Battery pack box body

Abstract

The embodiment of the utility model relates to a battery pack box body. The battery pack box body comprises a bottom protection plate, a buffer assembly and a liquid cooling assembly which are sequentially stacked from outside to inside, wherein the liquid cooling assembly is provided with a flow channel for accommodating cooling liquid and is used for supporting a battery cell; the buffer assembly comprises a hard first supporting piece and an elastic first buffer piece, the first supporting piece is connected to the bottom of the liquid cooling assembly, a first gap exists between the first supporting piece and the flow channel, and the first buffer piece is connected between the first supporting piece and the bottom protection plate. According to the battery pack box provided by the embodiment of the invention, the first gap formed between the first supporting piece and the flow channel plays a role in buffering external force, so that the phenomenon of deformation of the flow channel is reduced, and the liquid cooling flow of each branch and the normal work of a liquid cooling system are ensured; in addition, the contact area between the first supporting piece and the liquid cooling assembly is reduced by the first gap between the first supporting piece and the flow channel, so that the transmission speed of heat in the flow channel to the first supporting piece is reduced, and the energy loss is further reduced.

Description

Technical Field

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

[0002] Generally, a liquid cooling plate is set at the bottom of the battery pack box. The coolant circulating in the liquid cooling plate can take away the heat and ensure the performance and service life of the battery pack. However, the liquid cooling plate at the bottom of the battery pack box is easily squeezed and collided by external forces, thus forming pits, which affect the flow of coolant in the liquid cooling plate and affect the heat exchange of the battery cells.

[0003] At present, the conventional method is to add buffer foam at the bottom of the liquid cooling plate, relying on the compression of the foam to buffer the external squeezing force. However, the compression amount of the foam is limited, and the protective effect of the foam on the liquid cooling plate is not ideal. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a battery pack case to solve at least one problem existing in the background technology.

[0005] In a first aspect, an embodiment of the present application provides a battery pack box, comprising a bottom guard plate, a buffer assembly, and a liquid cooling assembly stacked in sequence from outside to inside; wherein:

[0006] The liquid cooling assembly has a flow channel for accommodating a coolant and is used to support the battery cell;

[0007] The buffer component includes a hard first support member and an elastic first buffer member. The first support member is connected to the bottom of the liquid cooling component and has a first gap with the flow channel. The first buffer member is connected between the first support member and the bottom guard plate.

[0008] In combination with the first aspect of the present application, in an optional embodiment, the liquid cooling assembly includes a second support plate and a flow channel plate, the flow channel plate having a flow channel groove and a first connecting portion, the first connecting portion is arranged adjacent to the flow channel groove and is in contact with the second support plate, and the flow channel groove and the second support plate constitute the flow channel.

[0009] In combination with the first aspect of the present application, in an optional embodiment, a avoidance groove and a second connecting portion are provided on a side of the first support member close to the liquid cooling component, the second connecting portion is arranged adjacent to the avoidance groove, the flow channel groove is located in the avoidance groove, and the first gap is formed between the flow channel groove and the avoidance groove, and the second connecting portion is connected to the first connecting portion.

[0010] In conjunction with the first aspect of the present application, in an optional implementation manner, the distance range of the first gap is 1 to 8 mm.

[0011] In combination with the first aspect of the present application, in an optional implementation manner, the thickness of the first support member is in the range of 0.5 to 5 mm.

[0012] In combination with the first aspect of the present application, in an optional embodiment, a first rounded corner is provided between the first connecting portion and the flow channel groove, a second rounded corner is provided between the second connecting portion and the avoidance groove, and the distance range between the first rounded corner and the second rounded corner at its relative position is less than or equal to 15 mm.

[0013] In combination with the first aspect of the present application, in an optional implementation manner, an adhesive area is formed between the first connecting portion and the second connecting portion, and the width of the adhesive area ranges from 5 to 25 mm.

[0014] In combination with the first aspect of the present application, in an optional implementation, the inner surface of the first buffer component matches the shape of the outer surface of the first support component, and the inner surface of the first buffer component is in contact with the outer surface of the first support component.

[0015] In combination with the first aspect of the present application, in an optional implementation manner, the thickness of the first buffer component ranges from 4 to 15 mm.

[0016] In combination with the first aspect of the present application, in an optional embodiment, the battery pack body further includes an adhesive layer, the adhesive layer is connected between the first buffer member and the first support member, and the thickness of the adhesive layer ranges from 0.2 to 2 mm.

[0017] The battery pack case provided in the embodiment of the present application is provided with a first gap between the first support member and the flow channel, so that the first gap can play a buffering role against external force, thereby reducing the deformation of the flow channel, and further ensuring the liquid cooling flow of each branch and the normal operation of the liquid cooling system; in addition, the first gap between the first support member and the flow channel reduces the contact area between the first support member and the liquid cooling component, thereby reducing the speed of heat transfer from the flow channel to the first support member, and further reducing energy loss.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A schematic diagram of a three-dimensional exploded view of a battery pack box provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a battery pack box containing battery cells provided in an embodiment of the present application;

[0022] Figure 3 for Figure 2 A three-dimensional schematic diagram of the cross section at the middle BB;

[0023] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0024] Figure 5 for Figure 2 Partial cross-sectional diagram at BB in the middle.

[0025] Reference numerals:

[0026] 100, battery pack body; 10, liquid cooling assembly; 1a, flow channel; 11, second support plate; 12, flow channel plate; 121, flow channel groove; 122, first connecting portion;

[0027] 20. Buffer assembly; 2a. First gap; 21. First support member; 211. Avoidance groove; 212. Second connecting portion; 22. First buffer member;

[0028] 30. Bottom guard plate; 3a. Second gap; 31. Third connecting portion;

[0029] 200. Side beam; a. Battery cell. DETAILED DESCRIPTION

[0030] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope disclosed in the present application to those skilled in the art.

[0031] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features known in the art are not described; that is, all features of the actual embodiments are not described here, and well-known functions and structures are not described in detail.

[0032] In the drawings, the sizes of layers, regions, elements and their relative sizes may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0033] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present application necessarily has the first element, component, region, layer or part.

[0034] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0035] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0036] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0037] like Figures 1 to 4 As shown, an embodiment of the present application provides a battery pack case, wherein the battery pack case 100 includes a bottom guard plate 30, a buffer assembly 20 and a liquid cooling assembly 10 stacked sequentially from the outside to the inside.

[0038] The liquid cooling assembly 10 has a flow channel 1a for containing coolant, and the liquid cooling assembly 10 is used to support the battery cell a. The buffer assembly 20 includes a hard first support member 21 and an elastic first buffer member 22, the first support member 21 is connected to the bottom of the liquid cooling assembly 10, and there is a first gap 2a between the first support member 21 and the flow channel 1a, and the first buffer member 22 is connected between the first support member 21 and the bottom guard plate 30.

[0039] The hard first support member 21 has high strength and is not easily deformed, and can protect the flow channel 1a against external forces. The first support member 21 is made of metal, such as aluminum, but can also be made of non-metal, such as hard PU or PA.

[0040] When the bottom of the battery pack box 100 is subjected to external force, the first buffer 22 will first be compressed by the external force, and then the first buffer 22 will transfer the external force to the first support member 21, and then the first support member 21 will transfer the external force to the flow channel 1a. Since there is a first gap 2a between the first support member 21 and the flow channel 1a, the first gap 2a plays a buffering role against the external force, thereby greatly reducing the deformation of the flow channel 1a, and further greatly reducing the concavity of the flow channel 1a, so as to ensure the liquid cooling flow of each branch and ensure the normal operation of the liquid cooling system. In addition, the first gap 2a between the first support member 21 and the flow channel 1a reduces the contact area between the first support member 21 and the liquid cooling assembly 10, thereby reducing the speed of heat transfer from the flow channel 1a to the first support member 21, further reducing energy loss.

[0041] Figure 2 and Figure 3 The side beam 200 is shown in the figure, and the side beam 200 and the bottom guard plate 30 are arranged to form a space for accommodating the battery cell a.

[0042] In an alternative embodiment, if Figure 1 and Figure 4As shown, the liquid cooling assembly 10 includes a second support plate 11 and a flow channel plate 12. The flow channel plate 12 has a flow channel groove 121 and a first connecting portion 122. The first connecting portion 122 is arranged adjacent to the flow channel groove 121 and is closely connected to the second support plate 11. The flow channel groove 121 and the second support plate 11 constitute a flow channel 1a.

[0043] The liquid cooling assembly 10 is located at the bottom of the battery cell a for heat exchange, the second support plate 11 supports the battery cell a, and the flow channel 1a for the flow of coolant is formed by the flow channel 121 and the second support plate 11. When the buffer assembly 20 is subjected to external force, the first buffer member 22 is compressed and deformed by the external force, and the first buffer member 22 transmits the external force to the first support member 21. Since there is a first gap 2a between the first support member 21 and the flow channel 1a, the external force will be transmitted to the first connecting portion 122 in the non-flow channel 1a area, thereby reducing the deformation of the flow channel 1a.

[0044] In an alternative embodiment, if Figure 1 , Figure 4 and Figure 5 As shown, a side of the first support member 21 close to the liquid cooling assembly 10 is provided with an avoidance groove 211 and a second connecting portion 212, the second connecting portion 212 is arranged adjacent to the avoidance groove 211, the flow channel groove 121 is located in the avoidance groove 211, and a first gap 2a is formed between the flow channel groove 121 and the avoidance groove 211, and the second connecting portion 212 is connected to the first connecting portion 122.

[0045] The avoidance groove 211 provided on the first support member 21 can reduce the phenomenon of the first support member 21 contacting the flow channel 1 a after being deformed by force, thereby reducing the situation of the flow channel 1 a being damaged.

[0046] Furthermore, the distance of the first gap 2a is Figure 5 The h1 range shown in FIG. 1 is 1 to 8 mm.

[0047] When h1 is less than 1 mm, the first support member 21 is easily in contact with the flow channel 1a when deformed by external force, causing damage to the flow channel 1a. When h1 is greater than 8 mm, that is, when the gap between the first support member 21 and the flow channel 1a is too large, the first gap 2a occupies a large space, reducing the volume utilization of the battery pack body 100.

[0048] In an alternative embodiment, if Figure 5 As shown, the thickness of the first support member 21 is Figure 5 The h2 range shown in FIG. 1 is 0.5 to 5 mm.

[0049] When h2 is less than 0.5 mm, the thickness of the first support member 21 is too thin, and the strength of the first support member 21 is low, which affects the protection effect of the flow channel 1a. When h2 is greater than 5 mm, the thickness of the first support member 21 is too thick, which will increase the overall mass of the first support member 21, thereby increasing the overall mass of the battery pack box 100.

[0050] In an alternative embodiment, if Figure 4 and Figure 5 As shown, there is a first fillet between the first connection portion 122 and the flow channel groove 121, and there is a second fillet between the second connection portion 212 and the avoidance groove 211. The distance between the first fillet and the second fillet at the opposite position is Figure 5 The h3 range shown in is less than or equal to 15 mm.

[0051] When h3 is less than or equal to 15 mm, the structural stability of the first support member 21 can be ensured. When h3 is greater than 15 mm, the second fillet between the second connecting portion 212 and the avoidance groove 211 is easily deformed under stress, thereby damaging the support structure.

[0052] The first connection portion 122 and the second connection portion 212 are connected by an adhesive, and the adhesive is applied to the adhesive area. The first connection portion 122 and the second connection portion 212 form an adhesive area. Figure 5 The range of h5 shown in FIG. 1 is 5 to 25 mm. Of course, the first connection portion 122 and the second connection portion 212 may also be connected by other connection methods, which are not limited in the embodiment of the present application.

[0053] When h5 is less than 5 mm, that is, the contact area between the first connection part 122 and the second connection part 212 is small, the bonding strength between the first connection part 122 and the second connection part 212 is weak, and when the first support member 21 is subjected to external force, the flow channel plate 12 will be under greater pressure, which may easily cause damage to the first support member 21 and the flow channel plate 12.

[0054] When h5 is greater than 25 mm, that is, the contact area between the first connection portion 122 and the second connection portion 212 is larger, thereby increasing the heat exchange between the liquid cooling assembly 10 and the first support member 21, further affecting the thermal insulation effect.

[0055] In an alternative embodiment, if Figure 1 , Figure 4 and Figure 5 As shown, the inner surface of the first buffer member 22 matches the outer surface of the first support member 21 in shape, and the inner surface of the first buffer member 22 is attached to the outer surface of the first support member 21 .

[0056] The material of the first buffer 22 is a foam material. The first buffer 22 made of foam material has good compression characteristics and can be used to buffer the extrusion force on the bottom of the battery pack. As an example, the first buffer 22 is PU foam or silicone foam. In addition, the thermal conductivity of the first buffer 22 made of foam material is low, which can keep the battery pack warm and reduce the heat exchange between the liquid cooling component 10 and the external environment, thereby reducing energy loss. The matching of the inner surface of the first buffer 22 with the outer surface of the first support member 21 enables the first buffer 22 to provide all-round protection for the first support member 21, thereby reducing damage to the first support member 21.

[0057] The thickness of the first buffer member 22 is Figure 5 The range of h4 shown in FIG. 4 is 4 to 15 mm. When h4 is between 4 and 15 mm, the buffering capacity of the first buffer member 22 can be ensured while ensuring the occupied space of the first buffer member 22 .

[0058] When h4 is less than 4 mm, the first buffer member 22 is relatively thin, which affects the buffering capacity of the first buffer member 22. When h4 is greater than 15 mm, the first buffer member 22 is too thick, occupies a large space, and affects the space utilization.

[0059] In an optional embodiment, there is an adhesive layer between the first buffer 22 and the first support 21, and the first buffer 22 and the first support 21 are connected by adhesive to prevent the first buffer 22 and the first support 21 from moving when subjected to external force. The thickness of the adhesive layer ranges from 0.2 to 2 mm, which can ensure the connection effect between the first buffer 22 and the first support 21, and also ensure the buffering effect of the first buffer 22.

[0060] When the thickness of the adhesive layer is less than 0.2 mm, the thin thickness of the adhesive layer will affect the connection firmness between the first buffer member 22 and the first support member 21. When the thickness of the adhesive layer is greater than 2 mm, the excessively thick adhesive layer will affect the overall buffering effect of the buffer assembly 20.

[0061] like Figure 5 As shown, the surface of the bottom guard plate 30 close to the first buffer 22 is provided with a plurality of third connecting parts 31 protruding from the surface thereof, the third connecting parts 31 are connected to the first buffer 22, and a second gap 3a is provided between the bottom guard plate 30 and the first buffer 22. The second gap 3a has the same function as the first gap 2a, both of which can buffer external forces, and the second gap 3a can reduce the damage to the first buffer 22 caused by external force impact.

[0062] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A battery pack box, characterized in that: It comprises a bottom guard plate (30), a buffer assembly (20) and a liquid cooling assembly (10) which are stacked in sequence from the outside to the inside; wherein: The liquid cooling assembly (10) has a flow channel (1a) for containing cooling liquid and is used to support the battery cell (a); The buffer component (20) comprises a hard first support member (21) and an elastic first buffer member (22); the first support member (21) is connected to the bottom of the liquid cooling component (10) and has a first gap (2a) with the flow channel (1a); the first buffer member (22) is connected between the first support member (21) and the bottom guard plate (30).

2. The battery pack case according to claim 1, characterized in that: The liquid cooling assembly (10) comprises a second support plate (11) and a flow channel plate (12); the flow channel plate (12) has a flow channel groove (121) and a first connecting portion (122); the first connecting portion (122) is arranged adjacent to the flow channel groove (121) and is in contact with the second support plate (11); the flow channel groove (121) and the second support plate (11) constitute the flow channel (1a).

3. The battery pack case according to claim 2, characterized in that: A side of the first support member (21) close to the liquid cooling assembly (10) is provided with an avoidance groove (211) and a second connecting portion (212); the second connecting portion (212) is arranged adjacent to the avoidance groove (211); the flow channel groove (121) is located in the avoidance groove (211) and forms the first gap (2a) with the avoidance groove (211); and the second connecting portion (212) is connected to the first connecting portion (122).

4. The battery pack case according to claim 3, characterized in that: The distance range of the first gap (2a) is 1 to 8 mm.

5. The battery pack case according to claim 3, characterized in that: The thickness of the first support member (21) is in the range of 0.5 to 5 mm.

6. The battery pack case according to claim 3, characterized in that: There is a first rounded corner between the first connecting portion (122) and the flow channel groove (121), there is a second rounded corner between the second connecting portion (212) and the avoidance groove (211), and the distance between the first rounded corner and the second rounded corner at the relative position thereof is less than or equal to 15 mm.

7. The battery pack case according to claim 3, characterized in that: An adhesive area is formed between the first connecting portion (122) and the second connecting portion (212), and the width of the adhesive area is in the range of 5 to 25 mm.

8. The battery pack case according to claim 1, characterized in that: The inner surface of the first buffer member (22) conforms to the shape of the outer surface of the first support member (21), and the inner surface of the first buffer member (22) fits the outer surface of the first support member (21).

9. The battery pack case according to claim 1, characterized in that: The thickness of the first buffer member (22) ranges from 4 to 15 mm.

10. The battery pack case according to claim 1, characterized in that: It also comprises an adhesive layer, wherein the adhesive layer is connected between the first buffer member (22) and the first support member (21), and the thickness of the adhesive layer is in the range of 0.2 to 2 mm.

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