Battery and manufacturing method thereof

Abstract

The invention provides a battery and a manufacturing method thereof, the battery comprises: a battery cell, two opposite ends of which are respectively provided with a first pole and a second pole; the chips comprise a first chip and a second chip; the box body comprises a shell and a first box cover, the shell comprises a barrel and a partition plate which are fixedly arranged, the partition plate is located in the barrel, a first cavity with an opening in one end is defined by the partition plate and the barrel, the battery cell is arranged in the first cavity, and one end of the battery cell abuts against the partition plate; the first box cover is arranged at one end of the shell to seal the first cavity; wherein a supporting part is arranged on one surface, facing the battery cell, of the first box cover, the first sheet is connected with the first pole, and the supporting part is propped against the first sheet; a pole hole is formed in the partition plate, the second bar is located on the side, away from the battery cell, of the partition plate, and the second pole penetrates through the pole hole and is connected with the second bar. Supporting force can be provided for the battery cell through the partition plate and the first box cover, so that connection between the first pole and the first bar and connection between the second pole and the second bar are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and a manufacturing method thereof. Background Art

[0002] Low-voltage (e.g. 12V) battery packs are often simple and highly integrated in design due to cost considerations, space limitations, and less demanding usage scenarios than power batteries. However, it is difficult to apply two-way cells (e.g. large cylindrical two-way cells) with poles and explosion-proof valves at both ends to low-voltage battery packs, especially the difficulty of welding the cells to the integrated busbar (Cells Contact System, CCS for short, composed of flexible circuit boards, plastic structural parts, copper and aluminum busbars, etc.) after they are placed in the battery box. Summary of the invention

[0003] The embodiments of the present invention provide a battery and a method for manufacturing the same, which can improve the technical problem of the difficulty in welding a dual-pass battery cell when it is applied to a battery pack.

[0004] In a first aspect, an embodiment of the present invention provides a battery, comprising:

[0005] A battery cell, wherein a first pole and a second pole are respectively disposed at opposite ends of the battery cell;

[0006] The bar piece includes a first bar piece and a second bar piece;

[0007] A box body, comprising a shell and a first box cover, the shell comprising a fixedly arranged cylinder and a partition, the partition is located in the cylinder and defines a first cavity with one end open with the cylinder, the battery cell is arranged in the first cavity, and one end of the battery cell abuts the partition; the first box cover is arranged at one end of the shell to close the first cavity; wherein, a support portion is provided on a side of the first box cover facing the battery cell, the first bar is connected to the first pole, and the support portion abuts against the first bar; a pole hole is provided on the partition, the second bar is located on the side of the partition away from the battery cell, the second pole passes through the pole hole and is connected to the second bar.

[0008] In one embodiment, the partition and the cylinder further define a second cavity with one end open, and the second cavity is independent of the first cavity; the box body also includes a second box cover, and the second box cover is arranged at the other end of the shell to close the second cavity, and the second bar is located in the second cavity.

[0009] In one embodiment, the box body further includes a separator, the separator is filled in the first cavity, a first accommodating cavity is penetrated through the separator, and the battery cell is accommodated in the first accommodating cavity and is adapted to the first accommodating cavity.

[0010] In one embodiment, the first box cover is in a cap shape, and a second accommodating cavity communicating with the first accommodating cavity is formed on the first box cover.

[0011] In one embodiment, first explosion-proof valves are respectively provided on opposite ends of the battery cell, and the two first explosion-proof valves are respectively communicated with the second cavity and the second accommodating cavity; a first channel penetrating the separator and the partition is also provided on the box body, and the first channel is independent of the first accommodating cavity, and the second cavity and the second accommodating cavity are communicated through the first channel; a second explosion-proof valve is also provided on the box body, and the second explosion-proof valve is communicated with the second accommodating cavity.

[0012] In one embodiment, a second channel is further provided on the box body, the second channel includes a first sub-segment that passes through the side wall of the cylinder body and a second sub-segment that is provided in the partition body, the first sub-segment and the second sub-segment are connected, the second channel is independent of the first accommodating chamber and the first channel, the second sub-segment connects the second accommodating chamber with the outside world or the second sub-segment connects the second cavity with the outside world, the second explosion-proof valve is provided on the cylinder body, and the second explosion-proof valve is connected to the first sub-segment.

[0013] In one embodiment, the first bar is connected to the first pole, and the support portion abuts against the connection between the first bar and the first pole; and / or

[0014] The second bar is integrally arranged on the partition; and / or

[0015] The first bar is connected to the first pole by welding; and / or

[0016] The second bar is connected to the second pole by welding.

[0017] In one embodiment, the battery further includes a battery management system module, and the battery management system module is disposed in the second cavity and electrically connected to the battery cell.

[0018] In one embodiment, the first box cover extends into the first cavity, and a first sealant layer is provided between the first box cover and the cylinder;

[0019] The second box cover extends into the second cavity, and a second sealing rubber layer is arranged between the second box cover and the cylinder.

[0020] In one embodiment, the first box cover is in a cap shape, and a first protrusion extending toward the cylinder is protruded from an edge of the first box cover, and the cylinder, the first box cover and the first protrusion define a first receiving groove, and the first sealant layer is located in the first receiving groove;

[0021] The second box cover is in a cap shape, and a second protrusion extending toward the cylinder is protruded from an edge of the second box cover. The cylinder, the second box cover and the second protrusion define a second receiving groove, and the second sealant layer is located in the second receiving groove.

[0022] In one embodiment, the cylinder is further provided with a first limiting portion located in the second cavity, and the second box cover abuts against the first limiting portion; and / or

[0023] The edge of the first box cover abuts against the partition.

[0024] In a second aspect, an embodiment of the present invention provides a method for manufacturing a battery, comprising the following steps:

[0025] Providing a battery cell, wherein a first pole and a second pole are respectively disposed at two opposite ends of the battery cell;

[0026] A shell is provided, the shell comprising a fixedly arranged cylinder and a partition, the partition is located in the cylinder and defines a first cavity with one end open with the cylinder, a pole hole is opened on the partition, the battery cell is arranged in the first cavity, the second pole is passed through the pole hole, and one end of the battery cell abuts against the partition;

[0027] Providing a first bar piece, and connecting the first bar piece to the first pole;

[0028] A first box cover is provided, wherein a support portion is disposed on one surface of the first box cover, and the first box cover is disposed on one end of the housing to close the first cavity, and the support portion abuts against the first tab;

[0029] A second bar is provided, and the second bar is fixed to a side of the partition away from the first cavity and connected to the second pole.

[0030] In one embodiment, the partition and the cylinder further define a second cavity with an open end, the second cavity is independent of the first cavity, and the manufacturing method of the battery further includes:

[0031] Providing a second tank cover and a battery management system module;

[0032] The battery management system module is arranged in the second cavity and connected to the battery cell;

[0033] The second box cover is arranged at the other end of the shell to close the second cavity.

[0034] Beneficial effects of the embodiments of the present invention:

[0035] In an embodiment of the present invention, by abutting one end of the battery cell against the partition and abutting the support portion of the first box cover against the first tab, the first tab can be connected to the first pole first. At this time, the partition provides support force to the battery cell, so that the first tab is fitted with the first pole of the battery cell, thereby facilitating connection. Then, the second pole is connected to the second tab. At this time, the support portion of the first box cover provides support force to the battery cell, so that the second tab is fitted with the second pole of the battery cell, thereby facilitating welding. At the same time, the force on the first tab that has been welded can be reduced, thereby reducing the probability of breakage of the first tab welding point. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic diagram of an explosion of a battery provided by an embodiment of the present invention at a first viewing angle;

[0038] Figure 2 is an exploded schematic diagram of a battery provided by an embodiment of the present invention at a second viewing angle (the first sealant layer and the second sealant layer are not shown in the figure);

[0039] Figure 3 1 is a schematic diagram of the structure of a box body provided by an embodiment of the present invention (the first box cover and the second box cover are not shown in the figure).

[0040] Explanation of the reference numerals: battery cell-1; first explosion-proof valve-12; first bar piece-2; second bar piece-3; box body-4; shell-41; cylinder body-411; first limit portion-4111; partition-412; pole hole-4121; second cavity-413; first box cover-42; support portion-421; second accommodating cavity-422; first protruding portion-423; second box cover-43; second protruding portion-431; separator-44; first accommodating cavity-441; first channel-45; second channel-46; second explosion-proof valve-47; battery management system module-5; first sealing glue layer-6; second sealing glue layer-7. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0042] First, see Figure 1-3 , an embodiment of the present invention provides a battery, comprising:

[0043] A battery cell 1, wherein a first pole and a second pole are respectively disposed at opposite ends of the battery cell 1;

[0044] The bar piece includes a first bar piece 2 and a second bar piece 3;

[0045] The box body 4 includes a shell 41 and a first box cover 42. The shell 41 includes a fixedly arranged cylinder 411 and a partition 412. The partition 412 is located in the cylinder 411 and defines a first cavity with one end open with the cylinder 411. The battery cell 1 is arranged in the first cavity, and one end of the battery cell 1 abuts against the partition 412; the first box cover 42 is arranged at one end of the shell 41 to close the first cavity; wherein, a support portion 421 is provided on a side of the first box cover 42 facing the battery cell 1, the first bar 2 is connected to the first pole, and the support portion 421 abuts against the first bar 2; a pole hole 4121 is opened on the partition 412, the second bar 3 is located on the side of the partition 412 away from the battery cell 1, and the second pole passes through the pole hole 4121 and is connected to the second bar 3.

[0046] It can be understood that when the tab is welded to the pole, the tab needs to be pressed by the welding equipment to ensure that the tab fits the pole. After the battery cell 1 is placed in the first cavity, the first tab 2 can be welded to the first pole by the welding equipment. At this time, one end of the battery cell 1 located at the bottom of the cavity abuts against the partition 412, so that the partition 412 can provide support force to the battery cell 1, so that the welding equipment can press and fit the first tab 2 and the first pole, thereby facilitating the welding of the two. After the first tab 2 is connected to the first pole, the second pole is welded to the second tab 3 by the welding equipment. At this time, the support part 421 of the first box cover 42 abuts against the first tab 2, so that the support part 421 can provide support force to the battery cell 1, so that the welding equipment can press and fit the second tab 3 and the second pole, thereby facilitating the welding of the two. At the same time, at this time, because the support part 421 bears the pressing force of the welding equipment, the probability of fracture of the welding point of the first tab 2 can be reduced.

[0047] It can be understood that a pole hole 4121 is opened on the partition 412, and the second pole passes through the pole hole 4121. The second tab 3 is located on the side of the partition 412 away from the battery cell 1, so that after the battery cell 1 is placed in the first cavity, the second tab 3 and the second pole can be welded outside the first cavity, thereby facilitating the welding operation of the two. At the same time, when the battery cell 1 is abutted against the partition 412, the second pole passes through the pole hole 4121, which can make the end face of the battery cell 1 better fit with the partition 412, thereby enhancing the supporting force of the partition 412 on the battery cell 1.

[0048] As an example, the battery of the present application may include a plurality of battery cells 1, and the battery is a battery pack. The plurality of battery cells 1 may be arranged in an S shape in the first cavity, thereby reducing the size of the battery pack along the arrangement direction of the battery cells 1. The plurality of battery cells 1 may also be arranged in a straight line in the first cavity, thereby reducing the size of the battery pack perpendicular to the arrangement direction of the battery cells 1, and then the size of the battery pack may be adjusted by adjusting the arrangement of the battery pack. The partition 412 is a plate-like structure disposed in the cylinder 411, the partition 412 may be perpendicular to the axial direction of the cylinder 411, and the shape of the partition 412 may match the shape of the inner surface of the cylinder 411. One of the first pole and the second pole is a positive pole and the other is a negative pole. The cylinder 411 and the partition 412 may form a shell 41 by integral molding. The shape of the cylinder 411 may be square, circular, or other irregular shapes. The support portion 421 abuts against the first tab 2, thereby providing support force to the first tab 2, and further the support portion 421 can provide support force to the battery cell 1. The support portion 421 can be in any shape as long as it can provide support force to the first tab 2.

[0049] In one embodiment, the partition 412 and the cylinder 411 further define a second cavity 413 which is open at one end, and the second cavity 413 is independent of the first cavity; the box body 4 also includes a second box cover 43, which is arranged at the other end of the shell 41 to close the second cavity 413, and the second bar sheet 3 is located in the second cavity 413.

[0050] It can be understood that the partition 412 is located in the barrel 411, so that the space in the barrel 411 can be divided into a first cavity and a second cavity 413. The first cavity is used to accommodate the battery cell 1, and the second cavity 413 can be used to accommodate other components of the battery pack, such as the battery management system module 5. At the same time, the second bar 3 is arranged in the second cavity 413, so that the second bar 3 and the second pole can be welded through the second cavity 413. The second box cover 43 can close the second cavity 413 after the second bar 3 and the second pole are welded, so that the components in the second cavity 413 are enclosed in the second cavity 413.

[0051] In one embodiment, the box body 4 further includes a separator 44 , which is filled in the first cavity. A first accommodating cavity 441 is provided through the separator 44 , and the battery cell 1 is accommodated in the first accommodating cavity 441 and is adapted to the first accommodating cavity 441 .

[0052] It can be understood that the shape of the separator 44 can match the shape of the inner surface of the second cavity 413, so that the separator 44 can be fixed in the second cavity 413. The separator 44 and the cylinder 411 can be processed by an integrated molding method, so that the separator 44 can be more stable in the cylinder 411 and is also easy to process. The partition 412 and the partition plate 44412 can abut against each other, so that the first pole can pass through the pole hole 4121 on the partition 412, and then the first pole can be connected to the second bar 3. The partition 412, the partition plate 44412 and the cylinder 411 can be processed by an integrated molding method, so as to improve the stability of the battery pack and facilitate processing.

[0053] In one embodiment, the first box cover 42 is in a cap shape, and a second accommodating cavity 422 communicating with the first accommodating cavity 441 is formed on the first box cover 42 .

[0054] It can be understood that the first box cover 42 is in a cap shape, the cavity of the cap structure is the second accommodating cavity 422, and the support portion 421 is located in the second accommodating cavity 422. The second accommodating cavity 422 is connected to the first accommodating cavity 441, so that the support portion 421 in the second accommodating cavity 422 can provide support force when the second bar 3 is connected to the second pole.

[0055] In one embodiment, first explosion-proof valves 12 are respectively provided at the opposite ends of the battery cell 1, and the two first explosion-proof valves 12 are respectively communicated with the second cavity 413 and the second accommodating cavity 422; a first channel 45 penetrating the partition 44 and the partition 412 is also provided on the box body 4, and the first channel 45 is independent of the first accommodating cavity 441, and the second cavity 413 and the second accommodating cavity 422 are communicated through the first channel 45; a second explosion-proof valve 47 is also provided on the box body 4, and the second explosion-proof valve 47 is communicated with the second accommodating cavity 422.

[0056] It can be understood that the battery cell 1 (e.g., a large cylindrical two-way battery cell) has a first explosion-proof valve 12 at both opposite ends, and the two first explosion-proof valves 12 are respectively communicated with the second cavity 413 and the second accommodating cavity 422. When the battery cell 1 has thermal runaway, the first explosion-proof valves 12 at both ends of the battery cell 1 may exhaust gas and enter the second cavity 413 and the second accommodating cavity 422 respectively. A through hole may be provided on the partition 412, and the first explosion-proof valve 12 at one end of the battery cell 1 may be arranged in the through hole, so that the first explosion-proof valve 12 at one end of the battery cell 1 can communicate with the second cavity 413. The first channel 45 runs through the partition 44 and the partition 412, so that the second cavity 413 and the second accommodating cavity 422 can be communicated through the first channel 45. The second explosion-proof valve 47 is arranged on the box body 4, and the second explosion-proof valve 47 can be located on the first box body 4. When the battery cell 1 has a thermal runaway, the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged from the battery pack via the second cavity 413, the first channel 45, the second accommodating cavity 422 and the second explosion-proof valve 47 in sequence, and the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the outside of the battery pack via the second accommodating cavity 422 and the second explosion-proof valve 47 in sequence; the second explosion-proof valve 47 can also be located on the second box body 4. When the battery cell 1 has a thermal runaway, the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the battery pack via the second cavity 413 and the second explosion-proof valve 47 in sequence, and the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the outside of the battery pack via the second accommodating cavity 422 and the second explosion-proof valve 47 in sequence. The gas is discharged to the outside of the battery pack through the second accommodating chamber 422, the first channel 45, the second cavity 413 and the second explosion-proof valve 47; the second explosion-proof valve 47 may be located on the cylinder 411, and the first channel 45 may be arranged at the edge of the separator 44 and the partition 412, so that the shell 41 is located beside the first channel 45, and the second explosion-proof valve 47 is connected with the second cavity 413 and the second accommodating chamber 422. When the battery cell 1 has thermal runaway, the gas discharged from the first explosion-proof valve 12 in the second cavity 413 may be discharged to the battery pack through the second cavity 413, the first channel 45 and the second explosion-proof valve 47 in sequence, and the gas discharged from the first explosion-proof valve 12 in the second cavity 413 may be discharged to the outside of the battery pack through the second accommodating chamber 422, the first channel 45 and the second explosion-proof valve 47 in sequence. In this way, when the battery cell 1 has thermal runaway, the gas discharged from the first explosion-proof valve 12 at both ends thereof can be effectively discharged to the outside of the battery pack.

[0057] It can be understood that the position of the second channel 46 can be set as needed. The second channel 46 can be located in the middle of the battery pack. The extension direction of the second channel 46 can be parallel to the axial direction of the battery cell 1, thereby increasing the exhaust speed and facilitating the arrangement of the battery cell 1.

[0058] In one embodiment, a second channel 46 is further provided on the box body 4, and the second channel 46 includes a first sub-section that passes through the side wall of the cylinder 411 and a second sub-section that is provided in the partition 44, the first sub-section and the second sub-section are connected, the second channel 46 is independent of the first accommodating chamber 441 and the first channel 45, the second sub-section connects the second accommodating chamber 422 with the outside world or the second sub-section connects the second cavity 413 with the outside world, and the second explosion-proof valve 47 is arranged on the cylinder 411, and the second explosion-proof valve 47 is connected to the first sub-section.

[0059] It can be understood that the second explosion-proof valve 47 is arranged on the cylinder 411 and is connected to the first subsection, and the second explosion-proof valve 47 can be arranged in the first subsection. The second accommodating chamber 422 is connected with the outside world through the second sub-segment. When thermal runaway occurs in the battery cell 1, the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the battery pack via the second cavity 413, the first channel 45, the second accommodating chamber 422, the second sub-segment and the second explosion-proof valve 47 in sequence, and the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the outside of the battery pack via the second accommodating chamber 422, the second sub-segment and the second explosion-proof valve 47 in sequence; the second cavity 413 is connected with the outside world through the second sub-segment. When thermal runaway occurs in the battery cell 1, the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the battery pack via the second cavity 413, the second sub-segment and the second explosion-proof valve 47 in sequence, and the gas discharged from the first explosion-proof valve 12 in the second cavity 413 can be discharged to the outside of the battery pack via the second accommodating chamber 422, the first channel 45, the second cavity 413, the second sub-segment and the second explosion-proof valve 47 in sequence. In this way, the second explosion-proof valve 47 can be located on the cylinder 411, and the first channel 45 can also be located in the middle of the battery pack. The second subsection connects the second accommodating cavity 422 with the outside world to reduce the impact of the gas discharged from the first explosion-proof valve 12 on the components in the first cavity.

[0060] In one embodiment, the first bar 2 is connected to the first pole, and the support portion 421 abuts against the connection between the first bar 2 and the first pole.

[0061] It can be understood that the first bar 2 and the first pole can be connected by welding, and the support part 421 is abutted against the connection between the two, which can provide support force for the connection and reduce the probability of fracture caused by force at the connection. The welding point between the first bar 2 and the first pole is mostly circular, and the shape of the support part 421 can be cylindrical to match the welding point.

[0062] In one embodiment, the second bar sheet 3 is integrally disposed on the partition plate 412 .

[0063] It can be understood that the second bar piece 3 can be fixed to the partition 412 by hot riveting, so as to facilitate the welding of the second bar piece 3 and the second pole.

[0064] In one embodiment, the first bar 2 is connected to the first pole by welding.

[0065] In one embodiment, the second bar 3 is connected to the second pole by welding.

[0066] In one embodiment, the battery further includes a battery management system module 5 , which is disposed in the second cavity 413 and electrically connected to the battery cell 1 .

[0067] It can be understood that the battery management system module 5 includes a BMS battery management system, which mainly manages and maintains each battery cell 1 intelligently, prevents the battery cell 1 from being overcharged and over-discharged, prolongs the service life of the battery cell 1, and monitors the status of the battery cell 1. The battery management system module 5 includes a control module, a collection harness for collecting data of the battery cell 1, an NTC thermistor, and a connector for connecting the collection harness with the control module, etc. The battery management system module 5 is arranged in the second cavity 413, so that the battery management system module 5 can be isolated from the battery cell 1, thereby facilitating the installation of the battery cell 1. The collection harness, the NTC thermistor, and the connector for connecting the collection harness with the control module can be integrated on the partition 412, thereby reducing the number of fixed brackets, the use of materials, and the steps of battery assembly.

[0068] In one embodiment, the first box cover 42 extends into the first cavity, and a first sealant layer 6 is disposed between the first box cover 42 and the cylinder 411 .

[0069] It can be understood that there is a first sealant layer 6 between the first box cover 42 and the cylinder 411, so that the first box cover 42 and the cylinder 411 can be sealed.

[0070] The second box cover 43 extends into the second cavity 413 , and a second sealing adhesive layer 7 is disposed between the second box cover 43 and the cylinder 411 .

[0071] It can be understood that the second sealing adhesive layer 7 is provided between the second box cover 43 and the cylinder 411 so as to achieve sealing between the second box cover 43 and the cylinder 411 .

[0072] In one embodiment, the first box cover 42 is in a cap shape, and a first protrusion 423 extending toward the cylinder 411 is protruded from the edge of the first box cover 42. The cylinder 411, the first box cover 42 and the first protrusion 423 define a first receiving groove, and the first sealant layer 6 is located in the first receiving groove.

[0073] It can be understood that a first protrusion 423 extending toward the cylinder 411 is protruded from the edge of the cap-shaped first box cover 42. After the first box cover 42 extends into the cylinder 411, a first receiving groove is formed between the first protrusion 423 and the cylinder 411, which can be used to receive the first sealant layer 6, thereby reducing the probability of the sealant leaking from the edge of the first box cover 42 and the cylinder 411 into the cylinder 411, so that the sealant can fill the first receiving groove, thereby improving the sealing between the first box cover 42 and the cylinder 411. The first protrusion 423 can be loosely matched with the cylinder 411 on one side facing the cylinder 411.

[0074] The second box cover 43 is in a cap shape, and a second protrusion 431 extending toward the cylinder 411 is protruded from the edge of the second box cover 43. The cylinder 411, the second box cover 43 and the second protrusion 431 define a second receiving groove, and the second sealant layer 7 is located in the second receiving groove.

[0075] It can be understood that the second protrusion 431 extending toward the cylinder 411 is protruded from the edge of the cap-shaped second box cover 43. After the second box cover 43 extends into the cylinder 411, a first receiving groove is formed between the second protrusion 431 and the cylinder 411, which can be used to receive the second sealant layer 7, thereby reducing the probability of the sealant leaking from the edge of the second box cover 43 and the cylinder 411 into the cylinder 411, so that the sealant can fill the second receiving groove, thereby improving the sealing between the second box cover 43 and the cylinder 411. The second protrusion 431 can be loosely matched with the cylinder 411 on the side facing the cylinder 411.

[0076] In one embodiment, a first limiting portion 4111 located in the second cavity 413 is further provided on the cylinder 411 , and the second box cover 43 abuts against the first limiting portion 4111 .

[0077] It can be understood that by providing the first limiting portion 4111 in the second cavity 413 and making the first limiting portion 4111 abut against the second box cover 43, the position of the second box cover 43 can be limited when the second box cover 43 is placed in the second cavity 413, thereby preventing the second box cover 43 from squeezing the components in the second cavity 413 and facilitating the installation of the second box cover 43. The first limiting portion 4111 can be provided at the edge of the second cavity 413, so as to abut against the second protrusion 431 of the second box cover 43. The number of the first limiting portions 4111 can be multiple, and they can be equally spaced around the second cavity 413, so as to better limit the depth of the second box cover 43 extending into the second cavity 413.

[0078] In one embodiment, an edge of the first tank cover 42 abuts against the partition 44 .

[0079] It can be understood that by making the edge of the first box cover 42 abut against the partition 44, the position of the first box cover 42 can be limited when the first box cover 42 is placed in the cylinder 411, thereby facilitating the installation of the first box cover 42. The first box cover 42 is in a cap shape, and its edge is convexly provided with a second protrusion 431 extending toward the cylinder 411, so that the second protrusion 431 can be abutted against the partition 44, thereby better limiting the depth of the second box cover 43 extending into the second cavity 413.

[0080] In a second aspect, an embodiment of the present invention provides a method for manufacturing a battery, comprising the following steps:

[0081] A battery cell 1 is provided, wherein a first pole and a second pole are respectively disposed at two opposite ends of the battery cell 1;

[0082] A shell 41 is provided, the shell 41 includes a fixedly arranged barrel 411 and a partition 412, the partition 412 is located in the barrel 411 and defines a first cavity with one end open with the barrel 411, a pole hole 4121 is opened on the partition 412, a battery cell 1 is arranged in the first cavity, and a second pole is passed through the pole hole 4121, and one end of the battery cell 1 abuts against the partition 412;

[0083] Providing a first bar piece 2, and connecting the first bar piece 2 to a first pole;

[0084] A first box cover 42 is provided, and a support portion 421 is provided on one surface of the first box cover 42. The first box cover 42 is provided at one end of the housing 41 to close the first cavity, and the support portion 421 abuts against the first bar sheet 2;

[0085] A second bar sheet 3 is provided, fixed to a side of the partition 412 away from the first cavity and connected to the second pole.

[0086] It can be understood that when the battery is manufactured, the battery cell 1 is first placed in the first cavity. When a separator 44 is provided in the first cavity, the battery cell 1 is placed in the first accommodating cavity 441 in the separator 44, and the second pole is passed through the pole hole 4121 on the partition 412. The end of the battery cell 1 close to the partition 412 abuts against the partition 412. At this time, the first bar piece 2 and the first pole are welded by a welding device, and the partition 412 bears the pressure of the welding device. Next, the first box cover 42 is placed in the cylinder 411 and connected by a sealant. At this time, the support part 421 on the first box cover 42 abuts against the first bar piece 2. Next, the second bar piece 3 and the second pole are welded by a welding device, and the first box cover 42 bears the pressure of the welding device. In order to make the battery cell 1 more stably fixed in the first accommodating cavity 441, a structural adhesive can be set in the battery cell 1 and the first accommodating cavity 441 after the battery cell 1 is placed in the box.

[0087] In one embodiment, the partition 412 and the cylinder 411 further define a second cavity 413 with an open end, and the second cavity 413 is independent of the first cavity. The manufacturing method of the battery further includes:

[0088] Providing a second tank cover 43 and a battery management system module 5;

[0089] The battery management system module 5 is disposed in the second cavity 413 and connected to the battery cell 1;

[0090] The second box cover 43 is disposed at the other end of the housing 41 to close the second cavity 413 .

[0091] It can be understood that the battery management system module 5 includes a control module, a collection harness for collecting data of the battery cell 1, an NTC thermistor, and a connector for connecting the collection harness and the control module, etc. The collection harness for collecting data of the battery cell 1, the NTC thermistor, and the connector for connecting the collection harness and the control module can be integrated on the partition 412 before the battery cell 1 is placed in the box 4, or can be integrated on the partition 412 after the second bar piece 3 is connected to the second pole. The control module can be placed in the second cavity 413 after the second bar piece 3 is connected to the second pole, so as to facilitate the connection between the second bar piece 3 and the second pole. Finally, the second box cover 43 is connected to the shell 41 to achieve sealing inside the box 4.

[0092] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery, characterized in that: include: A battery cell, wherein a first pole and a second pole are respectively disposed at opposite ends of the battery cell; The bar piece includes a first bar piece and a second bar piece; A box body, comprising a shell and a first box cover, the shell comprising a fixedly arranged cylinder and a partition, the partition is located in the cylinder and defines a first cavity with one end open with the cylinder, the battery cell is arranged in the first cavity, and one end of the battery cell abuts the partition; the first box cover is arranged at one end of the shell to close the first cavity; wherein, a support portion is provided on a side of the first box cover facing the battery cell, the first bar is connected to the first pole, and the support portion abuts against the first bar; a pole hole is provided on the partition, the second bar is located on the side of the partition away from the battery cell, the second pole passes through the pole hole and is connected to the second bar.

2. The battery according to claim 1, characterized in that The partition and the cylinder also define a second cavity with an open end, and the second cavity is independent of the first cavity; the box body also includes a second box cover, which is arranged at the other end of the shell to close the second cavity, and the second bar is located in the second cavity.

3. The battery according to claim 2, characterized in that The box body further comprises a separator, wherein the separator is filled in the first cavity, a first accommodating cavity is provided through the separator, and the battery cell is accommodated in the first accommodating cavity and is adapted to the first accommodating cavity.

4. The battery according to claim 3, characterized in that The first box cover is in a cap shape, and a second accommodating cavity communicating with the first accommodating cavity is formed on the first box cover.

5. The battery according to claim 4, characterized in that A first explosion-proof valve is also provided on the opposite ends of the battery cell, and the two first explosion-proof valves are respectively communicated with the second cavity and the second accommodating cavity; a first channel that runs through the separator and the partition is also provided on the box body, and the first channel is independent of the first accommodating cavity, and the second cavity and the second accommodating cavity are communicated through the first channel; a second explosion-proof valve is also provided on the box body, and the second explosion-proof valve is communicated with the second accommodating cavity.

6. The battery according to claim 5, characterized in that A second channel is also provided on the box body, and the second channel includes a first sub-segment penetrating the side wall of the cylinder body and a second sub-segment provided in the partition body, the first sub-segment is connected to the second sub-segment, the second channel is independent of the first accommodating chamber and the first channel, the second sub-segment connects the second accommodating chamber with the outside world or the second sub-segment connects the second cavity with the outside world, the second explosion-proof valve is provided on the cylinder body, and the second explosion-proof valve is connected to the first sub-segment.

7. The battery according to claim 1, characterized in that The first tab is connected to the first pole, and the support portion abuts against the connection between the first tab and the first pole; and / or The second bar is integrally arranged on the partition; and / or The first bar is connected to the first pole by welding; and / or The second bar is connected to the second pole by welding.

8. The battery according to claim 2, characterized in that The battery further includes a battery management system module, which is disposed in the second cavity and electrically connected to the battery cell.

9. The battery according to claim 2, characterized in that The first box cover extends into the first cavity, and a first sealing rubber layer is provided between the first box cover and the cylinder; The second box cover extends into the second cavity, and a second sealing rubber layer is arranged between the second box cover and the cylinder.

10. The battery according to claim 9, characterized in that The first box cover is in a cap shape, and a first protrusion extending toward the cylinder is protruded from an edge of the first box cover; the cylinder, the first box cover and the first protrusion define a first receiving groove, and the first sealant layer is located in the first receiving groove; The second box cover is in a cap shape, and a second protrusion extending toward the cylinder is protruded from an edge of the second box cover. The cylinder, the second box cover and the second protrusion define a second receiving groove, and the second sealant layer is located in the second receiving groove.

11. The battery according to claim 3, characterized in that The cylinder is further provided with a first limiting portion located in the second cavity, and the second box cover abuts against the first limiting portion; and / or The edge of the first box cover abuts against the partition.

12. A method for manufacturing a battery, characterized in that: The following steps are involved: Providing a battery cell, wherein a first pole and a second pole are respectively disposed at two opposite ends of the battery cell; A shell is provided, the shell comprising a fixedly arranged cylinder and a partition, the partition is located in the cylinder and defines a first cavity with one end open with the cylinder, a pole hole is opened on the partition, the battery cell is arranged in the first cavity, the second pole is passed through the pole hole, and one end of the battery cell abuts against the partition; Providing a first bar piece, and connecting the first bar piece to the first pole; A first box cover is provided, wherein a support portion is disposed on one surface of the first box cover, and the first box cover is disposed on one end of the housing to close the first cavity, and the support portion abuts against the first tab; A second bar is provided, and the second bar is fixed to a side of the partition away from the first cavity and connected to the second pole.

13. The method for manufacturing a battery according to claim 12, characterized in that: The partition and the cylinder further define a second cavity with an open end, the second cavity being independent of the first cavity, and the manufacturing method of the battery further includes: Providing a second tank cover and a battery management system module; The battery management system module is arranged in the second cavity and connected to the battery cell; The second box cover is arranged at the other end of the shell to close the second cavity.

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