Lithium ion battery, battery pack and vehicle

Abstract

The invention provides a lithium ion battery, a battery pack and a vehicle, the lithium ion battery comprises: a shell, the shell is provided with an accommodating cavity, and the accommodating cavity is provided with a first opening and a second opening which are oppositely arranged; the battery cell is arranged in the accommodating cavity, and the battery cell is provided with a positive electrode lug and a negative electrode lug; the negative electrode assembly is arranged at the first opening, the negative electrode assembly comprises a negative electrode cover plate and a negative electrode plate, the negative electrode cover plate is integrally formed on the shell, the negative electrode plate comprises an electrode plate part and a pole part, the electrode plate part is connected with the negative electrode lug, and at least part of the pole part extends out of the accommodating cavity after passing through the negative electrode cover plate; the positive electrode assembly is arranged at the second opening, and a positive electrode plate of the positive electrode assembly is connected with the positive electrode lug. According to the lithium ion battery in the scheme, through the integration of the shell and the negative electrode cover plate and the integrated design of the pole plate part and the pole column part, the number of parts of the battery and assembly procedures are reduced, the weight or the size of a structural part is reduced, and the energy density of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion batteries, and in particular to a lithium-ion battery, a battery pack and a vehicle. Background Art

[0002] Existing cylindrical lithium-ion batteries have a complex structure, consisting of numerous components. This not only increases manufacturing costs but also leads to high processing difficulty and long assembly times. The complex structure and multiple assembly steps not only increase component costs but also reduce the battery's overall energy density.

[0003] Currently, no effective solution has been proposed to the problems of high cost and low energy density caused by the complex structure of lithium-ion batteries in existing technologies. Summary of the Invention

[0004] The main purpose of the present invention is to provide a lithium-ion battery, a battery pack and a vehicle to solve the problems of high cost and low energy density caused by the complex structure of lithium-ion batteries in the prior art.

[0005] To achieve the above-mentioned object, according to one aspect of the present invention, there is provided a lithium-ion battery, comprising: a shell, the shell being provided with a accommodating cavity, the accommodating cavity having a first opening and a second opening arranged opposite to each other; a battery cell, the battery cell being arranged in the accommodating cavity, the battery cell having a positive electrode tab and a negative electrode tab; a negative electrode assembly, the negative electrode assembly being arranged at the first opening, the negative electrode assembly comprising a negative electrode cover and a negative electrode plate, the negative electrode cover being integrally formed on the shell, the negative electrode plate comprising a plate portion and a column portion, the plate portion being connected to the negative electrode tab, and at least a portion of the column portion extending out of the accommodating cavity after passing through the negative electrode cover; and a positive electrode assembly, the positive electrode assembly being arranged at the second opening, the positive electrode plate of the positive electrode assembly being connected to the positive electrode tab.

[0006] Furthermore, the pole portion includes: a first pole segment, the first pole segment is integrally formed at the first end surface of the pole plate portion, and the first pole segment extends into the central tube of the battery cell; a second pole segment, the second pole segment is integrally formed at the second end surface of the pole plate portion, the second pole segment is located outside the accommodating cavity, and the second pole segment is coaxially arranged with the first pole segment.

[0007] Furthermore, a boss is provided at one end of the negative electrode cover away from the accommodating cavity, and a through hole is provided on the boss. The second pole segment has a first shaft segment and a second shaft segment. The first shaft segment is arranged close to the first pole segment, the shaft diameter of the first shaft segment is larger than the shaft diameter of the second shaft segment, and the first shaft segment extends into the through hole.

[0008] Furthermore, a first channel is provided on the end surface of the electrode plate portion connected to the negative electrode tab.

[0009] Furthermore, the positive electrode assembly also includes: a positive electrode cover plate, the positive electrode cover plate is covered at the second opening, and the positive electrode cover plate is provided with a liquid injection port; a positive electrode adapter plate, the positive electrode adapter plate is arranged in the accommodating cavity, the positive electrode adapter plate is connected to the positive electrode plate, the positive electrode adapter plate is provided with a third channel, the positive electrode plate is provided with a second channel, and the second channel and the third channel are connected; an isolation positioning ring, the isolation positioning ring is arranged between the positive electrode adapter plate and the positive electrode cover plate, and the isolation positioning ring is provided with a fourth channel, and the fourth channel is respectively connected with the liquid injection port and the third channel; a positive electrode post, the positive electrode post passes through the positive electrode cover plate, the isolation positioning ring, the positive electrode adapter plate and the positive electrode plate in sequence, part of the positive electrode post extends into the central tube of the battery cell, and part of the positive electrode post is located outside the accommodating cavity; a positive electrode post sleeve, the positive electrode post sleeve is sleeved on the positive electrode post, and the positive electrode post sleeve is arranged between the positive electrode post and the positive electrode cover plate.

[0010] Furthermore, a flange is provided at one end of the positive electrode plate away from the positive electrode ear, and the flange is arranged along the circumference of the positive electrode plate so that the flange is arranged to form a receiving groove, and part of the positive electrode adapter plate extends into the receiving groove, and the inner wall of the flange is connected to the outer wall of the positive electrode adapter plate. A plurality of notches are provided on the flange, and the notches connect the gap between the outer wall of the battery cell and the shell.

[0011] Furthermore, the isolation positioning ring includes: a first isolation ring, which is an annular structure; a second isolation ring, which is an annular structure, the second isolation ring is coaxially arranged with the first isolation ring, and the second isolation ring is located outside the first isolation ring; connecting ribs, there are multiple connecting ribs, and the multiple connecting ribs are arranged at intervals along the circumference of the second isolation ring, and the multiple connecting ribs are connected between the first isolation ring and the second isolation ring to form multiple fourth channels between the first isolation ring and the second isolation ring; the second isolation ring is provided with multiple grooves, and the multiple grooves are arranged at intervals along the circumference of the second isolation ring, and the grooves connect the gap between the outer wall of the battery cell and the shell.

[0012] Furthermore, the isolation positioning ring includes: a first isolation ring, which is a ring-shaped structure; a second isolation ring, which is a fan-shaped structure, and there are at least two second isolation rings, each second isolation ring is connected to the outer wall of the first isolation ring, and a fourth channel is formed between the second isolation ring and the first isolation ring, and a fifth channel is formed between the two adjacent second isolation rings, and the fifth channel connects the gap between the outer wall of the battery cell and the shell.

[0013] According to another aspect of the present invention, a battery pack is provided. The battery pack includes at least one lithium-ion battery, and the lithium-ion battery is the lithium-ion battery described above.

[0014] According to another aspect of the present invention, a vehicle is provided. The vehicle includes a lithium-ion battery, and the lithium-ion battery is the lithium-ion battery described above.

[0015] Using the technical solution of the present invention, the negative electrode cover is used to seal the first opening of the housing. The negative electrode cover is integrally formed on the housing, reducing the number of independent components, simplifying the battery structure, and reducing the number of independent components. The negative electrode plate includes a plate portion and a pole portion, which is connected to the negative electrode tab. That is, the negative electrode plate is an integrally formed structure, and no assembly connection is required between the plate portion and the pole portion, further reducing the number of independent components. The lithium-ion battery in the above solution, through the integration of the housing and the negative electrode cover, and the integration of the plate portion and the pole portion, reduces the number of battery parts and assembly steps, reduces the weight or volume of structural components, and improves the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of the internal structure of the lithium-ion battery of the present invention is shown;

[0018] Figure 2 shows a schematic structural diagram of the negative electrode assembly in the present invention;

[0019] Figure 3 Shows a schematic structural diagram of the negative electrode plate in the present invention;

[0020] Figure 4 Shows a schematic structural diagram of the positive electrode assembly in the present invention;

[0021] Figure 5 Shows a schematic structural diagram of the positive electrode plate in the present invention;

[0022] Figure 6 It shows a schematic structural diagram of the isolation and positioning ring in the present invention;

[0023] Figure 7 It shows a schematic structural diagram of the isolation and positioning ring in the present invention;

[0024] Figure 8 The figure shows a schematic structural diagram of the positive electrode assembly in the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 10. Housing;

[0027] 20. Battery cells;

[0028] 21. Positive electrode tab; 22. Negative electrode tab; 23. Center tube;

[0029] 30. Negative electrode assembly;

[0030] 31. Negative electrode plate;

[0031] 311, plate portion; 3111, first channel;

[0032] 312, first pole segment;

[0033] 313, second pole segment; 3131, first shaft segment; 3132, second shaft segment;

[0034] 32. Negative electrode cover; 321. Boss;

[0035] 40. Positive electrode assembly;

[0036] 41, positive electrode plate; 411, second channel; 412, flange; 4121, notch;

[0037] 42. positive electrode cover; 421. liquid injection port;

[0038] 43. Positive electrode adapter plate; 431. Third channel;

[0039] 44, isolation and positioning ring; 441, first isolation ring; 442, second isolation ring; 4421, groove; 443, connecting rib; 444, fourth channel; 445, fifth channel;

[0040] 45. Positive pole;

[0041] 46. ​​Positive pole sleeve;

[0042] 47. Sealing ring. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0047] In the prior art, the negative electrode of a lithium-ion battery is equipped with a negative electrode cover, a negative electrode post, and a negative electrode adapter plate. The negative electrode cover and the housing are separate structures. The negative electrode cover and the housing require separate connections, and the negative electrode post and the negative electrode adapter plate require separate connections. This means that the negative electrode of a lithium-ion battery has many components, resulting in long assembly time and high costs. Furthermore, the large number of components increases the overall weight or volume of the lithium-ion battery, thereby reducing the energy density of the lithium-ion battery.

[0048] Combine Figures 1 to 8 As shown, according to a specific embodiment of the present application, a lithium-ion battery is provided.

[0049] Specifically, the lithium-ion battery includes: a shell 10, a battery cell 20, a negative electrode assembly 30 and a positive electrode assembly 40. The shell 10 is provided with a accommodating cavity, and the accommodating cavity has a first opening and a second opening arranged opposite to each other. The battery cell 20 is arranged in the accommodating cavity, and the battery cell 20 has a positive electrode tab 21 and a negative electrode tab 22. The negative electrode assembly 30 is arranged at the first opening, and the negative electrode assembly 30 includes a negative electrode cover 32 and a negative electrode plate 31. The negative electrode cover 32 is integrally formed on the shell 10. The negative electrode plate 31 includes a plate portion 311 and a pole portion. The plate portion 311 is connected to the negative electrode tab 22, and at least part of the pole portion extends out of the accommodating cavity after passing through the negative electrode cover 32. The positive electrode assembly 40 is arranged at the second opening, and the positive electrode plate 41 of the positive electrode assembly 40 is connected to the positive electrode tab 21.

[0050] In an embodiment of the present application, the negative electrode cover 32 is used to seal the first opening of the housing 10. The negative electrode cover 32 is integrally formed on the housing 10, reducing the number of independent components, simplifying the battery structure, and reducing the number of independent components. The negative electrode plate 31 includes a plate portion 311 and a pole portion. The plate portion 311 is connected to the negative electrode tab 22, that is, the negative electrode plate 31 is an integrally formed structure. There is no need for assembly connection between the plate portion 311 and the pole portion, further reducing the number of independent components. The lithium-ion battery in the above scheme reduces the number of battery parts and assembly processes through the integration of the housing 10 and the negative electrode cover 32, and the integration of the plate portion 311 and the pole portion, reducing the weight or volume of the structural parts, and improving the energy density of the battery.

[0051] It should be noted that the electrode portion 311 serves as the negative electrode plate 31 and is connected to the negative electrode tab 22 .

[0052] In an exemplary embodiment of the present application, the pole portion includes: a first pole segment 312 and a second pole segment 313, the first pole segment 312 is integrally formed at the first end surface of the pole plate portion 311, and the first pole segment 312 extends into the central tube 23 of the battery cell 20, and the second pole segment 313 is integrally formed at the second end surface of the pole plate portion 311, and the second pole segment 313 is located outside the accommodating cavity, and the second pole segment 313 is coaxially arranged with the first pole segment 312.

[0053] In an embodiment of the present application, the first pole segment 312 is plugged into the central tube 23 of the battery cell 20, providing additional support for the internal structure of the battery cell 20, so as to effectively fix the positions of the pole pieces and diaphragms of each layer inside the battery cell 20, prevent the expansion and contraction during the battery charging and discharging process from causing displacement of the internal structure of the battery cell 20, and improve the overall stability and reliability of the battery. The first pole segment 312 is plugged into the central tube 23 of the battery cell 20, which simplifies the battery assembly process and eliminates the need for additional fasteners to connect the pole and the central tube 23. In addition, the first pole segment 312 extends into the central tube 23 of the battery cell 20 and can serve as a guiding structure for the flow of electrolyte, optimizing the distribution of the electrolyte inside the battery cell 20, ensuring that the electrolyte can evenly cover each layer of pole pieces, and improving the migration efficiency of lithium ions, thereby improving the electrochemical performance of the battery and extending the battery life.

[0054] like Figure 2 As shown, the pole portion and the plate portion 311 are integrally formed, that is, the negative electrode plate 31 is an integrally formed structure. The plate portion 311 is welded to the negative electrode tab 22. The pole portion includes a first pole segment 312 and a second pole segment 313. The second pole segment 313 is coaxially arranged with the first pole segment 312. The diameter of the first pole segment 312 is smaller than that of the second pole segment 313. The first pole segment 312 is inserted into the central tube 23 of the battery cell 20 to support the battery cell 20, and the second pole segment 313 is located outside the accommodating cavity.

[0055] In an exemplary embodiment of the present application, a boss 321 is provided at one end of the negative electrode cover plate 32 away from the accommodating cavity, and a through hole is provided on the boss 321. The second pole segment 313 has a first shaft segment 3131 and a second shaft segment 3132. The first shaft segment 3131 is arranged close to the first pole segment 312. The axial diameter of the first shaft segment 3131 is greater than the axial diameter of the second shaft segment 3132. The first shaft segment 3131 extends into the through hole.

[0056] In an embodiment of the present application, the first shaft segment 3131 extends into the through hole of the boss 321, and the first shaft segment 3131 is connected to the through hole, that is, the second pole segment 313 does not need to occupy the accommodation space in the shell 10, so that the interior of the battery can be arranged more compactly, increasing the proportion of active materials, thereby improving the energy density of the battery.

[0057] like Figure 2 As shown, the negative electrode cover is integrally formed on the housing 10. A boss 321 is provided in the middle of the negative electrode cover plate 32. The boss 321 is arranged away from the accommodating cavity. The boss 321 is provided with a through hole, and the second pole segment 313 extends out of the accommodating cavity through the through hole. The second pole segment 313 has a first shaft segment 3131 and a second shaft segment 3132. The first shaft segment 3131 extends into the through hole, and the boss 321 and the first shaft segment 3131 are connected by welding. The shaft diameter of the first shaft segment 3131 is larger than the shaft diameter of the second shaft segment 3132, that is, the second shaft segment 3132 is arranged away from the boss 321 in the radial direction to reserve sufficient welding space. The second shaft segment 3132 can be a straight axis or can be provided with an external thread.

[0058] In an exemplary embodiment of the present application, a first channel 3111 is provided on the end surface of the electrode plate portion 311 connected to the negative electrode tab 22 .

[0059] In the embodiment of the present application, the first channel 3111 serves as a circulation channel for the electrolyte, guiding the electrolyte to more effectively penetrate each layer of the battery cell 20, shortening the time it takes for the electrolyte to fully infiltrate the battery cell 20. Because the active material within the battery cell 20 is distributed throughout the positive and negative electrode sheets, relying solely on the natural diffusion of the electrolyte may result in uneven electrolyte concentration in some areas of the negative electrode, affecting battery performance. The presence of the first channel 3111 promotes uniform distribution of the electrolyte on the negative electrode plate 31, avoiding localized over-concentration or over-dilutement, and ensuring the consistency of the electrochemical reaction within the battery cell 20.

[0060] like Figure 3 As shown, the electrode portion 311 is provided with a plurality of first channels 3111, and the plurality of first channels 3111 are evenly distributed along the circumference of the electrode portion 311. The first channels 3111 can be elongated holes, fan-shaped holes, etc.

[0061] In an exemplary embodiment of the present application, the positive electrode assembly 40 further includes: a positive electrode cover plate 42, a positive electrode adapter plate 43, an isolation and positioning ring 44, a positive electrode column 45, and a positive electrode column sleeve 46. The positive electrode cover plate 42 covers the second opening and is provided with a liquid injection port 421. The positive electrode adapter plate 43 is disposed in the accommodating cavity and is connected to the positive electrode plate 41. The positive electrode adapter plate 43 is provided with a third hole 431. The positive electrode plate 41 is provided with a second hole 411. The second hole 411 and the third hole 431 are connected. The isolation and positioning ring 44 is disposed between the positive electrode adapter plate 43 and the positive electrode cover plate 42. The isolation and positioning ring 44 is provided with a fourth hole 444. The fourth hole 444 is respectively connected to the liquid injection port 421 and the third hole 431. The positive electrode post 45 sequentially passes through the positive electrode cover 42, the isolation ring 44, the positive electrode adapter plate 43, and the positive electrode plate 41. Part of the positive electrode post 45 extends into the center tube 23 of the battery cell 20, while part of the positive electrode post 45 is located outside the receiving cavity. The positive electrode post sleeve 46 is mounted on the positive electrode post 45 and is located between the positive electrode post 45 and the positive electrode cover 42.

[0062] In an embodiment of the present application, the positive cover plate 42 is used to block the second opening of the housing 10 to protect the battery cell 20 from the external environment. At the same time, a liquid injection port 421 is provided to facilitate battery liquid injection operation. The positive adapter plate 43 is connected to the positive electrode plate 41 for conducting current. At the same time, the third hole 431 on the positive adapter plate 43 is connected to the second hole 411 on the positive electrode plate 41 to form an electrolyte flow path. The housing 10 is connected to the plate portion 311 of the negative electrode assembly 30. The isolation positioning ring 44 is located between the positive adapter plate 43 and the positive cover plate 42 to isolate the positive and negative poles of the battery to prevent direct contact between the two and cause a short circuit. The fourth hole 444 on the isolation positioning ring 44 is connected to the liquid injection port 421 and the third hole 431 to form an electrolyte flow path, that is, the electrolyte slowly penetrates into the interior of the battery cell 20 through the liquid injection port 421, the fourth hole 444, the third hole 431 and the second hole 411 in sequence. The positive electrode post 45 serves as an external connector for the battery's positive electrode. A portion of the positive electrode post 45 extends into the central tube 23 of the battery cell 20 to ensure the integrity and stability of the internal circuit. The remaining portion resides outside the housing 10 for electrical connection to other batteries or external devices. A positive electrode post sleeve 46 is positioned between the positive electrode post 45 and the positive electrode cover 42 to enhance sealing and prevent electrolyte leakage. It also provides additional mechanical protection for the positive electrode post 45.

[0063] like Figure 4 As shown, the positive electrode sleeve 46 is an integrally formed structure, an annular groove 4421 is formed on the positive electrode sleeve 46 , and a portion of the positive electrode cover plate 42 extends into the annular groove 4421 .

[0064] As an alternative embodiment, Figure 8As shown, in addition to the positive electrode sleeve 46 , a sealing ring 47 is also provided. The positive electrode sleeve 46 is connected to the sealing ring 47 , and an annular groove 4421 is formed between the positive electrode sleeve 46 and the sealing ring 47 . Part of the positive electrode cover 42 extends into the annular groove 4421 .

[0065] In an exemplary embodiment of the present application, a flange 412 is provided at one end of the positive electrode plate 41 away from the positive electrode ear 21, and the flange 412 is arranged along the circumference of the positive electrode plate 41 so that the flange 412 is surrounded to form a receiving groove, and part of the positive electrode adapter plate 43 extends into the receiving groove, and the inner wall of the flange 412 is connected to the outer wall of the positive electrode adapter plate 43, and a plurality of notches 4121 are provided on the flange 412, and the notches 4121 connect the gap between the outer wall of the battery cell 20 and the shell 10.

[0066] In the embodiment of the present application, the flange 412 provided on the positive electrode plate 41 is arranged along the circumference, and the surrounding receiving groove provides positioning and support for the positive electrode adapter plate 43. This structure can enhance the connection strength between the positive electrode plate 41 and the positive electrode adapter plate 43, ensuring the stability and conductivity of the positive electrode assembly 40 during the battery charging and discharging process. The multiple notches 4121 on the flange 412 connect the gap between the outer wall of the battery cell 20 and the shell 10, providing additional channels for the penetration and distribution of the electrolyte, and facilitating the uniform distribution of the electrolyte between the battery cell 20 and the shell 10, ensuring that all parts of the battery cell 20 can be effectively infiltrated, improving the migration efficiency of lithium ions between the positive and negative electrodes, and thus improving the electrochemical performance and cycle life of the battery.

[0067] like Figure 5 As shown, the positive electrode plate 41 is provided with a plurality of second channels 411, which are spaced apart along the circumference of the positive electrode plate 41 to ensure uniform distribution of the electrolyte. A flange 412 is provided at the edge of the positive electrode plate 41. The flange 412 extends along the circumference of the positive electrode plate 41 to form a receiving groove. The flange 412 supports and positions the positive electrode adapter plate 43. The flange 412 is provided with a plurality of notches 4121, which are spaced apart along the positive electrode plate 41 to allow the electrolyte to flow through the notches 4121 into the gap between the outer wall of the battery cell 20 and the housing 10, thereby allowing the electrolyte to penetrate the battery cell 20 from the inside out.

[0068] In an exemplary embodiment of the present application, the isolation and positioning ring 44 includes a first isolation ring 441 and a second isolation ring 442. The first isolation ring 441 is an annular structure, and the second isolation ring 442 is an annular structure. The second isolation ring 442 is coaxially arranged with the first isolation ring 441 and located outside the first isolation ring 441. A plurality of connecting ribs 443 are arranged at intervals along the circumference of the second isolation ring 442. The plurality of connecting ribs 443 are connected between the first isolation ring 441 and the second isolation ring 442, thereby forming a plurality of fourth channels 444 between the first isolation ring 441 and the second isolation ring 442. The second isolation ring 442 is provided with a plurality of grooves 4421, which are arranged at intervals along the circumference of the second isolation ring 442. The grooves 4421 connect the gap between the outer wall of the battery cell 20 and the housing 10.

[0069] In the embodiment of the present application, the first isolation ring 441 and the second isolation ring 442 are coaxially arranged. This dual-ring structure increases the stability of the isolation positioning ring 44, effectively supporting the positive electrode adapter plate 43 and the positive electrode cover plate 42, and reducing structural displacement caused by expansion or contraction during battery charging and discharging. The multiple fourth channels 444 between the first isolation ring 441 and the second isolation ring 442 are the flow paths for the electrolyte. The multiple grooves 4421 on the second isolation ring 442 connect the gap between the outer wall of the battery cell 20 and the shell 10, further expanding the electrolyte penetration path. The presence of the grooves 4421 also promotes the circulation of the electrolyte within the battery, facilitating cooling and heat dissipation, and extending the battery life.

[0070] like Figure 6 As shown, a first isolation ring 441 and a second isolation ring 442 are coaxially arranged, and a plurality of connecting ribs 443 are connected between the first isolation ring 441 and the second isolation ring 442 to divide the space between the first isolation ring 441 and the second isolation ring 442 into a plurality of fourth channels, allowing the electrolyte to penetrate into the interior of the battery cell 20 through the isolation positioning ring 44. The second isolation ring 442 is provided with a plurality of grooves 4421, so that a first connecting channel is formed between the second isolation ring 442 and the positive electrode cover plate 42, and the first connecting channel connects to the gap between the outer wall of the battery cell 20 and the housing 10; and a second connecting channel is formed between the second isolation ring 442 and the positive electrode adapter plate 43, and the second connecting channel connects to the gap between the outer wall of the battery cell 20 and the housing 10.

[0071] As an alternative embodiment, the isolation positioning ring 44 includes: a first isolation ring 441 and a second isolation ring 442, the first isolation ring 441 is a ring structure ring, the second isolation ring 442 is a fan-shaped structure, there are at least two second isolation rings 442, each second isolation ring 442 is connected to the outer wall of the first isolation ring 441, a fourth channel 444 is formed between the second isolation ring 442 and the first isolation ring 441, and a fifth channel 445 is formed between two adjacent second isolation rings 442, and the fifth channel 445 connects the gap between the outer wall of the battery cell 20 and the shell 10.

[0072] In the embodiment of the present application, the second isolation ring 442 is a fan-shaped structure, so that a fifth channel 445 with a larger flow area is formed between two adjacent second isolation rings 442 to accelerate the rapid flow of electrolyte into the gap between the outer wall of the battery cell 20 and the shell 10.

[0073] like Figure 7 As shown, there are two second isolation rings 442, which are arranged opposite to each other along the radial direction of the first isolation ring 441, and a fifth channel 445 is formed between the two second isolation rings 442. The second isolation rings 442 and the first isolation ring 441 are jointly arranged to form a fourth channel 444.

[0074] According to another specific embodiment of the present application, a battery pack is provided, which includes at least one lithium-ion battery, and the lithium-ion battery is the lithium-ion battery in the above embodiment.

[0075] In the embodiment of the present application, the negative electrode cover 32 is integrally formed on the housing 10, reducing the number of independent components, simplifying the battery structure, and reducing the number of independent components; the negative electrode plate 31 includes a plate portion 311 and a pole portion, and the plate portion 311 is connected to the negative electrode tab 22. That is, the negative electrode plate 31 is an integrally formed structure, and there is no need for an assembly connection between the plate portion 311 and the pole portion, further reducing the number of independent components. The lithium-ion battery in the above scheme reduces the number of battery parts and assembly processes through the integration of the housing 10 and the negative electrode cover 32, and the integration of the plate portion 311 and the pole portion, reducing the weight or volume of the structural parts, improving the energy density of the battery, and thus improving the energy density of the battery pack, and simplifying the assembly cost of the battery pack.

[0076] According to another specific embodiment of the present application, a vehicle is provided. The vehicle includes a lithium-ion battery, and the lithium-ion battery is the lithium-ion battery in the above embodiment.

[0077] In an embodiment of the present application, the negative electrode cover 32 is integrally formed on the housing 10, reducing the number of independent components, simplifying the battery structure, and reducing the number of independent components; the negative electrode plate 31 includes a plate portion 311 and a pole portion, and the plate portion 311 is connected to the negative electrode tab 22. That is, the negative electrode plate 31 is an integrally formed structure, and there is no need for assembly connection between the plate portion 311 and the pole portion, further reducing the number of independent components. The lithium-ion battery in the above scheme, through the integration of the housing 10 and the negative electrode cover 32, and the integration of the plate portion 311 and the pole portion, reduces the number of battery parts and assembly processes, reduces the weight or volume of structural parts, improves the energy density of the battery, and thus reduces the manufacturing cost of the vehicle.

[0078] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0079] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0080] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A lithium-ion battery, characterized in that: include: A housing (10), the housing (10) being provided with a receiving cavity, the receiving cavity having a first opening and a second opening arranged opposite to each other; A battery cell (20), the battery cell (20) being disposed in the accommodating cavity, the battery cell (20) having a positive electrode tab (21) and a negative electrode tab (22); A negative electrode assembly (30), the negative electrode assembly (30) being arranged at the first opening, the negative electrode assembly (30) comprising a negative electrode cover (32) and a negative electrode plate (31), the negative electrode cover (32) being integrally formed on the housing (10), the negative electrode plate (31) comprising a plate portion (311) and a pole portion, the plate portion (311) being connected to the negative electrode tab (22), and at least a portion of the pole portion extending out of the accommodating cavity after passing through the negative electrode cover (32); A positive electrode assembly (40) is provided at the second opening, and a positive electrode plate (41) of the positive electrode assembly (40) is connected to the positive electrode tab (21).

2. The lithium-ion battery according to claim 1, wherein The pole portion includes: A first pole segment (312), the first pole segment (312) being integrally formed at a first end surface of the pole plate portion (311), the first pole segment (312) extending into a central tube (23) of the battery cell (20); A second pole segment (313), the second pole segment (313) is integrally formed at the second end surface of the pole plate portion (311), the second pole segment (313) is located outside the accommodating cavity, and the second pole segment (313) is coaxially arranged with the first pole segment (312).

3. The lithium-ion battery according to claim 2, wherein A boss (321) is provided at one end of the negative electrode cover plate (32) away from the accommodating cavity, and a through hole is provided on the boss (321). The second pole segment (313) has a first shaft segment (3131) and a second shaft segment (3132). The first shaft segment (3131) is arranged close to the first pole segment (312). The shaft diameter of the first shaft segment (3131) is larger than the shaft diameter of the second shaft segment (3132). The first shaft segment (3131) extends into the through hole.

4. The lithium-ion battery according to claim 1, wherein A first hole (3111) is provided on the end surface of the electrode plate portion (311) connected to the negative electrode tab (22).

5. The lithium-ion battery according to any one of claims 1 to 4, characterized in that The positive electrode assembly (40) further comprises: A positive electrode cover plate (42), the positive electrode cover plate (42) is provided to cover the second opening, and the positive electrode cover plate (42) is provided with a liquid injection port (421); A positive electrode adapter plate (43), the positive electrode adapter plate (43) is arranged in the accommodating cavity, the positive electrode adapter plate (43) is connected to the positive electrode plate (41), the positive electrode adapter plate (43) is provided with a third hole (431), the positive electrode plate (41) is provided with a second hole (411), and the second hole (411) and the third hole (431) are connected; An isolation and positioning ring (44), the isolation and positioning ring (44) being arranged between the positive electrode adapter plate (43) and the positive electrode cover plate (42), the isolation and positioning ring (44) being provided with a fourth hole (444), the fourth hole (444) being respectively connected to the liquid injection port (421) and the third hole (431); A positive electrode column (45), the positive electrode column (45) sequentially passes through the positive electrode cover (42), the isolation positioning ring (44), the positive electrode adapter plate (43) and the positive electrode plate (41), a portion of the positive electrode column (45) extends into the central tube (23) of the battery cell (20), and a portion of the positive electrode column (45) is located outside the accommodating cavity; A positive pole sleeve (46) is sleeved on the positive pole (45), and the positive pole sleeve (46) is arranged between the positive pole (45) and the positive pole cover (42).

6. The lithium-ion battery according to claim 5, characterized in that The end of the positive electrode plate (41) away from the positive electrode tab (21) is provided with a flange (412), and the flange (412) is arranged along the circumference of the positive electrode plate (41) so that the flange (412) is surrounded to form a receiving groove, and a portion of the positive electrode adapter plate (43) extends into the receiving groove, and the inner wall of the flange (412) is connected to the outer wall of the positive electrode adapter plate (43), and the flange (412) is provided with a plurality of notches (4121), and the notches (4121) are connected to the gap between the outer wall of the battery cell (20) and the shell (10).

7. The lithium-ion battery according to claim 5, characterized in that The isolation positioning ring (44) includes: A first isolation ring (441), wherein the first isolation ring (441) is an annular structure; a second isolation ring (442), the second isolation ring (442) being an annular structure, the second isolation ring (442) being coaxially arranged with the first isolation ring (441), and the second isolation ring (442) being located outside the first isolation ring (441); Connecting ribs (443), the connecting ribs (443) are multiple, the multiple connecting ribs (443) are arranged at intervals along the circumference of the second isolation ring (442), and the multiple connecting ribs (443) are connected between the first isolation ring (441) and the second isolation ring (442), so that the multiple fourth channels (444) are formed between the first isolation ring (441) and the second isolation ring (442); The second isolation ring (442) is provided with a plurality of grooves (4421), the plurality of grooves (4421) are arranged at intervals along the circumference of the second isolation ring (442), and the grooves (4421) communicate with the gap between the outer wall of the battery core (20) and the shell (10).

8. The lithium-ion battery according to claim 5, characterized in that The isolation positioning ring (44) includes: A first isolation ring (441), wherein the first isolation ring (441) is an annular structure; A second isolation ring (442), wherein the second isolation ring (442) is a fan-shaped structure, and there are at least two second isolation rings (442), each of which is connected to the outer wall of the first isolation ring (441), and the fourth hole (444) is formed between the second isolation ring (442) and the first isolation ring (441), and a fifth hole (445) is formed between two adjacent second isolation rings (442), and the fifth hole (445) is connected to the gap between the outer wall of the battery cell (20) and the shell (10).

9. A battery pack comprising at least one lithium-ion battery, characterized in that: The lithium-ion battery is the lithium-ion battery according to any one of claims 1 to 8.

10. A vehicle comprising a lithium-ion battery, characterized in that: The lithium-ion battery is the lithium-ion battery according to any one of claims 1 to 8.

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