Heat dissipation device, energy storage system, heat dissipation device design method and heat dissipation control method

Abstract

The present invention provides a heat dissipation device, an energy storage system, a heat dissipation device design method and a heat dissipation control method, which relate to the field of heat dissipation technology of energy storage systems. The heat dissipation device includes a liquid cooling structure and a thermally conductive adhesive assembly, the liquid cooling structure has a cooling flow path, the thermally conductive adhesive assembly is installed on the liquid cooling structure, and the thermally conductive adhesive assembly is used to transfer the heat of multiple battery modules to the liquid cooling structure, and then exchange heat through the cooling medium in the cooling flow path. The thermally conductive adhesive assembly includes multiple thermally conductive adhesive sheets, and the multiple thermally conductive adhesive sheets are used to respectively correspond to the heat conduction between multiple battery modules and the liquid cooling structure, and the thermal conductivity of the thermally conductive adhesive sheets is set according to the heat exchange required by the corresponding battery modules, so that the heat exchange of multiple battery modules meets the requirements, which also helps to improve the temperature uniformity of multiple battery modules. Moreover, the heat dissipation device does not need to perform adaptive design on the liquid cooling structure, avoiding the technical problem of a long design cycle of the liquid cooling structure.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of energy storage systems, and in particular to a heat dissipation device, an energy storage system, a heat dissipation device design method, and a heat dissipation control method. Background Art

[0002] The battery temperature of the energy storage system will rise during the charging and discharging process. Using it under continuous high temperature conditions will greatly shorten the battery life and may also cause safety problems such as thermal runaway. At present, in order to improve the above problems, liquid cooling technology is often used to dissipate heat from the battery. Liquid cooling technology is a method of directly dissipating heat through liquid convection. It can achieve precise temperature control of the battery and ensure uniform cooling, thereby ensuring the stable operation of the energy storage battery.

[0003] However, in the existing liquid cooling solutions for batteries, a cold plate is generally used for heat dissipation, and the temperature control strategy is controlled by only one inlet and outlet, which easily leads to uneven temperature in the battery PACK, thus having a great impact on battery life and battery safety. In order to improve the above problems, a liquid cooling mechanism for batteries is proposed in the prior art, which designs the flow channel in the cold plate so that the cross-sectional area of ​​the flow channel away from the water inlet is larger than the cross-sectional area of ​​the flow channel near the water inlet, thereby ensuring the uniformity of cooling by controlling the flow rate. However, this method requires adaptive design of the cold plate. For example, different design schemes are required for batteries of different sizes, which results in problems such as a long development cycle of the cold plate. Summary of the invention

[0004] The purpose of the present invention is to provide a heat dissipation device, an energy storage system, a heat dissipation device design method and a heat dissipation control method, which can improve the problem of uneven battery module temperature that occurs during the liquid cooling process in the prior art.

[0005] The embodiments of the present invention can be implemented in the following ways:

[0006] A heat dissipation device, the heat dissipation device is used to dissipate heat for multiple battery modules; the heat dissipation device comprises:

[0007] A liquid cooling structure, the liquid cooling structure having a cooling flow path, the liquid cooling structure exchanging heat through a cooling medium in the cooling flow path; and

[0008] A thermally conductive adhesive component, the thermally conductive adhesive component is mounted on the liquid cooling structure, and the thermally conductive adhesive component is used to be arranged between the multiple battery modules and the liquid cooling structure, and is used to transfer heat of the multiple battery modules to the liquid cooling structure;

[0009] Among them, the thermally conductive adhesive assembly includes a plurality of thermally conductive adhesive sheets, and the plurality of thermally conductive adhesive sheets are used to respectively perform heat conduction between the plurality of battery modules and the liquid cooling structure, and the thermal conductivity coefficient of the thermally conductive adhesive sheets is set according to the heat exchange amount required by the corresponding battery module.

[0010] Optionally, the liquid cooling structure includes a first standard cold plate and a plurality of second standard cold plates, the first standard cold plate is used to dissipate heat for the plurality of battery modules, and the plurality of second standard cold plates are arranged side by side between the first standard cold plate and the thermally conductive adhesive assembly; the cooling flow path includes a first cooling flow path located in the first standard cold plate and a second cooling flow path located in the second standard cold plate.

[0011] Optionally, each of the second standard cold plates has a second cooling flow path that is independent of each other, and the second cooling flow path has a second cooling inlet and a second cooling outlet located at two opposite ends of the second standard cold plate.

[0012] Optionally, the liquid cooling structure also includes a coolant supply pipe and a coolant output pipe, the coolant supply pipe is connected to the second cooling inlet through a first solenoid valve to control the on-off of the cooling medium in the second cooling flow path through the first solenoid valve; the coolant output pipe is connected to the second cooling outlet.

[0013] Optionally, the first standard cold plate has two opposite ends along a first direction, the first cooling flow path has a first cooling inlet and a first cooling outlet, the first cooling inlet and the first cooling outlet are located at one end of the first standard cold plate along the first direction; the plurality of second standard cold plates are arranged side by side along the first direction, and the second cooling inlet and the second cooling outlet are located at two ends of the second standard cold plate along the second direction;

[0014] The first direction is perpendicular to the second direction.

[0015] An energy storage system comprises the above-mentioned heat dissipation device and a plurality of battery modules, wherein the heat dissipation device is arranged below the plurality of battery modules.

[0016] Optionally, the plurality of thermally conductive films are arranged in one-to-one correspondence with the plurality of battery modules.

[0017] A heat dissipation device design method, the heat dissipation device design method comprising:

[0018] Respectively obtaining terminal temperatures of a plurality of battery modules to be cooled;

[0019] Obtaining heat exchange corresponding to the plurality of battery modules respectively according to the terminal temperature and the preset target temperature;

[0020] The thermal conductivity coefficients of the plurality of thermally conductive films are obtained according to the heat exchange amount.

[0021] Optionally, the step of obtaining the thermal conductivity of a plurality of thermally conductive films according to the heat exchange amount includes:

[0022] Calculating the ratio of the theoretical thermal conductivity coefficients of the plurality of thermally conductive films according to the heat exchange amount;

[0023] The thermal conductivity that meets the ratio relationship is selected as the actual thermal conductivity of the thermal conductive film.

[0024] Optionally, the formula for calculating the ratio of the theoretical thermal conductivity of the plurality of thermally conductive films is:

[0025]

[0026] Among them, K1 is the theoretical thermal conductivity of the first thermally conductive film; K2 is the theoretical thermal conductivity of the second thermally conductive film; Ks is the theoretical thermal conductivity of the s-th thermally conductive film; Q1 is the heat exchange of the battery module corresponding to the first thermally conductive film; Q2 is the heat exchange of the battery module corresponding to the second thermally conductive film; Qs is the heat exchange of the battery module corresponding to the s-th thermally conductive film; t is the temperature of the cooling medium supplied by the liquid cooling structure in the heat dissipation device; T1 is the terminal temperature of the battery module corresponding to the first thermally conductive film; T2 is the terminal temperature of the battery module corresponding to the second thermally conductive film; Ts is the terminal temperature of the battery module corresponding to the s-th thermally conductive film.

[0027] A heat dissipation control method is provided, wherein a heat dissipation device is controlled to dissipate heat from a plurality of battery modules; the heat dissipation device adopts the heat dissipation device mentioned above; the heat dissipation control method comprises:

[0028] Respectively acquiring the temperatures of the plurality of battery modules and the temperature differences between the plurality of battery modules;

[0029] If the temperature of the battery module exceeds a preset target temperature, controlling the first standard cold plate to open;

[0030] If the temperature difference exceeds the preset temperature difference, the second standard cold plate corresponding to the first battery module is controlled to open, and the opening of the second standard cold plate is adjusted according to the temperature difference; wherein the two battery modules exceeding the preset temperature difference are the first battery module and the second battery module, and the temperature of the first battery module is greater than the temperature of the second battery module.

[0031] The heat dissipation device, energy storage system, heat dissipation device design method and heat dissipation control method provided by the embodiments of the present invention have the following beneficial effects:

[0032] An embodiment of the present invention provides a heat dissipation device, which includes a liquid cooling structure and a thermally conductive adhesive component. The liquid cooling structure has a cooling flow path. The thermally conductive adhesive component is installed on the liquid cooling structure, and the thermally conductive adhesive component is used to be arranged between multiple battery modules and the liquid cooling structure, so that the heat of the multiple battery modules is transferred to the liquid cooling structure through the thermally conductive adhesive component, and then the heat is exchanged through the cooling medium in the cooling flow path to achieve heat dissipation and cooling of the multiple battery modules. The thermally conductive adhesive component includes multiple thermally conductive adhesive sheets, and the multiple thermally conductive adhesive sheets are used to respectively correspond to the heat conduction between the multiple battery modules and the liquid cooling structure, and the thermal conductivity of the thermally conductive adhesive sheets is set according to the heat exchange required by the corresponding battery modules, so that the heat exchange of the multiple battery modules meets the requirements, which also helps to improve the temperature uniformity of the multiple battery modules. In addition, the heat dissipation device does not need to perform adaptive design on the liquid cooling structure, avoiding the technical problem of a long design cycle of the liquid cooling structure.

[0033] The embodiment of the present invention further provides an energy storage system, which includes the above-mentioned heat dissipation device. Since the energy storage system includes the above-mentioned energy storage system, it also has the advantages of improving the temperature uniformity of multiple battery modules and avoiding the technical problem of long liquid cooling structure design cycle.

[0034] The embodiment of the present invention also provides a heat dissipation device design method, which includes: obtaining the terminal temperatures of multiple battery modules to be dissipated respectively; obtaining the heat exchange corresponding to the multiple battery modules according to the terminal temperatures and the preset target temperature; and obtaining the thermal conductivity of multiple thermal conductive films according to the heat exchange. The heat dissipation device design method has the advantages of improving the temperature uniformity of multiple battery modules and avoiding the technical problem of a long liquid cooling structure design cycle.

[0035] An embodiment of the present invention further provides a heat dissipation control method, which is used to control a heat dissipation device and has the advantage of improving the temperature uniformity of multiple battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0037] Figure 1 A schematic diagram of an explosion structure of an energy storage system provided according to one aspect of the present invention is shown;

[0038] Figure 2 A schematic diagram of the structure of an energy storage system provided according to one aspect of the present invention is shown;

[0039] Figure 3It shows the internal structure diagram of the second standard cold plate in the heat dissipation device provided according to one aspect of the present invention;

[0040] Figure 4 It shows the internal structure diagram of the first standard cold plate in the heat dissipation device provided according to one aspect of the present invention;

[0041] Figure 5 A step diagram of a heat dissipation device design method provided according to one aspect of the present invention is shown. ;

[0042] Figure 6 A logic diagram of a heat dissipation control method provided according to one aspect of the present invention is shown.

[0043] Reference numerals:

[0044] 10-energy storage system; 100-heat dissipation device; 110-thermal conductive adhesive assembly; 111-thermal conductive adhesive sheet; 120-liquid cooling structure; 121-first standard cold plate; 122-first cooling flow path; 123-first cooling inlet; 124-first cooling outlet; 125-second standard cold plate; 126-second cooling flow path; 127-second cooling inlet; 128-second cooling outlet; 131-cooling liquid supply pipe; 132-first solenoid valve; 133-cooling liquid output pipe; 134-second solenoid valve; 200-battery module. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0046] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "vertical" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] At the same time, it should be noted that the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, an integral connection, or a detachable 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, or the internal communication of two components, etc. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Figure 1 The exploded structure diagram of the energy storage system 10 provided in this embodiment is as follows: Figure 2 A schematic diagram of the structure of the energy storage system 10 provided in this embodiment, Figure 2 for Figure 1 The structure of the right perspective, and Figure 2 The cooling liquid supply pipe 131 is not shown in the figure, and the cooling liquid supply pipe 131 will be described later. Figure 1 and Figure 2 This embodiment provides a heat dissipation device 100 and also provides an energy storage system 10. A plurality of battery modules 200 are arranged in the energy storage system 10. The heat dissipation device 100 is arranged below the plurality of battery modules 200. When the battery modules 200 generate heat during operation, the heat dissipation device 100 can be used to dissipate heat and cool the plurality of battery modules 200.

[0050] The heat dissipation device 100 includes a liquid cooling structure 120 and a thermally conductive adhesive component 110. The liquid cooling structure 120 has a cooling flow path. The thermally conductive adhesive component 110 is installed on the liquid cooling structure 120, and the thermally conductive adhesive component 110 is used to be arranged between the multiple battery modules 200 and the liquid cooling structure 120, so that the heat of the multiple battery modules 200 is transferred to the liquid cooling structure 120 through the thermally conductive adhesive component 110, and then the heat is exchanged through the cooling medium in the cooling flow path to achieve heat dissipation and cooling of the multiple battery modules 200. The thermally conductive adhesive component 110 includes a plurality of thermally conductive adhesive sheets 111, and the plurality of thermally conductive adhesive sheets 111 are used to respectively perform heat conduction between the multiple battery modules 200 and the liquid cooling structure 120, and the thermal conductivity of the thermally conductive adhesive sheets 111 is set according to the heat exchange amount required by the corresponding battery modules 200, so that the heat exchange amount of the multiple battery modules 200 meets the demand, which also helps to improve the temperature uniformity of the multiple battery modules 200. Furthermore, the heat dissipation device 100 does not require adaptive design of the liquid cooling structure 120 , thereby avoiding the technical problem of a long design period of the liquid cooling structure 120 .

[0051] The heat dissipation device 100 provided in this embodiment is further described below:

[0052] Please continue to refer to Figure 1 and Figure 2In this embodiment, a plurality of thermally conductive films 111 are arranged in one-to-one correspondence with a plurality of battery modules 200, that is, each thermally conductive film 111 corresponds to a battery module 200, and the thermal conductivity of the thermally conductive film 111 is arranged according to the heat exchange capacity of the corresponding battery module 200. It is understandable that in some other embodiments, if the heat exchange requirements of several adjacent battery modules 200 are roughly the same, the thermally conductive film 111 may also be arranged to correspond to several battery modules 200 having roughly the same heat exchange requirements at the same time, so as to ensure that the heat exchange requirements of all battery modules 200 in the energy storage system 10 can be met by the arrangement of the plurality of thermally conductive films 111.

[0053] The liquid cooling structure 120 includes a first standard cold plate 121 and a second standard cold plate 125. The first standard cold plate 121 is used to dissipate heat for the multiple battery modules 200. The multiple second standard cold plates 125 are arranged side by side between the first standard cold plate 121 and the thermal conductive adhesive assembly 110, that is, at least part of the heat directed from the multiple battery modules 200 to the liquid cooling structure 120 through the thermal conductive adhesive assembly 110 is directed to the first standard cold plate 121 through the second standard cold plate 125. The cooling flow path includes a first cooling flow path 122 located in the first standard cold plate 121 and a second cooling flow path 126 located in the second standard cold plate 125. When the first standard cold plate 121 is turned on, the cooling medium (such as cooling water) enters the first cooling flow path 122, thereby dissipating heat and cooling the multiple battery modules 200; when the second standard cold plate 125 is turned on, the cooling medium (such as cooling water) enters the second cooling flow path 126, thereby dissipating heat and cooling the multiple battery modules 200. In the present embodiment, a thermally conductive film 111 with a corresponding thermal conductivity is provided according to different battery modules 200 to meet the heat exchange requirements of different battery modules 200. Therefore, there is no need to adaptively design the structure of the cold plate, and thus the internal structure of the first standard cold plate 121 and the second standard cold plate 125 can adopt a standard structure, and the first standard cold plate 121 and the second standard cold plate 125 can adopt a universal structure.

[0054] Specifically, the first standard cold plate 121 is an integrated plate-shaped member having a larger size than the second standard cold plate 125, and the plurality of battery modules 200 can all dissipate heat through the first standard cold plate 121. Figure 1 In the structure shown, all battery modules 200 can dissipate heat through the first standard cold plate 121. The second standard cold plate 125 is a plate-shaped member that is smaller in size than the first standard cold plate 121. Multiple second standard cold plates 125 are arranged side by side to cool multiple battery modules 200. That is, a single second standard cold plate 125 can cool Figure 1 In the structure shown, all battery modules 200 are partially heat-dissipating.

[0055] The first standard cold plate 121 is rectangular, and has a length direction and a width direction. Multiple battery modules 200 are distributed in a rectangular array, that is, the multiple battery modules 200 can be regarded as including multiple columns distributed along the length direction of the first standard cold plate 121 or as including multiple rows distributed along the width direction of the first standard cold plate 121, and each column or each row includes multiple battery modules 200. Correspondingly, multiple thermally conductive films 111 are also distributed in a matrix, and the multiple thermally conductive films 111 distributed in a matrix are arranged one by one under the multiple battery modules 200 distributed in a matrix, so that each battery module 200 realizes heat exchange with the liquid cooling structure 120 through the corresponding thermally conductive films 111, thereby meeting the heat dissipation requirements. In this embodiment, the number of battery modules 200 is sixteen, which are distributed in a 4×4 matrix. Accordingly, the number of thermally conductive films 111 is also sixteen, and they are distributed in a 4×4 matrix. It is understandable that in some other embodiments, the number and distribution of battery modules 200 and thermal conductive films 111 can be set according to requirements.

[0056] In this embodiment, a plurality of second standard cold plates 125 are arranged side by side along the length direction of the first standard cold plate 121, and each second standard cold plate 125 corresponds to a row of thermal conductive films 111. Specifically, in this embodiment, the number of second standard cold plates 125 is set to 4 ( Figure 1 Only two of them are shown in the figure), and each second standard cold plate 125 can dissipate heat and cool the four battery modules 200 included in a column. It can be understood that in some other embodiments, multiple second standard cold plates 125 can also be arranged side by side along the width direction of the first standard cold plate 121.

[0057] In this embodiment, each second standard cold plate 125 has a second cooling flow path 126 that is independent of each other, and the second cooling flow path 126 has a second cooling inlet 127 and a second cooling outlet 128 located at opposite ends of the second standard cold plate 125. Specifically, the second cooling inlet 127 and the second cooling outlet 128 are arranged at both ends of the second standard cold plate 125 along the width direction of the first standard cold plate 121. The specific structure of the second cooling flow path 126 includes but is not limited to the following: Figure 3 The structure shown.

[0058] Optionally, the liquid cooling structure 120 further includes a cooling liquid supply pipe 131 and a cooling liquid output pipe 133. The cooling liquid supply pipe 131 is connected to the second cooling inlet 127 through the first solenoid valve 132, so as to control the on and off of the cooling medium in the second cooling flow path 126 through the first solenoid valve 132. When the cooling medium in the second cooling flow path 126 is connected, the second standard cold plate 125 is in an open state, and when the cooling medium in the second cooling flow path 126 is disconnected, the second standard cold plate 125 is in a closed state. The cooling liquid output pipe 133 is connected to the second cooling outlet 128. Optionally, the second cooling outlet 128 is connected to the cooling liquid output pipe 133 through the second solenoid valve 134.

[0059] When the first solenoid valve 132 and the second solenoid valve 134 at the second cooling inlet 127 and the second cooling outlet 128 of a second standard cold plate 125 are both open, the second standard cold plate 125 is turned on, and the coolant in the coolant supply pipe 131 enters the second cooling flow path 126 of the second standard cold plate 125 through the first solenoid valve 132 and the second cooling inlet 127. The coolant flows along the second cooling flow path 126 for heat exchange and leaves the second cooling outlet 128 and enters the coolant output pipe 133 through the second solenoid valve 134. When the first solenoid valve 132 and the second solenoid valve 134 at the second cooling inlet 127 and the second cooling outlet 128 of a second standard cold plate 125 are both closed, the second standard cold plate 125 is closed.

[0060] Each second standard cold plate 125 can be independently controlled according to demand, so the temperature difference can be adjusted by controlling the opening and closing of the second standard cold plate 125 .

[0061] Further, the first standard cold plate 121 has two opposite ends along the first direction, and the first cooling flow path 122 has a first cooling inlet 123 and a first cooling outlet 124, and the first cooling inlet 123 and the first cooling outlet 124 are located at one end of the first standard cold plate 121 along the first direction. A plurality of second standard cold plates 125 are arranged side by side along the first direction, and the second cooling inlet 127 and the second cooling outlet 128 are located at two ends of the second standard cold plate 125 along the second direction. The first direction and the second direction are perpendicular.

[0062] Specifically, in this embodiment, a plurality of second standard cold plates 125 are arranged side by side along the length direction of the first standard cold plate 121. Therefore, the first direction mentioned in this embodiment refers to the width direction of the first standard cold plate 121. Accordingly, the second direction is the width direction of the first standard cold plate 121. The first cooling inlet 123 and the second cooling outlet 128 are arranged at one end of the length direction of the first standard cold plate 121 and are spaced apart along the width direction. The distribution of the first cooling flow path 122 includes but is not limited to the following methods: Figure 4 The structure shown.

[0063] Due to the inevitable change in the temperature of the coolant before and after heat dissipation, generally speaking, the temperature at the first cooling inlet 123 will be lower than the temperature at the first cooling outlet 124, which results in that along the width direction of the first standard cold plate 121, the heat dissipation effect at the first standard cold plate 121 relatively close to the first cooling inlet 123 is better than the heat dissipation effect at the first standard cold plate 121 relatively close to the first cooling outlet 124. The second cooling inlet 127 and the second cooling outlet 128 are arranged along the width direction of the first standard cold plate 121, and the second cooling inlet 127 is arranged on a side close to the first cooling outlet 124, and the second cooling outlet 128 is arranged on a side close to the first cooling inlet 123, which helps to compensate for the heat dissipation effect on both sides of the width direction of the first standard cold plate 121, further ensures the uniformity of the heat dissipation effect, and thus helps to ensure the temperature uniformity of the battery module 200.

[0064] Figure 5 The step diagram of the design method of the heat dissipation device 100 provided in this embodiment is shown. Figure 5 This embodiment also provides a heat sink 100 design method, which can implement the design of the above heat sink 100. Specifically, the heat sink 100 design method includes:

[0065] S01: Acquire the terminal temperatures of a plurality of battery modules 200 to be cooled respectively.

[0066] A temperature sensor can be provided on each battery module 200, and then the energy storage system 10 can be controlled to operate without dissipating heat for the multiple battery modules 200, and the temperature of the battery module 200 during operation can be detected by the temperature sensor, thereby obtaining the terminal temperature of the multiple battery modules 200. It should be noted that in the description of this embodiment, "terminal temperature" refers to the highest temperature of the battery module 200 when it is working. In this embodiment, the number of battery modules 200 is s, and accordingly, s terminal temperatures will be obtained through step S01, namely T1, T2...Ts.

[0067] S02: Obtaining heat exchange amounts corresponding to the plurality of battery modules 200 according to the terminal temperature and the preset target temperature.

[0068] The preset target temperature T is the temperature to which the battery module 200 needs to be cooled, and its specific value can be set according to demand, for example, the preset target temperature is set to 25° C. ≤ T ≤ 30° C. Optionally, the preset target temperature T can be set to 25° C., 28° C. or 30° C.

[0069] The formula for calculating the heat exchange according to the terminal temperature and the preset target temperature is:

[0070] Qn=(Tn-T)*C*m.

[0071] Wherein, Qn is the heat exchange capacity of the nth battery module 200; n represents the nth battery module 200, which can be an integer between 1 and s; Tn is the terminal temperature of the nth battery module 200; T is the preset target temperature; C is the specific heat capacity of the battery module 200; and m is the mass of the battery module 200. In this embodiment, the specific heat capacity and mass of multiple battery modules 200 in the same energy storage system 10 are equal.

[0072] S03: Obtaining thermal conductivity coefficients of the plurality of thermally conductive films 111 according to the heat exchange amount.

[0073] The heat exchange amount is the heat value that needs to be transferred to the liquid cooling structure 120 through the thermal conductive film 111. Therefore, the thermal conductivity coefficient required for each thermal conductive film 111 can be obtained according to theoretical calculations. The calculation formula is:

[0074] Kn*(t-Tn) / Ln=Qn / Sn

[0075] Among them, n represents the nth battery module 200, which can be an integer between 1 and s; Kn is the thermal conductivity of the nth thermal conductive film 111; t is the liquid supply temperature of the liquid cooling system; Sn is the contact area between the nth thermal conductive film 111 and the battery module 200; Ln is the thickness of the nth thermal conductive film 111.

[0076] Furthermore, since the thermal conductivity of the materials that can be selected for the thermally conductive adhesive sheet 111 is limited, in order to avoid the problem that the calculated theoretical thermal conductivity cannot select the corresponding thermally conductive adhesive material, the step of calculating the thermal conductivity of the plurality of thermally conductive adhesive sheets 111 includes:

[0077] S31: Calculating the ratio of the theoretical thermal conductivity of the plurality of thermally conductive films 111 according to the heat exchange amount.

[0078] The theoretical thermal conductivity of the thermally conductive film 111 is the thermal conductivity calculated by the formula in the above step S03 , and the ratio of the theoretical thermal conductivity of multiple thermally conductive films 111 can be calculated.

[0079] Optionally, in this embodiment, the plurality of thermally conductive films 111 correspond to the plurality of battery modules 200 one by one, and in the same energy storage system 10, generally speaking, the structural dimensions of the plurality of battery modules 200 are consistent, and the contact areas of the plurality of thermally conductive films 111 and the battery modules 200 are the same. At the same time, in this embodiment, the thickness of the plurality of thermally conductive films 111 is also the same. Therefore, the formula for calculating the ratio of the theoretical thermal conductivity coefficients of the plurality of thermally conductive films 111 is:

[0080]

[0081] Among them, K1 is the theoretical thermal conductivity of the first thermally conductive film 111; K2 is the theoretical thermal conductivity of the second thermally conductive film 111; Ks is the theoretical thermal conductivity of the s-th thermally conductive film 111; Q1 is the heat exchange of the battery module 200 corresponding to the first thermally conductive film 111; Q2 is the heat exchange of the battery module 200 corresponding to the second thermally conductive film 111; Qs is the heat exchange of the battery module 200 corresponding to the s-th thermally conductive film 111; t is the temperature of the cooling medium supplied by the liquid cooling structure 120 in the heat dissipation device 100; T1 is the terminal temperature of the battery module 200 corresponding to the first thermally conductive film 111; T2 is the terminal temperature of the battery module 200 corresponding to the second thermally conductive film 111; Ts is the terminal temperature of the battery module 200 corresponding to the s-th thermally conductive film 111.

[0082] S32: Selecting a thermal conductivity that meets the ratio relationship as the actual thermal conductivity of the thermal conductive film 111 .

[0083] Figure 6 The logic diagram of the heat dissipation control method provided by this embodiment is shown. Figure 6 This embodiment also provides a heat dissipation control method, which can perform heat dissipation control on the above-mentioned heat dissipation device 100. Optionally, the energy storage system 10 can also be configured to include a controller, which can execute at least one step of the heat dissipation control method provided in this embodiment. Specifically, the heat dissipation control method includes:

[0084] S11 : respectively acquiring the temperatures of the plurality of battery modules 200 and the temperature differences between the plurality of battery modules 200 .

[0085] Before the energy storage system 10 is operated, the first standard cold plate 121 and the second standard cold plate 125 are both in a closed state. When the energy storage system 10 starts to operate, the temperature of the battery module 200 is acquired by the temperature sensor provided on the battery module 200, and the temperature difference between any two battery modules 200 can be obtained according to the acquired temperature of the battery module 200.

[0086] S12: Determine whether the temperatures of the plurality of battery modules 200 meet a condition.

[0087] If the temperature of the battery module 200 exceeds the preset target temperature, the first standard cold plate 121 is controlled to open, and the coolant enters the first cooling flow path 122 from the first cooling inlet 123 and leaves from the first cooling outlet 124 after heat exchange.

[0088] If the temperature of the battery module 200 does not exceed the preset target temperature, that is, the temperature of the battery module 200 is less than or equal to the preset target temperature, no control instruction is sent to the first standard cold plate 121, and the first standard cold plate 121 remains in a closed state.

[0089] S13: Determine whether the temperature difference meets the requirements.

[0090] If the temperature difference exceeds the preset temperature difference, the second standard cold plate 125 corresponding to the first battery module 200 is controlled to open, and the opening of the second standard cold plate 125 is adjusted according to the temperature difference. The two battery modules 200 exceeding the preset temperature difference are the first battery module 200 and the second battery module 200, and the temperature of the first battery module 200 is greater than the temperature of the second battery module 200. Optionally, the preset temperature difference can be set to 3°C.

[0091] Specifically, controlling the second standard cold plate 125 to open means controlling the first solenoid valve 132 and the second solenoid valve 134 installed on both sides of the second standard cold plate 125 to open, at which time the coolant enters the second cooling flow path 126 from the coolant supply pipe 131 through the first solenoid valve 132 and the second cooling inlet 127, and leaves the second cooling flow path 126 from the second cooling outlet 128 after heat exchange and enters the coolant output pipe 133 through the second solenoid valve 134. At the same time, by controlling the opening of the first solenoid valve 132 and the second solenoid valve 134, the opening of the second standard cold plate 125 is controlled.

[0092] If the temperature difference does not exceed the preset temperature difference, no control instruction is sent to the second standard cold plate 125, and the second standard cold plate 125 is kept in the closed state.

[0093] That is, during the operation of the energy storage system 10 , if the temperature of the battery module 200 does not exceed the preset target and the temperature difference does not exceed the preset temperature difference, the first standard cold plate 121 and the second standard cold plate 125 remain in the closed state.

[0094] The heat dissipation device 100, energy storage system 10, heat dissipation device 100 design method and heat dissipation control method provided by the embodiment of the present invention, by setting the thermal conductivity of the thermal conductive film 111 according to the heat exchange required by the battery module 200, the heat dissipation requirements of the battery modules 200 in different parts can be met without the need for adaptive design of the internal structure of the cold plate, and the cold plate can use standard parts, which helps to reduce the design and processing costs, shorten the design cycle, and help to ensure the temperature uniformity of the multiple battery modules 200 in the energy storage system 10 during operation. At the same time, by setting the liquid cooling structure 120 to include a first standard cold plate 121 and a plurality of second standard cold plates 125, when the first standard cold plate 121 meets a wide range of heat dissipation requirements, the first standard cold plate 121 can be compensated for heat dissipation by the second standard module, further eliminating the influence of temperature differences and ensuring temperature uniformity.

[0095] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technology in the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat dissipation device, which is used to dissipate heat from multiple battery modules; characterized in that: The heat dissipation device comprises: A liquid cooling structure, the liquid cooling structure having a cooling flow path, the liquid cooling structure exchanging heat through a cooling medium in the cooling flow path; and A thermally conductive adhesive component, the thermally conductive adhesive component is mounted on the liquid cooling structure, and the thermally conductive adhesive component is used to be arranged between the multiple battery modules and the liquid cooling structure, and is used to transfer heat of the multiple battery modules to the liquid cooling structure; Wherein, the thermally conductive adhesive assembly includes a plurality of thermally conductive adhesive sheets, and the plurality of thermally conductive adhesive sheets are used to respectively and correspondingly conduct heat between the plurality of battery modules and the liquid cooling structure, and the thermal conductivity of the thermally conductive adhesive sheets is set according to the heat exchange amount required by the corresponding battery modules; The liquid cooling structure includes a first standard cold plate and a plurality of second standard cold plates, wherein the first standard cold plate is used to dissipate heat for the plurality of battery modules, and the plurality of second standard cold plates are arranged side by side between the first standard cold plate and the thermally conductive adhesive assembly; the cooling flow path includes a first cooling flow path located in the first standard cold plate and a second cooling flow path located in the second standard cold plate; Each of the second standard cold plates has a second cooling flow path that is independent of each other, and the second cooling flow path has a second cooling inlet and a second cooling outlet located at two opposite ends of the second standard cold plate; Each of the second standard cold plates is independently controlled and compensates for the heat dissipation effect of the first standard cold plate through the second cooling flow path.

2. The heat dissipation device according to claim 1, characterized in that: The liquid cooling structure also includes a cooling liquid supply pipe and a cooling liquid output pipe. The cooling liquid supply pipe is connected to the second cooling inlet through a first solenoid valve to control the on-off of the cooling medium in the second cooling flow path through the first solenoid valve; the cooling liquid output pipe is connected to the second cooling outlet.

3. The heat dissipation device according to claim 1, characterized in that: The first standard cold plate has two opposite ends along a first direction, the first cooling flow path has a first cooling inlet and a first cooling outlet, the first cooling inlet and the first cooling outlet are located at one end of the first standard cold plate along the first direction; the plurality of second standard cold plates are arranged side by side along the first direction, and the second cooling inlet and the second cooling outlet are located at two ends of the second standard cold plate along the second direction; The first direction is perpendicular to the second direction, and one of the first direction and the second direction is along a length direction of the first standard cold plate, and the other is along a width direction of the first standard cold plate.

4. An energy storage system, characterized in that: The energy storage system comprises the heat dissipation device according to any one of claims 1 to 3 and a plurality of battery modules, wherein the heat dissipation device is arranged below the plurality of battery modules.

5. The energy storage system according to claim 4, characterized in that: The plurality of thermally conductive adhesive sheets are arranged in one-to-one correspondence with the plurality of battery modules.

6. A method for designing a heat dissipation device, characterized in that: Used to design a heat dissipation device according to any one of claims 1 to 3; the heat dissipation device design method comprises: Respectively obtaining terminal temperatures of a plurality of battery modules to be cooled; Obtaining heat exchange corresponding to the plurality of battery modules respectively according to the terminal temperature and the preset target temperature; The thermal conductivity coefficients of the plurality of thermally conductive films are obtained according to the heat exchange amount.

7. The heat dissipation device design method according to claim 6, characterized in that: The step of obtaining the thermal conductivity of a plurality of thermally conductive films according to the heat exchange amount comprises: Calculating the ratio of the theoretical thermal conductivity coefficients of the plurality of thermally conductive films according to the heat exchange amount; The thermal conductivity that meets the ratio relationship is selected as the actual thermal conductivity of the thermal conductive film.

8. The heat dissipation device design method according to claim 7, characterized in that: The formula for calculating the ratio of the theoretical thermal conductivity of the plurality of thermally conductive films is: Among them, K1 is the theoretical thermal conductivity of the first thermally conductive film; K2 is the theoretical thermal conductivity of the second thermally conductive film; Ks is the theoretical thermal conductivity of the s-th thermally conductive film; Q1 is the heat exchange of the battery module corresponding to the first thermally conductive film; Q2 is the heat exchange of the battery module corresponding to the second thermally conductive film; Qs is the heat exchange of the battery module corresponding to the s-th thermally conductive film; t is the temperature of the cooling medium supplied by the liquid cooling structure in the heat dissipation device; T1 is the terminal temperature of the battery module corresponding to the first thermally conductive film; T2 is the terminal temperature of the battery module corresponding to the second thermally conductive film; Ts is the terminal temperature of the battery module corresponding to the s-th thermally conductive film.

9. A heat dissipation control method, characterized in that: The heat dissipation device is controlled to dissipate heat from multiple battery modules; the heat dissipation device is a heat dissipation device as claimed in any one of claims 1 to 3; the heat dissipation control method comprises: Respectively acquiring the temperatures of the plurality of battery modules and the temperature differences between the plurality of battery modules; If the temperature of the battery module exceeds a preset target temperature, controlling the first standard cold plate to open; If the temperature difference exceeds the preset temperature difference, the second standard cold plate corresponding to the first battery module is controlled to open, and the opening of the second standard cold plate is adjusted according to the temperature difference; wherein the two battery modules exceeding the preset temperature difference are the first battery module and the second battery module, and the temperature of the first battery module is greater than the temperature of the second battery module.

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