CN218957880U - Battery cell shell, battery cell and high-capacity battery - Google Patents

Abstract

The utility model discloses a battery cell shell, a battery cell and a high-capacity battery, wherein a soft package battery cell or an electrode assembly is arranged in the shell and then connected through a current collecting pipe to form a battery cell group; the battery cell shell is provided with a guide pipe protruding out of the shell body, the collecting pipe is provided with a plurality of first through holes, and the guide pipe is connected with the collecting pipe in a sealing way through the first through holes when the battery cell group is formed; the guide pipe and the collecting pipe form an explosion venting channel of the battery cell group, and at least one end of the collecting pipe is provided with a smoke outlet; or the conduit and the collecting pipe form an electrolyte sharing pipeline of the battery cell group, and the electrolyte sharing channel is provided with an explosion venting assembly. The electrolyte sharing channel or the explosion venting channel is formed by combining the collecting pipe and the guide pipe, so that the electric core in the high-capacity battery can be in a unified electrolyte environment, the uniformity and the yield of the electric core are obviously improved, or the thermal runaway flue gas can be guided to a designated position, and the safety of the whole explosion venting is improved.

Description

Battery cell shell, battery cell and high-capacity battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cell shell, a battery cell and a high-capacity battery.

Background

The square battery with the maximum capacity in the lithium battery in the current market is 300Ah, and is influenced by the battery capacity, and the lithium battery needs to be connected in series and parallel with a plurality of batteries when in energy storage application, so that the connecting parts are various, the connecting steps are complex and tedious, the consumption of a battery management system, wires and a battery box is very large, and the energy storage cost is high.

How to combine small-capacity cells into large-capacity batteries and to have stronger safety and higher yield is a problem to be solved, wherein the problems of handling of thermal runaway fumes and electrolyte sharing are particularly prominent.

At present, a plurality of battery cells are mainly connected in parallel to a large box body to form a large-capacity battery, chinese patent CN101286577A discloses a high-power lithium ion battery, the high-power lithium ion power battery comprises a plurality of parallel single battery cells, each single battery cell comprises a positive plate, a negative plate, a diaphragm and 2-8 positive electrode lugs and negative electrode lugs, the positive electrode lugs and the positive electrode lugs are integrated and are punched out on a current collector aluminum foil of the positive electrode lugs, the negative electrode lugs and the negative electrode lugs are integrated and are punched out on a current collector copper foil of the negative electrode lugs, the positive electrode lugs of all single battery cells are welded on the positive electrode lugs, and all negative electrode lugs are welded on the negative electrode lugs to form the large-capacity battery. Chinese patent CN111370775a discloses a high-capacity battery and its manufacturing method, the battery comprises an aluminum shell, a cylindrical winding core, a positive electrode cover plate, a negative electrode cover plate, a positive electrode confluence sheet, a negative electrode confluence sheet, a silica gel sheet and a battery support, the cylindrical winding core is composed of a winding core body and a metal cylindrical tube, and is of an electrodeless ear structure; a cylindrical winding core is arranged in the aluminum shell, and the positive electrode terminal and the negative electrode terminal of the cylindrical winding core are welded with the positive electrode and negative electrode busbar sheets to form a winding core group; the device is used for forming a large-capacity battery with a plurality of winding cores connected in parallel.

The high-capacity battery improves the capacity of the battery through parallel connection of the battery cells, but the quality of each battery cell cannot be effectively controlled before the large battery is formed, and the yield of the large battery cannot be improved.

Disclosure of Invention

In order to solve the problems, the utility model adopts a technical scheme that a battery cell shell is provided, and a battery cell group is formed by connecting a soft package battery cell or an electrode assembly in the battery cell shell through a collecting pipe; the battery cell shell is provided with a guide pipe protruding out of the shell body, the collecting pipe is provided with a plurality of first through holes, and the guide pipe is connected with the collecting pipe in a sealing way through the first through holes when the battery cell group is formed;

the guide pipe and the collecting pipe form an explosion venting channel of the battery cell group, and at least one end of the collecting pipe is provided with a smoke outlet; or (b)

The conduit and the collecting pipe form an electrolyte sharing pipeline of the battery cell group, and the electrolyte sharing pipeline is provided with an explosion venting assembly.

Further, the conduit is sealed through the first through hole inserted into one end of the collecting pipe, and a second through hole is circumferentially arranged on the conduit wall.

Further, the collecting pipe further comprises a third through hole, and the conduit penetrates through the first through hole and the third through hole in sequence and then is fixedly connected with the collecting pipe.

Further, the collecting pipe is further provided with a fixing piece, and the fixing piece is fixedly arranged at one end of the conduit which sequentially penetrates through the first through hole and the third through hole, so that the conduit is fixed on the collecting pipe.

Further, a sealing gasket is arranged on the first through hole and/or the third through hole, and the sealing gasket is provided with a first groove for accommodating the collecting pipe.

Further, the battery cell casing is further provided with an installation piece, the installation piece comprises a first installation block and a second installation block which can be covered, a second groove for accommodating the collecting pipe is formed between the first installation block and the second installation block, and the guide pipe sequentially penetrates through the first installation block, the collecting pipe and the second installation block and is locked and fixed by a fixing piece.

Further, the fixing piece is a nut, and one end of the guide pipe is provided with threads matched with the nut.

Further, the guide pipe is arranged at the bottom of the battery cell shell.

In order to solve the above problems, the present utility model provides a battery cell, including a battery cell housing.

In order to solve the problems, the utility model adopts a technical scheme that a high-capacity battery is provided and comprises a battery cell group formed by the battery cells.

Further, a soft package battery cell is arranged in the battery cell shell; when a plurality of electric cores are connected to form an electric core group, a collecting pipe on the electric core shell is connected to form an explosion venting channel of the electric core group, and at least one end of the explosion venting channel is provided with a thermal runaway flue gas outlet; or (b)

An electrode assembly is placed in the battery cell shell; when a plurality of electric cores are connected to form an electric core group, a sealing sheet is arranged in the guide pipe to seal the guide pipe, and the sealing sheet is dissolved when meeting electrolyte or is opened under the action of external force; the collecting pipe on the cell shell is connected to form an electrolyte sharing pipeline of the cell group so that electrolyte can circulate among the cells; the electrolyte sharing pipeline is also provided with an explosion venting component.

Further, the explosion venting assembly is provided with a detachable port for injecting electrolyte.

The utility model has the beneficial effects that: when the electrode assembly is arranged in the battery cell shell, the electrolyte sharing channel of the battery cell group is formed in a mode of combining and fixing the collecting pipe and the guide pipes on each battery cell shell, so that the battery cells in the large-capacity battery can be in a unified electrolyte injection environment, the uniformity and the yield of the battery cells are obviously improved, and convenience is brought to the later-stage electrolyte supplementing and electrolyte replacing; when the soft package battery core is arranged in the battery core shell, the explosion venting channel of the battery core group is formed in a mode that the collecting pipe is combined and fixed with the guide pipes on each battery core shell, so that the thermal runaway flue gas can be guided to a designated position, and the overall explosion venting safety is improved. The integrated design of pipeline and electric core casing for electric core casing's integrated level is higher, simplifies assembly procedure, simple structure, excellent in use effect.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a cell stack according to an embodiment;

FIG. 2 is a schematic diagram of a cell stack according to an embodiment;

FIG. 3 is a schematic diagram of a cell stack according to an embodiment;

fig. 4 is a schematic structural diagram of a cell housing in one embodiment.

Reference numerals:

10-shell

100-cell group

101-upper cover plate

102-lower cover plate

103-barrel

104-reinforcing rib

105-glue injection hole

11-catheter

12-second through hole

131-first sealing gasket

132-second gasket

133-first groove

141-first mounting member

142-second mounting member

143-second groove

15-explosion venting assembly

16-plug

18-sealing film

20-manifold

21-first through hole

22-third through hole

23-fixing piece

Detailed Description

Although embodiments of the utility model have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present utility model. Additional modifications will readily occur to those skilled in the art. Therefore, the utility model is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

Hereinafter, a battery cell case, a battery cell, and a large-capacity battery of the present application are specifically disclosed with reference to the accompanying drawings as appropriate. However, unnecessary detailed description may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of the actual same structure may be omitted. This is to avoid that the following description becomes unnecessarily lengthy, facilitating the understanding of those skilled in the art. Furthermore, the drawings and the following description are provided for a full understanding of the present application by those skilled in the art, and are not intended to limit the subject matter recited in the claims.

All embodiments and alternative embodiments of the present application may be combined with each other to form new solutions, unless specifically stated otherwise. All technical features and optional technical features of the present application may be combined with each other to form new technical solutions, unless specified otherwise.

Reference herein to "comprising" and "including" means open ended, as well as closed ended, unless otherwise noted. For example, "comprising" and "including" may mean that other components not listed may also be included or included, or that only listed components may be included or included.

It is further understood that the terms "first," "second," and the like, are merely used to distinguish one entity or action from another entity or action and do not necessarily require or imply any actual relationship or order between such entities or actions.

Example 1

As shown in fig. 1-4, a schematic structure of a battery cell casing and a battery cell group is shown, wherein a battery cell casing 10 is internally provided with a soft package battery cell and then connected by a current collecting pipe 20 to form a battery cell group 100; the cell casing 10 is provided with a conduit 11 protruding out of the casing body, the collecting pipe 20 is provided with a plurality of first through holes 21, and when the cell group 100 is formed, the conduit 11 is in sealing connection with the collecting pipe 20 through the first through holes 21; the conduit 11 and the collecting pipe 20 form an explosion venting channel of the battery cell group 100, and at least one end of the collecting pipe 20 is provided with a smoke outlet. When thermal runaway happens to any cell in the cell group, the thermal runaway flue gas is discharged into the collecting pipe 20 through the conduit 11 and the first through hole 21, and then the thermal runaway flue gas is discharged to a designated place for treatment through a flue gas outlet arranged on the collecting pipe 20, for example, one end of the explosion venting channel is connected with a thermal runaway flue gas treatment device, and the thermal runaway flue gas is cooled and adsorbed or ignited.

In some embodiments, to facilitate the sealing installation between the conduit 11 and the manifold 20, one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is closed, or one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is tightly pressed against the inner wall of the manifold 20, at this time, the thermal runaway flue gas in the cell housing will enter the manifold 20 from the second through hole 12 circumferentially arranged on the wall of the conduit 11.

In some embodiments, the manifold 20 is further provided with a third through hole 22, so that the conduit 11 is fixedly connected to the manifold 20 after passing through the first through hole 21 and the third through hole 22 in sequence. The conduit 11 and the manifold 20 may be bonded or welded, or may be fixedly connected to one end of the conduit 11 by a fixing member 23 after the conduit 11 passes through the manifold 20. The fixing member 23 is preferably a bolt, and a thread is correspondingly arranged at one end of the conduit 11, and after the conduit 11 passes through the manifold 20, the conduit 11 is locked and fixed on the manifold 20 by the bolt, so that the later disassembly, cleaning, maintenance and the like are facilitated.

In order to further ensure the tightness and stability between the conduit 11 and the collecting pipe 20, a first sealing pad 131 and a second sealing pad 132 are arranged at two ends of the collecting pipe 20, a first groove 133 for accommodating the collecting pipe 20 is further arranged between the two sealing pads, the conduit 11 passes through the sealing pads and then is fixed with the collecting pipe 20, and the sealing pads also have the buffering effect, so that the buffer and shock absorption are facilitated when the high-capacity battery is carried, and the air tightness of each connecting port is ensured.

Still further to ensure the stability of the conduit 11, a first mounting member 141 and a second mounting member 142 are provided at both ends of the conduit, and a second groove 143 for receiving the manifold 20 is provided between the first mounting member 141 and the second mounting member 142. The first mounting member 141 is disposed on the lower cover 102 and integrally disposed with the conduit 11, and the conduit 11 passes through the first sealing pad 131, the collecting pipe 20, the second sealing pad 132, and the second mounting member 142 in order, and then the conduit 11 is fixedly locked to the collecting pipe by the fixing member 23. The collecting pipe 20 is provided with a plug 16 at one end and a explosion venting assembly 15 at the other end.

In some embodiments, the conduit is disposed on the lower cover 102 of the cell housing, the upper cover 101 of the cell housing is provided with positive and negative posts, or the upper cover 101 is provided with an electrical bussing assembly. The battery case 103 is provided with a reinforcing rib 104. The upper cover plate is also provided with a glue injection hole 105 for injecting heat-conducting glue into the battery cell shell, and the heat of the battery cell is more uniform while the soft package battery cell is fixed.

Example 2

As shown in fig. 1-4, a schematic structure of a battery cell casing and a battery cell group is shown, wherein a battery cell casing 10 is internally provided with a soft package battery cell and then connected by a current collecting pipe 20 to form a battery cell group 100; the cell casing 10 is provided with a guide pipe 11 protruding out of the casing body, the collecting pipe 20 is provided with a plurality of first through holes 21, and when the cell group is formed, the guide pipe 11 is in sealing connection with the collecting pipe 20 through the first through holes 21; the conduit 11 and the collecting pipe 20 form an electrolyte sharing channel of the cell group, and at least one end of the collecting pipe 20 is provided with an explosion venting assembly 15. The explosion venting assembly 15 is provided with a removable port for injecting electrolyte.

In this embodiment, the cell casing is used for internally arranging the electrode assembly and forming a cell group for a high-capacity battery, and at this time, the cells are mounted with the manifold 20 through the conduit 11 on the cell casing to form an electrolyte sharing channel of the cell group. After the electrolyte sharing channel is formed by the installation of the guide pipe 11 and the collecting pipe 20, electrolyte injected through the liquid injection mechanism enters the cell shell through the guide pipe 11, so that all cells in the cell group are in a uniform electrolyte environment, and the uniformity of the cell group can be effectively improved. The electrolyte filling mechanism can also be used for replenishing and replacing the electrolyte of the battery cell group, when the battery cell group is used for a certain period of time, the electrolyte is lost, and at the moment, the electrolyte is extracted and replaced with new electrolyte or the new electrolyte is directly replenished, so that the service life of the high-capacity battery can be prolonged. One end of the electrolyte sharing channel is also provided with an explosion venting component, any cell in the cell group is subject to thermal runaway, the generated thermal runaway smoke is collected into the collecting pipe 20 through the guide pipe and discharged to a designated place for effective treatment, and the treatment mode is as follows: and cooling and adsorbing the thermal runaway flue gas, or discharging the thermal runaway flue gas after igniting the thermal runaway flue gas.

In some embodiments, to facilitate the sealing installation between the conduit 11 and the manifold 20, one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is closed, or one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is tightly pressed against the inner wall of the manifold 20, and at this time, the thermal runaway flue gas or electrolyte in the cell housing enters the manifold 20 from the second through hole 12 circumferentially provided in the wall of the conduit 11.

In some embodiments, a third through hole is further formed in the manifold, so that the conduit 11 is fixedly connected to the manifold 20 after passing through the first through hole 21 and the third through hole 22 in sequence. The conduit 11 and the manifold 20 may be bonded or welded, or may be fixedly connected to one end of the conduit 11 by a fixing member 23 after the conduit 11 passes through the manifold 20. The fixing member 23 is preferably a bolt, and a thread is correspondingly arranged at one end of the conduit 11, and after the conduit 11 passes through the manifold 20, the conduit 11 is locked and fixed on the manifold 20 by the bolt, so that the later disassembly, cleaning, maintenance and the like are facilitated.

In order to further ensure the tightness and stability between the conduit 11 and the collecting pipe 20, a first sealing pad 131 and a second sealing pad 132 are arranged at two ends of the collecting pipe 20, a first groove 133 for accommodating the collecting pipe 20 is further arranged between the two sealing pads, the conduit 11 passes through the sealing pads and then is fixed with the collecting pipe 20, and the sealing pads can also play a buffering role, so that the buffer shock absorption is facilitated during the carrying of the high-capacity battery, and the air tightness of each connecting port is ensured.

Still further to ensure the stability of the conduit 11, a first mounting member 141 and a second mounting member 142 are provided at both ends of the conduit, and a second groove 143 for receiving the manifold 20 is provided between the first mounting member 141 and the second mounting member 142. The first mounting member 141 is disposed on the lower cover plate and integrally disposed with the conduit 11, and the conduit 11 passes through the first sealing pad 131, the collecting pipe 20, the second sealing pad 132, and the second mounting member 142 in order, and then the conduit 11 is fixedly locked to the collecting pipe by the fixing member 23. The collecting pipe 20 is provided with a plug 16 at one end and a explosion venting assembly 15 at the other end. The explosion venting assembly 15 is provided with a removable port for injecting electrolyte.

In some embodiments, a sealing membrane 18 is disposed within conduit 11. The sealing film 18 is used to protect the electrode assembly from air before the battery is formed into a component, or to open the electrode assembly by external force during electrolyte replenishment and replacement, so that the cell housing forms an opening, and the electrolyte can enter the cell housing. The external force used to open the sealing membrane 18 may be a dedicated tooling. When electrolyte needs to be replenished or replaced, the electrolyte is injected into the collecting pipe 20 through the electrolyte injection device, and the electrolyte is uniformly introduced into all the cells in the cell group after the sealing film 18 is dissolved.

In some embodiments, the sealing film 18 is further attached with a protective film, and the sealing film 18 can be dissolved when meeting electrolyte, in order to avoid that the electrolyte in the battery cell dissolves the sealing film 18 in advance, a protective film should be attached to the sealing film 18, when the electrolyte needs to be replenished and replaced, the electrolyte enters the electrode liquid sharing channel, and after the sealing film 18 meets the electrolyte, the protective film attached to the electrolyte also falls off, so that the electrolyte can enter the battery cell shell. The mode avoids using other tools, has low requirements on the operation environment, and can ensure that the cell assembly is not exposed to the air by only timely sealing the electrolyte sharing channel after the electrolyte is injected.

In some embodiments, the conduit is disposed on the lower cover 102 of the cell housing, the upper cover 101 of the cell housing is provided with positive and negative posts, or the upper cover 101 is provided with a bussing assembly. The battery case 103 is provided with a reinforcing rib 104. The upper cover plate is also provided with a glue injection hole 105 for injecting heat-conducting glue into the battery cell shell, and the heat of the battery cell is more uniform while the soft package battery cell is fixed.

Example 3

The embodiment provides a battery cell for forming a battery cell group. As shown in fig. 1-4, a schematic structure of a battery cell casing and a battery cell group is shown, wherein a battery cell casing 10 is internally provided with a soft package battery cell and then connected by a current collecting pipe 20 to form a battery cell group 100; the cell casing 10 is provided with a conduit 11 protruding out of the casing body, the collecting pipe 20 is provided with a plurality of first through holes 21, and when the cell group 100 is formed, the conduit 11 is in sealing connection with the collecting pipe 20 through the first through holes 21; the conduit 11 and the collecting pipe 20 form an explosion venting channel of the battery cell group 100, and at least one end of the collecting pipe 20 is provided with a smoke outlet. When thermal runaway happens to any cell in the cell group, the thermal runaway flue gas is discharged into the collecting pipe 20 through the conduit 11 and the first through hole 21, and then the thermal runaway flue gas is discharged to a designated place for treatment through a flue gas outlet arranged on the collecting pipe 20, for example, one end of the explosion venting channel is connected with a thermal runaway flue gas treatment device, and the thermal runaway flue gas is cooled and adsorbed or ignited.

In some embodiments, to facilitate the sealing installation between the conduit 11 and the manifold 20, one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is closed, or one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is tightly pressed against the inner wall of the manifold 20, at this time, the thermal runaway flue gas in the cell housing will enter the manifold 20 from the second through hole 12 circumferentially arranged on the wall of the conduit 11.

In some embodiments, the manifold 20 is further provided with a third through hole 22, so that the conduit 11 is fixedly connected to the manifold 20 after passing through the first through hole 21 and the third through hole 22 in sequence. The conduit 11 and the manifold 20 may be bonded or welded, or may be fixedly connected to one end of the conduit 11 by a fixing member 23 after the conduit 11 passes through the manifold 20. The fixing member 23 is preferably a bolt, and a thread is correspondingly arranged at one end of the conduit 11, and after the conduit 11 passes through the manifold 20, the conduit 11 is locked and fixed on the manifold 20 by the bolt, so that the later disassembly, cleaning, maintenance and the like are facilitated.

In order to further ensure the tightness and stability between the conduit 11 and the collecting pipe 20, a first sealing pad 131 and a second sealing pad 132 are arranged at two ends of the collecting pipe 20, a first groove 133 for accommodating the collecting pipe 20 is further arranged between the two sealing pads, the conduit 11 passes through the sealing pads and then is fixed with the collecting pipe 20, and the sealing pads also have the buffering effect, so that the buffer and shock absorption are facilitated when the high-capacity battery is carried, and the air tightness of each connecting port is ensured.

Still further to ensure the stability of the conduit 11, a first mounting member 141 and a second mounting member 142 are provided at both ends of the conduit, and a second groove 143 for receiving the manifold 20 is provided between the first mounting member 141 and the second mounting member 142. The first mounting member 141 is disposed on the lower cover 102 and integrally disposed with the conduit 11, and the conduit 11 passes through the first sealing pad 131, the collecting pipe 20, the second sealing pad 132, and the second mounting member 142 in order, and then the conduit 11 is fixedly locked to the collecting pipe by the fixing member 23. The collecting pipe 20 is provided with a plug 16 at one end and a explosion venting assembly 15 at the other end.

In some embodiments, the conduit is disposed on the lower cover 102 of the cell housing, the upper cover 101 of the cell housing is provided with positive and negative posts, or the upper cover 101 is provided with an electrical bussing assembly. The battery case 103 is provided with a reinforcing rib 104. The upper cover plate is also provided with a glue injection hole 105 for injecting heat-conducting glue into the battery cell shell, and the heat of the battery cell is more uniform while the soft package battery cell is fixed.

Example 4

As shown in fig. 1-4, a schematic structure of a battery cell casing and a battery cell group is shown, wherein a battery cell casing 10 is internally provided with a soft package battery cell and then connected by a current collecting pipe 20 to form a battery cell group 100; the cell casing 10 is provided with a guide pipe 11 protruding out of the casing body, the collecting pipe 20 is provided with a plurality of first through holes 21, and when the cell group is formed, the guide pipe 11 is in sealing connection with the collecting pipe 20 through the first through holes 21; the conduit 11 and the collecting pipe 20 form an electrolyte sharing channel of the cell group, and at least one end of the collecting pipe 20 is provided with an explosion venting assembly 15. The explosion venting assembly 15 is provided with a removable port for injecting electrolyte.

In this embodiment, the cell casing is used for internally arranging the electrode assembly and forming a cell group for a high-capacity battery, and at this time, the cells are mounted with the manifold 20 through the conduit 11 on the cell casing to form an electrolyte sharing channel of the cell group. After the electrolyte sharing channel is formed by the installation of the guide pipe 11 and the collecting pipe 20, electrolyte injected through the liquid injection mechanism enters the cell shell through the guide pipe 11, so that all cells in the cell group are in a uniform electrolyte environment, and the uniformity of the cell group can be effectively improved. The electrolyte filling mechanism can also be used for replenishing and replacing the electrolyte of the battery cell group, when the battery cell group is used for a certain period of time, the electrolyte is lost, and at the moment, the electrolyte is extracted and replaced with new electrolyte or the new electrolyte is directly replenished, so that the service life of the high-capacity battery can be prolonged. One end of the electrolyte sharing channel is also provided with an explosion venting component, any cell in the cell group is subject to thermal runaway, the generated thermal runaway smoke is collected into the collecting pipe 20 through the guide pipe and discharged to a designated place for effective treatment, and the treatment mode is as follows: and cooling and adsorbing the thermal runaway flue gas, or discharging the thermal runaway flue gas after igniting the thermal runaway flue gas.

In some embodiments, to facilitate the sealing installation between the conduit 11 and the manifold 20, one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is closed, or one end of the conduit 11 inserted into the manifold 20 through the first through hole 21 is tightly pressed against the inner wall of the manifold 20, and at this time, the thermal runaway flue gas or electrolyte in the cell housing enters the manifold 20 from the second through hole 12 circumferentially provided in the wall of the conduit 11.

In some embodiments, a third through hole is further formed in the manifold, so that the conduit 11 is fixedly connected to the manifold 20 after passing through the first through hole 21 and the third through hole 22 in sequence. The conduit 11 and the manifold 20 may be bonded or welded, or may be fixedly connected to one end of the conduit 11 by a fixing member 23 after the conduit 11 passes through the manifold 20. The fixing member 23 is preferably a bolt, and a thread is correspondingly arranged at one end of the conduit 11, and after the conduit 11 passes through the manifold 20, the conduit 11 is locked and fixed on the manifold 20 by the bolt, so that the later disassembly, cleaning, maintenance and the like are facilitated.

In order to further ensure the tightness and stability between the conduit 11 and the collecting pipe 20, a first sealing pad 131 and a second sealing pad 132 are arranged at two ends of the collecting pipe 20, a first groove 133 for accommodating the collecting pipe 20 is further arranged between the two sealing pads, the conduit 11 passes through the sealing pads and then is fixed with the collecting pipe 20, and the sealing pads can also play a buffering role, so that the buffer shock absorption is facilitated during the carrying of the high-capacity battery, and the air tightness of each connecting port is ensured.

Still further to ensure the stability of the conduit 11, a first mounting member 141 and a second mounting member 142 are provided at both ends of the conduit, and a second groove 143 for receiving the manifold 20 is provided between the first mounting member 141 and the second mounting member 142. The first mounting member 141 is disposed on the lower cover plate and integrally disposed with the conduit 11, and the conduit 11 passes through the first sealing pad 131, the collecting pipe 20, the second sealing pad 132, and the second mounting member 142 in order, and then the conduit 11 is fixedly locked to the collecting pipe by the fixing member 23. The collecting pipe 20 is provided with a plug 16 at one end and a explosion venting assembly 15 at the other end. The explosion venting assembly 15 is provided with a removable port for injecting electrolyte.

In some embodiments, a sealing membrane 18 is disposed within conduit 11. The sealing film 18 is used to protect the electrode assembly from air before the battery is formed into a component, or to open the electrode assembly by external force during electrolyte replenishment and replacement, so that the cell housing forms an opening, and the electrolyte can enter the cell housing. The external force used to open the sealing membrane 18 may be a dedicated tooling. When electrolyte needs to be replenished or replaced, the electrolyte is injected into the collecting pipe 20 through the electrolyte injection device, and the electrolyte is uniformly introduced into all the cells in the cell group after the sealing film 18 is dissolved.

In some embodiments, the sealing film 18 is further attached with a protective film, and the sealing film 18 can be dissolved when meeting electrolyte, in order to avoid that the electrolyte in the battery cell dissolves the sealing film 18 in advance, a protective film should be attached to the sealing film 18, when the electrolyte needs to be replenished and replaced, the electrolyte enters the electrode liquid sharing channel, and after the sealing film 18 meets the electrolyte, the protective film attached to the electrolyte also falls off, so that the electrolyte can enter the battery cell shell. The mode avoids using other tools, has low requirements on the operation environment, and can ensure that the cell assembly is not exposed to the air by only timely sealing the electrolyte sharing channel after the electrolyte is injected.

In some embodiments, the conduit is disposed on the lower cover 102 of the cell housing, the upper cover 101 of the cell housing is provided with positive and negative posts, or the upper cover 101 is provided with a bussing assembly. The battery case 103 is provided with a reinforcing rib 104. The upper cover plate is also provided with a glue injection hole 105 for injecting heat-conducting glue into the battery cell shell, and the heat of the battery cell is more uniform while the soft package battery cell is fixed.

Example 5

This embodiment provides a large-capacity battery including a battery cell group composed of the battery cells described in embodiment 3.

Example 6

This embodiment provides a high-capacity battery including a cell stack composed of the cells described in embodiment 4.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. Guidance is provided throughout this application by a series of embodiments, which may be used in various combinations. In the various examples, the list is merely a representative group and should not be construed as exhaustive.

Claims (12)

1. The battery cell shell is characterized in that a soft package battery cell or an electrode assembly is arranged in the battery cell shell and then connected through a collecting pipe to form a battery cell group; the battery cell shell is provided with a guide pipe protruding out of the shell body, the collecting pipe is provided with a plurality of first through holes, and the guide pipe is connected with the collecting pipe in a sealing way through the first through holes when the battery cell group is formed;

the guide pipe and the collecting pipe form an explosion venting channel of the battery cell group, and at least one end of the collecting pipe is provided with a smoke outlet; or (b)

The conduit and the collecting pipe form an electrolyte sharing pipeline of the battery cell group, and the electrolyte sharing pipeline is provided with an explosion venting assembly.

2. The cell housing of claim 1, wherein the conduit is closed at one end inserted into the manifold through the first through hole, and a second through hole is circumferentially provided in the conduit wall.

3. The cell housing of claim 2, wherein the manifold further comprises a third through hole, and wherein the conduit is fixedly connected to the manifold after sequentially passing through the first through hole and the third through hole.

4. The cell housing of claim 3, wherein the manifold is further provided with a fixing member fixedly provided at one end of the conduit sequentially penetrating the first through hole and the third through hole to fix the conduit to the manifold.

5. The cell casing according to claim 4, wherein a gasket is provided on the first through hole and/or the third through hole; the gasket is provided with a first groove that accommodates the manifold.

6. The cell casing according to claim 3, wherein the cell casing is further provided with a mounting member, the mounting member includes a first mounting block and a second mounting block that can be covered, a second groove for accommodating the manifold is provided between the first mounting block and the second mounting block, and the conduit is locked and fixed by a fixing member after passing through the first mounting block, the manifold, and the second mounting block in sequence.

7. The cell housing of claim 4, wherein the fastener is a nut and the conduit is provided with threads on one end that mate with the nut.

8. The cell housing of claim 1, wherein the conduit is disposed at a bottom of the cell housing.

9. A battery cell comprising a plurality of battery cell housings according to any one of claims 1-8.

10. A high capacity battery comprising a cell stack of cells according to claim 9.

11. The high capacity battery as recited in claim 10, wherein said cell housing houses a soft pack cell; when a plurality of electric cores are connected to form an electric core group, a collecting pipe on the electric core shell is connected to form an explosion venting channel of the electric core group, and at least one end of the explosion venting channel is provided with a thermal runaway flue gas outlet; or (b)

An electrode assembly is placed in the battery cell shell; when a plurality of electric cores are connected to form an electric core group, a sealing sheet is arranged in the guide pipe to seal the guide pipe, and the sealing sheet is dissolved when meeting electrolyte or is opened under the action of external force; the collecting pipe on the cell shell is connected to form an electrolyte sharing pipeline of the cell group so that electrolyte can circulate among the cells; the electrolyte sharing pipeline is also provided with an explosion venting component.

12. The high capacity battery as claimed in claim 11, wherein the explosion venting assembly is provided with a detachable port for injecting an electrolyte.

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