Liquid-cooled battery pack

Abstract

The present application relates to the technical field of immersed liquid-cooled battery packs, and in particular to a liquid-cooled battery pack, comprising a box and a battery module arranged in the box, the battery module comprising a battery cell, a first end plate and a second end plate, the number of battery cells is multiple, and they are arranged in sequence along a preset direction, and the battery cells can expand along the preset direction; along the expansion direction of the battery cell, the first end plate and the second end plate are respectively located on the opposite sides of the first battery cell and the last battery cell, and the first end plate is fixedly connected to the box, and the second end plate is slidably connected to the box, so that the battery cell can move along the expansion direction of the battery cell. In the present application, one end of the battery module is fixed, and the other end of the battery module can move along the expansion direction of the battery cell, thereby reducing the squeezing of the flow channel between the battery cells by the expansion of the battery cell, ensuring the width of the flow channel, avoiding safety accidents caused by reduced cooling efficiency, and thus improving the safety and reliability of the battery pack.

Description

Technical Field

[0001] The present application relates to the technical field of immersed liquid-cooled battery packs, and in particular to a liquid-cooled battery pack. Background Art

[0002] With the development of industrial and commercial energy storage, the thermal safety performance of energy storage products has attracted more and more attention. At present, the main cooling methods for industrial and commercial energy storage products on the market are air cooling and liquid cooling. The heat dissipation efficiency of air cooling is relatively low. Although the heat dissipation efficiency of liquid cooling has been improved, the liquid cooling plate is usually located at the bottom of the battery cell, the heat dissipation is uneven, and the battery cell temperature near the liquid inlet is low, and the battery cell temperature near the liquid outlet is high, which affects the service life of the battery cell. Therefore, an immersion liquid cooling solution was proposed. The battery pack is filled with coolant, so that the battery cell is immersed in the coolant, and the heat generated by the battery cell during operation is taken away by the circulation of the coolant. For the immersion liquid cooling solution using a large-surface flow channel of the battery cell, since the battery cell will undergo irreversible expansion during operation, the flow channel between the battery cells is constantly squeezed, the flow channel width gradually decreases, and the flow of the coolant is hindered, which seriously affects the cooling efficiency and may eventually cause safety accidents of energy storage products. Utility Model Content

[0003] The purpose of the present application is to provide a liquid-cooled battery pack, which to a certain extent solves the technical problem existing in the prior art that in the immersed liquid-cooled battery pack, the battery cells will undergo irreversible expansion during operation, the flow channels between the battery cells are constantly squeezed, the flow channel width gradually decreases, and the flow of the coolant is hindered, which seriously affects the cooling efficiency and may eventually cause safety accidents of energy storage products.

[0004] The present application provides a liquid-cooled battery pack, comprising: a box body and a battery module disposed in the box body; wherein the battery module comprises a battery cell, a first end plate and a second end plate, the number of the battery cells is multiple, and the multiple battery cells are sequentially arranged along a preset direction, and the battery cells can expand along the preset direction;

[0005] Along the expansion direction of the battery cell, the first end plate and the second end plate are respectively located on the opposite sides of the first battery cell and the last battery cell, and the first end plate is fixedly connected to the box body, and the second end plate is slidably connected to the box body, so that the battery cell can move along the expansion direction of the battery cell.

[0006] In the above technical solution, further, the liquid-cooled battery pack also includes a first fastening member, a guide rail and a slider; wherein the guide rail is fixed to the box wall of the box body; the second end plate is connected to the slider through the first fastening member, and the slider is slidably connected to the guide rail.

[0007] In any of the above technical solutions, further, the box wall of the box body on which the guide rail is installed is a double-layer structure, the double-layer structure includes an inner plate and an outer plate, and the inner plate and the outer plate are arranged at intervals to form an installation space;

[0008] The guide rail and at least a part of the structure of the slider are both arranged in the installation space, and the guide rail is fixed to the outer plate; the inner plate is formed with a first avoidance opening for avoiding the first fastening member.

[0009] In any of the above technical solutions, further, the liquid-cooled battery pack further includes a support beam, the support beam is arranged in the installation space and fixed to the outer plate; the support beam is formed with an installation cavity, an opening communicating with the installation cavity, and a second avoidance opening, and the guide rail is arranged in the installation cavity and fixed to the support beam;

[0010] The sliding block extends into the installation cavity through the second avoidance opening and is slidably connected to the guide rail; the inner plate is connected to the support beam.

[0011] In any of the above technical solutions, further, the liquid-cooled battery pack also includes a second fastening member, and the guide rail is detachably connected to the support beam through the second fastening member.

[0012] In any of the above technical solutions, further, the liquid-cooled battery pack also includes a third fastening member, and the inner plate is detachably connected to the support beam through the third fastening member.

[0013] In any of the above technical solutions, further, the support beam and the outer plate are connected by welding.

[0014] In any of the above technical solutions, further, the sliding block protrudes from the inner plate or is arranged flush with the inner plate.

[0015] In any of the above technical solutions, further, the support beam includes a U-shaped plate and a connecting plate, the number of the connecting plates is two, and they are respectively arranged on both sides of the open end of the U-shaped plate, and the two connecting plates are respectively in contact with the outer plate.

[0016] In any of the above technical solutions, further, the support beams are provided on both sides of the battery module along a direction perpendicular to the expansion direction of the battery cell, and the support beams on either side are equipped with the first fastening member, the guide rail and the slider.

[0017] In any of the above technical solutions, further, the liquid-cooled battery pack also includes a reinforcing beam, which is fixed to the outer plate and arranged between the two supporting beams, with both ends of the reinforcing beam respectively abutting against and connected to the two supporting beams; the inner plate is connected to the reinforcing beam.

[0018] In any of the above technical solutions, further, the liquid-cooled battery pack also includes a fourth fastening member, and the first end plate is detachably connected to the box body through the fourth fastening member.

[0019] In any of the above technical solutions, further, the first end plate is fixedly connected to the bottom wall of the box body.

[0020] In any of the above technical solutions, further, the second end plate is slidably connected to the bottom wall of the box body.

[0021] Compared with the prior art, the beneficial effects of this application are:

[0022] The present application provides a novel liquid-cooled battery pack, in which one end of the battery module is fixed, and the other end of the battery module can move along the expansion direction of the battery cell, thereby reducing the squeezing of the flow channel between the battery cells by the expansion of the battery cell, ensuring the width of the flow channel, and avoiding safety accidents caused by reduced cooling efficiency, thereby improving the safety and reliability of the battery pack, and through the cooperation of the slider and the guide rail, the other end of the battery module can move along the expansion direction of the battery cell, and has a guiding function to avoid displacement, etc.

[0023] In addition, by designing the box wall for mounting the guide rail into a double-layer structure, the bottom of the battery module is raised, ensuring that the other end of the battery module can slide freely to avoid interference, and the structure is reliable. At the same time, the double-layer structure of the box wall also makes the box body deform less when subjected to hydrostatic pressure, and will not affect other structural parts or cause safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of the liquid-cooled battery pack after it is opened according to an embodiment of the present application;

[0026] Figure 2 Another structural schematic diagram of the liquid-cooled battery pack after opening provided in an embodiment of the present application;

[0027] Figure 3 for Figure 2 Schematic diagram of the local structure;

[0028] Figure 4 Another structural schematic diagram of the liquid-cooled battery pack after opening provided in an embodiment of the present application;

[0029] Figure 5 for Figure 4 Cross-sectional view along section AA;

[0030] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B;

[0031] Figure 7 for Figure 5 A schematic diagram of the enlarged structure at C;

[0032] Figure 8 A schematic diagram of the structure of the box provided in the embodiment of the present application;

[0033] Fig. 9 for Figure 8 A schematic diagram of the enlarged structure at D;

[0034] Fig.10 A schematic diagram of the structure of the support beam and the reinforcement beam provided in the embodiment of the present application;

[0035] Fig.11 for Fig.10 A schematic diagram of the enlarged structure at E;

[0036] Fig.12 Another structural schematic diagram of a support beam and a reinforcement beam provided in an embodiment of the present application;

[0037] Fig.13 for Fig.12 A schematic diagram of the enlarged structure at F;

[0038] Fig.14 Assembly diagram of the first fastening member and the slider provided in the embodiment of the present application

[0039] Fig.15 An assembly diagram of a first fastening member, a guide rail, and a slider provided in an embodiment of the present application;

[0040] Fig.16 A schematic diagram of the structure of the box provided in an embodiment of the present application.

[0041] Reference numerals:

[0042] 1-box body, 11-inner plate, 111-first avoidance opening, 12-outer plate, 13-support beam, 131-U-shaped plate, 1311-second avoidance opening, 132-connecting plate, 14-reinforcement beam, 2-battery module, 21-battery cell, 22-first end plate, 23-second end plate, 3-first fastening member, 4-guide rail, 5-slider, 6-fourth fastening member. DETAILED DESCRIPTION

[0043] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0044] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0045] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0046] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] Refer to the following Figures 1 to 16 A liquid-cooled battery pack according to some embodiments of the present application is described.

[0049] See also Figures 1 to 7As shown, an embodiment of the present application provides a liquid-cooled battery pack, comprising: a box body 1 and a battery module 2 arranged in the box body 1; wherein the battery module 2 comprises a battery cell 21, a first end plate 22 and a second end plate 23, the number of the battery cells 21 is multiple, and the multiple battery cells 21 are arranged in sequence along a preset direction, and the battery cells 21 can expand along the preset direction, and the expansion direction specifically refers to a direction perpendicular to the large side of the battery cell 21, and the large side specifically refers to a surface formed by a long side and a high side;

[0050] Along the expansion direction of the battery cell 21, the first end plate 22 and the second end plate 23 are respectively located on the opposite sides of the first battery cell and the last battery cell, that is, the first end plate 22 is located on the side of the first battery cell 21 away from the last battery cell, and the second end plate 23 is located on the side of the last battery cell away from the first battery cell, and the first end plate 22 and the second end plate 23 play a protective role on the battery cell 21;

[0051] The first end plate 22 is fixedly connected to the box body 1 , and the second end plate 23 is slidably connected to the box body 1 , so that the battery cell 21 can move along the expansion direction of the battery cell 21 .

[0052] Based on the structure described above, it can be known that the present application provides a new type of liquid-cooled battery pack, in which one end of the battery module 2 is fixed, and the other end of the battery module 2 can move along the expansion direction of the battery cell 21, thereby reducing the squeezing of the flow channel between the battery cells 21 due to the expansion of the battery cell 21, ensuring the width of the flow channel, avoiding safety accidents caused by reduced cooling efficiency, and thereby improving the safety and reliability of the battery pack.

[0053] Further, preferably, the first end plate 22 is fixedly connected to the bottom wall of the box body 1, and the second end plate 23 is slidably connected to the bottom wall of the box body 1. This will be used as an example in the following text. Since the bottom wall of the box body 1 plays the main role of supporting the battery module 2, the first end plate 22 and the second end plate 23 are connected to the bottom wall of the box body 1, so that the overall structure is more stable, and the space is fully utilized, and it is not easy to interfere with other structures. Of course, it is not limited to this. The first end plate 22 can be fixedly connected to the side wall and / or bottom wall of the box body 1, and the second end plate 23 can be slidably connected to the side wall and / or bottom wall of the box body 1, or the first end plate 22 can be connected to the bottom wall or side wall of the box body 1 at the same time, and the second end plate 23 can be connected to the bottom wall or side wall of the box body 1 at the same time, etc., and the specific selection is based on actual needs.

[0054] Further, preferably, foam is provided between any two adjacent battery cells 21, between the first battery cell and the first end plate 22, and between the last battery cell and the second end plate 23, and the above structures are bonded together in sequence by thermal conductive adhesive to form a whole. This part is the prior art and will not be described in detail here.

[0055] In this embodiment, preferably, Figure 6 , Figures 8 to 16 As shown, the liquid-cooled battery pack also includes a first fastening member 3, a guide rail 4 and a slider 5; wherein the guide rail 4 is fixed to the box wall of the box body 1; the second end plate 23 is connected to the slider 5 through the first fastening member 3, and the slider 5 is slidably connected to the guide rail 4.

[0056] According to the structure described above, the slider 5 slides along the guide rail 4, so that the second end plate 23 can move along the expansion direction of the battery cell 21, and then the battery cell 21 can move along its expansion direction, and then the width of the flow channel between the two battery cells 21 can be adjusted automatically, thereby ensuring the cooling efficiency, and the slider 5 slides along the guide rail 4 more smoothly to avoid jamming.

[0057] Furthermore, preferably, the first fastening member 3 is passed through the second end plate 23, and the first fastening member 3 extends along the height direction of the second end plate 23, the top limit portion of the first fastening member 3 extends above the top of the second end plate 23, and the bottom end of the first fastening member 3 extends below the bottom of the second end plate 23 and is connected to the slider 5, thereby increasing the contact area between the first fastening member 3 and the second end plate 23 and improving the stability and firmness of the assembly of the two.

[0058] Further, preferably, the first fastening member 3 is a screw or a bolt.

[0059] In this embodiment, preferably, Figure 6 and Figure 8 As shown, the box wall of the box body 1 on which the guide rail 4 is installed, such as the bottom wall, is a double-layer structure, and the double-layer structure includes an inner plate 11 and an outer plate 12, and the inner plate 11 and the outer plate 12 are arranged at intervals to form an installation space; at least part of the structure of the guide rail 4 and the slider 5 are arranged in the installation space and fixed to the outer plate 12, and the guide rail 4 is fixed to the outer plate 12; the inner plate 11 is formed with a first avoidance opening 111, and is used to avoid the first fastening member 3.

[0060] According to the structure described above, it can be known that the box wall with the guide rail 4 installed is designed to be a double-layer structure, and a sandwich space, i.e., an installation space, is formed inside, so that structures such as the guide rail 4 and the slider 5 can be installed in this installation space, and the inner wall in contact with the battery module 2 is ensured to have a planar structure, which plays a role in stably supporting the battery module 2 and ensuring that the battery module 2 slides smoothly and smoothly without the problem of jamming. Moreover, the above structure is easier to assemble. That is to say, by designing the box wall with the guide rail 4 installed to be a double-layer structure, the bottom of the battery module 2 is raised, and the other end of the battery module 2 can slide freely to avoid interference, and the structure is reliable. At the same time, the double-layer structure of the box wall also makes the box body 1 less deformed when subjected to hydrostatic pressure, and will not affect other structural parts or cause safety accidents.

[0061] In this embodiment, preferably, Figures 8 to 16 As shown, the liquid-cooled battery pack further includes a support beam 13, which is disposed in the installation space and fixed to the outer plate 12; the support beam 13 is formed with an installation cavity, an opening communicating with the installation cavity, and a second avoidance opening 1311, and the guide rail 4 is disposed in the installation cavity and fixed to the support beam 13, so that the guide rail 4 and the slider 5 can be installed into the installation cavity through the opening, thereby improving assembly efficiency;

[0062] The slider 5 extends into the installation cavity through the second avoidance opening 1311 and is slidably connected to the guide rail 4 . It can be seen that the avoidance opening serves to avoid the slider 5 ; the inner plate 11 is connected to the support beam 13 .

[0063] According to the structure described above, the support beam 13 plays a role in supporting the inner plate 11, and a space for installing the guide rail 4 and the slider 5 is formed inside the support beam 13, which has a higher integration and saves space.

[0064] It should be noted that the liquid-cooled battery pack may not include the support beam 13 , that is, the support beam 13 is removed and the guide rail 4 is directly installed on the outer plate 12 .

[0065] In addition, it is not limited to the above-mentioned "the box wall of the box body 1 installed with the guide rail 4, such as the bottom wall, is a double-layer structure", that is, the box wall of the box body 1 installed with the guide rail 4 can be a single-layer structure, that is, a structure with only the outer panel 12.

[0066] In this embodiment, preferably, the liquid-cooled battery pack further includes a second fastening member (not shown in the figure), and the guide rail 4 is detachably connected to the support beam 13 via the second fastening member.

[0067] According to the structure described above, it can be known that the guide rail 4 and the support beam 13 are connected in a detachable manner, which is convenient for installation and disassembly, and is especially convenient for later maintenance.

[0068] Further, preferably, the second fastening member is a screw or a bolt.

[0069] In this embodiment, preferably, the liquid-cooled battery pack further includes a third fastening member (not shown in the figure), and the inner plate 11 is detachably connected to the support beam 13 via the third fastening member.

[0070] According to the structure described above, it can be known that the inner plate 11 and the support beam 13 are connected in a detachable manner, which is convenient for installation and disassembly, and is especially convenient for later maintenance.

[0071] Further, preferably, the third fastening member is a screw or a bolt.

[0072] In this embodiment, preferably, the support beam 13 is connected to the outer plate 12 by welding. It can be seen that the support beam 13 is connected to the outer plate 12 by welding, and the connection structure is more stable and has higher strength. Of course, it is not limited to this. The support beam 13 and the outer plate 12 can also be connected by bolts or screws, which is specifically designed according to actual needs.

[0073] In this embodiment, preferably, Figures 1 to 3 As shown, the slider 5 protrudes from the inner plate 11, that is, the slider 5 sequentially extends to the upper side of the inner plate 11 through the second avoidance opening 1311 and the first avoidance opening 111, so that the bottom of the second end plate 23 is slightly higher than the inner plate 11, thus avoiding interference and stagnation, and making it easier for the second end plate 23 to slide. Of course, the slider 5 is not limited to this, and can also be set flush with the inner plate 11, which is specifically designed according to actual needs.

[0074] In this embodiment, preferably, Fig.10 and Fig.16 As shown, the support beam 13 includes a U-shaped plate 131 and a connecting plate 132 . There are two connecting plates 132 , which are respectively arranged on both sides of the opening end of the U-shaped plate 131 . The two connecting plates 132 are respectively in contact with the outer plate 12 .

[0075] According to the structure described above, the two connecting plates 132 can be connected to the outer plate 12 by welding, and the contact area is increased, thereby improving the stability and firmness of the connection; the interior of the U-shaped plate 131 forms the aforementioned installation cavity, and its top can also cooperate with the inner plate 11 to support the inner plate 11.

[0076] Further, preferably, the support beam 13 is an integrated sheet metal component, but is not limited thereto and may also be other structural components.

[0077] In this embodiment, preferably, Fig.10 and Fig.16 As shown, support beams 13 are provided on both sides of the battery module 2 along the direction perpendicular to the expansion direction of the battery cell 21, and the support beams 13 on either side are equipped with a first fastening member 3, a guide rail 4 and a slider 5, that is, the number of the support beams 13 is two, and they are arranged in sequence and at intervals along the expansion direction perpendicular to the battery cell 21; the number of the first fastening member 3, the guide rail 4 and the slider 5 are two, and they correspond one to one to the two support beams 13. It should be noted here that each support beam 13 can be assembled from multiple short beams, such as welded, or it can be an integrated structure, which can be selected according to actual needs.

[0078] According to the structure described above, two sets of sliding guide structures are designed, each set of sliding guide structures includes a support beam 13, a first fastening member 3, a guide rail 4 and a slider 5, so that the second end plate 23 is more stable during sliding. Of course, it is not limited to this, and one set of sliding guide structures or more than two sliding guide structures, such as three sliding guide structures or four sliding guide structures, can also be designed.

[0079] In this embodiment, preferably, Fig.10 and Fig.16 As shown, the liquid-cooled battery pack further includes a reinforcing beam 14 , which is fixed to the outer plate 12 , and is disposed between the two supporting beams 13 , and both ends of the reinforcing beam 14 are respectively against and connected to the two supporting beams 13 .

[0080] According to the structure described above, it can be known that the reinforcing beam 14 connects the two supporting beams 13 together, thereby further improving the strength.

[0081] Further, preferably, the reinforcing beam 14 and the outer plate 12 can be connected by welding. Of course, it is not limited to this, and they can also be connected by bolts or screws.

[0082] Further, preferably, the reinforcing beam 14 and the supporting beam 13 are connected by welding.

[0083] Further, preferably, the inner plate 11 is connected to the reinforcing beam 14, and preferably, they can be connected by screws or bolts.

[0084] Further, preferably, the structure of the reinforcing beam 14 can refer to the supporting beam 13, which also includes a U-shaped plate 131 and a connecting plate 132, and the specific structure will not be described in detail.

[0085] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the liquid-cooled battery pack further includes a fourth fastening member 6 , and the first end plate 22 is fixedly and detachably connected to the box body 1 via the fourth fastening member 6 .

[0086] According to the structure described above, it can be known that the first end plate 22 and the box body 1 are connected in a detachable manner, which is convenient for installation and disassembly, and is especially convenient for later maintenance.

[0087] Further, preferably, the fourth fastening member 6 is a screw or a bolt.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid-cooled battery pack, characterized in that: include: A box body and a battery module disposed in the box body; wherein the battery module comprises a battery cell, a first end plate and a second end plate, the number of the battery cells is multiple, and the multiple battery cells are sequentially arranged along a preset direction, and the battery cells can expand along the preset direction; Along the expansion direction of the battery cell, the first end plate and the second end plate are respectively located on the opposite sides of the first battery cell and the last battery cell, and the first end plate is fixedly connected to the box body, and the second end plate is slidably connected to the box body, so that the battery cell can move along the expansion direction of the battery cell.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid-cooled battery pack also includes a first fastening member, a guide rail and a slider; wherein the guide rail is fixed to the box wall of the box body; the second end plate is connected to the slider through the first fastening member, and the slider is slidably connected to the guide rail.

3. The liquid-cooled battery pack according to claim 2, characterized in that: The box wall of the box body on which the guide rail is installed is a double-layer structure, the double-layer structure includes an inner plate and an outer plate, and the inner plate and the outer plate are arranged at intervals to form an installation space; The guide rail and at least a part of the structure of the slider are both arranged in the installation space, and the guide rail is fixed to the outer plate; the inner plate is formed with a first avoidance opening for avoiding the first fastening member.

4. The liquid-cooled battery pack according to claim 3, characterized in that: The liquid-cooled battery pack further includes a support beam, which is disposed in the installation space and fixed to the outer plate; the support beam is formed with an installation cavity, an opening communicating with the installation cavity, and a second avoidance opening, and the guide rail is disposed in the installation cavity and fixed to the support beam; The sliding block extends into the installation cavity through the second avoidance opening and is slidably connected to the guide rail; the inner plate is connected to the support beam.

5. The liquid-cooled battery pack according to claim 4, characterized in that: The liquid-cooled battery pack further includes a second fastening member, and the guide rail is detachably connected to the support beam via the second fastening member; and / or The liquid-cooled battery pack further includes a third fastening member, and the inner plate is detachably connected to the support beam via the third fastening member; and / or The support beam is connected to the outer plate by welding; and / or The sliding block protrudes from the inner plate or is arranged flush with the inner plate; and / or The support beam includes a U-shaped plate and a connecting plate. There are two connecting plates, which are respectively arranged on both sides of the opening end of the U-shaped plate. The two connecting plates are respectively fitted with the outer plate.

6. The liquid-cooled battery pack according to claim 4, characterized in that: The support beams are disposed on both sides of the battery module along a direction perpendicular to the expansion direction of the battery core, and the support beams on either side are equipped with the first fastening member, the guide rail and the slider.

7. The liquid-cooled battery pack according to claim 6, characterized in that: The liquid-cooled battery pack also includes a reinforcing beam, which is fixed to the outer plate and arranged between the two supporting beams. The two ends of the reinforcing beam respectively abut against and are connected to the two supporting beams; the inner plate is connected to the reinforcing beam.

8. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid-cooled battery pack further includes a fourth fastening member, and the first end plate is detachably connected to the box body via the fourth fastening member.

9. The liquid-cooled battery pack according to claim 1, characterized in that: The first end plate is fixedly connected to the bottom wall of the box body.

10. The liquid-cooled battery pack according to any one of claims 1 to 9, characterized in that: The second end plate is slidably connected to the bottom wall of the box body.

Images