Battery module and energy storage system

Abstract

The utility model belongs to the technical field of batteries, and relates to a battery module which comprises a liquid cooling bracket and battery groups arranged on two sides of the liquid cooling bracket, the liquid cooling support is provided with a heat dissipation area. The battery groups are arranged in the heat dissipation area, each battery group comprises at least two battery packs, the multiple battery packs are arranged at intervals in the first direction, each battery pack comprises at least two battery monomers, and the multiple battery monomers are arranged at intervals in the second direction; the battery monomer is vertically arranged on the liquid cooling bracket, the battery monomer is provided with a positive plate, a negative plate, an electrolytic tank and a liquid injection port, the positive plate and the negative plate are arranged on the opposite sides of the battery monomer in the second direction and are respectively inserted into the bottom of the electrolytic tank, and the liquid injection port is formed in the top of the positive plate and / or the negative plate. The utility model further relates to an energy storage system. According to the technical scheme provided by the invention, the energy density of the battery module can be optimized, the battery module has good heat dissipation performance, and the performance and the service life of the battery monomer are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery module and an energy storage system. Background Art

[0002] The core of an energy storage system lies in its energy system, namely the battery module. Battery modules must simultaneously possess high energy density, stability, and heat dissipation performance to meet the demands of power-consuming devices. Therefore, battery modules typically integrate multiple battery cells.

[0003] The battery modules in existing energy storage systems usually adopt a lamination process to facilitate lying and stacking multiple battery cells. During the transportation of the energy storage system, this assembly method will cause the electrolyte inside the battery cells to flow back and forth due to inertia, so that the positive or negative pole of the battery cells may not contact the electrolyte, thereby affecting the performance and service life of the battery cells in the battery module. In addition, the lamination process method will cause a certain amount of heat transfer between adjacent battery cells when multiple battery cells are stacked, which will cause serious heating in the battery module, thereby affecting the performance and service life of the battery module. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the present application is that the existing assembly method of battery modules leads to performance degradation and shortened service life of battery cells.

[0005] In order to solve the above technical problems, the present invention provides a battery module that adopts the following technical solutions:

[0006] A battery module comprises a liquid cooling bracket and battery groups mounted on both sides of the liquid cooling bracket;

[0007] The liquid cooling bracket is provided with a heat dissipation area;

[0008] The battery group is installed in the heat dissipation area, each battery group includes at least two battery groups, and the multiple battery groups are arranged at intervals along a first direction. Each battery group includes at least two battery cells, and the multiple battery cells are arranged at intervals along a second direction, wherein the first direction is the height direction of the liquid cooling bracket, and the second direction is the width direction of the liquid cooling bracket;

[0009] The battery cell is vertically mounted on the liquid-cooling bracket, and the battery cell has a positive plate, a negative plate, an electrolytic cell and a liquid injection port. The positive plate and the negative plate are arranged on opposite sides of the battery cell in the second direction. The positive plate and the negative plate are respectively inserted into the bottom of the electrolytic cell, and the liquid injection port is provided at the top of the positive plate and / or the negative plate.

[0010] Furthermore, the liquid cooling bracket includes a vertical plate and a carrier plate, the vertical plate is mounted on the carrier plate; a heat dissipation area is provided on the vertical plate, and the battery group is mounted on the vertical plate and is located in the heat dissipation area.

[0011] Furthermore, the vertical plate has at least one liquid inlet and at least one liquid outlet, a cooling pipeline is formed between the liquid inlet and the liquid outlet, and the area of ​​the vertical plate corresponding to the area through which the cooling pipeline flows forms the heat dissipation area.

[0012] Furthermore, the cooling pipeline is bent at least once from the liquid inlet to form a bent portion and then extends toward the liquid outlet.

[0013] Furthermore, the number of the cooling pipes is at least two, and the plurality of cooling pipes are relatively staggered from the bending portion.

[0014] Furthermore, the battery module further includes a first electrical connector, and the two battery packs located on both sides of the liquid cooling bracket and on the same horizontal plane are connected in parallel via the first electrical connector; and / or

[0015] The battery module further includes a second electrical connector, and two adjacent battery cells in each battery pack are connected in series via the second electrical connector.

[0016] Furthermore, the distance between two adjacent battery cells in each battery pack is 2 mm to 3 mm; and / or

[0017] The distance between two adjacent battery packs in each battery group is 100 mm to 120 mm.

[0018] Furthermore, the battery module further includes a heat-conducting connector, which is used to mount each of the battery cells on the liquid-cooling bracket.

[0019] Furthermore, the thermal conductivity of the thermally conductive connector is 2-3.

[0020] In order to solve the above technical problems, the embodiment of the present application further provides an energy storage system, which adopts the following technical solutions:

[0021] An energy storage system, characterized in that it comprises a box and at least one set of power supply devices, wherein the power supply devices are installed in the box;

[0022] At least one power supply mounting frame is provided in the box, and the number of the power supply mounting frame is consistent with the number of the power supply devices, wherein the height direction of the power supply mounting frame is arranged along the first direction, the width direction of the power supply mounting frame is arranged along the second direction, and the length direction of the power supply mounting frame is arranged along the third direction, and the third direction is perpendicular to the first direction and the second direction;

[0023] The power supply device is mounted on a corresponding power supply mounting frame. The power supply device includes at least two groups of battery modules as described above. The multiple groups of battery modules are arranged at intervals along the third direction.

[0024] Furthermore, the power supply device also includes a heat insulating member, which is installed between two adjacent battery modules.

[0025] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0026] The battery module provided by the present application is configured to dissipate heat from multiple battery cells in the battery group by arranging the battery groups on both sides of a liquid-cooled bracket, thereby facilitating the liquid-cooling plate to dissipate heat from multiple battery cells in the battery group and reducing the heat generated during operation of the battery module, thereby improving the performance and service life of the battery module during operation. At the same time, the battery cells are vertically mounted on the liquid-cooled bracket, and the positive and negative plates are respectively plugged into the bottom of the electrolytic cell. During the transportation of the battery module, the positive and negative plates are ensured to be in contact with the electrolyte at all times, thereby improving the performance and service life of the battery. In addition, by rationally arranging the layout of the battery cells in the battery group so that they are evenly distributed on both sides of the liquid-cooled bracket, the energy density of the battery module is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the solution of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 is a schematic structural diagram of a battery module according to an embodiment of the present application;

[0029] Figure 2 is a side view of a battery module according to an embodiment of the present application;

[0030] Figure 3 is a cross-sectional schematic diagram of a battery cell according to an embodiment of the present application;

[0031] Figure 4 is a cross-sectional schematic diagram of a vertical plate according to an embodiment of the present application;

[0032] Figure 5 is a cross-sectional schematic diagram of a vertical plate of another embodiment of the present application;

[0033] Figure 6 It is a structural diagram of the energy storage system of an embodiment of the present application.

[0034] Reference numerals:

[0035] 10. Box body; 20. Power supply unit; 1. Liquid-cooling bracket; 11. Vertical plate; 111. Liquid inlet; 112. Liquid outlet; 113. Cooling pipe; 1131. Bending portion; 12. Carrier plate; 121. Positioning column; 2. Battery group; 21. Battery pack; 211. Battery cell; 2111. Positive plate; 2112. Negative plate; 2113. Electrolytic cell; 2114. Liquid filling port; 22. First electrical connector; 23. Second electrical connector. DETAILED DESCRIPTION

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0037] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] See also Figure 1 、 Figure 2 As shown, an embodiment of the present application provides a battery module, comprising: a liquid cooling bracket 1 and battery groups 2 installed on both sides of the liquid cooling bracket 1 .

[0039] In some embodiments, the liquid cooling bracket 1 is provided with a heat dissipation area (not shown in the figure). In this embodiment, a cooling pipe 113 is provided in the liquid cooling bracket 1, and the area through which the cooling pipe 113 flows forms the heat dissipation area.

[0040] In this embodiment, the first direction is defined as the height direction of the liquid cooling bracket 1 , and the second direction is defined as the width direction of the liquid cooling bracket 1 .

[0041] In some embodiments, the battery group 2 is installed in the heat dissipation area, each of the battery groups 2 includes at least two groups of battery groups 21, and the multiple groups of battery groups 21 are arranged at intervals along the first direction. Each of the battery groups 21 includes at least two battery cells 211, and the multiple battery cells 211 are arranged at intervals along the second direction. In this embodiment, each of the battery groups 2 includes 9 groups of battery groups 21 arranged at intervals along the first direction, each of the battery groups 21 includes 4 battery cells 211 arranged at intervals along the second direction, and each of the battery groups 2 includes 36 battery cells 211. In other embodiments, each of the battery groups 2 can accommodate up to 13 groups of battery groups 21, and each of the battery groups 2 can accommodate up to 52 battery cells 211.

[0042] See also Figure 3 As shown, in some embodiments, the battery cell 211 is vertically installed on the liquid cooling bracket 1, and the battery cell 211 has a positive plate 2111, a negative plate 2112, an electrolytic cell 2113 and a liquid injection port 2114. The positive plate 2111 and the negative plate 2112 are arranged on opposite sides of the battery cell 211 in the second direction, and the positive plate 2111 and the negative plate 2112 are respectively inserted into the bottom of the electrolytic cell 2113, and the liquid injection port 2114 is provided at the top of the positive plate 2111 and / or the negative plate 2112.

[0043] The battery module provided in the embodiment of the present application is configured such that the battery group 2 is respectively arranged on both sides of the liquid cooling bracket 1, so that the liquid cooling plate can dissipate heat for the multiple battery cells 211 in the battery group 2, thereby reducing the heat generated during operation of the battery module and improving the performance and service life of the battery module during operation. At the same time, the battery cells 211 are vertically mounted on the liquid cooling bracket 1, and the positive plate 2111 and the negative plate 2112 are respectively plugged into the bottom of the electrolytic cell 2113. During transportation of the battery module, the positive plate 2111 and the negative plate 2112 are ensured to be in contact with the electrolyte at all times, thereby improving the performance and service life of the battery. In addition, by rationally arranging the layout of the battery cells 211 in the battery group 2 so that they are evenly distributed on both sides of the liquid cooling bracket 1, the energy density of the battery module is improved.

[0044] See also Figure 1 、 Figure 2 As shown, in some embodiments, the liquid cooling bracket 1 includes a vertical plate 11 and a carrier plate 12, and the vertical plate 11 is installed on the carrier plate 12; a heat dissipation area is provided on the vertical plate 11, and the battery group 2 is installed on the vertical plate 11 and is located in the heat dissipation area.

[0045] In this embodiment, a positioning column 121 is further provided on the carrier plate 12. When the battery module is installed in the energy storage system, the positioning column 121 is used to position the liquid cooling bracket 1 at a set position. The positioning column 121 can also limit the displacement of the liquid cooling bracket 1, thereby improving the installation stability of the battery module in the energy storage device.

[0046] The liquid cooling bracket 1 provided in the embodiment of the present application increases the installation stability of the liquid cooling bracket 1 by setting the installation area in the energy storage system through the carrier plate 12.

[0047] See also Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 As shown, in some embodiments, the vertical plate 11 has at least one liquid inlet 111 and at least one liquid outlet 112, a cooling pipe 113 is formed between the liquid inlet 111 and the liquid outlet 112, and the area of ​​the vertical plate 11 corresponding to the area through which the cooling pipe 113 flows forms the heat dissipation area.

[0048] See also Figure 4 As shown, in this embodiment, the vertical plate 11 includes two liquid inlets 111 and two liquid outlets 112, wherein one liquid inlet 111, one liquid outlet 112 and a cooling pipe 113 connected between the liquid inlet 111 and the liquid outlet 112 form a set of heat dissipation modules, and the heat dissipation modules form a heat dissipation area corresponding to the position of the vertical plate 11. The vertical plate 11 includes two sets of heat dissipation modules arranged up and down to form a heat dissipation area that completely covers the vertical plate 11, thereby achieving heat dissipation function for all battery cells 211 installed on the vertical plate 11, improving the density of the battery cells 211 on the vertical plate 11, and further improving the energy density of the battery module.

[0049] See also Figure 4 As shown, in some embodiments, the cooling pipe 113 is bent at least once from the liquid inlet 111 to form a bent portion 1131 and then extends toward the liquid outlet 112. In this embodiment, the cooling pipe 113 is bent and folded back five times to form multiple bent portions 1131, thereby increasing the coverage area of ​​the cooling pipe 113 and increasing the coverage area of ​​the heat dissipation area.

[0050] In this embodiment, since the cooling pipe 113 in this application is bent and folded multiple times, the flow rate of the coolant in the cooling pipe 113 is greatly slowed down. Therefore, no matter whether the coolant can enter from the liquid inlet 111 located at the top and flow out from the liquid outlet 112 located at the bottom, or the coolant enters from the liquid inlet 111 located at the bottom and flows out from the liquid outlet 112 located at the top, it can have a good heat dissipation effect on the battery cell 211.

[0051] See also Figure 5 As shown, in other embodiments, when the number of the cooling pipes 113 is at least two, the plurality of cooling pipes 113 are relatively staggered and distributed from the bending portion 1131 .

[0052] The embodiment of the present application increases the effective contact area between the cooling pipe 113 and the vertical plate 11 and hinders the flow rate of the coolant by bending the cooling pipe 113 multiple times and designing a layout with multiple bending parts 1131 relatively staggered, thereby relatively evenly and efficiently improving the cooling of the battery cell 211 and improving the heat dissipation effect.

[0053] See also Figure 1 、 Figure 2 As shown, in some embodiments, the battery module further includes a first electrical connector 22 , and the two battery packs 21 located on both sides of the liquid cooling bracket 1 and on the same horizontal plane are connected in parallel through the first electrical connector 22 .

[0054] In this embodiment, the positive electrodes of the battery cells 211 of the battery packs 21 installed on both sides of the vertical plate 11 located on the same horizontal plane are connected in parallel through the first electrical connector 22, and the battery packs 21 of two adjacent battery groups 2 are electrically connected in parallel in this manner, thereby realizing the electrical connection of the two battery groups 2 of the same battery module.

[0055] Please continue reading Figure 1 、 Figure 2 As shown, in some embodiments, the battery module also includes a second electrical connector 23, and the two adjacent battery cells 211 in each battery group 21 are connected in series through the second electrical connector 23. In this embodiment, the positive plate 2111 of one battery cell 211 and the negative plate 2112 of another battery cell 211 are connected in series through the second electrical connector 23, and the two adjacent battery cells 211 in the same battery group 21 are electrically connected in series in this way, thereby realizing electrical connection within the same battery group 21.

[0056] In some embodiments, the distance between two adjacent battery cells 211 in each battery pack 21 is 2 mm to 3 mm. Specifically, the distance between two adjacent battery cells 211 can be set to any value of 2 mm, 2.5 mm, 3 mm, or a range between any two values.

[0057] The embodiment of the present application limits the distance between two adjacent battery cells 211, thereby improving the structural compactness of each battery group 21 and maintaining the electrical connection stability between two adjacent battery cells 211. If the distance between two adjacent battery cells 211 is too far, the second electrical connector 23 may be broken due to the shaking of the energy storage system.

[0058] In some embodiments, the spacing between two adjacent battery groups 21 in each battery group 2 is 100 mm to 120 mm. Specifically, the spacing between two adjacent battery groups 21 can be set to any value of 100 mm, 110 mm, 120 mm or a range between any two values.

[0059] In the embodiment of the present application, the spacing between two adjacent battery packs 21 is limited to reserve the aperture of the unloading steel plate to facilitate the installation of the unloading steel plate, and the possibility of battery expansion and deformation is taken into consideration to improve the safety of the battery module.

[0060] In some embodiments, the battery module further includes a thermally conductive connector (not shown in the figure), which is used to mount each of the battery cells 211 on the liquid cooling bracket 1. In this embodiment, the thermally conductive connector can use a thermally conductive structural adhesive, wherein the thermal conductivity coefficient of the thermally conductive connector is 2 to 3.

[0061] The embodiment of the present application increases the structural strength between the battery cell 211 and the liquid cooling bracket 1 by providing a conductive connector, and facilitates the transfer of heat dissipated by the battery cell 211 to the heat dissipation area of ​​the vertical plate 11 for heat transfer, thereby improving the heat dissipation performance.

[0062] See also Figure 6 As shown, based on the battery module described above, an embodiment of the present application further provides an energy storage system, including a box 10 and at least one set of power supply devices 20 , wherein the power supply devices 20 are installed in the box 10 .

[0063] In some embodiments, at least one power supply installation frame is provided in the box body 10 . In this embodiment, the number of the power supply installation frames is consistent with the number of the power supply devices 20 .

[0064] In this embodiment, the length direction, width direction and height direction of the power supply installation frame are further defined: the first direction is defined as the height direction of the liquid cooling bracket 1, and the height direction of the power supply installation frame is set along the first direction; the second direction is defined as the width direction of the liquid cooling bracket 1, and the width direction of the power supply installation frame is set along the second direction; the third direction is defined as perpendicular to the first direction and the second direction, and the length direction of the power supply installation frame is set along the third direction.

[0065] See also Figure 6 As shown, each of the power supply devices 20 is mounted on a corresponding power supply mounting frame. The power supply device 20 includes at least two groups of battery modules as described above, and the multiple groups of battery modules are arranged at intervals along the third direction.

[0066] The embodiment of the present application effectively improves the energy density of the energy storage system by integrating the above-mentioned battery module into the energy storage system, and fixes the power supply device 20 through the power supply mounting frame, thereby improving the structural stability of the power supply device 20.

[0067] In some embodiments, the power supply device 20 further includes a heat insulating member (not shown in the figure), which is installed between two adjacent battery modules.

[0068] In this embodiment, the thermal insulation member is selected from at least one of mica sheets and aerogels.

[0069] In the embodiment of the present application, a heat insulating member is provided between two adjacent battery modules to avoid heat transfer between the two adjacent groups of battery modules, thereby preventing thermal influence between the two groups and preventing the power supply device 20 from heating up seriously.

[0070] Obviously, the embodiments described above are only some of the embodiments of the present application, rather than all of the embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present application.

Claims

1. A battery module, characterized in that: It comprises a liquid cooling bracket (1) and battery groups (2) installed on both sides of the liquid cooling bracket (1); The liquid cooling bracket (1) is provided with a heat dissipation area; The battery group (2) is installed in the heat dissipation area, each of the battery groups (2) includes at least two battery groups (21), and the plurality of battery groups (21) are arranged at intervals along a first direction. Each of the battery groups (21) includes at least two battery cells (211), and the plurality of battery cells (211) are arranged at intervals along a second direction, wherein the first direction is a height direction of the liquid cooling bracket (1), and the second direction is a width direction of the liquid cooling bracket (1); The battery cell (211) is vertically mounted on the liquid cooling support (1), and the battery cell (211) comprises a positive electrode plate (2111), a negative electrode plate (2112), an electrolytic cell (2113) and a liquid injection port (2114). The positive electrode plate (2111) and the negative electrode plate (2112) are arranged on opposite sides of the battery cell (211) in a second direction. The positive electrode plate (2111) and the negative electrode plate (2112) are respectively inserted into the bottom of the electrolytic cell (2113), and the liquid injection port (2114) is provided at the top of the positive electrode plate (2111) and / or the negative electrode plate (2112).

2. The battery module according to claim 1, wherein: The liquid cooling bracket (1) comprises a vertical plate (11) and a carrier plate (12), wherein the vertical plate (11) is mounted on the carrier plate (12); a heat dissipation area is provided on the vertical plate (11), and the battery group (2) is mounted on the vertical plate (11) and is located within the heat dissipation area.

3. The battery module according to claim 2, characterized in that The vertical plate (11) has at least one liquid inlet (111) and at least one liquid outlet (112), a cooling pipeline (113) is formed between the liquid inlet (111) and the liquid outlet (112), and the area of ​​the vertical plate (11) corresponding to the area through which the cooling pipeline (113) flows forms the heat dissipation area.

4. The battery module according to claim 3, characterized in that The cooling pipeline (113) is bent at least once from the liquid inlet (111) to form a bent portion (1131) and then extends toward the liquid outlet (112).

5. The battery module according to claim 4, characterized in that: The number of the cooling pipes (113) is at least two, and the plurality of cooling pipes (113) are relatively staggered and distributed from the bending portion (1131).

6. The battery module according to claim 1, characterized in that The battery module further comprises a first electrical connector (22), and the two battery packs (21) located on both sides of the liquid cooling bracket (1) and on the same horizontal plane are connected in parallel via the first electrical connector (22); and / or The battery module further includes a second electrical connector (23), and two adjacent battery cells (211) in each battery pack (21) are connected in series via the second electrical connector (23).

7. The battery module according to claim 6, characterized in that The distance between two adjacent battery cells (211) in each battery pack (21) is 2 mm to 3 mm; and / or The distance between two adjacent battery packs (21) in each battery group (2) is 100 mm to 120 mm.

8. The battery module according to claim 1, wherein: The battery module further comprises a heat-conducting connector, which is used to mount each battery cell (211) on the liquid cooling bracket (1).

9. The battery module according to claim 8, characterized in that: The thermal conductivity of the thermally conductive connecting piece is 2-3.

10. An energy storage system, characterized in that: It comprises a box (10) and at least one set of power supply devices (20), wherein the power supply devices (20) are installed in the box (10); At least one power supply mounting frame is provided in the box (10), and the number of the power supply mounting frames is consistent with the number of the power supply devices (20), wherein the height direction of the power supply mounting frame is arranged along a first direction, the width direction of the power supply mounting frame is arranged along a second direction, and the length direction of the power supply mounting frame is arranged along a third direction, and the third direction is perpendicular to the first direction and the second direction; The power supply device (20) is mounted on a corresponding power supply mounting frame, and the power supply device (20) comprises at least two groups of battery modules according to any one of claims 1 to 9, wherein the plurality of groups of battery modules are spaced apart along a third direction.

11. The energy storage system according to claim 10, characterized in that: The power supply device (20) further includes a heat insulating member, which is installed between two adjacent battery modules.

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