High-capacity lithium ion battery

Abstract

The invention discloses a high-capacity lithium ion battery, the battery comprises a shell, a plurality of groups of core packages and a busbar, the shell is provided with an accommodating cavity, the accommodating cavity is internally provided with electrolyte, the plurality of groups of core packages are arranged in parallel along a first direction, each group of core packages comprises at least two core package units, and the at least two core package units in each group are arranged in parallel along the first direction; the busbar comprises a plurality of positive electrode connecting parts and a plurality of negative electrode connecting parts, the plurality of positive electrode connecting parts and the plurality of negative electrode connecting parts are arranged at intervals along a second direction and are in one-to-one correspondence, the second direction is orthogonal to the first direction, the plurality of groups of core packages are arranged between the positive electrode connecting parts and the negative electrode connecting parts, and the plurality of groups of core packages are in one-to-one correspondence with the plurality of positive electrode connecting parts; the positive pole lug of each group of core cladding is connected with the positive pole connecting part, and the negative pole lug of each group of core cladding is connected with the negative pole connecting part. The high-capacity lithium ion battery provided by the embodiment of the invention is high in energy density, good in performance, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium - ion batteries, and more specifically, to a high - capacity lithium - ion battery. Background Art

[0002] Lithium - ion batteries are widely used in fields such as electric vehicles and energy storage. These application fields require lithium - ion batteries to have properties such as safety, large energy, and high power.

[0003] In related technologies, multiple small - capacity lithium - ion battery monomers are connected in parallel to form a large - capacity lithium - ion battery block to meet the needs of large - energy electric vehicles, energy storage, and other systems. However, the capacity of the core - package housing is limited, and there are many structural components for connecting multiple small - capacity lithium - ion battery monomers in parallel, resulting in a relatively reduced number of core - packages inside the housing, which affects battery performance. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in related technologies to some extent. For this purpose, an embodiment of the present invention provides a high - capacity lithium - ion battery.

[0005] The high - capacity lithium - ion battery according to the embodiment of the present invention includes:

[0006] A housing having an accommodation cavity, and an electrolyte is provided in the accommodation cavity;

[0007] Multiple groups of core - packages, the multiple groups of core - packages are arranged in parallel along a first direction, each group of core - packages includes at least two core - package units, and at least two of the core - package units in each group are arranged in parallel along the first direction;

[0008] A bus bar having a plurality of positive - pole connection parts arranged in parallel along the first direction and a plurality of negative - pole connection parts arranged in parallel along the first direction. The plurality of positive - pole connection parts and the plurality of negative - pole connection parts are arranged at intervals along a second direction and correspond one by one. The second direction is orthogonal to the first direction. The multiple groups of core - packages are arranged between the positive - pole connection parts and the negative - pole connection parts. The multiple groups of core - packages correspond to the plurality of positive - pole connection parts one by one. The positive - pole tab of each group of core - packages is connected to the positive - pole connection part, and the negative - pole tab of each group of core - packages is connected to the negative - pole connection part.

[0009] The high-capacity lithium-ion battery according to the embodiment of the present invention has at least two core package units arranged in parallel to form multiple groups of core packages. The multiple groups of core packages are arranged in parallel and are respectively connected to multiple parallel positive connection parts and multiple parallel negative connection parts, effectively reducing the internal resistance of the battery and improving the performance of the battery. Moreover, the multiple core package units are in parallel, the multiple groups of core packages are in parallel, the multiple positive connection parts are in parallel, and the multiple negative connection parts are in parallel, saving multiple sets of structural parts required for a single core package compared with the prior art, increasing the capacity of the housing, so that more core packages and electrolytes can be accommodated, and improving the volumetric energy density and cycle life of the core packages.

[0010] In some embodiments, the high-capacity lithium-ion battery further includes a first frame body and a second frame body. The first frame body is arranged on the top surface of the accommodation cavity, and the second frame body is arranged on the bottom surface of the accommodation cavity. The first frame body and the second frame body are used to limit the multiple groups of core packages.

[0011] In some embodiments, the first frame body is a plastic part.

[0012] In some embodiments, the lower surface of the first frame body is provided with a plurality of first bosses, and the plurality of first bosses are arranged at intervals along the first direction. The upper surface of the second frame body is provided with a plurality of second bosses, and the plurality of second bosses are arranged at intervals along the first direction. The plurality of first bosses and the plurality of second bosses correspond to each other one by one. An installation position is formed between adjacent first bosses. The multiple groups of core packages correspond to the multiple installation positions one by one, and each group of core packages is arranged in the installation position.

[0013] In some embodiments, the first frame body is provided with a plurality of exhaust holes, and the plurality of exhaust holes are arranged at intervals along the first direction. The plurality of exhaust holes correspond to the multiple groups of core packages one by one.

[0014] In some embodiments, the second frame body is provided with a plurality of through hole grooves, and the plurality of through hole grooves are arranged at intervals along the first direction. The through hole grooves extend along the second direction. The plurality of through hole grooves correspond to the plurality of second bosses one by one. The through hole grooves and the second bosses are arranged along the second direction. The electrolyte in the accommodation cavity can contact the core packages through the through hole grooves.

[0015] In some embodiments, the top surface of the housing has an upper opening, and the bottom surface of the housing has a lower opening.

[0016] The high-capacity lithium-ion battery further includes a top cover and a bottom plate. The top cover is provided at the upper opening for covering the upper opening. The bottom plate is provided at the lower opening for covering the lower opening. The first frame is provided below the top cover. The upper surface of the bottom plate has a plurality of heat-conducting fins, and the plurality of heat-conducting fins are arranged at intervals in a first direction. Each group of core packs is provided between two adjacent heat-conducting fins, and the heat-conducting fins can be fitted into the through-hole grooves.

[0017] In some embodiments, the bus bar includes a positive bus bar and a negative bus bar. A plurality of positive connection portions are provided on the positive bus bar and arranged at intervals in the first direction. A plurality of negative connection portions are provided on the negative bus bar and arranged at intervals in the first direction.

[0018] In some embodiments, a first limiting portion and a second limiting portion are provided on the lower surface of the first frame. The first limiting portion and the second limiting portion are arranged at intervals in a second direction. The positive bus bar is provided in the first limiting portion, the negative bus bar is provided in the second limiting portion, and the first boss is provided between the first limiting portion and the second limiting portion.

[0019] In some embodiments, the high-capacity lithium-ion battery further includes a first insulating member and a second insulating member. The first insulating member is wrapped around the outer surface of each group of core packs, and the second insulating member is wrapped around the outer surface of the housing. Description of the Drawings

[0020] Figure 1 is an overall schematic diagram of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0021] Figure 2 is an exploded schematic diagram of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0022] Figure 3 is an exploded schematic diagram of a partial structure of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0023] Figure 4 is a top view schematic diagram of the first frame of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0024] Figure 5 is a rear view schematic diagram of the first frame of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0025] Figure 6 is a schematic diagram of the positive bus bar of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0026] Figure 7 is a schematic diagram of the second frame of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of the bottom plate of the high-capacity lithium-ion battery according to an embodiment of the present invention.

[0028] Reference numerals: 100, battery; 1, housing; 11, accommodation cavity; 12, upper opening; 2, core package; 21, core package unit; 3, bus bar; 31, positive bus bar; 32, negative bus bar; 33, positive connection part; 34, negative connection part; 35, first reinforcing rib; 36, second reinforcing rib; 41, first frame; 411, first extension part; 412, first boss; 413, installation position; 414, exhaust hole; 415, groove; 416, first limiting part; 417, second limiting part; 42, second frame; 421, second extension part; 422, second boss; 423, through-hole groove; 51, top cover; 52, bottom plate; 521, heat-conducting sheet; 61, aluminum plate; 611, convex part; 62, bottom patch; 71, positive electrode post; 72, negative electrode post; 81, first insulating part; 82, second insulating part. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below, and the examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0030] As Figures 1 - 8 shown, the high-capacity lithium-ion battery according to an embodiment of the present invention includes a housing 1, a core package 2 and a bus bar 3, and there are multiple groups of core packages 2. The housing 1 has an accommodation cavity 11, and the accommodation cavity 11 contains electrolyte. Multiple groups of core packages 2 are arranged in parallel along a first direction, and each group of core packages 2 includes at least two core package units 21, and at least two core package units 21 in each group are arranged in parallel along the first direction. The bus bar 3 has a plurality of positive connection parts 33 arranged in parallel along the first direction and a plurality of negative connection parts 34 arranged in parallel along the first direction. The plurality of positive connection parts 33 and the plurality of negative connection parts 34 are arranged at intervals along a second direction and correspond to each other one by one. The second direction is orthogonal to the first direction. Multiple groups of core packages 2 are arranged between the positive connection part 33 and the negative connection part 34. Multiple groups of core packages 2 correspond to the plurality of positive connection parts 33 one by one. The positive electrode tab of each group of core packages 2 is connected to the positive connection part 33, and the negative electrode tab of each group of core packages 2 is connected to the negative connection part 34.

[0031] In the high-capacity lithium-ion battery according to the embodiment of the present invention, at least two core package units 21 are connected in parallel to form multiple groups of core packages 2. The multiple groups of core packages 2 are connected in parallel and are respectively and correspondingly connected to multiple positively connected parts 33 connected in parallel and multiple negatively connected parts 34 connected in parallel, effectively reducing the internal resistance of the battery 100 and improving the performance of the battery 100. Moreover, the multiple core package units 21 are connected in parallel, the multiple groups of core packages 2 are connected in parallel, the multiple positively connected parts 33 are connected in parallel, and the multiple negatively connected parts 34 are connected in parallel, saving multiple sets of structural parts required for a single core package 2 compared with the prior art, increasing the capacity of the housing 1, so that more core packages 2 and electrolyte can be accommodated, and improving the volume energy density and cycle life of the core packages 2.

[0032] Specifically, the housing 1 is made by bending and welding. The positive electrode tab of the core package 2 is connected to the positively connected part 33 by laser welding, and the negative electrode tab of the core package 2 is also connected to the negatively connected part 34 by laser welding.

[0033] In some embodiments, the high-capacity lithium-ion battery further includes a first frame body 41 and a second frame body 42. The first frame body 41 is arranged on the top surface of the accommodation cavity 11, and the second frame body 42 is arranged on the bottom surface of the accommodation cavity 11. The first frame body 41 and the second frame body 42 are used to limit multiple groups of core packages 2.

[0034] Specifically, the first frame body 41 and the second frame body 42 are arranged oppositely. Both ends of the first frame body 41 are provided with first extending parts 411 that cooperate with the side surfaces of multiple groups of core packages 2 to limit the upper ends of multiple groups of core packages 2. Both ends of the second frame body 42 are provided with second extending parts 421 that cooperate with the side surfaces of multiple groups of core packages 2 to limit the lower ends of multiple groups of core packages 2, and the second extending parts 421 are arranged corresponding to the first extending parts 411.

[0035] An installation space is formed between the first frame body 41 and the second frame body 42. Multiple groups of core packages 2 are arranged in the installation space. The first frame body 41 and the second frame body 42 limit multiple groups of core packages 2 to ensure that multiple groups of core packages 2 are stably and firmly installed in the accommodation cavity 11.

[0036] In some embodiments, the first frame body 41 is a plastic part with insulating properties, which can separate multiple groups of core packages 2 from the top surface of the housing 1 and perform insulation to ensure the safety of the battery 100.

[0037] In some embodiments, the second frame body 42 is made of an insulating material to separate multiple groups of core packages 2 from the bottom surface of the housing 1 and perform insulation to ensure the safety of the battery 100.

[0038] In some embodiments, a plurality of first bosses 412 are provided on the lower surface of the first frame body 41, and the plurality of first bosses 412 are arranged at intervals along the first direction. A plurality of second bosses 422 are provided on the upper surface of the second frame body 42, and the plurality of second bosses 422 are arranged at intervals along the first direction. The plurality of first bosses 412 and the plurality of second bosses 422 correspond to each other one by one. An installation position 413 is formed between adjacent first bosses 412. Multiple groups of core packages 2 correspond to the multiple installation positions 413 one by one, and each group of core packages 2 is arranged in the installation position 413.

[0039] Specifically, the plurality of first bosses 412 are divided into two groups, and the two groups of first bosses 412 are arranged at intervals along the second direction, and the two groups of first bosses 412 are symmetrically arranged along the central axis of the first frame body 41 in the second direction. Each group of first bosses 412 includes a plurality of first bosses 412, and the plurality of first bosses 412 in each group are arranged at intervals along the first direction, and the plurality of first bosses 412 in the two groups correspond to each other one by one.

[0040] The plurality of second bosses 422 are divided into two groups, and the two groups of second bosses 422 are arranged at intervals along the second direction, and the two groups of second bosses 422 are symmetrically arranged along the central axis of the second frame body 42 in the second direction. The two groups of second bosses 422 and the two groups of first bosses 412 correspond to each other one by one. Each group of second bosses 422 includes a plurality of second bosses 422, and the plurality of second bosses 422 in each group are arranged at intervals along the first direction, and the plurality of second bosses 422 in the two groups correspond to each other one by one. By providing the first bosses 412 and the second bosses 422, the structural strength of the first frame body 41 and the second frame body 42 is improved, the multiple groups of core packages 2 are limited, and the stable installation of the multiple groups of core packages 2 in the accommodation cavity 11 is ensured.

[0041] In some embodiments, a plurality of exhaust holes 414 are provided on the first frame body 41, and the plurality of exhaust holes 414 are arranged at intervals along the first direction, and the plurality of exhaust holes 414 correspond to the multiple groups of core packages 2 one by one.

[0042] Specifically, a groove 415 is provided on the top surface of the first frame body 41, the groove 415 extends along the first direction, and the exhaust holes 414 are provided on the bottom surface of the groove 415 and penetrate through the bottom surface of the groove 415. The plurality of exhaust holes 414 are provided between the two groups of first bosses 412 and are arranged at intervals along the first direction, and the plurality of exhaust holes 414 correspond to the plurality of first bosses 412 in each group of first bosses 412. By providing the exhaust holes 414, it is convenient for the gas generated during the operation of the multiple groups of core packages 2 in the accommodation cavity 11 to be discharged and burst.

[0043] In some embodiments, a plurality of through hole grooves 423 are provided on the second frame body 42. The plurality of through hole grooves 423 are arranged at intervals in the first direction. The through hole grooves 423 extend in the second direction. The plurality of through hole grooves 423 correspond to the plurality of second bosses 422 one by one. The through hole grooves 423 and the second bosses 422 are arranged in the second direction. The electrolyte in the accommodation cavity 11 can contact the core package 2 through the through hole grooves 423.

[0044] Specifically, the plurality of through hole grooves 423 are provided between two groups of second bosses 422 and arranged at intervals in the first direction. The plurality of through hole grooves 423 correspond to the plurality of second bosses 422 in each group of second bosses 422 one by one. By providing the through hole grooves 423, the electrolyte in the accommodation cavity 11 can penetrate and infiltrate the core package 2.

[0045] In some embodiments, the top surface of the housing 1 has an upper opening 12, and the bottom surface of the housing 1 has a lower opening (not shown). The upper opening 12 and the lower opening communicate with the accommodation cavity 11. The high-capacity lithium-ion battery further includes a top cover 51 and a bottom plate 52. The top cover 51 is provided on the upper opening 12 for covering the upper opening 12, and the bottom plate 52 is provided on the lower opening for covering the lower opening. The first frame body 41 is provided below the top cover 51 and is connected by ultrasonic hot melting to insulate the top cover 51 and the core package 2. The upper surface of the bottom plate 52 has a plurality of heat conducting sheets 521. The plurality of heat conducting sheets 521 are arranged at intervals in the first direction. Each group of core packages 2 is provided between two adjacent heat conducting sheets 521. The heat conducting sheets 521 can be fitted into the through hole grooves 423 to transfer the heat inside the core package 2 to the bottom of the housing 1, and the heat is dissipated through liquid cooling or air cooling of the battery pack, improving the safety and reliability of the battery 100.

[0046] Specifically, an aluminum plate 61 is provided on the upper surface of the top cover 51, and a convex portion 611 is provided on the aluminum plate 61 to increase the structural strength of the aluminum plate 61. A bottom patch 62 is pasted on the lower surface of the bottom plate 52 to avoid accidental short circuits during the transportation of the battery 100.

[0047] In some embodiments, the bus bar 3 includes a positive bus bar 31 and a negative bus bar 32. A plurality of positive connection portions 33 are provided on the positive bus bar 31 and arranged at intervals in the first direction. A plurality of negative connection portions 34 are provided on the negative bus bar 32 and arranged at intervals in the first direction.

[0048] Specifically, the positive bus bar 31 and the negative bus bar 32 are arranged at intervals in the second direction on the upper surfaces of multiple groups of core packages 2. One end of the positive connection portion 33 is connected to the positive bus bar 31, and the other end of the positive connection portion 33 extends downward along the side surface of the core package 2. One end of the negative connection portion 34 is connected to the negative bus bar 32, and the other end of the negative connection portion 34 extends downward along the side surface of the core package 2. The cross sections of the positive bus bar 31 and the negative bus bar 32 are L-shaped to better cooperate with the core package 2.

[0049] Both the positive electrode connection part 33 and the negative electrode connection part 34 are provided with first reinforcing ribs 35. The first reinforcing ribs 35 extend along the extending direction of the connection part, and are used to improve the structural strength of the connection part. The connection part is provided with second reinforcing ribs 36 at the connection with the positive electrode bus bar 31 and the negative electrode bus bar 32, and is used to improve the connection strength between the connection part and the bus bar.

[0050] Specifically, the high-capacity lithium-ion battery further includes a positive electrode column 71 and a negative electrode column 72. The positive electrode column 71 sequentially passes through the positive electrode bus bar 31, the first frame body 41 and the top cover 51, and the negative electrode column 72 sequentially passes through the negative electrode column 72, the negative electrode bus bar 32, the second frame body 42 and the top cover 51.

[0051] In some embodiments, the lower surface of the first frame body 41 is provided with a first limiting part 416 and a second limiting part 417. The first limiting part 416 and the second limiting part 417 are arranged at intervals along the second direction. The positive electrode bus bar 31 is arranged in the first limiting part 416 to make the installation of the positive electrode bus bar 31 stable, and the negative electrode bus bar 32 is arranged in the second limiting part 417 to make the installation of the negative electrode bus bar 32 stable. The first boss 412 is arranged between the first limiting part 416 and the second limiting part 417.

[0052] In some embodiments, the high-capacity lithium-ion battery further includes a first insulating part 81 and a second insulating part 82. The first insulating part 81 is wrapped on the outer surface of each group of core packs 2, and the second insulating part 82 is wrapped on the outer surface of the housing 1.

[0053] Specifically, the first insulating part 81 is a tape, and the outer surface of each group of core packs 2 is covered with adhesive tape for insulation to improve the tightness between the first insulating part 81 and each group of core packs 2.

[0054] In some embodiments, the technological process of core cell assembly is as follows:

[0055] First, wrap the first insulating part 81 on the core pack unit 21, form the core pack 2 by connecting at least two core pack units 21 in parallel and connecting them by flat ruler ultrasonic welding. Multiple groups of core packs 2 are arranged in parallel along the first direction and placed between the first frame body 41 and the second frame body 42 for limiting. Laser weld the positive electrode tabs and negative electrode tabs of each group of core packs 2 to the positive electrode connection part 33 and the negative electrode connection part 34 respectively. Then, place the core pack 2 into the accommodation cavity 11 of the housing 1 and flip the core pack 2 to adjust the position of the core pack 2. Weld the top cover 51 at the upper opening 12 of the housing 1, weld the bottom plate 52 at the lower opening of the housing 1, inject electrolyte into the accommodation cavity 11 through the top plate, seal the hole for injecting electrolyte on the top cover 51 after injecting the electrolyte, weld the aluminum plate 61 on the upper surface of the top cover 51, cover the second sealing part on the outer surface of the housing 1, and finally set the bottom patch 62 on the lower surface of the bottom plate 52. The assembly technological process of the high-capacity lithium-ion battery in the embodiment of the present invention is simple and has high safety and reliability.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0057] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0058] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0061] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the scope of protection of the present invention.

Claims

1. A high-capacity lithium-ion battery, characterized in that, Comprising: A housing (1), the housing (1) having a receiving cavity (11), and an electrolyte is provided in the receiving cavity (11); Multiple sets of core packages (2), the multiple sets of core packages (2) are arranged in parallel along a first direction, each set of core packages (2) includes at least two core package (2) units, and at least two of the core package (2) units in each set are arranged in parallel along the first direction; A bus bar (3), the bus bar (3) having a plurality of positive connection portions (33) arranged in parallel along the first direction and a plurality of negative connection portions (34) arranged in parallel along the first direction, the plurality of positive connection portions (33) and the plurality of negative connection portions (34) are arranged at intervals along a second direction and correspond to each other one by one, the second direction is orthogonal to the first direction, the multiple sets of core packages (2) are arranged between the positive connection portions (33) and the negative connection portions (34), the multiple sets of core packages (2) correspond to the plurality of positive connection portions (33) one by one, the positive electrode tab of each set of core packages (2) is connected to the positive connection portion (33), and the negative electrode tab of each set of core packages (2) is connected to the negative connection portion (34).

2. The high-capacity lithium-ion battery according to claim 1, wherein, It further includes a first frame body (41) and a second frame body (42), the first frame body (41) is arranged on the top surface of the receiving cavity (11), the second frame body (42) is arranged on the bottom surface of the receiving cavity (11), and the first frame body (41) and the second frame body (42) are used to limit the multiple sets of core packages (2).

3. The high-capacity lithium-ion battery according to claim 2, wherein, The first frame body (41) is a plastic part.

4. The high-capacity lithium-ion battery according to claim 2, characterized in that, The lower surface of the first frame body (41) is provided with a plurality of first bosses (412), the plurality of first bosses (412) are arranged at intervals along the first direction, the upper surface of the second frame body (42) is provided with a plurality of second bosses (422), the plurality of second bosses (422) are arranged at intervals along the first direction, the plurality of first bosses (412) and the plurality of second bosses (422) correspond to each other one by one, an installation position (413) is formed between adjacent first bosses (412), the multiple sets of core packages (2) correspond to the plurality of installation positions (413) one by one, and each set of core packages (2) is arranged in the installation position (413).

5. The high-capacity lithium-ion battery according to claim 2, characterized in that, The first frame body (41) is provided with a plurality of exhaust holes (414), the plurality of exhaust holes (414) are arranged at intervals along the first direction, and the plurality of exhaust holes (414) correspond to the multiple sets of core packages (2) one by one.

6. The high-capacity lithium-ion battery according to claim 4, wherein The second frame body (42) is provided with a plurality of through hole grooves (423), the plurality of through hole grooves (423) are arranged at intervals along the first direction, the through hole grooves (423) extend along the second direction, the plurality of through hole grooves (423) correspond to the plurality of second bosses (422) one by one, the through hole grooves (423) and the second bosses (422) are arranged along the second direction, and the electrolyte in the receiving cavity (11) can contact the core package (2) through the through hole grooves (423).

7. The high-capacity lithium-ion battery according to claim 6, wherein, The top surface of the housing (1) has an upper opening (12), and the bottom surface of the housing (1) has a lower opening. The high-capacity lithium-ion battery further includes a top cover (51) and a bottom plate (52). The top cover (51) is disposed at the upper opening (12) for covering the upper opening (12), and the bottom plate (52) is disposed at the lower opening for covering the lower opening. The first frame body (41) is disposed below the top cover (51). The upper surface of the bottom plate (52) has a plurality of heat conducting fins (521), and the plurality of heat conducting fins (521) are arranged at intervals in the first direction. Each group of core packages (2) is disposed between two adjacent heat conducting fins (521), and the heat conducting fins (521) can be fitted into the through-hole grooves (423).

8. The high-capacity lithium-ion battery according to claim 4, characterized in that, The bus bar (3) includes a positive bus bar (31) and a negative bus bar (32). A plurality of positive connection portions (33) are disposed on the positive bus bar (31) and arranged at intervals in the first direction, and a plurality of negative connection portions (34) are disposed on the negative bus bar (32) and arranged at intervals in the first direction.

9. The high-capacity lithium-ion battery according to claim 8, wherein, The lower surface of the first frame body (41) is provided with a first limiting portion (416) and a second limiting portion (417). The first limiting portion (416) and the second limiting portion (417) are arranged at intervals in the second direction. The positive bus bar (31) is disposed in the first limiting portion (416), the negative bus bar (32) is disposed in the second limiting portion (417), and the first boss (412) is disposed between the first limiting portion (416) and the second limiting portion (417).

10. The high-capacity lithium-ion battery according to any one of claims 1-9, characterized in that, It further includes a first insulating member (81) and a second insulating member (82). The first insulating member (81) wraps the outer surface of each group of core packages (2), and the second insulating member (82) wraps the outer surface of the housing (1).

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