New energy battery pack composite material shell

Abstract

The invention discloses a new energy battery pack composite material shell which comprises a battery pack shell body and a controller shell body connected to one side of the battery pack shell body, and the top of the battery pack shell body is connected with a battery pack shell cover. According to the new energy battery pack composite material shell, a side plate and a side tightening plate are connected and installed, and then a connecting fastening plate and the side tightening plate are connected and installed; the problems that the whole fixing structure needs to be replaced during maintenance and replacement when a traditional fixing structure is integrally formed, and the cost is high are solved, the maintenance cost is reduced, and the working efficiency during maintenance is improved. The side plate, the side tightening plate and the connecting fastening plate are matched with the first strain part, the second strain part and the third strain part, so that the battery module can deform along with the battery module when the battery module is subjected to thermal expansion during working, and the problem that the battery module is subjected to thermal expansion and cold contraction deformation due to environment temperature changes such as heating by a traditional fixing structure is solved; and effective and reasonable countermeasures are lacked, and the practical performance of the battery pack shell can be improved.

Description

Technical Field

[0001] This invention relates to the field of battery device technology, specifically to a composite material shell for a new energy battery pack. Background Technology

[0002] With the popularization of new energy vehicles, the safety and stability of battery packs are becoming increasingly critical. In order to ensure that the battery modules of the vehicle battery pack are relatively fixed to the vehicle body during vehicle driving, it is necessary to strengthen the fixation of the battery modules. However, traditional fixing methods are difficult to take into account dynamic conditions such as thermal expansion and contraction when strengthening the fixation of battery modules.

[0003] Current battery modules use rigid frames to ensure their stability after fixing. However, the rigid fixing structure does not reserve expansion space or design a buffer structure. When the battery module experiences thermal expansion and contraction, its slight expansion will be affected by the fixing structure and transformed into huge internal stress, which will affect the service life and stability of the battery module.

[0004] If expansion space is reserved, the stability of the battery module cannot be well guaranteed when the car encounters bumps or other working conditions. If a buffer structure is set up, that is, the traditional method is to use a buffer pad to cope with the thermal expansion and contraction of the battery module. However, only the side of the buffer pad that is in contact with the cooling plate can maintain normal heat dissipation. The buffer pads on the other sides will affect the heat dissipation efficiency of the battery module, causing heat accumulation when the battery module is working.

[0005] Meanwhile, the traditional fixing structure of the battery pack casing is integrally molded, which means that the entire structure needs to be replaced when the fixing structure needs to be replaced, which is costly. In addition, the integrally molded fixing structure is inconvenient to repair and has low repair efficiency.

[0006] When reinforcing and fixing the battery module, the fixing structure covers the outside of the battery module, affecting the heat dissipation effect of the battery module, which in turn affects the normal heat dissipation of the battery module. This results in a higher temperature inside the battery pack casing when the battery module is working, which affects the lifespan of electronic components. Summary of the Invention

[0007] To address the above problems, this invention provides a composite material shell for a new energy battery pack, which solves the aforementioned issues.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a composite material housing for a new energy battery pack, comprising a battery pack housing and a controller housing connected to one side of the battery pack housing, wherein a battery pack cover is connected to the top of the battery pack housing, a controller cover is connected to the top of the controller housing, a plurality of battery modules are installed in the battery pack housing, an installation mechanism is connected to the inner bottom surface of the battery pack housing, and a fastening mechanism is connected to the top of the installation mechanism;

[0009] The fastening mechanism includes a pair of side plates and a fastening plate. The battery module is disposed between the pair of side plates. The two sides of the fastening plate are respectively connected to the top of the two side plates. The connection between the fastening plate and the side plates is a connecting part. The width of the connecting part is greater than that of the side plates and the fastening plate.

[0010] A first strain gauge is provided on the side plate, and a mounting plate is connected to the bottom of the side. Mounting grooves are respectively opened on the upper and lower sides of the first strain gauge of the side plate, and the two mounting grooves are symmetrically distributed.

[0011] Each of the two side plates is connected to a side clamping plate on one side. The upper and lower ends of the side clamping plates are respectively connected to mounting blocks. The two mounting blocks are symmetrically distributed and engage with the mounting grooves. A second strain section is provided on the side clamping plate.

[0012] Preferably, the upper and lower parts of both sides of the side clamping plate are respectively connected to connecting plates, and two connecting fastening plates are installed between the two side clamping plates. The two ends of the connecting fastening plates are respectively connected to the connecting plates on the side clamping plates. A third strain section is provided in the middle of the connecting fastening plate, and a plurality of heat dissipation grooves are provided on the connecting fastening plate.

[0013] Preferably, the first strain section, the second strain section, and the third strain section are all corrugated, and the first strain section, the second strain section, and the third strain section are all made of aluminum alloy.

[0014] Preferably, a positioning block is connected to the top of the battery module, and a plurality of positioning slots adapted to the positioning block on one side of the fastening plate are provided. Heat dissipation holes are provided on one side of the fastening plate and the connecting part, and heat dissipation vents are provided on the fastening mechanism. The heat dissipation vents are provided on the fastening plate and the connecting part.

[0015] Preferably, the mounting mechanism includes a main partition plate connected to the inner bottom surface of the battery pack housing. Several first mounting blocks and second mounting blocks are respectively connected to both sides of the main partition plate. The mounting plate is connected to the first mounting blocks and the second mounting blocks by bolts.

[0016] Preferably, one end of the first mounting block and the second mounting block are connected to a limiting block; the main partition of the mounting mechanism, together with the first mounting block and the second mounting block, divides the battery pack housing into several regions, and several battery modules are respectively disposed in the regions.

[0017] Preferably, a cooling mechanism is installed in the battery pack housing. The cooling mechanism includes several cooling plates, cooling pipes, and circulation pipes. The several cooling plates are installed in several areas separated by the installation mechanism.

[0018] Preferably, the cooling pipeline is connected to a plurality of flow pipes, one end of which is connected to a cooling plate; the circulation pipeline is connected to a plurality of connecting pipes, one end of which is connected to a cooling plate; and one end of the cooling pipeline and the circulation pipeline is connected to a connector, which is connected to an external device.

[0019] Preferably, a control module is connected inside the controller housing, a charging interface is connected to the top of the control module, a chip module is connected inside the controller housing, and a communication port is provided on one side of the controller housing and the battery pack housing to connect the controller housing and the battery pack housing.

[0020] Preferably, the charging interface and the connector are respectively mounted on the controller housing cover, and the cooling pipe and the circulation pipe are connected from the controller housing to the battery pack housing through the connecting port.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This application uses a side plate and a side clamping plate for installation, and then connects and installs a connecting fastening plate to the side clamping plate. When fixing the battery module, the components can be connected and installed one by one, and then the battery module can be installed and fixed. Alternatively, the fixing mechanism can be pre-connected and installed before use, without affecting work efficiency. This solves the problem that the traditional one-piece fixing structure requires the replacement of the entire fixing structure when it is repaired or replaced, which is costly. It helps to reduce maintenance costs and improve work efficiency during maintenance.

[0023] 2. This application provides corresponding heat dissipation measures on the side plate and the connecting fastening plate. Furthermore, the first strain section, the second strain section, and the third strain section of this application are all corrugated, which can also assist the battery module in heat dissipation. This avoids the battery module's heat dissipation efficiency being affected when the battery module is reinforced and fixed. This solves the problem that the heat dissipation efficiency of the battery module is affected when the fixing mechanism covers and reinforces the battery module, which is beneficial to improving the service life of the electronic components inside the casing.

[0024] 3. This application, through the side plate, side clamping plate, and connecting fastening plate, along with the first strain section, second strain section, and third strain section, can deform with the battery module when it undergoes thermal expansion during operation. This prevents the battery module from being subjected to excessive stress due to rigid constraints during thermal expansion and contraction, which could damage the battery module. When not in operation and undergoing cooling contraction, these components will also return to their original positions, maintaining a reinforced fixation of the battery module and preventing it from loosening or shaking. This preserves the integrity of the entire battery pack housing structure and solves the problem that traditional fixing structures lack effective and reasonable countermeasures for thermal expansion and contraction deformation of the battery module caused by environmental temperature changes such as heat generation. This is beneficial to improving the practicality and safety performance of the battery pack housing. Attached Figure Description

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the cooling mechanism structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the battery module and fastening mechanism of the present invention;

[0029] Figure 5 This is a schematic diagram of the fastening mechanism of the present invention;

[0030] Figure 6 This is a schematic diagram of the mating structure of the mounting groove and mounting block of the present invention;

[0031] Figure 7 This is an exploded view of the fastening mechanism of the present invention;

[0032] Figure 8 This is a schematic diagram of the side plate and fastening plate structure of the present invention;

[0033] Figure 9 This is a partial structural diagram of the side clamping plate of the present invention;

[0034] Figure 10 This is a schematic diagram of the connecting fastening plate structure of the present invention.

[0035] Explanation of annotations in the image:

[0036] 1. Battery pack casing; 101. Battery pack casing cover;

[0037] 2. Controller housing; 201. Controller housing cover; 202. Control module; 203. Charging interface; 204. Chip module;

[0038] 3. Battery module; 301. Positioning block;

[0039] 4. Installation mechanism; 401. Main partition; 402. First mounting block; 403. Second mounting block; 404. Limiting block;

[0040] 5. Fastening mechanism; 501. Side plate; 502. Fastening plate; 503. Connecting part; 504. Mounting plate; 505. First strain section; 506. Mounting groove; 507. Side tightening plate; 508. Mounting block; 509. Second strain section; 510. Connecting plate; 511. Connecting fastening plate; 512. Third strain section; 513. Heat dissipation groove; 514. Positioning groove; 515. Heat dissipation hole; 516. Heat dissipation outlet;

[0041] 6. Cooling mechanism; 601. Cooling plate; 602. Cooling pipe; 603. Flow pipe; 604. Circulation pipe; 605. Connecting pipe; 606. Connector. Detailed Implementation

[0042] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0043] Example 1:

[0044] Please see Figures 1 to 2 A new energy battery pack composite material shell includes a battery pack shell 1 and a controller shell 2 connected to one side of the battery pack shell 1. A battery pack shell cover 101 is connected to the top of the battery pack shell 1, and a controller shell cover 201 is connected to the top of the controller shell 2. The battery pack shell 1, the controller shell 2, the battery pack shell cover 101, and the controller shell 201 are all made of composite materials such as reinforcing phase materials and matrix phase materials. By complementing the advantages of different materials, the stringent requirements of the battery pack shell in terms of strength, lightweight, insulation, and weather resistance are met.

[0045] Specifically, the reinforcing phase material is a mixture of glass fiber and carbon fiber in a certain proportion, which can retain the high strength of carbon fiber, reduce costs through glass fiber, and balance insulation.

[0046] Matrix material: Epoxy resin and phenolic resin are blended, which can retain the adhesive properties of epoxy resin and improve the flame retardancy of phenolic resin, thereby improving the strength of the composite shell.

[0047] Functional additives: such as flame retardants, interface modifiers, antioxidants, thermal conductivity additives, etc.

[0048] The battery pack housing 1 contains several battery modules 3. It should be noted that the battery module 3 is not a single cell, but a standardized module formed by combining multiple individual cells in series, parallel or series-parallel hybrid connection. The battery module 3 is the key intermediate layer connecting the individual cells and the entire battery pack. In other words, several individual cells make up the battery module 3, and several battery modules 3 make up the entire battery pack. The inner bottom surface of the battery pack housing 1 is connected to the mounting mechanism 4, and the top of the mounting mechanism 4 is connected to the fastening mechanism 5.

[0049] Please see Figures 4 to 10The fastening mechanism 5 includes a pair of side plates 501 and a fastening plate 502. The pair of side plates 501 are spaced apart. The battery module 3 is disposed between the pair of side plates 501. The connection between the fastening plate 502 and the side plates 501 is a connecting part 503. The width of the connecting part 503 is greater than that of the side plates 501 and the fastening plate 502. The pair of side plates 501 and the fastening plate 502 and the connecting part 503 are integrally formed. The width of the connecting part 503 is greater than that of the side plates 501 and the fastening plate 502. The connecting part 503 covers the stress concentration areas on both sides of the top of the battery module 3 (i.e., the corners of the battery module 3). This is mainly to increase the contact area with the battery module 3, disperse the pressure from the fastening mechanism 5 on the battery module 3, and prevent the fastening mechanism 5 from damaging the corners of the battery module 3.

[0050] A first strain section 505 is provided on the side plate 501, and a mounting plate 504 is connected to the bottom of the side. The mounting plate 504 is connected to the mounting mechanism 4 by bolts. Mounting grooves 506 are respectively opened on the upper and lower sides of the first strain section 505 of the side plate 501, and the two mounting grooves 506 are symmetrically distributed.

[0051] Each of the two side plates 501 is connected to a side clamping plate 507. The upper and lower ends of the side clamping plate 507 are respectively connected to mounting blocks 508. The two mounting blocks 508 are symmetrically distributed and are engaged with the mounting groove 506. A second strain section 509 is provided on the side clamping plate 507.

[0052] When installing the fastening mechanism 5, insert one of the mounting blocks 508 of the side fastening plate 507 into the corresponding mounting slot 506 on the side plate 501, and then insert the other mounting block 508 into the other mounting slot 506. It should be noted that when installing the other mounting block 508, due to the size of the side fastening plate 507, it is necessary to slightly bend one side of the side fastening plate 507 to deform it briefly so that the other mounting block 508 can be placed into the mounting slot 506. Then, when the mounting block 508 enters the mounting slot 506, it will automatically reset and return to its original shape without deformation. This completes the installation of the side fastening plate 507.

[0053] Subsequently, the side plate 501, the fastening plate 502, and the side clamping plate 507 are covered on the outside of the battery module 3. When the mounting plate 504 contacts the first mounting block 402 and the second mounting block 403, the mounting plate 504 is connected and fixed to the mounting mechanism 4 by bolts, so as to install and fix the side plate 501, the fastening plate 502, and the side clamping plate 507.

[0054] At this time, the side plate 501 is reinforced and fixed to one of the two sides of the battery module 3, and the bottom of the fastening plate 502 is reinforced and fixed to the top of the battery module 3.

[0055] Next, the connecting fastening plate 511 is inserted between the connecting plate 510 on the side clamping plate 507 and one side of the battery module 3, and the connecting fastening plate 511 and the connecting plate 510 are connected and installed with bolts. At this point, the side plate 501, fastening plate 502, side clamping plate 507, and connecting fastening plate 511 of the fixing mechanism 5 are all connected and installed together. Moreover, the two connecting fastening plates 511 and the two side clamping plates 507 cooperate to strengthen and fix the outside of the battery module 3, and connect the battery module 3 and the fixing mechanism 5 into a whole. This avoids the problem that the battery module 3 is not securely connected to the fixing structure 5, and the battery module 3 is prone to shaking during vehicle driving, which affects the normal operation of the battery pack.

[0056] Connecting plates 510 are connected to the upper and lower parts of both sides of the side clamping plate 507. Two connecting fastening plates 511 are installed between the two side clamping plates 507. The two ends of the connecting fastening plates 511 are connected to the connecting plates 510 on the side clamping plates 507 respectively. A third strain section 512 is provided in the middle of the connecting fastening plate 511. Several heat dissipation slots 513 are opened on the connecting fastening plate 511. It should be further added that when the fastening mechanism 5 is installed, the fastening plate 502 is positioned and installed by the positioning block 301 on the battery module 3. Specifically, the positioning slot 514 on the fastening plate 502 cooperates with the positioning block 301 for positioning.

[0057] More specifically, the heat dissipation vents 516 and 515 on the fastening plate 502 can assist the battery module 3 in heat dissipation. The heat dissipation channel 513 on the fastening plate 511, as well as the first strain section 505 and the third strain section 512, can also assist the battery module 3 in heat dissipation, so as to avoid affecting the heat dissipation efficiency of the battery module 3 when the fastening mechanism 5 covers and strengthens the fixation of the battery module 3.

[0058] More specifically, because there is a gap of side plate 501 between the side plate 507 and the battery module 3, the side plate 507 will not affect the heat dissipation of the battery module 3.

[0059] The first strain section 505, the second strain section 509, and the third strain section 512 are all corrugated and made of aluminum alloy. They can provide reliable fastening for the battery module 3 and release stress by plastic deformation when subjected to thermal expansion and contraction stress of the battery module 3. When the battery module 3 is working, thermal expansion and contraction occurs. Specifically, the battery module 3 generates heat during charging and discharging, and the temperature rises, causing thermal expansion. It will contract in low temperature environments or when it stops working and cools down.

[0060] It is important to note that the amount of deformation caused by thermal expansion and contraction of battery module 3 is minute but not negligible. This is because, although the absolute size change of battery module 3 during thermal expansion and contraction seems small, new energy battery packs are extremely sensitive to size changes and stress in the casing. Moreover, such changes will accumulate repeatedly in long-term cycles, which may eventually lead to structural damage, performance degradation, or even safety accidents. Therefore, although the absolute amount of deformation caused by thermal expansion and contraction is small, it has a significant impact on the reliability and safety of battery module 3.

[0061] The battery module 3 generates heat during charging and discharging, and the temperature rises, causing thermal expansion. It will contract when it is in a low temperature environment or when it stops working and cools down. During these changes, the fastening mechanism 5 will also change accordingly. Specifically, the fastening mechanism 5 adapts to the changes through the first strain section 505, the second strain section 509, and the third strain section 512.

[0062] More specifically, because the first strain section 505, the second strain section 509, and the third strain section 512 are all corrugated and made of aluminum alloy, this corrugated structure, combined with the aluminum alloy material, has a certain degree of elasticity. When the battery module 3 expands, the corrugated structure can be stretched to provide space for the expansion of the battery module 3 and absorb the dimensional changes caused by the thermal expansion of the battery module 3. When the battery module 3 contracts, the corrugated structure can be reset and tightened to compensate for the gaps caused by the contraction of the battery module 3, thereby preventing the battery module 3 from being subjected to excessive stress due to rigid constraints during thermal expansion and contraction, which could damage the battery module 3 or the fastening mechanism 5.

[0063] More specifically, during thermal expansion, the first strain section 505 will first undergo adaptive stretching. At this time, the mounting grooves 506 on both sides of the first strain section 505 will also drive the side tension plate 507 to undergo adaptive deformation, which in turn drives the second strain section 509 to undergo adaptive stretching. When the side tension plate 507 deforms, it will drive the connecting plate 510 to generate a deformation force. This force will be transmitted to the connecting fastening plate 511, causing the third strain section 512 on the connecting fastening plate 511 to undergo adaptive stretching, thereby preventing problems such as loosening of the connection between the connecting plate 510 and the connecting fastening plate 511. Similarly, during cold contraction, the first strain section 505, the second strain section 509, and the third strain section 512 will reset and tighten, thereby coping with the deformation of the battery module 3 during thermal expansion and contraction and avoiding excessive stress.

[0064] A positioning block 301 is connected to the top of the battery module 3. A number of positioning slots 514 adapted to the positioning block 301 on the side of the fastening plate 502 are provided. Heat dissipation holes 515 are provided on one side of the fastening plate 502 and the connecting part 503 respectively. Heat dissipation vents 516 are provided on the fastening mechanism 5. The heat dissipation vents 516 are provided on the fastening plate 502 and the connecting part 503.

[0065] Please see Figure 3 The mounting mechanism 4 includes a main partition 401, which is connected to the inner bottom surface of the battery pack housing 1. Several first mounting blocks 402 and second mounting blocks 403 are respectively connected to both sides of the main partition 401. The mounting plate 504 is connected to the first mounting blocks 402 and second mounting blocks 403 by bolts. During the arrangement, the main partition 401 is first welded to the inner bottom surface of the battery pack housing 1, and the main partition 401 is in the middle of the battery pack housing 1. During the manufacturing process, the main partition 401 is welded by an automated positioning welding device. Then, the first mounting blocks 402 and second mounting blocks 403 are welded. The first mounting blocks 402 and second mounting blocks 403 are arranged on both sides of the main partition 401 and welded to the inner bottom surface of the battery pack housing 1.

[0066] Then, the cooling mechanism 6 is arranged and installed;

[0067] It should be further added that at this time, the main partition 401, together with several first mounting blocks 402 and second mounting blocks 403 and limiting blocks 404, divides the battery pack housing 1 into several areas. During installation, the battery module 3 is installed in these divided areas. The bottom of the battery module 3 is positioned in four directions by the main partition 401, several first mounting blocks 402 and second mounting blocks 403 and limiting blocks 404. At this time, the battery module 3 is located on the cooling plate 601.

[0068] It is important to note that a thermally conductive silicone pad is provided between the battery module 3 and the cooling plate 601. The thermally conductive silicone pad uses silicone rubber as the base to provide elasticity, and is filled with thermally conductive fillers (such as alumina, boron nitride, graphene, etc.) to form an elastic base plus a thermally conductive network structure. This allows it to not only meet the deformation of the battery module 3 when it expands and contracts with temperature, but also transfer the heat of the battery module 3 to the cooling plate 601 for heat dissipation, without hindering the normal heat dissipation of the battery module 3.

[0069] One end of the first mounting block 402 and the second mounting block 403 are both connected to a limiting block 404; the main partition 401 of the mounting mechanism 4, together with the first mounting block 402 and the second mounting block 403, divides the battery pack housing 1 into several areas, and several battery modules 3 are respectively arranged in the areas.

[0070] Please see Figure 3A cooling mechanism 6 is installed in the battery pack housing 1. The cooling mechanism 6 includes several cooling plates 601, cooling pipes 602, and circulation pipes 604. Several cooling plates 601 are installed in several areas separated by the mounting mechanism 4. During the installation, the cooling plates 601 are first installed in the area separated by the main partition 401, several first mounting blocks 402, second mounting blocks 403, and limiting blocks 404 (i.e., the bottom of the battery module 3 after installation). Then, the flow pipes 603 on the cooling pipes 602 and the connecting pipes 605 on the circulation pipes 604 are connected to the corresponding interfaces on the cooling plates 601.

[0071] It is important to note that the cooling plate 601 also has specific coolant flow channels. Therefore, the flow pipe 603 and the connecting pipe 605 need to be connected to the corresponding interfaces on the cooling plate 601 respectively. They cannot be connected in reverse or incorrectly.

[0072] Several flow pipes 603 are connected to the cooling pipe 602. One end of the flow pipe 603 is connected to the cooling plate 601. Several connecting pipes 605 are connected to the circulation pipe 604. One end of the connecting pipe 605 is connected to the cooling plate 601. One end of the cooling pipe 602 and the circulation pipe 604 is connected to a connector 606. The connector 606 is connected to an external device and to the circulation system device in the vehicle. The circulation system device circulates the coolant. After absorbing the heat generated by the battery module 3, the coolant temperature rises and flows into the circulation system device through the connector 606 of the circulation pipe 604. Subsequently, the high-temperature coolant exchanges heat with the outside air and dissipates the heat into the atmosphere. The cooled coolant flows back into the cooling pipe 602 through the circulation system device and enters the cooling plate 601 to continue to dissipate heat. The circulation system device is a known technology, and those skilled in the art can and should understand its specific functions and structure, so it will not be described in detail here.

[0073] When the battery module 3 in the battery pack housing 1 is working normally, it will generate heat, which needs to be dissipated by the cooling mechanism 6. Specifically, the coolant is delivered to each flow pipe 603 through the cooling pipe 602, so that the coolant enters the cooling plate 601 through the flow pipe 603. At this time, the coolant flows in the cooling plate 601 to absorb the heat generated by the battery module 3 during operation.

[0074] The coolant, heated by absorbing heat, flows to the connecting pipe 605, then enters the circulation pipe 604 and flows to the corresponding connector 606. The heated coolant then flows to the vehicle's circulation system for heat dissipation, and re-enters the cooling pipe 602 through the connector 606, thus achieving coolant circulation and continuously absorbing the heat generated by the battery module 3 during operation, thereby dissipating heat from the battery module 3.

[0075] The controller housing 2 is internally connected to a control module 202. The top of the control module 202 is connected to a charging interface 203. The controller housing 2 is internally connected to a chip module 204. A communication port is provided on one side of the controller housing 2 and the battery pack housing 1 to connect the controller housing 2 and the battery pack housing 1.

[0076] The charging interface 203 and the connector 606 are respectively installed on the controller housing 201, and the cooling pipe 602 and the circulation pipe 604 are connected from the controller housing 2 to the battery pack housing 1 through the connecting port.

[0077] When using this device, one of the mounting blocks 508 of the side clamping plate 507 is inserted into the corresponding mounting slot 506 on the side plate 501, and then the other mounting block 508 is inserted into the other mounting slot 506. It should be noted that when installing the other mounting block 508, due to the size of the side clamping plate 507, one side of the side clamping plate 507 needs to be slightly bent to deform it briefly so that the other mounting block 508 can be placed into the mounting slot 506. Then, when the mounting block 508 enters the mounting slot 506, it will automatically reset and return to its original shape without deformation. This completes the installation of the side clamping plate 507.

[0078] Subsequently, the side plate 501, the fastening plate 502, and the side clamping plate 507 are covered on the outside of the battery module 3. When the mounting plate 504 contacts the first mounting block 402 and the second mounting block 403, the mounting plate 504 is connected and fixed to the mounting mechanism 4 by bolts, so as to install and fix the side plate 501, the fastening plate 502, and the side clamping plate 507.

[0079] Next, the connecting fastening plate 511 is inserted between the connecting plate 510 on the side clamping plate 507 and one side of the battery module 3, and the connecting fastening plate 511 and the connecting plate 510 are connected and installed by bolts. At this point, the side plate 501, fastening plate 502, side clamping plate 507 and connecting fastening plate 511 of the fixing mechanism 5 are all connected and installed together. Moreover, the two connecting fastening plates 511 and the two side clamping plates 507 cooperate to strengthen and fix the outside of the battery module 3, and connect the battery module 3 and the fixing mechanism 5 into a whole.

[0080] Then, during the charging and discharging process, the battery module 3 generates heat, which causes thermal expansion due to the increased temperature. Conversely, it contracts when cooled down in low-temperature environments or after stopping operation. During these changes, the fastening mechanism 5 also changes accordingly. Specifically, the fastening mechanism 5 adapts to these changes through the first strain section 505, the second strain section 509, and the third strain section 512. Because the first strain section 505, the second strain section 509, and the third strain section 512 are all corrugated and made of aluminum alloy, this corrugated structure, combined with the aluminum alloy material, has a certain degree of elasticity. When the battery module 3 expands, the corrugated structure can be stretched to provide space for the expansion of the battery module 3 and absorb the dimensional changes caused by thermal expansion. When the battery module 3 contracts, the corrugated structure can return to its original position and tighten to compensate for the gaps caused by the contraction of the battery module 3. This prevents the battery module 3 from being subjected to excessive stress due to rigid constraints during thermal expansion and contraction, which could damage the battery module 3 or the fastening mechanism 5.

[0081] Finally, during thermal expansion, the first strain section 505 will first undergo adaptive stretching. At this time, the mounting grooves 506 on both sides of the first strain section 505 will also drive the side tension plate 507 to undergo adaptive deformation, which in turn drives the second strain section 509 to undergo adaptive stretching. When the side tension plate 507 deforms, it will drive the connecting plate 510 to generate a deformation force. This force will be transmitted to the connecting fastening plate 511, causing the third strain section 512 on the connecting fastening plate 511 to undergo adaptive stretching, thereby preventing problems such as loose connection between the connecting plate 510 and the connecting fastening plate 511. Similarly, during cold contraction, the first strain section 505, the second strain section 509, and the third strain section 512 will reset and tighten, thereby coping with the deformation of thermal expansion and contraction during the operation of the battery module 3 and avoiding excessive stress.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite material housing for a new energy battery pack, comprising a battery pack housing (1) and a controller housing (2) connected to one side of the battery pack housing (1), wherein a battery pack cover (101) is connected to the top of the battery pack housing (1), a controller cover (201) is connected to the top of the controller housing (2), and a plurality of battery modules (3) are installed in the battery pack housing (1), characterized in that: The inner bottom surface of the battery pack housing (1) is connected to an installation mechanism (4), and the top of the installation mechanism (4) is connected to a fastening mechanism (5). The fastening mechanism (5) includes a pair of side plates (501) and a fastening plate (502). The battery module (3) is disposed between the pair of side plates (501). The two sides of the fastening plate (502) are respectively connected to the top of the two side plates (501). The connection between the fastening plate (502) and the side plate (501) is a connecting part (503). The width of the connecting part (503) is greater than that of the side plate (501) and the fastening plate (502). The side plate (501) is provided with a first strain section (505), and the bottom of the side is connected to a mounting plate (504). The first strain section (505) of the side plate (501) is provided with mounting grooves (506) on the upper and lower sides respectively, and the two mounting grooves (506) are symmetrically distributed. Each of the two side plates (501) is connected to a side clamping plate (507). The upper and lower ends of the side clamping plate (507) are respectively connected to mounting blocks (508). The two mounting blocks (508) are symmetrically distributed. The mounting blocks (508) are engaged with the mounting groove (506). A second strain section (509) is provided on the side clamping plate (507).

2. The composite material housing for a new energy battery pack according to claim 1, characterized in that: Connecting plates (510) are respectively connected to the upper and lower parts of the two sides of the side clamping plate (507). Two connecting fastening plates (511) are installed between the two side clamping plates (507). The two ends of the connecting fastening plates (511) are respectively connected to the connecting plates (510) on the side clamping plate (507). A third strain section (512) is provided in the middle of the connecting fastening plate (511). Several heat dissipation slots (513) are opened on the connecting fastening plate (511).

3. The composite material housing for a new energy battery pack according to claim 1, characterized in that: The first strain section (505), the second strain section (509), and the third strain section (512) are all corrugated, and the first strain section (505), the second strain section (509), and the third strain section (512) are all made of aluminum alloy.

4. The composite material housing for a new energy battery pack according to claim 1, characterized in that: The top of the battery module (3) is connected to a positioning block (301). A plurality of positioning slots (514) adapted to the positioning block (301) on one side of the fastening plate (502) are provided. Heat dissipation holes (515) are provided on one side of the fastening plate (502) and the connecting part (503). Heat dissipation vents (516) are provided on the fastening mechanism (5). The heat dissipation vents (516) are provided on the fastening plate (502) and the connecting part (503).

5. The composite material housing for a new energy battery pack according to claim 1, characterized in that: The mounting mechanism (4) includes a main partition (401), which is connected to the inner bottom surface of the battery pack housing (1). Several first mounting blocks (402) and second mounting blocks (403) are respectively connected to both sides of the main partition (401). The mounting plate (504) is connected to the first mounting blocks (402) and the second mounting blocks (403) by bolts.

6. The composite material housing for a new energy battery pack according to claim 5, characterized in that: One end of the first mounting block (402) and the second mounting block (403) are connected to a limiting block (404); the main partition (401) of the mounting mechanism (4), together with the first mounting block (402) and the second mounting block (403), divides the battery pack housing (1) into several regions, and several battery modules (3) are respectively disposed in the regions.

7. The composite material housing for a new energy battery pack according to claim 1, characterized in that: A cooling mechanism (6) is installed in the battery pack housing (1). The cooling mechanism (6) includes several cooling plates (601), cooling pipes (602), and circulation pipes (604). The several cooling plates (601) are installed in several areas separated by the mounting mechanism (4).

8. The composite material housing for a new energy battery pack according to claim 7, characterized in that: The cooling pipe (602) is connected to several flow pipes (603), one end of which is connected to the cooling plate (601). The circulation pipe (604) is connected to several connecting pipes (605), one end of which is connected to the cooling plate (601). One end of the cooling pipe (602) and the circulation pipe (604) is connected to a connector (606), which is connected to an external device.

9. The composite material housing for a new energy battery pack according to claim 1, characterized in that: The controller housing (2) is internally connected to a control module (202), the top of the control module (202) is connected to a charging interface (203), the controller housing (2) is internally connected to a chip module (204), and a communication port is provided on one side of the controller housing (2) and the battery pack housing (1) to connect the controller housing (2) and the battery pack housing (1).

10. A composite material housing for a new energy battery pack according to claim 9, characterized in that: The charging interface (203) and the connector (606) are respectively installed on the controller housing cover (201), and the cooling pipe (602) and the circulation pipe (604) are connected from the controller housing (2) to the battery pack housing (1) through the communication port.

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