Battery, battery pack and electric equipment

Abstract

The utility model provides a battery, a battery pack and electric equipment, the battery comprises a plurality of plates and an electrode assembly, the plurality of plates are mutually connected to form an accommodating cavity, and the electrode assembly is arranged in the accommodating cavity; at least one plate is provided with a through hole and an assembling groove which are arranged in the second direction and communicated with each other; the explosion-proof sheet is connected with the plate, is arranged in the assembling groove and covers and seals the through hole; wherein the assembling groove has a first size D1 mm, the anti-explosion piece has a second size D2 mm, and the requirement that (D1-D2) / 2 is larger than or equal to 0.02 and smaller than or equal to 0.2 is met. The through hole, the assembly groove and the anti-explosion piece matched with the assembly groove are arranged in the battery to form the anti-explosion valve, and the size for mutual matching between the anti-explosion piece and the plate is further provided, so that the structural strength of the anti-explosion piece and the whole cover plate is reliably improved, the good matching of the anti-explosion valve and the whole cover plate is ensured, and the service life of the battery is prolonged. And the safe use performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery materials, and particularly relates to a battery, a battery pack and an electrical equipment. BACKGROUND

[0002] With the development of the application of lithium batteries in the automobile power industry, higher requirements are put forward for the strength and safety performance of the battery. In the existing cell structure, a safety explosion-proof valve is often used. When the air pressure in the cell reaches a preset value, the explosion-proof valve will open to discharge the high-pressure gas in the cell, thereby avoiding safety problems such as battery thermal runaway.

[0003] However, welding the explosion-proof valve on the cover plate may cause the strength of the local area of the cover plate to be weakened, thereby affecting the burst value of the entire battery explosion-proof valve, and making it difficult to guarantee the safety of the battery. Therefore, how to improve the structure of the explosion-proof valve and the cooperation relationship between the explosion-proof valve and the cover plate to improve the overall strength and safety performance of the battery is a problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to solve the problem of battery safety caused by improper cooperation between the explosion-proof valve and the cover plate, and improve the overall strength of the battery. Another object of the application is to provide a battery pack. A third object of the application is to provide an electrical equipment.

[0005] Technical scheme: on the one hand, the application provides a battery, which comprises a plurality of plate members and an electrode assembly, the plurality of plate members are connected to each other to form a containing cavity, and the electrode assembly is arranged in the containing cavity.

[0006] At least one of the plate members has through holes and assembly grooves arranged along the second direction and connected to each other.

[0007] The battery further comprises an explosion-proof sheet, the explosion-proof sheet is arranged in the assembly groove and covers the through holes, and the explosion-proof sheet is connected to the plate member.

[0008] Wherein, along the first direction, the assembly groove has a first size D1 mm, the explosion-proof sheet has a second size D2 mm, and the following condition is met: 0.02≤(D1-D2) / 2≤0.2.

[0009] In some embodiments, the first size D1 mm satisfies: 5≤D1≤70; or the second size D2 mm satisfies: 5≤D2≤70.

[0010] In some embodiments, the plate member has two first surfaces oppositely arranged along the first direction, and the two first surfaces are used to surround and form the assembly groove.

[0011] The plate member further comprises two side surfaces facing away from the first direction, and the two first surfaces are located between the two side surfaces.

[0012] Wherein, along the first direction, the side surface and the first surface have a minimum size L1 mm, satisfying: 2≤L1≤25.

[0013] In some embodiments, the rupture disc comprises a body and a flange connected to the periphery of the body, the flange extends away from the second direction, and is connected to the plate member.

[0014] Wherein, along the second direction, the assembly groove has a third size D3 mm, and the flange has a fourth size D4 mm, satisfying: 0.02≤D3-D4≤0.2.

[0015] In some embodiments, the third size D3 mm satisfies: 0.3≤D3≤2; or, the fourth size D4 mm satisfies: 0.3≤D4≤2.

[0016] In some embodiments, the rupture disc has a notch near one side of the through hole, along the first direction, the notch and the flange have a first spacing L2 mm, satisfying: 0.3≤L2≤3.

[0017] In some embodiments, along the first direction, the through hole has a fifth size D5 mm, satisfying: 0.25≤(D1-D5) / 2≤2.5.

[0018] In some embodiments, along the first direction, the flange has a sixth size D6 mm, the second size D2 mm, the fifth size D5 mm, the sixth size D6 mm, and the first spacing L2 mm further satisfy: 0.5≤D5-[D2-(D6+L2)*2]≤5.

[0019] In another aspect, the present application further provides a battery pack comprising the battery provided in any of the above embodiments.

[0020] The embodiments of the present application further provide a use electric device comprising the battery pack.

[0021] Beneficial effects: the battery provided by the embodiment of the application comprises a plurality of plate members and an electrode assembly, the plurality of plate members are connected to each other to form a containing cavity, and the electrode assembly is arranged in the containing cavity; at least one plate member has through holes and assembly grooves arranged in a second direction and connected to each other; the battery further comprises an explosion-proof sheet connected to the plate member, arranged in the assembly groove, and covering and sealing the through holes; wherein the assembly groove has a first size D1 mm, the explosion-proof sheet has a second size D2 mm, and the following condition is met: 0.02≤(D1-D2) / 2≤0.2. By arranging the through holes and the assembly grooves in the battery plate member, and arranging the explosion-proof sheet matched with the assembly groove to form an explosion-proof valve, and further providing the size matched between the explosion-proof sheet and the plate member, the structural strength of the explosion-proof sheet and the battery shell as a whole is reliably improved, the explosion-proof valve and the battery as a whole are ensured to be well matched, and the safe use performance of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The technical solutions and other beneficial effects of the application will be apparent through the following detailed description of the specific embodiments of the application in combination with the accompanying drawings.

[0023] Figure 1 A structure diagram of a plate member in a battery is provided for the embodiment of the application.

[0024] Figure 2 A partial structure diagram of a plate member in a battery is provided for the embodiment of the application.

[0025] Figure 3 A cross-sectional structure diagram of a plate member in a battery is provided for the embodiment of the application.

[0026] Figure 4 A structure diagram of a plate member in a battery is provided for another embodiment of the application.

[0027] Figure 5 A partial structure diagram of a plate member in a battery is provided for another embodiment of the application.

[0028] Figure 6 A cross-sectional structure diagram of a plate member in a battery is provided for another embodiment of the application.

[0029] Figure 7 A cross-sectional structure diagram of a plate member in a battery is provided for the embodiment of the application.

[0030] Figure 8 A partial enlarged structure diagram of a plate member in a battery is provided for the embodiment of the application.

[0031] Figure 9 A cross-sectional structure diagram of an explosion-proof sheet in a battery is provided for the embodiment of the application.

[0032] Figure 10A partial enlarged structure diagram of an explosion-proof sheet in a battery is provided in an embodiment of the present application.

[0033] Figure 11 A diagram of a shell rupture of a battery after a safety test is provided in a comparative example of the present application.

[0034] Explanation of reference signs:

[0035] 100 - plate, 101 - first face, 102 - side face, 110 - through hole, 120 - assembly groove, 200 - explosion-proof sheet, 210 - body, 220 - flange, 230 - score. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely in the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features.

[0038] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0039] The first embodiment of the present application provides a battery, referring to Figures 1-3 , comprising a plurality of plates 100 and an electrode assembly, the plurality of plates 100 are connected to each other to form a receiving cavity, and the electrode assembly is arranged in the receiving cavity;

[0040] At least one plate member 100 has through holes 110 and assembly grooves 120 arranged along the second direction Y and connected to each other. It can be understood that the plurality of plate members 100 connected to each other can be an integrally formed battery housing, or can be a split housing and cover plate; the through holes 100 and the assembly grooves 120 can be arranged on the battery housing or on the battery cover plate.

[0041] The battery further comprises an explosion-proof sheet 200 arranged in the assembly groove 120 and covering the through hole 110, and the explosion-proof sheet 200 is connected to the plate member 100.

[0042] Referring to Figure 2 and Figure 3 In some embodiments, the assembly groove 120 is located on the side of the through hole 110 close to the battery cell.

[0043] Referring to Figures 4-6 In still other embodiments, the assembly groove 120 is located on the side of the through hole 110 away from the battery cell.

[0044] Referring to Figure 7 and Figure 9 Along the first direction X, the assembly groove 120 has a first size D1 mm, and the explosion-proof sheet 200 has a second size D2 mm, satisfying: 0.02≤(D1-D2) / 2≤0.2. It can be understood that the value of (D1-D2) / 2 can be any value or a range between any two values of 0.02, 0.05, 0.1, 0.15, and 0.2.

[0045] The material of the plate member 100 can be an aluminum sheet, which is connected to the explosion-proof sheet 200 by welding and forms a gap fit. The explosion-proof sheet 200 and the plate member 100 fit closely, and the gap is too small to assemble, or the gap is too large to cause problems such as welding defects. When the relationship between the first size D1 mm of the assembly groove 120 and the second size D2 mm of the explosion-proof sheet 200 satisfies the above value range, the overall strength of the explosion-proof sheet 200 and the plate member 100 after welding can be ensured.

[0046] Referring to Figure 7 and Figure 9 In some embodiments, the first size D1 mm satisfies: 5≤D1≤70; or the second size D2 mm satisfies: 5≤D2≤70. It can be understood that the value of D1 or D2 can be any value or a range between any two values of 5, 10, 20, 30, 40, 50, 60, and 70. When the first size D1 mm or the second size D2 mm satisfies the above value range, the demand scenarios of the opening area of the explosion-proof valve of the battery cell of more specifications can be met.

[0047] Referring to Figure 7 and Figure 8In some embodiments, the plate member 100 has two first surfaces 101 oppositely arranged along the first direction X, and the two first surfaces 101 are used to form the assembly groove 120;

[0048] The plate member 100 further includes two side surfaces 102 oppositely arranged along the first direction X, and the two first surfaces 101 are located between the two side surfaces 102;

[0049] Wherein, along the first direction X, the side surface 102 and the first surface 101 have a minimum size L1 mm, which satisfies: 2≤L1≤25.

[0050] It can be understood that the value of L1 can be any value or a range between any two values in 2, 5, 10, 15, 20, and 25. When the minimum size L1 mm between the side surface 102 and the first surface 101 satisfies the above value range, the overall strength of the plate member 100 can be ensured, and the deformation or even rupture failure of the explosion-proof valve caused by the local high temperature generated during the welding of the battery shell and the battery can be avoided.

[0051] Referring to Figure 9 and Figure 10 In some embodiments, the explosion-proof sheet 200 includes a body 210 and a flange 220 connected to the outer periphery of the body 210, the flange 220 extends away from the second direction Y, and is connected with the plate member 100;

[0052] Wherein, along the second direction Y, the assembly groove 120 has a third size D3 mm, and the flange 220 has a fourth size D4 mm, which satisfies: 0.02≤D3-D4≤0.2.

[0053] It can be understood that the value of D3-D4 can be any value or a range between any two values in 0.02, 0.05, 0.1, 0.15, and 0.2. When the value of D3-D4 satisfies the above value range, the problem of too large height difference can be avoided when the explosion-proof sheet 200 is assembled into the assembly groove 120, and the problems of explosion hole or uneven weld seam during the welding of the explosion-proof sheet 200 and the plate member 100 can be avoided.

[0054] Referring to Figure 8 and Figure 10 In some embodiments, the third size D3 mm satisfies: 0.3≤D3≤2. It can be understood that the value of D3 can be any value or a range between any two values in 0.3, 0.5, 1, 1.5, and 2. When the value of D3 satisfies the above value range, the welding strength of the explosion-proof sheet 200 and the plate member 100 can be ensured, and the sufficient height accommodation welding depth can be ensured to ensure the stable connection of the formed explosion-proof valve and the cover 100.

[0055] Referring to Figure 10In some embodiments, the fourth dimension D4 mm satisfies: 0.3≤D4≤2. It can be understood that the value of D4 can be any value in 0.3, 0.5, 1, 1.5, 2 or a range between any two values. When the value of D4 satisfies the above value range, the welding strength of the rupture disc 200 and the plate 100 can be further ensured.

[0056] Referring to Figure 9 and Figure 10 In some embodiments, the rupture disc 200 has a notch 230 on the side close to the through hole 110. Along the first direction X, the notch 230 and the flange 220 have a first spacing L2 mm, which satisfies: 0.3≤L2≤3. It can be understood that the value of L2 can be any value in 0.3, 1, 1.5, 2, 2.5, 3 or a range between any two values. When the first spacing L2 mm satisfies the above value range, the notch 230 of the rupture disc 200 is less likely to be deformed and fail due to the heat of welding, and the effective use area of the rupture disc is also less likely to be reduced.

[0057] Referring to Figure 7 In some embodiments, along the first direction X, the through hole 110 has a fifth dimension D5 mm, which satisfies: 0.25≤(D1-D5) / 2≤5. It can be understood that the value of D1-D5 can be any value in 0.5, 1, 2, 3, 4, 5 or a range between any two values. When the value of D1-D5 satisfies the above value range, the stability of the connection between the rupture disc 200 and the plate 100 can be ensured.

[0058] Referring to Figure 10 In some embodiments, along the first direction X, the flange 220 has a sixth dimension D6 mm, which satisfies: 0.5≤D6≤3. It can be understood that the value of D6 can be any value in 0.5, 1, 1.5, 2, 2.5, 3 or a range between any two values.

[0059] On the basis of the above embodiments, further, a second spacing L3 mm is provided, L3=D5-[D2-(D6+L2)*2], and the second spacing L3 mm satisfies: 0.5≤L3≤5. It can be understood that the value of L3 can be any value in 0.5, 1, 2, 3, 4, 5 or a range between any two values. When the value of L3 respectively satisfies the above value range, the notch 230 on the rupture disc 200 can be ensured to be located on the inner side of the through hole 110, so that when thermal runaway occurs, the rupture disc 200 can normally open and complete pressure relief.

[0060] The second embodiment of the present application provides a battery pack, which includes the battery provided in any of the above embodiments.

[0061] The third embodiment of the present application provides a battery pack for an electric device.

[0062] The battery provided by the present application is described as follows in combination with specific embodiments.

[0063] Embodiment 1

[0064] The present embodiment provides a battery, as shown in Figures 1-3 and Figures 7-10 The battery comprises:

[0065] a plate member 100, the plate member 100 having through holes 110 and assembly grooves 120 arranged along a second direction Y and communicating with each other;

[0066] an explosion-proof sheet 200, the explosion-proof sheet 200 being arranged in the assembly grooves 120 and covering the through holes 110, and the explosion-proof sheet 200 being connected with the plate member 100;

[0067] wherein, along the first direction X, the assembly groove 120 has a first size of 8.5 mm, and the explosion-proof sheet 200 has a second size of 8.4 mm.

[0068] The plate member 100 has two first surfaces 101 oppositely arranged along the first direction X, and the two first surfaces 101 are used to surround and form the assembly grooves 120;

[0069] The plate member 100 further comprises two side surfaces 102 oppositely arranged along the first direction X, and the two first surfaces 101 are located between the two side surfaces 102;

[0070] wherein, along the first direction X, the side surface 102 and the first surface 101 have a minimum size of 3.4 mm.

[0071] The explosion-proof sheet 200 comprises a body 210 and a flange 220 connected to the outer periphery of the body 210, the flange 220 extending away from the second direction Y and being connected with the plate member 100;

[0072] wherein, along the second direction Y, the assembly groove 120 has a third size of 0.55 mm, and the flange 220 has a fourth size of 0.5 mm.

[0073] The side of the explosion-proof sheet 200 close to the through hole 110 has a notch 230, along the first direction X, the notch 230 and the flange 220 have a first spacing of 0.4 mm, the through hole 110 has a fifth size of 6.5 mm, and the flange 220 has a sixth size of 0.7 mm.

[0074] Embodiments 2-8

[0075] The structure of the battery provided by embodiments 2-8 is consistent with that of embodiment 1, and only the structural parameters are adjusted.

[0076] Comparative examples 1-8

[0077] The structure of the batteries provided in Comparative Examples 1-8 is consistent with that of Example 1, with only adjustments in the structural parameters.

[0078] The structural parameters of Examples 1-8 and Comparative Examples 1-8 are shown in Table 1.

[0079] Table 1

[0080]

[0081]

[0082] The batteries formed by the batteries provided in Examples 1-8 and Comparative Examples 1-8 were subjected to helium leak testing and safety testing, and the test results are shown in Table 2.

[0083] The helium leak testing method is as follows: helium leak testing refers to a method of using a helium mass spectrometer to test the airtightness of the explosion-proof valve of a battery. The test requirement is that, at the explosion-proof valve of the battery, the internal-to-external and external-to-internal 0.15 MPa states are each tested for 30 seconds, and the leak rate is <10 -7 pa.m 3 / s after 10 cycles of breathing testing, and the burst pressure is within the tolerance range, then the explosion-proof valve meets the sealing requirements.

[0084] Table 2

[0085]

[0086]

[0087] Referring to Figure 11 The batteries provided in Comparative Example 1, Comparative Example 2, Comparative Example 4, Comparative Example 7, and Comparative Example 8 all had shell ruptures during the safety testing, which caused the batteries to be unable to continue to be used.

[0088] From the test results in Table 2, it can be seen that:

[0089] Comparing Comparative Example 1 with Comparative Example 1, the only difference is the value of (D1-D2) / 2 for the two cover plates, where the value in Comparative Example 1 is too small, and the other values are the same. It was found that the explosion-proof valve of Example 1 was welded normally, the helium leak rate of the cover plate was qualified, the explosion-proof valve opened normally during the test, and the shell did not have any rupture failure. The thermal runaway test passed. In contrast, the explosion-proof valve and cover plate of Comparative Example 1 were difficult to assemble due to the small gap, which caused the valve plate to deform, the helium leak test failed, the explosion-proof valve delayed in opening during the test, the shell had already ruptured and failed, the valve plate had not yet opened, and therefore could not play a safety protection role during the use of the battery.

[0090] Comparative Example 2 and Comparative Example 2, two covers only (D3-D4) / 2 value is different, wherein the value is too small, Comparative Example 2, other values are the same. Example 2 explosion-proof valve welding normal, cover helium leak rate qualified, and the test process explosion-proof valve normal opening, shell also did not occur any rupture failure, thermal runaway test passed. And Comparative Example 2 explosion-proof valve welding hole and uneven weld, helium leak rate is unqualified, explosion-proof valve in the test process opening time delay, shell has occurred rupture failure, valve piece still not open, unable to play the safety protection role in the use of the battery.

[0091] Comparative Example 3 and Comparative Example 3, two covers only (D1-D5) / 2 value is different, wherein the value is too small, Comparative Example 3, other values are the same. Example 3 explosion-proof valve welding normal, cover helium leak rate qualified, and the test process explosion-proof valve normal opening, shell also did not occur any rupture failure, thermal runaway test passed. And Comparative Example 3 cover welding although no obvious abnormal, and helium leak rate is qualified, but explosion-proof valve to, explosion-proof valve is not opened, there is a security risk in the use of the battery.

[0092] Comparative Example 4 and Comparative Example 4, two covers only L3 is different, other dimensions are the same, wherein the L3 of Comparative Example 4 exceeds the lower limit of 0.5-3. Example 4 explosion-proof valve welding normal, cover helium leak rate qualified, and the test process explosion-proof valve normal opening, shell also did not occur any rupture failure, thermal runaway test passed. And Comparative Example 4 cover welding although no obvious abnormal, and helium leak rate is qualified, but the distance between the explosion-proof valve notch and the explosion-proof valve hole is too small, even the notch is inside the explosion-proof valve hole, blocking the valve piece from opening normally, resulting in the explosion-proof valve failure in the test process, shell has occurred rupture failure, valve piece still not open, unable to play the safety protection role in the use of the battery.

[0093] Comparative Example 5 and Comparative Example 5, two covers only L3 is different, other dimensions are the same, wherein the L3 of Comparative Example 5 exceeds the lower limit of 0.5-3. Example 5 explosion-proof valve welding normal, cover helium leak rate qualified, and the test process explosion-proof valve normal opening, shell also did not occur any rupture failure, thermal runaway test passed. And Comparative Example 5 cover welding although no obvious abnormal, and helium leak rate is qualified, but the distance between the explosion-proof valve notch and the explosion-proof valve hole is too large, resulting in the notch of the valve piece to reduce the explosion-proof pressure of the valve piece, causing the valve piece to open prematurely, there is a security risk in the use of the battery.

[0094] Comparative Example 6 and Comparative Example 6, two covers only (D1-D5) / 2 value is different, wherein the value of Comparative Example 6 is too large, and the other values are the same. The explosion-proof valve of Example 6 is welded normally, the helium leak rate of the cover is qualified, and the explosion-proof valve opens normally during the test process, and the shell does not have any rupture failure, and the thermal runaway test passes. While the cover welding of Comparative Example 6 has no obvious abnormality, and the helium test is qualified, but the distance from the notch to the welding position of the explosion-proof valve is too large, which reduces the notch blasting area of the valve plate, reduces the blasting pressure of the valve plate, causes the valve plate to open too early, and there is a safety hazard during the use of the battery.

[0095] Comparative Example 7 and Comparative Example 7, two covers only (D3-D4) / 2 value is different, wherein the value of Comparative Example 7 is too large, and the other values are the same. The explosion-proof valve of Example 7 is welded normally, the helium leak rate of the cover is qualified, and the explosion-proof valve opens normally during the test process, and the shell does not have any rupture failure, and the thermal runaway test passes. While the explosion-proof valve of Comparative Example 7 is welded with a blast hole and the penetration is too small, the helium leak rate is unqualified, the explosion-proof valve is delayed in opening during the test process, the shell has been ruptured and failed, and the valve plate has not been opened, which cannot play a safety protection role during the use of the battery.

[0096] Comparative Example 8 and Comparative Example 8, two covers only (D1-D2) / 2 value is different, wherein the value of Comparative Example 8 is too large, and the other values are the same. It is found that the explosion-proof valve of Example 8 is welded normally, the helium leak rate of the cover is qualified, and the explosion-proof valve opens normally during the test process, and the shell does not have any rupture failure, and the thermal runaway test passes. While the gap between the cover and the explosion-proof valve of Example 8 is too large, the welding appears virtual welding and blast hole, the helium leak rate is unqualified, the explosion-proof valve is delayed in opening during the test process, the shell has been ruptured and failed, and the valve plate has not been opened, which cannot play a safety protection role during the use of the battery.

[0097] The above describes in detail a battery, a battery pack and a power equipment provided by the embodiments of the present application. The principles and implementation manners of the present application are described by applying specific examples. The above example is only used to help understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized by, The battery comprises a plurality of plate members (100) and an electrode assembly, the plate members (100) are connected to each other to form a receiving cavity, and the electrode assembly is arranged in the receiving cavity; At least one of the plate members (100) has through holes (110) and assembly grooves (120) arranged in a second direction (Y) and connected to each other; The battery further comprises an explosion-proof sheet (200) arranged in the assembly groove (120) and covering the through holes (110), and the explosion-proof sheet (200) is connected to the plate member (100); In the first direction (X), the assembly groove (120) has a first size D1 mm, and the explosion-proof sheet (200) has a second size D2 mm, and the following condition is met: 0.02≤(D1-D2) / 2≤0.

2.

2. The battery of claim 1, wherein The first size D1 mm meets: 5≤D1≤70; or the second size D2 mm meets: 5≤D2≤70.

3. The battery of claim 1, wherein The plate member (100) has two first surfaces (101) arranged opposite to each other in the first direction (X), and the two first surfaces (101) are used to surround to form the assembly groove (120); The plate member (100) further comprises two side surfaces (102) facing away from each other in the first direction (X), and the two first surfaces (101) are located between the two side surfaces (102); In the first direction (X), the side surface (102) and the first surface (101) have a minimum size L1 mm, and the following condition is met: 2≤L1≤25.

4. The battery of claim 1, wherein The explosion-proof sheet (200) comprises a body (210) and a flange (220) connected to the periphery of the body (210), the flange (220) extends away from the second direction (Y) and is connected to the plate member (100); In the second direction (Y), the assembly groove (120) has a third size D3 mm, and the flange (220) has a fourth size D4 mm, and the following condition is met: 0.02≤D3-D4≤0.

2.

5. A battery according to claim 4, wherein The third size D3 mm meets: 0.3≤D3≤2; or the fourth size D4 mm meets: 0.3≤D4≤2.

6. The battery of claim 4, wherein The side of the explosion-proof sheet (200) close to the through hole (110) has a notch (230), and in the first direction (X), the notch (230) and the flange (220) have a first spacing L2 mm, and the following condition is met: 0.3≤L2≤3.

7. A battery according to claim 6, wherein In the first direction (X), the through hole (110) has a fifth size D5 mm, and the following condition is met: 0.25≤(D1-D5) / 2≤2.

5.

8. A battery according to claim 7, wherein In the first direction (X), the flange (220) has a sixth size D6 mm, and the second size D2 mm, the fifth size D5 mm, the sixth size D6 mm and the first spacing L2 mm meet the following condition: 0.5≤D5-[D2-(D6+L2)*2]≤5.

9. A battery pack, characterized by, The battery comprises any one of claims 1-8.

10. An electric device, characterized by The battery pack comprises the battery of claim 9.

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