TWI440244B - Battery system - Google Patents

Description

Battery system

The present invention relates to a battery system, and more particularly to a heat dissipation mechanism for a battery system.

In recent years, considering the increasing environmental pollution, batteries, which can be charged or discharged, are often used as power sources to replace traditional fossil fuels to solve the environmental pollution problems caused by fossil fuels. In the field of vehicle power, compared with traditional energy sources, electric power sources have obvious advantages in environmental protection. The use of batteries as a power source does not consume gasoline, no exhaust gas, low noise, and low radiation, which is an ideal power source. At present, the commonly used power source usually adopts a plurality of single cells to be placed in a battery module frame, and then the battery cells are electrically combined through a series-parallel module to form a battery module, thereby meeting the power demand.

At present, the circuit in the battery system generates a considerable amount of heat when working, especially the passive battery balancing circuit, which needs to make the excess energy in the battery into heat energy, so that a large amount of heat is generated inside the system. Heat builds up in the battery system housing, which can have a serious impact on the battery system, such as damage to the board. Therefore, how to effectively dissipate the heat in the battery system casing to the outside is an urgent problem to be solved by those skilled in the art.

The technical problem to be solved by the present invention is to provide a battery system that can effectively dissipate the heat energy generated by the battery balancing circuit board.

In order to solve the above technical problem, the present invention adopts the following technical solution: a battery system, the battery system includes: a battery assembly, including a frame, and a plurality of batteries disposed in the frame and electrically connected to each other; and a housing for housing the battery assembly; a cover body covering the casing; a heat sink fixed between the casing and the cover; and a battery balancing circuit board fixedly disposed on the heat sink, the battery balancing circuit board A battery balance control assembly is provided for dissipating excess electrical energy in the battery into thermal energy.

According to a further improvement of the present invention, the heat sink includes a metal piece, the metal piece is stamped with a protruding portion, and a receiving area is defined in the protruding portion, and the battery balancing circuit board is received in the receiving area.

As a further improvement of the present invention, the system further includes a battery management circuit board on which is disposed a battery management control element for monitoring battery voltage, current and temperature.

As a further improvement of the present invention, the aforementioned battery management control element includes an electronic switch, and the battery management control element is also used to implement battery protection by controlling the on and off of the electronic switch.

As a further improvement of the present invention, the aforementioned electronic switch comprises a field effect transistor.

As a further improvement of the present invention, the system further includes an insulating sheet disposed between the electronic switch and the aforementioned heat sink.

As a further improvement of the present invention, the projected area of the insulating sheet on the heat sink is larger than the projected area of the electronic switch on the heat sink to prevent electrical contact between the electronic switch and the heat sink.

According to a further improvement of the present invention, a heat dissipating oil is disposed between the electronic switch and the insulating sheet; and a heat dissipating oil is disposed between the heat sink and the insulating sheet.

As a further improvement of the present invention, the foregoing insulating sheet comprises silicone or mica sheets; and the aforementioned heat dissipating oil comprises a heat dissipating rouge.

As a further improvement of the present invention, the cover body is provided with an opening for receiving the protruding portion of the heat sink; and the battery system further includes a heat dissipation fin covering the opening.

Compared with the prior art, the utility model has the beneficial effects that the battery balancing circuit board is disposed on the heat sink, and the heat energy generated by the passive balancing circuit can be dissipated in time to ensure the normal operation of the battery system.

The present invention will be described in detail below in conjunction with the embodiments shown in the drawings. However, the embodiments are not intended to limit the invention, and the structures, methods, or functional changes made by those skilled in the art in accordance with the embodiments are included in the scope of the present invention.

In the embodiment shown in the first and second figures, the battery system 100 includes a battery assembly 20. The battery assembly 20 includes a frame, and a plurality of batteries 23 electrically connected to each other are disposed in the frame. The aforementioned battery 23 can be selectively configured in a plurality of specifications. The battery system 100 further includes a housing 10 that houses the battery assembly 20. The battery system 100 further includes a cover body 30 (shown in FIG. 5). The cover body 30 is covered on the housing 10 to ensure that the battery assembly 20 inside the battery system 100 is not affected by the outside and causes an electrical failure.

As shown in the first, second and third figures, the battery system 100 can be configured with the internal battery 23 in accordance with the shape and size of the housing 10. The foregoing specifications include the voltage and capacity of the battery 23 after being configured. Since the configuration of the battery 23 requires a plurality of batteries 23 to be electrically connected, it is required that each battery 23 in the same specification configuration has the same rated voltage and rated capacity, thereby ensuring the accuracy of the configuration.

The battery 23 is fixed in the frame. In the embodiment, the frame includes a top bracket 21 and a bottom bracket 22. The top bracket 21 and the bottom bracket 22 sandwich the battery 23 to constitute a battery pack. An adhesive such as glass glue or double-sided tape is also disposed between the frame and the battery to make the frame and the battery more closely fixed. The battery 23 has positive and negative electrodes, and the top bracket 21 is provided with a through hole for the electrodes of the battery to pass through. Portions of the aforementioned battery electrodes extending out of the top bracket 21 will be selectively connected in series or in parallel to meet the requirements of the battery specification configuration.

In this embodiment, the conductive members 24 integrally stamped and formed by a metal plate are used as a series and parallel structure between the batteries 23. It is only necessary to provide a through hole for the position of the electrode on the conductive member. After the conductive member 24 covers the corresponding electrode, the conductive member 24 is fixed to the top bracket 21 by the nut, thereby ensuring the battery 23, the top bracket 21 and the conductive member. 24 close combination between the three. The battery specifications in the battery system 100 are configured, including the adjustment of the number of the batteries 23 and the adjustment of the series and parallel structures between the batteries 23. After the adjustment of the two is implemented, the frame for the fixed battery 23 is adaptively designed. In this embodiment, only the top bracket 21 and the bottom are required. The battery receiving area and the electrode receiving hole on the bracket 22 can be adaptively adjusted to meet the requirements of the same housing 10, and the specifications of the battery 23 can be configured accordingly.

There are no special requirements for the rated voltage and rated capacity of the battery. Only the corresponding parameters between the batteries must be consistent to meet the modular requirements. In one embodiment, a battery having a rated voltage of 3 volts and a rated capacity of 12.5 amps is used, and the number of batteries is 24. The 24 batteries are connected in series to obtain the specifications of 72 volts and 12.5 ampere hours. Alternatively, as shown in the first figure, 24 batteries are connected in parallel and then connected in series to obtain a specification of 36 volts and 25 ampere hours.

In another embodiment, 16 batteries having a rated voltage of 3 volts and a rated capacity of 25 amps are used. The 16 batteries can be connected in series to obtain the specifications of 48 volts and 25 amp hours. It is also possible to connect each of the 16 batteries in parallel and then connect them in series to obtain the specifications of 24 volts and 50 ampere hours; or as shown in the second figure, Each of the 16 batteries is connected in parallel and then connected in series to obtain a specification of 12 volts and 100 ampere hours. Usually the specifications will be marked on the side of the battery pack housing 10 in the form of labels to indicate the specifications for convenient modular applications.

As shown in the third figure, in the present embodiment, the conductive member formed by integrally stamping and forming a metal plate is used to string and parallel the battery 23. The electrodes of the batteries in the same row are connected in series, and may be arranged as a long straight strip-shaped first conductive member 241. For the parallel connection of the electrodes of different rows of batteries, a plurality of rows of second conductive members 242 may be disposed. The aforementioned second conductive member 242 is used to connect two rows of batteries in series. In this embodiment, the second conductive member 242 is integrally formed by stamping.

As shown in the fourth and fifth figures, the housing 10 of the battery system 100 includes a bottom wall and side walls 11 extending upward from the peripheral side of the bottom wall to form a receiving cavity for receiving the battery assembly 20. The shape of the casing 10 can be designed according to the frame of the battery assembly 20, and the material thereof is made of an insulating material. In this embodiment, the housing 10 is provided in a cubic shape and is made of ABS plastic material. The cover 30 of the battery system 100 covers the upper portion of the casing 10, and the two are fixed by screws. The cover 30 is made of an insulating material to ensure insulation of the battery system. The cover body 30 is provided with a handhold 32 that is easy to open.

As shown in the sixth and first figures, the battery system 100 further includes a battery management circuit board 41. The battery management circuit board 41 is fixed to the frame and electrically connected to the battery 23. Wherein the aforementioned battery management circuit board 41 is spaced apart from the top of the frame. In this embodiment, the frame includes a top bracket 21 and a bottom bracket 22, and the battery management circuit board 41 is fixed to the foregoing. The top bracket 21 is above and spaced from the top bracket 21.

An upright support column 211 is disposed between the battery management circuit board 41 and the frame, and the support column 211 is made of a long straight copper column. The battery management circuit board 41 supports the 211 support so as to be spaced apart from the top of the frame. The frame top portion 21 has a column 212, and the support column 211 and the column 212 are screwed. The aforementioned support post 211 is screwed into the aforementioned upright 212 so that the aforementioned support post 211 is fixed to the top of the aforementioned frame. The aforementioned battery management circuit board 41 also includes battery management control elements for monitoring battery voltage, current, and temperature. The foregoing battery management control component includes an electronic switch 411, and the battery management control component is further configured to implement protection of the battery by controlling the on and off of the electronic switch 411.

In this embodiment, a field effect transistor is employed as the electronic switch 411. The foregoing battery system 100 further includes a heat sink 42 disposed between the battery management circuit board 41 and the cover 30, and the heat sink 42 is made of aluminum or copper. The heat sink 42 is connected to the battery management circuit board 41 via a fixing post 213, and the support post 211 is longer than the aforementioned fixing post 213. The fixing post 213 and the support 211 are screwed, so that the battery management circuit board 41 is fixed between the support post 211 and the fixing post 213 to be stable.

As shown in the seventh, eighth and ninth diagrams, the battery system 100 further includes a battery balancing circuit board 43 which is a square printed circuit board that uses electrical resistors to convert excess electrical energy in the battery into thermal energy for passive balancing. . The battery balancing circuit board 43 is disposed between the battery management circuit board 41 and the heat sink 42 and is fixed to the heat sink 42. The battery balancing circuit board 43 is provided with a battery balancing control assembly for dissipating excess power consumption in the battery 23 into thermal energy. The heat sink 42 includes a metal piece. The metal piece is stamped with a protruding portion 421, and a receiving area 422 is defined in the protruding portion 421. The battery balancing circuit board 43 is received in the receiving area 422.

As shown in FIG. 5, FIG. 8 , FIG. 10 and FIG. 11 , the cover 30 is provided with an opening 31 for receiving the protruding portion 421 of the heat sink 42 , and the protruding portion 421 . The cover body 30 extends. The battery system further includes a heat dissipation fin 50. The bottom of the heat dissipation fin 50 is combined with a portion of the protrusion 421 extending from the cover body 30.

In summary, the foregoing battery system 100 may have the following assembly steps: Step 1: Place the bottom bracket 22 of the frame into the battery pack housing 10; Step 2: the battery 23 is placed in the bottom bracket 22; step 3: the top bracket 21 is placed above the battery 23; step 4: the support column 211 is locked above the column 212 of the top bracket 21; step 5: the battery management circuit The plate 41 is above the support column 211 and then locked by the fixing post 213; Step 6: the battery balancing circuit board 43 is locked in the receiving area 422 of the heat sink 42; Step 7: The heat sink 42 is screwed to the short copper column Step 213; step 8: connect various batteries, battery management module, battery balance module to each other; step 9: cover the cover 30 to the housing 10, and lock with screws; step 10: will dissipate heat The cover 42 is locked with the cover 30; step 11: the heat dissipation fin 50 is locked above the cover 30.

As shown in the seventh figure, during operation of the battery system 100, the battery balancing circuit board 43 is in a passively balanced manner to convert excess electrical energy in the battery into thermal energy. During operation, considerable heat is generated, so the battery balancing circuit board 43 can be directly connected to the heat sink 42. In this embodiment, the battery balancing circuit board 43 and the heat sink 42 are locked by screws. In the present embodiment, a field effect transistor is preferably used as the electronic switch 411. However, since the aforementioned protection function for the battery 23 is controlled by the electronic switch 411, that is, the field effect transistor, by high-frequency switching, a large amount of heat is inevitably generated, and therefore heat dissipation of the field effect transistor 411 is very important.

The field effect transistor of the battery system 100 as the electronic switch 411 is disposed on the battery management circuit board 41, and an insulating sheet is further disposed between the electronic switch 411 and the heat sink 42. The foregoing insulating sheet material includes silicone rubber and mica flakes. The foregoing insulating sheet can prevent the electronic switch 411 from being broken down and failing when the electric leakage occurs. The projected area of the insulating sheet on the heat sink 42 is larger than the projected area of the electronic switch 411 on the heat sink, that is, the area of the insulating sheet is larger than the area of the electronic switch 411, thereby preventing the electronic switch 411 from being in electrical contact with the heat sink. Further, a heat dissipating oil is disposed between the electronic switch 411 and the insulating sheet; and a heat dissipating oil is disposed between the heat sink 42 and the insulating sheet. The aforementioned heat dissipating oil may be a heat dissipating resin. Thereby, the heat exchanger of the aforementioned electronic switch 411 is The heat dissipation oil is transferred to the insulating sheet, is transferred to the heat sink 42 through the heat dissipation oil, and finally transmitted to the heat dissipation fin 50 by the heat sink 42 and transmitted to the outside of the battery system 100, thereby ensuring that the internal heat of the battery system 100 can be timely consumed. Scattered.

It can be seen from the above embodiment that the configuration of battery systems of different specifications can be realized in the same housing, thereby increasing the sharing ratio of the housing. In addition, the battery management circuit board is mounted on the frame of the battery pack and spaced apart to facilitate good alignment of the wiring and facilitate the opening and maintenance of the cover. In addition, the battery balancing circuit board is disposed on the heat sink 42 to timely dissipate the heat generated by the passive balancing.

It is to be understood that the description is not to be construed as limited to The technical solutions in the various embodiments may also be combined as appropriate to form other embodiments that can be understood by those skilled in the art.

The detailed description of the preferred embodiments of the present invention is not intended to limit the scope of the present invention. All should be included in the scope of protection of the present invention.

100‧‧‧ battery system

10‧‧‧shell

20‧‧‧Battery components

21‧‧‧Top bracket

22‧‧‧ bottom bracket

23‧‧‧Battery

24‧‧‧Electrical parts

241‧‧‧First conductive parts

242‧‧‧Second conductive parts

211‧‧‧Support column

11‧‧‧ side wall

30‧‧‧ cover

31‧‧‧ openings

32‧‧‧Hands

41‧‧‧Battery Management Board

42‧‧‧heatsink

212‧‧‧ column

213‧‧‧ fixed column

411‧‧‧Electronic switch

421‧‧‧ protruding parts

422‧‧‧ Containment area

50‧‧‧ Heat sink fins

The first figure is a partial schematic view of the battery system of the present invention in the first embodiment; the second figure is a partial schematic view of the battery system of the present invention in the second embodiment; and the third figure is the battery component of the battery system shown in the second figure. 4 is a perspective view of a housing in a battery system shown in FIG. 2; a fifth perspective view is a perspective view of a cover body in a specific embodiment of the battery system of the present invention; and a sixth embodiment is a specific embodiment of the battery system of the present invention. The battery management circuit board is combined with a part of the frame to be a perspective view; the seventh picture is the exploded view of the battery management circuit board and associated components shown in the sixth figure; and the eighth figure is the perspective view of the heat sink shown in the sixth figure. The ninth drawing is a perspective view of the heat sink shown in the sixth embodiment of the present invention; the tenth drawing is a perspective view of the heat sink fin in a specific embodiment of the battery system of the present invention; The eleventh figure is a perspective view of the battery system as a whole after being assembled in an embodiment of the present invention.

21‧‧‧Top bracket

41‧‧‧Battery Management Board

42‧‧‧heatsink

211‧‧‧Support column

212‧‧‧ column

213‧‧‧ fixed column

Claims (10)

A battery system, wherein the battery system comprises: a battery assembly comprising: a frame; and a plurality of batteries disposed in the frame and electrically connected to each other; a housing for housing the battery assembly; a cover body covering the housing; and heat dissipation And a battery balancing circuit board fixedly disposed on the heat sink, and the battery balancing circuit board is provided with a battery balancing control component for dissipating excess electric energy in the battery into heat energy. The battery system of claim 1, wherein the heat sink comprises a metal piece, the metal piece is stamped with a protruding portion, and a receiving area is defined in the protruding portion, and the battery balancing circuit board is received in the receiving area. Inside. The battery system of claim 1, wherein the system further comprises a battery management circuit board on which is disposed a battery management control element for monitoring battery voltage, current and temperature. The battery system of claim 3, wherein the battery management control component comprises an electronic switch, and the battery management control component is further configured to protect the battery by controlling the switching of the electronic switch. The battery system of claim 4, wherein the electronic switch comprises a field effect transistor. The battery system of claim 4, wherein the system further comprises an insulating sheet disposed between the electronic switch and the heat sink. The battery system of claim 6, wherein the insulating sheet has a projected area on the heat sink that is larger than a projected area of the electronic switch on the heat sink to prevent electrical contact between the electronic switch and the heat sink. The battery system according to claim 6, wherein a heat dissipating oil is disposed between the electronic switch and the insulating sheet; and a heat dissipating oil is disposed between the heat sink and the insulating sheet. The battery system of claim 8, wherein the insulating sheet comprises silicone or mica; and the heat dissipating oil comprises a heat dissipating rouge. The battery system according to claim 2, wherein the cover body is provided with an opening for receiving the protruding portion of the heat sink; and the battery system further includes a heat dissipation fin covering the opening.