An electric cell and a battery pack

Abstract

The utility model embodiment provides a kind of electric core and battery pack, explosion-proof valve includes: valve body, including vertical first direction and second direction;Supporting platform, the supporting platform is set to the valve body, the supporting platform extends along the first direction, the supporting platform is along second direction and the valve body is divided into two sub valve bodies;Score and reinforcing section, the score and reinforcing section are along the circumferential setting of the sub valve body, and one end of the score and one end of the reinforcing section are connected, the other end of the score and the other end of the reinforcing section are connected, and the structural strength of the reinforcing section is greater than the structural strength of the score. It can ensure that explosion-proof valve is normally opened, has good pressure relief function, and also can avoid the problem that explosion-proof valve flies out.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] In the existing technology, in order to ensure the safety of battery cell use, an explosion-proof valve is usually installed on the top cover or shell of the battery cell. When a large amount of gas is generated inside the battery cell and the temperature rises sharply, the internal pressure becomes too high and the explosion-proof valve will be opened to relieve pressure and ensure the safety performance of the battery cell.

[0003] However, existing explosion-proof valves have a problem where the upward tilt is too high after opening, causing the valve to fail to open properly or fly out. Utility Model Content

[0004] In view of the above problems, the present invention provides a battery cell and battery pack that overcomes or at least partially solves the above problems.

[0005] To address the aforementioned problems, in a first aspect, this utility model discloses a battery cell, the battery cell including an explosion-proof valve, the explosion-proof valve comprising:

[0006] The valve body includes a vertical first direction and a vertical second direction;

[0007] A support platform is disposed on the valve body, the support platform extends along the first direction, and the support platform divides the valve body into two sub-valve bodies along the second direction;

[0008] The sub-valve body has a groove and a reinforcing section, which are arranged circumferentially along the sub-valve body. One end of the groove is connected to one end of the reinforcing section, and the other end of the groove is connected to the other end of the reinforcing section. The structural strength of the reinforcing section is greater than that of the groove.

[0009] Optionally, the explosion-proof valve includes a first protrusion connected to the support platform, and one end of the first protrusion away from the support platform extends in a direction away from the sub-valve body.

[0010] And / or, the explosion-proof valve includes a second protrusion connected to the reinforcing section, the end of the second protrusion away from the reinforcing section extending in a direction away from the sub-valve body;

[0011] And / or, the explosion-proof valve includes a third protrusion connected to the sub-valve body, the third protrusion being located on the side of the reinforcing section away from the support platform, and the end of the third protrusion away from the sub-valve body extending toward the support platform.

[0012] Optionally, the sub-valve body has a mounting surface, and the grooves and the reinforcing section are arranged around the mounting surface;

[0013] Along the third direction, the orthographic projection of the first protrusion at least partially falls within the mounting surface, and the orthographic projection of the second protrusion at least partially falls within the mounting surface; the third direction, the first direction, and the second direction are perpendicular to each other;

[0014] The extension direction of the third protrusion is set at an obtuse angle with the mounting surface.

[0015] Optionally, the reinforcing segment is elongated and extends along the first direction.

[0016] Optionally, along the second direction, the reinforcing section is disposed on the side of the sub-valve body away from the support platform.

[0017] Optionally, the reinforcing section is arranged adjacent to the support platform.

[0018] Optionally, the two sub-valve bodies are symmetrically distributed on both sides of the support platform along the second direction.

[0019] Optionally, the reinforcing sections provided on the two sub-valve bodies are respectively the first reinforcing section and the second reinforcing section;

[0020] The first reinforcing section is disposed adjacent to the support platform;

[0021] Along the second direction, the second reinforcing section is disposed on the side of the sub-valve body away from the support platform.

[0022] Optionally, the third direction is perpendicular to the plane containing the first direction and the second direction;

[0023] Along the third direction, the height of the support platform is H1, the height of the reinforcing section is H2, and the height of the sub-valve body at the position of the notch is H3, where H3 < H2 ≤ H1.

[0024] Optionally, the length of the reinforcing segment extending in the first direction is L, where 6mm ≤ L ≤ 15mm.

[0025] Optionally, the grooves and reinforcing sections in the same sub-valve body enclose a closed shape, the closed shape including at least one of a circle, an ellipse, a racetrack shape, a semicircle, a semi-ellipse, and a semi-racetrack shape.

[0026] Optionally, the battery cell includes:

[0027] Top cover;

[0028] A housing, wherein the housing and the top cover are connected and enclose a receiving cavity;

[0029] A battery cell body, wherein the battery cell body is disposed within the receiving cavity;

[0030] A terminal post, which is disposed on the top cover and electrically connected to the battery cell body;

[0031] And the aforementioned explosion-proof valve, wherein the explosion-proof valve is disposed on the top cover or the housing.

[0032] Secondly, this utility model also discloses a battery pack, including the above-mentioned battery cells, wherein a plurality of the battery cells are stacked along the first direction, or a plurality of the battery cells are stacked along the second direction.

[0033] The embodiments of this utility model have the following advantages:

[0034] In this embodiment of the utility model, the support platform divides the valve body into two sub-valve bodies, each of which is provided with grooves, so that there are two valve opening faces on the valve body. In this way, when the explosion-proof valve is opened, both valve opening faces are opened, so that the upward tilting height of each valve opening face is moderate, thereby ensuring that the explosion-proof valve can be opened normally and has a good pressure relief function. At the same time, due to the strong structural strength of the reinforcing section, the problem of the explosion-proof valve flying out can also be avoided. Attached Figure Description

[0035] Figure 1 This is a top view of an explosion-proof valve according to this utility model;

[0036] Figure 2 This is a schematic diagram of a structure for arranging the first protrusion according to this utility model;

[0037] Figure 3 This is a schematic diagram of a structure for arranging the second protrusion according to this utility model;

[0038] Figure 4 This is a schematic diagram of a structure for arranging the third protrusion according to this utility model;

[0039] Figure 5 This is a schematic diagram of the structure of an explosion-proof valve of this utility model in a certain direction;

[0040] Figure 6 This is a top view of another explosion-proof valve of this utility model;

[0041] Figure 7 This is a cross-sectional view of an explosion-proof valve according to this utility model;

[0042] Figure 8 This is a schematic diagram of the structure of another explosion-proof valve of this utility model in a certain direction;

[0043] Figure 9This is a schematic diagram of a structure of multiple battery cells stacked together according to this utility model.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Battery cell;

[0046] 10. Explosion-proof valve; 101. Valve body; 1011. Sub-valve body; 10111. Third protrusion; 10112. Mounting surface; 102. Support platform; 1021. First protrusion; 103. Score; 104. Reinforcing section; 1041. Second protrusion; 105. First reinforcing section; 106. Second reinforcing section;

[0047] 20. Pole post;

[0048] 30. Top cover;

[0049] 40. Shell. Detailed Implementation

[0050] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0052] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] Firstly, one of the core concepts of this utility model embodiment is to disclose a battery cell 1, which includes an explosion-proof valve 10. The battery cell 1 can be applied to battery fields such as new energy vehicle battery packs, energy storage battery systems, and electric ship power battery boxes.

[0055] For example, in a confined environment, gas accumulation can cause a sharp increase in internal pressure of cell 1, potentially leading to bulging, rupture, or even explosion of the casing. The explosion-proof valve 10 can release pressure when the internal pressure of cell 1 is high, preventing bulging, rupture, or explosion of cell 1.

[0056] Specifically, during the charging and discharging process, gas may be generated due to internal chemical reactions and various factors, which may cause the internal pressure of the battery pack to rise. When the pressure reaches a certain level, the explosion-proof valve 10 will automatically open to discharge the excess gas, thereby releasing the internal pressure of the battery pack and preventing the battery pack from rupturing or even exploding due to excessive internal pressure.

[0057] Furthermore, the explosion-proof valve 10 can prevent external open flames or sparks from entering the battery pack, thus providing isolation and protection and reducing the risk of combustion or explosion. When the battery pack's operating environment changes, such as changes in temperature or altitude, it can lead to an imbalance in air pressure inside and outside the battery pack. The explosion-proof valve 10 can regulate the pressure difference to a certain extent, preventing damage to the battery pack due to pressure imbalance and ensuring the battery pack's performance and safety.

[0058] Further, the explosion-proof valve 10 includes a valve body 101, which may include a vertical first direction X and a second direction Y; a support platform 102, which is disposed on the valve body 101 and extends along the first direction. The support platform 102 can divide the valve body 101 into two sub-valve bodies 1011 along the second direction Y; a notch 103 and a reinforcing section 104, which are arranged circumferentially along the sub-valve bodies 1011. One end of the notch 103 is connected to one end of the reinforcing section 104, and the other end of the notch 103 is connected to the other end of the reinforcing section 104. The structural strength of the reinforcing end is greater than the structural strength of the notch 103.

[0059] In this embodiment of the utility model, the support platform 102 divides the valve body 101 into two sub-valve bodies 1011. Each sub-valve body 1011 is provided with a notch 103, so that there are two valve opening surfaces on the valve body 101. In this way, when the explosion-proof valve 10 is opened, both valve opening surfaces are opened, so that the upward tilting height of each valve opening surface is moderate, thereby ensuring that the explosion-proof valve 10 can be opened normally and has a good pressure relief function. At the same time, due to the strong structural strength of the reinforcing section 104, the problem of the explosion-proof valve 10 flying out can also be avoided.

[0060] In this embodiment of the utility model, the valve body 101 is the main structure of the explosion-proof valve 10, such as... Figure 1 As shown, the valve body 101 may include a first direction X and a second direction Y, which are perpendicular. The first direction X is the length direction of the explosion-proof valve 10, and the second direction Y is the width direction of the explosion-proof valve 10. The support platform 102 is disposed along the first direction X, such that the support platform 102 extends along the first direction X.

[0061] Specifically, the third direction Z, the first direction X, and the second direction Y are mutually perpendicular, and the third direction Z can be the thickness direction of the valve body 101. In this embodiment of the present invention, perpendicularity includes "perpendicular" and "approximately perpendicular".

[0062] Specifically, the support platform 102 enhances the structural strength of the valve body 101. In some embodiments, the support platform 102 is positioned on the central axis of the valve body 101 to divide it into two uniform sub-valve bodies 1011 along the second direction Y, thereby strengthening the explosion-proof valve 10 and reducing the risk of deformation. In other embodiments, the support platform 102 is positioned near the central axis of the valve body 101, ensuring the two sub-valve bodies 1011 are evenly distributed.

[0063] Specifically, each sub-valve body 1011 is provided with a notch 103 and a reinforcing section 104. Because the notch 103 is provided on each sub-valve body 101, two valve opening surfaces can be formed on the valve body 101. Thus, when the pressure inside the battery pack is too high, the notch 103 is opened, and both valve opening surfaces open, enabling pressure relief of the battery pack. In this embodiment, the valve body 101 is divided into two sub-valve bodies 1011 by the support platform 102 to form two valve opening surfaces. This results in a lower upward tilting height when the valve opening surfaces open, improving the smoothness of valve opening and facilitating rapid venting. The upward tilting height of the valve opening surface is the tilting height of the valve opening surface along the third direction Z.

[0064] Furthermore, one end of the notch 103 is connected to one end of the reinforcing section 104, and the other end of the notch 103 is connected to the other end of the reinforcing section 104, so that the notch 103 and the reinforcing section 104 are connected end to end along the circumference of the sub-valve body 1011, and the notch 103 and the reinforcing section 104 can form a closed shape. The structural strength of the reinforcing section 104 is designed to be greater than that of the notch 103, so that even if the notch 103 is stretched open, the reinforcing section 104 can maintain a reliable connection with the sub-valve body 1011, thus preventing the reinforcing section 104 from being stretched open and reducing the risk of the valve opening surface detaching from the valve body 101.

[0065] In some embodiments, the thickness of the reinforcing segment 104 may be greater than the thickness of the notch 103, so that the structural strength of the reinforcing segment 104 is greater than the structural strength of the notch 103.

[0066] In other embodiments, the width of the reinforcing segment 104 may be greater than the thickness of the notch 103, so that the structural strength of the reinforcing segment 104 is greater than the structural strength of the notch 103.

[0067] Specifically, the extension length of the reinforcing section 104 in the first direction is L. When L < 6mm, the upward height of the two sub-valve bodies 1011 is relatively too large, and there is still a potential problem of the valve opening surface breaking off and flying out of the valve body 101. When L > 15mm, the upward height of the sub-valve body 1011 is relatively too small, and the exhaust rate is greatly affected. Therefore, in this embodiment of the utility model, 6mm ≤ L ≤ 15mm is controlled. On the one hand, this helps to ensure the connection strength between the reinforcing section 104 and the sub-valve body 1011, which can reduce the potential problem of the valve opening surface breaking off and flying out of the valve body 101. On the other hand, it can also ensure that the upward height of the sub-valve body 1011 is moderate, which improves the reliability of exhaust.

[0068] For example, the extension length L of the reinforcing segment 104 in the first direction X can be 6mm, 8mm, 10mm, 11mm, 13mm or 15mm, etc.

[0069] In this embodiment of the utility model, the valve body 101 can be obtained by stamping the body strip, and the valve opening surface can be an inward-facing recessed platform.

[0070] In some alternative embodiments, such as Figure 2 As shown, the explosion-proof valve 10 includes a first protrusion 1021, which is connected to the support platform 102. The end of the first protrusion 1021 away from the support platform 102 can extend toward the back ion valve body 1011. In this way, when the groove 103 is opened and the valve opening surface is opened, the first protrusion 1021 can block the valve opening surface, so that the valve opening surface can be bent to further reduce the height of the valve opening surface.

[0071] Specifically, the number of first protrusions 1021 can be one or at least two, wherein at least two first protrusions 1021 can be respectively provided corresponding to two sub-valve bodies 1011 to block the upward tilting height of the two valve opening surfaces. The at least two first protrusions 1021 can be arranged at intervals along the extending direction of the support platform 102.

[0072] Specifically, the notch 103 and the reinforcing section 104 enclose and form a valve opening area. After the notch 103 is opened, the valve opening surface flips up, so that the valve opening area forms a pressure relief port.

[0073] Optionally, the sub-valve body 1011 has a mounting surface 10112, a notch 103 and a reinforcing section 104 surrounding the mounting surface 10112; along the third direction Z, the orthographic projection of the first protrusion 1021 at least partially falls within the mounting surface 10112, so that after the notch 103 is opened, it can be ensured that the end of the first protrusion 1021 away from the support platform 102 can block the valve opening surface and reduce the upward height of the valve opening surface.

[0074] In other alternative embodiments, such as Figure 3 As shown, the explosion-proof valve 10 includes a second protrusion 1041, which is connected to the reinforcing section 104. The end of the second protrusion 1041 away from the reinforcing section 104 extends toward the back ion valve body 1011. In this way, after the groove 103 is opened, the second protrusion 1041 can block the valve opening surface, allowing the valve opening surface to bend, thereby further reducing the height of the valve opening surface.

[0075] Specifically, the number of second protrusions 1041 can be one or at least two, wherein at least two second protrusions 1041 can be spaced apart along the extension direction of the reinforcing section 104.

[0076] Optionally, along the third direction Z, the orthographic projection of the second protrusion 1041 falls at least partially within the mounting surface 10112. In this way, after the groove 103 is opened, it can be ensured that the end of the second protrusion 1041 away from the reinforcing section 104 can block the valve opening surface and reduce the upward height of the valve opening surface.

[0077] In some alternative embodiments, such as Figure 4 As shown, the explosion-proof valve 10 includes a third protrusion 10111, which is connected to the sub-valve body 1011. The third protrusion 10111 is located on the side of the reinforcing section 104 away from the support platform 102. The end of the third protrusion 10111 away from the sub-valve body 1011 extends toward the support platform 102. In this way, after the groove 103 is opened, the third protrusion 10111 can abut against the support platform 102, which can block the valve opening surface, making the valve opening surface bend and the upward height lower.

[0078] Specifically, the number of third protrusions 10111 can be one or at least two, and at least two third protrusions 10111 can be spaced apart along the first direction X.

[0079] Optionally, the mounting surface 10112 and the third protrusion 10111 are located on the same side, and the extension direction of the third protrusion 10111 is set at an obtuse angle with the mounting surface 10112, so that one end of the third protrusion 10111 abuts against the support platform 102 and the other end blocks the valve opening surface, so that the valve opening surface is bent and the upward height is low.

[0080] In some alternative embodiments, the reinforcing segment 104 may be elongated and may extend along a first direction X.

[0081] In this embodiment of the utility model, the reinforcing section 104 can be arranged along the first direction X, so that the reinforcing section 104 can extend along the first direction X, and the side of the valve opening surface arranged along the second direction Y can be flipped up. Since the size of the valve opening surface in the second direction Y is less than half the size of the valve body 101 in the second direction Y, it is easy to ensure that the flipping height of the valve opening surface is low.

[0082] In some embodiments, the reinforcing section 104 can be disposed opposite to the middle region of the support platform 102 in the first direction X, so that the reinforcing section 104 is disposed in the middle position of the valve body 101, which can further reduce the upward height of the valve opening surface, and can enhance the strength support of the middle part of the valve body 101, thus preventing the explosion-proof valve 10 from deforming.

[0083] In other embodiments, the reinforcing segment 104 may also be located near the middle region of the support platform 102 in the first direction X.

[0084] In some alternative embodiments, such as Figure 5 As shown, along the second direction Y, the reinforcing section 104 is located on the side of the sub-valve body 1011 away from the support platform 102.

[0085] In this embodiment of the invention, when the internal pressure of the battery pack is high, the groove 103 is opened, the valve opening surface is opened, and the side of the valve opening surface connected to the support platform 102 is flipped up, which can improve the reliability of the smooth opening of the two valve opening surfaces, facilitate rapid venting, and achieve rapid pressure relief.

[0086] In some alternative embodiments, such as Figure 6 As shown, the reinforcing section 104 is arranged adjacent to the support platform 102.

[0087] In this embodiment of the utility model, when the internal pressure of the battery pack is high, the valve opening surface opens and the side of the valve opening surface away from the support platform 102 flips up, which makes it easier to ensure that the flipping height of the valve opening surface is low, and can effectively improve the space utilization of the battery cell 1 or the battery pack, while facilitating the venting of the battery cell 1 or the battery pack.

[0088] In some alternative embodiments, two sub-valve bodies 1011 are symmetrically distributed on both sides of the support platform 102 along the second direction Y.

[0089] In this embodiment of the invention, the two sub-valve bodies 1011 are symmetrically distributed along the second direction Y, which makes the explosion-proof valve 10 structurally strong and relatively stable.

[0090] In this embodiment of the utility model, since the sub-valve body 1011 is provided with a reinforcing section 104 and a notch 103, such as Figure 6 As shown, the reinforcing sections 104 on the sub-valve body 1011 are symmetrically distributed on both sides of the support platform 102 in the second direction Y.

[0091] In some alternative embodiments, the two sub-valve bodies 1011 can be a first sub-valve body 1011 and a second sub-valve body 1011, respectively. The reinforcing section 104 on the first sub-valve body 1011 can be arranged adjacent to the support platform 102, and the reinforcing section 104 on the second sub-valve body 1011 can be arranged away from the support platform 102 along the second direction Y.

[0092] In this embodiment of the invention, the reinforcing section 104 disposed on the first sub-valve body 1011 is the first reinforcing section 105, and the reinforcing section 104 disposed on the second sub-valve body 1011 is the second reinforcing section 106. That is, the reinforcing sections 104 disposed on the two sub-valve bodies 1011 are the first reinforcing section 105 and the second reinforcing section 106, respectively. The first reinforcing section 105 may be disposed adjacent to the support platform 102, and the second reinforcing section 106 may be disposed away from the support platform 102 along the second direction Y. That is, along the second direction Y, the second reinforcing section 106 is disposed on the side of the second sub-valve body 1011 away from the support platform 102.

[0093] In this embodiment of the utility model, the first reinforcing section 105 and the second reinforcing section 106 are asymmetrically arranged on both sides of the support platform 102 along the second direction Y. In this way, when the pressure inside the battery pack is large, after the groove 103 is opened, the two valve opening surfaces are flipped up and spaced apart, which helps to reduce the upward height of the valve opening surfaces and facilitates the venting of the cell 1 or the battery pack.

[0094] In this embodiment of the utility model, the arrangement of the first reinforcing section 105 and the second reinforcing section 106 relative to the support platform 102 is quite diverse.

[0095] In some embodiments, the third direction Z is perpendicular to the plane containing the first direction X and the second direction Y; along the third direction Z, the height of the support platform 102 is H1, the height of the reinforcing section 104 is H2, and the height of the sub-valve body 1011 at the position of the notch 103 is H3, where H3 < H2 ≤ H1.

[0096] In this embodiment, along the third direction Z, the height H2 of the reinforcing section 104 can be greater than the height H3 of the sub-valve body 1011 at the position of the notch 103. This ensures that the structural strength of the reinforcing section 104 is higher than the structural strength of the notch 103, thus guaranteeing a reliable connection between the reinforcing section 104 and the sub-valve body 1011 after the notch 103 is opened. The height H2 of the reinforcing section 104 is less than or equal to the height H1 of the support platform 102, allowing the reinforcing section 104 to maintain a relatively high height, which further helps to ensure the structural strength of the reinforcing section 104 and prevents the reinforcing section 104 from being opened.

[0097] Specifically, such as Figure 7 As shown, the third direction Z is the thickness direction of the explosion-proof valve 10. Along the third direction Z, the height H2 of the reinforcing section 104 can be equal to the height H1 of the support platform 102, or, along the third direction Z, the height H2 of the reinforcing section 104 can also be between the height H1 of the support platform 102 and the height H3 of the sub-valve body 1011 at the notch 103.

[0098] In some alternative embodiments, the grooves 103 and reinforcing sections 104 in the same sub-valve body 1011 enclose a closed shape, which may include at least one of a circle, an ellipse, a racetrack shape, a semicircle, a semi-ellipse, and a semi-racetrack shape, making the structure of the explosion-proof valve 10 more diverse.

[0099] Specifically, the shape of the valve opening area matches the shape of the closed pattern. For example... Figure 8 As shown, this illustrates a case where the closed shape is a circle, such as... Figure 1 As shown, this illustrates a case where the closed shape is runway-shaped.

[0100] Optionally, the battery cell 1 may include a top cover 30; a housing 40, the housing 40 and the top cover 30 being connected and enclosing to form a receiving cavity; a battery cell 1 body, the battery cell 1 body being disposed within the receiving cavity; a terminal post 20, the terminal post 20 being disposed on the top cover 30 and electrically connected to the battery cell 1 body; and an explosion-proof valve 10 being disposed on the top cover 30 or the housing 40.

[0101] In this embodiment of the invention, when the pressure inside the containment cavity rises abnormally, the explosion-proof valve 10 opens to quickly release the pressure in the containment cavity, preventing the battery cell 1 from exploding or catching fire, thus ensuring safety.

[0102] Specifically, when a large amount of gas (such as CO2, H2, CH4, etc. from electrolyte decomposition) is generated inside the battery cell 1 due to faults such as thermal runaway, overcharging, or short circuit, and the pressure exceeds the threshold, the groove 103 of the explosion-proof valve 10 will be pushed open or broken, and the valve opening surface will open to quickly release the internal pressure of the battery cell 1 and prevent the battery cell 1 housing 40 from rupturing due to high pressure expansion.

[0103] Specifically, the top cover 30 and the housing 40 form the external structure of the battery cell 1, used to install and protect the battery cell 1 body, the electrode post 20, and the explosion-proof valve 10. The battery cell 1 body is the main structure of the battery cell 1, and the electrode post 20 is a key component connecting the internal electrodes of the battery cell 1 with the external circuit, undertaking the dual functions of current conduction and mechanical fixation.

[0104] Specifically, the top cover 30 and the housing 40 can be made of metal, such as aluminum or aluminum alloy. The top cover 30 and the housing 40 can be fixed together by welding.

[0105] Specifically, the electrode post 20 may include a positive electrode post 20 and a negative electrode post 20. When the explosion-proof valve 10 is disposed on the top cover 30, the explosion-proof valve 10 may also be disposed between the positive electrode post 20 and the negative electrode post 20. Here, the first direction X may be the length direction or the width direction of the top cover 30, etc.

[0106] Specifically, when multiple battery cells 1 are grouped together, the battery cells 1 are placed close to each other, such as... Figure 9 As shown, the explosion-proof valves 10 of the battery cell 1 can all be installed on the top cover 30. After the explosion-proof valves 10 of adjacent battery cells 1 are opened, the gas inside the battery cell 1 diffuses into the battery pack. The exhaust device in the battery pack can quickly exhaust the gas to prevent the high-temperature gas from reigniting.

[0107] The battery cell described in this embodiment of the present invention has at least the following advantages:

[0108] In this embodiment of the utility model, the support platform divides the valve body into two sub-valve bodies, each of which is provided with grooves, so that there are two valve opening faces on the valve body. In this way, when the explosion-proof valve is opened, both valve opening faces are opened, so that the upward tilting height of each valve opening face is low, thereby ensuring that the explosion-proof valve can be opened normally and has a good pressure relief function. Since the reinforced section has a strong structural strength, it can also avoid the problem of the explosion-proof valve flying out.

[0109] Secondly, this utility model embodiment also discloses a battery pack, which may also include a plurality of the above-mentioned battery cells 1. The plurality of battery cells 1 may be stacked along a first direction X, such that the extension direction of the support platform 102 is the same as the stacking direction of the battery cells 1, or the plurality of battery cells 1 may be stacked along a second direction Y, such that the extension direction of the support platform 102 is perpendicular to the stacking direction of the battery cells 1.

[0110] Specifically, multiple battery cells 1 can be combined together in series or parallel to form a battery module. In this embodiment of the invention, after the explosion-proof valve 10 in the battery cell 1 is opened, the valve face flips up to a low height, which can avoid the problem of blocked exhaust. After the explosion-proof valves 10 of adjacent battery cells 1 are opened, they will not obstruct each other's exhaust.

[0111] In some embodiments, the battery pack may include a housing and battery modules disposed within the housing, and the explosion-proof valve 10 may be disposed within the housing of the battery pack so that the explosion-proof valve 10 can depressurize the battery pack.

[0112] The battery pack described in this embodiment of the present invention can achieve the same beneficial effects as the battery cell 1 described above, and will not be repeated here.

[0113] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0114] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0115] The present invention provides a detailed description of a battery cell and battery pack. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery cell (1), characterized in that, The battery cell (1) includes an explosion-proof valve (10), the explosion-proof valve (10) comprising: The valve body (101) includes a vertical first direction (X) and a second direction (Y); A support platform (102) is disposed on the valve body (101). The support platform (102) extends along the first direction (X) and divides the valve body (101) into two sub-valve bodies (1011) along the second direction (Y). The groove (103) and the reinforcing section (104) are arranged circumferentially along the sub-valve body (1011), and one end of the groove (103) is connected to one end of the reinforcing section (104), and the other end of the groove (103) is connected to the other end of the reinforcing section (104). The structural strength of the reinforcing section (104) is greater than that of the groove (103).

2. The battery cell (1) according to claim 1, characterized in that, The explosion-proof valve (10) includes a first protrusion (1021), which is connected to the support platform (102). The end of the first protrusion (1021) away from the support platform (102) extends in a direction away from the sub-valve body (1011). And / or, the explosion-proof valve (10) includes a second protrusion (1041) connected to the reinforcing section (104), and the end of the second protrusion (1041) away from the reinforcing section (104) extends in a direction away from the sub-valve body (1011); And / or, the explosion-proof valve (10) includes a third protrusion (10111) connected to the sub-valve body (1011), the third protrusion (10111) being located on the side of the reinforcing section (104) away from the support platform (102), and the end of the third protrusion (10111) away from the sub-valve body (1011) extending toward the support platform (102).

3. The battery cell (1) according to claim 2, characterized in that, The sub-valve body (1011) has a mounting surface (10112), and the groove (103) and the reinforcing section (104) are provided around the mounting surface (10112); Along the third direction (Z), the orthographic projection of the first protrusion (1021) falls at least partially within the mounting surface (10112), and the orthographic projection of the second protrusion (1041) falls at least partially within the mounting surface (10112); the third direction (Z), the first direction (X), and the second direction (Y) are perpendicular to each other; The extension direction of the third protrusion (10111) is set at an obtuse angle to the mounting surface (10112).

4. The battery cell (1) according to claim 1, characterized in that, The reinforcing segment (104) is elongated and extends along the first direction (X).

5. The battery cell (1) according to claim 4, characterized in that, Along the second direction (Y), the reinforcing section (104) is disposed on the side of the sub-valve body (1011) away from the support platform (102).

6. The battery cell (1) according to claim 4, characterized in that, The reinforcing section (104) is arranged adjacent to the support platform (102).

7. The battery cell (1) according to claim 5 or 6, characterized in that, The two sub-valve bodies (1011) are symmetrically distributed on both sides of the support platform (102) along the second direction (Y).

8. The battery cell (1) according to claim 4, characterized in that, The reinforcing sections (104) provided on the two sub-valve bodies (1011) are the first reinforcing section (105) and the second reinforcing section (106), respectively; The first reinforcing section (105) is disposed adjacent to the support platform (102); Along the second direction (Y), the second reinforcing section (106) is disposed on the side of the sub-valve body (1011) away from the support platform (102).

9. The battery cell (1) according to claim 1, characterized in that, The third direction (Z) is perpendicular to the plane containing the first direction (X) and the second direction (Y); Along the third direction (Z), the height of the support platform (102) is H1, the height of the reinforcing section (104) is H2, and the height of the sub-valve body (1011) at the position of the notch (103) is H3, where H3 < H2 ≤ H1.

10. The battery cell (1) according to claim 1, characterized in that, The length of the reinforcing segment (104) in the first direction (X) is L, where 6mm ≤ L ≤ 15mm.

11. The battery cell (1) according to claim 1, characterized in that, The groove (103) and the reinforcing section (104) in the same sub-valve body (1011) enclose a closed shape, the closed shape including at least one of a circle, an ellipse, a racetrack shape, a semicircle, a semi-ellipse, and a semi-racetrack shape.

12. The battery cell (1) according to claim 1, characterized in that, The battery cell (1) includes: Top cover (30); A housing (40) and a top cover (30) are connected and enclosed to form a receiving cavity; A battery cell body, wherein the battery cell body is disposed within the receiving cavity; A terminal post (20) is disposed on the top cover (30) and electrically connected to the battery cell body; The explosion-proof valve (10) is disposed on the top cover (30) or the housing (40).

13. A battery pack, characterized in that, It includes multiple battery cells (1) as described in any one of claims 1-12, wherein multiple battery cells (1) are stacked along the first direction (X), or multiple battery cells (1) are stacked along the second direction (Y).

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