Immersed battery pack and energy storage device

Abstract

The utility model provides an immersed battery pack. The immersed battery pack comprises a battery box body, a plurality of battery cells arranged in the battery box body, immersion liquid which is arranged in the battery box body and is used for immersing the battery cells, a plurality of direct-cooling heat exchange plates arranged in the battery box body, a liquid inlet pipe communicated with the plurality of direct-cooling heat exchange plates, and a liquid outlet pipe communicated with the plurality of direct-cooling heat exchange plates, each battery cell is provided with a top end provided with an electrode and a bottom end opposite to one side of the upper end, the plurality of battery cells are divided into an upper side and a lower side, the top ends of the battery cells on the upper layer face upwards, and the top ends of the battery cells on the lower layer face downwards. According to the immersed battery pack and the energy storage device disclosed by the utility model, the direct-cooling heat exchange plate and the static immersion liquid are used for exchanging heat, so that the effect of cooling the battery cell is realized, the system integration difficulty is greatly reduced, and meanwhile, the problems of large flow resistance, leakage, increase of auxiliary power consumption of the system and the like are solved; and the effect of uniform heat dissipation of the battery cell can also be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to an immersed battery pack and energy storage device. BACKGROUND

[0002] At present, the heat management mode of the energy storage system is air cooling or liquid cooling, and the inconsistent temperature of different regions of the single cell has an influence on the activity of the cell. At present, the immersed cooling mode is mostly used for heat exchange by self-circulation or external pump and radiator. Due to the large viscosity of the immersion liquid, the flow resistance is large in use, the internal pressure of the system is large, and leakage problems occur in long-time operation.

[0003] Therefore, it is necessary to improve the existing immersed battery pack to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a kind of immersed battery pack, to solve the problem of the flow resistance of the immersion liquid of the immersed cooling mode of existing immersion, easy to leak.

[0005] To achieve the above object, the immersed battery pack of the utility model includes battery box, a plurality of cells arranged in the battery box, immersion liquid arranged in the battery box and immersed in the cell, a plurality of direct-cooling heat exchange plates arranged in the battery box, liquid inlet pipe connected with a plurality of direct-cooling heat exchange plates, liquid outlet pipe connected with a plurality of direct-cooling heat exchange plates, the cell has top end with electrode, bottom end opposite to upper end side, a plurality of cells are divided into upper and lower sides, and the top end of the cell in upper layer is upward, and the top end of the cell in lower layer is downward.

[0006] As a further improvement of the utility model, the liquid inlet pipe includes liquid inlet, the liquid outlet pipe includes liquid outlet, and the liquid inlet and the liquid outlet are located outside the battery box.

[0007] As a further improvement of the utility model, the immersed battery pack further includes a fixing plate arranged between the cell in upper layer and the cell in lower layer.

[0008] As a further improvement of the utility model, the cell is divided into multiple columns along horizontal direction, and a plurality of direct-cooling heat exchange plates are arranged between adjacent two columns of cells or between cell and battery box.

[0009] As a further improvement of the utility model, both ends of each column of cells are provided with end plate, and the lower end of each column of cells is provided with support foam.

[0010] As a further improvement of the utility model, the bottom of the battery box is provided with equipment forklift hole.

[0011] The utility model also provides a kind of energy storage device, the energy storage device includes the immersion battery pack as described above, inverter and to communicate liquid inlet pipe and liquid outlet pipe refrigeration system.

[0012] As a further improvement of the utility model, the refrigeration system comprises a refrigeration indoor unit, a refrigeration outdoor unit, a liquid inlet outer pipe and a liquid outlet outer pipe.

[0013] As a further improvement of the utility model, the refrigeration system further comprises a liquid storage tank arranged below the immersion battery pack and the inverter, and the liquid storage tank is in communication with the refrigeration indoor unit.

[0014] As a further improvement of the utility model, the plurality of immersion battery packs are divided into two rows, and the number of inverters is multiple, and the inverters are arranged between the two rows of immersion battery packs, and each inverter is connected to the immersion battery packs on both sides through a copper bar.

[0015] The immersion battery pack and the energy storage device of the utility model utilize the direct cooling heat exchange plate to exchange heat with the static immersion liquid, realize the effect of cooling the battery cell, greatly reduce the system integration difficulty, avoid the problems of large flow resistance and leakage, and further cause the problems of increased system auxiliary power consumption, and can also realize the effect of uniformly cooling the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the energy storage device of the utility model;

[0017] Figure 2 is a structural schematic view of the immersion battery pack of the utility model;

[0018] Figure 3 is a structural schematic view of the immersion battery pack without battery box of the utility model;

[0019] Figure 4 is Figure 3 is a structural schematic view from another angle;

[0020] Figure 5 is a structural schematic view of the immersion battery pack without battery box and battery cell of the utility model. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] As shown in Figures 1 to 5 The energy storage device 100 of the present application comprises an immersed battery pack 1, an inverter 2, and a refrigeration system 3 for connecting the liquid inlet pipe 14 and the liquid outlet pipe 15, and a container.

[0025] A plurality of the immersed battery pack 1 is divided into two rows, the number of the inverter 2 is multiple, and is arranged between the two rows of the immersed battery pack 1, each inverter 2 is connected with the immersed battery pack 1 on both sides through a copper bar 21.

[0026] The refrigeration system 3 comprises a refrigeration indoor unit 31, a refrigeration outdoor unit 32, a liquid inlet outer pipe 33, a liquid outlet outer pipe 34, a condenser, a liquid storage tank 35 arranged below the immersed battery pack 1 and the inverter 2, and the liquid storage tank 35 is communicated with the immersed battery pack 1.

[0027] The refrigeration indoor unit 31 comprises a compressor, an expansion valve, a temperature acquisition unit and the like, so as to provide refrigerant power for the immersed battery pack 1.

[0028] The container is used to accommodate the immersion battery pack 1, the inverter 2 and the refrigeration system 3, further, the condenser is arranged on the side wall of the container, and adjacent to the refrigeration outdoor unit 32. At the same time, the container has a certain heat preservation effect.

[0029] The condenser is connected with the refrigeration indoor unit 31 through a pipeline.

[0030] The refrigeration outdoor unit 32 includes heat dissipation fins arranged adjacent to the condenser, a heat dissipation fan blowing towards the heat dissipation fins, and the heat dissipation fan is located between the heat dissipation fins and the immersion battery pack 1. The heat dissipation fan is not necessarily turned on, if the ambient temperature is low, the heat dissipation fins can use natural cooling for heat exchange. When the temperature of the battery cell 12 reaches a certain threshold value, the heat dissipation fan can be turned on, and the operating frequency of the heat dissipation fan is increased in stages to meet the system heat dissipation requirement.

[0031] The immersion battery pack 1 includes a battery box 11, a plurality of battery cells 12 arranged in the battery box 11, an immersion liquid arranged in the battery box 11 and immersed in the battery cells 12, a plurality of direct cooling heat exchange plates 13 arranged in the battery box 11, a liquid inlet pipe 14 communicating with the plurality of direct cooling heat exchange plates 13, a liquid outlet pipe 15 communicating with the plurality of direct cooling heat exchange plates 13, and a fixing plate 16.

[0032] The bottom of the battery box 11 is provided with a forklift hole 111 for the forklift to hold the immersion battery pack 1.

[0033] The battery cell 12 has a top end provided with an electrode, a bottom end opposite to the top end, a plurality of battery cells 12 are divided into upper and lower sides, and the top ends of the battery cells 12 in the upper layer are upward, the top ends of the battery cells 12 in the lower layer are downward, and the battery cells 12 in the upper layer and the battery cells 12 in the lower layer are arranged one by one. In this embodiment, the immersion battery pack 1 is directly clustered by the battery cells 12, which greatly reduces the PACK level material and reduces the system cost.

[0034] The battery cell 12 is divided into a plurality of columns in the horizontal direction, and a plurality of direct cooling heat exchange plates 13 are arranged between adjacent two columns of battery cells 12 or between the battery cell 12 and the battery box 11.

[0035] Both ends of each column of battery cells 12 are provided with an end plate 121, and the lower end of each column of battery cells 12 is provided with a supporting foam 122.

[0036] The fixing plate 16 is arranged between the battery cells 12 in the upper layer and the battery cells 12 in the lower layer. All battery cells 12 are tightly held by steel belts, fixed by the end plate 121 and the battery box 11, and the supporting foam 122 cooperates to fix the battery cells 12 at the bottom.

[0037] The immersion liquid is a non-combustible liquid, fully covers the battery cell 12, can exchange heat with the battery cell 12, and can achieve uniform heat dissipation, and the heat of the battery cell 12 can be transmitted to the immersion liquid.

[0038] The direct cooling heat exchange plate 13 is also immersed in the immersion liquid to exchange heat with the immersion liquid. In the embodiment, the immersion liquid can achieve cooling of the battery cell 12 without flowing, which reduces the integration difficulty and can isolate oxygen and inhibit the spread of thermal runaway.

[0039] The liquid inlet pipe 14 includes a liquid inlet 141, and the liquid outlet pipe 15 includes a liquid outlet 151, and the liquid inlet 141 and the liquid outlet 151 are located outside the battery box 11.

[0040] The liquid inlet outer pipe 33 is connected to the liquid inlet pipe 14 of the plurality of immersion battery packs 1 and the refrigeration indoor unit 31, and the liquid outlet outer pipe 34 is connected to the liquid outlet pipe 15 of the plurality of immersion battery packs 1 and the refrigeration indoor unit 31.

[0041] After the refrigerant is cooled by the refrigeration indoor unit 31, it enters the liquid inlet pipe 14 through the liquid inlet 141 from the liquid inlet outer pipe 33, and enters the direct cooling heat exchange plate 13, exchanges heat with the immersion liquid, and then is discharged to the liquid outlet outer pipe 34 through the liquid outlet pipe 15 and enters the refrigeration indoor unit 31 for refrigeration. The heat generated by the refrigeration indoor unit 31 is discharged outside the container through the refrigeration outdoor unit 32 and the condenser.

[0042] When the battery cell 12 experiences thermal runaway, the temperature acquisition unit monitors the rapid drop in the liquid temperature of the direct cooling heat exchange plate 13, increases the heat exchange efficiency with the immersion liquid, reduces the temperature of the immersion liquid, and avoids the spread of heat from the runaway battery cell 12. At the same time, the immersion liquid has the effect of isolating oxygen, and can enter the internal explosion-proof valve of the battery cell 12 to inhibit internal short circuit, and can also prevent the battery cell 12 from spraying substances to avoid causing secondary short circuit.

[0043] The immersion battery pack 1 and the energy storage device 100 of the utility model utilize the direct cooling heat exchange plate 13 to exchange heat with the static immersion liquid, achieve the effect of cooling the battery cell 12, greatly reduce the system integration difficulty, avoid the problems of large flow resistance and leakage, and further cause the problems of increased auxiliary power consumption of the system, and can also achieve the effect of uniform heat dissipation of the battery cell 12.

[0044] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0045] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. An immersion battery pack, characterized by: The submerged battery pack comprises a battery box, a plurality of battery cells arranged in the battery box, a submerged liquid arranged in the battery box and submerging the battery cells, a plurality of direct-cooling heat exchange plates arranged in the battery box, a liquid inlet pipe communicating with the plurality of direct-cooling heat exchange plates, and a liquid outlet pipe communicating with the plurality of direct-cooling heat exchange plates. The battery cells have top ends provided with electrodes and bottom ends opposite to the top ends. The plurality of battery cells are divided into upper and lower sides, and the top ends of the battery cells in the upper layer are upward, and the top ends of the battery cells in the lower layer are downward.

2. The submerged battery pack of claim 1, wherein: The liquid inlet pipe comprises a liquid inlet, and the liquid outlet pipe comprises a liquid outlet. The liquid inlet and the liquid outlet are located outside the battery box.

3. The submerged battery pack of claim 1, wherein: The submerged battery pack further comprises a fixing plate arranged between the battery cells in the upper layer and the battery cells in the lower layer.

4. The submerged battery pack of claim 1, wherein: The battery cells are divided into a plurality of columns in the horizontal direction, and the plurality of direct-cooling heat exchange plates are arranged between adjacent two columns of battery cells or between the battery cells and the battery box.

5. The submerged battery pack of claim 4, wherein: Both ends of each column of battery cells are provided with end plates, and the lower end of each column of battery cells is provided with a support foam.

6. The submerged battery pack of claim 1, wherein: The bottom of the battery box is provided with a forklift hole.

7. An energy storage device, characterized by: The energy storage device comprises the submerged battery pack, the inverter, and a refrigeration system for communicating the liquid inlet pipe and the liquid outlet pipe.

8. The energy storage device of claim 7, wherein: The refrigeration system comprises a refrigeration indoor unit, a refrigeration outdoor unit, a liquid inlet outdoor pipe, and a liquid outlet outdoor pipe. The liquid inlet outdoor pipe communicates the liquid inlet pipes of the plurality of submerged battery packs and the refrigeration indoor unit, and the liquid outlet outdoor pipe communicates the liquid outlet pipes of the plurality of submerged battery packs and the refrigeration indoor unit.

9. The energy storage device of claim 8, wherein: The refrigeration system further comprises a liquid storage tank arranged below the submerged battery pack and the inverter. The liquid storage tank communicates with the refrigeration indoor unit.

10. The energy storage device of claim 7, wherein: The plurality of submerged battery packs are divided into two columns, and the number of inverters is a plurality. Each inverter is connected to the submerged battery packs on both sides through a copper bar.

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