Battery cells and battery modules

Abstract

The embodiment of the present application discloses a battery cell and a battery module, wherein the battery cell has a first direction, including: a shell, provided with an open accommodation cavity, and the shell is provided with two side walls arranged opposite to each other in the first direction; an electrode assembly, accommodated in the accommodation cavity; an explosion-proof valve, provided on at least one of the two side walls; and an electrical connection unit, the electrical connection unit is electrically connected to the electrode assembly, and at least part of the electrical connection unit is provided between the side wall provided with the explosion-proof valve and the electrode assembly, so that an exhaust channel is formed between the side wall and the electrode assembly. According to the present application, it improves the safety performance of the battery, and ultimately improves the comprehensive performance of the battery; at the same time, it reduces the use of components in the battery, improves the assembly efficiency of the battery, and reduces the production cost of the battery.

Description

Technical Field

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

[0002] With the rapid development of the new energy industry, new energy vehicles are gradually replacing traditional fuel vehicles. High-performance lithium-ion power batteries with high energy density, high safety and long life are widely used in pure electric vehicles (BEV), hybrid electric vehicles (PHEV, HEV) and energy storage batteries. Lithium-ion batteries with high energy density, high cycle life and high safety performance have been widely used and developed. The demand for lithium-ion batteries with larger capacity, more durability and greater safety is very urgent. Therefore, how to improve the safety performance of batteries and then improve the comprehensive performance of batteries has become an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a battery cell and a battery module to improve the safety performance of the battery and ultimately improve the overall performance of the battery.

[0004] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In one aspect, a battery cell is provided, having a first direction, comprising:

[0006] A housing is provided with an open accommodating cavity, and the housing is provided with two side walls arranged opposite to each other in the first direction;

[0007] An electrode assembly is accommodated in the accommodating cavity;

[0008] an explosion-proof valve, disposed on at least one of the two side walls; and

[0009] An electrical connection unit is electrically connected to the electrode assembly, and at least a portion of the electrical connection unit is disposed between the side wall where the explosion-proof valve is arranged and the electrode assembly, so that an exhaust channel is formed between the side wall and the electrode assembly.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the battery cell further has a second direction intersecting the first direction, and the housing is provided with a first end and a second end arranged oppositely in the second direction;

[0011] The electrical connection unit includes: a first electrical connection member, the first electrical connection member is disposed at the first end, and at least a portion of the first electrical connection member is disposed between the side wall where the explosion-proof valve is arranged and the electrode assembly; and

[0012] A second electrical connector is disposed at the second end, and at least a portion of the second electrical connector is disposed between the side wall where the explosion-proof valve is arranged and the electrode assembly.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the first electrical connector includes: a first vent portion disposed at the first end;

[0014] The second electrical connector includes: a second exhaust portion disposed at the second end;

[0015] The first exhaust portion and the second exhaust portion are both disposed between the side wall on which the explosion-proof valve is arranged and the electrode assembly, so that an exhaust passage is formed between the side wall and the electrode assembly.

[0016] In addition to or as an alternative to one or more of the features disclosed above, the electrode assembly includes: an electrode body, a first pole ear and a second pole ear, wherein the first pole ear and the second pole ear are both connected to the electrode body, and the first pole ear and the second pole ear are both arranged close to the side wall where the explosion-proof valve is arranged;

[0017] The first electrode tab is electrically connected to the first exhaust portion, and the second electrode tab is electrically connected to the second exhaust portion.

[0018] In addition to or as an alternative to one or more of the features disclosed above, a first exhaust hole is formed on the first exhaust portion, and the first exhaust hole is in fluid communication with the exhaust channel;

[0019] The second exhaust portion is provided with a second exhaust hole, and the second exhaust hole is in fluid communication with the exhaust channel.

[0020] In addition to or as an alternative to one or more of the features disclosed above, the battery cell further includes: a first cover plate, covering the opening of the first end of the shell and connected to the shell, a first pole is arranged on the first cover plate, at least part of the first electrical connector is arranged between the first cover plate and the electrode assembly, and the first electrical connector is electrically connected to the first pole; and

[0021] A second cover plate covers the opening of the second end of the shell and is connected to the shell. A second pole is arranged on the second cover plate. At least part of the second electrical connector is arranged between the second cover plate and the electrode assembly, and the second electrical connector is electrically connected to the second pole.

[0022] In addition to or as an alternative to one or more of the features disclosed above, the first electrical connector further includes: a first electrical connection portion, the first electrical connection portion and the first exhaust portion are integrally formed, the first electrical connection portion is disposed between the first cover plate and the electrode assembly, and the first electrical connection portion is electrically connected to the first pole;

[0023] The second electrical connector also includes: a second electrical connection portion, the second electrical connection portion is integrally formed with the second exhaust portion, the second electrical connection portion is arranged between the second cover plate and the electrode assembly, and the second electrical connection portion is electrically connected to the second pole.

[0024] In addition to or as an alternative to one or more of the features disclosed above, a first welding area is provided on the first electrical connection portion, and the first pole is welded to the first welding area;

[0025] The second electrical connection portion is provided with a second welding area, and the second pole is welded to the second welding area.

[0026] In addition to or as an alternative to one or more of the features disclosed above, the explosion-proof valve is welded to the middle area of ​​the side wall; or,

[0027] An explosion-proof notch is provided in the middle area of ​​the side wall, and the explosion-proof notch surrounds and forms the explosion-proof valve.

[0028] On the other hand, a battery module is further disclosed. In addition to or as an alternative to one or more of the features disclosed above, the battery module includes a containing box; and a battery cell as described in any one of the above items, wherein the battery cell is accommodated in the containing box.

[0029] One of the above technical solutions has the following advantages or beneficial effects: in the present application, by arranging at least part of the electrical connection unit between the side wall where the explosion-proof valve is arranged and the electrode assembly, the electrical connection unit is used instead of the side plate to support the electrode assembly, so that an exhaust channel is formed between the side wall and the electrode assembly to ensure that the gas can smoothly flow to the explosion-proof valve and be discharged from the explosion-proof valve, thereby reducing the exhaust resistance of the battery, facilitating the discharge of gas inside the battery, improving the safety performance of the battery, and ultimately improving the comprehensive performance of the battery; at the same time, the use of components in the battery is reduced, the assembly efficiency of the battery is improved, and the production cost of the battery is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0031] Figure 1is a three-dimensional structural view of a battery cell provided according to an embodiment of the present application;

[0032] Figure 2 is a cross-sectional view of a battery cell provided according to an embodiment of the present application;

[0033] Figure 3 is an exploded structural view of a battery cell provided according to an embodiment of the present application;

[0034] Figure 4 is a structural diagram of a first electrical connector provided according to an embodiment of the present application;

[0035] Figure 5 is a structural diagram of a second electrical connector provided according to an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100. Battery cell;

[0038] 110, housing; 111, accommodating chamber; 112, side wall; 113, first end; 114, second end;

[0039] 120, electrode assembly; 121, electrode body; 122, first electrode tab; 123, second electrode tab;

[0040] 130. Explosion-proof valve;

[0041] 140, first cover plate;

[0042] 150, second cover plate;

[0043] 160, electrical connection unit; 161, first electrical connection member; 1611, first exhaust portion; 16111, first exhaust hole; 1612, first electrical connection member; 16121, first welding area; 162, second electrical connection member; 1621, second exhaust portion; 16211, second exhaust hole; 1622, second electrical connection member; 16221, second welding area;

[0044] 170, first pole;

[0045] 180. Second pole. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] At present, in the existing blade battery, it is necessary to set a side plate to support the electrode assembly, which is used to isolate the electrode assembly and the high-frequency welding seam, and form a bottom airway. In this way, the exhaust effect is poor, which affects the safety performance of the battery, and leads to a large number of internal structural parts of the battery, and the cost is also high; secondly, the explosion-proof valve of the existing blade battery is located on the cover plate, and there is also a pole on the cover plate. When the battery cell fails, the explosion-proof valve opens to exhaust, but the pole is electrically connected and is close to the explosion-proof valve. If sparks are generated at the explosion-proof valve, the electrical connection is easily damaged in a short time, affecting the safety performance of the battery; secondly, in the existing blade battery, the pole ear is led out from both sides of the length direction of the battery, and the two ends of the connecting piece in the length direction are connected to the pole ear, and then connected to the pole column to form an electrical connection. It is necessary to set an end plate between the pole ear and the pole column for isolation, but the end plate occupies the space of the electrode assembly, reduces the capacity of the battery, and thus reduces the cycle performance of the battery. The disadvantages outweigh the advantages, and ultimately affect the comprehensive performance of the battery.

[0051] To solve the above technical problems, please refer to Figures 1 to 5 In an embodiment of the present application, the present application provides a battery cell 100, and the battery cell 100 has a first direction Z and a second direction X that intersect each other. Preferably, the battery cell 100 has the first direction Z and the second direction X that are perpendicular to each other.

[0052] Here, “perpendicular” refers to a state where the angle formed by straight lines, straight lines and planes, or planes and planes is 89° to 91°.

[0053] Specifically, the battery cell 100 may include: a housing 110 , an electrode assembly 120 , an explosion-proof valve 130 , and an electrical connection unit 160 .

[0054] Specifically, the shell 110 is provided with an open accommodating cavity 111, and the shell 110 is provided with two side walls 112 arranged opposite to each other in the first direction Z, the electrode assembly 120 is accommodated in the accommodating cavity 111, the explosion-proof valve 130 is arranged on at least one of the two side walls 112, the electrical connection unit 160 is electrically connected to the electrode assembly 120, and at least part of the electrical connection unit 160 is arranged between the side wall 112 on which the explosion-proof valve 130 is arranged and the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120.

[0055] The battery cell 100 may be a lithium secondary battery, a lithium sulfur battery, a sodium ion battery or a magnesium ion battery, but is not limited thereto.

[0056] The battery cell 100 may be cylindrical, flat, rectangular or in other shapes.

[0057] It can be understood that in the present application, at least a portion of the electrical connection unit 160 is arranged between the side wall 112 on which the explosion-proof valve 130 is arranged and the electrode assembly 120, so that the electrical connection unit 160 is used instead of the side plate to support the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120 to ensure that the gas can smoothly flow to the explosion-proof valve and be discharged from the explosion-proof valve, thereby reducing the exhaust resistance of the battery, facilitating the discharge of gas inside the battery, improving the safety performance of the battery, and ultimately improving the comprehensive performance of the battery; at the same time, the use of components in the battery is reduced, the assembly efficiency of the battery is improved, and the production cost of the battery is reduced.

[0058] Further, see Figure 2 and Figure 3 The electrode assembly 120 includes an electrode body 121, a first electrode tab 122 and a second electrode tab 123. The first electrode tab 122 and the second electrode tab 123 are both connected to the electrode body 121, and the first electrode tab 122 and the second electrode tab 123 are both arranged close to the side wall 112 where the explosion-proof valve 130 is arranged.

[0059] The first electrode tab 122 and the second electrode tab 123 are both electrically connected to the electrical connection unit 160 .

[0060] The electrode body 121 is wound by a positive electrode sheet, a negative electrode sheet and a separator, and the separator is used to separate the positive electrode sheet from the negative electrode sheet. The positive electrode sheet, the negative electrode sheet and the separator are all manufactured using conventional products and manufacturing methods.

[0061] The first pole lug 122 can be a positive pole lug or a negative pole lug; the second pole lug 123 can be a negative pole lug or a positive pole lug. Specifically, when the first pole lug 122 is a positive pole lug, the second pole lug 123 is a negative pole lug. When the first pole lug 122 is a negative pole lug, the second pole lug 123 is a positive pole lug.

[0062] It can be understood that in the present application, by arranging the first pole ear 122 and the second pole ear 123 close to the side wall 112 where the explosion-proof valve 130 is arranged, there is no need to set an end plate, thereby increasing the occupied space of the electrode assembly 120, thereby increasing the capacity of the battery and improving the cycle performance of the battery; at the same time, the use of components in the battery is reduced, further improving the assembly efficiency of the battery and reducing the production cost of the battery.

[0063] In one embodiment, referring to Figures 2 to 3 The housing 110 is provided with a first end 113 and a second end 114 which are arranged opposite to each other in the second direction X;

[0064] The above-mentioned electrical connection unit 160 includes: a first electrical connection member 161 and a second electrical connection member 162, the first electrical connection member 161 is arranged at the first end 113, and at least a portion of the first electrical connection member 161 is arranged between the side wall 112 on which the explosion-proof valve 130 is arranged and the electrode assembly 120, and the second electrical connection member 162 is arranged at the second end 114, and at least a portion of the second electrical connection member 162 is arranged between the side wall 112 on which the explosion-proof valve 130 is arranged and the electrode assembly 120.

[0065] The first electrical connector 161 and the second electrical connector 162 are both made of metal. Preferably, the first electrical connector 161 and the second electrical connector 162 are both made of aluminum.

[0066] The first electrical connector 161 is electrically connected to the first electrode tab 122 , and the second electrical connector 162 is electrically connected to the second electrode tab 123 .

[0067] It can be understood that in the present application, at least part of the first electrical connector 161 and at least part of the second electrical connector 162 are arranged between the side wall 112 where the explosion-proof valve 130 is arranged and the electrode assembly 120, so that the first electrical connector 161 and the second electrical connector 162 are used to realize the electrical connection between the components in the battery, and at the same time, the first electrical connector 161 and the second electrical connector 162 are used to replace the side plate to support the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120 to ensure that the gas can smoothly flow to the explosion-proof valve and be discharged from the explosion-proof valve, thereby reducing the exhaust resistance of the battery, facilitating the exhaust of gas inside the battery, and improving the safety of the battery; at the same time, the use of components in the battery is reduced, the assembly efficiency of the battery is improved, and the production cost of the battery is reduced.

[0068] Please refer again Figure 2 and Figure 3 The battery cell 100 further includes: a first cover plate 140 and a second cover plate 150. The first cover plate 140 covers the opening of the first end 113 of the shell 110 and is connected to the shell 110. A first pole 170 is arranged on the first cover plate 140. At least a portion of the first electrical connector 161 is arranged between the first cover plate 140 and the electrode assembly 120, and the first electrical connector 161 is electrically connected to the first pole 170. The second cover plate 150 covers the opening of the second end 114 of the shell 110 and is connected to the shell 110. A second pole 180 is arranged on the second cover plate 150. At least a portion of the second electrical connector 162 is arranged between the second cover plate 150 and the electrode assembly 120, and the second electrical connector 162 is electrically connected to the second pole 180.

[0069] The first pole 170 can be a positive pole or a negative pole; the second pole 180 can be a negative pole or a positive pole. Specifically, when the first pole 170 is a positive pole, the second pole 180 is a negative pole. When the first pole 170 is a negative pole, the second pole 180 is a positive pole.

[0070] It can be understood that in the present application, the explosion-proof valve 130 is arranged on the side wall 112 arranged in the first direction Z, and the first pole 170 and the second pole 180 are arranged on the first cover plate 140 and the second cover plate 150 respectively arranged in the second direction X, so that the explosion-proof valve 130, the first pole 170, and the second pole 180 are located at different side ends, so that when the battery fails, the explosion-proof valve 130 opens the jet or generates sparks and moves away from the first pole and the second pole, achieving fire-electricity separation and improving the safety of the battery. At the same time, the first electrical connector 161 is used to realize the electrical connection between the first pole ear 122 and the first pole 170, and the second electrical connector 162 is used to realize the electrical connection between the second pole ear 123 and the second pole 180, so as to ensure the normal use of the battery cell 100.

[0071] In one embodiment, referring to Figures 2 to 4 The above-mentioned first electrical connection member 161 includes: a first exhaust portion 1611 and a first electrical connection portion 1612, the first exhaust portion 1611 and the first electrical connection portion 1612 are integrally formed, the first exhaust portion 1611 is arranged at the first end 113, the first exhaust portion 1611 is arranged between the side wall 112 where the explosion-proof valve 130 is arranged and the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120; the first electrical connection portion 1612 is arranged between the first cover plate 140 and the electrode assembly 120, and the first electrical connection portion 1612 is electrically connected to the first pole 170.

[0072] The first exhaust portion 1611 and the first electrical connection portion 1612 are in an L shape.

[0073] The first exhaust portion 1611 is electrically connected to the first electrode tab 122. Specifically, the first electrode tab 122 is welded to the first exhaust portion 1611, but the present invention is not limited thereto.

[0074] It can be understood that in the present application, the first exhaust portion 1611 is arranged between the side wall 112 on which the explosion-proof valve 130 is arranged and the electrode assembly 120, so that the first exhaust portion 1611 is used instead of the side plate to support the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120 to ensure that the gas can smoothly flow to the explosion-proof valve and be discharged from the explosion-proof valve, thereby reducing the exhaust resistance of the battery, facilitating the exhaust of gas inside the battery, and improving the safety of the battery; at the same time, the first exhaust portion 1611 is electrically connected to the first pole ear 122, and the first electrical connection portion 1612 is electrically connected to the first pole column 170, so as to achieve electrical connection between the first pole ear 122 and the first pole column 170 to ensure the normal use of the battery cell 100.

[0075] In a preferred embodiment of the present application, the thickness of the first exhaust portion 1611 in the first direction Z is H1 mm, satisfying: 2≤H1≤4.

[0076] Furthermore, the thickness of the first vent portion 1611 may be uniform or non-uniform. When it is a structure with uniform thickness, the thickness of the first vent portion 1611 is fixed. If it is not a structure with uniform thickness, the thickness is a range value rather than a single point data.

[0077] Generally, the thickness of the first exhaust portion 1611 is consistent. Even if it is inconsistent, there is a small thickness difference due to processing.

[0078] Specifically, the thickness of the first exhaust portion 1611 in the first direction Z is H1 mm, which can be controlled within the range of 2 to 4 mm. For example, when the thickness of the first exhaust portion 1611 is uniform, the thickness H1 mm can be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm or 4 mm. It should be noted that when the thickness of the first exhaust portion 1611 is not uniform, any value of its thickness H1 mm within the range of 2 to 2.5 mm, 2.5 to 3 mm or 3 to 4 mm is within the protection scope of the present application. It is worth noting that the specific value of the thickness H1 mm is only given as an example, and any value of the thickness within the range of 2 to 4 mm is within the protection scope of the present application.

[0079] It is understandable that when the thickness H1 mm of the first exhaust portion 1611 in the first direction Z is less than 2 mm, the space of the exhaust channel formed between the side wall 112 and the electrode assembly 120 is small, and the gas cannot be discharged smoothly, affecting the safety of the battery; when the thickness H1 mm of the first exhaust portion 1611 in the first direction Z is greater than 4 mm, the first exhaust portion 1611 occupies too much space and the battery capacity is small. In this application, the thickness H1 mm of the first exhaust portion 1611 in the first direction Z is controlled within the range of 2 to 4 mm to ensure that the exhaust channel has sufficient space size, improve the safety performance of the battery, and at the same time increase the occupied space of the electrode assembly 120, increase the capacity of the battery, and finally improve the overall performance of the battery.

[0080] In one embodiment, referring to Figure 4 A first exhaust hole 16111 is opened on the first exhaust portion 1611, and the first exhaust hole 16111 is fluidly connected to the exhaust channel.

[0081] In the present application, a first exhaust hole 16111 is opened on the first exhaust portion 1611 so as to connect the first exhaust hole 16111 with the exhaust channel fluid, thereby further facilitating the flow of gas in the housing 110 and improving the safety performance of the battery.

[0082] In one embodiment, referring to Figure 5 A first welding area 16121 is provided on the first electrical connection portion 1612 , and the first pole 170 is welded to the first welding area 16121 .

[0083] In one embodiment, referring to Figure 2 , Figure 3 and Figure 5 The second electrical connection part 162 includes: a second exhaust portion 1621 and a second electrical connection portion 1622, the second electrical connection portion 1622 and the second exhaust portion 1621 are integrally formed, the second exhaust portion 1621 is arranged at the second end 114, the second exhaust portion 1621 is arranged between the side wall 112 where the explosion-proof valve 130 is arranged and the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120; the second electrical connection portion 1622 is arranged between the second cover plate 150 and the electrode assembly 120, and the second electrical connection portion 1622 is electrically connected to the second pole 180.

[0084] The second exhaust portion 1621 and the second electrical connection portion 1622 are in an L shape.

[0085] The second exhaust portion 1621 is electrically connected to the second electrode tab 123. Specifically, the second electrode tab 123 is welded to the second exhaust portion 1621, but the present invention is not limited thereto.

[0086] It can be understood that in the present application, the second exhaust portion 1621 is arranged between the side wall 112 on which the explosion-proof valve 130 is arranged and the electrode assembly 120, so that the second exhaust portion 1621 is used instead of the side plate to support the electrode assembly 120, so that an exhaust channel is formed between the side wall 112 and the electrode assembly 120 to ensure that the gas can smoothly flow to the explosion-proof valve and be discharged from the explosion-proof valve, thereby reducing the exhaust resistance of the battery, facilitating the exhaust of gas inside the battery, and improving the safety of the battery; at the same time, the second exhaust portion 1621 is electrically connected to the second pole ear 123, and the second electrical connection portion 1622 is electrically connected to the second pole column 180, so as to achieve electrical connection between the second pole ear 123 and the second pole column 180 to ensure the normal use of the battery cell 100.

[0087] In a preferred embodiment of the present application, the thickness of the second exhaust portion 1621 in the first direction Z is H2 mm, satisfying: 2≤H2≤4.

[0088] Furthermore, the thickness of the second vent portion 1621 may be uniform or non-uniform. When it is a structure with uniform thickness, the thickness of the second vent portion 1621 is fixed. If it is a structure with non-uniform thickness, the thickness is a range value rather than a single point data.

[0089] Generally, the thickness of the second exhaust portion 1621 is consistent. Even if it is inconsistent, there is a small thickness difference due to processing.

[0090] Specifically, the thickness H2 mm of the second exhaust portion 1621 in the first direction Z can be controlled within the range of 2 to 4 mm. For example, when the thickness dimension of the second exhaust portion 1621 is uniform, the thickness H2 mm can be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm or 4 mm. It should be noted that when the thickness dimension of the second exhaust portion 1621 is not uniform, any value of its thickness H2 mm within the range of 2 to 2.5 mm, 2.5 to 3 mm or 3 to 4 mm is within the protection scope of the present application. It is worth noting that the specific value of the thickness H2 mm is only given as an example, and any value of the thickness within the range of 2 to 4 mm is within the protection scope of the present application.

[0091] It is understandable that when the thickness H2 mm of the second exhaust portion 1621 in the first direction Z is less than 2 mm, the space of the exhaust channel formed between the side wall 112 and the electrode assembly 120 is small, and the gas cannot be discharged smoothly, affecting the safety of the battery; when the thickness H2 mm of the second exhaust portion 1621 in the first direction Z is greater than 4 mm, the second exhaust portion 1621 occupies too much space and the battery capacity is small. In this application, the thickness H2 mm of the second exhaust portion 1621 in the first direction Z is controlled within the range of 2 to 4 mm to ensure that the exhaust channel has sufficient space size, improve the safety performance of the battery, and at the same time increase the occupied space of the electrode assembly 120, increase the capacity of the battery, and finally improve the overall performance of the battery.

[0092] In one embodiment, the thickness of the second vent portion 1621 is the same as the thickness of the second vent portion 1621 .

[0093] In one embodiment, again referring to Figure 5 The second exhaust portion 1621 is provided with a second exhaust hole 16211, and the second exhaust hole 16211 is in fluid communication with the exhaust channel. In the present application, the second exhaust hole 16211 is provided on the second exhaust portion 1621, so as to be in fluid communication with the exhaust channel, thereby further facilitating the flow of gas in the housing 110 and improving the safety performance of the battery.

[0094] In one embodiment, referring to Figure 5 The second electrical connection portion 1622 is provided with a second welding area 16221 , and the second pole 180 is welded to the second welding area 16221 .

[0095] In one embodiment, the explosion-proof valve 130 is welded to the middle area of ​​the side wall 112, that is, the explosion-proof valve 130 is fixedly connected to the middle area of ​​the side wall 112, so as to facilitate the overall assembly of the battery cell 100 and improve the assembly efficiency of the battery cell 100. In another embodiment, the middle area of ​​the side wall 112 is provided with an explosion-proof notch, and the explosion-proof notch surrounds the explosion-proof valve 130, that is, the explosion-proof valve 130 is integrally formed with the side wall 112, so as to facilitate processing and reduce processing steps.

[0096] On the other hand, in an embodiment of the present application, the present application further provides a battery module, including: a containing box; and a battery cell 100 as described above, wherein the battery cell 100 is accommodated in the containing box.

[0097] The battery module may be a battery module directly composed of battery cells 100. The battery module may also be a battery pack. The battery pack may be composed of battery cells 100 to form a battery module and then a battery pack. The battery module may also be directly composed of battery cells 100.

[0098] On the other hand, in an embodiment of the present application, the present application further provides an electric device, including the battery module as described above, the battery module serving as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc.

[0099] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery cell having a first direction and a second direction intersecting each other, characterized in that: include: A shell, provided with an open accommodating cavity, the shell being provided with two side walls arranged opposite to each other in the first direction, and the shell being provided with a first end and a second end arranged opposite to each other in the second direction; An electrode assembly is accommodated in the accommodating cavity; an explosion-proof valve, disposed on at least one of the two side walls; as well as an electrical connection unit, the electrical connection unit being electrically connected to the electrode assembly, and at least a portion of the electrical connection unit being disposed between the side wall on which the explosion-proof valve is disposed and the electrode assembly, so that an exhaust passage is formed between the side wall and the electrode assembly; The electrical connection unit includes: a first electrical connection member, the first electrical connection member is disposed at the first end, and the first electrical connection member includes: a first exhaust portion, disposed at the first end; and A second electrical connector, the second electrical connector is disposed at the second end, and the second electrical connector includes: a second exhaust portion, disposed at the second end; The first exhaust portion and the second exhaust portion are both disposed between the side wall on which the explosion-proof valve is disposed and the electrode assembly, so that an exhaust passage is formed between the side wall and the electrode assembly; A first exhaust hole is formed on the first exhaust portion, and the first exhaust hole is in fluid communication with the exhaust channel; The second exhaust portion is provided with a second exhaust hole, and the second exhaust hole is in fluid communication with the exhaust channel.

2. The battery cell according to claim 1, characterized in that: The electrode assembly comprises: an electrode body, a first electrode tab and a second electrode tab, wherein the first electrode tab and the second electrode tab are both connected to the electrode body, and the first electrode tab and the second electrode tab are both arranged close to the side wall where the explosion-proof valve is arranged; The first electrode tab is electrically connected to the first exhaust portion, and the second electrode tab is electrically connected to the second exhaust portion.

3. The battery cell according to claim 1, characterized in that: The battery cell further includes: a first cover plate, covering the opening of the first end of the shell and connected to the shell, a first pole is arranged on the first cover plate, at least part of the first electrical connector is arranged between the first cover plate and the electrode assembly, and the first electrical connector is electrically connected to the first pole; and A second cover plate covers the opening of the second end of the shell and is connected to the shell. A second pole is arranged on the second cover plate. At least part of the second electrical connector is arranged between the second cover plate and the electrode assembly, and the second electrical connector is electrically connected to the second pole.

4. The battery cell according to claim 3, characterized in that: The first electrical connector further includes: a first electrical connection portion, the first electrical connection portion and the first exhaust portion are integrally formed, the first electrical connection portion is disposed between the first cover plate and the electrode assembly, and the first electrical connection portion is electrically connected to the first pole; The second electrical connector also includes: a second electrical connection portion, the second electrical connection portion is integrally formed with the second exhaust portion, the second electrical connection portion is arranged between the second cover plate and the electrode assembly, and the second electrical connection portion is electrically connected to the second pole.

5. The battery cell according to claim 4, characterized in that: A first welding area is provided on the first electrical connection portion, and the first pole is welded to the first welding area; The second electrical connection portion is provided with a second welding area, and the second pole is welded to the second welding area.

6. The battery cell according to claim 1, characterized in that: The explosion-proof valve is welded to the middle area of ​​the side wall; or, An explosion-proof notch is provided in the middle area of ​​the side wall, and the explosion-proof notch surrounds and forms the explosion-proof valve.

7. A battery module, characterized in that: include: Containing box; as well as The battery cell according to any one of claims 1 to 6, wherein the battery cell is accommodated in the housing box.

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