Patent Application
20240243451
The present application relates to the technical field of cells, for example, a cell.
As a main power source of an electric vehicle, a cell of a battery has become one of the key components of the electric vehicle. In the cell, a plastic insulator is generally used for isolating a top cover from a post, thereby avoiding the conduction between the top cover and the post. The insulator includes an upper insulating plastic outside the cell and a lower insulating plastic inside the cell. The lower insulating plastic is provided with the post and other components. A tab drawn from a pole core needs to be welded to the post. To avoid a short circuit caused by the pole core inside the cell touching the post on the lower insulating plastic, a holder is disposed on the lower insulating plastic to isolate the pole core from the post and avoid the instability of the internal structure of the cell due to the excessively large assembly space of the lower insulating plastic inside the cell.
In the cell in the related art, when the holder is assembled, the holder often directly covers the lower insulating plastic, and at the same time, the interference between the holder and the bent tab should be avoided. The assembly is thus complex. Moreover, the assembly tends to be improper, and the holder is connected unstably, making the internal structure of the cell unstable and making the pole core prone to shake, resulting in the reduction of the stability of the cell. Therefore, the safety performance of the cell cannot be guaranteed.
The present application provides a cell.
The cell includes an internal fixed structure of the cell, a pole core, a housing, and a top cover. The internal fixed structure of the cell includes a lower insulating plastic and a holder mounted on the lower insulating plastic. The lower insulating plastic is provided with an abutting surface. The abutting surface abuts against the pole core. The pole core is disposed in the housing and connected to a tab. The top cover is provided with a terminal. The top cover is connected to an end of the housing. The top cover is connected to the lower insulating plastic of the internal fixed structure of the cell. The abutting surface of the lower insulating plastic and the housing each abut against an outer wall of the pole core.
In the description of the present application, terms “joined”, “connected” and “secured” are to be understood in a broad sense unless otherwise expressly specified and limited. For example, the term “connected” may refer to “securely connected”, “detachably connected” or “integrated”, may refer to “mechanically connected” or “electrically connected” or may refer to “connected directly”, “connected indirectly through an intermediary” or “connected inside two components” or “interaction relations between two components”. For those of ordinary skill in the art, meanings of the preceding terms in the present application may be construed according to circumstances.
In the present application, unless otherwise expressly specified and limited, when a first feature is described as “on” or “below” a second feature, the first feature and the second feature may be in direct contact or be in contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is described as “on”, “above” or “over” the second feature, the first feature is right on, above or over the second feature or the first feature is obliquely on, above or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as “under”, “below”, or “underneath” the second feature, the first feature is right under, below, or underneath the second feature or the first feature is obliquely under, below, or underneath the second feature, or the first feature is simply at a lower level than the second feature.
In the description of the present application, it should be noted that orientations or position relations indicated by terms such as “above”, “below”, “right” and the like are based on orientations or position relations shown in the drawings. These orientations or position relations are intended only to facilitate and simplify the operation, and not to indicate or imply that a device or element referred to must have such orientations or must be configured or operated in such orientations. Thus, these orientations or position relations are not to be construed as limiting the present application. In addition, the terms “first” and “second” are used only to distinguish between descriptions and have no special meaning.
Technical solutions of the present application are described below through embodiments in conjunction with
As shown in
As shown in
In this embodiment, the housing 8 is made of aluminum. The housing 8 made of aluminum or aluminum alloy has many advantages, such as high capacity, light weight, high specific energy, high safety, and flexible production design.
As shown in
In an embodiment, the orientation of the side push opening 411 and the length direction of the side push chute 41 are parallel to the thickness direction of the cell so that the side push of the holder 2 is smooth and more convenient.
As shown in
As shown in
The holder 2 is securely mounted on the lower insulating plastic 1 by a side push, and the first side push connecting portion 3 slides into a first chute through the side push opening 411. At the same time, the slider 31 enters the corner missing structure 42, an outer wall of the slider 31 abuts against the inner wall of the corner missing structure 42, and the snap block 311 is snap-fitted in the snap slot 421, so as to complete the installation and fixation of the holder 2. The side push installation manner makes the installation of the holder 2 very convenient. The side push direction is along the thickness direction of the cell, and the holder 2 does not interfere with the tab 5 so that the internal structure of the cell is stable, thereby avoiding the pole core 9 from shaking and improving the stability of the cell and the safety performance of the cell.
As shown in
The tab 5 is provided with an empty slot 521 on the bend 52, and a weak overcurrent region is formed at an edge of the empty slot 521 of the tab 5. An overcurrent sectional area of the tab 5 is not greater than 15 mm2, and the weak overcurrent region acts as a protection device. When the current is too large, this region automatically fuses so as to protect the cell. A protrusion 21 is disposed on a side of the holder 2 facing the lower insulating plastic 1, and when the holder 2 is inserted between the first connecting portion 51 and the bend 52, the protrusion 21 can be inserted into the empty slot 521. The holder 2 plays a role of fixing the tab 5 through the protrusion 21. The holder 2 isolates the tab 5 from the pole core 9 and prevents the following: When the tab 5 acts as an external short-circuit protection device, the pole core 9 is damaged and a safety accident is caused. In other embodiments, multiple empty slots 521 may be provided, multiple protrusions 21 may be provided correspondingly, and the empty slots 521 are in a one-to-one correspondence with the protrusions 21.
The structural design of the internal fixed structure of the cell is not limited to the type of the battery, nor is it limited to whether battery terminals 7 are on the same side or different sides, and one or two internal fixed structures of the cell are provided. In this embodiment, as shown in
In another embodiment, one internal fixed structure of the cell may be provided, the tab 5 includes the positive tab and the negative tab that are disposed on the same side of the cell, positive and negative terminals 7 of the cell are on the same side of the cell, and the abutting surface 11 of the lower insulating plastic 1 mates with the housing 8 so as to abut the pole core 9 in the middle so that the pole core 9 is fixed and prevented from being displaced.
When the positive and negative terminals of the cell are on the same side, one internal fixed structure of the cell is provided, and the abutting surface 11 of the lower insulating plastic 1 mates with the housing 8 so as to abut the pole core 9 in the middle so that the pole core 9 is fixed and prevented from being displaced. When the positive and negative terminals of the cell are on the different sides, two internal fixed structures of the cell are provided correspondingly, and the abutting surface 11 of the lower insulating plastic 1 mates with the abutting surface 11 of the lower insulating plastic 1 on a different side so as to abut the pole core 9 in the middle so that the pole core 9 is fixed, thereby improving the stability of the cell and the safety performance of the cell.
In this embodiment, the overcurrent area of the tab 5 required per unit of the length of the cell is S, the width of the tab 5 is W, the number of layers of the tab 5 is N, where S=W×N; the length of the cell is L, and the ratio of the overcurrent area S of the tab 5 to the length L of the cell is 2 to 25, such as 2, 6, 10, 20 and 25; and the length of the pole core 9 is 1, and the ratio of the length 1 of the pole core 9 to the length L of the cell is 0.93 to 0.99, such as 0.93, 0.95, 0.97, 0.98 and 0.99.
An implementation principle of the cell in this embodiment is described as follows: The internal fixed structure of the cell is provided, the holder 2 is mounted on the lower insulating plastic 1 by a side push, the abutting surface 11 of the lower insulating plastic 1 abuts against the pole core 9, and the pole core 9 mates with the housing 8 or the lower insulating plastic 1 on a different side so that the pole core 9 is fixed and prevented from being displaced; after the lower insulating plastic 1 is assembled, the holder 2 enters the lower plastic by a side push, the tab 5 is isolated from the pole core 9, the protrusion 21 on an upper surface of the holder 2 passes through the empty slot 521 in the weak overcurrent region of the tab 5 and plays a fixing role, and the following can be prevented: when the tab 5 acts as an external short-circuit protection device, the pole core 9 is damaged and a safety accident is caused.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202210691303.7 | Jun 2022 | CN | national |
This is a national stage application filed under 35 U.S.C. 371 based on International Patent Application No. PCT/CN2022/104268, filed Jul. 7, 2022, which claims priority to Chinese Patent Application No. 202210691303.7 filed Jun. 17, 2022, the disclosures of which are incorporated herein by reference in their entireties.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/104268 | 7/7/2022 | WO |
