Liquid-cooled battery pack

Abstract

The utility model relates to the technical field of energy storage batteries, in particular to a liquid-cooled battery pack which comprises a liquid-cooled bottom plate, a battery module and heat exchange fins, the liquid cooling bottom plate is arranged at the bottom end of the battery module, and the heat exchange fins are arranged among the plurality of battery modules, so that heat generated by the side parts and the top of the battery module is dissipated, the temperature of the top of the battery module is reduced, the temperature distribution of the battery module is uniform, the problems of large temperature difference between the upper part and the lower part of the battery module and non-uniform temperature are solved, and the service life of the battery module is prolonged. The use performance of the battery module is ensured and the service life is prolonged. By arranging the matched positioning structures on the end plates and the barrier strips, positioning and assembling are facilitated, namely, the battery module is more convenient to fix and install, the fixing constraint of the battery module in multiple dimensions in the left-right direction and the front-back direction can be increased, and the adverse effect on the battery pack caused by shaking or moving of the liquid cooling pack in the transportation process is prevented. Meanwhile, the number of fixing assemblies can be reduced, cost is reduced, and assembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, in particular to a liquid-cooled battery pack. Background Art

[0002] Current energy storage liquid-cooled battery pack products are usually composed of multiple battery modules. During operation, the heat generated by the battery module is conducted and carried away through the liquid cooling plate set at the bottom and the coolant flowing inside it. Although the temperature difference between each battery module set in parallel can be controlled to be small, for a single battery module, since cooling and heat dissipation are only achieved at the bottom, the temperature difference between the upper and lower parts of the battery is large, generally 10°C or above. If the charging and discharging power is large, the upper and lower temperature difference of a single battery will be even greater, resulting in uneven temperature between the upper and lower parts of a single battery module, which will affect the charging and discharging performance of the battery, thereby affecting the performance and life of the entire battery pack. In addition, the fixation between the existing battery module and the liquid cooling base plate is mainly achieved by fixing the middle plate of the battery module to the liquid cooling plate through multiple bolts. Multiple battery modules in the battery pack require multiple bolt connectors, which increases material costs and assembly labor costs. Therefore, based on the above problems, the existing technology needs to be further improved. Utility Model Content

[0003] The purpose of the present invention is to provide a liquid-cooled battery pack to solve the existing technical problems existing in the above-mentioned background technology.

[0004] In order to solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: a liquid-cooled battery pack is provided, including a liquid-cooled base plate, a battery module and heat exchange fins. The liquid-cooled base plate is arranged at the bottom end of the battery module and a circulating coolant is arranged inside. The battery modules are provided in multiple groups and arranged in parallel. The heat exchange fins are correspondingly arranged between the battery modules, and the bottom ends of the heat exchange fins are fixedly connected to the liquid-cooled base plate.

[0005] Based on the above technical solution, the heat exchange fins are configured as a Y-shaped or I-shaped structure.

[0006] Based on the above technical solution, the battery module includes battery cells, end plates and strapping steel strips. The battery cells are provided in plurality and connected in series. The end plates are symmetrically arranged at both ends of the battery cells and fixed by strapping steel strips.

[0007] On the basis of the above technical solution, it also includes a stop bar, which is fixedly arranged on the liquid cooling bottom plate and corresponding to the end plate.

[0008] Based on the above technical solution, a positioning structure is provided between the end plate and the stop bar.

[0009] Based on the above technical solution, the positioning structure includes a first sawtooth and a second sawtooth, the first sawtooth is arranged at the bottom end of the end plate, the second sawtooth is arranged at the top end of the block bar, and the first sawtooth and the second sawtooth structures are adapted to each other.

[0010] Based on the above technical solution, the first saw teeth and the second saw teeth both include transverse saw teeth and longitudinal saw teeth and are alternately arranged.

[0011] Based on the above technical solution, the positioning structure includes a positioning column and a positioning hole. The positioning column is arranged at the bottom end of the end plate or the top end of the stop bar, and the positioning hole is correspondingly arranged at the top end of the stop bar or the bottom end of the end plate. The positioning column and the positioning hole are adapted to each other.

[0012] Based on the above technical solution, a heat-conducting structural adhesive is provided between the bottom end of the battery module and the liquid-cooling base plate, and a heat-conducting gasket or heat-conducting structural adhesive is provided between the two sides of the battery module and the heat exchange ribs.

[0013] Based on the above technical solution, the heat exchange fins and the liquid cooling base plate are configured as an integrally formed structure.

[0014] The beneficial effects of the technical solution provided by the utility model are:

[0015] The present invention provides a liquid-cooled battery pack. A liquid-cooling base plate is provided at the bottom end of the battery module. The circulating coolant provided therein can promptly remove the heat generated by the battery module. At the same time, heat exchange ribs are provided between multiple battery modules. The height of the heat exchange ribs is adapted to the height of the battery module. The heat generated by the sides and top of the battery module is dissipated, so that the temperature of the top of the battery module is reduced and the temperature of the battery module is evenly distributed, thereby solving the problem of large temperature difference and uneven temperature between the upper and lower parts of the battery module, ensuring the performance of the battery module and extending the service life.

[0016] 2. By providing matching positioning structures on the end plates and stop bars, positioning and assembly between the end plates and stop bars are facilitated, making the fixed installation of the battery module more convenient. This can also provide additional fixed constraints in multiple dimensions, such as left and right, and front and back, to prevent the liquid cooling pack from shaking or moving during transportation and causing adverse effects on the battery pack. This also reduces the number of fixed components, reduces costs, and improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the Y-shaped heat exchange fin structure in the utility model;

[0019] Figure 3This is a schematic diagram of the heat exchange fin structure of the I-type structure in the utility model;

[0020] Figure 4 This is a schematic structural diagram of the battery module in the present utility model;

[0021] Figure 5 It is a structural diagram of the middle end plate of the utility model; DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] 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.

[0024] 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.

[0025] like Figures 1 to 5 As shown, a liquid-cooled battery pack includes a liquid-cooled base plate 1, a battery module 2 and a heat exchange fin 3. The liquid-cooled base plate 1 is arranged at the bottom end of the battery module 2 and has a circulating coolant inside. The battery modules 2 are provided in multiple groups and arranged in parallel. The heat exchange fins 3 are correspondingly arranged between the battery modules 2, and the bottom ends of the heat exchange fins 3 are fixedly connected to the liquid-cooled base plate 1.

[0026] The present invention provides a liquid-cooled battery pack, in which a liquid-cooling base plate 1 is provided at the bottom end of the battery module 2, and the circulating coolant provided therein can promptly remove the heat generated by the battery module. At the same time, heat exchange ribs 3 are provided between multiple battery modules 2. The height of the heat exchange ribs 3 is adapted to the height of the battery module 2, and the heat generated by the side and top of the battery module 2 is dissipated, so that the temperature of the top of the battery module is reduced and the temperature of the battery module is evenly distributed, thereby solving the problem of large temperature difference and uneven temperature between the upper and lower parts of the battery module, ensuring the performance of the battery module, and extending the service life.

[0027] Based on the above technical solution, the heat exchange fins 3 are configured as a Y-shaped or I-shaped structure.

[0028] In one preferred embodiment, Figure 2 As shown, the heat exchange ribs 3 are arranged in a Y-shape, and the two outer side walls of the heat exchange ribs 3 are respectively pressed against the sides of the adjacent battery modules 2 to eliminate the heat generated by the battery modules 2 by heat exchange; it can also be understood that the heat exchange ribs 3 between the two battery modules 2 are Y-shaped, and the heat exchange ribs arranged on the outer side walls of the end battery modules are half of the Y-shaped structure, which can be flexibly arranged according to actual usage requirements.

[0029] In another preferred embodiment, Figure 3 As shown, the heat exchange fins 3 are set to I type, the contact area between the two sides and the battery module is larger, and the heat exchange effect is good.

[0030] Based on the above technical solution, the battery module 2 includes a battery cell 21, an end plate 22 and a bundling steel belt 23. The battery cell 21 is provided in plurality and connected in series. The end plates 22 are symmetrically arranged at both ends of the battery cell 21 and fixed by the bundling steel belt 23.

[0031] The battery module 2 is composed of a plurality of battery cells 21 and end plates 22 at both ends. The battery cells 21 and the end plates 22 are fixed with a binding steel belt 23 of corresponding size, and a certain pressure is generated to prevent them from falling off.

[0032] On the basis of the above technical solution, a stop bar is further included. The stop bar 4 is fixedly arranged on the liquid cooling base plate 1 and is arranged corresponding to the end plate 22 .

[0033] In this embodiment, two stop bars 4 are symmetrically arranged on the liquid-cooled base plate 1, corresponding to the position of the end plate 22 of the battery module 2, to limit the installation of the battery module 2; the stop bars 4 are fixedly connected to the liquid-cooled base plate 1 by welding, which facilitates the installation and fixation of multiple battery modules 2 on the liquid-cooled base plate 1.

[0034] Based on the above technical solution, a positioning structure is provided between the end plate 22 and the stop bar 4 .

[0035] In the prior art, a battery module typically has two end plates, each with two fixing bolts. This means four bolts are required to secure a battery module to the liquid cooling plate. For a battery pack with four battery modules, 16 bolts are required for the secure connection, increasing material and labor costs and reducing assembly efficiency. In this embodiment, matching positioning structures are provided on the end plates and the retaining bars. The end plates are provided with through-holes that accommodate bolts. This allows for the securement of the end plates and retaining bars, securing the battery modules with only one bolt. This not only facilitates assembly, reduces material and labor costs, but also effectively secures the battery modules in multiple dimensions, both left and right, and front and back.

[0036] Based on the above technical solution, the positioning structure includes a first serration 5 and a second serration 6. The first serration 5 is arranged at the bottom end of the end plate 22, and the second serration 6 is arranged at the top end of the bar 4. The first serration 5 and the second serration 6 are structurally adapted.

[0037] On the basis of the above technical solution, the first saw teeth 5 and the second saw teeth 6 both include transverse saw teeth and longitudinal saw teeth and are alternately arranged.

[0038] In one preferred embodiment, the end plate 22 and the stop bar 4 are provided with a first serration 5 and a second serration 6 structure that matches each other, so as to facilitate the positioning and assembly between the end plate 22 and the stop bar 4, that is, the fixed installation of the battery module 2 is more convenient, and the fixed constraints of the battery module 2 in multiple dimensions such as left and right, front and back can be increased to prevent the liquid cooling pack from shaking or moving during transportation and causing adverse effects on the battery pack. In a more preferred embodiment, as Figure 2 and Figure 5 As shown, the specific structure of the first serrations 5 and the second serrations 6 is alternately arranged transverse serrations and longitudinal serrations, which provide a more stable matching relationship, better positioning effect, and convenient assembly.

[0039] Based on the above technical solution, the positioning structure includes a positioning column and a positioning hole. The positioning column is arranged at the bottom end of the end plate 22 or the top end of the stop bar 4, and the positioning hole is correspondingly arranged at the top end of the stop bar 4 or the bottom end of the end plate 22. The positioning column and the positioning hole are adapted to each other.

[0040] In another preferred embodiment, the positioning structure selects a method of matching positioning columns and positioning holes, which is not shown in the figure, to achieve rapid positioning and assembly of the end plate and the baffle, and at the same time can also better prevent the battery module from moving or shaking. The number of positioning columns and positioning holes can be selected according to the applicability of the actual battery module, which has better applicability.

[0041] Based on the above technical solution, a heat-conducting structural adhesive is provided between the bottom end of the battery module 2 and the liquid-cooling base plate 1 , and a heat-conducting gasket or heat-conducting structural adhesive is provided between both sides of the battery module 2 and the heat exchange ribs 3 .

[0042] Preferably, a thermally conductive structural adhesive is provided between the bottom of the battery module 2 and the liquid-cooled base plate 1, and a thermally conductive gasket or a thermally conductive structural adhesive is provided at the position where the side of the battery module 2 contacts the heat exchange ribs 3, which can enhance the thermal conductivity and achieve efficient heat dissipation of the battery module, which is beneficial to reducing the temperature difference on the battery module.

[0043] Based on the above technical solution, the heat exchange fins 3 and the liquid cooling base plate 1 are configured as an integrally formed structure. In a preferred embodiment, the heat exchange fins 3 and the liquid cooling base plate 1 form an integrally formed structure, which is more stable.

[0044] The basic principles and main features of the present invention are shown and described above. It is obvious to those skilled in the art 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-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A liquid-cooled battery pack, characterized in that: The invention comprises a liquid cooling base plate (1), a battery module (2), a heat exchange rib (3) and a stop bar (4), wherein the liquid cooling base plate (1) is arranged at the bottom end of the battery module (2) and is provided with a circulating coolant inside, the battery module (2) is provided with multiple groups and arranged in parallel, the heat exchange ribs (3) are correspondingly arranged between the battery modules (2), and the bottom ends of the heat exchange ribs (3) are fixedly connected to the liquid cooling base plate (1); the battery module (2) comprises an end plate (22), the stop bar (4) is fixedly arranged on the liquid cooling base plate (1) and is correspondingly arranged to the end plate (22), the end plate is provided with a through hole structure, bolts are installed in the through hole structure to achieve the fixation of the end plate and the stop bar, and the end plate (22) and the stop bar (4) are provided with corresponding positioning structures.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The heat exchange fins (3) are configured as a Y-shaped or I-shaped structure.

3. The liquid-cooled battery pack according to claim 1, characterized in that: The battery module (2) comprises a battery cell (21) and a binding steel belt (23), wherein a plurality of battery cells (21) are provided and connected in series, and the end plates (22) are symmetrically arranged at both ends of the battery cell (21) and fixed by the binding steel belt (23).

4. The liquid-cooled battery pack according to claim 1, characterized in that: The positioning structure comprises a first saw tooth (5) and a second saw tooth (6), wherein the first saw tooth (5) is arranged at the bottom end of the end plate (22), and the second saw tooth (6) is arranged at the top end of the stop bar (4), and the first saw tooth (5) and the second saw tooth (6) are structurally compatible.

5. The liquid-cooled battery pack according to claim 4, characterized in that: The first saw teeth (5) and the second saw teeth (6) both comprise transverse saw teeth and longitudinal saw teeth, which are arranged alternately.

6. The liquid-cooled battery pack according to claim 1, characterized in that: The positioning structure comprises a positioning column and a positioning hole, wherein the positioning column is arranged at the bottom end of the end plate (22) or the top end of the stop bar (4), and the positioning hole is correspondingly arranged at the top end of the stop bar (4) or the bottom end of the end plate (22), and the positioning column and the positioning hole are adapted to each other.

7. The liquid-cooled battery pack according to claim 1, characterized in that: A heat-conducting structural adhesive is provided between the bottom end of the battery module (2) and the liquid cooling base plate (1), and a heat-conducting gasket or heat-conducting structural adhesive is provided between both sides of the battery module (2) and the heat exchange ribs (3).

8. The liquid-cooled battery pack according to claim 1, characterized in that: The heat exchange fins (3) and the liquid cooling base plate (1) are configured as an integrally formed structure.

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