Battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery pack, which can obviously reduce the risk that the part of a flexible circuit board spanning a partition beam is in contact with a box cover, so that the flexible circuit board and the box cover are not easy to generate friction, and the problem that copper wires are exposed due to long-term friction between the flexible circuit board and the box cover is solved. Accuracy of battery pack signal acquisition is ensured, and reliability of battery pack monitoring by the flexible circuit board is ensured. The battery pack comprises a box body, a battery pack and a partition beam arranged in the box body, and the partition beam divides the interior of the box body into a battery bin and an electrical bin. The battery pack is arranged in the battery compartment. The flexible circuit board is electrically connected with the battery pack, the flexible circuit board spans the partition beam from the battery bin to extend towards the electrical bin, the part of the flexible circuit board in the battery bin is located on the upper surface of the battery pack, the upper surface of the battery pack is higher than the upper surface of the partition beam, and the part of the flexible circuit board spans the partition beam is provided with an inclined part extending towards the partition beam.

Description

battery pack Technical Field

[0001] This utility model relates to the field of new energy battery technology, specifically to a battery pack. Background Technology

[0002] In existing technology, the internal structure of a battery pack is divided into a battery compartment and an electrical compartment, with a partition beam between them. Multiple battery packs are housed within the battery compartment, and these battery packs are electrically connected to an FPC (Flexible Printed Circuit). The FPC is located on the upper surface of the battery pack and is electrically connected to a Battery Management System (BMS).

[0003] After battery assembly, because the FPC is made of soft material, it is easy for the FPC to arch upwards. During the use of the battery pack, the middle part of the cover is prone to vibration of varying amplitude. The arched FPC will rub against the cover. Over time, the arched FPC part may expose copper wires, affecting the accuracy of signal acquisition, affecting the monitoring and early warning of the battery pack, and may even cause short circuit risk, posing a safety hazard. Summary of the Invention

[0004] In view of this, the present invention provides a battery pack to solve the problem that the FPC arched part of the existing battery pack rubs against the box cover, affecting the accuracy of signal acquisition, affecting the monitoring and early warning of the battery pack, and also posing a safety hazard.

[0005] In a first aspect, this utility model provides a battery pack, comprising:

[0006] The housing has an internal partition beam that divides the interior of the housing into a battery compartment and an electrical compartment.

[0007] The battery pack is located within the battery compartment;

[0008] A flexible circuit board, electrically connected to the battery pack, extends from the battery compartment across the partition beam into the electrical compartment. The portion of the flexible circuit board located in the battery compartment is situated on the upper surface of the battery pack, which is higher than the upper surface of the partition beam. The portion of the flexible circuit board spanning the partition beam has an inclined portion extending toward the partition beam.

[0009] Beneficial Effects: In this utility model's battery pack, the flexible circuit board is located on the upper surface of the battery pack within the battery compartment, and the upper surface of the battery pack is higher than the upper surface of the partition beam. The portion of the flexible circuit board that crosses the partition beam has a downwardly extending inclined portion. By setting the portion of the flexible circuit board that crosses the partition beam as a downwardly extending inclined portion, it is possible to prevent the flexible circuit board from arching upwards and exceeding the highest point of the battery pack. Furthermore, the top of the battery pack housing is installed in conjunction with the housing cover. Above the partition beam, the extension direction of the flexible circuit board is downward, forming an inclined portion extending towards the partition beam. This keeps this portion of the flexible circuit board as far away from the housing cover as possible, reducing the risk of the flexible circuit board crossing the partition beam contacting the housing cover. This also reduces the likelihood of friction between the flexible circuit board and the housing cover, preventing copper wire exposure caused by long-term friction between the flexible circuit board and the housing cover. This ensures the accuracy of signal acquisition from the battery pack, thereby guaranteeing the reliability of the flexible circuit board's monitoring of the battery pack. Attached Figure Description

[0010] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 is a top view of the battery pack of this utility model;

[0012] Figure 2 is a three-dimensional schematic diagram of the battery pack of this utility model;

[0013] Figure 3 is an enlarged schematic diagram of part A in Figure 2;

[0014] Figure 4 is a two-dimensional schematic diagram of the battery pack of this utility model;

[0015] Figure 5 is an enlarged schematic diagram of part B in Figure 4;

[0016] Figure 6 is a schematic diagram showing the dimensions of the inclined region of the flexible circuit board of the battery pack of this utility model.

[0017] Figure 7 is a schematic diagram showing the dimensions of the inclined region of the flexible circuit board in another embodiment of the battery pack of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Housing; 101. Battery compartment; 102. Electrical compartment;

[0020] 2. Dividing beam;

[0021] 3. Battery pack;

[0022] 4. Flexible circuit board; 401. Inclined section;

[0023] 5. Spacer blocks;

[0024] 6. End plate; 601. Edge;

[0025] 7. Isolation mat;

[0026] 8. Battery Management System;

[0027] 9. Box lid. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In commercially available battery packs, after battery assembly, the FPC (Flexible Printed Circuit) is made of a soft material, making it prone to arching upwards, especially the part of the FPC that crosses the partition beam, which can protrude beyond the highest point of the battery pack. The top of the enclosure is fitted with the cover, and the cover is fixed to the enclosure frame. The cover is usually made of lightweight material, with a thinner central section. During battery pack use, the central section of the cover is not fixed and is prone to vibrations of varying amplitudes. The arched FPC will rub against the cover, and over time, the arched FPC may expose copper wires, affecting the accuracy of signal acquisition, impacting battery pack monitoring and early warning, and potentially even causing short circuits, posing a safety hazard.

[0030] Based on this, the present invention provides a battery pack in which the flexible circuit board and the cover are less prone to friction, thus ensuring the accuracy of signal acquisition from the battery pack.

[0031] The embodiments of the battery pack of this utility model are described below with reference to Figures 1 to 7.

[0032] According to an embodiment of the present invention, a battery pack is provided, comprising: a housing 1, a battery pack 3, and a flexible printed circuit (FPC) 4. The housing 1 has an internal partition beam 2 (or crossbeam) that divides the interior of the housing 1 into a battery compartment 101 and an electrical compartment 102. The battery pack 3 is disposed within the battery compartment 101. The flexible printed circuit 4 is electrically connected to the battery pack 3. The flexible printed circuit 4 extends from the battery compartment 101 across the partition beam 2 towards the electrical compartment 102. The portion of the flexible printed circuit 4 located in the battery compartment 101 is situated on the upper surface of the battery pack 3, and the upper surface of the battery pack 3 is higher than the upper surface of the partition beam 2. The portion of the flexible printed circuit 4 spanning the partition beam 2 has an inclined portion 401 extending towards the partition beam 2.

[0033] In this battery pack, by setting the portion of the flexible circuit board 4 that crosses the partition beam 2 as a downwardly extending inclined portion 401, it is possible to prevent the flexible circuit board 4 from arching upwards and exceeding the highest point of the battery pack 3. Moreover, the top of the battery pack housing 1 is installed in conjunction with the housing cover 9. Above the partition beam 2, the extension direction of the flexible circuit board 4 is downward, forming an inclined portion 401 extending towards the partition beam 2. This keeps this portion of the flexible circuit board 4 as far away from the housing cover 9 as possible, reducing the risk of the portion of the flexible circuit board 4 crossing the partition beam 2 contacting the housing cover 9. This makes it less likely for the flexible circuit board 4 to rub against the housing cover 9, preventing the copper wires from being exposed due to long-term friction between the flexible circuit board 4 and the housing cover 9. This ensures the accuracy of signal acquisition from the battery pack 3, thereby guaranteeing the reliability of the flexible circuit board 4 in monitoring the battery pack.

[0034] The battery pack includes a housing 1, which is a crucial structural component. It primarily houses and supports the battery pack 3 and electrical components within the pack. The structural strength of the housing 1 directly impacts the reliability and safety of the battery pack. As shown in Figures 1, 2, and 4, in this embodiment, the housing 1 has a near-rectangular shape, and its specific shape is adapted to the space requirements of its application scenario. The housing 1 includes a base plate and a frame. The frame surrounds the edge of the base plate, forming a receiving space where the battery pack 3 and electrical components are housed. The battery pack also includes a cover 9, which is fitted and sealed to the housing 1 to maintain a sealed interior and ensure the battery pack's safety. The top of the housing 1 has an opening, and the cover 9 is placed over this opening during assembly.

[0035] It should be noted that in this embodiment, the width direction of the box 1 refers to the x-direction, and the width of the box 1 refers to the dimension of the box 1 along the x-direction; the length direction of the box 1 refers to the y-direction, and the length of the box 1 refers to the dimension of the box 1 along the y-direction; the height direction of the box 1 refers to the z-direction, and the height of the box 1 refers to the dimension of the box 1 along the z-direction, as shown in Figures 1 and 2.

[0036] A partition beam 2 is provided inside the housing 1, dividing the interior of the housing 1 into a battery compartment 101 and an electrical compartment 102. In other words, the partition beam 2 divides the internal space of the housing 1 into the battery compartment 101 and the electrical compartment 102, making the battery compartment 101 and the electrical compartment 102 relatively independent. In this embodiment, the partition beam 2 is arranged along the width direction of the housing 1.

[0037] The battery pack 3 is disposed within the battery compartment 101. It should be noted that, in this embodiment, the battery pack 3 refers to a row of battery packs arranged along the length direction of the housing 1, and each row of battery pack 3 includes at least two batteries. In the width direction of the housing 1, the battery pack 3 is arranged in at least two rows, such as two, three, four, or five rows.

[0038] Electrical components such as a battery management system (BMS) are installed inside the electrical compartment 102.

[0039] The flexible circuit board 4 is electrically connected to the battery pack 3. The flexible circuit board 4 is used to collect information from the battery pack 3 and monitor the operation of the battery pack. The flexible circuit board 4 has at least two wires inside, and the wires are usually made of copper. For example, two, three, or six wires can be installed inside the flexible circuit board 4. The specific number of wires is selected according to the needs of line transmission.

[0040] As shown in Figure 1, the flexible circuit board 4 extends from the battery compartment 101 across the partition beam 2 to the electrical compartment 102, that is, the flexible circuit board 4 extends along the length of the housing 1 to achieve electrical connection. In other words, a portion of the flexible circuit board 4 is located inside the battery compartment 101, and a portion of the flexible circuit board 4 is located inside the electrical compartment 102. Inside the battery compartment 101, the flexible circuit board 4 is electrically connected to each battery pack 3, and the flexible circuit board 4 is located on the upper surface of the battery pack 3 (it should be noted that the upper surface of the battery pack 3 refers to the side of the battery pack 3 closest to the housing cover 9). Inside the electrical compartment 102, the flexible circuit board 4 is electrically connected to the battery management system 8. Due to the limited internal space of the electrical compartment 102, the flexible circuit board 4 can be bent within the electrical compartment 102 to adapt to the limited installation space without affecting the circuit connection.

[0041] In this embodiment, the upper surface of the battery pack 3 is higher than the upper surface of the partition beam 2, meaning the upper surface of the battery pack 3 is closer to the cover 9 than the upper surface of the partition beam 2, and the upper surface of the battery pack 3 protrudes from the upper surface of the partition beam 2. In the height direction of the housing 1, the horizontal position of the upper surface of the battery pack 3 is higher than the horizontal position of the upper surface of the partition beam 2, creating a height difference between the upper surface of the battery pack 3 and the upper surface of the partition beam 2, as shown in Figures 3 and 5. Therefore, the battery pack 3 and the partition beam 2 together form a stepped structure. When the flexible circuit board 4 extends from the upper surface of the battery pack 3 to the partition beam 2, the flexible circuit board 4 extends downwards at an angle, gradually approaching the upper surface of the partition beam 2, thereby forming an inclined portion 401. That is, the portion of the flexible circuit board 4 that crosses the partition beam 2 has an inclined portion 401 extending towards the partition beam 2.

[0042] By setting the inclined part 401, the part of the flexible circuit board 4 that crosses the partition beam 2 is less likely to arch upwards. And since the inclined part 401 is far away from the upper surface of the battery pack 3 in the height direction, even if the inclined part 401 arches slightly, it will not exceed the highest point of the battery pack 3, thereby effectively avoiding the friction problem between the flexible circuit board 4 and the box cover 9 and improving the service life of the flexible circuit board 4.

[0043] Furthermore, during battery pack operation, the charging and discharging process of battery pack 3 causes expansion and deformation of battery pack 3 along the length of the casing 1, meaning that the thickness of battery pack 3 along the length of the casing 1 increases. Therefore, to accommodate the expansion process of battery pack 3, the flexible circuit board 4 reserves expansion allowance at the inclined portion 401; that is, the inclined portion 401 is not taut but rather in a relaxed state. Moreover, the expansion allowance reserved at the inclined portion 401 cannot be too large or too small. Before setting the inclined portion 401, it is necessary to simulate the expansion and deformation process of battery pack 3 and calculate the simulated deformation amount. The expansion allowance at the inclined portion 401 is set based on this simulated deformation amount.

[0044] Furthermore, the angle between the inclined portion 401 near the partition beam 2 and the upper surface of the partition beam 2 is α, and the range of the angle α is 20°-60°.

[0045] The flexible circuit board 4 has a flexible structure, and the inclined part 401 has an expansion margin. However, the part of the inclined part 401 near the partition beam 2 is close to a straight structure. The angle formed between this part and the upper surface of the partition beam 2 is α, as shown in Figure 6. The angle α is an acute angle, and the range of the angle α is 20°-60°.

[0046] If the included angle α is too large, the tilt angle of the inclined part 401 of the flexible circuit board 4 will be too large and the slope will be too steep, which will result in excessive support requirements for the inclined part 401 and make it inconvenient to arrange the flexible circuit board 4. If the included angle α is too small, it will not be able to effectively reduce the distance between the inclined part 401 and the box cover 9, and there is still a risk that the flexible circuit board 4 will arch up and come into contact with the box cover 9.

[0047] The angle α between the portion of the inclined part 401 near the partition beam 2 and the upper surface of the partition beam 2 is neither too large nor too small within the above range. The support requirements of the inclined part 401 are appropriate, which is conducive to the arrangement of the inclined part 401. At the same time, it can effectively reduce the risk of contact friction between the flexible circuit board 4 and the box cover 9, and ensure the service life and operational reliability of the flexible circuit board 4.

[0048] For example, the angle α between the inclined portion 401 near the partition beam 2 and the upper surface of the partition beam 2 can be 20°, 30°, 45°, 52°, 60°, etc.

[0049] Furthermore, a pad 5 is provided between the upper surface of the battery pack 3 and the flexible circuit board 4.

[0050] As shown in Figures 5 and 6, a pad 5 is provided between the upper surface of the battery pack 3 and the flexible circuit board 4. The pad 5 is located on the upper surface of the battery pack 3 and supports the flexible circuit board 4, thereby raising the horizontal position of the flexible circuit board 4 on the upper surface of the battery pack 3. This is because the battery pack 3 also has a busbar inside the battery compartment 101, which needs to be electrically connected to the flexible circuit board 4 (for example, the flexible circuit board 4 has a metal sheet, and the flexible circuit board 4 and the busbar are electrically connected through this metal sheet). The busbar is located on the upper surface of the battery pack 3 and is higher than the upper surface of the battery pack 3. In order to facilitate the electrical connection between the busbar and the flexible circuit board 4, the busbar and the flexible circuit board 4 should be located on the same horizontal plane as much as possible. By providing the pad 5, the busbar and the flexible circuit board 4 can be located on the same horizontal plane, which facilitates the electrical connection between the busbar and the flexible circuit board 4. Therefore, the height of the pad 5 depends on the height difference between the upper surface of the battery pack 3 and the busbar.

[0051] Furthermore, the length and width of the pad 5 should match the dimensions of the flexible circuit board 4 on the upper surface of the battery pack 3 to smoothly raise the horizontal position of the flexible circuit board 4. The pad 5 can be made of flexible material, such as foam, to prevent damage to the flexible circuit board 4 caused by prolonged contact and friction between the lower surface of the flexible circuit board 4 and the pad 5, thus protecting the flexible circuit board 4.

[0052] Furthermore, along the z-direction, the height of the upper surface of the battery pack 3 above the upper surface of the separator beam 2 is a; along the x-direction, the width of the upper surface of the separator beam 2 is b; along the z-direction, the height of the pad 5 is c; and the length of the inclined portion 401 is L, satisfying the following:

[0053] As shown in Figure 6, the starting point of the inclined section 401 is the intersection point m between the flexible circuit board 4 and the edge of the pad block 5, and the ending point of the inclined section 401 is the intersection point n between the flexible circuit board 4 and the edge of the partition beam 2. Between intersection point m and intersection point n, due to the expansion allowance reserved in the inclined section 401, the shape and structure of the inclined section 401 is an arc with a certain downward curvature, and the length of the inclined section 401 from intersection point m to intersection point n is the length L of the inclined section 401.

[0054] The length L of the inclined portion 401 should not be too short; otherwise, the inclined portion 401 will be in a taut or nearly taut state. When the battery pack 3 is subjected to impact and expansion deformation, the flexible circuit board 4 will not have enough room for expansion and will be easily pulled apart. On the other hand, the length L of the inclined portion 401 should not be too long either; otherwise, the flexible circuit board 4 will easily arch too high and come into contact with the cover 9.

[0055] Along the z-direction, the height *a* of the upper surface of battery pack 3 above the upper surface of separator beam 2 is 12mm-45mm, for example, height *a* can be 12mm, 18mm, 22mm, 30mm, 45mm, etc. Along the x-direction, the width of the upper surface of separator beam 2 is *b*, also ranging from 12mm to 40mm, for example, width *b* can be 12mm, 25mm, 36mm, 40mm, etc. Along the z-direction, the height *c* of pad 5 is 2mm-8mm, for example, height *c* can be 2mm, 4mm, 5mm, 8mm, etc. The height *a* of the upper surface of battery pack 3 above the upper surface of separator beam 2 and the height *c* of pad 5 form one leg of a right triangle, while the width *b* of the upper surface of separator beam 2 forms the other leg of the right triangle. Let be the length of the hypotenuse of the right triangle.

[0056] Because the inclined portion 401 has a downward-curving arc shape, its length L is greater than the length of the hypotenuse of the right triangle, that is... However, the length L of the inclined part 401 should not be too long, otherwise the flexible circuit board 4 may arch too high and then come into contact with the cover 9.

[0057] In this embodiment, the length L of the inclined portion 401 ranges from 22mm to 60mm. For example, the length L can be 22mm, 35mm, 42mm, 55mm, 60mm, etc., and satisfies... Because a pad 5 is provided on the upper surface of the battery pack 3, the flexible circuit board 4 is closer to the cover 9. Therefore, the expansion allowance at the inclined portion 401 should be smaller. The upper limit value is reduced to further prevent the inclined part 401 from arching. Within the above range, the inclined part 401 will not be too long or too short, so as to leave room for the expansion deformation of the battery pack 3, and to avoid the inclined part 401 arching too high, causing the flexible circuit board 4 to come into contact with the cover 9 and cause friction.

[0058] For example, The values ​​can be 0.5mm, 1.2mm, 2.8mm, 3.5mm, 4.9mm, 5.5mm, 6.3mm, 7.2mm, etc.

[0059] Furthermore, the distance between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the partition beam 2 is h1, and the range of distance h1 is 20mm-42mm.

[0060] The battery pack in this embodiment also includes a cover 9. The top of the housing 1 is connected to the cover 9, and the cover 9 is fixed to the frame of the housing 1 to encapsulate the housing 1. After the cover 9 is installed in conjunction with the top of the housing 1, there is a certain distance, h1, between the top surface of the cover 9 facing the inside of the housing 1 and the upper surface of the partition beam 2, and the range of the distance h1 is 20mm-42mm, as shown in Figure 6.

[0061] The distance between the top surface of the cover 9 facing the interior of the housing 1 and the upper surface of the partition beam 2 should not be too small. Otherwise, the flexible circuit board 4 will be too close to the cover 9, and the flexible circuit board 4 will easily come into contact and rub against the cover 9 after arching, causing the copper wires of the flexible circuit board 4 to be exposed, affecting the acquisition of signals from the battery pack 3. On the other hand, the distance between the top surface of the cover 9 facing the interior of the housing 1 and the upper surface of the partition beam 2 should not be too large, as this will increase the height of the housing 1, making the housing 1 too large, resulting in poor space utilization inside the housing 1, affecting the energy density of the battery pack, and also affecting the setting of the inclined part 401, making the inclined part 401 too steep, requiring too much support for the inclined part 401, and making it inconvenient to arrange the flexible circuit board 4.

[0062] In this embodiment, the distance h1 ranges from 20mm to 42mm. Within this range, the distance between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the partition beam 2 will not be too small or too large. The flexible circuit board 4 will not be too close to the cover 9, thus avoiding contact and friction between the flexible circuit board 4 and the cover 9 after the flexible circuit board 4 arches up. This effectively protects the flexible circuit board 4 without increasing the volume of the box body 1, optimizing the space utilization of the box body 1, improving the energy density of the battery pack, and also facilitating the arrangement of the inclined part 401.

[0063] For example, the distance h1 between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the partition beam 2 can be 20mm, 26mm, 30mm, 40mm, 42mm, etc.

[0064] Furthermore, the distance between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the battery pack 3 is h2, and the range of the distance h2 is 5mm-18mm.

[0065] After the cover 9 is installed in conjunction with the top of the box body 1, the top surface of the cover 9 facing the inside of the box body 1 is a certain distance from the upper surface of the battery pack 3. This distance is h2, and the range of this distance h2 is 5mm-18mm, as shown in Figure 6.

[0066] The distance between the top surface of the cover 9 facing the inside of the housing 1 and the upper surface of the battery pack 3 should not be too small. Otherwise, the flexible circuit board 4 will be too close to the cover 9, and the flexible circuit board 4 will arch up and easily come into contact and rub against the cover 9, causing the copper wires of the flexible circuit board 4 to be exposed, affecting the acquisition of signals from the battery pack 3. On the other hand, the distance between the top surface of the cover 9 facing the inside of the housing 1 and the upper surface of the battery pack 3 should not be too large, as this will increase the height of the housing 1, making the housing 1 too large, resulting in poor space utilization inside the housing 1 and affecting the energy density of the battery pack.

[0067] In this embodiment, the distance h2 is in the range of 5mm-18mm. Within this range, the distance between the top surface of the cover 9 facing the inside of the box 1 and the upper surface of the battery pack 3 will not be too small or too large. The flexible circuit board 4 will not be too close to the cover 9, thus avoiding contact and friction between the flexible circuit board 4 and the cover 9 after the flexible circuit board 4 arches up. This effectively protects the flexible circuit board 4 without increasing the volume of the box 1, optimizing the space utilization of the box 1, improving the energy density of the battery pack, and also facilitating the arrangement of the inclined part 401.

[0068] For example, the distance h2 between the top surface of the cover 9 facing the inside of the box 1 and the upper surface of the battery pack 3 can be 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, etc.

[0069] Furthermore, an end plate 6 is provided between the battery pack 3 and the partition beam 2, and an isolation pad 7 is provided on the inclined portion 401 at least in the portion facing the end plate 6.

[0070] In this embodiment, an end plate 6 is provided between the battery pack 3 and the partition beam 2. The end plate 6 is mainly used for auxiliary positioning of the battery pack 3 to facilitate its installation. As shown in Figure 6, specifically, the height of the end plate 6 is lower than the height of the upper surface of the battery pack 3, and the end plate 6 is a rectangular plate structure. The edge 601 of the end plate 6 facing the flexible circuit board 4 is usually an acute edge. Since the inclined portion 401 of the flexible circuit board 4 is in a relaxed state, during the use of the battery pack, under the action of external force vibration, the inclined portion 401 is prone to contact with the edge 601. Over time, the side of the inclined portion 401 facing the edge 601 is prone to wear and exposure of the internal copper wires, which may affect signal acquisition. Therefore, an isolation pad 7 is provided at least on the part of the inclined portion 401 facing the end plate 6. The isolation pad 7 is provided on the back side of the inclined portion 401 to protect the inclined portion 401 and prevent the edge 601 from contacting the inclined portion 401. In this embodiment, the width of the end plate 6 (the dimension of the end plate 6 in the y direction) is in the range of 0.5mm-4mm. For example, the width of the end plate 6 can be 0.5mm, 1mm, 2.5mm, 3mm, 4mm, etc.

[0071] Optionally, the area covered by the isolation pad 7 on the back side of the inclined portion 401 can be slightly larger to improve the reliability of the structure. Furthermore, the isolation pad 7 can also be installed at the corner where the horizontal portion of the flexible circuit board 4 turns towards the inclined portion 401 to further enhance the protection of the flexible circuit board 4.

[0072] In addition, since a pad 5 is provided between the upper surface of the battery pack 3 and the flexible circuit board 4, the pad 5 will raise the flexible circuit board 4, so that the horizontal part of the flexible circuit board 4 is suspended below the corner position of the inclined part 401, and the back side of the inclined part 401 is as far away from the edge 601 of the end plate 6 as possible, thus strengthening the protection of the flexible circuit board 4.

[0073] Furthermore, the distance between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the end plate 6 is h3, and the range of the distance h3 is 5mm-18mm.

[0074] After the cover 9 is installed in conjunction with the top of the box body 1, there is a certain distance between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the end plate 6. This distance is h3, and the range of this distance h3 is 5mm-18mm, as shown in Figure 6.

[0075] The distance between the top surface of the cover 9 facing the interior of the housing 1 and the upper surface of the end plate 6 should not be too small. Otherwise, the flexible circuit board 4 will be too close to the cover 9, and the flexible circuit board 4 will arch up and easily come into contact and rub against the cover 9, causing the copper wires of the flexible circuit board 4 to be exposed, affecting the acquisition of signals from the battery pack 3. On the other hand, the distance between the top surface of the cover 9 facing the interior of the housing 1 and the upper surface of the battery pack 3 should not be too large, as this will increase the height of the housing 1, making the housing 1 too large, resulting in poor space utilization inside the housing 1 and affecting the energy density of the battery pack.

[0076] In this embodiment, the distance h3 is in the range of 5mm-18mm. Within this range, the distance between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the end plate 6 will be neither too small nor too large. The flexible circuit board 4 will not be too close to the cover 9, thus avoiding contact and friction between the flexible circuit board 4 and the cover 9 after the flexible circuit board 4 arches up. This effectively protects the flexible circuit board 4 without increasing the volume of the box body 1, optimizing the space utilization of the box body 1, improving the energy density of the battery pack, and also facilitating the arrangement of the inclined part 401.

[0077] For example, the distance h3 between the top surface of the cover 9 facing the inside of the box body 1 and the upper surface of the end plate 6 can be 5mm, 7mm, 9mm, 11mm, 15mm, 18mm, etc.

[0078] Furthermore, the portion of the flexible circuit board 4 placed in the electrical compartment 102 is directly connected to the battery management system 8.

[0079] The flexible circuit board 4 crosses the partition beam 2 from the battery compartment 101 and enters the electrical compartment 102. The electrical compartment 102 is equipped with key components such as the battery management system 8 and high-voltage interface, which realizes the reliable connection between the battery pack and the external system, and supports real-time monitoring of voltage, current and temperature.

[0080] After the flexible circuit board 4 extends across the partition beam 2 to the electrical compartment 102, the portion of the flexible circuit board 4 placed in the electrical compartment 102 is directly plugged into the battery management system 8. That is, the flexible circuit board 4 does not need to be electrically connected to the battery management system 8 through other adapter structures (such as wire harness adapter structures), which simplifies the circuit structure and facilitates layout.

[0081] As shown in Figure 5, after the flexible circuit board 4 leaves the partition beam 2 and enters the electrical compartment 102, the flexible circuit board 4 is bent to directly connect with the battery management system 8. The bending process of the flexible circuit board 4 is set according to the setting space and the setting position of the battery management system 8.

[0082] Furthermore, in order to facilitate direct connection between the flexible circuit board 4 and the battery management system 8, after the flexible circuit board 4 crosses the partition beam 2, the flexible circuit board 4 can be attached to the side of the partition beam 2 facing the electrical compartment 102. For example, foam can be used to fix the flexible circuit board 4 to the side of the partition beam 2 facing the electrical compartment 102 to fix the shape of the flexible circuit board 4 and facilitate the electrical connection between the flexible circuit board 4 and the battery management system 8.

[0083] As shown in Figure 7, in another embodiment of this utility model, the flexible circuit board 4 is directly disposed on the upper surface of the battery pack 3 inside the battery compartment 101, and the busbar is disposed almost flush with the upper surface of the battery pack 3. Therefore, it is not necessary to provide a pad 5 between the upper surface of the battery pack 3 and the flexible circuit board 4.

[0084] At this point, along the z-direction, the height of the upper surface of battery pack 3 above the upper surface of separator beam 2 is a, along the x-direction, the width of the upper surface of separator beam 2 is b, and the length of the inclined portion 401 is L, satisfying the following:

[0085]

[0086] As shown in Figure 7, the starting point of the inclined section 401 is the intersection point m' of the flexible circuit board 4 and the edge of the battery pack 3, and the ending point of the inclined section 401 is the intersection point n' of the flexible circuit board 4 and the edge of the partition beam 2. Between the intersection points m' and n', due to the expansion allowance reserved in the inclined section 401, the shape and structure of the inclined section 401 is an arc with a certain downward curvature, and the length of the inclined section 401 from the intersection point m' to the intersection point n' is the length L of the inclined section 401.

[0087] The length L of the inclined portion 401 should not be too short; otherwise, the inclined portion 401 will be in a taut or nearly taut state. When the battery pack 3 is subjected to impact and expansion deformation, the flexible circuit board 4 will not have enough room for expansion and will be easily pulled apart. On the other hand, the length L of the inclined portion 401 should not be too long either; otherwise, the flexible circuit board 4 will easily arch too high and come into contact with the cover 9.

[0088] Along the z-direction, the height 'a' of the upper surface of battery pack 3 above the upper surface of separator beam 2 is 12mm-45mm, for example, 12mm, 15mm, 23mm, 36mm, 45mm, etc. Along the x-direction, the width 'b' of the upper surface of separator beam 2 is 12mm-40mm, for example, 12mm, 26mm, 33mm, 40mm, etc. The height 'a' of the upper surface of battery pack 3 above the upper surface of separator beam 2 forms one leg of a right triangle, while the width 'b' of the upper surface of separator beam 2 forms the other leg of the right triangle. Let be the length of the hypotenuse of the right triangle.

[0089] Because the inclined portion 401 has a downward-curving arc shape, its length L is greater than the length of the hypotenuse of the right triangle, that is... However, the length L of the inclined part 401 should not be too long, otherwise the flexible circuit board 4 may arch too high and then come into contact with the cover 9.

[0090] In this embodiment, the length L of the inclined portion 401 ranges from 20mm to 56mm. For example, the length L can be 20mm, 32mm, 41mm, 50mm, 56mm, etc., and satisfies... Within the aforementioned range, the inclined portion 401 is neither too long nor too short, which allows for expansion margins to accommodate the expansion and deformation of the battery pack 3, while also preventing the inclined portion 401 from arching too high and causing contact friction between the flexible circuit board 4 and the cover 9.

[0091] For example, The values ​​can be 0.5mm, 1.0mm, 2.5mm, 3.6mm, 4.6mm, 5mm, 6.8mm, 7mm, 8mm, etc.

[0092] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: A housing (1) is provided inside, with a partition beam (2) dividing the interior of the housing (1) into a battery compartment (101) and an electrical compartment (102); a battery pack (3) is disposed in the battery compartment (101); a flexible circuit board (4) is electrically connected to the battery pack (3), the flexible circuit board (4) extends from the battery compartment (101) across the partition beam (2) to the electrical compartment (102), the portion of the flexible circuit board (4) placed in the battery compartment (101) is located on the upper surface of the battery pack (3), the upper surface of the battery pack (3) is higher than the upper surface of the partition beam (2), and the portion of the flexible circuit board (4) that crosses the partition beam (2) has an inclined portion (401) extending toward the partition beam (2).

2. The battery pack according to claim 1, characterized in that, The angle between the inclined portion (401) near the partition beam (2) and the upper surface of the partition beam (2) is α, and the angle α ranges from 20° to 60°.

3. The battery pack according to claim 1, characterized in that, Along the z-direction, the height of the upper surface of the battery pack (3) above the upper surface of the separator beam (2) is a, and along the x-direction, the width of the upper surface of the separator beam (2) is b, and the length of the inclined portion (401) is L, satisfying:

4. The battery pack according to claim 1, characterized in that, A pad (5) is provided between the upper surface of the battery pack (3) and the flexible circuit board (4).

5. The battery pack according to claim 4, characterized in that, Along the z-direction, the height of the upper surface of the battery pack (3) above the upper surface of the separator beam (2) is a; along the x-direction, the width of the upper surface of the separator beam (2) is b; along the z-direction, the height of the pad (5) is c; and the length of the inclined part (401) is L, satisfying:

6. The battery pack according to claim 1, characterized in that, It also includes a box cover (9), which is connected to the box body (1). The distance between the top surface of the box cover (9) facing the inside of the box body (1) and the upper surface of the partition beam (2) is h1, and the range of the distance h1 is 20mm-42mm.

7. The battery pack according to claim 6, characterized in that, The distance between the top surface of the cover (9) facing the inside of the box body (1) and the upper surface of the battery pack (3) is h2, and the range of the distance h2 is 5mm-18mm.

8. The battery pack according to claim 6, characterized in that, An end plate (6) is provided between the battery pack (3) and the partition beam (2), and an isolation pad (7) is provided on the inclined portion (401) at least in the portion facing the end plate (6).

9. The battery pack according to claim 8, characterized in that, The distance between the top surface of the cover (9) facing the inside of the box body (1) and the upper surface of the end plate (6) is h3, and the range of the distance h3 is 5mm-18mm.

10. The battery pack according to any one of claims 1-9, characterized in that, The portion of the flexible circuit board (4) placed in the electrical compartment (102) is directly plugged into the battery management system (8).

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