Battery cooling system

Technical Field

The invention relates to a cooling pipe is provided with a battery of the battery cooling system, the use of homogeneous contact force cooling of the battery on the voltage of the battery or the battery of the motor vehicle on the module, in order to obtain improved thermal contact.

Background Art

In the electric energy storage, to the motor vehicle (such as an electric vehicle or hybrid vehicle) to provide voltage device is often referred to as a battery, the majority of cases, using a plurality of battery module, its by means of oxidation and reduction of electrolyte electrochemical principle to work, so as to produce the heat loss.

A stack of separate battery module most cases is inserted in the mechanical end plate and the pull rod to establish energy storage. In addition to mechanical fixing between the modules to each other, end plate and the pull rod, in particular for offset by the battery module during the operation of the deformation caused by a change of the air pressure.

In order to ensure the required operating temperature, battery module usually require cooling, that is, through heat exchanger (also called battery cooler) the elimination of excessive heat. In a hybrid vehicle, the battery cooler can be connected to the coolant circuit of the engine, in the electric motor vehicle, the HVAC system is connected to the refrigerant circuit.

In the prior art, the battery cooler or battery cooling pipe are respectively combined directly to the battery or the battery case is pressed against the battery module.

For example, in DE102010038600A1 described in for a cooling system of the battery module, which is provided with a spring system, the spring system in the cooling system at the bottom of the battery module concora crush, the spring system is arranged at between the battery case and a cooling system, the support against the bottom of the battery case.

In EP2337142A1 in, is described for a cooling system of the battery module, with the same elastic the establishment of the contact plane of the cooling system, the pressure against the pre-stress will be at the bottom of the battery itself.

In DE102010029872A1 in, is described for a cooling system of the battery module, with several clamping element thereof, forcing the flat cooling bodies to the bottom of the battery module.

Generally speaking, the battery cooler is pressed to the conceptual design of the battery module is very heavy, so as to require a larger installation space, this greatly increased the total weight of the battery.

Content of the invention

The purpose of this invention is to provide a simple, light weight, and can be cost-effective in the small space requirement of cooling of the battery module to the battery cooling system.

According to claim 1 solves the problem that the characteristic of the problem the theme of; dependent claims provide further embodiments.

According to the present invention, more specifically, by a kind of the battery, two battery cooling tube and clamping element battery cooling system to solve the problem, the clamping element for thermal contact and forced against the cooling pipe of the battery on the battery. Assuming that battery is usually rectangular, the battery is placed parallel to the cooling pipe, and keep a certain distance from each other and longitudinally placed on the battery. The clamping element is designed with a center portion and from the central portion extends along the two sides of the of two supports on both sides the wing, each gripping wings in extended in the longitudinal direction (in the longitudinal direction extending in the direction of the) contact with the battery cooling pipe. In this way, in a preferred embodiment, the flat tube is established as a battery cooling tube throughout its length and is against on the battery, and to provide appropriate force, the heat loss of the battery on the large surface of the flat pipe is absorbed.

In order to in the battery cooling tube is realized on the whole longitudinally extending uniform clamping force, the center portion of the clamping element preferably is provided with a strengthening member, extending from the center portion supports on both sides the wing.

Extends along the longitudinal direction of the reinforcement is advantageously established as a bead or rib.

The clamping element is advantageously established as a spring made of metal material.

According to a favourable embodiment of the present invention, the clamping element by means of a bolt is attached to the central part and a force-closed reversibly by forming directly connected to the battery. Or, the implementation of the housing form a closed guide, a battery bolt execution pressure the operation of the.

Because of the pre-assembled during the energy storage battery can be bolt connected to the battery cooler, therefore, in the final assembly process of the efforts in relatively low.

In order to prevent undesirable heat input through the clamping element, the clamping element is preferably set up a thermal isolation of the cooling pipe of the battery.

If the clamping element is directly connected to the battery, the heat transfer can be expected that the clamping element from the battery through the battery cooling tube, on the one hand the heat input to the battery from the battery directly to the cooling tube, on the other hand, the indirect heat input to the battery through the clamping element cooling tube.

According to the preferred embodiment of the present invention, the length of the clamping element 150 mm to 400 mm between, matching the length of the battery.

If a clamping element is established by a sheet form, the material thickness of the clamping element in the 0.3 mm to 1.0 mm between.

Preferably, the clamping element is kept in the rigid carrier place, in order to be used for increased stiffness, the material thickness of the carrier 6 mm to 10 mm between.

Or, pre-crown carrier can be used, so that the assembly can be deformed in a defined manner. In this way, thickness of the material can be less than 6 mm.

The carrier can also be a part of the battery case, such as the spring which support ribs.

Preferred embodiment of the present invention is provided with a carrier used for increasing the rigid pre-crown, so its material thickness is less than 6 mm.

Further according to the invention a favourable embodiment, a rigid carrier in the casing structure of the battery.

Preferably, the concept of the present invention is made by the sheet metal of the clamping elements and set up, the deformation of the clamping element by defining respectively generated cooler from the battery to the battery or the battery contact force on the module. According to the technical requirements, the spring characteristic can be according to Hooke's law through the clamping element material characteristics, material thickness and formed to adjust the design.

In order to obtain installation space and large tolerance of the battery module, when the 1st-time assembly of the spring are subjected to plastic deformation or deliberately allow plastic deformation, will be a more favourable. With this kind of method, it can be said that, according to the installation space for the stamping.

In order to in the absence of additional support in large SPAN under the condition of the use of the clamping element, the central portion is reinforced.

For the small SPAN is concerned, can be through the bead or reinforcement ribs. With more than 200 mm of the SPAN speaking, through the single carrier more favourable additional reinforcement. The use of the additional carrier allows for more perfectly to adapt to the required contact force of the spring characteristics of a spring.

In an advantageous embodiment of the invention, provided with the slit perpendicular to the longitudinal axis of the clamping elements of the clamping wing. Therefore, each part is formed as a deformable independently of each other. Highly flexible flat tube well adapt to irregularities in the surface of the battery. supports on both sides the wing timely action of the flexible part, like a single spring the same, so that the flat tube is better adapted to the surface of a cell.

In the present invention, very light weight and relatively small installation space and these advantages can be realized to the battery cooling pipe is combined with the possibility of battery (is also in order to obtain a part of the margin of the larger scale).

Description of drawings

The present invention further details, features and advantages of the example of the Figure through the engagement of the follow-up embodiment natural nature described becomes significant. With the adoption of the following display:

Figure 1: battery cutaway view of the cooling system, and

Figure 2: perspective view of the clamping element.

Mode of execution

Figure 1 shows a cooling system of the battery in the cutaway view. The cutaway view shows the basic structure of the battery cooling, wherein in the illustrated in the representation of the invention, the clamping element 4 is set up into a leaf spring 4, which are respectively forced battery cooling tube 3 against the battery or battery module 1. In the battery module 1, battery cooling pipe 3 and the spring 4 is mounted to the battery case 2 during in the, spring 4 is pre-stress, to ensure that the battery cooling tube 3, in the longitudinal extension of the battery against the 1 upper.

If the leaf spring 4 is arranged to SPAN the length of the greater than 200 mm, as shown in the specific embodiment of the invention a favourable, separate rigid carrier through the same 5 and to the spring in the longitudinal direction 4 of the additional enhancement of the establishment. Is provided with a central portion 9 of the leaf spring 4 is fixed to the carrier 5, carrier 5 absorbing spring leaf 4 supports on both sides the wing 8 of the the elasticity of the spring. Carrier 5 is connected to the battery housing 2, the elasticity of the spring will be transmitted to the battery case 2. Or, by the elastic force of the spring in the carrier into the housing structure.

Battery cooling tube 3 is designed into a flat tube, so that the battery module 1 the surface of the thermo-set up to be relatively large. Leaf spring 4 with a W-shaped cross-section. supports on both sides the wing 8 is an outer pillar, the angle of the end part, so that 8 supports on both sides the wing flat placed in battery cooling tube 3 is. Therefore, the relatively sensitive to the mechanical load of the flat tube 3 and the elastic force of the spring will not be possible because of the adoption of 8 supports on both sides the wingsupports on both sides the wing of the sharp edge of the 8 being damaged of the relative movement. Moreover, to ensure that the flat tube 3 of the even and directional force transmission.

Figure 2 shows on the vertical axis 7 of the two sides of the leaf spring is provided with a reinforcing member 4 of the embodiment is an example. Leaf spring 4 comprises a central part 9, the central portion 9 on the two sides into supports on both sides the wing 8, wherein in the illustrated design, spring 4 by the appropriate form and is heat treated sheet are integrally formed. Profile (cross-sectional) mirror Image symmetry, as shown in the in the representation of the, 8 supports on both sides the wing generated by each of the contact force of upwards. Strengthening member is is formed with the leaf spring 4 of the longitudinal axis 7 in the sheet parallel to the bead or rib 6.

Terminology

1. Battery, battery module

2. Cell shell

3. Battery cooling tube, the flat tube

4. Clamping element, spring

5. Rigid carrier

6. Bead, lithos

7. Longitudinal axis

8. supports on both sides the wing

9. Center portion