Battery pack and battery system

Abstract

The utility model relates to a battery pack and a battery system. A battery pack in the battery pack is provided with a first main channel and a plurality of battery cell branch channels; the first main channel is respectively communicated with each battery cell branch channel; the box body is provided with a first accommodating cavity and a first opening; the first accommodating cavity is used for accommodating the battery pack; the cover body is arranged at the first opening, a second main path channel is arranged on the first surface of the cover body, the second main path channel is adjacent to the first main path channel, and the second main path channel is communicated with the first main path channel, so that the flowing distribution of the cooling liquid in the box body is realized. According to the battery pack, the second main path channel is formed in the cover body, after cooling liquid enters the second main path channel of the cover body, the cooling liquid can rapidly enter the first main path channel based on gravity, and then the cooling liquid is rapidly distributed to each battery cell branch path channel through the first main path channel, so that cooling and heat dissipation of each single battery cell in the battery pack are realized; the flow rate of the cooling liquid and the temperature consistency of the battery are improved, and the heat dissipation effect of the battery is good.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and a battery system. Background Art

[0002] With the development of battery technology, battery application scenarios are becoming more and more extensive, and higher requirements are also placed on the thermal management performance of batteries. The cooling methods of battery packs include air cooling and liquid cooling. The liquid cooling method can be divided into immersion cooling and liquid cooling plate conduction cooling. The immersion cooling battery pack completely immerses the battery and other heat-generating components in the cooling liquid to achieve rapid cooling.

[0003] In the prior art, the cooling liquid flow distribution pathway for immersion-cooled battery packs is complex and the cooling liquid flow rate is low, resulting in poor temperature consistency of the batteries in the battery pack and poor heat dissipation effect of the batteries. Utility Model Content

[0004] Based on this, it is necessary to provide a battery pack and battery system that can optimize the flow distribution path of the cooling liquid in the battery pack, increase the flow rate of the cooling liquid, improve the temperature consistency of the batteries in the battery pack, and have good battery heat dissipation effect in order to address the problems existing in the above-mentioned existing battery packs.

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] A battery pack, wherein the battery pack is provided with a first main channel and a plurality of battery cell branch channels, wherein the first main channel is connected to each battery cell branch channel respectively;

[0007] A box body, wherein the box body is provided with a first accommodating cavity and a first opening, and the first accommodating cavity is used to accommodate the battery pack;

[0008] The cover body is arranged at the first opening, the first surface of the cover body is provided with a second main channel, the second main channel is adjacent to the first main channel, and the second main channel is communicated with the first main channel.

[0009] In one embodiment, at least one beam is disposed on the first surface of the cover body, and the beam and the first surface of the cover body are enclosed to form a second main channel;

[0010] The beam body is provided with a plurality of first through holes arranged at intervals, and the second main channel is connected to the first main channel through each of the first through holes.

[0011] In one of the embodiments, a second through hole is disposed on the second surface of the cover body, and the second through hole is communicated with the second main channel.

[0012] In one embodiment, the second main channel is located above the first main channel, and the length of the second main channel is less than or equal to the length of the first main channel.

[0013] In one embodiment, the battery pack includes at least two battery modules, two adjacent battery modules are arranged at intervals, and a side sealing plate group is arranged between the two adjacent battery modules;

[0014] Two adjacent battery modules and corresponding side sealing plate groups are enclosed to form a first main channel.

[0015] In one embodiment, the battery module includes a first end plate, a second end plate and a plurality of spaced-apart single cells, each of which is disposed between the first end plate and the second end plate, and a cell branch channel is formed between two adjacent single cells in the same battery module; the side sealing plate group includes a first side sealing plate and a second side sealing plate;

[0016] A first side sealing plate is arranged between two adjacent first end plates, and a second side sealing plate is arranged between two adjacent second end plates.

[0017] In one of the embodiments, a first bracket is provided on the battery module;

[0018] A beam body is arranged between two adjacent first brackets.

[0019] In one of the embodiments, the battery pack further includes a sealant, which is disposed between two adjacent first brackets to seal a gap between the beam body and the corresponding two adjacent first brackets.

[0020] In one embodiment, the sealing member is provided with a plurality of third through holes, and each of the third through holes is connected to each of the first through holes in a one-to-one correspondence.

[0021] In one embodiment, the sealing member is an elastic sealing member.

[0022] In one embodiment, an isolation component is provided between two adjacent single cells in the same battery module, and the isolation component divides the corresponding cell branch channel into a plurality of branch sub-channels;

[0023] Each branch sub-channel is connected to the first main channel respectively.

[0024] In one embodiment, a third main channel is formed between the bottom surface of the battery pack and the bottom surface of the box body, and the box body is provided with a fourth through hole, and the fourth through hole is connected to the third main channel;

[0025] The third main channel is connected to the first main channel and each cell branch channel respectively.

[0026] In one embodiment, the battery pack includes a single battery module, and the battery module and the first inner wall of the first accommodating cavity form a first main channel.

[0027] In one of the embodiments, the battery pack further includes a support frame;

[0028] The support frame is arranged in the first accommodating cavity, and the battery pack is arranged on the support frame.

[0029] In a second aspect, the present application provides a battery system, comprising a battery pack as described above.

[0030] One of the above technical solutions has the following advantages and beneficial effects:

[0031] The above-mentioned battery pack includes a battery pack, a box body and a cover body, and the battery pack is provided with a first main channel and a plurality of battery cell branch channels; the first main channel is connected to each battery cell branch channel respectively; the box body is provided with a first accommodating cavity and a first opening, and the first accommodating cavity is used to accommodate the battery pack; the cover body is provided at the first opening, and the first surface of the cover body is provided with a second main channel, the second main channel is adjacent to the first main channel, and the second main channel is connected to the first main channel, so as to achieve the distribution of the flow of cooling liquid in the box body. The present application sets a second main channel in the cover body, and then after the cooling liquid enters the second main channel of the cover body, the cooling liquid can quickly enter the first main channel based on gravity, and then the cooling liquid is quickly distributed to each battery cell branch channel through the first main channel, so as to achieve the cooling and heat dissipation of each single battery cell in the battery pack. Compared with the existing flow channel set in the partition and the wall plate in the box body, the battery pack cooling liquid flow distribution channel of the present application can be designed with a large flow rate, which improves the flow rate of the cooling liquid, improves the temperature consistency of the batteries in the battery pack, and has a good battery heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of a battery pack from a first perspective in an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the exploded structure of the battery pack in the embodiment of the present application;

[0034] Figure 3 This is a schematic diagram of a first partial exploded structure of a battery pack in an embodiment of the present application;

[0035] Figure 4 This is a schematic diagram of the structure of the cover body from a first viewing angle in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of a second partial exploded structure of a battery pack in an embodiment of the present application;

[0037] Figure 6 This is a schematic diagram of the first cross-sectional structure of the battery pack in the embodiment of the present application;

[0038] Figure 7 This is a schematic diagram of a second cross-sectional structure of a battery pack in an embodiment of the present application;

[0039] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point A in the middle.

[0040] Reference numerals:

[0041] 10. Battery pack; 110. Battery module; 112. First end plate; 114. Second end plate; 116. Single cell; 120. First main channel; 130. Cell branch channel; 132. Branch sub-channel; 20. Box; 200. First accommodating cavity; 210. First opening; 220. Fourth through hole; 30. Cover; 300. Second main channel; 310. Beam; 320. First through hole; 330. Second through hole; 400. First side sealing plate; 410. Second side sealing plate; 50. First bracket; 60. Seal; 600. Third through hole; 70. Isolation assembly; 80. Support frame; 800. Third main channel. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0045] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0046] In addition, the term "plurality" shall mean two or more.

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] In one embodiment, Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, a battery pack is provided, including a battery pack 10, a box body 20 and a cover body 30; the battery pack 10 is provided with a first main channel 120 and a plurality of battery cell branch channels 130; the first main channel 120 is respectively connected to each battery cell branch channel 130; the box body 20 is provided with a first accommodating cavity 200 and a first opening 210, and the first accommodating cavity 200 is used to accommodate the battery pack 10; the cover body 30 is provided at the first opening 210, and a second main channel 300 is provided on the first surface of the cover body 30, the second main channel 300 is adjacent to the first main channel 120, and the second main channel 300 is connected to the first main channel 120.

[0049] Among them, the battery pack 10 may be composed of one battery module 110. In another example, the battery pack 10 may also be composed of two or more battery modules 110. The battery module 110 may include a plurality of single cells 116, that is, each single cell 116 may be connected in series and / or in parallel to form the battery module 110. The single cell 116 may be a lithium-ion cell, and the shape of the single cell 116 may be, but is not limited to, a square. Exemplarily, the shape of the single cell 116 is a rectangular parallelepiped, and each single cell 116 in the same battery module 110 is arranged in a single row and multiple columns, and the side with the largest area of ​​one of the two adjacent single cells 116 is arranged opposite to the side with the largest area of ​​the other single cell 116.

[0050] The battery pack 10 is provided with at least one first main channel 120, which is used to connect to the second main channel 300 on the box 20. The battery pack 10 is also provided with a plurality of cell branch channels 130, which are arranged between two adjacent single cells 116 in the same battery module 110. Based on the fact that each cell branch channel 130 is connected to the first main channel 120, when the second main channel 300 of the box 20 inputs cooling liquid, the second main channel 300 transmits the cooling liquid to the first main channel 120, and distributes the cooling liquid through the first main channel 120, so that the cooling liquid is evenly distributed to each cell branch channel 130, and then the cooling liquid can flow into each cell branch channel 130, so as to achieve rapid and uniform cooling and heat dissipation of each single cell 116 in the battery pack 10.

[0051] The number of the cell branch channels 130 can be determined according to the number of the single cells 116. For example, one cell branch channel 130 is provided between two adjacent single cells 116 in the same battery module 110. Exemplarily, the sides with the largest areas of two adjacent single cells 116 in the same battery module 110 are arranged opposite to each other, that is, the cell branch channel 130 is provided between the sides with the largest areas of two adjacent single cells 116. When the cooling liquid flows through the cell branch channel 130, the cooling liquid can cool and dissipate the side with the largest area of ​​the corresponding single cell 116, thereby improving the heat dissipation effect of the side with the largest area of ​​the single cell 116.

[0052] The number of the first main channel 120 can be determined according to the number of battery modules 110 included in the battery pack 10. For example, if the battery pack 10 includes a single or two battery modules 110, the number of the first main channel 120 is 1; for another example, if the battery includes three battery modules 110, the number of the first main channel 120 is 2. Exemplarily, the first main channel 120 can be arranged along the length direction of the battery module 110 in the battery pack 10, so that the cooling liquid in the first main channel 120 can be quickly and evenly distributed to each single battery cell 116 in the battery module 110, so that the cooling liquid can enter each battery cell branch channel 130 almost at the same time, thereby improving the temperature consistency of each single battery cell 116 in the battery pack and improving the heat dissipation effect of the battery pack.

[0053] The box 20 can be used to install and fix the battery pack 10. The box 20 can be a square structure. For example, the box 20 can also be a polygonal or irregular shape. The material of the box 20 can be a metal material or a non-metallic material. For example, the box 20 can be an aluminum profile box 20. The box 20 can be composed of a side panel assembly and a bottom plate. The side panel assembly is arranged on the bottom plate. The side panel assembly and the bottom plate are enclosed to form a first accommodating cavity 200 of the box 20. The battery pack 10 is arranged in the first accommodating cavity 200. The top of the side panel assembly is open, that is, the top of the side assembly forms the first opening 210 of the box 20, and the first opening 210 is connected to the first accommodating cavity 200. For example, corresponding to the square box 20, the side panel assembly is composed of four side panels surrounding and enclosing. For example, according to the orientation, the four side panels can be divided into a front side panel, a rear side panel, a left side panel and a right side panel. The front side panel is arranged opposite to the rear side panel, and the left side panel is arranged opposite to the right side panel.

[0054] The cover 30 is used to cover the first opening 210 of the box 20 to seal the first opening 210 of the box 20. The cover 30 can be arranged at the first opening 210 of the box 20 by means of snap connection, welding or screw connection. The cover 30 can be a plate-shaped structure, and the material of the cover 30 can be a metal material or a non-metal material. For example, the cover 30 can be a cover 30 of an aluminum profile.

[0055] The first surface of the cover body 30 is adjacent to the first accommodating cavity 200, and the second main channel 300 is disposed on the first surface of the cover body 30. The second main channel 300 is used to distribute the input cooling liquid and transmit the distributed cooling liquid to the first main channel 120, thereby quickly and evenly distributing the cooling liquid to the first main channel 120, so that the first main channel 120 is quickly filled with cooling liquid.

[0056] The second main channel 300 is adjacent to the first main channel 120, for example, a corresponding second main channel 300 is arranged directly above the first main channel 120. Exemplarily, the second main channel 300 can be arranged along the length direction of the battery module 110 in the battery pack 10, so that the cooling liquid in the second main channel 300 can be quickly distributed to the first main channel 120, and then the first main channel 120 can quickly and evenly distribute the cooling liquid to each single battery cell 116 in the battery module 110, so that the cooling liquid can enter each battery cell branch channel 130 almost at the same time, thereby improving the temperature consistency of each single battery cell 116 in the battery pack and improving the heat dissipation effect of the battery pack.

[0057] In one example, the length direction of the second main channel 300 is parallel to the length direction of the first main channel 120 , and the second main channel 300 is arranged on the first main channel 120 , so that the cooling liquid in the second main channel 300 is accurately and quickly transmitted to the first main channel 120 .

[0058] The second main channel 300 based on the cover body 30 is connected with the first main channel 120 in the box body 20, and the first main channel 120 is respectively connected to each battery cell branch channel 130, and then the cooling liquid enters the second main channel 300 in the cover body 30. After the cooling liquid is flow-distributed through the second main channel 300, the distributed cooling liquid can quickly enter the first main channel 120 based on gravity and the driving force of the liquid, so that the first main channel 120 is quickly filled with cooling liquid, and then the first main channel 120 redistributes the cooling liquid to each chip branch channel, thereby realizing cooling and heat dissipation of each single battery cell 116 in the battery pack 10.

[0059] The cover body is used to cover the first opening of the box body to seal the internal flow channel of the battery pack. By setting the second main channel 300 on the cover body 30, the internal shunt pipeline of the traditional battery pack is removed, so that the height of the battery pack can be reduced. In addition, by setting the second main channel 300 on the cover body 30, it is also convenient for maintenance and change of plans during product testing. For example, during the test process, multiple samples can be designed. When testing and verifying, only the cover body 30 needs to be changed for quick replacement, avoiding contamination of the cooling liquid when removing and replacing the battery, which is beneficial to saving the cost of testing, assembly and raw materials.

[0060] In one example, the cooling liquid may be a cooling insulating liquid such as ultrapure water, mineral oil, polyolefin, and fluorine-containing fire extinguishing agent.

[0061] It should be noted that the cooling liquid can also be replaced by cooling gas (such as cold air). For example, the cooling gas enters the second main channel 300 in the cover body 30, and after the gas is distributed through the second main channel 300, the distributed gas can quickly enter the first main channel 120 based on the driving force of the liquid, so that the first main channel 120 is quickly filled with gas, and then the first main channel 120 redistributes the gas to each chip branch channel to achieve cooling and heat dissipation of each single cell 116 in the battery pack 10.

[0062] In the above-mentioned embodiment, a first main channel 120 and a plurality of battery cell branch channels 130 are provided through the battery pack 10; the first main channel 120 is respectively connected to each battery cell branch channel 130; the box body 20 is provided with a first accommodating cavity 200 and a first opening 210, and the first accommodating cavity 200 is used to accommodate the battery pack 10; the cover body 30 is provided at the first opening 210, and a second main channel 300 is provided on the first surface of the cover body 30, the second main channel 300 is adjacent to the first main channel 120, and the second main channel 300 is connected to the first main channel 120, so as to realize the distribution of the flow of cooling liquid in the box body 20. The present application sets a second main channel 300 in the cover body 30, and after the cooling liquid enters the second main channel 300 of the cover body 30, the cooling liquid can quickly enter the first main channel 120 based on gravity, and then the cooling liquid is quickly distributed to each battery cell branch channel 130 through the first main channel 120, thereby realizing cooling and heat dissipation of each single battery cell 116 in the battery pack 10. Compared with the existing flow channels set in the partitions and wall panels in the box body 20, the battery pack cooling liquid flow distribution channel of the present application can be designed with a large flow rate, which improves the flow rate of the cooling liquid, improves the temperature consistency of the batteries in the battery pack, and has a good battery heat dissipation effect.

[0063] In one embodiment, Figure 4 , Figure 7 and Figure 8 As shown, at least one beam body 310 is provided on the first surface of the cover body 30, and the beam body 310 and the first surface of the cover body 30 enclose a second main channel 300; the beam body 310 is provided with a plurality of first through holes 320 arranged at intervals, and the second main channel 300 is connected to the first main channel 120 through each first through hole 320.

[0064] The beam 310 can be arranged on the first surface of the cover 30 by welding or bonding. In another example, the beam 310 and the cover 30 are an integrally formed structure. The beam 310 is a hollow structure, and the shape of the beam 310 can be a long strip. The number of beams 310 can be determined according to the number of first main road channels 120. For example, if the battery pack 10 is provided with one first main road channel 120, one beam 310 is correspondingly arranged on the first surface of the cover 30; if the battery pack 10 is provided with two first main road channels 120, two beams 310 are correspondingly arranged on the first surface of the cover 30.

[0065] The beam body 310 and the first surface of the cover body 30 are enclosed to form a corresponding second main channel 300 . The beam body 310 is provided with a plurality of first through holes 320 . The first through holes 320 are arranged at intervals. For example, the first through holes 320 can be evenly spaced along the length direction of the beam body 310 . Each first through hole 320 is respectively connected to the corresponding first main channel 120, and then after the cooling liquid enters the second main channel 300 of the cover body 30, it is output through the first through holes 320 on the beam body 310, so that the flow direction distribution of the cooling liquid in the second main channel 300 is realized. The cooling liquid output by each first through hole 320 can quickly enter the first main channel 120 based on gravity, so that the cooling liquid is dispersedly transmitted to the first main channel 120, and the cooling liquid is quickly distributed to each battery cell branch channel 130 through the first main channel 120, so as to realize rapid cooling and heat dissipation of each single battery cell 116 in the battery pack 10, thereby improving the flow rate of the cooling liquid, improving the battery temperature consistency in the battery pack, and improving the battery heat dissipation effect.

[0066] Since the available space of the cover 30 is larger than the available space of the partitions and wall panels in the box 20, the beam 310 can be fixed in a more flexible manner, which is conducive to the modular design of the beam 310, improves the adaptability of the cover 30, and reduces the manufacturing cost. By setting the beam 310 on the first surface of the cover 30 and setting a plurality of first through holes 320 on the beam 310, compared with the traditional flow channel set in the partition and wall panel in the box 20, it is convenient to design the first main channel 120 of the cover 30 with a large flow, and it is convenient for the first main channel 120 to extend along the entire length of the battery pack, and then based on gravity, the cooling liquid is quickly distributed to the battery cell branch channel 130 between two adjacent single cells 116 of the same battery module 110 in the battery pack 10, so as to achieve cooling and heat dissipation of each single cell 116 in the battery pack 10.

[0067] In one embodiment, Figure 4 and Figure 6 As shown, a second through hole 330 is provided on the second surface of the cover body 30 , and the second through hole 330 is communicated with the second main channel 300 .

[0068] The second surface of the cover body 30 is adjacent to the first surface of the cover body 30, for example, the second surface of the cover body 30 is perpendicular to the first surface of the cover body 30, that is, the first surface of the cover body 30 is the bottom surface of the cover body 30, and the second surface of the cover body 30 is the side surface of the cover body 30. In another example, the second surface of the cover body 30 is opposite to the first surface of the cover body 30, for example, the first surface of the cover body 30 is the bottom surface of the cover body 30, and the second surface of the cover body 30 is the top surface of the cover body 30.

[0069] The second through hole 330 can be used to input cooling liquid. Exemplarily, the second through hole 330 can be used to set a quick-plug interface, and the quick-plug interface can be used to plug in an external liquid supply device, and then the liquid supply device can transmit and inject cooling liquid into the second main channel 300 through the second through hole 330. After the cooling liquid enters the second main channel 300 of the cover body 30, the cooling liquid can quickly enter the first main channel 120 based on gravity, and then the cooling liquid is quickly distributed to each battery cell branch channel 130 through the first main channel 120, so as to achieve rapid and uniform cooling and heat dissipation of each single battery cell 116 in the battery pack 10.

[0070] In one embodiment, Figure 6 and Figure 7 As shown, the second main channel 300 is located above the first main channel 120 , and the length of the second main channel 300 is less than or equal to the length of the first main channel 120 .

[0071] For example, the second main channel 300 can be abutted against the top of the first main channel 120, and the output port of the second main channel 300 (each first through hole 320) is connected to the input port of the first main channel 120. The first main channel 120 is provided with a plurality of output ports, and each output port of the first main channel 120 is connected to each chip branch channel one by one. Then, after the cooling liquid enters the second main channel 300 of the cover body 30, it is dispersedly transmitted to the input port of the first main channel 120 through each first through hole 320, so that different positions of the input port of the first main channel 120 can be injected with cooling liquid, so that the cooling liquid is evenly distributed to the first main channel 120, and then the first main channel 120 can quickly transmit the cooling liquid to each output port of the first main channel 120, so that each output port of the first main channel 120 can be quickly distributed to the corresponding battery cell branch channel 130, so as to achieve rapid cooling and heat dissipation of each single battery cell 116 in the battery pack 10.

[0072] The first main channel 120 may be arranged along the length direction of the battery module 110 in the battery pack 10, and the second main channel 300 may be arranged along the length direction of the battery module 110 in the battery pack 10, and the length of the second main channel 300 may be determined according to the length of the first main channel 120. For example, if the length of the second main channel 300 is equal to the length of the first main channel 120, the second main channel 300 and the first main channel 120 are completely matched and connected, and the cooling liquid in the second main channel 300 can be quickly distributed downward into the first main channel 120 based on gravity, so that each spatial position in the first main channel 120 can flow through the cooling liquid, so that the first main channel 120 can quickly and evenly distribute the cooling liquid to each single battery cell 116 in the battery module 110, so that the cooling liquid can enter each battery cell branch channel 130 almost at the same time. For another example, considering that the available space in the first accommodating cavity 200 is different for boxes 20 of different shapes and sizes, the length of the second main channel 300 can be set to be smaller than the length of the first main channel 120, so that the cooling liquid in the second main channel 300 can still be distributed to the first main channel 120 while meeting the space requirements in the box 20.

[0073] In one embodiment, Figure 3 and Figure 5 As shown, the battery pack 10 includes at least two battery modules 110 , the two adjacent battery modules 110 are spaced apart, and a side sealing plate group is arranged between the two adjacent battery modules 110 ; the two adjacent battery modules 110 and the corresponding side sealing plate group are enclosed to form a first main channel 120 .

[0074] The side sealing plate group is used to seal the two ends of the corresponding two adjacent battery modules 110. For example, the two adjacent battery modules 110 are defined as the first battery module 110 and the second battery module 110, the first end of the first battery module 110 is adjacent to the first end of the second battery module 110, and the second end of the first battery module 110 is adjacent to the second end of the second battery module 110, then a first opening 210 is formed between the first end of the first battery module 110 and the first end of the second battery module 110, and a second opening is formed between the second end of the first battery module 110 and the second end of the second battery module 110, and the first opening 210 and the second opening are sealed by the side sealing plate group, thereby preventing the cooling liquid entering the first main channel 120 from leaking from the first opening 210 and the second opening, and preventing the liquid pressure in the first main channel 120 from decreasing, so that the first main channel 120 can quickly and evenly distribute the cooling liquid to each single cell 116 in the battery module 110, further improving the flow rate of the cooling liquid.

[0075] In one embodiment, Figure 3and Figure 5 As shown, the battery module 110 includes a first end plate 112, a second end plate 114 and a plurality of spaced-apart single cells 116, each single cell 116 is arranged between the first end plate 112 and the second end plate 114, and a cell branch channel 130 is formed between two adjacent single cells 116 in the same battery module 110; the side sealing plate group includes a first side sealing plate 400 and a second side sealing plate 410; a first side sealing plate 400 is arranged between two adjacent first end plates 112, and a second side sealing plate 410 is arranged between two adjacent second end plates 114.

[0076] Among them, the single cell 116 can be a rectangular cell, and the single cells 116 of the same battery module 110 can be arranged in one row and multiple columns. The sides of the single cells 116 with the largest areas in the same battery module 110 are arranged relatively, and each single cell 116 is arranged between the first end plate 112 and the second end plate 114. The first end plate 112 and the second end plate 114 play a role of limiting and fixing each single cell 116. In addition, the first end plate 112 and the second end plate 114 can also be used to absorb the expansion of the single cell 116.

[0077] Two adjacent single cells 116 in the same battery module 110 are spaced apart from each other. For example, an isolating piece may be provided between two adjacent single cells 116 in the same battery module 110, so that a cell branch channel 130 is formed between two adjacent single cells 116 in the same battery module 110. Each cell branch channel 130 is respectively connected to the first main channel 120. After the cooling liquid enters the first main channel 120, the cooling liquid is distributed through the first main channel 120, so that the cooling liquid is quickly distributed to each cell branch channel 130, thereby realizing cooling and heat dissipation of each single cell 116 in the battery pack 10.

[0078] The number of side sealing plate groups can be determined according to the number of battery modules 110 in the battery pack 10. For example, when the battery pack 10 includes two battery modules 110, the number of side sealing plate groups is one; when the battery pack 10 includes three battery modules 110, the number of side sealing plate groups is two, and so on. It should be noted that when the battery pack 10 includes only one battery module 110, the battery module 110 does not need to be provided with a side sealing plate group.

[0079] The side sealing plate group is composed of a first side sealing plate 400 and a second side sealing plate 410. The first side sealing plate 400 is used to seal the first opening 210 formed by the corresponding two adjacent battery modules 110, and the second side sealing plate 410 is used to seal the second opening formed by the corresponding two adjacent battery modules 110. For example, the two adjacent battery modules 110 are defined as the first battery module 110 and the second battery module 110, the first end plate 112 of the first battery module 110 is adjacent to the first end plate 112 of the second battery module 110, the second end plate 114 of the first battery module 110 is adjacent to the second end plate 114 of the second battery module 110, then the first opening 210 is formed between the first end plate 112 of the first battery module 110 and the first end plate 112 of the second battery module 110, and the second end plate 114 of the first battery module 110 and the second end plate 114 of the second battery module 110 are adjacent to each other. A second opening is formed between the second end plates 114 of the two battery modules 110. The first opening 210 is sealed by the first side sealing plate 400, and the second opening is sealed by the second side sealing plate 410, thereby preventing the cooling liquid entering the first main channel 120 from leaking from the first opening 210 and the second opening, and preventing the liquid pressure in the first main channel 120 from decreasing, so that the first main channel 120 can quickly and evenly distribute the cooling liquid to each single cell 116 in the battery module 110, further improving the flow rate of the cooling liquid.

[0080] In one embodiment, Figure 3 As shown, a first bracket 50 is disposed on the battery module 110 ; a beam 310 is disposed between two adjacent first brackets 50 .

[0081] The first bracket 50 can be arranged on the battery module 110 by means of snap connection or screw connection, and two adjacent first brackets 50 are arranged at intervals, so that the first main road channel 120 can be connected with the gap between the two adjacent first brackets 50. When the cover body 30 is arranged on the first opening 210 of the box body 20, the beam body 310 can be arranged between the two adjacent first brackets 50. Exemplarily, when the cover body 30 is arranged on the first opening 210 of the box body 20, the beam body 310 can be arranged abuttingly between the two adjacent first brackets 50, so that the second main road channel 300 can be aligned and connected with the first main road channel 120.

[0082] In one embodiment, Figure 2 and Figure 8 As shown, the battery pack further includes a seal 60 , which is disposed between two adjacent first brackets 50 to seal a gap between the beam body 310 and the corresponding two adjacent first brackets 50 .

[0083] The seal 60 can be used to seal the gap between the beam body 310 and the corresponding two adjacent first brackets 50. For example, the seal 60 is an elastic seal 60. The seal 60 can play a sealing role and prevent the battery module 110 from being deformed and damaged due to pressure.

[0084] By setting the seal 60 between two adjacent first brackets 50, the seal 60 effectively seals the gap between the beam body 310 and the corresponding two adjacent first brackets 50, thereby increasing the working pressure of the cooling liquid flowing from the second main channel 300 to the second main channel 300, and then a higher liquid supply flow rate can be used. The larger the liquid supply flow rate, the faster the temperature regulation response speed for heat dissipation of the single battery cell 116 in the battery pack 10.

[0085] In one embodiment, Figure 2 and Figure 3 As shown, the sealing member 60 is provided with a plurality of third through holes 600 , and each of the third through holes 600 is connected to each of the first through holes 320 in a one-to-one correspondence.

[0086] The sealing member 60 is provided with a third through hole 600 , and the third through hole 600 is matched with the first through hole 320 . For example, the size and shape of the third through hole 600 are the same as the size and shape of the first through hole 320 .

[0087] Exemplarily, when the cover body 30 is set on the first opening 210 of the box body 20, the beam body 310 can be abutted against the seal 60 set between the two adjacent first brackets 50, so that each first through hole 320 on the beam body 310 is connected to each third through hole 600 of the seal 60 in a one-to-one correspondence, and each third through hole 600 of the seal 60 is respectively connected to the first main channel 120, and then after the cooling liquid enters the second main channel 300 of the cover body 30, the cooling liquid is distributed and transmitted to each first through hole 320 on the beam body 310, and passes through the seal 60. After each third through hole 600 is formed, each cooling liquid can quickly enter the first main channel 120 based on gravity and the sealing performance of the seal 60, so as to realize the flow distribution of the cooling liquid from the second main channel 300 to the first main channel 120, so as to disperse the cooling liquid to the first main channel 120, and quickly distribute the cooling liquid to each battery cell branch channel 130 through the first main channel 120, so as to realize rapid cooling and heat dissipation of each single battery cell 116 in the battery pack 10, thereby increasing the flow rate of the cooling liquid and improving the heat dissipation effect of the battery.

[0088] In one embodiment, Figure 5 and Figure 8As shown, an isolation component 70 is provided between two adjacent single battery cells 116 in the same battery module 110 , and the isolation component 70 divides the corresponding battery cell branch channel 130 into a plurality of branch sub-channels 132 ; each branch sub-channel 132 is connected to the first main channel 120 .

[0089] The isolation assembly 70 may be composed of a plurality of isolation members, and the isolation members may be in a strip shape. By arranging the isolation assembly 70 between two adjacent single cells 116 , the isolation assembly 70 can be used to set the interval between the two adjacent single cells 116 , and can also absorb the expansion of the single cells 116 , thereby improving the safety of the battery pack 10 .

[0090] Exemplarily, the isolation component 70 can be horizontally arranged between two adjacent single cells 116, thereby dividing the corresponding cell branch channel 130 into a plurality of horizontally arranged branch sub-channels 132; in another example, the isolation component 70 can also be vertically arranged between two adjacent single cells 116, thereby dividing the corresponding cell branch channel 130 into a plurality of vertically arranged branch sub-channels 132. Based on the fact that each branch sub-channel 132 is respectively connected to the first main channel 120, the first main channel 120 distributes the cooling liquid to each chip branch channel, and the cooling liquid is transmitted through each branch sub-channel 132 in the chip branch channel, so that the cooling liquid is fully in contact with the side with the largest area of ​​the single cell 116, thereby improving the cooling effect of the side with the largest area of ​​the single cell 116.

[0091] In one embodiment, the battery pack 10 includes a single battery module 110 , and the battery module 110 and the first inner wall of the first receiving cavity 200 form a first main channel 120 .

[0092] The first inner wall of the first accommodating cavity 200 refers to the inner wall opposite to the side surface with the largest area in the battery module 110 . The battery module 110 is spaced apart from the first inner wall of the first accommodating cavity 200, so that the battery module 110 and the first inner wall of the first accommodating cavity 200 form a first main channel 120, and the second main channel 300 is arranged on the cover body 30, so that the second main channel 300 is connected with the first main channel 120. For example, when the cover body 30 is arranged on the first opening 210 of the box body 20, the second main channel 300 is located above the first main channel 120, so that the second main channel 300 is aligned and connected with the first main channel 120, and then after the cooling liquid enters the second main channel 300 of the cover body 30, the cooling liquid can quickly enter the first main channel 120 based on gravity, and then the cooling liquid is quickly distributed to each battery cell branch channel 130 through the first main channel 120, so as to realize cooling and heat dissipation of each single battery cell 116 in the battery module 110, thereby improving the flow rate of the cooling liquid, improving the battery temperature consistency in the battery pack, and achieving good battery heat dissipation effect.

[0093] In one embodiment, Figure 2 and Figure 7 As shown, the battery pack further includes a support frame 80 ; the support frame 80 is disposed in the first accommodating cavity 200 , and the battery pack 10 is disposed on the support frame 80 .

[0094] Among them, the support frame 80 can be used to support the battery pack 10, so that the battery pack 10 and the bottom surface of the box body 20 are spaced apart, so that the liquid in the first main channel 120 and each chip branch channel can be collected between the battery pack 10 and the bottom surface of the box body 20, thereby realizing cooling and heat dissipation of the bottom of the battery pack 10.

[0095] Exemplarily, the support frame 80 may be composed of a plurality of support rods connected to reduce the contact area between the support frame 80 and the battery pack 10 , thereby facilitating the cooling liquid to contact the bottom of the battery pack 10 over a larger area, thereby improving the cooling and heat dissipation effect on the bottom of the battery pack 10 .

[0096] In one embodiment, Figure 6 and Figure 7 As shown, a third main channel 800 is formed between the bottom surface of the battery pack 10 and the bottom surface of the box body 20, and the box body 20 is provided with a fourth through hole 220, and the fourth through hole 220 is connected to the third main channel 800; the third main channel 800 is respectively connected to the first main channel 120 and each battery cell branch channel 130.

[0097] Among them, the fourth through hole 220 is used to output cooling liquid. The battery pack 10 is set on the support frame 80, that is, the support frame 80 is set between the bottom surface of the battery pack 10 and the bottom surface of the box body 20, and then the third main channel 800 is formed between the bottom surface of the battery pack 10 and the bottom surface of the box body 20.

[0098] Exemplarily, the fourth through hole 220 can be used to set another quick-plug interface, and the quick-plug interface can be used to plug in an external liquid supply device, so that the cooling liquid in the third main channel 800 can flow back to the liquid supply device through the quick-plug interface on the fourth through hole 220, and the liquid supply device can cool the refluxed cooling liquid, and then the liquid supply device can transmit the injected cooling liquid to the second main channel 300 through the second through hole 330. After the cooling liquid enters the second main channel 300 of the cover body 30, the cooling liquid can quickly enter the first main channel based on gravity. 120, and then the cooling liquid is quickly distributed to each battery cell branch channel 130 through the first main channel 120, and each battery cell branch channel 130 transmits the cooling liquid to the third main channel 800. In addition, the first main channel 120 transmits part of the cooling liquid that has not flowed into the battery cell main channel to the third main channel 800, and the cooling liquid is collected through the third main channel 800 and refluxed to the liquid supply device through the fourth through hole 220, so as to realize the circulation of the cooling liquid, thereby quickly and evenly cooling and dissipating the heat of each single battery cell 116 in the battery pack 10.

[0099] In one embodiment, a battery system is also provided, comprising a battery pack as described above.

[0100] For the specific description of the battery pack, reference may be made to the specific description of the battery pack in the above embodiment, which will not be repeated here.

[0101] For example, a battery pack includes a battery pack, a case and a cover, wherein a first main channel and a plurality of battery cell branch channels are arranged through the battery pack; the first main channel is connected to each battery cell branch channel respectively; the case is provided with a first accommodating cavity and a first opening, and the first accommodating cavity is used to accommodate the battery pack; the cover is arranged at the first opening, and a second main channel is arranged on the first surface of the cover, the second main channel is adjacent to the first main channel, and the second main channel is connected to the first main channel, so as to realize the distribution of the flow of cooling liquid in the case.

[0102] In the above embodiment, a second main channel is set in the cover body, and after the cooling liquid enters the second main channel of the cover body, the cooling liquid can quickly enter the first main channel based on gravity, and then the cooling liquid is quickly distributed to each battery cell branch channel through the first main channel, thereby realizing cooling and heat dissipation of each single battery cell in the battery pack. Compared with the existing flow channels set in the partitions and wall panels in the box body, the battery pack cooling liquid flow distribution channel of the present application can be designed with a large flow rate, which improves the flow rate of the cooling liquid, improves the temperature consistency of the batteries in the battery pack, and has a good battery heat dissipation effect.

[0103] It should be noted that the battery system may also include components such as a BMS, and a specific battery system may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0104] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: include: A battery pack, wherein the battery pack is provided with a first main channel and a plurality of battery cell branch channels, wherein the first main channel is connected to each of the battery cell branch channels respectively; A box body, wherein the box body is provided with a first accommodating cavity and a first opening, wherein the first accommodating cavity is used to accommodate the battery pack; A cover body is provided at the first opening, a first surface of the cover body is provided with a second main channel, the second main channel is adjacent to the first main channel, and the second main channel is communicated with the first main channel.

2. The battery pack according to claim 1, characterized in that: The first surface of the cover body is provided with at least one beam body, and the beam body and the first surface of the cover body are enclosed to form the second main channel; The beam body is provided with a plurality of first through holes arranged at intervals, and the second main channel is connected to the first main channel through the first through holes.

3. The battery pack according to claim 2, characterized in that: The second surface of the cover body is provided with a second through hole, and the second through hole is communicated with the second main channel.

4. The battery pack according to claim 3, characterized in that: The second main channel is located above the first main channel, and the length of the second main channel is less than or equal to the length of the first main channel.

5. The battery pack according to claim 2, characterized in that: The battery pack includes at least two battery modules, two adjacent battery modules are arranged at intervals, and a side sealing plate group is arranged between two adjacent battery modules; Two adjacent battery modules and the corresponding side sealing plate groups are enclosed to form the first main channel.

6. The battery pack according to claim 5, characterized in that: The battery module comprises a first end plate, a second end plate and a plurality of spaced-apart single cells, each of which is arranged between the first end plate and the second end plate, and the cell branch channel is formed between two adjacent single cells in the same battery module; the side sealing plate group comprises a first side sealing plate and a second side sealing plate; The first side sealing plate is disposed between two adjacent first end plates, and the second side sealing plate is disposed between two adjacent second end plates.

7. The battery pack according to claim 5, characterized in that: The battery module is provided with a first bracket; The beam body is arranged between two adjacent first brackets.

8. The battery pack according to claim 7, characterized in that: The battery pack further includes a sealant, which is disposed between the two adjacent first brackets to seal a gap between the beam body and the corresponding two adjacent first brackets.

9. The battery pack according to claim 8, characterized in that: The sealing member is provided with a plurality of third through holes, and each of the third through holes is connected with each of the first through holes in a one-to-one correspondence.

10. The battery pack according to claim 9, characterized in that: The sealing element is an elastic sealing element.

11. The battery pack according to claim 6, characterized in that: An isolation component is provided between two adjacent single cells in the same battery module, and the isolation component divides the corresponding cell branch channel into a plurality of branch sub-channels; Each of the branch sub-channels is connected to the first main channel respectively.

12. The battery pack according to claim 1, characterized in that: A third main channel is formed between the bottom surface of the battery pack and the bottom surface of the box body, and the box body is provided with a fourth through hole, and the fourth through hole is connected to the third main channel; The third main channel is connected to the first main channel and each of the battery cell branch channels respectively.

13. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack includes a single battery module, and the battery module and the first inner wall of the first accommodating cavity form the first main channel.

14. The battery pack according to any one of claims 1 to 12, characterized in that: The battery pack also includes a support frame; The support frame is arranged in the first accommodating cavity, and the battery pack is arranged on the support frame.

15. A battery system, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 14.

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