Mounting structure of explosion-proof valve protection sheet and battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a mounting structure of an anti-explosion valve protection sheet and a battery, the mounting structure of the anti-explosion valve protection sheet comprises a mounting plate, the anti-explosion valve protection sheet and an anti-explosion valve, an annular boss is arranged in the circumferential direction of a first mounting hole in the mounting plate, and the anti-explosion valve protection sheet is connected to the side, away from the mounting plate, of the annular boss; a notch is formed in the side, away from the first liquid injection hole, of the annular boss and communicates with the first mounting hole. The anti-explosion valve is connected to one side, close to the pole group, of the mounting plate. The mounting position of the anti-explosion valve protection sheet is raised through the annular boss, electrolyte is prevented from permeating into the first mounting hole from a gap between the anti-explosion valve protection sheet and the annular boss, and the anti-explosion valve is protected. Meanwhile, due to the arrangement of the notch, the helium detection accuracy of the explosion-proof valve is ensured. The invention also provides a battery, wherein one side wall of a cover plate or a shell of the battery is assembled with the anti-explosion valve protection sheet by adopting the mounting structure of the anti-explosion valve protection sheet.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a mounting structure of an explosion-proof valve protection sheet and a battery. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. The traditional lithium battery structure includes a cover plate, a shell and a pole group. The cover plate and the shell are welded and sealed to encapsulate the pole group inside. The cover plate is provided with an injection hole and an explosion-proof valve, and the electrolyte is injected into the shell through the injection hole. The explosion-proof valve is set on one side of the injection hole to relieve pressure in the event of thermal runaway. An explosion-proof valve protection sheet is provided above the explosion-proof valve to protect the explosion-proof valve from direct mechanical impact. A notch is provided on the explosion-proof valve protection sheet to ensure the accuracy of helium detection.

[0003] However, there is a phenomenon of electrolyte bubbling during the injection process, which causes a certain probability that the electrolyte will flow from the gap of the explosion-proof valve protection plate to the explosion-proof valve, which may cause the explosion-proof valve to corrode and fail in the air, and it is also difficult to clean the electrolyte on the explosion-proof valve. Summary of the invention

[0004] The purpose of the present invention is to provide an installation structure of an explosion-proof valve protection sheet and a battery, wherein the explosion-proof valve protection sheet can prevent the explosion-proof valve from being corroded by the electrolyte, plays a good protective role for the explosion-proof valve, and at the same time ensures that the mechanical strength of the installation structure around the explosion-proof valve is high.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a mounting structure for an explosion-proof valve protection sheet, comprising:

[0007] A mounting plate is arranged on one side of the electrode group, a first mounting hole and a first injection hole are arranged on the mounting plate, an annular boss is arranged in the circumference of the first mounting hole, the annular boss extends along a first direction, an end surface of the annular boss away from the electrode group is higher than an end surface of the mounting plate away from the electrode group, the first injection hole is arranged on one side of the annular boss along a second direction, a notch is arranged on a side of the annular boss away from the first injection hole, and the notch is communicated with the first mounting hole;

[0008] An explosion-proof valve protection sheet connected to a side of the annular boss away from the pole group;

[0009] An explosion-proof valve is connected to a side of the mounting plate close to the pole group. When the explosion-proof valve is opened, a pressure relief channel is formed. The pressure relief channel is communicated with the first mounting hole.

[0010] Optionally, a pole is integrated on the mounting plate, and along the first direction, the end face of the pole away from the pole group protrudes from the end face of the mounting plate away from the pole group by a height of h1, and the end face of the annular boss away from the pole group protrudes from the end face of the mounting plate away from the pole group by a height of h2; wherein the value of h2 satisfies: 0.2mm≤h2≤2h1 / 3;

[0011] The value range of h1 is: 1mm≤h1≤5mm.

[0012] Optionally, a dimension of the notch along the second direction is a, and a has a value range of 0.1 mm ≤ a ≤ 2 mm.

[0013] Optionally, the width of the annular boss is t, and the value range of t is: 0.5mm≤t≤2mm;

[0014] And / or, the distance between the inner peripheral wall of the annular boss on the side close to the first mounting hole and the outer peripheral wall of the explosion-proof valve protection plate is g1, and the value range of g1 is: 0.5t≤g1≤t+2mm.

[0015] Optionally, a sinker is provided on the end surface of the mounting plate close to the pole group, the sinker includes a side wall and a bottom wall, the explosion-proof valve includes a fixing portion, the end surface of the fixing portion away from the pole group along the first direction abuts against the bottom wall, and the circumferential side wall of the fixing portion is welded to the side wall.

[0016] Optionally, the explosion-proof valve also includes a main body, the fixing part is arranged around the circumference of the main body, and a notched groove is provided on the main body; along the second direction, the distance between the side of the notched groove close to the fixing part and the side wall of the platform is f, and the value range of f is: 2mm≤f≤5mm.

[0017] Optionally, a distance between an inner circumferential wall of the annular boss on a side close to the first mounting hole and a side of the notched groove close to the fixing portion is e, and a value range of e is: 0.5 mm ≤ e ≤ 3 mm.

[0018] Optionally, along the third direction, a distance between a side edge of the explosion-proof valve protection sheet and an adjacent side edge of the mounting plate is b, and a value range of b is: b≥2 mm.

[0019] Optionally, along the first direction, the explosion-proof valve protection sheet has a thickness of δ;

[0020] The value range of δ is: 0.1mm≤δ≤1mm.

[0021] On the other hand, the present invention provides a battery, comprising a cover plate, a shell, a pole group and an explosion-proof valve protection sheet, wherein the cover plate is connected to the shell and encloses a receiving cavity, the pole group is arranged in the receiving cavity, the cover plate is the mounting plate, and the cover plate and the explosion-proof valve protection sheet are assembled using the mounting structure of the explosion-proof valve protection sheet in any of the above schemes;

[0022] Alternatively, one of the side walls of the shell is the mounting plate, and one of the side walls of the shell and the explosion-proof valve protection sheet are assembled using the mounting structure of the explosion-proof valve protection sheet in any of the above solutions.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a mounting structure of an explosion-proof valve protection sheet, comprising a mounting plate, an explosion-proof valve protection sheet and an explosion-proof valve. The mounting plate is provided with a first mounting hole and a first injection hole. The first mounting hole is provided with an annular boss extending along a first direction in the circumference thereof. The end surface of the annular boss away from the pole group is higher than the end surface of the cover plate away from the pole group. The first injection hole is arranged on one side of the annular boss along a second direction. A notch is arranged on the side of the annular boss away from the first injection hole, and the notch is connected to the first mounting hole. The explosion-proof valve protection sheet is connected to the side of the annular boss away from the pole group. The explosion-proof valve is connected to the side of the mounting plate close to the pole group. By setting the annular boss, the mounting position of the explosion-proof valve protection sheet is raised, thereby preventing the overflowing electrolyte from infiltrating into the first mounting hole from the gap between the explosion-proof valve protection sheet and the annular boss when injecting liquid through the first injection hole, and playing a good protective role for the explosion-proof valve. In addition, by setting the annular boss, the structural strength around the mounting position of the explosion-proof valve is improved, which is conducive to protecting the explosion-proof valve from being easily deformed by pressure and the valve opening pressure is accurate. At the same time, the setting of the notch on the annular boss can ensure that the explosion-proof valve is inspected with high accuracy during helium inspection without missing any items.

[0025] The present invention also provides a battery, including a cover plate, a shell, a pole group and an explosion-proof valve protection sheet, wherein the cover plate is connected to the shell and encloses a receiving cavity, the pole group is arranged in the receiving cavity, and one of the side walls of the cover plate or the shell and the explosion-proof valve protection sheet are assembled using the above-mentioned installation structure of the explosion-proof valve protection sheet. By adopting the above-mentioned installation structure of the explosion-proof valve protection sheet, the explosion-proof valve can be protected without affecting the air tightness detection of the explosion-proof valve, and no leakage will be made; and the structural strength around the installation position of the explosion-proof valve can be improved, and the heat dissipation capacity can be improved, and the adverse effects on the explosion-proof valve when the cover plate and the shell are welded around the periphery can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0027] Figure 1 Structural schematic diagram of the installation structure of the explosion-proof valve protection piece in Embodiment 1 of the present invention;

[0028] Figure 2 Exploded view of the installation structure of the explosion-proof valve protection piece in Embodiment 1 of the present invention;

[0029] Figure 3 For Figure 2 Partial enlarged view at A in

[0030] Figure 4 Top view of the installation structure of the explosion-proof valve protection piece in Embodiment 1 of the present invention;

[0031] Figure 5 For Figure 4 Cross-sectional view of the B-B section in

[0032] Figure 6 For Figure 5 Partial enlarged view at C in

[0033] Figure 7 For Figure 5 Partial enlarged view at D in

[0034] Figure 8 For Figure 5 Partial enlarged view at E in

[0035] In the figure:

[0036] 100, cover plate; 110, first mounting hole; 120, first liquid injection hole; 130, counterbore; 131, bottom wall of the counterbore; 132, side wall of the counterbore; 200, annular boss; 210, straight section; 211, notch; 220, arc section; 300, explosion-proof valve protection piece; 400, explosion-proof valve; 410, fixing part; 420, body part; 421, scoring groove; 500, terminal post; 510, first branch; 511, plate body; 512, first column; 513, second column; 5131, convex part; 520, second branch; 521, second mounting hole; 522, limiting step; 600, first plastic part; 700, second plastic part; 710, air hole; 720, second liquid injection hole; 800, seal. Detailed implementation manners

[0037] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and "above", "over" and "on" of the first feature with respect to the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. "Under", "below" and "beneath" of the first feature with respect to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0041] Embodiment 1

[0042] As Figures 1 - 3As shown, this embodiment provides a mounting structure of an explosion-proof valve protection sheet, and the mounting structure of the explosion-proof valve protection sheet includes a cover plate 100, an explosion-proof valve protection sheet 300, and an explosion-proof valve 400. In this embodiment, the cover plate 100 of the battery is used as an example for description as a mounting plate, and the cover plate 100 and the explosion-proof valve protection sheet 300 are assembled using the above-mentioned mounting structure of the explosion-proof valve protection sheet.

[0043] Specifically, the cover plate 100 is arranged on one side of the pole group, and a first mounting hole 110 and a first injection hole 120 are arranged on the cover plate 100. An annular boss 200 is arranged around the first mounting hole 110, and the annular boss 200 extends along a first direction. The end surface of the annular boss 200 away from the pole group is higher than the end surface of the cover plate 100 away from the pole group. The first injection hole 120 is arranged on one side of the annular boss 200 along a second direction. A notch 211 is arranged on the side of the annular boss 200 away from the first injection hole 120. The notch 211 is connected to the first mounting hole 110, and the first direction is perpendicular to the second direction. The first direction is Figure 1 The Z-axis direction shown in the figure, the second direction is Figure 1 The X-axis direction is shown in .

[0044] The explosion-proof valve protection sheet 300 is connected to the side of the annular boss 200 away from the pole group. For example, the explosion-proof valve protection sheet 300 can be bonded to the end face of the annular boss 200 away from the pole group by adhesive, thereby achieving the fixation of the explosion-proof valve protection sheet 300. The explosion-proof valve 400 is connected to the side of the cover plate 100 close to the pole group. For example, the explosion-proof valve 400 can be connected to the side of the cover plate 100 close to the pole group by welding, thereby achieving the fixation of the explosion-proof valve 400. Further, when the explosion-proof valve 400 opens, a pressure relief channel is formed, and the pressure relief channel is connected to the first mounting hole 110. Therefore, when the battery has thermal runaway, the explosion-proof valve 400 will open the valve, and the high-temperature and high-pressure gas inside the battery will enter the first mounting hole 110 through the pressure relief channel of the explosion-proof valve 400, and then the explosion-proof valve protection sheet 300 will be opened and released to the space on the side of the cover plate 100 away from the pole group to achieve pressure relief.

[0045] In addition, due to the setting of the annular boss 200, the installation position of the explosion-proof valve protection sheet 300 is raised, so that the end surface of the explosion-proof valve protection sheet 300 is higher than the end surface of the cover plate 100 away from the pole group, thereby preventing the overflowing electrolyte from infiltrating into the first installation hole 110 from the gap between the explosion-proof valve protection sheet 300 and the annular boss 200 when injecting liquid into the battery's accommodating cavity through the first injection hole 120, and then flowing to the explosion-proof valve 400, causing the explosion-proof valve 400 to be corroded, which plays a good protective role for the explosion-proof valve 400. At the same time, the setting of the notch 211 on the annular boss 200 makes the first installation hole 110 communicate with the space on the side of the cover plate 100 away from the pole group. When the welding quality of the explosion-proof valve 400 and the cover plate 100 is poor and the sealing does not meet the requirements, it can be detected by helium detection, ensuring that the accuracy of the helium detection of the explosion-proof valve 400 is high and the battery has good sealing. Furthermore, by providing the annular boss 200 , the structural strength around the installation position of the explosion-proof valve 400 is also improved, which is beneficial to protecting the explosion-proof valve 400 from being easily deformed by pressure and ensuring accurate valve opening pressure.

[0046] Optionally, the annular boss 200 in this embodiment includes two straight segments 210 and two arc segments 220, the two straight segments 210 are opposite to each other along the third direction, and the two arc segments 220 are opposite to each other along the second direction. Figure 1 In the Y-axis direction shown in , the third direction is perpendicular to both the first direction and the second direction.

[0047] The first injection hole 120 is arranged on one side of one of the arc segments 220 along the second direction, and the notch 211 is arranged on the straight segment 210 or the other arc segment 220, so that the notch 211 is arranged away from the first injection hole 120, so as to avoid the electrolyte from flowing from the notch 211 to the explosion-proof valve 400 as much as possible, which is conducive to protecting the explosion-proof valve 400 from corrosion. Exemplarily, at least one notch 211 can be arranged on each straight segment 210, and the notch 211 connects the first mounting hole 110 with the space on the side of the cover plate 100 away from the pole group. All the notches 211 together form a circulation channel for gas circulation. The cross-sectional area of ​​each notch 211 in the section parallel to the first direction and the second direction is S1, the number of notches 211 arranged on the annular boss 200 is n, and the total circulation area of ​​the circulation channel is S2, S2=n·S1. The value range of S2 is 0.3mm 2 -5mm 2 , thereby ensuring that the gas can pass smoothly through the gap 211 during the helium detection, which is beneficial to ensuring a high accuracy of the helium detection.

[0048] Subsequently, taking the example that each straight line segment 210 is provided with a notch 211, each notch 211 is arranged at the midpoint of the straight line segment 210 along the second direction. Of course, in other embodiments, the number and arrangement position of the notches 211 can also adopt other solutions, but it should be ensured that the position of the notch 211 is far from the first liquid injection hole 120.

[0049] See Figure 4 , Figure 5 and Figure 6 , in this embodiment, the shape of the notch 211 in the cross-section parallel to the first direction and the second direction is a rectangle, the dimension of the notch 211 along the second direction is a, and the value range of a is: 0.1 mm ≤ a ≤ 2 mm. For example, the value of a can be 0.1 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 2 mm, etc. By restricting the value of a within the above range, it is ensured that the cross-sectional area of each notch 211 in the cross-section parallel to the first direction and the second direction is large enough, and the gas can flow smoothly at the notch 211. Of course, in other embodiments, the shape of the notch 211 in the cross-section parallel to the first direction and the second direction can also be set to other shapes, such as trapezoid, triangle, circle, etc., as long as the cross-sectional area S1 of the notch 211 in the cross-section parallel to the first direction and the second direction is equal to that of the rectangular notch 211.

[0050] Further, see Figure 5 , Figure 7 and Figure 8 , a pole post 500 is integrated on the cover plate 100. Along the first direction, the height of the end face of the pole post 500 facing away from the electrode group protruding from the end face of the cover plate 100 facing away from the electrode group is h1, and the height of the end face of the annular boss 200 facing away from the electrode group protruding from the end face of the cover plate 100 facing away from the electrode group is h2. The value range of h1 is: 1 mm ≤ h1 ≤ 5 mm, and the value of h2 satisfies: 0.2 mm ≤ h2 ≤ 2h1 / 3. For example, when the value of h1 is 1 mm, the value of h2 can be 0.2 mm, 0.4 mm, 0.6 mm, etc. When the value of h1 is 3 mm, the value of h2 can be 0.2 mm, 0.6 mm, 1.0 mm, 1.5 mm, 2.0 mm, etc. When the value of h1 is 5 mm, the value of h2 can be 0.2 mm, 0.6 mm, 1.0 mm, 2.0 mm, 3.0 mm, etc. Through the above size restrictions, on the one hand, it is ensured that the pole post 500 and the annular boss 200 will not protrude too much from the end face of the cover plate 100 facing away from the electrode group, the structure of the battery is regular, and the probability of collision is reduced; on the other hand, it is also ensured that the height of the annular boss 200 along the first direction is sufficient to prevent the electrolyte from flowing to the explosion-proof valve protection piece 300 and then overflowing to the explosion-proof valve 400 to corrode the explosion-proof valve 400. Of course, the value of h2 should not be too large, otherwise the mechanical strength of the annular boss 200 itself will also decrease.

[0051] Further, along the first direction, the thickness of the explosion-proof valve protection piece 300 is δ, and the value range of δ is: 0.1 mm ≤ δ ≤ 1 mm. For example, the value of δ can be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1.0 mm, etc. Through the above size limitation, the mechanical strength of the explosion-proof valve protection piece 300 itself is ensured to be sufficient, and it can play a good protective role for the explosion-proof valve 400.

[0052] The width of the straight segment 210 of the annular boss 200 along the third direction is equal to the width of its arc segment 220 along the second direction, both are t, and the value range of t is: 0.5 mm ≤ t ≤ 2 mm. For example, the value of t can be 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2.0 mm, etc. By making the value of t within the above range, it is ensured that the annular boss 200 has sufficient mechanical strength and is reliably connected to the end face on the side of the cover plate 100 away from the electrode group, thereby playing a role in improving the structural strength around the first mounting hole 110.

[0053] Further, along the second direction, in this embodiment, the distance between the inner peripheral wall of the arc segment 220 of the annular boss 200 close to the first mounting hole 110 and the outer peripheral wall of the explosion-proof valve protection piece 300 is g1, and the value range of g1 is: 0.5t ≤ g1 ≤ t + 2 mm. For example, when the value of t is 0.5 mm, the value of g1 can be 0.25 mm, 0.5 mm, 1.0 mm, 2.0 mm, 2.5 mm, etc. When the value of t is 1.0 mm, the value of g1 can be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc. When the value of t is 2.0 mm, the value of g1 can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 4.0 mm, etc. By limiting the value of g1 within the above range, it is ensured that the contact area between the end face of the explosion-proof valve protection piece 300 facing the cover plate 100 and the end face of the annular boss 200 facing away from the cover plate 100 is large, and the bonding force by the back glue is large, and the explosion-proof valve protection piece 300 and the annular boss 200 are firmly fixed.

[0054] Similarly, along the third direction, in this embodiment, the distance between the inner peripheral wall of the straight segment 210 of the annular boss 200 close to the first mounting hole 110 and the outer peripheral wall of the explosion-proof valve protection piece 300 is g2, and g2 = g1.

[0055] Continue to refer to Figure 7A sink 130 is provided on the end surface of the cover plate 100 close to the pole group. The sink 130 is located in the circumferential direction of the first mounting hole 110. The sink 130 includes a side wall 132 and a bottom wall 131. The explosion-proof valve 400 includes a fixing portion 410. The end surface of the fixing portion 410 away from the pole group along the first direction abuts against the bottom wall 131. The circumferential side wall of the fixing portion 410 is welded to the side wall 132. The fixing portion 410 is used to fix the explosion-proof valve 400 to the cover plate 100. In addition, the arrangement of the sink 130 can save the internal space of the battery, which is beneficial to increase the layout space of the pole group and improve the energy density of the battery. The explosion-proof valve 400 also includes a main body 420, a fixing part 410 is arranged around the circumference of the main body 420, and a notched groove 421 is provided on the main body 420 along the second direction, and the distance between the notched groove 421 and the side of the station side wall 132 close to the fixing part 410 is f, and the value of f is greater than the width of the fixing part 410, so that the notched groove 421 can be exposed in the first mounting hole 110, which facilitates the high-temperature and high-pressure gas to act on the notched groove 421 and break through the notched groove 421, thereby realizing the pressure relief function of the explosion-proof valve 400. Exemplarily, the value range of f is: 2mm≤f≤5mm. For example, the value of f can be 2.0mm, 3.0mm, 4.0mm or 5.0mm, etc.

[0056] Furthermore, the distance between the inner circumferential wall of the annular boss 200 close to the first mounting hole 110 and the side of the notched groove 421 close to the fixing portion 410 is e, and the value range of e is: 0.5mm≤e≤3mm. For example, the value of e can be 0.5mm, 1.0mm, 2.0mm or 3.0mm, etc. By limiting the value of e within the above range, it is ensured that the annular boss 200 will not block the notched groove 421, so that the high-temperature and high-pressure gas can quickly break through the explosion-proof valve protection plate 300 during thermal runaway, and at the same time ensure smooth exhaust during pressure relief.

[0057] Continue to see Figure 5 and Figure 8In this embodiment, the cover plate 100 is further integrated with a first plastic part 600 and a second plastic part 700. The first plastic part 600 is arranged on the side of the cover plate 100 away from the pole group, and the second plastic part 700 is arranged on the side of the cover plate 100 close to the pole group. The pole 500 includes a first subsection 510 and a second subsection 520. The first subsection 510 includes a plate body 511, a first column 512 and a second column 513 connected in sequence. The diameter of the first column 512 is greater than the diameter of the second column 513. The second subsection 520 is provided with a second mounting hole 521, and a limiting step 522 is provided on the inner wall of the second mounting hole 521. The plate 511 is located on the side of the second plastic part 700 close to the pole group. The second column 513 passes through the second plastic part 700, the cover plate 100, the first plastic part 600 and the second mounting hole 521 of the second sub-part 520 and is riveted to the limiting step 522. The second column 513 expands along the radial direction of the second mounting hole 521 to form a convex portion 5131. The pole 500 is fixed to the cover plate 100 through the convex portion 5131 and the plate 511. Optionally, a sealing member 800 is further sleeved on the first column 512, and the sealing member 800 is sandwiched between the first column 512 and the cover plate 100. The gap between the pole 500 and the cover plate 100 is sealed by the sealing member 800.

[0058] Furthermore, a second injection hole 720 is provided on the second plastic part 700 at a position corresponding to the first injection hole 120 on the cover plate 100, and the second injection hole 720 is connected to the first injection hole 120, and the electrolyte can pass through the first injection hole 120 and the second injection hole 720 in sequence into the accommodating cavity of the battery, so that the electrolyte can immerse the electrode group. A plurality of air holes 710 are provided on the second plastic part 700 at a position corresponding to the explosion-proof valve 400 on the cover plate 100, and the air holes 710 connect the space on the side of the cover plate 100 close to the electrode group with the explosion-proof valve 400, so that when the battery is thermally runaway, the high-temperature and high-pressure gas can act on the explosion-proof valve 400 to open the valve to release pressure.

[0059] Continue to see Figure 4 , along the third direction, the distance between the side edge of the explosion-proof valve protection sheet 300 and the adjacent side edge of the cover plate 100 in this embodiment is b, and the value range of b is: b ≥ 2mm. For example, the value of b can be 2.0mm, 3.0mm, 4.0mm, 5.0mm, 8.0mm or 10.0mm, etc. By limiting the value of b within the above range, the distance between the side edge of the explosion-proof valve protection sheet 300 and the adjacent side edge of the cover plate 100 is far, so as to avoid the explosion-proof valve protection sheet 300 being damaged by heat due to welding of the cover plate 100 and the shell.

[0060] This embodiment also provides a battery, which includes a cover plate 100, a housing, a battery cell group, and an explosion-proof valve protection sheet 300. The cover plate 100 is connected to the housing to form a receiving cavity, and the battery cell group is disposed in the receiving cavity. The cover plate 100 and the explosion-proof valve protection sheet 300 are assembled by using the above-mentioned mounting structure of the explosion-proof valve protection sheet. By adopting the above-mentioned mounting structure of the explosion-proof valve protection sheet, first, it does not affect the airtightness detection of the explosion-proof valve 400 and there will be no missed inspection; second, it can prevent the electrolyte from flowing to the explosion-proof valve 400 through the first mounting hole 110, playing a good protective role for the explosion-proof valve 400; third, it can improve the structural strength around the mounting position of the explosion-proof valve 400, and the heat exchange area is increased by the setting of the annular boss 200, enhancing the heat dissipation capacity and reducing the adverse effect on the explosion-proof valve 400 during the peripheral welding of the cover plate 100 and the housing.

[0061] Embodiment Two

[0062] This embodiment also provides a battery, which is different from the battery in Embodiment One in that: in this embodiment, one of the side walls of the housing is a mounting plate, and one of the side walls of the housing is assembled with the explosion-proof valve protection sheet 300 by using the above-mentioned mounting structure of the explosion-proof valve protection sheet.

[0063] The remaining structures in this embodiment are the same as those in Embodiment One, and will not be described in detail here.

[0064] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An installation structure of an explosion-proof valve protection piece, characterized in that include: A mounting plate is arranged on one side of the electrode group, a first mounting hole and a first injection hole are arranged on the mounting plate, an annular boss is arranged in the circumference of the first mounting hole, the annular boss extends along a first direction, an end surface of the annular boss away from the electrode group is higher than an end surface of the mounting plate away from the electrode group, the first injection hole is arranged on one side of the annular boss along a second direction, a notch is arranged on a side of the annular boss away from the first injection hole, and the notch is communicated with the first mounting hole; An explosion-proof valve protection sheet connected to a side of the annular boss away from the pole group; An explosion-proof valve is connected to a side of the mounting plate close to the pole group. When the explosion-proof valve is opened, a pressure relief channel is formed. The pressure relief channel is communicated with the first mounting hole.

2. The installation structure of the explosion-proof valve protection piece according to claim 1, characterized in that, The mounting plate is integrated with a pole, and along the first direction, the end surface of the pole away from the pole group protrudes from the end surface of the mounting plate away from the pole group by a height of h1, and the end surface of the annular boss away from the pole group protrudes from the end surface of the mounting plate away from the pole group by a height of h2; Among them, the value of h2 satisfies: 0.2mm≤h2≤2h1 / 3; The value range of h1 is: 1mm≤h1≤5mm.

3. The installation structure of the explosion-proof valve protection piece according to claim 1, characterized in that, The dimension of the notch along the second direction is a, and the value range of a is: 0.1mm≤a≤2mm.

4. The mounting structure of the explosion-proof valve protection piece according to claim 1, characterized in that, The width of the annular boss is t, and the value range of t is: 0.5mm≤t≤2mm; and / or, the distance between the inner peripheral wall of the annular boss on the side close to the first mounting hole and the outer peripheral wall of the explosion-proof valve protection sheet is g1; The value range of g1 is: 0.5t≤g1≤t+2mm.

5. The installation structure of the explosion-proof valve protection piece according to claim 1, characterized in that A sinking platform is provided on the end face of the mounting plate close to the pole group, and the sinking platform includes a side wall and a bottom wall. The explosion-proof valve includes a fixing portion, and the end face of the fixing portion facing away from the pole group along the first direction abuts against the bottom wall of the platform, and the circumferential side wall of the fixing portion is welded to the side wall of the platform.

6. The installation structure of the explosion-proof valve protection piece according to claim 5, characterized in that, The explosion-proof valve also includes a main body, the fixing part is arranged around the circumference of the main body, and a notched groove is provided on the main body; along the second direction, the distance between the side of the notched groove close to the fixing part and the side wall of the platform is f, and the value range of f is: 2mm≤f≤5mm.

7. The installation structure of the explosion-proof valve protection piece according to claim 6, characterized in that, The distance between the inner circumferential wall of the annular boss on one side close to the first mounting hole and the side of the notched groove close to the fixing portion is e, and the value range of e is: 0.5mm≤e≤3mm.

8. The mounting structure of the explosion-proof valve protection piece according to claim 1, characterized in that, Along the third direction, the distance between the side edge of the explosion-proof valve protection sheet and the adjacent side edge of the mounting plate is b; The value range of b is: b≥2mm.

9. The installation structure of the explosion-proof valve protection piece according to claim 1, characterized in that, Along the first direction, the thickness of the explosion-proof valve protection sheet is δ, and the value range of δ is: 0.1mm≤δ≤1mm.

10. A battery, characterized in that, It comprises a cover plate, a shell, a pole group and an explosion-proof valve protection sheet, wherein the cover plate is connected to the shell and encloses a receiving cavity, the pole group is arranged in the receiving cavity, the cover plate is the mounting plate, and the cover plate and the explosion-proof valve protection sheet are assembled using the mounting structure of the explosion-proof valve protection sheet according to any one of claims 1 to 9; Or, one of the side walls of the housing is the mounting plate, and one of the side walls of the housing is assembled with the explosion-proof valve protection piece by using the mounting structure of the explosion-proof valve protection piece described in any one of claims 1-9.

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