A single battery, a battery pack and an electronic device

Abstract

The utility model provides a kind of single battery, battery pack and electronic device, the single battery includes shell, electrode assembly and pole, shell includes end wall, end wall includes mounting hole;Electrode assembly is housed in shell;Pole is insulatedly installed in end wall and is electrically connected with electrode assembly, pole includes column body part, first limiting part and second limiting part;Column body part penetrates mounting hole, second limiting part and first limiting part are connected respectively in both ends of column body part, second limiting part is located at the outside of shell, and first limiting part is located at the inside of shell;End wall is clamped between second limiting part and first limiting part, along the thickness direction of end wall, the thickness of first limiting part is H, the outer contour radius of first limiting part is R1, and 12mm≤R1≤17mm, 12≤R1 / H≤16.875.The utility model can improve the technical problem that due to insufficient axial stiffness of pole, the overall pressure resistance of single battery is limited to improve.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a single cell battery, a battery pack, and an electronic device. Background Technology

[0002] The terminal is a key component in a single battery cell that connects the external circuitry to the internal electrode assembly. Its performance directly affects the lifespan and safety performance of the single battery cell.

[0003] However, current common electrode structures generally suffer from insufficient axial stiffness. When the internal pressure of a single battery cell increases, the electrode's axial load-bearing capacity is weak, making it prone to axial deformation. This deformation can lead not only to sealing failure of the electrode but also to failure of the connection between the electrode and the battery casing, causing the electrode to fly off the casing. Therefore, there is an urgent need to develop electrode structures with higher axial stiffness to improve the voltage withstand performance of existing single batteries. Utility Model Content

[0004] In view of the problems existing in the prior art, the present invention provides a single cell battery, a battery pack and an electronic device to improve the technical problem that the overall voltage resistance performance of a single cell battery is limited by insufficient axial stiffness of the terminal post.

[0005] To achieve the above and other related objectives, the first aspect of this utility model provides a single-cell battery, which includes a housing, an electrode assembly, and a terminal post. The housing includes an end wall with a mounting hole. The electrode assembly is housed within the housing. The terminal post is insulated and mounted on the end wall and electrically connected to the electrode assembly. The terminal post includes a column portion, a first limiting portion, and a second limiting portion. The column portion passes through the mounting hole. The second limiting portion and the first limiting portion are respectively connected to both ends of the column portion. The second limiting portion is located outside the housing, and the first limiting portion is located inside the housing. Both the second limiting portion and the first limiting portion extend from the column portion to the outer periphery of the end wall. The end wall is sandwiched between the second limiting portion and the first limiting portion. Along the thickness direction of the end wall, the thickness of the first limiting portion is H, and the outer radius of the first limiting portion is R1, where 12mm≤R1≤17mm and 12≤R1 / H≤16.875.

[0006] In one embodiment of the single-cell battery of this utility model, the radius of the cylindrical part is R2, and R1-R2≤0.6×R2.

[0007] In one embodiment of the single cell of this utility model, the electrode post is a rotating structure and the second limiting part is a riveted flange; along the thickness direction of the end wall, the outer contour projection of the second limiting part is located inside the outer contour projection of the first limiting part.

[0008] In one embodiment of the single cell of this utility model, the radius of the cylindrical part is R2, the outer contour radius of the second limiting part is R3, and 0.7mm≤(R3-R2)≤1.25mm.

[0009] In one embodiment of the single cell of this utility model, the single cell further includes a first insulating member, which is disposed on the side of the end wall facing the electrode assembly and extends at least partially between the first limiting portion and the end wall, and forms an annular contact surface with the first limiting portion; the minimum width of the annular contact surface along the radial direction of the first limiting portion is K, and K≥2.5mm.

[0010] In one embodiment of the single cell of this utility model, the single cell further includes a sealing ring, which is sandwiched between the end wall and the first limiting portion. The outer ring of the sealing ring extends toward the inner edge of the first insulating member and has a gap with the inner edge of the first insulating member.

[0011] In one embodiment of the single-cell battery of this utility model, the casing is a cylindrical structure and the outer diameter of the casing is 46mm.

[0012] In one embodiment of the single cell of this utility model, the radius of the column portion is R2, and an annular recess is provided on the side of the electrode column facing the electrode assembly. The maximum radius of the annular recess is R4, and R2-R4≥1.65×H.

[0013] A second aspect of this invention provides a battery pack comprising the individual cells described in any of the above embodiments.

[0014] A third aspect of this invention provides an electronic device that includes the battery pack described in the above embodiments.

[0015] During the use of a single battery cell, when the internal gas pressure is too high, the electrode post will move outwards towards the end wall under the influence of the internal gas pressure. If the strength and rigidity of the first limiting part are insufficient, the first limiting part will bend from its root, resulting in weakened connection strength and sealing performance between the electrode post and the casing. Furthermore, if the electrode post continues to move outwards towards the end wall under the influence of internal gas pressure, when the outer diameter of the bent first limiting part is smaller than the mounting hole of the electrode post, the electrode post can detach from the casing and fly out. Therefore, under the same internal pressure, the strength and rigidity of the first limiting part directly affect the axial displacement of the electrode post relative to the end wall, that is, directly affect the axial rigidity of the electrode post. The single battery cell of this invention sets the outer radius R1 of the first limiting part located inside the casing to 12mm≤R1≤17mm, and makes the ratio of R1 to H satisfy 12≤R1 / H≤16.875. This design ensures that the first limiting part has sufficient strength and rigidity to meet the axial connection strength requirements between the electrode post and the end wall, while avoiding the risk of thermal runaway caused by excessively large R1 squeezing the electrode assembly. By reasonably setting the value of R1 and the ratio of R1 to H, the electrode post can have greater axial rigidity. Therefore, it can effectively reduce the limitation on the overall voltage withstand performance of the single cell caused by insufficient axial rigidity of the electrode post, thereby helping to improve the voltage withstand performance of the single cell.

[0016] Meanwhile, by limiting the ratio of R1 to H to 12≤R1 / H≤16.875, the thickness H of the first limiting part can also be limited. This ensures that the thickness of the first limiting part can meet the basic connection strength requirements between the electrode post and the end wall, while also preventing the excessive thickness of the first limiting part from encroaching on a large portion of the internal height space of the casing, thus ensuring the volumetric energy density of the single battery cell. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the overall structure of an example of a single battery cell of this utility model;

[0019] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0020] Figure 3 This is a schematic diagram of the electrode assembly structure of an example of a single cell of this utility model;

[0021] Figure 4 This is a partial schematic diagram of the connection position between the electrode post and the end wall in an example of a single cell of this utility model;

[0022] Figure 5 This is a partial schematic diagram of the installation structure between the sealing ring and the first insulating component in an example of a single-cell battery of this utility model;

[0023] Figure 6 This is a schematic diagram of the overall structure of the electrode post in an example of a single-cell battery of this utility model;

[0024] Figure 7 This is an axial cross-sectional view of the electrode post in an example of a single cell of this utility model;

[0025] Figure 8 This is a schematic diagram of an example of the battery pack of this utility model;

[0026] Figure 9 This is a schematic diagram of an example of the electronic device of this utility model.

[0027] Component designation explanation:

[0028] 100. Single cell; 110. Casing; 111. End wall; 1111. Mounting hole; 112. Side wall; 113. Opening; 114. End cap; 120. Electrode assembly; 121. Positive electrode; 1211. Positive current collector; 1212. First coated area; 1213. First uncoated area; 122. Separator; 123. Negative electrode; 1231. Negative current collector; 1232. Second coated area; 1233. Second uncoated area; 124. 125. Negative electrode tab; 136. Positive electrode tab; 137. Terminal post; 138. Post body; 139. Second limiting part; 130. First limiting part; 131. Annular recess; 142. First insulating component; 143. Annular contact surface; 150. Sealing ring; 160. Second insulating component; 170. Current collector; 200. Battery pack; 211. Housing; 212. First housing body; 213. Second housing body; 300. Electronic device; 310. Working part. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0030] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0031] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0032] Please see Figures 1 to 9 This utility model provides a single battery 100, a battery pack 200, and an electronic device 300. By optimizing the thickness and outer radius of the first limiting part 133 of the terminal 130 located inside the housing 110, the single battery 100 can not only improve the axial stiffness of the terminal 130 and enhance the overall pressure resistance of the single battery 100, but also reduce the probability of internal short circuits leading to thermal failure during the use of the single battery 100, thereby improving the safety of the single battery 100.

[0033] Please see Figure 1 and Figure 2 In one embodiment of the single cell 100 of this utility model, the single cell 100 includes a housing 110, an electrode assembly 120, and a terminal post 130.

[0034] Please see Figure 1 and Figure 2The housing 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. As long as a stable sealing and electrical connection can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in various ways, such as integral stamping, integral casting, or separate welding. The circumference of the side wall 112 is not limited; it can be cylindrical or prismatic, or it can follow any other closed-loop contour that matches the end wall 111.

[0035] In this embodiment, the outer edge of the end wall 111 is circular, and the side wall 112 is cylindrical and surrounds the outer edge of the end wall 111. A circular opening 113 is formed at the end of the side wall 112 opposite to the end wall 111. A receiving cavity is formed in the housing 110 formed by the end wall 111 and the side wall 112 for accommodating the electrode assembly 120, electrolyte, and other necessary battery components.

[0036] Please see Figures 1 to 3 The electrode assembly 120 is disposed inside the housing 110 and is a component in the single cell 100 where electrochemical reactions occur. The housing 110 may contain one or more electrode assemblies 120. Exemplarily, in this embodiment, one electrode assembly 120 is disposed within the housing 110. The electrode assembly 120 includes an electrode sheet and a separator 122, which are wound to form a wound structure. Specifically, in this embodiment, the electrode assembly 120 includes a positive electrode sheet 121, a separator 122, and a negative electrode sheet 123 wound axially around the housing 110.

[0037] Please see Figure 3 The positive electrode 121 includes a positive current collector 1211 and a positive active material layer coated on the positive current collector 1211. A first coated area 1212 coated with the positive active material layer and a first uncoated area 1213 uncoated with the positive active material layer are formed on the positive current collector 1211. The first coated area 1212 and the first uncoated area 1213 are arranged along the axial direction of the housing 110. The first uncoated area 1213 extends to one end of the single cell 100 in the height direction to the outside of the separator 122 and is bent towards the axis of the housing 110 to form a stacked positive electrode tab 125.

[0038] The negative electrode 123 includes a negative current collector 1231 and a negative active material layer coated on the negative current collector 1231. A second coated area 1232 coated with the negative active material layer and a second uncoated area 1233 uncoated with the negative active material layer are formed on the negative current collector 1231. The second coated area 1232 and the second uncoated area 1233 are arranged along the axial direction of the housing 110. The second uncoated area 1233 extends to the other end of the single cell 100 in the height direction to the outside of the separator 122 and is bent towards the axis of the housing 110 to form a stacked negative electrode tab 124.

[0039] A separator 122 is disposed between the positive electrode 121 and the negative electrode 123 to isolate the positive and negative active material layers. Taking a lithium-ion single-cell battery 100 as an example, the positive current collector 1211 can be made of aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative current collector 1231 can be made of copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The substrate material of the separator 122 can be polypropylene (PP) or polyethylene (PE), etc. To protect and insulate the electrode assembly 120, an insulating film can also be wrapped around the electrode assembly 120. The insulating film can be synthesized from PP, PE, polyethylene terephthalate (PET), polyvinyl chloride (PVC), or other polymer materials.

[0040] Furthermore, in this invention, the positive electrode tab 125 faces the end wall 111 or the opening 113, while the negative electrode tab 124 faces the other end of the housing 110. Please refer to [link / reference]. Figure 1 In this embodiment, the positive electrode tab 125 faces the end wall 111 and is electrically connected to the terminal post 130, making the terminal post 130 positively charged. The negative electrode tab 124 faces the opening 113, and the housing 110 is electrically connected to the negative electrode tab 124, thus making it negatively charged. However, in another embodiment, the negative electrode tab 124 can be connected to the terminal post 130, and the positive electrode tab 125 can be connected to the housing 110.

[0041] Please see Figure 1 The single cell 100 may further include an end cap 114, which is sealed and installed in the opening 113. The outer edge shape of the end cap 114 corresponds to the shape of the opening 113 and is connected to the side wall 112 to seal the opening 113. The installation method of the end cap 114 includes, but is not limited to, mechanical sealing or welding sealing. In this embodiment, the end cap 114 is sealed and plugged in the opening 113 by means of mechanical sealing.

[0042] Please see Figure 1 and Figure 2 The electrode post 130 is fixed to the end wall 111 and electrically connected to the electrode assembly 120. It should be noted that the end of the electrode post 130 facing the electrode assembly 120 can be directly electrically connected to the positive electrode tab 125 through the end wall 111, or it can be indirectly electrically connected to the positive electrode tab 125 through a current collector. Optionally, in this embodiment, a current collector 170 is provided on the side of the electrode assembly 120 facing the end wall 111, and the electrode post 130 is electrically connected to the positive electrode tab 125 through the current collector 170.

[0043] Please see Figure 2 The electrode post 130 includes a column portion 131, a first limiting portion 133, and a second limiting portion 132. The first limiting portion 133 and the second limiting portion 132 are respectively disposed at both ends of the column portion 131 in the height direction, and both extend from the outer periphery of the column portion 131 to the outer periphery of the end wall 111 in the radial direction. The end wall 111 is provided with a mounting hole 1111, through which the column portion 131 passes. The end of the column portion 131 facing the electrode assembly 120 is connected to the first limiting portion 133, that is, the first limiting portion 133 is located inside the housing 110. The end of the column portion 131 away from the electrode assembly 120 is connected to the second limiting portion 132, that is, the second limiting portion 132 is located outside the housing 110. The cross-section of the first limiting portion 133 and the second limiting portion 132 can be circular, square, prismatic, or other irregular contours that can achieve stable conductivity, etc., and this embodiment does not limit this. Optionally, in order to facilitate the production and processing of the pole post 130, in this embodiment, the outer contour of the first limiting part 133 and the outer contour of the second limiting part 132 are both circular contours coaxially arranged with the pole body part 131.

[0044] Please see Figure 2 The end wall 111 is sandwiched between the first limiting portion 133 and the second limiting portion 132. To achieve an insulated connection between the electrode post 130 and the end wall 111, a first insulating member 140 is provided between the first limiting portion 133 and the end wall 111. At least a portion of the first insulating member 140 is sandwiched between the inner side of the end wall 111 (the side of the end wall 111 facing the electrode assembly 120) and the first limiting portion 133, thereby achieving insulation between the inner side of the end wall 111 and the first limiting portion 133. A second insulating member 160 is provided between the second limiting portion 132 and the end wall 111. At least a portion of the second insulating member 160 is sandwiched between the outer side of the end wall 111 (the side of the end wall 111 facing away from the electrode assembly 120) and the second limiting portion 132, thereby achieving insulation between the second limiting portion 132 and the end wall 111.

[0045] Please see Figure 4 and Figure 7 Along the thickness direction of the end wall 111, the thickness of the first limiting part 133 is H, and the outer contour radius of the first limiting part 133 is R1, where 12mm ≤ R1 ≤ 17mm. For example, R1 can be 12mm, 15mm, or 17mm, etc., and 12 ≤ R1 / H ≤ 16.875. For example, the ratio between R1 and H can be 12, 14.5, 16.875, etc. It should be noted that the first limiting part 133 can be of uniform thickness or unequal thickness. In this embodiment, the thickness H of the first limiting part 133 refers to the minimum thickness of the first limiting part 133 (ignoring the chamfer effect at the outer edge of the first limiting part 133).

[0046] During the use of the single cell 100, when the internal pressure of the gas generated inside the single cell 100 is too high, the terminal post 130 will move outward toward the end wall 111 under the action of the internal gas pressure. If the strength and rigidity of the first limiting part 133 are small, the first limiting part 133 will bend from the root, resulting in a weakening of the connection strength and sealing performance between the terminal post 130 and the housing 110. Furthermore, if the terminal post 130 continues to move outward toward the end wall 111 under the action of the internal gas pressure, when the outer diameter of the outer contour of the bent first limiting part 133 is smaller than the mounting hole 1111 of the terminal post 130, the terminal post 130 can detach from the housing 110 and fly out. Therefore, under the same internal pressure, the strength and rigidity of the first limiting part 133 will directly affect the axial displacement of the terminal post 130 relative to the end wall 111, that is, directly affect the axial rigidity of the terminal post 130.

[0047] It should be noted that when the thickness H of the first limiting part 133 reaches 0.8mm, the axial stiffness of the electrode post 130 can be effectively enhanced by optimizing the outer contour radius R1 of the first limiting part 133. Under the condition that R1 ≥ 12mm, the basic connection strength between the electrode post 130 and the end wall 111 can be guaranteed. If R2 exceeds 17mm, the first limiting part 133 is prone to deformation when the internal gas pressure inside the single cell 100 is too high, causing the radial outer edge of the first limiting part 133 to move towards the electrode assembly 120, which can easily directly or indirectly compress the electrode assembly 120, leading to thermal runaway. If the thickness H of the first limiting part 133 is too large, it will cause a loss of energy density in the single cell 100 and has limited effect on improving the axial stiffness of the electrode post 130.

[0048] In the simulation experiment, the effect of the sealing form of the opening 113 of the single cell 100 on the ultimate pressure of the terminal post 130 is ignored. For multiple sets of single cells 100 with a diameter of 46mm, the structure of their terminal posts 130 is as follows: Figure 2 As shown, the pole post 130 is riveted to the first insulating member 140 via the second limiting part 132. The riveting force causes the first limiting part 133 and the end wall 111 to clamp the sealing ring 150, compressing it. Based on this, the ultimate pressure of the pole post 130 flying out was simulated by changing the thickness and length of the first limiting part 133. The simulation results are shown in Table 1.

[0049]

[0050] Table 1

[0051] By comparing Example 8 and Example 1, it can be seen that when the thickness of the first limiting part 133 increases from 0.8 mm to 1.0 mm, the ultimate pressure resistance of the corresponding single cell 100 (that is, the ultimate pressure at which the electrode post 130 flies out) will also increase accordingly. This indicates that the thickness H of the first limiting part 133 is an important factor affecting the pressure resistance performance of the electrode post 130. Increasing the thickness helps to improve its pressure resistance, thereby improving the pressure resistance performance of the single cell 100.

[0052] Through Examples 1 to 7, it can be seen that the ultimate withstand voltage of the single cell 100 does not continuously increase with the growth of the first limiting portion 133. Analysis of experimental data from Examples 1 to 11 shows that when the outer contour radius R1 of the first limiting portion 133 is between 12mm and 17mm, and the value of R1 / H is between 12 and 16.875, the ultimate withstand voltage of the single cell 100 can meet the basic connection strength between the terminal post 130 and the end wall 111. This indicates that setting R1 to 12mm≤R1mm≤17mm and 12≤R1 / H≤16.875 is relatively reasonable.

[0053] Analysis of the experimental data in Comparative Examples 1 and 2 shows that when R1 is less than 12 mm, the ultimate pressure of the pole post 130 ejecting is relatively low, which cannot meet the basic connection strength requirements between the pole post 130 and the end wall 111. Furthermore, when R1 is between 12 mm and 17 mm, but R1 / H is greater than 16.875, the ultimate pressure of the pole post 130 ejecting is also relatively low, failing to meet the basic connection strength requirements between the pole post 130 and the end wall 111.

[0054] The experimental data in Table 1 above shows that the single-cell battery 100 of this invention sets the outer contour radius R1 of the first limiting part 133 located inside the casing 110 to 12mm≤R1≤17mm, and the ratio of R1 to H satisfies 12≤R1 / H≤16.875. This design ensures that the first limiting part 133 has sufficient strength and rigidity to meet the axial connection strength requirements between the electrode post 130 and the end wall 111, and avoids the risk of thermal runaway due to the electrode assembly 120 being squeezed by the electrode post 130 during its ejection process caused by an excessively large outer contour radius R1 of the first limiting part 133. This embodiment, by reasonably setting R1 and the R1 / H ratio, enables the electrode post 130 to have greater axial rigidity, thus effectively reducing the limitation on the overall voltage resistance performance of the single-cell battery 100 caused by insufficient axial rigidity of the electrode post 130, thereby improving the voltage resistance performance of the single-cell battery 100.

[0055] Please see Figure 4 and Figure 7In one embodiment of the single-cell battery 100 of this utility model, the radius of the cylindrical portion 131 is R2, and R1-R2≤0.6×R2. This setting limits the width of the first limiting portion 133 extending to the radially outer side of the cylindrical portion 131, thereby facilitating the improvement of raw material utilization and production efficiency of the electrode post 130 when it is formed by cold heading, thus helping to reduce the production cost of the electrode post 130.

[0056] Please see Figure 4 and Figure 7 In one embodiment of the single-cell battery 100 of this utility model, the terminal post 130 is a rotating structure, and the second limiting part 132 is a riveted flange. Along the thickness direction of the end wall 111, the outer contour projection of the second limiting part 132 is located inside the outer contour projection of the first limiting part 133, that is, the outer contour radius of the second limiting part 132 is smaller than the outer contour radius of the first limiting part 133. For ease of description, the outer contour radius of the second limiting part 132 is marked as R3, and the outer contour radius of the first limiting part 133 is R1, then R3 < R1.

[0057] By configuring the second limiting part 132 as a riveting flange, a fixed connection between the outer side of the pole post 130 and the end wall 111 can be achieved through riveting, thus forming an external riveting connection between the pole post 130 and the end wall 111. This design not only facilitates the fixed connection between the pole post 130 and the end wall 111, improving the installation efficiency of the pole post 130, but also allows for easy observation of the riveting process, facilitating better control of the riveting effect and achieving better riveting connection strength between the pole post 130 and the end wall 111. Simultaneously, by positioning the outer contour projection of the second limiting part 132 within the outer contour projection of the first limiting part 133, the outer contour dimensions of the riveting flange can be effectively limited, preventing the riveting flange from becoming too large and thus reducing the impact on the flatness of the riveting flange.

[0058] Please see Figure 4 and Figure 7In one embodiment of the single-cell battery 100 of this utility model, the radius of the cylindrical portion 131 is R2, and the outer contour radius of the second limiting portion 132 is R3, satisfying 0.7mm≤(R3-R2)≤1.25mm. For example, the difference between R3 and R2 can be 0.7mm, 1.0mm, or 1.25mm, etc. By setting 0.7mm≤(R3-R2)≤1.25mm, the radial dimension of the second limiting portion 132 extending to the outer periphery of the cylindrical portion 131 can be effectively controlled. When the outer contour radius R3 of the second limiting portion 132 is too large (i.e., the difference between R3 and R2 is too large), it will lead to an increase in the overall size and mass of the terminal post 130, thereby reducing the mass energy density of the single-cell battery 100. By limiting the difference between R3 and R2 to within 1.25mm, it can be ensured that the size and mass of the terminal post 130 are kept within a reasonable range, avoiding a significant impact on the energy density of the single-cell battery 100. If the outer radius R3 of the second limiting part 132 is too small (i.e., the difference between R3 and R2 is too small), the pressing area between the second limiting part 132 and the first insulating member 140 and the end wall 111 may be insufficient, thereby affecting the insulation performance of the pole post 130 and the stability of the pole post 130 connection. By ensuring that the difference between R3 and R2 is not less than 0.7 mm, sufficient pressing area can be provided between the second limiting part 132 and the first insulating member 140 and the end wall 111, thereby ensuring the insulation performance of the pole post 130 and the stability of the connection.

[0059] Please see Figure 4 and Figure 5 In one embodiment of the single-cell battery 100 of this utility model, a first insulating member 140 is disposed on the side of the end wall 111 facing the electrode assembly 120, and extends at least partially between the first limiting portion 133 and the end wall 111. An annular contact surface 141 is formed between the first insulating member 140 and the first limiting portion 133. Along the radial direction of the first limiting portion 133, the minimum width of the annular contact surface 141 is K, and K≥2.5mm. It should be noted that the annular contact surface 141 can be a ring structure of equal width or a ring structure of unequal width, as long as the minimum width K of the annular contact surface 141 is ensured to be ≥2.5mm.

[0060] In this embodiment, by limiting the minimum width K of the annular contact surface 141 to ≥ 2.5 mm, this setting ensures sufficient compression area between the first insulating member 140 and the first limiting part 133 on the inner side of the end wall 111, thereby guaranteeing a reliable compression contact between the electrode post 130 and the first insulating member 140. This design not only provides stable and reliable insulation performance between the electrode post 130, the electrode assembly 120, and the housing 110, but also provides stable support for the installation positioning of the electrode post 130 and the housing 110, ensuring the stability of the electrode post 130 installation. Therefore, this design can effectively ensure the safety and stability of the single cell 100 during operation.

[0061] Please see Figure 4 and Figure 5 Considering the sealing performance between the electrode post 130 and the end wall 111, optionally, in one embodiment of the single cell 100 of this utility model, the single cell 100 further includes a sealing ring 150. The sealing ring 150 is disposed on the side of the end wall 111 facing the electrode assembly 120, and is sandwiched between the end wall 111 and the first limiting portion 133 along the thickness direction of the end wall 111. The sealing ring 150 may be coaxially disposed with the first limiting portion 133 or not; this embodiment is symmetrical and not limited. The inner ring of the sealing ring 150 extends toward the outer peripheral surface of the post portion 131 and contacts the outer peripheral surface of the post portion 131. The outer ring of the sealing ring 150 extends toward the inner edge of the first insulating member 140, and there is a gap between the outer ring of the sealing ring 150 and the inner edge of the first insulating member 140, that is, the outer ring of the sealing ring 150 does not contact the inner edge of the first insulating member 140. This design ensures a tight seal between the sealing ring 150 and the pole post 130 and end wall 111, while preventing the outer ring of the sealing ring 150 from contacting the inner edge of the first insulating member 140, thus avoiding interference from the first insulating member 140 on the deformation of the sealing ring 150. This structure allows the sealing ring 150 to achieve uniform circumferential deformation, thereby improving the reliability and stability of the sealing effect.

[0062] Please see Figure 7In one embodiment of the single-cell battery 100 of this utility model, the radius of the cylindrical portion 131 is R2. An annular recess 134 is provided on the side of the electrode post 130 facing the electrode assembly 120, with the opening of the annular recess 134 facing the electrode assembly 120. A first limiting portion 133 is connected around the outer periphery of the annular recess 134. The wall of the first limiting portion 133 facing the second limiting portion 132 is connected to the outer peripheral surface of the cylindrical portion 131, and the wall of the first limiting portion 133 away from the second limiting portion 132 is connected to the inner wall of the annular recess 134. The annular recess 134 can be cylindrical, frustum-shaped, or other shapes. Optionally, in this embodiment, the annular recess 134 is approximately frustum-shaped. The radius of the opening of the annular recess 134 is the largest along the height direction. The maximum radius of the annular recess 134 is R4, where R2-R4≥1.65xH.

[0063] By providing an annular recess 134 and ensuring that the difference between the maximum radius R4 of the annular recess 134 and the radius R2 of the cylindrical portion 131 satisfies R2-R4≥1.65×H, sufficient thickness and strength can be provided at the connection point between the first limiting portion 133 and the cylindrical portion 131 (i.e., the root of the first limiting portion 133). This design reduces the probability that the root of the first limiting portion 133 will break due to stress concentration when the internal pressure of the single cell 100 is too high (such as during charging and discharging or under thermal runaway conditions), thereby causing the terminal post 130 to fly outward from the casing 110, thus ensuring the safety and reliability of the single cell 100.

[0064] Please see Figure 8 In one embodiment of the battery pack 200 of this utility model, the battery pack 200 includes a housing 210 and at least one individual battery cell 100. The housing 210 includes a first housing portion 211 and a second housing portion 212, which cover each other to form a receiving space. Multiple individual batteries 100 are housed within the receiving space, and the multiple individual batteries 100 can be connected in series and / or in parallel. The battery pack 200 can be, for example, a battery module, a battery pack, etc.

[0065] Please see Figure 9In one example of the electronic device 300 of this utility model, the electronic device 300 includes a working part 310 and a battery pack 200. The working part 310 is electrically connected to the battery pack 200 to obtain electrical power. The working part 310 can be a unit component capable of obtaining electrical power from the battery pack 200 and performing corresponding work, such as a fan blade rotation unit, a vacuum cleaner suction unit, or a wheel drive unit in an electric vehicle. The electronic device 300 can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This utility model embodiment does not impose special limitations on the above-mentioned electronic device 300. In one embodiment of the electronic device 300 of this utility model, the electronic device 300 is a vehicle, the working part 310 is the vehicle body, and the battery pack 200 is fixedly installed on the vehicle body, thereby providing driving force for the vehicle to operate.

[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A single-cell battery, characterized in that, include: A housing, the housing including an end wall, the end wall including a mounting hole; Electrode assembly, housed within the housing; An electrode post is insulatedly mounted on the end wall and electrically connected to the electrode assembly. The electrode post includes a column portion, a first limiting portion, and a second limiting portion. The column portion passes through the mounting hole. The second limiting portion and the first limiting portion are respectively connected to both ends of the column portion. The second limiting portion is located outside the housing, and the first limiting portion is located inside the housing. Both the second limiting portion and the first limiting portion extend from the column portion to the outer periphery of the end wall. The end wall is sandwiched between the second limiting part and the first limiting part. Along the thickness direction of the end wall, the thickness of the first limiting part is H, the outer contour radius of the first limiting part is R1, and 12mm≤R1≤17mm, 12≤R1 / H≤16.

875.

2. The single-cell battery according to claim 1, characterized in that, The radius of the column part is R2, and R1-R2≤0.6×R2.

3. The single-cell battery according to claim 1, characterized in that, The pole post is a rotating structure, and the second limiting part is a riveted flange; along the thickness direction of the end wall, the outer contour projection of the second limiting part is located inside the outer contour projection of the first limiting part.

4. The single-cell battery according to claim 1, characterized in that, The radius of the column part is R2, and the outer contour radius of the second limiting part is R3, and 0.7mm≤≤1.25mm.

5. The single-cell battery according to claim 1, characterized in that, The single cell also includes a first insulating member, which is disposed on the side of the end wall facing the electrode assembly and extends at least partially between the first limiting portion and the end wall, and forms an annular contact surface with the first limiting portion; the minimum width of the annular contact surface along the radial direction of the first limiting portion is K, and K≥2.5mm.

6. The single-cell battery according to claim 5, characterized in that, The single cell also includes a sealing ring, which is sandwiched between the end wall and the first limiting portion. The outer ring of the sealing ring extends toward the inner edge of the first insulating member and has a gap with the inner edge of the first insulating member.

7. The single-cell battery according to claim 1, characterized in that, The shell is a cylindrical structure with an outer diameter of 46 mm.

8. The single-cell battery according to claim 1, characterized in that, The radius of the column is R2, and an annular recess is provided on the side of the pole facing the electrode assembly. The maximum radius of the annular recess is R4, and R2-R4≥1.65×H.

9. A battery pack, characterized in that, The single-cell battery includes any one of claims 1 to 8.

10. An electronic device, characterized in that, Includes the battery pack as described in claim 9.

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