FR2694661A1 - Multi-element battery with cooling. - Google Patents

Abstract

a) Accumulator battery with several elements with cooling, b) battery characterized in that the cooling device is a two-dimensional hollow body, having supplies and evacuations (3) for a cooling fluid and in which are printed , from both sides, ribs (1) substantially perpendicular to the direction of flow and parallel to each other, these ribs forming interstices inside the hollow body, and in that the locations of each rib are corresponding together on both sides, additional indentations (2) are formed which butt against each other and stabilize the hollow body. c) The invention relates to accumulator batteries with several elements with cooling.

Description

"Multi-element battery with cooling"

  The invention relates to a battery pack

  with several elements in the walls which are in close contact with thermal conductivity

  with a cooling device.

  The heat dissipating in the accumula-

  electrochemical energy, originates to a large extent by Joule effect inside the cells in the parts traversed by the charging current and the discharge current This heat can be discharged only on the surface by radiation convection and conduction thermal (for example by

intermediate soil).

  In large energy accumulators the ratio of the surface to the volume is so unfavorable that the heat produced in the normal operation of

  charge / discharge can only be evacuated

  operating costs in excess of the permissible values

  for the life of the energy accumulator The consequence is a limitation of the use of

  (cooling pauses) or a reduction in the service life. Large battery units typically have up to 50 cells in which case, between the middle of the battery and the edge of the battery, there may be a temperature drop of 5 to 10 K Due to the different temperatures of the elements, the state of full charge, conditioned by the temperature dependent loading of temperature and other processes such as hydrogen evolution or oxygen recombination, is reached at different times. limited load, this leads to a dispersion of the state of charge and finally, after overloading of the badly charged elements, to the failure

of these elements.

  In the construction by elements of large

  accumulators of energy, we have already made a great deal of

  proposals to improve cooling, with these proposals for heat dissipation between the elements, according to GM

  74 39 582 discloses an arrangement of conductive sheets

  these of the heat between the different elements of

  preferably, from these sheets,

  These cooling elements protrude above the elements and can be cooled by a stream of air. According to GM 88 02 918, separation slots are provided between the various elements of an accumulator battery and these slots are filled with copper. in the form of expanded metal permeable to air and good conductor of heat But, according to GM document

  02 249, cooling bodies are also known

  double-walled flow with a coolant in contact with the surface

  narrow with the walls of neighboring elements.

  These bodies, however, frequently lack mechanical strength with respect to clamping forces

  to the assembly of the battery, vis-à-vis deformat-

  the walls due to the swelling pressure.

  The object of the invention is therefore to

  create a cooling body for batteries

  accumulators which has sufficient rigidity in the presence of the aforementioned deformation forces, and which

  Moreover, it is characterized by good exchange values.

thermal ge.

  This goal is achieved in accordance with the

  in that the cooling device is

  a two-dimensional hollow body with

  ments and evacuations for a fluid

  cold and in which are printed, from

  on both sides, essentially perpendicular ribs

  the direction of the flow and parallel to each other, these ribs forming interstices to

  the inside of the hollow body, and in that

  of each rib corresponding together on both sides, additional fingerprints are formed which end against each other and

  ensure a stabilization of the hollow body.

  Thanks to the subdivision of the hollow body into a plurality of partial spaces that do not communicate between

  they only through longitudinal interstices

  narrow naux, one obtains all the height of the body

  hollow a uniform distribution of the coolant

  of course, so that it also results in a

  transverse uniformity throughout the body of

  cooling in a predominantly horizontal direction

  Such a flow movement of the cooling fluid, and possibly also the heating liquid, is particularly advantageous for intensive heat exchange with the elements and, in particular

consequently, desirable.

  In a particular embodiment

  favorable aspect of the invention, the hollow body

  an additional rib which deflects the fluid from

  coldness arriving by directing it first towards the bottom of the hollow space From here, the hollow body is then traversed transversely by

  the following liquid of obliquely ascending components

  pendent. In another advantageous embodiment of the hollow body according to the invention, instead of the channel, deflection strips are arranged in the hollow space in addition to the ribs, these bars being

  distributed between them and parallel to them.

  The aforementioned ribs of the hollow body are

  obtained in a particularly simple way by

  longitudinal lure of these side walls.

  The hollow body or cooling body, as well as the heat exchanger according to the invention, according to a preferred technique for implementing the

  material and workmanship, is a hollow body in

  plastic material produced by the blowing process.

  Peculiarities of this form of reali-

  and variants thereof will be explained with the aid of the accompanying drawings, in which: FIG. 1 is a side view of a cooling body according to the invention,

  FIG. 2 is a cross sectional view of

  the cooling body of FIG. 1, FIG. 3 shows a detail of the cross sections of the cooling body,

  Figure 4 shows the cooling body

  FIG. 5 shows, on a larger scale, the supply of cooling fluid 3 of FIG.

  Figure 6 shows the flow supply.

  cooling device of FIG. 5 with a connection piece,

  Figure 7 shows in elevation,

  of the refrigerating body

dissement according to the invention.

  According to Figure 1, the cooling body

  is subdivided into several partial hollow spaces by ribs or longitudinal moldings 1 which are placed opposite each other on both sides

  and which extend over the entire height of the hollow body.

  The hollow spaces then communicate through

  narrow longitudinal interstices corresponding to

  reducing the cross-section of the

  the initial hollow space caused by the longitudinal moldings

  tudinal. On each longitudinal molding 1 are in

  in addition to fingerprints 2 to which correspond-

  the same impressions on the opposite side of the hollow body and with which they come end to end inside the hollow space, so that space

  hollow is removed between these fingerprints.

  They thus make a decisive contribution to the internal consolidation of the hollow body because they support the longitudinal moldings reciprocally and,

  through these, the side walls.

  The pressures exerted from the outside on the hollow body due to the displacement or bulging of the tanks

  of elements, are thus absorbed with certainty.

  Power supplies and evacuations 3 of

  coolant on the upper side

  the cooling body, are directly formed during its manufacture by the blowing process. The horizontal cross-sectional representation of the cooling body, according to FIG. 2, makes it possible to clearly see the segmentation of the hollow space into several partial spaces with interstice-like passages between the moldings.

respectively opposite.

  Figure 3 is a representation for more

  large scale of the first two hollow spaces par-

  FIG. 2 The plane of the drawing then intersects, along the broken line A-A of FIG. 1, the first molding 1 at a level outside a

  additional footprint 2, and cuts the second

  re 1 at a level which coincide the moldings 1 and the footprints 2 reported on them As can be seen, the gap previously existing

  between a partial hollow space and the hollow space

  neighbor, is in this case completely closed.

  Figure 4 shows the hollow body in

  Figure 1 of FIG. 1 seen from a narrow side.

  Its total thickness should be, in accordance with the invention, 4 to 6 mm, and preferably about 5 mm, in which case the wall thicknesses are

  approximately 0.5 and 1 mm in these conditions.

  tions, good stability is obtained against

  elements, and also good values of

thermal changes.

  The cooling fluid connection 3 (see FIG. 1) represented on a larger scale on

  FIG. 5 is provided, according to the invention, with a surface

  this seal 4 on the periphery of its inner wall

  ne, so that a connecting piece of the cana-

  the supply or discharge of the cooling fluid

  dissement, can be set up tightly

  via a sealing element.

  Such a connecting piece is for example the bent piece 6 shown in FIG. 6,

  with an O-ring 7 as a sealing element.

  As other advantageous provisions of

  FIGS. 5 and 6 show, in connection with the

  cooling fluid rope, a counter-

  draft 5 which allows a snap of the piece

  bent 6 and also makes it possible to rotate

  it is in its sealing position.

  In a modified form, according to FIG. 7, of the cooling body according to the invention, the previously described uniform flow of cooling fluid can be further improved in that

  rib 8 reported in the zone of ar-

  riveted, channels the incoming coolant,

  by deflecting it towards the bottom of the cooling body

  From there, the coolant then ascends obliquely upward toward the exhaust, spreading over the height of the hollow space and then crossing the interstices between the ribs. To allow a diffuse distribution of the

  cooling fluid flow over the entire

  In addition to the cooling body, deflection strips 9 are provided which are arranged between the longitudinal moldings 1, either as a replacement for the ribs 8 or also in combination with them, as shown in FIG. 7. These deflection rods however do not reach the bottom and

  to the upper side of the hollow space

  also contribute to the stability of form of this

  hollow space with respect to the pressure forces to which

  are subjected to the extended sides of the cooling body

  and, like the 8-channel bar-type limitation, can be directly trained on

  the body blown during the manufacturing process.

Claims (8)

  1. Battery with multiple elements in the walls that are in close contact with   thermal conductivity with a cooling device   dissement, a storage battery characterized in that the cooling device is a two-dimensional hollow body, having power supplies   and evacuations (3) for a cooling fluid   and in which are printed, from both   sides, ribs (1) essentially perpendicular   flow direction and parallels between   they, these ribs forming interstices in the   of the hollow body, and in that at   each rib corresponding together of the two sides   more impressions (2)   come end-to-end against each other and   have stabilized the hollow body.   2. Battery according to the claim   1, characterized in that a nerve   additional vane (8) which directs towards the bottom of the   hollow body, the cooling fluid that arrives.   3. Battery according to one   any of claims 1 or 2, characterized in that   in addition to the ribs, deflection webs (9) parallel to the ribs are used in the hollow body. 4. Battery according to one   any of claims 1 to 3, characterized in that   what the hollow body and a plastic body   realized according to the blowing process.   5. Battery according to the claim   4, characterized in that the thickness of the wall of the plastic hollow body is 0.5 to 1 mm. 6 Battery according to one   any of claims 4 and 5, characterized in that   what the total thickness of the hollow body made of   plastic is 4 to 6 mm and preferably 5 mm.   7. Battery according to one   any of claims 4 to 6, characterized in that   on the inner walls of each supply and each cooling fluid outlet, there are provided sealing surfaces (4) for   to receive a sealing member.   8 Battery according to one   any of claims 4 to 7, characterized in that   what in the power supplies and evacuations of   cooling fluid, a counterflow is   clearance (5) for latching a piece of string (6).