Battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery and an electric device. The battery monomer comprises a shell and an electrode assembly, the shell is provided with a first shell wall and a liquid injection hole formed in the first shell wall, the first shell wall comprises a main body part and a mounting part, the inner wall of the mounting part is sunken to form a containing cavity, at least one mounting part is provided with the liquid injection hole, and the liquid injection hole is communicated with the exterior of the shell and the containing cavity; the electrode assembly is arranged in the shell; a diversion channel is arranged between the main body part and the electrode assembly and is communicated with the accommodating cavity. According to the battery monomer disclosed by the embodiment of the utility model, the additional flow guide channel is arranged, so that at least part of electrolyte accumulated in the accommodating cavity can be guided to other areas of the internal space of the shell, and the injection efficiency of the electrolyte is improved.

Description

Technical Field

[0001] Embodiments of the present utility model relate to the technical field of batteries, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] In a battery cell, an electrode assembly is provided, and the electrode assembly needs to be infiltrated by an electrolyte to enable an electrochemical reaction with the electrolyte to achieve the charging and discharging functions of the battery cell. Therefore, when manufacturing the battery cell, it is necessary to inject the electrolyte into the battery cell to infiltrate the electrode assembly.

[0003] In related technologies, a liquid injection hole is usually provided on the outer shell of the battery cell, and the electrolyte is injected into the battery cell through the liquid injection hole.

[0004] However, in order to reduce the space occupied by the battery cell, the structure of the battery cell is becoming more and more compact. After the electrolyte passes through the liquid injection hole, it is easily blocked by the electrode assembly and affected by the penetration rate of the electrolyte in the electrode assembly, which limits the injection flow rate of the electrolyte and has an adverse effect on the injection efficiency. Summary of the Utility Model

[0005] In view of this, embodiments of the present utility model are expected to provide a battery cell, a battery and an electrical device that can improve the electrolyte injection efficiency.

[0006] To achieve the above object, the technical solution of the embodiments of the present utility model is realized as follows:

[0007] Embodiments of the present utility model provide a battery cell, including:

[0008] An outer shell having a first shell wall and a liquid injection hole provided on the first shell wall. The first shell wall includes a main body portion and a mounting portion. An inner wall of the mounting portion is recessed to form a receiving cavity. At least one of the mounting portions is provided with the liquid injection hole, and the liquid injection hole communicates with the outside of the outer shell and the receiving cavity;

[0009] An electrode assembly disposed inside the outer shell;

[0010] Wherein, a diversion channel is formed between the main body portion and the electrode assembly, and the diversion channel communicates with the receiving cavity.

[0011] In the battery cell of the embodiment of the present utility model, by providing an additional flow guiding channel, the electrolyte accumulated in the accommodation cavity can be at least partially guided to other areas of the internal space of the outer shell, thereby increasing the penetration speed of the electrolyte in the electrode assembly, expanding the flow range of the electrolyte in the outer shell, reducing the probability of problems such as blocking the subsequent entry of the electrolyte and overflowing of the electrolyte from the outer shell due to excessive accumulation of the electrolyte in the accommodation cavity, improving the efficiency of electrolyte injection, facilitating increasing the flow rate of the injected electrolyte, and improving the production and manufacturing efficiency of the battery cell.

[0012] In some embodiments, a first groove is provided on the surface of the main body portion facing the electrode assembly, and the first groove is open towards the electrode assembly, and the first groove forms at least part of the flow guiding channel. In this way, the structure of the flow guiding channel can be simplified, so that the electrolyte can directly flow to other areas of the internal space of the outer shell under the guidance of the main body portion, and the structure of the battery cell is simplified.

[0013] In some embodiments, the battery cell further includes an insulating member, the insulating member is located between the first shell wall and the electrode assembly, and at least part of the flow guiding channel is located between the insulating member and the first shell wall. In this way, it is beneficial to simplify the structure of forming the flow guiding channel, reduce the probability of the cross-section of the flow guiding channel changing due to relative movement between the insulating member and the electrode assembly, and is beneficial to the flow guiding channel maintaining its cross-sectional size unchanged under different working conditions to meet the flow rate requirements of the electrolyte;

[0014] And / or, at least part of the flow guiding channel is located between the electrode assembly and the insulating member. In this way, it is beneficial to increase the contact area between the insulating member and the first shell wall, improve the insulation performance and the installation stability of the insulating member, is beneficial to simplify the structure of forming the flow guiding channel, reduce the probability of the cross-section of the flow guiding channel changing due to relative movement between the insulating member and the first shell wall, and is beneficial to the flow guiding channel maintaining its cross-sectional size unchanged under different working conditions to meet the flow rate requirements of the electrolyte.

[0015] In some embodiments, at least part of the flow guiding channel is formed by a space formed by a part of the insulating member and the electrode assembly being spaced apart. On the one hand, the flow guiding channel is formed by the space formed by the two being spaced apart. On the other hand, through the part where the two are in contact, it is beneficial to keep the relative positions of the two stable and reduce the adverse effect on the flow of the electrolyte in the flow guiding channel caused by the deformation of the flow guiding channel.

[0016] In some embodiments, a second groove is provided on a side of the insulating member facing the electrode assembly. The second groove is open on a side facing the electrode assembly, and the second groove forms at least part of the diversion channel. In this way, the structure of the second groove is simple and easy to manufacture, which is conducive to expanding the open area of the diversion channel, facilitating the electrolyte in the diversion channel to contact the electrode assembly more quickly, and improving the liquid injection efficiency.

[0017] In some embodiments, a part of the insulating member and the main body portion are spaced apart in a first direction to form at least part of the diversion channel. In this way, on the one hand, the space formed by the two being spaced apart forms the diversion channel, and on the other hand, through the part where the two are in contact, it is beneficial to keep the relative positions of the two stable and reduce the adverse effect of the deformation of the diversion channel on the flow of the electrolyte in the diversion channel.

[0018] In some embodiments, at least one of the surface of the main body portion facing the insulating member and the surface of the insulating member facing the main body portion is provided with a third groove. The third groove is open on one side in the first direction, and the third groove forms at least part of the diversion channel. In this way, the structure of the third groove can be formed by machining and manufacturing through the open position of the third groove, and its structure is simple and easy to manufacture.

[0019] In some embodiments, a part of the main body portion protrudes in a direction away from the electrode assembly in the first direction to form a first protrusion portion, and the third groove is formed on the other side. In this way, it is beneficial to increase the cross-sectional area of the third groove, which is conducive to meeting the flow rate requirement of the diversion channel; it is convenient to increase the thickness of the area of the main body portion provided with the third groove to improve the structural strength of the main body portion.

[0020] In some embodiments, the insulating member is provided with a second protrusion portion. The second protrusion portion protrudes in a direction away from the electrode assembly in the first direction and forms a receiving space on the other side. At least part of the second protrusion portion is disposed in the receiving cavity. The second protrusion portion is provided with a first through hole penetrating in the first direction, and the first through hole communicates with the liquid injection hole. The receiving space communicates with the third groove. In this way, through the second protrusion portion and the receiving space, it is beneficial to increase the layout space of the electrode assembly by allowing a part of the electrode assembly to enter the receiving space while meeting the insulating performance of the insulating member; the purpose of enabling the electrolyte to pass through the insulating member and contact the electrode assembly is achieved through the first through hole.

[0021] In some embodiments, a through second through-hole is provided on one side of the second protrusion perpendicular to the first direction. The second through-hole communicates with the third groove and the accommodation space. Both the first through-hole and the liquid injection hole extend along the first direction. The extending direction of the second through-hole is different from that of the first through-hole, so as to reduce the flow from the first through-hole into the second through-hole, such that the electrolyte can accumulate in the accommodation space before entering the second through-hole. At the same time, the probability of contact between the first housing wall and the electrode assembly through the second through-hole due to relative movement along the first direction is reduced.

[0022] In some embodiments, a transfer channel is formed at an interval between the inner wall of the accommodation cavity and the second protrusion along a second direction perpendicular to the first direction. The transfer channel communicates the second through-hole with the third groove. In this way, the transfer channel realizes the flow of the electrolyte from the second through-hole to the third groove, reducing the adverse effect on the liquid injection efficiency caused by the shielding of the electrolyte by the inner wall of the accommodation cavity.

[0023] In some embodiments, a third through-hole extending along the first direction is provided in the part of the insulating member outside the second protrusion. The third through-hole, the third groove and the second through-hole communicate with each other. In this way, the third through-hole forms an outlet of the diversion channel, enabling the electrolyte to come into contact with more areas of the electrode assembly, thus achieving the purpose of improving the liquid injection efficiency.

[0024] In some embodiments, in the projection perpendicular to the first direction, the ratio of the projected area of the third through-hole to the projected area of the first housing wall ranges from 10% to 50%. On the one hand, it is beneficial to ensure that the total cross-sectional area of the third through-hole meets the flow requirement of the electrolyte outflow. On the other hand, it is beneficial to meet the insulation performance requirement of the insulating member and also beneficial to ensure that the structural strength of the insulating member meets the requirement.

[0025] In some embodiments, the number of the third through-holes is multiple, and at least part of the third through-holes are arranged at intervals along the direction away from the accommodation cavity. This is beneficial to form multiple flow channels for the electrolyte to flow out, thereby reducing the probability of electrolyte accumulation in the third groove and improving the liquid injection efficiency.

[0026] 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 does not exceed 15 mm. This is beneficial to reducing 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, and is beneficial to improving the insulation performance of the insulating member.

[0027] In some embodiments, the third groove is located in the main body portion, and the ratio of the dimension of the third groove in the first direction to the dimension of the main body portion in the first direction is not less than 20% and not greater than 70%. In this way, it is beneficial for the cross-sectional area of the third groove to meet the flow requirement of the electrolyte, which is beneficial to improving the liquid injection efficiency; at the same time, it is also beneficial to meet the structural strength requirement of the main body portion.

[0028] In some embodiments, the third groove is located in the main body portion, and the ratio of the dimension of the third groove in the first direction to the dimension of the main body portion in the first direction ranges from one-third to 50%. In this way, it is more beneficial for the cross-sectional area of the third groove to meet the flow requirement of the electrolyte, which is beneficial to improving the liquid injection efficiency; at the same time, it is beneficial to meet the structural strength requirement of the main body portion.

[0029] In some embodiments, the dimension of the portion of the diversion channel located between the main body portion and the insulating member in the first direction ranges from 0.5 mm to 5 mm. In this way, it is beneficial for the cross-sectional area of the portion of the diversion channel located between the main body portion and the insulating member to meet the flow requirement of the electrolyte, which is beneficial to improving the liquid injection efficiency; at the same time, it is beneficial to meet the structural strength requirements of the insulating member and the main body portion.

[0030] In some embodiments, the mounting portion protrudes from the surface of the main body portion in a direction away from the accommodating cavity. In this way, the volume of the accommodating cavity is increased, and the probability of problems such as electrolyte overflow caused by excessive accumulation of electrolyte in the accommodating cavity is reduced; it is beneficial to make the thickness of the mounting portion and the main body portion consistent, so as to make the structure of the first shell wall more compact and beneficial to its structural lightweight.

[0031] In some embodiments, the number of the mounting portions is multiple, and each mounting portion is provided with the liquid injection hole. In this way, the electrolyte can be injected into the battery cell synchronously through multiple liquid injection holes, which is beneficial to increasing the total flow rate of the injected electrolyte and shortening the liquid injection time.

[0032] In some embodiments, the number of the mounting portions is multiple, the diversion channel communicates with the accommodating cavities of at least two of the mounting portions, and the mounting portion corresponding to at least one of the accommodating cavities communicated by the diversion channel is provided with the liquid injection hole. In this way, it is beneficial to further expand the flow range of the electrolyte in the outer shell; it is beneficial to reduce the number of liquid injection holes, which is beneficial to simplifying the manufacturing process of the outer shell and beneficial to improving the structural strength of the outer shell.

[0033] In some embodiments, at least two of the accommodating cavities communicated with the diversion channels are respectively arranged at one end of the first shell wall in the length direction. In this way, it is beneficial to further extend the length of the flow path of the electrolyte in the diversion channel, increase the capacity of the electrolyte that the diversion channel can accommodate, expand the flow range of the electrolyte, and further improve the liquid injection efficiency.

[0034] In some embodiments, the outer shell includes a shell body and an end cover assembly. One side of the shell body in the first direction is open to form an opening. The end cover assembly covers the opening and jointly encloses an installation space with the shell body. At least part of the electrode assembly is located in the installation space, and at least part of the end cover assembly forms the first shell wall. In this way, structures such as the accommodating cavity and the liquid injection hole are all located on the same component, which is convenient for these structures to be combined with the shell body after being manufactured on the end cover assembly synchronously, and is beneficial to improving the processing and assembly efficiency.

[0035] In some embodiments, at least part of the diversion channel extends along the length direction of the battery cell. In this way, it is beneficial to increase the size of the diversion channel, thereby increasing the flow range of the electrolyte.

[0036] In some embodiments, the size range of the diversion channel in the direction of the interval between the main body part and the electrode assembly is 1 mm to 6 mm. In this way, the cross-sectional size of the diversion channel can meet the flow requirement of the electrolyte.

[0037] In some embodiments, the battery cell further includes a pole column. The pole column penetrates through the installation part. A part of the pole column is located in the accommodating cavity. The electrode assembly includes a pole piece and a pole ear. The pole ear is located on the side of the pole piece close to the first shell wall. At least part of the pole ear is located in the accommodating cavity and is electrically connected to the pole column. In this way, it is beneficial to make the spatial shape inside the outer shell adapt to the outer contour shape of the electrode assembly, and beneficial to make the layout of each component in the battery cell more compact.

[0038] An embodiment of the present invention further provides a battery, and the battery includes the battery cell in any one of the foregoing embodiments. By adopting the foregoing battery cell to improve the liquid injection efficiency of the electrolyte, it is beneficial to improve the production and manufacturing efficiency of the battery.

[0039] An embodiment of the present invention further provides an electrical device, and the electrical device includes the battery in the foregoing embodiment. The battery is used to provide electrical energy for the electrical device. By improving the liquid injection efficiency of the electrolyte in the battery cell, it is beneficial to improve the production and manufacturing efficiency of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of an electrical device being a vehicle in an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of a battery in an embodiment of the present utility model;

[0042] Figure 3 Schematic diagram of a battery cell in the first embodiment of the present utility model;

[0043] Figure 4 is Figure 3 Schematic diagram of the embodiment in another perspective;

[0044] Figure 5 is Figure 3 Cross-sectional view at the A-A position in;

[0045] Figure 6 is Figure 5 Partial enlarged view at the B position in;

[0046] Figure 7 Schematic diagram of a battery cell in the second embodiment of the present utility model;

[0047] Figure 8 is Figure 7 Partial enlarged view at the C position in;

[0048] Figure 9 is Figure 7 Schematic diagram of the embodiment in another perspective;

[0049] Figure 10 is Figure 9 Partial enlarged view at the E position;

[0050] Figure 11 is Figure 7 Cross-sectional view at the D-D position in;

[0051] Figure 12 is Figure 11 Partial enlarged view at the F position in;

[0052] Figure 13 Partial enlarged view of a battery cell in the third embodiment of the present utility model, and the enlarged position is the same as the B position in Figure 5 ;

[0053] Figure 14 is Figure 13 Cross-sectional view of the embodiment in, and the cross-sectional position is the same as the D-D position in Figure 7 ;

[0054] Figure 15 is Figure 14 Partial enlarged view at the G position in;

[0055] Figure 16Schematic diagram of a battery cell in the fourth embodiment of the present utility model;

[0056] Figure 17 is Figure 16 Schematic diagram of the embodiment in from another perspective;

[0057] Figure 18 is Figure 16 Cross-sectional view at the H-H position in ;

[0058] Figure 19 is Figure 18 Partial enlarged view at the J position in ;

[0059] Figure 20 is Figure 17 Cross-sectional view at the I-I position in ;

[0060] Figure 21 is Figure 20 Partial enlarged view at the K position in ;

[0061] Figure 22 Partial enlarged view of a battery cell in the fifth embodiment of the present utility model, and the partial enlarged position is the same as the K position in Figure 20 ;

[0062] Figure 23 Partial enlarged view of a battery cell in the sixth embodiment of the present utility model, and the partial enlarged position is the same as the K position in Figure 20 ;

[0063] Figure 24 Schematic diagram of an insulating member in an embodiment of the present utility model;

[0064] Figure 25 is Figure 24 Partial enlarged view at the L position in .

[0065] Explanation of reference numerals

[0066] 1000, vehicle; 100, battery; 200, controller; 300, motor; 110, battery cell; 10, housing; 10a, liquid injection hole; 10b, flow guide channel; 10c, gap; 11, first housing wall; 111, main body; 111a, third groove; 111b, first groove; 1111, first protrusion; 112, mounting portion; 112a, accommodating cavity; 112b, switching channel 1. channel; 12. electrode assembly; 121. pole piece; 122. pole ear; 13. shell; 13a. installation space; 13b. opening; 14. end cover; 15. insulating member; 15a. second groove; 15b. third through hole; 151. second protrusion; 151a. first through hole; 151b. accommodating space; 151c. second through hole; 16. pole; 20. box; 21. top cover; 22. bottom cover. DETAILED DESCRIPTION

[0067] It should be noted that, in the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present invention and should not be regarded as an improper limitation on the present invention.

[0068] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification of the present invention and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0069] In the description of the embodiments of the present utility model, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present utility model, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0070] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0071] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0072] In the description of the embodiments of the present utility model, for the convenience of explanation, as Figure 4 , Figure 5 , Figure 7 , Figure 13 , Figure 14 and Figure 17 As shown by the arrows in , the direction where X is located is the "first direction" and the "length direction of the battery cell"; Figure 3 , Figure 4 , Figure 7 , Figure 9 , Figure 16 , Figure 17 and Figure 24 As shown by the arrow in , the direction where Y is located is the “second direction”.

[0073] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0074] In the description of the embodiments of the present utility model, unless otherwise clearly stipulated and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact or contact through an intermediate medium layer. It can be contact with essentially no interaction force between the two contacting parties, or it can be contact with interaction force between the two contacting parties.

[0075] At present, batteries are increasingly used in life and industry. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and aerospace and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0076] Figure 2 The following is a schematic diagram of a three-dimensional exploded view of a battery 100 provided in an embodiment of the present utility model. Figure 2As shown, the battery 100 includes a box body 20 and at least one battery cell 110.

[0077] The box body 20 includes a top cover 21 and a bottom cover 22. The top cover 21 covers above the bottom cover 22, thereby enclosing an installation space for placing the battery cell 110 between the bottom cover 22 and the top cover 21.

[0078] In the battery 100, there can be multiple battery cells 110. The multiple battery cells 110 can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 110. The multiple battery cells 110 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 110 is placed in the accommodation space formed by the bottom cover 22 and the top cover 21. Of course, the battery 100 can also be that multiple battery cells 110 are first connected in series, parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the accommodation space formed by the bottom cover 22 and the top cover 21. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 110.

[0079] In the embodiments of the present utility model, the battery cell 110 involved 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 relying on the movement of 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. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The current collector without the coated positive electrode active material layer protrudes from the current collector with the coated positive electrode active material layer. The current collectors without the coated positive electrode active material layer are stacked to form 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. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The current collector without the coated negative electrode active material layer protrudes from the current collector with the coated negative electrode active material layer. The current collectors without the coated negative electrode active material layer are stacked to form 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 wound structure or a stacked structure.

[0080] The battery cell 110 can be a secondary battery. A secondary battery refers to a battery cell 110 that can be activated by charging after discharging so as to continue to be used.

[0081] 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., or it can also be a solid-state battery. The embodiments of the present invention do not limit this.

[0082] The battery cell 110 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc. The embodiments of the present invention have no special limitations.

[0083] The battery 100 involved in the embodiments of the present invention refers to a single physical module that includes one or more battery cells 110 to provide a higher voltage and capacity.

[0084] The electrical device involved in the embodiments of the present invention is powered by the above battery. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0085] In the following embodiments, for the convenience of description, the electrical device of an embodiment of the present invention is taken as the vehicle 1000 as an example for description. The following is described with reference to the drawings.

[0086] Figure 1 It is a schematic structural diagram of the vehicle 1000 provided by an embodiment of the present invention. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As Figure 1 shown, the battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed 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 the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0087] In some embodiments of the present invention, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Next, a detailed description will be given of the embodiments of the present utility model.

[0089] In the related art, a battery cell includes a housing and an electrode assembly. The electrode assembly is disposed in the inner space of the housing. A liquid injection hole is provided on the housing, and the liquid injection hole communicates with the exterior and the inner space of the housing. During the manufacturing process of the battery cell, electrolyte is injected into the inner space of the housing through the liquid injection hole so that the electrolyte can infiltrate the electrode assembly.

[0090] 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 liquid injection hole and the electrode assembly closer and closer. Thus, during the liquid injection process, after the electrolyte flows out of the liquid 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 then block the subsequent electrolyte, which may cause the electrolyte to overflow from the liquid injection hole and also have an adverse effect on the injection flow rate of the electrolyte, affecting the production efficiency.

[0091] Based on the above technical problems, the embodiments of the present utility model aim to provide a battery cell. A part of the space inside the housing forms a receiving cavity. There is a diversion channel in the gap between the housing and the electrode assembly. Both the liquid injection hole and the diversion channel communicate with the receiving cavity, so that part of the electrolyte entering the receiving cavity can directly penetrate into the electrode assembly through the receiving cavity, and the other part enters the diversion channel and is guided to penetrate into other areas of the electrode assembly, thereby improving the liquid injection efficiency of the electrolyte.

[0092] Specifically, referring to Figures 3 to 5 , the embodiments of the present utility model provide a battery cell 110, which includes a housing 10 and an electrode assembly 12.

[0093] The housing 10 has a first housing wall 11 and a liquid injection hole 10a provided on the first housing wall 11. The first housing wall 11 includes a main body portion 111 and a mounting portion 112. The inner wall of the mounting portion 112 is recessed to form a receiving cavity 112a. At least one mounting portion 112 is provided with a liquid injection hole 10a, and the liquid injection hole 10a communicates with the exterior of the housing 10 and the receiving cavity 112a.

[0094] The electrode assembly 12 is disposed inside the housing 10.

[0095] There is a diversion channel 10b between the main body portion 111 and the electrode assembly 12, and the diversion channel 10b communicates with the receiving cavity 112a.

[0096] A plurality of housing walls enclose to form the housing 10 and form a space inside for arranging the electrode assembly 12. The outer surface of the housing wall forms at least part of the outer surface of the battery cell 110.

[0097] The first cell wall 11 refers to the cell wall among the multiple cell walls forming the outer shell 10 that is provided with the liquid injection hole 10a.

[0098] The liquid injection hole 10a penetrates through the first cell wall 11 to connect the outside and the inside of the outer shell 10, so that the electrolyte can enter the internal space of the outer shell 10 through the liquid injection hole 10a.

[0099] The inner wall of the installation part 112 is recessed, which means that the surface of the installation part 112 facing the electrode assembly 12 and the surface of the main body part 111 facing the electrode assembly 12 are offset along the relative direction of the first cell wall 11 and the electrode assembly 12, so that the distance between the surface of the installation part 112 facing the electrode assembly 12 and the electrode tab 121 of the electrode assembly 12 is greater than the distance between the surface of the main body part 111 facing the electrode assembly 12 and the electrode tab 121 of the electrode assembly 12.

[0100] The space in the accommodation cavity 112a is a part of the internal space of the outer shell 10, and the side of the accommodation cavity 112a facing the electrode assembly 12 is open to connect to other parts of the internal space of the outer shell 10.

[0101] The liquid injection hole 10a is communicated with the accommodation cavity 112a, so that after flowing out of the liquid injection hole 10a of the electrolyte, it enters other parts of the internal space of the outer shell 10 through the open position of the accommodation cavity 112a and then penetrates into the electrode assembly 12.

[0102] It can be understood that due to the blockage of the electrode assembly 12 and the influence of the penetration speed of the electrolyte in the electrode assembly 12, part of the electrolyte will accumulate in the accommodation cavity 112a.

[0103] The diversion channel 10b is communicated with the part of the internal space of the outer shell 10 facing the main body part 111, and the diversion channel 10b is communicated with the accommodation cavity 112a, so that part of the electrolyte accumulated in the accommodation cavity 112a can enter the diversion channel 10b, and further enter the part of the internal space of the outer shell 10 facing the main body part 111 through the open part of the diversion channel 10b, and then penetrate into other parts of the electrode assembly 12. In the battery cell 110 of the embodiment of the present invention, by providing an additional diversion channel 10b, at least part of the electrolyte accumulated in the accommodation cavity 112a can be guided to other areas of the internal space of the outer shell 10, thereby increasing the penetration speed of the electrolyte in the electrode assembly 12, expanding the flow range of the electrolyte in the outer shell 10, reducing the probability of problems such as blocking the subsequent electrolyte from entering and the electrolyte overflowing from the outer shell 10 due to excessive accumulation of the electrolyte in the accommodation cavity 112a, improving the efficiency of electrolyte injection, being beneficial to increasing the flow rate of the injected electrolyte, and improving the production and manufacturing efficiency of the battery cell 110.

[0104] It can be understood that at least a part of the inner wall of the diversion channel 10b facing the electrode assembly 12 is open, so as to achieve the purpose of connecting the diversion channel 10b with other areas of the inner space of the housing 10.

[0105] Refer to Figure 6 , a gap 10c is formed between the main body portion 111 and the electrode assembly 12 at intervals, and the gap 10c forms at least a part of the diversion channel 10b. By using the space of the gap 10c formed by the interval between the electrode assembly 12 and the main body portion 111, the diversion channel 10b is arranged in the gap 10c. The open position of the diversion channel 10b communicates with the part of the inner space of the housing 10 facing the main body portion 111. Moreover, the diversion channel 10b communicates with the accommodating cavity 112a, so that a part of the electrolyte accumulated in the accommodating cavity 112a can enter the diversion channel 10b, and further enter the part of the inner space of the housing 10 facing the main body portion 111 through the open part of the diversion channel 10b, and then penetrate into other parts of the electrode assembly 12.

[0106] The specific number of the mounting portions 112 is not limited, and can be one or more. Correspondingly, the number of the liquid injection holes 10a can be one or more.

[0107] At least one mounting portion 112 is provided with a liquid injection hole 10a, which means that there can be only one mounting portion 112 provided with the liquid injection hole 10a, or multiple mounting portions 112 are provided with the liquid injection hole 10a.

[0108] It can be understood that the diversion channel 10b can be a part of the space of the gap 10c, or can be formed by being surrounded by other structures in the battery cell 110 in the gap 10c.

[0109] In some embodiments, refer to Figure 6 , a first groove 111b is provided on the surface of the main body portion 111 facing the electrode assembly 12. The side of the first groove 111b facing the electrode assembly 12 is open, and the first groove 111b forms at least a part of the diversion channel 10b.

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

[0111] In this way, the structure of the diversion channel 10b can be simplified, so that the electrolyte can directly flow to other areas of the inner space of the housing 10 under the guidance of the main body portion 111, and the structure of the battery cell 100 is simplified.

[0112] In some embodiments, the outer casing 10 is made of a metal material. In this way, on the one hand, the outer casing 10 has relatively high structural strength; on the other hand, due to the ductility of the metal, it is convenient to form the outer casing 10 in one piece by processes such as stamping, thereby simplifying the manufacturing steps and improving the production efficiency.

[0113] In embodiments where the outer casing 10 is made of a metal material, the outer casing 10 has electrical conductivity. Therefore, it is necessary to reduce the probability of contact between the electrode assembly 12 and the outer casing 10 to reduce the risk of short circuit caused by their electrical connection.

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

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

[0116] In some embodiments provided with the insulating member 15, referring to Figures 16 to 23 , at least a part of the flow guiding channel 10b is located between the insulating member 15 and the first housing wall 11. That is to say, the flow guiding channel 10b is jointly formed by enclosing between the insulating member 15 and the first housing wall 11.

[0117] In this way, it is beneficial to simplify the structure of forming the flow guiding channel 10b, reduce the probability that the cross-section of the flow guiding channel 10b changes due to relative movement between the insulating member 15 and the electrode assembly 12, and is beneficial to keeping the cross-section size of the flow guiding channel 10b unchanged under different working conditions to meet the flow rate requirements of the electrolyte.

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

[0119] In some embodiments provided with the insulating member 15, at least a part of the flow guiding channel 10b is located inside the insulating member 15. That is to say, at least a part of the flow guiding channel 10b is formed by enclosing alone by the insulating member 15, and at least a part of the flow guiding channel 10b is the internal channel of the insulating member 15.

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

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

[0122] That is to say, the diversion channel 10b is jointly formed by enclosing the electrode assembly 12 and the insulating member 15.

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

[0124] In some embodiments with multiple diversion channels 10b, one diversion channel 10b is located between the electrode assembly 12 and the insulating member 15, and the other diversion channel 10b is located between the insulating member 15 and the first housing wall 11, so that the two diversion channels 10b can backup each other to better meet the flow demand of the electrolyte.

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

[0126] In some embodiments, referring to Figures 13 to 15 , at least part of the diversion channel 10b is formed by a space formed by a part of the insulating member 15 being spaced apart from the electrode assembly 12. That is to say, another part of the insulating member 15 abuts against the electrode assembly 12.

[0127] In this way, on the one hand, the diversion channel 10b is formed by the space formed by the two being spaced apart, and on the other hand, through the abutting part of the two, it is beneficial to keep the relative positions of the two stable and reduce the adverse effect on the flow of the electrolyte in the diversion channel 10b caused by the deformation of the diversion channel 10b.

[0128] In some embodiments, referring to Figure 15 , a second groove 15a is provided on the side of the insulating member 15 facing the electrode assembly 12. The second groove 15a is open on the side facing the electrode assembly 12, and the second groove 15a forms at least part of the diversion channel 10b.

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

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

[0131] Thus, the structure of the second groove 15a is simple and easy to manufacture, which is beneficial to expanding the open area of the diversion channel 10b, facilitating the electrolyte in the diversion channel 10b to contact the electrode assembly 12 more quickly, and improving the liquid injection efficiency.

[0132] It can be understood that in the embodiment where the insulating member 15 is made of a plastic material through an injection molding process, the second groove 15a can be formed by demolding through the open position of the second groove 15a, which is beneficial to the one-time molding of the second groove 15a and improves the production efficiency.

[0133] In some embodiments, the second groove 15a is open on both sides along the relative direction of the first housing wall 11 and the electrode assembly 12, and the second groove 15a forms at least a part of the diversion channel 10b. Thus, it is beneficial to make more full use of the space of the gap 10c, expand the cross-sectional area of the second groove 15a, and increase the upper limit of the flow rate of the electrolyte in the second groove 15a.

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

[0135] In some embodiments, refer to Figures 21 to 23 , a part of the insulating member 15 is spaced apart from the main body portion 111 in the first direction to form at least a part of the diversion channel 10b. That is to say, another part of the insulating member 15 abuts against the first housing wall 11.

[0136] Thus, on the one hand, the space formed by the two being spaced apart is used to form the diversion channel 10b, and on the other hand, through the abutting part of the two, it is beneficial to keep the relative positions of the two stable and reduce the adverse effect on the flow of the electrolyte in the diversion channel 10b caused by the deformation of the diversion channel 10b.

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

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

[0139] Refer to Figure 19 , Figure 20 and Figure 21 , it may be that only the surface of the main body portion 111 facing the insulating member 15 is provided with the third groove 111a, and the third groove 111a is open on the side facing the insulating member 15 along the first direction; refer to Figure 22, only the surface of the insulating member 15 facing the main body 111 may be provided with a third groove 111a, and the third groove 111a is open along the first direction toward one side of the main body 111; see Figure 23 Alternatively, the surface of the main body 111 facing the insulating member 15 and the surface of the insulating member 15 facing the main body 111 may both be provided with third grooves 111a, that is, the number of third grooves 111a is two, one of which is open toward the side of the insulating member 15, and the other is open toward the side of the main body 111, and the open positions of the two third grooves 111a are connected to each other.

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

[0141] It is understood that in the embodiment where the main body 111 is provided with the third groove 111a, see Figure 21 and Figure 23 The area of the main body 111 where the third groove 111 a is formed is thinner along the thickness dimension than other areas.

[0142] In some embodiments, see Figures 8 to 12 A portion of the main body 111 protrudes along the first direction toward a side away from the electrode assembly 12 to form a first protrusion 1111, and a third groove 111a is formed on the other side.

[0143] This is beneficial to increasing the cross-sectional area of the third groove 111 a and meeting the flow demand of the guide channel 10 b ; it is convenient to increase the thickness of the area of the main body 111 where the third groove 111 a is provided, so as to improve the structural strength of the main body 111 .

[0144] Stamping can be used to deform a portion of the main body 111 to simultaneously form the first protrusion 1111 and the third groove 111a, so as to improve production efficiency and also facilitate the consistency of the dimensions of various regions of the main body 111 along the reverse direction of its thickness.

[0145] The thickness of the main body 111 refers to the thickness of the main body 111 along the direction where the main body 111 and the insulating member 15 are opposite to each other, that is, the first direction.

[0146] See also Figure 8 and Figure 10 In some embodiments where the mounting portion 112 protrudes from the main body portion 111 , the first protrusion 1111 is connected to the mounting portion 112 to further improve the structural strength of the housing 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] See also Figure 9In the embodiment where the two mounting portions 112 are respectively located at one end of the shell 10 along the length direction and protrude from the main body 111, the first protrusion 1111 extends along the length direction and connects the two mounting portions 112, which is beneficial to further improve the bending resistance of the battery cell 110.

[0149] In some embodiments, see Figure 18 , Figure 19 and Figure 25 The insulating member 15 is provided with a second protrusion 151, which protrudes along the first direction toward a side away from the electrode assembly 12 and forms a receiving space 151b on the other side. At least a portion of the second protrusion 151 is disposed in the receiving cavity 112a. The second protrusion 151 is provided with a first through hole 151a extending along the first direction. The first through hole 151a is communicated with the injection hole 10a, and the receiving space 151b is communicated with the third groove 111a.

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

[0151] In this way, through the second protrusion 151 and the accommodating space 151b, it is beneficial to allow a part of the electrode assembly 12 to enter the accommodating space 151b while meeting the insulation performance of the insulating part 15, thereby increasing the layout space of the electrode assembly 12; the purpose of the electrolyte passing through the insulating part 15 and contacting with the electrode assembly 12 is achieved through the first through hole 151a.

[0152] In some embodiments, see Figure 19 The first through hole 151a and the 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 injection hole 10a, and to improve the injection flow rate of the electrolyte.

[0153] The first protrusion 1111 may be in contact with the inner wall of the accommodating cavity 112a along the first direction so that the electrolyte flowing out from the injection hole 10a mainly flows directly to the first through hole 151a; or it may be spaced from the inner wall of the accommodating cavity 112a along the first direction, and part of the electrolyte flowing out from the injection hole 10a enters the third groove 111a through the space formed by the interval between the inner wall of the accommodating cavity 112a and the first protrusion 1111.

[0154] In some embodiments, both the first through hole 151a and the injection hole 10a extend along the first direction. Figure 19 ,Figure 24 and Figure 25 On one side of the second protrusion 151 perpendicular to the first direction, there is a through second through hole 151c, and the second through hole 151c communicates with the third groove 111a and the accommodation space 151b.

[0155] The extending direction of the second through hole 151c is different from that of the first through hole 151a, so as to reduce the flow from the first through hole 151a and then into the second through hole 151c, so that the electrolyte can accumulate in the accommodation space 151b before entering the second through hole 151c; at the same time, the probability of contact between the first housing wall 11 and the electrode assembly 12 due to relative movement in the first direction through the second through hole 151c is reduced.

[0156] It can be understood that referring to Figure 19 , the second through hole 151c faces the inner wall of one side of the accommodation cavity 112a perpendicular to the first direction.

[0157] In some embodiments, referring to Figure 19 , a transfer channel 112b is formed at an interval between the inner wall of the accommodation cavity 112a and the second protrusion 151 along the second direction, the first direction is perpendicular to the second direction, and the transfer channel 112b communicates the second through hole 151c with the third groove 111a.

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

[0159] In this way, the transfer channel 112b realizes the flow of the electrolyte from the second through hole 151c to the third groove 111a, and reduces the adverse effect on the liquid injection efficiency due to the shielding of the inner wall of the accommodation cavity 112a on the electrolyte.

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

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

[0162] In some embodiments, referring to Figure 19 , Figures 21 to 23 and Figure 24 , a third through hole 15b penetrating along the first direction is provided in the part of the insulating member 15 outside the second protrusion 151, and the third through hole 15b, the third groove 111a and the second through hole 151c communicate with each other.

[0163] The electrolyte 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 is understandable that the third groove 111a and the third through-hole 15b jointly form at least part of the diversion channel 10b. The third through-hole 15b forms an open part of the diversion channel 10b on the side facing the electrode assembly 12.

[0165] In this way, by realizing that the third through-hole 15b forms the outlet of the diversion channel 10b, the electrolyte can come into contact with more areas of the electrode assembly 12, achieving the purpose of improving the liquid injection efficiency.

[0166] In some embodiments, in the projection perpendicular to the first direction, the ratio range of the projected area of the third through-hole 15b to the projected area of the first housing wall 11 is 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 requirement of the electrolyte outflow; on the other hand, it is beneficial to meet the insulation performance requirements of the insulating member 15 and also beneficial to make the structural strength of the insulating member 15 meet the requirements.

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

[0169] In some embodiments, referring to Figure 18 and Figure 24 , the number of the third through-holes 15b is multiple, and at least part of the third through-holes 15b are arranged at intervals along the 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, and further beneficial to reduce the probability of the electrolyte accumulating in the third groove 111a and improve the liquid injection efficiency.

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

[0172] In the projection plane perpendicular to the first direction, the specific shape of the projected contour of the third through-hole 15b is not limited. For example, it can be circular, rectangular, etc.

[0173] 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 15b does not exceed 15 mm (millimetre).

[0174] In this way, it is beneficial to reduce the probability of the electrode assembly 12 moving through the third through-hole 15b and coming into contact with the main body, and beneficial to improve the insulation performance of the insulating member 15.

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

[0176] In some embodiments, the third groove 111a is located in the main body portion 111. The ratio of the dimension of the third groove 111a in the first direction to the dimension of the main body portion 111 in the first direction is not less than 20% and not greater than 70%. That is, referring to Figure 21 , 20% ≤ L1 / L3 ≤ 70%.

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

[0178] In some embodiments, the third groove 111a is located in the main body portion 111. The ratio range of the dimension of the third groove 111a in the first direction to the dimension of the main body portion 111 in the first direction is one-third to 50%. That is, referring to Figure 21 , 1 / 3 ≤ L1 / L3 ≤ 50%.

[0179] In this way, it is more beneficial for the cross-sectional area of the third groove 111a to meet the flow requirement of the electrolyte, which is beneficial to improving the liquid injection efficiency; at the same time, it is beneficial to meet the structural strength requirement of the main body portion 111.

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

[0181] In some embodiments, the dimension range of the portion of the diversion channel 10b located between the main body portion 111 and the insulating member 15 in the first direction is 0.5mm to 5mm. That is, 0.5mm ≤ L1 ≤ 5mm.

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

[0183] In this way, it is beneficial for the cross-sectional area of the portion of the diversion channel 10b located between the main body portion 111 and the insulating member 15 to meet the flow requirement of the electrolyte, which is beneficial to improving the liquid injection efficiency; at the same time, it is beneficial to meet the structural strength requirements of the insulating member 15 and the main body portion 111.

[0184] The dimension of the part of the diversion channel 10b between the main body 111 and the insulating member 15 along the first direction can specifically 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, etc.

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

[0186] In this way, 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; it is beneficial to make the thickness of the mounting portion 112 and the main body 111 consistent, so that the structure of the first housing wall 11 is more compact and beneficial to the lightweight of its structure.

[0187] There is no limit to the specific manufacturing method of the mounting portion 112 and the main body 111. For example, a blank part of the first housing wall 11 is stamped. The recessed part after stamping forms the mounting portion 112, and the non-recessed part is the main body 111. Using the stamping process is beneficial to improving production efficiency.

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

[0189] In this way, the electrolyte can be injected into the battery cell 110 synchronously through multiple liquid injection holes 10a, which is beneficial to increasing the total flow rate of the injected electrolyte and shortening the liquid injection time.

[0190] In some other embodiments where the number of the mounting portions 112 is multiple, referring to Figure 5 , the diversion channel 10b communicates with the accommodation cavities 112a of at least two mounting portions 112, and at least one of the accommodation cavities 112a communicated with by the diversion channel 10b corresponds to a mounting portion 112 provided with a liquid injection hole 10a.

[0191] After the electrolyte enters one accommodation cavity 112a from the liquid injection hole 10a, for the electrolyte entering the diversion channel 10b, a part of it directly flows out of the diversion channel 10b through the open position of the diversion channel 10b; another part flows into the accommodation cavity 112a in another mounting portion 112 along the diversion channel 10b.

[0192] Thus, it is beneficial to further expand the flow range of the electrolyte within the outer casing 10; beneficial to reduce the number of liquid injection holes 10a, beneficial to simplify the manufacturing process of the outer casing 10, and beneficial to improve the structural strength of the outer casing 10.

[0193] In some embodiments where the number of the mounting portions 112 is multiple, refer to Figure 5 , at least two accommodating cavities 112a communicated with the diversion channel 10b are respectively disposed at one end of the first shell wall 11 in its length direction.

[0194] The length direction of the first shell wall 11 refers to the straight line direction where the largest dimension among the three-dimensional dimensions of the first shell wall 11 is located.

[0195] The two accommodating cavities 112a are respectively disposed at one end of the first shell wall 11 in its length direction, so that the distance between the two accommodating cavities 112a is increased as much as possible.

[0196] Thus, it is beneficial to further extend the length of the flow path of the electrolyte in the diversion channel 10b, beneficial to increase the capacity of the electrolyte that the diversion channel 10b can accommodate, beneficial to expand the flow range of the electrolyte, and further improve the liquid injection efficiency.

[0197] The number of the diversion 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] Exemplarily, refer to Figure 4 and Figure 5 , the outer casing 10 includes a housing 13 and an end cap 14 assembly. One side of the housing 13 along the first direction is open to form an opening 13b. The end cap 14 assembly seals the opening 13b and jointly encloses with the housing 13 to form an installation space 13a. At least part of the electrode assembly 12 is located within the installation space 13a, and at least part of the end cap 14 assembly forms the first shell wall 11.

[0200] Thus, structures such as the accommodating cavity 112a and the liquid injection hole 10a are all located on the same component, facilitating the cooperation of these structures with the housing 13 to form the outer casing 10 after the end cap 14 assembly is manufactured, which is beneficial to improve the processing and assembly efficiency.

[0201] In some embodiments, refer to Figure 3 and Figure 5 , at least part of the diversion channel 10b extends along the length direction of the battery cell 110.

[0202] The length direction of the battery cell 110 is the straight line direction where the largest dimension among the three-dimensional dimensions of the battery cell 110 is located.

[0203] Thus, it is beneficial to increase the size of the extended diversion channel 10b, thereby increasing the electrolyte flow range.

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

[0205] In some embodiments, the size range of the diversion channel 10b in the direction of the interval between the main body portion 111 and the electrode assembly 12 is 1 mm to 6 mm. Refer to Figure 6 , 1 mm ≤ L3 ≤ 6 mm.

[0206] Thus, the cross-sectional size of the diversion channel 10b can meet the flow rate requirements of the electrolyte.

[0207] In some embodiments, refer to Figure 6 and Figure 19 , the battery cell 110 further includes a terminal post 16, the terminal post 16 penetrates through the mounting portion 112, a part of the terminal post 16 is located in the accommodation cavity 112a, the electrode assembly 12 includes a pole piece 121 and a tab 122, the tab 122 is located on the side of the pole piece 121 close to the first housing wall 11, and at least a part of the tab 122 is located in the accommodation cavity 112a and is electrically connected to the terminal post 16.

[0208] Thus, it is beneficial to make the spatial shape inside the housing 10 adapt to the outer contour shape of the electrode assembly 12, and it is beneficial to make the arrangement of each component in the battery cell 110 more compact.

[0209] A specific embodiment of a battery cell 110 of the present utility model is as follows:

[0210] The battery cell 110 includes an end cap 14 assembly, a housing 13, an insulating member 15, an electrode assembly 12, and a terminal 16. One side of the housing 13 along the first direction is open to form an opening 13b. The end cap 14 assembly covers the opening 13b and together with the housing 13 encloses an installation space 13a. At least part of the electrode assembly 12 is located in the installation space 13a. The end cap 14 assembly includes a main body portion 111 and an installation portion 112. The inner wall of the installation portion 112 is recessed to form a receiving cavity 112a. At least one installation portion 112 is provided with a liquid injection hole 10a. The liquid injection hole 10a communicates the outside of the outer shell 10 with the receiving cavity 112a. The installation portion 112 protrudes from the surface of the main body portion 111 in a direction away from the receiving cavity 112a. The insulating member 15 is located between the end cap 14 assembly and the electrode assembly 12. A part of the main body portion 111 protrudes toward the side away from the electrode assembly 12 along the first direction to form a first protrusion portion 1111, and a third groove 111a is formed on the other side. The third groove 111a is open toward the insulating member 15. The insulating member 15 is provided with a second protrusion portion 151. The second protrusion portion 151 protrudes toward the side away from the electrode assembly 12 along the first direction and forms a receiving space 151b on the other side. At least part of the second protrusion portion 151 is disposed in the receiving cavity 112a. The second protrusion portion 151 is provided with a first through hole 151a penetrating along the first direction. The first through hole 151a communicates with the liquid injection hole 10a. The receiving space 151b communicates with the third groove 111a. One side of the second protrusion portion 151 perpendicular to the first direction is provided with a through second through hole 151c. The second through hole 151c communicates the third groove 111a and the receiving space 151b. The first through hole 151a and the liquid injection hole 10a both extend along the first direction. A transfer channel 112b is formed at an interval between the inner wall of the receiving cavity 112a and the second protrusion portion 151 along the second direction. The first direction is perpendicular to the second direction. The transfer channel 112b communicates the second through hole 151c with the third groove 111a. The part of the insulating member 15 located outside the second protrusion portion 151 is provided with a third through hole 15b penetrating along the first direction. The third through hole 15b, the third groove 111a, and the second through hole 151c communicate with each other. The number of the installation portions 112 is two. The two installation portions 112 are respectively disposed at one end of the end cap 14 assembly in the length direction. The third groove 111a extends along the length direction of the end cap 14 assembly and communicates with the receiving cavities 112a of the two mounting seats respectively. The number of the third through holes 15b is multiple. At least part of the third through holes 15b are arranged at intervals in a direction away from the receiving cavity 112a. In the projection perpendicular to the first direction, the ratio range of the projected area of the third through hole 15b to the projected area of the end cap 14 assembly is 10% to 50%. In the projection plane perpendicular to the first direction, the diameter of the inscribed circle of the contour of the third through hole 15b does not exceed 15 mm. The ratio range of the dimension of the third groove 111a along the first direction to the dimension of the main body portion 111 along the first direction is one-third to 50%.

[0211] The implementation of the present utility model also provides a battery, which includes the battery cell 110 in any of the foregoing embodiments. By adopting the foregoing battery cell 110, the liquid injection efficiency of the electrolyte is improved, which is beneficial to improving the production and manufacturing efficiency of the battery.

[0212] The implementation of the present utility model also provides an electrical device, which includes the battery in the foregoing embodiment. By improving the liquid injection efficiency of the electrolyte in the battery cell 110, it is beneficial to improve the production and manufacturing efficiency of the electrical device.

[0213] The various embodiments / implementation manners provided by the present utility model can be combined with each other without contradiction.

[0214] The foregoing are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a first housing wall and a liquid injection hole provided in the first housing wall. The first housing wall includes a main body portion and a mounting portion. An inner wall of the mounting portion is recessed to form a receiving cavity. At least one of the mounting portions is provided with the liquid injection hole, and the liquid injection hole communicates the outside of the housing with the receiving cavity; An electrode assembly provided in the housing; Wherein, there is a diversion channel between the main body portion and the electrode assembly, and the diversion channel communicates with the receiving cavity.

2. The battery cell according to claim 1, wherein A first groove is provided on a surface of the main body portion facing the electrode assembly. The first groove is open on a side facing the electrode assembly, and the first groove forms at least a part of the diversion channel.

3. The battery cell according to claim 1, wherein, The battery cell further includes an insulating member located between the first housing wall and the electrode assembly, and at least a part of the diversion channel is located between the insulating member and the first housing wall; And / or, at least a part of the diversion channel is located between the electrode assembly and the insulating member.

4. The battery cell according to claim 3, characterized in that, A part of the insulating member is spaced from the electrode assembly to form at least a part of the diversion channel.

5. The battery cell according to claim 4, wherein A second groove is provided on a side of the insulating member facing the electrode assembly. The second groove is open on a side facing the electrode assembly, and the second groove forms at least a part of the diversion channel.

6. The battery cell according to claim 3, wherein A part of the insulating member is spaced from the main body portion in a first direction to form at least a part of the diversion channel.

7. The battery cell according to 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 groove. The third groove is open on a side along the first direction, and the third groove forms at least a part of the diversion channel.

8. The battery cell according to claim 7, wherein A part of the main body portion protrudes in a direction away from the electrode assembly in the first direction to form a first protrusion portion, and the third groove is formed on the other side.

9. The battery cell according to claim 7, characterized in that, The insulating member is provided with a second protrusion portion. The second protrusion portion protrudes in a direction away from the electrode assembly in the first direction and forms a receiving space on the other side. At least a part of the second protrusion portion is provided in the receiving cavity. The second protrusion portion is provided with a first through hole penetrating along the first direction. The first through hole communicates with the liquid injection hole, and the receiving space communicates with the third groove.

10. The battery cell according to claim 9, characterized in that, A through second through hole is provided on a side of the second protrusion portion perpendicular to the first direction. The second through hole communicates the third groove and the receiving space, and both the first through hole and the liquid injection hole extend along the first direction.

11. The battery cell according to claim 10, characterized in that, A transfer channel is formed by spacing between an inner wall of the receiving cavity and the second protrusion portion in a second direction. The first direction is perpendicular to the second direction, and the transfer channel communicates the second through hole with the third groove.

12. The battery cell according to claim 10, wherein A third through hole penetrating along the first direction is provided in a part of the insulating member outside the second protrusion portion. The third through hole, the third groove, and the second through hole communicate with each other.

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

14. The battery cell according to claim 12, wherein The number of the third through holes is multiple, and at least part of the third through holes are arranged at intervals in a direction away from the accommodation cavity.

15. The battery cell according to claim 12, characterized in that, In a projection plane perpendicular to the first direction, the diameter of the inscribed circle of the contour of the third through hole does not exceed 15 mm.

16. The battery cell according to claim 7, wherein, The third groove is located in the main body portion, and the ratio of the dimension of the third groove in the first direction to the dimension of the main body portion in the first direction is not less than 20% and not greater than 70%.

17. The battery cell according to claim 7, characterized in that, The third groove is located in the main body portion, and the ratio of the dimension of the third groove in the first direction to the dimension of the main body portion in the first direction ranges from one-third to 50%.

18. The battery cell according to claim 6, characterized in that, The dimension range of the portion of the diversion channel located between the main body portion and the insulating member in the first direction is 0.5 mm to 5 mm.

19. The battery cell according to claim 1, characterized in that, The mounting portion protrudes from the surface of the main body portion in a direction away from the accommodation cavity.

20. The battery cell according to claim 1, characterized in that, The number of the mounting portions is multiple, and each mounting portion is provided with the liquid injection hole.

21. The battery cell according to claim 1, characterized in that, The number of the mounting portions is multiple, the diversion channel communicates with the accommodation cavities of at least two of the mounting portions, and at least one of the accommodation cavities communicated with by the diversion channel corresponds to a mounting portion provided with the liquid injection hole.

22. The battery cell according to claim 21, characterized in that, At least two of the accommodation cavities communicated with by the diversion channel are respectively arranged at one end of the first shell wall in the length direction.

23. The battery cell according to claim 1, characterized in that, The outer shell includes a housing and an end cover assembly. One side of the housing in the first direction is open to form an opening. The end cover assembly covers the opening and jointly encloses an installation space with the housing. At least part of the electrode assembly is located in the installation space, and at least part of the end cover assembly forms the first shell wall.

24. The battery cell according to claim 1, characterized in that, At least part of the diversion channel extends along the length direction of the battery cell.

25. The battery cell according to claim 1, wherein, The dimension range of the diversion channel in the direction of the interval between the main body portion and the electrode assembly is 1 mm to 6 mm.

26. The battery cell according to claim 1, wherein The battery cell further includes a pole column. The pole column penetrates through the mounting portion. A part of the pole column is located in the accommodation cavity. The electrode assembly includes a pole piece and a pole ear. The pole ear is located on one side of the pole piece close to the first shell wall. At least part of the pole ear is located in the accommodation cavity and is electrically connected to the pole column.

27. A battery, characterized in that, The battery includes the battery cell according to any one of claims 1 to 26.

28. An electrical device, characterized in that, The electrical device includes the battery according to claim 27, and the battery is used to provide electrical energy for the electrical device.

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