WO2017001120A1

WO2017001120A1 - Battery sub-module and battery system

Info

Publication number: WO2017001120A1
Application number: PCT/EP2016/061647
Authority: WO
Inventors: Simon Obergfaell; Ionut Marian LICA; Thomas Klemen; Seyed Mohammad Seyed Abbassi; Ralf Oswald
Original assignee: Robert Bosch Gmbh
Priority date: 2015-06-30
Filing date: 2016-05-24
Publication date: 2017-01-05
Also published as: DE102015212241A1

Abstract

The invention relates to a battery sub-module (70) comprising a plurality of battery cells (2) in a housing (72) as well as a control module (74) for controlling and monitoring the battery cells (2). According to the invention, there is a number of similar reception zones (90), each of which (90) is designed to receive one battery cell (2) and the control module (74), the control module (74) being arranged in one of the reception zones (90). The invention also relates to a battery system comprising at least one disclosed battery sub-module.

Description

description

Title battery submodule and battery system

The invention relates to a Batteriesubmodul, which comprises a plurality of arranged in a housing battery cells and a control module for controlling and

Monitoring the battery cells includes, as well as a battery system comprising at least one Batteriesubmodul.

State of the art

Electrical energy can be stored by means of batteries. Batteries convert chemical reaction energy into electrical energy. Here are

Primary batteries and secondary batteries distinguished. Primary batteries are only functional once, while secondary batteries, also referred to as accumulators, are rechargeable. A battery comprises one or more battery cells.

In particular, so-called lithium-ion battery cells are used in an accumulator. These are characterized among other things by high energy densities, thermal stability and extremely low self-discharge. Lithium-ion battery cells are used inter alia in motor vehicles, in particular in electric vehicles (electric vehicle, EV), hybrid vehicles

(Hybrid Electric Vehicle, H EV) and plug-in hybrid electric vehicles (PHEV) are used.

A generic battery cell is disclosed for example in DE 10 2012 217 451 AI. The battery cell has a cell case, which

for example, is made of a metal. The cell housing is prismatic, in particular cuboid, designed and pressure-resistant. The

Battery cell has a positive terminal and a negative terminal for electrical contact. Several battery cells are combined to form a battery submodule and electrically interconnected. For this purpose, the battery cells are arranged in a common housing, and the terminals of the battery cells are connected to each other by means of cell connectors. Several battery submodules are combined into one battery system. To control and

Monitoring the battery cells are provided control modules.

From US 2012/068668 Al a battery module for a vehicle is known which comprises a plurality of battery cells and control modules.

In US 2014/272501 AI a battery module for a vehicle is disclosed, which comprises a plurality of battery cells. Furthermore, control modules are provided, which are arranged in the same housing as the battery cells.

Also, the CN 102903876 A discloses a battery module for a vehicle having a plurality of battery cells. In this case, a control module is arranged in the same housing as the battery cells.

From US 2014/141287 AI a battery module is known which comprises a plurality of arranged in a housing battery cells. The housing has an opening for receiving a control module.

The CN 203406354 U shows a battery module with a housing. On the housing of the battery module, a high-voltage control module is attached laterally.

Disclosure of the invention

It is a Batteriesubmodul proposed which several in one

Housing arranged battery cells and a control module for controlling and monitoring the battery cells comprises.

According to the invention, a number of similar receiving areas is provided, each of the receiving areas for receiving one each Battery cell is set up and for receiving the control module. In this case, the control module is arranged in one of the receiving areas. The battery cells are arranged in the other receiving areas. The number of

Battery cells is thus one less than the number of intended receiving areas.

Advantageously, the control module has at least approximately the same

Dimensions like each of the battery cells on. This allows each of the

Accommodate receiving areas either the control module or one of the battery cells.

According to an advantageous embodiment of the invention are all

Receiving areas arranged within the housing. Thus, the control module is disposed within the housing.

According to an advantageous embodiment of the invention are all

Receiving areas arranged within the housing, wherein one of the receiving areas of the other receiving areas, in particular by a partition, is separated. The control module is preferably arranged in the receiving area, which is separated from the other receiving areas. Although the control module is thus disposed within the housing, but separated from the other battery cells, in particular by the partition. According to another advantageous embodiment of the invention is one of

Receiving areas arranged outside of the housing, while the remaining receiving areas are arranged within the housing. The control module is preferably arranged in the receiving area, which is arranged outside the housing. The control module is thus arranged outside the housing and is separated from the battery cells, for example by an outer wall of the housing.

Preferably, the receiving areas are arranged in a common plane. Preferably, the receiving areas are in at least one row

arranged. In this case, a plurality of rows of receiving areas are preferably arranged next to one another. Each row has several recording areas. The number of receiving areas of the battery submodule is then a product of the number of rows and the number of receiving areas per row.

A battery system is also proposed which comprises at least one battery submodule according to the invention.

A battery submodule according to the invention and a battery system according to the invention advantageously find use in an electric vehicle (EV), in a hybrid vehicle (HEV), in a plug-in hybrid vehicle (PH EV), in a stationary battery or in a battery in a marine application.

Advantages of the invention

By integrating the control module in the battery submodule reduces the required space of a battery system, which several

Batteriesubmodule having battery cells and control modules has. This also increases the energy density of the battery system.

In the arrangement of the control module within the housing of the

Battery submodule results in a compact design. Furthermore, the control module is protected by walls of the housing against external influences, in particular against externally acting forces.

An arrangement of the control module outside the housing of the

Battery submodule allows a relatively simple replacement of the control module, wherein an opening of the housing in which the battery cells are arranged, is not required. Furthermore, the control module is protected by an outer wall of the housing against a force by the battery cells. Namely, the battery cells expand depending on

Temperature and state of charge and thereby exert a force on adjacent elements. Brief description of the drawings

Embodiments of the invention will be explained in more detail with reference to the drawings and the description below.

FIG. 1 shows an exploded view of a battery cell,

FIG. 2 shows a plan view of a first embodiment of a

Batteriesubmoduls,

Figure 3: a plan view of a second embodiment of a

Battery submodule and Figure 4: a plan view of a third embodiment of a

Batteriesubmoduls.

EMBODIMENTS OF THE INVENTION In the following description of embodiments of the invention, the same or similar elements will be denoted by the same reference numerals, and a repeated description of these elements will be omitted in individual cases. The figures illustrate the subject matter of the invention only schematically.

A battery cell 2 shown in FIG. 1 comprises a cell housing 11, which is prismatic, in the present case cuboidal. The

Cell housing 11 is embodied electrically conductive and made of aluminum, for example. The cell housing 11 comprises a cuboid container 13, which has a container opening 14 on one side. The

Container opening 14 is closed by a cover assembly 15, which includes, among other things, a cover plate 23. The cuboid container 13 and the cover plate 23 of the cell housing 11 are each made electrically conductive and made of aluminum, for example. The battery cell 2 comprises a negative terminal 21 and a positive terminal 22. Via the terminals 21, 22, a voltage provided by the battery cell 2 can be tapped off. Furthermore, the battery cell 2 can also be charged via the terminals 21, 22. The terminals 21, 22 are spaced from each other on the cover plate 23 of the prismatic cell housing 11.

Within the cell housing 11 of the battery cell 2, an electrode winding 3 is arranged, which has two electrodes, namely an anode 5 and a cathode not visible in this illustration. The anode 5 and the cathode are each designed like a foil and wound with the interposition of a separator not visible in this representation to the electrode winding 3. The separator is electrically insulating, but ionically conductive, so for

Lithium ions permeable.

The anode 5 comprises an anodic active material, which is designed like a foil. The anodic active material has as a base silicon or a silicon-containing alloy. The anode 5 further comprises a current conductor 4, which is also formed like a foil. The anodic active material and the current collector 4 of the anode 5 are placed flat against each other and connected to each other. The current collector 4 of the anode 5 is made electrically conductive and made of a metal, such as copper. The current collector 4 of the anode 5 is on a first narrow side over an edge of the

Electrode coil 3 via and is connected to a first collector 7. Via the first collector 7, the current conductor 4 of the anode 5 is electrically connected to the negative terminal 21 of the battery cell 2.

The cathode comprises a cathodic active material, which is designed like a film. The cathodic active material has as a base material a metal oxide, for example lithium cobalt oxide (UC0O2). The cathode further comprises a current conductor, which is likewise formed like a foil. The

cathodic active material and the current conductor are laid flat and connected to each other. The current collector of the cathode is made electrically conductive and made of a metal, for example aluminum. The current collector of the cathode is on a second narrow side, which is the the first narrow side opposite, over an edge of the electrode coil 3 and is connected to a second collector 9. Via the second collector 9, the current collector of the cathode is electrically connected to the positive terminal 22 of the battery cell 2.

The first collector 7, which is located inside the cell housing 11, is connected by means of a first contact arrangement 18 to the negative terminal 21, which is located outside the cell housing 11. The second collector 9, which is located inside the cell housing 11, is connected by means of a second contact arrangement 19 to the positive terminal 22, which is located outside the cell housing 11.

The cell case 11 of the battery cell 2 is filled with a liquid electrolyte. The electrolyte surrounds the anode 5, the cathode and the separator. The electrolyte is also ionically conductive. The electrolyte is filled after assembly of the cell housing 11 through a filling opening 26 in the cover plate 23 into the cell housing 11. Thereafter, the filling opening 26 is closed by means of a sealing plug, not shown.

The first collector 7 is connected to a first connecting bolt 61, which projects away from the first collector 7 on a side remote from the electrode winding 3. The first connection pin 61 projects through a first cover opening 24 in the cover plate 23 of the cover arrangement 15 and is connected to the negative terminal 21 at its end facing away from the first collector 7.

The second collector 9 is connected to a second connecting bolt 62, which projects away from the second collector 9 on a side facing away from the electrode winding 3 side. The second connecting bolt 62 protrudes through a second cover opening 25 in the cover plate 23 of the cover assembly 15 and is connected at its end facing away from the second collector 9 with the positive terminal 22.

In the present case, the cover assembly 15 comprises a potential plate 17, which is designed to be electrically conductive, and which is disposed between the cover plate 23 and the negative terminal 21 is arranged. The potential plate 17 electrically connects the cover plate 23 to the negative terminal 21. Thus, that is

Cell housing 11 at the same electrical potential as the negative terminal 21st

The lid assembly 15 further includes a connection plate 32, which is also made electrically conductive, and which is disposed between the cover plate 23 and the positive terminal 22. The connection plate 32 is electrically connected to the positive terminal 22. On the side facing away from the cover plate 23 of the connecting plate 32, laterally next to the positive

Terminal 22, a connection plate insulation 35 is also attached, glued here.

Between the cover plate 23 and the connecting plate 32 is a

Spacer insulator 40 is provided, which the cover plate 23 electrically from the

Connection plate 32 and the positive terminal 22 isolated. Of the

Spacer insulator 40 has a passage opening 44, which is penetrated by the second connecting bolt 62. The lid assembly 15 also includes a Deckenplattenisolierfolie 36, which is glued on the side facing away from the container 13 of the cover plate 23. The Deckenplattenisolierfolie 36 has a first film opening 37, which is penetrated by the negative terminal 21 and the potential plate 17. The Deckenplattenisolierfolie 36 also has a second film opening 38, whose function will be discussed later. The ceiling panel insulating sheet 36 also has a third sheet opening 39 which is separated from the positive terminal 22, the connection plate 32, the connection plate insulation 35 and the

Distance insulator 40 is penetrated. Between the cover plate 23 and the first collector 7 is a first

Terminal insulator 46 is provided, which electrically isolates the cover plate 23 from the first collector 7. The first connection insulator 46 has a first insulator opening 56, which passes through the first connection pin 61.

Between the cover plate 23 and the second collector 9 is a second

Terminal insulator 47 is provided, which the cover plate 23 electrically from the second collector 9 isolated. The second connection insulator 47 has a second insulator opening 57, which passes through the second connection bolt 62.

A first sealing ring 51 is arranged between the first connecting bolt 61 and the cover plate 23. The first sealing ring 51 is the first

The first sealing ring 51 electrically isolates the first terminal pin 61 from the cover plate 23. In addition, the first sealing ring 51 seals the first cover opening 24 airtight and liquid-tight. Thus, in particular a penetration of moisture through the first cover opening 24 in the

Cell housing 11 into it, and leakage of electrolyte through the first cover opening 24 from the cell housing 11 prevented out.

A second sealing ring 52 is arranged between the second connecting bolt 62 and the cover plate 23. The second sealing ring 52 is placed around the second connecting bolt 62 and is located in the second cover opening 25 of the cover plate 23. The second sealing ring 52 insulates the second

Connecting bolt 62 electrically from the cover plate 23. In addition, the second sealing ring 52 seals the second cover opening 25 airtight and liquid-tight. Thus, in particular, a penetration of moisture through the second

Deck opening 25 into the cell housing 11 into it, and leakage of electrolyte through the second cover opening 25 from the cell housing 11 prevented out.

The cover plate 23 of the cell housing 11 further comprises a bursting opening 33, which is closed by a rupture disk 34. In the case of an overpressure inside the cell housing 11, the rupture disk 34 opens, as a result of which the overpressure can escape through the bursting opening 33 to the outside. As a result, bursting of the cell housing 11 is prevented. The burst opening 33 in the cover plate 23 is aligned with the second film opening 38 in the

Ceiling panel insulating film 36.

The battery cell 2 in the present case also has an overcharge protection device (Overcharge Safety Device, OSD). The overcharge protection device comprises an OSD device provided in the cover plate 23 of the cell housing 11. Opening 29, which is closed by an OSD membrane 28. The OSD membrane 28 is designed as a thin metal foil. In the case of an overpressure within the cell housing 11, which for example by a

Temperature rise may occur due to an overcharge of the battery cell 2, deforms the OSD membrane 28 and touches the connecting plate 32nd

The spacer insulator 40 has for this purpose a short-circuit opening 42, which can pass through the OSD membrane 28 during a deformation. This creates a short circuit between the cell housing 11 and the second collector 9, whereby a charging of the battery cell 2 is interrupted.

FIG. 2 is a plan view of a first embodiment of a

Battery submodule 70 shown.

The battery submodule 70 comprises a plurality of, in the present case eleven, battery cells 2, which are arranged within a housing 72. The terminals 21, 22 of the

Battery cells 2 are electrically connected to each other by means of cell connectors 80. Furthermore, the battery submodule 70 comprises a control module 74 for controlling and monitoring the battery cells 2. The control module 74 has approximately the same dimensions as a battery cell 2.

In the present case, the battery submodule 70 has twelve receiving areas 90 for accommodating one battery cell 2 each and the control module 74. The twelve receiving areas 90 are formed identically. That is, each of the receiving areas 90 may selectively receive the control module 74 or one of the battery cells 2.

The control module 74 is arranged in one of the twelve receiving areas 90, and the eleven battery cells 2 are arranged in the remaining eleven receiving areas 90. The number of battery cells 2 is thus one less than the number of receiving areas 90 provided.

The receiving areas 90 are present in two rows 82 to six

Receiving areas 90 arranged. The two rows 82 are arranged directly next to each other. The receiving areas 90 are arranged in a common plane. The number of receiving areas 90 of the battery submodule 70, here twelve, is a product of the number of rows 82, in the present case two, and the number of receiving areas 90 per row 82, in the present case six.

Of course, arrangements with a different number of rows 82 and with a different number of receiving areas 90 per row 82 are conceivable.

In the first embodiment of the battery submodule 70 are all

Receiving areas 90 disposed within the housing 72. Thus, the control module 74 is disposed within the housing 72.

In Figure 3 is a plan view of a second embodiment of a

Battery submodule 70 shown. The second embodiment of the

Battery submodule 70 is largely similar to the first embodiment of the battery submodule 70.

Deviating from the first embodiment of the battery submodule 70, however, the second embodiment of the battery submodule 70 additionally has a partition wall 78, which is arranged within the housing 72. The dividing wall 78 separates one of the receiving areas 90 from the remaining eleven receiving areas 90.

The control module 74 is arranged in the receiving area 90, which is separated from the remaining eleven receiving areas 90. Although the control module 74 is thus disposed within the housing 72, the control module 74 is separated from the eleven battery cells 2 by the partition wall 78.

In Figure 4 is a plan view of a third embodiment of a

Battery submodules70. The third embodiment of the battery submodule 70 largely equals the first embodiment of the battery submodule 70.

Deviating from the first embodiment of the battery submodule 70, however, in the third embodiment of the battery submodule 70 one of the Receiving areas 90 arranged outside of the housing 72. The housing 72 has a plan deviating from a rectangle. An outer wall 76 of the housing 72 separates the receiving area 90 arranged outside the housing 72 from the remaining eleven receiving areas 90, which are arranged within the housing 72.

The control module 74 is arranged in the receiving region 90, which is arranged outside of the housing 72. The control module 74 is thus arranged outside the housing 72 and is separated from the eleven battery cells 2 by the outer wall 76.

The invention is not limited to the embodiments described herein and the aspects highlighted therein. Rather, within the scope given by the claims a variety of modifications are possible, which are within the scope of expert action.

Claims

claims

1. Battery submodule (70) comprising

a plurality of battery cells (2) arranged in a housing (72) and a control module (74) for controlling and monitoring the

Battery cells (2),

characterized in that

a number of similar receiving areas (90) is provided, wherein

each of the receiving areas (90) is adapted to receive a respective battery cell (2) and to receive the control module (74), and in that the control module (74) is arranged in one of the receiving areas (90).

2. Batteriesubmodul (70) according to claim 1, characterized in that the control module (74) has at least approximately the same dimensions as each of the battery cells (2).

3. Battery submodule (70) according to one of the preceding claims,

characterized in that

all receiving areas (90) within the housing (72) are arranged.

4. Batteriesubmodul (70) according to claim 3, characterized in that one of the receiving areas (90) from the other receiving areas (90) is separated.

5. Batteriesubmodul (70) according to one of claims 1 to 2, characterized

marked that

one of the receiving areas (90) outside the housing (72) is arranged, and that the remaining receiving areas (90) within the housing (72) are arranged.

6. Batteriesubmodul (70) according to any one of the preceding claims, characterized in that

the receiving areas (90) are arranged in a common plane.

7. Battery submodule (70) according to one of the preceding claims,

characterized in that

the receiving areas (90) are arranged in at least one row (82).

8. Batteriesubmodul (70) according to claim 7, characterized in that a plurality of rows (82) of receiving areas (90) are arranged side by side.

9. Battery system, comprising at least one Batteriesubmodul (70) according to any one of the preceding claims.

10. Use of a Batteriesubmoduls (70) according to any one of claims 1 to 8 and / or a battery system according to claim 9 in one

Electric vehicle (EV), in a hybrid vehicle (H EV), in a plug-in hybrid vehicle (PH EV), in a stationary battery or in a marine application battery.