Cover plate assembly of battery, battery and electric equipment

Abstract

The invention discloses a cover plate assembly of a battery, the battery and electric equipment. The cover plate assembly comprises a cover plate and a cover plate, a cavity is defined between the cover cap and the cover plate, the cavity is suitable for placing a tab and / or a pole piece of a battery cell, and the cover cap is provided with an anti-explosion nick groove. The anti-explosion indentation groove is formed in the cover cap, the space of the cavity formed between the cover cap and the cover plate is large enough, when gas is generated in the battery and needs to be relieved, the indentation groove cracks to exhaust gas, the gas is well guided to be exhausted from the interior of the battery, rapid and smooth pressure relief is achieved, hidden danger of explosion is eliminated in time, and then the safety of the battery is guaranteed; and under the same gas production rate, the strength of the weak area can be improved, the bursting pressure at the nick groove is increased, and the liquid leakage risk caused by external stress impact or internal and external corrosion is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to a battery cover assembly, a battery and an electrical equipment. Background Art

[0002] In the related art, the battery core includes a battery working reaction area (dressing area) and a conductive area (pole ear) of a non-reaction working area. The battery core is fixed in a shell, and the pole ears, spacers, etc. are all inside the shell.

[0003] However, the existing battery cover assembly also has significant defects: due to the limited installation position of the explosion-proof valve and the inability to meet the large amount of gas generated by the battery, the explosion-proof effect will be poor, thereby affecting the safety performance of the battery. If the rapidly generated high-temperature gas cannot be removed in time, the battery will be at risk of explosion. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery cover assembly, which can eliminate the explosion hazard in time and reduce the risk of leakage caused by external stress impact or internal and external corrosion.

[0005] The present invention further provides a battery.

[0006] The present invention further provides an electrical device.

[0007] The cover plate assembly of the battery according to the present invention comprises: a cover plate; a cover cap, wherein a cavity is defined between the cover cap and the cover plate, the cavity is suitable for accommodating the pole lugs and / or pole pieces of the battery cell, and the cover cap is provided with a notched groove for explosion prevention.

[0008] According to the cover plate assembly of the battery of the present invention, a notched groove for explosion-proof is provided on the cover cap, and the space of the cavity formed between the cover cap and the cover plate is large enough. When gas is generated inside the battery and needs to be depressurized, the notched groove is cracked to exhaust gas, which well guides the gas to be discharged from the inside of the battery, thereby achieving rapid and smooth pressure relief, timely eliminating the explosion hazard, and thus ensuring the safety of the battery. Moreover, at the same gas production volume, the strength of the weak area can be improved, the bursting pressure at the notched groove is increased, and the risk of leakage due to external stress impact or internal and external corrosion is reduced.

[0009] In some examples of the present invention, the cap is provided with a top plate and multiple side panels, the multiple side panels are connected to the peripheral side of the top plate, and the top plate is located on the side of the multiple side panels away from the cover plate, and the notched groove is provided on at least one of the side panels.

[0010] In some examples of the present invention, the scoring grooves are provided on at least two of the side panels, and the scoring grooves on at least two of the side panels are connected; and / or the scoring grooves on at least two of the side panels are not connected.

[0011] In some examples of the present invention, the thickness of the side panel is a. When the scoring grooves on at least two of the side panels 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 panels are not connected, the value range of a is: 0.05 mm < a < 0.4 mm.

[0012] In some examples of the present invention, the remaining thickness b of the side panel after the scoring groove is provided, and the value range of b is: 0.02 mm ≤ b ≤ 0.7 mm.

[0013] In some examples of the present invention, the shape of the scoring groove is configured as at least one of a straight line, a line segment, and a curve.

[0014] In some examples of the present invention, the cap is a metal structural member.

[0015] In some examples of the present invention, a perforation 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 perforation and extend into the cavity.

[0016] The battery according to the present invention includes: a battery cell provided with tabs; the cover plate assembly of the battery described above, and the tabs and / or the electrode plates extend into the cavity.

[0017] The electrical device according to the present invention includes: the battery described above.

[0018] Some of the additional aspects and advantages of the present invention will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0020] Figure 1 is a partial explosion schematic diagram of the battery according to the embodiment of the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of the battery according to the embodiment of the present invention;

[0022] Figure 3 is a partial schematic diagram of continuous scoring grooves of different side panels;

[0023] Figure 4 is a schematic diagram of different scoring grooves of the side panel.

[0024] Reference numerals:

[0025] 1. Cover plate assembly;

[0026] 10. Cover plate; 101. Perforation; 20. Cover cap; 200. Cavity; 201. Side panel; 202. Notch groove; 203. Top plate; 2. Battery; 40. Battery cell; 400. Tab. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0028] Reference below Figure 1-Figure 4 The cap plate assembly 1 according to an embodiment of the present invention is described. The cap plate assembly 1 is generally disposed on a housing of a battery 2 .

[0029] like Figure 1 and Figure 2 As shown, the cover plate assembly 1 according to an embodiment of the present invention includes: a cover plate 10 and a cap 20. The cover plate 10 is the main part of the cover plate assembly 1. The cover plate 10 is covered on the shell of the battery 2 and can play a certain role in sealing and protection. The cap 20 is a component of the cover plate assembly 1, and is located on the surface of the cover plate 10 to form a cavity 200, which can ensure the stability and safety of the electrical equipment by protecting the safety of the battery 2. Among them, 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, etc.

[0030] like Figure 2 As shown, a cavity 200 is defined between the cap 20 and the cover plate 10, and the cavity 200 is suitable for placing the tab 400 and / or the pole piece of the battery cell 40. It can be understood that the cap 20 is covered on the surface of one side of the cover plate 10, and at this time, a cavity 200 can be defined between the cap 20 and the cover plate 10, and the cavity 200 is suitable for placing the tab 400 and / or the pole piece of the battery cell 40, so that the tab 400 can be welded and transferred to the outer cavity side of the cover plate 10, reducing the redundant space between the battery cell 40 and the cover plate 10, and can reduce the bending and accumulation of the tab 400 inside the battery 2 into the shell, resulting in a short circuit or a low life of the battery 2, and effectively improve the internal volume energy density and cycle life of the battery cell 40.

[0031] like Figure 2 As shown, the cap 20 is provided with a notch groove 202 for explosion prevention. When gas is generated inside the battery 2 and pressure relief is required, the cap 20 will crack at the notch groove 202 due to the low structural strength of the cap 20, thereby achieving the function of exhaust and pressure relief. The notch groove 202 is a weak area with different depth, strength and rigidity formed on other planes by laser or other physical or chemical methods, and the thickness of the weak area is less than the surrounding thickness.

[0032] It should be noted that when gas is generated inside the battery 2, the cavity 200 can serve as an airway, and the gas can be passed into and stored in the cavity 200, which can effectively reduce the deformation of the battery 2 monomer, prevent the battery 2 from swelling and squeezing other batteries 2 in the module, and the gas is more concentrated in the cavity 200. When the internal gas pressure reaches the upper limit, the notched groove 202 cracks to exhaust gas, which well guides the gas to be discharged from the inside of the battery 2, achieving rapid and smooth pressure discharge, timely eliminating the explosion hazard, and thus ensuring the safety of the battery 2. Moreover, because the cavity 200 space concentrates the gas, the deformation strength of the cap 20 is greater at the same gas production, so it is easier to detonate, which can improve the strength of the weak area, increase the blasting pressure at the notched groove 202, and reduce the risk of leakage caused by external stress impact or internal and external corrosion.

[0033] Therefore, by providing the cap 20 with an explosion-proof notch groove 202, the space of the cavity 200 formed between the cap 20 and the cover plate 10 is large enough. When gas is generated inside the battery 2 and pressure relief is required, the notch groove 202 is split to exhaust gas, which well guides the gas to be discharged from the inside of the battery 2, thereby achieving rapid and smooth pressure relief, timely eliminating the explosion hazard, and thus ensuring the safety of the battery 2. Moreover, when the gas production is the same, the strength of the weak area can be improved, the bursting pressure at the notch groove 202 is increased, and the risk of leakage caused by external stress impact or internal and external corrosion is reduced.

[0034] Specifically, Figure 1 and Figure 2 As shown, the cap 20 is provided with a top plate 203 and a plurality of side panels 201, the plurality of side panels 201 are connected to the peripheral side of the top plate 203, and the top plate 203 is located on the side of the plurality of side panels 201 away from the cover plate 10, and the notched groove 202 is provided on at least one side panel 201. The top plate 203 and the plurality of side panels 201 constitute the overall structure of the cap 20, and the notched groove 202 is provided on at least one side panel 201, so that the risk of leakage caused by external stress impact or internal and external corrosion can be reduced. In addition, the notched groove 202 is provided on the side panel 201, which is conducive to the entire top surface of the cap 20 as an explosion-proof area for exhaust when the internal pressure reaches the upper limit, and the exhaust area is larger. The larger the area of ​​the explosion-proof area, the larger the cross-sectional area of ​​the exhaust channel when the explosion-proof area is opened, the smoother the exhaust, and the less likely the battery 2 is to explode, so as to avoid the problem of too small an area of ​​the explosion-proof area, and the problem of untimely exhaust after opening, thereby causing the battery 2 to still have the risk of explosion due to the continuous increase of internal air pressure. The notched groove 202 may be disposed on the outer surface or the inner surface of the side panel 201 .

[0035] It should be noted that no notch 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 liquid leakage caused by bumping of the battery 2 in the length direction during system assembly, enhance the impact resistance against external forces. Optionally, the depths of the notch grooves 202 on different side plates 201 can be different, and the different depths of the notch grooves 202 can determine the explosion sequence of different side plates 201.

[0036] Certainly, the notch groove 202 is provided on the surface of the cap 20 on the side away from the cover plate 10. When the notch groove 202 cracks and exhausts gas, it can prevent the ejected electrolyte, high-temperature substances, and sparks from damaging electronic components, thereby reducing the safety hazards of electronic components. In addition, the explosion-proof structure with the notch groove 202 does not need to be welded to the cover plate 10, which can save the preparation steps of the explosion-proof structure and the process of welding the explosion-proof structure to the cover plate 10, achieving the advantages of reducing the process difficulty and production cost.

[0037] Among them, as Figure 3 and Figure 4 shown, at least two side plates 201 are provided with notch grooves 202, the notch grooves 202 on at least two side plates 201 are connected, and / or the notch grooves 202 on at least two side plates 201 are not connected. At least two side plates 201 are provided with notch grooves 202, 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 plates 201 can be connected or not connected, and whether the notch grooves 202 on the two side plates 201 are connected depends on the thickness of the side plates 201. It should be noted that the notch groove 202 is provided on more than one side plate 201, and the effect is best when three side plates 201 are provided with notch grooves 202. The side plate 201 close to the pole is not provided with a notch groove 202, otherwise the high-temperature gas ejected when the notch groove 202 breaks is likely to spray to the pole and damage the circuit system.

[0038] In addition, as Figure 2 shown, the thickness of the side plate 201 is a. When the notch grooves 202 on at least two side plates 201 are connected, the value range of a is: 0.4mm < a < 5mm, and / or when the notch grooves 202 on at least two side plates 201 are not connected, the value range of a is: 0.05mm < a < 0.8mm.

[0039] It should be noted that there is a certain relationship between the thickness a of the side panel 201 and whether the notched grooves 202 on at least two side panels 201 are connected or not. Specifically, when the thickness a of the side panel 201 is 0.4mm-5mm, the thickness of the side panel 201 is too large, the strength of the corner area is too large, and it is not easy to break. It is more difficult to open the top surface of the cap 20 to form an exhaust channel, and the notched grooves 202 cannot be opened in time, which increases the risk of explosion of the battery 2 due to excessive internal air pressure. Therefore, the best effect is achieved when the notched grooves 202 on at least two side panels 201 are connected. When the thickness a of the side panel 201 is 0.05mm-0.8mm, the side panel 201 is thin, the strength is insufficient, and the corner area is very easy to break. In order to reduce leakage caused by edge bumps or corrosion, the best effect is achieved when the notched grooves 202 on at least two side panels 201 are not connected.

[0040] Of course, if Figure 2 As shown, the remaining thickness of the side panel 201 after the notch groove 202 is provided is b, and the value range of b is: 0.02mm≤b≤0.7mm. It should be noted that the remaining thickness is the thickness of the side panel 201 minus the thickness of the notch groove 202 after the notch groove 202 is provided on the side panel 201 of a certain thickness. The remaining thickness b of the side panel 201 after the notch groove 202 is provided needs to meet a certain range. Specifically, the remaining thickness b of the side panel 201 after the notch groove 202 is provided cannot be too small, that is, less than 0.02mm. In this way, the remaining thickness b of the side panel 201 after the notch groove 202 is provided is too small, the side panel 201 is very easy to break, the strength is insufficient, and it is easy to open prematurely, which reduces the service life of the cover plate 10 and the battery 2. At the same time, the remaining thickness b of the side panel 201 after the notch groove 202 is provided cannot be too large, that is, greater than 0.7mm. This The residual thickness b of the side panel 201 after the notch groove 202 is set is too large. At this time, the residual thickness b of the side panel 201 after the notch groove 202 is set is too large, the side panel 201 is too strong and not easy to break, the difficulty of the notch groove 202 to explode increases, the notch groove 202 cannot be opened in time, and the risk of the battery 2 exploding due to excessive internal air pressure is increased. Therefore, by setting the residual thickness b of the side panel 201 after the notch groove 202 is set in the range of 0.02mm-0.7mm, it can ensure that the notch groove 202 has sufficient strength to avoid the notch groove 202 from opening in advance, and avoid the notch groove 202 from not being able to open in time due to excessive strength, thereby ensuring that the notch groove 202 can play an explosion-proof role in a timely and effective manner. In addition, the opening pressure at the notch groove 202 is in the range of: 0.15Mpa-3Mpa, and the height of the cap 20 is less than or equal to 50mm.

[0041] Furthermore, if Figure 4As shown, the shape of the notched groove 202 is at least one of a straight line, a line segment, and a curve. The notched groove 202 can reduce the risk of leakage caused by external stress impact or internal and external corrosion. The shape of the notched groove 202 is at least one of a straight line, a line segment, and a curve, so that the structure of the notched groove 202 is more in line with actual working conditions, thereby improving the safety of the battery 2.

[0042] In addition, Figure 1 As shown, the cap 20 is a metal structural part. When the cap 20 is set as a metal structural part, the cap 20 can prevent the battery 2 from being overcharged, can protect the battery 2 in the case of an external short circuit, can ensure the safety performance of the battery 2, and at the same time, the metal structural part can achieve a lower internal resistance, so that the structure of the cap 20 is more in line with actual working conditions.

[0043] It should be noted that if Figure 1 As shown, the cover plate 10 is also provided with a through hole 101, and the tabs 400 and / or the pole pieces of the battery cell 40 are suitable for being penetrated by the through hole 101 and extending into the cavity 200. The cap 20 is arranged 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 the pole pieces of the battery cell 40 are penetrated by the through hole 101 and extended into the cavity 200. In this way, the tabs 400 are welded outside the cover plate 10 of the battery 2, which can reduce the bending and accumulation of the tabs 400 inside the battery 2 when entering the shell, resulting in short circuit or low life of the battery 2, and effectively improve the internal volume energy density and cycle life of the battery cell 40. In addition, the free space between the cover plate 10 and the battery cell 40 can be increased, thereby reducing the bulging of the side of the battery 2 and enhancing the upper limit of the withstand voltage.

[0044] In addition, if Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, the battery 2 comprises: a battery cell 40, the battery cell 40 is provided with a pole ear 400, and the cover plate assembly 1 of the battery 2 described in the above embodiment, the pole ear 400 and / or the pole piece extend into the cavity 200. The battery cell 40 is a core component inside the battery 2, which can store electrical energy, and the pole ear 400 can play the role of connection, conduction, sealing, etc. The pole ear 400 and / or the pole piece extend into the cavity 200, so that the pole ear 400 is welded outside the cover plate 10 of the battery 2, which can reduce the bending and accumulation of the pole ear 400 inside the battery 2 into the shell, resulting in a short circuit or a low life of the battery 2, and effectively improve the internal volume energy density and cycle life of the battery cell 40. In addition, the free space from the cover plate 10 to the battery cell 40 can be increased, thereby reducing the bulging of the side of the battery 2 and enhancing the upper limit of the withstand voltage.

[0045] The electrical equipment according to the embodiment of the present invention comprises: the battery 2 described in the above embodiment.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In the description of the present invention, "plurality" means two or more. In the description of the present invention, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. In the description of the present invention, a first feature "above", "above" and "above" a second feature may include the first feature being directly above and obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly (1) of a battery (2), characterized in that: Comprising: Cover plate (10); Cap (20), a cavity (200) is defined between the cap (20) and the cover plate (10), and the cavity (200) is adapted to place the tab (400) and / or the electrode tab of the battery cell (40). A scoring groove (202) for explosion prevention is provided on the cap (20).

2. The cover plate assembly (1) of the battery (2) according to claim 1, characterized in that: The cap (20) is provided with a top plate (203) and a plurality of side plates (201). The plurality of side plates (201) are connected to the peripheral side of the top plate (203), and the top plate (203) is located on the side of the plurality of side plates (201) away from the cover plate (10). The scoring groove (202) is provided on at least one of the side plates (201).

3. The cover plate assembly (1) of the battery (2) according to claim 2, characterized in that: The scoring grooves (202) are provided on at least two of the side plates (201), and the scoring grooves (202) on at least two of the side plates (201) are connected; and / or The scoring grooves (202) on at least two of the side plates (201) are not connected.

4. The cover plate assembly (1) of the battery (2) according to claim 3, characterized in that: The thickness of the side plate (201) is a. When the scoring grooves (202) on at least two of the side plates (201) are connected, the value range of a is: 0.4 mm < a < 5 mm; and / or When the scoring grooves (202) on at least two of the side plates (201) are not connected, the value range of a is: 0.05 mm < a < 0.8 mm.

5. The cover plate assembly (1) of a battery (2) according to any one of claims 2 to 4, characterized in that: The remaining thickness of the side plate (201) after the scoring groove (202) is provided is b, and the value range of b is: 0.02 mm ≤ b ≤ 0.7 mm.

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

7. The cover plate assembly (1) of the battery (2) according to claim 1, characterized in that: The cap (20) is a metal structural member.

8. The cover plate assembly (1) of the battery (2) according to claim 1, characterized in that: A through hole (101) is further formed on the cover plate (10), and the tab (400) and / or the electrode tab of the battery cell (40) are adapted to pass through the through hole (101) and extend into the cavity (200).

9. A battery (2), characterized in that: Comprising: Battery cell (40), the battery cell (40) is provided with a tab (400); The cover plate assembly (1) of the battery (2) according to any one of claims 1-8, the tab (400) and / or the electrode tab extend into the cavity (200).

10. An electrical device, characterized in that: Comprising: The battery (2) according to claim 9.

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