A hybrid contact plate arrangement (800A; 800B) configured to establish electrical bonds between battery cells (805A; 810A; 815A; 820A; 825A; 830A; 805B; 810B; 815B; 820B) in a battery module (100; 300), comprising: a plurality of contact plates (845A; 850A; 860A; 830B; 835B; 840B) configured to be arranged on a given side of a set of battery cells in the battery module; at least one insulation layer (865A; 845B) configured to provide insulation between each of the plurality of contact plates, wherein the set of battery cells includes a plurality of groups of battery cells (805A, 810A; 815A, 820A; 825A, 830A; 805B, 810B; 815B, 820B), characterised in that: wherein the plurality of contact plates each include first and second primary conductive layers (910, 915) that sandwich a cell terminal connection layer integrally forming a set of bonding connectors (1110; 1115), the sets of bonding connectors being configured to connect to positive and negative terminals of each battery cell among the plurality of groups of battery cells so as to connect battery cells in each of the plurality of groups of battery cells in parallel with each other, and to connect the plurality of groups of battery cells in series with each other, wherein each of the plurality of contact plates include a plurality of holes (920; 1110; 1120) through the first and second primary conductive layers and the cell terminal connection layer that each function as a contact area where a given bonding connector is configured to connect to positive or negative terminals of one or more battery cells, and wherein, for a given hole, the given bonding connector is configured to connect to a sandwiched part of a corresponding cell terminal connection layer inside the given hole at an interior sidewall of the given hole. a plurality of contact plates (845A; 850A; 860A; 830B; 835B; 840B) configured to be arranged on a given side of a set of battery cells in the battery module; at least one insulation layer (865A; 845B) configured to provide insulation between each of the plurality of contact plates, wherein the set of battery cells includes a plurality of groups of battery cells (805A, 810A; 815A, 820A; 825A, 830A; 805B, 810B; 815B, 820B), characterised in that: wherein the plurality of contact plates each include first and second primary conductive layers (910, 915) that sandwich a cell terminal connection layer integrally forming a set of bonding connectors (1110; 1115), the sets of bonding connectors being configured to connect to positive and negative terminals of each battery cell among the plurality of groups of battery cells so as to connect battery cells in each of the plurality of groups of battery cells in parallel with each other, and to connect the plurality of groups of battery cells in series with each other, wherein each of the plurality of contact plates include a plurality of holes (920; 1110; 1120) through the first and second primary conductive layers and the cell terminal connection layer that each function as a contact area where a given bonding connector is configured to connect to positive or negative terminals of one or more battery cells, and wherein, for a given hole, the given bonding connector is configured to connect to a sandwiched part of a corresponding cell terminal connection layer inside the given hole at an interior sidewall of the given hole. wherein the plurality of contact plates each include first and second primary conductive layers (910, 915) that sandwich a cell terminal connection layer integrally forming a set of bonding connectors (1110; 1115), the sets of bonding connectors being configured to connect to positive and negative terminals of each battery cell among the plurality of groups of battery cells so as to connect battery cells in each of the plurality of groups of battery cells in parallel with each other, and to connect the plurality of groups of battery cells in series with each other, wherein each of the plurality of contact plates include a plurality of holes (920; 1110; 1120) through the first and second primary conductive layers and the cell terminal connection layer that each function as a contact area where a given bonding connector is configured to connect to positive or negative terminals of one or more battery cells, and wherein, for a given hole, the given bonding connector is configured to connect to a sandwiched part of a corresponding cell terminal connection layer inside the given hole at an interior sidewall of the given hole.