CN218300138U

CN218300138U - Bus structure, battery module and power battery package

Info

Publication number: CN218300138U
Application number: CN202221807905.6U
Authority: CN
Inventors: 许炳; 吴启泉; 许俊海
Original assignee: GAC Aion New Energy Automobile Co Ltd
Current assignee: GAC Aion New Energy Automobile Co Ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2023-01-13
Anticipated expiration: 2032-07-13

Abstract

The application provides a busbar structure, battery module and power battery package relates to power battery technical field. The busbar structure is used for gathering the free information of battery, and the busbar structure includes: the bus bar mechanism is provided with a first bus bar and a second bus bar which are arranged at intervals; and the fusing mechanism is provided with a fusing part which is respectively connected with the first bus bar and the second bus bar and is used for communicating the first bus bar with the second bus bar. The bus bar mechanism is provided with a first bus bar and a second bus bar which are arranged at intervals, the fusing part is respectively connected with the first bus bar and the second bus bar so as to realize the conduction between the first bus bar and the second bus bar, when the first bus bar and the second bus bar are respectively connected with the battery monomer, the first bus bar and the second bus bar can be protected through the fusing mechanism, and when the critical condition is reached, the fusing mechanism is fused by itself to realize the disconnection of the first bus bar and the second bus bar, and further the reliability and the safety of the product are improved.

Description

Bus structure, battery module and power battery package

Technical Field

The application relates to the technical field of power batteries, in particular to a bus bar structure, a battery module and a power battery pack.

Background

Energy conservation and emission reduction are the key of sustainable development of the automobile industry, the electric vehicle becomes an important component of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection, and for the electric vehicle, the battery technology is an important factor related to the development of the electric vehicle.

In addition to improving the energy density of the battery, the safety of the battery is a considerable problem in the development of battery technology. Therefore, how to improve the safety of the battery is an urgent problem to be solved in the battery technology.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a busbar structure, battery module and power battery package can realize high temperature and independently fusing to improve the reliability and the security of product.

In order to achieve the purpose, the following technical scheme is adopted in the application:

in a first aspect, the present application provides a bus bar structure for collecting information of battery cells, the bus bar structure including: the bus bar mechanism is provided with a first bus bar and a second bus bar which are arranged at intervals; a fusing mechanism having a fusing portion configured to be connected with the first bus bar and the second bus bar, respectively, for communication of the first bus bar and the second bus bar.

In the implementation process, the bus bar mechanism is provided with a first bus bar and a second bus bar which are arranged at intervals, the fusing mechanism is provided with a fusing part, the fusing part is respectively connected with the first bus bar and the second bus bar so as to realize the conduction between the first bus bar and the second bus bar, when the first bus bar and the second bus bar are respectively connected with the battery monomer, the first bus bar and the second bus bar can be protected through the fusing mechanism, and when the critical condition is reached, the fusing mechanism is fused by itself, the disconnection between the first bus bar and the second bus bar is realized, and further, the reliability and the safety of the product are improved.

In some embodiments, the fusing mechanism includes a fuse crimped to the first and second busbars, respectively.

At the in-process of above-mentioned realization, the fuse-link is used for switching on first busbar and second busbar, and when the fuse-link was in abominable operating mode, the fuse-link can independently be fused, can reduce the incidence that the secondary thermal runaway, has improved the security of product greatly.

In some embodiments, the fuse mechanism further includes a housing assembly having a receiving cavity, the fuse being disposed within the receiving cavity, and the receiving cavity being configured to receive at least a portion of the first busbar and to receive at least a portion of the second busbar.

In the process of above-mentioned realization, the fuse-link sets up in the intracavity that holds of casing subassembly, and holds the intracavity and be used for holding the structure of at least partly of first busbar and second busbar, can guarantee fuse-link, first busbar and second busbar three operational environment's stability through casing subassembly, reduces the probability that accident took place in its working process, avoids other parts to the influence that causes that these three connect.

In some embodiments, the outer surface of the housing assembly is protruded from the outer surface of the bus bar mechanism, so that the contact area between the bus bar mechanism and the battery cell can be reduced, and the influence of working conditions on the performance of the battery cell can be reduced.

In some embodiments, the housing assembly includes a first housing and a second housing, the first housing is disposed on one side of the bus bar structure, the second housing is disposed on the other side of the bus bar structure, and the first housing and the second housing are fixedly connected to form a protection for the fuse, the first bus bar and the second bus bar, so as to prevent other components from affecting the fuse.

In some embodiments, an infusion port is disposed on the housing assembly, and the infusion port is configured to communicate with the accommodating cavity for infusing a protective material into the accommodating cavity, so that arc extinguishing protection can be performed through the protective material, and the safety performance of the product is improved.

In some embodiments, one side of the first bus bar is concavely arranged to form a first avoidance groove, and the first avoidance groove is configured to be used for avoiding the fusing part, so that the overall structure of a product can be more compact, the cost is saved, and meanwhile, the connection stability of the fusing part and the first bus bar is also improved.

In some embodiments, one side of the second bus bar is recessed to form a second avoidance groove, and the second avoidance groove is configured to be used for avoiding the fusing part, so that the overall structure of the product is more compact, the cost is saved, and the stability of connection between the fusing part and the second bus bar is improved.

In a second aspect, the present application further provides a battery module, including: a plurality of battery cells having electrode terminals; and the bus bar structure according to any one of the above, the first bus bar and the second bus bar of the bus bar structure being configured to be connected to the electrode terminals, respectively.

At the in-process of above-mentioned realization, the battery monomer is provided with motor terminal, and first busbar and second busbar all are connected with electrode terminal, can gather the free information of battery, and when the operating mode temperature of battery module reached critical condition, the busbar structure can independently fuse to the high-pressure connection between the disconnection battery module improves the security of product.

In a third aspect, the application further provides a power battery pack, which includes the battery module.

The power battery pack provided in the third aspect of the present application includes the battery module described in the second aspect of the present disclosure, so that all technical effects of the foregoing embodiments are achieved, and details are not repeated herein.

Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for a user of ordinary skill in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a bus bar structure disclosed in an embodiment of the present application.

Fig. 2 is an exploded schematic view of a bus bar structure disclosed in an embodiment of the present application.

Reference numerals

100. A bus structure; 101. a bus bar mechanism; 1011. a first bus bar; 1012. a second bus bar; 102. a fusing mechanism; 1021. a first housing; 1022. a second housing; 1023. a fuse; 1024. and (4) filling the infusion port.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a user of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case to a user of ordinary skill in the art.

Examples

At the present stage, on the basis of the consideration of technology, process maturity and processing cost, the mainstream new energy automobiles at home and abroad adopt a scheme based on hard copper bars to carry out the electrical connection between modules; the common bus bar structure has the following advantages: (1) The technology has higher maturity, and the structure is basically selected at home and abroad; (2) the process is relatively simple and reliable: the bus bar is punched by a die, and the insulating skin of the bus bar is subjected to processes such as plastic dipping and the like, so that the bus bar is relatively mature and reliable.

The inventor discovers at the in-process of design, the electrical property of bus bar commonly used is that the characteristic condition of synthesizing the battery package carries out analog computation, judge the lectotype with results such as rack verification, after structural modeling design freezes, the bus bar can satisfy the electrical property (high pressure resistant, resistant current, it is insulating) of battery package, but can't realize high temperature fusing, when meetting thermal runaway, during abominable operating mode such as relay adhesion, the fuse has not reached fusing boundary condition yet this moment, bus bar between the module is still connected, high-temperature gas can burn the insulating skin of bus bar, will lead to high-voltage breakdown when that, form secondary thermal runaway outbreak, can directly influence the safety of next module, aggravate new energy source car thermal runaway outbreak.

In view of this, as shown in fig. 1-2, in a first aspect, the present application provides a bus bar structure 100, where the bus bar structure 100 is used for collecting information of battery cells, and the bus bar structure 100 includes: a bus mechanism 101 having a first bus 1011 and a second bus 1012 arranged at an interval; a fuse mechanism 102 having a fuse portion configured to be connected to the first bus 1011 and the second bus 1012, respectively, for communication of the first bus 1011 and the second bus 1012.

For example, the first bus bar 1011 and the second bus bar 1012 can be made of metal material such as copper, and the distance and shape between the first bus bar 1011 and the second bus bar 1012 are not particularly limited, and can be set according to actual situations, which are not described herein.

In the implementation process, the bus bar mechanism 101 has the first bus bar 1011 and the second bus bar 1012 arranged at an interval, the fuse mechanism 102 has a fuse portion, and the fuse portion is connected with the first bus bar 1011 and the second bus bar 1012 respectively to realize the conduction between the first bus bar 1011 and the second bus bar 1012, so that when the first bus bar 1011 and the second bus bar 1012 are connected with the battery cell respectively, the protection can be performed through the fuse mechanism 102, and when a critical condition is reached, the fuse mechanism 102 fuses by itself, the disconnection between the first bus bar 1011 and the second bus bar 1012 is realized, and further, the reliability and the safety of the product are improved.

As shown in fig. 2, the fuse mechanism 102 includes a fuse 1023, and the fuse 1023 is pressed against the first bus 1011 and the second bus 1012 respectively. For example, the fuse 1023 may be a pure tin plate or a high temperature fusing material, and the fuse 1023 may be connected to the first bus 1011 and the second bus 1012 by laser welding or bolt fastening, and the fusing critical temperature of the fuse 1023 includes, but is not limited to, 240 ℃, so as to prevent the fuse mechanism 102 from being broken down by high voltage.

In the process of above-mentioned realization, fuse 1023 is used for switching on first busbar 1011 and second busbar 1012, and when fuse 1023 is in abominable operating mode, fuse 1023 can independently fuse, can reduce the incidence of secondary thermal runaway, has improved the security of product greatly.

Referring to fig. 1 or 2, the fuse mechanism 102 further includes a housing assembly having a receiving cavity, the fuse 1023 is disposed in the receiving cavity, and the receiving cavity is configured to receive at least a portion of the first bus 1011 and at least a portion of the second bus 1012; wherein in order to guarantee good insulating nature, housing assembly adopts the plastic casing, housing assembly has high temperature resistant characteristic, and critical temperature is greater than fuse 1023's fusing critical temperature, for example housing assembly can be able to bear or endure 300 ℃ high temperature etc..

In the in-process of above-mentioned realization, fuse 1023 sets up in housing assembly's the intracavity that holds, and holds the intracavity and be used for holding the partly structure of at least of first busbar 1011 and second busbar 1012, can guarantee fuse 1023, first busbar 1011 and second busbar 1012 three operational environment's stability through housing assembly, reduces the probability of occurence of failure in its course of operation, avoids other parts to the influence that causes that this three connects.

In some embodiments, the outer surface of the housing assembly is protruded from the outer surface of the bus bar mechanism 101, so that the contact area between the bus bar mechanism 101 and the battery cell can be reduced, and the influence of the working condition on the performance of the battery cell can be reduced.

Referring to fig. 2 again, the housing assembly includes a first housing 1021 and a second housing 1022, the first housing 1021 is disposed at one side of the bus bar structure 100, the second housing 1022 is disposed at the other side of the bus bar structure 100, and the first housing 1021 and the second housing 1022 are fixedly connected; the first casing 1021 and the second casing 1022 can be fixed by bolts, and the connection among the fuse 1023, the first bus 1011 and the second bus 1012 can be wrapped and sealed to form protection, so that other parts are prevented from affecting the fuse.

In some embodiments, an infusion port 1024 is disposed on the housing assembly, and the infusion port 1024 is configured to communicate with the receiving cavity for infusing a protective material into the receiving cavity, wherein the protective material includes but is not limited to quartz sand, and arc extinguishing protection (similar to high-voltage relay protection in principle) can be performed through the protective material, so that the safety performance of the product is improved.

In some embodiments, one side of the first bus bar 1011 is concavely arranged to form a first avoidance groove, and the first avoidance groove is configured to be used for avoiding the fusing part, so that the overall structure of the product can be more compact, the cost is saved, and the connection stability between the fusing part and the first bus bar 1011 is also improved.

In some embodiments, one side of the second bus bar 1012 is recessed to form a second avoiding groove, and the second avoiding groove is configured to avoid the fusing part, so that the overall structure of the product is more compact, the cost is saved, and the connection stability between the fusing part and the second bus bar 1012 is also improved.

In a second aspect, the present application further provides a battery module, including: a plurality of battery cells having electrode terminals; and the bus bar structure 100 as described in any of the above, the first bus bar 1011 and the second bus bar 1012 of the bus bar structure 100 are configured to be connected to the electrode terminals, respectively; the first bus 1011 and the second bus 1012 are connected to different electrode terminals for collecting information of the battery cells, such as voltage and temperature.

At the in-process of above-mentioned realization, the battery monomer is provided with the motor terminal, and first busbar 1011 and second busbar 1012 all are connected with electrode terminals, can gather the free information of battery, and when the operating mode temperature of battery module reached the critical condition, busbar structure 100 can independently fuse to the high-pressure connection between the disconnection battery module improves the security of product.

In a third aspect, the application further provides a power battery pack, which includes the battery module. Exemplarily, the power battery pack further comprises a battery box body, and the battery module can be provided with a plurality of battery modules arranged in the battery box body.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bus structure for collecting information of battery cells, the bus structure comprising:

the bus bar mechanism is provided with a first bus bar and a second bus bar which are arranged at intervals;

a fusing mechanism having a fusing portion configured to be connected with the first bus bar and the second bus bar, respectively, for communication of the first bus bar and the second bus bar.

2. The bus bar structure of claim 1, wherein the fusing mechanism includes a fuse that is crimped to the first bus bar and the second bus bar, respectively.

3. The bus bar structure of claim 2, wherein the fuse mechanism further comprises a housing assembly having a receiving cavity, the fuse being disposed within the receiving cavity, and the receiving cavity being configured to receive the structure of at least a portion of the first bus bar and the structure of at least a portion of the second bus bar.

4. The bus bar structure of claim 3, wherein an outer surface of the housing assembly is raised above an outer surface of the bus bar mechanism.

5. The bus bar structure of claim 3, wherein the housing assembly comprises a first housing and a second housing, the first housing is disposed on one side of the bus bar structure, the second housing is disposed on the other side of the bus bar structure, and the first housing and the second housing are fixedly connected.

6. The buss bar structure of claim 3, wherein an infusion port is provided on the housing assembly, the infusion port configured to communicate with the receiving cavity for infusing a protective material into the receiving cavity.

7. The busbar structure according to claim 1, wherein one side of the first busbar is recessed to form a first avoidance groove configured for avoidance of the fusing part.

8. The busbar structure according to claim 1 or 7, wherein one side of the second busbar is recessed to form a second escape groove configured for escape of the fusing portion.

9. A battery module, comprising:

a plurality of battery cells having electrode terminals; and

the busbar structure according to any one of claims 1 to 8, the first busbar and the second busbar of the busbar structure being configured to be connected to the electrode terminals, respectively.

10. A power battery pack comprising the battery module according to claim 9.