Battery, battery module, and battery pack

Abstract

The utility model relates to a battery field discloses a kind of battery, battery module and battery pack. Battery includes shell and electric core component, electric core component is set in shell, and electric core component includes pole group and insulating film of wrapping pole group;Wherein, the inside width of shell along width direction is T;The inside width of insulating film along width direction is M, and the outside width is t;In the state that pole group is not wrapped insulating film, the width of pole group along width direction is m;Satisfy, 89.5%≤t / T≤92.5%, -1mm≤(M-m) / 2≤2mm. The utility model can improve assembly efficiency, and can improve security and volumetric energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries, battery modules, and battery packs. Background Technology

[0002] With the development of new energy technologies, batteries are widely used in various fields, such as in new energy vehicles. Furthermore, batteries are increasingly being used in energy storage and other areas.

[0003] When designing a battery, it is necessary to consider not only energy density and safety, but also assembly efficiency. Currently, in order to facilitate the smooth insertion of the electrode assembly into the casing, the casing size is designed to be larger. Although this can improve assembly efficiency, the internal space of the casing is not effectively utilized, resulting in low volumetric energy density. Furthermore, the gap between the electrode assembly and the casing is relatively large, making the electrode assembly prone to shaking and impact, which can cause material to fall out and lead to short circuits and fires, resulting in poor safety. Utility Model Content

[0004] In view of this, the present invention provides a battery, a battery module and a battery pack to solve the problem of low volumetric energy density and poor safety caused by low utilization of casing space.

[0005] In a first aspect, this utility model provides a battery, comprising: a casing; and a cell assembly disposed within the casing, the cell assembly comprising an electrode group and an insulating film enclosing the electrode group; wherein, the inner width of the casing along the width direction is T; the inner width of the insulating film along the width direction is M, and the outer width is t; in the state where the electrode group is not enclosing the insulating film, the width of the electrode group along the width direction is m; satisfying 89.5%≤t / T≤92.5%, -1mm≤(Mm) / 2≤2mm.

[0006] Beneficial effects: When t / T is greater than or equal to 89.5%, the battery cell assembly can be smoothly installed in the casing, improving assembly efficiency and reducing the risk of electrode expansion and interference with the inner wall of the casing, thus improving safety. When t / T is less than or equal to 92.5%, the space utilization rate of the casing can be improved, increasing the volumetric energy density of the battery. Therefore, when 89.5% ≤ t / T ≤ 92.5%, both assembly efficiency and safety and volumetric energy density can be improved.

[0007] When (Mm) / 2 is negative, the electrode assembly is tightly bound by the insulating film, compressing its size and facilitating housing insertion, thus improving assembly efficiency. When (Mm) / 2 is greater than or equal to 0, it allows space for electrode assembly expansion, reducing the risk of insulating film rupture and improving safety. When (Mm) / 2 is less than or equal to 2mm, it prevents the electrode assembly from becoming too loose and reduces the risk of insulating film detachment, improving insulation reliability. Therefore, when -1mm ≤ (Mm) / 2 ≤ 2mm, it improves both assembly efficiency and safety and insulation reliability.

[0008] In one optional embodiment, the inner height of the housing along the height direction is H; the inner height of the insulating film along the height direction is N, and the outer height is h; when the electrode group is not wrapped with the insulating film, the height of the electrode group along the height direction is n; satisfying 0.3mm≤(Hh) / 2≤1mm, -0.5mm≤(Nn) / 2≤1mm.

[0009] Beneficial effects: When (Hh) / 2 is greater than or equal to 0.3mm, the battery cell assembly can be smoothly installed in the casing, improving assembly efficiency and reducing the risk of interference between electrode expansion and the inner wall of the casing, thus improving safety. When (Hh) / 2 is less than or equal to 1mm, it can improve the space utilization of the casing and increase the volumetric energy density of the battery. Therefore, when 0.3mm≤(Hh) / 2≤1mm, it can improve both assembly efficiency and safety and volumetric energy density.

[0010] When (Nn) / 2 is negative, the electrode assembly is tightly bound by the insulating film, compressing its size and facilitating housing insertion, thus improving assembly efficiency. When (Nn) / 2 is greater than or equal to 0, it allows space for electrode assembly expansion, reducing the risk of insulating film rupture and improving safety. When (Nn) / 2 is less than or equal to 1mm, it prevents the electrode assembly from becoming too loose and reduces the risk of insulating film detachment, improving insulation reliability. Therefore, when -0.5mm ≤ (Nn) / 2 ≤ 1mm, it improves both assembly efficiency and safety and insulation reliability.

[0011] In one optional embodiment, the insulating film includes two first walls opposite each other along the width direction and two second walls opposite each other along the height direction, the first walls connecting the ends of the two second walls located on the same side, and an indentation at the connection between the first wall and the second wall; wherein the thickness of the insulating film is A, the depth of the indentation is B, and 1 / 3≤B / A≤1 / 2.

[0012] Beneficial effects: When B / A is greater than or equal to 1 / 3, it facilitates bending of the insulating film to quickly wrap the electrode assembly and improves manufacturing efficiency; when B / A is less than or equal to 1 / 2, it prevents the indentation depth from being too large, preventing the risk of breakage at the indentation and improving the reliability of the insulating film wrapping the electrode assembly; therefore, when 0.05mm≤A≤0.3mm, both manufacturing efficiency and the reliability of the insulating film wrapping the electrode assembly can be improved.

[0013] In one optional embodiment, the distance C between the two ends of the indentation along the length direction and the two edges of the insulating film is respectively 0.5mm≤C≤5mm.

[0014] Beneficial effects: When C is greater than or equal to 0.5mm, it can prevent the risk of tearing at the edge of the insulating film when bending, thus improving the reliability of wrapping the electrode assembly; when C is less than or equal to 5mm, it ensures that the distance between the indentation and the edge of the insulating film is not too large, thereby facilitating bending and enabling rapid wrapping of the electrode assembly, thus improving manufacturing efficiency; therefore, when 0.5mm≤C≤5mm, it can both prevent the risk of tearing at the edge of the insulating film when bending, improving the reliability of wrapping the electrode assembly, and facilitate bending, enabling rapid wrapping of the electrode assembly, thus improving manufacturing efficiency.

[0015] In one optional embodiment, the pole group includes two first surfaces opposite each other along the width direction and two second surfaces opposite each other along the height direction, the first surfaces are connected to the second surfaces, and the area of ​​the first surfaces is greater than the area of ​​the second surfaces, the first wall wraps around the first surfaces, and the second wall wraps around the second surfaces; wherein, of the two second walls, one second wall includes a first part and a second part, and the first part and the second part are at least partially stacked and connected.

[0016] Beneficial effects: Since the second wall corresponds to the second surface of the electrode group, that is, the narrow surface, the first part and the second part of the second wall end at the narrow surface. Compared with ending at the large surface, during the charging and discharging process of the electrode group, it can reduce the risk of the insulation film breaking at the end of the large surface (first surface) due to expansion, and improve the reliability of the insulation film wrapping the electrode group.

[0017] In one optional embodiment, the length of the battery along the length direction is L, the width of the battery along the width direction is W, and the height of the battery along the height direction is H', where 250mm≤L≤1000mm, 12mm≤W≤25mm, and 80mm≤H'≤150mm.

[0018] Beneficial effects: Due to the relatively long length of the blade battery, an excessively large casing can lead to a low internal space utilization rate; conversely, an excessively small casing can cause installation difficulties, significantly impacting assembly efficiency. Furthermore, the electrode assembly expands more significantly during charging and discharging, increasing the risk of damage due to interference and friction with the inner wall of the casing. Therefore, satisfying the following parameters for the blade battery—89.5% ≤ t / T ≤ 92.5%, 0.3mm ≤ (Hh) / 2 ≤ 1mm, -1mm ≤ (Mm) / 2 ≤ 2mm, and -0.5mm ≤ (Nn) / 2 ≤ 1mm—improves assembly efficiency, safety, and volumetric energy density.

[0019] In one optional embodiment, the electrode assembly includes an electrode body and two tabs respectively connected to both ends of the electrode body along the length direction; the housing is provided with openings at both ends along the length direction; the battery further includes two top cover assemblies respectively disposed at the two openings, the top cover assemblies and the housing forming a closed space for accommodating the cell assembly, and the two top cover assemblies are electrically connected to the two tabs respectively.

[0020] Beneficial effects: By setting top cover assemblies at both ends of the casing, and thus providing tabs at both ends, current can be collected from both ends of the battery simultaneously, reducing the lateral transmission distance of electrons in the current collector, significantly reducing the internal resistance of the battery, and improving charging and discharging efficiency.

[0021] Secondly, this utility model also provides a battery module, including the battery described in any embodiment of the first aspect.

[0022] Beneficial effects: Since the battery module includes the battery mentioned in the first aspect, the battery module also has the same beneficial effects as the battery, which will not be elaborated here.

[0023] Thirdly, this utility model also provides a battery pack, including the battery module described in any embodiment of the second aspect.

[0024] Beneficial effects: Since the battery pack contains the battery mentioned in the first aspect, the battery pack also has the same beneficial effects as the battery, which will not be elaborated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of a battery according to an embodiment of the present invention; Figure 2 This is an exploded view of the battery according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the housing according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of a battery cell assembly according to an embodiment of the present utility model, wherein, for ease of explanation, one end of the electrode group is shortened from the insulating film; Figure 5 This is a schematic diagram of the electrode assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the unfolded insulating film according to an embodiment of the present invention; Figure 7 for Figure 6 A cross-sectional view cut along EE.

[0027] Explanation of reference numerals in the attached figures: 100-Battery; 10-Casing; 20-Cell Assembly; 21-Electrode Group; 211-Electrode Body; 212-Electrode Tab; 201-First Surface; 202-Second Surface; 22-Insulating Film; 221-First Wall; 222-Second Wall; 222a-First Part; 222b-Second Part; 223-Indentation; 30-Top Cover Assembly; 31-Cover Plate; 32-Electrode Terminal; X-Length Direction; Y-Width Direction; Z-Height Direction. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] When designing a battery, not only energy density and safety need to be considered, but also assembly efficiency. Currently, to facilitate the insertion of electrode assemblies into the casing, the casing size can be made larger. While this improves assembly efficiency, the internal space of the casing is not effectively utilized, resulting in a low volumetric energy density. Furthermore, the larger gap between the electrode assemblies and the casing makes them prone to shaking and impacts, causing material to fall out and potentially leading to short circuits and fires, thus compromising safety. If the casing size is made too small, it is difficult to insert the electrode assemblies, affecting assembly efficiency. Moreover, the electrode assemblies expand during charging and discharging, and their larger surfaces are prone to interference and friction with the inner wall of the casing, potentially damaging the insulating film surrounding the electrode assemblies and causing short circuits.

[0030] How to match the housing size with the electrode assembly size to balance assembly efficiency, volumetric energy density, and safety is a current research topic. Furthermore, since the insulating film includes the electrode assembly, the matching relationship between the insulating film and the electrode assembly must be considered during the design phase. An insulating film that wraps the electrode assembly too tightly or too loosely will affect housing integration, volumetric energy density, and safety.

[0031] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, a battery 100 is provided, including a housing 10 and a cell assembly 20. The cell assembly 20 is disposed within the housing 10 and includes an electrode group 21 and an insulating film 22 covering the electrode group 21. The housing 10 has an internal width T along the width direction Y and an internal height H along the height direction Z. The insulating film 22 has an internal width M and an external width t along the width direction Y, and an internal height N and an external height h along the height direction Z. The electrode group 21 has a width m along the width direction Y and a height n along the height direction Z, where m and n are the dimensions of the electrode group 21 before being covered by the insulating film 22. The following conditions are met: 89.5% ≤ t / T ≤ 92.5%, -1mm ≤ (Mm) / 2 ≤ 2mm, and / or 0.3mm ≤ (Hh) / 2 ≤ 1mm, -0.5mm ≤ (Nn) / 2 ≤ 1mm.

[0033] The housing 10 has an internal space to house the battery cell assembly 20. Furthermore, the housing 10 can also contain electrolyte, etc. The housing 10 can be made of aluminum, aluminum alloy, stainless steel, etc. The housing 10 can be a square housing, a blade housing, etc.

[0034] The battery cell assembly 20 includes an electrode group 21 and an insulating film 22 enclosing the electrode group 21. The electrode group 21 is a component in the battery 100 where a chemical reaction occurs to provide electrical energy. The electrode group 21 may include an electrode body 211 and tabs 212. The electrode body 211 may include a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. The electrode body 211 may be a wound structure or a stacked structure.

[0035] The insulating film 22 wraps around the electrode assembly 21, serving as an insulating isolation housing 10. The insulating film 22 can wrap around the peripheral sidewalls of the electrode assembly 21. The insulating film 22 can be made of insulating materials such as polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polytetrafluoroethylene (PTFE).

[0036] Reference Figure 3The internal width T of the shell 10 along the width direction Y is the width of the internal space of the shell 10, that is, the distance between the inner wall surfaces of two opposite walls of the shell 10 along the width direction Y. The internal height H of the shell 10 along the height direction Z is the height of the internal space of the shell 10, that is, the distance between the inner wall surfaces of two opposite walls of the shell 10 along the height direction Z.

[0037] Reference Figure 4 The internal width M of the insulating membrane 22 along the width direction Y is the width of the internal space of the insulating membrane 22, that is, the distance between the inner wall surfaces of the two opposite walls of the insulating membrane 22 along the width direction Y. The external width t of the insulating membrane 22 along the width direction Y is the distance between the outer wall surfaces of the two opposite walls of the insulating membrane 22 along the width direction Y. The internal height N of the insulating membrane 22 along the height direction Z is the height of the internal space of the insulating membrane 22, that is, the distance between the inner wall surfaces of the two opposite walls of the insulating membrane 22 along the height direction Z. The external height h of the insulating membrane 22 along the height direction Z is the distance between the outer wall surfaces of the two opposite walls of the insulating membrane 22 along the height direction Z.

[0038] Reference Figure 5 The width *m* along the width direction *Y* and the height *n* along the height direction *Z* of the electrode assembly 21 are the dimensions of the electrode assembly 21 before it is wrapped with the insulating film 22. After the electrode assembly 21 is wrapped with the insulating film 22, it can be tightened by the insulating film 22, making the electrode assembly 21 more compact. At this time, the width and height of the electrode assembly 21 are reduced compared to the dimensions before it is wrapped with the insulating film 22, which facilitates insertion into the housing and is beneficial to improving the volumetric energy density. Of course, after the electrode assembly 21 is wrapped with the insulating film 22, its width and height can also remain unchanged, that is, it is not tightened or the tightening degree is very small.

[0039] 89.5%≤t / T≤92.5%, where t / T can be 89.5%, 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, or any value between the two.

[0040] 0.3mm≤(Hh) / 2≤1mm, where (Hh) / 2 can be 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm or any value between the two.

[0041] -1mm≤(Mm) / 2≤2mm, where (Mm) / 2 can be -1mm, -0.5mm, 0.5mm, 1.2mm, 1.5mm, 1.8mm, 2mm or any value between the two.

[0042] -0.5mm≤(Nn) / 2≤1mm, where (Nn) / 2 can be -0.5mm, 0.5mm, 0.7mm, 0.8mm, 0.9mm, 1mm or any value between the two.

[0043] When t / T is greater than or equal to 89.5%, and / or (Hh) / 2 is greater than or equal to 0.3 mm, the cell assembly 20 can be smoothly inserted into the casing, improving assembly efficiency and reducing the risk of interference between the expansion of the electrode group 21 and the inner wall of the casing 10, thus improving safety. When t / T is less than or equal to 92.5%, and / or (Hh) / 2 is less than or equal to 1 mm, the space utilization rate of the casing 10 can be improved, and the volumetric energy density of the battery 100 can be increased. Therefore, when 89.5% ≤ t / T ≤ 92.5% and 0.3 mm ≤ (Hh) / 2 ≤ 1 mm, both assembly efficiency and safety and volumetric energy density can be improved.

[0044] When (Mm) / 2 is negative, and / or (Nn) / 2 is negative, the electrode assembly 21 is bound tightly by the insulating film 22, compressing the size of the electrode assembly 21, facilitating insertion into the housing, and improving assembly efficiency. When (Mm) / 2 is greater than or equal to 0, and (Nn) / 2 is greater than or equal to 0, space is reserved for the expansion of the electrode assembly 21, reducing the risk of the insulating film 22 rupture and improving safety. When (Mm) / 2 is less than or equal to 2mm, and / or (Nn) / 2 is less than or equal to 1mm, the electrode assembly 21 is not too loose, and the risk of the insulating film 22 falling off is reduced, improving insulation reliability. Therefore, when -1mm ≤ (Mm) / 2 ≤ 2mm, and / or -0.5mm ≤ (Nn) / 2 ≤ 1mm, both assembly efficiency and safety and insulation reliability can be improved.

[0045] In some embodiments, refer to Figure 4 , Figure 6 and Figure 7 The insulating film 22 includes two first walls 221 opposite each other along the width direction Y and two second walls 222 opposite each other along the height direction Z. The first walls 221 connect the ends of the two second walls 222 located on the same side, and the two second walls 222 and the two first walls 221 form a generally square structure. There is an indentation 223 at the connection between the first walls 221 and the second walls 222; wherein the thickness of the insulating film 22 is A, the depth of the indentation 223 is B, and 1 / 3≤B / A≤1 / 2.

[0046] As an example, the thickness A of the insulating film 22 satisfies 0.05mm≤A≤0.3mm, where A can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm or any value between the two.

[0047] When B / A is greater than or equal to 1 / 3, it facilitates the bending of the insulating film 22 to quickly wrap the electrode assembly 21, thus improving manufacturing efficiency. When B / A is less than or equal to 1 / 2, it prevents the depth of the indentation 223 from being too large, thus preventing the risk of breakage at the indentation 223 and improving the reliability of the insulating film 22 wrapping the electrode assembly 21. Therefore, when 0.05mm≤A≤0.3mm, both manufacturing efficiency and the reliability of the insulating film 22 wrapping the electrode assembly 21 can be improved.

[0048] In some embodiments, the distance between the two ends of the indentation 223 and the two edges of the insulating film 22 along the length direction X is C, where 0.5mm≤C≤5mm.

[0049] C can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or any value between the two.

[0050] When C is greater than or equal to 0.5 mm, it can prevent the risk of tearing at the edge of the insulating film 22 when bending, thus improving the reliability of wrapping the electrode assembly 21. When C is less than or equal to 5 mm, it ensures that the distance between the indentation 223 and the edge of the insulating film 22 is not too large, thereby facilitating bending and enabling rapid wrapping of the electrode assembly 21, thus improving manufacturing efficiency. Therefore, when 0.5 mm ≤ C ≤ 5 mm, it can both prevent the risk of tearing at the edge of the insulating film 22 when bending, improving the reliability of wrapping the electrode assembly 21, and facilitate bending, enabling rapid wrapping of the electrode assembly 21, thus improving manufacturing efficiency.

[0051] In some embodiments, refer to Figures 4-7 The pole group 21 includes two first surfaces 201 facing each other along the width direction Y and two second surfaces 202 facing each other along the height direction Z. The first surfaces 201 are connected to the second surfaces 202, and the area of ​​the first surfaces 201 is larger than the area of ​​the second surfaces 202. A first wall 221 encloses the first surfaces 201, and a second wall 222 encloses the second surfaces 202. Among the two second walls 222, one second wall 222 includes a first part 222a and a second part 222b, and the first part 222a and the second part 222b are at least partially stacked and connected.

[0052] The area of ​​the first surface 201 is larger than the area of ​​the second surface 202, that is, the first surface 201 is the large surface of the pole group 21, and the second surface 202 is the narrow surface of the pole group 21. The first wall 221 of the insulating film 22 corresponds to the large surface, and the second wall 222 corresponds to the narrow surface.

[0053] The second wall 222 includes a first part 222a and a second part 222b, which are the finishing portions of the insulating film 22. The first part 222a and the second part 222b are at least partially overlapped along the height direction Z, and may be fully or partially overlapped. They can be bonded and fixed together with U-shaped tape.

[0054] Since the second wall 222 corresponds to the second surface 202 of the electrode group 21, that is, the narrow surface, the first part 222a and the second part 222b of the second wall 222 end at the narrow surface. Compared with ending at the large surface, during the charging and discharging process of the electrode group 21, the risk of the insulation film 22 breaking at the end due to the expansion of the large surface (first surface 201) can be reduced, thereby improving the reliability of the insulation film 22 wrapping the electrode group 21.

[0055] In some embodiments, the wall thickness of the housing 10 is D, where 0.2 mm ≤ D ≤ 1 mm.

[0056] D can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm or any value between the two.

[0057] In some embodiments, refer to Figure 1 Battery 100 is a blade battery. The length of battery 100 along the length direction X is L, the width of battery 100 along the width direction Y is W, and the height of battery 100 along the height direction Z is H'. 250mm≤L≤1000mm, 12mm≤W≤25mm, 80mm≤H'≤150mm.

[0058] L can be 250mm, 350mm, 450mm, 500mm, 650mm, 750mm, 900mm, 1000mm or any value between the two.

[0059] W can be 12mm, 13mm, 14mm, 17mm, 19mm, 20mm, 22mm, 23mm, 24mm, 25mm or any value between two of these.

[0060] H' can be 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two of these.

[0061] When top cover assemblies 30 are provided at both ends of the housing 10, the length L of the battery 100 is the dimension between the outer sides of the cover plates 31 of the two top cover assemblies 30. The width W of the battery 100 is the distance between the two opposite first surfaces 201 (outer surfaces) of the housing 10. The height H' of the battery 100 is the distance between the two opposite second surfaces 202 (outer surfaces) of the housing 10.

[0062] Because of the relatively long length of the blade battery, if the casing 10 is too large, it will easily lead to a low internal space utilization rate; if the casing 10 is too small, it will be more difficult to install, which will have a greater impact on assembly efficiency. Moreover, the electrode assembly 21 expands more significantly during charging and discharging, which will increase the risk of damage due to interference and friction with the inner wall of the casing, resulting in poor safety. Therefore, when the following conditions are met: 89.5%≤t / T≤92.5%, 0.3mm≤(Hh) / 2≤1mm, -1mm≤(Mm) / 2≤2mm, -0.5mm≤(Nn) / 2≤1mm, the blade battery can improve both assembly efficiency, safety, and volumetric energy density.

[0063] In some embodiments, refer to Figure 2 The electrode assembly 21 includes an electrode body 211 and two tabs 212 respectively connected to the two ends of the electrode body 211 along the length direction X; the housing 10 has openings at both ends along the length direction X; the battery 100 also includes two top cover assemblies 30 respectively disposed at the two openings, the top cover assemblies 30 and the housing 10 form a closed space for accommodating the cell assembly 20, and the two top cover assemblies 30 are electrically connected to the two tabs 212 respectively.

[0064] The top cover assembly 30 includes a cover plate 31 and electrode terminals 32 disposed on the cover plate 31. The cover plate 31 seals the opening, forming a closed space for accommodating the battery cell assembly 20. The tabs 212 are electrically connected to the electrode terminals 32. The electrode terminals 32 are components that connect the electrode group 21 to an external circuit for input and output of electrical energy. The electrode terminals 32 can be pole posts. The two tabs 212 can be a positive tab and a negative tab, respectively. The two electrode terminals 32 can be a positive terminal and a negative terminal, respectively. An explosion-proof valve, a liquid injection hole, etc., may also be provided on the cover plate 31.

[0065] Top cover assemblies 30 are provided at both ends of the housing 10, so that tabs 212 are provided at both ends, which enables current to be collected from both ends of the battery 100 at the same time, reducing the lateral transmission distance of electrons in the current collector, significantly reducing the internal resistance of the battery 100, and improving the charging and discharging efficiency.

[0066] According to an embodiment of the present invention, in a second aspect, a battery module is provided, including the battery 100 mentioned in any embodiment of the first aspect. The battery module of this application embodiment may include one or more batteries 100 to provide higher voltage and capacity. When there are multiple batteries 100, the multiple batteries 100 can be connected in series, parallel, or mixed via a busbar. Multiple batteries 100 are arranged and fixed to form a battery module. For example, multiple batteries 100 can be fixed together using cable ties or other binding materials.

[0067] Since the battery module includes the battery 100 mentioned earlier, the specific structure and beneficial effects of the battery 100 have been described in detail in the previous text, and will not be repeated here.

[0068] According to an embodiment of the present invention, in a third aspect, a battery pack is provided, including the battery module mentioned in any embodiment of the second aspect.

[0069] The battery pack may include a housing, in which the battery modules are housed. The housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0070] Battery packs can be used in vehicles, energy storage, and other fields. Vehicles can be gasoline vehicles, natural gas vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc.

[0071] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: case; A battery cell assembly is disposed within the housing, the battery cell assembly including an electrode group and an insulating film enclosing the electrode group; Wherein, the internal width of the shell along the width direction is T; The insulating film has an inner width of M and an outer width of t along the width direction; When the electrode assembly is not wrapped with the insulating film, the width of the electrode assembly along the width direction is m; It satisfies the following conditions: 89.5%≤t / T≤92.5%, -1mm≤(Mm) / 2≤2mm.

2. The battery according to claim 1, characterized in that, The internal height of the shell along the height direction is H; The insulating film has an internal height of N and an external height of h along the height direction; When the electrode assembly is not wrapped with the insulating film, the height of the electrode assembly along the height direction is n; It satisfies the following conditions: 0.3mm≤(Hh) / 2≤1mm, -0.5mm≤(Nn) / 2≤1mm.

3. The battery according to claim 1, characterized in that, The insulating film includes two first walls opposite each other along the width direction and two second walls opposite each other along the height direction. The first walls connect the ends of the two second walls located on the same side, and the connection between the first walls and the second walls has an indentation. Wherein, the thickness of the insulating film is A, the depth of the indentation is B, and 1 / 3≤B / A≤1 / 2.

4. The battery according to claim 3, characterized in that, The distance C between the two ends of the indentation along its length and the two edges of the insulating film is 0.5mm≤C≤5mm.

5. The battery according to claim 3, characterized in that, The thickness of the insulating film satisfies 0.05mm≤A≤0.3mm.

6. The battery according to claim 3, characterized in that, The pole group includes two first surfaces opposite each other along the width direction and two second surfaces opposite each other along the height direction. The first surfaces are connected to the second surfaces, and the area of ​​the first surfaces is larger than the area of ​​the second surfaces. The first wall wraps around the first surfaces, and the second wall wraps around the second surfaces. In one of the two second walls, one second wall includes a first part and a second part, the first part and the second part being at least partially stacked and connected.

7. The battery according to any one of claims 1-6, characterized in that, The wall thickness of the shell is D, where 0.2mm ≤ D ≤ 1mm.

8. The battery according to any one of claims 1-6, characterized in that, The length of the battery along the length direction is L, the width of the battery along the width direction is W, and the height of the battery along the height direction is H'. 250mm≤L≤1000mm, 12mm≤W≤25mm, 80mm≤H'≤150mm.

9. A battery module, characterized in that, The battery includes any one of claims 1-8.

10. A battery pack, characterized in that, Includes the battery module as described in claim 9.

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