Single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery and a battery pack. A cushion block is fixedly connected to the side, facing the electrode assembly in the first direction, of the top cover piece of the single battery. An anti-explosion valve of the single battery is fixedly connected with one side, deviating from a top cover plate, of a cushion block along a first direction, and the anti-explosion valve and the top cover plate are arranged at an interval in the first direction. In other words, the explosion-proof valve and the top cover piece are arranged at an interval through the cushion block, the explosion-proof valve is far away from the top cover piece as far as possible, and therefore when the top cover piece is subjected to external impact, structural damage and failure of the explosion-proof valve caused by external impact can be avoided as far as possible, and the risk that the explosion-proof valve is damaged due to external impact can be reduced.

Description

Technical Field

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

[0002] As the core component and energy source of electric vehicles, the power battery is currently a key research focus. The storage capacity of the power battery determines the vehicle's driving range. A battery typically consists of a top cover, bottom casing, and electrode components. Currently, batteries usually employ a design with the explosion-proof valve facing downwards. In the event of thermal runaway, the ejected material can be directed towards the bottom of the vehicle, preventing it from reaching the passenger compartment. However, when the battery is subjected to impact, the explosion-proof valve is prone to structural damage or failure due to external impact, leading to communication between the battery's internal components and the external environment, potentially causing leakage, fire, and other safety issues. Utility Model Content

[0003] This application provides a single battery cell and a battery pack that can reduce the risk of explosion-proof valves being damaged by external impacts.

[0004] This application provides a single-cell battery. The single-cell battery has a first orientation. The single-cell battery includes a housing. The single-cell battery also includes an electrode assembly disposed within the housing. The single-cell battery further includes a top cover plate connected to one end of the housing along the first orientation, and the top cover plate has a first pressure relief hole extending through the first orientation. The single-cell battery also includes an insulating member disposed within the housing, located on the side of the top cover plate facing the electrode assembly, and having a receiving groove on the side of the insulating member near the top cover plate along the first orientation. The single-cell battery also includes a pad, fixedly connected to the side of the top cover plate facing the electrode assembly along the first orientation, and located within the receiving groove. The single-cell battery also includes an explosion-proof valve, fixedly connected to the side of the pad away from the top cover plate along the first orientation, located within the receiving groove, and sealing the first pressure relief hole. The explosion-proof valve and the top cover plate are spaced apart along the first orientation.

[0005] In one embodiment of this application, the pad is provided with a second pressure relief hole that extends through a first direction. The second pressure relief hole is connected to the first pressure relief hole, and the explosion-proof valve covers the second pressure relief hole, thereby covering the first pressure relief hole.

[0006] In one embodiment of this application, the explosion-proof valve is provided with an explosion-proof groove on one side corresponding to the second pressure relief hole. The explosion-proof groove is recessed in the direction of the first direction toward the electrode assembly. The projection of the explosion-proof groove in the plane where the explosion-proof valve is located in the first direction at least partially coincides with the projection of the hole wall of the second pressure relief hole in the plane where the explosion-proof valve is located in the first direction.

[0007] In one embodiment of this application, the explosion-proof valve has a first groove on the side away from the electrode assembly. The first groove is recessed towards the electrode assembly along a first direction. The first groove is connected to a second pressure relief hole. An explosion-proof groove is provided on the bottom wall of the first groove. The depth of the explosion-proof groove along the first direction is less than the depth of the first groove along the first direction.

[0008] In one embodiment of this application, a second groove is provided on the side of the pad away from the top cover plate. The second groove is recessed in the direction away from the electrode assembly along the first direction, and the explosion-proof valve is disposed in the second groove.

[0009] In one embodiment of this application, the insulating member is provided with a connecting protrusion on the side facing the top cover sheet along the first direction, and the top cover sheet is provided with a connecting groove on the side facing the insulating member along the first direction, and the connecting protrusion is embedded in the connecting groove.

[0010] In one embodiment of this application, the single battery cell further includes: a protective sheet, which is fixedly connected to the side of the top cover sheet away from the electrode assembly, the protective sheet is disposed on the first pressure relief hole, and the protective sheet is disposed opposite to the explosion-proof valve along the first direction.

[0011] In one embodiment of this application, the height of the pad along the first direction is greater than the height of the explosion-proof valve along the first direction.

[0012] In one embodiment of this application, the pad is made of metal.

[0013] Accordingly, this application also provides a battery pack, including a single battery cell as described in the above embodiments.

[0014] The beneficial effects of this application are as follows: Unlike the prior art, this application provides a single-cell battery and a battery pack. A pad is fixedly connected to the top cover of the single-cell battery on the side facing the electrode assembly along a first direction. The explosion-proof valve of the single-cell battery is fixedly connected to the pad on the side facing away from the top cover along the first direction, and the explosion-proof valve and the top cover are spaced apart in the first direction. In other words, this application uses the pad to space the explosion-proof valve from the top cover, keeping the explosion-proof valve as far away from the top cover as possible. This minimizes the risk of structural damage or failure of the explosion-proof valve due to external impact when the top cover is subjected to external impact. Attached Figure Description

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

[0016] Figure 1This is an exploded structural diagram of a single-cell battery according to an embodiment of this application;

[0017] Figure 2 This is an exploded structural diagram of an embodiment of the top cover assembly of this application;

[0018] Figure 3 This is a cross-sectional structural schematic diagram of the first embodiment of the top cover assembly of this application;

[0019] Figure 4 yes Figure 3 The diagram shows the structure of area A of the top cover assembly.

[0020] Figure 5 yes Figure 4 The diagram shows the structure of region B of the top cover assembly.

[0021] Figure 6 This is a schematic diagram of the structure of one embodiment of the pad block of this application;

[0022] Figure 7 This is a cross-sectional structural schematic diagram of the second embodiment of the top cover assembly of this application;

[0023] Figure 8 This is a cross-sectional structural schematic diagram of the third embodiment of the top cover assembly of this application.

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

[0025] 10 Single cell; 11 Casing; 12 Electrode assembly; 13 Top cover; 131 First pressure relief hole; 132 Protrusion; 14 Pad; 141 Second pressure relief hole; 142 Second groove; 15 Explosion-proof valve; 151 Explosion-proof groove; 152 First groove; 16 Insulating component; 161 Connecting protrusion; 162 Receiving groove; 17 Protective plate. Detailed Implementation

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

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

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

[0029] To address the technical problem that explosion-proof valves in the prior art are easily damaged by external impacts, one embodiment of this application provides a single-cell battery. The single-cell battery has a first orientation. The single-cell battery includes a housing. The single-cell battery also includes an electrode assembly disposed within the housing. The single-cell battery further includes a top cover plate connected to one end of the housing along the first orientation, and the top cover plate has a first pressure relief hole extending through the first orientation. The single-cell battery also includes an insulating member disposed within the housing, located on the side of the top cover plate facing the electrode assembly, and having a receiving groove on the side of the insulating member near the top cover plate along the first orientation. The single-cell battery also includes a pad, fixedly connected to the side of the top cover plate facing the electrode assembly along the first orientation, and located within the receiving groove. The single-cell battery also includes an explosion-proof valve, fixedly connected to the pad on the side of the pad away from the top cover plate along the first orientation, the explosion-proof valve being disposed within the receiving groove, the explosion-proof valve sealing the first pressure relief hole, and the explosion-proof valve and the top cover plate being spaced apart along the first orientation. The following is a detailed description.

[0030] Please see Figure 1 , Figure 1 This is an exploded structural diagram of a single-cell battery according to an embodiment of this application.

[0031] In one embodiment, the battery pack includes individual battery cells 10. Specifically, the plurality of individual battery cells 10 are housed in a housing. Individual battery cells 10 include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this disclosure does not limit them. The battery pack provides power to electrical devices. Electrical devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0032] Please refer to the following: Figures 2 to 4 , Figure 2 This is an exploded structural diagram of an embodiment of the top cover assembly of this application. Figure 3 This is a cross-sectional structural diagram of the first embodiment of the top cover assembly of this application. Figure 4 yes Figure 3 The diagram shows the structure of area A of the top cover assembly.

[0033] In one embodiment, the single-cell battery 10 has a first direction Z. The single-cell battery 10 includes a housing 11. The single-cell battery 10 also includes an electrode assembly 12 disposed within the housing 11. The electrode assembly 12 is formed by laminating and / or winding electrode sheets and a separator. The single-cell battery 10 also includes a top cover sheet 13 connected to one end of the housing 11 along the first direction Z, i.e., the top cover sheet 13 covers one end of the housing 11 in the first direction Z. The terminal post of the single-cell battery 10 is disposed on the top cover sheet 13. The single-cell battery 10 also includes an insulating member 16 disposed within the housing 11, located on the side of the top cover sheet 13 facing the electrode assembly 12.

[0034] The top cover plate 13 is provided with a first pressure relief hole 131 extending through the top cover plate 13 in the first direction Z. The insulating member 16 is provided with a receiving groove 162 on the side of the top cover plate 13 along the first direction Z, near the top cover plate 13. The single cell 10 also includes a pad 14, which is fixedly connected to the top cover plate 13 on the side facing the electrode assembly 12 along the first direction Z, and the pad 14 is located within the receiving groove 162. The single cell 10 also includes an explosion-proof valve 15, which is fixedly connected to the pad 14 on the side away from the top cover plate 13 along the first direction Z, the explosion-proof valve 15 is located within the receiving groove 162, the explosion-proof valve 15 covers the first pressure relief hole 131, and the explosion-proof valve 15 and the top cover plate 13 are spaced apart in the first direction Z. When thermal runaway occurs inside the single cell 10, the explosion-proof valve 15 opens in time, and the high-temperature and high-pressure gas inside the single cell 10 is discharged through the first pressure relief hole 131 to release the internal pressure of the single cell 10 and prevent the single cell 10 from exploding or rupturing due to excessive pressure as much as possible.

[0035] In this embodiment, the explosion-proof valve 15 and the top cover plate 13 are spaced apart by the pad 14, so that the explosion-proof valve 15 is as far away from the top cover plate 13 as possible. In this way, when the top cover plate 13 is subjected to external impact, the explosion-proof valve 15 can be prevented from being damaged or malfunctioning due to external impact as much as possible, that is, the risk of the explosion-proof valve 15 being damaged due to external impact can be reduced.

[0036] In one embodiment, the pad 14 is provided with a second pressure relief hole 141 extending through the pad 14 in the first direction Z. The second pressure relief hole 141 communicates with the first pressure relief hole 131, and the explosion-proof valve 15 covers the second pressure relief hole 141, thereby covering the first pressure relief hole 131. Thus, when thermal runaway occurs inside the single cell 10, the explosion-proof valve 15 opens, and the high-temperature and high-pressure gas inside the single cell 10 is discharged sequentially through the second pressure relief hole 141 and the first pressure relief hole 131, releasing the internal pressure of the single cell 10 and preventing the single cell 10 from exploding or rupturing due to excessive pressure as much as possible.

[0037] Please refer to the following: Figure 5 , Figure 5 yes Figure 4 The diagram shows the structure of region B of the top cover assembly.

[0038] In one embodiment, the explosion-proof valve 15 is provided with an explosion-proof notch 151. The structural strength of the explosion-proof valve 15 at the explosion-proof notch 151 is weaker than that at other locations on the explosion-proof valve 15. Thus, under the internal pressure of the single cell 10, the explosion-proof notch 151 cracks before other locations on the explosion-proof valve 15, allowing the internal pressure of the single cell 10 to be released. In this embodiment, the explosion-proof valve 15 is provided with an explosion-proof notch 151 on one side corresponding to the second pressure relief hole 141. The explosion-proof notch 151 is recessed along the first direction Z towards the electrode assembly 12. The projection of the explosion-proof notch 151 along the first direction Z onto the plane where the explosion-proof valve 15 is located at least partially coincides with the projection of the hole wall of the second pressure relief hole 141 along the first direction Z onto the plane where the explosion-proof valve 15 is located.

[0039] Furthermore, the explosion-proof valve 15 has a first groove 152 on the side opposite to the electrode assembly 12. The first groove 152 is recessed along the first direction Z towards the electrode assembly 12, and the first groove 152 communicates with the second pressure relief hole 141. An explosion-proof groove 151 is provided on the bottom wall of the first groove 152, and the depth of the explosion-proof groove 151 along the first direction Z is less than the depth of the first groove 152 along the first direction Z.

[0040] In this embodiment, the explosion-proof valve 15 is provided with a first groove 152 and an explosion-proof notch 151 is provided on the bottom wall of the first groove 152, so that the explosion-proof notch 151 is further away from the top cover plate 13. In this way, when the top cover plate 13 is subjected to external impact, the explosion-proof notch 151 can be further prevented from being damaged or malfunctioning due to external impact, and the risk of the explosion-proof valve 15 being damaged due to external impact can be further reduced.

[0041] Furthermore, in this embodiment, the depth of the explosion-proof groove 151 along the first direction Z is less than the depth of the first groove 152 along the first direction Z. In other words, the first groove 152 has a larger depth in the first direction Z, which makes the explosion-proof groove 151 further away from the top cover plate 13. Thus, when the top cover plate 13 is subjected to external impact, the explosion-proof groove 151 can be further prevented from being damaged or failing due to external impact, and the risk of the explosion-proof valve 15 being damaged due to external impact can be further reduced.

[0042] Of course, in other embodiments of this application, the explosion-proof valve 15 may also have an explosion-proof groove 151 on the side away from the second pressure relief hole 141, and the explosion-proof groove 151 may be recessed in the first direction Z toward the direction away from the electrode assembly 12, which is not limited here.

[0043] In one embodiment, the height of the pad 14 along the first direction Z is greater than the height of the explosion-proof valve 15 along the first direction Z. In other words, the pad 14 has a greater height in the first direction Z, which further moves the explosion-proof valve 15 away from the top cover plate 13. Thus, when the top cover plate 13 is subjected to external impact, the explosion-proof valve 15 can be further prevented from being damaged or malfunctioning due to external impact, and the risk of damage to the explosion-proof valve 15 due to external impact can be further reduced.

[0044] Specifically, the top cover plate 13 has a dimension of H mm in the first direction Z, and the minimum dimension of the pad 14 in the first direction Z is h mm, satisfying: H / 4≤h≤4. This embodiment, by reasonably setting the dimension of the pad 14 in the first direction Z, ensures that the pad 14 has sufficient thickness in the first direction Z, allowing the explosion-proof valve 15 to be kept away from the top cover plate 13, reducing the risk of damage to the explosion-proof valve 15 due to external impact. Furthermore, it avoids the pad 14 from being too large in the first direction Z, which would occupy too much internal space of the individual battery 10, thus preventing any impact on the energy density of the individual battery 10.

[0045] In one embodiment, the explosion-proof valve 15 is fixedly connected to the pad 14 on the side opposite to the top cover plate 13 along the first direction Z. Specifically, in the first direction Z, the side of the pad 14 opposite to the top cover plate 13 is a relatively flat surface. The explosion-proof valve 15 is fixedly connected to the surface of the pad 14 on the side opposite to the top cover plate 13, so that the explosion-proof valve 15 is as far away from the top cover plate 13 as possible. In this way, when the top cover plate 13 is subjected to external impact, the explosion-proof valve 15 can be prevented from being damaged or malfunctioning due to external impact as much as possible, that is, the risk of damage to the explosion-proof valve 15 due to external impact can be reduced.

[0046] In one embodiment, the insulating member 16 has a connecting protrusion 161 on the side facing the top cover plate 13 along the first direction Z, and the connecting protrusion 161 is connected to the top cover plate 13. The top cover plate 13 has a connecting groove on the side facing the insulating member 16 along the first direction Z, and the connecting protrusion 161 is embedded in the connecting groove, so that the top cover plate 13 and the insulating member 16 are relatively fixed. Of course, in other embodiments of this application, the top cover plate 13 may not have a connecting groove on the side facing the insulating member 16 along the first direction Z, and the connecting protrusion 161 on the insulating member 16 may be thermally fused to the top cover plate 13, etc.

[0047] In one embodiment, the single cell 10 further includes a protective sheet 17, which is fixedly connected to the side of the top cover 13 opposite to the electrode assembly 12. The protective sheet 17 covers the first pressure relief hole 131 and is disposed opposite to the explosion-proof valve 15 along the first direction Z. In this way, the protective sheet 17 is located outside the top cover 13, which can prevent external impurities from reaching the explosion-proof valve 15 through the first pressure relief hole 131, further helping to ensure the stability of the explosion-proof valve 15.

[0048] For example, the pad 14 can be made of pure aluminum or aluminum alloy. The pad 14 is ring-shaped, surrounding the outer periphery of the first pressure relief hole 131, and a second pressure relief hole 141 is formed in the center of the pad 14. The opening area of ​​the second pressure relief hole 141 is not less than the opening area of ​​the first pressure relief hole 131, such that the orthographic projection of the second pressure relief hole 141 onto the top cover plate 13 can cover the first pressure relief hole 131. The pad 14 can directly contact the top cover plate 13 and be fixedly connected by welding or other processes. The side of the pad 14 facing the electrode assembly 12 is in direct contact with the explosion-proof valve 15 and is fixedly connected by welding or other processes. The opening area of ​​the second pressure relief hole 141 is not less than the area enclosed by the explosion-proof markings 151 on the explosion-proof valve 15.

[0049] The housing 11 has a receiving cavity. The electrode assembly 12 is inserted into the receiving cavity through the opening of the housing 11. Then, the top cover plate 13 is partially or completely installed into the housing 11, and the housing 11 and the top cover plate are fixed together by welding or other processes. The thickness of the top cover plate 13 can be 2 mm. The center of the first pressure relief hole 131 coincides with the center of the top cover plate 13. The first pressure relief hole 131 is formed by two semi-circular through holes connected by a straight through hole. The radius of the semi-circular through holes can be 8 mm, and the distance between the centers of the two semi-circular through holes can be 12 mm. The line connecting the centers of the two semi-circular through holes is parallel to the long side of the top cover plate 13. The pad 14 is fixed to the top cover plate 13 by laser welding. The pad 14 is waist-shaped and annular, and the center of the pad 14 coincides with the center of the top cover plate 13. The thickness of the pad 14 can be 1mm, the radius of the semicircular portion of the outer contour of the pad 14 can be 13mm, the distance between the centers of the two semicircles of the outer contour of the pad 14 can be 12mm, and the line connecting the centers of the two semicircles of the outer contour of the pad 14 is parallel to the long side of the top cover plate 13. The outer contour of the pad 14 is offset inward by 5mm to obtain the inner ring contour. The explosion-proof valve 15 can be a waist-shaped piece, and the explosion-proof valve 15 is fixed to the pad 14 by welding. The thickness of the explosion-proof valve 15 can be 0.55mm, the radius of the semicircle of the outer contour of the explosion-proof valve 15 can be 10mm, the distance between the centers of the two semicircles of the outer contour of the explosion-proof valve 15 can be 12mm, and the area enclosed by the explosion-proof groove 151 can be 350mm². 2 .

[0050] Please refer to the following: Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of one embodiment of the pad block of this application. Figure 7 This is a cross-sectional structural schematic diagram of the second embodiment of the top cover assembly of this application.

[0051] In an alternative embodiment, the difference between this embodiment and the above embodiment is that the pad 14 has a second groove 142 on the side opposite to the top cover plate 13. The second groove 142 is recessed in the first direction Z towards the direction opposite to the electrode assembly 12, and the explosion-proof valve 15 is disposed in the second groove 142. In this embodiment, the pad 14 is provided with the second groove 142 to position the installation position of the explosion-proof valve 15, so that the explosion-proof valve 15 can be quickly and accurately installed on the pad 14, and the position of the explosion-proof valve 15 can be kept relatively fixed during the connection process between the explosion-proof valve 15 and the pad 14, which is beneficial to improving the assembly efficiency of the explosion-proof valve 15.

[0052] The second groove 142 is located on the side of the second pressure relief hole 141 opposite to the first pressure relief hole 131. The area enclosed by the outer contour of the second groove 142 is not less than the area of ​​the explosion-proof valve 15, ensuring that the explosion-proof valve 15 can be installed in the second groove 142. The housing 11 has a receiving cavity. The electrode assembly 12 is placed into the receiving cavity through the opening of the housing 11, and then the top cover plate 13 is partially or completely installed into the housing 11, and the housing 11 and the top cover plate are fixed by welding or other processes. The thickness of the top cover plate 13 can be 1.5mm. The center of the first pressure relief hole 131 coincides with the center of the top cover plate 13. The first pressure relief hole 131 is formed by two semi-circular through holes connected by a straight through hole. The radius of the semi-circular through holes can be 6.1mm, the distance between the centers of the two semi-circular through holes can be 10mm, and the line connecting the centers of the two semi-circular through holes is parallel to the long side of the top cover plate 13. The spacer 14 is fixed to the top cover plate 13 by laser welding. The spacer 14 is an oblong ring, and its center coincides with the center of the top cover plate 13. The thickness of the spacer 14 can be 0.5mm, the radius of the semicircular portion of the outer contour of the spacer 14 can be 13mm, the distance between the centers of the two semicircles of the outer contour of the spacer 14 can be 10mm, and the line connecting the centers of the two semicircles of the outer contour of the spacer 14 is parallel to the long side of the top cover plate 13. The outer contour of the spacer 14 is offset inward by 5.5mm to obtain the inner contour. The bottom of the second groove 142 on the spacer 14 is welded to the explosion-proof valve 15. The radius of the semicircle of the outer contour of the second groove 142 can be 8.2mm, the distance between the centers of the semicircles of the outer contour of the second groove 142 can be 10mm, and the depth of the second groove 142 can be 0.55mm. The explosion-proof valve 15 can be an oblong plate, and it is fixed to the spacer 14 by welding. The thickness of the explosion-proof valve 15 can be 0.5mm, the radius of the semicircle of the outer contour of the explosion-proof valve 15 can be 8mm, the distance between the centers of the two semicircles of the outer contour of the explosion-proof valve 15 can be 10mm, and the area enclosed by the explosion-proof markings 151 can be 180mm². 2 .

[0053] Please refer to the following: Figure 8 , Figure 8 This is a cross-sectional structural schematic diagram of the third embodiment of the top cover assembly of this application.

[0054] In an alternative embodiment, the difference between this embodiment and the above embodiment is that the top cover plate 13 has a protrusion 132 protruding from the side facing the electrode assembly 12. The protrusion 132 is arranged around the outer periphery of the first pressure relief hole 131, and the pad 14 is disposed in the area enclosed by the protrusion 132. In this embodiment, the top cover plate 13 is provided with the protrusion 132 to position the installation position of the pad 14, so that the pad 14 can be quickly and accurately installed on the top cover plate 13, and the position of the pad 14 can be kept relatively fixed during the connection between the pad 14 and the top cover plate 13, which is beneficial to improving the assembly efficiency of the pad 14. The explosion-proof valve 15 is fixedly connected to the side of the pad 14 away from the top cover plate 13.

[0055] In summary, this application provides a single-cell battery and a battery pack. A pad is fixedly connected to the top cover of the single-cell battery along a first direction towards the electrode assembly. The explosion-proof valve of the single-cell battery is fixedly connected to the pad, and the explosion-proof valve is disposed within the housing, spaced apart from the top cover in the first direction. In other words, this application uses the pad to space the explosion-proof valve from the top cover, keeping the explosion-proof valve as far away from the top cover as possible. This minimizes the risk of structural damage or failure of the explosion-proof valve due to external impact when the top cover is subjected to external impact.

[0056] The single-cell battery and battery pack provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A single-cell battery having a first orientation, characterized in that, include: case; Electrode assemblies are disposed within the housing; A top cover plate is connected to one end of the housing along the first direction, and the top cover plate is provided with a first pressure relief hole penetrating along the first direction; An insulating element is disposed within the housing. The insulating element is located on the side of the top cover plate facing the electrode assembly. The insulating element has a receiving groove on the side of the top cover plate along the first direction near the top cover plate. A pad is fixedly connected to the top cover plate along the first direction toward the electrode assembly, and the pad is located in the receiving groove; as well as An explosion-proof valve is fixedly connected to the pad on the side away from the top cover plate along the first direction. The explosion-proof valve is disposed in the receiving groove. The explosion-proof valve covers the first pressure relief hole, and the explosion-proof valve and the top cover plate are spaced apart in the first direction.

2. The single-cell battery according to claim 1, characterized in that, The pad block is provided with a second pressure relief hole that extends through the first direction. The second pressure relief hole is connected to the first pressure relief hole. The explosion-proof valve cover seals the second pressure relief hole, thereby sealing the first pressure relief hole.

3. The single-cell battery according to claim 2, characterized in that, The explosion-proof valve has an explosion-proof groove on one side corresponding to the second pressure relief hole. The explosion-proof groove is recessed towards the electrode assembly along the first direction. The projection of the explosion-proof groove along the first direction onto the plane where the explosion-proof valve is located at least partially coincides with the projection of the hole wall of the second pressure relief hole along the first direction onto the plane where the explosion-proof valve is located.

4. The single-cell battery according to claim 3, characterized in that, The explosion-proof valve has a first groove on the side away from the electrode assembly. The first groove is recessed towards the electrode assembly along the first direction. The first groove is connected to the second pressure relief hole. The explosion-proof groove is provided on the bottom wall of the first groove. The depth of the explosion-proof groove along the first direction is less than the depth of the first groove along the first direction.

5. The single-cell battery according to claim 1, characterized in that, The pad has a second groove on the side away from the top cover plate. The second groove is recessed in the direction away from the electrode assembly along the first direction. The explosion-proof valve is disposed in the second groove.

6. The single-cell battery according to claim 1, characterized in that, The insulating component has a connecting protrusion on the side facing the top cover plate along the first direction, and the top cover plate has a connecting groove on the side facing the insulating component along the first direction, with the connecting protrusion embedded in the connecting groove.

7. The single-cell battery according to claim 1, characterized in that, The single battery cell also includes: A protective sheet is fixedly connected to the top cover sheet on the side opposite to the electrode assembly. The protective sheet covers the first pressure relief hole and is arranged opposite to the explosion-proof valve along the first direction.

8. The single-cell battery according to claim 1, characterized in that, The height of the pad along the first direction is greater than the height of the explosion-proof valve along the first direction.

9. The single-cell battery according to claim 1, characterized in that, The pad is made of metal.

10. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 9.

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