Battery pack and car

Abstract

The present application relates to a battery pack and a car, the battery pack includes a tray, a flow channel plate and a cover plate, the flow channel plate is installed on the bottom wall of the tray, the flow channel plate has a first recessed portion, the first recessed portion is recessed toward the direction close to the bottom wall of the tray, the cover plate is arranged on the side of the flow channel plate away from the bottom wall of the tray, and is spaced and surrounded by the first recessed portion to form a flow channel, the flow channel is used for the circulation of coolant; wherein, the height of the flow channel is H1, the thickness of the flow channel plate is T1, and 1.5T1≤H1≤4T1. The battery pack provided by the present application ensures that the battery pack structure has sufficient structural strength while allowing the coolant to have a suitable flow rate and flow velocity in the flow channel.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0002] The battery pack provides the driving force for new energy vehicles. The battery pack usually includes a tray, a battery cell module and a cold plate. The cold plate is formed by the upper flow channel plate and the lower flow channel plate. The cold plate is fixed in the box, and the battery cell module is glued to the cold plate by glue, so as to achieve the fixation, cooling and heating functions of the battery cell module. The flow channel is formed by stamping on the upper flow channel or the lower flow channel. The flow channel is used for the flow of coolant. How to ensure that the battery pack has sufficient structural strength while making the coolant have a suitable flow rate and flow velocity in the flow channel is a problem that needs to be solved. Utility Model Content

[0003] Based on this, it is necessary to provide a battery pack that can ensure that the battery pack structure has sufficient structural strength while allowing the coolant to have an appropriate flow rate and flow rate in the flow channel.

[0004] A battery pack includes a tray, a flow channel plate and a cover plate. The flow channel plate is installed on the bottom wall of the tray. The flow channel plate has a first recessed portion, which is recessed in a direction close to the bottom wall of the tray. The cover plate is arranged on the side of the flow channel plate away from the bottom wall of the tray, and is spaced apart from and surrounded by the first recessed portion to form a flow channel. The flow channel is used for circulating cooling liquid. The thickness of the flow channel plate is T1, and the height of the flow channel along the thickness direction of the flow channel plate is H1, and 1.5T1≤H1≤4T1.

[0005] In one embodiment, the thickness of the bottom wall of the tray is T2, and the thickness of the cover plate is T3, wherein T2<T1; and / or T3<T1.

[0006] In one of the embodiments, the flow channel plate further has a second recessed portion, which is recessed in a direction close to the bottom wall of the tray, and one side of the second recessed portion is connected to the bottom wall of the tray, and the other side of the second recessed portion is spaced apart and surrounded by the cover plate to form a cavity structure; wherein, along the thickness direction of the flow channel plate, the height of the cavity structure is H2, and H1≤4T1<H2.

[0007] In one embodiment, the thickness of the bottom wall of the tray is T2, and the thickness of the cover is T3, wherein T2<T1, and T3<T1, the spacing between the two sides of the cover and the bottom wall of the tray facing away from each other is L, and the safety factor of the battery pack is defined as α, wherein L>7αT1.

[0008] In one embodiment, 1.2≤α<1.5.

[0009] In one embodiment, the first recessed portion and the second recessed portion are disposed parallel to each other and are staggered along a preset direction.

[0010] In one embodiment, the battery pack also includes a battery cell module, which is installed on the side of the cover plate facing away from the flow channel plate; wherein the area of ​​the side of the cover plate used to install the battery cell module is S1, the actual contact area between the battery cell module and the flow channel plate is S2, the projection area of ​​the flow channel plate on the bottom wall of the tray is S3, and S2<S1<S3.

[0011] In one embodiment, the flow channel plate includes a main board and a flange, wherein the flange is disposed around the circumference of the main board and connected to the side wall of the tray.

[0012] In one embodiment, the cover plate, the flow plate and the tray are all made of steel, and the cover plate is welded to the flow plate, and the flow plate is welded to the tray; or, the cover plate is made of aluminum, and the flow plate and the tray are all made of steel, and the cover plate is bonded to the flow plate, and the flow plate and the tray are welded.

[0013] A car comprises the battery pack described in any one of the above embodiments.

[0014] Compared with the prior art, the battery pack and automobile provided in the present application have a larger flow channel height H1. When the flow channel width is the same, the flow rate of the coolant in the flow channel is larger, which is more conducive to heat exchange with the battery cell module. However, if the flow channel height H1 is too large, the depth of the first recessed portion needs to be deeper, making the flow channel plate weaker. Moreover, when the flow channel width and the coolant inlet pressure are the same, if the flow channel height H1 is too large, the flow rate of the coolant in the flow channel will slow down, which is not conducive to taking away the heat of the battery cell module. Therefore, by setting 1.5T1≤H1≤4T1, it is beneficial to ensure that the coolant flowing through the flow channel has sufficient flow and appropriate flow rate, and also makes the flow channel plate have a sufficiently large structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 An exploded view of the battery pack provided for this application;

[0017] Figure 2 A top view of the tray provided for this application;

[0018] Figure 3A top view of the flow channel plate provided for this application;

[0019] Figure 4 A top view of the battery pack provided for this application;

[0020] Figure 5 for Figure 4 Sectional view at AA;

[0021] Figure 6 for Figure 5 Enlarged schematic at B.

[0022] Figure numerals: 100, battery pack; 10, tray; 20, flow channel plate; 21, first recessed portion; 22, flow channel; 23, second recessed portion; 24, cavity structure; 25, main board; 26, flange; 30, cover plate; 31, water inlet; 32, water outlet. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0028] See also Figures 1 to 6 , and the present application provides a battery pack 100. The battery pack 100 includes a tray 10, a flow channel plate 20, a cover plate 30 and a battery cell module. Among them, Figure 1 An exploded view of the battery pack 100 provided in this application; Figure 2 A top view of the tray 10 provided for this application; Figure 3 A top view of the flow channel plate 20 provided in this application; Figure 4 A top view of the battery pack 100 provided in this application; Figure 5 for Figure 4 Sectional view at AA; Figure 6 for Figure 5 Enlarged schematic at B.

[0029] Specifically, the flow channel plate 20 is installed on the bottom wall of the tray 10, and the flow channel plate 20 has a first recessed portion 21, which is recessed toward the direction close to the bottom wall of the tray 10. The cover plate 30 is installed on the side of the flow channel plate 20 away from the bottom wall of the tray 10, and is spaced and surrounded by the first recessed portion 21 to form a flow channel 22, and the flow channel 22 is used for the circulation of the coolant. Among them, the thickness of the flow channel plate 20 is T1, and along the thickness direction of the flow channel plate 20, the height of the flow channel 22 is H1, and 1.5T1≤H1≤4T1. The battery cell module is installed on the side of the cover plate 30 away from the flow channel plate 20.

[0030] It is understandable that the larger the height H1 of the flow channel 22, the larger the flow rate of the coolant in the flow channel 22 when the width of the flow channel 22 is the same, which is more conducive to heat exchange with the battery cell module. However, if the height H1 of the flow channel 22 is too large, the deeper the depth of the first recessed portion 21 needs to be, making the flow channel plate 20 weaker. Moreover, when the width of the flow channel 22 and the coolant inlet pressure are the same, if the height H1 of the flow channel 22 is too large, the flow rate of the coolant in the flow channel 22 will slow down, which is not conducive to taking away the heat of the battery cell module. Therefore, by setting 1.5T1≤H1≤4T1, it is conducive to ensuring that the coolant flowing through the flow channel 22 has sufficient flow and appropriate flow rate, and also makes the flow channel plate 20 have a sufficiently large structural strength. Specifically, the first recessed portion 21 can be processed on the flow channel plate 20 by stamping.

[0031] Preferably, the value of H1 is 1.5T1, 2T1, 2.5T1, 3T1, 3.5T1, 4T1, etc. Of course, within the range, the value of H1 is not limited thereto, and it can be set and selected according to actual conditions.

[0032] The thickness of the bottom wall of the tray 10 is T2, and the thickness of the cover plate 30 is T3, wherein T2<T1; and / or, T3<T1. That is, in a battery pack 100, there are three size relationships between T1, T2 and T3, namely, T2<T1; or, T3<T1; or, T2<T1 and T3<T1. Since the first recessed portion 21 needs to be formed on the flow channel plate 20, it is necessary to make the first recessed portion 21 thicker and make the cover plate 30 and the bottom wall of the tray 10 thinner, which is beneficial to reduce the overall weight of the battery pack 100.

[0033] Optionally, in one embodiment, the cover plate 30, the flow channel plate 20 and the tray 10 are all made of steel, and the cover plate 30 is welded to the flow channel plate 20, and the flow channel plate 20 is welded to the tray 10. Alternatively, in another embodiment, the cover plate 30 is made of aluminum, the flow channel plate 20 and the tray 10 are both made of steel, and the cover plate 30 is bonded to the flow channel plate 20, and the flow channel plate 20 is welded to the tray 10. In this way, the cover plate 30, the flow channel plate 20 and the tray 10 can be connected to form a whole without a connector, which is not only more convenient to assemble, but also saves space in the battery pack, thereby reserving more space for installing other components.

[0034] See also Figure 5 and Figure 6, the flow channel plate 20 also has a second recessed portion 23, the second recessed portion 23 is recessed in the direction close to the bottom wall of the tray 10, and one side of the second recessed portion 23 is connected to the bottom wall of the tray 10, and the other side is spaced and surrounded by the cover plate 30 to form a cavity structure 24. Among them, along the thickness direction of the flow channel plate 20, the height of the cavity structure 24 is H2, and H1≤4T1<H2. It can be understood that the second recessed portion 23 is used to form a support between the tray 10 and the cover plate 30. The higher the height H2 of the cavity structure 24, the larger the spacing between the cover plate 30 and the flow channel plate 20, so that there is enough space between the cover plate 30 and the flow channel plate 20 to accommodate flow channels 22 of different specifications. Therefore, by setting H1≤4T1<H2. It is convenient to accommodate flow channels 22 of different specifications between the cover plate 30 and the flow channel plate 20. Specifically, the second recessed portion 23 is formed on the flow channel plate 20 by stamping.

[0035] Furthermore, if Figure 6 As shown, the thickness of the bottom wall of the tray 10 is T2, and the thickness of the cover plate 30 is T3, wherein T2<T1, and T3<T1, the distance between the two sides of the cover plate 30 and the bottom wall of the tray 10 that are away from each other is L, and the safety factor of the battery pack is defined as α, wherein L>7αT1. The distance L between the two sides of the cover plate 30 and the bottom wall of the tray 10 that are away from each other refers to the thickness of the tray 10, the flow channel plate 20 and the cover plate 30 after assembly. L=H2+T1+T2+T3, combined with T2<T1, and T3<T1; and 4T1<H2, it can be seen that L>7T1. In addition, by setting the safety factor, it is beneficial to improve the reliability of the battery pack structure.

[0036] Optionally, 1.2≤α<1.5. For example, the value of α may be 1.2, 1.3, 1.35, 1.4, 1.45, etc. Of course, within its range, the value of α is not limited thereto, and it may be set and selected according to actual conditions.

[0037] In one embodiment, if Figure 3 and Figure 6 As shown, the first recessed portion 21 and the second recessed portion 23 are arranged parallel to each other and staggered along a preset direction. In this way, along the flow direction of the coolant in the flow channel 22, both the left and right sides of the flow channel 22 can be firmly connected to the bottom wall of the tray 10. This makes the flow channel plate 20 more evenly stressed and the connection between the flow channel plate 20 and the tray 10 more firmly.

[0038] Exemplarily, the first recessed portion 21 and the second recessed portion 23 are disposed parallel to each other and are staggered along the width direction of the tray 10 .

[0039] Optionally, in one embodiment, if Figure 1As shown, the flow channel plate 20 includes a main board 25 and a flange 26, wherein the flange 26 is disposed around the main board 25 and connected to the side wall of the tray 10. The flange 26 is used to increase the connection area between the flow channel plate 20 and the tray 10, thereby facilitating the improvement of the firmness of the connection between the flow channel plate 20 and the tray 10. The first recessed portion 21 and the second recessed portion 23 are both provided on the main board 25.

[0040] like Figure 4 As shown, the cover plate 30 is further provided with a water inlet 31 and a water outlet 32 ​​, which are respectively connected to the flow channel 22 for the coolant to flow into the flow channel 22 or for the coolant to flow out of the flow channel 22 .

[0041] In one embodiment, the area of ​​the side of the cover plate 30 for mounting the cell module is S1, the actual contact area between the cell module and the flow channel plate 20 is S2, the projected area of ​​the flow channel plate 20 on the bottom wall of the tray 10 is S3, and S2<S1<S3. That is, S2 / S3<S1 / S3<1, so that the flow channel plate 20 can provide a sufficiently large installation area for the cover plate 30, and the cover plate 30 can provide a sufficiently large installation area for the cell module. And it can be understood that after the capacity of the battery pack is determined, the size of the cell module and the projected area of ​​the flow channel plate 20 on the bottom wall of the tray 10 are fixed values, that is, S2 / S3 is a fixed value, and while satisfying S2 / S3<S1 / S3<1, the smaller the S1 / S3 value, the smaller the cover plate 30, which is more conducive to the lightweighting of the battery pack 100.

[0042] The present application also provides a car, which includes the battery pack 100 described in any one of the above embodiments.

[0043] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: The battery pack comprises a tray (10), a flow channel plate (20) and a cover plate (30), wherein the flow channel plate (20) is mounted on the bottom wall of the tray (10), the flow channel plate (20) has a first recessed portion (21), the first recessed portion (21) is recessed in a direction close to the bottom wall of the tray (10), the cover plate (30) is covered on a side of the flow channel plate (20) away from the bottom wall of the tray (10), and is spaced apart from the first recessed portion (21) and surrounds a flow channel (22), wherein the flow channel (22) is used for circulating a coolant; The thickness of the flow channel plate (20) is T1, and along the thickness direction of the flow channel plate (20), the height of the flow channel (22) is H1, and 1.5T1≤H1≤4T1.

2. The battery pack according to claim 1, characterized in that: The thickness of the bottom wall of the tray (10) is T2, and the thickness of the cover plate (30) is T3, wherein T2<T1; and / or T3<T1.

3. The battery pack according to claim 1, characterized in that: The flow channel plate (20) further comprises a second recessed portion (23), the second recessed portion (23) being recessed in a direction close to the bottom wall of the tray (10), and one side of the second recessed portion (23) being connected to the bottom wall of the tray (10), and the other side of the second recessed portion (23) being spaced apart from and surrounded by the cover plate (30) to form a cavity structure (24); Wherein, along the thickness direction of the flow channel plate (20), the height of the cavity structure (24) is H2, and H1≤4T1<H2.

4. The battery pack according to claim 3, characterized in that: The thickness of the bottom wall of the tray (10) is T2, the thickness of the cover plate (30) is T3, wherein T2<T1, and T3<T1, the distance between the two side surfaces of the cover plate (30) and the bottom wall of the tray (10) that are away from each other is L, and the safety factor of the battery pack is defined as α, wherein L>7αT1.

5. The battery pack according to claim 4, characterized in that: 1.2≤α＜1.5。 6. The battery pack according to claim 3, characterized in that: The first recessed portion (21) and the second recessed portion (23) are arranged parallel to each other and staggered along a preset direction.

7. The battery pack according to claim 1, characterized in that: The battery pack further comprises a battery cell module, wherein the battery cell module is mounted on a side of the cover plate (30) facing away from the flow channel plate (20); The area of ​​the side of the cover plate (30) for mounting the battery cell module is S1, the actual contact area between the battery cell module and the flow channel plate (20) is S2, the projection area of ​​the flow channel plate (20) on the bottom wall of the tray (10) is S3, and S2<S1<S3.

8. The battery pack according to claim 1, characterized in that: The flow channel plate (20) comprises a main plate (25) and a flange (26), wherein the flange (26) is arranged around the circumference of the main plate (25), and the flange (26) is connected to the side wall of the tray (10).

9. The battery pack according to claim 1, characterized in that: The cover plate (30), the flow channel plate (20) and the tray (10) are all made of steel, and the cover plate (30) and the flow channel plate (20) are welded, and the flow channel plate (20) and the tray (10) are welded; Alternatively, the cover plate (30) is made of aluminum, the flow channel plate (20) and the tray (10) are both made of steel, and the cover plate (30) is bonded to the flow channel plate (20), and the flow channel plate (20) and the tray (10) are welded.

10. An automobile, characterized in that: The vehicle comprises a battery pack as described in any one of claims 1 to 9.

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