CN116345017A

CN116345017A - Power battery system and new energy automobile

Info

Publication number: CN116345017A
Application number: CN202310406594.5A
Authority: CN
Inventors: 刘峰; 梁宏伟; 陈保国; 彭月猛
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Jiewei Power Changxing Co ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-06-27

Abstract

The invention discloses a power battery system and a new energy automobile, which belong to the technical field of batteries, wherein the power battery system comprises a battery compartment box body, a battery pack and a flow dividing plate, the battery compartment is provided with a liquid inlet and a liquid outlet, the liquid inlet is used for injecting cooling liquid, and the liquid outlet is used for discharging the cooling liquid; the battery pack is arranged in the battery compartment body and can be immersed by the cooling liquid in the battery compartment body; the flow dividing plate is fixedly arranged in the battery compartment body and is provided with a plurality of flow dividing holes, and the flow dividing plate is used for dividing the cooling liquid injected from the liquid inlet. The power battery system and the new energy automobile provided by the invention have the advantages that the structure of the power battery system is simpler, the cooling effect is better, and the new energy automobile can meet the requirements of quick charge and safety.

Description

Power battery system and new energy automobile

Technical Field

The invention relates to the technical field of batteries, in particular to a power battery system and a new energy automobile.

Background

The power battery is an important part of the new energy automobile, and the safety and reliability, the charging time and the endurance mileage of the new energy automobile are all related to the relevant performance of the power battery. And the charging time of the power battery becomes the main improvement direction of the power battery. At present, if the charging time is shortened, the high-power charging needs to be satisfied, and the high-power charging of the power battery must cause the temperature rise of the battery module to be too fast, if the temperature cannot be effectively reduced in time, the risk of thermal runaway exists, and then the safety and the reliability of the battery are affected.

In the prior art, the cooling of the power battery is usually air cooling and liquid cooling. The air cooling is a heat dissipation mode which uses low-temperature air as a medium and uses cold air to contact the surface of the battery to exchange heat, so that the temperature of the battery is reduced. The air cooling system has the advantages of simple structure, relatively mature technology and low cost. But because the coefficient of heat conductivity of air is low, the heat quantity which can be taken away is limited, the heat exchange efficiency is low, and the temperature inside the power battery is also easy to be uneven. The liquid cooling is a heat dissipation mode for reducing the temperature of the power battery by carrying away the heat generated by the power battery through liquid convection heat exchange. The indirect liquid cooling mainly used for the power battery at present is that the battery module is cooled by the liquid cooling plate, so that more parts of the whole power battery are caused, the structure is complex and the cooling effect is limited.

Therefore, a power battery system and a new energy automobile are needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a power battery system and a new energy automobile, which have simple structure and good cooling effect.

The technical scheme adopted by the invention is as follows:

a power cell system comprising:

the battery compartment is provided with a liquid inlet and a liquid outlet, the liquid inlet is used for injecting cooling liquid, and the liquid outlet is used for discharging the cooling liquid;

the battery pack is arranged in the battery compartment and can be immersed by the cooling liquid in the battery compartment;

the flow dividing plate is fixedly arranged in the battery compartment and provided with a plurality of flow dividing holes, and the flow dividing plate is used for dividing the cooling liquid injected from the liquid inlet.

Optionally, the battery compartment is provided with a liquid inlet channel, the liquid inlet channel is communicated with the liquid inlet, and the flow dividing hole is communicated with the liquid inlet channel.

Optionally, the battery compartment includes the box and set firmly in first separator in the box, the inlet with the liquid outlet is located respectively on the box, the group battery install in the box and dodge first separator, first separator is followed the length direction of box extends and has the inlet channel, just first separator has the intercommunication the export of inlet channel, the reposition of redundant personnel hole with the export intercommunication.

Optionally, one end of the first separator is fixedly connected to one end of the box, the other end of the first separator is fixedly connected to the other end of the box, the bottom wall of the first separator is connected with the bottom wall of the box, the two sides of the first separator in the thickness direction are respectively provided with the outlets, and the two sides of the first separator are respectively provided with the splitter plates.

Optionally, the battery compartment further includes a second separator, the second separator is fixedly disposed in the box and is perpendicular to the first separator, the first separator and the second separator separate the box to form a plurality of mutually independent cavities, each cavity corresponds to the outlet, each cavity is communicated with the liquid outlet, the battery pack includes a plurality of stacking units, the stacking units correspond to the cavities one to one, and the stacking units are mounted in the cavities corresponding to the stacking units.

Optionally, the stacking unit includes a plurality of group batteries of arranging in proper order, and two adjacent be equipped with the round flow spare between the group battery, and two adjacent the group battery, be located two between the group battery round flow spare and form the runner between the diapire of box, a plurality of runner and a plurality of the reposition of redundant personnel hole one-to-one intercommunication and with the liquid outlet intercommunication, the runner is used for supplying cooling liquid to flow.

Optionally, the flow-around member includes a first flow-around portion and a second flow-around portion, a dimension of the first flow-around portion in a height direction of the battery pack is larger than a dimension of the second flow-around portion in the height direction of the battery pack, and the first flow-around portion is closer to the flow dividing hole than the second flow-around portion.

Optionally, the battery compartment is provided with a liquid outlet channel, the liquid outlet channel is communicated with the liquid outlet, and the cooling liquid in the battery compartment can flow into the liquid outlet channel.

Optionally, the liquid outlet channel is arranged on the side wall of the battery compartment, an inlet is formed in the side wall of the battery compartment, the inlet is communicated with the liquid outlet channel, and the cooling liquid in the battery compartment can flow to the liquid outlet channel through the inlet.

Optionally, the battery module further comprises a current collecting plate arranged in the battery compartment, the current collecting plate is provided with a plurality of current collecting holes, the current collecting plate and the side wall provided with the liquid outlet flow channel form a current collecting cavity, and the current collecting holes and the inlet are respectively communicated with the current collecting cavity.

Optionally, still include electric cabin, BMS mainboard, BMS follow board and high-voltage output busbar, electric cabin connect in the one end of battery compartment and can with battery compartment intercommunication, the BMS mainboard is located in the electric cabin, the BMS follow board is located in the battery compartment, the BMS mainboard with the BMS is worn to locate through sealed battery compartment reaches the cable electricity of electric cabin is connected, perhaps, the BMS mainboard with BMS is followed board wireless communication and is connected, high-voltage output busbar set firmly in the battery compartment.

Optionally, a support beam is fixed in the battery compartment, the support beam is provided with an exhaust channel, the power battery system further comprises a gas-liquid separation valve, the gas-liquid separation valve is installed on the support beam, an explosion-proof valve is installed on at least one wall of the electric compartment, and the gas-liquid separation valve is configured to be opened when the pressure of the gas in the battery compartment is greater than a preset pressure, so that the gas in the battery compartment enters the electric compartment through the gas-liquid separation valve and the exhaust channel, and is discharged out of the electric compartment through the explosion-proof valve.

The new energy automobile comprises a thermal management system and the power battery system, wherein the liquid inlet and the liquid outlet are respectively communicated with the thermal management system.

The power battery system and the new energy automobile provided by the invention have the beneficial effects that:

through with the group battery can direct submergence in the coolant liquid, take away the heat that the group battery charges and discharge in-process produced with the flow of coolant liquid, improved the coolant liquid effect of group battery, reducible power battery system takes place thermal runaway and thermal diffusion's risk, effectively improve battery power system's security to, need not to set up the liquid cooling board in the battery compartment, make the part in the battery compartment can be less, and the structure is simpler.

Drawings

Fig. 1 is a schematic structural diagram of a power battery system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a second structure of the power battery system according to the embodiment of the present invention;

FIG. 3 is an exploded view of a power cell system according to an embodiment of the present invention;

FIG. 4 is a schematic view of a flow splitter plate according to an embodiment of the invention;

FIG. 5 is an enlarged partial schematic view of a diverter plate according to an embodiment of the present invention;

fig. 6 is an assembled schematic view of a battery compartment, a first separator, and a second separator provided in an embodiment of the present invention;

FIG. 7 is a schematic view of a side wall of a shell according to an embodiment of the present invention;

FIG. 8 is a top view of a power cell system provided by an embodiment of the present invention;

FIG. 9 is a cross-sectional view A-A of FIG. 8 in accordance with the present invention;

FIG. 10 is a cross-sectional view B-B as shown in FIG. 8 in accordance with the present invention;

FIG. 11 is an enlarged schematic view of the invention at E shown in FIG. 10;

fig. 12 is an enlarged view of a portion of a cross-sectional view of a power cell system provided by an embodiment of the present invention;

FIG. 13 is a cross-sectional view of the C-C of FIG. 8 in accordance with the present invention;

FIG. 14 is an enlarged schematic view of the invention at F shown in FIG. 13;

FIG. 15 is an enlarged schematic view of the invention at M shown in FIG. 13;

FIG. 16 is a D-D sectional view of the invention shown in FIG. 8;

FIG. 17 is an enlarged schematic view of the invention at G shown in FIG. 16;

FIG. 18 is an enlarged schematic view of the invention at H shown in FIG. 16;

fig. 19 is a second exploded view of the power cell system according to the embodiment of the present invention;

FIG. 20 is a top view of a portion of a power cell system provided by an embodiment of the present invention;

FIG. 21 is an exploded schematic view of a stacking unit provided by an embodiment of the present invention;

fig. 22 is a simplified schematic diagram of a new energy automobile according to an embodiment of the present invention.

In the figure:

1. a battery compartment; 11. a liquid inlet; 12. a liquid outlet; 13. a liquid inlet flow channel; 14. a liquid outlet channel; 15. an inlet; 101. a case; 1011. a cavity; 1012. a bottom case; 10121. a shell sidewall; 1013. a cover plate; 102. a first separator; 1021. an outlet; 103. a second separator;

2. a battery pack; 21. a stacking unit; 211. a battery; 212. a CCS component; 213. an insulating protection plate;

3. a diverter plate; 31. a diversion aperture; 32. a first bump; 33. a shunt cavity;

4. a flow-around piece; 41. a first bypass portion; 42. a second flow-around part;

5. a flow passage; 6. a current collecting plate; 61. a collecting hole; 62. a manifold; 63. a second bump;

7. an electric compartment; 71. a trapezoid box; 72. a trapezoid cover; 8. BMS main board; 9. BMS slave plates; 10. an explosion-proof valve; 20. a high voltage output bus; 201. an exhaust passage; 202. a gas-liquid separation valve; 30. an insulating member; 301. an exhaust hole; 40. a high-voltage plug-in; 50. a low pressure insert;

100. a thermal management system; 200. a power battery system; 300. an electric drive system; 400. a tire system.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the invention is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.

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

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The embodiment provides a power battery system, which has a simpler structure and better cooling effect.

As shown in fig. 1 to 3, the power battery system 200 includes a battery compartment 1, a battery pack 2, and a flow dividing plate 3.

The battery compartment 1 has a liquid inlet 11 and a liquid outlet 12, in some embodiments, the liquid inlet 11 and the liquid outlet 12 may be disposed on a side wall of the battery compartment 1, in other embodiments, the liquid inlet 11 and the liquid outlet 12 may be disposed on other walls of the battery compartment 1, which is not limited in this embodiment. The inlet 11 and the outlet 12 may be located on the same wall or on different walls. The liquid inlet 11 is used for injecting cooling liquid, the liquid outlet 12 is used for discharging cooling liquid, namely, the liquid inlet 11 and the liquid outlet 12 are respectively connected with a cooling system, and cooling liquid enters the battery compartment 1 through the liquid inlet 11 and flows out of the battery compartment 1 through the liquid outlet 12.

The battery pack 2 is fixedly mounted in the battery compartment 1 and can be immersed by the cooling liquid in the battery compartment 1 so that the cooling liquid in the battery compartment 1 can cool the battery pack 2. The above-mentioned flow distribution plate 3 is fixedly arranged in the battery compartment 1, and as shown in fig. 3, the flow distribution plate 3 has a plurality of flow distribution holes 31, and the flow distribution plate 3 is used for distributing the cooling liquid injected from the liquid inlet 11, so that the cooling liquid can uniformly flow to the battery pack 2, and further the cooling uniformity of the battery pack 2 is improved. In some embodiments, as shown in fig. 4 and 5, the plurality of diverting holes 31 on the diverting plate 3 are uniformly and at intervals.

According to the power battery system 200 provided by the embodiment, the battery pack 2 is directly immersed in the cooling liquid, heat generated in the charging and discharging processes of the battery pack 2 is taken away by utilizing the flowing of the cooling liquid, the cooling liquid effect of the battery pack 2 is improved, the risks of thermal runaway and thermal diffusion of the power battery system 200 can be reduced, the safety of the battery power system is effectively improved, and a liquid cooling plate is not required to be arranged in the battery compartment 1, so that components in the battery compartment 1 can be fewer, and the structure is simpler.

Alternatively, as shown in fig. 8 and 9, the battery compartment 1 has a liquid inlet channel 13, and the liquid inlet channel 13 communicates with the liquid inlet 11 so that the cooling liquid flowing in from the liquid inlet 11 can enter the liquid inlet channel 13. The liquid inlet flow channel 13 extends from one end of the battery compartment 1 to the other end, so that the liquid inlet flow channel 13 can span the whole battery compartment 1, and the flow dividing hole 31 is communicated with the liquid inlet flow channel 13, so that the cooling liquid in the liquid inlet flow channel 13 can flow into the flow dividing hole 31.

Further, as shown in fig. 6, the battery compartment 1 includes a case 101 and a first partition 102 fixed in the case 101. The liquid inlet 11 and the liquid outlet 12 are respectively disposed on the case 101, the battery pack 2 is mounted in the case 101 and is disposed so as to avoid the first separator 102, and the first separator 102 extends along the length direction of the case 101 and has the liquid inlet channel 13, that is, the liquid inlet channel 13 is disposed in the first separator 102, and illustratively, the first separator 102 is provided with a hole structure or a groove structure, which forms the liquid inlet channel 13. The first separator 102 has an outlet 1021 communicating with the intake runner 13, and the coolant in the intake runner 13 can flow out through the outlet 1021. The tap hole 31 communicates with the outlet 1021 such that the coolant flowing out from the outlet 1021 can flow into the tap hole 31. Alternatively, the first separator 102 may be provided at the middle of the case 101.

Still alternatively, referring to fig. 9, one end of the first separator 102 is fixedly connected to one end of the case 101, the other end of the first separator 102 is fixedly connected to the other end of the case 101, and the bottom wall of the first separator 102 is connected to the bottom wall of the case 101, that is, the first separator 102 can separate the case 101, and the cavities on two sides of the first separator 102 in the thickness direction are independent from each other. Alternatively, the first separator 102 may be provided in one or more, and when the first separator 102 is provided in plural, the plural first separators 102 are disposed in parallel with each other.

And, both sides in the thickness direction of the first separator 102 are respectively provided with an outlet 1021 communicated with the liquid inlet channel 13, so that the cooling liquid in the liquid inlet channel 13 can flow to both sides of the first separator 102, and the diversion of the cooling liquid is realized. Illustratively, as shown in fig. 13, the two sides of the first separator 102 are respectively provided with the flow dividing plates 3, so that the two flow dividing plates 3 can divide the cooling liquid at the two sides of the first separator 102, thereby further improving the flow dividing effect.

In some embodiments, the splitter plate 3 is disposed near the first separator 102, that is, the splitter plate 3 is located between the battery pack 2 and the first separator 102, and the splitter plate 3 may be sandwiched between the battery pack 2 and the first separator 102, and/or two ends of the splitter plate 3 may be fixed on two end walls of the case 101, and/or the splitter plate 3 is fixed on the first separator 102, so long as it is ensured that the splitter plate 3 is not moved by the coolant.

Optionally, referring to fig. 6, the battery compartment 1 further includes a second separator 103, where the second separator 103 is fixed in the case 101 and is disposed perpendicular to the first separator 102. The first separator 102 and the second separator 103 separate the case 101 to form a plurality of independent cavities 1011, in this embodiment, the number of the cavities 1011 is related to the number of the first separator 102 and the second separator 103, as in fig. 6, the battery compartment 1 includes one first separator 102 and one second separator 103, the first separator 102 and the second separator 103 are disposed in a cross shape, and the case 101 is separated to form four cavities 1011. Each cavity 1011 has at least a part of the battery pack 2.

Further, each cavity 1011 corresponds to an outlet 1021, that is, a portion of the first partition 102 forming each cavity 1011 has an outlet 1021, so that each cavity 1011 has a cooling liquid inflow, and each cavity 1011 communicates with the liquid outlet 12, so that each cavity 1011 can constitute a cooling circuit. In addition, the battery pack 2 includes a plurality of stacking units 21, the stacking units 21 are in one-to-one correspondence with the cavities 1011, and each stacking unit 21 is mounted in the corresponding cavity 1011, so that the cooling liquid flowing into each cavity 1011 can cool the stacking unit 21 located in the cavity 1011, thereby realizing the partitioned cooling liquid of the battery pack 2 and further having better cooling liquid effect. It should be noted that, each cavity 1011 corresponds to at least one outlet 1021 and at least one outlet 12, so as to facilitate the inflow and outflow of the cooling liquid. In the present embodiment, the second separator 103 is not limited to the case of forming the cavity 1011 by separation, but may be used for mounting electronic devices.

Further alternatively, as shown in fig. 11 to 18, each of the stacking units 21 includes a plurality of cells 211 arranged in sequence, and the arrangement direction of the plurality of cells 211 may be set according to actual circumstances, and in this embodiment, the arrangement direction of the plurality of cells 211 is parallel to the extending direction of the first separator 102. A flow-around member 4 is disposed between each two adjacent cells 211, and as shown in fig. 11, flow channels 5 are formed between the two adjacent cells 211, the flow-around member 4 disposed between the two cells 211 and the bottom wall of the case 101, that is, the flow channels 5 are plural, the flow channels 5 are in one-to-one correspondence with the plurality of flow-dividing holes 31, and each flow channel 5 is communicated with the corresponding flow-dividing hole 31, the flow channels 5 are also communicated with the liquid outlet 12, and the flow channels 5 are used for flowing cooling liquid, so that the cooling liquid flowing out from the flow-dividing holes 31 can flow into the flow channels 5 corresponding to the flow-dividing holes 31 to cool the cells 211 forming the flow channels 5, and the cooling liquid after absorbing heat flows out through the liquid outlet 12 to form a cooling circuit.

The structure of the flow-around member 4 has various kinds, and this embodiment provides a flow-around member 4, as shown in fig. 16, the flow-around member 4 is an integrally formed structure, and includes a first flow-around portion 41 and a second flow-around portion 42, the dimension of the first flow-around portion 41 in the height direction of the battery 211 is larger than the dimension of the second flow-around portion 42 in the height direction of the battery 211, and the first flow-around portion 41 is closer to the flow-dividing hole 31 than the second flow-around portion 42, so that the cross-sectional dimension of the end of the formed flow channel 5, which is closer to the flow-dividing plate 3, is smaller than the cross-sectional dimension of the end, which is far from the flow-dividing plate 3, and the flow velocity of the cooling liquid flowing out of the flow-dividing hole 31 can be gradually reduced, and the flow velocity of the cooling liquid with lower temperature is larger than the flow velocity of the cooling liquid with higher temperature, so as to ensure the uniformity of cooling of the battery 211 and reduce the probability of thermal runaway. The above-described structure of the flow-around member 4 (i.e., the flow-around member 4 is in the form of a knife) is applicable to a case where one end of the flow-around member 4 is in contact with the first separator 102 and the other end is in contact with the case 101. In this embodiment, the connection between the first flow-around portion 41 and the second flow-around portion 42 is inclined, or the first flow-around portion 41 is trapezoidal, and the end surface of the first flow-around portion 41 near one end of the second flow-around portion 42 is inclined, so as to prevent the formation of vortex in the flowing process of the cooling liquid and increase the power loss.

When the flow-around member 4 is disposed between the two first separators 102, the flow-around member 4 may not have the above-described shape, but may have a rectangular parallelepiped shape, which is not limited in this embodiment.

Alternatively, as shown in fig. 4 and 5, the surface of the splitter plate 3 facing the first separator 102 has a first bump 32, the first bump 32 is used for contacting the first separator 102, in this embodiment, the two ends and the bottom of the first bump 32 have the first bump 32 respectively, and as shown in fig. 15, a split cavity 33 can be formed between the splitter plate 3 and the first separator 102, the cooling liquid flowing out from the outlet 1021 flows into the split cavity 33, and the cooling liquid in the split cavity 33 flows out from the split hole 31 and flows into the runner 5. By providing the diversion chamber 33, the coolant can be made to flow uniformly into the plurality of diversion holes 31.

In this embodiment, as shown in fig. 7, the battery compartment 1 has a liquid outlet channel 14, in this embodiment, the liquid outlet channel 14 is disposed on a side wall of the case 101, in some embodiments, the case 101 includes a bottom shell 1012 and a cover plate 1013, the bottom shell 1012 has four shell side walls 10121, two shell side walls 10121 opposite to each other in a length direction of the bottom shell 1012 are respectively provided with a liquid inlet 11 and a liquid outlet 12, and two shell side walls 10121 opposite to each other in a width direction of the bottom shell 1012 are respectively provided with the liquid outlet channel 14. It will be understood, of course, that one of the housing side walls 10121 may be provided with the liquid outlet channel 14, which is not limited in this embodiment. Optionally, the housing sidewall 10121 of the liquid outlet channel 14 is hollow to reduce the weight of the power battery system 200.

Further alternatively, the liquid outlet channel 14 is communicated with the liquid outlet 12, and the liquid outlet channel 14 extends from one end to the other end of the box 101, so that the cooling liquid in the battery compartment 1 can flow into the liquid outlet channel 14, and then flows out of the battery compartment 1 through the liquid outlet channel 14 and the liquid outlet 12.

In some embodiments, the liquid outlet channel 14 is disposed on a side wall of the battery compartment 1 (i.e. the shell side wall 10121), the side wall of the battery compartment 1 is provided with an inlet 15, and the inlet 15 is in communication with the liquid outlet channel 14. Optionally, when the cavities 1011 are provided with a plurality of cavities, each cavity 1011 corresponds to at least one inlet 15, so that the cooling liquid in the cavity 1011 flows to the liquid outlet channel 14 through the inlet 15, that is, the cooling liquid in the battery compartment 1 can flow to the liquid outlet channel 14 through the inlet 15, and further flows out of the battery compartment through the liquid outlet channel 14 and the liquid outlet 12. The arrangement of the liquid outlet channel 14 is convenient for collecting the cooling liquid, and then is convenient for discharging the cooling liquid.

Alternatively, as shown in fig. 13 and 14, the power battery system 200 further includes a current collecting plate 6 provided in the battery compartment 1. The collecting plate 6 has a plurality of collecting holes 61, the plurality of collecting holes 61 are in one-to-one correspondence with the plurality of flow passages 5, and each collecting hole 61 communicates with its corresponding flow passage 5, and the cooling liquid in each flow passage 5 flows into the liquid outlet flow passage 14 through the collecting hole 61. The manifold plate 6 and the side wall provided with the liquid outlet channel 14 form a manifold 62, the manifold hole 61 and the inlet 15 are respectively communicated with the manifold 62, and the coolant flowing out of the manifold hole 61 flows into the manifold 62, flows into the liquid outlet channel 14 through the manifold 62 and the inlet 15, and flows out of the battery compartment 1 through the liquid outlet 12.

The structure of the current collecting plate 6 in this embodiment is the same as that of the current distributing plate 3, that is, as shown in fig. 21, the two ends and the bottom of the current collecting plate 6 are respectively provided with second protrusions 63, the second protrusions 63 are used for contacting with the shell side wall 10121, and as shown in fig. 14, the current collecting plate 6 and the shell side wall 10121 form the current collecting cavity 62. It should be noted that, one side of each of the case side walls 10121 is provided with a current collecting plate 6, and the current collecting plate 6 is sandwiched between the battery 211 and the case side wall 10121, and/or the current collecting plate 6 is fixed on the battery 211, which is not limited in this embodiment. It should be noted that, each of the shell side walls 10121 corresponds to one of the liquid outlets 12, that is, two liquid outlets 12 are provided, and two liquid outlets 12 are provided on the same side wall of the case 101.

Alternatively, as shown in fig. 3 and 19, the power battery system 200 further includes an electric compartment 7, a BMS main board 8, a BMS slave board 9, and a high voltage output bus 20. Wherein the electric compartment 7 is connected to one end of the battery compartment 1 and can communicate with the battery compartment 1. In this embodiment, the electrical cabinet 7 includes a trapezoid case 71 and a trapezoid cover 72 provided on the trapezoid case 71, the trapezoid case 71 is connected to the case 101 or is integrally formed, and the trapezoid cover 72 is connected to the cover 1013. The high voltage output bus bar 20 is fixedly arranged in the battery compartment 1 and is used for converging the current generated by the battery 211.

In some embodiments, the electric compartment 7 shares a wall with the battery compartment 1, the wall being provided with holes through which the electric compartment 7 can communicate with the battery compartment 1.

In some alternative embodiments, the BMS motherboard 8 is located in the electrical compartment 7 and the BMS slave board 9 is located in the battery compartment 1. In some embodiments, the BMS motherboard 8 and the BMS slave board 9 are electrically connected by cables that pass through the battery compartment 1 and the electrical compartment 7 in a sealed manner to enable communication between the BMS motherboard 8 and the BMS slave board 9. In other embodiments, the BMS motherboard 8 is connected to the BMS slave board 9 in a wireless communication manner, so that leakage of the cooling liquid in the battery compartment 1 can be reduced, and tightness of the battery compartment 1 is ensured, and the BMS motherboard 8 is provided with a receiving antenna in the electrical compartment 7. The specific structure and arrangement positions of the BMS main board 8 and the BMS slave board 9 may be referred to in the related art, and the BMS slave board 9 may be fixedly mounted on the second separator 103, for example. Wherein, the Chinese definition of BMS is battery management system.

In this embodiment, a support beam is fixed in the battery compartment 1, and as shown in fig. 18, the support beam has an exhaust passage 201, and the exhaust passage 201 can communicate with a hole in a wall between the battery compartment 1 and the electric compartment 7. The explosion-proof valve 10 is installed on at least one wall of the electric cabin 7, the power battery system further comprises a gas-liquid separation valve 202, the gas-liquid separation valve 202 is installed on the supporting beam, the gas-liquid separation valve 202 is configured to be opened when the pressure of gas in the battery cabin 1 is larger than a preset pressure, so that the gas in the battery cabin 1 enters the electric cabin 7 through the gas-liquid separation valve 202 and the exhaust channel 201 and is discharged out of the electric cabin 7 through the explosion-proof valve 10, high-temperature gas generated by thermal runaway can be transmitted in the exhaust channel 201, the temperature is reduced in the transmission process, the temperature of the gas reaching the valve port of the explosion-proof valve 10 is not too high, the probability of occurrence of excessive open flame is reduced, and the safety of the power battery system is improved. The battery cells in the battery compartment 1 generate gas after thermal runaway, and when the gas gradually increases, the gas pressure in the battery compartment 1 increases. The support beam in this embodiment may be a cross beam or a longitudinal beam, or may be the first separator 102 and the second separator 103, which are described above, and this embodiment is not limited thereto, and the exhaust passage 201 and the passage through which the coolant flows are independent of each other.

In this embodiment, the specific structure of the gas-liquid separation valve 202 may refer to the prior art, and only the battery compartment 1 needs to be sealed, so that the cooling liquid in the battery compartment 1 cannot be leaked.

Further, as shown in fig. 1, at least one wall of the electric compartment 7 is installed with an explosion-proof valve 10, in this embodiment, two walls of the electric compartment 7 adjacent to the battery compartment 1 are respectively provided with the explosion-proof valve 10, and the gas-liquid separation valve 202 is configured to be opened when the pressure of the gas in the battery compartment 1 is greater than a preset pressure, so that the gas in the battery compartment 1 enters the electric compartment 7 and is discharged from the electric compartment 7 through the explosion-proof valve 10, thereby realizing directional explosion-removal of thermal runaway of the telecom battery pack 2 and improving the safety of the power battery system 200. In this embodiment, a high voltage plug-in 40 and a low voltage plug-in 50 are further provided on any wall of the electric compartment 7 for plugging with an electrical connector or the like to output electric energy of the power battery system 200.

Optionally, the power battery system 200 further comprises an insulating member 30, wherein the insulating member 30 is located in the battery compartment 1 and is arranged to cover the battery pack 2 for insulation between the battery pack 2 and the cover plate 1013. The insulator 30 is provided with a vent 301 for venting at the time of thermal runaway. Fig. 21 is a schematic structural diagram of a stacking unit 21 according to the present embodiment, as shown in fig. 21, each stacking unit 21 includes not only a plurality of batteries 211, but also CCS components 212, wherein the english language of CCS is called Cells Contact System, and the chinese language definition is an integrated module formed by connecting 1-2 flexible circuit boards, plastic and other material structural members, and copper-aluminum bars. With continued reference to fig. 21, each of the cells 211 may include a single cell or a plurality of cells, where the plurality of cells are arranged in a direction parallel to the length direction of the winding member 4, and a cell member flow path 5 is formed between the plurality of cells of one cell 211 and the plurality of cells of another cell 211. CCS assembly 212 is configured to electrically connect to each of the cells.

Further, each of the stacking units 21 further includes two insulation protection plates 213, and the two insulation protection plates 213 are respectively located at both ends in the arrangement direction of the plurality of cells 211 and serve for insulation of both ends of the stacking unit 21. The stacking unit 21 is connected with the case 101 (or the cavity 1011) by filling structural adhesive therebetween to increase structural connection reliability. An insulating member 30 is provided between the stacking unit 21 and the cap plate 1013, the insulating member 30 not only insulating the functions of the battery cell and the cap plate 1013; the cooling device also has a filling space, so that the consumption of cooling liquid can be reduced; the insulating member 30 also has the function of preventing the cover plate 1013 from being deformed, etc. by the coolant around the top of the case 101, that is, the coolant is also provided between the insulating member 30 and the battery cell to ensure the cooling effect.

Aiming at the requirements of the current market on quick charge (10 min/18 min@10-80%SOC) of the power battery system 200, the power battery system 200 provided by the embodiment is designed in an integrated way, the liquid inlet 11 and the liquid outlet 12 are integrated with the box body 101, the traditional heat management structure of the battery is canceled, such as a liquid cooling plate and a liquid cooling pipeline, the heat exchange performance of the power battery system 200 is improved, the cooling liquid is insulated, the pressure resistance and the stability are high, the experience anxiety of a user on long charging time of an electric automobile is thoroughly solved, the directional explosion venting of the battery thermal runaway is realized through the gas-liquid separation design, and the use safety of a battery pack is improved. The battery pack module structure in the prior art is canceled, and the number of parts and the cost are reduced; the immersed thermal management system realizes the application of the full-temperature threshold battery compartment 1; and the gas-liquid separation, thermal runaway prevention and control and directional explosion venting design improves the safety of the battery system.

In this embodiment, the power battery system 200 is specifically described as a fully immersed thermal management system, the components such as a traditional liquid cooling plate and a traditional pipeline are omitted in the battery compartment 1, the cooling liquid directly circulates in the battery compartment 1, the battery cells are fully immersed in the cooling liquid, and heat exchange is directly performed between the cooling liquid and the battery cells, so that the high-temperature cooling and low-temperature heating functions of the battery compartment 1 are realized.

It should be emphasized that the battery compartment 1 and the electric compartment 7 are separated, no cooling liquid is in the electric compartment 7, so that electric maintenance and detection are facilitated, the battery compartment 1 is internally provided with a battery core and is communicated with the thermal management system 100 of the whole vehicle, and the cooling liquid can fill the battery compartment 1 through the liquid inlet 11 and the liquid outlet 12 of the battery compartment 1 to form a circulation loop for high-temperature cooling and low-temperature heating of the stacking unit 21; the battery compartment 1 and the electric compartment 7 are communicated through the gas-liquid separation valve 202, the gas-liquid separation valve 202 is arranged at an installation opening on a longitudinal beam or a cross beam in the battery compartment 1 and is used for thermal runaway exhaust, when a certain electric core in the battery compartment 1 is subjected to thermal runaway, the pressure in the battery compartment 1 can be increased suddenly, the liquid level of cooling liquid in the battery compartment is reduced under the action of the pressure, after the pressure reaches the pressure of the gas-liquid separation valve 202, the gas-liquid separation valve 202 is opened, and gas can enter the electric compartment 7 through the gas-liquid separation valve 202 and an exhaust channel 201 on the transverse longitudinal beam in the battery compartment 1, and is discharged through the explosion-proof valves 10 on two sides of the electric compartment 7, so that the pressure relief explosion-proof function is achieved. It should be noted that, this patent is not limited to the arrangement of the battery compartment 1 and the electric compartment 7 along the X direction, but may also be the overlapping arrangement of the Y direction or the X direction, which all belong to this patent scope.

The embodiment also provides a new energy automobile, as shown in fig. 22, which includes the thermal management system 100 and the power battery system 200, where the liquid inlet 11 and the liquid outlet 12 of the power battery system 200 are respectively connected to the thermal management system 100, so as to form a cooling liquid loop. The new energy automobile further comprises a tire system 400 and an electric drive system 300, wherein the thermal management system 100 has a cooling liquid function and a heating function, can radiate heat for the electric drive system 300 and the power battery system, and the thermal management system 100 can also perform low-temperature preheating starting for the power battery system.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A power cell system, comprising:

the battery compartment (1), the battery compartment (1) is provided with a liquid inlet (11) and a liquid outlet (12), the liquid inlet (11) is used for injecting cooling liquid, and the liquid outlet (12) is used for discharging the cooling liquid;

a battery pack (2) mounted in the battery compartment (1) and capable of being immersed by the cooling liquid in the battery compartment (1);

the flow distribution plate (3) is fixedly arranged in the battery compartment (1), the flow distribution plate (3) is provided with a plurality of flow distribution holes (31), and the flow distribution plate (3) is used for distributing the cooling liquid injected from the liquid inlet (11).

2. The power battery system according to claim 1, characterized in that the battery compartment (1) has a liquid inlet flow channel (13), the liquid inlet flow channel (13) being in communication with the liquid inlet (11), the shunt hole (31) being in communication with the liquid inlet flow channel (13).

3. The power battery system according to claim 2, wherein the battery compartment (1) comprises a case (101) and a first separator (102) fixedly arranged in the case (101), the liquid inlet (11) and the liquid outlet (12) are respectively arranged on the case (101), the battery pack (2) is arranged in the case (101) and avoids the first separator (102), the first separator (102) extends along the length direction of the case (101) and is provided with the liquid inlet channel (13), the first separator (102) is provided with an outlet (1021) communicated with the liquid inlet channel (13), and the flow dividing hole (31) is communicated with the outlet (1021).

4. A power battery system according to claim 3, wherein one end of the first separator (102) is fixedly connected to one end of the case (101), the other end of the first separator (102) is fixedly connected to the other end of the case (101), the bottom wall of the first separator (102) is connected to the bottom wall of the case (101), and both sides in the thickness direction of the first separator (102) are provided with the outlets (1021), respectively, and both sides of the first separator (102) are provided with the flow dividing plates (3), respectively.

5. A power battery system according to claim 3, wherein the battery compartment (1) further comprises a second separator (103), the second separator (103) is fixedly arranged in the box (101) and is perpendicular to the first separator (102), the first separator (102) and the second separator (103) separate the box (101) to form a plurality of mutually independent cavities (1011), each cavity (1011) corresponds to the outlet (1021), each cavity (1011) is communicated with the liquid outlet (12), the battery pack (2) comprises a plurality of stacking units (21), the stacking units (21) are in one-to-one correspondence with the cavities (1011), and the stacking units (21) are arranged in the corresponding cavities (1011).

6. The power battery system according to claim 5, wherein the stacking unit (21) comprises a plurality of batteries (211) which are sequentially arranged, a flow-around piece (4) is arranged between two adjacent batteries (211), a flow channel (5) is formed between two adjacent batteries (211), the flow-around piece (4) arranged between two batteries (211) and the bottom wall of the box body (101), the plurality of flow channels (5) are communicated with the plurality of flow distribution holes (31) in a one-to-one correspondence manner and are communicated with the liquid outlet (12), and the flow channel (5) is used for cooling liquid to flow.

7. The power battery system according to claim 6, characterized in that the flow-around member (4) includes a first flow-around portion (41) and a second flow-around portion (42), a dimension of the first flow-around portion (41) in a height direction of the battery (211) is larger than a dimension of the second flow-around portion (42) in the height direction of the battery (211), the first flow-around portion (41) being closer to the flow-dividing hole (31) than the second flow-around portion (42).

8. The power cell system according to any one of claims 1-7, characterized in that the battery compartment (1) has a liquid outlet channel (14), the liquid outlet channel (14) being in communication with the liquid outlet (12), the cooling liquid in the battery compartment (1) being able to flow into the liquid outlet channel (14).

9. The power battery system according to claim 8, wherein the liquid outlet channel (14) is arranged on the side wall of the battery compartment (1), an inlet (15) is formed in the side wall of the battery compartment (1), the inlet (15) is communicated with the liquid outlet channel (14), and the cooling liquid in the battery compartment (1) can flow to the liquid outlet channel (14) through the inlet (15).

10. The power battery system according to claim 9, further comprising a current collecting plate (6) provided in the battery compartment (1), the current collecting plate (6) having a plurality of current collecting holes (61), the current collecting plate (6) and a side wall provided with the liquid outlet flow passage (14) forming a current collecting cavity (62), the current collecting holes (61) and the inlet (15) communicating with the current collecting cavity (62), respectively.

11. The power battery system according to any one of claims 1-7, further comprising an electric compartment (7), a BMS motherboard (8), a BMS slave board (9) and a high voltage output bus bar (20), wherein the electric compartment (7) is connected to one end of the battery compartment (1) and can be communicated with the battery compartment (1), the BMS motherboard (8) is located in the electric compartment (7), the BMS slave board (9) is located in the battery compartment (1), the BMS motherboard (8) is electrically connected with the BMS slave board (9) through a cable penetrating through the battery compartment (1) and the electric compartment (7) in a sealing manner, or the BMS motherboard (8) is connected with the BMS slave board (9) in a wireless communication manner, and the high voltage output bus bar (20) is fixedly located in the battery compartment (1).

12. The power battery system according to claim 11, characterized in that a support beam is fixedly arranged in the battery compartment (1), the support beam is provided with an exhaust channel (201), the power battery system further comprises a gas-liquid separation valve (202), the gas-liquid separation valve (202) is mounted on the support beam, at least one wall of the electric compartment (7) is provided with an explosion-proof valve (10), and the gas-liquid separation valve (202) is configured to be opened when the pressure of the gas in the battery compartment (1) is larger than a preset pressure, so that the gas in the battery compartment (1) enters the electric compartment (7) through the gas-liquid separation valve (202) and the exhaust channel (201), and the electric compartment (7) is discharged through the explosion-proof valve (10).

13. The new energy automobile is characterized by comprising a thermal management system (100) and the power battery system according to any one of claims 1-9, wherein the liquid inlet (11) and the liquid outlet (12) are respectively communicated with the thermal management system (100).