Battery

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a battery which comprises a shell, an anti-explosion valve protection sheet and an anti-explosion valve, the shell is provided with a mounting hole and a first liquid injection hole. The anti-explosion valve protection piece is arranged on the side, away from the containing cavity, of the shell and comprises a base body and an adhesive layer, the adhesive layer is arranged on the side, close to the shell, of the base body and connects the base body with the shell, and the base body and the shell are fixed through the adhesive layer. A first avoiding edge is arranged on the side, away from the first liquid injection hole, of the base body, and a circulation opening is formed between the first avoiding edge and the inner wall of the mounting hole. The anti-explosion valve is connected to the side, away from the anti-explosion valve protection piece, of the shell. When the explosion-proof valve is opened, a pressure relief channel is formed, and the pressure relief channel is sequentially communicated with the mounting hole and the circulation opening. Due to the existence of the circulation port, the helium detection accuracy of the explosion-proof valve can be ensured to be high. The rubber layer is provided with the identification part, so that the explosion-proof valve protection sheet can be visually detected and judged after being installed on the shell, and the situation that the explosion-proof valve protection sheet is neglected to be installed is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage. A traditional lithium battery structure includes a cover plate, a casing, and electrode arrays. The cover plate and casing are welded and sealed to encapsulate the electrode arrays internally. The cover plate has an injection port, a rupture port, and an explosion-proof valve. Electrolyte is injected into the casing through the injection port. The rupture port is located on one side of the injection port, and the explosion-proof valve is located inside the rupture port for pressure relief in case of thermal runaway. An explosion-proof valve protection plate is located above the explosion-proof valve to protect it from direct mechanical impact. The explosion-proof valve protection plate has a notch to ensure the accuracy of helium detection.

[0003] However, during the battery assembly process, there are instances where the explosion-proof valve protection plate is missing, causing electrolyte to flow from the rupture hole to the explosion-proof valve, resulting in corrosion and failure of the explosion-proof valve in the air. Moreover, cleaning the electrolyte on the explosion-proof valve is also quite difficult. Utility Model Content

[0004] The purpose of this invention is to provide a battery that can prevent the explosion-proof valve protection plate from being missing, thereby preventing the explosion-proof valve from being corroded by the electrolyte, providing good protection for the explosion-proof valve, and ensuring high accuracy of the explosion-proof valve helium detection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a battery, comprising:

[0007] The outer shell has a hollow interior forming a receiving cavity. The outer shell is provided with a mounting hole and a first liquid injection hole, and the first liquid injection hole is located on one side of the mounting hole along a first direction.

[0008] An explosion-proof valve protection plate is disposed on the side of the housing away from the receiving cavity. The explosion-proof valve protection plate includes a substrate and an adhesive layer. The adhesive layer is disposed on the side of the substrate close to the housing and connects the substrate to the housing. The adhesive layer has an identification portion. A first clearance edge is provided on the side of the substrate away from the first injection hole. A flow port is formed between the first clearance edge and the inner wall of the mounting hole.

[0009] An explosion-proof valve is connected to the side of the housing away from the explosion-proof valve protection plate. When the explosion-proof valve is opened, it forms a pressure relief channel, which is sequentially connected to the mounting hole and the flow port.

[0010] Optionally, the adhesive layer includes two straight segments and two arc segments. The two straight segments are arranged opposite each other along a second direction, and the two arc segments are arranged opposite each other along a first direction. The outer peripheral wall of the arc segment that is away from the first injection hole is provided with a second clearance edge. The second clearance edge, the first clearance edge, and the inner wall of the mounting hole together form the flow port.

[0011] Optionally, along the first direction, the distance between the first clearance edge, the second clearance edge and the inner peripheral wall of the arc segment is b, and the value of b is in the range of 0.1mm≤b≤3.0mm.

[0012] Optionally, along the first direction, the distance between the first clearance edge, the second clearance edge and the inner wall of the mounting hole is e, and the value of e is in the range of 0.1mm≤e≤2.0mm.

[0013] Optionally, along the first direction, the distance between the outer peripheral wall of the arc segment closest to the first injection hole and the outer peripheral wall of the substrate is a;

[0014] The range of values ​​for a is: 0mm≤a≤1.0mm.

[0015] Optionally, along the first direction, the width of the bonding surface between the arc segment closest to the first injection hole and the outer shell of the two arc segments is c, and the value of c is in the range of 0.5mm≤c≤2.5mm.

[0016] Optionally, along the first direction, the width of the arc segment closest to the first injection hole in the two arc segments is t1, and the value range of t1 is: 0.8mm≤t1≤3.0mm;

[0017] And / or, along the second direction, the width of the straight line segment is t2, t1 = t2.

[0018] Optionally, along a third direction, the thickness of the substrate is h1, and the thickness of the adhesive layer is h2;

[0019] The value range of h1 is: 0.1mm ≤ h1 ≤ 1.0mm;

[0020] The value range of h2 is: 0.02mm≤h2≤0.5mm.

[0021] Optionally, the substrate is made of a transparent material, and the marking portion is the marking color inherent in the adhesive layer itself.

[0022] Optionally, the outer casing includes a cover plate and a housing, the cover plate being connected to the housing and forming the accommodating cavity, and one side wall of the cover plate or the housing being provided with the mounting hole and the first injection hole.

[0023] The beneficial effects of this utility model are as follows:

[0024] This utility model provides a battery, including a casing, an explosion-proof valve protection plate, and an explosion-proof valve. The casing has a mounting hole and a first injection hole. The explosion-proof valve protection plate is disposed on the side of the casing away from the receiving cavity. The explosion-proof valve protection plate includes a substrate and an adhesive layer. The adhesive layer is disposed on the side of the substrate near the casing and connects the substrate to the casing, fixing the substrate to the casing through the adhesive layer. A first clearance edge is provided on the side of the substrate away from the first injection hole, forming a flow port between the first clearance edge and the inner wall of the mounting hole. The explosion-proof valve is connected to the side of the casing away from the explosion-proof valve protection plate by welding. When the explosion-proof valve is opened, a pressure relief channel is formed, which is sequentially connected to the mounting hole and the flow port. Due to the presence of the flow port, the accuracy of helium detection of the explosion-proof valve is ensured to be high. Furthermore, the adhesive layer has a marking portion, allowing for intuitive detection and identification of the explosion-proof valve protection plate after it is installed on the casing, avoiding the possibility of the explosion-proof valve protection plate being missing. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0026] Figure 1 This is an exploded view of the battery (casing not shown) in Embodiment 1 of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the explosion-proof valve protection plate in Embodiment 1 of this utility model;

[0028] Figure 3 This is a top view of the battery (casing not shown) in Embodiment 1 of this utility model;

[0029] Figure 4 for Figure 3 Cross-sectional view of section AA;

[0030] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0031] Figure 6 for Figure 4 A magnified view of a section at point D;

[0032] Figure 7 for Figure 3 A magnified view of a section at point E in the middle.

[0033] In the picture:

[0034] 100, Cover plate; 110, Mounting hole; 120, First injection hole; 130, Settled platform; 200, Explosion-proof valve protective plate; 210, Substrate; 211, First clearance edge; 2111, Flow port; 220, Adhesive layer; 221, Straight section; 222, Arc section; 2221, Second clearance edge; 300, Explosion-proof valve; 310, Fixing part; 320, Body part; 321, Scoring groove; 400, Plastic part; 410, Air hole; 422, Second injection hole. Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] Example 1

[0040] like Figures 1-5 As shown, this embodiment provides a battery, which includes a casing, an explosion-proof valve protection plate 200, and an explosion-proof valve 300. The casing includes a cover plate 100 and a housing, with the cover plate 100 connected to the housing and forming a cavity for placing the electrode assembly.

[0041] In this embodiment, the cover plate 100 is provided with a mounting hole 110 and a first injection hole 120 as an example. The first injection hole 120 is provided along the first direction of the mounting hole 110. Figure 3 (shown in the X-axis direction). The explosion-proof valve protection plate 200 is disposed on the side of the cover plate 100 away from the receiving cavity. The explosion-proof valve protection plate 200 includes a substrate 210 and an adhesive layer 220. The adhesive layer 220 is disposed on the side of the substrate 210 near the outer shell and connects the substrate 210 to the outer shell. The adhesive layer 220 fixes the substrate 210 to the cover plate 100. A first clearance edge 211 is provided on the side of the substrate 210 away from the first injection hole 120. The first clearance edge 211 forms a flow port 2111 between the first clearance edge 211 and the inner wall of the mounting hole 110. The explosion-proof valve 300 is connected to the side of the cover plate 100 away from the explosion-proof valve protection plate 200 by welding. When the explosion-proof valve 300 is opened, a pressure relief channel is formed, which is sequentially connected to the mounting hole 110 and the flow port 2111.

[0042] Therefore, in the event of thermal runaway in the battery, the explosion-proof valve 300 will open, allowing the high-temperature, high-pressure gas inside the battery to enter the mounting hole 110 through the pressure relief channel of the explosion-proof valve 300. This gas then forces its way through the explosion-proof valve protection plate 200 and into the space on the side of the cover plate 100 away from the electrode assembly, thus achieving pressure relief. Furthermore, the presence of the flow port 2111 allows gas to pass through it. If the welding quality between the explosion-proof valve 300 and the cover plate 100 is poor, and the seal does not meet requirements, this can be detected by helium testing, ensuring high accuracy of the helium testing of the explosion-proof valve 300 and good battery sealing.

[0043] Furthermore, the adhesive layer 220 in this embodiment has an identification portion. This identification portion allows for direct detection and identification after the explosion-proof valve protection plate 200 is installed on the cover plate 100, preventing any omissions. Thus, the explosion-proof valve protection plate 200 can block the electrolyte, preventing corrosion of the explosion-proof valve 300 and providing good protection. For example, the substrate 210 in this embodiment can be made of PET, PI, PP, or PE. The substrate 210 is made of a transparent material, and the identification portion is the identification color inherent to the adhesive layer 220 itself. For example, the identification color of the adhesive layer 220 can be set to blue. Therefore, whether the explosion-proof valve protection plate 200 is installed on the cover plate 100 can be detected by visual inspection or a testing mechanism, ensuring that the explosion-proof valve protection plate 200 is installed and thus protecting the explosion-proof valve 300 from electrolyte corrosion.

[0044] Of course, in other embodiments, the marking color of the adhesive layer 220 can also be set to a bright color such as red, yellow, or green, to facilitate identification by the human eye or testing institutions. Alternatively, in some embodiments, the marking portion can also be a protrusion extending outward from the adhesive layer 220, with the protrusion having a marking color. Thus, whether the explosion-proof valve protection plate 200 has been installed on the cover plate 100 can be detected by the human eye or by a testing institution, avoiding omissions.

[0045] See also Figure 2 , Figure 3 and Figure 5 The adhesive layer 220 is annular and includes two straight segments 221 and two arc-shaped segments 222. The two straight segments 221 are along the second direction ( Figure 3 The two arc segments 222 are arranged opposite each other along the first direction (as shown in the Y-axis direction). The outer peripheral wall of the arc segment 222 that is away from the first injection hole 120 is provided with a second clearance edge 2221. The second clearance edge 2221 is flush with the first clearance edge 211 along the first direction. The second clearance edge 2221, the first clearance edge 211 and the inner wall of the mounting hole 110 together form a flow opening 2111.

[0046] Optionally, along the first direction, the distance between the first clearance edge 211, the second clearance edge 2221, and the inner peripheral wall of the arc-shaped segment 222 is b, and the value of b ranges from 0.1mm to 3.0mm. For example, the value of b can be 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, or 3.0mm, etc. By limiting the value of b to the above range, the contact area between the arc-shaped segment 222, which is away from the first injection hole 120, and the adhesive layer 220 is larger, thereby ensuring that the adhesive layer 220 can firmly fix the substrate 210 to the cover plate 100.

[0047] Further, see Figure 7 Along the first direction, the distance between the first clearance edge 211, the second clearance edge 2221, and the inner wall of the mounting hole 110 is denoted as e, and the value of e ranges from 0.1mm to 2.0mm. For example, the value of e can be 0.1mm, 0.2mm, 0.5mm, 1.0mm, 1.5mm, or 2.0mm, etc. By limiting the value of e to the above range, the flow area of ​​the flow port 2111 is made large enough to meet the helium detection requirements of the explosion-proof valve 300, ensuring high accuracy of the helium detection.

[0048] See Figure 2 , Figure 4 and Figure 6 Along the first direction, the distance between the outer peripheral wall of the arc segment 222 closest to the first injection hole 120 and the outer peripheral wall of the substrate 210 is denoted as 'a', and the value of 'a' ranges from 0 mm to 1.0 mm. For example, the value of 'a' can be 0 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, or 1.0 mm, etc. By limiting the value of 'a' to the above range, on the one hand, reliable connection between the adhesive layer 220 and the substrate 210 is ensured; on the other hand, the size of the substrate 210 is not too large, saving manufacturing materials and reducing costs.

[0049] Furthermore, along the first direction, the width of the bonding surface between the arc segment 222 closest to the first injection hole 120 and the cover plate 100 is c, and the value of c ranges from 0.5mm to 2.5mm. For example, the value of c can be 0.5mm, 1.0mm, 1.5mm, 2.0mm, or 2.5mm, etc. By limiting the value of c to the above range, the contact area between the arc segment 222 closest to the first injection hole 120 and the cover plate 100 is larger, thereby ensuring that the adhesive layer 220 can firmly fix the substrate 210 to the cover plate 100.

[0050] Along the second direction, the width of the bonding surface between the two straight segments 221 and the cover plate 100 is also c. This ensures that the contact area between the straight segments 221 and the cover plate 100 is large, thereby ensuring that the adhesive layer 220 can firmly fix the substrate 210 to the cover plate 100.

[0051] Optionally, along the first direction, the width of the arc segment 222 closest to the first injection hole 120 is t1, and the value of t1 ranges from 0.8mm to 3.0mm. For example, the value of t1 can be 0.8mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, or 3.0mm, etc. It should be noted that t1 > b ≥ c should be ensured. This ensures that the adhesive layer 220 reliably bonds the substrate 210 to the cover plate 100. The width of the straight segment 221 along the second direction is t2, where t1 = t2.

[0052] Furthermore, along the third direction ( Figure 4 In the Z-axis direction (as shown in the diagram), the thickness of the substrate 210 is h1, and the thickness of the adhesive layer 220 is h2. The value of h1 ranges from 0.1mm to 1.0mm. For example, the value of h1 can be 0.1mm, 0.2mm, 0.5mm, 0.8mm, or 1.0mm. By limiting the value of h1 within the above range, the mechanical strength of the substrate 210 is ensured to be high enough to reliably protect the explosion-proof valve 300. The value of h2 ranges from 0.02mm to 0.5mm. For example, the value of h2 can be 0.02mm, 0.03mm, or 0.05mm. This ensures that the amount of adhesive layer 220 is sufficient to firmly fix the substrate 210 to the cover plate 100, while the thickness of the adhesive layer 220 is not too large, resulting in waste of adhesive layer 220 material.

[0053] See also Figures 5-7 The cover plate 100 has a recessed platform 130 on its end face near the electrode assembly. The recessed platform 130 is located circumferentially to the mounting hole 110. The explosion-proof valve 300 includes a fixing part 310. The end face of the fixing part 310 facing away from the electrode assembly abuts against the bottom wall of the recessed platform 130. The circumferential side wall of the fixing part 310 is welded to the side wall of the recessed platform 130. The fixing part 310 fixes the explosion-proof valve 300 to the cover plate 100. Furthermore, the recessed platform 130 saves internal space in the battery, which is beneficial for increasing the arrangement space of the electrode assembly and improving the energy density of the battery. The explosion-proof valve 300 also includes a body part 320, and the fixing part 310 is arranged circumferentially around the body part 320. The main body 320 is provided with a scoring groove 321. The distance between the side of the scoring groove 321 near the fixing part 310 and the side wall of the platform 130 along the first direction is greater than the width of the fixing part 310, so that the scoring groove 321 can be exposed in the mounting hole 110, which facilitates the action of high temperature and high pressure gas on the scoring groove 321 and breaks through the scoring groove 321, thereby realizing the pressure relief function of the explosion-proof valve 300.

[0054] Furthermore, in this embodiment, a plastic part 400 is integrated on the cover plate 100, and the plastic part 400 is disposed on the side of the cover plate 100 near the electrode assembly. A second injection hole 420 is provided on the plastic part 400 corresponding to the position of the first injection hole 120 on the cover plate 100. The second injection hole 420 communicates with the first injection hole 120, allowing electrolyte to pass sequentially from the first injection hole 120 and the second injection hole 420 into the battery's receiving cavity, so that the electrolyte can submerge the electrode assembly. Several vent holes 410 are provided on the plastic part 400 corresponding to the position of the explosion-proof valve 300 on the cover plate 100. The vent holes 410 communicate the space on the side of the cover plate 100 near the electrode assembly with the explosion-proof valve 300, thereby allowing high-temperature, high-pressure gas to act on the explosion-proof valve 300 in the event of battery thermal runaway, causing it to open and release pressure.

[0055] Example 2

[0056] This embodiment provides a battery that differs from the battery in Embodiment 1 in that: in this embodiment, the mounting hole 110 and the first liquid injection hole 120 are located on one side wall of the housing, and the mounting structure of the explosion-proof valve protection plate 200 and the explosion-proof valve 300 on the housing is the same as in Embodiment 1. This avoids the explosion-proof valve protection plate 200 being missing, prevents electrolyte from flowing to the explosion-proof valve 300, and provides good protection for the explosion-proof valve 300. At the same time, it does not affect the airtightness test of the explosion-proof valve 300, and the helium test results are accurate.

[0057] The remaining structure of the battery in this embodiment is the same as that in Embodiment 1, and will not be described in detail here.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery, characterized in that, include: The outer shell has a hollow interior forming a receiving cavity. The outer shell is provided with a mounting hole and a first liquid injection hole, and the first liquid injection hole is located on one side of the mounting hole along a first direction. An explosion-proof valve protection plate is disposed on the side of the housing away from the receiving cavity. The explosion-proof valve protection plate includes a substrate and an adhesive layer. The adhesive layer is disposed on the side of the substrate close to the housing and connects the substrate to the housing. The adhesive layer has an identification portion. A first clearance edge is provided on the side of the substrate away from the first injection hole. A flow port is formed between the first clearance edge and the inner wall of the mounting hole. An explosion-proof valve is connected to the side of the housing away from the explosion-proof valve protection plate. When the explosion-proof valve is opened, it forms a pressure relief channel, which is sequentially connected to the mounting hole and the flow port.

2. The battery according to claim 1, characterized in that, The adhesive layer includes two straight segments and two arc segments. The two straight segments are arranged opposite each other along a second direction, and the two arc segments are arranged opposite each other along a first direction. The outer peripheral wall of the arc segment that is away from the first injection hole is provided with a second clearance edge. The second clearance edge, the first clearance edge, and the inner wall of the mounting hole together form the flow port.

3. The battery according to claim 2, characterized in that, Along the first direction, the distance between the first clearance edge, the second clearance edge and the inner peripheral wall of the arc segment is b; The value of b is in the range of 0.1mm ≤ b ≤ 3.0mm.

4. The battery according to claim 2, characterized in that, Along the first direction, the distance between the first clearance edge, the second clearance edge and the inner wall of the mounting hole is e; The value range of e is: 0.1mm≤e≤2.0mm.

5. The battery according to claim 2, characterized in that, Along the first direction, the distance between the outer peripheral wall of the arc segment closest to the first injection hole and the outer peripheral wall of the substrate is a; The range of values ​​for a is: 0mm≤a≤1.0mm.

6. The battery according to claim 2, characterized in that, Along the first direction, the width of the bonding surface between the arc segment closest to the first injection hole and the outer shell is c; The value range of c is: 0.5mm≤c≤2.5mm.

7. The battery according to claim 4, characterized in that, Along the first direction, the width of the arc segment closest to the first injection hole in the two arc segments is t1; The range of t1 is: 0.8mm ≤ t1 ≤ 3.0mm; And / or, along the second direction, the width of the straight segment is t2, t1 = t2.

8. The battery according to claim 1, characterized in that, Along the third direction, the thickness of the substrate is h1, and the thickness of the adhesive layer is h2; The value range of h1 is: 0.1mm ≤ h1 ≤ 1.0mm; The value range of h2 is: 0.02mm≤h2≤0.5mm.

9. The battery according to claim 1, characterized in that, The substrate is made of a transparent material, and the marking part is the marking color that the adhesive layer itself has.

10. The battery according to claim 1, characterized in that, The outer casing includes a cover plate and a housing. The cover plate is connected to the housing and forms the accommodating cavity. One side wall of the cover plate or the housing is provided with the mounting hole and the first injection hole.

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