Battery monomer and battery with same
By setting an explosion-proof valve on the first side wall of the housing of the battery cell and using side plates and protective patches for protection, the problems of shortest exhaust passages and insufficient safety protection in the existing battery cell are solved, and the rapid release of high-temperature gas and the safety of the battery cell are achieved.
Patent Information
- Application Number
- CN202421542803.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The explosion-proof valve of the existing battery cell is arranged on the cover plate, resulting in the shortest exhaust passage and insufficient safety protection, which can easily cause damage to the valve body; when welding the shell, if one side of the weld bead is not handled properly, there will be a risk of scratching the pole set and insulating film of the battery cell.
An explosion-proof valve is arranged on the first side wall of the housing, and the pole group and the explosion-proof valve are isolated through the side plate to protect the explosion-proof valve and reduce the pressure relief path; a protective patch is arranged between the second side wall and the pole group to avoid contact and improve safety.
The rapid release of high-temperature gas and thermoelectric separation are achieved, the safety of the battery cell is improved, and the damage between the electrode group and the explosion-proof valve and the risk of contact between the welding part and the electrode group is avoided.
Smart Images
Figure CN223006928U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery having the same. Background Art
[0002] In the related art, the explosion-proof valve of the battery cell is arranged on the cover plate, and the shortest exhaust passage cannot be realized; moreover, the safety protection at the explosion-proof valve is insufficient, which is likely to cause damage to the valve body. In addition, the housing of the battery cell adopts a welded housing. If one side of the weld bead is not well processed, there is a risk of scratching the electrode group and the insulating film of the battery cell. 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, an object of the utility model is to provide a battery cell, in which the explosion-proof valve is arranged on the first side wall of the housing, so as to reduce the pressure relief path of the battery cell to realize the rapid release of high-temperature gas, and thermoelectric separation can also be realized; the protection patch can prevent the second side wall from contacting the electrode group, thereby improving the safety of the battery cell.
[0004] The utility model also provides a battery having the above battery cell.
[0005] The battery cell according to the first aspect embodiment of the utility model includes: a housing, on the first side wall of which there is an explosion-proof valve; an electrode group arranged in the housing; a side plate arranged in the housing and located between the explosion-proof valve and the electrode group, the side plate including a side plate body and a support protrusion, the support protrusion being connected to the side of the side plate body facing away from the electrode group, and the support protrusion being supported between the first side wall and the side plate body to define an exhaust passage communicating with the explosion-proof valve between the side plate body and the first side wall; and a protection patch arranged between the second side wall of the housing and the electrode group.
[0006] In the battery cell according to the embodiment of the utility model, the explosion-proof valve is arranged on the first side wall of the housing, and the side plate is used to isolate the electrode group from the explosion-proof valve, so as to protect the explosion-proof valve and prevent the electrode group from damaging the explosion-proof valve. When the battery cell has a thermal runaway, the explosion-proof valve can relieve the pressure of the battery cell, reduce the pressure relief path of the battery cell to realize the rapid release of high-temperature gas, and thermoelectric separation can also be realized; a protection patch is arranged between the second side wall and the electrode group, and the protection patch can prevent the second side wall from contacting the electrode group, thereby improving the safety of the battery cell.
[0007] According to some embodiments of the utility model, the side plate body is provided with a through hole communicating the exhaust passage with the electrode group.
[0008] According to some embodiments of the present utility model, there are multiple through holes, and the multiple through holes are arranged in a determinant pattern on the side plate body.
[0009] According to some embodiments of the present utility model, there are two support protrusions, and the two support protrusions are connected to both sides of the side plate body in the width direction.
[0010] According to some embodiments of the present utility model, the distance between the side plate body and the first side wall is L, satisfying: 0.3 mm ≤ L ≤ 1.5 mm.
[0011] According to some embodiments of the present utility model, the side plate is an integrally formed insulating part.
[0012] According to some embodiments of the present utility model, the second side wall has a first wall plate and a second wall plate connected to each other. The first wall plate has a first welding part, the second wall plate has a second welding part, the first welding part is connected to the second welding part, the protection patch has a groove with an opening facing the second side wall, and the groove is used to accommodate part of the first welding part and part of the second welding part.
[0013] According to some embodiments of the present utility model, the thickness of the protection patch is T, satisfying: 0.06 mm ≤ T ≤ 0.2 mm.
[0014] According to some embodiments of the present utility model, the protection patch is an integrally formed insulating part.
[0015] The battery according to the second aspect embodiment of the present utility model includes: a battery cell according to the first aspect embodiment of the present utility model above.
[0016] The battery according to the embodiment of the present utility model, by providing the above battery cell, can reduce the pressure relief path of the battery cell to achieve rapid release of high-temperature gas, and can also achieve thermoelectric separation; the protection patch can prevent the first welding part and the second welding part from rubbing against the electrode group, improving the safety of the battery cell. Furthermore, the safety of the battery can be improved.
[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings
[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:
[0019] Figure 1 is an exploded view of a battery cell according to some embodiments of the present utility model;
[0020] Figure 2 is a side view of a battery cell according to some embodiments of the present utility model;
[0021] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in
[0022] Figure 4 is a top view of a battery cell according to some embodiments of the present utility model;
[0023] Figure 5 is Figure 4 a cross-sectional view taken along line B-B in
[0024] Figure 6 is Figure 5 an enlarged view at C in
[0025] Figure 7 is Figure 5 an enlarged view at D in
[0026] Reference numerals:
[0027] 100, battery cell;
[0028] 10, housing; 11, first side wall; 12, second side wall; 121, first wall plate; 1211, first welding portion; 122, second wall plate; 1221, second welding portion; 123, mounting hole; 124, mounting groove; 13, third side wall; 14, fourth side wall;
[0029] 20, side plate; 21, side plate body; 211, through hole; 22, support protrusion; 23, exhaust passage;
[0030] 30, protection patch; 31, groove;
[0031] 41, electrode assembly; 42, explosion-proof valve; 43, cover plate; 431, pole column; 44, insulating film. Detailed implementation manners
[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.
[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. 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. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.
[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0035] Next, reference is made to Figures 1 - 7 Describe the battery cell 100 according to an embodiment of the present utility model.
[0036] The battery cell 100 according to the first aspect embodiment of the present utility model, the battery cell 100 includes a housing 10. The housing 10 is formed by connecting the head and tail of a whole shell. The housing 10 includes a first side wall 11, a third side wall 13, a second side wall 12, and a fourth side wall 14 that are connected in sequence. The welding portion of the housing 10 is provided on the second side wall 12. The fixed connection of the housing 10 adopts technologies such as laser and high-frequency welding. Compared with the processes such as stretching and extrusion in the related art, the process for producing the housing 10 adopted in the present application has lower costs.
[0037] The battery cell 100 includes a protective patch 30, which is arranged between the second side wall 12 of the shell 10 and the pole group 41. The second side wall 12 has a welding portion of the shell 10. The protective patch 30 is used to separate the second side wall 12 of the shell 10 from the pole group 41 to prevent the welding portion from scratching the pole group 41 and causing damage to the pole group 41. The outer peripheral side of the pole group 41 is coated with an insulating film 44, and a protective patch 30 is arranged between the second side wall 12 of the shell 10 and the insulating film 44, which can play a double protection role for the pole group 41. The protective patch 30 can be attached to the inner wall surface of the second side wall 12 by adhesive; in the production and processing stage, one end of the protective patch 30 is attached to the edge of one side of the shell 10, and when assembling the battery cell 100, the other end of the protective patch 30 is attached to the edge of the other side of the shell 10, which can make the process simple and convenient for automated production.
[0038] The battery cell 100 further includes an electrode group 41 and a side plate 20. The electrode group 41 is disposed in the housing 10. An explosion-proof valve 42 is provided on the first side wall 11. A mounting hole 123 is provided on the first side wall 11. The explosion-proof valve 42 is mounted on the inner wall surface of the second side wall 12 and is communicated with the mounting hole 123. For example, the first side wall 11 is convex toward the side away from the electrode group 41 to form a mounting groove 124 on the inner wall of the first side wall 11. The explosion-proof valve 42 is located in the mounting groove 124, so that the explosion-proof valve 42 does not occupy the space in the housing 10. The mounting hole 123 passes through the bottom wall of the mounting groove 124.
[0039] The side plate 20 is disposed in the housing 10 and is located between the explosion-proof valve 42 and the pole group 41. The side plate 20 is used to isolate the pole group 41 from the explosion-proof valve 42, and can protect the explosion-proof valve 42 to prevent the pole group 41 from damaging the explosion-proof valve 42, so as to improve the safety of the battery cell 100. The side plate 20 includes a side plate body 21 and a support protrusion 22. The support protrusion 22 is connected to the side of the side plate body 21 away from the pole group 41. The support protrusion 22 is supported between the first side wall 11 and the side plate body 21 to define an exhaust channel 23 connected to the explosion-proof valve 42 between the side plate body 21 and the first side wall 11. When the battery cell 100 has thermal runaway, the high-temperature gas can be discharged into the exhaust channel 23 and released to the external environment through the explosion-proof valve 42 connected to the exhaust channel 23.
[0040] The battery cell 100 further includes a cover plate 43 disposed on one side of the housing 10, and a terminal post 431 is provided on the cover plate 43. In the related art, the explosion-proof valve 42 is disposed on the cover plate 43. When the battery cell 100 undergoes thermal runaway, the high-temperature gas inside the battery cell 100 is depressurized through the explosion-proof valve 42 disposed on the cover plate 43, and the depressurization path of the battery cell 100 is relatively long; furthermore, both the explosion-proof valve 42 and the terminal post 431 are located on the cover plate 43, and when the explosion-proof valve 42 is depressurized, thermoelectric separation cannot be achieved. In this application, the explosion-proof valve 42 is disposed on the first side wall 11 of the housing 10. When the battery cell 100 undergoes thermal runaway, the explosion-proof valve 42 can depressurize the battery cell 100, which can reduce the depressurization path of the battery cell 100 to achieve rapid release of the high-temperature gas; and the explosion-proof valve 42 is disposed on the first side wall 11, and the terminal post 431 is located on the cover plate 43, which can also achieve thermoelectric separation and improve the safety of the battery cell 100.
[0041] For the battery cell 100 according to an embodiment of the present utility model, the explosion-proof valve 42 is disposed on the first side wall 11 of the housing 10, and the side plate 20 is used to isolate the electrode group 41 and the explosion-proof valve 42, which can protect the explosion-proof valve 42 and prevent the electrode group 41 from damaging the explosion-proof valve 42. When the battery cell 100 undergoes thermal runaway, the explosion-proof valve 42 can depressurize the battery cell 100, which can reduce the depressurization path of the battery cell 100 to achieve rapid release of the high-temperature gas, and can also achieve thermoelectric separation; a protective patch 30 is disposed between the second side wall 12 and the electrode group 41, and the protective patch 30 can prevent the housing 10 from contacting the electrode group 41, thereby improving the safety of the battery cell 100.
[0042] According to some embodiments of the present utility model, referring to Figure 1 、 Figures 5 - 6 , the side plate body 21 has a through hole 211 communicating the exhaust passage 23 and the electrode group 41. When the battery cell 100 undergoes thermal runaway, the high-temperature gas in the electrode group 41 can enter the exhaust passage 23 through the through hole 211, so as to achieve rapid depressurization of the battery cell 100.
[0043] According to some embodiments of the present utility model, referring to Figure 1 、 Figures 5 - 6 , there are a plurality of through holes 211, and the plurality of through holes 211 are arranged in a row on the side plate body 21. When the battery cell 100 undergoes thermal runaway, the plurality of through holes 211 can increase the rate at which the high-temperature gas in the electrode group 41 is transferred into the exhaust passage 23. When the battery cell 100 undergoes thermal runaway, it may be that a certain position of the electrode group 41 undergoes thermal runaway, and the high-temperature gas in the electrode group 41 can be discharged into the exhaust passage 23 through the adjacent through hole 211, which can further reduce the depressurization path of the battery cell 100.
[0044] For example, a plurality of through holes 211 are arranged in a three-row and ten-column pattern on the side plate body 21. The number and arrangement of the through holes 211 provided on the side plate body 21 can be designed according to actual situations.
[0045] According to some embodiments of the present invention, referring to Figure 1 , Figures 5 - 6 , the support protrusions 22 have two. The two support protrusions 22 are connected to both sides of the side plate body 21 in the width direction. The support protrusions 22 extend along the length direction of the side plate body 21, so that the length of the support protrusions 22 is longer, the reliability of the support is increased, the support effect is improved, and the blockage of the exhaust passage 23 caused by the contact between the electrode group 41 and the first side wall 11 is avoided, so that the exhaust is smooth, and the safety of the battery cell 100 is further improved.
[0046] According to some embodiments of the present invention, referring to Figure 1 , Figures 5 - 6 , the distance between the side plate body 21 and the first side wall 11 is L, satisfying: 0.3 mm ≤ L ≤ 1.5 mm, that is, the height of the exhaust passage 23 is between 0.3 mm and 1.5 mm. For example, the distance between the side plate body 21 and the first side wall 11 can be 0.3 mm, 0.5 mm, 0.9 mm, 1.2 mm or 1.5 mm, etc.
[0047] Setting the height of the exhaust passage 23 between 0.3 mm and 1.5 mm can not only meet the transfer rate of high-temperature gas in the exhaust passage 23, but also reduce the space occupied by the exhaust passage 23 in the housing 10, which is beneficial to the improvement of the capacity of the electrode group 41.
[0048] According to some embodiments of the present invention, referring to Figure 1 , Figures 5 - 6 , the side plate 20 is an integrally formed insulating part, which can simplify the processing technology of the side plate 20 and improve the structural strength of the side plate 20, making the structure of the side plate 20 stable. The side plate 20 is an insulating part and has an insulating function to prevent short circuit caused by the contact between the electrode group 41 and the first side wall 11 through the side plate 20.
[0049] According to some embodiments of the present invention, referring to Figure 1 , Figure 5 , Figure 7 , the second side wall 12 has a first wall plate 121 and a second wall plate 122 connected to each other. The first wall plate 121 has a first welding part 1211, and the second wall plate 122 has a second welding part 1221. The first welding part 1211 is connected to the second welding part 1221. By welding the first welding part 1211 and the second welding part 1221, the head and tail of the housing 10 can be connected.
[0050] The protective patch 30 has a groove 31 with an opening facing the second side wall 12. The groove 31 is used to accommodate part of the first welding portion 1211 and part of the second welding portion 1221. The protective patch 30 can cover the weld between the first welding portion 1211 and the second welding portion 1221, reducing the probability of the weld between the first welding portion 1211 and the second welding portion 1221 coming into contact with the electrode group 41, thereby reducing the risk of the first welding portion 1211 and the second welding portion 1221 rubbing against the electrode group 41 and improving the safety of the battery cell 100. For example, the above-mentioned welding portions include the first welding portion 1211 and the second welding portion 1221.
[0051] According to some embodiments of the present invention, referring to Figure 1 , Figure 5 , Figure 7 , the thickness of the protective patch 30 is T, satisfying: 0.06 mm ≤ T ≤ 0.2 mm. For example, the thickness of the protective patch 30 can be 0.06 mm, 0.08 mm, 0.12 mm, 0.15 mm or 0.2 mm, etc. When the thickness of the protective patch 30 satisfies the above range, the protective patch 30 covers the first welding portion 1211 and the second welding portion 1221 while minimizing the space occupied in the housing 10, which is beneficial to the increase of the capacity of the electrode group 41.
[0052] In a specific example, the distance between the edge of the protective patch 30 and the third side wall 13 is W, and the distance between the edge of the protective patch 30 and the fourth side wall 14 is also W, satisfying: 1.0 mm ≤ W ≤ 4.0 mm. For example, the distance between the edge of the protective patch 30 and the third side wall 13, and the distance between the edge of the protective patch 30 and the fourth side wall 14 can both be 1.0 mm, 1.5 mm, 2.5 mm, 3.0 mm or 4.0 mm, etc. When the distances between the edge of the protective patch 30 and the third side wall 13 and the fourth side wall 14 satisfy the above range, the probability of interference between the protective patch 30 and the third side wall 13 and the fourth side wall 14 is reduced, facilitating the assembly of the protective patch 30.
[0053] According to some embodiments of the present invention, referring to Figure 1 , Figure 5 , Figure 7 , the protective patch 30 is an integrally formed insulating part, which can simplify the processing technology of the protective patch 30 and improve the structural strength of the protective patch 30. The protective patch 30 is an insulating part and has an insulating function, preventing the electrode group 41 from contacting the housing 10 through the protective patch 30 and causing a short circuit.
[0054] The battery according to the second aspect embodiment of the present invention includes: the battery cell 100 according to the above first aspect embodiment of the present invention.
[0055] According to the battery of the embodiment of the present utility model, by providing the above battery cell 100, the pressure relief path of the battery cell 100 can be reduced to achieve rapid release of high-temperature gas, and thermoelectric separation can also be achieved; the protective patch 30 can prevent the first welding part 1211 and the second welding part 1221 from rubbing against the electrode group 41, improving the safety of the battery cell 100. Thus, the safety of the battery can be improved.
[0056] In the description of this specification, the description with reference to terms such as "some embodiments", "optionally", "further", 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.
[0057] 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. 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 shell, wherein a first side wall of the shell is provided with an explosion-proof valve; A pole group, the pole group is arranged in the shell; A side plate, the side plate is arranged in the housing and between the explosion-proof valve and the electrode group, the side plate comprises a side plate body and a support protrusion, the support protrusion is connected to a side of the side plate body away from the electrode group, the support protrusion is supported between the first side wall and the side plate body, so as to define an exhaust passage communicating with the explosion-proof valve between the side plate body and the first side wall; A protective patch is arranged between the second side wall of the shell and the pole group.
2. The battery cell according to claim 1, characterized in that: The side plate body is provided with a through hole connecting the exhaust channel and the pole group.
3. The battery cell according to claim 2, characterized in that: There are a plurality of through holes, and the plurality of through holes are arranged in a matrix on the side plate body.
4. The battery cell according to claim 1, characterized in that: There are two supporting protrusions, and the two supporting protrusions are connected to both sides of the side plate body in the width direction.
5. The battery cell according to claim 1, characterized in that: The distance between the side plate body and the first side wall is L, which satisfies: 0.3mm≤L≤1.5mm.
6. The battery cell according to claim 1, characterized in that: The side plate is an integrally formed insulating member.
7. The battery cell according to claim 1, characterized in that: The second side wall has a first wall plate and a second wall plate connected to each other, the first wall plate has a first welding portion, the second wall plate has a second welding portion, the first welding portion is connected to the second welding portion, and the protective patch has a groove with an opening toward the second side wall, and the groove is used to accommodate part of the first welding portion and part of the second welding portion.
8. The battery cell according to claim 1, characterized in that: The thickness of the protective patch is T, which satisfies: 0.06mm≤T≤0.2mm.
9. The battery cell according to claim 1, characterized in that: The protective patch is an integrally formed insulating piece.
10. A battery, characterized in that: include: The battery cell according to any one of claims 1 to 9.