. The base plate assembly (100) of the battery module (200) according to claim 1, characterized in that, The heat insulation groove (11) extends along the first direction of the base plate (10), and there are multiple heat insulation grooves (11). The multiple heat insulation grooves (11) are spaced apart along the second direction of the base plate (10). The multiple heat insulation grooves (11) correspond one-to-one with the multiple first heat insulation components (30). The first direction of the base plate (10), the second direction of the base plate (10) and the thickness direction of the base plate (10) are perpendicular to each other.

3. The base plate assembly (100) of the battery module (200) according to claim 1, characterized in that, The heat insulation groove (11) extends along the first direction of the base plate (10). There are multiple heat insulation grooves (11). Multiple heat insulation grooves (11) are arranged in a matrix on the base plate (10) along the first direction and the second direction of the base plate (10). Multiple heat insulation grooves (11) arranged at intervals along the first direction of the base plate (10) correspond to the same first heat insulation component (30). The first direction of the base plate (10), the second direction of the base plate (10) and the thickness direction of the base plate (10) are perpendicular to each other.

4. The base plate assembly (100) of the battery module (200) according to claim 3, characterized in that, Along a first direction of the base plate (10), the distance between adjacent heat insulation grooves (11) is less than the length of the heat insulation groove (11); and / or Each of the heat insulation grooves (11) includes at least two sub-grooves (111) spaced apart along a second direction of the base plate (10), and at least two of the sub-grooves (111) are arranged opposite to the first heat insulation member (30) in the thickness direction of the base plate (10).

5. The base plate assembly (100) of the battery module (200) according to claim 1, characterized in that, The number of heat insulation grooves (11) is multiple. The multiple heat insulation grooves (11) extend along the first direction of the base plate (10) and are at least partially spaced along the second direction of the base plate (10). The dimension of the heat insulation groove (11) along the second direction of the base plate (10) is W, and W satisfies the relationship: 2mm≤W≤4mm. The first direction of the base plate (10), the second direction of the base plate (10) and the thickness direction of the base plate (10) are perpendicular to each other.

6. The base plate assembly (100) of the battery module (200) according to claim 1, characterized in that, Also includes: An insulating element (40) is disposed on the base plate (10) and at least covers the heat insulation groove (11). A plurality of heat-conducting elements (20) and the first heat insulation element (30) are disposed on the side of the insulating element (40) away from the base plate (10).

7. The base plate assembly (100) of the battery module (200) according to claim 1, characterized in that, The thermal conductive element (20) includes thermally conductive adhesive and / or The first heat insulation element (30) includes one of foam sealing strip and plastic sealing strip.

8. A battery module (200), characterized in that, include: Multiple battery cells (201); The base plate assembly (100) of the battery module (200) according to any one of claims 1-7, wherein the plurality of battery cells (201) are disposed on the base plate assembly (100), and the bottom of each battery cell (201) is correspondingly provided with the heat-conducting element (20).

9. The battery module (200) according to claim 8, characterized in that, The plurality of said cells (201) extend along the first direction of the base plate (10) and are spaced apart along the second direction of the base plate (10). Along the first direction of the base plate (10), the minimum distance from the heat insulation groove (11) to one side edge of the base plate (10) in the first direction is less than the minimum distance from the cell (201) to one side edge of the base plate (10) in the first direction.

10. The battery module (200) according to claim 8, characterized in that, The plurality of said cells (201) extend along a first direction of the base plate (10) and are spaced apart along a second direction of the base plate (10); The battery module (200) further includes: The second heat insulation element (50) is disposed between two adjacent cells (201), and the second heat insulation element (50) is connected to the first heat insulation element (30) and corresponds to the thickness direction of the base plate (10).

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