Power battery module and heat conduction method thereof

Abstract

The invention belongs to the technical field of batteries, and provides a power battery module and a heat conduction method thereof.The module comprises a damping base, a fixing base, a battery assembly and a heat conduction assembly, the fixing base is installed in the damping base, and the battery assembly is installed on the fixing base; the heat conduction assembly is located in the fixing base and arranged around the battery assembly, and heat can be guided in or guided out through the heat conduction assembly. A plurality of damping pieces are arranged in the damping base and used for damping and supporting the fixing base. The temperature in the fixing seat can be effectively increased, the problems of reduction of electrochemical performance, reduction of endurance mileage and reduction of charging efficiency in a low-temperature environment are avoided, the use performance in the low-temperature environment is improved, bumping generated in the automobile running process is buffered through the damping base, and the service life of the automobile is prolonged. Resonance energy in the resonance system is absorbed through the damping columns and the damping springs, the influence of the resonance energy on the power battery is reduced, the fastening structure is prevented from loosening, and normal operation of the power battery is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a power battery module and a heat conduction method thereof. Background Art

[0002] As a power source, power batteries are mainly used in various electric equipment such as electric vehicles, electric trains, electric bicycles, etc. They have the advantages of high energy and high power, high energy density, wide operating temperature range, long service life, and safety and reliability. In addition to the automotive field, power batteries are also widely used in power storage systems, industrial fields, military fields, mobile equipment fields, aerospace fields and other fields. In actual applications, multiple battery cells are usually combined together to increase the total battery capacity and voltage output to form a battery module for assembly and use.

[0003] Existing power batteries have the following defects:

[0004] 1. The performance of the battery will be affected in a low temperature environment. The electrochemical performance of lithium-ion batteries will be significantly affected in a low temperature environment, which is manifested in the reduction of actual capacity, discharge rate and voltage platform. The performance on the whole vehicle will also be affected, such as reduced cruising range, weak power performance and extended charging time, which seriously affects the use of the whole vehicle.

[0005] 2. The power battery of new energy vehicles will experience greater bumps and vibrations during driving, which can easily cause resonance of the main body, loosen the fastening structural parts, affect the working condition of the battery, and may even cause safety problems. Summary of the invention

[0006] In order to solve the problems in the background technology, the present invention provides a power battery module and a heat conduction method thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A power battery module, comprising:

[0009] A fixing seat, mounted in the shock-absorbing base;

[0010] The battery assembly is mounted on the fixing seat, and a heat-conducting gap is left between the battery assemblies and between the battery assembly and the fixing seat;

[0011] A heat conduction component is connected to the automobile heat circulation system, is located in the fixing seat, and is installed around the battery assembly, and a heat conduction pipeline is arranged along the heat conduction gap;

[0012] A plurality of shock absorbing parts are arranged in the shock absorbing base for shock absorbing and supporting the fixing seat.

[0013] Preferably, the battery assembly comprises a battery base and a battery module;

[0014] A plurality of the battery bases are screwed to the inner bottom surface of the fixing base;

[0015] A plurality of the battery modules are screwed into corresponding battery bases.

[0016] Preferably, a battery management module is screwed to the fixing seat, and the battery management module is located on one side of the battery module;

[0017] The battery management module is connected to a connecting plate, and the connecting plate is connected to each battery module.

[0018] Preferably, a plurality of third through holes are formed on the outer wall of the battery base.

[0019] Preferably, the heat-conducting assembly comprises a fixing bracket, a heat-conducting copper tube and a joint;

[0020] The heat-conducting copper tube is arranged around the battery base, and is located in the heat-conducting gap between the adjacent battery bases and the heat-conducting gap between the battery and the inner wall of the fixing seat, so as to form the heat-conducting pipeline;

[0021] Both ends of the heat-conducting copper tube extend through the fixing seat to the outside, are connected to the automobile heat circulation system, and are located on the same side of the fixing seat;

[0022] The fixing brackets are provided in a plurality and fixedly connected to the inner surface of the fixing seat and used for sleeve-connecting the heat-conducting copper tube;

[0023] The joints are provided with two and are respectively connected to the two ends of the heat-conducting copper tube.

[0024] Preferably, the shock absorbing member comprises a first damping column, a second damping column and a shock absorbing spring;

[0025] The first damping column is provided with at least one, one end of which is connected to the inner bottom surface of the shock absorbing base and the other end is connected to the bottom of the fixing base;

[0026] The second damping column is provided in a plurality and arranged around the first damping column, with one end connected to the inner bottom surface of the shock absorbing base and the other end connected to the bottom of the fixing base;

[0027] A plurality of shock absorbing springs are provided and sleeved on the second damping column.

[0028] Preferably, an upper cover is installed on the top of the fixing seat.

[0029] Preferably, the outer wall of the fixing seat is provided with an integral lower fixing plate, the outer wall of the upper cover is provided with an integral upper fixing plate, and the lower fixing plate and the upper fixing plate are connected by bolts.

[0030] Preferably, an integrated first mounting plate is provided at the bottom of the shock-absorbing base, the first mounting plate and the shock-absorbing base form a step structure, and a plurality of first mounting holes are provided on the step structure.

[0031] A heat conduction method comprises the following steps:

[0032] When the temperature of the battery assembly is greater than or equal to the upper limit, heat is conducted away through the heat conduction assembly until the temperature of the battery assembly is less than the upper limit;

[0033] When the battery temperature is less than or equal to the lower limit, heat is introduced through the heat conduction component until the battery component temperature is greater than the lower limit.

[0034] Beneficial effects of the present invention:

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention is designed with a heat-conducting component. When the power battery module works in a low-temperature environment, it is connected to the automobile heat circulation system through a joint, which can effectively increase the temperature in the fixing seat, avoid the problems of reduced electrochemical performance, reduced cruising range and reduced charging efficiency caused by low-temperature environments, improve the performance in low-temperature environments, and buffer the bumps generated during the driving of the car through the shock-absorbing base, absorb the resonance energy in the resonance system through the damping column and the shock-absorbing spring, reduce its impact on the power battery, prevent the fastening structure from loosening, and ensure the normal operation of the power battery.

[0036] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 An exploded view of a power battery module of the present invention is shown;

[0039] Figure 2 An assembly view of a power battery module of the present invention is shown;

[0040] Figure 3 A side view of a power battery module of the present invention is shown;

[0041] Figure 4 The structural layout diagram of the fixing seat of the present invention is shown;

[0042] Figure 5 The present invention shows Figure 1 Magnified view of area A in the middle;

[0043] Figure 6 A flow chart of the heat conduction method of the present invention is shown.

[0044] In the figure: 1. shock-absorbing base; 2. first mounting plate; 3. first mounting hole; 4. fixing seat; 5. first damping column; 6. second damping column; 7. shock-absorbing spring; 8. lower fixing plate; 9. first through hole; 10. upper cover; 11. upper fixing plate; 12. second through hole; 13. fixing bolt; 14. battery base; 15. third through hole; 16. second mounting plate; 17. fastening bolt; 18. battery module; 19. third mounting plate; 20. connecting plate; 21. battery management module; 22. fourth mounting plate; 23. mounting seat; 24. fastening screw; 25. fourth through hole; 26. fixing bracket; 27. thermal copper pipe; 28. joint. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] A power battery module includes a shock-absorbing base 1, a fixing base 4, a battery assembly and a heat-conducting assembly. The fixing base 4 is installed in the shock-absorbing base 1, and the battery assembly is installed on the fixing base 4. At the same time, heat-conducting gaps are left between the battery assemblies and between the battery assembly and the fixing base 4. The heat-conducting assembly can be connected to the automobile thermal circulation system, located in the fixing base 4, and installed around the battery assembly. A heat-conducting pipeline is set along the heat-conducting gap, which can import or export heat. A plurality of shock-absorbing parts are set in the shock-absorbing base 1 for shock absorption and supporting the fixing base 4.

[0047] It should be noted that in the above structure, when the power battery module 18 works in a low-temperature environment, the heat circulation system of the car is connected through the heat conductive component, which can effectively increase the temperature in the fixing seat, avoid the problems of reduced performance of the battery component, reduced cruising range and reduced charging efficiency in a low-temperature environment, improve the performance in a low-temperature environment, and buffer the bumps generated during the driving of the car through the shock-absorbing base, absorb the resonance energy in the resonance system through the shock-absorbing parts, reduce its impact on the power battery, prevent the fastening structure from loosening, and ensure the normal operation of the power battery.

[0048] Combine the following Figure 1-Figure 5 The results of the power battery module are described in detail.

[0049] like Figure 1 The figure shows an exploded view of a power battery module, wherein the shock absorbing member includes a first damping column 5, a second damping column 6 and a shock absorbing spring 7. One first damping column 5 is provided, located in the middle of the shock absorbing base 1, one end of which is fixedly connected to the inner bottom surface of the shock absorbing base 1, and the other end is fixedly connected to the bottom of the fixing seat 4; four second damping columns 6 are provided, arranged around the first damping column 5, one end of which is fixedly connected to the inner bottom surface of the shock absorbing base 1, and the other end is fixedly connected to the bottom of the fixing seat 4; four shock absorbing springs 7 are provided, which are sleeved on the second damping column 6.

[0050] It should be noted that the vibration energy generated during driving can be absorbed by the first damping column 5, the second damping column 6 and the shock-absorbing spring 7, and the vibration energy can be converted into heat energy or other forms of energy dissipation, thereby achieving rapid attenuation of vibration and ensuring the stable operation of the power battery.

[0051] In addition, Figure 1 In the figure, the shock-absorbing base 1 is rectangular, and a first mounting plate 2 is integrally connected to the bottom thereof. The first mounting plate 2 and the shock-absorbing base 1 form a step structure, and a plurality of first mounting holes 3 are provided on the step structure. The shock-absorbing base 1 can be connected to an external device through the first mounting holes 3.

[0052] In addition, combined Figure 1 and Figure 3 It can be seen that an upper cover 10 is installed on the top of the fixing seat 4. In addition, an integral lower fixing plate 8 is provided on the outer wall of the fixing seat 4, and an integral upper fixing plate 11 is provided on the outer wall of the upper cover 10, and the lower fixing plate 8 and the upper fixing plate 11 are connected by bolts.

[0053] It should be noted that the following solution can also be adopted between the fixing seat 4 and the upper cover 10: the top of the fixing seat 4 is designed with a groove or a boss for matching with the upper cover 10. The bottom of the upper cover 10 is designed with a protrusion or a groove corresponding to the groove or boss at the top of the fixing seat 4 to ensure that the two can fit tightly.

[0054] like Figure 2 , which is a schematic diagram of the assembly of a power battery module, wherein from top to bottom are an upper cover 10 , a fixing seat 4 , a shock absorbing base 1 and a first mounting plate 2 .

[0055] like Figure 4 As shown, it is a layout diagram inside the fixing base 4, the fixing base 4 is adapted to the shape of the shock absorbing base 1, and the battery assembly installed thereon includes a battery base 14 and a battery module 18. Among them, the battery base 14 is provided with a plurality of (six in the figure) screws connected to the inner bottom surface of the fixing base 4; a plurality of battery modules 18 are screwed to the corresponding battery base 14, and a plurality of third through holes 15 for heat dissipation are opened on the outer walls on both sides of the battery base 14.

[0056] Furthermore, combined with Figure 4 and Figure 5 It can be seen that a third mounting plate 19 is disposed on the outer wall of the battery module 18, and a second mounting plate 16 is disposed on the outer wall of the battery base 14 at a position corresponding to the third mounting plate 19. The second mounting plate 16 and the third mounting plate 19 can be connected by fastening bolts 17.

[0057] In addition, Figure 4 The battery management module 21 is screw-connected to the middle fixing seat 4 , and the battery management module 21 is located on one side of the battery module 18 ; the battery management module 21 is connected to a connecting plate 20 , and the connecting plate 20 is connected to each battery module 18 .

[0058] Furthermore, combined with Figure 4 and Figure 1 It can be seen that a fourth mounting plate 22 is provided on the outer walls on both sides of the battery management module 21, a fourth through hole 25 is opened on the upper surface of the fourth mounting plate 22, a fastening screw 24 is sleeved in the fourth through hole 25, and a mounting seat 23 is fixedly connected to the position of the fourth mounting plate 22 on the inner wall of the fixing seat 4, and the other end of the fastening screw 24 is threadedly connected to the mounting seat 23.

[0059] It should be noted that during the installation process, the battery module 18 is first installed in the battery base 14 using the fastening bolts 17 through the second mounting plate 16 and the third mounting plate 19, and then the battery management module 21 is installed on the mounting seat 23 using the fastening screws 24 through the fourth mounting plate 22 and the fourth through hole 25, and the connecting plate 20 is connected to the battery module 18 to connect the battery modules 18 together, and then the upper cover 10 is installed on the fixing seat 4 using the fixing bolts 13 through the lower fixing plate 8, the first through hole 9, the upper fixing plate 11 and the second through hole 12. During installation, the shock absorbing base 1 is installed at the specified position using bolts through the first mounting hole 3 on the first mounting plate 2, and the connector 28 is connected to the thermal circulation system of the vehicle.

[0060] Furthermore, combined with Figure 4 and Figure 5 It can be seen that the heat-conducting component includes a fixing bracket 26, a heat-conducting copper tube 27 and a joint 28. The heat-conducting copper tube 27 is arranged around the battery base 14, and is located in the heat-conducting gap between the adjacent battery base 14 and the heat-conducting gap between the battery base 14 and the inner wall of the fixing base 4, forming a heat-conducting pipeline; both ends of the heat-conducting copper tube 27 pass through the fixing base 4 and extend to the outside, connected to the automobile thermal circulation system, and located on the same side of the fixing base 4; a plurality of fixing brackets 26 are provided, which are fixedly connected to the inner surface of the fixing base 4 and are used to sleeve the heat-conducting copper tube 27; two joints 28 are provided, which are respectively connected to the two ends of the heat-conducting copper tube 27.

[0061] It should be noted that the structural layout of the heat conducting component can also have the following implementation schemes:

[0062] 1. The heat-conducting copper tube 27 is designed to be segmented, and each segment is connected to each other through other connectors. This layout can increase the density of the heat-conducting copper tube 27 in key areas according to the specific layout and heat dissipation requirements of the battery base 14 to improve the heat dissipation efficiency. For example, the heat-conducting copper tube 27 can be divided into multiple segments, each of which is arranged around one or more battery bases 14. The fixing bracket 26 is arranged according to the position of each segment of the heat-conducting copper tube 27 to ensure stable socketing.

[0063] 2. The heat-conducting copper tube 27 is arranged in a circular or quasi-circular path around the inner wall of the battery base 14 and the fixing base 4 to form a closed-loop heat dissipation system. This layout can ensure that heat is evenly conducted in multiple directions and improve the overall heat dissipation effect. For example, the heat-conducting copper tube 27 enters from one side of the fixing base 4, goes around the outer edge of the battery base 14, and then returns to the other side of the fixing base 4 and passes out. The fixing bracket 26 is arranged along the path of the heat-conducting copper tube 27 to ensure that it is stably fixed. The joint 28 is located at the starting and ending positions of the heat-conducting copper tube 27 and is connected to an external heat dissipation device.

[0064] 3. The heat-conducting copper tube 27 is designed to be in a grid shape, covering the heat-conducting gap between the battery base 14 and the fixing base 4. This layout can provide more heat dissipation paths and further enhance the heat dissipation effect. For example, the heat-conducting copper tube 27 is arranged in a criss-cross grid form, and the size and density of the grid are adjusted according to the heat dissipation requirements of the battery base 14. The fixing bracket 26 is arranged along the intersection or edge of the grid to firmly fix the heat-conducting copper tube 27 in the fixing base 4. The joint 28 is arranged at one or more intersections of the grid and connected to the external heat dissipation device.

[0065] 4. Combine two or more of the above layout methods and flexibly combine them according to specific application scenarios and heat dissipation requirements. For example, for large battery packs or complex heat dissipation environments, a hybrid of segmented and ring layouts can be adopted. First, the thermal copper tube 27 is arranged around the main part of the battery base 14 in a ring layout, and then a segmented layout is used to increase the density of the thermal copper tube 27 in the area where heat dissipation needs to be focused. The setting of the fixed bracket 26 also needs to be adjusted according to the specific situation of the mixed layout.

[0066] like Figure 6 As shown, the heat conduction method of the power battery module is as follows:

[0067] When the battery assembly temperature is greater than or equal to the upper limit value, heat is conducted through the heat conducting assembly until the battery assembly temperature is less than the upper limit value; when the battery temperature is less than or equal to the lower limit value, heat is conducted through the heat conducting assembly until the battery assembly temperature is greater than the lower limit value.

[0068] Specifically, during use, the battery management module 21 monitors and manages the battery module 18 in real time to ensure the safety and stable performance of the battery. When the operating environment temperature is too low, the heat circulation system in the car conducts heat through the heat-conducting copper tube 27 through the connector 28 to heat the fixing seat 4 to ensure the stability of the electrochemical performance of the battery module 18. Under high temperature conditions, cooling air can also be circulated to cool the interior.

[0069] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power battery module, characterized in that: include: A fixing seat (4) installed in the shock-absorbing base (1); The battery assembly is mounted on the fixing seat (4), and a heat-conducting gap is left between the battery assemblies and between the battery assembly and the fixing seat (4); A heat conduction component is connected to the automobile heat circulation system, is located in the fixing seat (4), and is installed around the battery component, and a heat conduction pipeline is arranged along the heat conduction gap; A plurality of shock absorbing parts are arranged inside the shock absorbing base (1) for shock absorbing and supporting the fixing seat (4).

2. A power battery module according to claim 1, characterized in that: The battery assembly comprises a battery base (14) and a battery module (18); A plurality of battery bases (14) are screw-connected to the inner bottom surface of the fixing base (4); A plurality of the battery modules (18) are screw-connected in corresponding battery bases (14).

3. A power battery module according to claim 2, characterized in that: The fixing seat (4) is screw-connected with a battery management module (21), and the battery management module (21) is located on one side of the battery module (18); The battery management module (21) is connected to a connecting plate (20), and the connecting plate (20) is connected to each battery module (18).

4. A power battery module according to claim 2, characterized in that: A plurality of third through holes (15) are provided on the outer wall of the battery base (14).

5. A power battery module according to claim 2, characterized in that: The heat-conducting component comprises a fixing bracket (26), a heat-conducting copper tube (27) and a joint (28); The heat-conducting copper tube (27) is arranged around the battery base (14) and is located in the heat-conducting gap between adjacent battery bases (14) and the heat-conducting gap between the battery base (14) and the inner wall of the fixing base (4), forming the heat-conducting pipeline; Both ends of the heat-conducting copper tube (27) pass through the fixing seat (4) and extend to the outside, are connected to the automobile heat circulation system, and are located on the same side of the fixing seat (4); A plurality of fixing brackets (26) are provided, fixedly connected to the inner surface of the fixing seat (4) and used for sleeve-connecting the heat-conducting copper tube (27); Two joints (28) are provided, which are respectively connected to the two ends of the heat-conducting copper tube (27).

6. A power battery module according to claim 1, characterized in that: The shock absorbing component comprises a first damping column (5), a second damping column (6) and a shock absorbing spring (7); At least one first damping column (5) is provided, one end of which is connected to the inner bottom surface of the shock-absorbing base (1) and the other end of which is connected to the bottom of the fixing base (4); A plurality of second damping columns (6) are provided, which are arranged around the first damping column (5), one end of which is connected to the inner bottom surface of the shock-absorbing base (1), and the other end of which is connected to the bottom of the fixing base (4); A plurality of shock absorbing springs (7) are provided and sleeved on the second damping column (6).

7. The power battery module according to claim 1, characterized in that: An upper cover (10) is installed on the top of the fixing seat (4).

8. A power battery module according to claim 7, characterized in that: The outer wall of the fixing seat (4) is provided with an integral lower fixing plate (8), and the outer wall of the upper cover (10) is provided with an integral upper fixing plate (11), and the lower fixing plate (8) and the upper fixing plate (11) are connected by bolts.

9. A power battery module according to any one of claims 1 to 8, characterized in that: An integrated first mounting plate (2) is provided at the bottom of the shock-absorbing base (1); the first mounting plate (2) and the shock-absorbing base (1) form a step structure; and a plurality of first mounting holes (3) are provided on the step structure.

10. A heat conduction method, applied to a power battery module according to any one of claims 1 to 9, characterized in that: The following steps are involved: When the temperature of the battery assembly is greater than or equal to the upper limit, heat is conducted away through the heat conduction assembly until the temperature of the battery assembly is less than the upper limit; When the battery temperature is less than or equal to the lower limit, heat is introduced through the heat conduction component until the battery component temperature is greater than the lower limit.

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