Battery pack

Abstract

Battery pack, characterized in that it comprises a battery group (1) and a housing (2), wherein the battery group (1) is provided inside the housing (2), wherein the battery group (1) comprises a battery cell (11), wherein the battery cell (11) has an electrode column (111), wherein the electrode column (111) is provided on a large area (11A) of the battery cell (11) and in the vicinity of an end section in a longitudinal direction of the battery cell (11); wherein the battery pack further comprises a potting compound (3) wherein at least a part of the potting compound (3) is connected between the end section in the longitudinal direction of the battery group (1) and an end carrier (21) of the housing (2), wherein the adhesive surface between the potting compound (3) and a metal area of ​​the battery group (1) is S1, wherein the adhesive surface between the potting compound (3) and the housing (2) is S2, wherein the value of S1 / S2 is in a range of 1 / 5 to 1 / 2.

Description

Technical field

[0001] The present application relates to the technical field of batteries, in particular a battery pack. Technical background

[0002] In the structure of a battery pack of the relevant technology, a pressure plate is provided on top of the battery pack inside the casing to limit the position and prevent misalignment of the battery cells when the battery pack vibrates vertically. However, the pressure plate must occupy the vertical space within the casing, which reduces the energy density of the battery pack. Furthermore, in the structure of a battery pack of the relevant technology, the casing is usually sealed to prevent foreign matter or water vapor from entering the casing from the outside. However, foreign matter or water vapor inside the casing can still penetrate into the battery pack, leading to short circuits and other problems. Content of the invention

[0003] The purpose of the present application is to provide a battery pack that improves the installation stability of the battery pack, increases the energy density of the battery pack, and ensures the insulation and sealing performance of the battery pack.

[0004] To solve the above technical problems, the present application provides a battery pack comprising a battery group and a housing, wherein the battery group is provided inside the housing, wherein the battery group comprises a battery cell, wherein the battery cell has an electrode column, wherein the electrode column is provided on a large area of ​​the battery cell and near an end section in a longitudinal direction of the battery cell;

[0005] The battery pack further comprises a potting compound wherein at least a part of the potting compound is connected between the end section in the longitudinal direction of the battery group and an end carrier of the housing, wherein the bonding surface between the potting compound and a metal area of ​​the battery group is S1, wherein the bonding surface between the potting compound and the housing is S2, wherein the value of S1 / S2 is in a range of 1 / 5 to 1 / 2.

[0006] Optionally, the battery cell is equipped with an explosion protection valve, whereby the explosion protection valve is exposed to the potting adhesive.

[0007] Optionally, a recess section is provided at the end section in the longitudinal direction of the battery cell, wherein the recess section passes through one of the large surfaces of the battery cell, wherein a part of the potting adhesive is located within the recess section and is connected to at least a part of a wall section enclosing the recess section.

[0008] Optionally, the height difference between an upper end profile of the electrode column and the upper end profile of the potting compound is in a range of -15 mm to 30 mm.

[0009] Optionally, the battery group further comprises a conductive row, wherein the conductive row connects the electrode column of two adjacent battery cells, wherein an insulating film is bonded to the wall section of the conductive row facing away from at least the battery cell, wherein a part at a lower end of the insulating film is located within a height range of the potting adhesive.

[0010] Optionally, the battery group further comprises a conductive row, wherein the conductive row connects the electrode column of two adjacent battery cells, wherein the conductive row and the end carrier of the housing are insulatedly connected to each other by means of the potting adhesive within a height range of the potting adhesive.

[0011] Optionally, the ratio between the height of the potting compound and the height of the end support of the housing is in a range of 1 / 5 to 2 / 3.

[0012] Optionally, the battery pack further includes an insulating bracket, wherein the insulating bracket is installed on the end section in the longitudinal direction of the battery cell and covers part of the metal area of ​​the end section in the longitudinal direction of the battery cell, with part of the potting compound being bonded between the insulating bracket and the end carrier of the housing;

[0013] or the metal area at the end section in the longitudinal direction of the battery cell is directly connected to the potting adhesive within the height range of the potting compound.

[0014] Optionally, the number of battery cells is a plurality, wherein the plurality of battery cells is arranged in a direction perpendicular to the large area, the potting compound extending along the arrangement direction of the battery cells, the two end sections of the potting compound being connected in the extension direction to corresponding cross members of the housing.

[0015] Optionally, the battery pack further comprises two adjacent end insulating plates, wherein the battery group is located between the two end insulating plates, wherein an adhesive overflow groove is formed between the end insulating plates and the housing, wherein part of the potting adhesive fills the interior of the adhesive overflow groove and joins the end insulating plates and the housing together.

[0016] The battery pack of the present application has the following technical implications:

[0017] In this embodiment of the battery pack, the electrode column is positioned over a large area of ​​the battery cell and near the end section in the longitudinal direction of the battery cell, and the electrode column must be connected to the conductive array. This particular arrangement of the electrode column makes it impossible to insulate the end section in the longitudinal direction of the battery cell with a conventional insulating film. Therefore, in this embodiment, a potting compound is provided at least between the end section in the longitudinal direction of the battery pack and the end support of the housing. The potting compound is bonded directly to the metal area of ​​the battery pack, thus providing insulation, protection, and sealing.In this way, the ingress of foreign bodies or water vapor into the battery group from the end section in the longitudinal direction of the battery group is prevented, and this potting process bonds the potting adhesive and the end section more firmly together in the longitudinal direction of the battery group, resulting in better insulation and protection as well as better sealing.

[0018] Furthermore, in this embodiment, the battery cell is an elongated strip structure, and if the ends are not fixed along the length of the battery cell, the battery cell tends to deform. In this embodiment, the battery assembly and the housing as a whole are bonded using a potting compound, so that the battery assembly is more stably installed in the housing, misalignment of the battery cells is prevented when the battery assembly vibrates vertically, deformation of the battery cells is prevented, the overall structural strength of the battery pack is improved, and the modal performance of the battery pack is improved.In the present application, the pressure plate in the battery pack of the related technology is eliminated, thereby saving the interior space of the housing and improving the energy density of the battery pack, and the separate fastening step of the battery group in the battery pack of the related technology is eliminated, thereby simplifying the assembly process of the battery group and improving assembly efficiency.

[0019] In short, in the battery pack of this embodiment, the potting compound can simultaneously perform the tasks of insulation, fastening and sealing, improve the installation stability of the battery group, improve the energy density of the battery pack and ensure the insulation and sealing performance of the battery group.

[0020] Furthermore, the S1 to S2 ratio must be controlled to ensure that the potting compound bonds uniformly to both the battery assembly and the housing end carrier, preventing any adhesive failure. An excessively high S1 to S2 ratio indicates that the bond strength between the potting compound and the battery assembly is significantly greater than the bond strength between the potting compound and the housing end carrier.When using battery packs, the cured adhesive fatigues and ages under prolonged vibration conditions due to the force exerted, and the adhesive layer can then easily break, leading to a loss of adhesive strength between the potting compound and the end carrier of the housing, thus negating the effect of improving the modal performance of the battery pack; Conversely, if the ratio of S1 to S2 is too small, this indicates that the adhesive strength between the potting compound and the battery pack is insufficient, and the adhesive strength between the potting compound and the battery pack is much smaller than that between the potting compound and the end carrier of the housing.When battery packs are used, the cured adhesive fatigues and ages under prolonged vibration conditions due to the force exerted, and the adhesive layer can then easily break down, leading to a loss of adhesive strength between the potting compound and the battery assembly, 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 above range of values ​​to ensure that the adhesive strength between the potting compound and the battery assembly, as well as the adhesive strength between the potting compound and the end carrier of the housing, is uniform, and to prevent the occurrence of adhesive failure and other problems during the use of the battery pack. Images Fig. Figure 1 shows a partial sectional view of a first concrete embodiment of a battery pack in the present application; Fig. Figure 2 shows a schematic representation of the structure of a battery cell in the battery pack of Fig. 1; Fig. Figure 3 shows a schematic structure of the battery cell in Fig. 2 at a second angle; Fig. Figure 4 is a schematic representation of the structure of the battery pack of Fig. 1, if the insulating film is covered; Fig. Figure 5 shows a partial cutaway view of the battery pack in Fig. 1 in a second angle;

[0021] Reference numeral list in the Fig. 1 to Fig. 5: 1 - Battery group; 11 - Battery cell; 111 - Electrode stack; 11A - Large area; 11a - Recess section; 12 - Conductive row; 13 - Insulating film; 2- Housing; 21- End carrier; 3- Potting adhesive; 4- Insulating bracket; 5- End insulating plate. Description of embodiments

[0022] In order to enable the person skilled in the art to better understand the technical solution of the present application, a detailed description of the present application follows in conjunction with the attached drawings and specific embodiments.

[0023] As in Fig. 1, Fig. 2, Fig. 3 to Fig. 4 shown, shows Fig. 1 a partial sectional view of a first concrete embodiment of a battery pack in the present application; Fig. Figure 2 shows a schematic representation of the structure of a battery cell in the battery pack of Fig. 1; Fig. Figure 3 shows a schematic structure of the battery cell in Fig. 2 at a second angle; Fig. Figure 4 is a schematic representation of the structure of the battery pack of Fig. 1, if the insulating film is covered.

[0024] One embodiment provides a battery pack comprising a battery group height1height range and a housing height2height range, wherein the battery group height1height range is provided within the housing height2height range, wherein the battery group height1height range comprises a battery cell height11height range, wherein the battery cell height11height range has an electrode column height111height range, wherein the electrode column height111height range is provided on a large area height11Aheight range of the battery cell height11height range and near an end section in a longitudinal direction of the battery cell height11height range;

[0025] The battery pack further comprises a potting compound height range 3 height range, wherein at least a part of the potting compound height range 3 height range is connected between the end section in the longitudinal direction of the battery group height range 1 height range and an end carrier height range 21 height range of the housing height range 2 height range, wherein the adhesive surface between the potting compound height range 3 height range and a metal area of ​​the battery group height range 1 height range is S1, wherein the adhesive surface between the potting compound height range 3 height range and the housing height range 2 height range is S2, wherein the value of S1 / S2 is in a range of 1 / 5 to 1 / 2.

[0026] The adhesive area described here between the potting compound 3 and the metal area of ​​the battery group 1 is S1, i.e., the area of ​​the exposed metal housing at the end section of the row of batteries opposite battery group 1 and the end carrier 21 is S1. If battery group 1 is provided with the insulating bracket 4, i.e., the area of ​​the end section of the row of batteries opposite battery group 1 and the end carrier 21 that is not covered by the insulating bracket 4 is S1, including the surfaces of the batteries and the end carrier 21 that are parallel to each other or at an angle. The adhesive area between the potting compound 3 and the housing 2 is S2, i.e., the area on the surfaces of the housing 2 where the end carrier 21 and battery group 1 are opposite each other is S2.

[0027] In the battery pack of this embodiment, the electrode column 111 is provided on a large area 11A of the battery cell 11 and near the end section in the longitudinal direction of the battery cell 11, and the electrode column 111 must be connected to the conductive array. This particular arrangement of the electrode column 111 makes it impossible to insulate the end section in the longitudinal direction of the battery cell 11 with a conventional insulating film. For this reason, in this embodiment, a potting compound 3 is provided at least between the end section in the longitudinal direction of the battery group 1 and the end support 21 of the housing 2. The potting compound 3 is bonded directly to the metal area of ​​the battery group 1, which serves to insulate and protect the battery group 1 as well as to seal it.In this way, the ingress of foreign bodies or water vapor into battery group 1 from the end section in the longitudinal direction of battery group 1 is prevented, and this potting process bonds the potting adhesive 3 and the end section more firmly together in the longitudinal direction of battery group 1, resulting in better insulation and protection as well as better sealing.

[0028] Furthermore, in this embodiment, the battery cell 11 is an elongated strip structure, and if the ends are not fixed along the length of the battery cell 11, the battery cell 11 tends to deform. In this embodiment, the battery assembly 11 and the housing 2 are bonded together as a whole using a potting compound 3, so that the battery assembly 11 is installed more stably in the housing 2, misalignment of the battery cells 11 is avoided when the battery assembly 1 is vibrated along the vertical direction, deformation of the battery cells 11 is prevented, the overall structural strength of the battery pack is improved, and the modal performance of the battery pack is improved.In the present application, the pressure plate in the battery pack of the related technology is eliminated, thereby saving the interior space of the housing 2 and improving the energy density of the battery pack, and the separate fastening step of the battery group in the battery pack of the related technology is eliminated, thereby simplifying the assembly process of the battery group and improving assembly efficiency.

[0029] In short, in the battery pack of this embodiment 3, the potting compound can simultaneously perform the tasks of insulation, fastening and sealing, improve the installation stability of the battery group 1, improve the energy density of the battery pack and improve the insulation and sealing performance of the battery group 1.

[0030] Furthermore, the ratio of S1 to S2 must be controlled to ensure that the potting compound 3 bonds uniformly to both the battery group 1 and the end carrier 21 of the housing 2, and that no adhesive failure occurs. If the ratio of S1 to S2 is too high, it indicates that the adhesive strength between the potting compound 3 and the battery group 1 is much greater than the adhesive strength between the potting compound 3 and the end carrier 21 of the housing 2.When using battery packs, the cured adhesive fatigues and ages under prolonged vibration conditions due to the force, and then the adhesive layer can easily break, leading to a loss of adhesive strength between the potting compound 3 and the end carrier 21 of the housing 2, thus negating the effect of improving the modal performance of the battery pack; Conversely, if the ratio of S1 to S2 is too small, this indicates that the adhesive strength between the potting compound 3 and the battery group 1 is insufficient, and the adhesive strength between the potting compound 3 and the battery group 1 is much smaller than that between the potting compound 3 and the end carrier 21 of the housing 2.When battery packs are used, the cured adhesive fatigues and ages under prolonged vibration conditions due to the force exerted, and the adhesive layer can then easily break, leading to a loss of adhesive strength between the potting compound 3 and the battery group 1, 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 above range of values ​​to ensure that the adhesive strength between the potting compound 3 and the battery group 1, as well as the adhesive strength between the potting compound 3 and the end carrier 21 of the housing 2, is uniform, and to prevent the occurrence of adhesive failure and other problems during the use of the battery pack.

[0031] Furthermore, in this embodiment, the battery cell 11 is provided with an explosion protection valve, wherein the explosion protection valve is exposed to the potting adhesive 3.

[0032] In this way, the potting compound 3 avoids the failure problem of the explosion protection valve not being able to open due to a blockage of the explosion protection valve, and ensures that the explosion protection valve opens automatically to relieve the pressure when the internal pressure of the battery cell 11 is too high, thus improving the safety performance of the battery pack.

[0033] Furthermore, as in Fig. 2 and Fig. As shown in Figure 4, in this embodiment a recess section 11a is provided at the end section in the longitudinal direction of the battery cell 11, wherein the recess section 11a extends through one of the large surfaces 11A of the battery cell 11, wherein a part of the potting adhesive 3 is located within the recess section 11a and is connected to at least a part of a wall section enclosing the recess section 11a.

[0034] As described above, the arrangement of the recess section 11a can increase the adhesive area between the potting compound 3 and the battery group 1 to ensure the adhesive strength between the potting compound 3 and the battery group 1.

[0035] In this embodiment, the recess section 11a extends through the large area 11A of the battery cell 11 facing away from the electrode column 111, and the recess section 11a can be used to accommodate the electrode column 111 of the adjacent battery cell 11 in order to make the arrangement between the battery cells 11 more compact and to improve the energy density of the battery pack.

[0036] In some other embodiments of the present application, the recess section 11a extends through the large area 11A of the battery cell 11 facing the electrode column 111, the electrode column 111 is provided directly within the recess section 11a, and the recess section 11a is used to receive the electrode column 111 of the corresponding battery cell 11.

[0037] Furthermore, in this embodiment, the height difference between an upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 is in a range of -15 mm to 30 mm.

[0038] If the height difference between the upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 is negative, this means that the electrode column 111 is entirely within the height range of the potting compound 3 and that the potting compound 3 does not extend over the upper end profile of the electrode column 111. If the height difference between the upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 is positive, this indicates that part of the lower end of the electrode column 111 is within the height range of the potting compound 3. In short, in this embodiment, the potting compound 3 covers at least part of the electrode column 111 to act as an insulator.

[0039] It is understood that if the height difference between the upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 is too large, this means that the area of ​​the electrode column 111 covered by the potting compound 3 is too small and the insulating protection is poor. Conversely, if the height difference between the upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 is too small, this indicates that too much compound is being used and costs are high. Therefore, in this embodiment, the height difference between the upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 has a range of values ​​as described above, which ensures the insulating protection and keeps costs controllable, thus making the battery pack of this embodiment competitive on the market.

[0040] In practice, the height difference between the upper end profile of the electrode column 111 and the upper end profile of the potting compound 3 can be -15 mm, 0 mm, 15 mm, 30 mm, etc. At a value of -15 mm, the insulation performance of the electrode column 111 is optimal, assuming controllable costs; at a value of 30 mm, costs are lowest, ensuring insulation performance; at values ​​of 0 mm and 15 mm, a balance is achieved between insulation performance and cost, resulting in improved battery pack quality.

[0041] Furthermore, as in Fig. 1 and Fig. As shown in Figure 4, in this embodiment the battery group further comprises a conductive row, wherein the conductive row connects the electrode column of two adjacent battery cells, wherein an insulating film is bonded to the wall section of the conductive row facing away from at least the battery cell, wherein a part of the insulating film is located at a lower end within a height range of the potting adhesive.

[0042] By the above arrangements, the lower end of the conductive row 12 is insulated from the end carrier 21 of the housing 2 by the potting compound 3 to achieve insulation, and the upper end of the conductive row 12 is insulated from the end carrier 21 of the housing 2 by the insulating film 13 to achieve insulation; at the same time, part of the area at the lower end of the insulating film 13 is located within the height range of the potting compound 3, i.e., the insulating film 13 and the potting compound 3 partially overlap along the height direction to ensure the insulation protection of the conductive row 12 and the insulating performance.

[0043] As from Fig. As can be seen in Figure 1, in this embodiment the number of battery cells 11 is multiple, and the multiple battery cells 11 are arranged along a direction perpendicular to the large area 11A of the battery cell 11. The number of conductive rows 12 is also multiple, and the multiple conductive rows 12 are sequentially distributed along the arrangement direction of the battery cell 11. The insulating film 13 is a single-piece structure. The insulating film 13 extends along the arrangement direction of the battery cell 11, and each of the conductive rows 12 is insulated from the end support 21 of the housing 2 by the same insulating film 13, which is easy to use and improves integration efficiency.

[0044] In some other embodiments of the present application, the battery group 1 further comprises a conductive row 12, wherein the conductive row 12 connects the electrode column 111 of two adjacent battery cells 11, wherein the conductive row 12 and the end carrier 21 of the housing are insulatorily connected to each other by means of the potting compound 3 within a height range of the potting compound 3.

[0045] In this embodiment, the conductive row 12 is no longer insulated and protected by the insulating film 13, thus eliminating the step of applying the insulating film 13, and the part of the conductive row 12 exposed to the potting compound 3 can be insulated using other insulation methods, such as spraying on insulating material, etc., to ensure reliable insulation and protection and to improve integration efficiency.

[0046] In this embodiment, the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is in a range of 1 / 5 to 2 / 3.

[0047] If the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is too small, this means that the bonding area between the potting compound 3 and the end support 21 of the housing 2 is too small, resulting in insufficient bond strength between the potting compound 3 and the end support 21 of the housing 2. If the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is too large, this means that too much compound is used and the costs are high. In this embodiment, the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is within the above range, thus ensuring sufficient bond strength between the potting compound 3 and the end support 21 of the housing 2 and keeping costs controllable, so that the battery pack of this embodiment is competitive on the market.

[0048] In practice, the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 can be 1 / 5, 2 / 5, 1 / 2, 2 / 3, etc.If the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is 1 / 5, the amount of compound used is minimized, provided that the bond strength between the potting compound 3 and the end support 21 of the housing 2 is ensured, thereby minimizing costs; if the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is 2 / 3, the bond strength between the potting compound 3 and the end support 21 of the housing 2 is highest, provided that costs are controllable, thereby improving the overall modal performance of the battery pack; if the ratio between the height of the potting compound 3 and the height of the end support 21 of the housing 2 is 2 / 5, 1 / 2, a balance is achieved between the overall modal performance of the battery pack and the costs, thereby improving the overall quality of the battery pack.

[0049] As in Fig. As shown in Figure 4, in this embodiment the battery pack further comprises an insulating holder 4, wherein the insulating holder 4 is installed on the end section in the longitudinal direction of the battery cell 11 and covers a part of the metal area of ​​the end section in the longitudinal direction of the battery cell 11, wherein a part of the potting compound 3 is connected between the insulating holder 4 and the end carrier 21 of the housing 2.

[0050] In this embodiment, the insulating bracket 4 has a support section that snaps into the lower end of the battery cell 11, and the support section rests on the bottom wall of the housing 2 when the battery group 1 is installed in the housing 2, thereby improving the support stability of the battery pack 1 in the housing 2; at the same time, the insulating bracket 4 also provides insulation between the battery group 1 and the housing 2, thereby improving the safety of the battery pack.

[0051] In some other embodiments of the present application, the metal area at the end section in the longitudinal direction of the battery cell 11 is directly connected to the potting adhesive 3 within the height area of ​​the potting compound 3.

[0052] In other words, the battery pack of the exemplary embodiment is no longer provided with the insulating holder 4, and the metal area at the end section in the longitudinal direction of the battery cell 11 is only insulated from the housing 2 by the potting compound 3. On the one hand, the step of snapping the insulating holder 4 into place at the end section in the longitudinal direction of the battery cell 11 is eliminated, thus improving integration efficiency; on the other hand, the metal area at the end section in the longitudinal direction of the battery cell 11 is directly connected to the potting compound 3, which also contributes to improved bond strength between the battery cell 11 and the potting compound 3; at the same time, the elimination of the insulating holder 4 reduces the number of battery pack components, simplifying the battery pack structure and lowering material costs.

[0053] If the insulating support 4 is not provided, the lower end of each battery cell 11 can be formed in one piece with a support section, and the battery group 1 is supported by each support section on the bottom wall of the housing 2 to improve the stability of the support of the battery group 1 inside the housing 2.

[0054] As in Fig. 1 shown, in this embodiment the number of battery cells 11 is a plurality, wherein the plurality of battery cells 11 is arranged in a direction perpendicular to the large area 11A, wherein the potting compound 3 extends along the arrangement direction of the battery cells 11, wherein the two end sections of the potting compound 3 are connected in the extension direction to corresponding cross members of the housing 2.

[0055] In this way, the wall sections of the housing 2, which are located around the battery group 1, are connected to the battery group 1 by means of the potting adhesive 3, and the battery group 1 and the housing 2 form a complete structure, which leads to a further improvement in the overall modal performance of the battery pack.

[0056] As in Fig. 5 shown, shows Fig. 5 a partial cutaway view of the battery pack in Fig. 4 in a second angle.

[0057] In this embodiment, the battery pack further comprises two adjacent end insulating plates 5, wherein the battery group 1 is located between the two end insulating plates 5, wherein an adhesive overflow groove is formed between the end insulating plates 5 and the housing 2, wherein a portion of the potting adhesive 3 fills the interior of the adhesive overflow groove and connects the end insulating plates 5 and the housing 2.

[0058] In particular, as in Fig. As shown in Figure 5, a first adhesive overflow groove is formed between the end section in the longitudinal direction of the end insulating plate 5 and the end support 21 of the housing 2, while a second adhesive overflow groove is formed between a side of the end insulating plate 5 and the cross member of the housing 2 (not shown in the figures), wherein a part of the potting adhesive 3 fills the interior of the first adhesive overflow groove and connects the end section in the longitudinal direction of the end insulating plate 5 and the end support 21 of the housing 2, and wherein a part of the potting adhesive 3 fills the interior of the second adhesive overflow groove and connects the side of the end insulating plate 5 and the cross member of the housing 2.

[0059] In this way, the adhesive overflow groove of this embodiment also serves to connect the end insulating plate 5 and the housing 2, which improves the fastening performance of the end insulating plate 5 and the housing 2 and further increases the overall modal performance of the battery pack.

[0060] The foregoing is only a preferred embodiment of the present application, and it should be noted that for a person of ordinary knowledge in the field, a number of improvements and embellishments can be made without derogation from the principles of the present application, and these improvements and embellishments should also be regarded as being within the scope of protection of the present application.

Claims

[1] Battery pack, characterized by , comprising a battery group (1) and a housing (2), wherein the battery group (1) is provided within the housing (2), wherein the battery group (1) comprises a battery cell (11), wherein the battery cell (11) has an electrode column (111), wherein the electrode column (111) is provided on a large area (11A) of the battery cell (11) and near an end section in a longitudinal direction of the battery cell (11); wherein the battery pack further comprises a potting compound (3) wherein at least a part of the potting compound (3) is connected between the end section in the longitudinal direction of the battery group (1) and an end carrier (21) of the housing (2), wherein the adhesive surface between the potting compound (3) and a metal area of ​​the battery group (1) is S1, wherein the adhesive surface between the potting compound (3) and the housing (2) is S2, wherein the value of S1 / S2 is in a range of 1 / 5 to 1 / 2. [2] Battery pack according to claim 1, characterized by , that the battery cell (11) is provided with an explosion protection valve, wherein the explosion protection valve is exposed to the potting adhesive (3). [3] Battery pack according to claim 1, characterized by , that a recess section (11a) is provided at the end section in the longitudinal direction of the battery cell (11), wherein the recess section (11a) passes through one of the large surfaces (11A) of the battery cell (11), wherein a part of the potting adhesive (3) is located within the recess section (11a) and is connected to at least a part of a wall section enclosing the recess section (11a). [4] Battery pack according to claim 1, characterized by , that the height difference between an upper end profile of the electrode column (111) and the upper end profile of the potting compound (3) is in a range of -15 mm to 30 mm. [5] Battery pack according to any one of claims 1 to 4, characterized by, that the battery group (1) further comprises a conductive row (12), wherein the conductive row (12) connects the electrode column (111) of two adjacent battery cells (11), wherein an insulating film (13) is bonded to the wall section of the conductive row (12) facing away from at least the battery cell (11), wherein a part at a lower end of the insulating film (13) is located within a height region of the potting compound (3). [6] Battery pack according to any one of claims 1 to 4, characterized by , that the battery group (1) further comprises a conductive row (12), wherein the conductive row (12) connects the electrode column (111) of two adjacent battery cells (11), wherein the conductive row (12) and the end carrier (21) of the housing are insulated together by means of the potting compound (3) within a height range of the potting compound (3). [7] Battery pack according to any one of claims 1 to 4, characterized by, that the ratio between the height of the potting compound (3) and the height of the end carrier (21) of the housing (2) is in a range of 1 / 5 to 2 / 3. [8] Battery pack according to any one of claims 1 to 4, characterized by , that the battery pack further comprises an insulating holder (4), wherein the insulating holder (4) is installed at the end section in the longitudinal direction of the battery cell (11) and covers a part of the metal area of ​​the end section in the longitudinal direction of the battery cell (11), wherein a part of the potting compound (3) is connected between the insulating holder (4) and the end carrier (21) of the housing (2); or wherein the metal area at the end section in the longitudinal direction of the battery cell (11) is directly connected to the potting compound (3) within the height area of ​​the potting compound (3). [9] Battery pack according to any one of claims 1 to 4, characterized by, that the battery pack is not provided with an insulating support (4), wherein a support section at the lower end of each battery cell is formed in one piece, wherein the battery cell (1) is supported by each of the support sections against a bottom wall of the housing (2). [10] Battery pack according to any one of claims 1 to 4, characterized by , that the number of battery cells (11) is a plurality, wherein the plurality of battery cells (11) is arranged in a direction perpendicular to the large area (11A), wherein the potting compound (3) extends along the arrangement direction of the battery cells (11), wherein the two end sections of the potting compound (3) are connected in the extension direction to corresponding cross members of the housing (2). [11] Battery pack according to any one of claims 1 to 4, characterized by, that the battery pack further comprises two end insulating plates (5) arranged side by side, wherein the battery group (1) is located between the two end insulating plates (5), wherein an adhesive overflow groove is formed between the end insulating plates (5) and the housing (2), wherein a portion of the potting adhesive (3) fills the interior of the adhesive overflow groove and connects the end insulating plates (5) and the housing (2) together. [12] Battery pack according to claim 11, characterized by, that a first adhesive overflow groove is formed between the end section in the longitudinal direction of the end insulating plate (5) and the end support (21) of the housing (2), while a second adhesive overflow groove is formed between a side of the end insulating plate (5) and the cross member of the housing (2), wherein a part of the potting adhesive (3) fills the interior of the first adhesive overflow groove and connects the end section in the longitudinal direction of the end insulating plate (5) and the end support (21) of the housing (2), wherein a part of the potting adhesive (3) fills the interior of the second adhesive overflow groove and connects the side of the end insulating plate (5) and the cross member of the housing (2).

Images