Battery module, battery pack and electric device

Abstract

The invention discloses a battery module, a battery pack and a power utilization device, the battery module comprises a plurality of battery assemblies, the plurality of battery assemblies are arranged along a first direction, each battery assembly comprises a plurality of cylindrical battery packs arranged along a second direction, each cylindrical battery pack comprises a plurality of cylindrical batteries arranged along a third direction, the axes of the cylindrical batteries extend in the first direction, a cold plate is arranged between any two adjacent cylindrical battery packs in the second direction, and the multiple cold plates of the multiple battery assemblies are spaced and connected in series. According to the battery module provided by the invention, the production cost can be reduced. Meanwhile, the whole cooling system is simpler in structure, efficient layout can be easily achieved in a limited space, maintenance is convenient, and possible fault points can be easily positioned and repaired.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery module, battery pack, and power-consuming device. Background Technology

[0002] Among the related technologies, battery types include cylindrical batteries, prismatic batteries, and pouch batteries. Cylindrical batteries have higher energy density, better safety and stability, and lower cost, and have been widely used in electric vehicles. They are expected to become the future development trend of electric vehicle batteries. However, the cooling cost of existing cylindrical batteries is relatively high. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a battery module that is low in cost and simple in structure.

[0004] The present invention also proposes a battery pack, which includes the battery module described above.

[0005] The present invention also proposes an electrical device, which includes the battery pack described above.

[0006] According to an embodiment of the present invention, a battery module includes a plurality of battery components arranged along a first direction. Each battery component includes a plurality of cylindrical battery packs arranged along a second direction. Each cylindrical battery pack includes a plurality of cylindrical batteries arranged along a third direction. The axis of the cylindrical batteries extends along the first direction. Along the second direction, a cold plate is provided between any two adjacent cylindrical battery packs. The plurality of cold plates of the plurality of battery components are spaced apart and connected in series. The first direction, the second direction, and the third direction are perpendicular to each other.

[0007] According to embodiments of the present invention, by providing a separate cold plate in each battery module and connecting multiple cold plates of multiple battery modules in series, the cold plate area between two adjacent battery modules can be reduced, thereby reducing the cold plate cost of the battery module. Furthermore, it reduces complex shunt and merging designs, simplifies the materials and processes required in manufacturing, and helps reduce production costs. Simultaneously, it makes the entire cooling system structure simpler, easier to achieve efficient layout in limited space, and easier to maintain, facilitating the location and repair of potential fault points.

[0008] According to some embodiments of the present invention, each of the cold plates is provided with connecting components at both ends along the third direction. The connecting components include: a current collector connected to the cold plate and having a current collection channel communicating with the cold plate; and a clamping plate stacked and connected to the current collector along the second direction. The clamping plate has a first mounting hole communicating with the current collection channel, and a pipe connecting the cold plate is connected to the clamping plate and communicating with the first mounting hole.

[0009] In some embodiments of the present invention, the current collector has a second mounting hole communicating with the current collection channel on the side facing the clamping plate, the clamping plate has a mounting post that mates with the second mounting hole, and the first mounting hole penetrates the mounting post.

[0010] In some embodiments of the present invention, a sealing ring is provided between the mounting post and the inner peripheral wall of the second mounting hole.

[0011] In some embodiments of the present invention, the clamping plate and the current collector are connected by fasteners.

[0012] According to some embodiments of the present invention, two adjacent cylindrical battery packs along the second direction are defined as a first cylindrical battery pack and a second cylindrical battery pack. In the same battery assembly, a plurality of cylindrical batteries of the first cylindrical battery pack and a plurality of cylindrical batteries of the second cylindrical battery pack are staggered along the third direction. The cold plate includes a plurality of first protrusions and a plurality of second protrusions. The plurality of first protrusions and the plurality of second protrusions are alternately arranged and connected along the third direction. The first protrusions are arranged opposite to the cylindrical batteries of the first cylindrical battery pack along the second direction and protrude toward the direction of the second cylindrical battery pack. The second protrusions are arranged opposite to the cylindrical batteries of the second cylindrical battery pack along the second direction and protrude toward the direction of the first cylindrical battery pack.

[0013] In some embodiments of the present invention, the second direction is the up-down direction, the second cylindrical battery pack is located below the first cylindrical battery pack, and the side of the cold plate facing the second cylindrical battery pack is provided with a heating film.

[0014] In some embodiments of the present invention, along the third direction, the heating power at both ends of the heating film is higher than the heating power in the middle region of the heating film.

[0015] In some embodiments of the present invention, along the third direction, the heating power of the heating film relative to the four outermost cylindrical batteries of the first and second cylindrical battery packs is Z, and the heating power of the remaining areas is X, satisfying: 1.4X≤Z≤1.6X.

[0016] In some embodiments of the present invention, in two adjacent first protrusions and second protrusions, the heating power of the heating film in the region opposite to the first protrusion is A, and the heating power of the heating film in the region opposite to the second protrusion is B, and satisfies: 1.1B≤A≤1.2B.

[0017] In some embodiments of the present invention, the cold plate has a plurality of flow channels spaced apart along the first direction, and a dividing rib is provided between two adjacent flow channels.

[0018] In some embodiments of the present invention, along the second direction, the thickness of the cold plate is a, and satisfies: 2mm≤a≤5mm; and / or, along the first direction, the size of the flow channel is b, and along the second direction, the thickness of the cold plate is a, and satisfies: a / 3≤b≤a / 2; and / or, along the first direction, the size of the flow channel is b, and the size of the dividing rib is c, and satisfies: 2b / 3≤c≤b; and / or, along the second direction, the wall thickness of the flow channel is d, and satisfies: a / 4≤d≤a / 2.

[0019] In some embodiments of the present invention, in the same battery assembly, there are two cylindrical battery packs and one cold plate.

[0020] According to an embodiment of the present invention, a battery pack includes: a housing; and the battery module described above, wherein the battery module is disposed within the housing.

[0021] According to the battery pack of the present invention, by setting the above-mentioned battery modules, each battery module has a separate cold plate, and the cold plates of multiple battery modules are connected in series, which can reduce the cold plate area between two adjacent battery modules and reduce the cold plate cost of the battery module. In addition, it can reduce complex shunt and merging designs, simplify the materials and processes required in the manufacturing process, and help reduce production costs. At the same time, it makes the entire cooling system structure simpler, easier to achieve efficient layout in a limited space, and easier to maintain, and easier to locate and repair potential fault points.

[0022] An electrical device according to an embodiment of the present invention includes the battery pack described above.

[0023] According to embodiments of the present invention, the electrical device, by providing the aforementioned battery pack including the aforementioned battery modules, and by providing a separate cold plate in each battery module, and connecting multiple cold plates of multiple battery modules in series, can reduce the cold plate area between two adjacent battery modules, thereby reducing the cold plate cost of the battery module. Furthermore, it can reduce complex shunt and merging designs, simplify the materials and processes required in the manufacturing process, and help reduce production costs. Simultaneously, it makes the entire cooling system structure simpler, facilitates efficient layout within a limited space, and is easy to maintain, making it easy to locate and repair potential fault points.

[0024] Additional aspects and advantages of the 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

[0025] The above and / or additional aspects and advantages of the present invention 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 perspective view of a battery pack according to an embodiment of the present invention; Figure 2 This is a top view of a battery pack according to an embodiment of the present invention; Figure 3 This is a perspective view of a battery module according to an embodiment of the present invention; Figure 4 This is a side view of a battery module according to an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of point A in the middle; Figure 6 This is a perspective view of the cold plate, heating film, and connecting components of a battery module according to an embodiment of the present invention; Figure 7 This is a perspective view of the cold plate, heating film, and connecting components of a battery module according to an embodiment of the present invention; Figure 8 yes Figure 7 Enlarged view of point B in the middle; Figure 9 This is a perspective view of the cold plate and connecting components of a battery module according to an embodiment of the present invention; Figure 10 yes Figure 9 Enlarged view of point C in the middle; Figure 11 This is a top view of the cold plate, heating film, and connecting assembly according to an embodiment of the present invention; Figure 12 It is along Figure 11 Sectional view of the DD line; Figure 13 yes Figure 12 Enlarged view at point F; Figure 14 It is along Figure 11 Sectional view of the middle EE line; Figure 15 yes Figure 14 A magnified view of point G in the middle.

[0026] Figure label: 1000, battery pack; 100. Battery module; 10. Battery components; 1. First cylindrical battery pack; 11. Cylindrical battery; 2. Second cylindrical battery pack; 3. Cold plate; 31. First protrusion; 32. Second protrusion; 33. Flow channel; 34. Dividing rib; 5. Connecting assembly; 51. Current collector; 512. Second mounting hole; 52. Clamping plate; 521. First mounting hole; 522. Mounting post; 53. Sealing ring; 54. Fastener; 6. Heating film; 7. First thermally conductive adhesive; 8. Second thermally conductive adhesive; 91. Inlet pipe; 92. First pipeline; 993. Second pipeline; 94. Third pipeline; 95. Outlet pipe; 200. Box body. Detailed Implementation

[0027] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The following is for reference. Figures 1-15 A battery module 100 according to an embodiment of the present invention is described.

[0030] like Figures 1-4 As shown, the battery module 100 according to an embodiment of the present invention includes a plurality of battery components 10.

[0031] Specifically, multiple battery modules 10 are arranged along a first direction, each battery module 10 includes multiple cylindrical battery packs arranged along a second direction, each cylindrical battery pack includes multiple cylindrical batteries 11 arranged along a third direction, the axis of the cylindrical battery 11 extends along the first direction, and a cold plate 3 is provided between any two adjacent cylindrical battery packs along the second direction. The multiple cold plates 3 of the multiple battery modules 10 are spaced apart and connected in series, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0032] Along the second direction, two adjacent cylindrical battery packs are defined as a first cylindrical battery pack 1 and a second cylindrical battery pack 2. A cold plate 3 is provided between the first cylindrical battery pack 1 and the second cylindrical battery pack 2, that is, the first cylindrical battery pack 1 and the second cylindrical battery pack 2 are arranged along the second direction, and the cold plate 3 is located between the first cylindrical battery pack 1 and the second cylindrical battery pack 2. Each of the first cylindrical battery pack 1 and the second cylindrical battery pack 2 includes multiple cylindrical batteries 11 arranged along a third direction, and the axis of the cylindrical battery 11 extends along the first direction.

[0033] It is understandable that when the number of cylindrical battery packs in the same battery module 10 is greater than 2, there are multiple cold plates 3, and the cold plates 3 between any two adjacent cylindrical battery packs are spaced apart from each other.

[0034] When the temperature of the cooling medium flowing inside the cold plate 3 is low, the cold plate 3 in each battery assembly 10 is used to cool the cylindrical batteries 11 in the first cylindrical battery pack 1 and the second cylindrical battery pack 2 on both sides of the second direction. Of course, the present invention is not limited to this. When the temperature of the cooling medium flowing inside the cold plate 3 is high, the cold plate 3 in each battery assembly 10 is used to heat the cylindrical batteries 11 in the first cylindrical battery pack 1 and the second cylindrical battery pack 2 on both sides of the second direction.

[0035] Among them, reference Figures 4-8As shown, a first thermally conductive adhesive 7 is provided between the multiple cylindrical batteries 11 in the first cylindrical battery pack 1 and the cold plate 3, and the multiple cylindrical batteries 11 in the first cylindrical battery pack 1 and the cold plate 3 are bonded and connected by the first thermally conductive adhesive 7. A second thermally conductive adhesive 8 is provided between the multiple cylindrical batteries 11 in the second cylindrical battery pack 2 and the cold plate 3, and the multiple cylindrical batteries 11 in the second cylindrical battery pack 2 and the cold plate 3 are bonded and connected by the second thermally conductive adhesive 8.

[0036] In this invention, each battery module 10 is provided with a separate cold plate 3, which reduces the area of ​​the cold plate 3 between two adjacent battery modules 10 and reduces the cost of the cold plate 3 in the battery module 100. Furthermore, multiple cold plates 3 are connected in series via pipelines, reducing complex flow splitting and merging designs. Therefore, the materials and processes required during manufacturing are relatively simple, helping to reduce production costs. Simultaneously, the series-connected cold plates 3 eliminate the need for complex flow splitting and merging designs, making the entire cooling system structure simpler and easier to implement efficiently in a limited space. Moreover, the series-connected cold plates 3 are relatively convenient to maintain, making it easier to locate and repair potential fault points.

[0037] According to an embodiment of the present invention, the battery module 100, by providing a separate cold plate 3 in each battery assembly 10 and connecting multiple cold plates 3 of multiple battery assemblies 10 in series, can reduce the area of ​​the cold plate 3 between two adjacent battery assemblies 10, thereby reducing the cost of the cold plates 3 in the battery module 100. Furthermore, it can reduce complex shunt and merging designs, simplify the materials and processes required in the manufacturing process, and help reduce production costs. At the same time, it makes the entire cooling system structure simpler, easier to achieve efficient layout in a limited space, and easier to maintain, facilitating the location and repair of potential fault points.

[0038] In some embodiments of the present invention, such as Figures 9-11 , Figure 14 and Figure 15 As shown, each cold plate 3 has a connecting component 5 at both ends along a third direction, and multiple cold plates 3 are connected in series through the connection between the connecting components 5. Specifically, the connecting component 5 includes a collector 51 and a clamping plate 52. The collector 51 is connected to the cold plate 3 and has a collection channel communicating with the cold plate 3. The clamping plate 52 is stacked and connected to the collector 51 along a second direction. The clamping plate 52 has a first mounting hole 521 communicating with the collection channel. The pipe connecting the cold plate 3 is connected to the clamping plate 52 and communicates with the first mounting hole 521.

[0039] The arrangement of the clamping plate 52 and the current collector 51 along the second direction can make reasonable use of the space of the battery module 100 along the second direction, reduce the space occupied by the connecting component 5 in the third direction, and help reduce the volume of the battery module 100. In a limited space, it is beneficial to improve the energy density of the battery module 100.

[0040] In addition, the connecting assembly 5 includes a separate current collector 51 and a clamping plate 52, which facilitates the connection between the pipeline and the cold plate 3. For example, during the assembly of the battery module 100, the clamping plate 52 can be connected to the pipeline, the cold plate 3 can be connected to the current collector 51, and finally the clamping plate 52 and the current collector 51 can be connected together.

[0041] Optionally, the current collector 51 and the cold plate 3 can be welded together.

[0042] Optionally, the clamping plate 52 and the pipe can be welded together, and the inner diameter of the pipe connected to the first mounting hole 521 is the same as the inner diameter of the end of the first mounting hole 521 closest to the pipe, thereby reducing flow resistance.

[0043] In a specific example of the present invention, such as Figure 3 and Figure 9 As shown, the battery assembly 10 consists of four components arranged along the first direction. Correspondingly, the cold plates 3 also consist of four components arranged along the first direction. The four cold plates 3 along the first direction are designated as the first cold plate 3, the second cold plate 3, the third cold plate 3, and the fourth cold plate 3. The first mounting hole 521 of the connecting component 5 at one end of the first cold plate 3 along the third direction serves as the main inlet and is connected to an inlet pipe 91. The first mounting hole 521 of the connecting component 5 at the end of the first cold plate 3 away from the main inlet is connected to the first mounting hole 521 of the connecting component 5 at the same end of the second cold plate 3 through a first pipe 92. Then, the first mounting hole 521 of the connecting component 5 at the end of the second cold plate 3 away from the first pipe 92 and the first mounting hole 521 of the connecting component 5 at the same end of the third cold plate 3 are connected through the second pipe 93. The first mounting hole 521 of the connecting component 5 at the end of the third cold plate 3 away from the second pipe 93 and the first mounting hole 521 of the connecting component 5 at the same end of the fourth cold plate 3 are connected through the third pipe 94. The first mounting hole 521 of the connecting component 5 at the end of the fourth cold plate 3 away from the third pipe 94 serves as the main outlet and is connected to the outlet pipe 95.

[0044] The first pipe 92, the second pipe 93, and the third pipe 94 are located on the same side of the connecting assembly 5 along the second direction, and at least a portion of the inlet pipe 91 and at least a portion of the outlet pipe 95 are located on the same side of the connecting assembly 5 along the second direction as the first pipe 92.

[0045] Optionally, the first pipe 92, the second pipe 93, the third pipe 94, the inlet pipe 91, and the outlet pipe 95 are made of aluminum.

[0046] Optionally, the current collector 51 and the clamping plate 52 are metal parts.

[0047] In some embodiments of the present invention, reference is made to Figure 12 The first conduit 92, the second conduit 93, and the third conduit 94 each include a first segment 921, a second segment 922, and a third segment 923 connected in sequence. The first segment 921 and the third segment 923 extend along a second direction and one end of each segment is connected to a first mounting hole 521 of a connecting assembly 5. The second segment 922 extends along a first direction. Furthermore, the outer diameter of the second segment 922 is larger than the outer diameters of the first segment 921 and the third segment 923, facilitating the connection of the first segment 921 and the third segment 923 to the first mounting hole 521.

[0048] In some embodiments of the present invention, such as Figure 14 and Figure 15 As shown, the current collector 51 has a second mounting hole 512 communicating with the current collection channel on the side facing the clamping plate 52 along the second direction. The clamping plate 52 has a mounting post 522 that mates with the second mounting hole 512, and a first mounting hole 521 penetrates the mounting post 522. After the current collector 51 and the clamping plate 52 are assembled, the mounting post 522 is located in the second mounting hole 512, and the first mounting hole 521 penetrates the mounting post 522, thereby facilitating the communication between the first mounting hole 521 and the current collection channel.

[0049] Furthermore, such as Figure 14 and Figure 15 As shown, a sealing ring 53 is provided between the mounting post 522 and the inner peripheral wall of the second mounting hole 512. This achieves a seal between the first mounting hole 521 and the second mounting hole 512.

[0050] Furthermore, such as Figure 14 and Figure 15 As shown, a sealing groove 5221 is provided on the outer peripheral wall of the mounting post 522. The sealing groove 5221 extends in a ring shape along the circumferential direction of the mounting post 522, and the sealing ring 53 is located inside the sealing groove 5221.

[0051] In some embodiments of the present invention, such as Figure 9 , Figure 10 , Figure 14 and Figure 15 As shown, the clamping plate 52 and the manifold 51 are connected by fasteners 54. This improves the reliability of the connection between the clamping plate 52 and the manifold 51, and simplifies the connection method between them.

[0052] In a specific example of the present invention, reference is made to... Figure 9 , Figure 10 , Figure 14 and Figure 15The current collector 51 includes a first connecting portion 511 and a second connecting portion 513 arranged and connected along a second direction. The first connecting portion 511 is located on the side of the second connecting portion 513 away from the clamping plate 52. The dimension of the second connecting portion 513 along the second direction is larger than the dimension of the first connecting portion 511 along the second direction, and the dimension of the second connecting portion 513 along the first direction is smaller than the dimension of the first connecting portion 511 along the first direction. The first connecting portion 511 is used to connect with the cold plate 3, and the second connecting portion 513 is used to connect with the clamping plate 52. A second mounting hole 512 is located on the second connecting portion 513, and a third mounting hole 514 for fastener 54 connection is also located on the second connecting portion 513. The second mounting hole 512 and the third mounting hole 514 are spaced apart along the first direction.

[0053] In some embodiments of the present invention, such as Figure 3 and Figure 4 As shown, in the same battery assembly 10, a plurality of cylindrical batteries 11 of the first cylindrical battery pack 1 and a plurality of cylindrical batteries 11 of the second cylindrical battery pack 2 are staggered along the third direction, thereby reducing the size of the battery module 100 in the second direction.

[0054] Furthermore, such as Figure 4 , Figure 5 and Figure 9 As shown, the cold plate 3 includes multiple first protrusions 31 and multiple second protrusions 32. The first protrusions 31 and second protrusions 32 are alternately arranged and connected along a third direction. The first protrusions 31 are arranged opposite to the cylindrical batteries 11 of the first cylindrical battery pack 1 along a second direction and protrude towards the second cylindrical battery pack 2. The second protrusions 32 are arranged opposite to the cylindrical batteries 11 of the second cylindrical battery pack 2 along a second direction and protrude towards the first cylindrical battery pack 1. It is understood that the cold plate 3 can be formed in a serpentine or wavy shape. The first protrusions 31 can increase the contact area between the cold plate 3 and the cylindrical batteries 11 in the first cylindrical battery pack 1, thereby improving the cooling or heating effect on the cylindrical batteries 11 in the first cylindrical battery pack 1. The second protrusions 32 can increase the contact area between the cold plate 3 and the cylindrical batteries 11 in the second cylindrical battery pack 2, thereby improving the cooling or heating effect on the cylindrical batteries 11 in the second cylindrical battery pack 2. Furthermore, the system has a low voltage drop and excellent performance.

[0055] The first thermally conductive adhesive 7 is disposed between the first protrusion 31 and the cylindrical battery 11 of the first cylindrical battery pack 1. The first thermally conductive adhesive 7 is bonded and connected to the cold plate 3 and the cylindrical battery 11 of the first cylindrical battery pack 1. On the projection plane perpendicular to the first direction, both the first protrusion 31 and the first thermally conductive adhesive 7 are arc-shaped protrusions towards the side of the second cylindrical battery pack 2. The second thermally conductive adhesive 8 is disposed between the second protrusion 32 and the cylindrical battery 11 of the second cylindrical battery pack 2. The second thermally conductive adhesive 8 is bonded and connected to the cylindrical battery 11 of the second cylindrical battery pack 2. On the projection plane perpendicular to the first direction, both the second protrusion 32 and the second thermally conductive adhesive 8 are arc-shaped protrusions towards the side of the first cylindrical battery pack 1.

[0056] In some embodiments of the present invention, such as Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the second direction is the vertical direction. The second cylindrical battery pack 2 is located below the first cylindrical battery pack 1, and a heating film 6 is provided on the side of the cold plate 3 facing the second cylindrical battery pack 2. The heating film 6 may include a first insulating film and a second insulating film stacked together, with a resistance wire between the first insulating film and the second insulating film. The heating film 6 can play a heating role. In cold winters, the cylindrical batteries 11 in the first cylindrical battery pack 1 and the second cylindrical battery pack 2 can be heated through the heating film 6 to ensure the reliability of battery operation and battery life. In addition, the combination of the heating film 6 and the cold plate 3 can improve the cooling and heating performance of the direct cooling system and reduce thermal management costs.

[0057] The heating film 6 is attached to the surface of the cold plate 3 facing the second cylindrical battery pack 2. The heating film 6 and the cold plate 3 are arranged in a conformal manner. The heating film 6 can also be serpentine or wavy.

[0058] When the battery module 100 is used within the battery pack 1000 and the second cylindrical battery pack 2 is located below the first cylindrical battery pack 1, i.e., the second direction is the vertical direction, the cylindrical battery 11 is laid flat, and one side of the second cylindrical battery pack 2 is the low-temperature cold side. This can be achieved by having a heating film 6 only on the side of the cold plate 3 facing the second cylindrical battery 11, which provides better temperature uniformity and ensures the temperature uniformity of the upper and lower layers of the first cylindrical battery pack 1 and the second cylindrical battery pack 2. Simultaneously, having a heating film 6 on only one side reduces costs. In this case, the second thermally conductive adhesive 8 is placed between the heating film 6 and the cylindrical battery 11 of the second cylindrical battery pack 2.

[0059] Of course, the present invention is not limited to this. A heating film 6 may also be provided on the side of the cold plate 3 facing the first cylindrical battery pack 1.

[0060] In some embodiments of the present invention, along the first direction, the size of the cold plate 3 is smaller than the size of the cylindrical battery 11, and the size of the heating film 6 is less than or equal to the size of the cold plate 3. In a projection plane perpendicular to the second direction, the projection of the heating film 6 is located within the projection of the cold plate 3. This can further reduce the cost of the cold plate 3 and the heating film 6.

[0061] In some embodiments of the present invention, along the third direction, the heating power at both ends of the heating film 6 is higher than the heating power in the middle region of the heating film 6. When the battery module 100 is applied to the battery pack 1000, and when the second direction is the vertical direction, the cylindrical batteries 11 located at both ends of the third direction are relatively closer to the outer side of the battery pack 1000, and are relatively located on the low-temperature side. Under low-temperature conditions, the heat conduction efficiency is faster. This makes the heating power at both ends of the heating film 6 along the third direction higher than the heating power in the middle region of the heating film 6, which allows for better heating of the cylindrical batteries 11 located at both ends of the third direction under low-temperature conditions, thereby improving the performance of the battery pack 1000.

[0062] In particular, along the third direction, from the center to both ends of the heating film 6, the heating power of the heating film 6 can be gradually increased.

[0063] Of course, the present invention is not limited thereto. Along a third direction, the heating film 6 can be divided into a middle region and end regions located on both sides of the middle region. In the middle region, the heating power of the heating film 6 remains unchanged, and in the end regions, the heating power of the heating film 6 remains unchanged, but the heating power of the end regions is greater than that of the middle region. Along a third direction, the dimensions of the middle region and the individual end regions can be the same, or the dimension of the middle region can be greater than the dimension of the individual end region, and the dimensions of the two end regions can be the same.

[0064] In a specific example of the present invention, along a third direction, the heating power of the heating film 6 in the region opposite to the four outermost cylindrical batteries 11 of the first cylindrical battery pack 1 and the second cylindrical battery pack 2 is Z, and the heating power of the remaining regions is X, satisfying: 1.4X≤Z≤1.6X. This increases the heating power of the heating film 6 only in the regions opposite to the two cylindrical batteries 11 at both ends of the first cylindrical battery pack 1 and the two cylindrical batteries 11 at both ends of the second cylindrical battery pack 2. This satisfies the heating requirements of the outermost cylindrical batteries 11 while avoiding the risk of the heating film 6 burning out due to excessive heating power in other regions.

[0065] In this context, along the third direction, the heating power Z of the area opposite the heating film 6 to the four outermost cylindrical batteries 11 of the first cylindrical battery pack 1 and the second cylindrical battery pack 2 can be 1.4X, 1.5X or 1.6X, etc.

[0066] It should be noted that the four outermost cylindrical batteries 11 of the first cylindrical battery pack 1 and the second cylindrical battery pack 2 refer to the two batteries at both ends of the first cylindrical battery pack 1 and the two batteries at both ends of the second cylindrical battery pack 2.

[0067] In some embodiments of the present invention, among two adjacent first protrusions 31 and second protrusions 32, the heating power of the heating film 6 in the region opposite to the first protrusion 31 is A, and the heating power of the heating film 6 in the region opposite to the second protrusion 32 is B, satisfying: 1.1B≤A≤1.2B. Since the heating film 6 is located on the side of the cold plate 3 facing the second cylindrical battery pack 2, the heating film 6 can directly heat the cylindrical battery 11 in the second cylindrical battery pack 2. For the cylindrical battery 11 in the first cylindrical battery pack 1, the cold plate 3 needs to be heated first by the heating film 6, and then the cylindrical battery 11 in the first cylindrical battery pack 1 needs to be heated by the heated cold plate 3. Therefore, the heating efficiency of the heating film 6 on the cylindrical battery 11 in the first cylindrical battery pack 1 is relatively slower than that on the cylindrical battery 11 in the second cylindrical battery pack 2.

[0068] In this application, the heating power A of the heating film 6 in the region opposite to the first protrusion 31 and the heating power B of the heating film 6 in the region opposite to the second protrusion 32 are such that 1.1B≤A≤1.2B. That is, the heating power of the heating film 6 in the region opposite to the first protrusion 31 is greater than the heating power of the heating film 6 in the region opposite to the second protrusion 32, which makes the heating effect of the heating film 6 on the first cylindrical battery pack 1 and the second cylindrical battery pack 2 more uniform.

[0069] Among the two adjacent first protrusions 31 and second protrusions 32, the heating power A of the heating film 6 in the region opposite to the first protrusion 31 can be 1.1B, 1.15B or 1.2B.

[0070] In this application, by making the heating power of the heating film 6 relative to the four outermost cylindrical batteries 11 of the first cylindrical battery pack 1 and the second cylindrical battery pack 2 along a third direction Z, and the heating power of the remaining areas X, and satisfying: 1.4X≤Z≤1.6X, and in the two adjacent first protrusions 31 and second protrusions 32, the heating power of the heating film 6 relative to the first protrusion 31 is A, and the heating power of the heating film 6 relative to the second protrusion 32 is B, and satisfying: 1.1B≤A≤1.2B, the temperature difference of the cylindrical batteries 11 can be optimized, so that the low-temperature heating temperature difference performance can be controlled within 5℃, and the temperature rise rate can meet more than 0.8℃ / min, while avoiding the risk of the heating film 6 burning out due to excessive power.

[0071] In some embodiments of the present invention, such as Figure 12 and Figure 13As shown, the cold plate 3 has multiple flow channels 33 spaced apart along a first direction, and a dividing rib 34 is provided between two adjacent flow channels 33. This allows multiple flow channels 33 to be formed within the cold plate 3, improving the heat exchange efficiency of the cold plate 3 and the thermal conductivity to the heating film 6, thereby increasing the heat exchange efficiency of the heating film 6, improving the direct cooling heat exchange performance of the cold plate 3 and the heat exchange power of the heating film 6, and reducing system costs.

[0072] In some embodiments of the present invention, such as Figure 12 and Figure 13 As shown, along the second direction, the thickness of the cold plate 3 is 'a', and it satisfies: 2mm ≤ a ≤ 5mm. When the thickness of the cold plate 3 is greater than 5mm, its volume is large, which is not conducive to the miniaturization of the battery module 100. When the thickness of the cold plate 3 is less than 2mm, the cross-sectional area of ​​the flow channel 33 inside the cold plate 3 is small, the flow rate of the cooling medium is small, and the heat exchange effect of the cold plate 3 is poor. In this application, the thickness of the cold plate 3 is 'a' along the second direction, which not only helps to reduce the volume of the cold plate 3 and improve the energy density of the battery module 100 within a certain volume, but also effectively ensures the cross-sectional area of ​​the flow channel 33 and the flow rate of the cooling medium, thus improving the heat exchange efficiency of the cold plate 3.

[0073] For example, along the second direction, the dimension a of the cold plate 3 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0074] In some embodiments of the present invention, such as Figure 12 and Figure 13 As shown, the dimension of the flow channel 33 is b along the first direction, and the thickness of the cold plate 3 is a along the second direction, satisfying a / 3 ≤ b ≤ a / 2. When b is greater than a / 2, the dimension of the flow channel 33 along the first direction is large, the cooling medium flow rate is low, and overheating is likely to occur at the end cylindrical battery 11, affecting the temperature difference performance of the entire battery module 100. When b is less than a / 3, the cooling medium flow rate is high, and the heat exchange effect is poor. In this application, the dimension b of the flow channel 33 along the first direction and the thickness a of the cold plate 3 along the second direction satisfy a / 3 ≤ b ≤ a / 2, which can ensure the flow rate of the cooling medium and the heat exchange efficiency, and prevent overheating at the end cylindrical battery 11 in the structure of multiple cold plates 3 connected in series, thus preventing the temperature difference performance of the entire battery module 100 from being affected.

[0075] For example, b can be a / 3, 5a / 12, or a / 2, etc.

[0076] In some embodiments of the present invention, such as Figure 12 and Figure 13As shown, along the first direction, the dimension of the flow channel 33 is b, and the dimension of the dividing rib 34 is c, satisfying: 2b / 3≤c≤b. Therefore, by controlling the dimension of the dividing rib 34, the flow rate of the cooling medium and the heat exchange efficiency can be guaranteed, preventing overheating at the end cylindrical cavity in the structure of multiple cold plates 3 connected in series, thus affecting the temperature difference performance of the entire battery module 100. Simultaneously, since the heating film 6 is arranged on the side close to the second cylindrical battery pack 2, the cylindrical battery 11 of the first cylindrical battery pack 1 requires indirect heat transfer from the cold plate 3 to the cylindrical battery 11, increasing the thermal resistance. Designing the dimension of the dividing rib 34 can accelerate the heat conduction effect of the cold plate 3.

[0077] For example, c can be 2b / 3, 5b / 6, or b, etc.

[0078] In some embodiments of the present invention, the wall thickness of the flow channel 33 along the second direction is d, and satisfies: a / 4≤d≤a / 2. When the wall thickness d of the flow channel 33 is greater than a / 2, the dimension of the flow channel 33 along the second direction is smaller, the flow rate of the cooling medium in the flow channel 33 is faster, and the heat exchange effect of the cold plate 3 is poor. When the wall thickness d of the flow channel 33 is less than a / 4, the wall thickness of the cold plate 3 is smaller, the structural strength of the cold plate 3 is poorer, and the dimension of the flow channel 33 along the second direction is larger, the flow rate of the cooling medium in the flow channel 33 is slower, which can easily lead to overheating at the end cylindrical battery 11, affecting the temperature difference performance of the entire battery module 100.

[0079] In this application, by setting the above dimensions, the heat exchange efficiency between the cold plate 3 and the cylindrical battery 11 can be improved, the heating performance can be enhanced, the structural strength can be increased, and the cost can be significantly reduced. By reasonably setting the dimensions of the cold plate 3 and the power of the heating film 6, the temperature consistency of the first cylindrical battery pack 1 and the second cylindrical battery pack 2 can be guaranteed.

[0080] In some embodiments of the present invention, two cylindrical battery packs and one cold plate 3 are present in the same battery assembly 10. This allows for a reduction in the size of the battery module 100 along the second direction while still meeting the requirements of the battery module 100. When the battery module 100 is applied to the battery pack 1000 and the battery pack 1000 is applied to a vehicle, it facilitates the placement of the battery pack 1000 under the vehicle chassis, thus facilitating vehicle movement.

[0081] Of course, the present invention is not limited to this. In the same battery assembly 10, there can be more cylindrical battery packs, such as three, four, five or six, etc.

[0082] The following describes a battery pack 1000 according to an embodiment of the present invention.

[0083] like Figure 1 and Figure 2 As shown, the battery pack 1000 according to an embodiment of the present invention includes a housing 200 and the battery module 100 described above.

[0084] Specifically, the battery module 100 is housed within the housing 200, with the second direction being vertical. The second cylindrical battery pack 2 is located below the first cylindrical battery pack 1. This allows the cylindrical batteries 11 to be laid flat, thereby saving space in the vertical direction of the battery pack 1000 and reducing the overall size of the battery pack 1000 in that direction.

[0085] According to an embodiment of the present invention, the battery pack 1000, by setting the aforementioned battery module 100, provides a separate cold plate 3 in each battery assembly 10, and connects multiple cold plates 3 of multiple battery assemblies 10 in series, which can reduce the area of ​​the cold plate 3 between two adjacent battery assemblies 10, thereby reducing the cost of the cold plate 3 of the battery module 100. Furthermore, it can reduce complex shunt and merging designs, simplify the materials and processes required in the manufacturing process, and help reduce production costs. At the same time, it makes the entire cooling system structure simpler, easier to achieve efficient layout in a limited space, and easier to maintain, facilitating the location and repair of potential fault points.

[0086] The following describes an electrical device according to an embodiment of the present invention.

[0087] The electrical device according to an embodiment of the present invention includes the battery pack 1000 described above.

[0088] According to the embodiments of the present invention, the electrical device, by providing the aforementioned battery pack 1000, including the aforementioned battery module 100, and by providing a separate cold plate 3 in each battery component 10, and by connecting multiple cold plates 3 of multiple battery components 10 in series, can reduce the area of ​​the cold plate 3 between two adjacent battery components 10, thereby reducing the cost of the cold plate 3 of the battery module 100. Furthermore, it can reduce complex shunt and merging designs, simplify the materials and processes required in the manufacturing process, and help reduce production costs. Simultaneously, it makes the entire cooling system structure simpler, facilitates efficient layout within a limited space, and is easy to maintain, making it easy to locate and repair potential fault points.

[0089] Among them, electrical devices can be vehicles, aircraft, water equipment, or household appliances, etc.

[0090] Other configurations and operations of the electrical device and battery pack 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0091] 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 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.

[0092] Although embodiments of the 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 invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that, include: Multiple battery modules (10) are arranged along a first direction. Each battery module (10) includes multiple cylindrical battery packs arranged along a second direction. Each cylindrical battery pack includes multiple cylindrical batteries (11) arranged along a third direction. The axis of the cylindrical battery (11) extends along the first direction. Along the second direction, a cold plate (3) is provided between any two adjacent cylindrical battery packs. The multiple cold plates (3) of the multiple battery modules (10) are spaced apart and connected in series. The first direction, the second direction and the third direction are perpendicular to each other.

2. The battery module according to claim 1, characterized in that, Each of the cold plates (3) is provided with connecting components (5) at both ends along the third direction, the connecting components (5) including: A current collector (51) is connected to the cold plate (3) and has a current collection channel communicating with the cold plate (3); A clamping plate (52) is stacked and connected to the collector (51) along the second direction. The clamping plate (52) has a first mounting hole (521) that communicates with the collector channel. The pipe connecting the cold plate (3) is connected to the clamping plate (52) and communicates with the first mounting hole (521).

3. The battery module according to claim 2, characterized in that, The current collector (51) has a second mounting hole (512) communicating with the current collection channel on the side facing the clamping plate (52). The clamping plate (52) has a mounting post (522) that cooperates with the second mounting hole (512). The first mounting hole (521) passes through the mounting post (522).

4. The battery module according to claim 3, characterized in that, A sealing ring (53) is provided between the mounting post (522) and the inner peripheral wall of the second mounting hole (512).

5. The battery module according to claim 2, characterized in that, The clamping plate (52) is connected to the current collector (51) by fasteners (54).

6. The battery module according to claim 1, characterized in that, Two adjacent cylindrical battery packs along the second direction are defined as a first cylindrical battery pack (1) and a second cylindrical battery pack (2). In the same battery assembly (10), a plurality of cylindrical batteries (11) of the first cylindrical battery pack (1) and a plurality of cylindrical batteries (11) of the second cylindrical battery pack (2) are staggered along the third direction. The cold plate (3) includes a plurality of first protrusions (31) and a plurality of second protrusions (32). The plurality of first protrusions (31) and the plurality of second protrusions (32) are alternately arranged and connected along the third direction. The first protrusions (31) are arranged opposite to the cylindrical battery (11) of the first cylindrical battery pack (1) along the second direction and protrude toward the direction of the second cylindrical battery pack (2). The second protrusions (32) are arranged opposite to the cylindrical battery (11) of the second cylindrical battery pack (2) along the second direction and protrude toward the direction of the first cylindrical battery pack (1).

7. The battery module according to claim 6, characterized in that, The second direction is the up-down direction. The second cylindrical battery pack (2) is located below the first cylindrical battery pack (1). The cold plate (3) is provided with a heating film (6) on the side facing the second cylindrical battery pack (2).

8. The battery module according to claim 7, characterized in that, Along the third direction, the heating power at both ends of the heating film (6) is higher than the heating power in the middle region of the heating film (6).

9. The battery module according to claim 8, characterized in that, Along the third direction, the heating power of the heating film (6) relative to the four outermost cylindrical batteries (11) of the first cylindrical battery pack (1) and the second cylindrical battery pack (2) is Z, and the heating power of the remaining areas is X, and satisfies: 1.4X≤Z≤1.6X.

10. The battery module according to claim 7, characterized in that, In the two adjacent first protrusions (31) and second protrusions (32), the heating power of the heating film (6) in the region opposite to the first protrusion (31) is A, and the heating power of the heating film (6) in the region opposite to the second protrusion (32) is B, and satisfies: 1.1B≤A≤1.2B.

11. The battery module according to any one of claims 1-10, characterized in that, The cold plate (3) has a plurality of flow channels (33) spaced apart along the first direction, and there are dividing ribs (34) between two adjacent flow channels (33).

12. The battery module according to claim 11, characterized in that, Along the second direction, the thickness of the cold plate (3) is a, and satisfies: 2mm≤a≤5mm; And / or, along the first direction, the dimension of the flow channel (33) is b, and along the second direction, the thickness of the cold plate (3) is a, and satisfies: a / 3≤b≤a / 2; And / or, along the first direction, the dimension of the flow channel (33) is b, the dimension of the dividing rib (34) is c, and satisfies: 2b / 3≤c≤b; And / or, along the second direction, the wall thickness of the flow channel (33) is d, and satisfies: a / 4≤d≤a / 2.

13. The battery module according to any one of claims 1-10, characterized in that, In the same battery assembly (10), there are two cylindrical battery packs and one cold plate (3).

14. A battery pack, characterized in that, include: Box (200) ； The battery module (100) according to any one of claims 1-13 is located inside the housing (200).

15. An electrical appliance, characterized in that, Includes the battery pack according to claim 14.

Images