CN202004118U

CN202004118U - Battery pack

Info

Publication number: CN202004118U
Application number: CN2011200672937U
Authority: CN
Inventors: 裴贻华
Original assignee: Ningde Amperex Technology Ltd; Dongguan Amperex Electronics Technology Ltd; Dongguan Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd; Dongguan Amperex Electronics Technology Ltd; Dongguan Amperex Technology Ltd
Priority date: 2011-03-15
Filing date: 2011-03-15
Publication date: 2011-10-05
Anticipated expiration: 2021-03-15

Abstract

The utility model discloses a battery pack, which comprises a box body and battery cores accommodated in the box body. An internal heat exchanger is arranged in the box body. A liquid accumulator, an external heat exchanger and a power pump are arranged outside the box body. The power pump, the internal heat exchanger, the liquid accumulator and the external heat exchanger are in sealing connection by conduits to form a closed loop capable of circulating a liquid medium. The liquid medium in the liquid accumulator of the battery pack provided by the utility model can flow through the battery cores under the drive of the power pump, flows into the external heat exchanger outside the box body after finishing exchanging heat with the battery cores by the internal heat exchanger, and reflows back into the liquid accumulator after exchanging the heat with the outside. The liquid medium circulated in the closed loop is heated or cooled to ensure all the battery cores work in an ideal temperature range, prevent the extremely low or overhigh internal temperature of the battery pack and prolong the service life of the battery pack.

Description

Battery pack

Technical field

The utility model relates to a kind of battery pack, especially a kind of battery pack of long service life.

Background technology

Increasingly serious along with environmental problem, low-carbon economy has become the prevailing model of future economy development.Hybrid vehicle and electric automobile have also obtained vast production firm and consumer's approval gradually as the representative of new-energy automobile.Power battery pack has become the core component and the key technology of electric automobile as the major impetus source of new-energy automobile.

According to the characteristics and the application scenario of power battery pack itself, the user has proposed very strict requirement to all many-sides such as its capacity, power, reliability, fail safe and life-spans.Heat management system is the necessary means that realizes high power, life-saving, raising reliability and fail safe, and under the situation that heat management system is got involved, the heat that the part produces in the battery pack can equilibrate to other electric cores fast or be transferred to beyond the battery pack.

The available dynamic battery pack is generally used air cooling way, the disadvantage of air cooling way is to be subjected to the inner windage effect of battery pack, the wind speed and the flow of interior zone differ greatly, the temperature difference of air inlet and air outlet is very big, be difficult to accomplish that temperature is even in the battery pack, thereby influenced the useful life of battery pack.

In view of this, the necessary battery pack that a kind of long service life is provided.

Summary of the invention

The purpose of this utility model is: the battery pack that a kind of long service life is provided.

In order to realize above-mentioned utility model purpose, the utility model provides a kind of battery pack, and it comprises casing and the electric core that is contained in the casing, is provided with interior heat exchanger in the casing, and casing is provided with fluid reservoir, outer heat-exchanger and kinetic pump outward.Kinetic pump, interior heat exchanger, fluid reservoir and outer heat-exchanger are tightly connected by conduit, and formation is the loop of medium circulation for liquid.

As a kind of improvement of the utility model battery pack, described casing is provided with base plate and from the upwardly extending sidewall of base plate, described interior heat exchanger is arranged on the described base plate, and described electric core places on the described interior heat exchanger.

As a kind of improvement of the utility model battery pack, described interior heat exchanger is a fluid passage, and fluid passage directly is arranged in the described base plate or by welding, riveted joint and is connected on the described base plate.

As a kind of improvement of the utility model battery pack, the base plate of described casing has extended upward some fins, and the sidewall of fin and fin or fin and described casing surrounds receiving space, and described electric core correspondence is contained in the receiving space.

As a kind of improvement of the utility model battery pack, described interior heat exchanger is a fluid passage, and fluid passage extends in the described fin.

As a kind of improvement of the utility model battery pack, the described electric core of all or part of encirclement of described fin.

As a kind of improvement of the utility model battery pack, described fin and base plate all are to be made by metal with good heat conductive performance or nonmetallic materials.

As a kind of improvement of the utility model battery pack, the gap of described fin and electric core fully is filled with Heat Conduction Material.

As a kind of improvement of the utility model battery pack, described Heat Conduction Material is formed by the liquid heat conductive material solidification.

As a kind of improvement of the utility model battery pack, the temperature of described liquid medium is adjustable.

With respect to prior art, the utility model battery pack has the following advantages: the electric core of under the promotion of kinetic pump, flowing through of the liquid medium in the fluid reservoir, and finish to flow into after the heat exchange with electric core by interior heat exchanger and be positioned at the outer fluid reservoir of casing.By the liquid medium that is circulated in the loop is heated or cooling, can guarantee that all electric cores all work in desirable temperature range, reduce the temperature difference of each electric core, therefore can prevent that the battery pack internal temperature from crossing low or too high, improve the security performance of battery pack, prolong the useful life of battery pack.

Description of drawings

Below in conjunction with the drawings and specific embodiments, the utility model battery pack and useful technique effect thereof are elaborated.

Fig. 1 is the schematic perspective view of the utility model battery pack.

Fig. 2 is the schematic perspective view of the electric core module of heat exchanger in having in the utility model battery pack.

Fig. 3 is the structural representation that is arranged in the heat exchanger of Fig. 2 electricity core module.

Fig. 4 is the structural representation of electric core and interior heat exchanger in the electric core module of heat exchanger in having.

Fig. 5 is the schematic perspective view of an electric core of heat exchanger in being equipped with.

Fig. 6 is a heat exchange schematic diagram of electric core and interior heat exchanger.

Fig. 7 is another heat exchange schematic diagram of electric core and interior heat exchanger.

Fig. 8 is the assemble method schematic diagram of the utility model battery pack.

Embodiment

Goal of the invention of the present utility model, technical scheme and useful technique effect are more clear to be understood in order to make, and below in conjunction with the drawings and specific embodiments, the utility model battery pack is further elaborated.Should be understood that the embodiment of describing in this specification only is in order to understand the utility model, is not in order to limit the utility model.

See also Fig. 1 to shown in Figure 8, the utility model battery pack comprises casing 10 and several electric cores 23 that are contained in the casing 10, heat exchanger 4 in being provided with in the casing 10, casing 10 outer fluid reservoir 3, outer heat-exchanger 1 and the kinetic pumps 2 of being provided with.Kinetic pump 2, interior heat exchanger 4, fluid reservoir 3 and outer heat-exchanger 1 are tightly connected by conduit 5, form a loop of medium circulation for liquid.

See also Fig. 2 to shown in Figure 7, casing 10 is provided with base plate 22 and from base plate 22 upwardly extending some sidewalls 21, extends upward several fins 29 from base plate 22, the electric core 23 of fin 29 all or part of encirclements.In illustrated embodiment, base plate 22 and fin 29 all are to be made by metal with good heat conductive performance or nonmetallic materials.

Adjacent fin 29 or fin 29 surround the receiving space of accommodating electric core 23 jointly with the sidewall 21 of casing 10, electricity core 23 correspondences are contained in the receiving space, and the gap between the sidewall 21 of the gap between fin 29 and the electric core 23, fin 29 and casing 10 fully is filled with Heat Conduction Material 30.The filling mode of Heat Conduction Material 30 is not particularly limited, can directly fill solid-state Heat Conduction Material 30, also can be earlier in the gap of the gap of fin 29 and electric core 23, fin 29 and the sidewall 21 of casing 10 the liquid Heat Conduction Material 30 of perfusion, treat fully to be filled in after liquid Heat Conduction Material 30 solidifies the gap between the sidewall 21 of gap, fin 29 and casing 10 between fin 29 and the electric core 23, as shown in Figure 8.

See also Fig. 3, Fig. 6 and shown in Figure 7, base plate 22 places of casing 10 are provided with interior heat exchanger 4, in illustrated embodiment, interior heat exchanger 4 is the fluid passage 28 of undulate bending, and the two ends of fluid passage 28 are tightly connected with the conduit 5 that is positioned at casing 10 outsides respectively by inlet 27 and liquid outlet 26.In illustrated embodiment, fluid passage 28 is set directly in the base plate 22.But according to other execution modes of the present utility model, fluid passage 28 also can be installed on the base plate 22 by welding or riveted joint.In order to improve the efficient of heat exchange, fluid passage 28 can also be arranged to other curved shape, to increase heat exchange area and heat exchanger time.In addition, see also shown in Figure 7ly, in order further to improve heat exchanger effectiveness, fluid passage 28 can also extend in the fin 29.

See also shown in Figure 1ly, outer heat-exchanger 1 is positioned at the outside of casing 10, and one end and fluid reservoir 3 are tightly connected, and the other end and kinetic pump 2 are tightly connected.After liquid medium enters outer heat-exchanger 1, can carry out heat exchange with external environment, the temperature of liquid medium in the scalable closed circulation loop.

Fluid reservoir 3 is used for the storing liquid medium, and the coolant that flows out from liquid outlet 26 can flow back to fluid reservoir 3, and can flow out fluid reservoir 3 under the driving of kinetic pump 2.

Kinetic pump 2 is the power source of the utility model battery pack, when kinetic pump 2 starts, liquid medium in the fluid reservoir 3 enters fluid passage 28 through conduit 5 from inlet 27 under the driving of kinetic pump 2, after the heat exchange of finishing with electric core 23, flow out from liquid outlet 26, enter fluid reservoir 3 through conduit 5, get back to kinetic pump 2 through over-heat-exchanger 1 again.So circulation by the temperature of outer heat-exchanger 1 regulator solution body medium, can guarantee that electric core 23 works in the rational temperature scope.

The assembling process of the utility model battery pack is as follows: at first, electric core 23 stably is contained in the receiving space that base plate 22 and fin 29 enclose successively, gap between electricity core 23 and the fin 29 is fully filled by heat filling 30, and electric core 23 places on the interior heat exchanger 4; Secondly, connect fluid reservoir 3, outer heat-exchanger 1, kinetic pump 2 and interior heat exchanger 4 according to mode shown in Figure 1 successively by sealing guide passage 5, formation is the loop of medium circulation for liquid.

According to another execution mode of the present utility model, also can according to predetermined mode electric core 23 be connected into electric core module by positive terminal 24 and anode connector 25 earlier, each electric core module is equipped with interior heat exchanger 4, and the liquid medium in the interior heat exchanger 4 of adjacent electric core module connects by linker 6.

The operation principle of the utility model battery pack is as follows: when battery pack is worked, start kinetic pump 2, liquid medium in the fluid reservoir 3 enters the fluid passage 28 of the base plate 22 that is arranged in casing 10 through inlet 27, finish heat exchange with electric core 23 or electric core module and flow into outer heat-exchangers 1 and extraneous heat exchange through liquid outlet 26 afterwards, flow back into fluid reservoir 3 at last.By regulating the temperature of liquid medium in the loop, can guarantee that electric core 23 or electric core module work in desirable temperature range.

In conjunction with top detailed description to the utility model embodiment as can be seen, with respect to prior art, the utility model battery pack has the following advantages: the liquid medium in the fluid reservoir under the promotion of kinetic pump, flow through electric core or electric core module, and finish to flow into after the heat exchange with electric core or electric core module by interior heat exchanger and be positioned at the outer fluid reservoir of casing.By the liquid medium that is circulated in the loop is heated or cooling, can guarantee that all electric cores or electric core module all work in desirable temperature range, the temperature difference of each electric core is less, therefore can prevent that the battery pack internal temperature from crossing low or too high, improve the security performance of battery pack, prolong the useful life of battery pack.

According to above-mentioned principle; can also carry out suitable change and modification to above-mentioned execution mode; therefore; the embodiment that discloses and describe above the utility model temperature battery pack is not limited to also should fall in the protection range of claim of the present utility model some modifications and changes of the utility model structure.In addition, although used some specific terms in this specification, these terms do not constitute any restriction to the utility model just for convenience of description.

Claims

1. battery pack, comprise casing and the electric core that is contained in the casing, it is characterized in that: be provided with interior heat exchanger in the described casing, described casing is provided with fluid reservoir, outer heat-exchanger and kinetic pump outward, kinetic pump, interior heat exchanger, fluid reservoir and outer heat-exchanger are tightly connected by conduit, and formation is the loop of medium circulation for liquid.

2. battery pack according to claim 1 is characterized in that: described casing is provided with base plate and from the upwardly extending sidewall of base plate, described interior heat exchanger is arranged on the described base plate, and described electric core places on the described interior heat exchanger.

3. battery pack according to claim 2 is characterized in that: heat exchanger is a fluid passage in described, and fluid passage directly is arranged in the described base plate or by welding, riveted joint and is connected on the described base plate.

4. battery pack according to claim 2 is characterized in that: the base plate of described casing has extended upward some fins, and the sidewall of fin and fin or fin and described casing surrounds receiving space, and described electric core correspondence is contained in the receiving space.

5. battery pack according to claim 4 is characterized in that: heat exchanger is a fluid passage in described, and fluid passage extends in the described fin.

6. battery pack according to claim 4 is characterized in that: the described electric core of all or part of encirclement of described fin.

7. battery pack according to claim 4 is characterized in that: described fin and base plate all are to be made by metal with good heat conductive performance or nonmetallic materials.

8. battery pack according to claim 4 is characterized in that: the gap of described fin and electric core fully is filled with Heat Conduction Material.

9. battery pack according to claim 8 is characterized in that: described Heat Conduction Material is formed by the liquid heat conductive material solidification.

10. according to each described battery pack in the claim 1 to 9, it is characterized in that: the temperature of described liquid medium is adjustable.