Battery cell module, battery module and battery pack

Abstract

The utility model relates to the technical field of lithium batteries, and provides a battery cell module, a battery module and a battery pack, the battery cell module comprises a module body, and the module body comprises a plurality of battery cell monomers arranged in parallel; the liquid cooling plates are arranged on two opposite sides of the module body; the liquid cooling plate comprises outer walls and a cooling liquid flow channel defined between the outer walls, the outer wall on one side is used for being matched with the side face of the module body to form a heat exchange wall, the outer side face of the heat exchange wall is attached to the side face of the module body, and fins are arranged on the inner side face of the heat exchange wall. Through the arrangement, the heat exchange area can be effectively increased, the heat exchange effect is improved, the liquid cooling plate is separated from the battery box instead of being integrated at the bottom of the battery box, and the space utilization rate and the convenience of battery repair and maintenance are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium battery, especially to a battery cell module, a battery module and a battery pack. BACKGROUND

[0002] The charging speed of a lithium battery system is related to the temperature and current of the battery cell during charging. In actual working conditions, the battery system is often charged with a large current, and the temperature of the battery system rises. At this time, a water cooling system is needed to cool the battery system, so that the battery system can be maintained in a suitable temperature range for large-current charging.

[0003] In related technologies, for square battery cells, the most widely used solution at present is to integrate a water cooling plate with a battery box, so that the lower mounting surface of the battery cell is in close contact with the liquid cooling plate for heat exchange. The water cooling plate is connected to the water cooling circulation system of the whole vehicle and the water cooling plate of the battery system through a water cooling pipeline, and water circulation is realized under the drive of a water pump to achieve the purpose of heat dissipation for the battery system.

[0004] However, due to the area of the lower mounting surface of the battery cell, the water cooling plate and the battery cell cannot be fully heat exchanged to remove the heat of the battery cell, so it is difficult to achieve the best heat dissipation effect.

[0005] Therefore, how to further improve the heat dissipation effect and thus improve the performance of the lithium battery is an important issue to be solved at present. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of battery cell module, battery module and battery pack to solve the defect that it is difficult to achieve the best heat dissipation effect in prior art limited by the area of the lower mounting surface of battery cell, can further increase heat exchange area, improve heat exchange effect, and then improve the performance of battery.

[0007] The utility model provides a kind of battery cell module, comprising:

[0008] Module body, the module body includes a plurality of battery cell monomers arranged side by side;

[0009] Liquid cooling plate is arranged at the opposite sides of the module body;The liquid cooling plate includes outer wall and cooling liquid flow channel surrounded in the outer wall, the outer wall of one side is used to cooperate with the side surface of the module body to form heat exchange wall, the outer side surface of the heat exchange wall is attached to the side surface of the module body, and fin is arranged on the inner side surface.

[0010] According to the battery cell module provided by the utility model, the liquid cooling plate is of hollow structure, and the fins are fully distributed on the inner side surface of the heat exchange wall.

[0011] According to the battery cell module provided by the utility model, a flexible heat-conducting pad is arranged between the heat exchange wall and the side surface of the module body.

[0012] According to the electric core module provided by the utility model, one end of the liquid cooling plate is provided with an inlet, and the inlet positions on the liquid cooling plate located on both sides of the module body correspond to each other.

[0013] And / or, the other end of the liquid cooling plate is provided with an outlet, and the outlet positions on the liquid cooling plate located on both sides of the module body correspond to each other.

[0014] According to the electric core module provided by the utility model, the heating device is connected to the outer wall of the liquid cooling plate.

[0015] According to the electric core module provided by the utility model, the heating device comprises a PTC heating strip, and the PTC heating strip is arranged along the length direction of the module body.

[0016] According to the electric core module provided by the utility model, the liquid cooling plate is provided with a mounting groove extending along the length direction on the outer wall of the other side of the module body, and the PTC heating strip is embedded in the mounting groove.

[0017] The utility model also provides a battery module, which comprises: a plurality of groups of the electric core module as described above arranged side by side, so that the liquid cooling plate of the electric core module is located between the module bodies of adjacent electric core modules.

[0018] According to the battery module provided by the utility model, the battery module further comprises an inlet system and / or an outlet system.

[0019] The inlet system comprises an inlet main pipe and an inlet branch pipe; the inlet main pipe is connected to the inlets of the plurality of liquid cooling plates through the plurality of inlet branch pipes.

[0020] The outlet system comprises a collecting pipe and an outlet branch pipe; the collecting pipe is connected to the outlets of the plurality of liquid cooling plates through the plurality of outlet branch pipes.

[0021] According to the battery module provided by the utility model, the inlets on the liquid cooling plates located on both sides of the module body are connected through an inlet connecting pipe, and the inlet branch pipe is detachably connected to the inlet connecting pipe.

[0022] And / or, the outlets on the liquid cooling plates located on both sides of the module body are connected through an outlet connecting pipe, and the outlet branch pipe is detachably connected to the outlet connecting pipe.

[0023] The utility model also provides a battery pack, which comprises the electric core module as described above or the battery module as described above.

[0024] The cell module, battery module, and battery pack provided by this utility model feature liquid cooling plates located on both sides of the cell module, which effectively increase the heat exchange area and improve the heat exchange effect. The presence of fins further increases the contact area between the heat exchange wall and the coolant in the coolant flow channel, thereby further improving the heat exchange effect and contributing to improved battery performance. Furthermore, the liquid cooling plates located on the sides of the cell module do not occupy the bottom space of the battery box, improving space utilization. Moreover, since the liquid cooling plates are separate from the battery box rather than integrated into it, when the liquid cooling seal of a single liquid cooling plate fails, only targeted repair and replacement are needed, without having to remove all internal components and replace the entire battery box, thus improving the convenience of battery maintenance. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Fig. 1 This is a schematic diagram of the battery module provided in an embodiment of the present invention.

[0027] Fig. 2 This is one of the structural schematic diagrams of the battery cell module provided in this embodiment of the utility model.

[0028] Fig. 3 This is the second structural schematic diagram of the battery cell module provided in this embodiment of the utility model.

[0029] Figure label:

[0030] 10. Module body; 11. Liquid cooling plate; 110. Heat exchange wall; 111. Fins; 112. Mounting groove; 12. Thermal pad; 13. Heating device; 20. Liquid inlet system; 200. Liquid inlet main pipe; 201. Liquid inlet branch pipe; 202. Liquid inlet connecting pipe; 21. Liquid outlet system; 210. Manifold; 211. Liquid outlet branch pipe. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] In order to better understand the battery module, the battery module and the battery pack provided by the utility model embodiment, first introduce its application background, the temperature of the battery system directly affects the speed of charging, so the water cooling system needs to cool the battery system, so as to realize the large current charging of the battery.

[0033] In the related art, for the square cell, the most widely used scheme at present is to integrate the water cooling plate at the bottom of the battery box, the lower mounting surface of the cell is tightly attached to the water cooling plate for heat exchange, and the purpose of heat dissipation for the battery system is realized.

[0034] However, limited by the area of the lower mounting surface of the cell, the heat exchange between the cell and the liquid cooling plate cannot be fully carried out to take away the heat of the cell, so that the best heat dissipation effect is difficult to achieve, how to further improve the heat dissipation effect and improve the performance of the lithium battery has become an important problem to be solved at present.

[0035] In view of the above problems, the utility model provides a kind of cell module, battery module and battery pack, can further increase heat exchange area, improve heat exchange effect, and then improve the performance of battery.

[0036] Before describing the battery module, the battery module and the battery pack provided by the utility model embodiment, first introduce the structure of the battery pack, the battery pack is the important component in electric vehicle, energy storage system and other equipment, for providing the required electric energy for these devices.The typical structure of battery pack can be divided into several levels: cell monomer, cell module, battery module, and related management system and auxiliary structure. Among them, the cell monomer is the smallest unit of the battery pack, and a plurality of cell monomers are arranged in parallel to form a cell module, and a plurality of cell modules are arranged side by side to form a battery module.

[0037] The utility model provides a kind of cell module, battery module and battery pack. Figs. 1-3 The utility model provides a kind of cell module, battery module and battery pack.

[0038] Referring to Figs. 1 to 3 A kind of cell module, including module body 10 and liquid cooling plate 11;Wherein, module body 10 includes the plurality of cell monomers arranged in parallel;Liquid cooling plate 11 is set to the opposite two sides of module body 10;Liquid cooling plate 11 includes outer wall and the cooling liquid flow channel enclosed between outer wall, the outer wall of one side of liquid cooling plate 11 is used to and the side surface of module body 10 cooperates to form heat exchange wall 110, the outer side surface of heat exchange wall 110 is attached to the side surface of module body 10, and fin 111 is provided on the inner side surface.

[0039] In actual application, a plurality of the above-mentioned battery cell modules are arranged side by side to form a battery module, and the liquid cooling plate 11 is located between the module bodies 10 of every two adjacent battery cell modules. Compared with the bottom area of each battery cell module, the side area of each battery cell module is obviously larger. Therefore, the bottom area of the battery module formed by the plurality of battery cell modules is obviously smaller than the sum of the side areas of the plurality of battery cell modules, so that the heat exchange area of the battery module and the liquid cooling plate 11 is effectively increased, and the heat exchange effect is improved. The existence of the fins 111 can increase the contact area of the heat exchange wall 110 and the cooling liquid in the cooling liquid flow channel, so that the heat exchange effect is further improved, and the performance of the battery is further improved.

[0040] In addition, the liquid cooling plate 11 arranged at the side of the battery cell module does not occupy the bottom space of the battery box, so that the space utilization is improved. Moreover, the liquid cooling plate 11 is separated from the battery box instead of being integrated on the battery box. When the liquid cooling seal of a single liquid cooling plate 11 fails, only the liquid cooling plate 11 needs to be repaired and replaced, and the battery box does not need to be disassembled and replaced, so that the convenience of battery maintenance is improved.

[0041] In an embodiment of the utility model, each battery cell is a square structure, and a plurality of battery cells are arranged in parallel along the longitudinal direction, so as to form a square module body 10. The shape of the liquid cooling plate 11 is matched with the shape of the side of the module body 10, and two liquid cooling plates 11 are arranged on the two sides of the module body 10 and used for heat exchange with the battery cells. The specific size of the liquid cooling plate 11 can be designed flexibly based on the size of the battery cell module, and is not limited in the embodiment of the utility model.

[0042] In order to ensure good heat exchange efficiency, the liquid cooling plate 11 can be made of metal or alloy materials with good thermal conductivity, such as aluminum or aluminum alloy. In addition, in order to ensure good insulation and structural stability, the outer surface of the liquid cooling plate 11 can be coated with insulating paint.

[0043] In some optional embodiments, based on different actual needs, the cooling liquid flow channel in the liquid cooling plate 11 can be arranged in a serpentine or mesh structure to meet different heat dissipation needs.

[0044] In order to achieve better heat exchange efficiency, in an embodiment of the utility model, the liquid cooling plate 11 is provided as a hollow structure, so that the inner cavity of the liquid cooling plate 11 forms the above-mentioned cooling liquid flow channel, and the fins 111 are arranged on the inner side of the heat exchange wall 110 to increase the contact area. In this way, a larger heat exchange area can be provided, and during heat exchange, the cooling liquid can fill the entire inner cavity of the liquid cooling plate 11, so that the cooling liquid can achieve more sufficient and uniform heat exchange with the battery cell modules at various positions, thereby improving the heat exchange effect.

[0045] The specific shape and forming mode of the fins 111 can be set according to actual needs, and are not specifically limited in the embodiments of the present application.

[0046] In an embodiment of the present application, a flexible heat-conducting pad 12 is arranged between the outer side of the heat exchange wall 110 and the side of the module body 10. In this way, the flexible heat-conducting pad 12 can fill the small gap between the liquid cooling plate 11 and the module body 10, realize the close contact of the liquid cooling plate 11, the heat-conducting pad 12 and the side of the module body 10, and improve the heat-conducting efficiency. In addition, the heat-conducting pad 12 can also play the role of insulation and buffering.

[0047] According to different application scenarios and technical requirements, the heat-conducting pad 12 has multiple types and materials to choose from, for example, a silica gel-based heat-conducting pad, a non-silica gel-based heat-conducting pad, etc. The embodiments of the present application do not make specific limitations.

[0048] In an embodiment of the present application, one end of the liquid cooling plate 11 is provided with an inlet, and the inlet positions on the liquid cooling plates 11 located on both sides of the module body 10 correspond to each other. In this way, the cooling liquid can be conveniently distributed to different liquid cooling plates 11.

[0049] In an embodiment of the present application, the other end of the liquid cooling plate 11 is provided with an outlet, and the outlet positions on the liquid cooling plates 11 located on both sides of the module body 10 correspond to each other. In this way, the cooling liquid in different liquid cooling plates 11 can be conveniently collected and discharged.

[0050] In an embodiment of the present application, the battery cell module further comprises a heating device 13 connected to the liquid cooling plate 11. In actual work, the battery may face an extremely low temperature environment, in which case the performance of the battery will decrease significantly, and even the battery may not be able to start or charge normally. By integrating the heating device 13 on the liquid cooling plate 11, the battery cell module can be heated by the cooling liquid in reverse. The liquid cooling plate 11 located on the side of the module body 10 can increase the heat exchange area, and the fins 111 located on the heat exchange wall 110 can increase the contact area between the cooling liquid and the heat exchange wall 110, so that the heat transfer is more uniform, the battery cell module is heated fully and uniformly, and the working performance of the battery is ensured.

[0051] The specific form, arrangement position and connection mode of the heating device 13 with the liquid cooling plate 11 can be selected according to actual needs.

[0052] In an embodiment of the present application, the heating device 13 adopts a PTC heating strip, and the PTC heating strip is arranged along the length direction of the module body 10. By using the PTC heating strip, different parts of the module body 10 can be heated at the same time, which is conducive to further improving the uniformity of heat transfer.

[0053] In one embodiment of the utility model, the liquid cooling plate 11 is provided with a mounting groove 112 extending along the length direction on the outer wall of the other side of the module body 10, and the PTC heating strip is embedded in the mounting groove 112. Through the mounting groove 112, the positioning and installation of the PTC heating strip can be facilitated.

[0054] It can be understood that the heating device 13 includes but is not limited to the structures, forms and connection modes listed above, and other structures or forms and other ways of connecting the heating device 13 with the liquid cooling plate 11 are also applicable as long as the heating of the module body 10 can be realized.

[0055] The battery module provided by the utility model is described below, and the battery module described below can be correspondingly referred to the cell module described above.

[0056] Referring to Fig. 1 A battery module comprises a plurality of groups of the cell module provided by any of the embodiments described above arranged side by side, and the liquid cooling plate 11 is located between the module bodies 10 of adjacent cell modules.

[0057] It can be understood that each cell module can have its own liquid cooling plate 11 in the battery module, that is, the two sides of each cell module are provided with the liquid cooling plate 11, or adjacent cell modules can share a liquid cooling plate 11, and the specific selection can be made according to the actual demand.

[0058] In this embodiment, in order to ensure the heat exchange efficiency, each battery module has its own liquid cooling plate 11.

[0059] Generally, in order to realize the fixation of the cell monomer and the connection between different cell modules, end plates are generally arranged at both ends of the battery module, so that the two ends of the liquid cooling plate 11 can be fixedly connected with the end plates at both ends of the battery module, for example, connected by bolts and other connecting members, so as to conveniently realize the connection and fixation of the liquid cooling plate 11 in the battery module.

[0060] In one embodiment of the utility model, the battery module further comprises a liquid inlet system 20 and a liquid outlet system 21; wherein the liquid inlet system 20 comprises a liquid inlet main pipe 200 and a liquid inlet branch pipe 201; wherein the liquid inlet main pipe 200 is connected with the liquid inlets of the plurality of liquid cooling plates 11 through the plurality of liquid inlet branch pipes 201, and during operation, the cooling liquid can be distributed to different liquid cooling plates 11 through the liquid inlet main pipe 200 and the plurality of liquid inlet branch pipes 201, which is beneficial to improve the uniformity of heat exchange. The liquid outlet system 21 comprises a collecting pipe 210 and a plurality of liquid outlet branch pipes 211, and the collecting pipe 210 is connected with the liquid outlets of the plurality of liquid cooling plates 11 through the plurality of liquid outlet branch pipes 211, and during operation, the cooling liquid can be discharged through the plurality of liquid outlet branch pipes 211 and the collecting pipe 210.

[0061] Through the technical scheme, the liquid cooling plates 11 can be connected in any number and then connected to the total inlet and outlet of the battery pack, and the pipeline arrangement space is saved.

[0062] In one embodiment of the utility model, in each battery cell module, the liquid inlet on the liquid cooling plate 11 at both sides of the module body 10 is connected through the liquid inlet connecting pipe 202, and the liquid inlet connecting pipe 202 is detachably connected with the liquid inlet branch pipe 201.

[0063] Specifically, the liquid inlet main pipe 200 is arranged along the arrangement direction of the plurality of battery cell modules, one end of the liquid inlet branch pipe 201 is connected with the liquid inlet main pipe 200, and the other end is connected with the liquid inlet connecting pipe 202 through the quick-change joint.

[0064] In one embodiment of the utility model, in each battery cell module, the liquid outlet on the liquid cooling plate 11 at both sides of the module body 10 is connected through the liquid outlet connecting pipe, and the liquid outlet connecting pipe is detachably connected with the liquid outlet branch pipe 211.

[0065] Specifically, the liquid outlet branch pipe 211 is arranged along the arrangement direction of the plurality of battery cell modules, one end of the liquid outlet branch pipe 211 is connected with the liquid outlet main pipe 210, and the other end is connected with the liquid outlet connecting pipe through the quick-change joint.

[0066] Through the technical scheme, after the battery cell modules form the battery module, the number of the battery cell modules can be adaptively increased or decreased according to actual requirements to adjust the capacity of the battery system.

[0067] In another aspect, the utility model also provides a battery pack, which comprises the battery cell module provided in any of the above embodiments or the battery module provided in any of the above embodiments.

[0068] It can be understood that, without mutual contradiction, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples.

[0069] Through the battery cell module, the battery module and the battery pack provided in the embodiments of the utility model, the heat exchange area of the battery module and the liquid cooling plate 11 is effectively increased, the heat exchange effect is improved, the contact area of the heat exchange wall 110 and the cooling liquid in the cooling liquid flow channel is increased by the existence of the fin 111, and the heat exchange effect is further improved, which is beneficial to further improve the performance of the battery. In addition, the liquid cooling plate 11 arranged at the side of the battery cell module does not occupy the bottom space of the battery box, the space utilization rate is improved, and the liquid cooling plate 11 is separated from the battery box instead of being integrated on the battery box. When the liquid cooling sealing of a single liquid cooling plate 11 fails, targeted maintenance and replacement can be carried out, and all installation parts in the battery do not need to be removed and the battery box is replaced, so that the convenience of battery maintenance is improved.

[0070] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell module, characterized in that, include: The module body (10) includes multiple battery cells arranged in parallel. Liquid cooling plates (11) are disposed on opposite sides of the module body (10); the liquid cooling plates (11) include an outer wall and a cooling liquid flow channel formed between the outer walls, one side of the outer wall is used to cooperate with the side of the module body (10) to form a heat exchange wall (110), the outer side of the heat exchange wall (110) is attached to the side of the module body (10), and fins (111) are provided on the inner side.

2. The battery cell module according to claim 1, characterized in that, The liquid cooling plate (11) has an internal hollow structure, and the fins (111) are fully distributed on the inner side of the heat exchange wall (110).

3. The battery cell module according to claim 1, characterized in that, One end of the liquid cooling plate (11) is provided with a liquid inlet, and the liquid inlets on the liquid cooling plates (11) located on both sides of the module body (10) are corresponding to each other; And / or, the other end of the liquid cooling plate (11) is provided with a liquid outlet, and the positions of the liquid outlets on the liquid cooling plates (11) located on both sides of the module body (10) correspond.

4. The battery cell module according to claim 1, characterized in that, A flexible thermally conductive pad (12) is provided between the heat exchange wall (110) and the side of the module body (10).

5. The battery cell module according to any one of claims 1-4, characterized in that, It also includes a heating device (13) connected to the outer wall of the liquid cooling plate (11).

6. The cell module according to claim 5, characterized in that, The heating device (13) includes a PTC heating strip, which is arranged along the length of the module body (10).

7. A battery module, characterized in that, Includes: multiple sets of battery cell modules arranged side by side as described in any one of claims 1-6, wherein the liquid cooling plate (11) of the battery cell module is located between the module bodies (10) of adjacent battery cell modules.

8. The battery module according to claim 7, characterized in that, It also includes an inlet system (20) and / or an outlet system (21); The liquid inlet system (20) includes a main liquid inlet pipe (200) and branch liquid inlet pipes (201); the main liquid inlet pipe (200) is connected to the liquid inlets of multiple liquid cooling plates (11) through multiple branch liquid inlet pipes (201); The liquid outlet system (21) includes a manifold (210) and liquid outlet branch pipes (211); the manifold (210) is connected to the liquid outlets of multiple liquid cooling plates (11) through multiple liquid outlet branch pipes (211).

9. The battery module according to claim 8, characterized in that, The liquid inlets on the liquid cooling plates (11) located on both sides of the module body (10) are connected by liquid inlet connecting pipes (202), and the liquid inlet branch pipes (201) are detachably connected to the liquid inlet connecting pipes (202); And / or, the liquid outlets on the liquid cooling plates (11) located on both sides of the module body (10) are connected by liquid outlet connecting pipes, and the liquid outlet branch pipe (211) is detachably connected to the liquid outlet connecting pipe.

10. A battery pack, characterized in that, This includes the cell module as described in any one of claims 1-6 or the battery module as described in any one of claims 7-9.

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