Liquid-cooled battery box

Abstract

The liquid-cooled battery box comprises a shell, a fixed support, a plurality of stiffening beams and two bearing blocks, a first side plate and a second side plate are arranged on the two opposite sides of the shell respectively, a cooling liquid inlet and a cooling liquid outlet are formed in the lower end face of the shell, and a cooling liquid flow channel communicated with the cooling liquid inlet and the cooling liquid outlet is formed in the shell. The first side plate and the second side plate form part of the side wall of the cooling liquid flow channel, the fixing support is installed on the upper end face of the shell and used for fixing a battery cell module end plate, the reinforcing beams are installed on the lower end face of the shell at intervals, one end of each bearing block is detachably provided with a hanging ring, and the other end of each bearing block is fixedly connected with the first side plate or the second side plate. According to the scheme, the overall structure is simple, the structural strength of the electric shell is improved through the arrangement of the reinforcing beams, the bearing capacity of the box body can be increased, the mechanical performance for resisting transportation impact is improved, the lifting rings are convenient to mount and dismount through the arrangement of the bearing blocks, and the shell is not prone to damage when the battery box is moved out.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery systems, and in particular relates to a liquid-cooled battery box. Background Art

[0002] At present, with the rapid development of electric vehicles, renewable energy and other fields, the demand for energy storage systems is also increasing. At present, there are two mainstream thermal management methods for battery packs in the energy storage industry: air cooling and liquid cooling. The proportion of liquid cooling solutions is increasing with the increase of battery cell capacity and heating power. Liquid cooling solutions mostly adopt a lower box integrated design, and the liquid cooling channel is integrated with the lower box of the battery. On the one hand, the liquid-cooled battery box must ensure sufficient strength to withstand the weight of the battery module while resisting the impact caused by transportation vibration, especially export sea transportation; on the other hand, the liquid-cooled battery box must have excellent flatness so that the thermal conductive structural glue between the battery cell and the liquid cooling plate is evenly distributed to avoid abnormal local heating. In order to improve strength and excellent flatness, the common structure is more complicated and reduces the sealing of the box.

[0003] Therefore, a new technology is needed to solve the problems of complex box structure and poor sealing of liquid-cooled energy storage in the liquid-cooled battery box in the prior art. Utility Model Content

[0004] In order to solve the above problems in the prior art, the utility model provides a liquid-cooled battery box, whose liquid-cooled energy storage lower box structure has the effects of simple structure and good sealing.

[0005] The utility model adopts the following technical solutions:

[0006] A liquid-cooled battery box, comprising a shell, a fixing bracket, a plurality of reinforcing beams and two load-bearing blocks, wherein a first side plate and a second side plate are respectively disposed on opposite sides of the shell, a cooling liquid flow channel is disposed inside the shell, the first side plate and the second side plate form part of the side wall of the cooling liquid flow channel, the fixing bracket is mounted on the upper end surface of the shell and is used to fix the battery cell module end plate, a plurality of the reinforcing beams are installed at intervals on the lower end surface of the shell, a cooling liquid inlet and a cooling liquid outlet are also spaced apart on the lower end surface of the shell, and the cooling liquid inlet and the cooling liquid outlet are communicated through the cooling liquid flow channel;

[0007] A lifting ring is detachably mounted on one end of each load-bearing block, and the other end is fixedly connected to the first side plate or the second side plate.

[0008] As a further improvement of the technical solution of the utility model, the first side panel and the second side panel are both hollow, and one end of the load-bearing block away from the lifting ring is inserted into the first side panel or the second side panel and fixedly connected by welding.

[0009] As a further improvement of the technical solution of the utility model, the shell is provided with a first mounting hole and a second mounting hole for fixedly mounting the shell, the first side panel is provided with a first through hole, the second side panel is provided with a second through hole, and the two load-bearing blocks are respectively provided with a first through hole equal to the inner diameter of the first through hole and a second through hole equal to the inner diameter of the second through hole; the first through hole is coaxial with the first through hole and connected to each other to form the first mounting hole, and the second through hole is coaxial with the second through hole and connected to each other to form the second mounting hole.

[0010] As a further improvement of the technical solution of the utility model, the lower ends of the first side plate and the second side plate are protruded from the lower end surface of the shell, and the two ends of each reinforcement beam are detachably fixedly connected to the first side plate and the second side plate respectively.

[0011] As a further improvement of the technical solution of the utility model, the fixed bracket includes two parallel and spaced first fixed beams and a second fixed beam, the first fixed beam and the first side plate are perpendicular to each other, the first fixed beam and the second fixed beam are detachably fixedly connected to the end plate of the battery module, and the first fixed beam and the second fixed beam have the same structure;

[0012] A plurality of evenly spaced limit rubber sheets are installed between the first fixed beam and the second fixed beam, each of the limit rubber sheets is perpendicular to the first fixed beam, and the thickness of the glue between the battery cell and the upper end surface of the shell is equal to the thickness of the limit rubber sheets.

[0013] As a further improvement of the technical solution of the utility model, the shell includes a first body and a second body connected to each other, the coolant flow channel includes a first flow channel and a second flow channel connected to each other, the first flow channel is arranged inside the first body, and the second flow channel is arranged inside the second body;

[0014] The first body and the second body are butted against each other, and the lower surfaces thereof jointly form the lower end surface of the shell, and the upper surfaces thereof jointly form the upper end surface of the shell; the inlet is arranged on the first body, and the outlet is arranged on the second body;

[0015] The first side plate is located at a side of the first body away from the second body, a first connecting plate is provided on a side of the first body opposite to the first side plate, the second side plate is located at a side of the second body away from the first body, and a second connecting plate butted against the first connecting plate is provided on the second body; a first notch and a second notch are respectively provided at both ends of the first connecting plate, a third notch and a fourth notch are respectively provided at both ends of the second connecting plate, the first notch and the third notch correspond to and are connected to each other, and the second notch and the fourth notch correspond to and are connected to each other;

[0016] Part of the film limiting sheet is installed on the first main body, and another part of the film limiting sheet is installed on the second main body.

[0017] As a further improvement of the technical solution of the utility model, the shell further includes a first end plate and a second end plate arranged opposite to each other, the first main body has two opposite ends respectively provided with a first opening and a second opening, and the second main body has two opposite ends respectively provided with a third opening and a fourth opening;

[0018] The left and right parts of the first end plate respectively block the first opening and the third opening, and the left and right ends are detachably fixedly connected to the first side plate and the second side plate;

[0019] The left and right parts of the second end plate respectively block the second opening and the fourth opening, and the left and right ends are detachably fixedly connected to the first side plate and the second side plate.

[0020] As a further improvement of the technical solution of the utility model, the first opening is communicated with the first notch, the second opening is communicated with the second notch; the third opening is communicated with the third notch, and the fourth opening is communicated with the fourth notch.

[0021] As a further improvement of the technical solution of the utility model, a first blocking portion is provided on one side of the first end plate, and the other side is flush with one end surface of the first side plate and the second side plate, and the first blocking portion is inserted into the first opening and the third opening to block the first opening and the third opening;

[0022] A second blocking portion is provided on one side of the second end plate, and the other side is flush with the other end surface of the first side plate and the second side plate. The second blocking portion is inserted into the second opening and the fourth opening to block the second opening and the fourth opening.

[0023] As a further improvement of the technical solution of the utility model, the left and right parts of each reinforcing beam are detachably fixedly connected to the first main body and the second main body respectively;

[0024] The left and right parts of the first fixed beam are detachably fixedly connected to the first main body and the second main body respectively.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The liquid-cooled battery box shell of this solution is designed with a reinforcing beam on the back, which greatly improves the strength of the shell of the lower box of the battery box, can increase the load-bearing capacity of the box, and improve the mechanical properties of resisting transportation impact. A lifting ring is detachably installed at one end of each load-bearing block, and the other end is fixedly connected to the first side panel or the second side panel. By installing the lifting ring on each load-bearing block, it can be connected to the removal equipment or tooling through the lifting ring to move the battery pack out of the cluster rack. When the battery box is moved out through the lifting ring, it is not easy to cause damage to the overall structure of the battery box shell. When the battery box does not need to be removed, the lifting ring can be removed, and the load-bearing blocks fixed on the two side panels of the shell provide a connection basis with the removal equipment or tooling, and there is no need to set up a lifting frame, which simplifies the overall structure and corresponding processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The technology of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0028] Figure 1 It is an axonometric diagram of the overall structure of the utility model from the front view;

[0029] Figure 2 It is an axonometric diagram of the overall structure of the utility model from the back side;

[0030] Figure 3 It is a schematic diagram of the structure of this load-bearing block.

[0031] Reference numerals:

[0032] 1-shell; 11-first body; 111-first side plate; 112-inlet; 12-second body; 121-second side plate; 122-outlet; 13-first end plate; 14-second end plate;

[0033] 2- Strengthening beam;

[0034] 3-fixed bracket; 31-first fixed beam; 32-second fixed beam;

[0035] 4- load-bearing block; 41- through hole; 42- connection hole;

[0036] 5-Limited film;

[0037] 6- Rings;

[0038] 7-first mounting hole;

[0039] 8- Second mounting hole. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, scheme and effect of the utility model. It should be noted that the embodiments and features in the embodiments in this application can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0041] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the accompanying drawings.

[0042] Reference Figures 1 to 3 A liquid-cooled battery box includes a shell 1, a fixing bracket 3, a plurality of reinforcing beams 2 and two load-bearing blocks 4. The shell is the main structure of the liquid cooling plate. The shell 1 is provided with a first side plate 111 and a second side plate 121 on opposite sides respectively. A cooling liquid flow channel is provided inside the shell 1. The first side plate 111 and the second side plate 121 form part of the side walls of the cooling liquid flow channel. The fixing bracket 3 is installed on the upper end surface of the shell 1 and is used to fix the end plate of the battery cell module. A plurality of reinforcing beams 2 are evenly installed on the lower end surface of the shell 1. Each reinforcing beam 2 is parallel to each other and perpendicular to the first side plate 111 and the second side plate 121. The provision of the reinforcing beams 2 improves the structural strength of the battery box shell 1, can increase the load-bearing capacity of the box, and improves the mechanical properties of resisting transportation impact. In general, the upper end surface of the shell is regarded as the front surface of the battery box shell. The axonometric drawing of the overall structure of this scheme from the front perspective is referred to. Figure 1 , the lower end face of the shell is regarded as the back side of the battery box shell, and the axonometric drawing of the overall structure of this scheme from the back side is referred to Figure 2. A coolant inlet 112 and a coolant outlet 122 are also provided on the lower end surface of the shell 1 at intervals, and the coolant inlet 112 is connected to the coolant outlet 122 through the coolant flow channel. A lifting ring 6 is detachably mounted on one end of each of the load-bearing blocks 4, and the other end is fixedly connected to the first side plate 111 or the second side plate 121. The fixed connection between the load-bearing block 4 and the battery box shell 1 makes its connection structure more stable. By installing the lifting ring 6 on each load-bearing block 4, the lifting ring 6 can be connected to the removal equipment or tooling to move the battery pack out of the cluster rack. When the battery box does not need to be removed, the lifting ring 6 can be removed, and the load-bearing blocks 4 fixed on the two side plates of the shell 1 provide a connection foundation with the removal equipment or tooling. When the battery box is removed by the lifting ring 6, it is not easy to cause damage to the overall structure of the battery box shell 1, and there is no need to set up a lifting frame, which simplifies the overall structure and the corresponding processing technology. The setting of the reinforcing beam 2 and the load-bearing block 4 will not destroy the sealing of the lower box of the liquid-cooled energy storage.

[0043] Specifically, the first side panel 111 and the second side panel 121 are both hollow, and one end of the load-bearing block 4 away from the lifting ring 6 is inserted into the first side panel 111 or the second side panel 121 and fixedly connected by welding. Compared with the single-layer plate-shaped side panel structure, the first side panel 111 and the second side panel 121 are hollow. On the one hand, they can provide an installation basis for the installation of the embedded load-bearing block 4, so that it is connected with the load-bearing block 4 to form an integral structure. On the other hand, they can reduce the deadweight of the battery box shell 1 while improving the structural strength of the battery box shell 1, improving the mechanical properties of the box body in terms of bearing weight and resisting transportation impact, and reducing the deadweight of the battery box shell 1 also saves manufacturing costs. The load-bearing block 4 can be threadedly connected to the lifting ring 6, which is convenient for installation and disassembly. It is only necessary to open a threaded hole on the load-bearing block 4, and there is no need to open a threaded hole on the shell 1 structure. The battery box shell 1 structure will not be damaged during hoisting. Among them, according to actual needs, the hollow structure of the first side plate 111 and the second side plate 121 can form a part of the coolant flow channel for the coolant to flow through, and corresponding openings are set on the side where the first side plate 111 and the second side plate 121 are close to each other for the coolant to pass through. One end of the first side plate 111 and the second side plate 121 is a blind end without an opening, and the other end is set with an opening and blocked by the load-bearing block 4. Each load-bearing block 4 is connected to the corresponding first side plate 111 and the second side plate 121 by welding, and the sealing is good.

[0044] Specifically, the shell 1 is provided with a first mounting hole 7 and a second mounting hole 8 for fixedly mounting the shell 1, the first side plate 111 is provided with a first through hole, the second side plate 121 is provided with a second through hole, the first through hole and the second through hole have the same diameter, and the two load-bearing blocks 4 are respectively provided with through holes 41 having the same inner diameter as the first through hole or the second through hole, and the through holes 41 on the two load-bearing blocks 4 can be divided into a first through hole 41 having the same inner diameter as the first through hole and a second through hole 41 having the same inner diameter as the second through hole; the first through hole is coaxial with the first through hole 41 and interconnected to form the first mounting hole 7, and the second through hole is coaxial with the second through hole 41 and interconnected to form the second mounting hole 8. The provision of the load-bearing block 4 improves the structural strength of the connection node of the battery pack mounting structure, and it is not easy to cause damage to the shell 1 structure at this connection node during fixed installation. Each load-bearing block 4 is welded and fixed to the first side plate 111 and the second side plate 121 on the housing 1. When the battery pack is installed and fixed, the bolt passes through the first mounting hole 7 or the second mounting hole 8 and is fixed to the cluster frame to ensure the structural strength of the bolt fixing point and the fixing bolt does not have torque attenuation. When the battery pack is disassembled, the lifting ring 6 is fixed to the connection hole 42 of the load-bearing block 4, and the connection hole 42 is a threaded hole. The battery pack can be moved out of the cluster frame using equipment and tooling.

[0045] Specifically, the upper end surfaces of the first side panel 111 and the second side panel 121 are flush with the upper end surface of the shell 1; the lower ends of the first side panel 111 and the second side panel 121 are protruded from the lower end surface of the shell 1, and the two ends of each reinforcing beam 2 are detachably fixedly connected to the first side panel 111 and the second side panel 121 respectively.

[0046] Specifically, the fixing bracket 3 includes two parallel and spaced first fixing beams 31 and second fixing beams 32, the first fixing beam 31 and the first side plate 111 are perpendicular to each other, the first fixing beam 31 and the second fixing beam 32 are detachably fixedly connected to the end plate of the battery module, and the first fixing beam 31 and the second fixing beam 32 have the same structure. A number of evenly spaced limiting rubber sheets 5 are installed between the first fixing beam 31 and the second fixing beam 32, each of which is perpendicular to the first fixing beam 31. Glue is used between the battery cell and the upper end surface of the shell 1 to conduct heat and fix the battery cell. The glue is often a heat-conducting structural glue. The coolant flows through the liquid cooling plate made of aluminum alloy and then completes the heat exchange and transfer through the heat-conducting structural glue between the battery cell and the liquid cooling plate. The heat-conducting structural glue can reliably fix the battery cell on the shell, that is, fix it on the plane at the upper end of the liquid cooling plate. The thickness of the limiting rubber sheet 5 is equal to the thickness of the glue between the battery cell and the upper end surface of the shell 1, which can make the heat-conducting structural glue between the battery cell and the liquid cooling plate evenly distributed to avoid abnormal local heating. The front of the battery box shell 1 structure is designed with a battery cell limiting film 5, and the upper end face of the shell is a planar structure. Under certain circumstances, when the flatness of the upper end face of the battery box shell is small enough, the thickness of the glue between the battery cell and the liquid cooling plate is equal to the thickness of the limiting film 5. At this time, the thermal conductive structural glue between the battery cell and the liquid cooling plate is evenly distributed to avoid abnormal local heating. In this solution, the side of the shell that contacts the battery cell is a plane. The liquid cooling plate structure made of aluminum profiles commonly used in the market is provided with a high frame or a low frame surrounding the battery cell. In this solution, the side in contact with the battery cell is set as a planar structure, which reduces the material cost of the production and also reduces the weight of the overall structure.

[0047] Specifically, the shell 1 includes a first main body 11 and a second main body 12 that are butted against each other. The first main body 11 and the second main body 12 are connected by friction stir welding (FSW). The first main body 11 and the second main body 12 respectively form the flow channel plate main body on the left and right sides, and form a whole liquid cooling plate main body after being butted against each other. The coolant flow channel includes a first flow channel and a second flow channel that are interconnected. The first flow channel is arranged inside the first main body 11, and the second flow channel is arranged inside the second main body 12. The first main body 11 and the second main body 12 are butted against each other, and the lower surfaces jointly form the lower end surface of the shell 1, and the upper surfaces jointly form the upper end surface of the shell 1; the inlet 112 is arranged on the first main body 11, and the outlet 122 is arranged on the second main body 12. The inlet 112 is arranged on one end of the first main body 11 close to the first end plate 13, and the outlet 122 is arranged on one end of the second main body 12 close to the first end plate 13. The first side plate 111 is located on the side of the first main body 11 away from the second main body 12, a first connecting plate is provided on the side of the first main body 11 opposite to the first side plate 111, the second side plate 121 is located on the side of the second main body 12 away from the first main body 11, and a second connecting plate is provided on the second main body 12 to connect with the first connecting plate; the first connecting plate is provided with a first notch and a second notch at both ends, and the second connecting plate is provided with a third notch and a fourth notch at both ends, the first notch and the third notch correspond to each other and are connected to allow the coolant to flow through, and the second notch and the fourth notch correspond to each other and are connected to allow the coolant to flow through. Part of the limiting film 5 is installed on the first main body 11, and the other part of the limiting film 5 is installed on the second main body 12.

[0048] Specifically, the shell 1 further includes a first end plate 13 and a second end plate 14 arranged opposite to each other, and the first main body 11 has two opposite ends provided with a first opening and a second opening, respectively, and the second main body 12 has two opposite ends provided with a third opening and a fourth opening, respectively. The left and right parts of the first end plate 13 respectively block the first opening and the third opening, and the left and right ends are detachably fixedly connected to the first side plate 111 and the second side plate 121. The left and right parts of the second end plate 14 respectively block the second opening and the fourth opening, and the left and right ends are detachably fixedly connected to the first side plate 111 and the second side plate 121, and the first end plate 13 and the second end plate 14 respectively form front and rear blocking blocks of the coolant flow channel. Among them, the first end plate 13 is sealed and welded to one end of the first main body 11 and the second main body 12 by stir friction welding, and the second end plate 14 is sealed and welded to the first main body 11 and the second main body 12 by stir friction welding. When manufacturing the shell 1 structure, the first main body 11 and the second main body 12 can be first connected by stir friction welding (FSW) to form a whole flow channel plate, and then the first end plate 13 and the second end plate 14 are respectively sealed and welded to the front and rear end openings of the whole flow channel plate by stir friction welding, and finally the first fixed beam 31 and the second fixed beam 32 of the front and rear of the module are welded.

[0049] Specifically, the first opening is communicated with the first notch, the second opening is communicated with the second notch; the third opening is communicated with the third notch, and the fourth opening is communicated with the fourth notch.

[0050] Specifically, a first blocking portion is provided on one side of the first end plate 13, and the other side is flush with one end surface of the first side plate 111 and the second side plate 121, and the first blocking portion is inserted into the first opening and the third opening to block the first opening and the third opening. A second blocking portion is provided on one side of the second end plate 14, and the other side is flush with the other end surface of the first side plate 111 and the second side plate 121, and the second blocking portion is inserted into the second opening and the fourth opening to block the second opening and the fourth opening.

[0051] Specifically, the left and right parts of each reinforcing beam 2 are detachably fixedly connected to the first body 11 and the second body 12 respectively, and the left and right parts of the first fixing beam 31 are detachably fixedly connected to the first body 11 and the second body 12 respectively.

[0052] Specifically, the first fixed beam 31 and the second fixed beam 32 are provided with a plurality of threaded holes for fixing the end plate of the battery module. The first flow channel and the second flow channel both include a plurality of branch channels interconnected with each other. The flow path pattern formed by the connection of these branch channels can be arranged in a conventional manner. The first main body 11 and the second main body 12 are similar in structure, and are provided with a panel and a back plate parallel to each other. A plurality of spaced partitions are provided between the panel and the back plate. Each partition can be perpendicular to the panel and the back plate and tightly connected, and a branch channel for the coolant to pass through is formed between two adjacent partitions. In this scheme, the reinforcing beam 2 adopts a U-shaped structure 6 series aluminum profile, and the reinforcing beam 2 can resist the impact deformation of the battery box shell 1 in the Z direction, that is, the impact deformation perpendicular to the panel and the back plate. The reinforcing beam 2 is arranged close to the back plate of the flow channel plate, and preferably uses a hot melt self-tapping screw connection process (FDS) to fix each reinforcing beam 2 on the first main body 11 and the second main body 12. Part of the partitions in this solution are thickened and made of solid material with a relatively wide thickness. The threaded holes on the first body 11 and the second body 12 that are threadedly connected to the reinforcing beams 2 can be set at the location of the thickened partitions. During production, the self-tapping screws pass through the avoidance openings of the reinforcing beams 2 and are fixed in the solid material of the thickened partitions of the flow channel. This connection node will neither affect the sealing performance of the flow channel nor the sealing of the battery cell cavity. In addition, the heat of the FDS process is almost negligible compared to other welding processes, and has a low impact on the flatness of the contact surface of the flow channel plate and the battery cell. Among them, the first body 11, the second body 12, the first end plate 13, the second end plate 14, the first fixed beam 31, and the second fixed beam 32 are all made of 6 series aluminum profiles, which can provide relatively high mechanical strength.

[0053] For other contents of the liquid-cooled battery box described in the present invention, please refer to the prior art and will not be described in detail here.

[0054] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A liquid-cooled battery box, characterized in that: It comprises a shell, a fixing bracket, a plurality of reinforcing beams and two load-bearing blocks, the first side plate and the second side plate are respectively provided on opposite sides of the shell, a coolant flow channel is provided inside the shell, the first side plate and the second side plate form part of the side wall of the coolant flow channel, the fixing bracket is installed on the upper end surface of the shell and is used to fix the end plate of the battery core module, a plurality of reinforcing beams are installed on the lower end surface of the shell at intervals, a coolant inlet and a coolant outlet are also provided on the lower end surface of the shell at intervals, and the coolant inlet and the coolant outlet are communicated through the coolant flow channel; One end of each load-bearing block is detachably mounted with a lifting ring, and the other end is fixedly connected to the first side plate or the second side plate.

2. The liquid-cooled battery box according to claim 1, characterized in that: The first side plate and the second side plate are both hollow, and one end of the load-bearing block away from the lifting ring is inserted into the first side plate or the second side plate and fixedly connected by welding.

3. The liquid-cooled battery box according to claim 2, characterized in that: The shell is provided with a first mounting hole and a second mounting hole for fixing the shell, the first side panel is provided with a first through hole, the second side panel is provided with a second through hole, and the two load-bearing blocks are respectively provided with a first through hole equal to the inner diameter of the first through hole and a second through hole equal to the inner diameter of the second through hole; the first through hole is coaxial with the first through hole and connected to each other to form the first mounting hole, and the second through hole is coaxial with the second through hole and connected to each other to form the second mounting hole.

4. The liquid-cooled battery box according to claim 1, characterized in that: The lower ends of the first side plate and the second side plate are protruded from the lower end surface of the shell, and the two ends of each reinforcement beam are detachably fixedly connected to the first side plate and the second side plate respectively.

5. The liquid-cooled battery box according to claim 4, characterized in that: The fixing bracket includes two parallel and spaced first and second fixing beams, the first fixing beam and the first side plate are perpendicular to each other, the first fixing beam and the second fixing beam are detachably fixedly connected to the end plate of the battery module, and the first fixing beam and the second fixing beam have the same structure; A plurality of evenly spaced limit rubber sheets are installed between the first fixed beam and the second fixed beam, each of the limit rubber sheets is perpendicular to the first fixed beam, and the thickness of the glue between the battery cell and the upper end surface of the shell is equal to the thickness of the limit rubber sheets.

6. The liquid-cooled battery box according to claim 5, characterized in that: The housing comprises a first body and a second body connected to each other, the coolant flow channel comprises a first flow channel and a second flow channel connected to each other, the first flow channel is arranged inside the first body, and the second flow channel is arranged inside the second body; The first body and the second body are butted against each other, and the lower surfaces thereof jointly form the lower end surface of the shell, and the upper surfaces thereof jointly form the upper end surface of the shell; the inlet is arranged on the first body, and the outlet is arranged on the second body; The first side plate is located at a side of the first body away from the second body, a first connecting plate is provided on a side of the first body opposite to the first side plate, the second side plate is located at a side of the second body away from the first body, and a second connecting plate butted against the first connecting plate is provided on the second body; a first notch and a second notch are respectively provided at both ends of the first connecting plate, a third notch and a fourth notch are respectively provided at both ends of the second connecting plate, the first notch and the third notch correspond to and are connected to each other, and the second notch and the fourth notch correspond to and are connected to each other; Part of the film limiting sheet is installed on the first main body, and another part of the film limiting sheet is installed on the second main body.

7. The liquid-cooled battery box according to claim 6, characterized in that: The housing further comprises a first end plate and a second end plate which are arranged opposite to each other, the first body has a first opening and a second opening at two opposite ends respectively, and the second body has a third opening and a fourth opening at two opposite ends respectively; The left and right parts of the first end plate respectively block the first opening and the third opening, and the left and right ends are detachably fixedly connected to the first side plate and the second side plate; The left and right parts of the second end plate respectively block the second opening and the fourth opening, and the left and right ends are detachably fixedly connected to the first side plate and the second side plate.

8. The liquid-cooled battery box according to claim 7, characterized in that: The first opening is communicated with the first notch, the second opening is communicated with the second notch; the third opening is communicated with the third notch, and the fourth opening is communicated with the fourth notch.

9. The liquid-cooled battery box according to claim 8, characterized in that: A first blocking portion is provided on one side of the first end plate, and the other side is flush with one end surface of the first side plate and the second side plate, and the first blocking portion is inserted into the first opening and the third opening to block the first opening and the third opening; A second blocking portion is provided on one side of the second end plate, and the other side is flush with the other end surface of the first side plate and the second side plate. The second blocking portion is inserted into the second opening and the fourth opening to block the second opening and the fourth opening.

10. The liquid-cooled battery box according to claim 6, characterized in that: The left and right parts of each reinforcement beam are detachably fixedly connected to the first main body and the second main body respectively; The left and right parts of the first fixed beam are detachably fixedly connected to the first main body and the second main body respectively.

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