Battery and battery module

Abstract

The utility model relates to the field of new energy, in particular to a battery and a battery module. The battery comprises a shell, and the shell comprises a shell body which is defined by a plurality of side plates and is internally provided with an accommodating space; the end cover covers at least one end of the shell and seals the accommodating space, and an electrode structure is arranged on the end cover; the anti-explosion valve is arranged on the side plate; the side plate where the anti-explosion valve is located comprises a plate body and a boss part protruding out of the plate body, the boss part extends from the first end of the side plate to the second end of the side plate in the first direction, and the anti-explosion valve is arranged on the boss part. By applying the technical scheme provided by the invention, the problems of large weight and high cost of the battery in the related technology can be effectively solved.

Description

Technical Field

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

[0002] Power batteries have the characteristics of high energy density, long cycle life, no memory effect and environmental friendliness. They are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles.

[0003] In the related art, the explosion-proof valve and electrode structure of the battery are generally arranged on the top cover. When the internal air pressure of the battery increases, the explosion-proof valve is pushed open, causing solids such as the battery pole terminals to splash out along with electrolyte and other substances, causing more serious safety accidents.

[0004] For safety reasons, current batteries generally use thermoelectric separation technology to weld the explosion-proof valve to the side wall of the shell, but the side plate where the explosion-proof valve is located needs to have a larger wall thickness, which will increase the overall weight and cost of the battery. Utility Model Content

[0005] The present application provides a battery and a battery module to solve the problems of heavy weight and high cost of batteries in related technologies.

[0006] In one aspect, the present application provides a battery, the battery comprising a housing, the housing comprising:

[0007] A shell body, surrounded by a plurality of side panels, and having a containing space inside the shell body;

[0008] An end cover is disposed on at least one end of the shell and closes the accommodation space, and an electrode structure is disposed on the end cover;

[0009] Explosion-proof valve, arranged on the side panel;

[0010] Among them, the side plate where the explosion-proof valve is located includes a plate body and a boss portion protruding from the plate body, the boss portion extends from the first end of the side plate to the second end of the side plate along a first direction, an air flow channel structure is formed between the side wall of the boss portion and the surface of the plate body, and the explosion-proof valve is arranged on the boss portion.

[0011] In some embodiments, the housing includes a first side plate and a second side plate that are oppositely disposed, and a third side plate and a fourth side plate that are disposed between the first side plate and the second side plate, and the first side plate, the second side plate, the third side plate and the fourth side plate surround the housing and form a receiving space;

[0012] The area of ​​the first side plate is greater than the area of ​​the third side plate, and the boss portion is arranged on the third side plate.

[0013] In some embodiments, the third side plate includes a first end and a second end opposite each other in a first direction, and the boss portion extends from the first end of the third side plate to the second end of the third side plate;

[0014] The first direction is the length direction of the third side plate.

[0015] In some embodiments, the boss portion is located on a side of the third side plate close to the first side plate; or, the boss portion is arranged at the center of the third side plate in the second direction, wherein the second direction is the width direction of the third side plate.

[0016] In some embodiments, the boss portion is disposed on a surface of the side plate facing away from the accommodation space;

[0017] Alternatively, the boss portion is provided on a surface of the side plate facing the accommodation space.

[0018] In some embodiments, the thickness of the plate body is T1, the overall thickness of the plate body and the boss portion is T2, and T1 and T2 satisfy: T1<T2≤1.5mm;

[0019] and / or,

[0020] The width of the boss portion is W1, the width of the third side plate is W2, and W1 and W2 satisfy: 0.15<W1 / W2≤0.85;

[0021] and / or,

[0022] The area of ​​the third side plate is S1, the projection area of ​​the boss portion on the third side plate is S2, the surface area of ​​the shell is S3, and S1, S2 and S3 satisfy: 0.15<S2 / S1<0.85, and 0<S2 / S3<0.4.

[0023] In some embodiments, the circumferential edge of the end cover is conformally matched with the circumferential side wall of the shell, the end cover is welded to the shell to form a weld, and a distance H2 is provided between the weld and the outer surface of the boss portion, and H2 is between 0.1 mm and 5 mm.

[0024] In some embodiments, the battery further comprises an outer envelope wrapped around the axially outer side of the shell, the outer envelope having a starting end and an ending segment, the starting end and the ending end having an overlapping area, and the overlapping area is located on the surface of the plate body.

[0025] On the other hand, the present application also provides a battery module, the battery module includes a battery pack, the battery pack includes a plurality of single cells arranged along a second direction, wherein the second direction is arranged perpendicular to the first direction, and the single cells are the above-mentioned batteries.

[0026] In some embodiments, an air flow channel is formed between the side wall of the boss portion of the single battery and the surface of the plate body, and the battery module further comprises:

[0027] The flame retardant plate includes a bottom plate and limiting ribs arranged on the bottom plate, the limiting ribs are matched with the battery pack, and the limiting ribs matched with the end cover of the single battery are provided with exhaust gaps, and the exhaust gaps are arranged opposite to the air flow channel; exhaust holes are provided on the bottom plate, and the explosion-proof valve of each single battery is connected to the exhaust hole.

[0028] In some embodiments, an exhaust groove is further provided on the bottom plate, the bottom wall of the exhaust groove is lower than the surface of the bottom plate facing the battery pack, at least one end of the exhaust groove passes through the edge of the bottom plate, and the exhaust hole is provided in the exhaust groove.

[0029] The battery provided in the present application includes a shell, and the shell includes: a shell, an end cover and an explosion-proof valve. The side plate where the explosion-proof valve is located includes a plate body and a boss portion, and the explosion-proof valve is arranged on the boss portion. In essence, the thickness of the side plate where the explosion-proof valve is located includes the overall thickness of the boss portion and the plate body, so that the location where the explosion-proof valve is installed has a sufficiently large installation strength. At the same time, the side plate where the explosion-proof valve is located also includes a relatively thin plate body, and the side plate is not thickened as a whole, which effectively controls the weight of the side plate where the explosion-proof valve is located, saves the material cost of the side plate where the explosion-proof valve is located, and thus helps to reduce the weight and production cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] Figure 1 A schematic diagram of the exploded structure of a battery housing provided in one embodiment of the present application;

[0032] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A of the shell;

[0033] Figure 3 A side view of a battery housing provided in accordance with an embodiment of the present application;

[0034] Figure 4 for Figure 3 BB section view of the shell;

[0035] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at C of the shell;

[0036] Figure 6 for Figure 3 DD section view of the shell;

[0037] Figure 7 for Figure 6 A schematic diagram of the enlarged structure at E of the shell;

[0038] Figure 8 A schematic diagram of the structure of a battery housing provided in one embodiment of the present application;

[0039] Fig. 9 A schematic diagram of the exploded structure of a battery housing provided in another embodiment of the present application;

[0040] Fig.10 A schematic structural diagram of a battery housing provided in yet another embodiment of the present application;

[0041] Fig.11 A schematic structural diagram of a battery housing provided in yet another embodiment of the present application;

[0042] Fig.12 A schematic diagram of the three-dimensional structure of a battery module provided in an embodiment of the present application;

[0043] Fig.13 A schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application from one perspective;

[0044] Fig.14 A schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application from another perspective;

[0045] Fig.15 A side view of a battery module provided in an embodiment of the present application;

[0046] Fig.16 for Fig.15 Schematic diagram of the enlarged structure at F of the battery module.

[0047] Description of reference numerals:

[0048] 10. Battery; 20. Battery module;

[0049] 100, housing; 101, accommodating space; 110, first side plate; 120, second side plate; 130, third side plate; 131, plate body; 132, boss portion; 133, air flow channel; 140, fourth side plate;

[0050] 200, end cover; 210, raised structure;

[0051] 300, explosion-proof valve;

[0052] 400. Electrode structure;

[0053] 500, weld;

[0054] 600, outer envelope; 601, overlapping region; 610, starting end; 620, ending end;

[0055] 700, battery pack;

[0056] 800, flame retardant plate; 810, bottom plate; 811, exhaust hole; 812, exhaust groove; 820, limiting rib; 821, exhaust notch. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] Power batteries have been widely used in plug-in hybrid vehicles, hybrid electric vehicles and pure electric vehicles due to their high energy density, long life, no memory effect and environmental protection characteristics.

[0059] In order to improve the safety performance of the battery, an explosion-proof valve and a pole structure are usually installed on the top of the battery. When the internal pressure of the battery increases, the explosion-proof valve will automatically open, causing the internal substances of the battery, including electrolytes and electrode materials, to be ejected, which may cause larger-scale safety problems.

[0060] In order to reduce this risk, current batteries use thermal separation technology to weld the explosion-proof valve to the side plate of the battery shell. However, this means that the side plate where the explosion-proof valve is located must be thick enough to withstand the internal pressure, which increases the overall weight and production cost of the battery.

[0061] In view of this, the present application provides a battery, which changes the structure of the side plate, sets the side plate where the explosion-proof valve is located as a plate body with different wall thicknesses, sets the explosion-proof valve at the plate body with larger thickness, and leaves a thin plate area of ​​a predetermined area. This not only ensures the strength of the side plate, but also reduces the weight of the side plate, which helps to reduce the overall weight of the battery pack and is also beneficial to reducing the cost of the battery pack.

[0062] The following is a description of the battery, battery module and power-consuming device provided in the embodiments of the present application in conjunction with the accompanying drawings. It should be noted that the battery provided in the embodiments of the present application is a secondary battery, that is, the battery in the embodiments of the present application can be charged and discharged and recycled, and the specific type of battery can include but is not limited to lithium batteries, etc., and the scenarios in which the battery can be used include but are not limited to electronic products, energy storage equipment, transportation vehicles, etc., such as mobile communication equipment, new energy vehicles, drones, etc., and the embodiments of the present application do not specifically limit this.

[0063] Figure 1 A schematic diagram of the exploded structure of a battery housing provided in one embodiment of the present application; Figure 2 for Figure 1A schematic diagram of the enlarged structure at A of the shell; Figure 3 A side view of a battery housing provided in accordance with an embodiment of the present application; Figure 4 for Figure 3 BB section view of the shell; Figure 5 for Figure 4 Schematic diagram of the enlarged structure at C of the shell.

[0064] like Figures 1 to 5 As shown, the battery 10 of this embodiment includes a shell, which includes: a shell 100, an end cover 200 and an explosion-proof valve 300.

[0065] The housing 100 is surrounded by a plurality of side panels, and a receiving space 101 is provided in the housing, and the receiving space 101 is used to receive battery cells, electrolyte, and the like.

[0066] The end cover 200 is disposed on at least one end of the housing 100 and closes the accommodating space 101 . The electrode structure 400 is disposed on the end cover 200 .

[0067] The explosion-proof valve 300 is arranged on the side plate. When the battery 10 is in thermal runaway, the internal pressure of the battery increases sharply. When the pressure reaches a predetermined pressure, the explosion-proof valve 300 can be broken to release the internal pressure of the battery and avoid more serious accidents.

[0068] Specifically, the side plate where the explosion-proof valve 300 is located includes a plate body 131 and a boss portion 132 protruding from the surface of the plate body 131 , the boss portion 132 extends from the first end of the side plate to the second end of the side plate along a first direction, and the explosion-proof valve 300 is arranged on the boss portion 132 .

[0069] By applying the technical solution of this embodiment, the side plate where the explosion-proof valve 300 is located includes a plate body 131 and a boss portion 132, and the explosion-proof valve 300 is arranged on the boss portion 132. In essence, the thickness of the side plate where the explosion-proof valve 300 is located includes the overall thickness of the boss portion 132 and the plate body 131, so that the location where the explosion-proof valve 300 is installed has a sufficiently large installation strength. At the same time, the side plate where the explosion-proof valve 300 is located also includes a relatively thin plate body 131, and the side plate is not thickened as a whole, which effectively controls the weight of the side plate where the explosion-proof valve 300 is located, saves the material cost of the side plate where the explosion-proof valve 300 is located, and further helps to reduce the weight and production cost of the battery pack.

[0070] It should also be noted that if Figures 1 to 5 As shown, in some embodiments, the boss portion 132 can be disposed on the surface of the side plate facing away from the accommodating space 101, that is, the boss portion 132 can be observed on the side plate of the battery 10 without opening the battery casing.

[0071] It should also be noted that the end cover 200 may include two end covers 200, which are respectively covered at both ends of the shell and close the accommodating space 101. The electrode structure 400 is arranged on the end cover 200. Specifically, the electrode structure 400 includes a positive electrode column and a negative electrode column. The positive electrode column is arranged on one of the two end covers 200, and the negative electrode column is arranged on the other.

[0072] Of course, in other embodiments, the end cover may include only one, and the electrode structure includes a positive electrode column and a negative electrode column, and the positive electrode column and the negative electrode column are both arranged on the end cover.

[0073] In some embodiments, the boss portion 132 may be disposed on a surface of the side plate that faces away from the receiving space 101. In other embodiments, the boss portion 132 may also be disposed on a surface of the side plate that faces the receiving space 101.

[0074] Specifically, Fig.10 This is a schematic diagram of the structure of a battery housing provided in yet another embodiment of the present application. Fig.11 This is a schematic diagram of the structure of a battery housing provided in yet another embodiment of the present application. Fig.10 and Fig.11 As shown, the boss portion 132 is arranged on the surface of the side plate facing the accommodation space 101, and the explosion-proof valve 300 is arranged on the boss portion 132. This arrangement can also ensure the installation strength of the explosion-proof valve 300, and at the same time, due to the relatively thin plate structure, it can also play a role in reducing the weight of the side plate.

[0075] The specific structure of the housing will be described below with reference to the accompanying drawings.

[0076] like Figures 1 to 5 As shown, in some embodiments, the shell 100 includes a first side plate 110 and a second side plate 120 that are relatively arranged, and a third side plate 130 and a fourth side plate 140 that are arranged between the first side plate 110 and the second side plate 120. The first side plate 110, the second side plate 120, the third side plate 130 and the fourth side plate 140 surround the shell and form a accommodating space 101.

[0077] The first side plate 110 and the second side plate 120 are the large surfaces of the battery, and the two have the same area. The area of ​​the first side plate 110 is larger than the area of ​​the third side plate 130, and the areas of the third side plate 130 and the fourth side plate 140 are the same. The boss portion 132 is arranged on the third side plate 130, that is, the boss portion 132 is arranged on the side plate with a relatively small area.

[0078] It should be noted that the third side plate 130 includes a plate body 131 and a boss portion 132 , and the thickness of the plate body 131 may be the same as the thickness of the remaining first side plate 110 , the second side plate 120 and the fourth side plate 140 .

[0079] It should also be noted that the side wall of the boss portion 132 can be arranged perpendicular to the surface of the plate body, or can be arranged at an obtuse angle or an acute angle with the surface of the plate body. Of course, the side wall can also be an arc surface. Exemplarily, the angle between the side wall of the boss portion 132 and the surface of the plate body is an obtuse angle or a right angle.

[0080] In addition, the boss portion 132 is located on a side of the third side plate 130 close to the first side plate. In other embodiments, the boss portion 132 may also be disposed at the center of the third side plate 130 in the second direction, where the second direction is the width direction of the third side plate.

[0081] The dimension setting parameters of the housing are explained below with reference to the accompanying drawings.

[0082] like Figure 5 As shown, in some embodiments, the thickness of the plate body 131 is T1, the overall thickness of the plate body 131 and the boss portion 132 is T2, and T1 and T2 satisfy: T1<T2≤1.5 mm.

[0083] In the above structure, the thickness T1 of the plate 131 is substantially the thickness of the third side plate 130 without the boss 132. To ensure that the housing 100 maintains a relatively small weight, the overall thickness T2 of the plate 131 and the boss 132 may not exceed 1.5 mm.

[0084] The thicknesses of the first side plate 110 , the second side plate 120 , the portion of the third side plate 130 where the boss portion 132 is not provided, and the fourth side plate 140 may be the same, that is, the thicknesses of the above plates are all T1 .

[0085] Of course, in some embodiments, the thickness of the first side plate 110 , the second side plate 120 , and the fourth side plate 140 may also be smaller than or larger than the thickness of the portion of the third side plate 130 where the boss portion 132 is not provided.

[0086] For example, the value of the overall thickness T2 of the plate body 131 and the boss portion 132 may be 1 mm, 1.3 mm or 1.5 mm.

[0087] Figure 8 A schematic diagram of the structure of a battery housing provided in one embodiment of the present application is shown in FIG. Figure 8 As shown, the width of the boss portion 132 is W1, the width of the third side plate 130 is W2, and W1 and W2 satisfy: 0<W1 / W2≤0.5.

[0088] In the above structure, if the width W1 of the boss portion 132 is too small, it will squeeze the installation space of the explosion-proof valve. If the width of the boss portion 132 is too large, the weight of the third side plate 130 will increase. Therefore, W1 and W2 can meet the installation range of 0<W1 / W2≤0.5, thereby reducing the weight of the third side plate 130 while ensuring the installation space of the explosion-proof valve.

[0089] It should also be noted that the width W2 of the third side plate 130 does not exceed 500 mm.

[0090] like Figure 1 As shown, in some embodiments, the area of ​​the third side plate 130 is S1, the projection area of ​​the boss portion 132 on the third side plate 130 is S2, the surface area of ​​the shell is S3 (the total surface area of ​​the first side plate, the second side plate, the third side plate and the fourth side plate), S1, S2 and S3 satisfy: 0.15<S2 / S1<0.85, S2 and S3 satisfy: 0<S2 / S3<0.4.

[0091] In the above structure, if the projection area S2 of the boss portion 132 on the third side plate 130 is too small, the installation space of the explosion-proof valve 300 will be squeezed. If the projection area S2 of the boss portion 132 on the third side plate 130 is too large, the weight of the third side plate 130 will be increased. Therefore, S1 and S2 satisfy 0.15<S2 / S1<0.85, which can minimize the weight of the third side plate 130 while ensuring the installation area of ​​the explosion-proof valve 300.

[0092] Illustratively, the ratio of S2 / S1 may be 0.15, 0.3, 0.4, 0.5, 0.6 or 0.85.

[0093] In addition, it is also necessary to limit the area occupied by the boss portion 132 relative to the shell to prevent the area of ​​the boss portion 132 from being too small, thereby reducing the strength of the third side plate 130, so that S2 and S3 can satisfy: 0<S2 / S3<0.4.

[0094] Illustratively, the ratio of S2 / S3 may be 0.1, 0.2, 0.3 or 0.4.

[0095] It should also be noted that if Figure 8 As shown, the height H1 of the housing 100 (as shown in FIG. Figure 8 The dimension in the z direction shown) is between 200 mm and 1.5 m.

[0096] In some embodiments, the circumferential edge of the end cover 200 is arranged in a conformal manner with the circumferential side wall of the shell. Conformal manner means that the contour of the circumferential edge of the end cover 200 is arranged in a conformal manner with the shape of the circumferential side wall of the shell. For example, if the shell side wall near the end cover 200 has a boss portion, a convex structure is arranged at the end cover 200 corresponding to the boss portion; if the shell side wall near the end cover 200 has a groove portion, a groove structure is arranged at the end cover 200 corresponding to the groove portion.

[0097] Specifically, Figure 2 As shown, since the boss portion 132 is provided on the third side plate 130 of the shell 100 , the end cover 200 also needs to be provided with a protruding structure 210 at the position where the boss portion 132 is located to ensure a good welding effect between the end cover 200 and the shell 100 .

[0098] Furthermore, the end cover 200 is welded to the shell 100 to form a weld 500, and there is a distance H2 between the weld 500 and the outer surface of the boss portion 132, and H2 is between 0.1 mm and 5 mm. Such a setting can ensure that the molten pool of the weld 500 covers the end cover and the shell at the same time, thereby ensuring the welding effect of the end cover 200 and the shell 100.

[0099] Furthermore, a distance H2 between the weld 500 and the outer surface of the boss portion 132 may be between 0.2 mm and 2.0 mm.

[0100] It should also be noted that the end cover 200 and the housing 100 can be welded by laser.

[0101] In some embodiments, the battery 10 further includes an outer envelope 600. Figure 6 for Figure 3 DD section view of the shell, Figure 7 for Figure 6 Schematic diagram of the enlarged structure at E of the shell.

[0102] like Figure 6 and Figure 7 As shown, the outer envelope 600 is wrapped around the axial outer side of the shell, and the outer envelope 600 has a starting end 610 and an ending end 620 . The starting end 610 and the ending end 620 have an overlapping area 601 , and the overlapping area 601 is located on the surface of the plate body 131 .

[0103] In the above structure, the outer film 600 can protect the battery 10 to enhance the safety of the battery 10. The outer film 600 is connected through the starting end 610 and the ending end 620 to form a wrapping effect on the shell 100. Specifically, the connection between the starting end 610 and the ending end 620 forms an overlapping area 601. Since the overlapping area 601 has a certain thickness, the overlapping area 601 is located on the surface of the plate body 131. Since the area on the plate body 131 where the boss portion 132 is not provided forms a space with a relatively thin thickness, the overlapping area 601 is located on the surface of the plate body 131 to avoid the overlapping area 601 from increasing the size of the battery.

[0104] It should be noted that the shell can be made of aluminum, stainless steel, copper, steel-aluminum composite material, copper-aluminum composite material, etc., preferably aluminum and stainless steel. The above materials are easy to process and help reduce costs.

[0105] It should also be noted that the production process of the housing 100 may include aluminum extrusion process, precision drawing process, sheet metal bending process, welding process, roll welding process, etc. Preferably, the production process of the housing 100 adopts aluminum extrusion process and precision drawing process, which helps to reduce costs and improve production capacity.

[0106] On the other hand, the present application also provides a battery module 20, and the specific structure of the battery module 20 is described below in conjunction with the accompanying drawings.

[0107] Fig.12 A schematic diagram of the three-dimensional structure of a battery module provided in an embodiment of the present application; Fig.13 A schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application from one perspective; Fig.14 A schematic diagram of the exploded structure of a battery module provided in an embodiment of the present application from another perspective; Fig.15 A side view of a battery module provided in an embodiment of the present application; Fig.16 for Fig.15 Schematic diagram of the enlarged structure at F of the battery module.

[0108] like Figures 12 to 16 As shown, the battery module 20 includes a battery pack 700, and the battery pack 700 includes a plurality of single cells arranged along a second direction, wherein the second direction (eg Fig.12 The y direction shown in the figure is arranged perpendicular to the first direction, and the single cell is the battery 10. Since the battery has the advantages of light weight, low cost, good heat dissipation and high safety, the battery module 20 having the battery also has the above advantages.

[0109] Specifically, each single battery is provided with an explosion-proof valve 300 , and the side plate where each explosion-proof valve 300 is located includes a plate body 131 and a boss portion 132 , and the explosion-proof valve 300 is provided on the boss portion 132 .

[0110] Since the boss portion 132 is arranged on the surface of the side plate facing away from the accommodating space 101, an air flow channel 133 can be formed between the side wall of the boss portion 132 and the outer surface of the plate body 131. The air flow channel 133 can be used as a circulation channel. When the battery cell thermally runs away, the explosion-proof valve is pushed open, and ejected substances such as gas, solid and electrolyte can flow and disperse along the air flow channel 133, so that the battery can effectively dissipate heat and avoid more serious accidents.

[0111] In addition, due to the provision of the airflow channel 133, a gap can be formed between the battery and the auxiliary protection structure outside the battery, which is also helpful for heat dissipation of the battery.

[0112] Furthermore, the boss portion 132 may be provided with one or more boss portions 132 , and both of these two configurations do not affect the heat dissipation effect of the airflow channel 133 and the flow diversion effect of the spray from the explosion-proof valve.

[0113] Specifically, Figures 1 to 5 As shown, in some embodiments, only one boss portion 132 is provided on the third side plate 130, and the boss portion 132 is located on a side of the third side plate 130 close to the first side plate 110, that is, the air flow channel 133 and the boss portion 132 are arranged side by side in the second direction, and both occupy the entire area of ​​the third side plate 130, wherein the second direction is the width direction of the third side plate 130 (that is, as shown in FIG. Figure 1 y direction shown).

[0114] In some embodiments, two air flow channels 133 are provided on the third side plate 130. Fig. 9 A schematic diagram of the exploded structure of a battery housing provided in another embodiment of the present application is shown in FIG. Fig. 9 As shown, the first air flow channel 133 is located between the boss portion 132 and the first side plate 110 , and the second air flow channel 133 is located between the boss portion 132 and the second side plate 120 .

[0115] Further, in some embodiments, the third side plate 130 includes a first end and a second end opposite to each other in the first direction, and the boss portion 132 extends from the first end of the third side plate 130 to the second end of the third side plate 130; wherein the first direction (such as Figure 1 The z direction shown in the figure is the length direction of the third side plate 130 .

[0116] In the above structure, the position of the airflow channel 133 depends on the setting position of the boss portion 132, and the airflow channel 133 is surrounded by the side plate of the boss portion 132 and the plate body 131. When the boss portion 132 extends along the length direction of the third side plate 130, the airflow channel 133 also extends along the length direction of the third side plate 130.

[0117] It should be noted that the overlapping area 601 can be located in the airflow channel 133. Even if it is located in the airflow channel 133, the space in the airflow channel 133 will not be filled up. There is still a large enough space between the overlapping area 601 and the outer surface of the boss portion 132 for heat dissipation or circulation of the explosion-proof valve ejection, so as to ensure that the airflow channel 133 achieves the corresponding effect.

[0118] Exemplarily, the thickness of the overlapping region 601 is less than 0.5 mm, and the distance between the overlapping region 601 and the outer surface of the boss portion 132 is 0.5 mm. Figures 12 to 16 As shown, in some embodiments, the battery module 20 also includes a flame retardant plate 800, which is arranged on the side of the battery pack 700 with the explosion-proof valve 300, and an exhaust hole 811 is arranged on the flame retardant plate 800, and the explosion-proof valve 300 of each single battery is connected to the exhaust hole 811.

[0119] In the above structure, the flame retardant plate 800 is made of flame retardant material, which can play a flame retardant effect when the battery pack 700 is in thermal runaway, reduce the spread of thermal runaway, and thus ensure the safety of the battery pack.

[0120] The exhaust hole 811 can discharge solids, liquids, gases, etc. ejected from the explosion-proof valve in a timely manner, thereby preventing the ejected materials from accumulating between the flame-retardant plate 800 and the battery pack 700, and ensuring the safety of the battery module.

[0121] It should be noted that the flame retardant plate 800 can be made of non-metallic materials such as foam, plastic, silicone, rubber, etc., preferably plastic, silicone or rubber.

[0122] Specifically, a plurality of exhaust holes 811 may be provided, and the plurality of exhaust holes 811 are provided in one-to-one correspondence with the plurality of explosion-proof valves 300 to ensure that the substances sprayed from the explosion-proof valves can be discharged in time.

[0123] Of course, the exhaust hole can be a long hole set on the bottom plate, which is connected to multiple explosion-proof valves through a long hole, so that solids, liquids, gases, etc. sprayed from the explosion-proof valves can be discharged in time, ensuring the safety of the battery module.

[0124] like Figures 12 to 16 As shown, in some embodiments, the flame retardant plate 800 includes a bottom plate 810 and a limiting rib 820 arranged on the bottom plate 810, the exhaust hole 811 is arranged on the bottom plate 810, the limiting rib 820 is limitedly matched with the end cover 200 of multiple single cells, and the limiting rib 820 is provided with an exhaust notch 821, and the exhaust notch 821 is arranged opposite to the airflow channel 133.

[0125] In the above structure, the limiting rib 820 can limit the battery pack 700 to reduce the probability of the battery pack 700 moving on the flame retardant plate 800. The limiting rib 820 is provided with an exhaust notch 821, which is arranged opposite to the airflow channel 133, so that the limiting rib 820 will not block the material discharged from the airflow channel 133, so that the material sprayed from the explosion-proof valve can be discharged smoothly.

[0126] Specifically, the limiting ribs 820 may be provided in plurality. When the limiting ribs 820 are limitedly matched with the end caps 200 of the single cell, exhaust notches 821 need to be provided on the limiting ribs 820 to ensure the fluidity of the air flow channel 133. When the limiting ribs 820 are limitedly matched with the non-end cap surface of the single cell, exhaust notches do not need to be provided on the limiting ribs.

[0127] In some embodiments, an exhaust groove 812 is further provided on the bottom plate 810, and the bottom wall of the exhaust groove 812 is lower than the surface of the bottom plate 810 facing the battery pack. At least one end of the exhaust groove 812 passes through the edge of the bottom plate 810, and the exhaust hole 811 is provided in the exhaust groove. The exhaust groove 812 can guide the ejecta discharged from the explosion-proof valve 300, so that the ejecta can be discharged along the exhaust groove to the outside of the flame retardant plate 800, thereby avoiding the ejecta from accumulating between the flame retardant plate 800 and the battery pack 700, causing more serious safety accidents.

[0128] 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, or it can be 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.

[0129] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 should not be understood as a limitation on the present application.

[0130] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0131] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0132] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A battery, characterized in that: The battery comprises a housing, the housing comprising: A shell body, surrounded by a plurality of side panels, wherein the shell body has a containing space; an end cover, the end cover being disposed on at least one end of the shell and closing the accommodation space, and the end cover being provided with an electrode structure; An explosion-proof valve is arranged on the side plate; The side plate where the explosion-proof valve is located includes a plate body and a boss portion protruding from the surface of the plate body, the boss portion extends from the first end of the side plate to the second end of the side plate along a first direction, and the explosion-proof valve is arranged on the boss portion.

2. The battery according to claim 1, characterized in that The shell comprises a first side plate and a second side plate which are arranged opposite to each other, and a third side plate and a fourth side plate which are arranged between the first side plate and the second side plate, wherein the first side plate, the second side plate, the third side plate and the fourth side plate surround the shell and form a receiving space; The area of ​​the first side plate is greater than that of the third side plate, and the boss portion is disposed on the third side plate.

3. The battery according to claim 2, characterized in that The third side plate comprises a first end and a second end opposite to each other in a first direction, and the boss portion extends from the first end of the third side plate to the second end of the third side plate; Wherein, the first direction is the length direction of the third side plate.

4. The battery according to claim 3, characterized in that The boss portion is located on a side of the third side plate close to the first side plate; or, The boss portion is disposed at the center of the third side plate in a second direction, wherein the second direction is a width direction of the third side plate.

5. The battery according to any one of claims 1 to 4, characterized in that The boss portion is arranged on the surface of the side plate facing away from the accommodation space; or, The boss portion is disposed on a surface of the side plate facing the accommodation space.

6. The battery according to any one of claims 2 to 4, characterized in that The thickness of the plate body is T1, the overall thickness of the plate body and the boss portion is T2, and T1 and T2 satisfy: T1<T2≤1.5mm; and / or, The width of the boss portion is W1, the width of the third side plate is W2, and W1 and W2 satisfy: 0.15<W1 / W2≤0.85; and / or, The area of ​​the third side plate is S1, the projection area of ​​the boss portion on the third side plate is S2, the surface area of ​​the shell is S3, and S1, S2 and S3 satisfy: 0.15<S2 / S1<0.85, and 0<S2 / S3<0.

4.

7. The battery according to any one of claims 1 to 4, characterized in that The circumferential edge of the end cover is conformally matched with the circumferential side wall of the shell, the end cover is welded to the shell to form a weld, and a distance H2 is provided between the weld and the outer surface of the boss portion, and H2 is between 0.1 mm and 5 mm.

8. The battery according to any one of claims 1 to 4, characterized in that The battery further comprises an outer envelope wrapped around the axially outer side of the shell, the outer envelope having a starting end and a terminating end, the starting end and the terminating end having an overlapping area, and the overlapping area is located on the surface of the plate body.

9. A battery module, characterized in that: The invention comprises a battery pack, wherein the battery pack comprises a plurality of single cells arranged along a second direction, and the single cells are the battery according to any one of claims 1 to 8.

10. The battery module according to claim 9, characterized in that: An air flow channel is formed between the side wall of the boss portion of the single battery and the surface of the plate body, and the battery module further comprises: A flame retardant plate, the flame retardant plate comprising a bottom plate and a limiting rib arranged on the bottom plate, the limiting rib being limitedly matched with the battery pack, the limiting rib being limitedly matched with the end cover of the single battery being provided with an exhaust notch, the exhaust notch being arranged opposite to the air flow channel; The bottom plate is provided with an exhaust hole, and the explosion-proof valve of the single battery is connected to the exhaust hole.

11. The battery module according to claim 10, characterized in that: The bottom plate is also provided with an exhaust groove, the bottom wall of which is lower than the bottom plate and faces the surface of the battery pack, at least one end of the exhaust groove passes through the edge of the bottom plate, and the exhaust hole is provided in the exhaust groove.

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