Battery monomer, battery and electric device

Abstract

The invention relates to a battery monomer, a battery and a power utilization device. The battery cell comprises: a housing having an end portion arranged in an axial direction, the end portion being provided with a mounting hole; the flow collecting disc comprises a main body part and a mounting part, the main body part is arranged in the shell, a liquid injection hole is formed in the main body part, the mounting part protrudes out of the side, facing the end part, of the main body part, and the mounting part penetrates through the mounting hole and is in sealed connection with the end part; and the orthographic projection of the mounting hole on the main body part along the axial direction of the shell covers at least part of the liquid injection hole. According to the battery monomer, the battery and the power utilization device provided by the invention, the structure of the battery monomer can be simplified, the assembly error of the battery monomer is increased, and the risk of neglected assembly can be reduced.

Description

Technical Field

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

[0002] In recent years, the new energy industry has received more and more attention. As an important part of the new energy industry, batteries occupy a large share of the market. Batteries are formed by multiple battery cells connected in series, parallel or mixed.

[0003] Taking the battery cell as a cylindrical battery cell as an example, the cylindrical battery cell is usually provided with a liquid injection hole at the end of the shell or on the current collecting plate. After the liquid injection is completed, a sealing element is required to seal the liquid injection hole to prevent leakage during the assembly of the cylindrical battery cell. The form of independently setting the sealing element is not only complex in structure and increases the assembly error of the cylindrical battery cell, but also there is a risk of leakage due to missing sealing elements during the assembly process. Summary of the invention

[0004] Based on this, it is necessary to provide a battery cell, a battery and an electrical device that can simplify the battery cell structure, increase the assembly error of the battery cell and reduce the risk of missing assembly in order to solve the above problems.

[0005] In one aspect, the present application provides a battery cell, characterized in that the battery cell comprises:

[0006] The housing has an end portion arranged along its axial direction, and a mounting hole is formed on the end portion; and

[0007] The collecting plate comprises a main body and a mounting part, wherein the main body is arranged in the shell and has a liquid injection hole, the mounting part protrudes from a side of the main body facing the end, and the mounting part passes through the mounting hole and is sealed and connected to the end;

[0008] The orthographic projection of the mounting hole on the main body along the axial direction of the housing covers at least a portion of the liquid injection hole.

[0009] In some embodiments, the mounting portion includes a first sub-portion and a second sub-portion, the first sub-portion is connected between the main body portion and the second sub-portion, the first sub-portion is inserted into the mounting hole, the second sub-portion extends out of the outer shell and overlaps the surface of the end portion facing away from the main body portion, and the second sub-portion is sealedly connected to the surface of the end portion facing away from the main body portion.

[0010] In some embodiments, the second sub-portion is welded to the end portion; the thickness of the second sub-portion is A, the thickness of the end portion is B, and A<B.

[0011] In some embodiments, the mounting portion includes a first sub-portion and a second sub-portion, the first sub-portion is connected between the main body portion and the second sub-portion, and the second sub-portion is inserted into the mounting hole and sealedly connected to the hole wall of the mounting hole.

[0012] In some embodiments, the end portion has a first surface facing away from the main body portion, the opening of the mounting hole away from the main body portion is located on the first surface, and the surface of the second sub-portion away from the first sub-portion is the second surface;

[0013] The distance difference between the second surface and the first surface is H, -3mm≤H≤3mm. When the second surface extends out of the mounting hole, the distance between the second surface and the first surface is a positive value. When the second surface is located in the mounting hole, the distance between the second surface and the first surface is a negative value.

[0014] In some embodiments, the outer diameter of the first sub-portion is R1, the diameter of the mounting hole is R2, and 2mm≤R2-R1≤10mm.

[0015] In some embodiments, there are multiple injection holes, which are spaced apart around the circumference of the first sub-portion.

[0016] In some embodiments, the battery cell further includes an electrode assembly, which is located in the housing and disposed on a side of the main body facing away from the end portion;

[0017] The main body has a third surface, and the electrode assembly has a fourth surface. The third surface and the fourth surface are arranged opposite to each other and spaced apart in the axial direction of the shell. The spacing between the third surface and the fourth surface is T, 1mm≤T≤3mm, or the thickness of the main body is C, T=C.

[0018] In some embodiments, the diameter of the injection hole is D, 2mm≤D≤10mm; and / or

[0019] The battery cell also includes an electrode assembly, which is located in the shell and arranged on the side of the main body facing away from the end. The electrode assembly has a fourth surface arranged toward the main body, and the fourth surface has an inner edge area and a lug area arranged around the outer periphery of the inner edge area. The orthographic projection of the injection hole in the axial direction of the shell falls within the inner edge area.

[0020] In some embodiments, the battery cell further includes an electrode assembly, which is located in the housing and disposed on a side of the main body facing away from the end portion;

[0021] The mounting portion is a hollow structure having an open cavity, and the opening of the open cavity is arranged toward the electrode assembly.

[0022] On the other hand, the present application provides a battery, which includes a battery cell as described in any one of the above embodiments.

[0023] In addition, the present application also provides an electrical device, which includes the battery as described in the above embodiment, or includes the battery cell as described in any one of the above embodiments.

[0024] Compared with the prior art, this application has the following beneficial effects:

[0025] In the above-mentioned battery cell, battery and electrical device, the current collecting plate is arranged in the housing, and the current collecting plate includes a main body and a mounting portion, the mounting portion protrudes from the side of the main body facing the end, and the mounting portion is passed through the mounting hole and is sealed and connected with the end. In this way, the setting of sealing elements can be reduced, the battery cell structure can be simplified, the assembly error of the battery cell can be increased, and the risk of missing installation can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a battery cell in an embodiment of the present application;

[0027] Figure 2 for Figure 1 The schematic diagram of the structure of the battery cell shown in FIG. 1 with the end removed;

[0028] Figure 3 for Figure 2 The schematic diagram of the structure of the battery cell shown is after the current collecting plate is removed;

[0029] Figure 4 for Figure 2 A schematic diagram of the structure of a current collecting plate in a battery cell shown;

[0030] Figure 5 for Figure 1 The cross-sectional view of the battery cell shown along the MM direction;

[0031] Figure 6 for Figure 5 An enlarged schematic diagram of a local structure E in a battery cell is shown;

[0032] Figure 7 This is a schematic diagram of the structure of a battery cell in another embodiment of the present application;

[0033] Figure 8 for Figure 7 The schematic diagram of the structure of the battery cell shown in FIG. 1 with the end removed;

[0034] Fig. 9 for Figure 8The schematic diagram of the structure of the battery cell shown is after the current collecting plate is removed;

[0035] Fig.10 for Figure 7 A schematic diagram of the structure of a current collecting plate in a battery cell shown;

[0036] Fig.11 for Figure 7 A cross-sectional view of the battery cell shown along the NN direction;

[0037] Fig.12 for Fig.11 An enlarged schematic diagram of a local structure F in a battery cell is shown;

[0038] Fig.13 for Fig.12 A schematic structural diagram of the battery cell shown is shown in which the second surface is located in the mounting hole and cooperates with the first surface.

[0039] Figure Number:

[0040] 100. Battery cell;

[0041] 10. housing; 20. current collecting plate; 30. electrode assembly;

[0042] 11. housing; 12. end; 121. mounting hole; 122. first surface; 123. boss;

[0043] 21. Main body; 211. Liquid injection hole; 212. Third surface; 22. Mounting portion; 221. First sub-portion; 222. Second sub-portion; 222a. Second surface; 31. Fourth surface; 32. Center hole. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0050] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0051] The battery includes a battery cell. For example, a cylindrical battery cell is usually provided with a liquid injection hole at the end of the shell or on the current collecting plate. After the liquid injection is completed, a sealing element is required to seal the liquid injection hole to prevent leakage during the assembly of the cylindrical battery cell. The form of independently providing a sealing element is not only complex in structure and increases the assembly error of the cylindrical battery cell, but also there is a risk of leakage due to missing sealing elements during the assembly process.

[0052] See also Figures 1 to 9 In order to alleviate the above problems, the present application provides a battery cell 100, which includes a shell 10, an electrode assembly 30 and a current collecting plate 20. The shell 10 has an end 12 arranged along its axial direction, and a mounting hole 121 is opened on the end 12. The current collecting plate 20 includes a main body 21 and a mounting portion 22, the main body 21 is arranged in the shell 10, and a liquid injection hole 211 is opened on the main body 21, the mounting portion 22 protrudes from the side of the main body 21 facing the end 12, and the mounting portion 22 is penetrated by the mounting hole 121 and is sealed and connected with the end 12; wherein, the orthographic projection of the mounting hole 121 on the main body 21 along the axial direction of the shell 10 covers at least part of the liquid injection hole 211. The electrode assembly 30 is located in the shell 11 and is arranged on the side of the main body 21 facing away from the end 12.

[0053] The battery cell 100 described in the present application is a cylindrical battery cell 100 .

[0054] The housing 10 includes a shell 11 and an end 12. The shell 11 is a structure with one end open and the other end closed or with both ends open. The end 12 covers the opening of the shell 11 and defines the internal environment of the battery cell 100 together with the shell 11 to isolate it from the external environment. Specifically, the shell 11 and the end 12 can be integrally formed, or the shell 11 and the end 12 can be connected to form a whole by welding, gluing or other methods, which can be set according to needs.

[0055] The electrode assembly 30 is a main functional element for performing electrochemical reactions in the battery cell 100 . The electrode assembly 30 has a tab, which is electrically connected to the current collecting plate 20 so as to input or output electrical energy through the current collecting plate 20 .

[0056] The collecting plate 20 includes a main body 21 and a mounting portion 22. The main body 21 is located in the outer shell 10 and is electrically connected to the pole lug of the electrode assembly 30. A liquid injection hole 211 is provided on the main body 21. The mounting hole 121 on the end 12 covers at least part of the liquid injection hole 211 along the axial direction of the outer shell 10. During liquid injection, the electrolyte flows through the mounting hole 121 and the liquid injection hole 211 in sequence into the interior of the shell 11 and contacts the electrode assembly 30. The mounting portion 22 protrudes from the side of the main body 21 facing the end 12, and the mounting portion 22 is penetrated through the mounting hole 121 and is sealed and connected to the end 12. By sealing the mounting portion 22 with the end 12, the setting of the sealing element can be reduced, so as to simplify the structure of the battery cell 100, increase the assembly error of the battery cell 100, and reduce the risk of missing installation.

[0057] Specifically, the mounting portion 22 is sealed and connected to the end portion 12 by welding. The welding method can be penetration welding or seam welding, which can be selected according to actual conditions.

[0058] The mounting portion 22 is formed by a convex portion protruding from the main body 21 toward the end 12. The end faces of both the mounting portion 22 and the convex portion away from the main body 21 should be closed to prevent the electrolyte from leaking to the outside.

[0059] Specifically, the mounting portion 22 is a hollow structure with an opening, and the opening of the opening is arranged toward the electrode assembly 30. Before the mounting portion 22 is formed, the convex portion is also a hollow structure, and the opening of the convex portion is toward the electrode assembly 30. By tapping the end of the convex portion away from the main body 21, the mounting portion 22 with a hollow structure can be formed.

[0060] In actual operation, after the electrode lug of the electrode assembly 30 is welded to the main body 21 of the current collecting plate 20, the electrode assembly 30 and the current collecting plate 20 are installed in the shell 11, and then the end portion 12 covers one end of the shell 11, and the convex portion of the current collecting plate 20 passes through the mounting hole 121 of the end portion 12, and then the end portion 12 is welded to the shell 11. After that, liquid is injected into the shell 11 through the mounting hole 121. After the injection is completed, the end of the convex portion away from the main body 21 is pressed to deform the convex portion to form the mounting portion 22 and riveted to the end portion 12, and then the mounting portion 22 and the end portion 12 are welded and fixed, thereby completing the sealing of the injection hole 211.

[0061] For example, the convex portion may be a single-layer hollow structure, or may be a double-layer or multi-layer spatial structure, and may be specifically configured as required.

[0062] The mounting portion 22 of the hollow structure is formed by pressing the convex portion of the hollow structure. The pressure applied during the pressing process is relatively small, and the convex portion is facilitated to bear the force to form the mounting portion 22.

[0063] It is worth mentioning that, in the process of tapping the convex part, the tapping pressure should be controlled to ensure the flatness of the end surface of the mounting part 22 away from the main body part 21 formed after tapping the convex part.

[0064] Please continue reading Figure 1 and Figure 6 In some embodiments, the mounting portion 22 includes a first sub-portion 221 and a second sub-portion 222. The first sub-portion 221 is connected between the main body 21 and the second sub-portion 222. The first sub-portion 221 is inserted into the mounting hole 121. The second sub-portion 222 extends out of the outer shell 10 and overlaps the surface of the end portion 12 facing away from the main body 21. The second sub-portion 222 is sealed and connected to the surface of the end portion 12 facing away from the main body 21.

[0065] In this embodiment, the welding position of the current collecting plate 20 is transferred to the mounting portion 22. Compared with the ordinary current collecting plate 20, the welding window of the current collecting plate 20 is enlarged, which is convenient for welding. In actual operation, the second sub-portion 222 overlaps the surface of the end portion 12 facing away from the main body 21, and can be pressed with the end portion 12, so that the relative position between the mounting portion 22 and the end portion 12 is fixed, which is convenient for subsequent welding and sealing of the second sub-portion 222 and the end portion 12. After welding is completed, the second sub-portion 222 and the main body 21 clamp the end portion 12, so that the current collecting plate 20 and the end portion 12 are attached together, and the heat dissipation effect is improved.

[0066] It is worth mentioning that, in this embodiment, the second sub-portion 222 and the end portion 12 are sealed and connected by penetration welding.

[0067] Further, in some embodiments, the second sub-portion 222 is welded to the end portion 12; the thickness of the second sub-portion 222 is A, the thickness of the end portion 12 is B, and A<B. The thickness of the second sub-portion 222 and the end portion 12 is the size of the second sub-portion 222 and the end portion 12 in the axial direction of the housing 10. The thickness of the second sub-portion 222 is set to be smaller than the thickness of the end portion 12. When penetration welding is used, the laser can first penetrate the second sub-portion 222 with a smaller thickness from the outside to the inside, and then shoot to the end portion 12 with a larger thickness. This welding method has low energy demand, low power, and relatively small welding stress, so the risk of welding cracking is small and the technical difficulty is low.

[0068] See also Figures 10 to 12 In some embodiments, the mounting portion 22 includes a first sub-portion 221 and a second sub-portion 222, the first sub-portion 221 is connected between the main body 21 and the second sub-portion 222, and the second sub-portion 222 is passed through the mounting hole 121 and sealed with the hole wall of the mounting hole 121. Taking the sealed connection as welding as an example, when the second sub-portion 222 is passed through the mounting hole 121, the laser does not need to penetrate the mounting portion 22 and the end portion 12 during welding, and can be directly shot between the second sub-portion 222 and the hole wall of the mounting hole 121 for welding. In this welding condition, the energy and stress required for welding are relatively small, the risk of welding cracking is small, and the technical difficulty is low. Moreover, during the welding process, the welding condition is visible, and the welding condition of the collecting plate 20 can be observed in time, so that the welding energy and welding direction can be adjusted according to the welding condition, and the welding effect is good.

[0069] It is worth mentioning that, in this embodiment, welding is performed by seam welding.

[0070] See also Fig.12 and Fig.13 In one embodiment, the end portion 12 has a first surface 122 facing away from the main body portion 21, the opening of the mounting hole 121 away from the main body portion 21 is located on the first surface 122, and the surface of the second sub-portion 222 away from the first sub-portion 221 is the second surface 222a; the spacing difference between the second surface 222a and the first surface 122 is H, -3mm≤H≤3mm, when the second surface 222a extends out of the mounting hole 121, the spacing between the second surface 222a and the first surface 122 is a positive value, when the second surface 222a is located in the mounting hole 121, the spacing between the second surface 222a and the first surface 122 is a negative value, and when the second surface 222a is flush with the first surface 122, the spacing between the second surface 222a and the first surface 122 is 0mm.

[0071] For example, specifically, H is -3 mm, -2 mm, 0 mm, 1 mm or 3 mm, but is not limited to the listed ratios, and other unlisted ratios within the ratio range are also applicable.

[0072] In this embodiment, the spacing difference between the second surface 222a and the first surface 122 is H, -3mm≤H≤3mm, so after the convex portion is pressed to form the mounting portion 22, the second surface 222a of the second sub-portion 222 is substantially flush with the first surface 122 of the end portion 12, and the joint of the mounting portion 22 and the hole wall of the mounting hole 121 can be seam welded. The advantage is that more materials can be saved, the surface of the housing 10 is flat, and the risk of being scratched by foreign objects is reduced.

[0073] See also Figure 6 and Fig.12 In some embodiments, the outer diameter of the first sub-portion 221 is R1, the aperture of the mounting hole 121 is R2, and 2mm≤R2-R1≤10mm. The outer diameter of the first sub-portion 221 is the outer diameter of the convex portion before being pressed. After the convex portion is pressed, the end of the convex portion connected to the main portion 21 forms the first sub-portion 221, and the other end of the convex portion away from the main portion 21 forms the second sub-portion 222.

[0074] For example, specifically, R2-R1 is 2 mm, 3 mm, 4.5 mm, 5 mm, 7 mm or 10 mm, but is not limited to the listed ratios, and other unlisted ratios within the ratio range are also applicable.

[0075] If the difference between R2 and R1 is too small, it is understandable that before the convex portion is pressed, the reduction between the convex portion and the hole wall of the mounting hole 121 is also small, so the operation space for liquid injection is small, the liquid injection is inconvenient, and the liquid injection efficiency is low. In the case where the hole diameter of the mounting hole 121 remains unchanged, if the difference between R2 and R1 is too large, the outer diameter of the convex portion is very small, the strength is insufficient, and it is easy to be twisted and deformed during the pressing process, affecting the pressing effect.

[0076] By designing 2mm≤R2—R1≤10mm, the strength of the convex part and the pressing effect can be guaranteed while facilitating the injection and improving the injection efficiency.

[0077] See also Figure 4 and Figure 8 In some embodiments, there are multiple injection holes 211, which are arranged at intervals around the circumference of the first sub-section 221. Each injection hole 211 is arranged close to the first sub-section 221 of the mounting portion 22, so that the orthographic projection of the mounting hole 121 on the main body 21 along the axial direction of the housing 10 can cover each injection hole 211 as much as possible. The arrangement of multiple injection holes 211 can facilitate injection from the circumference of the first sub-section 221, and the injection speed is fast, thereby improving the injection efficiency and injection speed.

[0078] It is understood that the liquid flow rate refers to the speed at which the electrolyte enters the housing 11 through the injection hole 211. A fast liquid flow rate can prevent the electrolyte from accumulating at the installation port and causing the electrolyte to flow back to the outside of the housing 10, and allow the electrode assembly 30 to be fully infiltrated with the electrolyte.

[0079] See also Figure 6 In some embodiments, the main body 21 has a third surface 212, and the electrode assembly 30 has a fourth surface 31. The third surface 212 and the fourth surface 31 are opposite to and spaced apart in the axial direction of the shell 10. The distance between the third surface 212 and the fourth surface 31 is T, 1mm≤T≤3mm, or the thickness of the main body 21 is C, T=C.

[0080] For example, specifically, T is 1 mm, 2 mm or 3 mm, but is not limited to the listed ratios, and other unlisted ratios within the ratio range are also applicable.

[0081] If the distance between the third surface 212 and the fourth surface 31 is too small, it is not conducive for the electrolyte to flow in the shell 11 and infiltrate the electrode assembly 30. If the distance between the third surface 212 and the fourth surface 31 is too large, the electrode tabs are easily pulled after the current collecting plate 20 is welded to the electrode tabs, and space is wasted.

[0082] By setting 1mm≤T≤3mm, or the thickness of the main body 21 is C, T=C, the distance between the main body 21 and the electrode assembly 30 is appropriate, the tab is not easily pulled, and the electrolyte can fully flow and infiltrate the electrode assembly 30.

[0083] See also Fig.10 In some embodiments, the diameter of the injection hole 211 is D, 2mm≤D≤10mm. For example, specifically, D is 2mm, 4.5mm, 5mm, 7mm or 10mm, but is not limited to the listed proportions, and other unlisted proportions within the proportion range are also applicable. The diameter of the injection hole 211 is in the range of 2mm≤D≤10mm, so that the cross-sectional area of ​​the injection hole 211 is more appropriate, so as to facilitate the rapid passage of the electrolyte and achieve faster injection. Moreover, the injection hole 211 with a diameter within this range has little effect on the strength of the main body 21, so that the main body 21 can maintain better mechanical strength.

[0084] See also Figures 4 to 6 In some embodiments, the fourth surface 31 is disposed toward the main body 21, and the fourth surface 31 has an inner edge region and a tab region disposed around the inner edge region, and the positive projection of the injection hole 211 in the axial direction of the housing 10 falls within the inner edge region. The inner edge region refers to the region surrounding the central hole 32 forming the electrode assembly 30, and the tab region refers to the region covered by the tab after being flattened.

[0085] The orthographic projection of the injection hole 211 in the axial direction of the outer shell 10 falls into the inner edge area, and the inner edge area is not blocked by the pole ear. Therefore, during the injection process, the injected electrolyte can be poured into the inner edge area as much as possible under the action of gravity and flow into the center hole 32 of the electrode assembly 30, so that the electrolyte can fully infiltrate the electrode assembly 30 from the inside to the outside in the electrode assembly 30, and the infiltration effect is good.

[0086] See also Figure 6 and Fig.12 In some embodiments, the surface of the end portion 12 facing the electrode assembly 30 is recessed in a direction away from the electrode assembly 30 to form a boss 123 protruding from the first surface 122 of the end portion 12 facing away from the electrode assembly 30, and the boss 123 is arranged around the mounting hole 121 and the circumference of the mounting portion 22, and the boss 123 is away from the distance between the end surface of the electrode assembly 30 and the fourth surface 31 of the electrode assembly 30 (such as Figure 6 ), which is greater than the distance between the second surface 222a of the mounting portion 22 and the fourth surface 31 of the electrode assembly 30 (as shown in FIG. Figure 6 That is, the boss 123 protrudes further from the first surface 122 than the mounting portion 22. This configuration, on the one hand, increases the strength of the end portion 12 to prevent the end portion 12 from being pulled and deformed during the pressing process, and on the other hand, reduces the mounting portion 22 from being scratched by foreign objects, thereby reducing the risk of sealing failure.

[0087] The present application also provides a battery, which includes the battery cell 100 as described in any one of the embodiments.

[0088] The present application also provides an electric device, which includes a battery as described in any of the above embodiments, or includes a battery cell 100 as described in any of the above embodiments. The battery or battery cell 100 is used to power the electric device. The electric device in the present application has the effects described in any of the above embodiments, so it will not be repeated here.

[0089] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0090] It should be understood that the technical solutions described in the embodiments of the present application are not limited to being applicable to the electrical devices described above.

[0091] The above-mentioned battery cell 100, battery and electrical device, the current collecting plate 20 is arranged in the housing 10, and the current collecting plate 20 includes a main body 21 and a mounting portion 22, the mounting portion 22 protrudes from the side of the main body 21 facing the end 12, and the mounting portion 22 is penetrated through the mounting hole 121 and is sealed and connected with the end 12. In this way, the setting of the sealing element can be reduced, the structure of the battery cell 100 can be simplified, the assembly error of the battery cell 100 can be increased, and the risk of missing installation can be reduced.

[0092] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: The housing (10) has an end portion (12) arranged along its axial direction, and a mounting hole (121) is provided on the end portion (12); and The collecting plate (20) comprises a main body (21) and a mounting portion (22), wherein the main body (21) is arranged in the housing (10), and a liquid injection hole (211) is provided on the main body (21), and the mounting portion (22) protrudes from a side of the main body (21) facing the end portion (12), and the mounting portion (22) is passed through the mounting hole (121) and is sealed and connected to the end portion (12); The orthographic projection of the mounting hole (121) on the main body (21) along the axial direction of the housing (10) covers at least a portion of the liquid injection hole (211).

2. The battery cell according to claim 1, characterized in that: The mounting portion (22) comprises a first sub-portion (221) and a second sub-portion (222); the first sub-portion (221) is connected between the main body portion (21) and the second sub-portion (222); the first sub-portion (221) is inserted into the mounting hole (121); the second sub-portion (222) extends out of the housing (10) and overlaps the surface of the end portion (12) facing away from the main body portion (21); and the second sub-portion (222) is sealedly connected to the surface of the end portion (12) facing away from the main body portion (21).

3. The battery cell according to claim 2, characterized in that: The second sub-portion (222) is welded to the end portion (12); the thickness of the second sub-portion (222) is A, the thickness of the end portion (12) is B, and A<B.

4. The battery cell according to claim 1, characterized in that: The mounting portion (22) comprises a first sub-portion (221) and a second sub-portion (222); the first sub-portion (221) is connected between the main body portion (21) and the second sub-portion (222); the second sub-portion (222) is inserted into the mounting hole (121) and is sealedly connected to the hole wall of the mounting hole (121).

5. The battery cell according to claim 4, characterized in that: The end portion (12) has a first surface (122) facing away from the main body portion (21); an opening of the mounting hole (121) away from the main body portion (21) is located on the first surface (122); and a surface of the second sub-portion (222) away from the first sub-portion (221) is a second surface (222a); The distance difference between the second surface (222a) and the first surface (122) is H, -3mm≤H≤3mm; when the second surface (222a) extends out of the mounting hole (121), the distance between the second surface (222a) and the first surface (122) is a positive value; when the second surface (222a) is located in the mounting hole (121), the distance between the second surface (222a) and the first surface (122) is a negative value.

6. The battery cell according to any one of claims 2 to 5, characterized in that: The outer diameter of the first sub-section (221) is R1, the diameter of the mounting hole (121) is R2, and 2mm≤R2-R1≤10mm.

7. The battery cell according to any one of claims 2 to 5, characterized in that: There are a plurality of injection holes (211), which are arranged at intervals in the circumferential direction around the first sub-portion (221).

8. The battery cell according to claim 1, characterized in that: The battery cell further comprises an electrode assembly (30), wherein the electrode assembly (30) is located in the housing (10) and is arranged on a side of the main body (21) facing away from the end (12); The main body (21) has a third surface (212), and the electrode assembly (30) has a fourth surface (31). The third surface (212) and the fourth surface (31) are arranged opposite to each other and spaced apart in the axial direction of the shell (10). The spacing between the third surface (212) and the fourth surface (31) is T, 1mm≤T≤3mm, or the thickness of the main body (21) is C, T=C.

9. The battery cell according to claim 1, characterized in that: The diameter of the injection hole (211) is D, 2mm≤D≤10mm; and / or The battery cell further comprises an electrode assembly (30), wherein the electrode assembly (30) is located in the outer shell (10) and is arranged on a side of the main body (21) facing away from the end (12), the electrode assembly (30) has a fourth surface (31) arranged toward the main body (21), the fourth surface (31) has an inner edge region and a tab region arranged around the outer periphery of the inner edge region, and the orthographic projection of the injection hole (211) in the axial direction of the outer shell (10) falls within the inner edge region.

10. The battery cell according to claim 1, characterized in that: The battery cell further comprises an electrode assembly (30), wherein the electrode assembly (30) is located in the housing (10) and is arranged on a side of the main body (21) facing away from the end (12); The mounting portion (22) is a hollow structure having an open cavity, and the opening of the open cavity is arranged toward the electrode assembly (30).

11. A battery, characterized in that: The battery cell comprises a battery cell as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: The invention comprises the battery as claimed in claim 11 above, or comprises the battery cell as claimed in any one of claims 1 to 10.

Images