Integrated liquid-cooled battery pack and energy storage cabinet

Abstract

The utility model relates to the technical field of energy storage batteries, in particular to an integrated liquid-cooled battery pack, which comprises a box body, a liquid-cooled plate and battery modules, a plurality of battery modules are integrated, and a plurality of battery cells in the battery modules are transversely arranged to form a transversely expanded integrated battery pack structure. The integrated level of a battery system can be effectively improved, compared with a traditional battery pack structure, in energy storage equipment of the same specification, the use number of battery packs and the application number of accessory connecting pieces such as connecting cables and copper bars can be reduced, direct-current loss is reduced, the system efficiency is improved, meanwhile, the manufacturing efficiency of the battery packs is improved, and the energy storage efficiency is improved. And the manufacturing cost of the battery pack is reduced. Meanwhile, the utility model further provides an energy storage cabinet which adopts the integrated liquid cooling bag, so that the number of battery packs can be reduced, series cables, copper bars and other electric connection parts between the battery packs are reduced, the direct current loss is reduced, and the system efficiency is improved; the production and manufacturing efficiency is improved and the cost is reduced due to high integration.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and in particular to an integrated liquid-cooled battery pack and an energy storage cabinet. Background Art

[0002] Now, due to the high cooling performance of liquid cooling, the battery cell temperature can be controlled within an appropriate range in a shorter time. More and more technical solutions tend to use liquid cooling for cooling. Currently, most liquid-cooled battery packs are grouped in a form of 48 in series and 1 in parallel or 52 in series and 1 in parallel. When integrated into an energy storage cabinet or container, 4 to 5 liquid cooling packs are usually required to form a battery cluster. This method results in a large number of battery packs. The subsequent problem is that there are a large number of cables and copper bars connected in series between the battery packs, which will lead to more unnecessary DC heat loss and low system efficiency. The application of industrial and commercial energy storage or large-scale energy storage is currently limited. At the same time, this grouping method of connecting multiple packs in series will lead to high system costs and low manufacturing efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide an integrated liquid-cooled battery pack and energy storage cabinet to solve the prior art problems existing in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0005] On the one hand, the present application provides an integrated liquid-cooled battery pack, including a box body, a liquid cooling plate and a battery module, wherein the liquid cooling plate is arranged at the bottom and the top of the box body, and a cooling liquid flow channel is arranged in the liquid cooling plate. The battery module is arranged in the box body and at least two groups are arranged, and the battery modules are evenly arranged along the length direction of the box body. The battery module includes a plurality of battery cells, and the battery cells are arranged in two rows in parallel.

[0006] Based on the above technical solution, the battery cells are grouped in 26 series and one parallel or 24 series and one parallel.

[0007] Based on the above technical solution, the battery modules are arranged into 5 groups, and the battery cells are grouped into 26 in series and one in parallel.

[0008] On the basis of the above technical solution, a fire valve, an explosion-proof valve, a BMS maintenance panel, an MSD, a communication connector and a power connector are also provided on the side wall of the box.

[0009] Based on the above technical solution, the battery module further includes end plates and binding steel strips. The end plates are symmetrically arranged on both sides of the battery core and fixed by the binding steel strips.

[0010] Based on the above technical solution, the battery module also includes a voltage and temperature acquisition board, a copper busbar and a BMS. The voltage and temperature acquisition board is laid on the top of the battery cell, the copper busbar is electrically connected to the battery cell, and the BMS is electrically connected to the voltage and temperature acquisition board.

[0011] Based on the above technical solution, the liquid cooling plate includes a liquid cooling bottom plate arranged at the bottom end of the box body and a liquid cooling top plate arranged at the top end of the box body, and the liquid cooling top plate is integrally formed with the upper cover of the box body.

[0012] On the other hand, the present application also provides an energy storage cabinet, including the above-mentioned integrated liquid-cooled battery pack.

[0013] Based on the above technical solution, the liquid-cooled battery pack is provided with two groups and is arranged in series.

[0014] The beneficial effects of the technical solution provided by the utility model are:

[0015] 1. The utility model provides an integrated liquid-cooled battery pack, which integrates multiple battery modules, and multiple battery cells in the battery modules are arranged in a horizontal arrangement to form a laterally expanded integrated battery pack structure, which can effectively improve the integration of the battery system. Compared with the traditional battery pack structure, in energy storage devices of the same specifications, the number of battery packs used and the number of auxiliary links such as connecting cables and copper busbars can be reduced, DC losses can be reduced, system efficiency can be improved, and at the same time, the manufacturing efficiency of the battery pack can be improved and the manufacturing cost of the battery pack can be reduced.

[0016] 2. The above-mentioned integrated liquid-cooled battery pack is applied to industrial and commercial energy storage cabinets, which have a more optimized length-to-width ratio. Under the same specifications, the number of battery packs can be reduced, and the number of electrical connection components such as series cables and copper bars between battery packs can be reduced, thereby reducing DC losses and improving system efficiency. At the same time, in terms of manufacturing, high integration improves production efficiency and reduces costs. Specifically, DC losses are reduced by more than 10%, system efficiency is increased by more than 1%, and manufacturing efficiency is increased by more than 40%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure after removing the upper cover of the box body in the utility model;

[0019] Figure 3 It is a top view of the utility model after removing the upper cover of the box body;

[0020] Figure 4 It is a structural schematic diagram of the battery module in the utility model; DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figures 1 to 4 As shown, this embodiment provides an integrated liquid-cooled battery pack, including a box body 1, a liquid cooling plate and a battery module 2, wherein the liquid cooling plate is arranged at the bottom and the top of the box body 1, and a cooling liquid flow channel is arranged in the liquid cooling plate. The battery module 2 is arranged in the box body 1 and at least two groups are arranged, and the battery modules 2 are evenly arranged along the length direction of the box body 1. The battery module 2 includes a plurality of battery cells 21, and the battery cells 21 are arranged in two rows in parallel.

[0025] Based on the above technical solution, the battery cells 21 are grouped in 26 series and one parallel or 24 series and one parallel.

[0026] The utility model provides an integrated liquid-cooled battery pack, which integrates multiple battery modules 2, and multiple battery cells 21 in the battery module 2 are arranged in a horizontal manner to form a laterally expanded integrated battery pack structure, which can effectively improve the integration of the battery system. Compared with the traditional battery pack structure, in energy storage devices of the same specifications, the number of battery packs used and the number of auxiliary links such as connecting cables and copper busbars can be reduced, DC losses can be reduced, system efficiency can be improved, and at the same time, the manufacturing efficiency of the battery pack can be improved, and the manufacturing cost of the battery pack can be reduced.

[0027] Specifically, the liquid cooling plate is used to provide a constant low temperature environment, provide efficient cooling performance for the battery cells, and is arranged at both ends of the battery module 2 to achieve multi-faceted cooling, so as to avoid a large temperature difference between the battery cells at the top and bottom of the battery module 2, which affects the service life of the battery pack. The battery cells 21 in the battery module 2 are used to store energy. In a preferred embodiment, the battery cells 21 of the battery module 2 in the liquid-cooled battery pack provided by the present application are arranged in two rows, such as a 26-in-one structure of battery cells 21, that is, 13 battery cells are arranged in a single row, and two rows form a 26-in-one grouping mode; such a horizontally expanded battery module 2 form can make the liquid cooling plates respectively arranged on the upper and lower sides of the box 1 more evenly distributed, and the cooling effect is good; at the same time, it is also easier to process and manufacture, and the battery pack has a more optimized length-to-width ratio, which is more in line with the applicability of the battery pack in the current industrial and commercial energy storage cabinet.

[0028] Based on the above technical solution, the battery modules 2 are set to 5 groups, and the battery cells 21 are grouped in a manner of 26 in series and one in parallel.

[0029] As shown in the figure, in a preferred embodiment, the integrated liquid-cooled battery pack includes 5 battery modules 2, and the battery cells 21 in each battery module 2 are grouped in a manner of 26 in series and parallel. The battery modules 2 are creatively expanded from the original 12 in series and 1 in parallel or 13 in series and 1 in parallel to the grouping manner of 26 in series and 1 in parallel, and the original 48 in series and 1 in parallel or 52 in series and 1 in parallel in the entire liquid-cooled battery pack are expanded to 130 in series and 1 in parallel, so as to adapt to the existing industrial and commercial energy storage and large-scale energy storage applications. As mentioned above, the grouping manner of the battery cells 21 can be 26 in series and parallel or 24 in series and parallel, etc., and the number of battery modules 2 in the battery pack is not limited to 5 groups, and can be a combination of 2 groups, 3 groups, 4 groups, etc., and the composition manner is more flexible and diverse, and the scope of application is wider.

[0030] On the basis of the above technical solution, a fire valve 11, an explosion-proof valve 12, a BMS maintenance panel 13, an MSD 14, a communication connector 15 and a power connector 16 are further provided on the side wall of the box body 1.

[0031] Specifically, the fire valve 11 provided on the battery pack box 1 is used to release fire-fighting agents to promptly extinguish fire-fighting agents when a fire or other safety accident occurs in the battery pack; the explosion-proof valve 12 is used to quickly release the pressure through the explosion-proof valve when the internal air pressure is too high when the battery cell has thermal runaway, so as to avoid greater safety hazards such as explosion; the BMS maintenance board 13 is used to maintain and replace the BMS components in the battery module; the MSD 14 is a maintenance switch, which can quickly cut off the power in the event of a short circuit outside the battery pack to prevent the battery cell from thermal runaway due to the short circuit; the communication connector 15 is used to realize the communication between BMS and the outside; the power connector 16 is used to realize the power output of the battery pack. BMS refers to the battery management system, which is used to monitor and manage the working status of the battery module.

[0032] On the basis of the above technical solution, the battery module 2 further includes an end plate 22 and a strapping steel belt 23, and the end plate 22 is symmetrically arranged on both sides of the battery cell 21 and fixed by the strapping steel belt 23. Preferably, the end plate 22 in the battery module 2 is made of aluminum, arranged on both sides of the battery cell 21, and used to squeeze and fix the battery cell assembly; at the same time, a strapping steel belt 23 is provided to strap and fix the battery cell 21 to provide a pre-tightening force.

[0033] On the basis of the above technical solution, the battery module 2 also includes a voltage and temperature acquisition board 24, a copper busbar 25 and a BMS 26. The voltage and temperature acquisition board 24 is laid on the top of the battery cell 21, the copper busbar 25 is electrically connected to the battery cell 21, and the BMS 26 is electrically connected to the voltage and temperature acquisition board 24. Specifically, as shown in the figure, a voltage and temperature acquisition board 24 is provided at the top of the battery cell 21 in the battery module 2, which is used to collect the voltage and temperature of the battery cell during operation, monitor the operating status of the battery module in time, and ensure the operating stability of the battery pack; the copper busbar 25 is used for the power output of the battery pack and is connected to the power connector 16; the BMS 26 is a battery management system, which is used to monitor and manage the working status of the battery module 2.

[0034] On the basis of the above technical solution, the liquid cooling plate includes a liquid cooling bottom plate 3 arranged at the bottom of the box body 1 and a liquid cooling top plate arranged at the top of the box body 1, and the liquid cooling top plate is integrally formed with the box body cover 4. By providing a liquid cooling bottom plate 3 at the bottom of the box body 1 and a liquid cooling top plate at the top, simultaneous cooling and heat exchange of both ends of the battery module 2 can be achieved, reducing the temperature difference between the top and bottom of the battery cell body, and ensuring the service life of the battery pack. In a preferred embodiment, by providing a box body cover 4, the battery cell can be isolated from the external environment, reducing the influence of the ambient temperature on the battery cell temperature, and ensuring the operating stability of the battery pack.

[0035] This embodiment also provides an energy storage cabinet, including the above-mentioned integrated liquid-cooled battery pack.

[0036] Based on the above technical solution, the liquid-cooled battery pack is provided with two groups and is arranged in series.

[0037] In a preferred embodiment, an integrated liquid-cooled battery pack proposed in the present application can be applied to industrial and commercial energy storage cabinets, which has a more optimized length-to-width ratio, forming a series connection scheme of two 130 series and one parallel battery packs. Under the same specifications, the current traditional form of five 52 series and one parallel battery packs is changed, that is, the number of battery packs is reduced from 5 to 2, and the electrical connection components such as series cables and copper busbars between battery packs are reduced, thereby reducing DC losses and improving system efficiency. At the same time, in terms of manufacturing, high integration improves production efficiency and reduces costs. Specifically, DC losses are reduced by more than 10%, system efficiency is increased by more than 1%, and manufacturing efficiency is increased by more than 40%.

[0038] The basic principle and main features of the utility model are shown and described above. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the appended claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An integrated liquid-cooled battery pack, characterized in that: The invention comprises a box (1), a liquid cooling plate and a battery module (2); the box (1) is also provided with a fire valve (11), an explosion-proof valve (12), a BMS maintenance panel (13), an MSD (14), a communication connector (15) and a power connector (16); the liquid cooling plate is arranged at the bottom and top of the box (1); a cooling liquid flow channel is arranged in the liquid cooling plate; the battery module (2) is arranged in the box (1) and at least two groups are arranged; the battery module (2) is arranged along the The box (1) is evenly arranged in the longitudinal direction, the battery module (2) comprises a plurality of battery cells (21), and the battery cells (21) are arranged in two rows in parallel; the battery module (2) further comprises a voltage and temperature collection board (24), a copper busbar (25), and a BMS (26), the voltage and temperature collection board (24) is laid on the top of the battery cell (21), the copper busbar (25) is electrically connected to the battery cell (21), and the BMS (26) is electrically connected to the voltage and temperature collection board (24).

2. The integrated liquid-cooled battery pack according to claim 1, characterized in that: The battery cells (21) are grouped in a manner of 26 in series and one in parallel or 24 in series and one in parallel.

3. The integrated liquid-cooled battery pack according to claim 1, characterized in that: The battery modules (2) are arranged in five groups, and the battery cells (21) are grouped in a manner of 26 in series and one in parallel.

4. The integrated liquid-cooled battery pack according to claim 1, characterized in that: The battery module (2) further comprises an end plate (22) and a binding steel belt (23); the end plate (22) is symmetrically arranged on both sides of the battery cell (21) and is fixed by the binding steel belt (23).

5. The integrated liquid-cooled battery pack according to claim 1, characterized in that: The liquid cooling plate comprises a liquid cooling bottom plate (3) arranged at the bottom end of the box body (1) and a liquid cooling top plate arranged at the top end of the box body (1); the liquid cooling top plate and the box body upper cover (4) are integrally formed.

6. An energy storage cabinet, characterized in that: An integrated liquid-cooled battery pack comprising any one of claims 1 to 5.

7. An energy storage cabinet according to claim 6, characterized in that: The liquid-cooled battery packs are provided in two groups and are arranged in series.

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