Immersed battery pack
By setting diagonally distributed liquid injection ports and liquid outlets on the bottom cover of the immersed battery pack, the problem of uneven battery temperature caused by the long flow distance of the coolant is solved, and more efficient battery cooling is achieved.
Patent Information
- Application Number
- CN202420806955.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The existing immersion battery module cannot be removed in time under high temperature conditions, resulting in excessive pressure in the module and reduced temperature control effect, and the long flow distance of the coolant leads to uneven temperature of the battery cell.
An immersion battery pack is designed, and the liquid injection port and the liquid outlet of the insulating coolant are respectively arranged on the opposite first side plate and the second side plate of the bottom cover, and the liquid injection port and the liquid outlet are distributed diagonally to shorten the flow distance of the coolant.
It effectively prevents uneven temperatures of the battery cells on both sides of the module, ensures that all coolants can fully dissipate heat to the battery cells cluster, and improves the cooling efficiency of the immersed battery pack.
Smart Images
Figure CN222581211U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium ion batteries, in particular to an immersion type battery pack. Background Art
[0002] At present, the current immersion battery modules can be divided into two categories according to the cooling form: static cooling type and circulating cooling type. Among them, the static cooling immersion module has limited cooling capacity; when the battery cell is continuously charged and discharged and is in a high temperature state for a long time, the heat of the insulating coolant will not be removed in time, and the insulating coolant in the module will evaporate quickly or the pressure in the module will be too high. In this state, not only will the safety risk of the module increase, but when the insulating coolant cannot be replenished in time, the temperature control effect of the module will also be greatly reduced.
[0003] The cooling efficiency of the circulating cooling immersion module is significantly higher than that of the static cooling module because the insulating coolant can continuously flow and circulate in the cooling pipes and modules. However, the cooling efficiency of this type of immersion module is largely related to the flow channel. In the immersion module in the prior art, the inlet and outlet of the insulating coolant are both on the end plate on the same side of the module; after the coolant passes through the liquid inlet, it flows around the battery cell cluster along the guide groove designed on the inner wall of the module shell; this causes the insulating coolant to flow a long distance, which can easily cause uneven temperatures of the battery cells on both sides of the module. In addition, when there is a gap between the flow channel and the battery cell, part of the liquid may flow directly from the liquid inlet to the liquid outlet without fully cooling the battery cell, resulting in reduced cooling efficiency. Utility Model Content
[0004] The purpose of the utility model is to provide an immersion type battery pack, so that the flow distance of the coolant in the accommodating cavity is shortened, the temperature of the battery cells on both sides of the module is prevented from being uneven, the heat dissipation of the battery cell cluster by all insulating coolants is ensured, and the cooling efficiency of the immersion type battery pack is ensured.
[0005] In order to achieve the above object, the utility model provides an immersion type battery pack, comprising:
[0006] Top cover;
[0007] A bottom cover, a receiving cavity is formed between the bottom cover and the top cover, a battery cell cluster is installed in the receiving cavity, the bottom cover includes a first side plate and a second side plate which are arranged opposite to each other, the first side plate is provided with a liquid injection port for insulating coolant, the second side plate is provided with a liquid outlet, the projection of the liquid injection port on the second side plate and the liquid outlet are distributed diagonally on the second side plate.
[0008] Compared with the prior art, the utility model embodiment of an immersion type battery pack has the following beneficial effects: a receiving cavity for receiving a cell cluster is formed between the bottom cover and the top cover, and an insulating coolant is filled in the receiving cavity for cooling the cell cluster. The first side plate and the second side plate opposite to the bottom cover are respectively provided with an injection port and an outlet port for the insulating coolant, and the insulating coolant enters the receiving cavity through the injection port to cool the cell cluster and then is discharged through the outlet port. The projection of the injection port on the second side plate and the outlet port are diagonally distributed on the second side plate, that is, the injection port and the outlet port are respectively arranged at the farthest corners between the first side plate and the second side plate. Compared with the arrangement of arranging the outlet port and the injection port on the same side plate, the cooling effect on the cell cluster is ensured while shortening the flow distance of the coolant in the receiving cavity, preventing uneven temperature of the cells on both sides of the module from affecting the battery performance; and all the insulating coolants will reach the outlet port after passing through the cell cluster, ensuring that all the insulating coolants dissipate enough heat to the cell cluster, and ensuring the cooling efficiency of the immersion battery pack.
[0009] In the submerged battery pack of the embodiment of the utility model, the liquid filling port is arranged at a corner of the first side plate away from the top cover, and the liquid outlet is arranged at a corner of the bottom plate of the second side plate close to the bottom cover.
[0010] In the submerged battery pack of the embodiment of the utility model, a plurality of liquid injection ports are arranged on the first side plate, a plurality of liquid outlets are arranged on the second side plate, and the positions of the plurality of liquid outlets and the plurality of liquid injection ports are also distributed diagonally.
[0011] In the submerged battery pack of the embodiment of the utility model, a guide groove plate is arranged in the accommodating cavity, and the guide groove plate is distributed around the battery cell cluster. After the insulating coolant enters the liquid injection port, it is guided to the liquid outlet through the guide groove plate.
[0012] In the submerged battery pack of the embodiment of the utility model, the battery cell cluster includes a plurality of battery cell shells arranged at intervals, and the guide channel plate is arranged between the battery cell shells.
[0013] In the submerged battery pack of the embodiment of the utility model, a pressure relief valve is arranged on the top cover, and the pressure relief valve is connected to the accommodating cavity.
[0014] In the submerged battery pack of the embodiment of the utility model, the top cover is provided with a pressure sensor hole for fixing the pressure sensor facing the accommodating cavity.
[0015] In the submerged battery pack of the embodiment of the utility model, a low-voltage wiring harness port is provided on the first side panel, the battery cell cluster includes a voltage collection circuit, and the low-voltage wiring harness port is connected to the voltage collection circuit.
[0016] In the immersed battery pack of the embodiment of the utility model, a total negative electrode output terminal is arranged on the first side plate, a total positive electrode output terminal is arranged on the second side plate, the battery cell cluster includes a total positive electrode bar and a total negative electrode bar, the total negative electrode output terminal is connected to the total negative electrode bar, and the total positive electrode output terminal is connected to the total positive electrode bar.
[0017] In the submerged battery pack of the embodiment of the utility model, a third side plate is connected between the first side plate and the second side plate, and a plurality of detachable handles are provided on the third side plate.
[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the external structure of the submerged battery pack of an embodiment of the utility model;
[0020] Figure 2 It is a schematic diagram of the internal structure of the submerged battery pack according to an embodiment of the utility model;
[0021] In the figure, 1. top cover; 11. pressure relief valve; 12. pressure sensor hole; 2. bottom cover; 21. first side panel; 22. second side panel; 23. liquid filling port; 24. liquid outlet; 25. guide trough plate; 26. low-voltage wiring harness port; 27. total negative output terminal; 28. total positive output terminal; 29. handle; 3. battery cell cluster. DETAILED DESCRIPTION
[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0023] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0024] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0026] like Figure 1 and Figure 2 As shown, an immersion battery pack of a preferred embodiment of the utility model includes: a top cover 1 and a bottom cover 2, the top cover 1 is set in a plate shape; the bottom cover 2 is composed of a side plate and a bottom plate, a sealed accommodating cavity is formed between the bottom cover 2 and the top cover 1, and the top cover 1 and the bottom cover 2 can be connected by laser welding edges and a combination of gluing to achieve the effect of sealing the inner cavity; a battery cell cluster 3 is installed in the accommodating cavity, and the accommodating cavity is filled with an insulating coolant so that the battery cell cluster 3 is fully immersed in the insulating coolant. The coolant can be an insulating liquid such as a lubricating liquid or a fluorinated liquid; the bottom cover 2 includes a first side plate 21 and a second side plate 22 that are arranged opposite to each other, the first side plate 21 and the second side plate 22 are parallel to each other and perpendicular to the bottom plate, the first side plate 21 is provided with a liquid injection port 23 for insulating coolant, and the second side plate 22 is provided with a liquid outlet The insulating coolant enters the accommodating cavity through the liquid injection port 23 to cool the battery cell cluster 3 and then is discharged through the liquid outlet 24; the projection of the liquid injection port 23 on the second side plate 22 and the liquid outlet 24 are diagonally distributed on the second side plate 22, that is, the liquid injection port 23 and the liquid outlet 24 are respectively arranged at the corners farthest from the first side plate 21 and the second side plate 22. Compared with the arrangement in which the liquid outlet 24 and the liquid injection port 23 are arranged on the same side plate, the cooling effect on the battery cell cluster 3 is ensured while shortening the flow distance of the coolant in the accommodating cavity, thereby preventing uneven temperatures of the battery cells on both sides of the module from affecting the battery performance; and all the insulating coolant will reach the liquid outlet 24 after passing through the battery cell cluster 3, thereby ensuring that all the insulating coolant dissipates sufficient heat to the battery cell cluster 3 and ensuring the cooling efficiency of the immersion battery pack.
[0027] In some embodiments of the utility model, the liquid injection port 23 is arranged at the corner of the first side plate 21 away from the top cover 1. The liquid injection port 23 can be arranged at the left corner or the right corner of the first side plate 21 near the bottom, and can be arranged near the edge. The liquid outlet 24 is arranged at the corner of the bottom plate of the second side plate 22 near the bottom cover 2. The liquid outlet 24 can also be arranged at the left corner or the right corner of the top of the second side plate 22 corresponding to the position of the liquid injection port 23. As long as the projection of the liquid injection port 23 in the second side plate 22 is kept diagonally arranged with the liquid outlet 24, this arrangement makes the insulating coolant reach the longest travel between the first side plate 21 and the second side plate 22, ensuring the cooling effect of the insulating coolant on the battery cell cluster 3 and the cooling efficiency of the immersion battery pack.
[0028] In some embodiments of the present invention, the liquid filling port 23 and the liquid outlet port 24 can be connected to an external cooling system pipeline (such as a water chiller and a circulation pump) to realize a heat exchange cycle inside the immersed battery pack; when the external cooling system starts working, the coolant will circulate between the external cooling system pipeline and the immersed battery pack.
[0029] In some embodiments of the utility model, a plurality of liquid injection ports 23 are provided on the first side plate 21, and a plurality of liquid outlets 24 are provided on the second side plate 22. The plurality of liquid injection ports 23 and the liquid outlets 24 can be connected to different external cooling system pipelines, and also have a large control space for the flow rate and flow rate of the insulating coolant, thereby improving the heat dissipation threshold of the battery pack; the positions of the plurality of liquid outlets 24 and the plurality of liquid injection ports 23 are also diagonally distributed, that is, the plurality of liquid outlets 24 are distributed together at the top corner on the same side of the second side plate 22, and the plurality of liquid injection ports 23 are distributed together at the bottom corner of the first side plate 21 which is diagonally distributed relative to the second side plate 22, so as to prevent uneven temperature of the battery cells on both sides of the module.
[0030] In some embodiments of the utility model, a guide groove plate 25 is provided in the accommodating cavity. The guide groove plate 25 can be arranged perpendicular to the side plate or parallel to the side plate. It forms a flow channel for the insulating coolant in the accommodating cavity, so that the insulating coolant forms a flow direction in the accommodating cavity that passes through the battery cell cluster 3 and flows toward the liquid outlet 24. No specific limitation is made here. The guide groove plate 25 is distributed around the battery cell cluster 3. After the insulating coolant enters the liquid injection port 23, it is guided to the liquid outlet 24 through the guide groove plate 25. During the flow process, the insulating coolant will take away the heat generated by the battery cell cluster 3 and send it to the external water cooler or circulating pump through the liquid outlet 24.
[0031] In some embodiments of the utility model, the battery cell cluster 3 includes a plurality of battery cell shells arranged at intervals, and the battery cell shells can be square or circular; the guide groove plate 25 is arranged between the battery cell shells to form a flow channel for the insulating coolant. Specifically, the battery cell shells are connected in series and parallel by welding, and a certain gap is reserved between the battery cell shells to allow the insulating coolant to pass through; preferably, the battery cell shells can be separated and fixed by a rubber strip or a plastic bracket. The battery cell shells and the bottom plate of the bottom cover 2 can be bonded together by glue injection. A certain gap is reserved between the battery cell cluster 3 and the side plate of the bottom cover 2; further, a buffer block is installed between the battery cell cluster 3 and the side plate of the bottom cover 2 to avoid collision between the battery cell cluster 3 and the side plate of the bottom cover 2 due to shaking.
[0032] In some embodiments of the utility model, a pressure relief valve 11 is provided on the top cover 1, and the pressure relief valve 11 is connected to the accommodating cavity to prevent excessive pressure inside the submerged battery pack, which may cause structural damage to the submerged battery pack and leakage of the insulating coolant. The pressure relief valve 11 can release excess pressure generated inside the submerged battery pack, thereby improving the safety of the submerged battery pack.
[0033] In some embodiments of the utility model, the upper cover of the top cover 1 is provided with a pressure sensor hole 12, which is a through hole for fixing a pressure sensor facing the accommodating cavity, and the pressure sensor can monitor the air pressure value inside the accommodating cavity in real time. The pressure sensor is electrically connected to the pressure relief valve 11, and when the pressure sensor detects that the pressure value is greater than the preset value, a warning notification is issued and the pressure relief valve 11 is opened to release the pressure, thereby further improving the safety of the submerged battery pack.
[0034] In some embodiments of the utility model, a low-voltage wiring harness port 26 is provided on the first side panel 21, the battery cell cluster 3 includes a voltage acquisition circuit, the low-voltage wiring harness port 26 is connected to the voltage acquisition circuit, and the low-voltage wiring harness port 26 is an output port for the battery cell temperature and voltage data, which is used to output the battery information to facilitate the user to observe the battery data.
[0035] In some embodiments of the utility model, a total negative electrode output terminal 27 is provided on the first side plate 21, and a total positive electrode output terminal 28 is provided on the second side plate 22. The battery cell cluster 3 includes a total positive electrode bar and a total negative electrode bar. The total positive electrode bar and the total negative electrode bar are arranged close to the first side plate 21 and the second side plate 22, so that the total negative electrode output terminal 27 is connected to the total negative electrode bar, and the total positive electrode output terminal 28 is connected to the total positive electrode bar. After the connection, two poles connecting the submerged battery pack with the outside world are formed, which are used for charging and discharging the submerged battery pack to form a stable current loop.
[0036] In some embodiments of the utility model, a third side panel is connected between the first side panel 21 and the second side panel 22. The third side panel is perpendicular to the first side panel 21 and the second side panel 22. A plurality of detachable handles 29 are provided on the third side panel to facilitate the installation and transportation of the module.
[0037] In some preferred embodiments of the utility model, the insulating coolant uses an insulating fluoride liquid; the battery cluster is 1P8S, the battery cell is a 280Ah lithium iron phosphate square shell battery cell, and the battery cell voltage is 2.5V / 3.65V. The liquid injection port 23 and the liquid outlet 24 are connected to the water cooler respectively; the fluoride liquid is injected, and the water cooler is started, and the temperature and flow rate of the liquid injection port 23 are set so that the insulating coolant enters the liquid injection port 23 at a certain speed and temperature, and circulates in the water cooler and the immersion battery pack. The immersion battery pack is charged and discharged twice at 0.5CP, and the voltage and temperature of each battery cell are collected to examine the temperature distribution of the battery cell.
[0038] Experimental process:
[0039]
[0040] The experimental results show that the temperature distribution of the submerged battery pack is more uniform during the charging and discharging process; compared with the traditional module with bottom contact liquid cooling plate, the temperature rise of the submerged battery pack is smaller, and the peak temperature of the battery cell cluster 3 during charging does not exceed 33°C, and the maximum temperature rise does not exceed 12°C. It can be seen from the experimental data that the temperature control effect of the submerged battery module of the utility model is remarkable.
[0041] The working process of the utility model is as follows: a receiving cavity for receiving the battery cell cluster 3 is formed between the bottom cover 2 and the top cover 1, and the receiving cavity is filled with insulating coolant for cooling the battery cell cluster 3. The first side plate 21 and the second side plate 22 opposite to the bottom cover 2 are respectively provided with an injection port 23 and an outlet 24 for insulating coolant. The insulating coolant enters the receiving cavity through the injection port 23 to cool the battery cell cluster 3 and then is discharged through the outlet 24. The projection of the injection port 23 on the second side plate 22 and the outlet 24 are diagonally distributed on the second side plate 22, that is, the injection port 23 and the outlet 24 are respectively arranged at the farthest corners between the first side plate 21 and the second side plate 22, so that the flow distance of the coolant in the receiving cavity is shortened. When the immersion battery pack is working, the top cover 1, the battery cell cluster 3, and the bottom cover 2 are first installed, and then the low-voltage wiring harness, the positive output line, and the negative output line are respectively connected to the low-voltage wiring harness port 26, the positive output terminal, and the negative output terminal. Then, the liquid injection port 23 and the liquid outlet 24 are connected to the external cooling system (such as a water cooler, a circulating pump) at the same time. After the connection is completed, the submerged battery pack is charged and discharged, and the external cooling system starts to work. The coolant will circulate in the external cooling system pipeline and inside the submerged battery pack; inside the module, the insulating coolant is guided by the guide groove plate 25 and flows around the battery cell cluster 3 in the accommodating cavity.
[0042] In summary, the embodiment of the utility model provides an immersion battery pack, which prevents uneven temperature of the battery cells on both sides of the module, and all insulating coolants will reach the liquid outlet 24 after passing through the battery cell cluster 3, ensuring that all insulating coolants can fully dissipate heat for the battery cell cluster 3 and ensure the cooling efficiency of the immersion battery pack.
[0043] The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.
Claims
1. An immersion battery pack, characterized in that: include: Top cover (1); A bottom cover (2), wherein a receiving cavity is formed between the bottom cover (2) and the top cover (1), wherein a battery cell cluster (3) is installed in the receiving cavity, wherein the bottom cover (2) comprises a first side plate (21) and a second side plate (22) which are arranged opposite to each other, wherein the first side plate (21) is provided with a liquid injection port (23) for insulating coolant, and the second side plate (22) is provided with a liquid outlet (24), wherein a projection of the liquid injection port (23) on the second side plate (22) and the liquid outlet (24) on the second side plate (22) are diagonally distributed.
2. The submerged battery pack according to claim 1, characterized in that: The liquid injection port (23) is arranged at a corner of the first side plate (21) away from the top cover (1), and the liquid outlet (24) is arranged at a corner of the second side plate (22) close to the bottom plate of the bottom cover (2).
3. The submerged battery pack according to claim 1 or 2, characterized in that: The first side plate (21) is provided with a plurality of liquid injection ports (23), and the second side plate (22) is provided with a plurality of liquid outlet ports (24), and the positions of the plurality of liquid outlet ports (24) and the plurality of liquid injection ports (23) are also distributed diagonally.
4. The submerged battery pack according to claim 1, characterized in that: A guide groove plate (25) is provided in the accommodating cavity, and the guide groove plate (25) is distributed around the battery cell cluster (3). After the insulating coolant enters the liquid injection port (23), it is guided to the liquid outlet (24) through the guide groove plate (25).
5. The submerged battery pack according to claim 4, characterized in that: The battery cell cluster (3) comprises a plurality of battery cell shells arranged at intervals, and the flow guide plate (25) is arranged between the battery cell shells.
6. The submerged battery pack according to claim 1, characterized in that: The top cover (1) is provided with a pressure relief valve (11), and the pressure relief valve (11) is connected to the accommodating chamber.
7. The submerged battery pack according to claim 1, characterized in that: The top cover (1) is provided with a pressure sensor hole (12) for fixing the pressure sensor facing the accommodating cavity.
8. The submerged battery pack according to claim 1, characterized in that: A low-voltage harness port (26) is provided on the first side plate (21), the battery cell cluster (3) comprises a voltage collection circuit, and the low-voltage harness port (26) is connected to the voltage collection circuit.
9. The submerged battery pack according to claim 1, characterized in that: The first side plate (21) is provided with a total negative electrode output terminal (27), the second side plate (22) is provided with a total positive electrode output terminal (28), the battery cell cluster (3) comprises a total positive electrode sheet and a total negative electrode sheet, the total negative electrode output terminal (27) is connected to the total negative electrode sheet, and the total positive electrode output terminal (28) is connected to the total positive electrode sheet.
10. The submerged battery pack according to claim 1, characterized in that: A third side panel is connected between the first side panel (21) and the second side panel (22), and a plurality of detachable handles (29) are provided on the third side panel.