Battery cell, end plate and battery pack

Abstract

The utility model discloses a battery monomer, an end plate and a battery pack, the battery monomer comprises a shell, an end plate and a battery pack, the shell is internally provided with an accommodating cavity; the pole group is arranged in the accommodating cavity; the cover plates are provided with anti-explosion valves, and the cover plates are arranged at the two ends of the pole group in the length direction; 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 is filled with electrolyte, and a partition plate connected with the end plate is formed in the cavity. According to the battery monomer disclosed by the utility model, the partition plates are formed in the cavities of the end plates, so that the condition that the explosion-proof valve cracks and leaks liquid or is opened in advance is avoided when the battery cell shakes, and the problem that the explosion-proof valve cracks and leaks liquid or is opened in advance due to the fact that electrolyte continuously impacts the explosion-proof valve when the battery cell shakes is solved; the safety coefficient of the battery monomer is improved, and the battery monomer is simple in structure and convenient to assemble and transport.

Description

Technical Field

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

[0002] Relevant technologies point out that as lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] At present, the main structures of blade cells include: cover plate (with pole, explosion-proof valve, upper plastic, lower plastic, injection hole), shell, pole group end plate, side plate, bare cell insulation sheet, pole group, etc. After the cover plate and shell are welded, a closed space with certain mechanical strength is formed to protect the pole group; the side plate and bare cell insulation sheet are welded and fixed to the outside of the pole group; in addition, the bare cell insulation sheet is melted and fixed to the plastic parts of the positive and negative pole cover plates, so that the pole group is well fixed in the shell to avoid short circuit of the pole group.

[0004] When the blade cell cover explosion-proof valve is located at the bottom of the battery pack, a cavity is formed between the inner end plate of the 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 the explosion-proof valve to be damaged, the cell to leak, and the explosion-proof valve to open prematurely. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell, which solves the problem that the explosion-proof valve cracks and leaks or opens prematurely due to the continuous impact of electrolyte on the explosion-proof valve when the battery core shakes.

[0006] The utility model also provides an end plate.

[0007] The utility model also provides a battery pack.

[0008] The battery cell according to the first aspect of the utility model comprises: a shell having a accommodating cavity formed therein; a pole group disposed in the accommodating cavity; a cover plate having an explosion-proof valve disposed thereon, the cover plate being disposed at both ends of the pole group in a length direction; an end plate disposed between the cover plate and the pole group, the cover plate and the end plate defining a cavity, the cavity being filled with an electrolyte, and a partition connected to the end plate being formed in the cavity.

[0009] According to the battery cell of the utility model, a partition is formed in the cavity of the end plate, so that when the battery cell is shaken, the explosion-proof valve is prevented from cracking and leaking or the valve opening is prematurely prevented, thereby solving the problem of the explosion-proof valve cracking and leaking or the valve opening prematurely caused by the electrolyte constantly impacting the explosion-proof valve when the battery cell is shaken, thereby improving the safety factor of the battery cell. The battery cell has a simple structure and is easy to assemble and transport.

[0010] In some embodiments, the partition extends obliquely in a direction away from the cavity.

[0011] In some embodiments, an angle α is formed between the partition plate and the bottom wall of the end plate, and the angle α is in the range of 20°-85°.

[0012] In some embodiments, the partition includes a plurality of partitions, and the plurality of partitions are evenly spaced apart along the length direction of the end plate.

[0013] In some embodiments, the plurality of partitions divide the cavity into a plurality of sub-cavities.

[0014] In some embodiments, a through hole penetrating the end plate in the thickness direction of the end plate is formed on the bottom wall of the end plate, and the through holes include a plurality of through holes arranged in an array.

[0015] In some embodiments, the explosion-proof valve includes a bursting disk, and the bursting disk is located in the cavity.

[0016] In some embodiments, the battery cell further includes: an insulating sheet covering the electrode group and located between the electrode group and the shell; and a side plate provided on a narrow side of the electrode group and located between the electrode group and the insulating sheet.

[0017] According to the end plate of the second aspect of the utility model, a cavity is formed on the end plate, the cavity is filled with electrolyte, and a plurality of partitions connected to the end plate are formed in the cavity, and the plurality of partitions are evenly spaced along the length direction of the end plate.

[0018] According to the end plate of the utility model, a partition is formed in the cavity of the end plate, which can prevent the explosion-proof valve from cracking and leaking or premature opening when the battery cell shakes, thereby solving the problem of the explosion-proof valve cracking and leaking or premature opening caused by the electrolyte constantly impacting the explosion-proof valve when the battery cell shakes, thereby improving the safety factor of the battery cell. The battery cell has a simple structure and is easy to assemble and transport.

[0019] A battery pack according to a third aspect of the present invention comprises a plurality of battery cells according to the first aspect of the present invention.

[0020] According to the battery pack of the present invention, by providing the battery monomer of the first aspect, 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 improved.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 A schematic diagram of the end plate shown in ;

[0024] Figure 3 yes Figure 2 A schematic diagram of a top view of the end plate shown in ;

[0025] Figure 4 yes Figure 3 Schematic diagram of the AA section of the end plate shown in FIG.

[0026] Reference numerals:

[0027] 100. Battery cell;

[0028] 1. Pole group;

[0029] 2. Cover plate; 21. Explosion-proof valve;

[0030] 3. end plate; 31. cavity; 32. partition; 33. through hole;

[0031] 4. Shell; 5. Electrolyte. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] Reference below Figure 1-Figure 4 A battery cell 100 according to an embodiment of the first aspect of the present invention is described.

[0034] like Figure 1 As shown, the battery cell 100 according to the first embodiment of the utility model includes: a housing 4 , a pole group 1 , a cover plate 2 and an end plate 3 .

[0035] Specifically, a housing 4 is formed with a receiving cavity, the electrode group 1 is disposed in the receiving cavity, an explosion-proof valve 21 is disposed on the cover plate 2, the cover plate 2 is disposed at both ends of the electrode group 1 in the length direction, the end plate 3 is disposed between the cover plate 2 and the electrode group 1, the cover plate 2 and the end plate 3 define a cavity 31, the cavity 31 is filled with electrolyte 5, and a partition 32 connected to the end plate 3 is formed in the cavity 31. Therefore, the battery cell 100 has a simple structure and a high safety factor.

[0036] According to the battery cell 100 of the embodiment of the utility model, a partition 32 is formed in the cavity 31 of the end plate 3, so that when the battery cell is shaken, the explosion-proof valve 21 is prevented from cracking and leaking or the valve opening is premature, thereby solving the problem that the electrolyte 5 continuously impacts the explosion-proof valve 21 when the battery cell is shaken, causing the explosion-proof valve 21 to crack and leak or open prematurely, thereby improving the safety factor of the battery cell 100, and the battery cell 100 has a simple structure, which is convenient for assembly and transportation.

[0037] In some embodiments of the present invention, Figure 4 As shown, the partition 32 extends obliquely in a direction away from the cavity 31. Therefore, the oblique extension of the partition 32 can effectively prevent the electrolyte 5 from directly impacting the explosion-proof disk, reducing the risk of the electrolyte 5 impacting the explosion-proof valve 21 and causing the explosion-proof disk to crack.

[0038] In some embodiments of the present invention, Figure 4 As shown, an angle α is formed between the partition plate 32 and the bottom wall of the end plate 3, and the angle α is in the range of 20°-85°. For example, the angle α can be: 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, etc.

[0039] In some embodiments of the present invention, Figure 4 As shown, the separator 32 includes a plurality of separators 32, and the plurality of separators 32 are evenly spaced and arranged along the length direction of the end plate 3. Thus, the plurality of separators 32 ensure that the electrolyte 5 cannot directly impact the explosion-proof valve 21, thereby improving the safety of the battery cell 100.

[0040] In some embodiments of the present invention, multiple partitions 32 divide the cavity 31 into multiple sub-cavities. Thus, the multiple sub-cavities further prevent the electrolyte 5 from directly impacting the explosion-proof valve 21, reduce the impact force of the electrolyte 5, and ensure that the explosion-proof valve 21 will not crack and leak.

[0041] In some embodiments of the present invention, Figure 2As shown, a through hole 33 is formed on the bottom wall of the end plate 3 and penetrates the end plate 3 in the thickness direction of the end plate 3. The through holes 33 include a plurality of through holes 33 arranged in an array. Thus, the through holes 33 are provided so that the gas in the battery cell 100 can flow out of the battery cell 100, thereby ensuring the safety performance of the battery cell 100 and reducing the failure rate of the battery cell 100.

[0042] In some embodiments of the present invention, the explosion-proof valve 21 includes an explosion-proof disk, which is located in the cavity 31. Therefore, the battery cell 100 has a simple structure, a clever design, is easy to produce and assemble, reduces production difficulty, and improves production efficiency.

[0043] In some embodiments of the present invention, the battery cell 100 further includes: an insulating sheet and a side plate, wherein the insulating sheet covers the electrode group 1 and is located between the electrode group 1 and the housing 4, and the side plate is provided on the narrow surface of the electrode group 1 and is located between the electrode group 1 and the insulating sheet. Thus, the overall structural design of the battery cell 100 is ingenious, and the failure rate of the battery cell 100 can be reduced well.

[0044] According to the end plate 3 of the second embodiment of the utility model, Figure 2-Figure 4 As shown, a cavity 31 is formed on the end plate 3 , the cavity 31 is filled with electrolyte 5 , and a plurality of partitions 32 connected to the end plate 3 are formed in the cavity 31 , and the plurality of partitions 32 are evenly spaced along the length direction of the end plate 3 .

[0045] According to the end plate 3 of the embodiment of the utility model, a partition 32 is formed in the cavity 31 of the end plate 3, so that when the battery cell shakes, the explosion-proof valve 21 is prevented from cracking and leaking or the valve opening is premature, thereby solving the problem that the electrolyte 5 continuously impacts the explosion-proof valve 21 when the battery cell shakes, causing the explosion-proof valve 21 to crack and leak or open prematurely, thereby improving the safety factor of the battery cell 100, and the battery cell 100 has a simple structure, which is convenient for assembly and transportation.

[0046] The battery pack according to the third embodiment of the present invention includes a plurality of battery cells 100 according to the first embodiment of the present invention.

[0047] According to the battery pack of the embodiment of the utility model, by providing the battery cell 100 of the first embodiment, 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 improved.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A 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, on which an explosion-proof valve is provided, and the cover plate is arranged at both ends of the pole group in the length direction; The end plate is disposed between the cover plate and the electrode group. The cover plate and the end plate define a cavity filled with electrolyte, and a partition connected to the end plate is formed in the cavity.

2. The battery cell according to claim 1, characterized in that: The partition extends obliquely in a direction away from the cavity.

3. The battery cell according to claim 2, characterized in that: An angle α is formed between the partition plate and the bottom wall of the end plate, and the angle α is in the range of 20°-85°.

4. The battery cell according to claim 3, characterized in that: The partitions include a plurality of partitions, and the plurality of partitions are evenly spaced and arranged along the length direction of the end plate.

5. The battery cell according to claim 4, characterized in that: The plurality of partitions divide the cavity into a plurality of sub-cavities.

6. The battery cell according to any one of claims 1 to 5, characterized in that: A through hole penetrating the end plate in the thickness direction of the end plate is formed on the bottom wall of the end plate, and the through holes include a plurality of through holes arranged in an array.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The explosion-proof valve comprises an explosion-proof disk, and the explosion-proof disk is located in the cavity.

8. The battery cell according to any one of claims 1 to 5, characterized in that: Also includes: An insulating sheet, the insulating sheet covers the electrode group and is located between the electrode group and the shell; A side plate is arranged on a narrow surface of the pole group and is located between the pole group and the insulating sheet.

9. An end plate, characterized in that: A cavity is formed on the end plate, and the cavity is filled with electrolyte. A plurality of partitions connected to the end plate are formed in the cavity, and the plurality of partitions are evenly spaced and arranged along the length direction of the end plate.

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

Images