Battery connecting piece, battery module and energy storage equipment

Abstract

The utility model discloses a battery connecting piece, a battery module and energy storage equipment, the battery connecting piece is used for connecting poles of two adjacent batteries, the battery connecting piece comprises at least two welding parts and a connecting part, the two welding parts are arranged at an interval along a first direction, each welding part is provided with a first surface and a second surface deviating from the first surface, the first surface is provided with a first groove, the first groove is configured to accommodate at least part of the pole, the second surface is provided with a second groove corresponding to the first groove, the second groove is configured to be a welding area welded with the pole, and the connecting part is connected between two adjacent welding parts. According to the technical scheme, alignment connection and full welding between the battery connecting piece and the pole can be better achieved, the situation that deviation occurs in the welding area is effectively avoided, the overcurrent capacity of the welding area can be improved, the situation that contact of the welding area is poor or contact resistance is increased is avoided, and the service life of the battery is prolonged. Therefore, risks of safety problems such as overcharge and thermal runaway can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery connector, a battery module, and an energy storage device. Background Technology

[0002] Energy storage technologies are mainly divided into mechanical energy storage, electromagnetic energy storage, and electrochemical energy storage. Among them, electrochemical energy storage is gradually gaining market share due to its advantages such as no geographical limitations, short construction cycle, flexible application, fast response speed, mature technology, high energy density, and high conversion efficiency. Electrochemical energy storage mainly relies on battery modules to collect and release energy. A battery module consists of multiple batteries connected in series or parallel, which are welded together through terminals and battery connectors. In related technologies, grooves are pre-drilled on the terminals, and corresponding through holes are pre-drilled on the battery connectors to achieve alignment and connection. However, due to the pre-drilled grooves and through holes, full welding cannot be achieved between the terminals and battery connectors, limiting the current carrying capacity of the welded area and potentially leading to poor contact or increased contact resistance, thereby increasing the risk of safety problems such as overcharging and thermal runaway. Utility Model Content

[0003] This application discloses a battery connector, a battery module, and an energy storage device. The battery connector can better achieve full welding between the battery connector and the terminal post, and can help reduce the risk of safety problems such as overcharging and thermal runaway.

[0004] To achieve the above objectives, in a first aspect, embodiments of this application disclose a battery connector for connecting the terminals of two adjacent batteries, the battery connector comprising:

[0005] At least two welding portions are spaced apart along a first direction. Each welding portion has a first surface and a second surface opposite to the first surface. The first surface has a first groove configured to accommodate at least a portion of the electrode post. The second surface has a second groove corresponding to the first groove, configured as a welding area for welding with the electrode post.

[0006] A connecting portion, which connects two adjacent welded portions.

[0007] The battery connector provided in this embodiment accommodates at least a portion of the terminal post through a first groove, which better facilitates the alignment and connection between the battery connector and the terminal post. Furthermore, it eliminates the need for pre-drilled through holes in the battery connector and pre-drilled grooves in the terminal post, enabling full welding between the battery connector and the terminal post. Compared to a flat connection between the battery connector and the terminal post, the connection method where at least a portion of the terminal post extends into the first groove increases the current-carrying area between the battery connector and the terminal post from a flat surface to a groove-shaped contact surface, which is beneficial for increasing the current-carrying capacity of the welding area. In addition, when misalignment occurs between the battery connector and the terminal post, it can be identified by the first groove not fitting properly with the terminal post, allowing for timely adjustment of the position between the battery connector and the terminal post, thereby avoiding poor welding due to misalignment. Since the welding of battery connectors and terminals is usually done using laser welding, the thickness of the battery connector in the welding area directly affects the welding difficulty and the power required for laser welding. Based on this, the thickness of the welding area is effectively reduced by the first and second grooves, which helps to reduce the cost and difficulty of welding. In addition, the second groove can also provide position guidance for the welding of the terminal, making it easier for the laser to accurately identify the welding point. This can effectively avoid deviations in the welding area, which helps to avoid poor contact or increased contact resistance in the welding area, and also helps to increase the current carrying capacity of the welding area, thereby helping to reduce the risk of safety problems such as overcharging and thermal runaway.

[0008] As an optional implementation, the projection of the first groove onto the second surface coincides with the second groove. This avoids misalignment between the first and second grooves, which could cause a shift in the connection position between the terminal and the battery connector. This improves the welding precision between the battery connector and the terminal, facilitates full welding between them, increases the current-carrying capacity of the welded area, and reduces the risk of overcharging and thermal runaway.

[0009] As an optional implementation, a chamfer is provided at the junction of the sidewall and bottom surface of the first groove; and / or,

[0010] A chamfer is provided at the connection between the side wall surface and the bottom surface of the second groove.

[0011] By setting chamfers at the connection points of the sidewalls and bottom surfaces of the first and second grooves, respectively, demolding of the first and second grooves can be facilitated. This simplifies the manufacturing process of the battery connectors, improves production efficiency, and streamlines the manufacturing process. Furthermore, the chamfers on the first groove and the terminal post increase the current-carrying area of ​​the welding zone, thereby increasing its current-carrying capacity and further reducing the risk of overcharging and thermal runaway.

[0012] As an optional implementation, the connecting portion includes a first arched structure and a second arched structure, which are continuously arranged along the first direction. The second arched structure has a convex direction opposite to that of the first arched structure. The first and second arched structures with opposite convex directions provide a buffer for battery expansion, and the space between them provides heat dissipation space for the battery, thus improving the safety performance of the battery module. Furthermore, compared to an implementation with a single-direction convex arched structure, the opposite convex directions of the first and second arched structures disperse the stress on the connecting portion, preventing stress concentration in one direction. This avoids cracks or breakage at the top and edges of the first and second arched structures due to stress concentration, thereby improving the reliability of the battery connector.

[0013] As an optional implementation, the first arch structure includes multiple first arch structures arranged sequentially along the first direction, with a second arch structure between adjacent first arch structures. The multiple first arch structures and multiple second arch structures further disperse the stress on the connection portion, helping to further prevent cracks or breakages at the top and edges of the first and second arch structures, thereby further improving the reliability of the battery connector.

[0014] As an optional implementation, the first arched structure protrudes from the first surface to the second surface, and the second arched structure protrudes in the opposite direction to the first arched structure;

[0015] At least one of the second arched structural portions is configured to be embedded between two adjacent batteries.

[0016] By embedding a second arched structure between two adjacent batteries, the height space of the battery module can be effectively utilized, thereby improving the energy density of the battery module.

[0017] As an optional implementation, the height of the first arched structure protruding from the first surface is 0.1–5 mm; and / or,

[0018] The height of the second arched structure protruding from the second surface is 1.5 to 5 mm.

[0019] By setting the height range of the first and second arched structures, a larger stretch margin can be provided for the electrical connectors, and sufficient buffer margin can be provided for battery expansion. In addition, it can also avoid the situation where the first and second arched structures protrude too high, which would weaken the structural strength of the first and second arched structures, thereby helping to reduce the risk of cracks or fractures in the first and second arched structures.

[0020] As an optional implementation, the radius of curvature of the first arch structure is smaller than that of the second arch structure. This allows the first arch structure to provide greater bending stiffness to the connection, while the second arch structure can disperse stress, thereby reducing local stress in the connection and providing greater tensile allowance. This, in turn, improves the battery connector's resistance to battery expansion loads and increases the overall structural toughness of the battery connector.

[0021] As an optional implementation, the thickness of the welded portion, excluding the location of the first groove, is the same as the thickness of the connecting portion. This results in a small difference in internal resistance throughout the battery connector, leading to consistent current carrying capacity across the connector. This helps reduce temperature differences throughout the connector and mitigates the risk of localized overheating. Furthermore, having the welded portion, excluding the first groove, have the same thickness as the connecting portion also improves the overall performance and reliability of the battery connector.

[0022] Secondly, embodiments of this application also disclose a battery module, comprising:

[0023] Multiple batteries arranged in sequence; and

[0024] As described in the first aspect above, the battery connector includes at least two of the welding portions, with the terminals on two adjacent batteries respectively extending at least partially into the first grooves of the two adjacent welding portions, and the terminals abutting against the bottom surface of the first grooves to make the battery connector electrically connected to the terminals.

[0025] Battery modules equipped with this battery connector can also achieve better alignment and full welding between the battery connector and the terminal post, effectively avoiding deviations in the welding area. This helps increase the current carrying capacity of the welding area and avoids poor contact or increased contact resistance in the welding area, thereby reducing the risk of safety issues such as overcharging and thermal runaway.

[0026] As an optional implementation, the outer surface of the portion of the terminal post located in the first groove has a gap with the inner surface of the first groove. This gap between the terminal post and the first groove facilitates the alignment and connection of the battery connector with the terminal post.

[0027] As an optional implementation, the distance between the two furthest points in the projection of the inner side of the first groove onto the first surface is a first distance, and the distance between the two furthest points in the projection of the pole onto the first surface is a second distance, wherein the first distance is 1mm-2mm larger than the second distance; and / or,

[0028] Along the thickness direction of the battery connector, the depth of the first groove is 1mm to 2mm.

[0029] By setting the first distance to be 1mm to 2mm larger than the second distance, it is possible to ensure that the first groove can accommodate at least part of the terminal post, while avoiding the terminal post from shifting within the first groove due to excessive width, thus preventing welding misalignment. This facilitates better alignment and connection between the battery connector and the terminal post. Furthermore, by setting the depth of the first groove to 1mm to 2mm, it is possible to ensure that the first groove can accommodate at least part of the terminal post, further facilitating alignment and connection between the battery connector and the terminal post. However, it is also possible to avoid the battery connector being too thin at the first groove due to excessive depth, which would result in insufficient mechanical strength and increased welding difficulty. This helps reduce the risk of deformation or breakage of the battery connector and also reduces processing and welding complexity.

[0030] As an optional implementation, the distance between the two furthest points in the projection of the inner side of the second groove onto the second surface is a third distance, and the distance between the two furthest points in the projection of the pole onto the first surface is a second distance, wherein the third distance is 1mm-2mm larger than the second distance; and / or,

[0031] Along the thickness direction of the battery connector, the depth of the second groove is 1mm to 2mm.

[0032] By setting the third distance to be 1mm to 2mm larger than the second distance, it is ensured that the welding area covers the width of the terminal post, which facilitates full welding of the battery connector to the terminal post and increases the current carrying capacity of the welding area, thereby reducing the risk of safety issues such as overcharging and thermal runaway. Furthermore, by setting the depth of the second groove to 1mm to 2mm, it provides positional guidance for the welding of the terminal post, making it easier for the laser to accurately identify the welding point and effectively avoiding deviations in the welding area. It also avoids the situation where the battery connector is too thin at the first groove due to an excessively deep second groove, resulting in insufficient mechanical strength and increased welding difficulty. This helps reduce the risk of deformation or breakage of the battery connector and also reduces the difficulty of processing and welding.

[0033] As an optional implementation, a welding material is provided between the battery connector and the terminal. Through the bonding effect of the welding material after heating, melting, and solidifying between the battery connector and the terminal, misalignment of the battery connector and terminal can be avoided after the connection is made. Furthermore, the welding material can improve the welding effect between the battery connector and the terminal, which is beneficial for increasing the current carrying capacity of the welding area and avoiding poor contact or increased contact resistance in the welding area. This helps to reduce the risk of safety problems such as overcharging and thermal runaway.

[0034] As an optional implementation, the welding portion of the battery connector includes 2N portions, which are sequentially arranged along the first direction. N of the welding portions are used to connect N adjacent batteries in parallel to form a first sub-battery pack, and the other N welding portions are used to connect another N adjacent batteries in parallel to form a second sub-battery pack. The first sub-battery pack and the second sub-battery pack are connected in series. Here, N is a positive integer and N is greater than 1. By connecting the parallel first battery pack and the parallel second battery pack in series, on the one hand, the total capacity of the battery module can be increased, extending the battery module's service life; on the other hand, the voltage stability of the battery module can be improved, making the battery module suitable for applications requiring high voltage output. Furthermore, by connecting N batteries in parallel, the load can be distributed among the N batteries, thereby reducing the pressure on individual batteries and further extending battery life.

[0035] Thirdly, embodiments of this application also disclose an energy storage device, including the battery module as described in the second aspect above.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The battery connector, battery module, and energy storage device provided in this application embodiment have the following advantages: the battery connector accommodates at least a portion of the terminal post through a first groove on a first surface, and a second groove on a second surface corresponding to the first groove is provided for welding equipment to perform welding. This has several advantages. First, by accommodating at least a portion of the terminal post through the first groove, the alignment of the battery connector and the terminal post can be better achieved. Furthermore, if misalignment occurs between the battery connector and the terminal post, it can be identified by the first groove not fitting the terminal post, allowing for timely adjustment of the position between the battery connector and the terminal post, thus avoiding poor welding due to misalignment. Second, it eliminates the need for pre-drilled through holes in the battery connector and pre-drilled grooves in the terminal post, enabling full welding between the battery connector and the terminal post. Simultaneously, compared to a flat connection between the battery connector and the terminal post, the connection method where at least a portion of the terminal post extends into the first groove increases the current-carrying area between the battery connector and the terminal post from a flat surface to a groove-shaped contact surface, which is beneficial for increasing the current-carrying capacity of the welding area. Furthermore, the second groove can effectively prevent deviations in the welding area, which helps to avoid poor contact or increased contact resistance in the welding area, and also helps to increase the current carrying capacity of the welding area, thereby reducing the risk of safety problems such as overcharging and thermal runaway. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the battery connector with a reserved through hole and the terminal post with a reserved groove in the relevant technology;

[0040] Figure 2 This is a schematic diagram of the structure of the battery connector provided in an embodiment of this application from one perspective;

[0041] Figure 3 This is a schematic diagram of the battery connector provided in an embodiment of this application from another perspective;

[0042] Figure 4 This is a cross-sectional view of the battery connector provided in an embodiment of this application;

[0043] Figure 5 This is a cross-sectional view of the battery connector (with chamfers in the first and second grooves) provided in an embodiment of this application;

[0044] Figure 6This is a schematic diagram of the battery connector provided in the embodiments of this application, which includes multiple first arched structures;

[0045] Figure 7 This is a structural schematic diagram of the battery connector provided in the embodiments of this application (showing the protrusion height of the first arched structure and the second arched structure);

[0046] Figure 8 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application;

[0047] Figure 9 This is a schematic diagram of another battery module provided in an embodiment of this application;

[0048] Figure 10 This is a schematic diagram of the energy storage device provided in the embodiments of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 100-Battery connector; 1-Welding part; 11-First surface; 111-First groove; 12-Second surface; 121-Second groove; 2-Connecting part; A-Chamfer; 21-First arch structure; B-Height protruding from the first surface; 22-Second arch structure; C-Height protruding from the second surface; X-First direction; 200-Battery module; 201-Battery; 202-Terminal post; 300-Energy storage device; 301-Energy conversion device; 302-First user load; 303-Second user load; 501-Through hole; 502-Groove. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In this application, the terms "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0053] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0054] Furthermore, the terms "set up," "equipped with," "connected," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0055] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0056] In recent years, to address the challenges of global climate change, approximately 130 countries and regions have set carbon neutrality targets, and green, low-carbon, and sustainable development have become an international consensus. Building a new power system primarily based on renewable energy is a crucial path to achieving carbon neutrality. However, the intermittent, volatile, and uncertain characteristics of renewable energy make it difficult to guarantee a balance between electricity supply and demand. Energy storage technology can increase the proportion of renewable energy utilization, reduce the impact on the power grid, and enhance the flexibility, economy, and security of the power system. Therefore, developing energy storage technology is a necessary condition for promoting energy structure transformation.

[0057] Energy storage technologies are mainly divided into mechanical energy storage, electromagnetic energy storage, and electrochemical energy storage. Among them, electrochemical energy storage is gradually gaining market share due to its advantages such as no geographical limitations, short construction period, flexible application, fast response speed, mature technology, high energy density, and high conversion efficiency. Electrochemical energy storage mainly relies on battery modules to collect and release energy. A battery module consists of multiple batteries connected in series or parallel, which are connected in series or parallel by welding the terminals and battery connectors between the batteries. However, during the welding process between the battery connectors and terminals, misalignment can easily occur because the connection between the battery connectors and terminals is planar. This can lead to poor welding or incomplete welding between the terminals and battery connectors, and cause deformation of the lower plastic of the battery after welding, thus affecting the safety performance of the battery module.

[0058] Therefore, in order to solve the welding positioning problem between the battery connector and the terminal post, such as Figure 1As shown, the inventors attempted to pre-drill grooves 502 on the terminals and corresponding through holes 501 on the battery connectors, achieving alignment between the battery connectors and terminals through the alignment of the through holes 501 and grooves 502. However, while this method achieves alignment between the battery connectors and terminals to a certain extent, misalignment still occurs when battery stacking is misaligned, and this misalignment is difficult to detect. Furthermore, the pre-drilled grooves 502 and through holes 501 prevent full welding between the terminals and battery connectors, limiting the current carrying capacity of the welding area and potentially leading to poor contact or increased contact resistance, thereby increasing the risk of safety issues such as overcharging and thermal runaway.

[0059] In view of this, embodiments of this application provide a battery connector, a battery module, and an energy storage device. The battery connector accommodates at least a portion of the terminals through a first groove on a first surface, and provides a welding device for welding through a second groove on a second surface corresponding to the first groove. This enables better alignment and full welding between the battery connector and the terminals, effectively avoiding deviations in the welding area, increasing the current carrying capacity of the welding area, and preventing poor contact or increased contact resistance in the welding area. This helps reduce the risk of safety problems such as overcharging and thermal runaway.

[0060] Specifically, this application discloses a battery connector, a battery module, and an energy storage device. The battery connector can be used in a battery to connect the terminals of two adjacent batteries. Exemplarily, the battery connector can be used with circular or square terminals. For example, when the battery terminal is circular, the circular terminal extends into the first groove of the battery connector, and the circular terminal abuts against the bottom surface of the first groove. Therefore, the first groove of the battery connector can be, for example, a circular first groove or a square first groove, to accommodate the circular terminal of the battery. Similarly, when the battery terminal is square, the square terminal extends into the first groove of the battery connector, and the square terminal abuts against the bottom surface of the first groove. Therefore, the first groove of the battery connector can be, for example, a square first groove, to accommodate the square terminal of the battery. It is evident that the battery connector of this application can be applied to batteries with circular terminals as well as batteries with square terminals, depending on the specific circumstances. This embodiment does not impose specific limitations on this.

[0061] To facilitate the explanation of the specific structure of the battery connector, the technical solution of this application will be further described below in conjunction with the embodiments and accompanying drawings. For ease of understanding, this embodiment will be described using the example of a circular first groove for the battery connector and a circular terminal for the battery.

[0062] Please see Figures 2 to 4 , Figure 2This is a schematic diagram of the structure of the battery connector provided in an embodiment of this application from one perspective; Figure 3 This is a schematic diagram of the battery connector provided in an embodiment of this application from another perspective; Figure 4 This is a cross-sectional view of a battery connector provided in an embodiment of this application. In a first aspect, this application discloses a battery connector 100 for connecting the terminals of two adjacent batteries. The battery connector 100 includes at least two welding portions 1 and a connecting portion 2. The two welding portions 1 are spaced apart along a first direction X. Each welding portion 1 has a first surface 11 and a second surface 12 facing away from the first surface 11. A first groove 111 is provided on the first surface 11, configured to accommodate at least a portion of the terminal. A second groove 121 is provided on the second surface 12 corresponding to the first groove 111, and the second groove 121 is configured as a welding area for welding with the terminal. The connecting portion 2 connects the two adjacent welding portions 1.

[0063] The battery connector 100 provided in this embodiment accommodates at least a portion of the terminal post through the first groove 111, which better achieves the alignment and connection between the battery connector 100 and the terminal post. Furthermore, it eliminates the need for pre-drilled through holes in the battery connector 100 and pre-drilled grooves in the terminal post, thus enabling full welding between the battery connector 100 and the terminal post. Simultaneously, compared to a flat surface connection between the battery connector 100 and the terminal post, the connection method where at least a portion of the terminal post extends into the first groove 111 increases the flow area between the battery connector 100 and the terminal post from a flat surface to a groove-shaped contact surface, which is beneficial for increasing the flow capacity of the welding area. In addition, when misalignment occurs between the battery connector 100 and the terminal post, it can be identified by the first groove 111 not being properly fitted with the terminal post, allowing for timely adjustment of the position between the battery connector 100 and the terminal post, thereby avoiding poor welding due to misalignment. Since the welding of the battery connector 100 to the terminal post is usually done using laser welding, the thickness of the battery connector 100 in the welding area directly affects the welding difficulty and the power required for laser welding. Therefore, the first groove 111 and the second groove 121 effectively reduce the thickness of the welding area, thereby reducing welding costs and difficulty. Furthermore, the second groove 121 provides positional guidance for the welding of the terminal post, making it easier for the laser to accurately identify the welding point. This effectively avoids deviations in the welding area, preventing poor contact or increased contact resistance, and increases the current carrying capacity of the welding area, thus reducing the risk of overcharging and thermal runaway.

[0064] It is understandable that the first direction X mentioned above is the direction from the center of the welded part 1 to the edge of the welded part 1.

[0065] Optionally, the number of the above-mentioned welding parts 1 can be two or more. For example, the number of welding parts 1 can be two, three, four, five, six, seven, eight, etc. This embodiment does not limit this.

[0066] Optionally, the material of the welded part 1 can be conductive materials such as copper or aluminum, and this embodiment does not limit this.

[0067] Optionally, the material of the connecting part 2 can be conductive materials such as copper or aluminum, and this embodiment does not limit this.

[0068] Optionally, the welding part 1 and the connecting part 2 can be formed separately or integrally. For example, the welding part 1 and the connecting part 2 are integrally formed, which facilitates the processing and manufacturing of the battery connector 100 and reduces the processing steps of the battery connector 100.

[0069] Optionally, the first groove 111 is formed on the first surface 11 by, for example, stamping, or by turning, etc. This embodiment does not limit this.

[0070] Alternatively, the second groove 121 can also be formed on the second surface 12 by means of, for example, stamping or turning, which will not be described in detail here.

[0071] For example, the first groove 111 and the second groove 121 are formed on the first surface 11 and the second surface 12, respectively, by stamping. This allows the projection of the second groove 121 onto the first surface 11 to coincide (or substantially coincide) with the second groove 121, eliminating the need to adjust the relative positions of the first groove 111 and the second groove 121 during processing, thus improving the precision of the battery connector 100. Furthermore, the stamping method reduces material waste, lowers costs, and ensures the consistency of the battery connector 100, thereby improving the production efficiency of the battery connector 100.

[0072] Please combine Figure 5 , Figure 5 This is a cross-sectional view of a battery connector (with chamfers in the first and second grooves) provided in an embodiment of this application. Optionally, as... Figure 5 As shown, a chamfer A is provided at the connection between the side wall surface and the bottom surface of the first groove 111.

[0073] Optionally, such as Figure 5 As shown, a chamfer A is provided at the connection between the side wall of the second groove 121 and the bottom surface of the second groove 121.

[0074] Optionally, such as Figure 5As shown, a chamfer A is provided at the connection between the side wall surface and the bottom surface of the first groove 111, and a chamfer A is provided at the connection between the side wall surface and the bottom surface of the second groove 121.

[0075] By chamfering the connection points of the sidewall and bottom of the first groove 111 and the second groove 121, respectively, demolding of the first groove 111 and the second groove 121 can be facilitated. This facilitates the manufacturing of the battery connector 100, simplifies the processing technology, and improves the production efficiency. Furthermore, the chamfering of the first groove 111, in conjunction with the chamfering on the terminal post, increases the current-carrying area of ​​the welding region, thereby increasing the current-carrying capacity of the welding region and further reducing the risk of overcharging and thermal runaway.

[0076] In some embodiments, the projection of the first groove 111 onto the second surface 12 is located within the second groove 121.

[0077] In other embodiments, the second groove 121 is located within the projection of the first groove 111 onto the second surface 12.

[0078] To further improve welding accuracy, some embodiments are designed with specific positional relationships between the first groove 111 and the second groove 121. Specifically, the projection of the first groove 111 onto the second surface 12 coincides with the second groove 121. This avoids misalignment between the first groove 111 and the second groove 121, which could lead to a shift in the connection position between the terminal and the battery connector 100. This improves the welding accuracy between the battery connector 100 and the terminal, facilitates full welding between them, increases the current-carrying capacity of the welding area, and reduces the risk of overcharging and thermal runaway.

[0079] It is understood that the projection of the first groove 111 onto the second surface 12 coincides with the second groove 121: this includes the case where the projection of the first groove 111 onto the second surface 12 completely coincides with the second groove 121, and the case where the projection of the first groove 111 onto the second surface 12 approximately coincides with the second groove 121. That is, it can be that the projection of the first groove 111 onto the second surface 12 completely coincides with the second groove 121; or, the projection of the first groove 111 onto the second surface 12 is within the second groove 121; or the second groove 121 is located within the projection of the first groove 111 onto the second surface 12.

[0080] Because batteries expand to a certain extent during cycling, the battery connector 100 is susceptible to compression or stretching, which can lead to deformation or even breakage at the connection point 2. Therefore, this application also designs a solution to prevent breakage of the battery connector 100, as detailed below:

[0081] As an optional implementation method, such as Figures 3 to 5 As shown, the connecting portion 2 includes a first arched structure 21 and a second arched structure 22, which are continuously arranged along a first direction X. The second arched structure 22 has a convex direction opposite to that of the first arched structure 21. The first arched structure 21 and the second arched structure 22 with opposite convex directions provide a buffer for battery expansion. Furthermore, the space between the first arched structure 21 and the second arched structure 22 provides heat dissipation space for the battery, which is beneficial for improving the safety performance of the battery module. In addition, compared to an embodiment with a single-direction convex arched structure, the stress on the connecting portion 2 can be dispersed, preventing stress concentration in one direction. This avoids cracks or breakage at the top and edges of the first arched structure 21 and the second arched structure 22 due to stress concentration, thus improving the reliability of the battery connector 100.

[0082] Please combine Figure 6 , Figure 6 This is a schematic diagram of the battery connector provided in this application embodiment, including multiple first arched structures. Optionally, the stress on the connection portion 2 can be further dispersed by increasing the number of first arched structures 21 and second arched structures 22. Specifically, multiple first arched structures 21 are provided, arranged sequentially along a first direction X, with a second arched structure 22 between adjacent first arched structures 21. The multiple first arched structures 21 and multiple second arched structures 22 further disperse the stress on the connection portion 2, which helps to further prevent cracks or breakages at the top and edges of the first arched structures 21 and second arched structures 22, thereby further improving the reliability of the battery connector 100.

[0083] Optionally, the plurality of first arch structures 21 mentioned above can be two or more, for example, two, three, four, five, six, seven, eight, etc. This embodiment does not limit this.

[0084] As an optional implementation, the first arched structure 21 protrudes from the first surface 11 to the second surface 12, and the second arched structure 22 protrudes in the opposite direction to the first arched structure 21. At least one portion of the second arched structure 22 is configured to be embedded between two adjacent batteries. By embedding a portion of the second arched structure 22 between two adjacent batteries, the height space of the battery module can be effectively utilized, thereby improving the energy density of the battery module.

[0085] Please see Figure 7 , Figure 7 This is a structural schematic diagram of a battery connector provided in an embodiment of this application (showing the protrusion heights of the first and second arched structures). Optionally, as... Figure 7 As shown, the height B of the first arched structure 21 protruding from the first surface is 0.1 to 5 mm.

[0086] Optionally, the height C of the second arched structure 22 protruding from the second surface is 1.5 to 5 mm.

[0087] By setting the protrusion height range of the first arch structure 21 and the second arch structure 22, a larger stretch margin can be provided for the battery connector 100, and sufficient buffer margin can be provided for battery expansion. In addition, it can also avoid the situation where the first arch structure 21 and the second arch structure 22 protrude too high, which would weaken the structural strength of the first arch structure 21 and the second arch structure 22, thereby helping to reduce the risk of cracks or breakage of the first arch structure 21 and the second arch structure 22.

[0088] Optionally, the height B of the first arch structure 21 protruding from the first surface is 0.1 to 5 mm, and can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. This embodiment does not limit this.

[0089] Optionally, the height B of the first arched structure 21 protruding from the first surface is 0.1 to 5 mm, which can be 0.1 to 5 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 0.5 to 5 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 1 to 5 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 1.5 to 5 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 1.5 to 4.5 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 1.5 to 4 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 1.5 to 3.5 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 1.5 to 3 mm. Alternatively, the height B of the first arched structure 21 protruding from the first surface can be 2 to 3 mm, etc., and this embodiment does not limit this.

[0090] Optionally, the height C of the second arched structure 22 protruding from the second surface is 1.5 to 5 mm, and can be 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc. This embodiment does not limit this.

[0091] Optionally, the height C of the second arched structure 22 protruding from the second surface can be 1.5 to 5 mm. Alternatively, the height C of the second arched structure 22 protruding from the second surface can be 1.5 to 4.5 mm. Or, the height C of the second arched structure 22 protruding from the second surface can be 1.5 to 4 mm. Or, the height C of the second arched structure 22 protruding from the second surface can be 1.5 to 3.5 mm. Or, the height C of the second arched structure 22 protruding from the second surface can be 1.5 to 3 mm. Or, the height C of the second arched structure 22 protruding from the second surface can be 2 to 3 mm, etc. This embodiment does not limit this specific value.

[0092] Optionally, the radius of curvature of the first arch structure 21 is smaller than that of the second arch structure 22. In this way, the first arch structure 21 provides greater bending stiffness to the connection portion 2, while the second arch structure 22 disperses stress, thereby reducing local stress in the connection portion 2 and providing a larger tensile allowance. This, in turn, improves the battery connector 100's resistance to battery expansion loads and increases the overall structural toughness of the battery connector 100.

[0093] As an optional implementation, the thickness of the welded portion 1, excluding the first groove 111, is the same as the thickness of the connecting portion 2. This results in a small difference in internal resistance throughout the battery connector 100, leading to consistent current carrying capacity across the battery connector 100. This helps reduce temperature differences throughout the battery connector 100 and mitigates the risk of localized overheating. Furthermore, having the welded portion 1, excluding the first groove 111, have the same thickness as the connecting portion 2 also improves the overall performance and reliability of the battery connector 100.

[0094] Please see Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application; Figure 9 This is a schematic diagram of another battery module structure provided in this application embodiment. Secondly, this application embodiment also discloses a battery module 200, including a plurality of batteries 201 arranged in sequence, and a battery connector 100 as described in the first aspect above. The battery connector 100 includes at least two welding portions 1, with the terminals 202 on two adjacent batteries 201 extending at least partially into the first grooves 111 of the two adjacent welding portions 1, and the terminals 202 abutting against the bottom surface of the first grooves 111, so that the battery connector 100 and the terminals 202 are electrically connected. The battery module 200 with this battery connector 100 can also better achieve alignment and full welding between the battery connector 100 and the terminals 202, effectively avoiding deviations in the welding area, which is beneficial for increasing the current carrying capacity of the welding area, avoiding poor contact or increased contact resistance in the welding area, thereby reducing the risk of overcharging and thermal runaway, and thus improving the safety performance of the battery module 200.

[0095] It is understood that the battery 201 described above has two terminals 202, one of which is the positive terminal and the other is the negative terminal. When the battery connector 100 includes two welded portions 1, such as... Figure 8 As shown, two welded portions 1 are electrically connected to different polarity terminals 202 on different batteries 201, so that multiple batteries 201 are connected in series. When the battery connector 100 includes at least three welded portions 1, a portion of the welded portions 1 are electrically connected to the same polarity terminals 202 (e.g., positive terminals) on different batteries 201 to achieve parallel connection between these batteries 201, and the other portion of the welded portions 1 are electrically connected to the same polarity terminals 202 (e.g., negative terminals) on other different batteries 201 to achieve parallel connection between these batteries 201, thereby connecting these two portions of batteries 201 in series. The description is based on the case where the battery connector 100 includes four welded portions 1, for example, as shown... Figure 7As shown, the battery connector 100 includes four welding parts 1, which are arranged sequentially along the first direction X. Along the first direction X, the first two welding parts 1 are electrically connected to the positive terminals of two adjacent batteries 201, and the last two welding parts 1 are electrically connected to the negative terminals of another two adjacent batteries 201. In this way, the first two batteries 201 are connected in parallel along the first direction X, and the last two batteries 201 are also connected in parallel, and the two parallel battery packs are connected in series.

[0096] Optionally, the plurality of batteries 201 arranged in sequence can be fixed by cable ties or straps, or by placing them in a battery box, etc. This embodiment does not limit this.

[0097] As an optional implementation, the outer side of the portion of the terminal post 202 located in the first groove 111 has a gap with the inner side of the first groove 111. This gap between the terminal post and the first groove facilitates the alignment and connection of the battery connector with the terminal post.

[0098] It is understood that the first groove 111 has a bottom surface and a side wall surface, and the side wall surface forms the inner surface of the first groove 111.

[0099] To further improve alignment and welding accuracy, some embodiments design the widths of the first groove 111 and the second groove 121 as follows:

[0100] Optionally, the distance between the two points furthest apart in the projection of the inner side of the first groove 111 onto the first surface 11 is the first distance, and the distance between the two points furthest apart in the projection of the pole post 202 onto the first surface 11 is the second distance, with the first distance being 1mm-2mm larger than the second distance.

[0101] Optionally, the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1mm to 2mm.

[0102] Optionally, the distance between the two furthest points in the projection of the inner side of the first groove 111 onto the first surface 11 is the first distance, and the distance between the two furthest points in the projection of the pole post 202 onto the first surface 11 is the second distance. The first distance is 1mm-2mm larger than the second distance, and the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1mm-2mm.

[0103] In the above embodiments, by setting the first distance to be 1mm to 2mm larger than the second distance, it is possible to ensure that the first groove 111 can accommodate at least part of the electrode post, while avoiding the electrode post from shifting in the first groove 111 due to excessive width, thus preventing welding misalignment. This facilitates better alignment and connection between the battery connector 100 and the electrode post. Furthermore, by setting the depth of the first groove 111 to 1mm to 2mm, it is possible to ensure that the first groove 111 can accommodate at least part of the electrode post, better facilitating alignment and connection between the battery connector 100 and the electrode post. However, it also avoids the situation where the battery connector piece is too thin at the first groove 111 due to excessive depth, resulting in insufficient mechanical strength and increased welding difficulty. This helps reduce the risk of deformation or breakage of the battery connector piece and also reduces processing and welding difficulty.

[0104] Optionally, the first distance is 1mm to 2mm larger than the second distance. For example, it can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. This embodiment does not limit this.

[0105] Optionally, the first distance being 1mm to 2mm larger than the second distance could be 1mm to 2mm larger than the second distance, or 1.2mm to 2mm larger than the second distance, or 1.4mm to 2mm larger than the second distance, or 1.4mm to 1.8mm larger than the second distance, etc. This embodiment does not limit this to any particular type.

[0106] Optionally, the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1mm to 2mm, and can be, for example, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. This embodiment does not limit this.

[0107] Optionally, the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1mm to 2mm. This could mean the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1mm to 2mm. Alternatively, the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1.2mm to 2mm. Alternatively, the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1.4mm to 2mm. Alternatively, the depth of the first groove 111 along the thickness direction of the battery connector 100 is 1.4mm to 1.8mm, etc. This embodiment does not limit this specific depth.

[0108] Optionally, the distance between the two furthest points in the projection of the inner side of the second groove 121 onto the second surface 12 is the third distance, and the distance between the two furthest points in the projection of the pole post 202 onto the second surface 12 is the second distance. The third distance is 1 mm to 2 mm larger than the second distance.

[0109] Optionally, the depth of the second groove 121 along the thickness direction of the battery connector 100 is 1mm to 2mm.

[0110] Optionally, the distance between the two furthest points in the projection of the inner side of the second groove 121 onto the second surface 12 is the third distance, the distance between the two furthest points in the projection of the pole post 202 onto the second surface 12 is the second distance, the third distance is 1mm to 2mm larger than the second distance, and the depth of the second groove 121 is 1mm to 2mm along the thickness direction of the battery connector 100.

[0111] In the above embodiments, by setting the third distance to be 1mm to 2mm larger than the second distance, it is ensured that the welding area can cover the width of the electrode post, which is beneficial for achieving full welding between the battery connector 100 and the electrode post. This also increases the current carrying capacity of the welding area, thereby reducing the risk of safety issues such as overcharging and thermal runaway. Furthermore, by setting the depth of the second groove 121 to 1mm to 2mm, it provides positional guidance for welding the electrode post, making it easier for the laser to accurately identify the welding point, effectively avoiding deviations in the welding area. It also avoids the situation where the battery connector piece is too thin at the first groove 111 due to excessive depth of the second groove 121, resulting in insufficient mechanical strength and increased welding difficulty. This helps reduce the risk of deformation or breakage of the battery connector piece and also reduces processing and welding difficulty.

[0112] It is understood that the second groove 121 has a bottom surface and a side wall surface, with the side wall surface forming the inner surface of the second groove 121.

[0113] Optionally, the third distance is 1mm to 2mm larger than the second distance. For example, it can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. This embodiment does not limit this.

[0114] Optionally, the third distance being 1mm to 2mm larger than the second distance could be 1mm to 2mm larger than the second distance, or 1.2mm to 2mm larger than the second distance, or 1.4mm to 2mm larger than the second distance, or 1.4mm to 1.8mm larger than the second distance, etc. This embodiment does not limit this to any particular type.

[0115] Optionally, the depth of the second groove 121 along the thickness direction of the battery connector 100 is 1mm to 2mm, and can be, for example, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. This embodiment does not limit this.

[0116] Optionally, the depth of the second groove 121 along the thickness direction of the battery connector 100 is 1mm to 2mm. This could be 1mm to 2mm, 1.2mm to 2mm, 1.4mm to 2mm, or 1.4mm to 1.8mm, etc. This embodiment does not limit the specific depth of the groove.

[0117] As an optional implementation, a welding material is provided between the battery connector 100 and the terminal 202. Through the bonding effect of the welding material after heating, melting, and solidifying between the battery connector 100 and the terminal 202, misalignment of the battery connector 100 and the terminal 202 can be avoided after the battery connector 100 and the terminal 202 are aligned and connected. Furthermore, the welding material can fill the gaps between the battery connector 100 and the terminal 202, ensuring the stability of the electrical connection. This increases the current carrying capacity of the welding area and avoids poor contact or increased contact resistance, thereby reducing the risk of overcharging and thermal runaway. In addition, the flux in the welding material can remove oxides, improving the reliability and quality of the welding between the battery connector 100 and the terminal 202.

[0118] Optionally, the aforementioned soldering materials include, but are not limited to, solder paste, lead solder paste, etc.

[0119] For example, solder paste can be applied to the terminal post 202, which extends into the first groove 111, allowing the solder paste to abut against the bottom surface of the first groove 111. The solder paste, after being heated and melted, solidifies and bonds between the terminal post 202 and the battery connector 100, thus achieving a fixed connection between the battery connector 100 and the terminal post 202. Alternatively, as another example, solder paste can be applied to the first groove 111, with the terminal post 202 extending into the first groove 111, allowing the solder paste to abut against the top surface of the terminal post 202. The solder paste, after being heated and melted, solidifies and bonds between the terminal post 202 and the battery connector 100, thus achieving a fixed connection between the battery connector 100 and the terminal post 202.

[0120] As an optional implementation method, such as Figure 9 As shown, the battery connector 100 has 2N welding portions 1, where N is a positive integer and N is greater than 1. These 2N welding portions 1 are sequentially arranged along a first direction X. N welding portions 1 are used to connect N adjacent batteries 201 in parallel to form a first sub-battery pack, and the other N welding portions 1 are used to connect another N adjacent batteries 201 in parallel to form a second sub-battery pack. The first and second sub-battery packs are connected in series. By connecting the parallel first and second battery packs in series, the total capacity of the battery module 200 can be increased, extending its service life. Furthermore, the voltage stability of the battery module 200 can be improved, making it suitable for applications requiring high voltage output. In addition, by connecting the N batteries 201 in parallel, the load can be distributed among them, reducing the stress on individual batteries 201 and thus extending their lifespan.

[0121] Optionally, N is a positive integer and is greater than 1. N can be 2, 3, 4, 5, 6, 7, 8, etc. This embodiment does not limit this.

[0122] For example, Figure 9 As shown, N is 2, meaning that the welding part 1 of the battery connector 100 includes 4 parts. Figure 9 As shown, in the four welding parts, along the first direction, the two welding parts located in the front are connected to the same polarity terminal 202 (e.g., positive terminal) of two adjacent batteries 201, and the two welding parts located in the back are connected to the same polarity terminal 202 (e.g., negative terminal) of another two adjacent batteries. Then, one of the two welding parts located in the front and one of the two welding parts located in the back are connected in series.

[0123] As another example, when N is 3, that is, when the battery connector has 6 welded parts, the 3 welded parts in the front direction can be connected to the same polarity terminals 202 (e.g., positive terminals) of 3 adjacent batteries 201 along the first direction, and the 3 welded parts in the back direction can be connected to the same polarity terminals 202 (e.g., negative terminals) of another 3 adjacent batteries. Then, one of the 3 welded parts in the front and one of the 3 welded parts in the back are connected in series.

[0124] Please see Figure 10 , Figure 10This is a schematic diagram of the structure of the energy storage device provided in the embodiments of this application. In a third aspect, the embodiments of this application also disclose an energy storage device 300, including the battery module 200 as described in the second aspect above. The energy storage device 300 includes large-scale energy storage power stations applied on the wind power or photovoltaic power station side, energy storage containers applied on the grid side, and small energy storage cabinets applied on the power consumption side, etc., which are not limited in this embodiment.

[0125] For example, such as Figure 10 As shown, this application embodiment uses the application of the energy storage device 300 in a household energy storage scenario on the electricity consumption side as an example for further explanation, but the energy storage device 300 of this application is not limited to household energy storage scenarios. This application provides a household energy storage system, which includes a power conversion device 301 (photovoltaic panel), a first user load 302 (e.g., street light), a second user load 303 (e.g., household appliances such as air conditioners), and an energy storage device 300. The energy storage device 300 is a small energy storage box that can be wall-mounted on an outdoor wall. Specifically, the power conversion device 301 can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 300 is used to store this electrical energy and supply it to street lights and household appliances during periods of high electricity prices, or to provide power when the power grid is interrupted / out of service.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery connector, characterized in that, The battery connector is used to connect the terminals of two adjacent batteries, and the battery connector includes: At least two welding portions are spaced apart along a first direction. Each welding portion has a first surface and a second surface opposite to the first surface. The first surface has a first groove configured to accommodate at least a portion of the electrode post. The second surface has a second groove corresponding to the first groove, configured as a welding area for welding with the electrode post. A connecting portion, which connects two adjacent welded portions.

2. The battery connector according to claim 1, characterized in that, The projection of the first groove onto the second surface coincides with the second groove.

3. The battery connector according to claim 1, characterized in that, The junction between the sidewall and bottom surface of the first groove is chamfered; and / or, A chamfer is provided at the connection between the side wall surface and the bottom surface of the second groove.

4. The battery connector according to claim 1, characterized in that, The connecting part includes a first arch structure and a second arch structure, which are continuously arranged along the first direction, and the protrusion direction of the second arch structure is opposite to that of the first arch structure.

5. The battery connector according to claim 4, characterized in that, The first arch structure includes multiple first arch structures arranged sequentially along the first direction. A second arch structure is provided between two adjacent first arch structures. The first arch structure protrudes from the first surface to the second surface, and the second arch structure protrudes in the opposite direction to the first arch structure.

6. The battery connector according to claim 5, characterized in that, The height of the first arched structure protruding from the first surface is 0.1–5 mm; and / or, The height of the second arched structure protruding from the second surface is 1.5 to 5 mm.

7. The battery connector according to claim 4, characterized in that, The radius of curvature of the first arch structure is smaller than that of the second arch structure.

8. The battery connector according to any one of claims 1-7, characterized in that, The thickness of the welded portion, excluding the location of the first groove, is the same as the thickness of the connecting portion.

9. A battery module, characterized in that, include: Multiple batteries arranged in sequence; as well as The battery connector according to any one of claims 1-8, the battery connector includes at least two of the welding portions, the terminals on two adjacent batteries respectively extend into the first grooves of the two adjacent welding portions, and the terminals abut against the bottom surface of the first grooves to make the battery connector electrically connected to the terminals.

10. The battery module according to claim 9, characterized in that, The outer side of the portion of the pole located in the first groove has a gap with the inner side of the first groove.

11. The battery module according to claim 10, characterized in that, The distance between the two furthest points in the projection of the inner side of the first groove onto the first surface is the first distance, and the distance between the two furthest points in the projection of the pole onto the first surface is the second distance. The first distance is 1mm-2mm larger than the second distance. And / or, Along the thickness direction of the battery connector, the depth of the first groove is 1mm to 2mm.

12. The battery module according to claim 9, characterized in that, The distance between the two furthest points in the projection of the inner side of the second groove onto the second surface is the third distance, and the distance between the two furthest points in the projection of the pole onto the first surface is the second distance. The third distance is 1mm-2mm larger than the second distance. And / or, Along the thickness direction of the battery connector, the depth of the second groove is 1mm to 2mm.

13. An energy storage device, characterized in that, Includes the battery module as described in any one of claims 9-12.

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