Bottom protection structure and battery pack

Abstract

The utility model provides a bottom protection structure and a battery pack, and the bottom protection structure comprises a bottom protection plate arranged at the bottom of the battery pack; the liquid cooling plate is arranged on one side, close to a battery cell of the battery pack, of the bottom protection plate; the protection plate is clamped between the liquid cooling plate and the bottom protection plate, and the protection plate comprises a plurality of first protection bodies and a plurality of second protection bodies, and the first protection bodies and the second protection bodies are alternately arranged; wherein the two opposite sides of each first protection body are in contact with the liquid cooling plate and the bottom protection plate respectively, and each second protection body and the bottom protection plate are arranged at an interval, so that the problems that in the prior art, the contact area between the liquid cooling plate and the bottom protection plate of the battery pack is large due to the structure used for protecting the bottom of the battery pack, and the reliability of the battery pack is improved are solved. Therefore, the thermal insulation performance of the battery pack is influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field, specifically, bottom protection structure and battery pack. BACKGROUND

[0002] When the vehicle encounters some pothole road, road, obstacles and so on in the driving process, the bottom (including the bottom guard plate, liquid cooling plate and battery cell shell arranged from outside to inside) of the battery pack of the power battery is easy to be impacted, and then the bottom guard plate failure or rupture, liquid cooling plate failure or rupture, battery cell shell extrusion or rupture and other phenomena appear, which may even cause fire or explosion, and cause great threat to the safety of personnel and great negative impact on the vehicle enterprise / battery enterprise.

[0003] At present, the commonly used solution is to set a support body in the non-flow area of the bottom of the liquid cooling plate, and to disperse the external force in the non-flow area, so as to reduce the damage to the flow area and improve the carrying capacity and reliability of the bottom of the battery pack.

[0004] However, the above-mentioned solution will make the contact area between the liquid cooling plate and the bottom guard plate relatively large, thereby affecting the heat preservation performance of the battery pack. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a bottom protection structure and a battery pack, so as to solve the problem that the structure for protecting the bottom of the battery pack in the related art is easy to cause the contact area between the liquid cooling plate and the bottom guard plate of the battery pack to be relatively large, thereby affecting the heat preservation performance of the battery pack.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a bottom protection structure is provided, which comprises: a bottom guard plate, the bottom guard plate is arranged at the bottom of the battery pack; a liquid cooling plate, the liquid cooling plate is arranged at the side of the bottom guard plate close to the battery cell of the battery pack; a protection plate, the protection plate is clamped between the liquid cooling plate and the bottom guard plate, the protection plate comprises a plurality of first protection bodies and a plurality of second protection bodies alternately arranged with the plurality of first protection bodies; wherein the opposite sides of each first protection body are in contact with the liquid cooling plate and the bottom guard plate respectively, and each second protection body is arranged in space with the bottom guard plate.

[0007] Further, a plurality of contact protrusions are arranged in space on the liquid cooling plate to jointly form a plurality of grooves; wherein each contact protrusion is located at the side of the liquid cooling plate close to the protection plate, and at least part of the plurality of contact protrusions are in one-to-one contact with the plurality of first protection bodies; at least part of the plurality of grooves are arranged in one-to-one correspondence with the plurality of second protection bodies, and each second protection body is located in the corresponding groove.

[0008] Further, each second protection body is arranged in space with the groove bottom surface of the corresponding groove.

[0009] Further, the liquid cooling plate comprises a planar plate and a flow channel plate, the planar plate and the flow channel plate are weldedly connected, the planar plate is located on a side of the flow channel plate away from the bottom guard plate; the flow channel plate comprises a flow channel plate body and a plurality of contact protrusions arranged on the flow channel plate body, the flow channel plate body is in contact with the planar plate, and each contact protrusion is arranged in a spaced manner with the planar plate to form a plurality of cooling flow channels.

[0010] Further, a plurality of cooling sub-zones are arranged on the liquid cooling plate, and the plurality of cooling sub-zones are arranged in a rectangular array; the number of the guard plates is a plurality, and the plurality of guard plates are arranged in one-to-one correspondence with the plurality of cooling sub-zones.

[0011] Further, the plurality of contact protrusions comprise a plurality of main contact protrusions and a plurality of auxiliary contact protrusions, the plurality of main contact protrusions and the planar plate jointly form a main cooling flow channel, and each auxiliary contact protrusion is in communication with at least one of the plurality of main contact protrusions to jointly form an auxiliary cooling flow channel with the planar plate.

[0012] Further, the plurality of main contact protrusions are sequentially connected in a head-to-tail manner along the direction of the outer circumferential surface of the flow channel plate to jointly form a ring-shaped main cooling flow channel with the planar plate; and each auxiliary contact protrusion is located in a cooling area surrounded by the ring-shaped main cooling flow channel.

[0013] Further, the flow channel plate body is provided with a first strip-shaped fixing portion and a second strip-shaped fixing portion, the first strip-shaped fixing portion extends along a first direction, and the second strip-shaped fixing portion extends along a second direction perpendicular to the first direction; the bottom guard plate and the liquid cooling plate are connected through a plurality of second fasteners, and at least part of the second fasteners are arranged at the first strip-shaped fixing portion; and the first strip-shaped fixing portion and the second strip-shaped fixing portion are in contact with the planar plate to separate the cooling area into a plurality of cooling sub-zones.

[0014] Further, the auxiliary contact protrusion comprises a plurality of first auxiliary contact protrusions and a plurality of second auxiliary contact protrusions in communication, each first auxiliary contact protrusion extends along a first direction, and each second auxiliary contact protrusion extends along a second direction perpendicular to the first direction; the plurality of first auxiliary contact protrusions are arranged in a spaced manner along the second direction to jointly form a plurality of first grooves, and the plurality of second auxiliary contact protrusions are arranged in a spaced manner along the first direction to jointly form a plurality of second grooves; the plurality of second guard bodies comprise a plurality of second transverse guard bodies and at least one second longitudinal guard body, the plurality of second transverse guard bodies are arranged in one-to-one correspondence with at least part of the plurality of first grooves, and the at least one second longitudinal guard body is arranged in one-to-one correspondence with at least one of the plurality of second grooves.

[0015] Further, the bottom protection plate comprises a bottom protection plate body and a plurality of side plate bodies arranged in sequence around the periphery of the bottom protection plate body, and the bottom protection plate body and the plurality of side plate bodies jointly enclose a mounting cavity; wherein the protection plate is located in the mounting cavity, and each side plate body is connected with the liquid cooling plate through a plurality of first fasteners.

[0016] Further, a plurality of first through holes for allowing the plurality of first fasteners to pass through one by one are arranged on one of each side plate body and the liquid cooling plate; and a plurality of first threaded holes for threadedly connecting with the plurality of first fasteners one by one are arranged on the other of each side plate body and the liquid cooling plate.

[0017] Further, the bottom protection plate body and the liquid cooling plate are connected through a plurality of second fasteners.

[0018] Further, a plurality of second through holes for allowing the plurality of second fasteners to pass through one by one are arranged on one of the bottom protection plate body and the liquid cooling plate; and a plurality of second threaded holes for threadedly connecting with the plurality of second fasteners one by one are arranged on the other of the bottom protection plate body and the liquid cooling plate.

[0019] Further, a plurality of mounting protrusions are arranged on the bottom protection plate body, and the plurality of second through holes are arranged on the plurality of mounting protrusions one by one, and each mounting protrusion is located on the side of the bottom protection plate body close to the liquid cooling plate.

[0020] According to another aspect of the utility model, a battery pack is provided, comprising the bottom protection structure.

[0021] The bottom protection structure of the utility model comprises: a bottom protection plate, which is arranged at the bottom of the battery pack; a liquid cooling plate, which is arranged at the side of the bottom protection plate close to the battery cell of the battery pack; and a protection plate, which is arranged between the liquid cooling plate and the bottom protection plate and comprises a plurality of first protection bodies and a plurality of second protection bodies arranged alternately with the first protection bodies; wherein the opposite sides of each first protection body are in contact with the liquid cooling plate and the bottom protection plate respectively, and each second protection body is arranged spaced apart from the bottom protection plate. In this way, the bottom protection structure of the utility model sets the protection plate with a plurality of second protection bodies, thereby increasing the protection of the impact on the bottom of the battery pack, reducing the contact area between the protection plate and the bottom protection plate, weakening the heat transfer between the liquid cooling plate and the bottom protection plate, effectively improving the heat preservation performance of the battery pack, and solving the problem in the related art that the structure for protecting the bottom of the battery pack easily leads to a relatively large contact area between the liquid cooling plate and the bottom protection plate of the battery pack, thereby affecting the heat preservation performance of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The illustrations are shown in the drawings, wherein:

[0023] Figure 1 A bottom protection structure according to an embodiment of the application is shown in an isometric view in one direction;

[0024] Figure 2 A bottom protection structure according to an embodiment of the application is shown in an isometric view in another direction; Figure 1

[0025] Figure 3 A bottom protection structure according to an embodiment of the application is shown in a bottom view; Figure 1

[0026] Figure 4 A bottom protection structure according to an embodiment of the application is shown in a top view; Figure 1

[0027] Figure 5 A bottom protection structure according to an embodiment of the application is shown in a cross-sectional view in the A-A direction; Figure 4

[0028] Figure 6 A bottom protection structure according to an embodiment of the application is shown in a partial enlarged view at B of the cross-sectional view; Figure 5

[0029] Figure 7 A bottom protection structure according to an embodiment of the application is shown in an isometric view without the bottom guard plate; Figure 1

[0030] Figure 8 An isometric view of the bottom guard plate of a bottom protection structure according to an embodiment of the application is shown; Figure 1

[0031] Figure 9 A bottom protection structure according to an embodiment of the application is shown in a bottom view of the liquid cooling plate; Figure 1

[0032] Figure 10 A bottom protection structure according to an embodiment of the application is shown in a cross-sectional view of the liquid cooling plate in the C-C direction; Figure 9

[0033] Figure 11 A bottom protection structure according to an embodiment of the application is shown in a partial enlarged view at D of the cross-sectional view; Figure 10

[0034] Figure 12 An isometric view of the planar plate of a liquid cooling plate according to an embodiment of the application is shown; Figure 9

[0035] Figure 13 Figure 9 ​​​​​​​​​​​​An isometric view of the flow channel plate of the liquid cooling plate in one direction;

[0036] Figure 14 An isometric view of the flow channel plate of the liquid cooling plate in one direction; Figure 13 An isometric view of the flow channel plate of the liquid cooling plate in one direction;

[0037] Figure 15 An isometric view of the flow channel plate of the liquid cooling plate in one direction; Figure 1 An isometric view of the flow channel plate of the liquid cooling plate in one direction;

[0038] Figure 16 An isometric view of the flow channel plate of the liquid cooling plate in one direction; Figure 15 An isometric view of the flow channel plate of the liquid cooling plate in one direction;

[0039] Wherein, the above-mentioned drawings include the following reference signs:

[0040] 1, bottom guard plate; 11, bottom guard plate body; 12, side plate body; 13, mounting cavity; 14, first through hole; 15, second through hole; 16, mounting protrusion;

[0041] 2, liquid cooling plate; 21, planar plate; 22, flow channel plate; 23, contact protrusion; 24, groove; 25, flow channel plate body; 26, cooling flow channel; 27, main contact protrusion; 28, auxiliary contact protrusion; 29, first strip-shaped fixing part; 210, second strip-shaped fixing part; 211, first threaded hole; 212, second threaded hole; 213, first auxiliary contact protrusion; 214, second auxiliary contact protrusion;

[0042] 3, guard plate; 31, first guard body; 32, second guard body; 33, second transverse guard body; 34, second longitudinal guard body. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0044] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0045] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the Examples are not intended to limit the scope of the present application unless otherwise specifically stated. Also, it is to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for the sake of convenience. Techniques, methods, and equipment known to those with ordinary skill in the relevant art can not be discussed in detail herein but are considered part of the specification when appropriate. In all examples shown and discussed herein, any specific value is to be interpreted as merely an example and not a limitation. Thus, other examples of the exemplary embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings and, as such, no further discussion with regard thereto is needed.

[0046] As shown in Figures 1 to 16 The utility model provides a bottom protection structure, include: bottom guard board 1, bottom guard board 1 sets up at the bottom of battery pack, liquid cooling plate 2, liquid cooling plate 2 sets up at the side of bottom guard board 1 close to the electric core of battery pack, guard plate 3, guard plate 3 is clamped between liquid cooling plate 2 and bottom guard board 1, and guard plate 3 includes a plurality of first protection body 31 and a plurality of second protection body 32 with a plurality of first protection body 31 alternately arranged, wherein, the opposite sides of each first protection body 31 are in contact with liquid cooling plate 2 and bottom guard board 1 respectively, and each second protection body 32 is spaced apart from bottom guard board 1.

[0047] In this way, the bottom protection structure of the utility model through setting up the guard plate 3 with a plurality of first protection body 31 and a plurality of second protection body 32, while increasing the protection of the impact received by the bottom of battery pack, reduce the contact area between guard plate 3 and bottom guard board 1, weaken the heat transfer between liquid cooling plate 2 and bottom guard board 1, effectively improve the heat preservation performance of battery pack, solve the problem that the structure for protecting the bottom of battery pack in the related art easily leads to the contact area between the liquid cooling plate and the bottom guard plate of battery pack is relatively large, thereby affecting the heat preservation performance of battery pack.

[0048] As shown in Figure 6 , Figure 7 and Figures 9 to 15 Liquid cooling plate 2 is provided with a plurality of contact protrusions 23 spaced apart to jointly form a plurality of grooves 24; wherein each contact protrusion 23 is located on the side of liquid cooling plate 2 close to guard plate 3, at least part of the plurality of contact protrusions 23 correspondingly contact the plurality of first protection bodies 31; at least part of the plurality of grooves 24 correspondingly set the plurality of second protection bodies 32, and each second protection body 32 is located in the corresponding groove 24.

[0049] AsFigure 6 As shown, each second protective body 32 is spaced apart from the bottom surface of the corresponding groove 24.

[0050] In this way, the protective plate 3 further effectively absorbs the impact energy received by the bottom protective plate 1, further reduces the contact area between the liquid cooling plate 2 and the bottom protective plate 1, further weakens the heat transfer between the liquid cooling plate 2 and the bottom protective plate 1, further weakens the heat exchange rate between the liquid cooling plate 2 and the outside world, and further improves the heat preservation performance of the battery pack.

[0051] As shown in Figures 9 to 15 , the liquid cooling plate 2 comprises a planar plate 21 and a flow channel plate 22, the planar plate 21 and the flow channel plate 22 are welded and connected, and the planar plate 21 is located on the side of the flow channel plate 22 away from the bottom protective plate 1; the flow channel plate 22 comprises a flow channel plate body 25 and a plurality of contact protrusions 23 arranged on the flow channel plate body 25, the flow channel plate body 25 is in contact with the planar plate 21, and each contact protrusion 23 is spaced apart from the planar plate 21 to form a plurality of cooling flow channels 26.

[0052] As shown in Figure 7 , Figure 9 , Figure 13 and Figure 14 , a plurality of cooling partitions are arranged on the liquid cooling plate 2, and the plurality of cooling partitions are arranged in a rectangular array; the number of protective plates 3 is a plurality, and the plurality of protective plates 3 are arranged one-to-one corresponding to the plurality of cooling partitions.

[0053] In this way, by arranging a plurality of cooling partitions, it is helpful to more evenly distribute the cooling liquid, reduce the generation of hot spots, ensure that the temperature distribution in the battery pack is more balanced, and can provide customized cooling solutions for different areas, more effectively manage high heat flux density areas, thereby improving the cooling efficiency of the whole battery pack.

[0054] Specifically, four cooling partitions are arranged on the liquid cooling plate 2, and the four cooling partitions are arranged in a rectangular array; the number of protective plates 3 is four, and the four protective plates 3 are arranged one-to-one corresponding to the four cooling partitions.

[0055] As shown in Figure 13 and Figure 14 , the plurality of contact protrusions 23 comprise a plurality of main contact protrusions 27 and a plurality of auxiliary contact protrusions 28, the plurality of main contact protrusions 27 and the planar plate 21 together form a main cooling flow channel, and each auxiliary contact protrusion 28 is in communication with at least one of the plurality of main contact protrusions 27 to form an auxiliary cooling flow channel with the planar plate 21.

[0056] Specifically, the plurality of main contact protrusions 27 are sequentially connected end to end along the direction of the outer circumferential surface of the flow channel plate 22 to jointly form an annular main cooling flow channel with the planar plate 21;Wherein, each auxiliary contact protrusion 28 is located in the cooling area surrounded by the annular main cooling flow channel.

[0057] Further, a plurality of stop protrusions are arranged in the main cooling flow channel, each stop protrusion is located on the side of the corresponding main contact protrusion 27 close to the planar plate 21, so as to divide the cooling liquid in the main cooling flow channel, to disrupt the flow of the cooling liquid in the main cooling flow channel, reduce the dead zone of the fluid in the main cooling flow channel, help to improve the fluid dynamics characteristics of the cooling liquid in the main cooling flow channel, such as increasing the turbulence, reducing the laminar flow of the fluid, improving the heat conduction efficiency, etc., and can change the flow path of the cooling liquid in the main cooling flow channel, help to achieve more uniform fluid distribution, avoid local overheating, also can provide additional structural strength for the main cooling flow channel, ensure the stability and durability of the liquid cooling plate under larger load.

[0058] As shown in Figure 13 The first strip-shaped fixing portion 29 extends along a first direction, and the second strip-shaped fixing portion 210 extends along a second direction perpendicular to the first direction;The bottom guard plate 1 and the liquid cooling plate 2 are connected by a plurality of second fasteners, at least part of the second fasteners are arranged at the first strip-shaped fixing portion 29;Wherein, the first strip-shaped fixing portion 29 and the second strip-shaped fixing portion 210 are in contact with the planar plate 21, so as to separate the cooling area into a plurality of cooling subareas.

[0059] Specifically, the flow channel plate body 25 is provided with a third strip-shaped fixing portion, the third strip-shaped fixing portion extends along the second direction and is located on one side of the cooling area;Wherein, a part of the second fasteners are arranged at the first strip-shaped fixing portion 29, and another part of the second fasteners are arranged at the third strip-shaped fixing portion.

[0060] The first direction and the second direction of the utility model are parallel to the planar plate 21.

[0061] As shown in Figure 13As shown, the auxiliary contact protrusions 28 include a plurality of first auxiliary contact protrusions 213 and a plurality of second auxiliary contact protrusions 214 in communication, each first auxiliary contact protrusion 213 extends along a first direction, and each second auxiliary contact protrusion 214 extends along a second direction perpendicular to the first direction; the plurality of first auxiliary contact protrusions 213 are arranged in the second direction to collectively enclose a plurality of first grooves, and the plurality of second auxiliary contact protrusions 214 are arranged in the first direction to collectively enclose a plurality of second grooves; the plurality of second protective bodies 32 include a plurality of second transverse protective bodies 33 and at least one second longitudinal protective body 34, the plurality of second transverse protective bodies 33 are arranged in one-to-one correspondence with at least part of the plurality of first grooves, and the at least one second longitudinal protective body 34 is arranged in one-to-one correspondence with at least one of the plurality of second grooves.

[0062] As shown in Figure 8 The bottom guard plate 1 includes a bottom guard plate body 11 and a plurality of side plate bodies 12 arranged in sequence around the periphery of the bottom guard plate body 11, and the bottom guard plate body 11 and the plurality of side plate bodies 12 collectively enclose a mounting cavity 13; wherein the protective plate 3 is located in the mounting cavity 13, and each side plate body 12 is connected with the liquid cooling plate 2 through a plurality of first fasteners.

[0063] As shown in Figure 8 and Figure 9 Each side plate body 12 and one of the liquid cooling plates 2 are arranged with a plurality of first through holes 14 for the plurality of first fasteners to pass through in one-to-one correspondence; and the other of the side plate body 12 and the liquid cooling plate 2 is arranged with a plurality of first threaded holes 211 for threadedly connecting with the plurality of first fasteners in one-to-one correspondence.

[0064] In this way, the stability and reliability of the connection between the plurality of side plate bodies 12 of the bottom guard plate 1 and the liquid cooling plate 2 are ensured.

[0065] The bottom guard plate 1 of the bottom protection structure is connected between the bottom guard plate body 11 and the liquid cooling plate 2 through a plurality of second fasteners.

[0066] As shown in Figure 8 and Figure 9 One of the bottom guard plate body 11 and the liquid cooling plate 2 is arranged with a plurality of second through holes 15 for the plurality of second fasteners to pass through in one-to-one correspondence; and the other of the bottom guard plate body 11 and the liquid cooling plate 2 is arranged with a plurality of second threaded holes 212 for threadedly connecting with the plurality of second fasteners in one-to-one correspondence.

[0067] In this way, the stability and reliability of the connection between the bottom guard plate body 11 and the liquid cooling plate 2 are ensured.

[0068] As shown in Figure 8As shown, a plurality of mounting protrusions 16 are arranged at intervals on the bottom guard plate body 11 , and a plurality of second through holes 15 are arranged on the plurality of mounting protrusions 16 in a one-to-one correspondence. Each mounting protrusion 16 is located on a side of the bottom guard plate body 11 close to the liquid cooling plate 2 .

[0069] In this way, the second fastener can be prevented from occupying a large space in the thickness direction, thereby reducing the thickness of the bottom protective structure.

[0070] Optionally, the protection plate 3 of the bottom protection structure of the present invention is made of at least one of foam and rubber.

[0071] Optionally, the bottom guard plate 1 of the bottom protection structure of the present invention is made of at least one of aluminum profiles and steel.

[0072] like Figures 1 to 16 As shown, the present invention also provides a battery pack, including the above-mentioned bottom protection structure.

[0073] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0074] The bottom protection structure of the present invention includes: a bottom protection plate 1, which is arranged at the bottom of the battery pack; a liquid cooling plate 2, which is arranged on the side of the bottom protection plate 1 close to the battery cells of the battery pack; a protective plate 3, which is clamped between the liquid cooling plate 2 and the bottom protection plate 1, and the protective plate 3 includes a plurality of first protective bodies 31 and a plurality of second protective bodies 32 alternately arranged with the plurality of first protective bodies 31; wherein, the opposite sides of each first protective body 31 are respectively in contact with the liquid cooling plate 2 and the bottom protection plate 1, and each second protective body 32 is spaced apart from the bottom protection plate 1. In this way, the bottom protection structure of the present invention increases the protection against impact on the bottom of the battery pack by providing a protection plate 3 with multiple second protection bodies 32, while reducing the contact area between the protection plate 3 and the bottom protection plate 1, weakening the heat transfer between the liquid cooling plate 2 and the bottom protection plate 1, and effectively improving the thermal insulation performance of the battery pack. It solves the problem in the related art that the structure for protecting the bottom of the battery pack easily leads to a relatively large contact area between the liquid cooling plate of the battery pack and the bottom protection plate, thereby affecting the thermal insulation performance of the battery pack.

[0075] In the description of the utility model, it is understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship is usually based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, in the absence of the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.

[0076] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0077] In addition, it should be noted that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore can not be understood as the limitation of the protection scope of the utility model.

[0078] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A bottom protection structure, characterized in that: include: A bottom guard plate (1), the bottom guard plate (1) being arranged at the bottom of the battery pack; a liquid cooling plate (2), the liquid cooling plate (2) being arranged on a side of the bottom guard plate (1) close to the battery cells of the battery pack; A protective plate (3), the protective plate (3) being sandwiched between the liquid cooling plate (2) and the bottom guard plate (1), the protective plate (3) comprising a plurality of first protective bodies (31) and a plurality of second protective bodies (32) arranged alternately with the plurality of first protective bodies (31); The opposite sides of each first protective body (31) are in contact with the liquid cooling plate (2) and the bottom protective plate (1) respectively, and each second protective body (32) is spaced apart from the bottom protective plate (1).

2. The bottom protection structure according to claim 1, characterized in that: The liquid cooling plate (2) is provided with a plurality of contact protrusions (23) at intervals to collectively form a plurality of grooves (24); wherein, Each of the contact protrusions (23) is located on a side of the liquid cooling plate (2) close to the protective plate (3), and at least a portion of the plurality of contact protrusions (23) is in one-to-one contact with the plurality of first protective bodies (31); At least part of the plurality of grooves (24) is arranged in one-to-one correspondence with the plurality of second protective bodies (32), and each of the second protective bodies (32) is located in the corresponding groove (24).

3. The bottom protection structure according to claim 2, characterized in that: Each of the second protective bodies (32) is spaced apart from the bottom surface of the corresponding groove (24).

4. The bottom protection structure according to claim 2, characterized in that: The liquid cooling plate (2) comprises: A plane plate (21) and a flow channel plate (22), wherein the plane plate (21) and the flow channel plate (22) are welded together, and the plane plate (21) is located on a side of the flow channel plate (22) away from the bottom guard plate (1); The flow channel plate (22) comprises a flow channel plate body (25) and a plurality of contact protrusions (23) arranged at intervals on the flow channel plate body (25); the flow channel plate body (25) is in contact with the plane plate (21); and each of the contact protrusions (23) is arranged at intervals from the plane plate (21) to form a plurality of cooling flow channels (26).

5. The bottom protection structure according to claim 1, characterized in that: The liquid cooling plate (2) is provided with a plurality of cooling partitions, and the plurality of cooling partitions are arranged in a rectangular array; There are multiple protective plates (3), and the multiple protective plates (3) are arranged in a one-to-one correspondence with the multiple cooling partitions.

6. The bottom protection structure according to claim 4, characterized in that: The plurality of contact protrusions (23) include a plurality of main contact protrusions (27) and a plurality of auxiliary contact protrusions (28), wherein the plurality of main contact protrusions (27) and the plane plate (21) jointly form a main cooling channel, and each of the auxiliary contact protrusions (28) is connected to at least one of the plurality of main contact protrusions (27) to jointly form an auxiliary cooling channel with the plane plate (21).

7. The bottom protection structure according to claim 6, characterized in that: The plurality of main contact protrusions (27) are sequentially connected end to end along the outer peripheral surface of the flow channel plate (22) to form the annular main cooling flow channel together with the plane plate (21); Wherein, each of the auxiliary contact protrusions (28) is located in a cooling area surrounded by the annular main cooling channel.

8. The bottom protection structure according to claim 7, characterized in that: A first strip-shaped fixing portion (29) and a second strip-shaped fixing portion (210) are provided on the flow channel plate body (25), wherein the first strip-shaped fixing portion (29) extends along a first direction, and the second strip-shaped fixing portion (210) extends along a second direction perpendicular to the first direction; The bottom guard plate (1) and the liquid cooling plate (2) are connected via a plurality of second fasteners, and at least some of the second fasteners are arranged at the first strip-shaped fixing portion (29); The first strip-shaped fixing portion (29) and the second strip-shaped fixing portion (210) are both in contact with the plane plate (21) to separate the cooling area into a plurality of cooling partitions.

9. The bottom protection structure according to claim 6, characterized in that: The auxiliary contact protrusion (28) comprises a plurality of first auxiliary contact protrusions (213) and a plurality of second auxiliary contact protrusions (214) that are connected to each other, each of the first auxiliary contact protrusions (213) extending along a first direction, and each of the second auxiliary contact protrusions (214) extending along a second direction perpendicular to the first direction; The plurality of first auxiliary contact protrusions (213) are spaced apart along the second direction to collectively form a plurality of first grooves, and the plurality of second auxiliary contact protrusions (214) are spaced apart along the first direction to collectively form a plurality of second grooves; The plurality of second protective bodies (32) include a plurality of second transverse protective bodies (33) and at least one second longitudinal protective body (34), the plurality of second transverse protective bodies (33) being arranged in a one-to-one correspondence with at least part of the plurality of first grooves, and the at least one second longitudinal protective body (34) being arranged in a one-to-one correspondence with at least one of the plurality of second grooves.

10. The bottom protection structure according to any one of claims 1 to 9, characterized in that: The bottom guard plate (1) includes a bottom guard plate body (11) and a plurality of side plate bodies (12) sequentially arranged around the circumference of the bottom guard plate body (11), and the bottom guard plate body (11) and the plurality of side plate bodies (12) together form an installation cavity (13); wherein the protective plate (3) is located in the installation cavity (13), and each of the side plate bodies (12) is connected to the liquid cooling plate (2) via a plurality of first fasteners.

11. The bottom protection structure according to claim 10, characterized in that: A plurality of first through holes (14) for allowing the plurality of first fasteners to pass through in a one-to-one correspondence are provided at intervals on each of the side plates (12) and one of the liquid cooling plates (2); A plurality of first threaded holes (211) for correspondingly threaded connection with the plurality of first fasteners are provided at intervals on each of the side plates (12) and the other of the liquid cooling plates (2).

12. The bottom protection structure according to claim 10, characterized in that: The bottom guard plate body (11) and the liquid cooling plate (2) are connected via a plurality of second fasteners.

13. The bottom protection structure according to claim 12, characterized in that: A plurality of second through holes (15) for allowing the plurality of second fasteners to pass through in a one-to-one correspondence are provided at intervals on one of the bottom guard plate body (11) and the liquid cooling plate (2); A plurality of second threaded holes (212) for correspondingly threaded connection with the plurality of second fasteners are provided at intervals on the other of the bottom guard plate body (11) and the liquid cooling plate (2).

14. The bottom protection structure according to claim 13, characterized in that: A plurality of mounting protrusions (16) are arranged at intervals on the bottom guard plate body (11), and the plurality of second through holes (15) are arranged one-to-one on the plurality of mounting protrusions (16), and each of the mounting protrusions (16) is located on a side of the bottom guard plate body (11) close to the liquid cooling plate (2).

15. A battery pack, characterized in that: The bottom protection structure comprises the bottom protection structure according to any one of claims 1 to 14.

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