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, a pressing strip and a locking piece, 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, a connecting part is arranged at the end of the pressing strip, a long-strip-shaped connecting hole is formed in the connecting part and penetrates through the connecting part in the length extending direction of the connecting hole, and an included angle is formed between the length extending direction and the first direction. The locking piece penetrates through the connecting hole in the length extending direction and is connected to the end plate. According to the technical scheme, the risk of pressing strip breakage is reduced.

Description

Technical Field

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

[0002] A battery device usually includes several battery modules, which include a battery cell group and a limiting assembly for limiting the position of the battery cell group. In some battery devices, the limiting assembly includes end plates arranged at both ends along the arrangement direction of the battery cells and pressure strips connecting the two end plates at both ends, and the ends of the pressure strips are folded and connected to the end plates by bolts. The battery cell group will expand during the charging or discharging process, and the flange of the pressure strip will be subjected to the expansion force and transmitted to the bolts. The traditional locking method of the pressure strip easily leads to the concentration of force between the pressure strip and the bolt, thus posing the risk of the pressure strip breaking. Utility Model Content

[0003] The main purpose of the present application is to provide a battery device, a pressure strip and an electrical device, aiming to improve the problem that the pressure strip is easily broken.

[0004] To achieve the above-mentioned purpose, the battery device proposed in the present application includes a battery cell group, an end plate, a pressure strip and a locking member. The battery cell group includes a plurality of battery cells arranged along a first direction. At least two end plates are arranged opposite to each other in the first direction, wherein the two end plates are respectively arranged at the two ends of the battery cell group. The pressure strip extends along the first direction, and a connecting portion is provided at the end of the pressure strip, and the connecting portion is provided with a long strip-shaped connecting hole, and the connecting hole passes through the connecting portion along its length extension direction, and the length extension direction is arranged at an angle with the first direction. The locking member is passed through the connecting hole along the length extension direction and is connected to the end plate.

[0005] The technical solution of the present application arranges at least two end plates in a first direction relative to each other, wherein the two end plates are respectively arranged at the two ends of the battery cell group, so that the end plates can limit the battery cell group formed by multiple battery cells arranged along the first direction, thereby improving the stability of the battery cell group in the first direction. By extending the pressure strip along the first direction, and connecting the two ends of the pressure strip to the two end plates respectively, on the one hand, the stability of the two end plates arranged relative to each other in the first direction is improved, and on the other hand, the pressure strip can limit the battery cell group in directions other than the first direction, thereby improving the stability of the battery cell group.

[0006] In addition, a connecting portion is provided at the end of the pressure strip, and the connecting portion is provided with an elongated connecting hole, the connecting hole passes through the connecting portion along its length extension direction, the length extension direction is set at an angle to the first direction, and the locking member is passed through the connecting hole along the length extension direction and connected to the end plate, so that the contact area between the locking member and the inner wall of the connecting hole is increased, thereby increasing the force-bearing area between the locking member and the connecting portion, reducing the risk of stress concentration between the locking member and the connecting portion, and thereby improving the problem of fracture at the connection portion between the locking member and the pressure strip.

[0007] In an embodiment of the present application, an end portion of the pressure strip is rolled up to form the connecting portion.

[0008] Such an arrangement improves the connection strength of the connection portion and increases the thickness of the end of the layering strip, thereby reducing the risk of the layering strip breaking.

[0009] In one embodiment of the present application, the pressure strip includes a main body and a folded portion. The main body extends along the first direction. The folded portion is connected to the end of the main body at an angle and is provided on a side of the end plate away from the battery cell group. The folded portion is provided on a side of the end plate away from the battery cell group, and one end of the folded portion away from the main body is wound to form the connecting portion.

[0010] In this way, the battery cell group is located between the folded parts at both ends of the main body, so that the folded parts further limit the two ends of the battery cell group along the first direction, thereby improving the stability of the battery device. By winding the folded part away from the end of the main body to form a connecting part, the molding process of the connecting part is more convenient.

[0011] In one embodiment of the present application, the folded portion is disposed on a side of the end plate away from the battery cell group, and one end of the folded portion away from the main body is wound in a direction away from the end plate to form the connecting portion.

[0012] This arrangement can further reduce the risk of the folding portion contacting the battery cell group, and the folding portion can have a good limiting effect on the battery cell group and the end plate in the first direction, thereby improving the stability of the end plate and the battery cell group. In addition, the length of the main body of the pressure strip can be reduced, thereby reducing the cost of the pressure strip.

[0013] In an embodiment of the present application, the length extension direction is perpendicular to the first direction.

[0014] With such an arrangement, the volume of the battery device can be reduced.

[0015] In one embodiment of the present application, the end plate is provided with a boss, the boss is provided at the end of the connecting portion, and the locking member passes through the connecting portion and is connected to the boss.

[0016] Such an arrangement can reduce the number of holes opened on the end plate body or reduce the size of the holes opened on the end plate, thereby avoiding reducing the strength of the end plate. In addition, the length of the locking member can be set shorter, thereby reducing the space occupied by the locking member.

[0017] In one embodiment of the present application, the locking member is a threaded rod, and the locking member is threadedly connected to the boss.

[0018] Such an arrangement makes it easy to replace the pressure strip provided with the connecting portion, and can also ensure that the connection between the connecting portion and the boss is relatively stable.

[0019] In an embodiment of the present application, the battery device further includes a threaded sleeve, which is connected to the boss and threadedly connected to the locking member.

[0020] Such an arrangement reduces the risk of damaging the strength of the boss.

[0021] In one embodiment of the present application, the boss is provided with a through hole, the through hole is connected to the connecting hole, and the threaded sleeve is embedded in the through hole.

[0022] Such an arrangement can reduce the situation where the threaded rod is too long due to the threaded rod being inserted into the end of the boss away from the connecting portion, thereby reducing the space occupied by the threaded rod.

[0023] In an embodiment of the present application, at least two bosses are provided at intervals along the length extension direction, and at least two bosses are respectively provided at two opposite ends of the connecting portion.

[0024] Such an arrangement reduces the risk of the connection portion moving in the direction of its length extension, thereby ensuring that the pressure strip has good stability.

[0025] The present application also proposes a pressure strip, which is applied to a battery device. The pressure strip extends along a first direction. A connecting portion is provided at the end of the pressure strip. The connecting portion is provided with a long strip-shaped connecting hole. The connecting hole passes through the connecting portion along its length extension direction.

[0026] In the present application, a connecting portion is provided at the end of the layering strip, and the connecting portion is provided with a long strip connecting hole, and the connecting hole passes through the connecting portion along the length extension direction thereof, and then a locking piece can be passed through the connecting hole along the length extension direction of the connecting hole, and connected to the end plate, so as to achieve the effect of connecting the connecting portion with the end plate. In addition, such a configuration can make the contact area between the locking piece passed through along the length extension direction of the connecting hole and the inner wall of the connecting hole larger, so that the force bearing area between the locking piece and the connecting portion is larger, reducing the risk of stress concentration between the locking piece and the connecting portion, thereby improving the problem of fracture at the connecting portion of the layering strip.

[0027] The present application also provides an electrical device, comprising the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0030] Figure 2 A schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0031] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0032] Figure 4 A disassembled schematic diagram of a battery device according to some embodiments of the present application;

[0033] Figure 5 A schematic diagram of the assembly structure of a battery device according to some embodiments of the present application;

[0034] Figure 6 for Figure 5 A partial enlarged view of the middle A;

[0035] Figure 7 A schematic diagram of the structure of a pressure strip in a battery device in some embodiments of the present application;

[0036] Figure 8 This is a schematic structural diagram of an end plate in a battery device according to some embodiments of the present application.

[0037] Description of Figure Numbers:

[0038] 1000. Vehicles;

[0039] 100, battery device; 200, controller; 300, motor;

[0040] 1. Box body; 11. First part; 12. Second part;

[0041] 2. Battery cell group; 20. Battery cell; 21. End cover; 21a. Electrode terminal; 22. Shell; 23. Cell assembly; 231. Tab;

[0042] 3. end plate; 31. boss; 31a. via hole;

[0043] 4. pressure strip; 41. main body; 42. folding portion; 421. connecting portion; 421a. connecting hole;

[0044] 5. Locking parts;

[0045] 6. Threaded sleeve;

[0046] X, first direction;

[0047] Y, length extension direction.

[0048] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, 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.

[0052] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0053] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0054] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0055] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0056] Please refer to Figure 2 and Figure 3 , Figure 2An exploded diagram of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a battery cell 20. In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection to form a battery cell group 2. The mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The battery device 100 may also include a box 1, and the battery cells 20 are accommodated in the box 1. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the battery cell group composed of the multiple battery cells 20 is accommodated in the box 1; of course, the battery device 100 may also be a battery cell group 2 in which multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection, and then a limiting component is set to limit the circumferential position of the battery cell group 2 to form a battery module together with the battery cell group, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 1. Among them, the box 1 is used to provide a storage space for the battery cells 20, and the box 1 can adopt a variety of structures. In some embodiments, the box body 1 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 jointly define a storage space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, and the first portion 11 covers the open side of the second portion 12, so that the first portion 11 and the second portion 12 jointly define a storage space; the first portion 11 and the second portion 12 may also be hollow structures with one side open, and the open side of the first portion 11 covers the open side of the second portion 12. Of course, the box body 1 formed by the first portion 11 and the second portion 12 may be in various shapes, such as a cylinder, a cuboid, etc.

[0057] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0058] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0059] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery device. Figure 3 The battery cell 20 includes an end cover 21, a shell 22, a battery cell assembly 23 and other functional components.

[0060] The end cap 21 refers to a component that covers the opening of the shell 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 shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the battery cell assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0061] The shell 22 is a component used to cooperate with the end cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell assembly 23, electrolyte and other components. The shell 22 and the end cover 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cover 21 at the opening. Without limitation, the end cover 21 and the shell 22 can also be integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cover 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the battery cell assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0062] The battery cell assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more battery cell assemblies 23 may be included in the housing 22. The battery cell assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 231. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device, the positive active material and the negative active material react with the electrolyte, and the tab 231 connects the electrode terminals to form a current loop.

[0063] In some embodiments, when the battery device 100 includes a limiting assembly, the limiting assembly includes end plates arranged at both ends of the arrangement direction of the battery cells 20 and a pressure strip connecting the two end plates. However, in the related art, the pressure strip usually includes a long strip-shaped main body, the end of the main body is folded to form a sheet-like folded portion and connected to the end plate by bolts, and the length direction of the bolt is perpendicular to the direction of the folded portion. However, the battery cell group will expand during the charging or discharging process, and then the expansion force is transmitted to the bolt through the folded portion of the pressure strip, so that the bolt is subjected to radial shear force. Because the length direction of the bolt in the related art is perpendicular to the folded portion, the force area between the bolt and the pressure strip is small, and the contact position between the two is prone to stress concentration, and then the position where the pressure strip contacts the bolt and the position where the bolt contacts the pressure strip are at risk of breakage.

[0064] Please refer to Figures 2 to 7 In order to improve the problem that the pressure strip is easy to break, the present application proposes a battery device 100. The battery device 100 includes a battery cell group 2, an end plate 3, a pressure strip 4 and a locking member 5. The battery cell group 2 includes a plurality of battery cells 20 arranged along a first direction X. At least two end plates 3 are arranged opposite to each other in the first direction X, wherein the two end plates 3 are respectively arranged at the two ends of the battery cell group 2. The pressure strip 4 extends along the first direction X, and a connecting portion 421 is provided at the end of the pressure strip 4. The connecting portion 421 is provided with a long strip-shaped connecting hole 421a, and the connecting hole 421a passes through the connecting portion 421 along its length extension direction Y, and the length extension direction Y is arranged at an angle with the first direction X. The locking member 5 is passed through the connecting hole 421a along the length extension direction Y and is connected to the end plate 3.

[0065] The battery cell group 2 refers to a component formed by connecting a plurality of battery cells 20 arranged along a first direction X in series, in parallel or in mixed series. The battery cell group 2 may include two, three or more battery cells 20 .

[0066] The end plate 3 refers to a plate structure arranged at both ends of the battery cell group 2 along the first direction X, and the end plate 3 is used to limit the two 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-metallic material. There can be two end plates 3, which are respectively arranged at the 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 isolating it from the outside. The end plate 3 can be rectangular, circular or other special-shaped shapes. It should be noted that at least two end plates 3 can be arranged relatively only in the first direction X in the battery device 100; or in other examples, the battery device 100 can also include a limiter arranged in other directions at an angle to the first direction X to limit the battery cell group 2 in other directions.

[0067] The pressure 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 pressure strip 4 can be made of metal or non-metal. The pressure strip 4 extends along the first direction X, and the two ends of the pressure strip 4 are respectively connected to the two end plates 3. Taking the first direction X as the front-to-back direction as an example, the pressure strip 4 can be provided on at least one of the top, left and right sides of the battery cell group 2. There can be one pressure strip 4, which can be provided on the top, left or right side of the battery cell group 2; or there can be at least two pressure strips 4, and all pressure strips 4 are provided on the same side of the battery cell group 2, for example, all pressure strips 4 are provided on the top, left or right side of the battery cell group 2; or at least one pressure strip 4 is provided on the top, left or right side of the battery cell group 2.

[0068] The connection part 421 refers to the part of the pressure strip 4 used to connect with the end plate 3. The pressure strip 4 may only include a strip-shaped plate body, and the two opposite ends of the plate body form the connection part 421, that is, the connection part 421 may be a cylindrical body or a block structure, wherein the connection part 421 may be integrally formed with the plate body, or may be connected together by welding or the like; in this case, the connection part 421 may be connected to the end plate 3 in a perpendicular first direction X. Alternatively, the pressure strip 4 may include a straight plate body and a connecting plate or a connecting block connected to the plate body at an angle, and the connecting plate or the connecting block is provided with a connection part 421, and the connection part 421 may be a block structure or a cylindrical structure, etc.; wherein the connection part 421 may be connected to the connecting plate or the connecting block by integrally forming or welding. It should be noted that the edge of the strip-shaped plate body in the pressure strip 4 may be straight, serrated or wavy, etc.

[0069] The connecting hole 421a refers to a hole for the locking member 5 to pass through and connect the connecting portion 421 to the end plate 3 through the locking member 5, and the hole is in the shape of an elongated strip. The length extension direction Y of the connecting hole 421a can be set at an angle with the first direction X, and specifically, the length extension direction Y can be set at an acute angle, a right angle, or an obtuse angle with the first direction X. The connecting hole 421a passes through the connecting portion 421 along its length direction, and the connecting portion 421 can be a structure similar to a sleeve, a semi-cylindrical groove, a U-shaped groove, etc., wherein the cross-sectional shape of the connecting hole 421a can be circular, rectangular, or other shapes. The inner surface of the connecting hole 421a can be a smooth surface or provided with an internal thread structure.

[0070] The locking member 5 refers to a component used to lock the pressure strip 4 and the end plate 3 together. The locking member 5 can be a pin, a screw, a bolt or other locking member 5. The locking member 5 can be inserted through the connection hole 421a and extended out of the connection hole 421a and then locked on the end plate 3, or after inserting the connection hole 421a and the end plate 3, the end of the locking member 5 is bent to lock the end plate 3 and the connection part 421 between the two bent ends of the locking member 5; or after the nut locking member 5 is inserted through the connection hole 421a and the end plate 3 along the length extension direction Y of the connection hole 421a, the connection part 421 of the end plate 3 and the pressure strip 4 is locked by the nut; or after the locking member 5 is inserted through the end plate 3 and the connection hole 421a, the locking member 5 is threadedly connected with the connection hole 421a, etc. By penetrating the locking member 5 through the connecting hole 421a along the length direction of the connecting hole 421a, the contact area between the locking member 5 and the connecting portion 421 is increased, thereby increasing the force-bearing area of ​​the two, thereby reducing the risk of stress concentration and improving the problem of breakage at the connecting portion 421 of the locking member 5 and the pressure strip 4.

[0071] The technical solution of the present application arranges at least two end plates 3 relatively in the first direction X, wherein the two end plates 3 are respectively arranged at the two ends of the battery cell group 2, so that the end plates 3 can limit the battery cell group 2 formed by a plurality of battery cells 20 arranged along 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 along 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 relatively arranged in the first direction X is improved, and on the other hand, the pressure strip 4 can limit the battery cell group 2 in other directions other than the first direction X, thereby improving the stability of the battery cell group 2. In addition, by providing a connecting portion 421 at the end of the pressure strip 4, the connecting portion 421 is provided with a long strip connecting hole 421a, and the connecting hole 421a passes through the connecting portion 421 along its length extension direction Y. The locking member 5 is passed through the connecting hole 421a along the length extension direction Y and is connected to the end plate 3. The contact area between the locking member 5 and the inner wall of the connecting hole 421a is increased, thereby increasing the force-bearing area between the locking member 5 and the connecting portion 421, reducing the risk of stress concentration between the locking member 5 and the connecting portion 421, and thereby improving the problem of breakage at the connecting portion 421 between the locking member 5 and the pressure strip 4.

[0072] Please refer to Figures 4 to 7 In one embodiment of the present application, the length extension direction Y is perpendicular to the first direction X.

[0073] Specifically, taking the first direction X as the front-to-back direction as an example, the length extension direction Y may be the up-down direction or the left-to-right direction; taking the first direction X as the left-to-right direction as an example, the length extension direction Y may be the up-down direction or the front-to-back direction; of course, when taking the first direction X as the up-to-down direction as an example, the length extension direction Y may be the left-to-right direction or the front-to-back direction.

[0074] It can be understood that the size of the battery device 100 in the first direction X is usually the largest, and the size in the perpendicular direction X is smaller, and when the connection portion 421 of the pressure strip 4 is connected to the end plate 3, the connection portion 421 occupies a smaller space in the perpendicular first direction X, so there is still some redundant space in the perpendicular first direction X. By setting the length extension direction Y of the connection hole 421a perpendicular to the first direction X, the space occupied by the battery device 100 in the first direction X can be reduced, and the impact on the space originally occupied by the battery device 100 in the perpendicular first direction X is small, so such a setting can reduce the volume of the battery device 100.

[0075] Please refer to Figures 4 to 7 In one embodiment of the present application, the end of the pressure strip 4 is rolled up to form the connecting portion 421 .

[0076] The pressure strip 4 may only include a long strip-shaped plate structure. When the plate structure extends along the first direction X, the end of the plate is wound to form a connecting portion 421, that is, the connecting portion 421 is a tubular structure, and the length extension direction Y of the connecting hole 421a of the connecting portion 421 is consistent with the width direction of the pressure strip 4; at this time, if the pressure strip 4 is arranged at the top of the battery cell group 2, the connecting portion 421 can be arranged at the top of the end plate 3, and the connecting portion 421 can be locked at the top position of the end plate 3 by the locking member 5. Alternatively, the pressure strip 4 may include a long strip-shaped plate body extending along the first direction X and a flange at an angle to the plate body, the flange being the end structure of the pressure strip 4, and then the flange can be rolled up to form a connecting portion 421, at which time the connecting portion 421 is located on the side of the end plate 3 away from the battery cell group 2, and the length extension direction Y of the connecting hole 421a of the connecting portion 421 is consistent with the width direction of the pressure strip 4, and then a boss 31 can be protruded on the end plate 3 so that the locking piece 5 can be locked on the boss 31 of the end plate 3 after passing through the connecting hole 421a of the connecting portion 421.

[0077] The connecting portion 421 formed by winding the end of the pressure strip 4 can be in a cylindrical shape, a rectangular cylindrical body, a V-shaped groove body, a U-shaped groove body, or the like.

[0078] By rolling the end of the pressure strip 4 to form the connection portion 421, the connection portion 421 is integrally connected to the pressure strip 4, thereby improving the connection strength of the connection portion 421 and increasing the thickness of the end of the pressure strip 4, thereby reducing the risk of the pressure strip 4 breaking.

[0079] Please refer to Figures 4 to 7 In one embodiment of the present application, the pressure strip 4 includes a main body 41 and a folding portion 42. The main body 41 extends along the first direction X. The folding portion 42 is connected to the end of the main body 41 at an angle and is provided on a side of the end plate 3 away from the battery cell group 2. The folding portion 42 is provided on a side of the end plate 3 away from the battery cell group 2. One end of the folding portion 42 away from the main body 41 is wound to form the connecting portion 421.

[0080] The main body 41 refers to a portion used to limit the battery cell group 2 in a direction that is angled with the first direction X. Taking the first direction X as the front-to-back direction as an example, when the pressure strip 4 is provided at the top of the battery cell group 2, the main body 41 of the pressure strip 4 is a portion opposite to the top of the battery cell group 2; when the pressure strip 4 is provided at the left or right side of the battery cell group 2, the main body 41 of the pressure strip 4 is located at a portion opposite to the left or right side of the battery cell group 2. The main body 41 may be a plate-shaped body or a columnar body, etc.

[0081] The folding portion 42 refers to a portion connected to the end of the main body 41 at an angle, for example, the folding portion 42 is set at an acute angle, a right angle or an obtuse angle with the main body 41. The folding portion 42 is formed by folding the main body 41. The folding portion 42 can be arranged opposite to the end plate 3 to be connected to the end plate 3. The folding portion 42 can be a flat plate or an L-shaped plate. The connecting piece can be connected to the end plate 3 by screw connection, pin connection or other locking methods of the locking member 5. One end of the folding portion 42 is connected to the end of the main body 41, and the other end is not connected to the main body 41. The end of the folding portion 42 away from the main body 41 refers to the end of the folding portion 42 that is not connected to the main body 41. The folding portion 42 can be connected to the side of the end plate 3 facing the battery cell 20, and can also be connected to the side of the end plate 3 away from the battery cell 20. When the folded portion 42 is connected to the side of the end plate 3 facing the battery cell 20 , a slot can be provided on the side of the end plate 3 facing the battery cell 20 , and the connecting portion 421 is inserted into the slot, thereby reducing the risk of the connecting portion 421 contacting the battery cell group 2 .

[0082] By extending the main body 41 along the first direction X and connecting the folded portion 42 to the main body 41 at an angle, the battery cell group 2 can be located between the folded portions 42 at both ends of the main body 41, so that the folded portions 42 further better limit the positions of both ends of the battery cell group 2 along the first direction X, thereby improving the stability of the battery device 100. By winding the folded portion 42 away from one end of the main body 41 to form the connecting portion 421, the molding process of the connecting portion 421 is more convenient.

[0083] Please refer to Figures 4 to 6 In one embodiment of the present application, the folding portion 42 is provided on a side of the end plate 3 away from the battery cell group 2 , and one end of the folding portion 42 away from the main body portion 41 is wound in a direction away from the end plate 3 to form the connecting portion 421 .

[0084] By arranging the folding portion 42 on the side of the end plate 3 away from the battery cell group 2, the risk of the folding portion 42 contacting the battery cell group 2 can be further reduced, and the folding portion 42 can have a good limiting effect on the battery cell group 2 and the end plate 3 in the first direction X, thereby improving the stability of the end plate 3 and the battery cell group 2. By winding the end of the folding portion 42 away from the main body 41 in the direction away from the end plate 3 to form the above-mentioned connecting portion 421, the length dimension of the main body 41 of the pressure strip 4 can be reduced, thereby reducing the cost of the pressure strip 4.

[0085] Please refer to Figure 4 , Figure 5 , Figure 6 as well as Figure 8In one embodiment of the present application, the end plate 3 is provided with a boss 31 , and the boss 31 is provided at the end of the connecting portion 421 , and the locking member 5 passes through the connecting portion 421 and is connected to the boss 31 .

[0086] The boss 31 refers to a protruding portion protruding from the end plate 3 and used to connect with the locking member 5. The boss 31 may be rectangular, semicircular or shaped. The boss 31 may be provided with one, two or more. When there is one boss 31, the boss 31 may be provided at one end of the connecting portion 421 and disposed toward the connecting hole 421a. When there are two bosses 31, the two bosses 31 may be provided at opposite ends of the connecting portion 421, respectively.

[0087] When the boss 31 is provided on the end plate 3, it can be provided on the top of the end plate 3 or on the side of the end plate 3 away from the battery cell group 2. For example, when the pressure strip 4 only includes a plate body extending along the first direction X, the connection portion 421 is provided at the end of the plate body, and when the plate body is provided at the top of the battery cell group 2, the connection portion 421 can be provided at the top of the end plate 3, and the boss 31 can be provided on the top of the end plate 3; when the pressure strip 4 includes the above-mentioned folding portion 42, the boss 31 can be provided on the top of the end plate 3 or on the side of the end plate 3 away from the battery cell group 2.

[0088] By providing the boss 31 on the end plate 3, the boss 31 is provided at the end of the connection portion 421, and the locking member 5 passes through the connection portion 421 and is connected to the boss 31, it is possible to reduce the number of holes opened on the body of the end plate 3 or reduce the size of the hole opened on the end plate 3, thereby avoiding reducing the strength of the end plate 3. In addition, such a configuration also allows the length of the locking member 5 to be set shorter, thereby reducing the space occupied by the locking member 5.

[0089] Please refer to Figures 4 to 6 In one embodiment of the present application, the locking member 5 is a threaded rod, and the locking member 5 is threadedly connected to the boss 31 .

[0090] A threaded rod refers to a rod-shaped body with an external thread structure, such as a screw or a bolt.

[0091] When the locking piece 5 is threadedly connected to the boss 31, the locking piece 5 can be directly threadedly locked on the boss 31, that is, an internal thread structure is provided on the boss 31, and the locking piece 5 is threadedly connected to the internal thread structure of the boss 31; or a nut threadedly matched with the locking piece 5 can be provided on the boss 31, and the nut can be embedded in the boss 31, or it can be provided on the side of the boss 31 facing the connecting portion 421 or the side away from the connecting portion 421.

[0092] By setting the locking member 5 as a threaded rod and the locking member 5 being threadedly connected to the boss 31, it is convenient to detach the boss 31 from the connecting portion 421, thereby facilitating the replacement of the pressure strip 4 provided with the connecting portion 421. In addition, such a setting can ensure that the connection between the connecting portion 421 and the boss 31 is more stable.

[0093] like Figure 4 As shown, in one embodiment of the present application, the battery device 100 further includes a threaded sleeve 6 , which is connected to the boss 31 and is threadedly connected to the locking member 5 .

[0094] The threaded sleeve 6 refers to a sleeve body with an internal thread on the inner wall. When the threaded sleeve 6 is connected to the boss 31, the boss 31 may be provided with a through hole communicating with the connecting hole 421a, and the threaded sleeve 6 may be completely embedded in the boss 31; or, one end of the threaded sleeve 6 may be embedded in the boss 31, and the other end may be arranged outside the boss 31 and extend toward the connecting portion 421 and communicate with the connecting hole 421a; or, the boss 31 may be provided with a through hole communicating with the connecting hole 421a, and one end of the threaded sleeve 6 may be embedded in one end of the through hole away from the connecting hole 421a, and the other end may be located outside the boss 31 and extend in a direction away from the connecting portion 421.

[0095] By connecting the threaded sleeve 6 to the boss 31 and threading it with the locking member 5, it is possible to avoid directly providing an internal thread structure on the boss 31, and the locking member 5 is directly threadedly locked with the boss 31, thereby reducing the risk of damaging the strength of the boss 31.

[0096] Please refer to Figure 4 , Figure 5 , Figure 6 as well as Figure 8 In one embodiment of the present application, the boss 31 is provided with a through hole 31 a, the through hole 31 a is connected to the connecting hole 421 a, and the threaded sleeve 6 is embedded in the through hole 31 a.

[0097] The through hole 31a refers to a hole that passes through the boss 31 and faces the connecting portion 421 and away from the connecting portion 421. The through hole 31a can be a rectangular hole, a circular hole or a hole of other shapes, as long as it can be adapted to the outer contour of the threaded sleeve 6.

[0098] By connecting the through hole 31a to the connecting hole 421a and embedding the threaded sleeve 6 in the through hole 31a, the locking member 5 can be inserted into the threaded sleeve 6 after passing through the connecting hole 421a of the connecting portion 421, and can be threadedly matched with the threaded sleeve 6 to achieve the effect of connecting the boss 31 to the connecting portion 421. In addition, such an arrangement can reduce the situation where the threaded rod is too long due to passing through the end of the boss 31 away from the connecting portion 421, thereby reducing the space occupied by the threaded rod.

[0099] Please refer to Figure 4 , Figure 5 , Figure 6 as well as Figure 8 In one embodiment of the present application, at least two bosses 31 are provided at intervals along the length extension direction Y, and at least two bosses 31 are respectively provided at two opposite ends of the connecting portion 421 .

[0100] With such a configuration, the two opposite ends of the connection portion 421 are respectively limited by the two bosses 31 , thereby reducing the risk of the connection portion 421 moving in the length extension direction Y thereof, thereby ensuring that the pressure strip 4 has good stability.

[0101] Please refer to Figures 4 to 7 The present application also proposes a pressure strip 4, which is applied to the battery device 100. The specific structure of the pressure strip 4 refers to the above embodiment. Since the pressure strip 4 adopts all the technical solutions of the pressure strip 4 in all the above embodiments, it at least has all the beneficial effects brought by the pressure strip 4 in the above embodiments. Specifically, the pressure strip 4 extends along the first direction X, and the end of the pressure strip 4 is provided with a connecting portion 421, and the connecting portion 421 is provided with a long strip-shaped connecting hole 421a, and the connecting hole 421a passes through the connecting portion 421 along the length extension direction Y thereof.

[0102] The pressure strip 4 can be applied to the above-mentioned battery device 100 ; it can also be applied to other battery devices 100 .

[0103] The connection part 421 refers to the part of the pressure strip 4 used to connect with the end plate 3. The pressure strip 4 may only include a strip-shaped plate body, and the two opposite ends of the plate body form the connection part 421, that is, the connection part 421 may be a cylindrical body or a block structure, wherein the connection part 421 may be integrally formed with the plate body, or may be connected together by welding or the like; in this case, the connection part 421 may be connected to the end plate 3 in a perpendicular first direction X. Alternatively, the pressure strip 4 may include a straight plate body and a connecting plate or a connecting block connected to the plate body at an angle, and the connecting plate or the connecting block is provided with a connection part 421, and the connection part 421 may be a block structure or a cylindrical structure, etc.; wherein the connection part 421 may be connected to the connecting plate or the connecting block by integrally forming or welding. It should be noted that the edge of the strip-shaped plate body in the pressure strip 4 may be straight, serrated or wavy, etc.

[0104] The connection hole 421a is a hole for the locking member 5 to pass through and connect the connection part 421 to the end plate 3, and the hole is in the shape of an elongated strip. The length extension direction Y of the connection hole 421a can be arranged parallel to the first direction X, or can be arranged at an angle to the first direction X. The connection hole 421a passes through the connection part 421 along its length direction, and the connection part 421 can be a structure similar to a sleeve, a semi-cylindrical groove, a U-shaped groove, etc., wherein the cross-sectional shape of the connection hole 421a can be circular, rectangular or other shapes. The inner surface of the connection hole 421a can be a smooth surface or provided with an internal thread structure.

[0105] The first direction X may be a front-to-back direction, a left-to-right direction, or an up-to-down direction. The length extension direction Y may be consistent with the first direction X, or may be arranged at an angle to the first direction X.

[0106] By providing a connecting portion 421 at the end of the pressure strip 4, the connecting portion 421 is provided with a long strip connecting hole 421a, and the connecting hole 421a passes through the connecting portion 421 along its length extension direction Y, then the locking member 5 can be passed through the connecting hole 421a along the length extension direction Y of the connecting hole 421a and connected to the end plate 3, so as to achieve the effect of connecting the connecting portion 421 with the end plate 3. In addition, such a configuration can make the contact area between the locking member 5 passed through along the length extension direction Y of the connecting hole 421a and the inner wall of the connecting hole 421a larger, so that the force bearing area of ​​the locking member 5 and the connecting portion 421 is larger, reducing the risk of stress concentration between the locking member 5 and the connecting portion 421, thereby improving the problem of fracture at the connecting portion 421 of the pressure strip 4.

[0107] The present application also proposes an electric device. The electric device includes a battery device 100. The specific structure of the battery device 100 refers to the above embodiments. Since the electric device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Specifically, the electric device can be any of the above-mentioned devices or systems using the battery device 100.

[0108] The above are only exemplary embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell group, wherein the battery cell group includes 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; and A pressure strip, the pressure strip extends along the first direction, a connecting portion is provided at an end of the pressure strip, the connecting portion is provided with a long strip-shaped connecting hole, the connecting hole passes through the connecting portion along a length extension direction thereof, and the length extension direction is arranged at an angle with the first direction; A locking piece is passed through the connecting hole along the length extension direction and connected to the end plate.

2. The battery device according to claim 1, characterized in that The end of the pressure strip is rolled up to form the connecting portion.

3. The battery device according to claim 1, characterized in that: The layering strip comprises: a main body portion extending along the first direction; and A folding portion, wherein the folding portion is connected to the end of the main body portion at an angle, and one end of the folding portion away from the main body portion is rolled to form the connecting portion.

4. The battery device according to claim 3, characterized in that: The folded portion is disposed on a side of the end plate away from the battery cell group, and one end of the folded portion away from the main body is wound in a direction away from the end plate to form the connecting portion.

5. The battery device according to any one of claims 1 to 4, characterized in that: The length extension direction is perpendicular to the first direction.

6. The battery device according to any one of claims 1 to 4, characterized in that: The end plate is provided with a boss, and the boss is arranged at the end of the connecting portion. The locking member passes through the connecting portion and is connected to the boss.

7. The battery device according to claim 6, characterized in that: The locking piece is a threaded rod, and the locking piece is threadedly connected to the boss.

8. The battery device according to claim 7, characterized in that: The battery device further comprises a threaded sleeve, which is connected to the boss and is threadedly connected to the locking member.

9. The battery device according to claim 8, characterized in that: The boss is provided with a through hole, the through hole is connected to the connecting hole, and the threaded sleeve is embedded in the through hole.

10. The battery device according to claim 6, characterized in that: At least two bosses are arranged at intervals along the length extension direction, and at least two bosses are respectively arranged at two opposite ends of the connecting portion.

11. A layering strip, characterized in that: Applied to a battery device, the pressure strip extends along a first direction, a connecting portion is provided at the end of the pressure strip, the connecting portion is provided with an elongated connecting hole, the connecting hole passes through the connecting portion along its length extension direction, and the length extension direction is arranged at an angle with the first direction.

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

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