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EP-4738588-A2 - CELL AND ELECTRONIC DEVICE HAVING SAME

EP4738588A2EP 4738588 A2EP4738588 A2EP 4738588A2EP-4738588-A2

Abstract

A battery cell, including an electrode assembly and a packaging bag, where the electrode assembly includes a tab, the packaging bag is configured to accommodate the electrode assembly, a sealing zone is formed on a periphery of the packaging bag, one end of the tab is electrically connected to a body of the electrode assembly, and the other end of the tab protrudes out of the sealing zone; the sealing zone is provided with a weak zone, and in a predetermined temperature range, a packaging tension of the weak zone in the packaging bag reduces to release gas inside the battery cell to the outside of the battery cell. This application further discloses an electronic apparatus, including a battery, where the battery includes a battery cell and a housing accommodating the battery cell, and the battery cell includes the foregoing battery cell.

Inventors

  • SONG, CHUANTAO
  • LI, RUI
  • NAN, HAIYANG
  • SU, Yisong

Assignees

  • Ningde Amperex Technology Limited

Dates

Publication Date
20260506
Application Date
20200330

Claims (10)

  1. A battery cell (100), comprising: an electrode assembly (10) comprising a tab (12); and a packaging bag (20) configured to accommodate the electrode assembly (10), wherein a sealing zone (30) is formed on a periphery of the packaging bag (20), one end of the tab (12) is electrically connected to a body (11) of the electrode assembly (10), and an other end of the tab (12) protrudes out of the sealing zone (30); the sealing zone (30) is provided with a weak zone (32); and in a predetermined temperature range, a packaging tension between the weak zone (32) and the packaging bag (20) reduces to release gas inside the battery cell (100) to the outside of the battery cell (100), characterized in that , the battery cell (100) comprises a first sealing adhesive (321) and a second sealing adhesive (322), the first sealing adhesive (321) is provided between the tab (12) and a first side of the packaging bag (20), the second sealing adhesive (322) is provided between the tab (12) and a second side of the packaging bag (20), the first side of the packaging bag (20) and the second side of the packaging bag (20) are opposite to each other, the tab (12) is provided between the first sealing adhesive (321) and the second sealing adhesive (322); the first sealing adhesive (321), the second sealing adhesive (322), and the packaging bag (20) are thermally fused to form the weak zone (32).
  2. The battery cell (100) according to claim 1, characterized in that , the packaging tension is defined as F N/6mm and temperature as T °C, and the F and T in the weak zone (32) satisfy the following relation: F = (0.5-f)T/20 + 6.5f - 2.75, wherein 110 ≤ T ≤ 130 and 4.5 ≤ f ≤ 5.5.
  3. The battery cell (100) according to claim 1 or 2, characterized in that , a thickness of the first sealing adhesive (321) or the second sealing adhesive (322) is greater than 25 µm.
  4. The battery cell (100) according to any one of claims 1 to 3, characterized in that , the first sealing adhesive (321) comprises a first adhesive layer (3211) and a second adhesive layer (3212), wherein the first adhesive layer (3211) is provided between the second adhesive layer (3212) and the packaging bag (20), the second adhesive layer (3212) is provided between the first adhesive layer (3211) and the tab (12); and in the predetermined temperature range, a packaging tension between the first adhesive layer (3211) and the packaging bag (20) or the second adhesive layer (3212) is less than a packaging tension between the second adhesive layer (3212) and the tab (12).
  5. The battery cell (100) according to any one of claims 1 to 3, characterized in that , the first sealing adhesive (321) comprises a first adhesive layer (3211) and a second adhesive layer (3212); wherein the first adhesive layer (3211) is provided between the second adhesive layer (3212) and the tab (12), the second adhesive layer (3212) is provided between the first adhesive layer (3211) and the packaging bag (20); and in the predetermined temperature range, a packaging tension between the first adhesive layer (3211) and the tab (12) or the second adhesive layer (3212) is less than a packaging tension between the second adhesive layer (3212) and the packaging bag (20).
  6. The battery cell (100) according to claim 4 or 5, characterized in that , a total thickness of the first adhesive layer (3211) and the second adhesive layer (3212) is greater than or equal to 25 µm and less than or equal to 100 µm, and a thickness of the first adhesive layer (3211) or the second adhesive layer (3212) is greater than 10 µm.
  7. The battery cell (100) according to any one of claims 1 to 3, characterized in that , the first sealing adhesive (321) comprises a first adhesive layer (3211), a second adhesive layer (3212), and a third adhesive layer (3213) that are arranged in sequence; wherein the first adhesive layer (3211) is provided between the second adhesive layer (3212) and the packaging bag (20), the third adhesive layer (3213) is provided between the second adhesive layer (3212) and the tab (12); and in the predetermined temperature range, a packaging tension between the first adhesive layer (3211) and the packaging bag (20) is less than a packaging tension between the second adhesive layer (3212) and the first adhesive layer (3211) or the third adhesive layer (3213), and a packaging tension between the third adhesive layer (3213) and the tab (12) is less than a packaging tension between the second adhesive layer (3212) and the first adhesive layer (3211) or the third adhesive layer (3213).
  8. The battery cell (100) according to claim 7, characterized in that , a total thickness of the first adhesive layer (3211), the second adhesive layer (3212), and the third adhesive layer (3213) is greater than or equal to 25 µm and less than or equal to 100 µm; and a thickness of the first adhesive layer (3211), the second adhesive layer (3212), or the third adhesive layer (3213) is greater than 10 µm.
  9. The battery cell (100) according to claim 1, characterized in that , the second sealing adhesive (322) comprises a fourth adhesive layer, a fifth adhesive layer, and a sixth adhesive layer that are arranged in sequence; the fourth adhesive layer is provided between the fifth adhesive layer and the packaging bag (20), the sixth adhesive layer is provided between the fifth adhesive layer and the tab (12); and in the predetermined temperature range, a packaging tension between the fourth adhesive layer and the packaging bag (20) is less than a packaging tension between the fifth adhesive layer and the fourth adhesive layer or the sixth adhesive layer, and a packaging tension between the sixth adhesive layer and the tab (12) is less than a packaging tension between the fifth adhesive layer and the fourth adhesive layer or the sixth adhesive layer.
  10. An electronic apparatus, comprising a battery, wherein the battery comprises a battery cell (100) and a housing accommodating the battery cell (100), characterized in that the battery cell (100) comprises the battery cell (100) according to any one of claims 1 to 9.

Description

TECHNICAL FIELD This application relates to the battery field, and in particular, to a battery cell and an electronic apparatus having such battery cell. BACKGROUND Currently, most electronic apparatuses on the market have built-in batteries to power them, and battery cells used by the market now all use a packaging bag to accommodate an electrode assembly. As the voltage and energy density of battery cells gradually increase, thermal stability of the battery cells gradually declines, with failures found in safety tests, indicating possible safety issues with the battery cells during use of electronic apparatuses by consumers, causing certain hazards. SUMMARY In view of the foregoing situation, it is necessary to provide a battery cell and an electronic apparatus having such battery cell, in order to mitigate safety issues with battery cells. Embodiments of this application provide a battery cell, including an electrode assembly and a packaging bag configured to accommodate the electrode assembly, where the electrode assembly includes a tab; a sealing zone is formed on a periphery of the packaging bag, one end of the tab is electrically connected to a body of the electrode assembly, and the other end of the tab protrudes out of the sealing zone; the sealing zone is provided with a weak zone, and in a predetermined temperature range, a packaging tension between the weak zone and the packaging bag reduces to release gas inside the battery cell to the outside of the battery cell. According to some embodiments of this application, the packaging tension is defined as F N/6mm and temperature as T °C, and F and T in the weak zone satisfy the following relation: F=(0.5-f)×T/20+6.5×f-2.75. Parameters in this relation are calculated numerically, where 110≤T≤130 and 4.5≤f≤5.5. According to some embodiments of this application, the battery cell includes a first sealing adhesive and a second sealing adhesive that are provided between the tab and the packaging bag, where the tab is provided between the first sealing adhesive and the second sealing adhesive, the weak zone is formed through thermal fusion of the second sealing adhesive and the packaging bag, and a thickness of the first sealing adhesive or the second sealing adhesive is greater than 25 µm. According to some embodiments of this application, the first sealing adhesive includes a first adhesive layer and a second adhesive layer, where the first adhesive layer is provided between the second adhesive layer and the packaging bag, the second adhesive layer is provided between the first adhesive layer and the tab, and in a predetermined temperature range, a packaging tension between the first adhesive layer and the packaging bag or the second adhesive layer is less than packaging tension between the second adhesive layer and the tab. According to some embodiments of this application, the first sealing adhesive includes a first adhesive layer and a second adhesive layer, where the first adhesive layer is provided between the second adhesive layer and the tab, the second adhesive layer is provided between the first adhesive layer and the packaging bag, and in a predetermined temperature range, a packaging tension between the first adhesive layer and the tab or the second adhesive layer is less than a packaging tension between the second adhesive layer and the packaging bag. According to some embodiments of this application, a total thickness of the first adhesive layer and the second adhesive layer is greater than or equal to 25 µm, and less than or equal to 100 µm, and a thickness of the first adhesive layer or the second adhesive layer is greater than 10 µm. According to some embodiments of this application, the first sealing adhesive includes a first adhesive layer, a second adhesive layer, and a third adhesive layer that are arranged in sequence, where the first adhesive layer is provided between the second adhesive layer and the packaging bag, the third adhesive layer is provided between the second adhesive layer and the tab, and in a predetermined temperature range, a packaging tension between the first adhesive layer and the packaging bag is less than a packaging tension between the second adhesive layer and the first adhesive layer or the third adhesive layer, and a packaging tension between the third adhesive layer and the tab is less than a packaging tension between the second adhesive layer and the first adhesive layer or the third adhesive layer. According to some embodiments of this application, a total thickness of the first adhesive layer, the second adhesive layer, and the third adhesive layer is greater than or equal to 25 µm and less than or equal to 100 µm, and a thickness of the first adhesive layer, the second adhesive layer, or the third adhesive layer is greater than 10 µm. According to some embodiments of this application, the weak zone is provided in the sealing zone in a location other than where the tab protrudes out. Embodiments of this a