Cover plate assembly and battery

Abstract

The utility model belongs to the technical field of battery structures, and discloses a cover plate assembly and a battery. The cover plate assembly comprises a battery cover plate, an elastic membrane and a sealing plug, when the elastic membrane deforms under the action of large internal pressure of the battery, a secondary pressure relief hole can be separated from the sealing plug to form a pressure relief gap, so that the internal pressure of the battery is reduced, and when the internal pressure of the battery is reduced, the secondary pressure relief hole can be separated from the sealing plug to form a pressure relief gap. The second-stage pressure relief hole can abut against the sealing plug in a sealed mode. According to the cover plate assembly, a pressure relief gap can be formed between the secondary pressure relief hole and the sealing plug when the internal pressure of the battery is too large, so that the pressure relief and explosion prevention effects are achieved, and after the internal pressure of the battery is reduced to a normal range, the elastic membrane is reset, so that the secondary pressure relief hole moves and is in a sealing state with the sealing plug, and the battery is prevented from being damaged. Therefore, the effect of preventing leakage is achieved, and external air or moisture is prevented from entering the battery in the pressure relief and sealing processes, so that the battery can still be normally used after multiple times of pressure relief.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a cover plate assembly and a battery. Background Art

[0002] The explosion-proof valve structure of the cover plate is an important safety device for the battery, mainly to prevent short circuits or side reactions inside the battery and generate a large amount of gas and heat. After accumulation, the battery may explode, affecting the safety of other batteries or vehicles. Currently, the explosion-proof valve structure of lithium batteries used in the market mainly consists of a metal film, the outside of the cover plate, and a PET transparent protective film, with a bursting pressure of about 0.8 Mpa. When the pressure inside the battery rises due to reasons such as a short circuit, the explosion-proof valve ruptures to relieve the pressure and prevent a more serious explosion from affecting safety.

[0003] In the prior art, the explosion-proof valve structure is a disposable product. Once it ruptures when the pressure inside the battery exceeds the bursting pressure, air or moisture will enter the battery, causing the battery to malfunction and can only be scrapped.

[0004] Based on the above, there is an urgent need for a cover plate assembly and a battery to solve the above technical problems. Summary of the Utility Model

[0005] An object of the utility model is to provide a cover plate assembly that can relieve pressure when the pressure inside the battery is large, prevent explosion, and can be sealed again to ensure the normal use of the battery.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The cover plate assembly includes:

[0008] A battery cover plate provided with a primary pressure relief hole;

[0009] An elastic diaphragm, the edge portion of which is circumferentially connected to the battery cover plate to seal the primary pressure relief hole. A secondary pressure relief hole is provided on the elastic diaphragm, and the secondary pressure relief hole communicates with the primary pressure relief hole;

[0010] A sealing plug fixedly connected to the battery cover plate. The sealing plug is configured such that when the elastic diaphragm deforms in the direction of the primary pressure relief hole, the inner wall of the secondary pressure relief hole can be separated from the sealing plug to form a pressure relief gap, and when the elastic diaphragm returns to its original position, the inner wall of the secondary pressure relief hole is in sealing contact with the sealing plug to seal the secondary pressure relief hole.

[0011] Preferably, the elastic diaphragm is connected to one end of the first-level pressure relief hole close to the bottom surface of the battery cover, and, along the direction from the top surface to the bottom surface of the battery cover, the opening size of the second-level pressure relief hole is reduced and the cross-sectional size of the sealing plug is increased.

[0012] Preferably, the secondary pressure relief hole has a tapered inner wall, and the sealing plug has a tapered outer wall, and the tapered inner wall and the tapered outer wall can be in limited contact when the internal pressure of the battery is not greater than a first preset value; or,

[0013] The secondary pressure relief hole has a stepped inner wall, and the sealing plug has a stepped outer wall. The stepped inner wall and the stepped outer wall can be in limited contact when the internal pressure of the battery is not greater than a first preset value.

[0014] Preferably, the cover plate assembly also includes a mounting rod, one end of which is fixedly connected to the sealing plug; the battery cover plate also includes a mounting portion, which is connected to the side wall of the first-level pressure relief hole, and the other end of the mounting rod is fixedly connected to the mounting portion.

[0015] Preferably, the central portion of the elastic diaphragm is provided with a tubular portion, the tubular portion has a central hole which is arranged through, the axial direction of the central hole is parallel to the thickness direction of the battery cover plate, the end of the central hole away from the battery cover plate is configured as the secondary pressure relief hole, the sealing plug and the mounting rod are arranged through the central hole, and the mounting rod is arranged coaxially with the central hole.

[0016] The cover plate assembly further includes a guide member, which is disposed in contact between the inner wall of the central hole and the mounting rod to guide the moving direction of the tubular portion.

[0017] Preferably, the cover plate assembly also includes an elastic member, which is used to drive the tubular portion to move in a direction close to the sealing plug so that the secondary pressure relief hole and the sealing plug form a sealing abutment or strengthen the sealing abutment between the secondary pressure relief hole and the sealing plug.

[0018] Preferably, the elastic member includes a spring, which is sleeved on the mounting rod, and the outer peripheral surface of the mounting rod is protrudingly provided with an abutment member, an abutment surface is formed at the end of the tubular portion away from the battery cover, and the spring is compressed and arranged between the abutment member and the abutment surface.

[0019] Advantages of the present utility model: Through this cover plate assembly, by utilizing the elastic deformation ability of the elastic diaphragm, when the internal pressure of the battery is too high, the secondary pressure relief hole can move and form a pressure relief gap with the sealing plug, thereby achieving the effect of pressure relief and explosion prevention. After the internal pressure of the battery is relieved and reduced to the normal range, by utilizing the elastic recovery ability of the elastic diaphragm, the secondary pressure relief hole moves and is in a sealed state with the sealing plug, thereby achieving the effect of preventing leakage. That is to say, this cover plate assembly can repeatedly achieve the effects of pressure relief and sealing, and both during the pressure relief and sealing processes, it avoids the entry of external air or moisture into the battery interior, thereby ensuring the normal components inside the battery, enabling the battery to still be used normally after multiple pressure reliefs, reducing the scrapping phenomenon of the battery, and lowering the usage cost of the battery.

[0020] An object of the present utility model is to provide a battery that can relieve pressure when the internal pressure of the battery is relatively high, prevent explosion, and can be reused.

[0021] To achieve this purpose, the present utility model adopts the following technical solutions:

[0022] The battery includes a battery housing and the above-mentioned cover plate assembly. One end of the battery housing is open and the cover plate assembly is sealedly arranged thereon. When the elastic diaphragm of the cover plate assembly deforms under the action of the internal pressure of the battery greater than the first preset value, the inner wall of the secondary pressure relief hole of the cover plate assembly can be separated from the sealing plug of the cover plate assembly to form a pressure relief gap, and the pressure relief gap is used to reduce the internal pressure of the battery. And when the internal pressure of the battery is not greater than the first preset value, the inner wall of the secondary pressure relief hole is in sealed contact with the sealing plug to maintain the internal pressure of the battery.

[0023] Preferably, the elastic diaphragm of the cover plate assembly is provided with a notch to form a weak part, and the weak part is configured to rupture when the internal pressure of the battery is greater than the second preset value, and the second preset value is greater than the first preset value.

[0024] Preferably, the cover plate assembly further includes a protective film. The protective film covers the primary pressure relief hole of the cover plate assembly and is located on the top surface of the battery cover of the cover plate assembly. The protective film is provided with a third opening, and the third opening can communicate with the pressure relief gap to reduce the internal pressure of the battery.

[0025] Advantages of the present utility model: By providing the above-mentioned cover plate assembly, using the elastic deformation ability of the elastic diaphragm, when the pressure inside the battery is too high, the secondary pressure relief hole can move to form a pressure relief gap with the sealing plug, thereby achieving the effect of pressure relief and explosion prevention. After the pressure inside the battery is relieved and reduced to the normal range, using the elastic recovery ability of the elastic diaphragm, the secondary pressure relief hole moves to be in a sealed state with the sealing plug, thereby achieving the effect of preventing leakage. That is to say, the cover plate assembly can repeatedly achieve the effects of pressure relief and sealing, and both during pressure relief and sealing, it avoids the entry of external air or moisture into the battery interior, thereby ensuring the normal components inside the battery, enabling the battery to be reused after multiple pressure reliefs, reducing the battery scrapping phenomenon, and lowering the battery usage cost. Description of the Drawings

[0026] Figure 1 is the top view of the cover plate assembly provided by the present utility model;

[0027] Figure 2 is Figure 1 the partial enlarged view of A in

[0028] Figure 3 is along Figure 2 the internal sectional view when the internal pressure of the battery in the B-B direction in

[0029] Figure 4 is Figure 3 the partial enlarged view of C in

[0030] Figure 5 is along Figure 2 the internal sectional view when the internal pressure of the battery in the B-B direction in

[0031] Figure 6 is Figure 5 the partial enlarged view of D in

[0032] Figure 7 is the front view of the cover plate assembly provided by the present utility model;

[0033] Figure 8 is along Figure 7 the internal sectional view of the cover plate assembly in the E-E direction in

[0034] Figure 9 is Figure 8 the partial enlarged view of G in

[0035] Figure 10 is along Figure 7 the internal sectional view of the cover plate assembly in the F-F direction.

[0036] In the figure: 1. Battery cover plate; 11. Primary pressure relief hole; 12. Mounting part;

[0037] 2. Elastic diaphragm; 20. Pressure relief gap; 21. Secondary pressure relief hole; 22. Tubular part; 221. Contact surface; 23. Raised part; 24. Weak part;

[0038] 3. Sealing plug;

[0039] 4. Mounting rod;

[0040] 5. Contact member;

[0041] 6. Elastic member;

[0042] 7. Protective film; 71. Third opening;

[0043] 8. Guide member. Detailed implementation mode

[0044] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0045] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", "fixed", "abutted" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0046] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", "left", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations, 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 thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for differentiation in description and have no special meaning.

[0048] Next, according to the attached Figure 1 to the attached Figure 10 introduce the cover plate assembly and the battery provided by the present utility model.

[0049] Specifically, as Figures 1 to 4 shown, in this embodiment, the cover plate assembly includes a battery cover plate 1, an elastic diaphragm 2, and a sealing plug 3. Among them, the battery cover plate 1 is used to install structural components such as battery pole columns (not shown in the figure), and can be hermetically arranged with the battery housing to protect the battery core. The elastic diaphragm 2 and the sealing plug 3 are installed on the battery cover plate 1, and can play a role in pressure relief control when the internal pressure of the battery is too high, thereby preventing the battery from exploding.

[0050] As Figures 3 to 5 shown, the battery cover plate 1 is provided with a primary pressure relief hole 11, and the primary pressure relief hole 11 penetrates through the battery cover plate 1 along the thickness direction of the battery cover plate 1, and can allow gas to flow out when the internal pressure of the battery is greater than the first preset value, thereby reducing the internal pressure of the battery. The edge portion of the elastic diaphragm 2 is circumferentially connected to the battery cover plate 1 to seal the primary pressure relief hole 11, so as to prevent the gas or electrolyte inside the battery from flowing out through the gap between the elastic diaphragm 2 and the battery cover plate 1 when the internal pressure of the battery is normal (that is, not greater than the above first preset value), resulting in a leakage phenomenon. The central portion of the elastic diaphragm 2 is provided with a secondary pressure relief hole 21, and the secondary pressure relief hole 21 is communicated with the primary pressure relief hole 11. When the internal pressure of the battery is greater than the first preset value, the gas can flow out through the primary pressure relief hole 11 and the secondary pressure relief hole 21. The sealing plug 3 is fixedly connected to the battery cover plate 1 and penetrates through the secondary pressure relief hole 21, and the sealing plug 3 can seal or open the secondary pressure relief hole 21 to meet the needs of preventing leakage and pressure relief and explosion protection under different internal pressures of the battery.

[0051] Exemplarily, as Figure 3 、 Figure 4 shown, when the battery is in a normal condition, that is, when the internal pressure of the battery is not greater than the first preset value, the elastic diaphragm 2 does not deform or deforms slightly. The sealing plug 3 penetrates through the secondary pressure relief hole 21, and the outer wall of the sealing plug 3 is in sealing contact with the inner wall of the secondary pressure relief hole 21, thereby ensuring the isolation between both sides of the battery cover plate 1, avoiding the leakage of the gas or electrolyte inside the battery, and also avoiding the entry of the outside air or moisture into the battery. Refer to Figure 5, Figure 6 As shown, when the internal pressure of the battery is greater than the first preset value, the battery has an explosion risk. At this time, under the action of the internal pressure of the battery, the elastic diaphragm 2 deforms in the direction of the position of the first pressure relief hole 11, and the relative position between the second pressure relief hole 21 and the sealing plug 3 changes, so that a separation is formed between the outer wall of the sealing plug 3 and the inner wall of the second pressure relief hole 21 to form a pressure relief gap 20. Through this pressure relief gap 20 and the first pressure relief hole 11, the gas inside the battery can flow out of the battery interior, thereby reducing the internal pressure of the battery and achieving the effect of pressure relief and explosion prevention. It can be understood that since the internal pressure of the battery is greater than the outside at this time, the outside air or moisture cannot enter the battery interior through the pressure relief gap 20 during the pressure relief process.

[0052] Of course, when the internal pressure of the battery decreases from a state greater than the first preset value to equal to or less than the first preset value, due to the elastic recovery ability of the elastic diaphragm 2 itself, the elastic diaphragm 2 will reset, and the relative position between the second pressure relief hole 21 and the sealing plug 3 will change again, and the outer wall of the sealing plug 3 and the inner wall of the second pressure relief hole 21 will return to the state of sealing contact, eliminating the above-mentioned pressure relief gap 20, sealing the second pressure relief hole 21 again, isolating both sides of the battery cover 1, and re - achieving the effect of preventing leakage.

[0053] Through this cover assembly, by utilizing the elastic deformation ability of the elastic diaphragm 2, when the internal pressure of the battery is too high, a pressure relief gap 20 can be formed by the movement of the second pressure relief hole 21 and the sealing plug 3, thereby achieving the effect of pressure relief and explosion prevention. After the internal pressure of the battery is relieved and reduced to the normal range, by utilizing the elastic recovery ability of the elastic diaphragm 2, the second pressure relief hole 21 moves and is in a sealed state with the sealing plug 3, thereby achieving the effect of preventing leakage. That is to say, this cover assembly can repeatedly achieve the effects of pressure relief and sealing, and both during the pressure relief and sealing processes, it avoids the entry of outside air or moisture into the battery interior, thereby ensuring the normal components inside the battery, enabling the battery to still be used normally after multiple pressure relieves, reducing the scrapping phenomenon of the battery, and lowering the usage cost of the battery.

[0054] Preferably, in this embodiment, the elastic diaphragm 2 is connected to one end of the first pressure relief hole 11 close to the bottom surface of the battery cover 1 (i.e., the side of the battery cover 1 close to the battery cell). And, along the direction from the top surface to the bottom surface of the battery cover 1, the opening size of the second pressure relief hole 21 is set to decrease, and the cross - sectional size of the sealing plug 3 is set to increase, so as to form a limiting contact between the elastic diaphragm 2 and the sealing plug 3, and this limiting contact is beneficial to improving the sealing performance between the sealing plug 3 and the second pressure relief hole 21.

[0055] Furthermore, as Figure 2As shown, the cover plate assembly further includes a protective film sheet 7. The protective film sheet 7 covers the first-stage pressure relief hole 11 and is located on the top surface of the battery cover plate 1. It can be made of materials such as transparent PET to play a good protective role. The protective film sheet 7 is provided with a third opening 71. The third opening 71 can communicate with the pressure relief gap 20 to reduce the internal pressure of the battery, so as to achieve the effect of reducing the internal pressure of the battery when the pressure relief gap 20 is formed.

[0056] Exemplarily, as Figure 3 , Figure 4 shown, the second-stage pressure relief hole 21 has a conical inner wall, and the sealing plug 3 has a conical outer wall. When the internal pressure of the battery is not greater than the first preset value, the conical inner wall and the conical outer wall can be limited and abutted. In some embodiments, due to the elasticity of the elastic membrane 2 itself, the second-stage pressure relief hole 21 has a tendency to move relative to the sealing plug 3 in the Figure 4 direction from top to bottom. At this time, by providing the conical inner wall and the conical outer wall to play a limiting role, the second-stage pressure relief hole 21 can be pressed against the sealing plug 3, so as to achieve the effect of sealed abutment.

[0057] Of course, in some other embodiments, in addition to the conical shape, a stepped shape can also be used to achieve the effect of limiting and abutting. Exemplarily, the second-stage pressure relief hole 21 has a stepped inner wall, and the sealing plug 3 has a stepped outer wall. When the internal pressure of the battery is not greater than the first preset value, due to the elasticity of the elastic membrane 2 itself and the limiting abutment between the stepped inner wall and the stepped outer wall, the second-stage pressure relief hole 21 can also be pressed against the sealing plug 3, so as to achieve the effect of sealed abutment. It should be noted that compared with the stepped shape, the conical shape can better play the role of guiding the movement direction, so that the sealing effect is more reliable and stable.

[0058] As Figures 4 to 6 shown, the cover plate assembly further includes a mounting rod 4. The mounting rod 4 is used to fixedly connect the sealing plug 3 and the battery cover plate 1 to prevent the sealing plug 3 from not being able to abut against the inner wall of the second-stage pressure relief hole 21 to achieve the sealing effect. Specifically, the battery cover plate 1 further includes a mounting portion 12. The mounting portion 12 is connected to the side wall of the first-stage pressure relief hole 11. One end of the mounting rod 4 is fixedly connected to the sealing plug 3, and the other end of the mounting rod 4 is fixedly connected to the mounting portion 12, so as to fix the sealing plug 3.

[0059] Preferably, a heightening portion 23 is provided at the edge portion of the elastic diaphragm 2 to form a space for accommodating the mounting rod 4 between the elastic diaphragm 2 and the battery cover plate 1 without reducing the thickness of the mounting portion 12. This not only ensures the structural strength of the mounting portion 12 but also avoids complicating the processing technology of the battery cover plate 1 and facilitates the setting of the mounting rod 4. Specifically, the heightening portion 23 can be integrally formed on the elastic diaphragm 2, or can be independently mounted on the elastic diaphragm 2, or even can be integrally formed on the battery cover plate 1. As long as it can connect the primary pressure relief hole 11 and the elastic diaphragm 2, it falls within the scope of protection of the present utility model.

[0060] Optionally, in some other embodiments, the cover plate assembly further includes structures such as a lower plastic part, and the mounting rod 4 can also be fixedly connected between the lower plastic part and the sealing plug 3 to fix the sealing plug 3, which also falls within the scope of protection of the present utility model.

[0061] More specifically, as Figure 6 shown, a tubular portion 22 is provided at the central portion of the elastic diaphragm 2. The tubular portion 22 has a central hole that is penetratingly provided, and the axial direction of the central hole is parallel to the thickness direction of the battery cover plate 1. One end of the central hole far from the battery cover plate 1 is configured as a secondary pressure relief hole 21. The sealing plug 3 and the mounting rod 4 pass through the central hole, and the mounting rod 4 is coaxially arranged with the central hole. Similar to the above-mentioned heightening portion 23, the tubular portion 22 can also be integrally formed on the elastic diaphragm 2 or can be independently mounted on the elastic diaphragm 2, and these all fall within the scope of protection of the present utility model.

[0062] Furthermore, as Figure 4 、 Figure 6 shown, the cover plate assembly further includes an elastic member 6. The elastic member 6 is used to drive the tubular portion 22 to move in a direction close to the sealing plug 3 so that the secondary pressure relief hole 21 and the sealing plug 3 are in sealing contact with each other or to strengthen the sealing between the secondary pressure relief hole 21 and the sealing plug 3.

[0063] Specifically, in this embodiment, the elastic member 6 includes a spring. The spring is sleeved on the mounting rod 4, and a contact member 5 is prominently provided on the outer peripheral surface of the mounting rod 4. One end of the tubular portion 22 away from the battery cover plate 1 is provided in a contracted shape, thereby forming a contact surface 221, and this contact surface 221 is used to contact one end of the spring. The other end of the spring contacts the above-mentioned contact member 5, so that the spring is arranged in a compressed state between the contact member 5 and the contact surface 221. Furthermore, the elastic force of the spring is utilized to enable the tubular portion 22 to have a running tendency to press against the sealing plug 3, thereby realizing the sealed connection between the secondary pressure relief hole 21 and the sealing plug 3, or strengthening the sealing performance between the secondary pressure relief hole 21 and the sealing plug 3 on the basis of the elastic diaphragm 2. Optionally, in this embodiment, the cover assembly further includes a positioning pin, and the positioning pin can be fixedly inserted into the mounting rod 4 along the radial direction of the mounting rod 4 to form the above-mentioned contact member 5.

[0064] Certainly, in some other embodiments, structures such as bellows and elastic sheets can also be used as the elastic member 6. The present invention does not make specific limitations in this regard, as long as it can achieve the sealed connection between the secondary pressure relief hole 21 and the sealing plug 3, or strengthen the sealing performance between the secondary pressure relief hole 21 and the sealing plug 3 on the basis of the elastic diaphragm 2.

[0065] It should be noted that in the attached Figure 3 figures Figure 6 shown in the present invention, the top surface direction of the battery cover plate 1 is shown above in the attached drawings, and the bottom surface direction of the battery cover plate 1 is shown below in the attached drawings. However, this display method does not constitute a limitation on the position setting of structures such as the elastic diaphragm 2. In some embodiments, the elastic diaphragm 2 and the sealing plug 3 can be arranged on the bottom side of the battery cover plate 1. In some other embodiments, the elastic diaphragm 2 and the sealing plug 3 can be arranged on the top side of the battery cover plate 1. In still some other embodiments, the elastic diaphragm 2 and the sealing plug 3 can also be arranged inside the primary pressure relief hole 11 of the battery cover plate 1. The present invention does not make specific limitations in this regard.

[0066] Such as Figure 7 、 Figure 8As shown, in this embodiment, the elastic diaphragm 2 is provided with a notch to form a weak part 24. The weak part 24 can rupture when the internal pressure of the battery is greater than a second preset value (the second preset value is greater than the first preset value), so as to quickly form a pressure relief opening, and the area of this pressure relief opening is larger than the above-mentioned pressure relief gap 20. It should be noted that when the internal pressure of the battery exceeds the first preset value and rises above the second preset value, it indicates that a large amount of gas is rapidly generated inside the battery, with a relatively high explosion risk. At this time, by the rupture of the elastic diaphragm 2, a pressure relief opening with a larger area can be formed, so as to quickly release the gas to the outside of the battery, achieving the effect of reducing the explosion intensity and explosion risk of the battery. Preferably, by forming the weak part 24, the bursting pressure of the elastic diaphragm 2 is about 0.8 Mpa.

[0067] Of course, in some other embodiments, according to different bursting pressures or first preset values, the thickness of the elastic diaphragm 2 and the depth of the notch can also be adaptively changed. The present invention does not make specific limitations in this regard, as long as the effect of multiple seals can be achieved.

[0068] Furthermore, as Figures 8 to 9 shown, the cover plate assembly further includes a guide member 8. The guide member 8 is abutted and arranged between the inner wall of the central hole and the outer wall of the mounting rod 4 to guide the moving direction of the tubular part 22, so that the tubular part 22 can move smoothly along the thickness direction of the battery cover plate 1, avoiding the deviation between the sealing plug 3 and the secondary pressure relief hole 21 and resulting in local gaps when the internal pressure of the battery is not greater than the first preset value, thereby ensuring the sealing performance between the sealing plug 3 and the secondary pressure relief hole 21. Of course, a pressure relief channel is reserved between the guide member 8 and the inner wall of the central hole or between the guide member 8 and the outer wall of the mounting rod 4. When the pressure relief gap 20 is formed, the gas can flow from the inside of the battery to the outside of the battery through the pressure relief channel, the pressure relief gap 20 and the third opening 71 in sequence, so as to reduce the internal pressure of the battery.

[0069] Preferably, as Figure 10 shown, in this embodiment, the above-mentioned mounting part 12 extends from one inner wall of the primary pressure relief hole 11 to the opposite inner wall, which is beneficial to improving the structural strength of the battery cover plate 1 and preventing the battery cover plate 1 from deforming during processing and transportation. It should be noted that the mounting part 12 can either be integrally formed on the battery cover plate 1 or be installed on the battery cover plate 1 with an independent part to form the mounting part 12. The present invention does not make specific limitations in this regard.

[0070] The present utility model further provides a battery, which includes a battery housing and the above-mentioned cover plate assembly. One end of the battery housing is open and the cover plate assembly is sealed thereon. When the internal pressure of the battery is greater than a first preset value, the deformation of the elastic diaphragm 2 enables the tubular portion 22 to move towards the position of the primary pressure relief hole 11, so that the inner wall of the secondary pressure relief hole 21 is separated from the sealing plug 3, thereby forming a pressure relief gap 20. The gas inside the battery can flow out of the battery through the pressure relief gap 20 and the first pressure relief hole 11, thereby reducing the internal pressure of the battery. Moreover, when the internal pressure of the battery is less than the first preset value, the sealing abutment between the secondary pressure relief hole 21 and the sealing plug 3 is maintained, thus maintaining the internal pressure of the battery. That is to say, the cover plate assembly can repeatedly achieve the effects of pressure relief and sealing, and both during the pressure relief and sealing processes, the entry of external air or moisture into the battery is avoided, thereby ensuring the normal components inside the battery, enabling the battery to still be used normally after multiple pressure reliefs, reducing the scrapping phenomenon of the battery, and lowering the usage cost of the battery.

[0071] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Cover plate assembly, characterized in that, Comprising: A battery cover plate (1), the battery cover plate (1) being provided with a primary pressure relief hole (11); An elastic diaphragm (2), an edge portion of the elastic diaphragm (2) being circumferentially connected to the battery cover plate (1) to seal the primary pressure relief hole (11), a secondary pressure relief hole (21) being provided on the elastic diaphragm (2), the secondary pressure relief hole (21) communicating with the primary pressure relief hole (11); A sealing plug (3), the sealing plug (3) being fixedly connected to the battery cover plate (1), the sealing plug (3) being configured such that when the elastic diaphragm (2) deforms in the direction of the position of the primary pressure relief hole (11), an inner wall of the secondary pressure relief hole (21) can be separated from the sealing plug (3) to form a pressure relief gap (20), and when the elastic diaphragm (2) resets, the inner wall of the secondary pressure relief hole (21) is in sealing abutment with the sealing plug (3) to seal the secondary pressure relief hole (21).

2. The cover plate assembly according to claim 1, wherein the elastic diaphragm (2) is connected to an end of the primary pressure relief hole (11) close to the bottom surface of the battery cover plate (1), and, along the direction from the top surface to the bottom surface of the battery cover plate (1), an opening size of the secondary pressure relief hole (21) is set to decrease, and a cross-sectional size of the sealing plug (3) is set to increase.

3. The cover plate assembly according to claim 2, wherein the secondary pressure relief hole (21) has a tapered inner wall, and the sealing plug (3) has a tapered outer wall, the tapered inner wall and the tapered outer wall being capable of limiting abutment when the internal pressure of the battery is not greater than a first preset value; or, the secondary pressure relief hole (21) has a stepped inner wall, and the sealing plug (3) has a stepped outer wall, the stepped inner wall and the stepped outer wall being capable of limiting abutment when the internal pressure of the battery is not greater than a first preset value.

4. The cover plate assembly according to claim 2, wherein the cover plate assembly further includes a mounting rod (4), one end of the mounting rod (4) being fixedly connected to the sealing plug (3); the battery cover plate (1) further includes a mounting portion (12), the mounting portion (12) being connected to a side wall of the primary pressure relief hole (11), the other end of the mounting rod (4) being fixedly connected to the mounting portion (12).

5. The cover plate assembly according to claim 4, wherein a tubular portion (22) is provided in a central portion of the elastic diaphragm (2), the tubular portion (22) having a central hole that is penetratingly provided, an axial direction of the central hole being parallel to a thickness direction of the battery cover plate (1), an end of the central hole remote from the battery cover plate (1) being configured as the secondary pressure relief hole (21), the sealing plug (3) and the mounting rod (4) passing through the central hole, and the mounting rod (4) being coaxially arranged with the central hole, the cover plate assembly further includes a guiding member (8), the guiding member (8) being abutted and arranged between an inner wall of the central hole and the mounting rod (4) to guide a moving direction of the tubular portion (22).

6. The cover plate assembly according to claim 5, wherein the cover plate assembly further includes an elastic member (6), and the elastic member (6) is configured to drive the tubular portion (22) to move in a direction close to the sealing plug (3), so that the secondary pressure relief hole (21) forms a sealing abutment with the sealing plug (3) or strengthens the sealing abutment between the secondary pressure relief hole (21) and the sealing plug (3).

7. The cover plate assembly according to claim 6, wherein the elastic member (6) includes a spring, the spring is sleeved on the mounting rod (4), an abutting member (5) is prominently provided on the outer peripheral surface of the mounting rod (4), an abutting surface (221) is formed at one end of the tubular portion (22) away from the battery cover plate (1), and the spring is disposed in a compressed state between the abutting member (5) and the abutting surface (221).

8. A battery, characterized in that, A battery housing and the cover plate assembly according to any one of claims 1-7, one end of the battery housing is open and the cover plate assembly is sealingly provided thereon. When the elastic diaphragm (2) of the cover plate assembly deforms under the action of a battery internal pressure greater than a first preset value, the inner wall of the secondary pressure relief hole (21) of the cover plate assembly can be separated from the sealing plug (3) of the cover plate assembly to form a pressure relief gap (20), and the pressure relief gap (20) is used to reduce the battery internal pressure. And when the battery internal pressure is not greater than the first preset value, the inner wall of the secondary pressure relief hole (21) is in sealing abutment with the sealing plug (3) to maintain the battery internal pressure.

9. The battery according to claim 8, wherein the elastic diaphragm (2) of the cover plate assembly is provided with a notch to form a weak portion (24), and the weak portion (24) is configured to rupture when the battery internal pressure is greater than a second preset value, and the second preset value is greater than the first preset value.

10. The battery according to claim 8, wherein the cover plate assembly further includes a protective film (7), the protective film (7) covers the primary pressure relief hole (11) of the cover plate assembly and is located on the top surface of the battery cover plate (1) of the cover plate assembly, the protective film (7) is provided with a third opening (71), and the third opening (71) can communicate with the pressure relief gap (20) to reduce the battery internal pressure.

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