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, and 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. The mounting plate is provided with a first mounting hole and a first liquid injection hole, the anti-explosion valve protection sheet comprises a base body and a supporting part connected to one side of the base body, and the side, away from the base body, of the supporting part is bonded with the mounting plate in the circumferential direction of the first mounting hole so as to lift the base body. The anti-explosion valve is connected to the side, away from the anti-explosion valve protection piece, of the mounting plate. The supporting part is provided with a compact air hole through which gas can pass, and the compact air hole can communicate the first mounting hole with the space of the side, away from the pole group, of the mounting plate, so that the helium detection accuracy is ensured. And meanwhile, the compact air holes can block liquid, overflowing electrolyte is prevented from permeating into the first mounting hole from the supporting part, and a good protection effect on the anti-explosion valve is achieved. The invention also provides a battery which comprises the mounting structure of the explosion-proof 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 matures, it is widely used as a power battery in electric vehicles and energy storage. A traditional lithium-ion battery structure consists of a cover, a housing, and an electrode assembly. The cover and housing are welded together to seal the electrode assembly. The cover is equipped with an injection port and an explosion-proof valve, through which electrolyte is injected into the housing. The explosion-proof valve is located on one side of the injection port to relieve pressure in the event of thermal runaway. A protective plate is installed above the explosion-proof valve to protect it from direct mechanical impact. A notch is provided in the protective plate to ensure the accuracy of helium testing.

[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. In addition, it is 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 ensures high accuracy of helium detection of the explosion-proof valve.

[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, wherein the mounting plate is provided with a first mounting hole and a first liquid injection hole, wherein the first liquid injection hole is provided on one side of the first mounting hole;

[0008] An explosion-proof valve protection sheet, comprising a base and a support portion, wherein the support portion is disposed on a side of the base close to the mounting plate, and a side of the support portion facing away from the base is bonded to the mounting plate circumferentially of the first mounting hole, the support portion having dense air holes for gas to pass through, and the dense air holes can block liquid;

[0009] The explosion-proof valve is connected to a side of the mounting plate away from the explosion-proof valve protection sheet. 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 first adhesive layer is provided on a side of the support portion close to the base, and two end surfaces of the first adhesive layer along a first direction are respectively bonded to the support portion and the base;

[0011] And / or, a second adhesive layer is provided on a side of the support portion facing away from the base body, and two end surfaces of the second adhesive layer along the first direction are respectively adhered to the support portion and the mounting plate.

[0012] Optionally, along the second direction, a distance between an outer peripheral wall of the support portion and an inner wall of the first mounting hole is a, and a has a value range of 0.5 mm ≤ a ≤ 3.0 mm.

[0013] Optionally, along the second direction, the width of the support portion is t, and the value range of t is: a≤t≤a+2mm.

[0014] Optionally, along the second direction, a distance between an outer peripheral wall of the base and an outer peripheral wall of the support portion is c, and a value range of c is: 0 mm ≤ c ≤ 2.0 mm.

[0015] Optionally, the thickness of the base along the first direction is δ1, the thickness of the support portion along the first direction is δ2, the thickness of the first adhesive layer along the first direction is δ3, and the thickness of the second adhesive layer along the first direction is δ4;

[0016] The value range of δ1 is: 0.1mm≤δ1≤1.0mm;

[0017] The value range of δ2 is: 0.1mm≤δ2≤3.0mm;

[0018] The value range of δ3 is: 0.02mm≤δ3≤0.1mm;

[0019] The value range of δ4 is: 0.02mm≤δ4≤0.1mm.

[0020] Optionally, the mounting plate is provided on one side of the pole group, and a pole is integrated on the mounting plate. Along the first direction, an end face of the pole facing away from the pole group protrudes from an end face of the mounting plate facing away from the pole group by a height H1;

[0021] H1 and δ1, δ2, δ3, δ4 satisfy: H1 ≥ δ1 + δ2 + δ3 + δ4.

[0022] Optionally, a notch is provided on a side of the support portion facing away from the first liquid injection hole, the notch passes through the support portion, and the notch is communicated with the first mounting hole.

[0023] Optionally, the support portion is made of foam.

[0024] In another aspect, the present invention provides a battery comprising a cover plate, a housing, an electrode group, and an explosion-proof valve protection sheet, wherein the cover plate is connected to the housing and encloses an accommodating cavity, the electrode group is disposed in the accommodating cavity, the cover plate serves as the mounting plate, and the cover plate and the explosion-proof valve protection sheet are assembled using the mounting structure for the explosion-proof valve protection sheet in any of the above-mentioned solutions;

[0025] Alternatively, one of the side walls of the housing serves as the mounting plate, and one of the side walls of the housing 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.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a mounting structure for an explosion-proof valve protective plate, comprising a mounting plate, an explosion-proof valve protective plate, and an explosion-proof valve. A first mounting hole and a first liquid injection hole are provided on the mounting plate. The explosion-proof valve protective plate comprises a base and a support portion connected to one side of the base. The side of the support portion facing away from the base is bonded to the mounting plate circumferentially of the first mounting hole, thereby raising the base. The explosion-proof valve is connected to the side of the mounting plate facing away from the explosion-proof valve protective plate. When the explosion-proof valve is opened, a pressure relief channel is formed, and the pressure relief channel is connected to the first mounting hole. The support portion has dense air vents for gas to pass through. The dense air vents allow gas to pass through the support portion to connect the first mounting hole with the space on the side of the mounting plate facing away from the electrode group, thereby ensuring the accuracy of helium detection. In addition, the dense air vents can block liquid, thereby preventing overflowing electrolyte from seeping from the support portion into the first mounting hole, thereby providing good protection for the explosion-proof valve.

[0028] The present invention also provides a battery comprising a cover plate, a housing, an electrode group, and an explosion-proof valve protection sheet. One of the side walls of the cover plate or housing serves as a mounting plate, and one of the side walls of the cover plate or housing and the explosion-proof valve protection sheet are assembled using the aforementioned explosion-proof valve protection sheet mounting structure. By employing the aforementioned explosion-proof valve protection sheet mounting structure, the airtightness testing of the explosion-proof valve is not affected, preventing any missed inspections. Furthermore, the structure prevents electrolyte from flowing into the explosion-proof valve, providing excellent protection for the explosion-proof valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0030] Figure 1 This is an exploded view of the installation structure of the explosion-proof valve protection sheet in Example 1 of the present invention;

[0031] Figure 2This is an exploded view of the installation structure of the explosion-proof valve protection sheet in Example 1 of the present invention from another perspective;

[0032] Figure 3 This is a schematic structural diagram of the explosion-proof valve protection sheet in Example 1 of the present invention;

[0033] Figure 4 This is a top view of the installation structure of the explosion-proof valve protection sheet in Example 1 of the present invention;

[0034] Figure 5 for Figure 4 Cross-sectional view of the middle AA section;

[0035] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0036] Figure 7 for Figure 5 A partial enlarged view of point D in the middle;

[0037] Figure 8 A partial enlargement of the installation structure of the explosion-proof valve protection plate in Example 2 of the present invention Figure 1 ;

[0038] Figure 9 A partial enlargement of the installation structure of the explosion-proof valve protection plate in Example 2 of the present invention Figure 2 ;

[0039] Figure 10 A partial enlargement of the installation structure of the explosion-proof valve protection plate in Example 2 of the present invention Figure 3 .

[0040] In the picture:

[0041] 100. Cover plate; 110. First mounting hole; 120. First injection hole; 130. Sink; 200. Explosion-proof valve protection plate; 210. Base; 220. Support portion; 221. Straight segment; 222. Arc segment; 2221. Notch; 230. First adhesive layer; 240. Second adhesive layer; 300. Explosion-proof valve; 310. Fixing portion; 320. Main body; 321. Notched groove; 400. Pole; 410. First subdivision; 411. Plate; 412. First column; 413. Second column; 4131. Protrusion; 420. Second subdivision; 421. Second mounting hole; 422. Limiting step; 500. First plastic part; 600. Second plastic part; 610. Air hole; 620. Second injection hole; 700. Sealing part. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0045] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0046] Example 1

[0047] like Figure 1-Figure 3As shown, this embodiment provides a mounting structure for an explosion-proof valve protection sheet, which includes a cover plate 100, an explosion-proof valve protection sheet 200, and an explosion-proof valve 300. In this embodiment, the battery cover plate 100 is used as an example mounting plate. The cover plate 100 and the explosion-proof valve protection sheet 200 are assembled using the above-described explosion-proof valve protection sheet mounting structure.

[0048] Specifically, the cover plate 100 is disposed on one side of the electrode assembly and is provided with a first mounting hole 110 and a first liquid injection hole 120. The first liquid injection hole 120 is disposed on one side of the first mounting hole 110. The explosion-proof valve protection sheet 200 is disposed on the side of the cover plate 100 facing away from the electrode assembly. The explosion-proof valve protection sheet 200 comprises a base 210 and a support portion 220. The support portion 220 is disposed on the side of the base 210 near the cover plate 100. The side of the support portion 220 facing away from the base 210 is bonded to the cover plate 100 circumferentially in the direction of the first mounting hole 110. The support portion 220 protrudes from the end surface of the cover plate 100 facing away from the electrode assembly, thereby elevating the base 210. The explosion-proof valve 300 is connected to the side of the cover plate 100 facing away from the explosion-proof valve protection sheet 200. When the explosion-proof valve 300 is opened, a pressure relief channel is formed, which is connected to the first mounting hole 110. Therefore, when thermal runaway occurs in the battery, the explosion-proof valve 300 will open, 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 300, and then break through the explosion-proof valve protection sheet 200 and release it into the space on the side of the cover plate 100 away from the electrode group, thereby achieving pressure relief.

[0049] Among them, the support part 220 of the explosion-proof valve protection sheet 200 in this embodiment has dense air holes 610 for gas to pass through. The dense air holes 610 connect the first mounting hole 110 with the space on the side of the cover plate 100 away from the electrode group. The dense air holes 610 can allow gas to pass through the support part 220. When the welding quality between the explosion-proof valve 300 and the cover plate 100 is poor and the sealing does not meet the requirements, it can be detected through helium inspection, ensuring that the accuracy of the helium inspection of the explosion-proof valve 300 is high and the battery has good sealing. In addition, the dense air holes 610 can block liquid, and the electrolyte cannot pass through the support part 220 into the first mounting hole 110, thereby preventing the electrolyte overflowing when injecting liquid into the battery accommodating cavity through the first injection hole 120 from seeping into the first mounting hole 110 from the support part 220 between the base 210 and the cover plate 100, and then flowing to the explosion-proof valve 300, causing the explosion-proof valve 300 to be corroded, thereby providing good protection for the explosion-proof valve 300.

[0050] For example, the material of the support portion 220 in this embodiment may be foam, and the material of the base 210 may be one of PET, PI, PP or PE.

[0051] See also Figure 4-Figure 6In this embodiment, a first adhesive layer 230 is provided on the side of the support portion 220 close to the base 210. The two end surfaces of the first adhesive layer 230 along the first direction are respectively bonded to the support portion 220 and the base 210. The support portion 220 and the base 210 are bonded and fixed by the first adhesive layer 230. A second adhesive layer 240 is provided on the side of the support portion 220 away from the base 210. The two end surfaces of the second adhesive layer 240 along the first direction are respectively bonded to the support portion 220 and the cover plate 100. The support portion 220 and the cover plate 100 are bonded and fixed by the second adhesive layer 240. The first direction is Figure 5 The Z-axis direction shown in .

[0052] Optionally, the support portion 220 in this embodiment is in the shape of a runway, and the support portion 220 includes two straight segments 221 and two arc segments 222. The two arc segments 222 are arranged relative to each other along the second direction, and the two straight segments 221 are arranged relative to each other along the third direction. The first injection hole 120 is arranged on one side of one of the arc segments 222 along the second direction. The shape of the first adhesive layer 230 and the second adhesive layer 240 is the same as that of the support portion 220, and the width of the first adhesive layer 230 and the width of the second adhesive layer 240 are both equal to the width of the support portion 220. The side edges of the first adhesive layer 230 and the second adhesive layer 240 in the width direction are flush with the side edges of the support portion 220 in the width direction. Wherein, the second direction is as follows: Figure 4 The X-axis direction shown in the figure, the third direction is as follows Figure 4 The Y-axis direction shown in .

[0053] Along the second direction, the distance a between the outer peripheral wall of the arcuate segment 222 of the support portion 220 and the inner wall of the first mounting hole 110 is defined as "a." The value of a ranges from 0.5 mm to 3.0 mm. For example, the value of a can be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, or 3.0 mm. By limiting the value of a to this range, the bonding area between the support portion 220 and the cover plate 100 is increased, thereby ensuring that the explosion-proof valve protection sheet 200 is effectively fixed to the cover plate 100, preventing the explosion-proof valve protection sheet 200 from falling off the cover plate 100, and improving reliability.

[0054] Along the second direction, the distance c between the outer circumferential wall of the base 210 and the outer circumferential wall of the arcuate segment 222 of the support portion 220 is 0 mm ≤ c ≤ 2.0 mm. Limiting the value of c to this range not only increases the bonding area between the support portion 220 and the base 210, ensuring a reliable connection between the two, but also reduces the size of the base 210, saving materials and lowering costs.

[0055] Furthermore, along the second direction, the width of the arc segment 222 of the support portion 220 is t, and the value range of t is: a≤t≤a+2mm. For example, when the value of a is 0.5mm, the value of t can be 0.5mm, 1.5mm or 2.5mm, etc. When the value of a is 1.0mm, the value of t can be 1.0mm, 2.0mm or 3.0mm, etc. When the value of a is 3.0mm, the value of t can be 3.0mm, 4.0mm or 5.0mm, etc. By limiting the value of t to the above range, it is ensured that the bonding area between the support portion 220 and the base 210 is large, thereby ensuring that the support portion 220 is well fixed on the base 210, avoiding separation of the base 210 and the support portion 220, and the connection between the base 210 and the support portion 220 is stable and reliable.

[0056] It should be noted that, along the third direction, the distance between the outer peripheral wall of the straight segment 221 of the support portion 220 and the inner wall of the first mounting hole 110 is also a. Along the third direction, the distance between the outer peripheral wall of the base 210 and the outer peripheral wall of the straight segment 221 of the support portion 220 is also c. Along the third direction, the width of the straight segment 221 of the support portion 220 is also t.

[0057] Continue to see Figure 6 and Figure 7 The thickness of the base 210 along the first direction is δ1, the thickness of the support portion 220 along the first direction is δ2, the thickness of the first adhesive layer 230 along the first direction is δ3, and the thickness of the second adhesive layer 240 along the first direction is δ4. In other words, the distance between the end surface of the base 210 facing away from the support portion 220 and the end surface of the cover plate 100 facing the support portion 220 is δ1+δ2+δ3+δ4.

[0058] Optionally, the value range of δ1 is: 0.1mm≤δ1≤1.0mm. For example, the value of δ1 can be 0.1mm, 0.2mm, 0.5mm, 0.8mm or 1.0mm, etc. By limiting the value of δ1 within the above range, it is ensured that the mechanical strength of the substrate 210 itself is high, and reliable protection of the explosion-proof valve 300 can be achieved. Furthermore, the value range of δ2 is: 0.1mm≤δ2≤3.0mm. For example, the value of δ2 can be 0.1mm, 0.5mm, 1.5mm, 2.0mm, 2.5mm or 3.0mm, etc. By limiting the value of δ2 within the above range, it is ensured that the height of the substrate 210 is lifted is sufficient to prevent the electrolyte from overflowing to the explosion-proof valve 300, and it is also ensured that the support part 220 can meet the needs of gas circulation during helium detection.

[0059] Optionally, the value range of δ3 is: 0.02mm≤δ3≤0.1mm. For example, the value of δ3 can be 0.02mm, 0.05mm, 0.08mm or 0.1mm, etc. The value range of δ4 is: 0.02mm≤δ4≤0.1mm. For example, the value of δ4 can be 0.02mm, 0.05mm, 0.08mm or 0.1mm, etc. In some embodiments, δ3=δ4 can be set. The values of δ3 and δ4 should not be too large, otherwise the adhesive layer will be too thick, which is not conducive to air permeability (the function of gas circulation is realized by the support part 220). Of course, the values of δ3 and δ4 should not be too small, otherwise the amount of the first adhesive layer 230 and the second adhesive layer 240 will be insufficient, and the support part 220 cannot be firmly fixed to the base 210 and the cover plate 100, and the reliability is reduced.

[0060] Optionally, the cover plate 100 is disposed on one side of the electrode assembly, and the electrode post 400 is integrated on the cover plate 100. Along the first direction, the end surface of the electrode post 400 facing away from the electrode assembly protrudes above the end surface of the cover plate 100 facing away from the electrode assembly by a height H1. H1 and δ1, δ2, δ3, and δ4 satisfy the following relationship: H1 ≥ δ1 + δ2 + δ3 + δ4. In other words, the end surface of the base 210 facing away from the support portion 220 does not protrude above the end surface of the electrode post 400 facing away from the electrode assembly, thereby ensuring a relatively regular appearance of the battery and minimizing damage to the base 210 caused by bumps.

[0061] Continue to see Figure 5-Figure 7 The end surface of the cover plate 100 near the electrode group is provided with a recessed platform 130. The recessed platform 130 is located circumferentially around the first mounting hole 110. The explosion-proof valve 300 includes a fixing portion 310. The end surface of the fixing portion 310 facing away from the electrode group along the first direction abuts against the bottom wall of the recessed platform 130. The circumferential sidewalls of the fixing portion 310 are welded to the sidewalls of the recessed platform 130. The fixing portion 310 secures the explosion-proof valve 300 to the cover plate 100. The provision of the recessed platform 130 saves internal battery space, increases the layout space for the electrode group, and improves the battery's energy density. The explosion-proof valve 300 also includes a main body 320. The fixing portion 310 is disposed circumferentially around the main body 320. A notched groove 321 is provided on the main body 320. Along the second direction, the distance between the side of the notched groove 321 close to the fixing part 310 and the side wall of the sinking platform 130 is greater than the width of the fixing part 310, so that the notched groove 321 can be exposed in the first mounting hole 110, making it convenient for high-temperature and high-pressure gas to act on the notched groove 321 and break through the notched groove 321, thereby realizing the pressure relief function of the explosion-proof valve 300.

[0062] Furthermore, in this embodiment, the cover plate 100 is integrated with a first plastic part 500 and a second plastic part 600. The first plastic part 500 is disposed on the side of the cover plate 100 facing away from the electrode assembly, and the second plastic part 600 is disposed on the side of the cover plate 100 closer to the electrode assembly. The pole 400 includes a first subsection 410 and a second subsection 420. The first subsection 410 includes a plate 411, a first column 412, and a second column 413 connected in sequence. The diameter of the first column 412 is larger than that of the second column 413. The second subsection 420 is provided with a second mounting hole 421, and the inner wall of the second mounting hole 421 is provided with a limiting step 422. The plate 411 is located on the side of the second plastic part 600 near the electrode group. The second column 413 passes through the second plastic part 600, the cover plate 100, the first plastic part 500, and the second mounting hole 421 of the second subsection 420, and is riveted to the limiting step 422. The second column 413 expands radially along the second mounting hole 421 to form a protrusion 4131. The protrusion 4131 and the plate 411 secure the electrode 400 to the cover plate 100. Optionally, a seal 700 is further sleeved on the first column 412 and sandwiched between the first column 412 and the cover plate 100 to seal the gap between the electrode 400 and the cover plate 100.

[0063] Furthermore, a second injection hole 620 is provided on the second plastic part 600 at a position corresponding to the first injection hole 120 on the cover plate 100. The second injection hole 620 is connected to the first injection hole 120, allowing electrolyte to enter the battery's accommodating cavity through the first and second injection holes 120, 620, respectively, so that the electrolyte can submerge the electrode assembly. Several air holes 610 are provided on the second plastic part 600 at positions corresponding to the explosion-proof valve 300 on the cover plate 100. The air holes 610 connect the space on the side of the cover plate 100 near the electrode assembly with the explosion-proof valve 300. This allows high-temperature, high-pressure gas to act on the explosion-proof valve 300 in the event of thermal runaway of the battery, causing it to open and release pressure.

[0064] Continue to see Figure 4 Along the third direction, the distance between the side edge of the base 210 of the explosion-proof valve protection sheet 200 and the adjacent side edge of the cover plate 100 in this embodiment is b, and the value of b ranges from b ≥ 2 mm. For example, the value of b can be 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm, 8.0 mm, or 10.0 mm. By limiting the value of b to this range, the distance between the side edge of the base 210 of the explosion-proof valve protection sheet 200 and the adjacent side edge of the cover plate 100 is greater, thereby preventing damage to the explosion-proof valve protection sheet 200 from heat generated by welding the cover plate 100 to the housing.

[0065] This embodiment also provides a battery comprising a cover plate 100, a housing, an electrode group, and an explosion-proof valve protection sheet 200. The cover plate 100 is connected to the housing and encloses a housing cavity, within which the electrode group is disposed. The cover plate 100 and explosion-proof valve protection sheet 200 are assembled using the aforementioned explosion-proof valve protection sheet mounting structure. This explosion-proof valve protection sheet mounting structure does not affect the airtightness testing of the explosion-proof valve 300, ensuring high helium testing accuracy and preventing missed detections. It also prevents electrolyte from flowing into the explosion-proof valve 300, providing excellent protection for the valve 300.

[0066] Example 2

[0067] This embodiment provides a mounting structure for an explosion-proof valve protection plate, see Figures 8-10 This embodiment differs from the mounting structure of the explosion-proof valve protective plate in Example 1 in that the first liquid injection hole 120 is located on one side of an arcuate segment 222 of the support portion 220 along the second direction. A notch 2221 is provided in the arcuate segment 222 of the support portion 220, facing away from the first liquid injection hole 120. The notch 2221 extends through the support portion 220 along the second direction and communicates with the first mounting hole 110. The notch 2221 also allows gas to circulate, thereby ensuring the accuracy of the helium detection of the explosion-proof valve 300. It also prevents electrolyte from overflowing into the explosion-proof valve 300 through the notch 2221, providing effective protection for the explosion-proof valve 300.

[0068] Optionally, along the first direction, the notch 2221 can be provided on a side of the support portion 220 facing away from the cover plate 100, and the notch 2221 does not penetrate the support portion 220 along the first direction. In some embodiments, along the first direction, the notch 2221 can also be provided on a side of the support portion 220 close to the cover plate 100, and the notch 2221 does not penetrate the support portion 220 along the first direction. In some embodiments, the notch 2221 can be provided in the middle of the support portion 220 along the first direction, and the notch 2221 does not penetrate the support portion 220 along the first direction.

[0069] Alternatively, in some embodiments, the notch 2221 may be provided on the straight segment 221 of the support portion 220. In this case, the notch 2221 penetrates the support portion 220 along the third direction, and the notch 2221 communicates with the first mounting hole 110. Along the first direction, the notch 2221 may also be provided on the side of the support portion 220 facing away from the cover plate 100, on the side of the support portion 220 close to the cover plate 100, or in the middle of the support portion 220 along the first direction, and the notch 2221 does not penetrate the support portion 220 along the first direction.

[0070] The rest of the structure of the installation structure of the explosion-proof valve protection plate in this embodiment is the same as that in the first embodiment, and will not be described in detail here.

[0071] Example 3

[0072] This embodiment also provides a mounting structure for an explosion-proof valve protection plate. This differs from the mounting structure for the explosion-proof valve protection plate in Example 1 in that one of the housing's sidewalls serves as the mounting plate, and the housing's sidewall and explosion-proof valve protection plate 200 are assembled using the aforementioned mounting structure. This mounting structure ensures that the airtightness testing of the explosion-proof valve 300 is not affected, ensuring high helium testing accuracy and preventing missed detections. It also prevents electrolyte from flowing into the explosion-proof valve 300, effectively protecting the explosion-proof valve 300.

[0073] The rest of the structure of the installation structure of the explosion-proof valve protection plate in this embodiment is the same as that in the first embodiment, and will not be described in detail here.

[0074] This embodiment also provides a battery, including the above-mentioned installation structure of the explosion-proof valve protection sheet.

[0075] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An installation structure for an explosion-proof valve protection sheet, characterized in that: include: A mounting plate, wherein the mounting plate is provided with a first mounting hole and a first liquid injection hole, wherein the first liquid injection hole is provided on one side of the first mounting hole; An explosion-proof valve protection sheet, comprising a base and a support portion, wherein the support portion is disposed on a side of the base close to the mounting plate, and a side of the support portion facing away from the base is bonded to the mounting plate circumferentially of the first mounting hole, the support portion having dense air holes for gas to pass through, and the dense air holes can block liquid; The explosion-proof valve is connected to a side of the mounting plate away from the explosion-proof valve protection sheet. 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 sheet according to claim 1, characterized in that: A first adhesive layer is provided on a side of the support portion close to the base, and two end surfaces of the first adhesive layer along a first direction are respectively bonded to the support portion and the base; And / or, a second adhesive layer is provided on a side of the support portion facing away from the base body, and two end surfaces of the second adhesive layer along the first direction are respectively adhered to the support portion and the mounting plate.

3. The installation structure of the explosion-proof valve protection sheet according to claim 2, characterized in that: Along the second direction, the distance between the outer peripheral wall of the support portion and the inner wall of the first mounting hole is a; The value range of a is: 0.5mm≤a≤3.0mm.

4. The installation structure of the explosion-proof valve protection sheet according to claim 2, characterized in that: Along the second direction, the width of the support portion is t, and the value range of t is: a≤t≤a+2mm.

5. The installation structure of the explosion-proof valve protection sheet according to claim 2, characterized in that: Along the second direction, the distance between the outer peripheral wall of the base and the outer peripheral wall of the support portion is c; The value range of c is: 0mm≤c≤2.0mm.

6. The installation structure of the explosion-proof valve protection sheet according to claim 2, characterized in that: The thickness of the base along the first direction is δ1, the thickness of the support portion along the first direction is δ2, the thickness of the first adhesive layer along the first direction is δ3, and the thickness of the second adhesive layer along the first direction is δ4; The value range of δ1 is: 0.1mm≤δ1≤1.0mm; The value range of δ2 is: 0.1mm≤δ2≤3.0mm; The value range of δ3 is: 0.02mm≤δ3≤0.1mm; The value range of δ4 is: 0.02mm≤δ4≤0.1mm.

7. The installation structure of the explosion-proof valve protection sheet according to claim 6, characterized in that: The mounting plate is arranged on one side of the pole group, and a pole is integrated on the mounting plate. Along the first direction, the end surface of the pole facing away from the pole group protrudes from the end surface of the mounting plate facing away from the pole group by a height H1; H1 and δ1, δ2, δ3, δ4 satisfy: H1 ≥ δ1 + δ2 + δ3 + δ4.

8. The installation structure of the explosion-proof valve protection sheet according to claim 1, characterized in that: A notch is provided on a side of the support portion facing away from the first liquid injection hole. The notch passes through the support portion and is communicated with the first mounting hole.

9. The installation structure of the explosion-proof valve protection sheet according to any one of claims 1 to 8, characterized in that: The support part is made of foam.

10. A battery, characterized in that: The device comprises a cover plate, a housing, an electrode group, and an explosion-proof valve protection sheet, wherein the cover plate is connected to the housing and encloses an accommodating cavity, the electrode group is disposed in the accommodating cavity, the cover plate serves as the mounting plate, and the cover plate and the explosion-proof valve protection sheet are assembled using the mounting structure for the explosion-proof valve protection sheet according to any one of claims 1 to 9; Alternatively, one of the side walls of the housing serves as the mounting plate, and one of the side walls of the housing 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.

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