Electrical connection plate, terminal post extension member, battery cell member and battery assembly

Abstract

The present invention belongs to the field of batteries, and specifically relates to an electrical connection plate, a terminal post extension member, a battery cell member and a battery assembly, which overcome the problems of poor connection stability, low electrical conductivity, etc., in existing electrical connections. The electrical connection plate comprises an electrical connection portion, wherein the electrical connection portion is provided with first welding portions, the first welding portions are configured to be arranged opposite second welding portions on polarity terminals of a battery to form a seam, and the first welding portions are welded to the second welding portions at the seam. The battery assembly comprises a battery and two electrical connection plates, wherein first welding portions of one electrical connection plate are arranged opposite second welding portions on n positive polarity terminals in the battery to form a seam, and the first welding portions are welded to the second welding portions at the seam; and first welding portions of the other electrical connection plate are arranged opposite second welding portions on n negative polarity terminals to form a seam, and the first welding portions are welded to the second welding portions at the seam. On the basis of butt seam welding, a connection gap is fundamentally eliminated, thereby reducing the contact resistance, and significantly improving the electrical conduction efficiency.

Description

An electrical connection plate, a terminal extension, a single cell component, and a battery assembly. Technical Field

[0001] This invention belongs to the field of batteries, specifically an electrical connection plate, a terminal extension, a single cell component, and a battery assembly. Background Technology

[0002] In the construction of battery modules, achieving stable and efficient electrical connections between batteries is crucial. Traditional connection methods, such as screw connections and lap welding, are gradually revealing their limitations when facing complex operating conditions and demanding application scenarios.

[0003] Although screw connections are relatively simple to operate, screws are prone to loosening under complex working conditions such as vibration and impact, which increases the contact resistance of the connection. This not only affects the conductivity of the battery module, but may also cause safety hazards due to local overheating.

[0004] While lap welding can achieve electrical connections to a certain extent, it suffers from uneven welding area and inconsistent weld strength. Due to the uneven current distribution in the lap section, localized excessive current density can easily occur, leading to overheating or even melting of the weld joint. Furthermore, the weld seam formed by lap welding is relatively rough, increasing resistance loss and affecting conductivity. Summary of the Invention

[0005] The first aspect of the present invention provides an electrical connection board that overcomes the problems of poor connection stability and low conductivity of existing electrical connections.

[0006] The electrical connection plate includes an electrical connection portion, on which a first welding portion is provided. The first welding portion is configured to form a joint with a second welding portion on the battery polarity terminal, and the joint is welded together.

[0007] This invention employs a butt weld method to connect the first and second welded parts, forming a continuous weld at the connection point. This connection method fundamentally eliminates the gap between the two parts, reduces contact resistance, and significantly improves conductivity. Simultaneously, the continuous weld structure effectively disperses stress, avoids stress concentration, and enhances connection reliability. Furthermore, the weld surface formed by butt welds is relatively smooth, reducing resistance loss and improving the conductivity of the electrical connection compared to traditional lap welds.

[0008] Furthermore, the aforementioned electrical connection portion includes a plate body; the aforementioned first welding portion comprises two parts; the two first welding portions are respectively disposed on both sides of the plate body in the width direction and extend along the length direction of the plate body.

[0009] Based on the two first welding parts on both sides of the main body of the board, on the one hand, the connection strength between the electrical connection board and the polarity terminal can be enhanced, improving the connection reliability; on the other hand, the two first welding parts are symmetrically arranged, which can widen the current path compared with the single-sided welding method, allowing the current to be distributed more evenly and avoiding heat loss caused by local current concentration. In contrast, with single-sided welding, the current is often concentrated on one side, which can easily cause excessive local current density and heat loss.

[0010] Furthermore, the aforementioned first welded portion is the edge of the top surface of the plate body in the width direction.

[0011] The first welding part is set directly as the edge of the top surface of the plate body in the width direction, which makes the most of the plate body's own structure, reduces additional processing steps, and lowers production costs.

[0012] Furthermore, a first inclined surface is provided at the edge where the aforementioned edge intersects with the outer wall of the plate body; the first inclined surface is used to cooperate with the second inclined surface on the second welding part of the polarity terminal, and the two form a welding area with a V-shaped cross-section.

[0013] A first bevel is provided at the edge where the edge intersects with the outer wall of the main body of the plate. This bevel, together with the second bevel of the second welding part of the polarity terminal, forms a V-shaped welding area. Compared with planar welding, this effectively increases the welding area. During the welding process, the solder can fully fill the V-shaped groove, enhancing the welding strength. At the same time, the V-shaped structure makes the solder distribution in the welding area more uniform, reducing problems such as incomplete welding and missed welding, and improving welding stability and durability.

[0014] Furthermore, the present invention may also provide folded edges on the main body of the plate as first welding portions. Specifically, the aforementioned electrical connection portion further includes two folded edges; the two folded edges are respectively provided on both sides in the width direction of the main body of the plate, both extending along the length direction of the main body of the plate, and folded away from the main body of the plate; the top surfaces of the two folded edges respectively serve as two aforementioned first welding portions.

[0015] The folded edge is turned away from the main body of the plate, which enhances the overall rigidity of the electrical connection plate without increasing the thickness of the main body of the plate, making it more resistant to deformation under complex working conditions.

[0016] Furthermore, the edge where the top surface of the aforementioned folded edge intersects the outer wall of the folded edge is provided with a third inclined surface;

[0017] The aforementioned third bevel is used to mate with the second bevel on the second welding part of the polarity terminal, and the two together form a welding area with a V-shaped cross-section.

[0018] A third bevel is provided at the edge where the top surface of the folded edge intersects with the outer wall of the folded edge. This bevel, together with the second bevel of the second welding part of the polarity terminal, forms a V-shaped welding area. Compared with planar welding, this effectively increases the welding area. During the welding process, the solder can fully fill the V-shaped groove, enhancing the welding strength. At the same time, the V-shaped structure makes the solder distribution in the welding area more uniform, reducing problems such as incomplete soldering and missed soldering, and improving welding stability and durability.

[0019] Furthermore, the aforementioned electrical connection plate also includes a clamping part; the clamping part is used to press against the outer surface of the heat exchanger fixed on the battery polarity terminal.

[0020] The clamping part maintains close contact with the heat exchanger through stable downward pressure, significantly reducing the contact thermal resistance between the heat exchanger and the polarity terminal. During operation, it can quickly conduct heat from the polarity terminal, preventing localized overheating, ensuring stable battery operating temperature, and extending service life. In addition, the clamping part limits the movement of the heat exchanger, preventing displacement under vibration, ensuring a stable heat conduction path, and improving the reliability and safety of the battery module.

[0021] Furthermore, the aforementioned pressing part is a second through groove opened on the plate body along the length direction of the plate body. The inner surface of the aforementioned second through groove is used to press against the outer surface of the heat exchange component fixed on the battery polarity terminal. The aforementioned second through groove is located between the two first welding parts.

[0022] The design of using the second channel as a clamping part cleverly utilizes the spatial structure of the plate body, achieving effective clamping and limiting of the heat exchange components without adding too many parts.

[0023] A second aspect of the present invention provides a first battery assembly, comprising a battery and two electrical connection plates as described in the first aspect;

[0024] The battery described above includes a casing and m electrode assemblies, where m is an integer greater than 1;

[0025] The aforementioned m electrode assemblies are arranged in the housing along the first direction. The top plate of the housing is provided with 2n polarity terminals corresponding to the electrode tabs of the electrode assemblies. The tabs of each electrode assembly are connected to the corresponding polarity terminals. Each polarity terminal is provided with a second welding part.

[0026] Two electrical connection plates are parallel to each other and both extend along a first direction; the first welding part of one electrical connection plate is arranged opposite to the second welding part on n positive terminals to form a joint, and the two plates are welded together at the joint; the first welding part of the other electrical connection plate is arranged opposite to the second welding part on n negative terminals to form a joint, and the two plates are welded together at the joint; thus realizing the parallel connection between m electrode assemblies.

[0027] Furthermore, the battery also includes heat exchange components fixed on each polarity terminal; the clamping part on the electrical connection plate is pressed into contact with the outer surface of the heat exchange component.

[0028] A third aspect of the present invention provides a second battery assembly, comprising a high-capacity battery and two electrical connection plates as described in the first aspect;

[0029] The aforementioned high-capacity battery includes n individual cells arranged along a first direction; the internal cavities of the n individual cells are interconnected, and the electrolyte and / or gas between the individual cells are shared; where n is an integer greater than 1; each individual cell has a second welding part on its polarity terminal;

[0030] The aforementioned electrical connection plate includes an electrical connection portion, and the electrical connection portion is provided with a first welding portion;

[0031] Two electrical connection plates are parallel to each other and both extend along a first direction; the first welding part of one electrical connection plate is arranged opposite to the second welding parts on all positive terminals of the n individual cells to form a joint, and the joint is welded together; the first welding part of the other electrical connection plate is arranged opposite to the second welding parts on all negative terminals of the n individual cells to form a joint, and the joint is welded together; thus realizing the parallel connection between the n individual cells.

[0032] This invention employs a butt weld method to connect the first and second welded parts, forming a continuous weld at the connection point. This connection method fundamentally eliminates the gap between the two parts, reduces contact resistance, and significantly improves conductivity. Simultaneously, the continuous weld structure effectively disperses stress, avoids stress concentration, and enhances connection reliability. Furthermore, the weld surface formed by butt welds is relatively smooth, reducing resistance loss and improving the conductivity of the electrical connection compared to traditional lap welds.

[0033] In addition, the electrolyte and / or gas inside each individual cell are interconnected, so that the electrolyte and / or gas of all individual cells are in the same system, reducing the differences between individual cells and improving the consistency between individual cells to a certain extent, thereby improving the cycle life of large-capacity battery modules to a certain extent.

[0034] Furthermore, each individual cell in the battery assembly has a first through groove extending in a first direction on its polar terminal; the top end faces of the two side walls of the first through groove serve as two second welding parts.

[0035] The electrical connection portion includes a plate body; there are two first welding portions; the two first welding portions are respectively disposed on both sides of the plate body in the width direction and extend along the length direction of the plate body;

[0036] One of the electrical connection plates is embedded in the first through slot on all the positive terminals on one side of the n individual cells. The two first welding parts are respectively arranged opposite to the second welding parts on the same side of the polarity terminals of the n individual cells to form a joint, and are welded together at the joint.

[0037] Another electrical connection plate is embedded in the first through slot on all the negative terminals on one side of the n individual cells. The two first welding parts are respectively arranged opposite to the second welding parts on the same side of the polarity terminals of the n individual cells to form a joint, and are welded together at the joint.

[0038] Based on the two first welding parts on both sides of the main body of the board, on the one hand, the connection strength between the electrical connection board and the polarity terminal can be enhanced, improving the connection reliability; on the other hand, the two first welding parts are symmetrically arranged, which can widen the current path compared with the single-sided welding method, allowing the current to be distributed more evenly and avoiding heat loss caused by local current concentration. In contrast, with single-sided welding, the current is often concentrated on one side, which can easily cause excessive local current density and heat loss.

[0039] In addition, the first through slot also plays a precise limiting role for the electrical connection plate, helping to improve assembly accuracy and connection reliability.

[0040] Furthermore, the first welded portion is located at the edge of the top surface of the main body of the plate in the width direction. By directly setting the first welded portion as the edge of the top surface of the main body of the plate in the width direction, the plate's own structure is utilized to the maximum extent, reducing additional processing steps and lowering production costs.

[0041] Furthermore, a first inclined surface is provided at the edge where the aforementioned edge intersects with the outer wall of the main body of the plate; a second inclined surface is provided at the edge where the aforementioned second welding part of the polar terminal intersects with the large surface of the side wall of the first through groove;

[0042] The first inclined surface and the second inclined surface are fitted together; the two together form a welding area with a V-shaped cross-section.

[0043] A first bevel is provided at the edge where the edge intersects with the outer wall of the main body of the plate. This bevel, together with the second bevel of the second welding part of the polarity terminal, forms a V-shaped welding area. Compared with planar welding, this effectively increases the welding area. During the welding process, the solder can fully fill the V-shaped groove, enhancing the welding strength. At the same time, the V-shaped structure makes the solder distribution in the welding area more uniform, reducing problems such as incomplete welding and missed welding, and improving welding stability and durability.

[0044] Furthermore, the aforementioned electrical connection portion also includes two folded edges; the two folded edges are respectively disposed on both sides of the width direction of the main body of the plate, both extending along the length direction of the main body of the plate, and folded away from the main body of the plate; the top surfaces of the two folded edges respectively serve as the two aforementioned first welding portions.

[0045] The folded edge is turned away from the main body of the plate, which enhances the overall rigidity of the electrical connection plate without increasing the thickness of the main body of the plate, making it more resistant to deformation under complex working conditions.

[0046] Furthermore, the edge where the top surface of the aforementioned folded edge intersects with the outer side wall of the folded edge is provided with a third inclined surface; the edge where the top end face of the side wall of the first through groove on the aforementioned polar terminal intersects with the large surface of the side wall of the first through groove is provided with a second inclined surface.

[0047] The third inclined surface and the second inclined surface are combined to form a welding area with a V-shaped cross-section.

[0048] A third bevel is provided at the edge where the top surface of the folded edge intersects with the outer wall of the folded edge. This bevel, together with the second bevel of the second welding part of the polarity terminal, forms a V-shaped welding area. Compared with planar welding, this effectively increases the welding area. During the welding process, the solder can fully fill the V-shaped groove, enhancing the welding strength. At the same time, the V-shaped structure makes the solder distribution in the welding area more uniform, reducing problems such as incomplete soldering and missed soldering, and improving welding stability and durability.

[0049] Furthermore, the aforementioned high-capacity battery also includes heat exchange components embedded in the first through slots on each polarity terminal; the aforementioned electrical connection plate also includes a clamping part; the clamping part is in tight contact with the outer surface of the heat exchange component. The clamping part, through stable downward pressure, maintains close contact with the heat exchange component, significantly reducing the contact thermal resistance between the heat exchange component and the polarity terminal. During operation, it can quickly conduct heat from the polarity terminal, avoiding localized overheating, ensuring stable battery operating temperature, and extending service life. In addition, the clamping part limits the movement of the heat exchange component, preventing displacement under vibration, ensuring a stable heat conduction path, and improving the reliability and safety of the high-capacity battery assembly.

[0050] Furthermore, the aforementioned clamping part is a second through groove opened on the plate body along the length direction of the plate body, and the second through groove is located between the two first welding parts;

[0051] The inner surface of the second channel is pressed into contact with the outer surface of the heat exchanger.

[0052] The design of using the second channel as a clamping part cleverly utilizes the spatial structure of the plate body, achieving effective clamping and limiting of the heat exchange components without adding too many parts.

[0053] Furthermore, the aforementioned high-capacity battery also includes a casing; multiple individual cells are arranged inside the casing; the top plate of the casing has clearance holes corresponding to the polarity terminals of each individual cell; the polarity terminals of each individual cell extend out of the corresponding clearance holes, and the area corresponding to each clearance hole on the top plate of the casing is sealed and connected to the top cover plate of the corresponding individual cell.

[0054] The fourth aspect of the present invention provides a third type of battery assembly, including a battery module and a plurality of electrical connection plates as described in the first aspect;

[0055] The aforementioned battery module includes n individual cells arranged along a first direction; where n is an integer greater than 1; each individual cell has a second welding part on its polarity terminal;

[0056] The aforementioned electrical connection plate includes an electrical connection portion, and the electrical connection portion is provided with a first welding portion;

[0057] The first welded part at both ends of each electrical connection plate is respectively arranged opposite to the second welded part of the different polarity terminal of the adjacent single cell to form a joint. The joint is welded and connected to realize the series connection between n single cells.

[0058] This invention employs a butt weld method to connect the first and second welded parts, forming a continuous weld at the connection point. This connection method fundamentally eliminates the gap between the two parts, reduces contact resistance, and significantly improves conductivity. Simultaneously, the continuous weld structure effectively disperses stress, avoids stress concentration, and enhances connection reliability. Furthermore, the weld surface formed by butt welds is relatively smooth, reducing resistance loss and improving the conductivity of the electrical connection compared to traditional lap welds.

[0059] Furthermore, each individual cell of the battery assembly has a first through groove extending in a first direction on its polar terminal, and the top end faces of the two side walls of the first through groove serve as two second welding parts.

[0060] The aforementioned electrical connection portion includes a plate body; the aforementioned first welding portion consists of two parts; the two first welding portions are respectively disposed on both sides of the plate body in the width direction and extend along the plate body in the length direction;

[0061] Each plate body has a first through groove embedded at both ends of the adjacent single cell terminals of different polarities. Each first welding part and the corresponding second welding part are arranged opposite to each other to form a joint, and are welded together at the joint.

[0062] Based on the two first welding parts on both sides of the main body of the board, on the one hand, the connection strength between the electrical connection board and the polarity terminal can be enhanced, improving the connection reliability; on the other hand, the two first welding parts are symmetrically arranged, which can widen the current path compared with the single-sided welding method, allowing the current to be distributed more evenly and avoiding heat loss caused by local current concentration. In contrast, with single-sided welding, the current is often concentrated on one side, which can easily cause excessive local current density and heat loss.

[0063] In addition, the first through slot also plays a precise limiting role for the electrical connection plate, helping to improve assembly accuracy and connection reliability.

[0064] Furthermore, the aforementioned first welded portion is the edge of the top surface of the plate body in the width direction.

[0065] The first welding part is set directly as the edge of the top surface of the plate body in the width direction, which makes the most of the plate body's own structure, reduces additional processing steps, and lowers production costs.

[0066] Furthermore, a first inclined surface is provided at the edge where the aforementioned edge intersects with the outer wall of the main body of the plate;

[0067] The edge where the top end face of the first through slot sidewall of the above-mentioned polar terminal intersects with the large surface of the first through slot sidewall is provided with a second inclined surface;

[0068] The first and second inclined surfaces are combined to form a welding area with a V-shaped cross-section.

[0069] A first bevel is provided at the edge where the edge intersects with the outer wall of the main body of the plate. This bevel, together with the second bevel of the second welding part of the polarity terminal, forms a V-shaped welding area. Compared with planar welding, this effectively increases the welding area. During the welding process, the solder can fully fill the V-shaped groove, enhancing the welding strength. At the same time, the V-shaped structure makes the solder distribution in the welding area more uniform, reducing problems such as incomplete welding and missed welding, and improving welding stability and durability.

[0070] Furthermore, the aforementioned electrical connection portion also includes two folded edges; the two folded edges are respectively disposed on both sides of the width direction of the main body of the plate, both extending along the length direction of the main body of the plate, and folded away from the main body of the plate; the top surfaces of the two folded edges respectively serve as the two aforementioned first welding portions.

[0071] The folded edge is turned away from the main body of the plate, which enhances the overall rigidity of the electrical connection plate without increasing the thickness of the main body of the plate, making it more resistant to deformation under complex working conditions.

[0072] Furthermore, the edge where the top surface of the aforementioned folded edge intersects the outer wall of the folded edge is provided with a third inclined surface;

[0073] The top end face of the first through groove sidewall of the above-mentioned polar terminal intersects with the large surface of the first through groove sidewall at the edge provided with a second inclined surface; the third inclined surface cooperates with the second inclined surface, and the two form a welding area with a V-shaped cross-section.

[0074] A third bevel is provided at the edge where the top surface of the folded edge intersects with the outer wall of the folded edge. This bevel, together with the second bevel of the second welding part of the polarity terminal, forms a V-shaped welding area. Compared with planar welding, this effectively increases the welding area. During the welding process, the solder can fully fill the V-shaped groove, enhancing the welding strength. At the same time, the V-shaped structure makes the solder distribution in the welding area more uniform, reducing problems such as incomplete soldering and missed soldering, and improving welding stability and durability.

[0075] Furthermore, the battery module also includes a heat exchanger embedded in the first through slot on each polarity terminal; the electrical connection plate also includes a clamping part; the clamping part is in press-fit contact with the outer surface of the heat exchanger.

[0076] The clamping part maintains close contact with the heat exchanger through stable downward pressure, significantly reducing the contact thermal resistance between the heat exchanger and the polarity terminal. During operation, it can quickly conduct heat from the polarity terminal, preventing localized overheating, ensuring stable battery operating temperature, and extending service life. In addition, the clamping part limits the movement of the heat exchanger, preventing displacement under vibration, ensuring a stable heat conduction path, and improving the reliability and safety of the battery module.

[0077] Furthermore, the aforementioned clamping part is a second through groove opened on the plate body along the length direction of the plate body, and the second through groove is located between the two first welding parts;

[0078] The inner surface of the second channel is pressed into contact with the outer surface of the heat exchanger.

[0079] The design of using the second channel as a clamping part cleverly utilizes the spatial structure of the plate body, achieving effective clamping and limiting of the heat exchange components without adding too many parts.

[0080] Furthermore, the battery module also includes a housing; the housing is provided with an explosion vent; n individual batteries are arranged in the housing along a first direction; the top plate of the housing is provided with clearance holes corresponding to the polarity terminals of each individual battery; the polarity terminals of each individual battery extend out of the corresponding clearance holes, and the area corresponding to each clearance hole on the top plate of the housing is sealed and connected to the top cover plate of the corresponding individual battery.

[0081] The aforementioned casing is equipped with a venting channel that communicates with the venting port. Thermal runaway fumes are discharged in an orderly manner from the venting port through the venting channel for treatment, thereby improving the safety performance of this type of battery component.

[0082] Furthermore, the aforementioned battery module also includes an explosion venting channel; this channel extends along a first direction and seals over the explosion vents of the n individual cells. Thermal runaway fumes are discharged in an orderly manner through the explosion venting channel, improving the safety performance of this type of battery assembly.

[0083] The fifth aspect of the present invention provides a terminal extension member, including a terminal extension member body; a first through groove for installing a heat exchanger is formed on the terminal extension member body, and the bottom of the first through groove is used for fixed connection with the terminal of a single battery cell.

[0084] This invention aims to achieve better heat dissipation by directly cooling the battery terminal. Specifically, this can be achieved by fixing a heat exchanger onto the terminal. However, existing battery terminals are relatively short, making it difficult to install a structure for fixing the heat exchanger. Therefore, this invention provides a terminal extension, which is fixed to the terminal to increase its height and serves as the polarity terminal of the battery. The invention features a first through-slot on the terminal extension for mounting the heat exchanger, and the extension is fixed to the individual battery terminal via the bottom of the first through-slot.

[0085] The heat generated at the battery terminals is first conducted to the terminal extension, which is in close contact with them. Because the terminal extension fits tightly to the terminals, heat can be transferred relatively efficiently from the terminals to the extension. The first through-slot in the terminal extension is used to fix the heat exchanger, ensuring good thermal contact between the heat exchanger and the terminal extension. After heat is conducted to the terminal extension, it is further transferred to the heat exchanger. The heat rapidly diffuses within the heat exchanger and is dissipated through heat exchange with the surrounding environment, thus achieving heat dissipation for the battery.

[0086] Meanwhile, the through-slot design ensures that the heat exchanger is stably fixed on the pole extension, avoiding poor thermal contact between the heat exchanger and the pole extension due to vibration or other factors, thus ensuring the stability and reliability of the heat dissipation effect.

[0087] Furthermore, the inner surface of the first through groove is curved, which allows for a tight fit with the heat exchanger tube wall. The bottom of the first through groove has a blind hole with a flat bottom, used for welding to the individual battery terminal. The curved structure is easier to adapt to a round tube, allowing for a tight fit when the round tube is inserted into the first through groove. This tight fit effectively increases the contact area between the heat exchanger and the terminal extension, thereby improving thermal conductivity. However, the curved structure is more difficult to fix to the battery terminal than a flat structure. To solve this problem while fully utilizing the compatibility between the curved groove bottom and the round tube, this invention provides a blind hole at the bottom of the groove. The bottom of the blind hole is flat, allowing for welding to the terminal. This satisfies the connection requirements between the terminal and the adapter while utilizing the compatibility of the curved surface with the round tube.

[0088] Furthermore, the aforementioned pole extension also includes a heat-conducting column; the heat-conducting column is fixed within the blind hole and fits tightly against the inner wall of the blind hole, with its surface away from the bottom of the blind hole being arc-shaped for tight fit against the heat exchanger tube wall. When the blind hole is opened and the heat exchanger is inserted into the first through slot, a large gap will exist between the heat exchanger and the blind hole. This gap affects thermal and electrical conductivity. To address this, the present invention fixes a heat-conducting column within the blind hole to fill the gap, improving the thermal conductivity between the heat exchanger and the pole extension, while simultaneously optimizing the electrical conductivity of the pole extension.

[0089] Furthermore, the aforementioned pole extension also includes an adhesive layer; the adhesive layer is used to be disposed between the heat exchanger and the heat-conducting pillar and the first through groove. The adhesive layer can fix the heat exchanger and prevent it from shaking within the first through groove. In addition, the adhesive layer can achieve more uniform heat conduction at the microscopic level. Compared with traditional solid contact methods, the adhesive layer can better adapt to different surface shapes and roughnesses, ensuring that heat can be transferred more evenly.

[0090] Furthermore, the aforementioned pole extension also includes an electrical connection plate; the electrical connection plate is used to press the heat exchanger onto the pole extension body; in conjunction with the adhesive layer, it further improves the stability of the heat exchanger, while making the tube wall of the heat exchanger adhere more tightly to the adhesive layer, thus optimizing the heat transfer performance.

[0091] Furthermore, in the depth direction of the first through slot, the size of the first through slot is larger than the size of the heat exchanger; in the width direction of the through slot, the opening size of the first through slot is larger than the size of the rest of the first through slot; ensuring that the heat exchanger can be easily placed into the first through slot, reducing the difficulty of installation;

[0092] An electrical connection plate is fixed within the first through slot and located at the opening. A second through slot is formed on the electrical connection plate. The inner surface shape of the second through slot is adapted to the shape of the heat exchanger tube wall for a tight fit. This tight fit between the inner surface of the second through slot and the heat exchanger tube wall minimizes the gap between them, thereby increasing the contact area and enhancing thermal conductivity. The tight contact also effectively reduces contact resistance and thermal resistance, allowing for more efficient heat transfer.

[0093] Furthermore, a third step structure is provided on the side wall of the first through groove. The step surface is used to cooperate with the electrical connection plate and limit the electrical connection plate in the depth direction of the first through groove. Limiting the electrical connection plate in the depth direction of the first through groove can effectively prevent unnecessary displacement of the electrical connection plate during use.

[0094] Furthermore, the upper surface of the electrical connection plate and the upper surface of the pole extension body are located on the same plane, serving as the electrical connection surface;

[0095] The orthographic projection area of ​​the electrical connection surface on the horizontal plane is larger than the orthographic projection area of ​​the rest of the pole extension body on the horizontal plane, ensuring that this type of polarity terminal has a larger electrical connection area, which facilitates connection with external electrical connectors.

[0096] The sixth aspect of the present invention provides a single-cell battery component, comprising a single-cell battery, characterized in that it further comprises a terminal extension member as described in the fifth aspect, which is fixed to the terminal post of the single-cell battery.

[0097] The seventh aspect of the present invention provides a battery assembly, characterized in that: it includes a heat exchanger and n individual battery components arranged in the same direction as described in the sixth aspect, where n is an integer greater than 1; the heat exchanger is installed in a first through slot of each individual battery component.

[0098] The beneficial effects of this invention are:

[0099] This invention employs a butt weld method to connect the first and second welded parts, forming a continuous weld at the connection point. This connection method fundamentally eliminates the gap between the two parts, reduces contact resistance, and significantly improves conductivity. Simultaneously, the continuous weld structure effectively disperses stress, avoids stress concentration, and enhances connection reliability. Furthermore, the weld surface formed by butt welds is relatively smooth, reducing resistance loss and improving the conductivity of the electrical connection compared to traditional lap welds.

[0100] In the battery assembly of this invention, a first welding portion is provided on the electrical connection plate, and a second welding portion is provided on the polarity terminal. The first welding portion and the second welding portion are connected by a butt weld, forming a continuous weld at the connection point. This connection method fundamentally eliminates the connection gap between the two, reduces contact resistance, and significantly improves conductivity. Simultaneously, the continuous weld structure effectively disperses stress, avoids stress concentration, and enhances connection reliability. Furthermore, the weld surface formed by butt weld is relatively smooth, reducing resistance loss and improving the conductivity of the electrical connection compared to traditional lap welds.

[0101] In addition, the electrolyte and / or gas inside each individual cell are interconnected, so that the electrolyte and / or gas of all individual cells are in the same system, reducing the differences between individual cells and improving the consistency between individual cells to a certain extent, thereby improving the cycle life of the battery module to a certain extent.

[0102] This invention provides a terminal extension member, which is fixed to the terminal to increase the height of the terminal and serves as the polarity terminal of the battery. A first through groove is formed on the terminal extension member for mounting a heat exchange component, and the extension member is fixed to the individual battery terminal through the bottom of the first through groove.

[0103] The heat generated at the battery terminals is first conducted to the terminal extension, which is in close contact with them. Because the terminal extension fits tightly to the terminals, heat can be transferred relatively efficiently from the terminals to the extension. The first through-slot in the terminal extension is used to fix the heat exchanger, ensuring good thermal contact between the heat exchanger and the terminal extension. After heat is conducted to the terminal extension, it is further transferred to the heat exchanger. The heat rapidly diffuses within the heat exchanger and is dissipated through heat exchange with the surrounding environment, thus achieving heat dissipation for the battery.

[0104] Meanwhile, the through-slot design ensures that the heat exchanger is stably fixed on the pole extension, avoiding poor thermal contact between the heat exchanger and the pole extension due to vibration or other factors, thus ensuring the stability and reliability of the heat dissipation effect. Attached Figure Description

[0105] Figure 1 is a schematic diagram of the electrical connection plate in Embodiment 1;

[0106] Figure 2 is a schematic diagram of the battery assembly in Example 1;

[0107] Figure 3 is a cross-sectional view of the battery assembly in Example 1;

[0108] Figure 4 is a partial cross-sectional view of the battery assembly in another embodiment;

[0109] Figure 5 is a partial cross-sectional view of the battery assembly in Example 1;

[0110] Figure 6 is a schematic diagram of the electrical connection plate in Embodiment 2;

[0111] Figure 7 is a schematic diagram of the battery assembly in Example 2;

[0112] Figure 8 is a cross-sectional view of the battery assembly in Example 2;

[0113] Figure 9 is a partial cross-sectional view of the battery assembly in another embodiment;

[0114] Figure 10 is a partial cross-sectional view of the battery assembly in Embodiment 2;

[0115] Figure 11 is a schematic diagram of an electrical connection plate in Embodiment 3;

[0116] Figure 12 is a schematic diagram of a battery assembly in Example 3;

[0117] Figure 13 is a partial cross-sectional view of a battery assembly in Embodiment 3;

[0118] Figure 14 is a schematic diagram of another electrical connection plate in Embodiment 3;

[0119] Figure 15 is a cross-sectional view of another electrical connection plate in Embodiment 3;

[0120] Figure 16 is a schematic diagram of another battery assembly in Example 3;

[0121] Figure 17 is a partial cross-sectional view of another battery assembly in Embodiment 3;

[0122] Figure 18 is a schematic diagram of the battery assembly in Example 4.

[0123] Figure 19 is a schematic diagram of the structure of the large-capacity battery module in Example 7;

[0124] Figure 20 is a partial cross-sectional view of the high-capacity battery assembly in Example 7;

[0125] Figure 21 is a schematic diagram of the battery assembly in Example 11;

[0126] Figure 22 is a cross-sectional view of the battery assembly in Example 12;

[0127] Figure 23 is a structural schematic diagram of a pole post adapter body in Embodiment 14;

[0128] Figure 24 is a structural schematic diagram of another pole post adapter body in Example 14;

[0129] Figure 25 is a structural schematic diagram of the main body of the pole adapter in Example 15;

[0130] Figure 26 is an exploded structural diagram of the main body of the pole adapter in Example 16;

[0131] Figure 27 is a structural schematic diagram of the main body of the pole adapter in Example 16;

[0132] Figure 28 is an exploded structural diagram of the main body of the pole adapter in Example 17;

[0133] Figure 29 is a structural schematic diagram of the main body of the pole adapter in Example 17;

[0134] Figure 30 is an exploded structural diagram of the main body of a pole post adapter in Example 18;

[0135] Figure 31 is a structural schematic diagram of a pole post adapter body in Embodiment 18;

[0136] Figure 32 is a structural schematic diagram of another pole post adapter body in Embodiment 18;

[0137] Figure 33 is an exploded structural diagram of the main body of the third type of pole adapter in Example 18;

[0138] Figure 34 is a structural schematic diagram of the main body of the third type of pole adapter in Example 18;

[0139] Figure 35 is a schematic diagram of the structure of a single battery component in Example 19;

[0140] Figure 36 is a schematic diagram of the battery assembly in Example 20.

[0141] The attached figures are labeled as follows:

[0142] 1. Electrical connection plate; 11. Plate body; 112. Blind hole; 113. Through hole; 114. Heat-conducting pillar; 115. Adhesive layer; 12. First welded part; 121. First inclined surface; 13. Folded edge; 131. Third inclined surface; 14. Second through groove; 15. Third step structure; 16. Electrical connection surface; 17. First step structure; 18. Second step structure; 19. Limiting rib; 2. Single cell; 21. Polar terminal; 211. Terminal post; 212. Terminal post extension; 213. First through groove; 214. Second inclined surface; 215. Terminal post extension body; 3. Heat exchanger; 4. Shell; 41. Electrolyte sharing chamber; 42. Gas sharing chamber; 43. Clearance hole; 44. Explosion relief channel; 5. Single cell component. Detailed Implementation

[0143] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0144] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0145] In the description of this invention, it should be noted that the terms "top," "bottom," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0146] This invention discloses an electrical connection plate that can be welded to the terminals of different battery polarities in a battery assembly to achieve electrical connection between batteries. To improve welding reliability and electrical connection stability, this invention employs a butt welding process. Specifically, the electrical connection plate has a first welding portion, which is positioned opposite to a second welding portion on the battery polarity terminal, forming a joint before welding.

[0147] Compared to screw connections, butt welding offers several advantages. In terms of connection strength, screw connections rely on threaded fastening, and long-term vibration or thermal expansion and contraction can easily cause the screws to loosen, affecting the stability of the electrical connection. Butt welding, on the other hand, forms a permanent connection through interatomic bonding, eliminating the risk of loosening. Regarding conductivity, screw connections have contact resistance, increasing energy loss. The continuous weld seam formed by butt welding has lower resistance and higher current transmission efficiency. From a space utilization perspective, screw connections require reserved space for mounting holes and nuts, while butt welding requires no additional space, allowing for a more compact battery module structure.

[0148] Compared to traditional lap welding, butt welding also has significant advantages: butt welding can make the stress distribution in the welding area more uniform, effectively reducing the risk of weld cracking caused by stress concentration; at the same time, the weld seam formed by butt welding is smooth, which reduces resistance loss, improves the conductivity and stability of electrical connection, and extends the battery life.

[0149] It should be noted that:

[0150] 1. The polar terminal of the present invention can be a battery terminal post, or it can be an integral structure of a battery terminal post and a terminal post extension member connected thereto.

[0151] 2. The "electrical connection" in "achieving electrical connection between batteries" mentioned above can be either parallel or series. When it is parallel, two electrical connection plates can be used, one of which is welded to the positive terminal of all batteries, and the other is welded to the negative terminal of all batteries. When it is series, multiple electrical connection plates can be used, with each electrical connection plate having its two ends welded to the terminals of adjacent batteries of different polarities.

[0152] 3. The first welding portion mentioned above is typically a planar area on the electrical connection board; it can be located on one side of the electrical connection board, or it can be set on both sides of the electrical connection board according to actual needs. The second welding portion mentioned above is a planar area on the polarity terminal corresponding to the first welding portion mentioned above.

[0153] 4. The above-mentioned electrical connection plate can be used only as an electrical connection component to realize the electrical connection between batteries; or a functional structure can be set on the electrical connection plate to cooperate with the heat exchanger fixed on the polarity terminal. Based on the functional structure, downward pressure is applied to the heat exchanger to ensure that the heat exchanger is in full contact with the polarity terminal, which significantly improves the heat exchange effect of the heat exchanger.

[0154] For ease of description, in this invention, the electrical connection plate is divided into two functional areas according to different functions: an electrical connection part and a clamping part. The electrical connection part is welded to the polarity terminals, and its core function is to achieve a reliable electrical connection between batteries; the clamping part includes the above-mentioned functional structure, and its core function is to apply downward pressure to the heat exchange component to improve the heat exchange effect.

[0155] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0156] Example 1

[0157] In this embodiment, the electrical connection plate 1 is used only as a single electrical connection component, that is, it only includes the electrical connection part, and its structure is shown in Figure 1. It can be seen that the electrical connection plate 1 (electrical connection part) includes a plate body 11, which is a long strip-shaped structure. Its cross-section is usually designed as rectangular, and the size can be customized according to actual needs. In other embodiments, its cross-sectional shape can be a semi-circular, trapezoidal, or other irregular structure.

[0158] For ease of description, the length direction of the main body 11 is defined as the x-direction, the width direction of the main body 11 is defined as the y-direction, and the thickness direction of the main body 11 is defined as the z-direction.

[0159] In this embodiment, the two sides of the top surface of the main body 11 in the width direction are respectively used as a first welding part 12; correspondingly, the polar terminal 21 adapted to it is also provided with two second welding parts; each first welding part 12 is respectively arranged opposite to a second welding part to form a joint, and the joint is welded together.

[0160] Figures 2 and 3 show a schematic diagram and a cross-sectional view of the battery assembly in this embodiment, respectively, including 13 individual cells 2 arranged along the x-direction and the aforementioned electrical connection plate 1.

[0161] In this embodiment, the single battery cell 2 is a prismatic battery. In other embodiments, the number of single battery cells 2 can be adjusted according to actual needs, and the shape of the single battery cell 2 can also be adjusted according to actual needs.

[0162] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0163] Figure 2 shows an example of connecting individual cells 2 in series using an electrical connection plate 1. The battery assembly includes multiple electrical connection plates 1, each of which is welded to the polarity terminals 21 of the adjacent individual cells 2 of different polarities, thereby realizing the series connection between the individual cells 2.

[0164] Specifically, referring to Figure 3, it can be seen that in this embodiment, a first through groove 213 is opened in the polarity terminal 21. During assembly, the two ends of each electrical connection plate 1 are respectively embedded in the first through groove 213 of the polarity terminal 21 of the adjacent single cell 2 (for the sake of easy display of the first through groove 213, the electrical connection plate 1 is not shown in one side of the polarity terminal 21 in Figure 3). The top surface of the plate body 11 is flush with the top end face of the side wall of the first through groove 213 (the top end face of the side wall of the first through groove 213 is the top end face of the polarity terminal). At the joint of the two, a butt welding process is used for welding (area shown in Figure 3a).

[0165] It should be noted that the term "aligned connection" mentioned above has the following two meanings:

[0166] 1. The top surface of the plate body 11 and the top end face of the side wall of the first through groove 213 are located on the same plane;

[0167] 2. A controllable height difference is allowed between the top surface of the plate body 11 and the top end face of the side wall of the first through groove 213. This height difference is within the range required for the seam welding process to achieve reliable welding.

[0168] By using butt welding, a tight bond can be achieved between the electrical connection plate 1 and the polarity terminal 21. Compared to other connection methods, such as simple mechanical fixing, butt welding eliminates the tiny gaps at the connection points, greatly reducing contact resistance and significantly improving the conductivity between the two. Simultaneously, butt welding results in a more uniform stress distribution in the welding area, effectively reducing the risk of weld cracking due to stress concentration. The resulting weld is smooth, reducing resistance loss, improving the conductivity and stability of the electrical connection, and extending the battery's lifespan.

[0169] In addition, the first through slot 213 structure of the polarity terminal 21 also plays a precise limiting role for the electrical connection plate 1, helping to improve assembly accuracy and connection reliability.

[0170] In some other embodiments, as shown in FIG4, a stepped structure can be provided on the polarity terminal 21, with the bottom surface of the electrical connection plate 1 overlapping the stepped surface, and the top surface of the electrical connection plate 1 being flush with the top surface of the polarity terminal 21 to form a welding connection surface, which is welded in the area shown in b of FIG4. FIG4 uses a single-sided welding method, and compared with this embodiment, the connection strength between the electrical connection plate and the polarity terminal is weaker.

[0171] As shown in Figure 5, this embodiment can further improve the above-mentioned welding structure in the following ways to further optimize the welding effect:

[0172] A first bevel 121 is machined at the edge where the outer wall of the electrical connection plate 1 (the outer wall of the electrical connection plate 1 is a side wall parallel to the xz plane) intersects with the top surface. Simultaneously, a second bevel 214 is correspondingly provided on the inner wall of the first through groove 213 of the polarity terminal 21. When the electrical connection plate 1 is embedded in the first through groove 213, the first bevel 121 and the second bevel 214 are positioned opposite each other, forming a V-shaped welding area between them, as shown in region c of Figure 5. During welding, the solder can fully fill this V-shaped area. This V-shaped welding area design greatly increases the welding area, thereby achieving a high-strength electrical connection between the electrical connection plate 1 and the polarity terminal 21, effectively improving the reliability and stability of the battery assembly's electrical connection.

[0173] During assembly, the electrical connection plate 1 is first aligned with the first through slot 213, allowing it to smoothly embed into the corresponding polarity terminal 21. After this step, the electrical connection plate 1 and the polarity terminal 21 are initially positioned. Next, the top surface of the electrical connection plate 1 is welded to the top surface of the side wall of the first through slot 213 using a V-shaped welding area, thus fixing the electrical connection plate 1 to all polarity terminals 21.

[0174] Example 2

[0175] Similar to Embodiment 1, the electrical connection plate 1 in this embodiment is also used as a single electrical connection component, that is, it only includes the electrical connection part, and its structure is shown in Figure 6. It can be seen that, unlike Embodiment 1, the electrical connection plate 1 (electrical connection part) in this embodiment includes a plate body 11 and two folded edges 13. The two folded edges 13 are respectively arranged on both sides of the plate body 11 in the width direction and extend along its length direction, and both folded edges 13 are folded away from the plate body 11. Without increasing the thickness of the plate body, the overall rigidity of the electrical connection plate is enhanced, making it more resistant to deformation under complex working conditions.

[0176] In this embodiment, the top surfaces of the two folded edges 13 are each used as a first welding part 12; correspondingly, the polarity terminal 21 adapted to it is also provided with two second welding parts; the two first welding parts 12 are respectively arranged opposite to the two second welding parts to form a joint, and are welded together at the joint. The top surface of the folded edge 13 is a plane on the folded edge 13 that is parallel to the xy plane and away from the battery.

[0177] Figures 7 and 8 show a schematic diagram and a cross-sectional view of the battery assembly in this embodiment, respectively, including 12 individual cells 2 arranged along the x-direction and the aforementioned electrical connection plate 1.

[0178] In this embodiment, the single battery cell 2 is a prismatic battery. In other embodiments, the number of single battery cells 2 can be adjusted according to actual needs, and the shape of the single battery cell 2 can also be adjusted according to actual needs.

[0179] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0180] Figure 7 shows an example of parallel connection between individual cells 2 using an electrical connection plate 1. It includes two electrical connection plates 1, which are welded to all positive terminals 21 and all negative terminals 21 respectively, to achieve parallel connection between the individual cells 2.

[0181] Specifically, referring to Figure 8, a first through slot 213 can be formed in the polarity terminal 21. During assembly, one electrical connection plate 1 is embedded in the first through slot 213 of all positive polarity terminals 21, and the other electrical connection plate 1 is embedded in the first through slot 213 of all negative polarity terminals 21. The top surface of the folded edge 13 in the electrical connection plate 1 is flush with the top end face of the side wall of the first through slot 213 of each polarity terminal 21, and welding is performed at the joint, as shown in area d in Figure 8. Through butt welding, a tight connection between the electrical connection plate 1 and the polarity terminal 21 can be achieved.

[0182] Compared to the electrical connection plate 1 in Embodiment 1, the electrical connection plate 1 in this embodiment only needs to have part of its structure embedded in the first through slot 213.

[0183] In some other embodiments, as shown in FIG9, the electrical connection plate 1 can adopt a single-sided folded edge 13 structure, which is used in conjunction with the stepped limiting structure of the polarity terminal 21. Specifically, the electrical connection plate 1 has a folded edge 13 extending in the x-direction only on one edge of the plate body 11 in the width direction. The top surface of the folded edge 13 is flush with the top surface of the polarity terminal 21, forming a welding connection surface, as shown in area e in FIG9. At the same time, a stepped structure is provided at the corresponding position of the polarity terminal 21. The horizontal surface of the step is closely fitted with the bottom surface of the folded edge 13, limiting the plate body 11. Compared with this embodiment, the connection strength between the electrical connection plate and the polarity terminal is weaker.

[0184] As shown in Figure 10, this embodiment can further optimize the above welding structure by machining a third inclined surface 131 on the outer wall of the folded edge 13 (the outer wall of the folded edge 13 is a side wall parallel to the xz plane), and simultaneously providing a second inclined surface 214 on the inner wall of the first through groove 213 of the polarity terminal 21. When the electrical connection plate 1 is embedded in the first through groove 213, the third inclined surface 131 and the second inclined surface 214 are positioned opposite each other, forming a welding area with a V-shaped cross-section between them, as shown in area f in Figure 10. During the welding operation, the solder can fully fill the V-shaped area. This V-shaped welding area design greatly increases the welding area, thereby achieving a high-strength electrical connection between the electrical connection plate 1 and the polarity terminal 21, effectively improving the reliability and stability of the battery assembly's electrical connection.

[0185] During assembly, the electrical connection plate 1 is first aligned with the first through slot 213, allowing it to smoothly embed into the first through slot 213 of each polarity terminal 21. After this step, the electrical connection plate 1 and the polarity terminals 21 are initially positioned. Next, the top surface of the folded edge 13 is welded to the top surface of the side wall of the first through slot 213 through the V-shaped welding area, completing the fixation of the electrical connection plate 1 to all polarity terminals 21.

[0186] Example 3

[0187] Unlike the above embodiments, the electrical connection plate 1 in this embodiment is provided with a pressing part and a heat exchange component 3 is provided on the polar terminal 21 of the battery assembly. The electrical connection plate 1 in this embodiment can not only realize the electrical connection between each individual battery 2 in the battery assembly, but also apply downward pressure to the heat exchange component 3 after the electrical connection plate 1 is installed and fixed, so as to ensure that the heat exchange component 3 is in full contact with the polar terminal 21, which significantly improves the heat exchange effect of the heat exchange component 3.

[0188] As shown in Figure 11, based on the electrical connection plate 1 of Embodiment 1, a second through groove 14 extending along its length is provided on the electrical connection plate 1. The size and shape of the inner surface of the second through groove 14 are adapted to the outer wall of the heat exchanger 3 installed on the polar terminal 21.

[0189] As shown in Figures 12 and 13, to adapt to the battery assembly with the electrical connection plate 1 shown in Figure 11, the heat exchanger 3 is embedded in the first through slot 213 of the polarity terminal 21. Each electrical connection plate 1 extends along the x-direction and is embedded in the first through slot 213 of the corresponding polarity terminal 21. The second through slot 14 presses against the outer wall of the heat exchanger 3. The top surface of the electrical connection plate 1 is welded to the top surface of the side wall of the first through slot 213, thus completing the fixation of all electrical connection plates 1 to the polarity terminal 21. Through this assembly method, not only is the series connection between each individual battery cell 2 realized, but after the electrical connection plate 1 is installed and fixed, it can also apply downward pressure to the heat exchanger 3 to ensure that the heat exchanger 3 is in full contact with the polarity terminal 21, further improving the heat exchange effect of the heat exchanger 3. At the same time, it achieves reliable positioning of the heat exchanger 3 in the through slot of the polarity terminal 21, ensuring the heat dissipation performance and stability of the battery assembly during operation.

[0190] As shown in Figures 14 and 15, based on the electrical connection plate 1 of Embodiment 2, a second through groove 14 extending along its length is provided on the electrical connection plate 1. The size and shape of the inner surface of the second through groove 14 are adapted to the outer wall of the heat exchanger 3 installed on the polar terminal 21. The second through groove 14 is located between the two folded edges 13.

[0191] As shown in Figures 16 and 17, to adapt to the battery assembly with the electrical connection plate 1 shown in Figure 14, the heat exchanger 3 is embedded in the first through slot 213 of the polarity terminal 21. One electrical connection plate 1 is embedded in the first through slot 213 of all positive polarity terminals 21 on one side, and another electrical connection plate 1 is embedded in the first through slot 213 of all negative polarity terminals 21 on one side. The inner surface of the second through slot 14 is tightly fitted to the outer wall of the heat exchanger 3, and the top surface of the folded edge 13 is welded to the top surface of the side wall of the first through slot 213, thus completing the fixation of the electrical connection plate 1 to all polarity terminals 21. Through this assembly method, not only is the parallel connection between each individual battery cell 2 realized, but after the electrical connection plate 1 is installed and fixed, it can also apply downward pressure to the heat exchanger 3 to ensure that the heat exchanger 3 is in full contact with the polarity terminal 21, further improving the heat exchange effect of the heat exchanger 3. At the same time, it achieves reliable positioning of the heat exchanger 3 in the through slot of the polarity terminal 21, ensuring the heat dissipation performance and stability of the large-capacity battery assembly during operation.

[0192] As can be seen from Figures 11 to 17, in this embodiment, the heat exchanger 3 is a pipe section with a circular cross-section. In order to adapt to it and effectively apply downward pressure, the inner surface of the pressing part (i.e., the second through groove 14) is an arc surface adapted to the circular pipe section.

[0193] In some other embodiments, if the heat exchanger 3 is a tube segment with a rectangular cross-section, the inner surface of the second through groove 14 that is adapted to it should be designed as a rectangular plane that is adapted to it. In addition, if the heat exchanger 3 is a tube segment with a rectangular cross-section and the main body of the electrical connection plate has a rectangular cross-section, the second through groove 14 can be omitted, and the bottom surface of the electrical connection plate 1 can be used as a pressing part to apply downward pressure to the heat exchanger 3.

[0194] Example 4

[0195] As shown in Figure 18, this embodiment discloses a battery assembly. Unlike the battery assemblies in the above embodiments, the battery assembly in this embodiment includes a battery and two electrical connection plates as in any of the above embodiments. Figure 18 uses an electrical connection plate from embodiment 3 as an example.

[0196] The battery includes a casing 4 and m electrode assemblies disposed inside the casing 4. In this embodiment, m equals 12, but in other embodiments, the number of electrodes can be selected according to actual needs.

[0197] It should be noted that the electrode assembly here refers to the battery cell, a component inside the casing of a single battery cell, and should not be understood as the single battery cell itself. Furthermore, it can be a wound core or a cell manufactured by stacking. Generally, the electrode assembly includes at least a positive electrode, a separator, a negative electrode, and tabs connected to the positive and negative electrode respectively. For ease of description, this embodiment refers to the tab on the positive electrode as the positive electrode tab and the tab on the negative electrode as the negative electrode tab.

[0198] In this embodiment, the top plate of the outer casing is provided with 2n polarity terminals, where n equals 12. 12 of these terminals serve as the positive polarity terminals of the battery assembly, and the other 12 serve as the negative polarity terminals of the battery assembly.

[0199] Twelve electrode assemblies are arranged in the housing along the first direction, and the positive and negative tabs of each electrode assembly are respectively connected to the positive and negative terminals on the top plate of the housing.

[0200] It should be noted that in this embodiment, the number of polarity terminals is consistent with the number of tabs, that is, n and m are the same, and each tab is connected to the corresponding polarity terminal. In some other embodiments, the number of polarity terminals may be less than the number of tabs, that is, n is less than m. In this case, multiple electrode assembly tabs can be connected in parallel using a copper busbar, and then the copper busbar can be connected to the polarity terminals of the corresponding polarity.

[0201] In this embodiment, the 24 polar terminals are divided into two groups. One group of 12 polar terminals is arranged at intervals along the length of the top plate of the outer casing on one side of the width of the top plate of the outer casing, and the other group of 12 polar terminals is arranged at intervals along the length of the top plate of the outer casing on the other side of the width of the top plate of the outer casing. The way the polar terminals are installed on the outer casing is the same as the way the upper poles and the upper cover plate of the existing square lithium battery upper cover assembly are installed.

[0202] Two heat exchangers are connected to terminals of different polarities, and the heat exchangers are used to conduct the heat from the polarity terminals on each electrode assembly where the heat is most concentrated to the outside for heat dissipation.

[0203] Two electrical connection plates are parallel to each other and both extend along a first direction; the first welding part of one electrical connection plate is arranged opposite to the second welding part on one side of 12 positive terminals to form a joint, and is welded together at the joint; the first welding part of the other electrical connection plate is arranged opposite to the second welding part on another 12 negative terminals to form a joint, and is welded together at the joint; thus realizing the parallel connection between the 12 electrode assemblies.

[0204] The specific electrical connection plate structure, polarity terminals and electrical connection plate, and heat exchanger installation structure are the same as those in the above embodiments, and will not be repeated here.

[0205] Example 5

[0206] This embodiment discloses a battery assembly, including a high-capacity battery and two electrical connection plates as described in embodiments 1 to 3 above. The high-capacity battery is mainly composed of multiple individual cells; the internal cavities of the multiple individual cells are interconnected, and the electrolyte and / or gas are shared among the individual cells; the two electrical connection plates are welded to the positive and negative terminals of all individual cells respectively, realizing the parallel connection between the individual cells.

[0207] It should be noted that:

[0208] The aforementioned high-capacity batteries can include at least the following two types:

[0209] Type 1 high-capacity batteries:

[0210] The first type of high-capacity battery includes n individual cells arranged along a first direction, where n is an integer greater than 1; the internal cavities of the n individual cells are interconnected. Specifically, the electrolyte regions of the internal cavities of multiple individual cells can be connected based on at least one electrolyte sharing pipeline to achieve electrolyte sharing, reduce the differences between individual cells, and optimize the cycle performance of the high-capacity battery; the gas regions of the internal cavities of multiple individual cells can also be connected based on a gas sharing pipeline to achieve gas balance and further optimize the cycle performance of the high-capacity battery.

[0211] For ease of description, the arrangement direction of individual cells is defined as the x-direction in this invention; the height direction of individual cells is defined as the z-direction; and the direction perpendicular to both the x and z directions is defined as the y-direction.

[0212] Type II high-capacity batteries:

[0213] The second type of high-capacity battery includes a casing and n individual cells; the n individual cells are arranged along the x-direction and placed inside the casing cavity.

[0214] The outer casing is equipped with an explosion vent, through which thermal runaway fumes are discharged.

[0215] This invention does not specifically limit the above-mentioned shell structure, but at least the following two structures can be adopted:

[0216] The first structure includes a first cylinder with open ends (i.e., the port parallel to the yz plane is an open end) and end plates fixed to the two open ends of the first cylinder (i.e., the end plates are parallel to the yz plane).

[0217] The second structure includes a second cylinder with open ends at the top and bottom (i.e., the port parallel to the xy plane is the open end) and a top plate and a bottom plate respectively fixed to the open ends at the top and bottom of the second cylinder (i.e., the top plate and the bottom plate are both parallel to the xy plane, and the bottom plate or the top plate can be an integral structure with the second cylinder).

[0218] The top plate of the outer casing (here, the top plate of the first cylindrical body in the first structure, and the top plate in the second structure) has clearance holes corresponding to the polarity terminals of each individual battery cell; the polarity terminals of each individual battery cell extend out of the corresponding clearance holes, and the area corresponding to each clearance hole on the top plate of the outer casing is sealed to the top cover plate of the corresponding individual battery cell. The area corresponding to the clearance hole can be the wall of the clearance hole, or it can be the area surrounding the clearance hole on the top plate of the outer casing.

[0219] Inside the casing, the internal cavities of each individual cell are interconnected, enabling electrolyte sharing and / or gas balance, thereby reducing the differences between individual cells within the casing and improving the performance of high-capacity batteries.

[0220] The internal cavities of individual cells can usually be connected through a shared chamber located within the casing.

[0221] It should be noted that:

[0222] The aforementioned shared chamber can be an electrolyte sharing chamber, with its inner cavity connected to the inner cavities of each individual battery cell. This shared chamber ensures that each individual battery cell operates within a uniform electrolyte environment, guaranteeing electrolyte homogeneity and improving the performance and charge-discharge cycle life of the high-capacity battery. The electrolyte sharing chamber described here is a liquid channel extending along the length (x-direction) of the casing between the casing's bottom plate and each individual battery cell. This liquid channel can be integrally formed with the casing's bottom plate or formed by a support structure between the individual battery's lower cover and the casing's bottom plate. It should be noted that in the first type of casing structure, the casing's bottom plate here is the first cylindrical bottom plate; in the second type of casing structure, the casing's bottom plate here is simply the bottom plate.

[0223] The aforementioned shared chamber can also be a gas-sharing chamber located on the top plate of the outer casing, covering the gas inlets on the top of each individual battery cell.

[0224] It should be noted that in the first type of shell structure, the shell top plate here is the first cylinder top plate; in the second type of shell structure, the shell top plate here is the top plate.

[0225] It should also be noted that the gas port here has the following two meanings:

[0226] 1) The gas port is a through hole directly opened on the top cover of the single cell and penetrating the inner cavity of the single cell;

[0227] At this time, the gas-sharing chamber is connected to the gas region of each individual cell through the gas port. Based on the gas-sharing chamber, the gas regions of each individual cell can be connected to achieve gas balance, so that the gas of each individual cell is shared to ensure the consistency of each individual cell and improve the cycle life of the large-capacity battery to a certain extent. When any individual cell experiences thermal runaway, the flue gas in the inner cavity of that individual cell enters the gas-sharing chamber and is discharged through the gas-sharing chamber, improving the safety of the large-capacity battery.

[0228] 2) The gas port is a vent or explosion-proof port installed on the top cover of the individual battery, and a vent membrane is provided at the vent or explosion-proof port.

[0229] At this time, the gas sharing chamber is used as a venting channel. When the venting membrane at the gas port of any single cell is ruptured by the flue gas in the inner cavity, the inner cavity of that single cell is connected to the gas sharing chamber, and the flue gas inside is discharged through the gas sharing chamber, thereby improving the safety of the large-capacity battery.

[0230] The aforementioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each individual battery cell can be placed in a unified electrolyte environment and gas environment, which improves the performance and charge-discharge cycle life of large-capacity batteries.

[0231] Figures 3 and 7 show a schematic diagram and a cross-sectional view of the battery assembly in this embodiment, including a high-capacity battery and two electrical connection plates 1. The high-capacity battery is the first type of high-capacity battery mentioned above. It should be noted that the relevant shared pipelines are not shown in the figures.

[0232] As shown in the figure, the high-capacity battery in this embodiment includes 13 individual cells 2 arranged along the x-direction. In this embodiment, the individual cells 2 are prismatic cells, and each individual cell 2 has an internal cavity including an electrolyte region and a gas region. In other embodiments, the number of individual cells 2 can be adjusted according to actual needs, and the shape of the individual cells 2 can also be adjusted according to actual needs.

[0233] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0234] One electrical connection plate 1 is welded to the positive polarity terminal 21 of all individual cells 2, and the other electrical connection plate 1 is welded to the negative polarity terminal 21 of all individual cells 2, so as to realize the parallel connection between the individual cells 2.

[0235] In this embodiment, the electrical connection plate 1 is used only as a single electrical connection component, that is, it only includes the electrical connection part, and its structure is shown in Figure 1. It can be seen that the electrical connection plate 1 (electrical connection part) includes a plate body 11, which is a long strip-shaped structure. Its cross-section is usually designed as rectangular, and the size can be customized according to actual needs. In other embodiments, its cross-sectional shape can be a semi-circular, trapezoidal, or other irregular structure.

[0236] For ease of description, the length direction of the main body 11 is defined as the x-direction, the width direction of the main body 11 is defined as the y-direction, and the thickness direction of the main body 11 is defined as the z-direction.

[0237] In this embodiment, the two sides of the top surface of the main body 11 in the width direction are respectively used as a first welding part 12; correspondingly, the polar terminal 21 adapted to it is also provided with two second welding parts; the two first welding parts 12 are respectively arranged opposite to the two second welding parts to form a joint, and are welded together at the joint.

[0238] Specifically, referring to Figure 3, it can be seen that in this embodiment, a first through groove 213 is opened in the polarity terminal 21. During assembly, an electrical connection plate 1 is embedded in the first through groove 213 of the positive polarity terminal 21 of all individual batteries 2. The two first welding parts on the electrical connection plate are respectively flush with the top end face of the same side wall of the first through groove 213 of all positive polarity terminals (the top end face of the side wall of the first through groove 213 is the top end face of the polarity terminal). At the joint of the two, a butt welding process is used for welding (area shown in Figure 3a). Another electrical connection plate 1 is embedded in the first through groove 213 of the negative polarity terminals 21 of all individual batteries 2 (for ease of showing the first through groove 213, the electrical connection plate 1 is not shown in the polarity terminals 21 on one side in Figure 3). The two first welding parts on the electrical connection plate are respectively flush with the top end face of the same side wall of the first through groove 213 of all negative polarity terminals (the top end face of the side wall of the first through groove 213 is the top end face of the polarity terminal). At the joint, the two are welded by butt welding process.

[0239] It should be noted that the term "aligned connection" mentioned above has the following two meanings:

[0240] 1. The top end face of the first welded part and the side wall of the first through groove 213 are located on the same plane;

[0241] 2. A controllable height difference is allowed between the first welded part and the top end face of the side wall of the first through groove 213. This height difference is within the range required for the seam welding process to achieve reliable welding.

[0242] By using butt welding, a tight connection can be achieved between the electrical connection plate 1 and the polarity terminal 21. Compared to other connection methods, such as simple mechanical fixing, butt welding eliminates the tiny gaps at the connection points, greatly reducing contact resistance and significantly improving the conductivity between the two. Simultaneously, butt welding results in a more uniform stress distribution in the welding area, effectively reducing the risk of weld cracking due to stress concentration. The resulting weld is smooth, reducing resistance loss, improving the conductivity and stability of the electrical connection, and extending the battery's lifespan. Furthermore, the first through-slot 213 structure of the polarity terminal 21 also provides precise positioning for the electrical connection plate 1, further enhancing assembly accuracy and connection reliability.

[0243] In some other embodiments, as shown in FIG4, a stepped structure can be provided on the polarity terminal 21, with the bottom surface of the electrical connection plate 1 overlapping the stepped surface, and the top surface of the electrical connection plate 1 being flush with the top surface of the polarity terminal 21 to form a welding connection surface, which is welded in the area shown in b of FIG4. FIG4 uses a single-sided welding method, and compared with this embodiment, the connection strength between the electrical connection plate and the polarity terminal is weaker.

[0244] As shown in Figure 5, this embodiment can further improve the above-mentioned welding structure in the following ways to further optimize the welding effect:

[0245] A first bevel 121 is machined at the edge where the outer wall of the electrical connection plate 1 (the outer wall of the electrical connection plate 1 is a side wall parallel to the xz plane) intersects with the top surface. Simultaneously, a second bevel 214 is correspondingly provided on the inner wall of the first through groove 213 of the polarity terminal 21. When the electrical connection plate 1 is embedded in the first through groove 213, the first bevel 121 and the second bevel 214 are positioned opposite each other, forming a V-shaped welding area between them, as shown in region c of Figure 5. During welding, the solder can fully fill this V-shaped area. This V-shaped welding area design greatly increases the welding area, thereby achieving a high-strength electrical connection between the electrical connection plate 1 and the polarity terminal 21, effectively improving the reliability and stability of the battery assembly's electrical connection.

[0246] During assembly, the electrical connection plate 1 is first aligned with the first through slot 213, allowing it to smoothly embed into the corresponding polarity terminal 21. After this step, the electrical connection plate 1 and the polarity terminal 21 are initially positioned. Next, the top surface of the electrical connection plate 1 is welded to the top surface of the side wall of the first through slot 213 using a V-shaped welding area, thus fixing the electrical connection plate 1 to all polarity terminals 21.

[0247] Example 6

[0248] Unlike the battery assembly in Embodiment 5, this embodiment uses an electrical connection board 1 with a different structure to achieve parallel connection between the individual battery cells 2.

[0249] The structure of the electrical connection plate 1 is shown in Figure 6. Similar to Embodiment 5, the electrical connection plate 1 in this embodiment is also used as a single electrical connection component, that is, it only includes the electrical connection part. It can be seen that, unlike Embodiment 1, the electrical connection plate 1 (electrical connection part) in this embodiment includes a plate body 11 and two folded edges 13. The two folded edges 13 are respectively arranged on both sides of the width direction of the plate body 11 and extend along its length direction. Both folded edges 13 are folded away from the plate body 11.

[0250] In this embodiment, the top surfaces of the two folded edges 13 are each used as a first welding part 12; correspondingly, the polarity terminal 21 adapted to it is also provided with two second welding parts; the two first welding parts 12 are respectively arranged opposite to the two second welding parts to form a joint, and are welded together at the joint. The top surface of the folded edge 13 is a plane on the folded edge 13 that is parallel to the xy plane and away from the battery.

[0251] Figures 7 and 8 show a schematic diagram and a cross-sectional view of the large-capacity battery in this embodiment, respectively. During assembly, one electrical connection plate 1 is embedded in the first through-slot 213 of the positive polarity terminal 21 of all individual cells 2, and another electrical connection plate 1 is embedded in the first through-slot 213 of the negative polarity terminal 21 of all individual cells 2. The top surface of the folded edge 13 in the electrical connection plate 1 is flush with the top end face of the side wall of the first through-slot 213 of the corresponding polarity terminal 21, and welding is performed at the joint, as shown in area d in Figure 8. Through butt welding, a tight connection between the electrical connection plate 1 and the polarity terminal 21 can be achieved.

[0252] Compared to the electrical connection plate 1 in Embodiment 5, the electrical connection plate 1 in this embodiment only requires a portion of its structure to be embedded in the first through slot 213. Furthermore, the addition of the folded edge enhances the overall rigidity of the electrical connection plate without increasing the thickness of the main body, making it more resistant to deformation under complex working conditions.

[0253] In some other embodiments, as shown in FIG9, the electrical connection plate 1 may adopt a single-sided folded edge 13 structure, which is used in conjunction with the stepped limiting design of the polarity terminal 21. Specifically, the electrical connection plate 1 has a folded edge 13 extending in the x-direction only on one edge of the plate body 11 in the width direction. The top surface of the folded edge 13 is flush with the top surface of the polarity terminal 21 to form a welding connection surface, as shown in area e in FIG9. At the same time, a stepped structure is provided at the corresponding position of the polarity terminal 21. The horizontal surface of the step is in close contact with the bottom surface of the folded edge 13 to limit the plate body 11.

[0254] As shown in Figure 10, this embodiment can further optimize the above welding structure by machining a third inclined surface 131 on the outer wall of the folded edge 13 (the outer wall of the folded edge 13 is a side wall parallel to the xz plane), and simultaneously providing a second inclined surface 214 on the inner wall of the first through groove 213 of the polarity terminal 21. When the electrical connection plate 1 is embedded in the first through groove 213, the third inclined surface 131 and the second inclined surface 214 are positioned opposite each other, forming a welding area with a V-shaped cross-section between them, as shown in area f in Figure 10. During the welding operation, the solder can fully fill the V-shaped area. This V-shaped welding area design greatly increases the welding area, thereby achieving a high-strength electrical connection between the electrical connection plate 1 and the polarity terminal 21, effectively improving the reliability and stability of the battery assembly's electrical connection.

[0255] During assembly, the electrical connection plate 1 is first aligned with the first through slot 213, allowing it to smoothly embed into the corresponding polarity terminal 21. After this step, the electrical connection plate 1 and the polarity terminal 21 are initially positioned. Next, the top surface of the folded edge 13 is welded to the top surface of the side wall of the first through slot 213 through the V-shaped welding area, completing the fixation of the electrical connection plate 1 and all polarity terminals 21.

[0256] Example 7

[0257] As shown in Figures 19 and 20, this is the battery assembly of this embodiment. Its structure differs from the battery assemblies in embodiments 5 and 6 above in that the large-capacity battery is the second type of large-capacity battery mentioned above.

[0258] In this embodiment, the second type of high-capacity battery arranges 12 individual battery cells 2 inside the outer casing 4. Each terminal extension 212 passes through the clearance hole 43 and connects to the corresponding terminal 211. The portion of the terminal extension 212 with the first through groove 213 is located outside the outer casing 4. An electrical connection plate 1 is fixed in the first through groove 213 of the terminal extension 212 located on the same side and of the same polarity. The structure of the electrical connection plate 1, the structure of the terminal extension 212, and the installation structure between the terminal extension 212 and the electrical connection plate 1 are all the same as in the above embodiment, and will not be described again here. Figures 11 and 12 use the electrical connection plate 1 structure in embodiment 6 as an example.

[0259] A support extending in the x-direction is provided between the bottom plate of the outer casing 4 and each individual battery cell 2 to form a liquid channel, serving as a shared electrolyte chamber 41.

[0260] On the top plate of the outer casing 4, a boss extending in the x direction may also be provided, and a gas channel is opened on the boss, which serves as a gas sharing chamber 42.

[0261] Example 8

[0262] Unlike the above embodiments, this embodiment of the large-capacity battery adds a heat exchange component 3 on the basis of the above embodiments. Correspondingly, the electrical connection plate 1 is provided with a pressing part on the basis of the above embodiments. The electrical connection plate 1 can not only realize the parallel connection between each individual cell 2 in the large-capacity battery, but also apply downward pressure to the heat exchange component 3 after the electrical connection plate 1 is installed and fixed, so as to ensure that the heat exchange component 3 is in full contact with the polar terminal 21, which significantly improves the heat exchange effect of the heat exchange component 3.

[0263] As shown in Figure 11, based on the electrical connection plate 1 of Embodiment 5, a second through groove 14 extending along its length is provided on the electrical connection plate 1. The size and shape of the inner surface of the second through groove 14 are adapted to the outer wall of the heat exchanger 3 installed on the polar terminal 21.

[0264] As shown in Figure 13, for a battery assembly adapted to the electrical connection plate 1 shown in Figure 11 (taking the large-capacity battery assembly of Embodiment 5 with heat exchanger 3 as an example), the heat exchanger 3 is embedded in the first through slot 213 of the polarity terminal 21. Each electrical connection plate 1 extends along the x-direction and is embedded in the first through slot 213 of the corresponding polarity terminal 21. The second through slot 14 presses against the outer wall of the heat exchanger 3. The top surface of the electrical connection plate 1 is welded to the top end face of the side wall of the first through slot 213, thus completing the fixation of all electrical connection plates 1 and polarity terminals 21. Through this assembly method, not only is the parallel connection between each individual battery 2 realized, but after the electrical connection plate 1 is installed and fixed, it can also apply downward pressure to the heat exchanger 3 to ensure that the heat exchanger 3 is in full contact with the polarity terminal 21, further improving the heat exchange effect of the heat exchanger 3. At the same time, it achieves reliable positioning of the heat exchanger 3 in the first through slot 213 of the polarity terminal 21, ensuring the heat dissipation performance and stability of the battery assembly during operation.

[0265] As shown in Figures 14 and 15, based on the electrical connection plate 1 of Embodiment 6, a second through groove 14 extending along its length is provided on the electrical connection plate 1. The size and shape of the inner surface of the second through groove 14 are adapted to the outer wall of the heat exchanger 3 installed on the polar terminal 21. The second through groove 14 is located between the two folded edges 13.

[0266] As shown in Figures 16 and 17, for a battery assembly adapted to the electrical connection plate 1 shown in Figure 14 (taking the addition of a heat exchanger 3 to the battery assembly of Embodiment 6 as an example), the heat exchanger 3 is embedded in the first through slot 213 of the polarity terminal 21. One electrical connection plate 1 is embedded in the first through slot 213 of all positive polarity terminals 21 on one side, and another electrical connection plate 1 is embedded in the first through slot 213 of all negative polarity terminals 21 on one side. The inner surface of the second through slot 14 is tightly fitted to the outer wall of the heat exchanger 3, and the top surface of the folded edge 13 is welded to the top surface of the side wall of the first through slot 213 to complete the fixing of the electrical connection plate 1 to all polarity terminals 21. This assembly method not only enables parallel connection between individual battery cells 2, but also allows the electrical connection plate 1 to apply downward pressure to the heat exchanger 3 after installation and fixation, ensuring full contact between the heat exchanger 3 and the polar terminal 21, further improving the heat exchange effect of the heat exchanger 3. At the same time, it achieves reliable positioning of the heat exchanger 3 in the first through slot 213 of the polar terminal 21, ensuring the heat dissipation performance and stability of the battery assembly during operation.

[0267] As can be seen from Figures 11 to 17, in this embodiment, the heat exchanger 3 is a pipe section with a circular cross-section. In order to adapt to it and effectively apply downward pressure, the inner surface of the pressing part (i.e., the second through groove 14) is an arc surface adapted to the circular pipe section.

[0268] In some other embodiments, if the heat exchanger 3 is a tube segment with a rectangular cross-section, the inner surface of the second through groove 14 that is adapted to it should be designed as a rectangular plane that is adapted to it. In addition, if the heat exchanger 3 is a tube segment with a rectangular cross-section and the main body 11 of the electrical connection plate 1 has a rectangular cross-section, the second through groove 14 can be omitted, and the bottom surface of the electrical connection plate 1 can be used as a pressing part to apply downward pressure to the heat exchanger 3.

[0269] Example 9

[0270] This invention discloses a battery assembly, including a battery module and multiple electrical connection plates. The battery module is mainly composed of multiple individual cells; each electrical connection plate is welded to the polarity terminals of adjacent individual cells of different polarities to realize series connection between individual cells.

[0271] It should be noted that:

[0272] The aforementioned battery modules can include at least the following three types:

[0273] Type 1 battery module:

[0274] The first type of battery module includes n individual batteries arranged along a first direction, where n is an integer greater than 1;

[0275] For ease of description, the arrangement direction of individual cells is defined as the x-direction in this invention; the height direction of individual cells is defined as the z-direction; and the direction perpendicular to both the x and z directions is defined as the y-direction.

[0276] Second type of battery module:

[0277] The second type of battery module, based on the first type of battery module, adds an explosion venting channel. This explosion venting channel extends along the first direction and seals and covers the explosion venting ports of each individual battery cell. Thermal runaway fumes are discharged in an orderly manner from the explosion venting ports through the explosion venting channel, thereby improving the safety performance of the battery module.

[0278] Third type of battery module:

[0279] The third type of battery module, based on the first type of battery module, adds a shell, with multiple individual batteries arranged along the x-direction and placed inside the shell cavity.

[0280] The outer casing is equipped with an explosion vent and an explosion vent channel that connects to the explosion vent. Thermal runaway fumes are discharged in an orderly manner from the explosion vent through the explosion vent channel, thereby improving the safety performance of the battery assembly.

[0281] This invention does not specifically limit the above-mentioned shell structure, but at least the following two structures can be adopted:

[0282] The first structure includes a first cylinder with open ends (i.e., the port parallel to the yz plane is an open end) and end plates fixed to the two open ends of the first cylinder (i.e., the end plates are parallel to the yz plane).

[0283] The second structure includes a second cylinder with open ends at the top and bottom (i.e., the port parallel to the xy plane is the open end) and a top plate and a bottom plate respectively fixed to the open ends at the top and bottom of the second cylinder (i.e., the top plate and the bottom plate are both parallel to the xy plane, and the bottom plate or the top plate can be an integral structure with the second cylinder).

[0284] The top plate of the outer casing (here, the top plate of the first cylindrical body in the first structure, and the top plate in the second structure) has clearance holes corresponding to the polarity terminals of each individual battery cell; the polarity terminals of each individual battery cell extend out of the corresponding clearance holes, and the area corresponding to each clearance hole on the top plate of the outer casing is sealed to the top cover plate of the corresponding individual battery cell. The area corresponding to the clearance hole can be the wall of the clearance hole, or it can be the area surrounding the clearance hole on the top plate of the outer casing.

[0285] Figures 2 and 3 show a schematic diagram and a cross-sectional view of the battery assembly in this embodiment, including a battery module and multiple electrical connection plates 1. The battery module is the first type of battery module described above.

[0286] The battery module includes 13 individual battery cells 2 arranged along the x-direction. In this embodiment, the individual battery cells 2 are prismatic cells. In other embodiments, the number of individual battery cells 2 can be adjusted according to actual needs, and the shape of the individual battery cells 2 can also be adjusted according to actual needs.

[0287] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0288] Each electrical connection plate 1 is welded to the polarity terminals 21 of the adjacent single cell 2 with different polarities, so as to realize the series connection between the individual cells 2.

[0289] In this embodiment, the electrical connection plate 1 is used only as a single electrical connection component, that is, it only includes the electrical connection part, and its structure is shown in Figure 1. It can be seen that the electrical connection plate 1 (electrical connection part) includes a plate body 11, which is a long strip-shaped structure. Its cross-section is usually designed as rectangular, and the size can be customized according to actual needs. In other embodiments, its cross-sectional shape can be a semi-circular, trapezoidal, or other irregular structure.

[0290] In this embodiment, the two edges of the top surface of the main body 11 in the width direction (the width direction is the y direction) are respectively used as a first welding part 12; correspondingly, the polar terminal 21 adapted to it is also provided with two second welding parts; the two first welding parts 12 are respectively arranged opposite to the two second welding parts to form a joint, and are welded together at the joint.

[0291] Specifically, referring to Figure 3, it can be seen that in this embodiment, a first through groove 213 is opened in the polarity terminal 21. During assembly, each electrical connection plate 1 is embedded in the first through groove 213 of the polarity terminal 21 of the adjacent single cell 2 (for the sake of easy display of the first through groove 213, the electrical connection plate 1 is not shown in the polarity terminal 21 on one side in Figure 2). The top surface of the plate body 11 is flush with the top end face of the side wall of the first through groove 213 (the top end face of the side wall of the first through groove 213 is the top end face of the polarity terminal). At the joint of the two, a butt welding process is used for welding (area shown in Figure 3a).

[0292] It should be noted that the term "aligned connection" mentioned above has the following two meanings:

[0293] 1. The top surface of the plate body 11 and the top end face of the side wall of the first through groove 213 are located on the same plane;

[0294] 2. A controllable height difference is allowed between the top surface of the plate body 11 and the top end face of the side wall of the first through groove 213. This height difference is within the range required for the seam welding process to achieve reliable welding.

[0295] By using butt welding, a tight bond can be achieved between the electrical connection plate 1 and the polarity terminal 21. Compared to other connection methods, such as simple mechanical fixing, butt welding eliminates the tiny gaps at the connection points, greatly reducing contact resistance and significantly improving the conductivity between the two. Simultaneously, butt welding results in a more uniform stress distribution in the welding area, effectively reducing the risk of weld cracking due to stress concentration. The resulting weld is smooth, reducing resistance loss, improving the conductivity and stability of the electrical connection, and extending the battery's lifespan.

[0296] In addition, the first through slot 213 structure of the polarity terminal 21 also plays a precise limiting role for the electrical connection plate 1, helping to improve assembly accuracy and connection reliability.

[0297] In some other embodiments, as shown in FIG4, a stepped structure can be provided on the polarity terminal 21, with the bottom surface of the electrical connection plate 1 overlapping the stepped surface, and the top surface of the electrical connection plate 1 being flush with the top surface of the polarity terminal 21 to form a welding connection surface, which is welded in the area shown in b of FIG4. FIG4 uses a single-sided welding method, and compared with this embodiment, the connection strength between the electrical connection plate and the polarity terminal is weaker.

[0298] As shown in Figure 5, this embodiment can further improve the above-mentioned welding structure in the following ways to further optimize the welding effect:

[0299] A first bevel 121 is machined at the edge where the outer wall of the electrical connection plate 1 (the outer wall of the electrical connection plate 1 is a side wall parallel to the xz plane) intersects with the top surface. Simultaneously, a second bevel 214 is correspondingly provided on the inner wall of the first through groove 213 of the polarity terminal 21. When the electrical connection plate 1 is embedded in the first through groove 213, the first bevel 121 and the second bevel 214 are positioned opposite each other, forming a V-shaped welding area between them, as shown in region c of Figure 5. During welding, the solder can fully fill this V-shaped area. This V-shaped welding area design greatly increases the welding area, thereby achieving a high-strength electrical connection between the electrical connection plate 1 and the polarity terminal 21, effectively improving the reliability and stability of the battery assembly's electrical connection.

[0300] During assembly, the electrical connection plate 1 is first aligned with the first through slot 213, allowing it to smoothly embed into the corresponding polarity terminal 21. After this step, the electrical connection plate 1 and the polarity terminal 21 are initially positioned. Next, the top surface of the electrical connection plate 1 is welded to the top end face of the side wall of the first through slot 213 using a V-shaped welding area, thus fixing the electrical connection plate 1 to all polarity terminals 21.

[0301] Example 10

[0302] Unlike the battery assembly in Embodiment 9, this embodiment uses an electrical connection board 1 with a different structure to realize the series connection between each individual battery cell 2.

[0303] The structure of the electrical connection plate 1 is shown in Figure 6. Similar to Embodiment 9, the electrical connection plate 1 in this embodiment is also used as a single electrical connection component, that is, it only includes the electrical connection part. It can be seen that, unlike Embodiment 9, the electrical connection plate 1 (electrical connection part) in this embodiment includes a plate body 11 and two folded edges 13. The two folded edges 13 are respectively arranged on both sides of the width direction (width direction is the y direction) of the plate body 11 and extend along its length direction (length direction is the x direction). Both folded edges 13 are folded away from the plate body 11.

[0304] In this embodiment, the top surfaces of the two folded edges 13 are each used as a first welding part 12; correspondingly, the polarity terminal 21 adapted to it is also provided with two second welding parts; the two first welding parts 12 are respectively arranged opposite to the two second welding parts to form a joint, and are welded together at the joint. The top surface of the folded edge 13 is a plane on the folded edge 13 that is parallel to the xy plane and away from the battery.

[0305] Figure 8 shows a cross-sectional view of the battery module in this embodiment. During assembly, each electrical connection plate 1 is embedded into the first through-slot 213 of the polarity terminals 21 of adjacent single cells 2. The top surface of the folded edge 13 in the electrical connection plate 1 is flush with the top end face of the side wall of the first through-slot 213 of the corresponding polarity terminal 21, and welding is performed at the joint, as shown in area d in Figure 8. Through butt welding, a tight connection between the electrical connection plate 1 and the polarity terminal 21 can be achieved.

[0306] Compared to the electrical connection plate 1 in Embodiment 9, the electrical connection plate 1 in this embodiment only requires a portion of its structure to be embedded in the first through slot 213. Furthermore, the addition of the folded edge enhances the overall rigidity of the electrical connection plate without increasing the thickness of the main body, making it more resistant to deformation under complex working conditions.

[0307] In some other embodiments, as shown in FIG9, the electrical connection plate 1 may adopt a single-sided folded edge 13 structure, which is used in conjunction with the stepped limiting design of the polarity terminal 21. Specifically, the electrical connection plate 1 has a folded edge 13 extending in the x-direction only on one edge of the plate body 11 in the width direction. The top surface of the folded edge 13 is flush with the top surface of the polarity terminal 21 to form a welding connection surface, as shown in area e in FIG9. At the same time, a stepped structure is provided at the corresponding position of the polarity terminal 21. The horizontal surface of the step is in close contact with the bottom surface of the folded edge 13 to limit the plate body 11.

[0308] As shown in Figure 10, this embodiment can further optimize the above welding structure by machining a third inclined surface 131 on the outer wall of the folded edge 13 (the outer wall of the folded edge 13 is a side wall parallel to the xz plane), and simultaneously providing a second inclined surface 214 on the inner wall of the first through groove 213 of the polarity terminal 21. When the electrical connection plate 1 is embedded in the first through groove 213, the third inclined surface 131 and the second inclined surface 214 are positioned opposite each other, forming a welding area with a V-shaped cross-section between them, as shown in area f in Figure 10. During the welding operation, the solder can fully fill the V-shaped area. This V-shaped welding area design greatly increases the welding area, thereby achieving a high-strength electrical connection between the electrical connection plate 1 and the polarity terminal 21, effectively improving the reliability and stability of the battery assembly's electrical connection.

[0309] During assembly, the electrical connection plate 1 is first aligned with the first through slot 213, allowing it to smoothly embed into the corresponding polarity terminal 21. After this step, the electrical connection plate 1 and the polarity terminal 21 are initially positioned. Next, the top surface of the folded edge 13 is welded to the top end face of the side wall of the first through slot 213 via a V-shaped welding area, completing the fixation of the electrical connection plate 1 to all polarity terminals 21.

[0310] Example 11

[0311] As shown in Figure 21, this is the battery assembly of this embodiment. Its structure differs from the battery assembly in the above embodiments in that the battery module is the second type of battery module mentioned above.

[0312] Based on the battery assembly in the above embodiments (Figure 21 takes the addition of an explosion venting channel 44 to the battery assembly of embodiment 9 as an example), an explosion venting channel 44 is added. The explosion venting channel 44 extends along the first direction and seals and covers the explosion venting ports of n individual cells 2. When any individual cell 2 experiences thermal runaway, the thermal runaway flue gas is discharged in an orderly manner through the explosion venting channel 44 for treatment, thereby improving the safety performance of this type of battery assembly.

[0313] Example 12

[0314] Figure 22 shows a cross-sectional view of the battery module in this embodiment. Its structure differs from that of the battery module in the above embodiments in that the battery module is the third type of battery module mentioned above.

[0315] In this embodiment, the third type of battery module arranges multiple individual batteries 2 in the inner cavity of the outer shell 4. Each terminal extension 212 passes through the clearance hole 43 and is connected to the corresponding terminal 211. The part of the terminal extension 212 with the first through groove 213 is located outside the outer shell 4. The polar terminals 21 of different polarities of adjacent individual batteries 2 are welded together by an electrical connection plate 1.

[0316] The specific structure of the electrical connection plate 1, the structure of the pole extension 212, and the installation structure between the pole extension 212 and the electrical connection plate 1 are all the same as in the above embodiments, and will not be described again here. Figure 22 shows an example using the electrical connection plate 1 structure in Embodiment 9.

[0317] It should be noted that, in this embodiment, the pole extension 212 and the top plate of the outer casing 4 maintain a safe electrical conductivity distance.

[0318] On the top plate of the outer casing 4, there is a boss extending in the x direction. An explosion venting channel 44 is opened on the boss. The explosion venting channel 44 covers the explosion vent of each individual battery 2. When any individual battery 2 experiences thermal runaway, the thermal runaway fumes are discharged in an orderly manner through the explosion venting channel 44 to the explosion vent for treatment, thereby improving the safety performance of this type of battery module.

[0319] Example 13

[0320] Unlike the embodiments described above, the battery module in this embodiment adds a heat exchanger 3 based on any of the embodiments described above. Correspondingly, the electrical connection plate 1 is provided with a pressing part based on the embodiments described above. The electrical connection plate 1 can not only realize the series connection between each individual battery 2 in the battery module, but also apply downward pressure to the heat exchanger 3 after the electrical connection plate 1 is installed and fixed, so as to ensure that the heat exchanger 3 is in full contact with the polar terminal 21, which significantly improves the heat exchange effect of the heat exchanger 3.

[0321] As shown in Figure 11, based on the electrical connection plate 1 of Embodiment 9, a second through groove 14 extending along its length is provided on the electrical connection plate 1. The size and shape of the inner surface of the second through groove 14 are adapted to the outer wall of the heat exchanger 3 installed on the polar terminal 21.

[0322] As shown in Figures 12 and 13, for a battery assembly adapted to the electrical connection plate 1 shown in Figure 11 (taking the addition of a heat exchanger 3 to the battery assembly of Embodiment 9 as an example), the heat exchanger 3 is embedded in the first through slot 213 of the polarity terminal 21. Each electrical connection plate 1 extends along the x-direction and is embedded in the first through slot 213 of the corresponding polarity terminal 21. The second through slot 14 presses against the outer wall of the heat exchanger 3. The top surface of the electrical connection plate 1 is welded to the top end face of the side wall of the first through slot 213, thus completing the fixation of all electrical connection plates 1 to the polarity terminal 21. Through this assembly method, not only is the series connection between each individual battery cell 2 realized, but after the electrical connection plate 1 is installed and fixed, it can also apply downward pressure to the heat exchanger 3 to ensure full contact between the heat exchanger 3 and the polarity terminal 21, further improving the heat exchange effect of the heat exchanger 3. At the same time, it achieves reliable positioning of the heat exchanger 3 in the through slot of the polarity terminal 21, ensuring the heat dissipation performance and stability of the battery assembly during operation.

[0323] As shown in Figures 14 and 15, based on the electrical connection plate 1 of Embodiment 10, a second through groove 14 extending along its length is provided on the electrical connection plate 1. The size and shape of the inner surface of the second through groove 14 are adapted to the outer wall of the heat exchanger 3 installed on the polar terminal 21. The second through groove 14 is located between two folded edges 13.

[0324] As shown in Figures 16 and 17, for a battery assembly adapted to the electrical connection plate 1 shown in Figure 15 (taking the addition of a heat exchanger 3 to the battery assembly of Embodiment 10 as an example), the heat exchanger 3 is embedded in the first through slot 213 of the polarity terminal 21. Each electrical connection plate 1 is embedded in the first through slot 213 of the corresponding polarity terminal 21. The inner surface of the second through slot 14 is tightly fitted to the outer wall of the heat exchanger 3. The top surface of the folded edge 13 is welded to the top end face of the side wall of the first through slot 213, thus completing the fixation of the electrical connection plate 1 to all polarity terminals 21. Through this assembly method, not only is the series connection between each individual battery cell 2 realized, but after the electrical connection plate 1 is installed and fixed, it can also apply downward pressure to the heat exchanger 3 to ensure that the heat exchanger 3 is in full contact with the polarity terminal 21, further improving the heat exchange effect of the heat exchanger 3. At the same time, it achieves reliable positioning of the heat exchanger 3 in the through slot of the polarity terminal 21, ensuring the heat dissipation performance and stability of the battery assembly during operation.

[0325] As can be seen from Figures 11 to 17, in this embodiment, the heat exchanger 3 is a pipe section with a circular cross-section. In order to adapt to it and effectively apply downward pressure, the inner surface of the pressing part (i.e., the second through groove 14) is an arc surface adapted to the circular pipe section.

[0326] In some other embodiments, if the heat exchanger 3 is a tube segment with a rectangular cross-section, the inner surface of the second through groove 14 that is adapted to it should be designed as a rectangular plane that is adapted to it. In addition, if the heat exchanger 3 is a tube segment with a rectangular cross-section and the main body 11 of the electrical connection plate 1 has a rectangular cross-section, the second through groove 14 can be omitted, and the bottom surface of the electrical connection plate 1 can be used as a pressing part to apply downward pressure to the heat exchanger 3.

[0327] Example 14

[0328] This embodiment is a terminal extension member 212, the structure of which is shown in Figures 23 and 24. It includes a terminal extension member body 215, which is used to connect to the terminal 211 of the single cell 2 (including the positive terminal and the negative terminal). The terminal extension member body 215 can improve the problem of excessive local heat in the terminal 211 of the single cell 2.

[0329] The main body 215 of the pole extension member connected to the positive pole or the negative pole has the same structure. In this embodiment, the main body 215 of the pole extension member connected to the positive pole is taken as an example.

[0330] As can be seen from the figure, the main body 215 of the pole extension component in this embodiment is a columnar structure. It can be made of metal materials with good electrical and thermal conductivity, such as silver, copper, aluminum, etc. However, considering the cost and the electrical and thermal conductivity, aluminum is generally chosen as the material of the main body 215 of the pole extension component.

[0331] A first through groove 213 for installing the heat exchanger 3 is opened on the main body 215 of the electrode extension member. The bottom of the first through groove 213 is used to fix and connect with the electrode 211 of the single cell 2.

[0332] In this embodiment, the cross-section of the first through groove 213 is not limited, and can be semi-circular (as shown in Figure 23, the bottom of the groove is an arc surface), rectangular (as shown in Figure 24, the bottom of the groove is a plane), etc.

[0333] Preferably, to improve heat dissipation performance, the cross-section of the first through-slot 213 is adapted to the shape of the heat exchanger 3's tube wall. This ensures that after the heat exchanger 3 is installed in the first through-slot 213, its tube wall fits tightly against the inner surface of the first through-slot 213, increasing the contact area between them. A larger contact area means more space for heat transfer, thereby improving heat dissipation efficiency. Furthermore, the tight fit reduces the presence of air gaps. Air is a poor conductor of heat, and air in gaps hinders heat transfer. By eliminating or reducing these gaps, heat conduction efficiency is improved. Simultaneously, the tight fit between the heat exchanger 3 and the first through-slot 213 also increases the stability of the entire structure. In environments with significant vibration or impact, the tight fit prevents the heat exchanger 3 from shaking or shifting, thus ensuring the stability of the heat dissipation effect.

[0334] In this embodiment, the bottom of the first through groove 213 is fixedly connected to the terminal post 211 of the single cell 2 by welding (welding here refers to fusion welding). In some other embodiments, the two can also be fixed by screw connection, bonding or other methods, but the connection reliability is lower than that of this embodiment.

[0335] Example 15

[0336] This embodiment is also a pole post extension 212, the structure of which is shown in Figure 25.

[0337] When the bottom of the first through groove 213 is fixedly connected to the terminal post 211 of the single cell 2 by welding, the flat bottom of the groove facilitates welding and fixing with the terminal post 211. Because the flat surface can provide a larger contact area during the welding process, the weld is more secure, ensuring a stable and reliable connection between the terminal post 211 and the terminal post extension body 215.

[0338] However, the heat exchanger element 3 typically used is a circular tube (with a circular cross-section). When the flat groove bottom is fitted to the circular tube, there are certain disadvantages. The shape of the flat groove bottom does not match the tube wall shape, making it difficult to achieve a tight fit. As a result, in practical applications, the connection between the heat exchanger element 3 and the pole extension body 215 may not be tight enough, thus affecting the thermal conductivity.

[0339] Compared to a flat groove bottom, a curved groove bottom offers greater advantages in fitting a circular tube. The curved groove bottom adapts to the tube wall, allowing for a tight fit when the tube is inserted into the first through groove 213. This tight fit effectively increases the contact area between the heat exchanger 3 and the pole extension body 215, thereby improving thermal conductivity. However, it presents disadvantages in welding and fixing. Due to the irregular shape of the curved surface, it is difficult to find stable welding points, increasing the difficulty and instability of the welding process.

[0340] To address the issue of the curved groove bottom being difficult to fix to the pole post 211, while also fully utilizing the compatibility advantages of the curved groove bottom with the round tube, as shown in Figure 25, this embodiment incorporates a blind hole 112 at the bottom of the curved groove. The bottom of the blind hole 112 is flat, allowing for welding and fixing to the pole post 211. This satisfies the connection requirements between the pole post 211 and the pole post extension body 215, while also improving the compatibility between the curved groove bottom and the round tube.

[0341] To eliminate welding stress, a through hole 113 can be made at the bottom of the blind hole 112 to pass through the blind hole 112.

[0342] Example 16

[0343] This embodiment is also a pole post extension 212, the structure of which is shown in Figures 26 and 27. This embodiment adds a heat-conducting post 114 to the basis of embodiment 15.

[0344] In Embodiment 2, when the diameter of the blind hole 112 is large, a significant gap will exist between the heat exchanger 3 and the blind hole 112 after the heat exchanger 3 is inserted into the first through groove 213. This gap will affect the thermal conductivity between the heat exchanger 3 and the electrode extension body 215, reducing heat transfer efficiency; additionally, it may also affect the electrical conductivity of the electrode extension body 215. To address this, this embodiment employs a method of fixing the heat-conducting column 114. The heat-conducting column 114 is fixed within the blind hole 112 and tightly fitted against the inner wall of the blind hole 112. Its surface away from the bottom of the blind hole 112 is curved to ensure a tight fit with the wall of the heat exchanger 3. By filling the gap between the blind hole 112 and the heat exchanger 3 with the heat-conducting column 114, the thermal conductivity between the heat exchanger 3 and the electrode extension body 215 is improved, and the electrical conductivity of the electrode extension body 215 is optimized. Simultaneously, the heat-conducting column 114 also serves to fix the heat exchanger 3, preventing it from wobbling within the first through groove 213.

[0345] The heat-conducting pillar 114 can be made of metal materials with good electrical and thermal conductivity, such as silver, copper, and aluminum. However, considering both cost and electrical and thermal conductivity, aluminum is generally chosen as the material for the heat-conducting pillar 114.

[0346] Example 17

[0347] This embodiment is also a pole post extension 212, the structure of which is shown in Figures 28 and 29. Unlike embodiment 16, this embodiment adds an adhesive layer 115 on the basis of embodiment 16. The adhesive layer 115 is disposed on the arc surface of the heat-conducting column 114 and the arc surface of the first through groove 213, and is located between the heat exchanger 3 and the heat-conducting column 114 and the first through groove 213.

[0348] The adhesive layer 115 typically uses an adhesive with good thermal conductivity, such as thermal grease or thermal adhesive. Additionally, when the heat exchanger 3 acts as an electrical connector, the adhesive layer 115 should also have electrical conductivity; that is, such adhesives should possess both thermal and electrical conductivity properties.

[0349] In this embodiment, the adhesive layer 115 has at least the following advantages:

[0350] Firstly, in practical applications, the heat exchanger 3 and the pole extension 212 may be subjected to external forces such as vibration and impact. The adhesive layer 115 has a certain degree of elasticity and buffering properties, which can absorb these external forces, reduce the impact on the connection parts, and thus enhance the stability of the heat exchanger 3.

[0351] Secondly, the adhesive layer 115 can, to a certain extent, fix the heat exchanger 3, preventing it from shaking or loosening within the first through groove 213. Especially in environments with high vibration, the adhesive layer 115 can effectively improve the reliability of the connection.

[0352] Thirdly: When the wall of the heat exchanger 3 and / or the arc surface of the heat conduction column 114 and the first through groove 213 have a certain roughness, it will affect the contact area between them. The adhesive layer 115 can better adapt to the shape and roughness of different surfaces, improve the roughness, and achieve more uniform heat conduction.

[0353] Fourthly, the use of adhesive layer 115 reduces the precision requirements for the machining of structures such as heat exchanger 3, pole extension body 215, and heat conduction pillar 114. Even if the surfaces in contact have a certain degree of roughness or dimensional deviation, adhesive layer 115 can still achieve good thermal conductivity. This reduces processing costs and time, and improves production efficiency.

[0354] Example 18

[0355] This embodiment is also a pole extension 212, the structure of which is shown in Figures 30 to 24. Unlike the above embodiments, this embodiment adds an electrical connection plate 1, which can press the heat exchanger 3 onto the pole extension body 215, further improving the stability of the heat exchanger 3, while ensuring a tighter contact between the heat exchanger 3 and the pole extension body 215, thus improving the thermal conductivity.

[0356] Figures 30, 31, and 32 illustrate an example of adding an electrical connection plate 1 to Embodiment 17. Figures 33 and 34 illustrate an example of adding an electrical connection plate 1 to a pole extension body 215 of Embodiment 14.

[0357] As can be seen from Figures 30 to 34, the structure of the electrical connection plate 1 in this embodiment is adapted to the structure of the opening of the first through groove 213. When a round tube is selected as the heat exchanger, a second through groove 14 is also provided on the electrical connection plate 1. The shape of the inner surface of the second through groove 14 is adapted to the shape of the tube wall of the heat exchanger 3.

[0358] In this embodiment, the depth of the first through groove 213 is greater than the size of the heat exchanger 3, and the width of the first through groove 213 is greater than the size of the other parts. This design provides sufficient space for the installation of the heat exchanger 3, allowing it to be easily placed into the first through groove 213, reducing the installation difficulty. The electrical connection plate 1 is fixed in the first through groove 213 and located at the opening. During installation, simply place the heat exchanger 3 along the first through groove 213, install the electrical connection plate 1 to the opening of the first through groove 213 until the wall of the heat exchanger 3 is tightly fitted with the second through groove 14 of the electrical connection plate 1, and then fix the electrical connection plate 1 to the main body 215 of the pole extension. The installation process is simple and convenient.

[0359] Specifically, welding can be used to fix the two components together. As shown in Figure 31, in this embodiment, a first step structure 17 can be provided on two edges of the upper surface of the electrical connection plate 1, where the two edges extend along the length direction of the first through groove 213; at the same time, a second step structure 18 can be provided on two edges of the upper surface of the pole extension body 215, where the two edges are close to the first through groove 213 and extend along the length direction of the first through groove 213; after the electrical connection plate 1 is installed to the opening of the first through groove 213, the step surfaces of the first step structure 17 and the second step structure 18 are located on the same plane, and the step surfaces of the first step structure 17 and the second step structure 18 can be fixed by welding. In addition, as can be seen from Figures 30 and 31, this embodiment can also provide a third step structure 15 on the side wall of the first through groove 213. The step surface is used to cooperate with the electrical connection plate 1 and limit the electrical connection plate 1 in the depth direction of the first through groove 213. Limiting the electrical connection plate 1 in the depth direction of the first through groove 213 can effectively prevent unnecessary displacement of the electrical connection plate 1 during use. For example, when subjected to vibration or external impact, the electrical connection plate 1 will not become loose and affect its tight fit with the heat exchanger 3, thereby ensuring the stability of its electrical and thermal conductivity.

[0360] As shown in Figures 32, 33 and 34, this embodiment can also improve the stability of the electrical connection plate 1 by setting a limiting rib 19 on the electrical connection plate 1 to limit the electrical connection plate 1 in the depth direction of the first through groove 213.

[0361] Specifically, two limiting ribs 19 extending along the length of the first through groove 213 can be respectively provided on the two opposite sidewalls of the electrical connection plate 1 (the sidewalls being the sidewalls parallel to the plane containing the length and height directions of the first through groove 213). Two second step structures 18 are respectively provided on the two edges of the upper end face of the pole extension body 215, wherein the two edges are edges close to the first through groove 213 and extending along the length of the first through groove 213. After the electrical connection plate 1 is installed to the opening of the first through groove 213, the two limiting ribs 19 are respectively pressed onto the step surfaces of the two second step structures 18, and the limiting ribs 19 and the second step structures 18 are fixed by welding. In this structure, the third step structure 15 may not be provided on the sidewall of the first through groove 213. When it is provided, there should be a certain gap between the electrical connection plate 1 and the step surface of the third step structure 15.

[0362] As can be seen from Figures 31, 32, and 34, in this embodiment, the upper surface of the electrical connection plate 1 and the upper surface of the electrode extension body 215 are located on the same plane, serving as the electrical connection surface 16. The orthographic projection area of ​​the electrical connection surface 16 on the horizontal plane is larger than the orthographic projection area of ​​the remaining parts of the electrode extension body 215 on the horizontal plane, ensuring that this type of polarity terminal has a larger electrical connection area, facilitating connection with external electrical connectors. The external electrical connector can be an electrical connector that enables electrical connection between individual battery cells 2, or an electrical connector that enables electrical connection between battery modules.

[0363] The electrical connection plate 1 can be made of metal materials with good electrical and thermal conductivity, such as silver, copper, and aluminum. However, considering the cost and the electrical and thermal conductivity, aluminum is generally chosen as the material for the electrical connection plate 1.

[0364] Example 19

[0365] This embodiment describes a single-cell battery 2 having the terminal extension member 212 described in the above embodiments. For ease of description, in this embodiment, the single-cell battery 2 with the terminal extension member 212 is defined as a single-cell battery component 5, the structure of which is shown in Figure 35. Figure 35 mainly uses the terminal extension member 212 from Embodiment 18 as an example. It can be seen that a terminal extension member 212 is fixed on each of the two terminals 211 of the single-cell battery 2. The specific fixing method has been described in detail in the above embodiments and will not be repeated here.

[0366] Example 20

[0367] This embodiment is a battery module with the single-cell battery components of Embodiment 19. Its structure is shown in Figure 36. It includes a heat exchanger 3 and 13 single-cell battery components 5 arranged in the same direction. In other embodiments, the number of single-cell battery components 5 can be adjusted according to actual needs.

[0368] In this embodiment, the heat exchanger 3 is U-shaped and includes a first tube, a second tube, and a connecting tube. The first tube is fixed in the first through groove 213 of the polar terminal of each individual battery component 5 on one side of the battery module. The second tube is fixed in the first through groove 213 of the polar terminal of each individual battery component 5 on the other side of the battery module. The two ends of the connecting tube are respectively connected to the ports of the first tube and the second tube on the same side.

[0369] The heat generated by the battery terminal 211 is first conducted to the terminal extension 212, which is in close contact with it. Because the terminal extension 212 is in close contact with the terminal 211, heat can be transferred relatively efficiently from the terminal 211 to the terminal extension 212. After the heat is conducted to the terminal extension 212, it is further transferred to the heat exchanger 3. The heat rapidly diffuses in the heat exchanger 3 and is dissipated through heat exchange between the heat exchanger 3 and the surrounding environment, thereby achieving heat dissipation for the battery module.

Claims

1. An electrical connection board, characterized in that: It includes an electrical connection part, on which a first welding part is provided. The first welding part is used to form a joint opposite to a second welding part on the battery polarity terminal, and the joint is welded together.

2. The electrical connection board according to claim 1, characterized in that: The electrical connection portion includes a plate body; there are two first welding portions; the two first welding portions are respectively arranged on both sides of the plate body in the width direction and extend along the length direction of the plate body.

3. The electrical connection board according to claim 2, characterized in that: The first welded part is the edge of the top surface of the plate body in the width direction.

4. The electrical connection board according to claim 3, characterized in that: The edge where the edge intersects with the outer wall of the main body of the plate is provided with a first inclined surface; The first bevel is used to mate with the second bevel on the second welding part of the polarity terminal, and the two together form a welding area with a V-shaped cross-section.

5. The electrical connection board according to claim 2, characterized in that: The electrical connection portion also includes two folded edges; Two folded edges are respectively set on both sides of the width direction of the main body of the board, both extending along the length direction of the main body of the board, and folded away from the main body of the board; The top surfaces of the two folded edges serve as the two first welding parts.

6. The electrical connection board according to claim 5, characterized in that: The edge where the top surface of the folded edge intersects the outer wall of the folded edge is provided with a third inclined surface; The third inclined surface is used to cooperate with the second inclined surface on the second welding part of the polarity terminal, and the two form a welding area with a V-shaped cross-section.

7. The electrical connection plate according to any one of claims 1 to 6, characterized in that: It also includes a clamping part; the clamping part is used to press against the outer surface of the heat exchanger fixed on the battery polarity terminal.

8. The electrical connection plate according to claim 7, characterized in that: The pressing part is a second through groove opened on the plate body along the length direction of the plate body. The inner surface of the second through groove is used to press against the outer surface of the heat exchange component fixed on the battery polarity terminal. The second through groove is located between the two first welding parts.

9. A battery assembly, characterized in that: Includes a battery and an electrical connection plate as described in any one of claims 1 to 8; The battery includes a casing and m electrode assemblies, where m is an integer greater than 1; The m electrode assemblies are arranged in the housing along the first direction. The top plate of the housing is provided with 2n polarity terminals corresponding to the electrode tabs of the electrode assemblies. The electrode tabs of each electrode assembly are connected to the corresponding polarity terminals. Each polarity terminal is provided with a second welding part. Two electrical connection plates are parallel to each other and both extend along a first direction; the first welding part of one electrical connection plate is arranged opposite to the second welding part on n positive terminals to form a joint, and the two plates are welded together at the joint; the first welding part of the other electrical connection plate is arranged opposite to the second welding part on n negative terminals to form a joint, and the two plates are welded together at the joint; thus realizing the parallel connection between m electrode assemblies.

10. The battery assembly according to claim 9, characterized in that: The battery also includes heat exchange components fixed on each polarity terminal; The clamping part on the electrical connection plate is pressed into contact with the outer surface of the heat exchanger.

11. A battery assembly, characterized in that: Includes a high-capacity battery and the electrical connection plates described in claims 1; The high-capacity battery includes n individual cells arranged along a first direction; the internal cavities of the n individual cells are interconnected, and the electrolyte and / or gas between the individual cells are shared; where n is an integer greater than 1; each individual cell has a second welding part on its polarity terminal; The electrical connection plate includes an electrical connection portion, and the electrical connection portion is provided with a first welding portion; Two electrical connection plates are parallel to each other and both extend along a first direction; the first welding part of one electrical connection plate is arranged opposite to the second welding part on all the positive terminals of the n individual cells to form a joint, and the two electrical connection plates are welded together at the joint; the first welding part of the other electrical connection plate is arranged opposite to the second welding part on all the negative terminals of the n individual cells to form a joint, and the two electrical connection plates are welded together at the joint. To achieve parallel connection between n individual battery cells.

12. The battery assembly according to claim 11, characterized in that: Each individual battery cell has a first through groove extending in a first direction on its polar terminal; the top end faces of the two side walls of the first through groove serve as two second welding parts. The electrical connection portion includes a plate body; there are two first welding portions; the two first welding portions are respectively disposed on both sides of the plate body in the width direction and extend along the length direction of the plate body; One of the electrical connection plates is embedded in the first through slots on all the positive terminals on one side of the n individual cells. The two first welding parts in the electrical connection plate are respectively arranged opposite to the second welding parts on the same side of the positive terminals of the n individual cells to form a joint, and are welded together at the joint. Another electrical connection plate is embedded in the first through slot on all the negative terminals on one side of the n individual cells. The two first welding parts in the electrical connection plate are respectively arranged opposite to the second welding parts on the same side of the negative terminals of the n individual cells to form a joint, and are welded together at the joint.

13. The battery assembly according to claim 12, characterized in that: The first welded part is the edge of the top surface of the plate body in the width direction.

14. The battery assembly according to claim 13, characterized in that: The edge where the edge intersects with the outer wall of the main body of the plate is provided with a first inclined surface; The edge where the second welding part of the polar terminal intersects with the large surface of the side wall of the first through groove is provided with a second inclined surface; The first inclined surface and the second inclined surface cooperate to form a welding area with a V-shaped cross-section.

15. The battery assembly according to claim 12, characterized in that: The electrical connection portion also includes two folded edges; Two folded edges are respectively set on both sides of the width direction of the main body of the board, both extending along the length direction of the main body of the board, and folded away from the main body of the board; The top surfaces of the two folded edges serve as the two first welding parts.

16. The battery assembly according to claim 15, characterized in that: The edge where the top surface of the folded edge intersects the outer wall of the folded edge is provided with a third inclined surface; The edge where the top end face of the first through slot sidewall of the polar terminal intersects with the large surface of the first through slot sidewall is provided with a second inclined surface; The third inclined surface cooperates with the second inclined surface, and the two together form a welding area with a V-shaped cross-section.

17. The battery assembly according to any one of claims 12 to 16, characterized in that: The high-capacity battery also includes a heat exchanger embedded in the first through slot on each polarity terminal; The electrical connection plate also includes a clamping part; the clamping part is pressed into contact with the outer surface of the heat exchanger.

18. The battery assembly according to claim 17, characterized in that: The pressing part is a second through groove opened on the plate body along the length direction of the plate body, and the second through groove is located between the two first welding parts; The inner surface of the second through groove is pressed into contact with the outer surface of the heat exchanger.

19. The battery assembly according to claim 17, characterized in that: The high-capacity battery also includes a casing; multiple individual cells are arranged inside the casing; the top plate of the casing has clearance holes corresponding to the polarity terminals of each individual cell; the polarity terminals of each individual cell extend out of the corresponding clearance holes, and the area corresponding to each clearance hole on the top plate of the casing is sealed to the top cover plate of the corresponding individual cell.

20. A battery assembly, characterized in that: Includes a battery module and multiple electrical connection boards as described in claim 1; The battery module includes n individual cells arranged along a first direction; where n is an integer greater than 1; each individual cell has a second welding part on its polarity terminal; The electrical connection plate includes an electrical connection portion, and the electrical connection portion is provided with a first welding portion; The first welded part at both ends of each electrical connection plate is respectively arranged opposite to the second welded part of the different polarity terminal of the adjacent single cell to form a joint. The joint is welded and connected to realize the series connection between n single cells.

21. The battery assembly according to claim 20, characterized in that: Each individual battery cell has a first through groove extending in a first direction on its polar terminal, and the top end faces of the two side walls of the first through groove serve as two second welding parts. The electrical connection portion includes a plate body; there are two first welding portions; the two first welding portions are respectively disposed on both sides of the plate body in the width direction and extend along the length direction of the plate body; Each plate body has a first through groove embedded at both ends of the adjacent single cell terminals of different polarities. Each first welding part and the corresponding second welding part are arranged opposite to each other to form a joint, and are welded together at the joint.

22. The battery assembly according to claim 21, characterized in that: The first welded part is the edge of the top surface of the plate body in the width direction.

23. The battery assembly according to claim 22, characterized in that: The edge where the edge intersects with the outer wall of the main body of the plate is provided with a first inclined surface; The edge where the top end face of the first through slot sidewall of the polar terminal intersects with the large surface of the first through slot sidewall is provided with a second inclined surface; The first inclined surface and the second inclined surface cooperate to form a welding area with a V-shaped cross-section.

24. The battery assembly according to claim 21, characterized in that: The electrical connection portion also includes two folded edges; Two folded edges are respectively set on both sides of the width direction of the main body of the board, both extending along the length direction of the main body of the board, and folded away from the main body of the board; The top surfaces of the two folded edges serve as the two first welding parts.

25. The battery assembly according to claim 24, characterized in that: The edge where the top surface of the folded edge intersects the outer wall of the folded edge is provided with a third inclined surface; The edge where the top end face of the first through slot sidewall of the polar terminal intersects with the large surface of the first through slot sidewall is provided with a second inclined surface; The third inclined surface cooperates with the second inclined surface, and the two together form a welding area with a V-shaped cross-section.

26. The battery assembly according to any one of claims 21 to 25, characterized in that: The battery module also includes heat exchange components embedded in the first through slots on each polarity terminal; The electrical connection plate also includes a clamping part; the clamping part is pressed into contact with the outer surface of the heat exchanger.

27. The battery assembly according to claim 26, characterized in that: The pressing part is a second through groove opened on the plate body along the length direction of the plate body, and the second through groove is located between the two first welding parts; The inner surface of the second through groove is pressed into contact with the outer surface of the heat exchanger.

28. The battery assembly according to claim 20, characterized in that: The battery module also includes a housing; the housing is provided with an explosion vent; n individual batteries are arranged in the housing along a first direction; the top plate of the housing is provided with clearance holes corresponding to the polarity terminals of each individual battery; the polarity terminals of each individual battery extend out of the corresponding clearance holes, and the area corresponding to each clearance hole on the top plate of the housing is sealed and connected to the top cover plate of the corresponding individual battery. The outer shell is provided with an explosion vent channel that communicates with the explosion vent, through which thermal runaway flue gas is discharged in an orderly manner from the explosion vent.

29. The battery assembly according to claim 20, characterized in that: The battery module also includes an explosion venting channel; the explosion venting channel extends along a first direction and seals over the explosion venting ports of n individual batteries.

30. A pole post extension member, characterized in that: It includes a main body of the electrode extension component; a first through groove is formed on the main body of the electrode extension component for installing a heat exchange component, and the bottom of the first through groove is used to fix and connect with the electrode of the single cell.

31. The pole extension member according to claim 30, characterized in that: The inner surface of the first channel is curved, which is used to fit tightly with the tube wall of the heat exchange component; the bottom of the first channel is provided with a blind hole, the bottom of which is flat, for connecting to the single cell electrode by welding.

32. The pole extension member according to claim 31, characterized in that: It also includes heat-conducting columns; the heat-conducting columns are used to fix inside the blind hole and fit tightly with the inner wall of the blind hole, and the surface away from the bottom of the blind hole is arc-shaped to fit tightly with the tube wall of the heat exchanger.

33. The pole extension member according to claim 32, characterized in that: It also includes an adhesive layer; the adhesive layer is disposed on the arc surface of the heat-conducting pillar and the arc surface of the first through groove.

34. The pole extension member according to any one of claims 30 to 33, characterized in that: It also includes an electrical connection plate; the electrical connection plate is used to press the heat exchanger onto the main body of the pole extension.

35. The pole extension member according to claim 34, characterized in that: In the depth direction of the first through groove, the size of the first through groove is larger than the size of the heat exchanger; in the width direction of the through groove, the opening size of the first through groove is larger than the size of the rest of the first through groove. The electrical connection plate is fixed in the first through groove and located at the opening; a second through groove is opened on the electrical connection plate; the inner surface shape of the second through groove is adapted to the shape of the heat exchanger tube wall, so as to fit tightly with the heat exchanger tube wall.

36. The pole extension member according to claim 35, characterized in that: The side wall of the first through groove is provided with a third step structure. The step surface is used to cooperate with the electrical connection plate and limit the electrical connection plate in the depth direction of the first through groove.

37. The pole extension member according to claim 36, characterized in that: The upper surface of the electrical connection plate and the upper surface of the pole extension body are located on the same plane, serving as the electrical connection surface; The projected area of ​​the electrical connection surface on the horizontal plane is larger than the projected area of ​​the rest of the pole extension body on the horizontal plane.

38. A single-cell battery component, comprising a single-cell battery, characterized in that: It also includes the terminal extension member as described in any one of claims 30 to 37; the terminal extension member is fixed on the terminal of the single battery cell.

39. A battery assembly, characterized in that: It includes a heat exchange component and n individual battery components arranged in the same direction; wherein the individual battery components are the individual battery components as described in claim 38, and n is an integer greater than 1; The heat exchanger is installed into the first through slot of each individual battery cell component.

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