Battery cell and battery pack with same

Abstract

The utility model discloses a battery monomer and a battery pack with the same, the battery monomer comprises a shell assembly, a pole group and an anti-explosion valve, and the pole group is arranged in the shell assembly; the explosion-proof valve comprises a first explosion-proof part and a second explosion-proof part, the first explosion-proof part and the second explosion-proof part are both arranged on the shell assembly, the second explosion-proof part is connected to the circumferential area of the first explosion-proof part, and the first explosion-proof part and the second explosion-proof part are arranged in a staggered mode in the first direction. And a third explosion-proof part is formed at the joint of the first explosion-proof part and the second explosion-proof part. According to the battery monomer disclosed by the utility model, the first explosion-proof part and the second explosion-proof part are arranged, and the first explosion-proof part and the second explosion-proof part are staggered in the first direction, so that the third explosion-proof part is formed at the joint of the first explosion-proof part and the second explosion-proof part, and the structure at the third explosion-proof part is thinned and is relatively weak in strength; therefore, the explosion-proof valve is easy to open, the comprehensive performance of the explosion-proof valve is improved, and finally the safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a battery monomer and a battery pack having the same. Background Art

[0002] With the rapid development of the new energy industry, batteries with high capacity, high cycle life and high safety performance have been widely used and developed. At the same time, there is an urgent need for batteries with larger capacity, longer durability and greater safety. As one of the core parts of the battery, the explosion-proof valve is one of the effective ways to ensure the high safety performance of the battery. Therefore, how to improve the performance of the explosion-proof valve and improve the safety performance of the battery has become an urgent problem to be solved. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell with high safety performance.

[0004] According to the battery cell of the embodiment of the utility model, it includes a shell assembly, a pole group and an explosion-proof valve, the pole group is arranged in the shell assembly; the explosion-proof valve includes: a first explosion-proof part and a second explosion-proof part, the first explosion-proof part and the second explosion-proof part are both arranged on the shell assembly, and the second explosion-proof part is connected to the circumferential area of ​​the first explosion-proof part, the first explosion-proof part and the second explosion-proof part are staggered in the first direction to form a third explosion-proof part at the connection between the first explosion-proof part and the second explosion-proof part.

[0005] According to the battery cell of the embodiment of the utility model, a first explosion-proof part and a second explosion-proof part are provided, and the first explosion-proof part and the second explosion-proof part are staggered in the first direction, so that a third explosion-proof part is formed at the connection between the first explosion-proof part and the second explosion-proof part, so that the structure at the third explosion-proof part becomes thinner and has weaker strength, thereby making it easy to open the explosion-proof valve, improving the comprehensive performance of the explosion-proof valve, and ultimately improving the safety performance of the battery.

[0006] In some embodiments of the utility model, the shell assembly includes a shell body and a cover plate, a receiving cavity is provided inside the shell body, an opening is provided at one end of the receiving cavity along the first direction, and the pole group is installed in the receiving cavity through the opening; the cover plate is covered at the opening and connected to the shell body, and the first explosion-proof part and the second explosion-proof part are integrally stamped on the cover plate.

[0007] In some embodiments of the present invention, the thickness of the first explosion-proof part in the first direction is L1, the thickness of the second explosion-proof part in the first direction is L2, and the thickness of the third explosion-proof part is L3, satisfying: L1>L3; L2>L3.

[0008] In some embodiments of the utility model, a positioning portion is provided on one end of the shell body facing the cover plate; a positioning groove is opened on the side of the cover plate facing the accommodating cavity; and the cover plate is connected to the shell body through the cooperation of the positioning groove and the positioning portion.

[0009] In some embodiments of the present invention, a height of the positioning portion in the first direction is H1, and a depth of the positioning groove in the first direction is H2, satisfying: H1≤H2.

[0010] In some embodiments of the present invention, the thickness of the cover plate in the first direction is H3, satisfying: 0.4≤H2 / H3≤0.8; 1.4≤H3≤3.2.

[0011] In some embodiments of the present invention, the dimension of the positioning portion in the second direction is W1, and the dimension of the positioning groove in the second direction is W2, satisfying: 1≤W1 / W2≤1.2; the first direction is perpendicular to the second direction.

[0012] In some embodiments of the present invention, the shell body has a bottom wall and a side wall connected to each other, the bottom wall and the side wall enclose a receiving cavity, and the positioning portion is arranged at the top of the side wall; the thickness of the side wall is W3, satisfying: 0.5≤W1 / W3≤0.8; 0.35≤W3≤1.2.

[0013] In some embodiments of the present invention, the electrode group has a positive electrode ear and a negative electrode ear, and the battery cell also includes: a positive electrode column and a negative electrode column, the positive electrode column and the negative electrode column are both arranged on the cover plate, and the positive electrode column is electrically connected to the positive electrode ear, and the negative electrode column is electrically connected to the negative electrode ear.

[0014] A battery pack according to an embodiment of the present invention comprises a housing and the above-mentioned battery cell, wherein the battery cell is arranged in the housing.

[0015] According to the battery pack of the embodiment of the utility model, a first explosion-proof part and a second explosion-proof part are provided, and the first explosion-proof part and the second explosion-proof part are staggered in the first direction to form a third explosion-proof part at the connection between the first explosion-proof part and the second explosion-proof part, so that the structure at the third explosion-proof part becomes thinner and has weaker strength, thereby making it easy to open the explosion-proof valve, improving the comprehensive performance of the explosion-proof valve, and ultimately improving the safety performance of the battery.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a cross-sectional view of a battery cell according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 yes Figure 1 The enlarged view of point B in the middle;

[0021] Figure 4 is a cross-sectional view of a cover plate of a battery cell according to an embodiment of the utility model;

[0022] Figure 5 yes Figure 4 Enlarged view of point C in the middle;

[0023] Figure 6 yes Figure 4 The enlarged view of point D in the middle;

[0024] Figure 7 is a cross-sectional view of a housing body of a battery cell according to an embodiment of the utility model;

[0025] Figure 8 yes Figure 7 Enlarged view of point E in the middle;

[0026] Fig. 9 is a three-dimensional diagram of a battery cell according to an embodiment of the utility model;

[0027] Fig.10 It is a top view of a battery cell according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] 100. Battery cell;

[0030] 110, housing assembly; 111, housing body; 1111, receiving cavity; 1112, positioning portion; 1113, side wall; 1114, bottom wall; 112, cover plate; 1121, positioning groove;

[0031] 120, electrode group; 121, positive electrode ear; 122, negative electrode ear;

[0032] 130, explosion-proof valve; 131, first explosion-proof part; 132, second explosion-proof part; 133, third explosion-proof part;

[0033] 140, positive pole;

[0034] 150. Negative pole. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] At present, the existing batteries all use V-shaped or U-shaped explosion-proof notches, and the explosion-proof notches are stamped and formed integrally with the cover plate. However, the flow and extrusion of the material during stamping may cause the outer nickel plating layer to fall off, which poses a corrosion risk, and the product consistency is difficult to control, which leads to poor performance of the explosion-proof notches. Secondly, the cover plate and the shell body in the existing battery are clearance-matched, and external equipment is required for precise positioning and assembly. There is no precise positioning and matching structure between the two, which increases the cumulative error and reduces the battery yield. The disadvantages outweigh the advantages.

[0039] Reference below Figure 1-Figure 10 A battery cell 100 according to an embodiment of the present invention is described.

[0040] The battery cell 100 according to the embodiment of the present invention includes a housing assembly 110, a pole group 120 and an explosion-proof valve 130.

[0041] The battery cell 100 may be a lithium secondary battery, or a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto.

[0042] The battery cell 100 may be cylindrical, flat, rectangular or other shapes.

[0043] Specifically, Figure 1 and Fig.10 As shown, the battery cell 100 may include a shell assembly 110, an electrode group 120 and an explosion-proof valve 130. The electrode group 120 is disposed in the shell assembly 110. The shell assembly 110 can protect the electrode group 120 and reduce the risk of the electrode group 120 being subjected to external force impact.

[0044] like Figure 1 and Figure 2 As shown, the explosion-proof valve 130 includes a first explosion-proof portion 131 and a second explosion-proof portion 132. The first explosion-proof portion 131 and the second explosion-proof portion 132 are both disposed on the housing assembly 110, and the second explosion-proof portion 132 is connected to the circumferential region of the first explosion-proof portion 131. The first explosion-proof portion 131 and the second explosion-proof portion 132 are in a first direction (such as Figure 1 The explosion-proof valve 130 is staggered in the direction a shown in the figure, so as to form a third explosion-proof part 133 at the connection between the first explosion-proof part 131 and the second explosion-proof part 132, so that the structure at the third explosion-proof part 133 becomes thinner and weaker, so that the explosion-proof valve 130 is easy to open, the comprehensive performance of the explosion-proof valve 130 is improved, and finally the safety performance of the battery is improved. Therefore, when thermal expansion occurs inside the battery cell 100, the internal air pressure can break through the position of the third explosion-proof part 133, so as to facilitate exhaust.

[0045] According to the battery cell 100 of the embodiment of the utility model, the first explosion-proof part 131 and the second explosion-proof part 132 are provided, and the first explosion-proof part 131 and the second explosion-proof part 132 are staggered in the first direction to form a third explosion-proof part 133 at the connection between the first explosion-proof part 131 and the second explosion-proof part 132, so that the structure at the third explosion-proof part 133 becomes thinner and has weaker strength, so that the explosion-proof valve 130 is easy to open, the comprehensive performance of the explosion-proof valve 130 is improved, and finally the safety performance of the battery is improved.

[0046] In some embodiments of the present invention, Figure 1 , Figure 7 and Fig. 9As shown, the shell assembly 110 includes a shell body 111 and a cover plate 112. A receiving cavity 1111 is provided inside the shell body 111. An opening is provided at one end of the receiving cavity 1111 along the first direction. The pole group 120 is installed in the receiving cavity 1111 through the opening; the cover plate 112 covers the opening and is connected to the shell body 111. The first explosion-proof part 131 and the second explosion-proof part 132 are integrally stamped and formed on the cover plate 112.

[0047] It is understandable that in the present invention, the first explosion-proof part 131 and the second explosion-proof part 132 are integrally stamped and formed with the cover plate 112, and there is no need to process and assemble the explosion-proof valve 130, so as to improve the processing efficiency of the explosion-proof valve 130 and thus improve the overall assembly efficiency of the battery.

[0048] It should be understood that the first explosion-proof portion 131 and the second explosion-proof portion 132 in the present invention are not limited to being integrally stamped and formed on the cover plate 112 , but can also be integrally stamped and formed on the shell body 111 as long as the effect of the present invention is not affected.

[0049] At the same time, the first explosion-proof part 131 and the second explosion-proof part 132 are not limited to being stamped integrally with the cover plate 112. Other processing methods, for example, the first explosion-proof part 131 and the second explosion-proof part 132 are arranged in staggered layers and welded to the cover plate 112, but not limited to this, can also achieve the function of the explosion-proof valve 130 in the utility model and should also be regarded as an embodiment of the utility model.

[0050] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the thickness of the first explosion-proof part 131 in the first direction is L1, the thickness of the second explosion-proof part 132 in the first direction is L2, and the thickness of the third explosion-proof part 133 is L3, satisfying: L1>L3; L2>L3.

[0051] That is, the thickness of the third explosion-proof portion 133 is smaller than both the thickness of the first explosion-proof portion 131 in the first direction and the thickness of the second explosion-proof portion 132 in the first direction.

[0052] The thickness L1 of the first explosion-proof part 131 in the first direction can be obtained by measuring the thickness of the first explosion-proof part 131 at different positions on the cover plate 112 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0053] The thickness L2 of the second explosion-proof portion 132 in the first direction can be obtained by measuring the thickness of the second explosion-proof portion 132 at different positions on the cover plate 112 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0054] The thickness L3 of the third explosion-proof portion 133 can be obtained by measuring the thickness of the third explosion-proof portion 133 at different positions on the cover plate 112 by a measuring tool for multiple times and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0055] It can be understood that the utility model controls the thickness of the third explosion-proof part 133 to be smaller than the thickness of the first explosion-proof part 131, and at the same time controls the thickness of the third explosion-proof part 133 to be smaller than the thickness of the second explosion-proof part 132, so as to ensure that the third explosion-proof part 133 has a smaller strength than the first explosion-proof part 131 and the second explosion-proof part 132, thereby ensuring the normal use of the third explosion-proof part 133, thereby improving the comprehensive performance of the explosion-proof valve 130, and ultimately improving the safety performance of the battery.

[0056] In a preferred embodiment, the thickness L1 of the first explosion-proof part 131 in the first direction and the thickness L3 of the third explosion-proof part 133 also satisfy: 0.5≤L3 / L1<1. That is, the ratio of the thickness L3 of the third explosion-proof part 133 to the thickness L1 of the first explosion-proof part 131 in the first direction can be controlled within the range of 0.5-1. For example, the ratio of the thickness L3 of the third explosion-proof part 133 to the thickness L1 of the first explosion-proof part 131 in the first direction can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical value of the ratio is only given by way of example, and any value within the range of 0.5-1 is within the protection scope of the present utility model.

[0057] It can be understood that when L3 / L1 is less than 0.5, that is, the thickness L3 of the third explosion-proof part 133 is too small, and the strength of the third explosion-proof part 133 is too low, resulting in that the explosion-proof valve 130 can be opened even when the internal air pressure of the battery cell 100 is too low, and the performance is poor; when L3 / L1 is greater than 1, that is, the thickness L3 of the third explosion-proof part 133 is too large, and the strength of the third explosion-proof part 133 is too strong, the explosion-proof valve 130 is not easy to open, and the performance is poor.

[0058] In the present invention, the ratio of the thickness L3 of the third explosion-proof part 133 to the thickness L1 of the first explosion-proof part 131 in the first direction is controlled within the range of 0.5-1, so that the thickness of the third explosion-proof part 133 is reasonably designed according to the thickness of the first explosion-proof part 131, and the function of the third explosion-proof part 133 is ensured while the third explosion-proof part 133 has a certain strength, thereby improving the comprehensive performance of the explosion-proof valve 130 and ultimately improving the safety performance of the battery.

[0059] Further, the thickness L2 of the second explosion-proof part 132 in the first direction and the thickness L3 of the third explosion-proof part 133 also satisfy: 0.5≤L3 / L2<1. That is, the ratio of the thickness L3 of the third explosion-proof part 133 to the thickness L2 of the second explosion-proof part 132 in the first direction can be controlled within the range of 0.5-1. For example, the ratio of the thickness L3 of the third explosion-proof part 133 to the thickness L2 of the second explosion-proof part 132 in the first direction can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical value of the ratio is only given by way of example, and any value within the range of 0.5-1 is within the protection scope of the present utility model.

[0060] It can be understood that when L3 / L2 is less than 0.5, that is, the thickness L3 of the third explosion-proof part 133 is too small, and the strength of the third explosion-proof part 133 is too low, resulting in that the explosion-proof valve 130 can be opened even when the internal air pressure of the battery cell 100 is too low, and the performance is poor; when L3 / L2 is greater than 1, that is, the thickness L3 of the third explosion-proof part 133 is too large, and the strength of the third explosion-proof part 133 is too strong, the explosion-proof valve 130 is not easy to open, and the performance is poor.

[0061] In the present invention, the ratio of the thickness L3 of the third explosion-proof part 133 to the thickness L2 of the second explosion-proof part 132 in the first direction is controlled within the range of 0.5-1, so as to further reasonably design the thickness of the third explosion-proof part 133 according to the thickness of the second explosion-proof part 132, ensure the function of the third explosion-proof part 133 while making the third explosion-proof part 133 have a certain strength, further improve the comprehensive performance of the explosion-proof valve 130, and finally improve the safety performance of the battery.

[0062] In some embodiments of the present invention, Figure 3 , Figure 4 and Figure 6 As shown, a positioning portion 1112 is provided on one end of the shell body 111 facing the cover plate 112; a positioning groove 1121 is provided on the side of the cover plate 112 facing the accommodating cavity 1111; the cover plate 112 is connected to the shell body 111 through the cooperation of the positioning groove 1121 and the positioning portion 1112, so as to facilitate the connection and positioning between the shell body 111 and the cover plate 112.

[0063] The positioning groove 1121 and the positioning portion 1112 may both be in any one of a cone, a cube or a sphere, but the present invention is not limited thereto.

[0064] It can be understood that in the present invention, by setting the positioning groove 1121 and the positioning portion 1112, the positioning groove 1121 and the positioning portion 1112 cooperate to achieve precise positioning between the cover plate 112 and the shell body 111, thereby achieving rapid installation of the cover plate 112 and improving the overall production efficiency and product yield of the battery.

[0065] In some embodiments of the present invention, the height of the positioning portion 1112 in the first direction is H1, and the depth of the positioning groove 1121 in the first direction is H2, satisfying: H1≤H2.

[0066] In the embodiments of the present invention, referring to Figure 6 and Figure 8 , the height of the positioning portion 1112 in the first direction is H1, and the depth of the positioning groove 1121 in the first direction is H2, satisfying: H1≤H2; that is, the height H1 of the positioning portion 1112 in the first direction is not greater than the depth H2 of the positioning groove 1121 in the first direction.

[0067] The height H1 of the positioning portion 1112 in the first direction can be obtained by measuring the heights of the positioning portion 1112 at different positions on the housing body 111 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0068] The depth H2 of the positioning groove 1121 in the first direction can be obtained by measuring the depths of the positioning groove 1121 at different positions on the cover plate 112 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0069] It can be understood that the utility model controls the height H1 of the positioning portion 1112 in the first direction to be not greater than the depth H2 of the positioning groove 1121 in the first direction, so as to take into account the quick connection and positioning between the cover plate 112 and the shell body 111 while ensuring the connection reliability between the cover plate 112 and the shell body 111, thereby ensuring that the cover plate 112 and the shell body 111 are tightly fitted.

[0070] In a preferred embodiment, the height H1 of the positioning portion 1112 in the first direction and the depth H2 of the positioning groove 1121 in the first direction also satisfy: 0.5≤H1 / H2≤1. That is, the ratio of the height H1 of the positioning portion 1112 in the first direction to the depth H2 of the positioning groove 1121 in the first direction can be controlled within the range of 0.5-1. For example, the ratio of the height H1 of the positioning portion 1112 in the first direction to the depth H2 of the positioning groove 1121 in the first direction can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1 or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical values ​​of the ratio are only given as examples, and any value within the range of 0.5-1 is within the protection scope of the present utility model.

[0071] It can be understood that when the value of H1 / H2 is less than 0.5, the protruding height of the positioning portion 1112 is too small, and the cover 112 and the shell body 111 cannot be reliably connected. When the value of H1 / H2 is greater than 1, the protruding height of the positioning portion 1112 is too large, that is, after the positioning portion 1112 is inserted into the positioning groove 1121, part of it is still exposed, which will cause a distance between the cover 112 and the shell body 111, and the cover 112 cannot be tightly covered on the shell body 111.

[0072] In the utility model, by controlling the ratio between the height H1 of the positioning portion 1112 in the first direction and the depth H2 of the positioning groove 1121 in the first direction within the range of 0.5-1, it is possible to further take into account the quick connection and positioning between the cover plate 112 and the shell body 111 while ensuring the connection reliability between the cover plate 112 and the shell body 111, thereby ensuring that the cover plate 112 and the shell body 111 fit closely.

[0073] In some embodiments of the present invention, Figure 6 and Figure 8 As shown, the thickness of the cover plate 112 in the first direction is H3, which satisfies: 0.4≤H2 / H3≤0.8; 1.4≤H3≤3.2. That is, the ratio of the depth H2 of the positioning groove 1121 in the first direction to the thickness H3 of the cover plate 112 in the first direction can be controlled within the range of 0.4-0.8. For example, the ratio of the depth H2 of the positioning groove 1121 in the first direction to the thickness H3 of the cover plate 112 in the first direction can be one of 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical values ​​of the ratio are only given as examples, and any value within the range of 0.4-0.8 is within the protection scope of the present utility model.

[0074] The thickness H3 of the cover plate 112 in the first direction can be obtained by measuring the thickness of different positions on the housing body 111 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0075] It can be understood that when the value of H2 / H3 is less than 0.4, that is, the depth of the positioning groove 1121 is small, the cover plate 112 and the shell body 111 cannot be reliably connected; when the value of H2 / H3 is greater than 0.8, that is, the depth of the positioning groove 1121 is too deep, it is easy to cause the strength of the cover plate 112 at the positioning groove 1121 to be too low and easy to be damaged.

[0076] In the present invention, H2 / H3 is controlled within the range of 0.4-0.8 to ensure that the depth of the positioning groove 1121 is in a reasonable design, so as to further take into account the quick connection and positioning between the cover plate 112 and the shell body 111, while also ensuring the connection reliability between the cover plate 112 and the shell body 111, thereby ensuring that the cover plate 112 and the shell body 111 fit closely.

[0077] Furthermore, the thickness H3 of the cover plate 112 in the first direction also satisfies: 1.4mm≤H3≤3.2mm. That is, the thickness H3 of the cover plate 112 in the first direction can be controlled within the range of 1.4mm-3.2mm. For example, the thickness H3 of the cover plate 112 in the first direction can be one of 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical values ​​of the thickness H3 are only given as examples, and any value within the range of 1.4mm-3.2mm is within the protection scope of the present utility model. The present utility model controls the thickness H3 of the cover plate 112 in the first direction within the range of 1.4mm-3.2mm to ensure that the cover plate 112 has sufficient strength while designing the cover plate 112 to be thin and light, thereby saving costs.

[0078] In some embodiments of the present invention, Figure 6 and Figure 8 As shown, the positioning portion 1112 is in the second direction (eg Figure 1The dimension in the direction b) shown in the figure is W1, and the dimension of the positioning groove 1121 in the second direction is W2, which satisfies: 1≤W1 / W2≤1.2; the first direction is perpendicular to the second direction. That is, the ratio of the dimension W1 of the positioning portion 1112 in the second direction to the dimension W2 of the positioning groove 1121 in the second direction can be controlled within the range of 1-1.2. For example, the ratio of the dimension W1 of the positioning portion 1112 in the second direction to the dimension W2 of the positioning groove 1121 in the second direction can be 1, 1.02, 1.04, 1.06, 1.08, 1.1, 1.12, 1.14, 1.16, 1.18, 2, or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical values ​​of the ratio are only given as examples, and any value within the range of 1-1.2 is within the protection scope of the present utility model.

[0079] It can be understood that the battery cell 100 has a first direction and a second direction that are perpendicular to each other.

[0080] The first direction may be the length direction of the battery cell 100, the width direction of the battery cell 100, or the height direction of the battery cell 100, but is not limited thereto. Preferably, in the present invention, the first direction is the height direction of the battery cell 100, and the second direction is the height direction of the battery cell 100.

[0081] Here, “vertical” refers to a state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89°-91°.

[0082] The dimension W1 of the positioning portion 1112 in the second direction can be obtained by measuring the dimensions of the positioning portion 1112 at different positions in the second direction on the housing body 111 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0083] The dimension W2 of the positioning groove 1121 in the second direction can be obtained by measuring the dimensions of the positioning groove 1121 at different positions in the second direction on the cover plate 112 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0084] It can be understood that when W1 / W2=1, that is, the size of the positioning portion 1112 in the second direction is not equal to the size of the positioning groove 1121 in the second direction, so that when the positioning portion 1112 is accommodated in the positioning groove 1121, the two are in a transition fit, which is convenient for installation; when 1<W1 / W2≤1.2, that is, the size of the positioning portion 1112 in the second direction is larger than the size of the positioning groove 1121 in the second direction, so that when the positioning portion 1112 is accommodated in the positioning groove 1121, the two are in an interference fit. At this time, optionally, the positioning portion 1112 and the positioning groove 1121 are riveted, so that the cover plate 112 and the shell body 111 are firmly assembled when assembled through the positioning portion 1112 and the positioning groove 1121, thereby improving the safety of the battery.

[0085] In other embodiments, after the positioning portion 1112 is nested in the positioning groove 1121 , the cover plate 112 and the shell body 111 may be further fixedly connected by laser welding, mutual riveting, or the like.

[0086] In some embodiments of the present invention, Figure 7 As shown, the shell body 111 has a bottom wall 1114 and a side wall 1113 connected to each other, and the bottom wall 1114 and the side wall 1113 enclose a receiving cavity 1111, and the positioning portion 1112 is arranged at the top of the side wall 1113; the thickness of the side wall 1113 is W3, which satisfies: 0.5≤W1 / W3≤0.8; 0.35≤W3≤1.2. That is, the ratio of the dimension W1 of the positioning portion 1112 in the second direction to the thickness W3 of the side wall 1113 can be controlled within the range of 0.5-0.8. For example, the ratio of the dimension W1 of the positioning portion 1112 in the second direction to the thickness W3 of the side wall 1113 can be one of 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or a range consisting of any two of them. It is worth noting that the above specific numerical value of the ratio is given only as an example, and any value within the range of 0.5-0.8 is within the protection scope of the present utility model.

[0087] The thickness W3 of the side wall 1113 can be obtained by measuring the thickness of different positions of the side wall 1113 on the housing body 111 multiple times with a measuring tool and calculating the average value. The measuring tool can be any one of a ruler, a vernier caliper or other dimension measuring instruments.

[0088] It can be understood that when the value of W1 / W3 is less than 0.5, that is, the size of the positioning portion 1112 in the second direction is small, the strength of the positioning portion 1112 is small, and the cover 112 and the shell body 111 cannot be reliably connected; when the value of W1 / W3 is greater than 0.8, that is, the size of the positioning portion 1112 in the second direction is large, it is easy to make it difficult to accurately position and assemble the cover 112 and the shell body 111.

[0089] In the utility model, W1 / W3 is controlled within the range of 0.5-0.8 to ensure that the size of the positioning portion 1112 in the second direction is reasonably designed, so as to further take into account the quick connection and positioning between the cover plate 112 and the shell body 111 while ensuring the connection reliability between the cover plate 112 and the shell body 111, thereby ensuring that the cover plate 112 and the shell body 111 are tightly matched.

[0090] Furthermore, the thickness W3 of the side wall 1113 also satisfies: 0.35mm≤W3≤1.2mm. That is, the thickness W3 of the side wall 1113 can be controlled within the range of 0.35mm-1.2mm. For example, the thickness W3 of the side wall 1113 can be one of 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm or a range consisting of any two of them. It is worth noting that the above-mentioned specific numerical values ​​of the thickness W3 are only given as examples, and any value within the range of 0.35mm-1.2mm is within the protection scope of the present utility model. The present utility model ensures that the side wall 1113 has sufficient strength by controlling the thickness W3 of the side wall 1113 within the range of 0.35mm-1.2mm, thereby ensuring that the shell body 111 has sufficient strength and improving the safety performance of the battery.

[0091] In some embodiments of the present invention, Figure 1 As shown, the electrode group 120 has a positive electrode ear 121 and a negative electrode ear 122 , and the battery cell 100 also includes: a positive electrode column 140 and a negative electrode column 150 , both of which are disposed on the cover plate 112 , and the positive electrode column 140 is electrically connected to the positive electrode ear 121 , and the negative electrode column 150 is electrically connected to the negative electrode ear 122 .

[0092] Specifically, the electrode group 120 is a component of the battery cell 100 where an electrochemical reaction occurs, and the electrode group 120 may be one or more. The electrode group 120 is mainly formed by stacking or winding a positive electrode sheet, a separator, and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode group 120, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. During the charge and discharge process of the battery cell 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear is connected to the pole column to form a current loop.

[0093] The battery pack according to the embodiment of the present invention comprises a housing and the above-mentioned battery cell 100 , wherein the battery cell 100 is disposed in the housing.

[0094] According to the battery pack of the embodiment of the utility model, the first explosion-proof part 131 and the second explosion-proof part 132 are provided, and the first explosion-proof part 131 and the second explosion-proof part 132 are staggered in the first direction to form a third explosion-proof part 133 at the connection between the first explosion-proof part 131 and the second explosion-proof part 132, so that the structure at the third explosion-proof part 133 becomes thinner and has weaker strength, so that the explosion-proof valve 130 is easy to open, the comprehensive performance of the explosion-proof valve 130 is improved, and finally the safety performance of the battery is improved.

[0095] Other structures and operations of the battery cell 100 and the battery pack having the same according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0096] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0097] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Shell assembly; A pole group, the pole group is arranged in the housing assembly; An explosion-proof valve, the explosion-proof valve comprising: a first explosion-proof part and a second explosion-proof part, the first explosion-proof part and the second explosion-proof part are both arranged on the shell assembly, and the second explosion-proof part is connected to the circumferential area of ​​the first explosion-proof part, the first explosion-proof part and the second explosion-proof part are staggered in a first direction to form a third explosion-proof part at the connection between the first explosion-proof part and the second explosion-proof part.

2. The battery cell according to claim 1, characterized in that: The housing assembly comprises: A shell body, wherein a receiving cavity is provided inside the shell body, an opening is provided at one end of the receiving cavity along the first direction, and the pole group is installed in the receiving cavity through the opening; A cover plate is provided to cover the opening and is connected to the shell body, and the first explosion-proof part and the second explosion-proof part are integrally stamped and formed on the cover plate.

3. The battery cell according to claim 1, characterized in that: The thickness of the first explosion-proof part in the first direction is L1, the thickness of the second explosion-proof part in the first direction is L2, and the thickness of the third explosion-proof part is L3, which satisfies: L1>L3; L2>L3.

4. The battery cell according to claim 2, characterized in that: A positioning portion is provided on one end of the shell body facing the cover plate; A positioning groove is formed on one side of the cover plate facing the receiving cavity; The cover plate is connected to the shell body through the cooperation of the positioning groove and the positioning portion.

5. The battery cell according to claim 4, characterized in that: The height of the positioning portion in the first direction is H1, and the depth of the positioning groove in the first direction is H2, satisfying: H1≤H2.

6. The battery cell according to claim 5, characterized in that: The thickness of the cover plate in the first direction is H3, which satisfies: 0.4≤H2 / H3≤0.8; 1.4≤H3≤3.

2.

7. The battery cell according to claim 4, characterized in that: The dimension of the positioning portion in the second direction is W1, and the dimension of the positioning groove in the second direction is W2, which satisfies: 1≤W1 / W2≤1.2; and the first direction is perpendicular to the second direction.

8. The battery cell according to claim 7, characterized in that: The shell body has a bottom wall and a side wall connected to each other, the bottom wall and the side wall are enclosed to form a receiving cavity, and the positioning portion is arranged at the top end of the side wall; The thickness of the side wall is W3, which satisfies: 0.5≤W1 / W3≤0.8; 0.35≤W3≤1.

2.

9. The battery cell according to claim 2, characterized in that: The electrode group has a positive electrode ear and a negative electrode ear, The battery cell further includes: a positive electrode column and a negative electrode column, wherein the positive electrode column and the negative electrode column are both disposed on the cover plate, and the positive electrode column is electrically connected to the positive electrode tab, and the negative electrode column is electrically connected to the negative electrode tab.

10. A battery pack, characterized in that: include: shell; The battery cell according to any one of claims 1 to 9, wherein the battery cell is disposed in the housing.

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