CN216054800U

CN216054800U - Current collector, battery cell, laminated battery cell, battery cell monomer and energy storage device

Info

Publication number: CN216054800U
Application number: CN202122224444.1U
Authority: CN
Inventors: 辛民昌
Original assignee: Jiuhuan Energy Storage Technology Co ltd
Current assignee: Jiuhuan Energy Storage Technology Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-03-15
Anticipated expiration: 2031-09-14

Abstract

The utility model discloses a current collector, an electric core, a laminated electric core, an electric core monomer and an energy storage device.A lug partition is arranged on the long edge of an electrode area, and the length of the long edge of the electrode area is greater than the length of the wide edge of the electrode area, so that electrons can be conducted towards the lug partition closest to the current collector in a current collector body, and the conducting distance of the electrons in the current collector body can be reduced; similarly, the length of the electrode area can be set according to different use scenes without limitation, and only the lug partitions are arranged on the long edge of the electrode area according to the set spacing distance; through reducing electron conduction distance, can reduce the resistance of electron conduction, reduce the inside heat that produces because of the resistance of electric core to can control electric core better and generate heat, improve electric core operational safety and stability.

Description

Current collector, battery cell, laminated battery cell, battery cell monomer and energy storage device

Technical Field

The utility model belongs to the technical field of electrochemical energy storage, and particularly relates to a current collector, an electric core, a laminated electric core, an electric core monomer and an energy storage device.

Background

The surface area of the existing battery cell is generally small, so that the lug of the battery cell can be arranged at any position, and the position where the lug is arranged cannot cause large influence on the resistance of electronic conduction in the battery cell. With the development of the technology, the surface area of the battery cell is larger and larger, and the capacity of a single battery cell is increased. However, in the conventional battery cell, tabs are still disposed at two ends in the length direction of the battery cell, and when electrons are conducted from one end of the current collector to the other end of the current collector, the conduction path is long, and the resistance of conduction is increased. When the resistance is increased due to the increase of the electron conduction path in the current collector, the heat productivity inside the battery cell due to the increase of the resistance is also correspondingly increased, which is not beneficial to the safety of the battery cell.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a current collector, a battery cell, a stacked battery cell, a battery cell monomer, and an energy storage device, which can effectively reduce the length of an electron conduction path, thereby reducing the resistance of the current collector.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model firstly provides a current collector, which comprises a current collector body, wherein an electrode area and a tab area are arranged on the current collector body, and the electrode area is square and has a length L₀And width W₀And L is₀＞W_O；

The electrode lug area comprises one or at least two electrode lug subareas arranged at intervals, and the side length of the electrode lug subareas is L₀On the edge of (a).

Furthermore, the electrode lugs are all arranged in the electrode area in a partition mode, wherein one side length of one electrode lug is L₀The edge of (a); or the lugs are respectively arranged on the two side lengths of the electrode area in a partitioning manner and have the length of L₀On the edge of (a).

Furthermore, when the electrode lugs are respectively arranged on the two side lengths of the electrode area in a partitioning manner, the side lengths are L₀When the side of the electrode is divided into two parts, the length of the side of all the lug subareas parallel to the electrode area is L₀Has a gap between the projections on the straight line of the sides.

Further, the side length of the electrode area is W₀The edge of the battery is provided with at least one lug partition at intervals.

The utility model also provides a battery cell, which comprises a first current collector and a second current collector, wherein a first electrode material layer is arranged on the first current collector, and a second electrode material layer is arranged on the second current collector; a solid electrolyte layer is arranged between the first electrode material layer and the second electrode material layer, or a diaphragm and electrolyte are arranged between the first electrode material layer and the second electrode material layer;

the first current collector and the second current collector are both the current collectors; enabling an electrode area and an electrode lug area arranged on the first current collector to be a first electrode area and a first electrode lug area respectively; the electrode area and the polar ear area which are arranged on the second current collector are respectively a second electrode area and a second polar ear area; the first electrode material layer is arranged on the first electrode region, and the second electrode material layer is arranged on the second electrode region; the first pole ear area is formed into a first pole ear in a pole ear partition mode, and the second pole ear area is formed into a second pole ear in a pole ear partition mode.

Further, in the view direction perpendicular to the first current collector, the electrode regions of the first current collector and the second current collector are overlapped, the first tab and the second tab are arranged on the same side of the electrode region, or the first tab and the second tab are respectively arranged on two sides of the electrode region.

The utility model also provides a laminated battery cell, which comprises at least two battery cells, wherein the first current collector or the second current collector of two adjacent battery cells are laminated together; one or at least two first tabs are correspondingly arranged on all the first current collectors, and the correspondingly arranged first tabs are connected together; all the second current collectors are correspondingly provided with one or at least two second pole lugs, and the correspondingly arranged second pole lugs are connected together.

Further, in a view direction perpendicular to the first current collector, all the first electrode regions and the second electrode regions are overlapped; the first pole lugs which are correspondingly arranged are partially or completely overlapped, and the second pole lugs which are correspondingly arranged are partially or completely overlapped.

Further, when the first electrode region and the second electrode region are simultaneously provided with the first tab and the second tab at the same side, a gap is formed between the first tab and the second tab at the same side.

Further, the first electrode regions and the second electrode regions are arranged on the same side of the first electrode regions and the second electrode regions in a staggered mode.

Furthermore, the first electrode lugs are correspondingly arranged and connected in a welding mode, and the second electrode lugs are correspondingly arranged and connected in a welding mode.

The utility model also provides a laminated battery cell which comprises at least three first laminated current collectors arranged at intervals, wherein the side surfaces of two sides of each first laminated current collector are provided with a third electrode material layer or a fourth electrode material layer; the third electrode material layer and the fourth electrode material layer are respectively arranged on the opposite side surfaces of the two adjacent first laminated current collectors; a solid electrolyte layer is arranged between the third electrode material layer and the fourth electrode material layer, or a diaphragm and electrolyte are arranged between the third electrode material layer and the fourth electrode material layer;

all the first laminated current collectors adopt the current collectors; the first laminated current collector provided with the third electrode material layer is a third current collector, and the first laminated current collector provided with the fourth electrode material layer is a fourth current collector;

the third electrode material layer is arranged on the electrode region of the third current collector, and the fourth electrode material layer is arranged on the electrode region of the fourth current collector; the lug partition of the third current collector forms a third lug, and the lug partition of the fourth current collector forms a fourth lug;

one or at least two third lugs are correspondingly arranged on all the third current collectors, and the correspondingly arranged third lugs are connected together; all the fourth current collectors are correspondingly provided with one or at least two fourth lugs, and the fourth lugs are correspondingly connected together.

Further, in a view direction perpendicular to the third current collector, the electrode regions of all the third current collector and the fourth current collector are overlapped; the third pole ears which are correspondingly arranged are partially or completely overlapped, and the fourth pole ears which are correspondingly arranged are partially or completely overlapped.

Further, when the same side of the electrode area is simultaneously provided with the third tab and the fourth tab, a gap is formed between the third tab and the fourth tab.

Further, the third electrode lugs and the fourth electrode lugs arranged on the same side of the electrode area are arranged in a staggered mode.

Furthermore, the third lugs are correspondingly arranged and are welded with each other, and the fourth lugs are correspondingly arranged and are welded with each other.

The utility model also provides a laminated battery cell, which comprises at least two first battery cell units which are laminated together, wherein an insulating isolation layer is arranged between every two adjacent first battery cell units;

the first cell unit comprises at least one cell device, the cell device comprises a fifth current collector and a sixth current collector, a fifth electrode material layer is arranged on the fifth current collector, a sixth electrode material layer is arranged on the sixth current collector, a solid electrolyte layer is arranged between the fifth electrode material layer and the sixth electrode material layer, or a diaphragm and electrolyte are arranged between the fifth electrode material layer and the sixth electrode material layer;

the fifth current collector and the sixth current collector adopt the current collectors; the fifth electrode material layer is arranged on the electrode region of the fifth current collector, and the sixth electrode material layer is arranged on the electrode region of the sixth current collector; the lug partition of the fifth current collector forms a fifth lug, and the lug partition of the sixth current collector forms a sixth lug;

the first cell unit comprises one cell device or at least two cell devices, and when the first cell unit comprises at least two cell devices, fifth current collectors or sixth current collectors of two adjacent cell devices are overlapped together; one or at least two fifth tabs are correspondingly arranged on all the fifth current collectors in the first battery cell unit, and the correspondingly arranged fifth tabs are connected together; one or at least two sixth pole lugs are correspondingly arranged on all the sixth current collectors in the first battery cell unit, and the correspondingly arranged sixth pole lugs are connected together;

and in two adjacent first cell units, the fifth tab of one of the first cell units and the sixth tab of the other first cell unit are connected together.

Further, in a view direction perpendicular to the fifth current collector, the electrode regions of all the fifth current collector and the sixth current collector are overlapped; in the same first cell unit, the correspondingly arranged fifth tabs are partially or completely overlapped, and the correspondingly arranged sixth tabs are partially or completely overlapped.

Further, in the same first cell unit, when the fifth tab and the sixth tab are simultaneously arranged on the same side of the electrode region, a gap is formed between the fifth tab and the sixth tab.

Further, the fifth pole lug and the sixth pole lug which are arranged on the same side of the electrode area are arranged in a staggered mode.

Further, all the fifth tabs in the first cell unit are connected in a welding mode; all the sixth pole lugs in the first battery cell unit are connected in a welding mode; in two adjacent first cell units, the fifth tab of one of the first cell units is welded to the sixth tab of the other first cell unit.

Further, in two adjacent first cell units, a fifth tab of one of the first cell units is arranged corresponding to a sixth tab of the other first cell unit; in a view direction perpendicular to the fifth current collector, a fifth tab and a sixth tab, which are correspondingly disposed in two adjacent first cell units, are partially or completely overlapped.

The utility model also provides a laminated battery cell which comprises at least two second battery cell units which are laminated together, wherein an insulating isolation layer is arranged between every two adjacent second battery cell units;

the second battery cell unit comprises at least three second laminated current collectors arranged at intervals, and seventh electrode material layers or eighth electrode material layers are arranged on the side surfaces of two sides of each second laminated current collector; the seventh electrode material layer and the eighth electrode material layer are respectively arranged on the opposite side surfaces of the two adjacent second laminated current collectors; a solid electrolyte layer is arranged between the seventh electrode material layer and the eighth electrode material layer, or a diaphragm and electrolyte are arranged between the seventh electrode material layer and the eighth electrode material layer;

all the second laminated current collectors adopt the current collectors; the second laminated current collector provided with the seventh electrode material layer is a seventh current collector, and the second laminated current collector provided with the eighth electrode material layer is an eighth current collector; the seventh electrode material layer is arranged on the electrode region of the seventh current collector, and the eighth electrode material layer is arranged on the electrode region of the eighth current collector; the lug of the seventh current collector is partitioned to form a seventh lug, and the lug of the eighth current collector is partitioned to form an eighth lug;

one or at least two seventh tabs are correspondingly arranged on all the seventh current collectors in the second battery cell unit, and the correspondingly arranged seventh tabs are connected together; one or at least two eighth pole lugs are correspondingly arranged on all the eighth current collectors in the second battery cell unit, and the correspondingly arranged eighth pole lugs are connected together;

and in two adjacent second cell units, the seventh tab of one of the second cell units and the eighth tab of the other second cell unit are connected together.

Further, in a direction perpendicular to the view of the seventh current collector, the electrode regions of all the seventh and eighth current collectors are overlapped; in the same second cell unit, the seventh tabs correspondingly arranged are partially or completely overlapped, and the eighth tabs correspondingly arranged are partially or completely overlapped.

Further, in the same second cell unit, when the seventh tab and the eighth tab are simultaneously disposed on the same side of the electrode region, a gap is formed between the seventh tab and the eighth tab.

Furthermore, the seventh pole lug and the eighth pole lug which are arranged on the same side of the electrode area are arranged in a staggered mode.

Further, all the seventh tabs in the second cell unit are connected by welding; all the eighth pole lugs in the second battery cell unit are connected in a welding mode; in two adjacent second cell units, the seventh tab of one of the second cell units is welded to the eighth tab of the other second cell unit.

Further, in two adjacent second cell units, a seventh tab of one of the second cell units is arranged corresponding to an eighth tab of the other second cell unit; in a view direction perpendicular to the seventh current collector, a seventh tab and an eighth tab correspondingly arranged in two adjacent second battery cell units partially or completely overlap.

The utility model also provides a battery cell monomer which comprises a monomer shell, wherein the laminated battery cell is arranged in the monomer shell.

Further, the single shell is rectangular and is provided with a long side, a wide side and a thick side, the long side of the single shell is parallel to the long side of the electrode area, and the wide side of the single shell is parallel to the wide side of the electrode area; the side surfaces with the side length being the long side and the thick side of the monomer shell are monomer side surfaces, the monomer side surfaces are provided with liquid injection ports for injecting electrolyte, and the pole ear regions are provided with through holes for circulating the electrolyte.

Further, the two monomer side surfaces of the monomer shell are respectively provided with the liquid injection port.

Furthermore, at least two liquid injection ports are respectively arranged on the side surfaces of the single bodies at intervals.

Furthermore, the side surfaces with the side length of the wide edge and the thick edge of the monomer shell are monomer end surfaces, monomer tabs are arranged on the monomer shell, and the monomer tabs are arranged on the monomer side surfaces and/or the monomer end surfaces.

Further, the monomer utmost point ear includes first monomer utmost point ear and second monomer utmost point ear, first monomer utmost point ear and second monomer utmost point ear set up respectively two on the monomer side, or first monomer utmost point ear and second monomer utmost point ear set up respectively two on the monomer terminal surface.

Furthermore, at least one first monomer lug or second monomer lug is arranged on the side face of each monomer at intervals.

The utility model also provides an energy storage device which comprises a box body, wherein at least one battery cell monomer is arranged in the box body.

Further, the box body is cuboid, and the box body has a length L, a width W and a height H; the single body is cuboid and has a length L ', a width W ' and a thickness T '; two side surfaces with the length of length L and the height H in the box body are taken as installation surfaces, and the width W of the box body and the length L' of the single body meet the following requirements:

L＝L’+δ₁or L ═ 2L' + δ₂

Wherein, delta₁And delta₂Respectively, the thickness occupied by other accessory structures in the tank width direction.

Furthermore, one of the two installation surfaces of the box body is an openable operation surface, the other installation surface is a positioning surface, a single body inserting structure for inserting the energy storage single body is arranged on the positioning surface, and the energy storage single body is inserted in the single body inserting structure through the operation surface array; or the like, or, alternatively,

the energy storage device is characterized in that a middle positioning plate parallel to the mounting surface is arranged in the box body, the side surfaces of two sides of the middle positioning plate are positioning surfaces, the positioning surfaces are provided with single body inserting structures for inserting the energy storage monomers, the mounting surfaces of the box body are openable operation surfaces, and the energy storage monomers are inserted and mounted on the single body inserting structures through the operation surface arrays.

Furthermore, a stabilizing device used for enabling the energy storage monomer to keep stable is arranged in the box body.

Furthermore, partition plates are arranged between the two installation surfaces of the box body at intervals, a plurality of installation grooves are formed in the box body, and a plurality of battery cell monomers form a monomer cluster and are installed in the installation grooves; a single lug is arranged on the single shell, and a first lug matching structure matched with the single lug is arranged on the side surface of the mounting groove in the length direction of the box body when the single lug is arranged on the side surface of the single shell; monomer utmost point ear sets up when on the monomer terminal surface, the mounting groove is located box width direction ascending both ends be equipped with monomer utmost point ear complex second utmost point ear cooperation structure.

The utility model has the beneficial effects that:

according to the current collector, the lug subareas are arranged on the long edges of the electrode areas, and the length of the long edges of the electrode areas is greater than that of the wide edges of the electrode areas, so that electrons can be conducted towards the lug subarea closest to the electrode areas in the current collector body, and the conducting distance of the electrons in the current collector body can be reduced; similarly, the length of the electrode area can be set according to different use scenes without limitation, and only the lug partitions are arranged on the long edge of the electrode area according to the set spacing distance; through reducing electron conduction distance, can reduce the resistance of electron conduction, reduce the inside heat that produces because of the resistance of electric core to can control electric core better and generate heat, improve electric core operational safety and stability.

Drawings

In order to make the object, technical scheme and beneficial effect of the utility model more clear, the utility model provides the following drawings for explanation:

fig. 1 is a schematic structural view of a current collector of example 1 of the present invention;

FIG. 2 is a schematic structural view of an electrode region having tab portions on two long sides thereof;

fig. 3 is a schematic structural diagram of a cell in embodiment 2 of the present invention;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

fig. 5 is a schematic structural view when the first tab and the second tab are located on the same side;

fig. 6 is a schematic structural diagram of a laminated cell in embodiment 3 of the present invention;

FIG. 7 is a cross-sectional view B-B of FIG. 6;

fig. 8 is a schematic structural diagram of a laminated cell in accordance with embodiment 4 of the present invention;

FIG. 9 is a cross-sectional view C-C of FIG. 8;

fig. 10 is a schematic structural diagram of a laminated cell in accordance with embodiment 5 of the present invention;

FIG. 11 is a left side view of FIG. 10;

FIG. 12 is a cross-sectional view D-D of FIG. 11;

fig. 13 is a schematic structural view when the first cell unit includes a plurality of cell devices;

fig. 14 is a schematic structural diagram of a laminated cell in accordance with embodiment 6 of the present invention;

FIG. 15 is a left side view of FIG. 14;

FIG. 16 is a cross-sectional view E-E of FIG. 15;

fig. 17 is a schematic structural diagram of a cell unit in example 7 of the present invention;

fig. 18 is a schematic view of a cell tab when disposed on a side of a cell;

fig. 19 is a schematic structural diagram of an energy storage device in accordance with embodiment 8 of the present invention;

FIG. 20 is a schematic structural view of the case with a middle positioning plate disposed therein;

FIG. 21 is a schematic view showing a structure in which a partition is provided in a case.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

Example 1

As shown in fig. 1, is a schematic structural diagram of a current collector embodiment 1 of the present invention. The current collector of the embodiment comprises a current collector body, wherein electricity is arranged on the current collector bodyA pole region 11 and a tab region 12, the pole region 11 being square and having a length L₀And width W₀And L is₀＞W_O. The tab region 12 of the present embodiment includes one or at least two tab partitions 13 arranged at intervals, and the side length of the tab partition 13 arranged on the electrode region 11 is L₀On the edge of (a).

Further, the tab partitions 13 are all arranged on one of the electrode regions 11, and the side length of one of the electrode regions is L₀As shown in fig. 1; or the lug subareas 13 are respectively arranged on two sides of the electrode area 11 with the length L₀As shown in fig. 2. And when the electrode lugs are arranged on the electrode area in a partitioning manner, the two side lengths of the electrode lugs are L₀The length of all tab sections 13 parallel to the electrode area is L₀Has a gap between the projections on the straight line of the sides. Preferably, all tab portions 13 have a length L parallel to the electrode area₀In the projection on the straight line of the side (b), the gaps between two adjacent projections are equal.

Further, in some embodiments, the length of the edge of the electrode region 11 may be W₀At least one tab partition 13 is arranged on the edge of the battery at intervals, and the description is not repeated.

In the current collector of the embodiment, the tab partition is arranged on the long edge of the electrode area, and the length of the long edge of the electrode area is greater than the length of the wide edge of the electrode area, so that electrons can be conducted towards the tab partition closest to the current collector in the current collector body, and the conduction distance of the electrons in the current collector body can be reduced; similarly, the length of the electrode area can be set according to different use scenes without limitation, and only the lug partitions are arranged on the long edge of the electrode area according to the set spacing distance; through reducing electron conduction distance, can reduce the resistance of electron conduction, reduce the inside heat that produces because of the resistance of electric core to can control electric core better and generate heat, improve electric core operational safety and stability.

Example 2

Fig. 3 is a schematic structural diagram of a cell in embodiment 2 of the present invention. The battery cell of the embodiment includes a first current collector 21 and a second current collector 22, where the first current collector 21 is provided with a first electrode material layer 23, and the second current collector 22 is provided with a second electrode material layer 24; a solid electrolyte layer (not shown in the figure) is disposed between the first electrode material layer 23 and the second electrode material layer 24, or a separator and an electrolyte (not shown in the figure) are disposed between the first electrode material layer 23 and the second electrode material layer 24, that is, the battery cell of the embodiment may be a solid battery cell or a liquid battery cell, which will not be described in detail.

The current collectors described in embodiment 1 are used for both the first current collector 21 and the second current collector 22 of this embodiment. The electrode area and the electrode lug area arranged on the first current collector 21 are respectively a first electrode area and a first electrode lug area; the electrode region and the polar ear region arranged on the second current collector 22 are a second electrode region and a second polar ear region respectively; a first electrode material layer 23 is disposed on the first electrode region, and a second electrode material layer 24 is disposed on the second electrode region; the tab section of the first tab region forms a first tab 25 and the tab section of the second tab region forms a second tab 26.

Further, in the direction perpendicular to the view direction of the first current collector 21, the electrode regions of the first current collector 21 and the second current collector 22 are overlapped, the first tab 25 and the second tab 26 are disposed on the same side of the electrode regions, and at this time, the first tab 25 and the second tab 26 are disposed in a staggered manner, as shown in fig. 5; or the first tab 25 and the second tab 26 are respectively disposed at both sides of the electrode region, as shown in fig. 3. The first tab 25 and the second tab 26 of the present embodiment are respectively disposed at both sides of the electrode region, so that the uniformity of the electrochemical reaction between the first electrode material layer 23 and the second electrode material layer 24 can be improved.

Example 3

Fig. 6 is a schematic structural diagram of a laminated cell in embodiment 3 of the present invention. The laminated cell of the embodiment includes at least two cells as described in embodiment 3, and the first current collectors 21 or the second current collectors 22 of two adjacent cells are laminated together; all the first current collectors 21 are correspondingly provided with one or at least two first tabs 25, and the correspondingly provided first tabs 25 are connected together, and the first current collectors 21 of the embodiment are correspondingly provided with three first tabs 25. All the second current collectors 22 are correspondingly provided with one or at least two second tabs 26, and the correspondingly provided second tabs 26 are connected together, and the second current collectors 22 of this embodiment are correspondingly provided with three second tabs 26. That is, in the laminated battery cell of the present embodiment, all the battery cells are connected in parallel.

Further, in a direction perpendicular to the view of the first current collector 21, all the first electrode regions and the second electrode regions coincide; the first electrode lugs 25 correspondingly arranged are partially or completely overlapped, and the second electrode lugs 26 correspondingly arranged are partially or completely overlapped, so that the first electrode lugs 25 correspondingly arranged on the first current collectors 21 can be conveniently connected together, and the second electrode lugs 26 correspondingly arranged on the second current collectors 22 can be conveniently connected together. In this embodiment, the first tabs 25 correspondingly disposed are welded together, and the second tabs 26 correspondingly disposed are welded together.

Further, in some embodiments, when the first electrode region and the second electrode region are simultaneously provided with the first tab 25 and the second tab 26 on the same side, a gap is provided between the first tab 25 and the second tab 26 provided on the side, preventing a short circuit between the first tab 25 and the second tab 26. Specifically, the first tab 25 and the second tab 26 disposed on the same side of the first electrode region and the second electrode region are alternately disposed.

Example 4

Fig. 8 is a schematic structural diagram of a laminated cell in embodiment 4 of the present invention. The laminated battery cell of the embodiment includes at least three first laminated current collectors arranged at intervals, and third electrode material layers 31 or fourth electrode material layers 32 are arranged on two side surfaces of each first laminated current collector; a third electrode material layer 31 and a fourth electrode material layer 32 are respectively arranged on the opposite side surfaces of two adjacent first laminated current collectors; a solid electrolyte layer (not shown) is provided between the third electrode material layer 31 and the fourth electrode material layer 32, or a separator and an electrolyte (not shown) are provided between the third electrode material layer 31 and the fourth electrode material layer 32. That is, the laminated cell in this embodiment may be a solid laminated cell, and may also be a liquid laminated cell.

All the first laminated current collectors used the current collector described in example 1. Let the first laminated current collector provided with the third electrode material layer 31 be the third current collector 33, and the first laminated current collector provided with the fourth electrode material layer 32 be the fourth current collector 34. The third electrode material layer 31 is disposed on the electrode region of the third current collector 33, and the fourth electrode material layer 32 is disposed on the electrode region of the fourth current collector 34; the tab partition of the third current collector 33 forms a third tab 35, and the tab partition of the fourth current collector 34 forms a fourth tab 36.

All the third current collectors 33 are correspondingly provided with one or at least two third tabs 35, and the correspondingly provided third tabs 35 are connected together, and the third current collectors 33 of the embodiment are correspondingly provided with two third tabs 35. All the fourth current collectors 34 are correspondingly provided with one or at least two fourth tabs 36, and the correspondingly provided fourth tabs 36 are connected together, and the fourth current collectors 34 of the embodiment are correspondingly provided with two fourth tabs 36. Specifically, in the present embodiment, the third lugs 35 and the fourth lugs 36 are welded together.

Further, in the direction perpendicular to the view of the third current collector 33, the electrode regions of all the third current collectors 33 and the fourth current collectors 34 coincide; correspond partial coincidence or complete coincidence between the third electrode ear 35 that sets up, correspond partial coincidence or complete coincidence between the fourth electrode ear 36 that sets up to can link together the first electrode ear 35 that corresponds the setting on each third current collector 33 conveniently, and in the same way, can link together the fourth electrode ear 36 that corresponds the setting on each fourth current collector 34 conveniently. In this embodiment, the third lugs 35 and the fourth lugs 36 are welded together.

Further, in some embodiments, when the third and

fourth electrode tabs

35 and 36 are disposed on the same side of the electrode zone, there is a gap between the third and

fourth electrode tabs

35 and 36, and the third and

fourth electrode tabs

35 and 36 disposed on the same side of the electrode zone are staggered.

Example 5

Fig. 10 is a schematic structural diagram of a laminated cell in embodiment 5 of the present invention. The laminated battery cell of the embodiment includes at least two first battery cell units 40 laminated together, and an insulating isolation layer 41 is disposed between two adjacent first battery cell units 40.

The first cell unit 40 includes at least one cell device, and the cell device includes a fifth current collector 42 and a sixth current collector 43, a fifth electrode material layer 44 is disposed on the fifth current collector 42, a sixth electrode material layer 45 is disposed on the sixth current collector 43, a solid electrolyte layer (not shown in the figure) is disposed between the fifth electrode material layer 44 and the sixth electrode material layer 45, or a separator and an electrolyte (not shown in the figure) are disposed between the fifth electrode material layer 44 and the sixth electrode material layer 45.

The current collectors described in example 1 were used for the fifth current collector and the sixth current collector. The fifth electrode material layer 44 is disposed on the electrode region of the fifth current collector 42, and the sixth electrode material layer 45 is disposed on the electrode region of the sixth current collector 43; the tab partition of the fifth current collector 42 forms a fifth tab 46 and the tab partition of the sixth current collector 43 forms a sixth tab 47.

The first cell unit 40 includes one cell device or at least two cell devices. When the first cell unit 40 includes at least two cell devices, the fifth current collectors 42 or the sixth current collectors 43 of two adjacent cell devices are stacked together. One or at least two fifth tabs 46 are correspondingly disposed on all the fifth current collectors 42 in the first cell unit 40, and the correspondingly disposed fifth tabs 46 are connected together, and three fifth tabs 46 are correspondingly disposed on the fifth current collectors 42 in this embodiment. One or at least two sixth tabs 47 are correspondingly disposed on all the sixth current collectors 43 in the first battery cell unit 40, and the correspondingly disposed sixth tabs 47 are connected together, and three sixth tabs 47 are correspondingly disposed on the sixth current collectors 43 in this embodiment. I.e., the cell devices belonging to the same first cell unit 40 are connected in parallel.

In two adjacent first cell units 40, the fifth tab 46 of one of the first cell units 40 and the sixth tab 47 of the other first cell unit 40 are connected together. I.e., the first cell units 40.

Further, in the direction of the view perpendicular to the fifth current collectors 42, the electrode regions of all the fifth current collectors 42 and the sixth current collectors 43 coincide; in the same first battery cell unit 40, the correspondingly arranged fifth tabs 46 are partially or completely overlapped, and the correspondingly arranged sixth tabs 47 are partially or completely overlapped. Therefore, the fifth tabs 46 correspondingly disposed on the fifth current collectors 42 can be conveniently connected together, and similarly, the sixth tabs 47 correspondingly disposed on the sixth current collectors 43 can be conveniently connected together. In this embodiment, the correspondingly arranged fifth tabs 46 are welded together, and the correspondingly arranged sixth tabs 47 are welded together.

Further, in some embodiments, when the fifth tab 46 and the sixth tab 47 are disposed on the same side of the electrode region in the same first cell unit 40, a gap is formed between the fifth tab 46 and the sixth tab 47, so as to prevent a short circuit between the fifth tab 46 and the sixth tab 47. And the fifth lug and the sixth lug which are arranged on the same side of the electrode area are arranged in a staggered manner.

Further, in two adjacent first cell units 40, the fifth tab 46 of one of the first cell units 40 and the sixth tab 47 of the other first cell unit 40 are welded and connected. In two adjacent first cell units 40 of the present embodiment, the fifth tab 46 of one of the first cell units 40 is arranged corresponding to the sixth tab 47 of the other first cell unit 40; in the view direction perpendicular to the fifth current collector 42, the fifth tabs 46 and the sixth tabs 47 correspondingly disposed in two adjacent first cell units 40 partially or completely overlap with each other, so that the welding connection is facilitated, and the series connection between the first cell units 40 is realized.

Example 6

Fig. 14 is a schematic structural diagram of a laminated cell in embodiment 6 of the present invention. The laminated battery cell of the embodiment includes at least two second battery cell units 50 laminated together, and an insulating isolation layer 51 is disposed between two adjacent second battery cell units 50.

The second battery cell unit 50 comprises at least three second laminated current collectors arranged at intervals, and seventh electrode material layers 52 or eighth electrode material layers 53 are arranged on two side surfaces of each second laminated current collector; a seventh electrode material layer 52 and an eighth electrode material layer 53 are respectively arranged on the opposite side surfaces of two adjacent second laminated current collectors; a solid electrolyte layer (not shown) is provided between the seventh electrode material layer 52 and the eighth electrode material layer 53, or a separator and an electrolyte (not shown) are provided between the seventh electrode material layer 52 and the eighth electrode material layer 53.

All of the second laminated current collectors used the current collector described in example 1. Let the second laminated current collector provided with the seventh electrode material layer 52 be a seventh current collector 54, and the second laminated current collector provided with the eighth electrode material layer 53 be an eighth current collector 55. The seventh electrode material layer 52 is disposed on the electrode region of the seventh current collector 54, and the eighth electrode material layer 53 is disposed on the electrode region of the eighth current collector 55; the tab partition of the seventh current collector 54 forms a seventh tab 56, and the tab partition of the eighth current collector 55 forms an eighth tab 57.

One or at least two seventh tabs 56 are correspondingly disposed on all the seventh current collectors 54 in the second battery cell unit 50, and the correspondingly disposed seventh tabs 56 are connected together, and two seventh tabs 56 are correspondingly disposed on the seventh current collectors 54 in this embodiment. One or at least two eighth tabs 57 are correspondingly arranged on all the eighth current collectors 55 in the second cell unit, the correspondingly arranged eighth tabs 57 are connected together, and two eighth tabs 57 are correspondingly arranged on the eighth current collectors 55 in this embodiment. In two adjacent second cell units 50, the seventh tab 56 of one of the second cell units 50 and the eighth tab 57 of the other second cell unit 50 are connected together.

Further, in the direction of the view perpendicular to the seventh current collectors 54, the electrode regions of all the seventh current collectors 54 and the eighth current collectors 55 coincide; in the same second battery cell unit 50, the correspondingly arranged seventh tabs 56 are partially or completely overlapped, and the correspondingly arranged eighth tabs 57 are partially or completely overlapped. Therefore, the seventh tabs 56 correspondingly disposed on the seventh current collectors 54 can be conveniently connected together, and similarly, the eighth tabs 57 correspondingly disposed on the eighth current collectors 55 can be conveniently connected together. In this embodiment, the seventh tabs 56 are welded to each other, and the eighth tabs 57 are welded to each other. That is, the second cell unit 50 of the present embodiment is connected in parallel.

Further, in the same second cell unit 40, when the seventh tab 56 and the eighth tab 57 are simultaneously disposed on the same side of the electrode region, a gap is formed between the seventh tab 56 and the eighth tab 57, so as to prevent short circuit between the seventh tab 56 and the eighth tab 57, and at this time, the seventh tab and the eighth tab disposed on the same side of the electrode region may be disposed in a staggered manner.

Further, in two adjacent second cell units 50, the seventh tab 56 of one of the second cell units 50 and the eighth tab 57 of the other second cell unit 50 are welded and connected. In two adjacent second cell units 50, the seventh tab 56 of one of the second cell units 50 is arranged corresponding to the eighth tab 57 of the other second cell unit 50; in the view direction perpendicular to the seventh current collector, the seventh tab 56 and the eighth tab 57 correspondingly disposed in two adjacent second cell units 50 are partially or completely overlapped, so that the seventh tab 56 and the eighth tab 57 of two adjacent second cell units 50 are conveniently connected together, i.e., the two adjacent second cell units 50 are connected in series.

Example 7

Fig. 17 is a schematic structural diagram of a cell unit in example 7 of the present invention. The battery cell unit of the present embodiment includes a cell casing 60, and a laminated battery cell 61 is disposed in the cell casing 60, where the laminated battery cell 61 may be the laminated battery cell described in embodiment 3, embodiment 4, embodiment 5, or embodiment 6.

Further, the single body case 60 is rectangular and has long sides, wide sides and thick sides, the long sides of the single body case 60 are parallel to the long sides of the electrode regions, and the wide sides of the single body case 60 are parallel to the wide sides of the electrode regions; the side surface having the long side and the thick side of the single body case 60 is the single body side surface 62. The laminated cell of this embodiment is a liquid laminated cell with a separator 69 and electrolyte between the electrode materials. The side surface of the single body is provided with a liquid injection port 63 for injecting electrolyte. Specifically, the cell casing 60 has two cell side surfaces 62, and the two cell side surfaces of the cell casing of this embodiment are respectively provided with the liquid injection port 63, so that the width of the laminated battery cell 61 can be made wider and the requirement of liquid injection can be met. Specifically, when the length of the laminated battery core 61 is long, at least two liquid injection ports 63 may be respectively disposed on the cell side surfaces 62 at intervals, and the number of the liquid injection ports 63 disposed on each cell side surface 62 is set according to the actual liquid injection requirement, which is not described in detail. The single body housing 60 of this embodiment is also provided with an explosion-proof valve 68.

Further, the side surfaces with the side length being the wide edge and the thick edge of the monomer shell are monomer end surfaces 67, monomer tabs are arranged on the monomer shell 60, and the monomer tabs are arranged on the monomer side surfaces 62 and/or the monomer end surfaces 67. Specifically, the cell tabs include a first cell tab 65 and a second cell tab 66, and the first cell tab 65 and the second cell tab 66 may be disposed on the same cell side surface 62 or the cell end surface 67. As shown in fig. 18, a first cell tab 65 and a second cell tab 66 are provided on the two cell side surfaces 62, respectively; as shown in fig. 17, a first cell tab 65 and a second cell tab 66 are provided on the two cell end surfaces 67, respectively. Specifically, when the first cell tab 65 and the second cell tab 66 are disposed on the cell side surface 62, at least one first cell tab 65 or one second cell tab 66 is disposed on the cell side surface 62 at intervals, and the number of the first cell tabs 65 and the number of the second cell tabs 66 are set according to the length of the laminated battery cell 61, so as to reduce the resistance of the electronic conduction to below a set threshold value.

When the laminated battery cell 61 of the present embodiment is the laminated battery cell described in embodiment 3, the first cell tabs 65 and the first tabs 25 are disposed in a one-to-one correspondence, the second cell tabs 66 and the second tabs 26 are disposed in a one-to-one correspondence, and the first cell tabs 65 and the second cell tabs 66 are disposed on the side surfaces of the cells.

When the laminated battery cell 61 of the present embodiment is the laminated battery cell described in embodiment 4, the first cell tabs 65 and the third cell tabs 35 may be disposed in a one-to-one correspondence, the second cell tabs 66 may be disposed in a one-to-one correspondence with the fourth cell tabs 36, and the first cell tabs 65 and the second cell tabs 66 may be disposed on the cell side surfaces.

When the laminated battery cell 61 of the present embodiment is the laminated battery cell described in embodiment 5, the first cell tab 65 and the fifth cell tab 46 may be disposed in a one-to-one correspondence manner, the second cell tab 66 and the sixth cell tab 47 may be disposed in a one-to-one correspondence manner, and the first cell tab 65 and the second cell tab 66 are disposed on the cell side surface.

When the laminated battery cell 61 of the present embodiment is the laminated battery cell as described in embodiment 6, the first cell tab 65 and the seventh cell tab 56 may be disposed in a one-to-one correspondence manner, the second cell tab 66 and the eighth cell tab 57 may be disposed in a one-to-one correspondence manner, and the first cell tab 65 and the second cell tab 66 are disposed on the cell side surface.

Example 8

Fig. 19 is a schematic structural diagram of an energy storage device in accordance with embodiment 8 of the present invention. The energy storage device of this embodiment includes a case 70, and at least one battery cell unit 71 as described in embodiment 7 is disposed in the case 70.

Further, the case 70 has a rectangular parallelepiped shape, and has a length L, a width W, and a height H; the cell unit 71 is rectangular, and has a length L ', a width W ', and a thickness T '; if two side surfaces of the box 70 with a length of L and a height of H are mounting surfaces, the width W of the box 70 and the length L' of the cell unit 71 satisfy:

L＝L’+δ₁or L ═ 2L' + δ₂

That is, the length of the cell unit 71 is about the width of the casing 70 or about half of the width of the casing 70. Specifically, as shown in fig. 19, when the length of the battery cell 71 is about the width of the box 70, one of the two installation surfaces of the box 70 is an openable operation surface, the other installation surface is a positioning surface, a single cell insertion structure for inserting the battery cell is arranged on the positioning surface, and the battery cell is inserted into the single cell insertion structure through the operation surface array. As shown in fig. 20, when the length of the battery cell unit 71 is approximately equal to half of the width of the box 70, a middle positioning plate 72 parallel to the installation surface is arranged in the box 70, both side surfaces of the middle positioning plate 72 are positioning surfaces, a single unit plugging structure for plugging the battery cell unit is arranged on the positioning surfaces, both installation surfaces of the box 70 are openable operation surfaces, and the battery cell unit is plugged and installed on the single plugging structure through two operation surface arrays. In the energy storage device of this embodiment, can realize the grafting installation of electric core monomer 71 through operation face and locating surface, it is more convenient not only to install, can directly overhaul each electric core monomer 71 outside the box moreover and maintain, different in the inside affiliated facilities who sets up the access way of box 70 again, can effectively improve the space utilization in the box 70, improve energy storage capacity. Preferably, a stabilizing device 73 for stabilizing the cell units is arranged in the box body 70.

As shown in fig. 21, the structure inside the case 70 may be: partition plates 75 are arranged between the two installation surfaces of the box body 70 at intervals, a plurality of installation grooves are formed in the box body 70, and a plurality of battery cell monomers 71 form a monomer cluster 74 and are installed in the installation grooves; a single lug is arranged on the single shell 60, and when the single lug is arranged on the side surface 62 of the single shell, a first lug matching structure matched with the single lug is arranged on the side surface of the mounting groove in the length direction of the box body; when the single tab is arranged on the single end face 67, the two ends of the mounting groove in the width direction of the box body 70 are provided with second tab matching structures matched with the single tabs.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the utility model is all within the protection scope of the utility model. The protection scope of the utility model is subject to the claims.

Claims

1. A current collector, characterized by: the current collector comprises a current collector body, wherein an electrode area and a tab area are arranged on the current collector body, and the electrode area is square and has a long L shape₀And width W₀And L is₀＞W_O；

2. The current collector of claim 1, wherein: the electrode lugs are all arranged in the electrode area in a partition mode, wherein one side length of one electrode lug is L₀The edge of (a); or the lugs are respectively arranged on the two side lengths of the electrode area in a partitioning manner and have the length of L₀On the edge of (a).

3. The current collector of claim 2, wherein: when the lug is arranged on the electrode area in a partitioning manner, the two side lengths of the lug are L₀When the side of the electrode is divided into two parts, the length of the side of all the lug subareas parallel to the electrode area is L₀Has a gap between the projections on the straight line of the sides.

4. The current collector of claim 1, wherein: the side length of the electrode area is W₀The edge of the battery is provided with at least one lug partition at intervals.

5. An electric core, its characterized in that: the current collector comprises a first current collector and a second current collector, wherein a first electrode material layer is arranged on the first current collector, and a second electrode material layer is arranged on the second current collector; a solid electrolyte layer is arranged between the first electrode material layer and the second electrode material layer, or a diaphragm and electrolyte are arranged between the first electrode material layer and the second electrode material layer;

the current collectors as in any one of claims 1-4 are adopted for the first current collector and the second current collector; enabling an electrode area and an electrode lug area arranged on the first current collector to be a first electrode area and a first electrode lug area respectively; the electrode area and the polar ear area which are arranged on the second current collector are respectively a second electrode area and a second polar ear area; the first electrode material layer is arranged on the first electrode region, and the second electrode material layer is arranged on the second electrode region; the first pole ear area is formed into a first pole ear in a pole ear partition mode, and the second pole ear area is formed into a second pole ear in a pole ear partition mode.

6. The cell of claim 5, wherein: in a view direction perpendicular to the first current collector, electrode regions of the first current collector and the second current collector are overlapped, the first electrode lug and the second electrode lug are arranged on the same side of the electrode regions, or the first electrode lug and the second electrode lug are respectively arranged on two sides of the electrode regions.

7. A laminated cell, comprising: comprising at least two cells of claim 5 or 6, the first or second current collectors of two adjacent cells being stacked together; one or at least two first tabs are correspondingly arranged on all the first current collectors, and the correspondingly arranged first tabs are connected together; all the second current collectors are correspondingly provided with one or at least two second pole lugs, and the correspondingly arranged second pole lugs are connected together.

8. The laminated cell of claim 7, wherein: in a view direction perpendicular to the first current collector, all the first electrode regions and the second electrode regions are overlapped; the first pole lugs which are correspondingly arranged are partially or completely overlapped, and the second pole lugs which are correspondingly arranged are partially or completely overlapped.

9. The laminated cell of claim 8, wherein: when the same side of the first electrode region and the second electrode region is simultaneously provided with the first lug and the second lug, a gap is formed between the first lug and the second lug which are arranged on the same side.

10. The laminated cell of claim 9, wherein: the first electrode regions and the second electrode regions are arranged on the same side of the first electrode regions and the second electrode regions in a staggered mode.

11. The laminated cell of claim 7, wherein: the first pole lugs are correspondingly connected in a welding mode, and the second pole lugs are correspondingly connected in a welding mode.

12. A laminated cell, comprising: the current collector comprises at least three first laminated current collectors arranged at intervals, wherein third electrode material layers or fourth electrode material layers are arranged on the side surfaces of two sides of each first laminated current collector; the third electrode material layer and the fourth electrode material layer are respectively arranged on the opposite side surfaces of the two adjacent first laminated current collectors; a solid electrolyte layer is arranged between the third electrode material layer and the fourth electrode material layer, or a diaphragm and electrolyte are arranged between the third electrode material layer and the fourth electrode material layer;

all of said first laminated current collectors employ a current collector as claimed in any one of claims 1 to 4; the first laminated current collector provided with the third electrode material layer is a third current collector, and the first laminated current collector provided with the fourth electrode material layer is a fourth current collector;

13. The laminated cell of claim 12, wherein: in a view direction perpendicular to the third current collector, the electrode regions of all the third current collector and the fourth current collector are overlapped; the third pole ears which are correspondingly arranged are partially or completely overlapped, and the fourth pole ears which are correspondingly arranged are partially or completely overlapped.

14. The laminated cell of claim 13, wherein: when the same side of the electrode area is simultaneously provided with the third tab and the fourth tab, a gap is formed between the third tab and the fourth tab.

15. The laminated cell of claim 14, wherein: the third electrode lugs and the fourth electrode lugs are arranged on the same side of the electrode area in a staggered mode.

16. The laminated cell of claim 12, wherein: the third lugs are correspondingly connected in a welding mode, and the fourth lugs are correspondingly connected in a welding mode.

17. A laminated cell, comprising: the battery comprises at least two first battery cell units which are laminated together, wherein an insulating isolation layer is arranged between every two adjacent first battery cell units;

the current collectors as claimed in any one of claims 1 to 4 are adopted for the fifth current collector and the sixth current collector; the fifth electrode material layer is arranged on the electrode region of the fifth current collector, and the sixth electrode material layer is arranged on the electrode region of the sixth current collector; the lug partition of the fifth current collector forms a fifth lug, and the lug partition of the sixth current collector forms a sixth lug;

18. The laminated cell of claim 17, wherein: in a view direction perpendicular to the fifth current collector, the electrode regions of all the fifth current collector and the sixth current collector are overlapped; in the same first cell unit, the correspondingly arranged fifth tabs are partially or completely overlapped, and the correspondingly arranged sixth tabs are partially or completely overlapped.

19. The laminated cell of claim 18, wherein: in the same first cell unit, when the fifth tab and the sixth tab are arranged on the same side of the electrode region, a gap is formed between the fifth tab and the sixth tab.

20. The laminated cell of claim 19, wherein: the fifth pole lug and the sixth pole lug which are arranged on the same side of the electrode area are arranged in a staggered mode.

21. The laminated cell of claim 17, wherein: all the fifth tabs in the first battery cell unit are connected in a welding mode; all the sixth pole lugs in the first battery cell unit are connected in a welding mode; in two adjacent first cell units, the fifth tab of one of the first cell units is welded to the sixth tab of the other first cell unit.

22. The laminated cell of claim 17, wherein: in two adjacent first cell units, a fifth tab of one of the first cell units is arranged corresponding to a sixth tab of the other first cell unit; in a view direction perpendicular to the fifth current collector, a fifth tab and a sixth tab, which are correspondingly disposed in two adjacent first cell units, are partially or completely overlapped.

23. A laminated cell, comprising: the battery comprises at least two second battery cell units which are laminated together, wherein an insulating isolation layer is arranged between every two adjacent second battery cell units;

all of said second laminated current collectors using a current collector according to any one of claims 1 to 4; the second laminated current collector provided with the seventh electrode material layer is a seventh current collector, and the second laminated current collector provided with the eighth electrode material layer is an eighth current collector; the seventh electrode material layer is arranged on the electrode region of the seventh current collector, and the eighth electrode material layer is arranged on the electrode region of the eighth current collector; the lug of the seventh current collector is partitioned to form a seventh lug, and the lug of the eighth current collector is partitioned to form an eighth lug;

24. The laminated cell of claim 23, wherein: in a view direction perpendicular to the seventh current collector, the electrode regions of all the seventh and eighth current collectors are overlapped; in the same second cell unit, the seventh tabs correspondingly arranged are partially or completely overlapped, and the eighth tabs correspondingly arranged are partially or completely overlapped.

25. The laminated cell of claim 24, wherein: in the same second cell unit, when the seventh tab and the eighth tab are arranged on the same side of the electrode region, a gap is formed between the seventh tab and the eighth tab.

26. The laminated cell of claim 25, wherein: the seventh pole lug and the eighth pole lug which are arranged on the same side of the electrode area are arranged in a staggered mode.

27. The laminated cell of claim 23, wherein: all the seventh tabs in the second cell unit are connected in a welding mode; all the eighth pole lugs in the second battery cell unit are connected in a welding mode; in two adjacent second cell units, the seventh tab of one of the second cell units is welded to the eighth tab of the other second cell unit.

28. The laminated cell of claim 23, wherein: in two adjacent second cell units, a seventh tab of one of the second cell units is arranged corresponding to an eighth tab of the other second cell unit; in a view direction perpendicular to the seventh current collector, a seventh tab and an eighth tab correspondingly arranged in two adjacent second battery cell units partially or completely overlap.

29. A battery cell monomer is characterized in that: comprising a cell casing within which is disposed a laminated cell according to any of claims 7 to 28.

30. The cell monomer of claim 29, wherein: the single body shell is rectangular and is provided with a long edge, a wide edge and a thick edge, the long edge of the single body shell is parallel to the long edge of the electrode area, and the wide edge of the single body shell is parallel to the wide edge of the electrode area; the side surfaces with the side length being the long side and the thick side of the monomer shell are monomer side surfaces, the monomer side surfaces are provided with liquid injection ports for injecting electrolyte, and the pole ear regions are provided with through holes for circulating the electrolyte.

31. The cell monomer of claim 30, wherein: and the two monomer side surfaces of the monomer shell are respectively provided with the liquid injection port.

32. The cell monomer of claim 31, wherein: at least two liquid injection ports are respectively arranged on the side surfaces of the single bodies at intervals.

33. The cell monomer of claim 29, wherein: the side surfaces with the side length of the wide edge and the thick edge of the monomer shell are monomer end surfaces, monomer lugs are arranged on the monomer shell, and the monomer lugs are arranged on the monomer side surfaces and/or the monomer end surfaces.

34. The cell monomer of claim 33, wherein: the single pole lug comprises a first single pole lug and a second single pole lug, wherein the first single pole lug and the second single pole lug are respectively arranged on the side surface of the single pole, or the first single pole lug and the second single pole lug are respectively arranged on the end surface of the single pole.

35. The cell monomer of claim 34, wherein: and at least one first monomer lug or second monomer lug is arranged on the side surface of each monomer at intervals.

36. An energy storage device, characterized by: comprising a case in which at least one cell unit according to any one of claims 29 to 35 is disposed.

37. The energy storage device of claim 36, wherein: the box body is cuboid and has a length L, a width W and a height H; the single body is cuboid and has a length L ', a width W ' and a thickness T '; two side surfaces with the length of length L and the height H in the box body are taken as installation surfaces, and the width W of the box body and the length L' of the single body meet the following requirements:

L＝L’+δ₁or L ═ 2L' + δ₂

38. The energy storage device of claim 37, wherein: one of the two installation surfaces of the box body is an openable operation surface, the other installation surface is a positioning surface, a single body inserting structure for inserting the energy storage single body is arranged on the positioning surface, and the energy storage single body is inserted in the single body inserting structure through the operation surface array; or the like, or, alternatively,

39. The energy storage device of claim 38, wherein: and a stabilizing device used for keeping the energy storage monomer stable is arranged in the box body.

40. The energy storage device of claim 37, wherein: partition plates are arranged between the two installation surfaces of the box body at intervals, a plurality of installation grooves are formed in the box body, and a plurality of battery cell monomers form a monomer cluster and are installed in the installation grooves; a single lug is arranged on the single shell, and a first lug matching structure matched with the single lug is arranged on the side surface of the mounting groove in the length direction of the box body when the single lug is arranged on the side surface of the single shell; monomer utmost point ear sets up when on the monomer terminal surface, the mounting groove is located box width direction ascending both ends be equipped with monomer utmost point ear complex second utmost point ear cooperation structure.