Battery device, pressing strip and electric equipment

Abstract

The utility model discloses a battery device, a pressing strip and electric equipment, and relates to the technical field of battery devices. The battery device comprises a battery monomer group, an end plate and a pressing strip; the battery monomer group comprises a plurality of battery monomers arranged along a first direction; at least two end plates are oppositely arranged in the first direction, and the two end plates are respectively arranged at the two ends of the battery monomer group; the pressing strip extends in the first direction, and the two ends of the pressing strip are connected with the two end plates correspondingly. Part of the pressing strip is bent to form a protruding part. According to the technical scheme, the problem that the batten is easy to warp after being assembled is solved, so that the single battery expansion resistance of the batten in the first direction is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery device equipment, and particularly relates to a battery device, a pressing strip and an electrical equipment. Background Art

[0002] A battery device usually includes a plurality of battery modules, and each battery module includes a battery cell group and a limiting component for limiting the battery cell group. In some battery devices, the limiting component includes end plates arranged at both ends in the arrangement direction of the battery cells, and a pressing strip with two ends respectively connected to the two end plates. However, due to reasons such as assembly tolerances, the pressing strip is prone to warping after assembly. Summary of the Utility Model

[0003] The main purpose of the present application is to propose a battery device, a pressing strip and an electrical equipment, aiming to improve the problem that the pressing strip is prone to warping after assembly.

[0004] To achieve the above object, the battery device proposed by the present application includes a battery cell group, end plates and a pressing strip; the battery cell group includes a plurality of battery cells arranged in a first direction; at least two end plates are oppositely arranged in the first direction, and two of the end plates are respectively arranged at both ends of the battery cell group; the pressing strip extends along the first direction, and two ends of the pressing strip are respectively connected to the two end plates; a raised portion is formed by bending a part of the pressing strip.

[0005] According to the technical solution of the present application, at least two end plates are oppositely arranged in the first direction, and two of the end plates are respectively arranged at both ends of the battery cell group, so that the end plates can limit the battery cell group formed by a plurality of battery cells arranged in the first direction, thereby improving the stability of the battery cell group in the first direction. By extending the pressing strip along the first direction and connecting the two ends of the pressing strip to the two end plates respectively, on the one hand, the stability of the two end plates oppositely arranged in the first direction is improved, and on the other hand, the pressing strip can limit the battery cell group in other directions except the first direction, thereby improving the stability of the battery cell group.

[0006] In addition, by bending part of the pressure strip to form a bulge, the bulge bulges in a direction that is angled with the first direction, so that when the pressure strip is stretched along the first direction, the bulge can undergo elastic deformation, thereby allowing the pressure strip to expand and contract in the first direction. The length of the pressure strip can be set to be smaller, so that the pressure strip can be stretched in the first direction manually or with the help of tools and the opposite ends of the pressure strip can be connected to the end plates, and when the two ends of the pressure strip are respectively connected to the two end plates, the bulge also has a tendency to restore to its original state, that is, the bulge rebounds to drive the two ends of the pressure strip to have a tendency to retract, so that other parts of the pressure strip are in a more stretched state under the drive of the bulge, reducing the gap between the pressure strip and the battery cell group in the first direction, reducing the risk of the pressure strip being easily deformed and the middle part being easily warped due to the pressure strip being too long after assembly, and improving the ability of the pressure strip to resist battery cell expansion in the first direction.

[0007] In one embodiment of the present application, the pressure strip includes a main body and a connecting portion, the main body extends along the first direction, and the raised portion is formed on the main body; the connecting portion is connected to the main body at an angle, and the connecting portion is connected to the end plate.

[0008] Such an arrangement makes it easier to connect the pressure strip to the end plate, increases the area of ​​connection between the pressure strip and the end plate, and improves the connection strength between the two.

[0009] In one embodiment of the present application, a second direction is defined to be perpendicular to the first direction, and the second direction is parallel to a direction from a side of the main body toward the battery cell group to a side of the main body away from the battery cell group, and the raised portion is raised toward the second direction.

[0010] Such arrangement makes it easy to bend the pressure strip to form the raised portion, whether it is a plate-shaped body or a columnar body, thereby making the manufacturing process of the raised portion more convenient.

[0011] In one embodiment of the present application, the main body includes a flat section and an elastic section, the elastic section is connected to the flat section; the elastic section is provided with the raised portion, the raised portion is provided with at least two, a trough portion is formed between two adjacent raised portions, and the distance from the trough portion to the battery cell is not less than the distance from the flat section to the battery cell.

[0012] Such an arrangement ensures that there is a sufficient gap between the trough of the pressure strip and the battery cell, thereby reducing the risk of creepage.

[0013] In one embodiment of the present application, the raised height of the raised portion is H, 3mm≤H≤7mm.

[0014] Such arrangement ensures that, on the one hand, the raised height of the raised portion will not be too low, thereby enabling the raised portion to have better elastic deformation capability; on the other hand, the raised height of the raised portion will not be too high, thereby reducing the space of the battery device box occupied by the raised portion.

[0015] In one embodiment of the present application, a third direction is defined to be perpendicular to the first direction, and the third direction is perpendicular to a direction from a side of the main body toward the battery cell group to a side of the main body away from the battery cell group; the raised portion is raised toward the third direction.

[0016] Such an arrangement can reduce the situation where the raised portion occupies more space in the box of the battery device.

[0017] In one embodiment of the present application, each of the battery cells is provided with a first pole lug on a side facing the pressure strip, and a plurality of the first pole lugs are arranged along the first direction; at least two raised portions are provided, and all the raised portions are raised in the direction of the first pole lug.

[0018] Such arrangement can, on the one hand, reduce the space occupied by the pressure strip in the width direction of the pressure strip, and on the other hand, can also reduce the cost of the pressure strip.

[0019] In an embodiment of the present application, a distance between the raised portion and the first electrode tab is D, and D is ≥ 5 mm.

[0020] Such an arrangement ensures that there is a sufficient safety gap between the raised portion and the first electrode tab, thereby reducing the risk of electrical connection between the raised portion and the first electrode tab.

[0021] In one embodiment of the present application, the main body has a mid-vertical plane perpendicular to the first direction, and the raised portions are symmetrically arranged with respect to the mid-vertical plane.

[0022] With such an arrangement, when the user stretches the pressure strip at both ends in the first direction, the deformation degrees of the raised portions on the opposite sides of the mid-vertical plane are similar, so that the stretching forces at various positions in the main body where no raised portions are provided are the same, and the stresses at various positions are the same, thereby reducing the risk of damage to local positions that are easily pulled.

[0023] In one embodiment of the present application, at least one protrusion is disposed in the middle of the main body.

[0024] Such an arrangement can, on the one hand, make the stresses on the two ends of the main body more balanced, and on the other hand, further reduce the risk of warping in the middle of the pressure strip.

[0025] In one embodiment of the present application, the connecting portion is detachably connected to the end plate.

[0026] With such a setting, it is convenient to disassemble and assemble the pressure strip, thus facilitating the replacement of the pressure strip.

[0027] The present application also provides a pressure strip applied to a battery device. The pressure strip extends along a first direction, and a part of the pressure strip is bent to form a raised portion, and the raised portion bulges in a direction forming an angle with the first direction.

[0028] In the present application, by bending a part of the pressure strip to form a raised portion, and the raised portion bulges in a direction forming an angle with the first direction, when the pressure strip is stretched along the first direction, the raised portion can undergo elastic deformation, and further the pressure strip can expand and contract in the first direction. The length of the pressure strip can be set to be relatively small, so that the pressure strip can be stretched manually or with the aid of tools in the first direction and the opposite ends of the pressure strip can be connected to the end plates on the battery device to which the pressure strip is applied. And when the two ends of the pressure strip are respectively connected to the two end plates, the raised portion still has a tendency to return to its original state, that is, the raised portion rebounds to drive the two ends of the pressure strip to have a tendency to retract, so that other parts of the pressure strip are in a more straightened state under the drive of the raised portion, reducing the gap between the pressure strip and the battery cell group in the battery device in the first direction, reducing the risk that the pressure strip is prone to deformation and its middle part is prone to warping due to the excessive length of the pressure strip after assembly, and improving the ability of the pressure strip to resist the expansion of the battery cell in the first direction.

[0029] The present application also provides an electrical equipment including the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0031] Figure 1 Structural schematic diagram of a vehicle according to some embodiments of the present application;

[0032] Figure 2 Exploded structural schematic diagram of a battery device according to some embodiments of the present application;

[0033] Figure 3 Exploded structural schematic diagram of a battery cell according to some embodiments of the present application;

[0034] Figure 4 Assembly drawing of a battery device according to some embodiments of the present application;

[0035] Figure 5Schematic diagram of the pressing strip in the battery device according to some embodiments of the present application;

[0036] Figure 6 is Figure 5 partial enlarged view of part A in;

[0037] Figure 7 Assembly drawing of the battery device according to other embodiments of the present application;

[0038] Figure 8 Schematic diagram of the pressing strip in the battery device according to other embodiments of the present application;

[0039] Figure 9 is Figure 7 partial enlarged view of part B in.

[0040] Explanation of the reference numerals in the drawings:

[0041] 1000, vehicle;

[0042] 100, battery device; 200, controller; 300, motor;

[0043] 1, box body; 11, first part; 12, second part;

[0044] 2, battery cell group; 20, battery cell; 21, end cover; 21a, electrode terminal; 22, housing; 23, cell assembly; 231, tab; 231a, first tab;

[0045] 3, end plate;

[0046] 4, pressing strip; 41, main body part; 411, flat plate section; 412, elastic section; 401, raised part; 42, connecting part;

[0047] X, first direction;

[0048] Y, second direction;

[0049] Z, third direction.

[0050] The realization, functional features and advantages of the purpose of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0052] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this application, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0053] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of this application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0054] The embodiments of this application provide an electrical device using a battery device as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and so on. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and so on. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and so on.

[0055] For the convenience of description in the following embodiments, a vehicle 1000 in an embodiment of this application is taken as an example for illustration.

[0056] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0057] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0058] Please refer to Figure 2 and Figure 3 , Figure 2 which is the explosion diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes battery cells 20. In the battery device 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, parallel, or in a combination of series and parallel to form a battery cell group 2. A combination of series and parallel means that there are both series and parallel connections among the multiple battery cells 20. The battery device 100 can also include a box body 1, and the battery cells 20 are accommodated in the box body 1. The multiple battery cells 20 can be directly connected in series, parallel, or in a combination of series and parallel together, and then the battery cell group 2 formed by the multiple battery cells 20 is accommodated in the box body 1; of course, the battery device 100 can also be in the form that multiple battery cells 20 are first connected in series, parallel, or in a combination of series and parallel to form a battery cell group 2, and then a limiting component is provided to limit the circumferential direction of the battery cell group 2 to jointly form a battery module with the battery cell group 2. Multiple battery modules are then connected in series, parallel, or in a combination of series and parallel to form an integral body and are accommodated in the box body 1. Among them, the box body 1 is used to provide an accommodation space for the battery cells 20, and the box body 1 can adopt various structures. In some embodiments, the box body 1 can include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define the accommodation space; the first part 11 and the second part 12 can also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 1 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0059] The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection between the multiple battery cells 20.

[0060] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0061] Please refer to Figure 2 andFigure 3 , Figure 3 is a schematic exploded view of the battery cell 20 provided by some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery device 100. As Figure 3 , the battery cell 20 includes an end cap 21, a housing 22, a battery core assembly 23, and other functional components.

[0062] The end cap 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to cooperate with the housing 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used for electrically connecting with the battery core assembly 23 to output or input the electric energy of the battery cell 20. In some embodiments, a pressure relief mechanism for discharging the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap 21. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 21, and the insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0063] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the battery core assembly 23, the electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 is covered on the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 can also be integrated. Specifically, the end cap 21 and the housing 22 can first form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then covered on the housing 22. The housing 22 can be of various shapes and various sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the battery core assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this.

[0064] The battery cell assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. One or more battery cell assemblies 23 may be included within the housing 22. The battery cell assembly 23 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet having the active material constitute the main body of the battery cell assembly 23, and the portions of the positive electrode sheet and the negative electrode sheet without the active material respectively constitute the electrode tabs 231. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 231 are connected to the electrode terminals 21a to form a current loop.

[0065] In some embodiments, when the battery device 100 includes a limiting assembly, the limiting assembly includes end plates provided at both ends in the arrangement direction of the battery cells 20 and a pressing strip connecting the two end plates. However, in the related art, the pressing strip generally includes a long strip-shaped flat plate portion, and the end of the flat plate portion is bent to form a bent portion and is connected to the end plate, where the flat plate portion cannot be elastically stretched in its extending direction. Due to assembly tolerances, the distance between the two ends of the flat plate portion cannot be adjusted. Therefore, when there are assembly tolerance problems, it may occur that the pressing strip is too long, and after the bent portion of the pressing strip is connected to the end plate, the entire flat plate portion of the pressing strip warps upward, resulting in an interference phenomenon in its assembly with the upper cover. Additionally, the pressing strip also has a relatively weak anti-expansion ability in its length extending direction.

[0066] Please refer to Figures 2 to 9 , in order to improve the problem that the pressing strip is prone to warping after assembly, the present application proposes a battery device 100. The battery device 100 includes a battery cell group 2, end plates 3, and a pressing strip 4; the battery cell group 2 includes a plurality of battery cells 20 arranged along the first direction X; at least two end plates 3 are oppositely arranged in the first direction X, and two of the end plates 3 are respectively provided at both ends of the battery cell group 2; the pressing strip 4 extends along the first direction X, and both ends of the pressing strip 4 are respectively connected to the two end plates 3; a raised portion 401 is formed by bending a part of the pressing strip 4.

[0067] The battery cell group 2 refers to an assembly formed by connecting a plurality of battery cells 20 arranged along the first direction X in series, in parallel, or in a mixed connection. The battery cell group 2 may include two, three, or more battery cells 20.

[0068] The end plate 3 refers to a plate structure disposed at both ends of the battery cell group 2 along the first direction X. The end plate 3 is used to limit both ends of the battery cell group 2 in the first direction X. The material of the end plate 3 can be a metal material or a non-metal material. There can be two end plates 3, and the two end plates 3 are respectively disposed at opposite ends of the battery cell group 2 in the first direction X. Or there can be three, four or more end plates 3, so that at least one of the opposite ends of the battery cell group 2 in the first direction X is stacked with at least two end plates 3 to improve the limiting effect of the battery cell group 2 and the effect of isolation from the outside. The end plate 3 can be rectangular, circular or other special-shaped. It should be noted that in the battery device 100, there can be at least two end plates 3 disposed only opposite to each other in the first direction X; or in other examples, the battery device 100 can further include a limiting member disposed in other directions at an angle to the first direction X to limit the battery cell group 2 in other directions.

[0069] The pressing strip 4 refers to a limiting member used to limit one side of the battery cell group 2 where the above-mentioned end plate 3 is not provided. The material of the pressing strip 4 can be a metal material or a non-metal material. The pressing strip 4 extends along the first direction X, and both ends of the pressing strip 4 are respectively connected to the two end plates 3. Taking the first direction X as the front-back direction as an example, the pressing strip 4 can be disposed on at least one of the top, left side and right side of the battery cell group 2. There can be one pressing strip 4, and the pressing strip 4 can be disposed on the top, left side or right side of the battery cell group 2; or there can be at least two pressing strips 4, and all the pressing strips 4 are disposed on the same side of the battery cell group 2, for example, all the pressing strips 4 are disposed on the top, left side or right side of the battery cell group 2; or at least one pressing strip 4 is disposed on the top, left side or right side of the battery cell group 2. The pressing strip 4 can only include a strip-shaped plate body, and connecting structures such as connection holes, connection posts or buckles are provided at opposite ends of the plate body to connect with the end plate 3; or the pressing strip 4 can include a straight-line-shaped plate body and a connecting plate or connecting block connected at an angle to the plate body, and connecting structures such as connection holes, connection posts or buckles are provided on the connecting plate or connecting block to connect with the end plate 3; wherein the connecting plate or connecting block and the plate body can be integrally formed or connected together by welding or other means. It should be noted that the edge of the strip-shaped plate body in the pressing strip 4 can be straight, serrated or wavy, etc.

[0070] The raised portion 401 refers to a portion formed on the pressure strip 4 to have elastic deformation. Taking the first direction X as the front-back direction as an example for illustration, in the present application, the raised portion 401 bulges in a direction forming an angle with the first direction X. Then, the raised portion 401 can bulge in the up-down direction or can bulge in the left-right direction. The raised portion 401 can be in a U shape, an arc shape, a V shape, an S shape, etc., or the raised portion 401 can be provided with one, two, or more. When at least two raised portions 401 are provided, the at least two raised portions 401 can be connected end to end or can be arranged at intervals.

[0071] In the technical solution of the present application, at least two end plates 3 are oppositely arranged in the first direction X, and the two end plates 3 are respectively arranged at both ends of the battery cell group 2. Then, the end plates 3 can limit the battery cell group 2 formed by a plurality of battery cells 20 arranged in the first direction X, thereby improving the stability of the battery cell group 2 in the first direction X. By extending the pressure strip 4 in the first direction X and connecting the two ends of the pressure strip 4 to the two end plates 3 respectively, on the one hand, the stability of the two end plates 3 oppositely arranged in the first direction X is improved, and on the other hand, the pressure strip 4 can also limit the battery cell group 2 in other directions except the first direction X, thereby improving the stability of the battery cell group 2. In addition, by bending a part of the pressure strip 4 to form a raised portion 401, the raised portion 401 bulges in a direction forming an angle with the first direction X. Thus, when the pressure strip 4 is stretched in the first direction X, the raised portion 401 can undergo elastic deformation, and further, the pressure strip 4 can be telescoped in the first direction X. The length of the pressure strip 4 can be set to be a little smaller, so that the pressure strip 4 can be stretched manually or with the aid of tools in the first direction X and the opposite ends of the pressure strip 4 can be connected to the end plates 3. And when the two ends of the pressure strip 4 are respectively connected to the two end plates 3, the raised portion 401 also has a tendency to return to its original state, that is, the raised portion 401 rebounds to drive the two ends of the pressure strip 4 to have a tendency to retract, so that other parts of the pressure strip 4 are in a more straightened state under the drive of the raised portion 401, reducing the gap between the pressure strip 4 and the battery cell group 2 in the first direction X, reducing the risk that the pressure strip 4 is easily deformed and its middle part is easily warped due to the excessive length of the pressure strip 4 after assembly, and improving the ability of the pressure strip 4 to resist the expansion of the battery cell 20 in the first direction X.

[0072] Please refer to Figures 4 to 8 , in an embodiment of the present application, the pressure strip 4 includes a main body portion 41 and a connecting portion 42. The main body portion 41 extends in the first direction X, and the raised portion 401 is formed on the main body portion 41; the connecting portion 42 is connected to the main body portion 41 at an angle, and the connecting portion 42 is connected to the end plate 3.

[0073] The main body portion 41 refers to the portion for limiting the battery cell group 2 in a direction forming an angle with the first direction X. Taking the first direction X as the front-rear direction as an example, when the pressing strip 4 is provided on the top of the battery cell group 2, the main body portion 41 of the pressing strip 4 is the portion opposite to the top of the battery cell group 2; when the pressing strip 4 is provided on the left or right side of the battery cell group 2, the main body portion 41 of the pressing strip 4 is located at the portion opposite to the left or right side of the battery cell group 2. The main body portion 41 can be a plate-like body or a columnar body, etc.

[0074] The connecting portion 42 refers to the portion connected to the end of the main body portion 41. The connecting portion 42 can be disposed opposite to the end plate 3 to be connected to the end plate 3. The connecting portion 42 can be a connecting column or a connecting piece, etc. For example, when the connecting portion 42 is a connecting piece, the connecting piece can be disposed on the side of the end plate 3 facing away from the battery cell group 2, and the connecting piece can be a flat plate or an L-shaped plate-like body, etc. The connecting piece can be connected to the end plate 3 by screws, snap connections or other means. Or the connecting portion 42 can be a connecting column, and the connecting column can be inserted or threadedly connected to the end plate 3, etc. As long as the effect that the connecting portion 42 can be connected to the end plate 3 can be achieved.

[0075] By extending the main body portion 41 along the first direction X, and a raised portion 401 is provided on the main body portion 41. When the user stretches the main body portion 41 along the first direction X, the raised portion 401 is stretched and deformed, and the main body portion 41 can drive the connecting portion 42 to extend towards both ends of the battery cell group 2 together, so as to facilitate the connection between the connecting portion 42 and the end plate 3. After the connecting portion 42 is connected to the end plate 3, the raised portion 401 has an elastic force that causes the main body portion 41 to retract in the reverse direction, thereby making the main body portion 41 more tend to be in a straightened state, reducing the gap between the pressing strip 4 and the battery cell group 2, reducing the risk of the pressing strip 4 warping, and improving the anti-expansion ability of the pressing strip 4. In addition, by providing the main body portion 41 and the connecting portion 42, it is convenient for the pressing strip 4 to be connected to the end plate 3, and the connection area between the pressing strip 4 and the end plate 3 is increased, improving the connection strength between the two.

[0076] Please refer to Figures 4 to 6 , in an embodiment of the present application, it is defined that the second direction Y is perpendicular to the first direction X, and the second direction Y is parallel to the direction from the side of the main body portion 41 facing the battery cell group 2 to the side of the main body portion 41 facing away from the battery cell group 2, and the raised portion 401 bulges in the second direction Y.

[0077] Taking the first direction X as the front-back direction as an example for illustration, when the pressing strip 4 is provided on the top of the battery cell group 2, the second direction Y is the direction from the bottom to the top of the battery cell group 2 or the direction from the top to the bottom of the battery cell group 2. At this time, the raised portion 401 bulges towards the top or bottom direction. When the pressing strip 4 is provided on the left side of the battery cell 20, the second direction Y is the direction from the right side to the left side of the battery cell 20 or the direction from the left side to the right side. At this time, the raised portion 401 bulges towards the left side or the right side. When the pressing strip 4 is provided on the right side of the battery cell 20, the second direction Y is also the direction from the left side to the right side of the battery cell 20 or the direction from the right side to the left side. At this time, the raised portion 401 bulges towards the left side or the right side.

[0078] By arranging the raised portion 401 to bulge in the second direction Y, it is convenient to bend the pressing strip 4 to form the raised portion 401 whether the pressing strip 4 is a plate-shaped body or a columnar body, thus making the manufacturing process of the raised portion 401 more convenient.

[0079] Please refer to Figures 4 to 6 , in an embodiment of the present application, the main body portion 41 includes a flat plate section 411 and an elastic section 412. The elastic section 412 is connected to the flat plate section 411; at least two raised portions 401 are provided on the elastic section 412, and a wave valley portion is formed between two adjacent raised portions 401. The distance from the wave valley portion to the battery cell 20 is not less than the distance from the flat plate section 411 to the battery cell 20.

[0080] The flat plate section 411 refers to the part of the main body portion 41 where the raised portion 401 is not provided, and the plate surface of the flat plate section 411 facing the battery cell group 2 is a plane. Specifically, the edge of the flat plate section 411 can be linear, serrated or wavy, etc. It should be noted that the distance from the flat plate section 411 to the battery cell 20 refers to the distance from the side of the flat plate section 411 facing the battery cell 20 to the plane of the battery cell 20 closest to the pressing strip 4.

[0081] The elastic section 412 refers to the part of the main body section where the raised portion 401 is provided so as to have an elastic stretching effect. The elastic section 412 can be provided in the middle, and there are two flat plate sections 411. The two flat plate sections 411 are respectively connected to the two ends of the elastic section 412, and the ends of the two flat plate sections 411 away from the elastic section 412 are respectively connected to two connecting portions 42. Or the elastic section 412 can be provided at the end, that is, one end of the flat plate section 411 is connected to one end of the elastic section 412, the other end of the elastic section 412 is connected to a connecting portion 42, and the original end of the flat plate section 411 where the elastic section 412 is located is connected to the other connecting portion 42.

[0082] The trough part refers to the part between two raised parts 401. The trough part can be arc-shaped, U-shaped, V-shaped or other shapes. It should be noted that the distance from the trough part to the battery cell 20 refers to the distance from the closest point of the trough part to the battery cell 20 to the plane of the battery cell 20 closest to the pressing strip 4.

[0083] By making the distance from the trough part to the battery cell 20 not less than the distance from the flat section 411 to the battery cell 20, there is enough clearance between the trough part of the pressing strip 4 and the battery cell 20, thus reducing the risk of creepage.

[0084] Please refer to Figure 5 and Figure 6 In an embodiment of the present application, the raised height H of the raised part 401 is 3 mm ≤ H ≤ 7 mm.

[0085] The raised height of the raised part 401 refers to the distance when the pressing strip 4 bulges away from the battery cell 20, that is, the distance from the farthest point on the side of the raised part 401 facing the battery cell 20 to the surface of the part of the pressing strip 4 without the raised part 401 facing the battery cell 20.

[0086] Specifically, the raised height H of the raised part 401 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm or 7 mm, etc. As long as the raised height H of the raised part 401 is within the range of 3 mm ≤ H ≤ 7 mm.

[0087] With such a setting, on the one hand, the raised height of the raised part 401 will not be too low, so that the raised part 401 can have better elastic deformation ability; on the other hand, the raised height of the raised part 401 will not be too high to reduce the space it occupies in the box body 1 of the battery device 100.

[0088] Please refer to Figure 7 and Figure 8 In an embodiment of the present application, it is defined that the third direction Z is perpendicular to the first direction X, and the third direction Z is perpendicular to the direction from the side of the main body part 41 close to the battery cell group 2 to the side far from the battery cell group 2; the raised part 401 bulges in the third direction Z.

[0089] Taking the first direction X as the front-back direction and the second direction Y as the up-down direction, the direction that forms an angle with both the first direction X and the second direction Y can be the left-right direction, that is, the width direction of the pressing strip 4.

[0090] By making the raised part 401 bulge in the third direction Z, that is, the raised part 401 bulges along the width direction of the pressing strip 4, in this case, the situation where the raised part 401 occupies more space in the box body 1 of the battery device 100 can be reduced.

[0091] Please refer to Figures 7 to 9 , in an embodiment of the present application, on one side of each battery cell 20 facing the pressure strip 4, a first tab 231a is provided, and a plurality of first tabs 231a are arranged along the first direction X; there are at least two raised portions 401, and all the raised portions 401 bulge in the direction of the first tab 231a.

[0092] It can be understood that the battery cell 20 has a positive tab and a negative tab, and the positive tab and the negative tab can be provided on the same side of the battery cell 20, or can be respectively provided on opposite sides of the battery cell 20. When the battery cell 20 in the present application further includes a second tab, one of the first tab 231a and the second tab is the positive tab, and the other is the negative tab. When both the first tab 231a and the second tab are provided on the same side of the battery cell 20, the pressure strip 4 can be provided between the first tab 231a and the second tab, or the pressure strip 4 can be provided on the side of the first tab 231a away from the second tab.

[0093] By bulging all the raised portions 401 in the direction of the first tab 231a, on the one hand, the space occupied by the pressure strip 4 in the width direction of the pressure strip 4 can be reduced, and on the other hand, the cost of the pressure strip 4 can also be reduced.

[0094] Please refer to Figure 7 and Figure 9 , in an embodiment of the present application, the distance between the raised portion 401 and the first tab 231a is D, and D≥5mm.

[0095] The distance between the raised portion 401 and the first tab 231a refers to the distance from the closest point of the raised portion 401 closest to the first tab 231a to the side of the first tab 231a close to the raised portion 401.

[0096] By setting the distance D between the raised portion 401 and the first tab 231a to be not less than 5mm, there is a sufficient safety gap between the raised portion 401 and the first tab 231a, reducing the risk of electrical connection between the raised portion 401 and the first tab 231a.

[0097] Please refer to Figure 5 and Figure 8 , in an embodiment of the present application, the main body portion 41 has a midplane perpendicular to the first direction X, and the raised portions 401 are symmetrically arranged with respect to the midplane.

[0098] The central vertical plane refers to a central plane that is perpendicular to the first direction X and passes through the center of the main body portion 41. The raised portion 401 is symmetrically arranged with respect to the central vertical plane, which may mean that the raised portion 401 itself is symmetrically arranged with respect to the central vertical plane, or that multiple raised portions 401 are symmetrically distributed with respect to the central vertical plane. For example, when there is one raised portion 401, the raised portion 401 itself is symmetrically arranged with respect to the central vertical plane; when there are two raised portions 401, the two raised portions 401 are symmetrically distributed with respect to the central vertical plane.

[0099] By symmetrically arranging the raised portion 401 with respect to the central vertical plane, when the user stretches the two ends of the pressure strip 4 in the first direction X, the deformation degrees of the raised portions 401 on the two opposite sides of the central vertical plane are quite the same, so that the tensile forces at each position in the main body portion 41 where there is no raised portion 401 are the same, and thus the stresses received at each position are the same, reducing the risk of damage easily occurring when the local position is easily pulled.

[0100] Please refer to Figure 5 and Figure 8 , in an embodiment of the present application, at least one raised portion 401 is provided in the middle of the main body portion 41.

[0101] By providing at least one raised portion 401 in the middle of the main body portion 41, on the one hand, the stresses received at the two ends of the main body portion 41 can be made more balanced, and on the other hand, the risk of the middle of the pressure strip 4 warping up can be further reduced.

[0102] Of course, in other examples, at least one raised portion 401 may also be provided at each of the two ends of the main body portion 41 along the first direction X.

[0103] Please refer to Figure 4 and Figure 6 , in an embodiment of the present application, the connecting portion 42 is detachably connected to the end plate 3.

[0104] The connecting portion 42 and the end plate 3 can be connected by means such as screw connection, snap connection or plug connection.

[0105] By detachably connecting the connecting portion 42 to the end plate 3, it is convenient to disassemble and assemble the pressure strip 4, and thus it is convenient to replace the pressure strip 4.

[0106] Please refer to Figure 5 , Figure 6 and Figure 7, the present application also provides a pressing strip 4, which is applied to the battery device 100. The specific structure of the pressing strip 4 refers to the above embodiments. Since the pressing strip 4 adopts all the technical solutions of the pressing strip 4 in the above embodiments, it has at least all the beneficial effects brought by the pressing strip 4 in the above embodiments. Specifically, the pressing strip 4 extends along the first direction X, and a raised portion 401 is formed by bending a part of the pressing strip 4, and the raised portion 401 bulges in a direction forming an angle with the first direction X.

[0107] The pressing strip 4 can be applied to the above-mentioned battery device 100; it can also be applied to other battery devices 100.

[0108] The first direction X can be the front-back direction, the left-right direction or the up-down direction. For example, when the first direction X is the front-back direction, the raised portion 401 can bulge in the upward or downward direction, or can bulge in the left or right direction. When the first direction X is the left-right direction, the raised portion 401 can bulge in the upward or downward direction, or can bulge in the forward or backward direction.

[0109] The raised portion 401 refers to a portion formed on the pressing strip 4 and having elastic deformation. Taking the first direction X as the front-back direction as an example for illustration, in the present application, the raised portion 401 bulges in a direction forming an angle with the first direction X, then the raised portion 401 can bulge in the up-down direction, or can bulge in the left-right direction. The raised portion 401 can be in a U shape, an arc shape, a V shape or an S shape, etc., or the raised portion 401 can be provided with one, two or more. When there are at least two raised portions 401, the at least two raised portions 401 can be connected end to end, or can be arranged at intervals.

[0110] By bending a part of the pressing strip 4 to form the raised portion 401, and the raised portion 401 bulges in a direction forming an angle with the first direction X, when the pressing strip 4 is stretched along the first direction X, the raised portion 401 can undergo elastic deformation, and then the pressing strip 4 can expand and contract in the first direction X. The length of the pressing strip 4 can be set to be a little smaller, so that the pressing strip 4 can be stretched manually or with the help of tools in the first direction X and the opposite ends of the pressing strip 4 can be connected to the end plates 3 on the battery device 100 to which the pressing strip 4 is applied. And when the two ends of the pressing strip 4 are respectively connected to the two end plates 3, the raised portion 401 still has a tendency to return to its original state, that is, the raised portion 401 rebounds to drive the two ends of the pressing strip 4 to have a tendency to retract, so that other parts of the pressing strip 4 are in a more straightened state under the drive of the raised portion 401, reducing the gap between the pressing strip 4 and the battery cell group 2 in the battery device 100 in the first direction X, reducing the risk that the pressing strip 4 is prone to deformation and its middle part is prone to warping due to the excessive length of the pressing strip 4 after assembly, and improving the ability of the pressing strip 4 to resist the expansion of the battery cell 20 in the first direction X.

[0111] The present application also provides an electrical device. The electrical device includes a battery device 100, and the specific structure of the battery device 100 may refer to the foregoing embodiments. Since the present electrical device adopts all the technical solutions of the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one. Specifically, the electrical device may be any of the foregoing devices or systems using the battery device 100.

[0112] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell group, the battery cell group comprising a plurality of battery cells arranged along a first direction; End plates, at least two of which are arranged opposite to each other in the first direction, wherein the two end plates are respectively arranged at two ends of the battery cell group; as well as A pressure strip extending along the first direction, with two ends of the pressure strip respectively connected to the two end plates; a portion of the pressure strip is bent to form a raised portion, wherein the raised portion is raised in a direction forming an angle with the first direction.

2. The battery device according to claim 1, characterized in that: The layering strip comprises: a main body portion extending along the first direction, the ridge portion being formed on the main body portion; and A connecting portion, wherein the connecting portion is connected to the main body portion at an angle, and the connecting portion is connected to the end plate.

3. The battery device according to claim 2, characterized in that: A second direction is defined to be perpendicular to the first direction and parallel to a direction from a side of the main body toward the battery cell group to a side of the main body away from the battery cell group; the raised portion is raised toward the second direction.

4. The battery device according to claim 3, characterized in that: The main body includes a flat section and an elastic section, wherein the elastic section is connected to the flat section; the elastic section is provided with the raised portion, and at least two raised portions are provided, a trough portion is formed between two adjacent raised portions, and the distance from the trough portion to the battery cell is not less than the distance from the flat section to the battery cell; And / or, the raised portion has a raised height H, 3mm≤H≤7mm.

5. The battery device according to claim 2, characterized in that: A third direction is defined to be perpendicular to the first direction, and the third direction is perpendicular to a direction from a side of the main body toward the battery cell group to a side of the main body away from the battery cell group; the raised portion is raised toward the third direction.

6. The battery device according to claim 5, characterized in that A first pole lug is provided on a side of each battery cell facing the pressure strip, and a plurality of the first pole lugs are arranged along the first direction; at least two protrusions are provided, and all the protrusions protrude toward the direction of the first pole lug.

7. The battery device according to claim 6, characterized in that: The distance between the raised portion and the first pole ear is D, and D≥5mm.

8. The battery device according to any one of claims 2 to 7, characterized in that: The main body has a mid-vertical plane perpendicular to the first direction, and the raised parts are symmetrically arranged with respect to the mid-vertical plane.

9. The battery device according to claim 8, characterized in that: At least one protrusion is disposed in the middle of the main body.

10. The battery device according to any one of claims 2 to 7, characterized in that: The connecting portion is detachably connected to the end plate.

11. A layering strip, characterized in that: Applied to a battery device, the pressure strip extends along a first direction, a portion of the pressure strip is bent to form a raised portion, and the raised portion is raised in a direction forming an angle with the first direction.

12. An electrical device, characterized in that: A battery device comprising the battery device as claimed in any one of claims 1 to 10.

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