CN220492056U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, comprising: the liquid cooling plate is provided with a plurality of cooling cavities and at least one accommodating cavity, the accommodating cavities are mutually separated, and two cooling cavities are respectively arranged on two sides of one accommodating cavity; the cooling cavity is used for accommodating cooling medium, the liquid cooling plate is further provided with a first opening communicated with the accommodating cavity, the cooling cavity is used for accommodating cooling medium, and the liquid cooling plate is further provided with a first opening communicated with the accommodating cavity; the battery cell has an explosion-proof valve, and the explosion-proof valve sets up with first opening is relative, and the explosion-proof valve is configured as: when the pressure in the single battery reaches a set value, the explosion-proof valve is opened, and substances sprayed from the interior of the single battery through the explosion-proof valve enter the accommodating cavity from the first opening; the cooling medium is capable of cooling the substance in the receiving chamber. The battery pack disclosed by the utility model not only can effectively cool down substances sprayed out of the explosion-proof valve by the single battery, but also can prevent thermal runaway from spreading, and has higher adaptability.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

In the related art, in order to prevent safety accidents of the battery due to thermal runaway, an explosion-proof valve is provided on the battery. When thermal runaway occurs in the battery, the explosion-proof valve may spray a large amount of gas and high-temperature particulate matter. The temperature of gas and high-temperature particles sprayed out of the explosion-proof valve is higher, so that the temperature of the battery pack is increased, and a large amount of gas and high-temperature particles easily cause thermal runaway spreading in the battery pack, so that adjacent batteries in the battery pack are burnt together.

The existing battery pack can be connected to the liquid cooling plate through the explosion-proof valve, and then objects sprayed out of the battery enter the liquid cooling plate, so that the function of protecting adjacent batteries is achieved. However, in order to achieve this, the battery needs to be designed to a specific specification to achieve this, and thus the adaptation of the battery pack is poor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the battery pack which not only can effectively cool the substances sprayed from the explosion-proof valve by the single battery, but also can prevent the thermal runaway from spreading, and has higher adaptability.

A battery pack according to an embodiment of the first aspect of the present utility model includes:

the liquid cooling plate is provided with a plurality of cooling cavities and at least one containing cavity, the containing cavities and the cooling cavities are mutually separated along the width direction of the liquid cooling plate, and two cooling cavities are respectively arranged on two sides of one containing cavity; the cooling cavity is used for accommodating cooling medium, and the liquid cooling plate is further provided with a first opening communicated with the accommodating cavity;

a single cell having an explosion-proof valve disposed opposite the first opening, the explosion-proof valve configured to: when the pressure in the single battery reaches a set value, the explosion-proof valve is opened, and substances sprayed from the interior of the single battery through the explosion-proof valve enter the accommodating cavity from the first opening; the cooling medium is capable of cooling the substance in the receiving cavity.

The battery pack according to the embodiment of the utility model has at least the following beneficial effects: the liquid cooling plate is provided with a plurality of cooling cavities and at least one accommodating cavity, and the cooling cavities are used for accommodating cooling media so as to radiate heat of the single batteries; when the single battery is out of control due to overhigh temperature, the pressure inside the single battery reaches the set value of the explosion-proof valve, and the explosion-proof valve is opened, so that the sprayed substances in the single battery enter the accommodating cavity from the first opening. In this way, substances of thermal runaway of the unit cells, such as gas and electrolyte, can enter the receiving chamber. In the prior art, when the single battery is out of control, the explosion-proof valve is opened, so that gas and electrolyte can spread around the adjacent single battery, thereby influencing the performance of the adjacent single battery and even causing danger. And when this application's battery cell thermal runaway, explosion-proof valve opens, and the material in its battery cell can enter into and hold the chamber in, and the cooling medium in the cooling chamber can also be for holding gaseous and the liquid cooling in the chamber to because battery cell spun material enters into and holds the chamber, consequently can not influence and spread on the adjacent battery cell. Specifically, the battery pack having the unit cells can effectively cool down the substances ejected from the explosion-proof valve by the unit cells, and prevent thermal runaway from spreading. Further, since the accommodation chamber and the cooling chamber are partitioned from each other in the width direction of the liquid cooling plate, two cooling chambers are provided on both sides of one accommodation chamber, respectively. Accordingly, the accommodation chamber may be located at an intermediate position in the liquid-cooling plate width direction, or the accommodation chamber may be located at an end position in the liquid-cooling plate width direction. Thus, the first opening of the accommodating cavity can correspond to a plurality of types of single batteries, so that the battery pack has high adaptability. Specifically, the battery pack can not only effectively cool down the substances ejected from the explosion-proof valve by the unit battery, but also prevent thermal runaway from spreading, and has high adaptability.

According to some embodiments of the utility model, the battery pack further comprises a box body, the box body is provided with a storage cavity, and the liquid cooling plate and the single battery are arranged in the storage cavity; the box still has exhaust passage and the gas vent of intercommunication each other, the liquid cooling board still be provided with hold the chamber intercommunication the second opening, the second opening with exhaust passage intercommunication, the gas vent is located the box is facing away from the one side surface of storage chamber.

According to some embodiments of the utility model, two ends of the liquid cooling plate are respectively connected to the cavity wall of the storage cavity.

According to the battery pack of some embodiments of the present utility model, the single battery is connected to the liquid cooling plate, the single battery and the liquid cooling plate are provided with a plurality of single batteries, two sides of each liquid cooling plate are respectively provided with a row of single batteries, the liquid cooling plate is provided with a plurality of first openings, and the explosion-proof valve of each single battery is opposite to one first opening.

According to some embodiments of the utility model, the liquid cooling plate comprises a first partition plate, the first partition plate divides the accommodating cavity into two mutually independent sub accommodating cavities, and the first opening is arranged on one side of the sub accommodating cavity away from the first partition plate.

According to some embodiments of the utility model, the battery pack further comprises a sealing member, the sealing member is provided with a third opening, two sides of the sealing member are respectively connected with the single battery and the liquid cooling plate, and the first opening and the explosion-proof valve are arranged opposite to the third opening.

According to some embodiments of the utility model, the liquid cooling plate includes a second separator, the receiving chamber and the cooling chamber are disposed at both sides of the second separator, respectively, the second separator includes a weak area and a surrounding area, the surrounding area is connected to the periphery of the weak area, and the thickness of the weak area is smaller than the thickness of the surrounding area.

According to the battery pack of some embodiments of the present utility model, the battery pack further includes a temperature adjusting plate, the explosion-proof valve is disposed at one end of the unit battery, the temperature adjusting plate is connected to a side portion of the unit battery, and the temperature adjusting plate is used for cooling or heating the unit battery.

A battery pack according to an embodiment of the second aspect of the present utility model includes:

the box body comprises a plurality of plates, wherein the plates jointly define a storage cavity, a plurality of cooling cavities and at least one containing cavity are formed in the plates, the cooling cavities and the containing cavities are mutually separated along the height direction of the plates, and two cooling cavities are respectively arranged on two sides of one containing cavity; the cooling cavity is used for storing cooling medium, and the plate is further provided with a first opening communicated with the accommodating cavity;

the battery cell with the box is connected, the battery cell set up in the storage chamber, the battery cell has the explosion-proof valve, the explosion-proof valve with first opening sets up relatively, the explosion-proof valve is configured as: when the pressure in the single battery reaches a set value, the explosion-proof valve is opened, and substances sprayed from the interior of the single battery through the explosion-proof valve enter the accommodating cavity from the first opening; the cooling medium is capable of cooling the substance in the receiving cavity.

The battery pack according to the embodiment of the utility model has at least the following beneficial effects: the plurality of plates together form a storage cavity capable of accommodating the single battery, and in addition, the plates are provided with a plurality of cooling cavities and at least one containing cavity, and the cooling cavities are used for storing cooling media so as to radiate heat for the single battery; when the single battery is out of control thermally due to overhigh temperature, the pressure inside the single battery reaches the set value of the explosion-proof valve, the explosion-proof valve is opened, substances sprayed out of the single battery from the explosion-proof valve enter the accommodating cavity from the first opening, and the cooling medium can cool the substances in the accommodating cavity. In this way, substances of thermal runaway of the unit cells, such as gas and electrolyte, can enter the receiving chamber. In the prior art, when the single battery is out of control, the explosion-proof valve is opened, so that gas and electrolyte can spread around the adjacent single battery, thereby influencing the performance of the adjacent single battery and even causing danger. And when this application's battery cell thermal runaway, explosion-proof valve opens, and the material in its battery cell can enter into and hold the chamber in, and the cooling medium in the cooling chamber can also be for holding the chamber cooling to because the material in the battery cell enters into and holds the chamber, consequently can not influence and spread on the adjacent battery cell. Specifically, the battery pack having the unit cells can effectively cool down the substances ejected from the explosion-proof valve by the unit cells, and prevent thermal runaway from spreading. Further, since the accommodation chamber and the cooling chamber are partitioned from each other in the height direction of the plate, two cooling chambers are provided on both sides of one accommodation chamber, respectively. Thus, the accommodation chamber may be located at an intermediate position in the plate height direction, or the accommodation chamber may be located at an end position in the plate height direction. Thus, the first opening of the accommodating cavity can correspond to a plurality of types of single batteries, so that the battery pack has high adaptability. Specifically, the battery pack can not only effectively cool down the substances ejected from the explosion-proof valve by the unit battery, but also prevent thermal runaway from spreading, and has high adaptability.

According to some embodiments of the utility model, the plate is further provided with a vent in communication with the receiving chamber, the vent being located on a side surface of the case facing away from the storage chamber.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic illustration of a battery pack according to some embodiments of the present utility model;

fig. 2 is an exploded view of a battery pack according to some embodiments of the present utility model;

FIG. 3 is a partial schematic view of a battery pack according to some embodiments of the present utility model;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

fig. 5 is a schematic view of a liquid cooling plate in a battery pack according to a first embodiment of the present utility model;

FIG. 6 is a schematic view of a liquid cooling plate in a battery pack according to a second embodiment of the present utility model;

fig. 7 is a schematic plan view of a second separator of a liquid cooling plate in a battery pack according to a first embodiment of the present utility model;

fig. 8 is a schematic view of a unit cell in a battery pack according to a first embodiment of the present utility model;

fig. 9 is a schematic view of a unit cell in a battery pack according to a second embodiment of the present utility model;

fig. 10 is a schematic view of a seal in a battery pack according to some embodiments of the utility model.

Reference numerals:

the battery pack 10, the case 100, the storage chamber 110, the vent passage 120, the main body 130, the cross member 140, the liquid cooling plate 200, the cooling chamber 210, the receiving chamber 220, the opening group 230, the first opening 240, the second opening 250, the first partition 260, the second partition 270, the weak area 280, the surrounding area 290, the unit cell 300, the explosion-proof valve 310, the sealing member 400, the third opening 410, and the vent valve 500.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present utility model, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1, in some embodiments, a battery pack 10 includes: a liquid cooling plate 200 and a single battery 300. The liquid cooling plate 200 has a plurality of cooling chambers 210 and at least one receiving chamber 220, the receiving chamber 220 and the cooling chambers 210 are separated from each other in a width direction of the liquid cooling plate 200, and two cooling chambers 210 are respectively provided at both sides of one receiving chamber 220. The liquid cooling plate 200 is further provided with a first opening 240 communicating with the accommodating chamber 220, and the cooling chamber 210 is configured to accommodate a cooling medium capable of cooling the substance in the accommodating chamber 220. When the liquid cooling plate 200 contacts with the unit battery 300, the cooling medium can radiate heat for the unit battery 300, so that the unit battery 300 is prevented from being excessively high in temperature. In addition, the unit cell 300 is connected to the liquid cooling plate 200, and the cooling chamber 210 may cool down the accommodating chamber 220.

Referring to fig. 8, the single battery 300 has an explosion-proof valve 310, and when the internal pressure of the battery is too high, the explosion-proof valve 310 automatically opens the valve to directly discharge the internal high-pressure gas, thereby achieving the purpose of explosion prevention. The structure of the explosion-proof valve 310 belongs to the prior art, and is not specifically described herein, the explosion-proof valve 310 is disposed opposite to the first opening 240, and the specific manner in which the explosion-proof valve 310 is disposed opposite to the first opening 240 is that the opening of the explosion-proof valve 310 is disposed opposite to the first opening 240, so that when the material in the single battery 300 is ejected from the opening of the explosion-proof valve 310, the material in the single battery 300 can enter the accommodating cavity 220 from the first opening 240.

The explosion proof valve 310 is configured to: when the pressure inside the unit cell 300 reaches a set value, the explosion-proof valve 310 is opened, and the substances ejected from the inside of the unit cell 300 through the explosion-proof valve 310 enter the accommodating chamber 220 from the first opening 240. Specifically, referring to fig. 4, arrows in fig. 4 illustrate flow paths of substances in the unit cell 300 when the unit cell 300 is thermally out of control. The liquid cooling plate 200 has a cooling chamber 210 and a receiving chamber 220, which are separated from each other, the cooling chamber 210 storing a cooling medium to thereby radiate heat from the unit cells 300; when thermal runaway occurs in the unit cell 300 due to the excessively high temperature, the pressure inside the unit cell 300 reaches the set value of the explosion-proof valve 310, the explosion-proof valve 310 is opened, and the substances ejected from the inside of the unit cell 300 through the explosion-proof valve 310 enter the accommodating chamber 220 from the first opening 240. As such, substances such as gas and electrolyte, which are thermally out of control, of the unit cell 300 may enter the receiving chamber 220. In the prior art, when the single battery 300 is out of control, the explosion-proof valve 310 is opened, so that gas and electrolyte can spread around the adjacent single battery 300, thereby affecting the performance of the adjacent single battery 300 and even causing danger. When the single battery 300 is in thermal runaway, the explosion-proof valve 310 is opened, substances in the single battery 300 can enter the accommodating cavity 220, the cooling medium in the cooling cavity 210 can cool the accommodating cavity 220, and the substances in the single battery 300 cannot influence and spread to the adjacent single battery 300 because the substances enter the accommodating cavity 220. Specifically, the battery pack 10 having the unit cells 300 can effectively cool down the substances ejected from the explosion-proof valve by the unit cells 300 and prevent the thermal runaway from spreading. Further, since the receiving chamber 220 and the cooling chamber 210 are partitioned from each other in the width direction of the liquid cooling plate 200, two cooling chambers 210 are provided at both sides of one receiving chamber 220, respectively. Accordingly, the accommodation chamber 220 may be located at an intermediate position in the width direction of the liquid cooling plate 200, or the accommodation chamber 220 may be located at an end position in the width direction of the liquid cooling plate 200. In this manner, the first opening 240 of the receiving chamber 220 may correspond to the plurality of types of unit batteries 300, so that the battery pack 10 has high adaptability. Specifically, the battery pack 10 can not only effectively cool down the substances ejected from the explosion-proof valve 310 by the unit battery 300, but also prevent thermal runaway from spreading, and has high suitability.

Referring to fig. 8 and 9, a plurality of different types of single batteries 300 are described below. Wherein the explosion-proof valve 310 is commonly provided on the top cover. The explosion-proof valve 310 of the unit cell 300 may be located at the middle position of the top cover, in which case the receiving chamber 220 may be provided at the middle position of the liquid cooling plate 200 to correspond to the explosion-proof valve 310. The explosion-proof valves 310 of the other unit cell 300 may be located at both ends of the top cover, in which case the receiving chambers 220 may be provided at both ends of the liquid cooling plate 200 to correspond to the explosion-proof valves 310. Referring to fig. 5 and 6, the liquid cooling plate 200 has two cooling chambers 210 and one receiving chamber 220, and the cooling plate 200 may have two cooling chambers 210 and one receiving chamber 220, and the two cooling chambers 210 are respectively located at the upper and lower ends of the one receiving chamber 220. I.e. in the vertical direction, the receiving chamber 220 is located in an intermediate position. The specific manner in which the liquid cooling plate 200 has the cooling chamber 210 and the accommodating chamber 220 separated from each other may be such that the liquid cooling plate 200 has one cooling chamber 210 and one accommodating chamber 220, and the cooling chamber 210 is located at one side of one accommodating chamber 220. For example, the receiving chamber 220 is on the left side and the cooling chamber 210 is on the right side. Alternatively, the receiving chamber 220 is on the right side and the cooling chamber 210 is on the left side. The variable positions of the cooling chamber 210 and the accommodating chamber 220 can make the liquid cooling plate 200 have a larger adaptability to match the arrangement of the unit cells 300 in the storage chamber 110 of the battery pack 10. Specifically, referring to fig. 6, 8 and 9, it can be seen that the explosion-proof valve 310 of different types of single batteries 300 can correspond to the first opening 240 of the accommodating cavity 220 of the liquid cooling plate 200, so that the battery pack 10 of the present application can adapt to different types of single batteries 300.

As mentioned above, since the accommodation chamber 220 is provided in the liquid cooling plate 200, it is possible to prevent the substances in the unit cells 300 from spreading to the adjacent unit cells 300 at the time of thermal runaway of the unit cells 300. When more substances are ejected from the thermal runaway of the single battery 300, the substances can be discharged out of the battery pack 10, i.e. in the external environment of the battery pack 10, so that the influence on the battery pack 10 is reduced and the safety performance is improved. Therefore, referring to fig. 3 and 4, arrows in fig. 4 illustrate flow paths of substances in the unit cell 300 when the unit cell 300 is thermally out of control. In some embodiments, the battery pack 10 further includes a case 100, the case 100 has a storage chamber 110, and the liquid cooling plate 200 and the unit battery 300 are disposed in the storage chamber 110. The case 100 further has an exhaust channel 120 and an exhaust port (the exhaust channel 120 is shown in fig. 1, and the dashed line in fig. 1 illustrates the exhaust channel 120), the liquid cooling plate 200 is further provided with a second opening 250 in communication with the accommodating cavity 220, the second opening 250 is in communication with the exhaust channel 120, and the exhaust port is located on a surface of the case 100 opposite to the storage cavity 110. The exhaust passage 120 communicates with the outside through an exhaust port. The flow path of the substances within the unit cell 300 when the unit cell 300 is thermally out of control is specifically described below. First, when thermal runaway occurs in the unit cell 300 due to the excessively high temperature, the pressure inside the unit cell 300 gradually increases, thereby reaching the set value of the explosion-proof valve 310. At this time, the explosion-proof valve 310 is opened, and substances such as gas and electrolyte in the unit cell 300 are ejected from the opening of the explosion-proof valve 310 and then enter the receiving chamber 220 through the first opening 240. After entering the accommodating chamber 220, since the accommodating chamber 220 communicates with the second opening 250, the substances in the unit cell 300 pass through the second opening 250 and thus enter the exhaust passage 120. Finally, the air is discharged to the outside through the air discharge passage 120.

Referring to fig. 1, in some embodiments, an exhaust valve 500 is disposed at the exhaust port of the exhaust channel 120, and the exhaust valve 500 can exhaust the gas in the substances of the unit cell 300, so as to prevent the electrolyte from being exhausted outside and pollute the environment. Alternatively, the battery pack 10 prevents the electrolyte from damaging the automobile when mounted on the automobile. Further, the exhaust valve 500 may be replaced with a relief valve. The exhaust valve 500 can exhaust the gas in the accommodating chamber 220, and the pressure relief valve can exhaust the gas in the accommodating chamber 220 when the gas exceeds the air pressure.

In some embodiments, the cell 300 also has a post, wherein the post may be disposed on one side of the cell 300 and the explosion-proof valve 310 is disposed on the opposite side of the cell 300 from the post. The post may be provided on the same side of the unit cell 300 as the explosion-proof valve 310. This way, the battery cell 300 can have a high adaptability.

Further, it is understood that the greater the strength of the battery pack 10, the less the battery pack 10 is affected when the battery pack 10 encounters a collision, impact, and drop. Therefore, the battery pack 10 can protect the unit cells 300 in the battery pack 10 due to high structural strength, and the battery pack 10 is not easily deformed. Therefore, the structural strength of the battery pack 10 can be improved by providing the cross members 140. Specifically, referring to fig. 3, in some embodiments, the case 100 includes a main body 130 and a beam 140, the main body 130 has a storage chamber 110, and the beam 140 is connected to a chamber wall of the storage chamber 110. The cross member 140 is coupled to the main body 130, thereby reinforcing the structural strength of the main body 130 and enabling the case 100 of the battery pack 10 to have high strength.

In some embodiments, the body 130 and the beam 140 are a unitary structure. The case 100 is manufactured by an integral molding process, and has high efficiency and high strength, and can meet the use requirements of the battery pack 10.

Referring to fig. 3, in some embodiments, two ends of the liquid cooling plate 200 are respectively connected to the walls of the storage chamber 110. Specifically, both ends of the liquid cooling plate 200 may be welded to the chamber walls of the storage chamber 110, respectively. The liquid cooling plate 200 can serve as the cross beam 140 of the box 100, and has the function of reinforcing the structural strength of the box 100. The liquid cooling plate 200 may also function to dissipate heat from the unit cells 300. In this way, compared with the case 100 in the battery pack 10 provided with the liquid cooling plate 200 in the prior art, the battery pack 10 in this embodiment can save the occupied space of the liquid cooling plate 200. In this way, the integration level and the space utilization rate of the battery pack 10 can be improved, so that more single batteries 300 can be placed in the storage cavity 110, and the energy density of the battery pack 10 can be improved.

The above-mentioned liquid cooling plate 200 may be used as the cross member 140 to improve the structural strength of the cabinet 100. The case where the battery pack 10 includes a plurality of unit batteries 300 and a plurality of liquid cooling plates 200 will be described below. Referring to fig. 2 and 5, in some embodiments, the unit cells 300 are connected to the liquid cooling plate 200, the unit cells 300 and the liquid cooling plate 200 are provided with a plurality of unit cells 300, two sides of each liquid cooling plate 200 are respectively provided with a row of unit cells 300, the liquid cooling plate 200 is provided with a plurality of first openings 240, and the explosion-proof valve 310 of each unit cell 300 is disposed opposite to one first opening 240. A row of unit cells 300 includes a plurality of unit cells 300. Four unit cells 300 are respectively disposed on both sides of one liquid cooling plate 200. That is, a row of unit cells 300 includes four unit cells 300. The liquid cooling plate 200 is provided with a plurality of opening groups 230, and the opening groups 230 include two first openings 240 respectively provided at both sides of the receiving chamber 220. Referring to fig. 2, there may be eight single batteries 300, four single batteries 300 are located at the left side of the liquid cooling plate 200, and four single batteries 300 are located at the right side of the liquid cooling plate 200. The liquid cooling plate 200 is provided with four opening groups 230 (the positions of the opening groups 230 can be referred to as fig. 5), and two first openings 240 of one opening group 230 are respectively located at two sides of the liquid cooling plate 200. The four first openings 240 on the left side of the liquid cooling plate 200 correspond to the explosion-proof valves 310 of the four unit batteries 300, respectively, and the four first openings 240 on the right side of the liquid cooling plate 200 correspond to the explosion-proof valves 310 of the four unit batteries 300, respectively. In this way, by providing the plurality of opening groups 230 through the liquid cooling plate 200, when the explosion-proof valve 310 of one single battery 300 among the plurality of single batteries 300 is opened, the substances in the single battery 300 enter the accommodating cavity 220, and the adjacent single battery 300 is not affected. In addition, not only can heat be simultaneously radiated to eight unit cells 300 by one liquid cooling plate 200, but also thermal runaway of one unit cell 300 can be prevented from spreading to surrounding unit cells 300 by one liquid cooling plate 200.

In addition, when the liquid cooling plate 200 is provided with a row of unit cells 300 at both sides thereof, the left unit cell 300 is thermally out of control, and when the substances in the left unit cell 300 are ejected, the substances may be ejected onto the opposite unit cell 300. I.e., the material in the left cell 300 is sprayed on the right cell 300. Thus, referring to fig. 5, in some embodiments, the liquid cooling plate 200 includes a first partition 260, the first partition 260 divides the accommodating cavity 220 into two independent sub-accommodating cavities, and the first opening 240 is disposed on a side of the sub-accommodating cavities facing away from the first partition 260. In this way, when the unit cell 300 located on one side of the liquid cooling plate 200 is thermally out of control, the substances inside thereof are not sprayed on the unit cell 300 on the opposite side.

The arrangement of the plurality of unit cells 300 in the storage chamber 110 is described below. Referring to fig. 5, in some embodiments, a plurality of unit cells 300 are arranged along the length direction of the liquid cooling plate 200, and a plurality of opening groups 230 are spaced apart. In the present embodiment, the unit cells 300 may be placed in the storage chamber 110 in a recumbent manner.

In some embodiments, the plurality of unit cells 300 are arranged in a row along the width direction of the liquid cooling plate 200, and the plurality of opening groups 230 are spaced apart. In the present embodiment, the unit cells 300 may be placed in the storage chamber 110 in a vertical and horizontal manner.

Further, in order to ensure that the material in the unit cell 300 is not overflowed to the outside of the unit cell 300 but is introduced into the receiving chamber 220 when the material in the unit cell 300 is introduced into the first opening 240 from the explosion-proof valve 310 when the unit cell 300 is thermally out-controlled. The seal 400 may be provided between the unit cell 300 and the liquid cooling plate 200. Specifically, referring to fig. 10, in some embodiments, the battery pack 10 further includes a sealing member 400, the sealing member 400 has a third opening 410, two sides of the sealing member 400 are respectively connected to the unit battery 300 and the liquid cooling plate 200, and the first opening 240 and the explosion-proof valve 310 are disposed opposite to the third opening 410. Wherein the seal 400 may be a high temperature resistant rubber. After the sealing member 400 is provided around the explosion-proof valve 310, it is possible to further secure the entry of the substances within the unit cell 300 into the receiving chamber 220.

Referring to fig. 7, in some embodiments, the liquid cooling plate 200 includes a second partition 270, the receiving chamber 200 and the cooling chamber 210 are disposed at both sides of the second partition 270, respectively, and the second partition 270 includes a weak area 280 and a surrounding area 290, the surrounding area 290 being connected to the periphery of the weak area 280, and the weak area 280 having a thickness smaller than that of the surrounding area 290. The cooling chamber 210 is provided therein with a flow passage, and the cooling medium may be water, which may flow in the flow passage or be stationary. The material of the liquid cooling plate 200 may be a metal material. The liquid cooling plate 200 has a cooling chamber 210 and a receiving chamber 220, the cooling chamber 210 and the receiving chamber 220 are partitioned by a second partition 270, and the second partition 270 may have a mechanical structure having a different thickness, for example, the second partition 270 includes a weak area 280 and a surrounding area 290, and the weak area 280 has a thickness smaller than that of the surrounding area 290. In this way, the weak area 280 is subjected to a large pressure under the action of high pressure and high temperature, and when the weak area 280 is not subjected to the pressure, the substances in the unit cell 300 may break through the weak area 280, thereby entering the cooling chamber 210 from the receiving chamber 220. When the weak area 280 breaks, the fluid in the cooling cavity 210 flows out in a large amount, so as to cool the exhaust of the unit battery 300, thereby greatly improving the cooling effect. In addition, the weakened area 280 may be formed of a brittle material that is easily broken by pressure.

Wherein, when the thermal runaway of the unit cell 300 does not occur, the temperature of the unit cell 300 may be managed by the temperature adjusting plate when the temperature of the unit cell 300 is high or when the temperature of the unit cell 300 is low. Specifically, in some embodiments, the battery pack 10 also includes a temperature adjustment plate. The explosion-proof valve 310 is disposed at one end of the unit cell 300, for example, the explosion-proof valve 310 is disposed at the top or bottom end of the unit cell 300. The temperature adjustment plate is attached to a side of the unit cell 300, such as the temperature adjustment plate is attached to a large or small surface of the unit cell 300. The temperature adjustment plate is used to cool or heat the unit cell 300. Specifically, hot water may be provided in the temperature adjustment plate so that the temperature adjustment plate may heat the unit cells 300 when the temperature of the unit cells 300 is low. Cold water may be disposed in the temperature adjusting plate, so that the temperature adjusting plate may radiate heat to the unit battery 300 when the temperature of the unit battery 300 is high.

In some embodiments, in order to make the temperature adjusting plate more effective in managing the temperature of the unit battery 300, a circulating medium may flow in the flow channel of the temperature adjusting plate. Specifically, the temperature adjusting plate is communicated with the outside, so that hot water or cold water can flow in the flow channel in the temperature adjusting plate, the flowing hot water can continuously heat the single battery 300, and the flowing cold water can continuously radiate heat to the single battery 300.

Referring to fig. 3, in some embodiments, the battery pack 10 includes: a case 100 and a unit cell 300. The case 100 includes a plurality of plates that collectively define a storage chamber 110. For example, four of the plates surround the side walls forming the storage cavity 110 and two of the plates surround the top and bottom walls forming the storage cavity 110. The inside of the plate has a plurality of cooling chambers 210 and at least one receiving chamber 220, the cooling chambers 210 and the receiving chambers 220 are separated from each other in the height direction of the plate, and two cooling chambers 210 are provided at both sides of one receiving chamber 220, respectively. The cooling chamber 210 is for storing a cooling medium, and the plate is further provided with a first opening 240 communicating with the receiving chamber 220. The unit cell 300 is connected with the case 100 and disposed in the storage chamber 110, and the unit cell 300 has an explosion-proof valve 310, the explosion-proof valve 310 being disposed opposite to the first opening 240. The explosion proof valve 310 is configured to: when the pressure inside the unit cell 300 reaches a set value, the explosion-proof valve 310 is opened, and the substance ejected from the inside of the unit cell 300 through the explosion-proof valve 310 enters the accommodating chamber 220 from the first opening 240, and the cooling medium can cool the substance in the accommodating chamber 220. Specifically, the plurality of plates collectively form a storage chamber 110 in which the unit cells 300 can be placed, and in addition, the plates have a cooling chamber 210 and a receiving chamber 220 that are separated from each other, the cooling chamber 210 being for storing a cooling medium, thereby radiating heat from the unit cells 300; when thermal runaway occurs in the unit cell 300 due to the excessively high temperature, the pressure inside the unit cell 300 reaches the set value of the explosion-proof valve 310, the explosion-proof valve 310 is opened, and the substances ejected from the inside of the unit cell 300 through the explosion-proof valve 310 enter the accommodating chamber 220 from the first opening 240. As such, substances such as gas and electrolyte, which are thermally out of control, of the unit cell 300 may enter the receiving chamber 220. In the prior art, when the single battery 300 is out of control, the explosion-proof valve 310 is opened, so that gas and electrolyte can spread around the adjacent single battery 300, thereby affecting the performance of the adjacent single battery 300 and even causing danger. When the single battery 300 is in thermal runaway, the explosion-proof valve 310 is opened, substances in the single battery 300 can enter the accommodating cavity 220, the cooling medium in the cooling cavity 210 can cool the accommodating cavity 220, and the substances in the single battery 300 cannot influence and spread to the adjacent single battery 300 because the substances enter the accommodating cavity 220. Specifically, the battery pack 10 having the unit cells 300 can effectively cool down the substances ejected from the explosion-proof valve by the unit cells 300 and prevent the thermal runaway from spreading. Further, since the receiving chamber 220 and the cooling chamber 210 are separated from each other in the height direction of the plate, two cooling chambers 210 are provided at both sides of one receiving chamber 220, respectively. Accordingly, the receiving chamber 220 may be located at an intermediate position in the plate height direction, or the receiving chamber 220 may be located at an end position in the plate height direction. In this manner, the first opening 240 of the receiving chamber 220 may correspond to the plurality of types of unit batteries 300, so that the battery pack 10 has high adaptability. Specifically, the battery pack 10 can not only effectively cool down the substances ejected from the explosion-proof valve 310 by the unit battery 300, but also prevent thermal runaway from spreading, and has high suitability.

In addition, in the above embodiment, since the cooling chamber 210 is provided in the plate, the case 100 of the battery pack 10 also has a function of cooling the unit cells 300. Thus, the battery pack 10 in the present embodiment does not need to provide the liquid cooling plate 200, so that more time is saved for placing the unit batteries 300, and the energy density of the battery pack 10 is improved.

In addition, the structure of the liquid cooling plate 200 in fig. 5 and 6 can be referred to in a manner that the plate has a plurality of cooling chambers 210 and at least one receiving chamber 220 inside. In the above embodiment, the plate may serve as the liquid cooling plate 200.

In some embodiments, the plate is further provided with an air vent in communication with the receiving chamber 220, the air vent being located on a side surface of the case 100 facing away from the storage chamber 110. The receiving chamber 200 communicates with the outside through the exhaust port to discharge the substances within the unit cell 300 to the outside. The flow path of the substances within the unit cell 300 when the unit cell 300 is thermally out of control is specifically described below. First, when thermal runaway occurs in the unit cell 300 due to the excessively high temperature, the pressure inside the unit cell 300 gradually increases, thereby reaching the set value of the explosion-proof valve 310. At this time, the explosion-proof valve 310 is opened, and substances such as gas and electrolyte in the unit cell 300 are ejected from the opening of the explosion-proof valve 310 and then enter the receiving chamber 220 through the first opening 240. After entering the accommodating chamber 220, since the accommodating chamber 220 communicates with the exhaust port, the substances in the unit cell 300 pass through the exhaust port and are discharged to the outside.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A battery pack, comprising:

the liquid cooling plate is provided with a plurality of cooling cavities and at least one containing cavity, the containing cavities and the cooling cavities are mutually separated along the width direction of the liquid cooling plate, and two cooling cavities are respectively arranged on two sides of one containing cavity; the cooling cavity is used for accommodating cooling medium, and the liquid cooling plate is further provided with a first opening communicated with the accommodating cavity;

a single cell having an explosion-proof valve disposed opposite the first opening, the explosion-proof valve configured to: when the pressure in the single battery reaches a set value, the explosion-proof valve is opened, and substances sprayed from the interior of the single battery through the explosion-proof valve enter the accommodating cavity from the first opening; the cooling medium is capable of cooling the substance in the receiving cavity.

2. The battery pack of claim 1, further comprising a case having a storage cavity, wherein the liquid cooling plate and the unit cells are both disposed within the storage cavity; the box still has exhaust passage and the gas vent of intercommunication each other, the liquid cooling board still be provided with hold the chamber intercommunication the second opening, the second opening with exhaust passage intercommunication, the gas vent is located the box is facing away from the one side surface of storage chamber.

3. The battery pack according to claim 2, wherein both ends of the liquid cooling plate are respectively connected to the chamber walls of the storage chamber.

4. The battery pack according to claim 1, wherein the single battery is connected to the liquid cooling plate, the single battery and the liquid cooling plate are provided in plurality, a row of single batteries is respectively provided on two sides of each liquid cooling plate, the liquid cooling plate is provided with a plurality of first openings, and the explosion-proof valve of each single battery is arranged opposite to one first opening.

5. The battery pack of claim 4, wherein the liquid cooling plate comprises a first partition dividing the receiving chamber into two mutually independent sub-receiving chambers, the first opening being disposed on a side of the sub-receiving chambers facing away from the first partition.

6. The battery pack of claim 1, further comprising a sealing member having a third opening, wherein both sides of the sealing member are connected to the unit cell and the liquid cooling plate, respectively, and wherein the first opening and the explosion-proof valve are disposed opposite to the third opening.

7. The battery pack according to claim 1, wherein the liquid cooling plate includes a second separator, the receiving chamber and the cooling chamber are disposed at both sides of the second separator, respectively, the second separator includes a weak area and a surrounding area, the surrounding area is connected to the periphery of the weak area, and the thickness of the weak area is smaller than the thickness of the surrounding area.

8. The battery pack according to claim 1, further comprising a temperature adjusting plate provided at one end of the unit cell, the temperature adjusting plate being connected to a side portion of the unit cell, the temperature adjusting plate being for cooling or heating the unit cell.

9. A battery pack, comprising:

the box body comprises a plurality of plates, wherein the plates jointly define a storage cavity, a plurality of cooling cavities and at least one containing cavity are formed in the plates, the cooling cavities and the containing cavities are mutually separated along the height direction of the plates, and two cooling cavities are respectively arranged on two sides of one containing cavity; the cooling cavity is used for storing cooling medium, and the plate is further provided with a first opening communicated with the accommodating cavity;

the battery cell with the box is connected, the battery cell set up in the storage chamber, the battery cell has the explosion-proof valve, the explosion-proof valve with first opening sets up relatively, the explosion-proof valve is configured as: when the pressure in the single battery reaches a set value, the explosion-proof valve is opened, and substances sprayed from the interior of the single battery through the explosion-proof valve enter the accommodating cavity from the first opening; the cooling medium is capable of cooling the substance in the receiving cavity.

10. The battery pack of claim 9, wherein the plate is further provided with a vent in communication with the receiving chamber, the vent being located on a side surface of the case facing away from the storage chamber.