CN212033097U - Battery cell, battery module and power battery system - Google Patents

Abstract

The utility model belongs to the technical field of batteries, in particular to a battery cell, a battery module and a power battery system. The battery core is a plate-like structure, and a first side surface and a second side surface connected in sequence are arranged between a top plate surface and a bottom plate surface. Two side surfaces, a third side surface and a fourth side surface; the top plate surface is parallel to the bottom plate surface; at least two of the first side surface, the second side surface, the third side surface and the fourth side surface are provided with tabs. The utility model solves the problem of scattered electrical wires in the power battery system, improves the internal regularity of the power battery system, and improves the space utilization rate. The electrical wires for realizing the electrical connection between the cells will be distributed on at least two sides, so as to avoid the electrical wires for realizing the electrical connection between the cells being centrally arranged on the same side of each cell. In this way, the arrangement space of the electrical wires is widened. , reduce the difficulty of electrical wire layout.

Description

Cells, battery modules and power battery systems

technical field

The utility model belongs to the technical field of soft pack batteries, in particular to a battery cell, a battery module and a power battery system.

Background technique

The power battery system refers to an energy storage device used to provide energy for the drive of an electric vehicle, consisting of one or more battery packs and a battery management system. Including battery management components, etc. The design of the power battery system should meet the normal power requirements and other designs as the premise, and at the same time, the internal structure, safety and management design of the power battery system itself should be considered. For example, the OEM will consider the safety design, wiring harness connection design, connector design and other related requirements for the vehicle to be designed to form a limited space for the power battery system, and then under the limited space constraints, the battery module, The arrangement of BMS, thermal management system, high-voltage system, etc., ensures uniform heat dissipation of each cell, ensures the consistency of the cell, and improves the life and safety of the power battery system.

Since the tabs of the cells are all arranged on the same side, when multiple cells are stacked and used, the electrical wires that realize the electrical connection between the cells will be concentrated on the same side of the cells, and the electrical wires will be arranged on the same side. The space is denser, which increases the difficulty of electrical wire arrangement.

Utility model content

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a battery cell, which aims to solve the problem that when a plurality of battery cells are used in a stack, the electrical wires for realizing the electrical connection between the battery cells will be centrally arranged in the On the same side of each cell, the arrangement space of the electrical wires is relatively dense, which increases the technical problem of the difficulty of electrical wire arrangement.

The utility model is realized in this way:

An electric core is a plate-like structure, and a first side surface, a second side surface, a third side surface and a fourth side surface connected in sequence are arranged between the top plate surface and the bottom plate surface; the top plate surface and the bottom plate surface are The plate surfaces are parallel; at least two of the first side surface, the second side surface, the third side surface and the fourth side surface are provided with tabs.

By adopting the above technical solution, the electrical wires for realizing the electrical connection between the cells will be distributed on at least two sides, so as to avoid the electrical wires for realizing the electrical connection between the cells being concentrated on the same side of the cells. The arrangement space of the electric wires is reduced, and the difficulty of the arrangement of the electric wires is reduced.

In one embodiment, the linear distance between the two sides of the first side that intersect with the second side and the fourth side is greater than the distance between the third side and the second side and the fourth side. The straight-line distance between the two sides where the fourth side intersects.

By adopting the above technical solution, the battery cell can cooperate with the bottom case to form a battery module, and then use a plurality of battery modules to form a power battery system, which solves the problem of scattered electrical wires in the power battery system, and improves the internal efficiency of the power battery system. Regularity, and improve space utilization.

Wherein, the battery module includes a cell group and a bottom case, the cell group includes at least two of the aforementioned cells, the bottom case includes a bottom plate, and a side plate extending from the edge of the bottom plate to the other side of the battery cells The first side plate, the second side plate, the third side plate and the fourth side plate are formed by extending from the surface, the bottom plate is in contact with the bottom plate of the lowermost cell in the cell group, and the bottom plate is in contact with the bottom plate. The first side panel, the second side panel, the third side panel and the fourth side panel are respectively connected with the first side panel, the second side panel, the third side panel and the fourth side panel abutting arrangement, the second side plate is a flat plate, and the second side surface is abutting and arranged parallel to the second side surface, and the fourth side plate is a flat plate and abutting with the second side surface arranged and parallel to the fourth side surface.

In an embodiment, the first side surface is a non-circular arc surface, and is protruded in a direction away from the third side surface; or

The first side surface is a circular arc surface, and is convexly arranged in a direction away from the third side surface, and the extension surface of the second side surface and the extension surface of the fourth side surface both intersect with the corresponding first side surface. circle center.

Each battery module obtained by adopting the above technical solution can be formed by connecting end-to-end along a circular path in sequence in a circular structure.

In one embodiment, the angle formed by the second side surface and the second side surface is 360°/N, where N≧2.

For each battery module obtained by adopting the above technical solution, a power battery system can be formed only by N battery modules.

In one embodiment, the third side is flat.

For each battery module obtained by adopting the above technical solution, the cross-sectional shape of the through hole formed by the common enclosure of each fourth side plate is a polygon.

In one embodiment, the third side surface is a circular arc surface and is protruded toward the first side surface, and the extension surface of the second side surface and the extension surface of the fourth side surface both intersect with the The center of the circle corresponding to the third side surface.

For each battery module obtained by adopting the above technical solution, the cross-sectional shape of the through hole formed by the common enclosure of each fourth side plate is a circle.

Another object of the present invention is to provide a battery module, which solves the problems that the power battery system uses a lot of wire harnesses, and the wiring is inconvenient, resulting in low internal regularity and low space utilization of the power battery system.

In order to achieve this purpose, the present invention provides a battery module, which includes a battery pack and a bottom case, the battery pack includes at least two of the above-mentioned battery cells, and each of the battery cells is arranged in a tiled manner. The battery cores are stacked in the thickness direction, and the bottom case includes a bottom plate, and a first side plate, a second side plate, and a third side plate extending from the edge of the bottom plate to the other side of the battery core. and the fourth side plate, the bottom plate is in contact with the bottom plate surface of the lowermost cell in the cell group, the first side plate, the second side plate, the third side plate and the fourth side plate are respectively arranged in contact with the first side, the second side, the third side and the fourth side, the second side is a flat plate, and the second side is The side surface is in contact with and parallel to the second side surface, and the fourth side plate is a flat plate, abutted with the fourth side surface, and is parallel to the fourth side surface.

By adopting the above technical solution, at least two of the battery modules are connected end to end in sequence along a circular path; in two adjacent battery modules, the second side plate of one battery module is connected to the adjacent battery modules. The fourth plate sides of the battery module are in contact with each other; the fourth side plates together form a through hole, so that the power battery system can arrange the electric wires in the through holes when arranging the electric wires, and multiple electric wires can be arranged in the through holes. The core can act as a constraint on the electrical wires to avoid the scattered electrical wires, thereby improving the internal regularity of the power battery system and improving the space utilization rate.

In one embodiment, the board surface of the first side board is attached to the first side surface;

And/or, the board surface of the third side board is attached to the third side surface.

In one embodiment, the bottom plate, the first side plate, the second side plate, the third side plate and the fourth side plate are integral structures;

And/or, the bottom case further includes a cover plate, and the cover plate is detachably connected to the first side plate, the second side plate, the third side plate and/or the fourth side plate .

Another object of the present utility model is to provide a power battery system, which solves the problems that the power battery system uses many wire harnesses, and the wiring is inconvenient, resulting in low internal regularity and low space utilization of the power battery system.

In order to achieve this purpose, the present invention provides a power battery system, which includes at least two battery modules described above, and each of the battery modules is sequentially connected along an annular path and enclosed to form a wire through hole.

Each fourth side plate is jointly enclosed to form a through hole. In this way, when the power battery system arranges the electric wires, the electric wires can be arranged in the through holes, and the plurality of cells can restrain the electric wires and avoid the The electrical wires are scattered in disorder, thereby improving the internal regularity of the power battery system and improving the space utilization rate.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of the overall structure of the power battery system provided by the first embodiment of the present invention;

2 is an exploded view of a battery module of a power battery system provided in Embodiment 1 of the present invention;

Fig. 3 is the electric cell of the power battery system provided by the first embodiment of the present invention;

4 is a schematic diagram of the overall structure of the power battery system provided by the second embodiment of the present invention;

5 is an exploded view of the battery module of the power battery system provided by the second embodiment of the present invention;

FIG. 6 is a cell of the power battery system provided by the second embodiment of the present invention.

Description of reference numbers:

label name label name 100 battery module 110 Cell group 111 Batteries 1111 first side 1112 second side 1113 third side 1114 fourth side 1115 polar ear 120 bottom case 121 first side panel 122 second side board 123 third side board 124 Fourth side board 130 cover

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

Example 1

The embodiments of the present invention provide a power battery system, an energy storage device used to provide energy for driving an electric vehicle.

As shown in FIG. 1 , the power battery system includes at least two battery modules 100 , and the battery modules 100 are connected end to end in sequence along a circular path.

It should be noted here that the power battery system also includes a BMS (BATTERYMANAGEMENT SYSTEM, battery management system), a thermal management system, a high-voltage system, etc., as well as electrical wires for realizing electrical connection between various devices.

As shown in FIG. 2 and FIG. 3 , the battery module 100 includes a battery cell group 110 and a bottom case 120 .

The battery pack 110 includes at least two battery cells 111. The battery cells 111 are plate-like structures, and a first side surface 1111, a second side surface 1112, a third side surface 1111, a third side surface 1112, and a third side surface are sequentially connected between the top plate surface and the bottom plate surface. side 1113 and fourth side 1114; the top plate surface is parallel to the bottom plate surface; at least two of the first side 1111, the second side 1112, the third side 1113 and the fourth side 1114 are provided with tabs 1115; The cells 111 are all laid flat and stacked in the thickness direction of the cells 111 .

The bottom case 120 includes a bottom plate, and a first side plate 121 , a second side plate 122 , a third side plate 123 and a fourth side plate 124 extending from the edge of the bottom plate to the other side of the cell 111 . The bottom panel of the lowermost cell 111 in the cell group 110 is in contact with the bottom panel, and the first side panel 121 , the second side panel 122 , the third side panel 123 and the fourth side panel 124 are in contact with the first side panel 1111 , the second side panel 122 and the fourth side panel 124 respectively. The side surface 1112, the third side surface 1113 and the fourth side surface 1114 are abutted and arranged, the second side plate 122 is a flat plate, and is arranged in abutment with the second side surface 1112 and is parallel to the second side surface 1112, and the fourth side plate 124 is a flat plate, It is disposed in contact with the fourth side surface 1114 and is parallel to the fourth side surface 1114 .

In two adjacent battery modules 100 , the second side plate 122 of one battery module 100 is in contact with the fourth plate side of the adjacent battery module 100 .

Specifically, as shown in FIG. 3 , the second side 1112 and the fourth side 1114 are provided with tabs 1115 . Specifically, the second side 1112 is provided with a positive electrode 1115 , and the fourth side 1114 is provided with a negative electrode 1115 .

Based on the above structural design, the electrical wires for realizing the electrical connection between the cells 111 will be distributed on at least two sides, so as to avoid the electrical wires for realizing the electrical connection between the cells 111 being concentrated on the same side of the cells 111 . In this way, The arrangement space of the electric wires is widened, and the difficulty of arranging the electric wires is reduced.

In the embodiment of the present invention, please refer to FIG. 2 , the linear distance between the two sides of the first side 1111 intersecting with the second side 1112 and the fourth side 1114 is greater than that between the third side 1113 and the second side 1112 The straight line distance between the two sides intersecting with the fourth side surface 1114 . Each of the fourth side plates 124 together forms a through hole. In this way, when arranging the electric wires of the power battery system, the electric wires for realizing the electrical connection of each battery module 100 can be arranged in the through hole. The 100 electrical wires can act as a constraint to avoid the scattered electrical wires, thereby improving the internal regularity of the power battery system and improving the space utilization rate.

Based on the structural design of the battery cell 111 , the battery module 100 can be formed together with the aforementioned bottom case 120 , and then a plurality of battery modules 100 can be used to form the aforementioned power battery system. The internal regularity of the battery system and the improvement of space utilization.

Based on the structural design of the battery module 100 , the aforementioned power battery system can be constructed, and the scattered electrical wires in the power battery system can be solved, the internal regularity of the power battery system can be improved, and the space utilization rate can be improved.

In the embodiment of the present invention, please refer to FIG. 1 to FIG. 3 , the board surface of the first side plate 121 is attached to the first side surface 1111 , so that the structural design of the first side plate 121 and the first side surface can be reduced. 1111, so as to improve the space utilization rate of the power battery system; the plate surface of the third side plate 123 is attached to the third side 1113, and similarly, in terms of structural design, the first side plate 121 and the first side plate 121 can be reduced. The space between the side surfaces 1111 further improves the space utilization of the power battery system.

In the embodiment of the present invention, please refer to FIG. 2 , the bottom plate, the first side plate 121 , the second side plate 122 , the third side plate 123 and the fourth side plate 124 are integrated into one structure, which is convenient for the bottom plate, the first side plate 121 , the second side plate 122 , the third side plate 123 and the fourth side plate 124 are integrally formed and formed without subsequent assembly.

In the embodiment of the present invention, please refer to FIG. 2 , the battery module 100 further includes a cover plate 130 , and the cover plate 130 is detachably connected to the first side plate 121 , the second side plate 122 , the third side plate 123 and the fourth side plate 123 . The side plate 124, in this way, facilitates the assembly and molding of the battery module 100. Specifically, after the battery pack 110 is placed in the bottom case 120, the cover plate 130 can be covered.

In other embodiments, the cover plate 130 can also be detachably connected to one, two or three of the first side plate 121 , the second side plate 122 , the third side plate 123 and the fourth side plate 124 .

In the embodiment of the present invention, please refer to FIG. 1 to FIG. 3 , the first side surface 1111 is a circular arc surface, and is convexly arranged in the direction away from the third side surface 1113 , the extension surface of the second side surface 1112 and the fourth side surface 1114 are The extension surfaces all intersect at the center of the circle corresponding to the first side surface 1111 . It can be seen from the foregoing structure that the structural shape of the bottom case 120 matches the structure formed by stacking a plurality of battery cells 111 . Based on this, each battery module 100 obtained by connecting end to end along a circular path can form a ring structure.

Of course, in other embodiments, the first side surface 1111 is a non-circular arc surface, and is protruded in a direction away from the third side surface 1113 .

In the embodiment of the present invention, please refer to FIG. 1 to FIG. 3 , the angle formed by the second side surface 1112 and the second side surface 1112 is 360°/N, where N is the number of battery modules 100 , and N≧2. Combining the above structure, it can be known that the structure and shape of the bottom case 120 matches the structure formed by stacking a plurality of cells 111 . Based on this, each battery module 100 obtained can form a power battery system with only N battery modules 100 .

Wherein, N is preferably 3 to 8, that is, the radian of the first side surface 1111 is 45°˜120°.

In this embodiment, N is 6, that is, the radian of the first side surface 1111 is 60°.

In the embodiment of the present invention, please refer to FIGS. 1 to 3 , the length of the second side 1112 from the first side 1111 to the third side 1113 is equal to the length of the fourth side 1114 from the first side 1111 to the third side 1113 .

In the embodiment of the present invention, please refer to FIG. 1 to FIG. 3 , the third side surface 1113 is flat. Combining with the foregoing structure, it can be seen that the structure and shape of the bottom case 120 matches the structure formed by stacking a plurality of battery cells 111 . Based on this, the In each of the battery modules 100, the cross-sectional shape of the through hole formed by the fourth side plates 124 is a polygon.

In the present invention, the battery cell 111 is a soft-packed cell 111, and the soft-packed cell 111 is structurally packaged with aluminum-plastic film. Explosion like steel or aluminum case battery 111; light weight, soft pack battery 111 is 40% lighter than a steel case lithium battery of the same capacity.

It should be noted here that when the battery cell 111 is a soft-packed cell 111, based on the structural characteristics of the soft-packed cell 111, the first side 1111, the second side 1112, the third side 1113 and the fourth side 1114 are related to the electrical Both sides of the cell 111 are transitioned through arcs, and the actual dimensions of the first side 1111 , the second side 1112 , the third side 1113 and the fourth side 1114 in the thickness direction of the cell 111 are relatively small.

It should be noted here that the battery cells 111 will have tabs 1115 for realizing electric energy exchange outside the battery cells 111 , and the location of the tabs 1115 can be set according to the actual situation.

Of course, in combination with the battery cell 111 being the soft-wrapped battery cell 111 , the contact of the tab 1115 against the bottom case 120 will cause a certain indentation at the corresponding position of the battery cell 111 .

Embodiment 2

As shown in FIG. 4 and FIG. 6 , the difference between this embodiment and the first embodiment is that the third side surface 1113 is a circular arc surface, and is convexly arranged in the direction of the first side surface 1111 , the extension surface of the second side surface 1112 and the fourth side surface 1114 The extension surfaces of 1113 all intersect at the center of the circle corresponding to the third side surface 1113 . It can be seen from the foregoing structure that the structural shape of the bottom case 120 matches the structure formed by stacking a plurality of battery cells 111 . Based on the obtained battery modules 100 , the cross-sectional shapes of the through holes formed by the fourth side plates 124 are jointly enclosed. is circular.

The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present utility model shall be included in the present utility model. within the scope of protection.

Claims (10)

1. A cell, characterized in that it is a plate-like structure, and is provided with a first side surface, a second side surface, a third side surface and a fourth side surface connected in sequence between the top plate surface and the bottom plate surface; The board surface is parallel to the bottom board surface; at least two of the first side surface, the second side surface, the third side surface and the fourth side surface are provided with tabs. 2 . The battery cell according to claim 1 , wherein a linear distance between two sides of the first side surface intersecting with the second side surface and the fourth side surface is greater than that of the third side surface. 3 . The straight line distance between the two sides of the side that intersect with the second side and the fourth side. 3. The battery cell according to claim 2, wherein the first side surface is a non-circular arc surface, and is protruded in a direction away from the third side surface; or The first side surface is a circular arc surface, and is convexly arranged in a direction away from the third side surface, and the extension surface of the second side surface and the extension surface of the fourth side surface both intersect with the corresponding first side surface. circle center. 4 . The battery cell according to claim 2 , wherein the angle formed by the second side surface and the fourth side surface is 360°/N, wherein N≧2. 5 . 5 . The battery cell of claim 2 , wherein the third side surface is flat. 6 . 6 . The battery cell according to claim 2 , wherein the third side surface is a circular arc surface and protrudes toward the direction of the first side surface, and the extension surface of the second side surface is connected to the first side surface. 7 . The extension surfaces of the four side surfaces all intersect at the center of the circle corresponding to the third side surface. 7. A battery module, comprising a battery pack and a bottom case, the battery pack comprising at least two batteries according to any one of claims 1 to 6, each of the batteries They are arranged evenly and stacked in the thickness direction of the battery core. The bottom case includes a bottom plate, and a first side plate, a second side plate, a first side plate, a second side plate extending from the edge of the bottom plate plate to the other side plate surface of the battery core. The second side board, the third side board and the fourth side board, the bottom plate is in contact with the bottom board surface of the lowermost cell in the cell group, the first side board, the second side board The board, the third side board and the fourth side board are respectively arranged in abutment with the first side surface, the second side surface, the third side surface and the fourth side surface, and the second side board is a flat plate with the second side abutting on and parallel to the second side, and the fourth side plate is a flat plate, abutting with the fourth side, and parallel to the fourth side . 8 . The battery module according to claim 7 , wherein the board surface of the first side plate is attached to the first side surface; 8 . And/or, the board surface of the third side board is attached to the third side surface. 9 . The battery module according to claim 7 , wherein the bottom plate, the first side plate, the second side plate, the third side plate and the fourth side plate are integrated into one body. 10 . structure; And/or, the battery module further includes a cover plate, and the cover plate is detachably connected to the first side plate, the second side plate, the third side plate and/or the fourth side plate. 10. A power battery system, characterized in that it comprises at least two battery modules according to any one of claims 7 to 9, and each of the battery modules is sequentially connected along an annular path and enclosed to form a battery module. Through-wire vias.

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