Housing, battery pack and electric vehicle

Abstract

The present application relates to the technical field of batteries. Disclosed are a housing, a battery pack and an electric vehicle. The housing comprises an upper cover and a lower cover, wherein the upper cover comprises an upper cover left portion and an upper cover right portion which are separately arranged, the upper cover left portion comprising a first top portion, an upper left side portion, a first upper front side portion and a first upper rear side portion, and the upper cover right portion comprising a second top portion, an upper right side portion, a second upper front side portion and a second upper rear side portion; the lower cover comprises a lower cover left portion and a lower cover right portion which are separately arranged, the lower cover left portion comprising a first bottom portion, a lower left side portion, a first lower front side portion and a first lower rear side portion, and the lower cover right portion comprising a second bottom portion, a lower right side portion, a second lower front side portion and a second lower rear side portion; and the upper cover left portion is connected to the upper cover right portion by means of an upper connecting structure, the upper cover left portion is connected to the upper cover right portion by means of a lower connecting structure, and the upper connecting structure and the lower connecting structure are adjustable in size in the left-right direction.

Description

Shell, battery pack and electric vehicle

[0001] This application claims priority to Chinese Patent Application No. 202410894100.7, filed on July 4, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a shell, a battery pack and an electric vehicle. BACKGROUND

[0003] In the related art, once the boundary of a battery pack is determined, it cannot be changed. If a new boundary is to be developed, it needs to be redeveloped, and the tooling mold cannot be shared. In particular, the battery pack of a large-capacity vehicle model cannot be applied to a small-capacity vehicle model. For example, a battery pack of a pure electric vehicle with a cruising range of 600 km is used in a pure electric vehicle with a cruising range of 300 km, which will cause a large waste of battery pack space. Conversely, it cannot meet the power demand. Therefore, in the existing battery system development process, if the power demand of two vehicle models differs greatly, a new battery system will be developed, which causes serious waste of resources and increases additional development costs. TECHNICAL PROBLEM

[0004] The main purpose of the present application is to provide a shell, a battery pack and an electric vehicle, which can adapt to different battery pack boundaries and be applied to vehicle models with different power demands, and the tooling mold can be shared, greatly reducing the development cost and cycle. TECHNICAL SOLUTION

[0005] To achieve the above purpose, the shell provided by the present application is used for a battery pack, and the shell comprises:

[0006] an upper cover comprising a left part and a right part arranged separately, the left part of the upper cover comprising a first top part, an upper left side part connected to the left side of the first top part, and a first upper front side part and a first upper rear side part connected to the front side and the rear side of the first top part, respectively, and the right part of the upper cover comprising a second top part, an upper right side part connected to the right side of the second top part, and a second upper front side part and a second upper rear side part connected to the front side and the rear side of the second top part, respectively; and

[0007] A lower cover is arranged separately from the upper cover and connected in the up-down direction, the lower cover comprising a lower cover left part and a lower cover right part, the lower cover left part comprising a first bottom, a lower left side part connected to the left side of the first bottom, and a first lower front side part and a first lower rear side part connected to the front side and the rear side of the first bottom respectively, the lower cover right part comprising a second bottom, a lower right side part connected to the right side of the second bottom, and a second lower front side part and a second lower rear side part connected to the front side and the rear side of the second bottom respectively;

[0008] The upper cover left part and the upper cover right part are connected through an upper connecting structure, and the lower cover left part and the lower cover right part are connected through a lower connecting structure, the upper connecting structure and the lower connecting structure being adjustable in the left-right direction.

[0009] In an embodiment, the upper connecting structure comprises an upper cover middle part, the upper cover left part and the upper cover right part being connected through the upper cover middle part, the upper cover middle part comprising a third top, and a third upper front side part and a third upper rear side part connected to the front side and the rear side of the third top respectively.

[0010] The lower connecting structure comprises a lower cover middle part, the lower cover left part and the lower cover right part being connected through the lower cover middle part, the lower cover middle part comprising a third bottom, and a third lower front side part and a third lower rear side part connected to the front side and the rear side of the third bottom respectively.

[0011] In an embodiment, the upper cover left part, the upper cover middle part, and the upper cover right part are all formed by stamping a steel plate; and / or,

[0012] The lower cover left part, the lower cover middle part, and the lower cover right part are all formed by stamping a steel plate.

[0013] In an embodiment, the left end and the right end of the third upper front side part are respectively overlapped and welded with the first upper front side part and the second upper front side part, and the left end and the right end of the third upper rear side part are respectively overlapped and welded with the first upper rear side part and the second upper rear side part; and / or,

[0014] The left end and the right end of the third lower front side part are respectively overlapped and welded with the first lower front side part and the second lower front side part, and the left end and the right end of the third lower rear side part are respectively overlapped and welded with the first lower rear side part and the second lower rear side part.

[0015] The application also provides a battery pack comprising the shell and a battery cell arranged in the shell.

[0016] In an embodiment, the battery pack further comprises a cooling system, the cooling system comprising a cooling pipeline arranged between the battery cell and the lower cover, the cooling pipeline comprising:

[0017] The inlet and outlet liquid part includes an inlet pipe and an outlet pipe, the inlet pipe is provided with an inlet port connected with a cooling liquid source and a communication port, the outlet pipe is provided with a discharge port for discharging cooling liquid and a docking port; and

[0018] The flow channel part is provided separately from the inlet and outlet liquid part, and includes a liquid cooling pipe for heat exchange with the battery cell, the liquid cooling pipe is provided with a liquid flow inlet and a liquid flow outlet, the liquid flow inlet is communicated with the communication port, and the liquid flow outlet is communicated with the docking port.

[0019] In an embodiment, the flow channel part includes two liquid cooling pipes, the two liquid cooling pipes include a first liquid cooling pipe and a second liquid cooling pipe, the inlet pipe is correspondingly provided with two communication ports, the two communication ports include a first communication port and a second communication port, the outlet pipe is correspondingly provided with two docking ports, the two docking ports include a first docking port and a second docking port, the inlet pipe and the outlet pipe are arranged in parallel, in the extension direction of the inlet pipe, the first communication port is arranged adjacent to the second docking port, and the second communication port is arranged adjacent to the first docking port, so that the flow directions of the cooling liquid in the first liquid cooling pipe and the second liquid cooling pipe are opposite.

[0020] In an embodiment, the flow channel part is provided in plurality, the plurality of flow channel parts are distributed along the extension direction of the inlet pipe, the inlet pipe is correspondingly provided with a plurality of first communication ports and a plurality of second communication ports, and the outlet pipe is correspondingly provided with a plurality of first docking ports and a plurality of second docking ports.

[0021] In an embodiment, the cooling system further includes a heat-conducting gel, the heat-conducting gel is filled in the periphery of the liquid cooling pipe.

[0022] The application also provides an electric vehicle, the electric vehicle includes the battery pack according to any one of the above. Advantages

[0023] The technical scheme of the present application, the shell comprises an upper cover and a lower cover, the upper cover comprises an upper cover left part and an upper cover right part arranged separately, the upper cover left part comprises a first top, an upper left side part connected to the left side of the first top, and a first upper front side part and a first upper rear side part connected to the front side and the rear side of the first top respectively, the upper cover right part comprises a second top, an upper right side part connected to the right side of the second top, and a second upper front side part and a second upper rear side part connected to the front side and the rear side of the second top respectively; the lower cover is arranged separately from the upper cover and connected in the up-down direction, the lower cover comprises a lower cover left part and a lower cover right part arranged separately, the lower cover left part comprises a first bottom, a lower left side part connected to the left side of the first bottom, and a first lower front side part and a first lower rear side part connected to the front side and the rear side of the first bottom respectively, the lower cover right part comprises a second bottom, a lower right side part connected to the right side of the second bottom, and a second lower front side part and a second lower rear side part connected to the front side and the rear side of the second bottom respectively; wherein the upper cover left part and the upper cover right part are connected through an upper connecting structure, the lower cover left part and the lower cover right part are connected through a lower connecting structure, the upper connecting structure and the lower connecting structure are adjustably arranged in the left-right direction, thus, by adjusting the size of the upper connecting structure and the lower connecting structure in the left-right direction, the size of the shell can be adjusted, so that different battery pack boundaries can be adapted, different vehicle models with different power requirements can be applied, and tooling molds can be shared, greatly reducing the research and development cost and period. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0025] Fig. 1 is an exploded schematic view of the structure of an embodiment of the battery pack provided by the present application;

[0026] Fig. 2 is an exploded schematic view of the upper cover in Fig. 1;

[0027] Fig. 3 is a schematic view of the structure of the lower cover in Fig. 1;

[0028] Fig. 4 is an exploded schematic view of the lower cover in Fig. 3;

[0029] Fig. 5 is an enlarged schematic view of the local part A in Fig. 3;

[0030] Fig. 6 is a schematic view of the structure of the cooling system in Fig. 1;

[0031] Fig. 7 is a schematic view of the structure of the cooling pipeline in Fig. 6;

[0032] Fig. 8 is an exploded schematic view of the cooling pipeline in Fig. 6.

[0033] BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Battery pack; 1, upper cover; 11, upper cover left part; 111, first top part; 112, upper left side part; 113, first upper front side part; 114, first upper rear side part; 12, upper cover right part; 121, second top part; 122, upper right side part; 123, second upper front side part; 124, second upper rear side part; 13, upper cover middle part; 131, third top part; 132, third upper front side part; 133, third upper rear side part; 2, lower cover; 21, lower cover left part; 211, first bottom part; 212, lower left side part; 213, first lower front side part; 214, first lower rear side part; 22, lower cover right part; 221, second bottom part; 222, lower right side part; 223, second lower front side part; 224, second lower rear side part; 23, lower cover middle part; 231, third bottom part; 232, third lower front side part; 233, third lower rear side part; 3, battery cell; 4, cooling system; 41, cooling pipeline; 411, liquid inlet and outlet part; 4111, liquid inlet pipe; 41111, liquid inlet port; 41112, communication port; 411121, first communication port; 411122, second communication port; 4112, liquid outlet pipe; 41121, liquid outlet port; 41122, docking port; 411221, first docking port; 411222, second docking port; 412, flow channel part; 4121, liquid cooling pipe; 41211, liquid flow inlet; 41212, liquid flow outlet; 4121a, first liquid cooling pipe; 4121b, second liquid cooling pipe; 42, heat-conducting gel.

[0035] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. Embodiment of the present application

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] It should be noted that if the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0038] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope claimed by the present application.

[0039] The present application provides a shell for a battery pack, and Figs. 1 to 8 are embodiments of the battery pack.

[0040] Please refer to Figs. 1 to 4, in an embodiment of the present application, the shell comprises an upper cover 1 and a lower cover 2, the upper cover 1 comprises an upper cover left part 11 and an upper cover right part 12 arranged separately, the upper cover left part 11 comprises a first top part 111, an upper left side part 112 connected to the left side of the first top part 111, and a first upper front side part 113 and a first upper rear side part 114 connected to the front side and the rear side of the first top part 111 respectively, the upper cover right part 12 comprises a second top part 121, an upper right side part 122 connected to the right side of the second top part 121, and a second upper front side part 123 and a second upper rear side part 124 connected to the front side and the rear side of the second top part 121 respectively; the lower cover 2 is arranged separately from the upper cover 1 and connected in up-down direction, the lower cover 2 comprises a lower cover left part 21 and a lower cover right part 22 arranged separately, the lower cover left part 21 comprises a first bottom part 211, a lower left side part 212 connected to the left side of the first bottom part 211, and a first lower front side part 213 and a first lower rear side part 214 connected to the front side and the rear side of the first bottom part 211 respectively, the lower cover right part 22 comprises a second bottom part 221, a lower right side part 222 connected to the right side of the second bottom part 221, and a second lower front side part 223 and a second lower rear side part 224 connected to the front side and the rear side of the second bottom part 221 respectively; wherein the upper cover left part 11 and the upper cover right part 12 are connected through an upper connecting structure, the lower cover left part 21 and the lower cover right part 22 are connected through a lower connecting structure, and the upper connecting structure and the lower connecting structure are adjustably arranged in left-right direction.

[0041] The technical scheme of the present application, the upper cover left part 11 and the upper cover right part 12 are connected through the upper connecting structure, the lower cover left part 21 and the lower cover right part 22 are connected through the lower connecting structure, the size of the upper connecting structure and the lower connecting structure in the left and right directions can be adjusted, so that by adjusting the size of the upper connecting structure and the lower connecting structure in the left and right directions, the size of the shell can be adjusted, so as to adapt to different battery pack 100 boundaries, suitable for different power demand vehicle models, and the tooling mold can be shared, greatly reducing the research and development cost and period.

[0042] The present application does not limit the specific setting of the upper connecting structure and the lower connecting structure, for example, the upper cover left part 11 is arranged inside the upper cover right part 12, the upper cover left part 11 and the upper cover right part 12 have upper lap joints arranged on the inside and outside and overlapping each other, the upper lap joints form the upper connecting structure, by adjusting the size of the upper lap joints in the left and right directions, the effective size of the upper cover 1 in the left and right directions can be adjusted, similarly, the lower cover left part 21 is arranged inside the lower cover right part 22, the lower cover left part 21 and the lower cover right part 22 have lower lap joints arranged on the inside and outside and overlapping each other, the lower lap joints form the lower connecting structure, by adjusting the size of the lower lap joints in the left and right directions, the effective size of the lower cover 2 in the left and right directions can be adjusted.

[0043] In the embodiments of the present application, the upper connecting structure includes an upper cover middle part 13, the upper cover left part 11 and the upper cover right part 12 are connected through the upper cover middle part 13, the upper cover middle part 13 includes a third top part 131, and a third upper front side part 132 and a third upper rear side part 133 connected to the front side and the rear side of the third top part 131 respectively; the lower connecting structure includes a lower cover middle part 23, the lower cover left part 21 and the lower cover right part 22 are connected through the lower cover middle part 23, the lower cover middle part 23 includes a third bottom part 231, and a third lower front side part 232 and a third lower rear side part 233 connected to the front side and the rear side of the third bottom part 231 respectively, thus, the size of the upper cover middle part 13 in the left-right upward direction is set as required, so as to adjust the size of the upper cover 1 in the left-right upward direction, similarly, the size of the lower cover middle part 23 in the left-right downward direction is set as required, so as to adjust the size of the lower cover 2 in the left-right downward direction, and since the upper cover middle part 13 and the lower cover middle part 23 are both designed in the form of open at both ends, only the length of the steel plate of the upper cover middle part 13 and the lower cover middle part 23 needs to be changed in the production process, without the need to develop a new mold, so as to change the size of the produced upper cover middle part 13 and lower cover middle part 23, at the same time, since the upper cover left part 11 and the upper cover right part 12 are of fixed specifications, the structure remains consistent in different boundary battery packs 100, without the need to develop a new mold, so as to realize the production of a shell with different internal space sizes by a set of molds, and by putting different numbers of battery cells 3 in the shell, a set of battery systems is realized to adapt to the needs of different vehicle models.

[0044] In the embodiments of the present application, the upper cover left part 11, the upper cover middle part 13, and the upper cover right part 12 are all formed by stamping a steel plate, which has high structural strength and rigidity, can provide high torsional stiffness for the whole vehicle, and can directly provide support for the battery cells 3, realizing the CTP (Cell To PACK, battery-battery pack 100) scheme of the battery system.

[0045] In the embodiments of the present application, the upper cover left part 11, the upper cover middle part 13, and the upper cover right part 12 are all formed by stamping a steel plate, which has high structural strength and rigidity, can provide high torsional stiffness for the whole vehicle, and can directly provide support for the battery cells 3, realizing the CTP (Cell To PACK, battery-battery pack 100) scheme of the battery system.

[0046] In the embodiments of the present application, the left end and the right end of the third upper front side portion 132 are correspondingly lap welded with the first upper front side portion 113 and the second upper front side portion 123, and the left end and the right end of the third upper rear side portion 133 are correspondingly lap welded with the first upper rear side portion 114 and the second upper rear side portion 124, that is, the three sections of the upper cover left portion 11, the upper cover middle portion 13 and the upper cover right portion 12 are lap welded, specifically, the upper cover left portion 11 and the upper cover right portion 12 are lap welded on the upper cover middle portion 13, and then connected by arc welding plus electric welding, so as to ensure sufficient connection strength.

[0047] As shown in FIG. 5, in the embodiments of the present application, the left end and the right end of the third lower front side portion 232 are correspondingly lap welded with the first lower front side portion 213 and the second lower front side portion 223, and the left end and the right end of the third lower rear side portion 233 are correspondingly lap welded with the first lower rear side portion 214 and the second lower rear side portion 224, that is, the three sections of the lower cover left portion 21, the lower cover middle portion 23 and the lower cover right portion 22 are lap welded, specifically, the lower cover left portion 21 and the lower cover right portion 22 are lap welded on the lower cover middle portion 23, and then connected by arc welding plus electric welding, so as to ensure sufficient connection strength.

[0048] The present application also provides a battery pack 100, which comprises a shell and a battery cell 3 arranged in the shell. The specific structure of the shell is referred to the above embodiments. Since the battery pack 100 adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0049] As shown in FIGS. 6-8, in the embodiment of the present application, the battery pack 100 further comprises a cooling system 4, which comprises a cooling pipeline 41 arranged between the battery cell 3 and the lower cover 2. The cooling pipeline 41 comprises an inlet and outlet portion 411 and a flow channel portion 412. The inlet and outlet portion 411 comprises an inlet pipe 4111 and an outlet pipe 4112. The inlet pipe 4111 is provided with an inlet port 41111 for connecting with a cooling liquid source and a communication port 41112. The outlet pipe 4112 is provided with a discharge port 41121 for discharging the cooling liquid and a counter port 41122. The flow channel portion 412 is arranged separately from the inlet and outlet portion 411. The flow channel portion 412 comprises a liquid cooling pipe 4121 for heat exchange with the battery cell 3. The liquid cooling pipe 4121 is provided with a liquid inlet port 41211 and a liquid outlet port 41212. The liquid inlet port 41211 is used to communicate with the communication port 41112, and the liquid outlet port 41212 is used to communicate with the counter port 41122. In this way, the inlet and outlet portion 411 is of a fixed specification structure, and the flow channel portion 412 is of a variable structure. The size of the flow channel portion 412 can be changed according to the size of the shell in the left-right and upward directions. Specifically, the liquid cooling pipe 4121 of the flow channel portion 412 is an aluminum pipe formed by bending. In the production process, only the length of the liquid cooling pipe 4121 before bending needs to be changed, and the bending radius remains unchanged, so that the size of the flow channel portion 412 can be changed. Thus, one set of cooling system 4 can be adapted to different sizes of shell space functions, can be adapted to different boundary battery systems, and the tooling mold can also be shared, thereby further reducing the research and development cost and cycle.

[0050] In the embodiment of the present application, the flow channel part 412 includes two liquid cooling pipes 4121, the two liquid cooling pipes 4121 include a first liquid cooling pipe 4121a and a second liquid cooling pipe 4121b, the liquid inlet pipe 4111 is correspondingly provided with two communication openings 41112, the two communication openings 41112 include a first communication opening 411121 and a second communication opening 411122, the liquid outlet pipe 4112 is correspondingly provided with two butt joints 41122, the two butt joints 41122 include a first butt joint 411221 and a second butt joint 411222, the liquid inlet pipe 4111 and the liquid outlet pipe 4112 are arranged in parallel, in the extension direction of the liquid inlet pipe 4111, the first communication opening 411121 is arranged adjacent to the second butt joint 411222, and the second communication opening 411122 is arranged adjacent to the first butt joint 411221, so that the flow directions of the cooling liquid in the first liquid cooling pipe 4121a and the second liquid cooling pipe 4121b are opposite, in this way, the arrangement of the two liquid cooling pipes 4121 can increase the distribution density of the liquid cooling pipes 4121, and it can be understood that the temperature of the cooling liquid gradually increases along the flow in the liquid cooling pipe 4121, the closer to the communication opening 41112, the lower the temperature, and the closer to the butt joint 41122, the higher the temperature, the flow directions of the cooling liquid in the first liquid cooling pipe 4121a and the second liquid cooling pipe 4121b are opposite, which can uniformly cool the corresponding cell 3 area and improve the thermal management efficiency.

[0051] In the embodiment of the present application, the flow channel part 412 is provided with a plurality of flow channel parts 412, the plurality of flow channel parts 412 are distributed along the extension direction of the liquid inlet pipe 4111, the liquid inlet pipe 4111 is correspondingly provided with a plurality of first communication openings 411121 and a plurality of second communication openings 411122, and the liquid outlet pipe 4112 is correspondingly provided with a plurality of first butt joints 411221 and a plurality of second butt joints 411222, a plurality of flow channel parts 412 are arranged, and each flow channel part 412 is separately provided with a first communication opening 411121, a second communication opening 411122, a first butt joint 411221 and a second butt joint 411222, that is, the liquid inlet and outlet openings of each flow channel part 412 are separated, which ensures that the liquid inlet temperature of each flow channel part 412 is uniform, so that the cooling of the cells 3 in the battery system is uniform, and the uniformity of the battery system is good.

[0052] In the embodiment of the present application, the cooling system 4 further comprises a heat-conducting gel 42, which is filled in the periphery of the liquid cooling pipe 4121, and the heat-conducting gel 42 is evenly filled around the liquid cooling pipe 4121 of the flow channel part 412. The heat-conducting gel 42 has a heat transfer effect, and can transfer the heat of the battery cell 3 to the side of the flow channel part 412, so as to realize the cooling of the top and side of the flow channel part 412, increase the cooling area, and further ensure the uniformity of the temperature of the battery system. Meanwhile, the heat-conducting gel 42 also has a structure strengthening effect, and can fix the flow channel part 412 on the lower cover 2, so as to further strengthen the structural strength of the battery system. Since the heat-conducting structural gel is a flowable material, under different battery system envelope boundaries, only the amount of filled heat-conducting structural gel needs to be increased or reduced, so as to ensure the expansibility of the cooling system 4, and ensure the fixing effect and cooling effect of the cooling system 4.

[0053] The present application also provides an electric vehicle, and the electric vehicle battery pack 100. The specific structure of the battery pack 100 is referred to the above-mentioned embodiments. Since the electric vehicle adopts all the technical solutions of the above-mentioned battery pack 100, at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0054] The above-mentioned is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the technical concept of the present application, and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A housing for a battery pack, wherein, The shell comprises: The upper cover comprises a left part and a right part, the left part comprises a first top, a left upper side connected to the left side of the first top, and a first upper front side and a first upper rear side connected to the front side and the rear side of the first top respectively, and the right part comprises a second top, a right upper side connected to the right side of the second top, and a second upper front side and a second upper rear side connected to the front side and the rear side of the second top respectively; and The lower cover is arranged separately from the upper cover and connected vertically, and comprises a left part and a right part, the left part comprises a first bottom, a left lower side connected to the left side of the first bottom, and a first lower front side and a first lower rear side connected to the front side and the rear side of the first bottom respectively, and the right part comprises a second bottom, a right lower side connected to the right side of the second bottom, and a second lower front side and a second lower rear side connected to the front side and the rear side of the second bottom respectively; The left part and the right part of the upper cover are connected by an upper connecting structure, the left part and the right part of the lower cover are connected by a lower connecting structure, and the upper connecting structure and the lower connecting structure are adjustable in the left-right direction.

2. The housing of claim 1, wherein, The upper connecting structure comprises an upper middle part, the left part and the right part of the upper cover are connected through the upper middle part, and the upper middle part comprises a third top, and a third upper front side and a third upper rear side connected to the front side and the rear side of the third top respectively; The lower connecting structure comprises a lower middle part, the left part and the right part of the lower cover are connected through the lower middle part, and the lower middle part comprises a third bottom, and a third lower front side and a third lower rear side connected to the front side and the rear side of the third bottom respectively.

3. The housing of claim 2, wherein, The left part, the middle part and the right part of the upper cover are all stamped from a steel plate; and / or The left part, the middle part and the right part of the lower cover are all stamped from a steel plate.

4. The housing of claim 3, wherein, The left end and the right end of the third upper front side are respectively overlapped and welded with the first upper front side and the second upper front side, and the left end and the right end of the third upper rear side are respectively overlapped and welded with the first upper rear side and the second upper rear side; and / or The left end and the right end of the third lower front side are respectively overlapped and welded with the first lower front side and the second lower front side, and the left end and the right end of the third lower rear side are respectively overlapped and welded with the first lower rear side and the second lower rear side.

5. A battery pack, wherein, The battery pack comprises the shell according to any one of claims 1 to 4, and a cell arranged in the shell.

6. The battery pack of claim 5, wherein, The battery pack further comprises a cooling system, the cooling system comprises a cooling pipeline arranged between the cell and the lower cover, and the cooling pipeline comprises: An inlet and outlet part, comprising an inlet pipe and an outlet pipe, the inlet pipe is provided with an inlet port connected with a cooling liquid source and a communication port, and the outlet pipe is provided with a discharge port for discharging cooling liquid and a butt joint port; and An outlet and inlet part, comprising an outlet pipe and an inlet pipe, the outlet pipe is provided with a communication port connected with the butt joint port of the inlet and outlet part and a discharge port for discharging cooling liquid, and the inlet pipe is provided with an inlet port connected with the communication port of the inlet and outlet part and a butt joint port; and A pipeline part, comprising a pipeline connected with the inlet and outlet part and the outlet and inlet part. The flow passage part is arranged separately from the liquid inlet and outlet part, and comprises a liquid cooling pipe for heat exchange with the battery cell. The liquid cooling pipe is provided with a liquid inlet and a liquid outlet. The liquid inlet is communicated with the communicating port, and the liquid outlet is communicated with the docking port.

7. The battery pack of claim 6, wherein, The flow passage part comprises two liquid cooling pipes, i.e., a first liquid cooling pipe and a second liquid cooling pipe. The liquid inlet pipe is correspondingly provided with two communicating ports, i.e., a first communicating port and a second communicating port. The liquid outlet pipe is correspondingly provided with two docking ports, i.e., a first docking port and a second docking port. The liquid inlet pipe and the liquid outlet pipe are arranged in parallel. In the extension direction of the liquid inlet pipe, the first communicating port is arranged adjacent to the second docking port, and the second communicating port is arranged adjacent to the first docking port, so that the flow directions of the cooling liquid in the first liquid cooling pipe and the second liquid cooling pipe are opposite.

8. The battery pack of claim 7, wherein, The flow passage part is provided in plurality. The plurality of flow passage parts are distributed along the extension direction of the liquid inlet pipe. The liquid inlet pipe is correspondingly provided with a plurality of first communicating ports and a plurality of second communicating ports. The liquid outlet pipe is correspondingly provided with a plurality of first docking ports and a plurality of second docking ports.

9. The battery pack of claim 6, wherein, The cooling system further comprises a heat-conducting gel filled in the periphery of the liquid cooling pipe.

10. An electric vehicle, wherein, The electric vehicle comprises the battery pack according to any one of claims 5 to 9.

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