CN107959046A - A kind of power battery - Google Patents

Abstract

The present invention provides a kind of power battery, including the first cover board and the second cover board, the housing between the first cover board and the second cover board, the multiple battery cores being contained in housing, the first drainage component between the first cover board and multiple battery cores and the second drainage component between the second cover board and multiple battery cores that parallel interval is oppositely arranged；Housing includes bottom plate, the first side plate extended to form from bottom plate to the first cover board direction and the second side plate extended to form from bottom plate to the second cover board direction；Bottom plate offers multiple location holes for being used to position battery core, and each battery core runs through a corresponding location hole and one end is electrically connected to the first drainage component, the other end is electrically connected to the second drainage component；Each battery core is cased with a hollow out protection cylinder close to one end of the first drainage component, and the one side that each hollow out protection cylinder is resisted against the first drainage component is equipped with conductive sheet.

Description

a power battery

【Technical field】

The invention relates to the technical field of batteries, in particular to a power battery.

【Background technique】

Lithium-ion power batteries have been widely used because of their ability to store energy, high energy density, fast charge and discharge, long cycle life, and environmental friendliness. After years of development, the production process of lithium-ion power batteries and the selection of positive and negative electrode materials have been greatly improved. However, the energy stored in a single battery is limited. When assembling multiple single batteries in series and parallel, not only the process It is cumbersome, complex in structure, and has high requirements for the consistency of single cells. A large number of connecting parts required for series and parallel connections will occupy a large space, and welding of multiple interfaces will also lead to increased internal resistance and increased energy loss. In addition, in order to ensure safety, the battery management system needs to monitor the temperature and voltage of each single battery, which further complicates the structure and increases the cost.

In view of this, it is necessary to provide a power battery to overcome the above defects.

【Content of invention】

The purpose of the present invention is to provide a power battery with increased capacity, reduced internal resistance and simple structure.

In order to achieve the above object, the present invention provides a power battery, which includes a first cover plate and a second cover plate arranged in parallel and spaced opposite each other, a housing located between the first cover plate and the second cover plate, a housing A plurality of electric cores in the housing, a first drainage assembly located between the first cover plate and the plurality of electric cores, and a drain assembly located between the second cover plate and the plurality of electric cores The second drainage assembly; the housing includes a bottom plate arranged parallel to the first cover plate and the second cover plate, a first side plate extending from the bottom plate to the direction of the first cover plate, and The bottom plate extends toward the second cover plate to form a second side plate, and the first cover plate is sealed with the first side plate, and the second cover plate is sealed with the second side plate Cooperate; the bottom plate is provided with a plurality of positioning holes that pass through the bottom plate and are used to position the battery cells. Connected to the second drainage component; one end of each battery core close to the first drainage component is covered with a hollow protection tube, and each hollow protection tube is provided with a conductive sheet against the side of the first drainage component , each cell is electrically connected to the first current drainage assembly through a corresponding conductive sheet.

In a preferred embodiment, each electric core is cylindrical and is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet; a negative pole, the negative pole is electrically connected to the negative pole of each cell through the first drainage assembly and the corresponding conductive sheet; the second cover is provided with a positive pole, and the positive pole The column is electrically connected to the positive electrode piece of each cell through the second drainage assembly.

In a preferred embodiment, it further includes a limiting plate accommodated in the housing and arranged in parallel with the bottom plate at intervals and between the bottom plate and the second cover plate, the limiting plate is provided with multiple Two limit holes that pass through the limit plate and correspond to the positioning holes one by one; the end of each cell away from the hollow protection tube passes through the corresponding limit hole and makes the limit plate abut against The hollow protection cylinder.

In a preferred embodiment, the hollow protection cylinder is in the shape of a cylinder with one end closed and the inner diameter corresponds to the diameter of the battery core, the conductive sheet is arranged at the closed end of the hollow protection cylinder; the positioning hole is circular And the diameter corresponds to the outer diameter of the hollow protection cylinder; the limiting hole is circular and the diameter corresponds to the inner diameter of the hollow protection cylinder.

In a preferred embodiment, the limiting plate is also provided with a plurality of through holes passing through the limiting plate and used for electrolyte circulation.

In a preferred embodiment, the first drainage assembly includes a first bus sheet and a first lead-out sheet, and the first bus sheet includes an annular first bus section and a ring extending from one end of the first bus section. The first connection part formed by the first lead-out piece includes the first lead-out part and the second connection part extending from the first lead-out part; the first bus part is electrically connected to the negative electrode piece of each cell The first connection part is electrically connected to the second connection part, and the first lead-out part is electrically connected to the negative pole.

In a preferred embodiment, the second drainage assembly includes a second bus piece and a second lead-out piece, and the second bus piece includes an annular second bus section and a ring extending from one end of the second bus section. The second lead-out piece includes a second lead-out part and a fourth connection part extending from the second lead-out part; the second bus part is electrically connected to the positive electrode piece of each cell The third connecting portion is electrically connected to the fourth connecting portion, and the second lead-out portion is electrically connected to the positive pole.

In a preferred embodiment, the second cover plate is also provided with a liquid injection hole for filling the electrolyte.

In a preferred embodiment, an explosion-proof valve is also provided on the second cover.

The power battery provided by the present invention adopts a plurality of highly automated cylindrical cells assembled into a square battery, which improves the energy storage capacity of a single battery and reduces the connection parts and occupied space required for series and parallel connections between batteries . At the same time, the number of batteries to be monitored by the battery management system is reduced, and the overall internal resistance is also reduced, which improves the effective power of the battery.

【Description of drawings】

Fig. 1 is an exploded diagram of a power battery provided by the present invention.

FIG. 2 is a schematic structural view of the partially assembled power battery shown in FIG. 1 .

【Detailed ways】

In order to make the object, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

Please refer to FIG. 1 and FIG. 2 , the present invention provides a power battery 100, which includes a first cover plate 10 and a second cover plate 20 arranged in parallel and spaced apart from each other, and is located between the first cover plate 10 and the second cover plate. 20 between the housing 30, a plurality of batteries 40 accommodated in the housing 30, a first drainage assembly 50 located between the first cover 10 and the plurality of batteries 40, and a The second current drainage assembly 60 between the second cover plate 20 and the plurality of battery cells 40 .

Specifically, the housing 30 includes a bottom plate 31 arranged parallel to the first cover plate 10 and the second cover plate 20 , and a first The side panel 32 and the second side panel 33 extending from the bottom panel 31 toward the second cover panel 20 are formed. The first cover plate 10 is in sealing fit with the first side plate 32 , and the second cover plate 20 is in sealing fit with the second side plate 33 .

The bottom plate 31 defines a plurality of positioning holes 311 passing through the bottom plate 31 and used for positioning the battery cells 40 . Each cell 40 passes through a corresponding positioning hole 311 , and one end is electrically connected to the first drainage assembly 50 , and the other end is electrically connected to the second drainage assembly 60 .

Further, one end of each cell 40 close to the first drainage assembly 50 is covered with a hollow protection tube 70 , and each hollow protection tube 70 is provided with a conductive sheet 80 on one side against the first drainage assembly 50 , each battery cell 40 is electrically connected to the first drain assembly 50 through a corresponding conductive sheet 80 . In this embodiment, the hollow protection cylinder 70 is connected to the conductive sheet 80 by laser welding. The hollow protection cylinder 70 is made of lightweight materials with good insulation, corrosion resistance to electrolyte solution, and high temperature resistance. In addition, the hollow structure of the hollow protective tube 70 facilitates the sufficient contact between the battery cell 40 and the electrolyte.

Each cell 40 has a cylindrical shape and is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet. The first cover plate 10 is provided with a negative electrode post 11 , and the negative electrode post 11 is electrically connected to the negative electrode sheet of each battery cell 40 through the first drain assembly 50 and the corresponding conductive sheet 80 . The second cover plate 20 is provided with a positive pole 21 , and the positive pole 21 is electrically connected to the positive plate of each battery cell 40 through the second drain assembly 60 .

Further, the power battery 100 further includes a limiting plate 90 accommodated in the casing 30 and arranged parallel to the bottom plate 31 at intervals and between the bottom plate 31 and the second cover plate 20 , the limiting plate 90 The positioning plate 90 is provided with a plurality of limiting holes 91 passing through the limiting plate 90 and corresponding to the positioning holes 311 one by one. An end of each battery cell 40 away from the hollowed-out protective tube 70 passes through a corresponding limiting hole 91 and makes the limiting plate 90 abut against the hollowed-out protective tube 70 . The limiting plate 90 is also provided with a plurality of through holes 92 passing through the limiting plate 90 and used for electrolyte circulation.

In this embodiment, the hollow protection tube 70 is in the shape of a cylinder with one end closed and the inner diameter corresponds to the diameter of the battery cell 40 , and the conductive sheet 80 is disposed on the closed end of the hollow protection tube 70 . The positioning hole 311 is circular and has a diameter corresponding to the outer diameter of the hollow protection cylinder 70 . The limiting hole 91 is circular and has a diameter corresponding to the inner diameter of the hollow protection cylinder 70 .

The first drainage assembly 50 includes a first bus piece 51 and a first lead-out piece 52. The first bus piece 51 includes a ring-shaped first bus section 511 and extends from one end of the first bus section 511. The first connecting portion 512 includes a first leading portion 521 and a second connecting portion 522 extending from the first leading portion 521 . The first bus part 511 is electrically connected to the negative electrode sheet of each cell 40 through the conductive sheet 80, the first connecting part 512 is electrically connected to the second connecting part 522, and the first lead-out The portion 521 is electrically connected to the negative pole 11 . In this embodiment, the plurality of battery cells 40 are arranged in a matrix, and the first confluence portion 511 is in the shape of a rectangular ring.

The second drainage assembly 60 includes a second bus piece 61 and a second lead-out piece 62, and the second bus piece 61 includes an annular second bus section 611 and extends from one end of the second bus section 611. The second lead-out piece 62 includes a second lead-out portion 621 and a fourth connection portion 622 extending from the second lead-out portion 621 . The second bus section 611 is electrically connected to the positive electrode piece of each cell 40, the third connecting part 612 is electrically connected to the fourth connecting part 622, and the second lead-out part 621 is connected to the positive electrode. The pole 21 is electrically connected. In this embodiment, the second confluence portion 611 is in the shape of a rectangular ring, and the third connection portion 612 and the fourth connection portion 622 are both in an “L” shape.

Further, the second cover plate 20 is also provided with a liquid injection hole 22 for filling electrolyte. It can be understood that during the production process, it is necessary to inject electrolyte solution into the sealed space surrounded by the casing 30, the first cover plate 10 and the second cover plate 20, and make the plurality of battery cells 40 and Electrolyte phase contact.

Further, the second cover plate 20 is also provided with an explosion-proof valve 23 . It can be understood that the power battery 100 generates heat during charging and discharging, which causes the air pressure in the sealed space surrounded by the casing 30 , the first cover plate 10 and the second cover plate 20 to increase, An excessive pressure difference from the external atmospheric pressure may cause safety accidents such as explosion, and the explosion-proof valve 23 can release pressure when the pressure difference is too large, thereby improving safety performance.

In this embodiment, the first cover plate 10, the second cover plate 20, the housing 30 and the limiting plate 90 are all made of lightweight materials with good insulation, corrosion resistance to electrolyte, and high temperature resistance. production.

The production process of the power battery 10 provided by the present invention is simple, and the capacity can be controlled by the number of battery cells 40 in the housing 30. The core 40 is positioned and assembled to avoid vibration and movement, which improves safety. In addition, the conductive sheet 80 provided on one side of the hollow protection tube 70 can reduce the operational difficulty of spot welding the battery core 40 .

The present invention is not limited to the description in the description and the implementation, so those skilled in the art can easily realize additional advantages and modifications, so without departing from the spirit and scope of the general concept defined by the claims and equivalent scope Without limitation, the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein.

Claims (9)

1. A power battery, characterized in that: it includes a first cover plate and a second cover plate arranged in parallel and spaced opposite each other, a housing located between the first cover plate and the second cover plate, accommodated in the The plurality of battery cells in the housing, the first drainage assembly located between the first cover plate and the plurality of battery cells, and the second drain assembly located between the second cover plate and the plurality of battery cells The drainage assembly; the housing includes a bottom plate arranged parallel to the first cover plate and the second cover plate, a first side plate extending from the bottom plate to the direction of the first cover plate, and a first side plate formed from the bottom plate a second side plate formed by extending the bottom plate toward the second cover plate, and the first cover plate is in sealing fit with the first side plate, and the second cover plate is in sealing fit with the second side plate; The bottom plate is provided with a plurality of positioning holes that penetrate the bottom plate and are used for positioning the battery cells. Each battery core passes through a corresponding positioning hole and one end is electrically connected to the first drainage assembly, and the other end is electrically connected to the The second drainage component; one end of each cell close to the first drainage component is covered with a hollow protection tube, and each hollow protection tube is provided with a conductive sheet against the side of the first drainage component, each Each battery cell is electrically connected to the first current drainage assembly through a corresponding conductive sheet. 2. The power battery according to claim 1, wherein each battery cell is cylindrical and is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator between the positive electrode sheet and the negative electrode sheet; The first cover is provided with a negative pole, and the negative pole is electrically connected to the negative plate of each cell through the first drainage assembly and the corresponding conductive sheet; the second cover is provided with There is a positive pole, and the positive pole is electrically connected to the positive plate of each cell through the second drainage assembly. 3 . The power battery according to claim 2 , further comprising a limiting plate housed in the casing and spaced parallel to the bottom plate and located between the bottom plate and the second cover plate , the limiting plate is provided with a plurality of limiting holes that pass through the limiting plate and correspond to the positioning holes one by one; the end of each battery core away from the hollow protection tube passes through a corresponding limiting hole and The limiting plate is made to abut against the hollow protection cylinder. 4. The power battery according to claim 3, characterized in that: the hollow protection tube is in the shape of a cylinder with one end closed and the inner diameter corresponds to the diameter of the battery cell, and the conductive sheet is arranged on the hollow protection tube The closed end; the positioning hole is circular and its diameter corresponds to the outer diameter of the hollow protection tube; the limiting hole is circular and its diameter corresponds to the inner diameter of the hollow protection tube. 5 . The power battery according to claim 3 , wherein the limiting plate is further provided with a plurality of through holes passing through the limiting plate and used for electrolyte circulation. 6 . 6. The power battery according to claim 2, characterized in that: the first drainage assembly includes a first busbar and a first lead-out piece, and the first busbar includes an annular first busbar and a self-contained first busbar. A first connection part extended from one end of the first confluence part, the first lead-out piece includes a first lead-out part and a second connection part extended from the first lead-out part; the first confluence part It is electrically connected to the negative electrode sheet of each battery cell, the first connection part is electrically connected to the second connection part, and the first lead-out part is electrically connected to the negative pole pole. 7. The power battery according to claim 2, characterized in that: the second drainage assembly includes a second busbar and a second lead-out piece, and the second busbar includes an annular second busbar and a self-contained A third connection part extending from one end of the second confluence part, the second lead-out piece includes a second lead-out part and a fourth connection part extending from the second lead-out part; the second confluence part It is electrically connected to the positive electrode sheet of each battery cell, the third connection part is electrically connected to the fourth connection part, and the second lead-out part is electrically connected to the positive pole pole. 8. The power battery according to claim 1, characterized in that: the second cover plate is also provided with a liquid injection hole for filling electrolyte. 9. The power battery according to claim 1, wherein an explosion-proof valve is further provided on the second cover.