Battery pack for electric vehicle and electric vehicle including the same

Abstract

The present invention discloses a battery pack for electric vehicles and an electric vehicle including the same. The battery pack for electric vehicles comprises: a box body, at least two containing boxes for containing battery modules are provided in the box body, and the two containing boxes are arranged at intervals to form a gap; a locking matching mechanism, the locking matching mechanism is arranged in the gap, and the locking point of the locking matching mechanism and the locking mechanism on the longitudinal beam of the vehicle body is lower than the upper end of the containing box. The battery pack for electric vehicles has a gap formed between the containing boxes of the box body. By arranging the locking matching mechanism in the gap, the thickness of the battery pack for electric vehicles is reduced, and more battery packs can be placed in the battery swap station. When the battery pack is installed on the vehicle, more height space is left for the battery swap equipment, which is convenient for the battery swap equipment to perform bottom battery swap, reducing the construction cost, time and difficulty of the battery swap station, reducing the requirements for the construction site, and improving the efficiency of battery swap.

Description

[0001] This application claims priority to Chinese patent applications No. 2021116067637, CN2021116067815, filed on December 26, 2021, and No. 2021114443838, filed on November 30, 2021. This application cites the full text of the above Chinese patent applications. Technical Field

[0002] The present invention relates to the technical field of vehicle battery replacement, and in particular to a battery pack for an electric vehicle and an electric vehicle comprising the same. Background Art

[0003] At present, the battery pack for electric vehicles is heavy and has a complex locking structure, resulting in a thick overall thickness of the battery pack. In a battery swap station for replacing batteries for vehicles, the number of battery packs that can be carried by a battery rack for accommodating the battery pack for electric vehicles depends on the thickness of the battery pack. Therefore, such a thick battery pack is not conducive to increasing the number of battery packs that can be stored and charged on a single charging rack, resulting in a larger volume of the charging rack and the battery swap station with it, and also resulting in a low energy storage density of the battery swap station, which is not conducive to setting up a battery swap station in areas such as cities that require a high floor space.

[0004] In addition, currently, the battery pack needs to be transported to the bottom of the electric vehicle by the battery swap equipment, and the battery pack needs to be lifted by the battery swap equipment to be installed at the bottom of the electric vehicle. In the case of thick battery packs, in order to allow the battery swap equipment and battery pack to enter the bottom of the car, a sunken space must be set up in the battery swap station or a pit must be dug for the battery swap equipment to shuttle, or a lifting device must be used to lift the electric vehicle, which will result in high cost, long time and high difficulty in building the battery swap station. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the battery pack is relatively thick, resulting in a large area occupied by the battery swap station, insufficient space in the height direction for the battery swap equipment under the electric vehicle, which requires the setting up of a sunken space, digging a pit, or lifting the electric vehicle, and thus the high cost, time and difficulty of building the battery swap station. A battery pack for an electric vehicle and an electric vehicle comprising the same are provided.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A battery pack for an electric vehicle, which is installed on a longitudinal beam of a vehicle body of the electric vehicle, is characterized in that the battery pack for the electric vehicle comprises:

[0008] A box body, wherein the box body has at least two containing boxes for containing battery modules, and the two containing boxes are spaced apart to form a gap;

[0009] A locking matching mechanism is provided in the gap, and a locking point between the locking matching mechanism and the locking mechanism on the vehicle body longitudinal beam is lower than the upper end of the accommodation box.

[0010] The battery pack for electric vehicles has a gap formed between each containing box of the box body by spacing. A locking matching mechanism is set in the gap, and the locking matching mechanism is used to cooperate with the locking mechanism to realize the installation of the battery pack for electric vehicles on the longitudinal beam of the vehicle body. At the same time, the thickness of the entire battery pack for electric vehicles can be reduced, so that the battery exchange station accommodating the battery pack for electric vehicles can accommodate more battery packs, thereby improving economic efficiency. When the battery pack for electric vehicles is installed on the electric vehicle, more space in the height direction is left for the battery exchange equipment, so that the height space under the longitudinal beam of the vehicle body can be fully utilized, so that the battery exchange equipment can exchange power from the bottom of the electric vehicle without setting up a sunken space or digging a pit for the battery exchange equipment to enter and exit, or lifting the electric vehicle to create enough height space for the battery exchange equipment, thereby reducing the construction cost, time and difficulty of the battery exchange station, reducing the requirements for the construction site, and improving the efficiency of battery exchange.

[0011] Preferably, the locking engagement mechanism comprises a horizontally arranged locking shaft, and the locking shaft extends along the width direction of the battery pack.

[0012] In the above technical solution, the locking shaft structure is simple and easy to process and can be firmly locked with the locking mechanism.

[0013] Preferably, each of the containing boxes comprises:

[0014] A box body, wherein a battery cell receiving slot is provided in the box body, and the battery module is arranged in the battery cell receiving slot;

[0015] The box cover is detachably connected to the notch of the battery cell accommodating slot of the box body and closes the notch.

[0016] The above structural arrangement facilitates the disassembly, assembly and maintenance of the battery module relative to the containing box by opening the box cover relative to the box body.

[0017] Preferably, the containing box further comprises a sealing member, wherein the sealing member is disposed around a notch of the battery cell containing groove and is sandwiched between the box body and the box cover.

[0018] The above-mentioned structural arrangement improves the sealing effect inside the container box and prevents external environmental factors from affecting the normal operation of the battery module inside the container box, for example, water flowing into the battery cell receiving groove causes a short circuit of the battery module.

[0019] Preferably, one end or both ends of the lock shaft are respectively connected to the adjacent box body or box cover.

[0020] The above-mentioned structural arrangement connects the end of the lock shaft through the box body or the box cover of the receiving box, so that the connection between the lock shaft and the receiving boxes on both sides is more secure, the structural strength of the lock shaft is improved, and at the same time, the force applied to the lock shaft can be simultaneously transmitted to the receiving boxes on both sides, so that the force on the entire electric vehicle battery pack is more evenly distributed.

[0021] Preferably, there are multiple locking shafts, and the multiple locking shafts are arranged along the length direction of the vehicle body longitudinal beam.

[0022] The above structural arrangement improves the stability and reliability of the battery pack connected to the longitudinal beam of the vehicle body through the lock shaft by increasing the connection points between the lock shaft and the locking mechanism.

[0023] Preferably, a fixing block is provided in the gap, both ends of the lock shaft are connected to the fixing block, and the fixing block is connected to the adjacent box body or box cover.

[0024] The above-mentioned structural arrangement improves the connection reliability of the lock shaft relative to the box body or the box cover. Due to weight reduction considerations, the plate thickness of the box body and the box cover cannot be too thick. The lock shaft and the box body or the box cover are transferred through a fixed block. When the plate thickness of the box body and the box cover cannot be too thick, it is equivalent to increasing the contact area between the lock shaft and the box body or the box cover through the fixed block, so as to achieve a more reliable connection.

[0025] Preferably, adjacent containing boxes are connected by a gap connection structure to form the gap;

[0026] The gap junction structure comprises:

[0027] The fixing block is connected to the box body of the adjacent containing box through the cover plate.

[0028] In the above-mentioned structural arrangement, a cover plate is arranged in the gap to realize the connection between the box bodies of adjacent containing boxes, thereby improving the connection strength between the adjacent containing boxes and making the box body as a whole more stable.

[0029] Preferably, a locking hole is provided at a position of the cover plate corresponding to the locking mechanism, and the locking shaft is located below the locking hole.

[0030] When the battery pack for an electric vehicle is connected to the longitudinal beam of the vehicle body, the locking hole can limit the locking mechanism in the horizontal direction, thereby improving the positioning ability of the battery pack for an electric vehicle relative to the longitudinal beam of the vehicle body and avoiding shaking when the battery pack for an electric vehicle is locked on the electric vehicle. At the same time, the positioning block fixes the two ends of the lock shaft, thereby making the lock shaft connection structure more stable.

[0031] Preferably, the gap connection structure also includes a pair of C-shaped connecting plates, which extend along the length direction of the vehicle body longitudinal beam, and the opening directions of the pair of C-shaped connecting plates are arranged in opposite directions, and the fixing block is clamped in the C-shaped connecting plate on the corresponding side.

[0032] The above structural arrangement realizes the positioning of a pair of fixed blocks by wrapping the C-shaped connecting plate up and down, thereby preventing the positioning block from tipping over due to the large pulling force of the locking shaft, making the connection more reliable and the force at the gap connection structure more uniform.

[0033] Preferably, the gap connection structure further includes a first support plate, which is disposed between a pair of the C-shaped support connection plates, and the first support plate is respectively connected to the pair of the C-shaped connection plates at both ends along the width direction of the vehicle body longitudinal beam.

[0034] With the above structure, when the fixed block is subjected to excessive pulling force from the locking shaft and tends to tip over, the pair of C-shaped connecting plates will also tend to tip over towards each other. At this time, the C-shaped connecting plates on both sides are connected by the first support plate to prevent the pair of C-shaped connecting plates from tipping over.

[0035] Preferably, the gap connection structure further includes a second support plate, which is disposed below the C-shaped connection plate and is respectively connected to the first support plate and the cover plate.

[0036] The above-mentioned structural arrangement additionally arranges a second support plate below the C-shaped connecting plate, and respectively connects the first support plate and the cover plate, so as to further strengthen the structural strength of the gap connection structure, so as to facilitate the uniform distribution of the force on the locking shaft when it remains locked in the locking mechanism, and avoid the occurrence of stress concentration points on the gap connection structure.

[0037] Preferably, the battery pack for electric vehicles further comprises a push rod mechanism for unlocking the locking mechanism, wherein the push rod mechanism is arranged in the gap, and the push rod mechanism comprises a push rod, which is arranged vertically and can move in a vertical direction.

[0038] The above structure is set up, when the push rod mechanism is driven to push up in the vertical direction, it contacts the lock link of the locking mechanism located on the longitudinal beam of the electric vehicle body to achieve the purpose of unlocking. By setting the push rod mechanism in the gap, it is avoided that the setting of the push rod occupies the space of the storage box, thereby affecting the number of battery modules set, resulting in a decrease in battery capacity.

[0039] Preferably, the battery pack for electric vehicles further comprises a connecting bottom plate, the connecting bottom plate is arranged in the gap, and two ends of the connecting bottom plate are respectively connected to the two box bodies;

[0040] The push rod mechanism also includes a guide seat arranged on the connecting bottom plate, the guide seat is provided with a guide hole, and the push rod is inserted into the guide hole.

[0041] With the above-mentioned structural arrangement, the guide hole achieves the purpose of guiding the push rod, so that the push rod can keep moving in the vertical direction.

[0042] Preferably, the push rod mechanism also includes a first elastic member, a limiting portion is provided on the push rod, two ends of the first elastic member are respectively connected to the guide seat and the limiting portion, and the first elastic member is used to apply a force to the limiting portion to move the push rod downward.

[0043] The above structural arrangement realizes automatic resetting of the ejector rod by providing the first elastic member, and the structure is simple and reliable.

[0044] Preferably, the first elastic member is sleeved on the top rod.

[0045] The above structure is arranged so that the first elastic member is positioned in the horizontal direction through the push rod.

[0046] Preferably, the push rod mechanism further includes:

[0047] A jacking seat, wherein the jacking seat is movably arranged on the connecting bottom plate and a transition groove is provided at one end of the jacking seat close to the ejector rod, wherein the groove depth direction of the transition groove is the vertical direction, and one end of the ejector rod close to the connecting bottom plate extends into the transition groove and can move in the transition groove along the groove depth direction of the transition groove;

[0048] A second elastic member, wherein the lifting seat and the lifting rod are elastically connected through the second elastic member.

[0049] The above-mentioned structural arrangement, by providing a lifting seat and a second elastic member, when the battery swapping device applies a force toward the lift rod to the lifting seat, the lift rod first moves toward the locking mechanism together with the lifting seat until the lift rod presses against the lock link of the locking mechanism. Then, under the action of the force continued to be applied by the battery swapping device, the lift rod gradually penetrates into the transition groove and the second elastic member is gradually compressed, thereby playing a buffering role for the lift rod, which can avoid hard contact between the lifting mechanism and the locking mechanism, causing damage to the lifting mechanism.

[0050] Preferably, a first step is provided on the push rod, the second elastic member is sleeved on the push rod and the first end of the second elastic member is abutted against the first step, and the second end of the second elastic member is abutted against the lifting seat.

[0051] The above structural arrangement realizes the elastic connection of the ejector rod relative to the ejection seat.

[0052] Preferably, a first limiting hole is formed on the guide seat, the first limiting hole is coaxially arranged with the guide hole, a second step is formed on the push rod, and the push rod is inserted into the first limiting hole;

[0053] When the push rod mechanism is in an initial state, the second step of the push rod abuts against the first limiting hole.

[0054] The above structural arrangement achieves the purpose of limiting the position of the ejector rod in the lifting direction.

[0055] Preferably, a second limiting hole is formed on the guide seat, a third step is formed on the lifting seat, and the lifting seat is inserted into the second limiting hole;

[0056] When the ejector mechanism is in an initial state, the third step of the ejector seat abuts against the second limiting hole.

[0057] The above structural arrangement achieves the purpose of limiting the position of the jacking seat in the lifting direction.

[0058] Preferably, a portion of the jacking seat below the third step is provided with a limiting member;

[0059] When the push rod mechanism is in the limit state, the limiting member abuts against the guide seat.

[0060] The above structural arrangement can limit the maximum upward movement of the jacking seat, thereby preventing the jacking rod mechanism from being excessively displaced and damaging the locking mechanism.

[0061] Preferably, at least one pair of positioning holes is provided on the connecting base plate, and the positioning holes are used to cooperate with the positioning pins on the battery exchange device.

[0062] The above-mentioned structural setting makes full use of the space of the gap to set the positioning structure, so as to avoid the positioning holes and the top rods occupying the space of the receiving box, thereby affecting the number of battery modules set and causing a decrease in battery capacity.

[0063] Preferably, the cross-sectional shape of the positioning holes is rectangular, and the length directions of the two positioning holes are different.

[0064] The above structure sets up two rectangular holes with different directions on both sides of the top rod, thereby improving the positioning accuracy.

[0065] Preferably, the positioning holes are distributed on both sides of the push rod along the length direction of the vehicle body longitudinal beam.

[0066] The above-mentioned structural arrangement fully utilizes the gap space between adjacent containing boxes, so that when unlocking, the unlocking mechanism of the battery swapping equipment can lift the push rod more accurately.

[0067] Preferably, weight-reducing holes are provided on the connecting bottom plate.

[0068] The above structural arrangement reduces the weight of the battery pack for electric vehicles and reduces the manufacturing cost.

[0069] Preferably, the battery pack for an electric vehicle further comprises a second electrical connector for docking with the first electrical connector on the longitudinal beam of the vehicle body, the second electrical connector being arranged at a position of the box body corresponding to the first electrical connector, and the second electrical connector being electrically connected to the battery module.

[0070] The above structure sets up the cables of multiple battery modules on the second electrical connector to achieve docking with the first electrical connector on the longitudinal beam of the vehicle body. The above structure sets up can reduce the number of electrical connection docking of the battery pack with respect to the longitudinal beam of the vehicle body and improve the docking reliability.

[0071] Preferably, the box also includes:

[0072] A cable duct is provided in the gap, and the battery cell receiving slots of adjacent receiving boxes are connected through the cable duct.

[0073] The above-mentioned structural arrangement enables the cables of the battery modules in different containing boxes to be gathered in the same containing box through the cable duct, so as to facilitate the cable wiring and avoid the cables being exposed.

[0074] Preferably, the number of the accommodating boxes is three, the three accommodating boxes are spaced apart to form two gaps, and the locking and matching mechanisms are respectively arranged in the two gaps.

[0075] The above structural arrangement enables the locking matching mechanisms to be arranged at different positions of the box body so as to lock with the locking mechanisms of the vehicle body longitudinal beams from different directions, thereby improving the locking effect.

[0076] An electric vehicle comprises a vehicle body longitudinal beam and a battery pack for the electric vehicle as described above, wherein the vehicle body longitudinal beam is provided with a locking mechanism, and the battery pack for the electric vehicle is detachably connected to the vehicle body longitudinal beam by cooperating with the locking mechanism through the locking matching mechanism.

[0077] The electric vehicle has a gap formed between each containing box of the box body by an interval arrangement. A locking matching mechanism is arranged in the gap, and the locking matching mechanism is used to cooperate with the locking mechanism to realize the installation of the battery pack for the electric vehicle on the longitudinal beam of the vehicle body. At the same time, the thickness of the entire battery pack for the electric vehicle can be reduced, so that the battery swap station accommodating the battery pack for the electric vehicle can accommodate a larger number of battery packs, thereby improving economic efficiency. When the battery pack for the electric vehicle is installed on the electric vehicle, more space in the height direction is left for the battery swap equipment, so that the height space under the longitudinal beam of the vehicle body can be fully utilized, so that the battery swap equipment can be replaced from the bottom of the electric vehicle, without setting up a sunken space or digging a pit for the battery swap equipment to enter and exit, or lifting the electric vehicle to create enough height space for the battery swap equipment, thereby reducing the construction cost, time and difficulty of the battery swap station, reducing the requirements for the construction site, and improving the efficiency of battery swap.

[0078] Preferably, the electric vehicle further comprises a body bracket, wherein the body bracket is arranged on the body longitudinal beam, and the locking mechanism is arranged on the body bracket.

[0079] With the above structural arrangement, the battery pack is connected to the body bracket on the body longitudinal beam of the electric vehicle, which increases the connection reliability and reduces the changes to the body longitudinal beam.

[0080] Preferably, the locking matching mechanism includes a horizontally arranged locking shaft, and the locking shaft extends along the width direction of the vehicle body longitudinal beam, and the locking mechanism includes a through slot for the locking shaft to pass through.

[0081] In the above structure, the lock shaft is arranged in the through slot to achieve locking, so that the end of the lock shaft can completely pass through the slot, thereby reducing the occurrence of the lock shaft falling out of the locking mechanism and improving the connection stability of the lock shaft relative to the locking mechanism. Furthermore, if the lock shaft is a structure with fixed ends, the problem of the lock shaft falling out of the locking mechanism can be completely avoided.

[0082] Preferably, the top of the battery pack for the electric vehicle is located below the vehicle body bracket or the vehicle body longitudinal beam.

[0083] With the above structural arrangement, the battery pack for the electric vehicle does not occupy the upper space of the longitudinal beam of the vehicle body, thereby leaving more space for carrying people and goods for the electric vehicle.

[0084] The positive and progressive effects of the present invention are:

[0085] The battery pack for electric vehicles and the electric vehicle containing the same, the housing boxes of the battery pack for electric vehicles form gaps by spacing, and a locking matching mechanism is set in the gap, and the locking matching mechanism is used to cooperate with the locking mechanism to realize the installation of the battery pack for electric vehicles on the longitudinal beam of the vehicle body, and at the same time, the thickness of the entire battery pack for electric vehicles can be reduced, so that the battery exchange station containing the battery pack for electric vehicles can accommodate more battery packs, thereby improving economic efficiency. When the battery pack for electric vehicles is installed on the electric vehicle, more space in the height direction is left for the battery exchange equipment, so that the height space under the longitudinal beam of the vehicle body can be fully utilized, so that the battery exchange equipment can exchange power from the bottom of the electric vehicle, without setting up a sunken space or digging a pit for the battery exchange equipment to enter and exit, or lifting the electric vehicle to create enough height space for the battery exchange equipment, thereby reducing the construction cost, time and difficulty of the battery exchange station, reducing the requirements for the construction site, and improving the efficiency of battery exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 The figure is a schematic diagram of the chassis structure of an electric vehicle according to an embodiment of the present invention.

[0087] Figure 2 Schematic diagram of the connection relationship between a battery pack and a vehicle body bracket according to an embodiment of the present invention.

[0088] Figure 3 The figure is a schematic structural diagram of a vehicle body bracket according to an embodiment of the present invention.

[0089] Figure 4 FIG. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention.

[0090] Figure 5 FIG. 1 is a schematic diagram of a partial structure of a battery pack according to an embodiment of the present invention.

[0091] Figure 6 FIG1 is a schematic cross-sectional structural diagram of a battery pack according to an embodiment of the present invention (I).

[0092] Figure 7 for Figure 6 A partial enlarged view of part C.

[0093] Figure 8 for Figure 6 A partial enlarged view of part D.

[0094] Fig. 9 The figure is a schematic structural diagram of a fixing block according to an embodiment of the present invention.

[0095] Fig.10 The figure is a schematic structural diagram of a cover plate according to an embodiment of the present invention.

[0096] Fig.11Schematic diagram of the structure of a C-shaped connecting plate according to an embodiment of the present invention.

[0097] Fig.12 FIG. 1 is a partial cross-sectional view of a gap connection structure according to an embodiment of the present invention. FIG.

[0098] Fig.13 FIG. 4 is a schematic structural diagram of a first supporting plate according to an embodiment of the present invention.

[0099] Fig.14 FIG. 4 is a schematic structural diagram of a second supporting plate according to an embodiment of the present invention.

[0100] Fig.15 FIG. 4 is a cross-sectional view of a gap connection structure according to an embodiment of the present invention.

[0101] Fig.16 for Fig.15 A partial enlarged view of part E in the middle.

[0102] Fig.17 for Fig.15 A partial enlarged view of part F.

[0103] Fig.18 FIG. 2 is a partial cross-sectional view of a gap connection structure according to an embodiment of the present invention. FIG.

[0104] Fig.19 FIG. 1 is a bottom view of a battery pack according to an embodiment of the present invention.

[0105] Fig. 20 It is a schematic structural diagram of a battery pack according to an embodiment of the present invention, wherein the box cover is hidden.

[0106] Description of reference numerals:

[0107] Electric Vehicle 100

[0108] Battery Pack 10

[0109] Box 1

[0110] Storage box 11

[0111] Box body 111, battery cell receiving slot 1111, notch 1112

[0112] Box cover 112

[0113] Seal 113

[0114] Cable duct 114

[0115] Side wall reinforcement structure 115

[0116] Bottom reinforcement structure 116, welding nut 116a

[0117] Gap junction structure 2

[0118] Cover plate 21, locking hole 211

[0119] C-type connecting plate 22

[0120] First support plate 23, plug portion 23a, upper surface 23b of first support plate, lower surface 23c of first support plate

[0121] Second support plate 24, rectangular hole 24a

[0122] Locking mechanism 3

[0123] Lock shaft 31

[0124] Fixed block 32

[0125] Ejector mechanism 4

[0126] Push rod 41, limiting portion 411, first step 412, second step 413

[0127] Guide seat 42, first limiting hole 422, second limiting hole 423

[0128] The first elastic member 43

[0129] Lifting seat 44, transition groove 441, third step 442, limiting member 443

[0130] The second elastic member 45

[0131] Connecting base plate 5

[0132] Positioning hole 51

[0133] Weight reduction hole 52

[0134] Second electrical connector 6

[0135] Body longitudinal beam 20

[0136] Body bracket 30

[0137] Locking mechanism 40

[0138] The first electrical connector 50 DETAILED DESCRIPTION

[0139] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0140] The present invention provides an electric vehicle 100, the structure of the chassis of which is as follows Figure 1As shown, the electric vehicle 100 has two body longitudinal beams 20 arranged in parallel along the front-to-rear direction, which are used to connect the main components of the electric vehicle 100, such as suspension, wheels, etc. The battery pack for the electric vehicle is also installed under the two body longitudinal beams 20. In this embodiment, the electric vehicle 100 is a heavy-duty vehicle or a light-duty vehicle. Of course, it can also be applied to passenger vehicles such as sedans.

[0141] like Figure 2 and Figure 3 As shown, in this embodiment, a body bracket 30 is simultaneously connected to two body longitudinal beams 20 of the electric vehicle 100. The body bracket 30 is a frame structure formed by welding profiles. Each locking mechanism 40 is arranged at the lower surface of the longitudinal beam of the body bracket 30, and is used to lock and connect with the locking matching mechanism 3 on the battery pack 10, so that the battery pack 10 is connected or disconnected relative to the body bracket 30, so as to achieve the purpose of replacing the battery. Among them, the locking mechanisms 40 are arranged in two rows at the lower surface of the body bracket 30 to correspond to the two body longitudinal beams 20 respectively, and these locking mechanisms 40 are arranged in sequence along the length direction A of the body longitudinal beam, so as to improve the connection reliability and stability of the battery pack 10 relative to the body bracket 30 and the body longitudinal beam 20 through multi-point connection.

[0142] At the same time, a first electrical connector 50 is also provided at the end position of the body bracket 30 for docking with the second electrical connector 6 on the side of the battery pack 10, so as to achieve electrical connection relative to the battery pack 10 when the battery pack 10 is installed on the body bracket 30, thereby meeting the demand for power supply to the electric vehicle 100.

[0143] Among them, Figure 2 As shown, the battery pack 10 is arranged below the vehicle body bracket 30, so that the battery replacement equipment (not shown in the figure) can connect to the battery pack 10 from below and lock or unlock the battery pack 10 relative to the locking mechanism 40 of the vehicle body bracket 30, thereby realizing the removal, placement and transportation of the battery pack 10.

[0144] The specific structure of the battery pack 10 is as follows Figure 4 As shown, it includes a box body 1, a locking matching mechanism 3 and a second electrical connector 6. Among them, the second electrical connector 6 is arranged at the middle position of the side of the box body 1 to correspond to the first electrical connector 50 of the vehicle body bracket 30. The box body 1 is composed of three receiving boxes 11 for accommodating battery modules. The three receiving boxes 11 are arranged in sequence along the width direction B of the vehicle body longitudinal beam to form a gap between two adjacent receiving boxes 11 brackets, and the locking matching mechanism 3 is distributed in the two gaps and is arranged corresponding to the position of each locking mechanism 40 of the vehicle body bracket 30.

[0145] The battery pack for electric vehicles has a gap formed between each containing box 11 of the box body 1 by means of interval arrangement. By setting a locking matching mechanism 3 in the gap, the thickness of the entire battery pack for electric vehicles can be reduced, so that the battery swap station accommodating the battery pack for electric vehicles can accommodate a larger number of battery packs 10, thereby improving economic efficiency. When the battery pack for electric vehicles is installed on the electric vehicle 100, more space in the height direction is left for the battery swap equipment, so that the height space under the longitudinal beam 20 of the vehicle body can be fully utilized, so that the battery swap equipment can swap the battery from the bottom of the electric vehicle, without setting up a sunken space or digging a pit for the battery swap equipment to enter and exit, or lifting the electric vehicle to create enough height space for the battery swap equipment, thereby reducing the cost, time and difficulty of building a battery swap station, reducing the requirements for the site of the station, and improving the efficiency of battery swap.

[0146] like Figure 5 As shown, the locking mechanism 3 includes a horizontally arranged locking shaft 31, and the two ends of the locking shaft 31 are fixedly connected to the receiving box 11 on the adjacent sides, and the locking shaft 31 extends along the width direction of the battery pack 10 (the width direction B of the longitudinal beam of the vehicle body), and the position of the locking shaft 31 is lower than the upper end of the receiving box 11. The locking mechanism 40 located on the vehicle body bracket 30 has a horizontal through slot corresponding to the locking shaft 31, and the through slot is used for the locking shaft 31 to pass through, so as to achieve the locking of the locking shaft 31 relative to the locking mechanism 40, wherein the locking is achieved by accommodating the locking shaft 31 through the through slot, so that both ends of the locking shaft 31 can be fixed, so as to avoid the situation that the locking shaft 31 is a cantilever structure, thereby improving the connection stability of the locking shaft 31 relative to the locking mechanism 40.

[0147] like Figure 6 and Figure 7 As shown, for the box body 1 of the battery pack 10, each containing box 11 includes a box body 111 and a box cover 112. Among them, a battery cell containing groove 1111 is provided in the box body 111, and a battery module is provided in the battery containing groove 111. The size of the battery module can be smaller than the battery cell containing groove 1111, so that a single containing box 11 can simultaneously contain multiple battery modules. The box cover 112 is connected to the notch 1112 of the battery cell containing groove 1111 of the box body 111 by bolt connection, and covers and closes the entire notch 1112. Through this structural scheme, the box cover 112 is set to be open relative to the box body 111, so as to facilitate the disassembly and maintenance of the battery module relative to the containing box 11. At the same time, the box cover 112 is closed relative to the box body 111 to protect the internal battery module and avoid the influence of external environmental factors.

[0148] At the same time, in order to improve the sealing effect, the receiving box 11 further includes a sealing member 113, which is arranged around the notch 1112 of the battery cell receiving groove 1111 and is sandwiched between the notch 1112 of the box body 111 and the box cover 112 (see Figure 7 In this embodiment, the sealing member 113 is a foamed silicone pad to achieve reliable sealing. Of course, in other embodiments, other sealing materials can also be used to achieve sealing.

[0149] Among them, the number of the locking shafts 31 in this embodiment is multiple, and these locking shafts 31 are arranged A along the length direction of the vehicle body longitudinal beam 20, and the two ends of the locking shaft 31 are respectively connected to the box body on the adjacent side, so that the height of the locking shaft 31 is lower than the upper end of the box. In other specific embodiments, the two ends of the locking shaft 31 can also be fixedly connected to the box cover on the adjacent side; the locking shaft 31 can also have only one end as a fixed end and connected to one side of the box body or the box cover, and the other end is a free end, which can also realize the locking function with the locking mechanism, which will not be repeated here.

[0150] In addition, if Figure 7 As shown, two sets of upper and lower side wall reinforcement structures 115 are welded on the peripheral surface of the box body 111. The side wall reinforcement structure 115 is made of a plate material and is fixed to the peripheral surface of the box body 111 by welding to strengthen the peripheral strength of the box body 111 and better protect the box body 111. At the same time, a bottom reinforcement structure 116 is also welded on the bottom surface of the box body 111 to carry the battery module and to strengthen the bottom strength of the box body 111 to prevent the bottom surface of the box body 111 from being concave under a large load-bearing condition. The surface of the bottom reinforcement structure 116 is arranged with weight-reducing holes to achieve the purpose of weight reduction and lightweight. A welding nut 116a is also welded on the upper surface of the bottom reinforcement structure 116 for threaded connection and fixation of the battery module.

[0151] like Figure 8 As shown, in this embodiment, at the gap between the two receiving boxes 11, in order to make the lock shaft 31 more firmly connected in the gap, the two ends of the lock shaft 31 are respectively connected to the fixing block 32, and the end of the lock shaft 31 is fixed in the fixing block 32 by installing a set screw on the top of the fixing block 32. The structure of the fixing block 32 is as shown in FIG. Fig. 9As shown, the box bodies 111 of the receiving boxes 11 on both sides are connected to the lock shaft 31 through the fixing blocks 32. This connection scheme can improve the connection reliability of the lock shaft 31 relative to the box body 111. Due to the consideration of weight reduction, the thickness of the plate of the box body 111 cannot be too thick. The lock shaft 31 is connected to the box body 111 and the box cover 112 through the fixing blocks 32. When the plate of the box body 111 cannot be too thick, the contact area of ​​the lock shaft 31 is increased through the fixing blocks 32 to achieve a more reliable connection. Of course, in other embodiments, the lock shaft 31 can also be fixed to the box cover 112 through the fixing blocks 32.

[0152] At the same time, between the two receiving boxes 11, the gap connection structure 2 is used to realize the reliable connection between the two receiving boxes 11 and to fix the lock shaft 31. The adjacent receiving boxes are connected by the gap connection structure to form the aforementioned gap. The gap connection structure 2 includes a cover plate 21. The structure of the cover plate 21 is as follows: Fig.10 As shown, the fixing block 32 is connected to the box body 111 of the adjacent storage box 11 through the cover plate 21. The cover plate 21 is arranged in the gap to realize the connection between the box bodies 111 of the adjacent storage boxes 11, improve the connection between the adjacent storage boxes 11, and make the box body 1 more stable as a whole. In addition, the cover plate 21 covers the top of the lock shaft 31, and a rectangular locking hole 211 is provided on the cover plate 21, and the locking hole 211 is formed above the cover plate 21 corresponding to the lock shaft 31, so that the locking mechanism 40 can extend into it. The cover plate 21 is fixed to the reinforcing structure of the side surfaces of the box body 111 on both sides by adhering and welding the end portions 21a located on both sides, thereby realizing a reliable connection among the locking shaft 31, the fixing block 32, the cover plate 21 and the box body 111, so as to connect the end of the locking shaft 31 through the box body 111 or the box cover plate 112 of the accommodating box 11, thereby improving the structural strength of the locking shaft 31 and enabling the locking shaft 31 to better connect the battery pack 10 to the vehicle body longitudinal beam 20.

[0153] With this structural arrangement, when the battery pack for an electric vehicle is connected to the body bracket 30 on the body longitudinal beam 20, the locking hole 211 can limit the locking mechanism 40, thereby improving the positioning capability of the battery pack for an electric vehicle relative to the body longitudinal beam 20 of the vehicle, and avoiding shaking when the battery pack for an electric vehicle is locked on the electric vehicle 100. At the same time, the positioning block fixes the two ends of the locking shaft 31, thereby making the connection structure of the locking shaft 31 more stable.

[0154] like Figure 8 As shown, further, in order to prevent the fixing block from tipping over due to excessive force, a pair of C-shaped connecting plates 22 are also provided in the gap connection structure 2. The structure of the C-shaped connecting plate 22 is as shown in FIG. Fig.11As shown. The two C-shaped connecting plates 22 extend along the length direction A of the longitudinal beam of the vehicle body, and the openings 22a of the two C-shaped connecting plates 22 are arranged in opposite directions. The fixing block 32 is clamped in the C-shaped connecting plate 22 on the corresponding side, and the end of the lock shaft 31 protrudes from the opening 22a of the C-shaped connecting plate 22 after passing through the fixing block 32. This solution of connecting the relative fixing blocks 32 by wrapping the C-shaped connecting plate 22 up and down makes the connection between the fixing blocks 32 more reliable and the force transmission of each lock shaft 31 more uniform.

[0155] like Fig.12 As shown, in the partial cross-sectional view of the battery pack 10 along the extension direction of the gap (i.e., the length direction A of the vehicle body longitudinal beam), it can be seen that the gap connection structure 2 also includes a first support plate 23 and a second support plate 24. The aforementioned two support plates are respectively used to strengthen the structural strength of the cover plate 21 and the C-shaped connecting plate 22 in the gap connection structure 2, so that the connection between the locking shaft 31 and the box body 111 of the accommodating box 11 is more stable and reliable.

[0156] The first support plate 23 is disposed between two C-shaped support connecting plates arranged in pairs. The structure of the first support plate 23 is as follows: Fig.13 As shown, at both ends of the first support plate 23 along the width direction B of the vehicle body longitudinal beam, a plug-in portion 23a is provided, which is used for plugging and positioning relative to the two C-type connecting plates 22, and realizing reliable connection by welding, so that the two C-type connecting plates 22 can be directly connected through the first support plate 23. In this embodiment, a plurality of first support plates 23 are provided in the extension direction of the C-type connecting plate 22 (i.e., the length direction A of the vehicle body longitudinal beam), so that the two C-type connecting plates 22 are better integrated, and the C-type connecting plates 22 will not overturn due to excessive force on the fixing block. In addition, the upper surface 23b of the first support plate can be fitted and welded to the cover plate 21, and the lower surface 23c of the first support plate can be fixed in the nut on the top of the second support plate 24 by screw fixing.

[0157] The structure of the second support plate 24 is as follows Fig.14 As shown, a rectangular hole 24a is provided on the top of the second support plate 24 for accommodating and welding a square nut to achieve connection with the first support plate 23. Fig.12 As shown, the second support plate 24 is arranged below the C-shaped connecting plate 22 and is respectively connected to the first support plate 23 and the inner surface 21b of the cover plate 21 by welding. With this structural arrangement, the second support plate 24 connects the first support plate 23 and the cover plate 21 below the C-shaped connecting plate 22, further strengthening the structural strength of the gap connection structure, facilitating the uniform distribution of the force on the lock shaft 31 when it is locked in the locking mechanism 40, and avoiding the occurrence of stress concentration points on the gap connection structure 2.

[0158] like Figure 15-18 As shown, in the cross-sectional view of the battery pack 10 along the extension direction of the gap (i.e., the length direction A of the longitudinal beam of the vehicle body), it can be seen that the battery pack 10 also includes a push rod mechanism 4 for unlocking the locking mechanism 40 on the vehicle body bracket 30. The push rod mechanism 4 is arranged in the gap of the battery pack 10 along the vertical direction. The push rod mechanism 4 includes a push rod 41 extending in the vertical direction, and the push rod 41 can move in the vertical direction. The specific unlocking scheme is to push the push rod 41 upward through the unlocking mechanism on the battery exchange device carrying the battery pack 10, drive the push rod 41 to move upward, and when the push rod mechanism 4 is driven to push upward in the vertical direction, it contacts the lock link of the locking mechanism on the vehicle body bracket 30 of the electric vehicle 100, and drives the locking mechanism 40 to unlock, so as to achieve the unlocking purpose. In this embodiment, the push rod mechanism 4 is arranged in the gap to avoid the setting of the push rod 41 occupying the space of the storage box 11, thereby affecting the number of battery modules, resulting in a decrease in battery capacity.

[0159] Specifically, Fig.16 As shown, the battery pack for electric vehicles also includes a connecting bottom plate 5, which is arranged in the gap, and the two ends of the connecting bottom plate 5 are respectively connected to the two box bodies 111. The push rod mechanism 4 also includes a guide seat 42 welded on the upper surface of the connecting bottom plate 5, and a guide hole is provided on the guide seat 42. The push rod 41 passes through the guide hole, and the guide hole is used to achieve the purpose of limiting the push rod 41. This structural setting can achieve the purpose of guiding the push rod 41, so that the push rod 41 can keep moving in the vertical direction.

[0160] like Fig.17 As shown, the push rod mechanism 4 also includes a first elastic member 43, and a limiting portion 411 is provided on the push rod 41. The two ends of the first elastic member 43 are respectively connected to the top end 42a of the guide seat 42 and the limiting portion 411 of the push rod 41. The first elastic member 43 is used to apply a force to the limiting portion 411 to make the push rod 41 move downward. The automatic reset of the push rod 41 is achieved by setting the first elastic member 43. In this embodiment, the limiting portion 411 on the push rod 41 is a pin shaft passing through the side of the push rod 41, and the first elastic member 43 is a spring and is sleeved on the push rod. By setting the pin shaft, a protruding structure is formed on the side of the push rod 41, so that the protruding structure passes through the gap between the two coils of the spring to achieve the positioning of the first elastic member 43.

[0161] In addition, in order to prevent the lifting mechanism from being over-lifted and causing damage to the lifting mechanism or the locking mechanism, the lifting rod mechanism 4 also includes a lifting seat 44, which is movably arranged on the connecting base plate 5, and a transition groove 441 is opened at one end of the lifting seat 44 close to the lifting rod 41, and the groove depth direction of the transition groove 441 is in the vertical direction and the opening direction is toward the lifting rod 41. The lifting rod 41 extends into the transition groove 441 at the lower end 41a close to the connecting base plate 5, and can move up and down in the transition groove 441 along the groove depth direction of the transition groove 441.

[0162] The lifting seat 44 and the push rod 41 are elastically connected by a second elastic member 45. The second elastic member 45 is arranged relative to the lifting seat 44 and the push rod 41. Fig.16 As shown, the second elastic member 45 is a coil spring, which is sleeved on the outer surface of the lower end 41a of the push rod 41. By providing the push-up seat 44 and the second elastic member 45, a buffering effect can be achieved. In other embodiments, the second elastic member 45 can also be arranged inside the transition groove 441, which can also achieve the purpose of elastically connecting the push-up seat 44 and the push rod 41.

[0163] The push rod 41 is provided with a first step 412 , the second elastic member 45 is sleeved on the push rod 41 , and the upper end of the second elastic member 45 abuts against the first step 412 , and the lower end of the second elastic member 45 abuts against the top of the lifting seat 44 .

[0164] like Fig.17 As shown, the guide hole of the guide seat 42 includes a first limiting hole 422 located at the top end 42a, and the first limiting hole 422 is coaxially arranged with the guide hole located at the lower side of the guide seat 42. A second step 413 matching the size of the first limiting hole 422 is provided on the push rod 41. When the push rod 41 passes through the first limiting hole 422, when the push rod mechanism 4 is in the initial state, the second step 413 of the push rod 41 can abut against the first limiting hole 422, so as to achieve the purpose of limiting the downward movement of the push rod 41 in the lifting direction through the guide seat 42.

[0165] In addition, the guide hole of the guide seat 42 also includes a second limiting hole 423 located on the lower side, and a third step 442 is provided on the lifting seat 44. When the lifting seat 44 is passed through the second limiting hole 423, when the push rod mechanism 4 is in the initial state, the lifting seat 44 abuts against the second limiting hole 423 through the third step 442, thereby achieving the purpose of limiting the position of the lifting seat 44 in the lifting direction.

[0166] More preferably, a limiter 443 is provided at the lower part of the third step 442 of the jacking seat 44. When the jacking rod mechanism 4 moves upward and is in the limit state, the limiter 443 can abut against the guide seat 42 to limit the maximum upward movement of the jacking seat 44. In this embodiment, the limiter 443 is an annular flange extending outwardly from the lower end of the jacking seat 44.

[0167] like Fig.19 As shown, each connecting bottom plate 5 is provided with a pair of positioning holes 51. The positions of the positioning holes 51 relative to the connecting bottom plate 5 and the receiving box 11 are as shown in FIG. Fig.19 As shown, the positioning hole 51 is used to cooperate with the positioning pin on the battery exchange device. By setting the positioning hole 51 at the location where the connecting bottom plate 5 is located, the positioning structure is set to fully utilize the space of the gap to avoid the positioning hole 51 and the top rod 41 occupying the space of the storage box 11, thereby affecting the number of battery modules set, resulting in a decrease in battery capacity.

[0168] Among them, the cross-sectional shape of the positioning hole 51 is rectangular, and the length directions of the two positioning holes 51 on each connecting base plate 5 are perpendicular to each other. By setting two rectangular holes with different orientations on both sides of the top rod 41, the positioning accuracy is improved. In this embodiment, the two positioning holes 51 on each connecting base plate 5 are distributed on both sides of the top rod 41 along the length direction A of the longitudinal beam of the vehicle body to make full use of the gap space between adjacent containing boxes 11, so that the battery exchange device and the battery pack can be accurately aligned before unlocking, so that when unlocking, the unlocking mechanism of the battery exchange device can more accurately lift the top rod 41.

[0169] In other specific embodiments, the shape of the positioning hole 51 is not limited to this example, and may also be circular, elliptical, triangular, pentagonal, etc. When the positioning hole 51 is a rectangular hole, the angle between the two positioning holes 51 in the length direction is not necessarily 90°, and may also be other angles that make the length directions of the two positioning holes 51 non-parallel, which will not be repeated here.

[0170] In addition, if Figure 8 and Fig.19 As shown, a weight-reducing hole 52 is also provided on the connecting bottom plate 5 to achieve the purpose of weight reduction.

[0171] like Fig.15 and Fig. 20 As shown, the box body 1 also includes a cable duct 114, which is arranged in the gap and passes through the box body 111 of two adjacent receiving boxes 11, so that the battery cell receiving slots 1111 between each receiving box 11 can be connected through the cable duct 114, so that the cables of the battery modules in different receiving boxes 11 can be gathered in the same receiving box 11 through the cable duct 114, so as to facilitate cable wiring and avoid cable exposure.

[0172] In addition, if Fig. 20 As shown, further, the side wall reinforcement structure 115 fixed on the side surface of the box body 111 is an integral structure, that is, the side wall reinforcement structure 115 extends along the width direction B of the vehicle body longitudinal beam and is simultaneously connected to the side surfaces of the three box bodies 111, thereby achieving overall reinforcement of the box body 1 and better structural consistency between the three containing boxes 11.

[0173] Of course, in other embodiments, the number of the containing boxes 11 may also be two or more than four.

[0174] When there are two storage boxes 11, a gap is formed for setting the locking and matching mechanism 3. When there are four storage boxes 11, three gaps are formed, and the locking and matching mechanism 3 can be set in two of the three gaps, or in all three gaps.

[0175] In other specific embodiments, the body bracket may not be provided, and the locking mechanism 40 may be directly provided on the lower surface of the body longitudinal beam 20. When the battery pack for the electric vehicle is connected to the body longitudinal beam 20, the battery pack for the electric vehicle is located below the body longitudinal beam 20, which will not be repeated here.

[0176] In other specific embodiments, the locking mechanism and the locking matching mechanism are not limited to this example, and may also be a T-type locking method or a threaded locking method. The following briefly introduces the two methods.

[0177] The first type: T-type locking method

[0178] The locking mechanism includes a locking seat, the locking seat has a first opening extending in the vertical direction, a first threaded portion is arranged in the first opening, and the first threaded portion is an internal thread. The locking matching mechanism includes a mounting seat and an unlocking rod, a second opening extending in the vertical direction in the mounting seat, the unlocking rod is vertically arranged in the second opening, the unlocking rod can move in the vertical direction relative to the mounting seat, and the unlocking rod is provided with a second threaded portion matching the first threaded portion, and the second threaded portion can engage with the first threaded portion, thereby realizing locking and unlocking of the locking mechanism and the locking matching mechanism.

[0179] The second method: thread locking

[0180] The locking mechanism includes a locking seat, which has a first opening extending in a vertical direction. A limiting portion is provided in the first opening. The first opening is a square hole and the limiting portion is formed above the first opening. The locking matching mechanism includes an unlocking rod. A stop portion is provided at the upper end of the unlocking rod. The stop portion includes a locking rod extending in a horizontal direction. The locking rod is a columnar body and is horizontally arranged on the top of the unlocking rod. The locking rod and the unlocking rod together form a T-shaped structure.

[0181] When the locking rod is at a first angle, the locking rod can pass through the first opening and enter the limiting portion of the locking seat. When the locking rod is rotated to a second angle, the locking rod can be restricted in the limiting portion, thereby making the locking mechanism and the locking matching mechanism relatively fixed.

[0182] In the above embodiment, the height space below the longitudinal beam 20 of the vehicle body is fully utilized. When the battery swapping device disassembles the battery pack 10, the unloaded battery swapping device can directly enter the space below the battery pack 10 without interfering with the bottom of the electric vehicle 100; when the battery swapping device installs the battery pack 10, the battery swapping device carrying the battery pack 10 can also directly enter the space below the longitudinal beam 20 of the vehicle body for battery swapping without interfering with the bottom of the electric vehicle 100. In the whole process, there is no need to lift the vehicle body, set up a sunken space or dig a pit for the battery swapping equipment to enter and exit, which reduces the cost, time and difficulty of building a battery swapping station, reduces the requirements for the site of the station, and improves the efficiency of battery swapping.

[0183] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A battery pack for an electric vehicle, which is installed on a longitudinal beam of the vehicle body, characterized in that: The battery pack for electric vehicle comprises: A box body, wherein the box body has at least two containing boxes for containing battery modules, and the two containing boxes are spaced apart to form a gap; A locking mechanism, wherein the locking mechanism is disposed in the gap, a locking point between the locking mechanism and the locking mechanism on the vehicle body longitudinal beam is lower than an upper end of the receiving box, and the locking mechanism comprises a horizontally disposed locking shaft, and the locking shaft extends along a width direction of the battery pack; Each of the containing boxes comprises: A box body, wherein a battery cell receiving slot is provided in the box body, and the battery module is arranged in the battery cell receiving slot; A box cover, the box cover is detachably connected to the notch of the battery cell receiving slot of the box body and closes the notch; One end or both ends of the locking shaft are respectively connected to the adjacent box body or box cover plate, and there are multiple locking shafts, and the multiple locking shafts are arranged along the length direction of the vehicle body longitudinal beam.

2. The battery pack for electric vehicles according to claim 1, characterized in that: The containing box further comprises a sealing member, which is arranged around the notch of the battery cell containing groove and is sandwiched between the box body and the box cover.

3. The battery pack for electric vehicle according to claim 1, characterized in that: A fixing block is arranged in the gap, both ends of the lock shaft are connected to the fixing block, and the fixing block is connected to the adjacent box body or box cover.

4. The battery pack for electric vehicle according to claim 3, characterized in that: Adjacent containing boxes are connected by a gap connection structure to form the gap; The gap junction structure comprises: The fixing block is connected to the box body of the adjacent containing box through the cover plate.

5. The battery pack for electric vehicle according to claim 4, characterized in that: The cover plate is provided with a locking hole at a position corresponding to the locking mechanism, and the locking shaft is located below the locking hole.

6. The battery pack for electric vehicle according to claim 4, characterized in that: The gap connection structure also includes a pair of C-shaped connecting plates, which extend along the length direction of the vehicle body longitudinal beam. The opening directions of the pair of C-shaped connecting plates are arranged in opposite directions, and the fixing blocks are clamped in the C-shaped connecting plates on the corresponding sides.

7. The battery pack for electric vehicle according to claim 6, characterized in that: The gap connection structure further includes a first support plate, which is disposed between a pair of the C-shaped support connection plates, and the first support plate is respectively connected to the pair of the C-shaped connection plates at both ends along the width direction of the vehicle body longitudinal beam.

8. The battery pack for electric vehicle according to claim 7, characterized in that: The gap connection structure further includes a second support plate, which is disposed below the C-shaped connection plate and is connected to the first support plate and the cover plate respectively.

9. The battery pack for electric vehicle according to claim 1, characterized in that: The battery pack for electric vehicles also includes a push rod mechanism for unlocking the locking mechanism, the push rod mechanism is arranged in the gap, the push rod mechanism includes a push rod, and the push rod is vertically arranged and can move along the vertical direction.

10. The battery pack for electric vehicle according to claim 9, characterized in that: The battery pack for electric vehicles further comprises a connecting bottom plate, which is arranged in the gap, and two ends of the connecting bottom plate are respectively connected to the two box bodies; The push rod mechanism also includes a guide seat arranged on the connecting bottom plate, the guide seat is provided with a guide hole, and the push rod is inserted into the guide hole.

11. The battery pack for electric vehicle according to claim 10, characterized in that: The push rod mechanism also includes a first elastic member. A limiting portion is provided on the push rod. Two ends of the first elastic member are respectively connected to the guide seat and the limiting portion. The first elastic member is used to apply a force to the limiting portion to move the push rod downward.

12. The battery pack for electric vehicle according to claim 11, characterized in that: The first elastic member is sleeved on the top rod.

13. The battery pack for electric vehicle according to claim 10, characterized in that: The ejector mechanism also includes: A jacking seat, wherein the jacking seat is movably arranged on the connecting bottom plate and a transition groove is provided at one end of the jacking seat close to the ejector rod, the groove depth direction of the transition groove is the vertical direction, and one end of the ejector rod close to the connecting bottom plate extends into the transition groove and can move in the transition groove along the groove depth direction of the transition groove; A second elastic member, wherein the lifting seat and the lifting rod are elastically connected through the second elastic member.

14. The battery pack for electric vehicle according to claim 13, characterized in that: The push rod is provided with a first step, the second elastic member is sleeved on the push rod and the first end of the second elastic member is abutted against the first step, and the second end of the second elastic member is abutted against the lifting seat.

15. The battery pack for electric vehicle according to claim 10, characterized in that: The guide seat is provided with a first limiting hole, the first limiting hole is coaxially arranged with the guide hole, the push rod is provided with a second step, and the push rod is inserted into the first limiting hole; When the push rod mechanism is in an initial state, the second step of the push rod abuts against the first limiting hole.

16. The battery pack for electric vehicle according to claim 13, characterized in that: The guide seat is provided with a second limiting hole, the lifting seat is provided with a third step, and the lifting seat is inserted into the second limiting hole; When the ejector mechanism is in an initial state, the third step of the ejector seat abuts against the second limiting hole.

17. The battery pack for electric vehicle according to claim 16, characterized in that: A limiter is provided on the portion of the jacking seat below the third step of the jacking seat; When the push rod mechanism is in the limit state, the limiting member abuts against the guide seat.

18. The battery pack for electric vehicle according to claim 10, characterized in that: At least one pair of positioning holes is also provided on the connecting base plate, and the positioning holes are used to cooperate with the positioning pins on the battery exchange equipment.

19. The battery pack for electric vehicle according to claim 18, characterized in that: The cross-sectional shape of the positioning holes is rectangular, and the length directions of the two positioning holes are different.

20. The battery pack for electric vehicle according to claim 18, characterized in that: The positioning holes are distributed on both sides of the push rod along the length direction of the vehicle body longitudinal beam.

21. The battery pack for electric vehicle according to claim 10, characterized in that: The connecting bottom plate is provided with weight-reducing holes.

22. The battery pack for electric vehicle according to claim 1, characterized in that: The battery pack for electric vehicles also includes a second electrical connector for docking with the first electrical connector on the vehicle body longitudinal beam, the second electrical connector is arranged at a position of the box body corresponding to the first electrical connector, and the second electrical connector is electrically connected to the battery module.

23. The battery pack for electric vehicle according to claim 22, characterized in that: The box also includes: A cable duct is provided in the gap, and the battery cell receiving slots of adjacent receiving boxes are connected through the cable duct.

24. The battery pack for electric vehicles according to any one of claims 1 to 23, characterized in that: The number of the accommodating boxes is three, the three accommodating boxes are arranged at intervals to form two gaps, and the locking and matching mechanisms are respectively arranged in the two gaps.

25. An electric vehicle, characterized in that: It comprises a vehicle body longitudinal beam and a battery pack for an electric vehicle as described in any one of claims 1 to 24, wherein a locking mechanism is provided on the vehicle body longitudinal beam, and the battery pack for an electric vehicle is detachably connected to the vehicle body longitudinal beam by cooperating with the locking mechanism through the locking cooperation mechanism.

26. The electric vehicle according to claim 25, characterized in that: The electric vehicle further comprises a vehicle body bracket, wherein the vehicle body bracket is arranged on the vehicle body longitudinal beam, and the locking mechanism is arranged on the vehicle body bracket.

27. The electric vehicle according to claim 25 or 26, characterized in that: The locking matching mechanism includes a horizontally arranged locking shaft, and the locking shaft extends along the width direction of the vehicle body longitudinal beam, and the locking mechanism includes a through slot for the locking shaft to pass through.

28. The electric vehicle according to claim 26, characterized in that: The top of the battery pack for electric vehicles is located below the vehicle body bracket or the vehicle body longitudinal beam.

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