Battery pack lower shell structure and battery pack

Abstract

The utility model provides a battery pack lower shell structure and a battery pack. The lower shell structure of the battery pack comprises a frame, a cross beam and a longitudinal beam, the frame is constructed into a closed ring shape formed by fixedly connecting a plurality of unit pieces end to end; the frame is constructed to be in a plate shape formed by stacking the multiple unit pieces in the height direction, the frame is fixedly connected to the inner side of the frame in the width direction of the frame, and the multiple frame bodies are distributed in the length direction of the frame at equal intervals. The longitudinal beams are constructed to be in a plate shape formed by stacking the multiple unit pieces in the height direction, fixedly connected to the inner side of the frame in the length direction of the frame and distributed at equal intervals in the length direction of the frame. Each unit piece is constructed to be a hollow profile steel which is formed by continuously bending a single rolling steel plate and has a cross section shaped like a Chinese character'ri '. The utility model has the advantages of high structural strength, good bearing capacity and lower manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a lower shell structure of a battery pack. The utility model also relates to a battery pack comprising the above-mentioned lower shell structure of the battery pack. Background Art

[0002] New energy vehicles refer to advanced structural vehicles that use unconventional automotive fuels (gasoline) as a power source and are equipped with new on-board power devices. As the energy storage and functional structure of new energy vehicles, battery packs will directly affect the range, power performance, safety performance and service life of new energy vehicles, and are the key to technological breakthroughs in new energy vehicles. In order to make new energy vehicles have better power performance and longer range, the size of battery packs is designed to be larger and larger with the iteration of technology to accommodate as many battery cells as possible. The increase in battery pack size, the increase in the number of battery cells, and the increase in the grouping rate of battery cells have all put forward higher requirements on the strength and carrying capacity of the battery pack shell.

[0003] At present, the common practice in the industry is to use an integrally stamped liquid cooling plate directly as the lower shell of the battery pack. First of all, the mold opening cost of the mold used in the integral stamping process is relatively high, and the 3 series aluminum-manganese alloy material used in the liquid cooling plate itself is also relatively expensive. The cost of the liquid cooling plate made by the integral stamping process is difficult to control, which in turn affects the overall cost of the battery pack. Secondly, the structural strength of the integrally formed aluminum plate will decrease as the size of the battery pack increases, making it difficult to meet the mechanical performance requirements of the national standard GB / T 36276-2023 for the battery pack.

[0004] In the prior art, there are related literature reports on a steel-aluminum hybrid battery pack shell structure, which achieves the purpose of improving the structural strength of the battery pack shell by adding a steel crossbeam on the basis of the original aluminum plate lower shell. However, this structure also has the disadvantages of high cost and difficult cost control. Utility Model Content

[0005] In view of this, the utility model aims to propose a battery pack lower shell structure that can meet the structural strength requirements of a large-size battery pack for a battery pack shell and has a relatively low cost so as to control the overall cost of the battery pack.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] The utility model provides a battery pack lower shell structure, comprising:

[0008] The frame is constructed as a closed ring formed by a plurality of unit elements being fixed end to end;

[0009] The cross beams are configured as plate-shaped structures formed by stacking a plurality of the unit members in the height direction, fixedly connected to the inner side of the frame along the width direction of the frame, and are provided as a plurality of equally spaced along the length direction of the frame;

[0010] The longitudinal beams are configured as plate-shaped structures formed by stacking a plurality of the unit members in the height direction, fixedly connected to the inner side of the frame along the length direction of the frame, and are provided as a plurality of equally spaced along the length direction of the frame;

[0011] The unit member is configured as a hollow section steel with a "day" - shaped cross-section formed by continuously bending a single piece of rolled steel plate.

[0012] Furthermore, a limiting notch is provided in the middle of the cross beam, and at least part of the cross beam is coplanar with the upper surface of the longitudinal beam due to the provision of the limiting notch.

[0013] Furthermore, a connecting member is fixedly provided on the top of the cross beam, and a plurality of mounting holes are provided on the connecting member and are evenly distributed along its own length direction.

[0014] Compared with the prior art, the present utility model has the following advantages:

[0015] For the battery pack lower housing structure and the battery pack of the present utility model, the frame cooperates with the cross beams and longitudinal beams fixedly arranged on the frame to form a lower housing structure with relatively high structural strength and good load-bearing capacity, which plays a role in supporting and position-fixing the battery modules mounted on the lower housing. The frame and the main structures such as the cross beams and longitudinal beams all adopt plate-shaped structures formed by connecting the unit members end to end or stacking them in the height direction. While ensuring strength and load-bearing capacity, the materials and processing costs of the unit members formed by continuously bending a single piece of rolled steel plate are relatively low. Compared with the process of using integrally stamped aluminum plates as the battery pack lower housing, the overall manufacturing cost of the battery pack is significantly reduced. By setting the cross-section of the unit member as a "day" - shaped hollow section steel with transverse ribs, the structural strength and load-bearing capacity of the unit member can be further improved.

[0016] Secondly, by providing a limiting notch on the cross beam, better fixing and limiting of the battery modules can be achieved, reducing the relative shaking between the battery modules and the battery pack lower housing. The connecting member fixedly connected to the top of the cross beam can be used for limiting the position of the cross beam, and the mounting holes provided on the connecting member can be used for installing bolts to fix the cross beam on the vehicle frame. The introduction of the connecting member ensures the structural integrity of the cross beam, improving the structural strength and load-bearing capacity of the cross beam.

[0017] In addition, the present utility model also proposes a battery pack, including:

[0018] A lower housing, adopting the battery pack lower housing structure as described above;

[0019] A battery module is fixed on the lower housing;

[0020] A cooling assembly, fixedly mounted on the lower housing;

[0021] An upper shell, a cover buckled on the lower shell;

[0022] The bottom plate is fixed to the bottom of the lower shell and is used to cooperate with the upper shell to form a cover for the battery module and the cooling assembly.

[0023] Furthermore, the battery module comprises:

[0024] The battery cells are arranged in a plurality of equal spacings along the thickness direction of the battery cells;

[0025] An integrated busbar, which is arranged to be two symmetrically distributed about the length direction of the battery cell and electrically connected to the battery cell;

[0026] Covering members, which are arranged to be fixed to the integrated busbar and form an insulating shield for the integrated busbar;

[0027] A busbar is electrically connected to the battery core and extends from one side of the upper shell to the outside.

[0028] Furthermore, the cooling assembly comprises:

[0029] An upper cold plate, which is formed by buckling an upper flow channel plate and an upper flat plate, and is fixed on the top of the battery cell;

[0030] A lower cold plate, which is formed by buckling a lower flow channel plate and a lower flat plate, and is fixedly arranged at the bottom of the battery cell;

[0031] The liquid cooling pipe is communicated with the upper cold plate and the lower cold plate, and extends from a side of the upper shell away from the bus bar to the outside.

[0032] Furthermore, the flow channel cavity of the upper flow channel plate is the same as that of the lower flow channel plate.

[0033] Furthermore, an inspection window is provided on the upper shell, and the inspection window is located between the bus and the liquid cooling pipe.

[0034] Furthermore, heat-conductive structural adhesive is filled between the battery core and the upper cold plate and the lower cold plate.

[0035] Furthermore, the bottom plate includes:

[0036] A support seat, fixedly mounted on the bottom of the lower shell;

[0037] The heat preservation plate is fixed on the support seat.

[0038] The lower shell used in the battery pack described in the present invention has the same beneficial effects as the battery pack lower shell structure described above relative to the prior art, and will not be described in detail here.

[0039] The battery pack described in the utility model also includes a battery module, a cooling assembly, an upper shell and a bottom plate. Among them, the battery module is a collection of battery cells that integrates charge and discharge management, and realizes the basic functions of the battery pack to store and provide electric energy; the cooling assembly can maintain the operating temperature of the battery module within an appropriate range by liquid cooling, ensuring the service life and electrical safety of the battery cell, and the upper shell and the bottom plate cooperate with the lower shell to cover the outside of the battery module and the cooling assembly, which plays a role in limiting the installation of the battery module and the cooling assembly, and plays a protective role for the battery module. In addition to being a part of the battery pack shell, the bottom plate also plays a role in isolating heat.

[0040] Secondly, the battery module includes battery cells, integrated busbars, covers and busbars. The battery cells are the smallest basic units for storing and providing electric energy. By arranging the battery cells in an equal-gap manner, the extrusion problem caused by the heat expansion of the battery cells can be alleviated to a certain extent, which is beneficial to increase the number of charge and discharge cycles and service life of the battery cells. The integrated busbar is installed on both sides of the battery cell, which plays the role of charge and discharge management, state detection and on-off control for the battery cell. The cover installed on the integrated busbar plays an insulating role for the integrated busbar. The busbar is connected to multiple battery cells, realizing the series or parallel connection between the battery module cells, and at the same time extends to the outside of the upper shell, acting as a terminal to input or output electric energy.

[0041] Again, the cooling assembly includes an upper cold plate and a lower cold plate distributed at the top and bottom of the battery cell, and a liquid cooling tube connected to the flow channel cavity of the upper cold plate and the lower cold plate. The liquid cooling tube, the upper cold plate and the lower cold plate together form a passage for the circulation of the coolant. By setting the position where the liquid cooling tube extends to the outside on the side away from the bus, the effect of separating water and electricity and improving the electrical safety of the battery pack can be achieved. By setting the flow channel cavity of the upper cold plate and the lower cold plate to the same shape, the cost of mold opening for cold plate stamping processing can be reduced. By filling the upper and lower cold plates with thermal conductive structural glue and the battery cell, the stability of the connection structure between the battery cell and the upper and lower cold plates can be maintained without significantly affecting the heat exchange efficiency, thereby preventing the battery cell from being misaligned with the upper and lower cold plates due to long-term use.

[0042] In addition, the bottom plate includes a support seat and an insulation plate. The main body is composed of a support seat made of welded steel sections, which ensures the structural strength of the bottom plate. The insulation plate can improve the heat insulation capacity of the bottom plate and reduce the conduction of ambient heat into the battery pack. By opening an inspection window on the upper shell, the inspection process of the battery pack can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0044] Figure 1 This is a schematic diagram of the structure of the lower shell of the battery pack in the embodiment of the present application;

[0045] Figure 2 This is a schematic diagram of the structure of a unit element in an embodiment of the present application;

[0046] Figure 3 This is a schematic diagram of the structure of the crossbeam in the embodiment of the present application;

[0047] Figure 4 This is a schematic diagram of the explosion structure of the battery pack in the embodiment of the present application;

[0048] Figure 5 This is a schematic diagram of the explosion structure of the battery module in the embodiment of the present application;

[0049] Figure 6 This is a schematic diagram of the structure of the upper cold plate in the embodiment of the present application;

[0050] Figure 7 This is a schematic diagram of the structure of the lower cold plate in the embodiment of the present application;

[0051] Figure 8 Schematic diagram of the structure of the base plate in the embodiment of the present application.

[0052] Description of reference numerals:

[0053] 1. Single element; 2. Frame;

[0054] 3. Beam;

[0055] 301, limiting notch; 302, connecting piece; 303, mounting hole;

[0056] 4. Stringer;

[0057] 5. Battery module;

[0058] 501, battery cell; 502, integrated busbar; 503, cover; 504, busbar;

[0059] 6. Cooling components;

[0060] 601, upper cold plate; 602, lower cold plate; 603, liquid cooling pipe;

[0061] 6011, upper flow channel plate; 6012, upper flat plate;

[0062] 6021, lower flow channel plate; 6022, lower flat plate;

[0063] 7. Upper shell;

[0064] 701, inspection window;

[0065] 8. Bottom plate;

[0066] 801. Support base; 802. Insulation board. DETAILED DESCRIPTION

[0067] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0068] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0069] Taking a battery pack lower shell structure and a battery pack described in the present invention as an example, the directional words used in the embodiments, such as "up, down, left, right, front, and back", are defined based on the up and down direction (also known as the height direction, or the Z direction of the battery pack), the left and right direction (also known as the width direction, or the Y direction of the battery pack), and the front and back direction (also known as the length direction, or the X direction of the battery pack). "Inside and outside" are defined based on the contour of the corresponding parts. For example, "inside" and "outside" are defined based on the contour of the battery pack, and the side of the battery pack contour close to the middle of the battery pack is "inside", and the opposite is "outside".

[0070] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 an indirect connection 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 the present invention can be understood in combination with specific circumstances.

[0071] The following will refer to the attached Figures 1 to 8 The utility model is described in detail in conjunction with the embodiments.

[0072] Embodiment 1

[0073] The present embodiment relates to a lower shell structure of a battery pack, which adopts a steel unit formed by continuous bending of a single rolled steel plate to form the main body of the lower shell structure by superimposing and welding, thereby replacing the one-piece formed aluminum alloy plate in the prior art, thereby achieving the purpose of the invention of improving the structural strength and bearing capacity of the lower shell of the battery pack and reducing the production cost of the battery pack shell.

[0074] In terms of overall structure, refer to Figure 1 , Figure 2 and Figure 3 The lower shell structure of the battery pack of this embodiment includes a frame 2, a crossbeam 3 and a longitudinal beam 4. Among them, the frame 2 can be a closed annular rectangular frame formed by connecting multiple units 1 end to end by welding. The crossbeam 3 and the longitudinal beam 4 are fixedly welded inside the frame in a cross-cross manner, and the crossbeam 3 and the longitudinal beam 4 are both plate-like structures composed of unit units 1 stacked and welded along the height direction of the battery pack. The unit unit 1 is a tubular steel formed by continuous bending of a single piece of rolled steel plate. The cross-sectional shape of the unit unit 1 is in the shape of a "sun". The crossbeam 3 and the longitudinal beam 4 are both arranged in multiple uniformly along the length direction of the frame 2.

[0075] As configured above, the battery pack lower shell structure composed of the tubular steel structure unit elements 1 welded together can maintain good overall strength and bending resistance when the size of the battery pack shell increases, compared with the one-piece aluminum plate. In addition, since the material cost of the tubular steel is lower than that of the aluminum plate, the use of the above structure can significantly reduce the production cost of the battery pack lower shell.

[0076] Based on the above design concept, specifically, in this embodiment, refer to Figure 1 and Figure 2, unit element 1 is a tubular steel section formed by continuous bending of a single piece of rolled steel plate. The length of unit element 1 can be selected to different values ​​according to actual needs. The cross-sectional shape of unit element 1 is a "sun" shape formed by uninterrupted extension along a single path. The starting edge and the end edge of the single piece of rolled steel plate constituting unit element 1 are welded to the side of the unit element 1 body to form a closed figure. Bolt holes can be opened on unit element 1 along its own height direction to facilitate fixing its own position by installing blind rivets. The bolt holes can be set to a plurality of equally spaced distributions along its own length direction according to actual needs.

[0077] Reference Figure 1 , Figure 2 and Figure 3 In order to improve the structural strength and reduce the production cost, in this embodiment, the frame 2 can be a single-layer rectangular frame composed of four unit elements 1 connected end to end and welded. It should be noted that the height of the frame 2 can be adaptively adjusted according to the actual size of the internal structure, and it can be a multi-layer structure similar to the cross beam 3 and the longitudinal beam 4, and is not limited to a single-layer frame composed of a single-layer unit element 1.

[0078] Reference Figure 1 , Figure 2 and Figure 3 In order to further improve the support stability of the internal structure of the battery pack, in this embodiment, a limiting notch 301 is provided in the middle of the crossbeam 3. The limiting notch 301 plays a limiting role in the structure inside the battery pack. At least part of the upper surface of the crossbeam 3 is coplanar with the upper surface of the longitudinal beam 4 due to the opening of the limiting notch 301. By setting the upper surface of the longitudinal beam 4 and part of the upper surface of the crossbeam 3 to a coplanar structure, the stability of the crossbeam 3 and the longitudinal beam 4 in supporting the internal structure of the battery pack can be improved. A connector 302 is also provided on the top of the crossbeam 3. The connector 302 can be a tubular steel with a "mouth"-shaped cross section. A mounting hole 303 is provided on the upper surface of the connector 302. The mounting hole 303 can be set as a circular through hole opened along the height direction of the connector 302. The mounting holes 303 are set to be a plurality of equidistantly distributed along the length direction of the connector 302. By providing an independent connecting piece 302 on the cross beam 3 , it is possible to avoid the installation hole 303 being directly opened on the cross beam 3 , thereby ensuring the structural strength of the cross beam 3 itself.

[0079] Reference Figure 1 , Figure 2 and Figure 3The longitudinal beam 4 is also a plate-like structure composed of multiple units 1 stacked and welded along the height direction of the battery pack. The longitudinal beam 4 is vertically welded between the cross beam 3 and the frame 2. The longitudinal beam 4 is arranged to be evenly distributed along the length direction of the frame 2. The upper surface of the longitudinal beam 4 is coplanar with the upper surface of the portion of the cross beam 3 where the limiting notch 301 is opened, thereby forming a planar support structure with better support stability.

[0080] Embodiment 2

[0081] The present embodiment relates to a battery pack, including the battery pack lower shell structure as described in the first embodiment. In addition, it also includes a battery module 5, a cooling assembly 6, an upper shell 7 and a bottom plate 8. The bottom plate 8 is installed at the bottom of the lower shell, and the upper shell 7 is buckled on the top of the lower shell, forming a cavity for accommodating and fixing the battery module 5 and the cooling assembly 6 with the lower shell and the bottom plate 8. The battery module 5 realizes the basic functions of charging and discharging the battery pack. The cooling assembly 6 can cooperate with the upper shell 7, the lower shell and the bottom plate 8 to keep the battery module 5 in position, and at the same time can keep the operating temperature of the battery module 5 within a certain range, thereby ensuring the number of charge and discharge cycles and the service life of the battery module 5.

[0082] Based on the above design concept, specifically, in this embodiment, refer to Figure 4 and Figure 5 , the battery module 5 includes a battery cell 501, an integrated busbar 502, a cover 503 and a busbar 504. Among them, the battery cell 501 is in the shape of a rectangular plate. The battery cells 501 are arranged with the same gap along their thickness direction. The gap between the battery cells 501 reserves space for the high-temperature expansion of the battery cells 501 that may occur during subsequent use, reduces the expansion force of the battery cells 501 at the end of the cycle, and increases the number of charge and discharge cycles and service life of the battery cells 501. The integrated busbar 502 is set to be symmetrically distributed at the length end of the battery cell 501, and is electrically connected to the battery cell 501 by laser welding. The integrated busbar 502 is integrated with a chip with charge and discharge management, temperature or other physical state monitoring and control functions, which can control the charge and discharge of the battery cell 501. The cover 503 is set to be symmetrically distributed at the length end of the battery cell 501, and is fixedly connected to the integrated busbar 502 by gluing, forming an insulating shielding for the integrated busbar 502. The cells 501 are connected in series or in parallel via busbars 504. The busbars 504 are disposed on the upper housing 7 and extend from one side of the upper housing 7 to the outside of the upper housing 7 for electrical connection with the outside to perform charging or discharging.

[0083] Reference Figure 4 , Figure 6 and Figure 7The cooling assembly 6 includes an upper cold plate 601, a lower cold plate 602 and a liquid cooling pipe 603. Among them, the upper cold plate 601 is fixedly installed on the top of the battery module 5, the lower cold plate 602 is installed on the bottom of the battery module 5, and the liquid cooling pipe 603 is connected to the upper cold plate 601 and the lower cold plate 602 respectively, forming a channel for the circulation of the coolant. The liquid cooling pipe 603 is passed through the upper shell 7 and extends from the side of the upper shell 7 away from the bus 504 to the outside of the upper shell 7. By adopting the above arrangement, a water-electricity separation structure can be formed, which further improves the electrical safety of the battery pack in this application.

[0084] Specifically, refer to Figure 6 and Figure 7 The upper cold plate 601 includes an upper flow channel plate 6011 and an upper flat plate 6012. The upper flow channel plate 6011 is processed with a flow channel cavity for the flow of coolant by means of stamping and integrated molding. The upper flat plate 6012 is brazed and buckled on the upper flow channel plate 6011, forming a closure and blockage of the flow channel cavity. The lower cold plate 602 includes a lower flow channel plate 6021 and a lower flat plate 6022. The lower flow channel plate 6021 is processed with a flow channel cavity for the flow of coolant by means of stamping and integrated molding. The lower flat plate 6022 is brazed and buckled on the lower flow channel plate 6021, forming a closure and blockage of the flow channel cavity. In order to further reduce the production cost, the shape and distribution form of the flow channel cavity of the upper flow channel plate 6011 and the lower flow channel plate 6021 are the same, and the same molding mold can be shared, thereby eliminating the mold costs generated by separately opening the molds for the processing of the upper flow channel plate 6011 and the lower flow channel plate 6021.

[0085] Reference Figure 4 and Figure 5 For the purpose of simplifying the maintenance process, the upper shell 7 is provided with a maintenance window 701, which is provided between the bus bar 504 and the liquid cooling tube 603. The maintenance window 701 can be a rectangular through hole provided on the side wall of the upper shell 7.

[0086] Reference Figure 4 and Figure 8 In order to reduce the transfer of ambient heat to the inside of the battery pack, the bottom plate 8 includes a support seat 801 and a heat preservation plate 802. The support seat 801 is a rectangular frame formed by welding tubular steel. The support seat 801 is installed on the bottom of the lower shell by blind rivets. The heat preservation plate 802 is fixed to the support seat 801, and the heat preservation plate 802 can be a rectangular plate structure formed by pressing heat preservation cotton.

[0087] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A battery pack lower shell structure, characterized in that: Comprising: A frame, constructed as a closed ring formed by connecting multiple unit components end to end; Crossbeams, constructed as plate-shaped structures formed by stacking multiple of the unit components in the height direction, fixedly connected to the inner side of the frame along the width direction of the frame, and arranged as multiple crossbeams equally spaced along the length direction of the frame; Longitudinal beams, constructed as plate-shaped structures formed by stacking multiple of the unit components in the height direction, fixedly connected to the inner side of the frame along the length direction of the frame, and arranged as multiple longitudinal beams equally spaced along the length direction of the frame; The unit component is constructed as a hollow section steel with a "day" - shaped cross-section formed by continuously bending a single piece of rolled steel plate.

2. The battery pack lower housing structure according to claim 1, wherein: A limiting notch is formed in the middle of the crossbeam, and at least part of the crossbeam is coplanar with the upper surface of the longitudinal beam due to the formation of the limiting notch.

3. The battery pack lower housing structure according to claim 1 or 2, wherein: A connecting member is fixedly provided on the top of the crossbeam, and a plurality of mounting holes are formed in the connecting member and evenly distributed along its own length direction.

4. A battery pack, characterized in that: Comprising: A lower housing, adopting the battery pack lower housing structure according to any one of claims 1 to 3; A battery module, fixedly provided on the lower housing; A cooling component, fixedly provided on the lower housing; An upper housing, covering the lower housing; A bottom plate, fixed to the bottom of the lower housing, for cooperating with the upper housing to form a covering for the battery module and the cooling component.

5. The battery pack according to claim 4, characterized in that: The battery module includes: Electric cores, arranged as multiple electric cores equally spaced along their own thickness directions; Integrated busbars, arranged as two busbars symmetrically distributed with respect to the length direction of the electric cores and electrically connected to the electric cores; Covering members, arranged as two covering members fixedly connected to the integrated busbars and forming an insulating shield for the integrated busbars; A busbar, electrically connected to the electric cores and extending from one side of the upper housing to the outside.

6. The battery pack according to claim 5, characterized in that: The cooling component includes: An upper cold plate, formed by buckling an upper flow channel plate and an upper flat plate, fixedly provided on the top of the electric cores; A lower cold plate, formed by buckling a lower flow channel plate and a lower flat plate, fixedly provided on the bottom of the electric cores; A liquid cooling pipe, communicating with the upper cold plate and the lower cold plate and extending from one side of the upper housing away from the busbar to the outside.

7. The battery pack according to claim 6, wherein: The flow channel cavities of the upper flow channel plate and the lower flow channel plate are the same.

8. The battery pack according to claim 6, wherein: An inspection window is formed in the upper housing, and the inspection window is located between the busbar and the liquid cooling pipe.

9. The battery pack according to claim 6, wherein: Thermal conductive structural adhesive is filled between the electric cores and both the upper cold plate and the lower cold plate.

10. The battery pack according to claim 4, characterized in that: The bottom plate includes: Support seats, fixedly provided on the bottom of the lower housing; Thermal insulation plates, fixedly provided on the support seats.

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