CN219779013U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: the battery comprises a battery shell, a pole assembly and a battery core, wherein the battery shell comprises a first shell part and a second shell part which are connected, the first shell part and the second shell part are respectively provided with a first large surface and a second large surface, the first large surface and the second large surface are oppositely arranged, one side of the first shell part, which is away from the second shell part, is provided with a recess, the recess is positioned on the first large surface, and the depth of the recess is not more than four fifths of the height of the second shell part along the direction perpendicular to the second large surface; the pole component is arranged in the recess; the battery core is arranged in the battery shell; and is electrically connected with the pole assembly. The battery provided by the utility model improves the space utilization rate of the battery during battery grouping.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

In the related art, a pole is arranged on a battery shell, and when a plurality of batteries are grouped, the pole protrudes from the surface of the battery shell, so that the space utilization rate of the batteries in the grouping process is affected.

Disclosure of Invention

The utility model provides a battery, which improves the space utilization rate of the battery during battery grouping.

The present utility model provides a battery comprising:

the battery shell comprises a first shell piece and a second shell piece which are connected, wherein the first shell piece and the second shell piece are respectively provided with a first large surface and a second large surface, the first large surface and the second large surface are oppositely arranged, a recess is formed on one side of the first shell piece, which faces away from the second shell piece, and is positioned on the first large surface, and the depth of the recess is smaller than the height of the second shell piece and is not more than four fifths of the height of the second shell piece along the direction perpendicular to the second large surface;

the pole assembly is arranged in the recess;

and the battery core is arranged in the battery shell and is electrically connected with the pole column assembly.

According to the battery provided by the disclosure, the first shell part of the battery shell is provided with the recess on one side deviating from the second shell part, the recess is positioned on the first large surface of the first shell part, the pole assembly is arranged in the recess, the storage of the pole assembly is realized, the condition that the pole assembly protrudes out of the first large surface of the first shell part is improved, and then when a plurality of batteries are grouped, the space utilization rate of the battery group, which is influenced by the pole assembly, is prevented from being generated between adjacent batteries, and the space utilization rate of the battery group is improved, so that the energy density of the battery group can be improved; meanwhile, an avoidance structure for avoiding the protruding pole column assembly is arranged on the second shell piece of the adjacent battery, so that the difficulty in forming the battery shell is reduced, and the manufacturing cost of the battery shell is saved; in addition, by making the depth of the recess not greater than four fifths of the height of the second case member in the direction perpendicular to the second large surface, the recess depth is prevented from excessively large pressing the accommodating space of the electric connection member, the insulating member, the tab, and the like inside the battery case.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view showing a structure of a battery according to an exemplary embodiment;

fig. 2 is a schematic view illustrating a structure of a battery pack according to an exemplary embodiment;

FIG. 3 is an enlarged partial schematic view of a battery pack according to an exemplary embodiment;

fig. 4 is a schematic front view of a battery housing according to an exemplary embodiment;

FIG. 5 is a schematic diagram of a reverse side of a battery housing according to an exemplary embodiment;

fig. 6 is a schematic side view of a battery housing according to an exemplary embodiment;

fig. 7 is a structural exploded view of a battery case according to an exemplary embodiment;

FIG. 8 is a schematic diagram of a first housing piece in reverse according to an example embodiment;

fig. 9 is a schematic diagram of a cell structure according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a battery;

100. a battery case; 101. a first major surface; 102. a second major surface; 103. a first minor surface; 104. a second minor surface; 110. a first housing member; 120. a second housing member; 130. a recess; 140. a concave portion; 150. a protrusion; 160. a groove; 170. a liquid injection hole;

200. a pole assembly; 210. a first pole assembly; 220. a second post assembly; 231. a first portion; 232. a second portion; 233. a connection surface;

300. a battery cell; 310. a first sub-cell; 311. the first battery cell body; 312. a first positive electrode tab; 313. a first negative electrode tab; 320. a second sub-cell; 321. the second cell body; 322. a second positive electrode tab; 323. and the second negative electrode tab.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Embodiments of the present disclosure first provide a battery, as shown in fig. 1 to 9, a battery 10 including: the battery case 100, the pole assembly 200 and the battery cell 300, the battery case 100 comprises a first case member 110 and a second case member 120 which are connected, the first case member 110 and the second case member 120 are respectively formed with a first large surface 101 and a second large surface 102, the first large surface 101 and the second large surface 102 are oppositely arranged, a recess 130 is formed on one side of the first case member 110 facing away from the second case member 120, and the recess 130 is positioned on the first large surface 101, and the depth of the recess 130 is not more than four fifths of the height of the second case member 120 in the direction perpendicular to the second large surface 102; the pole assembly 200 is disposed within the recess 130; the battery cell 300 is disposed in the battery case 100 and electrically connected to the post assembly 200.

According to the battery 10 provided by the disclosure, the recess 130 is formed on one side, facing away from the second housing part 120, of the first housing part 110 of the battery housing 100, and the recess 130 is positioned on the first large surface 101 of the first housing part 110, and the pole assembly 200 is arranged in the recess 130, so that the storage of the pole assembly 200 is realized, the condition that the pole assembly 200 protrudes out of the first large surface 101 of the first housing part 110 is improved, and further, when a plurality of batteries 10 are grouped, the space utilization rate of battery grouping is prevented from being influenced by the pole assembly 200 between adjacent batteries 10, and the space utilization rate when a plurality of batteries are grouped is improved, so that the energy density of the battery pack can be improved; meanwhile, the avoidance structure of the avoidance convex pole assembly 200 arranged on the second shell piece 120 of the adjacent battery 10 can be avoided, the forming difficulty of the battery shell 100 is reduced, and the manufacturing cost of the battery shell 100 is reduced; in addition, by making the depth of the recess 130 not greater than four fifths of the height of the second case member 120 in the direction perpendicular to the second large surface 102, it is avoided that the depth of the recess 130 is excessively large to press the accommodating space of the electric connection member, the insulating member, the tab, and the like inside the battery case 100.

The depth of the recess 130 may be equal to four fifths of the height of the second housing member 120, or the depth of the recess 130 may be equal to three fifths of the height of the second housing member 120, or the depth of the recess 130 may be equal to two fifths of the height of the second housing member 120, or the depth of the recess 130 may be equal to one fifth of the height of the second housing member 120, etc.

It should be noted that the battery 10 includes the cell 300 and an electrolyte, and is capable of performing a minimum unit of electrochemical reaction such as charge/discharge. The battery cell 300 refers to a unit formed by winding or laminating a stacked portion. The battery cell 300 includes a battery cell body, a first tab, and a second tab. The cell body has a first pole piece, a second pole piece, and a diaphragm disposed between the first pole piece and the second pole piece, stacked on each other, such that the pairs of the first pole piece and the second pole piece are stacked to form a stacked cell. The first tab is connected with the first pole piece, the second tab is connected with the second pole piece, and the polarities of the first tab and the second tab are opposite. Alternatively, the battery cell 300 may be a winding type battery cell, that is, a first pole piece, a second pole piece opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

In one embodiment, as shown in fig. 1, the battery 10 may be a prismatic battery, that is, the battery 10 may be a quadrangular-type battery, and the quadrangular-type battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly straight line, and corners between sides are not necessarily right angles, and may be arc transitions. The quadrangular type battery can be a laminated battery, is convenient to group, and can be processed to obtain a battery with longer length.

In one embodiment, as shown in fig. 7, the first housing member 110 is a cover plate, and a protrusion 150 is formed on a side of the cover plate facing away from the second housing member 120, such that a recess 130 is formed on at least one side of the protrusion 150. By forming the protrusion 150 on the side of the first housing member 110 facing away from the second housing member 120, the recess 130 is formed in the region where the protrusion 150 is not formed on the side of the first housing member 110 facing away from the second housing member 120, and the pole assembly 200 is accommodated by the recess 130, thereby improving the condition that the pole assembly 200 protrudes from the first large surface 101 of the first housing member 110.

As shown in fig. 7 and 8, by forming the protrusion 150 on the side of the cover plate facing away from the second housing member 120, which corresponds to forming the groove 160 on the side of the cover plate facing toward the second housing member 120, the battery cell 300 can be disposed in the groove 160, and the positioning effect on the battery cell 300 when it is put into the case and the limiting effect after it is put into the case can be formed by the groove 160. Of course, it is not excluded that the battery cells 300 may be laminated in the grooves 160.

In one embodiment, as shown in fig. 7, the first housing member 110 is a cover plate, the second housing member 120 is a box body matched with the cover plate, the box body is formed with a containing cavity, and the battery cell 300 is located in the containing cavity.

The inner surface of the second housing member 120 opposite to the first housing member 110 is a plane, i.e., the bottom of the box body is a plane, so that the flatness of the bottom surface of the second housing member 120 is ensured, and the second housing member 120 is convenient to form and has a higher space utilization rate. Of course, the inner surface of the second housing member 120 opposite to the first housing member 110 may not be planar, and the inner surface of the second housing member 120 opposite to the first housing member 110 may be formed with a protrusion or groove structure, which is not limited by the present disclosure.

In one embodiment, as shown in fig. 3, the pole assembly 200 comprises an L-shaped pole comprising a first portion 231 and a second portion 232 connected, at least part of the first portion 231 being located within the recess 130, the second portion 232 extending from an end connected to the first portion in a direction away from the recess 130. By having at least part of the first portion located within recess 130, when a plurality of cells are grouped, the occurrence of post assemblies 200 between adjacent cells 10 is ameliorated affecting the space utilization of the battery grouping.

Wherein the second portion 232 has a connection surface 233 for connecting a busbar. The connection of the pole assembly 200 to the bus bar is achieved by the connection surface 233 of the second portion 232. The second portion 232 extends from the end connected to the first portion 231 in a direction away from the recess 130, facilitating connection of the bus bar from the side of the battery case 100 to the post assembly 200.

Wherein the connection surface 233 is perpendicular to the first large surface 101, and the connection surface 233 is facilitated to be connected to the bus bar of the side of the battery case 100 by making the connection surface 233 perpendicular to the first large surface 101; alternatively, the first portion 231 is perpendicular to the second portion 232, and the second portion 232 is parallel to the first large surface 101 by making the first portion 231 perpendicular to the second portion 232, i.e., the connection surface 233 is perpendicular to the first large surface 101, so that the connection surface 233 is connected to the bus bar of the side of the battery case 100; alternatively, the connection surface 233 is perpendicular to the first large surface 101 and the first portion 231 is perpendicular to the second portion 232, and by making the connection surface 233 perpendicular to the first large surface 101 and the first portion 231 perpendicular to the second portion 232, the second portion 232 is parallel to the first large surface 101, and the connection surface 233 is perpendicular to the first large surface 101, the assembly of the pole assembly 200 on the first case member 110 is facilitated, and the connection surface 233 is facilitated to be connected to the bus bar of the side of the battery case 100.

Wherein the outer surface of the first portion 231 is not disposed beyond the recess 130, and by disposing the outer surface of the first portion 231 beyond the recess 130 such that the first portion 231 is received in the recess 130, the influence of the post assembly 200 between adjacent cells 10 is avoided; alternatively, at least a portion of the second portion 232 is positioned outside the recess 130, such that the connection surface 233 is positioned outside the recess 130, thereby facilitating connection of the connection surface 233 with the bus bar of the side of the battery case 100; alternatively, the outer surface of the first portion 231 is not disposed beyond the recess 130 and at least part of the second portion 232 is located outside the recess 130, so that the connection stability of the terminal assembly 200 with the first housing member 110 is high by making the outer surface of the first portion 231 not disposed beyond the recess 130 and at least part of the second portion 232 located outside the recess 130, and the connection surface 233 is located outside the recess 130, thereby facilitating the connection of the connection surface 233 with the bus bars of the side of the battery housing 100.

In one embodiment, as shown in fig. 7 and 8, there are two protrusions 150, and two protrusions 150 are disposed along the length direction X of the first housing member 110, with a recess 130 formed between the two protrusions 150. By forming two protrusions 150 on the side of the cover plate facing away from the second housing member 120, a recess 130 is formed between the two protrusions 150 of the cover plate and in the region where the protrusions 150 are not formed on the side facing away from the second housing member 120, and the pole assembly 200 is accommodated in the recess 130, so that the situation that the pole assembly 200 protrudes from the first large surface 101 of the first housing member 110 is improved. Meanwhile, two protrusions 150 are formed on one side, away from the second housing member 120, of the cover plate, corresponding to two grooves 160 formed on one side, facing the second housing member 120, of the cover plate, so that two sub-electric cores can be respectively arranged in the two grooves 160, and positioning effect and limiting effect after the two sub-electric cores are put into the housing can be formed through the two grooves 160.

In one embodiment, as shown in fig. 6 and 7, the recess 130 is disposed at a middle position in the length direction X of the first housing member 110, that is, the two protrusions 150 on the first housing member 110 have the same length. The two protrusions 150 have the same length, which not only facilitates the formation of the two protrusions 150, but also ensures the uniformity of the structure of the first case member 110, thereby ensuring the relatively uniform strength of the battery case 100 and thus improving the overall strength of the battery case 100.

Wherein, the two protrusions 150 can be formed by stamping to form two protrusions 150 on the surface of the first housing member 110, which not only facilitates the forming of the first housing member 110, but also improves the forming effect of the first housing member 110 and ensures the structural strength of the first housing member 110.

In one embodiment, as shown in fig. 1 to 3, two pole assemblies 200 are disposed in the recess 130, and are disposed at intervals in the width direction Y of the battery case 100, that is, the two pole assemblies 200 are disposed on the same surface, so that the installation is convenient, the assembly efficiency can be improved, and the pole assemblies 200 can be ensured to have a reliable supporting surface, thereby ensuring the stability of the pole assemblies 200.

The recess 130 is disposed at a middle position of the first housing member 110 in the length direction X, that is, the pole assembly 200 is disposed at a middle portion of the first housing member 110, so as to avoid the problem that the pole assembly 200 is disposed at an end portion, resulting in a longer electrical connection path between the batteries 10.

In one embodiment, as shown in fig. 9, the battery cell 300 includes a first sub-battery cell 310 and a second sub-battery cell 320, where the first sub-battery cell 310 and the second sub-battery cell 320 are disposed along the length direction of the battery case 100, that is, the first sub-battery cell 310 and the second sub-battery cell 320 may form a left-right arrangement structure, so that the overall length of the battery cell 300 is increased, and in the forming process of the independent first sub-battery cell 310 and second sub-battery cell 320, the battery cell 300 with a larger forming length may be avoided, so that the forming efficiency may be improved, and the accuracy after forming may be improved, so as to ensure the usability of the subsequently formed battery cell 300.

In one embodiment, as shown in fig. 9, the first sub-battery cell 310 includes a first battery cell body 311, a first positive electrode tab 312, and a first negative electrode tab 313, where the first positive electrode tab 312 and the first negative electrode tab 313 extend from one end of the first battery cell body 311 along a length direction X of the battery case 100; the second sub-battery 320 includes a second battery body 321, a second positive electrode tab 322, and a second negative electrode tab 323, where the second positive electrode tab 322 and the second negative electrode tab 323 extend from one end of the second battery body 321 along the length direction X of the battery case 100.

The first positive electrode tab 312 is electrically connected with the second positive electrode tab 322, the first negative electrode tab 313 is electrically connected with the second negative electrode tab 323, the extending directions of the first positive electrode tab 312 and the second positive electrode tab 322 are opposite, and the extending directions of the first negative electrode tab 313 and the second negative electrode tab 323 are opposite, so that the parallel connection of the first battery cell 300 and the second battery cell 300 is realized, and the two electrode leading-out ends of the battery cell can be led out from the same side of the battery case 100, so that the battery 10 is convenient to assemble.

The two electrode post assemblies 200 are provided, the first positive electrode tab 312 and the second positive electrode tab 322 are electrically connected with the first electrode post assembly 210, and the first negative electrode tab 313 and the second negative electrode tab 323 are electrically connected with the second electrode post assembly 220, so that the first electrode post assembly 210 and the second electrode post assembly 220 can be respectively used as two electrode outlets of the battery 10.

In one embodiment, the length of the battery case 100 is not less than 500mm, and the length of the battery case 100 is, for example, 500mm, 550mm, 600mm, 650mm, or the like.

In one embodiment, the depth of the recess 130 is 1mm to 20mm, such as 1mm, 3mm, 5mm, 7mm, 10mm, 13mm, 15mm, 17mm, 20mm, etc., in a direction perpendicular to the second major surface 102 (Z direction shown in FIG. 1), which is not specifically recited herein. By making the depth of the recess 130 be 1 mm-20 mm, on one hand, the condition that the pole assembly 200 protrudes from the first large surface 101 of the first housing member 110 can be improved through the recess 130, so that when a plurality of batteries are grouped, the influence on the arrangement of the adjacent batteries 10 caused by the protrusion of the pole assembly 200 is improved, and the space utilization rate of the plurality of batteries in the grouping process is improved; on the other hand, the depth of the recess 130 is small, so that the excessive depth of the recess 130 is prevented from squeezing the accommodating space of the electric connector, the insulator, the tab and other parts inside the battery case 100. Of course, the depth of the recess 130 may be less than 1mm or greater than 20mm, as the disclosure is not limited thereto.

In one embodiment, as shown in fig. 4, the battery case 100 is further formed with two first small surfaces 103 and two second small surfaces 104 disposed opposite to each other, the first small surfaces 103 having an area larger than that of the second small surfaces 104, and the first large surfaces 101 and the second large surfaces 102 each having an area larger than that of the first small surfaces 103;

as shown in fig. 4, the first small surface 103 is formed with a recess 140 communicating with the recess 130, and the recess 140 is used to receive a bus bar for connection with the post assembly 200, so that space utilization when the batteries are grouped can be improved, and connection of the bus bar with the post assembly 200 can be conveniently achieved.

In one embodiment, as shown in fig. 7, the first housing member 110 is provided with a liquid injection hole 170, the liquid injection hole 170 is located between the two pole assemblies 200, and the electrolyte is injected into the battery cell 300 through the liquid injection hole 170, so that the electrolyte can uniformly infiltrate the first sub-battery cell 310 and the second sub-battery cell 320, thereby improving the infiltration efficiency of the electrolyte. Of course, the injection holes may be located at one side of the two post assemblies 200, or on a different surface from the battery case 100 than the two post assemblies 200, which is not limited by the present disclosure.

Embodiments of the present disclosure also provide a battery pack including the battery 10 described above.

In this case, as shown in fig. 2, when stacking a plurality of cells 10 into a battery pack, the large surfaces of the maximum areas of the plurality of cells 10 are stacked together, that is, the stacking direction of the plurality of cells 10 is perpendicular to the large surfaces of the cells 10. By making the stacking direction of the plurality of cells 10 perpendicular to the large surface of the cells 10, the space occupied by the plurality of cells 10 after stacking can be made small, and thus the energy density of the plurality of cells after grouping can be relatively improved.

The battery pack provided by the embodiment of the disclosure includes the battery 10, the recess 130 is formed on one side of the first housing member 110 of the battery housing 100, which is away from the second housing member 120, and the recess 130 is located on the first large surface 101 of the first housing member 110, and the pole assembly 200 is disposed in the recess 130, so that the storage of the pole assembly 200 is realized, the situation that the pole assembly 200 protrudes from the first large surface 101 of the first housing member 110 is improved, and further, when a plurality of batteries 10 are grouped, the space utilization rate of the battery group is prevented from being influenced by the pole assembly 200 between adjacent batteries 10, and the space utilization rate when a plurality of batteries are grouped is improved, so that the energy density of the battery pack can be improved; meanwhile, the avoidance structure of the avoidance convex pole assembly 200 arranged on the second shell piece 120 of the adjacent battery 10 can be avoided, the forming difficulty of the battery shell 100 is reduced, and the manufacturing cost of the battery shell 100 is reduced; in addition, by making the depth of the recess 130 not greater than four fifths of the height of the second case member 120 in the direction perpendicular to the second large surface 102, it is avoided that the depth of the recess 130 is excessively large to press the accommodating space of the electric connection member, the insulating member, the tab, and the like inside the battery case 100.

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

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries.

It should be noted that, a plurality of batteries may be disposed in the battery case after forming the battery module, and may be fixed by the end plate and the side plate. The plurality of cells may be disposed directly in the cell case, i.e., without grouping the plurality of cells, at which time the end plates and the side plates may be removed.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (14)

1. A battery, comprising:

a battery case (100), the battery case (100) comprising a first case member (110) and a second case member (120) connected, the first case member (110) and the second case member (120) being formed with a first large surface (101) and a second large surface (102), respectively, the first large surface (101) and the second large surface (102) being disposed opposite to each other, a recess (130) being formed in a side of the first case member (110) facing away from the second case member (120), and the recess (130) being located on the first large surface (101), a depth of the recess (130) being not more than four fifths of a height of the second case member (120) in a direction perpendicular to the second large surface (102);

-a pole assembly (200), the pole assembly (200) being disposed within the recess (130);

and the battery cell (300) is arranged in the battery shell (100) and is electrically connected with the pole assembly (200).

2. The battery according to claim 1, wherein the depth of the recess (130) is 1mm to 20mm.

3. The battery according to claim 1, characterized in that the first housing part (110) is a cover plate, which is formed with a projection (150) on a side facing away from the second housing part (120), so that the recess (130) is formed on at least one side of the projection (150).

4. A battery according to claim 3, wherein there are two protrusions (150) to form the recess (130) between two protrusions (150);

wherein two of the protrusions (150) are provided along the length direction of the first housing member (110).

5. The battery according to claim 1, wherein an inner surface of the second housing member (120) opposite the first housing member (110) is planar.

6. The battery of claim 1, wherein the post assembly (200) comprises a first portion (231) and a second portion (232) connected, at least part of the first portion (231) being located within the recess (130), the second portion (232) extending from an end connected to the first portion (231) in a direction away from the recess (130);

wherein the second portion (232) has a connection surface (233) for connecting a busbar.

7. The battery according to claim 6, characterized in that the connection surface (233) is perpendicular to the first large surface (101) and/or the first portion (231) is perpendicular to the second portion (232).

8. The battery according to claim 6, characterized in that the outer surface of the first portion (231) is not arranged beyond the recess (130) and/or that at least part of the second portion (232) is located outside the recess (130).

9. The battery according to any one of claims 1 to 8, wherein the electrical core (300) includes a first sub-electrical core (310) and a second sub-electrical core (320), the first sub-electrical core (310) and the second sub-electrical core (320) being disposed along a length direction of the battery case (100), the terminal assembly (200) electrically connecting the first sub-electrical core (310) and the second sub-electrical core (320) at the same time;

wherein the recess (130) is provided at an intermediate position in the longitudinal direction of the first housing member (110).

10. The battery according to claim 9, wherein there are two of said post assemblies (200), both of said post assemblies (200) being located within said recess (130).

11. The battery according to claim 10, wherein a liquid injection hole (170) is provided in the first housing member (110), the liquid injection hole (170) being located between two of the pole assemblies (200).

12. The battery according to any one of claims 1 to 8, wherein the battery case (100) is further formed with two first small surfaces (103) and two second small surfaces (104) that are disposed opposite to each other, an area of the first small surfaces (103) being larger than an area of the second small surfaces (104), and an area of each of the first large surfaces (101) and the second large surfaces (102) being larger than an area of the first small surfaces (103);

wherein a recess (140) communicating with the recess (130) is formed on the first small surface (103), the recess (140) being for receiving a busbar for connection with the pole assembly (200).

13. The battery according to any one of claims 1 to 8, wherein the length of the battery case (100) is not less than 500mm.

14. The battery according to any one of claims 1 to 8, wherein the battery is a quadrangular-type battery.