Battery pack

Abstract

The present application relates to the technical field of batteries, and particularly to a battery pack, comprising a battery module and a case, wherein the battery module is arranged in the case; the battery module comprises battery cells; each battery cell is provided with poles, and the poles are arranged on a large surface of the battery cell and close to the end portions of the battery cell in the length direction. The battery pack further comprises a potting adhesive; the potting adhesive is at least partially connected between the end portion of the battery module in the length direction and an end beam of the case; the bonding area of the potting adhesive and a metal region of the battery module is S1, the bonding area of the potting adhesive and the case is S2, and the value range of S1 / S2 is 1 / 5-1 / 2. In the present application, the potting adhesive simultaneously has the functions of insulation, fixing and sealing, improves the installation stability of the battery module, increases the energy density of the battery pack, and ensures the insulation and sealing performances of the battery module.

Description

Battery pack

[0001] The present application claims priority to the Chinese patent application No. 202411548866.6, filed on November 01, 2024, and entitled "Battery pack", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0003] In the battery pack structure of the related art, a pressing plate is arranged above the battery pack in the box body to limit the position of the battery pack, so as to avoid dislocation of each battery cell when the battery pack vibrates in the height direction. However, the pressing plate needs to occupy the height space inside the box body, thereby reducing the energy density of the battery pack. In addition, in the battery pack structure of the related art, the box body is usually sealed as a whole to prevent foreign matters or water vapor from entering the inside of the box body. However, foreign matters or water vapor in the inside of the box body may still invade into the inside of the battery pack, thereby causing short circuit and other problems. SUMMARY

[0004] The purpose of the present application is to provide a battery pack, improve the installation stability of the battery pack, improve the energy density of the battery pack, and ensure the insulation and sealing performance of the battery pack.

[0005] To solve the above technical problems, the present application provides a battery pack, comprising a battery pack and a box body, the battery pack is arranged in the inside of the box body, the battery pack comprises battery cells, the battery cells have pole columns, the pole columns are arranged on the large faces of the battery cells and close to the end portions of the battery cells in the length direction,

[0006] The battery pack further comprises a pouring sealant, the pouring sealant is at least partially connected between the end portion of the battery pack in the length direction and the end beam of the box body, the bonding area between the pouring sealant and the metal area of the battery pack is S1, the bonding area between the pouring sealant and the box body is S2, and the value range of S1 / S2 is 1 / 5-1 / 2.

[0007] Optionally, the battery cell is provided with an explosion-proof valve, and the explosion-proof valve is exposed to the pouring sealant.

[0008] Optionally, the end portion of the battery cell in the length direction is provided with a recessed portion, the recessed portion penetrates one of the large faces of the battery cell, and part of the pouring sealant is located in the inside of the recessed portion and connected with at least part of the wall portion surrounding the recessed portion.

[0009] Optionally, the height difference between the upper end profile of the pole column and the upper end profile of the pouring sealant is in the range of -15mm-30mm.

[0010] Optionally, the battery pack further includes a conductive busbar connecting the terminals of two adjacent battery cells. The conductive busbar has an insulating film attached to at least the wall facing away from the battery cell, and a portion of the lower end of the insulating film is located within the height range of the potting compound.

[0011] Optionally, the battery pack further includes a conductive busbar that connects the terminals of two adjacent battery cells. Within the height range of the potting compound, the conductive busbar and the end beam of the housing are insulated from each other by the potting compound.

[0012] Optionally, the ratio of the height of the potting compound to the height of the end beam of the housing is in the range of 1 / 5 to 2 / 3.

[0013] Optionally, the battery pack further includes an insulating bracket, which is installed at the end of the battery cell along its length and covers a portion of the metal area at the end of the battery cell along its length. The potting compound is partially connected between the insulating bracket and the end beam of the housing.

[0014] Alternatively, within the height range of the potting compound, the metal region at the end of the battery cell along its length is directly connected to the potting compound.

[0015] Optionally, there are multiple battery cells arranged in a direction perpendicular to the large surface, and the potting compound extends along the arrangement direction of the battery cells. The two ends of the extension direction of the potting compound are connected to the corresponding crossbeams of the housing.

[0016] Optionally, the battery pack further includes two parallel end insulating plates, with the battery pack located between the two end insulating plates. An overflow groove is formed between the end insulating plates and the housing, and the potting compound partially fills the overflow groove and connects the end insulating plates and the housing.

[0017] The technical advantages of the battery pack in this application are as follows:

[0018] In this embodiment of the battery pack, the terminals are located on the large surface of the individual battery cells, near the end of the cell along its length. These terminals need to be connected to the busbars. This unique terminal arrangement makes it impossible to insulate the end of the individual battery cells along its length using traditional insulating films. Therefore, in this embodiment, potting compound is applied at least between the end of the battery pack along its length and the end beam of the housing. The potting compound adheres directly to the metal area of ​​the battery pack, providing insulation and sealing to prevent foreign objects or moisture from entering the battery pack from the end along its length. Furthermore, this potting method ensures a tighter bond between the potting compound and the end of the battery pack along its length, resulting in better insulation and sealing.

[0019] Furthermore, in this embodiment, the battery cell is a long strip structure. If the two ends of the battery cell are not fixed along its length, the battery cell is prone to deformation. However, in this embodiment, the battery pack and the housing are connected as a whole by potting compound, which makes the battery pack more stable when installed inside the housing. This prevents the battery cells from misaligning when the battery pack vibrates along the height direction, avoids deformation of the battery cells, improves the overall structural strength of the battery pack, improves the modal performance of the battery pack, eliminates the need for pressure plates in related battery packs, saves internal space in the housing, increases the energy density of the battery pack, eliminates the need for separate fixing steps for the battery pack in related battery packs, simplifies the battery pack assembly process, and improves assembly efficiency.

[0020] In short, in this embodiment of the battery pack, the potting compound can simultaneously serve the functions of insulation, fixation, and sealing, thereby improving the installation stability of the battery pack, increasing the energy density of the battery pack, and ensuring the insulation and sealing performance of the battery pack.

[0021] Furthermore, to ensure uniform adhesion between the potting compound and the end beams of the battery pack and the casing, preventing adhesion failure, the ratio of S1 to S2 needs to be controlled. If the ratio of S1 to S2 is too large, it indicates that the adhesion strength between the potting compound and the battery pack is much greater than that between the potting compound and the end beams of the casing. During the use of the battery pack, the cured colloid, under prolonged vibration conditions, is prone to fatigue aging and cracking, leading to a loss of adhesion between the potting compound and the end beams of the casing, thus negating the effect of improving the modal performance of the battery pack. Conversely, if the ratio of S1 to S2 is too small, it indicates insufficient adhesion between the potting compound and the battery pack, with the adhesion strength being much lower than that between the potting compound and the end beams of the casing. During the use of the battery pack, the cured colloid, under prolonged vibration conditions, is prone to fatigue aging and cracking, leading to a loss of adhesion between the potting compound and the battery pack, thus negating the effect of improving the modal performance of the battery pack. Therefore, in this embodiment, the ratio of S1 to S2 is within the range of the above values ​​to ensure uniform bonding strength between the potting compound and the battery pack, and between the potting compound and the end beam of the housing, thus preventing bonding failure and other problems during the use of the battery pack. Attached Figure Description

[0022] Figure 1 is a partial cross-sectional view of a first specific embodiment of the battery pack provided in this application;

[0023] Figure 2 is a schematic diagram of the structure of a single battery cell in the battery pack in Figure 1;

[0024] Figure 3 is a schematic diagram of the second angle of the battery cell in Figure 2;

[0025] Figure 4 is a schematic diagram of the structure of the battery pack in Figure 1 when the insulating film is hidden.

[0026] Figure 5 is a partial cross-sectional view of the battery pack in Figure 1 at the second angle;

[0027] The reference numerals in Figures 1-5 are as follows: 1-Battery pack; 11-Battery cell; 111-Terminal post; 11A-Large surface; 11a-Recessed part; 12-Conducting busbar; 13-Insulating film; 2-Box; 21-End beam; 3-Potting compound; 4-Insulating bracket; 5-End insulating plate. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Please refer to Figures 1-4. Figure 1 is a partial cross-sectional view of the first specific embodiment of the battery pack provided in this application; Figure 2 is a structural schematic diagram of the battery cell in the battery pack of Figure 1; Figure 3 is a structural schematic diagram of the battery cell of Figure 2 at a second angle; and Figure 4 is a structural schematic diagram of the battery pack of Figure 1 when the insulating film is hidden.

[0030] This embodiment provides a battery pack, including a battery assembly 1 and a housing 2. The battery assembly 1 is disposed inside the housing 2. The battery assembly 1 includes a battery cell 11, and the battery cell 11 has a terminal post 111. The terminal post 111 is disposed on the large surface 11A of the battery cell 11 and near the end of the battery cell 11 along its length.

[0031] The battery pack also includes potting compound 3, which is at least partially connected between the end of the battery pack 1 along its length and the end beam 21 of the housing 2. The bonding area between the potting compound 3 and the metal area of ​​the battery pack 1 is S1, and the bonding area between the potting compound 3 and the housing 2 is S2. The value range of S1 / S2 is 1 / 5 to 1 / 2.

[0032] The bonding area between the potting compound 3 and the metal area of ​​the battery pack 1 is S1, which is the area of ​​the exposed metal casing at the middle end of the row of batteries opposite the end beam 21 in the battery pack 1. When the battery pack 1 is equipped with an insulating support 4, the area at the middle end of the row of batteries opposite the end beam 21 that is not covered by the insulating support 4 is S1, including the surface where the battery and the end beam 21 are parallel or at a certain angle. The bonding area between the potting compound 3 and the housing 2 is S2, which is the area at the surface where the end beam 21 of the housing 2 and the battery pack 1 are opposite.

[0033] In this embodiment of the battery pack, the terminal post 111 is disposed on the large surface 11A of the battery cell 11 and close to the end of the battery cell 11 along its length. The terminal post 111 needs to be connected to the conductive busbar. This special arrangement of the terminal post 111 makes it impossible to insulate the end of the battery cell 11 along its length using a traditional insulating film. Based on this, in this embodiment, potting compound 3 is disposed at least between the end of the battery pack 1 along its length and the end beam 21 of the housing 2. The potting compound 3 is directly bonded to the metal area of ​​the battery pack 1, providing insulation and protection for the battery pack 1 and sealing it to prevent foreign objects or moisture from entering the battery pack 1 from the end of the battery pack 1 along its length. Furthermore, this potting method makes the bond between the potting compound 3 and the end of the battery pack 1 along its length more compact, resulting in better insulation and sealing effects.

[0034] Furthermore, in this embodiment, the battery cell 11 is a long strip structure. If the two ends of the battery cell 11 are not fixed along its length, the battery cell 11 is prone to deformation. In this embodiment, the battery pack 1 and the housing 2 are connected as a whole by the potting compound 3, which makes the battery pack 1 more stable when installed inside the housing 2. This avoids misalignment of the battery cells 11 when the battery pack 1 vibrates along the height direction, prevents deformation of the battery cells 11, improves the overall structural strength of the battery pack, improves the modal performance of the battery pack, eliminates the pressure plate in the battery pack of related technologies, saves internal space of the housing 2, increases the energy density of the battery pack, eliminates the separate fixing step of the battery pack in the battery pack of related technologies, simplifies the assembly process of the battery pack, and improves assembly efficiency.

[0035] In short, in this embodiment of the battery pack, the potting compound 3 can simultaneously serve the functions of insulation, fixation, and sealing, thereby improving the installation stability of the battery pack 1, increasing the energy density of the battery pack, and improving the insulation and sealing performance of the battery pack 1.

[0036] Furthermore, to ensure uniform adhesion between the potting compound 3 and the end beam 21 of the battery pack 1 and the housing 2, and to prevent adhesion failure in practical applications, the ratio of S1 to S2 needs to be controlled. If the ratio of S1 to S2 is too large, it indicates that the adhesion strength between the potting compound 3 and the battery pack 1 is much greater than the adhesion strength between the potting compound 3 and the end beam 21 of the housing 2. During the use of the battery pack, the cured adhesive is prone to fatigue aging under long-term vibration conditions, which can easily lead to adhesive layer breakage, resulting in adhesion failure between the potting compound 3 and the end beam 21 of the housing 2. If the ratio of S1 to S2 is too small, it indicates insufficient adhesion between the potting compound 3 and the battery pack 1. The bond strength between the potting compound 3 and the battery pack 1 is much weaker than the bond strength between the potting compound 3 and the end beam 21 of the housing 2. During the use of the battery pack, the cured colloid is prone to fatigue aging under long-term vibration conditions, which can easily lead to colloid layer breakage. This results in the potting compound 3 and the battery pack 1 easily losing their bond, thus losing the effect of improving the modal performance of the battery pack. Based on this, in this embodiment, the ratio of S1 to S2 is within the above range to ensure uniform bond strength between the potting compound 3 and the battery pack 1, and between the potting compound 3 and the end beam 21 of the housing 2, preventing problems such as bonding failure during the use of the battery pack.

[0037] Furthermore, in this embodiment, the battery cell 11 is provided with an explosion-proof valve, which is exposed outside the potting compound 3.

[0038] This avoids the problem of the explosion-proof valve failing to open due to the blockage of the potting compound 3, and ensures that the explosion-proof valve automatically opens to release pressure when the internal pressure of the battery cell 11 is too high, thereby improving the safety performance of the battery pack.

[0039] Further, please continue to refer to Figures 2 and 4. In this embodiment, a recess 11a is provided at the end of the battery cell 11 along its length. The recess 11a penetrates one of the large surfaces 11A of the battery cell 11. Part of the potting compound 3 is located inside the recess 11a and is connected to at least part of the wall surrounding the recess 11a.

[0040] The recessed portion 11a can increase the bonding area between the potting compound 3 and the battery pack 1, thus ensuring the bonding strength between the potting compound 3 and the battery pack 1.

[0041] In this embodiment, the recess 11a penetrates the large surface 11A of the battery cell 11 facing away from the terminal post 111. The recess 11a can be used to accommodate the terminal post 111 of the adjacent battery cell 11, making the arrangement of the battery cells 11 more compact and improving the energy density of the battery pack.

[0042] In some other embodiments of this application, the recess 11a penetrates the large surface 11A of the battery cell 11 facing the terminal post 111, and the terminal post 111 is directly disposed inside the recess 11a. The recess 11a serves to accommodate the terminal post 111 of the corresponding battery cell 11.

[0043] Furthermore, in this embodiment, the height difference between the upper contour of the pole post 111 and the upper contour of the potting compound 3 ranges from -15mm to 30mm.

[0044] Specifically, when the height difference between the upper contour of the electrode post 111 and the upper contour of the potting compound 3 is negative, it indicates that the electrode post 111 is completely within the height range of the potting compound 3, and the potting compound 3 does not extend beyond the upper contour of the electrode post 111. When the height difference between the upper contour of the electrode post 111 and the upper contour of the potting compound 3 is positive, it indicates that a portion of the lower end of the electrode post 111 is within the height range of the potting compound 3. In short, in this embodiment, the potting compound 3 covers at least a portion of the electrode post 111, serving an insulating function.

[0045] It is understandable that if the height difference between the upper contour of the terminal post 111 and the upper contour of the potting compound 3 is too large, it indicates that the area covered by the potting compound 3 on the terminal post 111 is too small, resulting in poor insulation protection. Conversely, if the height difference between the upper contour of the terminal post 111 and the upper contour of the potting compound 3 is too small, it indicates that too much adhesive is used, leading to high costs. Therefore, in this embodiment, the height difference between the upper contour of the terminal post 111 and the upper contour of the potting compound 3 has the above-mentioned value range, ensuring both insulation protection and cost control, making the battery pack of this embodiment competitive in the market.

[0046] In practice, the height difference between the upper contour of the terminal post 111 and the upper contour of the potting compound 3 can be -15mm, 0mm, 15mm, 30mm, etc. When the value is -15mm, the insulation protection effect of the terminal post 111 is the best under the premise of controllable cost; when the value is 30mm, the cost is the lowest while ensuring the insulation protection effect; when the value is 0mm or 15mm, a balance is achieved between the insulation protection effect and cost, and the quality of the battery pack is better.

[0047] Furthermore, please refer to Figures 1 and 4 for understanding. In this embodiment, the battery pack 1 also includes a conductive bus 12. The conductive bus 12 connects the terminals 111 of two adjacent battery cells 11. An insulating film 13 is attached to at least the wall of the conductive bus 12 facing away from the battery cell 11. A portion of the lower end of the insulating film 13 is located within the height range of the potting compound 3.

[0048] As configured above, the lower region of the conductive busbar 12 is insulated by separating it from the end beam 21 of the housing 2 through the potting compound 3, and the upper region of the conductive busbar 12 is insulated by separating it from the end beam 21 of the housing 2 through the insulating film 13. At the same time, a portion of the lower region of the insulating film 13 is located within the height range of the potting compound 3, that is, the insulating film 13 and the potting compound 3 partially overlap along the height direction, ensuring that the conductive busbar 12 is protected without dead angles and ensuring insulation performance.

[0049] As shown in Figure 1, in this embodiment, there are multiple battery cells 11, which are arranged in a direction perpendicular to the large surface 11A of the battery cells 11. There are also multiple conductive bars 12, which are distributed sequentially along the arrangement direction of the battery cells 11. The insulating film 13 is an integral structure that extends along the arrangement direction of the battery cells 11. Each conductive bar 12 is insulated from the end beam 21 of the housing 2 through the same insulating film 13, which is convenient to operate and improves integration efficiency.

[0050] In some other embodiments of this application, the battery pack includes a conductive bus 12, which connects the terminals 111 of two adjacent battery cells 11. Within the height range of the potting compound 3, the conductive bus 12 and the end beam 21 of the housing 2 are insulatedly connected by the potting compound 3.

[0051] Thus, in this embodiment, the conductive bus 12 no longer needs to be insulated by the insulating film 13, eliminating the step of attaching the insulating film 13. The part of the conductive bus 12 exposed to the potting compound 3 can use other insulation methods, such as spraying insulating materials, which ensures reliable insulation protection and improves integration efficiency.

[0052] In this embodiment, the ratio of the height of the potting compound 3 to the height of the end beam 21 of the box body 2 is in the range of 1 / 5 to 2 / 3.

[0053] It is understandable that if the ratio of the height of the potting compound 3 to the height of the end beam 21 of the housing 2 is too small, it indicates that the bonding area between the potting compound 3 and the end beam 21 of the housing 2 is too small, resulting in low bonding strength between the potting compound 3 and the end beam 21 of the housing 2. If the ratio is too large, it indicates that too much adhesive is used, leading to high cost. Based on this, in this embodiment, the ratio of the height of the potting compound 3 to the height of the end beam 21 of the housing 2 is within the above range, which ensures the bonding strength between the potting compound 3 and the end beam 21 of the housing 2 while keeping the cost under control, making the battery pack of this embodiment competitive in the market.

[0054] In practice, the ratio of the height of the potting compound 3 to the height of the end beam 21 of the housing 2 can be 1 / 5, 2 / 5, 1 / 2, 2 / 3, etc. When the ratio of the height of the potting compound 3 to the height of the end beam 21 of the housing 2 is 1 / 5, the amount of glue used is minimized while ensuring the bonding strength between the potting compound 3 and the end beam 21 of the housing 2, thus reducing costs to the greatest extent. When the ratio of the height of the potting compound 3 to the height of the end beam 21 of the housing 2 is 2 / 3, the bonding strength between the potting compound 3 and the end beam 21 of the housing 2 is the highest while keeping costs under control, thus improving the overall modal performance of the battery pack. When the ratio of the height of the potting compound 3 to the height of the end beam 21 of the housing 2 is 2 / 5 or 1 / 2, a balance is achieved between the overall modal performance and cost of the battery pack, thus improving the overall quality of the battery pack.

[0055] Please continue to refer to Figure 4. In this embodiment, the battery pack also includes an insulating bracket 4. The insulating bracket 4 is installed at the end of the battery cell 11 along its length and covers part of the metal area at the end of the battery cell 11 along its length. The potting compound 3 is partially connected between the insulating bracket 4 and the end beam 21 of the housing 2.

[0056] In this embodiment, the insulating bracket 4 has a support portion that snaps onto the lower end of the battery cell 11. When the battery pack 1 is installed inside the housing 2, the support portion is supported on the bottom wall of the housing 2, thereby improving the support stability of the battery pack 1 inside the housing 2. At the same time, the insulating bracket 4 can also achieve insulation between the battery pack 1 and the housing 2, improving the safety of the battery pack.

[0057] In some other embodiments of this application, within the height range of the potting compound 3, the metal region at the end of the battery cell 11 along its length is directly connected to the potting compound 3.

[0058] In other words, in this embodiment, the battery pack no longer has an insulating support 4. The metal area at the end of the battery cell 11 along its length is only insulated from the housing 2 by the potting compound 3. On the one hand, this saves the step of snapping the insulating support 4 onto the end of each battery cell 11 along its length, thus improving integration efficiency. On the other hand, the direct connection between the metal area at the end of the battery cell 11 along its length and the potting compound 3 also helps to improve the bonding strength between the battery cell 11 and the potting compound 3. At the same time, eliminating the insulating support 4 also reduces the number of parts in the battery pack, making the battery pack structure simpler and reducing material costs.

[0059] When the insulating support 4 is not provided, the lower end of each battery cell 11 can be integrally formed with a support part, and the battery pack 1 is supported on the bottom wall of the box 2 through each support part, thereby improving the support stability of the battery pack 1 inside the box 2.

[0060] Please continue to refer to Figure 1. In this embodiment, there are multiple battery cells 11. The multiple battery cells 11 are arranged in a direction perpendicular to the large surface 11A of the battery cells 11. The potting compound 3 extends along the arrangement direction of the battery cells 11. The two ends of the extension direction of the potting compound 3 are connected to the corresponding crossbeams of the housing 2.

[0061] In this way, the walls of the housing 2 around the battery pack 1 are connected to the battery pack 1 by potting compound 3, and the battery pack 1 and housing 2 form an integral structure, which is conducive to further improving the overall modal performance of the battery pack.

[0062] Please refer to Figure 5, which is a partial cross-sectional view of the battery pack in Figure 4 at the second angle.

[0063] In this embodiment, the battery pack also includes two parallel end insulating plates 5, the battery pack 1 is located between the two end insulating plates 5, an overflow groove is formed between the end insulating plates 5 and the housing 2, the potting compound 3 is partially filled inside the overflow groove and connects the end insulating plates 5 and the housing 2.

[0064] Specifically, as shown in Figure 5, a first overflow groove is formed between the end of the end insulating plate 5 along its length and the end beam 21 of the housing 2, and a second overflow groove is formed between the side of the end insulating plate 5 and the crossbeam of the housing 2 (not shown in the figure). Part of the potting compound 3 fills the first overflow groove and connects the end of the end insulating plate 5 along its length and the end beam 21 of the housing 2; part of the potting compound 3 fills the second overflow groove and connects the side of the end insulating plate 5 and the crossbeam of the housing 2.

[0065] Thus, in this embodiment, the overflow groove also serves to connect the end insulation plate 5 and the housing 2, improving the fixing yield of the end insulation plate 5 and the housing 2, and further improving the overall modal performance of the battery pack.

[0066] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery pack, characterized in that, The device includes a battery pack (1) and a housing (2). The battery pack (1) is disposed inside the housing (2). The battery pack (1) includes a battery cell (11). The battery cell (11) has a terminal (111). The terminal (111) is disposed on the large surface (11A) of the battery cell (11) and near the end of the battery cell (11) in the length direction. The battery pack also includes potting compound (3), which is at least partially connected between the end of the battery pack (1) in the length direction and the end beam (21) of the housing (2). The bonding area between the potting compound (3) and the metal area of ​​the battery pack (1) is S1, and the bonding area between the potting compound (3) and the housing (2) is S2. The value range of S1 / S2 is 1 / 5-1 / 2.

2. The battery pack according to claim 1, characterized in that, The battery cell (11) is provided with an explosion-proof valve, which is exposed outside the potting compound (3).

3. The battery pack according to claim 1, characterized in that, The battery cell (11) has a recess (11a) at its end along its length. The recess (11a) penetrates one of the large surfaces (11A) of the battery cell (11). A portion of the potting compound (3) is located inside the recess (11a) and is connected to at least a portion of the wall surrounding the recess (11a).

4. The battery pack according to claim 1, characterized in that, The height difference between the upper contour of the pole post (111) and the upper contour of the potting compound (3) ranges from -15mm to 30mm.

5. The battery pack according to any one of claims 1-4, characterized in that, The battery pack (1) further includes a conductive bus (12), which connects the terminals (111) of two adjacent battery cells (11). The conductive bus (12) has an insulating film (13) attached to at least the wall of the battery cell (11), and a portion of the lower end of the insulating film (13) is located within the height range of the potting compound (3).

6. The battery pack according to any one of claims 1-4, characterized in that, The battery pack (1) also includes a conductive bus (12), which connects the terminals (111) of two adjacent battery cells (11). Within the height range of the potting compound (3), the conductive bus (12) and the end beam (21) of the housing (2) are insulatedly connected by the potting compound (3).

7. The battery pack according to any one of claims 1-4, characterized in that, The ratio of the height of the potting compound (3) to the height of the end beam (21) of the box body (2) is in the range of 1 / 5 to 2 / 3.

8. The battery pack according to any one of claims 1-4, characterized in that, The battery pack also includes an insulating bracket (4), which is installed at the end of the battery cell (11) along its length and covers part of the metal area at the end of the battery cell (11) along its length. The potting compound (3) is partially connected between the insulating bracket (4) and the end beam (21) of the housing (2). Alternatively, within the height range of the potting compound (3), the metal region at the end of the battery cell (11) along its length direction is directly connected to the potting compound (3).

9. The battery pack according to any one of claims 1-4, characterized in that, The battery pack does not have an insulating support (4), and each battery cell (11) has an integrally formed support at its lower end. The battery pack (1) is supported on the bottom wall of the housing (2) by the support.

10. The battery pack according to any one of claims 1-4, characterized in that, The number of battery cells (11) is multiple, and the multiple battery cells (11) are arranged in a direction perpendicular to the large surface (11A). The potting compound (3) extends along the arrangement direction of the battery cells (11), and the two ends of the extension direction of the potting compound (3) are connected to the corresponding crossbeams of the housing (2).

11. The battery pack according to any one of claims 1-4, characterized in that, The battery pack also includes two parallel end insulating plates (5), the battery pack (1) is located between the two end insulating plates (5), an overflow groove is formed between the end insulating plates (5) and the housing (2), the potting compound (3) partially fills the overflow groove and connects the end insulating plates (5) and the housing (2).

12. The battery pack according to claim 11, characterized in that, A first overflow groove is formed between the end of the end insulating plate (5) along its length and the end beam (21) of the box body (2), and a second overflow groove is formed between the side of the end insulating plate (5) and the crossbeam of the box body (2). Part of the potting compound (3) fills the first overflow groove and connects the end of the end insulating plate (5) along its length and the end beam (21) of the box body (2). Part of the potting compound (3) fills the second overflow groove and connects the side of the end insulating plate (5) and the crossbeam of the box body (2).

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