Pole group end plate, battery cell and battery pack

Abstract

The utility model provides a pole group end plate, a battery cell and a battery pack, the pole group end plate is arranged between a battery cell cover plate and a pole group body, the pole group end plate comprises an end plate body, the end plate body is provided with a first abutting boss protruding towards one side where the pole group body is located, a cavity is formed in the first abutting boss, and the end plate body is provided with a second abutting boss protruding towards the other side where the pole group body is located. A through hole communicated with the cavity is formed in the first abutting boss, the two sides of the end plate body in the thickness direction are communicated through the through hole and the cavity, and the cavity corresponds to an anti-explosion valve on the battery cell cover plate; the first abutting boss is provided with a partition structure, the partition structure divides the cavity into a plurality of sub-cavities, and when the anti-explosion valve is arranged at the bottom of the battery cell cover plate, the sub-cavities can weaken the impact force of electrolyte on the anti-explosion valve. According to the pole group end plate disclosed by the utility model, the force of the electrolyte for impacting the explosion-proof valve can be weakened through the plurality of sub-cavities, so that the cracking, liquid leakage and advanced valve opening of the explosion-proof valve caused by the fact that the electrolyte continuously impacts the explosion-proof valve due to the shaking of the battery cell can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery components, and in particular to a pole group end plate. The utility model also relates to a battery cell provided with the pole group end plate. At the same time, the utility model also relates to a battery pack provided with the battery cell. Background Art

[0002] At present, the structure of blade cells mainly includes: cover plate (with integrated pole, explosion-proof valve, upper plastic, lower plastic, injection hole), shell, pole group end plate, side plate, bare cell insulation sheet, pole group, etc. Among them, after the cover plate and the shell are welded, a closed space with a certain mechanical strength is formed to protect the pole group; the side plate and the bare cell insulation sheet are welded and fixed to the outside of the pole group; the bare cell insulation sheet and the plastic parts of the positive and negative pole cover plates are melted and fixed, so that the pole group is well fixed in the shell to avoid short circuit of the pole group. There is a ventilation space opposite the explosion-proof valve on the cover plate, and no other structures can block it. Usually, the ventilation space is mainly formed by the explosion-proof valve, the plastic under the cover plate, and the pole group end plate enclosure; the pole group end plate is pressed against the end of the pole group, and sufficient cavity needs to be designed on the pole group end plate for gas to pass through.

[0003] However, when the explosion-proof valve on the cover is arranged at the lower end of the cover, the electrolyte will accumulate in the cavity due to the formation of a cavity between the electrode group end plate in the blade battery cell and the explosion-proof valve; when the battery is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve, which can easily cause the explosion-proof valve to be damaged, the battery cell to leak, and the explosion-proof valve to open prematurely. Utility Model Content

[0004] In view of this, the utility model aims to provide an electrode group end plate, so as to effectively prevent the impact of the electrolyte on the explosion-proof valve.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A pole group end plate, arranged between a cell cover plate and a pole group body, the pole group end plate comprising an end plate body, the end plate body being provided with a first abutting boss protruding toward the side where the pole group body is located, a cavity being formed in the first abutting boss, and a through hole communicating with the cavity being provided on the first abutting boss, the through hole and the cavity communicating with both sides of the end plate body in a thickness direction, the cavity being arranged correspondingly to the explosion-proof valve on the cell cover plate;

[0007] A partition structure is provided on the first abutting boss, and the partition structure divides the cavity into a plurality of sub-cavities. When the explosion-proof valve is arranged at the bottom of the battery cover, each sub-cavity can weaken the impact force of the electrolyte on the explosion-proof valve.

[0008] Furthermore, the first abutment boss is open on one side facing the explosion-proof valve, and the through hole includes a plurality of first through holes provided on the first abutment boss on the side facing the pole group body; the partition structure includes a plurality of first partitions and a plurality of second partitions provided in the cavity, and the plurality of the first partitions and the plurality of the second partitions are interwoven and connected to form a plurality of the sub-cavities, and the plurality of the sub-cavities are connected to the plurality of the first through holes in a one-to-one correspondence.

[0009] Furthermore, in the longitudinal section of the end plate body, the length of the cavity is M, the width is N, and the area is S. The length of each sub-cavity is m, the width is n, and the area is s1. Each sub-cavity satisfies: s1 / S=0.15~0.25, n / N≤0.5, m / M≤0.5, and m and n are not less than 1 mm.

[0010] Furthermore, the partition structure includes a mesh plate provided on the first abutment boss facing the explosion-proof valve, and the cavity is formed between the mesh plate and the abutment boss; the through holes include a plurality of second through holes provided on the first abutment boss facing the pole group body, and a plurality of third through holes provided on the mesh plate; in the projection on the longitudinal section of the end plate body, the plurality of second through holes and the plurality of third through holes are staggeredly arranged.

[0011] Further, the side of the first abutting boss is provided with a side through hole connected to the cavity, and the side through hole is used to allow the gas inside the power core to pass through; and / or the grid plate is integrally formed with the end plate body.

[0012] Furthermore, in the longitudinal section of the end plate body, the length of the cavity is A, the width is B, and the area is S; the second through hole is a rectangular hole, and the length of the second through hole is a, the width is b, and the area is s2; the cavity and the second through hole satisfy: s2 / S=0.05~0.25, 0.4≤a≤3mm, and 0.4≤b≤3mm.

[0013] Furthermore, the second through hole and the third through hole have the same structure.

[0014] Furthermore, a second abutment boss is provided at one end of the end plate body away from the first abutment boss, and a through hole is provided on the second abutment boss, and the through hole penetrates the second abutment boss along the direction from the pole group body to the battery cover plate.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The pole group end plate described in the utility model divides the cavity in the first abutment boss into a plurality of sub-cavities through the first abutment boss arranged on the end plate body and the partition structure arranged in the first abutment boss. Therefore, when the explosion-proof valve is arranged at the bottom position of the battery cell cover plate, each sub-cavity can weaken the force of the electrolyte impacting the explosion-proof valve, thereby achieving the effect of protecting the explosion-proof valve, thereby effectively preventing the explosion-proof valve from cracking and leaking and opening the valve prematurely due to the continuous impact of the electrolyte on the explosion-proof valve caused by the shaking of the battery cell, and has a very good use effect.

[0017] In addition, the first abutting boss is open on one side facing the explosion-proof valve, and the partition structure uses a first partition plate and a second partition plate that are interwoven and connected, which not only facilitates the formation of multiple sub-cavities, but also has the characteristics of simple structure and easy design and implementation. The limitation of the relevant dimensions of each sub-cavity enables each sub-cavity to further weaken the force of the electrolyte impacting the explosion-proof valve.

[0018] Secondly, the partition structure adopts a mesh plate, and the mesh plate and the first abutting boss form a cavity, and the second through hole and the third through hole are respectively arranged on the opposite surface of the first abutting boss and the mesh plate. At the same time, the second through hole and the third through hole are staggered, which can also form a sub-cavity between the second through hole and the third through hole. At this time, the electrolyte flow path between the second through hole and the third through hole becomes longer, and the electrolyte flow rate can be slowed down, weakening the impact of the electrolyte on the explosion-proof valve. It also has the characteristics of simple structure and easy processing and manufacturing.

[0019] In addition, the limitation of the size of the second through hole and the limitation of the structure of the third through hole can further improve the weakening force of the electrolyte, that is, further improve the protection of the explosion-proof valve. The side through hole set on the side of the first abutment boss can facilitate the timely passage of the gas inside the battery cell, which is beneficial to ensure the pressure balance inside and outside the battery cell. The second abutment boss is set, which cooperates with the first abutment boss to better abut the pole group body, and can ensure the stability of the pole group body installed in the shell.

[0020] Another object of the present invention is to provide a battery cell, in which the electrode group end plate as described above is provided.

[0021] Another object of the present invention is to provide a battery pack, wherein the battery pack is provided with the battery cell as described above.

[0022] The battery cell and battery pack of the present invention have the same beneficial effects as the electrode group end plate described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 A first perspective view of a first exemplary structure of a pole group end plate according to an embodiment of the present utility model;

[0025] Figure 2 A second perspective view of a first exemplary structure of a pole group end plate according to an embodiment of the present utility model;

[0026] Figure 3 A first perspective view of a second exemplary structure of a pole group end plate according to an embodiment of the present utility model;

[0027] Figure 4 A second perspective view of a second exemplary structure of a pole group end plate according to an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 EE section view in the figure;

[0029] Description of reference numerals:

[0030] 1. End plate body; 101. First abutting boss; 102. Second abutting boss; 103. Grid plate; 104. Side through hole; 1011. First partition plate; 1012. Second partition plate; 1013. First through hole; 1014. Second through hole; 1031. Third through hole; 1021. Through hole; 10. Sub-cavity. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] Embodiment 1

[0036] This embodiment relates to an electrode group end plate, which is sandwiched between the battery cell cover and the electrode group body. Figures 1 to 5 As shown, the pole group end plate mainly includes an end plate body 1, on which a first abutment boss 101 protruding toward the side where the pole group body is located is provided, a cavity is formed in the first abutment boss 101, and a through hole connecting the cavity is provided on the first abutment boss 101, the through hole and the cavity connect the two sides of the end plate body in the thickness direction, and the cavity is arranged correspondingly to the explosion-proof valve on the battery cover.

[0037] At the same time, a partition structure is provided on the first abutting boss 101, which divides the cavity into a plurality of sub-cavities 10. When the explosion-proof valve is arranged at the bottom of the battery cover, each sub-cavity 10 can weaken the impact force of the electrolyte on the explosion-proof valve.

[0038] At this time, by providing a partition structure in the first abutting boss 101 on the end plate body 1, the cavity in the first abutting boss 101 is divided into a plurality of sub-cavities 10. Therefore, when the explosion-proof valve is arranged at the bottom of the battery cover, each sub-cavity 10 can weaken the force of the electrolyte impacting the explosion-proof valve, thereby protecting the explosion-proof valve, thereby effectively preventing the explosion-proof valve from cracking and leaking and premature opening due to the continuous impact of the electrolyte on the explosion-proof valve caused by the shaking of the battery cell.

[0039] Based on the above overall introduction, specifically, as an exemplary structure, Figure 1 and Figure 2As shown, a first abutting boss 101 is provided on the end plate body 1, and the first abutting boss 101 protrudes toward the side where the pole group body is located, and the side of the first abutting boss 101 facing the explosion-proof valve is open. The above-mentioned through holes include a plurality of first through holes 1013 arranged on the side of the first abutting boss 101 facing the pole group body. At this time, the plurality of first through holes 1013 and the open cavity connect the two sides of the end plate body 1 in the thickness direction. The partition structure includes a plurality of first partitions 1011 and a second partition 1012 arranged in the cavity. The plurality of first partitions 1011 and the plurality of second partitions 1012 are interwoven and connected to form a plurality of sub-cavities 10, and the plurality of sub-cavities 10 are connected with the plurality of first through holes 1013 one by one.

[0040] The first partition 1011 and the second partition 1012 are interlaced horizontally and vertically, and divide the cavity into a plurality of sub-cavities 10, each of which has a rectangular cross section. At this time, the arrangement of the first partition 1011 and the second partition 1012 not only facilitates the molding of the plurality of sub-cavities 10, but also has the characteristics of simple structure and easy design and implementation.

[0041] As a preferred embodiment, still refer to Figure 1 and Figure 2 As shown, in the longitudinal section of the end plate body 1, the length of the cavity is A, the width is B, and the area is S. The length of each sub-cavity 10 is m, the width is n, and the area is s1. Each sub-cavity 10 satisfies: s1 / S = 0.15-0.25, n / N≤0.5, m / M≤0.5, and m and n are not less than 1 mm. The limitation of the relevant dimensions of each sub-cavity 10 enables each sub-cavity to further weaken the force of the electrolyte impacting the explosion-proof valve. In specific implementation, the ratio of s1 / S can be set to 0.15, 0.18, 0.20, 0.22 or 0.25, etc.

[0042] In addition, as another exemplary structure, Figures 3 to 5 As shown, the structure of the electrode group end plate is substantially the same as the electrode group end plate structure mentioned above, except that the formation structure of each sub-cavity 10 is different. Figures 3 to 5 As shown, the grid plate 103 on the side of the first abutting boss 101 facing the explosion-proof valve, and a cavity is formed between the grid plate 103 and the abutting platform. The through holes include a plurality of second through holes 1014 provided on the side of the first abutting boss 101 facing the pole group body, and a plurality of third through holes 1031 provided on the grid plate 103. And in the projection on the longitudinal section of the end plate body 1, the plurality of second through holes 1014 and the plurality of third through holes 1031 are arranged in a staggered manner. At this time, the plurality of second through holes 1014 and the plurality of third through holes 1031 and the cavity connect the two sides of the end plate body 1 in the thickness direction.

[0043] Among them, the arrangement of the grid plate 103 and the plurality of second through holes 1014 and the plurality of third through holes 1031 constitutes the above-mentioned partition structure, and the sub-cavity 10 is formed between the second through hole 1014 and the third through hole 1031. At this time, the staggered arrangement of the grid plate 103 and the second through hole 1014 and the third through hole 1031 makes the electrolyte flow path between the second through hole 1014 and the third through hole 1031 longer, which can slow down the electrolyte flow rate and weaken the impact force of the electrolyte on the explosion-proof valve. Moreover, it also has the characteristics of simple structure and easy processing and manufacturing.

[0044] As a preferred embodiment, in this embodiment, the second through hole 1014 and the third through hole 1031 have the same structure, that is, they are both rectangular long holes. In the longitudinal section of the end plate body 1, the length of the cavity is A, the width is B, and the area is S. The second through hole 1014 is a rectangular hole, and the length of the second through hole 1014 is a, the width is b, and the area is s2. The cavity and the second through hole 1014 satisfy: s2 / S = 0.05-0.25, 0.4≤a≤3mm, and 0.4≤b≤3mm. This setting can further improve the weakening of the electrolyte, that is, it can further improve the protection of the explosion-proof valve. In specific implementation, the ratio of s1 / S can be set to 0.05, 0.10, 0.15, 0.18, 0.20, 0.22 or 0.25, etc.

[0045] Here, it is worth noting that in this embodiment, the grid plate 103 is integrally formed with the end plate body 1, which is convenient for the processing and preparation of the electrode group end plate. Of course, it is understandable that the grid plate 103 can also be connected to the end plate body 1 by means of clamping, bonding or screwing.

[0046] As a preferred embodiment, in this embodiment, a side through hole 104 communicating with the cavity is also provided on the side of the first abutting boss 101, and the side through hole 104 is used to allow the gas inside the power core to pass through. Figure 3 As shown, side through holes 104 are provided on three sides of the first abutting boss 101 , and each side through hole 104 is connected to the cavity.

[0047] In addition, in this embodiment, a second abutting boss 102 is also provided at one end of the end plate body 1 away from the first abutting boss 101, and a through hole 1021 is provided on the second abutting boss 102, and the through hole 1021 penetrates the second abutting boss 102 along the direction from the pole group body to the cell cover plate. The second abutting boss 102 and the first abutting boss 101 are respectively provided at both ends of the end plate body 1, so that the pole group body can be better abutted by the cooperation of the second abutting boss 102 and the first abutting boss 101, and the stability of the pole group body installed in the housing can be ensured.

[0048] Embodiment 2

[0049] The present embodiment relates to a battery cell, in which the electrode group end plate of the first embodiment is provided. The battery cell of the present embodiment adopts the electrode group end plate of the first embodiment, so as to prevent the explosion-proof valve from cracking and leaking and premature opening of the valve due to the continuous impact of electrolyte on the explosion-proof valve caused by the shaking of the battery cell, thereby improving the safety of the battery cell.

[0050] At the same time, this embodiment also relates to a battery pack, in which the above-mentioned battery cell is provided. By adopting the above-mentioned battery cell, the battery pack of this embodiment can also prevent the explosion-proof valve from cracking and leaking and opening the valve in advance due to the continuous impact of electrolyte on the explosion-proof valve caused by the shaking of the battery cell, thereby improving the service life of the battery pack.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrode group end plate, arranged between a cell cover plate and an electrode group body, characterized in that: The electrode group end plate comprises an end plate body, the end plate body is provided with a first abutting boss protruding toward the side where the electrode group body is located, a cavity is formed in the first abutting boss, and a through hole connected to the cavity is provided on the first abutting boss, the through hole and the cavity connect the two sides of the end plate body in the thickness direction, and the cavity is arranged corresponding to the explosion-proof valve on the battery cover plate; A partition structure is provided on the first abutting boss, and the partition structure divides the cavity into a plurality of sub-cavities. When the explosion-proof valve is arranged at the bottom of the battery cover, each sub-cavity can weaken the impact force of the electrolyte on the explosion-proof valve.

2. The pole group end plate according to claim 1, characterized in that: The first abutting boss has a side facing the explosion-proof valve that is open, and the through hole includes a plurality of first through holes that are provided on the first abutting boss and face the pole group body. The partition structure includes a plurality of first partitions and a plurality of second partitions disposed in the cavity. The plurality of first partitions and the plurality of second partitions are interwoven and connected to form a plurality of sub-cavities. The plurality of sub-cavities are connected to the plurality of first through holes in a one-to-one correspondence.

3. The pole group end plate according to claim 2, characterized in that: In the longitudinal section of the end plate body, the length of the cavity is M, the width is N, and the area is S. The length of each sub-cavity is m, the width is n, and the area is s1. Each sub-cavity satisfies: s1 / S=0.15~0.25, n / N≤0.5, m / M≤0.5, and m and n are not less than 1 mm.

4. The pole group end plate according to claim 1, characterized in that: The partition structure comprises a mesh plate disposed on the first abutting boss and facing the explosion-proof valve, wherein the cavity is formed between the mesh plate and the first abutting boss; The through holes include a plurality of second through holes provided on the first abutting boss facing the pole group body, and a plurality of third through holes provided on the grid plate; In the projection on the longitudinal section of the end plate body, the plurality of second through holes and the plurality of third through holes are staggeredly arranged.

5. The pole group end plate according to claim 4, characterized in that: A side through hole communicating with the cavity is provided on the side of the first abutting boss, and the side through hole is used to allow gas inside the power core to pass through; and / or, The grid plate and the end plate body are integrally formed.

6. The pole group end plate according to claim 4, characterized in that: In the longitudinal section of the end plate body, the length of the cavity is A, the width is B, and the area is S. The second through hole is a rectangular hole, and the length of the second through hole is a, the width is b, and the area is s2. The cavity and the second through hole satisfy: s2 / S=0.05~0.25, 0.4≤a≤3mm, and 0.4≤b≤3mm.

7. The pole group end plate according to claim 6, characterized in that: The second through hole and the third through hole have the same structure.

8. The pole group end plate according to any one of claims 1 to 7, characterized in that: A second abutment boss is provided at one end of the end plate body away from the first abutment boss, and a through hole is provided on the second abutment boss. The through hole penetrates the second abutment boss along the direction from the pole group body to the cell cover plate.

9. A battery cell, characterized in that: The battery cell is provided with a pole group end plate according to any one of claims 1 to 8.

10. A battery pack, characterized in that: The battery pack is provided with the battery cell described in claim 9.

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