Battery and battery pack

Abstract

This invention relates to the field of battery technology and proposes a battery and a battery pack. The battery includes: a battery casing; and a battery cell located inside the battery casing. A protrusion is provided on the inner surface of the battery casing near the battery cell to prevent electrical connection between the battery casing and the battery cell. By providing the protrusion inside the battery casing, the protrusion can isolate the battery cell from conductive foreign objects, thereby preventing conductive foreign objects from forming an electrical connection between the battery casing and the battery cell through the protrusion. This improves the battery's safety performance and avoids the risk of battery short circuits.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery and a battery pack. Background Technology

[0002] In related technologies, the casing and cover are insulated from the battery cell by an insulating film. However, since an insulating film cannot be placed at the welded joints of the casing and cover, the insulating film does not cover the entire casing and cover, posing a significant risk of short circuit. Summary of the Invention

[0003] This invention provides a battery and a battery pack to improve battery performance.

[0004] According to a first aspect of the present invention, a battery is provided, comprising:

[0005] Battery casing;

[0006] The battery cell is located inside the battery casing.

[0007] The battery casing has a protrusion on its inner surface near the battery cell to prevent the battery casing from being electrically connected to the battery cell.

[0008] The battery of this invention includes a battery casing and a battery cell. The battery cell is located inside the battery casing. By providing a protrusion inside the battery casing, the protrusion can be used to isolate the battery cell from conductive foreign objects, thereby preventing conductive foreign objects from forming an electrical connection between the battery casing and the battery cell through the protrusion. This can improve the safety performance of the battery and avoid the risk of battery short circuit.

[0009] According to a second aspect of the present invention, a battery pack is provided, comprising the battery described above.

[0010] The battery pack of this invention includes a battery, which includes a battery casing and a battery cell. The battery cell is located inside the battery casing. By providing a protrusion inside the battery casing, the protrusion can be used to isolate the battery cell from conductive foreign objects, thereby preventing conductive foreign objects from forming an electrical connection between the battery casing and the battery cell through the protrusion. This can improve the safety performance of the battery and avoid the risk of battery short circuit. Attached Figure Description

[0011] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0012] Figure 1This is a schematic diagram of the internal structure of a battery according to an exemplary embodiment;

[0013] Figure 2 This is a schematic diagram of the internal structure of a battery according to another exemplary embodiment;

[0014] Figure 3 This is a schematic diagram of the structure of a battery according to an exemplary embodiment;

[0015] Figure 4 This is a schematic diagram of a partial structure of a battery according to an exemplary embodiment;

[0016] Figure 5 This is a schematic diagram of another partial structure of a battery according to an exemplary embodiment;

[0017] Figure 6 This is an exploded partial structural schematic diagram of a battery casing according to an exemplary embodiment;

[0018] Figure 7 This is another exploded partial structural schematic diagram of a battery casing according to an exemplary embodiment;

[0019] Figure 8 This is a partial structural schematic diagram of a battery according to an exemplary embodiment;

[0020] Figure 9 This is a schematic diagram of the structure of a protrusion in a battery according to an exemplary embodiment.

[0021] The annotations in the attached figures are explained as follows:

[0022] 10. Battery casing; 11. Protrusion; 111. Weak part; 12. Connection area; 121. Gap; 13. Groove; 14. First casing component; 141. First flange edge; 15. Second casing component; 151. Second flange edge; 16. Flange structure; 17. First surface; 18. Second surface; 19. Recess; 20. Battery cell; 21. Battery cell body; 22. Tab; 23. Terminal assembly; 30. Insulation part. Detailed Implementation

[0023] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0024] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0025] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0026] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0027] One embodiment of the present invention provides a battery, please refer to... Figures 1 to 9 The battery includes: a battery casing 10; and a battery cell 20 located inside the battery casing 10. The battery casing 10 has a protrusion 11 near the inner surface of the battery cell 20 to prevent the battery casing 10 from being electrically connected to the battery cell 20.

[0028] A battery according to one embodiment of the present invention includes a battery casing 10 and a battery cell 20. The battery cell 20 is located inside the battery casing 10. By providing a protrusion 11 inside the battery casing 10, the protrusion 11 can be used to isolate the battery cell 20 from conductive foreign objects, thereby preventing conductive foreign objects from forming an electrical connection between the battery casing 10 and the battery cell 20 through the protrusion 11, thereby improving the safety performance of the battery and avoiding the risk of battery short circuit.

[0029] In one embodiment, combined Figure 8 As shown, the battery cell 20 may include a battery cell body 21 and a tab 22, with the tab 22 extending from the length of the battery cell body 21; wherein, the tab 22 is connected to the terminal assembly 23, as shown. Figure 3 and Figure 4As shown, the terminal assembly 23 can be positioned at the end of the battery casing 10 for easy connection and to fully utilize the length of the battery. The tab 22 and the terminal assembly 23 can be directly connected, either by welding or by using a metal adapter. The specific connection method can be welding, riveting, or other methods; no limitation is made here.

[0030] The cell body 21 includes two or more electrode plates, and the tab 22 includes two or more individual tabs. Each individual tab extends from its corresponding electrode plate, and the width of the individual tab is smaller than the width of the electrode plate. Multiple individual tabs are stacked to form the tab 22, which is connected to the terminal assembly 23. The tab 22 can be soldered to the terminal assembly 23. The individual tabs are made of metal foil with good electrical and thermal conductivity, such as aluminum, copper, or nickel.

[0031] The protrusion 11 prevents conductive foreign objects from connecting the battery casing 10 to the tab 22 through the protrusion 11.

[0032] In some embodiments, there may be two electrode post assemblies 23, namely a positive electrode post assembly and a negative electrode post assembly, and there may also be two electrode tabs 22, namely a positive electrode tab and a negative electrode tab, with the positive electrode post assembly and the positive electrode tab connected together, and the negative electrode post assembly and the negative electrode tab connected together.

[0033] In one embodiment, a recess 19 may be provided on the battery casing 10, and the terminal assembly 23 may be disposed within the recess 19. Alternatively, as... Figures 3 to 5 As shown, the recess 19 and the terminal assembly 23 are respectively disposed on opposite sides of the battery housing 10, and the recess 19 can be used to accommodate the terminal assembly of another battery.

[0034] It should be noted that the battery casing 10 can be a metal casing, for example, an aluminum casing or a steel casing. The protrusion 11 can be a metal structure. The protrusion 11 may not be insulated, and its main function is to prevent conductive foreign objects from forming an electrical connection between the battery casing 10 and the battery cell 20. Therefore, the protrusion 11, as a metal structure, is mainly used to block conductive foreign objects. Alternatively, the protrusion 11 can be insulated. For example, a coating, such as a coating formed of ceramic materials like alumina (Al2O3) or zirconium oxide (ZrO2), can be provided on the protrusion 11.

[0035] In one embodiment, the battery casing 10 has an edge region, and a protrusion 11 is located on the side of the cell 20 near the edge region, that is, the protrusion 11 is located between the cell 20 and the edge region, so as to prevent the battery casing 10 and the cell 20 from being connected through a conductive foreign object.

[0036] The edge area can be considered as the part of the battery casing 10 where the inner insulation is not attached, or as the part of the battery casing 10 where the insulation is at risk of failure. (Combined with...) Figure 1 and Figure 2 As shown, the edge region may include the connecting region 12 and the gap 121.

[0037] The battery casing 10 can be a one-piece structure, but to achieve sealing of the battery cell 20, the battery casing 10 must have a connection area 12, that is, two opposing structures are connected to form a space to accommodate the battery cell 20. Alternatively, the battery casing 10 can be formed by splicing at least two structures. In this case, the structures must be connected, thus forming the connection area 12. When connecting the structures, for example, by welding, weld slag may form conductive foreign matter. The protrusion 11 can prevent weld slag from connecting the battery cell 20 and the battery casing 10. Furthermore, to facilitate the connection between the structures, the connection area 12 is not convenient for insulation treatment. In this case, the protrusion 11 is located on the side of the battery cell 20 near the connection area 12 to prevent conductive foreign matter from forming an electrical connection between the battery cell 20 and the battery casing 10.

[0038] In one embodiment, a protrusion 11 is provided on the large surface of the battery casing 10. The protrusion 11 is located near the edge of the large surface to avoid the battery cell 20. The protrusion 11 can not only prevent the battery casing 10 from forming an electrical connection with the battery cell 20, but also limit the battery cell 20, which facilitates the installation of the battery cell 20. Furthermore, the protrusion 11 can strengthen the battery casing 10, thereby improving the strength of the battery casing 10.

[0039] It should be noted that, in combination Figures 3 to 5 As shown, the battery casing 10 includes two opposing first surfaces 17 and four second surfaces 18 surrounding the first surfaces 17. That is, the battery casing 10 has an approximately rectangular structure, and the area of ​​the first surfaces 17 is larger than the area of ​​the second surfaces 18. The two opposing first surfaces 17 are the large surfaces of the battery casing 10, while the four second surfaces 18 are the small surfaces of the battery casing 10. The four second surfaces 18 include two pairs of small surfaces: a first pair of small surfaces extending along the length direction of the battery casing 10, and a second pair of small surfaces extending along the width direction of the battery casing 10. The area of ​​the first pair of small surfaces is larger than the area of ​​the second pair of small surfaces, but both are smaller than the area of ​​the large surfaces.

[0040] A protrusion 11 is provided on the large surface of the battery housing 10. The large surface of the battery housing 10 here is the inner surface of the battery housing 10, that is, the inner surface that is disposed opposite to the first surface 17.

[0041] In one embodiment, such as Figure 6 and Figure 8 As shown, protrusions 11 are provided on both sides of the battery cell 20. The protrusions 11 are located on the same surface of the battery casing 10. The protrusions 11 can avoid the battery cell 20, which not only prevents the battery casing 10 from forming an electrical connection with the battery cell 20, but also allows the protrusions 11 to limit the battery cell 20, making it convenient to install the battery cell 20 and fixing the battery cell 20 to a certain extent.

[0042] Both sides of the battery cell 20 are provided with protrusions 11, which can also improve the structural stability of the battery casing 10. The protrusions 11 can be symmetrically arranged on the battery casing 10. The two sides of the battery cell 20 can be provided with a complete protrusion 11, or the two sides of the battery cell 20 can be provided with multiple separate protrusions 11.

[0043] In one embodiment, combined Figure 8 As shown, the battery cell 20 includes a battery cell body 21 and a tab 22. The direction in which the tab 22 extends from the side of the battery cell body 21 is slightly parallel to the extension direction of the protrusion 11, so that the protrusion 11 can limit the battery cell body 21 and effectively prevent the tab 22 from forming an electrical connection with the part of the tab 22 leading out.

[0044] The terminal assembly 23 can be disposed on the first surface 17, and the two tabs 22 extend from the two opposite sides of the cell body 21. The terminal assembly 23 and the tabs 22 form an electrical connection, that is, the tabs 22 are led out from the large surface of the battery casing 10. Furthermore, an insulating support can be provided at the connection between the terminal assembly 23 and the tabs 22. Therefore, the direction perpendicular to the direction of the tabs is more likely to fail due to insulation failure. Thus, the direction in which the tabs 22 extend from the side of the cell body 21 is slightly parallel to the extension direction of the protrusion 11, which can effectively prevent the tabs 22 from forming an electrical connection with the part in the direction of the tabs 22 leading out.

[0045] In one embodiment, such as Figure 6 and Figure 8As shown, the battery also includes an insulating portion 30, which is disposed on the battery casing 10, and the battery cell 20 is pressed onto the insulating portion 30, thereby preventing the battery cell 20 from forming an electrical connection with the battery casing 10. To facilitate the connection of the battery casing 10, the insulating portion 30 is not provided at the connection area 12. Therefore, by positioning the protrusion 11 on the side of the battery cell 20 closer to the connection area 12, it is possible to prevent the battery casing 10 and the battery cell 20 from being connected through a conductive foreign object.

[0046] In one embodiment, an insulating portion 30 may be provided on the protrusion 11, that is, an insulating portion 30 may be provided on the outer surface of the protrusion 11, thereby preventing the battery cell 20 from forming an electrical connection with the protrusion 11, thereby further improving the insulation performance of the protrusion 11. The insulating portion 30 may be an insulating film, and it is easier to assemble if an insulating film is provided on the protrusion 11. The insulating film may be provided by processes such as spraying or laminating. The insulating portion 30 may be an insulating coating, such as a coating formed of ceramic materials such as alumina (Al2O3) or zirconium oxide (ZrO2).

[0047] In one embodiment, at least a portion of the insulating portion 30 is disposed on the side of the protrusion 11 facing the cell 20, thereby preventing the cell 20 from forming an electrical connection with the protrusion 11, thereby further improving the insulation performance of the protrusion 11.

[0048] The insulating portion 30 may completely cover the protrusion 11, or the insulating portion 30 may cover a portion of the protrusion 11.

[0049] In one embodiment, the insulating portion 30 covers a portion of the protrusion 11; wherein the area of ​​the insulating portion 30 covering the protrusion 11 is not less than half of the outer surface area of ​​the protrusion 11, thereby ensuring that the insulating portion 30 can reliably insulate the battery casing 10 and the battery cell 20.

[0050] The protrusion 11 can be triangular pyramidal, and the area of ​​the insulating portion 30 covering the protrusion 11 is not less than half of the outer surface area of ​​the protrusion 11, that is, one end of the insulating portion 30 can extend beyond the apex of the triangular pyramid, such as... Figure 4 As shown.

[0051] In one embodiment, such as Figure 1 , Figure 2 as well as Figure 9 As shown, the protrusion 11 is provided with a weak part 111 so that when the internal pressure of the battery casing 10 reaches a preset value, the weak part 111 can be broken through, thereby enabling the protrusion 11 to be used as an explosion-proof valve to ensure the safety performance of the battery.

[0052] In some embodiments, the protrusion 11 and the weak portion 111 can be separate structures. For example, a through hole can be formed on the protrusion 11, and the weak portion 111 can be configured to block the through hole. The weak portion 111 can be welded to the protrusion 11, or the weak portion 111 can be bonded to the protrusion 11. Thus, during the use of the explosion-proof valve, when the internal pressure of the operating environment reaches a certain level, at least a portion of the weak portion 111 can detach from the protrusion 11, or the weak portion 111 can burst open from the middle position, thereby achieving pressure relief and ensuring the pressure relief function of the explosion-proof valve.

[0053] In one embodiment, the protrusion 11 and the weak part 111 are integrally formed, which not only simplifies the structure but also improves the molding efficiency of the explosion-proof valve.

[0054] The protrusion 11 and the weak portion 111 are integrally molded structures. For example, a portion of the protrusion 11 can be locally thinned to form the weak portion 111. The weak portion 111 can be a notch, and there can be one or more notches, to meet the explosion-proof requirements and achieve the pressure relief effect. Alternatively, the protrusion 11 can be locally thinned during the molding process to serve as the weak portion 111, thereby achieving the pressure relief function. This process is relatively simple and can improve the molding efficiency of the explosion-proof valve.

[0055] In one embodiment, the battery housing 10 and the protrusion 11 are integrally molded, which can further improve the molding efficiency of the explosion-proof valve and ensure the stability of the structure.

[0056] In one embodiment, such as Figure 3 and Figure 4 As shown, the battery casing 10 is stamped to form a protrusion 11, thereby forming a groove 13 on the outer side of the battery casing 10. The protrusion 11 and groove 13 are formed by stamping, which is not only simple and easy to process, but also achieves tensile deformation of the structure during the stamping process. This allows a weak part 111 to be formed on the protrusion 11. That is, a locally thinner structure can appear during the stamping process. This part can be used as a weak part 111 to improve the forming efficiency of the explosion-proof valve and ensure the pressure relief effect of the explosion-proof valve, thus avoiding safety problems caused by the explosion-proof valve during use.

[0057] In one embodiment, the minimum thickness of the weak portion 111 is 0.05mm-0.2mm. This not only ensures that the weak portion 111 can effectively burst open under a preset pressure, but also gives the weak portion 111 a certain strength, preventing accidental damage to the weak portion 111, thereby ensuring reliable explosion-proof function. Furthermore, if the thickness of the weak portion 111 is too large, it will be difficult to burst open, while if the thickness of the weak portion 111 is too small, it may fail to burst open under the specific pressure.

[0058] The thickness of the weak portion 111 can be uniform, or the thickness of the weak portion 111 can include at least two portions with different thicknesses.

[0059] In some embodiments, the minimum thickness of the weak portion 111 can be 0.05mm, 0.06mm, 0.07mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.195mm, or 0.2mm, etc.

[0060] In one embodiment, the depth of the groove 13 is 0.1mm-3mm and the port width of the groove 13 is 0.5mm-5mm, which can prevent the protrusion 11 from being too large and occupying too much space, and can ensure that the protrusion 11 has reliable explosion-proof function.

[0061] In some embodiments, the depth of the groove 13 can be 0.1mm, 0.15mm, 0.2mm, 0.5mm, 1mm, 1.1mm, 1.5mm, 1.6mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, or 3mm, etc.

[0062] In some embodiments, the port width of the groove 13 can be 0.5mm, 0.6mm, 0.7mm, 1mm, 1.1mm, 1.5mm, 1.6mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 2.6mm, 2.8mm, 2.9mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.1mm, 4.2mm, 4.5mm, 4.6mm, 4.8mm, 4.9mm, or 5mm, etc.

[0063] In some embodiments, the inner surface of the groove 13 may include at least one of an arc surface and a plane. For example, the groove 13 may be an arc-shaped groove, a polygonal groove, a rectangular groove, a triangular groove, etc., without limitation.

[0064] In one embodiment, the cross-section of the groove 13 is triangular, that is, the protrusion 11 is further triangular pyramidal. The cross-section of the groove 13 is triangular, which not only simplifies the structure but also improves the molding efficiency.

[0065] In one embodiment, at least a portion of the weak part 111 is located at the top of the protrusion 11. Considering that the cross-section of the groove 13 is triangular, stress concentration can be formed at the top of the protrusion 11, thereby making the strength of the top of the protrusion 11 relatively weak, so that it can be used as the weak part 111, thereby improving the explosion-proof performance of the explosion-proof valve.

[0066] It should be noted that a stamping process can be used to form the protrusion 11, thus making it easy to form a triangular pyramidal protrusion 11, which makes the groove 13 a triangular groove. Furthermore, stress concentration occurs at the sharp corner of the protrusion 11, and the top of the protrusion 11 is relatively weak, so it can be used as a weak part 111 to improve the explosion-proof performance of the explosion-proof valve.

[0067] In one embodiment, the thickness of the protrusion 11 is less than the minimum thickness of the battery housing 10, and the thickness of the weak portion 111 is less than the minimum thickness of the protrusion 11, thereby ensuring that the weak portion 111 can be reliably broken through during use, thus ensuring the explosion-proof efficiency of the explosion-proof valve and improving the performance of the explosion-proof valve.

[0068] In one embodiment, the battery casing 10 is made of a metallic material, such as aluminum, steel, copper, or nickel, which is not limited here. Furthermore, the protrusion 11 and the weak portion 111 can be made of aluminum, steel, copper, or nickel.

[0069] In one embodiment, such as Figure 6 and Figure 7 As shown, the battery casing 10 includes: a first casing member 14; and a second casing member 15, which is connected to the first casing member 14 to enclose the battery cell 20. The second casing member 15 is independently arranged from the first casing member 14, which facilitates molding and improves manufacturing efficiency.

[0070] In one embodiment, such as Figure 6 and Figure 7 As shown, the first housing component 14 is a flat plate, and the second housing component 15 forms a receiving cavity. The first housing component 14 is provided with a protrusion 11, which not only facilitates the forming of the protrusion 11, but also effectively prevents the battery cell 20 from forming an electrical connection with the battery casing 10 through conductive foreign objects. The flat plate here may also have a certain receiving cavity, but the height of the receiving cavity is negligible and does not affect the placement of the battery cell 20.

[0071] In one embodiment, such as Figure 6 and Figure 7As shown, a first flange edge 141 is provided on the circumferential edge of the first housing component 14, and a second flange edge 151 is provided on the circumferential edge of the second housing component 15. The first flange edge 141 and the second flange edge 151 are welded to form a flange structure 16. The protrusion 11 is located on the side of the battery cell 20 close to the flange structure 16, so that the protrusion 11 is located between the battery cell 20 and the flange structure 16, thereby effectively preventing conductive foreign objects from conducting between the battery cell 20 and the flange structure 16.

[0072] The first housing component 14, the second housing component 15, the first flange edge 141, and the second flange edge 151 form an edge region. The edge region includes a connection region 12 and a gap 121. In order to facilitate the molding of the battery housing 10, the edge region is not covered by the insulating part 30, which poses an insulation risk. The protrusion 11 is located between the battery cell 20 and the edge region to prevent the battery housing 10 and the battery cell 20 from being connected through conductive foreign objects.

[0073] The welding position of the first flange edge 141 and the second flange edge 151 is the connection area 12. In order to ensure the welding capability of the first flange edge 141 and the second flange edge 151, the first flange edge 141 and the second flange edge 151 will not be covered with an insulating film. In this way, the protrusion 11 in this embodiment can prevent conductive foreign objects from connecting the battery cell 20 and the flange structure 16.

[0074] In one embodiment, a protrusion 11 is provided on the first housing member 14, and the height of the protrusion 11 is not less than the vertical distance between the surface of the first housing member 14 on which the protrusion 11 is provided and the second flange edge 151, so that the protrusion 11 can effectively prevent conductive foreign objects from connecting the cell 20 and the battery casing 10.

[0075] In one embodiment, a connection region 12 is formed between the first flange edge 141 and the second flange edge 151. At least one of the first housing member 14 and the second housing member 15 forms a receiving cavity. No insulating part 30 is provided between the receiving cavity and the connection region 12. The receiving cavity is used to receive the battery cell 20, which makes there a risk of insulation failure between the battery cell 20 and the battery housing 10. In this embodiment, by providing a protrusion 11 between the receiving cavity and the connection region 12, the connection between the battery housing 10 and the battery cell 20 can be effectively prevented from being connected through conductive foreign objects.

[0076] It should be noted that the accommodating cavity of the first housing member 14 and the connecting area 12 may not have an insulating part 30 provided between them. Figure 6As shown, the first housing member 14 is covered with an insulating portion 30, and the portion below the insulating portion 30 can be considered as the receiving cavity of the first housing member 14. In this case, the portion between the receiving cavity and the circumferential edge of the first housing member 14 is not provided with an insulating portion 30. Therefore, a protrusion 11 can be provided on the first housing member 14. Correspondingly, the absence of an insulating portion 30 between the receiving cavity formed by the second housing member 15 and the connecting area 12 can also be explained in the same manner as described above.

[0077] In one embodiment, the height of the protrusion 11 is not less than the height from the point where the second housing member 15 is not provided with the insulating portion 30 to the first flange edge 141. This allows the top of the protrusion 11 to extend beyond the point where the second housing member 15 is not provided with the insulating portion 30, or the top of the protrusion 11 to be flush with the point where the second housing member 15 is not provided with the insulating portion 30. This effectively prevents conductive foreign objects from connecting the battery cell 20 and the battery casing 10. For example, if the second housing member 15 has a receiving cavity, and the opening surface of the receiving cavity is not provided with the insulating portion 30, then the vertical distance between the opening surface of the receiving cavity and the first flange edge 141 needs to be less than or equal to the height of the protrusion 11. Furthermore, if the opening surface of the receiving cavity can be considered as the inner surface of the second flange edge 151, then the vertical distance between the second flange edge 151 and the first flange edge 141 needs to be less than or equal to the height of the protrusion 11.

[0078] In one embodiment, a protrusion 11 is provided on the first housing member 14, and the protrusion 11 is spaced apart from the second housing member 15, thereby avoiding interference between the protrusion 11 and the second housing member 15 and ensuring that the first housing member 14 and the second housing member 15 can be reliably connected.

[0079] In one embodiment, a protrusion 11 is provided on the first housing member 14, and the protrusion 11 contacts the second housing member 15, or the protrusion 11 contacts the second flange edge 151, so that the protrusion 11 can effectively isolate part of the connection area 12 from the cell 20, thereby ensuring that the cell 20 will not form an electrical connection with the battery casing 10 through conductive foreign matter.

[0080] In one embodiment, a protrusion 11 is provided on the first housing member 14, and the center line of the protrusion 11 coincides with the plane of the second flange edge 151 near the edge of the second housing member 15. This not only reduces the internal space of the battery housing 10 occupied by the protrusion 11, but also enables the protrusion 11 to have reliable insulation capabilities.

[0081] In one embodiment, such as Figure 1 and Figure 2As shown, the battery casing 10 has an edge region, which includes a connecting region 12 and a gap 121. A gap 121 is formed between the protrusion 11 and the connecting region 12. A weak part 111 is provided on the side of the protrusion 11 facing the gap 121, so that the gas filling the gap 121 can break through the weak part 111 under a preset pressure.

[0082] It should be noted that after the second housing part 15 is connected to the first housing part 14, there may be a certain gap 121 between the protrusion 11 and the connection area 12, so that gas can be stored in the space inside the flange edge. The insulating part 30 covers a part of the protrusion 11 and covers the side of the protrusion 11 near the cell 20. At this time, the weak part 111 can be located on the other side of the protrusion 11 away from the cell 20, so that the edge of the protrusion 11 near the flange edge is more likely to burst because it is not covered by the insulating part 30.

[0083] In one embodiment, the length of the battery is a, 400mm≤a≤2500mm, the width of the battery is b, the height of the battery is c, 2b≤a≤50b, and / or, 0.5c≤b≤20c.

[0084] Furthermore, 50mm≤b≤200mm, 10mm≤c≤100mm.

[0085] Preferably, 4b≤a≤25b, and / or 2c≤b≤10c.

[0086] In the above embodiments, the battery has a large length-to-width ratio while ensuring sufficient energy density, and further, a large width-to-height ratio.

[0087] In one embodiment, the length of the battery is a, the width of the battery is b, and 4b≤a≤7b. That is, the ratio of the length to the width of the battery in this embodiment is relatively large, thereby increasing the energy density of the battery and facilitating the subsequent formation of the battery module.

[0088] In one embodiment, the height of the battery is c, where 3c≤b≤7c. The ratio of the battery width to its height is relatively large, which facilitates its formation while ensuring sufficient energy density.

[0089] Optionally, the battery length can be 500mm-1500mm, the battery width can be 80mm-150mm, and the battery height can be 15mm-25mm.

[0090] It should be noted that the length of the battery is the dimension along its length, the width of the battery is the dimension along its width, and the height of the battery is the dimension along its height, i.e., the thickness of the battery.

[0091] A battery consists of a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging and discharging. A cell is a unit formed by winding or laminating stacked portions, including a first electrode, a separator, and a second electrode. When the first electrode is the positive electrode, the second electrode is the negative electrode. The polarities of the first and second electrodes can be interchanged.

[0092] In one embodiment, the battery is a stacked battery, which is not only convenient to assemble, but also allows for the processing of batteries with longer lengths.

[0093] Specifically, the cell 20 can be a stacked cell, which has a first electrode layered on top of each other, a second electrode layer with the opposite electrical charge to the first electrode layer, and a separator layer disposed between the first electrode layer and the second electrode layer, so that multiple pairs of first electrode layers and second electrode layers are stacked to form a stacked cell.

[0094] Optionally, the battery can be a wound battery, which involves winding a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes to obtain a wound battery cell.

[0095] An embodiment of the present invention also provides a battery pack including the battery described above.

[0096] A battery pack according to one embodiment of the present invention includes a battery, which includes a battery casing 10 and a battery cell 20. The battery cell 20 is located inside the battery casing 10. By providing a protrusion 11 inside the battery casing 10, the protrusion 11 can be used to isolate the battery cell 20 from conductive foreign objects, thereby preventing conductive foreign objects from forming an electrical connection between the battery casing 10 and the battery cell 20 through the protrusion 11, thereby improving the safety performance of the battery and avoiding the risk of battery short circuit.

[0097] In one embodiment, the battery pack is a battery module or a battery pack.

[0098] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0099] It should be noted that multiple batteries can be assembled into a battery module and then installed inside the battery box. These batteries can be secured using end plates and side plates. Alternatively, multiple batteries can be directly installed inside the battery box without needing to be grouped together; in this case, the end plates and side plates can be removed.

[0100] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0101] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, include: Battery casing (10); A battery cell (20) is located inside the battery casing (10); The battery casing (10) has a protrusion (11) on its inner surface near the battery cell (20) to prevent the battery casing (10) from being electrically connected to the battery cell (20). The protrusion (11) has a weak part (111) so that the weak part (111) can be broken through when the pressure inside the battery casing (10) reaches a preset value. The battery casing (10) has an edge region, which includes a connecting region (12) and a gap (121). The gap (121) is formed between the protrusion (11) and the connecting region (12). The weak part (111) is provided on the side of the protrusion (11) facing the gap (121). The battery cell (20) includes a battery cell body (21) and a tab (22), wherein the tab (22) extends from the side of the battery cell body (21) in a direction that is slightly parallel to the extension direction of the protrusion (11).

2. The battery according to claim 1, characterized in that, The battery casing (10) has an edge region, and the protrusion (11) is located between the battery cell (20) and the edge region to prevent the battery casing (10) and the battery cell (20) from being connected by a conductive foreign object.

3. The battery according to claim 2, characterized in that, The battery casing (10) has a protrusion (11) on its large surface, and the protrusion (11) is located near the edge of the large surface.

4. The battery according to claim 3, characterized in that, The protrusions (11) are provided on both sides of the battery cell (20), and the protrusions (11) are located on the same surface of the battery casing (10).

5. The battery according to any one of claims 1 to 4, characterized in that, An insulating portion (30) is provided on the outer surface of the protrusion (11).

6. The battery according to claim 5, characterized in that, At least a portion of the insulating portion (30) is disposed on the side of the protrusion (11) facing the battery cell (20).

7. The battery according to claim 6, characterized in that, The insulating portion (30) covers a portion of the protrusion (11); Wherein, the area of ​​the insulating part (30) covering the protrusion (11) is not less than half of the outer surface area of ​​the protrusion (11).

8. The battery according to any one of claims 1 to 4, characterized in that, The battery casing (10) and the protrusion (11) are integrally formed.

9. The battery according to claim 8, characterized in that, The protrusion (11) is formed by stamping the battery housing (10) to form a groove (13) on the outside of the battery housing (10).

10. The battery according to any one of claims 1 to 4, characterized in that, The battery casing (10) includes: First housing component (14); A second housing component (15) is connected to the first housing component (14) to enclose the battery cell (20); The first housing component (14) has a first flange edge (141) on its circumferential edge, and the second housing component (15) has a second flange edge (151) on its circumferential edge. The first flange edge (141) and the second flange edge (151) are welded to form a flange structure (16). The protrusion (11) is located on the side of the cell (20) near the flange structure (16), such that the protrusion (11) is located between the cell (20) and the flange structure (16).

11. The battery according to claim 10, characterized in that, The first housing part (14) is provided with the protrusion (11), and the height of the protrusion (11) is not less than the vertical distance between the surface of the first housing part (14) where the protrusion (11) is provided and the second flange edge (151).

12. The battery according to claim 11, characterized in that, A connection area (12) is formed between the first flange edge (141) and the second flange edge (151), and at least one of the first housing part (14) and the second housing part (15) is provided with a receiving cavity, and no insulating part (30) is provided between the receiving cavity and the connection area (12); The height of the protrusion (11) is not less than the height of the second housing part (15) from the first flange edge (141) where the insulating part (30) is not provided.

13. The battery according to claim 10, characterized in that, The first housing component (14) is provided with the protrusion (11), and the protrusion (11) is spaced apart from the second housing component (15).

14. The battery according to claim 10, characterized in that, The first housing part (14) is provided with the protrusion (11), which is in contact with the second housing part (15), or the protrusion (11) is in contact with the second flange edge (151).

15. The battery according to claim 10, characterized in that, The first housing part (14) is provided with the protrusion (11), and the center line of the protrusion (11) coincides with the plane where the second flange edge (151) is located near the edge of the second housing part (15).

16. The battery according to any one of claims 1 to 4, characterized in that, The battery casing (10) includes: First housing component (14); A second housing component (15) is connected to the first housing component (14) to enclose the battery cell (20); The first housing component (14) is a flat plate, and the protrusion (11) is provided on the first housing component (14).

17. A battery pack, characterized in that, The battery includes any one of claims 1 to 16.

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