Cell assemblies, battery modules, and battery packs

Abstract

By sealing and connecting a sealed insulating cover to the cell, an additional protective structure can be formed above the insulating ring. In the event of thermal runaway in the cell, even if high-temperature gas from inside the cell body is released through a burnt and melted insulating ring, the sealed insulating cover prevents the high-temperature gas from being released to the outside from the first end face where the electrode posts are located, thus preventing the electrode posts from flying out and reducing the damage that the high-temperature gas can inflict on the electrode posts and external circuits. This provides a cell assembly, battery module, and battery pack. [Solution] The cell assembly includes a cell and a sealed insulation unit. The cell includes a cell body, the first end face of the cell body is provided with a protruding electrode post, and an insulating ring is provided between the first end face and the electrode post. The sealed insulation unit includes a sealed insulation cover that is sealed between the first end face and the electrode post, and the sealed insulation cover covers the insulating ring.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and more particularly, to cell assemblies, battery modules, and battery packs.

Background Art

[0002] Generally, a cell (including a cylindrical cell and a prismatic cell) includes a housing used to form the cell body and an electrode post protruding from the housing. The housing may be used as the negative electrode of the cell, and the electrode post may be used as the positive electrode of the cell. In order to prevent a short circuit between the positive electrode and the negative electrode of the cell, an insulating ring surrounding the periphery of the electrode post is provided between the electrode post and the housing.

[0003] When thermal runaway occurs in the cell, the high-temperature gas inside the cell may be discharged to the outside from the position where the insulating ring is provided, which poses a potential risk in terms of safety.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of this, an object of the present invention is to provide a cell assembly, a battery module, and a battery pack that at least partially solve the problem of potential risks to the safety of the battery pack caused by the discharge of high-temperature gas near the electrode post of the cell.

Means for Solving the Problems

[0005] Based on the above object, a first aspect of the present invention provides a cell assembly. The cell assembly includes a cell and a sealed insulation unit. The cell includes a cell body, and an electrode post protruding is provided on a first end face of the cell body. An insulating ring is provided between the first end face and the electrode post. The sealed insulation unit includes a sealed insulation cover that sealingly connects between the first end face and the electrode post, and the sealed insulation cover covers the insulating ring.

[0006] Optionally, the insulating ring is annular in shape surrounding the electrode post and fitted to the first end face. The sealing insulating cover and the cell are sealed together on the inside and outside of the insulating ring along the radial direction of the insulating ring, such that a sealed space is formed between the sealing insulating cover and the cell, covering the insulating ring.

[0007] Optionally, the sealed insulating cover is sealed to the first end face of the cell body, thereby forming an annular outer sealed region continuous with the outside of the insulating ring. The sealed insulating cover is sealed to the electrode post, thereby forming an annular inner sealed region continuous with the inside of the insulating ring.

[0008] Optionally, the end protruding from the first end face of the electrode post is defined as the top end of the electrode post. The sealing insulating cover is sealed and connected to the top end of the electrode post, thereby forming the internal sealed region.

[0009] Optionally, a retractable through-hole is provided near the top end of the electrode post in the sealed insulating cover. The top end of the electrode post is exposed to the outside through the retractable through-hole.

[0010] Optionally, the end of the sealing insulating cover closest to the first end face is designated as the bottom end of the sealing insulating cover. The sealing insulating cover is provided with a sealing flange on the outer periphery of the bottom end. Both the sealing flange and the bottom end of the sealing insulating cover are sealed and connected to the first end face, thereby forming the outer sealed region.

[0011] Optionally, the sealed insulating cover has a high-temperature resistant structure.

[0012] Optionally, the sealed insulating cover is sealed and connected to the cell via a high-temperature resistant connecting layer.

[0013] Optionally, the cell assembly includes at least two of the cells. The sealed insulating unit further includes a connecting beam. The connecting beam connects to at least two of the sealed insulating covers.

[0014] Optionally, the connecting beam is connected to the first end face of the cell body.

[0015] Optionally, the cell assembly further includes a current collection busbar, and the electrode posts are electrically connected to the current collection busbar. An insulating layer is connected to the side of the current collection busbar facing the cell body, and the sealing insulating cover is connected to the insulating layer.

[0016] Optionally, the insulating layer and the sealing insulating cover are constructed as a single molded structure.

[0017] Optionally, the cell may include a cylindrical cell.

[0018] Based on the same inventive concept, a second embodiment of the present invention further provides a battery module, which includes the cell assembly of the first embodiment.

[0019] Based on the same inventive concept, a third aspect of the present invention provides a battery pack, which includes the cell assembly of the first aspect. [Effects of the Invention]

[0020] From the above, it can be seen that the cell assembly, battery module, and battery pack provided by the present invention can form an additional protective structure above the insulating ring by sealing and connecting a sealed insulating cover to the cell. In the event of thermal runaway in the cell, even if high-temperature gas from inside the cell body is released from the burnt and melted insulating ring, the sealed insulating cover prevents the high-temperature gas from inside the cell from being released to the outside from the first end face where the electrode posts are located, thereby preventing the electrode posts from flying out and reducing the damage that the high-temperature gas can inflict on the electrode posts and external circuits. [Brief explanation of the drawing]

[0021] To more clearly explain the technical solutions in the embodiments of the present invention or related technologies, the accompanying drawings that need to be used in the description of the embodiments or related technologies are briefly introduced below. The drawings described below are only some embodiments of the present invention, and it is obvious that those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0022] [Figure 1] It is a cross-sectional view of a cell according to an embodiment of the present invention. [Figure 2] It is a top view of a cell according to an embodiment of the present invention. [Figure 3] It is a partial perspective view of a cell assembly according to an embodiment of the present invention. [Figure 4] It is a partial top view of a cell assembly according to an embodiment of the present invention. [Figure 5] It is a cross-sectional view taken along A-A in FIG. 4. [Figure 6] It is a partial exploded view of a cell assembly according to an embodiment of the present invention. [Figure 7] It is a structural diagram of a sealed insulation cover of a cell assembly according to an embodiment of the present invention. [Figure 8] It is another partial structural diagram of a cell assembly according to an embodiment of the present invention. [Figure 9] It is a partial front view of another structure of a cell assembly according to an embodiment of the present invention.

Embodiments for Carrying out the Invention

[0023] For a clearer understanding of the object, technical solution, and advantages of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings in combination with specific embodiments.

[0024] It should be noted that the relative arrangements, numerical expressions, and numerical values of the members described in these embodiments do not limit the scope of the present invention unless specifically described otherwise.

[0025] At the same time, please understand that the dimensions of each part shown in the drawings are not depicted according to actual proportions, for the sake of clarity.

[0026] The following description of at least one exemplary embodiment is essentially illustrative and does not limit the invention or its applications or uses.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of the present invention have the ordinary meanings understood by those skilled in the art to which the invention pertains. The terms "first," "second," and similar terms used in the embodiments of the present invention do not indicate order, quantity, or importance, but are used solely to distinguish different components. Similar terms such as "includes" or "contains" mean that the component or article preceding the term includes, but does not exclude, the component or article and its equivalents described after the term. Similar terms such as "connect" or "connect to each other" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "up," "down," "left," and "right" are used solely to indicate relative positional relationships, and if the absolute position of the object being described changes, the relative positional relationship may change accordingly.

[0028] Cell 100 may include cylindrical cells and / or rectangular cells. A cylindrical cell will be used as an example for illustrative purposes.

[0029] Figure 1 shows a cross-sectional view of cell 100. Cell 100 may include a cylindrical cell body 110. The cell body 110 includes a housing and a bare cell attached to the housing, and an electrode post 120 is provided at the top of the cell body 110. Part of the electrode post 120 is located inside the housing and is electrically connected to the bare cell. The other part extends from the top of the cell body 110.

[0030] Figure 2 shows a top view of cell 100. To maintain insulation between the electrode post 120 and the housing of the cell body 110, an insulating ring 130 (or insulating pad) is provided between the electrode post 120 and the housing. The insulating ring 130 surrounds the electrode post 120 and separates the electrode post 120 from the housing along the circumferential direction of the electrode post 120.

[0031] As an example, as shown in Figure 2, the insulating ring 130 may be in close contact with the circumferential outer wall of the electrode post 120.

[0032] Taking the application of cell 100 to a battery pack as an example, the electrode posts 120 of multiple cells 100 in the battery pack are simultaneously electrically connected to an integrated busbar (Cells Contact System, CSS). If thermal runaway occurs in a single cell 100, the high-temperature gas generated inside the housing carries fine particles that need to be expelled from the housing. If the high-temperature gas and fine particles enter the connection area between the electrode post 120 and the integrated busbar, an arc discharge may occur at the top of the cell body 110, which can cause thermal runaway to occur in other normal cells 100 and spread the heat.

[0033] To mitigate the aforementioned potential safety risks, an explosion-proof valve 140 is provided at the bottom of the cell body 110, as shown in Figure 1. If thermal runaway occurs in the cell 100, the high-temperature gas generated inside will open the explosion-proof valve 140, allowing the high-temperature gas to be discharged from the bottom of the cell body 110. This prevents undesirable effects on the electrode post 120 at the top of the cell body 110, and allows the cell 100 to function as a thermoelectric separation structure.

[0034] However, the applicant's research found that if thermal runaway occurs in cell 100, there is a risk that the insulating ring 130 between the electrode post 120 and the housing will melt due to the heat. After the insulating ring 130 burns and melts, a gap leading to the inside of the housing will appear where the insulating ring 130 originally was located, and high-temperature gas from inside the housing may be discharged from the top of the cell body 110 through this gap, thereby creating a potential safety risk.

[0035] Figure 3 shows a partial perspective view of the cell assembly. To solve the problems described above, the cell assembly of this embodiment, as shown in Figure 3, includes a cell 100 and a sealing insulation unit 200. The cell 100 includes a cell body 110, and a protruding electrode post 120 is provided on the first end face 111 of the cell body 110. Figure 4 shows a partial top view of the cell assembly. As shown in Figure 4, the sealing insulation unit 200 includes a sealing insulation cover 210 that seals between the first end face 111 and the electrode post 120. Figure 5 shows a cross-sectional view of AA in Figure 4. As shown in Figure 5, the sealing insulation cover 210 covers the insulation ring 130.

[0036] For example, the sealed insulating cover 210 may be a integrally molded structure in order to ensure its own sealing performance.

[0037] For example, the first end face 111 may be the top surface of the cell body 110.

[0038] For example, a sealed connection may be achieved between the sealed insulating cover 210 and the cell 100 by a method such as a sealant connection.

[0039] For example, the sealed insulating cover 210 may be sealed to the first end face 111 and may also be sealed to the electrode post 120. Since the material of the sealed insulating cover 210 is an insulating material, even if the sealed insulating cover 210 is connected to the cell body 110 and the electrode post 120 at the same time, it will not cause a short circuit in the cell 100.

[0040] The sealed insulating cover 210 is positioned above the first end face 111 and covers the insulating ring 130, forming an additional protective structure above the insulating ring 130. In the event of thermal runaway in the cell 100, even if the insulating ring 130 burns and melts, the sealed insulating cover 210 can block the hot gas overflowing from the insulating ring 130 and prevent the electrode post 120 from flying out, thereby reducing the impact of the hot gas on the electrical connection between the electrode post 120 and the external circuit.

[0041] The cell assembly provided in this embodiment can form an additional protective structure above the insulating ring 130 by sealing and connecting a sealed insulating cover 210 to the cell 100. If thermal runaway occurs in the cell 100, even if high-temperature gas from inside the cell body 110 is released from the burnt and melted insulating ring 130, the sealed insulating cover 210 will block it, preventing the high-temperature gas from inside the cell 100 from being released to the outside from the first end face 111 where the electrode post 120 is located, thereby reducing the damage that the high-temperature gas can inflict on the electrode post and the external circuit.

[0042] As shown in Figure 2, the insulating ring 130 has an annular shape that surrounds the electrode post 120 and is fitted onto the first end face 111. As shown in Figure 5, the sealing insulating cover 210 is sealed and connected to the cell 100 and the insulating ring 130 on the inside and outside, along the radial direction of the insulating ring 130 (the X direction in Figure 5), so that a sealed space 300 is formed that surrounds the insulating ring 130 and the sealing insulating cover 210 and the cell 100.

[0043] The sealed insulating cover 210 straddles the insulating ring 130 and achieves complete coverage of the insulating ring 130 by making sealed connections to the cell 100 on both the inside and outside sides of the insulating ring 130, thereby forming a sealed space 300 above the insulating ring 130. If the insulating ring 130 burns and melts, and the hot gas inside the cell body 110 is released from the position where the insulating ring 130 originally was, the sealed insulating cover 210 can confine the hot gas to the sealed space 300, further preventing the hot gas from being released to the outside, and further protecting the electrical connection between the electrode post 120 and the external circuit.

[0044] As shown in Figure 5, in some embodiments, the sealed insulating cover 210 is sealed to the first end face 111 of the cell body 110, thereby forming an annular outer sealed region 400 that is continuous with the outside of the insulating ring 130. The sealed insulating cover 210 is sealed to the electrode post 120, thereby forming an annular inner sealed region 500 that is continuous with the inside of the insulating ring 130.

[0045] For example, the sealing insulating cover 210 may be sealed to the end of the electrode post 120, and the end of the electrode post 120 may have a relatively flat surface. The sealed connection between the sealing insulating cover 210 and the flat surface ensures that the formed internal sealed region 500 has a desirable sealing effect. Naturally, by sealing the sealing insulating cover 210 to the circumferential side wall of the electrode post 120, the shielding of the sealing insulating cover 210 to the end of the electrode post 120 is reduced, leaving a relatively large open area at the end of the electrode post 120, which is convenient for electrical connection between the electrode post 120 and the external circuit.

[0046] For example, based on the radial cross-sectional shape of the electrode post 120, the outer sealing region 400 and the inner sealing region 500 may be multi-sided annular regions or circular annular regions.

[0047] Both the outer sealed region 400 and the inner sealed region 500 are continuous and closed annular regions, thus avoiding the formation of a passage connecting the sealed space 300 to the outside world along the radial direction of the electrode post 120, restricting the high-temperature gas in the sealed space 300 between the outer sealed region 400 and the inner sealed region 500, and effectively preventing the high-temperature gas from being discharged to the outside through the gap between the sealed insulating cover 210 and the cell 100.

[0048] As shown in Figure 5, in some embodiments, the end protruding from the first end face 111 of the electrode post 120 is defined as the top end of the electrode post 120. The sealed insulating cover 210 is sealed and connected to the top end of the electrode post 120, thereby forming an internal sealed region 500.

[0049] For example, the center of the internal sealing region 500 coincides with the center of the apex of the electrode post 120, ensuring a uniform distribution of the internal sealing region 500 around the apex of the electrode post 120, thereby further guaranteeing the sealing performance at each position of the internal sealing region 500.

[0050] We will explain this as an example of achieving a sealed connection between the sealed insulating cover 210 and the electrode post 120 using a sealant connection method.

[0051] When a fluid adhesive is used, the top end of the electrode post 120 may have a relatively flat surface, and after applying the fluid adhesive to the top end of the electrode post 120, it can be more preferably held in the applied position, and after the fluid adhesive has cured, a good seal can be provided between the sealing insulating cover 210 and the electrode post 120.

[0052] At the same time, forming the internal sealing region 500 at the top end of the electrode post 120 allows for control of the area of ​​the internal sealing region 500 by adjusting the diameter of the top opening of the sealing insulating cover 210, thereby enhancing the sealing effect inside the insulating ring 130, resulting in low adjustment costs and advantages for mass production.

[0053] Figure 6 shows a partially exploded view of the cell assembly. In some embodiments, a retractable through-hole 211 is provided near the top of the electrode post 120 of the sealing insulating cover 210. The top of the electrode post 120 is exposed to the outside through the retractable through-hole 211.

[0054] For example, the radial cross-sectional shape of the retractable through-hole 211 and the shape of the top surface of the electrode post 120 are identical, and the diameter of the retractable through-hole 211 is less than the diameter of the top surface of the electrode post 120.

[0055] For example, the external circuit and the portion of the electrode post 120 that is exposed to the outside may be electrically connected by welding or by a conductive adhesive.

[0056] Providing the retractable through-hole 211 on the sealed insulating cover 210 exposes a portion of the surface of the top of the electrode post 120 to the outside, which is convenient for electrical connection between the electrode post 120 and the external circuit.

[0057] As shown in Figure 5, in some embodiments, the end of the sealed insulating cover 210 closest to the first end face 111 is made the bottom end of the sealed insulating cover 210, and a sealing flange 212 is provided surrounding the outer peripheral edge of the bottom end of the sealed insulating cover 210. Both the sealing flange 212 and the bottom end of the sealed insulating cover 210 are sealed and connected to the first end face 111, thereby forming an outer sealed region 400.

[0058] As an example, Figure 7 shows a structural diagram of the sealed insulating cover 210. By making the bottom surface of the sealing flange 212 horizontal to the bottom end surface of the sealed insulating cover 210, it is possible to ensure that the gap distance between the sealing flange 212 and the first end face 111 is the same as the gap distance between the bottom end of the sealed insulating cover 210 and the first end face 111. When connecting the sealed insulating cover 210 and the first end face 111, it is possible to form a structural layer that has a relatively uniform thickness and relatively good sealing properties.

[0059] The structure of the sealed insulating cover 210 will be further explained using the structures shown in Figures 5 and 6 as an example. The sealed insulating cover 210 includes an annular, flaky structure located above the top of the electrode post 120. This flaky structure is sealed to the top of the electrode post 120, forming an internal sealed region 500. A cylindrical structure is provided along the outer peripheral edge of the flaky structure, extending toward the first end face 111. The end of the cylindrical structure furthest from the flaky structure is the bottom end of the sealed insulating cover 210. To increase the area of ​​the external sealed region 400, this embodiment provides a sealing flange 212 along the outer peripheral edge of the bottom end of the sealed insulating cover 210. Since both the bottom ends of the sealing flange 212 and the sealing insulating cover 210 are sealed and connected to the first end face 111, the outer sealed region 400 includes not only the region covered by the bottom end of the sealing insulating cover 210 in the orthographic projection of the first end face 111, but also the region covered by the sealing flange 212 in the orthographic projection of the first end face 111. The relatively large area of ​​the outer sealed region 400 enhances the sealing effect on the outside of the insulating ring 130 and helps prevent the release of high-temperature gas from inside the sealed space 300 to the outside.

[0060] In some embodiments, the sealed insulating cover 210 is sealed and connected to the cell 100 through a high-temperature resistant connecting layer.

[0061] For example, the high-temperature resistant connecting layer may be a structural layer formed with a high-temperature resistant solid adhesive, or a structural layer formed after a high-temperature resistant fluid adhesive has cured.

[0062] In this embodiment, the outer sealed region 400 and the inner sealed region 500 can form a reliable sealed structure at room temperature. Furthermore, even when a high-temperature gas is contained in the sealed space 300, or after the temperature of the first end face 111 rises, the sealed structure of the outer sealed region 400 and the inner sealed region 500 still has a favorable sealing effect in a high-temperature environment, thereby preventing the high-temperature gas from being discharged from the sealed space 300 to the outside.

[0063] In some embodiments, the sealed insulating cover 210 has a high-temperature resistant structure.

[0064] For example, the material of the sealed insulating cover 210 may be mica or high-temperature resistant silicone rubber, etc.

[0065] In addition to ensuring the sealing performance of the outer sealed area 400 and the inner sealed area 500, it is also necessary to ensure that the sealing insulating cover 210 itself maintains desirable sealing performance in a high-temperature environment. For this reason, in this embodiment, the sealing insulating cover 210 is made of a high-temperature resistant material, thereby preventing the sealing insulating cover 210 from deforming in a high-temperature environment and releasing high-temperature gas to the outside from the sealed space 300.

[0066] Figure 8 shows another partial structural diagram of the cell assembly. In some embodiments, the cell assembly includes at least two cells 100. The sealed insulation unit 200 further includes a connecting beam 220. The connecting beam 220 connects to at least two sealed insulation covers 210.

[0067] For example, the material of the connecting beam 220 may be the same as or different from the material of the sealed insulating cover 210.

[0068] For example, the connecting beam 220 and the sealed insulating cover 210 may be connected by integral molding, welding, insert connection, engagement connection, adhesive connection, or fastening member connection, etc.

[0069] For example, the connecting beam 220 may be connected to at least one of the circumferential side walls of the cylindrical structure of the sealed insulating cover 210, the circumferential side walls of the sealed flange 212, and the top plane of the sealed flange 212.

[0070] Combining Figure 5, a gap exists between the sealing insulating cover 210 and the circumferential side wall of the electrode post 120 along the radial direction of the cell body 110 (the X direction in Figure 5) (this gap is used to form a sealed space 300). Therefore, there is a possibility of misalignment when the sealing insulating cover 210 is attached to the cell 100. If misalignment occurs between the sealing insulating cover 210 and the cell 100, a portion of the insulating ring 130 may be exposed from the sealing insulating cover 210, which may lead to a sealing failure of the sealing insulating cover 210.

[0071] To avoid the problems described above, it is necessary to ensure that the cell 100 and the sealed insulating cover 210 are maintained in predetermined positions. In this embodiment, at least two sealed insulating covers 210 are connected to one by a connecting beam 220. Compared to providing multiple sealed insulating covers 210 independently, the connecting beam 220 can provide a certain positional limiting effect to the sealed insulating covers 210, preventing the sealed insulating covers 210 and the cell 100 from being misaligned and helping to ensure the sealing effect of the sealed insulating covers 210.

[0072] As shown in Figure 8, in some embodiments, the connecting beam 220 is connected to the first end face 111 of the cell body 110.

[0073] For example, the connection method between the connecting beam 220 and the first end face 111 may be the same as the connection method between the sealed insulating cover 210 and the first end face 111.

[0074] For example, to facilitate the connection between the connecting beam 220 and the first end face 111, the connecting beam 220 may be connected to the circumferential side wall of the sealing flange 212, thereby bringing the connecting beam 220 closer to the first end face 111.

[0075] The connecting beam 220 connects to the first end face 111 of the cell body 110, and the stress generated between them helps the sealing insulating cover 210 and the first end face 111 to maintain a reliable sealed connection.

[0076] Figure 9 shows a partial front view of another structure of the cell assembly. In some embodiments, the cell assembly further includes a current collection busbar 700. Electrode posts 120 are electrically connected to the current collection busbar 700. An insulating layer 600 is connected to the side of the current collection busbar 700 facing the cell body 110, and a sealing insulating cover 210 is connected to the insulating layer 600.

[0077] For example, the insulating layer 600 and the sealing insulating cover 210 are formed as a single molded structure. Naturally, the sealing insulating cover 210 and the insulating layer 600 may be connected by welding, insert connection, engagement connection, adhesive connection, or fastening member connection, etc.

[0078] For example, the current collection busbar 700 and the portion of the electrode post 120 that is exposed to the outside may be electrically connected by welding or conductive adhesive.

[0079] One point to understand is that the current collection busbar 700 needs to connect multiple cells 100, so the area of ​​the current collection busbar 700 is relatively large. Correspondingly, the connection area between the insulating layer 600 and the current collection busbar 700 is also relatively large, and therefore the reliability of the connection between the two is relatively good. At the same time, the current collection busbar 700 is connected to the electrode post 120 of each cell 100, and therefore the relative positional stability between the current collection busbar 700 and the electrode post 120 of each cell 100 is also relatively good, and the probability of planar misalignment occurring is relatively low. For this reason, in this embodiment, the sealed insulating cover 210 and the insulating layer 600 are connected integrally. When the relative positional stability between the current collection busbar 700 and the cells 100, and between the current collection busbar 700 and the insulating layer 600 is good, the relative positional stability between the sealed insulating cover 210 connected to the insulating layer 600 and the cells 100 connected to the current collection busbar 700 is also good. This ensures that a predetermined position can be maintained between the cell 100 and the sealed insulating cover 210, avoiding misalignment between the cell 100 and the sealed insulating cover 210, and helping to ensure the airtightness of the sealed insulating cover 210.

[0080] Based on the same inventive concept, and combining the descriptions of the cell assemblies in each of the embodiments described above, this embodiment provides a battery module. This battery module achieves the technical effects corresponding to the cell assemblies in each of the embodiments described above, and will not be described again here.

[0081] The battery module includes the cell assemblies of each embodiment described above.

[0082] Based on the same inventive concept, and combining the descriptions of the cell assemblies in each of the embodiments described above, this embodiment provides a battery pack. This battery pack achieves the technical effects corresponding to the cell assemblies in each of the embodiments described above, and will not be described again here.

[0083] The battery pack includes the cell assemblies of each embodiment described above.

[0084] It should be noted that the above describes several embodiments of the present invention. Other embodiments are within the scope of the appended claims. In some circumstances, the operations or steps described in the claims may be performed in a different order than those described in the embodiments above, and the desired results can still be achieved. Furthermore, the processes depicted in the accompanying drawings do not necessarily have to be performed in the specific illustrated order or sequential order to obtain the desired results. In certain embodiments, multitasking and parallel processing may be possible or advantageous.

[0085] The various embodiments of the present invention are all described step by step, with each embodiment focusing on its differences from the others. Parts that are identical or similar between the various embodiments can be referenced to one another.

[0086] The description of the present invention is provided for illustrative and explanatory purposes only and is not exhaustive, nor does it limit the invention to the disclosed forms. It will be apparent to those skilled in the art that many modifications and changes are possible. The embodiments have been selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the invention and design each embodiment with modifications suitable for specific applications.

[0087] Those skilled in the art will understand that the above description of any embodiments is merely illustrative and does not mean that the scope of the present invention is limited to these examples. In the concept of the present invention, the technical features of the above embodiments or different embodiments can be combined, the steps can be carried out in any order, and many other variations exist of the above embodiments of the present invention, but are not described in detail for the sake of brevity.

[0088] Although the present invention has been described in relation to specific embodiments, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.

[0089] Embodiments of the present invention are intended to encompass all substitutions, modifications, and variations that fall within the broad scope of the invention. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the invention should be included within the scope of protection of the invention. [Industrial applicability]

[0090] The cell assembly, battery module, and battery pack of the present invention are applicable to the technical field of power batteries. [Explanation of Symbols]

[0091] 100: Cell 110: Cell body 111: First end surface 120: Electrode Post 130: Insulating ring 140: Explosion-proof valve 200: Sealed Insulation Unit 210: Sealed insulating cover 211: Retractable through hole 212: Sealed flange 220: Connecting beam 300: Sealed space 400:Outer sealed area 500: Inner sealed area 600: Insulating layer 700: Current collection bus bar

Claims

1. A cell including a cell body, wherein a protruding electrode post is provided on the first end face of the cell body, and an insulating ring is provided between the first end face and the electrode post, A sealed insulating unit including a sealed insulating cover that seals between the first end face and the electrode post, wherein the sealed insulating cover covers the insulating ring, and the sealed insulating unit and including A cell assembly characterized by the following features.

2. The insulating ring has an annular shape that surrounds the electrode post and is fitted onto the first end face. The sealing insulating cover and the cell are sealed together on the inside and outside of the insulating ring, along the radial direction of the insulating ring, such that a sealed space is formed between the sealing insulating cover and the cell, covering the insulating ring. The cell assembly according to claim 1, characterized in that

3. The sealed insulating cover is sealed and connected to the first end face of the cell body, thereby forming a continuous annular outer sealing region on the outside of the insulating ring. The sealed insulating cover, by being sealed and connected to the electrode post, forms a continuous annular internal sealed region inside the insulating ring. The cell assembly according to claim 2, characterized in that

4. The end of the electrode post protruding from the first end face is defined as the top end of the electrode post, and the sealing insulating cover is sealed and connected to the top end of the electrode post, thereby forming the internal sealed region. The cell assembly according to claim 3, characterized in that

5. A retractable through-hole is provided near the top end of the electrode post in the sealed insulating cover, and the top end of the electrode post is exposed to the outside through the retractable through-hole. The cell assembly according to claim 4, characterized in that

6. The end of the sealing insulating cover closest to the first end face is defined as the bottom end of the sealing insulating cover, and the sealing insulating cover is provided with a sealing flange along the outer peripheral edge of the bottom end. The sealing flange and the bottom end of the sealing insulating cover are both sealed and connected to the first end face, thereby forming the outer sealed area. The cell assembly according to claim 3, characterized in that

7. The aforementioned sealed insulating cover has a high-temperature resistant structure. The cell assembly according to claim 1, characterized in that

8. The sealed insulating cover is sealed and connected to the cell via a high-temperature resistant connecting layer. The cell assembly according to claim 1, characterized in that

9. The cell assembly includes at least two of the cells, The sealed insulating unit further includes a connecting beam, the connecting beam being connected to at least two of the sealed insulating covers. The cell assembly according to claim 1, characterized in that

10. The connecting beam connects to the first end face of the cell body. The cell assembly according to claim 9, characterized in that

11. The cell assembly further includes a current collection busbar, and the electrode post is electrically connected to the current collection busbar. An insulating layer is connected to the side of the current collector busbar facing the cell body, and the sealing insulating cover is connected to the insulating layer. The cell assembly according to claim 9, characterized in that

12. The insulating layer and the sealing insulating cover are formed in an integrally molded structure. The cell assembly according to claim 11, characterized in that

13. The aforementioned cells include cylindrical cells. The cell assembly according to claim 1, characterized in that

14. Includes a cell assembly according to any one of claims 1 to 13 A battery module characterized by the following features.

15. Includes a cell assembly according to any one of claims 1 to 13 A battery pack characterized by the following features.

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