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CN-121484268-B - Single battery and battery pack

CN121484268BCN 121484268 BCN121484268 BCN 121484268BCN-121484268-B

Abstract

The invention discloses a single battery and a battery pack, wherein the single battery comprises a shell, a top cover assembly and an acquisition module, the shell is provided with a containing cavity, the battery is arranged in the containing cavity, the top cover assembly comprises a top cover, the top cover is arranged on the shell and seals the containing cavity, the top cover is provided with an opening, the acquisition module comprises a first electrode piece, a second electrode piece and an acquisition plate, the first electrode piece covers the opening and can deform along with the change of air pressure in the containing cavity, the second electrode piece and the first electrode piece are oppositely arranged in the thickness direction of the top cover, the acquisition plate is arranged on one surface of the top cover opposite to the containing cavity, and the acquisition plate is respectively electrically connected with the first electrode piece and the second electrode piece. The single battery can accurately capture the tiny change of the internal air pressure of the battery, realize the high-precision real-time monitoring of the health state and the safety risk of the battery, and meet the strict monitoring requirement of the power battery.

Inventors

  • LEI JINGJING
  • LIANG JIWANG
  • LIN JINYI
  • HUANG DENGGAO

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260105

Claims (10)

  1. 1. A single cell, characterized by comprising: A housing (100), the housing (100) having a receiving cavity (110); the battery cell is arranged in the accommodating cavity (110); The top cover assembly (200), the top cover assembly (200) comprises a top cover (210), the top cover (210) is covered on the shell (100) and seals the accommodating cavity (110), and the top cover (210) is provided with an opening (211); The collecting module (300) comprises a first electrode piece (310), a second electrode piece (320) and a collecting plate (330), wherein the first electrode piece (310) is covered on the opening (211) and deforms along with the change of air pressure in the accommodating cavity (110), the second electrode piece (320) and the first electrode piece (310) are arranged opposite to each other along the thickness direction of the top cover (210), the collecting plate (330) is arranged on one surface of the top cover (210) opposite to the accommodating cavity (110), the collecting plate (330) is electrically connected with the first electrode piece (310) and the second electrode piece (320) respectively, the collecting plate (330) covers the opening (211), and the second electrode piece (320) is arranged on one surface of the collecting plate (330) opposite to the opening (211); The opening (211) is an explosion-proof opening, and the first electrode part (310) is an explosion-proof valve arranged at the explosion-proof opening; The collecting plate (330) is divided into a cracking plate area (331) opposite to the explosion-proof valve; The second electrode piece (320) is arranged in the split plate area (331) and falls off from the collecting plate (330) along with the split plate area (331).
  2. 2. The unit cell according to claim 1, wherein the first electrode member (310) is disposed on a surface of the top cover (210) facing the accommodating chamber (110), and the first electrode member (310) covers an end of the opening (211) facing the accommodating chamber (110); The second electrode piece (320) is positioned at one end of the opening (211) facing away from the accommodating cavity (110).
  3. 3. The cell of claim 2, wherein the acquisition module (300) further comprises a dielectric (340), the dielectric (340) being disposed between the first electrode member (310) and the second electrode member (320).
  4. 4. The unit cell according to claim 2, wherein the first electrode member (310) includes a convex portion (311) and a burring portion (312) provided at a peripheral edge of the convex portion (311); The flanging part (312) is connected to the outer edge of one end of the opening (211) facing the accommodating cavity (110), and the convex part (311) is accommodated in the opening (211) and is arranged opposite to the second electrode part (320).
  5. 5. The single battery according to claim 1, wherein the collecting plate (330) is provided with a plurality of cutting grooves (332) along the contour edge of the split plate area (331), and a connection point (333) for connecting the split plate area (331) with the peripheral area thereof is formed between any two adjacent cutting grooves (332).
  6. 6. The unit cell according to any one of claims 1 to 5, wherein the first electrode member (310) is electrically connected to the top cover (210), and the collecting plate (330) is electrically connected to the top cover (210) by being electrically connected thereto.
  7. 7. The unit cell according to any one of claims 1 to 5, wherein the cap assembly (200) further comprises a positive electrode post (220) and a negative electrode post (230), the positive electrode post (220) and the negative electrode post (230) being provided penetrating the cap (210) and being arranged at intervals; the collection plate (330) is electrically connected with the positive electrode pole (220) and the negative electrode pole (230) respectively, and is used for detecting voltage and/or current.
  8. 8. The unit cell according to any one of claims 1 to 5, wherein a mounting groove (212) is provided on a surface of the top cover (210) facing away from the accommodating chamber (110), and the opening (211) penetrates the top cover (210) from a groove bottom wall of the mounting groove (212); wherein, collection board (330) holding is in mounting groove (212).
  9. 9. The unit cell of claim 8, wherein the collection module (300) further comprises a bracket (350), the bracket (350) is fixed to the mounting groove (212), and the collection plate (330) is mounted to the bracket (350).
  10. 10. A battery pack, comprising: A case; The battery management system is arranged on the box body; A plurality of single cells according to any one of claims 1 to 9, arranged in the box, and the acquisition module (300) of the single cells is in communication connection with the battery management system.

Description

Single battery and battery pack Technical Field The invention relates to the technical field of power batteries, in particular to a single battery and a battery pack. Background In recent years, with the vigorous development of new energy automobiles, higher requirements are put on the monitoring of power batteries. In a conventional BMS (Battery MANAGEMENT SYSTEM ), a cable is used to transmit information collected by a Battery, so that the cables are arranged between the batteries and between the Battery and a control device, which results in heavy load of a vehicle and influences the driving mileage of the vehicle. Therefore, the wireless BMS replaces a physical cable through the wireless communication module, reduces the quality of the whole vehicle, improves the energy density, simultaneously remarkably simplifies the system architecture and reduces the production cost, and becomes an important direction for promoting the technical innovation of new energy automobiles. In relevant wireless BMS framework, for the later maintenance or change of being convenient for, data acquisition module installs in the battery is outside generally, probably unable direct perception battery inside atmospheric pressure's tiny fluctuation, has response delay, is difficult to satisfy high accuracy monitoring demand. Disclosure of Invention The invention mainly aims to provide a single battery, and aims to solve the technical problem that an acquisition module in the existing battery wireless BMS architecture is arranged outside a battery and is difficult to realize high-precision monitoring of the internal state of the battery. In order to achieve the above object, the present invention provides a single battery including: A housing having a receiving cavity; the battery cell is arranged in the accommodating cavity; The top cover assembly comprises a top cover, the top cover is covered on the shell and seals the accommodating cavity, and the top cover is provided with an opening; The collecting module comprises a first electrode piece, a second electrode piece and a collecting plate, wherein the first electrode piece is covered on the opening and can deform along with the change of air pressure in the accommodating cavity, the second electrode piece and the first electrode piece are arranged opposite to each other along the thickness direction of the top cover, the collecting plate is arranged on one surface of the top cover, which is opposite to the accommodating cavity, and the collecting plate is respectively and electrically connected with the first electrode piece and the second electrode piece. Optionally, the collecting plate covers the opening, and the second electrode member is disposed on a surface of the collecting plate facing the opening. Optionally, the first electrode is disposed on a surface of the top cover facing the accommodating cavity, and the first electrode covers one end of the opening facing the accommodating cavity; the second electrode piece is located at one end of the opening, which is opposite to the accommodating cavity. Optionally, the acquisition module further comprises a dielectric, and the dielectric is arranged between the first electrode piece and the second electrode piece. Optionally, the first electrode piece includes a convex portion and a flange portion disposed at a periphery of the convex portion; The flanging part is connected to the outer edge of one end of the opening, which faces the accommodating cavity, and the convex part is accommodated in the opening and is arranged opposite to the second electrode part. Optionally, the opening is an explosion-proof opening, and the first electrode member is an explosion-proof valve installed at the explosion-proof opening. Optionally, the collecting plate is divided into a cracking plate area opposite to the explosion-proof valve; The second electrode piece is arranged in the split plate area and can fall off from the collecting plate along with the split plate area. Optionally, the collecting plate is provided with a plurality of sections of cutting grooves along the contour edge of the splitting plate area, and a connecting point for connecting the splitting plate area with the peripheral area is formed between any two adjacent sections of cutting grooves. Optionally, the first electrode member is electrically connected with the top cover, and the collecting plate is electrically connected with the top cover. Optionally, the top cover assembly further comprises a positive electrode post and a negative electrode post, and the positive electrode post and the negative electrode post penetrate through the top cover and are arranged at intervals; the acquisition board is respectively and electrically connected with the positive electrode post and the negative electrode post and used for detecting voltage and/or current. Optionally, a mounting groove is formed in one surface of the top cover, which faces away from the accommodating cavity