Battery

Abstract

The utility model provides a battery. The battery comprises a cover plate, a battery cell and a plugging assembly, a liquid injection through hole is formed in the cover plate; the battery cell is arranged on one side of the cover plate along a first direction; the plugging assembly penetrates through the liquid injection through hole, and the two ends, in the first direction, of the plugging assembly abut against the two sides, in the first direction, of the cover plate correspondingly; the length of the plugging assembly in the first direction is A; the thickness of the cover plate in the first direction is set to be B; the value range of the ratio A / B of A to B is 2 < = A / B < = 5. The value range of A / B is set to be larger than or equal to 2 and smaller than or equal to 5, the length of the plugging assembly in the first direction and the thickness of the cover plate in the first direction can be designed and controlled within a reasonable range, the two ends of the plugging assembly have enough binding force in the thickness direction, and the plugging assembly can be firmly fixed to the cover plate. And the end part extruded on the cover plate is formed by deformation of one end, facing the battery cell, of the plugging assembly, so that the plugging assembly can be firmly fixed on the cover plate together with one end, far away from the battery cell, of the plugging assembly.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery. Background Art

[0002] Battery injection is one of the processes in the battery production process. Battery injection is to inject the electrolyte solution into the battery cell through the injection hole to form an ion channel, so that there are enough ions to migrate between the positive and negative electrodes during the battery charging or discharging process to achieve reversible circulation.

[0003] In the prior art, the plugging assembly is riveted to the injection hole after the electrolyte solution is injected, so as to seal the injection hole and prevent the electrolyte solution from flowing out of the injection hole. However, the length of the plugging assembly riveted to the battery cover in the prior art is not reasonably designed with the thickness of the battery cover, and there is a situation where the plugging assembly is not firmly riveted, resulting in a poor sealing effect. Utility Model Content

[0004] The present application provides a battery for improving the situation in which the internal space utilization of the battery is low and the sealing effect is poor due to the unreasonable design of the height of the sealing component and the thickness of the battery cover.

[0005] The present application provides a battery, comprising:

[0006] A cover plate, wherein a liquid injection through hole is provided on the cover plate;

[0007] A battery cell, wherein the battery cell is arranged on one side of the cover plate along a first direction, wherein the first direction is an extending direction of the liquid injection through hole;

[0008] A plugging component, wherein the plugging component passes through the liquid injection through hole, and two ends of the plugging component along the first direction are respectively abutted against two sides of the cover plate along the first direction, so that the plugging component is fixed on the cover plate and blocks the liquid injection through hole;

[0009] Wherein, the length of the blocking component along the first direction is assumed to be A;

[0010] Assume that the thickness of the cover plate along the first direction is B;

[0011] The ratio A / B of A to B has a value range of 2≤A / B≤5.

[0012] In the above technical solution, by setting the ratio A / B of the length A of the plugging component along the first direction to the thickness B of the cover plate along the first direction to be in the range of 2≤A / B≤5, the length of the plugging component along the first direction and the thickness of the cover plate along the first direction can be controlled within a reasonable range, so that both ends of the plugging component have sufficient binding force in the thickness direction to firmly fix the plugging component on the cover plate. In addition, the deformation of the end of the plugging component facing the battery cell to form an end pressed on the cover plate can firmly fix the plugging component on the cover plate together with the end of the plugging component away from the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A top view of a cover plate in a battery provided in an embodiment of the present application;

[0014] Figure 2 A schematic diagram of the internal structure of a battery provided in an embodiment of the present application;

[0015] Figure 3 A schematic diagram of the structure of a sealing nail in a battery provided in an embodiment of the present application;

[0016] Figure 4 A schematic diagram of the structure of a forming part in a battery provided in an embodiment of the present application;

[0017] Figure 5 A schematic diagram of the structure of the extrusion part of the battery provided in the embodiment of the present application;

[0018] Figure 6 A schematic diagram of the structure of a battery before the plugging assembly is fixed on the cover plate provided in an embodiment of the present application;

[0019] Figure 7 A schematic diagram of the structure of a sealing nail in a battery provided in an embodiment of the present application;

[0020] Figure 8 A schematic diagram of the structure of an insulating member in a battery provided in an embodiment of the present application;

[0021] Fig. 9 A schematic diagram of the structure of the side wall of the hollow cavity in the battery provided in an embodiment of the present application;

[0022] Fig.10 A schematic diagram of the structure annotation of a groove in a battery provided in an embodiment of the present application.

[0023] In the figure: 1, cover plate; 11, injection hole; 12, groove; 13, sealing groove; 14, avoidance groove; 2, plugging assembly; 21, sealing nail; 211, flange; 212, deformation part; 213, main body; 22, forming part; 221, extrusion part; 222, abutment part; 23, accommodating space; 231, cavity; 232, raised part; 2321, first surface; 2322, second surface; 24, core-pulling nail; 25, sealing plate; 3, sealing member; 4, battery cell; 6, insulating member; 61, avoidance hole; A, length of the plugging assembly along the first direction; B, thickness of the cover plate along the first direction; C, height of the cavity along the first direction; D, height of the extrusion part along the first direction The thickness in the first direction; E, the thickness of the deformation part along the first direction; F, the minimum thickness of the side wall of the cavity along the second direction; G, the maximum thickness of the side wall of the main body between the flange and the deformation part along the second direction; M, the maximum size of the injection hole along the second direction; N, the size of the gap between two adjacent protrusions 232; L, the minimum distance between the seal and the groove; a, the minimum wall thickness of the cavity; b, the maximum wall thickness of the cavity; c, the thickness of the extrusion part along the first direction; d, the thickness of the groove along the first direction; e, the size of the accommodating space along the second direction; f, the thickness of the groove along the second direction; g, the size of the flange along the second direction; m, the size of the flange along the first direction. DETAILED DESCRIPTION

[0024] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0025] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0026] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0027] To facilitate understanding of the battery provided in the embodiment of the present application, its application scenario is first explained. The battery provided in the embodiment of the present application is applied to products that use electric energy as energy and is used as a device for providing electric energy. In the prior art, the height of the plugging assembly fixed on the cover plate of the battery and the thickness of the cover plate of the battery are not designed reasonably; if the height of the plugging assembly is too high compared to the thickness of the cover plate, the plugging assembly is not firmly fixed on the cover plate, and then the sealing effect of the plugging assembly on the injection through hole is not good; if the thickness of the cover plate is too large, the space utilization rate is reduced. To this end, the embodiment of the present application provides a battery for the situation where the internal space utilization rate of the battery is low and the plugging assembly is not firmly riveted, resulting in poor sealing effect due to the unreasonable design of the height of the plugging assembly and the thickness of the cover plate of the battery. It is described in detail below in conjunction with specific drawings and embodiments.

[0028] For reference Figure 1 and Figure 2 , Figure 1 A top view of a cover plate in a battery provided in an embodiment of the present application is shown. Figure 2 A schematic diagram of the internal structure of a battery provided in an embodiment of the present application is shown.

[0029] The embodiment of the present application illustrates a battery. The battery includes a cover plate 1. The cover plate 1 is provided with an injection through hole 11. Among them, the function of the injection through hole 11 is to provide a channel for the injection needle to pass through the cover plate 1 to inject the electrolyte solution. It should be noted that the electrolyte solution in the embodiment of the present application specifically refers to the medium used in chemical batteries, electrolytic capacitors, etc., which provides ions for the normal operation of chemical batteries or electrolytic capacitors, and makes the chemical reactions occurring during the operation reversible. The electrolyte solution plays the role of conducting ions between the positive and negative electrodes of the battery, allowing the ions to migrate between the positive and negative electrodes to achieve reversible circulation.

[0030] The battery also includes a battery core 4. In the embodiment of the present application, the battery core 4 specifically refers to a single electrochemical component including a positive electrode and a negative electrode. The injection needle injects the electrolyte solution into the battery core 4 through the injection through hole 11.

[0031] Specifically, the battery cell 4 is arranged on one side of the cover plate 1 along the first direction. Figure 2 , it is shown that the first direction is the extending direction of the liquid injection through hole 11.

[0032] The battery also includes a plugging component 2. The function of the plugging component 2 is to effectively plug the injection through hole 11 into which the electrolyte solution is injected, so that the electrolyte solution is not easy to overflow to the side of the cover plate 1 away from the battery cell 4, thereby corroding other electronic components outside the battery, such as: corroding the pole, corroding the wiring harness collection structure, etc.

[0033] It should be noted that the pole in the embodiment of the present application specifically refers to a component whose one end is electrically connected to the pole ear of the battery cell 4 and the other end is electrically connected to the external conductor of the battery or one of the positive and negative electrodes of the adjacent battery cell 4 in the battery.

[0034] In the embodiment of the present application, the wiring harness collection structure specifically refers to a component used to collect information such as the temperature and voltage of the battery cell 4. For example: a flexible flat cable (Flexible Flat Cable), a flexible printed circuit (Flexible Printed Circuit), etc.

[0035] Specifically, the plugging component 2 is provided with a liquid injection through hole 11 , and two ends of the plugging component 2 along the first direction respectively abut against two sides of the cover plate 1 along the first direction, so that the plugging component 2 is fixed on the cover plate 1 and blocks the liquid injection through hole 11 .

[0036] Wherein, the length of the blocking component 2 along the first direction is assumed to be A;

[0037] Assume that the thickness of the cover plate 1 along the first direction is B;

[0038] Specifically, the ratio of A to B A / B ranges from 2≤A / B≤5. For example, the value of A / B is 2, the value of A / B is 2.3, the value of A / B is 2.5, the value of A / B is 2.8, the value of A / B is 3, the value of A / B is 3.2, the value of A / B is 3.5, the value of A / B is 3.8, the value of A / B is 4, the value of A / B is 4.2, the value of A / B is 4.5, the value of A / B is 4.8, the value of A / B is 5, etc. In the embodiment of the present application, the value of A / B is 2.8 as an example for explanation.

[0039] Among them, the value of A / B is within a reasonable range of values ​​(i.e., 2≤A / B≤5). If the value of A / B is small, it indicates that the length of the sealing component 2 along the first direction is relatively short. At this time, the thickness of the cover plate 1 along the first direction is relatively thick. For example: when the value of A / B is 2, when the thickness of the cover plate 1 along the first direction remains unchanged, the sealing component 2 has the shortest length along the first direction. It should be noted that the shortest length can satisfy the requirement that the two ends of the sealing component 2 along the first direction are respectively in contact with the two sides of the cover plate 1 along the first direction, and the sealing component 2 is fixed on the cover plate 1, and effectively blocks the injection through hole 11.

[0040] If the value of A / B is large, it indicates that the length of the sealing component 2 along the first direction is relatively long. At this time, the thickness of the cover plate 1 along the first direction is relatively thin. For example: when the value of A / B is 5, when the thickness of the cover plate 1 along the first direction remains unchanged, the sealing component 2 has the longest length along the first direction. It should be noted that this longest length can satisfy the structure formed by the deformation of the end of the sealing component 2 facing the battery cell 4, which abuts against the side of the cover plate 1 facing the battery cell 4, and together with the end of the sealing component 2 away from the battery cell 4, the sealing component 2 is fixed on the cover plate 1, and effectively blocks the injection hole 11.

[0041] However, if the value of A / B is less than 2, it indicates that the length of the plugging component 2 along the first direction is relatively short. At this time, the thickness of the cover plate 1 along the first direction is relatively thick. The two ends of the relatively short plugging component 2 are thinner, and the two ends squeeze the relatively thick cover plate 1. There is not enough binding force, and the plugging component 2 cannot be firmly fixed on the cover plate 1. With the use of the battery, the two thinner ends will be damaged, thereby reducing the firmness of the plugging component 2 fixed on the cover plate 1 and the plugging effect of the plugging component 2 on the injection through hole 11.

[0042] If the value of A / B is greater than 5, it indicates that the length of the plugging component 2 along the first direction is relatively long. At this time, the thickness of the cover plate 1 along the first direction is relatively thin. The relatively long plugging component 2 has a small deformation at the end facing the battery cell 4 during the process of fixing the plugging component 2 on the cover plate 1, and the extrusion force at the end pressed on the cover plate 1 is insufficient. Therefore, the plugging component 2 cannot be firmly fixed on the cover plate 1 with the end of the plugging component 2 away from the battery cell 4, thereby reducing the plugging effect of the plugging component 2 on the injection through hole 11.

[0043] By setting the value range of the ratio A / B of the length A of the plugging component 2 along the first direction and the thickness B of the cover plate 1 along the first direction to be 2≤A / B≤5, the length of the plugging component 2 along the first direction and the thickness of the cover plate 1 along the first direction can be controlled within a reasonable range, so that both ends of the plugging component 2 have sufficient binding force in the thickness direction to firmly fix the plugging component 2 on the cover plate 1. In addition, the deformation of the end of the plugging component 2 facing the battery cell 4 to form the end pressed on the cover plate 1 can firmly fix the plugging component 2 on the cover plate 1 together with the end of the plugging component 2 away from the battery cell 4.

[0044] In addition to the above-mentioned problems existing in the prior art, there are also the following technical problems:

[0045] 1. The distance that the core-pulling pin in the plugging assembly fixed on the cover of the battery in the prior art moves and the thickness of the structure left inside the sealing pin after the core-pulling pin breaks are not designed reasonably. If the distance that the core-pulling pin moves during the fixing process of the plugging assembly is too large, the side wall of the sealing pin will be stretched relatively thin due to the excessive tensile force applied by the movement of the core-pulling pin, resulting in low strength of the side wall of the sealing pin, and thus poor sealing effect; if the distance that the core-pulling pin moves during the fixing process of the plugging assembly is too small, the plugging assembly will not be firmly fixed on the cover, and thus the plugging assembly will have a poor sealing effect on the injection through hole.

[0046] refer to Figure 3 , Figure 3 A schematic structural diagram of a sealing nail in a battery provided in an embodiment of the present application is shown.

[0047] In the embodiment of the present application, the plugging assembly 2 includes a sealing nail 21. The sealing nail 21 penetrates the liquid injection through hole 11.

[0048] The sealing nail 21 includes a flange 211 and a deformation portion 212. Specifically, the flange 211 is arranged on the side of the cover plate 1 away from the battery cell 4, and the deformation portion 212 is arranged on the side of the cover plate 1 facing the battery cell 4, so that the sealing nail 21 is fixed on the cover plate 1 and blocks the injection hole 11.

[0049] refer to Figure 4 , Figure 4 A schematic structural diagram of a forming portion in a battery provided in an embodiment of the present application is shown.

[0050] The plugging assembly 2 further includes a forming portion 22 . The forming portion 22 is used to drive the side of the sealing nail 21 facing the battery core 4 to deform to form a deformed portion 212 .

[0051] Specifically, the forming portion 22 includes an extrusion portion 221 and an abutment portion 222 , wherein the extrusion portion 221 is disposed close to the battery core 4 , and the abutment portion 222 is disposed close to the flange 211 .

[0052] For reference Figure 5 and Figure 6 , Figure 5 A schematic diagram of the structure annotation of the extrusion part in the battery provided in the embodiment of the present application is shown, Figure 6 A schematic diagram of the structure of a battery before a sealing assembly is fixed on a cover plate is shown in an embodiment of the present application.

[0053] The sealing nail 21 is provided with a receiving space 23 for receiving the forming portion 22. Specifically, the receiving space 23 has a cavity 231 on one side close to the battery cell 4.

[0054] Before the plugging assembly 2 is fixed to the cover plate 1, it also includes a core-pulling nail 24. In the process of fixing the plugging assembly 2, the plugging assembly 2 is firstly provided with a liquid injection through hole 11. The core-pulling nail 24 is clamped by a rivet gun, and a force is applied to the flange 211 in a first direction toward the cover plate 1, for example, by supporting the flange 211 with the end of the rivet gun. Then, the rivet gun is started to apply a force in the first direction away from the battery cell 4 to the core-pulling nail 24, so that the core-pulling nail 24 is broken in the accommodation space 23 inside the sealing nail 21 and is pulled out from the accommodation space 23 inside the sealing nail 21.

[0055] As an optional solution, a convex rib is provided inside the accommodation space 23. The rivet gun applies a force to the core-pulling nail 24 in a first direction away from the battery cell 4, so that the core-pulling nail 24 moves in the first direction to the side away from the battery cell 4. Since the convex rib is provided inside the accommodation space 23, the passage through which the core-pulling nail 24 moves becomes narrower at the position of the convex rib. As the core-pulling nail 24 continues to move in the first direction to the side away from the battery cell 4, the core-pulling nail 24 is squeezed by the convex rib and stretched by the force in the first direction away from the battery cell 4, and breaks. It should be noted that the structure of the core-pulling nail 24 remaining inside the sealing nail 21 after the breakage is the forming portion 22 of the present application. Among them, the portion of the forming portion 22 close to the battery cell 4 is the extrusion portion 221 of the present application, and the portion of the forming portion 22 close to the flange 211 is the abutment portion 222 of the present application. The abutting portion 222 is a portion that is broken at the position of the convex rib when the core-pulling nail 24 moves along the first direction toward the side away from the battery core 4 . The broken abutting portion 222 abuts against the convex rib.

[0056] At the same time, since the forming portion 22 squeezes the side wall of the sealing pin 21 during the movement along the first direction close to the flange 211, the portion of the side wall of the sealing pin 21 that contacts the extrusion portion 221 is deformed into the deforming portion 212, and then the sealing assembly 2 is fixed on the cover plate 1 under the joint action of the flange 211 and the deforming portion 212.

[0057] In the embodiment of the present application, the height of the cavity 231 along the first direction is set to C, and the thickness of the extrusion portion 221 along the first direction is set to D.

[0058] Specifically, the ratio C / D of C to D has a value range of 0.8≤C / D≤1. For example, the value of C / D is 0.8, the value of C / D is 0.82, the value of C / D is 0.85, the value of C / D is 0.87, the value of C / D is 0.9, the value of C / D is 0.92, the value of C / D is 0.95, the value of C / D is 0.97, the value of C / D is 0.98, the value of C / D is 0.99, the value of C / D is 1, etc. In the embodiment of the present application, the value of C / D is 0.85 as an example for explanation.

[0059] Among them, the value of C / D is within a reasonable range of values ​​(i.e., 0.8≤C / D≤1). If the value of C / D is small, it indicates that the height of the cavity 231 along the first direction is relatively low. At this time, the distance that the molding portion 22 moves along the first direction toward the side close to the flange 211 is shorter. For example: when the value of C / D is 0.8, when the thickness of the extrusion portion 221 along the first direction remains unchanged, during the process of fixing the plugging component 2 on the cover plate 1, the core-pulling pin 24 in the plugging component 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the molding portion 22 moves a minimum distance along the first direction toward the side close to the flange 211 in the accommodating space 23. It should be noted that this minimum distance can satisfy the requirement that the part of the side wall of the sealing pin 21 in contact with the extrusion portion 221 is deformed into the deformation portion 212 due to the extrusion of the extrusion portion 221, and the deformation portion 212 and the flange 211 work together to fix the plugging component 2 on the cover plate 1, and effectively plug the injection through hole 11.

[0060] If the value of C / D is large, it indicates that the height of the cavity 231 along the first direction is relatively high. At this time, the distance that the molding part 22 moves along the first direction toward the side close to the flange 211 is longer. For example: when the value of C / D is 1, when the thickness of the extrusion part 221 along the first direction remains unchanged, during the process of fixing the sealing component 2 on the cover plate 1, the core-pulling pin 24 in the sealing component 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the molding part 22 moves the maximum distance along the first direction toward the side close to the flange 211 in the accommodating space 23. It should be noted that since the part of the side wall of the sealing pin 21 in contact with the extrusion part 221 is connected to the side wall of the cavity 231, the part of the side wall of the sealing pin 21 in contact with the extrusion part 221 is squeezed as the extrusion part 221 moves, and the side wall of the cavity 231 is stretched, and the thickness of the side wall of the cavity 231 becomes thinner. The maximum distance can ensure that the side wall of the cavity 231 has sufficient strength and sealing performance after being stretched and thinned, thereby effectively sealing the injection through hole 11.

[0061] However, if the value of C / D is less than 0.8, it indicates that the height of the cavity 231 along the first direction is relatively low. At this time, when the thickness of the extrusion portion 221 along the first direction remains unchanged, during the fixing process of the plugging component 2, the core-pulling pin 24 in the plugging component 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the distance that the molding portion 22 moves along the first direction toward the side close to the flange 211 in the accommodating space 23 is very short, so that the extrusion portion 221 in the molding portion 22 squeezes the side wall of the sealing pin 21 so that the deformation of the part of the side wall of the sealing pin 21 in contact with the extrusion portion 221 is very small, thereby reducing the fixing effect of the deformation portion 212 and the flange 211 to fix the plugging component 2 on the cover plate 1. At the same time, the plugging effect of the plugging component 2 on the injection through hole 11 is also reduced.

[0062] If the value of C / D is greater than 1, it indicates that the height of the cavity 231 along the first direction is relatively high. At this time, when the thickness of the extrusion part 221 along the first direction remains unchanged, during the fixing process of the plugging component 2, the core-pulling pin 24 in the plugging component 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the distance that the molding part 22 moves along the first direction toward the side close to the flange 211 in the accommodating space 23 is very long, so that as the part of the side wall of the sealing pin 21 in contact with the extrusion part 221 is squeezed by the movement of the extrusion part 221, the thickness of the side wall of the cavity 231 after being stretched is very thin. As a result, the strength and sealing of the side wall of the cavity 231 that has become very thin after being stretched are reduced, and even damage may occur due to excessive stretching force, which reduces the plugging effect of the injection through hole 11.

[0063] By setting the ratio C / D of the height C of the cavity 231 along the first direction to the thickness D of the extrusion portion 221 along the first direction to take a value range of 0.8≤C / D≤1, the distance that the core-pulling nail 24 in the sealing component 2 moves along the first direction toward the side away from the battery cell 4 and the thickness dimension of the extrusion portion 221 along the first direction in the molding portion 22 left inside the sealing nail 21 after the core-pulling nail 24 breaks can be designed and controlled within a reasonable range, thereby improving the problem that the molding portion 22 moves too far along the first direction toward the side close to the flange 211 in the accommodating space 23, so that the part of the side wall of the sealing nail 21 that contacts the extrusion portion 221 is squeezed as the extrusion portion 221 moves, and the thickness of the side wall of the cavity 231 after being stretched is very thin, and then the strength and sealing of the side wall of the cavity 231 after being stretched to be very thin are reduced, and even damage occurs due to excessive stretching force, thereby reducing the sealing effect of the injection through hole 11.

[0064] At the same time, the problem that the distance that the forming portion 22 moves in the first direction toward the side close to the flange 211 in the accommodation space 23 is too small, so that the extrusion portion 221 extrudes the side wall of the sealing nail 21, resulting in a smaller deformation of the portion of the side wall of the sealing nail 21 in contact with the extrusion portion 221, thereby reducing the fixing effect of the deformation portion 212 and the flange 211 on the plugging component 2 on the cover plate 1. The plugging effect of the plugging component 2 on the injection through hole 11 is also reduced.

[0065] In the embodiment of the present application, the thickness of the deformation portion 212 along the first direction is set to E.

[0066] Specifically, the ratio of C to E C / E has a value range of 1≤C / E≤3. For example, the value of C / E is 1, the value of C / E is 1.2, the value of C / E is 1.5, the value of C / E is 1.7, the value of C / E is 1.9, the value of C / E is 2, the value of C / E is 2.2, the value of C / E is 2.5, the value of C / E is 2.7, the value of C / E is 3, etc. In the embodiment of the present application, the value of C / E is 1.5 as an example for explanation.

[0067] Among them, the value of C / E is within a reasonable range (i.e., 1≤C / E≤3). If the value of C / E is small, it indicates that when the value of C is constant, the thickness of the deformation portion 212 along the first direction is relatively thick, that is, the extrusion of the side wall of the sealing nail 21 by the extrusion portion 221 causes the portion of the side wall of the sealing nail 21 in contact with the extrusion portion 221 to be deformed more; for example: when the value of C / E is 1, during the process of fixing the plugging component 2 to the cover plate 1, the core-pulling nail 24 in the plugging component 2 is pulled out from the inside of the sealing nail 21 along the first direction, and the molding portion 22 moves toward the side of the flange 211 along the first direction, so that the portion of the side wall of the sealing nail 21 in contact with the extrusion portion 221 is deformed to form the deformation portion 212. At this time, the deformation portion 212 has a maximum thickness dimension along the first direction. It should be noted that the maximum thickness dimension of the deformation portion 212 along the first direction can meet the requirement that the deformation will not cause damage to the portion of the side wall of the sealing pin 21 that contacts the extrusion portion 221 due to excessive deformation, thereby reducing the sealing effect of the sealing component 2 on the injection hole 11.

[0068] If the value of C / E is large, it means that when the value of C is constant, the thickness of the deformation part 212 along the first direction is relatively thin. That is to say, the extrusion of the side wall of the sealing nail 21 by the extrusion part 221 makes the deformation of the part of the side wall of the sealing nail 21 that contacts the extrusion part 221 smaller; for example: when the value of C / E is 3, in the process of fixing the plugging component 2 on the cover plate 1, the core-pulling nail 24 in the plugging component 2 is pulled out from the inside of the sealing nail 21 along the first direction, and the molding part 22 moves toward the side of the flange 211 along the first direction so that the part of the side wall of the sealing nail 21 that contacts the extrusion part 221 is deformed to form the deformation part 212. At this time, the deformation part 212 has a minimum thickness dimension along the first direction. It should be noted that the minimum thickness dimension of the deformation part 212 along the first direction can meet the requirement of working together with the flange 211 to fix the plugging component 2 on the cover plate 1 and effectively block the injection through hole 11.

[0069] However, if the value of C / E is less than 1, it indicates that when the value of C is constant, the thickness of the deformation part 212 along the first direction is relatively thick. At this time, during the fixing process of the plugging component 2, the core-pulling nail 24 in the plugging component 2 is pulled out from the inside of the sealing nail 21 along the first direction, and the distance that the molding part 22 moves along the first direction toward the side close to the flange 211 in the accommodating space 23 is very long, so that the extrusion part 221 in the molding part 22 squeezes the side wall of the sealing nail 21, causing the part of the side wall of the sealing nail 21 that contacts the extrusion part 221 to be greatly deformed, and then the part of the side wall of the sealing nail 21 that contacts the extrusion part 221 is damaged due to the excessive deformation, which reduces the plugging effect of the plugging component 2 on the injection through hole 11.

[0070] If the value of C / E is greater than 3, it indicates that when the value of C is constant, the thickness of the deformation portion 212 along the first direction is relatively thin. At this time, during the fixing process of the plugging component 2, the core-pulling pin 24 in the plugging component 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the distance that the forming portion 22 moves along the first direction toward the side close to the flange 211 in the accommodating space 23 is very short, so that the part of the side wall of the sealing pin 21 in contact with the extrusion portion 221 is deformed very little as the extrusion portion 221 moves. As a result, the deformation portion 212 formed by deformation cannot work together with the flange 211 to fix the plugging component 2 well on the cover plate 1, and reduces the plugging effect of the plugging component 2 on the injection through hole 11.

[0071] By setting the ratio C / E of the height C of the cavity 231 along the first direction to the thickness E of the deformation portion 212 along the first direction in the range of 1≤C / E≤3, the design of the height of the cavity 231 along the first direction and the thickness of the deformation portion 212 along the first direction can be controlled within a reasonable range, thereby improving the problem that the distance moved by the molding portion 22 in the accommodating space 23 along the first direction toward the side close to the flange 211 is too large, so that the extrusion portion 221 in the molding portion 22 squeezes the side wall of the sealing nail 21, causing a large deformation of the portion of the side wall of the sealing nail 21 that contacts the extrusion portion 221, and even the portion of the side wall of the sealing nail 21 that contacts the extrusion portion 221 is damaged due to the excessive deformation, thereby reducing the sealing effect of the sealing component 2 on the injection through hole 11.

[0072] At the same time, the problem is also improved that the distance that the molding portion 22 moves in the accommodating space 23 along the first direction toward the side close to the flange 211 is too small, so that the extrusion portion 221 in the molding portion 22 squeezes the side wall of the sealing nail 21, resulting in a smaller deformation of the portion of the side wall of the sealing nail 21 that contacts the extrusion portion 221, and thus the deformed portion 212 is smaller in size along the first direction, which reduces the fixing effect of the deformed portion 212 and the flange 211 on the cover plate 1, and also reduces the sealing effect of the sealing component 2 on the injection hole 11.

[0073] In the embodiment of the present application, the minimum thickness of the side wall of the cavity 231 along the second direction is set to F. Figure 2 It is shown in FIG. 1 that the second direction is parallel to the surface of the cover plate 1 facing the battery cell 4 .

[0074] The value range of the ratio C / F of C to F is 1.5≤C / F≤8. For example, the value of C / F is 1.5, the value of C / F is 2, the value of C / F is 2.5, the value of C / F is 3, the value of C / F is 3.5, the value of C / F is 3.6, the value of C / F is 4, the value of C / F is 4.5, the value of C / F is 5, the value of C / F is 5.5, the value of C / F is 6, the value of C / F is 6.5, the value of C / F is 7, the value of C / F is 7.5, the value of C / F is 8, etc. In the embodiment of the present application, the value of C / F is 3.6 as an example for explanation.

[0075] Among them, the value of C / F is within a reasonable range (i.e., 1.5≤C / F≤8). If the value of C / F is small, it indicates that the height of the cavity 231 along the first direction is relatively low, and the corresponding minimum thickness of the side wall of the cavity 231 along the second direction is relatively thick. At this time, the side wall of the accommodating space 23 has a relatively large resistance to the movement of the extrusion portion 221 along the first direction toward the side of the flange 211. And because the distance that the extrusion portion 221 moves along the first direction toward the side of the flange 211 is short, the thickness of the side wall of the cavity 231 that is not in contact with the extrusion portion 221 along the second direction is relatively thick after being stretched; for example: when the value of C / F is 1.5, the core-pulling nail 24 in the sealing component 2 is pulled out from the inside of the sealing nail 21 along the first direction, and the molding portion 22 moves the minimum distance along the first direction toward the side of the flange 211.

[0076] It should be noted that the minimum distance can satisfy the requirement that the core-pulling pin 24 moves along the first direction inside the sealing pin 21, and the core-pulling pin 24 can move to a suitable position to break. Among them, the suitable position specifically refers to the position where the core-pulling pin 24 moves along the first direction toward the side of the flange 211 inside the sealing pin 21 to the part of the side wall of the sealing pin 21 that contacts the extrusion part 221 and deforms into the deformation part 212, and the deformation part 212 and the flange 211 work together to fix the plugging assembly 2 on the cover plate 1, and effectively plug the injection through hole 11.

[0077] The portion of the accommodation space 23 in contact with the pressing portion 221 and the portion of the side wall of the sealing pin 21 in contact with the pressing portion 221 have the same structure.

[0078] If the value of C / F is large, it indicates that the height of the cavity 231 along the first direction is relatively high, and the corresponding minimum thickness of the side wall of the cavity 231 along the second direction is relatively thin. At this time, since the portion of the accommodating space 23 in contact with the extrusion portion 221 is subjected to a large extrusion force exerted by the extrusion portion 221 moving along the first direction toward the side of the flange 211, the thickness of the side wall of the cavity 231 that is not in contact with the extrusion portion 221 along the second direction is stretched and becomes relatively thin; for example: when the value of C / F is 8, the core-pulling nail 24 in the sealing component 2 is pulled out from the inside of the sealing nail 21 along the first direction, and the molding portion 22 moves the maximum distance along the first direction toward the side of the flange 211. It should be noted that the portion of the side wall of the sealing nail 21 in contact with the extrusion portion 221 is squeezed as the extrusion portion 221 moves, and the side wall of the cavity 231 connected to the deformation portion 212 is stretched and thinned. This maximum distance can ensure that the side wall of the cavity 231 has sufficient strength and sealing performance after being stretched and thinned, so that the sealing component 2 can effectively seal the injection through hole 11.

[0079] However, if the value of C / F is less than 1.5, it indicates that the height of the cavity 231 along the first direction is relatively low. At this time, during the fixing process of the plugging component 2 on the cover plate 1, the core-pulling pin 24 in the plugging component 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the distance that the molding part 22 moves along the first direction toward the side of the flange 211 is very short, so that the extrusion part 221 squeezes the part of the sealing pin 21 in contact with the extrusion part 221, so that the deformation of the part of the side wall of the sealing pin 21 in contact with the extrusion part 221 is small, thereby reducing the fixing effect of the deformation part 212 and the flange 211 on the plugging component 2 on the cover plate 1, and also reducing the plugging effect of the plugging component 2 on the injection through hole 11.

[0080] It also shows that the minimum thickness of the side wall of the corresponding cavity 231 along the second direction is relatively thick. At this time, during the fixing process of the plugging component 2 to the cover plate 1, the side wall of the accommodating space 23 has a relatively large resistance to the movement of the extrusion portion 221 along the first direction toward the flange 211, which is not conducive to the fixed connection between the plugging component 2 and the cover plate 1.

[0081] If the value of C / F is greater than 8, it indicates that the height of the cavity 231 along the first direction is relatively high. At this time, during the process of fixing the plugging assembly 2 to the cover plate 1, the core-pulling pin 24 in the plugging assembly 2 is pulled out from the inside of the sealing pin 21 along the first direction, and the distance that the molding portion 22 moves along the first direction toward the side of the flange 211 is very long, so that the extrusion portion 221 squeezes the contact portion of the sealing pin 21 with the extrusion portion 221, so that the side wall of the cavity 231 is stretched to a very thin thickness, and then the strength and sealing of the side wall of the cavity 231 after being stretched to be very thin are reduced, thereby reducing the plugging effect of the plugging assembly 2 on the injection through hole 11.

[0082] By setting the ratio C / F of the height C of the cavity 231 along the first direction to the minimum thickness F of the side wall of the cavity 231 along the second direction to take a value range of 1.5≤C / F≤8, the design of the height dimension of the cavity 231 along the first direction and the minimum thickness dimension of the side wall of the cavity 231 along the second direction can be controlled within a reasonable range, thereby improving the problem that the minimum thickness of the side wall of the cavity 231 along the second direction is stretched very thin due to the excessive distance that the molding portion 22 moves along the first direction toward the flange 211, so that the portion of the sealing pin 21 that contacts the extrusion portion 221 is squeezed by the extrusion portion 221 moving along the first direction toward the flange 211, thereby reducing the strength and sealing of the side wall of the cavity 231 after being stretched very thin.

[0083] At the same time, the problem that the side wall of the accommodating space 23 has relatively large resistance to the movement of the extrusion portion 221 along the first direction toward the flange 211 is not convenient for fixing the sealing component 2 to the cover plate 1 is also improved.

[0084] It also improves the problem that the distance that the forming part 22 moves along the first direction toward the flange 211 is too small, so that the extrusion part 221 squeezes the part of the sealing pin 21 in contact with the extrusion part 221, so that the deformation of the part in contact with the extrusion part 221 is small, and the size of the deformed part 212 formed along the first direction is small, and the strength of the deformation part 212 and the flange 211 to fix the plugging component 2 on the cover plate 1 is low. It also reduces the plugging effect of the fixed plugging component 2 on the injection through hole 11.

[0085] Second, the prior art adopts the method of welding the plugging component to the liquid injection through hole to improve the sealing performance of the plugging component to the liquid injection through hole. However, the welding method is time-consuming and reduces the production efficiency of the battery.

[0086] In the embodiment of the present application, a protrusion 232 is provided on the inner wall of the accommodation space 23, and the protrusion 232 extends from the inner wall of the accommodation space 23 to the inside of the accommodation space 23. It should be noted that the protrusion 232 and the above-mentioned ribs have the same structure. Among them, the protrusion 232 extends from the inner wall of the accommodation space 23 to the inside of the accommodation space 23 in the embodiment of the present application specifically means that the protrusion 232 protrudes from the inner wall of the accommodation space 23 to the inside of the accommodation space 23, thereby forming a reduced diameter opening with a relatively small inner diameter. The protrusion 232 and the inner wall of the accommodation space 23 close to the battery cell side enclose a cavity 231.

[0087] Specifically, the abutting portion 222 is disposed in the cavity 231 and abuts against the protruding portion 232 to block the reduced diameter opening.

[0088] The raised portion 232 has a first surface 2321 close to the battery cell 4, and the first surface 2321 abuts against the abutting portion 222. The specific structure of the first surface 2321 is not limited in the embodiment of the present application, and the structure is that the side of the first surface 2321 close to the inner wall of the accommodation space 23 is closer to the battery cell 4 than the side of the first surface 2321 away from the inner wall of the accommodation space 23, such as a slope surface, an inclined curved surface, etc. In the embodiment of the present application, the first surface 2321 is taken as an example of a slope surface for description.

[0089] Since the first surface 2321 is a sloped surface or an inclined curved surface, that is, the first surface 2321 is inclined, the area of ​​the contact surface between the first surface 2321 and the abutting portion 222 is relatively large, so that when the electrolyte solution overflows from the side of the inner wall of the cavity 231 at the position of the protrusion 232 facing the battery cell 4 to the side of the inner wall of the cavity 231 at the position of the protrusion 232 facing the flange 211, the overflow path between the first surface 2321 and the abutting portion 222 is relatively long, and even if a small amount of electrolyte solution enters the cavity 231 from the battery cell 4, the small amount of electrolyte solution is not easy to overflow from the contact surface between the first surface 2321 and the abutting portion 222. It should be understood that even if the electrolyte solution overflows from the contact surface between the first surface 2321 and the abutting portion 222, the amount of the electrolyte solution is very small and should be within the range allowed by the error.

[0090] The raised portion 232 has a second surface 2322 away from the battery cell 4. The specific structure of the second surface 2322 is not limited in the embodiment of the present application, and the side of the second surface 2322 close to the inner wall of the cavity 231 is farther away from the battery cell 3 than the side of the second surface 2322 away from the inner wall of the cavity 231, such as a slope surface, an inclined curved surface, etc. In the embodiment of the present application, the second surface 2322 is an example of a slope surface for description.

[0091] Since the second surface 2322 is a sloped surface or an inclined curved surface, that is, the second surface 2322 is inclined, the electrolyte solution overflows from the side of the inner wall of the cavity 231 at the position of the protrusion 232 facing the battery cell 4 to the side of the inner wall of the cavity 231 at the position of the protrusion 232 facing the flange 211. At the same time, the side of the second surface 2322 close to the inner wall of the cavity 231 is farther away from the battery cell 4 than the side of the second surface 2322 away from the inner wall of the cavity 231, so that the cross section of the protrusion 232 is approximately triangular. The triangular shape enhances the stability of the protrusion 232 and improves the situation in which the protrusion 232 is damaged due to the extrusion force applied by the extrusion portion 221 and the abutment portion 222 toward the side of the flange 211 along the first direction during the fixing process of the plugging assembly 2.

[0092] As an optional solution, the raised portion 232 in the embodiment of the present application is an annular structure. The raised portion 232 is arranged circumferentially around the inner wall of the cavity 231. By setting the raised portion 232 as an annular structure, and the raised portion 232 is arranged circumferentially around the inner wall of the cavity 231, when the protrusion 232 is fixed to the sealing component 2, when the extrusion portion 221 and the abutment portion 222 move along the first direction toward the side of the flange 211 and apply an extrusion force to the raised portion 232, the raised portion 232 of the annular structure abuts against the abutment portion 222. The contact area is larger, and then the first surface 2321 and the abutment portion 222 are more closely fitted, thereby improving the sealing effect of the abutment portion 222 on the position of the raised portion 232 in the inner wall of the cavity 231.

[0093] As another optional solution, there are multiple protrusions 232. In the embodiment of the present application, multiple protrusions 232 specifically refer to two or more protrusions 232, such as: two protrusions 232, three protrusions 232, four protrusions 232, five protrusions 232, six protrusions 232, seven protrusions 232, eight protrusions 232, nine protrusions 232, ten protrusions 232, eleven protrusions 232, fifteen protrusions 232, sixteen protrusions 232, eighteen protrusions 232, etc. In the embodiment of the present application, eighteen protrusions 232 are used as an example for description.

[0094] Specifically, the plurality of protrusions 232 are arranged at intervals along the inner wall of the cavity 231 in the circumferential direction.

[0095] The size of the gap between two adjacent protrusions 232 is N, and the value range of N is 0.3mm≤N≤1.5mm. By setting the value range of the gap N between two adjacent protrusions 232 to 0.3mm≤N≤1.5mm, the gap between two adjacent protrusions 232 will not be too large, so that the effect of preventing the electrolyte solution from overflowing at the position of the protrusion 232 in the inner wall of the cavity 231 is reduced. At the same time, the gap between two adjacent protrusions 232 will not be too small, so that the core-pulling nail will break prematurely during the process of fixing the plugging component 2 on the cover plate 1. The extrusion of the sealing nail 21 by the extrusion part 221 on the contact part of the sealing nail 21 and the extrusion part 221 makes the deformation of the contact part of the sealing nail 21 and the extrusion part 221 smaller, and the size of the deformation part 212 formed along the first direction is smaller, and the strength of the deformation part 212 and the flange 211 to fix the plugging component 2 on the cover plate 1 is low. It also reduces the plugging effect of the fixed plugging component 2 on the injection through hole 11.

[0096] 3. In the prior art, when adjacent batteries thermally run away, the ejected electrolyte solution with a higher temperature splashes into the cavity formed inside the plugging component after riveting, which will corrode the inner wall of the plugging component, thereby causing the electrolyte solution to volatilize and even thermal runaway of the battery. Among them, riveting in the embodiment of the present application specifically refers to a method of connecting multiple parts by using axial force to upset the nail rod in the rivet hole of the part and form a nail head. Riveting is also called rivet connection. It should be noted that upsetting in the embodiment of the present application specifically refers to a forging process that reduces the height of the blank and increases the cross-section.

[0097] The battery in the embodiment of the present application further includes a sealing plate 25. The function of the sealing plate 25 is to cover the position where the plugging component 2 is provided on the cover plate 1, so as to prevent foreign matter from falling on the plugging component 2 and corroding the plugging component 2, thereby causing the electrolyte solution to volatilize from the plugging component 2 or even thermal runaway of the battery. It should be noted that foreign matter includes but is not limited to high-heat electrolyte solution and high-temperature debris ejected from adjacent batteries.

[0098] Specifically, the sealing plate 25 is arranged on the side of the cover plate 1 close to the flange 211 along the first direction, and the sealing plate 25 at least covers the blocking component 2. Among them, the sealing plate 25 at least covers the blocking component 2 in the embodiment of the present application specifically means that the sealing plate 25 is arranged on the cover plate 1 and the sealing plate 25 only covers the blocking component 2, the sealing plate 25 is arranged on the cover plate 1 and the sealing plate 25 covers the blocking component 2 and extends beyond the blocking component 2 along the second direction, and the sealing plate 25 completely covers the side of the cover plate 1 close to the flange 211 along the first direction. In the embodiment of the present application, the sealing plate 25 is arranged on the cover plate 1, and the sealing plate 25 covers the blocking component 2 and extends beyond the blocking component 2 along the second direction as an example for explanation. Among them, Figure 2 It is shown that the second direction is perpendicular to the first direction.

[0099] By arranging a sealing plate 25 on one side of the cover plate 1 close to the flange 211 along the first direction, the situation in which the sealing component 2 is corroded due to foreign matter falling on the sealing component 2, and then the electrolyte solution evaporates from the sealing component 2 or even the battery thermal runaway occurs is improved, and the sealing effect of the injection hole 11 is further improved.

[0100] Fourth, the thickness of the side wall of the sealing pin inside the battery in the prior art is not designed reasonably. If the thickness of the side wall of the sealing pin is too small, the side wall of the sealing pin located between the flange and the deformation part is prone to significant deformation during the process of fixing the sealing pin on the cover plate, which may lead to sealing failure; if the thickness of the side wall of the sealing pin is too large, the process of pulling out the core pin inside the sealing pin from the inside of the sealing pin is relatively laborious, and even the distance that the core pin moves inside the sealing pin is relatively short, and the size of the deformation part formed is relatively small, which reduces the fixing effect of the sealing pin on the cover plate, thereby leading to sealing failure.

[0101] refer to Figure 7, Figure 7 A schematic diagram of the structure annotation of a sealing nail in a battery provided in an embodiment of the present application is shown.

[0102] In the embodiment of the present application, the sealing nail 21 further includes a main body 213 .

[0103] Specifically, the main body 213 is provided with a liquid injection through hole 11. The main body 213 is provided with a receiving space 23 inside.

[0104] In the embodiment of the present application, the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation portion 212 along the second direction is G. Figure 2 It is shown that the second direction is perpendicular to the first direction.

[0105] Specifically, the value range of G is 0.3mm≤G≤1.5mm. Exemplarily, the value of G is 0.3mm, the value of G is 0.4mm, the value of G is 0.5mm, the value of G is 0.58mm, the value of G is 0.6mm, the value of G is 0.7mm, the value of G is 0.8mm, the value of G is 0.9mm, the value of G is 1mm, the value of G is 1.1mm, the value of G is 1.2mm, the value of G is 1.3mm, the value of G is 1.4mm, the value of G is 1.5mm, etc. In the embodiment of the present application, the value of G is 0.58mm as an example for explanation.

[0106] Among them, the value of G is within a reasonable range (i.e., 0.3mm≤G≤1.5mm). If the value of G is small, it indicates that the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is thinner. At this time, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thinner; for example: when the value of G is 0.3mm, the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is thinner. Because during the fixing process of the sealing nail 21, when a rivet gun or other tools used to rivet the sealing nail 21 is used to apply a force along the first direction toward the cover plate 1 to the flange 211, the side wall of the main body 213 located between the flange 211 and the cover plate 1 is also subjected to the force along the first direction toward the cover plate 1. It should be noted that the thinner maximum thickness can ensure that the side wall of the main body 213 located between the flange 211 and the cover plate 1 does not deform. Even if the side wall of the main body 213 located between the flange 211 and the cover plate 1 is deformed, the degree of deformation is within the allowable range, and the sealing failure will not occur due to excessive deformation of the side wall of the main body 213 located between the flange 211 and the cover plate 1.

[0107] If the value of G is large, it indicates that the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is thicker. At this time, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thicker; for example: when the value of G is 1.5mm, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thicker. It should be noted that, when the size of the injection through hole 11 along the second direction and the size of the core-pulling pin 24 along the second direction are constant, the thicker maximum thickness can meet the process of the core-pulling pin 24 being pulled out of the sealing pin 21 along the first direction from the inside of the sealing pin 21. The friction force exerted by the inner side wall of the main body 213 on the outer side wall of the core-pulling pin 24 is not very large, and will not produce a large resistance to the pulling out of the core-pulling pin 24 from the inside of the sealing pin 21, so that the process of fixing the plugging component 2 on the cover plate 1 is more laborious.

[0108] However, if the value of G is less than 0.3 mm, it indicates that the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation portion 212 along the second direction is very thin. At this time, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is very thin, so that when the plugging assembly 2 is fixed to the cover plate 1, a rivet gun or other tool for riveting the plugging assembly 2 is used to apply a force along the first direction toward the cover plate 1 to the flange 211. Since the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is very thin, and the side wall of the main body 213 between the flange 211 and the cover plate 1 is also subjected to a force along the first direction toward the cover plate 1, the deformation degree of the side wall of the main body 213 between the flange 211 and the cover plate 1 is relatively large. After the plugging component 2 is fixedly connected to the cover plate 1, the deformation of the side wall of the main body 213 between the flange 211 and the cover plate 1 is large, thereby reducing the sealing effect of the plugging component 2 on the injection through hole 11. After the plugging component 2 is fixedly connected to the cover plate 1, the deformation of the side wall of the main body 213 between the flange 211 and the cover plate 1 is too large and may even be damaged, thereby failing to seal the plugging component 2 on the injection through hole 11.

[0109] If the value of G is greater than 1.5 mm, it indicates that the maximum thickness of the side wall of the main body 213 between the flange 211 and the deformed portion 212 along the second direction is very thick. When the size of the injection through hole 11 along the second direction and the size of the core-pulling pin 24 along the second direction are constant, since the maximum thickness of the side wall of the main body 213 between the flange 211 and the deformed portion 212 along the second direction is very thick, the friction force exerted by the inner side wall of the main body 213 on the outer side wall of the core-pulling pin 24 is very large, so that a large resistance is generated to the core-pulling pin 24 being pulled out from the inside of the sealing pin 21, making the process of fixing the sealing pin 21 on the cover plate 1 more laborious.

[0110] By setting the value range of the maximum thickness G of the side wall of the main body 213 between the connecting flange 211 and the deformable portion 212 along the second direction to 0.3mm≤G≤1.5mm, the maximum thickness dimension of the side wall of the main body 213 between the connecting flange 211 and the deformable portion 212 along the second direction can be controlled within a reasonable range, thereby limiting the maximum thickness dimension of the side wall of the main body 213 between the connecting flange 211 and the deformable portion 212 along the second direction, thereby improving the maximum thickness dimension of the side wall of the main body 213 between the connecting flange 211 and the deformable portion 212 along the second direction. The thickness dimension is too small, so that when the sealing component 2 is fixed to the cover plate 1, when a force is applied to the flange 211 along the first direction toward the cover plate 1 using a rivet gun or other tools for riveting the sealing component 2, the side wall of the main body 213 located between the flange 211 and the cover plate 1 is also subjected to the force along the first direction toward the cover plate 1, and the side wall of the main body 213 located between the flange 211 and the cover plate 1 is deformed to a large extent, resulting in damage to the sealing component 2 after being fixedly connected to the cover plate 1 due to the large deformation of the side wall of the main body 213 located between the flange 211 and the cover plate 1, and then the sealing fails.

[0111] At the same time, the problem is also improved that the maximum thickness dimension of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is too large, so that the friction force exerted by the inner side wall of the main body 213 on the outer side wall of the core-pulling nail 24 is very large, so that a large resistance is generated to the withdrawal of the core-pulling nail 24 from the inside of the sealing nail 21, making the process of fixing the sealing assembly 2 on the cover plate 1 more laborious.

[0112] In the embodiment of the present application, it is assumed that the maximum dimension of the liquid injection hole 11 along the second direction is M.

[0113] Specifically, the ratio of G to M G / M ranges from 0.1≤G / M≤0.5. For example, the value of G / M is 0.1, the value of G / M is 0.15, the value of G / M is 0.2, the value of G / M is 0.25, the value of G / M is 0.28, the value of G / M is 0.3, the value of G / M is 0.35, the value of G / M is 0.4, the value of G / M is 0.45, the value of G / M is 0.5, etc. In the embodiment of the present application, the value of G / M is 0.28 as an example for explanation.

[0114] Among them, the value of G / M is within a reasonable range (i.e., 0.1≤G / M≤0.5). If the value of G / M is small, it indicates that when the maximum size of the injection hole 11 along the second direction is selected, the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is thinner. At this time, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thinner; for example: when the value of G / M is 0.1, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thinner. It should be noted that, when the plugging assembly 2 is fixed to the cover plate 1, a rivet gun or other tool for riveting the plugging assembly 2 is used to apply a force along the first direction toward the cover plate 1 to the flange 211, and the side wall of the main body 213 located between the flange 211 and the cover plate 1 is also subjected to a force along the first direction toward the cover plate 1. The thinner maximum thickness can ensure that the side wall of the main body 213 located between the flange 211 and the cover plate 1 does not deform. Even if the side wall of the main body 213 located between the flange 211 and the cover plate 1 deforms, it is within the allowable range, and the side wall of the main body 213 located between the flange 211 and the cover plate 1 will not deform to a large extent, thereby reducing the sealing effect of the plugging assembly 2 on the injection through hole 11. The plugging assembly 2 fixedly connected to the cover plate 1 may even be damaged due to the excessive deformation of the side wall of the main body 213 located between the flange 211 and the cover plate 1, and the sealing of the plugging assembly 2 on the injection through hole 11 fails.

[0115] If the value of G / M is large, it indicates that when the maximum size of the injection hole 11 along the second direction is selected, the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is thicker. At this time, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thicker; for example: when the value of G / M is 0.5, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is thicker. It should be noted that, when the size of the injection hole 11 along the second direction and the size of the core-pulling nail 24 along the second direction are constant, the thicker maximum thickness can meet the requirement that the friction force exerted by the inner side wall of the main body 213 on the outer side wall of the core-pulling nail 24 is not very large during the process of the core-pulling nail 24 being pulled out from the sealing nail 21 along the first direction inside the sealing nail 21, and will not generate a large resistance to the core-pulling nail 24 being pulled out from the inside of the sealing nail 21, so that the process of fixing the plugging component 2 on the cover plate 1 is more laborious.

[0116] However, if the value of G / M is less than 0.1, it indicates that the maximum thickness of the side wall of the main body 213 connecting the flange 211 and the deformed portion 212 along the second direction is very thin. At this time, the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is very thin, so that when the plugging component 2 is fixed to the cover plate 1, a rivet gun or other tool for riveting the plugging component 2 is used to apply a force in the first direction toward the cover plate 1 to the flange 211. Since the maximum thickness of the side wall of the main body 213 between the flange 211 and the cover plate 1 along the second direction is very thin, and the side wall of the main body 213 between the flange 211 and the cover plate 1 is also subjected to a force in the first direction toward the cover plate 1. Due to the force toward the cover plate 1, the side wall of the main body 213 located between the flange 211 and the cover plate 1 is deformed to a large extent, resulting in the sealing effect of the sealing component 2 for the injection hole 11 being reduced due to the large deformation of the side wall of the main body 213 located between the flange 211 and the cover plate 1 after being fixedly connected to the cover plate 1. The side wall of the main body 213 located between the flange 211 and the cover plate 1 is even damaged due to excessive deformation, resulting in failure of the sealing component 2 for the injection hole 11.

[0117] If the value of G / M is greater than 0.5, it indicates that the maximum thickness of the side wall of the main body 213 between the connecting flange 211 and the deforming portion 212 along the second direction is very thick. When the size of the injection through hole 11 along the second direction and the size of the core-pulling pin 24 along the second direction are constant, since the maximum thickness of the side wall of the main body 213 between the connecting flange 211 and the deforming portion 212 along the second direction is very thick, the friction force exerted by the inner side wall of the main body 213 on the outer side wall of the core-pulling pin 24 is very large, so that the resistance to the core-pulling pin 24 being pulled out from the inside of the sealing pin 21 is relatively large, making the process of fixing the plugging assembly 2 on the cover plate 1 more laborious.

[0118] By setting the value range of the ratio G / M of the maximum thickness G of the side wall of the main body 213 between the connecting flange 211 and the deformable part 212 along the second direction to the maximum dimension M of the injection through hole 11 along the second direction to be 0.1≤G / M≤0.5, the ratio of the maximum thickness dimension G of the side wall of the main body 213 between the connecting flange 211 and the deformable part 212 along the second direction to the maximum dimension M of the injection through hole 11 along the second direction can be controlled within a reasonable range, thereby limiting the maximum thickness dimension of the side wall of the main body 213 between the connecting flange 211 and the deformable part 212 along the second direction, improving the problem that the maximum thickness dimension of the side wall of the main body 213 between the connecting flange 211 and the deformable part 212 along the second direction is too small, so that the sealing During the process of fixing the component 2 on the cover plate 1, when a rivet gun or other tools used to rivet the sealing component 2 are used to apply a force along the first direction toward the cover plate 1 to the flange 211, the side wall of the main body 213 located between the flange 211 and the cover plate 1 is also subjected to the force along the first direction toward the cover plate 1. The side wall of the main body 213 located between the flange 211 and the cover plate 1 is deformed to a large extent, resulting in the sealing effect of the sealing component 2 on the injection hole 11 after being fixedly connected to the cover plate 1 being reduced due to the large deformation of the side wall of the main body 213 located between the flange 211 and the cover plate 1. The side wall of the main body 213 located between the flange 211 and the cover plate 1 is even damaged due to the excessive deformation, resulting in failure of the sealing component 2 to seal the injection hole 11.

[0119] At the same time, the problem is also improved that the maximum thickness dimension of the side wall of the main body 213 connecting the flange 211 and the deformation part 212 along the second direction is too large, so that the friction force exerted by the inner side wall of the main body 213 on the outer side wall of the core-pulling nail 24 is very large, so that the resistance to the core-pulling nail 24 being pulled out from the inside of the sealing nail 21 is relatively large, making the process of fixing the sealing assembly 2 on the cover plate 1 more laborious.

[0120] 5. In the prior art, there is a risk of leakage and short circuit between the cover plate and the battery cell of the battery with riveted sealing nails.

[0121] refer to Figure 8 , Figure 8 A schematic structural diagram of an insulating component in a battery provided in an embodiment of the present application is shown.

[0122] The battery in the embodiment of the present application also includes an insulating member 6. Among them, the insulating member 6 is used to insulate between the cover plate 1 and other components inside the battery. Exemplarily, the insulating member 6 serves as an insulator between the cover plate 1 and the battery cell 4. The specific material type of the insulating member 6 is not limited in the embodiment of the present application, and it can be a material with good insulation performance, high temperature resistance and corrosion resistance. For example: polypropylene, polyvinyl chloride, polyimide, polyamide, epoxy resin, etc. In the embodiment of the present application, the specific material type of the insulating member 6 is epoxy resin as an example for illustration.

[0123] Specifically, the insulating member 6 is disposed on a side of the cover plate 1 close to the battery cell 4 , and the insulating member 6 is located between the battery cell 4 and the cover plate 1 .

[0124] The insulating member 6 is provided with an avoidance hole 61. The blocking component 2 can be provided with the avoidance hole 61. By providing the avoidance hole 61, the insulating member 6 can both play an insulating role between the cover plate 1 and the battery cell 4 and will not interfere with the blocking component 2.

[0125] 6. The sealing effect of the sealing component in the prior art on the liquid injection through hole is insufficient.

[0126] refer to Fig. 9 , Fig. 9 A schematic diagram of the structure annotation of the side wall of the hollow cavity in the battery provided in an embodiment of the present application is shown.

[0127] In the embodiment of the present application, the minimum wall thickness of the cavity 231 is set to a. It should be noted that the wall thickness of the cavity 231 includes the thickness of the end of the cavity 231 facing the battery cell 4 and the thickness of the side wall of the cavity 231 extending along the first direction.

[0128] In the embodiment of the present application, the thickness of the side wall of the cavity 231 is less than the thickness of the end of the cavity 231 facing the battery cell 4, so the thickness of the side wall of the cavity 231 is the minimum wall thickness a of the cavity 231. It should be noted that after the plugging assembly 2 is fixed to the cover plate 1 by riveting, the thickness of the side wall of some areas of the cavity 231 is inconsistent with that of other areas. The minimum wall thickness a of the cavity 231 only represents the minimum thickness of all areas of the cavity 231.

[0129] Specifically, the value range of a is 0.15mm≤a≤0.5mm. For example, the value of a is 0.15mm, the value of a is 0.17mm, the value of a is 0.18mm, the value of a is 0.23mm, the value of a is 0.25mm, the value of a is 0.28mm, the value of a is 0.3mm, the value of a is 0.32mm, the value of a is 0.35mm, the value of a is 0.38mm, the value of a is 0.4mm, the value of a is 0.42mm, the value of a is 0.45mm, the value of a is 0.48mm, the value of a is 0.5mm, etc. In the embodiment of the present application, the value of a is 0.38mm as an example for explanation.

[0130] Since the position of the minimum wall thickness of the cavity 231 is also the position with the lowest strength in the side wall of the cavity 231, when the minimum wall thickness of the cavity 231 is less than 0.15 mm, cracks may exist at the weakest position of the cavity 231 under the action of external pressure or internal stress of the sealing pin 21, thereby causing the risk of failure. When the cover plate 1 is used as a part of the battery shell, the inner cavity of the battery shell is connected to the outside world, and the electrolyte solution may leak or external impurities may enter the battery shell, affecting the normal use of the battery.

[0131] When the minimum wall thickness of the cavity 231 is greater than 0.5 mm, since the deformation portion 212 is formed by the side wall deformation of the sealing pin 21 squeezed by the extrusion portion 221, the minimum wall thickness of the cavity 231 is too large, and the sealing pin 21 is not easy to deform or the deformation is small. The flange 211 and the deformation portion 212 formed by the small deformation cannot firmly fix the sealing assembly 2 on the cover plate 1.

[0132] By setting the minimum wall thickness a of the cavity 231 to a value range of 0.15 mm ≤ a ≤ 0.5 mm, the sealing effect of the side wall of the cavity 231 can be maintained, so that the battery can be used normally, and the fixed connection between the sealing component 2 and the cover plate 1 can be facilitated.

[0133] In the embodiment of the present application, the maximum wall thickness of the cavity 231 is set to b. It should be noted that after the plugging assembly 2 is fixed to the cover plate 1 by riveting, the thickness of the side wall of some areas of the cavity 231 is inconsistent with that of other areas. The maximum wall thickness b of the cavity 231 only represents the maximum thickness among the thicknesses of all areas of the cavity 231.

[0134] Specifically, the ratio of a to b, a / b, has a value range of 0.3≤a / b≤0.7. For example, the value of a / b is 0.3, the value of a / b is 0.32, the value of a / b is 0.35, the value of a / b is 0.38, the value of a / b is 0.4, the value of a / b is 0.43, the value of a / b is 0.45, the value of a / b is 0.48, the value of a / b is 0.5, the value of a / b is 0.52, the value of a / b is 0.55, the value of a / b is 0.58, the value of a / b is 0.6, the value of a / b is 0.63, the value of a / b is 0.65, the value of a / b is 0.68, the value of a / b is 0.7, etc. In the embodiment of the present application, the value of a / b of 0.58 is taken as an example for explanation.

[0135] When the ratio of the minimum wall thickness of the cavity 231 to the maximum wall thickness of the cavity 231 is less than 0.3 or greater than 0.7, the difference between the minimum wall thickness of the cavity 231 and the maximum wall thickness of the cavity 231 is too large, the strength difference between different positions of the side wall of the cavity 231 is too large, and the strength of the side wall of the cavity 231 is uneven, which easily causes cracks or fractures at the position of the minimum wall thickness of the cavity 231. The ratio of the minimum wall thickness of the cavity 231 to the maximum wall thickness of the cavity 231 is set within a suitable range to keep the forces on different areas of the side wall of the cavity 231 relatively balanced and to keep the structure of the side wall of the cavity 231 stable.

[0136] In the embodiment of the present application, the thickness of the extrusion portion 221 along the first direction is set to c;

[0137] Specifically, the ratio of a to c, a / c, has a value range of 0.15≤a / c≤0.65. For example, the value of a / c is 0.15, the value of a / c is 0.18, the value of a / c is 0.2, the value of a / c is 0.23, the value of a / c is 0.25, the value of a / c is 0.28, the value of a / c is 0.3, the value of a / c is 0.32, the value of a / c is 0.35, the value of a / c is 0.38, the value of a / c is 0.4, the value of a / c is 0.42, the value of a / c is 0.45, the value of a / c is 0.48, the value of a / c is 0.5, the value of a / c is 0.52, the value of a / c is 0.55, the value of a / c is 0.58, the value of a / c is 0.6, the value of a / c is 0.63, the value of a / c is 0.65, and the like. In the embodiment of the present application, the value of a / c is 0.18 as an example for illustration.

[0138] Since the extrusion part 221 applies a force toward the cover plate 1 to the main body 213, the ratio of the minimum wall thickness a of the cavity 231 to the thickness c of the extrusion part 221 along the first direction is too large, which will cause the minimum wall thickness a of the cavity 231 to be too large or the thickness c of the extrusion part 221 along the first direction to be too large. If the minimum wall thickness a of the cavity 231 is too large, a large pulling force needs to be applied to the main body 213 to achieve the deformation of the main body 213; if the thickness c of the extrusion part 221 along the first direction is too large, the minimum wall thickness of the cavity 231 is relatively thin, and the extrusion part 221 applies a large force to the main body 213, which may cause the main body 213 to break.

[0139] By setting the ratio a / c of ​​the minimum wall thickness a of the cavity 231 to the thickness c of the extrusion portion 221 along the first direction to be in the range of 0.15≤a / c≤0.65, the fixed connection between the blocking component 2 and the cover plate 1 is facilitated, and the structural strength of the main body 213 itself is maintained.

[0140] 7. In the prior art, after the plugging assembly is fixedly connected to the cover plate using a rivet gun, the end surface of the plugging assembly may be uneven.

[0141] refer to Fig.10 , Fig.10 A schematic diagram of the structure annotation of a groove in a battery provided in an embodiment of the present application is shown.

[0142] In the embodiment of the present application, the sealing pin 21 further includes a groove 12 .

[0143] Specifically, the groove 12 is disposed at an end of the sealing nail 21 away from the battery cell 4 , the groove 12 is located at an edge of the accommodating space 23 , and the groove 12 is communicated with the accommodating space 23 .

[0144] The groove 12 is a circular ring groove, the inner diameter of the groove 12 is equal to the diameter of the accommodating space 23, and the outer diameter of the groove 12 is smaller than the diameter of the flange 211. Exemplarily, the cross section of the groove 12 is a square, and optionally, the cross section of the groove 12 is a quarter circle, a right trapezoid or a right triangle.

[0145] When a rivet gun is used to apply a pulling force to the core pull 4, there is a deviation between the direction of the actual force and the first direction of the theoretical force, so that there is an angle between the direction of the actual force and the first direction. The core pull 4 has a certain component force along the radial direction of the injection hole 11. This component force will cause the end of the sealing nail 21 provided with the flange 211 to undergo plastic deformation near the accommodating space 23, causing a bulge or burr to appear on the end face of the sealing nail 21 provided with the flange 211.

[0146] When a battery with a protrusion or burr is used as one end of a battery, the protrusion or burr may affect the insulating component or busbar on the battery. It should be noted that the insulating component in the embodiment of the present application specifically refers to an insulating plate covering the battery, and the insulating component has a avoidance hole for avoiding the pole on the battery. The busbar is a conductive part that is conductively connected to the pole on the battery.

[0147] By setting a groove 12 at the end of the sealing pin 21 away from the battery cell 4, the force applied by the core-pulling pin 24 to the sealing pin 21 has a component force along the second direction, so that the position where the sealing pin 21 produces a protrusion or burr is located on the bottom wall of the groove 12, so that the end surface of the sealing pin 21 with the flange 211 remains flat.

[0148] As an optional solution, the groove 12 is arranged around the outer circumference of the liquid injection through hole 11 , and the groove 12 is communicated with the accommodating space 23 .

[0149] Specifically, the groove 12 is an annular groove sleeved on the outside of the accommodating space 23 , and the groove 12 is communicated with the accommodating space 23 .

[0150] Furthermore, the inner side surface of the groove 12 completely overlaps with the inner side surface of the accommodating space 23 .

[0151] As an optional solution, the groove 12 is a circular ring-shaped groove arranged around the outer circumference of the liquid injection through hole 11 .

[0152] Specifically, the groove 12 is a circular annular groove coaxial with the accommodating space 23, and the inner diameter of the groove 12 is equal to the diameter of the accommodating space 23. The cross section of the groove 12 is not limited in the embodiment of the present application, and the cross section of the groove 12 can be a square, a right triangle, a right trapezoid or a fan.

[0153] As another optional solution, the groove 12 is an annular groove, and the inner side of the groove 12 completely overlaps with the side of the accommodating space 23. Exemplarily, the outer side of the cross section of the groove 12 is elliptical, and the inner side is circular; or, the groove 12 is a square annular groove, and the outer side of the square annular groove is square, and the inner side is circular.

[0154] The structure of the groove 12 is regular, which is convenient for processing the rivet. The force exerted on the rivet 24 along the second direction caused by the rivet 24 being deflected relative to the first direction enables the protrusions or burrs produced by the rivet 24 to be located in the groove 12.

[0155] As another optional solution, the groove 12 is an arc-shaped groove, and only a part of the side surface of the groove 12 overlaps with the side surface of the accommodating space 23.

[0156] When using a rivet gun to apply a pulling force to the core-pulling nail 24, the deflection direction of the rivet gun is directed in a specific direction so that the convex part of the deformed end face of the sealing nail 21 is directed toward the groove 12, and the deformed part of the end of the accommodating space 23 away from the battery cell 4 is located in the groove 12, thereby keeping the end face of the sealing nail 21 relatively flat.

[0157] In the embodiment of the present application, the thickness of the groove 12 along the first direction is d, and the dimension of the accommodation space 23 along the second direction is e. It should be noted that when the blocking component 2 is fixed on the cover plate 1, the groove 12 may be deformed to a certain extent. When obtaining the dimension a of the groove 12 along the first direction, the distance between the end surface of the blocking component 2 provided with the flange 211 and the bottom wall of the groove 12 can be measured. The distance at this time is not necessarily the dimension along the first direction. However, it can still be considered as the dimension a of the groove 12 along the first direction.

[0158] Specifically, the ratio of d to e, d / e, has a value range of 0.1≤d / e≤0.6. For example, the value of d / e is 0.1, the value of d / e is 0.15, the value of d / e is 0.2, the value of d / e is 0.25, the value of d / e is 0.3, the value of d / e is 0.35, the value of d / e is 0.4, the value of d / e is 0.45, the value of d / e is 0.5, the value of d / e is 0.55, the value of d / e is 0.6, etc. In the embodiment of the present application, the value of d / e is 0.15 as an example for explanation.

[0159] Since the size of the groove 12 along the first direction is affected by the size of the accommodation space 23 along the second direction, the larger the diameter of the opening of the accommodation space 23, the larger the size of the groove 12 along the first direction. When the ratio of the size d of the groove 12 along the first direction to the size e of the accommodation space 23 along the second direction is less than 0.1, the deformation of the end of the sealing pin 21 provided with the flange 211 near the accommodation space 23 will cause the side wall of the groove 12 to deform, thereby reducing the flatness of the end of the sealing pin 21 provided with the flange 211 or causing burrs on the side wall of the groove 12.

[0160] When the ratio of the thickness dimension d of the groove 12 along the first direction to the dimension e of the accommodating space 23 along the second direction is greater than 0.6, the thickness of the groove 12 along the first direction is relatively large, and then when the flange 211 remains unchanged, the strength of the end of the sealing pin 21 provided with the flange 211 is reduced, thereby increasing the deformation of the end of the sealing pin 21 provided with the flange 211 when the sealing assembly 2 is fixedly connected to the cover plate 1.

[0161] In the embodiment of the present application, the thickness of the groove 12 along the second direction is assumed to be f.

[0162] Specifically, the ratio of f to e, f / e, has a value range of 0.1≤f / e≤0.6. For example, the value of f / e is 0.1, the value of f / e is 0.15, the value of d / e is 0.2, the value of f / e is 0.25, the value of f / e is 0.3, the value of d / e is 0.35, the value of f / e is 0.4, the value of f / e is 0.45, the value of f / e is 0.5, the value of f / e is 0.55, the value of f / e is 0.6, etc. In the embodiment of the present application, the value of f / e is 0.15 as an example for explanation.

[0163] The thickness dimension of the groove 12 along the second direction is affected by the dimension of the accommodation space 23 along the second direction. The larger the dimension of the accommodation space 23 along the second direction, the larger the thickness dimension of the groove 12 along the second direction. When the ratio of the thickness dimension f of the groove 12 along the second direction to the dimension e of the accommodation space 23 along the second direction is less than 0.1, the deformation of the end of the sealing pin 21 provided with the flange 211 near the accommodation space 23 may cause the side wall of the groove 12 to deform, thereby reducing the flatness of the end of the sealing pin 21 provided with the flange 211; or causing burrs to appear on the side wall of the groove 12.

[0164] When the ratio of the thickness dimension f of the groove 12 along the second direction to the dimension e of the accommodating space 23 along the second direction is greater than 0.6, the groove 12 is relatively large, and the strength of the end of the sealing pin 21 provided with the flange 211 is reduced, thereby increasing the deformation of the end of the sealing pin 21 provided with the flange 211 when the sealing assembly 2 is fixedly connected to the cover plate 1.

[0165] In the embodiment of the present application, the dimension of the flange 211 along the second direction is g.

[0166] Specifically, the ratio of f to g, f / g, has a value range of 0.1≤f / g≤0.4. For example, the value of f / g is 0.1, the value of f / g is 0.13, the value of f / g is 0.15, the value of f / g is 0.18, the value of f / g is 0.2, the value of f / g is 0.23, the value of f / g is 0.25, the value of f / g is 0.28, the value of f / g is 0.3, the value of f / g is 0.32, the value of f / g is 0.35, the value of f / g is 0.38, the value of f / g is 0.4, etc. In the embodiment of the present application, the value of f / g is 0.15 as an example for explanation.

[0167] When the ratio of the thickness dimension of the groove 12 along the second direction to the dimension of the flange 211 along the second direction is less than 0.1, the deformation of the end of the sealing pin 21 provided with the flange 211 near the accommodating space 23 will cause deformation of the side wall of the groove 12, thereby reducing the flatness of the end of the sealing pin 21 provided with the flange 211.

[0168] When the ratio of the thickness dimension of the groove 12 along the second direction to the dimension of the flange 211 along the second direction is greater than 0.4, the thickness dimension of the groove 12 along the second direction is larger, and the presence of the groove 12 reduces the strength of the flange 211, and increases the deformation of the end of the sealing pin 21 provided with the flange 211 when the plugging assembly 2 is fixedly connected to the cover plate 1. In the case where the deformation of the flange 211 is large, the fixed connection between the plugging assembly 2 and the cover plate 1 may not meet the specified requirements. The higher the strength of the end of the sealing pin 21 provided with the flange 211, the smaller the deformation under force, and the flatness of the end of the sealing pin 21 provided with the flange 211 is further improved.

[0169] In the embodiment of the present application, the dimension of the flange 211 along the first direction is m.

[0170] Specifically, the relationship between d and m satisfies d≤m. It should be noted that the dimension of the groove 12 along the first direction is also the depth of the groove 12 , and the dimension of the flange 211 along the first direction is also the thickness of the flange 211 .

[0171] The depth of the groove 12 is less than the thickness of the flange 211 , which reduces the insufficient strength of the connection between the main body 213 and the flange 211 , meets the strength of the end of the sealing nail 21 provided with the flange 211 , and further meets the structural stability of the sealing nail 21 .

[0172] The battery in the embodiment of the present application further includes a seal 3. The seal 3 is located between the sealing pin 21 and the cover plate 1, and the flange 211 and the two ends of the cover plate 1 and the seal 3 along the first direction correspond to each other and are pressed and sealed. Among them, the seal 3 is used to improve the sealing effect of the sealing pin 21 on the injection hole 11. When the sealing pin 21 is fixed to the cover plate 1, the flange 211 presses the seal 3 on the cover plate 1. At this time, the seal 3 undergoes elastic deformation, and the seal 3 further seals the injection hole 11, thereby improving the sealing effect between the inner cavity of the battery shell and the outside world. A rubber ring can be used for the seal 3.

[0173] Furthermore, the cover plate 1 is provided with a sealing groove 13 for placing the sealing member 3. The sealing groove 13 is provided at one end of the cover plate 1 facing the flange 211, and the sealing groove 13 is a circular groove, and the inner side surface of the sealing groove 13 coincides with the side surface of the accommodating space 23 so that the sealing groove 13 is connected with the accommodating space 23.

[0174] The sealing member 3 is placed in the sealing groove 13 , and one end of the sealing member 3 along the first direction is pressed and in contact with the flange 211 to maintain sealing, and the other end of the sealing member 3 is pressed and in contact with the bottom wall of the sealing groove 13 to maintain sealing.

[0175] Assume that the minimum distance between the seal 3 and the groove 12 is L. Since the seal 3 is elastically deformed by the pressure of the flange 211, the minimum distance L between the seal 3 and the groove 12 can be understood as the gap between the junction of the side wall and the bottom wall of the groove 12 and the junction of the main body 213 and the flange 211, from the side of the main body 213 to the junction of the flange 211 and the seal 3 contacting and pressing surface.

[0176] Specifically, the value range of L is 0.3mm≤L≤0.7mm. For example, the value of L is 0.3mm, the value of L is 0.35mm, the value of L is 0.4mm, the value of L is 0.45mm, the value of L is 0.5mm, the value of L is 0.55mm, the value of L is 0.6mm, the value of L is 0.65mm, the value of L is 0.7mm, etc. In the embodiment of the present application, the value of L is 0.3mm as an example for explanation.

[0177] When the minimum distance L between the seal 3 and the groove 12 is less than 0.3 mm, due to the presence of the groove 12, the thickness of the sealing pin 12 at the connection position between the main body 213 and the flange 211 is small, the strength of the sealing pin 21 is reduced, and there is a risk of the sealing pin 21 breaking and failing. When the minimum distance L between the seal 3 and the groove 12 is greater than 0.7 mm, the thickness of the sealing pin 21 at the flange 211 is too large, the sealing pin 21 is heavy, and the energy density of the battery is reduced after the battery is manufactured.

[0178] In the embodiment of the present application, an avoidance groove 14 is provided on the cover plate 1 , which is communicated with the injection through hole 11 and is located at one end of the cover plate 1 compressed by the flange 211 ; the flange 211 is at least partially located in the avoidance groove 14 .

[0179] Specifically, the avoidance groove 14 is a circular annular groove coaxial with the injection through hole 11, the outer diameter of the avoidance groove 14 is greater than the diameter of the flange 211, the depth of the avoidance groove 14 along the first direction is equal to the thickness of the flange 211 along the first direction, and after the plugging assembly 2 is fixedly connected to the cover plate 1, the flange 211 is located in the avoidance groove 14. The inner diameter of the avoidance groove 14 is equal to the outer diameter of the sealing groove 13, and the avoidance groove 14 is connected to the sealing groove 13.

[0180] It should be noted that the diameter of the flange 211 is smaller than the outer diameter of the avoidance groove 14 and larger than the inner diameter of the avoidance groove 14 , and the flange 211 contacts and presses the bottom wall of the avoidance groove 14 .

[0181] By providing the avoidance groove 14, the end surface of the sealing component 2 fixed on the cover plate 1 and provided with the flange 211 is kept flat, which is convenient for subsequent assembly and connection of the battery and can also reduce the space occupied by the battery along the first direction.

[0182] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0183] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0184] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: A cover plate, wherein a liquid injection through hole is provided on the cover plate; A battery cell, wherein the battery cell is arranged on one side of the cover plate along a first direction, wherein the first direction is an extending direction of the liquid injection through hole; A plugging component, wherein the plugging component passes through the liquid injection through hole, and two ends of the plugging component along the first direction are respectively abutted against two sides of the cover plate along the first direction, so that the plugging component is fixed on the cover plate and blocks the liquid injection through hole; Wherein, the length of the blocking component along the first direction is assumed to be A; Assume that the thickness of the cover plate along the first direction is B; The ratio A / B of A to B has a value range of 2≤A / B≤5.

2. The battery according to claim 1, characterized in that The blocking component comprises: A sealing nail, the sealing nail passes through the liquid injection through hole, the sealing nail comprises a flange and a deformation portion, the flange is arranged on a side of the cover plate away from the battery cell, and the deformation portion is arranged on a side of the cover plate facing the battery cell, so that the sealing nail is fixed on the cover plate and blocks the liquid injection through hole; a forming part, wherein the forming part drives the sealing nail to deform on one side facing the battery core to form the deformation part, the forming part comprises an extrusion part and an abutment part, the extrusion part is arranged close to the battery core, and the abutment part is arranged close to the flange; Wherein, a receiving space for receiving the forming part is provided inside the sealing nail, and a side of the receiving space close to the battery cell has a cavity; Assume that the height of the cavity along the first direction is C; Assume that the thickness of the extrusion portion along the first direction is D; The ratio C / D of the C to the D has a value range of 0.8≤C / D≤1.

3. The battery according to claim 2, characterized in that Assume that the thickness of the deformation portion along the first direction is E; The ratio C / E of the C to E has a value range of 1≤C / E≤3.

4. The battery according to claim 2, characterized in that The minimum thickness of the side wall of the cavity along the second direction is F; the second direction is parallel to the surface of the cover plate facing the battery cell; The ratio C / F of the C to the F has a value range of 1.5≤C / F≤8.

5. The battery according to claim 2, characterized in that A protrusion is provided on the inner wall of the accommodation space, and the protrusion extends from the inner wall of the accommodation space to the inside of the accommodation space; the protrusion and the inner wall of the accommodation space close to the battery core form the cavity; The abutting portion is disposed in the cavity and abuts against the protruding portion.

6. The battery according to claim 5, characterized in that The protrusion has a first surface close to the battery core, the first surface abuts against the abutment portion; a side of the first surface close to the inner wall of the accommodating space is closer to the battery core than a side of the first surface away from the inner wall of the accommodating space.

7. The battery according to claim 2, characterized in that The battery further includes a sealing plate; the sealing plate is arranged on a side of the cover plate close to the flange along the first direction, and the sealing plate at least covers the blocking assembly.

8. The battery according to claim 2, characterized in that The sealing nail further comprises a main body; the main body is provided with the injection through hole; the interior of the main body is provided with the accommodation space; Assume that the maximum thickness of the side wall of the main body connecting the flange and the deformation portion along the second direction is G; wherein the second direction is perpendicular to the first direction; The value range of G is 0.3mm≤G≤1.5mm.

9. The battery according to claim 8, characterized in that Assume that the maximum dimension of the injection through hole along the second direction is M; The ratio G / M of G to M has a value range of 0.1≤G / M≤0.

5.

10. The battery according to claim 1, characterized in that The battery further comprises an insulating member; the insulating member is arranged on a side of the cover plate close to the battery cell, and the insulating member is located between the battery cell and the cover plate; The insulating member is provided with an avoidance hole; the blocking component passes through the avoidance hole.

11. The battery according to claim 2, characterized in that Assume that the minimum wall thickness of the cavity is a; Among them, the value range of a is 0.15mm≤a≤0.5mm.

12. The battery according to claim 11, characterized in that The maximum wall thickness of the cavity is b; The ratio a / b of a to b has a value range of 0.3≤a / b≤0.

7.

13. The battery according to claim 11, characterized in that Assume that the thickness of the extrusion portion along the first direction is c; The ratio a / c of ​​a to c is in the range of 0.15≤a / c≤0.

65.

14. The battery according to claim 2, characterized in that The sealing nail further includes a groove; the groove is arranged at an end of the sealing nail away from the battery cell, and the groove is located at an edge of the accommodating space.

15. The battery according to claim 14, characterized in that Assume that the thickness of the groove along the first direction is d; Assume that the dimension of the accommodation space along the second direction is e; the second direction is parallel to the surface of the cover plate facing the battery cell; The ratio d / e of d to e has a value range of 0.1≤d / e≤0.

6.

16. The battery according to claim 15, characterized in that Assume that the thickness of the groove along the second direction is f; The ratio f / e of f to e has a value range of 0.1≤f / e≤0.

6.

17. The battery according to claim 16, characterized in that The dimension of the flange along the second direction is g; The ratio f / g of f to g has a value range of 0.1≤f / g≤0.

4.

18. The battery according to claim 15, characterized in that The dimension of the flange along the first direction is m; The relationship between d and m satisfies d≤m.

19. The battery according to claim 14, characterized in that The battery further comprises a sealing member; the sealing member is located between the sealing pin and the cover plate; Assume that the minimum distance between the sealing member and the groove is L; Among them, the value range of L is 0.3mm≤L≤0.7mm.

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