CN117477117A - Battery cover plate, single battery and unpacking tool - Google Patents

Abstract

The invention provides a battery cover plate, a single battery and a unpacking tool, which mainly solve the problems that the assembly efficiency of the large-capacity battery is low and the yield is low because the single battery needs to be unpacked twice in the existing large-capacity battery assembly process. The battery cover plate comprises a cover plate body and a bag opening device, wherein the cover plate body is provided with a weak area, the bag opening device is fixed on the weak area of the cover plate body, and the bag opening device and the weak area are separated from the cover plate body under the action of external force so that the battery cover plate forms an opening. When the large-capacity battery is formed by the battery cover plates of the battery, the battery cover plates only need to open the battery once, and compared with a two-time opening mode, the opening times are reduced, so that the influence of external air on the battery is avoided due to the first opening misoperation, the yield of the large-capacity battery is improved, and meanwhile, the assembly efficiency of the large-capacity battery is also improved due to the one-time opening mode.

Description

Battery cover plate, single battery and unpacking tool

Technical Field

The invention relates to the field of batteries, in particular to a battery cover plate, a single battery and a unpacking tool.

Background

With the further development of lithium ion batteries in recent years, the application scenes of lithium ion batteries are more and more extensive, and particularly, the application scenes with larger requirements on the battery capacity are more and more. For example: the power battery of the automobile, the energy storage battery forming the household light storage integrated machine, the battery forming the energy storage system for the power plant and the like.

In the above usage scenario, in order to meet the requirement of larger capacity, conventionally, a plurality of single batteries are connected together in a serial-parallel connection manner to form a large-capacity battery. However, due to the difference of the single batteries in the large-capacity battery, the uniformity of the single batteries in the large-capacity battery is poor, and the capacity and the cycle life of the large-capacity battery are limited.

In order to solve the problems, the existing high-capacity battery is communicated with the electrolyte area and the gas area of each single battery, so that each single battery is under the unified shared electrolyte and gas system, the difference among the single batteries is reduced to a certain extent, and the cycle life of the high-capacity battery is prolonged.

In the manufacturing process of the high-capacity battery, first, a primary opening is formed in the battery shell of each single battery, and then a sealing mechanism is mounted on the primary opening, and the sealing mechanism has the main function of sealing the single battery and protecting electrolyte in the single battery from being contacted with air. When each single battery is assembled to form a large-capacity battery, the sealing mechanism is separated from the single battery, a secondary opening is formed in the battery shell, and finally, the inner cavities of the single batteries are communicated through the secondary opening. The mounting mode of the sealing mechanism needs to carry out secondary unpacking on the single battery, so that the manufacturing process of the high-capacity battery is complex, the assembly efficiency is low, the risk of pollution of electrolyte in the single battery is increased in the secondary unpacking process, and the yield of the high-capacity battery is further affected.

Disclosure of Invention

In order to solve the problems that the assembly efficiency of the large-capacity battery is low and the yield is low due to the fact that the single battery needs to be unpacked twice in the existing large-capacity battery assembly process, the invention provides a battery cover plate, the single battery and a unpacking tool.

In order to solve the problems, the technical scheme of the invention is as follows:

the invention provides a battery cover plate which comprises a cover plate body and a bag opening device, wherein a weak area is arranged on the cover plate body, the bag opening device is fixed on the weak area of the cover plate body, and under the action of external force, the bag opening device and the weak area are separated from the cover plate body so as to enable the battery cover plate to form an opening.

Further, the package opening device comprises a traction part and a fixing part, wherein the traction part is connected with the weak area of the cover plate body through the fixing part.

Further, the number of the traction portions is two, the two traction portions and the fixing portion are integrally formed into a U-shaped structure, and the two traction portions are provided with lug hanging holes.

Further, a circle of annular grooves is formed in the cover plate body, and the area defined by the annular grooves is a weak area.

Further, the cross section of the annular groove is U-shaped or V-shaped.

Further, the weak area is in the shape of a water drop, a circle or a racetrack.

The invention also provides a single battery, which comprises a battery shell, wherein an electrode assembly is arranged in the battery shell, the battery shell comprises an upper cover plate, a lower cover plate and a cylinder body, the upper cover plate is provided with a positive pole column and a negative pole column, and at least one of the upper cover plate and the lower cover plate adopts the battery cover plate.

The invention also provides a unpacking tool which is used for separating the unpacking device from the cover plate body, and comprises a guide block, a push rod and a plurality of traction pieces; the guide block is internally provided with a first channel penetrating along the X direction and a plurality of containing grooves penetrating along the Y direction, and the containing grooves are distributed along the X direction and are communicated with the first channel; the traction piece is positioned in the accommodating groove and is respectively used for being connected with the opening device of each single battery; the pulling piece is provided with a second channel parallel to the first channel, the first channel and the second channel have height difference, and when the first channel slides to the second channel, the pushing rod moves in the containing groove along the Y direction to separate the unpacking device of each single battery from the cover plate body, so that the cover plate body forms an opening.

Further, one end of the second channel is provided with a first wedge-shaped surface, and the end part of the push rod is provided with a second wedge-shaped surface matched with the first wedge-shaped surface.

Further, both sides of the pulling piece are provided with hanging lugs which are matched with hanging lug holes in the unpacking device.

Further, the guide block is of a cylinder structure with a semicircular cross section.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

1. according to the invention, the weak area is arranged on the cover plate body, the bag opening device is connected to the weak area, and the bag opening device and the weak area are separated from the cover plate body under the action of external force, so that the battery cover plate forms an opening. When each single battery forms a large-capacity battery, the battery cover plate only needs to open the single battery once, and compared with the mode that the single battery needs to be opened twice when the prior single battery forms the large-capacity battery, the open times are reduced, so that the influence of external air on each single battery caused by the first open misoperation is avoided, the yield of the large-capacity battery is improved, and meanwhile, the assembly efficiency of the large-capacity battery is also improved by the mode of opening the single battery once.

2. In the battery cover plate, the unpacking device comprises the fixing part and the traction part, the traction part is arranged to be convenient to be matched with the unpacking tool, and the unpacking device and the weak area can be quickly and conveniently separated from the cover plate body.

3. In the battery cover plate, the fixing part and the traction part are of an integrally formed U-shaped structure, the integral forming part can improve the rigidity of the whole unpacking device, and the U-shaped structure is convenient for the unpacking device to be quickly and reliably connected with the unpacking tool, so that the whole weak area is convenient to separate from the cover plate body.

4. In the battery cover plate, the mode of forming the weak area on the cover plate body through the annular groove is convenient to process and manufacture compared with the mode of adopting different thicknesses or other modes, and the manufacturing cost is low.

5. The unpacking tool provided by the invention can reliably separate the unpacking device of each single battery from the cover plate body, and when the unpacking tool is taken out from the hollow member, the unpacking device of each single battery and the weak area are taken out along with the unpacking tool, so that the influence on the performance of the high-capacity battery caused by the fact that the unpacking device and the weak area are detained in the shared cavity after unpacking each single battery is avoided.

6. In the bag opening tool provided by the invention, the matching surface of the push rod and the pulling piece is a wedge-shaped surface, so that the operation process is smoother when the push rod pulls the pulling piece downwards during bag opening, the bag opening resistance is smaller, and the bag opening process is quicker.

7. In the unpacking tool provided by the invention, the traction piece is connected with the hanging lug hole of the unpacking device through the hanging lugs, and when the unpacking device is connected with the unpacking tool, the structure is simpler in installation process, and the unpacking device and the traction piece can be connected only by simple operation.

8. In the unpacking tool provided by the invention, the guide block is of a semicircular cylinder structure with the cross section, and the semicircular cylinder structure is convenient and quick when the unpacking tool is taken out from the shared cavity.

Drawings

Fig. 1 is a schematic structural view of a lower cover plate provided with a bag opening device in embodiment 1;

fig. 2 is a schematic structural view of the upper cover plate provided with the unpacking device in embodiment 1;

fig. 3 is a schematic structural view of a drum provided with a bag opening device in embodiment 1;

fig. 4 is a schematic diagram showing the structure of a large-capacity battery composed of single batteries in embodiment 2;

fig. 5 is a schematic diagram of a second structure of the large-capacity battery formed by the unit cells in embodiment 2;

fig. 6 is a schematic structural view of a hollow member in embodiment 2;

fig. 7 is a schematic diagram III of the structure of a large-capacity battery composed of single batteries in embodiment 2;

fig. 8 is a schematic diagram showing the structure of a large-capacity battery composed of unit cells in example 2;

fig. 9 is a schematic diagram showing the installation of the unpacking tool and the large-capacity battery in example 3;

FIG. 10 is a schematic view of the unpacking tool in example 3;

fig. 11 is a schematic diagram of the unpacking tool for unpacking each single battery in example 3.

The reference numerals are: 1-single battery, 2-hollow component, 3-unpacking device, 4-unpacking tool, 11-upper cover plate, 12-lower cover plate, 13-cylinder, 21-hollow box, 22-cover plate, 23-first through hole, 24-liquid injection port, 25-U-shaped shell, 26-first cover plate, 27-third cover plate, 28-second cover plate, 29-electrolyte sharing chamber, 210-gas sharing chamber, 211-second through hole, 31-fixed part, 32-traction part, 33-hanging ear hole, 41-guide block, 42-push rod, 43-traction part, 411-first channel, 412-containing groove, 421-second wedge surface, 431-second channel, 432-hanging ear.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

The appearances of the phrase "in other embodiments" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. In this specification, unless explicitly stated and limited otherwise, the term "coupled" is to be interpreted broadly, as for example, either fixedly coupled, detachably coupled, or integrally coupled; can be directly connected, can be indirectly connected through an intermediate piece, and can also be communicated with the inside of two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by "fixed and bottom" or the like in the terminology is based on the orientation or positional relationship shown in the accompanying drawings, and is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1

As shown in fig. 1 to 2, the present embodiment provides a battery cover plate, which includes a cover plate body provided with a weakened area and an unpacking device 3 fixed to the weakened area of the cover plate body. Under the action of external force, the opening device 3 and the weak area are integrally separated from the cover plate body, and the battery cover plate forms an opening so as to enable electrolyte and gas to pass through. The battery cover plate can be a lower cover plate 12 of the single battery 1 or an upper cover plate 11 of the single battery 1, and if the battery cover plate is the upper cover plate 11 of the single battery 1, the cover plate body is also provided with a positive pole column and a negative pole column.

The weakened area on the cover body can be achieved in various manners, for example, the wall thickness of a part of the area on the cover body is smaller than that of other areas, the area with smaller wall thickness is the weakened area, or part of the side wall of the cover body is inwards concave or outwards convex to form the weakened area.

In this embodiment, the weakened area is preferably formed in the following manner: the cover plate body is provided with a circle of annular grooves, and the area defined by the annular grooves is a weak area. The area occupied by the weak area on the cover plate body is as large as possible, so that the opening formed subsequently is large, and the electrolyte and the gas are facilitated to be communicated. Meanwhile, the weak area is shaped as easy to tear and form an opening, such as a water drop shape, a round shape or a runway shape. In addition, the weak area is located in the middle of the cover plate body as much as possible, and machining operation is facilitated. The cross section of the annular groove forming the weak area is preferably U-shaped or V-shaped, the U-shaped or V-shaped annular groove is easy to process and tear to form an opening, and the operation force during unpacking is reduced.

The effect of the opening device 3 in this embodiment is different from the effect of the sealing mechanism in the prior art, and the sealing mechanism in the prior art mainly seals the single battery and protects the electrolyte in the single battery from being contacted with air. In this embodiment, the device is mainly used for being connected with the unpacking tool so as to separate the weak area from the cover plate body. The opening device 3 may be implemented in various configurations, and the following is a preferred configuration of the present embodiment.

As shown in fig. 1 and 2, the unpacking device 3 includes a traction portion 32, and the traction portion 32 is mainly used for being connected with the unpacking tool to transmit the acting force of the unpacking tool to the weak area so as to separate the weak area from the cover plate body. In this embodiment, in order to facilitate and reliably separate the weakened area from the cover body, the traction portion 32 is connected to the weakened area of the cover body through the fixing portion 31. The fixing portion 31 may be a sheet structure, and may be a PP plastic sheet, a PE plastic sheet, or an aluminum sheet. The weak areas of the fixing portion 31 and the cover body may be fixed by welding or bonding. The fixing portion 31 and the traction portion 32 may constitute the following different forms of unpacking devices.

The first traction part 32 is an annular structure and is welded at the weak area of the cover plate body;

the second traction part 32 is of an annular structure and is arranged in the middle of the fixing part 31, at this time, the fixing part 31 and the traction part 32 are of a T-shaped structure, and the structure can separate the opening device 3 and the weak area from the cover plate body through a traction rope;

and the third traction part 32 is two, and is respectively arranged at two sides of the fixing part 31, at this time, the fixing part 31 and the traction part 21 are integrally formed, the whole body is of a U-shaped structure, and the integral forming part can promote the rigidity of the whole package opening device 3.

In the above three-structure unpacking device, in the first type, the traction part 32 is directly welded to the weak area, so that the connection area between the traction part 32 and the weak area is small, the traction part 32 transmits the acting force of the unpacking tool to the weak area, and the weak area cannot be separated from the cover plate body due to the defect of weak welding; in the second unpacking device and the third unpacking device, the traction part 32 is connected with the weak area more reliably due to the fixing part 31, so that the weak area can be separated from the cover plate body more reliably. Meanwhile, in the third unpacking device, the two traction parts 32 can apply acting force at different positions of the weak area, so that the whole weak area can be separated from the cover plate body more reliably.

On the basis of the structure of the unpacking device 3, the traction part 32 is connected with the unpacking tool 4 for convenience, and the traction part 32 can be further provided with the hanging lug holes 33, so that the traction part 32 is connected with the hanging lugs 432 of the unpacking tool 4 through the hanging lug holes 33.

According to the invention, the unpacking device 3 is directly fixed on the battery cover plate, an opening is not required to be formed on the battery cover plate, and then the unpacking device is not required to be installed.

Example 2

As shown in fig. 1 to 2, the present embodiment provides a unit cell 1 including a cell housing and an electrode assembly provided in the cell housing, the cell housing including an upper cover plate 11, a lower cover plate 12 and a cylindrical body 13, the upper cover plate 11 being provided with a positive electrode column and a negative electrode column from which a current of the unit cell 1 is led out, at least one of the upper cover plate 11 and the lower cover plate 12 being the cell cover plate in embodiment 1. The battery cover plate comprises a cover plate body and a package opening device 3, wherein a weak area is formed in the cover plate body, and the package opening device 3 is fixed to the weak area of the cover plate body. When each single battery 1 forms a large-capacity battery, the opening device 3 and the weak area are integrally separated from the battery cover plate under the action of external force, and an opening is formed on the battery cover plate so as to enable electrolyte and gas of each single battery to be communicated.

In addition, in other embodiments, as shown in fig. 3, a weak area may be provided on the cylinder 13 of the unit cell 1, and at this time, the opening device 3 is connected to the cylinder 13 in the same manner as the upper cover 11 and the lower cover 12. When each single battery 1 forms a large-capacity battery, the opening device 3 and the weak area are separated from the cylinder body as a whole under the action of external force, and an opening is formed on the cylinder body 13 so as to enable electrolyte and gas of each single battery to pass through.

The structure of the large-capacity battery formed of the above-described unit batteries 1 is described below.

The large-capacity battery includes a battery pack body and a hollow member. The battery pack main body comprises a plurality of single batteries which are distributed along the X direction, the number of the single batteries can be adjusted according to the actual capacity requirement, and the single batteries are connected in parallel through electric connectors. Each single battery inner cavity comprises an electrolyte area and a gas area, and each single battery is provided with a bag opening device. When the high-capacity battery is formed, the opening device is separated from the battery shell of each single battery, at least one opening is formed on the battery shell, the inner cavity of each single battery is communicated with the hollow member, and then the electrolyte area of each single battery can be communicated (the high-capacity battery with a shared electrolyte system is formed), or the gas area of each single battery can be communicated (the high-capacity battery with a gas balance system is formed), or both the electrolyte area and the gas area of each single battery can be communicated (the high-capacity battery with both the shared electrolyte system and the gas balance system is formed).

When the single batteries are installed with the hollow member, the single batteries can be arranged outside the hollow member, namely, the single batteries are externally installed; each cell may be provided inside the hollow member, i.e., mounted in-house. The mounting and connection of each unit cell to the hollow member are described in detail below.

First, external installation;

as shown in fig. 4 to 6, when each unit cell 1 is disposed outside the hollow member 2, the number and the mounting position of the hollow member 2 are determined according to the functional system that the large-capacity battery is required to have.

When the electrolyte system is required to be shared, namely, the electrolytes among the single batteries 1 are communicated, one hollow member 2 is fixedly connected with the lower cover plate 12 or a cylinder 13 part close to one side of the lower cover plate of each single battery 1;

when a gas balance system is needed, namely, gas intercommunication among the single batteries 1 is needed, one hollow member 2 is fixedly connected with the upper cover plate 11 or a cylinder 13 part close to one side of the upper cover plate of each single battery 1;

when the shared electrolyte system and the gas balance system are needed to be simultaneously provided, namely, the electrolyte area and the gas area between the single batteries 1 are communicated, one mode is to adopt two hollow members 2, wherein one hollow member 2 is fixedly connected with the upper cover plate 11 of the single battery 1, and the other hollow member 2 is connected with the lower cover plate 12 of the single battery 1; the other mode is that a hollow member 2 is fixedly connected with the side wall of the cylinder 13 of each single battery 1, the position of the hollow member 2 arranged on the side wall of the cylinder needs to meet the requirement that the upper half part of the hollow member 2 is used for communicating with the gas area of each single battery 1, and the lower half part is used for communicating with the electrolyte area of each single battery 1.

The following description will be made in terms of a structure in which one hollow member 2 can realize both electrolyte sharing and gas sharing.

As shown in fig. 5, the hollow member 2 is of a split structure, and is mainly composed of a hollow case 21 having one end opened and a cover plate 22 for covering the opening; in order to facilitate subsequent processing and assembly, a hollow box 21 having a rectangular cross section is preferably employed. The hollow case 21 extends in the X direction and is fixed to the cylindrical body 13 of each unit cell 1. The barrel 13 of each single battery 1 is provided with a package opening device 3, the side wall of each hollow member 2 matched with each single battery 1 is provided with a plurality of first through holes 23, the package opening device 3 passes through the first through holes 23 on the barrel 13 and then is positioned in the hollow member 2, the number of the first through holes 23 can be the same as the number of the package opening devices 3 of all single batteries 1, the number of the package opening devices 3 of all single batteries 1 can be also reduced, and only the first through holes 23 are required to cover all the package opening devices 3. When the unpacking device 3 is separated from the cylinder 13 of each single battery 1, the inner cavity of each single battery 1 is communicated with the first through hole 23, and gas and electrolyte in each single battery 1 can enter the hollow member 2 through the opening on the cylinder 13 and the first through hole 23, and at this time, the gas is positioned at the upper half part of the hollow member 2, and the electrolyte is positioned at the lower half part of the hollow member 2.

With reference to the above manner, the hollow member 2 is connected identically to the lower cover plate 12 and the upper cover plate 11 of each unit cell 1, so that the electrolyte and gas between each unit cell 1 are communicated.

Second, built-in installation

As shown in fig. 7 and 8, when each unit cell 1 is disposed inside the hollow member 2, the hollow member 2 is a housing of the entire battery pack body, wherein the hollow member 2 may have a gas sharing chamber 210 at the top and an electrolyte sharing chamber 29 at the bottom. In this structure, the inner cavity of the hollow member 2 is a closed cavity, and after the battery pack body is mounted to the hollow member 2, the sealability of the entire cavity is required to be ensured. The hollow member 2 is also of a split type structure because of the need for a built-in battery pack body. For example, the hollow member 2 includes a U-shaped housing 25, a first cover plate 26, a third cover plate 27, and a second cover plate 28; the first cover plate 26 and the third cover plate 27 cover two opposite open ends of the U-shaped housing 25, respectively; the second cover plate 28 covers the top open end of the U-shaped housing 25 and is connected with the open end in a sealing manner, and the second cover plate 28 is provided with a second through hole 211 which enables the pole of each single battery 1 to extend out. After each single battery 1 is mounted in the hollow member 2, after the pole of each single battery 1 extends out of the second through hole 211, the outer shell area corresponding to the second through hole 211 is fixedly sealed with the battery shell of the single battery 1, and specifically, the edge of the second through hole 211 can be welded with the battery shell of the single battery 1 in the peripheral area of the pole to realize sealing. In addition, the U-shaped shell 25 and the second cover plate 28 can be integrated, and the integrated part is convenient to process and has low processing cost.

In the above structure, the bottom of the U-shaped housing 25 is provided with the electrolyte sharing chamber 29 extending in the X direction, and the second cover 28 is provided with the gas sharing chamber 210. The electrolyte sharing chamber 29 may take the following forms: 1. a groove recessed toward the outer surface may be directly formed on the inner surface of the bottom of the U-shaped housing 25 as the electrolyte sharing chamber 29; 2. a gap between the inner surface of the bottom of the U-shaped casing 25 and the outer surface of the lower cover plate 12 of each single battery 1 is used as an electrolyte sharing chamber 29; likewise, the gas sharing chamber 210 may take the following several structural forms: 1. taking the gap between the inner surface of the second cover plate 28 and the outer surface of the upper cover plate 11 of each single battery 1 as a gas sharing chamber 210; 2. a groove recessed toward the outer surface may be directly processed on the inner surface of the second cover plate 28 as the gas sharing chamber 210.

Wherein, the upper cover plate 11 and the lower cover plate 12 of each single battery 1 are respectively provided with a package opening device 3, the top of the hollow member 2 is provided with a gas sharing chamber 210, the bottom is provided with an electrolyte sharing chamber 29, when the package opening device 3 is separated from the upper cover plate 11 and the lower cover plate 12 of each single battery 1, the electrolyte of each single battery 1 is communicated through the electrolyte sharing chamber 29, and the gas is communicated through the gas sharing chamber 210.

In addition, the hollow member 2 may be provided with a liquid inlet 24, and electrolyte may be injected into the inner cavity of each unit cell 1 and the hollow member 2 through the liquid inlet 24, so that the electrolyte may be injected, replenished or exchanged for a large-capacity battery, regardless of whether the battery is mounted internally or externally. In the case of not pouring liquid, the pouring port 24 needs to be sealed by a stopper or a valve. When each unit cell 1 is unpacked (an opening is formed in the cell case), the liquid filling port 24 may also be used as an operation port through which the unpacking tool 4 is put into the hollow member 2, and then the unpacking device 3 of each unit cell 1 is separated from the cell case.

Example 3

As shown in fig. 9, this embodiment provides a unpacking tool for separating the unpacking device and the weak area in embodiment 1 and embodiment 2 from the single battery 1, and forming an opening on the single battery, that is, completing the unpacking operation on each single battery 1, so as to realize gas sharing, electrolyte sharing, or gas electrolyte sharing of each single battery 1 in a large-capacity battery.

As shown in fig. 10 and 11, the unpacking tool 4 provided in the present embodiment includes a guide block 41, a push rod 42, and a plurality of pulling members 43; the guide block 41 is internally provided with a first channel 411 penetrating along the X direction and a plurality of containing grooves 412 penetrating along the Y direction, and the containing grooves 412 are arranged along the X direction and are communicated with the first channel 411; the traction piece 43 is positioned in the accommodating groove 412 and is respectively used for being connected with the package opening device 3 of each single battery 1; the pulling member 43 is provided with a second channel 431 parallel to the first channel 411, the first channel 411 and the second channel 431 have a certain height difference, and when the push rod 42 slides from the first channel 411 to the second channel 431, the pulling member 43 moves in the accommodating groove 412 along the Y direction, so that the unpacking device 3 of each single battery 1 is separated from the battery case.

In this embodiment, the guide block 41 is specifically a long block structure, and its length is adapted to the length of each unit cell 1 after being aligned in the X direction. The guide block 41 preferably adopts a cylinder structure with a semicircular cross section, and the semicircular cylinder structure is convenient and quick when being taken out from the shared cavity, so that the blockage during taking out is avoided. During the unpacking process of the single battery, the first channel 411 on the guide block 41 provides a sliding channel for the push rod 42, and simultaneously plays a guiding role on the sliding of the push rod 42. The pulling member 43 is installed in the accommodating groove 412 on the guide block 41, the pulling member 43 is connected with the unpacking device 3 of the single battery before unpacking, and after unpacking, the pulling member 43, the unpacking device 3 and the weak area of the battery shell are reserved in the accommodating groove 412 and taken out together with the guide block 41.

The pulling member 43 and the unpacking device 3 of the unit battery 1 may be connected in various manners, as long as the unpacking device 3 and the pulling member can be engaged, for example, the ear-hanging hole 33 of each unit battery 1 and the pulling member 43 are connected by a latch. In this embodiment, the two sides of the pulling member 43 are provided with the hanging lugs 432, the pulling member 43 is connected with the hanging lug holes 33 of the unpacking device 3 in a matched manner through the hanging lugs 432, and when the unpacking device is connected with the unpacking tool, the structure is simple in installation process, and the unpacking device 3 and the pulling member 43 can be connected only by simple operation.

In this embodiment, the push rod 42 is embodied as an elongated rod, either a solid rod or a hollow rod. The cross-sectional shape of the pushrod 42 is preferably adapted to the shape of the first channel 411 and the second channel 431 to reduce the resistance of the pushrod 42 to sliding within the first channel 411 and the second channel 431 to facilitate sliding of the pushrod 42 within the first channel 411 and the second channel 431. In addition, an operation handle can be arranged on the push rod 42, so that an operator can conveniently operate the push rod 42 on site. In this embodiment, the mating surface of the push rod 42 and the pulling member 43 is a wedge surface, i.e. one end of the second channel 431 has a first wedge surface, and the end of the push rod 42 is provided with a second wedge surface 421 that mates with the first wedge surface. When the structure is unpacked, the push rod 42 pulls the pulling piece 43 downwards, the operation process is smooth, the unpacking resistance is small, and the unpacking process is rapid.

The unpacking process of each unit cell 1 will be described below with respect to the case where each unit cell 1 and the hollow member 2 are mounted in a built-in manner.

S1, fixing the unpacking devices 3 on the lower cover plate of each single battery 1, then connecting the traction pieces 43 with each unpacking device 3, and finally, installing the guide blocks 41 below each single battery 1, wherein each traction piece 43 is uniformly and correspondingly positioned in each containing groove 412;

s2, installing a plurality of single batteries 1 with a package opening device 3, a traction piece 43 and a guide block 41 into the U-shaped shell 25;

s3, sealing and mounting the first cover plate 26, the third cover plate 27 and the second cover plate 28 on the U-shaped shell 25, wherein one end of the guide block 41 extends out of the liquid injection port 24 of the first cover plate 26;

s4, in a set environment, the unpacking tool 4 separates the unpacking devices 3 of the single batteries 1 from the single batteries 1 in sequence, and forms openings on the single batteries 1, wherein the specific process is as follows:

in general, the setting environment is preferably an environment with the dew point standard of-25 ℃ to-40 ℃ and the temperature of 23+/-2 ℃ and the cleanliness of 10 ten thousand grades; the push rod 42 extends into the first channel 411 of the guide block 41, when the push rod 42 slides to the second channel 431 in the first channel 411, the pulling piece 43 moves in the Y direction in the accommodating groove 412 under the acting force of the push rod 42, the unpacking device 3 of the single battery 1 is separated from the lower cover plate of the single battery 1, an opening is formed in the lower cover plate of the single battery 1, and at the moment, a weak area separated from the lower cover plate of the single battery 1 and the unpacking device 3 are left in the accommodating groove 412; then, the push rod 42 continues to slide forward, and unpacking is performed on the next single battery 1 until unpacking operation is performed on all single batteries 1;

s5, taking out the guide block 41 and the push rod 42 which bear the weak area and the opening device 3 from the liquid injection port 24, and communicating the electrolyte area of each single battery 1 with the electrolyte sharing chamber of the hollow member 2 to achieve the effects of electrolyte intercommunication and gas intercommunication of a plurality of single batteries 1.

As can be seen from the above process, the unpacking tool 4 provided by the invention can reliably separate the weak area and the unpacking device 3 of each single battery 1 from the battery shell, reliably realize the unpacking operation of each single battery 1, and avoid the risk that the opening on the battery shell is smaller or the unpacking device 3 cannot be opened in the manufacturing process of the existing high-capacity battery. Meanwhile, when the unpacking tool 4 is taken out from the hollow member 2, the weak area and the unpacking device 3 of each single battery 1 are taken out along with the unpacking tool 4, so that the influence on the large-capacity battery 1 caused by the fact that the weak area and the unpacking device 3 are detained in the shared cavity after the single batteries 1 are unpacked is avoided.

Claims (10)

1. The utility model provides a battery apron, its characterized in that includes apron body and unpacks the device, be equipped with the weak area on the apron body, unpack the device and fix to the weak area of apron body on, under the exogenic action, should unpack the device and break away from the apron body with the weak area to make battery apron form the opening.

2. The battery cover of claim 1, wherein the opening device comprises a traction portion and a fixing portion, the traction portion being connected to the weakened area of the cover body by the fixing portion.

3. The battery cover plate according to claim 2, wherein the number of the traction portions is two, the two traction portions and the fixing portion are integrally formed into a U-shaped structure, and the two traction portions are provided with lug hanging holes.

4. A battery cover plate according to any one of claims 1 to 3, wherein a ring-shaped groove is provided on the cover plate body, and the area defined by the ring-shaped groove is a weak area.

5. The battery cover plate of claim 4, wherein the cross section of the annular groove is U-shaped or V-shaped.

6. The battery cover of claim 5, wherein the weakened areas are in the shape of a drop, a circle, or a racetrack.

7. The utility model provides a single battery, its characterized in that includes the battery casing, be equipped with electrode assembly in the battery casing, the battery casing includes upper cover plate, lower apron and barrel, be provided with anodal post and negative pole post on the upper cover plate, at least one of upper cover plate and lower apron adopts the battery apron of any one of claims 1 to 6.

8. A unpacking tool for separating the unpacking device according to any one of claims 1 to 7 from a cover plate body, characterized in that the unpacking tool comprises a guide block, a push rod and a plurality of traction members;

the guide block is internally provided with a first channel penetrating along the X direction and a plurality of containing grooves penetrating along the Y direction, and the containing grooves are distributed along the X direction and are communicated with the first channel;

the traction piece is positioned in the accommodating groove and is respectively used for being connected with the opening device of each single battery;

the pulling piece is provided with a second channel parallel to the first channel, the first channel and the second channel have height difference, and when the first channel slides to the second channel, the pushing rod moves in the containing groove along the Y direction to separate the unpacking device of each single battery from the cover plate body, so that the cover plate body forms an opening.

9. The unpacking tool of claim 8, wherein one end of the second channel has a first wedge surface and the end of the push rod has a second wedge surface that mates with the first wedge surface.

10. The unpacking tool of claim 9, wherein the pulling member has lugs on both sides for mating with lug holes in the unpacking device.