Battery monomer, battery and electric device

Abstract

The power utilization device comprises a battery (100), and the battery (100) comprises a battery monomer (110). The battery monomer (110) comprises a shell (10) and an electrode assembly (12), the shell (10) is provided with a first shell wall (11) and a liquid injection hole (10a) formed in the first shell wall (11), the first shell wall (11) comprises a main body part (111) and mounting parts (112), the inner wall of each mounting part (112) is sunken to form a containing cavity (112a), at least one mounting part (112) is provided with the liquid injection hole (10a), and the liquid injection hole (10a) is communicated with the exterior of the shell (10) and the containing cavity (112a); the electrode assembly (12) is arranged in the shell (10); a flow guide channel (10b) is arranged between the main body part (111) and the electrode assembly (12), and the flow guide channel (10b) is communicated with the containing cavity (112a). The battery monomer (110) can guide at least part of the electrolyte accumulated in the accommodating cavity (112a) to other areas of the internal space of the shell (10) by arranging the additional flow guide channel (10b), so that the injection efficiency of the electrolyte is improved.

Description

Battery cell, battery and electric device TECHNICAL FIELD

[0001] The embodiments of the present disclosure relate to the technical field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0002] In the battery cell, an electrode assembly is arranged, and the electrode assembly needs to be infiltrated by electrolyte to realize electrochemical reaction with the electrolyte, so as to realize the charging and discharging function of the battery cell. Therefore, when the battery cell is produced and manufactured, electrolyte needs to be injected into the battery cell to infiltrate the electrode assembly.

[0003] In the related art, an injection hole is arranged on the shell of the battery cell, and electrolyte is injected into the inside of the battery cell through the injection hole.

[0004] However, in order to reduce the space occupied by the battery cell, the structure of the battery cell is more and more compact, and after the electrolyte passes through the injection hole, the injection flow of the electrolyte is limited by the blockage of the electrode assembly and the penetration rate of the electrolyte in the electrode assembly, which has an adverse effect on the injection efficiency of the electrolyte.

[0005] SUMMARY

[0006] Therefore, the embodiments of the present disclosure aim to provide a battery cell, a battery and an electric device capable of improving the electrolyte injection efficiency.

[0007] To achieve the above-mentioned purpose, the technical scheme of the embodiments of the present disclosure is as follows:

[0008] The embodiments of the present disclosure provide a battery cell, comprising:

[0009] a shell having a first shell wall and an injection hole arranged on the first shell wall, the first shell wall comprising a main body part and a mounting part, the inner wall of the mounting part being recessed to form a containing cavity, at least one of the mounting parts being provided with the injection hole, the injection hole being in communication with the outside of the shell and the containing cavity;

[0010] an electrode assembly arranged in the shell;

[0011] wherein the main body part and the electrode assembly have a flow guide channel in communication with the containing cavity.

[0012] The battery cell in the embodiments of the present disclosure can at least partially guide the electrolyte accumulated in the containing cavity to other regions of the internal space of the shell by setting an additional flow guide channel, thereby improving the penetration speed of the electrolyte in the electrode assembly, expanding the flow range of the electrolyte in the shell, reducing the probability of problems such as blocking of subsequent electrolyte into the shell and electrolyte overflow from the shell due to excessive accumulation of electrolyte in the containing cavity, improving the efficiency of electrolyte injection, being conducive to improving the flow of injected electrolyte, and improving the production efficiency of the battery cell.

[0013] In some embodiments, the surface of the main body part on the side facing the electrode assembly is provided with a first groove, the first groove is open on the side facing the electrode assembly, and the first groove forms at least part of the flow guide channel. In this way, the structure of the flow guide channel can be simplified, and the electrolyte can flow to other regions of the internal space of the shell under the guidance of the main body part, thereby simplifying the structure of the battery cell.

[0014] In some embodiments, the battery cell further comprises an insulating member located between the first shell wall and the electrode assembly, and at least part of the flow guide channel is located between the insulating member and the first shell wall. In this way, it is beneficial to simplify the structure of the flow guide channel, reduce the probability of changes in the cross section of the flow guide channel due to relative movement between the insulating member and the electrode assembly, and keep the cross section of the flow guide channel unchanged under different working conditions to meet the flow demand of the electrolyte.

[0015] And / or, at least part of the flow guide channel is located between the electrode assembly and the insulating member. In this way, it is beneficial to increase the contact area of the insulating member and the first shell wall, improve the insulation performance and installation stability of the insulating member, simplify the structure of the flow guide channel, reduce the probability of changes in the cross section of the flow guide channel due to relative movement between the insulating member and the first shell wall, and keep the cross section of the flow guide channel unchanged under different working conditions to meet the flow demand of the electrolyte.

[0016] In some embodiments, a part of the insulating member is spaced apart from the electrode assembly to form at least part of the flow guide channel. In this way, on the one hand, the space formed by the spacing between the two is used to form the flow guide channel, and on the other hand, the part abutting between the two is conducive to keeping the relative position of the two stable and reducing the adverse effects of deformation of the flow guide channel on the flow of electrolyte in the flow guide channel.

[0017] In some embodiments, the insulation member is provided with a second groove on a side thereof facing the electrode assembly, the second groove being open on a side thereof facing the electrode assembly, and the second groove forming at least part of the flow channel. In this way, the second groove is simple in structure and easy to manufacture, and is conducive to expanding the open area of the flow channel and facilitating the electrolyte in the flow channel to contact the electrode assembly more rapidly, thereby improving the efficiency of liquid injection.

[0018] In some embodiments, a portion of the insulation member is spaced apart from the main body portion in the first direction to form at least part of the flow channel. In this way, on the one hand, the space formed by the spacing between the two is used to form the flow channel, and on the other hand, the abutting portion between the two is conducive to maintaining the relative positions of the two stable and reducing the adverse effects of deformation of the flow channel on the flow of electrolyte in the flow channel.

[0019] In some embodiments, at least one of a surface of the main body portion facing a side of the insulation member and a surface of the insulation member facing a side of the main body portion is provided with a third groove, the third groove being open on a side thereof along the first direction, and the third groove forming at least part of the flow channel. In this way, the third groove can be machined to form its structure, which is simple and easy to manufacture.

[0020] In some embodiments, a portion of the main body portion protrudes in the first direction away from a side of the electrode assembly to form a first protruding portion, and the third groove is formed on the other side. In this way, it is conducive to increasing the cross-sectional area of the third groove to meet the flow requirements of the flow channel, and it is convenient to increase the thickness of the region of the main body portion where the third groove is provided to improve the structural strength of the main body portion.

[0021] In some embodiments, the insulation member is provided with a second protruding portion, the second protruding portion protruding in the first direction away from the electrode assembly and forming an accommodation space on the other side, at least part of the second protruding portion being arranged in the accommodation cavity, the third protruding portion being provided with a first through hole penetrating in the first direction, the first through hole being in communication with the liquid injection hole, and the accommodation space being in communication with the third groove. In this way, by means of the second protruding portion and the accommodation space, it is conducive to entering the accommodation space while meeting the insulation performance of the insulation member, thereby increasing the arrangement space of the electrode assembly; and by means of the first through hole, the electrolyte can pass through the insulation member to contact the electrode assembly.

[0022] In some embodiments, the second protruding portion is provided with a second through hole penetrating through one side of the second protruding portion perpendicular to the first direction, the second through hole being in communication with the third recess and the accommodating space, and the first through hole and the liquid injection hole both extend along the first direction. The extending direction of the second through hole is different from the extending direction of the first through hole, so as to reduce the electrolyte flowing out of the first through hole and then entering the second through hole, and to make the electrolyte accumulate in the accommodating space before entering the second through hole; meanwhile, the probability of contact between the first shell wall and the electrode assembly through the second through hole due to relative movement along the first direction is reduced.

[0023] In some embodiments, an adapter channel is formed between the inner wall of the accommodating cavity and the second protruding portion along a second direction, the first direction being perpendicular to the second direction, and the adapter channel being in communication with the second through hole and the third recess. In this way, the electrolyte flows from the second through hole to the third recess through the adapter channel, and the adverse effect of the inner wall of the accommodating cavity on the liquid injection efficiency is reduced.

[0024] In some embodiments, the part of the insulating member outside the second protruding portion is provided with a third through hole penetrating along the first direction, and the third through hole, the third recess and the second through hole are in communication with each other. In this way, the outlet of the flow guide channel is formed through the third through hole, so that the electrolyte can contact more areas of the electrode assembly, and the purpose of improving the liquid injection efficiency is achieved.

[0025] In some embodiments, in the projection perpendicular to the first direction, the ratio of the projection area of the third through hole to the projection area of the first shell wall ranges from 10% to 50%. In this way, on the one hand, the total cross-sectional area of the third through hole can meet the flow requirement of the electrolyte flowing out; on the other hand, the insulating performance of the insulating member can be met, and the structural strength of the insulating member can also meet the requirement.

[0026] In some embodiments, the number of the third through holes is multiple, and at least part of the third through holes are arranged in a direction away from the accommodating cavity. In this way, multiple flow channels for the electrolyte flowing out are formed, and the probability of electrolyte accumulation in the third recess is reduced, and the liquid injection efficiency is improved.

[0027] In some embodiments, in the projection plane perpendicular to the first direction, the diameter of the inscribed circle of the contour of the third through hole is not more than 15 mm. In this way, the probability of contact between the electrode assembly and the main body through the third through hole due to the movement of the electrode assembly is reduced, and the insulating performance of the insulating member is improved.

[0028] In some embodiments, the third groove is located on the main body part, and a ratio of a size of the third groove along the first direction to a size of the main body part along the first direction is not less than 20% and not greater than 70%. In this way, the cross-sectional area of the third groove can meet the flow requirement of the electrolyte, and the liquid injection efficiency can be improved. Meanwhile, the structural strength requirement of the main body part can also be met.

[0029] In some embodiments, the third groove is located on the main body part, and a ratio of a size of the third groove along the first direction to a size of the main body part along the first direction ranges from one third to 50%. In this way, the cross-sectional area of the third groove can more easily meet the flow requirement of the electrolyte, and the liquid injection efficiency can be improved. Meanwhile, the structural strength requirement of the main body part can also be met.

[0030] In some embodiments, a size of the part of the flow guide channel between the main body part and the insulating part along the first direction ranges from 0.5 mm to 5 mm. In this way, the cross-sectional area of the part of the flow guide channel between the main body part and the insulating part can meet the flow requirement of the electrolyte, and the liquid injection efficiency can be improved. Meanwhile, the structural strength requirement of the insulating part and the main body part can also be met.

[0031] In some embodiments, the mounting part protrudes from the surface of the main body part in a direction away from the accommodation cavity. In this way, the volume in the accommodation cavity is increased, and the probability of problems such as electrolyte overflow due to excessive accumulation of electrolyte in the accommodation cavity is reduced. The thickness of the mounting part and the main body part is consistent, so that the structure of the first shell wall is more compact, and the structure is lightweight.

[0032] In some embodiments, the number of the mounting parts is multiple, and each of the mounting parts is provided with the liquid injection hole. In this way, electrolyte can be injected into the battery monomer through multiple liquid injection holes at the same time, so that the total flow of the injected electrolyte is increased, and the liquid injection time is shortened.

[0033] In some embodiments, the number of the mounting parts is multiple, the flow guide channel communicates the accommodation cavities of at least two mounting parts, and the mounting part corresponding to at least one of the accommodation cavities communicated by the flow guide channel is provided with the liquid injection hole. In this way, the flow range of the electrolyte in the shell is further expanded, the number of the liquid injection holes is reduced, the manufacturing process of the shell is simplified, and the structural strength of the shell is improved.

[0034] In some embodiments, the at least two accommodation cavities in communication with the flow channel are respectively arranged at one end of the first shell wall in the length direction. In this way, the length of the flow path of the electrolyte in the flow channel is further extended, the capacity of the electrolyte that can be accommodated by the flow channel is increased, the flow range of the electrolyte is expanded, and the liquid injection efficiency is further improved.

[0035] In some embodiments, the shell comprises a shell body and a cover assembly, the shell body is open along one side in a first direction to form an opening, the cover assembly covers the opening and cooperates with the shell body to form a mounting space, at least part of the electrode assembly is located in the mounting space, and at least part of the cover assembly forms the first shell wall. In this way, the accommodation cavities, liquid injection holes and other structures are located on the same component, which facilitates the synchronization of these structures after the completion of the manufacturing of the cover assembly and the cooperation with the shell body to form the shell, and the processing and assembly efficiency is improved.

[0036] In some embodiments, at least part of the flow channel extends along the length direction of the battery monomer. In this way, the size of the flow channel is extended, and the flow range of the electrolyte is increased.

[0037] In some embodiments, the size range of the flow channel along the spacing direction between the main body and the electrode assembly is 1mm to 6mm. In this way, the cross-sectional size of the flow channel meets the flow requirement of the electrolyte.

[0038] In some embodiments, the battery monomer further comprises a pole, the pole is arranged in the mounting part, part of the pole is located in the accommodation cavity, the electrode assembly comprises a pole piece and a pole lug, the pole lug is located on the side of the pole piece close to the first shell wall, at least part of the pole lug is located in the accommodation cavity and electrically connected with the pole. In this way, the space inside the shell is adapted to the outer shape of the electrode assembly, and the arrangement of each component in the battery monomer is more compact.

[0039] The embodiments of the present disclosure also provide a battery comprising the battery monomer of any one of the preceding embodiments. By using the battery monomer, the liquid injection efficiency of the electrolyte is improved, and the production efficiency of the battery is improved.

[0040] The embodiments of the present disclosure also provide a power consuming device comprising the battery of the preceding embodiments, and the battery is used to provide power for the power consuming device. By improving the liquid injection efficiency of the electrolyte in the battery monomer, the production efficiency of the power consuming device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] FIG. 1 is a schematic view of a power consuming device as a vehicle in an embodiment of the present disclosure;

[0042] Fig. 2 is a schematic view of a battery in an embodiment of the present disclosure;

[0043] Fig. 3 is a schematic view of a battery cell in a first embodiment of the present disclosure;

[0044] Fig. 4 is a schematic view of the embodiment in Fig. 3 from another perspective;

[0045] Fig. 5 is a schematic view of a cross-section of the embodiment in Fig. 3 at position A-A;

[0046] Fig. 6 is a schematic view of a partial enlargement of the embodiment in Fig. 5 at position B;

[0047] Fig. 7 is a schematic view of a battery cell in a second embodiment of the present disclosure;

[0048] Fig. 8 is a schematic view of a partial enlargement of the embodiment in Fig. 7 at position C;

[0049] Fig. 9 is a schematic view of the embodiment in Fig. 7 from another perspective;

[0050] Fig. 10 is a schematic view of a partial enlargement of the embodiment in Fig. 9 at position E;

[0051] Fig. 11 is a schematic view of a cross-section of the embodiment in Fig. 7 at position D-D;

[0052] Fig. 12 is a schematic view of a partial enlargement of the embodiment in Fig. 11 at position F;

[0053] Fig. 13 is a schematic view of a partial enlargement of a battery cell in a third embodiment of the present disclosure, the enlargement being at the same position B as in Fig. 5;

[0054] Fig. 14 is a schematic view of a cross-section of the embodiment in Fig. 13, the cross-section being at the same position D-D as in Fig. 7;

[0055] Fig. 15 is a schematic view of a partial enlargement of the embodiment in Fig. 14 at position G;

[0056] Fig. 16 is a schematic view of a battery cell in a fourth embodiment of the present disclosure;

[0057] Fig. 17 is a schematic view of the embodiment in Fig. 16 from another perspective;

[0058] Fig. 18 is a schematic view of a cross-section of the embodiment in Fig. 16 at position H-H;

[0059] Fig. 19 is a schematic view of a partial enlargement of the embodiment in Fig. 18 at position J;

[0060] Fig. 20 is a schematic view of a cross-section of the embodiment in Fig. 17 at position I-I;

[0061] Fig. 21 is a schematic view of a partial enlargement of the embodiment in Fig. 20 at position K;

[0062] Fig. 22 is a partial enlarged view of the battery cell in the fifth embodiment of the present disclosure, the partial enlarged position being the same as position K in Fig. 20;

[0063] Fig. 23 is a partial enlarged view of the battery cell in the sixth embodiment of the present disclosure, the partial enlarged position being the same as position K in Fig. 20;

[0064] Fig. 24 is a schematic view of an insulating member in an embodiment of the present disclosure;

[0065] Fig. 25 is a partial enlarged view of position L in Fig. 24. DETAILED DESCRIPTION

[0066] It should be noted that the embodiments and technical features in the present disclosure can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0067] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "include" and "have" and any variations thereof in the description of the present disclosure and the above drawings are intended to cover non-exclusive inclusion.

[0068] In the description of the embodiments of the present disclosure, the technical terms "first", "second", "third" and the like 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 disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0069] In the present disclosure, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present disclosure. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present disclosure can be combined with other embodiments.

[0070] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present disclosure generally represents an "or" relationship between the front and rear associated objects.

[0071] In the description of the embodiments of the present disclosure, as shown by arrows in FIGS. 4, 5, 7, 13, 14 and 17, the direction in which X is located is the "first direction" and the "length direction of the battery cell"; as shown by arrows in FIGS. 3, 4, 7, 9, 16, 17 and 24, the direction in which Y is located is the "second direction".

[0072] In the description of the embodiments of the present disclosure, unless explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0073] In the description of the embodiments of the present disclosure, unless explicitly specified and limited, the technical term "contacting" should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two elements in contact without interaction force, or contact between two elements in contact with interaction force.

[0074] At present, batteries are increasingly widely used in life and industry. Batteries are not only used in energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and in many fields such as aerospace. With the continuous expansion of the application field of batteries, the market demand is also increasing.

[0075] FIG. 2 is a perspective exploded view of the battery 100 provided by the embodiments of the present disclosure. As shown in FIG. 2, the battery 100 includes a box body 20 and at least one battery cell 110.

[0076] The box body 20 includes a top cover 21 and a bottom cover 22, and the top cover 21 is covered above the bottom cover 22, so as to form an installation space for placing the battery cell 110 between the bottom cover 22 and the top cover 21.

[0077] In the battery 100, the battery cells 110 can be multiple, and the multiple battery cells 110 can be connected in series, in parallel, or in a mixed manner. The mixed manner refers to that the multiple battery cells 110 are connected in series and in parallel. The multiple battery cells 110 can be directly connected in series, in parallel, or in a mixed manner, and the whole formed by the multiple battery cells 110 is placed in the accommodating space formed by the top cover 21 and the bottom cover 22. Of course, the battery 100 can also be that the multiple battery cells 110 are connected in series, in parallel, or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and are accommodated in the accommodating space formed by the top cover 21 and the bottom cover 22. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing electrical connection between the multiple battery cells 110.

[0078] The battery cell 110 involved in the embodiments of the present disclosure can include 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 110 can work by moving metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer, and the current collector without the positive electrode active material layer is laminated to serve as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the negative electrode active material layer protrudes from the current collector with the negative electrode active material layer, and the current collector without the negative electrode active material layer is laminated to serve as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure.

[0079] The battery cell 110 can be a secondary battery, which refers to a battery cell 110 that can be activated by charging after discharging to continue to be used.

[0080] The battery cell 110 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., or a solid-state battery. The embodiments of the present disclosure are not limited thereto.

[0081] The battery cell 110 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like, and the embodiments of the present disclosure are not particularly limited.

[0082] The battery 100 involved in the embodiments of the present disclosure refers to a single physical module including one or more battery cells 110 to provide higher voltage and capacity.

[0083] The power consuming device involved in the embodiments of the present disclosure is powered by the battery described above, and the power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0084] In the following embodiments, for the convenience of description, the power consuming device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described in conjunction with the drawings.

[0085] FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by an embodiment of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, and the like. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, and the battery 100 can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0086] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0087] Next, the embodiments of the present disclosure are described in detail.

[0088] In the related art, the battery cell includes a shell and an electrode assembly, the electrode assembly is arranged in an internal space of the shell, and a liquid injection hole is arranged on the shell and communicates an outside of the shell and the internal space of the shell. During the manufacturing process of the battery cell, electrolyte is injected into the internal space of the shell through the liquid injection hole, so that the electrolyte can soak the electrode assembly.

[0089] In order to improve the energy density of the battery cell, the structure of the battery cell becomes more and more compact, which makes the distance between the outlet of the injection hole and the electrode assembly closer. Thus, during the injection process, after the electrolyte flows out of the injection hole and contacts the electrode assembly, affected by the penetration rate of the electrolyte in the electrode assembly, part of the electrolyte will be blocked by the electrode assembly and thus block the subsequent electrolyte, which may cause the electrolyte to overflow from the injection hole and adversely affect the injection flow of the electrolyte, affecting the production efficiency.

[0090] Based on the above technical problems, the embodiments of the present disclosure aim to provide a battery cell, a part of the space in the shell forms an accommodation cavity, a flow guide channel is provided in the gap between the shell and the electrode assembly, the injection hole and the flow guide channel are both communicated with the accommodation cavity, so that the electrolyte entering the accommodation cavity can be directly penetrated into the electrode assembly by the accommodation cavity, and the other part enters the flow guide channel and is guided to penetrate into other areas of the electrode assembly, thereby improving the injection efficiency of the electrolyte.

[0091] Specifically, referring to FIGS. 3-5, the embodiments of the present disclosure provide a battery cell 110, which includes a shell 10 and an electrode assembly 12.

[0092] The shell 10 has a first shell wall 11 and an injection hole 10a provided on the first shell wall 11, the first shell wall 11 includes a main body part 111 and a mounting part 112, the inner wall of the mounting part 112 is recessed to form an accommodation cavity 112a, at least one mounting part 112 is provided with an injection hole 10a, and the injection hole 10a communicates the outside of the shell 10 with the accommodation cavity 112a.

[0093] The electrode assembly 12 is arranged in the shell 10.

[0094] The main body part 111 and the electrode assembly 12 have a flow guide channel 10b, and the flow guide channel 10b is communicated with the accommodation cavity 112a.

[0095] A plurality of shell walls surround to form the shell 10 and form a space for arranging the electrode assembly 12 inside. The outer surface of the shell wall forms at least part of the outer surface of the battery cell 110.

[0096] The first shell wall 11 refers to the shell wall of the plurality of shell walls forming the shell 10, which is provided with the injection hole 10a.

[0097] The injection hole 10a penetrates through the first shell wall 11 to communicate the outside of the shell 10 with the inside of the shell 10, so that the electrolyte can enter the inside space of the shell 10 through the injection hole 10a.

[0098] The inner wall of the mounting portion 112 is recessed, which means that the surface of the mounting portion 112 on the side facing the electrode assembly 12 is offset from the surface of the main body portion 111 on the side facing the electrode assembly 12 in the opposite direction of the first shell wall 11 and the electrode assembly 12, so that the distance between the surface of the mounting portion 112 on the side facing the electrode assembly 12 and the tab 121 of the electrode assembly 12 is greater than the distance between the surface of the main body portion 111 on the side facing the electrode assembly 12 and the tab 121 of the electrode assembly 12.

[0099] The space inside the accommodation cavity 112a is part of the space inside the shell 10, and the side of the accommodation cavity 112a facing the electrode assembly 12 is open to communicate with the other part of the space inside the shell 10.

[0100] The electrolyte injection hole 10a communicates with the accommodation cavity 112a, so that after the electrolyte flows out of the electrolyte injection hole 10a, it enters the other part of the space inside the shell 10 through the open position of the accommodation cavity 112a, and then penetrates into the electrode assembly 12.

[0101] It can be understood that, due to the blocking of the electrode assembly 12 and the penetration speed of the electrolyte in the electrode assembly 12, part of the electrolyte will accumulate in the accommodation cavity 112a.

[0102] The flow guide channel 10b communicates with the part of the space inside the shell 10 facing the main body portion 111, and the flow guide channel 10b also communicates with the accommodation cavity 112a, so that part of the electrolyte accumulated in the accommodation cavity 112a can enter the flow guide channel 10b, and then further enter the part of the space inside the shell 10 facing the main body portion 111 through the open position of the flow guide channel 10b, and then penetrate into other parts of the electrode assembly 12.

[0103] The battery monomer 110 in the embodiment of the present disclosure can at least partially guide the electrolyte accumulated in the accommodation cavity 112a to other areas of the space inside the shell 10 by setting the additional flow guide channel 10b, thereby improving the penetration speed of the electrolyte in the electrode assembly 12, expanding the flow range of the electrolyte in the shell 10, reducing the probability of problems such as blocking of subsequent electrolyte, electrolyte overflow from the shell 10, etc. due to excessive accumulation of electrolyte in the accommodation cavity 112a, improving the efficiency of electrolyte injection, and being conducive to improving the flow of injected electrolyte, thereby improving the production efficiency of the battery monomer 110.

[0104] It can be understood that at least part of the inner wall of the flow guide channel 10b on the side facing the electrode assembly 12 is open, so as to realize the purpose of communication between the flow guide channel 10b and other areas of the space inside the shell 10.

[0105] Referring to FIG. 6, the main body part 111 is spaced apart from the electrode assembly 12 to form a gap 10c, and the gap 10c forms at least part of the flow guide passage 10b. The gap 10c is formed by the space between the electrode assembly 12 and the main body part 111, and the flow guide passage 10b is arranged in the gap 10c. The open position of the flow guide passage 10b communicates with the portion of the internal space of the case 10 toward which the main body part 111 faces, and the flow guide passage 10b communicates with the accommodation cavity 112a, so that part of the electrolyte accumulated in the accommodation cavity 112a can enter the flow guide passage 10b and further enter the portion of the internal space of the case 10 toward which the main body part 111 faces through the open position of the flow guide passage 10b, and then infiltrate other parts of the electrode assembly 12.

[0106] The specific number of the mounting part 112 is not limited, and can be one or multiple, and correspondingly, the number of the liquid injection hole 10a can be one or multiple.

[0107] The at least one mounting part 112 is provided with the liquid injection hole 10a, which means that only one mounting part 112 can be provided with the liquid injection hole 10a, or multiple mounting parts 112 can be provided with the liquid injection hole 10a.

[0108] It can be understood that the flow guide passage 10b can be part of the space of the gap 10c, or can be formed by other structures in the battery monomer 110.

[0109] In some embodiments, referring to FIG. 6, the surface of the main body part 111 on the side facing the electrode assembly 12 is provided with a first groove 111b, and the first groove 111b is open on the side facing the electrode assembly 12. The first groove 111b forms at least part of the flow guide passage 10b.

[0110] Part of the surface of the main body part 111 on the side facing the electrode assembly 12 is recessed in the direction away from the electrode assembly 12 to form the first groove 111b.

[0111] In this way, the structure of the flow guide passage 10b can be simplified, so that the electrolyte can directly flow to other areas of the internal space of the case 10 under the guidance of the main body part 111, and the structure of the battery monomer 100 is simplified.

[0112] In some embodiments, the case 10 is made of a metal material, so that on the one hand, the case 10 has high structural strength, and on the other hand, the ductility of the metal is utilized to facilitate one-time forming of the case 10 by stamping and other process methods, thereby simplifying the manufacturing steps and improving the production efficiency.

[0113] In the embodiment in which the case 10 is made of a metal material, the case 10 has electrical conductivity, and therefore it is necessary to reduce the probability of contact between the electrode assembly 12 and the case 10 to reduce the risk of short circuit caused by electrical connection between the two.

[0114] Specifically, referring to FIGS. 11-15, 19-23, the battery cell 110 further comprises an insulating member 15 located between the first shell wall 11 and the electrode assembly 12. In this way, the risk of electrical conduction between the first shell wall 11 and the electrode assembly 12 leading to short circuit is reduced by the insulating property of the insulating member 15.

[0115] The specific type of the insulating member 15 is not limited, such as a plastic member, an insulating film, etc.

[0116] In some embodiments provided with the insulating member 15, referring to FIGS. 16-23, at least part of the flow channel 10b is located between the insulating member 15 and the first shell wall 11. That is, the flow channel 10b is formed by the insulating member 15 and the first shell wall 11 together.

[0117] In this way, it is beneficial to simplify the structure of the flow channel 10b, reduce the probability of the cross-section of the flow channel 10b changing due to relative movement between the insulating member 15 and the electrode assembly 12, and facilitate the flow channel 10b to maintain its cross-sectional size unchanged under different working conditions to meet the flow demand of the electrolyte.

[0118] It can be understood that part of the insulating member 15 is located in the gap 10c.

[0119] In some embodiments provided with the insulating member 15, at least part of the flow channel 10b is located inside the insulating member 15, that is, at least part of the flow channel 10b is formed by the insulating member 15 alone, and at least part of the flow channel 10b is an internal passage of the insulating member 15.

[0120] In this way, it is beneficial to reduce the influence of the cross-sectional size of the flow channel 10b being affected by the relative position change of the first shell wall 11 and the electrode assembly 12.

[0121] In some embodiments provided with the insulating member 15, referring to FIGS. 13, 14 and 15, at least part of the flow channel 10b is located between the electrode assembly 12 and the first shell wall 11.

[0122] That is, the flow channel 10b is formed by the electrode assembly 12 and the insulating member 15 together.

[0123] In this way, it is beneficial to increase the contact area of the insulating member 15 and the first shell wall 11, improve the insulating property and the installation stability of the insulating member 15, simplify the structure of the flow channel 10b, reduce the probability of the cross-section of the flow channel 10b changing due to relative movement between the insulating member 15 and the first shell wall 11, and facilitate the flow channel 10b to maintain its cross-sectional size unchanged under different working conditions to meet the flow demand of the electrolyte.

[0124] In some embodiments provided with multiple flow guide channels 10b, one flow guide channel 10b is located between the electrode assembly 12 and the insulating member 15, and another flow guide channel 10b is located between the insulating member 15 and the first shell wall 11, so that the two flow guide channels 10b can back up each other to better meet the flow requirement of the electrolyte.

[0125] The specific form of the flow guide channel 10b located between the electrode assembly 12 and the insulating member 15 is not limited.

[0126] In some embodiments, referring to FIGS. 13-15, a portion of the insulating member 15 is spaced apart from the electrode assembly 12 to form at least part of the flow guide channel 10b. That is, another portion of the insulating member 15 abuts the electrode assembly 12.

[0127] In this way, on the one hand, the space formed by the two spaced apart portions forms the flow guide channel 10b, and on the other hand, the portion formed by the two abutting portions helps to keep the relative position of the two stable and reduce the adverse effects of deformation of the flow guide channel 10b on the flow of the electrolyte in the flow guide channel 10b.

[0128] In some embodiments, referring to FIG. 15, the side of the insulating member 15 facing the electrode assembly 12 is provided with a second groove 15a, the second groove 15a is open toward the electrode assembly 12, and the second groove 15a forms at least part of the flow guide channel 10b.

[0129] The second groove 15a and the receiving cavity 112a can be directly connected or indirectly connected through other channels to the receiving cavity 112a.

[0130] The electrolyte in the second groove 15a can flow out through the open position of the second groove 15a toward the electrode assembly 12 and directly contact the electrode assembly 12.

[0131] In this way, the structure of the second groove 15a is simple and easy to manufacture, which is conducive to expanding the open area of the flow guide channel 10b, facilitating the electrolyte in the flow guide channel 10b to contact the electrode assembly 12 more quickly, and improving the efficiency of electrolyte injection.

[0132] It can be understood that in embodiments in which the insulating member 15 is made of plastic material by injection molding process, the second groove 15a can be formed by pulling the mold through the open position of the second groove 15a, thereby facilitating one-time molding of the second groove 15a and improving the production efficiency.

[0133] In some embodiments, the second groove 15a is open along both sides of the first shell wall 11 opposite the electrode assembly 12, and the second groove 15a forms at least part of the flow channel 10b. In this way, the space of the gap 10c can be more fully utilized, the cross-sectional area of the second groove 15a can be expanded, and the upper limit of the flow rate of the electrolyte in the second groove 15a can be increased.

[0134] The specific form of the flow channel 10b between the first shell wall 11 and the insulating member 15 is not limited.

[0135] In some embodiments, referring to FIGS. 21-23, a portion of the insulating member 15 is spaced apart from the main body portion 111 in the first direction to form at least part of the flow channel 10b. That is, another portion of the insulating member 15 abuts the first shell wall 11.

[0136] In this way, on the one hand, the space formed by the spacing between the two forms the flow channel 10b, and on the other hand, the portion formed by the abutment between the two helps to achieve stable relative positions between the two, reducing the adverse effects of deformation of the flow channel 10b on the flow of electrolyte in the flow channel 10b.

[0137] In some embodiments, referring to FIGS. 19-23, at least one of the surface of the main body portion 111 facing the side of the insulating member 15 and the surface of the insulating member 15 facing the side of the main body portion 111 is provided with a third groove 111a, the third groove 111a is open on one side in the first direction, and the third groove 111a forms at least part of the flow channel 10b.

[0138] The third groove 111a and the accommodation cavity 112a can be directly connected or indirectly connected through other channels to the accommodation cavity 112a.

[0139] Referring to FIGS. 19, 20, and 21, only the surface of the main body portion 111 facing the side of the insulating member 15 can be provided with the third groove 111a, which is open on the side facing the insulating member 15 in the first direction; referring to FIG. 22, only the surface of the insulating member 15 facing the side of the main body portion 111 can be provided with the third groove 111a, which is open on the side facing the main body portion 111 in the first direction; referring to FIG. 23, the surface of the main body portion 111 facing the side of the insulating member 15 and the surface of the insulating member 15 facing the side of the main body portion 111 can both be provided with the third groove 111a, i.e., the number of third grooves 111a is two, one of which is open on the side facing the insulating member 15, and the other of which is open on the side facing the main body portion 111, and the open positions of the two third grooves 111a are connected to each other.

[0140] In this way, the third groove 111a can be manufactured by machining the open position thereof, and the structure thereof is simple and easy to manufacture.

[0141] It can be understood that, in the embodiment in which the main body 111 is provided with the third groove 111a, referring to FIG. 21 and FIG. 23, the area of the main body 111 forming the third groove 111a is thinner in thickness than other areas.

[0142] In some embodiments, referring to FIG. 8 to FIG. 12, a portion of the main body 111 protrudes in the first direction towards the side away from the electrode assembly 12 to form the first protruding portion 1111, and forms the third groove 111a on the other side.

[0143] In this way, it is beneficial to increase the cross-sectional area of the third groove 111a, which is conducive to meeting the flow demand of the flow guide channel 10b; it is also convenient to increase the thickness of the area of the main body 111 provided with the third groove 111a, so as to improve the structural strength of the main body 111.

[0144] The stamping method can be used to deform part of the area of the main body 111 to synchronously form the first protruding portion 1111 and the third groove 111a, so as to improve the production efficiency and also facilitate the consistency of the size of each area of the main body 111 in the opposite direction of the thickness thereof.

[0145] The thickness of the main body 111 refers to the direction of the main body 111 opposite to the insulating piece 15, that is, the first direction.

[0146] Referring to FIG. 8 and FIG. 10, in some embodiments in which the mounting portion 112 protrudes from the main body 111, the first protruding portion 1111 is connected with the mounting portion 112, so as to further improve the structural strength of the shell 10.

[0147] It can be understood that the protruding directions of the mounting portion 112 and the first protruding portion 1111 are both the first direction.

[0148] Referring to FIG. 9, in the embodiment in which the two mounting portions 112 are respectively located at one end of the shell 10 in the length direction and protrude from the main body 111, the first protruding portion 1111 extends in the length direction and connects the two mounting portions 112, so as to further improve the bending resistance of the battery monomer 110.

[0149] In some embodiments, referring to FIG. 18, FIG. 19 and FIG. 25, the insulating piece 15 is provided with a second protruding portion 151, the second protruding portion 151 protrudes in the first direction away from the electrode assembly 12 and forms an accommodation space 151b on the other side, at least part of the second protruding portion 151 is arranged in the accommodation cavity 112a, the third protruding portion is provided with a first through hole 151a penetrating in the first direction, the first through hole 151a is in communication with the liquid injection hole 10a, and the accommodation space 151b is in communication with the third groove 111a.

[0150] The accommodating space 151b is open to the electrode assembly 12 along a side of the mounting portion 112 in the first direction. The electrolyte enters the accommodating cavity 112a through the liquid injection hole 10a, and enters the accommodating space 151b through the first through hole 151a. The electrolyte in the accommodating space 151b can directly penetrate into the electrode assembly 12 through the open position of the accommodating space 151b, and the other part of the electrolyte can enter the third groove 111a.

[0151] In this way, by the second protruding portion 151 and the accommodating space 151b, it is beneficial to make a part of the electrode assembly 12 enter the accommodating space 151b while meeting the insulation performance of the insulating member 15, thereby increasing the arrangement space of the electrode assembly 12; and by the first through hole 151a, the purpose of the electrolyte passing through the insulating member 15 to contact the electrode assembly 12 is achieved.

[0152] In some embodiments, referring to FIG. 19, the first through hole 151a and the liquid injection hole 10a both extend along the first direction, so as to increase the cross-sectional area of the first through hole 151a and the cross-sectional area of the liquid injection hole 10a, and improve the injection flow of the electrolyte.

[0153] The first protruding portion 1111 can abut against the inner wall of the accommodating cavity 112a along the first direction, so that the electrolyte flowing out of the liquid injection hole 10a mainly directly flows to the first through hole 151a; or the first protruding portion 1111 can be spaced from the inner wall of the accommodating cavity 112a along the first direction, and part of the electrolyte flowing out of the liquid injection hole 10a enters the third groove 111a through the space formed between the inner wall of the accommodating cavity 112a and the first protruding portion 1111.

[0154] In some embodiments in which the first through hole 151a and the liquid injection hole 10a both extend along the first direction, referring to FIG. 19, FIG. 24 and FIG. 25, the second protruding portion 151 is provided with a second through hole 151c penetrating a side thereof perpendicular to the first direction, and the second through hole 151c communicates the third groove 111a and the accommodating space 151b.

[0155] The extension direction of the second through hole 151c is different from the extension direction of the first through hole 151a, so as to reduce the electrolyte flowing out of the first through hole 151a and then entering the second through hole 151c, so that the electrolyte can enter the second through hole 151c only after accumulating in the accommodating space 151b; and meanwhile, the probability of contact between the first shell wall 11 and the electrode assembly 12 through the second through hole 151c due to relative movement along the first direction is reduced.

[0156] It can be understood that, referring to FIG. 19, the second through hole 151c is towards the inner wall of the side of the accommodating cavity 112a perpendicular to the first direction.

[0157] In some embodiments, referring to FIG. 19, the inner wall of the accommodating cavity 112a and the second protruding portion 151 are spaced apart along a second direction to form a transition channel 112b, the first direction being perpendicular to the second direction, and the transition channel 112b being in communication with the second through hole 151c and the third groove 111a.

[0158] After the electrolyte solution flows out of the second through hole 151c, it flows into the third groove 111a through the transition channel 112b.

[0159] In this way, the electrolyte solution flows from the second through hole 151c to the third groove 111a through the transition channel 112b, reducing the adverse effects of the inner wall of the accommodating cavity 112a on the injection efficiency of the electrolyte solution.

[0160] It can be understood that, referring to FIG. 19, the third groove 111a is open along at least one side in the second direction to communicate with the transition channel 112b.

[0161] In some embodiments, the second direction is the length direction of the shell 10.

[0162] In some embodiments, referring to FIGS. 19, 21-23 and 24, the portion of the insulating member 15 outside the second protruding portion 151 is provided with a third through hole 15b penetrating along the first direction, and the third through hole 15b, the third groove 111a and the second through hole 151c are in communication with each other.

[0163] The electrolyte solution in the third groove 111a enters the third through hole 15b and directly contacts the electrode assembly 12 after flowing out of the third through hole 15b.

[0164] It can be understood that the third groove 111a and the third through hole 15b together form at least part of the flow guide channel 10b. The third through hole 15b forms an open portion of the flow guide channel 10b towards the electrode assembly 12.

[0165] In this way, by forming the third through hole 15b as the outlet of the flow guide channel 10b, the electrolyte solution can contact more areas of the electrode assembly 12, achieving the purpose of improving the injection efficiency.

[0166] In some embodiments, in a projection perpendicular to the first direction, the ratio of the projection area of the third through hole 15b to the projection area of the first shell wall 11 ranges from 10% to 50%.

[0167] In this way, on the one hand, it is beneficial to make the total cross-sectional area of the third through hole 15b meet the flow rate requirement of the electrolyte solution; on the other hand, it is beneficial to meet the requirement of the insulation performance of the insulating member 15, and also beneficial to make the structural strength of the insulating member 15 meet the requirement.

[0168] The ratio of the projected area of the third through hole 15b to the projected area of the first shell wall 11 can be 10%, 20%, 30%, 40%, 50%, etc.

[0169] In some embodiments, referring to FIGS. 18 and 24, the number of third through holes 15b is multiple, and at least some of the third through holes 15b are arranged in a direction away from the accommodation cavity 112a.

[0170] In this way, it is beneficial to form multiple flow channels for the electrolyte to flow out, thereby reducing the probability of electrolyte accumulation in the third groove 111a and improving the efficiency of liquid injection.

[0171] In some embodiments, the direction away from the accommodation cavity 112a is one direction along the second direction.

[0172] In the projection plane perpendicular to the first direction, the specific shape of the projection profile of the third through hole 15b is not limited, for example, circular, rectangular, etc.

[0173] In some embodiments, in the projection plane perpendicular to the first direction, the diameter of the inscribed circle of the profile of the third through hole 15b is not more than 15 mm (millimeter).

[0174] In this way, it is beneficial to reduce the probability of contact between the third through hole 15b and the main body due to the movement of the electrode assembly 12, and to improve the insulation performance of the insulating part 15.

[0175] The diameter of the inscribed circle of the profile of the third through hole 15b can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0176] In some embodiments, the third groove 111a is located in the main body part 111, and the ratio of the size of the third groove 111a along the first direction to the size of the main body part 111 along the first direction is not less than 20% and not more than 70%. That is, referring to FIG. 21, 20%≤L1 / L3≤70%.

[0177] In this way, it is beneficial to meet the flow requirement of the electrolyte for the cross-sectional area of the third groove 111a, thereby improving the efficiency of liquid injection; at the same time, it is also beneficial to meet the structural strength requirement of the main body part 111.

[0178] In some embodiments, the third groove 111a is located in the main body part 111, and the ratio of the size of the third groove 111a along the first direction to the size of the main body part 111 along the first direction ranges from one-third to 50%. That is, referring to FIG. 21, 1 / 3≤L1 / L3≤50%.

[0179] Therefore, the cross-sectional area of the third groove 111a can meet the flow requirement of the electrolyte, and the liquid injection efficiency can be improved. Meanwhile, the structural strength requirement of the main body 111 can be met.

[0180] The specific ratio of the size of the third groove 111a along the first direction to the size of the main body 111 along the second direction can be 30%, 40%, or 50%.

[0181] In some embodiments, the size of the portion of the flow guide channel 10b between the main body 111 and the insulating member 15 along the first direction ranges from 0.5 mm to 5 mm. That is, 0.5 mm≤L1≤5 mm.

[0182] Referring to FIGS. 21 to 23, the portion of the flow guide channel 10b between the main body 111 and the insulating member 15 can have only one third groove 111a or two third grooves 111a.

[0183] Therefore, the cross-sectional area of the portion of the flow guide channel 10b between the main body 111 and the insulating member 15 can meet the flow requirement of the electrolyte, and the liquid injection efficiency can be improved. Meanwhile, the structural strength requirement of the insulating member 15 and the main body 111 can be met.

[0184] The size of the portion of the flow guide channel 10b between the main body 111 and the insulating member 15 along the first direction can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or the like.

[0185] In some embodiments, referring to FIGS. 7, 8, 13, 18, and 19, the mounting portion 112 protrudes from the surface of the main body 111 in a direction away from the accommodation cavity 112a.

[0186] Therefore, the volume in the accommodation cavity 112a is increased, and the probability of problems such as electrolyte overflow caused by excessive accumulation of electrolyte in the accommodation cavity 112a is reduced. The thickness of the mounting portion 112 can be consistent with that of the main body 111, so that the structure of the first shell wall 11 is more compact, and the structure is lightweight.

[0187] The specific manufacturing method of the mounting portion 112 and the main body 111 is not limited. For example, a blank of the first shell wall 11 is stamped, and the portion that is recessed after stamping forms the mounting portion 112, and the portion that is not recessed forms the main body 111. The stamping process can improve the production efficiency.

[0188] In some embodiments in which the number of mounting portions 112 is multiple, each mounting portion 112 is provided with a liquid injection hole 10a. That is, the number of liquid injection holes 10a is multiple.

[0189] In this way, the electrolyte can be injected into the battery monomer 110 through the plurality of injection holes 10a synchronously, so as to increase the total flow of the injected electrolyte and shorten the injection time.

[0190] In some embodiments in which the number of installation portions 112 is multiple, referring to FIG. 5, the flow guide channel 10b is communicated with at least two accommodation cavities 112a, and the installation portion 112 corresponding to the at least one accommodation cavity 112a communicated by the flow guide channel 10b is provided with the injection hole 10a.

[0191] After the electrolyte enters one of the accommodation cavities 112a from the injection hole 10a, the electrolyte in the flow guide channel 10b flows out of the flow guide channel 10b directly through the open position of the flow guide channel 10b, and the electrolyte in the flow guide channel 10b flows into another accommodation cavity 112a in another installation portion 112.

[0192] In this way, the flow range of the electrolyte in the shell 10 is further expanded, the number of injection holes 10a is reduced, the manufacturing process of the shell 10 is simplified, and the structural strength of the shell 10 is improved.

[0193] In some embodiments in which the number of installation portions 112 is multiple, referring to FIG. 5, the at least two accommodation cavities 112a communicated by the flow guide channel 10b are respectively arranged at one end of the first shell wall 11 in the length direction.

[0194] The length direction of the first shell wall 11 refers to the straight line direction of the largest dimension in the three-dimensional size of the first shell wall 11.

[0195] The two accommodation cavities 112a are respectively arranged at one end of the first shell wall 11 in the length direction, so as to increase the distance between the two accommodation cavities 112a as much as possible.

[0196] In this way, the length of the flow path of the electrolyte in the flow guide channel 10b is further prolonged, the capacity of the electrolyte accommodated by the flow guide channel 10b is increased, the flow range of the electrolyte is expanded, and the injection efficiency is further improved.

[0197] The number of flow guide channels 10b is not limited and can be one or multiple.

[0198] The specific manner of forming the first shell wall 11 is not limited.

[0199] As shown in FIGS. 4 and 5, the housing 10 includes a shell 13 and an end cover 14 assembly. The shell 13 is open along one side in a first direction to form an opening 13b. The end cover 14 assembly covers the opening 13b and cooperates with the shell 13 to form a mounting space 13a. At least part of the electrode assembly 12 is located in the mounting space 13a. At least part of the end cover 14 assembly forms the first shell wall 11.

[0200] In this way, the accommodation cavity 112a and the liquid injection hole 10a are located on the same component. These structures are synchronized to be manufactured after the end cover 14 assembly is completed, and then the end cover 14 assembly is combined with the shell 13 to form the housing 10. This is beneficial to improve the efficiency of processing and assembly.

[0201] In some embodiments, as shown in FIGS. 3 and 5, at least part of the flow guide channel 10b extends along the length direction of the battery monomer 110.

[0202] The length direction of the battery monomer 110 is the direction of the longest dimension of the battery monomer 110.

[0203] In this way, it is beneficial to increase the size of the extended flow guide channel 10b, thereby increasing the flow range of the electrolyte.

[0204] In some embodiments, the length direction of the battery monomer 110 is the length direction of the housing 10.

[0205] In some embodiments, as shown in FIG. 6, the size range of the flow guide channel 10b along the spacing direction between the main body 111 and the electrode assembly 12 is 1 mm to 6 mm. 1 mm≤L3≤6 mm.

[0206] In this way, the cross-sectional size of the flow guide channel 10b meets the flow requirement of the electrolyte.

[0207] In some embodiments, as shown in FIGS. 6 and 19, the battery monomer 110 further includes a pole 16. The pole 16 penetrates the mounting portion 112. Part of the pole 16 is located in the accommodation cavity 112a. The electrode assembly 12 includes a pole piece 121 and a pole tab 122. The pole tab 122 is located on the side of the pole piece 121 close to the first shell wall 11. At least part of the pole tab 122 is located in the accommodation cavity 112a and electrically connected with the pole 16.

[0208] In this way, it is beneficial to make the space shape inside the housing 10 adapt to the outer contour shape of the electrode assembly 12, and to make the arrangement of each component in the battery monomer 110 more compact.

[0209] Specific embodiments of the battery monomer 110 of the present disclosure are as follows:

[0210] The battery cell 110 comprises an end cover 14 assembly, a shell 13, an insulating piece 15, an electrode assembly 12 and a pole 16. The shell 13 is open along one side in a first direction to form an opening 13b. The end cover 14 assembly covers the opening 13b and cooperates with the shell 13 to form a mounting space 13a. At least part of the electrode assembly 12 is located in the mounting space 13a. The end cover 14 assembly comprises a main body part 111 and a mounting part 112. The inner wall of the mounting part 112 is recessed to form a receiving cavity 112a. At least one of the mounting parts 112 is provided with a liquid injection hole 10a which communicates between the outside of the shell 10 and the receiving cavity 112a. The mounting part 112 protrudes from the surface of the main body part 111 in a direction away from the receiving cavity 112a. The insulating piece 15 is located between the end cover 14 assembly and the electrode assembly 12. Part of the main body part 111 protrudes in the first direction to form a first protruding part 1111 away from one side of the electrode assembly 12, and a third recess 111a is formed on the other side. The third recess 111a is open to one side of the insulating piece 15. The insulating piece 15 is provided with a second protruding part 151 which protrudes in the first direction away from one side of the electrode assembly 12 and forms a receiving space 151b on the other side. At least part of the second protruding part 151 is located in the receiving cavity 112a. The third protruding part is provided with a first through hole 151a which penetrates in the first direction. The first through hole 151a communicates with the liquid injection hole 10a. The receiving space 151b communicates with the third recess 111a. The second protruding part 151 is provided with a second through hole 151c which penetrates perpendicularly to one side in the first direction. The second through hole 151c communicates between the third recess 111a and the receiving space 151b. The first through hole 151a and the liquid injection hole 10a both extend in the first direction. The inner wall of the receiving cavity 112a and the second protruding part 151 are spaced apart in a second direction to form a transfer channel 112b. The first direction is perpendicular to the second direction. The transfer channel 112b communicates between the second through hole 151c and the third recess 111a. The part of the insulating piece 15 outside the second protruding part 151 is provided with a third through hole 15b which penetrates in the first direction. The third through hole 15b, the third recess 111a and the second through hole 151c communicate with each other. The number of mounting parts 112 is two. The two mounting parts 112 are respectively located at one end of the length direction of the end cover 14 assembly. The third recess 111a extends in the length direction of the end cover 14 assembly and communicates with the receiving cavities 112a of the two mounting seats respectively. The number of third through holes 15b is multiple. At least part of the third through holes 15b is spaced apart in a direction away from the receiving cavity 112a. In a projection perpendicular to the first direction, the ratio of the projection area of the third through hole 15b to the projection area of the end cover 14 assembly ranges from 10% to 50%. In a projection plane perpendicular to the first direction, the diameter of the inscribed circle of the contour of the third through hole 15b is not more than 15 mm. The ratio of the size of the third recess 111a in the first direction to the size of the main body part 111 in the first direction ranges from one third to 50%.

[0211] The battery provided by the embodiments of the present disclosure also has the advantages of reducing the probability of electrolyte overflowing the shell, improving the electrolyte injection efficiency, and improving the production efficiency.

[0212] The battery provided by the embodiments of the present disclosure also has the advantages of reducing the probability of electrolyte overflowing the shell, improving the electrolyte injection efficiency, and improving the production efficiency of the battery.

[0213] The various embodiments / implementation provided by the present disclosure can be combined with each other without producing contradictions.

[0214] The above merely describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure. Industrial applicability

[0215] The battery provided by the embodiments of the present disclosure also has the advantages of reducing the probability of electrolyte overflowing the shell, improving the electrolyte injection efficiency, and improving the production efficiency of the battery.

Claims

1. A battery cell, wherein, The battery cell comprises: a housing having a first housing wall and a liquid injection hole provided on the first housing wall, the first housing wall comprising a main body portion and a mounting portion, an inner wall of the mounting portion being recessed to form a receiving cavity, at least one of the mounting portions being provided with the liquid injection hole, the liquid injection hole being in communication with an outside of the housing and the receiving cavity; an electrode assembly provided in the housing; wherein a flow guide channel is provided between the main body portion and the electrode assembly, the flow guide channel being in communication with the receiving cavity.

2. The battery cell of claim 1, wherein, A first recess is provided on a surface of the main body portion facing the electrode assembly, the first recess being open on a side facing the electrode assembly, the first recess forming at least part of the flow guide channel.

3. The battery cell of claim 1, wherein, The battery cell further comprises an insulating member, the insulating member being located between the first housing wall and the electrode assembly, at least part of the flow guide channel being located between the insulating member and the first housing wall; and / or at least part of the flow guide channel is located between the electrode assembly and the insulating member.

4. The battery cell of claim 3, wherein, A portion of the insulating member is spaced apart from the electrode assembly to form at least part of the flow guide channel.

5. The battery cell of claim 4, wherein, A second recess is provided on a side of the insulating member facing the electrode assembly, the second recess being open on a side facing the electrode assembly, the second recess forming at least part of the flow guide channel.

6. The battery cell of any one of claims 3-5, wherein, A portion of the insulating member is spaced apart from the main body portion in a first direction to form at least part of the flow guide channel.

7. The battery cell of claim 6, wherein, At least one of a surface of the main body portion facing the insulating member and a surface of the insulating member facing the main body portion is provided with a third recess, the third recess being open on a side along the first direction, the third recess forming at least part of the flow guide channel.

8. The battery cell of claim 7, wherein, A portion of the main body portion protrudes in the first direction to form a first protruding portion on a side away from the electrode assembly and forms the third recess on another side.

9. The battery cell of claim 7 or 8, wherein, The insulating member is provided with a second protruding portion, the second protruding portion protruding in the first direction to form a receiving space on a side away from the electrode assembly and on another side, at least part of the second protruding portion being located in the receiving cavity, the third protruding portion being provided with a first through hole penetrating along the first direction, the first through hole being in communication with the liquid injection hole, the receiving space being in communication with the third recess.

10. The battery cell of claim 9, wherein, A second through hole penetrating a side of the second protruding portion perpendicular to the first direction is provided, the second through hole being in communication with the third recess and the receiving space, the first through hole and the liquid injection hole both extending along the first direction.

11. The battery cell of claim 10, wherein, An adapter channel is formed between an inner wall of the receiving cavity and the second protruding portion in a second direction, the first direction being perpendicular to the second direction, the adapter channel being in communication with the second through hole and the third recess.

12. The battery cell of claim 10 or 11, wherein, A portion of the insulating member outside the second protruding portion is provided with a third through hole penetrating along the first direction, the third through hole, the third recess and the second through hole being in communication with each other.

13. The battery cell of claim 12, wherein, In a projection perpendicular to the first direction, a ratio of a projection area of the third through hole to a projection area of the first housing wall ranges from 10% to 50%.

14. The battery cell of claim 12 or 13, wherein, The third through holes are multiple, and at least part of the third through holes are arranged in a spaced manner in a direction away from the accommodation cavity.

15. The battery cell of any one of claims 12-14, wherein, In a projection plane perpendicular to the first direction, a diameter of an inscribed circle of the contour of the third through hole is not more than 15 mm.

16. The battery cell of any one of claims 7-15, wherein, The third recess is located in the main body part, and a ratio of a dimension of the third recess along the first direction to a dimension of the main body part along the first direction is not less than 20% and not more than 70%.

17. The battery cell of any one of claims 7-15, wherein, The third recess is located in the main body part, and a ratio of a dimension of the third recess along the first direction to a dimension of the main body part along the first direction ranges from one third to 50%.

18. The battery cell of any one of claims 6-17, wherein, A dimension of the flow guide channel along the first direction ranges from 0.5 mm to 5 mm.

19. The battery cell of any one of claims 1 to 18, wherein, The mounting part protrudes from a surface of the main body part in a direction away from the accommodation cavity.

20. The battery cell of any one of claims 1-19, wherein, The mounting part is multiple, and each of the mounting parts is provided with the liquid injection hole.

21. The battery cell of any one of claims 1 to 19, wherein, The mounting part is multiple, and the flow guide channel communicates the accommodation cavities of at least two of the mounting parts, and the mounting part corresponding to at least one of the accommodation cavities communicated by the flow guide channel is provided with the liquid injection hole.

22. The battery cell of claim 21, wherein, The at least two accommodation cavities communicated by the flow guide channel are respectively arranged at one end of the first shell wall in a length direction.

23. The battery cell of any one of claims 1-22, wherein, The shell comprises a shell body and an end cover assembly, the shell body is open on one side in a first direction to form an opening, the end cover assembly covers the opening and cooperates with the shell body to form a mounting space, at least part of the electrode assembly is located in the mounting space, and at least part of the end cover assembly forms the first shell wall.

24. The battery cell of any one of claims 1-23, wherein, At least part of the flow guide channel extends along a length direction of the battery monomer.

25. The battery cell of any one of claims 1-24, wherein, A dimension of the flow guide channel along a spacing direction between the main body part and the electrode assembly ranges from 1 mm to 6 mm.

26. The battery cell of any one of claims 1-25, wherein, The battery monomer further comprises a pole column, the pole column penetrates the mounting part, part of the pole column is located in the accommodation cavity, the electrode assembly comprises a pole piece and a pole lug, the pole lug is located on a side of the pole piece close to the first shell wall, at least part of the pole lug is located in the accommodation cavity and electrically connected with the pole column.

27. A battery, wherein, The battery comprises the battery monomer of any one of claims 1 to 26.

28. An electrical device, comprising: The electric device comprises the battery of claim 27, and the battery is used to provide electric energy for the electric device.

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