Battery module, module including ring-shaped batteries, and electrical equipment

Abstract

The present application discloses a battery module, a module including annular batteries, and an electrical device. The battery module includes single batteries, and heat dissipation holes are provided in the middle of the single batteries; a cooling unit, including a first cooling flow channel, wherein the first cooling flow channel is formed in the heat dissipation holes for dissipating heat from the middle of the single batteries. By providing heat dissipation holes in the middle of the single batteries and arranging the first cooling flow channel in the heat dissipation holes to dissipate heat from the middle of the single batteries, the heat dissipation performance is improved. On the basis of the improved heat dissipation performance, the battery size can be further increased. In addition, the temperature of the battery will not be too high due to poor heat dissipation, enabling the battery to operate in a relatively ideal temperature environment, with high activity of the active substances in the battery, so the electrical performance of the battery can be improved. Moreover, since the battery does not have the problem of overheating, the problem of the battery catching fire or even exploding due to high temperature is avoided. Therefore, the safety performance is improved.

Description

Technical Field

[0001] The present invention generally relates to the technical field of batteries, and particularly relates to a battery module, a module including annular batteries, and an electrical device. Background Art

[0002] Lithium-ion batteries have the advantages of light weight, high energy density, long cycle life, high safety performance, etc., and have become the mainstream batteries.

[0003] The main forms of lithium-ion batteries are square shell batteries, cylindrical batteries, and soft-pack batteries. For cylindrical batteries, they have high processing automation, high production efficiency, good consistency, and relatively low cost.

[0004] Currently, cylindrical batteries basically adopt a fully closed structure. As the energy density and power density of lithium-ion batteries are getting higher and higher, the charge and discharge rate is also getting larger, and the heat generation rate of the battery also increases accordingly. However, due to the poor radial heat conduction performance of cylindrical batteries, the battery size is limited, and the electrical performance and safety performance of the battery are reduced. Summary of the Invention

[0005] This application expects to provide a battery module, a module including annular batteries, and an electrical device, at least for improving the heat dissipation performance of the battery.

[0006] In a first aspect, the present invention provides a battery module, including:

[0007] Single cells, with heat dissipation holes provided in the middle of the single cells;

[0008] A cooling unit, including a first cooling flow channel, and the first cooling flow channel is formed in the heat dissipation hole for dissipating heat from the middle of the single cells.

[0009] As an implementable manner, the heat dissipation hole is a blind hole, and at least one partition is provided in the blind hole, and the partition divides the blind hole into sub-flow channels connected end to end in sequence, and the sub-flow channels connected end to end in sequence form the first cooling flow channel.

[0010] As an implementable manner, at least one through hole penetrating the partition is provided on the partition.

[0011] As an implementable manner, the through hole is a strip-shaped hole, and the length extension direction of the strip-shaped hole is parallel to the axis of the heat dissipation hole.

[0012] As an implementable manner, the heat dissipation hole is a through hole, and the through hole constitutes the first cooling flow channel.

[0013] As an implementable manner, the battery module further includes a second cooling channel and a third cooling channel. The second cooling channel and the third cooling channel are respectively disposed at two ends of the single battery. One end of the through hole communicates with the second cooling channel, and the other end communicates with the third cooling channel.

[0014] As an implementable manner, the first cooling channel includes a first cooling pipe independent of the single battery. The first cooling pipe passes through the heat dissipation holes and is in heat exchange cooperation with the heat dissipation holes.

[0015] As an implementable manner, heat dissipation protrusions are provided on the inner wall of the heat dissipation holes. The heat dissipation protrusions are in contact with the outer side surface of the first cooling pipe.

[0016] As an implementable manner, the battery module includes a plurality of single batteries arranged in an array, and the first cooling pipes are respectively arranged in the heat dissipation holes of the single batteries in a one-to-one correspondence.

[0017] As an implementable manner, the battery module further includes a second cooling channel and a third cooling channel. The second cooling channel and the third cooling channel are respectively disposed at two ends of the single battery. One end of the first cooling pipe communicates with the second cooling channel, and the other end communicates with the third cooling channel.

[0018] As an implementable manner, the battery module includes at least two single batteries. The adjacent single batteries are coaxially arranged. The heat dissipation holes are through holes, and the through holes of the adjacent single batteries communicate with each other to form the first cooling channel; or,

[0019] The first cooling channel includes a first cooling pipe independent of each single battery. The first cooling pipe passes through the through holes of the coaxially arranged single batteries.

[0020] As an implementable manner, the battery module further includes a second cooling channel and a third cooling channel. The second cooling channel and the third cooling channel are respectively disposed at the ends of the two outer single batteries; One end of the first cooling channel communicates with the second cooling channel, and the other end communicates with the third cooling channel.

[0021] As an implementable manner, one of the second cooling channel and the third cooling channel is provided with a water inlet, and the other is provided with a water outlet.

[0022] As an implementable manner, in the second cooling channel and the third cooling channel, one is at least used to cool the bottom of the single battery, and the other is at least used to cool the top of the single battery.

[0023] As an implementable mode, at least one of the at least second cooling channel and the third cooling channel includes at least two independent sub-cooling channels, and at least one of the at least two sub-cooling channels communicates with the first cooling channel.

[0024] As an implementable mode, first confluence parts are connected to both ends of some of the sub-cooling channels, second confluence parts are connected to both ends of the remaining sub-cooling channels, a circulation pipeline is connected between the first confluence part and the second confluence part on the same side, and a circulation pump and a heat exchanger are arranged in one of the circulation pipelines.

[0025] As an implementable mode, the cooling unit further includes a fourth cooling channel, and at least a part of the fourth cooling channel is arranged outside the side wall of the single cell, at least for dissipating heat from the outer side wall of the single cell.

[0026] As an implementable mode, the battery module further includes a housing, and the single cell is arranged in the housing;

[0027] A second cooling pipe is arranged between the side wall of the single cell and the inner wall of the housing, and the second cooling pipe at least serves as a part of the fourth cooling channel;

[0028] Alternatively, the fourth cooling channel is arranged in the side wall of the housing, and the side wall of the housing conforms to the single cell.

[0029] As an implementable mode, the single cell is a columnar battery.

[0030] In a second aspect, the present invention provides a module including a ring-shaped battery, the module includes the above-mentioned battery module, and the ring-shaped battery includes the single cell.

[0031] As an implementable mode, the ring-shaped battery includes a battery housing, the battery housing includes an outer peripheral wall and a core shaft penetrating through the outer peripheral wall, and heat dissipation holes are arranged on the core shaft, and the heat dissipation holes extend along the axis of the core shaft.

[0032] As an implementable mode, the maximum value of the straight-line distance between any two points on the cross-section of the heat dissipation hole is 0.11-0.65 of the maximum value of the straight-line distance between any two points on the cross-section of the outer peripheral wall.

[0033] As an implementable mode, the ring-shaped battery further includes a ring-shaped battery core, and the ring-shaped battery core is sleeved outside the core shaft.

[0034] As an implementable mode, a plurality of heat dissipation protrusions are arranged on the hole wall of the heat dissipation hole.

[0035] As an implementable manner, one end of the heat dissipation hole is closed and the other end is open; or, both ends of the heat dissipation hole are open.

[0036] As an implementable manner, the outer peripheral wall and the mandrel enclose a cavity for accommodating the annular battery cell, and the cross-sectional shape of the cavity is annular.

[0037] In a third aspect, the present invention provides an electrical device, including the above battery module; or, including the above module containing an annular battery.

[0038] In the above solution, by providing a heat dissipation hole in the middle of the single battery cell, and a first cooling flow channel is formed in the heat dissipation hole to dissipate heat from the middle of the single battery cell. Compared with dissipating heat only from the outer peripheral surface of the battery, the heat dissipation performance is improved. On the basis of the improved heat dissipation performance, the battery size can be further increased. In addition, the temperature of the battery will not be too high due to poor heat dissipation, so that the battery can work in a relatively ideal temperature environment, and the activity of the active substances in the battery is high. Therefore, the electrical performance of the battery can be improved; moreover, since the battery does not have the problem of high temperature, the problem of battery combustion or even explosion caused by high temperature is avoided. Therefore, the safety performance is improved. Description of the Drawings

[0039] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present application will become more obvious:

[0040] Figure 1 It is a schematic structural diagram of the battery module provided by the embodiment of the present invention;

[0041] Figure 2 It is a schematic structural diagram of the separator provided by the embodiment of the present invention;

[0042] Figure 3 It is a schematic structural diagram of the battery module provided by another embodiment of the present invention;

[0043] Figure 4 It is a schematic structural diagram of the battery module provided by still another embodiment of the present invention;

[0044] Figure 5 It is a top view of the battery module provided by another embodiment of the present invention;

[0045] Figure 6 For Figure 5 front view;

[0046] Figure 7 It is a schematic bottom structure diagram of the battery module provided by the embodiment of the present invention;

[0047] Figures 8 - 11Schematic diagram of the bottom structure of the housing of the battery module provided by the embodiment of the present invention respectively;

[0048] Figure 12 Stereogram of the battery housing provided by the embodiment of the present invention;

[0049] Figure 13 Top view of the ring-shaped battery provided by the embodiment of the present invention;

[0050] Figure 14 is Figure 13 A-A cross-sectional view of;

[0051] Figure 15 Cross-sectional view of the ring-shaped battery corresponding to the Figure 13 A-A position provided by another embodiment of the present invention;

[0052] Figure 16 Cross-sectional view of the ring-shaped battery corresponding to the Figure 13 A-A position provided by another embodiment of the present invention;

[0053] Figure 17 Cross-sectional view of the ring-shaped battery corresponding to the Figure 13 A-A position provided by another embodiment of the present invention.

[0054] Explanation of reference numerals:

[0055] Single battery 1, heat dissipation hole 2, heat dissipation protrusion 21, first cooling channel 3, partition 4, circulation hole 41, second cooling channel 5, third cooling channel 6, fourth cooling channel 7, circulation pipeline 8, housing 9, sub-cooling channel 10, partition plate 11, battery housing 12, core shaft 122, outer peripheral wall 123, ring-shaped battery core 13, maximum linear distances D1, D2. Detailed implementation manners

[0056] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0057] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0058] As Figure 1 shown, the battery module provided by the embodiment of the present invention includes:

[0059] Single battery 1, and a heat dissipation hole 2 is provided in the middle of the single battery 1;

[0060] The number of single cells 1 can be determined according to the capacity of the battery module. The single cells 1 in the battery module can be connected in series, in parallel, or in a combination of series and parallel. Specifically, which connection method to adopt can be determined according to the capacity of the battery module and the output voltage, etc.

[0061] The single cell 1 is a columnar battery, and the outer shape of the columnar battery can be a cylinder, a rectangular column, a polygonal column, etc.

[0062] As a preferred implementation, the axis of the heat dissipation hole 2 can be collinear or parallel with the axis of the single cell 1. This structure is convenient for processing and manufacturing. For example, when winding a bare battery cell, a hole is directly left in the central part of the bare battery cell, that is, the obtained bare battery cell after winding is in an annular structure. Correspondingly, the housing of the single cell 1 includes an inner wall and an outer wall. Among them, the inner wall is used to enclose the heat dissipation hole 2; a receiving space for the bare battery cell is formed between the inner wall and the outer wall, and the bare battery cell is located in this receiving space. And the inner wall is inserted into the hole in the central part of the bare battery cell. It can be understood that it can also be that the housing of the single cell 1 only includes the outer wall, and at the same time the single cell 1 also includes a hollow through metal tube, and the metal tube can be fixedly connected to the bottom of the housing. At this time, a receiving space for the bare battery cell is formed between the metal tube and the housing. And the metal tube is inserted into the hole in the central part of the bare battery cell.

[0063] The housing can be made of an aluminum housing or a steel housing, etc.

[0064] The single cell 1 can adopt a structure with the pole tabs on the same side, that is, the positive and negative pole tabs are located at the same end of the single cell 1; it can also adopt a structure with the pole tabs on the opposite sides, that is, the positive and negative pole tabs are placed at both ends of the single cell 1.

[0065] The cooling unit includes a first cooling flow channel 3, and the first cooling flow channel 3 is formed in the heat dissipation hole 2 for dissipating heat from the middle part of the single cell 1.

[0066] The heat dissipation hole 2 can be a blind hole or a through hole, and the following will be described with different examples.

[0067] Among them, a cooling medium is used to flow into the first cooling flow channel 3. Among them, at least Figure 1 The direction of the arrow in the figure is the flow direction of the cooling medium. The cooling medium is, for example but not limited to, a liquid medium. The cooling medium flows in the first cooling flow channel 3 and exchanges heat with at least the inner side wall described above to take away the heat from the middle part of the single cell 1.

[0068] Among them, the first cooling flow channel 3 can be a medium flow channel formed by a separately arranged pipeline, or a medium flow channel formed at least by means of the inner side wall described above. No matter what structure is adopted, as long as the cooling medium can flow into and out of the single cell 1.

[0069] In the above solution, a heat dissipation hole 2 is provided in the middle of the single cell 1, and the first cooling channel 3 is formed in the heat dissipation hole 2 to dissipate heat from the middle of the single cell 1. Compared with dissipating heat only through the outer peripheral surface of the battery, the heat dissipation performance is improved. On the basis of the improved heat dissipation performance, the battery size can be further increased. In addition, the temperature of the battery will not be too high due to poor heat dissipation, so that the battery can work in a relatively ideal temperature environment, and the activity of the active substances in the battery is high. Therefore, the electrical performance of the battery can be improved. Moreover, since the battery will not have the problem of high temperature, the problem of battery combustion or even explosion caused by high temperature is avoided. Therefore, the safety performance is improved.

[0070] As an implementable manner, as Figure 1 shown, the heat dissipation hole 2 is a blind hole, and at least one partition 4 is provided in the blind hole. The partition 4 divides the blind hole into sub-channels that are sequentially connected end to end, and the sub-channels that are sequentially connected end to end form the first cooling channel 3.

[0071] Among them, the above inner layer wall itself can be closed at one end and open at the other end to form a heat dissipation hole 2 in the form of a blind hole; in other examples, the above inner layer wall itself can be open at both ends, and one end of it is closed by other external components. For example, one end of it is closed by a battery end cover to form a heat dissipation hole 2 in the form of a blind hole.

[0072] By providing the partition 4 in the blind hole that serves as the heat dissipation hole 2, the blind hole is divided into sub-channels that are sequentially connected end to end, which can also be called a maze channel. This can extend the flow time of the cooling medium in the blind hole, so that the cooling medium can fully absorb the heat dissipated from the middle of the single cell 1 from the blind hole, thereby improving the heat exchange performance and reducing the temperature in the middle of the single cell 1.

[0073] The number of partitions 4 can be set according to actual needs. The more partitions 4 are set, the longer the length of the formed maze channel. By setting an appropriate number of partitions 4, the length and caliber of the maze channel can be balanced to meet the flow rate and flow volume of the cooling medium required for dissipating heat from the above blind hole.

[0074] As an implementable manner, also at least refer to Figure 2 shown, at least one flow hole 41 penetrating the partition 4 is provided on the partition 4.

[0075] In some cases, such as but not limited to, the single cell 1 is in a vertical state, and the opening of the blind hole faces downward. The blind hole is divided into a labyrinth flow channel by the partition plate 4. At the position where the labyrinth flow channel turns at the top, there is a possibility of gas accumulation. When gas accumulates at this place, it will slow down the flow rate of the cooling medium and reduce the flow rate of the cooling medium, resulting in a decrease in the cooling capacity. To solve this problem, a through hole 41 is provided on the partition plate 4. Even if gas accumulates at the position where the labyrinth flow channel turns at the top, the cooling medium can still flow through the through hole 41, reducing or overcoming the adverse effects of gas accumulation on the flow of the cooling medium.

[0076] As an implementable manner, the through hole 41 is a strip-shaped hole, and the length extension direction of the strip-shaped hole is parallel to the axis of the heat dissipation hole 2.

[0077] The partition plate 4 is, for example but not limited to, a flat plate structure. Of course, in other examples, plates with other structural forms can also be used, such as corrugated plates, etc.

[0078] By setting the through hole 41 as a strip-shaped hole and the length extension direction of the strip-shaped hole being parallel to the axis of the heat dissipation hole 2, that is to say, the through hole 41 can cover a relatively large range in the depth direction of the heat dissipation hole 2. Even if, as described above, gas accumulates at the position where the labyrinth flow channel turns at the top, the cooling medium can still flow through the lower part of the through hole 41, ensuring the normal flow of the cooling medium to dissipate heat at least at the position of the blind hole.

[0079] As an implementable manner, a plurality of the through holes 41 are uniformly arranged on the partition plate 4.

[0080] By uniformly arranging a plurality of through holes 41 on the partition plate 4, when the cooling medium passes through the partition plate 4, the liquid pressure at each place is relatively balanced. Moreover, by uniformly arranging a plurality of through holes 41, the flow equalizing effect can also be achieved, making the cooling medium flowing at different positions relatively average. Correspondingly, the cooling effect on the inside of the blind hole is also relatively uniform, and further, the temperature at the central part of the single cell 1 is also relatively balanced, avoiding the problem of performance degradation of the battery caused by large temperature difference at the central part of the single cell 1.

[0081] In addition, it should be noted that in Figure 1 the example shown, the opening of the heat dissipation hole 2 of the blind hole structure is located below, and the blind end is located above; in other examples, a structure opposite to Figure 1 this can be adopted, that is, the opening of the heat dissipation hole 2 of the blind hole structure is located above, and the blind end is located below. By adopting this structure, the cooling medium enters and exits the single cell 1 from the upper part of the single cell 1, so when the cooling medium flows in the first cooling flow channel 3, the pressure is relatively small, which can alleviate the problem of insufficient pressure caused by the too long path that the first cooling flow channel 3 flows through.

[0082] As an implementable manner, the heat dissipation holes 2 may be through holes, and the through holes form the first cooling channel 3. It should be noted that when the through holes form the first cooling channel 3, generally an insulating layer needs to be formed on the inner wall of the through holes, or the cooling medium uses an insulating material to prevent the leakage of the single battery 1 to the cooling system, or to prevent problems such as the cooling system causing the short circuit of the single battery 1.

[0083] As an implementable manner, the battery module further includes a second cooling channel 5 and a third cooling channel 6. The second cooling channel 5 and the third cooling channel 6 are respectively disposed at two ends of the single battery 1. One end of the through hole serving as the first cooling channel 3 is communicated with the second cooling channel 5, and the other end is communicated with the third cooling channel 6. The cooling medium flows from the second cooling channel 5 through the first cooling channel 3 into the third cooling channel 6, or the cooling medium flows from the third cooling channel 6 through the first cooling channel 3 into the second cooling channel 5.

[0084] As an implementable manner, at least refer to Figure 3 As shown, the heat dissipation holes 2 are through holes, and the first cooling channel 3 includes a first cooling pipe independent of the single battery 1. The first cooling pipe is in heat exchange cooperation with the heat dissipation holes 2; that is, the first cooling pipe is disposed through the heat dissipation holes 2 of the single battery 1 and is used to absorb the heat in the middle of the single battery 1 through the heat dissipation holes. Wherein, the second cooling channel 5 and the third cooling channel 6 are respectively disposed at two ends of the single battery 1; one end of the first cooling pipe is communicated with the second cooling channel 5, and the other end is communicated with the third cooling channel 6.

[0085] Wherein, either the second cooling channel 5 or the third cooling channel 6 serves as a cooling medium supply channel, and the other serves as a cooling medium return channel. The first cooling pipe connects the second cooling channel 5 and the third cooling channel 6 to each other, so that the cooling medium flows into the first cooling pipe from one of the second cooling channel 5 and the third cooling channel 6 and flows out from the other of the second cooling channel 5 and the third cooling channel 6 to form a flow path of the cooling medium to dissipate heat from at least the central part of the single battery 1.

[0086] As an implementable manner, a water inlet is provided in one of the second cooling channel 5 and the third cooling channel 6, and a water outlet is provided in the other. The setting of this structure can realize the entry and circulation of the cooling medium, and thus can efficiently and quickly dissipate heat from the central part of the single battery 1.

[0087] To improve the heat dissipation performance, heat dissipation protrusions are provided on the inner wall of the heat dissipation holes 2. The heat dissipation protrusions are in contact with the outer side surface of the first cooling pipe, so that the heat in the central part of the single battery 1 is directly transferred to the first cooling pipe through the heat dissipation protrusions and is carried away by the cooling medium flowing in the first cooling pipe.

[0088] In addition, it should be noted that the battery module may include a plurality of single cells 1. The plurality of single cells 1 may be arranged in an array or coaxially arranged. Of course, it may also be that after a part of them are coaxially arranged to form a component, and then a plurality of components are arranged in an array.

[0089] As an implementable manner, see also Figure 4 As shown, in the coaxially arranged structure adopted by the plurality of single cells 1, in this structure, the heat dissipation holes 2 are through holes, adjacent single cells 1 are coaxially arranged, and the opposite ends of the through holes of adjacent single cells 1 are connected to each other.

[0090] Coaxially arranging the single cells 1 facilitates their series connection.

[0091] While coaxially arranging the single cells 1, the opposite ends of the through holes of adjacent single cells 1 are connected to each other. For example, the tail of the through hole of one of the two adjacent single cells 1 is connected to the head of the through hole of the other single cell 1. Here, the head and tail refer to the two ends of the single cell 1. If one end is regarded as the head, the other end is regarded as the tail. As Figure 4 shown, for a single cell 1, its left end may be the head and the right end is the tail. Of course, it may also be that the right end is the head and the left end is the tail. By adopting the above connection method, a connected channel is formed in the middle of the plurality of single cells 1. This channel is a through hole, and a first cooling pipe can be arranged in this channel to be used as the first cooling flow channel 3; of course, in other examples, it is not necessary to additionally arrange a first cooling pipe in this channel, but directly use this channel as the first cooling flow channel 3 for the cooling medium to flow through to dissipate heat from the middle of the single cell 1.

[0092] In the coaxially arranged structure adopted by the above-mentioned plurality of single cells 1, the battery module further includes a second cooling flow channel 5 and a third cooling flow channel 6. The second cooling flow channel 5 and the third cooling flow channel 6 are respectively arranged at the ends of the two outermost single cells 1; one end of the first cooling flow channel 3 is communicated with the second cooling flow channel 5, and the other end is communicated with the third cooling flow channel 6. In addition, one of the second cooling flow channel 5 and the third cooling flow channel 6 is provided with a water inlet, and the other is provided with a water outlet.

[0093] Of course, in other examples, a fourth cooling flow channel 7 may also be arranged outside the single cell 1, and one end of the fourth cooling flow channel 7 is communicated with the second cooling flow channel 5, and the other end is communicated with the third cooling flow channel 6. The fourth cooling flow channel 7 is at least partially arranged outside the side wall of the single cell 1 and is at least used to dissipate heat from the outer side wall of the single cell 1.

[0094] By providing a fourth cooling channel 7 outside the side wall of the single battery 1, the outer side wall of the single battery 1 can be cooled. Combining with the above-mentioned first cooling channel 3, the middle and the outside of the single battery 1 can be cooled simultaneously, improving the cooling capacity, avoiding the accumulation of heat in the single battery 1, and preventing the problem of overheating of the single battery 1.

[0095] Specifically, at least see Figure 5 、 Figure 6 As shown, the battery module further includes a housing 9. The single battery 1 is disposed in the housing 9, and there is a gap between the single battery 1 and the inner wall of the housing 9, and the gap serves as at least a part of the fourth cooling channel 7.

[0096] The housing 9 can be an aluminum housing or a steel housing, etc. On the one hand, the housing 9 serves to encapsulate a plurality of single batteries 1 to form a battery module, for supporting and protecting the single batteries 1. On the other hand, there is a gap between the housing 9 and the single battery 1, and this gap serves as a part of the fourth cooling channel 7 for the cooling medium to flow through to cool the outside of the single battery 1.

[0097] Of course, in other examples, a second cooling pipe is provided between the side wall of the single battery 1 and the inner wall of the housing 9, and the second cooling pipe serves as at least a part of the fourth cooling channel 7. It can also be that the fourth cooling channel 7 is provided in the side wall of the housing 9, and the side wall of the housing 9 conforms to the single battery 1; that is, the side wall of the housing 9 can be a hollow structure, and at least a part of the side wall of the hollow structure serves as the fourth cooling channel 7.

[0098] As an implementable manner, also see Figure 5 As shown, the multiple single batteries 1 adopt an array arrangement structure. In this example, there are a total of eight single batteries 1 arranged in two rows and four columns. Of course, in other examples, other numbers of single batteries 1 can also be used. Among them, the arrangement directions of the rows and columns can be perpendicular or inclined to each other. In this example, the columns are inclined with respect to the rows. In the array-arranged single batteries 1, the heat dissipation holes 2 can be blind holes or through holes. Here, the through holes are taken as an example for illustration. Then, a first cooling pipe is correspondingly arranged in each heat dissipation hole 2 of the single battery 1 to dissipate heat from the corresponding heat dissipation hole.

[0099] In addition, based on the above example, in the structure where the multiple single batteries 1 adopt an array arrangement, the second cooling channel 5 and the third cooling channel 6 can also be included. The second cooling channel 5 and the third cooling channel 6 are respectively disposed at both ends of each single battery 1, and one end of the first cooling pipe is communicated with the second cooling channel 5, and the other end is communicated with the third cooling channel 6.

[0100] As described above, the second cooling channel 5 and the third cooling channel 6 are respectively disposed at the ends of the single battery 1. Then, at least one of them is at least used to cool the bottom of the single battery 1, and the other is at least used to cool the top of the single battery 1. To achieve simultaneous heat dissipation from multiple parts of the single battery 1, the heat dissipation capacity is improved, heat accumulation in the single battery 1 is avoided, and the problem of overheating of the single battery 1 is prevented.

[0101] As an implementable manner, at least refer to Figure 7 As shown, at least one of at least the second cooling channel 5 and the third cooling channel 6 includes at least two independent sub-cooling channels 10, and at least one of the at least two sub-cooling channels 10 communicates with the first cooling channel 3.

[0102] By setting the independent sub-cooling channels 10, the flow rate of the cooling medium in the sub-cooling channels 10 can be controlled respectively to precisely control the heat dissipation capacity of different parts.

[0103] In some examples, first confluence parts are connected to both ends of some of the sub-cooling channels 10, second confluence parts are connected to both ends of the remaining sub-cooling channels 10, a circulation pipeline 8 is connected between the first confluence parts and the second confluence parts on the same side, and a circulation pump and a heat exchanger are arranged in one of the circulation pipelines 8. By arranging a circulation pump on the circulation pipeline 8, the cooling medium is driven to flow. By arranging a heat exchanger, the cooling medium can be cooled down so that the cooling medium can continuously work to cool the middle part of the battery cell 1.

[0104] As an implementable manner, the sub-cooling channels 10 are parallel to each other.

[0105] As an implementable manner, a partition is arranged in at least any one of the second cooling channel 5 and the third cooling channel 6, and the partition divides the corresponding second cooling channel 5 or third cooling channel 6 into at least two independent sub-cooling channels 10.

[0106] By arranging the partition, on the one hand, the corresponding second cooling channel 5 or third cooling channel 6 can be divided into independent sub-cooling channels 10, and on the other hand, the stiffness and strength of the bottom of the housing 9 can be enhanced, so that multiple single batteries 1 can be arranged in the housing 9 to increase the overall capacity of the battery module.

[0107] As an implementable manner, the separator is supported between the top surface and the bottom surface of the corresponding second cooling channel 5 or the third cooling channel 6 to provide a supporting force between the top surface and the bottom surface of the corresponding second cooling channel 5 or the third cooling channel 6, preventing the corresponding second cooling channel 5 or the third cooling channel 6 from being crushed by the plurality of single cells 1.

[0108] As an implementable manner, the separator includes a separator plate 11 or a separator tube.

[0109] The separator plate 11 may be a flat plate, and a plurality of separator plates 11 may be arranged vertically or obliquely. Whether the separator plates 11 are inclined or vertical, a plurality of separator plates 11 can be arranged parallel to each other, as Figure 8 shown; they can be arranged intersectingly. Here, the intersecting arrangement means that one end (such as the top or bottom) of two adjacent separator plates 11 is directly connected together, that is, two separator plates 11 and the top or bottom surface of the third cooling channel enclose a triangle, as Figure 9 shown; or their extended surfaces can be connected together, that is, two separator plates 11 and the top and bottom surfaces of the corresponding second cooling channel 5 or the third cooling channel 6 enclose a trapezoid as Figure 10 shown.

[0110] The separator tube can be a circular tube, a triangular tube, a polygonal tube, etc. Figure 11 In the example, a circular tube is adopted.

[0111] In a second aspect, the present invention provides a module including an annular battery. The module includes the above-mentioned battery module. The annular battery includes the single cell 1, at least refer to Figure 13 shown.

[0112] As an implementable manner, at least another refer to Figure 12 、 Figure 13 shown, the annular battery includes a battery housing 12. The battery housing 12 includes an outer peripheral wall 123 and a core shaft 122 disposed inside the outer peripheral wall 123. The heat dissipation holes 2 are provided on the core shaft 122, and the heat dissipation holes 2 extend along the axis of the core shaft 122. It should be noted that the outer peripheral wall 123 is the above-mentioned inner layer wall, and the core shaft 122 is the above-mentioned outer layer wall.

[0113] Generally, the battery housing 12 can be made of a metal material, such as steel, aluminum, and aluminum alloy, etc. On the one hand, it can protect the annular battery core 13 (i.e., the above-mentioned bare battery core) disposed therein, and on the other hand, it can also serve as one of the electrodes of the single cell 1, such as the negative electrode or the positive electrode.

[0114] Among them, at least refer to Figure 15As shown, the outer peripheral wall 123 and the mandrel 122 can be an integral structure, such as by casting, or by stamping a metal plate; see also Figure 14 、 Figure 16 or Figure 17 As shown, the outer peripheral wall 123 and the mandrel 122 can also be a two-piece structure. Here, the two-piece structure means that the outer peripheral wall 123 and the mandrel 122 are two independent components. For example, the outer peripheral wall 123 and the mandrel 122 can be connected together by welding. When there is a bottom plate at the bottom of the outer peripheral wall 123, the mandrel 122 can be directly welded to the bottom plate of the outer peripheral wall 123. If the outer peripheral wall 123 is only an annular wall, the mandrel 122 can be connected to the outer peripheral wall 123 by means of an end cap. For example, one end of the mandrel 122 is welded to the end cap, and the end cap is welded to one end of the outer peripheral wall 123.

[0115] As an implementable manner, see also Figure 14 、 Figure 15 、 Figure 16 or Figure 17 As shown, the maximum linear distance D1 between any two points on the cross-section of the heat dissipation hole 2 is 0.11 - 0.65 of the maximum linear distance D2 between any two points on the cross-section of the outer peripheral wall.

[0116] For example but not limited to, the maximum linear distance D1 between any two points on the cross-section of the heat dissipation hole 2 is 5.15 mm, 5.3 mm, 6.25 mm, 7 mm, 8.66 mm, 13 mm, 15.35 mm, 18.7 mm, 19 mm, 22.9 mm, 24 mm, 28.4 mm, 29.46 mm, etc. The maximum linear distance between any two points on the cross-section of the heat dissipation hole 2 can be determined according to actual needs, as long as it satisfies that the maximum linear distance between any two points on the cross-section of the heat dissipation hole 2 is 0.11 - 0.65 of the maximum linear distance D2 between any two points on the cross-section of the outer peripheral wall 123 of the battery case. In addition, generally, the longer the length of the battery unit, the larger value can be selected for the maximum linear distance between any two points on the cross-section of the heat dissipation hole 2, that is, the maximum linear distance between any two points on the cross-section of the heat dissipation hole 2 is positively correlated with the length of the battery unit, so that the cooling medium can perform sufficient heat exchange in the heat dissipation hole 2 to take away the heat at the central part of the battery unit to the greatest extent and improve the heat dissipation effect on the battery unit. The heat dissipation of the cooling medium in the heat dissipation hole 2 can be achieved by inputting the cooling medium through a liquid cooling pipe, and the cooling medium dissipates heat from the central part of the battery unit, or by means of heat conduction such as cooling columns to dissipate heat from the central part of the battery unit.

[0117] As an implementable manner, the annular battery further includes an annular battery core 13, and the annular battery core 13 is sleeved outside the mandrel 122.

[0118] Among them, a cavity is formed between the outer peripheral wall 123 and the mandrel 122. The cross-sectional shape of the cavity is annular. The cavity serves as at least the installation space for the annular battery cell 13. The annular battery cell 13 is installed in this space, and the annular battery cell 13 is sleeved outside the mandrel 122.

[0119] As an implementable manner, a plurality of heat dissipation protrusions 21 are provided on the pore wall of the heat dissipation hole 2. By providing the heat dissipation protrusions 21 on the pore wall of the heat dissipation hole 2, the inner surface area of the pore wall can be increased, and the heat dissipation performance can be improved.

[0120] As an implementable manner, one end of the heat dissipation hole 2 is closed and the other end is open; or, both ends of the heat dissipation hole 2 are open.

[0121] Specifically, among them, at least as Figure 14 shown, the above-mentioned mandrel 122 itself can be closed at one end and open at the other end to form a heat dissipation hole 2 in the form of a blind hole. The heat dissipation hole 2 is used to dissipate heat from the middle of the single battery 1; in other examples, at least as Figure 16 shown, the above-mentioned mandrel 122 itself can be open at both ends, and one end of it is closed by other external components. For example, one end of it is closed by a battery end cap or the bottom plate of the outer peripheral wall 123 to form a blind hole. The blind hole can be used as the heat dissipation hole 2 to dissipate heat from the middle of the single battery 1.

[0122] Of course, in other examples, at least referring to Figure 17 shown, both ends of the mandrel 122 are open to form a through hole. The through hole can be used as the heat dissipation hole 2 to dissipate heat from the middle of the single battery 1.

[0123] In a third aspect, the present invention provides an electrical device, including the above-mentioned battery module; or, including the above-mentioned module containing annular batteries.

[0124] The electrical device is, for example but not limited to, new energy vehicles (electric vehicles, hybrid vehicles, etc.), digital products, etc.

[0125] It should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the above text is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0126] The above description is only the preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A battery module, characterized in that, Comprising: A single cell (1), a heat dissipation hole (2) is provided in the middle of the single cell (1), and the single cell (1) adopts same-side tab or opposite-side tab; A cooling unit, including a first cooling flow channel (3), the first cooling flow channel (3) is formed in the heat dissipation hole (2) for dissipating heat from the middle of the single cell (1); The heat dissipation hole (2) is a blind hole, and at least one partition (4) is provided in the blind hole. The partition (4) divides the blind hole into sub-flow channels connected end to end in sequence, and the sub-flow channels connected end to end in sequence form the first cooling flow channel (3). At least one flow-through hole (41) penetrating the partition (4) is provided on the partition (4).

2. The battery module according to claim 1, characterized in that, The flow-through hole (41) is a strip-shaped hole, and the length extension direction of the strip-shaped hole is parallel to the axis of the heat dissipation hole (2).

3. The battery module according to claim 1, wherein, The cooling unit further includes a fourth cooling flow channel (7), and at least a part of the fourth cooling flow channel (7) is arranged outside the side wall of the single cell (1) for at least dissipating heat from the outer side wall of the single cell (1).

4. The battery module according to claim 3, wherein The battery module further includes a housing (9), and the single cell (1) is arranged in the housing (9); A second cooling pipe is arranged between the side wall of the single cell (1) and the inner wall of the housing (9), and the second cooling pipe at least serves as a part of the fourth cooling flow channel (7); Alternatively, the fourth cooling flow channel (7) is arranged in the side wall of the housing (9), and the side wall of the housing (9) conforms to the single cell (1).

5. The battery module according to claim 1, characterized in that, The single cell (1) is a cylindrical battery.

6. A module comprising a ring-shaped battery, characterized in that, The module includes the battery module according to any one of claims 1-5, and the ring-shaped battery includes the single cell (1).

7. The module including the ring-shaped battery according to claim 6, characterized in that, The ring-shaped battery includes a battery housing (12), the battery housing (12) includes an outer peripheral wall (123) and a core shaft (122) penetrating through the outer peripheral wall (123). The heat dissipation hole (2) is provided on the core shaft (122), and the heat dissipation hole (2) extends along the axis of the core shaft (122).

8. The module comprising a ring-shaped battery according to claim 7, wherein, The maximum straight-line distance between any two points on the cross-section of the heat dissipation hole (2) is 0.11-0.65 of the maximum straight-line distance between any two points on the cross-section of the outer peripheral wall (123).

9. The module comprising a ring-shaped battery according to claim 7, characterized in that, The ring-shaped battery further includes a ring-shaped battery core (13), and the ring-shaped battery core (13) is sleeved outside the core shaft (122).

10. The module comprising a ring-shaped battery according to claim 7, characterized in that, A plurality of heat dissipation protrusions (21) are provided on the hole wall of the heat dissipation hole (2).

11. The module comprising a ring-shaped battery according to claim 9, characterized in that, The outer peripheral wall (123) and the core shaft (122) enclose a cavity for accommodating the ring-shaped battery core (13), and the cross-sectional shape of the cavity is annular.

12. An electrical device, characterized in that, Including the battery module according to any one of claims 1-5; or, including the module including a ring-shaped battery according to any one of claims 6-11.

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