CN117878488A - Direct cooling plate for battery pack and battery pack - Google Patents

Abstract

The invention discloses a direct cooling plate for a battery pack and the battery pack, wherein the direct cooling plate comprises: the direct cooling plate body is provided with a first flow path and a second flow path which are respectively communicated with the inlet, and the first flow path is suitable for exchanging heat with the battery; the direct cooling plate body is also provided with a third flow path communicated with the outlet, and the third flow path is respectively communicated with the first flow path and the second flow path so as to be suitable for mixing heat exchange media flowing through the first flow path and the second flow path. When the direct cooling plate is used for cooling or heating the battery, after the heat exchange between the first flow path and the battery is carried out, the temperature difference between the heat exchange medium in the first flow path and the heat exchange medium in the second flow path is larger, and the heat exchange medium with larger temperature difference between the first flow path and the second flow path is mixed in the third flow path because the first flow path and the second flow path are respectively communicated with the third flow path, so that the temperature of the heat exchange medium in the third flow path is more uniform, the temperature at the inlet and the outlet of the direct cooling plate is more uniform, and the consistency of the temperatures of a plurality of batteries in the battery pack is ensured.

Description

Direct cooling plate for battery pack and battery pack

Technical Field

The invention relates to the field of batteries, in particular to a direct cooling plate for a battery pack and the battery pack.

Background

In the related art, direct cooling heat exchange or liquid cooling heat exchange is generally adopted for heat management of a battery pack, and the heat dissipation requirement of the battery pack is generally realized through phase change (vaporization) heat absorption of a heat exchange medium, so that the temperature difference between the position of the direct cooling plate close to an outlet and the position of the direct cooling plate close to an inlet is higher, the supercooling or overheating of a single battery in the battery pack is easy to cause, the temperature difference between different batteries is also easy to cause, the performance and the service life of the battery pack are greatly influenced, and the safety and the reliability of the battery pack are seriously influenced, so that the technical problem to be solved in the field is how to effectively solve the too large temperature difference between the position of the direct cooling plate close to the inlet and the outlet in the heat exchange process.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to propose a direct cooling plate for a battery pack. When the direct cooling plate is used for cooling or heating the battery, after the heat exchange between the first flow path and the battery is carried out, the temperature difference between the heat exchange medium in the first flow path and the heat exchange medium in the second flow path is larger, and the heat exchange medium with larger temperature difference between the first flow path and the second flow path is mixed in the third flow path because the first flow path and the second flow path are respectively communicated with the third flow path, so that the temperature of the heat exchange medium in the third flow path is more uniform, the temperature at the inlet and the outlet of the direct cooling plate is more uniform, and the consistency of the temperatures of a plurality of batteries in the battery pack is ensured.

The invention also provides a battery pack with the direct cooling plate.

The direct cooling plate for a battery pack according to the present invention includes: the direct cooling plate comprises a direct cooling plate body, wherein a first flow path and a second flow path which are respectively communicated with an inlet are formed on the direct cooling plate body, and the first flow path is suitable for exchanging heat with a battery; and a third flow path communicated with the outlet is formed on the direct cooling plate body, and the third flow path is respectively communicated with the first flow path and the second flow path so as to be suitable for mixing heat exchange media flowing through the first flow path and the second flow path.

According to the invention, the direct cooling plate is respectively communicated with the third flow path through the first flow path and the second flow path, the outlet end of the third flow path is communicated with the outlet, when the direct cooling plate cools or heats the battery, the first flow path exchanges heat with the battery, so that after the direct cooling plate exchanges heat with the battery, the temperature difference between the temperature of the heat exchange medium in the first flow path and the temperature of the heat exchange medium in the second flow path is larger, and the heat exchange medium with larger temperature difference between the first flow path and the second flow path is respectively communicated with the third flow path.

According to some embodiments of the invention, the total flow of the first flow path is Q1, the total flow of the second flow path is Q2, and: q1 is less than or equal to Q2.

According to some embodiments of the invention, the first flow path is configured as i1 strips in parallel with each other and/or the second flow path is configured as i2 strips in parallel with each other; wherein each of the first flow paths and each of the second flow paths have the same flow rate and satisfy: i1 is less than or equal to i2.

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

According to some embodiments of the invention, the direct cooling plate body is formed with a plurality of split areas, each of which is provided therein with a plurality of branch flow paths extending in the first direction and arranged at intervals in the second direction, respectively, and the plurality of branch flow paths communicate with each other to constitute the first flow path.

According to some embodiments of the invention, the branching flow paths in adjacent two of the branching regions are arranged in series with each other.

According to some embodiments of the invention, a plurality of branch flow paths connected in parallel with each other are arranged in each of the split areas; wherein the flow direction of the heat exchange medium in the branch flow paths in the same flow dividing region is the same and the flow directions of the heat exchange medium in the branch flow paths in two adjacent flow dividing regions are opposite.

According to some embodiments of the invention, each of the second flow paths comprises: a first flow path section having one end in communication with the inlet and the other end extending in a first direction; a second flow path section, one end of which is connected to the other end of the first flow path section, the other end of which extends in a second direction; and two ends of the third flow channel are respectively communicated with the other end of the second flow channel section and the third flow channel.

According to some embodiments of the invention, the direct cooling plate body is formed with a plurality of heat exchange areas, each heat exchange area is internally provided with the first flow path, the second flow path and the third flow path, a connecting line between the inlet and the outlet is a symmetrical center line, and the plurality of heat exchange areas are symmetrically arranged at two sides of the symmetrical center line.

The battery pack according to the present invention is briefly described as follows.

According to the battery pack provided with the direct cooling plate according to any one of the embodiments, the battery pack is provided with the direct cooling plate according to any one of the embodiments, and the battery pack is internally provided with the plurality of battery modules which are sequentially arranged on the direct cooling plate and exchange heat with the first flow path, so that when the direct cooling plate in the battery pack exchanges heat with the plurality of battery modules, the temperature difference between the heat exchange medium temperature in the first flow path and the heat exchange medium temperature in the second flow path is larger, the heat exchange medium temperature in the first flow path and the heat exchange medium temperature in 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 more uniform, the temperature of each position on the direct cooling plate is more uniform, the temperature of the battery modules arranged at the inlet and the outlet of the direct cooling plate is in an equilibrium state, the temperature difference between the plurality of battery modules does not exceed a specific value, the safety and the stability of the battery pack are improved, and the service life of the battery pack is prolonged.

According to some embodiments of the present invention, the direct cooling plate body is formed with a plurality of split areas, each of which is provided with a plurality of branch flow paths extending along a first direction and arranged at intervals in a second direction, and the plurality of branch flow paths are communicated with each other to form the first flow path; the battery module is provided with a plurality of first electric cores which are arranged at intervals in a first direction, each first electric core extends in a second direction and is arranged corresponding to at least part of at least one shunting area, and the first electric cores exchange heat with the branch flow paths in the shunting areas.

According to some embodiments of the invention, each of the shunt regions has a width d in the second direction, and each of the first cells has a length l in the second direction and is disposed opposite to the number n of shunt regions, and satisfies: l=n×d.

According to some embodiments of the invention, the second flow path is disposed on one side of the split area in the first direction; the battery module is provided with a second electric core, and the second electric core exchanges heat with the second flow path.

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

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram illustrating heat exchange between a first flow path, a second flow path, and a third flow path and a battery module according to an embodiment of the present invention.

Reference numerals:

100. a direct cooling plate; 101. An inlet; 102. An outlet;

12. a first flow path; 121. A split area; 122. A branch flow path;

13. a second flow path; 131. a first flow path section; 132. a second flow path section; 133. a third flow path segment;

14. a third flow path; 15. a heat exchange area; 16. and the first battery cell.

Detailed Description

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

In the related art, direct cooling heat exchange or liquid cooling heat exchange is generally adopted for heat management of the battery pack, and the heat dissipation requirement of the battery pack is generally realized through phase change (vaporization) heat absorption of a heat exchange medium, so that the temperature difference between the position of the direct cooling plate close to the outlet and the position of the direct cooling plate close to the inlet is too high, the supercooling or overheating of a single battery in the battery pack is easy to cause, the temperature difference between different batteries is also easy to be larger, the performance and the service life of the battery pack can be greatly influenced, and the safety and the reliability of the battery pack are seriously influenced, so that the technical problem to be solved in the field is how to effectively solve the too large temperature difference in the heat exchange process of the direct cooling plate.

A direct cooling plate for a battery pack according to an embodiment of the present invention is described below with reference to fig. 1.

The direct cooling plate 100 for a battery pack according to the present invention includes: a direct cooling plate 100 body, wherein a first flow path 12 and a second flow path 13 which are respectively communicated with the inlet 101 are formed on the direct cooling plate 100 body, and the first flow path 12 is suitable for exchanging heat with a battery; the direct cooling plate 100 further has a third flow path 14 formed thereon in communication with the outlet 102, the third flow path 14 being in communication with the first and second flow paths 12 and 13, respectively, for mixing the heat exchange medium flowing through the first and second flow paths 12 and 13.

In some embodiments, an inlet 101, an outlet 102, a first flow path 12, a second flow path 13 and a third flow path 14 are arranged on the body of the direct cooling plate 100, the inlet 101 is respectively communicated with the first flow path 12 and the second flow path 13, when the battery needs to be cooled in the running process of the battery pack, a low-temperature heat exchange medium can flow into the direct cooling plate 100 from the inlet 101 and along the first flow path 12 and the second flow path 13, wherein the first flow path 12 is arranged at the bottom of the battery, 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, the heat dissipation function of the direct cooling plate 100 on the battery is realized, a small part of the second flow path 13 passes through the bottom of the battery, a large part of the second flow path 13 does not exchange heat with the battery, and 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 higher, 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 communicated with the third flow path 14, the outlet 102 end of the third flow path 14 is communicated with the outlet 102, after the first flow path 12 exchanges heat with a battery, the first flow path 12 can convey the heat exchange medium with higher temperature to the third flow path 14, the second flow path 13 can convey the heat exchange medium with lower temperature to the third flow path 14, the heat exchange medium with higher temperature and the heat exchange medium with 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 to the outlet 102 of the direct cooling plate from the third flow path 14 is more uniform, the temperature of the direct cooling plate 100 is more uniform, the consistency of the temperatures of a plurality of batteries in the battery pack is ensured, and the performance and the service life of the battery are improved.

In other embodiments, the direct cooling plate 100 in the present application is not only suitable for cooling a battery, but also suitable for heating a 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 exchange heat with the battery, so as to heat the battery, a small part of the second flow path 13 passes through the bottom of the battery, most of the second flow path 13 does not exchange heat with the battery, therefore, compared with the temperature of the heat exchange medium in the first flow path 12 after heat exchange with the battery, the temperature of the heat exchange medium in the first flow path 12 is lower than the temperature of the heat exchange medium in the second flow path 13, the temperature of the heat exchange medium in the second flow path 13 is higher, the first flow path 12 and the second flow path 13 are respectively communicated with the third flow path 14, and the outlet 102 end of the third flow path 14 is communicated with the outlet 102, after the first flow path 12 exchanges heat with the battery, the first flow path 12 can convey the heat exchange medium with the lower temperature to the third flow path 14, the second flow path 13 can convey the heat exchange medium with the higher temperature to the third flow path 14, so that the temperature of the heat exchange medium is uniform in the third flow path 14 after heat exchange medium is mixed with the third flow path 14, and the temperature of the medium in the second flow path 14 is more uniform than the temperature of the second flow path 102 is more than the temperature medium in the second flow path 100, which has a uniform temperature, and the temperature can flow uniformly and the medium flows towards the outlet medium at the outlet 100.

According to the direct cooling plate 100, the first flow path 12 and the second flow path 13 are respectively communicated with the third flow path 14, the outlet end of the third flow path 14 is communicated with the direct cooling plate outlet 102, when the direct cooling plate 100 cools or heats a battery, the first flow path 12 exchanges heat with the battery, so that after the heat exchange is carried out on the battery, the temperature difference between the temperature of a heat exchange medium in the first flow path 12 and the temperature of the heat exchange medium in the second flow path 13 is larger than the temperature difference between the temperature of the heat exchange medium in the first flow path 12 and the temperature of the heat exchange medium in the second flow path 13, and the heat exchange medium with larger temperature difference between the first flow path 12 and the second flow path 13 is mixed in the third flow path, so that the temperature of the heat exchange medium flowing into the direct cooling plate outlet 102 is more uniform, and the temperature at the inlet and outlet of the direct cooling plate 100 is more uniform, thereby ensuring the consistency of the temperatures of a plurality of batteries in a battery pack.

According to some embodiments of the 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 is satisfied: q1 is less than or equal to Q2.

In some embodiments, the total flow of the first flow path 12 is Q1 and the total flow of the second flow path 13 is Q2, wherein Q1 and Q2 satisfy the following relationship: q1 is less than or equal to Q2.

When Q1 is less than or equal to Q2, that is, the flow of the heat exchange medium in the first flow path 12 is smaller than the flow of the heat exchange medium in the second flow path 13, the heat exchange requirement on the battery can be met, the temperature of the heat exchange medium in the second flow path 13 is smaller than the temperature of the heat exchange medium in the first flow path 12, the heat exchange medium in the first flow path 12 and the heat exchange medium in the second flow path 13 can be 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 reduced, the temperature of the direct cooling plate 100 is uniform, the consistency of the battery temperature is ensured, and the battery performance and the service life are improved. The arrangement scheme of Q1 is less than or equal to Q2 can ensure the temperature balance of each area of the direct cooling plate 100, avoid the situation that the local heat exchange capacity of the direct cooling plate 100 is too strong or too weak, and further improve the overall heat exchange efficiency of the direct cooling plate 100 and the safety of the direct cooling plate 100 in heat exchange.

According to some embodiments of the invention, the first flow path 12 is configured as i1 strips in parallel with each other and/or the second flow path 13 is configured as i2 strips in parallel with each other; wherein the flow rate of each first flow path 12 is the same as that of each second flow path 13 and satisfies: i1 is less than or equal to i2.

In some specific embodiments, the first flow paths 12 are configured as a plurality connected in parallel to each other, the number of first flow paths 12 is i1, the number of second flow paths 13 is configured as a plurality connected in parallel to each other, the number of second flow paths 13 is i2, in the case where 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, wherein i1 and i2 satisfy the following relationship: i1 is less than or equal to i2.

When the number of the first channels i1 is less than or equal to i2 and is smaller than the number of the second channels, namely, the total flow of the heat exchange medium in the plurality of first channels 12 is smaller than the total flow of the heat exchange medium in the plurality of second channels 13, the heat exchange requirement on the battery can be met, the temperature of the heat exchange medium flowing into the third channel 14 from the plurality of second channels 13 is smaller than the temperature of the heat exchange medium flowing into the third channel 14 from the plurality of first channels 12, the temperature of the heat exchange medium flowing into the outlet 102 of the direct cooling plate 100 after being mixed in the third channel 14 is lower, the temperature of the outlet 102 of the direct cooling plate is reduced, the temperature of the direct cooling plate 100 is uniform, the consistency of the battery temperature is ensured, and the performance and the service life of the battery are improved.

According to some embodiments of the 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 following is satisfied: i3 < (i1+i2).

In some embodiments, the number of the first flow paths 12 is i1, the number of the second flow paths 13 is i2, the number of the first flow paths 12 and the second flow paths 13 can be adjusted according to the number of the arranged batteries and the size of the batteries, and the number of the third flow paths 14 is i3, wherein i1, i2 and i3 satisfy the following relationship: i3 < (i1+i2), namely, the number of flow paths of the heat exchange medium entering the direct cooling plate 100 is larger than the number of flow paths of the heat exchange medium exiting the direct cooling plate 100, so that the flow path of the heat exchange medium in the direct cooling plate 100 is longer, the residence time of the heat exchange medium in the direct cooling plate 100 is longer, and the heat exchange effect on the battery is improved.

According to some embodiments of the present invention, a plurality of branch flow paths 122 extending in the first direction and arranged at intervals in the second direction are formed in the body of the direct cooling plate 100, and a plurality of branch flow paths 122 are provided in each of the branch flow paths 121, the plurality of branch flow paths 122 being communicated with each other to constitute the first flow path 12.

In some embodiments, the body of the direct cooling plate 100 is formed with a plurality of split areas 121, the split areas 121 are mutually communicated and are communicated with the first flow path 12, a plurality of branch flow paths 122 are arranged in each split area 121, it is understood that the heat exchange medium in the first flow path 12 can flow into one split area 121 first, the heat exchange medium flows in the split area 121 along the plurality of branch flow paths 122 arranged in the split area 121 and flows towards the next split area 121, and the plurality of branch flow paths 122 extend along a first direction and are arranged at intervals in a second direction, wherein the first direction is the arrangement direction of the batteries, and the second direction is the length direction of the batteries, so that the flow path of the heat exchange medium is prolonged, the residence time of the heat exchange medium in the plurality of split areas 121 is prolonged, the utilization rate of the heat exchange medium is improved, and the vaporization time of the heat exchange medium is delayed.

According to some embodiments of the present invention, the branch flow paths 122 in two adjacent flow dividing regions 121 are arranged in series, so that the heat exchange medium flowing into the flow dividing regions 121 from the first flow path 12 can continuously flow between the flow dividing regions 121, the heat exchange medium is prevented from directly flowing into the third flow path 14 after passing through one flow dividing region 121, the flow connectivity of the heat exchange medium in each flow dividing region 121 is ensured, and the utilization rate of the heat exchange medium is improved.

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

In some embodiments, each of the split areas 121 includes a plurality of branch flow paths 122 connected in parallel, and the heat exchange mediums flowing in the plurality of branch flow paths 122 in the same split area 121 flow in the same direction, when the heat exchange mediums flow into one of the split areas 121, the heat exchange mediums can flow in the same direction through the plurality of branch flow paths 122 at the same time, so that the heat exchange mediums flowing in the plurality of branch flow paths 122 can exchange heat with the battery at the same time, and meanwhile, the contact area between the heat exchange mediums and the battery is increased, and the heat exchange efficiency and the heat exchange effect of the battery are improved.

In addition, since the arrangement direction of the plurality of batteries is the extending direction of the branch flow paths 122, along with the flow of the heat exchange medium in the plurality of branch flow paths 122, the heat loss of the heat exchange medium is gradually increased, the heat exchange effect on the batteries is reduced, one of the heat exchange mediums in the branch flow paths 122 in the two adjacent split areas 121 flows towards the first flow direction, the other one flows towards the second direction, and meanwhile, the first flow direction is opposite to the second flow direction, so that the phenomena that the heat exchange effect of part of the batteries in the split areas 121 is good and the heat exchange effect of part of the batteries in the split areas 121 is poor can be avoided, and the heat exchange of the direct cooling plate 100 on the plurality of batteries in the split areas 121 is more balanced.

According to some embodiments of the invention, each second flow path 13 comprises: a first flow path section 131, one end of the first flow path section 131 being in communication with the inlet 101, the other end of the first flow path section 131 extending in a first direction; a second flow path section 132, one end of the second flow path section 132 being connected to the other end of the first flow path section 131, the other end of the second flow path section 132 extending in a second direction; and a third flow path section 133, both ends of which are respectively communicated with the other end of the second flow path section 132 and the third flow path 14.

In some embodiments, each second flow path 13 is composed of a first flow path segment 131, a second flow path segment 132 and a third flow path segment 133, one end of the first flow path segment 131 is connected with the inlet 101, the other end of the first flow path segment 131 extends along a first direction, part of the first flow path segment 131 flows through the bottom of the battery to exchange heat with the battery, one end of the second flow path segment 132 is connected with the first flow path segment 131, the other end of the second flow path segment extends along a second direction, the second flow path segment 132 does not exchange heat with the battery without passing through the bottom of the battery, the other ends of the same sides of the second flow path segments 132 of the plurality of second flow paths 13 are mutually communicated, the first flow path segment 131 and the second flow path segment 132 can be respectively constructed into a plurality of channels on the straight cold plate 100, one end of the third flow path segment 133 is communicated with the other end of the second flow path segment 132, the other end of the third flow path segment 133 is communicated with the third flow path 14, part of the third flow path segment 133 extends along the first direction, at least one part of the third flow path segment 133 extends along the second direction, the other part of the second flow path segment 132 does not exchange heat with the battery, the other ends of the second flow path segment 132 do not pass through the bottom of the battery, the second flow path segment 132 and the other ends are mutually communicate with each other, the other ends of the same sides of the second flow path segments 132 can be mutually communicate, the second flow channels are mutually, and the medium can be mutually communicate, and the medium and the second flow channel segment and the third flow channel segment 132 can flow and the third flow channel 132 can flow channel and the second flow channel can.

According to some embodiments of the present invention, a plurality of heat exchange areas 15 are formed on the body of the direct cooling plate 100, and each heat exchange area 15 is provided with a first flow path 12, a second flow path 13 and a third flow path 14, a connection line between the inlet 101 and the outlet 102 is a symmetrical center line, and the plurality of heat exchange areas 15 are symmetrically disposed at two sides of the symmetrical center line.

In some embodiments, the body of the direct cooling plate 100 is provided with a plurality of heat exchange areas 15, each heat exchange area 15 is internally provided with a first flow path 12, a plurality of flow dividing areas 121, a second flow path 13 and a third flow path 14, the ranges of the heat exchange areas 15 are planned according to the number and the mode of arrangement of the batteries, and the connecting lines between the inlet 101 and the outlet 102 are used as the symmetrical centers, so that the heat exchange areas 15 are symmetrically arranged on two sides of the symmetrical centers, on one hand, the design difficulty of the direct cooling plate 100 is simplified, the manufacturing efficiency of the direct cooling plate 100 is improved, and on the other hand, the arrangement of the first flow path 12, the second flow path 13 and the third flow path 14 in the heat exchange areas 15 on the direct cooling plate 100 is more uniform, and the consistency of the temperatures of a plurality of batteries in the battery pack is ensured.

The battery pack according to the present invention is briefly described as follows.

According to the battery pack provided with the direct cooling plate 100 according to any one of the embodiments, the battery pack according to the invention is provided with the direct cooling plate 100 according to any one of the embodiments, and a plurality of battery modules are arranged in the battery pack, and the battery modules are sequentially arranged on the direct cooling plate 100 and exchange heat with the first flow path, so that when the direct cooling plate 100 arranged in the battery pack exchanges heat with a plurality of battery modules, the temperature difference between the heat exchange medium temperature in the first flow path 12 and the heat exchange medium temperature in the second flow path 13 is larger than the temperature difference between the heat exchange medium temperature in the first flow path 12 and the heat exchange medium temperature in the second flow path 13, the heat exchange medium temperature in the third flow path 14 is uniform, the temperature of each position on the direct cooling plate 100 is uniform, the temperature of the battery modules arranged at the inlet and outlet of the direct cooling plate is in an equalizing state, the temperature difference between the battery modules is not overheated or supercooled, the temperature difference between the battery modules is not more than a specific value, the safety and stability of the battery pack during operation are improved, and the service life of the battery pack is prolonged.

According to some embodiments of the present invention, a plurality of split areas 121 are formed on the direct cooling plate body, and a plurality of branch flow paths 122 extending in the first direction and arranged at intervals in the second direction, respectively, are provided in each split area 121, and the plurality of branch flow paths 122 communicate with each other to constitute the first flow path 12; the battery module is provided with a plurality of first electric cells 16 which are arranged at intervals in the first direction, each first electric cell 16 extends in the second direction and is arranged corresponding to at least part of at least one shunt area 121, and the first electric cell 16 exchanges heat with a branch flow path 122 in the shunt area 121.

In some embodiments, the direct cooling plate body is formed with a plurality of diversion areas 121, the diversion areas 121 are mutually communicated to form a first flow path 12, a plurality of branch flow paths 122 are arranged in each diversion area 121, it is understood that the heat exchange medium in the first flow path 12 can flow into one diversion area 121 first, the heat exchange medium flows in the diversion area 121 along the plurality of branch flow paths 122 arranged in the diversion area 121 and flows to the next diversion area 121, the plurality of branch flow paths 122 respectively extend along a first direction and are arranged at intervals in a second direction, so that the circulation path of the heat exchange medium in the first flow path 12 is prolonged, the residence time of the heat exchange medium in the plurality of diversion areas 121121 is prolonged, the utilization rate of the heat exchange medium is improved, and the vaporization time of the heat exchange medium is delayed; and be provided with a plurality of first electric core 16 in the battery module, every first electric core 16 extends in the second direction, and a plurality of first electric cores 16 are at first direction interval arrangement and with at least partial corresponding setting of at least one reposition of redundant personnel district 121, first electric core 16 carries out the heat transfer with a plurality of reposition of redundant personnel branch circuits in the reposition of redundant personnel district 121 to improved the heat transfer area of first electric core 16 and first flow path 12, improved the heat transfer effect of direct cooling board to the battery module.

According to some embodiments of the present invention, each of the shunt regions 121 has a width d in the second direction, and each of the first cells 16 has a length l in the second direction and is disposed opposite to the number n of the shunt regions 121, and satisfies: l=n×d.

In some embodiments, the width of each of the split areas 121 in the second direction is d, the number of split areas 121 disposed on the direct cooling plate body is n, and the length of each of the first cells 16 in the second direction is l and is disposed opposite to the number of n split areas 121, where l, n, d satisfy the following relation: l=n×d.

When l, n, d satisfy the above-mentioned relational expression, on the one hand because l, n, d satisfy the relation of integral multiple between the three for the structure that a plurality of reposition of redundant personnel district 121 arranged on the directly cooling plate is compacter, has improved the space utilization of directly cooling plate, and on the other hand first electric core 16 can span a plurality of reposition of redundant personnel district 121 setting to carry out the heat transfer simultaneously in a plurality of reposition of redundant personnel district 121, improved the heat exchange efficiency of directly cooling plate to first electric core 16, promoted the heat transfer effect of directly cooling plate to the battery module simultaneously.

According to some embodiments of the invention, the second flow path 13 is provided at one side of the split area 121 in the first direction; the battery module is provided with a second electric core, and the second electric core exchanges heat with the second flow path 13.

In some embodiments, the shunt area 121 is provided with a second flow path 13 at one side in the first direction, at least part of the second flow path 13 extends along the second direction, a second electric core is arranged in the battery module, the second electric core is opposite to the second flow path 13, and the second electric core exchanges heat with the second flow path 13, so that the heating or cooling of the second electric core is realized.

It should be noted that, compared with the temperature of the heat exchange medium in the second flow path 13 after the heat exchange with the second electric core and the temperature of the heat exchange medium in the first flow path 12 after the heat exchange with the first electric core 16, the temperature of the heat exchange medium in the first flow path 12 is higher, 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 communicated with the third flow path 14 and are mixed in the third flow path 14, so that the temperature of the heat exchange medium flowing to the outlet of the direct cooling plate from the third flow path 14 is uniform, the temperature of the direct cooling plate is uniform, the consistency of the temperatures of a plurality of battery modules in the battery pack is ensured, and the performance and service life of the battery modules are improved.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the invention, a "first feature" or "second feature" may include one or more of such features.

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

In the description of the invention, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the invention, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

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

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (13)

1. A direct cooling plate (100) for a battery pack, comprising:

a direct cooling plate (100) body, wherein a first flow path (12) and a second flow path (13) which are respectively communicated with an inlet (101) are formed on the direct cooling plate (100), and the first flow path (12) is suitable for exchanging heat with a battery (16);

the direct cooling plate (100) is further provided with a third flow path (14) communicated with the outlet (102), and the third flow path (14) is communicated with the first flow path (12) and the second flow path (13) respectively so as to be suitable for mixing heat exchange media 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, wherein 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 is satisfied: q1 is less than or equal to Q2.

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

4. The direct cooling plate (100) for a battery pack according to claim 2, wherein 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 following are satisfied: i3 < (i1+i2).

5. The direct cooling plate (100) for a battery pack according to claim 1, wherein a plurality of split areas (121) are formed on the direct cooling plate (100) body, a plurality of branch flow paths (122) respectively extending in a first direction and arranged at intervals in a second direction are provided in each of the split areas (121), and the plurality of branch flow paths (122) communicate with each other to constitute the first flow path (12).

6. The direct cooling plate (100) for a battery pack according to claim 5, wherein the branch flow paths (122) in the adjacent two of the split areas (121) are arranged in series with each other.

7. The direct cooling plate (100) for a battery pack according to claim 6, wherein a plurality of the branch flow paths (122) connected in parallel to each other are provided in each of the flow dividing regions (121); wherein the method comprises the steps of

The flow direction of the heat exchange medium in the branch flow path (122) in the same flow dividing region (121) is the same and the flow direction of the heat exchange medium in the branch flow path (122) in the adjacent two flow dividing regions (121) is opposite.

8. The direct cooling plate (100) for a battery pack according to claim 1, wherein each of the second flow paths (13) includes:

-a first flow channel section (131), one end of the first flow channel section (131) being in communication with the inlet (101), the other end of the first flow channel section (131) extending in a first direction;

a second flow path section (132), one end of the second flow path section (132) being connected to the other end of the first flow path section (131), the other end of the second flow path section (132) extending in a second direction;

and a third flow passage section (133) having both ends communicating with the other end of the second flow passage section (132) and the third flow passage (14), respectively.

9. The direct cooling plate (100) for a battery pack according to claim 1, wherein a plurality of heat exchange areas (15) are formed on the direct cooling plate (100) body, the first flow path (12), the second flow path (13) and the third flow path (14) are arranged in each heat exchange area (15), a connecting line between the inlet (101) and the outlet (102) is a symmetrical center line, and a plurality of heat exchange areas (15) are symmetrically arranged on two sides of the symmetrical center line.

10. A battery pack, comprising

A battery module;

a direct cooling plate (100), the direct cooling plate (100) being configured as a direct cooling plate (100) according to any one of claims 1-9; wherein the method comprises the steps of

The battery modules are configured in plurality and are sequentially arranged on the direct cooling plate (100) and exchange heat with the first flow path.

11. The battery pack according to claim 10, wherein a plurality of split areas (121) are formed on the direct cooling plate (100) body, a plurality of branch flow paths (122) extending in the first direction and arranged at intervals in the second direction, respectively, are provided in each of the split areas (121), and the plurality of branch flow paths (122) communicate with each other to constitute the first flow path (12);

the battery module is provided with a plurality of first electric cores (16) which are arranged at intervals in a first direction, each first electric core (16) extends in a second direction and is arranged corresponding to at least part of at least one flow dividing area, and the first electric cores (16) exchange heat with the branch flow paths (122) in the flow dividing areas.

12. The battery pack according to claim 11, wherein each of the shunt regions has a width d in the second direction, and each of the first cells (16) has a length l in the second direction and is disposed opposite the number n of shunt regions, and satisfies: l=n×d.

13. The battery pack according to claim 11, wherein the second flow path (13) is provided at one side of the split area in the first direction; the battery module is provided with a second electric core, and the second electric core exchanges heat with the second flow path (13).