Battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly and a first reinforcing part, the shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, and the first reinforcing piece is arranged on the shell, used for reinforcing the strength of the shell and used for limiting movement of the electrode assembly relative to the shell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, the reliability of batteries is an issue that cannot be ignored. Therefore, how to enhance the reliability of batteries is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes: a shell, an electrode assembly, and a first reinforcement member; the shell has a accommodating cavity, the electrode assembly is arranged in the accommodating cavity, and the first reinforcement member is arranged in the shell to enhance the strength of the shell and is used to limit the movement of the electrode assembly relative to the shell.

[0006] On the one hand, by arranging the first reinforcement in the shell, the first reinforcement can abut between the side of the electrode assembly and the corresponding side wall of the shell, thereby preventing the electrode assembly from moving relative to the shell and reducing the shaking of the electrode assembly in the shell, that is, it can reduce the breaking of the pole ears or adapter sheets caused by pulling the pole ears and adapter sheets due to the shaking of the electrode assembly, thereby reducing the occurrence of short circuits in the main body of the electrode assembly and improving the reliability of the electrode assembly and the battery cell; on the other hand, the first reinforcement is arranged in the shell, which can also play a role in strengthening the strength of the shell to a certain extent, so as to further improve the reliability of the battery cell.

[0007] In some embodiments, the shell includes a side wall forming a receiving cavity, and the first reinforcement member is at least partially protruded from the side wall.

[0008] Such a design is conducive to simplifying the molding process of the first reinforcement member and improving the processing efficiency of the shell. At the same time, while improving the strength of the shell and the stability of the electrode assembly, the weight of the shell will not be increased, which is conducive to ensuring the energy density of the battery cell.

[0009] In some embodiments, the first reinforcement is formed with a receiving groove, and at least a portion of the electrode assembly extends into the receiving groove.

[0010] By providing a receiving groove on the first reinforcement, the electrode assembly at least partially extends into the receiving groove, which can prevent the electrode assembly from moving relative to the shell, and at the same time increase the volume size of the electrode assembly and improve the volume energy density of the battery cell.

[0011] In some embodiments, the side wall includes two first side walls arranged on both sides along the length direction of the electrode assembly, at least one first side wall is provided with a first reinforcement member, and one end of the electrode assembly in the length direction extends into the accommodating groove.

[0012] One end of the electrode assembly in the length direction extends into the accommodating groove, which can limit the shaking of the electrode assembly in the accommodating cavity along the length direction and thickness direction of the electrode assembly. At the same time, the first reinforcement member is arranged on the first side wall, which can reduce the space occupied inside the shell and is beneficial to improving the energy density of the battery cell.

[0013] In some embodiments, each first side wall is provided with a first reinforcement, and two receiving grooves of the two first reinforcements are spaced apart and arranged opposite to each other along the length direction of the electrode assembly, and two ends of the electrode assembly extend into the receiving grooves respectively.

[0014] By providing the first reinforcement members on both first side walls, both ends of the electrode assembly along the length direction extend into the accommodating groove, which can better limit the position of the electrode assembly in the shell and reduce the shaking of the electrode assembly along its length direction.

[0015] In some embodiments, the receiving groove is an arc-shaped groove.

[0016] By setting the accommodating groove as an arc-shaped groove, the contact area between the end of the electrode assembly and the groove wall can be increased, and the end of the electrode assembly can be inserted into the arc-shaped groove more smoothly, thereby avoiding damage to the electrode assembly.

[0017] In some embodiments, the electrode assembly is wound so that both ends of the electrode assembly in the length direction are arc-shaped portions; when the number of accommodating grooves is one, the arc-shaped portion adjacent to the arc-shaped groove extends into the corresponding arc-shaped groove; when the number of accommodating grooves is two, the two arc-shaped portions respectively extend into the corresponding arc-shaped grooves.

[0018] By designing both ends of the electrode assembly in the length direction to be arc-shaped portions, they can match the arc-shaped grooves, thereby achieving a better limiting effect on the electrode assembly and facilitating the insertion of the electrode assembly into the shell.

[0019] In some embodiments, the radius of the arc-shaped groove is R1, the radius of the arc-shaped portion is R2, and the distance between the inner walls on two opposite sides in the width direction of the shell is W1, satisfying R2<R1≤W1 / 2.

[0020] By setting the radius of the arc-shaped groove to be larger than the radius of the arc-shaped portion and less than or equal to half of the distance between the inner walls on both sides of the shell in the width direction, the risk of interference with the first reinforcement is reduced when the electrode assembly is assembled into the shell, and scratches and damage to the electrode assembly are avoided. At the same time, the relative movement of the electrode assembly to the shell can be better restricted, reducing the risk of damaging the tab or the adapter.

[0021] In some embodiments, the radius of the arc-shaped groove is R1, the radius of the arc-shaped portion is R2, and the distance between the inner walls on two opposite sides in the width direction of the shell is W1, satisfying R2<R1≤W1 / 4.

[0022] When the number of electrode assemblies accommodated is two, by setting the radius of the arc-shaped groove to be larger than the radius of the arc-shaped portion and less than or equal to one-fourth of the distance between the inner walls on both sides of the shell width direction, two arc-shaped grooves can be set on the same first reinforcement member, so that the arc-shaped portions of the two electrode assemblies extend into the corresponding arc-shaped grooves respectively, and when the electrode assembly is assembled into the shell, the risk of interference with the first reinforcement member is reduced, and scratches and damage to the electrode assembly are avoided. At the same time, the relative movement of the electrode assembly to the shell can be better restricted, reducing the risk of damaging the tabs or adapters. At the same time, the provision of two electrode assemblies can also increase the energy density of the battery cell.

[0023] In some embodiments, the number of first reinforcement members is one or more. When the number of first reinforcement members is one, the first reinforcement member is extended along the height direction of the electrode assembly. When the number of first reinforcement members is multiple, multiple first reinforcement members are arranged at intervals along the height direction of the electrode assembly.

[0024] When there is one first reinforcement member, the first reinforcement member is extended along the height direction of the electrode assembly, which can strengthen the side wall of the shell as a whole and improve the deformation resistance of the shell; when there are multiple first reinforcement members, the multiple first reinforcement members are arranged at intervals along the height direction of the electrode assembly, which can limit the movement of the electrode assembly relative to the shell while reducing the space occupied by the first reinforcement member inside the shell, thereby improving the energy density of the battery cell.

[0025] In some embodiments, the extension length of the first reinforcement along the height direction of the electrode assembly is (H2), and the height of the shell is (H1), satisfying 0.1≤H2 / H1<1.

[0026] The extension length of the first reinforcement will affect the number of first reinforcements arranged on the side wall. Reasonable control of the extension length of the first reinforcement can effectively reinforce the side wall of the shell and avoid structural interference caused by the first reinforcement being too long, which is beneficial to molding processing.

[0027] In some embodiments, the relationship between the extension length (H2) of the first reinforcement along the height direction of the electrode assembly and the height (H1) of the shell satisfies 0.5≤H2 / H1<1.

[0028] The extension length of the first reinforcement member is reasonably controlled, and a first reinforcement member is provided on a side wall, so as to improve the structural strength of the battery shell and reduce the deformation of the shell structure while ensuring a reasonable manufacturing cost.

[0029] In some embodiments, the battery cell includes a plurality of electrode assemblies, which are arranged in parallel and stacked, and the first reinforcement is formed with a plurality of accommodating grooves that match the number of the plurality of electrode assemblies and correspond one to one, and each electrode assembly extends into a corresponding accommodating groove.

[0030] By providing multiple electrode assemblies, the energy density of the battery cell can be improved. The first reinforcement is formed with multiple accommodating grooves that match the number of the multiple electrode assemblies and correspond one to one. Each electrode assembly extends into the corresponding accommodating groove, which can limit the movement of each electrode assembly relative to the shell and reduce the shaking of the electrode assembly to avoid damaging the pole ear or adapter, thereby improving the reliability of the battery cell.

[0031] In some embodiments, the number of electrode assemblies is two, which are respectively a first electrode assembly and a second electrode assembly. The receiving groove includes a first receiving groove and a second receiving groove spaced apart along the thickness direction of the electrode assembly. The end of the first electrode assembly extends into the first receiving groove, and the end of the second electrode assembly extends into the second receiving groove.

[0032] The first electrode assembly and the second electrode assembly are arranged in parallel and stacked, and the first reinforcement is provided with a first accommodating groove and a second accommodating groove correspondingly along the thickness direction of the electrode assembly. The first electrode assembly and the second electrode assembly extend into the corresponding accommodating grooves respectively, and the first electrode assembly and the second electrode assembly can be confined in the corresponding accommodating grooves to prevent the first electrode assembly and the second electrode assembly from moving relative to the shell.

[0033] In some embodiments, the first reinforcement member is disposed on the two end side walls along the length direction of the electrode assembly, the two ends of the first electrode assembly respectively extend into the corresponding first accommodating grooves, and the two ends of the second electrode assembly respectively extend into the corresponding second accommodating grooves.

[0034] The first reinforcement is arranged on the side walls at both ends along the length direction of the electrode assembly, which can improve the deformation resistance of the shell. At the same time, both ends of the first electrode assembly are accommodated in the first accommodating groove and both ends of the second electrode assembly are accommodated in the second accommodating groove. Both ends of the electrode assembly along the length direction can be restricted in the accommodating groove, thereby realizing the overall positioning of the electrode assembly and reducing the shaking of the first electrode assembly and the second electrode assembly along their own length direction, which may cause damage to the pole ear or breakage of the adapter.

[0035] In some embodiments, the first reinforcement member includes a first reinforcement portion and a second reinforcement portion, the first reinforcement portion forms a first accommodating groove, and the second reinforcement portion forms a second accommodating groove; or, the first reinforcement member includes a first reinforcement portion, a second reinforcement portion and a third reinforcement portion, the first reinforcement portion forms a first accommodating groove, the second reinforcement portion forms a second accommodating groove, and the third reinforcement portion connects the first reinforcement portion and the second reinforcement portion.

[0036] The first reinforcement member includes a first reinforcement portion and a second reinforcement portion, the first reinforcement portion forms a first accommodating groove for limiting the shaking of the first electrode assembly, and the second reinforcement portion forms a second accommodating groove for limiting the shaking of the second electrode assembly; or, the first reinforcement member also includes a third reinforcement portion, the third reinforcement portion is used to connect the first reinforcement portion and the second reinforcement portion, thereby improving the first reinforcement member's anti-extrusion deformation ability and reducing the risk of the first reinforcement portion and the second reinforcement portion squeezing the electrode assembly.

[0037] In some embodiments, a recessed groove is formed between ends of any two adjacent electrode assemblies among the plurality of electrode assemblies, and the first reinforcement member at least partially extends into the recessed groove.

[0038] A recessed groove is formed between the ends of any two adjacent electrode assemblies among the multiple electrode assemblies, and the third reinforcement portion of the first reinforcement member can at least partially extend into the recessed groove. The third reinforcement portion cooperates with the first accommodating groove and the second accommodating groove, respectively, to respectively limit the movement of the first electrode assembly and the second electrode assembly relative to the shell, thereby improving the overall positional stability of the electrode assembly.

[0039] In some embodiments, the portion of the first reinforcement member extending into the recessed groove is in contact with a portion of the groove wall surface of the recessed groove.

[0040] The third reinforcement part of the first reinforcement member extends into the concave groove and fits with part of the groove wall surface of the concave groove, that is, the third reinforcement part fits with the end part surface of the electrode assembly, thereby tightly confining the electrode assembly in the receiving groove to prevent the electrode assembly from shaking. At the same time, there is a gap between the third reinforcement part and the bottom of the concave groove, so that the electrolyte can flow better during injection, and the electrolyte at the bottom of the battery shell can flow back through the gap, which can improve the wetting effect on the electrode assembly and help improve the injection efficiency.

[0041] In some embodiments, the first reinforcement member includes a first reinforcement portion and a second reinforcement portion which are spaced apart along a thickness direction of the electrode assembly, and the first reinforcement portion and the second reinforcement portion are spaced apart to form a receiving groove therebetween.

[0042] The first reinforcement part and the second reinforcement part are arranged at intervals along the thickness direction of the electrode assembly, and the space defined between the two is a receiving groove for receiving the end of the electrode assembly. The first reinforcement part and the second reinforcement part are arranged at intervals, and the molding process of the first reinforcement part is simpler, and less space is occupied inside the shell, which is conducive to improving the volume energy density of the battery cell.

[0043] In some embodiments, the sides of the first reinforcement portion and the second reinforcement portion that are close to each other are both arc-shaped.

[0044] The space defined by the side where the first reinforcement part and the second reinforcement part are close to each other is used to accommodate the end of the electrode assembly. The side where the first reinforcement part and the second reinforcement part are close to each other are both arc-shaped, which can better fit the end of the electrode assembly and avoid interference between the end of the electrode assembly and the first reinforcement part and the second reinforcement part, causing damage to the electrode assembly.

[0045] In some embodiments, the electrode assembly is wound so that both ends of the electrode assembly in the length direction are arc-shaped portions, and the arc shapes of the first reinforcement portion and the second reinforcement portion are both adapted to the curvature of the arc-shaped portion.

[0046] The electrode assembly is wound to form an arc-shaped portion at both ends of the electrode assembly along the length direction. The arc-shaped portions at both ends of the electrode assembly can better match the arcs of the first reinforcement portion and the second reinforcement portion. When the end of the electrode assembly extends into the accommodating groove formed by the first reinforcement portion and the second reinforcement portion, the surface of the electrode assembly will not be damaged.

[0047] In some embodiments, the side wall is further provided with a second reinforcement member, the second reinforcement member is arranged at an interval with the first reinforcement member, and the second reinforcement member is used to enhance the strength of the shell.

[0048] By providing the second reinforcement member, the side wall of the shell can be coordinated with the first reinforcement member to strengthen the shell as a whole, thereby preventing the shell from being deformed when the battery cells are assembled or grouped.

[0049] In some embodiments, the first reinforcement member is disposed on the first side wall; and the second reinforcement member is disposed on the second side wall.

[0050] The first reinforcement member is arranged on the first side wall to improve the pressure resistance of the shell along the thickness direction of the electrode assembly, and the second reinforcement member is arranged on the second side wall to improve the pressure resistance of the shell along the length direction of the electrode assembly. The first reinforcement member and the second reinforcement member cooperate to improve the overall pressure resistance of the shell.

[0051] In some embodiments, the second reinforcement member is protruding from the second side wall toward the inside of the accommodating cavity; or, the second reinforcement member is protruding from the second side wall toward the outside of the accommodating cavity.

[0052] The second reinforcement is flexibly formed. It can be protruded into the accommodating cavity to save battery space, or it can be protruded outside the accommodating cavity to increase the internal space of the battery cell so that the battery cell can withstand a higher internal pressure of the shell.

[0053] In some embodiments, the second reinforcement member is protruded into the accommodating cavity on the second side wall, and along the height direction of the electrode assembly, the second reinforcement member is higher than the electrode assembly.

[0054] By arranging a second reinforcement member to protrude into the accommodating cavity on the second side wall, the structural strength of the second side wall can be improved. At the same time, along the height direction of the electrode assembly, the second reinforcement member is arranged higher than the electrode assembly, which can limit the shaking of the electrode assembly along its height direction in the shell and avoid damage to the electrode ear or adapter.

[0055] In some embodiments, the second reinforcement member is extended along the length direction of the electrode assembly.

[0056] By arranging the second reinforcement member to extend along the length direction of the electrode assembly, the second reinforcement member can achieve overall reinforcement of the second side wall and avoid local deformation of the second side wall.

[0057] In some embodiments, the second reinforcement member is protruding outward from the accommodating cavity on the second side wall, and the second reinforcement member is formed with a stabilizing groove, which is used to stabilize the auxiliary member.

[0058] The second reinforcement member is protruding outward from the accommodating groove on the second side wall, which can increase the internal space of the battery cell so that the battery cell can withstand higher internal pressure. At the same time, a stabilizing groove can be formed between multiple spaced-apart second reinforcement members, which can be used to accommodate auxiliary parts to facilitate the positioning and installation of the auxiliary parts. The auxiliary parts can be some thermal management components inside the battery, such as: insulation pads, liquid cooling plates, heat conductive parts, etc.

[0059] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any one of the above embodiments.

[0060] In some embodiments, the first reinforcement member is disposed on the first side wall, and the second side wall is provided with a second reinforcement member for enhancing the strength of the battery cell.

[0061] By arranging the first reinforcement member on the first side wall and the second reinforcement member on the second side wall, the rigidity of the battery cell shell can be enhanced, thereby avoiding shell deformation during the production process of the battery cell, which causes assembly difficulties.

[0062] In some embodiments, the second reinforcement member is protruding outward from the accommodating cavity on the second side wall, and the second reinforcement member forms a stabilizing groove; the battery includes multiple battery cells, an auxiliary member is arranged between any two adjacent battery cells, and the auxiliary member at least partially extends into the stabilizing groove.

[0063] Multiple second reinforcements can be arranged at intervals on the second side wall. The second reinforcements can be extended along the length or height direction of the electrode assembly. The multiple second reinforcements are protruding out of the accommodating cavity on the second side wall, and the space defined between the multiple second reinforcements forms a stabilizing groove.

[0064] The battery includes multiple battery cells, and auxiliary parts are arranged between any two adjacent battery cells. The auxiliary parts can be thermal management components inside the battery, such as: thermal insulation pads, thermal conductive parts, liquid cooling plates, etc. The auxiliary parts are partially arranged in the stabilizing groove, which is convenient for the fixed installation of the auxiliary parts and can improve the space utilization inside the battery.

[0065] In some embodiments, the second reinforcement is protruding outward from the accommodating cavity on the second side wall; the battery includes multiple battery cells, an auxiliary component is arranged between any two adjacent battery cells, the auxiliary component forms a third accommodating groove, and the third accommodating groove is plugged into and matched with the second reinforcement.

[0066] A plurality of second reinforcement members are arranged on the second side wall. The second reinforcement members are arranged to protrude outward from the accommodating cavity on the second side wall. Meanwhile, third accommodating grooves are formed on the auxiliary members in a one-to-one correspondence. The third accommodating grooves are plugged into and matched with the second reinforcement members, which can reduce the difficulty of fixing and installing the auxiliary members, save the internal space of the battery, and improve the energy density of the battery.

[0067] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery provided by any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0069] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0070] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0071] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0072] Figure 4 A schematic diagram of the structure of a battery housing provided in some embodiments of the present application;

[0073] Figure 5 for Figure 4 A top view of the battery housing shown;

[0074] Figure 6 for Figure 4 A cross-sectional view of the battery housing shown;

[0075] Figure 7 A schematic diagram of the electrode assembly and battery housing provided in some embodiments of the present application;

[0076] Figure 8 A schematic diagram of another structure of a battery housing and an electrode assembly in cooperation with each other provided in some embodiments of the present application;

[0077] Fig. 9 Another schematic diagram of a battery casing structure provided for some embodiments of the present application.

[0078] Icons: vehicle 1000, motor 300, controller 200, battery 100, case 10, upper case 11, lower case 12, battery cell 20, shell 21, accommodating chamber 211, electrode assembly 22, first reinforcement 23, side wall 2112, accommodating groove 231, first side wall 2113, arc portion 221, first electrode assembly 222, second electrode assembly 223, first accommodating groove 2311, second accommodating groove 2312, first reinforcement portion 232, second reinforcement portion 233, third reinforcement portion 234, recessed groove 24, second reinforcement 25, second side wall 2114, third side wall 2115, fourth side wall 2116, stabilizing groove 26, third accommodating groove 2313, pole ear 27, adapter plate 28, pole post 29, auxiliary part 30. DETAILED DESCRIPTION

[0079] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0081] In the description of the embodiments of the present application, the technical terms "first", "second", 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 application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0082] 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 application. 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.

[0083] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0084] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0085] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0086] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0087] In the description of the embodiments of the present application, 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 be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0088] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0089] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0090] A power battery generally includes a box and multiple battery cells arranged in the box. The multiple battery cells can be in various states in the box. Multiple battery cells can be connected in series, parallel or mixed to form a battery module, and then multiple battery modules are connected in series, parallel or mixed to form a whole and accommodated in the box. It can also be a form without a battery module, where multiple battery cells are directly connected in series, parallel or mixed to be accommodated in the box.

[0091] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 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 collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The material of the separator can be PP (polypropylene) or

[0092] PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a laminated structure.

[0093] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0094] Generally speaking, a battery cell also includes a shell, and the electrode assembly is installed in the accommodating space of the shell. There is a gap between the battery cell and the inner wall of the shell in the length and width directions. During the vibration and impact of the electrode assembly, the electrode assembly is prone to high-amplitude shaking inside the shell, and the movement of the electrode assembly can easily break the pole ear or adapter, causing the battery to short-circuit.

[0095] In view of this, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly and a first reinforcement. The shell has a receiving cavity; the electrode assembly is arranged in the receiving cavity; the first reinforcement is arranged on the shell, which is used to strengthen the shell strength and to limit the relative movement of the electrode assembly to the shell. By providing the first reinforcement, the problem of breaking the tab or adapter caused by the shaking of the electrode assembly in the shell is reduced, and the reliability of the battery cell and the electrode assembly is improved.

[0096] The embodiment of the present application provides an electric device that uses a battery as a power source. 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, a vehicle, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. The electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric devices.

[0097] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0098] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000; the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 may be used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0099] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0100] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The first part 11 can be a hollow structure with one end open, and the second part 12 can be a plate-like structure, and the second part 12 covers the open side of the first part 11, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. The box 10 formed by the first part 11 and the second part 12 can be a variety of shapes, such as a cylinder, a cuboid, etc. The first part 11 and the second part 12 can be sealed by a sealing element, and the sealing element can be a sealing ring, a sealant, etc.

[0101] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery 100 module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 10.

[0102] In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include a busbar component for realizing electrical connection between multiple battery cells 20. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0103] According to some embodiments of this application, please refer to Figure 3 , Figure 3 Schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes: a shell 21, an electrode assembly 22 and a first reinforcement member 23. The shell 21 has a receiving cavity 211; the electrode assembly 22 is arranged in the receiving cavity 211. The first reinforcement member 23 is arranged on the shell 21, and is used to strengthen the strength of the shell 21 and to limit the movement of the electrode assembly 22 relative to the shell 21.

[0104] The shell 21 has a accommodating cavity 211, which can be used to accommodate the electrode assembly 22, electrolyte and other components. The number of electrode assemblies 22 inside the shell 21 can be one or more. According to some embodiments of the present application, the number of electrode assemblies 22 inside the shell 21 is two, and the two electrode assemblies 22 are arranged in parallel and stacked.

[0105] The electrode assembly 22 includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet. The electrode assembly 22 can be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or the electrode assembly 22 can also be a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 27. Each electrode assembly 22 is correspondingly provided with two pole ears 27 with opposite polarities, which are a positive pole ear and a negative pole ear respectively. The positive pole ear and the negative pole ear can be located on the same side or opposite sides of the electrode assembly 22. Figure 3 , the case where the positive electrode tab and the negative electrode tab are located on the same side of the main body is exemplarily shown.

[0106] There is a gap between the electrode assembly 22 and the inner wall of the shell 21 in the length and width directions of the battery cell 20 in the accommodating cavity 211 of the shell 21. The position movement of the electrode assembly 22 is easy to break the pole ear 27 or the adapter 28, causing the electrode assembly 22 to be short-circuited, affecting the reliability of the battery 100. In order to reduce the problem of the pole ear 27 or the adapter 28 breaking caused by the displacement of the electrode assembly 22, a first reinforcement member 23 can be provided on the side wall of the shell 21 of the battery cell 20. The first reinforcement member 23 can be integrally formed with the side wall of the shell 21, or can be separately connected to the side wall of the shell 21. The first reinforcement member 23 is located on the side of the electrode assembly 22 and is connected to the shell corresponding to the side. The abutment here may refer to that the size of the first reinforcement member 23 is equal to the size of the gap between the side of the electrode assembly 22 and the side wall of the shell 21, that is, when the electrode assembly 22 is in the initial installation position, the first reinforcement member 23 and the electrode assembly 22 are at least partially in contact and fit. Alternatively, the abutment here may also refer to that the size of the first limiting member may be slightly smaller than the size of the gap between the side of the electrode assembly 22 and the side wall of the shell 21, so as to facilitate the assembly of the battery cell 20, and even if the electrode assembly 22 shakes under this size condition, it will not cause the main body of the electrode assembly 22 to break the pole ear 27 or the adapter sheet 28.

[0107] The first reinforcement member 23 refers to a component provided on the shell 21 and capable of increasing the structural rigidity of the shell 21. The material of the first reinforcement member 23 may be consistent with or inconsistent with the material of the shell 21. The cross-sectional shape of the first reinforcement member 23 may be, but is not limited to, a polygon, a semicircle, a trapezoid or other irregular shapes. The first reinforcement member 23 may be fixed to the shell 21 in a combined manner or in an integrally formed manner. The combined manner may be bolt connection, clamping, riveting, welding, etc., and the integrally formed manner may be die-casting, casting, extrusion, or other processes.

[0108] By arranging the first reinforcement 23 on the shell 21, the first reinforcement 23 can abut between the side of the electrode assembly 22 and the corresponding side wall of the shell 21, so as to limit the movement of the electrode assembly 22 relative to the shell 21 and reduce the shaking of the electrode assembly 22 in the shell 21, that is, it can reduce the risk of the pole ear 27 or the adapter plate 28 being broken due to the shaking of the electrode assembly 22 pulling the pole ear 27 and the adapter plate 28, thereby reducing the occurrence of short circuit in the main body of the electrode assembly 22. The first reinforcement 23 arranged inside the shell 21 can also play a role in strengthening the shell 21 to a certain extent, thereby improving the reliability of the battery cell 20.

[0109] According to some embodiments of the present application, see Figure 4 , Figure 4A schematic diagram of a battery shell 21 provided for some embodiments of the present application, the shell 21 includes a side wall 2112 that forms a accommodating cavity 211, specifically a first side wall 2113, a second side wall 2113, a third side wall 2115 and a fourth side wall 2116, the two first side walls 2113 are opposite to and spaced apart along the length direction of the electrode assembly 22, the two second side walls 2114 are opposite to and spaced apart between the two first side walls 2113 along the thickness direction of the electrode assembly 22, the two first side walls 2113 and the two second side walls 2114 are enclosed to form an annular structure with openings at both ends, and the third side wall 2115 and the fourth side wall 2116 respectively close the two openings.

[0110] The first reinforcement 23 at least partially protrudes from the side wall 2112, which means that the first reinforcement 23 protrudes into the accommodating cavity 211 from any one of the first side wall 2113, the second side wall 2114, the third side wall 2115, and the fourth side wall 2116. Exemplarily, the first reinforcement 23 is arranged on the first side wall 2113. The first reinforcement 23 has a variety of molding methods, such as: die-casting, stamping, extrusion, etc. The first reinforcement 23 is integrally formed with the side wall 2112 of the shell 21 without reducing or destroying the structure of the shell 21.

[0111] Such a design is conducive to simplifying the molding process of the first reinforcement member 23 and improving the processing efficiency of the shell 21 . At the same time, the weight of the shell 21 will not be increased while the strength of the shell 21 is improved.

[0112] In some embodiments, Figure 5 and Figure 7 , which is a schematic diagram of a housing provided in some embodiments of the present application, Figure 7 This is a schematic diagram of the cooperation between a battery housing and an electrode assembly provided in some embodiments of the present application. The first reinforcement member 23 is formed with a receiving groove 231 , and at least a portion of the electrode assembly 22 extends into the receiving groove 231 .

[0113] The first reinforcement member 23 is formed with a receiving groove 231 . The receiving groove 231 can be formed in a variety of ways, such as one-piece forming by die casting, stamping, extrusion, etc., or can be processed by excavation solutions such as turning and milling.

[0114] By providing the receiving groove 231 on the first reinforcement 23 , the electrode assembly 22 at least partially extends into the receiving groove 231 , which can limit the movement of the electrode assembly 22 relative to the shell 21 , and at the same time can increase the space of the shell 21 and improve the energy density of the battery cell 20 .

[0115] In some embodiments, Figure 5 and Figure 7As shown, the side wall 2112 includes two first side walls 2112 arranged on both sides along the length direction of the electrode assembly 22 , at least one first side wall 2112 is provided with a first reinforcement 23 , and one end of the electrode assembly 22 in the length direction extends into the accommodating groove 231 .

[0116] Since there is a gap between the electrode assembly 22 and the inner wall of the shell 21 along the length and thickness directions of the electrode assembly 22, by setting the first reinforcement 23 on the first side wall 2112 in the length direction of the electrode assembly 22, one end of the electrode assembly 22 in the length direction extends into the accommodating groove 231, which can limit the shaking of the electrode assembly 22 in the accommodating cavity 211 along the length and thickness directions of the electrode assembly 22. At the same time, the first reinforcement 23 is set on the first side wall 2112, which can reduce the space occupied inside the shell 21, which is beneficial to improve the energy density of the battery cell 20.

[0117] According to some embodiments of the present application, Figure 5 and Figure 7 As shown, each first side wall 2112 is provided with a first reinforcement member 23 , and two receiving grooves 231 of the two first reinforcement members 23 are spaced apart and arranged opposite to each other along the length direction of the electrode assembly 22 , and both ends of the electrode assembly 22 extend into the receiving grooves 231 respectively.

[0118] By providing the first reinforcement members 23 on both first side walls 2112, both ends of the electrode assembly 22 along the length direction extend into the accommodating groove 231, which can better limit the position of the electrode assembly 22 in the shell 21 and limit the shaking of the electrode assembly 22 along its length direction.

[0119] According to some embodiments of the present application, Figure 5 and Figure 7 As shown, the receiving groove 231 is an arc-shaped groove.

[0120] By setting the accommodating groove 231 as an arc-shaped groove, the contact area between the end of the electrode assembly 22 and the groove wall can be increased, and the end of the electrode assembly 22 can be inserted into the arc-shaped groove more smoothly to avoid damage to the electrode assembly 22.

[0121] In some embodiments, Figure 7 As shown, the electrode assembly 22 is wound so that both ends of the electrode assembly 22 in the length direction are arc-shaped portions 221; when the number of the accommodating grooves 231 is one, the arc-shaped portion 221 adjacent to the arc-shaped groove extends into the corresponding arc-shaped groove; when the number of the accommodating grooves 231 is two, the two arc-shaped portions 221 extend into the corresponding arc-shaped grooves respectively.

[0122] In the present application, the electrode assembly 22 is wound, and arcuate portions 221 are formed at both ends of the length direction of the electrode assembly 22, which can be adapted to the arcuate groove, and the curved surface and the curved surface contact electrode assembly 22 can better fit the groove wall of the arcuate groove. When the first reinforcement 23 is set on a first side wall 2112, the arcuate portion 221 at one end of the electrode assembly 22 extends into the adjacent arcuate groove; when the first reinforcement 23 is respectively set on the two first side walls 2112, the arcuate portions 221 at both ends of the electrode assembly 22 extend into the corresponding arcuate grooves respectively.

[0123] By designing both ends of the electrode assembly 22 in the length direction to be arc-shaped portions 221 , they can match the arc-shaped groove, thereby achieving a better limiting effect on the electrode assembly 22 and facilitating the insertion of the electrode assembly 22 into the shell.

[0124] In some embodiments, Figure 7 As shown, the radius of the arc groove is R1, the radius of the arc portion 221 is R2, and the distance between the inner walls on both sides of the shell 21 in the width direction is W1, satisfying R2<R1≤W1 / 2.

[0125] By setting the radius of the arc-shaped groove to be larger than the radius of the arc-shaped portion 221 and smaller than or equal to one-half of the distance between the inner walls of the two opposite sides in the width direction of the shell 21, when the electrode assembly 22 is assembled into the shell, it will not interfere with the first reinforcement 23, thus avoiding scratches and damage to the electrode assembly 22. At the same time, the relative movement of the electrode assembly 22 to the shell 21 can be better restricted to avoid damage to the tab 27 or the adapter 28.

[0126] In some embodiments, Figure 7 As shown, the radius of the arc groove is R1, the radius of the arc portion 221 is R2, and the distance between the inner walls on both sides of the shell 21 in the width direction is W1, satisfying R2<R1≤W1 / 4.

[0127] When the number of electrode assemblies 22 accommodated is two, by setting the radius of the arc-shaped groove to be larger than the radius of the arc-shaped portion 221 and less than or equal to one-fourth of the distance between the inner walls of the two opposite sides in the width direction of the shell 21, two arc-shaped grooves can be set on the same first reinforcement 23, so that the arc-shaped portions 221 of the two electrode assemblies 22 extend into the corresponding arc-shaped grooves respectively, and when the electrode assembly 22 is assembled into the shell, it will not interfere with the first reinforcement 23, avoiding scratches and damage to the electrode assembly 22. At the same time, it can better limit the movement of the electrode assembly 22 relative to the shell 21 to avoid damage to the pole ear 27 or the adapter 28. At the same time, the provision of two electrode assemblies 22 can also improve the energy density of the battery cell 20.

[0128] In some embodiments, the number of the first reinforcement members 23 is one or more. When the number of the first reinforcement members 23 is one, the first reinforcement member 23 is extended and arranged along the height direction of the electrode assembly 22. When the number of the first reinforcement members 23 is multiple, multiple first reinforcement members 23 are arranged at intervals along the height direction of the electrode assembly 22.

[0129] When there is one first reinforcement member 23, the first reinforcement member 23 is extended and arranged along the height direction of the electrode assembly 22, which can strengthen the side wall 2112 of the shell 21 as a whole and improve the deformation resistance of the shell 21; when there are multiple first reinforcement members 23, multiple first reinforcement members 23 are arranged at intervals along the height direction of the electrode assembly 22, which can limit the movement of the electrode assembly 22 relative to the shell 21 while reducing the space occupied by the first reinforcement member 23 inside the shell 21, thereby improving the energy density of the battery cell 20.

[0130] In some embodiments, Figure 6 As shown, the extension length of the first reinforcement 23 along the height direction of the electrode assembly 22 is (H2), and the height of the shell 21 is (H1), satisfying 0.1≤H2 / H1<1.

[0131] The extension length of the first reinforcement 23 will affect the number of first reinforcements 23 arranged on the side wall 2112. Reasonable control of the extension length of the first reinforcement 23 can effectively reinforce the side wall 2112 of the shell 21, while avoiding structural interference caused by the first reinforcement 23 being too long, which is beneficial to molding processing.

[0132] In some embodiments, the relationship between the extension length (H2) of the first reinforcement 23 along the height direction of the electrode assembly 22 and the height (H1) of the shell 21 satisfies 0.5≤H2 / H1<1.

[0133] The extension length of the first reinforcement member 23 is reasonably controlled. A first reinforcement member 23 is provided on a side wall 2112 . The structural strength of the shell 21 of the battery 100 is improved and the structural deformation of the shell 21 is reduced while ensuring a reasonable manufacturing cost.

[0134] In some embodiments, Figure 7 As shown, the battery cell 20 includes a plurality of electrode assemblies 22 , which are arranged in parallel and stacked, and the first reinforcement 23 is formed with a plurality of accommodating grooves 231 that match the number of the plurality of electrode assemblies 22 and correspond one to one, and each electrode assembly 22 extends into a corresponding accommodating groove 231 .

[0135] By providing a plurality of electrode assemblies 22, the energy density of the battery cell 20 can be improved. The first reinforcement 23 is formed with a plurality of accommodating grooves 231 that match the number of the plurality of electrode assemblies 22 and correspond one to one. Each electrode assembly 22 extends into a corresponding accommodating groove 231, respectively, and the movement of each electrode assembly 22 relative to the shell 21 can be respectively limited to prevent the electrode assembly 22 from shaking and damaging the tab 27 or the adapter 28, thereby improving the reliability of the battery cell 20.

[0136] In some embodiments, the number of electrode assemblies 22 is two, which are respectively a first electrode assembly 22 and a second electrode assembly 22. The accommodating groove 231 includes a first accommodating groove 231 and a second accommodating groove 231 arranged along the thickness direction of the electrode assembly 22. The end of the first electrode assembly 22 extends into the first accommodating groove 231, and the end of the second electrode assembly 22 extends into the second accommodating groove 231.

[0137] The first electrode assembly 22 and the second electrode assembly 22 are arranged in parallel and stacked, and the first reinforcement member 23 is provided with a first accommodating groove 231 and a second accommodating groove 231 correspondingly along the thickness direction of the electrode assembly 22. The first electrode assembly 22 and the second electrode assembly 22 extend into the corresponding accommodating groove 231 respectively, and the first electrode assembly 22 and the second electrode assembly 22 can be restricted in the corresponding accommodating groove 231 to prevent the first electrode assembly 22 and the second electrode assembly 22 from moving relative to the shell 21.

[0138] In some embodiments, the first reinforcement member 23 is disposed on the two end side walls 2112 along the length direction of the electrode assembly 22, and the two ends of the first electrode assembly 22 respectively extend into the corresponding first receiving groove 231, and the two ends of the second electrode assembly 22 respectively extend into the corresponding second receiving groove 231.

[0139] The first reinforcement member 23 is arranged on the side walls 2112 at both ends along the length direction of the electrode assembly 22, which can improve the deformation resistance of the shell 21. At the same time, both ends of the first electrode assembly 22 are accommodated in the first accommodating groove 231 and both ends of the second electrode assembly 22 are accommodated in the second accommodating groove 231. Both ends of the electrode assembly 22 along the length direction can be restricted in the accommodating groove 231, realizing the overall positioning of the electrode assembly 22, avoiding the first electrode assembly 22 and the second electrode assembly 22 from shaking along their own length direction, resulting in damage to the pole ear 27 or breakage of the adapter sheet 28.

[0140] In some embodiments, Figure 7As shown, the first reinforcement member 23 includes a first reinforcement portion 232 and a second reinforcement portion 233, the first reinforcement portion 232 forms a first receiving groove 231, and the second reinforcement portion 233 forms a second receiving groove 231; or, the first reinforcement member 23 includes a first reinforcement portion 232, a second reinforcement portion 233 and a third reinforcement portion 234, the first reinforcement portion 232 forms a first receiving groove 231, the second reinforcement portion 233 forms a second receiving groove 231, and the third reinforcement portion 234 connects the first reinforcement portion 232 and the second reinforcement portion 233.

[0141] The first reinforcement 23 includes a first reinforcement portion 232 and a second reinforcement portion 233, wherein the first reinforcement portion 232 forms a first accommodating groove 231 for limiting the shaking of the first electrode assembly 22, and the second reinforcement portion 233 forms a second accommodating groove 231 for limiting the shaking of the second electrode assembly 22; or, the first reinforcement 23 also includes a third reinforcement portion 234, which is used to connect the first reinforcement portion 232 and the second reinforcement portion 233, thereby improving the anti-extrusion deformation ability of the first reinforcement 23 and reducing the risk of the first reinforcement portion 232 and the second reinforcement portion 233 squeezing the electrode assembly 22.

[0142] In some embodiments, Figure 7 As shown, a recessed groove 24 is formed between the ends of any two adjacent electrode assemblies 22 among the plurality of electrode assemblies 22 , and the first reinforcement member 23 at least partially extends into the recessed groove 24 .

[0143] A recessed groove 24 is formed between the ends of any two adjacent electrode assemblies 22 among the multiple electrode assemblies 22. The third reinforcing portion 234 of the first reinforcing member 23 can at least partially extend into the recessed groove 24. The third reinforcing portion 234 cooperates with the first accommodating groove 231 and the second accommodating groove 231, respectively, and can respectively limit the movement of the first electrode assembly 22 and the second electrode assembly 22 relative to the shell 21, thereby improving the overall position stability of the electrode assembly 22.

[0144] In some embodiments, the portion of the first reinforcement member 23 extending into the recessed groove 24 is in contact with a portion of the groove wall surface of the recessed groove 24 .

[0145] The third reinforcing portion 234 of the first reinforcing member 23 extends into the concave groove 24 and fits with part of the groove wall surface of the concave groove 24, that is, the third reinforcing portion 234 fits with part of the end surface of the electrode assembly 22, thereby tightly confining the electrode assembly 22 in the receiving groove 231 to prevent the electrode assembly 22 from shaking. At the same time, there is a gap between the third reinforcing portion 234 and the bottom of the concave groove 24, so that the electrolyte can flow better during injection, and the electrolyte at the bottom of the battery 100 shell 21 can flow back through the gap, which can improve the infiltration effect on the electrode assembly 22 and help improve the injection efficiency.

[0146] In some embodiments, Figure 8 As shown, Figure 8 A schematic diagram of another shell 21 provided for some embodiments of the present application, the first reinforcement member 23 includes a first reinforcement portion 232 and a second reinforcement portion 233 spaced apart along the thickness direction of the electrode assembly 22, the first reinforcement portion 232 and the second reinforcement portion 233 spaced apart, and a receiving groove 231 is formed therebetween.

[0147] The first reinforcement part 232 and the second reinforcement part 233 are arranged at intervals along the thickness direction of the electrode assembly 22, and the space defined between the two is the receiving groove 231 for receiving the end of the electrode assembly 22. The first reinforcement part 232 and the second reinforcement part 233 are arranged at intervals, and the molding process of the first reinforcement 23 is simpler, and less space is occupied inside the shell 21, which is conducive to improving the volume energy density of the battery cell 20.

[0148] In some embodiments, the sides of the first reinforcing portion 232 and the second reinforcing portion 233 that are close to each other are both arc-shaped.

[0149] The space defined by the side where the first reinforcement portion 232 and the second reinforcement portion 233 are close to each other is used to accommodate the end of the electrode assembly 22. The side where the first reinforcement portion 232 and the second reinforcement portion 233 are close to each other are both arc-shaped, which can better fit the end of the electrode assembly 22 and avoid interference between the end of the electrode assembly 22 and the first reinforcement portion 232 and the second reinforcement portion 233, thereby avoiding damage to the electrode assembly 22.

[0150] In some embodiments, the electrode assembly 22 is wound so that both ends of the electrode assembly 22 in the length direction are arc-shaped portions 221 , and the arc shapes of the first reinforcement portion 232 and the second reinforcement portion 233 are adapted to the curvature of the arc-shaped portion 221 .

[0151] The electrode assembly 22 is wound to form an arc portion 221 at both ends of the electrode assembly 22 along the length direction. The arc portions 221 at both ends of the electrode assembly 22 can better match the arcs of the first reinforcement portion 232 and the second reinforcement portion 233. When the end of the electrode assembly 22 extends into the accommodating groove 231 formed by the first reinforcement portion 232 and the second reinforcement portion 233, the surface of the electrode assembly 22 will not be damaged.

[0152] In some embodiments, Figure 3 and Figure 4 As shown, the side wall 2112 is further provided with a second reinforcement member 25 , which is arranged at an interval from the first reinforcement member 23 , and is used to strengthen the strength of the shell 21 .

[0153] The first reinforcement 23 can be arranged on any one of the first side wall 2113, the second side wall 2114, the third side wall 2115, and the fourth side wall 2116. The second reinforcement 25 can be arranged on any one of the first side wall 2113, the second side wall 2114, the third side wall 2115, and the fourth side wall 2116. When the second reinforcement 25 and the first reinforcement 23 are arranged on the same side wall 2112, the second reinforcement 25 and the first reinforcement 23 are arranged at intervals. When the second reinforcement 25 and the first reinforcement 23 are arranged on different side walls 2112, there can be multiple second reinforcements 25, and multiple second reinforcements 25 are arranged at intervals. Exemplarily, the second reinforcement 25 is arranged on the second side wall 2114. By arranging the second reinforcement 25, it can cooperate with the first reinforcement 23 to strengthen the side wall 2112 of the shell 21 as a whole, so as to avoid deformation of the shell 21 when the battery cells 20 are assembled or grouped.

[0154] In some embodiments, the first reinforcement member 23 is disposed on the first side wall 2113 ; the second reinforcement member 25 is disposed on the second side wall 2114 .

[0155] By arranging the first reinforcement 23 on the first side wall 2113, the compressive strength of the shell 21 along the thickness direction of the electrode assembly 22 can be improved, and the second reinforcement 25 is arranged on the second side wall 2114 to improve the compressive strength of the shell 21 along the length direction of the electrode assembly 22. The first reinforcement 23 and the second reinforcement 25 cooperate to improve the overall compressive strength of the shell 21.

[0156] In some embodiments, the second reinforcement member 25 is provided on the second side wall 2114 to protrude inwardly from the accommodating cavity 211 ; alternatively, the second reinforcement member 25 is provided on the second side wall 2114 to protrude outwardly from the accommodating cavity 211 .

[0157] The second reinforcement 25 can be flexibly formed. It can be protruded into the accommodating cavity 211 to save space in the battery 100 , or it can be protruded out of the accommodating cavity 211 to increase the internal space of the battery cell 20 so that the battery cell 20 can withstand a higher internal pressure of the shell 21 .

[0158] In some embodiments, the second reinforcement member 25 is protruded into the accommodating cavity 211 on the second side wall 2114 , and along the height direction of the electrode assembly 22 , the second reinforcement member 25 is higher than the electrode assembly 22 .

[0159] By arranging the second reinforcement 25 to protrude from the second side wall 2114 into the accommodating cavity 211, the structural strength of the second side wall 2114 can be improved. At the same time, along the height direction of the electrode assembly 22, the second reinforcement 25 is arranged higher than the electrode assembly 22, which can limit the shaking of the electrode assembly 22 along its height direction in the shell 21 to avoid damage to the pole ear 27 or the adapter plate 28.

[0160] In some embodiments, the second reinforcement member 25 is extended along the length direction of the electrode assembly 22 .

[0161] By arranging the second reinforcement member 25 to extend along the length direction of the electrode assembly 22 , the second reinforcement member 25 can achieve overall reinforcement of the second side wall 2114 and avoid local deformation of the second side wall 2114 .

[0162] In some embodiments, Fig. 9 As shown, the second reinforcement member 25 is protruding outward from the accommodating cavity 211 on the second side wall 2114 , and the second reinforcement member 25 is formed with a stabilizing groove 26 , which is used to stabilize the auxiliary member 30 .

[0163] The second reinforcement 25 is protruding outward from the accommodating groove 231 on the second side wall 2114, which can increase the internal space of the battery cell 20 so that the battery cell 20 can withstand a higher internal pressure. At the same time, a stabilizing groove 26 can be formed between a plurality of spaced-apart second reinforcements 25. The stabilizing groove 26 can be used to accommodate auxiliary parts 30 to facilitate the positioning and installation of the auxiliary parts 30. The auxiliary parts 30 include: thermal insulation pads, liquid cooling plates, heat conductive parts, etc.

[0164] An embodiment of the present application provides a battery 100, comprising a battery cell 20 provided in any one of the above embodiments.

[0165] In some embodiments, the side wall 2112 includes two first side walls 2113, two second side walls 2114, a third side wall 2115, and a fourth side wall 2116. The two first side walls 2113 are opposite to each other and spaced apart along the length direction of the electrode assembly 22, and the two second side walls 2114 are opposite to each other and spaced apart along the thickness direction of the electrode assembly 22 between the two first side walls 2113; the two first side walls 2113 and the two second side walls 2114 are enclosed to form an annular structure with openings at both ends; the third side wall 2115 and the fourth side wall 2116 respectively close the two openings; the first reinforcement 23 is arranged on the first side wall 2113, and the second side wall 2114 is provided with a second reinforcement 25 for strengthening the strength of the battery cell 20.

[0166] By arranging the first reinforcement 23 on the first side wall 2113 and the second reinforcement 25 on the second side wall 2114 , the rigidity of the shell 21 of the battery cell 20 can be enhanced to avoid deformation of the shell 21 during the production process of the battery cell 20 , which would cause assembly difficulties.

[0167] In some embodiments, the second reinforcement 25 is protruding outward from the accommodating cavity 211 on the second side wall 2114, and the second reinforcement 25 forms a stabilizing groove 26; the battery 100 includes a plurality of battery cells 20, and an auxiliary component 30 is arranged between any two adjacent battery cells 20, and the auxiliary component 30 at least partially extends into the stabilizing groove 26.

[0168] The second side wall 2114 may be provided with a plurality of second reinforcement members 25 at intervals. The second reinforcement members 25 may be extended along the length or height direction of the electrode assembly 22 . The plurality of second reinforcement members 25 may protrude outward from the accommodating cavity 211 on the second side wall 2114 . The space defined between the plurality of second reinforcement members 25 may form a stabilizing groove 26 .

[0169] The battery 100 includes a plurality of battery cells 20, and an auxiliary component 30 is disposed between any two adjacent battery cells 20. The auxiliary component 30 may be a heat insulating pad, a heat conducting component, a liquid cooling plate, etc. The auxiliary component 30 is partially disposed in the stabilizing groove 26, which facilitates the fixed installation of the auxiliary component 30 and improves the space utilization rate inside the battery 100.

[0170] In some embodiments, Figure 4 As shown, the second reinforcement member 25 is protruding outward from the accommodating cavity 211 and is arranged on the second side wall 2114; the battery 100 includes a plurality of battery cells 20, and an auxiliary member 30 is arranged between any two adjacent battery cells 20, and the auxiliary member 30 forms a third accommodating groove 2313, and the third accommodating groove 2313 is plugged into and matched with the second reinforcement member 25.

[0171] A plurality of second reinforcement members 25 may be provided on the second side wall 2114. The second reinforcement members 25 are provided to protrude outward from the accommodating cavity 211 on the second side wall 2114. At the same time, a plurality of third accommodating grooves 2313 are formed one by one on the auxiliary member 30. The third accommodating grooves 2313 and the second reinforcement members 25 are plugged into and matched with each other, which can reduce the difficulty of fixing and installing the auxiliary member 30, and can also save the internal space of the battery 100 and improve the energy density of the battery 100.

[0172] An embodiment of the present application provides an electrical device, comprising the battery 100 provided in any one of the above embodiments.

[0173] According to some embodiments of the present application, the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a first reinforcement 23 and a second reinforcement 25. The shell 21 includes two first side walls 2113 and two second side walls 2114, the two first side walls 2113 are opposite and spaced along the length direction of the electrode assembly 22, and the two second side walls 2114 are opposite and spaced between the two first side walls 2113 along the thickness direction of the electrode assembly 22. The electrode assembly 22 is wound and formed, and an arc portion 221 is formed at both ends, including a first electrode assembly 222 and a second electrode assembly 223. The first reinforcement 23 is arranged on the first side wall 2113, and the second reinforcement 25 is arranged on the second side wall 2114. The first reinforcement member 23 is formed to protrude into the accommodation cavity 211, and the first reinforcement member 23 includes a first reinforcement portion 232, a second reinforcement portion 233 and a third reinforcement portion 234. The first reinforcement portion 232 forms a first accommodation groove 2311, the second reinforcement portion 233 forms a second accommodation groove 2312, and the third reinforcement portion 234 connects the first reinforcement portion 232 and the second reinforcement portion 233. The first accommodation groove 2311 and the second accommodation groove 2312 are arranged at intervals along the thickness direction of the electrode assembly 22. The arc-shaped portions 221 at both ends of the first electrode assembly 222 extend into the first accommodation groove 2311, and the arc-shaped portions 221 at both ends of the second electrode assembly 223 extend into the second accommodation groove 2312. The second reinforcement member 25 is arranged to protrude out of the accommodation cavity 211, and a plurality of second reinforcement members 25 are arranged on the second side wall 2114. A plurality of third accommodation grooves 2313 are formed on the auxiliary member 30 in a one-to-one correspondence, and the second reinforcement member 25 is plugged into and matched with the third accommodation groove 2313.

[0174] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0175] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity; An electrode assembly is disposed in the accommodating cavity; The first reinforcement member is disposed on the shell to enhance the strength of the shell and to limit the movement of the electrode assembly relative to the shell.

2. The battery cell according to claim 1, characterized in that: The shell includes a side wall forming the accommodating cavity, and at least a portion of the first reinforcement member is protruded from the side wall.

3. The battery cell according to claim 2, characterized in that: The first reinforcement is formed with a receiving groove, and at least a portion of the electrode assembly extends into the receiving groove.

4. The battery cell according to claim 3, characterized in that: The side wall includes two first side walls arranged on both sides along the length direction of the electrode assembly, at least one of the first side walls is provided with the first reinforcement, and one end of the electrode assembly in the length direction extends into the accommodating groove.

5. The battery cell according to claim 4, characterized in that: Each of the first side walls is provided with the first reinforcement, and the two accommodating grooves of the two first reinforcements are spaced apart and arranged opposite to each other along the length direction of the electrode assembly, and two ends of the electrode assembly extend into the accommodating grooves respectively.

6. The battery cell according to claim 3, characterized in that: The accommodating groove is an arc-shaped groove.

7. The battery cell according to claim 6, characterized in that: The electrode assembly is wound so that both ends of the electrode assembly in the length direction are arc-shaped portions; When the number of the accommodating groove is one, the arc-shaped portion adjacent to the arc-shaped groove extends into the corresponding arc-shaped groove; When the number of the accommodating grooves is two, the two arc-shaped portions extend into the corresponding arc-shaped grooves respectively.

8. The battery cell according to claim 7, characterized in that: The radius of the arc-shaped groove is R1, the radius of the arc-shaped portion is R2, and the distance between the inner walls on both sides opposite to each other in the width direction of the shell is W1, satisfying R2<R1≤W1 / 2.

9. The battery cell according to claim 8, characterized in that: R2<R1≤W1 / 4.

10. The battery cell according to claim 2, characterized in that: The number of the first reinforcement members is one or more. When the number of the first reinforcement members is one, the first reinforcement members are extended and arranged along the height direction of the electrode assembly. When the number of the first reinforcement members is multiple, multiple first reinforcement members are arranged at intervals along the height direction of the electrode assembly.

11. The battery cell according to claim 10, characterized in that: An extension length of the first reinforcement along the height direction of the electrode assembly is H2, and a height of the shell is H1, satisfying 0.1≤H2 / H1<1.

12. The battery cell according to claim 11, characterized in that: 0.5≤H2 / H1<1.

13. The battery cell according to any one of claims 3 to 12, characterized in that: The battery cell includes a plurality of electrode assemblies, which are connected in parallel and stacked. The first reinforcement is formed with a plurality of accommodating grooves that match the number of the plurality of electrode assemblies and correspond one to one. Each electrode assembly extends into a corresponding accommodating groove.

14. The battery cell according to claim 13, characterized in that: The number of the electrode assemblies is two, which are respectively a first electrode assembly and a second electrode assembly. The accommodating groove includes a first accommodating groove and a second accommodating groove spaced apart along the thickness direction of the electrode assembly. The end of the first electrode assembly extends into the first accommodating groove, and the end of the second electrode assembly extends into the second accommodating groove.

15. The battery cell according to claim 14, characterized in that: The first reinforcement member is arranged on the side walls at both ends along the length direction of the electrode assembly, and the two ends of the first electrode assembly extend into the corresponding first accommodating grooves respectively, and the two ends of the second electrode assembly extend into the corresponding second accommodating grooves respectively.

16. The battery cell according to claim 15, characterized in that: The first reinforcement member includes a first reinforcement portion and a second reinforcement portion, the first reinforcement portion forms the first accommodating groove, and the second reinforcement portion forms the second accommodating groove; or, the first reinforcement member includes a first reinforcement portion, a second reinforcement portion and a third reinforcement portion, the first reinforcement portion forms the first accommodating groove, the second reinforcement portion forms the second accommodating groove, and the third reinforcement portion connects the first reinforcement portion and the second reinforcement portion.

17. The battery cell according to claim 13, characterized in that: A recessed groove is formed between ends of any two adjacent electrode assemblies among the plurality of electrode assemblies, and the first reinforcement member at least partially extends into the recessed groove.

18. The battery cell according to claim 17, characterized in that: The portion of the first reinforcement member extending into the recessed groove is in contact with the groove wall surface of the recessed groove.

19. The battery cell according to claim 3, characterized in that: The first reinforcement member includes a first reinforcement portion and a second reinforcement portion which are spaced apart along a thickness direction of the electrode assembly. The first reinforcement portion and the second reinforcement portion are spaced apart and the accommodation groove is formed therebetween.

20. The battery cell according to claim 19, characterized in that: The first reinforcing portion and the second reinforcing portion are both arc-shaped at sides close to each other.

21. The battery cell according to claim 20, characterized in that: The electrode assembly is wound and formed so that both ends of the electrode assembly in the length direction are arc-shaped portions, and the arc shapes of the first reinforcement portion and the second reinforcement portion are both adapted to the curvature of the arc-shaped portion.

22. The battery cell according to any one of claims 2 to 12, characterized in that: The side wall is further provided with a second reinforcement member, which is arranged at an interval from the first reinforcement member, and the second reinforcement member is used to enhance the strength of the shell.

23. The battery cell according to claim 22, characterized in that: The side walls of the shell include two first side walls, two second side walls, a third side wall and a fourth side wall, the two first side walls are opposite to each other and spaced apart along the length direction of the electrode assembly, and the two second side walls are opposite to each other and spaced apart between the two first side walls along the thickness direction of the electrode assembly; the two first side walls and the two second side walls are combined to form an annular structure with openings at both ends; the third side wall and the fourth side wall respectively close the two openings; the first reinforcement is arranged on any one of the first side wall, the second side wall, the third side wall and the fourth side wall, and the second reinforcement is arranged on any one of the first side wall, the second side wall, the third side wall and the fourth side wall.

24. The battery cell according to claim 23, characterized in that: The first reinforcement member is disposed on the first side wall; the second reinforcement member is disposed on the second side wall.

25. The battery cell according to claim 24, characterized in that: The second reinforcement member is protruding from the second side wall toward the inside of the accommodating cavity; or, the second reinforcement member is protruding from the second side wall toward the outside of the accommodating cavity.

26. The battery cell according to claim 25, characterized in that: The second reinforcement member is protruding from the second side wall toward the accommodating cavity, and along the height direction of the electrode assembly, the second reinforcement member is higher than the electrode assembly.

27. The battery cell according to claim 26, characterized in that: The second reinforcement is extended along the length direction of the electrode assembly.

28. The battery cell according to claim 23, characterized in that: The second reinforcement member is protruding outward from the accommodating cavity on the second side wall, and a stabilizing groove is formed on the second reinforcement member, and the stabilizing groove is used to stabilize the auxiliary member.

29. A battery, characterized in that: Comprising a battery cell as described in any one of claims 1-28.

30. The battery according to claim 29, characterized in that The side walls of the shell in the battery cell include two first side walls, two second side walls, a third side wall and a fourth side wall, the two first side walls are opposite to each other and spaced apart along the length direction of the electrode assembly, and the two second side walls are opposite to each other and spaced apart between the two first side walls along the thickness direction of the electrode assembly; the two first side walls and the two second side walls are enclosed to form an annular structure with openings at both ends; the third side wall and the fourth side wall respectively close the two openings; The first reinforcement member is disposed on the first side wall, and the second side wall is provided with a second reinforcement member for reinforcing the strength of the battery cell.

31. The battery according to claim 30, characterized in that The second reinforcement is protruding outward from the accommodating cavity on the second side wall, and the second reinforcement is formed with a stabilizing groove; the battery includes a plurality of battery cells, an auxiliary member is provided between any two adjacent battery cells, and at least part of the auxiliary member extends into the stabilizing groove.

32. The battery according to claim 30, characterized in that The second reinforcement member is disposed on the second side wall protruding outward from the accommodating cavity; The battery comprises a plurality of battery cells, an auxiliary component is arranged between any two adjacent battery cells, the auxiliary component is formed with a third receiving groove, and the third receiving groove is plug-fitted with the second reinforcement component.

33. An electrical device, characterized in that: Comprising a battery as claimed in claim 29.

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