CN117254162B - Air duct assembly, battery cluster and method for balancing temperature in battery cluster - Google Patents

Abstract

The present invention relates to the field of batteries; the invention provides an air duct assembly, a battery cluster and a method for balancing the temperature in the battery cluster; the air duct assembly is used for being arranged on the battery rack to enable the air supply device to supply air to the battery pack; the air duct assembly comprises a framework, wherein the framework comprises a main board and a side frame arranged on the side edge of the main board, and the main board and the side frame enclose a channel for ventilation; one of the side frame and the main board is provided with a vent hole, and the vent hole is used for enabling wind to go to the battery pack from the channel; the air duct assembly further comprises a vertical separation plate; the vertical separation plate extends along the up-down direction, is positioned between the side frame and the main plate, separates the air duct into a plurality of separation air ducts, the plurality of separation air ducts are sequentially arranged from front to back, and the length of the front-most separation air duct in the front-rear direction is smaller than that of the rear-most separation air duct in the front-rear direction.

Description

Air duct assembly, battery cluster and method for balancing temperature in battery cluster

Technical Field

The invention relates to the field of batteries, in particular to an air duct assembly, a battery cluster and a method for balancing the temperature in the battery cluster.

Background

As shown in fig. 1, in the energy storage field, an air-cooled battery cluster generally includes a battery rack, a plurality of battery packs a, and a single high-voltage tank b; the battery rack is provided with a middle air duct c positioned between two rows of battery packs a and a side air duct d positioned outside the battery rack of the single row of battery packs a; the middle duct c and the side duct d are both communicated with an air blowing device such as an air conditioning system, and can blow cold air from the air blowing device into the battery pack a on the battery rack. Correspondingly, a fan e is mounted on the front surface of each battery pack a, and the fan e can operate when the battery packs a need to dissipate heat so as to draw out the air in the battery packs a.

Based on the above arrangement, when the battery cluster needs to dissipate heat, cold air is blown from the upper part of the battery frame to the lower part of the battery frame and enters the battery pack a positioned on the battery frame, so as to dissipate heat of each battery module in the battery pack a and the battery cells in each battery module; simultaneously, the fan e can pump the air in the battery pack a outwards, so that the air absorbing the heat in the battery pack a is discharged out of the battery frame; thereby, the battery pack a is cooled, and the battery cluster is cooled.

The scheme has the defects that: since the fan e is mounted on the front surface of the battery pack a, the suction force of the fan e gradually decreases in the front-rear direction; that is, in the battery pack a, the better the cooling of the battery cells located at the front part of the battery cluster is, the worse the cooling effect of the battery cells located at the rear part of the battery cluster is; the cooling efficiency and temperature of the entire battery cluster in the front-rear direction are not uniform.

It is obvious that the battery pack a is more likely to have a problem in service life when the battery cells in the rear part of the battery pack a are long in the case of imbalance in cooling efficiency and temperature throughout the front-rear direction. In addition, in a use scenario in which the battery pack a in the battery cluster is heated up and down by operation, a safety problem is more likely to occur even in a case where there is a region of slower cooling in the battery cluster.

Disclosure of Invention

The invention aims to provide an air duct assembly, a battery cluster and a method for balancing the temperature in the battery cluster.

The air duct assembly is used for being arranged on the battery rack, so that the air supply device supplies air to the battery pack; the air duct assembly comprises a framework, wherein the framework comprises a main board and a side frame arranged on the side edge of the main board, and the main board and the side frame enclose a channel for ventilation; one of the side frame and the main board is provided with a vent hole, and the vent hole is used for enabling wind to go to the battery pack from the channel; the air duct assembly further comprises a vertical separation plate; the vertical separating plate is arranged in an extending manner along the up-down direction and is positioned between the side frame and the main board to separate the air duct into a plurality of separating air ducts, the plurality of separating air ducts are sequentially arranged from front to back, and the length of the front-most separating air duct in the front-rear direction is smaller than that of the rear-most separating air duct in the front-rear direction;

The air duct assembly further comprises a plurality of flow-making pieces; in the up-down direction, the flow-making member divides at least one part of the channel into a plurality of different flow-making areas so as to prevent part of wind entering the flow-making areas from descending and enable the wind to strike the flow-making member to form backflow and accumulation of the wind.

Optionally, lengths of the plurality of air dividing channels in the front-rear direction are sequentially increased.

Optionally, a part of the vertical separation plate is penetrated along the front-rear direction, so as to form an avoidance area; the flow generating piece is formed by extending along the front-back direction and is positioned between the side frame and the main plate and penetrates through the avoidance area.

Optionally, the skeleton comprises two side frames, and the two side frames are respectively positioned at two opposite sides of the main board and are connected with each other; the main board and one of the two side frames enclose a first main air channel, and the other of the two side frames encloses a second main air channel; and the first main air duct and the second main air duct are internally provided with vertical separating plates and flow-making pieces.

Optionally, the air duct assembly further comprises a first driving piece, a second driving piece and a third driving piece which are fixedly arranged; the first driving piece is configured to drive the main board to move left and right, and change the ventilation quantity of the first main air duct and the second main air duct; the second driving piece is configured to drive the vertical sub-plate to move back and forth, and change the ventilation quantity of the sub-air duct; the third driving piece is configured to drive the flow-making piece to move up and down, and the shape of the flow-making area is changed.

Optionally, a space exists between each vertical separation plate and the main plate; in the air duct assembly, the first driving piece drives the main board to move left and right in the interval; the first driving piece is fixed on a side frame and fixedly connected with the main board; the second driving piece is fixed on the main board and is fixedly connected with the vertical split board; the third driving piece is fixed on the main board and fixedly connected with the flow-making piece.

The invention also provides a battery cluster comprising the air duct assembly.

The invention also provides a battery cluster, which comprises two rows of battery packs, a battery rack and the air duct assembly; the air duct assembly is located between the two rows of battery packs, each row of battery packs in the two rows of battery packs comprises a plurality of battery packs, and the battery packs are sequentially arranged on the battery frame along the up-down direction.

The invention also provides a method for balancing the temperature in the battery cluster, which uses the battery cluster and comprises the following steps:

s1, detecting temperatures of two temperature measuring points arranged in tandem; s2, executing;

s2, calculating a temperature difference value between the two temperature measuring points, and judging whether temperature balancing operation is required to be carried out on the two temperature measuring points in the S1 according to the temperature difference value; if the temperature difference value exceeds a first allowable value, judging that temperature equalization operation is required; s3, executing;

S3, moving at least one vertical split plate near at least one temperature measuring point along the front-back direction according to the temperature relation between the two temperature measuring points so as to change the air quantity passing through the at least one temperature measuring point; s4, executing;

s4, recalculating the temperature difference between the two temperature measuring points after waiting for the first time, judging whether the temperature difference exceeds a first allowable value, and if so, executing S5;

s5, repeatedly executing S3-S4 until the temperature difference between the two temperature measuring points is smaller than a first allowable value.

The invention also provides a method for equalizing the temperature in the battery cluster, wherein the battery cluster comprises the air duct assembly, and the method for equalizing the temperature in the battery cluster comprises the following steps:

s1', detecting the temperatures of two temperature measuring points at different heights; executing S2';

s2', calculating a temperature difference value between the two temperature measuring points, judging whether temperature balancing operation is required to be performed on the two temperature measuring points in the S1' according to the temperature difference value, and judging that the temperature balancing operation is required to be performed if the temperature difference value exceeds a second allowable value; executing S3';

s3', according to the temperature relation between the two temperature measuring points, at least one flow making piece positioned near at least one temperature measuring point is adjusted along the up-down direction so as to change the air quantity passing through the at least one temperature measuring point; executing S4';

S4', waiting for a second time, recalculating a temperature difference value between the two temperature measuring points, judging whether the temperature difference value exceeds a second allowable value, and if not, executing S5';

s5', repeating S3' -S4' until the temperature difference between the two temperature measuring points is smaller than a second allowable value.

In summary, according to the invention, the vertical sub-plates are arranged in the channels formed by the main plate and the side frame to form the sub-air channels with the number of at least two, and the length of the forefront sub-air channel in the front-rear direction is smaller than that of the last sub-air channel in the front-rear direction, so that the beneficial effects of balancing the cooling efficiency and the temperature of each battery cluster in the front-rear direction can be achieved, the problem of service life of the battery cells near the rear part of the battery cluster in the battery pack is not easy to occur, and the safety of the battery cluster in a working scene is indirectly improved.

The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a structure of a battery cluster in the related art.

Fig. 2 is a schematic view of a battery cluster according to a first embodiment of the present invention.

Fig. 3 is a schematic diagram of an assembled air supply duct and a battery pack according to a first embodiment of the present invention.

Fig. 4 is a schematic diagram showing a comparison of the main board, the housing and the side frame before and after assembly according to the first embodiment of the present invention.

Fig. 5 is a schematic view of a first main air duct and a second main air duct according to a first embodiment of the present invention.

Fig. 6 is a schematic diagram illustrating a cold air split by the motherboard in an embodiment of the present invention.

FIG. 7 is a schematic diagram of an arrangement of a first driving member in an intermediate duct assembly according to an embodiment of the invention.

Fig. 8 is a schematic diagram of cold air split by a vertically arranged split plate in the first embodiment of the present invention.

FIG. 9 is a schematic diagram of an arrangement of a flow making member on an intermediate duct assembly according to a first embodiment of the present invention.

Fig. 10 is a schematic view of the structure in the region E in fig. 9.

FIG. 11 is a schematic diagram showing reflux accumulation of cold air in a flow-making zone according to a first embodiment of the present invention.

Fig. 12 is a schematic view of the structure in the region F in fig. 9.

Fig. 13 is a schematic diagram showing a relative positional relationship between a temperature measuring point a and a temperature measuring point B in a third embodiment of the present invention.

Fig. 14 is a schematic diagram showing a relative positional relationship between a temperature measuring point a and a temperature measuring point C in a third embodiment of the present invention.

Fig. 15 is a schematic diagram showing a relative positional relationship between a temperature measurement point a and a temperature measurement point D in the third embodiment of the present invention.

Description of the reference numerals

a-battery pack, b-high-pressure box, c-middle air duct, d-side air duct, e-fan and f-air supply pipeline;

1-middle duct assembly, 11-framework, 111-main board, 112-side frame, 1121-ventilation hole, 12-first main duct, 13-second main duct, 14-first driving piece, 15-vertical separation plate, 151-first separation duct, 152-second separation duct, 153-third separation duct, 154-fourth separation duct, 155-fifth separation duct, 156-sixth separation duct, 15 a-first plate, 15 b-second plate, 15 c-third plate, 15 d-fourth plate, 15 e-fifth plate, 16-second driving piece, 17-flow-making piece, 171-flow-making area, 172-first flow-making piece, 173-second flow-making piece, 174-avoidance area, 18-third driving piece, 19-bottom bracket, 2-side duct assembly.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," "coupled," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. In some cases, when something is expressed as being fixedly connected to something, a particular connection may also include an integral connection. The specific meaning of the terms described above will be understood by those of ordinary skill in the art as the case may be.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like herein refer to an orientation or positional relationship based on that shown in the drawings, or that is conventionally put in place when the inventive product is used, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention.

The terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements is included, and that other elements not expressly listed may be included.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "exemplary," "specific examples," "optionally," "further," "more detailed description," "preferably," "still further," "still include" or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

It should be noted that, in the description of the present application, the azimuth or positional relationship indicated by the term "end" or the like is based on the azimuth or positional relationship shown in the drawings, and is merely for convenience of description of the present application and simplification of the description, and is not indicative or implying that the components in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.

As shown in fig. 2 and 3, the present embodiment provides a battery cluster including a battery frame, fifteen battery packs and a high-voltage tank b, wherein the fifteen battery packs and the high-voltage tank b are all mounted on the battery frame, the fifteen battery packs are arranged in two rows, the two rows of battery packs are arranged at intervals in the left-right direction, eight battery packs are provided in total by the left row of battery packs, seven battery packs are provided in total by the right row of battery packs, and the high-voltage tank b is arranged at the lower sides of the seven battery packs.

The battery cluster further comprises an air duct assembly positioned between the two rows of battery packs and positioned outside the battery rack of the single row of battery packs; the air duct assemblies are communicated with the air conditioning system through an air supply pipeline f positioned at the upper side of the battery cluster, and are used for enabling cold air from the air conditioning system to be blown to the battery pack on the battery rack. Correspondingly, a fan e is arranged on the front surface of each battery pack, and the fan e can operate when the battery packs need to dissipate heat so as to pump air in the battery packs out of the battery packs.

With continued reference to fig. 2, the air duct assembly between two rows of battery packs is referred to as a middle air duct assembly 1, and the air duct assembly outside the battery rack of a single row of battery packs is referred to as a side air duct assembly 2; as shown in fig. 4 and 5, the middle air duct assembly 1 of the present embodiment includes a frame 11, where the frame 11 includes a main board 111 and two side frames 112 surrounding the main board 111, the main board 111 is a straight and straight plate, the two side frames 112 are substantially U-shaped frames with an opening structure, the two side frames 112 are provided with ventilation holes 1121, the openings of the two side frames 112 are oppositely arranged at the left and right sides of the main board 111, and are connected with each other by welding or adhesion.

In view of the above, the channel defined by the main board 111 and the side frame 112 located at the left side thereof is the first main air channel 12, the channel defined by the main board 111 and the side frame 112 located at the right side thereof is the second main air channel 13, and when the cool air from the air conditioning system enters the middle air channel assembly 1 from top to bottom, it can be known that due to the existence of the main board 111, as shown in fig. 5 and 6, the cool air is divided into two (the cool air is indicated by the dotted arrows in fig. 6), and then enters the single-row battery packs located at the left and right parts of the battery clusters through the ventilation holes 1121 on the different side frames 112.

With continued reference to fig. 7, the middle duct assembly 1 further includes a number two of first driving members 14; the two first driving parts 14 are arranged in tandem on the middle air duct assembly 1, and the first driving parts 14 are specifically small motors (or called motors) comprising main bodies and motor shafts, wherein the main bodies are fixed on side frames 112 at the left part of the middle air duct assembly 1, and the motor shafts are fixed on a main board 111; meanwhile, the first driving member 14 also provides a supporting force for the main board 111, so that the main board 111 stands beside the side frame 112. In this embodiment, the first driving member 14 is used to drive the main board 111 to move left and right, so as to change the volumes of the first main air duct 12 and the second main air duct 13 according to the needs of those skilled in the art, thereby adjusting the amount of cold air entering the first main air duct 12 and the second main air duct 13. In one embodiment, the manner in which the first driving member 14 drives the main plate 111 to move left and right includes providing threads on the outer surface of the motor shaft and the inner surface of the motor shaft through hole on the main plate 111 to drive the main plate 111 to move left and right in a manner similar to a screw nut.

To explain this in more detail, due to the presence of the high-pressure tank b (see fig. 2) and/or the possible functional difference between the fans e of each battery pack, the total amount of cold air required for two rows of battery packs respectively located on the left and right sides of the middle duct assembly 1 is likely not equal when good temperature uniformity and cooling rate uniformity between all battery packs on the battery cluster are required; based on this, the present embodiment allows the amount of cool air entering the first main duct 12 and the second main duct 13 to be flexibly adjusted by designing the aforementioned main board 111 and the first driving member 14. It will be appreciated that the number of first drivers 14 belongs to a flexible set-up.

Referring back to fig. 2, as described in the background art, since the fan e is installed at the front surface of the battery pack, the suction force of the fan e gradually decreases from front to rear in the front-rear direction, and the better the battery cells located at the front of the battery cluster can be cooled, the worse the cooling efficiency of the battery cells located at the rear of the battery cluster. To improve this, the middle duct assembly 1 of the present embodiment further includes a plurality (all "a plurality" herein refer to at least two) of vertical sub-plates 15 as shown in fig. 4, and the plurality of vertical sub-plates 15 are disposed to extend in the up-down direction and are located between the main plate 111 and each side frame 112 at intervals; the plurality of vertically-arranged sub-plates 15 are used to separate a plurality of (all "a plurality of" herein refer to at least two) sub-air ducts arranged in the up-down direction on the middle air duct assembly 1, and make the length of the foremost sub-air duct in the front-rear direction larger than the length of the rearmost sub-air duct in the front-rear direction.

With continued reference to fig. 7 and 8, in this embodiment, a number of ten vertical sub-plates 15 are specifically provided, where the ten vertical sub-plates 15 are arranged in two rows, one row of the two rows of vertical sub-plates 15 is arranged in the first main air duct 12, the other row is arranged in the second main air duct 13, and five vertical sub-plates 15 arranged at intervals in the front-rear direction are provided in each row of vertical sub-plates 15; in the first main air duct 12 and the second main air duct 13, six branch air ducts are respectively separated from each column of vertical branch plates 15, a space p exists between each vertical branch plate 15 and the main board 111, and a part of a channel (namely the first main air duct 12 or the second main air duct 13) surrounded by the main board 111 and the side frame 112 is blocked; in this embodiment, the designs of the split air channels in the first main air channel 12 and the second main air channel 13 are identical, and for brevity, the following details of the split air channels will be described by taking six split air channels in the second main air channel 13 as examples:

In the second main air duct 13, according to six air separation ducts, a first air separation duct 151, a second air separation duct 152, a third air separation duct 153, a fourth air separation duct 154, a fifth air separation duct 155 and a sixth air separation duct 156 are sequentially arranged from front to back, and the first air separation duct 151 and the sixth air separation duct 156 are respectively formed by enclosing a vertical sub-plate 15 and a framework 11 positioned at the periphery of the middle air separation duct assembly 1 because the first air separation duct and the sixth air separation duct are positioned at the end part of the middle air separation duct assembly 1, and the other four air separation ducts of the second air separation duct 152, the third air separation duct 153, the fourth air separation duct 154 and the fifth air separation duct 155 are respectively formed by enclosing a vertical sub-plate 15, a vertical sub-plate 15 adjacent to the vertical sub-plate 15 and a framework 11 positioned between the two adjacent vertical sub-plates 15; the lengths z of these branched air channels in the front-rear direction sequentially increase from the first branched air channel 151 to the sixth branched air channel 156.

With continued reference to fig. 7 and 8, based on the arrangement of the main board 111 and the vertical split board 15, when the cool air from the air conditioning system is split into two to enter the first main air duct 12 and the second main air duct 13, the cool air is further subdivided in the front-rear direction in the first main air duct 12 and the second main air duct 13 (the cool air is indicated by the dotted arrows in fig. 8). It can be appreciated that, from the first air dividing duct 151 to the sixth air dividing duct 156, the lengths z of the air dividing ducts in the front-rear direction are sequentially increased, and the design of the air dividing ducts is more spacious from front to rear, so that the air quantity passing through the rear battery cell of the battery pack can be improved to a certain extent; meanwhile, as the battery cell positioned at the front part of the battery pack is close to the fan e, the flow speed of wind at the periphery side of the battery cell is faster, so that the cooling rate of the battery pack at the front part of the battery cell is not affected unacceptably, but is close to the cooling rate, temperature and other conditions of the battery pack at the rear part of the battery cell. The design of the air distribution duct from front to back is more spacious, and the temperature consistency, cooling rate consistency and air receiving volume consistency of all the electric cores in the battery pack can be improved to a certain extent.

It should be emphasized that, since the main board 111 can also move under the driving of the first driving member 14, in this embodiment, a space p exists between the main board 111 and both the vertical sub-board 15 in the first main duct 12 and the vertical sub-board 15 in the second main duct 13, so that a space for the main board 111 to move left and right is provided.

It will be appreciated that the number of vertically disposed sub-plates 15 for enclosing the component air duct is a flexible design term; in the present invention, the vertical dividing plates 15 may be provided between the side frame 112 and the main plate 111 in at least one number. For example, a number of one vertical sub-plates 15 may be provided in the first main duct 12, the vertical sub-plates 15 and the frame 11 located on the peripheral side thereof enclosing a number of two sub-ducts, the length of the former in the front-rear direction of the two sub-ducts being smaller than the length of the latter in the front-rear direction of the two sub-ducts.

With continued reference to fig. 7 and 8, when the battery pack works, the temperature of the battery cells in the battery pack varies at all times, and there are many individual differences among the battery cells located at different positions of the battery pack, so the middle air duct assembly 1 of this embodiment further includes a second driving member 16, where the second driving member 16 is similar to the first driving member 14, and also is a small motor (or called a motor) including a main body and a motor shaft, and is disposed in one-to-one correspondence with the vertical split plate 15. In this embodiment, the main body of each second driving member 16 is fixed on the main board 111, the motor shaft is fixed on a vertical sub-board 15, and a mode of arranging threads at corresponding positions of the motor shaft and the vertical sub-board 15 can be adopted to enable the second driving member 16 to drive the vertical sub-board 15 to move back and forth, so as to change the ventilation quantity of the sub-air duct related to the vertical sub-board 15; at the same time, the second driving member 16 also serves to support the vertically placed sub-plate 15 standing in the frame 11.

It will be appreciated that the second driving members 16 do not have to be arranged in one-to-one correspondence with the vertically arranged sub-plates 15; for example, in a possible embodiment, the upper, middle and lower portions of a vertical sub-plate 15 may be fixedly connected to a second driving member 16, respectively, where there is a one-to-many relationship between the vertical sub-plate 15 and the second driving member 16, and the vertical sub-plate 15 is driven by a plurality of second driving members 16. In a possible embodiment, the one-to-many drive arrangement is also suitable for being provided between the first drive member 14 and the main plate 111.

Referring back to fig. 2, in the related art, the cooling rate of the battery pack in the battery cluster further includes the following characteristics: in the up-down direction, the temperature of the battery packs positioned at the upper part and the lower part of the battery cluster is lower than that of the battery packs positioned at the middle part of the battery cluster. This is caused because the kinetic energy of the cool air from the air conditioning system is gradually reduced in the process of going down from the top, so that the battery pack located at the upper part of the battery cluster can be sufficiently cooled; meanwhile, as the lower part of the battery cluster is mostly in a closed structure or is closer to the ground, the air flowing to the lower part of the battery cluster can generate a reflux aggregation phenomenon (namely, the air is aggregated to a certain extent at the lower part of the battery cluster) due to the existence of the closed structure or the ground, and then flows to the battery packs positioned at the left lower part and the right lower part of the battery cluster, so that the cold air quantity at the lower part of the battery cluster is also relatively sufficient; in the vertical direction, the amount of cool air obtained by the battery packs positioned on the left and right sides of the middle of the battery cluster is relatively small. Obviously, this results in poor temperature uniformity and cooling rate uniformity between the battery packs at different heights at the middle position of the battery cluster.

As described above, in the present embodiment, as shown in fig. 4, a base 19 is provided at the lower portion of the middle duct assembly 1, and the base 19 seals the middle duct assembly 1, which is equivalent to the closed structure mentioned in the above related art. Based on this, in order to solve the problem that there is poor temperature uniformity between the battery packs located at the middle of the battery cluster and at different heights, as shown in fig. 4 and 5, the middle duct assembly 1 further includes eight flow-creating members 17 (only four are shown in fig. 4), four of the eight flow-creating members 17 being disposed at the middle of the first main duct 12, and the remaining four being disposed at the middle of the second main duct 13; in this embodiment, the flow-making member 17 is used to block part of the wind entering the flow-making region 171, so that the wind impinges on the flow-making member 17 to form a backflow, thereby increasing the air volume retained in the middle of the battery cluster, and finally indirectly increasing the cold wind from the middle air duct assembly 1 to the left and right sides of the middle air duct assembly 1. In this embodiment, the design of the four flow-making members 17 in the first main air duct 12 is the same as the design of the four flow-making members 17 in the second main air duct 13, so the following description will be given by taking the four flow-making members 17 in the second main air duct 13 as an example:

as shown in fig. 9 and 10, the flow-making member 17 is a U-shaped bar formed extending in the front-rear direction with the opening facing downward, and is configured to be almost equal in length to the main plate 111 in the front-rear direction. To avoid the flow-making member 17, a portion of the vertically disposed sub-plate 15 in the second main air duct 13 is penetrated in the front-rear direction, and an avoidance area 174 is formed. As shown in fig. 8 and 9, in the up-down direction, the flow making member 17 blocks a part of the second main air duct 13 surrounded by the main plate 111 and the side frame 112, and is in contact with the main plate 111 with a gap between the side frame 112; as shown in fig. 10 and 11, in the middle of the second main duct 13, four flow-making members 17 are sequentially arranged at intervals from top to bottom, and each flow-making member 17, the skeleton 11 located on the peripheral side of the flow-making member 17, and the flow-making members 17 adjacent to the flow-making member 17 together enclose a flow-making region 171; in the middle of the second main air duct 13, four flow-creating members 17 enclose a number of three flow-creating areas 171.

With continued reference to fig. 11 (in which the dashed arrows indicate the flow direction of the cold air), based on the arrangement of the flow-creating area 171, the uppermost one of the four flow-creating members 17 is the first flow-creating member 172, and the flow-creating member 17 adjacent to the first flow-creating member 172 is the second flow-creating member 173, in this embodiment, when the cold air descends to the first flow-creating member 172, it passes through the gap between the first flow-creating member 172 and the side frame 112, and then descends continuously; in the cold air continuing downward, part of the cold air continues to cross the gap between the second flow-making member 173 and the side frame 112 and then descends, part of the cold air impinges on the upper surface of the second flow-making member 173, and a reflux aggregation phenomenon is found between the first flow-making member 172 and the second flow-making member 173 (and also in the flow-making region 171 correspondingly surrounded by the first flow-making member 172 and the second flow-making member 173), and then goes to the battery pack (located in the middle of the battery cluster) located on the right side of the second main air duct 13; in this way, due to the presence of the flow-making region 171, the amount of cold air that is first left in the middle of the middle duct assembly 1 can be increased, and thus, the amount of cold air that is sent from the middle of the middle duct assembly 1 to the battery pack at the same height can be increased. Since the first flow-forming member 172 also forms a barrier against cold air, a slightly weak backflow aggregation phenomenon is formed on the upper side thereof.

It is understood that, on the premise that the number of the flow-making members 17 is at least two, those skilled in the art can flexibly design the number of the flow-making members 17 according to the need.

It should be noted that, in the present embodiment, the flow generating member 17 is of a U-shaped design, so as to reserve cold air as much as possible, so as to ensure the reflux and aggregation effects of the cold air in the flow generating region 171; it will be appreciated that in a possible embodiment the flow member 17 may also be in the form of a flat plate, or in the form of a wave.

It will be appreciated that although in this embodiment the flow member 17 is brought into contact with the main plate 111 and a gap exists between the flow member and the side frame 112, the flow member 17 may be positioned in the duct assembly only by the support of the third driving member 18 (see below) without affecting the specific requirements of those skilled in the art, without affecting the ability of the flow region 171 to be formed; in addition, the flow-making member 17 may be disposed in contact with the side frame 112 with a gap between the main plate 111.

In addition, the person skilled in the art can also adjust the reflux accumulation effect of the cold air in the flow-making region 171 by controlling the length of the flow-making member 17 in the left-right direction (corresponding to controlling the opening width of the U-shaped flow-making member 17) and/or controlling the interval between the adjacent flow-making members 17 in the up-down direction (i.e., the height of the flow-making region 171).

In the present embodiment, the longer the length of the flow generating member 17 in the left-right direction is, the better the reflux collecting effect of the flow generating region 171 is, without completely blocking the space between the side frame 112 and the main plate 111. If the spacing between adjacent flow-making members 17 in the up-down direction is appropriately reduced (for example, 2 to 5mm, based on the actual test and calibration results), the reflux gathering effect of the flow-making region 171 can be enhanced by impinging cold air on the flow-making members 17 more quickly; on the other hand, if the interval between the adjacent flow-making members 17 in the up-down direction is increased appropriately (for example, 2 to 5mm, based on the actual test and calibration results), the reflux aggregation effect of the flow-making region 171 corresponding to the adjacent flow-making member 17 is reduced; in addition, since the position of the flow-creating member 17 is changed, the reflux aggregation effect of the flow-creating region 171 adjacent to the flow-creating region 171 is affected to some extent, whether the reflux aggregation effect of the flow-creating region 171 corresponding to the flow-creating member 17 is reduced or enhanced. When the position of the first flow-creating member 172 is adjusted, additionally, the reflux accumulation effect of the non-flow-creating region located at the upper side of the first flow-creating member 172 is also affected.

Furthermore, in a possible embodiment, at least one of the plurality of flow-creating members 17 may have a different length in the left-right direction from the other flow-creating members 17; alternatively, the flow-creating members 17 adjacent to each other may have different lengths in the left-right direction. For example, since the wind speed is smaller as the cool wind goes to the lower portion of the middle duct assembly 1, in order to further enhance the backflow gathering effect, one skilled in the art may make one of the flow-creating members 17 have a first width in the left-right direction, make the adjacent flow-creating member 17 located at the lower side of the flow-creating member 17 have a second width, and make the first width smaller than the second width.

With continued reference to fig. 9 and 12, the middle duct assembly 1 of the present embodiment further includes a third driving member 18, which is similar to the second driving member 16, is a small motor (or called a motor) including a main body and a motor shaft, and is disposed in one-to-one correspondence with the flow-making members 17 (only one third driving member 18 is illustrated in fig. 9); the main body of each third driving member 18 is fixed on the main board 111, the motor shaft is fixed on a flow-making member 17, specifically, threads can be arranged at corresponding positions of the third driving member 18 and the flow-making member 17, so that the third driving member 18 can drive the flow-making member 17 to move up and down, and the shape of the flow-making region 171 related to the flow-making member 17 is changed; at the same time, the flow-building element 17 spans the framework 11 by virtue of its support by the third drive element 18.

It will be appreciated that the third driving members 18 do not have to be arranged in a one-to-one correspondence with the flow-making members 17; for example, in a possible embodiment, the front, middle and rear parts of a flow-making member 17 may be fixedly connected to a third driving member 18, respectively, in which case there is a one-to-many relationship between the flow-making member 17 and the third driving member 18, and the flow-making member 17 is driven by a plurality of third driving members 18.

In addition, in the present embodiment, the up-and-down movement stroke of the flow forming member 17 is limited by the form of the avoidance area 174, and the avoidance area 174 is specifically a U-shaped through hole that opens toward the main plate 111, and the length in the up-and-down direction thereof is greater than or equal to the movement stroke of the flow forming member 17 in the up-and-down direction.

Furthermore, in a possible embodiment, the wires of the aforementioned first, second and third driving members 14, 16 and 18 may be led out through the vent holes of the respective side frames 112.

Furthermore, in a possible embodiment, the flow-creating member 17 may also have a length of about one-half of the main plate 111 in the front-rear direction only; at this time, the rear side of the flow-creating member 17 may be further provided with another flow-creating member 17 having a length of about one-half of the main plate 111 in the front-rear direction; the height between the two flow-building elements 17 may be different according to the specific needs of the person skilled in the art.

Referring back to fig. 2, based on the structure of the middle duct assembly 1, the present embodiment further provides a side duct assembly 2 on the battery cluster, and the structure of the side duct assembly 2 is substantially equal to half of the structure of the middle duct assembly 1, that is, the side duct assembly comprises a main board 111 and a side frame 112 surrounding the main board 111, the side frame 112 is provided with a ventilation hole 1121, and the main board 111 and the side frame 112 form a ventilation channel; when the side duct assembly 2 is installed, its side frame 112 is disposed closer to the battery pack than the main plate 111.

It should be noted that the aforementioned description of the side duct assembly 2 is "substantially equivalent to" half of the structure of the middle duct assembly 1, because in the side duct assembly 2, the main board 111 and the side frame 112 are also fixed (by welding or injection molding) together, and are not movably disposed like the main board 111 in the middle duct assembly 1.

It will be appreciated that in other embodiments, the configuration of the side duct assembly 2 may also be substantially equivalent to half of the configuration of the intermediate duct assembly 1 described above; the difference from the half structure of the middle air duct assembly 1 is that the vent 1121 arranged on the side frame 112 is eliminated, and the vent 1121 is arranged on the main board 111; at this time, the main plate 111 is placed closer to the battery pack than the side frame 112.

Example two

This embodiment also provides a battery pack comprising the intermediate duct assembly 1 substantially as described in embodiment one. The difference between this embodiment and the first embodiment is that the main plate 111, the vertical split plate 15, and the flow-making member 17 in this embodiment are all stationary parts. In other words, the first driving member 14, the second driving member 16, and the third driving member 18 are not provided in the present embodiment.

Specifically, the middle air duct assembly 1 of the present embodiment is welded to the battery rack, and the main board 111 and the side frame 112 of the present embodiment are fixed (by welding or injection molding); in this embodiment, the vertical sub-plates 15 in the first main air duct 12 and the second main air duct 13 are fixed together with the main plate 111 and the corresponding side frame 112 (by welding or injection molding); similarly, the flow-making member 17 in this embodiment is fixed (by welding or injection molding) to the main plate 111 or the corresponding side frame 112.

Referring back to fig. 2, based on the structure of the middle air duct assembly 1, the embodiment further includes a side air duct assembly 2 welded to the battery rack on the battery cluster, where the side air duct assembly 2 corresponds to half of the structure of the middle air duct assembly 1; when the side duct assembly 2 is assembled, the side frame 112 having the ventilation hole 1121 is located closer to the battery pack located on the battery cluster with respect to the main plate 111.

Example III

Since there are individual differences between the battery packs and between the battery cells at different positions in the battery packs, in order to ensure that the operation of balancing the temperature at each position in the battery cluster is performed in a seal manner, the present embodiment provides a method for balancing the temperature in the battery cluster (hereinafter referred to as a balancing method).

As described above, the battery cluster in this embodiment is the battery cluster described in embodiment one. Taking the middle air duct assembly 1 as an example, the equalization method provided in this embodiment includes the following steps:

s1, detecting temperatures of two temperature measuring points which are arranged on the same side of the main board 111 and are arranged in tandem; s2 is performed.

For example, as shown in fig. 13, a temperature measuring point a and a temperature measuring point B are respectively located on the right side of the second main air duct 13, and are located at the same height, and before the temperature measuring point a is located at the temperature measuring point B, step S2 may be performed after detecting the temperatures of the temperature measuring point a and the temperature measuring point B.

S2, calculating a temperature difference value between the two temperature measuring points, judging whether the temperature balancing operation is required to be performed on the two temperature measuring points in the S1 according to the temperature difference value, and judging that the temperature balancing operation is required to be performed if the temperature difference value exceeds a first allowable value; s3 is performed.

That is, in the above example, if the temperatures of the temperature measuring point a and the temperature measuring point B are 33 ℃ and 38 ℃ respectively, and the first allowable value is 2 ℃, the temperature difference between the temperature measuring point a and the temperature measuring point B is 5 ℃ greater than the first allowable value, and it is determined that the temperature equalization operation is required; step S3 is performed.

S3, moving at least one vertical sub-plate 15 near one temperature measuring point along the front-back direction according to the temperature relation between the two temperature measuring points so as to change the air quantity passing through the at least one temperature measuring point; s4 is performed.

That is, in the foregoing example, five vertically disposed sub-plates 15 in the second main duct 13 are provided, from front to rear, as the first plate 15a, the second plate 15B, the third plate 15c, the fourth plate 15d, and the fifth plate 15e, respectively, and according to the temperature difference between the temperature measuring points a and B, the fifth plate 15e is optionally moved backward for 5mm to increase the air volume passing through the temperature measuring point B, and then S4 is performed. It will be appreciated that the solution for moving the vertical sub-plate 15 in this step may also be: the fourth plate 15d is selectively moved forward for 5mm, so that the air quantity passing through the temperature measuring point B is increased, and the air quantity passing through the temperature measuring point A is reduced.

S4, after waiting for the first time, recalculating the temperature difference between the temperature measuring points, judging whether the temperature difference exceeds a first allowable value, and if so, executing S5.

That is, following the foregoing example, after waiting twenty minutes, it is recalculated whether the temperature difference between the temperature measurement point a and the temperature measurement point B is less than 2 ℃, and if the temperature difference between the temperature measurement point a and the temperature measurement point B is reduced due to the adjustment of the fifth plate 15e but still exceeds 2 ℃, S5 is performed.

S5, repeatedly executing S3-S4 until the temperature difference between the two temperature measuring points is smaller than a first allowable value.

That is, following the previous example, at least one vertical sub-plate 15 is selected, the at least one vertical sub-plate 15 is moved and wait twenty minutes before re-calculating whether the temperature difference between temperature measurement point a and temperature measurement point B is less than 2 ℃, and the cycle is repeated until the temperature difference between temperature measurement point a and temperature measurement point B is less than 2 ℃.

In a possible embodiment, if the temperature difference between the temperature measurement points in step S4 does not exceed the first allowable value, the process may be directly returned to step S1.

It should be noted that, the above step S3 may be performed manually, and the selection of the vertical sub-plates 15, the moving direction of the vertical sub-plates 15, and the distance of each movement of the vertical sub-plates 15 may be flexibly determined by those skilled in the art according to the current needs.

In light of the above, the selection principles of the vertical split plate 15 include: the vertical split plate 15 with less influence on the number of temperature measurement points is preferentially selected. The selection principle of the moving direction of the vertical separation plate 15 includes: after the vertical separation plate 15 moves, the temperature of the two temperature measuring points can be reduced. The principle of each movement of the vertical sub-plate 15 includes: the higher the temperature difference between the two temperature measuring points exceeds the first allowable value, the greater the distance to move the vertically arranged split plate 15.

Optionally, the equalization method of the present embodiment, the selection principle of the vertical sub-plate 15, the selection principle of the moving direction of the vertical sub-plate 15, and the principle of moving the distance of the vertical sub-plate 15 each time may also be stored in a coding manner in a hardware control system with a physical entity, so that all the above steps are executed by the hardware control system.

Of course, the hardware control system may also be a semi-automatic system. For example: when the vertical sub-plate 15 to be moved needs to be selected, a hardware control system can send a request to an operator, and the vertical sub-plate 15 to be moved and the moving direction of the vertical sub-plate 15 need to be manually selected; meanwhile, the distance of each moving of the vertical sub-plate 15 is designed in advance by a person skilled in the art, for example, the person skilled in the art can design in advance, and when the temperature difference between every two temperature measuring points exceeds the first allowable value by more than 3 ℃, the distance of each moving of the vertical sub-plate 15 is fixed to be 5mm; when the temperature difference between every two temperature measuring points exceeds the first allowable value of 1-3 ℃, the distance for moving the vertical division plate 15 each time is fixed to be 2.5mm.

It can be understood that the balancing method of the present embodiment is suitable for balancing the temperatures of two temperature measurement points located on the same side of the main board 111, and arranged in tandem; naturally, if there are two temperature measurement points that are located on opposite sides (e.g., left and right sides) of the main board 111, the two temperature measurement points are also applicable to the above-mentioned equalization method.

With continued reference to fig. 14, the above-mentioned balancing method is a first balancing method, and similar to the first balancing method, the present embodiment further provides a second method for balancing the temperature in the battery cluster, which includes the following steps:

s1', detecting the temperature of two temperature measuring points (for example, a temperature measuring point A and a temperature measuring point C which are sequentially arranged from top to bottom in FIG. 14) which are positioned on the same side of the main board 111 and are at different heights; executing S2';

s2', calculating a temperature difference between the two temperature measuring points, judging whether the temperature balancing operation is required to be performed on the two temperature measuring points in the S1' according to the temperature difference, and judging that the temperature balancing operation is required to be performed if the temperature difference exceeds a second allowable value (for example, 1 ℃); executing S3';

s3', according to the temperature relation between the two temperature measuring points, at least one flow making piece 17 positioned near at least one temperature measuring point is adjusted along the up-down direction so as to change the air quantity passing through the at least one temperature measuring point; executing S4';

S4', waiting for a second time (20 minutes, for example), recalculating the temperature difference between the two temperature measurement points, judging whether the temperature difference exceeds the allowable temperature difference range, and if not, executing S5';

s5', repeating S3' -S4' until the temperature difference between the two temperature measuring points is smaller than a second allowable value.

In addition to the different positional relationships between the selected temperature measuring points, the above second equalization method refers to the principle of the first equalization method regarding the vertical dividing plate 15 in terms of the selection principle of the flow generating member 17, the selection principle of the moving direction of the flow generating member 17, and the principle of moving the distance of the flow generating member 17 each time.

In this embodiment, the second equalization method is suitable for equalizing the temperature between two temperature measurement points located at the same side of the main board 111 and at different heights and near the current generating element 17. Naturally, if the relationship between the two temperature measurement points is that the two temperature measurement points are respectively located on different sides (for example, left and right sides) of the main board 111 and are located at different heights, the two temperature measurement points are also applicable to the second equalization method.

With continued reference to fig. 15, similar to the first and second equalization methods, the present embodiment further provides a third method for equalizing the temperature in a battery cluster, which includes the following steps:

S1'', detecting the temperatures of two temperature measuring points (for example, a temperature measuring point A and a temperature measuring point D in FIG. 15) which are respectively located on the opposite sides of the main board 111 and are on the same horizontal plane; executing S2';

s2'' calculating a temperature difference between the two temperature measuring points, judging whether the temperature balancing operation is required to be performed on the two temperature measuring points in S1'' according to the temperature difference, and judging that the temperature balancing operation is required to be performed if the temperature difference exceeds a third allowable value (for example, 1 ℃); executing S3';

s3'', according to the temperature relationship between the two temperature measuring points, adjusting the position of the main board 111 along the left-right direction so as to change the air quantity passing through the two temperature measuring points; executing S4'';

s4', waiting for a third time (for example, 20 minutes), recalculating the temperature difference between the two temperature measurement points, judging whether the temperature difference exceeds a third allowable value, and if not, executing S5' ';

s5', repeatedly executing S3' -S4' until the temperature difference between the two temperature measuring points is smaller than a third allowable value.

In this embodiment, the third equalization method is suitable for equalizing the temperatures between two temperature measurement points respectively located on opposite sides of the main board 111 and on the same horizontal plane.

Based on the above description, based on the above three equalization methods, a person skilled in the art can correspondingly equalize the cooling rate, the air receiving volume and the temperature of the battery pack in the battery cluster in the up-down, front-back and left-right directions by means of manual operation or automatic operation, so as to further ensure the temperature difference equalization in the whole system of the battery cluster.

In addition, there is no specific operation sequence among the three equalization methods, and if equalization operations in at least two directions of up-down, front-back, and left-right are all required, a person skilled in the art can flexibly determine the sequence of implementing the three equalization methods as required.

In summary, according to the invention, the vertical sub-plates 15 are disposed in the channels formed by the main plate 111 and the side frame 112 to form at least two sub-channels, and the length of the front sub-channel in the front-rear direction is smaller than that of the last sub-channel in the front-rear direction, so that the beneficial effects of balancing the cooling efficiency and the temperature of each battery cluster in the front-rear direction can be achieved, the problem of service life of the battery cells near the rear of the battery cluster in the battery pack is not easy to occur, and the safety of the battery cluster in a working scene is indirectly improved.

Further, by further providing the main board 111 in the middle duct assembly 1 to form the first main duct 12 and the second main duct 13 corresponding to the battery packs on the left and right sides of the battery cluster, the invention balances the cooling efficiency, the temperature and the air receiving quantity of the battery packs in the left and right side of the battery cluster in the left and right directions.

Further, by providing the flow-creating member 17 in the passage defined by the main plate 111 and the side frame 112 to form the flow-creating region 171, the present invention can also equalize the cooling rate, temperature and air-receiving amount between the battery packs located at the upper, lower and middle portions of the battery cluster, that is, equalize the cooling rate, temperature and air-receiving amount between the battery packs in the up-down direction.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. The air duct assembly is characterized by being arranged on a battery frame to enable an air supply device to supply air to a battery pack; the air duct assembly comprises a framework (11), wherein the framework (11) comprises a main board (111) and side frames (112) arranged on the side edges of the main board (111), and the main board (111) and the side frames (112) enclose a channel for ventilation; one of the side frame (112) and the main board (111) is provided with a vent hole (1121), and the vent hole (1121) is used for enabling wind to go to the battery pack from the channel; the air duct assembly further comprises a vertical separation plate (15); the vertical sub-plate (15) is arranged in an extending manner along the up-down direction, is positioned between the side frame (112) and the main plate (111) and divides the channel into a plurality of sub-air channels, the plurality of sub-air channels are sequentially arranged from front to back, and the length of the sub-air channel positioned at the forefront side in the front-rear direction is smaller than the length of the sub-air channel positioned at the rearmost side in the front-rear direction;

The air duct assembly further comprises a plurality of flow-making pieces (17); in the up-down direction, the flow-making piece (17) divides at least one part of the channel into a plurality of different flow-making areas (171) so as to prevent part of wind entering the flow-making areas (171) from descending and enable the wind to strike on the flow-making piece (17) to form backflow and accumulation of the wind;

a portion of the vertically placed sub-plate (15) is penetrated in the front-rear direction, thereby forming an avoidance area (174); the flow-making member (17) is formed by extending in the front-rear direction, is positioned between the side frame (112) and the main plate (111), and penetrates the avoidance region (174).

2. The duct assembly of claim 1, wherein the lengths of the plurality of branch ducts in the fore-and-aft direction are sequentially increased.

3. The duct assembly of claim 1, wherein the frame (11) includes two-numbered side frames (112), the two-numbered side frames (112) being respectively located on opposite sides of the main plate (111) and connected to each other; the main board (111) and one of the two side frames (112) enclose a first main air channel (12), and the other of the two side frames (112) encloses a second main air channel (13); the first main air duct (12) and the second main air duct (13) are internally provided with a vertical separating plate (15) and a flow-making piece (17).

4. A duct assembly according to claim 3, characterized in that the duct assembly further comprises a fixedly arranged first (14), second (16) and third (18) drive member; the first driving piece (14) is configured to drive the main board (111) to move left and right, and change the ventilation quantity of the first main air duct (12) and the second main air duct (13); the second driving piece (16) is configured to drive the vertical sub-plate (15) to move back and forth, and change the ventilation quantity of the sub-air duct; the third driving piece (18) is configured to drive the flow-making piece (17) to move up and down, and change the shape of the flow-making area (171).

5. The air duct assembly according to claim 4, characterized in that there is a space between each vertical sub-plate (15) and the main plate (111); in the air duct assembly, the first driving piece (14) drives the main board (111) to move left and right in the interval; the first driving piece (14) is fixed on a side frame (112) and is fixedly connected with the main board (111); the second driving piece (16) is fixed on the main board (111) and fixedly connected with the vertical sub-board (15); the third driving piece (18) is fixed on the main board (111) and fixedly connected with the flow-making piece (17).

6. A battery pack comprising the duct assembly of any of claims 1-5.

7. A battery pack comprising two rows of battery packs, a battery rack and the air duct assembly of claim 3; the duct assembly of claim 3, located between the two rows of battery packs, each of the two rows of battery packs comprising a plurality of battery packs disposed in sequence in an up-down direction on the battery rack.

8. A method of equalizing the temperature within a battery cluster using the battery cluster of claim 6, comprising the steps of:

s1, detecting temperatures of two temperature measuring points arranged in tandem; s2, executing;

s2, calculating a temperature difference value between the two temperature measuring points, and judging whether temperature balancing operation is required to be carried out on the two temperature measuring points in the S1 according to the temperature difference value; if the temperature difference value exceeds a first allowable value, judging that temperature equalization operation is required; s3, executing;

s3, moving at least one vertical separation plate (15) near at least one temperature measuring point along the front-back direction according to the temperature relation between the two temperature measuring points so as to change the air quantity passing through the at least one temperature measuring point; s4, executing;

S4, recalculating the temperature difference between the two temperature measuring points after waiting for the first time, judging whether the temperature difference exceeds a first allowable value, and if so, executing S5;

s5, repeatedly executing S3-S4 until the temperature difference between the two temperature measuring points is smaller than a first allowable value.

9. A method of equalizing the temperature within a battery cluster, wherein the battery cluster comprises the duct assembly of claim 1, the method of equalizing the temperature within a battery cluster comprising the steps of:

s1', detecting the temperatures of two temperature measuring points at different heights; executing S2';

s2', calculating a temperature difference value between the two temperature measuring points, judging whether temperature balancing operation is required to be performed on the two temperature measuring points in the S1' according to the temperature difference value, and judging that the temperature balancing operation is required to be performed if the temperature difference value exceeds a second allowable value; executing S3';

s3', according to the temperature relation between the two temperature measuring points, at least one flow making piece (17) positioned near at least one temperature measuring point is adjusted along the up-down direction so as to change the air quantity passing through the at least one temperature measuring point; executing S4';

s4', waiting for a second time, recalculating a temperature difference value between the two temperature measuring points, judging whether the temperature difference value exceeds a second allowable value, and if not, executing S5';

S5', repeating S3' -S4' until the temperature difference between the two temperature measuring points is smaller than a second allowable value.