Battery packs and power-consuming devices

Abstract

The embodiments of the present application relate to the field of battery technology, and in particular to a battery pack and a power consuming device, the battery pack and the power consuming device comprising: a battery cell module, at least one covering material, a first resin layer, and at least one first structural material; the battery cell module comprises a plurality of battery cell assemblies stacked along a first direction, a first surface and a second surface arranged opposite each other along the first direction, a first side surface and a second side surface arranged opposite each other along a third direction, and a first region and a second region located on both sides of the covering material along the second direction; the covering material includes a first segment, a second segment, and a third segment connecting the first segment and the second segment, the first segment covering at least a portion of the first side surface, the second segment covering at least a portion of the second side surface, and the third segment covering the first surface; the first resin layer is provided in the first region; and the first structural material is provided between two adjacent battery cell assemblies to form a passage separating the two adjacent battery cell assemblies. As described above, in the embodiment of the present application, the heat generated in the battery cells can be discharged from the battery pack by utilizing the passage.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on June 30, 2021, bearing application number 202110738687.9 and entitled "Battery Pack and Power Consumption Device," the entire contents of which are incorporated herein by reference.

[0002] TECHNICAL FIELD Embodiments of the present application relate to the field of batteries, and more particularly to battery packs and power consuming devices. [Background technology]

[0003] In the current market, commonly used batteries contain a single battery cell, and because the electrical capacity of a single battery cell is low, in order to increase the electrical capacity, multiple battery cells are usually packaged together to form a new battery pack, which can solve the problem of low battery capacity. Among these, multiple battery cells are usually packaged and fixed by a potting compound.

[0004] In the process of realizing this invention, the inventors of the present application discovered that battery cells generate a lot of heat during use, but if all the battery cells are packaged in potting compound, the heat generated by the battery cells is difficult to dissipate, causing the internal temperature of the entire battery pack to become high, which is extremely dangerous. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the embodiments of the present application provide a battery pack and a power consuming device that solve the problems of poor heat dissipation from the battery and high internal temperature of the entire battery pack. [Means for solving the problem]

[0006] According to one aspect of an embodiment of the present application, there is provided a battery pack, the battery pack including a battery cell module, at least one covering material, a first resin layer, and at least one first structural material, the battery cell module including a plurality of battery cell assemblies stacked along a first direction, the battery cell module including a first surface and a second surface opposed to each other along the first direction, and a first side surface and a second side surface opposed to each other along the third direction, the covering material including a first segment, a second segment, and a third segment connecting the first segment and the second segment, the at least one first structural material is provided between two adjacent battery cell assemblies to form a passageway separating the two adjacent battery cell assemblies, and the passageway includes a gap in the portion located in the second region.

[0007] The covering material can restrict the inflow of potting compound into the passage, and the passage communicates with external air. The passage can discharge heat generated inside the battery pack from the inside of the battery pack, thereby lowering the temperature inside the battery pack. In addition, an external air blowing member or ventilation member can be provided in the passage to accelerate the flow of air inside the passage and increase the heat dissipation of the battery pack, thereby having the effect of lowering the temperature inside the entire battery pack.

[0008] In one aspect, the battery pack includes a battery pack case having an accommodating chamber, a first through hole, and a second through hole, the first through hole and the second through hole being arranged opposite each other along a third direction, the first through hole and the second through hole both communicating with the accommodating chamber, the battery cell module being accommodated in the accommodating chamber, and the first through hole and the second through hole at least partially overlapping with the passage in the third direction.

[0009] In one aspect, the battery pack case comprises a first case and a second case connected together, the first case and the second case forming an accommodation chamber for the battery cell module, the first case having a third through hole communicating with the accommodation chamber, and the third through hole being positioned above the first region along a direction opposite to the first direction.

[0010] In one embodiment, the first segment and the second segment are provided with recesses, and the battery cell module has a side edge portion along the third direction housed in the recesses.

[0011] In one embodiment, the battery cell assembly includes at least one battery cell, each of the battery cells including an electrode assembly, a cell case that houses the electrode assembly, and a tab that is connected to the electrode assembly and extends from the cell case, the cell case including a first portion that houses the electrode assembly and a second portion that extends outward from the first portion, the tab extending from the second portion through the cell case along the second direction, and the portion where the tab extends through the cell case is located in the first region.

[0012] In one embodiment, the battery pack further includes a thermally conductive material coated on an outer surface of each of the battery cell assemblies located in the second region, the thermally conductive material dissipating heat generated in the battery cells located in the second region and then discharging the heat from the battery pack using the passages between the battery cell assemblies, thereby reducing the temperature inside the battery pack.

[0013] In one embodiment, the thermally conductive material is coated on a portion of the surface of each of the battery cell assemblies located in the first region, and the thermally conductive material is coated on a portion of the surface of each of the battery cell assemblies located in the third region. The thermally conductive material conducts heat generated in the battery cells located in the first region and the third region, and then dissipates the heat from the battery pack using paths between the battery cell assemblies, thereby reducing the temperature inside the battery pack.

[0014] In one embodiment, the at least one covering material includes a first covering material and a second covering material arranged in sequence along a direction opposite to the second direction, and the battery module further includes a third region, wherein the first region, the second region, and the third region are arranged in sequence along a direction opposite to the second direction, the first covering material is located between the first region and the second region, and the second covering material is located between the second region and the third region.

[0015] In one embodiment, the battery pack further includes a second resin layer and is formed by applying and fixing a second resin material to the third region, the second resin layer being adhered to the second covering material, and the portion of the passage located between the first covering material and the second covering material including a gap.

[0016] In one embodiment, the coating material includes a fourth segment connecting the first segment and the second segment, the fourth segment being disposed opposite the third segment, and the fourth segment being coated on the second surface.

[0017] In one embodiment, the coating is an annular structure.

[0018] In one embodiment, the coating material partially overlaps the first through hole and the second through hole in the third direction, which is advantageous in reducing the intrusion of foreign matter into the first region and the third region.

[0019] In one embodiment, recesses are provided in the first segment and the second segment, and the side edges of the battery cell module along the third direction are housed in the recesses. The recesses can limit the position of the battery cell module and can store a portion of the adhesive, facilitating adhesive fixation to the battery cell.

[0020] In one aspect, an adhesive boss extends from the groove bottom of the recess in a direction toward the battery cell module. The adhesive boss can slow the flow of adhesive within the recess, which is advantageous for adhesively fixing the battery cell module.

[0021] In one embodiment, the battery pack further includes an adapter assembly including an adapter plate and an adapter element, the adapter plate being provided at a first end of the battery cell, the adapter element being provided on the adapter plate, and the adapter element being connected to the battery cell, and the adapter assembly can be used to connect an external component.

[0022] The first segment has a seventh through hole, and the second segment has an eighth through hole, the seventh through hole and the eighth through hole being opposite each other, and the seventh through hole and the eighth through hole at least partially overlap with the passage in the third direction.

[0023] The battery pack further includes a circuit board, which is provided on one surface of the battery pack case away from the battery cell modules and is electrically connected to the adapter board, and which controls data such as the voltage of the battery cells.

[0024] According to another aspect of an embodiment of the present application, there is provided a power consuming device including a battery pack as described above. [Effects of the Invention]

[0025] Beneficial effects of the embodiments of the present application are as follows: In the embodiments of the present application, a battery cell module, at least one covering material, a first resin layer, and at least one first structural material are provided, whereby the battery cell module comprises a plurality of battery cell assemblies stacked along a first direction, the battery cell module comprises a first surface and a second surface opposed to each other along the first direction and a first side surface and a second side surface opposed to each other along a third direction, the covering material comprises a first segment, a second segment, and a third segment connecting the first segment and the second segment, the first segment covering at least a portion of the first side surface, the second segment covering at least a portion of the second side surface, and the third segment covering the first surface, the battery cell modules are positioned on both sides of the covering material along the second direction. the first direction, the second direction, and the third direction are perpendicular to each other; the first resin layer is formed by applying and fixing a first resin material to the first region; the first resin layer is bonded to the covering material; and at least one first structural material is provided between two adjacent battery cell assemblies to form a passage separating the two adjacent battery cell modules; the passage includes a gap in a portion located in the second region; the passage communicates with outside air; and the passage is used to discharge heat generated in the battery cell assemblies from the battery pack and reduce the temperature inside the battery pack; and an external air blowing member or ventilation member can be provided in the passage to accelerate the flow of air in the passage, thereby increasing heat dissipation from the battery pack and reducing the temperature inside the entire battery pack. [Brief explanation of the drawings]

[0026] In order to more clearly describe the technical aspects of the specific embodiments of the present application or the prior art, the drawings that need to be used in the description of the specific embodiments or the prior art will be briefly described below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn to actual scale. [Figure 1]1 is an assembly schematic diagram of the overall configuration of a battery pack according to an embodiment of the present application. [Figure 2] 1 is an exploded schematic view of the overall configuration of a battery pack according to an embodiment of the present application. [Figure 3] 1 is an exploded schematic view of the overall configuration of a battery pack case of a battery pack according to an embodiment of the present application. [Figure 4] 1 is a side view of a portion of the internal structure of a battery pack according to an embodiment of the present application; [Figure 5] 1 is a schematic assembly diagram of a portion of a configuration of a battery pack according to an embodiment of the present application. [Figure 6] FIG. 2 is an exploded schematic view of a plurality of battery cell modules in a battery pack according to an embodiment of the present application. [Figure 7] 1 is a schematic assembly diagram of a portion of a configuration of a battery pack according to an embodiment of the present application. [Figure 8] FIG. 10 is an assembly schematic diagram of still another part of the configuration of the battery pack according to the embodiment of the present application. [Figure 9] FIG. 2 is an exploded schematic diagram of the configuration of a single battery cell of the battery pack according to the embodiment of the present application. [Figure 10] 1 is a schematic diagram of the overall configuration of a single battery cell of a battery pack according to an embodiment of the present application. [Figure 11] 1 is a side view schematically illustrating a plurality of battery cell modules stacked in stacking order in a battery pack according to an embodiment of the present application. [Figure 12] 10 is a schematic side view of a battery pack according to an embodiment of the present application, in which a plurality of battery cell modules are stacked in another stacking order. FIG. [Figure 13] 10 is a schematic side view of a battery pack according to an embodiment of the present application, in which a plurality of battery cell modules are stacked in another stacking order. FIG. [Figure 14] FIG. 10 is a schematic side view of a battery pack according to an embodiment of the present application, in which a plurality of battery cell modules are stacked in a further stacking order. [Figure 15] 1 is a schematic diagram illustrating an assembly of an adapter assembly and a battery cell module of a battery pack according to an embodiment of the present application. [Figure 16]2 is a schematic diagram of the configuration of an adapter plate of an adapter assembly of a battery pack according to an embodiment of the present application. [Figure 17] 1 is a schematic diagram illustrating the configuration of a covering material of a battery pack according to an embodiment of the present application. [Figure 18] FIG. 10 is a schematic diagram illustrating the configuration of a covering material of another embodiment of the battery pack of the present application. [Figure 19] FIG. 10 is a schematic diagram illustrating an assembly of a covering material and a battery cell module in another embodiment of a battery pack according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] For ease of understanding, the present application will be described in more detail below with reference to the drawings and specific examples. It should be noted that when an element is described as being "fixed" to another element, it may be directly connected to the other element or there may be one or more intermediate elements between them. When an element is described as being "connected" to another element, it may be directly connected to the other element or there may be one or more intermediate elements between them. Terms such as "vertical," "horizontal," "left," "right," and similar terms used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms used herein are for the purpose of describing specific examples only and are not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] To better describe the configuration of the battery pack 01, the configuration of the battery pack 01 will be described in terms of X, Y, and Z coordinate axes, where the X, Y, and Z coordinate axes are perpendicular to each other.

[0030] 1 to 3, a battery pack 01 includes a battery cell module 10, a first resin layer 20, at least one first structure 40, and a covering material 50. The battery cell module 10 includes a plurality of battery cell assemblies 11 stacked and arranged along a first direction Z. The at least one covering material 50 covers the outer surface of the battery cell module 10, and along the second direction Y, the first resin layer 20 is provided at one end of the battery cell module 10, and the first resin layer 20 includes a first resin material. The first structural members 40 are arranged in the battery cell module 10 at intervals to form passages 10a, which communicate with the outside air and allow heat generated inside the battery pack to be discharged from the inside of the battery pack, thereby lowering the temperature inside the battery pack. An external air-blowing member or ventilation member can be provided in the passage 10a to accelerate the flow of air inside the passage 10a and increase the heat dissipation of the battery pack, thereby lowering the temperature inside the entire battery pack.

[0031] The battery pack 01 further includes a second resin layer 30, a battery pack case 70, an adapter assembly 80, a circuit board 90, and a thermally conductive material 100. The battery pack case 70 accommodates the battery cell module 10. The second resin layer 30 includes a second resin material. Along the second direction Y, the second resin layer 30 is provided at the other end of the battery cell module 10, and the adapter assembly 80 is provided at one end of the battery cell module 10 and is electrically connected to the battery cell module 10. Optionally, the adapter assembly 80 and the first resin layer 20 are provided at the same end of the battery cell module 10. Along the first direction Z, the circuit board 90 is provided on a surface of the battery pack case 70 away from the battery cell module 10, the circuit board 90 is electrically connected to the adapter assembly 80, and the thermally conductive material 100 is coated on the battery cell assembly 11, and the thermally conductive material 100 is located between the coating material 50 and the battery cell assembly 11.

[0032] Regarding the battery pack case 70, as shown in Figures 2 and 3, the battery pack case 70 comprises a first case 71 and a second case 72, the first case 71 has a first cavity (not shown), the second case 72 has a second cavity (not shown), the first case 71 is connected to the second case 72, the first cavity and the second cavity form an accommodating chamber 70a of the battery pack case 70, and the accommodating chamber 70a can be used to accommodate the battery cell module 10.

[0033] The battery pack case has a first through hole 701 and a second through hole 702, and the first through hole 701 and the second through hole 702 are arranged opposite each other along the third direction X. The battery pack case 70 has a first side wall 703 and a second side wall 704 that are arranged opposite each other along the third direction X. The first through hole 701 is located on the first side wall 703, and the second through hole 702 is located on the second side wall 704. The first through hole 701, the second through hole 702, and the passage 10a at least partially overlap each other in the third direction X. The first through hole 701 and the second through hole 702 facilitate communication between the passage 10a and outside air and increase the air flow in the passage 10aa, thereby enhancing heat dissipation of the battery pack.

[0034] The positions of the first through hole 701 and the second through hole 702 are not limited to being provided on the first side wall 703 and the second side wall 704, and the first through hole 701 and the second through hole 702 may be provided at different positions, and the positions of the first through hole 701 and the second through hole 702 are set according to the position of the passage 10a. For example, when the passage opening of the passage 10a is directed in the second direction Y, the positions of the first through hole 701 and the second through hole 702 are provided on the other side wall of the battery pack case along the second direction Y, and at least a portion of them overlap with the passage 10a in the second direction Y.

[0035] In some embodiments, the first case 71 has a third through hole 705, which is connected to the accommodating chamber 70a and is located above the first region 12 along a direction opposite to the first direction Z, and the third through hole 705 facilitates injecting the first resin material into the first region 12.

[0036] In some embodiments, the second case 72 has a fourth through hole 706, which is connected to the accommodating chamber 70a and is located above the second region 13 along a direction opposite to the first direction Z, and the fourth through hole 706 facilitates injecting the second resin material into the second region 13.

[0037] As described above, the structure of the battery pack case is not limited to the first case 71 and the second case 72 being connected together, but the battery pack case may also be integrally molded, and the integrally molded battery pack case has a first opening (not shown) that communicates with the accommodating chamber 70a, and the first opening makes it easy to place the battery cell module 10 in the accommodating chamber 70a.

[0038] As shown in Figures 4 to 6, the battery cell module 10 includes a plurality of battery cell assemblies 11 stacked along a first direction Z, and the battery cell module 10 includes a first surface 10b and a second surface 10c facing each other along the first direction Z, and a first side surface 10d and a second side surface 10e facing each other along a third direction X.

[0039] 7 and 8, the battery cell module 10 includes a first region 12, a second region 13, and a third region 14, which are arranged in this order along a direction opposite to the second direction Y. The first region 12 may be used to deposit the first resin material and then form the first resin layer 20, the second region 13 may provide the passage 10a, and the third region 14 may be used to deposit the second resin material and then form the second resin layer 30.

[0040] 9 and 10 , the battery cell assembly 11 includes at least one battery cell, and each battery cell includes an electrode assembly 111, a cell case 112 that houses the electrode assembly 111, and a tab 113 connected to the electrode assembly 111. The cell case 112 includes a first portion 1122 that houses the electrode assembly and a second portion 1121 that extends outward from the first portion 1122. The tab 113 extends from the second portion 1121 through the cell case 112 in the second direction Y, and the portion of the tab 113 that extends from the cell case is located in the first region 12. The second portion 1121 seals the electrode assembly 111 housed in the first portion 1122 and prevents external water vapor from entering the cell case 112. Optionally, the tabs 113 include positive electrode tabs 113a and negative electrode tabs 113b, and the positive electrode tabs 113a and negative electrode tabs 113b are connected between the plurality of battery cells.

[0041] When the electrode assembly 111 is installed in the cell case 112, the second part 1121 of the cell case 112 is adhesively fixed to seal the electrode assembly 111 in the cell case 112, and the adhesively sealed second part 1121 forms a top seal of the battery cell. At the same time, one end of a tab 113 of the battery cell is connected to the electrode assembly 111, and the other end of the tab 113 extends from the second part 1121 along the second direction Y.

[0042] 11 and 12 , the battery cell assembly 11 includes a first battery cell assembly 101, a second battery cell assembly 102, and a third battery cell assembly 103, and the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103 are stacked in order along a first direction Z. Optionally, the number of battery cells in the first battery cell assembly 101 is two, the number of battery cells in the second battery cell assembly 102 is two, and the number of battery cells in the third battery cell assembly 103 is one. Optionally, the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103 have a passage 10a between the three battery cell assemblies 11 that has a width of 3 mm along the first direction Z. In some other embodiments, the width of the passage 10a along the first direction Z is 1.6 mm.

[0043] It should be understood that the stacking configuration between the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103 is not limited to the above arrangement, and for example, as shown in Figures 13 and 14, the third battery cell assembly 103, the first battery cell assembly 101, and the second battery cell assembly 102 may be stacked in this order along the first direction Z, or, for example, the first battery cell assembly 101, the third battery cell assembly 103, and the second battery cell assembly 102 may be stacked in this order along the first direction Z.

[0044] In some embodiments, the first structural material 40 includes foamed cotton, which can be compressed and can provide expansion space for the battery cells, which is advantageous for improving the service life of the battery pack.

[0045] As shown in FIGS. 2 and 15 , the adapter assembly 80 includes an adapter plate 801, an adapter element 802, and a conductive piece 803. The adapter plate 801 is provided at an end of the battery cell close to the tab 113, the adapter element 802 is provided on the adapter plate 801, and the conductive piece 803 is provided on a surface of the adapter plate 801 away from the battery cell. The adapter assembly 80 is used to connect an external component, such as an external component including a protection device that can cut off a circuit when the internal current of the battery exceeds a predetermined value to effectively protect the internal circuit of the battery. In some embodiments, the protection device is a fuse that can cut off a circuit when the internal current of the battery exceeds a predetermined value to effectively protect the internal circuit of the battery. The conductive piece 803 is used to connect the battery cell and electrically connects the adapter plate 801 to the battery cell.

[0046] In some embodiments, the adapter board 801 is a PCB circuit board, which can be a carrier for electronic components and is advantageous for connections between components inside the battery pack.

[0047] 16 , the adapter plate 801 is provided with a second opening 8011, which dissipates heat from the adapter plate 801 during the welding process between the tab 113 and the conductive piece 803, preventing the adapter plate 801 from being damaged due to excessive temperature rise. When the first resin material is injected into the first region 20, the second opening 8011 facilitates the flow of the first resin material, thereby reducing the curing time of the first resin material.

[0048] In some embodiments, the adapter plate 801 is provided with a fifth through hole 8012 and a sixth through hole 8013 located on both sides of the conductive piece 803, which facilitates the tab 113 of the battery cell to pass through the fifth through hole 8012 and the sixth through hole 8013 and connect to the adapter plate 801.

[0049] In some embodiments, as shown in FIG. 15 , the adapter element 802 includes a first adapter element 8021 connected to one tab 113 of the battery cell and a second adapter element 8022 connected to the other tab 113 of the battery cell. Optionally, the adapter element 802 includes a copper bar. Furthermore, the first adapter element 8021 may be a main positive copper bar, and the second adapter element 8022 may be a main negative copper bar. It is understood that the first adapter element 8021 is not limited to a main positive copper bar, and the second adapter element 8022 is not limited to a main negative copper bar. The first adapter element 8021 and the second adapter element 8022 have opposite polarities. The adapter element 802 may include a plurality of first adapter elements 8021 and a plurality of second adapter elements 8022, whereby a plurality of battery cells are connected in series or parallel, and the plurality of first adapter elements 8021 may be connected to the positive electrode tabs 113a or negative electrode tabs 113b of the battery cells, and the plurality of second adapter elements 8022 may be connected to the negative electrode tabs 113b or positive electrode tabs 113a of the battery cells.

[0050] There is no restriction on the polarity of the tabs 113 of the battery cells to which the first adapter element 8021 and the second adapter element 8022 are connected. In addition, the first adapter element 8021 can be connected to a positive electrode tab 113a of a battery cell, and the second adapter element 8022 can be connected to a negative electrode tab 113b of a battery cell. There is no restriction on the polarity of the tabs 113 to which the first adapter element 8021 and the second adapter element 8022 are connected, and it is only necessary that the first adapter element 8021 and the second adapter element 8022 are connected to tabs 113 of opposite polarity.

[0051] As shown in FIG. 2, the circuit board 90 is provided on one surface of the battery pack case 70 that is spaced apart from the battery cell assembly 11, and the circuit board 90 is electrically connected to the adapter plate 801.

[0052] In some embodiments, the circuit board 90 is a Battery Management System (BMS) board, which controls data such as the voltage of the battery cells.

[0053] 7 and 8, the covering material 50 includes a first segment 501, a second segment 502, and a third segment 503 connecting the first segment 501 and the second segment 502. The first segment 501 and the second segment 502 are disposed opposite each other along the third direction X. Along the second direction Y, the length of the first segment 501 is smaller than the length of the battery assembly 11, and the first segment 501 covers at least a portion of the first side surface 10d. Along the second direction Y, the length of the second segment 502 is smaller than the length of the battery assembly 11, and the second segment 502 covers at least a portion of the second side surface 10e. Along the second direction Y, the length of the third segment 503 is smaller than the length of the battery assembly 11, the third segment 503 covers at least a portion of the first surface 10b, and the covering material 50 divides the battery cell module 10 into a first region 12 and a second region 13. The covering material 50 is used to define the position of the battery cell assembly 11 and reduce shaking of the battery cell assembly 11.

[0054] In some embodiments, the coating material 50 partially overlaps the first through-hole 701 and the second through-hole 702 in the third direction X, which is advantageous in reducing the intrusion of external foreign matter into the first region 12 and the third region 14, and the external foreign matter may include dust particles, etc.

[0055] 17 , the covering material 50 includes a fourth segment 505 connecting the first segment 501 and the second segment 502. Along the first direction Z, the fourth segment 505 is disposed opposite the third segment 503. Along the second direction Y, the length of the fourth segment 505 is smaller than the length of the battery cell assembly 11, and the fourth segment 505 covers at least a portion of the second surface 10c, which can further define the position of the battery cell assembly 11. Optionally, the covering material 50 has an annular structure.

[0056] In some embodiments, as shown in FIGS. 7 and 17 , the coating 50 includes a first coating 51 and a second coating 52 sequentially arranged in a direction opposite to the second direction Y. The first coating 51 and the second coating 52 are spaced apart from each other, the first coating 51 being located between the first region 12 and the second region 13, and the second coating 52 being located between the second region 13 and the third region 14. The passage 10a is located in the second region 13, forming a gap. The first coating 51 may restrict the first resin material provided in the first region 12 from flowing into the second region 13, and the second coating 52 may restrict the first resin material provided in the third region 14 from flowing into the second region 13. Optionally, the first coating 51 and the second coating 52 are sealed foam cotton. Optionally, the first coating 51 has an integrally molded structure, and the second coating 52 has an integrally molded structure. Optionally, the first coating 51 comprises a first segment 501, a second segment 502, a third segment 503, and a fourth segment 505. Optionally, the second coating 52 comprises a first segment 501, a second segment 502, a third segment 503, and a fourth segment 505.

[0057] Optionally, an adhesive is provided on the inner surface where the covering material 50 and the battery cell assemblies 11 are connected, which is advantageous for adhesively fixing the covering material 501 to the plurality of battery cell assemblies 11 and further restricting the flow of the first resin material. Optionally, the covering material 50 has elasticity, and the dimensions of the covering material 50 are smaller than the outer dimensions of the plurality of battery cell assemblies 11 so that the covering material 50 can apply pressure to the plurality of battery cell assemblies 11 and further restrict the flow of the first resin material.

[0058] In some embodiments, as shown in FIGS. 18 and 19 , the first covering material 51 and the second covering material 52 are integrally molded to form the covering material 50, and the covering material 50 includes a first segment 501, a second segment 502, a third segment 503, and a fourth segment 505, the third segment 503 is connected to one end of the first segment 501 and the second segment 502, and the fourth segment 505 is connected to the other end of the first segment 501 and the second segment 502, the third segment 503 covers the first surface 10 b, and the fourth segment 505 covers a portion of the second surface 10 c along the third direction X, thereby reducing the shaking of the battery cell assembly 11.

[0059] In some embodiments, a seventh through hole 5011 is provided in the first segment 501, and an eighth through hole 5021 is provided in the second segment 502, the seventh through hole 5011 and the eighth through hole 5021 are arranged opposite each other, the seventh through hole 5011, the eighth through hole 5021, and the passage 10a at least partially overlap in the third direction X, and the seventh through hole 5011 and the eighth through hole 5021 facilitate the flow of outside air between the passage 10a and the passage 10a, which is advantageous for internal heat dissipation of the battery pack.

[0060] In some embodiments, recesses 504 are provided in the first segment 501 and the second segment 502, and the side edges of the battery cell module 10 along the third direction X are accommodated in the recesses 504. The recesses 504 limit the position of the battery cell module 10 and reduce shaking of the battery cell module 10 within the battery pack case, and the recesses 504 can store a portion of the adhesive, facilitating adhesive fixation to the battery cell module 10.

[0061] In some embodiments, a boss 5041 extends from the bottom of the recess 504 in a direction toward the battery cell module 10, and the boss 5041 can slow the flow of adhesive in the recess 504, which is advantageous for adhesively fixing the battery cell module 10.

[0062] 2 , 7 , and 8 , the first resin layer 20 is provided in the first region 12, and the second resin layer 30 is provided in the second region 13. Here, the first resin layer 20 is formed by providing and fixing a first resin material in the first region 12, and the second resin layer 30 is formed by providing and fixing a second resin material in the second region 13, the first resin layer 20 being adhered to the first covering material 51, and the second resin layer 30 being adhered to the second covering material 52. The first resin layer 20 is used to bond the plurality of battery cells and to bond and fix the plurality of battery cells to the first case 71, and the second resin layer 30 is used to bond the plurality of battery cells and to bond and fix the plurality of battery cells to the second case 72. The first resin material and the second resin material include a potting compound, and the potting compound is potted into the first region 12 and the second region 13 from the third through hole 705 and the fourth through hole 706, respectively, and the potting compound potted into the first region 12 hardens to form the first resin layer 20, and the potting compound potted into the second region 13 hardens to form the second resin layer 30.

[0063] The potting method for the first resin layer 20 and the second resin layer 30 may be potting or injection molding, such as low-pressure injection molding. In this embodiment, the potting compound of the first resin layer 20 and the second resin layer 30 may serve to bond, seal, pot, and protect the coating of components. The first resin layer 20 and the second resin layer 30 include an epoxy resin potting compound. The first resin layer 20 and the second resin layer 30 are not limited to being made of an epoxy resin potting compound, and may be replaced with other types of potting compounds in other embodiments.

[0064] As shown in FIGS. 2 and 7 , the thermal conductive material 100 is coated on the outer surface of each battery cell assembly 11 located in the second region 13, and the thermal conductive material 100 is located between the coating material 50 and the battery cell assembly 11. The thermal conductive material 100 conducts heat generated in the battery cells and then dissipates the heat from the battery pack using the passages 10 a between the battery cell assemblies 11, thereby lowering the temperature inside the battery pack.

[0065] In some embodiments, the thermally conductive material 100 is coated on a portion of the surface located in the first region 12 of each of the battery cell assemblies 11 .

[0066] In some embodiments, the thermally conductive material 100 is coated on a portion of the surface of each of the battery cell assemblies 11 located in the third region 14 .

[0067] In some embodiments, the thermally conductive material 100 is an aluminum shell, which has better thermal conductivity and facilitates the dissipation of heat generated from the electric battery cells.

[0068] The present embodiment also provides comparative tests of three battery cell assemblies with different stacking sequences and passages with different widths to better illustrate the heat dissipation effect that can be achieved by the passages 10a formed in the present technical solution.

[0069] Test material: A first battery cell assembly 101, a second battery cell assembly 102, and a third battery cell assembly 103, where the first battery cell assembly 101 includes two battery cells, the second battery cell assembly 102 includes two battery cells, and the third battery cell assembly 103 includes one battery cell.

[0070] Test conditions: The external environmental wind speed was 2 m / s, and the maximum temperature of the battery cell was set to 70°C.

[0071] Conventional solution: The first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103 are stacked in order along the first direction Z, and no passage 10a is provided between the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103. Tests are being conducted to determine the time required for the temperature of the battery cells of the currently installed battery pack to cool from a maximum temperature of 70°C to 55°C, 45°C, and 35°C.

[0072] Method 1: As shown in FIG. 11, a first battery cell assembly 101, a second battery cell assembly 102, and a third battery cell assembly 103 are stacked in order along a first direction Z, and passages 10a are provided between the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103. The width of the passages 10a in the first direction Z is set to 1.6 mm, and the time required for the temperature of the battery cells of the currently installed battery pack to cool from a maximum temperature of 70°C to 55°C, 45°C, and 35°C is tested.

[0073] Method 2: As shown in FIG. 12, the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103 are stacked in order along the first direction Z, and passages 10a are provided between the first battery cell assembly 101, the second battery cell assembly 102, and the third battery cell assembly 103, with the width of the passages 10a in the first direction Z set to 3 mm. Tests are being conducted to determine the time required for the temperature of the battery cells of the currently installed battery pack to cool from a relatively high temperature of 70°C to 55°C, 45°C, and 35°C.

[0074] Method 3: As shown in FIG. 13, the first battery cell assembly 101, the third battery cell assembly 103, and the second battery cell assembly 102 are stacked in order along the first direction Z, and a passage 10a is provided between the first battery cell assembly 101, the third battery cell assembly 103, and the second battery cell assembly 102, and the width of the passage 10a in the first direction Z is set to 3 mm. The time required for the temperature of the battery cells of the currently installed battery pack to cool from a relatively high temperature of 70°C to 55°C, 45°C, and 35°C is tested.

[0075] Method 4: As shown in FIG. 14, the third battery cell assembly 103, the first battery cell assembly 101, and the second battery cell assembly 102 are stacked in order along the first direction Z, and a passage 10a is provided between the third battery cell assembly 103, the first battery cell assembly 101, and the second battery cell assembly 102, and the width of the passage 10a in the first direction Z is set to 3 mm. The time required for the temperature of the battery cells of the currently installed battery pack to cool from a relatively high temperature of 70°C to 55°C, 45°C, and 35°C is tested.

[0076] The analysis results are shown in Table 1 below.

[0077] [Table 1]

[0078] As can be seen from a comparison of the test data between the conventional plan and plan 1 in Table 1, the conventional plan does not have a passage 10a, and the battery cells in the conventional plan take longer to cool from the relatively high temperature of 70°C to 55°C, 45°C, and 35°C. Specifically, plan 1 reduces the time required for the battery cells in the conventional plan to cool from 70°C to 55°C by 1.8 minutes, plan 1 reduces the time required for the battery cells in the conventional plan to cool from 70°C to 45°C by 5 minutes, and plan 1 reduces the time required for the battery cells in the conventional plan to cool from 70°C to 35°C by 11 minutes.

[0079] As can be seen from a comparison of the test data for Method 1 and Method 2 in Table 1, when the stacking arrangement of the three battery cell assemblies is the same, the width of the passage 10a in the first direction Z affects the heat dissipation of the battery cells. When the width of the passage 10a in the first direction Z is large, the passage 10a is more effective in dissipating heat from the battery cells. Specifically, Method 2 reduces the time required for the battery cells of Method 1 to cool from 70°C to 55°C by 2.1 minutes, reduces the time required for the battery cells of Method 1 to cool from 70°C to 45°C by 3.4 minutes, and reduces the time required for the battery cells of Method 2 to cool from 70°C to 35°C by 5.8 minutes compared to the time required for the battery cells of Method 1 to cool from 70°C to 35°C.

[0080] A comparison of the test data for Scheme 2 and Scheme 3 in Table 1 shows that when the width of the passage 10a in the first direction Z is the same, the stacking order of the three battery cell assemblies affects the heat dissipation of the battery cells, and Scheme 3 has a better heat dissipation effect on the battery cells. Specifically, Scheme 3 reduces the time required for the battery cells in Scheme 2 to cool from 70°C to 55°C by 0.7 minutes compared to Scheme 2, reduces the time required for the battery cells in Scheme 2 to cool from 70°C to 45°C by 1.7 minutes, and reduces the time required for Scheme 3 to cool from 70°C to 35°C by 3.1 minutes compared to Scheme 2.

[0081] A comparison of the test data for Scheme 3 and Scheme 4 in Table 1 shows that when the width of the passage 10a in the first direction Z is the same, the stacking order of the three battery cell assemblies affects the heat dissipation of the battery cells, and Scheme 4 has the best heat dissipation effect of the battery cells. Specifically, Scheme 4 reduces the time required for the battery cells in Scheme 3 to cool from 70°C to 55°C by 1.6 minutes, Scheme 4 reduces the time required for the battery cells in Scheme 3 to cool from 70°C to 45°C by 1.6 minutes, and Scheme 3 reduces the time required for the battery cells in Scheme 2 to cool from 70°C to 35°C by 0.4 minutes.

[0082] From the above, it can be seen that the heat dissipation effect of providing a passage 10a between three battery cell assemblies is better than that of the conventional design (where no passage 10a is provided), and that if the width of the passage 10a in the first direction Z is 3 mm, the heat dissipation effect is good. Furthermore, the stacking order of the three battery cell assemblies in the first direction Z affects the heat dissipation of the battery cells, and that if the third battery cell assembly 103, the first battery cell assembly 101, and the second battery cell assembly 102 are stacked along the first direction Z in this order, the heat dissipation effect of the battery cells is good.

[0083] In the embodiment of the present application, a battery cell module 10, a covering material 50, a first resin layer 20, and at least one first structural material 40 are provided, so that the battery cell module 10 includes a plurality of battery cell assemblies 11 stacked along a first direction Z, and the battery cell module 10 includes a first surface 10b and a second surface 10c that are opposite each other along the first direction Z, and a first side surface 10d and a second side surface 10e that are opposite each other along a third direction X. The covering material includes a first segment 501, a second segment 502, and a third segment 503 that connects the first segment 501 and the second segment 502, and the first segment 501 covers at least a portion of the first side surface 10d, the second segment 502 covers at least a portion of the second side surface 10e, and the third segment 503 covers the first surface 10b. The battery cell module 10 includes a first region 12 and a second region 13 located on both sides of the covering material 50 along a second direction Y, and the first direction Z, the second direction Y, and the third direction X are perpendicular to each other two by two, and the first resin layer 20 is formed by applying and fixing a first resin material to the first region 12, and the first resin layer 20 is adhered to the covering material. Furthermore, at least one first structural member 40 is provided between two adjacent battery cell assemblies 11 so as to separate the two adjacent battery cell assemblies 11 and form a passage 10a, the passage 10a including a gap in the portion located in the second region 13, the passage 10a communicating with the outside air, and using the passage 10a to discharge heat generated in the battery cell assemblies 11 from the battery pack and lower the temperature inside the battery pack, and also an external air blowing member or ventilation member can be provided in the passage 10a to accelerate the flow of air within the passage 10a, enhance heat dissipation from the battery pack, and lower the temperature inside the entire battery pack.

[0084] The present application further provides examples of power consumption devices, which include the above-mentioned battery packs, and the power consumption devices include, but are not limited to, agricultural drones, electric motorcycles, power storage devices, handheld power tools, etc. The functions and configurations of the battery packs may refer to the above-mentioned examples and will not be described in detail here.

[0085] The above description is merely an example of the present application and is not intended to limit the scope of the patent of the present application. It goes without saying that even if an equivalent structure or equivalent flow is substituted in the contents of the specification and drawings of the present application, or if the contents are applied directly or indirectly to other related technical fields, it will still be included in the scope of the claims of the present application. [Explanation of symbols]

[0086] 10 Battery cell module 10a aisle 10b 1st surface 10c second surface 10d 1st side 10e second aspect 11 Battery Cell Assembly 11a battery cell 12 1st area 13Second area 14 Third area 111 Electrode Assembly 112 cell case 1121 2nd part 1122 Part 1 101 First battery cell assembly 102 second battery cell assembly 103 Third battery cell assembly 113 tabs 113a positive electrode tab 113b negative electrode tab 20 1st resin layer 30 second resin layer 40 1st structural material 50 cladding 51 1st covering material 52Second covering material 501 1st Segment 5011 7th Through Hole 502 Second Segment 5021 8th Through Hole 503 Third Segment 504 recess 5041 adhesive boss 505 4th Segment 70 Battery Pack Case 70a Containment Chamber 701 First Through Hole 702 Second Through Hole 703 First Side Wall 704 Second Side Wall 705 3rd Through Hole 706 4th Through Hole 71 Case 1 72 Case 2 80 adapter assembly 801 adapter plate 8011 Second Opening 8012 5th through hole 8013 6th Through Hole 802 adapter element 8021 First Adapter Element 8022 second adapter element 803 Conductive Piece 90 circuit board 100 Thermal Conductive Material

Claims

1. A battery pack comprising a battery cell module, the battery cell module including a plurality of battery cell assemblies stacked along a first direction, the battery cell module including a first surface and a second surface opposed to each other along the first direction, and a first side surface and a second side surface opposed to each other along a third direction, The battery pack a coating material comprising a first segment, a second segment, and a third segment connecting the first segment and the second segment, the first segment covering at least a portion of the first side surface, the second segment covering at least a portion of the second side surface, and the third segment covering at least a portion of the first surface; the battery cell module includes a first region and a second region located on either side of the covering material along a second direction, the first resin layer being formed by providing and fixing a first resin material in the first region and being adhered to the covering material; and at least one first structural member provided between two adjacent battery cell assemblies to separate the two adjacent battery cell assemblies and form a passageway; The battery pack according to claim 1, wherein the passage includes a gap in a portion located in the second region.

2. the battery pack includes a battery pack case, the battery pack case being provided with an electrical accommodating chamber, a first through hole, and a second through hole, the first through hole and the second through hole being provided opposite to each other along a third direction, and the first through hole and the second through hole both communicating with the electrical accommodating chamber; The battery pack according to claim 1 , wherein the battery cell module is accommodated in the electrical accommodating chamber, and the first through-hole and the second through-hole at least partially overlap with the passage in the third direction.

3. The battery pack according to claim 2 , wherein the covering material partially overlaps the first through-hole and the second through-hole in the third direction.

4. 3. The battery pack of claim 2, wherein the battery pack case comprises a first case and a second case connected to each other, the first case and the second case forming an electrical accommodating chamber for the battery cell module, the first case having a third through-hole communicating with the electrical accommodating chamber, the third through-hole being located above the first region in a direction opposite to the first direction.

5. 2. The battery pack according to claim 1, wherein the first segment and the second segment have recesses, and the battery cell module has a side edge portion along the third direction housed in the recesses.

6. The battery cell assembly includes at least one battery cell, each of the battery cells including an electrode assembly, a cell case that houses the electrode assembly, and a tab that is connected to the electrode assembly and extends from the cell case; 2. The battery pack of claim 1, wherein the cell case includes a first portion that houses the electrode assembly and a second portion that extends outward from the first portion, a tab extends from the second portion through the cell case along the second direction, and the portion where the tab extends through the cell case is located in the first region.

7. the covering material includes a first covering material and a second covering material provided in this order along a direction opposite to the second direction, 2. The battery pack of claim 1, wherein the battery cell module further includes a third region, the first region, the second region, and the third region are arranged in order along a direction opposite to the second direction, the first covering material is located between the first region and the second region, and the second covering material is located between the second region and the third region.

8. The battery pack of claim 7, further comprising a second resin layer, which is formed by applying and fixing a second resin material to the third region, and the second resin layer is adhered to the second covering material.

9. 8. The battery pack according to claim 7, further comprising a thermally conductive material, the thermally conductive material being coated on an outer surface of each of the battery cell assemblies located in the second region.

10. 10. The battery pack of claim 9, wherein the thermally conductive material is coated on a portion of a surface of each of the battery cell assemblies that is located in the first region, and the thermally conductive material is coated on a portion of a surface of each of the battery cell assemblies that is located in the third region.

11. 2. The battery pack according to claim 1, wherein the covering material includes a fourth segment connecting the first segment and the second segment, the fourth segment being disposed opposite the third segment, and the fourth segment being covered on the second surface.

12. The battery pack according to claim 11, wherein the covering material has an annular structure.

13. 2. The battery pack according to claim 1, further comprising an adapter assembly, the adapter assembly including an adapter plate and an adapter element, the adapter plate being provided on a first side of the battery cell module, the adapter element being provided on the adapter plate, and the adapter element being connected to the battery cell module.

14. 2. The battery pack of claim 1, wherein the first segment has a seventh through hole, the second segment has an eighth through hole, the seventh through hole and the eighth through hole are arranged opposite each other, and the seventh through hole and the eighth through hole at least partially overlap with the passage in the third direction.

15. A power consumption device comprising the battery pack according to any one of claims 1 to 14.

Images