# US 2026/0100595 A1 · Series-Discharge Parallel-Charge Multi Cell Battery Pack > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100595 A1 - Document ID: US20260100595A1 - Status: Published application - Kind: A1 - Application number: 18/911,016 - Filed: 2024-10-09 - Published: 2026-04-09 - Earliest claimed: 2024-10-09 - Inventors: Bradford T. Hite - Web page: https://patentgrep.com/patent/US20260100595A1 ## CPC - H02J 7/575: {Parallel/serial switching of connection of batteries to charge or load circuit} - H01M 10/052: Li-accumulators - H01M 10/441: {for several batteries or cells simultaneously or sequentially} - H01M 10/46: Accumulators structurally combined with charging apparatus (circuits for charging H02J7/00) - H01M 50/269: Mechanical means for varying the arrangement of batteries or cells for different uses, e.g. for changing the number of batteries or for switching between series and parallel wiring (methods or arrangements for servicing or maintenance H01M6/50, H01M10/42) - H02J 7/40: characterised by the exchange of charge or discharge related data - H02J 7/61: against overcharge - H02J 7/63: against overdischarge - H02J 7/933: {the cycle being controlled or terminated in response to electric parameters} - H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing} - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY ## Abstract A unique system for the implementation of a multi cell battery pack whereby the individual cells are organized in different configurations for discharge or charging operation is presented. Battery pack discharge operation utilizes a series (stacked) configuration capable of producing a high output voltage necessary for the application. In contrast, charging operation configures the individual cells into a parallel (single layer) organization offering a simple fast charge operation provided by natural current sharing of the cells. Switch over between the two configurations is achieved using switching array implemented by low-cost N-channel MOSFET devices. Usage of dual modes for battery charge/discharge operation offers a simplified implementation with the highest performance. An application is also described where the present invention is used as a compatible replacement of a standard 12V lead acid automotive battery. ## Claims ### Claim 1 A battery pack having a positive terminal and a negative terminal comprising: a. at least two or more lithium-based rechargeable cells or cell arrays coupled to a switch matrix, the group of lithium-based rechargeable cells or cell arrays storing electrical energy; b. a charger circuit coupled to the switch matrix and the battery pack terminals, the charger circuit generating a charging current; c. a control circuit coupled to the switch matrix, the control circuit selecting the switch matrix configuration for charge or discharge operation; d. wherein the switch matrix can be configured to connect the lithium-based rechargeable cells or cell arrays in a parallel connection during charge operation; and e. wherein the switch matrix can be configured to connect the lithium-based rechargeable cells or cell arrays in a series connection during discharge operation. ### Claim 2 (depends on 1) The system of claim 1, wherein a safety monitoring circuit can isolate the positive terminal for unsafe conditions of over-charge or over-discharge. ### Claim 3 (depends on 1) The system of claim 1, wherein the control circuit selection between charge and discharge operation is based on detection of an external charge voltage. ### Claim 4 (depends on 1) The system of claim 1, wherein the control circuit selection between charge and discharge operation is based on an external discrete input signal. ### Claim 5 (depends on 1) The system of claim 1, wherein the control circuit selection between charge and discharge operation is based on reception of a software message via CAN bus. ### Claim 6 A method of configuring cells or cell arrays within a battery pack comprising: a. storing electrical energy in at least two or more lithium-based rechargeable cells or cell arrays; b. generating switch matrix control information by a control circuit; c. selecting battery pack charge or discharge operation by a switch matrix in response to switch matrix control information; d. configuring the lithium-based rechargeable cells or cell arrays in a series connection during battery pack discharge operation; e. configuring the group of lithium-based rechargeable cells or cell arrays in a parallel connection during battery pack charge operation; and f. generating a charging current by a charging circuit during battery pack charge operation. ### Claim 7 (depends on 6) The method of claim 6, further comprising of monitoring charge and discharge operation by a safety circuit to isolate the positive terminal for unsafe conditions of over-charge and over-discharge. ### Claim 8 (depends on 6) The method of claim 6, further comprising of selecting between charge and discharge operation by a control circuit based on detection of an external charge voltage. ### Claim 9 (depends on 6) The method of claim 6, further comprising of selecting between charge and discharge operation by a control circuit based on an external discrete input signal. ### Claim 10 (depends on 6) The system of claim 6, further comprising of selecting between charge and discharge operation by a control circuit based on reception of a software message via CAN bus.