A high capacity battery assembly

Abstract

This invention belongs to the field of batteries, specifically a high-capacity battery assembly. It overcomes the problems of poor connection stability and low conductivity in existing electrical connections. The assembly includes a high-capacity battery and two electrical connection plates. The high-capacity battery comprises multiple interconnected individual cells. Each individual cell has a second welding portion on its polarity terminal. The electrical connection plates have a first welding portion. The first welding portion of one electrical connection plate is aligned with the second welding portions on all positive terminals of each individual cell to form a seam, and the connection is welded at the seam. Similarly, the first welding portion of the other electrical connection plate is aligned with the second welding portions on all negative terminals of each individual cell to form a seam, and the connection is welded at the seam. This butt-welding method fundamentally eliminates connection gaps, reduces contact resistance, and significantly improves conductivity. Simultaneously, the continuous weld structure effectively disperses stress, avoids stress concentration, and enhances connection reliability.

Description

Technical Field

[0001] This invention belongs to the field of batteries, specifically a high-capacity battery module. Background Technology

[0002] In the construction of battery modules, achieving stable and efficient electrical connections between cells 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 at the connection point. 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 purpose of this invention is to provide a high-capacity battery assembly that overcomes the problems of poor connection stability and low conductivity in existing electrical connections.

[0006] The present invention relates to a high-capacity battery assembly, comprising a high-capacity battery and two electrical connection plates;

[0007] 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;

[0008] The aforementioned electrical connection plate includes an electrical connection portion, and the electrical connection portion is provided with a first welding portion;

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Furthermore, a first through groove extending in a first direction is formed on the polar terminal of each individual cell; the top end faces of the two side walls of the first through groove serve as two second welding parts respectively.

[0013] 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;

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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;

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] The third inclined surface and the second inclined surface are combined to form a welding area with a V-shaped cross-section.

[0026] 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.

[0027] 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.

[0028] 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;

[0029] The inner surface of the second channel is pressed into contact with the outer surface of the heat exchanger.

[0030] The design of using the second through groove 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.

[0031] 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.

[0032] The beneficial effects of this invention are:

[0033] This invention features a first welding portion on an electrical connection plate and a second welding portion on a polarity terminal. A butt-seam welding method is used to connect the first and second welding portions, 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-seam welding is relatively smooth, reducing resistance loss and improving the conductivity of the electrical connection compared to traditional lap welding.

[0034] 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. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the large-capacity battery module in Example 1;

[0036] Figure 2 This is a cross-sectional view of the high-capacity battery assembly in Example 1;

[0037] Figure 3 This is a schematic diagram of the electrical connection plate in Example 1;

[0038] Figure 4 This is a partial cross-sectional view of a high-capacity battery assembly in other embodiments;

[0039] Figure 5 This is a partial cross-sectional view of the high-capacity battery assembly in Example 1;

[0040] Figure 6 This is a schematic diagram of the electrical connection plate in Example 2;

[0041] Figure 7 This is a schematic diagram of the structure of the large-capacity battery module in Example 2;

[0042] Figure 8 This is a cross-sectional view of the high-capacity battery assembly in Example 2;

[0043] Figure 9 This is a partial cross-sectional view of a high-capacity battery assembly in other embodiments;

[0044] Figure 10 This is a partial cross-sectional view of the high-capacity battery assembly in Example 2;

[0045] Figure 11 This is a schematic diagram of the structure of the large-capacity battery module in Example 3;

[0046] Figure 12 This is a partial cross-sectional view of the high-capacity battery assembly in Example 3;

[0047] Figure 13 This is a schematic diagram of the structure of an electrical connection plate in Example 4;

[0048] Figure 14 This is a partial cross-sectional view of a high-capacity battery assembly in Example 4;

[0049] Figure 15 This is a schematic diagram of another electrical connection plate in Example 4;

[0050] Figure 16 This is a cross-sectional view of another electrical connection plate in Example 4;

[0051] Figure 17 This is a schematic diagram of another high-capacity battery assembly in Example 4;

[0052] Figure 18 This is a partial cross-sectional view of another high-capacity battery assembly in Example 4.

[0053] The attached figures are labeled as follows:

[0054] 1. Electrical connection plate; 11. Plate body; 12. First welding part; 121. First inclined surface; 13. Folded edge; 131. Third inclined surface; 14. Second through groove; 2. Single cell; 21. Polar terminal; 211. Terminal post; 212. Terminal post extension; 213. First through groove; 214. Second inclined surface; 3. Heat exchanger; 4. Outer shell; 41. Electrolyte sharing chamber; 42. Gas sharing chamber; 43. Clearance hole. Detailed Implementation

[0055] 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.

[0056] 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.

[0057] 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," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] This invention discloses a high-capacity battery assembly, including a high-capacity battery and two electrical connection plates. 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 parallel connection between the individual cells. To improve welding reliability and electrical connection stability, this invention adopts a butt-welding process. Specifically, a first welding part is provided on the electrical connection plate, and a second welding part is provided on the polarity terminal. The first welding part and the second welding part are arranged opposite to each other, forming a joint before welding.

[0059] 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. In terms of space utilization, screw connections require pre-reserved space for mounting holes and nuts, while butt welding requires no additional space, allowing for a more compact structure for large-capacity batteries. Regarding installation efficiency, butt welding can be achieved quickly in batches using automated equipment, while screw connections require individual screwing, which is time-consuming and labor-intensive, hindering large-scale production.

[0060] 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.

[0061] It should be noted that:

[0062] 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.

[0063] 2. 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.

[0064] 3. The aforementioned high-capacity batteries can include at least the following two types:

[0065] Type 1 high-capacity batteries:

[0066] 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.

[0067] 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.

[0068] Type II high-capacity batteries:

[0069] 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.

[0070] The outer casing is equipped with an explosion vent, through which thermal runaway fumes are discharged.

[0071] This invention does not specifically limit the above-mentioned shell structure, but at least the following two structures can be adopted:

[0072] 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).

[0073] 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).

[0074] 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.

[0075] 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.

[0076] The internal cavities of individual cells can usually be connected through a shared chamber located within the casing.

[0077] It should be noted that:

[0078] 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.

[0079] 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.

[0080] 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.

[0081] It should also be noted that the gas port here has the following two meanings:

[0082] 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;

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 4. Based on the above two types of large-capacity batteries, the present invention can also set a heat exchange component on the polarity terminal to realize heat exchange of the large-capacity battery based on the heat exchange component; corresponding to this type of large-capacity battery, a functional structure can also be set on the electrical connection plate to cooperate with the heat exchange component fixed on the polarity terminal. Based on the functional structure, a downward pressure is applied to the heat exchange component to ensure that the heat exchange component is in full contact with the polarity terminal, thereby significantly improving the heat exchange effect of the heat exchange component.

[0088] 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.

[0089] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0090] Example 1

[0091] like Figure 1 and Figure 2 The diagram shows a schematic and cross-sectional view of the large-capacity battery assembly in this embodiment, including a large-capacity battery and multiple electrical connection plates 1. The large-capacity battery is the first type of large-capacity battery described above. It should be noted that the related shared piping is not shown in the diagram.

[0092] 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.

[0093] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0094] 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.

[0095] 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 as follows: Figure 3 As shown, the electrical connection plate 1 (electrical connection part) includes a plate body 11, which is a long strip plate 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.

[0096] 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.

[0097] 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.

[0098] Specifically, in combination Figure 2 As can be seen, in this embodiment, a first through slot 213 is opened in the polarity terminal 21. During assembly, an electrical connection plate 1 is embedded in the first through slot 213 of the positive polarity terminals 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 slot 213 of all positive polarity terminals (the top end face of the side wall of the first through slot 213 is the top end face of the polarity terminal). At the joint, a butt welding process is used for welding. Figure 2 (Area shown in section a). Another electrical connection plate 1 is embedded in the first through slot 213 of the negative polarity terminals 21 of all individual cells 2 (for ease of display of the first through slot 213, Figure 2 The electrical connection plate 1 is not shown inside the polarity terminal 21 on one side. The two first welding parts on the electrical connection plate are 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.

[0099] It should be noted that the term "aligned connection" mentioned above has the following two meanings:

[0100] 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;

[0101] 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.

[0102] 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.

[0103] In some other embodiments, such as Figure 4As shown, 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 flush with the top surface of the polarity terminal 21, forming a welding connection surface. Figure 4 Welding is performed in the area shown in b. Figure 4 The single-sided welding method used in the previous embodiment resulted in a weaker connection between the electrical connection plate and the polarity terminal compared to the previous embodiment.

[0104] like Figure 5 As shown, this embodiment can also make the following improvements to the above-mentioned welding structure to further optimize the welding effect:

[0105] 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. Figure 5 The area shown in c is the V-shaped region. During the welding operation, the solder can fully fill this V-shaped welding 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 electrical connection of the large-capacity battery module.

[0106] 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.

[0107] Example 2

[0108] Unlike the large-capacity battery pack in Embodiment 1, this embodiment uses an electrical connection board 1 with a different structure to achieve parallel connection between individual battery cells 2.

[0109] The structure of electrical connection plate 1 is as follows Figure 6 As shown, 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. 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, and both folded edges 13 are folded away from the plate body 11.

[0110] 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.

[0111] like Figure 7 and Figure 8 The figures shown are a schematic diagram and a cross-sectional view of the large-capacity battery in this embodiment. 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. Figure 8 The area shown in d is used for seam welding. A tight connection between the electrical connection plate 1 and the polarity terminal 21 can be achieved.

[0112] Compared to the electrical connection plate 1 in Embodiment 1, 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.

[0113] In some other embodiments, such as Figure 9 As shown, the electrical connection plate 1 can 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 on only 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. Figure 8 The area shown in e is as follows. 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 position of the plate body 11.

[0114] like Figure 10 As shown, this embodiment can further optimize the above welding structure by processing 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, see... Figure 10The area shown in f is the V-shaped region. During the welding operation, the solder can fully fill this V-shaped welding 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 electrical connection of the large-capacity battery module.

[0115] 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.

[0116] Example 3

[0117] like Figure 11 and Figure 12 As shown, this is a high-capacity battery module in this embodiment. Its structure differs from the high-capacity battery module in the above embodiments in that the high-capacity battery is the second type of high-capacity battery mentioned above.

[0118] In this embodiment, the second type of high-capacity battery arranges 12 individual battery cells 2 in the inner cavity of the outer casing 4. Each terminal extension 212 passes through the clearance hole 43 and connects to the corresponding terminal 211. The part 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 with the same polarity on the same side. 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 the same as those in the above embodiment, and will not be described again here. Figure 11 and Figure 12 Taking the electrical connection plate 1 structure in Embodiment 2 as an example.

[0119] 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.

[0120] 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.

[0121] Example 4

[0122] Unlike the above embodiments, this embodiment of the large-capacity battery adds a heat exchange component 3 based on any of the above embodiments. Correspondingly, the electrical connection plate 1 is provided with a pressing part based on 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, ensuring 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.

[0123] like Figure 13 As shown, 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.

[0124] like Figure 14 As shown, this is for adaptation to Figure 13 The large-capacity battery assembly shown in the diagram (taking a heat exchanger 3 as an example based on the large-capacity battery assembly of Embodiment 1) has the heat exchanger 3 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 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 large-capacity battery assembly during operation.

[0125] like Figure 15 and Figure 16 As shown, 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.

[0126] like Figure 17 and Figure 18 To adapt to Figure 15The large-capacity battery assembly shown in the diagram (taking a heat exchanger 3 as an example based on the large-capacity battery assembly of Embodiment 2) has the heat exchanger 3 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 first through slot 213 of the polarity terminal 21, ensuring the heat dissipation performance and stability of the large-capacity battery assembly during operation.

[0127] from Figures 13 to 18 As can be seen from the image, in this embodiment, the heat exchanger 3 uses 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.

[0128] 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.

Claims

1. A high-capacity battery module, characterized in that: Includes a high-capacity battery and two electrical connection boards; 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.

2. The high-capacity battery module according to claim 1, 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.

3. The high-capacity battery module 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 high-capacity battery module 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 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.

5. The high-capacity battery module 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 high-capacity battery module 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 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.

7. The high-capacity battery module according to any one of claims 2 to 6, 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.

8. The high-capacity battery module 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, 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.

9. The high-capacity battery module according to claim 7, 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.

Images