Battery cover plate, battery and battery module

Abstract

The invention discloses a battery cover plate, a battery and a battery module. The battery cover plate comprises a cover plate body and a signal transmission connector, the signal transmission connector comprises a connector; the connector comprises a connecting base, and a pin hole, an elastic sheet limiting groove and a metal elastic sheet which are respectively arranged on the connecting base; one end of the pin hole is used for being connected with an input socket of a cell state monitoring sensor in an inserted mode, and the other end of the pin hole is used for being connected with an output socket of a battery management system in an inserted mode. The connecting base is made of insulating elastic plastic, the elongation of the connecting base ranges from 80% to 120%, the yield elongation of the connecting base ranges from 7% to 15%, the yield strength of the connecting base ranges from 20 MPa to 40 MPa, and the elastic modulus of the connecting base ranges from 1 GPa to 1.5 GPa. A mounting hole is formed in the cover plate body; and the connecting base is inserted into the mounting hole and seals the mounting hole. According to the signal transmission connector, the mechanical performance parameters of the insulating elastic plastic determine that the connecting base can generate elastic deformation during extrusion, so that the mounting hole is sealed, and the signal transmission connector can provide a stable signal transmission function on the premise of not influencing the sealing performance of the battery.

Description

Technical Field

[0001] The present invention relates to the field of lithium batteries, and in particular to a battery cover, a battery and a battery module. Background Art

[0002] Signal transmission connectors play a vital role in battery systems. They are responsible for transmitting the electrical energy or signals inside the battery to external devices or systems. Smart batteries usually need to monitor multiple battery properties, such as expansion force monitoring, temperature monitoring, internal resistance monitoring and voltage monitoring. Therefore, the battery cell needs to be electrically connected to the expansion force sensor, temperature sensor, internal resistance sensor and voltage sensor. During detection, it is necessary to connect the expansion force sensor, temperature sensor, internal resistance sensor and voltage sensor respectively through multiple signal transmission lines, and transmit the various detected electrical signals to the battery management system (BMS). The two ends of the existing signal transmission connector are open structures. Although it is convenient to install the signal transmission line, it will cause the battery's sealing performance to deteriorate. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Summary of the invention

[0003] The embodiments of the present invention provide a battery cover, a battery and a battery module to solve the problem that a signal transmission connector causes a decrease in battery sealing performance, thereby achieving the effect of taking both battery sealing performance and signal transmission performance into consideration.

[0004] Specifically, the present invention provides a battery cover, including a cover body and a signal transmission connector; The signal transmission connector comprises a connector; the connector comprises a connection base and a pin hole, a spring limit groove and a metal spring respectively arranged on the connection base; One end of the pin hole is used to be plugged into the input socket of the battery cell status monitoring sensor, and the other end is used to be plugged into the output socket of the battery management system; The opening side of the spring-type limiting groove faces the pin hole, and the metal spring is arranged in the spring-type limiting groove; a part of the metal spring extends into the pin hole and is used to abut against the pin of the input socket and the pin of the output socket to electrically connect the input socket and the output socket; The material of the connecting base is insulating elastic plastic; the insulating elastic plastic has an elongation of 80% to 120%, a yield elongation of 7% to 15%, a yield strength of 20MPa-40MPa, and an elastic modulus of 1GPa-1.5GPa; The cover plate body is provided with a mounting hole; the connecting base is inserted into the mounting hole and seals the mounting hole.

[0005] Optionally, the connector is made of polyphenylene sulfide.

[0006] Optionally, the connection base includes a first base and a second base; The pinholes include an input pinhole provided on the first base and an output pinhole provided on the second base; The spring piece limiting groove comprises a first limiting groove provided on the first base and a second limiting groove provided on the second base; The fixing portion of the metal spring is located between the first limiting groove and the second limiting groove; The pins of the input socket are input pins, and the pins of the output socket are output pins; the input pins are plugged into the input pin holes, and the output pins are plugged into the output pin holes.

[0007] Optionally, one of the first base and the second base is provided with a positioning pin, and the other is provided with a positioning hole, and the positioning pin and the positioning hole are plugged in a height direction of the battery cover; and / or, One of the first base and the second base is provided with a fixing strip, and the other is provided with a fixing groove, and the fixing strip is engaged with the fixing groove along the height direction of the battery cover; and / or, The first base and the second base are connected via a welding surface.

[0008] Optionally, a first flange edge is provided on the outer periphery of one end of the first base; A second flange is provided on the outer periphery of one end of the second base; The first flange edge and the second flange edge are connected to form an annular sealing portion; The metal spring is located inside the inner side of the annular sealing portion; A portion of the cover plate body wraps around the annular sealing portion.

[0009] Optionally, the cover plate body comprises a metal cover plate and a plastic bracket; the plastic bracket is arranged on the inner side of the metal cover plate; The metal cover plate is provided with a first mounting hole; the plastic bracket is provided with a second mounting hole; the connector is plugged into the first mounting hole and the second mounting hole, the hole wall of the first mounting hole wraps the annular sealing portion, and the annular sealing portion is in a compressed state.

[0010] Optionally, the metal cover plate is provided with a first mounting hole including a first hole segment, a second hole segment and a third hole segment; The cross-sectional area of ​​the second hole segment is larger than the cross-sectional area of ​​the first hole segment, and larger than the cross-sectional area of ​​the third hole segment; The connector is plugged into the first hole segment, the second hole segment and the third hole segment; the annular sealing portion is located in the second hole segment.

[0011] Optionally, the signal transmission connector further includes the input socket; The input socket comprises an input base and an input pin arranged on the input base; the input pin is used to connect the battery cell status monitoring sensor; The input pin is plugged into the pin hole, and the input pin and the pin hole are interference fit; the input pin is connected to the metal spring; The material of the input base is insulating plastic; the elongation of the input base is 10%-20%, the yield elongation is 2%-3%, the yield strength is 120MPa~160MPa, and the elastic modulus is greater than 12.6GPa.

[0012] Optionally, the signal transmission connector further includes the output socket; The output socket includes an output base and an output pin arranged on the output base; the output pin is used to connect the battery cell status monitoring sensor; The output pin is plugged into the pin hole, and the output pin and the pin hole are interference fit; the output pin is connected to the metal spring; The material of the output base is insulating plastic; the elongation of the output base is 10%-20%, the yield elongation is 2%-3%, the yield strength is 120MPa~160MPa, and the elastic modulus is greater than 12.6GPa.

[0013] Optionally, the input base and / or the output base is made of polyphenylene sulfide; Alternatively, the material of the input base and / or the output base includes polyphenylene sulfide and glass fiber, and the ratio of the glass fiber to the polyphenylene sulfide is (0.3~0.4):1.

[0014] Optionally, the input pin and / or the output pin are made of copper; The metal spring is made of red copper, phosphor bronze or beryllium copper.

[0015] The present invention further provides a battery, comprising a shell, a battery cell, a battery cell status monitoring sensor and a battery cover as described in any one of the above items, wherein the inner side of the cover body faces the shell; The battery cell is arranged in the shell, the battery cell state monitoring sensor is arranged on the battery cell, and the battery cover plate covers the shell; the battery cell state monitoring sensor is connected to the signal transmission connector through a signal line.

[0016] The present invention also provides a battery module, including a battery management system, and a plurality of batteries as described above, wherein the plurality of batteries are connected in series and / or in parallel; the battery management system is connected to the signal transmission connectors of each of the batteries via a signal line.

[0017] The beneficial effects of the present invention are: In the battery cover provided by the present invention, the mechanical performance parameters of the insulating elastic plastic determine that the connection base can maintain good structural integrity and shape stability when subjected to external force to avoid damage; and a certain elastic deformation will occur when squeezed, and a certain amount of rebound will occur after squeezing. Therefore, after the connection base is inserted into the mounting hole, the connection base is tightly abutted against the mounting hole due to the rebound effect, thereby sealing the mounting hole, so that the signal transmission connector can provide a stable signal transmission function without affecting the sealing performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0019] Figure 1 is a schematic structural diagram of a battery cover in one embodiment of the present invention; Figure 2 yes Figure 1 The schematic cross-sectional view at AA is a schematic structural diagram after rotating 90° counterclockwise; Figure 3 yes Figure 2 A schematic enlarged view of part B; Figure 4 yes Figure 2 A schematic partial enlarged view of part B; Figure 5 yes Figure 2 A schematic partial enlarged view of part B; Figure 6 is a schematic exploded view of a connection base in a battery cover according to an embodiment of the present invention; Figure 7 It is a schematic exploded view of a connection base in a battery cover according to an embodiment of the present invention.

[0020] In the figure: 100, cover body, 110, metal cover, 111, first mounting hole, 1111, first hole section, 1112, second hole section, 1113, third hole section, 120, plastic bracket, 121, second mounting hole, 200, transmission connector, 210, connection base, 211, first base, 212, second base, 220, pin hole, 221, input pin hole, 222, output pin hole, 230, spring Plate limiting groove, 231, first limiting groove, 232, second limiting groove, 240, metal spring, 250, annular sealing portion, 251, first flange edge, 252, second flange edge, 260, input socket, 261, input base, 262, input pin, 270, output socket, 271, output base, 272, output pin, 310, positioning pin, 320, positioning hole, 410, fixing strip, 420, fixing groove. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be glue injection inside two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Figure 1 is a schematic structural diagram of a battery cover in one embodiment of the present invention, such as Figure 1 As shown, and refer to Figures 2 to 7, an embodiment of the present invention provides a battery cover, including a cover body 100 and a signal transmission connector 200; the signal transmission connector 200 includes a connector; the connector includes a connection base 210 and a pin hole 220, a spring limit groove 230 and a metal spring 240 respectively arranged on the connection base 210; one end of the pin hole 220 is used to plug and connect to the input socket 260 of the battery cell status monitoring sensor, and the other end is used to plug and connect to the output socket 270 of the battery management system; the opening side of the spring limit groove 230 faces the pin hole 220, and the metal spring 240 is arranged on the spring limit The metal spring 240 partially extends into the pin hole 220 and is used to abut the pin of the input socket 260 and the pin of the output socket 270 to electrically connect the input socket 260 and the output socket 270; the connecting base 210 is made of insulating elastic plastic; the insulating elastic plastic has an elongation of 80% to 120%, a yield elongation of 7% to 15%, a yield strength of 20MPa-40MPa, and an elastic modulus of 1GPa-1.5GPa; a mounting hole is provided on the cover body 100; the connector is inserted into the mounting hole and seals the mounting hole.

[0025] In the embodiment of the present invention, the mechanical performance parameters of the insulating elastic plastic determine that the connection base 210 can maintain good structural integrity and shape stability when subjected to external forces to avoid damage; and a certain elastic deformation will occur when squeezed, and a certain amount of rebound will occur after squeezing. Therefore, after the connection base 210 is inserted into the mounting hole, the connection base 210 is tightly abutted against the mounting hole due to the rebound, thereby sealing the mounting hole, so that the signal transmission connector 200 can provide a stable signal transmission function without affecting the sealing performance of the battery; there is no need to set up an additional sealing structure for sealing the connector and the cover body, which simplifies the structure on the basis of ensuring the sealing performance of the battery, and reduces the volume of the signal transmission connector 200.

[0026] In one embodiment of the present invention, the connector is made of polyphenylene sulfide. Since polyphenylene sulfide has excellent chemical corrosion resistance, the prepared connector can resist electrolyte corrosion and improve its service life; at the same time, polyphenylene sulfide has high tensile strength, bending strength and elastic modulus, so as to seal the mounting hole after the connection base 210 is inserted into the mounting hole.

[0027] like Figures 2 to 4As shown, in one embodiment of the present invention, the connecting base 210 includes a first base 211 and a second base 212; the pin hole 220 includes an input pin hole 221 provided on the first base 211 and an output pin hole 222 provided on the second base 212; the spring limiting groove 230 includes the first limiting groove 231 provided on the first base 211 and the second limiting groove 232 provided on the second base 212; the fixed part of the metal spring 240 is limited between the first limiting groove 231 and the second limiting groove 232; the pin of the input socket 260 is the input pin 262, and the pin of the output socket 270 is the output pin 272; the input pin 262 is plugged into the input pin hole 221, and the output pin 272 is plugged into the output pin hole 222.

[0028] The connection base 210 of this embodiment adopts a split structure including a first base 211 and a second base 212, which is convenient for processing and assembly of the metal spring 240; the input pin hole 221 and the output pin hole 222 are respectively set on two independent first bases 211 and second bases 212, and the input pin 262 and the output pin 272 are respectively inserted into the corresponding pin holes 220 during assembly. The operation is simple and convenient, and the installation efficiency can be improved. As an electrical connection element, the metal spring 240 can provide good elastic contact, ensure a stable connection between the input pin 262 and the output pin 272, reduce contact resistance, and improve signal transmission efficiency. The first limit groove 231 and the second limit groove 232 fix the metal spring 240 to prevent it from moving when the input pin 262 or the output pin 272 is inserted.

[0029] like Figure 6 , Figure 7 As shown, in one embodiment of the present invention, one of the first base 211 and the second base 212 is provided with a positioning pin 310, and the other is provided with a positioning hole 320, and the positioning pin 310 and the positioning hole 320 are plugged in the height direction of the battery cover. In this embodiment, by providing the positioning pin 310 and the positioning hole 320, it is possible to ensure that the first base 211 and the second base 212 are accurately docked and welded, so that the first base and the second base are connected through the welding surface, thereby improving the accuracy of welding and improving the reliability of the connection between the first base 211 and the second base 212.

[0030] Furthermore, one of the first base 211 and the second base 212 is provided with a fixing strip 410, and the other is provided with a fixing groove 420, and the fixing strip 410 and the fixing groove 420 are clamped together along the height direction of the battery cover. By setting the fixing strip 410 and the fixing groove 420, it is possible to further ensure that the first base 211 and the second base 212 are accurately docked and welded, and the accuracy of welding is further improved, while improving the reliability of the connection between the first base 211 and the second base 212. Furthermore, the first base 211 and the second base 212 are connected through a welding surface. After the first base 211 and the second base 212 are welded by ultrasonic welding, the welding surface (i.e., the welding surface) has high mechanical strength and good sealing, which can ensure the sealing reliability of the connection base 210 during the use of the battery.

[0031] like Figure 2 , Figure 3 As shown, in one embodiment of the present invention, a first flange 251 is provided on the periphery of one end of the first base 211; a second flange 252 is provided on the periphery of one end of the second base 212; the first flange 251 and the second flange 252 are connected to form an annular sealing portion 250; the metal spring 240 is located inside the inner side of the annular sealing portion 250; and a part of the cover body 100 wraps the annular sealing portion 250. In this embodiment, the annular sealing portion 250 formed by connecting the first sealing portion and the second sealing portion can not only effectively prevent external factors such as dust and moisture from entering the interior of the connection base 210, protect the internal circuit from damage, and improve the safety of signal transmission, but also prevent leakage at the connection between the metal cover 110 and the connection base 210.

[0032] like Figure 5 As shown, in one embodiment of the present invention, the cover body 100 includes a metal cover 110 and a plastic bracket 120; the plastic bracket 120 is arranged on the inner side of the metal cover 110; the metal cover 110 is provided with a first mounting hole 111; the plastic bracket 120 is provided with a second mounting hole 121; the connector is plugged into the first mounting hole 111 and the second mounting hole 121, and the hole wall of the first mounting hole 111 wraps the annular sealing part 250, and the annular sealing part 250 is in a compressed state. The hole wall of the first mounting hole 111 on the cover body 100 wraps the annular sealing part 250, and the annular sealing part 250 is in a compressed state, which has better sealing performance; the mounting holes provided on the cover body 100 include the first mounting hole 111 and the second mounting hole 121. The provision of the plastic bracket 120 can not only stably support the metal cover plate 110 to make the metal cover plate 110 more stable and firm, but also prevent the conductive sheet from directly contacting the cover plate or the housing, thereby avoiding short circuit or leakage.

[0033] In one embodiment of the present invention, the first mounting hole 111 includes a first hole section 1111, a second hole section 1112 and a third hole section 1113; the cross-sectional area of ​​the second hole section 1112 is larger than the cross-sectional area of ​​the first hole section 1111, and larger than the cross-sectional area of ​​the third hole section 1113; the connector is plugged into the first hole section 1111, the second hole section 1112 and the third hole section 1113; the annular sealing portion 250 is located in the second hole section 1112. Since the cross-sectional area of ​​the second hole segment 1112 is larger than the cross-sectional area of ​​the first hole segment 1111 and larger than the cross-sectional area of ​​the third hole segment 1113, the annular sealing portion 250 is located in the second hole segment 1112, and the annular sealing portion 250 is limited by the step formed between the second hole segment 1112 and the first hole segment 1111 and the step formed between the second hole segment 1112 and the third hole segment 1113, and the annular sealing portion 250 is fixed on the metal cover plate 110, thereby preventing the connector from falling off the metal cover plate 110.

[0034] In one embodiment of the present invention, the signal transmission connector 200 also includes the input socket 260; the input socket 260 includes an input base 261, and an input pin 262 provided on the input base 261; the input pin 262 is used to connect the battery cell status monitoring sensor; the input pin 262 is plugged into the pin hole 220, and the input pin 262 and the pin hole 220 have an interference fit; the input pin 262 is connected to the metal spring 240; the material of the input base 261 is insulating plastic; the elongation of the input base 261 is 10%-20%, the yield elongation is 2%-3%, the yield strength is 120MPa~160MPa, and the elastic modulus is greater than 12.6GPa.

[0035] In the embodiment of the present invention, the mechanical performance parameters of the insulating plastic determine that the input base 261 has high strength and toughness, and even if subjected to a large extrusion force, it can maintain the stability and integrity of its structure and is not prone to excessive deformation or damage. Therefore, the insulating plastic can be used to prepare an input base 261 with high dimensional accuracy and stable shape to ensure that it is not easily deformed during use.

[0036] Similarly, the signal transmission connector 200 also includes the output socket 270; the output socket 270 includes an output base 271 and an output pin 272 provided on the output base 271; the output pin 272 is used to connect the battery cell status monitoring sensor; the output pin 272 is plugged into the pin hole 220, and the output pin 272 and the pin hole 220 are interference fit; the output pin 272 is connected to the metal spring 240; the material of the output base 271 is insulating plastic; the elongation of the output base 271 is 10%-20%, the yield elongation is 2%-3%, the yield strength is 120MPa~160MPa, and the elastic modulus is greater than 12.6GPa. Since the mechanical performance parameters of the output base 271 are the same as those of the input base 261, the output base 271 also has the characteristic of not being easily deformed, so as to ensure that it is not easily deformed during use.

[0037] In one embodiment of the present invention, the input base 261 and / or the output base 271 are made of polyphenylene sulfide.

[0038] In an alternative embodiment of the present invention, the input base 261 and / or the output base 271 are made of polyphenylene sulfide and glass fiber, and the ratio of the glass fiber to the polyphenylene sulfide is (0.3-0.4): 1. Glass fiber has high strength and modulus, and after being compounded with polyphenylene sulfide, the tensile strength, bending strength and elastic modulus of the material can be significantly improved, so as to ensure that the prepared input base 261 and the output base 271 have high strength and toughness.

[0039] In one embodiment of the present invention, the input pin 262 and / or the output pin 272 are made of copper; copper has excellent electrical conductivity, so the prepared pin has excellent electrical conductivity. The metal spring 240 is made of copper, phosphor bronze or beryllium copper. Phosphor bronze or beryllium copper has a high elastic limit and good electrical conductivity, so it can undergo a large elastic deformation under the premise of satisfying the electrical conductivity, so that the input pin 262 and / or the output pin 272 are deformed when in contact with the metal spring 240, thereby improving the stability of the abutment.

[0040] The embodiment of the present invention further provides a battery, comprising a housing, a battery cell, a battery cell state monitoring sensor and a battery cover as in any of the above embodiments, so as to have all the effects of the battery cover; the inner side of the battery cover faces the housing. The battery cell is arranged in the housing, the battery cell state monitoring sensor is arranged on the battery cell, and the battery cover covers the housing; the battery cell state monitoring sensor is connected to the signal transmission connector 200 via a signal line.

[0041] Preferably, the temperature rise, expansion force, voltage and internal resistance change of the battery cell during operation are collected by the corresponding sensors, and each sensor transmits the collected information to the battery management system of the battery module through the signal transmission connector 200, so as to realize monitoring and control of the entire battery life cycle.

[0042] An embodiment of the present invention also provides a battery module, including a battery management system, and multiple batteries as in the above embodiments, wherein the multiple batteries are connected in series and / or in parallel; the battery management system is connected to the signal transmission connector 200 of each battery through a signal line to realize monitoring and control of the entire battery life cycle.

[0043] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A battery cover, comprising a cover body (100), characterized in that: Also included is a signal transmission connector (200); The signal transmission connector (200) comprises a connector; the connector comprises a connection base (210) and a pin hole (220), a spring limiting groove (230) and a metal spring (240) respectively provided on the connection base (210); One end of the pinhole (220) is used for plugging into an input socket (260) connected to a cell state monitoring sensor, and the other end is used for plugging into an output socket (270) connected to a battery management system; The opening side of the shrapnel limiting groove (230) faces the pin hole (220), and the metal shrapnel (240) is arranged in the shrapnel limiting groove (230); a portion of the metal shrapnel (240) extends into the pin hole (220) and is used to abut against the pin of the input socket (260) and the pin of the output socket (270) to electrically connect the input socket (260) and the output socket (270); The material of the connection base (210) is insulating elastic plastic; the insulating elastic plastic has an elongation of 80% to 120%, a yield elongation of 7% to 15%, a yield strength of 20 MPa to 40 MPa, and an elastic modulus of 1 GPa to 1.5 GPa; A mounting hole is provided on the cover plate body (100); the connection base (210) is inserted into the mounting hole and seals the mounting hole.

2. The cover plate according to claim 1, wherein: The connector is made of polyphenylene sulfide.

3. The cover plate according to claim 1, wherein: The connecting base (210) comprises a first base (211) and a second base (212); The pinhole (220) comprises an input pinhole (221) provided on the first base (211) and an output pinhole (222) provided on the second base (212); The spring piece limiting groove (230) comprises a first limiting groove (231) provided on the first base (211) and a second limiting groove (232) provided on the second base (212); The fixing portion of the metal spring (240) is located between the first limiting groove (231) and the second limiting groove (232); The pin of the input socket (260) is an input pin (262), and the pin of the output socket (270) is an output pin (272); the input pin (262) is plugged into the input pin hole (221), and the output pin (272) is plugged into the output pin hole (222).

4. The cover plate according to claim 3, wherein: One of the first base (211) and the second base (212) is provided with a positioning pin (310), and the other is provided with a positioning hole (320), the positioning pin (310) and the positioning hole (320) being plugged into each other along the height direction of the battery cover; and / or, One of the first base (211) and the second base (212) is provided with a fixing strip (410), and the other is provided with a fixing groove (420), the fixing strip (410) and the fixing groove (420) being engaged with each other along the height direction of the battery cover; and / or, The first base (211) and the second base (212) are connected via a welding surface.

5. The cover plate according to claim 3, characterized in that: A first flange edge (251) is provided on the outer periphery of one end of the first base (211); A second flange edge (252) is provided on the outer periphery of one end of the second base (212); The first flange edge (251) and the second flange edge (252) are connected to form an annular sealing portion (250); The metal spring (240) is located inside the inner side of the annular sealing portion (250); A portion of the cover plate body (100) wraps around the annular sealing portion (250).

6. The cover plate according to claim 5, characterized in that: The cover plate body (100) comprises a metal cover plate (110) and a plastic bracket (120); the plastic bracket (120) is arranged on the inner side of the metal cover plate (110); The metal cover plate (110) is provided with a first mounting hole (111); the plastic bracket (120) is provided with a second mounting hole (121); the connector is plugged into the first mounting hole (111) and the second mounting hole (121), the hole wall of the first mounting hole (111) wraps the annular sealing portion (250), and the annular sealing portion (250) is in a compressed state.

7. The cover plate according to claim 6, characterized in that: The first mounting hole (111) comprises a first hole section (1111), a second hole section (1112) and a third hole section (1113); The cross-sectional area of ​​the second hole segment (1112) is greater than the cross-sectional area of ​​the first hole segment (1111), and greater than the cross-sectional area of ​​the third hole segment (1113); The connector is plugged into the first hole section (1111), the second hole section (1112), and the third hole section (1113); and the annular sealing portion (250) is located in the second hole section (1112).

8. The cover plate according to any one of claims 1 to 7, characterized in that: The signal transmission connector (200) further comprises the input socket (260); The input socket (260) comprises an input base (261) and an input pin (262) provided on the input base (261); the input pin (262) is used to connect to the battery cell status monitoring sensor; The input pin (262) is plugged into the pin hole (220), and the input pin (262) and the pin hole (220) are interference-fitted; the input pin (262) is connected to the metal spring (240); The material of the input base (261) is insulating plastic; the elongation of the input base (261) is 10%-20%, the yield elongation is 2%-3%, the yield strength is 120MPa-160MPa, and the elastic modulus is greater than 12.6GPa.

9. The cover plate according to claim 8, characterized in that: The signal transmission connector (200) further includes the output socket (270); The output socket (270) comprises an output base (271) and an output pin (272) provided on the output base (271); the output pin (272) is used to connect to the battery cell status monitoring sensor; The output pin (272) is plugged into the pin hole (220), and the output pin (272) and the pin hole (220) are interference-fitted; the output pin (272) is connected to the metal spring (240); The material of the output base (271) is insulating plastic; the elongation of the output base (271) is 10%-20%, the yield elongation is 2%-3%, the yield strength is 120MPa-160MPa, and the elastic modulus is greater than 12.6GPa.

10. The cover plate according to claim 9, characterized in that: The material of the input base (261) and / or the output base (271) is polyphenylene sulfide; Alternatively, the material of the input base (261) and / or the output base (271) includes polyphenylene sulfide and glass fiber, and the ratio of the glass fiber to the polyphenylene sulfide is (0.3-0.4):

1.

11. The cover plate according to claim 1, wherein: The input pin (262) and / or the output pin (272) are made of copper; The metal shrapnel (240) is made of red copper, phosphor bronze or beryllium copper.

12. A battery, characterized in that: comprising a housing, a battery cell, a battery cell status monitoring sensor, and a battery cover according to any one of claims 1 to 11, wherein the inner side of the battery cover faces the housing; The battery cell is arranged in a shell, the battery cell state monitoring sensor is arranged on the battery cell, and the battery cover covers the shell; the battery cell state monitoring sensor is connected to the signal transmission connector (200) via a signal line.

13. A battery module, characterized in that: It comprises a battery management system, and a plurality of batteries as claimed in claim 12, wherein the plurality of batteries are connected in series and / or in parallel; the battery management system is connected to the signal transmission connector (200) of each battery via a signal line.

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