CN118472486A - Battery Pack - Google Patents

Abstract

The application relates to the technical field of batteries, in particular to a battery pack, which comprises: a housing, in which a cavity is formed; the battery cell is arranged in the containing cavity; the side wall of the shell is provided with a first connecting port for conveying the insulating cooling medium into the accommodating cavity and a second connecting port for flowing out the insulating cooling medium; the pump body is provided with a first connecting port, the insulating cooling medium circularly flows in the accommodating cavity, and the insulating cooling medium can flow through a plurality of wall surfaces of each battery cell. Compared with the traditional heat dissipation mode of the water cooling plate, the battery pack provided by the application has the advantages that the fluidity of the insulating cooling medium is enhanced, the insulating cooling medium can flow through a plurality of wall surfaces of the battery cells, and the heat exchange surface of the insulating cooling medium and each battery cell is obviously increased, so that the heat dissipation effect on all the battery cells is obviously improved, the safety and the service life of the battery pack are improved, and when the battery pack is in thermal runaway, the thermal runaway can be prevented from spreading in time, and more serious consequences are avoided.

Description

Battery Pack

Technical Field

The present application relates to the field of battery technology, and in particular to a battery pack.

Background Art

At present, water cooling plates are usually used in battery packs for heat dissipation. Water cooling plates are heat exchangers that cool heat sources and control the temperature of the heat sources within the designed temperature range. The heat source (such as a battery cell) is in direct contact with the heat exchange surface of the water cooling plate, and the air gap is filled with thermal conductive glue to reduce thermal resistance and increase heat dissipation. The water cooling plate is usually composed of a nozzle and a cold plate body. The nozzle (also called a joint) includes two types: an inlet nozzle and an outlet nozzle. Usually, one in and one out. The cold plate body is closed on all sides and has a flow channel inside. The low-temperature cooling medium (such as a cooling medium or a refrigerant) enters the cold plate body through the inlet nozzle, flows in the flow channel and takes away the heat transmitted from the heat source. Finally, the heated cooling medium flows out through the outlet nozzle.

This commonly used water-cooling plate is placed at the bottom of the battery, and the space between the water-cooling plate and the battery is filled with thermally conductive glue. This configuration results in only one side of the battery being cooled by the water-cooling plate, resulting in a small heat exchange area, which affects the heat exchange power. The temperature gradient inside a single battery cell is large, and it is easy for the temperature at the bottom of the battery cell to be low and the temperature at the top of the battery cell to be high, which affects the life of the battery cell. In addition, the thermal conductivity coefficient of the thermally conductive glue of the inlet and outlet nozzles of the water-cooling plate of the battery lower shell and the flat plate flow channel plate of the battery inlet and outlet nozzles is small (1~2w/k/m), which increases the thermal resistance between the water-cooling plate and the battery, further reduces the cooling effect of the battery and increases the temperature gradient inside the single battery cell. Ultimately, the discharge power of the battery cell is limited, which also affects the life of the battery.

Summary of the invention

The purpose of the present application is to provide a battery pack to solve, to a certain extent, the technical problem that the existing battery pack in the prior art adopts a cooling method of a water cooling plate, which has a general cooling effect on the heat source and is likely to affect the life of the battery pack.

The present application provides a battery pack, comprising: a shell, wherein the interior of the shell forms a cavity;

A battery cell, wherein the number of the battery cells is multiple, and the multiple battery cells are arranged in the cavity;

The side wall of the shell is provided with a first connection port for conveying an insulating cooling medium into the cavity, and the side wall of the shell is also provided with a second connection port for allowing the insulating cooling medium to flow out;

A pump body is connected to the first connection port, and the pump body is used to pump the insulating cooling medium into the cavity so that the insulating cooling medium circulates in the cavity, and the insulating cooling medium can flow through multiple wall surfaces of each of the battery cells.

In the above technical solution, further, a first partition cavity and a second partition cavity are arranged in the shell, and the first partition cavity and the second partition cavity are respectively communicated with the containing cavity; one of the first partition cavity and the second partition cavity is communicated with the first connecting port, and the other of the first partition cavity and the second connecting port is communicated with the second connecting port;

Electrical components are arranged in the first partition cavity and the second partition cavity.

In any of the above technical solutions, further, the battery pack further includes a reversing valve, and the reversing valve is arranged between the first partition chamber and the second partition chamber;

The reversing valve comprises: a valve body and a valve core, wherein the valve core is rotatably arranged in the valve body;

The valve core has a first position and a second position in the valve body, and a guide cavity is provided in the valve body. When the valve core is in the first position, the first connecting port is communicated with the first separating cavity through the guide cavity; when the valve core is in the second position, the first connecting port is communicated with the second separating cavity through the guide cavity.

In any of the above technical solutions, further, the reversing valve further includes a plurality of guide plates, each of which is provided with a diversion hole; when the valve core is in the first position, the valve core is in contact with some of the guide plates among the plurality of guide plates;

When the valve core switches from the first position to the second position, the valve core is in contact with another part of the guide plates among the plurality of guide plates;

When the valve core is fitted onto the guide plate, the valve core can cover the diversion hole on the guide plate.

In any of the above technical solutions, further, the valve core includes:

A fixed shaft cylinder, wherein the fixed shaft cylinder is arranged in the valve body;

A first valve plate, wherein the first valve plate is disposed on the fixed shaft cylinder and connected to an inner wall surface of the valve body;

The second valve plate is arranged on the fixed shaft cylinder and connected to the inner wall surface of the valve body; the second valve plate and the first valve plate are arranged on the same straight line.

In any of the above technical solutions, further, the reversing valve also includes:

A bearing plate, wherein the bearing plate is coaxially arranged with the valve body in the valve body, the flow guide cavity is formed above the bearing plate, and the bearing plate is provided with a drainage hole;

A driving member, wherein a mounting cavity is formed below the bearing plate, and the driving member is disposed in the mounting cavity; the driving member has a driving shaft, and the driving shaft is connected to the fixed shaft cylinder;

A first sealing cover, the first sealing cover is arranged to cover the opening of the diversion cavity;

A second sealing cover is disposed on the opening of the installation cavity.

In any of the above technical solutions, further, the battery pack also includes:

a first connecting pipe, the first connecting pipe being passed through the first connecting port and being in communication with the diversion cavity;

a second connecting pipe, the second connecting pipe being passed through the second connecting port, one end of the second connecting pipe being connected to the drainage hole;

a first inner tube, the guide cavity and the first separation cavity are in communication with each other through the first inner tube;

The second inner tube is connected with the second dividing chamber through the second inner tube.

In any of the above technical solutions, further, the battery pack also includes a limiting bracket, and the limiting bracket includes:

Substrate;

a baffle, the baffle being disposed at an end of the substrate;

There are multiple limit bars, and the multiple limit bars are arranged on the substrate at equal intervals along the length direction of the substrate. Limit slots are formed on both sides of each limit bar, and one battery cell is arranged in each limit slot.

In any of the above technical solutions, further, the battery cell has a rectangular parallelepiped structure, and the width of the limit slot is adapted to the thickness of the battery cell;

The length of the battery cell extends along the width direction of the substrate, and the length of the battery cell is greater than the width of the substrate;

The width direction of the battery core is in the same direction as the width direction of the baffle, and the width of the battery core is greater than the width of the baffle.

In any of the above technical solutions, further, the housing includes:

Protective frame;

A cover plate, the cover plate being arranged on the protection frame; a plurality of exhaust valves being arranged at intervals on the cover plate;

The bottom plate is arranged on the protection frame, the cover plate and the bottom plate are arranged facing each other, and the cover plate, the bottom plate and the protection frame jointly define the cavity.

Compared with the prior art, the beneficial effects of this application are:

The battery pack provided in the present application includes: a shell, the interior of the shell forms a cavity; a plurality of battery cells, and the plurality of battery cells are arranged in the cavity; the side wall of the shell is provided with a first connection port for conveying an insulating cooling medium into the cavity, and the side wall of the shell is also provided with a second connection port for allowing the insulating cooling medium to flow out; a pump body, the pump body is connected to the first connection port, the pump body is used to pump the insulating cooling medium into the cavity, so that the insulating cooling medium circulates in the cavity, and the insulating cooling medium can flow through multiple wall surfaces of each battery cell.

The battery pack provided by the present application enhances the fluidity of the insulating cooling medium compared to the traditional water-cooling plate heat dissipation method, and the insulating cooling medium can flow through multiple walls of the battery cell, significantly increasing the heat exchange surface between the insulating cooling medium and each battery cell, thereby significantly improving the heat dissipation effect of all battery cells, improving the safety and service life of the battery pack, and when thermal runaway occurs in the battery pack, it can also promptly prevent the thermal runaway from spreading to avoid more serious consequences.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

FIG2 is a schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present application;

FIG3 is a schematic diagram of a partial structure of a battery pack provided in an embodiment of the present application;

FIG4 is a schematic structural diagram of a position limiting bracket of a battery pack provided in an embodiment of the present application;

FIG5 is another schematic diagram of the structure of the limiting bracket of the battery pack provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a reversing valve of a battery pack provided in an embodiment of the present application;

FIG. 7 is another schematic diagram of the structure of the reversing valve of the battery pack provided in an embodiment of the present application;

FIG8 is another schematic diagram of the structure of the reversing valve of the battery pack provided in an embodiment of the present application;

FIG9 is a schematic diagram of a flow path of an insulating cooling medium flowing along a first direction in a battery pack provided by an embodiment of the present application;

FIG10 is a schematic diagram of the flow path of the insulating cooling medium flowing along the second direction in the battery pack provided in an embodiment of the present application.

Reference numerals:

1-shell, 101-protection frame, 102-bottom plate, 103-cover plate, 104-exhaust valve, 2-battery core, 3-first chamber, 4-second chamber, 5-first partition chamber, 6-second partition chamber, 7-first partition beam, 8-second partition beam, 9-reversing valve, 901-valve body, 902-carrying plate, 903-valve core, 9031-first valve plate, 9032-second valve plate, 9033-fixed shaft cylinder, 904-driving member, 905-guiding chamber, 906-installation chamber, 907 -first inner tube, 908-second inner tube, 909-first guide plate, 910-second guide plate, 911-third guide plate, 912-fourth guide plate, 913-diverter hole, 914-sealing gasket, 915-first connecting tube, 916-second connecting tube, 917-drainage hole, 918-first sealing cover, 919-second sealing cover, 10-limiting bracket, 1001-base plate, 1002-limiting strip, 1003-baffle, 1004-limiting slot, 11-BMS, 12-BDU.

DETAILED DESCRIPTION

The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

A battery pack according to an embodiment of the present application will be described below with reference to FIGS. 1 to 10 .

Referring to Figures 1 to 10, an embodiment of the present application provides a battery pack, which includes a shell 1 and a battery cell 2, wherein the number of battery cells 2 is multiple, and a cavity and a first partition cavity 5 and a second partition cavity 6 connected to the cavity are formed inside the shell 1, and multiple battery cells 2 are arranged in the cavity. The side wall of the shell 1 is provided with a first connection port and a second connection port, the first connection port is used to input an insulating cooling medium into the cavity, and the second connection port is used to output the insulating cooling medium in the shell 1, so that the insulating cooling medium can circulate in the cavity, and the insulating cooling medium can flow through each battery cell 2 during the flow process and contact multiple wall surfaces of the battery cell 2, thereby cooling each battery cell 2. Compared with traditional liquid cooling plates, this heat dissipation method increases the cold area of each battery cell 2, thereby significantly improving the overall cooling and heat dissipation effect of the battery pack, thereby improving the safety and overall life of the battery pack.

It should be noted that the first connection port is connected to a pump body (not shown in the figure), which is arranged outside the battery pack and connected to the first connection port. When driven by the pump body, the pump body can transport an insulating cooling medium into the cavity and make the insulating cooling medium circulate into the shell 1 and out of the shell 1.

Specifically, the shell 1 includes: a protective frame 101, a bottom plate 102 and a cover plate 103, wherein the bottom plate 102 is arranged at the bottom port of the protective frame 101. Preferably, the bottom plate 102 and the protective frame 101 have an integrated structure, and there is good sealing between the two. The cover plate 103 is covered on the upper end opening of the protective frame 101, so that multiple battery cells 2 and other necessary components included in the battery pack are encapsulated in the shell 1. Preferably, the connection between the cover plate 103 and the protective frame 101 can be welding to ensure the sealing between the cover plate 103 and the protective frame 101, so that a cavity with sealing conditions is formed inside the shell 1 to avoid leakage of the insulating cooling medium. Preferably, the lower surface of the bottom plate 102 is provided with reinforcing ribs, and the bottom plate 102 is specifically a stamping plate provided with reinforcing ribs. The thickness of the stamping plate is preferably 2~5mm. The bottom plate 102 can also use a profile with a total height of 5~15mm to support and fix the battery cell 2.

Preferably, in this embodiment, the insulating cooling medium is a common insulating cooling medium in the prior art, which may be but is not limited to polyol ethylene glycol, etc., and has good insulation and thermal conductivity.

Furthermore, the battery pack also includes an exhaust valve 104, and the number of the exhaust valves 104 is multiple. The multiple exhaust valves 104 are arranged at intervals on the cover plate 103, and the cover plate 103 is provided with multiple exhaust holes, and each exhaust hole is correspondingly provided with an exhaust valve 104. When the battery cell 2 has thermal runaway, the battery cell 2 will generate gas, and the temperature and pressure around it will also change, so that the insulating cooling medium around the battery cell 2 with thermal runaway will evaporate or boil to generate gas, and the pressure inside the shell 1 will also change. The gas generated from various aspects will float upward, and the exhaust valve 104 is in a high position. After these gases flow to the vicinity of the exhaust valve 104, they will rush open the exhaust valve 104, thereby relieving the pressure in the internal environment of the shell 1 to prevent the battery pack from bursting or exploding.

It should be noted that inside the shell 1, each battery cell 2 is immersed in an insulating cooling medium, which can but does not have to immerse each battery cell 2. The exhaust valve 104 is set on the cover plate 103, rather than being set on the frame beam as traditionally, so that when thermal runaway occurs in the battery cell 2, the insulating cooling medium will not flow away through the opened exhaust valve 104, but will remain in the shell 1, thereby curbing the thermal runaway.

Preferably, each exhaust valve 104 is fixed to the exhaust port of the cover plate 103 by an elastic connecting member. The elastic connecting member can specifically be a torsion spring with torsion arms at both ends, one of which is connected to the cover plate 103, and the other is connected to the exhaust valve 104, so that in the absence of external force, the preload force of the torsion spring can fix the exhaust valve 104 at the exhaust port, thereby enhancing the stability and sealing of the exhaust valve 104.

Furthermore, the battery pack also includes a first partition beam 7 and a second partition beam 8, both of which are arranged in the shell 1. The length of the first partition beam 7 extends along the width direction of the protection frame 101, and the two ends of the first partition beam 7 do not contact the inner wall of the protection frame 101, so that the insulating cooling medium can flow through. The second partition beam 8 is arranged perpendicular to the first partition beam 7, and the two are arranged in a T-shape. The first partition beam 7 divides the cavity into two parts, namely the first cavity 3 and the second cavity 4. The volume of the first cavity 3 is greater than that of the second cavity 4. The first cavity 3 is used to accommodate the battery cell 2, and the second cavity 4 is used to accommodate the necessary components of the battery pack such as BMS11 and BDU12.

The second partition beam 8 is disposed in the second cavity 4, and the second partition beam 8 divides the second cavity 4 into a first partition cavity 5 and a second partition cavity 6 which are independent of each other. In this embodiment, the first connection port is disposed at a position of the side wall of the protection frame 101 corresponding to the first partition cavity 5, and the second connection port is disposed at a position of the side wall of the protection frame 101 corresponding to the second partition cavity 6. Preferably, the above-mentioned BDU 12 is disposed in the first partition cavity 5, and the insulating cooling medium flowing in through the first connection port can flow through the BDU 12, thereby cooling the BDU 12. The above-mentioned BMS 11 is disposed in the second partition cavity 6, and the insulating cooling medium flowing back to the second connection port can flow through the BMS 11, thereby cooling the BMS 11.

Furthermore, the battery pack also includes a limiting bracket 10. In the present embodiment, the number of the limiting brackets 10 is at least one, and each limiting bracket 10 can fix a plurality of battery cells 2. The plurality of battery cells 2 are distributed in rows along the same straight line on the limiting bracket 10. The number of limiting brackets 10 depends on the number of battery cells 2 used in the battery pack. Preferably, in the present embodiment, the number of limiting brackets 10 may be but is not limited to two, and the plurality of battery cells 2 are divided into two rows and fixed in the cavity by two limiting brackets 10. Of course, the number of limiting brackets 10 can also be adaptively configured according to the total number of battery cells 2 and the number of rows in which the battery cells 2 are arranged.

The limiting bracket 10 specifically includes a substrate 1001 and a limiting bar 1002, a baffle 1003 is provided at one end of the substrate 1001, another baffle 1003 is provided at the other end of the substrate 1001, the number of the limiting bars 1002 is multiple, and the multiple limiting bars 1002 are arranged at equal intervals along the length of the substrate 1001, any two adjacent limiting bars 1002 are arranged in parallel, and the first limiting bar 1002 and the baffle 1003, and the last limiting bar 1002 and the baffle 1003 are also parallel and spaced, and a limiting slot 1004 for installing the battery cell 2 is formed between any two adjacent limiting bars 1002 and between the limiting bar 1002 and the baffle 1003, The width of the positioning slot 1004 is matched with the thickness of the battery cell 2. Preferably, the inner wall surface of the positioning slot 1004 is coated with a layer of structural glue. The battery cell 2 is placed in each positioning slot 1004 and the structural glue is fixed to bond the battery cell 2 to the positioning bracket 10. The fixed battery cell 2 can be installed on the bottom plate 102 of the shell 1 together with the positioning slot 1004, and the baffles 1003 at both ends of the substrate 1001 can clamp the battery cell 2 to ensure the stability of the battery cell 2 in a stable state during the transfer process and after being installed in the cavity. Preferably, each battery cell 2 is fixed to the upper plate surface of the bottom plate 102 by structural glue.

Preferably, the battery cell 2 has a rectangular structure, the length of the battery cell 2 extends along the width direction of the substrate 1001, and the length of the battery cell 2 is greater than the width of the substrate 1001. Preferably, as shown in Figure 4, the baffle 1003 is arranged at the end of the upper surface of the substrate 1001, the length of the baffle 1003 extends along the width direction of the substrate 1001, the width direction of the baffle 1003 is perpendicular to the length direction of the substrate 1001, the width of the baffle 1003 extends in the same direction as the width of the battery cell 2, and the width of the baffle 1003 is smaller than the width of the battery cell 2, and the width of the baffle 1003 is 30% to 80% of the width of the battery cell 2. Such parameter design reduces the wrapping of the battery cell 2 by the limiting bracket 10 and increases the contact area between the battery cell 2 and the cooling insulating medium.

More preferably, the width of the limiting strip 1002 is 1-10 mm, so that a gap of 1-10 mm is formed between any two adjacent battery cells 2 , thereby allowing the insulating cooling medium to flow through the large surface of each battery cell 2 .

It should be noted that after the limiting bracket 10 is installed together with the battery cell 2 into the shell 1, a gap flow channel is formed between the upper surface of each battery cell 2 and the inner wall surface of the cover plate 103, and the insulating cooling medium can flow in the gap flow channel. Preferably, the height of the gap flow channel is 1-5 mm. More preferably, when the number of battery cells 2 arranged in the shell 1 is more than one row, the battery cells 2 in two adjacent rows are arranged at intervals, so that the insulating cooling medium flowing into the shell 1 can flow through each battery cell 2 except for one side wall surface fixed to the bottom plate 102. The other five wall surfaces of the battery cell 2 can contact with the insulating cooling medium. Due to the existence of gap spaces such as gaps between the battery cells 2 and the gap flow channel, the insulating cooling medium can be effectively prevented from flowing into the shell 1. The cooling medium can force convection heat exchange on the battery cell 2, take away the heat generated by the normal operation or thermal runaway of the battery cell 2, so that the battery cell 2 is in a suitable working stability and prevents the occurrence of heat spread (the boiling point of the insulating cooling oil is much lower than the thermal runaway temperature, and the insulating cooling medium does not contain oxygen. When a battery cell 2 has a thermal runaway, the thermal runaway itself will be controlled or even quickly eliminated. The insulating cooling medium can effectively prevent the thermal runaway from spreading to other battery cells 2 as an insulating barrier. It should be noted that the battery pack provided by the present application reduces the need for setting a water cooling plate, so that the thickness of the battery pack in the Z direction can be reduced by 4-10 mm, which is more conducive to the flattened design of the battery pack and increases the ground clearance of the battery.

Furthermore, the battery pack further includes a reversing valve 9, which is disposed between one end of the second partition beam 8 and the protective frame 101, and the reversing valve 9 and the second partition beam 8 jointly separate a first partition chamber 5 and a second partition chamber 6 which are independent of each other. Specifically, the reversing valve 9 includes a valve body 901, a valve core 903 and a driving member 904, wherein the valve core 903 is rotatably disposed in the valve body 901, and the driving member 904 is disposed at the bottom of the valve body 901, and is used to drive the valve core 903 to rotate in the valve body 901.

Furthermore, the valve body 901 has a cylindrical structure with openings at both ends and a hollow interior. A bearing plate 902 is arranged in the valve body 901. The edge of the bearing plate 902 is connected to the inner wall surface of the valve body 901, and the bearing plate 902 is coaxially arranged with the valve body 901. The bearing plate 902 divides the internal space of the valve body 901 into two parts, and a guide cavity 905 is formed on one side of the bearing plate 902. A mounting cavity 906 is installed on the other side of the bearing plate 902. The driving member 904 is arranged in the mounting cavity 906. The driving member 904 can specifically be a motor. The driving member 904 has a driving shaft. The driving shaft passes through the bearing plate 902 and is connected to the valve core 903, thereby driving the valve core 903 to rotate.

Furthermore, the side wall of the flow guiding cavity 905 is provided with a first inner tube 907 and a second inner tube 908, wherein the first inner tube 907 extends toward the first partition cavity 5 and is located in the first partition cavity 5, and the second inner tube 908 extends toward the second partition cavity 6 and is located in the second partition cavity 6. The side wall of the flow guiding cavity 905 is also provided with a first connecting tube 915 and a second connecting tube 916, wherein the first connecting tube 915 is connected to the first connecting port to input the insulating cooling medium into the flow guiding cavity 905, and the second connecting tube 916 is connected to the second connecting port to output the insulating cooling medium.

Four guide plates are arranged in the guide cavity 905, namely a first guide plate 909, a second guide plate 910, a third guide plate 911 and a fourth guide plate 912. The four guide plates are arranged at intervals along the circumferential direction of the axis of the valve body 901. The width of each guide plate extends along the radial direction of the guide cavity 905. Taking the first guide plate 909 as an example, one of the two side edges of the first guide plate 909 distributed along the radial direction of the valve body 901 is connected to the inner wall of the guide cavity 905, and the other of the two side edges extends toward the center position of the valve core 903. Furthermore, a diverter hole 913 is opened on the first guide plate 909, and the diverter hole runs through the two side plate surfaces of the first guide plate 909. The structure and connection method of the four guide plates are the same. Accordingly, a diverter hole 913 is opened on each guide plate, which can be fully understood by those skilled in the art and will not be described one by one here. In conjunction with Figure 7, four guide plates are installed according to the following rules: the first guide plate 909 and the second guide plate 910 are vertically distributed, the first guide plate 909 and the third guide plate 911 are staggered and distributed in parallel, the first guide plate 909 and the fourth guide plate 912 are vertically distributed, the second guide plate 910 and the third guide plate 911 are vertically distributed, the second guide plate 910 and the fourth guide plate 912 are staggered and distributed in parallel, and the third guide plate 911 and the fourth guide plate 912 are vertically distributed.

The valve core 903 includes a fixed shaft cylinder 9033, a first valve plate 9031 and a second valve plate 9032, wherein the fixed shaft cylinder 9033 is connected to the driving shaft of the driving member 904, and the valve core 903 has a first position and a second position in the guide chamber 905. When the driving member 904 drives the valve core 903 to rotate, the valve core 903 can switch between the first position and the second position. Preferably, the rotation angle of the valve core 903 is 90°. The first valve plate 9031 and the second valve plate 9032 are symmetrically arranged on both sides of the fixed shaft cylinder 9033, and the first valve plate 9031 is located between the first guide plate 909 and the fourth guide plate 912. During the movement of the valve core 903, the first valve plate 9031 can alternately fit with the first guide plate 909 and the fourth guide plate 912 to cover the diverter hole 913 on the first guide plate 909 or the fourth guide plate 912. Similarly, the second valve plate 9032 is located between the second guide plate 910 and the third guide plate 911. During the movement of the valve core 903, the second valve plate 9032 can alternately fit with the second guide plate 910 or the third guide plate 911 to block the diverter hole 913 on the second guide plate 910 or the third guide plate 911. Preferably, each guide plate is provided with a diverter hole 913, and each diverter hole 913 is provided with an annular sealing gasket 914 to enhance the sealing effect between the guide plate and the diverter hole 913 when the guide plate blocks the diverter hole 913.

Preferably, a drainage hole 917 is provided on the supporting plate 902, and the drainage hole 917 is specifically arranged on the plate surface of the supporting plate 902 located between the third guide plate 911 and the fourth guide plate 912. A connecting elbow is provided at one end of the second connecting pipe 916, and the connecting elbow is connected to the drainage hole 917. The second connecting pipe 916 is arranged in the installation cavity 906, and the end of the second connecting pipe 916 away from the connecting elbow passes through the side wall of the installation cavity 906 and is connected to the second connecting port. Such an arrangement makes the drainage hole 917 at a low position relative to the first connecting pipe 915, which can speed up the discharge of the insulating cooling medium and avoid the accumulation of the insulating cooling medium in the guide cavity 905.

Furthermore, the reversing valve 9 also includes a first cover 918 and a second cover 919 . The first cover 918 is disposed on the opening of the flow guide cavity 905 , and the second cover 919 is disposed on the opening of the installation cavity 906 .

As shown in FIG7 , in the battery pack provided by the present application, when the valve core 903 is in the first position, the first valve plate 9031 is attached to the second guide plate 910 and blocks the diverter hole 913 on the second guide plate 910, and the second valve plate 9032 is attached to the fourth guide plate 912 and blocks the diverter hole 913 on the fourth guide plate 912. At the same time, the diverter hole 913 on the first guide plate 909 and the diverter hole 913 on the third guide plate 911 are in an open state. After the pump body is started, the insulating cooling medium flowing into the guide cavity 905 through the first connecting pipe 915 flows to the first partition cavity 5 through the diverter hole 913 on the first guide plate 909 and the first inner tube 907 in turn, flows to the first partition cavity 5, flows through the BDU12 in the first partition cavity 5, and then flows to the first cavity 3, and flows through each battery cell 2. The insulating cooling medium in the second cavity 4 The mass flows back to the second partition chamber 6 and flows through the BMS11 in the second partition chamber 6, and then the insulating cooling medium flows out of the guide chamber 905 through the second inner tube 908, the diverter hole 913 on the third guide plate 911, the drainage hole 917 and the second connecting tube 916 in sequence, thereby forming a circulation path along the first direction (as shown by the arrow in Figure 9). During this circulation process, the insulating cooling medium dissipates heat and cools each battery cell 2 and the BDU12, BMS11 and other necessary components not shown in the battery pack arranged in the first partition chamber 5 and the second partition chamber 6, so that the BDU12, BMS11 and other necessary components not shown are always operated in a suitable temperature environment, which significantly improves the overall heat dissipation effect of the battery pack, thereby effectively increasing the life of the battery pack and reducing the risk of thermal runaway.

The driving member 904 drives the valve core 903 to rotate 90°, and drives the valve core 903 to switch from the first position to the second position. At this time, the first valve plate 9031 is attached to the first guide plate 909 and blocks the diverter hole 913 on the first guide plate 909, and the second valve plate 9032 is attached to the third guide plate 911 and blocks the diverter hole 913 on the third guide plate 911. At this time, after the pump body is started, the insulating cooling medium flowing in through the first connecting pipe 915 flows through the diverter hole 913 on the second guide plate 910 to the second inner pipe 908, and then flows into the second partition chamber 6. , the insulating cooling medium flows through the BMS11 and then flows into the first chamber 3. After dissipating the heat for each battery cell 2, the insulating cooling medium flows back to the first partition chamber 5 and flows through the BDU12 in the first partition chamber 5. Then, the insulating cooling medium flows into the guide chamber 905 through the first inner tube 907, and then flows to the drainage hole 917 and the second connecting pipe 916 through the diverter hole 913 on the fourth guide plate 912, and finally flows out of the reversing valve 9, thereby forming a circulation path along the second direction (as shown by the arrow in FIG. 10 ), and completing the switching of the insulating cooling medium flow path.

It should be noted that since each diversion hole 913 is provided with a sealing gasket 914, the first valve plate 9031 and the second valve plate 9032 can ensure the sealing effect of the corresponding diversion hole 913, avoiding accidental diversion, interruption and mixing of the insulating cooling medium.

Preferably, the pump body is also connected to a heat exchange device for cooling the returning insulating cooling medium.

It should be further explained that the drive member 904 can be set to periodically drive the valve core 903 to rotate, thereby realizing the periodic switching of the flow path of the insulating cooling medium, so that all the battery cells 2 and all the electrical components are under suitable temperature conditions and continue to operate, and can ensure the uniformity of the temperature between each battery cell 2 and the electrical components, reduce the temperature gradient, and avoid the temperature difference caused by the different heat exchange time and intensity of the insulating cooling medium in the inflow path and the outflow path, which leads to the existence of temperature difference in the battery cells 2 or electrical components at different positions. The periodic switching of the flow path of the insulating cooling medium can significantly ensure that the temperature of the battery cells 2 and electrical components at each position remains highly uniform, thereby further improving the safety and service life of the battery pack.

To sum up, the battery pack provided by the present application enhances the fluidity of the insulating cooling medium compared to the traditional water-cooled plate heat dissipation method, and the insulating cooling medium can flow through multiple wall surfaces of the battery cell 2, significantly increasing the heat exchange surface between the insulating cooling medium and each battery cell 2, thereby significantly improving the heat dissipation effect of all battery cells 2, and improving the safety and service life of the battery pack. When thermal runaway occurs in the battery pack, it can also promptly prevent the thermal runaway from spreading, avoiding more serious consequences.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A battery pack, comprising: A housing, wherein the interior of the housing forms a cavity; A battery cell, wherein the number of the battery cells is multiple, and the multiple battery cells are arranged in the cavity; The side wall of the shell is provided with a first connection port for conveying an insulating cooling medium into the cavity, and the side wall of the shell is also provided with a second connection port for allowing the insulating cooling medium to flow out; A pump body is connected to the first connection port, and the pump body is used to pump the insulating cooling medium into the cavity so that the insulating cooling medium circulates in the cavity, and the insulating cooling medium can flow through multiple wall surfaces of each of the battery cells. 2. The battery pack according to claim 1, characterized in that a first partition cavity and a second partition cavity are provided in the shell, the first partition cavity and the second partition cavity are communicated with the containing cavity respectively; one of the first partition cavity and the second partition cavity is communicated with the first connecting port, and the other of the first partition cavity and the second connecting port is communicated with the second connecting port; Electrical components are arranged in the first partition cavity and the second partition cavity. 3. The battery pack according to claim 2, characterized in that the battery pack further comprises a reversing valve, wherein the reversing valve is disposed between the first partition chamber and the second partition chamber; The reversing valve comprises: a valve body and a valve core, wherein the valve core is rotatably arranged in the valve body; The valve core has a first position and a second position in the valve body, and a guide cavity is provided in the valve body. When the valve core is in the first position, the first connecting port is communicated with the first separating cavity through the guide cavity; when the valve core is in the second position, the first connecting port is communicated with the second separating cavity through the guide cavity. 4. The battery pack according to claim 3, characterized in that the reversing valve further comprises a plurality of guide plates, each of which is provided with a diversion hole; when the valve core is in the first position, the valve core is in contact with some of the guide plates among the plurality of guide plates; When the valve core switches from the first position to the second position, the valve core is in contact with another part of the guide plates among the plurality of guide plates; When the valve core is fitted onto the guide plate, the valve core can cover the diversion hole on the guide plate. 5. The battery pack according to claim 4, wherein the valve core comprises: A fixed shaft cylinder, wherein the fixed shaft cylinder is arranged in the valve body; A first valve plate, wherein the first valve plate is disposed on the fixed shaft cylinder and connected to an inner wall surface of the valve body; The second valve plate is arranged on the fixed shaft cylinder and connected to the inner wall surface of the valve body; the second valve plate and the first valve plate are arranged on the same straight line. 6. The battery pack according to claim 5, characterized in that the reversing valve further comprises: A bearing plate, wherein the bearing plate is coaxially arranged with the valve body in the valve body, the flow guide cavity is formed above the bearing plate, and the bearing plate is provided with a drainage hole; A driving member, wherein a mounting cavity is formed below the bearing plate, and the driving member is disposed in the mounting cavity; the driving member has a driving shaft, and the driving shaft is connected to the fixed shaft cylinder; A first sealing cover, the first sealing cover is arranged to cover the opening of the diversion cavity; A second sealing cover is disposed on the opening of the installation cavity. 7. The battery pack according to claim 6, characterized in that the battery pack further comprises: a first connecting pipe, the first connecting pipe being passed through the first connecting port and being in communication with the diversion cavity; a second connecting pipe, the second connecting pipe being passed through the second connecting port, one end of the second connecting pipe being connected to the drainage hole; a first inner tube, the guide cavity and the first separation cavity are in communication with each other through the first inner tube; The second inner tube is connected with the second dividing chamber through the second inner tube. 8. The battery pack according to any one of claims 1 to 7, characterized in that the battery pack further comprises a limiting bracket, and the limiting bracket comprises: Substrate; a baffle, the baffle being disposed at an end of the substrate; There are multiple limit bars, and the multiple limit bars are arranged on the substrate at equal intervals along the length direction of the substrate. Limit slots are formed on both sides of each limit bar, and one battery cell is arranged in each limit slot. 9. The battery pack according to claim 8, characterized in that the battery cell has a rectangular parallelepiped structure, and the width of the limit slot is adapted to the thickness of the battery cell; The length of the battery cell extends along the width direction of the substrate, and the length of the battery cell is greater than the width of the substrate; The width direction of the battery core is in the same direction as the width direction of the baffle, and the width of the battery core is greater than the width of the baffle. 10. The battery pack according to any one of claims 1 to 7, wherein the housing comprises: Protective frame; A cover plate, the cover plate being arranged on the protection frame; a plurality of exhaust valves being arranged at intervals on the cover plate; The bottom plate is arranged on the protection frame, the cover plate and the bottom plate are arranged facing each other, and the cover plate, the bottom plate and the protection frame jointly define the cavity.