An electrical connection plate and a battery member

Abstract

This invention belongs to the field of batteries, specifically an electrical connection plate and a battery component, overcoming the problems of poor connection stability and low conductivity in existing electrical connections. The electrical connection plate includes an electrical connection portion, on which a first welding portion is provided. The first welding portion is arranged opposite to a second welding portion on the battery polarity terminal to form a seam, and the connection is welded at the seam. The battery component includes a battery and two electrical connection plates; the first welding portion of one electrical connection plate is arranged opposite to the second welding portions on n positive polarity terminals of the battery to form a seam, and the connection is welded at the seam; the first welding portion of the other electrical connection plate is arranged opposite to the second welding portions on n negative polarity terminals to form a seam, and the connection is welded at the seam. Based on the seam welding, the connection gap is fundamentally eliminated, the contact resistance is reduced, and the conductivity is significantly improved.

Description

Technical Field

[0001] This invention belongs to the field of batteries, specifically an electrical connection plate and a battery component. 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 purpose of this invention is to provide an electrical connection board and battery component that overcomes the problems of poor connection stability and low conductivity in existing electrical connections.

[0006] The first aspect of the present invention provides an electrical connection plate, including an electrical connection portion, wherein the electrical connection portion is provided with a first welding portion, the first welding portion being configured to form a joint opposite to a second welding portion on a battery polarity terminal, and the joint being 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 battery component, including a battery and two electrical connection plates as described above;

[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] The beneficial effects of this invention are:

[0029] 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. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the electrical connection plate in Example 1;

[0031] Figure 2 This is a schematic diagram of the battery component in Example 1;

[0032] Figure 3 This is a cross-sectional view of the battery component in Example 1;

[0033] Figure 4 This is a partial cross-sectional view of the battery component in another embodiment;

[0034] Figure 5 This is a partial cross-sectional view of the battery component in Example 1;

[0035] Figure 6 This is a schematic diagram of the electrical connection plate in Example 2;

[0036] Figure 7 This is a schematic diagram of the battery component in Example 2;

[0037] Figure 8 This is a cross-sectional view of the battery component in Example 2;

[0038] Figure 9 This is a partial cross-sectional view of the battery component in another embodiment;

[0039] Figure 10 This is a partial cross-sectional view of the battery component in Example 2;

[0040] Figure 11 This is a schematic diagram of the structure of an electrical connection plate in Example 3;

[0041] Figure 12 This is a schematic diagram of the structure of a battery component in Example 3;

[0042] Figure 13This is a partial cross-sectional view of a battery component in Example 3;

[0043] Figure 14 This is a schematic diagram of another electrical connection plate in Example 3;

[0044] Figure 15 This is a cross-sectional view of another electrical connection plate in Embodiment 3;

[0045] Figure 16 This is a schematic diagram of another battery component in Example 3;

[0046] Figure 17 This is a partial cross-sectional view of another battery component in Example 3;

[0047] Figure 18 This is a schematic diagram of the battery component in Example 4.

[0048] The attached figures are labeled as follows:

[0049] 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. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] This invention discloses an electrical connection plate, which can be welded to different battery polarity terminals in a battery component 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 part, which is positioned opposite to a second welding part on the battery polarity terminal, forming a joint before welding.

[0054] 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 component structure.

[0055] 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.

[0056] It should be noted that:

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0063] Example 1

[0064] 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 1 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.

[0065] 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.

[0066] 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.

[0067] like Figure 2 and Figure 3 The figures shown are a schematic diagram and a cross-sectional view of the battery component in this embodiment, including 13 individual battery cells 2 arranged along the x-direction and the aforementioned electrical connection plate 1.

[0068] 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.

[0069] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0070] Figure 2 Taking the series connection between individual cells 2 using an electrical connection plate 1 as an example, the battery component includes multiple electrical connection plates 1. Each electrical connection plate 1 is welded to the polarity terminals 21 of different polarities of adjacent individual cells 2 to realize the series connection between the individual cells 2.

[0071] Specifically, in combination Figure 3 As can be seen, in this embodiment, a first through slot 213 is formed in the polarity terminal 21. During assembly, both ends of each electrical connection plate 1 are respectively embedded in the first through slot 213 of the polarity terminal 21 of the adjacent single cell 2 with different polarities (for ease of display of the first through slot 213, ...). Figure 3 The electrical connection plate 1 is not shown inside the polarity terminal 21 on one side. 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, a butt weld is used for welding. Figure 3 (Region a is shown in the middle).

[0072] It should be noted that the term "aligned connection" mentioned above has the following two meanings:

[0073] 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;

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In some other embodiments, such as Figure 4 As 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 4The 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.

[0078] 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:

[0079] 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 battery components.

[0080] 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.

[0081] Example 2

[0082] 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 an electrical connection part, and its structure is as follows: Figure 6 As shown, 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 disposed 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.

[0083] 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.

[0084] like Figure 7and Figure 8 The figures shown are a schematic diagram and a cross-sectional view of the battery component in this embodiment, including 12 individual battery cells 2 arranged along the x-direction and the aforementioned electrical connection plate 1.

[0085] 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.

[0086] Each individual cell 2 has a terminal extension 212 connected to its terminal post 211 as a polarity terminal 21.

[0087] Figure 7 Taking the parallel connection between individual cells 2 using an electrical connection plate 1 as an example, it includes two electrical connection plates 1, which are respectively welded to all positive terminals 21 and all negative terminals 21 to realize the parallel connection between each individual cell 2.

[0088] Specifically, in combination 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. See 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.

[0089] 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.

[0090] 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 structure 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 9 The area shown in Figure e. Simultaneously, a stepped structure is provided at the corresponding position of the polarity terminal 21, with the horizontal surface of the step tightly fitting against the bottom surface of the folded edge 13, thus limiting the position of the main body 11. Compared to this embodiment, the connection strength between the electrical connection plate and the polarity terminal is weaker.

[0091] like Figure 10As 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 10 The area shown in f is a V-shaped region. During welding, 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 battery components.

[0092] 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.

[0093] Example 3

[0094] 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 component. The electrical connection plate 1 in this embodiment can not only realize the electrical connection between each individual battery 2 in the battery component, 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.

[0095] like Figure 11 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.

[0096] like Figure 12 and Figure 13 To adapt to Figure 11The battery component with the electrical connection plate 1 shown has a 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 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 component during operation.

[0097] like Figure 14 and Figure 15 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.

[0098] like Figure 16 and Figure 17 To adapt to Figure 14 The battery component with the electrical connection plate 1 shown has a 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 through slot of the polarity terminal 21, ensuring the heat dissipation performance and stability of the large-capacity battery component during operation.

[0099] from Figures 11 to 17 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.

[0100] 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.

[0101] Example 4

[0102] like Figure 18 As shown, this embodiment discloses a battery component. Unlike the battery components in the above embodiments, the battery component in this embodiment includes a battery and two electrical connection plates as in any of the above embodiments. Figure 18 Taking an electrical connection board from Embodiment 3 as an example.

[0103] 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.

[0104] 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.

[0105] In this embodiment, the top plate of the outer casing is provided with 2n polarity terminals, where n equals 12. Twelve of these terminals serve as the positive polarity terminals of the battery component, and the other twelve serve as the negative polarity terminals of the battery component.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

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 plate 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 component, 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 component 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.

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