CATL Patente

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The present application provides a heat exchange assembly, a case, a battery and an electric apparatus. The heat exchange assembly comprises a heat exchange piece, a current collecting piece and a sleeve; the heat exchange piece is provided with a flow channel extending in a first direction; the current collecting piece being arranged at the two ends of the heat exchange piece in the first direction, the current collecting piece is provided with fluid inlets/outlets, and the fluid inlets/outlets leading to the flow channel; the sleeve is mutually sleeved on at least one of the heat exchange piece and the current collecting piece, and is connected to the heat exchange piece and the current collecting piece. The heat exchange assembly provided by the present application helps to improve the connection strength of the current collecting piece and the heat exchange piece and the overall structural strength of the heat exchange assembly, thereby helping to improve the reliability of batteries.

Provided in the present application is a cell formation method, comprising the following steps: dividing cells into a control sample cell and a cell to be tested; subjecting the control sample cell to electrolyte filling and standing, then performing formation with an injection port being in an open state, and on the basis of the amount of gas generated during the formation process of the control sample cell and the charging SOC of the control sample cell, constructing a gas production curve of formation; dividing the obtained curve into three consecutive segments, wherein the cumulative amount of gas generated during the formation process corresponding to a first segment of the curve accounts for 1% of the total gas amount of the formation process, the cumulative amount of gas generated during the formation process corresponding to a third segment of said curve accounts for 1% of the total gas amount of the formation process, the charging SOC of the cell corresponding to a connection point between the first segment of said curve and a second segment of said curve is taken as a gas production initial SOC, and the charging SOC of the cell corresponding to a connection point between the second segment of said curve and the third segment of said curve is taken as a gas production cutoff SOC; and on the basis of the gas production charging SOC and the gas production cutoff SOC, performing formation on the cell to be tested that has been subjected to electrolyte filling and standing.

An electrolyte for lithium metal battery, a lithium metal battery, a battery, and an electric apparatus are provided. The electrolyte for lithium metal battery includes a main solvent, a diluent, and a lithium salt, where a molar concentration of the lithium salt is 1 mol/L to 4 mol/L, and a viscosity of the electrolyte is less than or equal to 5.5 mPa·s. This can improve cycling performance of a lithium metal battery.

Disclosed in the present application are a monitoring method for an energy storage apparatus, and an electric apparatus and an energy storage apparatus. The energy storage apparatus includes a housing, an energy storage unit group, and a temperature and humidity sensor, where the energy storage unit group and the temperature and humidity sensor are arranged inside the housing. The monitoring method includes: measuring a real-time temperature and a real-time humidity inside a housing by means of a temperature and humidity sensor; determining a dew point temperature matching the real-time humidity, and comparing the real-time temperature with the dew point temperature, so as to obtain a comparison result; and executing a processing policy matching the comparison result. By means of the method, the present application can monitor the environment inside an energy storage apparatus in real time, and can perform corresponding processing on the environment inside the energy storage apparatus, thereby more effectively maintaining the operation and usage of the energy storage apparatus during the process of using the energy storage apparatus.

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The present application discloses a negative electrode current collector, a battery cell, a battery, and an electric apparatus. The negative electrode current collector includes a substrate and an alloy layer located on at least one side of the substrate, where the alloy layer includes a first metal element and a second metal element, the substrate includes a third metal element, the nucleation overpotential of the elemental form of the second metal element is less than the nucleation overpotential of the elemental form of the first metal element, the nucleation overpotential for lithium metal on the elemental form of the first metal element is greater than or equal to 0.10 V, and the nucleation overpotential of the elemental form of the second metal element is less than the nucleation overpotential of the elemental form of the third metal element. The present application enables the battery to have high coulombic efficiency, high reliability, and long cycle life.

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An electrolyte injection system and electrolyte injection method for a battery. The electrolyte injection system comprises a mounting base (1), an electrolyte injection module (2), and a weighing module (3). The electrolyte injection module (2) comprises a tray (21) and electrolyte injection tanks (22). The weighing module (3) is arranged on the mounting base (1). The electrolyte injection tanks (22) have a pre-assembled state and an assembled state. When in the pre-assembled state, the electrolyte injection tanks (22) are pre-assembled on the tray (21), the weight of the electrolyte injection tanks (22) being borne by the tray (21). When in the assembled state, the electrolyte injection tanks (22) are assembled on the weighing module (3), the weight of the electrolyte injection tanks (22) being borne by the weighing module (3). The weighing module (3) is used for weighing the electrolyte injection tanks (22). The electrolyte injection system is provided with the weighing module (3) for weighing the electrolyte injection tanks (22) in real time so as to acquire the quantity of an electrolyte injected into the electrolyte injection tanks (22), does not need an electrolyte injection pump for controlling the quantity of the injected electrolyte, and likewise does not require a bubble removing action, thus improving electrolyte preparation efficiency.

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The present application provides a battery airtightness testing system and method. The battery airtightness testing system comprises an initial test module and at least two re-test modules. The initial test module is configured to perform a first airtightness test on a plurality of incoming battery packs; each incoming battery pack comprises a plurality of batteries; and the battery packs tested by the initial test module include a first compliant battery pack and a first non-compliant battery pack. The re-test module comprises a buffer platform, a re-test chamber, and a re-test manipulator; the buffer platform is configured to receive and store the first non-compliant battery pack; the re-test manipulator is configured to grab all batteries in the first non-compliant battery pack buffered in the buffer platform into the re-test chamber; the re-test chamber is configured to perform an independent second airtightness test on each battery in the first non-compliant battery pack; and the batteries tested by the re-test chamber include a second compliant battery and a second non-compliant battery.

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Provided in the present application are a battery welding apparatus and a battery welding method. The battery welding apparatus includes a conveyor line, a cell feeding device, a connecting piece feeding device, and a welding device. The conveyor line includes a plurality of carriers arranged in a conveying direction of the conveyor line. The cell feeding device includes at least two cell feeding mechanisms; the at least two cell feeding mechanisms are respectively configured to feed at least two battery cell sets into at least two target carriers of the conveyor line, and each of the battery cell sets includes at least two cells. The connecting piece feeding device is configured to feed connecting pieces into the at least two target carriers. The welding device is arranged on a lateral side of the conveyor line. The conveyor line is movably arranged to sequentially convey the at least two target carriers to the welding device for welding. The welding device is configured to weld the connecting pieces and the at least two cells in the target carrier. The battery welding apparatus of the present application improves the welding efficiency.

The present application provides a feeding method, a feeding system and a battery production line. The method comprises: controlling a first transport vehicle and a second transport vehicle to transport first raw materials and second raw materials to a first docking position and a second docking position, respectively; controlling a third transport vehicle to reach a third docking position; controlling a driving assembly to transfer first material carrying trays carrying the first raw materials on the first transport vehicle to a pick-up position; controlling a manipulator to transfer the first raw materials at the pick-up position to a placement position until the first material carrying trays become first empty trays; controlling the driving assembly to transfer the first empty trays onto the third transport vehicle; then, controlling the driving assembly to transfer the second raw materials to the pick-up position; controlling the manipulator to transfer the second raw materials at the pick-up position to the placement position until second material carrying trays become second empty trays; and controlling the driving assembly to transfer the second empty trays onto the first transport vehicle. In this way, the driving assembly can be controlled to reach any docking position, and each transport vehicle can carry raw materials and can also carry empty trays.

This application provides a winding device and a winding method, pertaining to the field of battery technologies. The winding device includes a feeding mechanism and a winding needle, the feeding mechanism being configured to convey an electrode plate and a separator; and the winding needle being configured to wind the electrode plate and the separator conveyed by the feeding mechanism to form an electrode assembly, where a relationship between a diameter r of the winding needle and a diameter R of the electrode assembly after winding is completed satisfies R r > 10 <img class="EMIRef" id="9a12b526-c84e-471c-aea7-56f2e4c447ab-ia01" /> .

A battery cell (20), a battery (100), and an electric device, relating to the technical field of batteries. The battery cell (20) comprises a casing (21), an electrode assembly (22), and an electrode terminal (23). The casing (21) has a wall portion (211), and a mounting hole (2111) is formed in the wall portion (211). The electrode assembly (22) is accommodated in the casing (21). The electrode terminal (23) comprises a pole (231) and a connecting member (232). The pole (231) passes through the mounting hole (2111). The pole (231) is electrically connected to the electrode assembly (22). In the thickness direction of the wall portion (211), the connecting member (232) is located on the side of the wall portion (211) facing away from the electrode assembly (22), and the connecting member (232) is connected to the pole (231). The connecting member (232) comprises a first material layer (2321) and a second material layer (2322) which are stacked in the thickness direction of the wall portion (211). The first material layer (2321) is located on the side of the second material layer (2322) facing away from the electrode assembly (22). The first material layer (2321) is electrically connected to the pole (231) and is connected to a flow convergence component. The melting point of the second material layer (2322) is greater than that of the first material layer (2321). According to the battery cell (20) of such structure, the thickness of the first material layer (2321) can be optimized while weld penetration of the connecting member (232) is reduced, so as to reduce the space occupied by the connecting member (232) in the thickness direction of the wall portion (211).

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Disclosed are a battery cell (20), a battery, and an electrical device. The battery cell (20) comprises: a housing assembly (21), comprising a housing (211), a terminal (212), and a cover plate (213), wherein the housing (211) has a first wall (2111), a hole (211a) is provided in the first wall (2111), the terminal (212) comprises a connecting portion (2122) and a body portion (2121) which are connected to each other, the body portion (2121) is located inside of the first wall (2111), the connecting portion (2122) passes through the hole (211a), the connecting portion (2122) has a flanged portion (201) and a first accommodating recess (202), the flanged portion (201) is located outside the first wall (2111) and is away from the hole (211a), the first accommodating recess (202) is close to the side of the center of the hole (211a), the first accommodating recess (202) comprises at least two stepped recesses, and the cover plate (213) is arranged on one of the at least two stepped recesses close to the body portion (2121); and an electrode assembly (22), wherein the electrode assembly (22) is arranged in the housing (211) and is electrically connected to the body portion (2121) or the connecting portion (2122).

A battery cell (100), a battery (1000), and an electric device (2000). The battery cell (100) comprises: a casing (10); an electrode assembly (20), which is arranged in the casing (10), wherein the electrode assembly (20) comprises an electrode sheet (21) and a separator (22), the electrode sheet (21) and the separator (22) being stacked and then wound to form the electrode assembly (20), and in the direction of winding of the electrode assembly (20), the electrode assembly (20) is provided with a winding tail end (20a); and a buffer member (30), which is arranged in the casing (10), wherein in the direction of stacking of the electrode sheet (21) and the separator (22), the buffer member (30) covers at least part of the winding tail end (20a).

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