Battery box and battery pack

Abstract

The utility model relates to a battery box and a battery pack. The battery box comprises an outer edge beam, a liquid cooling plate and a welding part, an accommodating cavity with two open ends in the height direction of the battery box is defined by the outer edge beams and is used for accommodating a battery cell group. The liquid cooling plate covers the opening in one end of the containing cavity, the welding part is arranged on the inner wall of the outer edge beam and provided with a welding face opposite to the liquid cooling plate in the height direction, and the liquid cooling plate is welded to the welding face. The welding part is provided with a deformation section, and the deformation section is configured to be capable of deforming towards the outer edge beam when being expanded and extruded by the battery cell group in the accommodating cavity. According to the technical scheme, the battery cell group cannot be supported on the welding seam and can be in effective heat exchange contact with the liquid cooling plate, the heat transfer efficiency of the battery cell group and the liquid cooling plate is high, the battery cell group can be prevented from being scratched by the welding seam, and the service life of the battery cell group is prolonged. In addition, when the battery cell group expands, the deformation section deforms towards the outer edge beam to avoid expansion of the battery cell group, the battery cell group cannot be extruded and damaged, and the service life of the battery cell group is prolonged.

Description

Technical Field

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

[0002] Battery packs often use a water-cooling plate at the bottom to cool the battery pack. The water-cooling plate is often welded to the battery pack's side beams. If the weld seam on the water-cooling plate falls on the bottom of the battery pack, it usually needs to be polished smooth after welding. Failure to maintain smoothness during polishing will affect heat transfer between the water-cooling plate and the battery pack. Incomplete polishing can also result in burrs that could scratch the battery pack. Utility Model Content

[0003] Based on this, it is necessary to provide a battery box and battery pack to address the problem that the weld between the water cooling plate and the battery box falls on the bottom of the battery cell group, which easily affects the heat transfer between the water cooling plate and the battery cell group, and easily scratches the battery cell group, resulting in a reduced service life of the battery cell group.

[0004] In a first aspect, the present application provides a battery box, comprising:

[0005] The outer side beams enclose a receiving cavity with openings at both ends in the height direction of the battery box, and the receiving cavity is used to receive the battery cell group;

[0006] a liquid cooling plate, covering an opening at one end of the accommodating cavity; and

[0007] a welding portion, provided on the inner wall of the outer edge beam, having a welding surface arranged opposite to the liquid cooling plate in the height direction, the liquid cooling plate being welded to the welding surface;

[0008] The welding portion has a deformation section, and the deformation section is configured to be able to deform toward the outer edge beam when the battery cell group in the accommodating cavity is expanded and squeezed.

[0009] In some embodiments, the deformation section is a hollow structure so that the deformation section can be deformed under pressure.

[0010] In some embodiments, the welding portion includes a first hollow section and a second hollow section, the first hollow section is provided on the inner walls on both sides opposite to each other in the first direction of the outer edge beam, and the second hollow section is provided on the inner walls on both sides opposite to each other in the second direction of the outer edge beam, the first direction, the second direction and the height direction are not coplanar and intersect with each other; the deformation section includes the first hollow section.

[0011] In some embodiments, the first hollow section and the second hollow section both have a first surface disposed away from the outer edge beam, and an area of ​​the first surface of the first hollow section is greater than an area of ​​the first surface of the second hollow section.

[0012] In some embodiments, the welding portion is integrally formed or assembled with the outer edge beam.

[0013] In some embodiments, the outer edge beam has a bottom end surface located at one end in the height direction; in the height direction, the welding surface is arranged higher than the bottom end surface, and the two form a stepped groove, and the edge of the liquid cooling plate is accommodated in the stepped groove.

[0014] In some embodiments, the inner surface of the liquid cooling plate located in the accommodating cavity is divided into a supporting area and a non-supporting area, and the battery cell group accommodated in the accommodating cavity is supported in the supporting area;

[0015] The liquid cooling plate has a cooling channel for circulating a heat exchange medium, the cooling channel has a liquid inlet end and a liquid outlet end spaced apart in the second direction, and the liquid inlet end and the liquid outlet end are located in the non-support area;

[0016] The cooling channel further includes a heat exchange section connected between the liquid inlet and the liquid outlet. The heat exchange section extends in a zigzag manner within the range of the support area, and the second direction intersects with the height direction.

[0017] In some embodiments, the heat exchange section includes a plurality of heat exchange branches, which are arranged in sequence in the second direction and connected in sequence according to the arrangement order, and the drainage directions of adjacent heat exchange branches are opposite.

[0018] In some embodiments, the battery box further includes a partition beam, the partition beam being located in the accommodating cavity and welded to the liquid cooling plate;

[0019] The separation beam is arranged between the support area and the non-support area.

[0020] In some embodiments, the partition beam is provided in the support area, and the support area is divided into a plurality of sub-areas for supporting the battery cell group; the partition beam is a hollow beam.

[0021] In a second aspect, the present application provides a battery pack, comprising:

[0022] A battery box as described in any of the above embodiments; and

[0023] The battery cell group is arranged in the accommodating cavity and is connected to the liquid cooling plate for heat exchange. The deformation section is arranged in the expansion direction of the battery cell group and abuts against the battery cell group.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] The battery box and battery pack mentioned above are provided with a welding portion on the inner side of the outer side beam, and are welded to the liquid cooling plate through the welding surface at the bottom of the welding portion, so that the area where the battery pack supported on the liquid cooling plate is located can be staggered with the area where the weld formed between the liquid cooling plate and the welding surface is located. The battery cell group will not be supported on the weld, but can be in effective heat exchange contact with the liquid cooling plate, and the heat transfer efficiency between the two is high. Moreover, there is no need to grind the weld, thereby avoiding the problem of the battery cell group supported on the weld being scratched due to inadequate welding of the weld, thereby improving the service life of the battery cell group. In addition, the welding portion has a deformation section located in the expansion direction of the battery cell group. When the battery cell group expands, the deformation section deforms toward the outer side beam to avoid the expansion of the battery cell group, and will not squeeze and damage the battery cell group, further improving the service life of the battery cell group. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 Schematic top view of a battery box in some embodiments.

[0028] Figure 2 for Figure 1 Exploded view of the battery box shown.

[0029] Figure 3 for Figure 1 Bottom view of the battery box shown.

[0030] Figure 4 Schematic diagram of the structure of the battery pack of some embodiments.

[0031] Figure 5 for Figure 3 The AA section of the battery box is shown.

[0032] Figure 6 for Figure 3 The cross-sectional view of the battery box at section BB is shown.

[0033] The accompanying drawings in the specific implementation manner are as follows:

[0034] 1000, battery pack; 100, battery box; Z, height direction; X, first direction; Y, second direction; 10, outer beam; Q, accommodating cavity; 10a, bottom end surface; C, stepped groove; 20, liquid cooling plate; q1, support area;

[0035] q2, non-support area; q11, sub-area; f1, first weld; f2, second weld; 21, cooling channel; 21a, liquid inlet; 21b, liquid outlet; 21d, heat exchange section; d1, heat exchange branch; 30, welding part; 30a, deformation section; 31, first hollow section; 32, second hollow section; m1, welding surface; m2, first surface; 40, partition beam; 200, battery cell group. DETAILED DESCRIPTION

[0036] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that, if any, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] Furthermore, if used, the terms "first" and "second," if present, are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0039] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connected," and "fixed" should be interpreted broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] It should be noted that, if present, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0042] In response to the problems mentioned in the background technology, embodiments of the present application provide a battery box and a battery pack.

[0043] The battery packs involved in the embodiments of the present application include a battery case and a cell group disposed within the battery case. The cell group includes multiple cells, each arranged in a row to form a cell group. Multiple cell groups can be arranged within the battery case. A cell is the smallest unit in a battery pack where electrochemical reactions occur. Cells can be pouch cells, prismatic cells, cylindrical cells, and so on. In one example, the cell includes a housing, an electrode assembly, and an electrolyte contained within the housing. The electrode assembly typically includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive and negative electrodes. The separator insulates the positive and negative electrodes and allows ions to pass through. The electrode assembly can be a laminated or wound structure. The housing typically has an inlet for injecting electrolyte into the housing to soak the electrode assembly. The housing may also include pressure relief valves, pressure relief notches, and other pressure relief features to relieve excessive pressure within the cell, reducing the risk of explosion. For the specific construction of the cell, please refer to the conventional configuration.

[0044] The battery box of the embodiment of the present application is described in detail below.

[0045] Figure 1 Schematic top view of the battery box 100 according to some embodiments. Figure 2 for Figure 1 An exploded view of the battery box 100 is shown. Figure 3 for Figure 1 A bottom view of the battery box 100 is shown.

[0046] Reference Figures 1 to 3 The battery box 100 provided in the embodiment of the present application includes an outer side beam 10, a liquid cooling plate 20 and a welding portion 30. The outer side beam 10 encloses a accommodating cavity Q with openings at both ends in the height direction Z of the battery box 100, and the accommodating cavity Q is used to accommodate the battery cell group 200. The liquid cooling plate 20 covers one end opening of the accommodating cavity Q, and the welding portion 30 is arranged on the inner wall of the outer side beam 10, and has a welding surface m1 arranged opposite to the liquid cooling plate 20 in the height direction Z, and the liquid cooling plate 20 is welded to the welding surface m1. The welding portion 30 has a deformation section 30a, and the deformation section 30a is configured to be able to deform toward the outer side beam 10 when the battery cell group 200 in the accommodating cavity Q expands and squeezes.

[0047] The outer edge beam 10 typically comprises a multi-segmented beam structure connected end to end, which together form a receiving cavity Q with two open ends. Each beam structure can be hollow to reduce the weight of the outer edge beam 10. The bottom opening of the receiving cavity Q is covered by a liquid cooling plate 20, while the top opening of the receiving cavity Q can be covered by a cover (not shown). A cooling channel 21 is provided within the liquid cooling plate 20, through which a heat exchange medium can flow.

[0048] Figure 4 FIG1 is a schematic diagram of the structure of a battery pack 1000 according to some embodiments. Figure 4 It is understood that when the battery cell group 200 is accommodated in the accommodation cavity Q, it is supported on the liquid cooling plate 20 , and the liquid cooling plate 20 is thermally connected to the battery cell group 200 and adjusts the temperature of the battery cell group 200 through a heat exchange medium.

[0049] The weld 30 is provided on the inner wall of the outer side beam 10. The weld 30 and the outer side beam 10 can be integrally formed or separately provided. The weld 30 can extend continuously along the enclosed direction of the outer side beam 10 or be provided only in a localized area on the inner wall of the outer side beam 10, as long as the installation strength requirements of the liquid cooling plate 20 are met.

[0050] The bottom end surface of the welding portion 30 is its welding surface m1. This surface m1 is positioned opposite the liquid cooling plate 20 located at the bottom of the welding portion 30 in the height direction Z, and the two are welded together. As can be understood, a portion of the inner surface of the liquid cooling plate 20 is welded to the welding surface m1, while the battery cell assembly 200 is supported on the remaining inner surface of the liquid cooling plate 20, offset from the welding surface m1 and, consequently, from the weld formed between the liquid cooling plate 20 and the welding surface m1.

[0051] The battery cell will expand during use. Figure 3The direction indicated by X is the expansion direction of the cell group 200. The weld 30 has a deformable section 30a located in the direction of cell group 200 expansion. When the cell group 200 expands and squeezes the deformable section 30a, the deformable section 30a can deform toward the outer beam, providing sufficient expansion space for the cell group 200. This prevents the weld 30 from interfering with the expansion of the cell group 200 and causing damage to the cell group 200. For example, in a prismatic cell, the expansion direction is typically along the thickness of the internal electrode assembly.

[0052] The battery box 100 is provided with a welding portion 30 on the inner side of the outer side beam 10. The welding portion 30 is welded to the liquid cooling plate 20 via the welding surface m1 at the bottom of the welding portion 30. This allows the area where the battery pack supported on the liquid cooling plate 20 to be offset from the area where the weld formed between the liquid cooling plate 20 and the welding surface m1 is located. The battery cell group 200 is not supported on the weld, but can effectively exchange heat with the liquid cooling plate 20, resulting in high heat transfer efficiency. Moreover, there is no need to polish the weld, thereby avoiding the problem of the battery cell group 200 supported on the weld being scratched due to inadequate weld polishing, thereby improving the service life of the battery cell group 200. In addition, the welding portion 30 has a deformation section 30a located in the expansion direction of the battery cell group 200. When the battery cell group 200 expands, the deformation section 30a deforms toward the outer side beam 10 to avoid the expansion of the battery cell group 200, and does not squeeze or damage the battery cell group 200, further improving the service life of the battery cell group 200.

[0053] In some embodiments, the deformation section 30a is a hollow structure so that the deformation section 30a can be deformed under pressure.

[0054] Alternatively, the deformable section 30a can be a hollow beam structure, integrally formed with the hollow outer beam 10. When the deformable section 30a is hollow, the hollow space within it can deform and yield when squeezed by the cell pack 200, preventing rigid compression of the cell pack 200 and thereby extending the service life of the cell pack 200. Furthermore, the hollow deformable section 30a offers a simple and reliable structure, lowers costs, and reduces the weight of the battery case 100.

[0055] Of course, in other embodiments, the deformable section 30a can be composed of a rigid portion and a flexible pad. Specifically, the rigid portion is connected to the outer side beam 10, with the welding surface m1 located at the bottom of the rigid portion. The flexible pad is located on the side of the rigid portion facing away from the outer side beam 10, and can be elastically deformed by the pressure of the battery cell assembly 200. The flexible pad can be a rubber pad, a silicone pad, a sponge pad, etc.

[0056] Figure 5 for Figure 3 The battery box 100 is shown in a cross-sectional view taken along line AA. Figure 6 for Figure 3 The battery box 100 is shown in a cross-sectional view taken along line BB.

[0057] Specifically in the embodiment, refer to Figure 1 and Figure 2 , and combined with Figure 5 and Figure 6 The weld portion 30 includes a first hollow section 31 and a second hollow section 32. The first hollow section 31 is provided on the inner walls of the outer side beam 10 on opposite sides in the first direction X, and the second hollow section 32 is provided on the inner walls of the outer side beam 10 on opposite sides in the second direction Y. The first direction X, the second direction Y, and the height direction Z are non-coplanar and intersect with each other. The deformation section 30a includes the first hollow section 31.

[0058] The first hollow section 31 and the second hollow section 32 are each two sections. The two first hollow sections 31 are arranged in the expansion direction of the battery cell group 200, and the two second hollow sections 32 are located in the non-expansion direction of the battery cell group 200. The first hollow section 31 and the second hollow section 32 can be connected continuously or discontinuously.

[0059] The welding portion 30 is composed of a first hollow section 31 and a second hollow section 32, and has a larger welding surface m1, which can improve the welding stability of the liquid cooling plate 20. Moreover, the overall hollow structure of the welding portion 30 can reduce the weight and consumables of the battery box 100.

[0060] Further to the embodiment, combined with Figure 5 and Figure 6 The first hollow section 31 and the second hollow section 32 both have a first surface m2 set away from the outer edge beam 10, and the area of ​​the first surface m2 of the first hollow section 31 is larger than the area of ​​the first surface m2 of the second hollow section 32.

[0061] When the battery box 100 is applied to the battery pack 1000 , the first surface m2 of the first hollow section 31 and the first surface m2 of the second hollow section 32 can both contact the battery cell group 200 to clamp the battery cell group 200 for stable installation.

[0062] Since the first hollow section 31 is located in the expansion direction of the battery cell group 200, at least the first surface m2 of the first hollow section 31 is in contact with the battery cell group 200. At this time, the area of ​​the first surface m2 of the first hollow section 31 is designed to be larger than the area of ​​the first surface m2 of the second hollow section 32. This can make the reaction force of the first hollow section 31 on the battery cell group 200 more uniform, and can also reduce the overall volume of the welding part 30, thereby reducing the preparation cost of the battery box 100.

[0063] In some embodiments, the welding portion 30 is integrally formed or assembled with the outer edge beam 10 .

[0064] If the welding portion 30 is assembled and connected to the outer edge beam 10, the two can be locked by bolts, etc. For example, the welding portion 30 and the outer edge beam 10 are both hollow beam structures, and two cavities can be obtained by extrusion and then locked and fixed. In this case, the extrusion process of the cavity is relatively simple.

[0065] If the welding portion 30 and the outer edge beam 10 are integrally formed, the two can be designed into two cavities in the same extruded profile, thereby reducing errors caused by multiple assembly processes.

[0066] In some embodiments, combined Figure 5 and Figure 6 The outer edge beam 10 has a bottom end surface 10a at one end in the height direction Z. In the height direction Z, the welding surface m1 is arranged higher than the bottom end surface 10a, and the two form a stepped groove C, in which the edge of the liquid cooling plate 20 is accommodated.

[0067] Alternatively, the welding portions 30 may be continuously arranged along the enclosing direction of the outer edge beam 10 to form a continuous stepped groove C.

[0068] At this time, the outer edge beam 10 and the bottom end of the welding portion 30 form a stepped groove C, and the edge of the liquid cooling plate 20 is set in the stepped groove C, which can reduce the size occupied by the battery box 100 in the height direction Z.

[0069] In some embodiments, combined Figure 1 and Figure 3 The inner surface of the liquid cooling plate 20 located in the accommodating chamber Q is divided into a support area q1 and a non-support area q2. The battery cell group 200 housed in the accommodating chamber Q is supported in the support area q1. The liquid cooling plate 20 has a cooling channel 21 for circulating a heat exchange medium. The cooling channel 21 has a liquid inlet 21a and a liquid outlet 21b spaced apart in the second direction Y. The liquid inlet 21a and the liquid outlet 21b are located in the non-support area q2. The cooling channel 21 also includes a heat exchange section 21d connecting the liquid inlet 21a and the liquid outlet 21b. The heat exchange section 21d extends in a zigzag manner within the range of the support area q1, and the second direction Y intersects with the height direction Z.

[0070] It can be understood that the heat exchange medium enters the cooling channel 21 from the liquid inlet end 21 a and flows out from the liquid outlet end 21 b of the cooling channel 21 .

[0071] The liquid inlet 21a and the liquid outlet 21b of the cooling channel 21 are arranged in the non-support area q2, and the heat exchange section 21d is arranged in the support area q1. Figure 4 It is understood that the battery cell group 200 is supported on the support area q1 of the liquid cooling plate 20, and the heat exchange section 21d is arranged in a zigzag manner and can pass through multiple positions of the battery cell group 200, so that the heat exchange efficiency between the liquid cooling plate 20 and the battery cell group 200 is higher and the temperature of the battery cell group 200 is more uniform.

[0072] It is understandable that the area of ​​the non-support region q2 is smaller than the area of ​​the support region q1 , so as to improve the heat exchange efficiency of the liquid cooling plate 20 and increase the space utilization of the battery box 100 .

[0073] Specifically in the embodiment, combined with Figure 2 and Figure 3 The heat exchange section 21d includes a plurality of heat exchange branches d1, which are arranged in sequence in the second direction Y and connected in sequence according to the arrangement order, and the drainage directions of adjacent heat exchange branches d1 are opposite.

[0074] Typically, multiple groups of battery cell groups 200 are arranged in sequence along the extending direction of each heat exchange branch d1 in the battery box 100 .

[0075] At this time, a heat exchange branch d1 with opposite drainage directions is configured at the bottom of each battery cell group 200, which can improve the heat exchange uniformity of the battery cell group 200. Moreover, the cooling flow channel 21 of the same heat exchange branch d1 can pass through multiple battery cell groups 200, which helps to reduce the temperature difference between different battery cells, improve the consistency of the discharge depth of each battery cell, and help to increase the cycle life of the battery cell.

[0076] Further to the embodiment, refer to Figure 1 The battery box 100 further includes a partition beam 40 , which is located in the accommodating cavity Q and welded to the liquid cooling plate 20 . The partition beam 40 is arranged between the supporting area q1 and the non-supporting area q2 .

[0077] The weld formed by welding the welding portion 30 and the liquid cooling plate 20 is referred to as the first weld f1 (e.g. Figure 6 As shown), the weld formed by welding the partition beam 40 and the liquid cooling plate 20 is called the second weld f2 (as shown Figure 5 The second weld seam f2 can be arranged on the bottom surface of the partition beam 40 and thus be obscured by the partition beam 40, or can be arranged on the side surface of the bottom end of the partition beam 40. Typically, both ends of the partition beam 40 in the longitudinal direction can be fixedly connected to the outer side beam 10 to enhance the structural strength of the battery box 100.

[0078] At this point, the partition beam 40 not only separates the supporting area q1 of the liquid cooling plate 20 from the non-supporting area q2, facilitating assembly of the battery cell assembly 200, but also welds the liquid cooling plate 20 to the welding portion 30 and the liquid cooling plate 20 to the partition beam 40 via the first weld f1 and the second weld f2, respectively. This enhances the strength of the flat-plate liquid cooling plate 20 and provides more reliable support for the battery cell assembly 200.

[0079] Specifically in one embodiment, refer to Figure 1 A partition beam 40 is provided in the support area q1, and divides the support area q1 into a plurality of sub-areas q11 for supporting the battery cell group 200. The partition beam 40 is a hollow beam.

[0080] That is, in addition to providing a partition beam 40 between the support area q1 and the non-support area q2, a portion of the partition beam 40 is further arranged within the support area q1, further dividing the support area q1 into multiple sub-areas q11, i.e., partitioning the support area q1. Typically, but not limited to, each sub-area q11 houses a battery cell group 200.

[0081] The partition beam 40 is a hollow beam, which is not only lightweight, but also can clamp the cell group 200 and position the cell group 200 in the expansion direction of the cell group 200 in each sub-area q11, and can also avoid the expansion of the cell group 200, thereby reducing the risk of damage to the cell group 200 due to expansion.

[0082] In addition, refer to Figure 4 The battery pack 1000 provided in an embodiment of the present application includes a battery case 100 and a cell group 200 according to any of the aforementioned embodiments. The cell group 200 is disposed in the accommodating cavity Q and is heat-exchangeably connected to the liquid cooling plate 20. The deformable section 30a is arranged in the expansion direction of the cell group 200 and abuts against the cell group 200. This battery pack 1000 has all the aforementioned advantages, which will not be further elaborated here.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0084] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A battery box (100), characterized in that: The battery box (100) comprises: An outer side beam (10) encloses a receiving cavity (Q) with openings at both ends in a height direction (Z) of the battery box (100), wherein the receiving cavity (Q) is used to receive a battery cell group (200); a liquid cooling plate (20) covering an opening at one end of the accommodating cavity (Q); and A welding portion (30) is provided on the inner wall of the outer edge beam (10), and has a welding surface (m1) arranged opposite to the liquid cooling plate (20) in the height direction (Z), and the liquid cooling plate (20) is welded to the welding surface (m1); The welding portion (30) has a deformation section (30a), and the deformation section (30a) is configured to be deformed toward the outer edge beam (10) when the battery cell group (200) in the accommodating cavity (Q) is expanded and squeezed.

2. The battery box (100) according to claim 1, characterized in that The deformation section (30a) is a hollow structure, so that the deformation section (30a) can be deformed under pressure.

3. The battery box (100) according to claim 2, characterized in that: The welding portion (30) includes a first hollow section (31) and a second hollow section (32); the first hollow section (31) is provided on two inner walls of the outer edge beam (10) opposite to each other in a first direction (X); the second hollow section (32) is provided on two inner walls of the outer edge beam (10) opposite to each other in a second direction (Y); the first direction (X), the second direction (Y) and the height direction (Z) are not coplanar and intersect each other; the deformation section (30a) includes the first hollow section (31); The first hollow section (31) and the second hollow section (32) both have a first surface (m2) disposed away from the outer edge beam (10), and the area of ​​the first surface (m2) of the first hollow section (31) is greater than the area of ​​the first surface (m2) of the second hollow section (32).

4. The battery box (100) according to claim 1, characterized in that The welding portion (30) is integrally formed or assembled with the outer edge beam (10).

5. The battery box (100) according to claim 1, characterized in that The outer edge beam (10) has a bottom end surface (10a) located at one end in the height direction (Z); in the height direction (Z), the welding surface (m1) is arranged higher than the bottom end surface (10a), and the two form a stepped groove (C), and the edge of the liquid cooling plate (20) is accommodated in the stepped groove (C).

6. The battery box (100) according to claim 1, characterized in that The inner surface of the liquid cooling plate (20) located in the accommodating cavity (Q) is divided into a supporting area (q1) and a non-supporting area (q2), and the battery cell group (200) accommodated in the accommodating cavity (Q) is supported in the supporting area (q1); The liquid cooling plate (20) has a cooling channel (21) for circulating a heat exchange medium, the cooling channel (21) has a liquid inlet end (21a) and a liquid outlet end (21b) arranged at intervals in the second direction (Y), and the liquid inlet end (21a) and the liquid outlet end (21b) are located in the non-support area (q2); The cooling channel (21) further includes a heat exchange section (21d) connected between the liquid inlet end (21a) and the liquid outlet end (21b), wherein the heat exchange section (21d) extends in a zigzag manner within the range of the support area (q1), and the second direction (Y) intersects with the height direction (Z).

7. The battery box (100) according to claim 6, characterized in that: The heat exchange section (21d) comprises a plurality of heat exchange branches (d1), the plurality of heat exchange branches (d1) are arranged in sequence in the second direction (Y) and are connected in sequence according to the arrangement order, and the drainage directions of adjacent heat exchange branches (d1) are opposite.

8. The battery box (100) according to claim 6, characterized in that: The battery box (100) further includes a partition beam (40), wherein the partition beam (40) is located in the accommodating cavity (Q) and is welded to the liquid cooling plate (20); The separation beam (40) is arranged between the support area (q1) and the non-support area (q2).

9. The battery box (100) according to claim 8, characterized in that: The partition beam (40) is provided in the support area (q1), and the support area (q1) is divided into a plurality of sub-areas (q11) for supporting the battery cell group (200); the partition beam (40) is a hollow beam.

10. A battery pack (1000), characterized in that: include: The battery box (100) according to any one of claims 1 to 9; and The battery cell group (200) is arranged in the accommodating cavity (Q) and is heat-exchangedly connected to the liquid cooling plate (20); the deformation section (30a) is arranged in the expansion direction of the battery cell group (200) and abuts against the battery cell group (200).

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