Air-cooled battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses an air-cooled battery pack which comprises a box shell, a fan, a first air guide channel, a second air guide channel and a blocking piece, the first air guide channel extends in the first direction of the box shell and directly communicates with a second air opening, and the second air guide channel communicates with the first air guide channel and a first air opening; the blocking piece is arranged in the first air guide channel and extends in the first direction, the blocking piece is provided with a first air guide face and a second air guide face, and the first air guide face and the second air guide face gradually incline in the direction away from each other from the direction where the second air opening is located to the direction away from the second air opening. The first air guide surface and the second air guide surface not only can solve the problem of convection after opposite air intake of the side plates of the box shell, but also can enable the airflow velocity far away from the fan in the first air guide channel to be greater than the airflow velocity close to the fan, so that the problem that the battery cells close to the fan are overheated can be avoided, and the temperature consistency of the battery cells in the box shell is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to an air-cooled battery pack. Background Art

[0002] In the related art, an air-cooled battery pack includes a box shell, battery cells and a fan. Among them, a plurality of battery cells are arranged in the box shell. The box shell has an air inlet and an air outlet, and the fan is installed on the box shell and is arranged opposite to the air outlet. When the fan works, the fan extracts the hot air generated by the battery cells in the box shell, and enables the cold air outside to enter the box shell from the air inlet, so as to realize air-cooling the battery cells.

[0003] However, the farther away from the fan, the smaller the suction force of the fan, resulting in a slower air speed at the battery cells farther away from the fan and a lower air-cooling efficiency. In addition, when the box shell has two-way air inlet on the side, two airflows in opposite directions will generate a large air resistance in the box shell, affecting the air flow, and further resulting in a reduction in air-cooling efficiency.

[0004] This part provides background information related to the present application, and these background information are not necessarily prior art. Utility Model Content

[0005] The purpose of the present application is to provide an air-cooled battery pack, which can improve the air-cooling efficiency and the safety of the battery pack.

[0006] In order to achieve the above object, the present application adopts the following technical solutions:

[0007] An air-cooled battery pack, comprising:

[0008] A box shell, the end plate of the box shell has a first air outlet and a second air outlet;

[0009] A fan, installed at the second air outlet;

[0010] A first air guide channel and second air guide channels located on both sides of the first air guide channel. The first air guide channel extends along a first direction of the box shell and is directly communicated with the second air outlet. The second air guide channels communicate the first air guide channel and the first air outlet;

[0011] A barrier member, arranged in the first air guide channel and extending along the first direction. The barrier member has a first air guide surface and a second air guide surface. From the direction where the second air outlet is located to the direction away from the fan, the first air guide surface and the second air guide surface gradually incline away from each other.

[0012] As an alternative to the air-cooled battery pack, the barrier member includes a first partition and a second partition arranged at an acute angle. The surface of the first partition facing away from the second partition forms the first air guiding surface, and the surface of the second partition facing away from the first partition forms the second air guiding surface.

[0013] As an alternative to the air-cooled battery pack, the first air guiding surface and the second air guiding surface are arranged axially symmetrically about the center line of the first air guiding channel.

[0014] As an alternative to the air-cooled battery pack, the air-cooled battery pack further includes a sealing plate, which includes a first closing portion and a second closing portion. The first closing portion extends along the first direction and is used to close the upper end of the barrier member; the second closing portion extends along the height direction and is used to close the open end of the barrier member; the lower end of the barrier member is in sealing cooperation with the bottom plate of the box shell.

[0015] As an alternative to the air-cooled battery pack, the upper ends of the first partition and / or the second partition both have first clamping protrusions, and the first closing portion has first clamping grooves that are in clamping cooperation with the first clamping protrusions; and / or

[0016] The upper ends of the first partition and / or the second partition both have second clamping protrusions, and the second closing portion has second clamping grooves that are in clamping cooperation with the second clamping protrusions.

[0017] As an alternative to the air-cooled battery pack, the air-cooled battery pack further includes a plurality of battery cells. The plurality of battery cells are divided into two groups of battery cell groups arranged at intervals. The sealing plate, the bottom plate of the box shell, and the sides of the battery cell groups cooperate to enclose the air guiding cavity of the first air guiding channel.

[0018] As an alternative to the air-cooled battery pack, the air-cooled battery pack further includes a sealing gasket, and the sealing gasket is provided between the side of the battery cell group and the sealing plate.

[0019] As an alternative to the air-cooled battery pack, the air-cooled battery further includes an air duct. The air duct has an air channel communicating the first air inlet and the first air guiding channel, and the air channel forms the air guiding cavity of the second air guiding channel.

[0020] As an alternative to the air-cooled battery pack, a single air duct has a plurality of air channels arranged along the height direction of the box shell.

[0021] As an alternative to the air-cooled battery pack, the air-cooled battery pack further includes a plurality of battery cells. The plurality of battery cells are divided into two groups of battery cell groups. In the same group of battery cell groups, there is an air duct between adjacent two battery cells.

[0022] The beneficial effects of this application are as follows:

[0023] The air-cooled battery pack provided by the present application includes a case, a fan, a first air guiding channel, a second air guiding channel, and a barrier. The first air guiding channel extends along a first direction of the case and is directly communicated with a second air outlet. The second air guiding channel communicates the first air guiding channel with a first air inlet. The barrier is disposed in the first air guiding channel and extends along the first direction. The barrier has a first air guiding surface and a second air guiding surface. From the direction where the second air outlet is located to the direction away from the second air outlet, the first air guiding surface and the second air guiding surface gradually incline away from each other. The first air guiding surface and the second air guiding surface can not only solve the convection problem after the side plates of the case intake air in opposite directions, but also enable the air flow velocity at a position far from the fan in the first air guiding channel to be greater than that at a position close to the fan, which can avoid the problem of overheating of the battery cells close to the fan and ensure the consistency of the temperatures of the battery cells in the case. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present application and these drawings.

[0025] Figure 1 shows a schematic structural diagram of the air-cooled battery pack provided by the present application;

[0026] Figure 2 shows Figure 1 a schematic cross-sectional view of the air-cooled battery pack in one direction;

[0027] Figure 3 shows Figure 1 a schematic cross-sectional view of the air-cooled battery pack in another direction;

[0028] Figure 4 shows Figure 3 an exploded schematic diagram of the barrier and the sealing plate in ;

[0029] REFERENCE SIGNS:

[0030] 100, first air guiding channel; 200, second air guiding channel;

[0031] 1, case; 11, end plate; 111, second air outlet; 12, side plate; 121, first air inlet;

[0032] 2, fan;

[0033] 3, battery cell;

[0034] 4. Barrier; 41. First partition; 411. First convex; 412. Second convex; 41a. First air guiding surface; 42. Second partition; 42a. Second air guiding surface;

[0035] 5. Sealing plate; 51. First closed part; 52. Second closed part; 53. Third closed part;

[0036] 6. Sealing gasket;

[0037] 7. Fixed bracket;

[0038] 8. Air duct; 81. Air passage. Detailed implementation mode

[0039] Before explaining any implementation mode of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements described in the following description or shown in the above drawings.

[0040] In the present application, the terms "include", "comprise", "have" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0041] In the present application, the term "and / or" is a relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the present application, the character " / " generally represents an "and / or" relationship between the associated objects before and after.

[0042] In the present application, the terms "connect", "combine", "couple", "install" may be direct connection, combination, coupling or installation, or may be indirect connection, combination, coupling or installation. Among them, by way of example, direct connection means that two parts or components are connected together without setting an intermediate piece, and indirect connection means that two parts or components are respectively connected to at least one intermediate piece, and these two parts or components are connected through the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connection or coupling, and may include electrical connection or coupling.

[0043] In this application, those of ordinary skill in the art will understand that relative terms used in connection with quantities or conditions (e.g., "about", "approximately", "substantially", etc.) are intended to include the recited value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances resulting from manufacturing, assembly, use in relation to a particular value, etc. Such terms should also be considered to disclose ranges defined by the absolute values of two endpoints. The relative term may refer to a plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values that do not employ relative terms should also be disclosed as specific values with tolerances. In addition, when expressing relative angular positional relationships (e.g., substantially parallel, substantially perpendicular), "substantially" may refer to a plus or minus a certain number of degrees (e.g., 1 degree, 5 degrees, 10 degrees or more) from the indicated angle.

[0044] In this application, those of ordinary skill in the art will understand that the functions performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0045] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", "rear", etc. are described based on the orientation and positional relationship shown in the drawings, and should not be construed as limiting the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that the orientation terms such as the upper side, the lower side, the left side, the right side, the front side, the rear side, etc. not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front, and lower rear, etc.

[0046] Figure 1 The structural schematic diagram of the air-cooled battery pack provided by this application is shown. Figure 2 is shown Figure 1 the cross-sectional schematic diagram of the air-cooled battery pack in one direction. As Figures 1 to 2 shown, the air-cooled battery pack provided by this application includes a box shell 1, a fan 2, and a plurality of battery cells 3. The plurality of battery cells 3 are installed in the box shell 1; the box shell 1 has a first air inlet 121 and a second air outlet 111; the fan 2 is installed at the second air outlet 111 and is used to draw away the hot air in the box shell 1 and enable the cold air outside to enter the box shell 1, so as to realize air-cooling the battery cells 3 in the box shell 1. Among them, the first air inlet 121 is the air inlet, and the second air outlet 111 is the air outlet.

[0047] The multiple battery cells 3 are divided into two groups of battery cell groups, and the two groups of battery cell groups are arranged at intervals along the second direction of the box housing 1. Each group of battery cell groups has multiple battery cells 3 arranged at intervals along the first direction of the box housing 1. At least one first air inlet 121 is correspondingly arranged at the interval between two adjacent battery cells 3. When the fan 2 works, external air enters the interval between two adjacent battery cells 3 from the first air inlet 121, then flows to the interval between the two groups of battery cell groups, and finally is discharged from the second air outlet 111 under the action of the fan 2, so as to realize air-cooling the temperature of all the battery cells 3.

[0048] The air-cooled battery pack further includes a first air guiding channel 100 and a second air guiding channel 200. The first air guiding channel 100 extends along the first direction of the box housing 1 and is directly communicated with the second air outlet 111. The second air guiding channel 200 is used to communicate the first air guiding channel 100 and the first air inlet 121. When the fan 2 works, external air enters from the first air inlet 121, enters the first air guiding channel 100 after flowing through the second air guiding channel 200, and finally is discharged from the second air outlet 111, so as to realize air-cooling the temperature of all the battery cells 3.

[0049] In an embodiment, the first end of the first air guiding channel 100 is in sealing fit with the periphery of the second air outlet 111, and the second end of the first air guiding channel 100 is closed, so as to ensure that the air flow in the first air guiding channel 100 can only be discharged from the fan 2 at the second air outlet 111, and cannot flow to other spaces in the box housing 1, thereby avoiding the situation that the air flow cannot be discharged from the box housing 1 due to internal air short circuit, avoiding local overheating of the temperature in the box housing 1, and improving the air-cooling efficiency.

[0050] Continue to refer to Figure 2, the air-cooled battery pack further includes a barrier member 4 disposed in the first air guiding channel 100 and extending along the first direction. The barrier member 4 has a first air guiding surface 41a and a second air guiding surface 42a. From the direction where the second air outlet 111 is located to the direction away from the second air outlet 111, the first air guiding surface 41a and the second air guiding surface 42a gradually incline away from each other. The first air guiding surface 41a and the second air guiding surface 42a have the following effects: First, after the side faces face the incoming air, it can flow by itself along the inclination directions of the first air guiding surface 41a and the second air guiding surface 42a, solving the problem that the suction force of the fan 2 is smaller at positions farther away from the fan 2; second, it solves the convection problem caused by the side faces facing the air; third, the farther away from the fan 2, the smaller the distance between the battery cell 3 and the first air guiding surface 41a or the second air guiding surface 42a, that is, the smaller the flow area of the air flow. According to the flow principle, the smaller the area, the faster the flow rate. That is, the cooling air flow rate at the rear part (the end far away from the fan 2) of the battery pack is faster, and the hot air after heat exchange at the rear part will be preferentially discharged from the cooling air flow of the battery cells 3 at the front part (the end close to the fan 2), greatly reducing the contact time between the hot air after heat exchange of the battery cells 3 at the rear part and the battery cells 3 at the front part, avoiding the problem of overheating of the battery cells 3 at the front part, and ensuring the consistency of the temperature of the battery cells 3 in the housing 1.

[0051] The barrier member 4 includes a first partition plate 41 and a second partition plate 42 arranged at an acute angle. The surface of the first partition plate 41 facing away from the second partition plate 42 forms the first air guiding surface 41a, and the surface of the second partition plate 42 facing away from the first partition plate 41 forms the second air guiding surface 42a. Further, the first air guiding plate and the second air guiding plate are arranged axially symmetrically about the center line of the first air guiding channel 100 to ensure that the air cooling efficiency of the two groups of battery cell groups is equivalent.

[0052] Figure 3 shows Figure 1 a cross-sectional schematic view of the air-cooled battery pack in another direction. As Figure 3 shown, the housing 1 includes end plates 11, side plates 12, a bottom plate and a top plate. The bottom plate and the top plate are oppositely arranged. The two end plates 11 are spaced apart at both ends of the bottom plate and the top plate in the first direction, and the two side plates 12 are spaced apart at both ends of the bottom plate and the top plate in the second direction.

[0053] In one embodiment, the two side plates 12 and the bottom plate are integrally formed, and then the two end plates 11 are detachably fixed to the side plates 12 and the bottom plate, thereby forming a frame structure with an open upper end. Then the top plate is detachably fixed to the open end of the frame structure, thereby forming the housing 1. In another embodiment, the two side plates 12, the two end plates 11 and the bottom plate are an integrally formed frame structure, and the top plate is detachably installed at the open end of the frame structure.

[0054] The air-cooled battery pack further includes a sealing plate 5, which includes a first closing part 51 and a second closing part 52. The first closing part 51 extends along the first direction and is used to close the upper end of the barrier 4, and the second closing part 52 extends along the height direction and is used to close the open end of the barrier 4. The lower end of the barrier 4 is in sealing cooperation with the bottom plate of the box shell 1, so as to prevent air flow from entering the V-shaped cavity of the barrier 4.

[0055] Figure 4 shows Figure 3 an exploded schematic view of the barrier 4 and the sealing plate 5 in. As Figure 4 shown in combination with Figure 3 the upper ends of the first partition 41 and the second partition 42 have first convexities 411, and the first closing part 51 of the sealing plate 5 has a first card slot that cooperates with the first convexity 411. The upper ends of the first partition 41 and / or the second partition 42 both have second convexities 412, and the second closing part 52 has a second card slot that is in snap-fit cooperation with the second convexity 412. Through the cooperation of the convexity and the card slot, the sealing plate 5 can be fixedly connected to the barrier 4. Specifically, the number of convexities of the barrier 4 is multiple, and the number of card slots of the first closing part 51 of the sealing plate 5 is the same as that of the convexities, and they are arranged in one-to-one correspondence.

[0056] Furthermore, the sealing plate 5 further includes a third closing part 53, and the third closing part 53 is hermetically disposed around the periphery of the second air outlet 111 (i.e., the fan 2) to ensure that the air flow in the first air guiding channel 100 can only be discharged from the second air outlet 111 and will not flow to other spaces inside the box shell 1.

[0057] The air-cooled battery pack further includes a gasket 6, and a gasket 6 is provided between the side surface of the battery cell group and the sealing plate 5. Specifically, the number of gaskets 6 is two, and each battery cell group and the air guiding plate have this gasket 6. The gasket 6 can be selected as a rubber sealing member, etc., and will not be exemplified one by one here.

[0058] Furthermore, the air-cooled battery pack further includes fixing brackets 7. The two fixing brackets 7 are respectively located at both ends of the battery cell group in the first direction, and the fixing brackets 7 are fixed on the bottom plate of the box shell 1. One of the fixing brackets 7 is used to support and install the third closing part 53 of the sealing plate 5, and the other fixing bracket 7 is used to support and install the second closing part 52 of the sealing plate 5.

[0059] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form. Any technical solutions obtained by using equivalent replacements or equivalent transformations fall within the protection scope of the present application.

Claims

1. An air-cooled battery pack, characterized in that: include: A box shell (1), wherein the box shell (1) has a first air outlet (121) and a second air outlet (111); A fan (2) installed at the second air outlet (111); a first air guiding channel (100) and second air guiding channels (200) located on both sides of the first air guiding channel (100), the first air guiding channel (100) extending along a first direction of the housing (1) and directly communicating with the second air outlet (111), and the second air guiding channel (200) communicating with the first air guiding channel (100) and the first air outlet (121); A blocking member (4) is arranged in the first air guide channel (100) and extends along the first direction, the blocking member (4) having a first air guide surface (41a) and a second air guide surface (42a), and from the direction where the second air outlet (111) is located to the direction away from the fan (2), the first air guide surface (41a) and the second air guide surface (42a) gradually incline in a direction away from each other.

2. The air-cooled battery pack according to claim 1, characterized in that: The barrier (4) comprises a first partition (41) and a second partition (42) arranged at an acute angle, wherein a surface of the first partition (41) facing away from the second partition (42) forms the first wind guide surface (41a), and a surface of the second partition (42) facing away from the first partition (41) forms the second wind guide surface (42a).

3. The air-cooled battery pack according to claim 2, characterized in that: The first wind guiding surface (41a) and the second wind guiding surface (42a) are arranged in an axisymmetric manner with the center line of the first wind guiding channel (100) as the center.

4. The air-cooled battery pack according to claim 2, characterized in that: The air-cooled battery pack also includes a sealing plate (5), and the sealing plate (5) includes a first sealing portion (51) and a second sealing portion (52), wherein the first sealing portion (51) extends along the first direction and is used to seal the upper end of the barrier (4); the second sealing portion (52) extends along the height direction and is used to seal the open end of the barrier (4); the lower end of the barrier (4) is sealed with the bottom plate of the box shell (1).

5. The air-cooled battery pack according to claim 4, characterized in that: The upper ends of the first partition plate (41) and / or the second partition plate (42) are each provided with a first locking protrusion (411), and the first closing portion (51) is provided with a first locking groove that is engaged with the first locking protrusion (411); and / or The upper ends of the first partition plate (41) and / or the second partition plate (42) are both provided with a second latching protrusion (412), and the second closing portion (52) is provided with a second latching groove that is latched with the second latching protrusion (412).

6. The air-cooled battery pack according to claim 4, characterized in that: The air-cooled battery pack further comprises a plurality of battery cells (3), wherein the plurality of battery cells (3) are divided into two groups of battery cell groups which are spaced apart from each other, and the sealing plate (5), the bottom plate of the box shell (1) and the side surfaces of the battery cell groups cooperate to enclose an air guide cavity forming the first air guide channel (100).

7. The air-cooled battery pack according to claim 6, characterized in that: The air-cooled battery pack further comprises a sealing gasket (6), and the sealing gasket (6) is provided between the side surface of the battery cell group and the sealing plate (5).

8. The air-cooled battery pack according to any one of claims 1 to 7, characterized in that: The air-cooled battery further comprises an air duct (8), wherein the air duct (8) has an air channel (81) communicating with the first air port (121) and the first air guide channel (100), and the air channel (81) forms an air guide cavity of the second air guide channel (200).

9. The air-cooled battery pack according to claim 8, characterized in that: A single air duct (8) has a plurality of air ducts (81) arranged along the height direction of the box shell (1).

10. The air-cooled battery pack according to claim 8, characterized in that: The air-cooled battery pack further comprises a plurality of battery cells (3), wherein the plurality of battery cells (3) are divided into two groups of battery cells, and in the same group of battery cells, the air duct (8) is provided between two adjacent battery cells (3).

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