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DE-102024003726-A1 - Electrical energy storage and manufacturing process

DE102024003726A1DE 102024003726 A1DE102024003726 A1DE 102024003726A1DE-102024003726-A1

Abstract

The invention relates to an electrical energy storage device comprising a plurality of electrically interconnected individual cells (1) and a temperature control device (3, 3') for temperature control of the individual cells (1), wherein the individual cells (1) are positioned and held in a housing by means of a cell holder (2, 2'). According to the invention, the cell holder (2, 2') is designed as a temperature control device (3, 3') with a channel structure (K, K').

Inventors

  • Cristian Leu

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20241113

Claims (10)

  1. Electrical energy storage device with a plurality of electrically interconnected individual cells (1) and a temperature control device (3, 3') for temperature control of the individual cells (1), wherein the individual cells (1) are positioned and held in a housing by means of a cell holder (2, 2'), characterized in that the cell holder (2, 2') is designed as a temperature control device (3, 3') with a channel structure (K, K').
  2. Electrical energy storage according to Claim 1 , characterized in that the cell holder (2, 2') is designed as a blow-molded part.
  3. Electrical energy storage according to Claim 1 or 2 , characterized in that the cell holder (2, 2') is shaped relative to the individual cells (1) by means of a liquid which reacts with a material of the channel structure (K, K').
  4. Electrical energy storage device according to one of the preceding claims, characterized in that the cell holder (2, 2') extends between a plurality of adjacent individual cells (1) and is positively engaged at least over a predetermined section with an outer contour of a cell housing of the respective individual cell (1).
  5. Electrical energy storage according to Claim 4 , characterized in that the cell holder (2, 2') extends at least partially over a bottom area and/or a cell lid area opposite it of the cell casing of the respective single cell (1).
  6. Electrical energy storage device according to one of the preceding claims, characterized in that a partial area (T) of the cell holder (2') extends over a predetermined area between a housing base of the housing and a base area of a cell housing of a predetermined number of individual cells (1).
  7. Electrical energy storage according to Claim 6 , characterized in that separation elements (S) project vertically from the sub-area (T) of the cell holder (2') at regular intervals, the channel structure (K') of which is fluidically connected to a channel structure (K') of the sub-area (T) or is separated from the channel structure (K') of the sub-area (T).
  8. Electrical energy storage device according to one of the preceding claims, characterized in that the channel structure (K, K') of the cell holder (2, 2') is filled with a phase change material and/or a foam and/or a liquid containing a flame retardant.
  9. Method for manufacturing an electrical energy storage device according to one of the preceding claims, wherein - the cell holder (2, 2') is positioned in an initial state with respect to the individual cells (1) and - when the cell holder (2, 2') is positioned, the cell holder (2, 2') and the channel structure (K, K') are formed with respect to the individual cells (1) by means of blow molding and/or by means of a liquid that reacts with a material of the cell holder (2, 2').
  10. Procedure according to Claim 9 , characterized in that the channel structure (K, K') is filled with a phase change material and/or a foam and/or a liquid containing a flame retardant.

Description

The invention relates to an electrical energy storage device comprising a plurality of electrically interconnected individual cells and a temperature control device for maintaining the temperature of the individual cells, wherein the individual cells are positioned and held in a housing by means of a cell holder. The invention further relates to a method for manufacturing such an electrical energy storage device. From the US 2018/0219265 A1 A device and materials for cooling battery cells are known. The device, molded from plastic, comprises a plastic cooling channel with an inner surface and an outer surface; the cooling channel comprises a polycarbonate and a phosphazene additive; the plastic cooling channel is configured to allow a fluid to come into contact with the inner surface and to prevent the fluid from coming into contact with the outer surface, the outer surface being configured to provide structural support for the battery cells. The invention is based on the objective of providing an electrical energy storage device with a plurality of electrically interconnected individual cells and a method for manufacturing the electrical energy storage device. The problem is solved according to the invention by an electrical energy storage device which has the features specified in claim 1, and by a method which has the features specified in claim 9. Advantageous embodiments of the invention are the subject of the dependent claims. An electrical energy storage device comprises a plurality of electrically interconnected individual cells and a temperature control device for maintaining the temperature of the individual cells, wherein the individual cells are positioned and held in a housing by means of a cell holder. According to the invention, the cell holder is designed as a temperature control device with a channel structure. In such a designed electrical energy storage device, the number of components is reduced, since the cell holder also takes on the function of the temperature control device, whereby the individual cells are aligned and spaced apart from each other by means of the cell holder and are thus electrically isolated from each other. In one embodiment, the cell holder with its channel structure is designed as a blow-molded part, whereby the shape of the cell holder and thus of the temperature control device results at least partially depending on environmental components, i.e., depending on the individual cells. In an alternative or additional embodiment, the cell holder is shaped relative to the individual cells by means of a liquid that reacts with a material of the channel structure. This means that the cell holder and its channel structure are formed by means of the liquid. In particular, the cell holder is designed in such a way that the spaces between adjacent individual cells are filled, thus eliminating the need to fill the spaces with potting compound. Furthermore, the fact that the cell holder is shaped in relation to each individual cell allows for tolerance compensation. Furthermore, the cell holder, designed as a temperature control device, is relatively easy to assemble, and, particularly through automated processes, requires a comparatively short assembly time. In another embodiment, the cell holder extends between a multitude of adjacent individual cells and rests in a form-fitting manner against the outer contour of a cell housing of the respective individual cell, at least over a predetermined section. For example, the cell holder, designed as a temperature control device, together with the individual cells that are held in a form-fitting manner by means of the cell holder, forms a compact unit that can be inserted into and removed from the housing as such. In one possible embodiment, the cell holder extends at least partially over a base area and/or a cell lid area opposite it in the cell housing of the respective individual cell. This allows the individual cells to be temperature-controlled laterally, from the base area and from the cell lid area, in order to dissipate heat generated during operation, particularly during charging and discharging. This makes it possible to operate the individual cell within its optimized operating range. Such a design of the cell holder, which also functions as a temperature control device, optimizes thermal coupling between the individual cells and the temperature control device. The area of thermal coupling between the temperature control device and the individual cells is comparatively large. Furthermore, one embodiment provides that a section of the cell holder extends over a predetermined area between a housing base and a base area of a cell holder. The building comprises a predetermined number of individual cells. This means that this number of individual cells is placed on top of the sub-area and is therefore thermally coupled to it, at least on the floor side, in order to dissipate heat loss. In this further development, separation