CN118231885A - Energy storage device - Google Patents

Abstract

The energy storage device provided by the embodiment of the application comprises a plurality of battery cell groups and a heat exchange plate, wherein the battery cell groups are stacked in the height direction of the energy storage device, each battery cell group comprises a plurality of battery strings extending along the length direction of the energy storage device, the battery strings are arranged side by side in the width direction of the energy storage device, and heat exchange gaps are formed between the adjacent battery strings. The heat exchange plates of the energy storage device are arranged in the heat exchange gaps along the height direction of the energy storage device, and on the basis of being convenient for fixing the heat exchange plates, the contact area between the heat exchange plates and the battery cell group is increased, and the heat dissipation efficiency in the energy storage device is ensured.

Description

Energy storage device

Technical Field

The application belongs to the technical field of energy storage, and particularly relates to an energy storage device.

Background

In order to facilitate the movement and transportation of energy storage devices, a container type energy storage device is gradually developed. A plurality of battery cabinets are arranged in a common container type energy storage device, and a battery pack for storing energy is arranged in each battery cabinet. The battery packs can generate a large amount of heat in the charge and discharge process, and a corresponding heat dissipation device is arranged in the container type energy storage device for cooling the battery packs.

The traditional heat dissipation device is mainly realized through a pipeline, but because the contact area between the pipeline and the battery pack is limited, the heat dissipation device has great application limitation on heat dissipation of the battery pack, and the heat dissipation efficiency of the container type energy storage device is reduced.

Disclosure of Invention

An object of the embodiment of the application is to provide a new technical scheme of an energy storage device, which can solve the problem of low heat dissipation efficiency of the traditional energy storage device.

According to a first aspect of an embodiment of the present application, there is provided an energy storage device having a length, a width and a height, the energy storage device comprising:

The battery cell groups are stacked in the height direction of the energy storage device, each battery cell group comprises a plurality of battery strings extending along the length direction of the energy storage device, the battery strings are arranged side by side in the width direction of the energy storage device, and heat exchange gaps are formed between adjacent battery strings;

and the heat exchange plate is arranged in the heat exchange gap along the height direction of the energy storage device so as to exchange heat for a plurality of battery cell groups at the same time.

Optionally, the heat exchange device comprises a plurality of heat exchange plates, and the plurality of heat exchange plates are arranged in the plurality of heat exchange gaps side by side in the width direction of the energy storage device.

Optionally, the heat exchanger further comprises a connection plate extending in a width direction of the energy storage device and configured to communicate with a plurality of the heat exchange plates.

Optionally, the connecting plates include a first connecting plate and a second connecting plate, the first connecting plate is communicated with a plurality of heat exchange plates and provided with a first interface, and the second connecting plate is communicated with a plurality of heat exchange plates and provided with a second interface;

the heat exchange medium in the heat exchange plate flows into the heat exchange plate from the first interface and flows out of the heat exchange plate from the second interface.

Optionally, the heat exchange plate comprises a plurality of heat exchange sub-plates, wherein heat exchange flow channels are arranged in the heat exchange sub-plates, and the heat exchange flow channels in the adjacent heat exchange sub-plates are communicated after the plurality of heat exchange sub-plates are spliced.

Optionally, the battery string includes a plurality of electric cells, the top of electric cell has positive pole post and negative pole post that homonymy was drawn forth, the electric core group includes a plurality of connection piece, and a plurality of connection piece is configured to connect adjacent the opposite pole post of electric cell.

Optionally, the battery cell group further comprises a partition board, and the partition board is clamped between the adjacent battery cell groups;

the separator comprises a plurality of sub-separators which are arranged side by side in the width direction of the energy storage device, and the sub-separators are arranged corresponding to the battery strings;

the top side of the sub-partition board is provided with a protrusion, the bottom of the battery cell is provided with a groove, and the protrusion is in nested fit with the groove so as to locate the battery cell.

Optionally, a first channel along the length direction of the energy storage device is arranged at the bottom side of the sub-separator, and the connecting sheet is embedded and matched with the first channel.

Optionally, the battery cell further comprises a sampling line, wherein the sampling line is connected with the positive electrode column and/or the negative electrode column of the battery cell;

The bottom side of the sub-partition plate is provided with a second channel along the length direction of the energy storage device, and the sampling line is embedded and matched with the second channel.

Optionally, the bottom side of the sub-partition is provided with two first channels and one second channel, and one second channel is located between the two first channels.

The application has the technical effects that:

The energy storage device provided by the embodiment of the application comprises a plurality of cell groups and a heat exchange plate, wherein the cell groups are stacked in the height direction of the energy storage device, each cell group comprises a plurality of battery strings extending along the length direction of the energy storage device, the battery strings are arranged side by side in the width direction of the energy storage device, and heat exchange gaps are formed between adjacent battery strings. The heat exchange plates of the energy storage device are arranged in the heat exchange gaps along the height direction of the energy storage device, and on the basis of being convenient for the heat exchange plates to be fixed, the contact area between the heat exchange plates and the battery cell group is increased, and the heat dissipation efficiency in the energy storage device is ensured.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a perspective view of an energy storage device according to an embodiment of the present application;

FIG. 2 is an exploded view of an energy storage device according to an embodiment of the present application;

FIG. 3 is an exploded view of a battery cell of an energy storage device according to an embodiment of the present application;

fig. 4a is a schematic diagram of a battery cell of an energy storage device according to an embodiment of the present application;

fig. 4b is a schematic diagram of the bottom of a battery cell of an energy storage device according to an embodiment of the present application;

FIG. 5a is a schematic view of a portion of a sub-separator of an energy storage device according to an embodiment of the present application;

FIG. 5b is a schematic bottom view of a sub-separator of an energy storage device according to an embodiment of the present application;

Fig. 6 is a schematic diagram of cooperation between a heat exchange plate and a connection plate of an energy storage device according to an embodiment of the present application.

Wherein:

1. A cell group; 11. a battery string; 111. a battery cell; 112. a groove; 12. a connecting sheet; 13. a partition plate; 130. a sub-separator; 131. a protrusion; 132. a first channel; 133. a second channel; 134. a third channel; 2. a heat exchange plate; 21. a heat exchanger sub-plate; 22. a pipe; 3. a connecting plate; 31. a first connection plate; 32. a second connecting plate; 33. a first interface; 34. a second interface; 4. a sampling line; 5. a total positive terminal; 6. a total negative terminal; 7. and a copper bar.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 and 2, an embodiment of the present application provides an energy storage device having a length, a width, and a height, the energy storage device comprising:

A plurality of cell groups 1 and heat exchange plates 2, wherein in the height direction of the energy storage device, the plurality of cell groups 1 are stacked, the cell groups 1 comprise a plurality of battery strings 11 extending along the length direction of the energy storage device, the plurality of battery strings 11 are arranged side by side in the width direction of the energy storage device, and heat exchange gaps are formed between adjacent battery strings 11;

Referring to fig. 2, the heat exchange plate 2 is disposed in the heat exchange gap along the height direction of the energy storage device, so as to exchange heat for a plurality of the battery cell groups 1 at the same time.

Specifically, the energy storage device may be integrally rectangular, the length direction of the energy storage device may be an X direction in fig. 1, the width direction of the energy storage device may be a Y direction in fig. 1, and the height direction of the energy storage device may be a Z direction in fig. 1, that is, a vertical direction in which the energy storage device is located.

When the plurality of battery cell groups 1 are stacked in the vertical direction, the stacking layer number of the battery cell groups 1 can be flexibly controlled according to the height space of the energy storage device, and the battery capacity of the energy storage device is improved on the basis of reducing the occupied area of the energy storage device.

The heat exchange gaps in the plurality of battery cell groups 1 can be vertically opposite to each other, so that the heat exchange plates 2 extend from the top of the energy storage device to the bottom of the energy storage device in the vertical direction, and on the basis of being convenient for fixing the heat exchange plates 2, the contact area between the heat exchange plates 2 and the battery cell groups 1 is increased, and the heat dissipation efficiency of the energy storage device is ensured.

In one embodiment, the single-core housing in the battery cell group 1 can meet the requirements of fire prevention, insulation and pressure bearing, so that the shell of the single battery cell can be conveniently used as a protective shell to realize the large-capacity setting of the single battery cell; and a plurality of single battery cores form a structure that a plurality of battery core groups 1 are stacked after being stacked, CTS (Cell To System) technologies can be realized, the use of battery PACK (battery core assembly group) is not needed, and the space utilization rate in the energy storage device is improved. For example, a plurality of battery cell groups 1 can be directly stacked and assembled in a 20-ruler container, so that the transportation convenience of the energy storage device is improved.

The energy storage device provided by the embodiment of the application comprises a plurality of cell groups 1 and heat exchange plates 2, wherein in the height direction of the energy storage device, the plurality of cell groups 1 are arranged in a stacked manner, the cell groups 1 comprise a plurality of battery strings 11 extending along the length direction of the energy storage device, the plurality of battery strings 11 are arranged side by side in the width direction of the energy storage device, and heat exchange gaps are formed between adjacent battery strings 11; the heat exchange plate 2 is arranged in the heat exchange gap along the height direction of the energy storage device, and the heat dissipation efficiency in the energy storage device is ensured by improving the contact area between the heat exchange plate 2 and the battery cell group 1 on the basis of being convenient for fixing the heat exchange plate 2.

Alternatively, referring to fig. 2, the energy storage device includes a plurality of the heat exchange plates 2, and the plurality of the heat exchange plates 2 are arranged side by side in the plurality of the heat exchange gaps in the width direction of the energy storage device.

Specifically, each of the battery cell groups 1 may include at least three battery strings 11 extending along the length direction of the energy storage device, so that at least two heat exchange gaps are formed between adjacent battery strings 11 in each of the battery cell groups 1; the number of the heat exchange plates 2 may be matched with the number of the heat exchange gaps formed in each cell group 1, so that a plurality of the heat exchange plates 2 are arranged in the plurality of the heat exchange gaps side by side in the width direction of the energy storage device, and each heat exchange plate 2 is clamped between adjacent cell strings 11, so as to improve the heat exchange effect of the heat exchange plates 2 on the cell groups 1.

In an embodiment, the heat exchange plate 2 may be a liquid cooling plate, and when the operation temperature of the battery cell group 1 in the energy storage device is higher, heat exchange between the cooling liquid in the liquid cooling plate and the battery cell group 1 may be performed, so as to ensure the stability of the operation of the battery cell group 1 in the energy storage device.

Optionally, referring to fig. 6, the energy storage device further comprises a connection plate 3, the connection plate 3 extending in a width direction of the energy storage device and being configured to communicate with a plurality of the heat exchange plates 2.

Specifically, when the heat exchange plates 2 are arranged in the heat exchange gaps side by side in the width direction of the energy storage device, in order to simplify the circulation pipeline of the heat exchange medium in the heat exchange plates 2, the heat exchange flow channels in the heat exchange plates 2 can be extended and communicated in the width direction of the energy storage device through the connecting plate 3, so that the heat exchange medium in the heat exchange plates 2 can flow into the heat exchange flow channels in the heat exchange plates 2 from the connecting plate 3 and then be distributed to the heat exchange flow channels in the heat exchange plates 2, and the flow balance among the heat exchange plates 2 is ensured.

In addition, when the heat exchange plates 2 are arranged in the heat exchange gaps side by side in the width direction of the energy storage device, the heat exchange medium in the heat exchange plates 2 can also flow independently, so that the flow and the temperature of the heat exchange medium in each heat exchange plate 2 can be controlled flexibly.

In one embodiment, as shown in fig. 6, the connection plate 3 comprises a first connection plate 31 and a second connection plate 32, the first connection plate 31 communicating with a plurality of the heat exchange plates 2 and having a first interface 33, the second connection plate 32 communicating with a plurality of the heat exchange plates 2 and having a second interface 34;

the heat exchange medium in the heat exchange plate 2 flows into a plurality of heat exchange channels (shown by arrow dotted lines in fig. 6) in the heat exchange plate 2 from the first interface 33, and flows out of the heat exchange channels (shown by arrow dotted lines in fig. 6) in the heat exchange plate 2 from the second interface 34 after the heat exchange of the heat exchange medium is finished, so as to improve the structural integration of the heat exchange plate 2.

In addition, when a plurality of heat exchange plates 2 are arranged in a plurality of heat exchange gaps side by side, the circulation inlet and the circulation outlet of the heat exchange medium on the heat exchange plates 2 can be positioned at the top side of the stacked battery cell group 1, so that the first connection plate 31 and the second connection plate 32 can be communicated with the heat exchange flow channels in the plurality of heat exchange plates 2 at the top side of the stacked battery cell group 1.

Alternatively, referring to fig. 6, the heat exchange plate 2 includes a plurality of heat exchange sub-plates 21, heat exchange channels are provided in the heat exchange sub-plates 21, and the heat exchange channels in adjacent heat exchange sub-plates 21 are communicated after the plurality of heat exchange sub-plates 21 are spliced.

Specifically, the energy storage device may be a large container type energy storage device, so that the heat exchange plate 2 is also large in size; in order to facilitate the preparation of the heat exchange plate 2, a plurality of heat exchange sub-plates 21 with relatively small sizes can be formed first, the heat exchange sub-plates 21 are spliced to form a large-size heat exchange plate 2, and heat exchange flow channels in adjacent heat exchange sub-plates 21 can be communicated through a pipeline 22, so that the continuity of the flow of heat exchange medium in the heat exchange plate 2 is ensured.

In one embodiment, referring to fig. 6, each heat exchange plate 2 includes four heat exchange sub-plates 21, and after the four heat exchange sub-plates 21 are continuously spliced to form one heat exchange plate 2, heat exchange channels in the heat exchange sub-plates 21 are indicated by dotted lines in the first heat exchange sub-plate 21 on the left side, and the heat exchange channels in each heat exchange sub-plate 21 can be bent and extended to improve the heat exchange efficiency of the heat exchange plate 2.

Alternatively, referring to fig. 3 and 4a, the battery string 11 includes a plurality of battery cells 111, the top of the battery cells 111 has positive and negative poles led out from the same side, and the battery cell group 1 includes a plurality of connection pieces 12, and the plurality of connection pieces 12 are configured to connect opposite poles of adjacent battery cells 111.

Specifically, among the plurality of battery cells 111 of the battery string 11, the positive electrode post and the negative electrode post between the adjacent battery cells 111 can be reversely arranged, so that opposite electrode posts between the adjacent battery cells 111 are opposite, and the adjacent battery cells 111 are conveniently connected in series through the connecting sheet 12, so that sequential connection among the plurality of battery cells 111 in the battery string 11 and connection among the adjacent battery strings 11 are realized, and the output voltage of the battery cell group 1 is improved.

Referring to fig. 3, 4b and 5a, the cell unit 1 further includes a partition 13, and the partition 13 is sandwiched between adjacent cell units 1;

The separator 13 includes a plurality of sub-separators 130 arranged side by side in the width direction of the energy storage device, the sub-separators 130 being arranged in correspondence with the battery strings 11;

the top side of the sub-separator 130 is provided with a protrusion 131, the bottom of the battery cell 111 is provided with a groove 112, and the protrusion 131 is in nested fit with the groove 112 to locate the battery cell 111.

Specifically, the separator 13 may be an insulating separator such as a PE separator or a PP separator, and when the separator 13 is sandwiched between the adjacent cell groups 1, it may form physical insulation for the adjacent cell groups 1, so as to avoid electrical interference between the adjacent cell groups 1.

The separator 13 may include a plurality of sub-separators 130 disposed side by side in the width direction of the energy storage device, where each sub-separator 130 is disposed corresponding to one battery string 11, and since the battery string 11 includes a plurality of individual battery cells 111, the protrusions 131 on the top of the sub-separator 130 may be nested with the grooves 112 disposed at the bottoms of the plurality of battery cells 111 in one battery string 11, so as to limit the plurality of battery cells 111 in one battery string 11, thereby facilitating stacking of the battery strings 11 in the vertical direction in the battery cell group 1.

Optionally, referring to fig. 5b, a first channel 132 along the length direction of the energy storage device is provided on the bottom side of the sub-separator 130, and the connecting piece 12 is in embedded fit with the first channel 132.

Specifically, when the plurality of battery cells 111 in the battery strings 11 are serially connected in sequence through the connecting pieces 12, two rows of connecting pieces 12 as shown in fig. 3 are formed at the top of one battery string 11; in order to facilitate the position matching between the connecting pieces 12 and the sub-separators 130, two side edges of the bottom of the sub-separators 130 may form a blocking wall as shown in fig. 5b, the blocking wall extends along the length direction of the battery string 11, and a plurality of protrusions may be formed in the middle position of the bottom of the sub-separators 130, so that two first channels 132 are formed between the blocking wall on two sides and the protrusion in the middle, respectively, so that two rows of connecting pieces 12 on one battery string 11 are embedded in correspondence with the two first channels 132, and on the basis of ensuring the connection stability between the connecting pieces 12 and the opposite poles of the adjacent battery cells 111, the compactness of the stacked arrangement of the battery cell group 1 is improved.

Optionally, referring to fig. 3 to 5b, the energy storage device further comprises a sampling line 4, the sampling line 4 being connected with the positive and/or negative pole of the cell 111;

The bottom side of the sub-separator 130 is provided with a second channel 133 along the length direction of the energy storage device, and the sampling line 4 is embedded and matched with the second channel 133.

Specifically, the sampling line 4 may be located at a middle position of the top of the battery cell 111 after being connected to the positive electrode column and the negative electrode column of the battery cell 111, so as to sample the temperature and the voltage of the positive electrode column position and the negative electrode column position of the battery cell 111, thereby ensuring the operation condition of the battery cell group 1 in real time and ensuring the use safety of the battery cell group 1. And the number of sampling lines 4 in the energy storage device may be plural, and each sampling line 4 is disposed corresponding to one battery string 11.

The plurality of protrusions at the bottom of the sub-separator 130 may form two rows along the length direction of the sub-separator 130, the second channel 133 is formed between the two rows of protrusions, and the sampling line 4 is embedded and matched with the second channel 133, so as to ensure the stability of connection between the sampling line 4 and the positive electrode column and the negative electrode column of the battery cell 111; in order to facilitate connection between the sampling line 4 and the positive and negative poles located on both sides of the sampling line 4, a third channel 134 may be formed between adjacent protrusions in the same row of protrusions, and the third channel 134 may be configured to form a direct channel for connecting the sampling line 4 with the positive and negative poles of the cell, for example, by providing a cable in the third channel 134 to connect the sampling line 4 with the positive and negative poles of the cell 111.

Alternatively, referring to fig. 5b, the sub-partition 130 is provided at a bottom side thereof with two first channels 132 and one second channel 133, and one second channel 133 is located between the two first channels 132.

Specifically, the sampling line 4 may be disposed between the positive electrode column and the negative electrode column on the electrical core 111, and the two rows of connection pieces 12 on the electrical core 111 may respectively correspond to the positive electrode column and the negative electrode column on the electrical core 111, so that the sampling line 4 is located between the two rows of connection pieces 12, mutual interference between the sampling line 4 and the connection pieces 12 is avoided, and space on the upper portion of the electrical core 111 is fully utilized.

And when one second channel 133 is located between two first channels 132, one sampling line 4 is embedded with one second channel 133, and two rows of connecting pieces 12 are respectively embedded with two first channels 132, so that the compactness of the stacking arrangement of the battery cell group 1 can be improved.

In addition, referring to fig. 2, after the plurality of the cell groups 1 are stacked, they may be connected in series through the copper bars 7, or may be connected in parallel through the copper bars 7, or may form a serial-parallel connection form through the copper bars 7; and the plurality of the battery cell groups 1 can form a total positive terminal 5 and a total negative terminal 6 after being stacked, wherein the total positive terminal 5 is positioned on the bottom battery cell group 1 in the plurality of the battery cell groups 1, and the total negative terminal 6 is positioned on the top battery cell group 1 in the plurality of the battery cell groups 1.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims (10)

1. An energy storage device, wherein the energy storage device has a length, a width, and a height, the energy storage device comprising:

The battery cell assembly comprises a plurality of battery cell assemblies (1), wherein the battery cell assemblies (1) are stacked in the height direction of the energy storage device, the battery cell assemblies (1) comprise a plurality of battery strings (11) extending along the length direction of the energy storage device, the battery strings (11) are arranged side by side in the width direction of the energy storage device, and heat exchange gaps are formed between adjacent battery strings (11);

The heat exchange plates (2) are arranged in the heat exchange gaps along the height direction of the energy storage device, so that heat exchange is performed on the plurality of cell groups (1) at the same time.

2. Energy storage device according to claim 1, characterized in that it comprises a plurality of said heat exchanger plates (2), a plurality of said heat exchanger plates (2) being arranged side by side in a plurality of said heat exchanging gaps in the width direction of the energy storage device.

3. Energy storage device according to claim 2, further comprising a connection plate (3), which connection plate (3) extends in the width direction of the energy storage device and is configured to communicate with a plurality of the heat exchanger plates (2).

4. A storage device according to claim 3, characterized in that the connection plate (3) comprises a first connection plate (31) and a second connection plate (32), the first connection plate (31) communicating with a plurality of the heat exchanger plates (2) and having a first interface (33), the second connection plate (32) communicating with a plurality of the heat exchanger plates (2) and having a second interface (34);

The heat exchange medium in the heat exchange plate (2) flows into the heat exchange plate (2) from the first interface (33) and flows out of the heat exchange plate (2) from the second interface (34).

5. The energy storage device according to claim 1, wherein the heat exchange plate (2) comprises a plurality of heat exchange sub-plates (21), wherein heat exchange flow channels are arranged in the heat exchange sub-plates (21), and the heat exchange flow channels in the adjacent heat exchange sub-plates (21) are communicated after the plurality of heat exchange sub-plates (21) are spliced.

6. The energy storage device according to claim 1, wherein the battery string (11) comprises a plurality of battery cells (111), the top of the battery cells (111) having positive and negative poles led out on the same side, the battery cell group (1) comprising a plurality of connection tabs (12), the plurality of connection tabs (12) being configured to connect opposite poles of adjacent battery cells (111).

7. The energy storage device according to claim 6, wherein the cell groups (1) further comprise a separator (13), the separator (13) being sandwiched between adjacent cell groups (1);

The separator (13) comprises a plurality of sub-separators (130) arranged side by side in the width direction of the energy storage device, and the sub-separators (130) are arranged corresponding to the battery strings (11);

The top side of the sub-partition plate (130) is provided with a protrusion (131), the bottom of the battery cell (111) is provided with a groove (112), and the protrusion (131) is in nested fit with the groove (112) so as to locate the battery cell (111).

8. The energy storage device according to claim 7, wherein the bottom side of the sub-separator (130) is provided with a first channel (132) along the length direction of the energy storage device, and the connecting piece (12) is in embedded fit with the first channel (132).

9. Energy storage device according to claim 8, further comprising a sampling line (4), the sampling line (4) being connected with a positive and/or negative post of the cell (111);

The bottom side of the sub-partition plate (130) is provided with a second channel (133) along the length direction of the energy storage device, and the sampling line (4) is embedded and matched with the second channel (133).

10. The energy storage device according to claim 9, wherein the bottom side of the sub-separator (130) is provided with two first channels (132) and one second channel (133), one second channel (133) being located between the two first channels (132).