Battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack. The battery pack comprises a battery module, a liquid cooling plate and a heat pipe, wherein the liquid cooling plate is arranged at the bottom of the battery module, a plurality of heat pipes are arranged on the two opposite side faces of the battery module in the width direction, and the condensation end of each heat pipe is attached to the liquid cooling plate so that heat in the heat pipes can be taken away through the liquid cooling plate. The battery pack adopts a heat dissipation scheme of the bottom liquid cooling plate and the side heat pipes, so that the heat dissipation effect is ensured, the structure and the control difficulty are simplified, the overall cost of the battery pack is reduced, the space utilization rate in the battery pack is improved, and the risk of coolant leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pack. BACKGROUND

[0002] The traditional battery pack heat dissipation mode is generally that a liquid cooling plate is arranged at the bottom of the battery pack, and the temperature of the battery cell is taken away by the cooling liquid in the liquid cooling plate flow channel to control the temperature of the battery cell within the working temperature range. However, with the continuous increase of the battery cell capacity, the self-heating amount of the battery cell in the working process also continuously increases, so that the bottom liquid cooling plate heat dissipation alone cannot meet the heat dissipation demand of the battery pack. In order to avoid the battery pack temperature being too high to cause thermal runaway and serious safety hazards, some battery packs increase the side liquid cooling plate on the side surface. However, this heat dissipation scheme has the following defects:

[0003] (1) More space is needed to install the side liquid cooling plate, which leads to low space utilization rate in the battery pack and limits the space of other components;

[0004] (2) The bottom liquid cooling plate and the side liquid cooling plate need to be connected through a pipeline, and the pipeline connection position is prone to cooling liquid leakage, which affects the performance and safety of the battery pack;

[0005] (3) More materials and more complex manufacturing processes are needed, so that the overall cost of the battery pack is high;

[0006] (4) The combination of the bottom liquid cooling plate and the side liquid cooling plate makes the thermal management system of the battery pack more complex, and the flow direction and flow rate of the cooling liquid need to be accurately designed and controlled to ensure the uniformity of the internal temperature of the battery pack.

[0007] Therefore, it is urgent to provide a battery pack to solve the above technical problems. UTILITY MODEL CONTENTS

[0008] The utility model provides a battery pack, adopts the heat dissipation scheme of bottom liquid cooling plate plus side heat pipe, guarantees the heat dissipation effect, simplifies the structure and control difficulty, reduces the overall cost of the battery pack, improves the space utilization rate in the battery pack, and avoids the risk of cooling liquid leakage.

[0009] To achieve this purpose, the utility model adopts the following technical scheme:

[0010] The battery pack comprises a battery module, a liquid cooling plate and a heat pipe, the liquid cooling plate is arranged at the bottom of the battery module, opposite two side surfaces of the battery module in the width direction are each provided with a plurality of heat pipes, and the condensation end of each heat pipe is attached to the liquid cooling plate to take away the heat in the heat pipe through the liquid cooling plate.

[0011] Optionally, the battery module comprises an electric core group and heat-conducting plates arranged on opposite sides of the electric core group in the width direction of the electric core group, the heat-conducting plates are provided with clamping grooves on plate surfaces facing away from the electric core group, and the clamping grooves are used for fixing the heat pipes.

[0012] Optionally, the electric core group and the heat-conducting plates are fixed together through a binding belt.

[0013] Optionally, a plurality of heat pipes are arranged on opposite sides of the battery module in the width direction of the battery module, the plurality of heat pipes are arranged in parallel and at intervals in the height direction of the battery module, the condensing end of each heat pipe is bent to form a condensing section, and the condensing section is attached to the liquid cooling plate.

[0014] Optionally, one heat pipe is arranged on each of opposite sides of the battery module in the width direction of the battery module, the heat pipe is in a serpentine shape, the condensing end of the heat pipe is bent to form a condensing section, and the condensing section is attached to the liquid cooling plate.

[0015] Optionally, the condensing end of the heat pipe is attached to the liquid cooling plate through heat-conducting glue.

[0016] Optionally, the condensing end of the heat pipe is close to a water outlet of the liquid cooling plate.

[0017] Optionally, the top of the battery module is also provided with a plurality of heat pipes, and the condensing end of the heat pipe on the top of the battery module is also attached to the liquid cooling plate.

[0018] Optionally, on one side of the battery module in the length direction of the battery module, a load plug-in panel is arranged on the liquid cooling plate, the load plug-in panel is arranged in a spaced manner with the battery module, and the condensing end of the heat pipe is located between the load plug-in panel and the battery module.

[0019] Optionally, a plurality of battery modules are arranged on the liquid cooling plate.

[0020] A plurality of heat pipes are arranged on each of two sides of each of the adjacent two battery modules, the plurality of heat pipes on the two sides are arranged in a staggered manner; or a plurality of heat pipes are arranged on one of the two sides of each of the adjacent two battery modules.

[0021] The utility model discloses beneficial effects:

[0022] The utility model provides a kind of battery pack, including battery module, liquid cooling plate and heat pipe.Liquid cooling plate is arranged at the bottom of battery module, cooling liquid flowing inside liquid cooling plate can take away the heat of the bottom of battery module, heat pipe is arranged at the both sides of the width direction of battery module, so that the contact area of heat pipe and battery module is as large as possible, to take away the heat of the upper part of the bottom of battery module.That is, by the combination of liquid cooling plate and heat pipe, the heat dissipation effect of battery pack can be improved, to ensure that the battery cell in battery module can maintain working temperature, reduce the risk of battery pack thermal runaway.

[0023] And, heat pipe is used to replace the side liquid cooling plate in prior art, on the one hand, structure is simpler, and the space occupied is smaller, both improve the space utilization rate in battery pack, and reduce material and manufacturing cost;On the other hand, the condensing end of heat pipe is attached to liquid cooling plate, so that there is no mutual flow of cooling liquid between heat pipe and liquid cooling plate, which not only avoids the risk of cooling liquid leakage, improves the safety of battery pack, but also reduces the control difficulty of battery pack thermal management system. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the content of the embodiments of the utility model and these drawings without creative labor for those skilled in the art.

[0025] Figure 1 It is the structural schematic diagram of battery pack provided by the embodiments of the utility model;

[0026] Figure 2 It is Figure 1 The schematic diagram after hiding load plug-in panel;

[0027] Figure 3 It is the exploded schematic diagram of battery pack provided by the embodiments of the utility model;

[0028] Figure 4 It is the structural schematic diagram of heat conduction plate provided by the embodiments of the utility model.

[0029] In the figure:

[0030] 100, battery module;110, battery cell group;120, heat conduction plate;121, clamping groove;130, bandage;

[0031] 200, liquid cooling plate;210, water inlet;220, water outlet;

[0032] 300, heat pipe;310, condensing section;

[0033] 400, load plug-in panel. DETAILED DESCRIPTION

[0034] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0035] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of the embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0038] The embodiment provides a battery pack, adopts a heat dissipation scheme of a bottom liquid cooling plate plus a side heat pipe, guarantees heat dissipation effect, simplifies structure and control difficulty, reduces the overall cost of the battery pack, improves the space utilization rate in the battery pack, and avoids the risk of cooling liquid leakage.

[0039] Specifically, as Figures 1-3As shown, the battery pack includes a battery module 100, a liquid cooling plate 200 and a heat pipe 300. Among them, the liquid cooling plate 200 is arranged at the bottom of the battery module 100, and the opposite two side surfaces of the battery module 100 in the width direction are each provided with a plurality of heat pipes 300, and the condensation end of each heat pipe 300 is attached to the liquid cooling plate 200, so as to take away the heat in the heat pipe 300 through the liquid cooling plate 200.

[0040] In the embodiment, the width direction of the battery module 100 is the direction indicated by the X-axis in the figure, the length direction of the battery module 100 is the direction indicated by the Y-axis in the figure, and the height direction of the battery module 100 is the direction indicated by the Z-axis in the figure. Figure 1 In the embodiment, the width direction of the battery module 100 is the direction indicated by the X-axis in the figure, the length direction of the battery module 100 is the direction indicated by the Y-axis in the figure, and the height direction of the battery module 100 is the direction indicated by the Z-axis in the figure. Figure 1 In the embodiment, the width direction of the battery module 100 is the direction indicated by the X-axis in the figure, the length direction of the battery module 100 is the direction indicated by the Y-axis in the figure, and the height direction of the battery module 100 is the direction indicated by the Z-axis in the figure. Figure 1 In the embodiment, the width direction of the battery module 100 is the direction indicated by the X-axis in the figure, the length direction of the battery module 100 is the direction indicated by the Y-axis in the figure, and the height direction of the battery module 100 is the direction indicated by the Z-axis in the figure.

[0041] When the battery pack works, the cooling liquid flowing in the liquid cooling plate 200 can take away the heat at the bottom of the battery module 100. The heat pipe 300 can take away the heat at the position above the bottom of the battery module 100, and the heat pipe 300 is arranged at the two sides of the battery module 100 in the width direction, so that the contact area of the heat pipe 300 and the battery module 100 is as large as possible, and the heat dissipation effect is better. That is, compared with the prior art scheme of arranging only the bottom liquid cooling plate 200, the combination of the liquid cooling plate 200 and the heat pipe 300 reduces the temperature difference between the bottom and the top of the battery module 100, improves the heat dissipation effect of the battery pack, and makes the battery cell in the battery module 100 maintain the working temperature, thereby reducing the risk of thermal runaway of the battery pack. Compared with the prior art scheme of arranging the bottom liquid cooling plate and the side liquid cooling plate, the heat pipe 300 is used to replace the side liquid cooling plate in the embodiment. On the one hand, the heat pipe 300 has a simple structure and a small size, which improves the space utilization rate in the battery pack and reduces the material and manufacturing costs. On the other hand, the condensation end of the heat pipe 300 is attached to the liquid cooling plate 200, so that there is no mutual flow of the cooling liquid between the heat pipe 300 and the liquid cooling plate 200, which avoids the risk of cooling liquid leakage, improves the safety of the battery pack, and reduces the control difficulty of the heat pipe 300 system of the battery pack.

[0042] It is worth noting that the structure of the heat pipe 300 is a prior art, so the specific structure will not be described in detail.

[0043] Optionally, continuing to refer to Figures 1-3In a possible embodiment, a plurality of heat pipes 300 are arranged on opposite sides of the battery module 100 in the width direction of the battery module 100, and the plurality of heat pipes 300 are arranged in parallel and at intervals in the height direction of the battery module 100. The condensing end of each heat pipe 300 is bent to form a condensing section 310, and the condensing section 310 is attached to the liquid cooling plate 200. By arranging the plurality of heat pipes 300, the heat dissipation effect of the battery module 100 can be improved. By arranging the plurality of heat pipes 300 in parallel and at intervals in the height direction of the battery module 100, the uniformity of the temperature of each battery cell in the battery module 100 can be improved. By bending the condensing end to form the condensing section 310, the contact area between the heat pipe 300 and the liquid cooling plate 200 is large, the heat exchange capacity between the liquid cooling plate 200 and the heat pipe 300 is improved, and the heat dissipation performance of the heat pipe 300 is improved.

[0044] In the present embodiment, three heat pipes 300 are arranged on the side of the battery module 100.

[0045] Alternatively, in another possible embodiment, one heat pipe 300 can be arranged on each of the opposite sides of the battery module 100 in the width direction of the battery module 100. The heat pipe 300 is in a serpentine shape. The condensing end of the heat pipe 300 is bent to form a condensing section 310, and the condensing section 310 is attached to the liquid cooling plate 200. By arranging the heat pipe 300 in a serpentine shape, the contact area between the heat pipe 300 and the side of the battery module 100 can be increased, and the heat dissipation performance of the heat pipe 300 can be improved.

[0046] Of course, in other embodiments, the number and arrangement of the heat pipes 300 can be other arrangements, which can be arranged as needed, and the present application is not limited in this regard.

[0047] Further, the condensing end of the heat pipe 300 can be arranged close to the water outlet 220 of the liquid cooling plate 200. In this way, the heat in the condensing end can be directly removed by the liquid cooling plate 200, and the heat dissipation performance of the liquid cooling plate 200 for the battery module 100 can be improved.

[0048] As shown in Figure 1 and Figure 2 In the present embodiment, the water inlet 210 and the water outlet 220 of the liquid cooling plate 200 are arranged on one side of the liquid cooling plate in the length direction.

[0049] Alternatively, the condensing end of the heat pipe 300 can be attached to the liquid cooling plate 200 by means of a heat-conducting adhesive. The heat pipe 300 and the liquid cooling plate 200 are connected by means of the adhesive, which is simple in structure and easy to process. In addition, the heat-conducting adhesive has heat-conducting properties, which is conducive to heat transfer between the heat pipe 300 and the liquid cooling plate 200, and thus the heat dissipation efficiency of the heat pipe 300 is improved to some extent.

[0050] Further, referring to Figure 1 andFigure 2 On one side of the battery module 100 in the length direction, a load plug-in panel 400 is arranged on the liquid cooling plate 200, the load plug-in panel 400 is arranged in a spaced manner with the battery module 100, and the condensing end of the heat pipe 300 is located between the load plug-in panel 400 and the battery module 100. In this way, the load plug-in panel 400 plays a certain protective role for the heat pipe 300.

[0051] Optionally, continuing to refer to Figures 1-3 , the battery module 100 is provided in plurality, and the plurality of battery modules 100 are arranged on the liquid cooling plate 200. It can be understood that the number of battery modules 100 can be set according to the capacity required by the battery pack, and in the embodiment, the battery module 100 is provided in two.

[0052] Specifically, in one possible embodiment, a plurality of heat pipes 300 are arranged on each of the two sides of the adjacent two battery modules 100 close to each other, and the plurality of heat pipes 300 on the two sides close to each other are arranged in a staggered manner. In this way, while ensuring the heat dissipation effect, it is beneficial to save the space in the battery pack.

[0053] In another possible embodiment, a plurality of heat pipes 300 are arranged on one of the two sides of the adjacent two battery modules 100 close to each other. In this way, in the adjacent two battery modules 100, the two sides close to each other share the heat pipes 300, which can further reduce the space occupation.

[0054] Further, as shown in Figure 3 and Figure 4 , the battery module 100 includes a cell group 110 and a heat conduction plate 120 arranged on opposite sides of the cell group 110 in the width direction, the plate surface of the heat conduction plate 120 away from the cell group 110 is provided with a clamping groove 121 for fixing the heat pipe 300. The heat conduction plate 120 can not only protect the cell group 110, but also has heat conduction performance, which can improve the heat exchange effect between the cell group 110 and the heat pipe 300, and the heat pipe 300 is fixed on the heat conduction plate 120 by clamping, which is simple in structure and convenient to install.

[0055] Optionally, the material of the heat conduction plate 120 can be epoxy resin.

[0056] Optionally, continuing to refer to Figure 1 and Figure 2 , in the embodiment, the cell group 110 and the heat conduction plate 120 are fixed together by a binding belt 130. In this way, it is beneficial to reduce the overall size of the battery module 100 and improve the space utilization in the battery pack.

[0057] Optionally, two straps 130 can be provided, and the two straps 130 can be provided at opposite ends in the height direction of the battery module 100 to ensure the bundling effect on the battery cell group 110 and the heat conduction plate 120.

[0058] Further, one of the two straps 130 can be a steel strap, and the other can be a plastic strap.

[0059] Further, in a possible embodiment, a plurality of heat pipes 300 can also be provided on the top of the battery module 100, and the condensing end of the heat pipe 300 on the top of the battery module 100 is also attached to the liquid cooling plate 200. In this way, the uniformity of the temperature between the battery cells in the battery module 100 is further improved, which is beneficial to ensure the operation of the battery cells at the working temperature.

[0060] Optionally, the heat conduction plate 120 can also be provided on the top of the battery cell group 110, and the heat pipe 300 is clamped on the heat conduction plate 120.

[0061] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery pack, characterized by, The application relates to a battery module (100), a liquid cooling plate (200) and a heat pipe (300), wherein the liquid cooling plate (200) is arranged at the bottom of the battery module (100), opposite sides of the battery module (100) in the width direction are each provided with a plurality of heat pipes (300), and the condensation end of each heat pipe (300) is attached to the liquid cooling plate (200) to remove heat in the heat pipe (300) through the liquid cooling plate (200).

2. The battery pack of claim 1, wherein, The battery module (100) comprises a cell group (110) and a heat conduction plate (120) arranged at opposite sides of the cell group (110) in the width direction, the heat conduction plate (120) is provided with a clamping groove (121) on the plate surface away from the cell group (110), and the clamping groove (121) is used for fixing the heat pipe (300).

3. The battery pack of claim 2, wherein, The cell group (110) and the heat conduction plate (120) are fixed together through a binding belt (130).

4. The battery pack of claim 1, wherein, The opposite sides of the battery module (100) in the width direction are each provided with a plurality of heat pipes (300), the plurality of heat pipes (300) are arranged in parallel and at intervals along the height direction of the battery module (100), the condensation end of each heat pipe (300) is bent to form a condensation section (310), and the condensation section (310) is attached to the liquid cooling plate (200).

5. The battery pack of claim 1, wherein, The opposite sides of the battery module (100) in the width direction are each provided with one heat pipe (300), the heat pipe (300) is in a serpentine shape, the condensation end of the heat pipe (300) is bent to form a condensation section (310), and the condensation section (310) is attached to the liquid cooling plate (200).

6. The battery pack of claim 1, wherein, The condensation end of the heat pipe (300) is attached to the liquid cooling plate (200) through heat conduction glue.

7. The battery pack of claim 1, wherein, The condensation end of the heat pipe (300) is close to the water outlet (220) of the liquid cooling plate (200).

8. The battery pack of claim 1, wherein, The top of the battery module (100) is also provided with a plurality of heat pipes (300), and the condensation end of the heat pipe (300) at the top of the battery module (100) is also attached to the liquid cooling plate (200).

9. The battery pack of any one of claims 1-8, wherein, A load plug-in panel (400) is arranged on the liquid cooling plate (200) at one side of the battery module (100) in the length direction, the load plug-in panel (400) is arranged in a spaced mode with the battery module (100), and the condensation end of the heat pipe (300) is located between the load plug-in panel (400) and the battery module (100).

10. The battery pack of any one of claims 1-8, wherein, A plurality of battery modules (100) are arranged on the liquid cooling plate (200). A plurality of heat pipes (300) are arranged on two sides of each of two adjacent battery modules (100) that are close to each other, the plurality of heat pipes (300) on the two sides that are close to each other are arranged in a staggered mode; or a plurality of heat pipes (300) are arranged on one side of two adjacent battery modules (100) that are close to each other.

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