Single cell and battery module thereof

Abstract

The invention provides a single cell and a battery module thereof, the single cell comprises a plurality of single cells, the plurality of single cells are uniformly placed in a battery box body, a liquid cooling plate is arranged at the top end of the battery box body, a water inlet is formed in one end of the liquid cooling plate, a water outlet is formed in one end of the liquid cooling plate, and a plurality of side liquid cooling pipes are arranged on two sides of the bottom end of the liquid cooling plate; a plurality of main liquid cooling pipes are arranged in the middle of the bottom end of the liquid cooling plate; through the arc-shaped grooves in the two ends of the single battery cells, side liquid cooling can be placed in the arc-shaped grooves, a cavity is formed between the two rows of adjacent battery cells through the arc-shaped grooves, a main liquid cooling pipe can be placed, the cooling mechanism does not need to occupy a large amount of space in the battery module, and the number of single batteries in the single box body can be increased; the energy density of a single battery module can be effectively improved, the space utilization rate in the battery box body is high, and the practicability is high.

Description

Technical Field

[0001] The present invention relates to the field of lithium ion batteries, and in particular to a single battery cell and a battery module thereof. Background Art

[0002] Secondary batteries, also known as rechargeable batteries or storage batteries, refer to batteries that can be recharged to activate active chemicals and continue to be used after being discharged. Existing secondary batteries are usually used by combining multiple single secondary batteries and placing them in a box to form a module for use.

[0003] In the prior art, a module composed of single cells generates a large amount of heat during use, and a cooling mechanism needs to be set up. The existing cooling mechanism needs to occupy a large amount of space in the battery module, resulting in a reduction in the number of single cells in the single box, which in turn causes the energy density of a single battery module to be low, the space utilization rate in the battery box to be low, and poor practicality.

[0004] To this end, we propose a single battery cell and a battery module thereof to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a single battery cell and a battery module thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A single cell battery comprises a single battery, both ends of which are provided with arc grooves.

[0007] Further preferably, the arc-shaped grooves are symmetrically arranged.

[0008] Further preferably, the arc angle of the arc groove is between 30° and 75°.

[0009] A battery module comprises the above-mentioned single battery cell, wherein there are multiple single batteries, and the multiple single batteries are evenly placed in a battery box. A liquid cooling plate is provided at the top of the battery box, a water inlet is provided at one end of the liquid cooling plate, a water outlet is provided at one end of the liquid cooling plate, multiple side liquid cooling tubes are provided on both sides of the bottom end of the liquid cooling plate, and multiple main liquid cooling tubes are provided in the middle position of the bottom end of the liquid cooling plate.

[0010] Further preferably, thermal insulation pads are provided between the plurality of single cells, and the plurality of thermal insulation pads are rectangular and fit the single cells.

[0011] Further preferably, the plurality of side liquid cooling tubes are cylindrical, and the spacings between the plurality of side liquid cooling tubes are consistent.

[0012] Further preferably, the plurality of main liquid cooling tubes are all in the shape of a hexagonal pyramid, and the spacings between the plurality of main liquid cooling tubes are consistent.

[0013] Further preferably, the diameters of the inscribed circles of the transverse surfaces of the plurality of main liquid cooling tubes are all larger than the cross-sectional diameters of the plurality of side liquid cooling tubes.

[0014] Further preferably, a plurality of fixing blocks are provided on both sides of the plurality of main liquid cooling tubes, and the plurality of fixing blocks are symmetrically arranged with the main liquid cooling tube as the center.

[0015] Further preferably, one side of the plurality of fixing blocks is arc-shaped, and the curvature of the one side of the fixing blocks is consistent with the curvature of the arc-shaped groove, and one side of the plurality of fixing blocks is in contact with the single battery.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the side liquid cooling can be placed in the arc grooves through the arc grooves at both ends of the single battery cell, and a cavity is formed between two rows of adjacent battery cells through the arc grooves, in which the main liquid cooling pipe can be placed. The cooling mechanism does not need to occupy a large amount of space in the battery module, the number of single batteries in the single box can be increased, and the energy density of a single battery module can be effectively improved. The space utilization rate in the battery box is high and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the battery box structure provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the internal structure of the battery box; Figure 3 for Figure 2 Schematic diagram of the structure of the middle side liquid cooling tube and the main liquid cooling tube; Figure 4 for Figure 2 Schematic diagram of the connection structure of the single cell battery; Figure 5 for Figure 2 Schematic diagram of the structure of a single cell battery.

[0018] In the figure: 1. Battery box; 2. Liquid cooling plate; 3. Water inlet; 4. Water outlet; 5. Single battery; 6. Side liquid cooling pipe; 7. Main liquid cooling pipe; 8. Fixing block; 9. Insulation pad; 10. Arc groove. Implementation

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figure 1-Figure 5A single cell, comprising a single cell 5, the single cell 5 is composed of a battery shell, a battery top cover and a pole, wherein the transverse surface of the battery shell is consistent with the transverse surface of the battery top cover, both ends are arc-shaped, and the top of the battery is connected to an external bus or output for charging and discharging; Both ends of the single battery 5 are provided with arc grooves 10, and the arc grooves 10 are symmetrically arranged, so that the shape of each single battery 5 is consistent, which is convenient for stacking and installing multiple single batteries 5. The curvature of the arc groove 10 is 30°-75°, and the curvature of the arc groove 10 is preferably 45°. The 45° arc groove 10 can effectively confine the side liquid cooling pipe 6 in the arc groove 10, and a cavity can be formed between two adjacent rows of single batteries 5, so that there is enough space to place the main liquid cooling pipe 7.

[0021] A battery module includes the above-mentioned single battery cell, wherein there are multiple single batteries 5, and the multiple single batteries 5 are evenly placed in a battery box 1. A liquid cooling plate 2 is provided on the top of the battery box 1, and the liquid cooling plate 2 is fixedly integrated as an upper cover, so that the battery box 1 can be sealed without a cover plate, which can effectively reduce the weight. At the same time, the liquid cooling plate 2 is hollow inside, which can realize the function of circulating the coolant in the liquid cooling plate 2. The liquid cooling plate 2 can be fixed to the battery box 1 by welding or bolting; A water inlet 3 is provided at one end of the liquid cooling plate 2, and a water outlet 4 is provided at one end of the liquid cooling plate 2. The coolant enters the liquid cooling plate 2 through the water inlet 3, and then circulates out of the liquid cooling plate 2 through the water outlet 4, thereby realizing the function of cooling circulation. A plurality of side liquid cooling tubes 6 are provided on both sides of the bottom end of the liquid cooling plate 2, and a plurality of main liquid cooling tubes 7 are provided in the middle position of the bottom end of the liquid cooling plate 2. The coolant in the liquid cooling plate 2 circulates through the side liquid cooling tubes 6 and the main liquid cooling tubes 7, takes away the heat generated by the single cell 5, and then takes the heat out through the water outlet 4, thereby realizing the function of heat dissipation for each single cell 5.

[0022] Through the arc grooves 10 at both ends of the single battery cell, the side liquid cooling can be placed in the arc grooves 10, and a cavity is formed between two rows of adjacent battery cells through the arc grooves 10, in which the main liquid cooling tube 7 can be placed. The cooling mechanism does not need to occupy a large amount of space in the battery module, and the number of single batteries 5 in the single box can be increased, which can effectively improve the energy density of a single battery module. The space utilization rate in the battery box 1 is high and the practicality is strong.

[0023] Insulation pads 9 are provided between multiple single cells 5. Multiple insulation pads 9 are rectangular and fit with single cells 5. The insulation pads 9 can dissipate heat from the large surface of the single cell 5, and can effectively dissipate heat from the large surface and side surfaces of the single cell 5. At the same time, the single cell 5 may swell during use. The insulation pads 9 can play a buffering and protective role, and can effectively prevent the single cells 5 from being squeezed against each other, causing damage and leakage of the single cell 5, and can effectively improve the stability of the single cell 5. The insulation pads 9 and the single cell 5 can be bonded by thermally conductive structural adhesive, and multiple single cells can be bonded together by the insulation pads 9 and the thermally conductive structural adhesive, which can improve the heat dissipation performance while further improving the stability of the single cell in the battery box 1.

[0024] The plurality of side liquid cooling tubes 6 are cylindrical, and the cylindrical side liquid cooling tubes 6 can fit into the arc groove 10, so that the side liquid cooling tubes 6 are not easily squeezed and broken, which can improve the service life of the side liquid cooling tubes 6. The spacing between the plurality of side liquid cooling tubes 6 is consistent, so that the side of the single cell 5 can be effectively and evenly dissipated, and the heat dissipation performance of the side of each single cell 5 can be made consistent, which can improve the heat dissipation consistency and thus improve the service life of the single cell 5.

[0025] The multiple main liquid cooling tubes 7 are all in the shape of a hexagonal pyramid. The hexagonal pyramid shape has good stability, and the hexagonal pyramid has six faces, which can improve the heat dissipation performance. The spacing between the multiple main liquid cooling tubes 7 is consistent, so that the adjacent parts of the single battery cells 5 can be effectively and evenly dissipated. The heat dissipation performance of the adjacent parts of each single battery cell 5 can be consistent, which can improve the heat dissipation consistency and thus increase the service life of the single battery cell 5.

[0026] The diameters of the inscribed circles of the transverse surfaces of the multiple main liquid cooling tubes 7 are all larger than the cross-sectional diameters of the multiple side liquid cooling tubes 6. During use, the single cells 5 will radiate heat in all directions, so that the heat generated in the middle position of the battery box 1 will be higher. By increasing the transverse area of ​​the main liquid cooling tubes 7, the heat dissipation performance of the main liquid cooling tubes 7 can be stronger than that of the side liquid cooling tubes 6, and the heat dissipation performance of the middle position adjacent to the single cells 5 can be improved. The temperature of the side of the single cell 5 and the middle position of the adjacent single cell 5 can be made consistent, thereby increasing the service life of the single cell 5.

[0027] A plurality of fixing blocks 8 are provided on both sides of the plurality of main liquid cooling tubes 7. The fixing blocks 8 will respectively fix the main liquid cooling tubes 7 and the single cells 5 at both ends of the main liquid cooling tubes 7, thereby fixing the single cells 5 and the main liquid cooling tubes 7 and preventing the main liquid cooling tubes 7 from shifting in position, thereby further improving the stability of the single cells 5 and preventing the heat dissipation performance of the single cells 5 from being uneven due to the displacement of the main liquid cooling tubes 7. The plurality of fixing blocks 8 are symmetrically arranged with the main liquid cooling tubes 7 as the center, thereby further improving the stability of the fixing blocks 8.

[0028] One side of the multiple fixing blocks 8 is arc-shaped, and the curvature of one side of the fixing blocks 8 is consistent with the curvature of the arc groove 10. One side of the multiple fixing blocks 8 is in contact with the single battery 5 so that the fixing blocks 8 and the arc groove 10 can fit tightly without any gaps, which can improve stability. The connection between the arc groove 10 and the fixing block 8 can be connected with a thermally conductive structural adhesive to improve the heat dissipation performance.

Claims

1. A single cell, comprising a single battery, characterized in that: Both ends of the single battery are provided with arc grooves.

2. A single cell according to claim 1, characterized in that: The arc-shaped grooves are all symmetrically arranged.

3. A single cell according to claim 1, characterized in that: The arc angle of the arc groove is between 30° and 75°.

4. A battery module, comprising a single cell according to claim 1-3, characterized in that: There are multiple single cells, and the multiple single cells are evenly placed in a battery box. A liquid cooling plate is provided at the top of the battery box, a water inlet is provided at one end of the liquid cooling plate, a water outlet is provided at one end of the liquid cooling plate, multiple side liquid cooling tubes are provided on both sides of the bottom of the liquid cooling plate, and multiple main liquid cooling tubes are provided in the middle of the bottom of the liquid cooling plate.

5. A battery module according to claim 4, characterized in that: Heat insulation pads are arranged between the plurality of single cells, and the plurality of heat insulation pads are rectangular and fit with the single cells.

6. A battery module according to claim 4, characterized in that: The plurality of side liquid cooling tubes are cylindrical, and the spacings between the plurality of side liquid cooling tubes are consistent.

7. A battery module according to claim 4, characterized in that: The plurality of main liquid cooling tubes are all in the shape of a hexagonal pyramid, and the spacings between the plurality of main liquid cooling tubes are consistent.

8. A battery module according to claim 4, characterized in that: The diameters of the inscribed circles of the transverse surfaces of the plurality of main liquid cooling tubes are all larger than the cross-sectional diameters of the plurality of side liquid cooling tubes.

9. A battery module according to claim 4, characterized in that: A plurality of fixing blocks are arranged on both sides of the plurality of main liquid cooling pipes, and the plurality of fixing blocks are symmetrically arranged with the main liquid cooling pipe as the center.

10. A battery module according to claim 9, characterized in that: One side of the plurality of fixing blocks is arc-shaped, and the curvature of the one side of the fixing blocks is consistent with the curvature of the arc-shaped groove, and one side of the plurality of fixing blocks is in contact with the single battery.

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