BATTERY CELL, BATTERY PACK AND VEHICLE

Abstract

A battery cell (100) comprises a housing (10), an electrode core (20), and a venting element (30). A liquid injection port (13) is provided in the housing (10). The venting element (30) is located within the housing (10) and is situated between the electrode core (20) and an inner side wall of the housing (10). The venting element (30) is provided with a first venting port (32) and a second venting port (33) extending through it, as well as a venting chamber (34) that communicates with the first venting port (32) and the second venting port (33).

Description

CROSS-REFERENCE TO RELATED REGISTRATIONS

[0001] This application claims the priority and benefits of patent application No. 202311162742X, which was filed with the Chinese Intellectual Property Administration on September 11, 2023, and is hereby incorporated in its entirety by reference. TECHNICAL AREA

[0002] The present invention relates to the field of battery technologies, in particular a battery cell, a battery pack and a vehicle. BACKGROUND

[0003] A lithium-ion battery is a common type of battery in which a certain amount of gas enters or is generated within the battery during the injection and formation of an electrolyte solution. If the airflow inside the battery is not uniform, it is difficult to effectively remove the gas during the vacuum extraction process of the lithium-ion battery, which affects the uniformity of the internal pressure and the electrochemical performance of the battery. SUMMARY

[0004] Embodiments of the present invention provide a battery cell, a battery pack and a vehicle to solve at least one of the aforementioned technical problems.

[0005] A battery cell in embodiments of the present invention comprises: a housing, wherein a receiving chamber is formed in the housing and a liquid injection opening connected to the receiving chamber is provided in the housing; an electrode core, wherein the electrode core is housed in the receiving chamber; and a venting element, wherein the venting element is located in the receiving chamber and is situated between the electrode core and a side wall of the receiving chamber, the venting element is provided with a first venting opening, a venting chamber and a second venting opening, and the venting chamber is connected to the receiving chamber via the first venting opening and to the liquid injection opening via the second venting opening.

[0006] In the aforementioned battery cell, by providing the venting element, gas that penetrates and / or is generated in the electrode core can pass through the first vent opening into the vent chamber and, via the vent chamber and the second vent opening, reach the liquid injection opening in order to effectively remove the gas in the battery cell during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell.

[0007] In some embodiments, the housing comprises two first cover plates arranged in a first direction and a frame body connected in a first direction to the two first cover plates, the liquid injection port is arranged in one of the first cover plates, the battery cell comprises an explosion protection valve, the explosion protection valve is arranged on the other first cover plate, and the venting element is located between the electrode core and an inner surface of the frame body.

[0008] In some embodiments, a ratio of the length of the venting element to the length of the receiving space in the first direction is selected from the range [50%, 100%].

[0009] In some embodiments, a ratio of the height of the venting element to the height of the receiving space in a second direction is selected from the range [0.1%, 10%].

[0010] In some embodiments, a ratio of the width of the venting element to the width of the receiving space in a third direction is selected from the range [50%, 100%].

[0011] In some embodiments, the housing includes a second cover plate, the battery cell includes an explosion protection valve, both the liquid injection port and the explosion protection valve are arranged on the second cover plate, and the venting element is located between the electrode core and the second cover plate.

[0012] In some embodiments, a third vent opening is provided in the venting element, which is connected to the venting chamber, and the third vent opening is connected to the first vent opening in a thickness direction of the venting element accordingly.

[0013] In some embodiments, a support element is provided in the ventilation space, and the support element is connected to at least two opposite side walls of the ventilation space.

[0014] In some embodiments, the cross-section of the venting space has the shape of a rectangle, and two support elements are connected crosswise to each other and each connected to two pairs of opposite corners of the rectangle.

[0015] In some embodiments, the battery cell includes a lyophobic layer arranged on a side wall of the venting chamber.

[0016] A battery pack in one embodiment of the present invention comprises the battery cell described in one of the preceding embodiments.

[0017] In the aforementioned battery pack, by providing the venting element, gas that penetrates and / or is generated in the electrode core can pass through the first vent opening into the vent chamber and, via the vent chamber and the second vent opening, reach the liquid injection opening in order to effectively remove the gas in the battery cell during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell.

[0018] A vehicle in one embodiment of the present invention comprises the battery pack described in the preceding embodiment.

[0019] In the vehicle described above, by providing the venting element, gas that penetrates and / or is generated in the electrode core can enter the vent chamber through the first vent opening and reach the liquid injection opening via the vent chamber and the second vent opening in order to effectively remove the gas in the battery cell during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell.

[0020] Some of the further aspects and advantages of the present invention are set out in the following description, and some will be evident from the following description or will result from the practical application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The foregoing and / or further aspects and advantages of the present invention will become apparent and easily understandable from the description of the embodiments with reference to the following accompanying drawings, wherein: Fig. 1 a schematic representation of a structure of a battery cell according to an embodiment of the present invention; Fig. 2 an enlarged view of part A in Fig. 1 is; Fig. 3 a schematic representation of a structure of a venting element according to an embodiment of the present invention; Fig. 4 an enlarged view of part B in Fig. 3 is; Fig. 5 a cross-sectional view of the battery cell along line CC in Fig. 1 is; Fig. 6 an enlarged view of part D in Fig. 5 is; Fig. 7 is a schematic representation of a further structure of a battery cell according to an embodiment of the present invention; Fig. 8 is a schematic representation of a further structure of a venting element according to an embodiment of the present invention; Fig. 9 is a schematic representation of a further structure of a venting element according to an embodiment of the present invention; Fig. 10 a schematic representation of a structure of a further venting element according to an embodiment of the present invention; Fig. 11 a schematic bar chart of the internal pressure distribution of a conventional battery cell before leaving the factory in related technologies is and Fig. 12 is a schematic bar chart of the internal pressure distribution of a battery cell with a venting element before leaving the factory according to an embodiment of the present invention. DESCRIPTION OF THE EXECUTION FORMS

[0022] The following section describes embodiments of the present invention in detail. Examples of these embodiments are illustrated in the accompanying drawings, where identical or similar reference numerals consistently denote identical or similar elements or elements with identical or similar functions. The embodiments described below with reference to the accompanying drawings are examples and serve only to illustrate the present invention and are not to be construed as limitations of the present invention.

[0023] In describing the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise" and the like is an orientation or positional relationship that is illustrated on the basis of the accompanying drawings and serves only to facilitate the description of the present invention and to simplify the descriptions, and does not indicate or imply that the device or element in question must have a particular orientation or be designed and operated in a particular orientation, and is therefore not to be understood as a limitation of the present invention.In the description of the present invention, “a plurality of” means two or more, unless otherwise clearly and expressly limited.

[0024] In the description of the present invention, it should be noted that the terms "assembly," "connection," and "joining" are to be understood in a broad sense unless otherwise clearly specified and limited. For example, the connection may be a permanent connection, a detachable connection, or an integral connection; the connection may be a mechanical or an electrical connection; and the connection may be a direct connection or an indirect connection using an intermediate medium, or represent internal communication or an interaction between two elements. For a person skilled in the art, the specific meaning of the foregoing terms in the present invention will be understandable from a concrete example.

[0025] In the present invention, unless otherwise clearly stated and limited, the fact that the first feature is "above" or "below" the second feature can mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact, but are in contact via a further feature between the first and the second feature. Furthermore, the fact that the first feature is "on," "above," and "above" the second feature includes that the first feature is located directly above and obliquely above the second feature, or simply that the horizontal height of the first feature is greater than that of the second feature.The fact that the first feature is located "below" and "under" the second feature includes the first feature being located directly below or diagonally below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0026] The disclosure of this description provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described herein. Naturally, the descriptions of the components and arrangements are merely examples and are not intended to limit the present invention. Furthermore, reference numerals and / or letters may be repeated in various examples within the present invention. Such repetition serves for simplification and clarity and does not in itself indicate a relationship between different embodiments and / or arrangements discussed.Furthermore, the present invention provides examples of various specific processes and materials, but a person skilled in the art in this field can recognize the application of other processes and / or the use of other materials.

[0027] With reference to Fig. 1, Fig. 2 and Fig. In one embodiment of the present invention, the battery cell 100 comprises a housing 10, an electrode core 20, and a venting element 30. A receiving chamber 12 is formed in the housing 10. A liquid injection port 13 is provided on the housing 10 and is connected to the receiving chamber 12. The electrode core 20 is housed in the receiving chamber 12. The venting element 30 is located in the receiving chamber 12 and is situated between the electrode core 20 and a side wall of the receiving chamber 12. The venting element 30 is provided with a first venting opening 32, a venting chamber 34, and a second venting opening 33. The venting chamber 34 is connected to the receiving chamber 12 via the first venting opening 32 and to the liquid injection port 13 via the second venting opening 33.

[0028] In the battery cell 100 described above, by providing the venting element 30, gas that penetrates and / or is generated in the electrode core 20 can pass through the first vent opening 32 into the vent chamber 34 and reach the liquid injection opening 13 via the vent chamber 34 and the second vent opening 33 in order to effectively remove the gas in the battery cell 100 during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell 100.

[0029] In particular, in the Fig. In the embodiment shown in Figure 1, the housing 10 has the shape of a rectangle. The receiving chamber 12 formed in the housing 10 can also have the shape of a rectangle. A liquid injection port 13 can be provided at one end of the housing 10. The liquid injection port 13 is connected to the receiving chamber 12. The electrode core 20 can be adapted to the receiving chamber 12 and arranged in the receiving chamber 12. The venting element 30 can have the shape of a plate. The venting element 30 can be arranged between the electrode core 20 and the side wall of the receiving chamber 12. A venting chamber 34 can be formed in the venting element 30. A first venting opening 32 can be provided on a side of the venting element 30 that is close to the electrode core 20. The venting element 30 can be provided with a plurality of first venting openings 32 arranged in an array.The first vent openings 32 can be connected to the receiving chamber 12. Two ends of the venting element 30 can each be provided with a second vent opening 33. The second vent opening 33 can be connected to the liquid injection opening 13. In one embodiment, if the electrode core 20 in the battery cell 100 lacks electrolyte solution, the electrolyte solution can be injected through the liquid injection opening 13, whereby a portion of the electrolyte solution can pass through the second vent opening 33 into the venting chamber 34 and finally enter the electrode core 20 through the first vent opening 32.In one embodiment, if the electrode core 20 in the battery cell 100 lacks electrolyte solution, the electrolyte solution can be injected through the liquid injection opening 13 and then enter the electrode core 20 via a liquid filling channel (not shown in the figure) in the housing 10. In another embodiment, the electrode core 20 in the battery cell 100 must be subjected to a vacuum extraction before the battery cell 100 leaves the factory.By providing the venting element 30, gas that penetrates and / or is generated in the electrode core 20 can pass through the first vent opening 32 into the vent chamber 34 and, via the vent chamber 34 and the second vent opening 33, reach the liquid injection opening 13 in order to effectively remove the gas in the battery cell 100 during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell 100.

[0030] It should be noted that, with reference to Fig. 11 and Fig. 12, a vacuum extraction process, which is carried out on the battery cell 100 before it leaves the factory, consists of extracting gas from the electrolyte solution in the electrode core 20. The gas is either gas that penetrates the electrolyte solution during injection or gas that is separated from it. By providing the venting element 30 in the battery cell 100, the electrode core 20 can rapidly reach a defined vacuum or a theoretical vacuum within a specific time period during vacuum extraction. Furthermore, poor uniformity of the internal pressure in the electrode core 20 can lead to variations in the overall thickness of the electrode core 20. By providing the venting element 30, the flowability of the gas inside the electrode core 20 can be improved.Within a specific timeframe of vacuum extraction, pressure differences at various positions within the same electrode core 20 are significantly reduced, and the vacuum values ​​of different electrode cores 20 can also reach similar levels. As a result, the uniformity of the internal pressure of the electrode cores 20 is greatly improved, and the thicknesses of the electrode cores 20 can also tend to be uniform. During use of the electrode core 20, the risk of an abnormal increase in local pressure due to a local gas blockage is reduced, and the safety performance of the electrode core 20 is enhanced.

[0031] Furthermore, the venting element comprises 30 in Fig. 4 furthermore a buckle structure 35. The buckle structure 35 can be arranged on an end section of the venting element 30. The buckle structure 35 can be provided with a buckle hole 36. In Fig. 6 The battery cell 100 further comprises a spacer ring 40. The spacer ring 40 can be arranged at an end section of the battery cell 100. In one embodiment, when the venting element 30 is installed in the housing 10, it can first be inserted into the receiving space 12, and then the venting element 30 is fastened to the spacer ring 40 through the buckle hole 36, thereby achieving a secure installation of the venting element 30. The battery cell 100 further comprises an insulating film 50. The insulating film 50 can be arranged between the housing 10 and the venting element 30. The insulating film 50 can be configured to separate a terminal from the housing 10 of the battery cell 100.

[0032] In the Fig. In the embodiment shown in Figure 1, the battery cell 100 is in a normal installation state. The normal installation state means that the battery cell 100 is arranged vertically and a side face of the battery cell 100 with a relatively small area is located longitudinally against a bottom face of the battery cell 100. The venting element 30 is located on a top face of the electrode core 20 and is positioned between the top face of the electrode core 20 and a side wall of the receiving chamber 12, which is located near the top face of the electrode core 20. In one embodiment, when the battery cell 100 is in a normal operating state, the electrolyte solution can accumulate at the bottom of the receiving chamber 12, which is located near the electrode core 20, and gas in the receiving chamber 12 or gas separated from the electrolyte solution can move in a direction near the top face of the electrode core 20.The gas can enter the vent chamber 34 through the first vent opening 32 and finally be discharged from the second vent opening 33, thereby avoiding local pressure anomalies of the electrode core 20 and further improving the safety performance of the electrode core 20.

[0033] With reference to Fig. 1 and Fig. In some embodiments, the housing 10 comprises two first cover plates 14 arranged in a first direction, and a frame body 15 connecting the two first cover plates 14 in the first direction. The liquid injection port 13 is located in one of the first cover plates 14. The battery cell 100 includes an explosion protection valve 60. The explosion protection valve 60 is located on the other first cover plate 14. The venting element 30 is located between the electrode core 20 and an inner surface of the frame body 15.

[0034] In this way, the venting element 30 can allow the gas to flow within the entire electrode core 20 in the receiving chamber 12, thereby reducing the risk of an increase in local pressure and thus reducing the risk of the explosion protection valve 60 opening unintentionally.

[0035] In particular, the battery cell 100 can comprise a flat battery. The flat battery can have a rectangular shape. In Fig. The first direction can be a longitudinal direction of the battery cell 100 and be represented by L. The housing 10 comprises a first cover plate 14 and a frame body 15. There can be two first cover plates 14. The first cover plate 14 can be arranged at two ends of the housing 10 in the L-direction. Two ends of the frame body 15 in the L-direction can be connected to the first cover plate 14 and can be enclosed by the first cover plate 14 to form the receiving space 12. The liquid injection port 13 can be arranged at a location on one first cover plate 14 near a top surface of the housing 10. The explosion protection valve 60 can be arranged at a location on the other first cover plate 14 near the top surface of the housing 10. Both the liquid injection port 13 and the explosion protection valve 60 can be arranged at a location near the second vent 33.In one embodiment, the venting element 30 can be arranged between the electrode core 20 and the inner surface of the frame body 15, and can be arranged between the liquid injection port 13 and the explosion protection valve 60, so that the venting element 30 can allow the gas to flow throughout the entire electrode core 20 in the receiving chamber 12, thereby reducing the risk of a local pressure increase and thus the risk of the explosion protection valve 60 opening unintentionally. Furthermore, a positive terminal 16 can be provided on a first cover plate 14 and a negative terminal 17 on a second first cover plate 14. The positive terminal 16 and the negative terminal 17 can be connected separately to the electrode core 20.

[0036] With reference to Fig. 1 In some embodiments, a ratio of the length of the venting element 30 to the length of the receiving space 12 in the first direction is selected from the range [50%, 100%].

[0037] In this way, the area of ​​gas collection can be increased and the gas content in the electrode core 20 can be reduced as much as possible.

[0038] In particular, in the Fig. In the embodiment shown in Figure 1, the length of the venting element 30 is represented by L1. The length of the receiving chamber 12 can be represented by L2. In one embodiment, the ratio of the length of the venting element 30 to the length of the receiving chamber 12 in the L-direction can be in a range of 50% to 100%. Gas escaping from an electrolyte solution in the electrode core 20 of the receiving chamber 12, as well as gas penetrating various areas of the receiving chamber 12, can be collected via the venting element 30, thus increasing the gas collection area and reducing the gas content in the electrode core 20 as much as possible.

[0039] In one example, the ratio of the length of the venting element 30 to the length of the receiving chamber 12 of the electrode can be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, or any other value between 50% and 100%.

[0040] It should be noted that in Fig. 1. The length of the venting element 30 is essentially equal to the length of the receiving chamber 12. In this case, gas can be collected in the receiving chamber 12 to a maximum extent.

[0041] With reference to Fig. 5 In some embodiments, a ratio of the width of the venting element 30 to the width of the receiving space 12 in a third direction is selected from the range [50%, 100%].

[0042] In this way it can be advantageous to collect gas and reduce the gas content in the electrode core 20.

[0043] In particular, in Fig. 5. The third direction is a width direction of the battery cell 100 and is represented by K. The width of the venting element 30 can be represented by K1. The width of the receiving chamber 12 can be represented by K2. In one embodiment, the ratio of the width of the venting element 30 to the width of the receiving chamber 12 in the K direction can be in a range of 50% to 100%, such that a gap remains between the venting element 30 and the side wall of the receiving chamber 12 in the K direction, which helps to collect gas and reduce the gas content in the electrode core 20.

[0044] In one example, the ratio of the width of the vent element 30 to the width of the receiving space 12 can be 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, or any other value between 50% and 100%. amount to.

[0045] With reference to Fig. In some embodiments, the housing 10 includes a second cover plate 18. The battery cell 100 includes an explosion protection valve 60. Both the liquid injection port 13 and the explosion protection valve 60 are arranged on the second cover plate 18. The venting element 30 is located between the electrode core 20 and the second cover plate 18.

[0046] In this way, the risk of unintentional opening of the explosion protection valve 60 can be reduced and the safety performance of the electrode core 20 improved.

[0047] In particular, the battery cell 100 can comprise a pouch battery. The pouch battery can have a square shape. In Fig. 7. The second cover plate 18 can be arranged at one end of the housing 10. In one embodiment, the positive terminal 16 can be arranged on the second cover plate 18, and the negative terminal 17 can be arranged at the other end of the housing 10, facing away from the second cover plate 18. The liquid injection port 13 can be arranged at one end of the housing 10, facing away from the second cover plate 18. The explosion protection valve 60 can be arranged at the other end of the housing 10, facing away from the second cover plate 18.In one embodiment, the venting element 30 can be arranged between the electrode core 20 and the second cover plate 18, wherein a second venting opening 33 can be arranged near and in conjunction with the liquid injection opening 13, and the other second venting opening 33 can be arranged near and in conjunction with the explosion protection valve 60, thereby facilitating gas extraction, reducing the risk of unintentional opening of the explosion protection valve 60, and improving the safety performance of the electrode core 20.

[0048] With reference to Fig. 3 and Fig. 4 In some embodiments, the venting element 30 is provided with a third venting opening 37, which is connected to the venting chamber 34. The third venting opening 37 is connected to the first venting opening 32 in a thickness direction of the venting element 30.

[0049] In this way, the venting element 30 can be connected upwards and downwards to prevent gas from not being extracted from a dead corner.

[0050] In particular, the venting element 30 is provided with a first venting opening 32 in a side wall of the venting chamber 34. The venting element 30 can be provided with a third venting opening 37 in the other side wall opposite a side wall of the first venting opening 32. The venting element 30 can be provided with a plurality of third venting openings 37 arranged in an array. Fig. 4 The thickness direction of the venting element 30 can be represented by D. In one embodiment, the third venting opening 37 can be connected to the first venting opening 32 in the D direction, and the third venting opening 37 can be arranged above the first venting opening 32, so that the venting element 30 can be connected upwards and downwards to prevent gas from being unable to be extracted from a dead corner.

[0051] It should be noted that the third vent 37 can be arranged not only in accordance with the first vent 32, but also offset from the first vent 32. The number of third vents 37 can not only correspond to the number of first vents 32, but can also differ from the number of first vents 32, which can be adapted depending on the specific situation and is not specifically limited here.

[0052] With reference to Fig. 5 In some embodiments, a ratio of the height of the venting element 30 to the height of the receiving space 12 in a second direction is selected from the range [0.1%, 10%].

[0053] In this way, it can be ensured that the receiving chamber 12 has enough space to accommodate the electrode core 20, thereby reducing the space requirement of the venting element 30 in the receiving chamber 12.

[0054] In particular, in the Fig. In the embodiment shown in Figure 5, the second direction is a vertical direction of the battery cell 100 and is represented by H. The height of the venting element 30 can be represented by H1. The height of the receiving space 12 can be represented by H2. In one embodiment, the ratio of the height H1 of the venting element 30 to the height H2 of the receiving space 12 in the H direction can be in a range of 0.1% to 10%, so that it can be ensured that the receiving space 12 has sufficient space to accommodate the electrode core 20, thereby reducing the space requirement of the venting element 30 in the receiving space 12.

[0055] In an example, the ratio of the height H1 of the venting element 30 to the height H2 of the receiving chamber 12 can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4.0%, 4.1%, 4.2%, 4.3%. 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6.0%, 6.1%, 6.2%, 6.3%, 6.4%, 6.5%, 6.6%, 6.7%, 6.8%, 6.9%, 7.0%, 7.1%, 7.2%, 7.3%, 7.4%, 7.5%, 7.6%, 7.7%, 7.8%, 7.9%, 8.0%, 8.1%, 8.2%, 8.3%, 8.4%, 8.5%, 8.6%, 8.7%, 8.8%, 8.9%, 9.0%, 9.1%, 9.2% 9.3%, 9.4%, 9.5%, 9.6%, 9.7%, 9.8%, 9.9%, 10.0% or any other value between 0.1% and 10%.

[0056] Furthermore, the material of the venting element 30 can be a polymer material, for example, one or more of the following polymer materials: PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), nylon, PVC (polyvinyl chloride), PU (polyurethane), PAM (polyacrylamide), or PTFE (polytetrafluoroethylene). Alternatively, the venting element 30 can be made of a metal or a metal composite material, for example, one or more metals such as aluminum, copper, or iron. Alternatively, the venting element 30 can be made of an inorganic non-metallic material, for example, one or more ceramic materials with high thermal conductivity such as silicon carbide, silicon nitride, or aluminum nitride, and one or more oxide insulating ceramic materials such as zirconium oxide or aluminum oxide.This means that the venting element 30 can be manufactured using the aforementioned materials to improve thermal conductivity and heat resistance.

[0057] With reference to Fig. In some embodiments, a support element 38 is provided in the ventilation chamber 34. The support element 38 is connected to at least two opposite side walls of the ventilation chamber 34.

[0058] In this way, the structural strength of the venting element 30 can be improved.

[0059] In particular, in Fig. 8 Two support elements 38 are provided in the ventilation space 34. The two support elements 38 can be arranged at intervals and perpendicular to two opposite side walls in a D-direction, thereby improving the structural strength of the ventilation element 30 and making the ventilation element 30 less susceptible to deformation during assembly and use.

[0060] With reference to Fig. 9 In some embodiments, the cross-section of the ventilation chamber 34 has the shape of a rectangle. The support elements 38 are connected to each other crosswise and each is connected to two pairs of opposite corners of the rectangle.

[0061] In this way, the structural strength of the venting element 30 can be improved.

[0062] In particular, in Fig. 9 Two support elements 38 are provided. The two support elements 38 can be connected crosswise in the vent space 34. One support element 38 is connected to one pair of opposite corners of the vent space 34, and the other support element 38 is connected to the other pair of opposite corners of the vent space 34, thereby improving the structural strength of the vent element 30 and making the vent element 30 less susceptible to deformation during assembly and use.

[0063] With reference to Fig. In some embodiments, the battery cell 100 comprises a lyophobic layer 70. The lyophobic layer 70 is arranged on the side wall of the venting chamber 34.

[0064] This prevents the electrolyte solution from becoming blocked, which is beneficial for gas circulation.

[0065] In particular, the side wall of the vent chamber 34 can be coated with the lyophobic layer 70. The lyophobic layer 70 can be a lyophobic coating material for electrolyte solutions, for example, one or more fluorocarbon coatings such as PTFE (polytetrafluoroethylene), FEP (fluorinated ethylene propylene copolymer), or ECTE. In one embodiment, coating the side wall of the vent chamber 34 with the lyophobic layer 70 prevents blockage by the electrolyte solution and ensures gas circulation.

[0066] With reference to Fig. 1 comprises a battery pack (not shown in the figure) in one embodiment of the present invention, the battery cell 100 in one of the aforementioned embodiments.

[0067] In the aforementioned battery pack, by providing the venting element 30, gas that penetrates and / or is generated in the electrode core 20 can pass through the first vent opening 32 into the vent chamber 34 and reach the liquid injection opening 13 via the vent chamber 34 and the second vent opening 33 in order to effectively remove the gas in the battery cell 100 during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell 100.

[0068] In particular, a plurality of individual cell batteries 100 can be arranged in the battery pack. In one embodiment, by providing the venting element 30, gas that penetrates and / or is generated in the electrode core 20 can pass through the first vent opening 32 into the vent chamber 34, reach the liquid injection opening 13 via the vent chamber 34 and the second vent opening 33, and then the gas can be effectively extracted from the battery cell 100 by means of vacuum extraction. The uniformity of the internal pressure of the battery cell 100 can result in a flat outer surface of the battery cell 100.Therefore, the majority of individual cell batteries 100 can be arranged compactly during the assembly of the battery pack, which is advantageous for structural stability and avoids excessive thickness differences between the individual cell batteries 100, thus avoiding inconsistent spacing between the individual cell batteries 100 after assembly of the entire battery pack as well as inconsistent loads on the individual cell batteries 100 during subsequent use.

[0069] With reference to Fig. 1 In one embodiment of the present invention, a vehicle comprises the battery pack in one of the aforementioned embodiments.

[0070] In the aforementioned vehicle, by providing the venting element 30, gas that penetrates and / or is generated in the electrode core 20 can pass through the first vent opening 32 into the vent chamber 34 and reach the liquid injection opening 13 via the vent chamber 34 and the second vent opening 33 in order to effectively discharge the gas in the battery cell 100 during vacuum extraction and thereby improve the uniformity of the internal pressure and the electrochemical performance of each battery cell 100.

[0071] In particular, the vehicle includes, among other things, a pure electric vehicle, an electric vehicle with range extension, a plug-in hybrid electric vehicle, and a non-plug-in hybrid electric vehicle. In one embodiment, a plurality of individual cell batteries 100 can be provided in the vehicle, and the plurality of individual cell batteries 100 can be assembled into a battery pack so that the battery pack can be installed in the vehicle.

[0072] In the description of this specification, terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "a specific example," or "some examples" mean that certain features, structures, materials, or properties described with reference to embodiments or examples are included in at least one embodiment or example of the present invention. In this description, illustrative expressions of the aforementioned terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or properties may be combined appropriately in one or more embodiments or examples.

[0073] Although the embodiments of the present invention have been shown and described, it will be clear to the person skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and purpose of the present invention, and the scope of the present invention is defined by the claims and their equivalents. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202311162742

[0001]

Claims

[1] Battery cell, comprising: a housing, wherein a receiving chamber is formed in the housing and a liquid injection opening connected to the receiving chamber is provided in the housing; an electrode core, wherein the electrode core is housed in the receiving chamber; and a venting element, wherein the venting element is located in the receiving chamber and is situated between the electrode core and a side wall of the receiving chamber, the venting element is provided with a first venting opening, a venting chamber and a second venting opening, and the venting chamber is connected to the receiving chamber via the first venting opening and to the liquid injection opening via the second venting opening. [2] Battery cell according to claim 1, wherein the housing comprises two first cover plates arranged in a first direction and a frame body connected in a first direction to the two first cover plates, the liquid injection opening is arranged in one of the first cover plates, the battery cell comprises an explosion protection valve, the explosion protection valve is arranged on the other first cover plate and the venting element is located between the electrode core and an inner surface of the frame body. [3] Battery cell according to claim 2, wherein a ratio of the length of the venting element to the length of the receiving space in the first direction is selected from the range [50%, 100%]. [4] Battery cell according to claim 1, wherein a ratio of the height of the venting element to the height of the receiving space in a second direction is selected from the range [0.1%, 10%]. [5] Battery cell according to claim 1, wherein a ratio of the width of the venting element to the width of the receiving space in a third direction is selected from the range [50%, 100%]. [6] Battery cell according to claim 1, wherein the housing comprises a second cover plate, the battery cell comprises an explosion protection valve, both the liquid injection port and the explosion protection valve are arranged on the second cover plate, and the venting element is located between the electrode core and the second cover plate. [7] Battery cell according to claim 1, wherein a third vent opening is provided in the venting element which is connected to the venting space and the third vent opening is connected to the first vent opening in a thickness direction of the venting element accordingly. [8] Battery cell according to claim 1, wherein a support element is provided in the venting space and the support element is connected to at least two opposite side walls of the venting space. [9] Battery cell according to claim 8, wherein a cross-section of the venting space has the shape of a rectangle and two support elements are connected crosswise to each other and each is connected to two pairs of opposite corners of the rectangle. [10] Battery cell according to claim 1, wherein the battery cell comprises a lyophobic layer arranged on a side wall of the venting space. [11] Battery pack comprising the battery cell according to any one of claims 1 to 10. [12] Vehicle comprising the battery pack according to claim 11.