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CN-122029652-A - Battery comprising at least one cell stack and an associated elastic device for compensating for play

CN122029652ACN 122029652 ACN122029652 ACN 122029652ACN-122029652-A

Abstract

The invention relates to a battery (1) for storing electrical energy, comprising at least one stack (7) of cells (6), and a housing comprising a base (3) to which the stack (7) of cells of the battery (1) is attached. The battery (1) comprises at least two compression plates (8) arranged on both sides of the stack, means (10) for attaching the compression plates (8) to the base (3), at least one tie rod (12) capable of pressing the compression plates (8) against the cells (6) of the stack (7), and at least one elastic device (15) for compensating for the gap of the stack in the direction of dimensional change of the stack, the device comprising at least one flat wire wave spring.

Inventors

  • Frederick Pinard
  • Sebastian Thomas Searle
  • Kevin Kapler

Assignees

  • 赛峰电气与电源公司

Dates

Publication Date
20260512
Application Date
20241011
Priority Date
20231014

Claims (9)

  1. 1. A battery (1) for storing electrical energy, the battery comprising at least one stack (7) of cells (6) and a housing (2) comprising a base (3) to which the stack (7) of the battery (1) is attached, Characterized in that the battery (1) comprises at least two compression plates (8) arranged on both sides of the stack (7), means (10) for attaching the compression plates (8) to the base (3), at least one tie rod (12) capable of pressing the compression plates (8) against the cells (6) of the stack (7), and at least one elastic device (15) for compensating the gap of the stack in the direction of dimensional change of the stack, the elastic device comprising at least one flat wire wave spring.
  2. 2. Battery (1) according to claim 1, wherein each elastic device (15) comprises at least one spring (16) compressed between a pair of support members (17) substantially perpendicular to the direction of dimensional change of the stack (7).
  3. 3. The battery (1) according to claim 2, wherein each support member (17) comprises a first face (18) and a second face (19), which are planar and opposite, said second face (19) being provided with a reinforcement (20) intended to house the end of the at least one spring (16) being compressed.
  4. 4. A battery (1) according to any one of claims 1 to 3, wherein at least one elastic device (15) comprises at least one spring (16) having an axial direction oriented along the direction of variation of the dimensions of the stack (7).
  5. 5. Battery (1) according to any one of claims 1 to 4, wherein at least one elastic device (15) comprises a plurality of concentric springs (16) surrounding the direction of dimensional change of the stack (7).
  6. 6. The battery (1) according to any one of the preceding claims 1 to 5, wherein the support member (17) is made of an electrically insulating material.
  7. 7. The battery (1) according to any one of the preceding claims 2 to 6, wherein the adjacent support members (17) corresponding to the adjacent stacks (7) each comprise a first hook (21) and a second hook (22) opposite each other and aligned in a transversal direction perpendicular to the longitudinal axis (X) of the adjacent stack (7), the hooks (21, 22) having complementary U-shapes allowing the first hook (21) of a first support member to slide through the second hook (22) of a second support member adjacent to the first support member and allowing the tie rod (12) to pass through the hooks (21, 22) without interfering with the relative translation of the adjacent support members in the direction of dimensional change of the stack (7).
  8. 8. The battery (1) according to any of the preceding claims 1 to 7, wherein the number of tie rods (12) is one unit greater than the number of cell stacks (7).
  9. 9. An aircraft comprising a battery according to any one of claims 1 to 8.

Description

Battery comprising at least one cell stack and an associated elastic device for compensating for play Technical Field The present invention relates to the storage of electrical energy, in particular in the field of aviation. The present invention relates generally to the storage of electrical energy for applications where quality is an important issue, such as in aviation. Background Traditionally, in the field of aviation, the storage of electrical energy is performed using low voltage lithium ion batteries (typically with voltages below 120V). The term "battery" refers to a set of individual modules each comprising a plurality of power elements arranged in series and/or parallel to achieve a desired voltage and capacitance. Modern aircraft are increasingly demanding in terms of electrical energy, which requires batteries to be configured accordingly. In fact, climate change is a major concern for many legislation and regulatory authorities worldwide. Various measures to limit carbon emissions have been, are being or will be taken in various countries. Civil aviation has been devoted to contributing to the management of climate change for several years. Various technical research efforts have made it possible to significantly improve the environmental performance of aircraft. Accordingly, applicants are continually striving to reduce their negative impact on the climate in order to reduce their active environmental footprint by using appropriate methods and with appropriate development and manufacturing methods and minimizing greenhouse gas emissions as much as possible. This ongoing development effort has been directed to both new generation aircraft engines, making aircraft lightweight (particularly by the materials used and lighter onboard equipment), developing and utilizing electrical technology to provide propulsion, and aviation biofuels. In order to provide the necessary power in the aircraft network while minimizing the weight of the electrical equipment, it is advantageous to increase the voltage of the battery to, for example, 800V. Within a high voltage battery, the power elements or battery cells are typically grouped into modules, each module containing a specific number of cells, including devices for mechanical attachment, electrical connection, and potential temperature regulation. In order to improve integration of the battery in terms of volume and mass, a plurality of electrical cells are typically stacked within a battery module along a stacking axis. However, depending on the chemistry of the cells, it is necessary to take into account the possible significant variation in cell thickness along the stacking axis during the charge and discharge cycles, otherwise there is a risk of damaging the cell structure, and even the structure holding the cells. Conventionally, considering the risk of such dimensional changes, foam layers are inserted between the individual cells along the stacking axis, which foam layers allow a degree of deformation. Thus, the foam layer will change as the cells expand and contract, while restoring the pressure provided (return) to conform to the cell structure. However, the mechanical properties of the foam sometimes lead to a significant increase in pressure, which requires an increase in the number of foam layers, thus negatively affecting the overall integration in terms of volume and mass. Furthermore, the mechanical properties of the foam may change as it ages, which may lead to residual deformation of the foam. Disclosure of Invention It is therefore an object of the present invention to provide a battery for storing electrical energy, in particular for an aircraft, which battery is enhanced in terms of integration in terms of volume and mass, while taking into account dimensional changes of the cells during charge and discharge cycles. In particular, a battery module structure is sought that allows for some variation in the thickness of the cells along their stacking axis without the risk of damaging or losing the mechanical integrity of the cells. The invention relates to a battery for storing electrical energy, the battery comprising at least one cell stack and a housing, the housing comprising a base to which the stack of the battery is attached. The battery comprises at least two compression plates arranged on both sides of the stack, means for attaching the compression plates to the base, at least one tie rod capable of pressing the compression plates against the cells of the stack, and at least one elastic device for compensating for the gap of the stack in the direction of dimensional change of the stack, the device comprising at least one flat wire wave spring (flat-WIRE WAVE SPRING). Such a spring increases the compactness of the elastic device. Preferably, each elastic device comprises at least one spring compressed between a pair of support members substantially perpendicular to the direction of dimensional change of the stack. Such elastic dev