Battery module and battery pack

Abstract

The invention relates to a battery module and a battery pack, the battery module comprises a body and a second conducting strip, the body is used for storing electric energy, and the body is provided with a first conducting strip and an electrode base; one end of the second conducting strip is connected with the first conducting strip and is fixed on the electrode base together with the first conducting strip, and the other end is connected with an adjacent battery module; wherein the second conducting strip is provided with a first groove, the first conducting strip can extend into the first groove, and a conducting block is further arranged between the first groove and the first conducting strip; the distance between the upper arm and the lower arm of the first groove is gradually increased in the direction of going deep into the first groove; the first conducting strip is provided with a first clamping concave part, so that a mounting space with a rhombic section is formed between the first conducting strip and the second conducting strip, and the conducting block is mounted in the mounting space. According to the battery module, when the current flows through the second conducting strip, the heat productivity of the second conducting strip is reduced, and the transmission efficiency of the current between the battery modules is improved.

Description

[0001] This application is a divisional application. The application number of the original application is 202410805164.5, and the original application date is June 20, 2024. The entire content of the original application is incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to a battery module and a battery pack. Background Art

[0003] Energy storage battery packs are essential components of solar photovoltaic power generation systems. Their primary function is to store the system's energy and supply power to loads during periods of low sunlight, at night, and in emergency situations. A battery pack consists of a housing and battery modules installed within it. The modules are connected by conductive plates, typically made of copper, hence the name "copper plate."

[0004] As people's demand for electrical energy storage and usage increases, the current flowing between battery modules is getting larger and larger. Since the existing conductive sheets have high resistance and high heat generation, the performance of the battery pack is restricted. Summary of the Invention

[0005] The present application provides a battery module and a battery pack, which are used to solve the problem that the resistance of the conductive sheet in the existing battery module is large and restricts the performance of the battery pack.

[0006] A battery module provided in an embodiment of the present application includes: a main body and a second conductive sheet, the main body being used to store electrical energy, the main body having a first conductive sheet and an electrode base; one end of the second conductive sheet is connected to the first conductive sheet and fixed together to the electrode base, and the other end is used to connect to an adjacent battery module; wherein, the second conductive sheet is provided with a first groove, the first conductive sheet can extend into the first groove, and a conductive block is further provided between the first groove and the first conductive sheet; along the direction of deepening into the interior of the first groove, the distance between the upper arm and the lower arm of the first groove gradually increases; the first conductive sheet is provided with a first clamping recess, so that an installation space with a diamond-shaped cross-section is formed between the first conductive sheet and the second conductive sheet, and the conductive block is installed in the installation space.

[0007] In a specific embodiment, the surface of the second conductive sheet has a fusible layer, which melts when the temperature reaches a preset temperature. The material of the fusible layer is tin or nickel, and the fusible layer is formed on the surface of the second conductive sheet by electroplating.

[0008] In a specific embodiment, when viewed along the thickness direction of the second conductive sheet, the conductive block protrudes from the edge of the first groove.

[0009] In a specific embodiment, the cross-section of the conductive block is trapezoidal, and the first conductive sheet is provided with a first snap-fit ​​recess so that at least one installation space with a diamond-shaped cross-section is formed between the first conductive sheet and the second conductive sheet, and the conductive block is installed in the installation space.

[0010] In a specific embodiment, the thickness d of the conductive block satisfies: 0.5 mm ≤ d2 ≤ 10 mm;

[0011] And / or, a ratio of a depth h of the first groove to a width w of the second conductive sheet satisfies: 0.5≤h / w≤2.

[0012] In a specific embodiment, the first conductive sheet is provided with a second groove, and the first groove is plugged into the second groove.

[0013] In a specific embodiment, the conductive block is provided at least one between the upper arm of the first groove and the upper arm of the second groove, between the lower arm of the first groove and the lower arm of the second groove, and between the upper arm of the first groove and the lower wall of the second groove.

[0014] In a specific embodiment, one of the first groove and the second groove is provided with a protruding portion, and the other is provided with a recessed portion, and the protruding portion cooperates with the recessed portion.

[0015] In a specific embodiment, the raised portion or the recessed portion is arranged on the upper surface and lower surface of the arm portion of the first groove extending into the second groove, and the upper surface of the arm portion not extending into the second groove; the recessed portion or the raised portion is arranged on the upper surface and lower surface of the arm portion of the second groove extending into the first groove, and the lower surface of the arm portion not extending into the first groove.

[0016] A battery pack provided in an embodiment of the present application includes: a housing and the battery module described above, wherein the battery module is installed in the housing.

[0017] In the present application, by providing a first groove, the first conductive sheet extends into the first groove, thereby increasing the contact area between the first and second conductive sheets. This reduces the resistance of the current path between the battery modules, reduces the heat generated by the second conductive sheet when current flows through it, and thus improves the current transmission efficiency between the battery modules. Furthermore, by providing a conductive block between the first groove and the first conductive sheet, the cross-sectional area at the connection between the second and first conductive sheets is increased, further reducing the resistance of the current path between the battery modules, reducing the heat generated by the second conductive sheet when current flows through it, and improving the current transmission efficiency between the battery modules. Because the distance between the upper and lower arms of the first groove gradually increases and the first conductive sheet is provided with a first engaging recess, the first groove restricts the movement of the conductive block in the first direction, and the conductive block restricts the movement of the first conductive sheet in the first direction, thereby securing the first, second, and third conductive sheets, thereby improving the reliability of their connection. Since the first conductive sheet, the second conductive sheet and the conductive block are clamped together, they are not easy to move relative to each other, so that when external vibration occurs, the first conductive sheet, the second conductive sheet and the conductive block can maintain a good connection state.

[0018] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a battery pack provided in this application in a specific embodiment;

[0020] Figure 2 for Figure 1 Exploded view of the battery pack;

[0021] Figure 3 This is a schematic structural diagram of a battery module provided in this application in a specific embodiment;

[0022] Figure 4 for Figure 3 A partial enlarged view of area A in the middle;

[0023] Figure 5 This is a schematic structural diagram of the second conductive sheet provided in this application in a specific embodiment;

[0024] Figure 6 This is a structural schematic diagram of the second conductive sheet and the first conductive sheet being connected and fixed to the electrode base;

[0025] Figure 7 for Figure 6 A schematic structural diagram of a second conductive sheet and a first conductive sheet connected with a conductive block disposed therebetween;

[0026] Figure 8 for Figure 6 Another structural diagram of a second conductive sheet and a first conductive sheet being connected and a conductive block being arranged between the two;

[0027] Figure 9 for Figure 6 Another structural diagram in which the second conductive sheet is connected to the first conductive sheet and a conductive block is provided between the two;

[0028] Figure 10 for Figure 9 Exploded diagram;

[0029] Figure 11 is a structural schematic diagram of another structure of the first conductive sheet;

[0030] Figure 12 for Figure 11 A schematic structural diagram of the cooperation between the first conductive sheet and the second conductive sheet;

[0031] Figure 13 for Figure 7 A schematic structural diagram of a second conductive sheet and a first conductive sheet in which a protrusion or a recess is provided;

[0032] Figure 14 for Figure 12 A schematic structural diagram of a second conductive sheet and a first conductive sheet in which a protrusion or a recess is provided;

[0033] Figure 15 for Figure 11 Another structural diagram of the first conductive sheet and the second conductive sheet cooperating with each other;

[0034] Figure 16 for Figure 15 Exploded diagram.

[0035] Reference numerals:

[0036] 10-battery module;

[0037] 20-upper cover;

[0038] 30-Liquid cooling plate;

[0039] 1-Ontology;

[0040] 11-battery cell;

[0041] 12-end plate;

[0042] 13-first conductive sheet;

[0043] 131- second groove;

[0044] 132-depression;

[0045] 133-first clamping recess;

[0046] 14-electrode base;

[0047] 15- steel belt;

[0048] 2- second conductive sheet;

[0049] 21- first groove;

[0050] 22- raised portion;

[0051] 23- second engaging recess;

[0052] 3- conductive block;

[0053] 4-Connectors.

[0054] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0055] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0056] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0057] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0058] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0059] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0060] Figure 1 This is a schematic diagram of the structure of the battery pack provided in this application. Figure 2 for Figure 1 Exploded view of the battery pack. Figure 1 and Figure 2 As shown, the battery pack includes an outer shell and battery modules 10, which are mounted within the outer shell. Specifically, the outer shell consists of an upper cover 20 and a liquid cooling plate 30. A cavity is defined between the upper cover 20 and the liquid cooling plate 30, and multiple battery modules 10 are mounted within the cavity. The battery modules 10 generate heat during operation, and the liquid cooling plate 30 cools the battery modules 10, keeping them within an appropriate temperature range to ensure proper operation of the battery pack.

[0061] Figure 3 This is a schematic structural diagram of the battery module 10 provided in this application. Figure 4 for Figure 3 A partial enlarged view of area A in the middle. Figure 5 This is a schematic structural diagram of the second conductive sheet 2 provided in this application. Figure 6 Schematic diagram of the structure in which the second conductive sheet 2 and the first conductive sheet 13 are connected and fixed to the electrode base 14. Figures 3 to 6 As shown, the battery module 10 includes: a main body 1 and a second conductive sheet 2. The main body 1 is used to store electrical energy. The main body 1 has a first conductive sheet 13 and an electrode base 14. One end of the second conductive sheet 2 is connected to the first conductive sheet 13 and fixed to the electrode base 14, and the other end is used to connect to the adjacent battery module 10; wherein, the second conductive sheet 2 is provided with a first groove 21, and the first conductive sheet 13 can extend into the first groove 21.

[0062] In this embodiment, if Figures 4 to 6 As shown, by providing the first groove 21, the first conductive sheet 13 is extended into the first groove 21, thereby increasing the contact area between the first conductive sheet 13 and the second conductive sheet 2, thereby reducing the resistance of the path for current to flow between the battery modules 10, reducing the heat generated by the second conductive sheet 2 when current flows through the second conductive sheet 2, and thereby improving the current transmission efficiency between the battery modules 10.

[0063] The extension direction of the second conductive sheet 2 is defined as a first direction X, and the thickness direction of the second conductive sheet 2 is defined as a second direction Y. The first direction X may be perpendicular to the second direction Y.

[0064] Further, such as Figure 7 As shown, a conductive block 3 is further provided between the first groove 21 and the first conductive sheet 13. The provision of the conductive block 3 increases the cross-sectional area of ​​the connection between the second conductive sheet 2 and the first conductive sheet 13, further reducing the resistance of the path for current flow between the battery modules 10, reducing the heat generated by the second conductive sheet 2 when current flows through it, and improving the current transmission efficiency between the battery modules 10.

[0065] Optionally, one or two conductive blocks 3 are disposed between the first groove 21 and the first conductive sheet 13 .

[0066] Preferably, when observed along the second direction Y, the conductive block 3 protrudes from the edge of the first groove 21, so that the contact area between the conductive block 3 and the second conductive sheet 2 is larger, and the contact area between the conductive block 3 and the first conductive sheet 13 is also larger, thereby making the electrical connection effect between the second conductive sheet 2, the conductive block 3 and the first conductive sheet 13 better.

[0067] In a specific embodiment, Figure 8 As shown, the distance between the upper arm and the lower arm of the first groove 21 gradually increases as it goes deeper into the first groove 21; the cross-section of the conductive block 3 is trapezoidal, and its shape corresponds to the shape of the first groove 21, so that the conductive block 3 can fit well with the upper arm or the lower arm of the first groove 21, and at the same time, the conductive block 3 is not easy to fall off from the first groove 21, thereby improving the connection reliability between the second conductive sheet 2 and the conductive block 3.

[0068] Further, such as Figure 9 and Figure 10 As shown, the first conductive sheet 13 is provided with a first engaging recess 133 , so that a mounting space with a diamond-shaped cross section is formed between the first conductive sheet 13 and the second conductive sheet 2 , and the conductive block 3 is mounted in the mounting space.

[0069] like Figure 6 and Figure 10 As shown, since the installation space is prismatic, the first groove 21 will limit the movement of the conductive block 3 along the first direction X, and the conductive block 3 will limit the movement of the first conductive sheet 13 along the first direction X, so that the first conductive sheet 13, the second conductive sheet 2 and the conductive block 3 are clamped together, thereby improving the connection reliability of the three.

[0070] It is understandable that the first engaging recess 133 may be provided only on one side of the first conductive sheet 13 along the second direction Y, or may be provided on both sides of the first conductive sheet 13 along the second direction Y. Preferably, the first engaging recess 133 is provided on both sides of the first conductive sheet 13 along the second direction Y.

[0071] In addition, the first conductive sheet 13 and the second conductive sheet 2 may be matched first, and then the conductive block 3 may be inserted into the installation space between the first conductive sheet 13 and the second conductive sheet 2 from the side.

[0072] Furthermore, if Figure 6 As shown, the second conductive sheet 2 and the first conductive sheet 13 are fixed to the electrode base 14 together so that the second conductive sheet 2 is not easy to move relative to the first conductive sheet 13, thereby ensuring the reliability of the electrical connection between the two and further ensuring the reliability of the battery pack.

[0073] Specifically, such as Figure 3 As shown, the body 1 includes staggered battery cells 11 and a fireproof layer. The battery cells 11 are used to input, output, and store electrical energy. The fireproof layer is used to prevent the fire from spreading between adjacent battery cells 11 when the battery cells 11 catch fire, thereby avoiding thermal runaway of the entire battery module 10 and improving the safety of the battery module 10 and the battery pack. The battery module 10 has end plates 12 on both sides. The end plates 12 can protect the battery cells 11. The electrode base 14 can be installed on the end plates 12 by screw connection, clamping, welding, etc. Two steel strips 15 bundle the battery cells 11, the fireproof layer, and the end plates 12 to prevent the battery cells 11 from expanding during operation.

[0074] The fireproof layer consists of mica sheets and an insulation layer. Mica sheets offer excellent electrical properties, heat resistance, chemical stability, and mechanical properties. The mica sheets are made from natural minerals, resulting in low cost and no environmental pollution during production. Materials for the insulation layer include, but are not limited to, polycarbonate (PC), ceramic, polyethylene (PP), and nylon.

[0075] In addition, the first conductive sheet 13 is disposed on the top of the battery cell 11. By connecting to the electrodes of adjacent battery cells 11, the adjacent battery cells 11 are electrically connected, thereby achieving the series connection of all battery cells 11 in the battery module 10. Specifically, along the arrangement direction of the battery cells 11, the first conductive sheet 13 located at the edge of the battery module 10 partially protrudes from the battery cells 11 to above the electrode base 14, thereby facilitating the connection between the first conductive sheet 13 and the second conductive sheet 2, and facilitating the fixing of the first conductive sheet 13 and the second conductive sheet 2 to the electrode base 14. The first conductive sheet 13 is generally made of aluminum and is therefore often referred to as an "aluminum bar."

[0076] In a specific embodiment, the surface of the second conductive sheet 2 has a fusible layer, and the fusible layer melts when the temperature reaches a preset temperature.

[0077] In this embodiment, the fusible layer is provided so that when the temperature of the second conductive sheet 2 reaches a preset temperature, the fusible layer can absorb a certain amount of heat through phase change, thereby improving the heat resistance of the second conductive sheet 2. At the same time, the fusible layer increases the cross-sectional area of ​​the second conductive sheet 2, reduces the resistance of the second conductive sheet 2, reduces the heat generated by the second conductive sheet 2 when current flows through it, and improves the current transmission efficiency between the battery modules 10.

[0078] Furthermore, the preset temperature is 110° C. to 130° C. For example, the preset temperature may be 110° C., 112° C., 115° C., 118° C., 120° C., 122° C., 125° C., 128° C., 130° C., and the like.

[0079] The value of the preset temperature should not be too large or too small. If the value of the preset temperature is too large (for example, greater than 130°C), the probability of the battery cell catching fire before the fusible layer melts is high, making it difficult to improve the heat resistance of the second conductive sheet 2 through phase change. If the value of the preset temperature is too small (for example, less than 110°C), the fusible layer will melt easily, affecting the stability of the second conductive sheet 2. Therefore, the value of the preset temperature should be selected within a reasonable range. Preferably, the preset temperature is 120°C. It is understandable that the value of the preset temperature can be adjusted according to actual conditions or experience.

[0080] Furthermore, the fusible layer has poor fluidity after melting, so the melted fusible layer remains attached to the surface of the second conductive sheet 2 and does not drip from the second conductive sheet 2, thereby preventing it from affecting or damaging other structures of the battery pack. At the same time, after the temperature of the second conductive sheet 2 drops, the melted fusible layer solidifies on the surface of the second conductive sheet 2, resulting in a larger cross-sectional area of ​​the second conductive sheet 2.

[0081] Specifically, the fusible layer is made of tin or nickel and is formed on the surface of the second conductive sheet 2 by electroplating. Since tin or nickel are relatively soft, the fusible layer is made of tin or nickel to ensure a high degree of contact between the fusible layer and the second conductive sheet 2. It is understood that the fusible layer can also be made of other conductive materials.

[0082] Preferably, the surface of the second conductive sheet 2 is plated with matte tin, i.e., a granular tin layer is formed on the surface of the second conductive sheet 2. Since the granular layer can increase the contact area, the matte tin plating can enhance the connection reliability between the second conductive sheet 2 and the first conductive sheet 13 and improve the conductivity of the second conductive sheet 2. In addition, matte tin has good corrosion resistance.

[0083] Optionally, the ratio of the depth h of the first groove 21 to the width w of the second conductive sheet 2 satisfies: 0.5≤h / w≤2. For example, the ratio h / w can be 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, etc.

[0084] The ratio of the depth h of the first groove 21 to the width w of the second conductive sheet 2 should be neither too large nor too small. If the ratio is too large (e.g., greater than 2), the probability of relative warping between the second conductive sheet 2 and the first conductive sheet 13 increases, making it difficult to ensure a large contact area between the second conductive sheet 2 and the first conductive sheet 13, and the weight and cost of the second conductive sheet 2 will increase accordingly. If the ratio is too small (e.g., less than 0.5), the contact area between the second conductive sheet 2 and the first conductive sheet 13 is small, and the connection reliability between the two is poor. Therefore, the ratio of the depth h of the first groove 21 to the width w of the second conductive sheet 2 should be selected within an appropriate range.

[0085] Optional, such as Figure 7 As shown, the thickness d of the conductive block 3 satisfies: 0.5 mm ≤ d2 ≤ 10 mm. For example, the thickness d of the conductive block 3 can be: 0.5 mm, 0.8 mm, 1.0 mm, 2.0 mm, 5.0 mm, 8.0 mm, 10.0 mm, etc.

[0086] In this embodiment, if Figure 7 As shown, the thickness d of the conductive block 3 should be neither too large nor too small. If the thickness d of the conductive block 3 is large (for example, greater than 10.0 mm), the conductive block 3 is heavy and the cost is high. If the thickness d of the conductive block 3 is small (for example, less than 0.5 mm), the conductive block 3 cannot effectively increase the cross-sectional area at the connection between the second conductive sheet 2 and the first conductive sheet 13, affecting the current transmission efficiency between the battery module 10. Therefore, the thickness d of the conductive block 3 should be selected within an appropriate range.

[0087] In a specific embodiment, a first through hole is provided on the second conductive sheet 2 , and a second through hole is provided on the first conductive sheet 13 . The connector 4 passes through the first through hole and the second through hole to fix the second conductive sheet 2 and the first conductive sheet 13 to the electrode base 14 .

[0088] like Figure 6 As shown, the second conductive sheet 2 and the first conductive sheet 13 can be securely fixed to the electrode base 14 via the connector 4, ensuring a reliable connection between the second conductive sheet 2 and the first conductive sheet 13. The connector 4 can be a fastener such as a screw, and the first through-hole and the second through-hole can be threaded holes. It is understood that the second conductive sheet 2, the first conductive sheet 13, and the electrode base 14 can also be connected by welding, clamping, or other methods.

[0089] Furthermore, when a conductive block 3 is provided between the first groove 21 and the first conductive sheet 13 , a through hole may also be provided on the conductive block 3 , thereby facilitating fixing the first conductive sheet 13 , the second conductive sheet 2 and the conductive block 3 to the electrode base 14 .

[0090] In a specific embodiment, Figure 11 and Figure 12 As shown, the first conductive sheet 13 is provided with a second groove 131 , and the first groove 21 is plugged into the second groove 131 .

[0091] In this embodiment, if Figure 11 and Figure 12 As shown, by providing the second groove 131, the contact area between the second conductive sheet 2 and the first conductive sheet 13 is further increased, the resistance of the path for current flowing between the battery modules 10 is reduced, the heat generated by the second conductive sheet 2 when current flows through the second conductive sheet 2 is reduced, and the current transmission efficiency between the battery modules 10 is improved.

[0092] Optionally, the upper arm of the first groove 21 extends into the second groove 131 , and the lower arm of the second groove 131 extends into the first groove 21 .

[0093] At this time, the conductive block 3 can be set at at least one position between the upper arm of the first groove 21 and the upper arm of the second groove 131, between the lower arm of the first groove 21 and the lower arm of the second groove 131, and between the upper arm of the first groove 21 and the lower wall of the second groove 131.

[0094] Optionally, the lower arm of the first groove 21 extends into the second groove 131 , and the upper arm of the second groove 131 extends into the first groove 21 .

[0095] At this time, the conductive block 3 can be set at at least one position between the upper arm of the first groove 21 and the upper arm of the second groove 131, between the lower arm of the first groove 21 and the lower arm of the second groove 131, and between the lower arm of the first groove 21 and the upper wall of the second groove 131.

[0096] By providing at least one conductive block 3, the cross-sectional area at the junction between the second conductive sheet 2 and the first conductive sheet 13 is increased, significantly reducing the resistance of the path through which current flows between the battery modules 10. This reduces the amount of heat generated when current flows through the junction between the second conductive sheet 2 and the first conductive sheet 13, thereby improving the efficiency of current transmission between the battery modules 10. By providing different numbers of conductive blocks 3, the cross-sectional area at the junction between the first conductive sheet 13 and the second conductive sheet 2 can be varied, allowing the number of conductive blocks 3 to be selected based on actual needs. The conductive blocks 3 may be copper or aluminum.

[0097] Further, such as Figure 13 and Figure 14 As shown, one of the first groove 21 and the second groove 131 is provided with a protrusion 22 , and the other is provided with a recess 132 , and the protrusion 22 cooperates with the recess 132 .

[0098] The cooperation between the raised portion 22 and the recessed portion 132 makes the connection between the second conductive sheet 2 and the first conductive sheet 13 tighter, with more contact points, thereby improving the reliability of the electrical connection between the two. At the same time, the cooperation between the raised portion 22 and the recessed portion 132 can also limit the relative movement of the second conductive sheet 2 and the first conductive sheet 13, making it difficult for the second conductive sheet 2 and the first conductive sheet 13 to separate from each other.

[0099] Specifically, such as Figure 13 As shown, when the second conductive sheet 2 is provided with the first groove 21 and the first conductive sheet 13 is not provided with the second groove 131, the protrusion 22 or the recessed portion 132 is provided on the surface of the upper arm of the first groove 21 facing the lower arm and the surface of the lower arm facing the upper arm, and on part of the upper surface and part of the lower surface of the first conductive sheet 13, so that the protrusion 22 and the recessed portion 132 can cooperate with each other.

[0100] Specifically, such as Figure 14 As shown, when the second conductive sheet 2 is provided with a first groove 21 and the first conductive sheet 13 is provided with a second groove 131, the protrusion 22 or the recessed portion 132 is provided on the upper surface and lower surface of the arm portion of the first groove 21 extending into the second groove 131, and the upper surface of the arm portion not extending into the second groove 131, and the recessed portion 132 or the protrusion 22 is provided on the upper surface and lower surface of the arm portion of the second groove 131 extending into the first groove 21, and the lower surface of the arm portion not extending into the first groove 21, so that the protrusion 22 and the recessed portion 132 can cooperate with each other.

[0101] More specifically, the raised portion 22 and the recessed portion 132 may be triangular or semicircular in shape. It is understood that the raised portion 22 and the recessed portion 132 may also be in other shapes, which are not limited in this application.

[0102] In another specific embodiment, Figure 15 and Figure 16 As shown, the first groove 21 and the second groove 131 are diamond-shaped, and the arm of the first groove 21 extending into the second groove 131 is provided with a second snap-fitting recess 23, and the arm of the second groove 131 extending into the first groove 21 is provided with a first snap-fitting recess 133, so that at least one installation space with a diamond-shaped cross-section is formed between the second conductive sheet 2 and the first conductive sheet 13, and the diamond-shaped conductive block 3 is installed in the installation space.

[0103] The upper arm and the lower arm of the first groove 21 are inclined relative to the first direction X, so that the first groove 21 is diamond-shaped; the upper arm and the lower arm of the second groove 131 are inclined relative to the first direction X, so that the second groove 131 is diamond-shaped.

[0104] In this embodiment, if Figure 15 and Figure 16 As shown, taking the example of the upper arm of the first groove 21 extending into the second groove 131 and the lower arm of the second groove 131 extending into the first groove 21, the second clamping recess 23 and the upper arm of the second groove 131 can limit the movement of the conductive block 3 located therebetween along the extension direction of the second conductive sheet 2 relative to the second conductive sheet 2, and can also limit the movement of the conductive block 3 along the extension direction of the first conductive sheet 13 relative to the first conductive sheet 13. Similarly, the first clamping recess 133 and the lower arm of the first groove 21, the upper arm of the first groove 21 and the lower arm of the second groove 131 can also play the same limiting role on the conductive block 3, so that the second conductive sheet 2, the first conductive sheet 13 and the conductive block 3 limit the relative movement of each other, thereby improving the connection reliability of the three.

[0105] Specifically, the first groove 21 and the second groove 131 may be matched first, and then the conductive block 3 may be inserted from the side into the installation space between the first conductive sheet 13 and the second conductive sheet 2 .

[0106] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery module, characterized in that: The battery module (10) comprises: A body (1), the body (1) is used to store electric energy, the body (1) comprising a first conductive sheet (13) and an electrode base (14); A second conductive sheet (2), one end of the second conductive sheet (2) being connected to the first conductive sheet (13) and fixed together to the electrode base (14), and the other end of the second conductive sheet (2) being used for connecting to an adjacent battery module (10); The second conductive sheet (2) is provided with a first groove (21), the first conductive sheet (13) can extend into the first groove (21), and a conductive block (3) is further provided between the first groove (21) and the first conductive sheet (13); Along the direction of going deeper into the first groove (21), the distance between the upper arm and the lower arm of the first groove (21) gradually increases; The first conductive sheet (13) is provided with a first clamping recess (133) so that an installation space with a diamond-shaped cross section is formed between the first conductive sheet (13) and the second conductive sheet (2), and the conductive block (3) is installed in the installation space.

2. The battery module according to claim 1, characterized in that: The surface of the second conductive sheet (2) has a fusible layer, and the fusible layer melts when the temperature reaches a preset temperature; The material of the fusible layer is tin or nickel, and the fusible layer is formed on the surface of the second conductive sheet (2) by electroplating.

3. The battery module according to claim 1, characterized in that: Observing along the thickness direction of the second conductive sheet (2), the conductive block (3) protrudes beyond the edge of the first groove (21).

4. The battery module according to claim 1, characterized in that: The conductive block (3) has a trapezoidal cross section, and the first conductive sheet (13) is provided with a first clamping recess (133), so that at least one installation space with a rhombus-shaped cross section is formed between the first conductive sheet (13) and the second conductive sheet (2), and the conductive block (3) is installed in the installation space.

5. The battery module according to claim 1, characterized in that: The thickness d of the conductive block (3) satisfies: 0.5 mm ≤ d2 ≤ 10 mm; And / or, the ratio of the depth h of the first groove (21) to the width w of the second conductive sheet (2) satisfies: 0.5≤h / w≤2.

6. The battery module according to any one of claims 1 to 5, characterized in that: The first conductive sheet (13) is provided with a second groove (131), and the first groove (21) is plugged into the second groove (131).

7. The battery module according to claim 6, characterized in that: The conductive block (3) is provided at least one between the upper arm of the first groove (21) and the upper arm of the second groove (131), between the lower arm of the first groove (21) and the lower arm of the second groove (131), and between the upper arm of the first groove (21) and the lower wall of the second groove (131).

8. The battery module according to claim 6, characterized in that: One of the first groove (21) and the second groove (131) is provided with a protruding portion (22), and the other is provided with a recessed portion (132), and the protruding portion (22) cooperates with the recessed portion (132).

9. The battery module according to claim 8, characterized in that: The protrusion (22) or the recess (132) is arranged on the upper surface and the lower surface of the arm portion of the first groove (21) extending into the second groove (131), and the upper surface of the arm portion not extending into the second groove (131); The recessed portion (132) or the raised portion (22) is arranged on the upper surface and the lower surface of the arm portion of the second groove (131) extending into the first groove (21), and the lower surface of the arm portion not extending into the first groove (21).

10. A battery pack, characterized in that: The battery pack comprises: a housing and a battery module (10) according to any one of claims 1 to 9, wherein the battery module (10) is installed in the housing.

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