# US 2018/0026311 A1 · Method for operating battery cells of a battery, battery and motor vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026311 A1 - Document ID: US20180026311A1 - Status: Published application - Kind: A1 - Application number: 15/548,914 - Filed: 2016-02-11 - Published: 2018-01-25 - Earliest claimed: 2015-02-18 - Assignees: Audi AG - Applicants: Audi AG - Inventors: Michael HINTERBERGER; Berthold HELLENTHAL - Web page: https://patentgrep.com/patent/US20180026311A1 ## CPC - B60L 58/15: Preventing overcharging - B60L 58/13: Maintaining the SoC within a determined range - B60L 58/22: Balancing the charge of battery modules - B60L 58/25: by controlling the electric load - H01M 10/425: {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00)} - H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries} - H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) - H01M 10/482: {for several batteries or cells simultaneously or sequentially} - H01M 10/486: {for measuring temperature} - H01M 50/204: Racks, modules or packs for multiple batteries or multiple cells - H01M 50/578: in response to pressure - H01M 50/581: in response to temperature - B60L 2240/545: Temperature - B60L 2240/547: Voltage - B60L 2240/549: Current - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H01M 2200/00: Safety devices for primary or secondary batteries - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - H02J 7/54: Passive balancing, e.g. using resistors or parallel MOSFETs - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for operating at least two battery cells, which are electrically connected in parallel, of a battery for a motor vehicle. Each of the battery cells is provided with a galvanic element with two electrodes and a battery cell housing for accepting the galvanic element with two connections, and each of the electrodes is electrically coupled to a respective connection of the battery cell. A value of a state variable of each of the battery cells is measured, the values are compared to one another, and when there is a deviation of the values from each other which is outside of a predetermined tolerance range, an electric resistance is adjusted so that the deviation is within the predetermined tolerance range. ## Claims ### Claim at position 1 1-10. (canceled) ### Claim 11 A method for operating at least two battery cells, which are electrically connected in parallel, of a battery for a motor vehicle, wherein each of the battery cells is provided with a galvanic element provided with two electrodes and a battery housing for accepting the galvanic element with two connections, and each of the electrodes is electrically coupled to a respective connection of the battery cell, comprising: each respective value of a state variable of the battery cells is measured, the values of the state variables of the battery cells are compared to one another and when there is a deviation of the mutual values which is outside of a predetermined tolerance range, an electric resistance is adjusted between at least one electrode and one connection of at least one battery cell, so that the deviation is within the predetermined tolerance range. ### Claim 12 (depends on 11) The method according to claim 11, wherein the state variables are an electric current between an electrode and the respective connection of the respective battery cell. ### Claim 13 (depends on 11) The method according to claim 11, wherein the state variable is a temperature inside the battery cell housing of the respective battery cell. ### Claim 14 (depends on 11) The method according to claim 11, wherein the state variable is the charging state of the respective battery cell. ### Claim 15 (depends on 11) The method according to claim 11, wherein an electronic switching element is operated in order to adjust the resistance. ### Claim 16 (depends on 15) The method according to claim 15, wherein in order to adjust the resistance, the electronic switching element is operated in a linear region in which the electronic switching element displays the conduct of an ohmic resistance. ### Claim 17 (depends on 16) The method according to claim 16, wherein in order to adjust the resistance, the electronic switching element is operated in a clocked manner. ### Claim 18 (depends on 17) The method according to claim 17, wherein in order to adjust the resistance, a pulse-width-modulated signal is preset for the electronic switching element of the respective battery cell. ### Claim 19 A battery for a motor vehicle, comprising: two battery cells electrically connected in parallel, wherein each of the battery cells is provided with a galvanic element with two electrodes and a battery cell housing for receiving the galvanic element provided with two connections, and each of the electrodes is electrically coupled to the respective connection of the battery cell, wherein each of the battery cells is provided with at least one sensor device, and the battery is provided with a control device which is adapted to compare the values of the state variable of each of the battery cells to one another and if there is a deviation of the values which is outside of a predetermined tolerance range, to adjust an electric resistance between at least one electrode and at least one of the connections of at least one of the battery cells, so that the deviation is within the predetermined tolerance range.