Liquid cooling energy storage battery pack and design method thereof

Abstract

The invention provides a liquid-cooled energy storage battery pack and a design method thereof. The liquid-cooled energy storage battery pack comprises a battery cell module array, the liquid cooling plate is arranged below the battery cell module array, a liquid inlet and a liquid outlet are formed in one side edge of the liquid cooling plate, a flow channel is formed in the liquid cooling plate, a middle partition plate is arranged in the liquid cooling plate in the first direction, the bottom surface of the battery cell module array is divided into a left area and a right area by the middle partition plate, and the liquid inlet is arranged close to the left area; the heat-conducting glue layer comprises a first heat-conducting glue layer and a second heat-conducting glue layer, the first heat-conducting glue layer is arranged at the end, close to the liquid inlet, of the left area, the second heat-conducting glue layer is arranged in the remaining area, excluding the first heat-conducting glue layer, of the bottom face of the battery cell module array, and the heat conductivity coefficient of the first heat-conducting glue layer is smaller than that of the second heat-conducting glue layer. According to the liquid cooling energy storage battery pack, heat dissipation of the battery cell modules close to the inlet of the liquid cooling plate and the liquid cooling plate can be properly weakened, so that the temperature difference between the whole battery cell modules in the liquid cooling energy storage battery pack is reduced, and the temperature uniformity of the battery cell modules in the liquid cooling battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a liquid-cooled energy storage battery pack and a design method thereof. Background Art

[0002] Energy storage battery pack refers to a device or system that stores electrical energy. It is usually composed of multiple battery cells and may include a monitoring and management system to ensure safe and efficient storage and release of energy. Energy storage battery packs generate a lot of heat during operation. The current mainstream heat dissipation methods for energy storage battery packs include air cooling and liquid cooling. In the liquid cooling method, the liquid cooling system uses circulating coolant to remove the heat generated by the charging and discharging of the battery module to achieve temperature control of the battery module. The liquid cooling system mainly includes liquid cooling pipelines, liquid cooling plates, chillers, temperature sensors, etc. The liquid cooling pipeline is connected to the liquid cooling plate of the battery pack and the inlet and outlet pipelines of the chiller to form a circulation loop. Driven by the circulating pump, the coolant flows in the circulation loop and flows into the liquid cooling plate to absorb and remove the heat generated by the battery module during operation. The heat-carrying coolant enters the chiller and is cooled by the evaporator and then flows out at a lower temperature. It re-enters the liquid cooling plate through the liquid cooling pipeline and absorbs the heat generated by the battery module again. This cycle achieves temperature control of the battery module and continuous heat dissipation of the energy storage system. One of the key components in the liquid cooling system is the liquid cooling plate.

[0003] In the prior art, liquid-cooled energy storage battery pack products usually place the liquid cooling plate at the bottom of the battery cell module, with the inlet and outlet set on the same side and only having a single inlet and outlet respectively.

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: unidirectional design, spatial limitations and unidirectional heat transfer from the upper battery cell module of the liquid cooling plate to the lower liquid cooling plate, so that no matter how the flow channel of the bottom-mounted liquid cooling plate is designed, the temperature of the coolant at the outlet of the liquid cooling plate that has undergone sufficient heat exchange is always higher than the coolant near the inlet that has not undergone sufficient heat exchange, resulting in uneven cooling of the battery cell modules near the inlet of the liquid cooling plate and the battery cell modules near the outlet of the liquid cooling plate in the liquid-cooled battery pack, resulting in temperature differences in the battery cell modules in the battery pack, thereby affecting the cycle life of the entire energy storage battery pack and causing the performance of the energy storage battery pack to decline. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the purpose of the present invention is to provide a liquid-cooled energy storage battery pack and a manufacturing method thereof, so that the temperature difference between the overall battery cell modules in the liquid-cooled energy storage battery pack is reduced and the temperature uniformity of the battery cell modules in the liquid-cooled energy storage battery pack is improved.

[0007] To achieve the above object, the first aspect of the present invention provides a liquid-cooled energy storage battery pack, comprising:

[0008] A battery cell module array, comprising a plurality of battery cell modules;

[0009] A liquid cooling plate is arranged below the battery cell module array, a liquid inlet and a liquid outlet are arranged on one side of the liquid cooling plate, a flow channel connected to the liquid inlet and the liquid outlet is arranged inside the liquid cooling plate, a middle partition is arranged inside the liquid cooling plate along a first direction, the middle partition divides the bottom surface of the battery cell module array into a left area and a right area, and the liquid inlet is arranged adjacent to the left area;

[0010] The thermally conductive adhesive layer includes a first thermally conductive adhesive layer and a second thermally conductive adhesive layer. The first thermally conductive adhesive layer is arranged at one end of the left area adjacent to the liquid inlet, and the second thermally conductive adhesive layer is arranged on the bottom surface of the battery cell module array excluding the remaining area of ​​the first thermally conductive adhesive layer. The thermal conductivity of the first thermally conductive adhesive layer is smaller than the thermal conductivity of the second thermally conductive adhesive layer, and is used to reduce the temperature difference between the battery cell modules.

[0011] According to the liquid-cooled energy storage battery pack of the present invention, by coating thermally conductive adhesives with different thermal conductivities on the battery cell module array, arranging a first thermally conductive adhesive layer at one end near the liquid inlet, and arranging a second thermally conductive adhesive in the remaining area, the heat dissipation between the battery cell module near the inlet of the liquid cooling plate and the liquid cooling plate can be appropriately weakened, and the temperature rise of the battery cell module at the inlet of the liquid cooling plate can be increased, so that the temperature difference between the battery cell modules in the liquid-cooled energy storage battery pack is reduced, and the temperature uniformity of the battery cell modules in the liquid-cooled energy storage battery pack is improved, thereby extending the cycle life of the energy storage battery pack and improving the overall performance of the liquid-cooled energy storage battery pack.

[0012] According to an embodiment of the present invention, the battery cell modules are symmetrically distributed along both sides of the middle partition, and the coating area of ​​the first thermal conductive adhesive layer is 15%-30% of the bottom surface area of ​​the entire battery cell module array.

[0013] According to an embodiment of the present invention, the middle partition is connected to the side wall of the liquid cooling plate at one end close to the liquid inlet, and the other end of the middle partition is separated from the side wall of the liquid cooling plate.

[0014] According to an embodiment of the present invention, a plurality of partitions are provided inside the liquid cooling plate on both sides of the middle partition along a first direction, and the partitions define the flow channel.

[0015] According to an embodiment of the present invention, the thickness of the first thermal conductive adhesive layer is not less than the thickness of the second thermal conductive adhesive layer.

[0016] According to one embodiment of the present invention, the partition includes a first partition and a second partition that are parallel to each other, and the wall thickness of the first partition is smaller than the wall thickness of the second partition.

[0017] According to an embodiment of the present invention, the side wall of the battery cell module array is separated from the side wall of the liquid cooling plate.

[0018] A second aspect of the present invention provides a design method for a liquid-cooled energy storage battery pack as described in the first aspect, comprising:

[0019] S102, measuring the temperature of the upper surface of the battery cell module of the liquid-cooled energy storage battery pack in operation;

[0020] S104, determining the source of the overall temperature difference between the battery cell modules of the liquid-cooled energy storage battery pack through analysis;

[0021] S106, dividing the contact area between the battery cell module and the liquid cooling plate into two areas, namely a first area adjacent to the liquid inlet and a second area excluding the first area, wherein the first area and the second area are used for applying thermal conductive adhesive;

[0022] S108, calculating and obtaining the thermal conductivity of the thermally conductive adhesive, wherein the thermal conductivity of the thermally conductive adhesive in the first region is less than the thermal conductivity of the thermally conductive adhesive in the second region;

[0023] S110, determining whether the temperature difference between the cell modules of the liquid-cooled energy storage battery pack coated with the thermal conductive adhesive meets the temperature difference requirement, if so, executing step S112, if not, continuing to execute steps S106 to S110, and continuously optimizing the three parameters of the area of ​​the first region, the second region and the thermal conductivity of the thermal conductive adhesive;

[0024] S112, the design work of the liquid-cooled energy storage battery pack is terminated.

[0025] According to the design method of the liquid-cooled energy storage battery pack of the present invention, by coating thermally conductive adhesives with different thermal conductivities on the battery cell module array, arranging a first thermally conductive adhesive layer at one end near the liquid inlet, and arranging a second thermally conductive adhesive in the remaining area, the heat dissipation between the battery cell module near the inlet of the liquid cooling plate and the liquid cooling plate can be appropriately weakened, and the temperature rise of the battery cell module at the inlet of the liquid cooling plate can be increased, so that the temperature difference between the entire battery cell modules in the liquid-cooled energy storage battery pack is reduced, and the temperature uniformity of the battery cell modules in the liquid-cooled energy storage battery pack is improved, thereby extending the cycle life of the energy storage battery pack and improving the overall performance of the liquid-cooled energy storage battery pack.

[0026] According to one embodiment of the present invention, the temperature measurement of the upper surface of the battery cell module of the working liquid-cooled energy storage battery pack includes:

[0027] The upper surface temperature of the battery cell module of the working liquid-cooled energy storage battery pack is measured by experimental method or CFD numerical simulation.

[0028] According to one embodiment of the present invention, the step of judging whether the temperature difference between the cell modules of the liquid-cooled energy storage battery pack coated with thermally conductive adhesive meets the temperature difference requirement includes:

[0029] Through experiments combined with CFD numerical simulation, it is determined whether the temperature difference between the cell modules of the liquid-cooled energy storage battery pack coated with thermal conductive adhesive meets the temperature difference requirements.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. Among them:

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of a liquid-cooled energy storage battery pack proposed in one embodiment of the present invention.

[0033] Figure 2 It is a front view of a liquid-cooled energy storage battery pack proposed in one embodiment of the present invention.

[0034] Figure 3 yes Figure 2 Top view of the .

[0035] Figure 4 yes Figure 2 Side view of.

[0036] Figure 5 It is a top view of the internal flow channel of the liquid cooling plate of the liquid-cooled energy storage battery pack in one embodiment of the present invention.

[0037] Figure 6 It is a schematic diagram of the flow of cooling medium in the liquid cooling plate.

[0038] Figure 7 Schematic diagram of coating the thermal conductive adhesive layer on the surface of the liquid cooling plate.

[0039] Figure 8 It is a flow chart of a method for designing a liquid-cooled energy storage battery pack according to an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1-battery cell module array, 2-liquid cooling plate, 3-liquid inlet, 4-liquid outlet, 5-partition, 51-first partition, 52-second partition, 6-middle partition, 7-first thermal conductive adhesive layer, 8-second thermal conductive adhesive layer. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0043] Refer to the following Figures 1 to 7 , describing a liquid-cooled energy storage battery pack according to an embodiment of the present invention.

[0044] Combination Figures 1 to 7 As shown, a liquid-cooled energy storage battery pack according to an embodiment of the present invention includes a battery cell module array 1, a liquid cooling plate 2 and a thermal conductive adhesive layer.

[0045] The battery cell module array 1 includes a plurality of battery cell modules. A liquid cooling plate 2 is disposed below the battery cell module array 1, a liquid inlet 3 and a liquid outlet 4 are disposed on one side of the liquid cooling plate 2, a flow channel connected to the liquid inlet 3 and the liquid outlet 4 is disposed inside the liquid cooling plate 2, a middle partition 6 is disposed inside the liquid cooling plate 2 along a first direction, the middle partition 6 divides the bottom surface of the battery cell module array 1 into a left area and a right area, and the liquid inlet 3 is disposed adjacent to the left area;

[0046] The thermal conductive adhesive layer includes a first thermal conductive adhesive layer 7 and a second thermal conductive adhesive layer 8. The first thermal conductive adhesive layer 7 is arranged at one end of the left area near the liquid inlet 3, and the second thermal conductive adhesive layer 8 is arranged on the bottom surface of the battery cell module array 1 excluding the remaining area of ​​the first thermal conductive adhesive layer 7. The thermal conductivity of the first thermal conductive adhesive layer 7 is smaller than the thermal conductivity of the second thermal conductive adhesive layer 8, and is used to reduce the temperature difference between the battery cell modules.

[0047] The specific type of the battery cell module can be set according to actual needs, and there is no restriction on this. For example, the battery module is a lithium battery with high energy density and long cycle life. The number of battery cell modules is set as needed, and there is no restriction on this. The liquid inlet 3 and the liquid outlet 4 are kept at a certain distance from the battery cell module array 1 for easy inspection and maintenance. In one example, the liquid inlet 3 and the liquid outlet 4 are arranged along the second direction, and the second direction is perpendicular to the first direction. The specific intensity of the first direction and the second direction is set according to actual needs. For example, the first direction can be the length direction of the liquid cooling plate 2, and the second direction can be the width direction of the liquid cooling plate 2.

[0048] like Figure 6As shown, the flow channel is filled with cooling medium. The middle partition 6 divides the liquid cooling plate 2 into two parts, so that the cooling medium flows along a predetermined path. Specifically, after the cooling medium flows in from the liquid inlet 3, the cooling medium moves from bottom to top in the left area as a whole, and after turning back, the cooling medium moves downward from the right area, and finally flows out from the liquid outlet 4. Under the driving action of the external circulation pump, it is cooled and flows into the liquid inlet 3 again, and the cycle repeats.

[0049] The material of the thermally conductive adhesive layer is set according to actual needs, and there is no specific restriction on this. The specific coating area of ​​the first thermally conductive adhesive layer 7 and the second thermally conductive adhesive layer 8 is obtained through verification or experiment according to actual needs, and there is no specific restriction on this. It should be noted that the coating area of ​​the first thermally conductive adhesive layer 7 is smaller than the area of ​​the second thermally conductive adhesive layer 8 to achieve better temperature uniformity of the battery core module. In addition, the thickness of the first thermally conductive adhesive layer 7 and the second thermally conductive adhesive layer 8 is set according to actual needs, and there is no specific restriction on this. Exemplarily, the thickness of the first thermally conductive adhesive layer 7 is not less than the thickness of the second thermally conductive adhesive layer 8. Optionally, the thermal conductivity of the first thermally conductive adhesive layer 7 is 0.53W / m·K, and the thickness is 1mm, and the thermal conductivity of the second thermally conductive adhesive layer 8 is 1.2W / m·K, and the thickness is 1mm.

[0050] According to the liquid-cooled energy storage battery pack of the embodiment of the present invention, by coating thermally conductive adhesives with different thermal conductivities on the battery cell module array, arranging a first thermally conductive adhesive layer at one end near the liquid inlet, and arranging a second thermally conductive adhesive in the remaining area, the heat dissipation between the battery cell module near the inlet of the liquid cooling plate and the liquid cooling plate can be appropriately weakened, and the temperature rise of the battery cell module at the inlet of the liquid cooling plate can be increased, so that the temperature difference between the battery cell modules in the liquid-cooled energy storage battery pack is reduced, and the temperature uniformity of the battery cell modules in the liquid-cooled energy storage battery pack is improved, thereby extending the cycle life of the energy storage battery pack and improving the overall performance of the liquid-cooled energy storage battery pack.

[0051] In some embodiments, in combination Figure 1 , Figure 7 As shown, the battery modules are symmetrically distributed along both sides of the middle partition 6. The symmetrical layout can make the heat load distribution of each battery module more uniform. The coating area of ​​the first thermal conductive adhesive layer 7 is 15%-30% of the bottom surface area of ​​the entire battery module array 1. This area ratio can ensure the necessary heat conduction and has a good effect on improving the temperature uniformity of the battery modules of the liquid-cooled energy storage battery pack.

[0052] The middle partition plate 6 is connected to the side wall of the liquid cooling plate 2 at one end close to the liquid inlet 3, and the other end of the middle partition plate 6 is separated from the side wall of the liquid cooling plate 2. The middle partition plate 6 can improve the structural stability of the liquid cooling plate 2 on the one hand, and guide the cooling medium to flow along the U-shaped path on the other hand to achieve a more uniform cooling effect.

[0053] like Figure 6As shown, a plurality of partitions 5 are provided along the first direction on both sides of the middle partition 6 inside the liquid cooling plate 2, and the partitions 5 define a flow channel. The partitions 5 are parallel to each other, which can reduce the impact of the cooling medium on the liquid cooling plate 2 at high flow rates and improve the strength and durability of the entire liquid cooling plate 2. The number, spacing and thickness of the partitions 5 are set according to actual needs, and there is no specific restriction on this. In one example, the partition 5 includes a first partition 51 and a second partition 52 that are parallel to each other, and the wall thickness of the first partition 51 is less than the wall thickness of the second partition 52. The second partition 52 can further improve the uniformity of the flow distribution of the cooling mechanism. The number of the first partition 51 and the second partition 52 is selected according to actual needs. In one example, two first partitions 51 and one second partition 52 are sequentially arranged along the second direction from the left edge of the liquid cooling plate 2, and so on. This solution can improve the cooling performance of the liquid cooling plate 2 and maintain a stable cooling effect under different working conditions.

[0054] In addition, the side wall of the battery cell module array 1 is separated from the side wall of the liquid cooling plate 2, so that the cooling medium can flow freely therein, thereby improving the cooling effect.

[0055] Combination Figure 7 , Figure 8 As shown, an embodiment of the present invention further provides a design method for a liquid-cooled energy storage battery pack, wherein the liquid-cooled energy storage battery pack adopts the liquid-cooled energy storage battery pack of the above embodiment, and the design method comprises the following steps:

[0056] Step S102, measuring the temperature of the upper surface of the battery cell module of the liquid-cooled energy storage battery pack in operation.

[0057] In this embodiment, the temperature of the upper surface of the battery cell module of the working liquid-cooled energy storage battery pack can be measured by experimental method or CFD (computational fluid dynamics) numerical simulation method. The advantage of the experimental method is that the temperature can be directly observed and measured. The advantage of the CFD numerical simulation method is that it can reduce the experimental cost and time.

[0058] For example, the temperature difference on the surface of the cell of the liquid-cooled energy storage battery pack at the end of charge and discharge reaches the maximum, which is about 3°C. The highest temperature appears on the cell near the coolant outlet, and the lowest temperature appears on the cell near the coolant inlet.

[0059] Step S104, determining the source of the overall temperature difference between the battery cell modules of the liquid-cooled energy storage battery pack through analysis.

[0060] In this embodiment, the overall temperature difference between the battery cell modules is caused by the uneven cooling of the bottom of the battery cell. Since the liquid cooling plate has only a single liquid inlet and liquid outlet, and the liquid inlet and liquid outlet are on the same side, no matter how the flow channel in the liquid cooling plate is designed, the temperature of the coolant that has just entered the liquid cooling plate has not undergone heat exchange with the battery cell module and is the lowest; the coolant that is about to flow out of the liquid cooling plate has undergone sufficient heat exchange with the battery cell module and has the highest temperature; the inconsistent temperature of the coolant at the liquid inlet and the liquid outlet is the fundamental reason for the temperature difference between the battery cell modules near the liquid inlet and the liquid outlet, and is also the source of the overall temperature difference between the battery cell modules of the liquid-cooled energy storage battery pack.

[0061] Step S106, dividing the contact area between the battery cell module and the liquid cooling plate into two areas, namely a first area adjacent to the liquid inlet and a second area excluding the first area, wherein the first area and the second area are used for coating thermal conductive adhesive.

[0062] In this embodiment, the area of ​​the first region is smaller than that of the second region. The first region is used for coating a first thermal conductive adhesive layer, and the second region is used for coating a second thermal conductive adhesive layer.

[0063] Step S108, calculating and obtaining the thermal conductivity of the thermally conductive adhesive, wherein the thermal conductivity of the thermally conductive adhesive in the first region is smaller than the thermal conductivity of the thermally conductive adhesive in the second region.

[0064] In this embodiment, for example, the temperature difference of the current liquid-cooled energy storage battery pack is 3°C through step S102. The bottom of the initial battery cell module is coated with thermal conductive glue, the thermal conductivity λ of the thermal conductive glue is 1.2W / m·K, the coating thickness δ is 1mm, the heating power Q of the battery cell module is 12W, and the battery cell module array size A is 174mm×72mm×204mm. Assuming that the heat generated by the battery cell module is dissipated through the liquid cooling plate at the bottom, the heat flux density q at the bottom of the battery cell is:

[0065]

[0066] The contact thermal resistance R is:

[0067]

[0068] The temperature difference Δt between the bottom surface of the cell and the upper surface of the liquid cooling plate is:

[0069] Δt=qR=957.85×0.00083℃=0.8℃

[0070] Assuming that the temperature difference of the liquid-cooled energy storage battery pack is reduced to 2°C, the temperature rise of the battery cell in the first area near the inlet (i.e., the first thermal conductive adhesive layer 7) needs to be increased by 1°C, and the temperature rise is increased by 1°C by increasing the contact thermal resistance between the bottom surface of this part of the battery cell module and the upper surface of the liquid cooling plate.

[0071] Then the temperature difference Δt′ is

[0072] Δt′=Δt+1=1.8℃

[0073] If the heat flux density at the bottom of the cell remains unchanged, the contact thermal resistance R should be:

[0074]

[0075] The coating thickness remains unchanged, and the thermal conductivity λ of the first thermal conductive adhesive coated in the first area is:

[0076]

[0077] Through calculation, the first thermal conductive glue with a thermal conductivity of 0.53 W / m·K is applied to region A with a thickness of 1 mm, while the second thermal conductive glue (initial thermal conductive glue) with a thermal conductivity of 1.2 W / m·K is applied to the second region with a thickness of 1 mm.

[0078] Step S110, determine whether the temperature difference between the cell modules of the liquid-cooled energy storage battery pack coated with thermal conductive adhesive meets the temperature difference requirement. If so, execute step S112. If not, continue to execute steps S106 to S110 to continuously optimize the three parameters of the area of ​​the first area, the second area and the thermal conductivity of the thermal conductive adhesive.

[0079] In this embodiment, an experiment combined with CFD numerical simulation is used to determine whether the temperature difference between the cell modules of a liquid-cooled energy storage battery pack coated with thermal conductive adhesive meets the temperature difference requirement.

[0080] Step S112, the design work of the liquid-cooled energy storage battery pack is terminated.

[0081] According to the design method of the liquid-cooled energy storage battery pack of the embodiment of the present invention, by coating thermally conductive adhesives with different thermal conductivities on the battery cell module array, arranging a first thermally conductive adhesive layer at one end near the liquid inlet, and arranging a second thermally conductive adhesive in the remaining area, the heat dissipation between the battery cell module near the inlet of the liquid cooling plate and the liquid cooling plate can be appropriately weakened, and the temperature rise of the battery cell module at the inlet of the liquid cooling plate can be increased, so that the temperature difference between the battery cell modules in the liquid-cooled energy storage battery pack is reduced, and the temperature uniformity of the battery cell modules in the liquid-cooled energy storage battery pack is improved, thereby extending the cycle life of the energy storage battery pack and improving the overall performance of the liquid-cooled energy storage battery pack.

[0082] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the description of the present invention, the directions or positional relationships indicated by the terms "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0086] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. 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.

[0088] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A liquid-cooled energy storage battery pack, characterized in that: include: A battery cell module array (1) comprises a plurality of battery cell modules; A liquid cooling plate (2) is arranged below the battery cell module array (1), a side of the liquid cooling plate (2) is provided with a liquid inlet (3) and a liquid outlet (4), a flow channel connected to the liquid inlet (3) and the liquid outlet (4) is arranged inside the liquid cooling plate (2), a middle partition (6) is arranged inside the liquid cooling plate (2) along a first direction, the middle partition (6) divides the bottom surface of the battery cell module array (1) into a left area and a right area, and the liquid inlet (3) is arranged adjacent to the left area; The thermally conductive adhesive layer comprises a first thermally conductive adhesive layer (7) and a second thermally conductive adhesive layer (8), wherein the first thermally conductive adhesive layer (7) is arranged at one end of the left region adjacent to the liquid inlet (3), and the second thermally conductive adhesive layer (8) is arranged on the bottom surface of the battery cell module array (1) excluding the remaining region of the first thermally conductive adhesive layer (7), and the thermal conductivity of the first thermally conductive adhesive layer (7) is smaller than the thermal conductivity of the second thermally conductive adhesive layer (8), so as to reduce the temperature difference between the battery cell modules.

2. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: The battery core modules are symmetrically distributed along the two sides of the middle partition (6), and the coating area of ​​the first thermal conductive adhesive layer (7) is 15%-30% of the bottom surface area of ​​the entire battery core module array (1).

3. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: The middle partition (6) is connected to the side wall of the liquid cooling plate (2) at one end close to the liquid inlet (3), and the other end of the middle partition (6) is separated from the side wall of the liquid cooling plate (2).

4. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: A plurality of partitions (5) are provided inside the liquid cooling plate (2) on both sides of the middle partition (6) along a first direction, and the partitions (5) define the flow channel.

5. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: The thickness of the first heat-conducting adhesive layer (7) is not less than the thickness of the second heat-conducting adhesive layer (8).

6. The liquid-cooled energy storage battery pack according to claim 4, characterized in that: The partition (5) comprises a first partition (51) and a second partition (52) which are parallel to each other, and the wall thickness of the first partition (51) is smaller than the wall thickness of the second partition (52).

7. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: The side wall of the battery cell module array (1) is separated from the side wall of the liquid cooling plate (2).

8. A method for designing a liquid-cooled energy storage battery pack as claimed in claim 1, characterized in that: include: S102, measuring the temperature of the upper surface of the battery cell module of the liquid-cooled energy storage battery pack in operation; S104, determining the source of the overall temperature difference between the battery cell modules of the liquid-cooled energy storage battery pack through analysis; S106, dividing the contact area between the battery cell module and the liquid cooling plate into two areas, namely a first area adjacent to the liquid inlet and a second area excluding the first area, wherein the first area and the second area are used for applying thermal conductive adhesive; S108, calculating and obtaining the thermal conductivity of the thermally conductive adhesive, wherein the thermal conductivity of the thermally conductive adhesive in the first region is less than the thermal conductivity of the thermally conductive adhesive in the second region; S110, determining whether the temperature difference between the cell modules of the liquid-cooled energy storage battery pack coated with the thermal conductive adhesive meets the temperature difference requirement, if so, executing step S112, if not, continuing to execute steps S106 to S110, and continuously optimizing the three parameters of the area of ​​the first region, the second region and the thermal conductivity of the thermal conductive adhesive; S112, the design work of the liquid-cooled energy storage battery pack is terminated.

9. The design method of the liquid-cooled energy storage battery pack according to claim 8, characterized in that: The temperature measurement of the upper surface of the battery cell module of the working liquid-cooled energy storage battery pack includes: The upper surface temperature of the battery cell module of the working liquid-cooled energy storage battery pack is measured by experimental method or CFD numerical simulation.

10. The design method of the liquid-cooled energy storage battery pack according to claim 8, characterized in that: The determining whether the temperature difference between the battery cell modules of the liquid-cooled energy storage battery pack coated with thermally conductive adhesive meets the temperature difference requirement includes: Through experiments combined with CFD numerical simulation, it is determined whether the temperature difference between the cell modules of the liquid-cooled energy storage battery pack coated with thermal conductive adhesive meets the temperature difference requirements.

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