End cover assembly, battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides an end cap assembly, battery monomer, battery and electric device, battery monomer includes shell and end cap assembly, shell is equipped with the accommodation cavity, the accommodation cavity is open along first direction one side, end cap assembly includes cover plate suite and top support, cover plate suite cover is provided in the open position of accommodation cavity, the cover plate suite is equipped with functional area, and the top support is equipped with the functional area. The functional area comprises at least one of a liquid injection hole and an anti-explosion valve triggering area, and a symmetry axis is formed at the intersection position of a first center face, in the second direction, of the cover plate suite and a second center face, in the third direction, of the cover plate suite; the top support is arranged in the containing cavity and connected with the cover plate suite, through holes are formed in the top support, one part of the through holes and the other part of the through holes are in central symmetry about the symmetry axis, at least one through hole is communicated with the functional area, and / or one through hole communicated with the functional area is in central symmetry about the symmetry axis. According to the embodiment of the utility model, the probability of assembly errors between the cover plate suite and the top bracket can be reduced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of batteries, and in particular to an end cover assembly, a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, the new energy industry has developed vigorously, and batteries are an indispensable part of the new energy industry.

[0003] As the demand for batteries increases, the production capacity of batteries is also increasing. The speed of the battery production and assembly process directly affects the production capacity of batteries.

[0004] The battery includes a battery cell. The top bracket in the battery cell is arranged between the cover plate kit and the electrode assembly to insulate and support the two.

[0005] In order to adapt to the positions of functional structures such as explosion-proof valves and liquid injection holes arranged on the cover plate kit, features for adapting to the above-mentioned functional structures are also provided on the top bracket, so that the functional structures on the cover plate kit can function normally after the cover plate kit is connected to the top bracket.

[0006] During the assembly process of the cover plate kit and the top bracket, if the relative matching relationship between the two does not meet the design requirements, they need to be disassembled and reassembled, resulting in a decrease in the production and assembly speed and the risk of damage to related materials, which will have an adverse impact on the production efficiency and product quality of the battery cells. Utility Model Content

[0007] In view of this, the embodiments of the present invention are intended to provide an end cover assembly, a battery cell, a battery and an electrical device that are helpful in reducing the occurrence of assembly errors.

[0008] To achieve the above purpose, the technical solution of the embodiment of the utility model is implemented as follows:

[0009] The present invention provides a battery cell, which includes:

[0010] A housing is provided with a receiving cavity, wherein one side of the receiving cavity is open along a first direction;

[0011] An end cover assembly, comprising a cover plate set and a top bracket, wherein the cover plate set is arranged at the open position of the accommodating cavity, the cover plate set is provided with a functional area, the functional area includes at least one of a liquid injection hole and an explosion-proof valve triggering area, and the intersection position of a first central plane of the cover plate set along a second direction and a second central plane of the cover plate set along a third direction forms a symmetry axis; the top bracket is arranged in the accommodating cavity and connected to the cover plate set, the first direction, the second direction and the third direction are perpendicular to each other, and the top bracket is provided with a plurality of through holes;

[0012] A portion of the through holes is centrally symmetrical with another portion of the through holes about the symmetry axis, wherein at least one of the through holes is connected to the functional area, and / or a through hole connected to the functional area is centrally symmetrical about the symmetry axis.

[0013] In the embodiment of the utility model, during the assembly process of the cover plate kit and the top bracket, there are at least two different relative positions between the top bracket and the cover plate kit, which can enable the functional area and the through hole to cooperate with each other, thereby playing a certain anti-mistake effect in the assembly process of the cover plate kit and the top bracket, which is beneficial to reducing the probability of assembly errors between the cover plate kit and the top bracket, and is beneficial to improving the production assembly efficiency of the top bracket and the cover plate kit, and is beneficial to reducing the manufacturing cost of the battery cell.

[0014] In some embodiments, the functional area includes the injection hole, the through hole includes the flow hole, the top bracket includes two first spacers, the two first spacers are centrally symmetrical about the symmetry axis, the first spacers and the cover plate set are spaced along the first direction, the flow hole is located on the first spacer, and on the projection plane perpendicular to the first direction, the projection of the injection hole is located within the projection range of the first spacer and outside the projection range of the flow hole. In this way, the probability of the electrolyte flowing out of the injection hole and passing through the space formed between the first spacer and the cover plate set to directly enter the flow hole is reduced, which is conducive to reducing the impact force of the electrolyte after flowing out of the flow hole.

[0015] In some embodiments, the first spacer is provided with a plurality of the flow holes and divided into two groups, the two groups of flow holes are arranged at intervals, and on a projection plane perpendicular to the first direction, the projection of the injection hole is located between the projections of the two groups of flow holes. In this way, it is beneficial to realize the diversion of the flow direction of the electrolyte, so that the electrolyte flows out of the flow holes faster, and reduces the retention of the electrolyte in the space formed between the first spacer and the cover plate set.

[0016] In some embodiments, the two first spacers are symmetrical about the first center plane, and the two groups of flow holes in each first spacer are symmetrical about the second center plane. This is beneficial for uniformly manufacturing the first spacers and the flow holes during the manufacturing process of the top bracket, which is beneficial for simplifying the structure of the top bracket and improving production efficiency.

[0017] In some embodiments, the functional area includes the explosion-proof valve triggering area, the through hole includes a first exhaust hole, the number of the first exhaust holes is multiple, at least part of the first exhaust holes is connected to the explosion-proof valve triggering area, and the first exhaust holes of this part are centrally symmetrical with another part of the first exhaust holes about the symmetry axis. In this way, the top bracket can be rotated along the symmetry axis to at least two positions so that at least part of the first exhaust holes can be connected to the explosion-proof valve triggering area, which is conducive to improving the probability of assembling the top bracket and the cover plate kit to the position where the first exhaust holes are connected to the explosion-proof valve triggering area at one time, which is conducive to improving assembly efficiency and reducing the probability of assembly errors.

[0018] In some embodiments, the first exhaust holes are divided into at least two groups, and the two groups of the first exhaust holes are plane-symmetrical about the first center plane;

[0019] Alternatively, the two groups of the first exhaust holes are plane-symmetrical about the second central plane. This is helpful to simplify the manufacturing process of the two groups of the first exhaust holes, improve production efficiency, and reduce production costs.

[0020] In some embodiments, the first exhaust holes are divided into at least four groups, two groups of the first exhaust holes are plane-symmetrical with the other two groups of the first exhaust holes about the first center plane, and two groups of the first exhaust holes located on the same side of the first center plane along the second direction are plane-symmetrical with respect to the second center plane. In this way, the size, shape, position relative to the first center plane, and position relative to the second center plane of the first exhaust holes in each group are consistent, which is further conducive to simplifying the manufacturing process of the first exhaust holes, improving production efficiency, and reducing production costs.

[0021] In some embodiments, on a projection plane perpendicular to the first direction, the projection of each of the first exhaust holes is within the projection range of the explosion-proof valve triggering area. In this way, on the one hand, it is helpful to shorten the distance between the first exhaust holes and the explosion-proof valve triggering area, so that the fluid medium flowing out of the first exhaust holes can reach the explosion-proof valve faster, which is helpful to shorten the response time of the explosion-proof valve opening and improve safety; on the other hand, it is helpful to make the top bracket have at least two positions so that all the first exhaust holes can be connected to the explosion-proof valve triggering area, which improves the utilization rate of the first exhaust holes and makes it helpful to make the top bracket in different positions relative to the cover plate kit, so that the flow rate of the fluid medium passing through the first exhaust holes can meet the safety release requirements.

[0022] In some embodiments, the functional area includes the explosion-proof valve triggering area, the through hole includes a second exhaust hole, the second exhaust hole is a symmetrical structure, and forms central symmetry about the symmetry axis, and on the projection plane perpendicular to the first direction, at least part of the projection of the second exhaust hole is located within the projection range of the explosion-proof valve triggering area. In this way, the top bracket has at least two positions that enable all the second exhaust holes to communicate with the explosion-proof valve triggering area, which is conducive to reducing the probability that the fluid medium cannot enter the explosion-proof valve from the second exhaust hole due to assembly errors between the top bracket and the cover plate kit.

[0023] In some embodiments, the top bracket is provided with a plurality of first connecting parts, and the cover plate kit is provided with a plurality of second connecting parts, the first connecting parts cooperate with the second connecting parts to connect the top bracket and the cover plate kit, and a part of the first connecting parts and another part of the first connecting parts form central symmetry about the symmetry axis;

[0024] And / or, a part of the second connection part and another part of the second connection part form central symmetry about the symmetry axis. In this way, there are at least two relative positions between the cover plate kit and the top bracket to achieve the connection and cooperation between the first connection part and the second connection part, which is conducive to reducing the probability of the cover plate kit and the top bracket failing to connect due to position error, which is conducive to improving the production and assembly efficiency of the top bracket and the cover plate kit, and is conducive to reducing the manufacturing cost of the battery cell.

[0025] In some embodiments, at least two of the first connecting portions are plane-symmetrical about the first center plane;

[0026] And / or, at least two of the first connection parts are plane-symmetrical about the second center plane. In this way, it is beneficial to unify the structure and position of the first connection parts, simplify the manufacturing process, and reduce the production cost.

[0027] In some embodiments, at least two of the second connecting portions are plane-symmetrical about the first center plane;

[0028] And / or, at least two of the second connection parts are plane-symmetrical about the second center plane. In this way, it is beneficial to unify the structure and position of the second connection parts, simplify the manufacturing process, and reduce the production cost.

[0029] In some embodiments, the top bracket is provided with at least two mounting surfaces on a side surface facing away from the cover plate kit along the first direction, and one mounting surface is centrally symmetrical with the other mounting surface about the symmetry axis. In this way, the top bracket is advantageously provided with at least two placement positions to facilitate operators and equipment to take the mounting surface, and the probability of the top bracket being unable to be taken through the mounting surface due to excessive positional deviation of operators and equipment relative to the mounting surface during the process of moving the top bracket is reduced.

[0030] In some embodiments, the two mounting surfaces are symmetrical about the first center plane, and the mounting surfaces are symmetrical structures and symmetrical about the second center plane. This helps to unify the shapes, sizes and positions of the two mounting surfaces, reduce the difficulty of design and manufacturing, and help reduce production costs.

[0031] In some embodiments, the top bracket is a symmetrical structure and is centrally symmetrical about the symmetry axis, which is beneficial to improving the flexibility of the top bracket and other components in the battery cell, improving installation efficiency, and reducing production costs.

[0032] In some embodiments, the top bracket is plane-symmetrical about the first center plane and plane-symmetrical about the second center plane. This is beneficial to further improve the flexibility of the top bracket and other components in the battery cell, simplify the top bracket design and manufacturing difficulty, and reduce production costs.

[0033] The present invention also provides an end cap assembly, the end cap assembly comprising:

[0034] A cover plate kit is provided with a functional area, the functional area includes at least one of a liquid injection hole and an explosion-proof valve triggering area, and an intersection position of a first central plane of the cover plate kit along the second direction and a second central plane of the cover plate kit along the third direction forms a symmetry axis;

[0035] A top bracket, disposed on one side of the cover plate kit along a first direction and connected to the cover plate kit, the first direction, the second direction and the third direction are perpendicular to each other, and the top bracket is provided with at least one through hole;

[0036] A portion of the through holes is centrally symmetrical with another portion of the through holes about the symmetry axis, wherein at least one of the through holes is connected to the functional area, and / or a through hole connected to the functional area is centrally symmetrical about the symmetry axis.

[0037] In this way, there are at least two different relative positions between the top bracket and the cover plate kit, which can enable the functional area and the through hole to cooperate with each other, thereby playing a certain anti-mistake effect in the assembly process of the cover plate kit and the top bracket, which is beneficial to reduce the probability of assembly errors between the cover plate kit and the top bracket, and is beneficial to improving the production and assembly efficiency of the top bracket and the cover plate kit.

[0038] In some embodiments, the top bracket is provided with a plurality of first connecting parts, and the cover plate kit is provided with a plurality of second connecting parts, the first connecting parts cooperate with the second connecting parts to connect the top bracket and the cover plate kit, and a part of the first connecting parts and another part of the first connecting parts form central symmetry about the symmetry axis;

[0039] And / or, a portion of the second connection portion and another portion of the second connection portion form central symmetry about the symmetry axis.

[0040] In this way, there are at least two relative positions between the cover plate kit and the top bracket that can realize the connection and cooperation between the first connecting part and the second connecting part, which is beneficial to reduce the probability of the cover plate kit and the top bracket failing to connect due to position error, and is beneficial to improving the production and assembly efficiency of the top bracket and the cover plate kit.

[0041] In some embodiments, the top bracket is provided with at least two mounting surfaces on a side surface facing away from the cover plate kit along the first direction, and one mounting surface is centrally symmetrical with the other mounting surface about the symmetry axis. In this way, the top bracket is advantageously provided with at least two placement positions to facilitate operators and equipment to take the mounting surface, and the probability of the top bracket being unable to be taken through the mounting surface due to excessive positional deviation of operators and equipment relative to the mounting surface during the process of moving the top bracket is reduced.

[0042] The present utility model also provides a battery, which includes a box and the battery cell in the above embodiment, wherein the box is provided with an installation space, and the battery cell is arranged in the installation space. Thus, by adopting the battery cell in the above embodiment, it is beneficial to improve the overall production and assembly efficiency of the battery and reduce the risk of assembly errors.

[0043] In some embodiments, the first direction is the direction of gravity, the battery cell also includes an electrode assembly, the accommodating cavity is open on the bottom side along the first direction, the electrode assembly is located in the accommodating cavity, and the top bracket is located between the cover plate kit and the electrode assembly to support the electrode assembly.

[0044] In this way, the support of the electrode assembly by the top bracket can, on the one hand, reduce the probability of short circuit caused by contact between the electrode assembly and the cover plate kit; on the other hand, the top bracket can play a shielding role, reducing the probability of foreign matter remaining in the electrode assembly falling onto the cover plate kit under the action of gravity and causing short circuit.

[0045] The utility model also provides an electric device, which includes the battery in the above embodiment, and the battery is used as a power source for the electric device. Thus, by using the battery in the above embodiment, it is helpful to improve the overall production and assembly efficiency of the electric device and reduce the risk of assembly errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of an electric device in an embodiment of the present utility model is a vehicle;

[0047] Figure 2 is a schematic diagram of a battery in an embodiment of the present utility model;

[0048] Figure 3 It is a schematic diagram of an end cover assembly in one embodiment of the utility model at a first viewing angle;

[0049] Figure 4 for Figure 3 A schematic diagram of the embodiment in the second viewing angle;

[0050] Figure 5 for Figure 3 A schematic diagram of the embodiment in the third viewing angle;

[0051] Figure 6 This is an exploded view of an end cover assembly in one embodiment of the utility model;

[0052] Figure 7 This is a schematic diagram of a cover plate kit in one embodiment of the utility model;

[0053] Figure 8 It is a schematic diagram of a top bracket in an embodiment of the utility model at a fourth viewing angle;

[0054] Fig. 9 It is a schematic diagram of a top bracket in an embodiment of the utility model at a fifth viewing angle;

[0055] Fig.10 It is a schematic diagram of a top bracket in an embodiment of the utility model at a sixth viewing angle;

[0056] Fig.11 It is a schematic diagram of an explosion of a battery cell in one embodiment of the utility model.

[0057] Description of Reference Numerals

[0058] 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, end cover assembly; 11, cover plate kit; 11a, functional area; 11b, injection hole; 11c, explosion-proof valve trigger area; 11d, first center plane; 11e, second center plane; 11f, symmetry axis; 111, second connecting part; 12, top bracket; 12a, through hole; 12b, flow hole; 12c, first exhaust hole; 12d, second exhaust hole; 121, first spacer; 122, second spacer; 123, first connecting part; 124, mounting surface; 13, explosion-proof valve; 20, shell; 20a, accommodating chamber; 30, electrode assembly; 40, box; 41, top cover; 42, bottom cover; 50, battery cell. DETAILED DESCRIPTION

[0059] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present invention and should not be regarded as an improper limitation on the present invention.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification of the present invention and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present utility model, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the embodiments of the present utility model, for the convenience of explanation, as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the direction of the arrow X is the straight line direction of the "first direction" and the "gravity direction", the direction of x1 represents the "top", and the direction of x2 represents the "bottom"; Figure 3 and Figure 4 As shown in FIG. 1 , the direction of arrow Y is the “second direction”; Figure 3 and Figure 5 As shown, the direction of arrow Z is referred to as the “third direction”.

[0065] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0066] In the description of the embodiments of the present utility model, unless otherwise clearly stipulated and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0067] At present, batteries are increasingly used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0068] Figure 2 The following is a schematic diagram of a three-dimensional exploded view of a battery 100 provided in an embodiment of the present utility model. Figure 2 As shown, the battery 100 includes a case 40 and at least one battery cell 50 .

[0069] The box body 40 includes a top cover 41 and a bottom cover 42 . The top cover 41 is covered on the bottom cover 42 , so that an installation space for placing the battery cell 50 is formed between the bottom cover 42 and the top cover 41 .

[0070] In the battery 100, there can be multiple battery cells 50, and the multiple battery cells 50 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 50 are both connected in series and in parallel. The multiple battery cells 50 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 50 is placed in the accommodation space formed by the bottom cover 42 and the top cover 41; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 50 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the bottom cover 42 and the top cover 41. The battery 100 may also include other structures. For example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 50.

[0071] The battery cell 50 involved in the embodiment of the utility model includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 50 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, and the current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, and the current collector not coated with the negative electrode active material layer is stacked as a negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure.

[0072] The battery cell 50 may be a secondary battery. A secondary battery refers to a battery cell 50 that can be continuously used by activating active materials by charging after the battery cell 50 is discharged.

[0073] The battery cell 50 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the utility model.

[0074] The battery cell 50 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. The embodiment of the utility model has no special limitation.

[0075] The battery 100 involved in the embodiment of the present invention refers to a single physical module including one or more battery cells 50 to provide higher voltage and capacity.

[0076] The electric device involved in the embodiment of the utility model is provided with electric energy by the above-mentioned battery, and the electric device can 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 can 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 can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0077] In the following embodiments, for the convenience of description, the electric device of one embodiment of the utility model is taken as a vehicle 1000 as an example for description.

[0078] Figure 1 The structure diagram of a vehicle 1000 provided in one embodiment of the utility model is shown in FIG. 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. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can 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 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0079] In some embodiments of the present invention, the battery 100 can be used not only as an operating power source for the vehicle 1000, but also 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.

[0080] Below, the embodiments of the present utility model are described in detail.

[0081] The end cap assembly includes a cover plate set and a top bracket. The cover plate set is used to seal the open opening of the shell of the battery cell, so that the cover plate set and the shell are together formed to form a space for placing the electrode assembly and the electrolyte. Since the cover plate set is generally made of the same metal material as the shell, the cover plate set is separated from the electrode assembly by the top bracket. On the one hand, the probability of short circuit between the electrode assembly and the cover plate set due to electrical conduction is reduced. On the other hand, the top bracket and the shell jointly realize the limiting effect on the electrode assembly, so that the position of the electrode assembly remains stable, so that the electrode assembly can maintain an electrically conductive state with components such as poles arranged on the cover plate set.

[0082] Before the step of sealing and connecting the cover plate kit to the shell, in order to facilitate the electrical connection between the electrode assembly and components such as poles on the cover plate kit, it is necessary to first assemble the cover plate kit, the top bracket and the electrode assembly into an assembly before installing the electrode assembly into the shell.

[0083] In the related art, during the assembly and combination of the cover plate kit and the top bracket, since the cover plate kit is provided with parts with specific functions such as the injection hole and the explosion-proof valve triggering area, in order to ensure that the matching position of the top bracket and the cover plate kit will not adversely affect the functions of these parts, the top bracket needs to be pre-adjusted to a specific position and a specific relative angle relative to the cover plate kit before the two are assembled. In order to adjust the top bracket and the cover plate kit to the correct relative position, the assembly efficiency of the top bracket and the cover plate kit is reduced; and if the relative position of the two is incorrect due to assembly errors, the assembled end cap assembly cannot function normally, and the two need to be disassembled or scrapped again. The former is likely to cause damage to both and reduce production efficiency, while the latter will increase manufacturing costs.

[0084] Based on the above technical problems, an embodiment of the utility model aims to provide a battery cell, by making the through hole on the top bracket centrally symmetrical with respect to the axis of symmetry on the cover plate kit, so that the functional area on the cover plate kit and the through hole can be correctly matched with each other at two positions when the top bracket is rotated 180° about the axis of symmetry, thereby reducing the probability of assembly errors between the cover plate kit and the top bracket.

[0085] Specifically, see Figures 3 to 6 as well as Fig.11 The utility model provides a battery cell 50 , and the battery cell 50 includes a shell 20 and an end cover assembly 10 .

[0086] The housing 20 is provided with a receiving chamber 20a, and one side of the receiving chamber 20a is open along the first direction;

[0087] The end cover assembly 10 includes a cover plate set 11 and a top bracket 12. The cover plate set 11 is set to cover the open position of the accommodating chamber 20a. The cover plate set 11 is provided with a functional area 11a. The functional area 11a includes at least one of a liquid injection hole 11b and an explosion-proof valve triggering area 11c. The intersection of a first central plane 11d of the cover plate set 11 along the second direction and a second central plane 11e of the cover plate set 11 along the third direction forms a symmetry axis 11f.

[0088] The top bracket 12 is disposed in the accommodating cavity 20a and connected to the cover plate set 11. The first direction, the second direction and the third direction are perpendicular to each other. The top bracket 12 is provided with a plurality of through holes 12a.

[0089] One part of the through holes 12a is centrally symmetrical with another part of the through holes 12a about the symmetry axis 11f, wherein at least one through hole 12a is connected to the functional area 11a, and / or a through hole 12a connected to the functional area 11a is centrally symmetrical about the symmetry axis 11f.

[0090] The accommodating cavity 20 a provides an installation location and protection for other components in the battery cell 50 .

[0091] The cover plate assembly 11 covers the opening in the accommodating cavity 20 a so as to form a sealed environment in the accommodating cavity 20 a , thereby reducing the probability of the electrolyte and other components in the accommodating cavity 20 a being separated from the battery cell 50 .

[0092] The specific form of the cover kit 11 is not limited. For example, the cover kit 11 includes a cover body and a lower plastic part, which are stacked along a first direction to form the cover kit 11. The top bracket 12 is located on the side of the lower plastic part away from the cover body along the first direction, and an explosion-proof valve 13 and a pole are provided on the cover body.

[0093] The injection hole 11 b is used to inject electrolyte into the battery cell 50 through the injection hole 11 b after the end cover assembly 10 and the housing 20 are sealed and matched, so that the battery cell 50 can be subsequently formed.

[0094] The explosion-proof valve triggering area 11c refers to an area where the explosion-proof valve 13 can be triggered to open by air pressure changes. The explosion-proof valve triggering area 11c can be a part of the explosion-proof valve 13; it can also be a part of other parts in the end cover assembly 10 to indirectly trigger the explosion-proof valve 13 to open.

[0095] See also Figure 4 , Figure 5 and Figure 7 The first center plane 11d refers to the plane passing through the center position of the cover plate kit 11 along the second direction and perpendicular to the second direction; the second center plane 11e refers to the plane passing through the center position of the cover plate kit 11 along the third direction and perpendicular to the third direction.

[0096] It should be noted that the first center plane 11d and the second center plane 11e are both virtual reference planes.

[0097] The symmetry axis 11f is a straight line formed by the intersection of the first center plane 11d and the second center plane 11e.

[0098] The specific orientation of the first direction is not limited. For example, the first direction is the thickness direction of the cover plate set 11 .

[0099] The functional area 11a is used to communicate with the through hole 12a. The functional area 11a and the through hole 12a are in communication, so that the fluid medium can pass through the functional area 11a and the through hole 12a.

[0100] The fluid medium passing through the functional area 11a and the through hole 12a is not limited. For example, the electrolyte can enter the battery cell 50 through the functional area 11a and the through hole 12a; for another example, the high-temperature and high-pressure gas generated by the battery cell 50 running out of control can enter the functional area 11a through the through hole 12a.

[0101] It should be noted that the functional area 11a is used to communicate with the through hole 12a, which means that each functional area 11a needs to be connected with the through hole 12a; and the through hole 12a can be fully connected with the functional area 11a, or partially connected with the functional area 11a while the other part is not connected with the functional area 11a.

[0102] It can be understood that the symmetry axis 11f extends along the first direction.

[0103] The through hole 12a and the other through hole 12a are centrally symmetrical about the symmetry axis 11f. That is, after the two through holes 12a are rotated 180° about the symmetry axis 11f, the positions and shapes of the through holes 12a and the other through holes 12a before the rotation are completely overlapped.

[0104] At least a portion of the through holes 12a are connected to the functional area 11a, that is, both portions of the through holes 12a are connected to the functional area 11a before and after rotating 180° with the symmetry axis 11f as the rotation axis; or a portion is connected to the functional area 11a, while the other portion is not connected to the functional area 11a. After rotating 180° with the symmetry axis 11f as the rotation axis, a portion of the through holes 12a that were previously connected to the functional area 11a are no longer connected to the functional area 11a, while a portion of the through holes 12a that were previously not connected to the functional area 11a are connected to the functional area 11a.

[0105] A through hole 12a connected to the functional area 11a is centrally symmetrical about the symmetry axis 11f. That is, the through hole 12a itself is a symmetrical structure, and it can be connected to the functional area 11a before and after rotating 180° around the symmetry axis 11f, and the position and shape before the rotation are completely coincident with the position and shape after the rotation.

[0106] It can be understood that the symmetry axis 11f passes through the geometric center of the through hole 12a having a symmetrical structure.

[0107] In the embodiment of the utility model, during the assembly process of the cover plate kit 11 and the top bracket 12, there are at least two different relative positions between the top bracket 12 and the cover plate kit 11, which can enable the functional area 11a to cooperate with the through hole 12a, thereby playing a certain anti-mistake effect in the assembly process of the cover plate kit 11 and the top bracket 12, which is beneficial to reducing the probability of assembly errors between the cover plate kit 11 and the top bracket 12, and is beneficial to improving the production assembly efficiency of the top bracket 12 and the cover plate kit 11, and is beneficial to reducing the manufacturing cost of the battery cell 50.

[0108] It is understandable that the top bracket 12 is made of insulating material, such as plastic.

[0109] In some embodiments, see Fig.11 The battery cell 50 further includes an electrode assembly 30 , which is located in the accommodating cavity 20 a , and the top bracket 12 is located between the electrode assembly 30 and the cover plate kit 11 .

[0110] The electrode assembly 30 can undergo an electrochemical reaction with the electrolyte in the accommodation cavity 20 a to achieve the charging and discharging functions of the battery cell 50 .

[0111] The top bracket 12 separates the cover plate kit 11 from the electrode assembly 30 to reduce the risk of electrical conduction and short circuit caused by contact between the two; at the same time, the top bracket 12 plays a shielding role to reduce the risk of impurities such as carbon powder remaining in the electrode assembly 30 falling onto the cover plate kit 11 and causing a short circuit.

[0112] In some embodiments, the second direction is the length direction of the cover plate set 11 , and the third direction is the width direction of the cover plate set 11 .

[0113] The length direction of the cover plate assembly 11 refers to the straight line direction where the largest dimension of the three-dimensional dimensions of the cover plate assembly 11 is located.

[0114] The width direction of the cover plate assembly 11 refers to a straight line direction perpendicular to the first direction and the length direction of the cover plate assembly 11 in the three-dimensional dimensions of the cover plate assembly 11 .

[0115] In some embodiments, see Figure 7In the projection perpendicular to the first direction, the projection of the cover plate kit 11 is rectangular, so it is convenient to determine the installation position of the top bracket 12 according to the length direction of the cover plate kit 11 and the width direction of the cover plate kit 11.

[0116] In some embodiments, the length direction of the top bracket 12 is the same as the length direction of the cover plate set 11, and the width direction of the top bracket 12 is the same as the width direction of the cover plate set 11. In this way, it is further convenient to determine the relative installation position of the top bracket 12 and the cover plate set 11, and it is also convenient for the top bracket 12 to rotate to a suitable position relative to the symmetry axis 11f to adapt to the cover plate set 11.

[0117] It can be understood that the specific arrangement of the through holes 12 a needs to be adapted to the specific functions of the functional area 11 a .

[0118] In some embodiments, see Figure 7 and Figure 8 The functional area 11a includes a liquid injection hole 11b, the through hole 12a includes a flow hole 12b, the top bracket 12 includes two first spacers 121, and the two first spacers 121 form a central symmetry about the symmetry axis 11f. The first spacers 121 and the cover plate kit 11 are spaced apart along the first direction, and the flow hole 12b is located on the first spacers 121. On the projection plane perpendicular to the first direction, the projection of the liquid injection hole 11b is located within the projection range of the first spacers 121 and outside the projection range of the flow hole 12b.

[0119] When injecting electrolyte into the battery cell 50 through the injection hole 11b, the electrolyte enters the space formed between the first partition 121 and the cover plate assembly 11 through the injection hole 11b, and then enters the flow hole 12b from the space to flow into the battery cell 50.

[0120] It can be understood that the electrolyte has a certain pressure during the process of being injected into the injection hole 11b. Therefore, on the projection plane perpendicular to the first direction, the projection of the flow hole 12b does not overlap with the projection of the injection hole 11b, so that the electrolyte flowing out of the injection hole 11b will first impact the first spacer 121, and then flow on the first spacer 121 to the flow hole 12b. In this way, the probability of the electrolyte flowing out of the injection hole 11b and passing through the space formed by the first spacer 121 and the cover plate kit 11 and directly entering the flow hole is reduced, which is beneficial to reduce the impact force of the electrolyte after flowing out of the flow hole.

[0121] The two first spacers 121 are symmetrical with each other about the center of the symmetry axis 11f, so that the top bracket 12 can be rotated along the symmetry axis 11f to at least two positions to enable the first spacer 121 to correspond to the injection hole 11b, which is beneficial to improve the probability of assembling the top bracket 12 and the cover plate kit 11 to the position where the liquid hole and the injection hole 11b are connected at one time, which is beneficial to improve assembly efficiency and reduce the probability of assembly errors.

[0122] The specific number of the injection holes 11b is not limited. Figure 7 The number of the injection hole 11b is one and the axis of symmetry 11f is located outside the range of the injection hole 11b. That is to say, when the top bracket 12 and the cover plate kit 11 are correctly assembled, the injection hole 11b is only connected to the space formed between the same first spacer 121 and the cover plate kit 11, while the space formed between the other first spacer 121 and the cover plate kit 11 is not connected to the injection hole 11b.

[0123] In some embodiments, see Figures 8 to 10 The first spacer 121 is provided with a plurality of flow holes 12b which are divided into two groups. The two groups of flow holes 12b are arranged at intervals. On the projection plane perpendicular to the first direction, the projection of the injection hole 11b is located between the projections of the two groups of flow holes 12b.

[0124] That is to say, after the electrolyte flows into the space formed between the first spacer 121 and the cover plate set 11 through the flow holes 12b, it can simultaneously flow into the two groups of flow holes 12b arranged opposite to each other under the guidance of the first spacer 121.

[0125] This is beneficial for diverting the flow direction of the electrolyte, so that the electrolyte flows out of the flow hole 12 b more quickly, and reduces the retention of electrolyte in the space formed between the first spacer 121 and the cover plate kit 11 .

[0126] In some embodiments, the two groups of flow holes 12b are spaced apart along a third direction, which helps to reduce the distance between the flow holes 12b and the shell 20, and helps the electrolyte flowing out of the flow holes 12b flow down along the inner wall of the shell 20, thereby reducing the scouring of the electrode assembly 30 installed in the shell 20 by the electrolyte.

[0127] The specific number of each group of flow holes 12b is not limited, and can be one or more.

[0128] In some embodiments, see Fig.10 The two first spacers 121 are plane-symmetrical about the first center plane 11d, and the two groups of flow holes 12b in each first spacer 121 are plane-symmetrical about the second center plane 11e.

[0129] That is, the two first spacers 121 have the same shape and size and are at the same distance from the first center plane 11d; and the flow holes 12b symmetrical about the second center plane 11e have the same shape and size and are at the same distance from the second center plane 11e.

[0130] In this way, it is beneficial to uniformly manufacture the first spacer 121 and each flow hole 12b during the process of manufacturing the top bracket 12, which is beneficial to simplify the structure of the top bracket 12 and improve production efficiency.

[0131] It can be understood that the flow holes 12 b on the two first spacing portions 121 are plane-symmetrical with respect to the first center plane 11 d .

[0132] In some embodiments, see Figure 3 , Figure 6 and Figure 7 The functional area 11a includes an explosion-proof valve triggering area 11c, the through hole 12a includes a first exhaust hole 12c, the number of the first exhaust holes 12c is multiple, at least a part of the first exhaust holes 12c is connected to the explosion-proof valve triggering area 11c, and the part of the first exhaust holes 12c and the other part of the first exhaust holes 12c are centrally symmetrical about the symmetry axis 11f.

[0133] The explosion-proof valve triggering area 11c is connected to at least a portion of the first exhaust hole 12c. After the battery cell 50 undergoes thermal runaway, the fluid medium is the high-temperature and high-pressure gas generated, which can pass through the first exhaust hole 12c and contact the explosion-proof valve triggering area 11c, thereby triggering the explosion-proof valve 13 to open and discharge the high-temperature and high-pressure gas outside the battery cell 50.

[0134] At least a portion of the first exhaust holes 12c are connected to the explosion-proof valve triggering area 11c. It can be that only a portion of the first exhaust holes 12c are connected to the explosion-proof valve triggering area 11c, while another portion of the first exhaust holes 12c that is centrally symmetrical with the portion of the first exhaust holes 12c about the symmetry axis 11f is not connected to the explosion-proof valve triggering area 11c; or two portions of the first exhaust holes 12c are centrally symmetrical about the symmetry axis 11f, and both portions of the first exhaust holes 12c are connected to the explosion-proof valve triggering area 11c.

[0135] In this way, the top bracket 12 can be rotated along the symmetry axis 11f to at least two of the positions so that at least part of the first exhaust hole 12c can be connected with the explosion-proof valve trigger area 11c, which is beneficial to improve the probability of assembling the top bracket 12 and the cover plate kit 11 to the position where the first exhaust hole 12c is connected with the explosion-proof valve trigger area 11c at one time, which is beneficial to improve assembly efficiency and reduce the probability of assembly errors.

[0136] In some embodiments, see Figure 3 and Figure 6At least part of the first exhaust holes 12c are connected to the explosion-proof valve triggering area 11c, so that the fluid medium flowing out of the first exhaust holes 12c can impact the explosion-proof valve triggering area 11c and trigger the explosion-proof valve 13 to open.

[0137] In some embodiments, see Figure 8 The top bracket 12 is provided with a second spacer 122, and the second spacer 122 and the cover plate kit 11 are spaced apart along the first direction. The first exhaust hole 12c is provided at the second spacer 122, which is conducive to the top bracket 12 to avoid the cover plate kit 11 through the second spacer 122, so that the explosion-proof valve 13 has more ample space for installation.

[0138] In some embodiments, see Fig.10 The first exhaust holes 12c are divided into at least two groups, and the two groups of first exhaust holes 12c are plane-symmetrical about the first center plane 11d.

[0139] That is to say, the shapes, sizes and distances from the first center plane 11d of the first exhaust holes 12c that are plane-symmetrical about the first center plane 11d are completely consistent.

[0140] This is helpful to simplify the manufacturing process of the two groups of first exhaust holes 12c, improve production efficiency and reduce production costs.

[0141] In some embodiments, see Fig.10 The first exhaust holes 12c are divided into at least two groups, and the two groups of first exhaust holes 12c are plane-symmetrical about the second center plane 11e.

[0142] That is to say, the shapes, sizes and distances from the second center plane 11 e of the first exhaust holes 12 c that are plane-symmetrical about the second center plane 11 e are completely consistent.

[0143] This is helpful to simplify the manufacturing process of the two groups of first exhaust holes 12c, improve production efficiency and reduce production costs.

[0144] In some embodiments, see Fig.10 The first exhaust holes 12c are divided into at least four groups, two groups of first exhaust holes 12c are plane-symmetrical with the other two groups of first exhaust holes 12c about the first center plane 11d, and the two groups of first exhaust holes 12c located on the same side of the first center plane 11d along the second direction are plane-symmetrical with respect to the second center plane 11e.

[0145] That is to say, among the four groups of first exhaust holes 12c, for any group of first exhaust holes 12c, there is a group of first exhaust holes 12c that is plane-symmetrical with the first center plane 11d, a group of first exhaust holes 12c that is plane-symmetrical with the second center plane 11e, and a group of first exhaust holes 12c that is center-symmetrical with the symmetry axis 11f.

[0146] This helps to make the size, shape, position relative to the first center plane 11d and position relative to the second center plane 11e of the first exhaust holes 12c in each group consistent, which further helps to simplify the manufacturing process of the first exhaust holes 12c, improve production efficiency and reduce production costs.

[0147] There are multiple first exhaust holes 12c in each group, which is beneficial for reducing the cross-sectional area of ​​each first exhaust hole 12c while meeting the flow requirements of the fluid medium passing therethrough, thereby improving the overall structural strength of the top bracket 12 and reducing the probability of the top bracket 12 being deformed under the impact of the fluid medium and affecting the discharge of the fluid medium from the explosion-proof valve.

[0148] The sizes and shapes of the first exhaust holes 12c in each group may be completely consistent or different.

[0149] In some embodiments, on a projection plane perpendicular to the first direction, the projections of the first exhaust holes 12c are all located within the projection range of the explosion-proof valve triggering area 11c.

[0150] In this way, on the one hand, it is beneficial to shorten the distance between the first exhaust hole 12c and the explosion-proof valve trigger area 11c, so that the fluid medium flowing out of the first exhaust hole 12c can reach the explosion-proof valve 13 faster, which is beneficial to shorten the response time of the opening of the explosion-proof valve 13 and improve safety; on the other hand, it is beneficial to make the top bracket 12 have at least two positions that can make all the first exhaust holes 12c connected with the explosion-proof valve trigger area 11c, thereby improving the utilization rate of the first exhaust holes 12c and making the top bracket 12 in different positions relative to the cover plate kit 11, which can meet the flow rate of the fluid medium passing through the first exhaust holes 12c to meet the safety release requirements.

[0151] In some embodiments, see Figure 3 , Figure 8 , Fig. 9 and Fig.10 The functional area 11a includes an explosion-proof valve triggering area 11c, and the through hole 12a includes a second exhaust hole 12d. The second exhaust hole 12d is a symmetrical structure and forms a central symmetry about the symmetry axis 11f. On the projection plane perpendicular to the first direction, at least part of the projection of the second exhaust hole 12d is located within the projection range of the explosion-proof valve triggering area 11c.

[0152] That is, after rotating 180° with the symmetric axis 11f as the rotation axis, the second exhaust hole 12d completely overlaps with the second exhaust hole 12d before the rotation.

[0153] In this way, the top bracket 12 has at least two positions that enable all the second exhaust holes 12d to be connected to the explosion-proof valve trigger area 11c, which helps to reduce the probability that the fluid medium cannot enter the explosion-proof valve 13 from the second exhaust holes 12d due to assembly errors between the top bracket 12 and the cover plate kit 11.

[0154] It can be understood that the symmetry axis 11f passes through the second exhaust hole 12d.

[0155] In some embodiments, see Figures 7 to 10 The top bracket 12 is provided with a plurality of first connection parts 123 , and the cover plate kit 11 is provided with a plurality of second connection parts 111 . The first connection parts 123 cooperate with the second connection parts 111 to connect the top bracket 12 and the cover plate kit 11 .

[0156] In this way, a fixed fit between the top bracket 12 and the cover plate kit 11 is achieved.

[0157] The specific forms of the first connecting portion 123 and the second connecting portion 111 are not limited. For example, one of the first connecting portion 123 and the second connecting portion 111 is a buckle, and the other is a snap-fitting hole. The buckle can be inserted into the snap-fitting hole and can cooperate with a part of the inner wall of the snap-fitting hole in the opposite direction of insertion to stop the cover plate kit 11 and the top bracket 12.

[0158] In some embodiments, see Figures 8 to 10 A portion of the first connection portion 123 and another portion of the first connection portion 123 form central symmetry about the symmetry axis 11f.

[0159] That is, after a portion of the first connection portion 123 is rotated 180° about the symmetry axis 11 f as the rotation axis, it completely overlaps with another portion of the first connection portion 123 before the rotation.

[0160] In this way, there are at least two relative positions between the cover plate kit 11 and the top bracket 12 that can realize the connection and cooperation between the first connecting part 123 and the second connecting part 111, which is beneficial to reduce the probability of the cover plate kit 11 and the top bracket 12 being unable to connect due to position error, and is beneficial to improving the production and assembly efficiency of the top bracket 12 and the cover plate kit 11, and is beneficial to reducing the manufacturing cost of the battery cell 50.

[0161] In some embodiments, see Figure 7 A portion of the second connection portion 111 and another portion of the second connection portion 111 are centrally symmetrical about the symmetry axis 11f.

[0162] That is, after a portion of the second connection portion 111 is rotated 180° about the symmetry axis 11 f as the rotation axis, it completely overlaps with another portion of the second connection portion 111 before the rotation.

[0163] In this way, there are at least two relative positions between the cover plate kit 11 and the top bracket 12 that can realize the connection and cooperation between the first connecting part 123 and the second connecting part 111, which is beneficial to reduce the probability of the cover plate kit 11 and the top bracket 12 being unable to connect due to position error, and is beneficial to improving the production and assembly efficiency of the top bracket 12 and the cover plate kit 11, and is beneficial to reducing the manufacturing cost of the battery cell 50.

[0164] In some embodiments, see Fig.10 , at least two first connection portions 123 are plane-symmetrical about the first center plane 11d.

[0165] That is to say, the shapes and sizes of the two first connection portions 123 and the distances between the two and the first center plane 11 d are completely consistent.

[0166] This is beneficial for unifying the structure and position of the first connecting portion 123 , simplifying the manufacturing process, and reducing production costs.

[0167] In some embodiments, see Fig.10 , at least two first connection portions 123 are plane-symmetrical about the second center plane 11e.

[0168] That is to say, the shapes and sizes of the two first connection portions 123 and the distances between the two and the second center plane 11 e are completely consistent.

[0169] This is beneficial for unifying the structure and position of the first connecting portion 123 , simplifying the manufacturing process, and reducing production costs.

[0170] In some embodiments, see Fig.10 The number of the first connection parts 123 is at least four, the two first connection parts 123 are plane-symmetrical with the other two first connection parts 123 about the first center plane 11d, and the two first connection parts 123 located on the same side of the first center plane 11d along the second direction are plane-symmetrical with respect to the second center plane 11e.

[0171] That is to say, among the four first connection parts 123, for any first connection part 123, there is a first connection part 123 that is plane-symmetrical with the first center plane 11d, one first connection part 123 that is plane-symmetrical with the second center plane 11e, and one first connection part 123 that is center-symmetrical with the symmetry axis 11f.

[0172] This is beneficial for unifying the structures and positions of the first connection parts 123 , simplifying the manufacturing process, and reducing production costs.

[0173] In some embodiments, see Fig.10, at least two second connection portions 111 are plane-symmetrical about the first center plane 11d.

[0174] That is to say, the shapes and sizes of the two second connection portions 111 and the distances between the two and the first center plane 11 d are completely consistent.

[0175] This is beneficial for unifying the structure and position of the second connecting portion 111 , simplifying the manufacturing process, and reducing production costs.

[0176] In some embodiments, see Fig.10 , at least two second connection portions 111 are plane-symmetrical about the second center plane 11e.

[0177] That is to say, the shapes and sizes of the two second connection portions 111 and the distances between the two and the second center plane 11 e are completely consistent.

[0178] This is beneficial for unifying the structure and position of the second connecting portion 111 , simplifying the manufacturing process, and reducing production costs.

[0179] In some embodiments, see Fig.10 The number of the second connection parts 111 is at least four, the two second connection parts 111 are plane-symmetrical with the other two second connection parts 111 about the first center plane 11d, and the two second connection parts 111 located on the same side of the first center plane 11d along the second direction are plane-symmetrical with respect to the second center plane 11e.

[0180] That is to say, among the four second connection parts 111, for any second connection part 111, there is a second connection part 111 that is plane-symmetrical with the first center plane 11d, one second connection part 111 is plane-symmetrical with the second center plane 11e, and one second connection part 111 is center-symmetrical with the symmetry axis 11f.

[0181] This is beneficial for unifying the structures and positions of the second connecting parts 111 , simplifying the manufacturing process, and reducing production costs.

[0182] Understandably, see Figure 7 and Fig.10 The number of the first connection parts 123 is the same as the number of the second connection parts 111, and the two are connected in a one-to-one correspondence.

[0183] In some embodiments, see Figure 8 The first connection portion 123 is disposed on one side of the top bracket 12 facing the cover plate set 11 along the first direction, and the second connection portion 111 is disposed on one side of the cover plate set 11 facing the top bracket 12 along the first direction, so that the two are connected along the first direction.

[0184] During the process of assembling the top bracket 12 and the cover plate kit 11 , it is necessary to facilitate operators or equipment to carry and apply force to the top bracket 12 or the cover plate kit 11 so that the top bracket 12 and the cover plate kit 11 are connected.

[0185] In some embodiments, see Fig. 9 and Fig.10 A mounting surface 124 is provided on one side of the top bracket 12 away from the cover plate kit 11 along the first direction, so that an operator or equipment can apply a force to the top bracket 12 to connect with the cover plate kit 11.

[0186] The specific type of the mounting surface 124 is not limited, and can be adapted to the assembly process. For example, the mounting surface 124 is a plane, so that the purpose of transporting and mounting the top bracket 12 can be achieved by using a vacuum suction cup to absorb the mounting surface 124.

[0187] In some embodiments, the number of the mounting surface 124 is one, the mounting surface 124 is a symmetrical structure, and forms central symmetry about the symmetry axis 11 f.

[0188] In this way, it is advantageous for the top bracket 12 to have at least two placement positions, which can facilitate operators and equipment to carry and apply force to the top bracket 12 through the installation surface 124 .

[0189] In some embodiments, see Fig. 9 and Fig.10 The number of the mounting surfaces 124 is at least two, which is beneficial to balancing the force of the top bracket 12 during the process of transporting and installing the top bracket 12 through the mounting surfaces 124.

[0190] In some embodiments, see Fig. 9 and Fig.10 The two mounting surfaces 124 are respectively arranged at the two ends of the top bracket 12 along the length direction of the top bracket 12, which is more conducive to balancing the force of the top bracket 12 during the process of transporting and installing the top bracket 12 through the mounting surfaces 124, thereby reducing the probability of the top bracket 12 being overturned, skewed, and other problems.

[0191] In an embodiment with at least two mounting surfaces 124, see Fig.10 One mounting surface 124 and another mounting surface 124 are centrally symmetrical about the symmetry axis 11f.

[0192] That is, after one mounting surface 124 is rotated 180° about the symmetry axis 11f as the rotation axis, it completely overlaps with the other mounting surface 124 before the rotation.

[0193] In this way, the top bracket 12 is advantageously provided with at least two placement positions to facilitate operators and equipment to pick up the mounting surface 124, thereby reducing the probability of the top bracket 12 being unable to be picked up through the mounting surface 124 due to the operator and equipment being too far offset from the mounting surface 124 during the process of moving the top bracket 12.

[0194] It can be understood that the through hole 12 a is located outside the range of the mounting surface 124 .

[0195] In some embodiments, see Fig. 9 The first connection portion 123 is disposed on the opposite side of the mounting surface 124 along the first direction, so that a force is directly applied to the first connection portion 123 through the mounting surface 124 to connect the first connection portion 123 to the second connection portion 111 .

[0196] In some embodiments, see Fig.10 The two mounting surfaces 124 are plane-symmetrical about the first center plane 11d, and the mounting surfaces 124 are symmetrical structures and are plane-symmetrical about the second center plane 11e.

[0197] This helps unify the shapes, sizes and positions of the two mounting surfaces 124 , reduces the difficulty of design and manufacturing, and helps reduce production costs.

[0198] In some embodiments, see Figures 8 to 10 The top bracket 12 is a symmetrical structure and is centrally symmetrical about the symmetry axis 11f.

[0199] That is to say, after the top bracket 12 is rotated 180° with the symmetry axis 11f as the rotation axis, it completely overlaps with the position before the rotation.

[0200] This helps to improve the flexibility of the top bracket 12 and other components in the battery cell 50, improves installation efficiency, and reduces production costs.

[0201] In some embodiments, see Figures 8 to 10 The top bracket 12 is plane-symmetrical about the first center plane 11d and plane-symmetrical about the second center plane 11e.

[0202] This is beneficial to further improve the flexibility of the top bracket 12 and other components in the battery cell 50, simplify the design and manufacturing difficulty of the top bracket 12, and reduce the production cost.

[0203] The battery cell 50 in a specific embodiment of the present invention is as follows:

[0204] The battery cell 50 includes a shell 20 and an end cover assembly 10, wherein the shell 20 is provided with a receiving chamber 20a, and the receiving chamber 20a is open on one side along the first direction, and the end cover assembly 10 includes a top bracket 12 and a cover plate set 11, wherein the cover plate set 11 is provided at the open position of the receiving chamber 20a, and the top bracket 12 is provided in the receiving chamber 20a, and the cover plate set 11 is provided with a second connecting portion 111, an explosion-proof valve triggering area 11c and a through injection hole 11b, and the intersection position of the first center plane 11d of the cover plate set 11 along the second direction and the second center plane 11e of the cover plate set 11 along the third direction forms a symmetry axis 11f, and the top bracket 12 is provided on one side of the cover plate set 11 along the first direction, and the first direction, the second direction and the third direction are perpendicular to each other, and the top bracket 12 is provided with two first spacers 121, a through first exhaust hole 12c, a through second exhaust hole 12d, a first connecting portion 123 and a mounting surface 124, and the two first spacers The first spacer 121 is centrally symmetrical about the symmetry axis 11f, the first spacer 121 and the cover plate set 11 are spaced apart along the first direction, the flow hole 12b is located on the first spacer 121, the first spacer 121 is provided with a plurality of flow holes 12b and is divided into two groups, the two groups of flow holes 12b are spaced apart, on the projection plane perpendicular to the first direction, the projection of the injection hole 11b is located between the projections of the two groups of flow holes 12b, the two first spacers 121 are plane-symmetrical about the first center plane 11d, the two groups of flow holes 12b in each first spacer 121 are plane-symmetrical about the second center plane 11e, the first exhaust holes 12c are divided into at least four groups, the two groups of first exhaust holes 12c are plane-symmetrical about the first center plane 11d with the other two groups of first exhaust holes 12c, and the two groups of first exhaust holes 12c located on the same side of the first center plane 11d along the second direction are plane-symmetrical about the second center plane 11e. The second exhaust hole 12d is a symmetrical structure, and forms central symmetry about the symmetry axis 11f. On the projection plane perpendicular to the first direction, the projections of the second exhaust hole 12d and each first exhaust hole 12c are located within the projection range of the explosion-proof valve triggering area 11c. The first connecting portion 123 cooperates with the second connecting portion 111 to connect the top bracket 12 with the cover plate kit 11. A portion of the first connecting portion 123 and another portion of the first connecting portion 123 form central symmetry about the symmetry axis 11f; a portion of the second connecting portion 111 and another portion of the second connecting portion 111 form central symmetry about the symmetry axis 11f. At least two first connecting portions 123 are plane-symmetrical about the first center plane 11d; at least two first connecting portions 123 are plane-symmetrical about the second center plane 11e. At least two second connecting portions 111 are plane-symmetrical about the first center plane 11d; at least two second connecting portions 111 are plane-symmetrical about the second center plane 11e.At least two mounting surfaces 124 are provided on the side surface of the top bracket 12 away from the cover plate kit 11 along the first direction. One mounting surface 124 is centrally symmetrical with the other mounting surface 124 about the symmetry axis 11f. The two mounting surfaces 124 are plane-symmetrical about the first center plane 11d. The mounting surfaces 124 are symmetrical structures and are plane-symmetrical about the second center plane 11e.

[0205] The present utility model embodiment also provides an end cap assembly 10, see Figures 3 to 6 The end cover assembly 10 is used for sealing cooperation with the housing 20 of the battery cell 50 . The end cover assembly 10 includes a cover plate kit 11 and a top bracket 12. The cover plate kit 11 is arranged at the open position of the accommodating chamber 20a. The cover plate kit 11 is provided with a functional area 11a. The functional area 11a includes at least one of a liquid injection hole 11b and an explosion-proof valve trigger area 11c. The intersection of a first center plane 11d of the cover plate kit 11 along the second direction and a second center plane 11e of the cover plate kit 11 along the third direction forms a symmetry axis 11f; the top bracket 12 is arranged on one side of the cover plate kit 11 along the first direction and is connected to the cover plate kit 11. The first direction, the second direction and the third direction are perpendicular to each other. The top bracket 12 is provided with a plurality of through holes 12a that penetrate therethrough; a part of the through holes 12a is centrally symmetrical with another part of the through holes 12a about the symmetry axis 11f, wherein at least one through hole 12a is connected to the functional area 11a, and / or a through hole 12a connected to the functional area 11a is centrally symmetrical about the symmetry axis 11f.

[0206] In this way, there are at least two different relative positions between the top bracket 12 and the cover plate kit 11, which can enable the functional area 11a to cooperate with the through hole 12a, thereby playing a certain anti-fool effect in the assembly process of the cover plate kit 11 and the top bracket 12, which is beneficial to reduce the probability of assembly errors between the cover plate kit 11 and the top bracket 12, and is beneficial to improving the production assembly efficiency of the top bracket 12 and the cover plate kit 11.

[0207] In some embodiments, see Figures 8 to 10 The top bracket 12 is provided with a plurality of first connection parts 123, and the cover plate kit 11 is provided with a plurality of second connection parts 111. The first connection parts 123 cooperate with the second connection parts 111 to connect the top bracket 12 and the cover plate kit 11, and a part of the first connection parts 123 and another part of the first connection parts 123 form central symmetry about the symmetry axis.

[0208] In this way, there are at least two relative positions between the cover plate kit 11 and the top bracket 12 that can realize the connection and cooperation between the first connecting part 123 and the second connecting part 111, which is beneficial to reduce the probability of the cover plate kit 11 and the top bracket 12 being unable to connect due to position error, and is beneficial to improving the production and assembly efficiency of the top bracket 12 and the cover plate kit 11.

[0209] In some embodiments, see Figure 7 A portion of the second connection portion 111 and another portion of the second connection portion 111 are centrally symmetrical about the symmetry axis 11f.

[0210] In this way, there are at least two relative positions between the cover plate kit 11 and the top bracket 12 that can realize the connection and cooperation between the first connecting part 123 and the second connecting part 111, which is beneficial to reduce the probability of the cover plate kit 11 and the top bracket 12 being unable to connect due to position error, and is beneficial to improving the production and assembly efficiency of the top bracket 12 and the cover plate kit 11.

[0211] In some embodiments, see Fig.10 A surface of the top bracket facing away from the cover plate kit along the first direction is provided with at least two mounting surfaces, and one mounting surface is centrally symmetrical with another mounting surface about the symmetry axis.

[0212] In this way, the top bracket 12 is advantageously provided with at least two placement positions to facilitate operators and equipment to pick up the mounting surface 124, thereby reducing the probability of the top bracket 12 being unable to be picked up through the mounting surface 124 due to the operator and equipment being too far offset from the mounting surface 124 during the process of moving the top bracket 12.

[0213] The embodiment of the utility model further provides a battery 100, comprising a box body 40 and the battery cell 50 in the above embodiment. An installation space is provided in the box body 40, and the battery cell 50 is arranged in the installation space.

[0214] The box body 40 can protect the battery cells 50 and provide a placement location.

[0215] In this way, by adopting the battery cell 50 in the aforementioned embodiment, it is helpful to improve the overall production and assembly efficiency of the battery 100 and reduce the risk of assembly errors.

[0216] In some embodiments, see Figure 2 and Fig.11 The first direction is the direction of gravity. The battery cell 50 also includes an electrode assembly 30. The accommodating cavity 20a is open on the bottom side along the first direction. The electrode assembly 30 is located in the accommodating cavity 20a. The top bracket 12 is located between the cover plate kit 11 and the electrode assembly 30 to support the electrode assembly 30.

[0217] That is, the cover plate set 11 is located at the bottom side of the electrode assembly 30 , and the cover plate set 11 supports the top support 12 .

[0218] It can be understood that, under the action of gravity, the electrode assembly 30 tends to move toward the cover plate assembly 11 .

[0219] In this way, by supporting the electrode assembly 30 through the top bracket 12, on the one hand, the probability of short circuit caused by contact between the electrode assembly 30 and the cover plate kit 11 is reduced; on the other hand, the top bracket 12 can play a shielding role, reducing the probability of foreign matter remaining in the electrode assembly 30 falling onto the cover plate kit 11 under the action of gravity and causing a short circuit.

[0220] The embodiment of the utility model further provides an electric device, which includes the battery 100 in the above embodiment, and the battery 100 is used as a power source of the electric device.

[0221] Thus, by adopting the battery 100 in the aforementioned embodiment, it is helpful to improve the overall production and assembly efficiency of the electrical device and reduce the risk of assembly errors.

[0222] The various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction.

[0223] The above are only preferred embodiments of the present invention and are not intended to limit the embodiments of the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that: The battery cell comprises: A housing is provided with a receiving cavity, wherein one side of the receiving cavity is open along a first direction; An end cover assembly, comprising a cover plate set and a top bracket, wherein the cover plate set is arranged at the open position of the accommodating cavity, the cover plate set is provided with a functional area, the functional area includes at least one of a liquid injection hole and an explosion-proof valve triggering area, and the intersection position of a first central plane of the cover plate set along a second direction and a second central plane of the cover plate set along a third direction forms a symmetry axis; the top bracket is arranged in the accommodating cavity and connected to the cover plate set, the first direction, the second direction and the third direction are perpendicular to each other, and the top bracket is provided with a plurality of through holes; A portion of the through holes is centrally symmetrical with another portion of the through holes about the symmetry axis, wherein at least one of the through holes is connected to the functional area, and / or a through hole connected to the functional area is centrally symmetrical about the symmetry axis.

2. The battery cell according to claim 1, characterized in that: The functional area includes the injection hole, the through hole includes the flow hole, the top bracket includes two first spacers, the two first spacers are centrally symmetrical about the symmetry axis, the first spacers and the cover plate kit are spaced apart along the first direction, the flow hole is located on the first spacer, and on the projection plane perpendicular to the first direction, the projection of the injection hole is located within the projection range of the first spacer and outside the projection range of the flow hole.

3. The battery cell according to claim 2, characterized in that: The first spacing portion is provided with a plurality of the flow holes which are divided into two groups. The two groups of flow holes are arranged at intervals. On a projection plane perpendicular to the first direction, the projection of the injection hole is located between the projections of the two groups of flow holes.

4. The battery cell according to claim 3, characterized in that: The two first partitions are symmetrical about the first center plane, and the two groups of flow holes in each first partition are symmetrical about the second center plane.

5. The battery cell according to claim 1, characterized in that: The functional area includes the explosion-proof valve triggering area, the through hole includes a first exhaust hole, the number of the first exhaust holes is multiple, at least some of the first exhaust holes are connected to the explosion-proof valve triggering area, and the first exhaust holes in this part are centrally symmetrical with another part of the first exhaust holes about the symmetry axis.

6. The battery cell according to claim 5, characterized in that: The first exhaust holes are divided into at least two groups, and the two groups of the first exhaust holes are plane-symmetrical about the first central plane; Alternatively, the two groups of the first exhaust holes are plane-symmetrical about the second center plane.

7. The battery cell according to claim 5, characterized in that: The first exhaust holes are divided into at least four groups, two groups of the first exhaust holes are symmetrical with the other two groups of the first exhaust holes about the first center plane, and two groups of the first exhaust holes located on the same side of the first center plane along the second direction are symmetrical about the second center plane.

8. The battery cell according to claim 5, characterized in that: On a projection plane perpendicular to the first direction, the projections of the first exhaust holes are all located within the projection range of the explosion-proof valve triggering area.

9. The battery cell according to claim 1, characterized in that: The functional area includes the explosion-proof valve triggering area, the through hole includes a second exhaust hole, the second exhaust hole is a symmetrical structure, and forms central symmetry about the symmetry axis, and on the projection plane perpendicular to the first direction, at least part of the projection of the second exhaust hole is located within the projection range of the explosion-proof valve triggering area.

10. The battery cell according to claim 1, characterized in that: The top bracket is provided with a plurality of first connecting parts, and the cover plate set is provided with a plurality of second connecting parts, the first connecting parts cooperate with the second connecting parts to connect the top bracket and the cover plate set, and a part of the first connecting parts and another part of the first connecting parts form central symmetry about the symmetry axis; And / or, a portion of the second connection portion and another portion of the second connection portion form central symmetry about the symmetry axis.

11. The battery cell according to claim 10, characterized in that: At least two of the first connecting parts are plane-symmetrical about the first center plane; And / or, at least two of the first connecting portions are plane-symmetrical about the second center plane.

12. The battery cell according to claim 10, characterized in that: At least two of the second connecting parts are plane-symmetrical about the first center plane; And / or, at least two of the second connecting portions are plane-symmetrical about the second center plane.

13. The battery cell according to claim 1, characterized in that: The top bracket is provided with at least two mounting surfaces on a side surface facing away from the cover plate kit along the first direction, and one mounting surface is centrally symmetrical with another mounting surface about the symmetry axis.

14. The battery cell according to claim 13, characterized in that: The two mounting surfaces are symmetrical about the first center plane, and the mounting surfaces are symmetrical structures and are symmetrical about the second center plane.

15. The battery cell according to claim 1, characterized in that: The top bracket is a symmetrical structure and is centrally symmetrical about the symmetry axis.

16. The battery cell according to claim 15, characterized in that: The top bracket is plane-symmetrical about the first center plane, and is plane-symmetrical about the second center plane.

17. An end cap assembly, characterized in that: The end cap assembly comprises: A cover plate kit is provided with a functional area, the functional area includes at least one of a liquid injection hole and an explosion-proof valve triggering area, and an intersection position of a first central plane of the cover plate kit along the second direction and a second central plane of the cover plate kit along the third direction forms a symmetry axis; A top bracket, disposed on one side of the cover plate kit along a first direction and connected to the cover plate kit, the first direction, the second direction and the third direction are perpendicular to each other, and the top bracket is provided with at least one through hole; A portion of the through holes is centrally symmetrical with another portion of the through holes about the symmetry axis, wherein at least one of the through holes is connected to the functional area, and / or a through hole connected to the functional area is centrally symmetrical about the symmetry axis.

18. The end cap assembly according to claim 17, wherein: The top bracket is provided with a plurality of first connecting parts, and the cover plate set is provided with a plurality of second connecting parts, the first connecting parts cooperate with the second connecting parts to connect the top bracket and the cover plate set, and a part of the first connecting parts and another part of the first connecting parts form central symmetry about the symmetry axis; And / or, a portion of the second connection portion and another portion of the second connection portion form central symmetry about the symmetry axis.

19. The end cap assembly according to claim 17, wherein: The top bracket is provided with at least two mounting surfaces on a side surface facing away from the cover plate kit along the first direction, and one mounting surface is centrally symmetrical with another mounting surface about the symmetry axis.

20. A battery, characterized in that: The battery comprises a housing and the battery cell according to any one of claims 1 to 16, wherein an installation space is provided in the housing, and the battery cell is arranged in the installation space.

21. The battery according to claim 20, characterized in that The first direction is the direction of gravity, the battery cell further includes an electrode assembly, the accommodating cavity is open at the bottom side along the first direction, the electrode assembly is located in the accommodating cavity, and the top bracket is located between the cover plate kit and the electrode assembly to support the electrode assembly.

22. An electrical device, characterized in that: The electrical device comprises the battery according to claim 20 or 21, and the battery is used as a power source for the electrical device.

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