Battery module with excellent heat dissipation performance and liquid-cooled battery pack

Abstract

The utility model relates to the technical field of energy storage batteries, in particular to a battery module with excellent heat dissipation performance, which comprises batteries, end plates, heat conduction fins and bundling pieces, the heat conduction fins are arranged on the two sides of the battery module, heat generated at the top end and the side face of the battery module is conducted out in time, the heat is dissipated in time in cooperation with the liquid cooling plate on the battery pack, the heat dissipation performance is excellent, the overall temperature of the battery module is reduced, and the heat exchange requirement of a battery under the large charge-discharge rate can be met; the upper and lower temperatures of the battery module are more uniform, the influence of large temperature difference on the use performance of the battery is avoided, and the service lives of the battery module and the battery pack are prolonged. Meanwhile, the liquid cooling battery pack is provided, the liquid cooling plate is arranged at the bottom ends of the multiple battery modules and can be matched with the heat conduction fins on the battery modules, efficient heat dissipation of the battery pack is achieved, the heat dissipation performance is good, the charging and discharging performance and the use safety of the battery pack are guaranteed, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and particularly relates to a battery module and a liquid-cooled battery pack with excellent heat dissipation performance. Background Art

[0002] As an important energy storage device in an energy storage system, an energy storage battery pack includes a plurality of battery modules composed of batteries connected in series. During use, the batteries generate a large amount of heat, which needs to be dissipated in time. Otherwise, it will affect the performance and service life of the battery pack. Currently, the commonly used liquid-cooled battery packs have been widely applied because they use liquid-cooling plates and the liquid flowing inside to take away the heat of the battery modules, and the heat dissipation effect is good. However, the traditional liquid-cooled battery packs mainly adopt the bottom plate liquid-cooling method, that is, only a liquid-cooling plate is provided at the bottom of the battery module to provide cooling and achieve heat exchange. It can only support the use scenario of the battery at a charge-discharge rate of 0.5P at most. If the charge-discharge rate is increased, such as 1P, it cannot meet the demand for efficient heat exchange, and the battery temperature can reach up to 45 - 55 °C, posing a great potential safety hazard. At the same time, the temperature difference between the upper and lower parts of the battery is large. This uneven temperature distribution will lead to unevenness in battery performance, affecting the charge-discharge performance and service life of the battery. Therefore, based on the above problems, the heat dissipation performance of the liquid-cooled battery pack needs to be further improved. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a battery module and a liquid-cooled battery pack with excellent heat dissipation performance to solve the existing technical problems in the above background art.

[0004] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] On the one hand, the present application provides a battery module with excellent heat dissipation performance, including batteries, end plates, heat-conducting fins, and binding members. A plurality of the batteries are arranged side by side. The end plates are symmetrically arranged at both ends of the batteries. The heat-conducting fins are symmetrically arranged on both side edges of the batteries. The end plates, heat-conducting fins, and batteries are fixed through the binding members.

[0006] Based on the above technical solution, the heat-conducting fin includes a heat-conducting bottom plate and a heat-conducting side plate, and the heat-conducting side plate is fixedly arranged with the heat-conducting bottom plate.

[0007] Based on the above technical solution, the heat-conducting side plate includes a heat-conducting part A and a heat-insulating part B. A heat-conducting adhesive is arranged on the heat-conducting part A, and heat-insulating cotton or a heat-insulating pad is arranged on the heat-insulating part B.

[0008] Based on the above technical solution, the thickness of the heat-insulating part B is equal to or less than the thickness of the heat-conducting part A.

[0009] Based on the above technical solution, the heat-conducting fins are made of metal material with high thermal conductivity.

[0010] Based on the above technical solution, the binding piece is configured as a steel belt.

[0011] Based on the above technical solution, heat insulation cotton is provided between the end plate and the battery.

[0012] On the other hand, the present application also provides a liquid-cooled battery pack, including the above-mentioned battery module with excellent heat dissipation performance, and also including a liquid cooling plate, wherein the battery module is provided with multiple at the top of the liquid cooling plate, and cooling liquid flows in the liquid cooling plate.

[0013] On the basis of the above technical solution, the liquid cooling plate is symmetrically provided with baffles, and the baffles are provided correspondingly to the end plates and have compatible structures.

[0014] Based on the above technical solution, thermal conductive glue is provided between the bottom end of the battery module and the top end of the liquid cooling plate.

[0015] The beneficial effects of the technical solution provided by the utility model are:

[0016] The utility model provides a battery module with excellent heat dissipation performance.

[0017] The present invention provides a battery module with excellent heat dissipation performance. By providing thermally conductive fins on both sides of the battery module, efficient heat dissipation can be achieved. Heat generated at the top and sides of the battery module is promptly conducted away, and the liquid cooling plate on the battery pack also dissipates the heat promptly. This excellent heat dissipation performance reduces the overall temperature of the battery module, meeting the heat exchange requirements of the battery at high charge and discharge rates. Furthermore, the temperature between the top and bottom of the battery module is more uniform, reducing temperature differences, thus preventing the impact of large temperature differences on battery performance and improving the service life of the battery module and battery pack. A liquid-cooled battery pack utilizing the above-described battery module is also provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery module in the present utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the battery module in the present invention from another angle;

[0020] Figure 3 This is a partial exploded view of the battery module in the present invention;

[0021] Figure 4 This is a schematic structural diagram of the heat-conducting fins in the present invention;

[0022] Figure 5This is a front view of the heat-conducting fins in the utility model;

[0023] Figure 6 It is a schematic structural diagram of the liquid-cooled battery pack in the present utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the liquid cooling plate in the utility model;

[0025] Figure 8 This is a schematic diagram of the overall structure of the liquid-cooled battery pack in the present invention; DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0028] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] like Figures 1 to 8 As shown, a battery module with excellent heat dissipation performance includes a battery 1, an end plate 2, a thermal conductive rib 3 and a strapping piece 4. The battery 1 is arranged in multiple rows, the end plates 2 are symmetrically arranged at both ends of the battery 1, and the thermal conductive ribs 3 are symmetrically arranged on both sides of the battery 1. The end plates 2, the thermal conductive ribs 3 and the battery 1 are fixed by the strapping piece 4.

[0030] The present invention provides a battery module with excellent heat dissipation performance. By arranging heat-conducting ribs 3 on both sides of the battery module, efficient heat dissipation of the battery module can be achieved, and the heat generated at the top and sides of the battery module can be promptly conducted out. In conjunction with the liquid cooling plate on the battery pack, the heat can be promptly dissipated. The excellent heat dissipation performance can reduce the overall temperature of the battery module, and can meet the heat exchange requirements of the battery at a larger charge and discharge rate. At the same time, the upper and lower temperatures of the battery module can be made more uniform, the temperature difference can be reduced, the influence of the large temperature difference on the battery performance can be avoided, and the service life of the battery module and the battery pack can be improved.

[0031] More preferably, compared with the directly added side liquid cooling plate in the existing improved structure, there is no need to additionally add a coolant pipeline and water inlet and outlet, which reduces the production and processing cost, improves the production efficiency, and reduces the liquid leakage risk and potential safety hazard of the product.

[0032] Based on the above technical solution, the heat conducting fin 3 includes a heat conducting bottom plate 31 and a heat conducting side plate 32, and the heat conducting side plate 32 is fixedly arranged with the heat conducting bottom plate 31.

[0033] In one preferred embodiment, the heat conducting fin 3 is in an L-shaped structure, that is, heat conducting fins 3 are arranged on both sides of the battery, and the heat at the top of the battery module is conducted to the liquid cooling plate 5 through the heat conducting fins 3, so as to timely dissipate the heat at the top of the battery module, reduce the temperature difference between the upper and lower parts of the battery module, and have better temperature uniformity.

[0034] In another preferred embodiment, the heat conducting fin 3 is in a U-shaped structure, that is, the bottom edges of two L-shaped heat conducting fins are connected through, and are sleeved on two side edges and the bottom edge of the battery module, and the heat exchange effect is better.

[0035] Based on the above technical solution, the heat conducting side plate 32 includes a heat conducting part A 321 and a heat insulating part B 322, a heat conducting adhesive is arranged on the heat conducting part A 321, and a heat insulating cotton or a heat insulating pad is arranged on the heat insulating part B 322.

[0036] Preferably, two areas of a heat conducting part A 321 and a heat insulating part B 322 are arranged on the heat conducting side plate 32 of the heat conducting fin 3. A heat conducting adhesive is applied to the heat conducting part A 321, and a material with low heat conductivity such as aerogel is pasted on the heat insulating part B 322, such as heat insulating cotton. During the heat dissipation process of the battery module, since heat conducting fins 3 are arranged on both sides of the battery module, and the heat conductivity coefficient of the heat conducting fin 3 is greater than that of the battery 1, the heat at the top of the battery module is preferentially directly conducted from the side heat conducting fins 3 to the liquid cooling plate 5 for heat dissipation; the heat conducting part A 321 is provided with a heat conducting adhesive with a high heat conductivity coefficient, which is in contact with the top of the battery module to quickly export the heat at the top of the battery module, and is cooperated with the heat insulating part B 322 area on the side to be provided with a heat insulating material with a lower heat conductivity coefficient, that is, heat insulating cotton or a heat insulating pad for blocking, so that the heat is not imported into the battery 1 as much as possible, and at the same time, the cold quantity will not be consumed in advance during the process of reaching the liquid cooling plate 5, thereby reducing the overall temperature of the battery cell and having a more excellent heat dissipation effect.

[0037] Based on the above technical solution, the thickness of the heat insulating part B 322 is equal to or less than the thickness of the heat conducting part A 321.

[0038] In one preferred embodiment, the thickness of the heat-insulating part B 322 is the same as that of the heat-conducting part A 321. That is, a heat-conducting adhesive is provided between the heat-conducting part A 321 and the battery 1. Correspondingly, a heat-insulating cotton with the same thickness is provided between the heat-insulating part B 322 and the battery 1. The working principle is the same as above and will not be elaborated here.

[0039] In another preferred embodiment, the thickness of the heat-insulating part B 322 is less than that of the heat-conducting part A 321. That is, as Figure 5 shown, a stepped structure is formed between the heat-insulating part B 322 and the heat-conducting part A 321. In this stepped structure, in one form, a heat-conducting adhesive is provided between the heat-conducting part A 321 and the battery 1, and a heat-insulating cotton or a heat-insulating spacer with the same thickness as the heat-conducting adhesive is provided on the heat-insulating part B 322. In this way, there is no direct contact between the heat-insulating spacer and the battery 1, that is, an air heat-insulating layer is formed in this area. Used together with the heat-insulating material, it reduces the heat introduced into the battery 1 and directly conducts the heat to the liquid-cooling plate to take away the heat, achieving better heat dissipation performance. In another form, a heat-conducting adhesive is provided between the heat-conducting part A 321 and the battery 1, and a heat-insulating cotton or a heat-insulating spacer with a thickness greater than that of the heat-conducting adhesive is provided on the heat-insulating part B 322, which is filled between the heat-insulating part and the battery, and can also reduce the heat introduced into the battery without affecting the heat dissipation of the battery, ensuring the use performance and service life of the battery.

[0040] Based on the above technical solution, the heat-conducting fin 3 is made of a metal material with high heat-conducting performance. Preferably, the heat-conducting fin 3 is made of a metal material with excellent heat-conducting performance to improve the heat exchange effect. Specifically, it can be made of copper or aluminum.

[0041] Based on the above technical solution, the bundling member 4 is set as a steel strip.

[0042] Preferably, the bundling member 4 is a steel strip. Specifically, the assembly of the battery module in this embodiment is as follows: a plurality of batteries 1 are placed side by side, then heat-conducting fins 3 are provided on both sides of the batteries 1, end plates 2 are provided at both ends of the batteries 1, and finally the whole battery module structure is fixed by sleeving a steel strip on the outermost side, that is, the assembly of the battery module is completed.

[0043] Based on the above technical solution, a heat-insulating cotton is provided between the end plate 2 and the battery 1. In a preferred embodiment, a heat-insulating cotton is provided between the end plate 2 and the battery 1 to play a heat-insulating role.

[0044] On the other hand, the present application also provides a liquid-cooled battery pack, which includes the above battery module with excellent heat dissipation performance, and also includes a liquid-cooling plate 5. A plurality of the battery modules are provided at the top of the liquid-cooling plate 5, and a coolant flows in the liquid-cooling plate 5.

[0045] The liquid-cooled battery pack provided in this application has a liquid-cooling plate arranged at the bottom of multiple battery modules, which can cooperate with the heat-conducting fins on the battery modules to achieve efficient heat dissipation of the battery pack. That is, the heat generated at the top of the battery modules is conducted to the liquid-cooling plate through the heat-conducting fins, and then the heat is carried away by the coolant circulating in the liquid-cooling plate. It has good heat dissipation performance, ensures the charge and discharge performance and use safety of the battery pack, and improves the service life.

[0046] Based on the above technical solution, baffles 6 are symmetrically arranged on the liquid-cooling plate 5, and the baffles 6 are correspondingly arranged with the end plates 2 and have a structurally adapted relationship.

[0047] In a preferred embodiment, by fixedly arranging baffles 6 on the liquid-cooling plate 5, the positions corresponding to those of the end plates 2 and the structures adapted to those of the end plates 2, the positioning and assembly of the battery modules can be achieved. At the same time, through holes can be arranged on the end plates 2, and only one bolt fixing part is needed to fix the end plates and the baffles, that is, to fix the battery modules and the liquid-cooling plate, reducing the assembly materials and improving the assembly efficiency.

[0048] Based on the above technical solution, a heat-conducting adhesive is arranged between the bottom end of the battery module and the top end of the liquid-cooling plate 5. By filling a heat-conducting adhesive between the battery module and the liquid-cooling plate 5, the heat-conducting performance between the bottom end of the battery module and the liquid-cooling plate 5 is increased, enabling the liquid-cooling plate 5 to carry away the heat generated during the operation of the battery module in a timely manner and achieving cooling.

[0049] In a more preferred embodiment, a cover body 7 is further arranged on the liquid-cooling plate 5. The cover body 7 is sleeved outside multiple battery modules, and a BMS management system 8 is arranged on the cover body 7; thus realizing the basic functions of the liquid-cooled battery pack.

[0050] In addition, the structure of the liquid-cooled package in this application is simulated for a relatively large charge and discharge rate of 1P. Since heat-conducting fins are arranged on the side of each battery module, and the heat-conducting coefficient of the heat-conducting fins is greater than that of the battery itself, the heat at the top of the battery can be preferentially conducted down through the heat-conducting fins and carried away by the liquid-cooling plate, effectively reducing the temperature of the overall battery, and at least reducing it to below 40°C. The safety performance of the battery module is effectively guaranteed at this working temperature.

[0051] The above shows and describes the basic principles and main features of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

[0052] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery module with excellent heat dissipation performance, characterized in that, It includes a battery (1), end plates (2), heat-conducting fins (3) and a binding member (4). A plurality of the batteries (1) are arranged side by side. The end plates (2) are symmetrically arranged at both ends of the battery (1). The heat-conducting fins (3) are symmetrically arranged on both sides of the battery (1). The end plates (2), the heat-conducting fins (3) and the battery (1) are fixed by the binding member (4). The heat-conducting fin (3) includes a heat-conducting bottom plate (31) and a heat-conducting side plate (32). The heat-conducting side plate (32) is fixedly arranged with the heat-conducting bottom plate (31).

2. The battery module with excellent heat dissipation performance according to claim 1, wherein, The heat-conducting side plate (32) includes a heat-conducting part A (321) and a heat-insulating part B (322). A heat-conducting adhesive is arranged on the heat-conducting part A (321). Heat-insulating cotton or heat-insulating pads are arranged on the heat-insulating part B (322).

3. The battery module with excellent heat dissipation performance according to claim 2, characterized in that, The thickness of the heat-insulating part B (322) is equal to or less than the thickness of the heat-conducting part A (321).

4. A battery module with excellent heat dissipation performance according to claim 1, characterized in that, The heat-conducting fin (3) is made of a metal material with high heat-conducting performance.

5. A battery module with excellent heat dissipation performance according to claim 1, characterized in that, The binding member (4) is arranged as a steel strip.

6. The battery module with excellent heat dissipation performance according to claim 1, wherein, Heat-insulating cotton is arranged between the end plate (2) and the battery (1).

7. A liquid-cooled battery pack, characterized in that, It includes the battery module with excellent heat dissipation performance according to any one of claims 1 to 6, and also includes a liquid-cooling plate (5). A plurality of the battery modules are arranged at the top of the liquid-cooling plate (5). A coolant flows in the liquid-cooling plate (5).

8. The liquid-cooled battery pack according to claim 7, characterized in that, Blocking strips (6) are symmetrically arranged on the liquid-cooling plate (5). The blocking strips (6) are arranged corresponding to the end plates (2) and have a structurally adapted relationship.

9. The liquid-cooled battery pack according to claim 7, characterized in that, A heat-conducting adhesive is arranged between the bottom end of the battery module and the top end of the liquid-cooling plate (5).

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