Battery cover plate and battery

Abstract

The utility model discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate, an end plate and a shielding piece, and an anti-explosion valve is arranged on the cover plate; the end plate is arranged between the cover plate and the pole group, a groove with an opening facing the cover plate is formed in the end plate, the groove and the anti-explosion valve are oppositely arranged, and a through hole is formed in the bottom wall of the groove; the shielding piece comprises a baffle and a plurality of fixing plates, the fixing plates are arranged in the circumferential direction of the baffle at intervals, the baffle is located at the opening of the groove, the fixing plates are fixedly connected with the end plate, the projections, facing the baffle, of the through holes all fall into the outline of the baffle, and the baffle and the side wall of the groove are arranged at intervals to define exhaust channels communicated with the through holes. According to the battery cover plate disclosed by the utility model, by arranging the shielding piece, not only can the pressure release of the battery during thermal runaway be ensured, but also the impact of electrolyte on the anti-explosion valve can be well avoided, the anti-explosion valve is effectively protected, the service life of the battery is prolonged, and the shielding piece is arranged on the end plate, so that the assembly difficulty can be reduced, and the assembly efficiency can be improved.

Description

Technical Field

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

[0002] In the related art, after the battery cover plate and the shell are welded, a cavity is formed between the inner end plate of the battery cell and the explosion-proof valve, and the electrolyte will accumulate in the cavity; when the battery is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve, which is likely to cause damage to the explosion-proof valve and leakage of the battery cell, and even cause the explosion-proof valve to open in advance. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a battery cover plate which can not only ensure pressure relief when the battery undergoes thermal runaway, but also preferably avoid the electrolyte from impacting the explosion-proof valve, and has low assembly difficulty and high assembly efficiency.

[0004] The utility model also provides a battery with the above battery cover plate.

[0005] The battery cover plate according to the first aspect embodiment of the utility model is used for a battery, the battery includes a shell and a pole group located in the shell, and the battery cover plate includes: a cover plate provided with an explosion-proof valve thereon; an end plate disposed between the cover plate and the pole group, the end plate is formed with a groove with an opening facing the cover plate, the groove is disposed opposite to the explosion-proof valve, and a through hole is formed on the bottom wall of the groove; a shielding member including a baffle and a plurality of fixing plates, the plurality of fixing plates are arranged at intervals along the circumferential direction of the baffle, the baffle is located at the opening of the groove, the fixing plates are fixedly connected with the end plate, the projections of the plurality of through holes facing the baffle all fall within the contour of the baffle, and the baffle is spaced from the side wall of the groove to define an exhaust passage communicating with the through hole.

[0006] According to the battery cover plate of the embodiment of the utility model, by providing the shielding member, it can not only ensure pressure relief when the battery undergoes thermal runaway, but also preferably avoid the electrolyte from impacting the explosion-proof valve, effectively protecting the explosion-proof valve, improving the service life of the battery, and the shielding member is installed on the end plate, which can reduce the assembly difficulty and improve the assembly efficiency.

[0007] According to some embodiments of the utility model, the fixing plate is adhesively connected with the end plate.

[0008] According to some embodiments of the utility model, a plurality of first notches are provided on the side wall of the groove, the number of the first notches is equal to and corresponds to the number of the fixing plates one by one, and the fixing plates are located in the corresponding first notches.

[0009] According to some embodiments of the present utility model, the groove includes a first groove and a second groove spaced apart from each other. The baffle includes a first baffle, a second baffle, and a connecting plate connected between the first baffle and the second baffle. The first baffle is located at the opening of the first groove, the second baffle is located at the opening of the second groove, and there is a second notch on the side wall between the first groove and the second groove. The connecting plate is located within the second notch.

[0010] According to some embodiments of the present utility model, the surface of the shielding member facing away from the through hole is a first surface, and the surface of the end plate facing away from the through hole is a second surface. The first surface and the second surface are coplanar.

[0011] According to some embodiments of the present utility model, the circumferential side surface of the shielding member and the circumferential side surface of the baffle are coplanar.

[0012] According to some embodiments of the present utility model, the shielding member is an integrally formed part.

[0013] According to some embodiments of the present utility model, the shielding member is an epoxy resin part, a metal part, or a plastic part.

[0014] According to some embodiments of the present utility model, the battery cover plate further includes: a lower plastic part, and the lower plastic part is located between the cover plate and the end plate.

[0015] The battery according to the second aspect embodiment of the present utility model includes: the battery cover plate according to the first aspect embodiment of the present utility model above.

[0016] By providing the above battery cover plate, the battery according to the embodiment of the present utility model can not only ensure pressure relief when the battery undergoes thermal runaway, but also better avoid the impact of the electrolyte on the explosion-proof valve, effectively protecting the explosion-proof valve and improving the service life of the battery.

[0017] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0019] Figure 1 is a schematic diagram of the cooperation between the shielding member and the end plate according to some embodiments of the present utility model;

[0020] Figure 2 is Figure 1 the exploded view of the shielding member and the end plate in

[0021] Figure 3 is Figure 1 The top view after the shielding member in [it] is fitted with the end plate;

[0022] Figure 4 is a schematic diagram of an end plate according to some embodiments of the present utility model;

[0023] Figure 5 is Figure 4 the top view of the end plate in [it];

[0024] Figure 6 is an exploded view of a battery according to some embodiments of the present utility model.

[0025] Reference numerals:

[0026] 100, battery; 101, battery cover plate;

[0027] 11, cover plate; 111, explosion-proof valve; 12, lower plastic part; 13, housing;

[0028] 2, end plate; 21, groove; 211, first groove; 212, second groove; 22, through hole; 23, first notch; 24, second notch; 25, second surface;

[0029] 3, shielding member; 31, baffle plate; 311, first baffle plate; 312, second baffle plate; 313, connecting plate; 32, fixing plate; 33, first surface;

[0030] 4, exhaust passage. Detailed implementation manners

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; 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 communication inside two elements or the interaction relationship between two elements. 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 circumstances.

[0034] Next, reference is made to Figures 1-6 Describe the battery cover plate 101 according to an embodiment of the present utility model.

[0035] The battery cover plate 101 according to the first aspect embodiment of the present utility model is for a battery 100. The battery 100 includes a housing 13 and a pole group located inside the housing 13. The battery cover plate 101 includes a cover plate 11, an explosion-proof valve 111, an end plate 2, and a shielding member 3. When a thermal runaway problem occurs in the pole group inside the battery 100, the explosion-proof valve 111 can be opened, thereby reducing the thermal runaway risk of the battery 100.

[0036] After the cover plate 11 closes the housing 13, the housing 13 can be filled with electrolyte. When the battery 100 is shaken, the electrolyte inside the housing 13 will shake back and forth, which is likely to impact the explosion-proof valve 111. If the housing 13 continues to shake, the electrolyte will continuously impact the explosion-proof valve 111, which is likely to damage the explosion-proof valve 111 and even cause the electrolyte to leak. In addition, if the impact force of the electrolyte on the explosion-proof valve 111 is relatively large, it is also likely to cause the explosion-proof valve 111 to be opened, thereby affecting the service life of the battery 100. Based on this, in the present application, a shielding member 3 is provided on the side of the end plate 2 facing away from the through hole 22 and towards the explosion-proof valve 111. The shielding member 3 can reduce the impact of the electrolyte on the explosion-proof valve 111, thereby protecting the explosion-proof valve 111.

[0037] The end plate 2 is formed with a groove 21 with an opening facing the cover plate 11. The groove 21 is disposed opposite to the explosion-proof valve 111, and a through hole 22 is formed on the bottom wall of the groove 21. The shielding member 3 includes a baffle plate 31 and a plurality of fixing plates 32. The plurality of fixing plates 32 are spaced along the circumferential direction of the baffle plate 31. The baffle plate 31 is located at the opening of the groove 21, and the fixing plate 32 is fixedly connected to the end plate 2, so that the shielding member 3 can be fixed to the end plate 2. For example, the fixing plate 32 can be adhesively fixed to the end plate 2.

[0038] The projections of the through hole 22 facing the baffle plate 31 all fall within the contour of the baffle plate 31, that is, the baffle plate 31 can completely separate the explosion-proof valve 111 from the through hole 22. When the battery 100 is shaken, the electrolyte directly impacts the baffle plate 31, which can prevent the electrolyte from directly impacting the explosion-proof valve 111 and improve the safety of the explosion-proof valve 111. At the same time, the baffle plate 31 is spaced from the side wall of the groove 21 to define an exhaust passage 4. The exhaust passage 4 is communicated with the through hole 22. When the battery 100 has a thermal runaway, the high-temperature gas in the battery 100 can be transmitted to the explosion-proof valve 111 through the through hole 22 and the exhaust passage 4, and the high-temperature gas is discharged through the opening of the explosion-proof valve 111, which can ensure that the explosion-proof valve 111 can open the valve in time.

[0039] According to the battery cover plate 101 of the embodiment of the present invention, by providing the shielding member 3, not only can the pressure be relieved when the battery 100 has a thermal runaway, but also the electrolyte can be better prevented from impacting the explosion-proof valve 111, effectively protecting the explosion-proof valve 111, improving the service life of the battery 100, and the shielding member 3 is installed on the end plate 2, which can reduce the assembly difficulty and improve the assembly efficiency.

[0040] According to some embodiments of the present invention, referring to Figures 1-3 ., the fixing plate 32 is adhesively connected to the end plate 2, which can simplify the fixing method of the fixing plate 32 and the end plate 2, facilitate the fixed connection between the fixing plate 32 and the end plate 2, and can also increase the connection strength between the fixing plate 32 and the end plate 2.

[0041] According to some embodiments of the present invention, referring to Figures 1-5 ., a plurality of first notches 23 are provided on the side wall of the groove 21. The number of the first notches 23 is equal to and corresponds to the number of the fixing plates 32 one by one. The plurality of fixing plates 32 are respectively located in the corresponding first notches 23. When the shielding member 3 is installed at the opening of the groove 21, the fixing plates 32 can be installed in the first notches 23 one by one, which can play a role in positioning the installation of the shielding member 3 and can improve the installation efficiency and installation accuracy of the shielding member 3.

[0042] According to some embodiments of the present invention, referring to Figures 1-5, the groove 21 includes a first groove 211 and a second groove 212 spaced apart from each other. The baffle 31 includes a first baffle 311, a second baffle 312, and a connecting plate 313 connected between the first baffle 311 and the second baffle 312. The first baffle 311 is located at the opening of the first groove 211, the second baffle 312 is located at the opening of the second groove 212, a second notch 24 is provided on the side wall between the first groove 211 and the second groove 212, and the connecting plate 313 is located within the second notch 24.

[0043] The side wall between the first groove 211 and the second groove 212 can play a certain supporting role for the connecting plate 313, and further support the shielding member 3, which can prevent the shielding member 3 from deforming when the electrolyte impacts the shielding member 3, causing the electrolyte to directly impact the explosion-proof valve 111.

[0044] According to some embodiments of the present invention, referring to Figures 1-3 , the surface of the shielding member 3 facing away from the through hole 22 is the first surface 33, and the surface of the end plate 2 facing away from the through hole 22 is the second surface 25. The first surface 33 and the second surface 25 are coplanar, which can prevent the shielding member 3 from occupying the space outside the end plate 2, that is, the shielding member 3 does not occupy the internal space of the battery 100, and can improve the energy density of the battery 100.

[0045] According to some embodiments of the present invention, referring to Figures 1-3 , the circumferential side surface of the shielding member 3 and the circumferential side surface of the baffle 31 are coplanar, which can prevent the shielding member 3 from occupying the space outside the end plate 2, that is, the shielding member 3 does not occupy the internal space of the battery 100, and can improve the energy density of the battery 100.

[0046] According to some embodiments of the present invention, referring to Figures 1-3 , the shielding member 3 is an integrally formed part, which can eliminate the processing technology of fixing a plurality of fixing plates 32 to the baffle 31, and at the same time improve the structural strength of the shielding member 3.

[0047] According to some embodiments of the present invention, referring to Figures 1-3 , the shielding member 3 is an epoxy resin part, a metal part or a plastic part. The epoxy resin part is constructed of epoxy resin material, and the cured epoxy resin has high hardness, high tensile and compressive strength, and good fatigue resistance. The metal part can be constructed of steel material or aluminum material, with low cost and high strength. The plastic part has good corrosion resistance and light weight.

[0048] According to some embodiments of the present invention, referring to Figures 1-6, the battery cover plate 101 further includes: a lower plastic part 12, and the lower plastic part 12 is located between the cover plate 11 and the end plate 2. The lower plastic part 12 is used to isolate the cover plate 11 from the end plate 2, prevent the cover plate 11 from contacting the end plate 2, and cause problems such as short circuit of the battery 100, thereby improving the safety of the battery 100.

[0049] The battery 100 according to the second aspect embodiment of the present invention includes: the battery cover plate 101 according to the first aspect embodiment of the present invention above.

[0050] According to the battery 100 of the embodiment of the present invention, by providing the above battery cover plate 101, it can not only ensure pressure relief when the battery 100 undergoes thermal runaway, but also better avoid the impact of the electrolyte on the explosion-proof valve 111, effectively protecting the explosion-proof valve 111 and improving the service life of the battery 100.

[0051] In the description of this specification, the descriptions with reference to terms such as "some embodiments", "optionally", "further", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0052] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cover plate for a battery, characterized in that, The battery includes a housing and a pole group located within the housing. The battery cover plate includes: A cover plate, on which an explosion-proof valve is provided; An end plate, which is arranged between the cover plate and the pole group. The end plate is formed with a groove having an opening facing the cover plate. The groove is disposed opposite to the explosion-proof valve, and a plurality of through holes are formed on the bottom wall of the groove; A shielding member, which includes a baffle plate and a plurality of fixing plates. The plurality of fixing plates are arranged at intervals along the circumferential direction of the baffle plate. The baffle plate is located at the opening of the groove. The fixing plates are fixedly connected to the end plate. The projections of the plurality of through holes facing the baffle plate all fall within the contour of the baffle plate. The baffle plate is spaced from the side wall of the groove to define an exhaust passage communicating with the through holes.

2. The battery cover plate according to claim 1, wherein, The fixing plate is adhesively connected to the end plate.

3. The battery cover plate according to claim 1, characterized in that, A plurality of first notches are provided on the side wall of the groove. The number of the first notches is equal to and corresponds one by one to the number of the fixing plates. The fixing plates are located within the corresponding first notches.

4. The battery cover plate according to claim 3, characterized in that, The groove includes a first groove and a second groove which are spaced apart. The baffle plate includes a first baffle plate, a second baffle plate and a connecting plate connected between the first baffle plate and the second baffle plate. The first baffle plate is located at the opening of the first groove. The second baffle plate is located at the opening of the second groove. A second notch is provided on the side wall between the first groove and the second groove. The connecting plate is located within the second notch.

5. The battery cover plate according to claim 3, characterized in that The surface of the shielding member facing away from the through holes is a first surface, and the surface of the end plate facing away from the through holes is a second surface. The first surface and the second surface are coplanar.

6. The battery cover plate according to claim 3, characterized in that, The circumferential side surface of the shielding member and the circumferential side surface of the baffle plate are coplanar.

7. The battery cover plate according to any one of claims 1-6, characterized in that, The shielding member is an integrally formed part.

8. The battery cover plate according to any one of claims 1-6, characterized in that, The shielding member is an epoxy resin part, a metal part or a plastic part.

9. The battery cover plate according to any one of claims 1-6, characterized in that, It further includes: A lower plastic part, which is located between the cover plate and the end plate.

10. A battery, characterized in that, It includes: The battery cover plate according to any one of claims 1-9.

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