Batteries, battery modules, battery packs, and vehicles

Abstract

A vehicle having a battery pack. The battery pack comprises a battery or a battery module. The battery pack comprises a battery shell and an explosion-proof valve. The explosion-proof valve is disposed in the battery shell, is provided with a notch groove, and has an opening area. In a depth direction of the notch groove, an outer edge of the orthogonal projection of the opening area is a predetermined opening boundary, and an area of ​​the orthogonal projection of the opening area is S1, where S1 is in mm 2 and the capacity of the battery is A, where A is in Ah. If the positive electrode material of the battery is a compound having an olivine structure, S1 and A satisfy S1>0.5A. If the positive electrode material of the battery includes a layered compound, S1 and A satisfy S1>1.2A.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to and the benefit of Chinese Patent Application No. 202210512549.3 entitled "BATTERY, BATTERY MODULE, BATTERY PACK, AND VEHICLE," filed on May 12, 2022 by BYD Co., Ltd. The entire contents of the above-referenced application are hereby incorporated by reference.

[0002] The present disclosure relates to the field of battery technology, and in particular to batteries, battery modules, battery packs, and vehicles. [Background technology]

[0003] In the related art, the explosion-proof valve of a battery (e.g., a lithium-ion battery) is designed to be opened in a timely manner to release pressure when the battery is overused or the air pressure inside the battery is increased, thereby preventing safety problems such as battery fire or explosion. However, during practical application, if the internal pressure of the battery is not released in a timely manner or the pressure release speed is not fast enough, safety accidents such as battery fire or explosion will be caused. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure is intended to solve at least one of the technical problems existing in the related art. Therefore, an object of the present disclosure is to provide a battery and improve the use safety of the battery.

[0005] Another object of the present disclosure is to provide a battery module containing a battery.

[0006] Yet another object of the present disclosure is to provide a battery pack including a battery or a battery module.

[0007] It is yet another object of the present disclosure to provide a vehicle that includes a battery pack. [Means for solving the problem]

[0008] An embodiment of a first aspect of the present disclosure provides a battery. The battery includes a battery shell and an explosion-proof valve. The explosion-proof valve is disposed in the battery shell, and a notch groove is provided in the explosion-proof valve, and the explosion-proof valve includes an opening area. In a depth direction of the notch groove, an outer edge of the orthogonal projection of the opening area is a predetermined opening boundary, and an area of ​​the orthogonal projection of the opening area is S1, and S1 is expressed in mm 2 where the capacity of the battery is A, the unit of A is Ah, and S1 and A satisfy S1>0.5A.

[0009] According to the battery provided in the embodiment of the present disclosure, by controlling the ratio of the area S1 of the opening region to the capacity A of the battery, the pressure release speed of the battery is improved so that the internal pressure of the battery can be released timely and quickly, thereby improving the protection for the battery and the safety of the battery.

[0010] According to some examples of the present disclosure, when the positive electrode material of the battery is a compound with an olivine structure, S1 and A satisfy S1>0.5A, or when the positive electrode material of the battery includes a layered compound, S1 and A satisfy S1>1.2A.

[0011] According to some examples of the present disclosure, S1 is 80 mm 2 ≦S1≦1600mm 2 Meet the following.

[0012] According to some examples of the present disclosure, A satisfies 30Ah≦A≦400Ah.

[0013] According to some examples of the present disclosure, the notch groove includes two first arc segments arranged opposite to each other, a first straight line segment, and two second straight line segments spaced apart from each other, the first straight line segment and the second straight line segment are arranged parallel to each other, two ends of the first straight line segment are respectively connected to the two first arc segments, and each of the second straight line segments is connected to a corresponding first arc segment, and in the depth direction of the notch groove, two free ends of an outer edge of the orthogonal projection of the notch groove are connected to form a connecting line, and the connecting line and the outer edge of the orthogonal projection of the notch groove together form a predetermined opening boundary.

[0014] According to some examples of the present disclosure, a first reinforcing groove is formed in the opening region, the first reinforcing groove includes two fourth arc segments, the two fourth arc segments are symmetrically arranged along the width direction of the explosion-proof valve, the vertices of the two fourth arc segments coincide with each other, two ends of one of the fourth arc segments extend to the second straight line segment, and two ends of the other of the fourth arc segments extend to the first straight line segment.

[0015] According to some examples of the present disclosure, in a depth direction of the notch groove, the depth of the first reinforcing groove is smaller than the depth of the notch groove.

[0016] According to some examples of the present disclosure, the notch groove includes two second arc segments arranged opposite to each other and two third straight line segments arranged parallel to each other, two ends of each of the third straight line segments are respectively connected to the two second arc segments, the two third straight line segments and the two second arc segments form a closed annular structure, and in the depth direction of the notch groove, an outer edge of the orthogonal projection of the notch groove forms a predetermined opening boundary.

[0017] According to some examples of the present disclosure, a second reinforcing groove is formed in the opening region, the second reinforcing groove includes two eighth straight line segments and one ninth straight line segment, one end of each of the two eighth straight line segments is connected to the ninth straight line segment, an angle is formed between the two eighth straight line segments, the other ends of the two eighth straight line segments extend to two third straight line segments, respectively, and the other end of the ninth straight line segment is connected to the second arc segment.

[0018] According to some examples of the present disclosure, the notch groove includes a fourth straight line segment and four fifth straight line segments, two ends of the fourth straight line segment are respectively connected to two fifth straight line segments arranged at a preset angle, an arc-shaped segment is defined in the depth direction of the notch groove between the free ends of the orthogonal projections of the two fifth straight line segments arranged at the same end of the fourth straight line segment, the arc-shaped segment uses the vertex of the preset angle as the center of a circle, a sixth straight line segment is defined between the free ends of the orthogonal projections of the two fifth straight line segments arranged on the same side of the fourth straight line segment, and the two arc-shaped segments and the two sixth straight line segments together form a predetermined opening boundary.

[0019] According to some examples of the present disclosure, the explosion-proof valve includes a connection segment, a support segment, and a buffer segment, the connection segment is connected to an outer circumferential side of the support segment, the support segment and the connection segment are spaced apart from each other along a thickness direction of the support segment, the buffer segment is connected between the connection segment and the support segment, and an opening area is provided in the support segment.

[0020] According to some examples of the present disclosure, a groove is formed in the explosion-proof valve, and a notch groove is formed in the bottom wall of the groove.

[0021] According to some examples of the present disclosure, in the depth direction of the notch groove, an outer edge of the orthogonal projection of the groove and an outer edge of the orthogonal projection of the notch groove have an overlapping region.

[0022] According to some examples of the present disclosure, the explosion-proof valve is oval or athletics track shaped.

[0023] According to some examples of the present disclosure, the explosion-proof valve is of flat plate construction.

[0024] According to some examples of the present disclosure, the volume of the battery is V, where V is in mm 3 and V is 40000mm 3 ≦V≦3500000mm 3 Meet the following.

[0025] According to some examples of the present disclosure, the volume of the battery is V, where V is in mm 3 and S1 and V are 0.3 mm -1 Satisfy ≦5000×S1 / V.

[0026] According to some examples of the present disclosure, the volume of the battery is V, where V is in mm 3 and S1 and V are 5000×S1 / V≦6mm -1 Meet the following.

[0027] According to some examples of the present disclosure, the volume of the battery is V, where V is in mm 3 If the battery positive electrode material is a compound with an olivine structure, S1 and V are 0.3 mm -1 ≦5000×S1 / V≦5mm -1 Meet the following.

[0028] According to some examples of the present disclosure, the volume of the battery is V, where V is in mm 3 If the battery positive electrode material contains a layered compound, S1 and V are 0.5 mm -1 ≦5000×S1 / V≦6mm -1 Meet the following.

[0029] According to some examples of the present disclosure, the area of ​​the orthogonal projection of the explosion-proof valve in the depth direction of the notch groove is S, and the unit of S is mm 2 and S is 178.5mm 2 ≦S≦5212.5mm2 Meet the following.

[0030] According to some examples of the present disclosure, the area of ​​the orthogonal projection of the explosion-proof valve in the depth direction of the notch groove is S, and the unit of S is mm 2 and S and S1 further satisfy 0.3≦S1 / S≦0.95.

[0031] An embodiment of a second aspect of the present disclosure provides a battery module including a battery according to an embodiment of the first aspect.

[0032] An embodiment of a third aspect of the present disclosure provides a battery pack including a battery according to an embodiment of the first aspect or a battery module according to an embodiment of the second aspect.

[0033] An embodiment of a fourth aspect of the present disclosure provides a vehicle including a battery according to an embodiment of the first aspect or a battery pack according to an embodiment of the third aspect.

[0034] Additional aspects and advantages of the disclosure will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure.

[0035] The foregoing and / or additional aspects and advantages of the present disclosure will become apparent and understandable in the following description of embodiments, which proceeds with reference to the accompanying drawings. [Brief description of the drawings]

[0036] [Figure 1] FIG. 1 is a schematic diagram of a battery according to an embodiment of the present disclosure. [Diagram 2] 1 is a schematic cross-sectional view of an explosion-proof valve according to an embodiment of the present disclosure. [Diagram 3] 1 is a schematic diagram of an explosion-proof valve according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a schematic diagram of an explosion-proof valve according to another embodiment of the present disclosure. [Diagram 5]FIG. 13 is a schematic diagram of an explosion-proof valve according to yet another embodiment of the present disclosure. [Figure 6] FIG. 13 is a schematic diagram of an explosion-proof valve according to yet another embodiment of the present disclosure. [Figure 7] FIG. 2 is a schematic comparison diagram of pressure release speeds of batteries of Comparative Example 1 and Examples 1 to 3 according to the present disclosure. [Figure 8] FIG. 1 is a schematic comparison diagram of pressure release speeds of batteries of Comparative Example 2 and Examples 4 to 6 according to the present disclosure. [Figure 9] FIG. 1 is a schematic comparison diagram of pressure release speeds of batteries of Comparative Example 3 and Examples 7 to 9 according to the present disclosure. [Figure 10] FIG. 1 is a schematic comparison diagram of pressure release speeds of batteries of Comparative Example 4 and Examples 10 to 12 according to the present disclosure. [Figure 11] FIG. 1 is a schematic comparison diagram of pressure release speeds of the batteries of Comparative Example 5 and Examples 13 to 15 according to the present disclosure. [Figure 12] FIG. 1 is a schematic comparison diagram of pressure release speeds of batteries of Comparative Example 5 and Examples 16 to 18 according to the present disclosure. [Figure 13] FIG. 2 is a schematic comparison diagram of pressure release speeds of the batteries of Comparative Example 6 and Examples 19 to 21 according to the present disclosure. [Figure 14] FIG. 2 is a schematic comparison diagram of pressure release speeds of the batteries of Comparative Example 6 and Examples 22 to 24 according to the present disclosure. [Figure 15] FIG. 2 is a schematic comparison diagram of pressure release speed of the batteries of Comparative Example 7 and Example 25 according to the present disclosure. [Figure 16] FIG. 2 is a schematic comparison diagram of pressure release speed of the batteries of Comparative Example 8 and Example 26 according to the present disclosure. [Figure 17] FIG. 2 is a schematic comparison diagram of pressure release speed of the batteries of Comparative Example 9 and Example 27 according to the present disclosure. [Figure 18] FIG. 2 is a schematic comparison diagram of pressure release speed of the batteries of Comparative Example 10 and Example 28 according to the present disclosure. [Figure 19] FIG. 2 is a schematic comparison diagram of pressure release speed of the batteries of Comparative Example 11 and Example 29 according to the present disclosure. [Figure 20]FIG. 2 is a schematic comparison diagram of pressure release speed of the batteries of Comparative Example 12 and Example 30 according to the present disclosure. [Figure 21] 1 is a schematic diagram of a flat plate structure explosion-proof valve according to an embodiment of the present disclosure. [Figure 22] 1 is a schematic cross-sectional view of a flat-plate structure explosion-proof valve according to an embodiment of the present disclosure; FIG. [Figure 23] 1 is a schematic diagram of a vehicle according to an embodiment of the present disclosure. [Figure 24] FIG. 2 is a schematic diagram of a vehicle according to another embodiment of the present disclosure. [Diagram 25] FIG. 2 is a schematic diagram of a vehicle according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] DETAILED DESCRIPTION OF THE DRAWINGS The embodiments of the present disclosure are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary. In the following, a battery 100 according to an embodiment of the first aspect of the present disclosure will be described with reference to Figs. 2 to 22.

[0038] As shown in FIGS. 1 to 22, a battery 100 according to an embodiment of the first aspect of the present disclosure includes a battery shell 10 and an explosion-proof valve 20.

[0039] In detail, the explosion-proof valve 20 is disposed in the battery shell 10. The explosion-proof valve 20 is provided with a notch groove 25. The explosion-proof valve 20 includes an opening region 24. In the depth direction of the notch groove 25 (i.e., the direction from the groove top to the groove bottom of the notch groove 25), the outer edge of the orthogonal projection of the opening region 24 is a predetermined opening boundary, and the orthogonal projection area of ​​the opening region 24 is S1, where S1 is expressed in mm 2and the capacity of the battery 100 is A, and the unit of A is Ah. S1 and A satisfy S1>0.5A. In the above formula, the unit of the area S1 of the opening area 24 is square millimeters, and the unit of the capacity A of the battery 100 is ampere-hours. If the internal pressure of the battery 100 is excessively large, the gas in the battery 100 can be smoothly released from the opening area 24 of the explosion-proof valve 20, so that the use safety of the battery 100 can be guaranteed.

[0040] According to the battery 100 provided in the embodiment of the present disclosure, by controlling the ratio of the area S1 of the opening area 24 to the capacity A of the battery 100, the pressure release speed of the battery 100 is improved so that the internal pressure of the battery 100 can be released timely and quickly, thereby improving the protection for the battery 100 and the safety of the battery 100.

[0041] When the positive electrode material of the battery 100 is a compound with an olivine structure, S1 and A satisfy S1>0.5A. In this way, by selecting a compound with an olivine structure as the positive electrode material of the battery 100, a high capacity battery 100 can be obtained, and as a result, the battery 100 can have excellent electrochemical performance. The compound with an olivine structure may be selected from, but is not limited to, lithium iron phosphate, lithium manganese iron phosphate, or a mixture of lithium iron phosphate and lithium manganese iron phosphate.

[0042] When the positive electrode material of the battery 100 includes a layered compound, S1 and A satisfy S1>1.2A. Due to the high activity of the layered compound, by selecting the layered compound as the positive electrode material of the battery 100, the proportion of active material inside the battery 100 is increased, so that the energy of the battery 100 is increased and the capacity of the battery 100 is increased. Therefore, the battery 100 has a higher requirement for the pressure release speed of the explosion-proof valve 20. By setting S1 and A to satisfy S1>1.2A, the area of ​​the opening region 24 of the explosion-proof valve 20 is increased, which is more conducive to discharging the gas in the battery 100 as quickly as possible, thereby more effectively improving the safety of the battery 100. The positive electrode material of battery 100 may be selected from, but is not limited to, lithium nickel cobalt manganese oxygen ternary layered material, lithium iron phosphate and lithium nickel cobalt manganese oxygen ternary layered material, or lithium iron manganese and lithium nickel cobalt manganese oxygen ternary layered material.

[0043] In the following, an explanation is provided by using Comparative Examples 1-4 (i.e., related art) and Examples 1-12 (i.e., embodiments of the present disclosure). The battery 100 in Comparative Examples 1-4 and the battery 100 in Examples 1-12 are tested separately by using the method specified in GB / T 31485-2015, and the corresponding pressure release rate curves of the battery 100 are recorded. The battery in the related art is basically the same as the battery 100 in the embodiment, and the difference between the batteries only exists in the values ​​of the area S1 of the orthogonal projection of the opening region 24 and the battery capacity A.

[0044] When the positive electrode material of the battery 100 is lithium iron phosphate, the area S1 of the orthogonal projection of the opening region 24 of the battery and the battery capacity A in Comparative Examples 1 and 2, and the area S1 of the orthogonal projection of the opening region 24 of the battery 100 and the battery capacity A in Examples 1 to 12 are selected from Table 1 below. The pressure release rate test results of Comparative Example 1, Comparative Example 2, and Examples 1 to 6 are shown in Figures 7 and 8.

[0045] [Table 1]

[0046] With reference to Table 1, Fig. 7, and Fig. 8, it can be learned that Fig. 7 is a curve diagram of the air pressure change inside the battery 100 in Examples 1 to 3 and Comparative Example 1 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 8 is a curve graph of the air pressure change inside the battery 100 in Examples 4 to 6 and Comparative Example 2 when the internal pressure of the battery 100 increases and the pressure is released. It can be understood from the curve diagram that the change value of the air pressure reduction of the battery 100 in Examples 1 to 6 per unit time is larger than the change value of the air pressure reduction of the battery 100 in Comparative Example 1 and Comparative Example 2.

[0047] When the positive electrode material of the battery 100 is a lithium nickel cobalt manganese oxygen ternary layered material, the area S1 of the orthogonal projection of the opening region 24 of the battery in Comparative Examples 3 and 4 and the battery capacity A of the battery 100 in Examples 7 to 12 are selected from Table 2 below. The pressure release rate test results of Comparative Example 3, Comparative Example 4, and Examples 7 to 12 are shown in Figures 9 and 10.

[0048] [Table 2]

[0049] With reference to Table 2, Fig. 9, and Fig. 10, it can be learned that Fig. 9 is a curve graph of the air pressure change inside the battery 100 in Examples 7 to 9 and Comparative Example 3 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 10 is a curve graph of the air pressure change inside the battery 100 in Examples 10 to 12 and Comparative Example 4 when the internal pressure of the battery 100 increases and the pressure is released. From the curve graph, it can be understood that the change value of the air pressure reduction of the battery 100 in Examples 7 to 12 per unit time is larger than the change value of the air pressure reduction of the battery 100 in Comparative Example 3 and Comparative Example 4.

[0050] Therefore, referring to Examples 1 to 12, the range of values ​​of S1 / a protected in the embodiments of the present disclosure can effectively increase the orthogonal projection area S1 of the opening region 24, and can increase the amount of gas discharged from the explosion-proof valve 20 per unit time, thereby improving the safety of the battery 100 using the explosion-proof valve 20 of the present disclosure.

[0051] In some embodiments, S1 is 80 mm 2 ≦S1≦1600mm 2 The area of ​​the orthogonal projection of the opening region 24 is 80 mm 2 If the area of ​​the orthogonal projection of the opening region 24 is less than 1600 mm 2 , the area of ​​the opening region 24 is small and the requirement of discharging the gas in the battery 100 as quickly as possible may not be met. 2 If it is larger, the area of ​​the opening region 24 will be large and the structural strength of the explosion-proof valve 20 may be reduced.

[0052] In some embodiments, A satisfies 30Ah≦A≦400Ah. If the capacity of the battery 100 is less than 30Ah, the capacity of the battery 100 is low and the electrochemical performance may be insufficient. If the capacity of the battery 100 is higher than 400Ah, the capacity of the battery 100 is high, the requirements for the electrode material of the battery 100 are excessively high, and the safety performance of the battery 100 may be reduced.

[0053] Therefore, 80mm 2 ≦S1≦1600mm 2 By setting S1 and A to satisfy 30Ah≦A≦400Ah respectively, the area of ​​the opening area 24 is appropriate, so that the structural strength of the explosion-proof valve 20 is guaranteed while the pressure release speed of the explosion-proof valve 20 is improved. In addition, the battery 100 has an appropriate capacity that can meet the excellent charge and discharge performance of the battery 100, and can also ensure that the gas can be discharged in a timely manner after the internal pressure of the battery 100 increases, thereby ensuring that the battery 100 can be used safely.

[0054] According to some embodiments of the present disclosure, the notch groove 25 may be configured as a C-shaped notch groove or a double Y-shaped notch groove. The pattern of the notch groove 25 is not limited to the aforementioned shapes, and the notch groove may be any shape of the notch groove 25. The notch groove 25 may be designed according to requirements to meet various usage occasions.

[0055] According to some specific embodiments of the present disclosure, referring to Fig. 3 and Fig. 4, the notch groove 25 is a C-shaped notch groove. The notch groove 25 includes two first arc segments 251 arranged opposite to each other, a first straight segment 252, and two second straight segments 253 spaced apart from each other. The first straight segment 252 and the second straight segment 253 are arranged parallel to each other. Two ends of the first straight segment 252 are respectively connected to the two first arc segments 251. Each of the second straight segments 253 is connected to a corresponding first arc segment 251. In other words, the two ends of the first straight line segment 252 are each connected to one end of the two first circular arc segments 251, and the other ends of the two first circular arc segments 251 are each connected to one second straight line segment 253, and the two second straight line segments 253 are spaced apart from each other.

[0056] 3 and 4, in the depth direction of the notch groove 25, two free ends of the outer edge of the orthogonal projection of the notch groove 25 are connected to form a connecting line 263. That is, the connecting line between the side edges of the two second straight line segments 253 away from the center of the explosion-proof valve is the connecting line 263. The connecting line 263 and the outer edge of the orthogonal projection of the notch groove 25 together form a predetermined opening boundary. In this case, the area of ​​the region defined within the predetermined opening boundary (i.e., the area of ​​the orthogonal projection of the opening region 24 in the depth direction of the notch groove 25) is S c And S c = a1 × b1 + π × b1 2 / 4, and the total length of the notch groove 25 is L c And L c =2a1-c1+πb1, where a1 represents the length of the first straight line segment 252, b1 represents the distance between the outside of the first straight line segment 252 and the outside of the second straight line segment 253, and c1 represents the distance between the two second straight line segments 253, i.e., the length of the connecting line 263.

[0057] Furthermore, the cross section of the notch groove 25 may be rectangular or inverted trapezoid. The "cross section" in this specification is a plane parallel to the depth direction of the notch groove 25. When the cross section of the notch groove 25 is an inverted trapezoid, the width of the notch groove 25 gradually decreases in a direction toward the groove bottom of the notch groove 25. In this case, a1 may be understood as the length of the outer edge of the first straight line segment 252 at the groove top or opening, and b1 may be understood as the diameter of the outer edge of the first arc segment 251 at the groove top or opening. In other words, in the depth direction of the notch groove 25 (i.e., in the direction from the groove opening to the groove bottom of the notch groove 25), the outer edge of the orthogonal projection of the notch groove 25 includes two opposing semicircles, b1 may be understood as the diameter of each of the semicircles, and a1 may be understood as the distance between the centers of the two semicircles.

[0058] In some embodiments, as shown in FIG. 4 and FIG. 23, the notch groove 25 is a C-shaped notch groove. A first reinforcing groove 29 for structural reinforcement is further provided in the opening region 24, and the first reinforcing groove 29 is X-shaped. The first reinforcing groove 29 includes two fourth arc segments 260. The two fourth arc segments 260 are symmetrically arranged in the width direction of the explosion-proof valve 20 (e.g., the vertical direction in FIG. 4), and the vertices of the two fourth arc segments 260 coincide with each other. Two ends of one of the fourth arc segments 260 extend to be in contact with the second straight line segment 253, and two ends of the other of the fourth arc segments 260 extend to be in contact with the first straight line segment 252. In the depth direction of the notch groove 25, the depth of the first reinforcing groove 29 is smaller than the depth of the notch groove 25. In this case, the area of ​​the region defined within the predetermined opening boundary (i.e., the area of ​​the orthogonal projection of the opening region 24 in the depth direction of the notch groove 25) is S x And S x =S c =a2×b2+π×b2 2 / 4, and the total length of the notch groove 25 is L x And L x =L c =2a2-c2+πb2, where a2 represents the length of the first straight line segment 252, b2 represents the distance between the outside of the first straight line segment 252 and the outside of the second straight line segment 253, and c2 represents the distance between the two second straight line segments 253.

[0059] Furthermore, the cross section of the notch groove 25 may be rectangular or inverted trapezoid. The "cross section" in this specification is a plane parallel to the depth direction of the notch groove 25. When the cross section of the notch groove 25 is an inverted trapezoid, the width of the notch groove 25 gradually decreases in a direction toward the groove bottom of the notch groove 25. In this case, a2 may be understood as the length of the outer edge of the first straight line segment 252 at the groove top or opening, and b2 may be understood as the diameter of the outer edge of the first arc segment 251 at the groove top or opening. In other words, in the depth direction of the notch groove 25 (i.e., in the direction from the groove opening to the groove bottom of the notch groove 25), the outer edge of the orthogonal projection of the notch groove 25 includes two opposing semicircles, b2 may be understood as the diameter of each of the semicircles, and a2 may be understood as the distance between the centers of the two semicircles.

[0060] According to some specific embodiments of the present disclosure, as shown in FIG. 5 and FIG. 24, the notch groove 25 is an annular notch groove. A second reinforcing groove 290 for structural reinforcement is further provided in the opening region 24, and the second reinforcing groove 290 is Y-shaped. The Y-shaped second reinforcing groove is disposed inside the annular notch groove and connected to the annular notch groove. For example, the annular notch groove includes two second arc segments 254 disposed opposite to each other, and two third straight segments 255 disposed parallel to each other. The two ends of each of the third straight segments 255 are respectively connected to the two second arc segments 254. The two third straight segments 255 and the two second arc segments 254 form a closed annular structure. In the depth direction of the notch groove 25, the outer edge of the orthogonal projection of the notch groove 25 forms a predetermined opening boundary. The predefined opening boundary may be bounded by the side edges of the two third straight line segments 255 and the two second arc segments 254 away from the center of the explosion-proof valve.

[0061] The second reinforcing groove 290 includes two eighth straight segments 261 and one ninth straight segment 262. One end of each of the two eighth straight segments 261 may be connected to the ninth straight segment 262, forming an angle α between the two eighth straight segments 261, and the other ends of the two eighth straight segments 261 may be connected to one third straight segment 255, respectively. The other end of the ninth straight segment 262 may be connected to the second arc segment 254. The thickness corresponding to the second reinforcing groove 290 on the opening region 24 may be smaller than the thickness corresponding to the annular notch groove on the opening region. That is, the depth of the second reinforcing groove 290 is smaller than the depth of the annular notch groove. In this way, when the internal pressure of the battery 100 increases, the opening area 24 protrudes outward under the influence of the internal pressure, and the second reinforcing groove 290 can resist the deformation of the opening area 24 due to deformation, thereby improving the structural strength and anti-deformation ability of the opening area 24, and effectively preventing the explosion-proof valve from being erroneously opened. In this case, the area of ​​the area defined within the predetermined opening boundary (i.e., the area of ​​the orthogonal projection of the opening area 24 in the depth direction of the notch groove 25) is S y And S y =a3×b3+π×b3 2 / 4, and the total length of the notch groove 25 is L y And L y = 2c3 + d3, where a3 is the length of the third straight segment 255, b3 is the distance between the outsides of the two third straight segments 255, c3 is the length of the eighth straight segment 261, and d3 is the length of the ninth straight segment 262.

[0062] Furthermore, the cross section of the notch groove 25 may be rectangular or inverted trapezoid. The "cross section" in this specification is a plane parallel to the depth direction of the notch groove 25. When the cross section of the notch groove 25 is an inverted trapezoid, the width of the notch groove 25 gradually decreases in a direction toward the groove bottom of the notch groove 25. In this case, a3 may be understood as the length of the outer edge of the third straight line segment 255 at the groove top or opening, and b3 may be understood as the diameter of the outer edge of the second arc segment 254 at the groove top or opening. In other words, in the depth direction of the notch groove 25 (i.e., in the direction from the groove opening to the groove bottom of the notch groove 25), the outer edge of the orthogonal projection of the notch groove 25 includes two opposing semicircles, b3 may be understood as the diameter of each of the semicircles, and a3 may be understood as the distance between the centers of the two semicircles.

[0063] In some embodiments, referring to FIG. 6, the notch groove 25 is a double Y-shaped notch groove. When the internal pressure of the battery 100 increases and needs to be released, the internal pressure may be released from the double Y-shaped notch groove, causing the opening area 24 to invert toward the support segment, thereby realizing pressure release. For example, the double Y-shaped notch groove includes a fourth straight segment 256 and four fifth straight segments 257. The two ends of the fourth straight segment 256 are respectively connected to the two fifth straight segments 257 arranged at a preset angle. In the depth direction of the notch groove 25, an arc-shaped segment 259 is defined between the free ends of the orthogonal projections of the two fifth straight segments 257 arranged at the same end of the fourth straight segment 256, and the arc-shaped segment 259 uses the vertex of the preset angle of the two fifth straight segments 257 as the center of a circle. A sixth straight line segment 258 is defined between the free ends of the orthogonal projections of the two fifth straight line segments 257 located on the same side of the fourth straight line segment 256. The two arc-shaped segments 259 and the two sixth straight line segments 258 together form a predefined opening boundary. It should be noted that the arc-shaped segment 259 and the sixth straight line segment 258 may approximately intersect at a point because the widths of the fourth straight line segment 256 and the fifth straight line segment 257 are relatively small and can be ignored. The arc-shaped segment 259 may be understood as being defined by the free ends of the orthogonal projections of the two fifth straight line segments 257 located on the same end of the fourth straight line segment 256 that are closer to each other. The sixth straight line segment 258 may be understood as being defined by the free ends of the orthogonal projections of the two fifth straight line segments 257 located on the same side of the fourth straight line segment 256 that are closer to each other.

[0064] Referring to FIG. 6, the area of ​​the region defined within a given aperture boundary (i.e., the area of ​​the orthogonal projection of the aperture region 24 in the depth direction of the notch groove 25) is S double y and

[0065]

number

[0066] Therefore, different shapes of the notch groove 25 can change the structural strength of the opening region 24. A suitable notch groove 25 may be selected based on different design criteria, so that the process difficulty of the explosion-proof valve 20 is reduced, the pressure release speed of the explosion-proof valve 20 is improved, and the safety performance of the battery 100 is improved.

[0067] Furthermore, the cross section of the notch groove 25 may be rectangular or inverted trapezoid. The "cross section" in this specification is a plane parallel to the depth direction of the notch groove 25. When the cross section of the notch groove 25 is an inverted trapezoid, the width of the notch groove 25 gradually decreases in a direction toward the groove bottom of the notch groove 25. In this case, a4 may be understood as the length of the outer edge of the fourth straight segment 256 at the groove top or opening, b4 is the distance between the free ends F of the two fifth straight segments 257 arranged on the same side of the fourth straight segment 256 at the groove top or opening, and c4 is the length of the outer edge of the fifth straight segment 257 at the groove top or opening.

[0068] According to some specific embodiments of the present disclosure, as shown in FIG. 2, the explosion-proof valve 20 includes a connection segment 21, a support segment 22, and a buffer segment 23. The explosion-proof valve 20 is connected to the battery shell 10 through the connection segment 21. The connection segment 21 is connected to the outer periphery side of the support segment 22, and the support segment 22 and the connection segment 21 are spaced apart from each other along the thickness direction of the support segment 22. The buffer segment 23 is connected between the connection segment 21 and the support segment 22, and an opening area 24 is provided in the support segment 22. In this way, the connection segment 21 can fixedly connect the explosion-proof valve 20 to the battery shell 10, and the support segment 22 can improve the structural strength of the opening area 24 to prevent the opening area 24 from being deformed by an external force. In addition, by disposing the buffer segment 23 between the connection segment 21 and the support segment 22, the buffer segment 23 can absorb the thermal stress when the opening area 24 is welded to the support segment 22, thereby improving the reliability and safety of the explosion-proof valve 20.

[0069] Optionally, the support segment 22 is disposed on a side of the connection segment 21 adjacent to the center of the battery shell 10, so that the entire explosion-proof valve 20 is retracted toward the inside of the battery 100. In this way, abnormal opening of the opening region 24 caused by the effect of an external force on the opening region 24 can be effectively prevented.

[0070] According to some specific embodiments of the present disclosure, as shown in Fig. 2, a groove 221 is formed in the support segment 22, and a notch groove 25 is formed on the bottom wall of the groove 221. Thus, the protection of the support segment 22 against the opening area 24 can be increased. In addition, the opening area 24 is thinned so that when the internal pressure of the explosion-proof valve 20 increases and needs to be released, the opening area 24 can be opened smoothly, thereby preventing the explosion-proof valve 20 from failing.

[0071] In addition, the thickness of the opening region 24 may vary in the depth direction of the notch groove 25. For example, the thickness of the center of the opening region 24 is smaller than the thickness of the edge to ensure the strength of the connection between the opening region 24 and the support segment 22 and to reduce the manufacturing cost of the opening region 24.

[0072] According to some specific embodiments of the present disclosure, in the depth direction of the notch groove 25, the outer edge of the orthogonal projection of the groove 221 and the outer edge of the orthogonal projection of the notch groove 25 have an overlapping area. That is, the notch groove 25 is provided at the edge of the bottom wall of the groove 221. In this way, it can be ensured that the area of ​​the opening region 24 is maximized, which helps to improve the pressure release performance of the explosion-proof valve 20.

[0073] According to some optional embodiments of the present disclosure, the shape of the explosion-proof valve 20 is elliptical or athletics track shaped. In this way, the explosion-proof valve can be better fitted to the battery shell 10 of the battery 100. For example, when the cover plate of the battery shell 10 is elliptical or athletics track shaped, the amount of gas discharged from the explosion-proof valve 20 per unit time is larger, and a better pressure release effect is achieved.

[0074] As shown in Fig. 21 and Fig. 22, according to some embodiments of the present disclosure, the explosion-proof valve 20 is of a flat plate structure. A groove 221 is formed on the flat plate structure, and a notch groove 25 is formed on the edge of the bottom wall of the groove 221. In this way, when the internal pressure of the battery 100 increases and needs to be released, the explosion-proof valve 20 of the flat plate structure can be easily deformed and the gas can be discharged along the opening area 24 surrounded by the notch groove 25, so that the explosion-proof valve 20 of the flat plate structure can better fit the battery shell 10 of the battery 100 and quickly release the pressure.

[0075] According to some other embodiments of the present disclosure, the volume of the battery 100 is V, where V is in mm 3The explosion-proof valve 20 is provided with a notch groove 25, and the explosion-proof valve 20 includes an opening region 24. In the depth direction of the notch groove 25, the outer edge of the orthogonal projection of the opening region 24 is the predetermined opening boundary. The area of ​​the orthogonal projection of the opening region 24 is S1, and S1 is expressed in mm 2 S1 and A are 5000×S1 / V≧0.3mm -1 In the above formula, the area S1 of the orthogonal projection of the opening area 24 is in square millimeters, and the volume V of the battery 100 is in cubic millimeters. If the internal pressure of the battery 100 is excessively large, the gas in the battery 100 can be smoothly released through the opening area 24 of the explosion-proof valve 20, so as to ensure the safe use of the battery 100.

[0076] According to some embodiments of the present disclosure, S1 and V are 5000×S1 / V≦6 mm -1 In this way, by controlling the ratio of the area S1 of the opening region 24 to the volume V of the battery 100 to be within a suitable range, the pressure release speed of the battery 100 can be effectively improved, so that the internal pressure of the battery 100 can be released timely and quickly, thereby improving the protection for the battery 100. In addition, the explosion-proof valve 20 has high structural strength, thereby ensuring the safe use of the battery 100.

[0077] According to some embodiments of the present disclosure, when the positive electrode material of the battery 100 is a compound with an olivine structure, S1 and V are 0.3 mm -1 ≦5000×S1 / V≦5mm -1 In this way, by selecting a compound having an olivine structure as the positive electrode material of the battery 100, the battery 100 has excellent electrochemical performance. For example, the battery 100 has a high capacity. -1 If the ratio of S1 to V is less than 5 mm, the area of ​​the opening region 24 is small and the requirement for timely exhaust of the gas in the battery 100 may not be met. -1If it is larger, the area of ​​the opening region 24 will be large, and the structural strength of the explosion-proof valve 20 may be reduced, affecting the safe use of the battery 100. -1 ≦5000×S1 / V≦5mm -1 By designing S1 and V to satisfy, the ratio of the area of ​​the opening region 24 to the volume of the battery 100 is appropriate, and it can be ensured that the internal pressure of the battery 100 can be released timely and quickly while the battery 100 has excellent electrochemical performance, thereby effectively improving the safety of the battery 100. The compound with an olivine structure may be optionally selected from, but is not limited to, lithium iron phosphate, lithium manganese iron phosphate, or a mixture of lithium iron phosphate and lithium manganese iron phosphate.

[0078] According to some other embodiments of the present disclosure, when the positive electrode material of the battery 100 comprises a layered compound, S1 and V are 0.5 mm -1 ≦5000×S1 / V≦6mm -1 Due to the high activity of the lithium nickel cobalt manganese oxygen ternary layered material, by selecting a high activity material such as lithium nickel cobalt manganese oxygen ternary layered material, a combination of lithium iron phosphate and lithium nickel cobalt manganese oxygen ternary layered material, or a combination of lithium iron manganese and lithium nickel cobalt manganese oxygen ternary layered material as the positive electrode material of the battery 100, the proportion of active material inside the battery 100 is increased, so that the battery 100 has a larger energy, and the battery 100 has a better electrochemical performance, for example, a higher capacity. Therefore, a higher requirement is proposed for the pressure release speed of the explosion-proof valve 20. When the ratio of S1 to V is 0.5 mm -1 If the ratio of S1 to V is less than 6 mm, the area of ​​the opening region 24 is small and the requirement of discharging the gas in the battery 100 as quickly as possible may not be met. -1 If it is larger than 0.5 mm, the area of ​​the opening region 24 is large and the safety performance of the battery 100 may be reduced. -1≦5000×S1 / V≦6mm -1 By designing S1 and V to satisfy, the ratio of the area of ​​the opening region 24 to the volume of the battery 100 is appropriate, and it can be ensured that the internal pressure of the battery 100 can be released timely and quickly while the battery 100 has excellent charge and discharge performance, thereby ensuring the safe use of the battery 100. Optionally, the layered compound is, but is not limited to, a lithium nickel cobalt manganese oxygen ternary layered material, a lithium iron phosphate and a lithium nickel cobalt manganese oxygen ternary layered material, or a lithium iron manganese and a lithium nickel cobalt manganese oxygen ternary layered material.

[0079] In the following, an explanation is provided by using Comparative Examples 5 and 6 (i.e., related art) and Examples 13-24 (i.e., embodiments of the present disclosure). The batteries 100 in Comparative Examples 5 and 6 and the batteries 100 in Examples 13-24 are tested separately by using the method specified in GB / T 31485-2015, and the corresponding pressure release rate curves of the batteries 100 are recorded. The battery 100 in the related art is basically the same as the battery 100 in the embodiment, and the difference between the batteries only exists in the values ​​of the area S1 of the orthogonal projection of the opening region 24 of the battery 100 and the volume V of the battery 100.

[0080] When the positive electrode material of the battery 100 is lithium iron phosphate, the area S1 of the orthogonal projection of the opening region 24 of the battery in Comparative Example 5 and the volume V of the battery 100 in Examples 13 to 18 are selected from Table 3 below. Figures 11 and 12 show the pressure release rate test results.

[0081] [Table 3]

[0082] With reference to Table 3, Fig. 11, and Fig. 12, it can be learned that Fig. 11 is a curve diagram of the air pressure change inside the battery 100 in Examples 13-15 and Comparative Example 5 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 12 is a curve graph of the air pressure change inside the battery 100 in Examples 16-18 and Comparative Example 5 when the internal pressure of the battery 100 increases and the pressure is released. It can be understood from the curve diagram that the change value of the air pressure reduction of the battery 100 in Examples 13-18 per unit time is larger than the change value of the air pressure reduction of the battery 100 in Comparative Example 5.

[0083] When the positive electrode material of the battery 100 is a layered compound, and the layered compound is a lithium nickel cobalt manganese oxygen ternary layered material, the area S1 of the orthogonal projection of the opening region 24 of the battery in Comparative Example 6 and the volume V of the battery 100 in Examples 19 to 24 are selected from Table 4 below. Figures 13 and 14 show the pressure release rate test results.

[0084] [Table 4]

[0085] With reference to Table 4, Fig. 13, and Fig. 14, it can be learned that Fig. 11 is a curve diagram of the air pressure change inside the battery 100 in Examples 19-21 and Comparative Example 6 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 12 is a curve graph of the air pressure change inside the battery 100 in Examples 22-24 and Comparative Example 6 when the internal pressure of the battery 100 increases and the pressure is released. From the curve diagram, it can be understood that the change value of the air pressure reduction of the battery 100 in Examples 19-24 per unit time is larger than the change value of the air pressure reduction of the battery 100 in Comparative Example 6.

[0086] Therefore, referring to Examples 13 to 24, the range of values ​​of 5000×S1 / V protected in the embodiments of the present disclosure can effectively increase the orthogonal projection area S1 of the opening region 24, and can increase the amount of gas discharged from the explosion-proof valve 20 per unit time, thereby improving the safety of the battery 100 using the explosion-proof valve 20 of the present disclosure.

[0087] In some embodiments, S1 is 80 mm 2 ≦S1≦1600mm 2 The area of ​​the orthogonal projection of the opening region 24 is 80 mm 2 If the area of ​​the orthogonal projection of the opening region 24 is less than 1600 mm 2 , the area of ​​the opening region 24 is small and the requirement of discharging the gas in the battery 100 as quickly as possible may not be met. 2 If it is larger, the area of ​​the opening region 24 will be large and the structural strength of the explosion-proof valve 20 may be reduced.

[0088] In some embodiments, V is 40000 mm 3 ≦V≦3500000mm 3 The volume of the battery 100 is 40000 mm 3 If the volume of the battery 100 is less than 3.5 million mm, the volume of the battery 100 is small and the electrochemical performance of the battery 100 may be insufficient. 3 If it is larger, the volume of the battery 100 will be large, and the structural strength of the explosion-proof valve 20 may be reduced, leading to a reduction in the safety performance of the battery 100.

[0089] Therefore, 80mm 2 ≦S1≦1600mm 2 and 40000mm 3 ≦V≦3500000mm 3By setting S1 and V to respectively satisfy, the area of ​​the opening region 24 becomes appropriate, so that the structural strength of the explosion-proof valve 20 is guaranteed while the pressure release speed of the explosion-proof valve 20 is improved. In addition, the battery 100 has an appropriate volume that can meet the excellent charge and discharge performance of the battery 100, and can also ensure that the gas can be discharged in a timely manner after the internal pressure of the battery 100 increases, thereby ensuring that the battery 100 can be used safely.

[0090] According to some other embodiments of the present disclosure, in the depth direction of the notch groove, the area of ​​the orthogonal projection of the opening region 24 is related to the area of ​​the orthogonal projection of the explosion-proof valve 20. The area of ​​the orthogonal projection of the explosion-proof valve 20 is S, and the area of ​​the orthogonal projection of the opening region is S1, where S1 and S satisfy S1 / S≧0.3.

[0091] For example, S1 / S=0.5. The area defined within the predetermined opening boundary may be the area reserved for pressure release during the design of the explosion-proof valve 20. When the internal pressure of the battery 100 increases and needs to be released, the internal pressure of the battery 100 may be released from the opening area 24. By limiting the ratio of S1 to S, it can be ensured that the open area of ​​the opening area 24 is appropriate, which facilitates the pressure release of the battery 100, thereby ensuring the pressure release performance of the explosion-proof valve 20 and improving the use safety of the battery 100.

[0092] It should be noted that when the explosion-proof valve 20 is welded and fixed to the battery 100, for example the battery shell 10, a weld seam is formed between the explosion-proof valve 20 and the battery shell 10. Alternatively, when the explosion-proof valve 20 is welded and fixed to the cover plate of the battery, a weld seam may be formed between the explosion-proof valve 20 and the cover plate. Half of the width of the weld seam is the outer edge of the explosion-proof valve 20. The width of the weld seam refers to the gap between the outer contour and the inner contour of the orthogonal projection of the weld seam in the depth direction of the notch groove 25.

[0093] According to the battery 100 in the embodiment of the present disclosure, by controlling the shape of the explosion-proof valve 20, the explosion-proof valve 20 can be applied to the battery shell 10 of the battery 100 having various different shapes, widening the application range of the explosion-proof valve 20. In addition, by controlling the area ratio of the orthogonal projection area S1 of the opening area 24 to the orthogonal projection area S of the explosion-proof valve 20, the area ratio of the opening area 24 in the explosion-proof valve 20 can be increased, thereby ensuring the opening area of ​​the explosion-proof valve 20 and improving the operation efficiency of the explosion-proof valve 20, thereby allowing the internal pressure of the battery 100 to be released in a timely manner, increasing the protection of the battery 100, and reducing the cost of using the battery 100.

[0094] According to some embodiments of the present disclosure, S1 and S are such that S1 / S≦0.95, 80 mm 2 ≦S1≦1600mm 2 , and 178.5mm 2 ≦S≦5212.5mm 2 For example, S1 = 1000 mm 2 and S=3000mm 2 If the total area S of the explosion-proof valve 20 is fixed, S1 < 80 mm 2 The situation where the opening area 24 cannot be opened normally when S1>1600 mm can be effectively prevented. 2 , the opening area 24 will occupy an excessively large proportion of the area S of the explosion-proof valve 20. As a result, the structural stability of the explosion-proof valve 20 will be reduced, and the opening area 24 will be easily opened by mistake, affecting the service life of the explosion-proof valve 20. Therefore, by restricting the range of values ​​of S1 and S so that S1 / S falls within a suitable range, the structural strength of the opening area 24 will be increased while ensuring that the area S1 of the orthogonal projection of the opening area 24 can meet the pressure release requirements, thereby ensuring the stability of the connection between the opening area 24 and the explosion-proof valve 20.

[0095] In some embodiments, the notch groove 25 may be configured as a C-shaped notch groove, an annular notch groove, or a double Y-shaped notch groove. The pattern of the notch groove 25 is not limited to the aforementioned shapes, and the notch groove may be any shape of the notch groove 25. The notch groove 25 may be designed according to requirements to meet various usage occasions. When the notch groove 25 is a C-shaped notch groove, an annular notch groove, or a double Y-shaped notch groove, the corresponding area of ​​the notch groove is as described above, and the details thereof will not be described again in this specification.

[0096] In the following, an explanation is provided by using Comparative Examples 7 and 12 (i.e., related art) and Examples 25-30 (i.e., embodiments of the present disclosure). The batteries 100 in Comparative Examples 7 and 12 and the batteries 100 in Examples 25-30 are separately tested by using the method specified in GB / T 31485-2015, and the corresponding pressure release rate curves of the batteries 100 are recorded. The battery 100 in the related art is basically the same as the battery 100 in the embodiment, and the difference between the batteries only exists in the values ​​of the area S1 of the orthogonal projection of the opening area 24 and the area S of the orthogonal projection of the explosion-proof valve 20.

[0097] The orthogonal projection area S1 of the opening area 24 of the battery and the orthogonal projection area S of the explosion-proof valve 20 in Comparative Examples 7 to 12, and the orthogonal projection area S1 of the opening area 24 of the battery 100 and the orthogonal projection area S of the explosion-proof valve 20 in Examples 25 to 30 are selected from Table 5 below. Figures 15 to 20 show the pressure release speed test results.

[0098] [Table 5]

[0099] With reference to Table 5 and Figs. 15 to 20, it can be learned that Fig. 15 is a curve diagram of the air pressure change inside the battery 100 in Example 25 and Comparative Example 7 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 16 is a curve graph of the air pressure change inside the battery 100 in Example 26 and Comparative Example 8 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 17 is a curve graph of the air pressure change inside the battery 100 in Example 27 and Comparative Example 9 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 18 is a curve graph of the air pressure change inside the battery 100 in Example 28 and Comparative Example 10 when the internal pressure of the battery 100 increases and the pressure is released. Fig. 19 is a curve graph of the air pressure change inside the battery 100 in Example 29 and Comparative Example 11 when the internal pressure of the battery 100 increases and the pressure is released. 20 is a curve graph of the change in air pressure inside battery 100 in Example 30 and Comparative Example 12 when the internal pressure of battery 100 increases and the pressure is released. It can be understood from the curve graph that the change in air pressure reduction per unit time of battery 100 in Examples 25 to 30 is larger than the change in air pressure reduction of battery 100 in Comparative Examples 7 to 12.

[0100] Therefore, referring to Examples 25 to 30, the range of values ​​of S1 / S protected in the embodiments of the present disclosure can effectively increase the open area of ​​the opening region 24 and increase the amount of gas discharged from the explosion-proof valve 20 per unit time, thereby improving the safety of the battery 100 using the explosion-proof valve 20 of the present disclosure.

[0101] Optionally, the energy density of the battery 100 is ED. ED satisfies 200wh / kg≦ED≦280wh / kg. Thus, the larger energy of the battery 100 indicates more active materials or materials with higher activity inside the battery 100. Therefore, a more accurate design is needed for the amount of gas discharged by the explosion-proof valve 20 of the battery 100 to ensure timely opening in extreme cases and prevent the explosion-proof valve from opening erroneously.

[0102] An embodiment of the second aspect of the present disclosure provides a battery module 200. Referring to FIG. 23, the battery module includes a battery 100 according to the embodiment of the first aspect. The battery module 200 may include a plurality of batteries 100 arranged side by side. The plurality of batteries 100 may be connected in series or parallel. In the description of the present disclosure, "multiple" means two or more. Thus, the battery 100 is used in the battery module 200, which can improve the safety of the battery module 200. The battery module 200 may further include two end plates (not shown) and two side plates (not shown). The two end plates are distributed on two ends of the plurality of batteries 100 along a first direction, and the two side plates are distributed on two sides of the plurality of batteries 100 along a second direction. The end plates are fixedly connected to the side plates to fix the battery 100, and the first direction is perpendicular to the second direction. Indeed, in other embodiments, the battery module 200 may alternatively include two end plates and ties (not shown) that are distributed at two ends of the plurality of batteries 100 and secured by the ties.

[0103] The battery module 200 according to the embodiment of the present disclosure has good safety and long service life.

[0104] An embodiment of the third aspect of the present disclosure provides a battery pack 300. Referring to Fig. 23 and Fig. 24, the battery pack includes the battery 100 according to the embodiment of the first aspect, or the battery module 200 according to the embodiment of the second aspect. The battery pack 300 includes a tray. The battery 100 or the battery module 200 is fixed to the tray, and the tray is fixed to a vehicle 400. The battery 100 in the aforementioned embodiment may be placed directly on the tray, or the battery module 200 in the aforementioned embodiment is fixed to the tray.

[0105] According to the battery pack 300 in the embodiment of the present disclosure, by using the above-mentioned battery 100 or battery module 200, the stability of using the battery pack 300 can be improved.

[0106] An embodiment of the fourth aspect of the present disclosure provides a vehicle 400. With reference to FIG. 23 and FIG. 25, the vehicle includes the battery 100 according to the embodiment of the first aspect, or includes the battery pack 300 according to the embodiment of the third aspect. In this manner, the possibility of explosion of the vehicle 400 can be reduced, thereby improving the safety performance of the vehicle 400. For example, in some embodiments, the battery 100 may be directly attached to the vehicle 400. In some other embodiments, the battery 100 is assembled into the battery pack 300, and the battery pack 300 is attached to the vehicle 400.

[0107] In the description herein, the description of a reference term such as "embodiments," "some embodiments," "example embodiments," "examples," "particular examples," or "some examples" means that the particular feature, structure, material, or characteristic described with reference to the embodiment or example is included in at least one embodiment or example of the present disclosure. In the description herein, general descriptions of the aforementioned terms do not necessarily refer to the same embodiment or example.

[0108] Although embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and scope of the present disclosure, the scope of the present disclosure being as defined by the appended claims and their equivalents. [Explanation of symbols]

[0109] 100 Battery 10 Battery Shell 20 Explosion-proof valve 21 Connection Segments 22 Support Segments 23 Buffer Segment 221 Groove 24 Opening area 25 Notch Groove 251 First Arc Segment 252 First Line Segment 253 Second Line Segment 254 Second Arc Segment 255 third line segment 256 Fourth Line Segment 257 Fifth Line Segment 258 Sixth Line Segment 259 Circular Segment 260 Fourth Arc Segment 261 8th straight line segment 262 9th straight segment 263 Connecting Line 27 Seventh straight segment 28 Third Arc Segment 29 First Reinforcement Groove 290 Second Reinforcement Groove 200 Battery Module 300 Battery Pack 400 vehicles

Claims

1. A battery shell (10); A battery (100) comprising an explosion-proof valve (20), the explosion-proof valve (20) being disposed in the battery shell (10), a notch groove (25) being provided in the explosion-proof valve (20), the explosion-proof valve (20) comprising an opening region (24), an outer edge of an orthogonal projection of the opening region (24) in a depth direction of the notch groove (25) being a predetermined opening boundary, and an area of ​​the orthogonal projection of the opening region (24) being S １ And S １ The unit is mm ２ The capacity of the battery (100) is A, the unit of A is Ah, and S １ and A is S １ >0.5A, the battery (100).

2. When the positive electrode material of the battery (100) is a compound having an olivine structure, S １ and A is S １ > 0.5A, or When the positive electrode material of the battery 100 includes a layered compound, S １ and A is S １ The battery (100) of claim 1, wherein the battery meets a current of >1.2A.

3. S １ is 80 mm ２ ≦S １ ≦1600mm ２ The battery (100) of claim 1 or 2,

4. The battery (100) of any one of claims 1 to 3, wherein A satisfies 30 Ah≦A≦400 Ah.

5. the notch groove (25) comprises two first arc segments (251) arranged opposite to each other, a first straight segment (252), and two second straight segments (253) spaced apart from each other, the first straight segment (252) and the second straight segment (253) are arranged parallel to each other, two ends of the first straight segment (252) are connected to the two first arc segments (251), respectively, and each of the second straight segments (253) is connected to the corresponding first arc segment (251); 5. The battery (100) according to claim 1, wherein in the depth direction of the notch groove (25), two free ends of an outer edge of the orthogonal projection of the notch groove (25) are connected to form a connection line (263), and the connection line (263) and the outer edge of the orthogonal projection of the notch groove (25) together form the predetermined opening boundary.

6. 6. The battery (100) according to claim 5, wherein a first reinforcing groove (29) is formed in the opening region (24), the first reinforcing groove (29) comprises two fourth arc segments (260), the two fourth arc segments (260) are arranged symmetrically along a width direction of the explosion-proof valve (20), vertices of the two fourth arc segments (260) coincide with each other, two ends of one of the fourth arc segments (260) extend to the second straight segment (253), and two ends of the other of the fourth arc segments (260) extend to the first straight segment (252).

7. The battery (100) according to claim 6, wherein in the depth direction of the notch groove (25), the depth of the first reinforcing groove (29) is smaller than the depth of the notch groove (25).

8. the notch groove (25) comprises two second arc segments (254) arranged opposite to each other and two third straight line segments (255) arranged parallel to each other, two ends of each of the third straight line segments (255) are respectively connected to the two second arc segments (254), and the two third straight line segments (255) and the two second arc segments (254) form a closed annular structure; The battery (100) according to any one of claims 1 to 4, wherein in the depth direction of the notch groove (25), an outer edge of an orthogonal projection of the notch groove (25) forms the predetermined opening boundary.

9. 9. The battery (100) of claim 8, wherein a second reinforcing groove (290) is formed in the opening region (24), the second reinforcing groove (290) comprising two eighth straight line segments (261) and one ninth straight line segment (262), one end of each of the two eighth straight line segments (261) being connected to the ninth straight line segment (262), an angle being formed between the two eighth straight line segments (261), the other ends of the two eighth straight line segments (261) extending to the two third straight line segments (255), respectively, and the other end of the ninth straight line segment (262) being connected to the second arc segment (254).

10. the notch groove (25) comprises a fourth straight line segment (256) and four fifth straight line segments (257), two ends of the fourth straight line segment (256) are respectively connected to two fifth straight line segments (257) arranged at a preset angle; 5. The battery according to claim 1, wherein, in the depth direction of the notch groove, an arc-shaped segment is defined between free ends of orthogonal projections of two fifth straight line segments arranged on the same end of the fourth straight line segment, the arc-shaped segment uses a vertex of the preset angle as a center of a circle, and a sixth straight line segment is defined between free ends of orthogonal projections of two fifth straight line segments arranged on the same side of the fourth straight line segment, the two arc-shaped segments and the two sixth straight line segments forming the predetermined opening boundary together.

11. 11. The battery (100) according to claim 1, wherein the explosion-proof valve (20) comprises a connection segment (21), a support segment (22), and a buffer segment (23), the connection segment (21) is connected to an outer circumferential side of the support segment (22), the support segment (22) and the connection segment (21) are spaced apart from each other along a thickness direction of the support segment (22), the buffer segment (23) is connected between the connection segment (21) and the support segment (22), and the opening area (24) is provided in the support segment (22).

12. The battery (100) according to any one of claims 1 to 11, wherein the explosion-proof valve (20) is formed with a groove (221), and the notch groove (25) is formed in a bottom wall of the groove (221).

13. 13. The battery (100) of claim 12, wherein in the depth direction of the notch groove (25), an outer edge of the orthogonal projection of the groove (221) and the outer edge of the orthogonal projection of the notch groove (25) have an overlapping region.

14. 14. The battery (100) of any one of claims 1 to 13, wherein the anti-explosion valve (20) is oval or athletics track shaped.

15. The battery (100) according to any one of claims 1 to 14, wherein the explosion-proof valve (20) is of flat plate construction.

16. The volume of the battery (100) is V, and the unit of V is mm ３ and V is 40000 mm ３ ≦V≦3500000 mm ３ The battery (100) of any one of claims 1 to 15,

17. The volume of the battery (100) is V, and the unit of V is mm ３ And S １ and V is 0.3 mm －１ ≦5000×S １ 17. The battery (100) of claim 1, wherein the battery satisfies:

18. The volume of the battery (100) is V, and the unit of V is mm ３ And S １ and V is 5000 x S １ / V≦6mm －１ The battery (100) of any one of claims 1 to 17,

19. The volume of the battery (100) is V, and the unit of V is mm ３ and when the positive electrode material of the battery (100) is the compound with the olivine structure, S １ and V is 0.3 mm －１ ≦5000×S １ / V≦5mm －１ The battery (100) of any one of claims 1 to 18, wherein

20. The volume of the battery (100) is V, and the unit of V is mm ３ and when the positive electrode material of the battery (100) comprises the layered compound, S １ and V is 0.5 mm －１ ≦5000×S １ / V≦6mm －１ The battery (100) of any one of claims 1 to 18, wherein

21. In the depth direction of the notch groove (25), the area of ​​the orthogonal projection of the explosion-proof valve (20) is S, and the unit of S is mm ２ and S is 178.5 mm ２ ≦S≦5212.5mm ２ 21. The battery (100) of any one of claims 1 to 20, wherein

22. In the depth direction of the notch groove (25), the area of ​​the orthogonal projection of the explosion-proof valve (20) is S, and the unit of S is mm ２ and S and S １ 0.3≦S １ 22. The battery (100) of any one of claims 1 to 21, further satisfying / S≦0.

95.

23. A battery module (200) comprising the battery (100) according to any of claims 1 to 22.

24. A battery pack (300) comprising the battery (100) according to any one of claims 1 to 22 or the battery module (200) according to claim 23.

25. A vehicle (400) comprising the battery (100) of any one of claims 1 to 22 or the battery pack (300) of claim 24.

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