Battery pack and treatment system

Patent metadata

Field	Value
Publication number	US-11600869-B2
Application number	US-202016870153-A
Country	US
Kind code	B2
Filing date	May 8, 2020
Priority date	May 10, 2019
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A battery pack supplies an electrically driven treatment apparatus with an electric driving power and includes: a first stack limiting structure and a second stack limiting structure, wherein the second stack limiting structure is disposed opposite and with a fixed distance to the first stack limiting structure; a plurality of pouch cells, wherein the pouch cells are disposed in a stack, wherein the stack is disposed between the first stack limiting structure and the second stack limiting structure and a height of the stack in a stack direction is limited by the first stack limiting structure and the second stack limiting structure; and a sensor arrangement. The sensor arrangement is disposed in the stack. The sensor arrangement extends across a major part of a surface of the pouch cells and is configured such that the height of the stack across the extension is approximately equal. The sensor arrangement has a pressure sensor. The pressure sensor is configured for detecting a pressure force acting in the stack direction on the pouch cells.

First claim

What is claimed is:

1. A battery pack for supplying an electrically driven treatment apparatus with an electric driving power, the battery pack comprising:
a first stack limiting structure and a second stack limiting structure, wherein the second stack limiting structure is disposed opposite and with a fixed distance to the first stack limiting structure;
a plurality of pouch cells, wherein the pouch cells are disposed in a stack, wherein the stack is disposed between the first stack limiting structure and the second stack limiting structure and a height of the stack in a stack direction is limited by the first stack limiting structure and the second stack limiting structure; and
a sensor arrangement, wherein the sensor arrangement is disposed in the stack, wherein the sensor arrangement extends with a constant thickness across a major part of a surface of the pouch cells and is configured such that the height of the stack across the sensor arrangement is approximately equal, and wherein the sensor arrangement has a pressure sensor, wherein the pressure sensor is configured for detecting a pressure force acting in the stack direction on the pouch cells, and wherein the major part of the surface is at least 70% of the surface,
wherein
the sensor arrangement has a compensation spacer,
the compensation spacer is disposed in the stack,
the compensation spacer is separate from the pressure sensor, and
the compensation spacer has a sensor recess, wherein the pressure sensor is disposed in the sensor recess, wherein a spacer thickness of the compensation spacer and a sensor thickness of the pressure sensor in the stack direction are approximately equal.

2. The battery pack according to claim 1 , wherein
the compensation spacer has a one-piece design.

3. The battery pack according to claim 1 , wherein
the sensor arrangement includes a film.

4. The battery pack according to claim 1 , wherein
the sensor arrangement has a temperature sensor, and
the temperature sensor is configured for measuring a temperature of the stack.

5. The battery pack according to claim 4 , wherein at least one of:
the sensor arrangement is disposed between two pouch cells, and
the pressure sensor and/or the temperature sensor are/is disposed in a center of the surface of the pouch cells.

6. The battery pack according to claim 5 , the battery pack further comprising:
an outer temperature sensor, wherein the outer temperature sensor is disposed and configured for measuring an outer temperature of the stack outside the stack at an edge of the stack, the first stack limiting structure or the second stack limiting structure, and/or outside the first stack limiting structure or the second stack limiting structure.

7. The battery pack according to claim 6 , the battery pack further comprising:
a control device, wherein the control device is configured to control the battery pack in response to the detected pressure force, the measured temperature and/or the measured outer temperature.

8. The battery pack according to claim 7 , the battery pack further comprising:
a power output and/or power input detection device, wherein the power output and/or power input detection device is configured for detecting the output electric driving power and/or an input electric charging power over time,
wherein the control device is configured for comparison of the detected pressure force and/or a quantity based on the detected pressure force to a variable pressure limit value and for controlling the battery pack in response to a result of the comparison, wherein the control device is configured for varying the pressure limit value in response to the detected output driving power and/or the detected input charging power over the time.

9. The battery pack according to claim 1 , the battery pack further comprising:
at least one buffer element, wherein the at least one buffer element is disposed in the stack, wherein the at least one buffer element extends across a major part of the surface of the pouch cells and is configured to buffer inflating of the pouch cells in the stack direction across a buffer thickness of the at least one buffer element.

10. The battery pack according to claim 1 , the battery pack further comprising:
a stack housing, wherein the first stack limiting structure is a first housing wall of the stack housing, and the second stack limiting structure is a second housing wall of the stack housing.

11. The battery pack according to claim 1 , wherein at least one of
the battery pack has a maximum electric driving power of a minimum of 1 kW and/or of a maximum of 10 kW,
the battery pack has a nominal voltage of a minimum of 10 V and/or of a maximum of 100 V,
the battery pack has a maximum energy content of a minimum of 100 Wh and/or of a maximum of 1000 Wh,
the battery pack has a mass of a minimum of 0.5 kg and/or of a maximum of 10 kg, and
the battery pack has a height of a minimum of 2.5 cm and/or of a maximum of 10 cm, a width of a minimum of 5 cm and/or of a maximum of 20 cm, and a depth of a minimum of 7.5 cm and/or of a maximum of 30 cm.

12. A treatment system, comprising:
a battery pack according to claim 1 ; and
an electrically driven treatment apparatus,
wherein the battery pack and the treatment apparatus are configured for electrical connection with each other for supplying the treatment apparatus with electric driving power from the battery pack.

13. The treatment system according to claim 12 , wherein
the treatment apparatus has a battery accommodation, and
the battery accommodation is configured for accommodating the battery pack.

14. The treatment system according to claim 12 , wherein the treatment apparatus is one of:
a saw, a pole pruner, a clearing saw, a brush cutter, hedge shears, a hedge cutter, a blower device, a leaf blower, a lopper, a cutoff grinder, a sweeper device, a sweeper roller, a sweeper brush, a lawn mower, a dethatcher or a grass trimmer.

Assignees

• Stihl Ag & Co Kg Andreas
• Murata Manufacturing Co

Inventors

• Sauerteig Daniel
• Scholl Julien
• Ozawa Kenichi
• Sato Takayuki
• Misawa Daiki
• Kono Yosuke
• Kuratsuka Masaki

Classifications

• H01M50/569

  Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals (battery terminal connectors with integrated measuring arrangements G01R31/364) · CPC title

• H01M10/486

  for measuring temperature · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/6235

  Power tools · CPC title