SE511309C2 - Activatable battery in mine and depth charge - Google Patents

Abstract

The battery (1) is axially activated, and in its casing (2) is an ampoule (3) contg. electrolyte (4) and placed on a holder (5). In the bottom of the casing is a cell space (6) comprising a single cell. Between the cell space and the ampoule holder is a plate (7) which with a conical part of the casing forms a passage between the ampoule and the cell space. The passage comprises channels (8) which are narrow to prevent crushed glass from the ampoule following the electrolyte through them. Beneath the plate is a membrane (10) which is suspended from it by a spring (11). Before and after acceleration of the battery, the spring holds the membrane in tight contact with the plate and casing so that the passage between the ampoule space and cell space is closed, whilst the spring under the effect of axial acceleration forces holds the passage between the ampoule space and the cell space open. The cell space is closed at the top against the membrane by a cover (12) of e.g. sintered polyethene with a filtering function.

Description

15 20 25 30 511 309 2 The purpose of the invention is to provide a battery which is simple in its construction and which exhibits high functional reliability. The battery according to the invention is characterized in that the closing member comprises a membrane which is resiliently designed, which membrane opens and closes the passage depending on the movement of the battery.

The invention achieves a battery that is possible to manufacture at low cost and which, after activation, can function for a long time. According to an advantageous embodiment, the battery according to the invention is characterized in that the closing means is designed to open and close the passage depending on the axial acceleration of the battery. By this embodiment, the battery according to the invention is characterized in that the closing means is designed to open and close the passage depending on the axial acceleration of the battery.

By this embodiment a battery is provided which does not require the ammunition in which the battery is mounted to be rotated, but the axial acceleration is used for transferring the electrolyte from the electrolyte vial to the cell spaces. When the axial acceleration ceases, the battery remains charged for a long time thanks to the closure means. No rotation of the ammunition is required either.

According to another advantageous embodiment of the battery, the closing means is designed to open and close the passage depending on the rotation of the battery. This type of battery is intended for ammunition that is pushed away by rotation. The cell spaces are filled with electrolyte during the rotation by the closing means thereby keeping the passage of electrolyte to the cell spaces open. The cells remain filled and activated even after the rotation has ceased, since the closing means thereby closes the passage to the cell spaces.

The invention will be described in more detail below with reference to the accompanying drawings, in which fi g_l shows an embodiment of an acceleration-activated battery in a rotationally symmetrical section, _fi_ g2 schematically illustrates the construction of a single cell in vertical section, fi g 2a, and horizontally shows 2, and fi g 2b, fi g an embodiment of an axial acceleration and rotation activated battery in section through the rotation center.

The axially activated battery 1 shown in Fig. 1 comprises a housing 2 enclosing an ampoule 3 with electrolyte 4. The ampoule 3 is placed on an ampoule holder 5. At the bottom of the housing 2 there is a cell space 6 which in the shown embodiment consists of a single cell. Between the cell space 6 and the ampoule holder 5 a plate 7 is arranged. The plate together with a confusing part of the casing 2 forms a passage between the ampoule 3 and the cell space 6. The passage consists of channels 8, which can be made narrow to prevent broken glass from the ampoule 3 from following the electrolyte 4 through the channels 8.

In the embodiment shown, the channels are formed by elevations 9 arranged on the plate 7 which connect to the conical part of the battery housing 2. Under the plate 7 a membrane 10 is resiliently suspended in the plate 7 by means of a spring 11. Before and after the acceleration of the battery the spring 11 keeps the membrane 10 in close contact with the plate 7 and the housing 2, so that the passage between the furnace pull space and the cell space is closed, while the spring 11 under the action of the axial acceleration crane, the dimension is so dimensioned that the passage between the cocoon space and the cell space is kept open. The cell space 6 is terminated at the top towards the membrane by a lid 12 of, for example, sintered polyethylene with a filtering function.

The structure of a single cell shown in Figures 2a and b comprises a jacket 21 of lead in the center of which a carbon rod or carbon wires 24 are arranged. Between the jacket 21 of lead and the carbon rod 24 a separator 22 and a powder of lead dioxide 23 are arranged in said order from the jacket 21. The described structure provides a long service life in the activated state and opportunities for relatively high power outlets.

When the battery shown in fi g l is subjected to axial acceleration in connection with the ammunition in which the battery is mounted being pushed away, the ampoule is crushed with electrolyte 3 with the participation of the holder. The ampoule preferably consists of glass and contains, for example, an electrolyte in the form of or uor and boric acid. Upon acceleration of the battery, the ampoule will press an upper plate 13 of the ampoule holder against a lower plate 14, whereby an intermediate plate 15 penetrates and crushes the ampoule. The ampoule holder construction is described in more detail in SE patent 7711701-8. By the force, the acceleration, the electrolyte is then driven through the channels 8 past the membrane open by the acceleration down into the cell space. When the axial acceleration ceases, the diaphragm closes and a battery cell is created which inger acts for a long time. The lu fi that is originally present is forced over to the ampoule compartment during the above 10 15 20 25 30 511509 4. Thus, no significant pressure differences exist when the membrane closes the passage again.

The battery shown in Figure 3 is activated by axial acceleration in combination with rotation of the battery. Elements in Fig. 3 that have the equivalent in Fig. 1 have been given the same reference numerals.

The ampoule compartment with ampoule holder is of the same construction as described with reference to fi g 1 and will not be described further here. The ampoule compartment is located in the rotation center of the battery, which center is marked by the axis of rotation 16. The cell space is located radially out of the ampoule compartment. Between the ampoule cavity and the cell cavity, a resilient membrane 10 of, for example, rubber is suspended in a plate 7. The plate 7 is connected to a wall 17 which separates the ampoule and the cell spaces.

In connection with the membrane 10 and the plate 7, a lid 12 of, for example, sintered polyethylene is arranged. As in the embodiment according to fi g 1, the cover 12 has an filtering function.

Upon activation of the battery, the electrolyte is released due to the axial acceleration in the same manner as described with reference to ñg 1. By rotating the battery, the membrane 10 is opened and the electrolyte is forced out towards the cell space. When the rotation ceases, the membrane again closes the passage between the amplitude space and the cell space.

The resilient membrane 10 is so designed and dimensioned that it closes tightly between the armpit outer tube and the cell outer ring in the absence of rotational movement. When the battery is subjected to rotation, the peripheral parts of the membrane 10 bend towards the cell space and a free passage occurs between the ampoule space and the cell space.

The invention is in no way limited to the embodiments described above, but within the scope of the invention there are a number of variants. For example, the cell space does not have to consist of a single cell, but may just as well comprise several cells.

Claims (6)

10 15 20 25 30 5 511 309 Patent claims Activatable battery (1) comprising ampoule (3) with electrolyte (4), holder (5) for the ampoule, at least one activatable cell (6) and a passage (8) with closing means (10) between the space in which the ampoule (3 ) is located and the cells (6), which closure means (10) before and after the activation of the battery keeps the passage (8) closed, while said closure means (10) during the activation of the battery (1) keeps the passage (8) open so that electrolyte (4) can flow from the ampoule (3) to the cells (6), characterized in that the closing means comprises a membrane which is resiliently suspended or is resiliently designed, which membrane opens and closes the passage (8) depending on the movement of the battery. Activatable battery according to claim 1, characterized in that the resiliently suspended membrane included in the closing member (10) is rigidly designed. Activatable battery according to one of Claims 1 to 2, characterized in that the closing means (10) is designed to open and close the passage (8) in dependence on the axial acceleration of the battery (1). Activatable battery according to one of Claims 1 to 2, characterized in that the closing means (10) is designed to open and close the passage (8) in dependence on the rotation of the battery (1). Activatable battery according to claim 4, characterized in that the ampoule space adjacent to the cell space (6) has a sloping wall shape to facilitate the transport of the electrolyte (4) to the cell space. Activatable battery according to one of the preceding claims, characterized in that filtering means (12) are arranged in connection with the closing means (10) in order to prevent electrolyte contamination, for example glass breakage from the ampoule, from reaching the closing means.