Single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack. The at least two flow guide convex ribs are convexly arranged on one side, back on to the top cover sheet, of the insulating part of the single battery, and are distributed at intervals along the periphery of the second liquid injection hole, so that the structural strength of the surrounding area of the second liquid injection hole can be improved by the flow guide convex ribs, and the risk of deformation of the insulating part is reduced. Moreover, in the radial direction of the second liquid injection hole, the flow guide convex ribs are sunken in the direction away from the second liquid injection hole, a flow guide runner communicated with the second liquid injection hole is formed between every two adjacent flow guide convex ribs, and the flow guide runners can play a role in guiding the electrolyte in the process that the electrolyte is injected from the second liquid injection hole, so that the liquid injection efficiency is guaranteed. Besides, in the radial direction of the second liquid injection hole, the diversion convex ribs and the second liquid injection hole are arranged at intervals, so that the risk of contact between the electrode assembly and the top cover plate can be reduced, namely the risk of short circuit between the electrode assembly and the top cover plate can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a single cell and a battery pack. Background Technology

[0002] A power battery typically includes electrode assemblies, a metal casing housing the electrode assemblies, and a battery top cover. The battery top cover has an injection hole for injecting electrolyte; the electrolyte is injected into the power battery through this hole. The lower plastic casing of the power battery has a through-hole communicating with the injection hole, through which electrolyte is injected. However, currently, the structural strength of the area around the through-hole on the lower plastic casing is relatively low, making it prone to deformation, and there is a high risk of short circuits between the electrode assemblies and the battery top cover. Utility Model Content

[0003] This application provides a single cell and a battery pack that can improve the structural strength of the insulation components, ensure liquid injection efficiency, and reduce the risk of short circuits in the electrode assembly and top cover plate.

[0004] This application provides a single-cell battery. The single-cell battery includes a housing with a receiving cavity. The single-cell battery also includes an electrode assembly disposed within the receiving cavity. The single-cell battery further includes a top cover plate connected to one side of the housing and sealing the receiving cavity, the top cover plate having a first liquid injection hole. The single-cell battery also includes an insulating member connected to the side of the top cover plate near the electrode assembly, and the insulating member having a second liquid injection hole communicating with the first liquid injection hole. The single-cell battery also includes at least two flow-guiding ribs, each flow-guiding rib protruding from the side of the insulating member opposite to the top cover plate, and the flow-guiding ribs are spaced apart along the outer periphery of the second liquid injection hole, such that a flow channel communicating with the second liquid injection hole is formed between adjacent flow-guiding ribs. In the radial direction of the second liquid injection hole, the flow-guiding ribs are spaced apart from the second liquid injection hole, and the flow-guiding ribs are recessed in a direction away from the second liquid injection hole.

[0005] In one embodiment of this application, a single cell has a height direction and a reference plane perpendicular to the height direction. Along the extension direction of the flow guide rib, the flow guide rib includes a first end point and a second end point. Along the height direction, the orthographic projection of the wall of the second injection hole onto the reference plane has a center point. The line connecting the orthographic projection of the first end point onto the reference plane and the center point forms a first straight line. The line connecting the orthographic projection of the second end point onto the reference plane and the center point forms a second straight line. The angle between the first straight line and the second straight line is θ, which satisfies: 10°≤θ≤150°.

[0006] In one embodiment of this application, the included angle θ between the first straight line and the second straight line satisfies 30°≤θ≤60°.

[0007] In an embodiment of the present application, the diameter of the second liquid injection hole is D mm, and the minimum distance between the diversion rib and the second liquid injection hole is a mm, satisfying: 0.01 < a / D ≤ 0.67, or, 0.1 < a / D < 0.45.

[0008] In an embodiment of the present application, the minimum distance between the diversion rib and the second liquid injection hole is a mm, satisfying: 0.2 ≤ a ≤ 2; and / or, the diameter of the second liquid injection hole is D mm, satisfying: 3 ≤ D ≤ 18.

[0009] In an embodiment of the present application, the single cell has a length direction; the insulating member is provided with an explosion-proof valve boss, and the explosion-proof valve boss and at least two diversion ribs are spaced apart along the length direction; wherein, the dimension of the top cover sheet in the length direction is L mm, and the minimum distance between the diversion rib and the explosion-proof valve boss in the length direction is L1 mm, satisfying: 0.005 ≤ L1 / L < 1, or, 0.005 ≤ L1 / L ≤ 0.91.

[0010] In an embodiment of the present application, the single cell has a length direction; the insulating member is provided with an explosion-proof valve boss, and the explosion-proof valve boss and at least two diversion ribs are spaced apart along the length direction; wherein, the minimum distance between the diversion rib and the explosion-proof valve boss in the length direction is L1 mm, satisfying: 3 ≤ L1 ≤ 500; or, the dimension of the top cover sheet in the length direction is L mm, satisfying: 10 ≤ L ≤ 600.

[0011] In an embodiment of the present application, the single cell has a length direction; the single cell further includes a pole column, the pole column is disposed on the top cover sheet and the insulating member, and the pole column and at least two diversion ribs are spaced apart along the length direction; wherein, the dimension of the top cover sheet in the length direction is L mm, and the minimum distance between the diversion rib and the end of the pole column for connecting the electrode assembly in the length direction is L2 mm, satisfying: 0.006 < L2 / L < 1, or, 0.006 < L2 / L ≤ 0.83.

[0012] In an embodiment of the present application, the single cell has a length direction; the single cell further includes a pole column, the pole column is disposed on the top cover sheet and the insulating member, and the pole column and at least two diversion ribs are spaced apart along the length direction; wherein, the minimum distance between the diversion rib and the end of the pole column for connecting the electrode assembly in the length direction is L2 mm, satisfying: 4 ≤ L2 ≤ 500; or, the dimension of the top cover sheet in the length direction is L mm, satisfying: 10 ≤ L ≤ 600.

[0013] Correspondingly, the present application further provides a battery pack, including a box body and the single cell as described in the above embodiments, and the single cell is disposed in the box body.

[0014] The beneficial effects of this application are as follows: Unlike the prior art, this application provides a single-cell battery and a battery pack. The insulating component of the single-cell battery has at least two guiding ribs protruding from the side facing away from the top cover plate. These guiding ribs are spaced apart along the outer periphery of the second injection hole. The guiding ribs can improve the structural strength of the area surrounding the second injection hole and reduce the risk of deformation of the insulating component. Furthermore, in the radial direction of the second injection hole, the guiding ribs are recessed away from the second injection hole, and a flow channel communicating with the second injection hole is formed between two adjacent guiding ribs. This flow channel can guide the electrolyte during the injection process from the second injection hole, thus helping to ensure injection efficiency. In addition, the radial direction of the second injection hole, with the guiding ribs spaced apart from it, means that the opening area of ​​the second injection hole is smaller, and less of the top cover plate is exposed. This reduces the risk of contact between the electrode assembly and the top cover plate, i.e., reduces the risk of short circuit between the electrode assembly and the top cover plate. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0017] Figure 2 yes Figure 1 The diagram shows the exploded structure of a single battery cell.

[0018] Figure 3 This is a schematic diagram of the structure of one embodiment of the top cover assembly of this application;

[0019] Figure 4 yes Figure 3 A bottom view of the top cover assembly shown.

[0020] Figure 5 yes Figure 3 A structural schematic diagram of the top cover assembly from another perspective;

[0021] Figure 6 yes Figure 4 The diagram shows the structure of area A of the top cover assembly.

[0022] Figure 7 This is a schematic diagram of an embodiment of the orthographic projection of the first endpoint of the guide rib in this application onto a reference plane;

[0023] Figure 8This is a schematic diagram of an embodiment of the orthographic projection of the second endpoint of the guide rib in the reference plane.

[0024] Explanation of reference numerals in the attached figures:

[0025] 10 Single cell; 11 Casing; 111 Receptacle; 12 Electrode assembly; 20 Top cover assembly; 21 Top cover sheet; 211 First liquid injection hole; 22 Insulator; 221 Second liquid injection hole; 222 Explosion-proof valve boss; 23 Guide rib; 23a First end point; 23b Second end point; 231 Guide channel; 24 Terminal post. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0027] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," "stacked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] This application provides a single-cell battery and a battery pack, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0029] To address the technical problems of low structural strength, easy deformation, and high short-circuit risk of electrode components and battery top cover in existing technologies, one embodiment of this application provides a single-cell battery. The single-cell battery includes a housing with a receiving cavity. The single-cell battery also includes an electrode assembly disposed within the receiving cavity. The single-cell battery further includes a top cover plate connected to one side of the housing and sealing the receiving cavity, the top cover plate having a first liquid injection hole. The single-cell battery also includes an insulating member connected to the side of the top cover plate near the electrode assembly, and the insulating member having a second liquid injection hole communicating with the first liquid injection hole. The single-cell battery also includes at least two flow-guiding ribs, each flow-guiding rib protruding from the side of the insulating member opposite to the top cover plate, and the flow-guiding ribs are spaced apart along the outer periphery of the second liquid injection hole, such that a flow channel communicating with the second liquid injection hole is formed between adjacent flow-guiding ribs. Specifically, in the radial direction of the second liquid injection hole, the flow-guiding ribs are spaced apart from the second liquid injection hole, and the flow-guiding ribs are recessed in a direction away from the second liquid injection hole. This will be described in detail below.

[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application.

[0031] In one embodiment, the battery pack includes a housing and a plurality of individual battery cells 10 housed within the housing. The individual battery cells 10 include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit the specific types. The battery pack provides power to an electrical device. The electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; 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.

[0032] The following describes the single-cell battery 10 of the present application.

[0033] Please refer to the following: Figures 2 to 5 , Figure 2 yes Figure 1 The diagram shows the exploded structure of a single battery cell. Figure 3 This is a schematic diagram of the structure of one embodiment of the top cover assembly of this application. Figure 4 yes Figure 3 The diagram shows a bottom view of the top cover assembly. Figure 5 yes Figure 3A structural schematic diagram of the top cover assembly from another perspective.

[0034] In one embodiment, the single-cell battery 10 includes a housing 11 having a receiving cavity 111. The single-cell battery 10 also includes an electrode assembly 12 disposed within the receiving cavity 111. The electrode assembly 12 is formed by stacking and / or winding a positive electrode sheet, a negative electrode sheet, and a separator. The single-cell battery 10 also includes a top cover assembly 20 connected to one side of the housing 11 and sealing the receiving cavity 111.

[0035] The top cover assembly 20 includes a top cover plate 21, which is connected to one side of the housing 11 and seals the receiving cavity 111. The top cover assembly 20 also includes an insulating member 22, which is connected to the side of the top cover plate 21 near the electrode assembly 12. The top cover plate 21 has a first liquid injection hole 211, and the insulating member 22 has a second liquid injection hole 221 communicating with the first liquid injection hole 211. Electrolyte is injected into the receiving cavity 111 sequentially through the first liquid injection hole 211 and the second liquid injection hole 221.

[0036] Please refer to the following: Figures 6 to 8 , Figure 6 yes Figure 4 The diagram shows the structure of region A of the top cover assembly. Figure 7 This is a schematic diagram of an embodiment of the orthographic projection of the first endpoint of the guide rib in this application onto a reference plane. Figure 8 This is a schematic diagram of an embodiment of the orthographic projection of the second endpoint of the guide rib in the reference plane.

[0037] The top cover assembly 20 also includes at least two flow guide ribs 23. Each flow guide rib 23 protrudes from the side of the insulating member 22 facing away from the top cover plate 21, and the flow guide ribs 23 are distributed at intervals along the outer periphery of the second injection hole 221, such that a flow channel 231 communicating with the second injection hole 221 is formed between two adjacent flow guide ribs 23. In the radial direction of the second injection hole 221, the flow guide ribs 23 are spaced apart from the second injection hole 221, and the flow guide ribs 23 are recessed in a direction away from the second injection hole 221.

[0038] In this embodiment, the insulating component 22 of the single battery 10 has at least two guiding ribs 23 protruding on the side facing away from the top cover plate 21. Each guiding rib 23 is distributed at intervals along the outer periphery of the second injection hole 221. The guiding ribs 23 can improve the structural strength of the area around the second injection hole 221 and reduce the risk of deformation of the insulating component 22. Furthermore, in the radial direction of the second injection hole 221, the guiding ribs 23 are recessed in a direction away from the second injection hole 221. A guiding channel 231 communicating with the second injection hole 221 is formed between two adjacent guiding ribs 23. The guiding channel 231 can guide the electrolyte during the injection of electrolyte from the second injection hole 221, thus helping to ensure the injection efficiency. Furthermore, in the radial direction of the second injection hole 221, the guide rib 23 is spaced apart from the second injection hole 221, which means that the opening area of ​​the second injection hole 221 is smaller and the top cover plate 21 exposed by the second injection hole 221 is less, thus reducing the risk of contact between the electrode assembly 12 and the top cover plate 21, that is, reducing the risk of short circuit between the electrode assembly 12 and the top cover plate 21.

[0039] It should be noted that the single cell 10 has a height direction Z, the top cover assembly 20 covers one side of the housing 11 along the height direction Z, and the top cover sheet 21 and the insulating member 22 are stacked along the height direction Z. The radial direction of the second liquid injection hole 221 is perpendicular to this height direction Z.

[0040] In one embodiment, the single cell 10 further has a reference plane O perpendicular to the height direction Z. Along the extending direction of the flow guide rib 23, the flow guide rib 23 includes a first endpoint 23a and a second endpoint 23b. Specifically, the first endpoint 23a and the second endpoint 23b are the outermost positions of the flow guide rib 23 in its extending direction; along the extending direction of the flow guide rib 23, the distance between the first endpoint 23a and the midpoint of the flow guide rib 23, and the distance between the second endpoint 23b and the midpoint of the flow guide rib 23, are both greater than the distances between other positions of the flow guide rib 23 and the midpoint. Along the height direction Z, the orthographic projection of the wall of the second injection hole 221 onto the reference plane O has a center point Q; the line connecting the orthographic projection of the first endpoint 23a onto the reference plane O and the center point Q forms a first straight line M; and the line connecting the orthographic projection of the second endpoint 23b onto the reference plane O and the center point Q forms a second straight line N.

[0041] It is understandable that the reference plane O can be the surface of the top cover 21 facing the insulating component 22, etc. The center point Q is the geometric center of the orthographic projection of the wall of the second injection hole 221 onto the reference plane O. For example, when the orthographic projection of the wall of the second injection hole 221 onto the reference plane O is circular, the center point Q is the center of the circle. The following explanation uses the example of the orthographic projection of the wall of the second injection hole 221 onto the reference plane O being circular. When the orthographic projection of the wall of the second injection hole 221 onto the reference plane O is square, the center point Q is the intersection of the diagonals of the square.

[0042] The angle between the first line M and the second line N is θ, which satisfies: 10°≤θ≤150°. For example, it can be any value among 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc. In this embodiment, by reasonably setting the included angle between the first straight line M and the second straight line N, it can ensure that the flow channel 231 between two adjacent flow guide ribs 23 has sufficient flow area. The flow channel 231 guides the electrolyte injection, which helps to ensure the injection efficiency and reduce the risk of blockage of the first injection hole 211 and the second injection hole 221. On the other hand, it can reduce the manufacturing difficulty of the flow guide rib 23 and help to reduce the manufacturing cost of the single cell 10.

[0043] Furthermore, the included angle θ between the first straight line M and the second straight line N satisfies 30°≤θ≤60°. In this way, this embodiment can maximize the flow area of ​​the flow channel 231 between two adjacent flow guide ribs 23, guiding the electrolyte injection, thus helping to ensure injection efficiency and reducing the risk of blockage of the first injection hole 211 and the second injection hole 221; moreover, this embodiment can minimize the manufacturing difficulty of the flow guide ribs 23, which is beneficial to reducing the manufacturing cost of the single cell 10.

[0044] In one embodiment, the diameter of the second injection hole 221 is D mm, and the minimum distance between the guide rib 23 and the second injection hole 221 is a mm, satisfying: 0.01 ​

[0045] In this embodiment, by reasonably setting the minimum distance between the guide rib 23 and the second injection hole 221, the guide rib 23 can improve the structural strength of the area around the second injection hole 221 and reduce the risk of deformation of the insulating component 22. On the other hand, the opening area of ​​the second injection hole 221 can be minimized, so that the top cover plate 21 exposed by the second injection hole 221 is less, which can reduce the risk of short circuit caused by contact between the electrode assembly 12 and the top cover plate 21.

[0046] Furthermore, the minimum distance 'a' mm between the guide rib 23 and the second injection hole 221 satisfies: 0.1

[0047] ​Optionally, the diameter D mm of the second injection hole 221 satisfies 3 ≤ D ≤ 18, for example, it can be 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9. 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9, 10.0, 10.1, 10.2, 10.3, 10.4, 10.5, 10.6, 10.7, 10.8, 10.9, 11.0, 11 1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7, 11.8, 11.9, 12.0, 12.1, 12.2, 12.3, 12.4, 12.5, 12.6, 12.7, 12.8, 12.9, 13.0, 13.1, 13.2, 13.3, 13.4, 13.5, 13.6, 13.7, 13.8, 13.9, 14.0, 14.1, 14.2, 14.3, 14.4, 14.5, 14. Any value from 6, 14.7, 14.8, 14.9, 15.0, 15.1, 15.2, 15.3, 15.4, 15.5, 15.6, 15.7, 15.8, 15.9, 16.0, 16.1, 16.2, 16.3, 16.4, 16.5, 16.6, 16.7, 16.8, 16.9, 17.0, 17.1, 17.2, 17.3, 17.4, 17.5, 17.6, 17.7, 17.8, 17.9, 18.0.

[0048] In one embodiment, the minimum distance a mm between the guide rib 23 and the second injection hole 221 satisfies: 0.2≤a≤2, and can be any value among 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and 2.0.

[0049] In this embodiment, by reasonably setting the minimum distance between the guide rib 23 and the second injection hole 221, the guide rib 23 can improve the structural strength of the area around the second injection hole 221 and reduce the risk of deformation of the insulating component 22. On the other hand, the opening area of ​​the second injection hole 221 can be minimized, so that the top cover plate 21 exposed by the second injection hole 221 is less, which can reduce the risk of short circuit caused by contact between the electrode assembly 12 and the top cover plate 21.

[0050] In one embodiment, the insulating member 22 is provided with an explosion-proof valve boss 222. The explosion-proof valve boss 222 is disposed opposite to the explosion-proof valve on the top cover plate 21. The explosion-proof valve boss 222 has several through holes. When the explosion-proof valve is opened, the high-temperature and high-pressure gas inside the single cell 10 is discharged from the explosion-proof valve through the through holes on the explosion-proof valve boss 222.

[0051] The single battery cell 10 has a length direction X perpendicular to the height direction Z. The explosion-proof valve boss 222 and the at least two flow-guiding ribs 23 are spaced apart along the length direction X. The top cover plate 21 has a dimension L mm in the length direction X, and the minimum distance between the flow-guiding ribs 23 and the explosion-proof valve boss 222 in the length direction X is L1 mm, satisfying: 0.005 ≤ L1 / L < 1. For example, it can be 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0. 21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.7 Any value from 4, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc.

[0052] By using the above method, this embodiment reasonably sets the minimum distance between the guide rib 23 and the explosion-proof valve boss 222, minimizing the possibility that an excessively small minimum distance between them would affect the detonation pressure of the explosion-proof valve. If the minimum distance between the guide rib 23 and the explosion-proof valve boss 222 is too small, the electrolyte injected through the second injection hole 221 can easily enter the explosion-proof valve boss 222, causing the actual detonation pressure of the explosion-proof valve to be lower than the design value.

[0053] In one embodiment, the minimum distance L1 between the flow guide rib 23 and the explosion-proof valve boss 222 in the length direction X is... mm satisfies 3≤L1≤500, and can be any value from 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, etc.

[0054] By using the above method, this embodiment reasonably sets the minimum distance between the guide rib 23 and the explosion-proof valve boss 222, minimizing the possibility that an excessively small minimum distance between them would affect the detonation pressure of the explosion-proof valve. If the minimum distance between the guide rib 23 and the explosion-proof valve boss 222 is too small, the electrolyte injected through the second injection hole 221 can easily enter the explosion-proof valve boss 222, causing the actual detonation pressure of the explosion-proof valve to be lower than the design value.

[0055] Optionally, the dimension L (mm) of the top cover plate 21 in the length direction X also satisfies 10 ≤ L ≤ 600, for example, it can be 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 30 Any value from 0, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, etc.

[0056] In one embodiment, the single cell 10 further includes a pole post 24. The pole post 24 is disposed on the top cover sheet 21 and the insulating member 22, and the pole post 24 and at least two of the above-mentioned flow guiding ribs 23 are distributed at intervals in the length direction X. Among them, the size of the top cover sheet 21 in the length direction X is L mm, and the minimum distance in the length direction X between the flow guiding ribs 23 and the pole post 24 for connecting the ends of the electrode assembly 12 is L2 mm, satisfying: 0.006 < L2 / L < 1. For example, it can be any value among 0.0067, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc.

[0057] By the above method, in this embodiment, by reasonably setting the minimum distance between the flow guiding rib 23 and the pole post 24, it is beneficial to ensure the structural strength of the top cover sheet 21 between the first liquid injection hole 211 and the pole post 24. If the minimum distance between the flow guiding rib 23 and the pole post 24 is too small, it means that the distance between the first liquid injection hole 211 and the pole post 24 is too small, which will result in too small structural strength of the top cover sheet 21 between the first liquid injection hole 211 and the pole post 24, and problems such as deformation are likely to occur.

[0058] In one embodiment, the guide rib 23 and the electrode post 24 are used to connect the minimum distance L2 in the length direction X between the ends of the electrode assembly 12. mm satisfies: 4≤L2≤500, for example, it can be any value from 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, etc.

[0059] By using the above method, this embodiment, through reasonably setting the minimum distance between the guide rib 23 and the pole post 24, helps to ensure the structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24. If the minimum distance between the guide rib 23 and the pole post 24 is too small, it means that the distance between the first injection hole 211 and the pole post 24 is too small, which will lead to insufficient structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24, making it prone to deformation and other problems.

[0060] The performance of the technical solutions provided in the embodiments of this application is evaluated below.

[0061] Examples 1 to 11 are provided. Examples 1 to 9 satisfy 10°≤θ≤150°, while examples 10 and 11 do not satisfy 10°≤θ≤150°. See the table below for specific parameters and test results.

[0062] Table 1

[0063] θ Injection efficiency Example 1 10.0° 99.8％ Example 2 15.0° 99.1％ Example 3 30.0° 98.9％ Example 4 45.0° 98.8％ Example 5 60.0° 98.6％ Example 6 90.0° 98.5％ Example 7 120.0° 98.3％ Example 8 130.0° 98.2％ Example 9 150.0° 98.0％ Example 10 1.0° 99.8％ Example 11 180.0° 92.0％

[0064] It should be noted that the angle θ can be measured by directly using a measuring tool, or by using a CCD (charge coupled device) camera or other imaging element to obtain an image of the guide rib 23, and then using a measuring tool to measure the angle θ on the image. No limitation is made here.

[0065] The method for measuring the electrolyte injection efficiency is as follows: The lithium-ion battery prepared in the above example is subjected to electrolyte injection efficiency measurement. The insulating component in the lithium-ion battery is the same as the one described in this application. The lithium-ion battery is placed in an electrolyte injection machine. The injection machine first evacuates the inside of the lithium-ion battery to a pressure below -90 kPa. At this point, the electrolyte is already stored in the injection cup. Due to the negative pressure inside the lithium-ion battery, the electrolyte flows into the battery. Then, the injection machine performs alternating positive and negative pressure cycles (positive pressure 180 kPa (30-60 s), negative pressure -60 kPa (3-15 s), 4-12 cycles) to ensure the electrolyte is fully injected into the lithium-ion battery. The time required for the entire electrolyte injection process is recorded as Tmin. A conventional insulating component is used in the lithium-ion battery (i.e., no structure is provided at the through-hole of the insulating component), and the same electrolyte injection operation is performed on this lithium-ion battery. The time required for the entire electrolyte injection process is recorded as tmin. The electrolyte injection efficiency = t / T × 100%.

[0066] As can be seen, Examples 1 to 11 above have high electrolyte injection efficiency. In particular, Examples 1 to 9 not only ensure that the flow channel 231 between two adjacent flow guide ribs 23 has sufficient flow area, and the flow channel 231 guides the electrolyte injection, thus helping to ensure electrolyte injection efficiency and reduce the risk of blockage of the first injection hole 211 and the second injection hole 221, but also reduce the manufacturing difficulty of the flow guide rib 23, which is beneficial to reducing the manufacturing cost of the single cell 10. Although Example 10 has high electrolyte injection efficiency, the angle θ of the flow guide rib 23 in Example 10 is small, resulting in higher manufacturing difficulty. In Example 11, the angle θ of the flow guide rib 23 is large, and the electrolyte injection efficiency of Example 11 is lower than that of Examples 1 to 9.

[0067] Examples 12 to 23 are provided. Examples 12 to 21 satisfy 0.01.

[0068] Table 2

[0069]

[0070] It should be noted that the measurement methods for the diameter of the second injection hole 221 and the minimum distance between the guide rib 23 and the second injection hole 221 can be: directly using a measuring tool to measure, or using a camera element such as a CCD (charge coupled device) camera to obtain an image of the guide rib 23 and the second injection hole 221, and then using a measuring tool to measure on the image. No limitation is made here.

[0071] ​The flatness of the insulating component 22 in the table above refers to the flatness of the insulating component 22 surrounding the second injection hole 221. The flatness of the insulating component 22 surrounding the second injection hole 221 characterizes the structural strength of the area surrounding the second injection hole 221. The smaller the flatness of the insulating component 22 surrounding the second injection hole 221, the higher the structural strength of the area surrounding the second injection hole 221; conversely, the larger the flatness of the insulating component 22 surrounding the second injection hole 221, the lower the structural strength of the area surrounding the second injection hole 221. The flatness of the insulating component 22 can be measured as follows: The flatness of the lithium-ion battery prepared in the example above is measured. After the prepared lithium-ion battery has been left to stand for a period of time, it is disassembled. The disassembled insulating component 22 is placed on a platform, and the base of a height gauge is placed on the platform. The sliding rod of the height gauge is adjusted so that it contacts the surface of the insulating component 22 surrounding the second injection hole 221. The height gauge is moved, and readings at multiple points are recorded. The flatness of the insulating component 22 is calculated by calculating the difference between the maximum and minimum readings.

[0072] As can be seen, the insulating components 22 in Examples 12 to 23 all have relatively small flatness. In particular, the insulating components 22 in Examples 12 to 21 have relatively smaller flatness. On the one hand, this ensures that the guiding ribs 23 can improve the structural strength of the area around the second injection hole 221 and reduce the risk of deformation of the insulating component 22. On the other hand, it minimizes the opening area of ​​the second injection hole 221, so that less of the top cover plate 21 is exposed, which can reduce the risk of short circuit due to contact between the electrode assembly 12 and the top cover plate 21. Although the insulating component 22 in Example 22 has relatively small flatness, the minimum distance between the guiding ribs 23 and the second injection hole 221 in Example 22 is small, resulting in higher manufacturing difficulty. In Example 23, the minimum distance between the guiding ribs 23 and the second injection hole 221 in Example 23 is larger. Compared with Examples 12 to 21, the flatness of the insulating component 22 in Example 23 is larger, which means that the structural strength of the area around the second injection hole 221 in Example 23 is lower.

[0073] Examples 24 to 36 are provided. Examples 24 to 35 satisfy 0.005 ≤ L1 / L < 1, while example 36 does not satisfy 0.005 ≤ L1 / L < 1. See the table below for specific parameters and test results.

[0074] Table 3

[0075]

[0076]

[0077] It should be noted that the measurement method for the dimension of the top cover sheet 21 in the length direction X and the minimum distance between the flow guiding rib 23 and the explosion-proof valve boss 222 in the length direction X can be: directly measuring with a measuring tool, or using imaging elements such as a CCD (charge coupled device) camera to obtain images of the top cover sheet 21, the flow guiding rib 23, and the explosion-proof valve boss 222, and then using a measuring tool to measure on the image, which is not limited herein.

[0078] The measurement method for the explosion-proof valve detonation pressure can be: inserting a hose through the first liquid injection hole 211 of the single cell 10, and using sealant to seal the first liquid injection hole 211, and inflating the inside of the single cell 10 (such as an inert gas like helium). The hose is externally connected to a pressure gauge, and the internal pressure of the single cell 10 is displayed through the pressure gauge. Read the internal pressure of the single cell 10 displayed by the pressure gauge when the explosion-proof valve detonates to obtain the actual detonation pressure of the explosion-proof valve.

[0079] It can be seen that the above Examples 24 to 36 all have good explosion-proof valve detonation pressures. In particular, in the above Examples 24 to 35, by reasonably setting the minimum distance between the flow guiding rib 23 and the explosion-proof valve boss 222, it is possible to avoid as much as possible that the minimum distance between the flow guiding rib 23 and the explosion-proof valve boss 222 is too small and affects the detonation pressure of the explosion-proof valve. Compared with Examples 24 to 35, in Example 36, the minimum distance between the flow guiding rib 23 and the explosion-proof valve boss 222 is smaller, resulting in a smaller actual detonation pressure of the explosion-proof valve.

[0080] Examples 37 to 50 are provided. Examples 37 to 49 satisfy 0.006 < L2 / L < 1, and Example 50 does not satisfy 0.006 < L2 / L < 1. The specific parameters and test results are shown in the following table.

[0081] Table 4

[0082]

[0083] It should be noted that the measurement method for the minimum distance L2 mm between the flow guiding rib 23 and the pole 24 can be: directly measuring with a measuring tool, or using imaging elements such as a CCD (charge coupled device) camera to obtain images of the flow guiding rib 23 and the pole 24, and then using a measuring tool to measure on the image, which is not limited herein.

[0084] The flatness of the top cover plate 21 between the first injection hole 211 and the pole post 24 characterizes the structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24. Specifically, the smaller the flatness of the top cover plate 21 between the first injection hole 211 and the pole post 24, the higher the structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24; conversely, the larger the flatness of the top cover plate 21 between the first injection hole 211 and the pole post 24, the lower the structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24. The flatness of the top cover plate 21 between the first injection hole 211 and the terminal post 24 can be measured as follows: The flatness of the lithium-ion battery prepared in the above example is measured. After the prepared lithium-ion battery is left to stand for a period of time, it is disassembled. The disassembled top cover plate 21 is placed on a platform. The base of the height gauge is placed on the platform. The sliding rod of the height gauge is adjusted so that it contacts the surface of the top cover plate 21 between the first injection hole 211 and the terminal post 24. The height gauge is moved and the readings of multiple points are recorded. The flatness of the top cover plate 21 between the first injection hole 211 and the terminal post 24 is calculated by calculating the difference between the maximum and minimum readings.

[0085] It can be seen that the top cover plate 21 between the first injection hole 211 and the pole post 24 in Examples 37 to 50 all have relatively small flatness. In particular, the top cover plate 21 between the first injection hole 211 and the pole post 24 in Examples 37 to 49 has even smaller flatness. By reasonably setting the minimum distance between the guide rib 23 and the pole post 24, it is beneficial to ensure the structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24. Compared with Examples 37 to 49, the minimum distance between the guide rib 23 and the pole post 24 in Example 50 is smaller, and the top cover plate 21 between the first injection hole 211 and the pole post 24 has a larger flatness, which means that the structural strength of the top cover plate 21 between the first injection hole 211 and the pole post 24 is lower.

[0086] In summary, this application provides a single-cell battery and a battery pack. The single-cell battery has at least two guiding ribs protruding from the side of the insulating component facing away from the top cover plate. These guiding ribs are spaced apart along the outer periphery of the second injection hole. The guiding ribs improve the structural strength of the area surrounding the second injection hole and reduce the risk of deformation of the insulating component. Furthermore, in the radial direction of the second injection hole, the guiding ribs are recessed away from the second injection hole, forming a flow channel communicating with the second injection hole between adjacent guiding ribs. This flow channel guides the electrolyte during injection from the second injection hole, thus improving injection efficiency. Additionally, the spaced-apart arrangement of the guiding ribs from the second injection hole in the radial direction means that the opening area of ​​the second injection hole is smaller, and less of the top cover plate is exposed. This reduces the risk of contact between the electrode assembly and the top cover plate, thereby reducing the risk of short circuit between the electrode assembly and the top cover plate.

[0087] The single-cell battery and battery pack provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A single-cell battery, characterized in that, include: The housing has a receiving cavity; An electrode assembly is disposed within the accommodating cavity; A top cover plate is connected to one side of the housing and seals the accommodating cavity; the top cover plate has a first liquid injection hole. An insulating component is connected to the side of the top cover plate near the electrode assembly, and the insulating component has a second injection hole communicating with the first injection hole; and At least two flow guide ribs are provided, each of which protrudes from the side of the insulating member facing away from the top cover plate, and each of the flow guide ribs is distributed at intervals along the outer periphery of the second injection hole, such that a flow channel communicating with the second injection hole is formed between two adjacent flow guide ribs. In the radial direction of the second injection hole, the guide rib is spaced apart from the second injection hole, and the guide rib is recessed in a direction away from the second injection hole.

2. The single-cell battery according to claim 1, characterized in that, The single cell has a height direction and a reference plane perpendicular to the height direction. Along the extension direction of the flow guide rib, the flow guide rib includes a first end point and a second end point. Along the height direction, the orifice wall of the second injection hole has a center point in the orthogonal projection of the reference plane. The first endpoint is connected to the center point in the orthogonal projection of the reference plane to form a first straight line. The second endpoint is connected to the center point in the orthogonal projection of the reference plane to form a second straight line. The angle between the first straight line and the second straight line is θ, which satisfies: 10°≤θ≤150°.

3. The single-cell battery according to claim 2, characterized in that, The included angle θ between the first straight line and the second straight line satisfies 30°≤θ≤60°.

4. The single-cell battery according to any one of claims 1 to 3, characterized in that, The diameter of the second injection hole is D mm, and the minimum distance between the guide rib and the second injection hole is a mm, satisfying: 0.01 mm.

5. The single-cell battery according to any one of claims 1 to 3, characterized in that... The minimum distance between the guide rib and the second injection hole is a mm, satisfying: 0.2 ≤ a ≤ 2; and / or, The diameter of the second injection hole is D mm, which satisfies: 3≤D≤18.

6. The single-cell battery according to any one of claims 1 to 3, characterized in that, The single battery cell has a length direction; the insulating component is provided with an explosion-proof valve boss, and the explosion-proof valve boss and the at least two flow-guiding ribs are distributed at intervals along the length direction; Wherein, the top cover plate has a dimension of L mm in the length direction, and the minimum distance between the guide rib and the explosion-proof valve boss in the length direction is L1 mm, satisfying: 0.005≤L1 / L<1, or 0.005≤L1 / L≤0.

91.

7. The single-cell battery according to any one of claims 1 to 3, characterized in that, The single battery cell has a length direction; the insulating component is provided with an explosion-proof valve boss, and the explosion-proof valve boss and the at least two flow-guiding ribs are distributed at intervals along the length direction; ​ Among them, the minimum distance between the flow guiding rib and the explosion-proof valve boss in the length direction is L1 mm, satisfying: 3 ≤ L1 ≤ 500; or, The dimension of the top cover sheet in the length direction is L mm, satisfying: 10 ≤ L ≤ 600.

8. The single cell according to any one of claims 1 to 3, characterized in that The single cell has a length direction; the single cell further includes a pole column, the pole column is disposed on the top cover sheet and the insulating member, and the pole column and the at least two flow guiding ribs are spaced apart along the length direction; Among them, the dimension of the top cover sheet in the length direction is L mm, and the minimum distance between the flow guiding rib and the pole column for connecting the ends of the electrode assembly in the length direction is L2 mm, satisfying: 0.006 < L2 / L < 1, or, 0.006 < L2 / L ≤ 0.

83.

9. The single cell according to any one of claims 1 to 3, characterized in that The single cell has a length direction; the single cell further includes a pole column, the pole column is disposed on the top cover sheet and the insulating member, and the pole column and the at least two flow guiding ribs are spaced apart along the length direction; Among them, the minimum distance between the flow guiding rib and the pole column for connecting the ends of the electrode assembly in the length direction is L2 mm, satisfying: 4 ≤ L2 ≤ 500; or, The dimension of the top cover sheet in the length direction is L mm, satisfying: 10 ≤ L ≤ 600.

10. A battery pack, characterized in that, Comprising a box body and the single cell according to any one of claims 1 to 9, the single cell is disposed in the box body.

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