CN219937310U

CN219937310U - Battery pack with fire extinguishing function

Info

Publication number: CN219937310U
Application number: CN202321588787.9U
Authority: CN
Inventors: 张学荣
Original assignee: Shanghai Paizhi Energy Co ltd
Current assignee: Shanghai Paizhi Energy Co ltd
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-10-31
Anticipated expiration: 2033-06-21

Abstract

The utility model discloses a battery pack with a fire extinguishing function. The fire extinguishing device comprises a battery pack, a confluence sheet, a connecting sheet and a fire extinguishing piece, wherein the battery pack comprises a plurality of battery cores which are arranged in series-parallel; the surface of the bus plate is provided with a mounting through hole corresponding to the battery core electrode post; the connecting sheet is fixedly connected to the bus bar and is welded and connected to the battery core electrode post; the fire extinguishing member is fixedly arranged in the installation through hole. In the battery pack with the fire extinguishing function, after the connecting sheet is welded with the battery core pole, the fire extinguishing piece can be placed in the mounting through hole of the bus bar without influencing the welding process of the connecting sheet and the battery core pole; in addition, when the electricity core takes place to generate heat or fire the condition, because the installation through-hole corresponds to set up in electric core utmost point post, the piece of putting out a fire can be responded fast and electric core utmost point post is put out a fire to make the electricity core in time cool down, greatly reduced the probability that the electricity core produced the incident.

Description

Battery pack with fire extinguishing function

Technical Field

The utility model belongs to the technical field of battery fire extinguishment, and particularly relates to a battery pack with a fire extinguishment function.

Background

In electric products such as electric motorcycles and electric automobiles, the characteristics of strong starting, rapid acceleration and long endurance time are required, so that a high-rate and high-capacity power type battery is generally required, and in this case, the battery releases high heat to cause a high-temperature alarm of a BMS (i.e. a battery management system), so that the vehicle cannot be used normally, and safety accidents occur due to the high temperature.

In view of the above, the chinese patent application No. 202080099037.8 provides a battery pack including a fire extinguishing film including a microcapsule for extinguishing a fire, wherein the fire extinguishing film is disposed in a predetermined space in a battery case, and when the battery abnormally heats or a fire occurs, the film is actively ruptured to release an internal fire extinguishing agent, thereby extinguishing the fire. However, when the fire extinguishing film is assembled, the following problems still remain:

1. when the fire extinguishing film is arranged on the surface of the pole, the welding connection between the bus plate and the battery pole is blocked, so that the welding difficulty is increased;

2. when setting up the fire extinguishing film between adjacent electric core, because the electric core is generally at the temperature of utmost point post surface highest when generating heat, therefore this fire extinguishing film can't be fast effectively to generating heat or the electric core of getting on fire cooling, the probability that leads to the incident to take place still is higher.

Based on the foregoing, there is a need for a battery pack with fire extinguishing function to solve the technical problems in the prior art.

Disclosure of Invention

The utility model aims to provide a battery pack with a fire extinguishing function, which does not influence the welding connection between a bus plate and a battery core pole, can quickly and effectively cool a battery core which heats or fires, and reduces the probability of safety accidents.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery pack having a fire extinguishing function, comprising:

the battery pack comprises a plurality of battery cores which are arranged in series-parallel connection;

the surface of the bus plate is provided with an installation through hole corresponding to the battery core pole of the battery core;

the connecting piece is fixedly connected to the bus piece and is welded to the battery core electrode post;

the fire extinguishing piece is fixedly arranged in the installation through hole.

Optionally, the fire extinguishing member is a fire extinguishing capsule, and the fire extinguishing capsule comprises a shell and a fire extinguishing agent arranged in the shell, wherein the fire extinguishing member is configured such that the shell can be melted in a preset temperature range, so that the fire extinguishing agent can be injected to the battery core pole.

Optionally, the shell is made of polyurea-polyester material, and the fire extinguishing agent is perfluoro-hexanone fire extinguishing agent.

Optionally, a double faced adhesive tape or an adhesive is arranged on the surface of the fire extinguishing piece facing the electric core pole;

and/or, the battery pack further comprises an epoxy plate, the surface of the epoxy plate facing the battery core electrode column is provided with the double-sided tape or the adhesive, the epoxy plate is covered and adhered to the bus sheet, and the fire extinguishing member is clamped between the epoxy plate and the connecting sheet.

Optionally, the electric core pole comprises a positive pole and a negative pole, the busbar comprises a positive busbar and a negative busbar, the connecting piece comprises a positive connecting piece and a negative connecting piece, the positive connecting piece is fixedly connected with the positive busbar, the positive connecting piece is welded and connected with the positive pole, the negative connecting piece is fixedly connected with the negative busbar, the negative connecting piece is welded and connected with the negative pole, and at least one of the positive connecting piece and the negative connecting piece is fixedly connected with the fire extinguishing piece.

Optionally, the positive connection piece is fixedly connected with the fire extinguishing piece.

Optionally, the battery pack comprises multiple layers of electric cores which are arranged in parallel, and only one layer of the adjacent two layers of electric cores is provided with the fire extinguishing member.

Optionally, the cross-sectional shape of the fire extinguishing member is circular or square.

Optionally, the battery pack further comprises a pair of battery brackets arranged at two ends of the battery core at intervals, a plurality of limiting mounting holes corresponding to the mounting through holes are formed in the battery brackets, and two ends of each battery core are inserted in the corresponding limiting mounting holes in a one-to-one correspondence mode and are abutted to the connecting pieces.

Optionally, a liquid cooling plate is sandwiched between two adjacent electric cores.

Compared with the prior art, the utility model has the beneficial effects that:

in the battery pack with the fire extinguishing function, after the connecting sheet is welded with the battery core pole, the fire extinguishing piece can be placed in the mounting through hole of the bus bar without influencing the welding process of the connecting sheet and the battery core pole; in addition, when the electricity core takes place to generate heat or fire the condition, because the installation through-hole corresponds to set up in electric core utmost point post, the piece of putting out a fire can be responded fast and electric core utmost point post is put out a fire to make the electricity core in time cool down, greatly reduced the probability that the electricity core produced the incident.

Drawings

Fig. 1 is a schematic diagram of the internal structure of a battery pack with fire extinguishing function provided by the utility model after the outer shell is removed;

FIG. 2 is an exploded view of a part of the structure of the battery pack with fire extinguishing function after the outer shell is removed;

fig. 3 is a schematic view of the internal structure of the battery pack with fire extinguishing function provided by the utility model after the outer shell and the epoxy plate are hidden;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

fig. 5 is a schematic diagram of the installation between the cell and the liquid cooling plate in the present utility model.

In the figure:

1. a battery pack; 11. a battery cell; 111. a positive electrode post; 20. mounting through holes; 21. positive confluence sheet; 31. a positive connection piece; 4. a fire extinguishing member; 5. an epoxy board; 6. a battery holder; 61. limiting the mounting hole; 7. and a liquid cooling plate.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to be within the scope of the present utility model.

The battery pack having the fire extinguishing function is described below with reference to fig. 1 to 5 and the embodiment. Optionally, the battery pack can be applied to an electric motorcycle, and the battery can release high heat at the moment because the electric motorcycle can have the conditions of strong starting, rapid acceleration and long endurance time when in actual use; the battery pack provided by the embodiment can prevent thermal runaway caused by high heat spreading generated by the battery, and has the function of extinguishing fire and reducing temperature, so that the safety of the use process of the electric motorcycle is ensured. Of course, the battery pack in the embodiment is not limited to the electric motorcycle, and can be used on electric products such as electric automobiles and electric tricycles, so that the battery pack has high practical use value.

As shown in fig. 1 to 3, the battery pack includes a battery pack 1, a bus bar, a connection sheet, and a fire extinguishing member 4. The battery pack 1 comprises a plurality of battery cells 11 which are arranged in series-parallel connection; the surface of the bus bar is provided with a mounting through hole 20, and the mounting through hole 20 is correspondingly arranged with a battery core pole of the battery core 11; the connecting sheet is fixedly connected to the bus bar and welded to the battery core electrode post, and is preferably a nickel sheet, and the nickel sheet has good conductivity, good stability and low economic cost; after the connecting sheet is welded with the electric core pole, the fire extinguishing member 4 is fixedly arranged in the installation through hole 20, so that the fire extinguishing member 4 is installed on the bus bar, and the welding process of the connecting sheet and the electric core pole is not affected in the installation process. In addition, when the electric core 11 generates heat or fires, because the installation through hole 20 corresponds to be set up in electric core utmost point post for the fire extinguishing member 4 can respond fast and put out a fire to electric core utmost point post, thereby make electric core 11 can in time cool down, greatly reduced electric core 11 and produced the probability of incident.

Alternatively, in the present embodiment, the number of the battery packs 1 is two, and the two battery packs 1 are arranged in parallel (i.e. along the direction indicated by the Y axis in fig. 3), and a plurality of battery cells 11 are respectively arranged in series and parallel along the X axis direction and the Z axis direction in fig. 3. For example, 10 electric cores 11 are distributed in a serpentine manner in the X-axis direction, so that the number of the electric cores 11 in the X-axis direction can be effectively increased; and 10 electric cores 11 are arranged along a straight line in the Z-axis direction, so that each battery pack comprises 100 electric cores 11, and the requirement of larger battery capacity required by the electric motorcycle can be met. Correspondingly, the number of the bus plates is multiple, and the cross section of each bus plate is also in a snake shape, so that each electric core 11 arranged along the X-axis direction can be fully contacted with the bus plate, and the electric quantity utilization rate is improved.

Specifically, as shown in fig. 2 and 3, the cell post includes a positive post 111 and a negative post (not shown in the figure), the busbar includes a positive busbar 21 and a negative busbar (not shown in the figure), the positive busbar 21 is fixedly connected with a positive connecting piece 31, and the positive connecting piece 31 is welded and connected to the positive post 111; the negative bus plate is fixedly connected with a negative connecting plate (not shown in the figure), and the negative connecting plate is welded and connected with the negative pole column. In this embodiment, the positive connection piece 31 is fixedly connected with the fire extinguishing member 4, and in general, the material adopted in the production of the negative electrode column is generally carbon or graphite with better fire resistance, so that the negative electrode column is not easy to generate heat and fire; the materials used in the production of the positive electrode post 111 are generally oxide materials, such as ternary materials, lithium cobaltate, etc., which are easy to ignite at high temperature and have poor fire resistance. Therefore, by fixedly connecting the fire extinguishing member 4 described above to the positive connection piece 31, the fire of the battery cell 11 can be effectively prevented.

In some parallel embodiments, in order to prevent the fire caused by the ignition of the electrolyte from the negative electrode terminal side when an abnormal condition such as a short circuit occurs at the negative electrode terminal of the battery cell 11, the fire extinguishing member 4 may be disposed in the mounting through hole 20 of the negative bus bar, so as to further improve the safety performance of the battery cell 11.

Further, referring to fig. 3, in this embodiment, in two adjacent layers of the cells 11 along the direction indicated by the Z-axis in fig. 3, only one layer of the cells 11 is provided with the fire extinguishing member 4. When the fire extinguishing member 4 is arranged on each layer of the battery core 11, the production and manufacturing cost and the assembly time of the battery pack can be obviously increased, and the electrical performance of the battery pack 1 can be influenced to a certain extent by excessive fire extinguishing agents, so that the fire extinguishing member 4 is arranged on one layer and the fire extinguishing member 4 is not arranged on the other layer, the production cost can be controlled on one hand, and the influence on the electrical performance of the battery pack 1 can be reduced as much as possible on the premise of ensuring the safety on the other hand. It will be appreciated that the number of fire extinguishing members 4 to be provided may be comprehensively considered and selected by those skilled in the art according to the type of fire extinguishing members 4 selected, the specific use scenario and the requirements, and the present utility model is not limited thereto.

Optionally, the fire extinguishing member 4 is a fire extinguishing capsule, which can achieve a more efficient, more accurate and safer fire extinguishing effect. The fire extinguishing member 4 comprises a shell and a fire extinguishing agent arranged in the shell, wherein the shell is used for being melted and broken when the temperature of the battery cell pole reaches the preset temperature range where the battery cell pole melts, so that the fire extinguishing agent in the shell can be released to the battery cell pole to cool and extinguish the fire. Illustratively, the housing provided in this example is injection molded from a polyurea-polyester material, and after the housing is molded, an injection device is used to add an appropriate amount of perfluorohexanone to the cavity within the housing to compress the perfluorohexanone within the polyurea-polyester material; then, the molded fire extinguishing member 4 is subjected to shape cutting processing according to the sectional shape of the installation through hole 20 so as to be the same as the sectional shape and the same size of the installation through hole 20. Thus, when the positive electrode column 111 is subjected to thermal runaway fire and the temperature reaches 80-120 ℃, the shell is melted, so that the perfluorohexanone compressed in the inner cavity is released, the perfluorohexanone is a fluorocarbon compound with fire extinguishing performance, and when the perfluorohexanone contacts with flame, a large amount of heat is absorbed, so that the ambient temperature is reduced, and the fire extinguishing effect on the battery cell 11 subjected to the thermal runaway fire can be achieved.

It should be noted that the present utility model does not limit the type of the shell of the fire extinguishing member 4 and the material of the fire extinguishing agent, and the set temperature range is within the thermal runaway temperature range of the battery 11, and the fire extinguishing agent has safety and stability, so long as the shell can be melted in the set temperature range, which is within the protection scope of the present utility model.

Further, the battery cell 11 in this embodiment is a cylindrical battery cell, and accordingly, the shape of the mounting through hole 20 on the busbar, the shape of the connecting piece, and the shape of the fire extinguishing member 4 are all designed to be circular, so as to facilitate mounting and fixing. Of course, in some parallel embodiments, when the battery cell 11 is a square battery cell, the shape of the mounting through hole 20 on the busbar, the shape of the connecting sheet and the shape of the fire extinguishing member 4 are designed to be square correspondingly, so that a person skilled in the art can process and manufacture the fire extinguishing member 4 correspondingly according to the shape of the battery cell 11 adopted under actual working conditions, and the application range of the fire extinguishing member 4 is effectively widened.

After the fire extinguishing member 4 is processed into a shape matching the cross section of the cell post, the fire extinguishing member 4 needs to be fixedly disposed in the mounting through hole 20. Optionally, the battery pack provided in this embodiment further includes an epoxy board 5, where the epoxy board 5 is attached to the outer side of the battery pack 1, so that the battery pack 1 can be prevented from being physically damaged by the outside. In this embodiment, the surface of the epoxy plate 5 facing the positive pole 111 is provided with a double faced adhesive tape or an adhesive, the epoxy plate 5 is covered and adhered to the busbar, and the fire extinguishing member 4 is clamped between the epoxy plate 5 and the connecting sheet, so that the fire extinguishing member 4 is limited and fixed in the mounting through hole 20, shaking of the fire extinguishing member is prevented, and the safety of the battery pack in use is improved.

In some parallel embodiments, a double-sided adhesive tape or an adhesive may be additionally disposed on the surface of the fire extinguishing member 4 facing the positive pole 111, and after the fire extinguishing member 4 is tightly attached to the positive connecting piece 31 through the mounting through hole 20, the epoxy plate 5 is attached to the bus plate, so as to further improve the mounting stability of the fire extinguishing member 4, so that the fire extinguishing member 4 can be attached to the positive connecting piece 31 welded to the positive pole 111, and the fire extinguishing member is stable and firm in fixation.

It should be noted that, as shown in fig. 4, in this embodiment, two parallel battery packs are fixedly connected by using the same epoxy plate 5, and two opposite sides of the epoxy plate 5 are respectively provided with a double sided adhesive tape or an adhesive, so as to complete the fixed connection of the two battery packs.

Specifically, as shown in fig. 1 and 2, the battery pack provided in this embodiment further includes a pair of battery holders 6 disposed at two ends of the battery core 11 at intervals, the battery holders 6 are made of an insulating material, and a plurality of limit mounting holes 61 disposed corresponding to the mounting through holes 20 are formed in the battery holders 6. During specific installation, firstly, two ends of the battery core 11 are respectively inserted into the limit mounting holes 61 in a one-to-one correspondence manner, then the positive bus plate 21 with the positive connecting plates 31 is attached to the battery bracket 6, so that the positive connecting plates 31 can be abutted against the positive pole 111 in the limit mounting holes 61, then an operator uses a laser welding mode to weld the positive connecting plates 31 to the positive pole 111, then a plurality of fire extinguishing pieces 4 are placed in the plurality of mounting through holes 20, and the epoxy plates 5 are attached to and covered on the positive bus plate 21, so that the fire extinguishing pieces 4 are stably clamped between the positive connecting plates 31 and the epoxy plates 5, and thus, the assembly process of a part structure of the side of the positive pole 111 is completed. It can be understood that the assembly process of the battery holder 6, the bus bar and the epoxy plate 5 on the negative electrode post side is the same as the assembly process of the battery holder 6, the bus bar and the epoxy plate 5 on the positive electrode post 111, and the description thereof is omitted.

Optionally, in this embodiment, as shown in fig. 3 and fig. 5, each of the electric cores 11 along the X-axis direction is arranged according to a serpentine shape, so that each of the electric cores 11 in the row is arranged in a staggered manner in the Z-axis direction, and the liquid cooling plate 7 is sandwiched between two adjacent electric cores 11, and the cross-sectional shape of the liquid cooling plate 7 is wavy, so that the outer surface of the liquid cooling plate 7 can be tightly attached to the surface of the electric core 11, and when the electric core 11 is out of control, the cooling medium flowing in the liquid cooling plate 7 can cool down the electric core 11, thereby further reducing the occurrence of the battery pack safety accident.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. Battery package with function of putting out a fire, its characterized in that includes:

the battery pack (1), the battery pack (1) comprises a plurality of battery cells (11) which are arranged in series-parallel connection;

the surface of the bus plate is provided with a mounting through hole (20) corresponding to the battery cell pole of the battery cell (11);

the fire extinguishing member (4), the fire extinguishing member (4) is fixedly arranged in the installation through hole (20).

2. The battery pack with fire extinguishing function according to claim 1, wherein the fire extinguishing member (4) is a fire extinguishing capsule comprising a housing and a fire extinguishing agent provided in the housing, the fire extinguishing member (4) being configured such that the housing can be melted within a preset temperature range so that the fire extinguishing agent can be injected to the battery post.

3. The battery pack with fire extinguishing function according to claim 2, wherein the housing is made of polyurea-polyester material, and the fire extinguishing agent is perfluoro-hexanone fire extinguishing agent.

4. A battery pack with fire extinguishing function according to any one of claims 1-3, characterized in that the surface of the fire extinguishing member (4) facing the cell pole is provided with double sided tape or adhesive;

and/or, the battery pack further comprises an epoxy plate (5), the surface of the epoxy plate (5) facing the battery core polar column is provided with the double-sided tape or the adhesive, the epoxy plate (5) is covered and adhered to the bus sheet, and the fire extinguishing piece (4) is clamped between the epoxy plate (5) and the connecting sheet.

5. The battery pack with fire extinguishing function according to claim 1, wherein the battery cell post comprises a positive post (111) and a negative post, the busbar comprises a positive busbar (21) and a negative busbar, the connecting pieces comprise a positive connecting piece (31) and a negative connecting piece, the positive connecting piece (31) is fixedly connected to the positive busbar (111) through welding, the negative connecting piece is fixedly connected to the negative busbar through welding, and at least one of the positive connecting piece (31) and the negative connecting piece is fixedly connected to the fire extinguishing piece (4).

6. The battery pack with the fire extinguishing function according to claim 5, wherein the positive connection piece (31) is fixedly connected with the fire extinguishing member (4).

7. The battery pack with the fire extinguishing function according to claim 6, wherein the battery pack (1) comprises a plurality of layers of the electric cores (11) which are arranged in parallel, and only one layer of the adjacent two layers of the electric cores (11) is provided with the fire extinguishing member (4).

8. The battery pack with fire extinguishing function according to claim 1, characterized in that the cross-sectional shape of the fire extinguishing member (4) is circular or square.

9. The battery pack with the fire extinguishing function according to claim 1, further comprising a pair of battery brackets (6) arranged at two ends of the battery cell (11) at intervals, wherein a plurality of limit mounting holes (61) which are arranged corresponding to the mounting through holes (20) are formed in the battery brackets (6), and two ends of each battery cell (11) are inserted into the limit mounting holes (61) in a one-to-one correspondence manner and are abutted against the connecting sheets.

10. The battery pack with the fire extinguishing function according to claim 1, wherein a liquid cooling plate (7) is sandwiched between two adjacent electric cores (11).