A battery pack

Abstract

A battery pack, which relates to the technical field of batteries, comprises a battery assembly and a water-cooling plate assembly. The battery assembly includes at least one battery cell, and the water-cooling plate assembly includes at least two water-cooling plates. The battery cells are fixedly bonded between two adjacent water-cooling plates by thermal glue. The water-cooling plates are designed with a hollow structure, and a heat transfer medium is filled inside. The left view and the right view of the water-cooling plate are both single V-shaped opening structures, and the front view and the rear view of the water-cooling plate are both double V-shaped opening structures. The two V-shaped structures are arranged side by side vertically, and one end where the two V-shaped structures meet forms a plane. A liquid inlet pipe is connected to the plane of the front view, and a liquid outlet pipe is connected to the plane of the rear view. The liquid inlet pipe and the liquid outlet pipe are respectively connected to a medium circulation cooling system. In the present invention, the heat of the battery is carried away by the circulating flow of the medium, so that the battery temperature can be controlled. At the same time, the V-shaped water-cooling plate can effectively avoid the extrusion deformation of the water-cooling plate caused by the volume deformation of the battery.

Description

Technical Field

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

[0002] During the charging and discharging process, as the electrons are transferred, chemical reactions and electrochemical reactions occur inside the battery. During this reaction, a large amount of heat is generated inside the battery. The accumulation of heat will seriously affect the service life of the battery. Therefore, quickly removing the heat generated by the battery becomes the most basic requirement for improving the battery life and ensuring the safety of the battery. At the same time, the battery thickness will change during the charging and discharging process. The irreversible deformation will cause the internal resistance of the battery to increase, resulting in increased heat generation and a series of safety problems. Therefore, a certain preload is required to ensure that the battery can be reversibly deformed within a reasonable range. Therefore, there are two inevitable problems in the use of the battery: battery temperature control and volume deformation control. In the prior art, the thermal management of the battery is considered separately from the volume deformation control, and these two problems cannot be solved at the same time. In addition, the thermal management currently used is usually air cooling and liquid cooling. The air cooling method has low cooling efficiency and high power consumption. The liquid cooling method is usually that the narrow surface of the battery contacts the water cooling plate, and the internal temperature of the battery cannot be effectively removed. Furthermore, the deformation control in the current battery grouping process is mainly achieved through elastic foam. Although the foam has a certain elasticity, it also has good thermal insulation properties, which results in the heat inside the battery cannot be quickly removed, which can easily cause thermal runaway of the battery.

[0003] Currently, there is no effective way to solve the problems of battery temperature rise and deformation at the same time. To address this problem, we have proposed a new battery pack that can control temperature and volume deformation.

[0004] Technical issues: Batteries face two unavoidable problems during the cycle: volume deformation and temperature rise. To solve these two problems, the traditional method is to use elastic foam and water cooling plate. Although elastic foam has good compressible deformation ability, its thermal conductivity is extremely poor and it cannot achieve the characteristic of controlling the temperature of the battery at the same time. The water cooling plate is usually in contact with one side of the battery and takes away the heat through heat exchange. The water cooling plate is usually a rigid structure without deformation ability. At present, there is no effective way to solve the problems of battery temperature rise and deformation at the same time. Summary of the invention

[0005] In view of the above shortcomings of the prior art, an object of the present invention is to provide a battery pack that can solve the problem that there is currently no effective way to simultaneously solve the problem of battery temperature increase and deformation.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A battery pack includes a battery assembly and a water-cooling plate assembly. The battery assembly includes at least one battery cell, and the water-cooling plate assembly includes at least two water-cooling plates. The battery cells are fixedly bonded between two adjacent water-cooling plates by thermal glue. The water-cooling plates are designed with a hollow structure, and a heat transfer medium is filled inside. The left view and the right view of the water-cooling plate are both of a single V-shaped opening structure, and the front view and the rear view of the water-cooling plate are both of a double V-shaped opening structure. The two V-shapes are arranged side by side vertically, and one end where the two V-shapes meet forms a plane. An inlet pipe is connected to the plane of the front view, and an outlet pipe is connected to the plane of the rear view. The inlet pipe and the outlet pipe are respectively connected to a medium circulation cooling system.

[0008] Preferably, the size of the water-cooling plate matches the size of the battery cell.

[0009] Preferably, the heat transfer medium is composed of one or more of pure water, ethylene glycol, and isopropyl alcohol mixed in different proportions.

[0010] Preferably, the inlet pipe includes an inlet main pipe and a plurality of inlet branch pipes connected to the inlet main pipe. One end of the inlet main pipe is closed, and the other end is connected to the medium circulation cooling system. The plurality of inlet branch pipes are respectively connected to the planes of the front views of a plurality of water-cooling plates;

[0011] The outlet pipe includes an outlet main pipe and a plurality of outlet branch pipes connected to the outlet main pipe. One end of the outlet main pipe is closed, and the other end is connected to the medium circulation cooling system. The plurality of outlet branch pipes are respectively connected to the planes of the rear views of a plurality of water-cooling plates.

[0012] Preferably, both the inlet main pipe and the outlet main pipe are circular pipes, and both the inlet branch pipes and the outlet branch pipes are rectangular pipes. The width of the rectangular pipe is consistent with the width of the plane.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. The water-cooling plate adopts a V-shaped reciprocating resilient hollow structure, which can effectively avoid the extrusion deformation of the water-cooling plate caused by the volume deformation of the battery, and enable the ordinary rigid structure water-cooling plate to have a deformation ability.

[0015] 2. The heat transfer medium in the water-cooling plate is selected from one or more of pure water, ethylene glycol, and isopropyl alcohol mixed in different proportions. This medium has strong heat transfer ability. Through the isolation of the water-cooling plate, it not only ensures the heat transfer ability of the cooling medium, avoids the corrosion of the battery, but also plays a good insulation role.

[0016] 3. Compared with the method of completely immersing the battery, this structural design can effectively reduce the system weight and relieve the load pressure on the bracket. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings.

[0018] Figure 1 Structural schematic diagram of a battery pack proposed by the present invention;

[0019] Figure 2 Front view of a water-cooling plate in a battery pack proposed by the present invention;

[0020] Figure 3 Left view of a water-cooling plate in a battery pack proposed by the present invention;

[0021] Figure 4 Structural schematic diagram of Embodiment 2 of a battery pack proposed by the present invention;

[0022] Figure 5 Structural schematic diagram of Embodiment 3 of a battery pack proposed by the present invention;

[0023] Figure 6 Structural schematic diagram of Embodiment 4 of a battery pack proposed by the present invention;

[0024] Figure 7 Structural schematic diagram of Embodiment 5 of a battery pack proposed by the present invention.

[0025] Explanation of reference numerals:

[0026] 1 - Battery cell, 2 - Water-cooling plate, 3 - Plane, 4 - Main liquid inlet pipe, 5 - Liquid inlet branch pipe, 6 - Main liquid outlet pipe, 7 - Liquid outlet branch pipe. Detailed implementation manners

[0027] The following will make a detailed description of the content of the present invention by way of examples in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0028] Embodiment 1

[0029] Such as Figures 1-3As shown in the figure, a battery pack includes a battery component and a water-cooled plate component. The battery component includes three battery cells 1, and the water-cooled plate component includes four water-cooled plates 2. The battery cells 1 are fixedly bonded between two adjacent water-cooled plates 2 by thermal glue. The size of the water-cooled plate 2 matches the size of the battery cell 1. The inside of the water-cooled plate 2 is hollow and filled with a heat transfer medium. The heat transfer medium is composed of one or more liquids such as pure water, ethylene glycol, and isopropyl alcohol mixed in different proportions. This medium has strong heat transfer ability. Through the isolation of the water-cooled plate 2, it not only ensures the heat transfer ability of the cooling medium, avoids corrosion of the battery, but also plays a good insulation role. The left view and the right view of the water-cooled plate 2 are both single V-shaped opening structures, and the front view and the rear view of the water-cooled plate 2 are both double V-shaped opening structures. The two V-shapes are arranged side by side up and down, and one end where the two V-shapes meet forms a plane 3. An inlet pipe is connected to the plane 3 of the front view, and an outlet pipe is connected to the plane 3 of the rear view. The inlet pipe and the outlet pipe are respectively connected to the medium circulation heat dissipation system.

[0030] In this embodiment, the battery cell 1 forms a heat transfer medium circulation cooling through the inlet pipe, the water-cooled plate 2, the outlet pipe, and the medium circulation heat dissipation system, reducing the temperature of the battery cell 1 and extending the service life of the battery cell 1. At the same time, the four sides of the water-cooled plate 2 adopt a V-shaped opening structure, and the V-shaped structure has the characteristic of reciprocating resilience, which can effectively avoid the extrusion deformation of the water-cooled plate 2 caused by the volume deformation of the battery, ensuring the safety performance of the battery cell 1.

[0031] The inlet pipe includes an inlet main pipe 4 and a plurality of inlet branch pipes 5 connected to the inlet main pipe 4. One end of the inlet main pipe 4 is closed, and the other end is connected to the medium circulation heat dissipation system. The plurality of inlet branch pipes 5 are respectively connected to the planes 3 of the front views of a plurality of water-cooled plates 2.

[0032] The outlet pipe includes an outlet main pipe 6 and a plurality of outlet branch pipes 7 connected to the outlet main pipe 6. One end of the outlet main pipe 6 is closed, and the other end is connected to the medium circulation heat dissipation system. The plurality of outlet branch pipes 7 are respectively connected to the planes 3 of the rear views of a plurality of water-cooled plates 2.

[0033] In this embodiment, the inlet pipe and the outlet pipe are respectively located on both sides of the water-cooled plate 2, thereby increasing the residence time of the medium in the water-cooled plate 2, increasing the degree of disorder of the medium in the water-cooled plate 2, ensuring the temperature balance of the medium in the water-cooled plate 2, effectively preventing the situation where the medium has local high temperature and affects the heat exchange with the battery, and effectively preventing the situation where the battery has local high temperature.

[0034] Both the inlet main pipe 4 and the outlet main pipe 6 adopt circular pipes, and both the inlet branch pipes 5 and the outlet branch pipes 7 adopt rectangular pipes. The width of the rectangular pipe is consistent with the width of the plane 3.

[0035] In this embodiment, a rectangular tube is adopted, and its width can minimize the proportion occupying the thickness direction of the water-cooling plate 2, fully improving the flow rate of the water-cooling plate 2 and increasing the efficiency of the medium circulation.

[0036] During specific use, the heat transfer medium is distributed from the main liquid inlet pipe 4 into each liquid inlet branch pipe 5, enters the water-cooling plate 2 connected thereto through the liquid inlet branch pipe 5. The water-cooling plate 2 and the battery cell 1 are tightly bonded together by means of thermal glue. The heat of the battery cell 1 is transferred to the water-cooling plate 2 through heat exchange. The heat transfer medium in the water-cooling plate 2 takes away the heat during the flowing process, is collected into the main liquid outlet pipe 6 through the liquid outlet branch pipe 7, and then flows into the medium circulation cooling system through the main liquid outlet pipe 6 for cooling. After cooling, it enters the main liquid inlet pipe 4 again to form a circulating cooling.

[0037] Embodiment 2

[0038] Same as Embodiment 1, the difference is that: as Figure 4 shown, the opening structure of the water-cooling plate is a U-shaped structure.

[0039] Embodiment 3

[0040] Same as Embodiment 1, the difference is that: as Figure 5 shown, the opening structure of the water-cooling plate is a semi-circular structure.

[0041] Embodiment 4

[0042] Same as Embodiment 1, the difference is that: as Figure 6 shown, the opening structure of the water-cooling plate is a W-shaped structure.

[0043] Embodiment 5

[0044] Same as Embodiment 1, the difference is that: as Figure 7 shown, the opening structure of the water-cooling plate is a T-shaped structure.

[0045] The above is only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and application concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A battery pack, comprising a battery assembly and a water-cooling plate assembly. The battery assembly includes at least one battery cell (1), and the water-cooling plate assembly includes at least two water-cooling plates (2). The battery cell (1) is fixedly bonded between two adjacent water-cooling plates (2) by thermal glue. The water-cooling plate (2) is designed with a hollow interior and filled with a heat transfer medium, characterized in that: The left view and the right view of the water cooling plate (2) are both single V-shaped opening structures, and the front view and the rear view of the water cooling plate (2) are both double V-shaped opening structures. The two V-shapes are arranged side by side vertically, and one end where the two V-shapes meet forms a plane (3). A liquid inlet pipe is connected to the plane (3) of the front view, and a liquid outlet pipe is connected to the plane (3) of the rear view. The liquid inlet pipe and the liquid outlet pipe are respectively connected to the medium circulation heat dissipation system; The liquid inlet pipe includes a liquid inlet main pipe (4) and a plurality of liquid inlet branch pipes (5) connected to and communicating with the liquid inlet main pipe (4). One end of the liquid inlet main pipe (4) is closed, and the other end is connected to the medium circulation heat dissipation system. The plurality of liquid inlet branch pipes (5) are respectively connected to the planes (3) of the front views of a plurality of water cooling plates (2); The liquid outlet pipe includes a liquid outlet main pipe (6) and a plurality of liquid outlet branch pipes (7) connected to and communicating with the liquid outlet main pipe (6). One end of the liquid outlet main pipe (6) is closed, and the other end is connected to the medium circulation heat dissipation system. The plurality of liquid outlet branch pipes (7) are respectively connected to the planes (3) of the rear views of a plurality of water cooling plates (2).

2. The battery pack according to claim 1, characterized in that: The size of the water cooling plate (2) matches the size of the battery cell (1).

3. The battery pack according to claim 1, wherein: The heat transfer medium is made by mixing one or more of pure water, ethylene glycol, and isopropyl alcohol in different proportions.

4. The battery pack according to claim 3, characterized in that: Both the liquid inlet main pipe (4) and the liquid outlet main pipe (6) are circular pipes, and both the liquid inlet branch pipes (5) and the liquid outlet branch pipes (7) are rectangular pipes. The width of the rectangular pipe is the same as the width of the plane (3).

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