Battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery device and electric equipment. The battery device comprises a box body; the plurality of single batteries are arranged along a first direction, the plurality of single batteries are accommodated in the box body, and the first wall of each single battery in the plurality of single batteries is fixed with the first box body wall of the box body; and the breathable glue blocking structure is positioned between the first walls of two adjacent battery monomers in the plurality of battery monomers and the first box body wall, and the breathable glue blocking structure is used for covering a first gap between the first walls of the two adjacent battery monomers. According to the battery device and the electric equipment provided by the embodiment of the invention, the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical appliance. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In current battery manufacturing processes, individual battery cells are fixed to the casing using adhesives, which often results in adhesive overflow. Adhesive overflow affects the safety performance of the battery device during use and also reduces its energy density. Therefore, reducing adhesive overflow during battery assembly has become an urgent problem to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical appliance that can improve the reliability of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a housing; a plurality of battery cells arranged along a first direction, the plurality of battery cells being housed within the housing, wherein a first wall of each of the plurality of battery cells is fixed to a first housing wall of the housing; and a breathable adhesive barrier structure located between the first walls of two adjacent battery cells and the first housing wall, the breathable adhesive barrier structure being used to cover a first gap between the first walls of the two adjacent battery cells.

[0006] Therefore, in the battery device of this application embodiment, when the first wall of two adjacent battery cells is fixed to the first housing wall by an adhesive, the breathable and adhesive-blocking structure covering the first gap can prevent the adhesive from penetrating between the two adjacent battery cells through the first gap, thereby reducing the risk of the adhesive solidifying and accumulating between the two adjacent battery cells. This reduces local stress concentration in the battery device during use and transportation, reduces lithium plating in the battery device, and improves the reliability of the battery device.

[0007] In addition, when adhesive is injected between the first wall of the battery cell and the first housing wall, air bubbles may be present in the adhesive. Since the breathable sealing structure of this embodiment is also breathable, the air bubbles in the adhesive can be discharged from the breathable sealing structure by appropriate squeezing, thereby reducing the probability of a large-area cavity being generated between the first wall of the battery cell and the first housing wall, increasing the sealing area between the first wall of the battery cell and the first housing wall, and reducing the amount of adhesive used.

[0008] In some embodiments, the first housing wall is perpendicular to the direction of gravity, and along this direction, the first housing wall is located below the plurality of battery cells. When an adhesive is injected between the first wall of the battery cell and the first housing wall, the adhesive can be squeezed under the weight of the battery cell itself. This improves the connection strength between the first wall of the battery cell and the first housing wall, and also helps to squeeze out air bubbles in the adhesive, facilitating the removal of air bubbles.

[0009] In some embodiments, along the extension direction of the first gap, the length of the breathable adhesive barrier structure is greater than or equal to the length of the first gap, so that the breathable adhesive barrier structure can prevent adhesive from entering between two adjacent battery cells through any area of ​​the first gap.

[0010] In some embodiments, the battery device includes: a plurality of battery cell groups arranged along a second direction, each of the plurality of battery cell groups including the plurality of battery cells, to facilitate the processing and assembly of the battery device.

[0011] In some embodiments, the breathable adhesive barrier structure is also located between the first wall of two adjacent battery cell groups and the first housing wall in the plurality of battery cell groups. The breathable adhesive barrier structure is also used to cover the second gap between the first walls of the two adjacent battery cell groups. By providing a breathable adhesive barrier structure that covers both the first gap and the second gap, it is possible to prevent the adhesive from penetrating through the first gap or the second gap into the space between any two adjacent battery cells. This reduces the risk of the adhesive solidifying and accumulating between the two adjacent battery cells, thereby minimizing local stress concentration within the battery device during use and transportation, reducing lithium plating in the battery device, and improving the reliability of the battery device.

[0012] In some embodiments, the length of the breathable adhesive barrier structure along the extension direction of the second gap is greater than or equal to the length of the second gap, so that the breathable adhesive barrier structure can prevent adhesive from entering between two adjacent battery cell groups through any area of ​​the second gap.

[0013] In some embodiments, multiple adjacent battery cells arranged along the second direction and located in different battery cell groups correspond to the same breathable baffle structure, thereby reducing the number of breathable baffle structures in the battery device, simplifying the structure, and improving the processing efficiency of the battery device.

[0014] In some embodiments, the air permeability of the breathable barrier structure is within the range of [5000 ml / min / cm]. 2 6000ml / min / cm 2 The air permeability of a breathable, adhesive-backed structure is typically greater than or equal to 5000 ml / min / cm². 2This allows air bubbles in the adhesive to be quickly expelled through the breathable barrier structure. Conversely, the air permeability of a breathable barrier structure is typically less than or equal to 6000 ml / min / cm². 2 This reduces the difficulty of selecting materials for the breathable adhesive barrier structure and saves costs.

[0015] In some embodiments, the material of the breathable adhesive barrier structure includes polypropylene and / or polyethylene for ease of implementation.

[0016] In some embodiments, each battery cell further includes a second wall intersecting the first wall. The second walls of two adjacent battery cells are disposed opposite each other, and the first wall and the second wall are connected by a rounded corner. The breathable adhesive barrier structure at least covers the area where the rounded corner of the first wall is located. Providing a breathable adhesive barrier structure that at least covers the area where the rounded corner is located reduces the amount of adhesive entering the gap between the rounded corners of the two battery cells, reduces localized stress concentration caused by adhesive accumulation in these gaps, and reduces lithium plating in the battery device, thereby improving the reliability of the battery device. Furthermore, adhesive air bubbles can also be discharged through the breathable adhesive barrier structure and through the gap between the rounded corners of the two battery cells, reducing the probability of large-area cavities forming between the first wall of the battery cell and the first casing wall, increasing the bonding area between the first wall of the battery cell and the first casing wall, and reducing the amount of adhesive used.

[0017] In some embodiments, the battery device further includes a buffer disposed between two adjacent battery cells, the first gap including the side of the gap facing the first housing wall, to prevent adhesive from entering the gap.

[0018] In a second aspect, an electrical device is provided, comprising: a battery device as described in the first aspect or any embodiment of the first aspect, the battery device being used to supply power to the electrical device.

[0019] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application;

[0021] Figure 2 This is an exploded view of a battery device according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of multiple battery cells according to one embodiment of this application;

[0024] Figure 5 This is a schematic diagram of multiple battery cells and a breathable adhesive barrier structure according to an embodiment of this application;

[0025] Figure 6 This is another schematic diagram of multiple battery cells according to one embodiment of this application;

[0026] Figure 7 This is another schematic diagram of a plurality of battery cells and a breathable adhesive barrier structure according to an embodiment of this application;

[0027] Figure 8 This is yet another schematic diagram of multiple battery cells and a breathable adhesive barrier structure according to an embodiment of this application;

[0028] Figure 9 This is a schematic diagram of the structure of any two adjacent battery cells according to an embodiment of this application;

[0029] Figure 10 This is a magnified schematic diagram of the partial structure of any two adjacent battery cells according to an embodiment of this application;

[0030] Figure 11 This is an enlarged schematic diagram of another partial structure of any two adjacent battery cells according to an embodiment of this application.

[0031] The accompanying drawings are not drawn to scale.

[0032] Figure label:

[0033] 1-Vehicle; 10-Battery unit; 11-Box; 111-First box section; 112-Second box section; 113-First box wall; 12-Ventilable and adhesive-proof structure; 121-Protruding structure; 13-Buffer; 131-Gap; 14-Adhesive; 141-Bubble; 20-Battery cell; 200-Battery cell group; 201-First battery cell; 202-Second battery cell; 203-Third battery cell; 204-Fourth battery cell; 205-Fifth battery cell; 206-Sixth battery cell; 207-Seventh battery cell; 208-Eighth battery cell; 21-First wall; 211-Rounded corner; 22-Second wall; 23-First gap; 24-Second gap; 25-Electrode terminal; 251-Positive electrode terminal; 252-Negative electrode terminal; 26-Outer shell; 30-Controller; 40-Motor. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0037] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0041] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0042] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0043] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0044] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0045] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0046] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0047] The battery device mentioned in the embodiments of this application can be a battery pack, which includes a housing and multiple battery cells housed within the housing. The multiple battery cells are connected in series, parallel, or a combination of these connections via a busbar.

[0048] As an example, the housing may include a first housing section and a second housing section. The first housing section and the second housing section are fastened together to form a closed space inside the housing for storing individual battery cells. Here, "closed" refers to covering or shutting off; it can be sealed or not sealed.

[0049] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0050] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0051] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0052] In battery packs, individual battery cells are typically fixed to the casing using adhesives, which often results in adhesive overflow. This overflow affects the safety performance of the battery pack during use and also reduces its energy density. Therefore, reducing adhesive overflow during battery pack assembly has become a pressing issue.

[0053] Therefore, embodiments of this application provide a battery device and an electrical appliance that can solve the above-mentioned problems. The battery device of this application includes a housing, multiple battery cells, and a breathable, adhesive-proof structure. The housing is used to accommodate multiple battery cells arranged along a first direction, with the first walls of the multiple battery cells fixed to the first wall of the housing. The breathable, adhesive-proof structure is located between the first walls of two adjacent battery cells and the first housing wall, and covers the first gap between the first walls of the two adjacent battery cells. Thus, when the first walls of the two adjacent battery cells are fixed to the first housing wall with an adhesive, the breathable, adhesive-proof structure can prevent the adhesive from penetrating through the first gap into the space between the two adjacent battery cells, reducing the risk of the adhesive solidifying and accumulating between the two adjacent battery cells. This reduces local stress concentration within the battery device during use and transportation, lowers the risk of lithium plating, and improves the reliability of the battery device.

[0054] In addition, when adhesive is injected between the first wall of the battery cell and the first housing wall, air bubbles may be present in the adhesive. Since the breathable sealing structure of this embodiment is also breathable, the air bubbles in the adhesive can be discharged from the breathable sealing structure by appropriate squeezing, thereby reducing the probability of a large-area cavity being generated between the first wall of the battery cell and the first housing wall, increasing the sealing area between the first wall of the battery cell and the first housing wall, and reducing the amount of adhesive used.

[0055] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0056] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0057] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0058] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0059] For example. Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown. Figure 2As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The cylindrical shape shown, or it could be different. Figure 2 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0060] It should be understood that, such as Figure 2 As shown, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 2 As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0061] For example, unlike Figure 2 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0062] Figure 3 A schematic diagram of the structure of a battery cell 20 according to an embodiment of this application is shown. For example, the battery cell 20 is shown. Figure 3 The battery cell 20 shown can be as follows: Figure 2 The battery device 10 shown includes any one of the battery cells 20. For example... Figure 3As shown, the battery cell 20 in this embodiment includes a housing 26, which can be a polyhedral structure. For example, this embodiment mainly uses a cuboid battery cell 20 as an example, that is, the housing 26 is a cuboid, but this embodiment is not limited to this.

[0063] In this battery cell 20, the outer casing 26 is a hollow structure, which can be used to house electrode components, which are the components in the battery cell 20 where electrochemical reactions occur. Furthermore, depending on actual usage requirements, one or more electrode components can be configured within the outer casing 26.

[0064] It should be understood that the battery cell 20 in this embodiment may also include other components. For example, the housing 26 may also be provided with electrode terminals 25, which are used to electrically connect with the electrode assembly inside the battery cell 20 to output the electrical energy of the battery cell 20. Figure 3 As shown, the battery cell 20 may include at least two electrode terminals 25, which may be disposed on the same wall or different walls of the battery cell 20, for example, Figure 3 Taking a battery cell 20 as an example, which includes two electrode terminals 25, and these two electrode terminals 25 are disposed on the same wall. The battery cell 20 includes at least two electrode terminals 25, which may include at least one positive electrode terminal 251 and a negative electrode terminal 252. The positive electrode terminal 251 may be directly or indirectly electrically connected to the positive electrode tab of the electrode assembly. For example, the positive electrode tab may be connected to the positive electrode terminal 251 through a connecting member. The negative electrode terminal 252 may be directly or indirectly electrically connected to the negative electrode tab of the electrode assembly. For example, the negative electrode tab may be electrically connected to the negative electrode terminal 252 through another connecting member.

[0065] For ease of description, this application embodiment defines three reference directions based on a cuboid battery cell 20. The length direction of the battery cell 20 is direction X, the width direction of the battery cell 20 is direction Y, and the height direction of the battery cell 20 is direction Z. The length direction X, the width direction Y, and the height direction Z of the battery cell 20 are perpendicular to each other, and the dimension of the width direction Y of the battery cell 20 is smaller than the dimension of the length direction X. For example, the width direction Y of the battery cell 20 is its thickness direction.

[0066] Figure 4 A schematic diagram of a plurality of battery cells 20 within a battery device 10 according to an embodiment of this application is shown. Figure 5 A schematic diagram of a plurality of battery cells 20 and a breathable adhesive barrier structure 12 within a battery device 10 according to an embodiment of this application is shown. In this embodiment, as... Figures 2 to 5As shown, the battery device 10 may include a housing 11, a plurality of battery cells 20, and a breathable and adhesive-resistant structure 12. Specifically, the plurality of battery cells 20 arranged along a first direction are housed within the housing 11, and the first wall 21 of each of the plurality of battery cells 20 is fixed to the first housing wall 113 of the housing 11; the breathable and adhesive-resistant structure 12 is located between the first wall 21 of two adjacent battery cells 20 and the first housing wall 113, and the breathable and adhesive-resistant structure 12 is used to cover the first gap 23 between the first walls 21 of the two adjacent battery cells 20.

[0067] It should be understood that the battery device 10 in this application embodiment can be used to accommodate multiple battery cells 20. This application embodiment is mainly described using multiple battery cells 20 arranged along a first direction as an example. For example, as... Figures 2 to 5 As shown, taking the length direction X of the battery cell 20 as an example, the battery device 10 may include a plurality of battery cells 20 arranged along the length direction X of the battery cell 20.

[0068] It should be understood that the first box wall 113 in this application embodiment can be any wall of the box 11, that is, the first box wall 113 can be any wall of the first box part 111 or the second box part 112. For example, this application embodiment mainly takes the first box wall 113 as the bottom wall of the second box part 112, but the application embodiment is not limited to this.

[0069] In this embodiment of the application, the outer casing 26 of each battery cell 20 may include multiple walls, wherein the first wall 21 of the battery cell 20 faces the first casing wall 113 of the casing 11, and the battery cell 20 is fixed to the first casing wall 113 through the first wall 21. For example, the first wall 21 and the first casing wall 113 may be fixed by an adhesive 14.

[0070] It should be understood that the breathable adhesive barrier structure 12 of this application embodiment is located between the first wall 21 of two adjacent battery cells 20 arranged along the first direction and the first housing wall 113, and covers the first gap 23 between the first walls 21 of the two battery cells 20. For example, as Figure 4 and Figure 5As shown, taking the length direction X of the battery cell 20 as an example, for any two adjacent battery cells 20 arranged along the first direction, taking the first battery cell 201 and the second battery cell 202 as examples, the first battery cell 201 and the second battery cell 202 are arranged adjacent to each other, and there is a first gap 23 between the first wall 21 of the first battery cell 201 and the first wall 21 of the second battery cell 202. Then, the breathable and adhesive-proof structure 12 is disposed between the first wall 21 of the first battery cell 201 and the first wall 21 of the second battery cell 202 and the first housing wall 113, and the breathable and adhesive-proof structure 12 at least covers the first gap 23 between the first battery cell 201 and the second battery cell 202.

[0071] Figure 6 Another schematic diagram of a plurality of battery cells 20 within the battery device 10 of an embodiment of this application is shown. Figure 7 Another schematic diagram shows a plurality of battery cells 20 and a breathable adhesive barrier structure 12 within the battery device 10 according to an embodiment of this application. Figure 4 and Figure 5 different, Figure 6 and Figure 7 Taking the width direction Y of the battery cell 20 as an example, for any two adjacent battery cells 20 arranged along the first direction, such as the third battery cell 203 and the fourth battery cell 204, the third battery cell 203 and the fourth battery cell 204 are arranged adjacently, and there is a first gap 23 between the first wall 21 of the third battery cell 203 and the first wall 21 of the fourth battery cell 204. Then, the breathable and adhesive-proof structure 12 is disposed between the first wall 21 of the third battery cell 203 and the first wall 21 of the fourth battery cell 204 and the first housing wall 113, and the breathable and adhesive-proof structure 12 at least covers the first gap 23 between the third battery cell 203 and the fourth battery cell 204.

[0072] Thus, when the first walls 21 of two adjacent battery cells 20 are fixed to the first housing wall 113 using adhesive 14, for example, when the first walls 21 of the first battery cell 201 and the first walls 21 of the second battery cell 202 are fixed to the first housing wall 113 using adhesive 14, or when the first walls 21 of the third battery cell 203 and the first walls 21 of the fourth battery cell 204 are fixed to the first housing wall 113 using adhesive 14, the breathable and adhesive-resistant structure 12 can prevent the adhesive 14 from passing through the first gap 2. 3. It penetrates into the space between two adjacent battery cells 20. For example, it can prevent the adhesive 14 from penetrating through the first gap 23 into the space between the first battery cell 201 and the second battery cell 202 or between the third battery cell 203 and the fourth battery cell 204, thereby reducing the risk of the adhesive 14 solidifying and accumulating between the two adjacent battery cells 20. This reduces local stress concentration in the battery device 10 during use and transportation, reduces lithium plating in the battery device 10, and improves the reliability of the battery device 10.

[0073] In addition, when adhesive 14 is injected between the first wall 21 of the battery cell 20 and the first housing wall 113, air bubbles 141 may be present in the adhesive 14. Since the breathable sealing structure 12 of this embodiment is also breathable, the air bubbles 141 in the adhesive 14 can be discharged from the breathable sealing structure 12 by appropriate squeezing, thereby reducing the probability of a large area cavity being generated between the first wall 21 of the battery cell 20 and the first housing wall 113, increasing the sealing area between the first wall 21 of the battery cell 20 and the first housing wall 113, and reducing the amount of adhesive 14 used.

[0074] In this embodiment, the first housing wall 113 can be any wall of the housing 11. For example, the first housing wall 113 is perpendicular to the direction of gravity, and along the direction of gravity, the first housing wall 113 is located below the plurality of battery cells 20. Figures 2 to 7 As shown, taking the height direction Z of the battery cell 20 as the direction of gravity as an example, the first housing wall 113 in this embodiment can be the bottom wall of the housing 11 perpendicular to the height direction Z. Thus, when adhesive 14 is injected between the first wall 21 of the battery cell 20 and the first housing wall 113, the adhesive 14 can be squeezed under the weight of the battery cell 20 itself. This improves the connection strength between the first wall 21 of the battery cell 20 and the first housing wall 113, and also helps to squeeze out air bubbles 141 in the adhesive 14, facilitating the removal of air bubbles 141.

[0075] In this embodiment of the application, the battery device 10 includes a plurality of battery cell groups 200 arranged along a second direction, each of the plurality of battery cell groups 200 including a plurality of battery cells 20, to facilitate the processing and assembly of the battery device 10. For example, as Figure 4 and Figure 5 As shown, taking the length direction X of the battery cell 20 as an example, the second direction can be the width direction Y of the battery cell 20, that is... Figure 4 and Figure 5 Each row of battery cells 20 corresponds to one battery cell group 200, and the battery device 10 may include multiple battery cell groups 200. For example, such as... Figure 6 and Figure 7 As shown, taking the width direction Y of the battery cell 20 as an example, the second direction can be the length direction X of the battery cell 20, that is... Figure 6 and Figure 7 Each column of battery cells 20 corresponds to a battery cell group 200, and the battery device 10 may include multiple battery cell groups 200.

[0076] In some embodiments, such as Figure 6 and Figure 7 As shown, the battery cell assembly 200 can be a battery cell assembly or a battery module. The battery cell assembly 200 is formed by arranging and fixing multiple battery cells 20 to form an independent module. As an example, the battery cell assembly 200 can be formed by binding multiple battery cells 20 together with cable ties.

[0077] like Figures 4 to 7 As shown, the breathable adhesive barrier structure 12 of this application embodiment can be located between multiple battery cells 20 included in the same battery cell group 200; further, the breathable adhesive barrier structure can also be located between different battery cell groups 200.

[0078] Figure 8 This illustration shows another schematic diagram of a plurality of battery cells 20 and a breathable, insulating structure 12 within a battery device 10 according to an embodiment of this application. Figure 6 and Figure 7 similar, Figure 8 Taking the first direction as the width direction Y of the battery cell 20 and the second direction as the length direction X of the battery cell 20 as an example, the battery device 10 includes a plurality of battery cell groups 200 arranged along the length direction X of the battery cell 20, and each battery cell group 200 includes a plurality of battery cells 20 arranged along the width direction Y of the battery cell 20.

[0079] In some embodiments, the breathable adhesive barrier structure 12 is also located between the first wall 21 of two adjacent battery cell groups 200 and the first housing wall 113, and the breathable adhesive barrier structure 12 is also used to cover the second gap 24 between the first walls 21 of two adjacent battery cell groups 200. Figure 6 and Figure 8 As shown, for multiple battery cell groups 200 arranged along the length direction X of the battery cell 20, there is a second gap 24 between any two adjacent battery cell groups 200. The breathable adhesive barrier structure 12 covers both the first gap and the second gap 24, which can prevent the adhesive 14 from penetrating into the battery device 10 between any two adjacent battery cells 20 through the first gap or the second gap 24. This reduces the risk of the adhesive 14 solidifying and accumulating between the two adjacent battery cells 20, so as to minimize local stress concentration in the battery device 10 during use and transportation, reduce lithium plating in the battery device 10, and improve the reliability of the battery device 10.

[0080] In some embodiments, the second gap 24 between two adjacent battery cell groups 200 can be covered by the same breathable baffle structure 12, that is, the breathable baffle structure 12 can extend along the second direction and cover the second gap 24 between the first walls 21 of the two battery cell groups 200 by the same breathable baffle structure 12.

[0081] In some embodiments, multiple adjacent battery cells 20 arranged along the second direction and located within different battery cell groups 200 correspond to the same breathable adhesive barrier structure 12. For example, such as Figure 8As shown, taking the two battery cell groups 200 corresponding to the two columns of battery cells 20 on the left as an example, the multiple adjacent battery cells 20 arranged along the second direction in this embodiment of the application include the third battery cell 203 in the first battery cell group 200 and the fifth battery cell 205 in the second battery cell group 200. Therefore, the third battery cell 203 in the first battery cell group 200 and the fifth battery cell 205 in the second battery cell group 200 can correspond to the same breathable adhesive structure 12. Specifically, a breathable adhesive barrier structure 12 is provided between the third battery cell 203 and the fourth battery cell 204 in the first battery cell group 200. Correspondingly, a breathable adhesive barrier structure 12 is also provided between the fifth battery cell 205 and the sixth battery cell 206 in the second battery cell group 200. The breathable adhesive barrier structure 12 between the third battery cell 203 and the fourth battery cell 204 can be the same as the breathable adhesive barrier structure 12 between the fifth battery cell 205 and the sixth battery cell 206, so as to reduce the number of breathable adhesive barrier structures 12 in the battery device 10, simplify the structure, and improve the processing efficiency of the battery device 10.

[0082] It should be understood that the dimensions of the breathable adhesive barrier structure in this application embodiment can be set according to actual application. In some embodiments, along the extending direction of the first gap 23, the length of the breathable adhesive barrier structure 12 is greater than or equal to the length of the first gap 23, so that the breathable adhesive barrier structure 12 can prevent the adhesive 14 from entering between two adjacent battery cells 20 through any area of ​​the first gap 23. For example, as Figure 4 and Figure 5 As shown, taking the width direction Y of the battery cell 20 as an example, the extension direction of the first gap 23 is the width direction Y of the battery cell 20. For any two battery cells 20, such as the first battery cell 201 and the second battery cell 202, the length L21 of the breathable baffle structure 12 is greater than or equal to the length L11 of the first gap 23 between the first battery cell 201 and the second battery cell 202. Furthermore, when the same breathable baffle structure 12 is provided between multiple battery cell groups 200, the total length L2 of the breathable baffle structure 12 is greater than or equal to the total length L1 of the first gaps 23 between the multiple battery cell groups 200.

[0083] For example, such as Figure 6 and Figure 7As shown, taking the length direction X of the battery cell 20 as an example, the extension direction of the first gap 23 is the length direction X of the battery cell 20. For any two battery cells 20, such as the third battery cell 203 and the fourth battery cell 204, the length L41 of the breathable adhesive barrier structure 12 is greater than or equal to the length L31 of the first gap 23 between the third battery cell 203 and the fourth battery cell 204. Furthermore, when the same breathable adhesive barrier structure 12 is provided between multiple battery cell groups 200, the total length L4 of the breathable adhesive barrier structure 12 is greater than or equal to the total length L3 of the first gaps 23 between the multiple battery cell groups 200.

[0084] In some embodiments, along the extending direction of the second gap 24, the length of the breathable adhesive barrier structure 12 is greater than or equal to the length of the second gap 24, so that the breathable adhesive barrier structure 12 can prevent the adhesive 14 from entering between two adjacent battery cell packs 200 through any area of ​​the second gap 24. For example, as Figure 6 and Figure 8 As shown, taking the width direction Y of the battery cell 20 as an example, the extension direction of the second gap 24 is the width direction Y of the battery cell 20, and the length L6 of the breathable adhesive structure 12 is greater than or equal to the length L5 of the second gap 24.

[0085] In some embodiments, the width of the breathable adhesive barrier structure 12 can be set according to the actual application. For example, the width of the breathable adhesive barrier structure 12 can be set according to the shape of the first wall 21. As another example, the width of the breathable adhesive barrier structure 12 can be set according to the size of the first gap 23 and / or the size of the second gap 24.

[0086] Figure 9 This invention illustrates a schematic diagram of the structure of any two adjacent battery cells 20 according to an embodiment of this application. Figure 10 This application shows a partial enlarged structural schematic diagram of any two adjacent battery cells 20 according to an embodiment of the present application. For example, Figure 10 for Figure 9 A magnified view of region A in the middle. (See image below.) Figure 9 and Figure 10 As shown, taking any two battery cells 20 in the battery device 10 as an example, the two battery cells 20 are the seventh battery cell 207 and the eighth battery cell 208, and taking the example of a breathable adhesive barrier structure 12 extending along the length direction X of the battery cell 20 between the first walls 21 of the two battery cells 20.

[0087] In some embodiments, each battery cell 20 further includes a second wall 22 intersecting the first wall 21. The second walls 22 of two adjacent battery cells 20 are disposed opposite each other. The first wall 21 and the second wall 22 are connected by a rounded corner 211. The breathable and adhesive-resistant structure 12 at least covers the area where the rounded corner 211 of the first wall 21 is located. For example, as Figure 9 and Figure 10 As shown, taking the seventh battery cell 207 with a rounded corner 211 between its first wall 21 and second wall 22, and the eighth battery cell 208 with a similar rounded corner 211 between its first wall 21 and second wall 22 as an example, the second wall 22 of the seventh battery cell 207 and the second wall 22 of the eighth battery cell 208 are positioned opposite each other, i.e., the second wall 22 of the seventh battery cell 207 faces the second wall 22 of the eighth battery cell 208. Therefore, a large gap exists between the rounded corner 211 of the seventh battery cell 207 and the rounded corner 211 of the eighth battery cell 208. Providing a breathable adhesive-blocking structure 12 that at least covers the area where the rounded corner 211 is located can reduce the amount of adhesive 14 entering the gap between the rounded corners 211 of the two battery cells 20, reduce the local stress concentration caused by the accumulation of adhesive 14 in this gap, reduce lithium plating in the battery device 10, and improve the reliability of the battery device 10. Furthermore, the air bubbles 141 of the adhesive 14 can also be discharged through the gap between the rounded corners 211 of the two battery cells 20 through the breathable adhesive barrier structure 12, reducing the probability of a large-area cavity being generated between the first wall 21 of the battery cell 20 and the first housing wall 113, increasing the adhesive bonding area between the first wall 21 of the battery cell 20 and the first housing wall 113, and reducing the amount of adhesive used.

[0088] It should be understood that the breathable adhesive barrier structure 12 of this application embodiment is located between the first wall 21 and the first housing wall 113. When the first wall 21 and the second wall 22 are connected by a rounded corner 211, the "first wall 21" of this application embodiment includes the area where the rounded corner 211 is located, that is, at least a part of the breathable adhesive barrier structure 12 is located between the rounded corner 211 and the first housing wall 113.

[0089] In some embodiments, the breathable adhesive barrier structure 12 of this application can also be used to fill the gaps created by the rounded corners 211 between adjacent battery cells 20. Figure 11 This application shows another enlarged partial structural diagram of any two adjacent battery cells 20 according to an embodiment of the present application, for example, Figure 11 Can be replaced Figure 10 ,Right now Figure 11 It can be Figure 9 Another possible structure for region A. For example... Figure 11As shown, this example still uses the case where a rounded corner 211 is provided between the first wall 21 and the second wall 22 of the seventh battery cell 207, and a rounded corner 211 is also provided between the first wall 21 and the second wall 22 of the eighth battery cell 208. When the second wall 22 of the seventh battery cell 207 and the second wall 22 of the eighth battery cell 208 are positioned opposite each other, the rounded corners 211 of both the seventh and eighth battery cells prevent a tight fit between the corners of the first and second walls 21 and 22 of the seventh battery cell 207 and the eighth battery cell 208, resulting in a large gap between them. Therefore, the breathable adhesive-blocking structure 12 of this embodiment can also be used to fill this gap.

[0090] In some embodiments, the breathable adhesive barrier structure 12 may also be provided with a protruding structure 121, which is located in the gap between adjacent battery cells 20 created by the rounded corner 211, for example, as Figure 11 As shown, the protruding structure 121 can be located in the gap between the rounded corner 211 of the seventh battery cell 207 and the rounded corner 211 of the eighth battery cell 208. Furthermore, the side of the breathable adhesive barrier structure 12 facing the first housing wall 113 can be flush with or slightly protruding towards the first housing wall 113 of the two battery cells 20, so that the side of the breathable adhesive barrier structure 12 facing the first housing wall 113 at least covers the area where the rounded corners 211 of the first walls 21 of the adjacent two battery cells 20 are located.

[0091] In some embodiments, the battery device 10 further includes a buffer 13, a gap 131 disposed between two adjacent battery cells 20, the first gap 23 including the side of the gap 131 facing the first housing wall 113. The buffer 13 can be used to mitigate the deformation of the battery cells 20 during use, for example, as... Figure 9 and Figure 10 As shown, the buffer 13 can be perpendicular to the width direction Y of the battery cell 20, meaning the buffer 13 can be located on the side of the wall with the largest area of ​​the battery cell 20. This allows it to absorb the deformation of the battery cell 20 along the width direction Y, improving structural stability. The buffer 13 is typically sandwiched between two adjacent battery cells 20, meaning there is a gap 131 between the two battery cells 20 to accommodate the buffer 13. The first gap 23 includes the side of the gap 131 facing the first housing wall 113; that is, the size of the first gap 23 includes the thickness of the gap 131. The breathable, adhesive-resistant structure 12 covers the first gap 23 and also covers the side of the gap 131 facing the first housing wall 113 to prevent the adhesive 14 from entering the gap 131.

[0092] In some embodiments of this application, where the buffer 13 is provided between two adjacent battery cells 20, such as Figure 11 As shown, if the breathable and adhesive-blocking structure 12 is provided with a protruding structure 121, the protruding structure 121 can be used to fill the rounded corner 211 between two adjacent battery cells 20 and the gap between the buffer member 13.

[0093] It should be understood that the material of the breathable adhesive barrier structure 12 in this application embodiment can be set according to actual application. For example, the air permeability of the breathable adhesive barrier structure 12 can be set within the range of [5000ml / min / cm]. 2 6000ml / min / cm 2 The air permeability of the breathable adhesive barrier structure 12 should not be too low. For example, the air permeability of this breathable adhesive barrier structure 12 is usually greater than or equal to 5000 ml / min / cm. 2 This allows air bubbles 141 in the adhesive 14 to be quickly expelled through the breathable barrier structure 12. Conversely, the air permeability of the breathable barrier structure 12 should not be too high; for example, the air permeability of the breathable barrier structure 12 is typically less than or equal to 6000 ml / min / cm². 2 This reduces the difficulty of selecting materials for the breathable adhesive barrier structure 12 and saves costs.

[0094] It should be understood that the air permeability of the breathable adhesive barrier structure 12 in the embodiments of this application can be tested in various ways. For example, the air permeability of the breathable adhesive barrier structure 12 can be obtained by testing it in a 7 kPa environment using a Göttingen air permeability tester, but the embodiments of this application are not limited to this.

[0095] In some embodiments, the specific value of the air permeability of the breathable adhesive barrier structure 12 of this application can be set according to actual application. For example, the air permeability of the breathable adhesive barrier structure 12 can be any one of the following values ​​or a value between any two of the following values: 5000ml / min / cm 2 5050ml / min / cm 2 5100ml / min / cm 2 5150ml / min / cm 2 5200ml / min / cm 2 5250ml / min / cm 2 5300ml / min / cm 2 5350ml / min / cm 2 5400ml / min / cm 2 5450ml / min / cm 25500ml / min / cm 2 5550ml / min / cm 2 5600ml / min / cm 2 5650ml / min / cm 2 5700ml / min / cm 2 5750ml / min / cm 2 5800ml / min / cm 2 5850ml / min / cm 2 5900ml / min / cm 2 5950ml / min / cm 2 and 6000ml / min / cm 2 .

[0096] For example, the material of the breathable adhesive barrier structure 12 includes polypropylene and / or polyethylene to facilitate implementation.

[0097] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0098] The electrical equipment can be any of the aforementioned devices or systems that utilize the battery device 10.

[0099] According to some embodiments of this application, see Figures 4 to 10 This application provides a battery device 10, including: a housing 11; a plurality of battery cells 20 arranged along a first direction, the plurality of battery cells 20 being housed within the housing 11, the first wall 21 of each of the plurality of battery cells 20 being fixed to the first housing wall 113 of the housing 11; and a breathable and adhesive-proof structure 12 located between the first wall 21 of two adjacent battery cells 20 and the first housing wall 113, the breathable and adhesive-proof structure 12 being used to cover a first gap 23 between the first walls 21 of two adjacent battery cells 20. The first housing wall 113 is perpendicular to the direction of gravity and is located below the plurality of battery cells 20 along the direction of gravity. The air permeability of the breathable and adhesive-proof structure 12 is within the range of [5000 ml / min / cm]. 2 6000ml / min / cm 2 ].

[0100] The battery device 10 includes a plurality of battery cell groups 200 arranged along a second direction, each battery cell group 200 including a plurality of battery cells 20. A breathable baffle structure 12 is also located between the first wall 21 of two adjacent battery cell groups 200 and the first housing wall 113, and the breathable baffle structure 12 also covers a second gap 24 between the first walls 21 of two adjacent battery cell groups 200. The plurality of adjacent battery cells 20 arranged along the second direction and located in different battery cell groups 200 correspond to the same breathable baffle structure 12.

[0101] Each battery cell 20 also includes a second wall 22 intersecting the first wall 21. The second walls 22 of two adjacent battery cells 20 are arranged opposite each other. The first wall 21 and the second wall 22 are connected by a rounded corner 211. The breathable and adhesive-resistant structure 12 at least covers the area where the rounded corner 211 of the first wall 21 is located. The battery assembly 10 also includes a buffer 13, a gap 131 disposed between two adjacent battery cells 20, and a first gap 23 including the side of the gap 131 facing the first housing wall 113.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body (11); a plurality of battery cells (20) arranged along a first direction, the plurality of battery cells (20) being accommodated in the box body (11), a first wall (21) of each battery cell (20) in the plurality of battery cells (20) being fixed with a first box body wall (113) of the box body (11); a gas-permeable glue-blocking structure (12) located between the first walls (21) of two adjacent battery cells (20) in the plurality of battery cells (20) and the first box body wall (113), the gas-permeable glue-blocking structure (12) being used for covering a first gap (23) between the first walls (21) of the two adjacent battery cells (20).

2. The battery device according to claim 1, characterized by The first box body wall (113) is perpendicular to a direction of gravity, and along the direction of gravity, the first box body wall (113) is located below the plurality of battery cells (20).

3. The battery device of claim 1, wherein Along an extension direction of the first gap (23), a length of the gas-permeable glue-blocking structure (12) is greater than or equal to a length of the first gap (23).

4. The battery device of claim 1, wherein The battery device comprises: a plurality of battery cell groups (200) arranged along a second direction, each battery cell group (200) in the plurality of battery cell groups (200) comprising the plurality of battery cells (20).

5. The battery device of claim 4, wherein, The gas-permeable glue-blocking structure (12) is also located between the first walls (21) of two adjacent battery cell groups (200) in the plurality of battery cell groups (200) and the first box body wall (113), and is used for covering a second gap (24) between the first walls (21) of the two adjacent battery cell groups (200).

6. The battery device of claim 5, wherein Along an extension direction of the second gap (24), a length of the gas-permeable glue-blocking structure (12) is greater than or equal to a length of the second gap (24).

7. The battery device of claim 4, wherein A plurality of adjacent battery cells (20) located in different battery cell groups (200) and arranged along the second direction correspond to the same gas-permeable glue-blocking structure (12).

8. The battery device according to any one of claims 1 to 7, characterized by, The air permeation amount of the air permeable and glue blocking structure (12) is in the range of [5000ml / min / cm 2 , 6000ml / min / cm 2 ].

9. The battery device according to any one of claims 1 to 7, characterized by, A material of the gas-permeable glue-blocking structure (12) comprises polypropylene and / or polyethylene.

10. The battery device according to any one of claims 1 to 7, characterized by, Each battery cell (20) further comprises a second wall (22) intersecting the first wall (21), the second walls (22) of the two adjacent battery cells (20) being oppositely arranged, the first wall (21) and the second wall (22) being connected through a rounded corner (211), and the gas-permeable glue-blocking structure (12) covers at least a region where the rounded corner (211) of the first wall (21) is located.

11. The battery device according to any one of claims 1 to 7, wherein The battery device further comprises: a buffer member (13) arranged in a gap (131) between the two adjacent battery cells (20), the first gap (23) comprising one side of the gap (131) facing the first box body wall (113).

12. An electrical device, characterized by The battery device as claimed in any one of claims 1 to 11 is used for supplying power to the power-consuming device.

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