Battery cover plate assembly, battery and power device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cover plate assembly, a battery and a power device. The battery cover plate assembly comprises a cover plate, an insulating part and at least one baffle plate, an anti-explosion valve is arranged on the cover plate; the insulating part is arranged on the inner surface of the cover plate, and an exhaust cavity is formed between the insulating part and the cover plate and corresponds to the anti-explosion valve; the baffles are arranged in the exhaust cavity and divide the exhaust cavity into a plurality of separated cavities. According to the battery cover plate assembly provided by the utility model, the baffle plates are arranged in the exhaust cavity, and the exhaust cavity is divided into the plurality of separation cavities by the baffle plates, so that the electrolyte is dispersed into the plurality of separation cavities when the electrolyte is gathered, and the electrolyte can be dispersed into the plurality of separation cavities when the battery pack is vibrated and the electrolyte shakes back and forth in the exhaust cavity; the anti-explosion valve can weaken the impact force of electrolyte on the anti-explosion valve, prevent the electrolyte from shaking and impacting the anti-explosion valve, avoid cracking and liquid leakage of the anti-explosion valve, and play a role in protecting the anti-explosion valve, thereby improving the safety performance of the battery and the whole vehicle.

Description

Technical Field

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

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0003] An exhaust cavity is arranged at a position on the cover plate opposite to the explosion-proof valve, allowing the gas in the battery case to pass through.

[0004] Currently, for safety reasons in the industry, when the battery modules are grouped, the battery is inverted so that the opening direction of the explosion-proof valve faces the bottom of the vehicle, reducing the harm caused by battery thermal runaway. When the battery is inverted, the electrolyte in the battery will gather in the exhaust cavity; when the battery pack is vibrated, the electrolyte will slosh back and forth in the exhaust cavity, constantly impacting the explosion-proof valve, causing damage to the explosion-proof valve, resulting in electrolyte leakage from the battery cell and premature opening of the explosion-proof valve, thus affecting the safety performance of the whole vehicle. Summary of the Utility Model

[0005] In view of this, the utility model provides a battery cover plate assembly, a battery and a power device to solve the problem that the electrolyte gathers in the exhaust cavity and is easy to impact the explosion-proof valve, affecting the safety performance of the battery and the whole vehicle.

[0006] In a first aspect, the utility model provides a battery cover plate assembly, including a cover plate, an insulating member and at least one baffle. An explosion-proof valve is arranged on the cover plate; the insulating member is arranged on the inner surface of the cover plate, and an exhaust cavity is arranged between the insulating member and the cover plate at a position corresponding to the explosion-proof valve; the baffle is arranged in the exhaust cavity, dividing the exhaust cavity into a plurality of partition chambers.

[0007] Beneficial effects: When the battery formed by assembling the battery cover plate assembly on the housing is inverted, the electrolyte will gather in the exhaust cavity. By arranging a baffle in the exhaust cavity, the exhaust cavity is divided into a plurality of partition chambers by the baffle. Thus, when the electrolyte gathers, it will be dispersed into a plurality of partition chambers. Therefore, when the battery pack is vibrated and the electrolyte sloshes back and forth in the exhaust cavity, the impact force of the electrolyte on the explosion-proof valve can be weakened, blocking the electrolyte from sloshing and impacting the explosion-proof valve, avoiding cracking and leakage of the explosion-proof valve, playing a protective role for the explosion-proof valve, and thus improving the safety performance of the battery and the whole vehicle.

[0008] In an optional embodiment, a groove is arranged at a position on the insulating member corresponding to the explosion-proof valve, and the cavity between the groove and the cover plate forms the exhaust cavity.

[0009] In an optional embodiment, one side edge of the baffle is connected to the bottom wall of the groove, and the other side edge of the baffle extends towards the cover plate.

[0010] In an alternative embodiment, there is an included angle α between the baffle and the bottom wall of the groove, satisfying: 45° ≤ α ≤ 80°.

[0011] In an alternative embodiment, the thickness of the baffle is b, satisfying: 0.5 mm ≤ b ≤ 0.7 mm.

[0012] In an alternative embodiment, the thickness of the insulating member at the bottom wall of the groove is c, satisfying: 1 mm ≤ c ≤ 1.5 mm.

[0013] In an alternative embodiment, it also satisfies: 0.35 ≤ b / c ≤ 0.65.

[0014] In an alternative embodiment, a plurality of baffles are provided and arranged at intervals along the length direction of the exhaust cavity.

[0015] In a second aspect, the present utility model further provides a battery, including a housing, an electrode assembly, and the battery cover assembly according to any one of the above technical solutions. The housing has a receiving cavity and an open end; the electrode assembly is disposed in the receiving cavity of the housing; the battery cover assembly is disposed at the open end of the housing to encapsulate the electrode assembly in the housing, and the exhaust cavity communicates with the receiving cavity of the housing.

[0016] Beneficial effects: Since the battery includes the battery cover assembly, it has the same effects as the battery cover assembly, which will not be elaborated here.

[0017] In a third aspect, the present utility model further provides a power device, including the battery according to the above technical solutions.

[0018] Beneficial effects: Since the power device includes the battery, it has the same effects as the battery, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural view of the inner side view of a battery cover assembly according to an embodiment of the present utility model;

[0021] Figure 2 For Figure 1 the top view of the battery cover assembly shown;

[0022] Figure 3 For alongFigure 2 Cross-sectional view taken along line A-A;

[0023] Figure 4 is an exploded view of a battery including Figure 1 the battery cover assembly shown;

[0024] Figure 5 is Figure 4 the top view of;

[0025] Figure 6 is a cross-sectional view taken along line B-B in Figure 5 ;

[0026] Figure 7 is Figure 6 the enlarged partial view at C in;

[0027] Explanation of reference numerals:

[0028] 1. Battery cover assembly; 11. Cover; 12. Explosion-proof valve; 13. Insulating part; 131. Groove; 14. Exhaust cavity; 15. Baffle; 16. Terminal post; 17. Liquid injection hole; 2. Housing; 3. Electrode group; 4. Connecting piece; 5. Blue film; 6. Electrolyte. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] For the square battery in the related art, it includes a battery cover assembly 1, a housing 2, an electrode group 3, a connecting piece 4, and a blue film 5. The housing 2 is provided with a receiving cavity, and the electrode group 3 is disposed in the receiving cavity of the housing 2. The battery cover assembly 1 is assembled at the open end of the housing 2 to encapsulate the electrode group 3 in the housing 2. The battery cover assembly 1 is integrated with an explosion-proof valve 12, upper plastic, lower plastic, a terminal post 16, and a liquid injection hole 17. The terminal post 16 of the battery cover assembly 1 is electrically connected to the electrode group 3 inside the housing 2 through the connecting piece 4. The blue film 5 is coated outside the housing 2.

[0031] The battery cover assembly 1 and the housing 2 are fixedly connected by laser welding, and a sealed space with a certain mechanical strength for protecting the electrode group 3 is formed between the battery cover assembly 1 and the housing 2. The lower plastic in the battery cover assembly 1 presses the separator of the electrode group 3, so that the electrode group 3 is well fixed in the housing 2, avoiding internal short circuit caused by the shaking of the electrode group 3.

[0032] On the opposite side of the explosion-proof valve 12 on the battery cover assembly 1, an exhaust cavity 14 is required to facilitate the passage of gas, so that when a large amount of gas is generated inside the battery housing 2, it can reach the explosion-proof valve 12 to achieve valve opening and pressure relief, ensuring the safety performance of the battery.

[0033] However, for safety reasons in the current automotive industry, when modularizing and grouping, the square battery is inverted, so that the valve opening direction of the explosion-proof valve 12 faces the bottom of the vehicle, reducing the harm caused by battery thermal runaway. However, when the square battery is inverted, the electrolyte 6 in the battery will gather in the exhaust cavity 14. When the battery pack is vibrated, the electrolyte 6 will slosh back and forth in the exhaust cavity 14, constantly impacting the explosion-proof valve 12, causing damage to the explosion-proof valve 12, resulting in electrolyte leakage from the battery cell and premature valve opening of the explosion-proof valve 12, thus affecting the safety performance of the battery and the vehicle.

[0034] The following combines Figures 1 to 7 to describe the embodiments of the present invention.

[0035] According to an embodiment of the present invention, on the one hand, a battery cover assembly 1 is provided, including a cover plate 11, an insulating member 13, and at least one baffle 15. An explosion-proof valve 12 is provided on the cover plate 11; the insulating member 13 is disposed on the inner surface of the cover plate 11, and an exhaust cavity 14 is provided between the insulating member 13 and the cover plate 11 at a position corresponding to the explosion-proof valve 12; the baffle 15 is disposed in the exhaust cavity 14, dividing the exhaust cavity 14 into a plurality of partition chambers.

[0036] For the battery cover assembly 1 provided by the embodiment of the present invention, since the exhaust cavity 14 is provided between the cover plate 11 and the insulating member 13, and the exhaust cavity 14 faces the explosion-proof valve 12, it is convenient to exhaust and relieve pressure in time when gas is generated inside the battery. When the battery formed by assembling the battery cover assembly 1 on the housing 2 is inverted, the electrolyte 6 will gather in the exhaust cavity 14. By providing the baffle 15 in the exhaust cavity 14, the exhaust cavity 14 is divided into a plurality of partition chambers by the baffle 15. Thus, when the electrolyte 6 gathers, it will be dispersed into a plurality of partition chambers. Therefore, when the battery pack is vibrated and causes the electrolyte 6 to slosh back and forth in the exhaust cavity 14, the impact force of the electrolyte 6 on the explosion-proof valve 12 can be weakened, blocking the sloshing of the electrolyte 6 from impacting the explosion-proof valve 12, avoiding cracking and leakage of the explosion-proof valve 12, playing a protective role for the explosion-proof valve 12, and thus improving the safety performance of the battery and the vehicle.

[0037] Specifically, the inner surface of the cover plate 11 means that in the state of the battery formed by assembling the battery cover assembly 1 on the battery housing 2, the side surface of the cover plate 11 facing the electrode group 3 in the housing 2 is the inner surface.

[0038] In some embodiments, a groove 131 is provided at a position of the insulating member 13 corresponding to the explosion-proof valve 12, and the cavity between the groove 131 and the cover plate 11 forms the exhaust cavity 14.

[0039] Specifically, in some embodiments, the insulating member 13 includes a lower plastic.

[0040] By providing a groove 131 at a position corresponding to the explosion-proof valve 12 on the insulating member 13, a cavity can be formed at the groove 131 after the insulating member 13 and the cover plate 11 are assembled. This cavity constitutes the exhaust cavity 14, and the exhaust cavity 14 faces the explosion-proof valve 12. Forming the exhaust cavity 14 by providing the groove 131 has a simple structure and is convenient for processing.

[0041] In some embodiments, as Figure 1 shown, along the width direction of the insulating member 13, the groove 131 penetrates both sides of the insulating member 13.

[0042] In some embodiments, one side edge of the baffle 15 is connected to the bottom wall of the groove 131, and the other side edge of the baffle 15 extends toward the cover plate 11.

[0043] Specifically, referring to Figure 2 and Figure 3 , in this embodiment, the baffle 15 is connected to the insulating member 13.

[0044] Of course, as an alternative embodiment, the baffle 15 can also be connected to the inner surface of the cover plate 11 and extend toward the insulating member 13.

[0045] The respective partition chambers communicate with each other.

[0046] In some embodiments, there is an included angle α between the baffle 15 and the bottom wall of the groove 131, satisfying: 45° ≤ α ≤ 80°.

[0047] Specifically, referring to Figure 3 , since there is an included angle α between the baffle 15 and the bottom wall of the groove 131, that is, the baffle 15 is inclined with respect to the bottom wall of the groove 131. The baffle 15 arranged in this way can block the impact of the electrolyte 6 sloshing on the explosion-proof valve 12, avoiding cracking and leakage of the explosion-proof valve 12, thereby improving the safety performance of the battery and the whole vehicle. By controlling the included angle α between the baffle 15 and the bottom wall of the groove 131 within the range of 45° to 80°, it can not only ensure that the baffle 15 weakens the sloshing impact of the electrolyte 6, but also ensure that the baffle 15 does not affect exhaust, and ensure that the explosion-proof valve 12 can open the valve and relieve pressure normally.

[0048] In some embodiments, the thickness of the baffle 15 is b, satisfying: 0.5 mm ≤ b ≤ 0.7 mm.

[0049] By controlling the thickness b of the baffle 15 within the range of 0.5 mm to 0.7 mm, it is possible to ensure that the baffle 15 has a certain mechanical strength, can block the impact brought by the sloshing electrolyte 6, is easy to process, and can also control the overall weight of the battery cover assembly 1 within a reasonable range.

[0050] Specifically, in some embodiments, the thickness b of the baffle 15 is 0.6 mm.

[0051] In some embodiments, the thickness of the insulating member 13 at the bottom wall of the groove 131 is c, satisfying: 1 mm ≤ c ≤ 1.5 mm.

[0052] By controlling the thickness c of the insulating member 13 at the bottom wall of the groove 131 within the range of 1 mm to 1.5 mm, it is possible to ensure the mechanical strength of the insulating member 13 at the groove 131 and at the same time control the overall weight of the battery cover assembly 1 within a reasonable range.

[0053] Specifically, in some embodiments, the thickness c of the insulating member 13 at the bottom wall of the groove 131 is 1 mm.

[0054] In some embodiments, it also satisfies: 0.35 ≤ b / c ≤ 0.65.

[0055] By controlling the ratio b / c between the thickness b of the baffle 15 and the thickness c of the insulating member 13 at the bottom wall of the groove 131 within the range of 0.35 to 0.65, it is possible to make the structural strength between the groove 131 of the insulating member 13 and the baffle 15 more reasonable and ensure that the baffle 15 blocks the impact brought by the sloshing electrolyte 6.

[0056] In some embodiments, a plurality of baffles 15 are provided and arranged at intervals along the length direction of the exhaust cavity 14.

[0057] Refer to Figure 1 and Figure 2 , in this embodiment, three baffles 15 are provided, and the three baffles 15 are arranged at intervals in the length direction of the exhaust cavity 14. Since the length direction of the groove 131 is the width direction of the insulating member 13, that is, a plurality of baffles 15 are arranged at intervals along the width direction of the insulating member 13.

[0058] Specifically, the insulating member 13 is a plastic part.

[0059] In some embodiments, a plurality of exhaust holes are provided on the bottom wall of the groove 131.

[0060] According to an embodiment of the present utility model, in a second aspect, there is also provided a battery, which includes a housing 2, an electrode group 3, and the battery cover assembly 1 according to any one of the above technical solutions. The housing 2 has a receiving cavity and an open end; the electrode group 3 is disposed in the receiving cavity of the housing 2; the battery cover assembly 1 is disposed at the open end of the housing 2 to encapsulate the electrode group 3 in the housing 2, and the exhaust cavity 14 communicates with the receiving cavity of the housing 2.

[0061] For the battery provided by the embodiment of the present utility model, since the battery includes the battery cover assembly 1, by providing a baffle 15 in the exhaust cavity 14, the exhaust cavity 14 is divided into multiple partition chambers by the baffle 15. Thus, when the electrolyte 6 accumulates, it will disperse into multiple partition chambers. Therefore, when the battery pack is vibrated and causes the electrolyte 6 to slosh back and forth in the exhaust cavity 14, the impact force of the electrolyte 6 on the explosion-proof valve 12 can be weakened, blocking the sloshing of the electrolyte 6 from impacting the explosion-proof valve 12 and preventing the explosion-proof valve 12 from cracking and leaking liquid, playing a protective role for the explosion-proof valve 12, and thus improving the safety performance of the battery and the whole vehicle.

[0062] In addition, the battery provided by the embodiment of the present utility model has all the beneficial effects of the battery cover assembly 1, which will not be elaborated herein.

[0063] According to an embodiment of the present utility model, in a third aspect, there is also provided a power device, which includes the battery according to the above technical solution.

[0064] Since the power device includes the battery and has the same effects as the battery, they will not be elaborated herein.

[0065] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that, Comprising: A cover plate, on which an explosion-proof valve is provided. An insulating member, which is provided on the inner surface of the cover plate. An exhaust cavity is provided between the insulating member and the cover plate at a position corresponding to the explosion-proof valve. At least one baffle, which is provided in the exhaust cavity and divides the exhaust cavity into a plurality of partition chambers.

2. The battery cover assembly according to claim 1, wherein, A groove is provided at the position of the insulating member corresponding to the explosion-proof valve. The cavity between the groove and the cover plate forms the exhaust cavity.

3. The battery cover assembly according to claim 2, characterized in that, One side edge of the baffle is connected to the bottom wall of the groove, and the other side edge of the baffle extends towards the cover plate.

4. The battery cover plate assembly according to claim 3, characterized in that, An included angle α exists between the baffle and the bottom wall of the groove, satisfying: 45° ≤ α ≤ 80°.

5. The battery cover assembly according to any one of claims 2 to 4, characterized in that, The thickness of the baffle is b, satisfying: 0.5 mm ≤ b ≤ 0.7 mm.

6. The battery cover assembly according to claim 5, characterized in that The thickness of the insulating member at the bottom wall of the groove is c, satisfying: 1 mm ≤ c ≤ 1.5 mm.

7. The battery cover plate assembly according to claim 6, characterized in that, It also satisfies: 0.35 ≤ b / c ≤ 0.

65.

8. The battery cover plate assembly according to any one of claims 1 to 4, characterized in that, A plurality of the baffles are provided and are arranged at intervals along the length direction of the exhaust cavity.

9. A battery, characterized in that, Comprising: A housing, which has a receiving cavity and an open end. A pole group, which is provided in the receiving cavity of the housing. The battery cover plate assembly according to any one of claims 1 to 8, which is provided at the open end of the housing to encapsulate the pole group in the housing, and the exhaust cavity communicates with the receiving cavity of the housing.

10. A power device, characterized in that, Including the battery according to claim 9.

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