Battery cell, end plate and battery pack

Abstract

The utility model discloses a single battery, an end plate and a battery pack. The single battery comprises a shell, an end plate and a battery cover, a pole group; an anti-explosion valve is arranged on the cover plate; the end plate is arranged between the cover plate and the pole group, a cavity is defined by the cover plate and the end plate, the cavity and the explosion-proof valve are oppositely arranged, a through hole is formed in the top wall of the cavity, a shielding piece is arranged in the cavity, the shielding piece is connected with the end plate in a hot melting and riveting mode, and the end plate is arranged in the cavity. And the projection of the through hole towards the shielding piece falls into the outline of the shielding piece. According to the single battery disclosed by the utility model, the shielding piece is arranged on one side, facing the anti-explosion valve, of the end plate, so that the electrolyte can impact the shielding piece when the battery is shaken, the electrolyte can be prevented from directly impacting the anti-explosion valve, the service life of the anti-explosion valve is prolonged, the connection mode of hot melting riveting is simple and reliable, and the safety coefficient of the single battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery cell, an end plate and a battery pack. Background Art

[0002] In the related art, it is pointed out that when the explosion-proof valve of the blade battery cell cover plate is located at the bottom of the battery pack, 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 slosh back and forth, constantly impacting the explosion-proof valve, causing damage to the explosion-proof valve, leakage of the battery cell, and premature opening of the explosion-proof valve. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell, wherein a shielding member is provided on one side of the end plate facing the explosion-proof valve. When the battery is shaken, the electrolyte will impact the shielding member, thus avoiding direct impact of the electrolyte on the explosion-proof valve.

[0004] The utility model also provides an end plate.

[0005] The utility model also provides a battery pack.

[0006] The battery cell according to the first aspect of the utility model includes: a housing, an accommodation cavity is formed in the housing; a pole group, the pole group is arranged in the accommodation cavity; a cover plate, an explosion-proof valve is provided on the cover plate, and the cover plate is arranged at the opening position of the accommodation cavity; an end plate, the end plate is arranged between the cover plate and the pole group, the cover plate and the end plate define a cavity, the cavity is arranged opposite to the explosion-proof valve, a through hole is formed on the top wall of the cavity, a shielding member is arranged in the cavity, the shielding member is connected to the end plate by hot melt riveting, and the projection of the through hole towards the shielding member falls within the contour of the shielding member.

[0007] According to the battery cell of the utility model, by providing a shielding member on one side of the end plate facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the shielding member, which can avoid direct impact of the electrolyte on the explosion-proof valve, increase the service life of the explosion-proof valve, and when the battery undergoes thermal runaway, it can ensure that the explosion-proof valve can open in time. Moreover, the connection method of hot melt riveting is simple and reliable, improving the safety factor of the battery cell.

[0008] In some embodiments, the shielding member is spaced apart from the top wall of the cavity, and an air passage is defined between the shielding member and the top wall of the cavity, and the air passage is communicated with the through hole.

[0009] In some embodiments, riveting posts are formed in the cavity, and riveting holes are formed on the shielding member, and the riveting holes are adapted to allow the riveting posts to pass through.

[0010] In some embodiments, a through groove is formed in the shielding member, the through groove penetrates the shielding member in the thickness direction of the shielding member, the through groove and the inner wall of the cavity define a connection channel, and the connection channel communicates with the ventilation channel.

[0011] In some embodiments, the distance between the shielding member and the top wall of the cavity is not less than 1 mm, and / or the distance between the surface of the shielding member facing away from the ventilation channel and the plane where the opening side of the cavity is located is not less than 0 mm.

[0012] In some embodiments, the shielding member is an epoxy resin member, a metal member or a plastic member.

[0013] In some embodiments, the explosion-proof valve includes an explosion-proof sheet, the explosion-proof sheet covers at least a part of the through holes, there are a plurality of the through holes, the plurality of through holes are arranged in an array, and each through hole penetrates the end plate in the thickness direction of the end plate.

[0014] In some embodiments, the battery cell further includes: a plastic part, and the plastic part is located between the cover plate and the end plate.

[0015] For the end plate according to the second aspect of the present invention, a cavity is formed in the end plate, through holes are formed in the top wall of the cavity, a shielding member is arranged in the cavity, the shielding member is connected to the end plate by hot melt riveting, and the projection of the through hole towards the shielding member falls within the contour of the shielding member.

[0016] For the end plate according to the present invention, by providing a shielding member on the side of the end plate facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the shielding member, which can prevent the electrolyte from directly impacting the explosion-proof valve, increasing the service life of the explosion-proof valve. When the battery undergoes thermal runaway, it can ensure that the explosion-proof valve can open in time. Moreover, the connection method of hot melt riveting is simple and reliable, improving the safety factor of the battery cell.

[0017] The battery pack according to the third aspect of the present invention includes a plurality of battery cells according to the first aspect of the present invention above.

[0018] For the battery pack according to the present invention, by providing the battery cell of the first aspect above, the overall performance of the battery pack is improved, the failure rate of the battery pack is reduced, and the safety performance of the battery pack is enhanced.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0020] Figure 1Schematic diagram of a battery cell according to an embodiment of the present invention;

[0021] Figure 2 is Figure 1 Schematic diagram of the end plate shown in;

[0022] Figure 3 is Figure 2 Exploded view of the end plate shown in;

[0023] Figure 4 is Figure 2 Front view schematic diagram of the end plate shown in;

[0024] Figure 5 is Figure 4 Schematic diagram of the A-A cross-section of the end plate shown in;

[0025] Figure 6 is Figure 2 Rear view schematic diagram of the end plate shown in.

[0026] Reference numerals:

[0027] 100, battery cell; 1, housing; 2, cover plate; 3, end plate; 31, through hole; 32, ventilation channel; 33, riveting post; 34, cavity; 35, connection channel; 4, shielding member; 41, riveting hole; 42, through slot; 5, explosion-proof sheet; 6, plastic part; 7, electrode group; 8, spacer block. Detailed implementation manners

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0029] Reference will be made below to Figures 1-6 Describe the battery cell 100 according to the first aspect embodiment of the present invention.

[0030] As Figure 1 and Figure 2 shown, the battery cell 100 according to the first aspect embodiment of the present invention includes: a housing 1, an electrode group 7, a cover plate 2, and an end plate 3.

[0031] Specifically, a receiving cavity is formed inside the housing 1, the electrode group 7 is disposed in the receiving cavity, an explosion-proof valve is provided on the cover plate 2, the cover plate 2 is disposed at the opening position of the receiving cavity, the end plate 3 is disposed between the cover plate 2 and the electrode group 7, the cover plate 2 and the end plate 3 define a cavity 34, the cavity 34 is disposed opposite to the explosion-proof valve, a through hole 31 is formed on the top wall of the cavity 34, a shielding member 4 is disposed in the cavity 34, the shielding member 4 is connected to the end plate 3 by hot melt riveting, and the projection of the through hole 31 towards the shielding member 4 falls within the contour of the shielding member 4. Thus, the structure of the end plate 3 is simple, the structure of the battery cell 100 is simplified, and the safety factor of the battery cell 100 is improved.

[0032] After the cover plate 2 closes the housing 1, the housing 1 can be filled with electrolyte. When the battery is shaken, the electrolyte inside the housing 1 will shake back and forth, which is likely to impact the explosion-proof valve. If the housing 1 continues to shake, the electrolyte will continuously impact the explosion-proof valve, which is likely to damage the explosion-proof valve and even cause the electrolyte to leak. Additionally, if the impact force of the electrolyte on the explosion-proof valve is relatively large, it is also likely to cause the explosion-proof valve to be opened, thereby affecting the service life of the battery. Based on this, the present application provides a shielding member 4 on the end plate 3, and the shielding member 4 can reduce the impact of the electrolyte on the explosion-proof valve, thereby protecting the explosion-proof valve.

[0033] The projection of the through hole 31 towards the shielding member 4 all falls within the contour of the shielding member 4, that is, the shielding member 4 can completely separate the explosion-proof valve from the through hole 31. When the battery is shaken, the electrolyte directly impacts the shielding member 4, which can prevent the electrolyte from directly impacting the explosion-proof valve and improve the safety of the explosion-proof valve.

[0034] For the battery cell 100 according to an embodiment of the present utility model, by providing a shielding member 4 on the side of the end plate 3 facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the shielding member 4, which can prevent the electrolyte from directly impacting the explosion-proof valve, increase the service life of the explosion-proof valve. When the battery undergoes thermal runaway, it can ensure that the explosion-proof valve can open in time. Moreover, the connection method of hot melt riveting is simple and reliable, which improves the safety factor of the battery cell 100.

[0035] In some embodiments of the present utility model, as Figure 5 shown, the shielding member 4 is spaced apart from the top wall of the cavity 34, and an air ventilation channel 32 is defined between the shielding member 4 and the top wall of the cavity 34, and the air ventilation channel 32 is communicated with the through hole 31. It can be understood that since the air ventilation channel 32 is communicated with the through hole 31, even if the shielding member 4 is provided, it will not affect the outflow of the high-temperature gas ejected by the explosion-proof valve after opening from the battery cell 100. At the same time, the shielding member 4 effectively prevents the electrolyte from directly impacting the explosion-proof film 5 and reduces the risk of the explosion-proof film 5 cracking caused by the electrolyte impacting the explosion-proof valve.

[0036] In some embodiments of the present utility model, as Figure 3As shown, a riveting post 33 is formed in the cavity 34, and a riveting hole 41 is formed in the shielding member 4. The riveting hole 41 is adapted for the riveting post 33 to penetrate. The connection mode between the shielding member 4 and the end plate 3 is simple and the connection structure is stable. After the riveting post 33 passes through the riveting hole 41, the riveting post 33 is heated to the melting temperature, and then the top of the riveting post 33 is hot-pressed and shaped, thereby completing the riveting connection between the shielding member 4 and the end plate 3.

[0037] In some embodiments of the present utility model, as Figure 5 shown, a through groove 42 is formed in the shielding member 4. The through groove 42 penetrates the shielding member 4 in the thickness direction of the shielding member 4. The through groove 42 and the inner wall of the cavity 34 define a connection channel 35, and the connection channel 35 communicates with the ventilation channel 32. Specifically, the inner wall of the cavity 34 and the side wall of the through groove 42 define the ventilation channel 32, and the ventilation channel 32 communicates with the through hole 31. When the battery undergoes thermal runaway, the high-temperature gas in the battery can be transmitted to the explosion-proof valve through the ventilation channel 32 and the through hole 31, and the high-temperature gas is discharged through the opening of the explosion-proof valve, ensuring that the explosion-proof valve can open in time.

[0038] In some embodiments of the present utility model, the distance between the shielding member 4 and the top wall of the cavity 34 is not less than 1 mm, and / or the distance between the surface of the shielding member 4 facing away from the ventilation channel 32 and the plane where the opening side of the cavity 34 is located is not less than 0 mm. For example, the distance between the shielding member 4 and the top wall of the cavity 34 can be: 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, etc.; the distance between the surface of the shielding member 4 facing away from the ventilation channel 32 and the plane where the opening side of the cavity 34 is located can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc.

[0039] As Figure 3 shown, a spacer 8 is provided between the shielding member 4 and the top wall of the cavity 34, and the spacer 8 is used to space apart the shielding member 4 and the top wall of the cavity 34.

[0040] Specifically, the epoxy resin part is constructed of epoxy resin material. 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. Optionally, the shielding member 4 is an epoxy resin part, a metal part or a plastic part.

[0041] In some embodiments of the present utility model, the explosion-proof valve includes an explosion-proof sheet 5, and the explosion-proof sheet 5 covers at least a part of the through holes 31. There are multiple through holes 31, which are arranged in an array, and each through hole 31 penetrates the end plate 3 in the thickness direction of the end plate 3. Thus, the provision of the through holes 31 enables the gas in the battery cell 100 to flow out of the battery cell 100, ensuring the safety performance of the battery cell 100, reducing the failure rate of the battery cell 100, having a simple structure, ingenious design, being convenient for production and assembly, reducing the production difficulty, and improving the production efficiency.

[0042] In some embodiments of the present utility model, the battery cell 100 further includes: a plastic part 6, and the plastic part 6 is located between the cover plate 2 and the end plate 3. Thus, the provision of the plastic part 6 prevents the electrodes from contacting the housing 1 and causing a short circuit, and maintains the stability of the internal structure of the battery, enhancing the environmental adaptability and long-term usability of the battery.

[0043] According to the end plate 3 of the second aspect embodiment of the present utility model, the end plate 3 forms a cavity 34, through holes 31 are formed on the top wall of the cavity 34, a shielding member 4 is provided in the cavity 34, the shielding member 4 is connected to the end plate 3 by hot melt riveting, and the projection of the through hole 31 towards the shielding member 4 falls within the contour of the shielding member 4.

[0044] According to the end plate 3 of the embodiment of the present utility model, by providing a shielding member 4 on the side of the end plate 3 facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the shielding member 4, which can prevent the electrolyte from directly impacting the explosion-proof valve, increasing the service life of the explosion-proof valve. When the battery undergoes thermal runaway, it can ensure that the explosion-proof valve can open in time. Moreover, the connection method of hot melt riveting is simple and reliable, improving the safety factor of the battery cell 100.

[0045] According to the battery pack of the third aspect embodiment of the present utility model, it includes a plurality of battery cells 100 according to the first aspect embodiment of the present utility model above.

[0046] According to the battery pack of the embodiment of the present utility model, by providing the battery cell 100 of the first aspect embodiment above, the overall performance of the battery pack is improved, the failure rate of the battery pack is reduced, and the safety performance of the battery pack is enhanced.

[0047] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is 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, and therefore should not be construed as a limitation to the present utility model.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed 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" means two or more, unless otherwise specifically defined.

[0049] In the present utility model, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of 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.

[0050] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 utility model. 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. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0051] Although the embodiments of the present utility model 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 utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, Comprising: A housing, within which an accommodation cavity is formed; An electrode group, which is disposed within the accommodation cavity; A cover plate, on which an explosion-proof valve is provided, and the cover plate is disposed at the opening position of the accommodation cavity; An end plate, which is disposed between the cover plate and the electrode group. The cover plate and the end plate define a cavity, and the cavity is disposed opposite to the explosion-proof valve. A through hole is formed on the top wall of the cavity. A shielding member is provided within the cavity, and the shielding member is connected to the end plate by hot melt riveting. The projection of the through hole towards the shielding member falls within the contour of the shielding member.

2. The battery cell according to claim 1, characterized in that, The shielding member is spaced apart from the top wall of the cavity, and an air vent passage is defined between the shielding member and the top wall of the cavity. The air vent passage is communicated with the through hole.

3. The battery cell according to claim 2, wherein A riveting post is formed within the cavity, and a riveting hole is formed on the shielding member. The riveting hole is adapted for the riveting post to penetrate therethrough.

4. The battery cell according to claim 3, wherein, A through groove is formed on the shielding member, and the through groove penetrates the shielding member in the thickness direction of the shielding member. The through groove and the inner wall of the cavity define a connection passage, and the connection passage is communicated with the air vent passage.

5. The battery cell according to claim 4, wherein, The distance between the shielding member and the top wall of the cavity is not less than 1 mm, and / or the distance between the surface of the shielding member facing away from the air vent passage and the plane where the opening side of the cavity is located is not less than 0 mm.

6. The battery cell according to any one of claims 1-5, characterized in that, The shielding member is an epoxy resin member, a metal member or a plastic member.

7. The battery cell according to any one of claims 1-5, characterized in that, The explosion-proof valve includes an explosion-proof sheet, and the explosion-proof sheet covers at least a part of the through hole. There are multiple through holes, and the multiple through holes are arranged in an array, and each through hole penetrates the end plate in the thickness direction of the end plate.

8. The battery cell according to any one of claims 1-5, characterized in that, Further comprising: A plastic part, which is located between the cover plate and the end plate.

9. An end plate, characterized in that, The end plate forms a cavity, a through hole is formed on the top wall of the cavity, a shielding member is provided within the cavity, and the shielding member is connected to the end plate by hot melt riveting. The projection of the through hole towards the shielding member falls within the contour of the shielding member.

10. A battery pack, characterized in that, Comprising a plurality of battery cells according to any one of claims 1-8.

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