Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. Wherein the battery cell comprises a shell, one side of which is provided with a pair of pole columns; the N pole groups are arranged in the shell in series and are superposed in the thickness direction of the shell to form a battery cell body, and N is an odd number greater than 1; each pole group is respectively provided with a positive tab and a negative tab along the length direction of the pole group; the connecting sheets are arranged on the battery cell body; the positive tabs and the negative tabs are alternately arranged from the first side to the second side along the thickness direction of the battery cell body; wherein one connecting piece is connected with the positive pole lug of the first pole group and the corresponding pole column, and the other connecting piece is connected with the negative pole lug of the Nth pole group and the corresponding pole column; and the negative tabs of the first pole group to the (N-1) th pole group are sequentially connected with the positive tabs of the second pole group to the Nth pole group in pairs. According to the utility model, the N pole groups are connected in series, so that the voltage class of the battery cell can be effectively improved, and the voltage class of the battery pack can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to an electric core and a battery pack. Background Art

[0002] With the development of new energy vehicles, the voltage level on new energy vehicles has gradually become higher. However, due to the limited space for installing the battery pack in the hybrid models of new energy vehicles, the solution of increasing the voltage level of the battery pack by increasing the number of electric cores cannot be adopted. Summary of the Utility Model

[0003] In view of this, the utility model provides an electric core and a battery pack to solve the problem that the voltage level of the battery pack cannot be increased by stacking the number of electric cores in a limited installation space.

[0004] In a first aspect, the utility model provides an electric core, comprising:

[0005] A housing with a pair of pole columns provided on one side;

[0006] N pole groups, which are connected in series and stacked along the thickness direction of the housing to form an electric core body, where N is an odd number greater than 1; each of the pole groups is respectively provided with a positive electrode tab and a negative electrode tab along its length direction;

[0007] A pair of connecting pieces, which are arranged on the electric core body; along the thickness direction of the electric core body from the first side to the second side, the positive electrode tab and the negative electrode tab are alternately arranged; one of the connecting pieces is connected to the positive electrode tab of the first pole group and the corresponding pole column, and the other connecting piece is connected to the negative electrode tab of the Nth pole group and the corresponding pole column; the negative electrode tabs of the first to the (N - 1)th pole groups are sequentially connected in pairs to the positive electrode tabs of the second to the Nth pole groups.

[0008] Beneficial effects: By arranging a plurality of pole groups inside the housing and connecting the plurality of pole groups in series, the present utility model can form a battery cell body with a relatively high voltage level, achieving the purpose of increasing the voltage level of a single battery cell itself. Further, by stacking the plurality of pole groups along their thickness direction, on the one hand, it is convenient to connect the positive electrode tabs and negative electrode tabs of adjacent pole groups in series, and on the other hand, the size in the width direction of the battery cell can be reduced, ensuring the compactness of the structure. Secondly, since a pair of pole tabs on the existing battery cell are usually arranged at intervals along the length direction of the battery cell, the number of pole groups inside the housing is limited to an odd number, so that the positive electrode tab of the first pole group and the negative electrode tab of the Nth pole group are arranged at intervals along the length direction of the battery cell body. In this way, the positive electrode tab of the first pole group and the negative electrode tab of the Nth pole group will correspond to the positions of a pair of pole posts, thereby simplifying the structure of the connecting piece in the state of connecting the pole posts and pole tabs and improving the convenience of assembly. In addition, since the structure of the connecting piece is simplified, the connecting piece will not occupy too much internal space of the housing. In this way, the utilization rate of the internal space of the housing is improved, and the battery cell stores more energy under the same volume.

[0009] In an optional embodiment, one of the connecting piece and the pole post is provided with a positioning hole, and the other is provided with a positioning post matching the positioning hole, and the connecting piece and the pole post are fixedly connected by inserting the positioning post into the positioning hole.

[0010] Beneficial effects: By inserting the positioning post into the positioning hole during the assembly process, the present utility model enables the operator to quickly and accurately position the relative positions of the connecting piece and the pole post, reducing the time consumed during the assembly process and improving the production efficiency of the subsequent battery cell; secondly, after the positioning post is inserted into the positioning hole, the relative positional relationship between the connecting piece and the pole post will be locked, improving the connection stability between the connecting piece and the pole post during the assembly process and reducing the possibility of relative displacement between the two due to vibration or external force.

[0011] In an optional embodiment, the connecting piece includes a connecting body and a bent portion bent from the end of the connecting body toward one side. One of the connecting bodies is used to connect the positive electrode tab of the first pole group to the corresponding pole post, and the other connecting body is used to connect the negative electrode tab of the Nth pole group to the corresponding pole post; a pair of the bent portions are located on opposite sides in the thickness direction of the battery cell body and are attached to the side walls of the battery cell body.

[0012] Beneficial effects: The present utility model connects the positive tab of the first electrode group to the corresponding terminal post and the negative tab of the Nth electrode group to the corresponding terminal post through different connecting bodies, enabling smooth current flow between a pair of terminal posts, thereby smoothly introducing or extracting current from the battery cell body to complete the charging or discharging operation of the battery cell. In addition, since the battery cell body includes multiple electrode groups arranged side by side in the width direction of the housing, if only the connection between the positive tabs and negative tabs of adjacent electrode groups is used, it may not be possible to ensure the integrity of multiple electrode groups during the use of the battery cell. Therefore, to improve the stability and safety of the battery cell, the present utility model arranges a pair of bent portions on opposite sides in the thickness direction of the battery cell body, initially forming a space for restricting multiple electrode groups, reducing the possibility of relative displacement between multiple electrode groups. Subsequently, the bent portions are attached to the side walls of the battery cell body, further enhancing the limiting effect of the pair of bent portions on multiple electrode groups.

[0013] In an alternative embodiment, one of the connecting body and the terminal post is provided with a positioning hole, and the other is provided with a positioning post that cooperates with the positioning hole. The connecting body and the terminal post are fixedly connected by inserting the positioning post into the positioning hole.

[0014] Beneficial effects: By inserting the positioning post into the positioning hole during the assembly process, the present utility model allows operators to quickly and accurately position the relative positions of the connecting piece and the terminal post, reducing the time consumed during the assembly process and improving the production efficiency of subsequent battery cells. Secondly, after the positioning post is inserted into the positioning hole, the relative positional relationship between the connecting piece and the terminal post is locked, improving the connection stability between the connecting piece and the terminal post during the assembly process and reducing the possibility of relative displacement between the two due to vibration or external force.

[0015] In an alternative embodiment, the length of the bent portion is greater than the length of the connecting body, and a notch extending along its length direction is provided on the bent portion.

[0016] Beneficial effects: Since a pair of bent portions of the connecting pieces are located on opposite sides of the battery cell body, to improve the limiting effect of the pair of bent portions on multiple electrode groups, making the length of the bent portion greater than the length of the connecting body can effectively increase the contact area between the bent portion and the side wall of the battery cell body, increase the area of the space defined by the pair of bent portions, and enhance the limiting effect of the pair of bent portions on multiple electrode groups. In addition, as the size of the bent portion itself increases, the self-weight of the connecting piece will also increase. Therefore, to reduce the impact of the connecting piece on the overall weight of the battery cell and ensure that the battery cell of the present utility model meets the requirements of lightweight, by providing a notch on the bent portion, the weight of the bent portion can be reduced without affecting its own structural strength.

[0017] In an alternative embodiment, notches are provided on opposite sides of the bending portion of the connecting body at the bending location.

[0018] Advantageous effects: Since the bending portion is in the same plane as the connecting body before bending towards the connecting body side, and then to adapt to the shape of the electrode group, the bending portion needs to be bent to ensure the fitting degree between the bending portion and the side wall of the battery cell body. Therefore, to reduce the structural strength at the bending location of the connecting body and the bending portion and improve the convenience of bending, by providing non-connected notches on opposite sides of the bending location, it is possible to ensure a certain strength at the bending location of the connecting body and the bending portion while allowing the operator to quickly complete the operation of bending the bending portion towards the connecting body side without much effort.

[0019] In an alternative embodiment, the housing is provided with an opening communicating with its interior and a battery cell cover plate for sealing the opening, and a pair of the pole columns are arranged on the battery cell cover plate.

[0020] Advantageous effects: By providing an opening communicating with the interior on the housing in the present utility model, it is convenient for the operator to assemble relevant structures such as the electrode group into the housing, improving the convenience of assembly. Further, using the battery cell cover plate to seal the opening ensures the sealing of the battery cell, reduces the possibility of external moisture, dust and other impurities entering the interior of the battery cell, ensures the cleanliness and stability of the interior environment of the battery cell, and thus is beneficial to extending the service life of the battery cell. In addition, arranging the pole columns on the battery cell cover plate allows the pole columns to be assembled onto the housing together with the battery cell cover plate, improving the convenience of assembly and subsequent disassembly.

[0021] In an alternative embodiment, a liquid injection hole and an explosion-proof valve are further provided on the battery cell cover plate, and the liquid injection hole and the explosion-proof valve are located between a pair of the pole columns.

[0022] Advantageous effects: In the present utility model, the liquid injection hole and the explosion-proof valve are arranged on the battery cell cover plate and are located between a pair of the pole columns. On the one hand, it can make the self-structure of the battery cell cover plate more compact and optimize the structural layout on the battery cell cover plate. On the other hand, it is convenient to add electrolyte into the battery cell, and at the same time, it can prevent the pressure inside the battery cell from being too high, improving the use safety of the battery cell.

[0023] In an alternative embodiment, the negative electrode tabs of the 1st to the (N - 1)th electrode groups are sequentially welded to the positive electrode tabs of the 2nd to the Nth electrode groups.

[0024] Beneficial effects: In the present utility model, the positive tab and the negative tab of the series-connected electrode group are connected by welding. On the one hand, the connection strength between the two can be ensured, avoiding the possibility of breakage at the connection during the use of the battery cell. On the other hand, the welding method is used for connection, which can increase the connection area between the positive tab and the negative tab, reduce the resistance at the connection between the two, optimize the current conduction path, and improve the performance of the battery cell during charging and discharging.

[0025] In the second aspect, the present utility model also provides a battery pack, comprising: a plurality of the above-mentioned battery cells.

[0026] Beneficial effects: Since the battery pack in the present utility model adopts the above-mentioned battery cell, it can improve its voltage level without increasing the occupied space, thus meeting the demand for a high voltage level of the battery pack in the hybrid vehicle of new energy vehicles. In addition, the battery pack of the present utility model has all the advantages of the above-mentioned battery cell, which will not be elaborated here. Description of the Drawings

[0027] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

[0029] Figure 2 It is a top view schematic diagram of a battery cell without assembling the battery cell cover according to an embodiment of the present utility model.

[0030] Description of the reference numerals:

[0031] 1. Housing; 101. Terminal; 1011. Positioning post; 2. Electrode group; 201. Positive tab; 202. Negative tab; 3. Battery cell body; 301. First side; 302. Second side; 4. Connecting piece; 401. Connecting body; 4011. Positioning hole; 402. Bending part; 4021. Notch; 5. Battery cell cover; 6. Liquid injection hole; 7. Explosion-proof valve. Specific embodiments

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present utility model.

[0033] Aiming at the problem that the voltage level of the battery pack cannot be increased by stacking the number of battery cells in a limited installation space, the present utility model provides a battery cell and a battery pack.

[0034] The following combines Figures 1 to 2 , and describes the embodiments of the present utility model.

[0035] According to the embodiments of the present utility model, on the one hand, as Figures 1 to 2 shown, a battery cell is provided, including: a housing 1, N pole groups 2, and a pair of connecting pieces 4.

[0036] Specifically, a pair of pole posts 101 are provided on one side of the housing 1; N pole groups 2 are connected in series in the housing 1 and stacked along its thickness direction to form a battery cell body 3, where N is an odd number greater than 1; each pole group 2 is respectively provided with a positive electrode tab 201 and a negative electrode tab 202 along its length direction; a pair of connecting pieces 4 are provided on the battery cell body 3; along the thickness direction of the battery cell body 3 from the first side 301 to the second side 302, the positive electrode tab 201 and the negative electrode tab 202 are alternately arranged; one of the connecting pieces 4 is connected to the positive electrode tab 201 of the first pole group 2 and the corresponding pole post 101, and the other connecting piece 4 is connected to the negative electrode tab 202 of the Nth pole group 2 and the corresponding pole post 101; the negative electrode tabs 202 of the first to the (N - 1)th pole groups 2 are sequentially connected in pairs to the positive electrode tabs 201 of the second to the Nth pole groups 2.

[0037] In this embodiment, by arranging a plurality of pole groups 2 in the housing 1 and connecting the plurality of pole groups 2 in series, a battery cell body 3 with a relatively high voltage level can be formed, achieving the purpose of increasing the voltage level of a single battery cell. Further, by stacking the plurality of pole groups 2 along their thickness directions, on the one hand, it is convenient to connect the positive tabs 201 and negative tabs 202 of adjacent pole groups 2 in series, and on the other hand, the size in the width direction of the battery cell can be reduced, ensuring the compactness of the structure. Secondly, since a pair of tabs on an existing battery cell are usually arranged at intervals along the length direction of the battery cell, the number of pole groups 2 inside the housing 1 is limited to an odd number, so that the positive tab 201 of the first pole group 2 and the negative tab 202 of the Nth pole group 2 are arranged at intervals along the length direction of the battery cell body 3. In this way, the positive tab 201 of the first pole group 2 and the negative tab 202 of the Nth pole group 2 will correspond to the positions of a pair of pole posts 101, thereby simplifying the structure of the connecting piece 4 in the state of connecting the pole posts 101 and the tabs and improving the convenience of assembly. In addition, since the structure of the connecting piece 4 is simplified, the connecting piece 4 does not occupy too much internal space of the housing 1. In this way, the utilization rate of the internal space of the housing 1 is increased, and the battery cell stores more energy under the same volume.

[0038] It should be noted that in this embodiment, the thickness direction of the pole group 2 is consistent with the width direction of the battery cell. Among them, the width direction and the length direction of the battery cell are consistent with the Figure 1 directions shown in.

[0039] According to an embodiment of the present invention, as Figures 1 to 2 shown, one of the connecting piece 4 and the pole post 101 is provided with a positioning hole 4011, and the other is provided with a positioning post 1011 that cooperates with the positioning hole 4011. The connecting piece 4 and the pole post 101 are fixedly connected by inserting the positioning post 1011 into the positioning hole 4011. In this embodiment, by inserting the positioning post 1011 into the positioning hole 4011 during the assembly process, the operator can quickly and accurately position the relative positions of the connecting piece 4 and the pole post 101, reducing the time consumed during the assembly process and improving the production efficiency of subsequent battery cells; secondly, after the positioning post 1011 is inserted into the positioning hole 4011, the relative positional relationship between the connecting piece 4 and the pole post 101 will be locked, improving the connection stability between the connecting piece 4 and the pole post 101 during the assembly process and reducing the possibility of relative displacement between the two due to vibration or external force.

[0040] According to an embodiment of the present invention, as Figures 1 to 2As shown, the connecting piece 4 includes a connecting body 401 and a bending part 402 bent from the end of the connecting body 401 towards one side. One connecting body 401 is used to connect the positive electrode tab 201 of the first electrode group 2 to the corresponding electrode post 101, and the other connecting body 401 is used to connect the negative electrode tab 202 of the Nth electrode group 2 to the corresponding electrode post 101; a pair of bending parts 402 are located on the opposite sides in the thickness direction of the battery cell body 3 and are attached to the side wall of the battery cell body 3. In this embodiment, the positive electrode tab 201 of the first electrode group 2 is connected to the corresponding electrode post 101 and the negative electrode tab 202 of the Nth electrode group 2 is connected to the corresponding electrode post 101 through different connecting bodies 401, which can enable the current to flow smoothly between a pair of electrode posts 101, so that the current can be introduced into or drawn out of the battery cell body 3 smoothly, and the charging or discharging operation of the battery cell can be completed. In addition, since the battery cell body 3 includes a plurality of electrode groups 2 arranged side by side in the width direction of the housing 1, if only the connection between the positive electrode tab 201 and the negative electrode tab 202 between adjacent electrode groups 2 is used, the integrity of the plurality of electrode groups 2 during the use of the battery cell may not be guaranteed. Therefore, to improve the stability and safety of the battery cell, in this embodiment, a pair of bending parts 402 are located on the opposite sides in the thickness direction of the battery cell body 3, which can initially form a space for limiting the plurality of electrode groups 2 and reduce the possibility of relative displacement between the plurality of electrode groups 2. Then, the bending parts 402 are attached to the side wall of the battery cell body 3, further improving the limiting effect of the pair of bending parts 402 on the plurality of electrode groups 2.

[0041] According to an embodiment of the present invention, the negative electrode tabs 202 of the first electrode group 2 to the (N - 1)th electrode group 2 are sequentially welded to the positive electrode tabs 201 of the second to the Nth electrode groups 2. In this embodiment, the positive electrode tabs 201 and the negative electrode tabs 202 of the series-connected electrode groups 2 are connected by welding. On the one hand, the connection strength between the two can be ensured, and the possibility of breakage at the connection during the use of the battery cell can be avoided; on the other hand, the welding method is used for connection, which can increase the connection area between the positive electrode tab 201 and the negative electrode tab 202, reduce the resistance at the connection between the two, optimize the current conduction path, and improve the performance of the battery cell during charging and discharging.

[0042] It should be noted that the welding method in this embodiment can be laser welding or ultrasonic welding.

[0043] According to an embodiment of the present utility model, one of the connection body 401 and the pole column 101 is provided with a positioning hole 4011, and the other is provided with a positioning post 1011 that cooperates with the positioning hole 4011. The connection body 401 and the pole column 101 are fixedly connected by inserting the positioning post 1011 into the positioning hole 4011. In this embodiment, by inserting the positioning post 1011 into the positioning hole 4011 during the assembly process, the operator can quickly and accurately position the relative position of the connecting piece 4 and the pole column 101, reducing the time consumed during the assembly process and improving the production efficiency of the subsequent battery cells. Secondly, after the positioning post 1011 is inserted into the positioning hole 4011, the relative positional relationship between the connecting piece 4 and the pole column 101 will be locked, improving the connection stability between the connecting piece 4 and the pole column 101 during the assembly process and reducing the possibility of relative displacement between the two due to vibration or external force.

[0044] It can be understood that the number of the positioning holes 4011 and the positioning posts 1011 can be one, two or three, as long as the effect of improving the assembly convenience can be achieved through the cooperation of the positioning holes 4011 and the positioning posts 1011. In this regard, the present utility model does not make specific limitations. In a specific embodiment, as Figures 1 to 2 shown, the connection body 401 is provided with two positioning holes 4011, and one end of the pole column 101 facing the connection body 401 is provided with two positioning posts 1011 adapted to the positioning holes 4011.

[0045] It should be noted that the positioning hole 4011 and the positioning post 1011 in this embodiment can be connected by welding.

[0046] According to an embodiment of the present utility model, as Figures 1 to 2 shown, the length of the bent portion 402 is greater than the length of the connection body 401, and a notch 4021 extending along its length direction is provided on the bent portion 402. Since the bent portions 402 of a pair of connecting pieces 4 are located on opposite sides of the battery cell body 3, in order to improve the limiting effect of a pair of bent portions 402 on multiple pole groups 2, making the length of the bent portion 402 greater than the length of the connection body 401 can effectively increase the contact area between the bent portion 402 and the side wall of the battery cell body 3, increase the area of the space defined by a pair of bent portions 402, and enhance the limiting effect of a pair of bent portions 402 on multiple pole groups 2. In addition, as the size of the bent portion 402 itself increases, the self-weight of the connecting piece 4 will also increase accordingly. Therefore, in order to reduce the influence of the connecting piece 4 on the overall weight of the battery cell and ensure that the battery cell in this embodiment meets the requirements of light weight, by providing a notch 4021 on the bent portion 402, the weight of the bent portion 402 can be reduced, and at the same time, its own structural strength will not be affected.

[0047] According to an embodiment of the present utility model, as Figures 1 to 2As shown, notches 4021 are provided on opposite sides of the bend where the connecting body 401 is connected to the bent portion 402. Since the bent portion 402 is in the same plane as the connecting body 401 before being bent towards the connecting body 401, and then to match the shape of the electrode group 2, the bent portion 402 needs to be bent to ensure the degree of fit between the bent portion 402 and the side wall of the battery cell body 3. Therefore, to reduce the structural strength of the bend between the connecting body 401 and the bent portion 402 and improve the convenience of bending, by providing non-connected notches 4021 on opposite sides of the bend, it is possible to ensure a certain strength at the bend between the connecting body 401 and the bent portion 402 while allowing the operator to quickly and effortlessly complete the operation of bending the bent portion 402 towards the connecting body 401.

[0048] According to an embodiment of the present invention, as shown in the figure, the housing 1 is provided with an opening communicating with its interior and a battery cell cover plate 5 for sealing the opening. A pair of pole columns 101 are provided on the battery cell cover plate 5. In this embodiment, by providing an opening communicating with the interior of the housing 1, it is convenient for the operator to assemble structures such as the electrode group 2 into the housing 1, improving the convenience of assembly. Further, using the battery cell cover plate 5 to seal the opening ensures the sealing of the battery cell, reduces the possibility of external moisture, dust and other impurities entering the interior of the battery cell, ensures the cleanliness and stability of the interior environment of the battery cell, and thus is beneficial to extending the service life of the battery cell. In addition, by arranging the pole columns 101 on the battery cell cover plate 5, the pole columns 101 can be assembled onto the housing 1 together with the battery cell cover plate 5, improving the convenience of assembly and subsequent disassembly.

[0049] According to an embodiment of the present invention, as Figure 1 shown, the battery cell cover plate 5 is further provided with a liquid injection hole 6 and an explosion-proof valve 7, and the liquid injection hole 6 and the explosion-proof valve 7 are located between a pair of pole columns 101. In this embodiment, the liquid injection hole 6 and the explosion-proof valve 7 are arranged on the battery cell cover plate 5 and are located between a pair of pole columns 101. On the one hand, it can make the self-structure of the battery cell cover plate 5 more compact and optimize the structural layout on the battery cell cover plate 5; on the other hand, it is convenient to add electrolyte into the battery cell, and at the same time, it can prevent the pressure inside the battery cell from being too high, improving the safety of using the battery cell.

[0050] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including: a plurality of the above-mentioned battery cells.

[0051] It can be understood that since the battery pack in this embodiment uses the above-mentioned battery cells, it is possible to increase the voltage level of itself without increasing the occupied space, so as to meet the requirements of the hybrid vehicle of new energy vehicles for the high voltage level of the battery pack. In addition, the battery pack of the present invention has all the advantages of the above-mentioned battery cells and will not be elaborated here.

[0052] It should be noted that the battery cells in this embodiment can be, but are not limited to, lithium-ion batteries, lithium manganate batteries, and nickel cobalt manganese ternary material batteries. Specifically, taking lithium-ion batteries as an example, the battery pack in this embodiment can be formed by connecting multiple lithium-ion batteries in series, or by connecting multiple lithium-ion batteries in parallel, or by preparing multiple lithium-ion batteries in a combination of series and parallel. Specific adjustments can be made according to the actual application scenarios and requirements. In this regard, the present utility model does not make specific limitations.

[0053] In addition, to achieve the basic functions of the battery pack, the battery pack in this embodiment may further include other necessary modules or components, such as a battery management system, a heat dissipation system, etc. It should be noted that for the other necessary modules or components included in the battery pack, any suitable existing structure can be selected. To clearly and briefly illustrate the technical solutions provided in this embodiment, the above parts will not be elaborated herein, and the accompanying drawings of the specification have also been correspondingly simplified. However, it should be understood that the scope of the present utility model is not limited thereby.

[0054] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing, with a pair of pole columns provided on one side; N pole groups, which are arranged in series in the housing and stacked in the thickness direction thereof to form a battery cell body, where N is an odd number greater than 1; each of the pole groups is respectively provided with a positive tab and a negative tab along its length direction; A pair of connecting pieces, provided on the battery cell body; along the thickness direction of the battery cell body from the first side to the second side, the positive tabs and the negative tabs are alternately arranged; one of the connecting pieces is connected to the positive tab of the 1st pole group and the corresponding pole column, and the other connecting piece is connected to the negative tab of the Nth pole group and the corresponding pole column; the negative tabs of the 1st to the (N - 1)th pole groups are sequentially and pairwise connected to the positive tabs of the 2nd to the Nth pole groups.

2. The battery cell according to claim 1, characterized in that, One of the connecting piece and the pole column is provided with a positioning hole, and the other is provided with a positioning post that cooperates with the positioning hole, and the connecting piece and the pole column are fixedly connected by inserting the positioning post into the positioning hole.

3. The battery cell according to claim 1, wherein, The connecting piece includes a connecting body and a bent portion bent from the end of the connecting body towards one side, where one of the connecting bodies is used to connect the positive tab of the 1st pole group and the corresponding pole column, and the other connecting body is used to connect the negative tab of the Nth pole group and the corresponding pole column; a pair of the bent portions are located on opposite sides in the thickness direction of the battery cell body and are in contact with the side walls of the battery cell body.

4. The cell according to claim 3, wherein, One of the connecting body and the pole column is provided with a positioning hole, and the other is provided with a positioning post that cooperates with the positioning hole, and the connecting body and the pole column are fixedly connected by inserting the positioning post into the positioning hole.

5. The battery cell according to claim 3, characterized in that, The length of the bent portion is greater than the length of the connecting body, and a notch extending along its length direction is provided on the bent portion.

6. The battery cell according to claim 3, characterized in that, Notches are provided on opposite sides of the bending part of the connecting body and the bent portion.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The housing is provided with an opening communicating with its interior and a battery cell cover plate sealing the opening, and a pair of the pole columns are provided on the battery cell cover plate.

8. The battery cell according to claim 7, characterized in that, The battery cell cover plate is further provided with a liquid injection hole and an explosion-proof valve, and the liquid injection hole and the explosion-proof valve are located between a pair of the pole columns.

9. The battery cell according to any one of claims 1 to 6, characterized in that The negative tabs of the 1st to the (N - 1)th pole groups are sequentially welded to the positive tabs of the 2nd to the Nth pole groups.

10. A battery pack, characterized in that, Comprising: A plurality of battery cells according to any one of claims 1 to 9.

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