Battery pack and vehicle

Abstract

A battery pack and a vehicle. The battery pack comprises a battery cell module (3) and a case (1). The battery cell module (3) comprises at least one column of battery cells arranged in a first direction. A pull bar (8) is arranged on the end faces of each column of battery cells on which poles (31) are provided; the pull bar (8) extends in the first direction; the case (1) is provided with an accommodating cavity; the battery cell module (3) is arranged in the accommodating cavity, and the end faces where the poles (31) are located face the bottom wall of the accommodating cavity; the pull bar (8) abuts against the bottom wall to form a liquid storage flow channel (111) in the accommodating cavity; and the poles (31) at least partially extend into the liquid storage flow channel (111). The battery cells are inverted in the case (1), the pull bar (8) is arranged on the end faces of the battery cells on which the poles (31) are provided, and the pull bar (8), the end faces of the battery cells on which the poles (31) are provided, and the bottom wall and the inner peripheral wall of the accommodating cavity form the liquid storage flow channel (111), thereby achieving a flow guide effect on a cooling liquid in the accommodating cavity, improving the fluidity of the cooling liquid, and further improving the cooling effect on the poles (31).

Description

Battery pack and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410145592.X and application date on February 1, 2024, and the Chinese patent application with application number 202420255019.X and application date on February 1, 2024, and claims the priority of the Chinese patent application. The entire contents of the Chinese patent application are hereby introduced into this application as a reference. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular to a battery pack and a vehicle. Background Art

[0004] With the rapid development of battery energy storage thermal management technology, the cooling method has gradually shifted from air cooling to liquid cooling. Liquid cooling methods include liquid cooling plates and immersion cooling. Liquid cooling plates have many problems with cooling the poles and bars of battery cells. These include cell expansion causing misalignment between the liquid cooling plate and the bars, thermal runaway leading to leakage of the liquid cooling plate, and insulation problems caused by condensation on the liquid cooling plate, bars, and poles. Furthermore, heat exchange between the poles, bars, and coolant requires cooling through the cooling plate, resulting in relatively poor heat exchange. Furthermore, the liquid cooling plate takes up a lot of space, preventing the battery pack from miniaturizing.

[0005] The immersion cooling method allows the coolant to directly contact the poles and bars for better cooling and heat dissipation, while solving many problems existing in the liquid cold plate. However, when the immersion cooling method is used to cool the poles and bars in the related technology, the coolant is directly introduced into the box and the poles and bars are immersed in the coolant. Since the space inside the box is large, the coolant will disperse freely in the larger space after entering the box, and the power will be weakened, resulting in poor coolant fluidity and poor cooling effect. Summary of the Invention

[0006] In order to solve the above technical problems, embodiments of the present disclosure provide a battery pack and a vehicle.

[0007] In a first aspect, an embodiment of the present disclosure provides a battery pack, comprising:

[0008] A battery cell module, wherein the battery cell module includes at least one column of battery cells arranged along a first direction, and a pull strip is provided on the end face of the pole of each column of battery cells, and the pull strip extends along the first direction; a box body, wherein the box body has a accommodating cavity, the battery cell module is arranged in the accommodating cavity, and the end face of the pole of the battery cell is located facing the bottom wall of the accommodating cavity, the pull strip abuts against the bottom wall to form a liquid storage flow channel in the accommodating cavity, and at least part of the pole of the battery cell extends into the liquid storage flow channel.

[0009] In the battery pack of the disclosed embodiment, the battery cell module includes at least one column of battery cells arranged along a first direction, and a pull strip is provided on the end surface of the pole of each column of battery cells, and the pull strip extends along the first direction. The box body has a accommodating cavity, and the battery cell module is arranged in the accommodating cavity, and the end surface of the pole of the battery cell faces the bottom wall of the accommodating cavity. The pull strip abuts against the bottom wall to form a liquid storage flow channel in the accommodating cavity, and at least part of the pole of the battery cell extends into the liquid storage flow channel. Therefore, the pull strip arranged on the end surface of the battery cell can cooperate with the bottom surface of the battery cell and the bottom wall and inner wall of the accommodating cavity to form a liquid storage flow channel, thereby having a drainage effect on the cooling liquid in the accommodating cavity, improving the fluidity of the cooling liquid, and further improving the cooling effect on the pole of the battery cell.

[0010] In some embodiments, two pull bars are provided on the end face of the pole of each column of the battery cell, and the two pull bars are respectively located on both sides of the end face of the battery cell.

[0011] And / or, the brace is a hollow structure;

[0012] And / or, the bottom surface of the pull strip is in sealing contact with the bottom wall of the accommodating cavity.

[0013] In some embodiments, a reinforcing beam extending along the second direction is provided in the accommodating cavity, the two ends of the reinforcing beam are respectively connected to the inner wall of the accommodating cavity and an avoidance gap is formed between the reinforcing beam and the bottom wall, the pull rod passes through the avoidance gap, and the second direction is perpendicular to the first direction.

[0014] In some embodiments, a support column is provided between the reinforcing beam and the bottom wall, the pull strip includes a first pull strip opposite to the support column in the second direction, the first pull strip includes a front section pull strip and a rear section pull strip arranged at intervals in the first direction, and the support column is located between the front section pull strip and the rear section pull strip.

[0015] In some embodiments, a connecting bar is connected to the end surface of the pole of each battery cell facing the bottom wall, and the connecting bar is used to connect multiple poles of the same column of battery cells, and at least part of the connecting bar extends into the liquid storage channel.

[0016] In some embodiments, the battery cell module further includes an end bar, which is connected between different columns of battery cells and is located at the end of the battery cell module in the first direction. The pull strip includes a second pull strip opposite to the end bar in the second direction, and the orthographic projection of the end bar on the battery cell module is outside the orthographic projection of the second pull strip on the battery cell module.

[0017] In some embodiments, a buffer is provided between the pull bar and the bottom wall.

[0018] In some embodiments, the battery pack further includes a top liquid cooling plate and a connecting pipe, wherein the top liquid cooling plate is connected at the opening of the accommodating cavity and contacts the end face of the battery cell module facing away from the bottom wall, and one end of the connecting pipe is connected to the top liquid cooling plate, and the other end extends into the accommodating cavity.

[0019] In some embodiments, the battery pack further includes a liquid inlet pipeline and a liquid return pipeline, the liquid inlet pipeline is connected to the top liquid cooling plate, and the liquid return pipeline is connected to the accommodating cavity.

[0020] In a second aspect, an embodiment of the present disclosure provides a battery pack, comprising: a battery cell module, the battery cell module comprising at least one row of battery cells arranged along a first direction; a box body, the box body having a accommodating cavity, the bottom wall of the accommodating cavity having a partition protruding toward the battery cell module, the partition and the bottom wall of the accommodating cavity forming at least one liquid storage channel, the liquid storage channel extending along the first direction and open toward the battery cell module; wherein, the battery cell module is arranged in the accommodating cavity, and the end face where the pole of the battery cell is located faces the bottom wall of the accommodating cavity, and both sides of the end face of each battery cell facing the bottom wall are in sealing contact with the partition respectively, and the pole of each battery cell extends into the liquid storage channel.

[0021] In some embodiments, the partition includes an annular outer partition and multiple inner partitions, and the multiple inner partitions are arranged in the annular outer partition at intervals along the second direction and extend along the first direction. The annular outer partition, the multiple inner partitions and the bottom wall of the accommodating cavity form multiple liquid storage channels. The battery cell module includes multiple rows of battery cells arranged along the second direction, each of the liquid storage channels corresponds to a row of battery cells, and the second direction is perpendicular to the first direction.

[0022] In some embodiments, there is a gap between both ends of each inner partition and the annular outer partition.

[0023] In some embodiments, the battery pack further includes a sealing strip, which is sandwiched between the partition and the end surface of the battery cell facing the bottom wall of the accommodating cavity.

[0024] In some embodiments, a connecting bar is further connected to the end surface of the pole of each of the battery cells facing the bottom wall of the accommodating cavity, and at least a portion of the connecting bar extends into the liquid storage channel.

[0025] In some embodiments, the battery pack further includes a top liquid cooling plate and a connecting pipe, wherein the top liquid cooling plate is connected at the opening of the accommodating cavity and contacts the end face of the battery cell module facing away from the bottom wall, and the connecting pipe is connected between the top liquid cooling plate and the liquid storage channel.

[0026] In some embodiments, a water inlet and a water outlet are provided on the annular outer partition, both ends of the plurality of inner partitions are separated from the annular outer partition, and the top liquid cooling plate is connected to the water inlet via a connecting pipe.

[0027] In some embodiments, the battery pack further includes a liquid inlet line and a liquid return line, wherein the liquid inlet line is connected to the top liquid cooling plate and one of the liquid storage channels, and the liquid return line is connected to the top liquid cooling plate and the other of the liquid storage channels, and the liquid inlet line and the liquid return line are integrated into one.

[0028] In some embodiments, in the first direction, the connecting pipe is located on one side of the battery cell module, and the liquid inlet pipe and the liquid return pipe are located on the other side of the battery cell module.

[0029] In a third aspect, an embodiment of the present disclosure provides a vehicle comprising the battery pack as described above.

[0030] The technical solution provided by the embodiments of the present disclosure has the following advantages over the prior art:

[0031] A battery pack provided by the first aspect of the embodiment of the present disclosure is adopted, in which the battery cell module of the battery pack is inverted in the accommodating cavity of the box body, and a pull strip is provided on the end face of the battery cell where the pole is set, and the pull strip abuts against the bottom wall to form a liquid storage flow channel in the accommodating cavity, and at least part of the pole of the battery cell extends into the liquid storage flow channel. Thus, the pull strip arranged on the end face of the battery cell can cooperate with the bottom surface of the battery cell and the bottom wall and inner peripheral wall of the accommodating cavity to form a liquid storage flow channel, thereby having a drainage effect on the coolant in the accommodating cavity, improving the fluidity of the coolant, and further improving the cooling effect on the pole of the battery cell.

[0032] A battery pack provided by the second aspect of an embodiment of the present disclosure comprises a cell module of the battery pack including at least one row of cells arranged along a first direction, a box body having a accommodating cavity, a bottom wall of the accommodating cavity having a partition protruding toward the cell module, the partition and the bottom wall of the accommodating cavity forming at least one liquid storage channel, the liquid storage channel extending along the first direction and open toward the cell module, the cell module being arranged in the accommodating cavity, and the end face where the pole of the cell is located facing the bottom wall of the accommodating cavity, the two sides of the end face of each cell facing the bottom wall are respectively in sealing contact with the partition, and the pole of each cell extends into the liquid storage channel, thereby, the partition, the bottom wall of the box body and the cell module can constitute an independent liquid storage channel, the coolant in the liquid storage channel will not leak to other areas of the battery pack, thereby realizing dry and wet separation, ensuring that the components in the battery pack are compatible with the coolant, and since the coolant is restricted to remain in the partition, the coolant will not leak when the components in the battery pack are repaired, thereby ensuring the feasibility and convenience of maintenance. Furthermore, by forming a liquid storage flow channel, the coolant in the accommodating cavity is drained, the fluidity of the coolant is improved, and the cooling effect on the pole of the battery cell is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0034] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without inventive work, including:

[0035] FIG1 is an exploded view of a battery pack according to an embodiment of the present disclosure.

[0036] FIG2 is a schematic structural diagram of the top liquid cooling plate of the battery pack according to an embodiment of the present disclosure.

[0037] FIG3 is a schematic diagram of an inverted battery cell of a battery pack according to an embodiment of the present disclosure.

[0038] FIG4 is a cross-sectional view of a battery pack according to an embodiment of the present disclosure.

[0039] FIG5 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing the layout of the connecting pipes.

[0040] FIG6 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing the layout of the liquid inlet and liquid return lines.

[0041] FIG. 7 is an exploded view of a battery pack according to another embodiment of the present disclosure.

[0042] FIG8 is a schematic structural diagram of the bottom guard plate of the battery pack according to an embodiment of the present disclosure.

[0043] FIG. 9 is a cross-sectional view of a battery pack according to an embodiment of the present disclosure.

[0044] FIG10 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing the layout of the liquid inlet and liquid return lines.

[0045] FIG11 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure, showing the layout of the connecting pipes. DETAILED DESCRIPTION

[0046] The following describes embodiments of the present disclosure in more detail with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0047] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0048] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0049] As shown in FIG. 1 to FIG. 6 , the battery pack disclosed herein includes a box body 1 and a battery cell module 3 .

[0050] Specifically, the battery cell module 3 includes at least one row of battery cells arranged along a first direction, and a pull strip 8 is provided on the end face of the pole 31 of each row of battery cells. The pull strip 8 extends along the first direction and is located on one side of the pole 31. The box body 1 has a accommodating cavity, the battery cell module 3 is arranged in the accommodating cavity, and the end face of the pole 31 of the battery cell faces the bottom wall of the accommodating cavity. The pull strip 8 abuts against the bottom wall to form a liquid storage channel 111 in the accommodating cavity, and at least part of the pole 31 of the battery cell extends into the liquid storage channel 111.

[0051] Specifically, as shown in Figure 1, the box body 1 includes a bottom guard plate 11 and a peripheral plate 12 detachably connected to the bottom guard plate 11. The peripheral plate 12 and the bottom guard plate 11 form a accommodating cavity. The end surface of the bottom guard plate 11 facing the top liquid cooling plate 2 is constructed as a bottom wall, and a sealing gasket is provided between the bottom guard plate 11 and the peripheral plate 12. After the battery cell module 3 is inverted, the pole 31 of the battery cell faces the bottom guard plate 11. After the coolant is introduced into the accommodating cavity, the coolant can flow along the liquid storage channel 111 and directly cool the pole 31 of the battery cell. Compared with the traditional cooling method of using the liquid cooling plate and the pole 31 in combination, the immersion cooling is more direct and has a better cooling effect. It also solves the problems of position dislocation, breakage, and coolant leakage of the liquid cooling plate when the battery cell expands or thermal runaway occurs. And since a pull strip 8 is provided on the end face where the pole of the battery cell is located, the pull strip 8 cooperates with the bottom surface of the battery cell, the bottom wall and the inner wall of the accommodating cavity to form a liquid storage channel 111, thereby draining the coolant in the accommodating cavity, improving the fluidity of the coolant, and further improving the cooling effect.

[0052] In addition, the box body 1 is composed of a detachably connected bottom guard plate 11 and the box body 1. When the battery pack needs to be repaired, it is only necessary to remove the bottom guard plate 11, which is easy to operate.

[0053] In the battery pack of the disclosed embodiment, the battery cell module 3 includes at least one column of battery cells arranged along a first direction, and a pull strip 8 is provided on the end face of the pole 31 of each column of battery cells, and the pull strip 8 extends along the first direction. The box body 1 has a accommodating cavity, and the battery cell module 3 is arranged in the accommodating cavity, and the end face of the pole 31 of the battery cell faces the bottom wall of the accommodating cavity. The pull strip 8 abuts against the bottom wall to form a liquid storage channel 111 in the accommodating cavity, and at least part of the pole 31 of the battery cell extends into the liquid storage channel 111. Therefore, the pull strip 8 arranged on the end face of the battery cell can cooperate with the bottom surface of the battery cell and the bottom wall and inner wall of the accommodating cavity to form the liquid storage channel 111, thereby having a drainage effect on the coolant in the accommodating cavity, improving the fluidity of the coolant, and further improving the cooling effect on the pole 31 of the battery cell.

[0054] It should be noted that the coolant in the accommodating cavity is not limited to immersing only the pole 31. For example, when the height of the coolant is higher than the shoulder of the battery cell, the corresponding battery cell body can also be cooled. For example, an installation cavity for constructing the battery energy distribution unit 100 is also provided in the box body 1, and a partition is provided between the installation cavity and the accommodating cavity. When the height of the coolant is higher than the partition, the coolant will flow into the installation cavity and cool the battery energy distribution unit 100.

[0055] In addition, when the battery cell module 3 includes multiple columns of battery cells, if the first direction is the length direction of the battery cells, the multiple columns of battery cells are arranged in the width direction of the battery cells; if the first direction is the width direction of the battery cells, the multiple columns of battery cells are arranged in the length direction of the battery cells. Specifically, the spacing arrangement direction of the two poles 31 of the battery cell is defined as the length direction of the battery cell, and the width direction is perpendicular to the arrangement direction of the two poles 31.

[0056] It should be noted that the number of pull strips 8 arranged on each column of battery cells can be multiple or one. Taking the battery cell module 3 including a column of battery cells as an example, when a pull strip 8 is set on each column of battery cells, when the first direction is the length direction of the battery cell, the pull strip 8 can be set on one side of the pole 31 in the width direction of the battery cell and extend along the length direction of the battery cell. The pull strip 8 cooperates with the accommodating cavity to form two liquid storage channels 111 located on both sides of the pull strip 8 in the width direction of the battery cell, and the pole 31 is located in the liquid storage channel 111 on the same side; when the first direction is the width direction of the battery cell, the pull strip 8 can be set on one side of any pole 31 in the length direction of the battery cell and extend along the width direction of the battery cell. The pull strip 8 cooperates with the accommodating cavity to form two liquid storage channels 111 located on both sides of the pull strip 8 in the length direction of the battery cell, and the two poles 31 are respectively located in the liquid storage channels 111 on both sides of the pull strip 8.

[0057] For another example, two pull strips 8 are provided on the end face of the pole 31 of each column of battery cells, and the two pull strips 8 are located on both sides of the end face of the battery cell. If the first direction is the length direction of the battery cell, the two pull strips 8 are respectively located on both sides of the pole 31 in the width direction of the battery cell, and the two pull strips 8 cooperate with the end face of the battery cell and the bottom wall of the accommodating cavity to form a liquid storage channel 111 that can correspond to all the poles 31 of the battery cells in this column. If the first direction is the width direction of the battery cell, the two pull strips are respectively located on the opposite outsides of the two poles 31 in the length direction of the battery cell, and the two pull strips 8 cooperate with the end face of the battery cell and the bottom wall of the accommodating cavity to form a liquid storage channel 111 that can correspond to all the poles 31 of the battery cells in this column.

[0058] For another example, when the first direction is the width direction of the battery cell, three pull strips 8 can also be set on the end face of the pole 31 of each column of battery cells, wherein one pull strip 8 can be set between two poles 31, and one pull strip 8 can be set on the opposite outer sides of the two poles 31 respectively. Then, the three pull strips 8 can constitute two liquid storage channels 111 to cool the two poles 31 respectively.

[0059] In addition, two pull bars 8 can be set on one column of battery cells, and one pull bar 8 can be set on another adjacent column of battery cells. Taking the first direction as the length direction of the battery cells, the battery cell module 3 includes two left and right columns of battery cells arranged in the width direction of the battery cells as an example. Then, a left pull bar can be set on the left side of the pole 31 of the left column of battery cells, a right pull bar can be set on the right side of the right column of battery cells, and a middle pull bar can be set on the right side of the pole 31 of the left column of battery cells or on the left side of the pole 31 of the right column of battery cells. The left pull bar and the middle pull bar can constitute a liquid storage channel 111 for cooling the pole 31 of the left column of battery cells, the right pull bar and the middle pull bar can constitute a liquid storage channel 111 for cooling the pole 31 of the right column of battery cells, and the middle pull bar only needs to be set on one of the two columns of battery cells, and the other column only needs to be provided with one pull bar 8. Specifically, the layout of the pull bar 8 can be selected according to the actual working conditions and is not limited here.

[0060] Preferably, the pull bar 8 is a hollow structure, so as to reduce the weight of the battery pack and at the same time play a shock-absorbing and buffering role for the battery cell module 3 during external collisions.

[0061] Preferably, the bottom surface of the pull strip 8 is in sealed contact with the bottom wall of the accommodating cavity, thereby preventing the coolant in the liquid storage channel 111 from leaking from the gap at the edge of the channel, thereby improving the cooling effect.

[0062] Furthermore, when there are no assembly obstacles within the accommodating cavity, the tie bar 8 can be arranged to extend through the accommodating cavity along the first direction. However, when other assembly obstacles exist within the accommodating cavity, the tie bar 8 needs to be assembled to avoid interference. For example, a reinforcing structure is typically provided within the battery pack housing 1 to enhance the structural strength of the battery pack. The assembly of the tie bar 8 needs to avoid interference with the reinforcing structure. For example, as shown in FIG1 , a reinforcing beam 121 extending along the second direction is provided within the accommodating cavity. The two ends of the reinforcing beam 121 are respectively connected to the inner wall of the accommodating cavity, and the reinforcing beam 121 is separated from the bottom wall to form an avoidance gap. The tie bar 8 passes through the avoidance gap, and the second direction is perpendicular to the first direction. Specifically, when assembling the battery cell module 3 and the box body 1, the bottom guard plate 11 can be removed from the peripheral plate 12 first, and then the battery cell module 3 can be loaded upward from the bottom of the peripheral plate 12. The battery cell module 3 is divided into two modules, and the reinforcing beam 121 corresponds to between the two modules. After the assembly is completed, the pull bar 8 is below the reinforcing beam 121, and then the bottom guard plate 11 is assembled and connected to the peripheral plate 12. At this time, it can be seen that the pull bar 8 passes through the avoidance gap. It should be noted that when the first direction is the length direction of the battery cell, the second direction is the width direction of the battery cell. If the battery cell module 3 includes multiple columns of battery cells, the multiple columns of battery cells are arranged in the width direction of the battery cell (the second direction); when the first direction is the width direction of the battery cell, the second direction is the length direction of the battery cell. If the battery cell module 3 includes multiple columns of battery cells, the multiple columns of battery cells are arranged in the length direction of the battery cell (the second direction).

[0063] Furthermore, a support column 122 is provided between the reinforcing beam 121 and the bottom wall. The brace 8 includes a first brace opposite the support column 122 in the second direction. The first brace includes a front brace 81 and a rear brace 82 spaced apart in the first direction. The support column 122 is located between the front brace 81 and the rear brace 82. It will be understood that the support column 122 can improve the structural strength of the reinforcing beam 121 and the reliability of its connection with the box body 1. Dividing the brace 8 corresponding to the support column 122 into two sections can avoid the support column 122 and prevent assembly interference.

[0064] Optionally, the support column 122 may also be provided with structures such as perforations and avoidance grooves, and the pull rod 8 may directly pass through the perforations and avoidance grooves, so that assembly avoidance can be achieved without segmenting the pull rod 8.

[0065] Furthermore, to avoid the brace 8, the reinforcement beam 121 is not limited to being completely separated from the bottom wall as shown above. For example, the reinforcement beam 121 can be connected to the bottom wall, and a clearance hole can be provided on the reinforcement beam 121 that passes through the reinforcement beam 121 along the first direction, so that the brace 8 can pass through the clearance hole. The assembly method of the reinforcement beam 121 and the box body 1 can be determined according to needs and is not limited here.

[0066] Furthermore, as shown in FIG3 , a connecting tab 32 is connected to the end surface of each battery cell's pole 31 facing the bottom wall. The connecting tab 32 is used to connect multiple poles 31 in the same column of battery cells, and at least a portion of the connecting tab 32 extends into the liquid storage channel 111. Thus, the coolant in the liquid storage channel 111 can directly cool not only the poles 31 but also the connecting tab 32. Compared to the traditional cooling method that only uses a liquid cooling plate in contact with the connecting tab 32, immersion cooling can avoid the problem of misalignment between the liquid cooling plate and the connecting tab 32 caused by battery cell expansion or thermal runaway, thereby avoiding cooling failure or tab 32 breakage caused by assembly misalignment.

[0067] In addition, it should be noted that the connecting bar 32 can be completely immersed in the coolant or partially immersed in the coolant, which can be determined according to the layout of the connecting bar 32. For example, after the bar connection 32 is connected to the pole 31, if the overall height of the connecting bar 32 is not higher than the end face of the pole 31 of the battery cell, the coolant will completely immerse the bar 32 when cooling the pole 31. If part of the area of ​​the connecting bar 32 is higher than the end face of the pole 31 of the battery cell (for example, part of the structure of the connecting bar 32 protrudes between adjacent battery cells), the coolant will only immerse part of the area of ​​the connecting bar 32.

[0068] Furthermore, the cell module 3 also includes an end tab, which is connected between different columns of cells and located at the end of the cell module 3 in the first direction. The tie rod 8 includes a second tie rod opposite the end tab in the second direction, and the orthographic projection of the end tab on the cell module 3 is located outside the orthographic projection of the second tie rod on the cell module 3. In other words, the arrangement of the tie rod 8 avoids the end tab. As shown in Figure 1, the second tie rod is shorter than the other tie rods 8, and its end reserves space for the end tab, avoiding assembly interference.

[0069] Optionally, a buffer member 7 is provided between the tie bar 8 and the bottom wall. The upper end of the tie bar 8 is adhesively connected to the battery cell module 3, and the buffer member 7 is adhesively connected to the lower end of the tie bar 8 and the bottom wall. Preferably, the buffer member 7 is a foam cushion. Alternatively, the buffer member 7 may be other structural members with shock absorption and sealing effects, which are not limited here.

[0070] In some embodiments, as shown in FIG1 , the battery pack further includes a top liquid cooling plate 2 and a connecting pipe 6. The top liquid cooling plate 2 is connected to the opening of the accommodating cavity and contacts the end face of the battery cell module 3 facing away from the bottom wall. One end of the connecting pipe 6 is connected to the top liquid cooling plate 2, and the other end extends into the accommodating cavity. Thus, since the top liquid cooling plate 2 and the accommodating cavity are connected via the connecting pipe 6, the top liquid cooling plate 2 and the liquid storage channel 111 only require one set of cooling pipe systems to complete the circulation of the coolant, thereby optimizing the pipe layout. It is understandable that after the battery cell module 3 is inverted, the end face of the battery cell module 3 facing away from the bottom wall is facing the top liquid cooling plate 2, and the top liquid cooling plate 2 can be assembled to contact the end face for heat exchange.

[0071] Furthermore, the battery pack also includes a liquid inlet pipe 4 and a liquid return pipe 5. The liquid inlet pipe 4 is connected to the top liquid cooling plate 2, and the liquid return pipe 5 is connected to the accommodating cavity. Thus, the coolant can flow into the top liquid cooling plate 2 through the liquid inlet pipe 4 and exchange heat with the battery cell. The coolant after heat exchange can flow to the accommodating cavity through the connecting pipe 6. The coolant in the accommodating cavity can flow along the liquid storage channel 111 and immerse the pole 31 to achieve direct cooling of the pole 31. The coolant after heat exchange can flow out through the liquid return pipe 5 connected to the accommodating cavity to complete the cooling cycle. That is, the present application only uses a set of inlet and outlet pipes in conjunction with the connecting pipe 6 to complete the liquid supply to the corresponding top liquid cooling plate 2 and the accommodating cavity. The pipeline layout is simple, the number of pipelines is small, and the battery pack cost is low.

[0072] Furthermore, the top liquid cooling plate 2 includes a plurality of top liquid cooling channels, and the accommodating cavity has a plurality of liquid storage channels 111 opposite to the top liquid cooling channels, and each top liquid cooling channel is connected to the corresponding liquid storage channel 111 by a connecting pipe 6. Thus, the plurality of connecting pipes 6 can evenly supply liquid to the corresponding liquid storage channels 111, ensuring the uniformity of the coolant flow in each liquid storage channel 111, thereby ensuring uniform heat dissipation of each battery cell and improving the thermal management effect. In other embodiments, only one connecting pipe 6 can be provided. After one connecting pipe 6 transports the coolant to the accommodating cavity, the coolant can flow freely into each liquid storage channel 111.

[0073] Furthermore, in the first direction, the connecting pipe 6 is located on one side of the battery cell module 3, and the liquid inlet pipe 4 and the liquid return pipe 5 are located on the other side of the battery cell module 3. In this embodiment, the coolant can flow into the top liquid cold plate 2 through the liquid inlet pipe 4 and fully flow and exchange heat along the length of the battery cell module 3. After that, it flows into the liquid storage channel 111 through the connecting pipe 6 and reaches the end away from the liquid return pipe 5. Then, it fully refluxes and exchanges heat along the length of the battery cell module 3 before flowing out of the liquid return pipe 5, maximizing the effective cooling distance of the coolant.

[0074] Optionally, the liquid inlet pipeline 4 and the liquid return pipeline 5 can be integrated into one to further optimize the pipeline layout space.

[0075] In some embodiments, as shown in Figure 2, the top liquid cooling plate 2 includes a cold plate body 22, an insulating coating 21 and a flow channel plate 23, the flow channel plate 23 has a flow channel, the cold plate body 22 is buckled on the flow channel plate 23, the insulating coating 21 is laid on the cold plate body 22, and the top liquid cooling plate 2 and the battery cell module 3 are connected by thermal conductive glue 9.

[0076] Furthermore, the top liquid cooling plate 2 is provided with a water nozzle 10 extending vertically toward the box body 1, and the connecting pipe 6 is plugged into the water nozzle 10. The water nozzle 10 is connected to the liquid cooling flow channel in the top liquid cooling plate 2. The connecting pipe 6 and the water nozzle 10 are plugged into each other, which can quickly realize the disassembly and assembly of the connecting pipe 6.

[0077] Preferably, as shown in Figure 5, the connecting pipe 6 includes a straight section that is plugged into the water nozzle 10 and a bent section connected to the end of the straight section away from the water nozzle 10. The direction of the outlet end of the bent section is roughly consistent with the extension direction of the liquid storage channel 111, so that the coolant can be transported relatively smoothly between the top liquid cooling plate 2 and the liquid storage channel 111.

[0078] Optionally, as shown in FIG6 , the liquid inlet pipeline 4 and the liquid return pipeline 5 may also be constructed into a bent structure according to layout requirements, and the specific structural form is not limited.

[0079] As shown in FIG7-FIG11 , the battery pack disclosed herein includes a box body 1 and a battery cell module 3 .

[0080] Specifically, the battery cell module 3 includes at least one row of battery cells arranged along a first direction. In other words, the battery cells can be arranged in one row or multiple rows to form a battery cell module 3 in a rectangular shape, for example. The housing 1 has a receiving cavity, the bottom wall of which has a partition 20 protruding toward the battery cell module 3. The partition 20 and the bottom wall of the receiving cavity form at least one liquid storage channel 111, which extends along the first direction and is open toward the battery cell module 3. The battery cell module 3 is disposed within the receiving cavity, and the end face where the battery cell's poles 31 are located faces the bottom wall of the receiving cavity. Both sides of the end face of each battery cell facing the bottom wall are in sealed contact with the partition 20, and the poles 31 of each battery cell extend into the liquid storage channel 111.

[0081] Specifically, as shown in Figure 7, the box body 1 includes a bottom guard plate 11 and a peripheral plate 12 detachably connected to the bottom guard plate 11. The peripheral plate 12 and the bottom guard plate 11 form an accommodating cavity. The end surface of the bottom guard plate 11 facing the accommodating cavity is constructed as the bottom wall of the accommodating cavity, and a sealing gasket 50 is arranged between the bottom guard plate 11 and the peripheral plate 12. After the battery module 3 is inverted, the pole 31 of the battery cell faces the bottom guard plate 11. After the coolant is passed into the liquid storage channel 111, the coolant can directly contact the pole 31 to cool the pole 31. Compared with the traditional method of using a liquid cooling plate and the pole 31 for cooling, immersion cooling is more direct and has a better cooling effect. It also solves the problems of position dislocation, breakage, and coolant leakage of the liquid cooling plate when the battery cell expands or thermal runaway occurs.

[0082] In addition, the box body 1 is composed of a detachably connected bottom guard plate 11 and the box body 1. When the battery pack needs to be repaired, it is only necessary to remove the bottom guard plate 11, which is easy to operate.

[0083] Furthermore, since the partition 20 is in sealed contact with the battery module 3, after the battery module 3 is assembled, the partition 20, the battery module 3, and the housing 1 can form a closed liquid storage channel 111. The coolant in the liquid storage channel 111 will not leak into other areas of the battery pack, achieving dry-wet separation and ensuring that the components in the battery pack are compatible with the coolant. Moreover, since the coolant is confined to remain in the annular partition 20, the coolant will not leak when the components in the battery pack are repaired, ensuring the feasibility and convenience of the repair. For example, as shown in FIG7 , the battery energy distribution unit 100 of the battery pack is located on the outside of the partition 20, and the coolant will not soak the battery energy distribution unit 100.

[0084] In the battery pack of the embodiment of the present disclosure, the cell module 3 includes at least one row of cells arranged along a first direction, the box body 1 has a receiving cavity, the bottom wall of the receiving cavity has a partition 20 protruding toward the cell module 3, the partition 20 and the bottom wall of the receiving cavity form at least one liquid storage channel 111, the liquid storage channel 111 extends along the first direction and is open toward the cell module 3, the cell module 3 is arranged in the receiving cavity, and the end face of the cell pole 31 is facing the bottom wall of the receiving cavity, and the two sides of the end face of each cell facing the bottom wall are respectively sealed with the partition 20. The battery pack is sealed and in contact with each other, and the pole 31 of each battery cell extends into the liquid storage channel 111. As a result, the partition 20, the bottom wall of the box, and the battery module 3 can form an independent liquid storage channel 111. The coolant in the liquid storage channel 111 will not leak into other areas of the battery pack, achieving dry and wet separation, ensuring that the components in the battery pack are compatible with the coolant. Because the coolant is confined to the partition 20, the coolant will not leak when repairing the components in the battery pack, ensuring the feasibility and convenience of repair. In addition, by forming the liquid storage channel 111, the coolant in the accommodating cavity is drained, improving the fluidity of the coolant and further improving the cooling effect on the pole 31 of the battery cell.

[0085] Furthermore, as shown in FIG3 , the partition 20 includes an annular outer partition 206 and multiple inner partitions 30. The multiple inner partitions 30 are arranged in the annular outer partition 206 at intervals along the second direction and extend along the first direction. The annular outer partition 206, the multiple inner partitions 30, and the bottom wall of the accommodating cavity form multiple liquid storage channels 111. The battery cell module 3 includes multiple rows of battery cells arranged along the second direction, each liquid storage channel 111 corresponds to a row of battery cells, and the second direction is perpendicular to the first direction. Thus, the annular outer partition 206 can confine the coolant to an independent area, prevent the coolant from leaking, and achieve dry and wet separation. The multiple liquid storage channels 111 formed by the multiple inner partitions 30 can guide the coolant to have better fluidity, thereby improving the heat exchange effect of the coolant. The multiple liquid storage channels 111 can achieve uniform cooling of multiple rows of battery cells, improve the temperature uniformity of the battery pack, and thus improve the performance and service life of the battery pack.

[0086] Optionally, the partition 20 can also be an annular plate extending along the first direction, and the inner cavity of the annular plate is a liquid storage channel 111. Specifically, a corresponding number of partitions 20 can be set according to the number of columns of battery cells. The liquid storage channel 111 of each partition 20 is used to cool the poles of a corresponding column of battery cells.

[0087] In some embodiments, each inner baffle 30 has a gap between its ends and the annular outer baffle 206. It is understood that due to the gap between the inner baffle 30 and the outer baffle, the multiple liquid storage channels 111 are interconnected. Therefore, only one water inlet 203 and one water outlet 204 need to be provided on the annular outer baffle 206 to meet the cooling liquid circulation needs within the multiple liquid storage channels 111. This eliminates the need to provide a corresponding water inlet 203 and water outlet 204 for each liquid storage channel 111, thereby reducing the number of pipeline layouts and the difficulty of manufacturing.

[0088] For example, as shown in Figure 3, the annular outer partition 206 includes a first end plate 201 and a second end plate 202 that are opposite to and spaced apart in a first direction, and the two ends of multiple inner partitions 30 are respectively connected to the first end plate 201 and the second end plate 202. A water inlet 203 can be set on the first end 71, and a water outlet 204 can be set on the second end plate 202. The coolant flowing in through the water inlet 203 can utilize the gap between the inner partition 30 and the annular outer partition 206 to supply liquid toward the multiple liquid storage channels 111, and then the coolant in all the liquid storage channels 111 can be concentrated and flowed out from the water outlet 204 after completing heat exchange.

[0089] Optionally, in other embodiments, both ends of the inner partition 30 are connected to the annular outer partition 206, and each liquid storage channel 111 is independent of each other. The annular outer partition 206 needs to be provided with a water inlet 203 and a water outlet 204 at both ends of each liquid storage channel 111 to realize liquid supply to each liquid storage channel 111.

[0090] Alternatively, in other embodiments, both ends of some inner baffles 30 are connected to the annular outer baffle 206, while both ends of another portion of inner baffles 30 are separated from the annular outer baffle 206. Thus, the multiple liquid storage channels 111 formed by the multiple inner baffles 30 include some interconnected liquid storage channels 111 and another portion of mutually independent liquid storage channels 111. For the interconnected liquid storage channels 111, a set of water inlets 203 and water outlets 204 communicating therewith may be provided on the annular outer baffle 206. For the mutually independent liquid storage channels 111, a water inlet 203 and water outlet 204 corresponding to each liquid storage channel 111 may be provided on the annular outer baffle 206.

[0091] Furthermore, as shown in FIG3 , a connecting tab 32 is connected to the end surface of each battery cell's pole 31 facing the bottom wall of the accommodating cavity, and at least a portion of the connecting tab 32 extends into the liquid reservoir channel 11. Thus, the coolant in the liquid reservoir channel 111 can directly cool not only the pole 31 but also the connecting tab 32. Compared to the traditional cooling method that uses a liquid cooling plate in contact with the connecting tab 32, immersion cooling can avoid the problem of misalignment between the liquid cooling plate and the connecting tab 32 caused by battery cell expansion or thermal runaway, thereby avoiding cooling failure or breakage of the connecting tab 32 due to assembly misalignment.

[0092] In addition, it should be noted that the connecting bar 32 can be completely immersed in the coolant or partially immersed in the coolant, which can be determined according to the layout of the connecting bar 32. For example, after the connecting bar 32 is connected to the pole 31, if the overall height of the connecting bar 32 is not higher than the end face of the pole 31 of the battery cell, the coolant will completely immerse the connecting bar 32 when cooling the pole 31. If part of the area of ​​the connecting bar 32 is higher than the end face of the pole 31 of the battery cell (for example, part of the structure of the connecting bar 32 protrudes between adjacent battery cells), the coolant will only immerse part of the area of ​​the connecting bar 32.

[0093] Optionally, the battery pack further includes a sealing strip 40, which is sandwiched between the partition 20 and the end face of the bottom wall of the battery cell facing the accommodating cavity. An explosion-proof valve 205 is also provided on the partition 20. The position and number of the explosion-proof valve 205 are not restricted, and timely pressure relief of the coolant area is sufficient.

[0094] Optionally, the seal between the separator 20 and the battery cell is not limited to a sealing strip interposed therebetween. For example, a sealing member may be provided on the outside of the contact area between the separator and the end surface of the battery cell, thereby achieving sealed contact between the separator 20 and the battery cell using an external sealing method. The specific sealing method can be selected according to needs and is not limited here.

[0095] Furthermore, the battery pack also includes a top liquid cooling plate 2 and a connecting pipe 6. The top liquid cooling plate 2 is connected to the opening of the accommodating cavity and contacts the end face of the battery cell module 3 facing away from the bottom wall. The connecting pipe 6 is connected between the top liquid cooling plate 2 and the liquid storage channel 111. Since the top liquid cooling plate 2 and the liquid storage channel 111 are connected through the connecting pipe 6, the top liquid cooling plate 2 and the liquid storage channel 111 only require one set of cooling pipe systems to complete the circulation of the coolant, thereby optimizing the pipe layout. It can be understood that after the battery cell module 3 is inverted in the accommodating cavity, the end face of the battery cell facing away from the bottom wall is facing the opening of the accommodating cavity. After assembly, the top liquid cooling plate 2 can just contact and exchange heat with the end face of the battery cell module 3 facing away from the bottom wall. The end face of the battery cell module 3 facing away from the bottom wall is a whole surface composed of the end faces of multiple battery cells facing away from the bottom wall.

[0096] Furthermore, an annular outer baffle 206 is provided with a water inlet 203 and a water outlet 204. Both ends of the multiple inner baffles 30 are spaced apart from the annular outer baffle 206. A connecting pipe 6 connects the top liquid cooling plate 2 to the water inlet 203. In other words, the multiple liquid storage channels formed by the inner baffles 30 are interconnected, requiring only one connecting pipe 6 to flow coolant through the water inlet 203 into the inner side of the annular outer baffle 206.

[0097] When both ends of the plurality of inner baffles 30 are connected to the annular outer baffle 206, since the plurality of liquid storage channels 111 are independent of each other, it is necessary to set a plurality of corresponding connecting pipes 6 according to the number of liquid storage channels 111.

[0098] In addition, when part of the multiple inner partitions 8 is separated from the annular outer partition 206 and the other part is connected to the annular outer partition 206, since some of the liquid storage channels 111 are connected and the other part of the liquid storage channels 111 are independent of each other, the connected liquid storage channels 111 can share a connecting pipeline 6, and each independent liquid storage channel 111 needs to be respectively provided with a corresponding connecting pipeline 6. In other words, the layout quantity of the connecting pipeline 6 can be determined according to the number and layout form of the liquid storage channels 111.

[0099] Furthermore, the battery pack also includes a liquid inlet line 4 and a liquid return line 5. The liquid inlet line 4 connects to the top liquid cooling plate 2 and one of the liquid storage channels 111, and the liquid return line 5 connects to the other of the top liquid cooling plate 2 and the liquid storage channels 111. Taking the connection between the liquid inlet line 4 and the top liquid cooling plate 2 as an example, the coolant can flow into the top liquid cooling plate 2 through the liquid inlet line 4 and exchange heat with the battery cells. After the heat exchange, the coolant can flow to the liquid storage channel 111 through the connecting line 6. The coolant in the liquid storage channel 111 can immerse the pole 31 to achieve direct cooling of the pole 31. The coolant after the heat exchange can flow out through the liquid return line 5 connected to the liquid storage channel 111, completing the cooling cycle.

[0100] Optionally, the liquid inlet pipeline 4 can also be connected to the liquid storage channel 111, and the return liquid pipeline 5 is connected to the top liquid cooling plate 2. The cooling liquid flows along the liquid inlet pipeline 4, the liquid storage channel 111, the connecting pipeline 6, the top liquid cooling plate 2 and the return liquid pipeline 5 to form a cooling cycle.

[0101] Furthermore, in the second direction, the connecting pipe 6 is located on one side of the battery cell module 3, and the liquid inlet pipe 4 and the liquid return pipe 5 are located on the other side of the battery cell module 3, and the liquid inlet pipe 4 and the liquid return pipe 5 are integrated into one. Taking the connection between the liquid inlet pipe 4 and the top liquid cooling plate 2 as an example, in this embodiment, the coolant can flow into the top liquid cooling plate 2 through the liquid inlet pipe 4 and fully flow and heat exchange along the length direction of the battery cell module 3, then flow into the liquid storage channel 111 away from the end of the liquid return pipe 5 through the connecting pipe 6, and then fully reflux and heat exchange along the length direction of the battery cell module 3 and flow out from the liquid return pipe 5, thereby maximizing the effective cooling stroke of the coolant. Moreover, since the liquid inlet pipe 4 and the liquid return pipe 5 are integrated into one, the structure is compact, the space occupied is small, and it is convenient to disassemble and assemble with the external pipes.

[0102] In some embodiments, the top liquid cooling plate 2 includes a cold plate body, an insulating coating and a flow channel plate. The flow channel plate has a flow channel. The cold plate body is buckled on the flow channel plate. The insulating coating is laid on the cold plate body. The top liquid cooling plate 2 and the battery cell module 3 are connected by thermal conductive glue 9.

[0103] Furthermore, as shown in Figure 10, the top liquid cooling plate 2 is provided with a water nozzle 10 extending vertically toward the box body 1, and the connecting pipe 6 is plugged into the water nozzle 10. The water nozzle 10 is connected to the liquid cooling flow channel in the top liquid cooling plate 2. The connecting pipe 6 and the water nozzle 10 are plugged into each other, which can quickly realize the disassembly and assembly of the connecting pipe 6.

[0104] In some embodiments, as shown in Figure 10, the connecting pipe 6 includes a straight section that is plugged into the water nozzle 10 and a bent section connected to the end of the straight section away from the water nozzle 10. The direction of the water outlet end of the bent section is generally consistent with the extension direction of the liquid storage channel 111, so that the coolant can be transported relatively smoothly between the top liquid cooling plate 2 and the bottom liquid cooling channel.

[0105] Optionally, as shown in FIG9 , the liquid inlet pipeline 4 and the liquid return pipeline 5 may also be constructed into a bent structure according to layout requirements, and the specific structural form is not limited.

[0106] The vehicle according to the embodiment of the present disclosure includes the battery pack according to the embodiment described above.

[0107] In one embodiment, a vehicle adopts the above-mentioned battery pack, wherein the battery module 3 includes at least one row of battery cells arranged along a first direction, the box body 1 has a receiving cavity, the bottom wall of the receiving cavity has a partition 20 protruding toward the battery module 3, the partition 20 and the bottom wall of the receiving cavity enclose at least one liquid storage channel 111, the liquid storage channel 111 extends along the first direction and is open toward the battery module 3, the battery module 3 is arranged in the receiving cavity, and the end face where the pole 31 of the battery cell is located faces the bottom wall of the receiving cavity, and the end face of each battery cell facing the bottom wall is respectively connected to the partition 20 on both sides. The plate 20 is in sealed contact, and the pole 31 of each battery cell extends into the liquid storage channel 111. As a result, the partition 20, the box body 1, and the battery cell module 3 can form an independent liquid storage channel 111. The coolant in the liquid storage channel 111 will not leak into other areas of the battery pack, achieving dry and wet separation, ensuring that the components in the battery pack are compatible with the coolant. Because the coolant is confined to the partition 20, the coolant will not leak when repairing the components in the battery pack, ensuring the feasibility and convenience of repair. In addition, by forming the liquid storage channel 111, the coolant in the accommodating cavity is drained, improving the fluidity of the coolant and further improving the cooling effect on the pole 31 of the battery cell.

[0108] In one embodiment, the vehicle adopts the above-mentioned battery pack, and the battery cell module 3 includes at least one column of battery cells arranged along the first direction, and a pull strip 8 is provided on the end face of the pole 31 of each column of battery cells, and the pull strip 8 extends along the first direction. The box body 1 has a accommodating cavity, and the battery cell module 3 is arranged in the accommodating cavity, and the end face of the pole 31 of the battery cell faces the bottom wall of the accommodating cavity. The pull strip 8 abuts against the bottom wall to form a liquid storage channel 111, and at least part of the pole 31 of the battery cell extends into the liquid storage channel 111. Therefore, the pull strip 8 provided on the end face of the battery cell can cooperate with the bottom surface of the battery cell and the bottom wall of the accommodating cavity to form the liquid storage channel 111, thereby having a drainage effect on the coolant in the accommodating cavity, improving the fluidity of the coolant, and further improving the cooling effect on the pole 31 of the battery cell.

[0109] At least some of the beneficial effects achieved by the vehicle of the embodiment of the present disclosure are the same as or similar to the beneficial effects achieved by the battery pack in the above-mentioned embodiment, so they will not be repeated here.

[0110] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0111] The foregoing are merely specific embodiments of the present disclosure, intended to enable those skilled in the art to understand and implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not to be limited to the embodiments described herein, but is to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack comprising: A battery cell module, the battery cell module comprising at least one column of battery cells arranged along a first direction, wherein a pull bar is provided on an end surface where a pole is provided, and the pull bar extends along the first direction; The box body has a accommodating cavity, the battery cell module is arranged in the accommodating cavity, and the end face of the battery cell pole is facing the bottom wall of the accommodating cavity, the pull strip abuts against the bottom wall to form a liquid storage channel in the accommodating cavity, and at least part of the battery cell pole extends into the liquid storage channel.

2. The battery pack according to claim 1, wherein two pull bars are provided on the end surface of each column of the battery cells where the poles are provided, and the two pull bars are respectively located on both sides of the end surface of the battery cells; And / or, the brace is a hollow structure; And / or, the bottom surface of the pull strip is in sealing contact with the bottom wall of the accommodating cavity.

3. The battery pack according to claim 1 or 2, wherein a reinforcing beam extending along the second direction is provided in the accommodating cavity, wherein both ends of the reinforcing beam are respectively connected to the inner wall of the accommodating cavity and an avoidance gap is formed between the reinforcing beam and the bottom wall, and the pull strip passes through the avoidance gap, and the second direction is perpendicular to the first direction.

4. The battery pack according to claim 3, a support column is provided between the reinforcing beam and the bottom wall, the pull bar includes a first pull bar opposite to the support column in the second direction, the first pull bar includes a front pull bar and a rear pull bar arranged at intervals in the first direction, and the support column is located between the front pull bar and the rear pull bar.

5. The battery pack according to any one of claims 1 to 4, wherein a connecting bar is connected to the end surface of the pole of each battery cell facing the bottom wall, and the connecting bar is used to connect multiple poles of the same column of battery cells, and at least a portion of the connecting bar extends into the liquid storage channel.

6. The battery pack according to any one of claims 1-5, wherein the battery cell module further comprises an end tab, wherein the end tab is connected between different columns of battery cells and is located at the end of the battery cell module in the first direction, and the pull bar comprises a second pull bar opposite to the end tab in the second direction, and the orthographic projection of the end tab on the battery cell module is located outside the orthographic projection of the second pull bar on the battery cell module.

7. The battery pack according to any one of claims 2 to 6, wherein a buffer is provided between the pull bar and the bottom wall.

8. The battery pack according to any one of claims 1-7, further comprising a top liquid cooling plate and a connecting pipe, wherein the top liquid cooling plate is connected to the opening of the accommodating cavity and contacts the end surface of the battery cell module facing away from the bottom wall, and one end of the connecting pipe is connected to the top liquid cooling plate, and the other end extends into the accommodating cavity. 9 . The battery pack according to claim 8 , further comprising a liquid inlet pipeline and a liquid return pipeline, wherein the liquid inlet pipeline is connected to the top liquid cooling plate, and the liquid return pipeline is connected to the accommodating cavity.

10. A battery pack comprising: A battery cell module, the battery cell module comprising at least one row of battery cells arranged along a first direction; A box body, the box body having a accommodating cavity, the bottom wall of the accommodating cavity having a partition protruding toward the battery cell module, the partition and the bottom wall of the accommodating cavity enclosing at least one liquid storage channel, the liquid storage channel extending along the first direction and opening toward the battery cell module; In which, the battery cell module is arranged in the accommodating cavity, and the end face of the battery cell where the pole is located faces the bottom wall of the accommodating cavity, and the two sides of the end face of each battery cell facing the bottom wall are respectively in sealing contact with the partition, and the pole of each battery cell extends into the liquid storage channel.

11. The battery pack according to claim 10, wherein the partition comprises an annular outer partition and multiple inner partitions, the multiple inner partitions are arranged in the annular outer partition at intervals along the second direction and extend along the first direction, the annular outer partition, the multiple inner partitions and the bottom wall of the accommodating cavity form multiple liquid storage channels, the battery cell module comprises multiple rows of battery cells arranged along the second direction, each of the liquid storage channels corresponds to a row of the battery cells, and the second direction is perpendicular to the first direction. 12 . The battery pack according to claim 11 , wherein a gap is formed between both ends of each inner separator and the annular outer separator. 13 . The battery pack according to claim 10 , further comprising a sealing strip, wherein the sealing strip is sandwiched between the partition and an end surface of the battery cell facing the bottom wall of the accommodating cavity.

14. The battery pack according to any one of claims 10 to 13, wherein a connecting bar is further connected to the end surface of the pole of each battery cell facing the bottom wall of the accommodating cavity, and at least a portion of the connecting bar extends into the liquid storage channel.

15. The battery pack according to any one of claims 10-14, further comprising a top liquid cooling plate and a connecting pipe, wherein the top liquid cooling plate is connected at the opening of the accommodating cavity and contacts the end surface of the battery cell module facing away from the bottom wall, and the connecting pipe is connected between the top liquid cooling plate and the liquid storage channel.

16. The battery pack according to claim 15, wherein a water inlet and a water outlet are provided on the annular outer partition, both ends of the plurality of inner partitions are spaced apart from the annular outer partition, and the top liquid cooling plate is connected to the water inlet via a connecting pipe.

17. The battery pack according to claim 16, further comprising a liquid inlet pipeline and a liquid return pipeline, wherein the liquid inlet pipeline is connected to the top liquid cooling plate and one of the liquid storage channels, and the liquid return pipeline is connected to the top liquid cooling plate and the other of the liquid storage channels, and the liquid inlet pipeline and the liquid return pipeline are integrated into one. 18 . The battery pack according to claim 17 , wherein in the first direction, the communication pipeline is located on one side of the battery cell module, and the liquid inlet pipeline and the liquid return pipeline are located on the other side of the battery cell module.

19. A vehicle comprising the battery pack according to any one of claims 1 to 18.

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