CN220797025U - Pole-free battery cell and battery cell module - Google Patents

Abstract

The utility model discloses a battery cell without a pole and a battery cell module, belonging to the technical field of power battery cells; the battery cell comprises a battery cell body, a battery cell and a battery cell, wherein the battery cell body is of a hexahedral structure and comprises a positive electrode part and a negative electrode part, the positive electrode part comprises at least one first positive electrode surface positioned on the front surface or the back surface of the hexahedral structure and N second positive electrode surfaces adjacent to the first positive electrode surface; the negative electrode part is connected with the positive electrode part, and comprises a negative electrode surface except the positive electrode part; the positive electrode part also comprises an exhaust valve which is arranged on one side surface of the hexahedral structure adjacent to the first positive electrode surface; wherein N is a natural number of 0 or more and 4 or less. The beneficial effects of the technical scheme are as follows: the structure of the battery core is simplified, and the manufacturing difficulty of the battery core is reduced; the overcurrent area is large enough, the heat generation is small in working, the soaking can be carried out, and the safety is higher; the pole pieces are not needed during grouping, welding is not needed, the safety is high, the maintainability is realized, and the material management is convenient; is beneficial to light weight and cost control.

Description

Pole-free battery cell and battery cell module

Technical Field

The utility model relates to the field of power cells, in particular to a non-pole cell and a cell module.

Background

At present, a power battery cell generally has a positive pole post and a negative pole post structure, and the circuit connection of the battery cell is realized by welding pole pieces on the positive pole post and the negative pole post, so that the design needs a plurality of pole piece parts and welding operation; the battery cells are designed side by side, gaps are reserved among the battery cells, a certain height is reserved between the pole posts and the pole pieces after the welding, and the pole pieces cover the upper surfaces of the battery cells, so that the temperature sensor is generally arranged on the pole pieces; the exhaust valve and the pole are also positioned on the same surface, and short circuit is easy to be caused when the heat is out of control, so that the heat diffusion is further increased.

In the prior art, the structure of the battery cell is complex, and the manufacturing difficulty is high; the electrode plates are welded on the electrode posts of the battery cell protrusions to carry out circuit connection, so that the problem of cold joint easily occurs, and the welding quality and the later use are affected; the pole pieces are too many, so that the difficulty of material management is increased; the grouped battery cells have no maintainability and high cost.

Disclosure of Invention

The utility model aims to provide a pole-free battery cell, which solves the technical problems;

the utility model also aims to provide a pole-free cell module which solves the technical problems;

a battery cell without a pole comprises,

the battery cell comprises a battery cell body, wherein the battery cell body is of a hexahedral structure and comprises a positive electrode part and a negative electrode part, and the positive electrode part comprises at least one first positive electrode surface positioned on the front surface or the back surface of the hexahedral structure and N second positive electrode surfaces adjacent to the first positive electrode surface;

the negative electrode part is connected with the positive electrode part, and comprises a negative electrode surface of the hexahedral structure except the positive electrode part;

the positive electrode part further comprises an exhaust valve, and the exhaust valve is arranged on one side surface of the hexahedral structure adjacent to the first positive electrode surface;

wherein N is a natural number of 0 or more and 4 or less.

Preferably, the side surface on which the exhaust valve is located is the second positive surface or the negative surface.

A cell module without polar column comprises,

the first battery cell module comprises M battery cell bodies with first positive electrodes arranged facing a first direction;

the second cell module is arranged in parallel with the first cell module, and comprises M cell bodies with the first positive electrodes arranged in a second direction opposite to the first direction;

the first connecting piece and the second connecting piece are arranged at one ends of the first battery cell module and the second battery cell module;

and the third connecting sheet is arranged at the other ends of the first battery cell module and the second battery cell module, and M is an integer larger than 1.

Preferably, the first connecting piece is connected with a first module tail cell in the first cell module, and the second connecting piece is connected with a second module head cell in the second cell module;

the third connecting piece is connected with a first module head cell in the first cell module and a second module tail cell in the second cell module.

Preferably, the method further comprises the steps of,

the third battery cell module comprises M battery cell bodies with the first positive electrodes facing the first direction;

the fourth cell module is arranged in parallel with the third cell module, and comprises M cell bodies with the first positive electrodes facing the first direction;

the fourth connecting piece and the fifth connecting piece are respectively arranged at two ends of the third electric core module and the fourth electric core module and are connected with the third electric core module and the fourth electric core module, and M is an integer larger than 1.

Preferably, the fourth connecting piece is connected with a third module head cell in the third cell module and a fourth module head cell in the fourth cell module;

and the fifth connecting sheet is connected with the third module tail battery cell in the third battery cell module and the fourth module tail battery cell in the fourth battery cell module.

Preferably, a conductive paste is coated on a contact surface between two adjacent cell bodies in the first cell module and the second cell module;

and the contact surface between two adjacent cell bodies in the third cell module and the fourth cell module is coated with the conductive paste.

Preferably, end plates for locking the plurality of battery cell bodies are arranged at two ends and two sides of the first battery cell module and the second battery cell module;

the end plates for locking the plurality of battery cell bodies are arranged at the two ends and the two sides of the third battery cell module and the fourth battery cell module.

Preferably, a liquid cooling plate for heating and cooling is arranged below the first electric core module and the second electric core module.

Preferably, a liquid cooling plate for heating and cooling is arranged below the third cell module and the fourth cell module.

The utility model has the beneficial effects that: the structure of the battery core is simplified, and the manufacturing difficulty of the battery core is reduced; the overcurrent area is large enough, the heat generation is small in working, the soaking can be carried out, and the safety is higher; the pole pieces are not needed during grouping, welding is not needed, the safety is high, the maintainability is realized, and the material management is convenient; is beneficial to light weight and cost control.

Drawings

FIG. 1 is a schematic diagram of a non-pole cell of the present utility model;

FIG. 2 is a schematic diagram of a series cell module of the present utility model;

fig. 3 is a schematic diagram of a parallel cell module of the present utility model.

In the accompanying drawings: 1. a cell body; 2. a first positive face; 3. a negative face; 4. an exhaust valve; 5. a first cell module; 51. a first module header cell; 52. a first module tail cell; 6. a second cell module; 61. a second module header cell; 62. a second module tail cell; 7. a first connecting piece; 8. a second connecting piece; 9. a third connecting piece; 10. a conductive paste; 11. a liquid cooling plate; 12. a third cell module; 121. a third module header cell; 122. a third module tail cell; 13. a fourth cell module; 131. a fourth module header cell; 132. a fourth module tail cell; 14. a fourth connecting piece; 15. and a fifth connecting piece.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The utility model is further described below with reference to the drawings and specific examples, which are not intended to be limiting.

A non-terminal cell module, as shown in figures 1-3, comprising,

the battery cell comprises a battery cell body 1, wherein the battery cell body 1 is of a hexahedral structure, the battery cell body 1 comprises an anode part and a cathode part, and the anode part comprises at least one first anode surface 2 positioned on the front surface or the back surface of the hexahedral structure and N second anode surfaces adjacent to the first anode surface 2;

the negative electrode part is connected with the positive electrode part, and comprises a hexahedral negative electrode surface 3 except the positive electrode part;

the positive electrode part also comprises an exhaust valve 4, and the exhaust valve 4 is arranged on one side surface of the hexahedral structure adjacent to the first positive electrode surface 2;

wherein N is a natural number of 0 or more and 4 or less.

Specifically, the utility model provides a non-polar column battery cell, which is mainly applied to the field of power battery cells, wherein a battery cell body 1 is hexahedral, and a positive electrode part and a negative electrode part of the battery cell can be combined as required; the positive and negative poles of the battery cell are a complete large surface, no other protruding structures are needed, welding is not needed, the placing direction is free, the large surface of the battery cell is used as a current channel, the overcurrent capacity is high, the heat productivity and the temperature difference between the battery cells are reduced, and when the battery cell expands, the battery cell is in contact with the battery cell more tightly and safely, the material types and the management difficulty are reduced, the maintainability is realized, and the operation safety is greatly improved.

Further specifically, the positive electrode and the negative electrode of the battery cell are a complete large surface, so that the structure of the battery cell is simplified, and the manufacturing difficulty of the battery cell is reduced; the overcurrent area is large enough, the heat generation during working is small, the soaking can be performed, and the safety is higher; the pole pieces are not needed when the pole pieces are grouped, so that the pole pieces are maintainable and convenient for material management; is beneficial to light weight and cost control.

In a preferred embodiment, the exhaust valve is located on the side of the second positive or negative electrode surface.

Specifically, the electric cores are connected side by side, welding operation is not needed, the exhaust valve 4 and the positive electrode and the negative electrode are not arranged on one surface, and the electric cores are conveniently grouped; the arrangement of the FPC is facilitated, and meanwhile, the temperature sensor can be more conveniently and directly arranged on the battery cell, so that the temperature measurement is more accurate.

A cell module without polar column comprises,

a first cell module 5 including M cell bodies 1 having first positive electrode faces 2 arranged in a first direction;

a second cell module 6 disposed in parallel with the first cell module 5, the second cell module 6 including M cell bodies 1 having first positive electrode faces 2 disposed in a second direction opposite to the first direction;

the first connecting sheet 7 and the second connecting sheet 8 are arranged at one ends of the first cell module 5 and the second cell module 6;

and the third connecting sheet 9 is arranged at the other ends of the first cell module 5 and the second cell module 6, and M is an integer larger than 1.

The utility model provides a battery core module without a polar column, which is mainly applied to the field of power battery cores, wherein the battery core modules are arranged in parallel, two battery cores at two ends of the module can be welded through connecting sheets in advance, and the battery cores are arranged at designed positions during assembly, so that the welding process is omitted, the use safety is improved, the energy density of a battery is increased, and the production efficiency of the module is greatly improved.

In a preferred embodiment, the first connecting piece 7 is connected to the first module tail cell 52 in the first cell module 5, and the second connecting piece 8 is connected to the second module head cell 61 in the second cell module 6;

the third connecting piece 9 connects the first module head cell 51 in the first cell module 5 and the second module tail cell 62 in the second cell module 6.

Specifically, in the same module, the battery cores are sequentially arranged according to the same direction, adjacent modules are arranged according to opposite directions, the positive electrodes and the negative electrodes of the two modules are arranged on one side, and the two modules can be connected by welding the connecting sheets together.

Further specifically, during actual assembly, two electric cores at two ends of the module can be welded through connecting sheets in advance, and the two electric cores are placed at designed positions during assembly, so that the whole welding process of the module can be omitted, the two electric cores can be welded, the fixture is quite simple, the sample is light and convenient, easy to manage, the operation is more convenient and safer, and the welding quality is easier to ensure; if welding problems occur, only two cells are scrapped, so that the cost control is facilitated, and the maintenance is easy.

In a preferred embodiment, the method further comprises,

the third cell module 12 comprises M cell bodies 1 with first positive electrode faces 2 arranged towards a first direction;

a fourth cell module 13, disposed in parallel with the third cell module 12, the fourth cell module 13 including M cell bodies 1 having first positive electrode faces 2 facing in a first direction;

the fourth connecting piece 14 and the fifth connecting piece 15 are respectively arranged at two ends of the third cell module 12 and the fourth cell module 13 and are used for connecting the third cell module 12 and the fourth cell module 13, and M is an integer larger than 1.

Specifically, if a plurality of electric cores are required to be designed in parallel, only two electric core clusters with the same orientation are required to be locked together, then two electric cores at the extreme ends of the electric core clusters are welded together through connecting sheets, and the operation is simple and safe.

In a preferred embodiment, the fourth connecting piece 14 connects the third module header cell 121 in the third cell module 12 and the fourth module header cell 131 in the fourth cell module 13;

the fifth connecting piece 15 connects the third module tail cell 122 in the third cell module 12 and the fourth module tail cell 132 in the fourth cell module 13.

Specifically, the third cell module 12 and the fourth cell module 13 pass through two cells at the extreme ends, and the fourth connecting piece 14 and the fifth connecting piece 15 are welded together through the connecting pieces, so that the operation is simple and the safety is ensured.

In a preferred embodiment, the contact surface between two adjacent cell bodies 1 in the first cell module 5 and the second cell module 6 is coated with a conductive paste 10;

the contact surface between two adjacent cell bodies 1 in the third cell module 12 and the fourth cell module 13 is coated with conductive paste 10.

Specifically, when the electric cores are arranged, a layer of conductive paste 10 is brushed on the contact surface of the two electric cores, after the arrangement, the electric core clusters can be locked through the end plates at the two ends of the module, the reliable electric connection between the electric cores can be ensured after the locking due to the large-surface connection, the overcurrent area is large enough, and the problem of local overheating caused by insufficient overcurrent area can be avoided; because of large-surface contact, the heat transfer performance among the battery cells is strong, which is favorable for reducing the temperature difference among the battery cells, and further, the consistency of the electrical performance of the battery cells can be maintained to a high degree.

In a preferred embodiment, two ends and two sides of the first cell module 5 and the second cell module 6 are provided with end plates for locking the plurality of cell bodies 1;

both ends and both sides of the third cell module 12 and the fourth cell module 13 are provided with end plates for locking the plurality of cell bodies 1.

Specifically, the both ends and the both sides of module are equipped with the end plate that locks a plurality of electric cores, and the end plate of locking plays fixed, protection and sealed effect in electric core module, ensures the normal operating and the security of electric core.

In a preferred embodiment, a liquid cooling plate 11 for heating and cooling is arranged below the first cell module 5 and the second cell module 6; a liquid cooling plate 11 for heating and cooling is arranged below the third cell module 12 and the fourth cell module 13.

Specifically, the liquid cooling plate 11 is arranged below the module, so that the stability and the safety of the battery cell module are improved, and when the battery cell module needs to be heated, the liquid cooling plate 11 can provide heat through circulating hot water or other heat mediums; when the cell module needs to be cooled, the liquid cooling plate 11 can absorb heat through circulating cooling liquid, and the temperature of the cell module is kept within a safe range; the heating and cooling functions of the liquid cooling plate 11 can effectively control the temperature of the battery cell module, improve the working efficiency of the battery cell and prolong the service life of the battery cell.

In summary, the utility model provides a battery cell and a battery cell module without a pole, which are applied to a power battery cell, and the module realizes the design without welding pole pieces through the optimal design of the battery cell structure, so that the material types are reduced, the cost is saved, meanwhile, the production time is shortened from the production process, the production efficiency is improved, the quality problem caused by welding defects is avoided, and the consistency and the reliability of products are improved; the reduction of materials is also beneficial to project management and improves the energy density of the product; thanks to the optimization of the structure, the FPC is simpler to arrange, meanwhile, the temperature sensor can be more conveniently and directly arranged on the battery cell, and the temperature measurement is more accurate.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included within the scope of the present utility model.

Claims (10)

1. A battery cell without a pole is characterized by comprising,

the battery cell comprises a battery cell body (1), wherein the battery cell body (1) is of a hexahedral structure, the battery cell body (1) comprises a positive electrode part and a negative electrode part, and the positive electrode part comprises at least one first positive electrode surface (2) positioned on the front surface or the back surface of the hexahedral structure and N second positive electrode surfaces adjacent to the first positive electrode surface (2);

the negative electrode part is connected with the positive electrode part, and comprises a negative electrode surface (3) of the hexahedral structure except the positive electrode part;

the positive electrode part further comprises an exhaust valve (4), and the exhaust valve (4) is arranged on one side surface of the hexahedral structure adjacent to the first positive electrode surface (2);

wherein N is a natural number of 0 or more and 4 or less.

2. The pole-free cell according to claim 1, characterized in that the side on which the exhaust valve (4) is located is the second positive or negative face (3).

3. A battery cell module without a pole is characterized in that the battery cell module comprises,

a first cell module (5) comprising M cell bodies (1) with first positive pole faces (2) arranged in a first direction, the cell bodies (1) being cell bodies (1) as claimed in claim 1 or 2;

a second cell module (6) arranged in parallel with the first cell module (5), wherein the second cell module (6) comprises M cell bodies (1) arranged in a second direction opposite to the first direction and having the first positive electrode surfaces (2);

the first connecting sheet (7) and the second connecting sheet (8) are arranged at one ends of the first cell module (5) and the second cell module (6);

and the third connecting sheet (9) is arranged at the other ends of the first cell module (5) and the second cell module (6), and M is an integer larger than 1.

4. A pole-free cell module according to claim 3, characterized in that the first connection tab (7) connects a first module tail cell (52) in the first cell module (5), and the second connection tab (8) connects a second module head cell (61) in the second cell module (6);

the third connecting sheet (9) is connected with a first module head cell (51) in the first cell module (5) and a second module tail cell (62) in the second cell module (6).

5. The pole-free cell module of claim 3, further comprising,

the third battery cell module (12) comprises M battery cell bodies (1) which are arranged towards the first direction on the first positive electrode surfaces (2);

a fourth cell module (13) arranged in parallel with the third cell module (12), wherein the fourth cell module (13) comprises M cell bodies (1) with the first positive electrode faces (2) facing the first direction;

the fourth connecting piece (14) and the fifth connecting piece (15) are respectively arranged at two ends of the third battery cell module (12) and the fourth battery cell module (13) and are connected with the third battery cell module (12) and the fourth battery cell module (13), and M is an integer larger than 1.

6. The pole-free cell module of claim 5, further comprising the fourth connection tab (14) connecting a third module header cell (121) in the third cell module (12) and a fourth module header cell (131) in the fourth cell module (13);

the fifth connecting sheet (15) is connected with a third module tail cell (122) in the third cell module (12) and a fourth module tail cell (132) in the fourth cell module (13).

7. The pole-free cell module according to claim 5, characterized in that the contact surface between two adjacent cell bodies (1) in the first cell module (5) and the second cell module (6) is coated with a conductive paste (10);

the contact surface between two adjacent cell bodies (1) in the third cell module (12) and the fourth cell module (13) is coated with the conductive paste (10).

8. The pole-free cell module according to claim 7, characterized in that both ends and both sides of the first cell module (5) and the second cell module (6) are provided with end plates locking the plurality of cell bodies (1);

the end plates for locking the plurality of cell bodies (1) are arranged at the two ends and the two sides of the third cell module (12) and the fourth cell module (13).

9. The pole-free cell module according to claim 8, characterized in that a liquid cooling plate (11) for heating and cooling is arranged below the first cell module (5) and the second cell module (6).

10. The pole-free cell module according to claim 8, wherein a liquid cooling plate (11) for heating and cooling is arranged below the third cell module (12) and the fourth cell module (13).