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, and the cover plate is arranged at the opening position of the containing cavity; 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 rib group is formed in the cavity, the rib group and the through hole are oppositely arranged, and the end plate is arranged between the cover plate and the pole group. And the projection of the through hole towards the rib group falls into the outline of the rib group. According to the single battery disclosed by the utility model, the rib group is arranged on one side, facing the anti-explosion valve, of the end plate, so that when the battery is shaken, electrolyte can impact the rib group, the electrolyte can be prevented from directly impacting the anti-explosion valve, the service life of the anti-explosion valve is prolonged, and when the battery is in thermal runaway, the anti-explosion valve can be ensured to be opened in time; 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, and 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 shake back and forth, continuously 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 at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides a battery cell, in which a rib group is arranged on one side of the end plate facing the explosion-proof valve. When the battery is shaken, the electrolyte will impact the rib group, which can prevent the electrolyte from directly impacting 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, in which a receiving cavity is formed; an electrode group, which is arranged in the receiving cavity; a cover plate, on which an explosion-proof valve is arranged, and the cover plate is arranged at the opening position of the receiving cavity; an end plate, which is arranged between the cover plate and the electrode 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 rib group is formed in the cavity, the rib group is arranged opposite to the through hole, and the projection of the through hole towards the rib group falls within the contour of the rib group.

[0007] According to the battery cell of the utility model, by arranging a rib group on one side of the end plate facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the rib group, which can prevent the electrolyte from directly impacting 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, improving the safety factor of the battery cell.

[0008] In some embodiments, the rib group is arranged at an interval from the top wall of the cavity, and a ventilation channel is defined between the rib group and the top wall of the cavity, and the ventilation channel is communicated with the through hole.

[0009] In some embodiments, the rib group includes at least one rib, and the rib extends along a first direction, and / or, the rib extends along a second direction.

[0010] In some embodiments, there are multiple rib groups, and the multiple rib groups are stacked and spaced apart in the thickness direction of the end plate.

[0011] In some embodiments, the rib group is integrally formed with the end plate, and the end plate is formed as a plastic part.

[0012] In some embodiments, there are multiple through holes, 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.

[0013] In some embodiments, the explosion-proof valve includes an explosion-proof sheet, and the explosion-proof sheet covers at least part of the through holes.

[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, the end plate forms a cavity, a through hole is formed on the top wall of the cavity, a rib group is formed in the cavity, the rib group is disposed opposite to the through hole, and the projection of the through hole towards the rib group falls within the contour of the rib group.

[0016] For the end plate according to the present invention, by providing a rib group on the side of the end plate facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the rib group, 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 apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 3 isFigure 2 Front elevation schematic view of the end plate shown in

[0023] Figure 4 is Figure 3 Schematic cross-sectional view A-A of the end plate shown in

[0024] Figure 5 is Figure 2 Rear elevation schematic view of the end plate shown in

[0025] Reference numerals:

[0026] 100, battery cell; 1, housing; 2, cover plate; 3, end plate; 31, through hole; 32, ventilation passage; 33, cavity; 4, rib group; 41, rib; 5, explosion-proof sheet; 6, plastic part; 7, electrode group. Specific embodiments

[0027] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where 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 intended to explain the present invention and should not be construed as limiting the present invention.

[0028] Below, reference is made to Figures 1-5 Describe the battery cell 100 according to the embodiment of the first aspect of the present invention.

[0029] As Figures 1-5 shown, the battery cell 100 according to the embodiment of the first aspect of the present invention includes: a housing 1, an electrode group 7, a cover plate 2, and an end plate 3.

[0030] Specifically, a receiving cavity is formed in 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 33, the cavity 33 is disposed opposite to the explosion-proof valve, a through hole 31 is formed on the top wall of the cavity 33, a rib group 4 is formed in the cavity 33, the rib group 4 is disposed opposite to the through hole 31, and the projection of the through hole 31 towards the rib group 4 falls within the contour of the rib group 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.

[0031] After the cover plate 2 closes the housing 1, the housing 1 can be filled with electrolyte. When the battery is shaken, the electrolyte in the housing 1 will slosh 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, easily damaging the explosion-proof valve and even causing 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 push open the explosion-proof valve, thereby affecting the service life of the battery. Based on this, in this application, a rib group 4 is provided on the end plate 3, and the rib group 4 can reduce the impact of the electrolyte on the explosion-proof valve, thereby protecting the explosion-proof valve.

[0032] The projections of the through holes 31 towards the rib group 4 all fall within the contour of the rib group 4, that is, the rib group 4 can completely separate the explosion-proof valve from the through holes 31. When the battery is shaken, the electrolyte directly impacts the rib group 4, which can prevent the electrolyte from directly impacting the explosion-proof valve and improve the safety of the explosion-proof valve.

[0033] For the battery cell 100 according to an embodiment of the present utility model, by providing a rib group 4 on the side of the end plate 3 facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the rib group 4, which can prevent the electrolyte from directly impacting 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 the valve in a timely manner, improving the safety factor of the battery cell 100.

[0034] In some embodiments of the present utility model, as Figure 4 shown, the rib group 4 is spaced apart from the top wall of the cavity 33, and a ventilation channel 32 is defined between the rib group 4 and the top wall of the cavity 33. The ventilation channel 32 is communicated with the through hole 31. It can be understood that since the ventilation channel 32 is communicated with the through hole 31, even if the rib group 4 is provided, it will not affect the outflow of the high-temperature gas ejected after the explosion-proof valve opens from the battery cell 100. At the same time, the rib group 4 effectively prevents the electrolyte from directly impacting the explosion-proof film 5, reducing the risk of the explosion-proof film 5 cracking caused by the electrolyte impacting the explosion-proof valve.

[0035] In some embodiments of the present utility model, the rib group 4 includes at least one rib 41, and the rib 41 extends along a first direction, and / or, the rib 41 extends along a second direction. That is to say, the rib 41 can extend along the first direction, the rib 41 can extend along the second direction, or a part of the ribs 41 can extend along the first direction and another part of the ribs 41 can extend along the second direction. Thus, it is ensured that the electrolyte cannot directly impact the explosion-proof valve under different arrangements of the through holes 31, expanding the applicable range of the rib group 4 and improving the safety and reliability of the explosion-proof valve.

[0036] Here, the first direction is the length direction of the end plate, the second direction is the width direction of the end plate, and the first direction and the second direction are perpendicular to each other.

[0037] In some embodiments of the present utility model, there are multiple rib groups 4, and the multiple rib groups 4 are stacked and arranged at intervals in the thickness direction of the end plate 3. That is to say, the multiple rib groups 4 are stacked and arranged at intervals, ensuring that the high-temperature gas can flow smoothly to the position of the explosion-proof valve and flow out from the explosion-proof valve. In this way, while ensuring that the high-temperature gas ejected after the explosion-proof valve opens does not affect the outflow from the battery cell 100, the direct impact of the electrolyte on the explosion-proof valve is avoided. The structural design is ingenious, improving the safety and reliability of the explosion-proof valve.

[0038] In some embodiments of the present utility model, the rib group 4 and the end plate 3 are integrally formed. The plastic part has good corrosion resistance and a light material. The end plate 3 is formed as a plastic part. In this way, the processing technology of fixing the rib group 4 to the end plate 3 can be omitted, and at the same time, the structural strength of the rib group 4 can be improved.

[0039] In some embodiments of the present utility model, as Figure 5 shown, there are multiple through holes 31, and the multiple through holes 31 are arranged in an array, and each through hole 31 penetrates the end plate 3 in the thickness direction of the end plate 3.

[0040] 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 part of the through holes 31. There are multiple through holes 31, and the multiple through holes 31 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 arrangement 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, with a simple structure, ingenious design, convenient for production and assembly, reducing the production difficulty and improving the production efficiency.

[0041] 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. In this way, the plastic part 6 is used to isolate the cover plate 2 and the end plate 3, preventing the cover plate 2 and the end plate 3 from contacting and causing problems such as battery short circuit, improving the safety of the battery.

[0042] According to the end plate 3 of the second aspect embodiment of the present utility model, the end plate 3 forms a cavity 33. A through hole 31 is formed on the top wall of the cavity 33, and a rib group 4 is formed in the cavity 33. The rib group 4 is disposed opposite to the through hole 31, and the projection of the through hole 31 towards the rib group 4 falls within the contour of the rib group 4.

[0043] According to the end plate 3 of the embodiment of the present utility model, by providing a rib group 4 on the side of the end plate 3 facing the explosion-proof valve, when the battery is shaken, the electrolyte will impact the rib group 4, which can avoid the direct impact of the electrolyte on 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, improving the safety factor of the battery cell 100.

[0044] The battery pack according to the third - aspect embodiment of the present utility model includes a plurality of battery cells 100 according to the first - aspect embodiment of the present utility model described above.

[0045] The battery pack according to the embodiment of the present utility model improves the overall performance of the battery pack, reduces the failure rate of the battery pack, and enhances the safety performance of the battery pack by providing the battery cell 100 according to the first - aspect embodiment described above.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "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. It 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. Therefore, it should not be construed as a limitation to the present utility model.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot 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 of" means two or more unless otherwise specifically defined.

[0048] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", 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 it 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.

[0049] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. 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 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.

[0050] 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 spirit 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: include: A housing having a receiving cavity formed therein; A pole group, the pole group is arranged in the accommodating cavity; A cover plate, wherein an explosion-proof valve is provided on the cover plate, and the cover plate is arranged at the opening position of the accommodating cavity; An end plate, wherein 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 rib group is formed in the cavity, the rib group and the through hole are arranged opposite to each other, and the projection of the through hole toward the rib group falls within the contour of the rib group.

2. The battery cell according to claim 1, characterized in that: The rib group is spaced apart from the top wall of the cavity, a ventilation channel is defined between the rib group and the top wall of the cavity, and the ventilation channel is communicated with the through hole.

3. The battery cell according to claim 2, characterized in that: The rib group includes at least one rib, the rib extends along a first direction, and / or the rib extends along a second direction.

4. The battery cell according to claim 3, characterized in that: The rib groups include a plurality of rib groups, and the plurality of rib groups are stacked and spaced apart in the thickness direction of the end plate.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The rib group and the end plate are integrally formed, and the end plate is formed as a plastic part.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The through holes include a plurality of through holes arranged in an array, and each of the through holes is disposed through the end plate in a thickness direction of the end plate.

7. The battery cell according to claim 6, characterized in that: The explosion-proof valve includes an explosion-proof disk, and the explosion-proof disk covers at least a portion of the through hole.

8. The battery cell according to any one of claims 1 to 4, characterized in that: Also includes: A plastic part 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 rib group is formed in the cavity, the rib group is arranged opposite to the through hole, and the projection of the through hole toward the rib group falls within the contour of the rib group.

10. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 8.

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