Battery module and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery module and a battery pack, and the battery module comprises a first bracket and a second bracket which are oppositely arranged at an interval, a plurality of battery cells and a module shell. According to the present invention, the module internal immersion cooling mode is adopted, and the cooling liquid is only filled into the module shell, such that the use amount of the cooling liquid can be significantly reduced compared with the mode of filling the battery pack shell with the cooling liquid so as to reduce the total weight of the battery pack, such that the lightweight of the battery pack can be easily achieved, and the lightweight requirement of the high-performance electric vehicle can be met. Meanwhile, the cooling liquid circulates in the module shell with a relatively small volume, so that the pressure on the battery pack shell can be reduced, and the deformation of the battery pack shell is prevented. And when the whole vehicle runs at a normal speed, the battery cell is cooled by the cooling liquid immersed in the module shell, so that the use cost can be reduced. The battery modules are assembled into the battery pack, and cooling liquid enters and exits from each module independently, so that mutual influence of heat among the modules can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery module and a battery pack. Background Art

[0002] For high-performance electric vehicle models, the batteries rapidly heat up under emergency acceleration conditions, and conventional heat dissipation methods cannot meet the heat dissipation requirements of the batteries. In existing battery terminals, the whole battery pack is immersed in a coolant to cool the battery cells, so as to improve the cooling effect of the battery cells. However, the whole-pack immersion cooling method uses a large amount of coolant and the overall weight of the battery pack is large; and when the coolant cools and circulates, the battery pack housing bears a large pressure, resulting in a large deformation of the battery pack housing. Summary of the Invention

[0003] In view of this, the present invention provides a battery module and a battery pack to solve the problems in the prior art that the whole-pack immersion cooling of the battery pack causes the large weight of the battery pack and the easy deformation of the housing.

[0004] In a first aspect, the present invention provides a battery module, including:

[0005] A first bracket and a second bracket that are opposite and spaced apart, a channel being formed between the first bracket and the second bracket;

[0006] A plurality of battery cells, two ends of each battery cell being respectively disposed on the first bracket and the second bracket to form a module assembly; the plurality of battery cells are arranged in rows up and down, and a flow channel gap is provided between the upper and lower rows of battery cells;

[0007] A module housing, provided with a liquid inlet and a liquid outlet, the module housing having a closed liquid storage cavity; the liquid inlet and the liquid outlet are disposed on the side walls of the module housing at both ends in the length direction of the battery module; the module assembly is disposed inside the module housing.

[0008] Beneficial effects: In the battery module with this structure, the coolant enters the interior of the module housing from the liquid inlet, then flows through the channel between the first bracket and the second bracket to the battery cells, and then flows through the flow channel gaps between the upper and lower rows of battery cells to the battery cells near the liquid outlet direction. Finally, the coolant flows out of the module housing from the liquid outlet. When the battery module is applied in the battery pack of a high-performance electric vehicle, it can effectively reduce the temperature of the battery cells under the condition of rapid acceleration, meeting the heat dissipation requirements of high-performance electric vehicles. By adopting the internal immersion cooling method of the module, only the coolant is filled in the interior of the module housing. Compared with the method of filling the coolant in the battery pack housing, the usage amount of the coolant can be significantly reduced, thereby reducing the overall weight of the battery pack, which is beneficial to the lightweight of the battery pack and enables it to meet the lightweight requirements of high-performance electric vehicles. At the same time, the coolant circulates in the relatively small module housing, and the coolant is dispersed in each module housing, which can reduce the pressure on the battery pack housing and prevent the deformation of the battery pack housing. When the vehicle is driving at a normal speed, the heat generated by the battery cells is relatively small, and there is no need to turn on the circulating cooling of the coolant. Relying on the coolant immersed in the interior of the module housing to cool the battery cells can reduce the usage cost. When the battery modules are assembled into a battery pack, the coolant enters and exits each module independently, which can avoid the mutual influence of heat between the modules, is beneficial to improving the heat dissipation effect of the battery module, and ensures the temperature uniformity of each module. The battery module cancels the cold plate structure, simplifying the structure.

[0009] In an optional embodiment, the battery cell includes a cylindrical battery cell with a diameter of D, and the width of the flow channel gap is W1, where 0.02D ≤ W1 ≤ 0.2D.

[0010] Beneficial effects: 0.02D ≤ W1. Such a setting can prevent the flow channel gap from being too narrow, ensuring the smooth passage of the coolant through the flow channel gap and guaranteeing the circulation cooling effect of the coolant. At the same time, W1 ≤ 0.2D. Such a setting can avoid the reduction of the energy density of the battery module due to the over-large flow channel gap, which is beneficial to ensuring the energy density of the battery module.

[0011] In an optional embodiment, a non-flow channel gap is provided between adjacent battery cells in each row of the battery cells, and the width of the non-flow channel gap is W2, where 0.02D ≤ W2 ≤ 0.1D.

[0012] Beneficial effects: A non-flow channel gap is provided between adjacent battery cells in each row of the battery cells, and 0.02D ≤ W2, which can ensure the width of the non-flow channel gap, facilitating the filling of the non-flow channel gap with the coolant so that the coolant can fully contact the outer peripheral wall of the cylindrical battery cell, improving the heat dissipation effect on the cylindrical battery cell. At the same time, W2 ≤ 0.1D can prevent the reduction of the volume energy density of the battery module and the battery pack due to the over-wide width of the non-flow channel gap.

[0013] In an alternative embodiment, the number of the battery cells arranged horizontally along the length direction of the battery module is N, where N ≤ 10.

[0014] Beneficial effects: This can prevent the coolant flow path from being too long, ensure the heat dissipation effect on all the battery cells in the module, reduce the temperature difference between the front and rear battery cells in each row, and improve the temperature uniformity of the battery cells in the module.

[0015] In an alternative embodiment, it further includes a module cover plate and a busbar assembly. The module cover plate is provided with a positive output terminal and a negative output terminal; an opening is provided at the top of the module housing, and the module cover plate is arranged on the opening and encloses the liquid storage cavity with the module housing; one end of the busbar assembly is electrically connected to the battery cells, and the other end is electrically connected to the positive output terminal and the negative output terminal.

[0016] In an alternative embodiment, a plurality of mounting grooves are provided on the first bracket and the second bracket. The two ends of the battery cell are respectively inserted into the mounting grooves on its two sides. The two end faces of the battery cell are respectively provided with a positive electrode and a negative electrode, and the positive electrode and the negative electrode extend out of the mounting groove, and the positive electrodes and negative electrodes of the battery cells in the same row are arranged alternately; the busbar assembly includes a busbar and a conductive sheet. The conductive sheet electrically connects the positive electrodes and negative electrodes of the horizontally arranged and adjacent battery cells in the same row. The busbar electrically connects the conductive sheets of each row, the positive electrodes of each row and the negative electrodes of each row, and the busbar is electrically connected to the positive output terminal and the negative output terminal.

[0017] In an alternative embodiment, it further includes an insulating cover plate, and the insulating cover plate covers the busbar and the conductive sheet.

[0018] In an alternative embodiment, the liquid inlet is arranged in the lower area of the side wall of the module housing, and the liquid outlet is arranged in the upper area of the side wall of the module housing.

[0019] Beneficial effects: Such an arrangement facilitates the coolant to enter from the lower area of the module housing and then flow out from the upper part of the module housing, facilitating the coolant to fill the module housing from bottom to top and ensuring the cooling effect.

[0020] In a second aspect, the present invention further provides a battery pack, including:

[0021] A battery pack housing;

[0022] A plurality of battery modules according to any one of the above embodiments, and the battery modules are arranged in the battery pack housing;

[0023] A total liquid inlet pipe, which communicates with all the liquid inlets;

[0024] The total liquid outlet pipe is connected to all the liquid outlet ports. The battery pack includes battery modules, which have the same technical effects as the battery modules and will not be elaborated here.

[0025] In an optional embodiment, a battery management system is further included. A plurality of the battery modules are arranged in a row, and the battery management system is disposed on the side of the battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Schematic diagram of a battery module according to an embodiment of the present invention;

[0028] Figure 2 For Figure 1 exploded view of the battery module shown;

[0029] Figure 3 For Figure 1 schematic diagram of the battery module after removing the module housing;

[0030] Figure 4 For Figure 1 exploded view of the battery module including battery cells, the first bracket, the second bracket, the busbar assembly, and the insulation cover plate;

[0031] Figure 5 For Figure 1 schematic diagram of the battery module after the battery cells, the first bracket, the second bracket, the busbar assembly, and the insulation cover plate are assembled;

[0032] Figure 6 For Figure 5 schematic diagram after removing the insulation cover plate;

[0033] Figure 7 For Figure 1 flow diagram of the coolant inside the battery module shown;

[0034] Figure 8 For Figure 1 schematic diagram of the cooperation between the first bracket and the battery cells in the battery module shown;

[0035] Figure 9 Schematic diagram of the cooperation of multiple battery modules;

[0036] Figure 10Schematic diagram of a battery pack after removing the upper housing according to an embodiment of the present invention;

[0037] Figure 11 Schematic diagram of a battery pack according to an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Battery module; 11. First bracket; 1101. Installation groove; 12. Second bracket; 13. Battery cell; 1301. Positive electrode; 1302. Negative electrode; 14. Flow channel gap; 15. Module housing; 16. Module inlet pipe; 17. Module outlet pipe; 18. Non-flow channel gap; 19. Module cover plate; 1901. Positive output pole; 1902. Negative output pole; 1903. Low-voltage acquisition port; 110. Busbar assembly; 11001. Busbar; 11002. Conductive sheet; 111. Insulating cover plate; 2. Battery pack housing; 3. Total inlet pipe; 4. Total outlet pipe; 5. Battery management system. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] The battery pack in the related art includes a battery pack housing 2 and a plurality of battery modules 1. The battery modules 1 are arranged in the battery housing. The battery pack cools the battery cells 13 in a way of whole-pack immersion cooling, that is, by introducing a coolant into the battery pack housing 2 to make the battery cells 13 in the battery modules 1 directly contact the coolant, so as to improve the cooling effect of the battery cells 13. The whole-pack immersion cooling method has a large consumption of coolant and a large overall weight of the battery pack; and when the coolant cools and circulates, the battery pack housing 2 bears a large pressure, resulting in a large deformation of the battery pack housing 2.

[0042] The following combines Figures 1 to 11 to describe the embodiments of the present invention.

[0043] According to an embodiment of the present invention, on the one hand, a battery module 1 is provided, which includes a first bracket 11 and a second bracket 12 that are opposite and spaced apart, a plurality of battery cells 13 and a module housing 15.

[0044] Among them, a channel is formed between the first bracket 11 and the second bracket 12; both ends of the battery cell 13 are respectively arranged on the first bracket 11 and the second bracket 12 to form a module assembly; multiple battery cells 13 are arranged in rows up and down, and a flow channel gap 14 is provided between the upper and lower rows of battery cells 13; a liquid inlet and a liquid outlet are provided on the module housing 15, and the module housing 15 has a closed liquid storage cavity; the liquid inlet and the liquid outlet are arranged on the side walls of the module housing 15 at both ends in the length direction of the flow battery module; the module assembly is arranged inside the module housing 15.

[0045] For the battery module 1 with this structure, the coolant enters the inside of the module housing 15 from the liquid inlet, then flows through the channel between the first bracket 11 and the second bracket 12 to the battery cell 13, and then flows through the flow channel gap 14 between the upper and lower rows of battery cells 13 to the battery cell 13 near the liquid outlet direction. Finally, the coolant flows out of the module housing 15 from the liquid outlet. The battery module 1 is applied in the battery pack of a high-performance electric vehicle. Under the condition of rapid acceleration, it can effectively reduce the temperature of the battery cell 13 and meet the heat dissipation requirements of the high-performance electric vehicle. By adopting the internal immersion cooling method of the module, only the coolant is filled inside the module housing 15. Compared with the method of filling the coolant in the battery pack housing 2, the usage amount of the coolant can be significantly reduced, thereby reducing the overall weight of the battery pack, which is beneficial to the lightweight of the battery pack and enables it to meet the lightweight requirements of the high-performance electric vehicle. At the same time, the coolant circulates inside the module housing 15 with a relatively small volume, and the coolant is dispersed in each module housing 15, which can reduce the pressure on the battery pack housing 2 and prevent the battery pack housing 2 from deforming. When the vehicle is driving at a normal speed, the heat generated by the battery cell 13 is relatively small, and there is no need to start the circulating cooling of the coolant. Relying on the coolant immersed inside the module housing 15 to cool the battery cell 13 can reduce the usage cost. The battery modules 1 are assembled into a battery pack, and the coolant independently enters and exits each module, which can avoid the mutual influence of heat between the modules and is beneficial to improving the heat dissipation effect of the battery module 1 and ensuring the temperature uniformity of each module. The battery module 1 cancels the cold plate structure and simplifies the structure.

[0046] As Figure 7 shown, in some embodiments, the battery cell 13 includes a cylindrical battery cell, the diameter of the cylindrical battery cell is D, and the width of the flow channel gap 14 is W1, where 0.02D ≤ W1 ≤ 0.2D. The battery cell 13 includes a cylindrical battery cell, and both axial ends of the cylindrical battery cell are respectively arranged on the first bracket 11 and the second bracket 12, and the coolant flows along the radial direction of the cylindrical battery cell along the flow channel gap 14. 0.02D ≤ W1 is set to prevent the flow channel gap 14 from being too narrow, ensuring the smooth passage of the coolant through the flow channel gap 14 and guaranteeing the circulation cooling effect of the coolant; at the same time, W1 ≤ 0.2D is set to avoid the reduction of the energy density of the battery module 1 due to the excessive flow channel gap 14, which is beneficial to ensuring the energy density of the battery module 1.

[0047] As Figure 7As shown, a non-flow channel gap 18 is provided between adjacent battery cells 13 of each row of battery cells 13. The width of the non-flow channel gap 18 is W2, and 0.02D ≤ W2 ≤ 0.1D. A non-flow channel gap 18 is provided between adjacent battery cells 13 of each row of battery cells 13, and 0.02D ≤ W2, which can ensure the width of the non-flow channel gap 18, facilitate the coolant to fill the non-flow channel gap 18, so that the coolant can fully contact the outer peripheral wall of the cylindrical battery cell, and can improve the heat dissipation effect on the cylindrical battery cell. At the same time, W2 ≤ 0.1D can prevent the volume energy density of the battery module 1 and the battery pack from being reduced due to the over-wide width of the non-flow channel gap 18.

[0048] As Figure 7 shown, the number of battery cells 13 in each row arranged horizontally along the length direction of the battery module is N, and N ≤ 10. After the coolant enters the module housing 15, it flows through multiple battery cells 13 of each row of battery cells 13 along the length direction of the module housing 15. The temperature of the coolant flowing to the rear side will increase after heat exchange. If the number of battery cells 13 in each row is too large and the flow path of the coolant is long, it is difficult to ensure the heat dissipation effect of the battery cells 13 near the rear side. To avoid this problem, in some embodiments, the number of battery cells 13 in each row N ≤ 10, which can prevent the flow path of the coolant from being too long, ensure the heat dissipation effect on all battery cells 13 in the module, reduce the temperature difference between the front and rear battery cells 13 in each row, and improve the temperature uniformity of the battery cells 13 in the module.

[0049] In some embodiments, the axial height of the cylindrical battery cell is H, and H ≤ 100 mm.

[0050] In some embodiments, as Figure 2 and Figure 3 shown, the battery module 1 further includes a module cover plate 19 and a busbar assembly 110. A positive output terminal 1901 and a negative output terminal 1902 are provided on the module cover plate 19; an opening is provided at the top of the module housing 15, and the module cover plate 19 is arranged on the opening and encloses a liquid storage cavity with the module housing 15; one end of the busbar assembly 110 is electrically connected to the battery cell 13, and the other end is electrically connected to the positive output terminal 1901 and the negative output terminal 1902. All the battery cells 13 are electrically connected through the busbar assembly 110, and the energy of the battery cells 13 is output to the positive output terminal 1901 and the negative output terminal 1902 through the busbar assembly 110.

[0051] In some embodiments, the module cover plate 19 is welded to the module housing 15 at the outer edge of the opening, thereby ensuring the sealing performance and preventing the liquid storage cavity from leaking.

[0052] As Figure 1As shown, in some alternative embodiments, the module housing 15 is a square housing, which has a long side, a wide side, and a high side. The opening is provided at the top of the module housing 15, and the positive output terminal 1901 and the negative output terminal 1902 are arranged at intervals along the length direction of the module cover plate 19. The liquid inlet is provided on the right side wall of the module housing 15, and the liquid outlet is provided on the left side wall of the module housing 15. The battery cells 13 are assembled onto the first bracket 11 and the second bracket 12, and then the output terminals of all the battery cells 13 are connected through the busbar assembly 110 to form a module assembly. Then, the module assembly is placed inside the module housing 15, and the side surfaces and the bottom surfaces of the first bracket 11 and the second bracket 12 are coated with structural adhesive to bond them to the module housing 15, which can ensure the structural strength of the battery module 1.

[0053] As Figure 3 and Figure 8 shown, in some embodiments, the first bracket 11 and the second bracket 12 are provided with a plurality of mounting grooves 1101. The two ends of the battery cell 13 are respectively inserted into the mounting grooves 1101 on both sides thereof. The positive electrode 1301 and the negative electrode 1302 are respectively provided on the end faces of the two ends of the battery cell 13. The positive electrode 1301 and the negative electrode 1302 extend out of the mounting groove 1101, and the positive electrodes 1301 and the negative electrodes 1302 of the battery cells 13 in the same row are staggered; the busbar assembly 110 includes a busbar 11001 and a conductive sheet 11002. The conductive sheet 11002 electrically connects the positive electrodes 1301 and the negative electrodes 1302 of the battery cells 13 in the same row that are horizontally arranged and adjacent to each other. The busbar 11001 electrically connects the conductive sheets 11002 in each row, the positive electrodes 1301 in each row, and the negative electrodes 1302 in each row. The busbar 11001 is electrically connected to the positive output terminal 1901 and the negative output terminal 1902. The conductive sheet 11002 connects the battery cells 13 in series, and the busbar 11001 connects the battery cells 13 in parallel. The positive electrodes 1301 and the negative electrodes 1302 of the battery cells 13 in the same row are staggered, that is, in each row of two adjacent battery cells 13, for example, the positive electrode 1301 of the left battery cell 13 faces the front end in the width direction of the battery module 1, and the positive electrode 1301 of the right battery cell 13 faces the rear end in the width direction of the battery module 1. Such a setting facilitates connecting all the battery cells 13 through the busbar 11001 and the conductive members.

[0054] In some embodiments, glue is coated on the battery cell 13 to bond and fix it to the mounting groove 1101.

[0055] As Figure 3 shown, there are a plurality of busbars 11001. The busbars 11001 extend along the height direction of the first bracket 11. The plurality of busbars 11001 are arranged at intervals. The top of the busbar 11001 is provided with a bending portion, and the bending portion is welded to the positive output terminal 1901 and the negative output terminal 1902.

[0056] Optionally, the conductive sheet 11002 is welded to the pole post of the battery cell 13 and the bus bar 11001.

[0057] As Figure 7 shown, in some embodiments, the upper and lower rows of battery cells 13 are arranged with left - right dislocation, that is, the battery cells 13 in the lower row are located below the recessed area surrounded by the two upper battery cells 13, and the upper and lower battery cells 13 are not aligned. Such an arrangement can make full use of space, improve the volume energy density of the battery module 1 and the battery pack, and is conducive to the miniaturization of the battery module 1 and the battery pack. A flow channel gap 14 is formed between the outer peripheral walls of the upper and lower battery cells 13.

[0058] As Figure 4 and Figure 5 shown, in some embodiments, the battery module 1 further includes an insulating cover plate 111, and the insulating cover plate 111 covers the bus bar 11001 and the conductive sheet 11002, and the insulating cover plate 111 plays a protective role for the bus bar 11001 and the conductive sheet 11002.

[0059] As Figure 1 shown, in some embodiments, the liquid inlet is arranged in the lower region of the side wall of the module housing 15, and the liquid outlet is arranged in the upper region of the side wall of the module housing 15. Such an arrangement facilitates the coolant to enter from the lower region of the module housing 15 and then flow out from the upper part of the module housing 15, and it is convenient for the coolant to fill the module housing 15 from bottom to top, which can ensure the cooling effect.

[0060] In some embodiments, the height of the liquid outlet is higher than the height of the top row of battery cells 13 in the module, so as to ensure that the coolant submerges all the battery cells 13 and improve the cooling effect.

[0061] In some embodiments, the height of the liquid inlet is less than 40% of the height of the battery module 1.

[0062] As Figure 1 shown, in some embodiments, the battery module 1 includes a module liquid inlet pipe 16 and a module liquid outlet pipe 17. The module liquid inlet pipe 16 is communicated with the liquid inlet, and the module liquid outlet pipe 17 is communicated with the liquid outlet.

[0063] As Figure 1 shown, in some embodiments, a low - voltage acquisition port 1903 is further provided on the module cover plate 19, and information such as the voltage and temperature of the battery cell 13 is acquired through the low - voltage acquisition port 1903.

[0064] Threaded holes are provided on the positive - electrode output pole 1901 and the negative - electrode output pole 1902. As Figure 9 shown, the output poles of adjacent battery modules 1 are connected by a copper bar, and the copper bar is fixed to the positive - electrode output pole 1901 or the negative - electrode output pole 1902 through fasteners and threaded holes.

[0065] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, which includes a battery pack housing 2, a plurality of the above-mentioned battery modules 1, a total liquid inlet pipe 3 and a total liquid outlet pipe 4. The battery modules 1 are arranged inside the battery pack housing 2; the total liquid inlet pipe 3 is communicated with all the liquid inlet ports; the total liquid outlet pipe 4 is communicated with all the liquid outlet ports.

[0066] For the battery pack with this structure, when the heat generated by the battery cells 13 is relatively large and the coolant circulation cooling needs to be started, the coolant enters through the liquid inlet pipe and then enters the inside of the module housing 15 through the liquid inlet port. After the coolant exchanges heat with the battery cells 13, it flows out of the battery pack through the liquid outlet port and the total liquid outlet pipe 4, realizing the circulation of the coolant. By adopting the internal immersion cooling method in the module and only filling the coolant inside the module housing 15, the usage amount of the coolant can be significantly reduced, thereby reducing the overall weight of the battery pack, being beneficial to the lightweight of the battery pack, and enabling it to meet the lightweight requirements of high-performance electric vehicles. At the same time, the coolant circulates inside the module housing 15 with a relatively small volume, and the coolant is dispersed in each module housing 15, which can reduce the pressure on the battery pack housing 2 and prevent the battery pack housing 2 from deforming. When the vehicle is driving at a normal speed, the heat generated by the battery cells 13 is relatively small, and there is no need to start the coolant circulation cooling. Relying on the coolant immersed inside the module housing 15 to cool the battery cells 13 can reduce the usage cost. The battery modules 1 are assembled into a battery pack, and the coolant independently enters and exits each module internally, which can avoid the mutual influence of heat between modules, being beneficial to improving the heat dissipation effect of the battery modules 1 and ensuring the temperature uniformity of each module inside the battery pack.

[0067] As Figure 9 and Figure 10 shown, all the battery modules 1 are arranged in a row, the ends of the module liquid inlet pipes 16 of all the battery modules 1 are flush, the ends of the module liquid outlet pipes 17 of all the battery modules 1 are flush, the total liquid inlet pipe 3 is sequentially communicated with each module liquid inlet pipe 16, and the total liquid outlet pipe 4 is sequentially communicated with each module liquid outlet pipe 17.

[0068] In order to reduce the weight of the battery pack, the total weight of all the coolant in the battery pack is controlled to be less than 1.5 times the total weight of the battery cells 13.

[0069] As Figure 11 shown, in some embodiments, the battery housing includes a lower housing and an upper housing. The battery module 1 is arranged inside the lower housing, and the upper housing covers the outside of the battery module 1.

[0070] In some embodiments, the battery pack further includes a battery management system 5. A plurality of battery modules 1 are arranged in a row, and the battery management system 5 is arranged on the side of the battery modules 1. Such an arrangement can make full use of the space on the side of the battery modules 1 to install the battery management system 5, save space, and make the battery pack structure compact.

[0071] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery module, characterized in that: include: A first bracket and a second bracket are arranged opposite to each other and spaced apart, and a channel is formed between the first bracket and the second bracket; A plurality of battery cells, wherein two ends of the battery cells are respectively arranged on the first bracket and the second bracket to form a module assembly; the plurality of battery cells are arranged in rows up and down, and a flow channel gap is provided between the battery cells in each row up and down; The module shell is provided with a liquid inlet and a liquid outlet, and the module shell has a closed liquid storage cavity; the liquid inlet and the liquid outlet are arranged on the side walls of the module shell at both ends of the length direction of the battery module; the module assembly is arranged in the module shell.

2. The battery module according to claim 1, characterized in that: The battery core comprises a cylindrical battery core, the diameter of the cylindrical battery core is D, the width of the flow channel gap is W1, and 0.02D≤W1≤0.2D.

3. The battery module according to claim 2, characterized in that: A non-flow channel gap is provided between adjacent battery cells in each row of the battery cells, and the width of the non-flow channel gap is W2, 0.02D≤W2≤0.1D.

4. The battery module according to any one of claims 1 to 3, characterized in that: The number of the battery cells in each row horizontally arranged along the length direction of the battery module is N, where N≤10.

5. The battery module according to any one of claims 1 to 3, characterized in that: It also includes a module cover and a busbar assembly, wherein the module cover is provided with a positive output pole and a negative output pole; an opening is provided on the top of the module shell, the module cover is arranged on the opening and forms the liquid storage cavity with the module shell; one end of the busbar assembly is electrically connected to the battery cell, and the other end is electrically connected to the positive output pole and the negative output pole.

6. The battery module according to claim 5, characterized in that: The first bracket and the second bracket are provided with a plurality of mounting grooves, the two ends of the battery cell are respectively inserted into the mounting grooves on both sides thereof, the positive pole and the negative pole are respectively provided on the end faces of the two ends of the battery cell, the positive pole and the negative pole extend outward from the mounting grooves, and the positive pole and the negative pole of the battery cells in the same row are arranged alternately; the bus assembly comprises a bus bar and a conductive sheet, the conductive sheet electrically connects the positive pole and the negative pole of the battery cells in the same row and adjacent to each other in a horizontal arrangement, the bus bar electrically connects the conductive sheets of each row, the positive poles of each row and the negative poles of each row, and the bus bar is electrically connected to the positive output pole and the negative output pole.

7. The battery module according to claim 6, characterized in that: It also includes an insulating cover plate, which is arranged outside the bus bar and the conductive sheet.

8. The battery module according to any one of claims 1 to 3, characterized in that: The liquid inlet is arranged at the lower area of ​​the side wall of the module shell, and the liquid outlet is arranged at the upper area of ​​the side wall of the module shell.

9. A battery pack, characterized in that: include: Battery pack housing; A battery module according to any one of claims 1 to 8, wherein the battery module is disposed in the battery pack housing; A main liquid inlet pipe, connected to all the liquid inlets; The main liquid outlet pipe is connected to all the liquid outlets.

10. The battery pack according to claim 9, characterized in that: It also includes a battery management system. A plurality of the battery modules are arranged in a row, and the battery management system is disposed on the side of the battery module.

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