Battery pack

Abstract

The utility model relates to the technical field of batteries, provides a battery pack, and aims to solve the problem that the side part of a cooling tray is easy to collide to deform and damage in the hoisting process of the battery pack. And a controller. The battery pack provided by the utility model comprises a battery box in which a battery cell is arranged, and a liquid cooling tray fixed at the bottom of the battery box, comprising a horizontally-extending first rod piece and a first supporting plate fixed to the lower portion of the first rod piece, the second supporting rail comprises a horizontally-extending second rod piece and a second supporting plate fixed to the lower portion of the second rod piece, and the first supporting rail and the second supporting rail are symmetrical about the vertical symmetrical face of the battery box. The first supporting plate and the second supporting plate are both attached to the bottom face of the liquid cooling tray, the side portions of the first rod piece and the second rod piece are attached to the two sides of the liquid cooling tray respectively, the first supporting rail is fixedly connected with the battery box and / or the liquid cooling tray, and the second supporting rail is fixedly connected with the battery box and / or the liquid cooling tray. Therefore, the risk that the side part of the liquid cooling tray is impacted and deformed is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically provide a battery pack. BACKGROUND

[0002] In recent years, with the continuous development of new energy electric vehicle industry and electric energy storage industry, the market's demand for the performance of the battery pack, which occupies an important position, is increasing. The capacity of the battery pack is increasing, and the size of the battery pack is also increasing with the increase of the capacity. The heat dissipation requirement of the battery pack is also increasing.

[0003] In order to meet the demand of good heat dissipation of the battery pack, the battery pack includes a battery box and a cooling tray installed at the bottom of the battery box. The battery box has six side walls, which enclose a containing cavity for accommodating battery cells. Alternatively, the battery box has five side walls, and the bottom of the battery box has an opening. The battery box and the cooling tray together enclose a containing cavity for accommodating battery cells. The battery cells are arranged in the containing cavity. The cooling tray is provided with cooling liquid channels for the flow of cooling liquid. The cooling liquid carries away the heat generated by the battery cells during the flow in the cooling liquid channels, so as to realize the rapid heat dissipation of the battery cells.

[0004] However, during the hoisting process of the battery pack, the side of the cooling tray is easily bumped by the surrounding objects. The side of the cooling tray is easily deformed and damaged after being bumped, which may cause the leakage of the cooling liquid and the short circuit risk of the battery cells.

[0005] Therefore, there is a need for a new technical solution to solve the above problems in the art. UTILITY MODEL CONTENTS

[0006] The utility model aims to solve the above technical problems, that is, to solve the problem that the side of the cooling tray is easily bumped and deformed during the hoisting process of the battery pack.

[0007] The utility model provides a battery pack, the battery pack includes: battery box, its inside is provided with battery cell;Liquid cooling tray, it is fixed in the bottom of the battery box;First support rail, it includes the first rod piece of horizontal extension and the first support plate of fixed in the lower part of the first rod piece, the first support plate is attached to the bottom surface of the liquid cooling tray, the side of the first rod piece is attached to the first side edge of the liquid cooling tray, and the first support rail is fixedly connected with the battery box and / or the liquid cooling tray;Second support rail, it includes the second rod piece of horizontal extension and the second support plate of fixed in the lower part of the second rod piece, the second support plate is attached to the bottom surface of the liquid cooling tray, the side of the second rod piece is attached to the second side edge of the liquid cooling tray, and the second support rail is fixedly connected with the battery box and / or the liquid cooling tray;Wherein, the first support rail and the second support rail are symmetrical about the vertical symmetry plane of the battery box.

[0008] In the battery pack, the top of the first rod and the top of the second rod are not lower than the top of the liquid cooling tray.

[0009] In the battery pack, a first hoisting member is fixed on the first rod, and a second hoisting member is fixed on the second rod.

[0010] In the battery pack, the first hoisting fixing member is fixedly connected with the battery box, so that the first supporting rail is fixedly connected with the battery box; and the second hoisting fixing member is fixedly connected with the battery box, so that the second supporting rail is fixedly connected with the battery box.

[0011] In the battery pack, the first supporting plate is fixedly connected with the liquid cooling tray by bolts, so that the first supporting rail is fixedly connected with the liquid cooling tray; and the second supporting plate is fixedly connected with the liquid cooling tray by bolts, so that the second supporting rail is fixedly connected with the liquid cooling tray.

[0012] In the battery pack, the first hoisting member comprises a first framework extending along the axial direction of the first rod, the bottom of the first framework extends a first horizontal connecting plate towards the first rod, the first horizontal connecting plate is attached to and fixedly connected with the top of the first rod, the first framework is fixedly connected with the battery box, and a first hoisting structure for connecting a hoisting rope is arranged on the first framework; and the second hoisting member comprises a second framework extending along the axial direction of the second rod, the bottom of the second framework extends a second horizontal connecting plate towards the second rod, the second horizontal connecting plate is attached to and fixedly connected with the top of the second rod, the second framework is fixedly connected with the battery box, and a second hoisting structure for connecting a hoisting rope is arranged on the second framework.

[0013] In the battery pack, the bottom of the first framework further extends a first vertical connecting plate downwards, and the first vertical connecting plate abuts against the side of the first rod facing the liquid cooling tray; and the bottom of the second framework further extends a second vertical connecting plate downwards, and the second vertical connecting plate abuts against the side of the second rod facing the liquid cooling tray.

[0014] In the battery pack, the first hoisting structure comprises a first lug plate arranged at at least one end of the first framework, and a first hoisting hole is formed in the first lug plate; and the second hoisting structure comprises a second lug plate arranged at at least one end of the second framework, and a second hoisting hole is formed in the second lug plate.

[0015] In the preferred technical solution of the battery pack, the first lug plate is fixedly connected to the battery box by bolts, so that the first framework is fixedly connected to the battery box; and the second lug plate is fixedly connected to the battery box by bolts, so that the second framework is fixedly connected to the battery box.

[0016] In the preferred technical solution of the battery pack, at least a part of the top of the liquid cooling tray is not covered by the battery box, and the liquid inlet pipe and the liquid outlet pipe of the liquid cooling tray are arranged in the area of the top of the liquid cooling tray that is not covered by the battery box.

[0017] In the case of adopting the above technical solution, the battery pack comprises: a battery box in which a battery cell is arranged; a liquid cooling tray fixed to the bottom of the battery box; a first supporting rail comprising a first horizontal rod and a first supporting plate fixed to the lower part of the first rod, the first supporting plate being attached to the bottom surface of the liquid cooling tray, and the side of the first rod being attached to the first side edge of the liquid cooling tray, the first supporting rail being fixedly connected to the battery box and / or the liquid cooling tray; and a second supporting rail comprising a second horizontal rod and a second supporting plate fixed to the lower part of the second rod, the second supporting plate being attached to the bottom surface of the liquid cooling tray, and the side of the second rod being attached to the second side edge of the liquid cooling tray, the second supporting rail being fixedly connected to the battery box and / or the liquid cooling tray; wherein the first supporting rail and the second supporting rail are symmetrical about the vertical symmetry plane of the battery box.

[0018] Through such an arrangement, the first rod of the first supporting rail is attached to the first side of the liquid cooling tray, the first supporting plate of the first supporting rail is attached to the bottom surface of the liquid cooling tray in the area close to the first rod, the second rod of the second supporting rail is attached to the second side of the liquid cooling tray, and the second supporting plate of the second supporting rail is attached to the bottom surface of the liquid cooling tray in the area close to the second rod; during hoisting of the battery pack, when the side of the battery pack collides with other objects, the first supporting rail and the second supporting rail directly collide with other objects, avoiding direct collision of other objects with the side of the liquid cooling tray, part of the impact force acting on the first supporting rail or the second supporting rail is absorbed by the first supporting rail or the second supporting rail, and the other part of the impact force is transmitted to the liquid cooling tray through the entire first supporting rail or the entire second supporting rail, reducing the maximum impact force and the local maximum pressure on the side of the liquid cooling tray, thereby reducing the risk of deformation and damage of the liquid cooling tray caused by direct impact of other objects.

[0019] Preferably, the top of the first rod and the top of the second rod are not lower than the top of the liquid cooling tray.

[0020] Through such an arrangement, the first rod and the second rod can more effectively block the impact of other objects on the side of the liquid cooling tray, further reducing the risk of deformation and damage of the liquid cooling tray caused by direct impact of other objects.

[0021] Preferably, the first rod is fixed with a first hoisting member, and the second rod is fixed with a second hoisting member, and the first hoisting member and the second hoisting member are used for connecting hoisting ropes.

[0022] By such an arrangement, compared with the arrangement of hoisting members only on the battery box, the force on the battery box is more balanced, and the deformation of the battery box during hoisting is smaller, thereby reducing the risk of the battery box deforming to squeeze the liquid cooling tray.

[0023] Preferably, the first hoisting fixing member is fixedly connected with the battery box, so that the first supporting rail is fixedly connected with the battery box; and the second hoisting fixing member is fixedly connected with the battery box, so that the second supporting rail is fixedly connected with the battery box.

[0024] By such an arrangement, during hoisting of the battery box, the force points of the battery box are more, and the force on the battery box is more balanced, thereby further reducing the risk of the battery box deforming to squeeze the liquid cooling tray during hoisting. In addition, the first supporting rail and the second supporting rail can fix and strengthen the battery box, thereby reducing the risk of the battery box deforming due to vibration and collision during transportation and use, and improving the safety performance of the battery.

[0025] Preferably, at least a part of the top of the liquid cooling tray is not covered by the battery box, and the liquid inlet pipe and the liquid outlet pipe of the liquid cooling tray are arranged in the area of the top of the liquid cooling tray which is not covered by the battery box.

[0026] By such an arrangement, compared with the arrangement of the liquid inlet pipe and the liquid outlet pipe on the side or bottom of the liquid cooling tray, the risk of the liquid inlet pipe and the liquid outlet pipe being damaged by collision and leaking is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] The preferred embodiments of the utility model will be described below with reference to the drawings, in which:

[0028] Figure 1 is a structure diagram of a battery pack according to an embodiment of the utility model; Figure 1 ;

[0029] Figure 2 is Figure 1 an enlarged view of a partial A in FIG. 1;

[0030] Figure 3 is Figure 1 an enlarged view of a partial B in FIG. 1;

[0031] Figure 4 is Figure 1 an enlarged view of a partial C in FIG. 1;

[0032] Figure 5 is a structure diagram of a battery pack according to an embodiment of the utility model; Figure 2 ;

[0033] Figure 6 is Figure 5 is

[0034] List of reference signs:

[0035] 1, battery box; 2, liquid cooling tray; 21, liquid inlet connecting pipe; 22, liquid outlet connecting pipe; 3, first supporting rail; 31, first rod; 311, first pin shaft; 32, first supporting plate; 4, second supporting rail; 41, second rod; 411, second pin shaft; 42, second supporting plate; 5, first lifting component; 51, first framework; 52, first horizontal connecting plate; 521, first pin hole; 53, first vertical connecting plate; 54, first ear plate; 541, first lifting hole; 6, second lifting component; 61, second framework; 62, second horizontal connecting plate; 621, second pin hole; 63, second vertical connecting plate; 64, second ear plate; 641, second lifting hole. DETAILED DESCRIPTION

[0036] Firstly, those skilled in the art should understand that the embodiments described below are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.

[0037] It should be noted that in the description of the utility model, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, it should also be noted that in the description of the utility model, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, it can be direct connection, or indirect connection. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] Based on the problem of the side part of the cooling tray being easily deformed and damaged by knocking during the lifting process of the battery pack mentioned in the background art, the utility model provides a battery pack, which comprises: a battery box, which is provided with battery cells inside; a liquid cooling tray, which is fixed at the bottom of the battery box; a first supporting rail, which comprises a horizontally extending first rod and a first supporting plate fixed at the lower part of the first rod, the first supporting plate is attached to the bottom surface of the liquid cooling tray, and the side part of the first rod is attached to the first side edge of the liquid cooling tray, and the first supporting rail is fixedly connected with the battery box and / or the liquid cooling tray; a second supporting rail, which comprises a horizontally extending second rod and a second supporting plate fixed at the lower part of the second rod, the second supporting plate is attached to the bottom surface of the liquid cooling tray, and the side part of the second rod is attached to the second side edge of the liquid cooling tray, and the second supporting rail is fixedly connected with the battery box and / or the liquid cooling tray; wherein the first supporting rail and the second supporting rail are symmetrical about the vertical symmetry plane of the battery box.

[0040] Through the arrangement, the first rod of the first supporting rail is attached to the first side of the liquid cooling tray, the first supporting plate of the first supporting rail is attached to the bottom surface of the liquid cooling tray near the area of the first rod, the second rod of the second supporting rail is attached to the second side of the liquid cooling tray, and the second supporting plate of the second supporting rail is attached to the bottom surface of the liquid cooling tray near the area of the second rod; during hoisting of the battery pack, when the side of the battery pack collides with other objects, the first supporting rail and the second supporting rail directly collide with the other objects, avoiding that the other objects directly collide with the side of the liquid cooling tray, part of the impact force acting on the first supporting rail or the second supporting rail is absorbed by the first supporting rail or the second supporting rail, and the other part of the impact force is transmitted to the liquid cooling tray through the whole first supporting rail or the whole second supporting rail, so that the maximum impact force and the local maximum pressure on the side of the liquid cooling tray are reduced, thereby reducing the risk of deformation and damage of the liquid cooling tray caused by direct impact of the other objects.

[0041] Reference will be made to the drawings below Figures 1 to 6 The battery pack of the utility model is introduced in detail. Among them, Figure 1 is a structural schematic diagram of the battery pack of an embodiment of the utility model Figure 1 ; Figure 2 is an enlarged view of part A in Figure 1 ; Figure 3 is an enlarged view of part B in Figure 1 ; Figure 4 is an enlarged view of part C in Figure 1 ; Figure 5 is a structural schematic diagram of the battery pack of an embodiment of the utility model Figure 2 ; Figure 6 is an enlarged view of part D in Figure 5 .

[0042] As shown in Figures 1 to 6 , the battery pack comprises a battery box 1 and a liquid cooling tray 2 distributed upward and downward, the battery box 1 is a box body with a lower opening (not shown in the figure), the upper surface of the liquid cooling tray 2 is sealingly connected with the edge of the opening of the lower part of the battery box 1, the liquid cooling tray 2 is fixedly connected with the battery box 1 through bolts, the liquid cooling tray 2 and the battery box 1 enclose a containing cavity (not shown in the figure), and the containing cavity is provided with battery cells (not shown in the figure). The liquid cooling tray 2 is formed by laminating and pressing two plate-shaped structure layers, and channels (not shown in the figure) for flowing of cooling liquid (for example, cooling water) are formed between the plate-shaped structure layers of the liquid cooling tray 2. The width (dimension along the left-right direction) of the liquid cooling tray 2 is the same as the width of the battery box 1, and the length (dimension along the front-rear direction) of the liquid cooling tray 2 is the same as the length of the battery box 1. Figure 1 Figure 1 ​The length of the battery box 1 is greater than the length of the liquid-cooled tray 2 in the front-rear direction, the rear side wall of the battery box 1 is aligned with the rear side edge of the liquid-cooled tray 2, the area of the upper surface of the liquid-cooled tray 2 close to the front edge is not covered by the battery box 1, and the liquid inlet pipe 21 and the liquid outlet pipe 22 of the liquid-cooled tray 2 are arranged in the area of the upper surface of the liquid-cooled tray 2 which is not covered by the battery box 1.

[0043] The battery pack further comprises a first supporting rail 3 arranged on the left side of the liquid-cooled tray 2 and a second supporting rail 4 arranged on the right side of the liquid-cooled tray 2, and the first supporting rail 3 and the second supporting rail 4 are symmetrical about the vertical symmetry plane extending in the front-rear direction of the battery box 1. The first supporting rail 3 comprises a first rod 31 extending in the front-rear direction and a first supporting plate 32 fixed to the lower part of the first rod 31, and the second supporting rail 4 comprises a second rod 41 extending in the front-rear direction and a second supporting plate 42 fixed to the lower part of the second rod 41. Specifically, the first supporting plate 32 extends to the right at the bottom of the entire first rod 31, and the first rod 31 and the first supporting plate 32 are integrally bent and formed by a steel plate; the second supporting plate 42 extends to the left at the bottom of the entire second rod 41, and the second rod 41 and the second supporting plate 42 are integrally bent and formed by a steel plate. The top of the first rod 31 is flush with the top of the liquid-cooled tray 2, the right side of the first rod 31 is attached to the left side edge of the liquid-cooled tray 2, and the first supporting plate 32 is attached to the bottom surface of the liquid-cooled tray 2. The top of the second rod 41 is flush with the top of the liquid-cooled tray 2, the left side of the second rod 41 is attached to the right side edge of the liquid-cooled tray 2, and the second supporting plate 42 is attached to the bottom surface of the liquid-cooled tray 2.

[0044] The first supporting rail 3 is fixedly connected with the battery box 1 and the liquid-cooled tray 2, and the second supporting rail 4 is fixedly connected with the battery box 1 and the liquid-cooled tray 2. Specifically, the first supporting plate 32 is fixedly connected with the liquid-cooled tray 2 by bolts, so that the first supporting rail 3 is fixedly connected with the liquid-cooled tray 2; the second supporting plate 42 is fixedly connected with the liquid-cooled tray 2 by bolts, so that the second supporting rail 4 is fixedly connected with the liquid-cooled tray 2. The first rod 31 is fixed with a first hoisting member 5, and the first hoisting member 5 is fixedly connected with the battery box 1, so that the first supporting rail 3 is fixedly connected with the battery box 1; the second rod 41 is fixed with a second hoisting member 6, and the second hoisting member 6 is fixedly connected with the battery box 1, so that the second supporting rail 4 is fixedly connected with the battery box 1.

[0045] The first hoisting member 5 comprises a first framework 51 extending along the axial direction of the first rod member 31, the bottom of the first framework 51 extends a first horizontal connecting plate 52 towards the first rod member 31 and a first vertical connecting plate 53 downwards, the first horizontal connecting plate 52 is attached to the top of the first rod member 31, and the first vertical connecting plate 53 abuts against the right side of the first rod member 31 (i.e. the side facing the liquid cooling tray 2). Two first pin holes 521 are formed on the first horizontal connecting plate 52, and the top of the first rod member 31 is provided with two first pin shafts 311 extending upwards at corresponding positions, the two first pin shafts 311 are respectively matched with the two first pin holes 521 to realize the fixed connection between the first horizontal connecting plate 52 and the first rod member 31. The first framework 51 is provided with a first hoisting structure for connecting hoisting ropes, the first hoisting structure comprises first ear plates 54 arranged at both ends of the first framework 51 respectively, each first ear plate 54 is a U-shaped plate member, a bolt hole is formed on the horizontal plate of the lower part of the U-shaped plate member, a bolt passes through the bolt hole and is fixedly connected with the flange at the bottom of the battery box 1, and a first hoisting hole 541 is formed on each vertical plate of the U-shaped plate member, the first hoisting hole 541 is used for connecting the hoisting ropes.

[0046] The second hoisting member 6 comprises a second framework 61 extending along the axial direction of the second rod member 41, the bottom of the second framework 61 extends a second horizontal connecting plate 62 towards the second rod member 41 and a second vertical connecting plate 63 downwards, the second horizontal connecting plate 62 is attached to the top of the second rod member 41, and the second vertical connecting plate 63 abuts against the left side of the second rod member 41 (i.e. the side facing the liquid cooling tray 2). Two second pin holes 621 are formed on the second horizontal connecting plate 62, and the top of the second rod member 41 is provided with two second pin shafts 411 extending upwards at corresponding positions, the two second pin shafts 411 are respectively matched with the two second pin holes 621 to realize the fixed connection between the second horizontal connecting plate 62 and the second rod member 41. The second framework 61 is provided with a second hoisting structure for connecting hoisting ropes, the second hoisting structure comprises second ear plates 64 arranged at both ends of the second framework 61 respectively, each second ear plate 64 is a U-shaped plate member, a bolt hole is formed on the horizontal plate of the lower part of the U-shaped plate member, a bolt passes through the bolt hole and is fixedly connected with the flange at the bottom of the battery box 1, and a second hoisting hole 641 is formed on each vertical plate of the U-shaped plate member, the second hoisting hole 641 is used for connecting the hoisting ropes.

[0047] The right side of the first rod 31 of the first supporting rail 3 is attached to the left side of the liquid cooling tray 2, the first supporting plate 32 of the first supporting rail 3 is attached to the bottom surface of the liquid cooling tray 2, the left side of the second rod 41 of the second supporting rail 4 is attached to the right side of the liquid cooling tray 2, and the second supporting plate 42 of the second supporting rail 4 is attached to the bottom surface of the liquid cooling tray 2; during the hoisting process of the battery pack, when the side of the battery pack collides with other objects, the first supporting rail 3 and the second supporting rail 4 directly collide with other objects, avoiding the direct collision of other objects to the side of the liquid cooling tray 2, part of the impact force acting on the first supporting rail 3 or the second supporting rail 4 is absorbed by the first supporting rail 3 or the second supporting rail 4, and the other part of the impact force is transmitted to the liquid cooling tray 2 through the entire first supporting rail 3 or the entire second supporting rail 4, reducing the maximum impact force and the local maximum pressure on the side of the liquid cooling tray 2, thereby reducing the risk of deformation and damage of the liquid cooling tray 2 caused by direct impact of other objects.

[0048] The top of the first rod 31 is flush with the top of the liquid cooling tray 2, and the top of the second rod 41 is flush with the top of the liquid cooling tray 2, which can effectively avoid the direct impact of other objects on the side of the liquid cooling tray 2 during the battery pack handling process, reducing the risk of deformation and damage of the liquid cooling tray 2 caused by direct impact of other objects. It should be noted that this is only a more preferred setting, which can be adjusted in actual application, such as in another more preferred setting, the top of the first rod 31 is higher than the top of the liquid cooling tray 2, and the top of the second rod 41 is higher than the top of the liquid cooling tray 2; in another feasible setting, the top of the first rod 31 is lower than the top of the liquid cooling tray 2, and the top of the second rod 41 is lower than the top of the liquid cooling tray 2, only the effect of avoiding the direct impact of other objects on the side of the liquid cooling tray 2 during the battery pack handling process is not as good as that of "the top of the first rod 31 is not lower than the top of the liquid cooling tray 2, and the top of the second rod 41 is not lower than the top of the liquid cooling tray 2".

[0049] The first rod 31 and the first supporting plate 32 are integrally bent and formed by a steel plate, and the second rod 41 and the second supporting plate 42 are integrally bent and formed by a steel plate, which can save the assembly process of the first rod 31 and the first supporting plate 32 and the assembly process of the second rod 41 and the second supporting plate 42, and the connection of the first rod 31 and the first supporting plate 32 and the connection of the second rod 41 and the second supporting plate 42 are more stable. It should be noted that this is only a more preferred setting, which can be adjusted in actual application, such as the first rod 31 and the first supporting plate 32 are respectively manufactured and then fixed and connected by welding, screwing, riveting, etc., and the second rod 41 and the second supporting plate 42 are respectively manufactured and then fixed and connected by welding, screwing, riveting, etc.

[0050] The first rail 3 is fixedly connected with the battery box 1 and the liquid cooling tray 2, and the second rail 4 is fixedly connected with the battery box 1 and the liquid cooling tray 2, so that the stability of the first rail 3 and the second rail 4 is higher, the first rail 3 and the second rail 4 also serve as additional connecting structures of the battery box 1 and the liquid cooling tray 2, so that the connection reliability of the battery box 1 and the liquid cooling tray 2 is higher, the overall rigidity of the battery box 1 and the liquid cooling tray 2 is higher, and the risk of stress deformation of the liquid cooling tray 2 and the battery box 1 is further reduced. It should be noted that this is only a more preferred setting mode, which can be adjusted in actual application, for example, the first rail 3 is fixedly connected with the battery box 1 only and not fixedly connected with the liquid cooling tray 2, and the second rail 4 is fixedly connected with the battery box 1 only and not fixedly connected with the liquid cooling tray 2; for example, the first rail 3 is fixedly connected with the liquid cooling tray 2 only and not fixedly connected with the battery box 1, and the second rail 4 is fixedly connected with the liquid cooling tray 2 only and not fixedly connected with the battery box 1.

[0051] The first hoisting piece 5 is fixed on the first rod 31 and fixedly connected with the battery box 1, so that the first rail 3 is fixedly connected with the battery box 1, and the second hoisting piece 6 is fixed on the second rod 41 and fixedly connected with the battery box 1, so that the second rail 4 is fixedly connected with the battery box 1. Through such a setting, on the one hand, the first rail 3 is fixedly connected with the battery box 1 and the second rail 4 is fixedly connected with the battery box 1, and on the other hand, compared with the mode of arranging the hoisting piece only on the battery box 1, the stress of the battery box 1 is more balanced, the deformation of the battery box 1 during hoisting is smaller, and the risk of the battery box 1 being deformed to press the liquid cooling tray 2 is reduced.

[0052] The first hoisting piece 5 includes a first skeleton 51 extending along the axial direction of the first rod 31, the bottom of the first skeleton 51 extends a first horizontal connecting plate 52 towards the first rod 31, the first horizontal connecting plate 52 is attached to the top of the first rod 31, and the first horizontal connecting plate 52 is fixedly connected with the first rod 31, and the second hoisting piece 6 includes a second skeleton 61 extending along the axial direction of the second rod 41, the bottom of the second skeleton 61 extends a second horizontal connecting plate 62 towards the second rod 41, the second horizontal connecting plate 62 is attached to the top of the second rod 41, and the second horizontal connecting plate 62 is fixedly connected with the second rod 41, so that the contact area of the first hoisting piece 5 with the first rod 31 and the second hoisting piece 6 with the second rod 41 is increased, the stress concentration at the connecting part is reduced, and the connection reliability is improved.

[0053] The bottom of the first frame 51 extends downward with a first vertical connecting plate 53, which abuts against the right side of the first rod 31 (i.e., the side facing the liquid-cooled tray 2). The bottom of the second frame 61 extends downward with a second vertical connecting plate 63, which abuts against the left side of the second rod 41 (i.e., the side facing the liquid-cooled tray 2). Thus, when the first rail 3 and the second rail 4 are impacted by other objects, the first vertical connecting plate 53 and the second vertical connecting plate 63 can absorb part of the impact force and transfer part of the impact force to the battery box 1 through the first frame 51 and the second frame 61, further reducing the impact force on the liquid-cooled tray 2 and lowering the risk of deformation and damage to the liquid-cooled tray 2. It should be noted that this is only a preferred configuration; adjustments can be made in practical applications, such as not providing the downward-extending first vertical connecting plate 53 at the bottom of the first frame 51, and not providing the downward-extending second vertical connecting plate 63 at the bottom of the second frame 61.

[0054] The liquid inlet pipe 21 and liquid outlet pipe 22 of the liquid cooling tray 2 are located on the upper surface of the liquid cooling tray 2 in the area not covered by the battery box 1. Compared with the method of setting the liquid inlet pipe 21 and liquid outlet pipe 22 on the side or bottom of the liquid cooling tray 2, the risk of liquid leakage caused by collision damage to the liquid inlet pipe 21 and liquid outlet pipe 22 is reduced.

[0055] It should be noted that the width of liquid cooling tray 2 (along...) Figure 1 The width of the liquid cooling tray 2 (in the left-right direction) is the same as the width of the battery box 1, and the length of the liquid cooling tray 2 (along the left-right direction) is the same as the width of the battery box 1. Figure 1 The dimensions (in the front-to-back direction) are greater than the length of the battery box 1. The rear sidewall of the battery box 1 is aligned with the rear edge of the liquid-cooled tray 2. The upper surface of the liquid-cooled tray 2 is not covered by the battery box 1 in the area near the front edge. This is only one specific arrangement and can be adjusted in actual applications. For example, the length and width of the liquid-cooled tray 2 can both be greater than the length of the battery box 1. The upper surface of the liquid-cooled tray 2 is not covered by the battery box 1 in the annular area near the four edges, or other dimensional settings can be used to ensure that at least a portion of the upper surface of the liquid-cooled tray 2 is not covered by the battery box 1. The liquid inlet pipe 21 and liquid outlet pipe 22 of the liquid-cooled tray 2 are located in the area of ​​the upper surface of the liquid-cooled tray 2 not covered by the battery box 1. Alternatively, the liquid inlet pipe 21 and liquid outlet pipe 22 of the liquid-cooled tray 2 are located in the area of ​​the upper surface of the liquid-cooled tray 2 not covered by the battery box 1. This is only a preferred arrangement and can be adjusted in actual applications. For example, the liquid inlet pipe 21 and liquid outlet pipe 22 of the liquid-cooled tray 2 can be located on the front or rear side of the liquid-cooled tray 2.

[0056] It also needs to be explained that the first hoisting structure includes the first lug plate 54 arranged at both ends of the first skeleton 51, each first lug plate 54 is a U-shaped plate piece, a bolt hole is formed on the horizontal plate at the lower part of the U-shaped plate piece, the bolt passes through the bolt hole and is fixedly connected with the flange at the bottom of the battery box 1, a first hoisting hole 541 is formed on the two vertical plates of the U-shaped plate piece respectively, and the first hoisting hole 541 is used for connecting a hoisting rope, the second hoisting structure includes the second lug plate 64 arranged at both ends of the second skeleton 61, each second lug plate 64 is a U-shaped plate piece, a bolt hole is formed on the horizontal plate at the lower part of the U-shaped plate piece, the bolt passes through the bolt hole and is fixedly connected with the flange at the bottom of the battery box 1, a second hoisting hole 641 is formed on the two vertical plates of the U-shaped plate piece respectively, and the second hoisting hole 641 is used for connecting a hoisting rope, which is only a specific setting mode, and in actual application, it can be adjusted, for example, the first hoisting structure includes the first lug plate 54 arranged at one end of the first skeleton 51, and the second hoisting structure includes the second lug plate 64 arranged at one end of the second skeleton 61; for example, the first lug plate is an L-shaped or a straight-shaped plate piece, and the second lug plate is an L-shaped or a straight-shaped plate piece. In addition, the first supporting plate 32 and the liquid cooling tray 2 are fixedly connected through bolts, and the second supporting plate 42 and the liquid cooling tray 2 are fixedly connected through bolts, which is also a specific setting mode, and in actual application, it can be adjusted, for example, the first supporting plate 32 and the liquid cooling tray 2 are riveted or welded, and the second supporting plate 42 and the liquid cooling tray 2 are riveted or welded. In addition, the battery box 1 is a box body with an open lower part (not shown in the figure), the upper surface of the liquid cooling tray 2 is sealingly connected with the edge of the opening at the lower part of the battery box 1, and the liquid cooling tray 2 and the battery box 1 form a containing cavity, which is also a specific setting mode, and in actual application, it can be adjusted, for example, the battery box 1 is a box body formed by six side plates, the six side plates form a containing cavity, and the containing cavity is used for arranging battery cells. The liquid cooling tray 2 is attached to the bottom side plate of the battery box 1.

[0057] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery box in which a battery cell is arranged; a liquid cooling tray fixed to the bottom of the battery box; a first supporting rail comprising a first horizontal rod and a first supporting plate fixed to the lower part of the first horizontal rod, the first supporting plate being attached to the bottom surface of the liquid cooling tray, the side part of the first horizontal rod being attached to the first side edge of the liquid cooling tray, the first supporting rail being fixedly connected with the battery box and / or the liquid cooling tray; a second supporting rail comprising a second horizontal rod and a second supporting plate fixed to the lower part of the second horizontal rod, the second supporting plate being attached to the bottom surface of the liquid cooling tray, the side part of the second horizontal rod being attached to the second side edge of the liquid cooling tray, the second supporting rail being fixedly connected with the battery box and / or the liquid cooling tray; wherein the first supporting rail and the second supporting rail are symmetrical about the vertical symmetry plane of the battery box.

2. The battery pack of claim 1, wherein, The top part of the first horizontal rod and the second horizontal rod is not lower than the top part of the liquid cooling tray.

3. The battery pack of claim 1, wherein, The first lifting member is fixed to the first horizontal rod, and the second lifting member is fixed to the second horizontal rod, the first lifting member and the second lifting member being used for connecting a lifting rope.

4. The battery pack of claim 3, wherein, The first lifting member is fixedly connected with the battery box, so that the first supporting rail is fixedly connected with the battery box; The second lifting member is fixedly connected with the battery box, so that the second supporting rail is fixedly connected with the battery box.

5. The battery pack of claim 4, wherein, The first supporting plate is fixedly connected with the liquid cooling tray by means of bolts, so that the first supporting rail is fixedly connected with the liquid cooling tray; The second supporting plate is fixedly connected with the liquid cooling tray by means of bolts, so that the second supporting rail is fixedly connected with the liquid cooling tray.

6. The battery pack of claim 3, wherein, The first lifting member comprises a first skeleton extending along the axial direction of the first horizontal rod, the bottom part of the first skeleton extending towards the first horizontal rod has a first horizontal connecting plate, the first horizontal connecting plate being attached to and fixedly connected with the top part of the first horizontal rod, the first skeleton being fixedly connected with the battery box, and the first skeleton being provided with a first lifting structure for connecting a lifting rope; The second lifting member comprises a second skeleton extending along the axial direction of the second horizontal rod, the bottom part of the second skeleton extending towards the second horizontal rod has a second horizontal connecting plate, the second horizontal connecting plate being attached to and fixedly connected with the top part of the second horizontal rod, the second skeleton being fixedly connected with the battery box, and the second skeleton being provided with a second lifting structure for connecting a lifting rope.

7. The battery pack of claim 6, wherein, The bottom part of the first skeleton further extends downwards to have a first vertical connecting plate, the first vertical connecting plate abutting against the side part of the first horizontal rod towards the liquid cooling tray; The bottom part of the second skeleton further extends downwards to have a second vertical connecting plate, the second vertical connecting plate abutting against the side part of the second horizontal rod towards the liquid cooling tray.

8. The battery pack of claim 6, wherein, The first lifting structure comprises a first ear plate arranged at at least one end of the first skeleton, the first ear plate being formed with a first lifting hole; The second lifting structure comprises a second ear plate arranged at at least one end of the second skeleton, the second ear plate being formed with a second lifting hole.

9. The battery pack of claim 8, wherein, The first lug plate is fixedly connected with the battery box by bolts, so that the first framework is fixedly connected with the battery box; The second lug plate is fixedly connected with the battery box by bolts, so that the second framework is fixedly connected with the battery box.

10. The battery pack of any one of claims 1-9, wherein, At least a part of the top of the liquid cooling tray is not covered by the battery box, and the liquid inlet pipe and the liquid outlet pipe of the liquid cooling tray are arranged in the area of the top of the liquid cooling tray which is not covered by the battery box.

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