Liquid-cooled battery pack

Abstract

The utility model provides a liquid-cooled battery pack. The liquid-cooled battery pack comprises a plurality of battery cells, a plurality of liquid cooling plates; the plurality of battery cells and the plurality of liquid cooling plates are accommodated in an accommodating space enclosed by the box body; at least one battery cell is clamped between the two liquid cooling plates; the liquid cooling device comprises a liquid cooling plate and a limiting rod, the liquid cooling plate is provided with a limiting surface, the limiting rod is provided with a limiting abutting part, and the limiting abutting part abuts against the limiting surface to limit the liquid cooling plate to move upwards. According to the battery pack disclosed by the utility model, the limiting part is arranged in each liquid cooling plate, meanwhile, the limiting rod is also arranged in the battery pack, and the limiting rod is matched with the limiting part and limits the liquid cooling plate to generate peristaltic displacement in the height direction, so that the stability of the liquid cooling plate in the battery pack is enhanced, and the cooling efficiency of the liquid cooling plate on a battery is improved; and the overall performance of the battery pack is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium-ion batteries, and in particular to a liquid-cooled battery pack. Background Art

[0002] The power system of electric vehicles mainly uses power batteries as the power source. Most power batteries are lithium-ion power batteries. By assembling multiple lithium batteries into a battery pack, as much electric energy as possible can be stored to enable electric vehicles to achieve indicators such as high cruising range, high charging speed, and high power performance. Among them, in order to ensure the safety and high cruising range of electric vehicles, effective battery thermal management must be carried out to avoid accidents such as power battery short circuit and fire during the charging and discharging state or operation of the lithium battery or due to excessive temperature. In the existing technology, the battery is often thermally managed by liquid cooling, that is, the heat exchange is mainly carried out by the contact between the liquid cooling plate and the surface of the power battery.

[0003] However, due to the limitations of the lithium battery mechanism and manufacturing process, the battery will inevitably swell and deform as the charge and discharge cycle proceeds. In the battery pack, the liquid cooling plate that is arranged opposite to the lithium battery and dissipates heat and conducts heat to the surface of the lithium battery is easily affected by various factors such as the expansion and extrusion of the battery cell. It is easy to creep relative to the battery cell or the battery pack shell, resulting in misalignment between the liquid cooling plate and the battery cell, thereby affecting the thermal conduction efficiency between the battery cell and the liquid cooling plate. Especially in the CTP type structure, since the battery module link is removed and the battery cell is directly integrated into the battery pack, the creeping displacement of the liquid cooling plate has a more obvious effect on the liquid cooling effect between the battery cell and the liquid cooling plate. Therefore, in the CTP type battery pack, it is particularly important to limit the displacement and movement of the liquid cooling plate relative to the box. Utility Model Content

[0004] In order to provide a CTP battery pack that can prevent a liquid cooling plate from being displaced relative to a battery pack box, the utility model provides a battery pack with a liquid cooling plate, including: a liquid-cooled battery pack, including:

[0005] A plurality of battery cells; a plurality of liquid cooling plates; a box body, wherein the plurality of battery cells and the plurality of liquid cooling plates are accommodated in an accommodation space surrounded by the box body; at least one of the battery cells is sandwiched between two of the liquid cooling plates; and further comprising a limiting rod, wherein a limiting surface is arranged on the liquid cooling plate, and a limiting abutting portion is arranged on the limiting rod, wherein the limiting abutting portion abuts against the limiting surface to limit the upward movement of the liquid cooling plate.

[0006] Furthermore, a positioning hole is formed on the limiting rod, and the limiting rod can be detachably installed in the box body through the positioning hole.

[0007] Furthermore, the positioning hole passes through the limiting rod.

[0008] Furthermore, the limiting rod is formed into a substantially L-shape.

[0009] Furthermore, the limiting rod is made of aluminum.

[0010] Furthermore, the liquid cooling plate is configured to be opposite to a side surface of the battery cell having the largest area.

[0011] Furthermore, the limiting surfaces are arranged at two axial ends of the liquid cooling plate.

[0012] Furthermore, the limiting rod is configured in multiple numbers.

[0013] Furthermore, the limiting surface is configured as a plane.

[0014] Furthermore, a support plate is included, and the liquid cooling plate and the battery cell are arranged on the support plate.

[0015] A limiting portion is provided in each liquid cooling plate in the battery pack of the utility model, and a limiting rod is also provided in the battery pack. The limiting rod cooperates with the limiting portion and limits the creeping displacement of the liquid cooling plate in the vertical direction, thereby enhancing the stability of the liquid cooling plate in the battery pack, improving the cooling efficiency of the liquid cooling plate for the battery, and improving the overall performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a battery pack of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the liquid cooling plate in the battery pack of the utility model;

[0018] Figure 3 It is a schematic diagram of a limit rod in a battery pack of the utility model;

[0019] Figure 4 It is a partial schematic diagram of the limit rod in the battery pack of the utility model;

[0020] Figure 5 It is a cross-sectional view of a limit rod in the battery pack of the utility model;

[0021] Figure 6 It is a schematic diagram of the connection between the limit rod and the liquid cooling plate in the battery pack of the utility model. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0023] like Figure 1As shown, the battery pack of the utility model is constructed as a CTP structure, and multiple battery cells 30 are directly installed in the battery box 10. The battery pack of the utility model includes multiple battery cells 30 and multiple liquid cooling plates 40. A battery cell 30 is sandwiched between any two liquid cooling plates 40. The liquid cooling plate 40 is opposite to the side with the largest area of ​​the battery cell 30, thereby increasing the heat conduction efficiency of the liquid cooling plate 40 to the battery cell 30, improving the liquid cooling effect of the liquid cooling plate, and thus improving the service life of the battery cell. The battery pack of the utility model has a box 10 arranged along the circumference of the battery pack and a support plate 60 arranged at the bottom of the box. Multiple battery cells 30 and multiple liquid cooling plates 40 are stacked on the support plate 60 in sequence and are located as a whole in the internal space surrounded by the box 10. In order to improve the overall strength of the battery pack, the battery pack of the utility model is also provided with a crossbeam 50 in the battery pack. The crossbeam 50 is connected between the left and right ends of the box 10, which strengthens the overall strength of the box 10, can prevent the box from being too large and deformed, and improve the overall strength of the box. The liquid cooling plate 40 is constructed as follows Figure 2 As shown, the overall structure is rectangular, including a liquid inlet 403 and a liquid outlet 404. The coolant enters the pipe inside the liquid cooling plate from the liquid inlet 403 and flows out of the liquid cooling plate through the liquid outlet 404. A first limiting portion 401 and a second limiting portion 402 are respectively provided at the left and right ends of the liquid cooling plate 40. The second limiting portion 402 is provided on the same side of the liquid inlet 403 and the liquid outlet 404, and the first limiting portion 401 is provided on the opposite side of the second limiting portion 402. The heights of the first limiting portion 401 and the second limiting portion 402 can be constructed to be different, but the heights of the first limiting portion 401 and the second limiting portion 402 are less than the overall height of the liquid cooling plate, so that they can abut against the limiting rod 20 to limit the movement of the liquid cooling plate in the vertical direction. In the present embodiment, the height H1 of the first limit portion 401 is preferably 50 mm, and the height H2 of the second limit portion 402 is preferably 40 mm. Of course, the heights H1 and H2 of the first limit portion can be designed to be different according to the actual size or shape of the battery pack, as long as they can play a role in limiting the liquid cooling plate. In the battery pack of the utility model, since the liquid cooling plate is constructed as a long rectangle, during long-term operation, the extrusion of the charging and discharging cycle of the battery cell 30 causes deformation and creep displacement of the liquid cooling plate, which is further amplified when the vehicle is driving. In order to limit the movement of the liquid cooling plate 40 in the height direction, the battery pack in the present embodiment is also provided with a limit rod 20. The shape of the limit rod 20 is roughly as shown in 3, and is respectively located on both sides of the axial direction of the liquid cooling plate. In the present embodiment, four limit rods 20 are formed, and two are respectively provided on the left and right sides of the box body 10, and the two limit rods 20 on the same side are separated by a crossbeam 50. The limit rod 20 is constructed to be roughly rod-shaped and formed into a roughly L-shape, such as Figure 4As shown, the limiting rod 20 includes a limiting abutment portion 202, a supporting portion 203 and a connecting portion 201. The connecting portion 201 is constructed as an internal threaded hole that is larger at the top and smaller at the bottom, or a through hole with steps. The internal threaded hole runs through the entire height of the limiting rod 20. The limiting abutment portion 202 is higher than the supporting portion 203. The supporting portion 203 abuts against the box body 10. The connecting portion 201 is formed in the supporting portion 203. A plurality of connecting portions 201 may be formed, which are evenly spaced and distributed in the overall length direction of the limiting rod.

[0024] The following will be combined with the attached Figure 1-6 The following describes in detail how the liquid cooling plate 40, the limiting rod 10 and the box body 10 in the battery pack of the present invention are connected and how the function of limiting the liquid cooling plate is achieved.

[0025] The liquid cooling plate 40 is placed on the support plate 60, the limiting rod 20 is placed on the box 10, the limiting abutting portion 202 in the limiting rod 20 abuts against the first limiting portion 401 in the liquid cooling plate 40, the connecting portion 201 in the limiting rod 20 is opposite to the positioning hole 101 in the box 10, and then the fastener (not shown) is inserted into the connecting portion 201 and enters the positioning hole 101 in the box, so that the limiting rod 20 is fixed to the box 10. At the same time, the limiting rod 20 applies a downward force to the liquid cooling plate 40, so that the liquid cooling plate 40 is supported by the support plate 60 and the first limiting portion 401 in the box 10. The limit rod 20 can prevent the liquid cooling plate from moving in the vertical direction during the operation of the battery pack, and can also limit the creep displacement of the liquid cooling plate; in this embodiment, in order to better limit the creep displacement of the liquid cooling plate 40 in the vertical direction, a second limit rod is also provided on the other side of the liquid cooling plate 40, and the structure of the second limit rod 20 is basically the same as the first limit rod 20 in limiting the liquid cooling plate, so that the liquid cooling plate can be simultaneously limited by the limit rod 20 in the up and down directions on both sides, which can better prevent the liquid cooling plate from creeping in the vertical direction. In this embodiment, the limit rod 20 is preferably made of metal material, preferably aluminum, which is light in weight and can reduce the overall weight of the battery pack, thereby improving the overall energy density of the battery pack. Moreover, the limit rod is constructed of aluminum, and a positioning hole 101 can be easily formed on the limit rod, so as to facilitate the installation of the fastener in the positioning hole, simplifying the installation process of the limit rod. At the same time, in order to stably fix the limit rod in the box, the positioning hole in the limit rod is preferably constructed as a plurality of positioning holes.

[0026] A limiting portion is provided in each liquid cooling plate in the battery pack of the utility model, and a limiting rod is also provided in the battery pack. The limiting rod cooperates with the limiting portion and limits the creeping displacement of the liquid cooling plate in the vertical direction. By innovatively designing the structure of the liquid cooling plate and adding a limiting rod, the stability of the liquid cooling plate in the battery pack is greatly enhanced, the cooling efficiency of the liquid cooling plate for the battery is improved, and the overall performance of the battery pack is improved.

[0027] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention.

[0028] It is not a limitation of the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A liquid-cooled battery pack, comprising: Multiple cells; Multiple liquid cooling plates; A box body, wherein the plurality of battery cells and the plurality of liquid cooling plates are accommodated in an accommodation space surrounded by the box body; At least one of the battery cells is sandwiched between the two liquid cooling plates; It is characterized in that it also includes a limiting rod, a limiting surface is arranged on the liquid cooling plate, a limiting abutment portion is arranged on the limiting rod, and the limiting abutment portion abuts against the limiting surface to limit the upward movement of the liquid cooling plate.

2. The liquid-cooled battery pack according to claim 1, characterized in that: A positioning hole is formed on the limiting rod, and the limiting rod can be detachably installed in the box body through the positioning hole.

3. The liquid-cooled battery pack according to claim 2, characterized in that: The positioning hole passes through the limiting rod.

4. The liquid-cooled battery pack according to claim 1, characterized in that: The limiting rod is formed in a substantially L-shape.

5. The liquid-cooled battery pack according to claim 1, characterized in that: The limiting rod is made of aluminum.

6. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid cooling plate is configured to be opposite to a side surface of the battery cell having the largest area.

7. The liquid-cooled battery pack according to claim 1, characterized in that: The limiting surfaces are arranged at two axial ends of the liquid cooling plate.

8. The liquid-cooled battery pack according to claim 1, characterized in that: The limiting rod is configured in multiple numbers.

9. The liquid-cooled battery pack according to claim 1, characterized in that: The limiting surface is configured as a plane.

10. The liquid-cooled battery pack according to claim 1, characterized in that: It also includes a support plate, and the liquid cooling plate and the battery core are arranged on the support plate.

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