Battery cover plate assembly, battery, and electric device

Abstract

An electric device. The electric device comprises a battery, the battery comprises a battery cover plate assembly, and the cover plate assembly comprises a cover plate and a cap. A cavity is defined between the cap and the cover plate, the cavity is configured to accommodate a tab and / or an electrode sheet of a battery cell, and the cap is provided with a scoring groove for preventing explosion.

Description

Battery cover assembly, battery and electrical equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application No. 202411011551.8, filed on July 26, 2024, with the China National Intellectual Property Administration and entitled “Battery Cover Assembly, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of electrical equipment technology, and in particular to a battery cover assembly, a battery, and an electrical device. Background Technology

[0004] In related technologies, the battery core includes a working reaction area (coating area) and a non-reactive working area (tab). The battery core is fixed inside the casing, and the tabs, spacers, etc. are all inside the casing.

[0005] However, existing battery cover assemblies have significant defects. Due to the limited installation location of the explosion-proof valve and the inability to meet the requirements of the battery generating a large amount of gas, the explosion-proof effect is poor, which affects the safety performance of the battery. Furthermore, if the rapidly generated high-temperature gas cannot be discharged in time, the battery is also at risk of explosion.

[0006] Public content

[0007] This disclosure aims to at least address one of the technical problems existing in the prior art. To this end, this disclosure proposes a battery cover assembly that can promptly eliminate the risk of explosion and reduce the risk of leakage caused by external stress impact or internal and external corrosion.

[0008] This disclosure further proposes a battery.

[0009] This disclosure also proposes an electrical device.

[0010] A cover assembly for a battery according to the present disclosure includes: a cover plate; and a cap, wherein a cavity is defined between the cap and the cover plate, the cavity being adapted to accommodate tabs and / or plates of a battery cell, and the cap having grooves for explosion protection.

[0011] For the cover plate assembly of the battery according to the present disclosure, by providing a scoring groove for explosion prevention on the cap, the space of the cavity formed between the cap and the cover plate is large enough. When gas is generated inside the battery and needs to be depressurized, the scoring groove cracks to exhaust gas, which can well guide the gas to be discharged from the inside of the battery, achieve rapid and smooth pressure relief, timely eliminate explosion hazards, and thus ensure the safety of the battery. Moreover, when the gas production is the same, the strength of the weak area can be increased, the bursting pressure at the scoring groove is increased, and the risk of liquid leakage caused by external stress impact or internal and external corrosion is reduced.

[0012] In some examples of the present disclosure, the cap is provided with a top plate and a plurality of side plates. The plurality of side plates are connected to the periphery of the top plate, and the top plate is located on the side of the plurality of side plates away from the cover plate, and the scoring groove is at least provided on one of the side plates.

[0013] In some examples of the present disclosure, the scoring groove is provided on at least two of the side plates, and the scoring grooves on at least two of the side plates are connected; and / or the scoring grooves on at least two of the side plates are not connected.

[0014] In some examples of the present disclosure, the thickness of the side plate is a. When the scoring grooves on at least two of the side plates are connected, the value range of a is: 0.4 mm < a < 5 mm; and / or when the scoring grooves on at least two of the side plates are not connected, the value range of a is: 0.05 mm < a < 0.8 mm.

[0015] In some examples of the present disclosure, the remaining thickness of the side plate after the scoring groove is provided is b, and the value range of b is: 0.02 mm ≤ b ≤ 0.7 mm.

[0016] In some examples of the present disclosure, the shape of the scoring groove is at least one of a straight line, a line segment, and a curve.

[0017] In some examples of the present disclosure, the cap is a metal structural member.

[0018] In some examples of the present disclosure, a through hole is further provided on the cover plate, and the tab and / or the electrode plate of the battery cell are adapted to pass through the through hole and extend into the cavity.

[0019] The battery according to the present disclosure includes: a battery cell provided with tabs; and the cover plate assembly of the battery as described above, and the tab and / or the electrode plate extend into the cavity.

[0020] The electrical device according to the present disclosure includes: the battery as described above.

[0021] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of a partial explosion of a battery according to an embodiment of the present disclosure;

[0024] Figure 2 is a cross-sectional schematic diagram of a battery according to an embodiment of the present disclosure;

[0025] Figure 3 is a partial schematic diagram of the continuous grooves on different side panels;

[0026] Figure 4 is a schematic diagram of different grooves on the side panel;

[0027] Figure 5 is a schematic block diagram of an electrical appliance according to an embodiment of the present disclosure.

[0028] Reference numerals: 1000, electrical equipment; 1, cover assembly; 10, cover; 101, perforation; 20, cap; 200, cavity; 201, side panel; 202, groove; 203, top plate; 2, battery; 40, cell; 400, tab; 401, electrode. Detailed Implementation

[0029] The embodiments of this disclosure are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0030] The cover assembly 1 according to an embodiment of the present disclosure is described below with reference to Figures 1-4. The cover assembly 1 is generally disposed on the housing of the battery 2.

[0031] As shown in Figures 1 and 2, the cover assembly 1 according to an embodiment of this disclosure includes a cover plate 10 and a cap 20. The cover plate 10 is the main body of the cover assembly 1, and it covers the casing of the battery 2, providing a certain degree of sealing and protection. The cap 20 is a component of the cover assembly 1, located on the surface of the cover plate 10 and forming a cavity 200, which ensures the stability and safety of the electrical equipment by protecting the safety of the battery 2. The height of the cap 20 is less than or equal to 50 mm, and the cross-section of the cap 20 can be rectangular, circular, or other shapes.

[0032] As shown in Figure 2, a cavity 200 is defined between the cap 20 and the cover plate 10. The cavity 200 is suitable for placing the tabs 400 and / or electrode plates 401 of the battery cell 40. Understandably, the cap 20 covers one side of the surface of the cover plate 10. At this time, the cap 20 and the cover plate 10 can define a cavity 200. The cavity 200 is suitable for placing the tabs 400 and / or electrode plates 401 of the battery cell 40. This allows the tabs 400 to be welded to one side outside the cover plate 10, reducing the redundant space between the battery cell 40 and the cover plate 10. It can also reduce the bending and accumulation of the tabs 400 inside the battery 2, which could lead to short circuits or low lifespan of the battery 2, and effectively improve the internal volumetric energy density and cycle life of the battery cell 40.

[0033] As shown in Figure 2, the cap 20 has a groove 202 for explosion protection. When the gas generated inside the battery 2 needs to be depressurized, the cap 20 will crack at the groove 202 because the structural strength at the groove 202 is relatively low, thus achieving the function of venting and depressurizing. The groove 202 is formed in a weak area of ​​different depths, strengths, and rigidities on another plane using laser or other physical or chemical methods, and the thickness of the weak area is less than the surrounding thickness.

[0034] It should be noted that when gas is generated inside battery 2, cavity 200 can act as a gas channel, allowing gas to enter and be stored within cavity 200. This effectively reduces the deformation of individual battery cells 2, preventing battery 2 from bulging and compressing other batteries 2 in the module. Furthermore, when the gas is concentrated within cavity 200 and the internal gas pressure reaches its upper limit, the groove 202 cracks to release gas, effectively guiding the gas out of the battery 2's interior. This achieves rapid and smooth pressure relief, promptly eliminating the risk of explosion and ensuring the safety of battery 2. Moreover, because the gas is concentrated within cavity 200, the cap 20 exhibits greater deformation strength for the same gas production, making detonation easier. This increases the strength of weak areas, and the increased burst pressure at groove 202 reduces the risk of leakage caused by external stress impacts or internal / external corrosion.

[0035] Therefore, by providing an explosion-proof groove 202 on the cap 20, the space of the cavity 200 formed between the cap 20 and the cover plate 10 is large enough. When the gas generated inside the battery 2 needs to be depressurized, the groove 202 cracks and vents, which can effectively guide the gas out of the battery 2, achieve rapid and smooth depressurization, eliminate the explosion hazard in time, and thus ensure the safety of the battery 2. Moreover, at the same gas production, the strength of the weak area can be improved, the burst pressure at the groove 202 increases, and the risk of leakage caused by external stress impact or internal and external corrosion is reduced.

[0036] Specifically, as shown in Figures 1 and 2, the cap 20 is provided with a top plate 203 and multiple side panels 201. The multiple side panels 201 are connected to the periphery of the top plate 203, and the top plate 203 is located on the side of the multiple side panels 201 away from the cap 10. A groove 202 is provided on at least one side panel 201. The top plate 203 and the multiple side panels 201 constitute the overall structure of the cap 20. The groove 202 being provided on at least one side panel 201 reduces the risk of leakage caused by external stress impact or internal / external corrosion. Furthermore, providing a groove 202 on the side panel 201 facilitates the use of the entire top surface of the cap 20 as an explosion-proof venting area when the internal pressure reaches its upper limit, resulting in a larger venting area. That is, the larger the explosion-proof area, the larger the cross-sectional area of ​​the venting channel when the explosion-proof area is opened, the smoother the venting, and the less likely the battery 2 is to explode. This avoids the problem that if the explosion-proof area is too small, venting may not be timely after opening, leading to the battery 2 still having the risk of explosion due to continuously rising internal pressure. The groove 202 can be provided on the outer or inner surface of the side panel 201.

[0037] It should be noted that no groove 202 is provided on the top surface of the cap 20, that is, on the top plate 203. This can reduce the risk of bumps and knocks along the length of the battery 2 during system assembly and enhance its resistance to external impact. Optionally, the depth of the groove 202 on different side panels 201 can be different. Grooves 202 of different depths can determine the bursting sequence of different side panels 201.

[0038] Of course, the groove 202 is located on the surface of the cap 20 away from the cover plate 10. When the groove 202 cracks and releases gas, it can prevent the ejected electrolyte, high-temperature substances, and sparks from damaging electronic components, thereby reducing safety hazards to electronic components. In addition, the explosion-proof structure with the groove 202 does not need to be welded to the cover plate 10. This saves on the preparation steps of the explosion-proof structure, and the process of welding the explosion-proof structure to the cover plate 10 achieves the advantages of reducing process difficulty and production costs.

[0039] Among them, as shown in FIGS. 3 and 4, notch grooves 202 are provided on at least two side panels 201, and the notch grooves 202 on at least two side panels 201 are connected, and / or the notch grooves 202 on at least two side panels 201 are not connected. The notch grooves 202 are provided on at least two side panels 201, which can reduce the risk of liquid leakage caused by external stress impact or internal and external corrosion, and can ensure that when the internal pressure of the battery 2 cover plate 10 reaches a preset value, the notch grooves 202 can burst, thereby improving the safety performance of the battery 2. The notch grooves 202 on at least two side panels 201 can be connected or not connected, and whether the notch grooves 202 on the two side panels 201 are connected depends on the thickness of the side panel 201. It should be noted that the notch grooves 202 are provided on more than one side panel 201, that is, the effect is the best when the notch grooves 202 are provided on all three side panels 201, and the side panel 201 near the pole column is not provided with the notch groove 202, otherwise the notch groove 202 is easily broken and the high-temperature gas is sprayed to the pole column, thus damaging the circuit system.

[0040] In addition, as shown in FIG. 2, the thickness of the side panel 201 is a. When the notch grooves 202 on at least two side panels 201 are connected, the value range of a is: 0.4 mm < a < 5 mm, and / or when the notch grooves 202 on at least two side panels 201 are not connected, the value range of a is: 0.05 mm < a < 0.8 mm.

[0041] It should be noted that there is a certain relationship between the thickness a of the side panel 201 and whether the notch grooves 202 on at least two side panels 201 are connected. Specifically, when the value of the thickness a of the side panel 201 is 0.4 mm - 5 mm, at this time, the thickness of the side panel 201 is too large, the strength of the corner area is too large, it is not easy to break, and the difficulty of forming an exhaust channel by opening the top surface of the cap 20 increases, and the notch grooves 202 cannot be opened in time, increasing the risk of explosion of the battery 2 due to excessive internal air pressure. Therefore, the effect is the best when the notch grooves 202 on at least two side panels 201 are connected. When the value of the thickness a of the side panel 201 is 0.05 mm - 0.8 mm, at this time, the side panel 201 is relatively thin and the strength is insufficient, and the corner area is extremely easy to break. In order to reduce liquid leakage caused by edge bumping or corrosion, the effect is the best when the notch grooves 202 on at least two side panels 201 are not connected.

[0042] Of course, as shown in Figure 2, the remaining thickness of the side panel 201 after the groove 202 is provided is b, and the value of b is in the range of 0.02mm ≤ b ≤ 0.7mm. It should be noted that the remaining thickness b is the thickness of the side panel 201 minus the thickness of the groove 202 after the groove 202 is provided on the side panel 201 of a certain thickness, and the remaining thickness b of the side panel 201 after the groove 202 is provided needs to meet a certain range. Specifically, the remaining thickness b of the side panel 201 after the groove 202 is provided cannot be too small, that is, less than 0.02mm. If the remaining thickness b of the side panel 201 after the groove 202 is provided is too small, the side panel 201 will be very easy to break, with insufficient strength, and will be easy to open prematurely, reducing the service life of the cover plate 10 and the battery 2. Meanwhile, the remaining thickness b of the side panel 201 after the groove 202 is provided cannot be too large, that is, greater than 0.7mm. If the remaining thickness b of the side panel 201 after the groove 202 is provided is too large, the side panel 201 will be too strong and not easy to break, making it more difficult for the groove 202 to open in time, thus increasing the risk of the battery 2 exploding due to excessive internal gas pressure. Therefore, by setting the remaining thickness b of the side panel 201 after the groove 202 is provided within the range of 0.02mm-0.7mm, it is possible to ensure that the groove 202 has sufficient strength, preventing the groove 202 from opening prematurely, and preventing the groove 202 from failing to open in time due to excessive strength, thereby ensuring that the groove 202 can effectively play its explosion-proof role in a timely manner. In addition, the opening pressure range at the groove 202 is 0.15Mpa-3Mpa, and the height of the cap 20 is less than or equal to 50mm.

[0043] Furthermore, as shown in Figure 4, the groove 202 is shaped as at least one of a straight line, a line segment, and a curve. The groove 202 can reduce the risk of leakage caused by external stress impact or internal and external corrosion. By shaped as at least one of a straight line, a line segment, and a curve, the structure of the groove 202 can better conform to actual working conditions, thereby improving the safety of the battery 2.

[0044] In addition, as shown in Figure 1, the cap 20 is a metal structural component. By making the cap 20 a metal structural component, it can prevent the battery 2 from overcharging and protect the battery 2 in the event of an external short circuit, ensuring the safety performance of the battery 2. At the same time, the metal structural component can achieve lower internal resistance, making the structure of the cap 20 more suitable for actual working conditions.

[0045] It should be noted that, as shown in Figure 1, the cover plate 10 also has a through hole 101. The tabs 400 and / or plates 401 of the cell 40 are adapted to pass through the through hole 101 and extend into the cavity 200. A cap 20 is provided on the surface of the cover plate 10, and the cavity 200 is defined between the cap 20 and the cover plate 10. The through hole 101 is provided on the cover plate 10, and the tabs 400 and / or plates 401 of the cell 40 pass through the through hole 101 and extend into the cavity 200. In this way, the tabs 400 are welded to the outside of the cover plate 10 of the battery 2, which can reduce the bending and accumulation of the tabs 400 inside the battery 2, which may cause short circuits or low life of the battery 2. This effectively improves the energy density and cycle life of the internal volume of the cell 40. In addition, it can increase the free space between the cover plate 10 and the cell 40, thereby reducing the side bulging of the battery 2 and enhancing the upper limit of the withstand voltage.

[0046] Furthermore, as shown in Figures 1 and 2, the battery 2 according to the embodiments of this disclosure includes a cell 40, which is provided with tabs 400 and the cover assembly 1 of the battery 2 in the above embodiments. The tabs 400 and / or electrode plates 401 extend into the cavity 200. The cell 40 is the core component inside the battery 2 and can store electrical energy. The tabs 400 can perform functions such as connection, conduction, and sealing. The tabs 400 and / or electrode plates 401 extend into the cavity 200. In this way, the tabs 400 are welded to the outside of the cover plate 10 of the battery 2, which can reduce the bending and accumulation of the tabs 400 inside the battery 2, which may cause short circuits or low life of the battery 2. This effectively improves the volumetric energy density and cycle life inside the cell 40. In addition, it can increase the free space between the cover plate 10 and the cell 40, thereby reducing the side bulging of the battery 2 and enhancing the upper limit of the withstand voltage.

[0047] The electrical device 1000 according to an embodiment of this disclosure includes the battery 2 of the above embodiment, as shown in FIG5.

[0048] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 disclosure and 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 disclosure.

[0049] In the description of this disclosure, "first feature" and "second feature" may include one or more of the features. In the description of this disclosure, "a plurality of" means two or more. In the description of this disclosure, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. In the description of this disclosure, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0051] Although embodiments of this disclosure have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (1) of a battery (2), characterized in that The application relates to a battery cover plate assembly (1) comprising: a cover plate (10); and a cover cap (20) defining a cavity (200) with the cover plate (10), the cavity (200) being adapted to place a tab (400) and / or a pole piece (401) of an electric core (40), the cover cap (20) being provided with a score groove (202) for explosion prevention. The cover cap (20) is provided with a top plate (203) and a plurality of side plates (201), the plurality of side plates (201) being connected to the circumferential side of the top plate (203), and the top plate (203) being located on the side of the plurality of side plates (201) away from the cover plate (10), and the score groove (202) is arranged on at least one of the side plates (201).

2. The cover plate assembly (1) of a battery (2) according to claim 1, characterized in that At least two of the side plates (201) are provided with the score groove (202), and the score grooves (202) on the at least two side plates (201) are connected; and / or 3. The cover plate assembly (1) of a battery (2) according to claim 2, characterized in that The score grooves (202) on the at least two side plates (201) are not connected. The thickness of the side plate (201) is a, when the score grooves (202) on the at least two side plates (201) are connected, the value range of the a is 0.4mm < a < 5mm; and / or 4. The cover plate assembly (1) of a battery (2) according to claim 3, characterized in that When the score grooves (202) on the at least two side plates (201) are not connected, the value range of the a is 0.05mm < a < 0.8mm. The remaining thickness of the side plate (201) after the score groove (202) is arranged is b, and the value range of the b is 0.02mm <= b <= 0.7mm.

5. The cover plate assembly (1) of a battery (2) according to any one of claims 2-4, characterized in that The score groove (202) is at least one of a straight line, a line segment and a curve in shape.

6. The cover plate assembly (1) of a battery (2) according to any one of claims 1-5, characterized in that The cover cap (20) is a metal structural part.

7. The cover plate assembly (1) of a battery (2) according to any one of claims 1-6, characterized in that The cover plate (10) is further provided with a through hole (101), and the tab (400) and / or the pole piece (401) of the electric core (40) is adapted to pass through the through hole (101) and extend into the cavity (200).

8. The cover plate assembly (1) of a battery (2) according to any one of claims 1-7, characterized in that The application relates to a battery cover plate assembly (1) comprising:

9. A battery (2) characterized in that, an electric core (40) provided with a tab (400); and The application relates to a battery (2) according to any one of claims 1-8, wherein the tab (400) and / or the pole piece (401) extends into the cavity (200). The application relates to a battery (2) according to claim 9. ​ 10. An electric device (1000) characterized in that, ​ ​

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