Power battery module fastening structure

Abstract

The invention relates to the technical field of secondary batteries, in particular to a power battery module fastening structure. Comprising two shells, the two shells are jointly provided with a plurality of bolts, the bolts are in threaded connection with nuts, the shells are fixedly connected with elastic plates, a battery cell is placed between the two elastic plates, the shells are provided with communicating holes, the shells are fixedly connected with a plurality of cooling pipes, and two first communicating shells are fixedly connected outside the shells; a first connecting pipe is communicated between the two first communicating shells on one side of the two shells, one shell is fixedly connected with a circulating pump, a water inlet of the circulating pump is communicated with a second connecting pipe, a water outlet of the circulating pump is communicated with a first hard pipe, the first hard pipe is communicated with a second communicating shell, and the second communicating shell is communicated with a second hard pipe. According to the invention, the two elastic plates are used for supporting the battery cell when the battery cell works normally and providing an expansion space for the battery cell when the battery cell expands, so that the situation that the battery cell cannot expand normally, so that internal stress is concentrated, the battery cell is damaged or a bolt is loosened is prevented.

Description

Technical Field

[0001] This invention relates to the field of secondary battery technology, and in particular to a fastening structure for a power battery module. Background Technology

[0002] A power battery is a power source that provides power to tools, and it mainly refers to the storage battery that powers electric vehicles, electric trains, electric bicycles, golf carts, etc. Types of power batteries include lead-acid batteries, nickel-metal hydride power batteries, and lithium-ion power batteries. With the rapid development of new energy vehicles, the research and development of power batteries has also accelerated. Power batteries generally require a fastening structure to fix the cells and to install them on electric vehicles.

[0003] Power batteries operate in two states: charging and discharging. A major obstacle to the development of the electric vehicle industry is the low efficiency of battery charging. Therefore, battery companies strive to improve charging efficiency to enhance their market competitiveness. During high-speed charging, the battery's temperature rises rapidly, and it expands. This expansion is unavoidable and reversible, and does not affect the battery's normal operation. However, existing fastening structures often use bolts to secure the battery cells, failing to provide expansion space. This results in increased internal stress concentration during charging expansion, shortening the cell's lifespan. Summary of the Invention

[0004] To overcome the shortcomings mentioned in the background art, the present invention provides a power battery module fastening structure.

[0005] The technical implementation scheme of the present invention is as follows: a power battery module fastening structure includes two housings, both housings are provided with a plurality of bolts, the bolts are threaded to nuts, the bolts and nuts lock the two housings together, the housings are fixedly connected to elastic plates, and battery cells are placed between the two elastic plates, the housings are provided with a plurality of sets of connecting holes, each set of connecting holes having two holes, the housings are fixedly connected to a plurality of cooling pipes, the cooling pipes connect two of the connecting holes that are mirror-distributed, the housings are fixedly connected to two of the first connecting shells that are mirror-distributed, the connecting holes connect to adjacent first connecting shells, a first connecting pipe connects two of the first connecting shells on one side of the two housings, one housing is fixedly connected to a circulation pump, the inlet of the circulation pump is connected to a second connecting pipe, the outlet of the circulation pump is connected to a first rigid pipe, the first rigid pipe connects to a second connecting shell, the second connecting shell connects to a second rigid pipe, the second connecting pipe and the second rigid pipe are respectively connected to adjacent first connecting shells.

[0006] More preferably, the cooling pipe is made of an elastic material, and the housing and the elastic plate are pressed against the adjacent cooling pipes, thereby changing the contact area between the cooling pipe and the adjacent housing and the adjacent elastic plate when compressed.

[0007] More preferably, the housing is provided with a plurality of heat dissipation protrusions, which are used to increase the heat dissipation area of ​​the housing.

[0008] More preferably, a plurality of limiting strips are fixedly connected inside the housing, and the limiting strips are alternately distributed with the cooling pipes.

[0009] More preferably, the second communicating shell is slidably connected to an adjusting plate, the adjusting plate being used to adjust the communicating area of ​​the second communicating shell, and the adjusting plate being fixedly connected to an operating rod, the operating rod passing through the second communicating shell.

[0010] More preferably, a first sliding rod is fixedly connected to the elastic plate near the second communicating shell, the first sliding rod passes through the adjacent shell, and the first sliding rod and the operating rod are jointly fixedly connected to a transmission rod.

[0011] More preferably, the housing is hinged with a plurality of heat sinks, each corresponding to a heat dissipation protrusion, and the heat sinks are used to increase the heat dissipation area of ​​the housing.

[0012] More preferably, the side of the heat sink away from the housing is coated with a thermal insulation material.

[0013] More preferably, the heat sink is provided with a cooling channel, and both ends of the cooling channel are connected to a third connecting pipe, which is connected to the adjacent first connecting shell.

[0014] More preferably, the elastic plate is fixedly connected to a second sliding rod, the second sliding rod passes through the housing, the heat sink is hinged to a connecting member, the second sliding rod is fixedly connected to a transmission member, and the transmission member is slidably connected to the adjacent connecting member.

[0015] The beneficial effects of the present invention are as follows: The present invention provides support for the battery cell when it is working normally through two elastic plates, and provides expansion space for the battery cell when it expands, thereby preventing the battery cell from being damaged due to internal stress concentration caused by its inability to expand normally, or causing the bolts to loosen.

[0016] By circulating the coolant within the cooling pipes, the temperature of the battery cell is balanced, preventing uneven expansion caused by localized overheating, thereby extending battery life. When the battery cell temperature rises and expands, the elastic plate squeezes the cooling pipes, increasing the contact area between the cooling pipes, the elastic plate, and the casing, improving heat dissipation efficiency, and maintaining the battery cell temperature.

[0017] The second sliding rod is moved by the elastic plate, which in turn drives the heat sink to open, thereby improving the heat dissipation efficiency of the battery cell. When the battery cell temperature is low, the heat sink insulation layer keeps the battery cell warm, keeping the battery cell temperature within the optimal operating range. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the housing of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the first and second connected shells of the present invention. Figure 5 for Figure 3 Enlarged view of point A in the middle.

[0019] The attached drawings include the following reference numerals: 1: housing, 101: connecting hole, 102: heat dissipation protrusion, 2: bolt, 3: nut, 4: elastic plate, 5: cooling pipe, 6: first connecting shell, 7: first connecting pipe, 8: circulating pump, 9: second connecting pipe, 10: first rigid pipe, 11: second connecting shell, 12: second rigid pipe, 13: limiting strip, 14: adjusting plate, 15: operating lever, 16: first sliding rod, 17: transmission rod, 18: heat sink, 1801: cooling channel, 19: third connecting pipe, 20: second sliding rod, 21: connector, 22: transmission component. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0021] Example 1

[0022] The existing fastening structure cannot provide expansion space for the battery cell when it expands during use. This will cause the battery cell to be under increased pressure during the expansion process of charging, which cannot be released, resulting in internal stress concentration and shortening the service life of the battery cell.

[0023] A power battery module fastening structure, such as Figures 1-5As shown, the device includes two housings 1, both housings 1 are equipped with several bolts 2, and the bolts 2 are threaded with nuts 3. The bolts 2 and nuts 3 lock the two housings 1 together. An elastic plate 4 is fixed to each housing 1, and a battery cell is placed between the two elastic plates 4. Because the edge of the elastic plate 4 is fixed to the housing 1, when the battery cell is placed on it, the edge of the battery cell is blocked by the edge of the elastic plate 4, so the battery cell will not deform under the pressure of gravity due to the elasticity of the elastic plate 4. Both housings 1 and elastic plates 4 are made of highly thermally conductive metal materials, but housing 1 is a rigid metal material, such as aluminum alloy. Housings 1 are provided with seven sets of connecting holes 101, each set of connecting holes 101 having two symmetrically distributed front and back. Seven cooling pipes 5 are fixed to housings 1, connecting two adjacent connecting holes 101. Two mirror-distributed first connecting pipes are fixed to the outside of housings 1. The housing 6 has a first connecting housing 6 for connecting the corresponding cooling pipe 5. The connecting hole 101 is connected to the adjacent first connecting housing 6. The two first connecting housings 6 on the rear side are connected by a first connecting pipe 7. The upper housing 1 is fixedly connected to a circulation pump 8. The inlet of the circulation pump 8 is connected to a second connecting pipe 9. The outlet of the circulation pump 8 is connected to a first rigid pipe 10. The first rigid pipe 10 is connected to a second connecting housing 11. The second connecting housing 11 is connected to a second rigid pipe 12. The second connecting pipe 9 and the second rigid pipe 12 are respectively connected to the adjacent first connecting housing 6. Coolant is filled in the cooling pipe 5, the first connecting housing 6, the first connecting pipe 7, the circulation pump 8, the second connecting pipe 9, the first rigid pipe 10, the second connecting housing 11, and the second rigid pipe 12. The circulation pump 8 makes the coolant in the pipe flow, thereby balancing the temperature of each part of the battery cell and dissipating the heat of the battery cell. The cooling pipe 5 is made of elastic material. The housing 1 and the elastic plate 4 press against the adjacent cooling pipe 5. When compressed, the contact area between the cooling pipe 5 and the adjacent housing 1 and the adjacent elastic plate 4 is changed, thereby improving the heat exchange efficiency between the cooling pipe 5 and the adjacent housing 1 and the adjacent elastic plate 4, and improving the heat dissipation efficiency of the device for the battery cell. The housing 1 is provided with several heat dissipation protrusions 102, which are used to increase the heat dissipation area of ​​the housing 1, thereby preventing the battery cell temperature from becoming too high.

[0024] like Figure 2 , Figure 3 and Figure 5 As shown, six limiting strips 13 are fixed inside the housing 1. The limiting strips 13 are alternately distributed with the cooling pipes 5. The limiting strips 13 are used to prevent the elastic plate 4 from excessively squeezing the cooling pipes 5, thereby avoiding blockage of the cooling pipes 5 and preventing the coolant from passing through.

[0025] When using this device, first place the battery cell on the lower elastic plate 4, then fasten the upper and lower housings 1 together. Secure the two housings 1 with bolts 2 and nuts 3. After securing, it can be installed on an electric vehicle. When charging the battery cell, the cell heats up and expands. At this time, the battery cell compresses the elastic plate 4, causing the elastic plate 4 to deform, thus preventing damage due to excessive internal stress during expansion. Simultaneously, the circulation pump 8 starts, circulating the coolant. The circulation route is: circulation pump 8, first rigid pipe 10, second connecting shell 11, second rigid pipe 12, upper front first connecting shell 6, upper cooling pipe 5, upper rear first connecting shell 6, first connecting pipe 7, lower... The rear first connecting shell 6, the lower cooling pipe 5, the lower front first connecting shell 6, the second connecting pipe 9, and the circulation pump 8 are used to balance the temperature of the battery cell, prevent uneven expansion caused by local overheating, and extend the battery cell life. The heat dissipation protrusion 102 exchanges heat with the air to cool the battery cell. When the battery cell temperature is higher and the expansion is greater, the deformation caused by the battery cell pressing the elastic plate 4 is greater. The elastic plate 4 presses the cooling pipe 5, increasing the contact area between the cooling pipe 5 and the elastic plate 4 and the shell 1, thereby improving the heat exchange efficiency between the cooling pipe 5 and the elastic plate 4 and the shell 1, and thus improving the heat dissipation efficiency of the battery cell. At the same time, the limiting strip 13 prevents the elastic plate 4 from deforming too much and causing the cooling pipe 5 to be blocked.

[0026] Example 2

[0027] Based on Example 1, such as Figure 4 As shown, the second connecting shell 11 is slidably connected to an adjusting plate 14. The adjusting plate 14 is used to adjust the connecting area of ​​the second connecting shell 11. A sealing element is provided between the adjusting plate 14 and the second connecting shell 11 to prevent coolant leakage. The adjusting plate 14 is used to adjust the connecting area of ​​the second connecting shell 11, thereby changing the flow rate of coolant in the pipeline. An operating rod 15 is fixedly connected to the adjusting plate 14, and the operating rod 15 passes through the second connecting shell 11.

[0028] like Figure 4 As shown, the upper elastic plate 4 is fixedly connected to the first sliding rod 16, which passes through the adjacent housing 1. The first sliding rod 16 and the operating rod 15 are jointly fixedly connected to the transmission rod 17, so that when the elastic plate 4 deforms, the elastic plate 4 drives the first sliding rod 16 to move, which in turn drives the adjusting plate 14 to move.

[0029] like Figure 1 , Figure 2 and Figure 5As shown, the housing 1 is hinged with several heat sinks 18, each corresponding to a heat dissipation protrusion 102. The heat sinks 18 increase the heat dissipation area of ​​the housing 1, thereby improving the heat dissipation efficiency of the device. The side of the heat sink 18 away from the housing 1 is coated with thermal insulation material, thereby reducing the heat loss of the battery cell in the device when the ambient temperature is low, keeping the battery cell temperature within the optimal operating range. The heat sink 18 is provided with a cooling channel 1801, and both ends of the cooling channel 1801 are connected to a third connecting pipe 19. The third connecting pipe 19 is connected to the adjacent first connecting shell 6. Coolant is also filled into the cooling channel 1801 and the third connecting pipe 19, thereby further improving the heat dissipation efficiency of the device.

[0030] like Figure 5 As shown, the elastic plate 4 is fixedly connected to a second sliding rod 20, which passes through the housing 1. The heat sink 18 is hinged to a connector 21, which consists of two round rods and a plate. The second sliding rod 20 is fixedly connected to a transmission component 22, which is a rectangular frame. One round rod of the connector 21 is located within the rectangular frame of the transmission component 22. The transmission component 22 is slidably connected to the adjacent connector 21, so that when the elastic plate 4 of the cell expands and deforms, the heat sink 18 is opened, thereby improving the heat dissipation effect of the device.

[0031] When the battery cell expands and compresses the elastic plate 4, the elastic plate 4 drives the second sliding rod 20 to move, the second sliding rod 20 drives the transmission component 22 to move, the transmission component 22 drives the connecting component 21 to move, and the connecting component 21 drives the heat sink 18 to rotate, thereby opening the heat sink 18 and improving the heat dissipation efficiency of the device. At the same time, the elastic plate 4 drives the first sliding rod 16 to move, the first sliding rod 16 drives the operating rod 15 to move through the transmission rod 17, and the operating rod 15 drives the adjusting plate 14 to move, thereby increasing the communication area of ​​the second connecting shell 11, thereby increasing the circulation speed of the coolant in the pipe and dissipating the heat generated by the battery cell more quickly. When the battery cell temperature is low, the volume of the battery cell returns to its original size. At this time, the elastic plate 4 drives the circulation pump 8 to return to its original position, reducing the heat dissipation efficiency of the device. Under the action of the heat insulation material coated on the circulation pump 8, the temperature of the battery cell is maintained in the optimal operating range.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fastening structure for a power battery module, characterized in that, The device includes two housings (1), both housings (1) are provided with several bolts (2), the bolts (2) are threaded with nuts (3), the bolts (2) and the nuts (3) lock the two housings (1) together, the housings (1) are fixedly connected with elastic plates (4), and the battery cell is placed between the two elastic plates (4), the housings (1) are provided with several sets of connecting holes (101), each set of connecting holes (101) has two holes, the housings (1) are fixedly connected with several cooling pipes (5), the cooling pipes (5) connect the two connecting holes (101) that are mirror-distributed, and two first connecting shells (101) that are mirror-distributed are fixedly connected to the outside of the housings (1). 6) The connecting hole (101) is connected to the adjacent first connecting shell (6). A first connecting pipe (7) is connected between the two first connecting shells (6) on one side of the two shells (1). A circulation pump (8) is fixedly connected to one of the shells (1). The inlet of the circulation pump (8) is connected to the second connecting pipe (9). The outlet of the circulation pump (8) is connected to the first hard pipe (10). The first hard pipe (10) is connected to the second connecting shell (11). The second connecting shell (11) is connected to the second hard pipe (12). The second connecting pipe (9) and the second hard pipe (12) are respectively connected to the adjacent first connecting shell (6).

2. The power battery module fastening structure according to claim 1, characterized in that, The cooling pipe (5) is made of elastic material. The housing (1) and the elastic plate (4) are squeezed against the adjacent cooling pipe (5). When squeezed, the contact area between the cooling pipe (5) and the adjacent housing (1) and the adjacent elastic plate (4) is changed.

3. A power battery module fastening structure according to claim 1, characterized in that, The housing (1) is provided with a plurality of heat dissipation protrusions (102), which are used to increase the heat dissipation area of ​​the housing (1).

4. A power battery module fastening structure according to claim 2, characterized in that, A number of limiting strips (13) are fixed inside the housing (1), and the limiting strips (13) and the cooling pipe (5) are alternately distributed.

5. A power battery module fastening structure according to claim 1, characterized in that, The second connecting shell (11) is slidably connected to an adjusting plate (14), the adjusting plate (14) is used to adjust the connecting area of ​​the second connecting shell (11), and the adjusting plate (14) is fixedly connected to an operating rod (15), the operating rod (15) passes through the second connecting shell (11).

6. A power battery module fastening structure according to claim 5, characterized in that, The elastic plate (4) near the second connecting shell (11) is fixedly connected to a first sliding rod (16), which passes through the adjacent shell (1). The first sliding rod (16) and the operating rod (15) are jointly fixedly connected to a transmission rod (17).

7. A power battery module fastening structure according to claim 3, characterized in that, The housing (1) is hinged with a number of heat sinks (18), and the heat sinks (18) correspond one-to-one with the heat dissipation protrusions (102). The heat sinks (18) are used to increase the heat dissipation area of ​​the housing (1).

8. A power battery module fastening structure according to claim 7, characterized in that, The heat sink (18) is coated with thermal insulation material on the side away from the housing (1).

9. A power battery module fastening structure according to claim 7, characterized in that, The heat sink (18) is provided with a cooling channel (1801), and both ends of the cooling channel (1801) are connected to a third connecting pipe (19). The third connecting pipe (19) is connected to the adjacent first connecting shell (6).

10. A power battery module fastening structure according to claim 7, characterized in that, The elastic plate (4) is fixedly connected to a second sliding rod (20), which passes through the housing (1). The heat sink (18) is hinged to a connector (21). The second sliding rod (20) is fixedly connected to a transmission member (22), which is slidably connected to the adjacent connector (21).

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