Battery pack box body, power battery and electric automobile

Abstract

The invention discloses a battery pack box used for an electric vehicle, the battery pack box comprises a bottom shell used for packaging the battery pack box, and the battery pack box is characterized by comprising a bearing frame used for supporting a battery module in the battery pack box and comprising a frame body; the lifting lug assemblies are respectively arranged on the opposite side surfaces of the frame body, are fixedly connected with the frame body and are used for mounting the battery pack box body on the electric automobile; the reinforcing beam assembly is fixedly connected with the frame body and comprises a first beam and a second beam, the first beam and the second beam are arranged at the bottom of the frame body in a crossed mode, and the reinforcing beam assembly is used for bearing the battery module; wherein the bottom shell covers the bottom of the bearing frame. According to the battery pack box body, the bearing frame is firstly constructed to form the closed frame structure, and then the battery module is supported by the frame structure, so that the modality of the battery pack box body can be improved, the stress of the bottom shell can be reduced, and the risk of breakage of the battery pack box body caused by stress integration can be reduced. The invention also discloses a power battery and an electric vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack case, a power battery and an electric vehicle. Background Art

[0002] As a core component of power batteries, the battery pack case has increasingly stringent design requirements, cost requirements, manufacturing precision requirements, and production efficiency requirements. In the prior art, the battery pack case is typically a sheet metal case, consisting of components such as an inner lining plate, crossbeams, longitudinal beams, lifting lugs, and brackets. The crossbeams and longitudinal beams are welded to the inside of the battery pack case, specifically to the inner lining plate, to meet the assembly requirements of parts such as the battery module, battery disconnect unit (BDU), and battery management system (BMS). The inner lining plate is a basin structure that meets the sealing requirements of the power battery and supports the various components located within the battery pack case. The lifting lugs are welded to the outside of the battery pack case to meet the assembly requirements of the battery case and the entire vehicle. However, in the above-mentioned battery pack cases of the prior art, since various components are directly mounted on the inner lining plate and connected through the inner lining plate, the inner lining plate plays a supporting role for the battery modules, crossbeams, longitudinal beams, and other components within the battery pack case. During use, stress concentration is very likely to occur on the inner lining plate, which is prone to rupture, resulting in failure of the battery pack case seal and affecting its use. Summary of the Invention

[0003] To solve the above technical problems, an embodiment of the present invention discloses a battery pack case.

[0004] In a first aspect, the present invention provides a battery pack case for an electric vehicle, comprising a bottom shell, the bottom shell being used to encapsulate the battery pack case, comprising:

[0005] The carrier frame is used to support the battery module in the battery pack box, including:

[0006] frame;

[0007] The lifting lug assemblies are respectively provided on opposite sides of the frame and fixedly connected to the frame, and are used to install the battery pack box into the electric vehicle;

[0008] A reinforcing beam assembly is fixedly connected to the frame, and includes a first beam and a second beam. The first beam and the second beam are cross-arranged at the bottom of the frame. The reinforcing beam assembly is used to receive the battery module.

[0009] The bottom shell is covered on the bottom of the carrying frame.

[0010] By adopting the above technical solution, in the battery pack case of the present invention, the lifting ear assembly and the reinforcing beam assembly can be overlapped to form a load-bearing frame. The load-bearing frame is a closed frame structure that can support the battery module. As a result, the bottom shell covering the bottom of the load-bearing frame can no longer play a major supporting role for the battery module, which can reduce the stress on the bottom shell and reduce the risk of stress integration leading to rupture of the bottom shell, thereby helping to reduce the risk of battery pack case sealing failure and improve the reliability of the battery pack case.

[0011] Optionally, the bottom shell includes an inner bottom panel and side beams, the side beams are arranged around the circumferential edge of the inner bottom panel, and the inner bottom panel and the side beams are formed in one piece.

[0012] Optionally, it also includes:

[0013] The impact-resistant cross beam is provided at the bottom of the bottom shell and is a plate-like structure protruding relative to the bottom of the bottom shell. A cavity is formed between the cross beam and the bottom of the bottom shell. Both ends of the impact-resistant cross beam are respectively connected to the lifting ear assemblies.

[0014] Optionally, the battery pack case and the electric vehicle are electrically connected via a connector, and the battery pack case further comprises:

[0015] The connector panel assembly is located in the bottom shell and is fixedly connected to the inner wall of the side beam, including:

[0016] The back of the connector panel is welded and fixed to the inner wall of the side beam;

[0017] A rivet nut is riveted to the connector panel, and the rivet nut includes a flange head, which is located on the back of the connector panel;

[0018] The connector includes a conductive terminal and a bolt. The conductive terminal passes through the side beam and the connector panel from the outer wall of the side beam, and is then electrically connected to the battery module in the battery pack box. The bolt passes through the outer wall of the side beam and is threadedly connected to the flange head, thereby fixing the connector to the side beam.

[0019] Optionally, the back side of the connector panel faces the inner wall of the side beam and is in contact with the inner wall of the side beam. A groove is provided on the back side, and a cavity is formed between the groove and the inner wall of the side beam. The flange head of the rivet nut penetrates from the front side of the connector panel and is located in the cavity.

[0020] Optionally, a cavity enclosed between the groove and the side beam is filled with a sealing member, which is one or more of sealing glue, sealing foam, and sealing rubber strip.

[0021] Optionally, the connector panel is provided with perforations, which include a first perforation and a second perforation arranged at intervals, the bottoms of the first perforation and the second perforation are connected, the interval between the first perforation and the second perforation is a partition, and the partition extends from the top to the bottom of the perforation and crosses the center connecting line of the first perforation and the second perforation; the conductive terminal passes through the first perforation and the second perforation from the outer wall of the side beam and abuts against the inner circumferential wall of the first perforation and the inner circumferential wall of the second perforation.

[0022] Optionally, the side beam extends along a first direction, and the lifting lug assembly includes:

[0023] The first lifting lug includes:

[0024] The first ear plate is provided with a first ear hole, and the battery pack box is hoisted to the electric vehicle through the first ear hole;

[0025] A support plate is provided at the bottom of the frame to support the frame;

[0026] The vertical plate has two sides along the height direction connected to the first ear plate and the support plate respectively, and the vertical plate forms an angle with the connection between the first ear plate and the support plate. The vertical plate and the outer wall of the side beam are arranged opposite to each other along the second direction. The vertical plate is fixedly connected to the outer wall of the side beam, and the second direction is perpendicular to the first direction and the height direction.

[0027] Optionally, the lifting lug assembly further includes:

[0028] The rib plate is perpendicular to the first direction and is arranged between the vertical plate and the outer wall of the side beam in the second direction. The rib plate has a bottom edge, and a first side edge and a second side edge opposite to each other in the second direction. The first side edge is fixedly connected to the vertical plate, the second side edge is fixedly connected to the outer wall of the side beam, and the bottom edge is fixedly connected to the support plate.

[0029] Optionally, the lifting eye assembly further includes:

[0030] A first flange is provided on the first side and bottom edge, and the rib plate is fixed to the support plate and the vertical plate through the first flange;

[0031] The second flange is provided on the second side, and the rib plate is fixed to the outer wall of the side beam through the second flange.

[0032] Optionally, the lifting eye assembly further includes:

[0033] The second hanging ear is provided on the back side of the first hanging ear and includes:

[0034] The second ear plate is located below the first ear plate and is provided with a second ear hole. The central axis of the second ear hole coincides with the central axis of the first ear hole in the height direction of the battery pack box;

[0035] The ear bushing is arranged in the first ear hole and the second ear hole;

[0036] The second lifting ear is fitted with the supporting plate and the vertical plate, and the second lifting ear is fixedly connected to the first lifting ear, so that the lifting ear bushing is fixedly clamped between the first ear plate and the second ear plate.

[0037] Optionally, the battery pack case further includes:

[0038] The reinforcing plate is located between the second beam and the inner wall of the side beam in the second direction, and the second flange, the side beam and the reinforcing plate are fixed by screw connection.

[0039] Optionally, the side beam is stepped, including:

[0040] A first step, comprising a first tread and a first riser;

[0041] The second step is connected to the bottom of the first step and includes a second tread and a second riser, and the second tread is connected to the first riser;

[0042] The reinforcing plate is fitted and fixed to the first riser, the second tread and the second riser.

[0043] Optionally, the height of the second beam is flush with the height of the second step, the second beam extends along the second direction, and the end of the second beam along the second direction is provided with an end flange, which is fit and fixed to the second riser and the second tread to fix the second beam to the reinforcement plate.

[0044] In a second aspect, the present invention provides a power battery, comprising a battery pack case as described in any one of the first aspects above.

[0045] By adopting the above technical solution, in the battery pack case used in the power battery of the present invention, the lifting ear assembly and the reinforcing beam assembly can be overlapped to form a load-bearing frame. The load-bearing frame is a closed frame structure that can support the battery module, so that the bottom shell covering the bottom of the load-bearing frame can no longer play a major supporting role for the battery module, which can reduce the stress on the bottom shell and reduce the risk of stress integration causing the bottom shell to rupture, thereby helping to reduce the risk of battery pack case sealing failure, improve the reliability of the battery pack case, and further improve the reliability of the power battery.

[0046] In a third aspect, the present invention provides an electric vehicle comprising the power battery as described in the second aspect.

[0047] By adopting the above technical solution, in the power battery used in the electric vehicle of the present invention, in the battery pack case part, the ear assembly and the reinforcing beam assembly can be overlapped to form a load-bearing frame. The load-bearing frame is a closed frame structure that can support the battery module, so that the bottom shell covering the bottom of the load-bearing frame can no longer play the main supporting role for the battery module, which can reduce the stress on the bottom shell and reduce the risk of stress integration causing the bottom shell to rupture, thereby helping to reduce the risk of battery pack case sealing failure, improve the reliability of the battery pack case, and further improve the reliability of the power battery, which helps to improve the reliability of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram showing the three-dimensional structure of a battery pack box according to an embodiment of the present invention is shown;

[0049] Figure 2 A front view of a battery pack case according to an embodiment of the present invention is shown;

[0050] Figure 3 A cross-sectional view taken along line BB in a front view of a battery pack case according to an embodiment of the present invention is shown;

[0051] Figure 4 Shows a rear view of a battery pack case according to an embodiment of the present invention;

[0052] Figure 5 Shows a front view of a frame according to an embodiment of the present invention;

[0053] Figure 6 Shows a rear view of the frame in an embodiment of the present invention;

[0054] Figure 7 A bottom view of a frame according to an embodiment of the present invention is shown;

[0055] Figure 8 Shows a right side view of the frame in an embodiment of the present invention;

[0056] Figure 9 A schematic diagram showing the three-dimensional structure of the bottom shell in an embodiment of the present invention is shown;

[0057] Figure 10 Shows a front view of the bottom housing in an embodiment of the present invention;

[0058] Figure 11 A cross-sectional view of an impact-resistant beam according to an embodiment of the present invention is shown;

[0059] Figure 12 A schematic diagram showing a partial three-dimensional structure of a connector panel assembly of a battery pack case according to an embodiment of the present invention;

[0060] Figure 13 A schematic diagram showing the three-dimensional structure of a connector panel assembly according to an embodiment of the present invention is shown;

[0061] Figure 14 A front view of a connector panel assembly according to an embodiment of the present invention is shown;

[0062] Figure 15 A rear view of a connector panel assembly according to an embodiment of the present invention is shown;

[0063] Figure 16 A top view of a connector panel assembly according to an embodiment of the present invention is shown;

[0064] Figure 17 A right side view of a connector panel assembly according to an embodiment of the present invention is shown;

[0065] Figure 18 A schematic diagram showing the three-dimensional structure of the connector inserted into the through-hole according to an embodiment of the present invention is shown;

[0066] Figure 19 A schematic diagram of a three-dimensional structure of an existing perforation in the prior art is shown;

[0067] Figure 20 A schematic diagram showing a three-dimensional structure of a connector inserted into an existing through-hole in the prior art is shown;

[0068] Figure 21 A three-dimensional structural diagram of a lifting eye assembly according to an embodiment of the present invention is shown;

[0069] Figure 22 A schematic diagram showing the three-dimensional structure of a lifting ear bracket of a lifting ear assembly according to an embodiment of the present invention is shown;

[0070] Figure 23 A front view of a lifting eye assembly according to an embodiment of the present invention is shown;

[0071] Figure 24 A right side view of the lifting eye assembly according to an embodiment of the present invention is shown;

[0072] Figure 25 A top view of a lifting lug assembly according to an embodiment of the present invention is shown;

[0073] Figure 26 A rear view of the lifting lug assembly according to an embodiment of the present invention is shown;

[0074] Figure 27 A schematic diagram showing a partial three-dimensional structure of a reinforcing plate of a battery pack case according to an embodiment of the present invention;

[0075] Figure 28 An exploded view of a battery pack case in an embodiment of the present invention is shown.

[0076] Explanation of symbols:

[0077] Battery pack case 1; bottom shell 2; inner base plate 21; side beam 22; first tread 221; first riser 222; second tread 223; second riser 224; frame 3; lifting ear assembly 4; first lifting ear 41; first ear plate 411; first ear hole 4111; support plate 412; riser 413; first angle α; second angle β; rib plate 42; first flange 421; second flange 422; second lifting ear 43; second ear plate 431; second ear hole 4311; lifting ear bushing 44; reinforcing beam assembly 5; first beam 51; second beam 52; impact-resistant crossbeam 6; cavity 61; connector 7; conductive terminal 71; connector panel assembly 8; connector panel 81 ; Pull rivet nut 82; Flange head 821; Seal 83; Perforation 84; First perforation 841; Second perforation 842; Connecting channel 843; Partition 85; Existing perforation 081; Reinforcement plate 9; End flange 91; First direction X; Second direction Y; Height direction Z; Length direction L; Width direction S; Right mounting reinforcement bracket 45; Middle lifting lug 46; First lifting lug reinforcement plate 47; Left mounting reinforcement bracket 48; Copper busbar bracket 10; Pressure rivet nut column 11; Welded hexagonal nut 12; Wire harness bracket 13; Bearing surface projection welding bolt 14; Welded square nut 15; L-shaped wire harness bracket 16; L bracket 17; BMS mounting bracket 18; Guard plate bracket 19; Extruded beam 20 DETAILED DESCRIPTION

[0078] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0079] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0080] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0081] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0082] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0083] First, reference Figure 1 Combined with Figure 5 The present invention provides a battery pack box 1 for electric vehicles, including a bottom shell 2, which is used to encapsulate the battery pack box 1. The battery pack box 1 includes a supporting frame, which is used to support the battery module in the battery pack box 1. The supporting frame includes a frame 3, a lifting ear assembly 4 and a reinforcing beam assembly 5. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the lug assemblies 4 are respectively provided on the opposite sides of the frame 3 and are fixedly connected to the frame 3 for installing the battery pack box 1 to the electric vehicle. More specifically, the lug assembly 4 is provided along the width direction of the battery pack box 1 (e.g. Figure 1 、 Figure 2 、 Figure 4-Figure 6 、 Figure 8-Figure 9 The reinforcing beam assembly 5 is fixedly connected to the frame 3 and comprises a first beam 51 and a second beam 52. The first beam 51 and the second beam 52 are intersectingly arranged at the bottom of the frame 3. The reinforcing beam assembly 5 is used to support the battery module. The bottom housing 2 covers the bottom of the carrier frame and provides a seal for the battery pack.

[0084] Through the above technical solution, in the battery pack case 1 of the present invention, the ear assembly 4 and the reinforcing beam assembly 5 can be overlapped to form a load-bearing frame. The load-bearing frame is a closed frame structure that can support the battery module, so that the bottom shell 2 wrapped around the bottom of the load-bearing frame can no longer play a major supporting role for the battery module, which can reduce the stress on the bottom shell 2 and reduce the risk of stress integration causing the bottom shell 2 to rupture, thereby helping to reduce the risk of sealing failure of the battery pack case 1 and improve the reliability of the battery pack case 1.

[0085] Furthermore, in the prior art, crossbeams and longitudinal beams are typically attached separately to the inner lining plate, resulting in complex manufacturing and assembly processes. Furthermore, the inner lining plate needs to support the crossbeams and longitudinal beams, subjecting the inner lining plate to significant forces. In this embodiment, however, first beams 51 and second beams 52 (equivalent to the crossbeams and longitudinal beams in the prior art) are first welded together to form a single unit, forming the reinforcement beam assembly 5. There is at least one first beam 51, and there are multiple second beams 52. Figure 5 In the illustrated embodiment, specifically, a first beam 51 (which can be called a longitudinal beam, for example) and three second beams 52 (which can be called cross beams, and further can be respectively called front cross beams, middle cross beams and rear cross beams) are first welded to form a reinforcing beam assembly 5. After the reinforcing beam assembly 5 is first formed, the reinforcing beam assembly 5 can be welded together as a whole to the bottom shell 2. By first welding the first beam 51 and the second beam 52 to form the reinforcing beam assembly 5, and then welding the reinforcing beam assembly 5 as a whole to the bottom shell 2, when manufacturing the battery pack case 1, multiple production lines can be divided, one of which welds the first beam 51 and the second beam 52 to form the reinforcing beam assembly 5, and then puts the welded reinforcing beam assembly 5 into the welding assembly production line to weld the reinforcing beam assembly 5 to the bottom shell 2, thereby eliminating the need to set up too many processes on the same production line, reducing the number of processes on a production line, increasing production speed, and shortening manufacturing time.

[0086] Furthermore, in this embodiment, the second beam 52 is arranged along the second direction (eg Figure 21 and Figure 27 The direction Y in the Figure 5 The second beam 52 can be extended in the direction S). In this case, the second beam 52 can also be called a transverse beam. The first beam 51 can be arranged perpendicular to the second beam 52, in which case the first beam 51 can be called a longitudinal beam. By arranging the first beam 51 and the second beam 52 perpendicular to each other, an orthogonal stiffness network can be formed, distributing multi-dimensional loads and achieving higher stability.

[0087] Furthermore, in the prior art, the lifting lugs are welded to the outside of the inner lining plate, while the crossbeams and longitudinal beams are welded to the inside of the inner lining plate. The lifting lugs are not directly connected to the crossbeams and longitudinal beams, but rather are connected through the inner lining plate. With this prior art connection method, if the inner lining plate is damaged, the connections between the lifting lugs, crossbeams, and longitudinal beams and the inner lining plate will also be extremely susceptible to damage, resulting in a high degree of damage to the entire battery pack case 1. In the above-described embodiment, the load-bearing frame is more specifically formed by the lifting lug assembly 4 and the reinforcing beam assembly 5. The lifting lug assembly 4 and the reinforcing beam assembly 5 are directly fixedly connected, and can be overlapped and welded to form a closed frame structure. This arrangement, the lifting lug assembly 4 and the reinforcing beam assembly 5, overlapped and welded to form an internal reinforcement structure, not only meets the installation requirements of the battery module, but also improves the rigidity of the battery pack case 1 through the formed closed frame structure, ensuring that the battery pack case 1 meets structural requirements, improving the extrusion resistance and impact resistance of the battery pack case 1, and improving the modal properties of the battery pack case 1. The aforementioned load-bearing frame, which includes the lifting lug assembly 4 and the reinforcing beam assembly 5, can also support the battery modules within the battery pack case 1, thereby reducing the stress on the bottom shell 2 and the risk of the battery pack case 1 rupturing due to stress integration. The bottom shell 2 can then primarily serve as a seal, thereby reducing the risk of seal failure. Even if the bottom shell 2 is damaged, it will not affect the closed frame structure formed by the lifting lug assembly 4 and the reinforcing beam assembly 5, and can still support the battery modules within the battery pack case 1. The entire battery pack case 1 will also be less susceptible to damage, making it easier to repair.

[0088] Furthermore, in conjunction with reference Figure 7 and Figure 8 The lifting lug assemblies 4 are symmetrically arranged on opposite sides of the frame 3 along the width direction. With this arrangement, when the battery pack case 1 is installed on the electric vehicle via the lifting lug assemblies 4, the frame 3 is subjected to symmetrical forces, and the tension on both sides during lifting is equal, so that the battery pack case 1 can remain horizontal, reducing the risk of tilting or overturning caused by center of gravity shift. It can also minimize the torsional torque on the battery pack case 1, reduce stress concentration at the welds, and thus reduce the risk of deformation or cracking of the battery pack case 1 during lifting.

[0089] In the above embodiment, if Figure 9 and Figure 10 As shown, the bottom shell 2 includes an inner bottom plate 21 and a side beam 22. The side beam 22 is arranged around the circumferential edge of the inner bottom plate 21. The side beam 22 is arranged along a first direction (for example, Figure 9-10 、 Figure 12 and Figure 27The side beams 22 extend in the direction X) in the inner bottom panel 21. The side beams 22 are provided at the four edges of the inner bottom panel 21. The extending direction of the side beams 22 at each edge can be considered as the first direction, that is, the first direction can be understood as the circumferential direction of the bottom housing 2. The inner bottom panel 21 and the side beams 22 are integrally formed.

[0090] In the prior art, the inner lining plate needs to bear the pressure of multiple components such as crossbeams, longitudinal beams, and battery modules to support these components, which places extremely high demands on the strength of the inner lining plate. Side beams are provided at the circumferential edges of the inner lining plate. In the prior art, the inner lining plate and the side beams arranged on both sides of the inner lining plate relative to each other in the width direction are usually set as independent single components, and different steel materials are selected for each. Such side beams in the prior art are also connected to the lifting lugs, which are used to lift the battery pack box onto the battery car. In the prior art, the side beams located on both sides of the inner lining plate not only need auxiliary lifting lugs to achieve the lifting function, but also need to be connected to the inner lining plate to apply tension to the inner lining plate. Since the inner lining plate supports the battery modules, crossbeams, and longitudinal beams in the battery pack box, the tension applied by the side beams on the inner lining plate will also be greater, and the side beams will be subjected to greater stress. Therefore, in the prior art, higher-strength steel is usually selected when manufacturing the side beams. After the inner lining plate and side beams are manufactured separately, the inner lining plate and the side beams are welded and fixed. However, the manufacturing process of this method in the existing technology is complicated, and since higher-strength steel is selected for the side beams, the weight and cost are also higher. The inner lining plate and the side beams need to be welded. When the split inner lining plate and side beams are welded, the risk of sealing failure at the joints is also high.

[0091] In this embodiment, since the lifting ear assembly 4 and the reinforcing beam assembly 5 have formed a supporting frame that can support the battery module, the force on the bottom shell 2 is reduced, and thus the strength requirement for the bottom shell 2 is not as high as that in the prior art. There is no need to use the inner lining plate and side beam welded structure of the prior art. The inner lining plate 21 and the side beam 22 of the bottom shell 2 can be stamped into one piece, and the same material of steel can be used, thereby simplifying the manufacturing process, improving production efficiency, reducing weight, reducing costs, and avoiding the risk of sealing failure between the inner lining plate and side beam formed by split welding.

[0092] In the above embodiments, reference Figure 11 Combined with Figure 4 、 Figure 5 and Figure 6 The battery pack body 1 also includes an impact-resistant beam 6. Figure 11 The cross-sectional structure diagram of the connection between the lifting eye assembly 4 and the anti-impact beam 6 on one side is shown. The anti-impact beam 6 is provided at the bottom of the bottom shell 2 and is a plate-like structure protruding relative to the bottom of the bottom shell 2. A cavity 61 is formed between the anti-impact beam 6 and the bottom of the bottom shell 2. The two ends of the anti-impact beam 6 are respectively connected to the lifting eye assembly 4. The lifting eye assembly 4 includes a support plate 412, as shown in FIG. Figure 21 As shown, the impact-resistant cross beam 6 is more specifically fixedly connected to the support plate 412 of the lifting eye assembly 4 .

[0093] In the prior art, an impact-resistant crossbeam is usually not provided at the bottom of the battery pack case. Even if an impact-resistant crossbeam is provided, the impact-resistant crossbeam is only fixedly connected to the inner lining plate, and is not directly fixedly connected to the lugs on both sides of the inner lining plate. Such battery pack cases in the prior art have poor rigidity and poor bottom protection. In this embodiment, by providing an impact-resistant crossbeam 6 at the bottom of the battery pack case 1, and fixing the impact-resistant crossbeam 6 to two lug assemblies 4 relatively provided on both sides of the frame 3, the lug assemblies 4 on both sides can be connected in the width direction of the battery pack case 1, thereby improving the structural strength and anti-extrusion performance of the battery pack case 1 in the width direction. The impact-resistant crossbeam 6 also forms a cavity 61 with the bottom of the bottom shell 2, which can further improve the impact resistance (such as anti-ball impact performance) of the bottom of the battery pack case 1. At the same time, during the manufacturing process of the battery pack case 1, it is necessary to apply an anti-corrosion coating on the surface of each component of the battery pack case 1 by electrophoretic coating. The structure of the cavity 61 also facilitates the entry and discharge of the electrophoretic liquid to ensure that the electrophoretic thickness meets the design requirements and meets the anti-corrosion requirements and salt spray requirements.

[0094] In the above embodiments, reference Figure 12 Combined with Figure 18 The battery pack case 1 and the electric vehicle are electrically connected via a connector 7. The battery pack case 1 also includes a connector panel assembly 8. The connector panel assembly 8 is disposed within the bottom housing 2 and is fixedly connected to the inner wall of the side beam 22. Specifically, the connector panel assembly 8 is disposed on the side beam 22 extending along the width direction of the battery pack case 1. Figure 13 、 Figure 14 and Figure 15 The connector panel assembly 8 includes a connector panel 81 and a rivet nut 82. The back of the connector panel 81 is welded to the inner wall of the side beam 22, and the rivet nut 82 is riveted to the connector panel 81. The rivet nut 82 includes a flange head 821, which is located on the back of the connector panel 81. Figure 18 The connector 7 includes a conductive terminal 71 and a bolt (not shown in the figure). The conductive terminal 71 passes through the side beam 22 and the connector panel 81 from the outer wall of the side beam 22, and is then electrically connected to the battery module in the battery pack box 1. The bolt passes through the outer wall of the side beam 22 and is threadedly connected to the flange head 821, thereby fixing the connector 7 to the side beam 22.

[0095] In the prior art, reference Figure 19 and Figure 20, usually the nut is directly riveted to the side beam, and then the connector 7 is fixed to the side beam by threaded connection between the bolt and the nut, or the connector 7 is directly fixed to the side beam by projection welding the nut and bolt. In the above method, riveting usually requires manual operation. This method of the prior art requires manual riveting of smaller nuts to the side beam of the battery pack box with a larger volume and heavier weight. The overall operation convenience is poor and the labor cost is high. In the method of fixing the connector 7 to the side beam by projection welding nuts and bolts, there are problems of welding position difference and verticality difference. Among them, position refers to the degree of deviation of the actual position of the weld or welded component from the ideal design position, and verticality refers to the deviation of the angle between the welds from the ideal vertical state (90°).

[0096] In this embodiment, by separately setting up the connector panel 81, since the connector panel 81 is relatively small, manual riveting is more convenient to operate. By first forming the connector panel 81 and the rivet nut 82 into a whole to form the connector panel assembly 8, the connector panel assembly 8 can be directly welded to the inner wall of the side beam 22. The welding can be automated by a welding robot, which can further improve the operational convenience and assembly efficiency and reduce labor costs.

[0097] In the above embodiments, continue to refer to Figure 12 Combined with Figure 14 and Figure 15 The back of the connector panel 81 faces the inner wall of the side beam 22 and fits in with the inner wall of the side beam 22. A groove is provided on the back of the connector panel 81. The groove and the inner wall of the side beam 22 form a chamber. The flange head 821 of the rivet nut 82 penetrates from the front of the connector panel 81 and is located in the chamber. Figure 16 and Figure 17 The flange head 821 of the rivet nut 82 is only located in the cavity and does not exceed the cavity. Such a setting can achieve the fit between the back of the connector panel 81 and the inner wall of the side beam 22, so that the connection between the two can be tighter.

[0098] In the above-described embodiments, the chamber enclosed between the groove and the side beam 22 is filled with a sealant 83, which can be one or more of a sealing glue, a sealing foam, and a sealing rubber strip. In other embodiments, the sealant 83 can also be another type of sealing gasket. Specifically, after the connector panel 81 and the rivet nut 82 are riveted together, the sealant 83 can be first provided at the connection between the flange head 821 of the rivet nut 82 and the back of the connector panel 81. This allows the connector panel 81, the rivet nut 82, and the sealant 83 to first form the connector panel assembly 8, which is highly convenient for manual operation. The riveting between the rivet nut 82 and the connector panel 81, combined with the sealant 83, can further enhance the sealing reliability between the connector panel 81 and the inner wall of the side beam 22. Preferably, the sealant 83 can be a sealing glue. Liquid sealing glue can more fully fill the chamber enclosed between the groove and the side beam 22, further enhancing the sealing reliability.

[0099] In the above embodiments, continue to refer to Figure 12 Combined with Figure 14 and Figure 15 The connector panel 81 is provided with a perforation 84, and the perforation 84 includes a first perforation 841 and a second perforation 842 that are spaced apart. Specifically, the first perforation 841 and the second perforation 842 can be spaced apart along a first direction. The bottoms of the first perforation 841 and the second perforation 842 are connected, and the interval between the first perforation 841 and the second perforation 842 is a partition 85, which extends from the top to the bottom of the perforation 84 and crosses the center connection line of the first perforation 841 and the second perforation 842. Specifically, the partition 85 is spaced apart along the height direction (for example, Figure 12-15 The direction Z) extends. Figure 18 As shown, the conductive terminal 71 passes through the first through hole 841 and the second through hole 842 from the outer wall of the side beam 22 and abuts against the inner circumferential wall of the first through hole 841 and the inner circumferential wall of the second through hole 842 .

[0100] Figure 19 The conventional through-hole 081 for accommodating the conductive terminal 71 in the prior art is shown, and no partition exists at the center of the conventional through-hole 081 . Figure 20The schematic diagram shows the structure of the prior art after the conductive terminals 71 are inserted into the existing through-holes 081. A gap exists between the two conductive terminals 71, which may cause shaking during use, and the contact between the conductive terminals 71 and the existing through-holes 081 is not tight. Although there is a gap between the two conductive terminals 71 of the connector 7, in this embodiment, by retaining the partition 85 between the first through-hole 841 and the second through-hole 842, when the two conductive terminals 71 abut against the inner circumferential walls of the first through-hole 841 and the inner circumferential walls of the second through-hole 842, respectively, the contact area between the conductive terminals 71 and the inner circumferential walls of the first through-hole 841 and the inner circumferential walls of the second through-hole 842 is larger than that of the prior art. This increases the grounding contact area, further improving grounding performance and enhancing safety. Furthermore, due to the larger contact area, the contact between the conductive terminals 71 and the inner circumferential walls of the first through-hole 841 and the inner circumferential walls of the second through-hole 842 is more secure and less prone to shaking.

[0101] Furthermore, the bottoms of the first through-hole 841 and the second through-hole 842 are connected via a connecting passage 843. The connector 7 also includes an interlocking terminal (not shown) that can pass through the connecting passage 843 from the outer wall of the side beam 22. In the above embodiments, the connector 7 can specifically be a high-voltage connector.

[0102] In the above embodiments, the side beam 22 extends along the first direction. Figure 21 Combined with Figure 27 , the ear assembly 4 is arranged on both sides of the frame 3 along the second direction, and the second direction may correspond to the width direction of the battery pack box 1. Figure 21 The lifting ear assembly 4 includes a first lifting ear 41. The first lifting ear 41 includes a first ear plate 411, a support plate 412 and a vertical plate 413. The first ear plate 411 is provided with a first ear hole 4111, and the battery pack box is hoisted to the electric vehicle through the first ear hole 4111. The support plate 412 is provided at the bottom of the frame 3 to support the frame 3. The vertical plate 413 is respectively connected to the first ear plate 411 and the support plate 412 on both sides along the height direction, and the vertical plate 413 forms an angle with the connection between the first ear plate 411 and the support plate 412. The vertical plate 413 is arranged opposite to the outer wall of the side beam 22 along the second direction, and the vertical plate 413 is fixedly connected to the outer wall of the side beam 22. The second direction is perpendicular to the first direction and the height direction. Among them, the first lifting ear 41 is specifically stamped as an integral part, and forms an angle with the connection between the vertical plate 413 and the first ear plate 411 and the support plate 412, which can reduce the risk of stress concentration and improve connection reliability when the battery pack box 1 is hoisted onto the electric vehicle.

[0103] The vertical plate 413 can be a vertical plate that is inclined relative to the height direction. The eye assembly 4 also includes a second eye 43, Figure 24The second ear 32 includes a second ear plate 431, and the second ear plate 431 is parallel to the first ear plate 411. Therefore, the angle formed by the connection between the vertical plate 413 and the first ear plate 411 can be considered to be Figure 24 The angle formed at the connection between the vertical plate 413 and the supporting plate 412 can be considered as Figure 24 The second angle β in the . In this embodiment, the first angle α and the second angle β are both obtuse angles. With this arrangement, when the battery pack case 1 is hoisted onto the electric vehicle through the first ear hole 4111, the tension can be transmitted to the vertical plate 413 through the first ear plate 411. The obtuse-angle structure can disperse the tension over a larger area, reducing the risk of cracking. At the same time, during use, such as when the electric vehicle is driving, the battery pack case 1 may be subjected to dynamic loads such as vibration and impact. The above-mentioned obtuse-angle structure can improve the structural strength of the connection between the battery pack case 1 and the electric vehicle, reduce the probability of local fatigue damage, and extend the service life of the lifting ear assembly 4.

[0104] In each of the above embodiments, the lifting ear assembly 4 further includes a rib 42. The rib 42 is perpendicular to the first direction, and is disposed between the vertical plate 413 and the outer wall of the side beam 22 in the second direction. The rib 42 has a bottom edge, and a first side edge and a second side edge opposite to each other in the second direction. The first side edge is fixedly connected to the vertical plate 413, the second side edge is fixedly connected to the outer wall of the side beam 22, and the bottom edge is fixedly connected to the support plate 412. Through the above arrangement, the rib 42 can serve as a transition piece between the first lifting ear 41 and the side beam 22, thereby improving the anti-extrusion performance of the battery pack case 1 in the second direction.

[0105] Furthermore, in the above embodiments, referring to Figure 21 Combined with Figure 22 The lifting lug assembly 4 also includes a first flange 421 and a second flange 422. The first flange 421 is provided on the first side and the bottom edge, and the rib 42 is fixed to the support plate 412 and the vertical plate 413 through the first flange 421. The second flange 422 is provided on the second side, and the rib 42 is fixed to the outer wall of the side beam 22 through the second flange 422. Through the above-mentioned setting method, the first flange 421 and the second flange 422 can absorb the manufacturing tolerance between the first lifting lug 41 and the side beam 22, and be compatible with first lifting lugs 41 and side beams 22 of various sizes, thereby reducing the manufacturing precision requirements for a single component and helping to improve the production speed. At the same time, by providing the first flange 421 and the second flange 422, the area of ​​the welding area between the rib 42 and the support plate 412, the vertical plate 413 and the outer wall of the side beam 22 can also be increased, so that the connection between the rib 42, the first lifting lug 41 and the side beam 22 is more secure and the connection strength is improved.

[0106] In the above embodiments, reference Figure 27The battery pack box 1 further includes a reinforcing plate 9. The reinforcing plate 9 is located between the second beam 52 and the inner wall of the side beam 22 in the second direction. The second flange 422, the side beam 22 and the reinforcing plate 9 are fixed by screw connection. In this embodiment, the second beam 52 is arranged along the second direction (corresponding to Figure 1 The side beam 22 extends in the first direction (the first direction corresponds to Figure 1-Figure 2 、 Figure 4-Figure 6 The length direction L of the battery pack box 1). In the prior art, the cross beam is usually directly welded to the side beam on the inner lining plate by double shielding welding (i.e., carbon dioxide gas shielded welding), which can easily penetrate the side beam, resulting in failure of the sealing of the battery pack box 1. In this embodiment, by welding the second beam 52 to the reinforcing plate 9, the side beam 22 is also welded to the reinforcing plate 9. The reinforcing plate 9 can serve as an intermediate transition structure, which can expand the force-bearing area, share the load of the second beam 52, disperse the stress, and play a role in structural reinforcement. It can also avoid directly welding the second beam 52 to the side beam 22 by double shielding welding, thereby reducing the risk of welding through the side beam 22 and ensuring the sealing performance of the battery pack box 1. Further, in combination with reference Figure 28 , reinforcement plates 9 can be provided at the connections between the plurality of second beams 52 and the side beams 22 to enhance the connection strength.

[0107] In this embodiment, the second flange 422 is welded to the outer wall of the side beam 22, providing a secure connection. The reinforcement plate 9 is positioned between the second beam 52 and the inner wall of the side beam 22 in the second direction. The second flange 422, the side beam 22, and the reinforcement plate 9 are then secured together via threads. By combining welding and threading to securely connect the second flange 422, the side beam 22, and the reinforcement plate 9, the strength of the connection is further enhanced, making the connection more secure and the load-bearing frame structure formed by the lifting lug assembly 4 and the reinforcement beam assembly 5 more secure.

[0108] In the above embodiments, reference Figure 23 、 Figure 24 、 Figure 25 and Figure 26The lifting ear assembly 4 also includes a second lifting ear 43 and a lifting ear bushing 44. The second lifting ear 43 is arranged on the back of the first lifting ear 41. The second lifting ear 43 includes a second ear plate 431. The second ear plate 431 is located below the first ear plate 411 and is provided with a second ear hole 4311. The second ear hole 4311 coincides with the central axis of the first ear hole 4111 in the height direction of the battery pack case 1. There is a gap between the second ear hole 4311 and the first ear hole 4111 in the height direction. The lifting ear bushing 44 is arranged in the first ear hole 4111 and the second ear hole 4311. Among them, the second lifting ear 43 is in contact with the support plate 412 and the vertical plate 413, and the second lifting ear 43 is fixedly connected to the first lifting ear 41, so that the lifting ear bushing 44 is fixedly clamped between the first ear plate 411 and the second ear plate 431. By providing the lifting ear bushing 44 and clamping and fixing the lifting ear bushing 44 through the first lifting ear 41 and the second lifting ear 43, when the battery pack box 1 is hoisted onto the electric vehicle, the lifting ear bushing 44 can protect the second ear hole 4311 and the first ear hole 4111 to reduce wear.

[0109] In the prior art, the ribs are usually first connected to the side beams on the inner lining plate, and then the multiple lifting ears and lifting ear bushings are sequentially connected to the side beams of the inner lining plate. That is, the multiple lifting ears, lifting ear bushings, and ribs in the prior art are all manufactured separately and connected to the side beams separately and sequentially. Each time they are connected, the multiple lifting ears, lifting ear bushings, and ribs, such small components, are sequentially connected to the large component such as the entire battery pack case. The manufacturing precision of the multiple lifting ears, lifting ear bushings, and ribs is high, the manufacturing process is complex, and the cumulative tolerance is large. In the above embodiments, the first lifting ear 41 can be first overlapped and welded with the rib 42 to form a whole to form a lifting ear assembly 4. Then the lifting ear assembly 4 can be welded to the side beam 22 as a whole. By making the first lifting ear 41 and the rib 42 into an assembly structure, the connection between the two can be strengthened, which helps to improve the overall rigidity of the battery pack case 1, and also helps to simplify the manufacturing process. The manufacturing precision of the first lifting ear 41 and the rib 42 can also be reduced. Furthermore, the first lifting ear 41, the rib 42, the first flange 421, and the second flange 422 are first overlapped and welded into a whole to form the lifting ear assembly 4. Furthermore, the first lifting ear 41, the first flange 421, the second flange 422, and the second lifting ear 43 are first overlapped and welded into a whole to form the lifting ear assembly 4. Further still, the first lifting ear 41, the first flange 421, the second flange 422, the second lifting ear 43, and the lifting ear bushing 44 are first overlapped and welded into a whole to form the lifting ear assembly 4. In the above manner, multiple components are first overlapped and welded to form the lifting ear assembly 4, and the lifting ear assembly 4 can be welded to the side beam 22 as a whole, effectively improving the overall rigidity of the battery pack case 1.

[0110] Furthermore, in the above embodiments, continue to refer to Figure 27 , the side beam 22 is stepped. More specifically, with reference to Figure 1 , the side beams 22 opposite to each other along the width direction of the battery pack case 1 are stepped, or it can also be considered that the side beams 22 fixedly connected to the lifting ear assembly 4 are stepped. The side beams 22 include a first step and a second step. The first step includes a first tread 221 and a first kicker 222. The second step is connected to the bottom of the first step in the height direction, and includes a second tread 223 and a second kicker 224, and the second tread 223 is connected to the first kicker 222. Among them, the reinforcing plate 9 is fitted and fixed to the first kicker 222, the second tread 223 and the second kicker 224.

[0111] Different parts of the side beam 22 may bear different loads. By configuring the side beam 22 in a stepped shape, the load can be effectively dispersed, allowing it to withstand forces from multiple directions, such as up, down, left, and right, reducing the risk of stress concentration. Furthermore, the weld area between the reinforcing plate 9 and the side beam 22 can be increased, thereby improving the connection strength.

[0112] refer to Figure 21 The second flange 422 includes a second flange 422 arranged horizontally and a second flange 422 arranged vertically. The second flange 422 arranged vertically may have an angle with the height direction. Figure 21 and Figure 27 By matching the shape of the reinforcing plate 9 with the stepped side beam 22, setting the second side edge of the rib plate 42 to match the stepped side beam 22, and also setting the shape of the second flange 422 to match the stepped side beam 22, more specifically matching the outer wall of the stepped side beam 22, it helps to make the second flange 422, the reinforcing plate 9, and the side beam 22 fit more firmly, thereby strengthening the connection strength between the three.

[0113] In the above embodiments, continue to refer to Figure 27 , the height of the second beam 52 is flush with the height of the second step, and the second beam 52 extends along the second direction. In this case, the second beam 52 can also be called a crossbeam. The first beam 51 can be arranged perpendicular to the second beam 52, in which case the first beam 51 can be correspondingly called a longitudinal beam. The end of the second beam 52 along the second direction is provided with an end flange 91, and the end flange 91 is fitted and fixed with the second kick surface 224 and the second tread 223 to fix the second beam 52 to the reinforcing plate 9, and then fixedly connected to the side beam 22, and fixedly connected to the second flange 422. By providing the end flange 91 at the end of the second beam 52, the angle between the end flange 91 and the second direction can be adjusted, thereby effectively absorbing manufacturing tolerances, reducing manufacturing precision, improving manufacturing feasibility, and helping to improve production efficiency. At the same time, it can also increase the welding area between the second beam 52 and the reinforcing plate 9 and improve the connection strength.

[0114] In the above embodiments, reference Figure 28In the height direction, a middle lug 46 may be provided between the first lug plate 411 and the second lug plate 431. The middle lug 46 is connected to the first lug plate 411 by resistance welding, and to the lug bushing 44 by double-welding. The middle lug 46 can increase the material thickness and rigidity at the lug bushing location, distributing the load and reducing stress concentration points. Furthermore, the presence of the middle lug 46 prevents the first lug plate 411 from being directly connected to the lug bushing 44 by double-welding, reducing or even eliminating the risk of localized thermal embrittlement and cracking of the first lug plate 411 due to welding heat (material embrittlement can easily increase the risk of cracking of the first lug plate 411). A first lug reinforcement plate 47 may also be provided on the back of the first lug 41. The first lug reinforcement plate 47 can fill the welding process hole, increase the connection strength on both sides of the welding process hole, and provide structural reinforcement for the weak position of the vertical plate 413. In the load-bearing frame of the battery pack case 1, copper busbar brackets 10, wiring harness brackets 13 and L-shaped wiring harness brackets 16 can also be set at multiple positions to support the wires and copper busbars that need to be arranged in the battery pack case 1. The battery pack case 1 is also provided with an L bracket 17, a BMS mounting bracket 18, a guard plate bracket 19 and an extruded beam 20 to meet the installation requirements of the battery management system (BMS). Among them, the above-mentioned various components are welded to the battery pack case 1 by resistance welding or two-protection welding, and the corresponding components can be assembled and fixedly connected by press-riveted nut columns 11, welded hexagonal nuts 12, bearing surface projection welding bolts 14 or welded square nuts 15. After the battery pack case 1 is welded, the battery pack case 1 is subjected to electrophoresis as a whole so that the surface of each component is covered with an electrophoretic layer to ensure the corrosion resistance of the battery pack case 1. The bottom of the battery pack box 1 is also covered with a PVC (polyvinyl chloride) coating, which can resist chemical corrosion, wear resistance, salt spray corrosion, and resistance to the impact of bottom gravel, ensuring the safety of the battery pack box 1 during use.

[0115] In a second aspect, the present invention provides a power battery, comprising the battery pack case 1 as described in any one of the first aspects above.

[0116] By adopting the above technical solution, in the battery pack case 1 used in the power battery of the present invention, the ear assembly 4 and the reinforcing beam assembly 5 can be overlapped to form a load-bearing frame. The load-bearing frame is a closed frame structure that can support the battery module, so that the bottom shell 2 covered on the bottom of the load-bearing frame can no longer play a major supporting role for the battery module, which can reduce the stress on the bottom shell 2 and reduce the risk of stress integration causing the bottom shell 2 to rupture, thereby helping to reduce the risk of sealing failure of the battery pack case 1, improve the reliability of the battery pack case 1, and further improve the reliability of the power battery.

[0117] In a third aspect, the present invention provides an electric vehicle comprising the power battery as described in the second aspect.

[0118] By adopting the above technical solution, in the power battery used in the electric vehicle of the present invention, the battery pack case 1 part can be overlapped by the ear assembly 4 and the reinforcing beam assembly 5 to form a load-bearing frame. The load-bearing frame is a closed frame structure that can support the battery module, so that the bottom shell 2 covered on the bottom of the load-bearing frame can no longer play the main supporting role for the battery module, which can reduce the stress on the bottom shell 2 and reduce the risk of stress integration causing the bottom shell 2 to rupture, thereby helping to reduce the risk of sealing failure of the battery pack case 1, improve the reliability of the battery pack case 1, and further improve the reliability of the power battery, which helps to improve the reliability of the electric vehicle.

[0119] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack case for an electric vehicle, comprising a bottom shell, wherein the bottom shell is used to encapsulate the battery pack case, characterized in that: include: The carrier frame is used to support the battery module in the battery pack box, including: frame; Lifting ear assemblies, respectively provided on opposite sides of the frame, fixedly connected to the frame, and used for mounting the battery pack box on the electric vehicle; A reinforcing beam assembly is fixedly connected to the frame, comprising a first beam and a second beam, wherein the first beam and the second beam are cross-arranged at the bottom of the frame, and the reinforcing beam assembly is used to support the battery module; Wherein, the bottom shell is covered on the bottom of the carrying frame.

2. The battery pack case according to claim 1, wherein: The bottom shell includes an inner bottom panel and side beams. The side beams are arranged around the circumferential edge of the inner bottom panel. The inner bottom panel and the side beams are formed in one piece.

3. The battery pack case according to claim 1, wherein: Also includes: The impact-resistant cross beam is provided at the bottom of the bottom shell and is a plate-like structure protruding relative to the bottom of the bottom shell. A cavity is formed between the anti-impact cross beam and the bottom of the bottom shell. Both ends of the anti-impact cross beam are respectively connected to the lifting ear assembly.

4. The battery pack case according to claim 2, wherein: The battery pack case and the electric vehicle are electrically connected via a connector, and the battery pack case further comprises: The connector panel assembly is disposed in the bottom shell and fixedly connected to the inner wall of the side beam, comprising: A connector panel, the back of which is welded and fixed to the inner wall of the side beam; A rivet nut, riveted to the connector panel, the rivet nut comprising a flange head, the flange head being located on the back side of the connector panel; The connector includes a conductive terminal and a bolt. The conductive terminal passes through the side beam and the connector panel from the outer wall of the side beam, and is electrically connected to the battery module in the battery pack case. The bolt passes through the outer wall of the side beam and is threadedly connected to the flange head, thereby fixing the connector to the side beam.

5. The battery pack case according to claim 4, wherein: The back surface of the connector panel faces the inner wall of the side beam and fits with the inner wall of the side beam, and a groove is provided on the back surface, and a cavity is formed between the groove and the inner wall of the side beam, and the flange head of the rivet nut penetrates from the front surface of the connector panel and is located in the cavity; preferably, the cavity formed between the groove and the side beam is filled with a sealing member, and the sealing member is one or more of sealing glue, sealing foam, and sealing rubber strip; And / or, the connector panel is provided with perforations, the perforations include a first perforation and a second perforation arranged at intervals, the bottoms of the first perforation and the second perforation are connected, the interval between the first perforation and the second perforation is a partition, the partition extends from the top to the bottom of the perforation and crosses the center connecting line of the first perforation and the second perforation; the conductive terminal passes through the first perforation and the second perforation from the outer wall of the side beam, and abuts against the inner peripheral wall of the first perforation and the inner peripheral wall of the second perforation.

6. The battery pack case according to claim 2, wherein: The side beam extends along a first direction, and the lifting eye assembly includes: The first lifting lug includes: A first ear plate is provided with a first ear hole, and the battery pack box is hoisted to the electric vehicle through the first ear hole; A support plate is provided at the bottom of the frame body to support the frame body; a vertical plate, wherein two sides thereof along the height direction are respectively connected to the first ear plate and the support plate, the vertical plate and the connection points of the first ear plate and the support plate are respectively angled, the vertical plate and the outer wall of the side beam are arranged opposite to each other along a second direction, the vertical plate is fixedly connected to the outer wall of the side beam, and the second direction is perpendicular to the first direction and the height direction; Preferably, the lifting lug assembly further comprises: a rib plate, perpendicular to the first direction, disposed between the vertical plate and the outer wall of the side beam in the second direction, the rib plate having a bottom edge, and a first side edge and a second side edge opposite to each other in the second direction, the first side edge being fixedly connected to the vertical plate, the second side edge being fixedly connected to the outer wall of the side beam, and the bottom edge being fixedly connected to the support plate; Preferably, the lifting lug assembly further comprises: a first flange, provided on the first side and the bottom edge, wherein the rib plate is fixedly attached to the support plate and the vertical plate via the first flange; The second flange is provided on the second side, and the rib is fixed to the outer wall of the side beam via the second flange.

7. The battery pack case according to claim 6, wherein: The lifting eye assembly further comprises: The second lifting lug is provided on the back side of the first lifting lug and includes: A second ear plate is located below the first ear plate and is provided with a second ear hole, wherein the second ear hole coincides with the central axis of the first ear hole in the height direction of the battery pack case; Ear bushings, arranged in the first ear hole and the second ear hole; The second lifting ear is fitted with the supporting plate and the vertical plate, and the second lifting ear is fixedly connected to the first lifting ear, so that the lifting ear bushing is fixedly clamped between the first ear plate and the second ear plate.

8. The battery pack case according to claim 6, wherein: The battery pack box further includes: a reinforcing plate, located between the second beam and the inner wall of the side beam in the second direction, wherein the second flange, the side beam and the reinforcing plate are fixed by screw connection; Preferably, the side beam is stepped and comprises: A first step, comprising a first tread and a first riser; A second step connected to the bottom of the first step, comprising a second tread and a second riser, wherein the second tread is connected to the first riser; Wherein, the reinforcing plate is fitted and fixed to the first riser, the second tread and the second riser; Preferably, the height of the second beam is flush with the height of the second step, the second beam extends along the second direction, and the end of the second beam along the second direction is provided with an end flange, and the end flange is fit and fixed to the second riser and the second tread to fix the second beam to the reinforcing plate.

9. A power battery, characterized in that: Comprising a battery pack case as described in any one of claims 1-8.

10. An electric vehicle, characterized in that: Including the power battery as claimed in claim 9.

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