A battery module and a battery pack

Abstract

The present application relates to a battery module and a battery pack, wherein the battery module comprises: a body and a second conductive sheet, wherein the body is used to store electric energy, and the body has a first conductive sheet and an electrode base; one end of the second conductive sheet is connected to the first conductive sheet and fixed to the electrode base together, 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. In the present application, by providing the first groove so that the first conductive sheet extends into the first groove, the contact area between the first conductive sheet and the second conductive sheet is increased, the resistance of the path through which the current flows between the battery modules is reduced, the heat generated by the second conductive sheet when the current flows through the second conductive sheet is reduced, and the transmission efficiency of the current between the battery modules is improved. By providing the conductive block between the first groove and the first conductive sheet, the cross-sectional area of ​​the connection between the second conductive sheet and the first conductive sheet is increased, and the resistance of the path through which the current flows between the battery modules is reduced again.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery module and a battery pack. Background Art

[0002] The energy storage battery pack is an indispensable energy storage component of the solar photovoltaic power generation system. Its main function is to store the electricity of the photovoltaic power generation system and supply power to the load when the sunshine is insufficient, at night and in emergency. The battery pack includes a box and a battery module installed in the box. Multiple battery modules are connected by conductive sheets. The conductive sheet is generally made of copper, so it is also called a copper plate.

[0003] 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

[0004] 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 relatively large and restricts the performance of the battery pack.

[0005] A battery module provided in an embodiment of the present application includes: a main body and a second conductive sheet, wherein the main body is used to store electric energy, and the main body has a first conductive sheet and an electrode base; one end of the second conductive sheet is connected to the first conductive sheet and fixed 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.

[0006] In a specific embodiment, the surface of the second conductive sheet has a fusible layer, 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 by electroplating.

[0007] In a specific embodiment, along the direction of going deeper into the first groove, the distance between the upper arm and the lower arm of the first groove gradually increases.

[0008] In a specific embodiment, 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.

[0009] In a specific implementation, the first conductive sheet is provided with a second groove, and the first groove is plugged into the second groove.

[0010] 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.

[0011] 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.

[0012] In a specific embodiment, the raised portion or the recessed portion is arranged on the upper surface and the 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 the 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.

[0013] In a specific embodiment, the first conductive sheet is provided with a first snap-fitting recess, and the second conductive sheet is provided with a second snap-fitting 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.

[0014] 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.

[0015] In the present application, by providing the first groove, the first conductive sheet is extended into the first groove, thereby increasing the contact area between the first conductive sheet and the second conductive sheet, thereby reducing the resistance of the path through which the current flows between the battery modules, reducing the heat generated by the second conductive sheet when the current flows through the second conductive sheet, and thereby improving the transmission efficiency of the current between the battery modules. Furthermore, by providing a conductive block between the first groove and the first conductive sheet, the cross-sectional area of ​​the connection between the second conductive sheet and the first conductive sheet is increased, and the resistance of the path through which the current flows between the battery modules is reduced again, reducing the heat generated by the second conductive sheet when the current flows through the second conductive sheet, and improving the transmission efficiency of the current between the battery modules.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery pack provided in the present application in a specific embodiment;

[0018] Figure 2 for Figure 1 Exploded view of the battery pack;

[0019] Figure 3 A schematic diagram of the structure of a battery module provided in the present application in a specific embodiment;

[0020] Figure 4 for Figure 3 A partial enlarged view of the middle A area;

[0021] Figure 5 A schematic structural diagram of a second conductive sheet provided in the present application in a specific embodiment;

[0022] Figure 6 It is a schematic diagram of the structure in which the second conductive sheet and the first conductive sheet are connected and fixed to the electrode base;

[0023] Figure 7 for Figure 6 A schematic diagram of a structure in which the second conductive sheet is connected to the first conductive sheet and a conductive block is arranged between the two;

[0024] Figure 8 for Figure 6 Another structural schematic diagram in which the second conductive sheet is connected to the first conductive sheet and a conductive block is arranged between the two;

[0025] Fig. 9 for Figure 6 Another structural schematic diagram in which the second conductive sheet is connected to the first conductive sheet and a conductive block is arranged between the two;

[0026] Fig.10 for Fig. 9 Exploded diagram of

[0027] Fig.11 is a structural schematic diagram of another structure of the first conductive sheet;

[0028] Fig.12 for Fig.11 A schematic diagram of the structure in which the first conductive sheet cooperates with the second conductive sheet;

[0029] Fig.13 for Figure 7 A schematic diagram of a structure in which a second conductive sheet and a first conductive sheet are provided with a protruding portion or a recessed portion;

[0030] Fig.14 for Fig.12 A schematic diagram of a structure in which a second conductive sheet and a first conductive sheet are provided with a protruding portion or a recessed portion;

[0031] Fig.15 for Fig.11 Another structural schematic diagram of the first conductive sheet and the second conductive sheet cooperating with each other;

[0032] Fig.16 for Fig.15 Exploded diagram.

[0033] Reference numerals:

[0034] 10-Battery module;

[0035] 20-upper cover;

[0036] 30-Liquid cooling plate;

[0037] 1-Ontology;

[0038] 11-battery cell;

[0039] 12-end plate;

[0040] 13- a first conductive sheet;

[0041] 131- second groove;

[0042] 132-depression;

[0043] 133-first clamping recess;

[0044] 14-electrode base;

[0045] 15-Steel belt;

[0046] 2- second conductive sheet;

[0047] 21- first groove;

[0048] 22- raised portion;

[0049] 23- second clamping recess;

[0050] 3-conductive block;

[0051] 4-Connectors.

[0052] 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

[0053] 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.

[0054] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0055] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" 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 other meanings.

[0056] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0057] 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 at 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 is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0058] 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: a shell and a battery module 10, and the battery module 10 is installed in the shell. Specifically, the shell is composed of an upper cover 20 and a liquid cooling plate 30, and there is a receiving cavity between the upper cover 20 and the liquid cooling plate 30, and multiple battery modules 10 are installed in the receiving cavity. The battery module 10 generates heat when working, and the liquid cooling plate 30 can cool the battery module 10 to keep it within a suitable temperature range to ensure the normal operation of the battery pack.

[0059] Figure 3 This is a schematic diagram of the structure 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 diagram of the structure of the second conductive sheet 2 provided in this application. Figure 6 FIG. 1 is a schematic diagram of a structure in which the second conductive sheet 2 and the first conductive sheet 13 are connected and fixed to the electrode base 14. Figure 3~Figure 6As shown, the battery module 10 includes: a main body 1 and a second conductive sheet 2, the main body 1 is used to store electric 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 is fixed to the electrode base 14 together, and the other end is used to connect with 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.

[0060] In this embodiment, if Figure 4~Figure 6 As shown, by setting 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 flowing between the battery modules 10, reducing the heat generated by the second conductive sheet 2 when the current flows through the second conductive sheet 2, and thereby improving the current transmission efficiency between the battery modules 10.

[0061] The extension direction of the second conductive sheet 2 is defined as the first direction X, the thickness direction of the second conductive sheet 2 is defined as the second direction Y, and the first direction X and the second direction Y may be perpendicular.

[0062] 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. By providing the conductive block 3, the cross-sectional area of ​​the connection between the second conductive sheet 2 and the first conductive sheet 13 is increased, and the resistance of the path for the current to flow between the battery modules 10 is reduced again, and the heat generated by the second conductive sheet 2 when the current flows through the second conductive sheet 2 is reduced, and the transmission efficiency of the current between the battery modules 10 is improved.

[0063] Optionally, one or two conductive blocks 3 are disposed between the first groove 21 and the first conductive sheet 13 .

[0064] 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.

[0065] In a specific embodiment, Figure 8 As shown, 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 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.

[0066] Further, such as Fig. 9and Fig.10 As shown, 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.

[0067] like Figure 6 and Fig.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.

[0068] It is understandable that the first clamping 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 clamping recess 133 is provided on both sides of the first conductive sheet 13 along the second direction Y.

[0069] 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.

[0070] Furthermore, Figure 6 As shown, the second conductive sheet 2 is fixed to the electrode base 14 together with the first conductive sheet 13 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 operation.

[0071] Specifically, 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 electric 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, which can protect the battery cells 11. The electrode base 14 can be installed on the end plates 12 by screw connection, clamping, welding and other connection methods. Two steel belts 15 bundle the battery cells 11, the fireproof layer and the end plates 12 to prevent the battery cells 11 from expanding during operation.

[0072] The fireproof layer includes mica sheets and insulating layers. Mica sheets have the advantages of good electrical properties, good heat resistance, stable chemical properties, and good mechanical properties. The raw materials of mica sheets are natural mineral products with low costs and will not cause environmental pollution during the production and processing. The materials of the insulating layer include but are not limited to polycarbonate (PC), ceramics, polyethylene (PP), nylon, etc.

[0073] In addition, the first conductive sheet 13 is disposed on the top of the battery cell 11, and is connected to the electrodes of the adjacent battery cells 11 to realize the electrical connection between the adjacent battery cells 11, thereby realizing the series connection of all the battery cells 11 in the battery module 10. Among them, 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, so it is often called "aluminum bar".

[0074] 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.

[0075] In this embodiment, by providing the fusible layer, 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 the second conductive sheet 2, and improves the transmission efficiency of the current between the battery modules 10.

[0076] Further, 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.

[0077] 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, and it is 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 is very easy to melt, affecting the working 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 can be understood that the value of the preset temperature can be adjusted according to actual conditions or experience.

[0078] Furthermore, the fluidity of the fusible layer after melting is poor, so that the melted fusible layer still adheres to the surface of the second conductive sheet 2 and does not drip from the second conductive sheet 2, thereby not affecting or damaging other structures of the battery pack. At the same time, after the temperature of the second conductive sheet 2 decreases, the melted fusible layer solidifies on the surface of the second conductive sheet 2, so that the cross-sectional area of ​​the second conductive sheet 2 is larger.

[0079] Specifically, 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. Since tin or nickel is soft, the material of the fusible layer is tin or nickel, so that the contact degree between the fusible layer and the second conductive sheet 2 is higher. It can be understood that the material of the fusible layer can also be selected from other conductive materials.

[0080] Preferably, matte tin is plated on the surface of the second conductive sheet 2, that is, a granular tin layer is formed on the surface of the second conductive sheet 2. Since the granular shape can increase the contact area, the matte tin plating can make the connection reliability between the second conductive sheet 2 and the first conductive sheet 13 higher, thereby improving the conductive performance of the second conductive sheet 2. In addition, matte tin has good corrosion resistance.

[0081] 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 may be 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, etc.

[0082] The ratio of the depth h of the first groove 21 to the width w of the second conductive sheet 2 should not be too large or too small. If the ratio is too large (for example, greater than 2), the probability of relative warping of the second conductive sheet 2 and the first conductive sheet 13 increases, and it is difficult to ensure that the second conductive sheet 2 and the first conductive sheet 13 have a large contact area, and the weight and cost of the second conductive sheet 2 will increase accordingly; if the ratio is too small (for example, 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.

[0083] 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 may specifically be: 0.5 mm, 0.8 mm, 1.0 mm, 2.0 mm, 5.0 mm, 8.0 mm, 10.0 mm, etc.

[0084] In this embodiment, if Figure 7As shown, the thickness d of the conductive block 3 should not be too large or too small. If the thickness d of the conductive block 3 is large (for example, greater than 10.0 mm), the weight of the conductive block 3 is large and the cost is high; if the thickness 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 of ​​the connection between the second conductive sheet 2 and the first conductive sheet 13, affecting the transmission efficiency of the current between the battery modules 10. Therefore, the thickness d of the conductive block 3 should be selected within an appropriate range.

[0085] In a specific embodiment, a first through hole is provided on the second conductive sheet 2 , a second through hole is provided on the first conductive sheet 13 , and 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 .

[0086] like Figure 6 As shown, the second conductive sheet 2 and the first conductive sheet 13 can be reliably fixed to the electrode base 14 through the connecting member 4, and the second conductive sheet 2 and the first conductive sheet 13 are reliably connected. The connecting member 4 can be a fastener such as a screw, and the first through hole and the second through hole can be threaded holes. It can be understood that the second conductive sheet 2, the first conductive sheet 13 and the electrode base 14 can also be connected by welding, clamping, etc.

[0087] Furthermore, when a conductive block 3 is disposed between the first groove 21 and the first conductive sheet 13 , a through hole may also be disposed on the conductive block 3 , so as to facilitate fixing the first conductive sheet 13 , the second conductive sheet 2 and the conductive block 3 to the electrode base 14 .

[0088] In a specific embodiment, Fig.11 and Fig.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 .

[0089] In this embodiment, if Fig.11 and Fig.12 As shown, by setting 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 the current flows through the second conductive sheet 2 is reduced, and the transmission efficiency of the current between the battery modules 10 is improved.

[0090] 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 .

[0091] 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.

[0092] 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 .

[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 lower arm of the first groove 21 and the upper wall of the second groove 131.

[0094] By providing at least one conductive block 3, the cross-sectional area of ​​the connection between the second conductive sheet 2 and the first conductive sheet 13 is increased, the resistance of the path for the current to flow between the battery modules 10 is reduced to a greater extent, the heat generated when the current flows through the connection between the second conductive sheet 2 and the first conductive sheet 13 is reduced, and the transmission efficiency of the current between the battery modules 10 is improved. By providing different numbers of conductive blocks 3, the cross-sectional area of ​​the connection between the first conductive sheet 13 and the second conductive sheet 2 can be changed, so the number of conductive blocks 3 can be selected according to actual needs. Among them, the conductive block 3 can be a copper block or an aluminum block.

[0095] Further, such as Fig.13 and Fig.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 .

[0096] The cooperation between the protrusion 22 and the recess 132 makes the connection between the second conductive sheet 2 and the first conductive sheet 13 tighter and the contact points more numerous, thereby making the reliability of the electrical connection between the two higher. At the same time, the cooperation between the protrusion 22 and the recess 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.

[0097] Specifically, Fig.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.

[0098] Specifically, Fig.14As 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 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, and the recessed portion 132 or the protrusion 22 is provided 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, so that the protrusion 22 and the recessed portion 132 can cooperate with each other.

[0099] More specifically, the protrusion 22 and the recess 132 may be in a triangular or semicircular shape. It is understandable that the protrusion 22 and the recess 132 may also be in other shapes, which are not limited in the present application.

[0100] In another specific embodiment, Fig.15 and Fig.16 As shown, the first groove 21 and the second groove 131 are in a rhombus shape, 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 rhombus-shaped cross-section is formed between the second conductive sheet 2 and the first conductive sheet 13, and the rhombus-shaped conductive block 3 is installed in the installation space.

[0101] 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 rhombus-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 rhombus-shaped.

[0102] In this embodiment, if Fig.15 and Fig.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 their relative movement, thereby improving the connection reliability of the three.

[0103] Specifically, the first groove 21 and the second groove 131 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.

[0104] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module, characterized in that: The battery module (10) comprises: A body (1), the body (1) being 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); The first conductive sheet (13) is provided with a second groove (131), the first groove (21) and the second groove (131) being plugged into each other; the conductive block (3) is provided at least one of 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); The upper arm and the lower arm of the first groove (21) are inclined relative to the first direction, the upper arm and the lower arm of the second groove (131) are inclined relative to the first direction, the arm portion of the second groove (131) extending into the first groove (21) is provided with a first clamping recess (133), and the arm portion of the first groove (21) extending into the second groove (131) is provided with a second clamping recess (23), so that at least one 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; The surface of the second conductive sheet (2) has a fusible layer, the fusible layer melts when the temperature reaches a preset temperature, and the fusible layer is formed on the surface of the second conductive sheet (2) by electroplating.

2. The battery module according to claim 1, characterized in that: The material of the fusible layer is tin or nickel.

3. The battery module according to claim 1, characterized in that: Along the direction going deeper into the first groove (21), the distance between the upper arm and the lower arm of the first groove (21) gradually increases.

4. The battery module according to claim 1, 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).

5. The battery module according to claim 4, characterized in that: The convex portion (22) or the concave portion (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).

6. 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 5, wherein the battery module (10) is installed in the housing.

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