EXPLOSION-PROOF VALVE, BATTERY, BATTERY MODULE, BATTERY PACK AND VEHICLE

An explosion-proof valve includes a valve body that includes a connection section at an edge of the valve body and a scored groove, and an opening region on a radial inner side of the connection section. A shape of an orthographic projection of the valve body and a shape of an orthographic projection of the opening region in a depth direction of the scored groove are non-circular. An outer edge of the orthographic projection of the opening region is an opening boundary. An area of the orthographic projection of the opening region is Sopen, an area of an orthographic projection of the connection section is g Sconnect, and an area of the orthographic projection of the valve body is Stotal, where Sopen, Sconnect, and Stotal meeting: 10%<Sconnect/(Stotal−Sopen)<65%.

FIELD

The present disclosure relates to the technical field of batteries, and particularly to an explosion-proof valve, a battery, a battery module, a battery pack, and a vehicle.

BACKGROUND

In the related art, an explosion-proof valve of a battery is usually welded to a cover plate of the battery. When the gas pressure in the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve is opened to release the gas generated inside the battery, thereby preventing accidents such as explosion of the battery. However, when the pressure in the battery changes and becomes too high, unstable welding of the explosion-proof valve to the battery is likely to cause the entire explosion-proof valve to fall off from the battery during the pressure relief, affecting the safety of the battery and the entire battery system.

SUMMARY

The present disclosure resolves at least one of the technical problems in the related art. Therefore, a first aspect of the present disclosure is to provide an explosion-proof valve, which can effectively improve the connection stability and the connection strength of the connection section of the explosion-proof valve. When the explosion-proof valve is applied to a battery, the safety of the battery and the entire battery system are ensured.

A second aspect of the present disclosure is to provide a battery using the explosion-proof valve.

A third aspect of the present disclosure is to provide a battery module using the battery.

A fourth aspect of the present disclosure is to provide a battery pack using the battery module or the battery.

A fifth aspect of the present disclosure is to provide a vehicle using the battery pack.

An embodiment of a first aspect of the present disclosure provides an explosion-proof valve, includes a valve body that includes a connection section at an edge of the valve body and a scored groove, and an opening region on a radial inner side of the connection section. A shape of an orthographic projection of the valve body and a shape of an orthographic projection of the opening region in a depth direction of the scored groove are non-circular. An outer edge of the orthographic projection of the opening region is an opening boundary. An area of the orthographic projection of the opening region is Sopen, an area of an orthographic projection of the connection section is g Sconnect, and an area of the orthographic projection of the valve body is Stotal, where Sopen, Sconnect, and Stotalmeeting: 10%<Sconnect/(Stotal−Sopen)<65%.

According to the explosion-proof valve of the embodiment of the present disclosure, by configuring Sopen, Sconnect, and Stotalto meet 10%<Sconnect/(Stotal−Sopen)<65%, the accurate configuration of parameters of the explosion-proof valve can effectively improve the connection stability and the connection strength of the connection section of the explosion-proof valve. When the explosion-proof valve is applied to a battery, a stable connection between the explosion-proof valve and the battery can be effectively ensured, so that the opening region can be smoothly opened during the pressure relief of the battery, thereby effectively avoiding the problem in the related art that the explosion-proof valve is completely blown open to affect the safety of the battery due to the weak connection strength of the explosion-proof valve. In other words, with the use of the explosion-proof valve according to the embodiment of the present disclosure, the safety of the battery and the entire battery system can be effectively ensured.

In some examples, the shape of the orthographic projection of the opening region in the depth direction of the scored groove is oblong; the scored groove includes two first straight line segments in parallel and two first arc segments, two ends of each of the first straight line segments are respectively connected to the two first arc segments, and the two first straight line segments and the two first arc segments form a closed annular structure; and an outer edge of the orthographic projection of the scored groove in the depth direction of the scored groove form the opening boundary.

In some examples, a length of each of the first straight line segments is a, and a distance between outer sides of the two first straight line segments is b, where Sopen, a, and b meet: Sopen=a×b+πb2/4, 10 mm≤a≤50 mm, and 3 mm≤b≤30 mm.

In some examples, the scored groove includes two first scored segments disposed oppositely and in an arc shape, a second scored segment in a straight shape, and two third scored segments spaced apart from each other and being a straight line, the second scored segment is disposed in parallel with the third scored segments, two ends of the second scored segment are respectively connected to the two first scored segments, and each of the third scored segments is connected to the corresponding first scored segment; and in the depth direction of the scored groove, the outer edge of the orthographic projection of the scored groove and a line connecting two open ends of the orthographic projection of the scored groove defining the opening boundary.

In some examples, the scored groove includes a fourth scored segment being a straight line and four fifth scored segments being a straight line, and each of two ends of the fourth scored segment is connected to two fifth scored segments at an angle α; and in the depth direction of the scored groove, one of two fourth arc lines connects open ends of orthographic projections of the two fifth scored segments at a same end of the fourth scored segment, the fourth arc line is centered at a vertex of the angle α, one of two fourth straight lines connects the open ends of the orthographic projections of the two fifth scored segments on a same side of the fourth scored segment, and the two fourth arc lines and the two fourth straight lines define the opening boundary.

In some examples, in the depth direction of the scored groove, an outer peripheral edge of the orthographic projection of the connection section includes two second straight line segments disposed in parallel and two second arc segments, two ends of each of the second straight line segments are respectively connected to the two second arc segments, and the two second straight line segments and the two second arc segments form a closed annular structure; and in the depth direction of the scored groove, the outer peripheral edge of the orthographic projection of the connection section is an outer peripheral edge of the orthographic projection of the valve body.

In some examples, a length of each of the second straight line segments is A, and a distance between the two second straight line segments is B, where Stotal, A, and B meet: Stotal=A×B+B2/4, 10 mm≤A≤70 mm, and 10 mm≤B≤60 mm.

In some examples, the connection section is an elongated ring shape extending in a circumferential direction of the valve body, an inner peripheral edge of the orthographic projection of the connection section in the depth direction of the scored groove includes two third straight line segments disposed in parallel and two third arc segments, two ends of each of the third straight line segments are respectively connected to the two third arc segments, and a distance between the two third straight line segments is B1, where Sconnectand B1meet: Sconnect=Stotal−πB12/4−B1×A, and 9 mm≤B1≤59 mm.

In some examples, the valve body has an elliptical or racetrack shape.

An embodiment of a second aspect of the present disclosure provides a battery, including the explosion-proof valve according to the embodiment of the first aspect of the present disclosure.

In some examples, an energy density E of the battery meets: 170 wh/kg≤E≤190 wh/kg.

An embodiment of a third aspect of the present disclosure provides a battery module, including the battery according to the embodiment of the second aspect of the present disclosure.

An embodiment of a fourth aspect of the present disclosure provides a battery pack, including the battery according to the embodiment of the second aspect or the battery module according to the embodiment of the third aspect of the present disclosure.

An embodiment of a fifth aspect of the present disclosure provides a vehicle, including the battery according to the embodiment of the second aspect of the present disclosure or the battery pack according to the embodiment of the fourth aspect of the present disclosure.

Additional aspects and advantages of the present disclosure will be given and be apparent from the description below, or understood through practice of the present disclosure.

In the drawings:valve body100;connection section10; second straight line segment11; second arc segment12; third straight line segment13; third arc segment14;opening region20; predetermined opening boundary201; scored groove21; first straight line segment211; first arc segment212; first scored segment213; second scored segment214; third scored segment215; connecting line216; fourth scored segment217; fifth scored segment218; fourth arc line219; fourth straight line220;explosion-proof valve200; battery300; battery module400; battery pack500; and vehicle600.

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described in detail below. The embodiments described with reference to the accompanying drawings are merely examples. An explosion-proof valve200according to the embodiments of the present disclosure will be described below with reference toFIG.1toFIG.3. The following description of the present disclosure is given with reference to an example where the explosion-proof valve200is mounted on a battery300. When the internal pressure of the battery300increases, the explosion-proof valve200is configured to relieve the pressure in the battery300.

As shown inFIG.1, an embodiment of a first aspect of the present disclosure provides an explosion-proof valve200, including an valve body100.

In some embodiments, a scored groove21is provided on the valve body100. A shape of an orthographic projection of the valve body100in a depth direction of the scored groove21(i.e., a direction from a groove top to a groove bottom of the scored groove21) is non-circular. By such a configuration, the non-circular valve body100can better match a housing of the battery300or a cover plate of the battery300which may be in different shapes. The valve body100has a connection section10at an edge thereof. When the explosion-proof valve200is mounted on the battery300, the explosion-proof valve200may be fixedly connected to the housing of the battery300or the cover plate of the battery300through the connection section10. When the valve body100is fixed to the housing of the battery300by welding, a welding seam is formed between the valve body100and the housing. In some embodiments, when the valve body100is fixed to the cover plate of the battery300by welding, a welding seam is formed between the valve body100and the cover plate. An outer peripheral edge of the valve body100is at one-half a width of the welding seam. The width of the welding seam is a distance between an outer contour and an inner contour of an orthographic projection of the welding seam in the depth direction of the scored groove21. In the depth direction of the scored groove21, an overlapping portion of the orthographic projection of the welding seam and the orthographic projection of the valve body100is an orthographic projection of the connection section. In other words, an outer peripheral edge of the connection section10coincides with the outer peripheral edge of the valve body100, and an inner peripheral edge of the connection section10coincides with an inner peripheral edge of the welding seam. The “inner peripheral edge of the welding seam” is an edge of one side of the welding seam close to a center of the explosion-proof valve200.

The valve body100has an opening region20. A shape of an orthographic projection of the opening region20in the depth direction of the scored groove21is non-circular. For example, the shape of the orthographic projection of the opening region20may be the same as the shape of the orthographic projection of the valve body100. An outer edge of the orthographic projection of the opening region20is a predetermined opening boundary201. The scored groove21on the valve body100may extend along the predetermined opening boundary201. The opening region20is located on a radial inner side of the connection section10. When the internal pressure of the battery300increases, the pressure can be smoothly relieved through the explosion-proof valve200to protect the battery300. In the depth direction of the scored groove21, an area of the orthographic projection of the opening region20is defined as Sopen, an area of the orthographic projection of the connection section10is defined as Sconnect, and an area of the orthographic projection of the valve body100is defined as Stotal. Sopen, Sconnectand Stotalmeet: 10%<Sconnect/(Stotal−Sopen)<65%, and Sopen, Sconnect, and Stotalbeing measured in mm2.

For example, when Sconnect/(Stotal−Sopen)≤10% and Stotalremains unchanged, at least one of Sconnectand Sopenis relatively small, which may lead to a decrease in the stability of connection between the explosion-proof valve200and the battery300, and is not conducive to the smooth opening of the opening region20. When Sconnect/(Stotal−Sopen)≥65% and Stotalremains unchanged, at least one of Sconnectand Sopenis relatively large, which may lead to an unduly high strength of the connection section10and a waste of materials, or may lead to a large area of the opening region20and affect the opening performance of the opening region20. Therefore, by defining the ratio of the area of the orthographic projection of the connection section10to an area of the orthographic projection of the explosion-proof valve200other than the opening region20to be 10% to 65%, the connection strength of the connection section10and the opening performance of the opening region20can both be ensured, and the degree of stability of the explosion-proof valve200can be determined more accurately.

It can be understood that the larger the value of Sconnect/(Stotal−Sopen), the higher the connection strength between the connection section10and the battery300, and the better the stability of the explosion-proof valve200. For example, the value of Sconnect/(Stotal−Sopen) may be increased by increasing Sconnect, or increasing Sopen, or increasing both Sconnectand Sopen.

According to the explosion-proof valve200of the embodiment of the present disclosure, by configuring Sopen, Sconnect, and Stotalto meet 10%<Sconnect/(Stotal−Sopen)<65%, the accurate configuration of parameters of the explosion-proof valve200can effectively improve the connection stability and the connection strength of the connection section10of the explosion-proof valve200. When the explosion-proof valve200is applied to the battery300, a stable connection between the explosion-proof valve200and the battery300can be effectively ensured, so that the opening region20can be smoothly opened during pressure relief of the battery300, thereby effectively avoiding the problem in the related art that the explosion-proof valve200is completely blown open due to the weak connection strength of the explosion-proof valve200, and therefore avoiding the impact on the safety of the battery300. In other words, with the use of the explosion-proof valve200according to the embodiment of the present disclosure, the safety of the battery300and the entire battery system can be effectively ensured.

In some embodiments, 80 mm2≤Sopen≤1600 mm2, and 178.5 mm2≤Stotal≤5212.5 mm2. Such a configuration not only can ensure that the explosion-proof valve200has an adequate pressure relief capability, but also can ensure the stability of connection between the explosion-proof valve200and the housing of the battery300or the cover plate of the battery300.

According to some embodiments of the present disclosure, referring toFIG.1, the shape of the orthographic projection of the opening region20in the depth direction of the scored groove21may be oblong. Such a configuration can better match the explosion-proof valve200and can also match the shape of the housing or the cover plate (not shown) of the battery300using the explosion-proof valve200. In addition, compared with a circular explosion-proof valve200, the oblong opening region20can discharge a larger amount of gas per unit time, thereby providing a better pressure relief effect. The scored groove21includes two first straight line segments211arranged in parallel and two first arc segments212arranged oppositely. Two ends of each of the two first straight line segments211are respectively connected to the two first arc segments212, so that the scored groove21can form a closed annular structure. An outer edge of the orthographic projection of the scored groove21in the depth direction of the scored groove21constitutes the predetermined opening boundary201. That is, an area of a region defined by outer edges of the two first straight line segments211and the two first arc segments212is the area of the orthographic projection of the opening region20.

A length of each of the first straight line segments211is defined as a, and a distance between outer sides of the two first straight line segments211is defined as b, where Sopen, a, and b meet: Sopena×b+πb2/4, 10 mm≤a≤50 mm, and 3 mm≤b≤30 mm. For example, a=30 mm, and b=10 mm. However, the present disclosure is not limited thereto. Therefore, by defining the dimensions a and b, the safety of the battery300using the explosion-proof valve200is improved while ensuring that the opening region20can be smoothly opened and the pressure can be relieved in a timely manner. It can be understood that the outer side of the first straight line segment211is the side of the first straight line segment211away from the center of the explosion-proof valve200.

A cross section of the scored groove21may be rectangular or inverted trapezoidal. “Cross-section” herein refers to a plane parallel to the depth direction of the scored groove21. When the cross-section of the scored groove21is inverted trapezoidal, the width of the scored groove21gradually decreases toward the groove bottom of the scored groove21. In this case, a may be understood as a length of an outer edge of the first straight line segment211at the groove top or opening, and b may be understood as a diameter of an outer edge of the first arc segment212at the groove top or opening. In other words, in the depth direction of the scored groove21(i.e., in the direction from the groove top to the groove bottom of the scored groove21), the outer edge of the orthographic projection of the scored groove21includes two opposing semicircles, b may be understood as a diameter of the semicircles, and a may be understood as a distance between centers of the two semicircles.

In some embodiments, as shown inFIG.2, the scored groove21is a C-shaped scored groove. The scored groove21includes two first scored segments213arranged oppositely and in an arc shape, a second scored segment214being a straight line, and two third scored segments215spaced apart from each other and being a straight line. The second scored segment214is arranged in parallel with the third scored segments215. Two ends of the second scored segment214are respectively connected to the two first scored segments213. Each of the third scored segments215is connected to the corresponding first scored segment213. In other words, the second scored segment214is connected to one end of each of the two first scored segments213, and the other end of each of the two first scored segments213is respectively connected to one third scored segment215, and the two third scored segments215are spaced apart from each other. In the depth direction of the scored groove21, a connecting line216between the two free/open ends of the outer edge of the orthographic projection of the scored groove21, and the outer edge of the orthographic projection of the scored groove21jointly constitute/define the predetermined opening boundary201. In this case, an area of a region defined within the predetermined opening boundary201(i.e., the area of the orthographic projection of the opening region20in the depth direction of the scored groove21) is defined as Sc, and Sc=a1×b1+π×b12/4. A total length of the scored groove21is defined as Lc, and Lc=2a1−c1+πb1. a1represents a length of the second scored segment214, b1represents a distance between an outer side of the second scored segment214and an outer side of the third scored segment215, and c1represents a distance between the two third scored segments215. c1is a length of the connecting line216.

A cross section of the scored groove21may be rectangular or inverted trapezoidal. “Cross-section” herein refers to a plane parallel to the depth direction of the scored groove21. When the cross-section of the scored groove21is inverted trapezoidal, the width of the scored groove21gradually decreases toward the groove bottom of the scored groove21. In this case, a1may be understood as a length of an outer edge of the second scored segment214at the groove top or opening, and b1may be understood as a diameter of an outer edge of the first scored segment213at the groove top or opening. In other words, in the depth direction of the scored groove21(i.e., in the direction from the groove top to the groove bottom of the scored groove21), the outer edge of the orthographic projection of the scored groove21includes two opposing semicircles, b1may be understood as a diameter of the semicircles, and a1may be understood as a distance between centers of the two semicircles.

In some other embodiments, as shown inFIG.3, the scored groove21is a double Y-shaped scored groove. The scored groove21includes a fourth scored segment217being a straight line and four fifth scored segments218being a straight line. Each of two ends of the fourth scored segment217is connected to two fifth scored segments218arranged at a preset angle. The preset angle is α. In the depth direction of the scored groove21, a fourth arc line219is defined between free/open ends of orthographic projections of the two fifth scored segments218at the same end of the fourth scored segment217. The fourth arc line219is centered at a vertex of the preset angle (i.e., α). In the depth direction of the scored groove21, a fourth straight line220is defined between the free ends of the orthographic projections of the two fifth scored segments218on the same side of the fourth scored segment217. The two fourth arc lines219and the two fourth straight lines220jointly constitute/define the predetermined opening boundary201.

It should be noted that because widths of the fourth scored segment217and the fifth scored segment218are relatively small and can be ignored, the fourth arc line219and the fourth straight line220approximately intersect at one point. The fourth arc line219may be understood as being defined by free ends E at opposing sides of the orthographic projections of the two fifth scored segments218located at the same end of the fourth scored segment217. The fourth straight line220may be understood as being defined by free ends F at opposing sides of the orthographic projections of the two fifth scored segments218located on the same side of the fourth scored segment217. For example, in the example ofFIG.3, the “fourth arc line219” refers to: an arc between the free ends E of the two fifth scored segments218located at a left end of the fourth scored segment217, and an arc between the free ends E of the two fifth scored segments218located at a right end of the fourth scored segment217. The “fourth straight line220” refers to: a straight line between the free ends F of the two fifth scored segments218located on an upper side of the fourth scored segment217, and a straight line between the free ends F of the two fifth scored segments218located on a lower side of the fourth scored segment217.

In some embodiments, the free ends E of the two fifth scored segments218located at the same end of the fourth scored segment217refer to: free end points at opposing sides of the two fifth scored segments218located at the same end of the fourth scored segment217. The free ends F of the two fifth scored segments218located on the same side of the fourth scored segment217refer to: free end points at opposing sides of the two fifth scored segments218located on the same side of the fourth scored segment217. As shown inFIG.3, in a direction from left to right, the two fifth scored segments218at a left end of the fourth scored segment217are close to each other to connect to the fourth scored segment217, and the two fifth scored segments218at a right end of the fourth scored segment217extend away from each other. In this case, an area of a region defined within the predetermined opening boundary201(i.e., the area of the orthographic projection of the opening region20in the depth direction of the scored groove21) is defined as

and a total length of the scored groove21is Ldouble-y=a2+4c2. a2represents a length of the fourth scored segment217, b2represents a distance between the free ends of the two fifth scored segments218located on the same side of the fourth scored segment217, and c2represents a length of the fifth scored segment218.

Therefore, the scored groove21of different shapes can change the structural strength of the opening region20. A suitable scored groove21may be selected according to different design standards, thereby reducing the difficulty of the manufacturing process of the explosion-proof valve200, increasing the pressure relief speed of the explosion-proof valve200, and improving the safety performance of the battery300. For example, when the internal pressure of the battery300increases, the internal pressure of the battery300will squeeze the opening region20outward, which is likely to deform the opening region20. The C-shaped scored groove or the double Y-shaped scored groove can increase the deformation of the opening region20to a certain extent to relatively improve the structural strength of the opening region20, thereby effectively preventing unintentional opening of the explosion-proof valve200.

Further, a cross section of the scored groove21may be rectangular or inverted trapezoidal. “Cross-section” herein refers to a plane parallel to the depth direction of the scored groove21. When the cross-section of the scored groove21is inverted trapezoidal, the width of the scored groove21gradually decreases toward the groove bottom of the scored groove21. In this case, a2may be understood as a length of an outer edge of the fourth scored segment217at the groove top or opening, b2may be understood as a distance between free ends, which are at the groove top or opening, of the two fifth scored segments218located on the same side of the fourth scored segment217, and c2may be understood as a length of an outer edge of the fifth scored segment218at the groove top or opening.

In some embodiments, as shown inFIG.1, in the depth direction of the scored groove21, an outer peripheral edge of the orthographic projection of the connection section10includes two second straight line segments11arranged in parallel and two second arc segments12arranged oppositely. Two ends of each of the second straight line segments11are respectively connected to the two second arc segments12. The two second straight line segments11and the two second arc segments12constitute a closed annular structure. In the depth direction of the scored groove21, the outer peripheral edge of the orthographic projection of the connection section10is an outer peripheral edge of the orthographic projection of the valve body100. A length of each of the second straight line segments11is defined as A, and a distance between the two second straight line segments11is defined as B. The two second straight line segments11and the two second arc segments12jointly define a closed area. An area of the closed area (i.e., the area Stotalof the orthographic projection of the valve body100) may include two semicircles having a radius of ½ B and a rectangle having a length A and a width B.

Stotal, A, and B meet: Stotal=A×B+πB2/4, 10 mm≤A≤70 mm, and 10 mm≤B≤60 mm. Therefore, by defining the dimensions of A and B of the valve body100to be within the above ranges, the value of the area Stotalof the orthographic projection of the valve body100in the depth direction of the scored groove21can be controlled within a reasonable range, to adapt to batteries300of different sizes and facilitate the manufacturing of the valve body100. For example, A=50 mm, and B=30 mm. However, the present disclosure is not limited thereto.

Further, referring toFIG.1, the connection section10is an elongated ring shape extending in a circumferential direction of the valve body100, and the outer peripheral edge of the connection section10is the outer peripheral edge of the valve body100. An inner peripheral edge of the orthographic projection of the connection section10in the depth direction of the scored groove21includes two third straight line segments13arranged in parallel and two third arc segments14arranged oppositely. Two ends of each of the third straight line segments13are respectively connected to the two third arc segments14. A distance between the two third straight line segments13is defined as B1. Sconnectand B1meet: Sconnect=Stotal−πB12/4−B1×A, and 9 mm≤B1≤59 mm. In other words, the area Sconnectof the connection section10may be a difference between an area defined by a boundary surrounded by the two second straight line segments11and the two second arc segments12and an area defined by a boundary surrounded by the two third straight line segments13and the two third arc segments14.

If B1<10 mm, the area Sconnectof the connection section10increases, and the area Sopenof the opening region20may not be ensured, which may affect the normal pressure relief of the explosion-proof valve200. If B1>60 mm, the area Sconnectof the connection section10decreases, which may reduce the connection stability of the connection section10. When the internal pressure of the battery300is too high, the entire explosion-proof valve200is likely to be blown open, affecting the safety of the battery300and the entire battery system. Therefore, by configuring Sconnect=Stotal−πB12/4−B1×A and defining the value range of B1, the area of the connection section10can be within a suitable range, thereby ensuring the normal pressure relief of the explosion-proof valve200while increasing the connection strength of the connection section10.

In some embodiments, the valve body100may be configured to be elliptical or racetrack-shaped. Therefore, the explosion-proof valve200can better adapt to the shape of the housing of the battery300or the shape of the cover plate of the battery300, increase the amount of gas discharged per unit time, and improve the pressure relief performance of the explosion-proof valve200.

An embodiment of a second aspect of the present disclosure provides a battery300, which, as shown inFIG.4, includes the explosion-proof valve200according to the embodiment of the first aspect.

In some embodiments, the battery300further includes a housing (not shown) and a cover plate (not shown). At least one end of the housing is open for mounting the cover plate. A mounting hole (not shown) is formed in the housing or the cover plate, and the explosion-proof valve200is connected at the mounting hole. The connection section10of the explosion-proof valve200may be connected to the housing or the cover plate by welding.

According to the battery300of the embodiment of the present disclosure, with the use of the explosion-proof valve200, a reliable connection between the explosion-proof valve200and the battery300and a good pressure relief capability can both be achieved, and the usage safety of the battery300can be improved.

In some embodiments, an energy density of the battery300is defined as E. E meets: 170 wh/kg≤E≤190 wh/kg. For example, E=180 wh/kg. However, the present disclosure is not limited thereto. Therefore, the energy density of the battery300is increased, and the overall performance of the battery300is improved. Moreover, the greater the energy of the battery300, the larger the amount of active material or the higher the activity of material is required inside the battery300. Such a battery300requires a more accurate configuration of the amount of gas discharged through the explosion-proof valve200, so as to allow timely opening of the explosion-proof valve200in extreme cases, and avoid unintentional starting. The explosion-proof valve200of the above embodiment of the present disclosure can well meet this requirement.

An embodiment of a third aspect of the present disclosure provides a battery module400, which, as shown inFIG.4, includes the battery300according to the embodiment of the second aspect. For example, the battery module400may include a plurality of batteries300arranged side by side. The battery module400may further include two end plates (not shown) and two side plates (not shown). The two end plates are distributed at two ends of each of the plurality of batteries300in a first direction. The two side plates are distributed at two sides of each of the plurality of batteries300in a second direction. The end plates and the side plates are fixedly connected to fix the batteries300. The first direction is perpendicular to the second direction. Of course, in other embodiments, the battery module400may further include two end plates and a cable tie (not shown), and the two end plates are distributed at two ends of each of the plurality of batteries300and fixed by the cable tie.

With the use of the battery300in the battery module400of the embodiment of the present disclosure, the usage safety of the battery module400is improved.

An embodiment of a fourth aspect of the present disclosure provides a battery pack500, which, as shown inFIG.4andFIG.5, includes the battery300according to the embodiment of the second aspect or the battery module400according to the embodiment of the third aspect.

With the use of the battery300or the battery module400in the battery pack500of the embodiment of the present disclosure, the usage safety of the battery pack500can be improved. For example, the battery pack500may include a tray (not shown), and the battery300or the battery module400is fixed in the tray. When the battery pack500is applied to a vehicle600, the battery pack500is mounted on the vehicle600through the tray.

An embodiment of a fifth aspect of the present disclosure provides a vehicle600, which, as shown inFIG.4toFIG.6, includes the battery300according to the embodiment of the second aspect or the battery pack500according to the embodiment of the fourth aspect. For example, in some embodiments, the battery300may be directly mounted on the vehicle600. In some other embodiments, the battery300is assembled into a battery pack500, and the battery pack500is mounted on the vehicle600.

With the use of the battery pack500in the vehicle600of the embodiment of the fifth aspect of the present disclosure, the usage safety of the vehicle600can be improved.

In some embodiments, the explosion-proof valve200may be arranged to face downward to prevent the discharged high-temperature gas from injuring occupants inside the vehicle600.

In the description of the present disclosure, it should be understood that orientation or position relationships indicated by the terms such as “center”, “length”, “width”, “thickness”, “on”, “below”, “horizontal”, “top”, “bottom”, “inner”, and “outer” are based on orientation or position relationships shown in the accompanying drawings, and are used only for ease and brevity of illustration and description, rather than indicating or implying that the mentioned apparatus or component need to have a particular orientation or need to be constructed and operated in a particular orientation. Therefore, such terms should not be construed as limiting of the present disclosure.

In the description of the present disclosure, “first feature” and “second feature” may include one or more features. In the description of the present disclosure, “multiple” and “a plurality of” mean two or more. In the description of the present disclosure, a first feature being “over” or “below” a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are not in direct contact but are in contact through another feature therebetween. In the description of the present disclosure, the first feature being “over”, “above”, and “on” the second feature includes that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than the horizontal height of the second feature.

In the description of the specification, the description with reference to the terms “an embodiment”, “some embodiments”, “exemplary embodiments”, “example”, “specific example”, or “some example” and so on means that specific features, structures, materials or characteristics described in connection with the embodiment or example are embraced in at least one embodiment or example of the present disclosure. In this specification, examples of descriptions of the foregoing terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present disclosure have been shown and described, a person of ordinary skill in the art should understand that various changes, modifications, replacements and variations may be made to the embodiments without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is as defined by the appended claims and their equivalents.