Battery and battery pack

Abstract

Disclosed in the present invention are a direct cooling plate for a battery pack, and the battery pack. The direct cooling plate (100) comprises: a direct cooling plate body, wherein the direct cooling plate body is provided with a first flow channel (12) and a second flow channel (13) which are both in communication with an inlet, the first flow channel (12) being adapted for heat exchange with batteries; and the direct cooling plate body is further provided with a third flow channel (14) in communication with an outlet, the third flow channel (14) being in communication with both the first flow channel (12) and the second flow channel (13) to enable mixing of heat exchange media flowing through the first flow channel (12) and the second flow channel (13).

Description

Batteries and battery packs

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202410216498.9, filed on February 27, 2024, entitled “Direct cooling plate for battery pack and battery pack”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to the field of batteries, and in particular to a direct cooling plate for a battery pack and a battery pack. Background Art

[0004] In the related art, direct cooling heat exchange or liquid cooling heat exchange is generally used for the thermal management of battery packs. Direct cooling heat exchange generally achieves the heat dissipation requirements of the battery pack by absorbing heat through the phase change (vaporization) of the heat exchange medium. The heat exchange medium near the outlet of the direct cooling plate is mostly in a vaporized state and the temperature is higher, which makes the temperature difference between the position near the outlet and the position near the inlet of the direct cooling plate too large, which can easily cause a single battery in the battery pack to be overcooled or overheated, and also easily lead to a large temperature difference between different batteries, which will greatly affect the performance and service life of the battery pack, and seriously affect the safety and reliability of the battery pack during operation. Therefore, how to effectively solve the excessive temperature difference near the inlet and outlet during the heat exchange process of the direct cooling plate has become a technical problem that needs to be solved in this field. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a direct cooling plate for a battery pack. When the direct cooling plate according to the present invention cools or heats the battery, after the first flow path exchanges heat with the battery, the temperature difference between the heat exchange medium in the first flow path and the heat exchange medium in the second flow path is large. Since the first flow path and the second flow path are respectively connected to the third flow path, the heat exchange media with a large temperature difference in the first flow path and the second flow path are mixed in the third flow path, so that the temperature of the heat exchange medium in the third flow path is relatively uniform, and the temperature at the inlet and outlet of the direct cooling plate is relatively uniform, thereby ensuring the consistency of the temperature of multiple batteries in the battery pack.

[0006] The present invention also provides a battery pack having the above-mentioned direct cooling plate.

[0007] According to the present invention, a direct cooling plate for a battery pack includes: a direct cooling plate body, on which a first flow path and a second flow path respectively connected to an inlet are formed, and the first flow path is suitable for exchanging heat with the battery; the direct cooling plate body is also formed with a third flow path connected to an outlet, and the third flow path is respectively connected to the first flow path and the second flow path to be suitable for mixing the heat exchange medium flowing through the first flow path and the second flow path.

[0008] According to the present invention, the direct cooling plate is connected to the third flow path through the first flow path and the second flow path respectively, and the outlet end of the third flow path is connected to the outlet. When the direct cooling plate cools or heats the battery, the first flow path exchanges heat with the battery, so that after heat exchange with the battery, the temperature of the heat exchange medium in the first flow path is larger than the temperature of the heat exchange medium in the second flow path. Because the first flow path and the second flow path are connected to the third flow path respectively, the heat exchange media with a large temperature difference in the first flow path and the second flow path are mixed in the third flow path, so that the temperature of the heat exchange medium flowing from the third flow path to the outlet of the direct cooling plate is relatively uniform, and the temperature at the inlet and outlet of the direct cooling plate is relatively uniform, thereby ensuring the consistency of the temperature of multiple batteries in the battery pack.

[0009] According to some embodiments of the present invention, the total flow rate of the first flow path is Q1, the total flow rate of the second flow path is Q2, and the following conditions are satisfied: Q1≤Q2.

[0010] According to some embodiments of the present invention, the first flow paths are configured as i1 lines connected in parallel, and / or the second flow paths are configured as i2 lines connected in parallel; wherein the flow rate of each first flow path and each second flow path is the same and satisfies: i1≤i2.

[0011] According to some embodiments of the present invention, the number of the third flow paths is i3, the number of the first flow paths is i1, the number of the second flow paths is i2, and the relationship: i3<(i1+i2) is satisfied.

[0012] According to some embodiments of the present invention, a plurality of diversion areas are formed on the direct cooling plate body, and each of the diversion areas is provided with a plurality of branch flow paths extending along the first direction and arranged at intervals in the second direction, and the plurality of branch flow paths are connected to each other to form the first flow path.

[0013] According to some embodiments of the present invention, the branch flow paths in two adjacent diversion areas are connected in series.

[0014] According to some embodiments of the present invention, a plurality of branch flow paths connected in parallel to each other are provided in each of the diversion areas; wherein the heat exchange medium in the branch flow paths in the same diversion area flows in the same direction and the heat exchange medium in the branch flow paths in two adjacent diversion areas flows in opposite directions.

[0015] According to some embodiments of the present invention, each of the second flow paths includes: a first flow path section, one end of the first flow path section is connected to the inlet, and the other end of the first flow path section extends along the first direction; a second flow path section, one end of the second flow path section is connected to the other end of the first flow path section, and the other end of the second flow path section extends along the second direction; and a third flow path section, both ends of the third flow path are respectively connected to the other end of the second flow path section and the third flow path.

[0016] According to some embodiments of the present invention, a plurality of heat exchange zones are formed on the direct cooling plate body, each of the heat exchange zones is provided with the first flow path, the second flow path and the third flow path, the connecting line between the inlet and the outlet is the symmetry center line, and the plurality of heat exchange zones are symmetrically arranged on both sides of the symmetry center line.

[0017] The battery pack according to the present invention is briefly described below.

[0018] The battery pack according to the present invention is provided with the direct cooling plate described in any one of the above embodiments. Since the battery pack according to the present invention is provided with the direct cooling plate described in any one of the above embodiments, a plurality of battery modules are further provided in the battery pack. The plurality of battery modules are arranged in sequence on the direct cooling plate and exchange heat with the first flow path. Therefore, when the direct cooling plate provided in the battery pack exchanges heat with the plurality of battery modules, the temperature of the heat exchange medium in the first flow path is larger than the temperature of the heat exchange medium in the second flow path. The heat exchange media in the first flow path and the second flow path are mixed in the third flow path, so that the temperature of the heat exchange medium flowing from the third flow path to the outlet of the direct cooling plate is relatively uniform, and the temperature at each position on the direct cooling plate is relatively balanced, so that the temperature of the battery modules arranged at the inlet and outlet of the direct cooling plate is in a balanced state and will not overheat or overcool. The temperature difference between the plurality of battery modules does not exceed a specific value, thereby improving the safety and stability of the battery pack during operation and improving the service life of the battery pack.

[0019] According to some embodiments of the present invention, a plurality of diversion areas are formed on the direct cooling plate body, and each of the diversion areas is provided with a plurality of branch flow paths extending along the first direction and arranged at intervals in the second direction, and the plurality of branch flow paths are connected to each other to form the first flow path; the battery module is provided with a plurality of first battery cells arranged at intervals in the first direction, each of the first battery cells extends in the second direction and is arranged corresponding to at least a portion of at least one diversion area, and the first battery cell exchanges heat with the branch flow paths in the diversion area.

[0020] According to some embodiments of the present invention, the width of each shunt region in the second direction is d, the length of each first battery cell in the second direction is l and is arranged opposite to n shunt regions, and satisfies: l=n*d.

[0021] According to some embodiments of the present invention, the second flow path is provided on one side of the diversion area in the first direction; the battery module is provided with a second battery cell, and the second battery cell exchanges heat with the second flow path.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of a first flow path, a second flow path, a third flow path, and a battery according to an embodiment of the present invention.

[0024] Figure numerals: 100, direct cooling plate; 101, inlet; 102, outlet; 12, first flow path; 121, diversion area; 122, branch flow path; 13, second flow path; 131, first flow channel section; 132, second flow channel section; 133, third flow channel section; 14, third flow path; 15, heat exchange area; 16, first battery cell. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the related art, direct cooling heat exchange or liquid cooling heat exchange is generally used for the thermal management of battery packs. Direct cooling heat exchange generally realizes the heat dissipation requirements of the battery pack by absorbing heat through the phase change (vaporization) of the heat exchange medium. The heat exchange medium is mostly in a vaporized state and has a higher temperature near the outlet of the direct cooling plate, which makes the temperature difference between the position near the outlet and the position near the inlet of the direct cooling plate too large, which can easily cause a single battery in the battery pack to be overcooled or overheated, and also easily lead to a large temperature difference between different batteries, which will greatly affect the performance and service life of the battery pack, and seriously affect the safety and reliability of the battery pack during operation. Therefore, how to effectively solve the excessive temperature difference during the heat exchange process of the direct cooling plate has become a technical problem that needs to be solved in this field.

[0027] A direct cooling plate for a battery pack according to an embodiment of the present invention will be described below with reference to FIG. 1 .

[0028] According to the present invention, the direct cooling plate 100 for the battery pack includes: a direct cooling plate 100 body, on which a first flow path 12 and a second flow path 13 respectively connected to an inlet 101 are formed, and the first flow path 12 is suitable for heat exchange with the battery; the direct cooling plate 100 body is also formed with a third flow path 14 connected to an outlet 102, and the third flow path 14 is respectively connected to the first flow path 12 and the second flow path 13 to be suitable for mixing the heat exchange medium flowing through the first flow path 12 and the second flow path 13.

[0029] In some specific implementations, an inlet 101, an outlet 102, a first flow path 12, a second flow path 13 and a third flow path 14 are provided on the direct cooling plate 100 body, and the inlet 101 is connected to the first flow path 12 and the second flow path 13 respectively. When the battery needs to be cooled during the operation of the battery pack, the low-temperature heat exchange medium can flow from the inlet 101 into the direct cooling plate 100 and flow along the first flow path 12 and the second flow path 13, wherein the first flow path 12 is provided at the bottom of the battery, and the first flow path 12 can be in contact with the battery, so that the heat exchange medium flowing in the first flow path 12 exchanges heat with the battery, realizing the heat dissipation function of the direct cooling plate 100 for the battery, a small part of the second flow path 13 passes through the bottom of the battery, and most of the second flow path 13 does not exchange heat with the battery, so the temperature of the heat exchange medium in the first flow path 12 after heat exchange with the battery is the same as that in the second flow path 13. Compared with the temperature of the heat exchange medium in the first flow path 12, the temperature of the heat exchange medium in the second flow path 13 is higher, and the temperature of the heat exchange medium in the second flow path 13 is lower. The first flow path 12 and the second flow path 13 are respectively connected to the third flow path 14, and the outlet 102 end of the third flow path 14 is connected to the outlet 102. After the first flow path 12 exchanges heat with the battery, the first flow path 12 can transport the heat exchange medium with a higher temperature to the third flow path 14, and the second flow path 13 can transport the heat exchange medium with a lower temperature to the third flow path 14. The heat exchange medium with a higher temperature and the heat exchange medium with a lower temperature are mixed in the third flow path 14 and then flow to the outlet 102. The temperature of the heat exchange medium flowing from the third flow path 14 to the direct cooling plate outlet 102 is relatively uniform, so that the temperature of the direct cooling plate 100 is relatively uniform, which ensures the consistency of the temperatures of multiple batteries in the battery pack and improves the battery performance and service life.

[0030] In other specific embodiments, the direct cooling plate 100 in the present application is not only suitable for cooling the battery but also for heating the battery. The high-temperature heat exchange medium can flow into the direct cooling plate 100 from the inlet 101 and flow along the first flow path 12 and the second flow path 13. The first flow path 12 can be in contact with the battery for heat exchange to achieve heating of the battery. A small part of the second flow path 13 passes through the bottom of the battery, and most of the second flow path 13 does not exchange heat with the battery. Therefore, the temperature of the heat exchange medium in the first flow path 12 after heat exchange with the battery is compared with the temperature of the heat exchange medium in the second flow path 13. The temperature of the heat exchange medium in the first flow path 12 is lower, and the temperature of the heat exchange medium in the second flow path 13 is higher. 12 and the second flow path 13 are respectively connected to the third flow path 14, and the outlet 102 end of the third flow path 14 is connected to the outlet 102. After the first flow path 12 exchanges heat with the battery, the first flow path 12 can transport the heat exchange medium with a lower temperature to the third flow path 14, and the second flow path 13 can transport the heat exchange medium with a higher temperature to the third flow path 14. The heat exchange medium with a higher temperature and the heat exchange medium with a lower temperature are mixed in the third flow path 14 and then flow to the outlet 102. Therefore, the temperature of the heat exchange medium flowing from the third flow path 14 to the direct cooling plate outlet 102 is relatively uniform, so that the temperature of the direct cooling plate 100 is relatively uniform, which ensures the consistency of the temperatures of multiple batteries in the battery pack and improves the battery performance and service life.

[0031] According to the present invention, the direct cooling plate 100 is connected to the third flow path 14 through the first flow path 12 and the second flow path 13 respectively, and the outlet end of the third flow path 14 is connected to the direct cooling plate outlet 102. When the direct cooling plate 100 cools or heats the battery, the first flow path 12 exchanges heat with the battery, so that after heat exchange with the battery, the temperature of the heat exchange medium in the first flow path 12 is larger than the temperature of the heat exchange medium in the second flow path 13. Because the first flow path 12 and the second flow path 13 are connected to the third flow path 14 respectively, the heat exchange media with a large temperature difference in the first flow path 12 and the second flow path 13 are mixed in the third flow path, so that the temperature of the heat exchange medium flowing from the third flow path 13 to the direct cooling plate outlet 102 is relatively uniform, and the temperature at the inlet and outlet of the direct cooling plate 100 is relatively uniform, thereby ensuring the consistency of the temperature of multiple batteries in the battery pack.

[0032] According to some embodiments of the present invention, the total flow rate of the first flow path 12 is Q1, the total flow rate of the second flow path 13 is Q2, and the following relationship is satisfied: Q1≤Q2.

[0033] In some specific embodiments, the total flow rate of the first flow path 12 is Q1, and the total flow rate of the second flow path 13 is Q2, wherein Q1 and Q2 satisfy the following relationship: Q1≤Q2.

[0034] When Q1≤Q2, that is, the flow rate of the heat exchange medium in the first flow path 12 is less than the flow rate of the heat exchange medium in the second flow path 13, the heat exchange requirements of the battery can be met while the temperature of the heat exchange medium in the second flow path 13 can be lower than the temperature of the heat exchange medium in the first flow path 12. This allows the heat exchange medium in the first flow path 12 to mix with the heat exchange medium in the second flow path 13 in the third flow path 14 before flowing to the outlet 102, thereby reducing the temperature of the heat exchange medium flowing from the third flow path 14 to the direct cooling plate outlet 102. This reduces the temperature at the direct cooling plate outlet 102, making the temperature of the direct cooling plate 100 more uniform, ensuring battery temperature consistency, and improving battery performance and service life. The setting scheme of Q1≤Q2 can ensure the temperature balance of each area of ​​the direct cooling plate 100, avoid the situation where the direct cooling plate 100 has excessive or insufficient local heat exchange capacity, and thus improve the overall heat exchange efficiency of the direct cooling plate 100 and the safety of the direct cooling plate 100 during heat exchange.

[0035] According to some embodiments of the present invention, the first flow paths 12 are configured as i1 lines connected in parallel, and / or the second flow paths 13 are configured as i2 lines connected in parallel; wherein the flow rate of each first flow path 12 and each second flow path 13 is the same and satisfies: i1≤i2.

[0036] In some specific embodiments, the first flow path 12 is constructed as a plurality of first flow paths 12 connected in parallel to each other, and the number of first flow paths 12 is i1; the second flow paths 13 are constructed as a plurality of second flow paths 13 connected in parallel to each other, and the number of second flow paths 13 is i2. When the cross-sectional area of ​​each first flow path 12 is the same as that of each second flow path 13, that is, the flow rate of each first flow path 12 is the same as that of each second flow path 13, i1 and i2 satisfy the following relationship: i1≤i2.

[0037] When i1≤i2, the number of the first flow channels is smaller than the number of the second flow channels, that is, the total flow rate of the heat exchange medium in the multiple first flow channels 12 is smaller than the total flow rate of the heat exchange medium in the multiple second flow channels 13, it can not only meet the heat exchange demand of the battery, but also make the temperature of the heat exchange medium flowing into the third flow channel 14 from the multiple second flow channels 13 lower than the temperature of the heat exchange medium flowing into the third flow channel 14 from the multiple first flow channels 12. The temperature of the heat exchange medium flowing to the outlet 102 of the direct cooling plate 100 after mixing in the third flow channel 14 is lower, which reduces the temperature at the outlet 102 of the direct cooling plate, makes the temperature of the direct cooling plate 100 more uniform, ensures the consistency of the battery temperature, and improves the battery performance and service life.

[0038] According to some embodiments of the present invention, the number of third flow paths 14 is i3, the number of first flow paths 12 is i1, the number of second flow paths 13 is i2, and the relationship: i3<(i1+i2) is satisfied.

[0039] In some specific embodiments, the number of first flow paths 12 is i1, and the number of second flow paths 13 is i2. The number of first flow paths 12 and second flow paths 13 can be adjusted according to the number of battery arrangements and the size of the batteries. The number of third flow paths 14 is i3, wherein i1, i2, and i3 satisfy the following relationship: i3 < (i1 + i2), that is, the number of flow paths for the heat exchange medium to enter the direct cooling plate 100 is greater than the number of flow paths for the heat exchange medium to flow out of the direct cooling plate 100, so that the flow distance of the heat exchange medium in the direct cooling plate 100 is longer, and the heat exchange medium stays in the direct cooling plate 100 for a longer time, thereby improving the heat exchange effect on the battery.

[0040] According to some embodiments of the present invention, a plurality of diversion areas 121 are formed on the main body of the direct cooling plate 100, and each diversion area 121 is provided with a plurality of branch flow paths 122 extending along the first direction and arranged at intervals in the second direction. The plurality of branch flow paths 122 are connected to each other to form a first flow path 12.

[0041] In some specific implementations, a plurality of diversion areas 121 are formed on the main body of the direct cooling plate 100. The plurality of diversion areas 121 are connected to each other and to the first flow path 12. A plurality of branch flow paths 122 are provided in each diversion area 121. It can be understood that the heat exchange medium in the first flow path 12 can first flow into a diversion area 121, and the heat exchange medium flows along the plurality of branch flow paths 122 provided in the diversion area 121 in this diversion area 121, and flows to the next diversion area 121. Since the plurality of branch flow paths 122 extend respectively in the first direction and are arranged at intervals in the second direction, the first direction is the battery arrangement direction, and the second direction is the battery length direction, the flow path of the heat exchange medium is extended, the residence time of the heat exchange medium in the plurality of diversion areas 121 is increased, the utilization rate of the heat exchange medium is improved, and the vaporization time of the heat exchange medium is delayed.

[0042] According to some embodiments of the present invention, the branch flow paths 122 within two adjacent diversion areas 121 are arranged in series with each other, so that the heat exchange medium flowing from the first flow path 12 into the diversion area 121 can continue to flow between multiple diversion areas 121, avoiding the heat exchange medium from directly flowing into the third flow path 14 after passing through a diversion area 121, thereby ensuring the fluidity of the heat exchange medium in each diversion area 121 and improving the utilization rate of the heat exchange medium.

[0043] According to some embodiments of the present invention, a plurality of branch flow paths 122 connected in parallel to each other are provided in each diversion area 121; wherein the heat exchange medium in the branch flow paths 122 in the same diversion area 121 flows in the same direction, and the heat exchange medium in the branch flow paths 122 in two adjacent diversion areas 121 flows in opposite directions.

[0044] In some specific embodiments, each diversion area 121 includes multiple branch flow paths 122 connected in parallel with each other, and the heat exchange medium flowing in the multiple branch flow paths 122 in the same diversion area 121 has the same flow direction. When the heat exchange medium flows into one of the diversion areas 121, the heat exchange medium can flow in the same direction through multiple branch flow paths 122 at the same time, so that the heat exchange medium flowing in the multiple branch flow paths 122 can simultaneously exchange heat for the battery, while also increasing the contact area between the heat exchange medium and the battery, thereby improving the heat exchange efficiency and heat exchange effect of the battery.

[0045] In addition, since the arrangement direction of the multiple batteries is the extension direction of the branch flow path 122, as the heat exchange medium flows in the multiple branch flow paths 122, the heat loss of the heat exchange medium gradually increases. The increase in heat loss of the heat exchange medium will reduce the heat exchange effect on the battery. By making one of the heat exchange media in the branch flow paths 122 in two adjacent diversion areas 121 flow in the first direction and the other flow in the second direction, and the first flow direction is opposite to the second flow direction, the phenomenon that some batteries in the diversion area 121 have good heat exchange effects and some batteries have poor heat exchange effects can be avoided, so that the direct cooling plate 100 can have a more balanced heat exchange for multiple batteries in the diversion area 121.

[0046] According to some embodiments of the present invention, each second flow path 13 includes: a first flow channel section 131, one end of the first flow channel section 131 is connected to the inlet 101, and the other end of the first flow channel section 131 extends along the first direction; a second flow channel section 132, one end of the second flow channel section 132 is connected to the other end of the first flow channel section 131, and the other end of the second flow channel section 132 extends along the second direction; a third flow channel section 133, both ends of the third flow channel are respectively connected to the other end of the second flow channel section 132 and the third flow path 14.

[0047] In some specific implementations, each second flow path 13 is composed of a first flow path section 131, a second flow path section 132 and a third flow path section 133. One end of the first flow path section 131 is connected to the inlet 101, and the other end of the first flow path section 131 extends in the first direction and a portion of the first flow path section 131 flows through the bottom of the battery and can exchange heat with the battery. One end of the second flow path section 132 is connected to the first flow path section 131, and the other end of the second flow path section extends in the second direction and the second flow path section 132 does not pass through the bottom of the battery and does not exchange heat with the battery. The other ends of the second flow paths 132 on the same side are connected to each other. In the present application, The first flow channel section 131 and the second flow channel section 132 on the direct cooling plate 100 can be constructed as multiple sections, and the third flow channel section 133 is constructed as one section. One end of the third flow channel section 133 is connected to the other end of the second flow channel section 132, and the other end of the third flow channel section 133 is connected to the third flow path 14, wherein part of the third flow channel section 133 extends along the first direction, and at least another part of the third flow channel section 133 extends along the second direction, thereby increasing the flow distance of the heat exchange medium in the second flow path 13, increasing the flow area of ​​the heat exchange medium on the direct cooling plate 100, increasing the residence time of the heat exchange medium in the direct cooling plate 100, and improving the heat exchange effect of the direct cooling plate 100.

[0048] According to some embodiments of the present invention, a plurality of heat exchange zones 15 are formed on the body of the direct cooling plate 100, each heat exchange zone 15 is provided with a first flow path 12, a second flow path 13 and a third flow path 14, the connecting line between the inlet 101 and the outlet 102 is the symmetry center line, and the plurality of heat exchange zones 15 are symmetrically arranged on both sides of the symmetry center line.

[0049] In some specific embodiments, a plurality of heat exchange zones 15 are provided on the direct cooling plate 100 body, and a first flow path 12, a plurality of diversion zones 121, a second flow path 13 and a third flow path 14 are provided in each heat exchange zone 15. The range of the heat exchange zone 15 is planned according to the number and arrangement method of the batteries. With the line between the inlet 101 and the outlet 102 as the center of symmetry, the plurality of heat exchange zones 15 are symmetrically arranged on both sides of the center of symmetry. On the one hand, the design difficulty of the direct cooling plate 100 is simplified and the manufacturing efficiency of the direct cooling plate 100 is improved. On the other hand, the first flow path 12, the second flow path 13 and the third flow path 14 in the plurality of heat exchange zones 15 are arranged more evenly on the direct cooling plate 100, thereby ensuring the consistency of the temperature of multiple batteries in the battery pack.

[0050] The battery pack according to the present invention is briefly described below.

[0051] The battery pack according to the present invention is provided with the direct cooling plate 100 described in any one of the above embodiments. Since the battery pack according to the present invention is provided with the direct cooling plate 100 described in any one of the above embodiments, a plurality of battery modules are further provided in the battery pack. The plurality of battery modules are arranged in sequence on the direct cooling plate 100 and exchange heat with the first flow path. Therefore, when the direct cooling plate 100 provided in the battery pack exchanges heat with the plurality of battery modules, the temperature of the heat exchange medium in the first flow path 12 is larger than the temperature of the heat exchange medium in the second flow path 13. The heat exchange media in the first flow path 12 and the second flow path 13 are mixed in the third flow path 14, so that the temperature of the heat exchange medium flowing from the third flow path 14 to the direct cooling plate outlet 102 is relatively uniform, and the temperature at each position on the direct cooling plate 100 is relatively balanced, so that the temperature of the battery modules arranged at the inlet and outlet of the direct cooling plate is in a balanced state and will not overheat or overcool. The temperature difference between the plurality of battery modules does not exceed a specific value, thereby improving the safety and stability of the battery pack during operation and extending the service life of the battery pack.

[0052] According to some embodiments of the present invention, a plurality of diversion areas 121 are formed on the direct cooling plate body, and each diversion area 121 is provided with a plurality of branch flow paths 122 extending along the first direction and arranged at intervals in the second direction, and the plurality of branch flow paths 122 are connected to each other to form a first flow path 12; the battery module is provided with a plurality of first battery cells 16 arranged at intervals in the first direction, each first battery cell 16 extends in the second direction and is arranged corresponding to at least a portion of at least one diversion area 121, and the first battery cell 16 exchanges heat with the branch flow paths 122 in the diversion area 121.

[0053] In some specific embodiments, a plurality of branch flow areas 121 are formed on the direct cooling plate body, and the plurality of branch flow areas 121 are connected to each other to form a first flow path 12, and a plurality of branch flow paths 122 are provided in each branch flow area 121. It is understandable that the heat exchange medium in the first flow path 12 can first flow into a branch flow area 121, and the heat exchange medium flows along the plurality of branch flow paths 122 provided in the branch flow area 121 in this branch flow area 121, and flows to the next branch flow area 121. The plurality of branch flow paths 122 extend respectively in the first direction and are spaced apart in the second direction to extend the heat exchange medium in the first flow path 12. The flow path in the diversion area 121 increases the residence time of the heat exchange medium in the multiple diversion areas 121121, improves the utilization rate of the heat exchange medium, and delays the vaporization time of the heat exchange medium; and a plurality of first battery cells 16 are provided in the battery module, each first battery cell 16 extends in the second direction, and the plurality of first battery cells 16 are arranged at intervals in the first direction and are arranged corresponding to at least a portion of at least one diversion area 121. The first battery cells 16 exchange heat with the multiple diversion branches in the diversion area 121, thereby increasing the heat exchange area between the first battery cells 16 and the first flow path 12, and improving the heat exchange effect of the direct cooling plate on the battery module.

[0054] According to some embodiments of the present invention, the width of each shunt region 121 in the second direction is d, the length of each first battery cell 16 in the second direction is l and is arranged opposite to n shunt regions 121, and satisfies: l=n*d.

[0055] In some specific embodiments, the width of each diversion area 121 in the second direction is d, the number of diversion areas 121 arranged on the direct cooling plate body is n, the length of each first battery cell 16 in the second direction is l and is arranged opposite to the number n of diversion areas 121, wherein l, n, and d satisfy the following relationship: l = n*d.

[0056] When l, n, and d satisfy the above relationship, on the one hand, since l, n, and d satisfy the relationship of integer multiples, the structure of the multiple diversion areas 121 arranged on the direct cooling plate is more compact, thereby improving the space utilization of the direct cooling plate. On the other hand, the first battery cell 16 can be arranged across multiple diversion areas 121, and heat exchange can be performed simultaneously in multiple diversion areas 121, thereby improving the heat exchange efficiency of the direct cooling plate for the first battery cell 16, and at the same time improving the heat exchange effect of the direct cooling plate for the battery module.

[0057] According to some embodiments of the present invention, the second flow path 13 is provided on one side of the diversion area 121 in the first direction; the battery module is provided with a second battery cell, and the second battery cell exchanges heat with the second flow path 13 .

[0058] In some specific embodiments, a second flow path 13 is provided on one side of the diversion area 121 in the first direction, at least a portion of the second flow path 13 extends along the second direction, a second battery cell is provided in the battery module, and the second battery cell is arranged opposite to the second flow path 13. The second battery cell exchanges heat with the second flow path 13 to achieve heating or cooling of the second battery cell.

[0059] It should be noted that, compared with the temperature of the heat exchange medium in the second flow path 13 after heat exchange with the second battery cell and the temperature of the heat exchange medium in the first flow path 12 after heat exchange with the first battery cell 16, the temperature of the heat exchange medium in the first flow path 12 is higher, and the temperature of the heat exchange medium in the second flow path 13 is lower. The first flow path 12 and the second flow path 13 are respectively connected to the third flow path 14 and mixed in the third flow path 14, so that the temperature of the heat exchange medium flowing from the third flow path 14 to the outlet of the direct cooling plate is relatively uniform, and the temperature of the direct cooling plate is relatively uniform, thereby ensuring the consistency of the temperatures of multiple battery modules in the battery pack and improving the performance and service life of the battery modules.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 should not be understood as limiting the present invention.

[0061] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0062] In the description of the present invention, "plurality" means two or more.

[0063] In the description of the present invention, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features not being in direct contact with each other but being in contact with each other via another feature therebetween.

[0064] In the description of the present invention, “on”, “above” and “above” a first feature of a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0065] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A direct cooling plate (100) for a battery pack, characterized in that: include: A direct cooling plate (100) body is formed on the direct cooling plate (100) body, wherein a first flow path (12) and a second flow path (13) are respectively connected to the inlet (101), and the first flow path (12) is suitable for heat exchange with the battery (16); A third flow path (14) connected to the outlet (102) is also formed on the main body of the direct cooling plate (100), and the third flow path (14) is respectively connected to the first flow path (12) and the second flow path (13) to be suitable for mixing the heat exchange medium flowing through the first flow path (12) and the second flow path (13).

2. The direct cooling plate (100) for a battery pack according to claim 1, characterized in that: The total flow rate of the first flow path (12) is Q1, the total flow rate of the second flow path (13) is Q2, and the relationship Q1≤Q2 is satisfied.

3. The direct cooling plate (100) for a battery pack according to claim 2, characterized in that: The first flow paths (12) are configured as i1 lines connected in parallel to each other, and / or the second flow paths (13) are configured as i2 lines connected in parallel to each other; wherein the flow rate of each first flow path (12) and each second flow path (13) is the same and satisfies: i1≤i2.

4. The direct cooling plate (100) for a battery pack according to claim 2 or 3, characterized in that: The number of the third flow paths (14) is i3, the number of the first flow paths (12) is i1, the number of the second flow paths (13) is i2, and the relationship: i3<(i1+i2) is satisfied.

5. The direct cooling plate (100) for a battery pack according to any one of claims 1 to 4, characterized in that: A plurality of diversion areas (121) are formed on the main body of the direct cooling plate (100), and a plurality of branch flow paths (122) are provided in each of the diversion areas (121), respectively extending along a first direction and arranged at intervals in a second direction. The plurality of branch flow paths (122) are connected to each other to form the first flow path (12).

6. The direct cooling plate (100) for a battery pack according to claim 5, characterized in that: The branch flow paths (122) in two adjacent diversion areas (121) are connected in series.

7. The direct cooling plate (100) for a battery pack according to claim 6, characterized in that: A plurality of branch flow paths (122) connected in parallel to each other are provided in each of the branch flow areas (121); in The heat exchange medium in the branch flow paths (122) in the same branch flow area (121) flows in the same direction, and the heat exchange medium in the branch flow paths (122) in two adjacent branch flow areas (121) flows in opposite directions.

8. The direct cooling plate (100) for a battery pack according to any one of claims 1 to 7, characterized in that: Each of the second flow paths (13) comprises: a first flow channel section (131), one end of the first flow channel section (131) being in communication with the inlet (101), and the other end of the first flow channel section (131) extending along a first direction; a second flow channel section (132), one end of the second flow channel section (132) being connected to the other end of the first flow channel section (131), and the other end of the second flow channel section (132) extending along a second direction; A third flow channel section (133), both ends of the third flow channel are respectively connected to the other end of the second flow channel section (132) and the third flow path (14).

9. The direct cooling plate (100) for a battery pack according to any one of claims 1 to 8, characterized in that: A plurality of heat exchange zones (15) are formed on the main body of the direct cooling plate (100), and each of the heat exchange zones (15) is provided with the first flow path (12), the second flow path (13) and the third flow path (14). The line connecting the inlet (101) and the outlet (102) is a symmetrical center line, and the plurality of heat exchange zones (15) are symmetrically arranged on both sides of the symmetrical center line.

10. A battery pack, characterized in that: include Battery modules; A direct cooling plate (100), wherein the direct cooling plate (100) is constructed as the direct cooling plate (100) according to any one of claims 1 to 9; The battery modules are constructed in plural and are sequentially arranged on the direct cooling plate (100) and perform heat exchange with the first flow path.

11. The battery pack according to claim 10, characterized in that: A plurality of diversion areas (121) are formed on the main body of the direct cooling plate (100), and a plurality of branch flow paths (122) are provided in each of the diversion areas (121), respectively extending along a first direction and spaced apart in a second direction, and the plurality of branch flow paths (122) are connected to each other to form the first flow path (12); The battery module is provided with a plurality of first battery cells (16) spaced apart in a first direction, each of the first battery cells (16) extending in a second direction and corresponding to at least a portion of at least one shunt region, and the first battery cells (16) exchange heat with the branch flow path (122) in the shunt region.

12. The battery pack according to claim 10 or 11, characterized in that: The width of each shunt area in the second direction is d, the length of each first battery cell (16) in the second direction is l and is arranged opposite to n shunt areas, and satisfies the following: l=n*d.

13. The battery pack according to claim 11 or 12, characterized in that: The second flow path (13) is provided on one side of the diversion area in the first direction; the battery module is provided with a second battery core, and the second battery core exchanges heat with the second flow path (13).

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