Battery pack

Abstract

This application relates to the field of energy storage system technology and discloses a battery pack, including a housing, battery components, and busbars. The housing has a receiving cavity. The battery components are disposed within the receiving cavity and include a heat dissipation bracket and multiple batteries. The heat dissipation bracket has multiple placement holes, and each battery is placed in a corresponding placement hole, with the outer wall of the battery connected to the hole wall. Busbars are provided on both sides of the battery component, and each battery has electrodes at both ends. The electrodes are connected to the adjacent busbars to allow heat conduction from the battery electrodes to the busbars. During use, the heat generated near the two ends of the battery is transferred to the busbars through the electrodes, while the heat generated in the middle of the battery is transferred to the heat dissipation bracket through the outer wall of the battery. This ensures effective heat dissipation at both ends and the middle of the battery, preventing heat accumulation in the middle due to insufficient heat dissipation and affecting performance, resulting in better temperature uniformity of the battery.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, specifically to a battery pack. Background Technology

[0002] A battery pack is a device consisting of multiple batteries, an electrical system, a thermal management system, a housing, a battery management system, and other components. It is an indispensable part of an energy storage system.

[0003] Each individual battery generates heat during operation. Overheating can impair performance and, in severe cases, cause damage. Therefore, effective heat dissipation within the battery pack is crucial. Current battery packs often only incorporate heat dissipation structures at the busbars at both ends of the battery. While the electrodes at the battery ends are connected to the busbars, allowing heat generated there to be dissipated quickly, heat in the middle of the battery must be conducted back to the ends before being dissipated to the busbars, resulting in insufficient heat dissipation. This leads to a temperature imbalance, with lower temperatures at the ends and higher temperatures in the middle.

[0004] Therefore, how to solve or improve the problem of poor battery temperature uniformity in battery packs in related technologies has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, this application provides a battery pack to solve or improve the problem of poor battery temperature uniformity in related technologies.

[0006] In a first aspect, this application provides a battery pack, comprising:

[0007] The housing has a receiving cavity;

[0008] A battery assembly is disposed within the receiving cavity. The battery assembly includes a heat dissipation bracket and multiple batteries. The heat dissipation bracket is provided with multiple placement holes, and each battery is disposed in a corresponding placement hole. The outer wall of the battery is connected to the hole wall of the placement hole.

[0009] Busbars are provided on both sides of the battery assembly. Each end of the battery has an electrode, which is connected to the adjacent busbar so that the electrode of the battery can conduct heat to the busbar.

[0010] Optionally, it also includes:

[0011] A first thermal pad is attached to the side of the busbar facing away from the electrode;

[0012] The first heat sink is attached to the side of the first thermal pad that is away from the busbar.

[0013] Optionally, it also includes:

[0014] A thermally conductive adhesive layer is provided, through which the first heat sink is connected to the inner wall of the receiving cavity.

[0015] Optionally, it also includes:

[0016] The U-shaped sealing strip has a first side and a second side that are opposite to each other. The first side of the U-shaped sealing strip is in contact with the inner wall of the receiving cavity, and the second side of the U-shaped sealing strip is in contact with the first heat sink. The inner wall of the receiving cavity, the U-shaped sealing strip, and the first heat sink form a top-open potting groove.

[0017] The thermally conductive adhesive layer is disposed in the potting groove and is respectively attached to the inner wall of the first heat sink and the receiving cavity.

[0018] Optionally, at least two heat dissipation brackets are provided, and each heat dissipation bracket is arranged sequentially at intervals along the extension direction of the placement hole. There are two busbars between two adjacent heat dissipation brackets. The battery pack further includes:

[0019] The second heat sink is connected between the two busbars between two adjacent heat sink brackets;

[0020] The second thermal pad is connected between the busbar and the second heat sink.

[0021] Optionally, the battery has a first end and a second end, and the busbars arranged on both sides of the battery assembly are a first busbar and a second busbar, respectively. The first busbar is arranged on one side of the heat dissipation bracket, and the second busbar is arranged on the other side of the heat dissipation bracket. The first busbar is connected to the electrode of the first end of the battery, and the second busbar is connected to the electrode of the second end of the battery.

[0022] Optionally, the first busbar has a plurality of first convex shells protruding in the direction close to the battery, each first convex shell having a first convex surface, the first convex surface being welded to the electrode at the first end of the battery;

[0023] And / or, the second busbar has a plurality of second convex shells protruding in the direction of proximity to the battery, the second convex shells having a second convex surface, the second convex surface being welded to the electrode at the second end of the battery.

[0024] Optionally, the housing includes:

[0025] A cylindrical body is provided with the receiving cavity, and an opening is provided on the cylindrical body, the opening communicating with the receiving cavity;

[0026] A cover body is connected to the cylinder body and seals the opening.

[0027] Optionally, the outer wall of the cylinder is provided with heat dissipation denticles.

[0028] Optionally, it also includes:

[0029] A battery management system unit is connected to the cover, and each of the busbars is connected to the battery management system unit.

[0030] This application provides a battery pack, including a housing, a battery assembly, and busbars. The housing contains a receiving cavity. The battery assembly includes a heat dissipation bracket and a battery. Multiple placement holes are formed through the heat dissipation bracket. The battery is placed within the placement holes, with its outer wall connected to the hole wall, allowing heat transfer between the battery's outer wall and the heat dissipation bracket. The electrodes at both ends of the battery are positioned close to the two ends of the placement holes. Busbars are located on both sides of the battery assembly, with each battery's electrode positioned close to a busbar, connecting each busbar to the electrode of the adjacent battery. During use, heat generated at both ends of the battery is transferred to the busbars through the electrodes, while heat generated in the middle of the battery is transferred to the heat dissipation bracket through the battery's outer wall. This ensures effective heat dissipation at both ends and the middle of the battery, preventing heat buildup in the middle that could affect performance and resulting in better temperature uniformity of the battery. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is an exploded view of a battery pack according to an embodiment of this application;

[0033] Figure 2 This is a cross-sectional schematic diagram of a battery pack according to an embodiment of this application;

[0034] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0035] Figure 4 for Figure 2 A magnified view of part B in the diagram;

[0036] Figure 5 for Figure 2 A magnified view of part of C;

[0037] Figure 6 This is a schematic diagram of a heat dissipation bracket structure for a battery pack according to an embodiment of the application.

[0038] Figure 7 This is a schematic diagram of the first busbar structure of a battery pack according to an embodiment of the application;

[0039] Figure 8 This is a schematic diagram of the second busbar structure of a battery pack according to an embodiment of the application;

[0040] Figure 9 This is a side view of a battery pack with the concealed cylindrical body according to an embodiment of the application.

[0041] Figure 10 This is a top view of a battery pack concealed by a cover according to an embodiment of the application.

[0042] Figure 11 for Figure 10 A magnified view of part of D;

[0043] Figure 12 for Figure 10 A magnified view of part of E in the diagram;

[0044] Figure 13 for Figure 10 A magnified view of part of F;

[0045] Figure 14 This is a schematic diagram of the external structure of a battery pack according to an embodiment of the application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Shell; 11. Cylinder; 111. Receiving cavity; 1111. Opening; 112. Heat dissipation teeth; 12. Cover; 2. Battery assembly; 21. Heat dissipation bracket; 211. Placement hole; 22. Battery; 3. First busbar; 31. First convex shell; 4. First heat dissipation plate; 41. U-shaped sealing strip; 42. First thermal pad; 5. Thermally conductive adhesive layer; 6. Second busbar; 61. Second convex shell; 7. Second heat dissipation plate; 71. Second thermal pad; 8. Battery management system unit. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The following is combined Figures 1 to 14 This describes an embodiment of the present application.

[0050] According to an embodiment of this application, a battery pack is provided, including: a housing 1, a battery assembly 2, and a busbar. The housing 1 has a receiving cavity 111.

[0051] The battery assembly 2 includes a heat dissipation bracket 21 and multiple batteries 22. Each battery 22 has electrodes at both ends, one end being a positive electrode and the other end a negative electrode. Multiple placement holes 211 are formed through the heat dissipation bracket 21. Each battery 22 is placed one-to-one within a placement hole 211, with the outer wall of the battery 22 connected to the wall of the placement hole 211, thus enabling heat transfer between the outer wall of the battery 22 and the heat dissipation bracket 21. At this time, the electrodes at both ends of the battery 22 are close to the two ends of the placement hole 211.

[0052] Busbars are provided on both sides of the battery assembly 2, so that the electrodes at both ends of each battery 22 are respectively located close to a busbar. One busbar is connected to the electrode of each battery 22 that is close to it, and the other busbar is connected to the electrode of each battery 22 that is close to it.

[0053] With this configuration, for the battery 22 whose electrodes are connected to the busbar, the heat generated at both ends can be conducted to the busbar through the electrodes at the ends. The heat generated in the middle of the battery 22 is transferred to the heat dissipation bracket 21 through the outer wall of the battery 22. This ensures that both ends and the middle of the battery 22 can be effectively dissipated, avoiding heat accumulation in the middle of the battery 22 due to insufficient heat dissipation, which would affect performance. The battery 22 also has better temperature uniformity.

[0054] The heat dissipation bracket 21 can be made of a phase change material, which is a substance that can undergo a phase change within a specific temperature range, absorbing or releasing a large amount of latent heat. An electrical isolation plate should be installed between the busbar and the heat dissipation bracket 21.

[0055] If the busbar can be connected to the electrodes of all the batteries 22, then the batteries 22 are connected in parallel.

[0056] As an optional embodiment, the battery pack further includes a first heat sink 4 and a first thermal pad 42. For the busbars located on both sides of the battery assembly 2, each busbar has one side connected to an electrode of the battery 22, and the side facing away from the electrode is attached to the first thermal pad 42. For each first thermal pad, the side facing away from the busbar is attached to the first heat sink 4.

[0057] In this way, the heat generated at both ends of the battery 22 is transferred to the busbar through the end electrodes, and then to the first heat sink 4 through the first thermal pad 42. This prevents heat from accumulating on the first busbar 3 for a long time, which would affect the working performance of the first busbar 3 and thus the normal operation of the battery pack. At the same time, dissipating the heat on the first busbar 3 as quickly as possible also helps to dissipate heat at the ends of the battery 22.

[0058] The first heat sink 4 can be an aluminum plate, and the first thermal pad 42 can be a silicone pad.

[0059] As an optional embodiment, the battery pack further includes a thermally conductive adhesive layer 5, through which the first heat sink 4 is connected to the inner wall of the receiving cavity 111. In this way, after heat is conducted to the first heat sink 4, it is transferred through the thermally conductive adhesive layer 5 to the inner wall of the receiving cavity 111, and then to the housing 1, from where it is dissipated to the outside. This prevents a large amount of heat from the first heat sink 4 from dissipating into the housing 1, which could lead to a high internal temperature and affect the performance of the battery 22.

[0060] Specifically, after the battery 22 body is placed in the receiving cavity 111, a gap is formed between the first heat sink 4 and the inner wall of the receiving cavity 111 for placing the thermally conductive adhesive layer 5. Thermally conductive adhesive is poured into the gap between the first heat sink 4 and the inner wall of the receiving cavity 111, and after the adhesive solidifies, the thermally conductive adhesive layer 5 is formed. At this time, the side of the first heat sink 4 facing away from the first busbar 3 is bonded to the first side of the thermally conductive adhesive layer 5, and the inner wall of the receiving cavity 111 is bonded to the second side of the thermally conductive adhesive layer 5. Thus, the first heat sink is bonded to the first heat sink 4 through the thermally conductive adhesive layer 5, and the heat on the first heat sink 4 can be conducted to the housing 1 through the thermally conductive adhesive layer 5.

[0061] In a further embodiment, a U-shaped sealing strip 41 is attached to the first heat sink 4, the U-shaped sealing strip having a first side and a second side that are opposite to each other.

[0062] After the battery 22 body is placed in the receiving cavity 111, the first side of the U-shaped sealing strip 41 is attached to the inner wall of the receiving cavity 111. The second side of the U-shaped sealing strip 41 is attached to the side of the first heat sink 4 facing away from the first thermal pad 42. This forms an open-top potting groove by the inner wall of the receiving cavity 111, the U-shaped sealing strip 41, and the first heat sink 4. Thermally conductive adhesive is then poured into the potting groove, and after the thermally conductive adhesive solidifies, a thermally conductive adhesive layer 5 is formed.

[0063] The thermally conductive adhesive layer 5 formed at this time is located in the potting groove. The side of the thermally conductive adhesive layer 5 near the first heat sink 4 is in contact with the first heat sink 4, and the side of the thermally conductive adhesive layer 5 near the inner wall of the receiving cavity 111 is in contact with the inner wall of the receiving cavity 111. This allows the heat on the first heat sink 4 to be transferred to the inner wall of the receiving cavity 111 through the thermally conductive adhesive layer 5, and thus conducted to the housing 1.

[0064] This design not only makes glue application more convenient, but also reduces the amount of glue required by the U-shaped sealing strip 41, thus improving efficiency and reducing manufacturing costs.

[0065] The U-shaped sealing strip 41 includes a first sealing strip, a second sealing strip, and a third sealing strip. The first and second sealing strips are respectively attached to the left and right sides of the first heat sink 4 away from the busbar. The third sealing strip is attached to the bottom side of the first heat sink 4 away from the busbar, and the first and second sealing strips are respectively connected to the sidewalls at both ends of the third sealing strip. Thus, the first, second, and third sealing strips are sequentially connected to form the U-shaped sealing strip 41, and an adhesive filling groove is formed inside the first, second, and third sealing strips.

[0066] As an optional embodiment, the battery pack further includes a second heat sink 7 and a second thermal pad 71. At least two heat sink brackets 21 are provided along the extending direction of the placement hole 211, with adjacent heat sink brackets 21 spaced apart. A battery 22 is disposed within the placement hole 211 of each heat sink bracket 21. Busbars are provided on both sides of each heat sink bracket 21.

[0067] Therefore, for two adjacent heat dissipation brackets 21, two busbars are provided between them. And a second heat dissipation plate 7 is provided between the two busbars of two adjacent heat dissipation brackets 21.

[0068] The second heat sink 7 has a second thermal pad 71 attached to both sides, and the two busbars are respectively attached to the second heat sink 7 through a second thermal pad 71. Thus, the second heat sink 7 is connected between two adjacent heat sink supports, and the two busbars can conduct heat to the second heat sink 7 through a second thermal pad 71.

[0069] Thus, for the battery 22 located on the heat dissipation brackets 21 at both ends of the battery assembly 2, the heat generated at its first end is conducted to the busbar through the end electrode and then transferred to the first heat dissipation plate 4 through the first thermal pad 42, and the heat generated at its second end is conducted to the busbar through the end electrode and then transferred to the second heat dissipation plate 7 through the second thermal pad 71.

[0070] For the battery 22 located on the heat dissipation bracket 21 in the middle of the battery assembly 2, the heat generated at both ends is conducted to the busbar through the end electrodes and then transferred to the second heat dissipation plate 7 via the second thermal pad 71. This achieves effective heat dissipation when multiple battery groups 22 are installed.

[0071] The second heat sink 7 can be an aluminum plate, and the second thermal pad 71 can be a silicone pad.

[0072] As an optional embodiment, the busbar includes a first busbar 3 and a second busbar 6. That is, among all the busbars, some are first busbars 3 and others are second busbars 6. The busbars arranged on both sides of the battery assembly 2 are the first busbar 3 and the second busbar 6, respectively. The battery 22 has a first terminal and a second terminal.

[0073] For each heat sink bracket 21, a first busbar 3 is provided on one side and a second busbar 6 is provided on the other side. The first busbar 3 is connected to the first electrode of each battery 22 on the heat sink bracket 21, and the second busbar 6 is connected to the second electrode of each battery 22 on the heat sink bracket 21.

[0074] In some embodiments, a plurality of first protruding shell portions 31 are provided on the first busbar 3, wherein each first protruding shell portion 31 protrudes from the first busbar 3 toward the electrode of the battery 22. Each first protruding shell portion 31 corresponds one-to-one with an electrode at the first end of the battery. Each first protruding shell portion 31 has a first convex surface. When connecting the electrodes at the first end of each battery to the first busbar 3, the electrodes at the first end of each battery are welded one-to-one onto the first convex surface of the first protruding shell portion 31 on the first busbar 3, thereby connecting the electrodes at the first end of each battery to the first busbar 3 respectively, making installation more convenient.

[0075] Specifically, the first surface of the first busbar 3 is stamped onto the second surface to form a first convex shell 31. During installation, the first surface of the first busbar 3 is used to fit against the first thermal pad 42 or the second thermal pad 71. Since welding is performed on the inner side of the first convex shell 31, even if the solder mark protrudes to a certain height, it will remain on the inner side of the first convex shell 31 and will not protrude from the first surface of the first busbar 3, ensuring that the first surface of the first busbar 3 can fully fit against the first thermal pad 42, thereby ensuring the heat dissipation effect of the first busbar 3 to the first thermal pad 42 or the second thermal pad 71.

[0076] In other embodiments, a plurality of second protruding shell portions 51 are provided on the second busbar 6, wherein each second protruding shell portion 51 protrudes from the second busbar 6 toward the electrode of the battery 22. Each second protruding shell portion 51 corresponds one-to-one with an electrode at the second end of the battery. Each second protruding shell portion 51 has a second convex surface. When connecting the electrodes at the second end of each battery to the second busbar 6, the electrodes at the second end of each battery are welded one-to-one onto the second convex surface of the second protruding shell portion 51 on the second busbar 6, thereby connecting the electrodes at the second end of each battery to the second busbar 6 respectively, making installation more convenient.

[0077] Specifically, the first surface of the second busbar 6 is stamped onto the second surface to form a second convex shell 51. During installation, the first surface of the second busbar 6 is used to adhere to the first thermal pad 42 or the second thermal pad 71. Since welding is performed on the inner side of the second convex shell 51, even if the solder mark protrudes to a certain height, it will remain on the inner side of the second convex shell 51 and will not protrude from the first surface of the second busbar 6, ensuring that the first surface of the second busbar 6 can fully adhere to the first thermal pad 42, thereby ensuring the heat dissipation effect of the second busbar 6 to the first thermal pad 42 or the second thermal pad 71.

[0078] It is worth noting that, given that the first convex shell 31 is provided on the first busbar 3, the second convex shell 51 can also be provided on the second busbar 6.

[0079] In some embodiments, a plurality of second protrusions 61 are provided on the second busbar 6. When connecting the electrode of the battery 22 to the second busbar 6, the outer side of the second protrusion 61 is brought into contact with the electrode of the battery 22, and then welded to the inner side of the second protrusion 61, thereby welding the electrode of the battery 22 to the second protrusion 61 and realizing the connection between the electrode of the battery 22 and the second busbar 6, making the connection more convenient.

[0080] Specifically, the first surface of the second busbar 6 is stamped onto the second surface to form a second convex shell 61. During installation, the first surface of the second busbar 6 is used to adhere to the second thermal pad 71. Since welding is performed on the inner side of the second convex shell 61, even if the solder joint protrudes to a certain height, it will remain on the inner side of the second convex shell 61 and will not protrude from the first surface of the second busbar 6, ensuring that the first surface of the second busbar 6 can fully adhere to the second thermal pad 71, thereby ensuring the heat dissipation effect of the second busbar 6 to the second thermal pad 71.

[0081] As an optional embodiment, the housing 1 includes a cylindrical body 11 and a cover 12. A receiving cavity 111 is formed on the cylindrical body, and the bottom of the cylindrical body 11 is closed, thus forming the receiving cavity 111 inside the cylindrical body 11. The receiving cavity 111 is provided with an opening 1111 for inserting the battery assembly 2. After the battery assembly 2 is inserted, thermally conductive adhesive is injected through the opening 1111 into the gap between the first heat sink 4 and the inner wall of the receiving cavity 111. Then, the cover 12 is connected to the cylindrical body 11, so that the cover 12 closes the opening 1111 of the receiving cavity 111. A threaded hole can be formed in the cover 12, and a through hole can be formed in the cylindrical body 11. The cover 12 is partially inserted into the opening 1111, aligning the threaded hole with the through hole. A screw is then passed through the through hole, screwed into the threaded hole, and tightened, thus fixing the cylindrical body 11 and the cover 12 together with screws.

[0082] In some embodiments, heat dissipation teeth 112 are provided on the outer wall of the cylinder 11. This increases the contact area between the outer wall of the cylinder 11 and the air, thereby accelerating the rate at which the cylinder 11 dissipates heat to the outside air and preventing the cylinder 11 from accumulating heat too slowly.

[0083] In some embodiments, the battery pack further includes a battery management system unit 8. The battery management system unit 8 is connected to the cover 12, wherein each busbar is connected to the battery management system unit 8.

[0084] The Battery Management System Unit (BMS) is a key technological component of the energy storage system. It is responsible for monitoring and managing the energy storage unit 22, ensuring the safe and efficient operation of battery 22 during charging and discharging.

[0085] The battery management system unit 8 can be installed inside the cover 12.

[0086] Although embodiments of this application 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 this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery pack, characterized in that, include: The housing (1) is provided with a receiving cavity (111); A battery assembly (2) is disposed in the receiving cavity (111). The battery assembly (2) includes a heat dissipation bracket (21) and a plurality of batteries (22). The heat dissipation bracket (21) is provided with a plurality of placement holes (211). Each battery (22) is disposed in the placement hole (211) in a corresponding manner. The outer wall of the battery (22) is connected to the hole wall of the placement hole (211). Busbars are provided on both sides of the battery assembly (2), and the battery (22) has electrodes at both ends. The electrodes are connected to the busbars adjacent to them so that the electrodes of the battery (22) can conduct heat to the busbars.

2. The battery pack according to claim 1, characterized in that, Also includes: A first thermal pad (42) is attached to the side of the busbar facing away from the electrode; The first heat sink (4) is attached to the side of the first heat-conducting pad (42) facing away from the busbar.

3. The battery pack according to claim 2, characterized in that, Also includes: Thermally conductive adhesive layer (5), the first heat sink (4) is connected to the inner wall of the receiving cavity (111) through the thermally conductive adhesive layer (5).

4. The battery pack according to claim 3, characterized in that, Also includes: The U-shaped sealing strip (41) has a first side and a second side that are opposite to each other. The first side of the U-shaped sealing strip (41) is in contact with the inner wall of the receiving cavity (111), and the second side of the U-shaped sealing strip (41) is in contact with the first heat sink (4). The inner wall of the receiving cavity (111), the U-shaped sealing strip (41), and the first heat sink (4) together form a top-open potting groove. The thermally conductive adhesive layer (5) is disposed in the potting groove and is attached to the inner wall of the first heat sink and the receiving cavity (111), respectively.

5. The battery pack according to claim 1, characterized in that, At least two heat dissipation brackets (21) are provided, and each heat dissipation bracket (21) is arranged sequentially at intervals along the extension direction of the placement hole (211). There are two busbars between two adjacent heat dissipation brackets (21). The battery pack also includes: The second heat sink (7) is connected between the two busbars between two adjacent heat sink brackets (21); The second thermal pad (71) is connected between the busbar and the second heat sink (7).

6. The battery pack according to claim 1, characterized in that, The battery has a first end and a second end. The busbars arranged on both sides of the battery assembly (2) are a first busbar (3) and a second busbar (6), respectively. The first busbar (3) is arranged on one side of the heat dissipation bracket (21), and the second busbar (6) is arranged on the other side of the heat dissipation bracket (21). The first busbar (3) is connected to the electrode at the first end of the battery (22), and the second busbar (6) is connected to the electrode at the second end of the battery (22).

7. The battery pack according to claim 6, characterized in that, The first busbar (3) has a plurality of first convex shells (31) protruding in the direction close to the battery (22). The first convex shells (31) have a first convex surface, and the first convex surface is welded to the electrode at the first end of the battery (22). And / or, the second busbar (6) has a plurality of second convex shells (61) protruding in the direction close to the battery (22), the second convex shells (61) having a second convex surface, the second convex surface being welded to the electrode at the second end of the battery (22).

8. The battery pack according to claim 1, characterized in that, The housing (1) includes: The cylindrical body (11) is provided with the receiving cavity (111), and the cylindrical body (11) has an opening (1111) that communicates with the receiving cavity; The cover (12) is connected to the cylinder (11) and seals the opening (1111).

9. The battery pack according to claim 8, characterized in that, The outer wall of the cylinder (11) is provided with heat dissipation teeth (112).

10. The battery pack according to claim 8, characterized in that, Also includes: The battery management system unit (8) is connected to the cover (12), and each of the busbars is connected to the battery management system unit (8).

Images