Cooling plate, energy storage device and electric equipment

Abstract

The invention discloses a cooling plate, an energy storage device and electric equipment. The cooling plate is used for cooling the battery pack. The cooling plate comprises a first cooling plate and a second cooling plate, and the battery pack is arranged on the first cooling plate. A dynamic flow channel extending in a bent mode is formed between the first cold plate and the second cold plate. The dynamic flow channel comprises a main flow channel and a secondary flow channel arranged on the side edge of the main flow channel. The second cooling plate comprises a bent protruding section protruding towards the first cooling plate in the height direction of the cooling plate. The bent protruding section is located between the main flow channel and the secondary flow channel, and a micro-channel opening is formed between the bent protruding section and the first cold plate. And the height of the micro-channel opening is smaller than that of the main flow channel and that of the secondary flow channel. Therefore, the local cooling effect of the cooling plate can be effectively improved, the temperature difference between the battery cells is reduced, the influence of the temperature difference on the service life of the battery cells is reduced, and the relationship among the expansion force, the temperature difference between the battery cells and the service life of the battery cells is balanced.

Description

Technical Field

[0001] The present application relates to the technical field of battery cooling, and in particular to a cooling plate, an energy storage device and an electrical equipment. Background Art

[0002] A battery pack usually has multiple cells. The chemical reactions that occur during the charging and discharging process will cause the cells to continue to expand. The higher the temperature of the cells, the greater the expansion force. If there is a temperature difference between different cells, the expansion force of different parts of the battery pack will be different, affecting the normal operation and cycle life of the battery pack. How to balance the temperature difference between cells is a problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide a cooling plate, an energy storage device and an electrical device to solve at least one of the above-mentioned technical problems.

[0004] The cooling plate of the embodiment of the present application is used to cool the battery pack, the cooling plate includes a first cold plate and a second cold plate, the battery pack is arranged on the first cold plate, a dynamic flow channel extending in a bent state is constructed between the first cold plate and the second cold plate, the dynamic flow channel includes a main flow channel and a secondary flow channel arranged on the side of the main flow channel;

[0005] The second cold plate includes a bent protrusion section protruding toward the first cold plate along the height direction of the cooling plate, the bent protrusion section is located between the main flow channel and the secondary flow channel, and a microchannel opening is formed between the bent protrusion section and the first cold plate, and the height of the microchannel opening is smaller than the height of the main flow channel and the height of the secondary flow channel.

[0006] In the cooling plate of the embodiment of the present application, a dynamic flow channel is formed between the first cold plate and the second cold plate, and the dynamic flow channel includes a main flow channel and a secondary flow channel. The bent protrusion section is located between the main flow channel and the secondary flow channel, and a microchannel opening is formed between the bent protrusion section and the first cold plate. When the battery pack heats up and expands, the expansion force of the battery pack acts on the cooling plate, squeezing the first cold plate, and the microchannel opening with a smaller height is closed due to the squeezing effect, and the coolant no longer enters the secondary flow channel. The flow rate of the coolant in the main flow channel remains unchanged, and the flow rate increases. In this way, the local cooling effect of the cooling plate can be effectively improved, the temperature difference between the battery cells can be reduced, and the influence of the temperature difference on the life of the battery cells can be reduced, and the relationship between the expansion force, the temperature difference between the battery cells, and the life of the battery cells can be balanced.

[0007] In certain embodiments, the height of the primary flow channel is greater than the height of the secondary flow channel.

[0008] In the above technical solution, the height of the main channel is greater than that of the secondary channel, which is conducive to forming a larger flow rate in the main channel. When the microchannel port is closed, more coolant can pass through the main channel, thereby effectively improving the local cooling effect of the cooling plate.

[0009] In some embodiments, the second cold plate includes a first bending section connected to one end of the bending protrusion section, and the main flow channel is formed between the first bending section and the first cold plate;

[0010] The second cold plate includes a second bending section connected to the other end of the bending protrusion section, and the secondary flow channel is formed between the second bending section and the first cold plate.

[0011] In the above technical solution, the main flow channel is formed by the first bending section and the first cold plate, and the secondary flow channel is formed by the second bending section and the first cold plate, so that the flow path of the coolant is clearer, which is conducive to the precise distribution and control of the flow rate.

[0012] In some embodiments, the second cold plate includes a connecting section, and the connecting section is disposed at an end of the second bending section away from the bending protrusion section;

[0013] Along the height direction of the cooling plate, the connecting section abuts against the first cold plate.

[0014] In the above technical solution, the connecting section abuts against the first cold plate, making the structure of the cooling plate more stable, while preventing the coolant from flowing out of the secondary flow channel along the gap between the connecting section and the first cold plate, or external impurities from entering the secondary flow channel through the gap between the connecting section and the first cold plate.

[0015] In some embodiments, the secondary flow channel includes a primary flow channel and a secondary flow channel, and the primary flow channel and the secondary flow channel are respectively disposed on both sides of the primary flow channel in the width direction.

[0016] In the above technical solution, the secondary flow channel is divided into the first flow channel and the second flow channel on both sides of the width direction of the main flow channel, and the number of microchannel openings is also two, which are respectively located between the main flow channel and the first flow channel, and between the main flow channel and the second flow channel. When the battery pack heats up and expands, the expansion force of the battery pack acts on the cooling plate, squeezing the first cold plate. The two microchannel openings are closed due to the squeezing effect, and the coolant no longer enters the first flow channel and the second flow channel. The flow rate of the coolant in the main flow channel is relatively increased and the flow rate is accelerated. In this way, the local cooling effect of the cooling plate can be further improved, the temperature difference between the battery cells can be reduced, and the influence of the temperature difference on the life of the battery cells can be reduced, and the relationship between the expansion force, the temperature difference between the battery cells and the life of the battery cells can be balanced.

[0017] In some embodiments, the cooling plate further includes a water inlet and a water outlet, a cooling channel extending in a bent shape is configured between the first cold plate and the second cold plate, and the cooling channel connects the water inlet and the water outlet;

[0018] The dynamic flow channel is a partial flow channel of the cooling flow channel.

[0019] In the above technical solution, part of the cooling channel is a dynamic channel, and the coolant flows into the cooling channel from the water inlet, passes through the dynamic channel during the flow along the cooling channel, and then flows out of the cooling plate through the water outlet. In this way, the local cooling effect of the cooling plate can be effectively improved, and the dynamic channel can be set at the corresponding position where the temperature difference is likely to occur according to the needs.

[0020] In some embodiments, along the liquid flow direction of the cooling channel, the cooling channel includes a first main path and multiple second main paths branching from the first main path, the first main path is connected to the water inlet, and the dynamic channel is arranged in the multiple second main paths.

[0021] In the above technical solution, at least one dynamic flow channel is correspondingly provided for each second main path, so that the dynamic flow channel on each second main path can cool different parts of the battery pack respectively.

[0022] In some embodiments, along the liquid flow direction of the cooling channel, the cooling channel includes a plurality of third main paths and a fourth main path formed by the confluence of the plurality of third main paths, the fourth main path is connected to the water outlet, and the dynamic flow channel is arranged in the plurality of third main paths and the fourth main path.

[0023] In the above technical solution, at least one dynamic flow channel is correspondingly provided on each third main path and each fourth main path, so that the dynamic flow channels on each third main path and each fourth main path can cool different parts of the battery pack respectively.

[0024] In certain embodiments, the cooling plate includes a first end and a second end opposite to each other along a length direction;

[0025] The dynamic flow channel includes a first dynamic flow channel located at the first end and a second dynamic flow channel located at the second end;

[0026] In the first dynamic flow channel, the height of the microchannel opening is a first height; in the second dynamic flow channel, the height of the microchannel opening is a second height;

[0027] The first height is different from the second height.

[0028] In the above technical solution, the dynamic flow channel includes a first dynamic flow channel located at the first end and a second dynamic flow channel located at the second end, which respectively correspond to the two ends of the battery pack with larger expansion force. In this way, the cooling effect of the cooling plate is enhanced on the part of the battery pack with large expansion force, the temperature difference between the battery cells is reduced, and the influence of the temperature difference on the life of the battery cells is reduced, thereby balancing the relationship between the expansion force, the temperature difference between the battery cells and the life of the battery cells. Furthermore, by reducing the temperature difference between the battery cells, the allowable tolerance of the internal resistance between the battery cells when the battery cells are grouped can also be increased.

[0029] In addition, the first height is different from the second height, and the first height and the second height can be set according to the expansion force generated at both ends of the battery pack in the length direction. In this way, the microchannel openings of the first dynamic flow channel and the second dynamic flow channel have different opening and closing thresholds, thereby regulating the expansion force at both ends of the battery pack in the length direction.

[0030] In certain embodiments, the cooling plate includes a first end and a second end opposite to each other along a length direction;

[0031] The dynamic flow channel includes a first dynamic flow channel located at the first end and a second dynamic flow channel located at the second end;

[0032] In the first dynamic flow channel, the width of the microchannel opening is a first width; in the second dynamic flow channel, the width of the microchannel opening is a second width;

[0033] The first width is different from the second width.

[0034] In the above technical solution, the first width is different from the second width, and the specific value can be determined according to the simulation situation and the specific design of the battery pack. In this way, the microchannel openings of the first dynamic flow channel and the second dynamic flow channel have different opening and closing thresholds, thereby respectively regulating the expansion force at both ends of the length direction of the battery pack.

[0035] The energy storage device of the embodiment of the present application includes:

[0036] Battery pack; and

[0037] The cooling plate of any of the above embodiments is arranged at the bottom of the battery pack.

[0038] The electrical equipment of the implementation mode of the present application includes the above-mentioned energy storage device.

[0039] In the cooling plate, energy storage device and electrical equipment of the embodiments of the present application, a dynamic flow channel is formed between the first cold plate and the second cold plate, and the dynamic flow channel includes a main flow channel and a secondary flow channel. The bent protrusion section is located between the main flow channel and the secondary flow channel, and a microchannel opening is formed between the bent protrusion section and the first cold plate. When the battery pack heats up and expands, the expansion force of the battery pack acts on the cooling plate, squeezing the first cold plate, and the microchannel opening with a smaller height is closed due to the squeezing effect, and the coolant no longer enters the secondary flow channel. The flow rate of the coolant in the main flow channel remains unchanged, and the flow rate increases. In this way, the local cooling effect of the cooling plate can be effectively improved, the temperature difference between the battery cells can be reduced, and the influence of the temperature difference on the life of the battery cells can be reduced, and the relationship between the expansion force, the temperature difference between the battery cells and the life of the battery cells can be balanced.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. Among them:

[0042] Figure 1 is a schematic diagram of the exploded structure of a cooling plate according to certain embodiments of the present application;

[0043] Figure 2 is a schematic structural diagram of a second cold plate in certain embodiments of the present application;

[0044] Figure 3 is a schematic cross-sectional structure diagram of a secondary flow channel in an open state in a dynamic flow channel of certain embodiments of the present application;

[0045] Figure 4 is a schematic cross-sectional structure diagram of a secondary flow channel in a closed state in a dynamic flow channel of certain embodiments of the present application;

[0046] Figure 5 is a schematic diagram of a module of an energy storage device according to some embodiments of the present application;

[0047] Figure 6 yes Figure 2 A schematic diagram of the partially enlarged structure of part VI;

[0048] Figure 7 yes Figure 2 A schematic diagram of the local enlarged structure of position A in the middle;

[0049] Figure 8 yes Figure 2 A schematic diagram of the local enlarged structure of position B in the middle;

[0050] Fig. 9 yes Figure 2 A schematic diagram of the local enlarged structure of the middle position C;

[0051] Fig.10 yes Figure 2 A schematic diagram of the local enlarged structure of the middle position D;

[0052] Fig.11 yes Figure 2 A schematic diagram of the local enlarged structure of the middle position E;

[0053] Fig.12 yes Figure 2 A schematic diagram of the local enlarged structure of the middle position F;

[0054] Fig.13 yes Figure 2 A schematic diagram of the local enlarged structure of the middle position G;

[0055] Fig.14 is a schematic structural diagram of a first dynamic flow channel in certain embodiments of the present application;

[0056] Fig.15 is a schematic structural diagram of a second dynamic flow channel in certain embodiments of the present application;

[0057] Fig.16 It is a module schematic diagram of an electrical equipment in certain embodiments of the present application.

[0058] Description of reference numerals:

[0059] Cooling plate 100, dynamic flow channel 11, main flow channel 111, secondary flow channel 112, first flow channel 1121, second flow channel 1122, microchannel port 113, first dynamic flow channel 114, second dynamic flow channel 115, cooling flow channel 12, first main path 121, second main path 122, third main path 123, fourth main path 124, first cold plate 13, second cold plate 14, bent protrusion section 141, first bent section 142, second bent section 143, connecting section 144, first end 17, second end 18, water inlet 20, water outlet 30, energy storage device 200, battery pack 210, electrical equipment 1000. DETAILED DESCRIPTION

[0060] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0061] See also Figures 1 to 5 , an embodiment of the present application provides a cooling plate 100 for cooling a battery pack 210. The cooling plate 100 includes a first cold plate 13 and a second cold plate 14. The battery pack 210 is disposed on the first cold plate 13. A dynamic flow channel 11 extending in a bent shape is constructed between the first cold plate 13 and the second cold plate 14. The dynamic flow channel 11 includes a main flow channel 111 and a secondary flow channel 112 disposed on the side of the main flow channel 111. The second cold plate 14 includes a bent protrusion section 141 protruding toward the first cold plate 13 along the height direction of the cooling plate 100. The bent protrusion section 141 is located between the main flow channel 111 and the secondary flow channel 112, and a microchannel opening 113 is formed between the bent protrusion section 141 and the first cold plate 13. The height of the microchannel opening 113 is less than the height of the main flow channel 111 and the height of the secondary flow channel 112.

[0062] In the cooling plate 100 of the embodiment of the present application, a dynamic flow channel 11 is formed between the first cold plate 13 and the second cold plate 14, and the dynamic flow channel 11 includes a main flow channel 111 and a secondary flow channel 112. The bent protrusion section 141 is located between the main flow channel 111 and the secondary flow channel 112, and a microchannel opening 113 is formed between the bent protrusion section 141 and the first cold plate 13. When the battery pack 210 heats up and expands, the expansion force of the battery pack 210 acts on the cooling plate 100, squeezing the first cold plate 13, and the microchannel opening 113 with a smaller height is closed due to the squeezing effect, and the coolant no longer enters the secondary flow channel 112. The flow rate of the coolant in the main flow channel 111 remains unchanged, and the flow rate increases. In this way, the local cooling effect of the cooling plate 100 can be effectively improved, the temperature difference between the battery cells can be reduced, and the influence of the temperature difference on the life of the battery cells can be reduced, and the relationship between the expansion force, the temperature difference between the battery cells, and the life of the battery cells can be balanced.

[0063] Specifically, the cooling plate 100 can be disposed at the bottom of the battery pack 210 to cool the battery pack 210 during the charging and discharging process of the battery pack 210. The battery pack 210 includes a plurality of battery modules, each of which includes a plurality of battery cells. The battery cells will generate expansion force during the charging and discharging process, causing the battery pack 210 to expand, and the expansion force at the bottom of the battery pack 210 acts on the cooling plate 100. It should be noted that the expansion force of the battery pack 210 is positively correlated with the temperature of the battery pack 210. During the charging and discharging process of the battery pack 210, there is a temperature difference between different battery cells, and the expansion force of different parts of the battery pack 210 is different.

[0064] The cooling plate 100 includes a first cold plate 13 and a second cold plate 14. The battery pack 210 is disposed on the first cold plate 13, and the bottom of the battery pack 210 can be bonded to the first cold plate 13 by thermally conductive adhesive. The first cold plate 13 is covered with the second cold plate 14, and a dynamic flow channel 11 extending in a curved shape is constructed between the first cold plate 13 and the second cold plate 14 for the flow of coolant. The dynamic flow channel 11 can be disposed at a local position of the cooling plate 100, for example, at a position of the cooling plate 100 corresponding to a battery cell with a higher temperature. The dynamic flow channel 11 includes a main flow channel 111 and a secondary flow channel 112 disposed on the side of the main flow channel 111.

[0065] The second cold plate 14 includes a bent protrusion section 141 protruding toward the first cold plate 13 along the height direction of the cold plate 100. The bent protrusion section 141 is located between the main flow channel 111 and the secondary flow channel 112, and a microchannel opening 113 is formed between the bent protrusion section 141 and the first cold plate 13. The microchannel opening 113 has two states: open and closed. The height of the microchannel opening 113 is less than the height of the main flow channel 111 and the height of the secondary flow channel 112. Figure 3 As shown, the height h3 of the microchannel opening 113 is less than the height h1 of the main channel 111, and the height h3 of the microchannel opening 113 is less than the height h2 of the secondary channel 112. When the depths of the main channel 111, the secondary channel 112, and the microchannel opening 113 are different at various locations along the channel width direction, the depths of the main channel 111, the secondary channel 112, and the microchannel opening 113 may refer to the maximum depths of the main channel 111, the secondary channel 112, and the microchannel opening 113.

[0066] The main flow channel 111 is in a normally open state, and the opening and closing state of the secondary flow channel 112 is related to the opening and closing state of the micro-channel opening 113, and the opening and closing state of the micro-channel opening 113 is related to the expansion force of the battery pack 210. The position of the dynamic flow channel 11 on the cooling plate 100 can be as follows: Figure 2 As shown in position A, position B, position C, position D, position E, position F and position G.

[0067] In some examples, the battery pack 210 may have a first expanded state and a second expanded state, and the expansion force of the second expanded state is greater than the expansion force of the first expanded state.

[0068] The first expansion state is, for example, a static state of the battery pack 210, that is, a state in which the battery pack 210 is not charged or discharged, and there is no need to adjust the expansion force of the battery pack 210 to a large extent. When the battery pack 210 is in the first expansion state, the expansion force of the battery pack 210 acts on the cooling plate 100, and the first cold plate 13 is not squeezed by the battery pack 210 or is squeezed to a small extent, such as Figure 3As shown, the first cold plate 13 is spaced apart from the bent protrusion section 141, and the microchannel opening 113 is in an open state. The coolant can enter the secondary channel 112 from the main channel 111 through the microchannel opening 113, so that the main channel 111 and the secondary channel 112 are both in an open state. The coolant can flow in the main channel 111 and the secondary channel 112, and the flow rate is slower due to the diversion effect of the secondary channel 112.

[0069] The second expansion state is, for example, the charge and discharge state of the battery pack 210. The battery cell absorbs heat and expands during the charge and discharge process, the temperature of the battery cell increases, the expansion force of the entire battery module increases, and the expansion amount of the bottom shell of the battery pack 210 increases. When the battery pack 210 is in the second expansion state, the expansion force of the battery pack 210 acts on the cooling plate 100, and the first cold plate 13 is squeezed to a greater extent by the battery pack 210, such as Figure 4 As shown, the first cold plate 13 is fitted with the bent protrusion section 141, and the microchannel opening 113 is in a closed state. The coolant cannot enter the secondary channel 112 from the main channel 111 through the microchannel opening 113, so that the main channel 111 is in an open state and the secondary channel 112 is in a closed state. The coolant can only flow in the main channel 111 at a faster flow rate.

[0070] When the battery pack 210 is charged and discharged, the battery pack 210 returns to the first expansion state from the second expansion state, the degree of compression of the first cold plate 13 by the battery pack 210 gradually decreases, the first cold plate 13 is spaced apart from the bent protrusion section 141, and the microchannel opening 113 returns to the open state, so that the coolant can flow in the main flow channel 111 and the secondary flow channel 112. Under the diversion effect of the secondary flow channel 112, the flow rate is slow.

[0071] In a specific example, expansion force test sensors are added to the two battery modules of the battery pack 210, and the battery pack 210 is charged and discharged for 58 cycles. It is found that the starting value of the expansion force of the first battery module is 204Kg and the maximum value is 560Kg; the starting value of the expansion force of the second battery module is 98Kg and the maximum value is 461Kg. For the first battery module, the expansion force threshold for distinguishing the first expansion state and the second expansion state can be set between 204Kg-560Kg. For the second battery module, the expansion force threshold for distinguishing the first expansion state and the second expansion state can be set between 98Kg-461Kg. The expansion force threshold is also the threshold that closes the secondary flow channel 112.

[0072] In the embodiment of the present application, a dynamic flow channel 11 is formed between the first cold plate 13 and the second cold plate 14, and the dynamic flow channel 11 can be set at the position of the cooling plate 100 corresponding to the battery cell with higher temperature. According to the expansion state of the battery pack 210, the dynamic flow channel 11 can be in different states. When the battery pack 210 is in the first expansion state, the microchannel port 113 is in an open state under the action of the expansion force of the battery pack 210, so that the main channel 111 and the secondary channel 112 are both in an open state; when the battery pack 210 is in the second expansion state, the expansion force of the battery pack 210 acts on the cooling plate 100, squeezing the first cold plate 13, and the microchannel port 113 is in a closed state due to the squeezing effect, so that the main channel 111 is in an open state, the secondary channel 112 is in a closed state, the flow rate of the coolant in the main channel 111 remains unchanged, and the flow rate increases. When the flow rate of the coolant remains unchanged, the flow rate of the main channel 111 increases, which can increase the convective heat transfer between the coolant and the battery pack 210, so that the heat is transferred from the bottom of the battery pack 210 to the coolant more quickly. In this way, the local cooling effect of the cooling plate 100 is effectively improved, the temperature difference between the battery cells is reduced, and the influence of the temperature difference on the life of the battery cells is reduced, and the relationship between the expansion force, the temperature difference between the battery cells and the life of the battery cells is balanced.

[0073] See also Figure 3 and Figure 4 In some embodiments, the height of the main flow channel 111 is greater than the height of the secondary flow channel 112 .

[0074] In the above technical solution, the height h1 of the main channel 111 is greater than the height h2 of the secondary channel 112 , which is conducive to forming a larger flow rate in the main channel 111 . When the microchannel port 113 is closed, more coolant can pass through the main channel 111 , thereby effectively improving the local cooling effect of the cooling plate 100 .

[0075] In some embodiments, the second cold plate 14 includes a first bending section 142 connected to one end of the bending protrusion section 141, and a main flow channel 111 is formed between the first bending section 142 and the first cold plate 13. The second cold plate 14 includes a second bending section 143 connected to the other end of the bending protrusion section 141, and a secondary flow channel 112 is formed between the second bending section 143 and the first cold plate 13. The height of the main flow channel 111 is the height between the first bending section 142 and the first cold plate 13, and the height of the secondary flow channel 112 is the height between the second bending section 143 and the first cold plate 13.

[0076] In the above technical solution, the main channel 111 is formed by the first bending section 142 and the first cold plate 13, and the secondary channel 112 is formed by the second bending section 143 and the first cold plate 13, so that the flow path of the coolant is clearer, which is conducive to the precise distribution and control of the flow rate.

[0077] In some embodiments, the second cold plate 14 includes a connecting section 144, which is disposed at an end of the second bending section 143 away from the bending protrusion section 141. Along the height direction of the cooling plate 100, the connecting section 144 abuts against the first cold plate 13. The connecting section 144 and the first cold plate 13 may be fixedly connected by brazing.

[0078] In the above technical solution, the connecting section 144 abuts against the first cold plate 13, so that the structure of the cooling plate 100 is more stable, and at the same time prevents the coolant from flowing out of the secondary channel 112 along the gap between the connecting section 144 and the first cold plate 13, or external impurities from entering the secondary channel 112 through the gap between the connecting section 144 and the first cold plate 13.

[0079] See also Figure 3 and Figure 4 In some embodiments, the secondary flow channel 112 includes a first flow channel 1121 and a second flow channel 1122 , and the first flow channel 1121 and the second flow channel 1122 are respectively arranged on both sides of the width direction of the main flow channel 111 .

[0080] In the above technical solution, the secondary flow channel 112 is divided into a first flow channel 1121 and a second flow channel 1122 on both sides of the width direction of the main flow channel 111, and the number of microchannel openings 113 is also two, which are respectively located between the main flow channel 111 and the first flow channel 1121, and between the main flow channel 111 and the second flow channel 1122. When the battery pack 210 heats up and expands, the expansion force of the battery pack 210 acts on the cooling plate 100, squeezing the first cold plate 13, and the two microchannel openings 113 are closed due to the squeezing effect, and the coolant no longer enters the first flow channel 1121 and the second flow channel 1122. The flow rate of the coolant in the main flow channel 111 remains unchanged, and the flow rate increases. In this way, the local cooling effect of the cooling plate 100 can be further improved, the temperature difference between the battery cells can be reduced, and the influence of the temperature difference on the life of the battery cells can be reduced, and the relationship between the expansion force, the temperature difference between the battery cells, and the life of the battery cells can be balanced.

[0081] In some examples, when the battery pack 210 is in the first expansion state, the first flow channel 1121 and the second flow channel 1122 are both in an open state, and the coolant flows in the main flow channel 111, the first flow channel 1121, and the second flow channel 1122 at a relatively slow flow rate; when the battery pack 210 is in the second expansion state, the first flow channel 1121 and the second flow channel 1122 are both in a closed state, and the coolant flows only in the main flow channel 111 at a relatively fast flow rate. According to the different states of the first flow channel 1121 and the second flow channel 1122, the flow rate of the coolant can be adjusted, and thus the cooling effect of the coolant can be adjusted.

[0082] See also Figures 1 to 4In some embodiments, the cooling plate 100 further includes a water inlet 20 and a water outlet 30. A cooling channel 12 extending in a curved manner is configured between the first cold plate 13 and the second cold plate 14. The cooling channel 12 connects the water inlet 20 and the water outlet 30. The dynamic channel 11 is a partial channel of the cooling channel 12.

[0083] Specifically, the cooling plate 100 further includes a water inlet 20 and a water outlet 30, and the number of the water inlet 20 and the water outlet 30 can both be 1. The water inlet 20 and the water outlet 30 are arranged at the ends of the cooling plate 100 along the length direction, and the water inlet 20 and the water outlet 30 can be arranged at the same end, which is convenient for managing the water inlet 20 and the water outlet 30.

[0084] A cooling channel 12 is formed between the first cold plate 13 and the second cold plate 14. Specifically, the cooling channel 12 can be formed by stamping the second cold plate 14 and brazing the first cold plate 13 and the second cold plate 14. In this way, the structure of the cooling plate 100 can be lightweight and the cooling plate 100 has a higher strength. The cooling channel 12 connects the water inlet 20 and the water outlet 30, and the dynamic channel 11 is a partial channel of the cooling channel 12. For example, for the battery cells with higher temperatures in the battery pack 210, the cooling channel 12 at the corresponding position of the cooling plate 100 is set as the dynamic channel 11 to increase the cooling effect on the corresponding battery cells. The coolant flows into the cooling plate 100 from the water inlet 20, flows along the cooling channel 12, passes through the dynamic channel 11 during the flow process, and then flows out of the cooling plate 100 through the water outlet 30. In this way, the local cooling effect of the cooling plate 100 can be effectively improved, the temperature difference and expansion force between different batteries in the battery pack 210 can be balanced, and the battery life can be improved.

[0085] See also Figure 2 , Figures 6 to 9 In some embodiments, along the liquid flow direction of the cooling channel 12, the cooling channel 12 includes a first main path 121 and a plurality of second main paths 122 branching from the first main path 121. The first main path 121 is connected to the water inlet 20, and the dynamic channel 11 is disposed in the plurality of second main paths 122.

[0086] Specifically, the cooling channel 12 includes a first main path 121 and a plurality of second main paths 122 branched from the first main path 121. The first main path 121 is connected to the water inlet 20. The coolant enters the cooling plate 100 from the water inlet 20, flows through the first main path 121, and is branched to the plurality of second main paths 122. The dynamic flow channel 11 is arranged on the plurality of second main paths 122 and is arranged close to the first main path 121. At least one dynamic flow channel 11 is correspondingly arranged for one second main path 122. In this way, the dynamic flow channel 11 on each second main path 122 can cool different parts of the battery pack 210 respectively.

[0087] It should be noted that there is no limit on the number of the second main paths 122. In one example, Figure 2 As shown, the number of the second main paths 122 is 3, and each second main path 122 is provided with a dynamic flow channel 11. Figure 2 Position A, position B, and position C respectively represent the positions where the dynamic flow channels 11 are set on the three second main paths 122 .

[0088] See also Figure 2 , Figures 10 to 13 In some embodiments, along the liquid flow direction of the cooling channel 12, the cooling channel 12 includes a plurality of third main paths 123 and a fourth main path 124 formed by the confluence of the plurality of third main paths 123. The fourth main path 124 is connected to the water outlet 30, and the dynamic channel 11 is disposed on the plurality of third main paths 123 and the fourth main path 124.

[0089] Specifically, the cooling channel 12 includes a plurality of third main paths 123 and a fourth main path 124 formed by the confluence of the plurality of third main paths 123. The plurality of third main paths 123 may correspond to the plurality of second main paths 122 one by one. The plurality of third main paths 123 converge to form a fourth main path 124, and the fourth main path 124 is connected to the water outlet 30. In one example, the third main path 123 is also the second main path 122. The coolant enters from the water inlet 20, flows through the first main path 121, is diverted to the plurality of second main paths 122 (third main paths 123), converges into one path, forms the fourth main path 124, and then flows out from the water outlet 30.

[0090] The dynamic flow channel 11 may be disposed in the plurality of third main paths 123 and the fourth main path 124. The dynamic flow channel 11 disposed in the plurality of third main paths 123 is disposed close to the fourth main path 124, and the dynamic flow channel 11 disposed in the fourth main path 124 is disposed close to the plurality of third main paths 123. In this way, the dynamic flow channel 11 on each third main path 123 and the fourth main path 124 may cool different parts of the battery pack 210 respectively.

[0091] It should be noted that there is no limit on the number of the third main roads 123. In an example, Figure 2 As shown, the number of the third main paths 123 is 3, and each third main path 123 is provided with a dynamic flow channel 11. Figure 2 Position D, position E and position F respectively represent the positions where the dynamic flow channels 11 are set on the three third main paths 123 , and position G represents the position where the dynamic flow channel 11 is set on the fourth main path 124 .

[0092] See also Figure 3 , Fig.14 and Fig.15In some embodiments, the cooling plate 100 includes a first end 17 and a second end 18 opposite to each other along the length direction. The dynamic flow channel 11 includes a first dynamic flow channel 114 located at the first end 17 and a second dynamic flow channel 115 located at the second end 18. In the first dynamic flow channel 114, the height of the microchannel opening 113 is a first height. In the second dynamic flow channel 115, the height of the microchannel opening 113 is a second height. The first height is different from the second height.

[0093] In the related art, the expansion force is not taken into account during the design of the cooling plate. Only the flow uniformity of the cooling plate is simulated to ensure that the coolant flow of each battery cell is consistent. It is ignored that the heat generation between the battery cells after the battery pack is formed is inconsistent, and the heat exchange between different battery cells and the cooling plate is also different, which will cause high temperature and low temperature areas in the battery pack.

[0094] Research has found that during the charging and discharging process of some battery packs, the temperature of the cells at the two ends of the length direction is higher, while the temperature of the cells in the middle is relatively lower. The expansion force of the cells with higher temperatures is greater than that of the cells with lower temperatures, and long-term charging and discharging is very unfavorable to the cells with higher temperatures.

[0095] Therefore, in the embodiment of the present application, a dynamic flow channel 11 is designed in the cooling plate 100 for the high temperature zone during the charging and discharging process of the battery pack 210. Specifically, the cooling plate 100 includes a first end 17 and a second end 18 opposite to each other along the length direction, which correspond to the two ends of the battery pack 210 along the length direction. The dynamic flow channel 11 includes a first dynamic flow channel 114 located at the first end 17 and a second dynamic flow channel 115 located at the second end 18, as shown in FIG. Figure 2 As shown, the dynamic flow channels 11 at positions A, B and C are first dynamic flow channels 114 located at the first end 17 , and the dynamic flow channels 11 at positions D, E, F and G are second dynamic flow channels 115 located at the second end 18 .

[0096] In this way, the cooling effect of the cooling plate 100 is enhanced for the part of the battery pack 210 with large expansion force, the expansion force of the battery cells is effectively reduced, the temperature difference between the battery cells is reduced, and the relationship between the expansion force, the temperature difference between the battery cells and the battery life is balanced; further, by reducing the temperature difference between the battery cells, the allowable tolerance of the internal resistance between the battery cells when the battery cells are grouped can also be increased.

[0097] In the first dynamic flow channel 114, the height of the microchannel opening 113 is a first height h31. In the second dynamic flow channel 115, the height of the microchannel opening 113 is a second height h32. By simulating the cooling plate 100, the relationship between the deformation amount at the position corresponding to the first cold plate 13 and each microchannel opening 113 and the longitudinal pressure (i.e., expansion force) can be determined to set the first height h31 and the second height h32, and then according to the different expansion forces of the battery pack 210, the microchannel opening 113 can be in different states. It can be understood that the expansion forces generated at both ends of the length direction of the battery pack 210 may be different, so the first height h31 and the second height h32 can be set differently.

[0098] It has been found that when the coolant in the cooling plate 100 is heated and expanded, when the pressure exceeds 0.4Mpa (equivalent to 4kg of pressure), the longitudinal deformation of the first cold plate 13 is 0.134mm. The battery pack 210 is inflated and circulated, and a single battery module is circulated 5 times at a pressure of 300KPa. The side of the battery module expands by 2.4mm-2.7mm. The conversion is based on the ratio of the side area to the bottom area of ​​the battery module, and considering that the thermal conductive glue between the bottom of the battery pack 210 and the first cold plate 13 reduces the expansion force to a certain extent, the first height h31 and the second height h32 can be set between 1mm-2mm.

[0099] In this way, according to the expansion force generated at both ends of the battery pack 210 in the length direction, the first height h31 and the second height h32 are set respectively, so that the microchannel openings 113 of the first dynamic flow channel 114 and the second dynamic flow channel 115 have different opening and closing thresholds, thereby regulating the expansion force at both ends of the length direction of the battery pack 210 respectively.

[0100] See also Figure 2 , Fig.14 and Fig.15 In some embodiments, the cooling plate 100 includes a first end 17 and a second end 18 opposite to each other along the length direction. The dynamic flow channel 11 includes a first dynamic flow channel 114 located at the first end 17 and a second dynamic flow channel 115 located at the second end 18. In the first dynamic flow channel 114, the width of the microchannel opening 113 is a first width. In the second dynamic flow channel 115, the width of the microchannel opening 113 is a second width. The first width is different from the second width.

[0101] Specifically, in the first dynamic flow channel 114, the width of the microchannel opening 113 is the first width w1; in the second dynamic flow channel 115, the width of the microchannel opening 113 is the second width w2. The first width w1 is different from the second width w2. Similar to the first height h31 and the second height h32, the first width w1 and the second width w2 can be determined by simulating the cooling plate 100, and the specific values ​​are determined according to the simulation situation and the specific design of the battery pack 210.

[0102] See also Figure 5 The embodiment of the present application further provides an energy storage device 200. The energy storage device 200 includes a battery pack 210 and a cooling plate 100 of any of the above embodiments. The cooling plate 100 is disposed at the bottom of the battery pack 210 to cool the battery pack 210.

[0103] See also Fig.16 The embodiment of the present application further provides an electric device 1000. The electric device 1000 includes the above energy storage device 200. The electric device 1000 may be a smart phone, a tablet computer, a laptop computer, an electric car, an electric bicycle, an industrial device (such as a machine tool) or a household device (such as an air conditioner, a television, etc.).

[0104] In summary, in the cooling plate 100, the energy storage device 200 and the electrical equipment 1000 of the embodiment of the present application, a dynamic flow channel 11 is formed between the first cold plate 13 and the second cold plate 14, and the dynamic flow channel 11 includes a main flow channel 111 and a secondary flow channel 112. The bent protrusion section 141 is located between the main flow channel 111 and the secondary flow channel 112, and a microchannel opening 113 is formed between the bent protrusion section 141 and the first cold plate 13. When the battery pack 210 heats up and expands, the expansion force of the battery pack 210 acts on the cooling plate 100, squeezing the first cold plate 13, and the microchannel opening 113 with a smaller height is closed due to the squeezing effect, and the coolant no longer enters the secondary flow channel 112. The flow rate of the coolant in the main flow channel 111 remains unchanged, and the flow rate increases. In this way, the local cooling effect of the cooling plate 100 can be effectively improved, the temperature difference between the battery cells can be reduced, and the influence of the temperature difference on the life of the battery cells can be reduced, and the relationship between the expansion force, the temperature difference between the battery cells and the life of the battery cells can be balanced.

[0105] In the description of the present application, 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" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0106] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0107] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0108] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific processes and examples of materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0109] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", "some examples", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0110] Although the embodiments of the present application have been shown and described above, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cooling plate, characterized in that: Used to cool the battery pack, the cooling plate includes a first cold plate and a second cold plate, the battery pack is arranged on the first cold plate, a dynamic flow channel extending in a bent state is constructed between the first cold plate and the second cold plate, the dynamic flow channel includes a main flow channel and a secondary flow channel arranged on the side of the main flow channel; The second cold plate includes a bent protrusion section protruding toward the first cold plate along the height direction of the cooling plate, the bent protrusion section is located between the main flow channel and the secondary flow channel, and a microchannel opening is formed between the bent protrusion section and the first cold plate, and the height of the microchannel opening is smaller than the height of the main flow channel and the height of the secondary flow channel.

2. The cooling plate according to claim 1, characterized in that The height of the main flow channel is greater than the height of the secondary flow channel.

3. The cooling plate according to claim 1, characterized in that The second cold plate comprises a first bending section connected to one end of the bending protrusion section, and the main flow channel is formed between the first bending section and the first cold plate; The second cold plate includes a second bending section connected to the other end of the bending protrusion section, and the secondary flow channel is formed between the second bending section and the first cold plate.

4. The cooling plate according to claim 3, characterized in that The second cold plate comprises a connecting section, and the connecting section is arranged at an end of the second bending section away from the bending protrusion section; Along the height direction of the cooling plate, the connecting section abuts against the first cold plate.

5. The cooling plate according to claim 1, characterized in that The secondary flow channel includes a primary flow channel and a secondary flow channel, and the primary flow channel and the secondary flow channel are respectively arranged on both sides of the primary flow channel in a width direction.

6. The cooling plate according to claim 1, characterized in that The cooling plate further comprises a water inlet and a water outlet, a cooling channel extending in a bent shape is configured between the first cold plate and the second cold plate, and the cooling channel connects the water inlet and the water outlet; The dynamic flow channel is a partial flow channel of the cooling flow channel.

7. The cooling plate according to claim 6, characterized in that Along the liquid flow direction of the cooling channel, the cooling channel includes a first main path and a plurality of second main paths branching from the first main path, the first main path is connected to the water inlet, and the dynamic channel is arranged in the plurality of second main paths.

8. The cooling plate according to claim 6, characterized in that Along the liquid flow direction of the cooling channel, the cooling channel includes a plurality of third main paths and a fourth main path formed by the confluence of the plurality of third main paths, the fourth main path is connected to the water outlet, and the dynamic channel is arranged in the plurality of third main paths and the fourth main path.

9. The cooling plate according to claim 1, characterized in that The cooling plate comprises a first end and a second end opposite to each other along a length direction; The dynamic flow channel includes a first dynamic flow channel located at the first end and a second dynamic flow channel located at the second end; In the first dynamic flow channel, the height of the microchannel opening is a first height; in the second dynamic flow channel, the height of the microchannel opening is a second height; The first height is different from the second height.

10. The cooling plate according to claim 1, characterized in that The cooling plate comprises a first end and a second end opposite to each other along a length direction; The dynamic flow channel includes a first dynamic flow channel located at the first end and a second dynamic flow channel located at the second end; In the first dynamic flow channel, the width of the microchannel opening is a first width; in the second dynamic flow channel, the width of the microchannel opening is a second width; The first width is different from the second width.

11. An energy storage device, characterized in that: include: Battery pack; and The cooling plate according to any one of claims 1 to 10, wherein the cooling plate is arranged at the bottom of the battery pack.

12. An electrical equipment, characterized in that: Includes the energy storage device as claimed in claim 11.

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