Battery pack structure

Abstract

A battery pack structure, characterized by comprising: a housing (10), the housing (10) having a first cavity (101) arranged to receive a battery module and a second cavity (102) arranged along a first direction on one side of the first cavity (101); and a BMS (20) and a BDU (30), wherein the BDU (30) is arranged within the second cavity (102) and the BMS (20) is arranged outside the second cavity (102) and is connected to a bottom plate of the housing (10).

Description

[0001] This application claims priority to the Chinese patent application filed on August 28, 2024, with the Chinese Patent Office under application number 2024221073196, the entire contents of which are incorporated into this application by reference. Technical field

[0002] The present application relates to the technical field of batteries and, in particular, to a battery pack structure. State of the art

[0003] The battery management system (BMS) and the battery distribution unit (BDU) are critical components of the battery system in new energy electric vehicles. In the battery system, the BMS and BDU work together. The BMS monitors the battery status and issues control instructions, while the BDU rationally distributes and controls power according to these instructions to ensure the stable and safe operation of the entire battery system. To ensure its quality and integrity, the BMS must also undergo rigorous testing. This includes simulating battery behavior and testing its response under various conditions. Contents of this applicationTECHNICAL PROBLEM

[0004] Currently, the traditional BMS maintenance design usually requires dismantling the battery pack during maintenance and opening the battery pack cover to repair the BMS inside the battery pack. However, dismantling the battery pack is laborious, especially when the battery pack is installed in the vehicle body. Because the battery pack itself is relatively bulky, the work steps of dismantling the battery pack to repair the BMS are laborious and time-consuming.

[0005] As can be seen from the above, the current battery pack has the problem that the maintenance of the battery pack is inconvenient due to the degradation process. TECHNICAL SOLUTIONS

[0006] In a first aspect, the present application provides a battery pack structure comprising a housing having a first cavity arranged to receive a battery module and a second cavity arranged along a first direction on one side of the first cavity, and a BMS and a BDU, wherein the BDU is arranged within the second cavity and the BMS is arranged outside the second cavity and is connected to a bottom plate of the housing. TECHNICAL IMPACTS

[0007] The advantageous effect of the present application is that, with the technical solution of the present application, the BMS is mounted on the lower surface of the case exterior in the battery pack structure of the present application. Therefore, when the BMS needs to be repaired, the battery pack structure does not need to be disassembled, and the BMS mounted on the outside of the case can be directly repaired. This simplifies overall maintenance, saves time and effort, and improves maintenance efficiency. The BMS mounted on the outside of the case of the present application eliminates the need to disassemble the battery pack and then repair the BMS inside the battery pack structure, as in the prior art. Short description of the drawing Fig. 1 shows a schematic representation of a three-dimensional structure of a battery pack structure of the present application; Fig. 2 shows another schematic representation of a three-dimensional structure of the battery pack structure of the present application; Fig. 3 shows a schematic representation of the three-dimensional structure of the battery pack structure of the present application without a cover plate; Fig. 4 shows an enlarged view of section A in Fig. 3; Fig. 5 shows a schematic structural diagram of a first cavity and a second cavity of a battery pack structure of the present application; Fig. 6 shows an enlarged view of section B in Fig. 5; Fig. 7 shows a schematic diagram of a three-dimensional structure of a BMS installed on a mounting plate of the present application; Fig. 8 shows an enlarged view of section C in Fig. 7; Fig. 9 is a schematic diagram showing the installation structure of the mounting plate of the present application; Fig. 10 shows an enlarged view of section D in Fig. 9; Fig. 11 shows a schematic diagram of the connection of the connector and the sealing element of the present application.

[0008] In the drawings: 10. Housing; 101. First cavity; 102. Second cavity; 103. Mounting groove; 104. Wiring hole; 110. Outer frame; 120. Cover plate; 130. Mounting plate; 131. Mounting channel; 140. Partition plate; 150. Back plate; 20. BMS; 30. BDU; 40. Terminal; 50. Protection plate; 60. Maintenance plate; 70. Reinforcement beam; 80. Wire harness; 90. Sealing element. Detailed description of the embodiments

[0009] In order to solve the problem in the prior art that the battery pack needs to be disassembled when repairing the BMS, which leads to inconvenience in operation, the present application provides a battery pack structure.

[0010] The battery pack structure in this embodiment includes a housing 10, a battery module, a battery management system (BMS) 20, and a battery distribution unit (BDU) 30. The battery pack structure operates cooperatively via BMS 20 and BDU 30. BMS 20 monitors the battery status and issues control instructions, while BDU 30 rationally distributes and controls the power according to these instructions to ensure the stable and safe operation of the entire battery system.

[0011] In this embodiment, the battery pack structure can be installed on the vehicle body as an electrical power source to supply power to the vehicle.

[0012] As in the Fig. 1 and Fig. As shown in Figure 11, the battery pack structure includes a housing 10, a BMS20, and a BDU30. The housing 10 has a first cavity 101 arranged to receive a battery module, and a second cavity 102 arranged along a first direction on one side of the first cavity 101. The BDU30 is arranged within the second cavity 102, and the BMS20 is arranged outside the second cavity 102 and connected to the bottom plate of the housing 10.

[0013] The battery module, BMS20, and BDU30 are arranged within the same housing 10. Both BMS20 and BDU30 are connected to the battery module to enable monitoring and control of the battery module by BMS20 and BDU30 for stable and safe operation of the battery module.

[0014] In this embodiment, the housing 10 is a metal housing to protect the battery module, BMS 20 and BDU 30 inside the housing 10, and also to facilitate mounting to a location to be mounted, e.g., to a vehicle body.

[0015] In particular, the interior of the housing 10 is divided into two cavities arranged along a first direction, each arranged to accommodate a battery module and a BDU30 connected to the battery module. The two cavities are arranged to separate the battery module and the BDU30 from each other to facilitate subsequent maintenance and improve operational reliability.

[0016] In this embodiment, the battery pack structure has the BMS20 arranged at the bottom of the outer side of the casing 10. Therefore, when the BMS20 needs to be repaired, the battery pack structure does not need to be disassembled, and the BMS20 mounted on the outer side of the casing 10 can be directly repaired. This simplifies the entire maintenance process, saves time and effort, and improves maintenance efficiency. The BMS20 mounted on the outer side of the casing of the present application eliminates the need to disassemble the battery pack during repair and then repair the BMS20 inside the battery pack structure, as in the prior art.

[0017] The first direction is the length direction of the housing 10, as shown in Fig. 1, the second direction is the width direction of the housing 10, as shown in Fig. 1, and the third direction is the height direction of the housing 10, as shown in Fig. 1 shown.

[0018] As in the Fig. 3 to Fig. 6, the bottom plate of the second cavity 102 is a mounting plate 130, and the BDU 30 and the BMS 20 are respectively arranged along the height direction of the housing 10 on two opposite sides of the mounting plate 130.

[0019] In particular, the BMS20 is arranged below the BDU30, so that the assembly with control function is mounted on the same side of the battery module, which facilitates the overall structural design and has a positive impact on the structural design of the battery pack structure. At the same time, the placement of the BMS20 on one side of the battery module also contributes to improving operational reliability.

[0020] In this embodiment, the BMS20 is detachably mounted on the mounting plate 130. Specifically, the mounting plate 130 has a mounting hole, the BMS20 has a through-hole, and a fastener passes through the through-hole on the BMS20 and extends into the interior of the mounting hole to firmly hold the BMS20. The BMS20 is detachably attached to the mounting plate 130 by engaging the fastener with the mounting hole. The mounting hole is a threaded hole, and the fastener is a screw. The BMS20 is attached to the mounting plate 130 by screwing the screws into the threaded holes.

[0021] In this embodiment, the BMS 20 includes at least a main board and a slave board. Both the main board and the slave board are mounted on the mounting plate 130, and both the main board and the slave board are connected to the connector 40 via a wiring harness 80.

[0022] Optionally, a plurality of mounting holes are arranged, and the plurality of mounting holes cooperate with the through holes on the BMS 20 to improve the stability of the connection between the BMS 20 and the mounting plate 130.

[0023] As in the Fig. 3 to Fig. As shown in Figure 6, a reinforcement beam 70 is disposed on the upper surface of the mounting plate 130, and the BDU 30 is disposed on the reinforcement beam 70. Disposing the reinforcement beam 70 on the mounting plate 130 not only enables the mounting of the BDU 30 but also improves the mounting strength and the stability of the battery pack structure.

[0024] The reinforcing beam 70 is disposed within the second cavity 102 and extends along the second direction to improve the strength of the mounting plate 130 in the second direction and to prevent deformation of the bottom of the second cavity 102 in the second direction.

[0025] In order to further improve the strength of the mounting plate 130 and the stability of the attachment of the BDU 30, a plurality of reinforcing beams 70 are arranged at intervals along the first direction, and the plurality of reinforcing beams 70 are arranged between the BDU 30 and the mounting plate 130 to provide a plurality of installation positions and thereby improve the stability of the attachment of the BDU 30.

[0026] In this embodiment, the reinforcement beam 70 is welded to the mounting plate 130, and the welding serves to fix the reinforcement beam 70 to the reinforcement plate, which facilitates operation and promotes the stability of the fixing of the reinforcement beam 70.

[0027] Optionally, the reinforcement beam 70 is welded to the mounting plate 130 by friction welding.

[0028] As in Fig. 9 and Fig. 10, a mounting channel 131 is arranged on the mounting plate 130, which extends along the height direction of the housing 10, and the mounting channel 131 provides a mounting space.

[0029] In particular, the battery pack structure also includes a terminal 40 and a wire harness 80. The terminal 40 is inserted into the interior of the mounting channel 131. One end of the terminal 40, which is exposed outside the housing 10, is connected to the BMS 20 via the wire harness 80, and another end of the terminal 40, which is located inside the housing 10, is arranged to be connected to the battery module.

[0030] In this embodiment, one end of the terminal 40, which is located outside the housing 10 along the height direction of the housing 10, is exposed, and another end of the terminal 40 is located inside the second cavity 102. The terminal 40 is protruded inside the mounting channel 131. The terminal 40 is electrically connected to the BMS 20 via the wire harness 80, and the other end of the terminal 40, that is, the end located inside the second cavity 102, is electrically connected to the battery module.

[0031] As in Fig. 11, the battery pack structure further includes a sealing member 90, at least a portion of which is disposed between the mounting channel 131 and the terminal 40.

[0032] In particular, the sealing element 90 is arranged to seal the gap between the mounting channel 131 and the terminal, thereby achieving a water and dustproof effect to prevent water and dust from entering the interior of the housing 10 through the mounting channel 131.

[0033] Optionally, the sealing element 90 is a plastic strip, and the sealing element 90 is firmly connected to the mounting plate 130 by means of a fastening element. The sealing strip not only achieves a sealing effect but also has the function of limiting and fixing the connection 40.

[0034] In this embodiment, the mounting plate 130 has a bending portion raised toward the inside of the second cavity 102, and a mounting groove 103 is formed in the bending portion along the height direction of the housing 10 with an opening orientation facing away from the BDU 30. The BMS 20 and the wiring harness 80 are arranged within the mounting groove 103.

[0035] As in the Fig. 7 to 10, the mounting plate 130 forms a mounting groove 103, and the BMS20 and the wire harness 80 are arranged inside the mounting groove 103, so that the BMS20 and the wire harness 80 are installed in the mounting groove 103 to obtain a protective effect, thereby preventing the BMS20 and the wire harness 80 from protruding from the mounting groove 103, so that the BMS20 and the wire harness 80 are easily damaged by a collision.

[0036] Specifically, the battery pack structure further includes a maintenance plate 60 detachably connected to the mounting plate 130, and the maintenance plate 60 blocks the opening of the mounting groove 103. Attaching the maintenance plate 60 to the opening of the mounting groove 103 enables the BMS20 to be protected within the mounting groove 103. When the BMS20 needs to be maintained, only the maintenance plate 60 needs to be disassembled to expose the BMS20, which is convenient and easy to perform maintenance, and contributes to saving time and effort and improving maintenance efficiency.

[0037] Optionally, the battery pack structure further includes a protective plate 50 removably disposed outside the first cavity 101 and connected to the bottom of the housing 10. The bottom of the maintenance plate 60 is coplanar with the bottom of the protective plate 50.

[0038] In this embodiment, the protective effect on the bottom of the housing 10 is achieved by attaching the protective plate 50 to prevent impacts or other external forces from damaging the housing 10 and thus affecting the components inside the housing 10, for example, to prevent the battery module from being damaged by external forces. The coplanar arrangement of the protective plate 50 and the maintenance plate 60 facilitates installation and improves the aesthetics of the overall structure. The coplanar arrangement of the protective plate 50 and the maintenance plate 60 prevents the occurrence of uneven surfaces on the bottom of the housing 10, which could lead to damage to the plates.

[0039] In this embodiment, the battery pack structure also includes a sealing strip disposed between the maintenance plate 60 and the mounting plate 130. By disposing the sealing strip between the maintenance plate 60 and the mounting plate 130, the maintenance plate 60 is tightly installed on the mounting plate 130. The sealing strip is configured to prevent water and dust from entering the interior of the mounting groove 103 and contributes to improving the stability of the installation of the maintenance plate 60. At the same time, the sealing strip is disposed between the protective plate 50 and the housing 10. By disposing the sealing strip between the protective plate 50 and the housing 10, a sealed connection is achieved between the protective plate 50 and the housing 10, which contributes to improving the stability of the installation of the protective plate 50.

[0040] Specifically, the maintenance plate 60 and the sealing member 90 are connected to the mounting plate 130 by means of members such as bolts, that is, the members such as bolts pass through the maintenance plate 60 and the sealing strip and are connected to the mounting plate 130, so as to facilitate disassembly when the BMS20 needs to be repaired and to facilitate installation after the repair is completed, which has a positive effect on the efficiency of maintenance work; similarly, the protection plate 50 and the sealing strip are connected to the housing 10 by means of members such as bolts, that is, the members such as bolts pass through the protection plate 50 and the sealing strip and are connected to the housing 10, so as to facilitate disassembly when necessary.

[0041] The maintenance plate 60 of the present application corresponds to the mounting plate 130, so that when the BMS 20 needs to be repaired, only the maintenance plate 60 needs to be disassembled to perform the repair of the BMS 20.

[0042] As in the Fig. 1 to 11, the housing 10 in this embodiment includes an outer frame 110, a back plate 150, a mounting plate 130, and a cover plate 120. The back plate 150 and the mounting plate 130 are arranged at the lower opening of the outer frame 110. The back plate 150 is arranged to support the battery module, the BMS20 and the BDU30 are arranged on the mounting plate 130, and the cover plate 120 is arranged at the upper opening of the outer frame 110.

[0043] Specifically, the outer frame 110 is formed by a frame formed by connecting the top and bottom, and the back plate 150 is welded and fixed to the bottom opening of the outer frame 110 to support the battery module and provide a larger installation space for the battery module. At the same time, the BMS20 and BDU30 are installed on the mounting plate 130 to facilitate maintenance of the BMS20 at the bottom.

[0044] Optionally, the cover plate 120 is arranged at the upper opening of the outer frame 110 to cover the battery module and the BDU30. The cover plate 120, the outer frame 110, the back plate 150, and the mounting plate 130 together define the inner cavity of the housing 10.

[0045] To ensure the sealing of the area covered by the cover plate 120, in this embodiment, a sealing ring is additionally arranged between the upper surface of the cover plate 120 and the outer frame 110. The provision of the sealing ring contributes to achieving a waterproof and dustproof effect in the contact area between the cover plate 120 and the outer frame 110, and at the same time can also improve the stability of the installation of the cover plate 120.

[0046] In this embodiment, the cover plate 120 is connected to the outer frame 110 by bolts to achieve a detachable connection.

[0047] In this embodiment, the back plate 150 and the outer frame 110 as well as the mounting plate 130 and the outer frame 110 are optionally friction welded.

[0048] To facilitate wiring, the outer frame 110 in this embodiment has a wiring hole 104 opening into the second cavity 102 for guiding the wire harness 80 inside the housing 10 out of the housing 10. To prevent water and dust from entering the interior of the second cavity 102 through the wiring hole 104, a sealing ring and a cover body are arranged in this embodiment, corresponding to the wiring hole 104. The sealing ring is arranged on the inner wall of the wiring hole 104, and the cover body is detachably arranged on the wiring hole 104, so that the wiring hole can be covered by the cover body when wiring is not required.

[0049] As in the Fig.3 to 6, the housing 10 also includes a partition 140 connected to the outer frame 110. The partition 140 is arranged along the first direction between the mounting plate 130 and the back plate 150. The partition 140 extends toward the cover plate 120. The partition 140 divides the internal cavity of the housing 10 into a first cavity 101 and a second cavity 102, which are arranged along the first direction on both sides of the partition 140.

[0050] In particular, the partition wall 140 is arranged to divide the inner cavity of the housing 10 into a first cavity 101 and a second cavity 102, thereby separating the battery module and the BDU 30.

[0051] In this embodiment, during the assembly process, the mounting plate 130 is first fixed to the outer frame 110 by friction welding, thereby forming the mounting plate 130 as the bottom plate of the second cavity 102. A reinforcement beam 70 is then welded to the upper surface of the mounting plate 130. The reinforcement beam 70 is arranged to secure the BDU 30 and reinforce the mounting plate 130. The connector 40 and the sealing element 90 are then connected and installed on the mounting channel 131. The sealing element 90 is secured by screws to retain the connector 40 by means of the fastener and to seal the mounting channel 131.Then, the BMS 20 is installed on the bottom of the mounting plate 130, and the electrical connection between the BMS 20 and the terminal 40 is realized by the wire harness, and the electrical connection between the terminal 40 and the battery module is realized by the other wire harness 80. Finally, the maintenance plate 60 is arranged at the opening of the mounting groove 103 to cover the BMS 20. The BMS 20 can be exposed for maintenance by removing the maintenance plate 60 during maintenance.

[0052] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0053] In the battery pack structure of the present application, the BMS20 is arranged on the underside of the exterior of the housing 10, so that when the BMS20 needs to be repaired, the battery pack structure does not need to be disassembled. The BMS20 placed on the exterior of the housing 10 can be directly repaired, simplifying the entire maintenance process, saving time and effort, and improving maintenance efficiency. By installing the BMS20 on the exterior of the housing 10, the inconvenient situation of having to disassemble the battery pack before servicing the BMS20 inside the battery pack is avoided. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 2024221073196

[0001]

Claims

[1] A battery pack structure, characterized by comprising: a housing (10), the housing (10) having a first cavity (101) arranged to receive a battery module and a second cavity (102) arranged along a first direction on one side of the first cavity (101); and a BMS (20) and a BDU (30), wherein the BDU (30) is arranged within the second cavity (102) and the BMS (20) is arranged outside the second cavity (102) and is connected to a bottom plate of the housing (10). [2] The battery pack structure according to claim 1, wherein the bottom plate of the second cavity (102) is a mounting plate (130), and wherein the BDU (30) and the BMS (20) are respectively arranged along the height direction of the housing (10) on two opposite sides of the mounting plate (130). [3] The battery pack structure according to claim 2, wherein the first direction is the longitudinal direction of the housing (10); and / or wherein the mounting plate (130) has a mounting hole to which the BMS (20) is fixedly connected by means of a fastening member. [4] The battery pack structure according to claim 2, wherein a reinforcing beam (70) is arranged on the upper surface of the mounting plate (130), on which the BDU (30) is arranged. [5] The battery pack structure according to claim 4, wherein the reinforcement beam (70) is welded to the mounting plate (130); and / or wherein the reinforcing beam (70) extends along a second direction perpendicular to the first direction; and / or wherein the reinforcing beams (70) are formed in a plurality, and the reinforcing beams (70) formed in a plurality are arranged at a distance along the first direction. [6] The battery pack structure according to claim 2, wherein a mounting channel (131) extending in a height direction of the housing (10) is arranged on the mounting plate (130), and wherein the battery pack structure further comprises: a connector (40) inserted into the interior of the mounting channel (131); and a wiring harness (80), wherein one end of the terminal (40) located outside the housing (10) is connected to the BMS (20) via the wiring harness (80), and another end of the terminal (40) located inside the housing (10) is arranged to be connected to the battery module. [7] The battery pack structure according to claim 6, wherein the battery pack structure further comprises a sealing member (90), at least a portion of the sealing member (90) being disposed between the mounting channel (131) and the terminal (40). [8] The battery pack structure according to claim 7, wherein the mounting plate (130) has a bending portion raised toward the inside of the second cavity (102), and wherein a mounting groove (103) with an opening orientation facing away from the BDU (30) is formed in the bending portion along the height direction of the housing (10), and wherein the BMS (20) and the wire harness (80) are arranged within the mounting groove (103). [9] The battery pack structure according to claim 8, wherein the battery pack structure further comprises: a protective plate (50), the protective plate (50) being detachably arranged outside the first cavity (101) and connected to the bottom surface of the housing (10); a maintenance plate (60), wherein the maintenance plate (60) is detachably connected to the mounting plate (130), wherein the maintenance plate (60) covers the opening of the mounting groove (103), and wherein the underside of the maintenance plate (60) is coplanar with the underside of the protective plate (50). [10] The battery pack structure according to claim 9, wherein the battery pack structure further comprises a sealing strip, wherein the sealing strip is arranged between the maintenance plate (60) and the mounting plate (130); and / or wherein the sealing strip is arranged between the protective plate (50) and the housing (10). [11] The battery pack structure according to any one of claims 1 to 10, wherein the housing (10) comprises: an outer frame (110); a back plate (150) and a mounting plate (130), wherein the back plate (150) and the mounting plate (130) are arranged at a lower opening of the outer frame (110), wherein the back plate (150) is arranged to support the battery module, and wherein the BMS (20) and the BDU (30) are arranged on the mounting plate (130); and a cover plate (120), wherein the cover plate (120) is arranged at the upper opening of the outer frame (110). [12] The battery pack structure according to claim 11, wherein the mounting plate (130) is fixed to the outer frame (110) by welding; and / or wherein the outer frame (110) has a wiring hole (104) arranged to open into the second cavity (102). [13] The battery pack structure according to claim 11, wherein the housing (10) further comprises a partition wall (140) connected to the outer frame (110), the partition wall (140) being arranged along the first direction between the mounting plate (130) and the back plate (150), the partition wall (140) extending toward the cover plate (120), and the partition wall (140) dividing the inner space of the housing (10) into the first cavity (101) and the second cavity (102) arranged along the first direction on both sides of the partition wall (140).

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